JP3296665B2 - Liquid crystal display device and information transmission device provided with the liquid crystal display device - Google Patents

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 information on a liquid crystal panel can be easily viewed, and an information transmission device provided with the liquid crystal display device.

[0002]

2. Description of the Related Art Hitherto, various liquid crystal display devices having a liquid crystal panel for displaying information have been proposed. 1 and 2 show an example thereof.

[0005] As shown in FIG. 1, the liquid crystal display device 1 includes a transmission type liquid crystal panel 2. The liquid crystal panel 2 has two glass substrates 2a and 2b on which transparent electrodes are formed and arranged so as to face each other.
A liquid crystal (not shown) is held in a gap between the two glass substrates 2a and 2b. Polarizing plates 3a and 3b (see FIG. 2) are attached to both surfaces of the liquid crystal panel 2, respectively. On the other hand, a backlight device 5 is provided below the liquid crystal panel 2.
As is known, the backlight device 5 includes a fluorescent lamp, a reflector, a diffuser, and a light guide that has been subjected to a surface treatment for luminance uniformity. The panel 2 is configured to be irradiated with uniform luminance.

[0006] The liquid crystal panel 2 and the backlight device 5 are housed in a case 6 as shown in the figure, and a protective plate 7 is attached to the case 6 at a position facing the liquid crystal panel 2. I have. The protective plate is formed of a transparent glass plate to ensure visibility, protects the liquid crystal panel 2, prevents the liquid crystal panel from being disturbed by pressing the panel, and provides a normal display. Is configured to be performed. The gap dimension d between the protection plate 7 and the liquid crystal panel 2 is set to such a size that the protection plate 7 does not contact the liquid crystal panel 2 even if the protection plate 7 is bent.

[0005]

However, in the above-mentioned liquid crystal display device, there is a problem that the display contents of the liquid crystal panel 2 are difficult to recognize because the protective plate 7 easily reflects light on the observation side.

Since the gap d between the protection plate 7 and the liquid crystal panel 2 is set to a predetermined value or more as described above,
There is a problem that the display content of the liquid crystal panel 2 is blurred and cannot be clearly recognized.

The diffusion surface has irregularities on the surface. However, depending on the size of the irregularities, the display quality may be degraded or a sufficient antiglare effect may not be obtained. In our experiments, if the average distance between the irregularities on the diffusion surface is more than half of the minimum pixel width of the liquid crystal cell, optical unevenness will occur between the diffusion surface and the pixels, and the display will appear glare. Decrease quality. Regardless of the size of the pixel, if the average distance between the irregularities on the diffusion surface is smaller than 20 μm, the light reflected on the diffusion surface will not be sufficiently diffused, and the contour of the reflected image will be clearly reflected, and sufficient anti-glare effect will be obtained. There was a problem that the effect could not be obtained.

[0008] Accordingly, the present invention provides a polarizing member surface,
It is an object of the present invention to provide a liquid crystal display device that improves the visibility of a liquid crystal panel by performing a diffusion process on both surfaces of a chemically strengthened glass , and an information transmission device including the liquid crystal display device.

Further, the present invention provides a method for reducing the amount of deflection.
A liquid crystal display device and a liquid crystal display device, wherein the gap between the glass and the liquid crystal panel is reduced by utilizing the properties of chemically strengthened glass so that the display contents of the liquid crystal panel can be clearly recognized. It is an object to provide an information transmission device.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has an object to provide a liquid crystal panel formed by holding liquid crystal between a pair of substrates and displaying information, and a liquid crystal panel facing the liquid crystal panel. a chemically tempered glass which is arranged to, in the above liquid crystal display device and a polarizing member that is attached to a surface opposite to the chemically tempered glass of the liquid crystal panel, haze said chemically tempered glass of the polarization member So that the degree of haze is greater than the surface of the polarizing member, and
It is characterized in that both sides of chemically strengthened glass are subjected to diffusion treatment. In this case, an optical film that has been subjected to a diffusion treatment may be attached to both surfaces of the chemically strengthened glass . Further, the surface of the polarizing member, and chemically strengthened glass
It is preferable that the average interval between the irregularities on the surface of the liquid crystal is not more than half of the minimum pixel width of the liquid crystal panel and not less than 20 μm. Further, at least one of the both surfaces of the chemically strengthened glass and the surface of the polarizing member may be subjected to a low reflection treatment. Further, it is preferable that the liquid crystal is a ferroelectric liquid crystal.

On the other hand, an information transmitting apparatus according to the present invention comprises a graphic controller for outputting a data signal and a scanning method signal, a scanning signal control circuit for outputting scanning line address data and a scanning method signal, display data and a scanning method signal. And an information signal control circuit for outputting the information signal, and the above-described liquid crystal display device.

[0012]

Based on the [action] above configuration, even when the liquid crystal panel to display information viewed through the chemically strengthened glass, the chemical strength
Since both surfaces of the fossilized glass and the surface of the polarizing member are subjected to the diffusion treatment, reflection from an external light source is reduced. Therefore, the information displayed on the liquid crystal panel can be clearly recognized. On the other hand, since the liquid crystal panel is covered with the chemically strengthened glass and is not affected by an external force, disturbance of the alignment of the liquid crystal due to the pressing of the liquid crystal panel is avoided.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In addition, the same parts as those shown in FIG.

First, a first embodiment of the present invention will be described with reference to FIG.
It is explained along.

In the liquid crystal display device 20 according to the present embodiment, a polarizing plate 23 is attached to the upper surface of the liquid crystal panel 2 (the surface facing the protective plate 27), and the surface of the polarizing plate 23 is subjected to a diffusion process. It has been subjected. The protective plate 27 used in this embodiment is a glass plate subjected to a chemical strengthening process, and both surfaces thereof are diffused by a chemical process such as a boric acid process, a honing process, a film forming process, or a physical process. Face 27
a, 27b are formed. In this embodiment, the haze of the polarizing plate 23 is set to 25%, and the haze of the protective plate 27 is set to 5%. The haze is set to be larger than the haze of the diffusion surfaces (27a, 27b) arranged at a position distant from the panel. In addition, the above-described diffusion treatment is achieved by finishing the surface with irregularities. In the present embodiment, the average distance between the irregularities of the diffusion surface is set to 20 to 2 with respect to the minimum pixel width of 50 μm of the liquid crystal panel 2.
5 μm (a half or less of the minimum pixel width of 50 μm).

Next, the effect of this embodiment will be described.

According to this embodiment, since the protection plate 27 is disposed on the observation side of the liquid crystal panel 2, the liquid crystal panel is protected in the same manner as in the conventional example, and the disturbance of the orientation of the liquid crystal is reduced.
Good display quality can be ensured. Further, since the surfaces of all the members arranged on the observation side of the liquid crystal panel 2 (that is, the surface of the polarizing plate 23 and both surfaces of the protective plate 27) are subjected to a diffusion treatment, light from an external light source is The reflection is reduced, and the display on the liquid crystal panel 2 is easily recognized. As a result of measurement by the inventor, the liquid crystal display device 2 according to the present embodiment
The reflectance of 0 was 6%, which was confirmed to be reduced to one third or less of the conventional device.

In the case where the degree of haze due to the diffusion process performed as described above is large, generally, if the distance between the liquid crystal panel 2 and the diffusion surface is large, characters and figures displayed on the panel will be blurred. In the present embodiment, since the haze of the polarizing plate 23 attached to the liquid crystal panel 2 is set to be higher than that of the protection plate 27 disposed farther from the panel, Such blurring can be reduced, and as a result, the display contents of the liquid crystal panel can be clearly recognized.

In general, when the shape of the unevenness formed for the diffusion process is rough, optical unevenness occurs in the display and the image looks glare. The anti-glare effect is weakened without blurring the outline. However, in this embodiment, since the average distance between the unevenness of the diffusion surface is set to 20 to 25 μm with respect to the minimum pixel width of 50 μm of the liquid crystal panel 2 as described above, there is no problem as described above, and the display quality is low. Can be favorably maintained.

Next, a second embodiment of the present invention will be described with reference to FIG.
It is explained along.

In this embodiment, a chemically strengthened glass is used for the protective plate 37, and a commercially available non-glare film (material, PET, haze is 5%) 38,
39 is affixed.

The configuration other than the protection plate 37 is the same as that of the first embodiment. That is, the surface of the polarizing plate 23 has been subjected to a diffusion treatment, and its haze is 25%. Further, the shape of the surface subjected to the diffusion processing is such that the average pixel interval of the unevenness is 20 to 2 with respect to the minimum pixel width of 50 μm of the liquid crystal panel.
5 μm.

Next, the effect of this embodiment will be described.

According to this embodiment, the same effect as that of the first embodiment can be obtained. In addition, since the chemically strengthened glass is used for the protection plate 37, the protection plate 37 can be used as compared with a normal glass plate. It is hard to be damaged. Further, since the chemically strengthened glass is less likely to bend than a general glass plate, the protective plate 37
And the liquid crystal panel 2 can be reduced in gap. Therefore,
Blurring of display contents is reduced, and visibility is improved. Further, the degree of haze of the protection plate 37 can be made higher than that of the above-described embodiment by the amount corresponding to the reduction in blur, and in that case, the reflectance is further reduced.

Further, in this embodiment, the protection plate 37
Since the films 38 and 39 are attached to the surface of the protective plate 37, even if a large force acts on the protective plate 37 and the protective plate is damaged, the protective plate is not scattered.

Next, a third embodiment of the present invention will be described with reference to FIG.
It is explained along.

This embodiment has the same structure as that of the first embodiment, except that a low-reflection coating (low-reflection treatment) is applied to the surfaces of the diffusion surfaces formed on the protective plate 27 and the polarizing plate 23. It has been subjected. This coating is a dip,
The coating is performed by a method such as potting, spraying, sol-gel, or vapor deposition, and the coating layer is formed in a single layer or a multilayer.

Next, the effect of this embodiment will be described.

According to this embodiment, the same effects as those of the above embodiments can be obtained, and the reflectance can be further reduced as compared with the above embodiments. According to actual measurements made by the inventor, the reflectance was about 6% of that of the conventional example.
It has become one-half.

Finally, an information transmitting device 400 including the liquid crystal display devices 20,... Will be described with reference to FIG.

The liquid crystal display device 2 described in the above embodiment
0, ..., as shown in FIG.
2 and an information signal applying circuit 403 are connected to each other.
The information signal control circuit 406, the drive control circuit 405, and the graphic controller 407 are connected in this order. Then, the data and the scanning method signal are transmitted from the graphic controller 407 to the scanning signal control circuit 404 and the information signal control circuit 406 via the drive control circuit 405. The data is converted into address data and display data by these circuits 404 and 406, and the other scanning method signal is
The data is sent to the scanning signal application circuit 402 and the information signal application circuit 403 as they are. Further, the scanning signal applying circuit 402 applies a scanning signal having a waveform determined by the scanning method signal to the scanning electrode determined by the address data. It is configured to apply an information signal having a waveform determined by two system signals.

[0032]

As described above, according to the present invention,
Since the chemically strengthened glass is arranged to face the liquid crystal panel, the liquid crystal panel is protected. Therefore,
The display quality of the liquid crystal panel is favorably maintained without the liquid crystal panel being pressed and the alignment of the liquid crystal being disturbed. In addition, since the surface of the polarizing member and the both surfaces of the chemically strengthened glass are subjected to diffusion treatment, the reflection of light from an external light source is reduced, and the display contents of the liquid crystal panel can be easily recognized and the visibility is improved. You. Moreover, haze of the polarizing member said of
Since the degree of haze is larger than that of the chemically strengthened glass , the display content of the liquid crystal panel can be clearly recognized, and the visibility thereof is ensured.
On the other hand, on both sides of the chemically reinforced glass, when attached optical film subjected to diffusion treatment, even the chemically tempered glass is broken temporarily acts large force to chemically tempered glass, the scattering of the chemically strengthened glass Can be prevented. Further, when the average distance between the irregularities on the surface of the polarizing member and the surface of the chemically strengthened glass is less than half the minimum pixel width of the liquid crystal panel and more than 20 μm, the reflection of the external light source After reducing the rate, preventing the occurrence of optical unevenness,
Visibility can be secured. Further, when at least one of the both surfaces of the chemically strengthened glass and the surface of the polarizing member is subjected to a low reflection treatment, the reflectance of the external light source can be further reduced, and the visibility is further improved. Is improved. Also, chemical strength
Since the glass is used, the glass is hardly damaged.
Furthermore, since the chemically strengthened glass has a small amount of bending, the gap between the chemically strengthened glass and the liquid crystal panel can be reduced, and as a result, the display contents of the liquid crystal panel can be clearly recognized. Further, it is possible to increase the haze of the chemically strengthened glass, and when the haze is increased, the visibility is further improved.

On the other hand, when the optical film subjected to the diffusion treatment is attached to both sides of the plate-like member, even if a large force acts on the plate-like member and the plate-like member is damaged, the plate-like member is damaged. The scattering of the members can be prevented.

Further, when the haze of the polarizing member is made larger than the haze of the plate-like member, the display contents of the liquid crystal panel can be clearly recognized, and the visibility can be ensured.

Further, when the average distance between the irregularities on the surface of the polarizing member and the surface of the plate-like member is set to not more than half of the minimum pixel width of the liquid crystal panel and not less than 20 μm, After reducing the reflectance of the light source, the occurrence of optical unevenness can be prevented, and visibility can be ensured.

Further, when a low reflection treatment is applied to at least one of the both surfaces of the plate member and the surface of the polarizing plate, the reflectance of the external light source can be further reduced, and the visibility is further improved. improves.

Further, when the plate-like member is made of chemically strengthened glass, it is hardly damaged. further,
Since such chemically strengthened glass has a small amount of bending, the gap between the plate member and the liquid crystal panel can be reduced, and as a result, the display contents of the liquid crystal panel can be clearly recognized. Further, it becomes possible to increase the degree of haze of the plate-shaped member, and when the degree of haze is increased, the visibility is further improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a structure of a liquid crystal display device.

FIG. 2 is a detailed cross-sectional view for explaining a conventional problem.

FIG. 3 is a sectional view showing the structure of the liquid crystal display device according to the first embodiment of the present invention.

FIG. 4 is a sectional view showing a structure of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 5 is a sectional view showing a structure of a liquid crystal display according to a third embodiment of the present invention.

FIG. 6 is a block diagram illustrating peripheral circuits of a liquid crystal display device.

[Explanation of symbols]

 Reference Signs List 1 liquid crystal display device 2 liquid crystal panel 2a, 2b glass substrate (substrate) 3a polarizing plate (polarizing member) 5 backlight device 7Protection plate  Reference Signs List 20 liquid crystal display device 23 polarizing plate (polarizing member) 27Protection plate  30 Liquid crystal display device 37Protection plate  38, 39 Non-glare film (optical film) 40 Liquid crystal display device 400 Information transmission device 404 Scanning signal control circuit 406 Information signal control circuit 407 Graphic controller

Continuation of the front page (72) Inventor Nao Tajima 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (56) References JP-A-6-148621 (JP, A) JP-A-61-230125 ( JP, A) JP-A-3-120037 (JP, A) JP-A-61-249023 (JP, A) JP-A-5-32431 (JP, A) JP-B-62-38288 (JP, B2) (58) ) Surveyed field (Int.Cl. ⁷ , DB name) G02F 1/1335

Claims (7)

(57) [Claims] A liquid crystal panel 1. A are formed by holding a liquid crystal between a pair of substrates for displaying information, and chemically tempered glass which is arranged to confront the liquid crystal panel, the chemically strengthened glass in the liquid crystal panel the liquid crystal display device and a polarizing member that is affixed on a surface facing the said as haze of the polarizing member is larger than the haze of the chemically tempered glass, the surface of the polarization member, and chemical
A liquid crystal display device, characterized in that both sides of a tempered glass are subjected to a diffusion treatment. 2. The liquid crystal display device according to claim 1, wherein an optical film subjected to a diffusion treatment is attached to both surfaces of the chemically strengthened glass . 3. The surface of the polarizing member and a chemically strengthened glass.
3. The liquid crystal display device according to claim 1, wherein an average interval of the irregularities on the surface of the liquid crystal is equal to or less than half of a minimum pixel width of the liquid crystal panel and is equal to or greater than 20 μm. 4. Both surfaces of the chemically strengthened glass and a polarizing portion
The liquid crystal display device according to claim 1, wherein at least one of the surfaces of the material is subjected to a low reflection treatment. Wherein said liquid crystal is strong is ferroelectric liquid crystal, the liquid crystal display device of any one of claims 1 to 4, characterized in that. 6. The method of claim 1 or 5 wherein the polarization member is said chemically tempered glass with the <br/> disposed in contact with the liquid crystal panel is disposed at a position away from the liquid crystal panel, it is characterized by The liquid crystal display device according to any one of the above. 7. A graphic controller that outputs a data signal and a scanning method signal, a scanning signal control circuit that outputs scanning line address data and a scanning method signal, an information signal control circuit that outputs display data and a scanning method signal, and a liquid crystal display device according to any one of claims 1 to 6, the information transmission device, characterized in that.