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Liquid crystal aligning agent, liquid crystal alignment layer and liquid crystal display device

A technology of liquid crystal alignment agent and carbon number, applied in liquid crystal materials, instruments, organic chemistry, etc., can solve the problems of brightness or contrast reduction, halftone brightness inversion, narrow viewing angle, etc., and achieve residual DC suppression and high voltage retention rate , Improve the effect of voltage retention

Inactive Publication Date: 2011-10-05
JNC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] These liquid crystal display elements have the following disadvantages: the viewing angle at which an image can be properly recognized is narrow, and when viewed from an oblique direction, a decrease in brightness or contrast occurs, and brightness inversion of halftone occurs.
[0023] This shows that above-mentioned prior art obviously still has inconvenience and defective, and demands urgently further improving

Method used

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  • Liquid crystal aligning agent, liquid crystal alignment layer and liquid crystal display device
  • Liquid crystal aligning agent, liquid crystal alignment layer and liquid crystal display device
  • Liquid crystal aligning agent, liquid crystal alignment layer and liquid crystal display device

Examples

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example

[0196] Hereinafter, the present invention will be described using examples.

[0197] First, acid anhydrides, diamines, and solvents used in Examples are shown together with compound numbers or abbreviations below. In addition, in the examples, the abbreviation L represents the unit liter of capacity. Therefore, milliliters are expressed in mL.

[0198]

[0199] Anhydride (H-1)

[0200]

[0201] Anhydride (S-1)

[0202]

[0203] Anhydride (S-6)

[0204]

[0205] Anhydride (S-48)

[0206]

[0207]

[0208] Diamine (I-1)

[0209]

[0210] Diamine (I-2)

[0211]

[0212] Diamine (2-1-1)

[0213]

[0214] Diamine (2-1-66)

[0215]

[0216] Diamine (3-7-1) (Y 5 = n-pentyl)

[0217]

[0218] Diamine (4-1-4-1) (Y 6 = n-pentyl)

[0219]

[0220]

[0221] NMP: N-methyl-2-pyrrolidone

[0222] BC: Butyl cellosolve (ethylene glycol monobutyl ether)

Synthetic example 1

[0224]

[0225] According to Japanese Patent Laid-Open No. 2006-124371, 4-(3,5-dinitrobenzyl)phenol was synthesized. After mixing 10 g of this compound with 1 g of 5% palladium activated carbon in 100 mL of dimethylformamide, a hydrogenation reaction was carried out at 40° C. (hydrogen pressure: 680 kPa). After the reaction, the temperature was cooled to room temperature, the catalyst was removed by filtration, and the solvent was distilled off under reduced pressure to obtain the target product (7.5 g in yield, 81% in yield).

[0226] Melting point; 230.4°C-233.8°C

[0227] 1 H NMR; 9.15(s, 1H), 6.98(d, 2H, J=8.35Hz), 6.72(d, 2H, J=8.52Hz), 5.66(s, 3H), 4.63(br s, 4H)

Synthetic example 2

[0229]

[0230] 6.4 g (170 mmol) of commercially available sodium borohydride was added to a 2 L three-necked flask equipped with a thermometer, a stirrer, and a dropping funnel, and then 500 mL of dehydrated tetrahydrofuran was added. The solution was cooled to 5° C. or lower, and a solution obtained by dissolving 50 g (230 mmol) of commercially available 2,6-di-tert-butylbenzoquinone in 500 mL of dehydrated tetrahydrofuran was added dropwise thereto. The reaction liquid was warmed up to room temperature, and stirred at room temperature for 8 hours. After stirring, the obtained reaction liquid was poured into 1 L of 3M hydrochloric acid, and extracted with 1 L of ethyl acetate. After washing the organic layer twice with 1 L of pure water, anhydrous magnesium sulfate was added and dried. After filtering off anhydrous magnesium sulfate, the solvent was distilled off under reduced pressure to obtain 2,6-di-tert-butylhydroquinone (yield: 46 g, yield: 91%).

[0231]47 g (204 m...

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Abstract

The invention discloses a liquid crystal aligning agent containing polyamide acids or other derivatives obtained by reaction between the diamine represented by the formula I or mixture of the diamine and other diamines and tetracarboxylic dianhydride. The liquid crystal aligning agent can be used to form liquid crystal alignment layers of liquid crystal display devices with various display driving modes. The liquid crystal display devices formed by the liquid crystal aligning agent has high voltage holding ratio and high reliability of long-term light and can suppress residual DC. In formula I, A1 is singly-bound -O-, -COO-, -CO-, -CONH- or alkylidene of 1-6 carbons, and R independently represents hydrogen or alkyl of 1-6 carbons.

Description

technical field [0001] The invention relates to a liquid crystal alignment agent mainly containing polyamic acid or its derivatives. Background technique [0002] Liquid crystal display elements are used in various liquid crystal display devices such as monitors of notebook computers and desktop computers, viewfinders of video cameras, projection displays, and more recently, televisions. Furthermore, liquid crystal display elements are also used as optoelectronic related elements such as optical print heads, optical Fourier transform elements, and light valves. The mainstream of previous liquid crystal display elements is a display element using nematic liquid crystals. As an example, there are 1) twisted nematic (Twisted Nematic, TN) type liquid crystal display elements twisted by 90 degrees, or 2) usually twisted by 180 degrees or more The Super Twisted Nematic (Super TwistedNematic, STN) type liquid crystal display element, in addition, as an element for switching the dr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/56C07C229/60C08G73/10G02F1/1337
CPCC07C219/34C08G73/1042C08G73/1075C08L79/08C09K19/56G02F1/133723
Inventor 近藤史尚藤原武藤田幸宏藤马大亮
Owner JNC CORP
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