dc.description.abstract | Recent trend in displays includes increasing size, light weight, super thin, and small smart-phone applications. Additional to above features, accurate color reproduction is also highly desired. In fact, the ability for truthful color reproduction is a major measure to evaluate the quality of displays. More recently, multi-primary color (MPC) displays is becoming a development trend. This provides a larger color gamut than the three primary displays. The present thesis proposes a general color gamut boundary (CGB) theory of an additive multi-primary color system based on color mixing theory. This approach can determine the CGB by its apexes in CIExyY space. After determining the xyY coordinates of the three or multiple primaries, the extremes of CGB can be automatically obtained. This study also proposes methods to construct a uniform CGB under extraneous light conditions, including device leakage light and ambient light. These methods of constructing the CGB only require the chromaticity coordinates and brightness of the primaries and extraneous light. In this study, the average color difference between CGB measurement and simulation in CIELAB is approximately 1 unit, which is considered to be highly satisfactory. This study also proposes a transform of white point while keeping the optimal brightness efficiency for both display and lighting applications. Finally, a concept to determine the optimal brightness of white point conversion on the isotemperature line was developed.
In summary, the proposed approach can not only be used as a standard method for defining CGB, but also be applied into relevant color research such as display and LED lighting design. Practical applications of this approach include the design of MPC displays in color volume, white point, etc, or similarly for MPC lighting. It also could have future impact on the development of color distribution index, detection of cross-talk characteristics of display, or extending the usage of color appearance models.
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