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Legibility of VDT using LCD was evaluated compared with the VDT using CRT. The display luminance , contrast and chromaticity of the color LCD and CRT were examined under the different illumination. The LCD with back lighting system, which was used in emissive mode like CRT, showed less washedout and better legibility than the CRT under high lighting condition. The LCD with the display luminance of only 120cd/m2 in white was readable under high lighting condition of 1 lx. The variation of the display contrast and chromaticity was less than CRT , when the luminous intensity was changed. These were due to the lower diffusive reflectance of LCD compared with CRT . The variation of the display contrast was dependent on the diffusive reflectance of light shield mask , which was formed in the color filter of the LCD panel. It was concluded that the variation of the contrast was expected to be more improved using the mask with lower diffusive reflectance, which was made of zelatin insted of chromium . It was declared that the LCD was suitable for the use under the bad lighting environment, i.e. for outdoor use.

Effects of Illumination on the Display Quality of VDT