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WO2018179772A1 - Reflective liquid crystal cell - Google Patents

Reflective liquid crystal cell Download PDF

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Publication number
WO2018179772A1
WO2018179772A1 PCT/JP2018/002619 JP2018002619W WO2018179772A1 WO 2018179772 A1 WO2018179772 A1 WO 2018179772A1 JP 2018002619 W JP2018002619 W JP 2018002619W WO 2018179772 A1 WO2018179772 A1 WO 2018179772A1
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WO
WIPO (PCT)
Prior art keywords
polarizing plate
liquid crystal
front surface
absorbing layer
crystal cell
Prior art date
Application number
PCT/JP2018/002619
Other languages
French (fr)
Japanese (ja)
Inventor
持塚　多久男
Original Assignee
株式会社村上開明堂
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Publication date
Application filed by 株式会社村上開明堂 filed Critical 株式会社村上開明堂
Priority to JP2019600115U priority Critical patent/JP3225094U/en
Publication of WO2018179772A1 publication Critical patent/WO2018179772A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors

Definitions

  • the present invention relates to a reflective liquid crystal cell.
  • Patent Document 1 describes a liquid crystal antiglare mirror that can be used as a monitor when the power is on and can be used as a mirror when the power is off.
  • the liquid crystal antiglare mirror includes a first polarizing plate (reflective polarizing plate) that reflects incident light, a liquid crystal unit disposed on the front side of the first polarizing plate, and a second plate formed on the front side of the liquid crystal unit. And a polarizing plate (absorptive polarizing plate).
  • the present invention has been made in view of these points, and provides a reflective liquid crystal cell that can reduce the distortion of a reflected image when used as a mirror.
  • the present invention provides a first polarizing plate that reflects incident light, a liquid crystal unit disposed on the front side of the first polarizing plate, and a front side of the liquid crystal unit.
  • a second polarizing plate that transmits a predetermined polarization component to the liquid crystal unit and transmits incident light from the liquid crystal unit, and a transparent waviness absorbing layer made of resin, disposed on the front surface of the second polarizing plate.
  • a cover glass disposed on the front surface of the swell absorbing layer, the swell absorbing layer bonds the second polarizing plate and the cover glass, and swells on the front surface of the second polarizing plate. It is characterized by absorbing.
  • the swell of the front surface of the second polarizing plate is absorbed by the swell absorbing layer, and the front surface of the swell absorbing layer is flattened by the cover glass.
  • the distortion of the reflected image when used as a mirror can be reduced.
  • the present invention provides a first polarizing plate that reflects incident light, a liquid crystal unit disposed on a front side of the first polarizing plate, a front side of the liquid crystal unit, and a predetermined polarization component as the liquid crystal
  • a second polarizing plate that transmits the incident light from the liquid crystal unit and a transparent waviness absorbing layer made of resin and disposed on the front surface of the second polarizing plate, and absorbs the waviness.
  • the layer has a flat front surface and absorbs waviness on the front surface of the second polarizing plate.
  • the waviness of the front surface of the second polarizing plate is absorbed by the waviness absorbing layer, and the front surface of the waviness absorbing layer is flat. Thereby, the distortion of the reflected image when used as a mirror can be reduced.
  • the distortion of the reflected image when used as a mirror can be reduced.
  • FIG. 1 is a perspective view showing a reflective liquid crystal cell and a liquid crystal monitor according to a first embodiment of the present invention. It is sectional drawing which shows the reflection type liquid crystal cell and liquid crystal monitor which concern on 1st embodiment. It is an expanded sectional view showing the 2nd polarizing plate concerning a first embodiment. It is a figure which shows the comparative example of contrast observation, Comprising: (a) is a top view, (b) is sectional drawing. It is a figure which shows the schematic Example of contrast observation, Comprising: (a) is a top view and sectional drawing. It is sectional drawing which shows the reflection type liquid crystal cell which concerns on 2nd embodiment.
  • the reflective liquid crystal cell 1 includes a first polarizing plate 2, a liquid crystal unit 3, a second polarizing plate 4, a swell absorbing layer 5, and a cover glass 6. And is mainly composed.
  • the reflective liquid crystal cell 1 is a plate-like member having a rectangular shape in plan view, and is a member that becomes almost transparent when the liquid crystal unit 3 is energized and functions as a mirror when the energization of the liquid crystal unit 3 is interrupted.
  • a liquid crystal monitor M is disposed on the back surface of the reflective liquid crystal cell 1.
  • a monitor image of a camera or the like can be displayed via the reflective liquid crystal cell 1 in a state where the power of the reflective liquid crystal cell 1 and the liquid crystal monitor M is turned on.
  • the reflective liquid crystal cell 1 can be used for, for example, a smartphone, an electronic mirror for a vehicle, a game machine, and the like by disposing the liquid crystal monitor M on the back surface.
  • the reflective liquid crystal cell 1 can also be used as an antiglare mirror for a vehicle that can adjust the reflectance. Instead of the liquid crystal monitor M, another display device may be arranged.
  • the surface side of the reflective liquid crystal cell 1 that is visually recognized by the user is referred to as “front surface”, and the surface opposite to the “front surface” is referred to as “back surface”.
  • the first polarizing plate (reflective polarizing plate) 2 is a thin film having a rectangular shape in a plan view that transmits any one of orthogonal polarization components and reflects the other.
  • the first polarizing plate 2 is disposed on the most back side in the reflective liquid crystal cell 1.
  • the first polarizing plate 2 may be, for example, a DBEF series reflective polarizing film manufactured by 3M.
  • the plate thickness of the first polarizing plate 2 can be appropriately set between about 50 to 300 ⁇ m, for example. In the present embodiment, the thickness of the first polarizing plate 2 is set to 100 ⁇ m.
  • the size of the undulation (unevenness) of the front surface 2a of the first polarizing plate 2 is, for example, less than 1.0 ⁇ m. . Since the first polarizing plate 2 has a function of reflecting incident light, the size of the undulation of the front surface 2a affects the reflected image. That is, when the undulation of the front surface 2a of the first polarizing plate 2 is large, there is a problem that the outline of the reflected image is blurred. However, since the first polarizing plate 2 is a softer material than the second polarizing plate 4, the first polarizing plate 2 has a property of easily reducing the swell.
  • the liquid crystal unit 3 is a plate-like member disposed on the front surface 2 a of the first polarizing plate 2.
  • the liquid crystal part 3 has substantially the same planar shape as the first polarizing plate 2.
  • the liquid crystal unit 3 functions as a light transmission shutter.
  • the liquid crystal unit 3 is configured by enclosing a liquid crystal between a pair of glass substrates (not shown).
  • the type of the liquid crystal unit 3 is not particularly limited. For example, a TN (Twisted nematic) type liquid crystal can be used.
  • the liquid crystal unit 3 exhibits optical rotation with respect to incident light when no voltage is applied between the transparent electrodes of the glass substrate (non-application).
  • the liquid crystal alignment is such that the optical rotatory power developed when a voltage is applied between the transparent electrodes (application) is eliminated.
  • the second polarizing plate (absorptive polarizing plate) 4 is a thin film member disposed on the front surface 3 a of the liquid crystal unit 3.
  • the second polarizing plate 4 emits a specific polarization component of incident light incident from the front side to the liquid crystal unit 3 as transmitted light and transmits a specific polarization component of incident light incident from the liquid crystal unit 3 to the front side.
  • the second polarizing plate 4 has substantially the same planar shape as the first polarizing plate 2.
  • a polarizing plate manufactured by Polatechno Co., Ltd. can be used as the second polarizing plate 4.
  • undulations irregularities
  • the front surface 4a of the second polarizing plate 4 has a relatively large undulation. Further, “roughness” is formed on the front surface 4a as fine irregularities. For convenience of explanation, the waviness in each figure is drawn larger than the actual dimensions.
  • the undulation size h of the front surface 4a of the second polarizing plate 4 (the difference between the most protruding portion and the most recessed portion in a predetermined length in the plane direction of the polarizing plate) is about 1.0 to 2.5 ⁇ m.
  • the back surface 4b of the second polarizing plate 4 is flattened by being bonded and pressure-bonded to the glass substrate of the liquid crystal unit 3 through an adhesive layer (PSA: Pressure-sensitive adhesive) (not shown).
  • the swell absorbing layer 5 absorbs the undulation and “roughness” of the front surface 4 a of the second polarizing plate 4 and is a transparent curable resin that bonds the second polarizing plate 4 and the cover glass 6. Is a layer. In other words, the swell absorbing layer 5 can enhance the flatness by filling the undulation of the front surface 4a and the unevenness of the “roughness”.
  • OCA Optical Clear Adhesive
  • any of urethane, acrylic and epoxy materials can be used.
  • the thickness of the swell absorbing layer 5 can be appropriately set between 1 and 100 ⁇ m. When the thickness of the swell absorbing layer 5 is less than 1 ⁇ m, it becomes difficult to absorb the swell. Further, when the thickness of the swell absorbing layer 5 exceeds 100 ⁇ m, refraction increases and distortion of the reflected image increases, which is not preferable.
  • the transmittance of the swell absorbing layer 5 is preferably 92% or more.
  • the swell absorbing layer 5 uses OCA.
  • the swell absorbing layer 5 may be a transparent resin layer that absorbs the swell of the front surface 4 a of the second polarizing plate 4 and bonds the second polarizing plate 4 and the cover glass 6. Other materials may be used.
  • the cover glass 6 is a plate-like glass disposed on the front surface 5 a of the swell absorbing layer 5.
  • the cover glass 6 has substantially the same shape as the first polarizing plate 2, the liquid crystal unit 3, the second polarizing plate 4, and the swell absorbing layer 5.
  • the thickness of the cover glass 6 can be appropriately set, for example, between about 0.5 and 2.0 mm. Further, the undulations of the front surface 6a and the back surface 6b of the cover glass 6 are both less than about 1.0 ⁇ m.
  • a frame-shaped decorative portion K is formed on the peripheral edge portion of the front surface 6 a of the cover glass 6.
  • the decorative portion K is colored (for example, black) by printing on the front surface 6a.
  • the reflective liquid crystal cell 1 is formed by laminating layers.
  • the second polarizing plate 4, the swell absorbing layer 5 and the cover glass 6 are laminated with each other and then integrated by a roller means or a pressing means (vacuum pressing means). Further, when the swell absorbing layer 5 is formed, it may be sprayed with a spray to form a flat layer by laminating thin layers.
  • FIG. 4A and 4B are diagrams illustrating a comparative example of contrast observation, in which FIG. 4A is a plan view and FIG. 4B is a cross-sectional view.
  • FIG. 5 is a diagram showing a schematic example of contrast observation, in which (a) is a plan view and a sectional view.
  • Comparative Example 10 is configured by laminating the first polarizing plate 2 and the second polarizing plate 4 from the back side.
  • the model Example 20 is the 1st polarizing plate 2, the 2nd polarizing plate 4, the waviness absorption layer 5, and the cover glass 6 from the back side. It consists of For convenience of comparison observation, neither the comparative example 10 nor the schematic example 20 is provided with the liquid crystal part 3.
  • Comparative Example 10 and Schematic Example 20 were arranged side by side on a table, and a reflection image of a fluorescent lamp lit on the ceiling was observed.
  • the bands extending vertically in FIGS. 4A and 5A are the reflected images N1 and N2 of the fluorescent lamp. That is, the reflection images N1 and N2 shown in the comparative example 10 and the schematic example 20 are images of the same fluorescent lamp.
  • the outline of the reflected image N1 of the fluorescent lamp is distorted.
  • the outline of the reflected image N1 is blurred and blurred. This is considered to be the distortion of the reflected image N1 due to the undulation and “roughness” of the front surface 4a of the second polarizing plate 4 of Comparative Example 10.
  • the outline of the reflected image N2 of the fluorescent lamp is not distorted.
  • the outline of the reflected image N1 is sharp. That is, the waviness and “roughness” of the front surface 4 a of the second polarizing plate 4 are absorbed by the waviness absorbing layer 5, and the front surface 5 a of the waviness absorbing layer 5 is also flattened by the cover glass 6. It is thought that distortion can be reduced.
  • the waviness and “roughness” of the front surface 4 a of the second polarizing plate 4 are absorbed by the waviness absorbing layer 5, and the front surface 5 a of the waviness absorbing layer 5 is bonded to the cover glass 6. Therefore, it becomes a small flat surface such as a swell.
  • a clear image can be displayed when the reflective liquid crystal cell 1 is used as a monitor, and distortion of the reflected image when the reflective liquid crystal cell 1 is used as a mirror can be reduced.
  • the frame-shaped decoration part K is formed in the peripheral part of the cover glass 6, the design property of the reflective liquid crystal cell 1 can be improved. Further, the decorative portion K can cover the frame-shaped weir member, the power feeding unit, and the liquid crystal injection port (not shown) provided on the outer peripheral edge of the liquid crystal unit 3.
  • the waviness of the second polarizing plate 4 of this embodiment is larger than the waviness of the first polarizing plate 2.
  • the size of the undulation is less than 1.0 ⁇ m.
  • the waviness of the front surface of the second polarizing plate is approximately 1.0 ⁇ m or more.
  • the second polarizing plate When the second polarizing plate is simply used for a liquid crystal monitor, the second polarizing plate only transmits incident light, and thus the undulation on the front surface of the second polarizing plate does not significantly affect the displayed image. Therefore, if the current second polarizing plate is used only for a liquid crystal monitor, the displayed image is not greatly affected even if the undulation of the front surface of the second polarizing plate is 1.0 ⁇ m or more.
  • the function as a mirror is developed as in this embodiment, if the waviness of the second polarizing plate is large, the outline of the reflected image N1 is distorted as shown in FIG. There is a problem that it cannot be used as a mirror.
  • it is desired to clarify the reflected image because it relates to the rearward confirmation of the vehicle.
  • the second polarizing plate is a harder material than the first polarizing plate, it is difficult to eliminate the waviness on the front surface by pressing means or the like.
  • the present invention has reached the idea of absorbing the undulation of the front surface 4a of the second polarizing plate 4 by providing the undulation absorbing layer 5. That is, the undulation and “roughness” of the front surface 4 a of the second polarizing plate 4 are filled with the swell absorbing layer 5.
  • the subject of this invention is a subject peculiar to this invention which generate
  • the reflective liquid crystal cell 1A includes a first polarizing plate 2, a liquid crystal unit 3, a second polarizing plate 4, and a swell absorbing layer 5 ⁇ / b> A. That is, the reflective liquid crystal cell 1A is different from the first embodiment in that the cover glass 6 is not disposed.
  • the first polarizing plate 2, the liquid crystal unit 3, and the second polarizing plate 4 of the reflective liquid crystal cell 1A are the same as those in the first embodiment.
  • the waviness absorbing layer 5A is a transparent resin layer that absorbs waviness on the front surface 4a of the second polarizing plate 4 and has a flat front surface 5a.
  • the waviness absorbing layer 5 ⁇ / b> A is bonded to the second polarizing plate 4.
  • the front surface 5a of the waviness absorbing layer 5A is flattened by waviness being eliminated by roller means or pressing means.
  • the undulation of the front surface 5a is less than 1.0 ⁇ m.
  • the reflection-type liquid crystal cell 1A according to the second embodiment formed in this way can provide substantially the same effect as the first embodiment. That is, the cover glass 6 may be omitted as in the second embodiment, and the swell absorbing layer 5A may be exposed. Even in this case, since the undulation of the front surface 5a of the swell absorbing layer 5A is small and flat, the distortion of the reflected image when the reflective liquid crystal cell 1A is used as a mirror can be reduced. Further, since the second polarizing plate 4 is a relatively hard material, it is difficult to flatten the front surface 4a. However, since the swell absorbing layer 5A is a relatively soft material, the undulation of the front surface 5a of the swell absorbing layer 5A.
  • the flatness can be easily increased by reducing the thickness.
  • the reflection type liquid crystal cell 1A according to the second embodiment was also observed in the same manner as in the first embodiment, but the reflected image N2 ((a of FIG. As in (), the reflection image was small in distortion.
  • a hard coat layer may be provided by applying a coating for suppressing surface reflection.
  • first polarizing plate (reflective polarizing plate) 3 Liquid crystal part 4 Second polarizing plate (absorptive polarizing plate) 5 Swell absorption layer 6 Cover glass

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Liquid Crystal (AREA)
  • Polarising Elements (AREA)

Abstract

This reflective liquid crystal cell is characterized by comprising: a first polarizing plate (2) which transmits one of polarization components that are perpendicular to each other, while reflecting the other; a liquid crystal unit (3) which is arranged on the front surface (2a) side of the first polarizing plate (2); a second polarizing plate (4) which is arranged on the front surface (3a) side of the liquid crystal unit (3), and which transmits a specific polarization component of incident light incident thereon to the liquid crystal unit (3), while transmitting the incident light from the liquid crystal unit (3); a transparent heave absorption layer (5) which is formed from a resin and is arranged on the front surface (4a) of the second polarizing plate (4); and a cover glass (6) which is arranged on the front surface (5a) of the heave absorption layer (5). This reflective liquid crystal cell is also characterized in that the heave absorption layer (5) bonds the second polarizing plate (4) and the cover glass (6) to each other and absorbs heaves of the front surface (4a) of the second polarizing plate (4).

Description

反射型液晶セルReflective liquid crystal cell
　本発明は、反射型液晶セルに関する。 The present invention relates to a reflective liquid crystal cell.
　特許文献１には、電源ＯＮの状態でモニターとして利用することができるとともに、電源ＯＦＦの状態で鏡として利用することができる液晶防眩ミラーが記載されている。当該液晶防眩ミラーは、入射光を反射させる第一偏光板（反射型偏光板）と、第一偏光板の前面側に配置された液晶部と、液晶部の前面側に形成された第二偏光板（吸収型偏光板）とを含んで構成されている。 Patent Document 1 describes a liquid crystal antiglare mirror that can be used as a monitor when the power is on and can be used as a mirror when the power is off. The liquid crystal antiglare mirror includes a first polarizing plate (reflective polarizing plate) that reflects incident light, a liquid crystal unit disposed on the front side of the first polarizing plate, and a second plate formed on the front side of the liquid crystal unit. And a polarizing plate (absorptive polarizing plate).
特開２００９－８８８１号公報JP 2009-8881 A
　特許文献１に記載の発明では、第二偏光板の前面のうねりが大きいため、電源をＯＦＦにして鏡として利用した場合に、通常の鏡と比較して反射像の歪みが大きいという問題がある。 In the invention described in Patent Document 1, since the waviness of the front surface of the second polarizing plate is large, there is a problem that the distortion of the reflected image is larger than that of a normal mirror when the power is turned off and the mirror is used as a mirror. .
　本発明は、このような点に鑑みてなされたものであり、鏡として利用した場合に反射像の歪みを小さくすることができる反射型液晶セルを提供するものである。 The present invention has been made in view of these points, and provides a reflective liquid crystal cell that can reduce the distortion of a reflected image when used as a mirror.
　前記した歪みの課題を解決するために、本発明は、入射光を反射させる第一偏光板と、前記第一偏光板の前面側に配置された液晶部と、前記液晶部の前面側に配置され、所定の偏光成分を前記液晶部に透過させるとともに、前記液晶部からの入射光を透過させる第二偏光板と、前記第二偏光板の前面に配置され、樹脂製の透明なうねり吸収層と、前記うねり吸収層の前面に配置されたカバーガラスと、を有し、前記うねり吸収層は、前記第二偏光板と前記カバーガラスとを接着するとともに、前記第二偏光板の前面のうねりを吸収することを特徴とする。 In order to solve the above-described distortion problem, the present invention provides a first polarizing plate that reflects incident light, a liquid crystal unit disposed on the front side of the first polarizing plate, and a front side of the liquid crystal unit. A second polarizing plate that transmits a predetermined polarization component to the liquid crystal unit and transmits incident light from the liquid crystal unit, and a transparent waviness absorbing layer made of resin, disposed on the front surface of the second polarizing plate. And a cover glass disposed on the front surface of the swell absorbing layer, the swell absorbing layer bonds the second polarizing plate and the cover glass, and swells on the front surface of the second polarizing plate. It is characterized by absorbing.
　かかる構成によれば、うねり吸収層によって第二偏光板の前面のうねりが吸収されるとともに、うねり吸収層の前面はカバーガラスによって平坦となる。これにより、鏡として利用した場合の反射像の歪みを小さくすることができる。 According to this configuration, the swell of the front surface of the second polarizing plate is absorbed by the swell absorbing layer, and the front surface of the swell absorbing layer is flattened by the cover glass. Thereby, the distortion of the reflected image when used as a mirror can be reduced.
　また、本発明は、入射光を反射させる第一偏光板と、前記第一偏光板の前面側に配置された液晶部と、前記液晶部の前面側に配置され、所定の偏光成分を前記液晶部に透過させるとともに、前記液晶部からの入射光を透過させる第二偏光板と、前記第二偏光板の前面に配置され、樹脂製の透明なうねり吸収層と、を有し、前記うねり吸収層は、前面が平坦に形成されるとともに、前記第二偏光板の前面のうねりを吸収することを特徴とする。 In addition, the present invention provides a first polarizing plate that reflects incident light, a liquid crystal unit disposed on a front side of the first polarizing plate, a front side of the liquid crystal unit, and a predetermined polarization component as the liquid crystal A second polarizing plate that transmits the incident light from the liquid crystal unit and a transparent waviness absorbing layer made of resin and disposed on the front surface of the second polarizing plate, and absorbs the waviness. The layer has a flat front surface and absorbs waviness on the front surface of the second polarizing plate.
　かかる構成によれば、うねり吸収層によって第二偏光板の前面のうねりが吸収されるとともに、うねり吸収層の前面は平坦になっている。これにより、鏡として利用した場合の反射像の歪みを小さくすることができる。 According to this configuration, the waviness of the front surface of the second polarizing plate is absorbed by the waviness absorbing layer, and the front surface of the waviness absorbing layer is flat. Thereby, the distortion of the reflected image when used as a mirror can be reduced.
　本発明の反射型液晶セルによれば、鏡として利用した場合の反射像の歪みを小さくすることができる。 According to the reflective liquid crystal cell of the present invention, the distortion of the reflected image when used as a mirror can be reduced.
本発明の第一実施形態に係る反射型液晶セル及び液晶モニタを示す斜視図である。1 is a perspective view showing a reflective liquid crystal cell and a liquid crystal monitor according to a first embodiment of the present invention. 第一実施形態に係る反射型液晶セル及び液晶モニタを示す断面図である。It is sectional drawing which shows the reflection type liquid crystal cell and liquid crystal monitor which concern on 1st embodiment. 第一実施形態に係る第二偏光板を示す拡大断面図である。It is an expanded sectional view showing the 2nd polarizing plate concerning a first embodiment. 対比観察の比較例を示す図であって、（ａ）は平面図であり、（ｂ）は断面図である。It is a figure which shows the comparative example of contrast observation, Comprising: (a) is a top view, (b) is sectional drawing. 対比観察の模式実施例を示す図であって、（ａ）は平面図であり、断面図である。It is a figure which shows the schematic Example of contrast observation, Comprising: (a) is a top view and sectional drawing. 第二実施形態に係る反射型液晶セルを示す断面図である。It is sectional drawing which shows the reflection type liquid crystal cell which concerns on 2nd embodiment.
［第一実施形態］
　本発明の第一実施形態に係る反射型液晶セルを図面を用いて説明する。本実施形態に係る反射型液晶セル１は、図１及び図２に示すように、第一偏光板２と、液晶部３と、第二偏光板４と、うねり吸収層５と、カバーガラス６とで主に構成されている。 [First embodiment]
A reflective liquid crystal cell according to a first embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the reflective liquid crystal cell 1 according to this embodiment includes a first polarizing plate 2, a liquid crystal unit 3, a second polarizing plate 4, a swell absorbing layer 5, and a cover glass 6. And is mainly composed.
　反射型液晶セル１は、平面視矩形を呈する板状部材であって、液晶部３に通電させることによりほぼ透明になり、液晶部３への通電を遮断すると鏡として機能する部材である。反射型液晶セル１の背面には、例えば、液晶モニタＭを配置する。反射型液晶セル１及び液晶モニタＭの電源ＯＮの状態でカメラなどのモニタ画像を反射型液晶セル１を介して表示することができる。反射型液晶セル１は、背面に液晶モニタＭを配置することで、例えば、スマートフォン、車両用電子ミラー、ゲーム機等に用いることができる。また、反射型液晶セル１は、反射率を調整可能な車両用の防眩ミラーとして使用することもできる。なお、液晶モニタＭに代えて、他の表示装置を配置してもよい。反射型液晶セル１のうちユーザーが視認する面側を「前面」とし、「前面」とは反対側の面を「背面」とする。 The reflective liquid crystal cell 1 is a plate-like member having a rectangular shape in plan view, and is a member that becomes almost transparent when the liquid crystal unit 3 is energized and functions as a mirror when the energization of the liquid crystal unit 3 is interrupted. For example, a liquid crystal monitor M is disposed on the back surface of the reflective liquid crystal cell 1. A monitor image of a camera or the like can be displayed via the reflective liquid crystal cell 1 in a state where the power of the reflective liquid crystal cell 1 and the liquid crystal monitor M is turned on. The reflective liquid crystal cell 1 can be used for, for example, a smartphone, an electronic mirror for a vehicle, a game machine, and the like by disposing the liquid crystal monitor M on the back surface. The reflective liquid crystal cell 1 can also be used as an antiglare mirror for a vehicle that can adjust the reflectance. Instead of the liquid crystal monitor M, another display device may be arranged. The surface side of the reflective liquid crystal cell 1 that is visually recognized by the user is referred to as “front surface”, and the surface opposite to the “front surface” is referred to as “back surface”.
　第一偏光板（反射型偏光板）２は、直交する偏光成分のいずれか一方を透過させるとともに他方を反射させる平面視矩形の薄膜状フィルムである。第一偏光板２は、反射型液晶セル１の中で最も背面側に配置される。第一偏光板２は、例えば、スリーエム社製のＤＢＥＦシリーズの反射型偏光フィルムを用いることができる。第一偏光板２の板厚は、例えば、約５０～３００μｍの間で適宜設定することができる。本実施形態では、第一偏光板２の板厚を１００μｍに設定している。 The first polarizing plate (reflective polarizing plate) 2 is a thin film having a rectangular shape in a plan view that transmits any one of orthogonal polarization components and reflects the other. The first polarizing plate 2 is disposed on the most back side in the reflective liquid crystal cell 1. The first polarizing plate 2 may be, for example, a DBEF series reflective polarizing film manufactured by 3M. The plate thickness of the first polarizing plate 2 can be appropriately set between about 50 to 300 μm, for example. In the present embodiment, the thickness of the first polarizing plate 2 is set to 100 μm.
　第一偏光板２の前面２ａのうねり（凸凹）の大きさ（偏光板の面方向の所定長における最も突出した部分と最も凹んだ部分の差）は、例えば、１．０μｍ未満になっている。第一偏光板２は、入射光を反射させる機能を備えるため、前面２ａのうねりの大きさが反射像に影響する。つまり、第一偏光板２の前面２ａのうねりが大きいと、反射像の輪郭がぼやけるという不具合が発生する。しかし、第一偏光板２は、第二偏光板４に比べて軟らかい材料であるため、うねりを小さくしやすいという性質を備えている。 The size of the undulation (unevenness) of the front surface 2a of the first polarizing plate 2 (the difference between the most protruding portion and the most recessed portion in a predetermined length in the plane direction of the polarizing plate) is, for example, less than 1.0 μm. . Since the first polarizing plate 2 has a function of reflecting incident light, the size of the undulation of the front surface 2a affects the reflected image. That is, when the undulation of the front surface 2a of the first polarizing plate 2 is large, there is a problem that the outline of the reflected image is blurred. However, since the first polarizing plate 2 is a softer material than the second polarizing plate 4, the first polarizing plate 2 has a property of easily reducing the swell.
　液晶部３は、第一偏光板２の前面２ａに配置された板状部材である。液晶部３は、第一偏光板２と概ね同じ平面形状になっている。液晶部３は、光の透過のシャッターとして機能する。液晶部３は、一対のガラス基板（図示省略）の間に液晶を封入して構成されている。液晶部３の種類は特に限定されないが、例えば、ＴＮ（Twisted nematic）型液晶を用いることができる。液晶部３は、ガラス基板の透明電極間に電圧を印加しないとき（非印加）に入射光に対して旋光性を発現する。一方、透明電極間に電圧を印加したとき（印加）に発現していた旋光性が解消する液晶配列になっている。 The liquid crystal unit 3 is a plate-like member disposed on the front surface 2 a of the first polarizing plate 2. The liquid crystal part 3 has substantially the same planar shape as the first polarizing plate 2. The liquid crystal unit 3 functions as a light transmission shutter. The liquid crystal unit 3 is configured by enclosing a liquid crystal between a pair of glass substrates (not shown). The type of the liquid crystal unit 3 is not particularly limited. For example, a TN (Twisted nematic) type liquid crystal can be used. The liquid crystal unit 3 exhibits optical rotation with respect to incident light when no voltage is applied between the transparent electrodes of the glass substrate (non-application). On the other hand, the liquid crystal alignment is such that the optical rotatory power developed when a voltage is applied between the transparent electrodes (application) is eliminated.
　第二偏光板（吸収型偏光板）４は、液晶部３の前面３ａに配置された薄膜状部材である。第二偏光板４は、前面側から入射した入射光の特定の偏光成分を透過光として液晶部３に射出させるとともに、液晶部３から入射される入射光の特定の偏光成分を前面側に透過させる。第二偏光板４は、第一偏光板２と概ね同じ平面形状になっている。第二偏光板４は、例えば、ポラテクノ社製の偏光板を用いることができる。第二偏光板４の前面４ａには、うねり（凸凹）が形成されている。 The second polarizing plate (absorptive polarizing plate) 4 is a thin film member disposed on the front surface 3 a of the liquid crystal unit 3. The second polarizing plate 4 emits a specific polarization component of incident light incident from the front side to the liquid crystal unit 3 as transmitted light and transmits a specific polarization component of incident light incident from the liquid crystal unit 3 to the front side. Let The second polarizing plate 4 has substantially the same planar shape as the first polarizing plate 2. For example, a polarizing plate manufactured by Polatechno Co., Ltd. can be used as the second polarizing plate 4. On the front surface 4 a of the second polarizing plate 4, undulations (irregularities) are formed.
　図３に示すように、第二偏光板４の前面４ａは比較的大きな凸凹であるうねりが形成されている。また、前面４ａには微細な凸凹となる「荒さ」が形成されている。なお、説明の便宜上、各図のうねりは実際の寸法よりも大きく描画している。第二偏光板４の前面４ａのうねりの大きさｈ（偏光板の面方向の所定長における最も突出した部分と最も凹んだ部分の差）は約１．０～２．５μｍになっている。第二偏光板４の背面４ｂは、粘着層（PSA：Pressure Sensitive Adhesive　図示省略）を介して液晶部３のガラス基板に接着されるとともに圧着されることで平坦になっている。 As shown in FIG. 3, the front surface 4a of the second polarizing plate 4 has a relatively large undulation. Further, “roughness” is formed on the front surface 4a as fine irregularities. For convenience of explanation, the waviness in each figure is drawn larger than the actual dimensions. The undulation size h of the front surface 4a of the second polarizing plate 4 (the difference between the most protruding portion and the most recessed portion in a predetermined length in the plane direction of the polarizing plate) is about 1.0 to 2.5 μm. The back surface 4b of the second polarizing plate 4 is flattened by being bonded and pressure-bonded to the glass substrate of the liquid crystal unit 3 through an adhesive layer (PSA: Pressure-sensitive adhesive) (not shown).
　うねり吸収層５は、図２に示すように、第二偏光板４の前面４ａのうねり及び「荒さ」を吸収するともに、第二偏光板４とカバーガラス６とを接着する透明な硬化性樹脂層である。言い換えると、うねり吸収層５は、前面４ａのうねり及び「荒さ」の凸凹を埋めることにより平坦性を高めることができる。うねり吸収層５は、例えば、日栄化工社製のＯＣＡ（Optical Clear Adhesive）：品番ＭＨＭ＝ＦＷＤ１００を用いることができる。ＯＣＡは、ウレタン系、アクリル系、エポキシ系材料のいずれかを用いることができる。 As shown in FIG. 2, the swell absorbing layer 5 absorbs the undulation and “roughness” of the front surface 4 a of the second polarizing plate 4 and is a transparent curable resin that bonds the second polarizing plate 4 and the cover glass 6. Is a layer. In other words, the swell absorbing layer 5 can enhance the flatness by filling the undulation of the front surface 4a and the unevenness of the “roughness”. For the swell absorption layer 5, for example, OCA (Optical Clear Adhesive) manufactured by Nichiei Kako Co., Ltd .: product number MHM = FWD100 can be used. As the OCA, any of urethane, acrylic and epoxy materials can be used.
　うねり吸収層５の厚さは、１～１００μｍの間で適宜設定することができる。うねり吸収層５の厚さが１μｍ未満であると、うねりを吸収することが困難となる。また、うねり吸収層５の厚さが１００μｍを超えると屈折が多くなり、反射像の歪みが大きくなるため好ましくない。うねり吸収層５の透過率は９２％以上であることが好ましい。うねり吸収層５は、本実施形態ではＯＣＡを用いたが、第二偏光板４の前面４ａのうねりを吸収するともに、第二偏光板４とカバーガラス６とを接着する透明な樹脂層であれば他の材料でもよい。 The thickness of the swell absorbing layer 5 can be appropriately set between 1 and 100 μm. When the thickness of the swell absorbing layer 5 is less than 1 μm, it becomes difficult to absorb the swell. Further, when the thickness of the swell absorbing layer 5 exceeds 100 μm, refraction increases and distortion of the reflected image increases, which is not preferable. The transmittance of the swell absorbing layer 5 is preferably 92% or more. In this embodiment, the swell absorbing layer 5 uses OCA. However, the swell absorbing layer 5 may be a transparent resin layer that absorbs the swell of the front surface 4 a of the second polarizing plate 4 and bonds the second polarizing plate 4 and the cover glass 6. Other materials may be used.
　カバーガラス６は、うねり吸収層５の前面５ａに配置された板状のガラスである。カバーガラス６は、第一偏光板２、液晶部３、第二偏光板４及びうねり吸収層５と概ね同じ形状になっている。カバーガラス６の板厚は、例えば、約０．５～２．０ｍｍの間で適宜設定することができる。また、カバーガラス６の前面６ａのうねり及び背面６ｂのうねりの大きさはいずれも約１．０μｍ未満になっている。図１に示すように、カバーガラス６の前面６ａの周縁部には枠状の加飾部Ｋが形成されている。加飾部Ｋは、前面６ａにおいて印刷により色付け（例えば、黒色）されている。 The cover glass 6 is a plate-like glass disposed on the front surface 5 a of the swell absorbing layer 5. The cover glass 6 has substantially the same shape as the first polarizing plate 2, the liquid crystal unit 3, the second polarizing plate 4, and the swell absorbing layer 5. The thickness of the cover glass 6 can be appropriately set, for example, between about 0.5 and 2.0 mm. Further, the undulations of the front surface 6a and the back surface 6b of the cover glass 6 are both less than about 1.0 μm. As shown in FIG. 1, a frame-shaped decorative portion K is formed on the peripheral edge portion of the front surface 6 a of the cover glass 6. The decorative portion K is colored (for example, black) by printing on the front surface 6a.
　反射型液晶セル１は、各層を積層させて形成する。第二偏光板４、うねり吸収層５及びカバーガラス６は、各層を積層させた後、ローラー手段又はプレス手段（真空プレス手段）等によって一体化させる。また、うねり吸収層５を形成する際には、スプレーで吹きかけて薄い層状のものを重ねて平坦に形成してもよい。 The reflective liquid crystal cell 1 is formed by laminating layers. The second polarizing plate 4, the swell absorbing layer 5 and the cover glass 6 are laminated with each other and then integrated by a roller means or a pressing means (vacuum pressing means). Further, when the swell absorbing layer 5 is formed, it may be sprayed with a spray to form a flat layer by laminating thin layers.
　＜対比観察＞
　反射型液晶セル１の模式実施例と比較例とを用いて反射像の対比を行った。図４は、対比観察の比較例を示す図であって、（ａ）は平面図であり、（ｂ）は断面図である。
図５は、対比観察の模式実施例を示す図であって、（ａ）は平面図であり、断面図である。 <Contrast observation>
Reflected images were compared using the schematic examples and comparative examples of the reflective liquid crystal cell 1. 4A and 4B are diagrams illustrating a comparative example of contrast observation, in which FIG. 4A is a plan view and FIG. 4B is a cross-sectional view.
FIG. 5 is a diagram showing a schematic example of contrast observation, in which (a) is a plan view and a sectional view.
　図４の（ａ）及び（ｂ）に示すように、比較例１０は、背面側から第一偏光板２と、第二偏光板４とを積層させて構成されている。一方、図５の（ａ）及び（ｂ）に示すように、模式実施例２０は、背面側から第一偏光板２と、第二偏光板４と、うねり吸収層５と、カバーガラス６とで構成されている。対比観察の便宜上、比較例１０及び模式実施例２０とも液晶部３は配置していない。 4A and 4B, Comparative Example 10 is configured by laminating the first polarizing plate 2 and the second polarizing plate 4 from the back side. On the other hand, as shown to (a) and (b) of FIG. 5, the model Example 20 is the 1st polarizing plate 2, the 2nd polarizing plate 4, the waviness absorption layer 5, and the cover glass 6 from the back side. It consists of For convenience of comparison observation, neither the comparative example 10 nor the schematic example 20 is provided with the liquid crystal part 3.
　当該対比観察では、台の上に比較例１０及び模式実施例２０を並べて配置し、天井に点灯する蛍光灯の反射像を観察した。図４（ａ）及び図５（ａ）の縦に伸びる帯は蛍光灯の反射像Ｎ１，Ｎ２である。つまり、比較例１０及び模式実施例２０に写っている反射像Ｎ１，Ｎ２は同じ蛍光灯の像である。 In this comparative observation, Comparative Example 10 and Schematic Example 20 were arranged side by side on a table, and a reflection image of a fluorescent lamp lit on the ceiling was observed. The bands extending vertically in FIGS. 4A and 5A are the reflected images N1 and N2 of the fluorescent lamp. That is, the reflection images N1 and N2 shown in the comparative example 10 and the schematic example 20 are images of the same fluorescent lamp.
　図４の（ａ）に示すように、うねり吸収層５及びカバーガラス６が配置されていない比較例１０では、蛍光灯の反射像Ｎ１の輪郭が歪んでいる。言い換えると、反射像Ｎ１の輪郭が滲んでぼやけたようになっている。これは、比較例１０の第二偏光板４の前面４ａのうねり及び「荒さ」に起因して反射像Ｎ１の歪みになっていると考えられる。 As shown in FIG. 4A, in Comparative Example 10 in which the swell absorbing layer 5 and the cover glass 6 are not disposed, the outline of the reflected image N1 of the fluorescent lamp is distorted. In other words, the outline of the reflected image N1 is blurred and blurred. This is considered to be the distortion of the reflected image N1 due to the undulation and “roughness” of the front surface 4a of the second polarizing plate 4 of Comparative Example 10.
　一方、図５（ａ）に示すように、うねり吸収層５及びカバーガラス６が配置されている模式実施例２０では、蛍光灯の反射像Ｎ２の輪郭が歪んでいない。言い換えると、反射像Ｎ１の輪郭がシャープになっている。つまり、うねり吸収層５で第二偏光板４の前面４ａのうねり及び「荒さ」が吸収されるとともに、カバーガラス６によってうねり吸収層５の前面５ａも平坦になっているため、反射像Ｎ２の歪みを小さくすることができると考えられる。 On the other hand, as shown in FIG. 5A, in the schematic example 20 in which the swell absorbing layer 5 and the cover glass 6 are arranged, the outline of the reflected image N2 of the fluorescent lamp is not distorted. In other words, the outline of the reflected image N1 is sharp. That is, the waviness and “roughness” of the front surface 4 a of the second polarizing plate 4 are absorbed by the waviness absorbing layer 5, and the front surface 5 a of the waviness absorbing layer 5 is also flattened by the cover glass 6. It is thought that distortion can be reduced.
　以上説明した反射型液晶セル１によれば、うねり吸収層５によって第二偏光板４の前面４ａのうねり及び「荒さ」が吸収されるとともに、うねり吸収層５の前面５ａがカバーガラス６と接着するためうねり等の小さい平坦面となる。これにより、反射型液晶セル１をモニターとして利用した場合にきれいな画像を表示できるとともに、反射型液晶セル１を鏡として利用した場合の反射像の歪みを小さくすることができる。 According to the reflective liquid crystal cell 1 described above, the waviness and “roughness” of the front surface 4 a of the second polarizing plate 4 are absorbed by the waviness absorbing layer 5, and the front surface 5 a of the waviness absorbing layer 5 is bonded to the cover glass 6. Therefore, it becomes a small flat surface such as a swell. Thus, a clear image can be displayed when the reflective liquid crystal cell 1 is used as a monitor, and distortion of the reflected image when the reflective liquid crystal cell 1 is used as a mirror can be reduced.
　また、本実施形態では、カバーガラス６の周縁部に枠状の加飾部Ｋが形成されているため、反射型液晶セル１の意匠性を高めることができる。また、加飾部Ｋによって液晶部３の外周縁に設けられる枠状の堰部材、給電部、及び液晶の注入口（図示省略）を覆うことができる。 Moreover, in this embodiment, since the frame-shaped decoration part K is formed in the peripheral part of the cover glass 6, the design property of the reflective liquid crystal cell 1 can be improved. Further, the decorative portion K can cover the frame-shaped weir member, the power feeding unit, and the liquid crystal injection port (not shown) provided on the outer peripheral edge of the liquid crystal unit 3.
　また、本実施形態の第二偏光板４のうねりは、第一偏光板２のうねりよりも大きくなっている。前記したように、第一偏光板２は軟らかい材料であり、うねりを小さくしやすいため、うねりの大きさは１．０μｍ未満になっている。 Further, the waviness of the second polarizing plate 4 of this embodiment is larger than the waviness of the first polarizing plate 2. As described above, since the first polarizing plate 2 is a soft material and can easily reduce the undulation, the size of the undulation is less than 1.0 μm.
　一方、第二偏光板（吸収型偏光板）の前面のうねりは、概ね１．０μｍ以上になっている。第二偏光板を単に液晶モニタに使用する場合、第二偏光板は入射光を透過させるだけであるため、第二偏光板の前面のうねりは表示される画像に大きな影響はない。したがって、現状の第二偏光板を液晶モニタ用としてのみ用いる分には、第二偏光板の前面のうねりが１．０μｍ以上であっても表示される画像に大きな影響はない。 On the other hand, the waviness of the front surface of the second polarizing plate (absorption type polarizing plate) is approximately 1.0 μm or more. When the second polarizing plate is simply used for a liquid crystal monitor, the second polarizing plate only transmits incident light, and thus the undulation on the front surface of the second polarizing plate does not significantly affect the displayed image. Therefore, if the current second polarizing plate is used only for a liquid crystal monitor, the displayed image is not greatly affected even if the undulation of the front surface of the second polarizing plate is 1.0 μm or more.
　しかしながら、本実施形態のように、鏡としての機能を発現させる場合、第二偏光板のうねりが大きいと、図４の（ａ）に示すように、反射像Ｎ１の輪郭が歪んでしまうため実質的に鏡として用いることができないという問題がある。特に車両のインナーミラー部分の電子ミラーとして用いる場合、車両の後方確認等に関連するので反射像の鮮明化が望まれる。
　ここで、第二偏光板（吸収型偏光板）の前面及び背面を、例えば、プレス手段やローラ手段によって平坦にすることにより、第二偏光板のうねりを小さくすることが考えられる。しかし、第二偏光板は、第一偏光板に比べて硬い材料であるため、プレス手段等で前面のうねりを解消することは困難である。 However, when the function as a mirror is developed as in this embodiment, if the waviness of the second polarizing plate is large, the outline of the reflected image N1 is distorted as shown in FIG. There is a problem that it cannot be used as a mirror. In particular, when used as an electronic mirror of an inner mirror portion of a vehicle, it is desired to clarify the reflected image because it relates to the rearward confirmation of the vehicle.
Here, it is conceivable to reduce the waviness of the second polarizing plate by flattening the front and back surfaces of the second polarizing plate (absorption-type polarizing plate), for example, by pressing means or roller means. However, since the second polarizing plate is a harder material than the first polarizing plate, it is difficult to eliminate the waviness on the front surface by pressing means or the like.
　このような課題に鑑み、本願発明では、うねり吸収層５を設けることによって、第二偏光板４の前面４ａのうねりを吸収するという思想に到達したものである。つまり、うねり吸収層５によって、第二偏光板４の前面４ａのうねり及び「荒さ」を埋めるというものである。本願発明の課題は、反射型液晶セルを鏡として用いる場合に発生する本願発明特有の課題である。 In view of such a problem, the present invention has reached the idea of absorbing the undulation of the front surface 4a of the second polarizing plate 4 by providing the undulation absorbing layer 5. That is, the undulation and “roughness” of the front surface 4 a of the second polarizing plate 4 are filled with the swell absorbing layer 5. The subject of this invention is a subject peculiar to this invention which generate | occur | produces when a reflection type liquid crystal cell is used as a mirror.
［第二実施形態］
　次に、本発明の第二実施形態に係る反射型液晶セル１Ａについて説明する。図６に示すように、反射型液晶セル１Ａは、第一偏光板２と、液晶部３と、第二偏光板４と、うねり吸収層５Ａとで構成されている。つまり、反射型液晶セル１Ａは、カバーガラス６が配置されていない点で、第一実施形態と相違する。 [Second Embodiment]
Next, a reflective liquid crystal cell 1A according to a second embodiment of the present invention will be described. As shown in FIG. 6, the reflective liquid crystal cell 1 </ b> A includes a first polarizing plate 2, a liquid crystal unit 3, a second polarizing plate 4, and a swell absorbing layer 5 </ b> A. That is, the reflective liquid crystal cell 1A is different from the first embodiment in that the cover glass 6 is not disposed.
　反射型液晶セル１Ａの第一偏光板２、液晶部３及び第二偏光板４は、第一実施形態と同一である。うねり吸収層５Ａは、第二偏光板４の前面４ａのうねりを吸収するともに、前面５ａが平坦な透明な樹脂層である。うねり吸収層５Ａは、第二偏光板４に接着されている。うねり吸収層５Ａの前面５ａは、ローラ手段又はプレス手段等によってうねりが解消されて平坦になっている。前面５ａのうねりは１．０μｍ未満になっている。 The first polarizing plate 2, the liquid crystal unit 3, and the second polarizing plate 4 of the reflective liquid crystal cell 1A are the same as those in the first embodiment. The waviness absorbing layer 5A is a transparent resin layer that absorbs waviness on the front surface 4a of the second polarizing plate 4 and has a flat front surface 5a. The waviness absorbing layer 5 </ b> A is bonded to the second polarizing plate 4. The front surface 5a of the waviness absorbing layer 5A is flattened by waviness being eliminated by roller means or pressing means. The undulation of the front surface 5a is less than 1.0 μm.
　このように形成された第二実施形態に係る反射型液晶セル１Ａによっても第一実施形態と略同等の効果を奏することができる。つまり、第二実施形態のようにカバーガラス６を省略して、うねり吸収層５Ａを露出するようにして形成してもよい。このようにしても、うねり吸収層５Ａの前面５ａのうねりが小さく平坦になっているため、反射型液晶セル１Ａを鏡として用いた場合の反射像の歪みを小さくすることができる。また、第二偏光板４は比較的硬い材料であるため前面４ａを平坦にする作業は困難であるが、うねり吸収層５Ａは比較的軟らかい材料であるため、うねり吸収層５Ａの前面５ａのうねりを小さくして平坦性を容易に高めることができる。なお、具体的な図示は省略するが、第二実施形態に係る反射型液晶セル１Ａに対しても、第一実施形態と同様に対比観察を行ったが、反射像Ｎ２（図５の（ａ）参照）と同じように、歪みの小さい反射像であった。 The reflection-type liquid crystal cell 1A according to the second embodiment formed in this way can provide substantially the same effect as the first embodiment. That is, the cover glass 6 may be omitted as in the second embodiment, and the swell absorbing layer 5A may be exposed. Even in this case, since the undulation of the front surface 5a of the swell absorbing layer 5A is small and flat, the distortion of the reflected image when the reflective liquid crystal cell 1A is used as a mirror can be reduced. Further, since the second polarizing plate 4 is a relatively hard material, it is difficult to flatten the front surface 4a. However, since the swell absorbing layer 5A is a relatively soft material, the undulation of the front surface 5a of the swell absorbing layer 5A. The flatness can be easily increased by reducing the thickness. Although specific illustration is omitted, the reflection type liquid crystal cell 1A according to the second embodiment was also observed in the same manner as in the first embodiment, but the reflected image N2 ((a of FIG. As in (), the reflection image was small in distortion.
　以上本発明の実施形態について説明したが、本発明の趣旨に反しない範囲において適宜設計変更が可能である。例えば、カバーガラス６に代えて、表面反射を抑えるコーティングなどを施してハードコート層を設けても良い。 Although the embodiment of the present invention has been described above, design changes can be made as appropriate without departing from the spirit of the present invention. For example, instead of the cover glass 6, a hard coat layer may be provided by applying a coating for suppressing surface reflection.
　１　　　　反射型液晶セル
　２　　　　第一偏光板（反射型偏光板）
　３　　　　液晶部
　４　　　　第二偏光板（吸収型偏光板）
　５　　　　うねり吸収層
　６　　　　カバーガラス 1 reflective liquid crystal cell 2 first polarizing plate (reflective polarizing plate)
3 Liquid crystal part 4 Second polarizing plate (absorptive polarizing plate)
5 Swell absorption layer 6 Cover glass

Claims (5)

  1. 　直交する偏光成分のいずれか一方を透過させるとともに他方を反射させる第一偏光板と、
    　前記第一偏光板の前面側に配置された液晶部と、
    　前記液晶部の前面側に配置され、入射した入射光の所定の偏光成分を前記液晶部に透過させるとともに、前記液晶部からの入射光を透過させる第二偏光板と、
    　前記第二偏光板の前面に配置され、樹脂製の透明なうねり吸収層と、
    　前記うねり吸収層の前面に配置されたカバーガラスと、を有し、
    　前記うねり吸収層は、前記第二偏光板と前記カバーガラスとを接着するとともに、前記第二偏光板の前面のうねりを吸収することを特徴とする反射型液晶セル。     A first polarizing plate that transmits one of the orthogonal polarization components and reflects the other;
    A liquid crystal part disposed on the front side of the first polarizing plate;
    A second polarizing plate that is disposed on the front side of the liquid crystal unit and transmits a predetermined polarization component of incident light incident on the liquid crystal unit and transmits incident light from the liquid crystal unit;
    A transparent waviness absorbing layer made of resin, disposed on the front surface of the second polarizing plate;
    A cover glass disposed on the front surface of the swell absorbing layer,
    The swell absorbing layer adheres the second polarizing plate and the cover glass and absorbs the swell of the front surface of the second polarizing plate.
  2. 　直交する偏光成分のいずれか一方を透過させるとともに他方を反射させる第一偏光板と、
    　前記第一偏光板の前面側に配置された液晶部と、
    　前記液晶部の前面側に配置され、入射した入射光の所定の偏光成分を前記液晶部に透過させるとともに、前記液晶部からの入射光を透過させる第二偏光板と、
    　前記第二偏光板の前面に配置され、樹脂製の透明なうねり吸収層と、を有し、
    　前記うねり吸収層は、前面が平坦に形成されるとともに、前記第二偏光板の前面のうねりを吸収することを特徴とする反射型液晶セル。     A first polarizing plate that transmits one of the orthogonal polarization components and reflects the other;
    A liquid crystal part disposed on the front side of the first polarizing plate;
    A second polarizing plate that is disposed on the front side of the liquid crystal unit and transmits a predetermined polarization component of incident light incident on the liquid crystal unit and transmits incident light from the liquid crystal unit;
    Disposed on the front surface of the second polarizing plate, and has a transparent waviness absorbing layer made of resin,
    The swell absorbing layer is formed in a flat front surface and absorbs undulations on the front surface of the second polarizing plate.
  3. 　前記第二偏光板のうねりは、前記第一偏光板のうねりよりも大きいことを特徴とする請求項１又は請求項２に記載の反射型液晶セル。 The reflection type liquid crystal cell according to claim 1 or 2, wherein the waviness of the second polarizing plate is larger than the waviness of the first polarizing plate.
  4. 　前記カバーガラスの周縁部は枠状に加飾されていることを特徴とする請求項１に記載の反射型液晶セル。 The reflection type liquid crystal cell according to claim 1, wherein a peripheral edge of the cover glass is decorated in a frame shape.
  5. 　前記うねり吸収層は、１～１００μｍの厚みに形成されていることを特徴とする請求項１又は請求項２に記載の反射型液晶セル。 3. The reflective liquid crystal cell according to claim 1, wherein the swell absorbing layer is formed to a thickness of 1 to 100 μm.
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