Liquid crystal medium and liquid crystal display

Abstract

The present invention relates to dielectrically positive liquid-crystalline media comprising in each case one or more compounds of the three formulae IA, IB and IC: in which the parameters have the respective meanings indicated in the specification, and optionally one or more further dielectrically positive compounds and optionally one or more further dielectrically neutral compounds, and to liquid-crystal displays containing these media, especially to active-matrix displays and in particular to TN, IPS and FFS displays.

Description

technical field [0001] The present invention relates to liquid crystal media and to liquid crystal displays containing these media, in particular to active matrix addressed displays, more particularly to displays of the twisted nematic (TN), in-plane switching (IPS) or fringe field switching (FFS) type. Background technique [0002] Liquid crystal displays (LCDs) are used in many areas for information display. LCDs are used in direct-view displays as well as in projection-type displays. The electro-optic modes used are, for example, twisted nematic (TN), super twisted nematic (STN), optically compensated bending (OCB) and electrically controlled birefringence (ECB) modes and their various variants, among others. All of these modes utilize an electric field substantially perpendicular to the substrate or liquid crystal layer. In addition to these modes, there are also electro-optic modes utilizing an electric field substantially parallel to the substrate or liquid crystal l...

AI Technical Summary

Problems solved by technology

However, these compositions have serious disadvantages

Among these defects, most of them disadvantageously result in long addressing times, have insufficient resistivity values ​​and / or require excessively high operating voltages

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