A kind of microcapsule liquid crystal display device and its application

A technology of liquid crystal display and microcapsules, which is applied in the direction of liquid crystal materials, instruments, chemical instruments and methods, etc., can solve the problems that liquid crystal molecules cannot completely return to the plane state and affect the contrast of devices, and achieve high reflectivity and contrast, and drive The effect of low voltage

Active Publication Date: 2022-04-12
JIANGSU HECHENG DISPLAY TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing liquid crystal microcapsules are almost all prepared from cholesteric liquid crystal materials with positive dielectric anisotropy, which still have some disadvantages, such as the high driving voltage to switch the cholesteric liquid crystal into a planar state. , about 30V is needed, and the liquid crystal molecules cannot completely return to the planar state, which affects the contrast of the device

Method used

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  • A kind of microcapsule liquid crystal display device and its application
  • A kind of microcapsule liquid crystal display device and its application
  • A kind of microcapsule liquid crystal display device and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] Each compound listed in Table 2 and its weight percentage are formulated into liquid crystal composition HNL-1:

[0097] Table 2 Liquid crystal composition formulation and its conventional performance parameters

[0098]

[0099]

[0100] Add appropriate optically active substances to the above-mentioned HNL-1 to adjust it to a cholesteric reflection wavelength of about 540nm, and mix 80mL of dichloromethane with 1g of PMMA prepolymer (brand CM-211) pre-dissolved with 1wt% poly After the 400mL aqueous solution of methacrylic acid (PMAA) is mixed, add 20g cholesteric phase liquid crystal, after mixing uniformly to form emulsion, adopt solvent evaporation method to remove dichloromethane, obtain the aqueous solution containing the liquid crystal microcapsule of about 10 μm in diameter (which contains about 50wt % of liquid crystal microcapsules). Then the prepared liquid crystal microcapsule aqueous solution and 30wt% bone glue aqueous solution are mixed uniformly ...

Embodiment 2

[0104] Each compound listed in Table 3 and its weight percentage are formulated into liquid crystal composition HNL-2:

[0105] Table 3 Liquid crystal composition formulation and its conventional performance parameters

[0106]

[0107]

[0108] Add appropriate optically active substances to the above-mentioned HNL-2 to adjust it to a cholesteric reflection wavelength of about 590nm, mix 80mL of dichloromethane with 1g of PMMA prepolymer (brand CM-207) dissolved in advance with 1wt% poly After the 400mL aqueous solution of methacrylic acid (PMAA) is mixed, add 20g cholesteric phase liquid crystal, after mixing uniformly to form emulsion, adopt solvent evaporation method to remove dichloromethane, obtain the aqueous solution containing the liquid crystal microcapsule of about 10 μm in diameter (which contains about 50wt % of liquid crystal microcapsules). Then the prepared liquid crystal microcapsule aqueous solution and 30wt% bone glue aqueous solution are mixed evenly ...

Embodiment 3

[0112] To the HNL-2 prepared in Example 2, add an appropriate optically active substance to adjust it to a cholesteric reflection wavelength of about 620nm, and dissolve 80mL of dichloromethane with 1g of PMMA prepolymer (brand CM-207) in advance and After mixing 400mL aqueous solution mixed with 1wt% polymethacrylic acid (PMAA), add 20g of cholesteric liquid crystal, mix uniformly to form an emulsion, remove methylene chloride by solvent evaporation, and obtain an aqueous solution containing liquid crystal microcapsules with a diameter of about 10 μm (which contains about 50wt% liquid crystal microcapsules). Then the prepared liquid crystal microcapsule aqueous solution and 30wt% bone glue aqueous solution are mixed uniformly at a volume ratio of 1:1, and set aside.

[0113] Select conductive PET-ITO with a thickness of 75 μm as the first substrate, place it on a film coating machine and place it flat, and use the screw printing technology to coat a layer of liquid crystal mi...

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Abstract

The invention provides a microcapsule liquid crystal display device and its application. The microcapsule liquid crystal display device contains at least two layers of flexible conductive layers, and a microcapsule mixed layer sandwiched between at least two layers of flexible conductive layers. At least two layers of flexible conductive layers At least one layer in the layer is a transparent flexible conductive layer. When at least two layers of flexible conductive layers are transparent flexible conductive layers, any flexible conductive layer is provided with a light-absorbing layer on the side close to the microcapsule mixing layer. When there is only one layer When the flexible conductive layer is a transparent flexible conductive layer, the non-transparent flexible conductive layer is provided with a light-absorbing layer on the side close to the microcapsule mixed layer. The microcapsule mixed layer is composed of liquid crystal microcapsules and an adhesive bonding the liquid crystal microcapsules. The microcapsules are encapsulated with a cholesteric liquid crystal material comprising one or more compounds selected from the general formula I. The microcapsule liquid crystal display device provided by the invention has the characteristics of low driving voltage, high reflectivity and contrast, and flexible display, and is suitable for the field of electronic paper.

Description

technical field [0001] The invention relates to the field of liquid crystal display devices, in particular to a microcapsule liquid crystal display device and its application in the field of electronic paper. Background technique [0002] In the early 1970s, with the invention of Liquid Crystal Display (LCD), information display technology started a revolution. Because LCDs are lightweight, low-power flat-panel displays that provide visual readouts that meet the small size, light weight, and battery requirements of hand-held electronic devices, this display technology enables new classes of hand-held and other portable devices. Products appear in large numbers. Commercially, LCDs found widespread use first as digital readouts on watches, then in instruments, and later in hand-held computers, personal data assistants, and many other digital devices. Today, LCD technology has almost replaced cathode ray tubes in the fields of televisions and personal computers (PCs). [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1334G02F1/1335G02F1/137C09K19/54
CPCG02F1/1334G02F1/1335G02F1/13718C09K19/544
Inventor 王盼盼祝春才丁文全张文琦
Owner JIANGSU HECHENG DISPLAY TECHCO
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