White-LED backlight control for motion-blur reduction and power minimization in large LCD TVs

A 1-D LED-backlight-scanning technique 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 an 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-in. LCD TV. Measurement results show that the proposed techniques significantly reduce the motion-blur artifacts, enhance the static contrast ratio by about 3 x, and reduce the power consumption by 10% on average.