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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.