WO2015076409A1

WO2015076409A1 - Optical member and display device

Info

Publication number: WO2015076409A1
Application number: PCT/JP2014/081067
Authority: WO
Inventors: 修央出口; 康弘羽場
Original assignee: 住友化学株式会社
Priority date: 2013-11-25
Filing date: 2014-11-25
Publication date: 2015-05-28
Also published as: JPWO2015076409A1; CN105874360A; KR20160090285A; TW201527800A

Abstract

　This optical member has: a phase-difference layer (32) that has a plurality of first regions (32a) for changing an incident linearly polarized light to a first polarization state and a plurality of second regions (32b) for making a change to a second polarization state, the first regions (32a) and the second regions (32b) being disposed in a prescribed pattern in plan view; a polarizer layer (2) provided on one side of the phase difference layer (32); and an anti-glare layer provided on the surface of the other side of the phase-difference layer (32). The arithmetic mean height (Pa) of the concavo-convex surface of the anti-glare layer on an arbitrary cross-section curve is 0.15 μm or less, and the maximum cross-section height (Pt) is 1.5 μm or less.

Description

Optical member and display device

The present invention relates to an optical member and a display device.
The present application is filed on November 25, 2013 in Japanese Patent Application Nos. 2013-242898, 2013-242899, 2013-242900, 2013-242901, and 2013-242902. , And the priority based on Japanese Patent Application No. 2013-242903, the contents of which are incorporated herein.

In recent years, a passive 3D (3-dimensional) liquid crystal display device called an FPR (Film Patterned Retarder) system has been developed.

FIG. 5 is a cross-sectional view showing a schematic configuration of a 3D liquid crystal display device. As shown in FIG. 5, in the 3D liquid crystal display device (display device) 100 of this system, for example, the polarizer layer 2 is disposed on the display surface side of the liquid crystal panel P, and the patterned retardation layer 3 is further disposed on the viewing side. Is placed. A polarizing film F11 is disposed on the backlight side of the liquid crystal panel P.

The polarizer layer 2 is a layer having an optical function of absorbing a polarization component of a vibration plane parallel to the absorption axis of the polarizer layer 2 and transmitting a polarization component of a vibration plane orthogonal to the incident light. The transmitted light immediately after passing through is linearly polarized light.

The patterned retardation layer 3 is usually formed on a base film and is called an FPR film together with the base film. The base film is disposed on the viewer side with respect to the patterned retardation layer 3 and functions also as a protective layer for protecting the patterned retardation layer 3.

FIG. 6 is a plan view for explaining alignment between the liquid crystal panel P and the patterned retardation layer 3 in the 3D liquid crystal display device. As shown in FIG. 6, in the liquid crystal panel P, the right-eye image and the left-eye image are alternately displayed for each pixel row L in which pixels are arranged in a line in the left-right direction.

The patterned retardation layer 3 includes a first region 32a and a second region 32b. For example, the first region 32a displays the left-eye image on the viewing side of the pixel row L that displays the right-eye image. The second region 32b is arranged on the viewing side of the pixel row L to be displayed. The first region 32a and the second region 32b have different phase differences, and the right-eye image and the left-eye image are displayed on the viewer side in different polarization states (for example, patents). Reference 1).

The user views the display image through so-called polarizing glasses having optical elements having different optical characteristics between the right-eye lens and the left-eye lens. Then, the images for the left eye are selectively visually recognized. Accordingly, the user can recognize a stereoscopic image obtained by fusing the images of both eyes.

As a member used for such a 3D liquid crystal display device, an optical member in which an FPR film and a polarizer layer are integrated has been proposed (for example, see Patent Document 2).

Japanese Unexamined Patent Publication No. 2012-212033 Korean Patent No. 1191129

An optical member as described in Patent Document 2 may deteriorate the image quality of a stereoscopic display image due to various causes.

The present invention has been made in view of such circumstances, and an object thereof is to provide an optical member capable of displaying a good stereoscopic image. It is another object of the present invention to provide a display device including the above-described optical member and capable of displaying a favorable stereoscopic image.

Specifically, the optical member described in Patent Document 2 may deteriorate the quality of the stereoscopic display image due to the following causes.

First, an optical member as described in Patent Document 2 may form an antiglare layer having an uneven shape on the surface on the viewing side. Thereby, reflection of ambient light on the surface on the viewing side when mounted on the 3D liquid crystal display device can be suppressed, and visibility can be improved.

However, by forming the antiglare layer, image light is slightly scattered in the antiglare layer. When the image light is scattered, the polarization state of the image light from the patterned retardation layer changes. Alternatively, the boundary between the image for the right eye and the image for the left eye cannot be sufficiently distinguished, and for example, the image for the right eye that should originally be recognized only by the right eye is also recognized by the left eye. So-called crosstalk occurs, and there is a risk of deteriorating the image quality of the stereoscopic display image, such as lack of realism and stereoscopic effect.

In addition, an optical member as described in Patent Document 2 may be provided with a protective layer for protecting the polarizing film on the side opposite to the viewing side with respect to the polarizer layer. Such a protective layer is typically formed using a resin film.

However, the resin film used for such a protective layer may have a phase difference. If the protective layer has a retardation, the polarization state of linearly polarized light emitted through the polarizer layer changes, and there is a possibility that polarized light having a polarization state different from the design may enter the patterned retardation layer of the FPR film. is there. Then, the image light emitted from the FPR film does not have a desired polarization state, which affects the color tone, brightness, contrast, and the like, and may deteriorate the image quality of the stereoscopic display image.

Also, the optical member described in Patent Document 2 may form a hard coat layer, which is a relatively hard resin layer, on the surface in order to protect the surface on the viewing side. Such a hard coat layer is typically formed by polymerizing monomers or oligomers on the surface of a base film (protective layer) on the viewing side of the FPR film.

When forming the hard coat layer, it is expected that stress due to curing shrinkage is applied to the FPR film. When the hard coat layer is thick, the effect of protecting the surface is high. However, when the hard coat layer is thick, the shrinkage of curing at the time of formation increases.

Since the retardation of the FPR film is easily changed by stress, the image light emitted from the FPR film is not in a desired polarization state by forming the hard coat layer. For example, a right-eye image that should originally be recognized only by the right eye is also recognized by the left eye. So-called crosstalk may occur, and the image quality of the stereoscopic display image may be reduced.

In addition, since the optical member as described in Patent Document 2 is formed by laminating a plurality of layers, the overall thickness tends to be thick. In the display device, the image light for the right eye emitted from the pixels enters the corresponding area in the FPR film, and is emitted as polarized image light for the right eye, and the image for the left eye is emitted in the FPR film. By entering the corresponding area, it is emitted as polarized image light for the left eye.

However, when the optical member becomes thick, there is a possibility that image light emitted obliquely upward or obliquely downward from the pixel may enter a region different from the region that should originally be incident on the FPR film. In this case, the image light emitted obliquely may cause a so-called crosstalk in which an image for the right eye that should be recognized only by the right eye, for example, is recognized by the left eye, and may reduce the image quality of the stereoscopic display image. is there. This fear is particularly noticeable when the image is looked down obliquely from above at an angle of 30 degrees or more with respect to the horizontal plane, or when the image is looked up obliquely from below at an angle of 30 degrees or more.

Also, the optical member described in Patent Document 2 may form a hard coat layer, which is a relatively hard resin layer, on the surface in order to protect the surface on the viewing side. Such a hard coat layer is typically formed by polymerizing monomers or oligomers on the surface of a base film (protective layer) on the FPR film viewing side.

The present invention employs the following means.
A first aspect of the present invention includes a plurality of first regions that change incident linearly polarized light into a first polarization state, and a plurality of second regions that change into a second polarization state. A retardation layer in which the first region and the plurality of second regions are arranged in a predetermined pattern in plan view, a polarizer layer provided on one surface side of the retardation layer, and the other of the retardation layer An anti-glare layer provided on the surface of the anti-glare layer, the arithmetic average height Pa in an arbitrary cross-sectional curve of the uneven surface of the anti-glare layer is 0.15 μm or less, and the maximum cross-sectional height Pt is An optical member having a size of 1.5 μm or less is provided.

In one embodiment of the present invention, the ratio of the inclination angle of the surface of the antiglare layer being 2 ° or more may be 30% or less.

The second aspect of the present invention includes a plurality of first regions that change the incident linearly polarized light into the first polarization state, and a plurality of second regions that change into the second polarization state. A retardation layer in which the first region and the plurality of second regions are arranged in a predetermined pattern in plan view, a polarizer layer provided on one surface side of the retardation layer, and the retardation layer An antiglare layer provided on the surface of the other surface of the optical disc, and the surface of the antiglare layer is an optical comb having widths of 0.5 mm, 1.0 mm and 2.0 mm based on JIS K 7374. An optical member having a sum of image sharpness measured by a reflection method of 30% or more and 200% or less is provided.

In one aspect of the present invention, the light transmitted from the polarizer layer side is transmitted using an optical comb having a width of 0.125 mm, 0.5 mm, 1.0 mm, and 2.0 mm based on JIS K 7374. The sum of the measured image sharpnesses may be 150% or more and 350% or less.

The third aspect of the present invention has a plurality of first regions that change the incident linearly polarized light into the first polarization state and a plurality of second regions that change into the second polarization state. A retardation layer in which the first region and the plurality of second regions are arranged in a predetermined pattern in plan view, a polarizer layer provided on one surface side of the retardation layer, and the polarizer layer anda polarizer protecting layer provided on the side opposite to the retardation layer to the in-plane retardation R _o of the polarizer layer protective layer, provides an optical member is 10nm or less.

In one embodiment of the present invention, a thickness direction retardation _{Rth of the} polarizer layer protective layer may be 10 nm or less.

In one embodiment of the present invention, the polarizer layer protective layer may have an Nz coefficient of 10 or less.

Moreover, the 4th aspect of this invention has several 1st area | region which changes the incident linearly polarized light into a 1st polarization state, and several 2nd area | region which changes to 2nd polarization state, A retardation layer in which the first region and the plurality of second regions are arranged in a predetermined pattern in plan view, a polarizer layer provided on one surface side of the retardation layer, and the retardation layer A hard coat layer provided on the surface on the other surface side, wherein the hard coat layer has an thickness of 1 μm or more and a pencil hardness of F to 2H.

In one aspect of the present invention, the hard coat layer may be a polymer of an active energy ray-curable resin composition.

In one embodiment of the present invention, a retardation layer protective layer may be provided between the retardation layer and the hard coat layer.

Moreover, the 5th aspect of this invention has several 1st area | region which changes the incident linearly polarized light into a 1st polarization state, and several 2nd area | region which changes to 2nd polarization state, A retardation layer in which the first region and the plurality of second regions are arranged in a predetermined pattern in plan view, a polarizer layer provided on one surface side of the retardation layer, and the polarizer layer A polarizer layer protective layer provided on the opposite side of the retardation layer, and the polarizer layer protective layer provides an optical member having a thickness of 5 μm to 80 μm.

The sixth aspect of the present invention includes a plurality of first regions that change the incident linearly polarized light to the first polarization state, and a plurality of second regions that change the second polarization state. A retardation layer in which the first region and the plurality of second regions are arranged in a predetermined pattern in plan view, a polarizer layer provided on one surface side of the retardation layer, and the retardation layer A hard coat layer provided on the surface of the other surface side, and a retardation layer protective layer provided between the retardation layer and the hard coat layer, wherein the retardation layer protective layer is An optical member having a thickness of 35 μm or more is provided.

Another embodiment of the present invention provides a display device having a display panel and the optical member provided on the display surface side of the display panel.

According to each aspect of the present invention, an optical member capable of displaying a favorable stereoscopic image can be provided. In addition, it is possible to provide a display device that includes the above-described optical member and can display a favorable stereoscopic image.

It is a schematic sectional drawing which shows the optical member of this embodiment. It is a schematic enlarged view of the surface of the hard-coat layer 5 of the optical member 1 of this embodiment. It is a schematic diagram for demonstrating the measuring method of the inclination angle of the glare-proof layer surface. It is a top view which shows schematic structure of the display apparatus of this embodiment. It is sectional drawing which shows schematic structure of the display apparatus of this embodiment. It is a top view for demonstrating position alignment at the time of bonding with liquid crystal panel P and the optical member 1. FIG.

[Optical member]
Hereinafter, an optical member according to an embodiment of the present invention will be described with reference to the drawings. In all the drawings below, the dimensions and ratios of the constituent elements are appropriately changed in order to make the drawings easy to see.

FIG. 1 is a schematic cross-sectional view showing an optical member of the present embodiment. As shown in FIG. 1, the optical member 1 of the present embodiment is a member in which a polarizer layer 2 and a patterned retardation layer 3 are integrated, and has a rectangular shape in a plan view, for example. The optical member 1 is bonded to the surface on the viewing side of a liquid crystal panel (not shown) via an adhesive layer 9. In the following description, the polarizer layer 2 side of the optical member 1 may be referred to as a panel side, and the patterned retardation layer 3 side may be referred to as a viewing side.

Also, “one surface side of the retardation layer” in the present invention refers to the panel side of the patterned retardation layer 3 in the optical member 1. Similarly, “the other surface side of the retardation layer” in the present invention refers to the viewing side of the patterned retardation layer 3 in the optical member 1.

In the optical member 1 of the present embodiment, the first protective layer 4 and the hard coat layer 5 are laminated in this order on the viewing side of the patterned retardation layer 3. In the optical member 1, the second protective layer 6 is provided on the panel side of the polarizer layer 2. Further, the patterned retardation layer 3 and the polarizer layer 2 are bonded via an adhesive layer 7. Similarly, the polarizer layer 2 and the second protective layer 6 are bonded via an adhesive layer 8. The first protective layer 4 corresponds to the retardation layer protective layer in the present invention. The second protective layer 6 corresponds to the polarizer layer protective layer in the present invention.

As shown in FIG. 1, the optical member 1 may have a protective film Pf that covers the hard coat layer 5. Moreover, you may have peeling film Sf through the adhesive layer 9 provided so that the 2nd protective layer 6 was covered.
Hereinafter, it demonstrates in order.

(Polarizer layer)
The polarizer layer 2 has a property of transmitting light having a vibration surface in a certain direction out of incident light and absorbing light having a vibration surface perpendicular to the light. Light emitted through the polarizer layer 2 is linearly polarized light.

The polarizer layer 2 includes a step of uniaxially stretching a polyvinyl alcohol resin film, a step of adsorbing a dichroic dye by dyeing the polyvinyl alcohol resin film with a dichroic dye, and an adsorption of the dichroic dye. The polarizing film manufactured through the process of processing the made polyvinyl alcohol-type resin film with a boric acid aqueous solution, and the process of washing with water after the process with a boric acid aqueous solution can be used.

The polyvinyl alcohol resin can be obtained by saponifying a polyvinyl acetate resin. The polyvinyl acetate resin may be a copolymer of vinyl acetate and another monomer copolymerizable therewith in addition to polyvinyl acetate, which is a homopolymer of vinyl acetate. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group.

As the dichroic dye, iodine or a dichroic organic dye is used. When iodine is used as the dichroic dye, a method of immersing and dyeing a polyvinyl alcohol-based resin film in an aqueous solution containing iodine and potassium iodide can be employed.

Uniaxial stretching of the polyvinyl alcohol resin film may be performed before dyeing with the dichroic dye, may be performed simultaneously with dyeing with the dichroic dye, or after dyeing with the dichroic dye, It may be performed during the acid treatment.

As described above, a polarizing film having a dichroic dye adsorbed and oriented on a polyvinyl alcohol resin film can be produced. The obtained polarizing film is used as the polarizer layer 2 constituting the optical member 1.

The thickness of the polarizer layer 2 can be, for example, 5 μm or more and 40 μm or less. In the present embodiment, the thickness of the polarizer layer 2 is 30 μm.

(Retardation layer)
The patterned retardation layer 3 has a property of emitting incident linearly polarized light as light of two types of polarization states. The patterned retardation layer 3 has a photo-alignment layer 31 and a retardation layer 32.

The photo-alignment layer 31 has an alignment regulating force of a material having liquid crystallinity (hereinafter referred to as a liquid crystal material). The photo-alignment layer 31 is formed using a polymerizable photo-alignment material. As the photo-alignment material, a material that expresses alignment regulating force when exposed to polarized light is used. The photo-alignment layer 31 retaining the alignment regulating force can be formed by exposing the photo-alignment material to polarized light and polymerizing it after expressing the alignment regulating force. As such a polymerizable photo-alignment material, a conventionally known material can be used.

The photo-alignment layer 31 of the present embodiment has two

alignment regions

31a and 31b in which the direction in which the alignment regulating force works is 90 degrees different in plan view. Each of the

alignment regions

31a and 31b is a strip-like region extending in the same direction as one side of the optical member 1 having a rectangular shape in a plan view, and in the direction that should be the left-right direction in a liquid crystal display device that is normally incorporated. In addition, the

alignment regions

31a and 31b are alternately provided in a direction intersecting with the extending direction of the

alignment regions

31a and 31b.

The retardation layer 32 has a first region 32a corresponding to the alignment region 31a of the photo-alignment layer 31, and a second region 32b corresponding to the alignment region 31b. That is, the first region 32a and the second region 32b are band-like regions extending in the same direction as one side of the optical member 1 that is rectangular in plan view, and alternately in a direction intersecting with the extending direction of the first region 32a and the second region 32b. Is provided.

FIG. 1 is a cross-sectional view of the

alignment regions

31a and 31b of the photo-alignment layer 31 and a cross section intersecting with the extending direction of the first region 32a and the second region 32b of the retardation layer 32. In FIG. 1, for easy understanding, the

alignment regions

31a and 31b of the photo-alignment layer 31 and the first region 32a and the second region 32b of the retardation layer 32 are clearly shown.

The first region 32a and the second region 32b exhibit different refractive index anisotropies. Therefore, the retardation layer 32 changes the linearly polarized light incident on the first region 32a to light in the first polarization state. Further, the linearly polarized light incident on the second region 32b is changed to light in the second polarization state.

“Light in the first polarization state” and “light in the second polarization state” are, for example, two types of linearly polarized light that indicates vibration directions orthogonal to each other, and two types of circularly polarized light (right circularly polarized light and left circularly polarized light). Polarization).

Such a retardation layer 32 is formed using a liquid crystal material having a polymerizable functional group. That is, the retardation layer 32 arranges the liquid crystal material in two directions according to the alignment regulating force of the

alignment regions

31a and 31b of the photo-alignment layer 31, and further reacts the polymerizable functional group of the liquid crystal material. It is obtained by maintaining and curing the liquid crystal phase of the liquid crystal material to be used. As such a polymerizable liquid crystal material, a conventionally known material can be used.

(First protective layer)
The first protective layer 4 has a function of protecting the patterned retardation layer 3. Moreover, when using the retardation film which the patterned phase difference layer 3 and the 1st protective layer 4 laminated | stacked as a constituent material of the optical member 1, it is used as a base material which supports the patterned phase difference layer 3. FIG.

Examples of the material for forming the first protective layer 4 include triacetyl cellulose (TAC) resin, polycarbonate resin, polyvinyl alcohol resin, polystyrene resin, (meth) acrylate resin, cyclic polyolefin resin, and polypropylene resin. Include polyolefin resins, polyarylate resins, polyimide resins, polyamide resins, and the like.

The thickness of the first protective layer 4 is preferably 35 μm or more, more preferably 50 μm or more, and further preferably 70 μm or more. Moreover, it is preferable that the thickness of the 1st protective layer 4 shall be 100 micrometers or less, for example. The thickness of the 1st protective layer 4 used for the optical member 1 can be measured based on the enlarged photograph which imaged the cross section of the optical member 1 with the electron microscope, for example. In the present embodiment, the thickness of the first protective layer 4 is 57 μm.

As will be described later, the hard coat layer 5 of the optical member 1 is provided with a curable resin as a forming material. Therefore, when the hard coat layer 5 is formed, it is expected that curing shrinkage of the curable resin occurs and stress due to the curing shrinkage is applied to the retardation layer 32. When such a hard coat layer 5 is thickened, the effect of protecting the patterned retardation layer 3 is high. On the other hand, when the hard coat layer 5 is thickened, curing shrinkage during formation increases. Therefore, when the hard coat layer 5 is thickened, it is expected that the stress applied to the retardation layer 32 increases due to curing shrinkage.

The phase difference of the retardation layer 32 is easily changed by the stress applied to the retardation layer 32. Therefore, the formation of the hard coat layer 5 may cause an unexpected retardation shift in the retardation layer 32. If the phase difference layer 32 has such a phase difference, the image light emitted from the phase difference layer 32 is not in a desired polarization state, which may cause crosstalk and reduce the image quality of the stereoscopic display image. is there.

However, in the optical member 1 of the present embodiment, since the thickness of the first protective layer 4 is 35 μm or more, the stress at the time of forming the hard coat layer 5 is not easily applied to the retardation layer 32, and the retardation of the retardation layer 32. Can be maintained. Thereby, the polarization state of the image light emitted from the retardation layer 32 can be set to a desired state, and crosstalk can be suppressed.

(Hard coat layer)
The hard coat layer 5 is a layer of a curable resin and has a function of suppressing scratches on the surface of the optical member 1.

As the hard coat layer 5, for example, a resin composition containing an active energy ray-curable resin that is polymerized and cured by irradiation with active energy rays and a polymerization initiator that generates radicals by irradiation with active energy rays is formed. It can be.

The active energy ray-curable resin contains, for example, a polyfunctional (meth) acrylate compound. The polyfunctional (meth) acrylate compound is a compound having at least two (meth) acryloyloxy groups in the molecule.

Examples of the polyfunctional (meth) acrylate compound include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, tri Methylolpropane tri (meth) acrylate, trimethylolethane tri (meth) acrylate, tetramethylolmethane tri (meth) acrylate, tetramethylolmethane tetra (meth) acrylate, pentaglycerol tri (meth) acrylate, pentaerythritol tri (meth) acrylate , Pentaerythritol tetra (meth) acrylate, glycerin tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, dipentaerythritol Tetra (meth) acrylate dipentaerythritol penta (meth) acrylate dipentaerythritol hexa (meth) acrylate and tris ((meth) acryloyloxyethyl) isocyanurate;
A phosphazene-based (meth) acrylate compound in which a (meth) acryloyloxy group is introduced into the phosphazene ring of the phosphazene compound;
A urethane (meth) acrylate compound obtained by reaction of a polyisocyanate having at least two isocyanate groups in the molecule with a polyol compound having at least one (meth) acryloyloxy group and a hydroxyl group;
A polyester (meth) acrylate compound obtained by reaction of at least two carboxylic acid halides in the molecule with a polyol compound having at least one (meth) acryloyloxy group and a hydroxyl group;
Oligomers such as dimers and trimers of the above compounds;
Can be mentioned. These compounds may be used alone or in combination of two or more.

The active energy ray-curable resin may contain a monofunctional (meth) acrylate resin in addition to the polyfunctional (meth) acrylate compound.

The active energy ray-curable resin may contain a polymerizable oligomer. By including a polymerizable oligomer, the hardness of the hard coat layer can be adjusted.

As the polymerizable oligomer, terminal (meth) acrylate polymethyl methacrylate, terminal styryl poly (meth) acrylate, terminal (meth) acrylate polystyrene, terminal (meth) acrylate polyethylene glycol, terminal (meth) acrylate acrylonitrile-styrene copolymer, Examples thereof include macromonomers such as a terminal (meth) acrylate styrene-methyl (meth) acrylate copolymer. These oligomers may be used alone or in combination of two or more.

The polymerization initiator contained in the active energy ray-curable resin composition is a photopolymerization initiator that generates radicals upon irradiation with active energy rays. As the polymerization initiator, those usually known can be used. Only one polymerization initiator may be used, or two or more polymerization initiators may be used in combination.

The polymerization initiator may be used in combination with a dye sensitizer. Thereby, even when light having a wavelength different from the absorption wavelength of the polymerization initiator is used, the polymerization of the active energy ray-curable resin composition can be promoted as long as the light can be absorbed by the dye sensitizer. Can do.

The hard coat layer 5 is formed by coating such an active energy ray-curable resin composition on the surface of the first protective layer 4 to form a coating film, and irradiating the coating film with an active energy ray for polymerization and curing. Can be formed by.

The thickness of the hard coat layer 5 is preferably 1 μm or more. The thickness of the hard coat layer is preferably 10 μm or less. In the present embodiment, the thickness of the hard coat layer 5 is 4 μm.

At this time, the hardness of the hard coat layer 5 is preferably F or higher and 2H or lower in pencil hardness measured with a load of 500 g. In this specification, “pencil hardness” refers to a value measured based on the ASTM D3363 standard. In the present embodiment, the pencil hardness of the hard coat layer 5 is 2H.

The hard coat layer 5 is provided with a curable resin as a forming material. Therefore, when the hard coat layer 5 is formed, it is expected that curing shrinkage of the curable resin occurs and stress due to the curing shrinkage is applied to the retardation layer 32. Further, when the hard coat layer 5 is as thick as 1 μm or more, the effect of surface protection is high. On the other hand, when the hard coat layer 5 is thickened, curing shrinkage at the time of formation increases.

Since there is a correlation between the degree of polymerization of the hard coat layer 5 and the pencil hardness of the hard coat layer 5, the hard coat layer having a high pencil hardness is more curable resin than the hard coat layer having a low pencil hardness. The degree of polymerization is relatively high. Therefore, it is considered that the hard coat layer having a high pencil hardness has a larger curing shrinkage and a stronger stress than the hard coat layer having a low pencil hardness.

However, in the optical member 1 of the present embodiment, even when the thickness of the hard coat layer 5 is 1 μm or more, the pencil hardness of the hard coat layer 5 is F or more and 2H or less. Such a hard coat layer 5 has a hardness sufficient as a hard coat layer and suppresses the degree of polymerization of the curable resin. Therefore, it is possible to suppress the stress during the formation of the hard coat layer 5 while suppressing the curing shrinkage that occurs during the formation of the hard coat layer 5, and to maintain the retardation of the retardation layer 32. Thereby, the polarization state of the image light emitted from the retardation layer 32 can be set to a desired state, and crosstalk can be suppressed.

The pencil hardness of the hard coat layer 5 can be controlled by adjusting the degree of polymerization of the curable resin. The degree of polymerization of the active energy ray-curable resin composition can be controlled by changing the irradiation time of the active energy ray and the intensity of the active energy ray to be irradiated. When the irradiation time of the active energy ray becomes longer, the degree of polymerization of the active energy ray curable resin composition increases. Moreover, when the intensity | strength of the active energy ray to irradiate becomes large, the polymerization degree of an active energy ray curable resin composition will become large.

As described above, the pencil hardness of the hard coat layer 5 can be controlled by adding a polymerizable oligomer to the active energy ray-curable resin composition. When the content of the polymerizable oligomer increases, the pencil hardness of the hard coat layer 5 tends to decrease.

(Anti-glare layer)
In the optical member 1 of the present embodiment, the hard coat layer 5 has a plurality of irregularities formed on the surface, or has particles inside, thereby reflecting external light irregularly and suppressing glare and glare. Functions are granted. In the following description, the hard coat layer 5 imparted with the antiglare property may be referred to as an “antiglare layer”.

In order to impart an anti-glare function to the hard coat layer (anti-glare layer) 5, fine particles that refract light to the above-described active energy ray-curable resin composition, and preferably impart an uneven shape to the surface of the hard coat layer. The structure which mixes can be employ | adopted.

As the fine particles to be used, those having various shapes such as a spherical shape, an elliptical shape, and an irregular shape can be adopted. The fine particles may be those in which primary particles are dispersed, or may be aggregates of secondary particles or more.

The fine particles used preferably have an average particle size of 0.3 μm or more and 10 μm or less. The upper limit of the average particle diameter of the fine particles is preferably 8 μm or less, and more preferably 6 μm or less. Further, the lower limit of the average particle diameter of the fine particles is preferably 0.5 μm or more, and more preferably 1.0 μm or more. These upper limit value and lower limit value can be arbitrarily combined. When the average particle diameter of the fine particles is included in the above range, appropriate unevenness can be imparted to the antiglare layer.

The “average particle size” means the average particle size if the fine particles are monodisperse particles (particles having a single shape), and the particle size distribution if the particles have a broad particle size distribution. By measurement, the particle size of the most abundant particles represents the average particle size. The particle size of the fine particles can be measured by a Coulter counter method.

As such fine particles, those using an inorganic material or an organic material as a forming material can be used. The fine particles to be used are preferably those having light transmittance in the visible light region.

An example of an organic material that forms fine particles is a resin material. For example, polystyrene (refractive index 1.60), melamine resin (refractive index 1.57), acrylic resin (refractive index 1.49 to 1.535), acrylic-styrene resin (refractive index 1.54 to 1.58). , Benzoguanamine-formaldehyde condensate (refractive index 1.66), benzoguanamine / melamine / formaldehyde condensate (refractive index 1.52-1.66), melamine / formaldehyde condensate (refractive index 1.66), polycarbonate, polyethylene, etc. Is mentioned.

The fine particles having an organic material as a forming material preferably have a hydrophobic group on the surface, and examples thereof include fine particles having polystyrene as a forming material.

In addition, examples of the inorganic material forming the fine particles include metal oxides such as aluminum oxide and silica. The fine particles made of an inorganic material may be subjected to a hydrophobic treatment on the surface. Hydrophobizing treatment is performed by a method of chemically bonding a compound to the surface of the fine particle or a physical method of penetrating a void in the composition that forms the fine particle without chemically bonding to the surface of the fine particle. Can be mentioned.

These fine particles may be used alone or in combination of two or more. When two or more kinds of fine particles are used in combination, it is preferable to use fine particles having two or more different refractive indexes. In the case of using a mixture of fine particles having different refractive indexes, an average value corresponding to the refractive index and the use ratio of each fine particle can be regarded as the refraction of the fine particles to be used. Therefore, the refractive index of the fine particles can be easily controlled by adjusting the mixing ratio of the fine particles. Thereby, for example, by adjusting the refractive index of the active energy ray-curable resin composition and the refractive index of the fine particles, the transparency and antiglare property of the antiglare layer can be easily adjusted.

In addition, as another method for imparting an antiglare function to the hard coat layer 5, polymerization is performed by irradiating the coating film with active energy rays in a state where the uneven shape is embossed on the coating film of the active energy ray-curable resin composition. -A curing method can be employed.

The antiglare layer preferably has an arithmetic average height Pa of 0.15 μm or less in an arbitrary cross-sectional curve on the uneven surface and a maximum cross-sectional height Pt of 1.5 μm or less.
The arithmetic average height Pa is preferably 0.03 μm or more. The arithmetic average height Pa is preferably 0.07 μm or less.
The maximum cross-sectional height Pt is preferably 0.4 μm or more. The maximum cross-sectional height Pt is preferably 0.8 μm or less.

In this embodiment, the arithmetic average height Pa and the maximum cross-sectional height Pt in the cross-sectional curve of the concavo-convex surface can be measured using a commercially available general contact surface roughness meter in accordance with JIS B0601. it can. It is also possible to measure the surface shape with an apparatus such as a confocal microscope, an interference microscope, an atomic force microscope (AFM), etc., and obtain it by calculation from the three-dimensional information of the surface shape. In addition, when calculating from three-dimensional information, in order to ensure sufficient reference length, it is preferable to measure three or more areas of 200 μm × 200 μm or more and use the average value as a measurement value.

In the present embodiment, the arithmetic average height Pa of the antiglare layer is 0.049 μm, and the maximum cross-sectional height Pt is 0.599 μm.

In the antiglare layer, the ratio of the surface inclination angle of 2 ° or more is preferably 30% or less, more preferably 10% or less, and further preferably 5% or less. In the antiglare layer, the ratio of the surface inclination angle of 2 ° or more is preferably 1% or more, and more preferably 2% or more. These upper limit value and lower limit value can be arbitrarily combined.

FIG. 2 is a schematic enlarged view of the surface of the hard coat layer (antiglare layer) 5 of the optical member 1 of the present embodiment. FIG. 2 shows a state where fine convex portions 51 are formed on the surface of the hard coat layer 5.

2, the average surface of the entire hard coat layer 5 is denoted by reference numeral 59, the normal of the average surface of the hard coat layer 5 at an arbitrary point 5P on the surface of the hard coat layer 5 is denoted by reference numeral 55, and the arbitrary surface of the hard coat layer 5 A local normal line taking into account the unevenness of the hard coat layer 5 at the point 5P is indicated by reference numeral 56. Of the angles formed by the normal 55 and the normal 56, the angle that opens in the direction of the normal 55 is indicated by an angle θ.
The inclination angle of the surface in the antiglare layer refers to the angle θ.

In FIG. 2, the xyz coordinate system is adopted, the orthogonal direction in the plane of the average surface 59 is displayed by the x-axis and the y-axis, and the film thickness direction is displayed by the z-axis.

The inclination angle of the surface of the antiglare layer can be determined from the three-dimensional shape of the surface roughness measured using a non-contact three-dimensional surface shape / roughness measuring machine. The horizontal resolution required for the measuring instrument is at least 5 μm or less, preferably 2 μm or less, and the vertical resolution is at least 0.1 μm or less, preferably 0.01 μm or less.

Non-contact three-dimensional surface shape / roughness measuring instruments suitable for measuring the angle of inclination of the surface of the antiglare layer are products of Zygo Corporation in the United States, such as the “NewView5000” series available from Zygo Corporation in Japan. Can do. A larger measurement area is preferable, but at least 100 μm × 100 μm or more, preferably 500 μm × 500 μm or more.

FIG. 3 is a schematic diagram for explaining a method of measuring the inclination angle of the antiglare layer surface. In FIG. 3, the xyz coordinate system is adopted as in FIG.

In measuring the inclination angle of the antiglare layer surface, first, the point of interest A on the average surface 59 is determined. The point of interest A corresponds to an arbitrary point 5P on the surface of the antiglare layer (hard coat layer 5).
Next, points B and D are taken approximately symmetrically with respect to the point of interest A on the x axis passing through the point of interest A, and near the point of interest A on the y axis passing through the point of interest A. The points C and E are taken almost symmetrically with respect to the point of interest A.
Next, the points Q, R, S, and T on the surface of the antiglare layer corresponding to these points B, C, D, and E are determined.

On the other hand, in the average plane 59, a straight line passing through the point C and parallel to the x axis, a straight line passing through the point E and parallel to the x axis, a straight line passing through the point B and parallel to the y axis, and a straight line passing through the point D and parallel to the y axis. Are set, and intersections F, G, H, and I of the respective straight lines are determined.

In FIG. 3, the position of the antiglare layer is drawn above the surface FGHI (that is, the average surface 59), but the position of the antiglare layer may be above the average surface 59. Yes, sometimes it goes down.

And by the point 5P on the actual anti-glare layer corresponding to the point of interest A and the points Q, R, S, T on the actual film surface corresponding to the four points B, C, D, E, a total of 5 points Assume four triangles PQR, PRS, PST and PTQ to be drawn.
Next,

unit vectors

56a, 56b, 56c, and 56d in the normal direction of each triangle PQR, PRS, PST, and PTQ are obtained.
Next, a vector obtained by averaging the

unit vectors

56a, 56b, 56c, and 56d (hereinafter referred to as an average normal vector) is obtained. The inclination angle (angle θ) of the antiglare layer surface can be obtained by obtaining the polar angle of the average normal vector. That is, the direction of the obtained average normal vector coincides with the direction of the local normal 56 in consideration of the unevenness of the hard coat layer 5.

Similarly, after obtaining the inclination angle for each measurement point, a histogram of the inclination angle is calculated.
In the present embodiment, the ratio of the surface inclination angle of 2 ° or more is 3.4%.

In the antiglare layer, the image light is refracted and emitted in the uneven shape formed on the surface on the viewing side. For this reason, if the angle of refraction in the antiglare layer is too large, crosstalk occurs, which may reduce the image quality of the stereoscopic display image.

On the other hand, in the optical member 1 of the present embodiment, the arithmetic average height Pa in an arbitrary cross-sectional curve of the uneven surface of the antiglare layer is 0.15 μm or less, and the maximum cross-sectional height Pt is 1.5 μm or less. Therefore, excessive refraction on the surface of the antiglare layer is unlikely to occur, and crosstalk can be suppressed.

When the anti-glare layer is formed by mixing fine particles with the active energy ray-curable resin composition, the arithmetic average height Pa and the inclination angle in the cross-sectional curve of the anti-glare layer are the amount of fine particles mixed, the size of the fine particles, It can be controlled by changing the particle size distribution of the fine particles. When the fine particles are aggregates, the arithmetic average height Pa and the inclination angle in the cross-sectional curve can also be controlled by controlling the aggregation state.

When an antiglare layer is formed by embossing an uneven shape on the coating film of the active energy ray-curable resin composition, the arithmetic average height Pa and inclination angle in the cross-sectional curve of the antiglare layer are the unevenness of the die to be embossed. It can be controlled by changing the shape.

(Second protective layer)
The second protective layer 6 has a function of protecting the polarizer layer 2.
As a material for forming the second protective layer 6, the same material as the first protective layer 4 described above can be employed. For example, triacetyl cellulose (TAC) resin, polycarbonate resin, polyvinyl alcohol resin, polystyrene resin, (meth) acrylate resin, polyolefin resin including cyclic polyolefin resin and polypropylene resin, polyarylate resin , Polyimide resins, polyamide resins and the like.

The thickness of the second protective layer 6 is usually 5 μm or more, preferably 15 μm or more, and usually 80 μm or less, preferably 60 μm or less, more preferably 50 μm or less. The upper limit value and the lower limit value can be arbitrarily combined with the thickness of the second protective layer 6. The thickness of the second protective layer 6 used in the optical member 1 can be measured based on, for example, an enlarged photograph obtained by imaging the cross section of the optical member 1 with an electron microscope. In the present embodiment, the thickness of the second protective layer 6 is 40 μm.

In the display device in which the optical member 1 is bonded to the display surface, the image light for the right eye emitted from the pixels is incident on the corresponding region (for example, the first region 32a) in the retardation layer 32. It is emitted as polarized image light for the right eye.

However, when the thickness of the optical member 1 from the surface on the panel side to the phase difference layer 32 is increased, the image light emitted obliquely from the pixels of the display panel is supposed to be incident on the phase difference layer 32 (for example, the first region). There is a risk of entering a region (for example, the second region 32b) different from the region 32a). In this case, crosstalk occurs due to the image light emitted obliquely, and the image quality of the stereoscopic display image is deteriorated.

On the other hand, in the optical member 1 of the present embodiment, since the thickness of the second protective layer 6 is 5 μm or more and 80 μm or less, the image light emitted obliquely from the pixel is bonded to the display panel. It is easy to enter a predetermined region in the retardation layer, and crosstalk can be suppressed.

Further, the second protective layer 6 preferably has an in-plane retardation R _o of 10 nm or less, and ideally 0 nm. The second protective layer 6 preferably has a thickness direction retardation _Rth of 10 nm or less, and ideally 0 nm. Further, the second protective layer 6 preferably has an Nz coefficient of 10 or less, and ideally 0.

Here, the in-plane slow axis direction of the second protective layer 6 is the x-axis direction, the in-plane fast axis direction is the y-axis direction, and the thickness direction of the second protective layer 6 is the z-axis direction. the rate _n x, the refractive index in the y-axis direction _n y, the refractive index in the z-axis direction _{n z,} the thickness of the second protective layer 6 d (unit: nm) when the in-plane retardation _R o, The thickness direction retardation R _th and the Nz coefficient are values defined by the following equations (1) to (3).
R _o = (n _x −n _y ) × d (1)
R _th = [(n _x + n _y ) / 2−n _z ] × d (2)
Nz = (n _x −n _z ) / (n _x −n _y ) (3)

In the present embodiment, the in-plane retardation R _o is 1.0 nm, the thickness direction retardation R _th is 1.4 nm, and the Nz coefficient is 1.96.

As a material for forming the second protective layer 6, for example, an unstretched film can be used as the R _o , R _th , and Nz coefficients exhibit such values.

Also, the second protective layer 6 used in the optical member 1, R _{o, R} th, of the _Nz coefficient values, to isolate the second protective layer 6 was peeled off the layers from the optical member 1, It can be measured.

In the second protective layer 6 in which the R _o , R _th , and Nz coefficients have the values as described above, the light transmitted through the second protective layer 6 is in a desired polarization state, so that crosstalk hardly occurs and is good. A stereoscopic display image can be displayed.

(Adhesive layer)
The material for forming the

adhesive layers

7 and 8 is composed of a composition using a polyvinyl alcohol resin or a urethane resin as a main component and dissolved in water, or a water-based adhesive dispersed in water, a photo-curable resin and light. A solvent-free photocurable adhesive containing a cationic polymerization initiator and the like can be mentioned. Since there is little volume shrinkage at the time of manufacture and thickness control is easy, it is preferable to use a photocurable adhesive as a material for forming the

adhesive layers

7 and 8, and it is more preferable to use an ultraviolet curable adhesive. preferable.

The UV curable adhesive can be any of those conventionally used in the production of polarizing plates as long as it is supplied in a liquid coatable state. From the viewpoint of weather resistance and polymerizability, the ultraviolet curable adhesive is a cationic polymerizable compound such as an epoxy compound, more specifically a molecule as described in Japanese Patent Application Laid-Open No. 2004-245925. What contains the epoxy compound which does not have an aromatic ring in it as one of an ultraviolet curable component is preferable.

Such an epoxy compound is, for example, a hydrogenated epoxy obtained by nuclear hydrogenation of an aromatic polyhydroxy compound, which is a raw material of an aromatic epoxy compound represented by diglycidyl ether of bisphenol A, and converting it to glycidyl ether. The compound, an alicyclic epoxy compound having at least one epoxy group bonded to the alicyclic ring in the molecule, an aliphatic epoxy compound typified by a glycidyl ether of an aliphatic polyhydroxy compound, and the like.

In addition to cationically polymerizable compounds such as epoxy compounds as representative examples of ultraviolet curable adhesives, polymerization initiators, particularly to generate cationic species or Lewis acids upon irradiation with ultraviolet rays, initiate polymerization of cationically polymerizable compounds. The photocationic polymerization initiator is blended. Further, a thermal cationic polymerization initiator that initiates polymerization by heating, and various other additives such as a photosensitizer may be blended.

The material for forming the

adhesive layers

7 and 8 may be the same or different, but from the viewpoint of productivity, the

adhesive layers

7 and 8 are bonded to each other on the premise that an appropriate adhesive force can be obtained. It is more preferable to form using an agent.

The thickness of the

adhesive layers

7 and 8 is preferably in the range of 0.5 μm to 5 μm. When the thickness of the

adhesive layers

7 and 8 is 0.5 μm or more, unevenness in adhesive strength is unlikely to occur. On the other hand, when the thickness of the

adhesive layers

7 and 8 is 5 μm or less, the manufacturing cost does not increase and the hue of the polarizing plate is hardly affected. The thickness of the

adhesive layers

7 and 8 is more preferably in the range of 1 μm to 4 μm, and further preferably in the range of 1.5 μm to 3.5 μm. In the present embodiment, the thickness of the

adhesive layers

7 and 8 is 2 μm.

(Adhesive layer)
The pressure-sensitive adhesive layer 9 is used, for example, for bonding the optical member 1 to a display surface of a liquid crystal panel (not shown). As an adhesive which forms the adhesive layer 9, what uses acrylic resin, silicone resin, polyester, polyurethane, polyether etc. as base resin can be mentioned, for example. Among them, acrylic adhesives based on acrylic resins are excellent in optical transparency, retain moderate wettability and cohesion, and are also excellent in weather resistance and heat resistance. It is preferably used because peeling problems such as floating and peeling hardly occur under the conditions.

The acrylic resin constituting the acrylic pressure-sensitive adhesive includes an acrylic acid alkyl ester having an ester group having an alkyl group having 20 or less carbon atoms such as a methyl group, an ethyl group, a butyl group, or a 2-ethylhexyl group, An acrylic copolymer with a functional group-containing (meth) acrylic monomer such as (meth) acrylic acid and (meth) acrylic acid-2-hydroxyethyl is preferably used.

The pressure-sensitive adhesive layer 9 containing such an acrylic copolymer does not cause adhesive residue or the like on the glass substrate when it is necessary to peel off after having been bonded to the liquid crystal panel. It can be peeled relatively easily. The acrylic copolymer used for the pressure-sensitive adhesive layer 9 preferably has a glass transition temperature of 25 ° C. or lower, and more preferably 0 ° C. or lower. The acrylic copolymer usually has a weight average molecular weight of 100,000 or more.

As a method for forming the pressure-sensitive adhesive layer, for example, a release film Sf, which will be described later, is used as a substrate, and a pressure-sensitive adhesive layer 9 is formed by applying a pressure-sensitive adhesive on the surface of the release film Sf. A method of bonding the layer 9 to the second protective layer 6, a method of directly applying a pressure-sensitive adhesive on the surface of the second protective layer 6 to form the pressure-sensitive adhesive layer 9, and then bonding a release film Sf thereon. There is.

Moreover, after forming the adhesive layer 9 on the surface of the release film Sf, a double-sided release film type adhesive sheet in which another release film is bonded to the adhesive layer 9 can also be used. Such a double-sided release film-type pressure-sensitive adhesive sheet can be peeled off from the release film on one side at a necessary time and bonded to the second protective layer 6. A commercial item can also be used for such a double-sided peeling film type adhesive sheet.

The thickness of the pressure-sensitive adhesive layer 9 is appropriately determined according to the adhesive force and the like, but is preferably 1 μm or more and 40 μm or less. In order to obtain a thin polarizing plate without impairing properties such as workability and durability, the thickness of the pressure-sensitive adhesive layer 9 is preferably 3 μm or more and 25 μm or less. By setting the thickness of the pressure-sensitive adhesive layer 9 within this range, it is possible to maintain brightness when the liquid crystal display device is viewed from the front or from an oblique direction, and to prevent bleeding and blurring of the display image.

(Protective film)
A protective film Pf is bonded to the surface on the viewing side of the optical member 1. The protective film Pf protects the surface of the optical member 1 and is provided to be peelable from the optical member 1.

As the protective film Pf, a transparent resin film formed by forming an adhesive / peelable resin layer or an adhesive resin layer and imparting weak adhesiveness is used. Examples of the transparent resin film include extruded films of thermoplastic resins such as polyethylene terephthalate, polyethylene naphtholate, polyethylene, and polypropylene, co-extruded films combining them, and films obtained by stretching them uniaxially or biaxially. be able to. As the transparent resin film, it is preferable to use polyethylene terephthalate or polyethylene uniaxially or biaxially stretched film which is excellent in transparency and homogeneity and is inexpensive.

Examples of the adhesive / peelable resin layer include acrylic adhesives, natural rubber adhesives, styrene-butadiene copolymer resin adhesives, polyisobutylene adhesives, vinyl ether resin adhesives, and silicone resin adhesives. And so on. Examples of the adhesive resin layer include an ethylene-vinyl acetate copolymer resin. As the adhesive / peelable resin layer, it is preferable to use an acrylic adhesive having excellent transparency.

The thickness of the protective film Pf is preferably 15 μm or more and 75 μm or less. When the thickness is 15 μm or more, handling becomes easy and the originally required surface protection performance can be secured. On the other hand, when the thickness is 75 μm or less, the rigidity does not become too strong, the handling becomes easy, and the peel strength is appropriately suppressed.

(Peeling film)
A release film Sf is bonded to the surface of the optical member 1 on the panel side. This release film Sf covers the pressure-sensitive adhesive layer 9 and protects the pressure-sensitive adhesive layer 9 when the optical member 1 is stored, and is provided so as to be peelable.

As the release film Sf, a transparent resin film similar to the protective film Pf described above can be used.

Such an optical member 1 uses three types of optical combs in which the width of the dark part and the bright part is 0.5 mm, 1.0 mm, and 2.0 mm on the surface of the antiglare layer, and the incident angle of light is 45 °. It is preferable that the sum of the image clarity measured by the reflection method is 30% or more and 200% or less. The sum of image sharpness measured by the reflection method at a light incident angle of 45 ° is more preferably 100% or more. In the present embodiment, “image definition” refers to a value measured based on JIS K 7374.

In JIS K 7374, the ratio of the width of the dark part to the bright part is 1: 1 as an optical comb used for measuring the image definition, and the widths are 0.125 mm, 0.5 mm, 1.0 mm and 2.0 mm. Four types are defined. Among these, when an optical comb having a width of 0.125 mm is used, an error in the measured value becomes large when measuring the image sharpness of the antiglare layer of the present embodiment. Therefore, an optical comb having a width of 0.125 mm is used. In this case, the measured value is not added to the sum, and image sharpness measured using three types of optical combs having widths of 0.5 mm, 1.0 mm, and 2.0 mm is adopted.

In the following description, “an image measured by the reflection method at a light incident angle of 45 ° using three types of optical combs having a width of 0.5 mm, 1.0 mm, and 2.0 mm in the dark part and the bright part. “Sum of sharpness” is referred to as reflection sharpness. In this definition, the maximum value of reflection sharpness is 300%.
In the present embodiment, the reflection definition of the antiglare layer is 160.8%.

In addition, for the light transmitted from the polarizer layer side (panel side) of the optical member 1, four types of optical combs in which the widths of the dark part and the bright part are 0.125 mm, 0.5 mm, 1.0 mm, and 2.0 mm. It is preferable that the sum of the image clarity measured by the transmission method is 150% or more and 350% or less. The sum of image sharpness measured by the transmission method is more preferably 180% or more, and further preferably 250% or more. Further, the sum of image clarity measured by the transmission method is more preferably 330% or less. Regarding the sum of image sharpness measured by the transmission method, the upper limit value and the lower limit value can be arbitrarily combined.

In the following description, “the image sharpness measured by the transmission method using four types of optical combs in which the width of the dark part and the bright part is 0.125 mm, 0.5 mm, 1.0 mm, and 2.0 mm”. “Sum” is referred to as transmission clarity. In this definition, the maximum value of transmitted sharpness is 400%.
In the present embodiment, the transmission clarity of the antiglare layer is 306.7%.

When the optical member 1 shows such a value, when it is bonded to a display panel to obtain a 3D liquid crystal display device, a clear stereoscopic image display becomes possible.

According to the first optical member configured as described above, the arithmetic average height Pa of the antiglare layer is 0.15 μm or less, and the maximum cross-sectional height Pt is 1.5 μm or less. As a result of maintaining the polarization state, it is possible to suppress deterioration in image quality. Therefore, an optical member capable of displaying a favorable stereoscopic image can be provided.

In addition, according to the second optical member having the above-described configuration, the image sharpness measured by the reflection method using optical combs having widths of 0.5 mm, 1.0 mm, and 2.0 mm based on JIS K 7374. Since the sum is 30% or more and 200% or less, a clear display image can be obtained, and an optical member capable of displaying a favorable stereoscopic image can be provided.

Further, according to the third optical member having the above-described configuration, the light transmitted through the second protective layer 6 is in a desired polarization state, so that the image quality is hardly deteriorated and a favorable stereoscopic image display is possible. An optical member can be provided.

Moreover, according to the 4th optical member of the above structures, the hard-coat layer 5 which an optical member has becomes a thing which suppressed the polymerization degree of curable resin, having sufficient hardness as a hard-coat layer. ing. Therefore, it is possible to suppress the stress during the formation of the hard coat layer 5 while suppressing the curing shrinkage that occurs during the formation of the hard coat layer 5, and to maintain the retardation of the retardation layer 32. Thereby, the polarization state of the image light emitted from the retardation layer 32 can be set to a desired state, and an optical member capable of displaying a favorable stereoscopic image can be provided.

Further, according to the fifth optical member having the above-described configuration, when pasted on the display panel, image light emitted obliquely from the pixels is likely to enter a predetermined region in the retardation layer. Therefore, an optical member capable of displaying a favorable stereoscopic image can be provided.

Further, according to the sixth optical member having the above-described configuration, since the first protective layer 4 having a thickness of 35 μm or more is provided, the stress at the time of forming the hard coat layer 5 is not easily applied to the retardation layer 32, The phase difference of the phase difference layer 32 can be maintained. Thereby, the polarization state of the image light emitted from the retardation layer 32 can be set to a desired state, and an optical member capable of displaying a favorable stereoscopic image can be provided.

In the present embodiment, the hard coat layer 5 also serves as an antiglare layer. However, the present invention is not limited to this, and an antiglare layer may be provided as another layer structure on the surface of the hard coat layer 5. .
Further, in the third to sixth optical members, the hard coat layer 5 does not have an antiglare function and can be an optical member that does not have an antiglare property.

[Display device]
4 to 6 are explanatory views showing the display device of this embodiment. FIG. 4 is a plan view showing a schematic configuration of the display device. FIG. 5 is a cross-sectional view of the display device 100 taken along the line VV shown in FIG.

As shown in FIG. 5, the display device 100 of this embodiment includes a liquid crystal panel (display panel) P, a polarizing film F11, and the optical member 1 described above.

As shown in FIGS. 4 and 5, the liquid crystal panel P includes a first substrate P1 having a rectangular shape in plan view, and a relatively small rectangular shape arranged to face the first substrate P1. And a liquid crystal layer P3 sealed between the first substrate P1 and the second substrate P2. The liquid crystal panel P has a rectangular shape that conforms to the outer shape of the first substrate P1 in a plan view, and a region that fits inside the outer periphery of the liquid crystal layer P3 in a plan view is a display region P4.

On the backlight side of the liquid crystal panel P, a polarizing film F11 is bonded. On the other hand, the optical member 1 described above is bonded to the display surface side of the liquid crystal panel P. 5, only the polarizer layer 2 and the patterned retardation layer 3 are shown in the configuration of the optical member 1 described above, and the other layer structures are omitted. The liquid crystal panel P to which the polarizing film F11 and the optical member 1 are bonded becomes the display device 100 by further incorporating a drive circuit, a backlight unit, and the like (not shown).

The driving method of the liquid crystal panel P is known in this field, for example, TN (Twisted Nematic), STN (Super Twisted Nematic), VA (Vertical Alignment), IPS (In-Plane Switching), OCB (Optically Compensated Bend). Various modes can be adopted. Among these, an IPS liquid crystal panel P can be preferably used.

The polarizing film F11 is bonded to the liquid crystal panel P through an adhesive layer. Moreover, the optical member 1 is bonded to the liquid crystal panel P through the above-described pressure-sensitive adhesive layer 9. For example, the polarizing film F11 and the optical member 1 are bonded to the liquid crystal panel P so that the polarizing film F11 and the polarizer layer 2 of the optical member 1 are in a crossed Nicols arrangement.

FIG. 6 is a plan view for explaining alignment at the time of bonding between the liquid crystal panel P and the optical member 1 when the display device 100 is manufactured.
As shown in FIG. 6, the pixels in the display area P4 of the liquid crystal panel P are red (indicated by a symbol R in FIG. 6), green (in FIG. 6) along the long side of the display area P4 (the horizontal direction of the liquid crystal panel P). The color filters corresponding to the respective colors R, G, B of blue (indicated by reference numeral G in FIG. 6) and blue (indicated by reference numeral B in FIG. 6) are periodically arranged. A large number of pixels corresponding to each color R, G, B are arranged in the left-right direction to form a pixel column L, and a large number of pixel columns L are arranged over the display area P4.

On the other hand, the optical member 1 has a plurality of first regions 32 a and a plurality of second regions 32 b extending along the long side of the optical member 1. A large number of first regions 32 a and second regions 32 b are arranged in the vertical direction corresponding to each pixel column L of the liquid crystal panel P. For example, the first region 32a is a phase difference pattern sequence that forms an image for the right eye, and the second region 32b is a phase difference pattern sequence that forms an image for the left eye.

The optical member 1 is bonded to the liquid crystal panel P so that the boundary line K between the first region 32a and the second region 32b is located between the pixel rows L of the display region P4. An FPR type 3D liquid crystal display device (display device 100) using the above is configured.

In such a display device 100, it is possible to view 3D images through polarized glasses while alternately displaying images for the left and right eyes for each line extending to the left and right of the pixels of the liquid crystal panel P and displaying them simultaneously. It has become.

Since the display device 100 having such a configuration uses the optical member 1 described above, it is possible to suppress the occurrence of crosstalk and display a favorable stereoscopic image.

Alternatively, in the display device 100 having such a configuration, the above-described optical member 1 is used, so that the display image becomes clear and a favorable stereoscopic image display is possible.

As described above, the preferred embodiments according to the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to such examples. Various shapes, combinations, and the like of the constituent members shown in the above-described examples are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

Hereinafter, the present invention will be described by way of examples, but the present invention is not limited to these examples. In the following examples, an optical member having the same configuration as the optical member described with reference to FIG. 1 was produced to confirm the effect of the present invention. Therefore, in the following description, the reference numerals shown in FIG. 1 are used as appropriate.

[Level 1]
(Production of optical member)
An optical member having the configuration shown in FIG. 1 was produced and evaluated as follows.

A commercially available anti-glare film in which the anti-glare layer 5 is formed on a 60 μm or 80 μm triacetyl cellulose (TAC) film used as the first protective layer 4 is prepared. Hereinafter, the first protective layer 4 and the antiglare layer 5 formed on the first protective layer 4 may be collectively referred to as a first protective layer with an antiglare layer.

The antiglare property of the antiglare layer increases in the order of Experimental Examples 1-1 to 1-7.
About each 1st protective layer with an anti-glare layer, the haze (Hz) value was measured. The measurement results are shown in Table 1 described later.

In addition to the first protective layer with the antiglare layer, the following materials were used and laminated to produce optical members of Experimental Examples 1-1 to 1-7.
Polarizer layer 2
Patterned retardation layer 3
Second protective layer 6 (60 μm thick triacetyl cellulose (TAC) film)

Adhesive layer

7, 8
Adhesive layer 9

With respect to the obtained optical members of Experimental Examples 1-1 to 1-7, the arithmetic average height (Pa), the maximum cross-sectional height (Pt), and the surface inclination angle (θ) are 2 ° or more by the above method. Ratio, sum of image sharpness (sum of image sharpness 1) measured by reflection method using optical comb (width 0.5 mm, 1.0 mm and 2.0 mm), and optical comb (width 0.125 mm, When the sum of image sharpness (sum of image sharpness 2) measured by the transmission method using 0.5 mm, 1.0 mm, and 2.0 mm) is measured, each value is as shown in Table 1. The maximum value of “sum of image clarity 1” is 300%, and the maximum value of “sum of image clarity 2” is 400%.

(Evaluation)
Test pieces of Experimental Examples 1-1 to 1-7 were obtained by pasting a linearly polarizing plate with the adhesive layer 9 to the produced optical member. In these test pieces, the linearly polarizing plate is bonded to the polarizer layer 2 included in the optical member so that the absorption axes thereof are parallel to each other.

Each test piece mimics the configuration of a liquid crystal display. The polarizer layer 2 included in the optical member corresponds to the viewing-side polarizing plate in the liquid crystal display. The linear polarizing plate bonded to the optical member corresponds to the polarizing plate on the backlight side in the liquid crystal display.

Each of the obtained test pieces is illuminated by a surface light source device that emits white light from the linearly polarizing plate side. In this state, each photo-alignment layer 31a constituting the patterned retardation layer 3 is visually observed from the antiglare layer side and the viewing position is changed in a range from the front direction of the test piece to a direction of about 90 degrees obliquely. , 31b is visually confirmed.

Evaluation results are shown in Table 1 below. In the evaluation results of Table 1, “Good” was obtained for the test piece in which the boundary between the photo-alignment layer 31a and the photo-alignment layer 31b could be clearly observed visually, and the test piece that was confirmed although the boundary was slightly unclear. “Fair”, and the test piece whose boundary was ambiguous and could not be confirmed was indicated as “Bad”.

As a result of the evaluation, the optical members of Experimental Example 1-2 and Experimental Example 1-3 are similar to the optical member of Experimental Example 1-1 in which no antiglare layer is formed. Was confirmed visually. In particular, in the optical member of Experimental Example 1-2, the boundary between the photo-alignment layer 31a and the photo-alignment layer 31b could be clearly and visually confirmed in comparison with Experimental Example 1-1.

In the 3D liquid crystal display device in which such an optical member is bonded to the display surface side of the display panel P, it is possible to display a stereoscopic image with a sense of reality and a stereoscopic effect.

On the other hand, in the optical members of Experimental Example 1-6 and Experimental Example 1-7, the boundary between the photo-alignment layer 31a and the photo-alignment layer 31b could not be visually confirmed. In the 3D liquid crystal display device in which such an optical member is bonded to the display surface side of the display panel P, a stereoscopic image to be displayed lacks a sense of reality and a stereoscopic effect.

[Level 2]
(Preparation of test piece)
The following active energy ray-curable resin was applied onto a 60 μm thick triacetyl cellulose (TAC) film (200 mm × 300 mm) and dried. The obtained coating film was irradiated with ultraviolet rays (UV lamp) from the coated side (the side opposite to the TAC film side) to cure the composition, thereby forming a hard coat layer. The composition was applied such that the thickness of the hard coat layer after curing was about 5 μm.

(Active energy ray curable resin)
UV curable resin 1: pentaerythritol triacrylate (60 parts by mass)
UV curable resin 2: polyfunctional urethanized acrylate (reaction product of hexamethylene diisocyanate and pentaerythritol triacrylate) (40 parts by mass)
Solvent: ethyl acetate (100 parts by mass)
Photopolymerization initiator: “Irgacure 907” (2 parts by mass) manufactured by BASF
Surfactant: BYK-UV 3510 (0.4 parts by mass) manufactured by Big Chemie

At this time, test pieces having pencil hardnesses of 2H (Experimental example 2-1) and 3H (Experimental example 2-2) of the hard coat layer after ultraviolet irradiation were obtained by adjusting the ultraviolet irradiation time. The longer the ultraviolet irradiation time, the higher the pencil hardness of the hard coat layer.

The TAC film used corresponds to the first protective layer 4. The formed hard coat layer corresponds to the hard coat layer 5.

(Evaluation)
The obtained test piece was placed between two orthogonal polarizing plates arranged so that the absorption axes were orthogonal to each other (crossed Nicols arrangement), and illuminated from one orthogonal polarizing plate side using a light source (fluorescent lamp). In that state, the presence / absence and distribution of transmitted light was evaluated by visual observation from the other direct polarizing plate side.

Evaluation results are shown in Table 2 below. In the evaluation results of Table 2, “Good” is obtained for the test piece in which the transmitted light is not bright and dark, “Fair” is given for the test piece in which the light and darkness is slightly observed, ".

As a result of the evaluation, the test piece of Experimental Example 2-1 showed no brightness in the transmitted light. This is probably because birefringence does not occur in the evaluated specimen. In a 3D liquid crystal display device in which such an optical member having the first protective layer 4 and the hard coat layer 5 is bonded to the display surface side of the display panel P, a stereoscopic image with a sense of reality and a stereoscopic effect is preferably displayed. Can do.

On the other hand, in the test piece of Experimental Example 2-2, light and darkness was observed in the transmitted light. This is probably because birefringence occurred in the evaluated specimen. In the 3D liquid crystal display device in which the optical member having the first protective layer 4 and the hard coat layer 5 is bonded to the display surface side of the display panel P, the stereoscopic image to be displayed lacks a sense of reality and a stereoscopic effect. .

[Level 3]
(Preparation of test piece)
Except for changing the thickness of the TAC film, a hard coat layer was formed in the same manner as in Experimental Example 2-1 of Level 2 above, and in Experimental Example 3-1, Experimental Example 3-2, and Experimental Example 3-3 A test piece was prepared. About the thickness of the used TAC film, it shows in Table 3 mentioned later. The test piece of Experimental Example 3-3 is equivalent to the test piece of Experimental Example 2-1.

(Evaluation)
The TAC film before preparation of the test piece (before UV irradiation) is compared with the TAC film after preparation of the test piece (after UV irradiation), and the following two methods are used to determine the presence or absence of wrinkles generated on the TAC film by curing the composition It was evaluated by.

(Evaluation method 1)
Spread the test piece on the desk, place the fluorescent lamp on the ceiling in the specified elevation direction (lighting), and then the image of the fluorescent light that is regularly reflected on the surface of the test piece (fluorescent light) Observe with the naked eye.

(Evaluation method 2)
Fluorescent light on the ceiling (lit) is observed with the naked eye through the test piece.

The evaluation results are shown in Table 3 below.
In the evaluation results of Table 3, the fluorescent lamp image observed in the evaluation method 1 is as clear as the TAC film before coating, and the fluorescent lamp image observed in the evaluation method 2 is coated. As with the previous TAC film, the test piece that was clear without distortion was “Good”.

In the evaluation method 1, an image of a fluorescent lamp could not be observed, but the test piece in which the image of the fluorescent lamp observed in the evaluation method 2 is clear without distortion like the TAC film before coating is “Fair "

In the evaluation method 1, the image of the fluorescent lamp could not be observed, and in the evaluation method 2, the test piece in which the fluorescent lamp image was observed distorted was “Bad”.

評価 Evaluation results of “Good” and “Fair” were accepted, and those of “Bad” were rejected.

As a result of the evaluation, in the test pieces of Experimental Example 3-2 and Experimental Example 3-3, no distortion was observed in the fluorescent lamp image observed in Evaluation Method 2. This is probably because wrinkles that could be visually recognized did not occur in the evaluated test piece. In particular, in the optical member of Experimental Example 3-3, it is considered that the fluorescent lamp image observed by the evaluation method 1 is as clear as the TAC film, and the TAC film has few wrinkles.

In a 3D liquid crystal display device in which such an optical member having the first protective layer 4 and the hard coat layer 5 is bonded to the display surface side of the display panel P, a stereoscopic image with a sense of reality and a stereoscopic effect is preferably displayed. Can do.

On the other hand, in the test piece of Experimental Example 3-1, the image of the fluorescent lamp could not be observed in Evaluation Method 1, and the image of the fluorescent lamp observed in Evaluation Method 2 was distorted. This is probably because the evaluated test piece was wrinkled enough to affect visual recognition. Such first protective layer 4. In the 3D liquid crystal display device in which the optical member having the hard coat layer 5 is bonded to the display surface side of the display panel P, the displayed stereoscopic image lacks a sense of reality and a stereoscopic effect.

DESCRIPTION OF SYMBOLS 1 Optical member 2 Polarizer layer 3 Patterned phase difference layer 4 1st protective layer (retardation layer protective layer)
5 Hard coat layer (antiglare layer)
6 Second protective layer (polarizer layer protective layer)
P Liquid crystal panel (display panel)
32 retardation layer 32a first region 32b second region 100 display device

Claims

A plurality of first regions that change the incident linearly polarized light into a first polarization state; and a plurality of second regions that change into a second polarization state;
A plurality of the first regions and a plurality of the second regions arranged in a predetermined pattern in a plan view;
A polarizer layer provided on one surface side of the retardation layer;
An anti-glare layer provided on the surface of the other surface side of the retardation layer,
An optical member having an arithmetic average height Pa in an arbitrary cross-sectional curve of the uneven surface of the antiglare layer of 0.15 μm or less and a maximum cross-section height Pt of 1.5 μm or less.
The optical member according to claim 1, wherein the ratio of the inclination angle of the surface of the antiglare layer being 2 ° or more is 30% or less.
A plurality of first regions that change the incident linearly polarized light into a first polarization state; and a plurality of second regions that change into a second polarization state;
A plurality of the first regions and a plurality of the second regions arranged in a predetermined pattern in a plan view;
A polarizer layer provided on one surface side of the retardation layer;
An anti-glare layer provided on the surface of the other surface side of the retardation layer,
With respect to the surface of the antiglare layer, the sum of image sharpness measured by a reflection method using optical combs having a width of 0.5 mm, 1.0 mm and 2.0 mm based on JIS K 7374 is 30% or more and 200% or less. An optical member.
The sum of image sharpness measured by the transmission method using optical combs having widths of 0.125 mm, 0.5 mm, 1.0 mm, and 2.0 mm based on JIS K 7374 for light transmitted from the polarizer layer side The optical member according to claim 3, wherein is 150% or more and 350% or less.
A plurality of first regions that change the incident linearly polarized light into a first polarization state; and a plurality of second regions that change into a second polarization state;
A plurality of the first regions and a plurality of the second regions arranged in a predetermined pattern in a plan view;
A polarizer layer provided on one surface side of the retardation layer;
A polarizer layer protective layer provided on the opposite side of the retardation layer with respect to the polarizer layer,
The in-plane retardation R o of the polarizer layer protective layer, the optical member is 10nm or less.
The optical member according to claim 5, wherein the thickness direction retardation R th of the polarizer layer protective layer is 10 nm or less.
The optical member according to claim 5 or 6, wherein the polarizer layer protective layer has an Nz coefficient of 10 or less.
A plurality of first regions that change the incident linearly polarized light into a first polarization state; and a plurality of second regions that change into a second polarization state;
A plurality of the first regions and a plurality of the second regions arranged in a predetermined pattern in a plan view;
A polarizer layer provided on one surface side of the retardation layer;
A hard coat layer provided on the surface of the other surface side of the retardation layer,
The hard member is an optical member having a thickness of 1 μm or more and a pencil hardness of F to 2H.
The optical member according to claim 8, wherein the hard coat layer is a polymer of an active energy ray-curable resin composition.
The optical member according to claim 8 or 9, further comprising a retardation layer protective layer between the retardation layer and the hard coat layer.
A plurality of first regions that change the incident linearly polarized light into a first polarization state; and a plurality of second regions that change into a second polarization state;
A plurality of the first regions and a plurality of the second regions arranged in a predetermined pattern in a plan view;
A polarizer layer provided on one surface side of the retardation layer;
A polarizer layer protective layer provided on the opposite side of the retardation layer with respect to the polarizer layer,
The polarizer layer protective layer is an optical member having a thickness of 5 μm or more and 80 μm or less.
A plurality of first regions that change the incident linearly polarized light into a first polarization state; and a plurality of second regions that change into a second polarization state;
A plurality of the first regions and a plurality of the second regions arranged in a predetermined pattern in a plan view;
A polarizer layer provided on one surface side of the retardation layer;
A hard coat layer provided on the surface of the other side of the retardation layer;
A retardation layer protective layer provided between the retardation layer and the hard coat layer,
The retardation layer protective layer is an optical member having a thickness of 35 μm or more.
A display panel;
A display device comprising: the optical member according to claim 1 provided on a display surface side of the display panel.