Light control alignment polyimide liquid crystal alignment membrane as well as preparation method and application thereof

A polyimide, light-controlled orientation technology, used in optics, nonlinear optics, instruments, etc., to achieve the effect of uniform orientation of liquid crystal cells

Active Publication Date: 2019-06-14
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the liquid crystal display is usually 60 Hz, or even 120 Hz. In such frequent AC driving, it is theoretically believed that there is no residual DC electric field, but due to the existence of impurity ions inside the liquid crystal, the generation of photocurrent in the TFT device, the TFT loop The coupling between different voltage layers, etc., all lead to the existence of the DC electric field in the actual use of the liquid crystal cell

Method used

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  • Light control alignment polyimide liquid crystal alignment membrane as well as preparation method and application thereof
  • Light control alignment polyimide liquid crystal alignment membrane as well as preparation method and application thereof
  • Light control alignment polyimide liquid crystal alignment membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Add 197.1g N-methylpyrrolidone to a 1000mL three-necked flask equipped with a nitrogen inlet, water separator and thermometer, then add 11.365g (50mmol) 4APBI (2,3,5-APBI) and 12.916g (50mmol) 1 , 3-bis(4-aminophenoxy)propane (BAPE), stirred and dissolved to form a homogeneous solution; 19.32g (98.5mmol) CBDA and 50g N-methylpyrrolidone solvent were added to the above solution, and the reaction was stirred (25°C ) 4h to obtain a viscous PAA-1 polyamic acid solution with a solid content of 15wt%. Take 150g of the above solution, add 150g of NMP, 75g of BC and various additives (2,3,4-trihydroxybenzophenone as a crosslinking agent, hexamethylsilane as a surface adhesion promoter), stir for 15min, and adjust the viscosity to 56 mPa·s, press-filter to obtain a photo-alignment polyimide liquid crystal alignment liquid with a solid content of 6%, and store it in a -15°C refrigerator. Such as figure 1 As shown in a), take about 3ml of the solution, drop it on the glass subst...

Embodiment 2

[0072] Add 156.7g N-methylpyrrolidone in a 1000mL three-neck flask equipped with a nitrogen inlet, water separator and thermometer, then add 11.365g (50mmol) 4APBI and stir to dissolve to form a homogeneous solution; add 19.32g (98.5 mmol) CBDA and 50g N-methylpyrrolidone solvent, stirred and reacted (25°C) for 12h, then added 14.615g (50mmol) 1,3-bis(4-aminophenoxy)benzene (1,3, 4APB), 50g of N-methylpyrrolidone solvent, stirred and reacted (25°C) for 12h to obtain a viscous PAA-2 polyamic acid solution with a solid content of 15wt%. Take 150g of the above solution, add 150g of NMP, 75g of BC and various additives (2,3,4-trihydroxybenzophenone as a crosslinking agent, hexamethylsilane as a surface adhesion promoter), stir for 15min, and adjust the viscosity to 54 mPa·s, press-filter to obtain a photo-alignment polyimide liquid crystal alignment liquid with a solid content of 6%, and store it in a -15°C refrigerator. Such as figure 1 As shown in a), take about 3ml of the sol...

Embodiment 3

[0080] Add 229.1g N-methylpyrrolidone in a 1000mL three-neck flask equipped with nitrogen inlet, water separator and thermometer, then add 17.017g (50mmol) diamine compound (R 1 connected to the para-position, R 2 connected to the para-position) and 12.916g (50mmol) 1,3-bis(4-aminophenoxy)propane (BAPE), stirring and dissolving to form a homogeneous solution; add 19.32g (98.5mmol) CBDA and 50g N-methylpyrrolidone solvent, stirred and reacted (25° C.) for 4 hours to obtain a viscous PAA-1 polyamic acid solution with a solid content of 15 wt%. Take 150g of the above solution, add 150g of NMP, 75g of BC and various additives (2,3,4-trihydroxybenzophenone as a crosslinking agent, hexamethylsilane as a surface adhesion promoter), stir for 15min, and adjust the viscosity to 58 mPas, press-filter to obtain a photo-alignment polyimide liquid crystal alignment liquid with a solid content of 6%, and store it in a -15°C refrigerator. Such as figure 1 As shown in a), take about 3ml of th...

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Abstract

The invention discloses a light control alignment polyimide liquid crystal alignment membrane as well as a preparation method and application thereof. The preparation method of the light control alignment polyimide liquid crystal alignment membrane comprises the following steps that a polyamide acid resin solution is prepared by using organic diamine containing heteroaromatic rings, aromatic diamine and aliphatic tetracid dianhydride as raw materials; an auxiliary agent is added into the polyamide acid resin solution to form a homogeneous phase solution; after the attenuation, polyimide liquidcrystal alignment liquid is obtained; the polyimide liquid crystal alignment liquid is applied on a base plate; through precuring treatment and curing treatment, a polyimide coating membrane is obtained; linear polarized ultraviolet light is used for irradiating the polyimide coating membrane; then, through an annealing treatment machine, the light control alignment polyimide liquid crystal alignment membrane is obtained. The light control alignment polyimide alignment membrane provided by the invention can be used for preparing TFT-LCD devices; the obtained TFT-LCD devices have the characteristics of low pretilt angle (0.2 degree or below), high VHR (greater than 95 percent), low RDC (smaller than 350 mV), liquid crystal box alignment uniformity and the like; the prepared IPS mode TFT-LCD displays can be widely applied to the fields of mobile electronics, monitors, televisions and the like.

Description

technical field [0001] The invention relates to a light-controlled alignment polyimide liquid crystal alignment film, a preparation method and application thereof, and belongs to the technical field of liquid crystal display materials. Background technique [0002] Thin film transistor liquid crystal display (TFT-LCD) has been widely used in various aspects of people's work and life. TFT-LCD includes In-Plane Switching (IPS), Vertical Alignment (VA) and Twisted Nematic (TN) modes, among which IPS is attracting more and more attention and applications due to its wide viewing angle characteristics. In the IPS mode, a pair of comb electrodes are staggered in the plane to form an electric field, and a parallel electric field is formed between the electrodes, and the liquid crystal molecules move along the electric field. Polyimide (PI), as a liquid crystal alignment film, can align liquid crystals on its surface after rubbing process, and has been widely used in the traditional...

Claims

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Application Information

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IPC IPC(8): C08G73/10C08J5/18G02F1/1337C08L79/08
Inventor 杨士勇宋勇志袁莉莉王志媛贾斌
Owner INST OF CHEM CHINESE ACAD OF SCI
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