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The photoelectric properties of encapsulated cholesteric liquid crystal films on different substrates

Author: CaiLinJun
Tutor: YanZhuJun
School: Fudan University
Course: Materials Engineering
Keywords: cholesteric liquid crystal flexible display encapsulation PIPS
CLC: TN873.93
Type: Master's thesis
Year: 2012
Downloads: 41
Quote: 0
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Abstract


The reflective cholesteric liquid crystal display (Ch-LCD) is a new kind of remarkable reflective display developing in recent years. It is realized by the contrast state between Bragg reflective bright state of Planar texture and scattered dark state of Focal Conic texture. The most impressive characteristic of Ch-LCD is the bi-stable state under zero field which induces the reflective display of less power loss. People put more and more attention on this display because it does not need polarizer, is readable in the sunshine, and can also be made on the flexible substrate which is suitable for E-paper application.This paper initially completed the preparation process of the liquid crystal (LC) cells made on two different substrates, and on the basis of the completion of the cholesteric glass LC cell production, explored the preparation of cholesteric flexible LC cell, focusing on the cell thickness control and LC filling process, and determined the process parameters, which lays a good foundation for the further study of flexible reflective Ch-LCD.In order to solve the liquidity problems of traditional LCD in the flexible process, polymerization induced phase separation (PIPS) method was used to encapsulate the LC molecules. And with photo-mask the regular box array-type encapsulated LC film was prepared by the means of patterned polymerization. The influence of the polymer precursor formulation and LC polymer ratio on the LC encapsulation has been studied in detail, and the light polymerization conditions have been also studied.On the basis of thoroughly study of reflective Ch-LCD principle, the electro-optical properties of cholesteric LC cell on the rigid glass substrate and flexible plastic substrate has been systematic studied, mainly on the influence of different substrates and cell thickness to the drive voltage, reflectivity and contrast ratio. It shows that no matter on glass or plastic substrate, the encapsulation contributes to improve the display contrast, though the driving voltage accordingly increases.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Terminal equipment > Display device,the display > LCD monitors
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