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Liquid crystal medium and liquid crystal display containing liquid crystal medium

A liquid crystal medium and display technology, applied in the direction of liquid crystal materials, instruments, chemical instruments and methods, etc., can solve the problems of low contrast, insufficient life, high operating voltage, etc., and achieve high positive dielectric anisotropy, good low temperature stability, favorable The effect of capacitance threshold

Pending Publication Date: 2019-02-05
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these displays using dielectrically negative liquid crystals have a serious disadvantage: they require higher operating voltages than individual displays using dielectrically positive liquid crystals
[0033] The hitherto disclosed MLC displays, besides their relatively poor transmittance and their relatively long response times, also have other disadvantages
These are for example their relatively low contrast ratio, their relatively high viewing angle dependence and difficulty in grayscale reproduction in these displays, especially when viewed from oblique viewing angles, as well as their insufficient VHR and their insufficient lifetime

Method used

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  • Liquid crystal medium and liquid crystal display containing liquid crystal medium
  • Liquid crystal medium and liquid crystal display containing liquid crystal medium
  • Liquid crystal medium and liquid crystal display containing liquid crystal medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0551] The following mixture (M-1) was prepared and studied.

[0552]

[0553] This mixture, mixture M-1, has a dielectric ratio (ε ⊥ / △ε),5.04mPa·s / pN(γ 1 / k 11 ) ratio and are characterized by very good transmittance in FFS displays and exhibit very short response times.

[0554] 0.050% of STA-1-1 was added to mixture M-1. The stability of the resulting mixture M-1.1 was investigated and found to be excellent.

Embodiment 2

[0556] The following mixture (M-2) was prepared and studied.

[0557]

[0558] This mixture, mixture M-2, has a dielectric ratio (ε ⊥ / △ε),4.02mPa·s / pN(γ 1 / k 11 ) ratio and are characterized by very good transmittance in FFS displays and exhibit very short response times.

[0559] 0.050% of STA-1-1 was added to mixture M-2. The stability of the resulting mixture M-2.1 was investigated and found to be excellent.

Embodiment 3

[0561] The following mixture (M-3) was prepared and studied.

[0562]

[0563] This mixture, mixture M-3, has a dielectric ratio (ε ⊥ / △ε),4.05mPa·s / pN(γ 1 / k 11 ) ratio and are characterized by very good transmittance in FFS displays and exhibit very short response times.

[0564] 0.050% of STA-1-1 was added to mixture M-3. The stability of the resulting mixture M-3.1 was investigated and found to be excellent.

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Abstract

The invention relates to a liquid crystal medium which contains one or more compounds as shown in formula I, wherein the definition of the structure as shown in the specification is represented in thespecification, and the definitions of other parameters are as shown in the specification. The invention relates to the application of the liquid crystal medium in an electro-optic display, in particular in an active matrix display based on the IPS or FFS effect, relates to a display containing the liquid crystal medium, and relates to the application of a compound as shown in formula I for improving the transmissivity and / or response time of a liquid crystal medium containing one or more additional mesomorphic compounds.

Description

technical field [0001] The present invention relates to new types of liquid crystal media, in particular for liquid crystal displays, and these liquid crystal displays, in particular using liquid crystals utilizing the IPS (In-Plane Switching) or preferably FFS (Fringe Field Switching) effect of dielectrically positive liquid crystals monitor. Occasionally the latter is also referred to as the SB-FFS (Super Brightness FFS) effect. For this effect, dielectrically positive liquid crystals are used that contain one or more compounds that have both high dielectric constants parallel to the molecular director and perpendicular to the molecular director, which lead to large average dielectric constants and high dielectric constants. The electrical ratio and preferably at the same time lead to a relatively small dielectric anisotropy. The liquid-crystalline medium optionally additionally comprises dielectrically negative, dielectrically neutral compounds or both. The liquid-crysta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/12C09K19/14C09K19/30C09K19/34C09K19/46C09K19/44C09K19/54G02F1/1343
CPCC09K19/12C09K19/14C09K19/30C09K19/3003C09K19/3048C09K19/3066C09K19/3068C09K19/3098C09K19/3405C09K19/3491C09K19/44C09K19/46C09K19/54G02F1/134363C09K2019/3422C09K2019/305C09K2019/3053C09K2019/3077C09K2019/3078C09K2019/3004C09K2019/3025C09K2019/3021C09K2019/301C09K2019/3016C09K2019/123C09K2019/122G02F1/134372C09K19/34C09K2019/0466C09K2019/3009C09K2019/3027C09K2019/3408C09K19/3483C09K19/42C09K19/3402C09K19/3444C09K19/3458G02F1/13C09K19/52G02F1/1362
Inventor 薛彦鹏宋超韩家龙饶真玮张新洋黄洋
Owner MERCK PATENT GMBH