Liquid crystal medium

Abstract

The present invention discloses liquid crystal medium based on a mixture of polar compounds, the use thereof for electro-optical purposes, and displays containing the medium, wherein the liquid crystal medium comprises two or three compounds in formula I from 14 to 20, selectively compound in formula II from 0 to 5, one or two compounds in formula III from 15 to 19, two compounds in formula IV from 20 to 23, selectively one compound in formula V from 0 to 7, one or two compounds in formula VI from 11 to 18, one compound in formula VII from 5 to 7, selectively one compound in formula VIII from 0 to 5and two or three compounds in formula IX from 15 to 20.

Description

technical field [0001] The present invention relates to liquid crystal media and liquid crystal displays comprising these media, in particular to active matrix addressed displays, and in particular to optically compensated bend (OCB) mode displays. Background technique [0002] There is a huge demand for liquid crystal displays (LCDs), especially of the matrix type, which simultaneously have very high resistivities over a wide operating temperature range and short response times even at low temperatures and low threshold voltages. In particular, there is a need for LC media for twisted nematic (TN) display cells, which facilitate the following advantages in the cell: [0003] - Extended range of nematic phases (in particular to low temperatures) [0004] - Ability to switch at extreme low temperatures (outdoor use, automotive, avionics) [0005] - Enhanced resistance to UV radiation (longer product life). [0006] For TV and display applications, LC media with fast respon...

AI Technical Summary

Problems solved by technology

These compositions however have significant disadvantages in terms of their physical properties

Among other disadvantages, most of them lead to unfavorable LCD performance, e.g., long response time, having too low resistivity and / or narrow operating temperature range

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