JPH0729530U - Liquid crystal cell - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if a liquid crystal cell is subjected to shock or pressure, distortion, cracks, interference fringes, misalignment, etc. are unlikely to occur, reflection on the display surface is difficult, and high contrast and high clarity are achieved. The purpose is to provide a liquid crystal cell of degree. [Structure] Between the polarizing plate and the transparent plate of the liquid crystal cell, between the polarizing plate and the diffusion plate, or between the polarizing plate and the glass substrate, the refractive index is 1.4 to 1.6 and the transmittance is An elastic body having an adhesiveness of 95 to 99% is adhered and laminated so that an air layer does not remain. [Effect] Even if a shock or pressure is applied, the elastic body absorbs the elastic material so that distortion, cracking, interference fringes, misalignment are less likely to occur, and no air layer remains, so the display surface is reflected by the reflected light. However, it is possible to obtain a high contrast and to obtain a high definition of a display image because the transparent plate surface is not roughened.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a liquid crystal cell, which can protect the liquid crystal cell against external impact or pressure in the liquid crystal cell, prevent reflection of external light, and obtain high definition and high contrast. .

[0002]

[Prior art]

 In recent years, liquid crystal display devices have been attracting attention for their features of low power consumption, light weight, and thin shape, and their application fields are expanding. For example, a wide variety of products, such as wristwatches, calculators, LCD TVs, word processors, etc., that have a liquid crystal display part have entered the market. 3 to 6 are cross-sectional views showing a structure of a liquid crystal cell which is a part of liquid crystal used in a conventional display portion.

As an example of the structure of the liquid crystal cell, as shown in FIG. 3, liquid crystal is filled in a liquid crystal part 6 between two glass substrates 5, and a polarizing plate 4 is provided outside each of the two glass substrates 5. A thin antireflection film 1 is vapor-deposited and laminated on the upper surface of the polarizing plate 4 which is adhered and adhered on the upper surface of the glass substrate 5. As another example, FIG. 4 shows another example in which liquid crystal is filled in a liquid crystal part 6 between two glass substrates 5, and a polarizing plate 4 is attached to the outside of each of the two glass substrates 5 and attached to the upper surface of the glass substrate 5. A double-sided tape 11 is fixed to the upper surface of the attached polarizing plate 4, a transparent plate 2 is fixed to the upper surface of the double-sided tape 11, and an air layer 10 is provided between the polarizing plate 4 and the transparent plate 2. The thin antireflection film 1 is vapor-deposited and laminated on the upper surface of the transparent plate 2. FIG. 5 is a cross-sectional view of a transmissive liquid crystal display device in which a tubular light source is attached to the liquid crystal cell shown in FIG. 3, and shows the polarization plate 4 attached to the bottom surface of the glass substrate 5 below the liquid crystal part 6. The bottom surface and the diffuser plate 7 of the transmissive tubular light source 8 are fixed and laminated with a double-sided tape 11, and an air layer 10 exists between the polarizing plate 4 and the diffuser plate 7. As another example, in FIG. 6, liquid crystal is filled in a liquid crystal part 6 between two glass substrates 5, and a polarizing plate 4 is attached to the outside of each of the two glass substrates 5 to form an upper surface of the glass substrate 5. The double-sided tape 11 is fixed on the upper surface of the polarizing plate 4 attached to the transparent plate 13, and the transparent plate 13 is fixed and laminated on the upper surface of the double-sided tape 11. An air layer 10 is present between them, and the surface of the transparent plate 13 is roughened (non-glare treatment).

[0004]

[Problems to be solved by the device]

 In the structure of the liquid crystal cell shown in FIG. 3, a thin antireflection film was vapor-deposited and laminated on the upper surface of the polarizing plate in order to prevent reflection on the display surface, but the liquid crystal cell is distorted due to external impact or pressure. , Cracks, generation of interference fringes, poor orientation, etc. The structure of the liquid crystal cell shown in FIG. 4 is a means for solving the problem caused by external impact or pressure. In this structure, a double-sided tape is fixed to the upper surface of the polarizing plate attached to the upper surface of the glass substrate, a transparent plate is fixed to the upper surface of the double-sided tape, and there is an air layer between the double-sided tape. A thin antireflection film is vapor-deposited and laminated on the top surface, but the refractive index differs greatly from that of the polarizing plate due to the presence of the air layer, and the reflection at the polarizing plate is large, and the display surface is not visible due to the reflected light. Moreover, there is a drawback that the contrast is lowered. FIG. 5 is a cross-sectional view of a transmissive liquid crystal display device in which a tubular light source is attached to the liquid crystal cell shown in FIG. 3, but the bottom surface of the polarizing plate attached to the bottom surface of the glass substrate below the liquid crystal part It is laminated with a double-sided tape that is fixed to the diffuser plate of a tubular light source of the same type, but because of the presence of an air layer, the refractive index is much different from that of the polarizing plate as in the liquid crystal cell shown in FIG. There is a drawback that the reflection is large on the plate and the contrast is lowered by the reflected light from the light from the tubular light source. In the structure of the liquid crystal cell shown in FIG. 6, a double-sided tape is fixed to the upper surface of the polarizing plate attached to the upper surface of the glass substrate, and a transparent plate having a roughened surface is fixed to the upper surface of the double-sided tape and laminated. By doing so, the reflection on the transparent plate is reduced, but since there is an air layer between the polarizing plate and the roughened transparent plate, the refractive index is also greatly different from that of the polarizing plate. There is a problem that the display surface is difficult to see due to the reflected light and the contrast is lowered, and the surface of the transparent plate is roughened, resulting in deterioration of the sharpness of the displayed image. .

The present invention solves such a problem, and its purpose is to prevent distortion, cracking, generation of interference fringes, misalignment, etc. even when an external impact or pressure is applied to the liquid crystal cell. It is an object of the present invention to provide a liquid crystal cell which is hard to generate, and which is unlikely to cause reflection on the display surface, and which has high contrast and high definition.

[0006]

[Means for Solving the Problems]

 In the present invention according to claim 1, a liquid crystal part disposed between two glass substrates and a polarizing plate, an antireflection film and a transparent plate for protecting the liquid crystal are laminated on one of the glass substrates. In the liquid crystal cell, the elastic body is closely attached between the polarizing plate and the transparent plate.

According to a second aspect of the present invention, a liquid crystal part between two glass substrates, one of the glass substrates includes a polarizing plate, an antireflection film and a transparent plate for protecting the liquid crystal. In the liquid crystal cell in which is laminated, an elastic body is closely attached between the glass substrate and the polarizing plate. The invention according to claim 3 is a liquid crystal cell in which a liquid crystal part between two glass substrates and a polarizing plate and a diffusion plate are laminated on one of the glass substrates, A liquid crystal cell in which an elastic body is adhered between the diffusion plate and the diffusion plate.

The present invention according to claim 4 is that the elastic body according to claim 1, 2 or 3 is transparent and has a transmittance of 95 to 99%.

The present invention described in claim 5 is to set the refractive index of the elastic body described in claim 1 or 2 or 3 to 1.4 to 1.6.

In the present invention described in claim 6, the elastic body described in claim 1 or 2 or 3 has an adhesive property.

[0011]

[Action]

 Between the polarizing plate and the transparent plate, which is a part of the liquid crystal cell, or between the polarizing plate and the diffusion plate, the refractive index is almost the same as that of the glass substrate and the polarizing plate, and the transmittance is high, By stacking elastic bodies that have elasticity to absorb impacts and have adhesive properties so that air layers do not remain, they are distorted, cracked, or interfere with interference fringes even if external impact or pressure is applied. It is difficult to cause occurrence of defectiveness and orientation, and it is difficult to cause reflection on the display surface, and high contrast and high definition can be obtained.

[0012]

【Example】

 Hereinafter, a detailed description will be given based on an embodiment of the present invention.

FIG. 1 is a sectional view of the structure of a liquid crystal cell showing one embodiment of the present invention, and FIG. 2 is a sectional view showing a liquid crystal cell of another embodiment when a tubular light source is mounted.

The liquid crystal cell shown in FIG. 1 includes an antireflection film 1, a transparent plate 2, an elastic body 3, a polarizing plate 4, a glass substrate 5, a liquid crystal section 6, and a diffusion plate 7. The structure of the liquid crystal cell is such that the liquid crystal is sealed in the liquid crystal part 6 between the two glass substrates 5, and the polarizing plates 4 are attached to the outsides of the two glass substrates 5, respectively. The transparent elastic body 3 having a high transmissivity is adhered to the upper surface of the polarizing plate 4 attached to the upper surface and the transparent plate 2 so that an air layer is not left between the transparent plate 2 and the adhesive. . Further, a transparent plate 2 made of acrylic resin or the like is fixed to the upper surface of the elastic body 3, and a thin antireflection film 1 is vapor-deposited and laminated on the upper surface of the transparent plate 2. The refractive index and the film thickness of the antireflection film 1 are selected so that the light reflected at the interface between the transparent plate 2 and the transparent plate 2 interferes with each other and disappears to eliminate the reflected light.

The refractive index of the glass substrate 5 and the polarizing plate 4 which are part of the liquid crystal cell actually used is 1.50, and the refractive index when an acrylic resin is used for the transparent plate 2 at this time is If the refractive indexes of 1.49, the elastic body 3 and the transparent plate 2 are in the range of ± 0.1 of 1.4 to 1.6, the antireflection effect is not affected.

The transmittance of the elastic body 3 is preferably 100%, but it is not realistic. Therefore, if it is in the range of 95 to 99%, the contrast is not adversely affected by visual observation.

The elastic body has a refractive index of 1.4 to 1.6, a transmittance of 95 to 99%, has elasticity to absorb external impact and pressure, and is a gel-like silicone that can be adhered with adhesiveness. Suitable is resin.

The gel-like silicone resin is an addition reaction type silicone, and is formed by mixing silicone and an additive, followed by vacuum film foaming and heat-curing. The cross-linked state and molecular structure are three-dimensional reticulated (honeycomb-like). By adopting this structure, it is possible to obtain a transparent and elastic gel-like silicon resin, and the transmittance and refractive index can be arbitrarily selected by appropriately adjusting this network structure.

FIG. 2 is a cross-sectional view of a transmissive liquid crystal display device in which the tubular light source 8 is mounted on the liquid crystal cell shown in FIG. 1, and is attached to the bottom surface of the glass substrate 5 below the liquid crystal portion 6. The elastic body 3 such as a gel-like silicone resin is adhered and laminated between the bottom surface of the polarizing plate 4 and the diffusion plate 7 of the transmissive tubular light source 8 so that an air layer does not remain. Since there is no layer remaining, the tubular light source 8 is effectively irradiated to the display surface, and high brightness is obtained.

The elastic body 3 in close contact with the liquid crystal cell structure of the present invention has been described with respect to the gel-like silicon resin, but the elastic body 3 is not particularly limited, and it is a transparent polarizing plate and a glass having the same refractive index. An elastic body having a refractive index of 1.4 to 1.6, which is substantially the same as the refractive index of the substrate, a transmittance of 95 to 99%, an adhesive property, and elasticity for absorbing an external impact may be used. Further, the liquid crystal structure is not limited to the transmission type and the reflection type irradiation, and the liquid crystal driving method may be any of the simple matrix driving method, the active driving method and the ferroelectric liquid crystal. .

[0021]

[Effect of device]

 As is clear from the above description, the present invention provides a liquid crystal cell having a uniform refractive index between a polarizing plate and a transparent plate, a polarizing plate and a diffusing plate, or a polarizing plate and a glass substrate. By laminating and stacking elastic bodies that have the same refractive index as that of the lath substrate and the polarizing plate and have high transmittance and adhesiveness, the elastic body itself absorbs even when external impact or pressure is applied. Since it has elasticity, distortion, cracking, generation of interference fringes, misalignment, etc. are less likely to occur, and since there is no residual air layer, the problem that the display surface is difficult to see due to reflected light is solved and high contrast is obtained. Further, since it is not necessary to roughen the surface of the transparent plate, it is possible to obtain a high definition of the displayed image.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a structure of a liquid crystal cell showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view when a tubular light source is mounted on the liquid crystal cell shown in FIG.

FIG. 3 is a cross-sectional view showing the structure of a conventional liquid crystal cell.

FIG. 4 is a cross-sectional view showing a structure of a conventional liquid crystal cell.

5 is a cross-sectional view when a tubular light source is mounted on the liquid crystal cell shown in FIG.

FIG. 6 is a cross-sectional view showing a structure of a conventional liquid crystal cell.

[Explanation of symbols]

 1. Antireflection film 2. Transparent plate 3. Elastic body 4. Polarizing plate 5. Glass substrate 6. Liquid crystal part 7. Diffuser 8. Tubular light source 9. Reflector 10. Air layer 11. Double-sided tape 12. Roughened transparent plate

Claims (6)

[Scope of utility model registration request] 1. A liquid crystal cell in which a liquid crystal portion between two glass substrates and a polarizing plate, an antireflection film and a transparent plate for protecting the liquid crystal are laminated on one of the glass substrates. A liquid crystal cell, wherein an elastic body is closely attached between the plate and the transparent plate. 2. A liquid crystal cell in which a liquid crystal portion between two glass substrates and a polarizing plate, an antireflection film and a transparent plate for protecting the liquid crystal are laminated on one of the glass substrates. A liquid crystal cell, wherein an elastic body is adhered between the substrate and the polarizing plate. 3. A liquid crystal cell in which a liquid crystal portion between two glass substrates and a polarizing plate and a diffusion plate are laminated on one of the glass substrates, and the liquid crystal cell is provided between the polarizing plate and the diffusion plate. A liquid crystal cell in which an elastic body is closely attached. 4. The elastic body is transparent and has a transmittance of 95-9.
It is 9%, The liquid crystal cell of Claim 1, 2 or 3. 5. The liquid crystal cell according to claim 1, 2 or 3, wherein the elastic body has a refractive index of 1.4 to 1.6. 6. The elastic body according to claim 1 or 2, which has an adhesive property.
Or the liquid crystal cell according to item 3.