White LED Backlight Control for Motion Blur Reduction and Power Minimization in Large LCD TVs

A 1-D LED backlight scanning and a 2-D local dimming technique for large LCD TVs are presented. These techniques not only reduce the motion blur artifacts by means of impulse representation of images in video but also increase the static contrast ratio by means of local dimming in the image(s). Both techniques exploit a unique feature of LED backlight in large LCD TVs in which the whole panel is divided into a pre-defined number of regions such that the luminance in each region is independently controllable. The proposed techniques are implemented in a Xilinx FPGA and demonstrated on a Samsung 40-inch LCD TV. Measurement results show that the proposed techniques significantly reduce the motion blur artifacts, enhance the static contrast ratio by about 3X, and reduce the power consumption by 10% on average. KeywordsLED backlight, backlight scanning, backlight local dimming, motion blur, contrast ratio, low power.