liquid crystal medium

A liquid crystal medium, medium technology, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of image retention, image burning, etc.

Active Publication Date: 2011-11-30
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0030] In LCD TV applications, if the display has been addressed (angesteuert) for longer periods of time, so-called reliability problems often arise, such as image retention, i.e. "burned" images seen

Method used

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  • liquid crystal medium
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0042] a) R in formula I 1 and R 1＊ Indicates straight-chain alkyl, especially C 2 h 5 , n-C 3 h 7 , n-C 4 h 9 , and n-C 5 h 11 , n-C 6 h 13 . Particularly preferably, R 1 means n-C 3 h 7 and R 1＊ means CH 3 、C 2 h 5 or n-C 3 h 7 .

[0043] b) Liquid-crystalline media comprising one, two, three, four or more, preferably one, two or three compounds of the formula I.

[0044] c) liquid-crystalline media in which the proportion of compounds of the formula I in the overall mixture is ≧3% by weight, preferably ≧10% by weight, particularly preferably ≧15% by weight. Particular preference is given to liquid-crystalline media comprising 3 to 50%, preferably 25 to 35%, of one or more compounds of the formula I. Compounds of formula I in which a=0 are preferably contained in the mixture in an amount of 15-35%. Compounds of formula I in which a=1 are preferably contained in the mixture in an amount of 3-30%.

[0045] d) Preferred compounds of formula I are compoun...

Embodiment 1

[0301]

Embodiment 2

[0303]

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Abstract

The invention relates to a liquid crystal medium having negative dielectric anisotropy, comprising at least one compound of the formula (I), where R1, R1*, and a have the meanings indicated in Claim 1, and to the use thereof for an active matrix display, particularly based on the VA, PS-VA, PALC, FFS, or IPS effect.

Description

field of invention [0001] The invention relates to liquid-crystalline media comprising at least one compound of the formula I and having negative dielectric anisotropy [0002] [0003] in [0004] R 1 and R 1＊ each independently of each other represents an alkyl group having 1-6 C atoms, and [0005] a means 0 or 1. Background technique [0006] Such media can be used in particular for electro-optical displays with active-matrix addressing based on the ECB effect and for IPS (In-Plane Switching) displays or FFS (Fringe Field Switching) displays. [0007] The principle of electrically controlled birefringence, the ECB effect (electrically controlled birefringence) or also the DAP (Alignment Distortion) effect was first described in 1971 (M.F.Schieckel and K.Fahrenschon, "Deformation of nematic liquid crystals with vertical orientation in electrical fields" , Appl. Phys. Lett. 19 (1971), 3912). Then there are the works of J. F. Kahn (Appl. Phys. Lett. 20 (1972), 1193...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/30C09K19/44
CPCC09K2019/3408C09K2019/0411C09K19/44C09K2019/0407C09K2019/3004C09K2019/0448C09K2019/301C09K19/32C09K19/3001C09K2019/3425C09K19/3003C09K2019/3016C09K2019/3027C09K2323/00C09K19/12
Inventor M·克拉森-梅默M·布雷默K·施奈德D·保卢特
Owner MERCK PATENT GMBH
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