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This study explored the effects of characteristics of TV program subtitle, including character font, character size, and position of the subtitle on preferred viewing distance and subjective preference for liquid crystal display high-definition television (LCD-HDTV). The results showed the mean preferred viewing distance was 3516 mm, about 4.3 times of television width. Character font had significant effect on PVD; PVD was longer for New Xi-Ming style than Biao Kai style. Character size had significant effect on PVD: the larger the character size, the longer the PVD. Character font had no significant effect on subjective preference. The effect of character size on subjective preference was significant. Subjective preference increased as character size increased from 10 pt, 20 pt to 30 pt, then it decreased when character size was 40 pt. Subtitle position had no significant effect on PVD and subjective preference.

This study explored the effect of screen luminance, subtitle, and viewing angle on preferred viewing distance for liquid crystal display high-definition television (LCD-HDTV). The results showed the mean preferred viewing distance was 3246 mm, about 4 times of television width. Preferred viewing distance increased as the scale of screen luminance went upward from scale 10 to scale 60, then decreased from scale 60 to scale 90. Whether there was subtitle or not did not have significant effect on viewing distance. Moreover, viewing angle was highly correlated with preferred viewing distance. The more deflected from the direct front view, the shorter the viewing distance was.

This study investigated the effects of chromaticity and luminance on legibility and subjective preference for imagery presented on LCD. The results showed that chromaticity and luminance had little effect on legibility speed. Both chromaticity and luminance significantly affected subjective preference. Chromaticity seemed to be more important than luminance for subjective preference. Participants appeared to prefer medium luminance, they also showed less preference for achromatic imagery. Regression equations for legibility speed and subjective preference were constructed. Correlation analysis showed that the equations were better than Lippert's ?GE (CIE Y, u', v').