Vertical alignment-type liquid crystal aligning agent and vertical alignment-type liquid crystal display device

A liquid crystal aligning agent and vertical alignment technology, applied in liquid crystal materials, chemical instruments and methods, instruments, etc., can solve problems such as reliability decline and performance decline, and achieve the effect of various characteristics.

Inactive Publication Date: 2007-08-15
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the introduction of specific components, there are adverse effects of reduced reliability and performance degradation due to the dissolution of specific components into the liquid crystal layer, especially for TV applications that require a high level of reliability and afterimage problems in recent years Vertical alignment type liquid crystal display element has become an unsuitable technology

Method used

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  • Vertical alignment-type liquid crystal aligning agent and vertical alignment-type liquid crystal display device
  • Vertical alignment-type liquid crystal aligning agent and vertical alignment-type liquid crystal display device
  • Vertical alignment-type liquid crystal aligning agent and vertical alignment-type liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 58～66

[0125] The composition shown in Table 4 was added to N-methyl-2-pyrrolidone in the order of diamine and tetracarboxylic dianhydride (expressed as "acid anhydride" in the table) to prepare a solid content concentration of 20% by weight. solution, and allowed to react at 60° C. for 4 hours to obtain a polyamic acid polymer having a logarithmic viscosity shown in Table 2. After adding 5 times moles of pyridine and 3 times moles of acetic anhydride to the obtained polyamic acid polymer, the mixture was heated at 110° C. for 4 hours for a dehydration ring closure reaction. The resulting solution was reprecipitated with diethyl ether, recovered, and dried to obtain imidized polymers B1 to B9 having logarithmic viscosities and imidation ratios shown in Table 4.

[0126] Table 4

[0127] combine

[0128] Notes to Table 4: For diamine compounds and acid anhydrides, it is the same as the notes to Tables 1-3.

Embodiment 1

[0130] 2g of the polyamic acid polymer (A-1) obtained in Synthesis Example 1 was added to gamma-butyrolactone / N-methyl-2-pyrrolidone / butyl cellosolve=45 / 40 / 15 (weight ratio) to make it It was dissolved to prepare a solution having a solid content concentration of 6% by weight, and the solution was filtered with a filter having a pore diameter of 1 μm to prepare the liquid crystal aligning agent of the present invention.

[0131] The liquid crystal aligning agent was coated on a boron-doped silicon wafer with a spin coater, and dried on a hot plate at 200°C for 10 minutes to form a coating film with a dry film thickness of 0.3 μm, which was used as a substrate for volume resistivity measurement . The volume resistivity of the liquid crystal aligning film after high-temperature baking was evaluated using this board|substrate. The results are listed in Table 5.

[0132] Except for that, it carried out similarly to the above, prepared the solution of 4 weight% of solid content d...

Embodiment 2～93

[0137] Embodiment 2~93, comparative example 1~25

[0138] Except having used the polymer shown in Tables 5-8, it carried out similarly to Example 1, prepared the liquid crystal aligning agent, produced the board|substrate for volume resistivity measurement, and the liquid crystal display element, and evaluated it. The evaluation results are listed in Tables 5-8.

[0139] table 5

[0140]

Reality

apply

example

solid content

volume resistivity

(×10 12 Ω·cm)

vertically

Orientation

Residual DC

(V)

reliability test

polyamic acid

polymer

Additives

(weight%)

1

A-1

Additive A(5)

5.7

good

50

no spots

2

A-2

Additive A (30)

5.7

good

50

no spots

3

A-2

Additive B(5)

6.1

good

60

no spots

4

A-2

Additive C (10)

7.0 ...

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PUM

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Abstract

The invention provides a vertical alignment-type liquid crystal alignment agent with good vertical alignment property and afterimage property. A vertical alignment-type liquid crystal alignment agent containing polyamide acid polymer and/or polyimide polymer has a volume resistivity of the film less than 1x1013 Omega.cm after the high-temperature roasting.

Description

technical field [0001] The invention relates to a film whose volume resistivity is 1×10 after high-temperature firing 13 A vertical alignment type liquid crystal aligning agent containing a polyamic acid polymer and / or a polyimide polymer below Ω·cm. More specifically, when a voltage is applied to a vertical alignment type liquid crystal display element for a long time, it is related with the vertical alignment type liquid crystal aligning agent which has little electric charge accumulation, and is hard to accumulate static electricity. Background technique [0002] Currently, as a liquid crystal display element, a TN-type liquid crystal display element having a so-called TN-type (twisted nematic) liquid crystal cell formed on the surface of a substrate provided with a transparent conductive film is known. A liquid crystal alignment film made of imide polymer, etc., is used as a substrate for a liquid crystal display element, and two substrates are arranged opposite to each...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337C09K19/52
CPCC08G73/10C08L79/08C09K19/56G02F1/133723
Inventor 熊谷勉西川通则
Owner JSR CORPORATIOON
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