Abstract
A critical backlight luminance method to get balance between clipping artifacts and power consumption in local dimming LCDs is proposed.Firstly,the critical backlight luminance of middle backlight blocks and edge backlight blocks are computed with different process.Then the critical luminance is compared with the backlight luminance computed by conventional method,and the larger one is selected as the ideal backlight luminance for superimposing luminance.Finally,the gray-scales after liquid crystal compensation can be obtained according to the superimposed backlight luminance.The experiment results with 81 cm(32in) LED backlight show that clipping artifacts ratio is reduced effectively and power consumption is not increased obviously.
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