JP2003114418A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device in which the upper surface of a light guide plate of a front light device is not scratched even when input operation is carried out with a touch panel device arranged on the front light device. SOLUTION: The touch panel device is constructed in such a way that a transparent and flexible self-healing resin layer (18) is disposed on the lower surface of a transparent touch panel (11) and, at the same time, the self-healing resin layer is disposed so as to be accessible to prisms (21a) on an upper surface of the light guide plate (21). When the prisms are brought into contact with the self-healing resin layer in input operation on the touch panel, the pliability of the self-healing resin layer prevents the prisms from being damaged by generation of a scratch at a point of contact and, at the same time, the flexibility makes the generated scratch part spontaneously restored to the original state after the lapse of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention 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 phones, mobile phones, calculators, personal computers, PDAs (personal digital assistants), digital cameras, video cameras, and commercial communication devices.

[0002]

2. Description of the Related Art Conventionally, in a portable electronic device equipped with a liquid crystal display device, a reflective liquid crystal display is sometimes used to reduce power consumption. The reflective liquid crystal display is suitable for portable electronic devices in that it consumes less power by not using a backlight and has excellent visibility under external light when used outdoors.

In order to use a reflective liquid crystal display in an environment such as indoors or at night where sufficient outside light cannot be obtained, it is necessary to illuminate the liquid crystal display from the front side, and therefore, the liquid crystal display must be installed above the liquid crystal display. A front light device, which is a lighting device in which a light source is located, is arranged.

As a front light device, a light guide plate is arranged in parallel on the display surface of a reflective liquid crystal display,
It is general that light from a light source such as a cold cathode tube or an LED is taken in from the end surface of the light guide plate and irradiated onto the display surface of a liquid crystal display. One surface of the light guide plate has a light diffusion function for emitting the light entering from the end surface to the display surface of the liquid crystal display. As a light diffusion function, there is a function of diffusing light by forming a large number of fine prisms or microlenses on the upper surface of the light guide plate or by performing a fine matting process.

A touch panel device is often used as an input device in portable electronic equipment. The touch panel device is arranged on the front light device.

In a touch panel of a 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. There is one that is formed by stacking so as to face each other. Also, as the lower electrode plate, a transparent film having a transparent conductive film formed on the upper surface is entirely bonded to a transparent resin plate serving as a support, or as the lower electrode plate, the same as the upper electrode plate is used. There are also things that are configured.

[0007]

However, when the above touch panel device is arranged and used on a front light device of a liquid crystal display panel in an electronic device, the touch panel device shown in FIG.
As shown in FIG. 1, when an abnormally large load is applied to the surface of the touch panel due to the load at the time of inputting with the input pen 51 or a finger, the lower electrode plate is largely bent. Therefore, as shown in FIGS. 11 and 12, the lower electrode plate 11
The back surface of 7 contacts the upper surface of the front light device, and the fine projection shape (the tip of the prism) existing on the upper surface of the light guide plate 121 of the front light device is dented or damaged. If the fine protrusions on the upper surface of the light guide plate 121 are damaged,
When the front light device is turned on, the damaged portion emits bright light, which significantly reduces the visibility of the liquid crystal display. The term "scratch" as used herein includes fine scratches that are invisible to the eye and are referred to in electronic parts. In FIG. 11, 112 is an upper electrode film and 11
3 is an upper electrode of a transparent conductive film, 114 is a dot spacer,
116 is a lower electrode of the transparent conductive film, and 122 is a light source.

Therefore, an object of the present invention is to solve the above problems and to damage the upper surface of the light guide plate of the front light device even if the touch panel device is arranged on the front light device and an input operation is performed. There is no liquid crystal display device.

[0009]

The present invention is configured as follows in order to achieve the above object.

According to the first aspect of the present invention, there are provided a reflective liquid crystal display, a front light device including a transparent light guide plate and a light source arranged on a light entrance surface which is an end face thereof, and a touch panel device. In the sequentially stacked liquid crystal display device, the touch panel device is configured such that the transparent and flexible self-healing resin layer is disposed on the lower surface of the transparent touch panel, and the self-healing resin layer is the light guide plate. When the prism contacts the self-healing resin layer when inputting to the touch panel, the flexibility of the self-healing resin layer is arranged so as to be contactable with the prism on the upper surface of the touch panel. This prevents damage to the prism, and is flexible enough to automatically restore the generated scratches over time. To provide a device.

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 μm.

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

According to a sixth aspect of the present invention, in the first or second aspect, the amplitude width at 25 ° C. is 25 μm or more when the dynamic viscoelasticity of the self-healing resin layer is measured by thermomechanical analysis. The touch panel device described above is provided.

According to the seventh aspect of the present invention, there is an air layer between the prism on the upper surface of the light guide plate and the self-healing resin layer of the touch panel device.
The liquid crystal display device according to the above aspect is provided.

According to an 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, and the impact dispersion absorbing layer is flexible. When the prism is in contact with the prism of the light guide plate and the prism contacts the self-curing resin layer during input to the touch panel, the self-healing resin layer is a portion corresponding to the contacted portion. A liquid crystal display device according to the first or second aspect, which is flexible so as to absorb the impact from the prism by being dented.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described in detail below with reference to the drawings. In the accompanying drawings, the same parts are designated by the same reference numerals.

1 to 3 show the first to third aspects of the present invention, respectively.
It is sectional drawing which shows the liquid crystal display device concerning 3rd Embodiment.
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 and 10 (10
A, 10B, 10C are touch panel devices, 11 (11
A, 11B, 11C) is a transparent touch panel, 12 is a transparent upper electrode plate, 13 is a transparent upper electrode, 14 is a spacer, 15 is a peripheral adhesive layer, 16 is a transparent lower electrode, 17 is a transparent lower electrode plate, 18 is a transparent self-healing resin layer, 2
Reference numeral 0 is a front light device, 21 is a transparent light guide plate, 22 is a light source, 30 is a liquid crystal display device, 41 is a transparent support, and 50A and 50B are portable electronic devices.

In the touch panel device 10A according to the first embodiment of FIG. 1, the transparent touch panel 11A is provided with 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, and both electrodes 13 and 16 face each other with a gap provided by the spacer 14. As described above, the peripheral adhesive layer 15 is adhered and laminated. Lower electrode plate 1 of transparent touch panel 11A
A self-healing resin layer 18 is disposed on the back surface of the front light device 7, and the self-healing resin layer 18 is placed so as to be in contact with the uneven upper surface of the light guide plate 21 of the front light device 20. The liquid crystal display 30 is arranged on the lower surface of the light guide plate 21. Therefore, in the first embodiment, the touch panel device 10A is configured by the transparent touch panel 11A and the self-healing resin layer 18 arranged at the lowermost layer of the transparent touch panel 11A, and the touch panel device 10A is referred to as the front light device 20. A liquid crystal display device is constructed by being assembled to a liquid crystal display panel having a liquid crystal display 30.

In the touch panel device 10B according to the second embodiment of FIG. 2, the transparent touch panel 11B has an upper electrode 13 made of a transparent conductive film provided 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 formed on the surface of a lower electrode plate 17F made of a transparent film.
Are provided, and both electrodes 13 and 16 are adhered and laminated by a peripheral edge adhesive layer 15 so as to face each other with a gap provided by a spacer 14. A self-healing resin layer 18 is arranged on the back surface of the lower electrode plate 17 of the transparent touch panel 11B,
The self-healing resin layer 18 is placed so as to be in contact with the uneven upper surface of the light guide plate 21 of the front light device 20, and the liquid crystal display 30 is arranged on the lower surface of the light guide plate 21 of the front light device 20. is doing. Therefore,
In the first embodiment, a transparent touch panel 11B and a self-healing resin layer 18 arranged at the bottom of the transparent touch panel 11B constitute a touch panel device 10B, and the touch panel device 10B is combined with a front light device 20 and a liquid crystal display. The liquid crystal display device is constructed by assembling the liquid crystal display panel having

Further, the transparent touch panel 11C of the touch panel device 10C according to the third embodiment shown in FIG. 3 is a support made of a transparent resin plate below the lower electrode plate 17 of the transparent touch panel 11A of the first embodiment. It is configured by laminating 41. Therefore, in the third embodiment, the transparent touch panel 11C, the support 41 arranged on the lower surface of the transparent touch panel 11C, and the self-healing resin layer 18 constitute the touch panel device 10C, and the touch panel device 10C is used as a front light. A liquid crystal display device is constructed by assembling the liquid crystal display panel having the device 20 and the liquid crystal display 30.

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 face thereof. In the liquid crystal display device in which the front light device 20 including the light source 22 and the touch panel device 10 are sequentially stacked, the transparent and flexible self-healing resin layer 18 is disposed on the lower surface of the transparent touch panel 11. By configuring the touch panel device 10 as described above, the surfaces of the touch panel device 10 and the front light device 20 that come into contact when inputting to the touch panel device 10 are protected. (See FIGS. 1 to 3).

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

As the transparent touch panel 11, a so-called resistive film type may be used. The resistive film type transparent touch panel is an upper electrode 1 composed of a transparent conductive film.
3 and an upper electrode plate 12 provided with a lower electrode 16 made of a transparent conductive film,
The spacers 14 are arranged with a slight gap so that the electrodes 3 and 16 face each other, and the upper electrode plate 12 is bent by pressing a part of the surface of the touch panel to thereby deflect the electrodes 13 and 1.
6 is a system in which 6 is brought into contact and electrically connected to input coordinates.

Resistive film type transparent touch panels 11A, 1
As 1B and 11C, 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, and a lower electrode plate 1 made of a transparent resin plate is provided.
7 (17F) is provided with a lower electrode 16 composed of a transparent conductive film and a large number of dot-shaped spacers 14 on the surface thereof, and both electrodes 13 and 16 are laminated by the spacers 14 so as to face each other with a gap therebetween. It is preferable to use one (see FIGS. 1 to 3). Such a configuration has a transparent touch panel 11
It is suitable for reducing the weight of A, 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, a tin oxide film or the like can be used.

As the transparent resin plate, it is possible to use 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.

The spacer 14 can be obtained by forming a transparent resin such as photosensitive acrylic or photosensitive polyester into a fine dot shape by a photo process. Also, a large number of transparent inks made of acrylic resin, epoxy resin, polyester resin or the like can be formed in a fine dot shape by a printing method to form the spacer 14.

The peripheral edge adhesive layer 15 adheres 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 edge adhesive layer 15 is formed on one or both of the peripheral edge portion on the lower surface of the upper electrode plate 12 and the peripheral edge portion on the upper surface of the lower electrode plate 17 (17F).
It can be formed by applying an acrylic adhesive or the like. Moreover, you may use a double-sided adhesive tape.

Further, as in the second embodiment, a transparent film may be used as the lower electrode plate 17F (see FIG. 2). In this case, it is possible to make the device thinner. Further, glass may be used as the lower electrode plate 17 (17F). When glass is used for the lower electrode plate 17, if the self-healing resin layer 18 is not provided, the glass surface may be exposed, and cracking may occur when there is a drop impact or the like. In addition, even when static pressure is applied with a strong load, the glass may bend and break. However, in the second embodiment having the self-healing resin layer 18, the self-healing resin layer 18 has an effect of mitigating a drop impact or a flexure at the time of static pressure, and it is possible to reduce a cracking case. it can.

Further, in order to provide the transparent touch panel 11B itself with rigidity, a support 41 composed of a transparent resin plate may be laminated and used below the lower electrode plate 17F (see FIG. 3). At this time, the self-healing resin layer 1
8 is arranged below the support 41.

As the support 41, it is possible to use 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.

The transparent touch panels 11A, 11B and 11C having the above-mentioned structure are the transparent touch panels 11A, 11B and 11C.
This is suitable for reducing the weight of 11B and 11C.

Further, the transparent touch panels 11A, 11B,
As 11C, different types such as a capacitance type and an optical type may be used.

Transparent touch panels 11A, 11B, 11C
On the lower surface of the transparent, flexible self-healing resin layer 1
8 is formed. The touch panel devices 10A, 10B, and 10C bend due to a load applied by an input pen or a finger,
When the lower surface of the touch panel devices 10A, 10B, 10C and the prism 21a on the upper surface of the light guide plate 21 having the fine uneven shape of the front light device 20 located below the touch panel devices 10A, 10B, 10C are brought into contact with each other, As shown in FIGS. 6 and 7, the self-healing resin layer 18 is actively scratched at the time of contact by scratching or denting the part of the upper surface of the light guide plate 21 where the tip of the prism 21a contacts. It is damaged and has a function of protecting the fine uneven shape of the prism 21a. The prism 21a
As shown in FIG. 8, the portion of the self-healing resin layer 18 in which the tip of the self-healing resin has scratched or dented, as shown in FIG. Restore. Further, in the present invention, the term "prism 21a" is used as a general term for the fine concavo-convex shape formed on the upper surface of the light guide plate 21 to exert the light diffusion function.

The self-healing resin layer 18 is required to have high transparency so as not to reduce 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. Also, if the thickness of the self-healing resin layer 18 is increased, the distance between the surfaces of the touch panel devices 10A, 10B, 10C and the liquid crystal display device 30 is increased, the parallax is increased, and the visibility is reduced, which is not appropriate. is there.

The self-healing resin layer 18 is positively scratched and damaged by impact, but it is necessary for the self-healing resin layer 18 to have flexibility in order to automatically restore with the passage of time. If there is too much property, the shape of the self-healing resin layer 18 itself is deformed, and a visible mark is left on the self-healing resin layer 18 itself, which is inconvenient. Therefore, a certain degree of hardness (pencil hardness (JIS-
K5400 (1990) Hardness to scratch with HB)
In addition, the self-healing resin layer 18 is positively scratched and damaged by an impact, but is flexible enough to be automatically restored with the passage of time, and a material having the above-mentioned flexibility with a thin thickness is used. . The term "scratch" as used herein includes not only a noticeable scratch that is usually visible at a visual level but also a fine scratch that is not visible, which is called in an electronic component.

The self-healing resin is a resin having a function of allowing the elasticity of the resin to restore it over time even if some dents or scratches are generated. Resins having such a function include resins having an acrylic or urethane crosslinked structure. When the self-healing resin is used as the self-healing resin layer 18, its thickness is 10 to 50 μm.
m is suitable.

The self-healing resin has a structure such as a cross-linking structure or a network structure, and even if it is deformed, it restores its original shape with the passage of time. At the time of input on the touch panel, pressure is applied to the surface of the touch panel with a finger, a pen or the like, and the surface is also slid. At this time, however, the self-healing resin itself of the self-healing resin layer 18 of the touch panel is deformed, so that the front light device. The damage to the prism 21a of 20 is reduced. Then, with the passage of time, the self-healing resin is restored to the shape before the deformation. Therefore, even if the surface of the touch panel is repeatedly slid, deterioration of the prism 21a of the front light device 20 is not recognized, and the image quality of the liquid crystal display 30 is not deteriorated. In this specification, in order to explain the function of restoring with the passage of time in short words in an easy-to-understand manner, this expression which is likened to “self-healing” of a living body is used.

In order to form the self-healing resin layer 18 into the self-healing resin layer 18, the self-healing resin layer 18 can be formed by applying it to the lower surfaces of the transparent touch panels 11A, 11B and 11C and curing it.

In addition to this, a self-healing resin coating film is applied to the transparent touch panels 11A, 11B and 11C.
The self-healing resin layer 18 may be formed by sticking it to the lower surface of the. That is, PE in advance
A transparent film such as T (polyethylene terephthalate) or PC (polycarbonate) is coated with a self-healing resin by a roll coater or the like, and the self-healing coating film cured by ultraviolet rays or heat is applied to the transparent touch panels 11A, 11B and 11C. You may use what adhered the whole surface to the lower surface through the transparent adhesive.

The liquid crystal display device 1 having such a configuration is a reflection type liquid crystal display device 30 and a front light such as a cordless telephone, a mobile telephone, a calculator, a sub-notebook computer, a PDA, a digital camera, a video camera, and a commercial communication device. A portable electronic device 50A including the device 20;
It can be applied to 50B.

An example of a portable electronic device 50 incorporating the liquid crystal display device 1 of the present invention is shown in FIGS. The portable electronic device 50 realizes an input function by the touch panel device 10 which is a pen input device installed at the top of the liquid crystal display unit. The touch panel device 10 uses at least a reflective liquid crystal display device 30 and a front light device 20 in combination (see FIGS. 1 to 3).

The front light device 20 usually comprises at least a transparent light guide plate 21 and a light source 22 arranged on the end face thereof.

The light guide plate 21 is preferably made of transparent resin. As a transparent resin, transparency,
It is possible to use an acrylonitrile-styrene copolymer resin, a cellulose acetobutyrate resin, a cellulose propionate resin, a polymethylpentene resin, a polycarbonate resin, a polystyrene resin, a polyester resin, etc., which have excellent light guiding properties.

As the shape of the light guide plate 21, a plate-shaped light guide plate 21 having a large number of fine projections formed on the upper surface thereof is used. Examples of the shape of the minute projections include a prism shape, a microlens shape, and a mat shape.

An air layer 40 is disposed between the prism 21a 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, the air layer 40 is required to provide a refractive index of light 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. Because, as shown in FIG. 9 and FIG.
Refractive index of 1a (about 1.5) and refractive index of air layer 40 (1)
With the difference (about 0.5), the light from the light source 22 is reflected by the prism surface 21a, the light falls directly below, and only the light reflected by the reflection plate 49 under the liquid crystal display 30 is emitted from the light guide plate 21. This is because the prism angle and the like are designed to emit light. Therefore, when the air layer 40 is not provided between the prism 21a and the self-healing resin layer 18 of the transparent touch panel 11 (there is no difference in refractive index), light is not properly emitted. The thickness of the air layer 40 is not particularly limited, but is preferably 10 to 100 μm 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.
Is.

The present invention is not limited to the above embodiment, but can be implemented in various other modes.

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

The impact dispersion absorbing layer 318 has flexibility such that the self-healing resin layer 18 is disposed so as to be in contact with the prism 21a of the light guide plate 21 and the prism 21a is self-healing when inputting to the touch panel. When the elastic resin layer 18 is contacted, the impact dispersion absorption layer 318 is dented at a portion corresponding to the contacted portion to absorb the impact from the prism. Therefore, the touch panel devices 10A, 10B, and 10C are bent by the load at the time of inputting with the input pen 51 or a finger, and the self-healing resin layer 1 on the lower surface of the touch panel devices 10A, 10B, and 10C.
8 and the prism 21a on the upper surface of the light guide plate 21 having the fine unevenness of the front light device 20 located below the touch panel devices 10A, 10B, and 10C are in contact with each other, the prism 21a on the upper surface of the light guide plate 21. By denting the portion of the impact dispersion absorbing layer 318 corresponding to the portion of the self-healing resin layer 18 with which the tip of the contact, the pressure at the time of contact is absorbed, and the fine uneven shape of the upper surface of the light guide plate 21 can be more reliably formed. Fulfills the function of protecting. Note that the depressed portion of the impact dispersion absorption layer 318 restores over time due to the flexibility function of the impact dispersion absorption layer 318 itself.

The impact dispersion absorbing layer 318 is required to have high transparency so as not to reduce 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 reason is as follows. In particular, since the liquid crystal display 30 of each of the above embodiments is a reflection 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 emphasized, and there is generally a requirement of 85% or more. Also, when the haze is high, light diffusion occurs and a clear image cannot be obtained,
5% or less is required.

Further, if the thickness of the impact dispersion absorption layer 318 is increased, the distance between the surfaces of the touch panel devices 10A, 10B, 10C and the liquid crystal display 30 is increased, the parallax is increased, and the visibility is reduced, which is inappropriate. Is.

In order to absorb the impact, the impact dispersion absorbing layer 3
It is necessary that 18 has flexibility, but if it is too flexible, the shape of the impact dispersion absorption layer 318 itself is deformed, and a visible mark remains on the impact dispersion absorption layer 318 itself, which is inconvenient. Therefore, a material that has a certain degree of hardness and is flexible enough to absorb an impact and that absorbs an impact with a small thickness is used as the impact dispersion absorption layer 31.
It must be used as 8. Materials having such characteristics include silicone resin and polymer gel.

As the silicone resin, a gel sheet having an adhesive property on the surface is suitable. When a silicone resin is used as the impact dispersion absorption layer 318, its thickness is preferably 50 to 500 μm. The rubber hardness of the silicone resin is 10 to 50 (Japanese Industrial Standard (JIS) K62
53 (1997)) is suitable. Furthermore, 10 to 3
0 is more desirable.

As the polymer gel, acrylic resin, urethane resin, natural polymer material or the like can be used. When a polymer gel is used as the impact dispersion / absorption layer 318, its thickness is preferably 50 to 500 μm.

When the impact dispersion absorbing layer 318 is made of silicone resin, the transparent touch panels 11A, 11B and 11C are used.
The impact dispersion absorption layer 318 can be formed by applying the composition to the lower surface of and curing it. In the case where the polymer gel is used as the impact dispersion / absorption layer 318, the impact dispersion absorption layer 318 is formed by attaching a gel sheet shaped polymer gel to the lower surface of the transparent touch panels 11A, 11B, 11C. can do.

Regarding the hardness and temperature characteristics of the impact dispersion absorbing layer 318, when the dynamic viscoelasticity is measured by thermomechanical analysis (TMA method), the amplitude width at 25 ° C. is required to be 25 μm or more. Further, it is desirable that the amplitude value has little change in the range of low temperature (−20 ° C.) to high temperature (70 ° C.). That is,
It is desirable that the hardness does not change in a wide temperature range, and examples thereof include silicone rubber and acrylic gel. Depending on the case, desired properties may be obtained by laminating different materials. Here, the TMA method means the Japanese Industrial Standard (JI
S) K7196 (1991), which specifies a softening temperature test method based on the penetration mode of thermomechanical analysis (TMA) of thermoplastic films and sheets. What is needle entry mode?
This is a method of measuring the displacement of the test piece due to softening, using the needle-shaped indenter of the device.

A pressure-sensitive adhesive may be used as the impact-dispersion absorbing layer 318, but a material other than the pressure-sensitive adhesive (a material having no adhesiveness such as silicone rubber or urethane) may be used as the impact-dispersing absorbing layer 318. Is.

By properly combining the arbitrary embodiments of the aforementioned various embodiments, the effects possessed by them can be produced.

While the present invention has been fully described in connection with the preferred embodiments with reference to the accompanying drawings, various variations and modifications will be apparent to those skilled in the art. It is to be understood that such variations and modifications are included within the scope of the present invention as defined by the appended claims.

[0063]

(Example) An upper electrode plate made of a transparent film having a thickness of 150 μm having an upper electrode made of ITO formed on the lower surface, a lower electrode made of ITO on the upper surface, and a transparent resin. A peripheral electrode is adhered to a lower electrode plate composed of a transparent film with a thickness of 100 μm on which a spacer (area occupancy 0.1%, height 3 μm) is formed so that both electrodes face each other with a spacer therebetween. The periphery was laminated with a double-sided adhesive tape as a layer.

Then, a thickness of 1.0 is formed on the lower surface of the lower electrode plate.
A polycarbonate plate of mm was bonded on the entire surface via a transparent adhesive material to laminate a support, and a transparent touch panel of a resistance film type was obtained.

Then, a self-healing resin composed of an acrylic resin having a crosslinked structure is applied on the lower surface of the transparent touch panel by a coating method to form a self-healing resin layer to have a thickness of 30 μm. I got the device.

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, one in which a large number of prism lines having a cross section of an isosceles triangle shape were formed on the upper surface of an acrylic resin plate was used. The vertical angle of the triangle is 50 ° and the pitch between the prism lines is 200μ.
m.

Then, a writing pressure (load pressure) of 2.45 N was applied to the central portion of the input surface of the touch panel, and linearly 50 mm in the direction perpendicular to the prism line of the front light device.
When a sliding test was performed to check the front light device and the touch panel device with the light source of the front light device turned on after 100,000 times of sliding back and forth, the appearance of both the front light device and the touch panel device was apparent. No serious scratches occurred.

(Comparative Example) A transparent polyethylene terephthalate film having a thickness of 50 μm was laminated on the lower surface of a transparent touch panel similar to that of Example 1 through a transparent adhesive having a thickness of 25 μm to form a transparent film layer. Formed,
A touch panel device was obtained.

The touch panel device thus obtained was laminated on the upper surface of a front light device similar to that of Example 1, and a sliding test similar to that of Example 1 was carried out. As a result, the prism of the front light was reciprocated 10 times. I got scratches.

[0071]

Since the present invention has the above-mentioned constitution,
It has the following effects.

In the liquid crystal display device of the present invention, a reflective liquid crystal display device, a front light device composed of a transparent light guide plate and a light source arranged on a light entrance surface which is an end face thereof, and a touch panel device are sequentially arranged. In a laminated liquid crystal display device, by configuring the touch panel device such that a transparent and flexible self-healing resin layer is formed on the lower surface of the transparent touch panel, a touch panel device and a 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 an input operation is performed, the upper surface of the light guide plate of the front light device is damaged (that is, electronic parts are not used. There are no visible scratches that cannot be seen). That is, when the prism of the self-healing resin layer is in contact with the self-healing resin layer on the upper surface of the light guide plate, the self-healing resin layer may be scratched or dented. Actively scratches and damages and protects the fine irregularities of the prism (that is, prevents the fine irregularities of the prism from being invisible to the naked eye, which is said in electronic parts). it can.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a liquid crystal display device according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a liquid crystal display device according to a third embodiment of the present invention.

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.

FIG. 6 is a cross-sectional view illustrating a state in which the self-healing resin layer is actively scratched and damaged when inputting on the touch panel device in the first to third embodiments of the present invention.

7 is an enlarged cross-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. 7 due to a change over time.

FIG. 9 is a sectional view of a liquid crystal display device in which a touch panel device and a liquid crystal display panel are incorporated in the embodiment.

FIG. 10 is an explanatory diagram illustrating a state in which an air layer is arranged 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 above embodiment.

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

FIG. 12 is an enlarged cross-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 absorption layer is arranged between the lower surface of the transparent touch panel and the self-healing resin layer in the modified example of the above embodiment.

[Explanation of symbols]

1 Liquid crystal display 10 (10A, 10B, 10C) touch panel device 11 (11A, 11B, 11C) Transparent touch panel 12 Transparent upper electrode plate 13 Transparent upper electrode 14 Spacer 15 Edge adhesive layer 16 Transparent lower electrode 17 Transparent lower electrode plate 18 Transparent self-healing resin layer 20 Front light device 21 Transparent light guide plate 22 Light source 30 Liquid crystal display device 41 transparent support 50A, 50B Portable electronic devices

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2H089 HA18 QA02 SA17 TA11 TA18                       UA09                 2H092 GA62 HA04 NA25 PA07 PA13                       RA10                 5B087 AA04 AB04 CC02 CC12 CC14                       CC20 CC37

Claims (8)

[Claims] 1. A liquid crystal display device in which a reflection type liquid crystal display, a front light device including a transparent light guide plate and a light source arranged on a light incident surface which is an end face thereof, and a touch panel device are sequentially stacked. The touch panel device is configured such that a transparent and flexible self-healing resin layer is disposed on the lower surface of the transparent touch panel, and the self-healing resin layer can contact the prism on the upper surface of the light guide plate. When arranged, the flexibility of the self-healing resin layer prevents damage to the prism by causing scratches in the contacted portion when the prism comes into contact with the self-healing resin layer during input to the touch panel. A liquid crystal display device which is flexible so as to prevent the above-mentioned scratches from being automatically restored over time. 2. The self-healing resin layer has a thickness of 10-5.
The liquid crystal display device according to claim 1, wherein the liquid crystal display device has a thickness of 0 μm. 3. The transparent touch panel according to claim 1, wherein 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 transparent conductive film is made on a surface of a lower electrode plate made of a transparent resin plate. 3. The liquid crystal display according to claim 1, wherein a lower electrode composed of a film and a dot-shaped spacer are provided, and both electrodes are laminated by the spacer so as to face each other with a gap. apparatus. 4. The transparent touch panel, wherein 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 transparent conductive film is made on a surface of a lower electrode plate made of a transparent film. The liquid crystal display device according to any one of claims 1 to 3, wherein a lower electrode and a dot-shaped spacer configured by the above are provided, and both electrodes are laminated by the spacer so as to face each other with a gap therebetween. . 5. 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 transparent conductive film is made on a surface of a lower electrode plate made of a transparent film. A lower electrode and a dot-shaped spacer formed of are provided, and a support made of a transparent resin plate is provided on the back surface of the lower electrode plate,
5. The liquid crystal display device according to claim 1, wherein both electrodes are laminated by the spacer so as to face each other with a gap. 6. The touch panel device according to claim 1, wherein an amplitude width at 25 ° C. is 25 μm or more when the dynamic viscoelasticity of the self-healing resin layer is measured by thermomechanical analysis. 7. The liquid crystal display device according to claim 1, wherein an air layer is present between the prism on the upper surface of the light guide plate and the self-healing resin layer of the touch panel device. 8. A transparent and flexible impact-dispersion absorption layer is disposed between the lower surface of the transparent touch panel and the self-healing resin layer, and the flexibility of the impact-dispersion absorption layer is the self-healing resin. When the layer is disposed so as to be contactable with the prism of the light guide plate and the prism contacts the self-healing resin layer during input to the touch panel, the portion corresponding to the contacted portion is dented to thereby cause A flexible structure that absorbs impact.
The liquid crystal display device according to any one of 1.