Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element

A liquid crystal aligning agent and substituent technology, which is applied in liquid crystal materials, instruments, optics, etc., can solve the problems of incomplete restoration of liquid crystal to the initial state, light leakage contrast of liquid crystal display elements, unqualified surface display of alignment films, etc., to reduce electrostatic dust. The effect of attracting characters, reducing the electrostatic breakdown of the film surface and improving the uniformity of orientation

Inactive Publication Date: 2019-02-22
VALIANT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rubbing alignment method usually uses textile materials such as cotton cloth or rayon to rub the surface of the liquid crystal alignment film in a certain direction to endow it with liquid crystal alignment properties, but the method of rubbing alignment is prone to static electricity and dust during the process, resulting in static electricity The problem of unqualified display due to the adsorption of dust, and even the phenomenon that local static electricity accumulates and breaks down the alignment layer causes a short circuit of the liquid crystal cell. In addition, the accumulation of static electricity can also cause afterimages on the display screen; optical alignment refers to the polarization of ultraviolet light on the surface of the alignment layer. Irradiation is used to endow the liquid crystal alignment film with the ability to align liquid crystals. According to the mechanism of photo-orientation, it is mainly divided into photo-isomerization type, photo-crosslinking type and photo-decomposition type. No matter what type of photo-orientation type, there is a relative rubbing alignment treatment method of liquid crystal orientation. Insufficient problems lead to problems such as pitting, uneven orientation, black state light leakage and insufficient contrast in the prepared liquid crystal display element, so it is necessary to enhance the anchoring ability of the alignment film to the liquid crystal to make up for the problem of insufficient photo-orientation
In addition, no matter whether the liquid crystal display element with rubbing alignment treatment or photo-alignment treatment is driven by AC voltage, the charge at both ends of the electrode will accumulate, resulting in incomplete restoration of the liquid crystal to the initial state when the liquid crystal display element is off, resulting in light leakage and leakage of the liquid crystal display element. Contrast drop problem

Method used

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  • Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element
  • Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element
  • Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The synthesis of the diamine compound represented by structural formula 1-1 is shown in Synthetic Route 1:

[0049]

[0050] Synthetic route 1

[0051] The specific operation process is:

[0052] (1) Synthesis of compound 1-1-a

[0053] Put p-4-n-heptyl-2-aminoaniline (41.27g, 200mmol), triethylamine (24.29, 240mmol) and 300ml of DMAC solvent into a 1000mL three-neck round bottom flask, cool to 0-10°C Start to drop the mixed solution of p-nitrobenzoyl chloride (37.11g, 200 mmoles) and 200ml solvent DMAC in the system, after 0.5 hours the dropwise addition is completed, heat up to 60°C and keep it warm for 10 hours, then pour the reaction solution into ice In water, the precipitate was filtered out, washed with water, and the filter cake was crystallized from a mixture of dioxane / water (2:1) to obtain a light yellow solid 1-1-a. The product was tested by high-resolution mass spectrometry, M / Z=355.17 , confirmed as the target product 1-1-a.

[0054] (2) Synthesis o...

Embodiment 2～3

[0064] The compounds represented by structural formulas (1-2)-(1-3) can be synthesized according to the corresponding compound 4-n-heptyl-2-hydroxyaniline and 4-n-heptyl-2-mercaptoaniline respectively Route 1 was synthesized, and the high-resolution mass spectrometry results and elemental analysis results of the corresponding compounds are shown in Table 1 below.

[0065] Mass spectrum, elemental analysis data of each compound in Table 1 embodiment 2~3

[0066]

Embodiment 4

[0068] The synthetic method of the compound represented by structural formula (1-4) is basically the same as that of Synthetic Example 1, except that p-nitrobenzoyl chloride is replaced by 4-benzyloxybenzoyl chloride, and the hydrocarbon group is protected by benzyloxy , and then carry out deprotection by the method of catalytic hydrogenation, and the specific operation method can be synthesized according to the following synthetic route 2:

[0069]

[0070] Synthetic route 2

[0071] The specific operation process is as follows:

[0072] (1) Synthesis of compound 1-4-a

[0073] Drop into p-4-n-heptyl-2-aminoaniline (41.27g, 200 mmol), triethylamine (24.29 g, 240 mmol) and 300 ml of DMAC solvent in a three-neck round bottom flask of 1000 mL, cool to 0-10 ℃ began to drop the mixed solution of 4-benzyloxybenzoyl chloride (49.34g, 200 mmol) and 200ml solvent DMAC in the system, after 0.5 hours, the dropwise addition was completed, and the temperature was raised to 60 ℃ for i...

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Abstract

The invention belongs to the technical field of liquid crystal, and discloses a liquid crystal alignment agent, a liquid crystal alignment film comprising the same, and a liquid crystal display element. The liquid crystal alignment agent at least comprises one of polyamide acid solution and polyimide solution which are prepared by polyreaction of dianhydride compounds and diamine compounds in solvents; the diamine compounds at least include one of diamine compound group as shown as the formula I, wherein A1 is selected from one of oxygen atom, sulphur atom and NH group. The liquid crystal alignment film comprising the liquid crystal alignment agent can increase liquid crystal pretilt angle greatly, and has excellent liquid crystal alignment uniformity; the liquid crystal display element prepared from the liquid crystal alignment film has high contrast ratio and has the characteristic of quick fading of residual images caused by accumulation of direct-current charge.

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 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 and small size, and does not contain harmful rays. It is widely used in TVs, computers, portable Telephone and other display areas. The liquid crystal display element is a flat and ultra-thin display device. Its working principle is to apply an external electric field to the liquid crystal, and 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 and making the incident polarization The direction of light chang...

Claims

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Application Information

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IPC IPC(8): C09K19/56G02F1/1337C08G73/10
CPCC08G73/1085C09K19/56G02F1/133723
Inventor 解万龙李士东王明佼张鑫鑫周银波胡葆华
Owner VALIANT CO LTD
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