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Low dielectric frequency dependent liquid crystal composition and PM displayer containing the same

A liquid crystal composition and compound technology, applied in liquid crystal materials, instruments, nonlinear optics, etc., can solve problems such as deterioration of optical properties, increase of threshold voltage of liquid crystal composition, and low dielectric anisotropy

Active Publication Date: 2013-10-16
JIANGSU HECHENG DISPLAY TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In particular, when the display device is used in a low temperature state, the dielectric anisotropy of the liquid crystal composition becomes lower due to the deterioration of the frequency dependence of the dielectric anisotropy at low temperature, resulting in an increase in the threshold voltage of the liquid crystal composition , the optical performance is also degraded

Method used

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  • Low dielectric frequency dependent liquid crystal composition and PM displayer containing the same
  • Low dielectric frequency dependent liquid crystal composition and PM displayer containing the same
  • Low dielectric frequency dependent liquid crystal composition and PM displayer containing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] The liquid crystal composition of Example 1 was formulated according to the compounds and weight percentages listed in Table 4, and it was filled between the two substrates of the liquid crystal display for performance testing. The test data are shown in the following table:

[0098] Table 4 liquid crystal composition formula and test performance thereof

[0099]

Embodiment 2

[0101] The liquid crystal composition of Example 2 was prepared by each compound listed in Table 5 and the weight percentage, which was filled between the two substrates of the liquid crystal display for performance testing. The test data are shown in the following table:

[0102] Table 5 liquid crystal composition formula and test performance thereof

[0103]

[0104]

Embodiment 3

[0106]The liquid crystal composition of Example 3 was prepared by each compound listed in Table 6 and the weight percentage, which was filled between the two substrates of the liquid crystal display for performance testing. The test data are shown in the following table:

[0107] Table 6 liquid crystal composition formula and test performance thereof

[0108]

[0109]

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PUM

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Abstract

The invention provides a liquid crystal composition with low dielectric frequency dependence and its application in a PM (passive matrix) displayer. The liquid crystal composition comprises: a formula I compound accounting for 35-65% of the total weight of the liquid crystal composition; a compound that accounts for 5-35% of the total weight of the liquid crystal composition and is composed of a group selected from the general formula II-A, the general formula II-B, the general formula II-C and their combination; a general formula III compound accounting for 3-40% of the total weight of the liquid crystal composition; and a general formula IV compound accounting for 0-35% of the total weight of the liquid crystal composition. The composition has large dielectric anisotropy, a very low threshold voltage, good frequency dependence at low temperature and good steepness. The invention also provides a liquid crystal display device containing the liquid crystal composition.

Description

technical field [0001] The invention relates to a liquid crystal composition, in particular to a liquid crystal composition with low dielectric frequency dependence and its application in liquid crystal displays. Background technique [0002] For the liquid crystal display element, according to the driving method of the element, it is divided into PM (passive matrix, passive matrix) type and AM (active matrix, active matrix) type. PM is divided into static (static) and multiplex (multiplex) and other types. The display modes included in PM are divided into PC (phase change, phase change), TN (twist nematic, twisted nematic), STN (super twisted nematic, super twisted Nematic), ECB (electrically controlled birefringence, electrically controlled birefringence), OCB (optical compensated bend, optical compensation bending), IPS (in-plane switching, coplanar transition), VA (vertical alignment, vertical alignment) and other types. AM is divided into TFT (thin film transistor, thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/46C09K19/30C09K19/20C09K19/18G02F1/1333
Inventor 徐海彬韩文明贺笛马建胜刘云云吴凤
Owner JIANGSU HECHENG DISPLAY TECHCO