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Liquid crystal thin film and preparation method thereof, temperature response apparatus and circular polarizer

A technology of liquid crystal film and cholesteric liquid crystal, which is applied to liquid crystal materials, polarizing elements, chemical instruments and methods, etc., can solve the problems of optical performance influence, difficult process control, difficult electrode processing, etc., and achieves low cost and simple preparation process. , the effect of a wide reflection area

Active Publication Date: 2014-09-17
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it needs to introduce special shaped electrodes into the reflective film to affect its optical properties, and such electrodes are also difficult to process
Since the degree of diffusion of monomers in liquid crystals is related to the intensity of ultraviolet rays, the bandwidth formed by this method is very sensitive to the intensity of ultraviolet radiation. During the manufacturing process, a monochromatic light sensor is used to detect the polarizer. Once the required bandwidth is reached , it is necessary to immediately increase the intensity of ultraviolet irradiation. It can be seen that the equipment required for this method is more complicated and the process is more difficult to control.

Method used

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  • Liquid crystal thin film and preparation method thereof, temperature response apparatus and circular polarizer
  • Liquid crystal thin film and preparation method thereof, temperature response apparatus and circular polarizer
  • Liquid crystal thin film and preparation method thereof, temperature response apparatus and circular polarizer

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Example 1 Preparation of liquid crystal film with broadband reflection characteristics at room temperature

[0040] 1) Preparation of cholesteric liquid crystal: chiral liquid crystal polymerizable monomer Ch1 (0.0632g), small molecule nematic liquid crystal SLC1717 (0.1174g), chiral additive 5CBB (0.0296g), chiral additive ZLI- 4572 (0.012g) and photoinitiator Irg651 (Irgacure651) (0.001g) were thoroughly mixed and prepared by solvent evaporation method;

[0041] 2) Adding hydrogen bond acceptor CBS (0.01442g) and hydrogen bond donor CHG (0.02558g) to the cholesteric liquid crystal obtained in step 1) to form a complex system, which has a P1 pitch at room temperature;

[0042] Step 1), step 2) described components are as follows:

[0043]

[0044] 3) Perform variable temperature infrared tests on the composite system, such as figure 2 As shown, the hydrogen bond breaking temperature in the composite system is determined to be 220°C (T1); the composite system is t...

Embodiment 2

[0048] Example 2 Preparation of liquid crystal film with broadband reflection characteristics at room temperature

[0049] According to the method of Example 1, a liquid crystal film with broadband reflection characteristics at room temperature was prepared. The difference is that in step 1), the cholesteric liquid crystal is prepared from the following components: chiral liquid crystal polymerizable monomer Ch1 (0.0562g), small molecule nematic liquid crystal SLC1717 (0.1286g), chiral additive CB15 ( 0.005g), chiral additive ZLI-4571 (0.007g) and photoinitiator Irg651 (0.0015g).

[0050] In step 2), hydrogen bond acceptor CBS (0.01084g) and hydrogen bond donor YXG (0.00916g).

[0051] In step 3), the hydrogen bond breaking temperature is 200°C;

[0052] In step 4), the irradiation intensity is 365nm, 2mW / cm 2 ; The irradiation time is 25 minutes; the temperature of the liquid crystal cell is lowered to room temperature to obtain a liquid crystal film with a reflection wave...

Embodiment 3

[0053] Example 3 Preparation of liquid crystal film with broadband reflection characteristics at room temperature

[0054] According to the method of Example 1, a liquid crystal film with broadband reflection characteristics at room temperature was prepared. The difference is that in step 1), the cholesteric liquid crystal is prepared from the following components: chiral liquid crystal polymerizable monomer Ch1 (0.0362g), small molecule nematic liquid crystal SLC1717 (0.0592g), chiral additive 5CBB ( 0.0148g), chiral additive ZLI-4572 (0.006g) and photoinitiator Irg651 (0.0015g).

[0055] In step 2), hydrogen bond acceptor BTS (0.007874g) and hydrogen bond donor YXG (0.012126g).

[0056] In step 3), the hydrogen bond breaking temperature is 240°C;

[0057] In step 4), the irradiation intensity is 365nm, 3.3mW / cm 2 ; The irradiation time is 18 minutes; the temperature of the liquid crystal cell is lowered to room temperature to obtain a liquid crystal film with a reflection...

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Abstract

The invention relates to a liquid crystal thin film which is obtained by mixing a cholesteric liquid crystal and a hydrogen bond self-assembled chiral material to form a compound system and then irradiating by ultraviolet light to polymerize. The invention further relates to a preparation method and special applications of the liquid crystal thin film. The liquid crystal thin film provided by the invention is wide in raw material source, low in cost and simple in preparation process, the requirement on intensity control of ultraviolet light is reduced, and the film can be produced in a large area. The liquid crystal thin film obtained has high reflectivity and transmittance as well as a wide reflective region.

Description

technical field [0001] The invention relates to a liquid crystal film, a preparation method thereof, a temperature response device and a circular polarizer, and belongs to the technical field of liquid crystal display. Background technique [0002] Cholesteric liquid crystals can be obtained by doping chiral additives in nematic liquid crystals. In cholesteric liquid crystals, the long axes of liquid crystal molecules rotate periodically around the helical axis to form a helical structure. The distance through which the long axis of the liquid crystal molecule rotates 360 degrees is called the pitch P, and the size of P is inversely proportional to the content of the chiral additive in the liquid crystal. Cholesteric liquid crystals have the optical property of selective Bragg reflection due to this special helical structure. The cholesteric liquid crystal with a single pitch can reflect the reflection wavelength of incident light Δλ=ΔnP, where Δn is the birefringence inde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/38C08F122/20C08F2/48G02F1/137G02F1/1333G02B5/30
CPCC09K19/50C09K19/2021C09K19/36C09K19/52C09K19/586C09K19/588C09K19/601C09K2019/0448C09K2019/0492C09K2019/2035C09K2019/2042C09K2019/2078C09K2019/323C09K2219/03G02F1/132
Inventor 王菲菲邵喜斌王丹李承珉张洪林
Owner BOE TECH GRP CO LTD
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