Color Dependent Content Adaptive Backlight Control

摘要

A backlight for a LCD comprises two or LED arrays, each corresponding to a respective color channel. A control circuit controls the supply current to each LED array separately based on the content of a displayed image to reduce the current consumption of the backlight. The control circuit generates separate histograms of transmittance values for each of two or more color channels in the image, and stretches the histograms for the two or more color channels by respective stretching factors to generate a stretched image. The stretched image is displayed on the LCD. The control circuit further control the current supply to the two or more LED arrays in the backlight to reduce a brightness of light emitted by the two or more LED arrays in dependence on respective stretching factors for the corresponding color channel.

主权项

1. A method of controlling power consumption of a backlight in an electronic display, wherein the backlight comprises two or more LED arrays, each corresponding to a respective color channel in an image to be displayed, the method characterized by:
generating separate histograms of transmittance values for two or more of said color channels in said image; stretching the histograms for said two or more color channels by respective stretching factors to generate a stretched image; displaying the stretched image on said electronic display; and separately controlling two or more led arrays in said backlight to reduce a brightness of light emitted by said two or more led arrays in dependence on respective stretching factors applied to the histograms for the corresponding color channels.