RGBW Display Backlight Brightness Control via Saturation Segmentation

The patent applies preliminary action by pre-calculating saturation values for all pixels in the image frame before backlight adjustment. The processing device divides the saturation interval into sub-intervals, calculates saturation values using the formula s = (Max(R,G,B) - Min(R,G,B)) / (Max(R,G,B) + Min(R,G,B) + 1), and determines enhanced coefficients in advance. This preliminary processing enables the backlight to be adjusted according to pre-computed saturation data, thereby brightening pure-color images while maintaining the power-saving benefits of the W sub-pixel configuration.

The patent applies local quality by adjusting the backlight intensity locally according to the saturation characteristics of different regions in the image. The processing device divides the saturation interval into multiple sub-intervals and assigns different enhanced coefficients to each sub-interval. Pixels with higher saturation values receive greater backlight enhancement, while pixels with lower saturation values receive minimal or no enhancement. This localized adjustment brightens pure-color regions without unnecessarily increasing backlight intensity in other regions, thereby maintaining the high aperture rate benefit of the W sub-pixel configuration.

The patent applies segmentation by dividing the saturation interval into multiple sub-intervals and calculating saturation values for each pixel based on its R, G, B component values. The processing device segments the image processing into distinct stages: saturation calculation, sub-interval classification, enhanced coefficient determination, and backlight adjustment. This segmented approach breaks down the complex task of pure-color image brightening into manageable, independent processing steps, making the system more tractable and easier to implement despite the increased functionality.