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Liquid crystal composition and liquid crystal display element manufactured using same

A technology of liquid crystal display elements and liquid crystal compositions, which is applied to liquid crystal materials, chemical instruments and methods, instruments, etc., can solve problems such as insufficient effects, and achieve the effects of less screen burn-in and excellent high-speed response

Inactive 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, in this method, there is a problem of burn-in on the display caused by the polymerizable compound added to the liquid crystal, and the effect is not sufficient for the suppression of drip marks, so it is necessary to develop Liquid crystal display elements with burn-in and drop marks

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0659] 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 %".

[0660] The characteristics measured in the examples are as follows.

[0661] T NI : Nematic-isotropic liquid phase transition temperature (°C)

[0662] Δn: Refractive index anisotropy at 20°C

[0663] Δε: Dielectric constant anisotropy at 20°C

[0664] η: Viscosity at 20°C (mPa·s)

[0665] gamma 1 : Rotational viscosity at 20°C (mPa·s)

[0666] VHR: Voltage retention rate (%) at 70°C under the conditions of frequency 60Hz and applied voltage 5V

[0667] VHR after heat resistance test: The TEG (test element group) for measuring VHR injected with the liquid crystal composition was kept in a constant temperature chamber at 120° C. for 30 minutes, and then measured under the same conditions as the above-mentioned VHR mea...

Embodiment 4～7

[0717] Liquid crystal compositions (LC-5 to 8) having the following compositions were prepared, and their physical property values ​​were measured. In addition, evaluations of burn-in, drop marks, process suitability, and solubility at low temperatures were performed using a liquid crystal display element. The results are shown below.

[0718] [Table 2]

[0719]

[0720] In the liquid crystal compositions LC-5 to 8 of Examples 4 to 7, the addition amount of the compound of formula (i) in the liquid crystal composition LC-6 of Example 5 was 4% by mass, so slightly inferior but still good results were obtained .

Embodiment 11～14

[0727] Liquid crystal compositions (LC-13 to 16) having the compositions shown below were prepared, and their physical property values ​​were measured. In addition, evaluations of burn-in, drop marks, process suitability, and solubility at low temperatures were performed using a liquid crystal display element. The results are shown below.

[0728] [Table 4]

[0729]

[0730] The liquid crystal compositions LC-13-16 of Examples 11-14 obtained favorable results.

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Abstract

The present invention relates to a liquid crystal composition for use in a liquid crystal display element. The present invention addresses the problem of providing: a liquid crystal composition which does not undergo the deterioration in various properties required for use in liquid crystal display elements, such as dielectric anisotropy, a bulk viscosity, a nematic phase upper-limit temperature, a rotational viscosity (γ1) and a voltage holding ratio or the deterioration in image sticking resistance of the display element, rarely undergoes the formation of dripping marks during the production thereof, enables a liquid crystal material to be ejected in a stable amount in an ODF step, has good solubility at lower temperatures, and is therefore suitable for use in liquid crystal display elements; and a liquid crystal display element manufactured using the liquid crystal composition. The present invention relates to: a liquid crystal composition which comprises compounds respectively represented by formula (i) and formula (ii-b) and has negative dielectric anisotropy; and a liquid crystal display element manufactured using the liquid crystal composition.

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 components have developed from being used for clocks and calculators to various measuring equipment, automotive panels, word processors, electronic notepads, 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 composition used in these liquid crystal display elements needs to be stable against external factors such as moisture, air, heat, and light. In addition, it needs to display a liquid crystal phase in as wide a temperature range as possible around room temperature, and have lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/30C09K19/12C09K19/14C09K19/16C09K19/18C09K19/20C09K19/38C09K19/54G02F1/13
CPCC09K19/3003C09K19/54C09K2019/0448C09K2019/123C09K2019/3004C09K2019/301C09K2019/3016G02F1/0045
Inventor 小川真治丹羽雅裕岩下芳典河村丞治根岸真
Owner DIC CORP
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