A clipping reduction algorithm using backlight luminance compensation for local dimming liquid crystal displays

A constrained error diffusion method to shape quantization noise in backlight dimming

“…Even so, LED backlight composes the largest percent of the total power consumption of a display device. Thus, backlight dimming technologies [1][2][3][4][5][6][7][8][9][10][11][12][13][14] have been extensively investigated to dynamically reduce the power consumption and preserve the contrast of the displayed images simultaneously.…”

“…Backlight dimming could be classified to global backlight dimming [13,14] and local backlight dimming [1][2][3][4][5][6][7][8][9][10][11][12]. Global backlight dimming controls the luminance of the whole screen, while local backlight dimming controls the luminance of certain screen areas separately.…”

“…Liao et al [5] determine the backlight signal based on the inverse of the mapping function for histogram equalization (IMF method). Hong et al [6] minimize the clipping artifact according to a pre-defined threshold of maximum allowable number of clipped pixels. It is extended to color channels and a postprocessing enhancement algorithm is proposed in [7].…”

“…This makes it be favored for most backlight dimming applications. Since clipping can cause severe visible distortion, most backlight dimming algorithms try their best to select a backlight intensity level to reduce clipping [2,6,[9][10][11].…”

Cooperative local dimming for accurate backlight brightness matching

“…To solve these problems, local dimming backlight control technology has been studied. Hong et al [1] proposed a backlight luminance compensation algorithm to reduce clipping artifacts caused by local dimming. Their work focuses on local dimming techniques that utilise the average brightness levels.…”