JPH1115007A - Liquid crystal display element and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent warpage of a liquid crystal display element caused by thermal expansion and contraction of a flexible substrate by forming a transparent electrode with a predetermined angle to a long side direction or a short side direction of the flexible substrate. SOLUTION: A transparent electrode 2 is formed on a flexible substrate with the direction of the stripes angled 45 degrees to a long side direction or a short side direction of the flexible substrate, and a transparent electrode 5 is formed on a flexible substrate 4 with the direction of the stripes angled 45 degrees to a long side direction or a short side direction of the flexible substrate 4. The flexible substrate is cut into a specified form, and an alignment layer film 20 is printed on the substrate and is processed with an alignment layer treatment into panel substrates 3, 6. Spacers 21 are scattered on the alignment layer 20, and the panel, 6 is coated with a sealing material 22. The panel substrates 3, 6 are bonded so that the transparent electrodes 2, 5 are orthogonal to each other. The sealing member is irradiated with light of 380 nm wavelength or longer through a filter 23 for curing. Next, liquid crystal is filled in.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid crystal display device and a method for manufacturing the same. More specifically, the present invention relates to a liquid crystal display element in which a transparent electrode is formed on two flexible substrates, and the transparent electrodes are opposed to each other so as to be orthogonal to each other, and a method of manufacturing the same.

[0002]

2. Description of the Related Art A method of manufacturing a liquid crystal display device using a substrate made of a flexible base material includes a method of heating and fixing the upper and lower polarizing plates (Japanese Unexamined Patent Publication No. 6-67172) and a method of manufacturing a polarizing plate. A method in which the elongation of the plastic film is larger than the elongation (Japanese Patent Application Laid-Open No. 6-208108), and a method in which a liquid crystal panel is formed and then annealed by applying pressure (Japanese Patent Application Laid-Open No.
-5406), a method of providing the same thermal expansion coefficient of upper and lower films by providing slits (Japanese Patent Laid-Open No. 7-56129),
A method in which a plastic substrate is formed with a radius of curvature that becomes flat at room temperature, and a transparent conductive film is formed on a concave surface of the plastic substrate and flattened (Japanese Unexamined Patent Publication No. Hei 7-64067), A method in which a coating layer is provided with a difference in film thickness on the surface and a method in which a transparent conductive film is provided on both surfaces of a plastic substrate and a pattern is formed on one surface and the other surface is completely peeled off (Japanese Patent Application Laid-Open No. H7-175053). 7-175
055) and a method using a sealing material in which a curing reaction proceeds at room temperature (JP-A-7-234411).

[0003]

However, the method of attaching the upper and lower polarizing plates after heat treatment has a problem that the characteristics of the polarizing plates are deteriorated.

Further, in the method of making the plastic film stretch larger than the polarizing plate, there is a problem that the uniformity of the display is deteriorated in the STN display because the cell gap slightly changes.

Further, in the method of annealing by applying pressure after the liquid crystal panel is formed, there is a problem that the distortion of the substrate is reduced, but the warpage of the liquid crystal display element cannot be eliminated.

Further, a method of forming a plastic substrate with a radius of curvature that becomes flat at room temperature and forming a transparent conductive film on a concave surface of the plastic substrate to flatten the plastic substrate, and a method of forming a transparent conductive film on the other surface with the other surface. The method of providing a coating layer with a difference in film thickness or the method of using a sealing material in which a curing reaction proceeds at room temperature has a problem that production efficiency is poor.

Further, there is a problem that the flexible substrate has a characteristic of absorbing ultraviolet rays, discoloring and deteriorating, and cannot use an adhesive cured by ultraviolet rays.

Further, there is a problem that a conventional liquid crystal display device using a flexible substrate becomes expensive when provided on the market.

Therefore, the present invention is to overcome such problems of the prior art, and an object of the present invention is to prevent a liquid crystal display element from warping due to thermal expansion or thermal contraction of a flexible substrate. Another object of the present invention is to provide a method of manufacturing a liquid crystal display element for efficiently manufacturing a liquid crystal display element by eliminating discoloration and deterioration of a flexible substrate due to ultraviolet irradiation, and to provide a low-cost liquid crystal display element. It is in.

[0010]

The liquid crystal display element of the present invention is formed on a first transparent electrode formed on a first flexible substrate and on a second flexible substrate. A liquid crystal display element in which a transparent electrode and a transparent electrode are arranged so as to be orthogonal to each other, wherein the first transparent electrode forms a first predetermined angle with a long side direction or a short side direction of the first flexible base material. It is characterized by being formed by attaching. At this time, the first predetermined angle is 5 ° or more and 85 or more.
° or less, more preferably 30 ° or more 60 °
It is good to be the following. Further, the second predetermined angle is preferably not less than 5 ° and not more than 85 °, and more preferably not less than 30 ° and not more than 60 °.

In general, deformation such as warpage generated in a flexible base material due to thermal expansion or thermal contraction is small in a direction parallel to a direction in which a stripe-shaped transparent electrode such as ITO is formed, and is small in a direction perpendicular to the direction. large. This is because electrode materials such as ITO are more resistant to heat than flexible substrates. In the liquid crystal display element of the present invention, since the transparent electrode is formed at a first predetermined angle with respect to the long side direction or the short side direction of the first flexible base material, The deformation occurring in the long side direction and the deformation occurring in the short side direction become uniform. As a result, it is possible to prevent the deformation of the base material due to the difference in the deformation on the long and short sides,
No misalignment during manufacturing. Further, since the first transparent electrode and the second transparent electrode are arranged so as to be orthogonal to each other, the deformation of the substrate caused by the upper substrate and the lower substrate of the liquid crystal display element is alleviated. The warpage of the display element can be prevented.

Further, in the method of manufacturing a liquid crystal display element according to the present invention, the first transparent electrode is formed at a first predetermined angle with a long side direction or a short side direction of the first flexible base material. Forming the first transparent electrode and the first transparent electrode and the first transparent electrode so that the second transparent electrode formed on the second flexible substrate is orthogonal to the first transparent electrode. And disposing the second transparent electrode so as to face the second transparent electrode. At this time, the first predetermined angle is preferably 5 ° or more and 85 ° or less, and more preferably 30 ° to 60 °.

The second transparent electrode is formed on the second flexible substrate at a second predetermined angle with respect to a long side direction or a short side direction of the second flexible substrate. May further be included. At this time, the second predetermined angle is preferably 5 ° or more and 85 ° or less, more preferably 30 ° or more.
It is good to make an angle of 60 °.

Further, the method may further include a step of applying a light-hardening seal member around at least one of the first transparent electrode and the second transparent electrode, and a step of curing the seal member. . At this time, the sealing member is cured by irradiating light having a wavelength of 380 nm to 450 nm. With the above structure, the sealing member is cured by light, so that deformation of the panel substrate caused by heat can be prevented. Further, since light of 380 nm to 450 nm is used, discoloration / deterioration of the panel substrate due to ultraviolet rays can be prevented. Can be eliminated.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIGS. 1, 2, 3 and 10 illustrate a first embodiment of the present invention. FIG. 1 is a schematic view after forming a transparent electrode, and FIG. FIG. 3 is a schematic view before and after the bonding step, FIG. 3 is a schematic view of each manufacturing step of the liquid crystal display element, and FIG. 10 is a schematic perspective view of the completed liquid crystal display element. This will be described with reference to FIGS. 1, 2, 3, and 10.

First, the stripe direction of the transparent electrode 2 such as ITO is formed on the flexible substrate 1 (for example, Amorix film AM7015C manufactured by Fujimori Kogyo Co., Ltd.) in the long side direction 7 or the short side direction of the flexible substrate 1. 8 at an angle of 45 degrees, and the direction of the stripe of the transparent electrode 5 on the flexible substrate 4 is 45 degrees more than the long side direction 9 or the short side direction 10 of the flexible substrate 4.
It is formed by photoetching at an angle (FIGS. 1 and 3A).

Thereafter, the flexible substrates 1 and 4 are cut into the shape shown in FIG. 2, and an alignment film 20 (for example, STX-24 manufactured by Hitachi Chemical Co., Ltd.) is printed on the substrate at a thickness of about 500.degree. , Baked at 130 ° C. for 2 hours, and subjected to an alignment treatment by rubbing to obtain panel substrates 3 and 6. (FIG. 3 (b)).

Next, a 6.5 μm spacer 21 (for example, AW manufactured by Catalyst Kasei Co., Ltd.)
-II) by the electrostatic spraying method, and the sealing material 22 (for example, TB-3025 manufactured by Three Bond Co., Ltd.) is applied to the panel substrate 6.
Is applied by a dispenser application method (FIG. 3).
(C)).

Next, the panel substrates 3 and 6 are bonded so that the transparent electrodes 2 and 5 are orthogonal to each other (FIGS. 3D and 5).

Next, pressure is applied to a predetermined cell gap,
A high-pressure mercury lamp 24 (for example, OHD manufactured by Oak Manufacturing Co., Ltd.) via a filter 23 (for example, a band-pass filter manufactured by Oak Manufacturing Co., Ltd.) that cuts light of less than 380 nm.
-320M irradiator and HSL-300 lamp)
Light of a wavelength of 80 nm or more is applied to cure the seal member (FIG. 3E).

Next, liquid crystal was injected to complete a liquid crystal display device (FIG. 3 (f) and FIG. 10).

The completed liquid crystal display element was a liquid crystal display element having no warpage due to the influence of heat shrinkage of the panel substrate and no reduction in display quality due to deterioration of the panel substrate due to ultraviolet rays.

(Embodiment 2) FIGS. 3, 4, 5, and 11 illustrate a second embodiment of the present invention. FIG. 3 is a schematic view of each manufacturing process of a liquid crystal display device. And
FIG. 4 is a schematic view after the formation of the transparent electrode, FIG. 5 is a schematic view before and after the bonding step, and FIG. 11 is a schematic perspective view of the completed liquid crystal display element. This will be described with reference to FIGS. 3, 4, 5, and 11.

First, the stripe direction of the transparent electrode on the flexible substrate 1 (for example, transparent conductive film FST-534X manufactured by Sumitomo Bakelite Co., Ltd.) is 30 degrees from the long side direction 7 of the first flexible substrate. And the direction of the stripe of the transparent electrode 5 is formed on the flexible substrate 4 by photoetching at an angle of 60 degrees from the long side direction 9 of the flexible substrate 4 ( 3 (a) and 4). Thereafter, the flexible substrates 1 and 4 are cut into the shape shown in FIG. 5, and an alignment film 20 (for example, STX- manufactured by Hitachi Chemical Co., Ltd.) is formed on the substrate.
24) is printed at a thickness of about 500 ° by a printing method, and 130
The substrate was baked at 2 ° C. for 2 hours and subjected to an alignment treatment by rubbing to obtain panel substrates 3 and 6. (FIG. 3 (b)).

Next, 6.5 μm spacers 21 (for example, AW manufactured by Catalyst Kasei Co., Ltd.) are maintained on the alignment film 20 at a constant interval.
-II) is sprayed by an electrostatic spraying method, and the sealing member 22 (for example, TB-302 manufactured by Three Bond Co., Ltd.) is applied to the panel substrate 6.
5) is applied by a dispenser application method (FIG. 3)
(C)).

Next, the panel substrates 3 and 6 are bonded so that the transparent electrodes 2 and 5 are orthogonal to each other (FIGS. 3D and 5).

Next, pressure is applied to a predetermined cell gap,
A high-pressure mercury lamp 24 (for example, OHD manufactured by Oak Manufacturing Co., Ltd.) via a filter 23 (for example, a band-pass filter manufactured by Oak Manufacturing Co., Ltd.) that cuts light of less than 380 nm.
-320M irradiator and HSL-300 lamp)
Light of a wavelength of 80 nm or more is applied to cure the seal member (FIG. 3E).

Next, liquid crystal was injected to complete a liquid crystal display device (FIG. 3 (f) and FIG. 11).

The completed liquid crystal display element was a liquid crystal display element having no warpage due to the shrinkage of the panel substrate due to heat and no deterioration in display quality due to deterioration of the panel substrate due to ultraviolet rays.

(Embodiment 3) FIGS. 3, 6, 7 and 12 illustrate a third embodiment of the present invention. FIG. 3 is a schematic view of each manufacturing process of a liquid crystal display device. And
FIG. 6 is a schematic view after the formation of the transparent electrode, FIG. 7 is a schematic view before and after the bonding step, and FIG. 12 is a schematic perspective view of the completed liquid crystal display element. This will be described with reference to FIGS. 3, 6, 7 and 12.

First, on the flexible substrate 1 (for example, Amorix film AM7015C manufactured by Fujimori Kogyo Co., Ltd.), the stripe direction of the transparent electrode 2 is 60 from the short side direction 8 of the flexible substrate.
The transparent electrode 5 on the flexible substrate 4 at an angle.
The direction of the stripe is 3 from the long side direction 9 of the flexible substrate 4.
It is formed by photoetching at an angle of 0 degrees (FIGS. 3A and 6). Thereafter, the flexible substrates 1 and 4 are cut into the shape shown in FIG. 7, and an alignment film 20 (for example, STX-24 manufactured by Hitachi Chemical Co., Ltd.) is printed on the panel substrate at a thickness of about 500 ° by a printing method. Then, the resultant is baked at 130 ° C. for 2 hours and subjected to an alignment treatment by rubbing to obtain panel substrates 3 and 6. (FIG. 3 (b)).

Next, 6.5 μm spacers 21 (for example, AW manufactured by Catalyst Kasei Co., Ltd.) are maintained on the alignment film 20 at regular intervals.
-II) is sprayed by an electrostatic spraying method, and the sealing member 22 (for example, TB-302 manufactured by Three Bond Co., Ltd.) is formed on the panel substrate 6.
5) is applied by a dispenser application method (FIG. 3)
(C)).

Next, the panel substrates 3 and 6 are bonded so that the transparent electrodes 2 and 5 are orthogonal to each other (FIGS. 3D and 7).

Next, pressure is applied to a predetermined cell gap,
A high-pressure mercury lamp 24 (for example, OHD manufactured by Oak Manufacturing Co., Ltd.) via a filter 23 (for example, a band-pass filter manufactured by Oak Manufacturing Co., Ltd.) that cuts light of less than 380 nm.
-320M irradiator and HSL-300 lamp)
The sealing material is cured by irradiating light having a wavelength of 80 nm or more (FIG. 3E).

Next, liquid crystal was injected to complete a liquid crystal display device. (FIG. 3 (f)) The completed liquid crystal display element was a liquid crystal display element having no warpage due to shrinkage of the panel substrate due to heat and no deterioration in display quality due to deterioration of the panel substrate due to ultraviolet rays.

(Embodiment 4) FIGS. 3, 8, 9 and 13 illustrate a second embodiment of the present invention. FIG. 3 is a schematic view of each manufacturing process of a liquid crystal display device. And
FIG. 8 is a schematic view after forming the electrode group, FIG. 9 is a schematic view before and after the bonding step, and FIG. 13 is a schematic perspective view of the completed liquid crystal display element. 3 and 8, 9 and 1
3 will be described.

First, the first flexible substrate 1 (for example, a transparent conductive film FST-534 manufactured by Sumitomo Bakelite Co., Ltd.)
X) The stripe direction of the first electrode group 2 is at an angle of 45 degrees on the short side direction 8 of the first flexible substrate, and
The stripe direction of the second electrode group 5 is formed on the second flexible substrate 4 by photoetching at an angle of 45 degrees from the short side direction 10 of the second flexible substrate 4 (FIG. 3
(A) and FIG. 8). Thereafter, the flexible substrates 1 and 4 are cut into the shape shown in FIG. 5 or 11, and an alignment film 20 (for example, STX-24 manufactured by Hitachi Chemical Co., Ltd.) is formed on the panel substrate by a printing method at a thickness of about 500 °. Printing at 130 ° C 2
The substrate is baked for a time and subjected to an alignment treatment by rubbing to obtain panel substrates 3 and 6. (FIG. 3 (b)).

Next, 6.5 μm spacers 21 (for example, AW manufactured by Catalyst Kasei Co., Ltd.) are maintained on the alignment film 20 at regular intervals.
-II) is sprayed by an electrostatic spraying method, and the sealing member 22 (for example, TB-302 manufactured by Three Bond Co., Ltd.) is applied to the panel substrate 6.
5) is applied by a dispenser application method (FIG. 3)
(C)).

Next, the panel substrates 3 and 6 are bonded so that the transparent electrodes 2 and 5 are orthogonal to each other (FIG. 3D and FIG. 9).

Next, pressure is applied to a predetermined cell gap,
A high-pressure mercury lamp 24 (for example, OHD manufactured by Oak Manufacturing Co., Ltd.) via a filter 23 (for example, a band-pass filter manufactured by Oak Manufacturing Co., Ltd.) that cuts light of less than 380 nm.
-320M irradiator and HSL-300 lamp)
The sealing material is cured by irradiating light having a wavelength of 80 nm or more (FIG. 3E).

Next, liquid crystal was injected to complete a liquid crystal display device (FIG. 3 (f) and FIG. 13).

The completed liquid crystal display element was a liquid crystal display element having no warpage due to the shrinkage of the flexible substrate due to heat and no deterioration in display quality due to deterioration of the panel substrate due to ultraviolet rays.

Example 5 A liquid crystal display device was manufactured using the method for manufacturing a liquid crystal display device of Example 1.

The manufactured liquid crystal display element has no warpage due to the heat shrinkage of the flexible substrate, has no deterioration in display quality due to deterioration of the panel substrate due to ultraviolet rays, and has the same display characteristics. Was also cheap.

Example 6 A liquid crystal display device was manufactured using the method for manufacturing a liquid crystal display device of Example 2.

The manufactured liquid crystal display element has no warpage due to the thermal shrinkage of the panel substrate, has no deterioration in display quality due to deterioration of the panel substrate due to ultraviolet rays, has the same display characteristics, and is less expensive than the conventional one. Met.

Example 7 A liquid crystal display device was manufactured using the method for manufacturing a liquid crystal display device of Example 3.

The manufactured liquid crystal display element has no warpage due to the heat shrinkage of the panel substrate, has no deterioration in display quality due to deterioration of the panel substrate due to ultraviolet rays, has the same display characteristics, and is less expensive than the conventional one. Met.

Example 8 A liquid crystal display device was manufactured using the method for manufacturing a liquid crystal display device of Example 4.

The produced liquid crystal display element has no warpage due to the thermal shrinkage of the panel substrate, has no deterioration in display quality due to deterioration of the panel substrate due to ultraviolet rays, has the same display characteristics, and is less expensive than the conventional one. Met.

[Brief description of the drawings]

FIG. 1 is a schematic diagram after a transparent electrode is formed on a flexible substrate in Example 1.

FIG. 2 is a schematic perspective view before and after a bonding step in Example 1.

FIG. 3 is a schematic view of a manufacturing process of a liquid crystal display element using a panel substrate.

FIG. 4 is a schematic view after forming a transparent electrode on a flexible base material in Example 2.

FIG. 5 is a schematic perspective view before and after a bonding step in a second embodiment.

FIG. 6 is a schematic view after forming a transparent electrode on a flexible substrate in Example 3.

FIG. 7 is a schematic perspective view before and after a bonding step in a third embodiment.

FIG. 8 is a schematic view after forming a transparent electrode on a flexible substrate in Example 4.

FIG. 9 is a schematic perspective view before and after a bonding step in a fourth embodiment.

FIG. 10 is a schematic perspective view of a completed liquid crystal display element in Example 1.

FIG. 11 is a schematic perspective view of a completed liquid crystal display element in Example 2.

FIG. 12 is a schematic perspective view of a completed liquid crystal display element in Example 3.

FIG. 13 is a schematic perspective view of a completed liquid crystal display element in Example 4.

[Explanation of symbols]

 1. Flexible substrate 2. Transparent electrode 3. Panel substrate 4. Flexible substrate 5. Transparent electrode 6. Panel substrate 7. 7. Long side direction of flexible base material 8. Short side direction of flexible base material 9. Long side direction of flexible base material 19. Short side direction of flexible base material Alignment film 22. Seal member

Claims (10)

[Claims] 1. A first transparent electrode formed on a first flexible base and a second transparent electrode formed on a second flexible base are opposed to each other so as to be orthogonal to each other. A liquid crystal display element disposed, wherein the first transparent electrode is formed at a first predetermined angle with a long side direction or a short side direction of the first flexible base material. Liquid crystal display device. 2. The liquid crystal display device according to claim 1, wherein
The liquid crystal display element, wherein the second transparent electrode is formed at a second predetermined angle with respect to a long side direction or a short side direction of the second flexible base material. 3. The liquid crystal display device according to claim 1, wherein said first predetermined angle is not less than 5 ° and not more than 85 °. 4. The liquid crystal display device according to claim 2, wherein said second predetermined angle is not less than 5 ° and not more than 85 °. 5. A step of forming a first transparent electrode on the first flexible substrate at a first predetermined angle with respect to a long side direction or a short side direction of the first flexible substrate. And the first transparent electrode and the second transparent electrode are opposed to each other such that the first transparent electrode and the second transparent electrode formed on the second flexible base material are orthogonal to each other. And a method for manufacturing a liquid crystal display element. 6. The method for manufacturing a liquid crystal display device according to claim 5, wherein said first predetermined angle is not less than 5 ° and not more than 85 °. 7. The method for manufacturing a liquid crystal display device according to claim 5, wherein the second transparent electrode is formed by the second transparent electrode.
The method of manufacturing a liquid crystal display element further comprising the step of forming on the second flexible substrate at a second predetermined angle with the long side direction or the short side direction of the flexible substrate. 8. The method for manufacturing a liquid crystal display device according to claim 7, wherein said second predetermined angle is not less than 5 ° and not more than 85 °. 9. A method for manufacturing a liquid crystal display device according to claim 5, wherein a light-hard sealing member is provided around at least one of the first transparent electrode and the second transparent electrode. And a step of curing the seal member. 10. The method for manufacturing a liquid crystal display element according to claim 9, wherein said sealing member is 380 nm to 450 nm.
A method for manufacturing a liquid crystal display element, comprising curing by irradiating the following light.