JPH117034A - Liquid crystal display element and production therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent warpage due to the thermal expansion and the thermal contraction of flexible substrates by arranging transparent electrodes arranged on a flexible substrate and transparent electrodes arranged on another substrate while opposing them and making them orthogonally cross. SOLUTION: An electrode group 2 and an electrode group 5 are respectively formed on a flexible substrate 1 and a flexible substrate 4 by a photoetching method so that the stripe direction of the electrode group 2 and the stripe direction of the electrode group 5 respectively become parallel with the long side direction of the substrate 1 and the short side direction of the substrate 4. Next, after the substrates are printed with oriented films 29 and are baked, substrates are subjected to orientation processings. Next, spacers 21 are dispersed on the flexible substrate 1 by an electrostatic dispersing method and sealing material 22 are coated on the flexible substrate 4 by a dispenser coating method. Then, after the substrates 1, 4 are stuck so that the long side direction of the substrate 1 and the short side direction of the substrate 4 orthogonally cross each other and they are made to have a prescribed gap by being pressurized and the sealing material 22 are hardened by a high-pressure mercury-vapor lamp 24 with a filter 23, liquid crystal is poured into the gap.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid crystal display device and a method for manufacturing the same.

[0002]

2. Description of the Related Art A method of manufacturing a liquid crystal display element having a flexible substrate includes a method in which upper and lower polarizing plates are heat-treated and then bonded (Japanese Patent Laid-Open No. 6-67172). A method of increasing the size (JP-A-6-208108), a method of performing an annealing process by applying pressure after forming a liquid crystal panel (JP-A-7-5406),
A method in which slits are provided to make the thermal expansion coefficients of the upper and lower films the same (Japanese Patent Laid-Open No. 7-56129), or a plastic substrate is formed with a radius of curvature that becomes flat at room temperature, and a transparent conductive film is formed on the concave surface of the plastic substrate. (Japanese Patent Laid-Open No. Hei 7-64067), a method of providing a coating layer with a difference in thickness between the surface on which the transparent conductive film is formed and the other surface (Japanese Patent Laid-Open No. 7-175053), A method in which a transparent conductive film is provided on both surfaces and a pattern is formed on one surface and the other surface is completely peeled off (JP-A-7-175055), or a method using a sealing material in which a curing reaction proceeds at room temperature (JP-A-7-175).
234411) has been proposed.

[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 has been a problem that a conventional liquid crystal display device using a flexible substrate is expensive when provided on the market.

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

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]

According to the present invention, there is provided a liquid crystal display element comprising: a first transparent electrode disposed on a first flexible substrate;
A liquid crystal display element in which a second transparent electrode disposed on a second flexible substrate is disposed so as to face the liquid crystal display, wherein the first transparent electrode and the second transparent electrode are substantially orthogonal to each other. It is characterized by doing. At this time, the first transparent electrode is arranged in the same direction as the short side direction of the first flexible substrate, and the second transparent electrode is arranged in the same direction as the short side direction of the second flexible substrate. Alternatively, the first transparent electrode may be disposed in the same direction as the long side direction of the first flexible substrate, and the second transparent electrode may be disposed in the same direction as the long side direction of the second flexible substrate. It may be arranged in the direction. Alternatively, the first transparent electrode is arranged in the same direction as the short side direction of the first flexible substrate, and the second transparent electrode is arranged in the same direction as the short side direction of the second flexible substrate. Is also good.

In general, a flexible substrate is unlikely to shrink in a direction in which a transparent electrode such as ITO is formed, and intersects with a portion where ITO is not formed, that is, is orthogonal to a direction in which ITO is formed. Shrinkage tends to occur in the direction. This is because the flexible substrate is softer than a transparent electrode such as ITO. By using the above-described structure of the present invention, the direction in which the first flexible substrate is unlikely to contract and the direction in which the second flexible substrate is likely to contract are orthogonal to each other, and the second flexible substrate has the second flexibility. Since the direction in which the substrate is unlikely to contract and the direction in which the first flexible substrate is likely to contract are orthogonal to each other, the direction in which the contraction or deformation occurs is relaxed and uniform for the entire liquid crystal display element. Becomes As a result, a liquid crystal display element having stable quality can be provided without providing a special process, which can greatly contribute to reduction in production cost.

Further, the method for manufacturing a liquid crystal element of the present invention is the first method.
The first transparent substrate on which the transparent electrode is disposed and the second transparent electrode on which the second transparent electrode is disposed substantially form the first transparent electrode and the second transparent electrode. The method is characterized in that it includes a step of sticking so as to be orthogonal. At this time, the first transparent electrode is disposed in the same direction as the short side direction of the first flexible substrate, and the second transparent electrode is disposed in the same direction as the long and short side direction of the second flexible substrate. Direction, or the first
May be arranged in the same direction as the long side direction of the first flexible substrate, and the second transparent electrode may be arranged in the same direction as the long and short side directions of the second flexible substrate. Alternatively, the first transparent electrode is arranged in the same direction as the short side direction of the first flexible substrate, and the second transparent electrode is arranged in the same direction as the short side direction of the second flexible substrate. Is also good. In addition, a liquid crystal alignment film process is performed on the first flexible substrate on which the first transparent electrode is formed and the second flexible substrate on which the second transparent electrode is formed by a printing method. The step of spraying a spacer on the region where the transparent electrode is formed may be used in appropriate combination. Further, a pressure bonding step for keeping the cell gap constant while applying pressure may be included.

A step of applying a seal member on at least one of the first flexible substrate and the second flexible substrate, and a step of curing the seal member; Is further included. And it is preferable that the said sealing member is a photocurable adhesive. Further, in order to cure the seal member, it is preferable to use light having a wavelength of 380 nm to 450 nm.

By adopting the above configuration, the sealing material hardening step by heat is not required, so that the liquid crystal element can be prevented from warping due to thermal expansion or thermal contraction of the flexible substrate.
Since the sealing member is cured at a wavelength of 380 nm to 450 nm, discoloration and deterioration of the flexible substrate due to ultraviolet rays can be prevented.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

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

First, an electrode group 2 is placed on a flexible substrate 1 (for example, Amorix film AM7015C manufactured by Fujimori Kogyo KK).
And the stripe direction of the electrode group 5 on the flexible substrate 4 is parallel to the short side direction 10 of the flexible substrate 4. (FIG. 1 and FIG. 3A). Next, an alignment film 20 (for example, STX-24 manufactured by Hitachi Chemical Co., Ltd.) is printed at a thickness of about 500 ° by a printing method, baked at 130 ° C. for 2 hours, and subjected to an alignment treatment by rubbing (FIG. b)).

Next, a 6.5 μm spacer 21 (for example, AW manufactured by Catalyst Kasei Co., Ltd.) which keeps a fixed interval on the flexible substrate 1 is used.
-II) by an electrostatic spraying method, and sealant 22 (for example, TB-302 manufactured by Three Bond Co., Ltd.) is applied to flexible substrate 4.
5) is applied by a dispenser application method (FIG. 3)
(C)).

Next, the flexible substrate 1 is bonded so that the long side direction 7 of the flexible substrate 1 and the short side direction 10 of the flexible substrate 4 are perpendicular to each other (FIGS. 2 and 3D). Next, a high-pressure mercury lamp 24 (for example, OHD-320M manufactured by Oak Manufacturing Co., Ltd.) is irradiated through a filter 23 (for example, a band-pass filter manufactured by Oak Manufacturing Co., Ltd.) that cuts light of less than 380 nm by applying pressure to a predetermined cell gap. The sealing material is cured by irradiating light having a wavelength of 380 nm or more with a device (HSL-300 lamp) (FIG. 3 (e)).

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

The completed liquid crystal element was a liquid crystal element having no warpage due to the shrinkage of the flexible substrate due to heat and no deterioration in display quality due to the deterioration of the flexible 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 element. Yes, FIG. 4
FIG. 5 is a schematic view after forming the electrode group, FIG. 5 is a schematic view before and after a bonding step, and FIG. 11 is a schematic perspective view of a completed liquid crystal element. This will be described with reference to FIGS. 3, 4, 5, and 11.

First, on the flexible substrate 1 (for example, a transparent conductive film FST-534X manufactured by Sumitomo Bakelite Co., Ltd.), the stripe direction of the electrode group 2 is set to the long side direction 7 of the flexible substrate 1.
And the direction of the stripes of the second electrode group 5 on the flexible substrate 4
Are formed by photoetching so as to be parallel to (FIG. 3A and FIG. 4).

Next, an alignment film 20 (for example, CRD-8451 manufactured by Sumitomo Bakelite Co., Ltd.) is printed at a thickness of about 500 ° by a printing method, baked at 150 ° C. for 2 hours, and subjected to an alignment treatment by rubbing (FIG. 3 (b)).

The prepared liquid crystal element has no warpage due to the influence of heat shrinkage of the flexible substrate, has no deterioration in display quality due to deterioration of the flexible substrate due to ultraviolet rays, and has the same display characteristics. It was cheaper than.

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

The prepared liquid crystal element has no warpage due to the thermal shrinkage of the flexible substrate, no deterioration in display quality due to deterioration of the flexible substrate due to ultraviolet rays, and the same display characteristics. It was cheaper than. [Brief Description of the Drawings] Next, 6.5 μm spacers 21 (for example, AW-II manufactured by Catalyst Kasei Co., Ltd.) that keep a constant interval on the flexible substrate 1 are sprayed by an electrostatic spraying method, and the flexibility is increased. A sealing material 22 (for example, TB-3025 manufactured by Three Bond) is applied to the substrate 4 by a dispenser application method (FIG. 3C). Next, the flexible substrate 1 and the flexible substrate 4 are bonded so that the long side direction 7 and the long side direction 9 of the flexible substrate 4 are perpendicular to each other (FIGS. 3D and 5).
Next, a high-pressure mercury lamp 24 (for example, OHD-320M manufactured by Oak Manufacturing Co., Ltd.) is irradiated through a filter 23 (for example, a band-pass filter manufactured by Oak Manufacturing Co., Ltd.) that cuts light of less than 380 nm by applying pressure to a predetermined cell gap. The seal material is cured by irradiating light having a wavelength of 380 nm or more by a machine and an HSL-300 lamp (FIG. 3).
(E)). Next, liquid crystal was injected to complete a liquid crystal element (FIG. 3 (f) and FIG. 11). The completed liquid crystal element has no warpage due to the influence of shrinkage of the flexible substrate due to heat, and
It was a liquid crystal element in which display quality did not deteriorate due to deterioration of the flexible substrate due to ultraviolet rays. (Embodiment 3) FIGS. 3, 6, 7 and 12 illustrate a first embodiment of the present invention. FIG. 3 is a schematic view of each manufacturing process of a liquid crystal element. 6 is a schematic view after the formation of the electrode group, 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 element.
This will be described with reference to FIGS. 3, 6, 7 and 12. First, on the first flexible substrate 1 (for example, Amorix film AM7015C manufactured by Fujimori Kogyo Co., Ltd.), the stripe direction of the electrode group 2 is parallel to the short side direction 8 of the flexible substrate 1, and The stripes of the electrode group 5 are formed on the flexible substrate 4 by photoetching so that the direction of the stripes is parallel to the long side direction 9 of the flexible substrate 4 (FIGS. 3A and 6). Next, the alignment film 20 (for example, S
TX-24-9) is printed at a thickness of about 500 ° by a printing method, baked at 120 ° C. for 2 hours, and subjected to an alignment treatment by rubbing (FIG. 3B). Next, 6.5 μm spacers 21 (for example, AW-II manufactured by Catalyst Kasei Co., Ltd.) that keep a constant interval on the flexible substrate 1 are sprayed by an electrostatic spraying method, and the sealing material 22 ( For example, TB-
3025) is applied by a dispenser application method (FIG. 3C). Next, the flexible substrate 1 is bonded so that the long side direction 7 and the short side direction 10 of the flexible substrate 4 are perpendicular to each other (FIGS. 3D and 7). Next, a high-pressure mercury lamp 24 (for example, OHD-320M manufactured by Oak Manufacturing Co., Ltd.) is irradiated through a filter 23 (for example, a band-pass filter manufactured by Oak Manufacturing Co., Ltd.) that cuts light of less than 380 nm by applying pressure to a predetermined cell gap. The sealing material is cured by irradiating light having a wavelength of 380 nm or more with a device (HSL-300 lamp) (FIG. 3E). Next, liquid crystal was injected to complete a liquid crystal element. (FIG. 3 (f)) The completed liquid crystal element was a liquid crystal element having no warpage due to the influence of shrinkage of the flexible substrate due to heat and no deterioration in display quality due to deterioration of the flexible substrate due to ultraviolet rays. . (Embodiment 4) FIGS. 3, 8, 9 and 13 illustrate a fourth embodiment of the present invention. FIG. 3 is a schematic view of each manufacturing process of a liquid crystal element. 8 is a schematic view after the formation of 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 element.
This will be described with reference to FIGS. 3, 8, 9, and 13. First, on the flexible substrate 1 (for example, a transparent conductive film FST-534X manufactured by Sumitomo Bakelite Co., Ltd.), the stripe direction of the electrode group 2 is parallel to the short side direction 8 of the flexible substrate 1, and Then, the electrode group 5 is formed on the flexible substrate 4 by photoetching so that the direction of the stripe of the electrode group 5 is parallel to the short side direction 10 of the flexible substrate 4 (FIGS. 3A and 8). Next, an alignment film 20 (for example, CRD-8452 manufactured by Sumitomo Bakelite Co., Ltd.) is printed at a thickness of about 500 ° by a printing method, baked at 150 ° C. for 2 hours, and subjected to an alignment treatment by rubbing (FIG. 3B )). Next, a 6.5 μm spacer 21 (for example, to keep a certain distance on the flexible substrate 1 (for example,
Catalyst AW-II) was sprayed by an electrostatic spraying method,
A sealing material 22 (for example, TB-3025 manufactured by Three Bond Co.) is applied to the flexible substrate 4 by a dispenser application method (FIG. 3C). Next, the long side direction 7 of the flexible substrate 1
And the long side direction 9 of the flexible substrate 4 is bonded so as to be perpendicular (FIGS. 3D and 9). Next, a high-pressure mercury lamp 24 (for example, OHD-320M manufactured by Oak Manufacturing Co., Ltd.) is irradiated through a filter 23 (for example, a band-pass filter manufactured by Oak Manufacturing Co., Ltd.) that cuts light of less than 380 nm by applying pressure to a predetermined cell gap. Machine and HSL-30
A light having a wavelength of 380 nm or more is irradiated by a zero lamp) to cure the sealing material (FIG. 3E). Next, liquid crystal was injected to complete a liquid crystal element (FIG. 3 (f) and FIG. 13).
The completed liquid crystal element was a liquid crystal element having no warpage due to the influence of heat shrinkage of the flexible substrate and no deterioration in display quality due to deterioration of the flexible substrate due to ultraviolet rays. Example 5 A liquid crystal element was manufactured using the method for manufacturing a liquid crystal element of Example 1. The prepared liquid crystal element has no warpage due to the thermal shrinkage of the flexible substrate, has no deterioration in display quality due to deterioration of the flexible substrate due to ultraviolet rays, has the same display characteristics, and is less expensive than the conventional one. Met. (Embodiment 6) A liquid crystal element was manufactured using the method for manufacturing a liquid crystal element of Embodiment 2. The prepared liquid crystal element has no warpage due to the thermal shrinkage of the flexible substrate, has no deterioration in display quality due to deterioration of the flexible substrate due to ultraviolet rays, has the same display characteristics, and is less expensive than the conventional one. Met. (Embodiment 7) A liquid crystal element was manufactured using the method for manufacturing a liquid crystal element of Embodiment 3. The fabricated liquid crystal element has no warpage due to the thermal shrinkage of the flexible substrate, has no deterioration in display quality due to deterioration of the flexible substrate due to ultraviolet rays, has the same display characteristics, and is less expensive than the conventional one. Met. (Embodiment 8) A liquid crystal element was manufactured using the method for manufacturing a liquid crystal element of Embodiment 4. The fabricated liquid crystal element has no warpage due to the thermal shrinkage of the flexible substrate, has no deterioration in display quality due to deterioration of the flexible 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 view after forming a group of electrodes on a flexible substrate in a first embodiment.

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 element using a flexible substrate.

FIG. 4 is a schematic view after forming a group of electrodes on a flexible substrate in a second embodiment.

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 group of electrodes on a flexible substrate in a third embodiment.

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 group of electrodes on a flexible substrate in a fourth embodiment.

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 element in Example 1.

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

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

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

[Explanation of symbols]

 1. Flexible substrate 2. 2. Striped electrode group (transparent electrode) Substrate 4. Flexible substrate 5. 5. Striped electrode group (transparent electrode) Substrate 7. 7. Long side direction of flexible substrate 8. Short side direction of flexible substrate 9. Long side direction of flexible substrate 19. Short side direction of flexible substrate Liquid crystal alignment film 22. Light curable adhesive

Claims (8)

[Claims] 1. A liquid crystal display device in which a first transparent electrode disposed on a first flexible substrate and a second transparent electrode disposed on a second flexible substrate are disposed so as to face each other. Wherein the first transparent electrode and the second transparent electrode are substantially orthogonal to each other. 2. The liquid crystal display device according to claim 1, wherein the first transparent electrode is arranged in the same direction as a short side direction of the first flexible substrate, and The liquid crystal display element, wherein the transparent electrode is arranged in the same direction as the short side direction of the second flexible substrate. 3. The liquid crystal display device according to claim 1, wherein said first transparent electrode is disposed in the same direction as a long side direction of said first flexible substrate, and The liquid crystal display element, wherein the transparent electrode is arranged in the same direction as the long side direction of the second flexible substrate. 4. The liquid crystal display device according to claim 1, wherein the first transparent electrode is arranged in the same direction as a short side direction of the first flexible substrate, and The liquid crystal display element, wherein the transparent electrode is arranged in the same direction as the short side direction of the second flexible substrate. 5. A first flexible substrate on which a first transparent electrode is disposed, and a second transparent electrode on which a second transparent electrode is disposed, wherein said first transparent electrode and said second transparent electrode are disposed. A method for manufacturing a liquid crystal display device, comprising a step of bonding the transparent electrodes so as to be substantially orthogonal to each other. 6. The method for manufacturing a liquid crystal element according to claim 5, wherein a sealing member is applied on at least one of the first flexible substrate and the second flexible substrate. A method for manufacturing a liquid crystal element, further comprising: a step of curing the seal member. 7. The method for manufacturing a liquid crystal display device according to claim 6, wherein said seal member is a photo-curable adhesive. 8. The method for manufacturing a liquid crystal element according to claim 7, wherein the sealing member is hardened to 380 nm or more.
A method for manufacturing a liquid crystal display element, wherein light having a wavelength of 50 nm or less is used.