Effects of Illumination Color, Screen Text/Background Color Combination andChinese Character Complexity on Character legibility and Visual Fatigue
This study simulated the illuminated condition of photolithography in semi-conductor factory to investigate the performance on Chinese character legibility and the effects of visual fatigue for subjects on VDT. The independent variables are the light color, the screen text/background color combination, and the complexity of characters in this experiment. The variable of light color has two levels that were yellow and white. The variable of screen text/background color combination has four types that were black text on white background, white text on black background, red text on green background, and white text on yellow background. The variable of complexity of characters has three levels that were low, middle, and high. Results showed that the subjects' Chinese character legible time of targets found and correct percentage for white text on yellow background and high complexity of characters was significantly poorer than for the other conditions. Visual fatigue was measured by the change of critical fusion frequency (C.F.F.) had no significant effect. The subjects' subjective measurement significantly showed visual fatigue in the photolithography in semi-conductor factory. And the subjects indicated they dislike VDT work in the photolithography in semi-conductor factory.