Polymer network liquid crystal dimming device

A technology of liquid crystal dimming and polymerizable compounds, applied in liquid crystal materials, instruments, optics, etc., can solve the problems of poor dimming performance, high device driving voltage, and high total light transmittance

Active Publication Date: 2019-03-01
JIANGSU HECHENG DISPLAY TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the research on polymer network-stabilized cholesteric liquid crystals (PSCT) is also very active. If cholesteric liquid crystals with different pitches are selected inside, the display state of the device can be between transparent state and colored scattering state. Switching between them makes it possible to produce high-contrast color liquid crystal display devices
However, the supertwisting of cholesteric liquid crystals in PSCT makes the device drive voltage very high
[0006] The existing polymeric network liquid crystal dimming devices in the prior art have the problems of high total light transmittance and poor dimming performance after power-on, and it is difficult to meet the needs of the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0255] The liquid crystal composition HNG700200-100 is prepared by each compound listed in Table 6 and the percentage by weight, HNG700200-100, I-3-13, photoinitiator-184, dichroic dye (will be numbered as 2, 13, 14 dichroic dyes are mixed at a mass ratio of 7:3:20) and mixed evenly at a mass ratio of 92.5:5.8:0.2:1.5, and then vacuum-infused into a 6 μm vertically aligned liquid crystal cell for performance testing and threshold voltage testing and saturation voltage data are shown in the table below:

[0256] Table 6 liquid crystal composition formula and test performance thereof

[0257]

[0258] HNG700200-100, Ⅰ-3-13, photoinitiator-184, dichroic dyes (made by mixing dichroic dyes numbered 2, 13, 14 at a mass ratio of 7:3:20) by mass ratio 92.5: 5.8: 0.2: 1.5 After mixing evenly, vacuum pour it into a 6μm vertically aligned liquid crystal cell, place the liquid crystal cell filled with the mixture at a main light wavelength of 365nm, and apply 30V at a light intensity ...

Embodiment 2

[0263] The liquid crystal composition TS029-1798 is prepared by each compound listed in Table 8 and the weight percentage, and TS029-1798, I-3-13, photoinitiator-184, dichroic dye (will be numbered as 2, 13, 14 dichroic dyes are mixed at a mass ratio of 7:3:20) and mixed evenly at a mass ratio of 92.5:5.8:0.2:1.5, and then vacuum-infused into a 6 μm vertically aligned liquid crystal cell for performance testing and threshold voltage testing and saturation voltage data are shown in the table below:

[0264] Table 8 liquid crystal composition formula and test performance thereof

[0265]

[0266]TS029-1798, Ⅰ-3-13, photoinitiator-184, and dichroic dyes (made by mixing dichroic dyes numbered 2, 13, and 14 at a mass ratio of 7:3:20) by mass ratio 92.5: 5.8: 0.2: 1.5 After mixing evenly, vacuum pour it into a 6μm vertically aligned liquid crystal cell, place the liquid crystal cell filled with the mixture at a main light wavelength of 365nm, and apply 30V at a light intensity o...

Embodiment 3

[0270] Each compound listed in Table 10 and percentage by weight are formulated into liquid crystal composition HNG700200-100, HNG700200-100, I-2-5, photoinitiator-184, dichroic dye (will be numbered as 2, 13, 14 dichroic dyes are mixed at a mass ratio of 7:3:20) and mixed evenly at a mass ratio of 91.5:5.8:0.2:2.5, and then vacuum-infused into a 6 μm vertically aligned liquid crystal cell for performance testing and threshold voltage testing and saturation voltage data are shown in the table below:

[0271] Table 10 liquid crystal composition formula and test performance thereof

[0272]

[0273] HNG700200-100, Ⅰ-2-5, photoinitiator-184, and dichroic dyes (made by mixing dichroic dyes numbered 2, 13, and 14 at a mass ratio of 7:3:20) by mass ratio 91.5: 5.8: 0.2: 2.5 After mixing evenly, vacuum pour into a 6μm vertically aligned liquid crystal cell, place the liquid crystal cell filled with the mixture at a wavelength of 365nm, and apply 30V at a light intensity of 30mw / c...

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PUM

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Abstract

The invention provides a polymer network liquid crystal dimming device. The dimming device includes an upper substrate layer, a lower substrate layer and a liquid crystal dielectric layer located between the upper substrate layer and the lower substrate layer; and the liquid crystal dielectric layer includes a polymeric compound, a nematic liquid crystal composition, dye and a photoinitiator, wherein the polymeric compound has a structure shown as a general formula I. The dimming device has appropriate threshold voltage and saturation voltage, low all-optical transmittance and good dimming performance; and the dimming device can have better light adjusting transmittance and dimming effects by adjusting the all-optical transmittance through voltage. The structure of the polymeric compound is shown as the general formula I.

Description

technical field [0001] The invention relates to a polymeric network liquid crystal dimming device, in particular to a polymeric network liquid crystal dimming device containing dyes. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1334G02F1/1337G02F1/137C09K19/52
CPCG02F1/1334G02F1/133723G02F1/13737C09K19/52G02F1/13345
Inventor 沈天宇丁文全王盼盼
Owner JIANGSU HECHENG DISPLAY TECHCO
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