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Liquid crystal composition with stable threshold voltage and application thereof

A technology of liquid crystal composition and threshold voltage, which is applied in liquid crystal materials, optics, instruments, etc., and can solve problems such as the decline of display effect

Active Publication Date: 2014-07-23
BEIJING BAYI SPACE LCD MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The liquid crystal display is limited by the temperature range of the liquid crystal. As the temperature changes, the photoelectric characteristics of the liquid crystal will change accordingly, resulting in a sharp drop in the display effect caused by the temperature change. At the same time, with the change of the driving voltage frequency, the photoelectric characteristics of the liquid crystal will also change. will change, so the display will also degrade

Method used

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  • Liquid crystal composition with stable threshold voltage and application thereof
  • Liquid crystal composition with stable threshold voltage and application thereof
  • Liquid crystal composition with stable threshold voltage and application thereof

Examples

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preparation example Construction

[0092] The preparation of liquid crystal composition in the embodiment of the present invention all adopts following method:

[0093] The preparation of uniform liquid crystal adopts the thermal dissolution method commonly used in the industry. First, the liquid crystal compound is weighed by weight percentage with a balance. There is no specific requirement for the order of weighing and adding. Usually, the liquid crystal compound is weighed and mixed in order of melting point from high to low. Heat and stir at 60-100°C to make each component melt evenly, then filter, spin evaporate, and finally package to obtain the target sample.

[0094] Unless otherwise stated, percentages in this context are by weight and all temperatures are given in degrees Celsius. Use the following abbreviations:

[0095] Δn is optical anisotropy (20°C), Δε is dielectric constant anisotropy (25°C, 1000Hz), V 10 is the threshold voltage, which is the characteristic voltage (V, 25°C) when the relativ...

Embodiment 1

[0107] Take the liquid crystal compound in the following weight percentages and prepare the liquid crystal composition by the method described in the present invention. The specific proportion and the performance parameters of the obtained liquid crystal composition are shown in Table 1:

[0108] The weight percent and performance parameter of each component in the liquid crystal composition of table 1 embodiment 1

[0109] category

[0110] I

Embodiment 2

[0112] Take the liquid crystal compound in the following weight percentages and prepare the liquid crystal composition by the method described in the present invention. The specific proportion and the performance parameters of the obtained liquid crystal composition are shown in Table 2:

[0113] The weight percent and performance parameter of each component in the liquid crystal composition of table 2 embodiment 2

[0114] category

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Abstract

The invention relates to a liquid crystal composition with a stable threshold voltage and an application thereof. The liquid crystal composition comprises the following components: (1) 5%-40% of a compounds shown in a general formula I; (2) 10%-40% of a compound shown in a general formula II; compounds with a dioxyheterocycle structure are taken as polar ingredients of the liquid crystal composition to overcome the defect that the photoelectric characteristic of the liquid crystal composition changes with frequency; the polar ingredients composed of compound type I having a difluoromethoxyl structure and the compound type II having a 3,4,5-trifluoro-benzene structure are used together for regulating the voltage temperature stability of the liquid crystal composition, so that the voltage characteristic of the liquid crystal composition does not change with the temperatures, and therefore the display effect of the liquid crystal composition is improved.

Description

technical field [0001] The invention relates to a liquid crystal composition with stable threshold voltage and an application thereof, belonging to the technical field of liquid crystal display. Background technique [0002] At present, liquid crystals are widely used in the field of information display, and at the same time, some progress has been made in the application in optical communication (S.T.Wu, D.K.Yang. Reflective Liquid Crystal Displays. Wiley, 2001). In recent years, the application fields of liquid crystal compounds have been significantly expanded to various display devices, electro-optic devices, electronic components, sensors, etc. For this reason, many different structures have been proposed, especially in the field of nematic liquid crystals, and nematic liquid crystal compounds have been most widely used in flat panel displays so far. Especially for TFT active matrix systems. [0003] Liquid crystal display has experienced a long development path with ...

Claims

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Application Information

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IPC IPC(8): C09K19/44G02F1/1333
Inventor 陈海光陈卯先杭德余姜天孟田会强储士红贺树芳张琳孙丽丽
Owner BEIJING BAYI SPACE LCD MATERIALS TECH
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