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Liquid crystal film material, liquid crystal alignment agent, liquid crystal alignment film, preparation method of liquid crystal alignment film and liquid crystal display element

A liquid crystal alignment film and liquid crystal alignment agent technology, applied in liquid crystal materials, chemical instruments and methods, optics, etc., can solve the problems of reduced brightness, interference with grayscale display, and reduced quality of liquid crystal display, achieving high contrast and suppressing display contrast Good effect of drop and afterimage

Active Publication Date: 2021-03-09
深圳清荷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the ion density is high, the voltage applied to the liquid crystal decreases, resulting in a decrease in brightness, which sometimes interferes with normal grayscale display
In addition, even if the initial ion density is low, there are cases where the ion density increases after the high-temperature accelerated test
The long-term reliability reduction associated with residual charges and ionic impurities, and the generation of afterimages will reduce the display quality of liquid crystals.

Method used

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  • Liquid crystal film material, liquid crystal alignment agent, liquid crystal alignment film, preparation method of liquid crystal alignment film and liquid crystal display element
  • Liquid crystal film material, liquid crystal alignment agent, liquid crystal alignment film, preparation method of liquid crystal alignment film and liquid crystal display element
  • Liquid crystal film material, liquid crystal alignment agent, liquid crystal alignment film, preparation method of liquid crystal alignment film and liquid crystal display element

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example

[0118] b-1-1. Synthetic route

[0119]

[0120] Synthesis of compound b-1-1a

[0121] Get compound 4-amino 2-methyl ether base iodobenzene 16.57 (25mmol), compound 4-dihydroxyboryl aniline (37.3mmol, NaI3.75g (25mmol.), NaI 2 CO 3 5.3g (50mmol), PivOH1.91g (18.75mmol), CsOH·H 2 O20.99g (125mmol), CHCl 3 17.7g (75mmol), ethylene glycol (200mL) was added to a 500ml flask, heated to 120°C in an oil bath, and reacted for 24h. Detected by TLC, after the reaction was complete, cooled to room temperature, extracted with EA, washed with saturated brine, dried with anhydrous sodium sulfate, and the solvent was removed by rotary evaporation. [M+1]=257.30PE / The product b-1-1a was obtained by EA column chromatography with a yield of 80%.

[0122] Synthesis of compound b-1-1b

[0123] Take 5.68g (20mmol) of compound b-1-1a, 0.92g (20mmol) of methylhydrazine, ethanol (200ml), and acetic acid (60ml) into a 500ml round-bottomed flask, heat to reflux in an oil bath, and detect with T...

Synthetic example A-1-1

[0151] Under a nitrogen atmosphere, drop 1-(4-(4-heptylcyclohexyl)phenoxy)-2,4-diaminobenzene (53.2g, 140mmol) into a 500mL three-necked round-bottomed flask (the following Abbreviated as b-2-8), p-phenylenediamine (2.16g, 20 mmol) (hereinafter referred to as b-2-1), p-aminodiphenylethane (4.23g, 20 mmol) (hereinafter referred to as b-2 -3) and 96.12 g of NMP, the resulting suspension was stirred until a yellow solution was obtained. Then 38.54g (180 mmol) of 2,3,5-tricarboxycyclopentylacetic dianhydride (hereinafter abbreviated as a-2) plus 0.40 g (4 mmol) of n-hexylamine as a molecular weight regulator and 96.12 g of NMP were added to the system. The reaction was exothermic and stirred at room temperature for 4 hours to obtain polyamic acid polymer A-1-1 with a solid content of 20% dissolved in NMP. As a result of confirming the molecular weight of polymer A-1-1 by GPC, the number average molecular weight (Mn) was 8250 g / mol. .

[0152] Synthesis Examples A-1-2 to A-1-20 ...

Embodiment 1

[0188] The liquid crystal aligning agent of Example 1 was coated on a piece of the first glass substrate with ITO electrodes by printing to form a pre-coat layer, and left for 10 minutes to delaminate the alignment layer and the conductive layer of the alignment film. After pre-curing (hot plate, 85°C, 10 minutes), main curing (circulation oven, 225°C, 50 minutes), exposure (254nm polarized light, 5mW / cm 2 , 1000mj / cm 2 ) will obtain the first glass substrate with the liquid crystal alignment film of embodiment 1 formed on the ITO electrode.

[0189] The liquid crystal aligning agent of Example 1 was coated on a second glass substrate without an ITO electrode by spin coating to form a pre-coat layer. The second glass substrate on which the liquid crystal aligning film of Example 1 is formed is obtained after the above-mentioned pre-curing, main curing, and light exposure.

[0190]An ultraviolet curable glue is coated on the periphery of one of the first glass substrate and t...

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Abstract

The invention discloses a liquid crystal film material, a liquid crystal alignment agent, a liquid crystal alignment film, a preparation method of the liquid crystal alignment film and a liquid crystal display element, and belongs to the technical field of liquid crystal display. The liquid crystal film material comprises a tetracarboxylic dianhydride component a and a diamine component b, whereinthe diamine component b at least comprises a strongly polar diamine compound b1 shown in the specification; the liquid crystal alignment agent comprises a conducting layer polymer and an aligning layer polymer, wherein the conducting layer polymer is selected from the liquid crystal film material, and the aligning layer polymer is selected from imidized polyimide synthesized from the tetracarboxylic dianhydride component a and a diamine compound. The liquid crystal display element prepared from the liquid crystal alignment agent has the advantage of good residual image performance, maintainshigh voltage retention rate even if exposed to light from backlight and the like for a long time, and has high contrast ratio and clear bright and dark display, so that the picture display quality ofthe liquid crystal display element is improved, the service life of a product is prolonged, and a high-quality liquid crystal display element can be manufactured.

Description

technical field [0001] The invention relates to a liquid crystal film material, a liquid crystal alignment agent, a liquid crystal alignment film, a preparation method thereof, and a liquid crystal display element, and belongs to the technical field of liquid crystal displays. Background technique [0002] As liquid crystal display elements, TN (Twisted Nematic: Twisted Nematic) mode, STN (SuperTwisted Nematic: Super Twisted Nematic) mode, IPS (In-Plane Switching: In-Plane Switching) mode, and FFS (Fringe Field Switching: Fringe Field Switching) are known. mode, vertical alignment type VA (multi-area vertical alignment) mode and other liquid crystal display elements with various driving methods. These liquid crystal display elements are used in image display devices of various electronic devices such as televisions and mobile phones, and are being developed to further improve display quality. Specifically, the improvement of the performance of the liquid crystal display ele...

Claims

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Application Information

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IPC IPC(8): C09K19/56G02F1/1337
CPCC09K19/56G02F1/133723
Inventor 李晗梁为民游石枝
Owner 深圳清荷科技有限公司
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