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Liquid crystal compound, liquid crystal composition, and liquid crystal display device

A liquid crystal compound and liquid crystal composition technology, applied in liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problem of weak anchoring liquid crystal molecules, affecting the display effect of liquid crystal display devices, reducing the yield rate of liquid crystal display devices, etc. question

Pending Publication Date: 2021-09-14
SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the alignment layer also has certain disadvantages
First of all, the rubbed alignment layer is easy to cause dust particles, static electricity residue, residue, brush marks and other problems during the display process of the liquid crystal display device, which reduces the yield of the liquid crystal display device; secondly, because PI has high polarity and high water absorption, so PI is volatile during storage and transportation, resulting in the problem of uneven alignment; furthermore, PI materials are expensive, and the process of forming films of PI materials on liquid crystal display panels is also relatively complicated, thereby increasing the manufacturing cost of display panels; and , since the PI solution is usually prepared by dissolving the PI material in N-methylpyrrolidone (NMP) solvent, and then using the PI solution to prepare the alignment layer, the whole process has high energy consumption, is not environmentally friendly, and is easy to cause harm to the human body. shortcoming
The self-alignment type is used to polymerize a layer of polymer with a rough surface on the substrate by using a self-alignment agent under the irradiation of UV light, which plays the role of PI insulation and alignment of liquid crystal molecules, although the self-alignment type can avoid the aforementioned However, due to the limited properties of the material of the self-alignment alignment layer, the heat resistance and aging resistance are poor, and the ability to anchor liquid crystal molecules is also weak, which affects the display effect of the liquid crystal display device. The pretilt angle formed after alignment The adjustable range is small, and the formed pretilt angle is not stable enough. These factors are the technical problems that need to be solved urgently for the current photo-alignment type.

Method used

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  • Liquid crystal compound, liquid crystal composition, and liquid crystal display device
  • Liquid crystal compound, liquid crystal composition, and liquid crystal display device
  • Liquid crystal compound, liquid crystal composition, and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0120] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

[0121] In the present invention, the preparation method is a conventional method unless otherwise specified, and the raw materials used can be obtained from open commercial channels unless otherwise specified. The percentages refer to mass percentages, and the temperature is Celsius (°C). The meaning and test conditions are as follows:

[0122] Cp means liquid crystal clearing point (℃), DSC quantitative method test;

[0123] Δn means optical anisotropy, Δn=n e -n o , where n o is the refractive index of ordinary light, n e is the refractive index of extraordinary light, the test condition is 25±2°C, 589nm, Abbe ref...

Synthetic example 1

[0166] The structural formula of the compound is shown in the following formula I-1-1,

[0167]

[0168] Its preparation route is as follows:

[0169]

[0170] The specific operation process of preparation:

[0171] Intermediate 1

[0172] Under nitrogen protection, put 0.3mol of 2-benzyloxy-5-bromophenol, 0.39mol of 5-tert-butyldimethylsilyloxypentane bromide, and 0.39mol of anhydrous potassium carbonate into a 2L three-necked flask. 0.8LDMF, heated at 120°C for 3 hours. The reaction was monitored by a TLC plate. After the reaction was completed, the temperature was lowered, water was added with ethyl acetate, the liquid was separated, extracted and washed with water, the solvent was spin-dried, and separated by column chromatography to obtain compound 1 as a yellow solid. HPLC: 93%, yield Y=85%.

[0173] Intermediate 2

[0174] Under nitrogen protection, put 0.3mol of 4-pentylcyclohexyl 2,3-difluorophenylboronic acid, 0.3mol of o-bromo-p-iodophenol, 0.9L of toluen...

Synthetic example 2

[0188] The structural formula of the compound is shown in the following formula I-1-7,

[0189]

[0190] Its preparation route is as follows:

[0191]

[0192] The specific operation process of preparation:

[0193] Intermediate 1

[0194] The synthesis method refers to the synthesis of intermediate 3 in Example 1.

[0195] Intermediate 2

[0196] The synthesis method refers to the synthesis of intermediate 3 in Example 1.

[0197] Intermediate 3

[0198] The synthesis method refers to the synthesis of intermediate 3 in Example 1.

[0199] Intermediate 4

[0200] The synthesis method refers to the synthesis of intermediate 4 in Example 1.

[0201] Intermediate 5

[0202] The synthesis method refers to the synthesis of intermediate 5 in Example 1.

[0203] Intermediate 6

[0204] The synthesis method refers to the synthesis of intermediate 6 in Example 1.

[0205] Intermediate 7

[0206] The synthesis method refers to the synthesis of intermediate 7 in Example...

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Abstract

The invention provides a compound with a self-alignment function as shown in a formula I, a negative liquid crystal composition containing the compound, and a liquid crystal display element or a liquid crystal display containing the compound and the liquid crystal composition. The compound shown in the formula I contains two hydroxyl groups, in the panel ODF manufacturing process, due to the intermolecular acting force between the hydroxyl groups and the panel surface (the glass surface and the ITO electrode surface), the compound can spontaneously stand and be arranged on panel glass or an ITO transparent electrode substrate, liquid crystal molecules close to the compound shown in the formula I are promoted to be vertically arranged, and under the irradiation of UV light, a layer of polymer with a rough surface is formed on the substrate through polymerization, so that the effects of PI insulation and vertical alignment of liquid crystal molecules are achieved. The compound shown in the formula I has high solubility and good ultraviolet resistance, the formed pretilt angle is wide in adjustable range, image residue can be effectively improved, the PI process is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display. More specifically, it relates to a liquid crystal compound, a liquid crystal medium containing the liquid crystal compound, a liquid crystal composition, and a liquid crystal display device. Background technique [0002] With the development of display technology, liquid crystal display devices (Liquid Crystal Display, LCD) and other flat display devices are widely used in mobile phones, TVs, Various consumer electronic products such as personal digital assistants, digital cameras, notebook computers, and desktop computers have become the mainstream of display devices. Most of the displays currently on the market are backlight liquid crystal displays, which include a backlight module (BM) and a liquid crystal display panel disposed on the light emitting side of the backlight module. The liquid crystal display panel uses the power plant to control the deflection of the liquid crys...

Claims

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Application Information

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IPC IPC(8): C09K19/44C09K19/30G02F1/1333
CPCC09K19/44C09K19/3003G02F1/1333
Inventor 康素敏李明郑晓阔梁瑞祥孙新战王小龙安险峰
Owner SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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