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Liquid-crystalline medium

A technology of liquid crystal media and compounds, which is applied in the field of liquid crystal displays and can solve problems such as high rotational viscosity

Active Publication Date: 2014-03-26
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high birefringence liquid crystal materials known in the prior art generally also have high rotational viscosities at the same time, which in turn negatively affects the response time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0307] The following examples are intended to illustrate the invention without limiting it.

[0308] In this context, percentage data represent percentages by weight. All temperatures are expressed in degrees Celsius. m.p. means melting point, cl.p. = clearing point. Furthermore, C=crystalline state, N=nematic phase, S=smectic phase and I=isotropic phase. The data between these symbols represent the transition temperature. also,

[0309] V о Indicates threshold voltage, capacitive at 20°C [V]

[0310] Δn represents the optical anisotropy measured at 20 °C and 589 nm

[0311] Δε represents the dielectric anisotropy at 20 °C and 1 kHz

[0312] cp. means clearing point [°C]

[0313] K 1 Indicates the elastic constant, the "slope" deformation at 20°C, [pN]

[0314] K 3 Indicates the elastic constant, "bending" deformation at 20°C, [pN]

[0315] gamma 1 Indicates the rotational viscosity [mPa·s] measured at 20°C, measured in a magnetic field by the rotational method

...

Embodiment 1

[0320] Mode The compound of is prepared according to the following scheme:

[0321]

[0322] C43S B 75N96.2I; Δn=0.0594; Δε=0.1; γ 1 =43mpa s;

[0323] K 1 =15.78; K 3 =19.56

[0324] The following compounds were similarly prepared

[0325]

[0326] Mixture Example

[0327] Unless explicitly stated otherwise, electro-optical data were determined in a TN cell at 20°C at the first minimum (ie d·Δn value of 0.5 μm). Optical data are determined at 20°C unless expressly stated otherwise. All physical properties were determined according to "Merck Liquid Crystals, Physical Properties of Liquid Crystals", Status Nov. 1997, Merck KGaA, Germany and applied at a temperature of 20°C, unless expressly stated otherwise.

Embodiment M1

[0329]

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Abstract

The invention relates to a liquid-crystalline medium comprising at least one compound of the formula I, in which R1 has the meanings indicated in claim 1, and to the use thereof in liquid-crystalline media and in electro-optical liquid-crystal displays.

Description

field of invention [0001] The invention relates to a liquid crystal medium (LC medium), its use for electro-optic purposes, and a liquid crystal display comprising this medium. Background technique [0002] Liquid crystals are mainly used as dielectrics in display devices because the optical properties of such substances can be affected by an applied voltage. Electro-optical devices based on liquid crystals are very well known to those skilled in the art and can be based on various effects. Examples of such devices are cells with dynamic scattering, DAP (deformation of aligned phases) cells, guest / host cells, TN cells with twisted nematic structure, STN (super twisted nematic) cells, SBE (Superbirefringence effect) box and OMI (Optical Mode Interference) box. The most common display devices are based on the Schadt-Helfrich effect and have a twisted nematic structure. Furthermore, there are cells which operate with an electric field parallel to the substrate and liquid cry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/30C09K19/40C09K19/46C07C13/28C07C5/22G02F1/1333
CPCC09K19/3003C09K19/42C09K19/44C09K2019/0448C09K2019/0466C09K2019/3004C09K19/062C09K19/30C09K19/12C09K19/20C09K2019/3027C09K19/3066C09K19/3402
Inventor M·格贝尔H·赫施曼L·利曹V·雷芬拉特S·舍恩B·舒勒
Owner MERCK PATENT GMBH
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