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Study on the way of the doped liquid crystal cell and characteristics

Author: ZhangRuiLi
Tutor: HuangZiQiang
School: University of Electronic Science and Technology
Course: Optical Engineering
Keywords: distorted arrangement GH-LCD DGH-LCD PCGH-LCD electro-opticalproperties
CLC: TN873
Type: Master's thesis
Year: 2012
Downloads: 15
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Abstract

LCD is the main carrier of electronic information in the modern society, especially when the smart phones and3D display appear. People’s lives and production methods are changed and affected by LCD, and the development demand liquid crystal display improvement and looking for the new entry point. The paper researches on the GH LCD displaying without polarizer. The paper analsizes and researches on the electro-optical characteristic of the distorted arrangement DGH-LCD and PCGH-LCD. The display is based on the theory of continuous elastic and optical waveguide effect.1. The curve of the transmittance and voltage, can be got from the theory and the Berreman matrix4×4, with the horizontal viewing angle in the range of about60°The Maxwell equations can deduce the matrix; Build the measurement platform on the electro-optical properties and the self-made auxiliary instrument, systematical introduction to the display unit of production steps, and the preparation of the guest and host liquid crystal mixture; the cell thickness of display units, along the parallel and orthogonal orientation is6μm. The orthogonal orientation of the electro-optical curves is ideal, analyzing on the parameters of threshold voltage and contrast so on.2. The distortion arrangement GH display has the electro-optical curves with the display cell thickness6μm、9μm and11μm. The display cell, along with9μm thickness and orthogonal orientation, has the threshold voltage of4.6V in the range of30horizontal viewing angles. The contrast is about24:1with polarizer of the orthogonal, and the contrast is about2:1without polarizer. The left perspective is wider than the right.3. DGH display mode has the ratio of1:1, with guest and host liquid crystal and C70. The empty box on the influence of the electro-optical properties can be ignored with the increasing of the voltage, and the contrast of double display unit is about twice than the single unit.4. The guest and host liquid crystal display is added the right-handed chiral agents CB15and R1011, with the ratio of about1wt、2wt%、3wt%、4wt%and5wt%. It gets the phase change liquid crystal display. The display cell of the orthogonal orientation and the cell thickness of7um, has the phenomenon of hysteresis effect or bistable state. With the increase of the chiral agents, the pitch makes decrescent, the threshold voltage becomes larger, and the contrast is the largest of the ratio3wt%. The guest and host liquid crystal doping with the chiral agent R1011, perfuse the display unit with twist angle for30°and90°. At the ratio of3wt%as an example, the twist angle is greater, the smaller pitch, the higher threshold voltage, lower contrast and wider hysteresis width, with the same ratio.

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