Pixel compesation for locally dimmed backlight displays

This paper proposes a novel pixel compensation technique for Led backlight displays. The proposed technique explicitly computes the screen intensity distribution using the point spread function (PSF) of the individual Leds to calculate per-pixel-based intensity decrease due to the dimmed Leds. The intensity of LCD values from 0 to 255 for RGB channels are measured to compensate intensity decrease due to dimming operation. In order to keep emitted intensity through each pixel for each RGB channel constant, the proposed method matches the original intensity distribution using an objective comparison metric. The implementation has proven to achieve superior static and dynamic contrast ratios compared to conventional displays.