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Liquid crystal composition and liquid crystal display element using same

A technology for liquid crystal compositions and compounds, applied in liquid crystal materials, chemical instruments and methods, instruments, etc., can solve problems such as insufficient effects, and achieve the effects of less drip marks, less screen burn-in, and excellent high-speed responsiveness.

Active Publication Date: 2015-07-22
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 drop marks is not sufficient. Therefore, it is necessary to develop Liquid crystal display element 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 1

[0251] A liquid crystal composition having the composition shown below was prepared, and its physical property values ​​were measured. The results are shown in the table below.

[0252] Use the liquid crystal composition of embodiment 1, make figure 1 The VA liquid crystal display element shown. This liquid crystal display element has an inverse stagger type thin film transistor as an active element. The injection of the liquid crystal composition was performed by a dropping method, and evaluations of burn-in, drop marks, process suitability, and solubility at low temperatures were performed.

[0253] In addition, the symbol on the left side of the content is the abbreviation description of the said compound.

[0254] [chem 29]

[0255] Example 1

[0256]

[0257] [Table 1]

[0258] T NI / ℃

[0259] It can be seen that the liquid crystal composition of Example 1 has a liquid crystal phase temperature range of 75.2°C which is practical as a liquid crystal c...

Embodiment 2 and 3

[0276] Prepare a liquid crystal composition having the composition shown below, designed so as to have the same liquid crystal phase temperature range, the same refractive index anisotropy value, and the same dielectric constant anisotropy value as the composition of Example 1, Measure its physical properties. The results are shown in the table below.

[0277] Using the liquid crystal compositions of Examples 2 and 3, a VA liquid crystal display element was fabricated in the same manner as in Example 1, and evaluated for burn-in, drop marks, process suitability, and solubility at low temperatures, and the results are shown in the same table.

[0278] [Table 4]

[0279]

[0280] It can be seen that the liquid crystal compositions of Examples 2 and 3 have a practical liquid crystal phase temperature range as a TV liquid crystal composition, have a large absolute value of dielectric constant anisotropy, have low viscosity and optimum Δn. Use the liquid crystal composition de...

Embodiment 4 and 5

[0282] Prepare a liquid crystal composition having the composition shown below, designed so as to have the same liquid crystal phase temperature range, the same refractive index anisotropy value, and the same dielectric constant anisotropy value as the composition of Example 1, Measure its physical properties. The results are shown in the table below.

[0283] Using the liquid crystal compositions of Examples 4 and 5, a VA liquid crystal display element was produced in the same manner as in Example 1, and evaluations of burn-in, drop marks, process suitability, and solubility at low temperatures were performed, and the results are shown in the same table.

[0284] [table 5]

[0285]

[0286] It can be seen that the liquid crystal compositions of Examples 4 and 5 have a practical liquid crystal phase temperature range as a TV liquid crystal composition, have a large absolute value of dielectric constant anisotropy, have low viscosity and optimum Δn. Use the liquid crystal ...

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Abstract

The present invention pertains to a liquid crystal composition used in a liquid crystal display element. The present invention addresses the problem of providing a liquid crystal composition that is characterized in: that various properties of a liquid crystal display element such as a dielectric anisotropy, a bulk viscosity, a nematic-phase upper limit temperature, a rotation viscosity γ1, and a voltage holding ratio, as well as the burn-in property of a display element are not impaired; that it is less likely that dropping marks occur at the time of manufacture; that a stable eject amount of a liquid crystal material in an ODF step is achieved; and the suitability to a liquid crystal display element having an excellent solubility at a low temperature. Besides, the present invention addresses the problem of providing a liquid crystal display element in which the liquid crystal composition is used. The present invention pertains to a liquid crystal composition that contains a compound expressed by an expression (I), one or more kinds of compounds expressed by a general expression (II-1), and one or more kinds of compounds expressed by a general expression (II-2), and that has a negative dielectric anisotropy. The present invention also pertains to a liquid crystal display element in which the liquid crystal composition is used.

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 liquid crystal display devices and the like. Background technique [0002] Liquid crystal display devices are 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 composition used in these liquid crystal display elements needs to be stable against external factors such as moisture, air, heat, light, etc., display a liquid crystal phase in as wide a temperature range as possible around room temperature, and have low viscosity and low driving voltage. F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/42G02F1/13C09K19/12C09K19/30C09K19/34C09K19/52
CPCC09K2019/3004C09K2019/3016C09K19/3003C09K19/44C09K2019/3027C09K2019/122C09K2019/301C09K2019/3009
Inventor 岩下芳典丹羽雅裕小川真治
Owner DIC CORP
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