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Liquid crystal composition and liquid crystal display element using same

A liquid crystal composition and compound technology, which is applied in liquid crystal materials, chemical instruments and methods, optics, etc., can solve the problems of screen burn-in, difficulty in screen burn-in, and insufficient drop mark effect, etc., and achieve less screen burn-in and high-speed Excellent responsiveness

Active Publication Date: 2015-10-07
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the problem of display burn-in caused by the polymeric compound added to the liquid crystal, and its effect on the suppression of drip marks is not sufficient. It is required to maintain the basic characteristics of the liquid crystal display element and at the same time be less prone to burn-in , Development of liquid crystal display elements with drop marks

Method used

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  • Liquid crystal composition and liquid crystal display element using same
  • Liquid crystal composition and liquid crystal display element using same
  • Liquid crystal composition and liquid crystal display element using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0638] Hereinafter, the present invention will be described in more detail by citing examples, but the present invention is not limited to these examples. In addition, "%" in the composition of a following Example and a comparative example means "mass %".

[0639] The characteristics measured in the examples are as follows.

[0640] T NI : Nematic-isotropic liquid phase transition temperature (°C)

[0641] Δn: Refractive index anisotropy at 20°C

[0642] Δε: Dielectric constant anisotropy at 20°C

[0643] η: Viscosity at 20°C (mPa·s)

[0644] gamma 1 : Rotational viscosity at 20°C (mPa·s)

[0645] VHR: Under the conditions of frequency 60Hz and applied voltage 5V, the voltage retention rate at 50°C (%)

[0646] VHR after heat resistance test: The TEG for VHR measurement (test element group) injected with the liquid crystal composition was kept in a constant temperature chamber at 135° C. for 45 minutes, and then measured under the same conditions as the above-mentioned ...

Embodiment 1

[0695] Compared with the liquid crystal composition of Comparative Example 1, the liquid crystal composition LC-1 of Example 1 has lower viscosity η and rotational viscosity γ1, and is superior in various display panel evaluation performance, process suitability, and solubility at low temperature.

Embodiment 2～4

[0697] Liquid crystal compositions (LC-2 to 4) having the compositions shown below were prepared, and their physical property values ​​were measured. In addition, using a liquid crystal display element, evaluations of burn-in, drop marks, process suitability, and solubility at low temperatures were performed. The results are shown below.

[0698] [Table 2]

[0699]

[0700] Liquid crystal compositions LC-2 to 4 of Examples 2 to 4 were found to have low viscosity η and rotational viscosity γ1, and were excellent in various display panel evaluation performance, process suitability, and solubility at low temperatures.

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Abstract

The present invention relates to a nematic liquid crystal composition useful as a liquid crystal display material, in which the dielectric anisotropy (Δε) thereof has a negative value, and to a liquid crystal display element that uses the liquid crystal composition. This liquid crystal composition has a liquid crystal phase in a wide temperature range, low viscosity, satisfactory solubility at low temperature, and high resistivity or voltage retention rate, and is stable against heat or light. Therefore, through use of this liquid crystal composition a VA-type or PSVA-type liquid crystal display element can be provided at high yield that has excellent display quality and that is not prone to display defects such as image retention or drop marks. A liquid crystal display element that uses this liquid crystal composition achieves both fast response and low incidence of display defects, and is useful particularly as an active-matrix-driven liquid crystal display element, and can be applied as a liquid crystal display element such as a VA-mode or PSVA-mode liquid crystal display element.

Description

technical field [0001] The present invention relates to a liquid crystal composition and a liquid crystal display element which are useful as components of a liquid crystal display device or the like. Background technique [0002] Liquid crystal display devices are being used in various measurement equipment including clocks and calculators, automotive panels, word processors, electronic notebooks, printers, computers, televisions, clocks, advertising display boards, etc. Typical liquid crystal display methods include TN (Twisted Nematic) type, STN (Super Twisted Nematic) type, VA (Vertical Alignment) type using TFT (Thin Film Transistor), and IPS (In-Plane Switching) type. The liquid crystal compositions used in these liquid crystal display elements are required to be stable against external factors such as moisture, air, heat, and light, to display a liquid crystal phase in as wide a temperature range as possible around room temperature, to have low viscosity, and to have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/30C09K19/12C09K19/14C09K19/16C09K19/18C09K19/20C09K19/24C09K19/34C09K19/54G02F1/13
CPCC09K19/3003C09K19/54C09K2019/0448C09K2019/122C09K2019/123C09K2019/3004C09K2019/301C09K2019/3016
Inventor 小川真治栗泽和树岩下芳典河村丞治根岸真
Owner DIC CORP
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