AMOLED displays have been emerged as a new technology recently but have a significant portion of the total power consumption in mobile devices. In this paper, we propose a novel approach which combines color transformation and dynamic voltage scaling (DVS) synergistically in the aspects of both power saving and visual quality. It adaptively selects an allowable perceptuality and saturation threshold based on the luminance value of an input image, then transforms the colors of image pixels and performs DVS while satisfying human visuality. To implement it, a board interfaced with a mobile AMOLED display module is developed. Experiments show that the proposed approach achieves on average 29.6% power saving for still images with high satisfaction to human visuality.

In this paper, a novel approach, which combines color transformation and dimming synergistically with respect to both power saving and image quality, is proposed for thin film transistor liquid crystal displays (TFT LCDs). This approach adaptively selects an allowable perceptual value that depends on the luminance value of an image (or frame) and dims the backlight based on it. The technique is implemented using an image viewer and a video playback program on an LED backlight unit-based TFT LCD board. Experimental results show that the proposed approach achieves on average 34.5% and 21.19% power savings for still images and video files, respectively, without affecting the visual quality of the images and with an overhead of 4.09% for video files.

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