JPH11149080A - Manufacturing method of liquid crystal display device - Google Patents

Abstract

(57) [Problem] To provide a method of manufacturing a liquid crystal display device capable of improving display defects of a liquid crystal display panel due to non-uniform liquid crystal alignment and realizing a liquid crystal display device with good display quality. SOLUTION: When forming an organic polymer alignment film on a glass substrate 1 with a transparent electrode, the formation area is extended to an unnecessary area outside the sealant, and after performing alignment processing with a rubbing cloth, the alignment processing unevenness is caused. The organic polymer alignment film 3 in an unnecessary region including a part thereof is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a liquid crystal display having an organic polymer alignment film on a glass substrate provided with a transparent electrode.

[0002]

2. Description of the Related Art FIG. 5 is an external plan view of a liquid crystal display panel used in a conventional liquid crystal display device, and FIG. 6 is a cross-sectional view taken along the line AA shown in FIG. 5 and 6, 4a and 4b are glass substrates, 5a and 5b are transparent electrodes,
Reference numerals 6a and 6b denote drive circuit connecting portion transparent electrodes, 7a and 7b are organic polymer alignment films, 8 is a sealant, 9 is a liquid crystal, and 10 is a spacer.

When manufacturing a liquid crystal display device using such a liquid crystal display panel, the liquid crystal display panel is manufactured through a series of steps as follows. That is, the transparent electrodes 5a, 5b are first placed on the pair of glass substrates 4a, 4b, respectively.
Is formed as necessary, and the organic polymer alignment films 7a and 7b are formed by heat treatment. After the obtained organic polymer alignment films 7a and 7b are subjected to alignment treatment by rubbing with a rubbing cloth, the glass substrates 4a and 4b
Are arranged facing each other with a spacer 10 interposed therebetween, a sealant 8 is arranged in a peripheral portion therebetween, and a liquid crystal 9 is filled between the glass substrates 4a and 4b, whereby a liquid crystal display panel is manufactured.

A liquid crystal display device is manufactured using the liquid crystal display panel manufactured as described above. In the liquid crystal display panel manufactured in the manufacturing process of the liquid crystal display device, the organic polymer alignment films 7a and 7b are provided in the sealant 8 in order to maintain reliability against humidity and maintain the adhesive strength of the sealant 8. It must be formed only in the area.

Therefore, conventionally, the organic polymer alignment film 7
As a method for forming a and 7b, a method of applying a solution such as polyimide or polyvinyl alcohol or a precursor thereof only in the region by a printing method, and then performing an orientation treatment with a rubbing cloth, or a photosensitive polyimide solution or After applying the entire surface of the precursor with a spinner or the like,
Unnecessary portions outside the region are masked, ultraviolet rays are radiated only in the region, the unnecessary portion is removed by wet development treatment, heat treatment is performed, and orientation treatment is performed with a rubbing cloth.

[0006]

However, in the above-mentioned conventional method for manufacturing a liquid crystal display device, a solution of polyimide or polyvinyl alcohol or a precursor thereof is used as the method for forming the organic polymer alignment films 7a and 7b. After the rubbing cloth rubs the edge portions of the organic polymer alignment films 7a and 7b, the alignment process in the vicinity of the edge portions is affected by a step due to the film thickness. Since it cannot be made uniform with other portions, the liquid crystal alignment becomes non-uniform, and when the edge portion is close to the liquid crystal display portion, the liquid crystal display panel has a problem that the display becomes defective.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and improves a display defect of a liquid crystal display panel due to non-uniform liquid crystal alignment, thereby realizing a liquid crystal display device with good display quality. An apparatus manufacturing method is provided.

[0008]

According to the present invention, there is provided a method of manufacturing a liquid crystal display device, comprising the steps of: forming an organic polymer on a glass substrate provided with a transparent electrode; After forming an alignment film and performing an alignment treatment using a rubbing cloth, an unnecessary portion of the organic polymer alignment film including an uneven portion of the alignment treatment is removed, and another alignment treatment near an edge portion of the organic polymer alignment film is performed. The uniformity of the liquid crystal display panel is characterized by maintaining the reliability with respect to humidity and the adhesive strength of the sealant, and uniforming the liquid crystal orientation of the liquid crystal display panel.

As described above, it is possible to improve the display failure of the liquid crystal display panel due to the non-uniform liquid crystal alignment, and to realize a liquid crystal display device having good display quality.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a liquid crystal display device according to the first aspect of the present invention includes a liquid crystal display panel manufactured by filling a liquid crystal between a pair of glass substrates with transparent electrodes opposed to each other. In the method for manufacturing a liquid crystal display device, when forming an organic polymer alignment film on the glass substrate with a transparent electrode, at least one or more of the formation regions does not require the organic polymer alignment film outside a sealant. A method of manufacturing the liquid crystal display panel by spreading the organic polymer alignment film over a region, performing an alignment treatment using a rubbing cloth, and removing the organic polymer alignment film in the unnecessary region.

According to this method, the organic polymer alignment film in the unnecessary region is removed after the alignment treatment, and the alignment treatment in the vicinity of the edge of the organic polymer alignment film is made uniform with other portions, so that the reliability with respect to humidity can be reduced. In addition to maintaining the properties and the adhesive strength of the sealant, the liquid crystal alignment of the liquid crystal display panel is made uniform.

According to a second aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device having a liquid crystal display panel formed by filling a liquid crystal between a pair of glass substrates with transparent electrodes opposed to each other. When forming an organic polymer alignment film on the glass substrate with a transparent electrode, the formation region is defined as the entire surface including the unnecessary region of the organic polymer alignment film on the glass substrate with a transparent electrode, After forming an alignment film and performing an alignment treatment with a rubbing cloth, the organic polymer alignment film in the unnecessary region is removed to manufacture the liquid crystal display panel.

According to this method, the organic polymer alignment film is formed on the entire surface of the glass substrate with a transparent electrode, and the alignment treatment is made uniform to maintain the reliability against humidity and the adhesive strength of the sealant. At the same time, the liquid crystal alignment of the liquid crystal display panel is made uniform.

Hereinafter, a method for manufacturing a liquid crystal display device according to an embodiment of the present invention will be specifically described with reference to the drawings. (Embodiment 1) FIG. 1 is an external plan view of a glass substrate with a transparent electrode for explaining a method of manufacturing a liquid crystal display device of Embodiment 1 and FIG. 2 is a liquid crystal display device of Embodiment 1. FIG. 3 is a right side view of the glass substrate provided with a transparent electrode.
1 and 2, reference numeral 1 denotes a patterned glass substrate with a transparent electrode, 2 denotes an organic polymer alignment film in a region inside the sealant, and 3 denotes an organic polymer alignment film in an unnecessary region outside the sealant. .

In the manufacturing process according to the first embodiment, first, as shown in FIG. 1, a polyimide solution is printed on a patterned glass substrate 1 with a transparent electrode by a printing method to form a region inside the sealing agent. After applying simultaneously to the unnecessary area 3 outside the sealant which is expanded by 10 mm from the area including the area 2 and heating at 200 ° C. for 1 hour to form an organic polymer oriented film having a thickness of 500 °, An orientation treatment is performed with a rubbing cloth.

Thereafter, the organic polymer alignment film 3 in an unnecessary area outside the sealant is wiped off with a clean cloth impregnated with acetone, and the organic polymer alignment film 3 is further opposed to each other via a spacer and bonded with the sealant. Is filled to prepare a liquid crystal display panel, and a liquid crystal display device is manufactured using the liquid crystal display panel.

As described above, after the alignment treatment, the organic polymer alignment film in the unnecessary area including the non-uniformity of the alignment treatment is removed, so that the reliability against humidity and the adhesive strength of the sealant are maintained, and the liquid crystal is maintained. A liquid crystal display device including a liquid crystal display panel having uniform display and good display quality can be obtained. (Embodiment 2) FIG. 3 is an external plan view of a glass substrate with a transparent electrode for explaining a method of manufacturing a liquid crystal display device of Embodiment 2 and FIG. 4 is a liquid crystal display device of Embodiment 2. FIG. 3 is a right side view of the glass substrate provided with a transparent electrode.
3 and 4, reference numeral 1 denotes a patterned glass substrate with a transparent electrode, reference numeral 2 denotes an organic polymer alignment film in a region inside the sealant, and reference numeral 3 denotes an organic polymer alignment film in an unnecessary region outside the sealant. .

In the manufacturing process according to the second embodiment, first, as shown in FIG. 3, a polyimide solution is applied on the entire surface of a patterned glass substrate 1 with a spinner by a spinner, To form an organic polymer alignment film having a thickness of 500 °, and then performing an alignment treatment with a rubbing cloth.

After that, the organic polymer alignment film 3 in an unnecessary area outside the sealant is wiped off with a clean cloth impregnated with acetone, and the organic polymer alignment film 3 is further opposed to each other via a spacer and bonded with the sealant. Is filled to prepare a liquid crystal display panel, and a liquid crystal display device is manufactured using the liquid crystal display panel.

In the case where the organic polymer alignment film is formed on the entire surface of the glass substrate with a transparent electrode as described above, there is no edge portion of the alignment film formation pattern on the glass substrate with a transparent electrode. A liquid crystal display device including a liquid crystal display panel with good display quality and uniform liquid crystal alignment can be obtained without being affected by steps. In addition, since the organic polymer alignment film in the unnecessary area is removed, the reliability against humidity and the adhesive strength of the sealant can be maintained.

[0021]

As described above, according to the first aspect of the present invention,
Remove the organic polymer alignment film in the unnecessary area after the alignment treatment,
By making the alignment treatment near the edge of the organic polymer alignment film uniform with other parts, it is possible to maintain the reliability against humidity and the adhesive strength of the sealant, and to make the liquid crystal alignment of the liquid crystal display panel uniform. it can.

According to the second aspect of the present invention, the formation area of the organic polymer alignment film is set as the entire surface on the glass substrate with the transparent electrode, and the alignment treatment is made uniform over the entire surface. And the liquid crystal alignment of the liquid crystal display panel can be made uniform.

As described above, it is possible to improve the display failure of the liquid crystal display panel due to the non-uniform liquid crystal orientation, and to realize a liquid crystal display device with good display quality.

[Brief description of the drawings]

FIG. 1 is an external plan view of a glass substrate with a transparent electrode for describing a method of manufacturing a liquid crystal display device according to Embodiment 1 of the present invention.

FIG. 2 is a right side view of the glass substrate with a transparent electrode according to the first embodiment.

FIG. 3 is an external plan view of a glass substrate with a transparent electrode for describing a method of manufacturing a liquid crystal display device according to Embodiment 2 of the present invention.

FIG. 4 is a right side view of the glass substrate with a transparent electrode according to the second embodiment.

FIG. 5 is an external plan view of a liquid crystal display panel in a conventional liquid crystal display device.

FIG. 6 is a sectional view taken along the line AA in FIG. 5;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 glass substrate 2 organic polymer alignment film in region inside sealant 3 organic polymer alignment film in unnecessary region outside sealant 4a, 4b glass substrate 5a, 5b transparent electrode 6a, 6b drive circuit connection portion transparent electrode 7a, 7b Organic polymer alignment film 8 Sealant 9 Liquid crystal 10 Spacer

Claims (2)

[Claims] 1. A method for manufacturing a liquid crystal display device having a liquid crystal display panel produced by filling a liquid crystal between a pair of glass substrates with transparent electrodes opposed to each other, wherein an organic polymer is provided on the glass substrate with transparent electrodes. When forming an alignment film,
Expanding at least one or more of the formation regions to unnecessary regions of the organic polymer alignment film outside the sealant,
A method for manufacturing a liquid crystal display device, comprising: forming the organic polymer alignment film, performing an alignment treatment with a rubbing cloth, and removing the organic polymer alignment film in the unnecessary region to manufacture the liquid crystal display panel. . 2. A method for manufacturing a liquid crystal display device having a liquid crystal display panel manufactured by filling a liquid crystal between a pair of glass substrates with transparent electrodes opposed to each other, wherein an organic polymer is provided on the glass substrate with transparent electrodes. When forming an alignment film,
After forming the organic polymer alignment film on the entire surface including the unnecessary region of the organic polymer alignment film on the glass substrate with the transparent electrode, and performing an alignment treatment using a rubbing cloth, the organic high layer of the unnecessary region is formed. A method for manufacturing a liquid crystal display device, wherein the liquid crystal display panel is manufactured by removing a molecular alignment film.