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Research and Improvement of viewing angle characteristics of liquid crystal displays

Author: WangXueJun
Tutor: LuYaXiong
School: University of Electronic Science and Technology
Course: Optical Engineering
Keywords: TN-LCD Difference iterative method The director Berreman's 4 × 4 matrix method Viewing angle characteristics Transmittance
CLC: TN873.93
Type: Master's thesis
Year: 2008
Downloads: 403
Quote: 1
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Abstract


LCD as most mainstream flat-panel display technology, and its applications are more and more widely. Since the birth of the first liquid crystal display, the people have been working to improve the study of the liquid crystal device performance. Although LCD performance has been basically meet the use requirements, but the the \This major work undertaken using a 1/4 wave plate in place of the compensation film to improve LCD viewing angle, the TN-LCD (Twisted Nematic Liquid Crystal Display) liquid crystal display mode of the electro-optic characteristics and viewing angle characteristics were studied. First in elastomers theory based on the establishment of the the LCD system outside equilibrium free energy density in the field under partial differential equations, and then take advantage of the quick and effective difference iterative method for solving partial differential equations to obtain the distribution field in the the LCD system molecular director outfield under given the establishment and the derivation of the differential equation. Liquid crystal molecules with the external field director distribution Berreman's4 × 4 matrix method, the liquid crystal cell system including a polarizer and glass layer is divided into N 4 layer, which polarizer Jones matrix, each layer with Berreman 'S4 × 4 matrix to describe. N 4 matrix to obtain the intensity of the outgoing light, the incident light layers role in different incident directions can be obtained, i.e., different viewing angle range, the strength after the incident light through the liquid crystal cell, thereby draw the viewing angle characteristics of the liquid crystal display. TN-LCD, for example in order to ensure the correctness of the method and procedures, calculated director distribution curves and viewing angle characteristics of transmittance curve. Conventional LCD parameter measurements are generally separate measurement of the thickness of the liquid crystal cell and the twist angle, the paper uses an optical way by simultaneously measuring the thickness of the twisted nematic liquid crystal twist angle and a liquid crystal cell was first proposed in the twist angle of 0 ~ 360 unknown circumstances, can determine the same liquid crystal chiral direction and director direction, experimental TN-LCD cell, for example, measured in the cell thickness d = 6.1um and distortions angle φ0 - = 91.5. The thickness of the liquid crystal cell with such a measurement error is within 1%, the measurement of the twist angle and the directional vector direction angle error in the 1 range. The paper analyzes the principle of generation of the LCD viewing angle problems, summarizes a variety of techniques to improve the viewing angle problem, analyzing the works of the 1/4 wave plate to improve the LCD viewing angle, have to establish the liquid crystal electro-optical properties of simulation software based on established LCD wide viewing angle film automatic design and optimization procedures. Finally, using a 1/4 wave plate, the transmittance of the TN-type liquid crystal cell before and after compensation of comparison, experimental results show that the 1/4 wave plate can greatly increase the viewing angle characteristics of the liquid crystal display device, changing the liquid crystal display viewing angle asymmetry sex. Finally, this paper made a comprehensive summary and recommendations for future work.

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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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