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Dielectric positive liquid crystal composition

A positive liquid crystal, composition technology, applied in liquid crystal materials, nonlinear optics, optics, etc., to achieve the effects of low voltage, excellent high temperature resistance and UV stability, and excellent performance

Active Publication Date: 2013-09-04
BEIJING CHENGZHI YONGHUA DISPLAY TECHNOLOGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far there is no single liquid crystal material used alone in liquid crystal displays that can meet the performance requirements without developing a composition with other performance characteristics

Method used

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  • Dielectric positive liquid crystal composition
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  • Dielectric positive liquid crystal composition

Examples

Experimental program
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Effect test

Embodiment Construction

[0035] The present invention will be further described in detail below in conjunction with specific embodiments. Each component used in the following examples can be synthesized by known methods or obtained through commercial channels. In the following examples, the preparation of the liquid crystal composition is synthesized according to well-known conventional methods, such as heating, ultrasonication, suspension, etc., and mixed according to the specified ratio.

[0036] The percentages in this specification are mass percentages, the temperature is Celsius (°C), and the specific meanings and test conditions of other symbols are as follows:

[0037]cp (°C) represents the clearing point of liquid crystal; S-N represents the melting point (°C) from crystal state to nematic phase of liquid crystal; △n is optical anisotropy, no is the refractive index of ordinary light, and ne is the refractive index of extraordinary light , the test conditions are: 589nm, 25°C; △ε is the diele...

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Abstract

The invention discloses a dielectric positive liquid crystal composition which comprises 1%-4% of a dielectric positive compound of a first dielectric positive component A shown in a general formula I, 1%-50% of a second dielectric positive component B comprising a dielectric positive compound shown in a general formula II and / or a dielectric positive compound shown in a general formula III, and 10%-80% of a dielectric neutral compound of a dielectric neutral component C shown in a general formula IV, and in addition, an optically active compound accounting for 0-0.5% of the mass sum of the liquid crystal composition is added. The dielectric positive liquid crystal composition has the characteristics of low viscosity, short response time, proper optical anisotropy and dielectric anisotropy and excellent high temperature resistance, and is particularly suitable for manufacturing of active matrix TN-TFT (twisted nematic-thin film transistor), IPS-TFT (in-plane switching-thin film transistor) or FFS (fringe field switching) liquid crystal display elements and liquid crystal displays with quick response.

Description

technical field [0001] The invention relates to a liquid crystal compound, in particular to a dielectrically positive liquid crystal composition. Background technique [0002] Liquid crystal display elements can be divided into the following modes according to different display methods: twisted nematic (TN) mode, super twisted nematic (STN) mode, in-plane mode (IPS), and vertical alignment (VA) mode. Regardless of the display mode, the liquid crystal composition used is required to have the following characteristics: [0003] (1) Stable chemical and physical properties; [0004] (2) Low viscosity; [0005] (3) Appropriate dielectric anisotropy (△ε); [0006] (4) Appropriate double deflection rate (△n); [0007] (5) Good compatibility with other liquid crystal compounds. [0008] With the continuous maturity of the active matrix (TFT) technology formed in the early 1990s, color liquid crystal flat panel displays have developed rapidly, and thin film transistor displays (...

Claims

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Application Information

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IPC IPC(8): C09K19/46C09K19/44G02F1/1333
Inventor 夏治国华瑞茂丰景义毛联波
Owner BEIJING CHENGZHI YONGHUA DISPLAY TECHNOLOGY CO LTD
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