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Liquid-crystalline medium and liquid-crystal display comprising the same

A liquid crystal medium and medium 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 sex, the effect of favorable capacitive threshold

Pending Publication Date: 2019-04-02
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: higher operating voltages are required compared to displays using dielectrically positive liquid crystals
[0033] In addition to their relatively poor transmittance and their relatively long response times, the hitherto disclosed MLC displays, have other disadvantages
These are for example their relatively low contrast ratio, their relatively high viewing angle dependence and the difficulty in reproducing gray scales 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-crystalline medium and liquid-crystal display comprising the same
  • Liquid-crystalline medium and liquid-crystal display comprising the same
  • Liquid-crystalline medium and liquid-crystal display comprising the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0619] The following examples illustrate the invention without restricting it in any way. However, the physical properties make it clear to those skilled in the art what properties can be achieved and to what extent they can be adjusted. In particular, combinations of properties which can preferably be achieved are therefore well defined for the person skilled in the art.

[0620] Synthetic example

[0621] Synthetic exemplary formula B compound (with perpendicular to director (ε ⊥ ) of high dielectric constant).

[0622] Synthesis Example B1

[0623] Synthesis of 4,6-difluoro-3-(4-propyl-cyclohex-1-enyl)-7-trifluoromethoxy-dibenzofuran:

[0624]

[0625] Step 1.1: 3,2',3'-Trifluoro-4-trifluoromethoxy-biphenyl-2-ol

[0626]

[0627] 6-Bromo-2-fluoro-3-trifluoromethoxyphenol (2) (100g, 0.36mol), potassium carbonate (75g, 0.54mol), tris(dibenzylideneacetone)-dipalladium (0) (1.6g, 1.7mmol) and CataCXium A (2.0g, 5.3mmol) in THF (500mL) and distilled water (250mL)...

Embodiment B11 to B1

[0677] Compound Examples B1.1 to B1.3

[0678] Compounds of formula B-1 are for example

[0679]

[0680] The compound (CB-3-OT) has a glass transition temperature (T g ) is -49°C, the melting point is 69°C, the extrapolated clearing point (5%, in ZLI-4792) is 102°C, and the phase sequence is T g -49°C K69°C S A 86℃ N 98C I, △ε is 1.7 and ε ⊥ is 10.5.

[0681]

Embodiment B14 to B1

[0682] Compound Examples B1.4 to B1.6

[0683]

[0684] The compound (LB-3-OT) has a melting point of 62°C, an extrapolated clearing point (5%, in ZLI-4792) of 97°C, and a phase sequence of K 62°C S A 121℃ I, △ε is 2.5 and ε ⊥ is 10.5.

[0685]

[0686] The compound (LB-3-T) has a melting point of 89°C and a phase sequence of K 89°C S A 108°C I, the extrapolated clearing point (10%, in ZLI-4792) is 83°C, △ε is 3.5 and ε ⊥ is 12.5.

[0687]

[0688] Synthesis Example 1

[0689]

[0690] The following abbreviations are used in the synthesis examples.

[0691] DMAP 4-(dimethylamino)pyridine

[0692] MTB ether tert-butyl methyl ether

[0693] TEA Triethylamine

[0694] THF Tetrahydrofuran

[0695] Synthesis Example 1 (LB(S)-3-OT)

[0696] Synthesis of 4,6-difluoro-3-(4-propyl-cyclohex-1-enyl)-7-trifluoromethoxy-dibenzothiophene:

[0697]

[0698] Step 1.1: 3,2',3'-Trifluoro-4'-(4-Propyl-cyclohex-1-enyl)-4-trifluoromethoxy-biphenyl-2-ol

[0699] ...

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Abstract

The invention relates to a liquid-crystalline medium, preferably having a nematic phase and exhibiting a dielectric anisotropy of 0.5 or more, which comprises one or more compounds of formula B one ormore compounds of formula S in which denotes Denotes and the other parameters have the meanings given in the text, to the use thereof in an electro-optical display, particularly in an active-matrix display based on the IPS or FFS effect, to displays of this type which contain a liquid-crystalline medium of this type, and to the use of the compounds of formula S for the improvement of the transmission and / or response times of a liquid-crystalline medium which comprises one or more additional mesogenic compounds.

Description

technical field [0001] The present invention relates to novel liquid crystal media, especially for liquid crystal displays, and to these liquid crystal displays, especially to liquid crystals using the IPS (in-plane switching) or preferably FFS (fringe field switching) effect (both using dielectrically positive liquid crystals) monitor. The latter is also occasionally referred to as the SB-FFS (Super Bright FFS) effect. For this effect, dielectrically positive liquid crystals are used, which contain one or more compounds with high permittivity both parallel to and perpendicular to the molecular director, which leads to a large average permittivity and a high Dielectric ratio and at the same time preferably relatively small dielectric anisotropy. The liquid-crystalline medium optionally additionally comprises dielectrically negative, dielectrically neutral compounds or both. The liquid-crystalline medium is used for in-plane (ie planar) initial alignment. The liquid-crystal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/44G02F1/13
CPCC09K19/44G02F1/13C09K19/3048C09K19/3098C09K19/3402C09K2019/0466C09K2019/122C09K2019/123C09K2019/124C09K2019/3004C09K2019/301C09K2019/3019C09K2019/3025C09K2019/3408C09K2019/3422C09K19/3491C09K19/42G02F1/134363G02F1/137G02F1/13706
Inventor 真边笃孝C·布洛克H·普拉赫
Owner MERCK PATENT GMBH
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