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Novel LCD digital analog unit and verification

Author: YuNan
Tutor: HuangZiQiang
School: University of Electronic Science and Technology
Course: Optical Engineering
Keywords: SBTN finite-difference iterative method Berreman’s4×4matrix reflectivity perspective
CLC: TN873
Type: Master's thesis
Year: 2012
Downloads: 12
Quote: 0
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Abstract


Twisted nematic mode (TN-mode) liquid crystal display (LCD), as is well known, can show the image well. Sub-twisted nematic mode (SBTN-mode) LCD can also show high quality image, because it presents the similar electro-optical characteristic curve as the TN-mode LCD.Contrast-viewing angle is an important parameter for the LCD. The electro-optical characteristic of the LCD with azimuth of55°and incidence of0°has been investigated in previous work. Here, we study the contrast-viewing angle of the LCD, while the azimuth and incidence are arbitrary degree so as to obtain the most perspective.According to the continuous elastic theory, difference iterative method and the Berreman4×4matrix method, the director distribution and transmission (reflectivity) of the liquid crystal are calculated. In order to make the calculation simple and convenient, Visual C++is used in this paper. The results can be concluded as follows:1. The software can be well utilized to transmission and reflectivity type LCD. The director distribution and transmission of the TN-mode LCD have been calculated based on numerical and experimental results of previous researchers, so as to validate accuracy of the transmission type LCD based on the software. The director distribution and transmission of the reflectivity type LCD have also been validated by employing the software, using the numerical and experimental results of the SBTN-mode while the azimuth is55°and the incidence is0°.2. By optimizing the azimuth and incidence, it is obtained that the contrast is larger than5while the viewing angle is varied from-85°to85°in the visible wavelength range. The optimized parameters are given as:And=0.19, γ=0°, the azimuth=75°. Moreover, when the azimuth is chosen to range from65°to90°, and And and p0are chosen properly, wide prospective can also be obtained.3. Due to the condition limitation at our lab, electro-optical and the contrast- viewing angle characteristics have been measured in the case that the azimuth is chosen to be90°,75°, and60°. The measurements are progressed by two systems:optical line array phase detection system and the liquid crystal electro-optical effect comprehensive test instrument. On one hand, when the azimuth is90°and75°, the contrasts are not good enough, due to that the phase parameters are not the best value. These experimental results agree well with the theoretical calculation that the image can’t be obtained clearly. On the other hand, for the azimuth of60°, the experimental and theoretical calculation of the electro-optical and contrast-viewing angle characteristic curves are improved, because the main parameters (such as polarization angle, the phase delay) meet the optimum values (or near optimum levels). The image can be realized clearly at the viewing angle from-35°to35°in our daily life.

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