Multi-Histogram-Based Backlight Dimming for Low Power Liquid Crystal Displays

Abstract

This paper presents a new method for dynamic backlight dimming that uses multiple histograms for liquid crystal display (LCD) devices. The proposed multi-histogram-based gray-level error control (MGEC) algorithm considers the pixel distribution of an image using multiple histograms, thereby improving the image quality. Additionally, we propose several techniques to reduce the computational cost of the MGEC algorithm. In the experimental results, the average peak signal-to-noise ratio (PSNR) of the proposed method was improved by up to 8.144 dB compared to that of the benchmark method, while the power consumption was reduced substantially. In addition, when we applied the proposed techniques to reduce the computational cost of the MGEC algorithm, the computation time was reduced by up to 95.801% compared to that of the original algorithm.