PDLCの電気光学特性

概要

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Liquid crystal display devices by TN, STN, and TFT methods have been widely used for note type computers, TV set, measuring instruments, and others. The author has investigated the electro-optical characteristics of liquid crystal cells by PDLC (polymer dispersed liquid crystal) method. PDLC cells were made by changing the mixing ratio of polymer and nematic liquid crystal, the cell thickness and the irradiated time of ultra violet rays. Electro-optical characteristics of PDLC cells were investigated on the TV, the response time and the cell thickness charactenistics by applying the sine wave voltage of 1 KHz from 0 to 40 Vrms. Experimental results showed that the cell with the mixing ratio of 1:3:4 (plc1:bl01:bl36) has higher contrast and the sharpest characteristics on the T-V characteristics, and the cell with the irradiated time of 400 seconds had high contrast and good characteristics compared with the cells having the irradiated times of 100 and 1000 seconds. The response time was the 60~90 mS for all cells. The cells with thin film had the higher contrast ratio than the cells with thick film.
2000-08-29