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Trans-polymer dispersed liquid crystal material, trans-polymer dispersed liquid crystal light valve and application of light valve

A technology for dispersing liquid crystals and polymers. It is applied in liquid crystal materials, optics, nonlinear optics, etc., and can solve the problems of high frequency driving power consumption, complex polymerization process, and narrow selection of liquid crystal materials.

Pending Publication Date: 2019-07-16
JIANGSU HECHENG DISPLAY TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The device relies on the characteristics of dual-frequency liquid crystals to realize the transition between the light-transmitting state and the fog state. It is necessary to polymerize the dual-frequency liquid crystal and glue into a film under the drive of a low-frequency electric field, and then change the refractive index of the liquid crystal through a high-frequency electric field. The polymerization conditions are complicated. The power consumption of high-frequency drive is also large
[0004] Chinese patent CN106336875A discloses a method for preparing a trans-polymer dispersed liquid crystal film. Part of the technical scheme uses cholesteric liquid crystals (compounds 7, 8, and 9 have chirality) to form parallel-arranged cholesteric liquid crystals through stepwise polymerization. State, and then driven by an electric field to form a focal conic state, forming a fog state effect. The disadvantage is that the polymerization conditions are complicated, and the transparency of the light-transmitting state effect is relatively poor; there are also some technical solutions that use negative nematic liquid crystals to polymerize in a parallel state. Form a light-transmitting state, then turn on the power, and use the dynamic scattering effect of liquid crystal molecules to form a fog state. The disadvantage is that the power consumption is large, and it will generate heat after long-term driving
There is also the problem of complex polymerization process. In addition, the selection of liquid crystal materials is narrow, and the implementation is more limited.
[0008] It can be seen from the above that most of the trans PDLCs in the prior art have the problems of complex process and poor effect. Trans PDLC display device with excellent performance and strong impact resistance

Method used

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  • Trans-polymer dispersed liquid crystal material, trans-polymer dispersed liquid crystal light valve and application of light valve
  • Trans-polymer dispersed liquid crystal material, trans-polymer dispersed liquid crystal light valve and application of light valve
  • Trans-polymer dispersed liquid crystal material, trans-polymer dispersed liquid crystal light valve and application of light valve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0229] Each compound listed in table 2 and percentage by weight are formulated into liquid crystal composition LC-1:

[0230] Table 2 Liquid Crystal Composition LC-1 Formula

[0231] Component code weight percent 3PTWO1 15 3PTWO2 14 5PTWO2 14 3CPTWO1 11 3CPTWO2 11 5CPTWO2 10 3PWO2 6 3C1OWWO2 4 4C1OWWO2 4 5C1OWWO2 4 3C1OWO2 7 total 100

[0232] Self-alignment material: Ⅱ-1(R 11 =-C 3 h 7 , L 1 =L 2 =L 3 =-H, t=m=0, u=v=1);

[0233] Liquid crystal polymerizable monomer: Ⅲg-1(L N =-CH 3 , q1=q2=4);

[0234] Glue: Model SEPDLC-2005 (provided by Taiwan Xin Special Materials Company);

[0235] The above-mentioned LC-1, self-alignment material, liquid crystal polymerizable monomer, and glue were uniformly mixed under yellow light conditions at a mass ratio of 82:3:5:10 to obtain the trans polymer dispersed liquid crystal material, and the reverse The polymer-dispersed liquid crystal mat...

Embodiment 2

[0239] Each compound listed in table 3 and percentage by weight are formulated into liquid crystal composition LC-2:

[0240] Table 3 liquid crystal composition LC-2 formula

[0241]

[0242]

[0243] Self-alignment material: same as Example 1;

[0244] Liquid crystal polymerizable monomer: Ⅲh-1(L N =-CO-OCH 3 , q1=q2=4);

[0245] Glue: Model OP-10 (supplied by Shenzhen Saidis Adhesive Industry Co., Ltd.);

[0246] The above-mentioned LC-2, self-alignment material, liquid crystal polymerizable monomer, and glue were uniformly mixed under yellow light conditions at a mass ratio of 65:3:7:25 to obtain the trans-polymer dispersed liquid crystal material. Formula polymer-dispersed liquid crystal material is then mixed with an appropriate amount of 15 μm spacers at 35°C, and the prepared mixture is filled into PET-ITO film by rolling, and left to stand for 20-30min, so that the mixture in the film forms a self- pairing. Put the PET-ITO film sandwiched with the mixture u...

Embodiment 3

[0248] Each compound listed in table 4 and percentage by weight are formulated into liquid crystal composition LC-3:

[0249] Table 4 Liquid Crystal Composition LC-3 Formula

[0250]

[0251]

[0252] Self-aligning material:

[0253] Liquid crystal polymerizable monomer: same as Example 2;

[0254] Glue: Model UV-200 (provided by Kuer Industrial (Shanghai) Co., Ltd.);

[0255] Mix the above-mentioned LC-3, self-alignment material, liquid crystal polymerizable monomer, and glue in a mass ratio of 60:5:5:30 under yellow light conditions, and then add 2% dichroic dye to the mixture (the The above-mentioned dichroic dyes numbered 1, 6, and 12 are prepared by mixing according to the mass ratio of 3:2:8), stirring and dissolving evenly to obtain the trans polymer dispersed liquid crystal material, and the trans polymer dispersed liquid crystal material Then, an appropriate amount of 10 μm spacers were mixed in under the condition of 35° C., and the prepared mixture was fi...

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Abstract

The invention provides a trans-polymer dispersed liquid crystal material, a trans-polymer dispersed liquid crystal light valve and application of the light valve. The trans-polymer dispersed liquid crystal material comprises the following components: a nematic-phase liquid crystal composition with negative dielectric anisotropy, ultraviolet-curable or thermal-curable glue and a self-alignment material. The trans-polymer dispersed liquid crystal light valve comprises a first base layer, a first conductive layer, a liquid crystal layer, a second conductive layer and a second base layer which arearranged from top to bottom in sequence, and the liquid crystal layer contains the trans-polymer dispersed liquid crystal material. The trans-polymer dispersed liquid crystal material has the advantages of being good in stability, high in steady-state transmittance, large in fog-state haze, excellent in mechanical performance and high in anti-impact performance when applied in an optical switching device.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal applications, and specifically relates to a polymer-dispersed liquid crystal material that is in a light-transmitting state when power is not applied and is in a mist state when power is applied, and its application in optical switching devices. It can be specifically applied to smart windows, transparent Display and other fields. Background technique [0002] Polymer dispersed liquid crystal (PDLC) is a three-dimensional network structure formed by filling liquid crystal molecules in polymers. When no electric field is applied, the directors of liquid crystal molecules are distributed irregularly, and the film is in a state of strong light scattering; Under the action of an electric field, the long axes of the liquid crystal molecules are aligned parallel to the electric field, and the film is transparent. The electro-optical performance characteristics of the trans PDLC film are: when no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/38C09K19/30C09K19/44C09K19/46C09K19/34C09K19/56G02F1/1334G02F1/137
CPCC09K19/3003C09K19/3028C09K19/3059C09K19/3068C09K19/34C09K19/3852C09K19/44C09K19/46C09K19/56C09K2019/3004C09K2019/301C09K2019/303C09K2019/3063G02F1/1334G02F1/137G02F1/13712
Inventor 丁文全周振婷
Owner JIANGSU HECHENG DISPLAY TECHCO
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