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Preparation method of defect-free fast-switching dye-doped cholesteric liquid crystal intelligent window

A cholesteric liquid crystal and fast switching technology is applied in the field of preparation of dye-doped cholesteric liquid crystal smart windows. The effect of eliminating grain defects, eliminating polarization dependence, and improving absorption efficiency

Pending Publication Date: 2022-07-12
SHENZHEN POLICRAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the slow relaxation speed of the cholesteric liquid crystal switching from the vertical state to the planar state in the prior art and the presence of oil streak defects in the planar state, and the proposed defect-free and fast switching dye-doped cholesteric liquid crystal Preparation method of phase liquid crystal smart window

Method used

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  • Preparation method of defect-free fast-switching dye-doped cholesteric liquid crystal intelligent window
  • Preparation method of defect-free fast-switching dye-doped cholesteric liquid crystal intelligent window
  • Preparation method of defect-free fast-switching dye-doped cholesteric liquid crystal intelligent window

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Embodiment 1

[0026] refer to Figure 1-5 , a method for preparing a defect-free fast switching dye-doped cholesteric liquid crystal smart window, the specific steps are as follows:

[0027] Step 1. Select liquid crystal BHR40200, curved liquid crystal CB7CB, chiral agent S811 and dichroic dye, and mix the above raw materials according to the following ratio of 93.5:0:7:3 to form a mixture;

[0028] Step 2. Place the mixture on a hot stage, place the mixture on the hot stage, and stir at a temperature of 90° C. for 20 hours, and then use a pipette to take a small amount of the mixture;

[0029] Step 3, using ODF or capillary action to inject the mixture into a liquid crystal cell with a cell thickness of 10 microns at a temperature of 90° C. through a crystal filling port, and sealing after cooling to obtain a dye-doped cholesteric liquid crystal smart window.

Embodiment 2

[0031] refer to Figure 1-5 , a method for preparing a defect-free fast switching dye-doped cholesteric liquid crystal smart window, the specific steps are as follows:

[0032] Step 1. Select liquid crystal BHR40200, curved liquid crystal CB7CB, chiral agent S811 and dichroic dye, and mix the above raw materials according to the following ratio of 73.5:20:5:1.5 to form a mixture;

[0033] Step 2. Place the mixture on a hot stage, place the mixture on the hot stage, and stir at a temperature of 90° C. for 20 hours, and then use a pipette to take a small amount of the mixture;

[0034] Step 3, using ODF or capillary action to inject the mixture into a liquid crystal cell with a cell thickness of 10 microns at a temperature of 90° C. through a crystal filling port, and sealing after cooling to obtain a dye-doped cholesteric liquid crystal smart window.

Embodiment 3

[0036] refer to Figure 1-5 , a method for preparing a defect-free fast switching dye-doped cholesteric liquid crystal smart window, the specific steps are as follows:

[0037] Step 1. Select liquid crystal BHR40200, curved liquid crystal CB7CB, chiral agent S811 and dichroic dye, and mix the above raw materials according to the following ratio of 70.5:23:5:1.5 to form a mixture;

[0038] Step 2. Place the mixture on the hot stage, place the mixture on the hot stage, and stir at a temperature of 100° C. for 24 hours, and then use a pipette to take a small amount of the mixture;

[0039] Step 3, using ODF or capillary action to inject the mixture into a liquid crystal cell with a cell thickness of 10 microns at a temperature of 100° C. through a crystal filling port, and sealing after cooling to obtain a dye-doped cholesteric liquid crystal smart window.

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Abstract

The invention relates to the technical field of intelligent window preparation, in particular to a preparation method of a defect-free fast-switching dye-doped cholesteric liquid crystal intelligent window, which comprises the following specific steps: step 1, selecting liquid crystal, bent liquid crystal, a chiral agent and dichroic dye, and mixing the raw materials according to the proportion to form a mixture; step 2, placing the mixture on a heating stage, stirring at a certain temperature, and then taking a small amount of the mixture by using a pipettor; and 3, injecting the mixture into a liquid crystal box with the box thickness of 10 microns through a crystal filling opening at the temperature of 90-110 DEG C by utilizing ODF or capillary action, cooling and sealing to obtain the dye-doped cholesteric liquid crystal intelligent window. According to the invention, the conversion of an absorption plane state, an absorption and scattering focal cone state and a transparent vertical state is realized by doping a proper chiral agent, the polarization dependence of the absorption plane state is eliminated, and the absorption efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of preparation of smart windows, in particular to a preparation method of a dye-doped cholesteric liquid crystal smart window with defect-free fast switching. Background technique [0002] Dichroic dye-doped liquid crystal devices have been widely studied due to their fast response and low power consumption, but dichroic dye-doped nematic liquid crystals only strongly absorb light polarized in one direction (parallel or perpendicular to The long axis of the dye molecule), has a strong polarization dependence, and the absorption efficiency is less than 50%. To eliminate polarization dependence, smart windows based on dye-doped cholesteric liquid crystals (DDCLCs) have been proposed, which can realize three-state switching based on electrical responses, namely absorption plane state, absorption and scattering focal conic state, and transparent vertical state. . However, the relaxation rate of cholesteric liq...

Claims

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Application Information

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IPC IPC(8): G02F1/137G02F1/1333
CPCG02F1/13718G02F1/1333
Inventor 陆红波朱蒙蒙夏亮吴飞沈隆军
Owner SHENZHEN POLICRAL TECH CO LTD
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