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Light-dependent control switching method for cholesteric phase liquid crystal fingerprint texture

A cholesteric liquid crystal and fingerprint technology, applied in the liquid crystal field, can solve the problems of high electric field modulation requirements, difficult operation, slow pattern response speed, etc., and achieve the effect of high resolution, easy erasing and high resolution

Inactive Publication Date: 2019-03-19
XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when patterned modulation is performed by this switching method, the requirements for electric field modulation are relatively high, and it is not easy to operate, and it is not easy to achieve high-resolution fingerprint texture patterns.
[0004] Adding a photosensitive chiral agent to the cholesteric liquid crystal can realize the generation of the cholesteric liquid crystal fingerprint texture grating pattern. After exposure treatment, a high-resolution grating pattern can be obtained, but the response speed of the pattern is slow and it is not easy to erase and write. and changes, dynamic changes that cannot achieve fast response

Method used

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  • Light-dependent control switching method for cholesteric phase liquid crystal fingerprint texture
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  • Light-dependent control switching method for cholesteric phase liquid crystal fingerprint texture

Examples

Experimental program
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Effect test

Embodiment 1

[0038] figure 2 It is a parallel alignment cholesteric liquid crystal cell with dual substrates and photoconductive layers in the first embodiment. The liquid crystal cell includes two substrates, an accommodating space for the liquid crystal layer 25 is formed between the two substrates, and the substrates include a matrix layer 21 , a conductive layer 22 , a photoconductive layer 23 and an alignment layer 24 . The alignment layer 24, the photoconductive layer 23, the conductive layer 22 and the matrix layer 21 are sequentially laminated on the outside of the liquid crystal layer 25 from inside to outside, wherein: the matrix layer 21 is made of transparent glass, but other colorless or Colored supporting materials, such as plastic film or plastic plate, etc.; the conductive layer 22 is made of ITO (indium tin oxide), the photoconductive layer 23 is made of ZnO (zinc oxide), and the alignment layer 24 is made of PI (polyimide).

[0039] The liquid crystal layer 25 is locate...

Embodiment 2

[0058] The mixed alignment cholesteric liquid crystal cell of the double substrate containing the photoconductive layer of the second embodiment is as follows image 3 shown. It differs from Example 1 in that:

[0059] The upper substrate of the liquid crystal cell comprises: a matrix layer 31, a conductive layer 32, a photoconductive layer 33 and an alignment layer 34, wherein: the matrix layer 31 is made of transparent glass, the conductive layer 32 is made of ITO, the photoconductive layer 33 is made of ZnO, and the alignment layer 34 is made of PI; the lower substrate includes: a conductive layer 32, a photoconductive layer 37 and an alignment layer 36, wherein: the conductive layer 32 is made of ITO, the photoconductive layer 37 is made of BSO (bismuth silicate) crystal, and the alignment layer 36 is made of DMOAP. The liquid crystal layer 35 is selected from cholesteric liquid crystal. Since the supporting effect of the BSO crystal is relatively obvious, the base layer...

Embodiment 3

[0064] The parallel alignment cholesteric liquid crystal cell of the single substrate of the third embodiment containing a photoconductive layer is as follows: Figure 4 shown. It differs from Embodiment 1 and Embodiment 2 in that:

[0065] The upper substrate of the liquid crystal cell includes: a matrix layer 41 , a conductive layer 42 and an alignment layer 44 , wherein: the matrix layer 41 is made of transparent glass, the conductive layer 42 is made of ITO, and the alignment layer 44 is made of PI. The lower substrate includes: a conductive layer 42 , a photoconductive layer 43 and an alignment layer 44 , wherein: the conductive layer 42 is made of ITO, the photoconductive layer 43 is made of BSO crystal, and the alignment layer 44 is made of PI. The liquid crystal 45 is a cholesteric liquid crystal.

[0066] Because the photoconductive effect of the BSO crystal is relatively obvious, on the basis of Example 2, the photoconductive layer on the other side can be removed....

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Abstract

The invention discloses a cholesteric phase liquid crystal fingerprint texture light-dependent control switching method, which comprises the following steps: (1) preparing a liquid crystal box, wherein the liquid crystal box comprises two substrates, an accommodating space for accommodating a liquid crystal layer is formed between the two substrates, the substrate at least comprises an alignment layer, a photoelectric conductive layer and a conductive layer which are sequentially laminated from the containing space to the outside; (2) injecting cholesteric phase liquid crystal into the containing space of the liquid crystal box prepared in the step (1) to generate a liquid crystal layer of the cholesteric phase liquid crystal; and step (3), placing the liquid crystal box in the step (2) under the condition of the illumination of the photoconductive layer absorbing band's wavelength and the alternating current voltage to carry out the light-dependent control switching of the fingerprinttexture. The method has the advantages that the light-dependent control switching fingerprint texture is flexible and convenient to operate, and can achieve fast response and real-time control light-dependent control switching of the cholesteric phase liquid crystal fingerprint texture.

Description

technical field [0001] The invention relates to the technical field of liquid crystals, in particular to a method for light-controlled switching of fingerprint textures of cholesteric liquid crystals. Background technique [0002] The cholesteric liquid crystal fingerprint texture grating is a phase grating based on the periodic arrangement of cholesteric liquid crystals in the plane, and it is one of the research hotspots in recent years. Due to the periodic refractive index distribution and electronic control tunability of the cholesteric liquid crystal fingerprint texture grating, it can be used in non-mechanical beam steering devices, photolithography masks, brightness enhancement films, and anti-counterfeiting two-dimensional codes. , liquid crystal lasers, particle manipulation, self-cleaning films, etc. Correspondingly, the switching of the fingerprint texture of cholesteric liquid crystals is very necessary. [0003] The traditional liquid crystal cell can be contr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/137G02F1/133G02F1/01
CPCG02F1/0126G02F1/13306G02F1/13718
Inventor 陈鹭剑江荣国李森森沈源
Owner XIAMEN UNIV
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