Nematic phase liquid crystal composition

A technology of liquid crystal composition and nematic phase, which is applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve the problems of poor low temperature performance, difficult synthesis, and few compounds, and achieve improved frequency dependence, increased charge retention rate, Effect of improving temperature dependence
CN101338199AInactive Publication Date: 2009-01-07JIANGSU HECHENG DISPLAY TECHCO
0 Cites 9 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
JIANGSU HECHENG DISPLAY TECHCO
Publication Date
2009-01-07
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to a nematic liquid crystal combination used for TN, STN, TFT displaying devices, which comprises one of a general formula (I) or / and (II) or a plurality of bicyclo system derivatives. X' is selected from F and Cl, and F is optimized. Ra, Rb, Ra' and Rb' are respectively and independently selected from alkyl, alkoxy, alkenyl, alkenoxy, fluoroalkyl, fluoroalkoxy, fluoroalkenyl or fluoroalkenoxy. The combination is characterized in that difluoro chain hydrocarbon derivatives are used for various displays to result in the lowered low temperature FNP and increased low temperature stability of the combination. Especially under low temperature, the responding time is very fast. In STN displaying, the gradient performance can be improved, and the information capacity of the display can be improved. In the displaying of TN caproic TN type TFT, the gray scale display can be improved and the color expression ability can be enriched.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to liquid crystal compositions, especially nematic liquid crystal compositions, as liquid crystal materials. Background technique

[0002] Currently, liquid crystal displays are widely used, and liquid crystal materials are developing rapidly, especially nematic liquid crystal materials are developing the fastest. Nematic twisted nematic (TN for short) displays are known from M. Helfrich, Appl. Phys. Lett., 18, 127 (1971). In the TN display mode, the manufacturing process of TN displays is relatively simple, the process control is relatively easy, and the selection of liquid crystal materials is relatively wide and common. The types of liquid crystals used in the TN display mode include esters, biphenylnitriles, pyrimidines, dioxanes, cyclohexylbiphenyls, and the like. Various types of liquid crystal monomers have the following performance characteristics:

[0003] (1), biphenyl liquid crystal: low viscosity, large bire...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More