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Liquid crystal display device

A liquid crystal display device and liquid crystal layer technology, applied in liquid crystal materials, optics, instruments, etc., can solve problems such as contrast reduction, achieve the effect of improving adhesion strength, preventing image retention and spots

Inactive Publication Date: 2017-08-29
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the alignment process is not uniform, it will cause a drop in contrast in the liquid crystal display device

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1～5

[0302] (Synthesis Examples 1 to 5 and Comparative Synthesis Example 1)

[0303] For the reactive polysiloxane, a copolymer in which the first side chain, the second side chain, and the third side chain are bonded is prepared. As the reactive polysiloxane, in the following formula (1), a compound in which X is 2-(3,4-epoxycyclohexyl)ethyl and Y is methoxy is used.

[0304] [chemical 18]

[0305]

[0306] As the above-mentioned first side chain, a functional group represented by the following formula (33) including a photofunctional group was used. As the above-mentioned second side chain, a functional group represented by the following formula (34) including a photofunctional group was used. As the above-mentioned third side chain, a functional group shown in the following formula (H-1-1) including a carboxyl group (—COOH) was used.

[0307] [chemical 19]

[0308]

[0309] [chemical 20]

[0310]

[0311] [chem 21]

[0312]

[0313] The introduction amount of t...

Embodiment 1～5 and comparative example 1

[0318] Using the liquid crystal alignment agents of Synthesis Examples 1 to 5 and Comparative Synthesis Example 1, the liquid crystal panels of Examples 1 to 5 and Comparative Example 1 were prepared according to the following procedures (1) to (6).

[0319] (1) While preparing a glass substrate (TFT substrate) with a TFT element and a transparent electrode made of Indium Tin Oxide (ITO), prepare a black matrix, a color filter, a spacer, and a glass substrate made of ITO The glass substrate (color filter substrate) of the transparent electrode.

[0320] (2) A liquid crystal alignment agent is applied to the surfaces of the cleaned two substrates on the transparent electrode side by an inkjet method. Next, provisional drying was performed at 80° C. for 2 minutes. Next, firing was performed at 230° C. for 40 minutes in a nitrogen atmosphere to produce a film having a film thickness of 100 nm.

[0321] (3) For the surface of each substrate, as an alignment treatment, 20mJ / cm 2 U...

Synthetic example 6～10

[0334] (Synthesis Examples 6-10 and Comparative Synthesis Example 2)

[0335] As a 3rd side chain, except having used the functional group shown by the following formula (H-2-1) containing two carboxyl groups, it prepared similarly to synthesis examples 1-5 and comparative synthesis example 1, and prepared a liquid crystal aligning agent. The introduction amount of the third side chain in Synthesis Examples 6 to 10 and Comparative Synthesis Example 2 was 0 mol% with respect to the silicon atoms contained in the siloxane main chain (reactive polysiloxane) (Comparative Synthesis Example 2), 10 mol% (Comparative Synthesis Example 6), 20 mol% (Synthesis Example 7), 30 mol% (Synthesis Example 8), 40 mol% (Synthesis Example 9) or 50 mol% (Synthesis Example 10).

[0336] [chem 22]

[0337]

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Abstract

The present invention provides a liquid crystal display device whereby a good voltage holding ratio is maintained for a long time using an optical alignment film, and the occurrence of ghosting and spots in a display screen image is prevented. This liquid crystal display device is provided with: a liquid crystal layer containing liquid crystal molecules and an antioxidant; a sealing material obtained by curing a sealing resin containing a compound having at least one type of first connective functional group selected from the group consisting of an epoxy group, a methoxysilane group, and an ethoxysilane group; and an optical alignment film having at least one type of alignment film polymer having an ester group; the at least one type of alignment film polymer including an optical alignment film polymer having at least one type of photofunctional group selected from the group consisting of a cinnamate group, a carbonyl group, an azobenzene group, a coumarin group, a stilbene group, and a phenol ester group, and at least one type of second connective functional group selected from the group consisting of -COOH, -NH2, -NHR, -SH, and -OH being present on the surface of the optical alignment film.

Description

technical field [0001] The present invention relates to a liquid crystal display device. More specifically, it relates to a liquid crystal display device in which alignment of liquid crystal molecules is controlled by an alignment film. Background technique [0002] A liquid crystal display device is a display device that uses a liquid crystal composition for display. A typical display method is to irradiate light from a backlight to a liquid crystal panel in which a liquid crystal composition is sealed between a pair of substrates, and illuminate the liquid crystal composition. A voltage is applied to change the alignment of the liquid crystal molecules, thereby controlling the amount of light transmitted through the liquid crystal panel. Such liquid crystal display devices are used in electronic devices such as smartphones, tablet PCs, and car navigation systems due to their advantages of thinness, light weight, and low power consumption. [0003] In a liquid crystal dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337G02F1/13G02F1/1339
CPCG02F1/1339G02F1/133711C09K19/56G02F1/133719G02F1/133788G02F1/133397G02F1/13712C09K19/54G02F1/137
Inventor 水崎真伸寺冈优子
Owner SHARP KK
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