Method for preparing LCD polarized sheet with wide wave reflection characteristic

A technology of wave reflection and polarizer, which is applied in the field of preparation of liquid crystal polarizers with broad wave reflection characteristics, can solve problems such as difficult control and complicated process, and achieve the effects of low production cost, simple production process and high transmittance

Inactive Publication Date: 2008-10-08
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a broadband reflective liquid crystal polarizer. Through a simple process, a liquid crystal polarizer capable of wide-wave reflection is prepared, which overcomes the disadvantages that the process is relatively complicated and difficult to control.

Method used

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  • Method for preparing LCD polarized sheet with wide wave reflection characteristic
  • Method for preparing LCD polarized sheet with wide wave reflection characteristic
  • Method for preparing LCD polarized sheet with wide wave reflection characteristic

Examples

Experimental program
Comparison scheme
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example 1

[0028] E7 from Merck Company was used as the nematic liquid crystal, and CB15 was used as the chiral compound. Here, the content of CB15 is selected to be 15wt%, and the reflection band of the cholesteric liquid crystal is 1500-1700 nm. In the formed cholesteric liquid crystal, add 5wt% polymerizable monomer A ( figure 1 ), the photoinitiator adopts 651, and the content is 5.0wt% of the total mass of monomers. The balance is nematic liquid crystal, the mixture is poured into a liquid crystal cell with a cell thickness of 30 μm and antiparallel, and the liquid crystal is in the state of planar texture, using 365nm, 0.1mW / cm 2 The ultraviolet light was irradiated at 5°C for 5 hours, the reflection band increased to 1000-1800nm, and the reflection of about 800nm ​​band was realized, and the transmission spectrum was as follows: image 3 As shown, the network morphology of the polymer in the system is as follows Figure 5 shown.

example 2

[0030] The nematic phase liquid crystal that uses is the SLC-1717 of Slichem Company, and the bifunctional monomer is compound A ( figure 1 ), the chiral monofunctional monomer selects M1 ( figure 2, n=2, the chiral unit is cholesterol), and the whole system is a left-handed helical pitch. The specific ratio is as follows: the content of chiral compound S811 is 15wt%, the content of monomer A is 5wt%, the content of chiral monofunctional monomer M1 is 10wt%, the photoinitiator is 651, and the content is 5.0wt% of the total mass of monomers , the balance is nematic liquid crystal, and the thickness of the liquid crystal cell is 25 μm. At 55°C, 365nm (0.9mw / cm 2 ) under UV conditions for 30 minutes. The reflected waveband ranges from 586 to 782nm, and the reflection bandwidth is about 200nm. The spectrum is as follows Figure 4 as shown, Image 6 It is a model diagram of the distribution of components in the mixed system after polymerization.

example 3

[0032] The nematic liquid crystal used is Merck E7, compound A is used as the difunctional monomer, M2 (n=6, chiral unit is R2) is used as the chiral monofunctional monomer, and general 184 is used as the photoinitiator. The whole system is a right-hand pitch. The content of each component in the system is as follows: the content of chiral compound CB15 is 20.5wt%, the content of monomer A is 5.0wt%, the content of M2 is 8.0wt%, the photoinitiator is 651, and the content is 5.0wt% of the total mass of the monomer %, the balance is nematic liquid crystal, and the thickness of the liquid crystal cell is 25 μm. At 25°C, 365nm (1.5mw / cm 2 ) under UV conditions for 30 minutes. The reflected wavelength range is 750-1400nm, and the reflection bandwidth is 650nm.

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Abstract

The present invention provides a preparing method of liquid crystal polarizing sheet with broad wave reflection characteristic, pertaining to the liquid crystal material application and correlation technique field. Small molecule nematic phase liquid crystal, chiral polymerisable simple function group monomer, chiral compound, chiral or non-chiral polymerisable double functional group monomer, photo-initiation agent, polymerization inhibitor, and the like are homogeneously mixed to inject in a liquid crystal box whose interior surface has an inverse parallel orientation process; the liquid crystal is at a cholesteric liquid crystal plane textile state, to execute ultraviolet irradiation, thereby the light polymerisable monomers are cross linked into a polymer network, the screw pitch of the cholesteric liquid crystals are in a gradient distribution, so that the liquid crystal polarizing sheet with broad wave reflection characteristic can be obtained. The present invention can realize the liquid crystal polarizing sheet with broad wave reflection band, and the reflection area can be arbitrarily regulated according to the content of the chiral compound and the chiral polymerisable monomer; the optical quality can be reciprocally changed between the transparent state and the dispersion state with broad wave reflection characteristic; the polarizing sheet has simple preparing technique and low cost.

Description

technical field [0001] The invention belongs to the field of liquid crystal material application and related technologies, and in particular relates to a preparation method of a liquid crystal polarizer with broadband reflection characteristics, so that cholesteric liquid crystals can realize broadband reflection. Background technique [0002] The polarizer widely used in liquid crystal displays is an absorbing polarizer developed in the 1920s. Although this type of polarizer is cheap, it still has many shortcomings and deficiencies, such as large light loss and limited working environment. Reflective polarizers have broad application prospects due to their excellent performance. Such polarizers, developed from liquid crystal composites with cholesteric order, have immediate applications such as light enhancement films for liquid crystal displays, switchable energy-saving / privacy windows, and energy-efficient reflective coatings. [0003] As we all know, cholesteric liquid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30
Inventor 杨槐郭金宝李克轩何思敏孙婕刘芳程紫辉张立培曹晖
Owner UNIV OF SCI & TECH BEIJING
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