The effect of FLCoS-display hold time on the perceived blur of moving imagery

• Published in: Journal of the Society for Information Display 2007-01, Vol.15 (1), p.87-91
• Main Authors: Geri, George A., Morgan, William D.
• Format: Article
• Language: English
• Subjects: FLCoS display; FLCoS hold time; perceptual assessment; Temporal response
• ISSN: 1071-0922; 1938-3657
• DOI: 10.1889/1.2451573

— The on‐ and off‐times of LCDs have decreased significantly over the past few years. However, long hold times, while increasing light output, have limited the temporal resolution of these devices. We have varied hold time and used a perceptual technique to assess the resulting change in blur of a moving test target presented on an FLCoS display. The technique requires observers to adjust the gap between two vertical lines that move across the display at various speeds. It was found that for a 13.4‐msec hold time, the threshold gap width, and thus by implication the perceived blur, increased significantly from about 3 to 22 pixels as line speed was increased. For hold times of 8, 6, 4, and 2 msec, threshold gap width remained approximately constant at between about 2 and 5 pixels as line speed was increased. The results of the perceptual test used here suggest that reducing FLCoS hold time to 8 msec significantly improves the quality of moving imagery. Further, decreasing the hold time to 2 msec results in perceptual blur that extends over as little as 6 arc‐minutes.