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Display module is a part to be reckoned with when it comes to power consumption of mobile devices. Display modules usually consume more than 15% of the total power consumption while messaging in application, retouching photos, or playing videos. Therefore, researchers were dedicated to making power-saving mode based on screen features, such as reducing luminance of partial regions, shutting off subpixels, and doing color transformation. Each of the power-saving methods might affect the display effect, resulting in negative user experience. To deal with this problem, we present a method which can make mobile applications more energy-efficient by transforming the colors of the user interface in a bottom-up way, which divides the interface into every element on app layout and decides the color of each of them. This method also keeps user experience by using the feature of human visual salience in the phase of color transformation. With the method, we can rearrange the color of each app element on app layout to be more power-optimized, and simultaneously keep the user attention on modified app layout similar to the original app layout by doing saliency prediction analysis. With OLED mobile devices, this system is able to reduce, on average, between 12% and 35% of the display power consumption when using static mobile applications, which are usually stay on unchanging view. We find that the correlation between the changes of visual saliency distribution and the power saving effect, and base on the correlation, we provide some suggestions for designing power-saving color transformation rules.



視覺注意力, 視覺顯著性, 螢幕省電, 行動裝置, 省電色彩轉換, Human visual attention, Visual saliency, Power-saving on OLED Display, Mobile device, Power-saving color transformation