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Negative dielectric anisotropy liquid crystal composition

A liquid crystal composition and anisotropic technology, which can be applied to liquid crystal materials, chemical instruments and methods, etc., can solve the problems of reducing the splay elastic constant and affecting the response time of liquid crystal compositions.

Active Publication Date: 2016-01-20
SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rotational viscosity and the splay elastic constant of the liquid crystal composition also affect the response time of the liquid crystal composition, and reducing the rotational viscosity or increasing the splay elastic constant can improve the response time of the liquid crystal composition, but if the rotational viscosity is reduced, the expansion of the liquid crystal composition The flexural constant also decreases

Method used

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  • Negative dielectric anisotropy liquid crystal composition
  • Negative dielectric anisotropy liquid crystal composition
  • Negative dielectric anisotropy liquid crystal composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The structural formula of the third component in embodiment 1 Middle R 1 , R 2 Respectively hydrogen, fluorine, cyano, trifluoromethyl, trifluoromethoxy, alkyl of 1 to 8 carbon atoms, alkoxy of 1 to 8 carbon atoms, alkene oxide of 1 to 8 carbon atoms One of the alkenyl groups or alkenyl groups with 2 to 6 carbon atoms; A is a single bond, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,4-cyclohexylene, 1, 3-dioxane-2,5-diyl, tetrahydropyran-2,5-diyl, pyrimidine-2,5-diyl, 1,4-phenylene or ring hydrogen replaced by fluorine or chlorine One of the 1,4-phenylene; Z is -COO-, -CH 2 O-, -CH 2 CH 2 -, -CF 2 O- or single bond; L 1 , L 2 hydrogen, chlorine or fluorine, respectively; n is 1, 2 or 3. The liquid crystal compound of the third component used in Example 1 is one or more of them.

[0063]

[0064]

[0065] Embodiment 1 test data:

[0066] Test items

Embodiment 2

[0068]

[0069]

[0070] Embodiment 2 test data:

[0071] Test items

Embodiment 3

[0073]

[0074]

[0075] Embodiment 3 test data

[0076] Test items

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Abstract

The invention discloses a liquid crystal composition with negative dielectric anisotropy. The liquid crystal composition with negative dielectric anisotropy is characterized by comprising the following ingredients in percentage by weight: 10%-70% of a first-component liquid crystal compound shown in the structural formula (I), 15%-60% of a second-component liquid crystal compound shown in the structural formula (II), 2%-45% of a third-component liquid crystal compound shown in the structural formula (III), and 2%-30% of a fourth-component liquid crystal compound shown in the structural formula (IV). The liquid crystal composition with negative dielectric anisotropy has the characteristics of being proper in negative dielectric anisotropy, wide in nematic phase range, low in rotary viscosity and short in response time, and is applicable to liquid crystal displays driven by active matrix thin-film transistors with VA (Vertical Alignment), IPS (In-Plane-Switching) and FFS (Fringe Field Switching) modes.

Description

technical field [0001] The invention relates to a liquid crystal composition, in particular to a liquid crystal composition with negative dielectric anisotropy. Background technique [0002] Utilizing the different characteristics and working modes of liquid crystal materials, the device can be designed into various working modes. Among them, conventional displays generally use TN (twisted nematic mode) mode, STN (super twisted nematic mode) mode, ECB ( That is, electronically controlled birefringence mode) mode, VA (vertical alignment mode) mode, IPS (in-plane switching mode), FFS (fringe field switching) mode, etc., as well as improved modes of the above modes. Components working in TN and STN modes generally use positive dielectric anisotropy liquid crystals, ECB and VA modes use negative dielectric anisotropy liquid crystal compositions, and IPS and FFS modes can use positive dielectric anisotropy liquid crystal compositions , a liquid crystal composition with negative ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/46C09K19/32C09K19/30C09K19/20C09K19/18C09K19/14C09K19/12
Inventor 华瑞茂王奎张建立贾刚刚杨增家李雅敏
Owner SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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