High fidelity color reproduction of plasma displays under ambient lighting

This paper proposes a method of color reproduction that considers the observer´s viewing conditions and characteristics of a PDP display. In general, ambient lighting requires compensation to provide the same visual perception when the temporal and spatial conditions change. In a conventional method, the image contrast and saturation are enhanced by controlling the voltage gain in each channel to consider the phenomenon of human adaptation. Yet, this method encounters difficulties in reproducing the perceived stimulus under a variety of viewing conditions. Accordingly, this study characterizes a PDP display based on the white point when considering the average picture level of the PDP display as the maximum luminance value of a PDP display varies according to the average picture level. Next, to consider the viewing conditions, information on the ambient lighting is obtained using a sensor. The flare, the reflected ambient lighting, is also eliminated on the surface of the PDP display. Finally, the color values are calculated using a modified chromatic adaptation model. In experiments, images reproduced using the proposed method were visually superior to those reproduced using a conventional method.