標題: | CSD-A New Unified Threshold Metric of Evaluating LCD Viewing Angle by Color Saturation Degradation |
作者: | Chen, Szu-Fen F. Cheng, Wei-Chung W. Shieh, Han-Ping D. 光電工程學系 顯示科技研究所 Department of Photonics Institute of Display |
關鍵字: | Color saturation degradation (CSD) metric;contrast ratio metric;just-noticeable difference (JND);liquid-crystal device (LCD) viewing angle evaluation;psychophysical evaluation |
公開日期: | 1-六月-2006 |
摘要: | Lower luminance contrast ratio and chromatic changes affect the visual performance (i.e. color shift) of a thin-film transistor liquid-crystal device (TFT-LCD) at large viewing angles. The de facto method of defining viewing angle, contrast ratio of luminance, fails to represent the substantial visual performance viewed at a larger angle. We found the degradation of color saturation, dS*/d theta, to be an appropriate metric to aid the conventional viewing angle definition (CR >= 0). We empirically determined the threshold for defining the color viewing angles of TFT-LCDs, CVA = {theta parallel to dS*/d theta vertical bar <= 0.03} which reflects the variation not only in chromaticity but also in luminance. The proposed metric was evaluated by psychophysical experiments, whose results validate the efficacy of the proposed metric. |
URI: | http://dx.doi.org/10.1109/JDT.2006.874504 http://hdl.handle.net/11536/12206 |
ISSN: | 1551-319X |
DOI: | 10.1109/JDT.2006.874504 |
期刊: | JOURNAL OF DISPLAY TECHNOLOGY |
Volume: | 2 |
Issue: | 2 |
起始頁: | 106 |
結束頁: | 113 |
顯示於類別: | 期刊論文 |