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A kind of liquid crystal aligning agent for preparing liquid crystal display element and application thereof

A technology of liquid crystal alignment agent and liquid crystal alignment film, which is applied in the direction of liquid crystal materials, instruments, chemical instruments and methods, etc., can solve problems such as inconsistent electric field strength, uneven in-plane orientation, surface scratches, etc., to speed up the dissipation speed, improve The hardness of the oriented film surface and the effect of improving the flatness of the film surface

Active Publication Date: 2022-03-22
JIANGSU SUNERA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, rubbed orientation is likely to cause various problems such as surface scratches, debris, static electricity, and uneven orientation in the plane, which cannot meet the existing needs.
As a method to replace the rubbing alignment, it is known to use polarized ultraviolet light to irradiate the surface of the liquid crystal alignment film to align the liquid crystal, which solves the problems of dust and scratches in the rubbing alignment mentioned above, IPS, FFS type liquid crystal display element THF (thin film transistor ) DC bias charges will be generated during the driving process. With the accumulation of DC bias charges on the surface, the accumulated charges cannot be dissipated quickly when switching screens, which will cause the electric field strength received by the liquid crystal to be inconsistent with the applied electric field strength, thus appearing due to DC bias charges. Afterimages caused by charge accumulation

Method used

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  • A kind of liquid crystal aligning agent for preparing liquid crystal display element and application thereof
  • A kind of liquid crystal aligning agent for preparing liquid crystal display element and application thereof
  • A kind of liquid crystal aligning agent for preparing liquid crystal display element and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0070] The preparation method of the diamine compound DA (A-1-1) represented by the structural unit A-1-1 is shown in the synthetic route 1:

[0071]

[0072] The specific operation process is:

[0073] (1) Synthesis of compound a-3

[0074] Drop into a-1 (28.34g, 110 mmol), a-2 (12.02g, 50 mmol), potassium carbonate (13.82g, 100 mmol) and DMF solvent 200mL in a 250mL three-neck round bottom flask, heat up and reflux React for 12 hours, cool down to room temperature, add the reaction solution into 1000 g of water, a large amount of light yellow solid precipitates, filter the solid, and rinse with 100 mL of water to obtain the crude compound a-3, which is recrystallized from a mixture of THF and ethanol, After filtering and drying, 25.6 light yellow solidified powder a-3 was obtained, and the yield was 75%.

[0075] (2) Synthesis of compound DA (A-1-1)

[0076] Put a-3 (20.48g, 30 mmol), 10g hydrazine hydrate (80%) and DMF solvent 200mL in a 250mL three-neck round bottom ...

Synthetic example 2～3

[0079] The diamine compounds DA (A-1-2) and DA (A-1-3) represented by "Formula A-1-2~Formula A-1-3" can be synthesized according to the synthesis route 1, and both can be used The corresponding parent compounds undergo Williamson etherification reaction, and then add hydrazine hydrate to synthesize the target diamine compounds DA (A-1-2) and DA (A-1-3). The structural formula is shown in the following formula DA (A-1-2) and DA (A-1-3), the high-resolution mass spectrometry results and elemental analysis results of the corresponding target compounds are shown in Table 1 below.

[0080]

[0081] Mass spectrum and elemental analysis data of each compound in Table 1 Synthesis Examples 2-3

[0082]

[0083]

[0084] The compound abbreviation used in the present embodiment and comparative example and the measuring method of each characteristic are as follows:

[0085] NMP: N-methyl-2-pyrrolidone

[0086] BC: Ethylene glycol monobutyl ether

[0087] DA(A-1-1):

[0088] ...

Embodiment 1

[0107] 500mL three-necked round-bottomed flask was ventilated and protected, and then the compounds DA(A-1-1) (5.61g, 10mmol), DA(A-2) (4.01g, 20mmol), DA(A -5) (2.16g, 20mmol) and NMP (81.18g), the reaction system was heated up to 80°C and kept for 0.5 hours to completely dissolve, and then DAH (B-1) (5.88g, 30mmol), DAH (B-1) were put into the system 2) (4.48g, 20mmol) and NMP (81.18g), keep the temperature at 80° C. for 6 hours, then cool down to room temperature to obtain polyamic acid polymer PA-1 with a concentration of 12%.

[0108] Dilution: Take 100 g of PA-1 polyamic acid solution, add 71.6 g of NMP and 68.4 g of BC, stir at room temperature for 2 hours, and then filter through a 0.2 μm filter membrane to obtain the liquid crystal alignment agent LCA-1 of Example 1. The polymer concentration in the liquid crystal aligning agent is 5.0%, and the solvent ratio is NMP:BC=70:30.

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Abstract

The invention discloses a liquid crystal alignment agent for preparing a liquid crystal display element and its application. The liquid crystal alignment agent includes at least one of a polyimide precursor and an imidization product of the polyimide precursor, The polyimide precursor has a structural unit as shown in Formula 1; the liquid crystal alignment film prepared by the present invention has the characteristics of high film surface hardness, excellent DC charge relaxation characteristics, and low pretilt angle.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal display, and in particular relates to a liquid crystal aligning agent, a liquid crystal aligning film and a prepared liquid crystal display element. Background technique [0002] Liquid crystal display (LCD) is the most dynamic electronic product in the field of display, because it has significant advantages such as low driving voltage, low power consumption, light weight, small size, and no harmful rays, so LCD is widely used in TVs, Various display fields such as computers and mobile phones. The working principle of the liquid crystal display is to apply an external electric field to the liquid crystal, so that the polar molecules of the liquid crystal are twisted under the action of the external electric field, changing the internal arrangement state of the liquid crystal molecules, changing the direction of the incident polarized light, and then using a polarizer to control Whether the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/56G02F1/1337
CPCC09K19/56G02F1/133723
Inventor 解万龙张程栋王忠凯王明佼任辉彩崔明
Owner JIANGSU SUNERA TECH CO LTD
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