2001 Fiscal Year Final Research Report Summary
Evaluation method of viewing angle characteristics for any types of LCDs
| Project/Area Number |
12650422
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Measurement engineering
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| Research Institution | Shizuoka University |
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Principal Investigator |
SHIMODAIRA Yoshifumi Shizuoka Univ., Faculty of Eng., Professor, 工学部, 教授 (30022247)
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| Co-Investigator(Kenkyū-buntansha) |
OHASHI Gosuke Shizuoka Univ., Faculty of Eng., Res. Associate, 工学部, 助手 (80293603)
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| Project Period (FY) |
2000 – 2001
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| Keywords | Liquid Crystal Display / Overall picture quality / Viewing Angle characteristics / Gamma / Luminance / Saturation |
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| Research Abstract |
Evaluation method of overall picture quality for viewing angle characteristics was obtained by the following experimental procedures and proposed.
1. Optical characteristics of various Liquid Crystal Displays (LCD) were measured at every viewing angle. Using these parameters, evaluation images were reproduced on the monitor CRT by simulation techniques. Overall picture quality were directory measured on those evaluation images. The measured values were assigned as standards of overall picture quality.
2. Estimation of overall picture quality is based on the model ofimpairment summation of picture quality. It is known that impairment factors of picture quality are changes of luminance, contrast, gamma and color. Affection of those factors on picture quality was further taking into consideration. As the results, dominant factors of maximum and minimum luminance, gamma, saturation and hue were extracted. In addition, relationship between minimum luminance and gamma on picture quality was examined by the subjective experiment. Quantitative relation was reduced through the experiment. On the phenomenon of color change, it was found that saturation change was dominant factor in comparison with hue change. Therefore, the component of saturation was first subtracted and the residual component was assigned as hue change on the phenomenon of color change.
After analysis of these factors, the factors were adopted as ones of the estimation model of overall picture quality. The overall picture quality estimated by the proposed method shewd good agreement with the standard of overall picture quality obtained by the method of 1. Users of LCDs can easily select their suitable ones when characteristics of LCDs are shown by overall picture quality estimated by the proposed method.
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