WO2003012619A1

WO2003012619A1 - Liquid crystal display device

Info

Publication number: WO2003012619A1
Application number: PCT/JP2002/007661
Authority: WO
Inventors: Takayuki Takagi; Kazuhiro Nishikawa; Takao Hashimoto
Original assignee: Nissha Printing Co., Ltd.
Priority date: 2001-07-31
Filing date: 2002-07-29
Publication date: 2003-02-13
Also published as: TWI226029B

Abstract

A liquid crystal display device in which a touch panel device is constituted to have a transparent and flexible self-curing resin layer (18) disposed on a lower side of a transparent touch panel (11). The self-curing resin layer is disposed so as to be brought into contact with prisms (21a) on an upper surface of a light guide plate (21). When a prism is brought into contact with the self-curing resin layer during input to the touch panel, a contact portion of the self-curing resin layer is damaged while preventing the prism from being damaged and automatically restores the damaged part with the elapse of time.

Description

Specification

Technical field

The present invention relates to a liquid crystal display device in which a reflective liquid crystal display device, a front light device, and a transparent touch panel device are sequentially stacked. The liquid crystal display device of the present invention is particularly suitable for electronic devices such as cordless telephones, mobile phones, calculators, personal computers, PDAs (personal 'digital' assistants), digital cameras, video cameras, and commercial communication devices. Background art

Conventionally, in a portable electronic device provided with a liquid crystal display device, a reflection type liquid crystal display is sometimes used to reduce power consumption. Reflective liquid crystal displays are suitable for portable electronic devices because they have low power consumption by not using a backlight and also have excellent visibility under external light when used outdoors.

In order to use a reflective liquid crystal display indoors or at night where sufficient external light cannot be obtained, it is necessary to illuminate the liquid crystal display from the front side. A front light device, which is a lighting device located, is located.

As a front light device, a light guide plate is arranged in parallel on the display surface of a reflective liquid crystal display, and light from a light source such as a cold cathode tube or LED is taken in from the end surface of the light guide plate, and the display surface of the liquid crystal display is displayed. Irradiation is generally performed. One surface of the light guide plate has a light diffusing function for emitting light incident from the end surface to the display surface of the liquid crystal display. As the light diffusion function, there is a function of forming a large number of fine prisms and microphone aperture lenses on the upper surface of the light guide plate, or performing a fine matting process to diffuse the light. Touch panel devices are frequently used as input devices in portable electronic devices. The touch panel device is arranged above the front light device.

As the touch panel of the touch panel device, a transparent film having a transparent conductive film formed on a lower surface is used as an upper electrode plate, and a transparent resin plate having a transparent conductive film formed on an upper surface is used as a lower electrode plate. Some are configured to be stacked so as to face each other. In addition, as the lower electrode plate, a transparent film having a transparent conductive film formed on the upper surface and a transparent resin plate serving as a support, which is entirely bonded, are used. As the lower electrode plate, the same as the upper electrode plate is used. Some are also composed.

However, when the above touch panel device is used by placing it on a front light device of a liquid crystal display panel in an electronic device, as shown in FIG. 11, input by an input pen 51 or an input of a finger or the like is performed. When an abnormally large load is applied to the surface of the touch panel due to the load at the time, the lower electrode plate is greatly bent. Therefore, as shown in FIGS. 11 and 12, the back surface of the lower electrode plate 117 contacts the upper surface of the front light device, and the fine projections existing on the upper surface of the light guide plate 121 of the front light device. (The end of the prism) may be damaged due to denting. If the fine projections on the upper surface of the light guide plate 121 are damaged, the damaged part emits bright light when the front light device is turned on, and the visibility of the liquid crystal display is significantly reduced. Here, the term “scratch” includes microscopic scratches that cannot be seen visually, which are referred to as electronic components. In FIG. 11, reference numeral 112 denotes an upper electrode film, 113 denotes an upper electrode of a transparent conductive film, 114 denotes a dot spacer, and 116 denotes a lower electrode of a transparent conductive film. 2 is a light source.

Therefore, an object of the present invention is to solve the above-mentioned problems and to provide a liquid crystal display that does not damage the upper surface of the light guide plate of the front light device even when the touch panel device is arranged on the front light device and an input operation is performed. Provide equipment. Disclosure of the invention

The present invention is configured as described below to achieve the above object. According to the first aspect of the present invention, a reflection type liquid crystal display, a front light device including a transparent light guide plate and a light source disposed on a light incident surface which is an end surface thereof, and a touch panel device are sequentially laminated. Liquid crystal display device,

The touch panel device is configured so that a transparent and flexible self-healing resin layer is arranged on the lower surface of the transparent touch panel, and the self-healing resin layer is arranged so as to be able to contact the prism on the upper surface of the light guide plate. Being

The flexibility of the self-healing resin layer is such that when the prism contacts the self-healing resin layer at the time of input to the touch panel, the contact portion prevents the prism from being damaged due to the occurrence of flaws. Further, the present invention provides a liquid crystal display device which is flexible so that the above-mentioned scratched portion is automatically restored with time.

According to a second aspect of the present invention, there is provided the liquid crystal display device according to the first aspect, wherein the self-healing resin layer has a thickness of 10 to 50 μπι.

According to a third aspect of the present invention, in the transparent touch panel, an upper electrode composed of a transparent conductive film is provided on a surface of an upper electrode plate composed of a transparent film, and a lower electrode composed of a transparent resin plate A first electrode or a lower electrode in which a lower electrode composed of a transparent conductive film and a dot-shaped spacer are provided on the surface of the plate, and both electrodes are stacked so as to face each other with a gap provided by the spacer. A liquid crystal display device according to the second aspect is provided.

According to a fourth aspect of the present invention, in the transparent touch panel, an upper electrode made of a transparent conductive film is provided on a surface of an upper electrode plate made of a transparent film, and a lower electrode plate made of a transparent film A lower electrode composed of a transparent conductive film and a dot-shaped spacer are provided on the surface of the first and second electrodes, and both electrodes are stacked so as to face each other with a gap provided by the spacer. The liquid crystal display device according to the second aspect is provided.

According to a fifth aspect of the present invention, in the transparent touch panel, an upper electrode made of a transparent conductive film is provided on a surface of an upper electrode plate made of a transparent film, and a lower electrode plate made of a transparent film is provided. Composed of a transparent conductive film on the surface of A lower electrode plate, a backing made of a transparent resin plate is provided, and both electrodes are opposed to each other with a gap provided by the spacer. The liquid crystal display device according to the first or second aspect, which is laminated.

According to the sixth aspect of the present invention, when the dynamic viscoelasticity of the self-healing resin layer is measured by thermomechanical analysis, the first or second resin having an amplitude width of not less than 25 μπι at 25 ° C. The touch panel device according to the aspect is provided.

According to the seventh aspect of the present invention, the liquid crystal according to the first or second aspect, wherein an air layer exists between the prism on the upper surface of the light guide plate and the self-healing resin layer of the touch panel device. A display device is provided.

According to the eighth aspect of the present invention, a transparent and flexible impact dispersion absorbing layer is disposed between the lower surface of the transparent touch panel and the self-healing resin layer,

The flexibility of the impact dispersion absorbing layer is such that the self-healing resin layer is arranged so as to be able to contact the prism of the light guide plate and the prism comes into contact with the self-healing resin layer at the time of input to the touch panel. The liquid crystal display device according to the first or second aspect, which is flexible such that a portion corresponding to the contacted portion is depressed to absorb an impact from the prism. BRIEF DESCRIPTION OF THE FIGURES

These and other objects and features of the present invention will become apparent from the following description in connection with the preferred embodiments of the accompanying drawings. In this drawing,

FIG. 1 is a cross-sectional view illustrating a liquid crystal display device according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view illustrating a liquid crystal display device according to a second embodiment of the present invention, and FIG. FIG. 4 is a cross-sectional view illustrating a liquid crystal display device according to a third embodiment of the present invention. FIG. 4 shows a portable electronic device incorporating any of the liquid crystal display devices according to the first to third embodiments of the present invention. It is a perspective view,

FIG. 5 is a perspective view showing a portable electronic device incorporating any of the liquid crystal display devices according to the first to third embodiments of the present invention. FIG. 6 is a cross-sectional view illustrating a state in which a self-healing resin layer is actively damaged and damaged at the time of contact with a self-healing resin layer in the first to third embodiments of the present invention,

FIG. 7 is an enlarged sectional view of a portion surrounded by a circle in FIG.

FIG. 8 is a cross-sectional view illustrating a state restored from the state of FIG.

FIG. 9 is a cross-sectional view of the liquid crystal display device incorporating the touch panel device and the liquid crystal display panel in the above embodiment,

FIG. 10 is an explanatory diagram illustrating a state in which an air layer is disposed between the prism on the upper surface of the light guide plate and the self-healing resin layer of the transparent touch panel in the embodiment.

FIG. 11 is a cross-sectional view illustrating a state in which the prism is damaged by pressure at the time of input when inputting with a conventional touch panel device.

FIG. 12 is an enlarged sectional view of a portion surrounded by a circle in FIG.

FIG. 13 is a cross-sectional view showing a state where an impact dispersion absorbing layer is disposed between the lower surface of the transparent touch panel and the self-healing resin layer in a modified example of the above embodiment. BEST MODE FOR CARRYING OUT THE INVENTION

Before continuing the description of the present invention, the same reference numerals are given to the same components in the accompanying drawings.

Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

1 to 3 are cross-sectional views showing a liquid crystal display device according to first to third embodiments of the present invention, respectively. FIG. 4 is a perspective view showing a portable electronic device incorporating any of the liquid crystal display devices according to the first to third embodiments of the present invention. FIG. 5 is a perspective view showing a portable electronic device incorporating any of the liquid crystal display devices according to the first to third embodiments of the present invention. In the figure, 1 is a liquid crystal display device, 10 (10A, 1 OB, I OC) is a touch panel device, 11 (11A, 11B, 11C) is a transparent touch panel, 12 is a transparent upper electrode plate, and 13 is a transparent upper electrode plate. Transparent upper electrode, 14 is spacer, 15 is a peripheral adhesive layer, 16 is a transparent lower electrode, 17 is a transparent lower electrode, 18 is a transparent self-healing resin layer, 20 is a front light device, 21 is a transparent light guide plate. Reference numeral 22 denotes a light source, reference numeral 30 denotes a liquid crystal display device, reference numeral 41 denotes a transparent support, and reference numerals 5OA and 50B denote portable electronic devices.

In the touch panel device 1 OA according to the first embodiment of FIG. 1, the transparent touch panel 11 A has an upper electrode 13 made of a transparent conductive film on the surface of an upper electrode plate 12 made of a transparent film. A lower electrode 16 made of a transparent conductive film and a dot-shaped spacer 14 are provided on the surface of a lower electrode plate 17 made of a transparent resin plate. 6 are adhered and laminated by a peripheral adhesive layer 15 so as to face each other with a gap provided by a spacer 14. On the back surface of the lower electrode plate 17 of the transparent touch panel 11A, a self-healing resin layer 18 is disposed, and the self-healing resin layer 18 has the irregularities of the light guide plate 21 of the front light device 20. The liquid crystal display 30 is arranged so as to be able to contact the upper surface and to be arranged on the lower surface of the light guide plate 21 of the front light device 20. Therefore, in the first embodiment, the touch panel device 10A is composed of the transparent touch panel 11A and the self-healing resin layer 18 disposed at the lowermost layer of the transparent touch panel 11A. The device 1 OA is assembled to a liquid crystal display panel having a front light device 20 and a liquid crystal display 30 to form a liquid crystal display device. The touch panel device 1 OB according to the second embodiment shown in FIG. 2 includes a transparent touch panel 11 B, an upper electrode 13 made of a transparent conductive film provided on a surface of an upper electrode plate 12 made of a transparent film. A lower electrode 16 made of a transparent conductive film and a dot spacer 14 are provided on the surface of a lower electrode plate 17F made of a transparent film, and both electrodes 13 and 16 are provided. The spacers 14 are adhered and laminated by a peripheral adhesive layer 15 so as to face each other with a gap. A self-healing resin layer 18 is disposed on the back surface of the lower electrode plate 17 of the transparent touch panel 11 B, and the self-healing resin layer 18 is formed on the light guide plate 21 of the front light device 20. The liquid crystal display 30 is arranged so as to be capable of contacting a certain upper surface and to be disposed on the lower surface of the light guide plate 21 of the front light device 20. Therefore, this first In the embodiment, the touch panel device 10 B is configured by the transparent touch panel 11 B and the self-healing resin layer 18 disposed at the lowermost layer of the transparent touch panel 11 B. The liquid crystal display device is constructed by assembling it with a liquid crystal display panel having a front light device 20 and a liquid crystal display 30. In addition, the transparent touch panel 11 C of the touch panel device 10 C according to the third embodiment of FIG. 3 has a lower side of the lower electrode plate 17 of the transparent touch panel 11 A of the first embodiment than the transparent resin plate. The support body 41 is configured by laminating. Therefore, in the third embodiment, the touch panel device 10 C is configured by the transparent touch panel 11 C, the support body 41 disposed on the lower surface of the transparent touch panel 11 C, and the self-healing resin layer 18. Then, the touch panel device 10C is assembled to a liquid crystal display panel having a front light device 20 and a liquid crystal display 30 to constitute a liquid crystal display device.

As described above, the liquid crystal display device 1 according to the first to third embodiments of the present invention is arranged on the reflection type liquid crystal display device 30, the transparent light guide plate 21 and the light incident surface which is the end surface thereof. In a liquid crystal display device in which a front light device 20 composed of a light source 22 and a touch panel device 10 are sequentially laminated, a transparent and flexible self-healing resin layer 1 is provided on the lower surface of the transparent touch panel 11. By configuring the touch panel device 10 so that the touch panel 8 is disposed, the touch panel device 10 and the front light device 20 that come into contact with each other when inputting to the touch panel device 10 are protected. (See Figures 1 to 3).

The touch panel device 10 has a transparent and flexible self-healing resin layer 18 formed on the lower surface of the transparent touch panel 11.

As the transparent touch panel 11, what is called a resistive film type may be used. The transparent touch panel of the resistive film type is composed of an upper electrode plate 12 provided with an upper electrode 13 made of a transparent conductive film and a lower electrode plate 17 provided with a lower electrode 16 made of a transparent conductive film. The electrodes 13 and 16 are arranged with a slight gap between them so that they face each other, and a part of the surface of the touch panel is pressed to bend the upper electrode plate 12 so that the electrodes 1 and 16 are bent. Contact 3 and 16 to make them electrically conductive It refers to a method of inputting coordinates.

As the transparent touch panel 11A, 11B, 11C of the resistive film type, an upper electrode 13 made of a transparent conductive film is provided on the surface of an upper electrode plate 12 made of a transparent film. A lower electrode 16 composed of a transparent conductive film and a number of dot-shaped spacers 14 are provided on the surface of a lower electrode plate 17 (17F) composed of a transparent resin plate. It is preferable to use a structure in which the layers 3 and 16 are stacked so as to face each other with a gap provided by the spacer 14 (see FIGS. 1 to 3). Such a configuration is suitable for reducing the weight of the transparent touch panels 11A, 11B, and 11C.

As the transparent film, a polycarbonate resin film, a polyamide resin film, a polyetherketone resin film, an acrylic resin film, a polyethylene terephthalate resin film, a polybutylene terephthalate resin film, or the like can be used.

As the transparent conductive film, an indium tin oxide (ITO) film, an oxide oxide film, or the like can be used.

As the transparent resin plate, a plate material composed of a resin having excellent transparency such as an acrylic resin, a polycarbonate resin, a polystyrene resin, and a polyolefin resin can be used.

The spacer 1 _4, can be a transparent resin such as a photosensitive Akuriru Ya photosensitive polyester obtained by forming into fine dot shape by the photo process. Further, the spacer 14 can also be formed by forming a large number of transparent inks composed of an acrylic resin, an epoxy resin, a polyester resin, or the like in a fine dot shape by a printing method.

The peripheral adhesive layer 15 is formed by bonding the upper electrode plate 12 and the upper electrode 13 to the lower electrode plate 17 (17F) and the lower electrode 16 at the peripheral edge. The peripheral adhesive layer 15 is formed by applying an acrylic adhesive to one or both of the lower peripheral edge of the upper electrode 扳 12 and the upper peripheral edge of the lower electrode plate 17 (17F). Can be formed. Further, a double-sided adhesive tape may be used. Further, as in the second embodiment, a transparent film may be used as the lower electrode plate 17F (see FIG. 2). In this case, the thickness can be further reduced. Further, glass may be used as the lower electrode plate 17 (17F). When glass is used for the lower electrode 扳 17, if the self-healing II ”green resin layer 18 is not used, the glass surface is exposed, and cracks may occur if a drop impact is applied. In addition, there is a case where the glass bends and breaks even when static pressure is applied under a strong load, However, in the second embodiment having the self-healing resin layer 18, the self-healing resin layer 18 It has the effect of alleviating the impact of falling and the deflection under static pressure, and can reduce the number of cracks.

Further, in order to make the transparent touch panel 11B itself rigid, the lower electrode plate 1

A support 41 made of a transparent resin plate may be laminated and used below 7F (see FIG. 3). At this time, the self-healing resin layer 18 is disposed below the support 41.

As the support 41, a plate material made of a resin having excellent transparency such as an acrylic resin, a polycarbonate resin, a polystyrene resin, or a polyolefin resin can be used.

The transparent touch panels 11A, 11B, and 11C having the above-described configuration are suitable for reducing the weight of the transparent touch panels 11A, 11B, and 11C. Further, as the transparent touch panels 11A, 11B and 11C, different types such as a capacitance type and an optical type may be used.

On the lower surface of the transparent touch panel 11A, 11B, 11C, a transparent and flexible self-healing resin layer 18 is formed. The touch panel devices 10A, 10B, and 10C are deflected due to the load at the time of input with an input pen, finger, etc. When the prism 21a on the upper surface of the light guide plate 21 having the fine unevenness of the located front light device 20 comes into contact with the light guide plate 21, the self-healing resin layer 18 is brought into contact with the light guide plate 21 as shown in FIGS. When the tip of the prism 21a on the top surface of the is in contact with the scratches or dents, it is actively scratched during the contact, causing damage. The prism 21a functions to protect the fine uneven shape of the 21a. The portion of the self-healing resin layer 18 where the tip of the prism 21 a is scratched or dented due to contact with the tip of the prism 21 a is, as shown in FIG. With the self-healing function, it is restored over time.

The self-healing resin layer 18 needs to have high transparency so as not to lower the visibility of the touch panel device 10A, 1OB, and IOC. Specifically, the total light transmittance is preferably at least 85 ° / ₀ and the haze is preferably within 5%. Also, as the thickness of the self-healing 1 "green resin layer 18 increases, the distance between the surface of the touch panel devices 1OA, 10B, and the IOC and the liquid crystal display device 30 increases, and the parallax increases and the visibility increases. Is unsuitable because it decreases.

Due to the impact, the self-healing resin layer 18 is actively damaged and damaged, but the self-healing resin layer 18 needs to have flexibility in order to automatically recover over time. If there is too much flexibility, the shape of the self-healing resin layer 18 itself is deformed, and a trace that can be visually recognized remains on the self-healing resin layer 18 itself, which is inconvenient. Therefore, a certain degree of hardness (pencil hardness (JIS-K540)

1900) The self-healing resin layer 18 was damaged by the impact while maintaining the hardness of the HB to the extent that it was damaged by HB). A material that is flexible and has the above flexibility with a small thickness is used. The term “scratch” as used herein includes not only a scratch that is usually noticeable at a visual level, but also a fine scratch that cannot be seen, which is referred to as an electronic component.

The self-healing 4 resin refers to a resin having a function of being repaired with the lapse of time due to its elasticity even if some dents or scratches are generated. Examples of the resin having such a function include resins having an acryl-based or urethane-based crosslinked structure. When a self-healing resin is used as the self-healing resin layer 18, its thickness is suitably from 10 to 50 / m.

This self-healing resin has a structure such as a cross-link or a network structure, and even if deformed, restores its shape before deformation with the passage of time. When inputting to the touch panel, pressure is applied to the surface of the touch panel with a finger or pen, and the touch panel slides. At this time, the self-healing resin of the self-healing resin layer 18 of the touch panel is deformed, thereby reducing damage to the prism 21 a of the front light device 20. Then, as time passes, the self-healing resin is restored to the shape before deformation. Therefore, even if the surface of the touch panel is repeatedly slid, the deterioration of the prism 21 a of the front light device 20 is not recognized, and the image quality of the liquid crystal display 30 is not deteriorated. It should be noted that in the present specification, in order to explain the function of restoring over time in a simple manner in a simple manner, the expression similar to “self-healing” of a living body is used.

To form the self-healing resin into the self-healing resin layer 18, the self-healing resin layer 18 is applied to the lower surface of the transparent touch panel 11 A, 11 B, 11 C and cured. Can be formed.

In addition, the self-healing resin layer 18 may be formed by attaching a self-healing resin coating film to the lower surface of the transparent touch panel 11A, 11B, 11C. In other words, a self-healing resin film is coated on a transparent film such as PET (polyethylene terephthalate) or PC (polycarbonate) in advance using a roll coater, etc. A transparent touch panel 11A, 11B, 11C may be bonded to the entire lower surface via a transparent adhesive.

The liquid crystal display device 1 having such a configuration includes a reflection type liquid crystal display device 30 and a front light device such as a cordless telephone, a mobile phone, a calculator, a sub-notebook personal computer, a PDA, a digital camera, a video camera, and a business communication device. It can be applied to portable electronic devices 5 OA and 5 OB provided with 20.

One example of a portable electronic device 50 incorporating the night crystal display device 1 of the present invention is shown in FIGS. The portable electronic device 50 realizes an input function by a touch panel device 10 which is a pen input device installed at the top of the liquid crystal display unit. Tatsuchipanenore device

10 is a combination of at least a reflective liquid crystal display device 30 and a front light device 20 (see FIGS. 1 to 3).

The front light device 20 is usually arranged on the transparent light guide plate 21 and its end face. And a light source 22.

The light guide plate 21 is preferably made of a transparent resin. Examples of the transparent resin include acrylonitrile-styrene copolymer resin, cellulose acetobutylate resin, cellulose propionate resin, polymethylpentene resin, polycarbonate resin, polystyrene resin, and polyester resin, which have excellent transparency and light-guiding properties. Resin or the like can be used.

As the shape of the light guide plate 21, a plate-like light guide plate 21 having a large number of fine projections formed on the upper surface is used. Examples of the fine projection shape include a prism shape, a micro lens shape, and a mat shape.

The air layer 40 is arranged between the prism 21 a on the upper surface of the light guide plate 21 and the self-healing resin layer 18 on the lower surface of the transparent touch panel 11. That is, an air layer 4 is provided between the prism 21 on the upper surface of the light guide plate 21 and the self-healing resin layer 18 on the lower surface of the transparent touch panel 11 to provide a refractive index of light. 0 is required. This is because, as shown in FIGS. 9 and 10, the difference between the refractive index (about 1.5) of the prism 2 la and the refractive index (1) of the air layer 40 (about 0.5) gives the light source 2

The light from 2 is reflected by the prism surface 21a, the light falls directly below, and only the light reflected by the reflector 49 under the liquid crystal display 30 is emitted from the light guide plate 21. This is because angles and the like are designed. Therefore, when the air layer 40 is not provided between the prism 2 la and the self-healing resin layer 18 of the transparent touch panel 11 (there is no difference in refractive index), light is not emitted well. The thickness of the air layer 40 is not particularly limited, but is preferably 10 to 100 / im in order to reduce the total set thickness and the parallax of the liquid crystal display 30. In FIG. 9, reference numeral 50 denotes a frame, which is a frame 50 in which the liquid crystal display 30 and the light guide plate 21 are incorporated.

(Example)

An upper electrode plate composed of a 150 / xm thick transparent film with an upper electrode composed of ITO formed on the lower surface, and a lower electrode composed of a lower electrode composed of ITO and transparent resin formed on the upper surface Form spacers (area occupancy 0.1%, height 3 / im) With a lower electrode plate composed of a transparent film with a thickness of 100 μππ, and using a double-sided adhesive tape as a peripheral adhesive layer so that both electrodes face each other with a space between them with a spacer. Was.

Next, a polycarbonate plate having a thickness of 1.0 mm was adhered to the entire lower surface of the lower electrode plate via a transparent adhesive material to laminate a support, thereby obtaining a transparent touch panel of a resistive film type.

Next, a self-healing resin composed of an acrylic resin having a cross-linked structure is applied to the lower surface of the transparent touch panel by a coating method so as to have a thickness of 30 m to form a self-healing resin layer. I got

The touch panel device thus obtained was laminated on the upper surface of the front light device.

As the light guide plate of the front light device, a light guide plate in which a number of prism lines having a non-equilateral triangular cross section were formed on the upper surface of an acrylic resin plate was used. The apex angle of the triangle was 50 °, and the pitch between the prism lines was 200 μπι.

Next, a 5 O mm folding slide was performed linearly in a direction perpendicular to the prism line of the front light device by 100,000 strokes with a writing pressure (load pressure) of 2.45 mm toward the center of the input surface of the touch panel surface. And a sliding test was performed to check the front light device and touch panel device while the light source of the front light device was turned on.No external damage was found on either the front light device or the touch panel device. Was.

(Comparative example)

A transparent polyethylene terephthalate film having a thickness of 50 μππ was adhered to the lower surface of the same transparent touch panel as in Example 1 with a transparent adhesive having a thickness of 25 μππ completely interposed therebetween to form a transparent film layer. Then, a touch panel device was obtained.

The touch panel device thus obtained was laminated on the upper surface of the front light device as in Example 1, and the same sliding test as in Example 1 was performed. Scratched.

Note that the present invention is not limited to the above embodiment, and various other aspects Can be implemented.

For example, as shown in FIG. 13, a transparent and flexible impact dispersion absorbing layer 318 may be disposed between the lower surface of the transparent touch panel 11 and the self-healing resin layer 18.

The flexibility of the impact dispersion / absorption layer 318 is such that the self-healing resin layer 18 is disposed so as to be able to contact the prism 21 a of the light guide plate 21, and the prism 21 a is self-healing at the time of input to the touch panel. When it comes into contact with the resin layer 18, the portion of the impact dispersion absorbing layer 318 corresponding to the contacted portion is dented, so that the impact is absorbed by the prism. Therefore, the touch panel device 1 OA, 1 OB, I OC force S radius, the self-healing resin layer 18 on the lower surface of the touch panel device 10 A, 1 OB, 10 C by the load at the time of input with the input pen 51 or a finger, When the force S comes into contact with the prism 21a on the upper surface of the light guide plate 21 having the fine irregularities of the front light device 20 located below the touch panel devices 10A, 10B, and 10C, the upper surface of the light guide plate 21 The concave portion of the impact dispersion absorbing layer 318 corresponding to the portion of the self-healing resin layer 18 contacted by the tip of the prism 21 a absorbs the pressure at the time of the contact, and causes fine irregularities on the upper surface of the light guide plate 21. It functions to more reliably protect the shape. The concave portion of the impact dispersion absorbing layer 318 is restored over time by the flexibility function of the impact dispersion absorbing layer 318 itself.

The impact dispersion absorbing layer 318 needs to have high transparency in order not to lower the visibility of the touch panel devices 10A, 10B, and 10C. Specifically, it is preferable that the total light transmittance is 85% or more and the haze is 5% or less. The reasons are as follows. In particular, since the liquid crystal display 30 of each of the above embodiments is of a reflective type, the brightness of the liquid crystal display 30 depends on the light that has passed through the touch panel 10 twice when the front light is not lit. Therefore, the transmittance of the touch panel 10 is regarded as important, and there is a general requirement of 85% or more. When the haze is high, light diffusion occurs and clear images cannot be obtained.

Also, when the thickness of the impact dispersion absorbing layer 318 increases, the touch panel device 10 The distance between the surface of A, 1 OB, 1 OC and the liquid crystal display 30 is increased, and the parallax is increased, and the visibility is reduced.

In order to absorb the impact, the impact dispersion / absorption layer 318 must have flexibility, but if it is too flexible, the shape of the impact dispersion / absorption layer 318 itself will be deformed, so that it can be seen. This is inconvenient because traces of 残る remain on the impact dispersion absorbing layer 318 itself. Therefore, it is necessary to use a material that has a certain degree of hardness and is flexible enough to absorb the impact and absorbs the impact with a small thickness as the impact dispersion absorbing layer 318. Materials having such characteristics include silicone resin and polymer gel.

As the silicone resin, a gel sheet having an adhesive surface is suitable. When a silicone resin is used as the impact dispersion absorbing layer 318, its thickness is suitably 50 to 500 / im. The rubber hardness of the silicone resin is suitably from 10 to 50 (Japanese Industrial Standards (JIS) JIS-K 6 25 31 997). Further, 10 to 30 is more desirable.

Acrylic resin, urethane resin, natural polymer material, etc. can be used as the polymer gel. When a polymer gel is used as the impact dispersion absorbing layer 318, its thickness is suitably 50 to 500 μηη.

When the silicone resin is used as the impact dispersion / absorption layer 318, the impact dispersion / absorption layer 318 is formed by applying and curing the lower surface of the transparent touch panel 11A, 11B, 11C. be able to. In addition, the polymer gel is applied to the impact dispersion and absorption layer 3 1

In the case of 8, the impact dispersion absorbing layer 318 is formed by attaching a polymer sheet shaped into a gel sheet to the lower surface of the transparent touch panel 11 1, 11 1, 11C. be able to.

Regarding the hardness / temperature characteristics of the impact dispersion / absorption layer 318, when the dynamic viscoelasticity is measured by thermomechanical analysis (ΤΜΑ method), the amplitude width at 25 ° C needs to be 25 μππ or more. Also, it is desirable that the amplitude value has little change in the range from low temperature (120 ° C) to high temperature (70 ° C). That is, it is desirable that the hardness does not change over a wide temperature range, and examples thereof include silicone rubber and acrylic gel. In some cases, different The desired characteristics may be obtained by laminating different materials. Here, the TMA method is defined in Japanese Industrial Standards (JIS) JIS-K 711 196 1991, and this standard applies to thermo-mechanical processing of thermoplastic plastic films and sheets. It is a rule on the soft tan temperature test method based on the penetration mode of analysis (TMA). The needle insertion mode is a method of measuring the displacement of a test piece due to softening using the needle-shaped indenter of the TMA device.

An adhesive can be used as the impact dispersion / absorption layer 318. However, the impact dispersion / absorption layer 318 may be made of a material other than the adhesive (a material having no tackiness such as silicone rubber or urethane). Can be used.

The present invention has the following configuration, and thus has the following effects.

The liquid crystal display device of the present invention includes a reflection type liquid crystal display device, a front light device including a transparent light guide plate and a light source disposed on a light incident surface which is an end surface thereof, and a touch panel device. In a liquid crystal display device, by configuring the touch panel device so that a transparent and flexible self-healing resin layer is formed on the lower surface of the transparent touch panel, the touch panel device and the front panel that come into contact when inputting to the touch panel device are formed. Since it is configured to protect each surface of the light device, even if the touch panel device is placed on the front light device and the input operation is performed, the upper surface of the light guide plate of the front light device will be damaged (that is, in terms of electronic components). Irrespective of the size of the surface, which can cause invisible fine scratches). In other words, the portion of the self-healing resin layer where the tip of the prism on the upper surface of the light guide plate is in contact is scratched or dented, so that the self-healing property is obtained when the prism comes into contact with the self-healing resin layer. The resin layer is actively damaged and damaged, and protects the fine irregularities of the prism (that is, prevents the occurrence of invisible fine scratches, which are said to be electronic components, on the fine irregularities of the prism). Functions can be performed.

It should be noted that by appropriately combining any of the various embodiments described above, the effects of the respective embodiments can be achieved.

The present invention is fully described in connection with the preferred embodiments with reference to the accompanying drawings, in which: However, various changes and modifications will be apparent to those skilled in the art. It is to be understood that such changes and modifications are intended to be included therein without departing from the scope of the invention as set forth in the appended claims.

Claims

The scope of the claims

1. A front light device (20) consisting of a reflective liquid crystal display (30), a transparent light guide plate (2 1) and a light source (22) arranged on the light incident surface that is the end face thereof, In a liquid crystal display device in which touch panel devices (10) are sequentially laminated,

The touch panel device is configured so that a transparent and flexible self-healing lunar layer (18) is arranged on the lower surface of the transparent touch panel (11), and the self-healing resin layer (1 8) is disposed so as to be able to contact the prism (21a) on the upper surface of the light guide plate (21),

The flexibility of the self-healing resin layer (18) is such that when the prism (21a) comes into contact with the self-healing resin layer at the time of input to the touch panel, a scratch is generated at the contacted part. A flexible liquid crystal display device that prevents damage to the prism (21a), and that automatically restores the scratched portion with the passage of time.

2. The liquid crystal display device according to claim 1, wherein the self-healing resin layer has a thickness of 10 to 50 µm.

3. The above-mentioned transparent touch panel has an upper electrode (1 2) composed of a transparent film and an upper electrode (1 3) composed of a transparent conductive film provided on the surface of an upper electrode plate (1 2) composed of a transparent film. A lower electrode (16) made of a transparent conductive film and a dot-shaped spacer (14) are provided on the surface of the plate (17), and both electrodes face each other with a gap provided by the spacer. 3. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is laminated.

4. The above-mentioned transparent touch panel is an upper electrode plate composed of a transparent film

An upper electrode (13) composed of a transparent conductive film is provided on the surface of (12), and a lower electrode composed of a transparent conductive film on the surface of a lower electrode plate (17) composed of a transparent film. (16) and a dot spacer (14) are provided. 3. The liquid crystal display device according to claim 1, wherein the liquid crystal display devices are stacked so as to face each other with a gap provided by the spacer.

5. The transparent touch panel is characterized in that an upper electrode (1 3) composed of a transparent conductive film is provided on a surface of an upper electrode plate (1 2) composed of a transparent film, and a lower electrode plate composed of a transparent film is provided. A lower electrode (16) composed of a transparent conductive film and a dot-shaped spacer (14) are provided on the surface of (17), and a support composed of a transparent resin plate is provided on the back surface of the lower electrode plate. 3. The liquid crystal display device according to claim 1, wherein a body (41) is provided, and both electrodes are stacked so as to face each other with a gap provided by the spacer.

6. When the dynamic viscoelasticity of the self-healing resin layer is measured by thermomechanical analysis,

3. The touch panel device according to claim 1, wherein the amplitude width at 25 ° C. is 25 μm or more.

7. An air layer (40) is provided between the prism (21a) on the upper surface of the light guide plate (21) and the self-healing resin layer (18) of the touch panel device (10). The liquid crystal display device according to claim 1, wherein the liquid crystal display device exists.

8. A transparent and flexible impact dispersion absorbing layer (3 18) is disposed between the lower surface of the transparent touch panel (1 1) and the self-healing lunar layer (18), and the impact dispersion The flexibility of the absorbing layer is such that the self-healing resin layer (18) is arranged so that it can come into contact with the prism (21a) of the light guide plate (21), and the prism enters the input to the touch panel. When (21a) comes into contact with the self-healing resin layer (18), the part corresponding to the contacted part is dented, so that it is flexible enough to absorb the impact from the prism (21a). Claim 1 or 2