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polymer network liquid crystal display

A liquid crystal display and polymer technology, applied in liquid crystal materials, instruments, chemical instruments and methods, etc., can solve the problems of low light transmittance, the contrast and light transmittance of display devices are difficult to meet the needs of technological development, etc.

Active Publication Date: 2019-01-25
JIANGSU HECHENG DISPLAY TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although PNLC has greatly improved performance compared to PDLC, the existing PNLC display still has the problem of low light transmittance when the viewing angle is large. At the same time, with the development of technology, the requirements for display contrast are also increasing. High, the contrast and light transmittance of existing display devices have been difficult to meet the needs of technological development. Therefore, there is an urgent need for a PNLC display. The display device not only requires good light transmittance at large viewing angles, but also requires Better contrast to meet the high requirements of technology development for display devices

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0171] The liquid crystal composition HNG700200-100 was formulated according to the compounds and weight percentages listed in Table 2, and it was filled between the two substrates of the liquid crystal display for performance testing. The test data are shown in the following table:

[0172] Table 2 Liquid crystal composition formula and its test performance

[0173]

[0174] After mixing HNG700200-100, Ⅰ-2-2, and photoinitiator-184 uniformly in a mass ratio of 94:5.9:0.1, vacuum pour it into a 6um vertically aligned liquid crystal cell, and place the liquid crystal cell filled with the mixture in the main light The wavelength is 365nm, the light intensity is 15mw / cm 2 Curing at room temperature for 5 min under a UV lamp to obtain a PNLC film. The light transmittance of the prepared PNLC film without an electric field is 86%, and a voltage of 30V is applied to the PNLC film. At this time, the light transmittance of the PNLC film is 6.6%, and the contrast is 13. At a viewin...

Embodiment 2

[0177] The liquid crystal composition HNG720200-100 was formulated according to the compounds and weight percentages listed in Table 3, and it was filled between the two substrates of the liquid crystal display for performance testing. The test data are shown in the following table:

[0178] Table 3 Liquid crystal composition formula and its test performance

[0179]

[0180] After mixing HNG720200-100, Ⅰ-1-1, and photoinitiator-184 uniformly in a mass ratio of 94:5.9:0.1, vacuum pour it into a 6um vertically aligned liquid crystal cell, and place the liquid crystal cell filled with the mixture in the main light The wavelength is 365nm, the light intensity is 20mw / cm 2 Curing at room temperature for 5 min under a UV lamp to obtain a PNLC film. The light transmittance of the prepared PNLC film without an electric field is 86%. Apply a voltage of 30V to the PNLC film. At this time, the light transmittance of the PNLC film is 9.5%, and the contrast ratio is 9. When the viewin...

Embodiment 3

[0182]The liquid crystal composition HNG721600-100 was formulated according to the compounds and weight percentages listed in Table 4, and it was filled between the two substrates of the liquid crystal display for performance testing. The test data are shown in the following table:

[0183] Table 4 Liquid crystal composition formula and its test performance

[0184]

[0185] After mixing HNG721600-100, polymers Ⅰ-2-2 and Ⅱ-1-2, and photoinitiator-184 in a mass ratio of 92:5.9:2:0.1, vacuum pour them into a 6um vertically aligned liquid crystal cell. Put the liquid crystal cell filled with the mixture under the main light wavelength of 365nm and the light intensity of 15mw / cm 2 Curing at room temperature for 5 min under a UV lamp to obtain a PNLC film. The light transmittance of the prepared PNLC film without an electric field is 87%, and a voltage of 30V is applied to the PNLC film. At this time, the light transmittance of the PNLC film is 6.2%, and the contrast is 14. At ...

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Abstract

The invention provides a polymer network liquid crystal display. The polymer network liquid crystal display comprises a first matrix layer, a first conducting layer, a first orientation layer, a liquid crystal dielectric layer, a second orientation layer, a second conducting layer and a second matrix layer, wherein the liquid crystal dielectric comprises a first component accounting for 1-15% of the total weight of the liquid crystal dielectric and a second component accounting for 85-99% of the total weight of the liquid crystal dielectric; a group composed of one or more polymerizable compounds having structures in general formula I and / or general formula II is used as the first component; and a nematic phase liquid crystal composition is used as the second component. The polymer network liquid crystal display is in a transparent state in case of zero electric field, and the light transmittance is higher than 85%; after voltage application, the polymer network liquid crystal display is in a scattering state; no visual angle problem exists in the transparent state; and in case of a 120-degree visual angle, the light transmittance is still higher than 80%. Therefore, the polymer network liquid crystal display provided by the invention has better off-state light transmittance and a bigger visual angle; and meanwhile, due to the small proportion of polymers, the polymer network liquid crystal display has lower drive voltage and can realize the reverse mode PDLC (polymer dispersed liquid crystal) effect of low-voltage driving. The general formula I and the general formula II are shown in the specification.

Description

technical field [0001] The invention relates to a liquid crystal display device, in particular to a polymer network liquid crystal display. Background technique [0002] In recent years, since polymer dispersed liquid crystal (PDLC) has shown strong advantages and great potential in the fields of optical switch and projection display, the research work in this field has been very active and great progress has been made. The conventional PDLC structure is to separate the nematic liquid crystal from an isotropic polymer material by phase separation, forming many micron-scale liquid crystal droplets, and changing the orientation of liquid crystal molecules by applying a certain electric field. The matching relation of the refractive index between the liquid crystal droplet and the polymer is adjusted, so as to realize the display of light modulation. [0003] PDLC has a simple preparation process, does not require polarizers, and can achieve high light transmittance, so it has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/46C09K19/44G02F1/1333
Inventor 王盼盼陈锐蝶周振婷徐海彬韩文明陈昭远
Owner JIANGSU HECHENG DISPLAY TECHCO
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