Liquid-crystal display element and substrate used in same

A technology of liquid crystal display elements and substrates, which can be used in liquid crystal materials, applications, household appliances, etc., and can solve problems such as increased driving voltage and critical voltage

Inactive Publication Date: 2012-07-18
KYUSHU UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the threshold voltage for unwinding the helix is ​​increased, which is accompanied by a problem that the driving voltage of the liquid crystal display element is increased.

Method used

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  • Liquid-crystal display element and substrate used in same
  • Liquid-crystal display element and substrate used in same
  • Liquid-crystal display element and substrate used in same

Examples

Experimental program
Comparison scheme
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example

[0498] The following examples illustrate the present invention in more detail, but the present invention is not limited thereto.

[0499] In this specification, I represents a non-liquid crystal isotropic phase, N represents a nematic phase, N* represents a chiral nematic phase, BP represents a blue phase, and BPX represents an optically isotropic liquid crystal phase that does not observe more than two colors of diffracted light, and Sometimes the I-N phase transition point is called N-I point, the I-N* phase transition point is called N*-I point, and the I-BP phase transition point is called BP-I point.

[0500] In the examples and the like in this specification, the measurement and calculation of physical property values ​​and the like are carried out by the methods described later, and most of them are the methods described in the Japan Electronic Machinery Manufacturers Association standard EIAJ-ED-2521A or methods obtained by modifying the methods.

[0501] Determination...

example 11

[0547] After the glass substrate is cleaned, the surface is modified by ozone treatment. The glass substrate and organosilane coupling agent SE (n-octadecyltrimethoxysilane, Gelest Inc.) were sealed in a TeflonTM airtight container under atmospheric pressure, and then the airtight container was placed in a heating electric furnace It was left to stand for a certain period of time (about 3 hours) to manufacture an organosilane film-coated substrate SE1. Organosilane film-coated substrate SE2 was also produced using organosilane coupling agent SE for a glass substrate (Alone Co., Ltd., chromium-attached electrode substrate) on which comb-shaped electrodes were arranged on one surface.

[0548] Substrates SA1 and SA2 (Example 7) and substrates SB1 and SB2 (Example 8) were produced under the same conditions as substrates SE1 and SE2 (Example 11), except that organosilane coupling agents SA to SD or SF were used instead of organosilane coupling agent SE. , substrates SC1 and S...

example 16

[0610] The rubbed liquid crystal cell of Example 16 easily exhibited a monochromatic blue phase.

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PUM

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Abstract

Provided is a substrate used in a liquid-crystal display element, said substrate comprising at least two substrates disposed opposite each other and a blue phase liquid-crystal material between the substrates, wherein the polar component of the surface free energy of the substrate surfaces in contact with the liquid-crystal material is less than 5 mJ / m <-2>. Also provided is a substrate used in a liquid-crystal display element, said substrate comprising at least two substrates disposed opposite each other and a blue phase liquid-crystal material between the substrates, wherein the polar component of the surface free energy of the substrate surfaces in contact with the liquid-crystal material is between 5 and 20 mJ / m <-2> and the contact angle of an isotropic phase of the liquid-crystal material with the substrate surface is 50 DEG or less.

Description

technical field [0001] The invention relates to a liquid crystal display element and a substrate used in the element. More specifically, the present invention relates to a liquid crystal display element using a liquid crystal material exhibiting a blue phase, and a substrate used in the element. Background technique [0002] Liquid crystal display elements using liquid crystal compositions are widely used in displays of clocks, electronic calculators, word processors, and the like. These liquid crystal display elements utilize the refractive index anisotropy, dielectric constant anisotropy, etc. of liquid crystal compounds. The operating modes of liquid crystal display elements are mainly known: phase change (PC) mode using more than one polarizer for display, twisted nematic (TN) mode, super twisted nematic (STN) mode, bistable twisted nematic (BTN) mode, electrically controlled birefringence (ECB) mode, optically compensated bending (OCB) mode, transverse electric field ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/137C09K19/02C09K19/12C09K19/14C09K19/16C09K19/18C09K19/20C09K19/22C09K19/24C09K19/26C09K19/28C09K19/30C09K19/32C09K19/34C09K19/38C09K19/54G02F1/13G02F1/1333G02F1/1337
CPCC09K19/588C09K19/322C09K19/0275C09K19/54C09K19/3405C09K19/32G02F2001/13775C09K19/3458C09K2019/343C09K2019/323G02F2201/124C09K2019/3408G02F2001/13793G02F1/133719C09K2323/06C09K2323/02G02F1/13793G02F1/13775G02F1/13306G02F1/137B32B2457/202
Inventor 菊池裕嗣山本真一长谷场康宏国信隆史
Owner KYUSHU UNIV
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