| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2006: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2005: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2004: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Research Abstract |
(1) In the case of multi color display systems under ambient light conditions such as automotive multicolor display systems, in which emissive display devices are widely used, the legibility of displayed images deteriorates as a result of changes in the ambient illuminance conditions, even though each displayed image is set at the same luminance level based on a consideration of spectral luminous efficiency. This deterioration is strongly dependent on colors, and is referred to in this paper as the "perception of inequality".
(2) The "perception of inequality" mainly stems from spatial frequency characteristics of colors, when the luminance of displayed images is comparatively low. In the process of designing automotive display systems, it is necessary to take into account the size or fineness of the displayed images and what kinds colors are used consistently.
(3) When the luminance of displayed images is comparatively high, the "perception of inequality" stems from not only the spatial
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frequency characteristics of colors, but also the chromaticity threshold at CIE chromatic coordinates between the on-and off-segments of the displayed images illuminated by external light. The latter factor is strongly dependent on the color of the displayed images themselves and the off-segments of the displayed images illuminated by external light. Consequently, the dependencies result in the "perception of inequality", in terms of the luminance intensity of each displayed image.
(4) These relations can be described in a three-dimensional scheme, using the luminance intensity of the off-segments of the displayed images illuminated by external light, spatial frequency characteristics of colors, and difference threshold of luminance intensity of colored displayed images as three axes to express the factors causing the "perception of inequality". This scheme suggests a systematic explanation of the relations among spectral luminous efficiency, fineness of displayed images, and resistance to "washout" in the "perception of inequality" phenomenon. Less
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