Patent ID: 7821490
Filing Date: 2010-10-26
Classification: G09G

Abstract:
1. A backlight system for an electronic device, comprising: a display for displaying an image to be backlit; memory storing a numeric representation of said image on a pixel-by-pixel basis; a backlight adjustment module to calculate a pixel-by-pixel, running average of an intensity of said image using said numeric representation and to determine a backlight level for said image using said running average, said running average being calculated according to an equation: wherein, A N is the new running average, A N−1 is the previous running average, X is the new value added to the running average, and N is the number of pixels included in the running average so far; and a backlight control system to provide a backlight for said display, said backlight control system responsive to control signals generated by said backlight adjustment module based on said running average and to a signal representing an amount of ambient light detected around the device to further adjust said backlight level to decrease said backlight level when said amount of ambient light is low and to increase said backlight level when said amount of ambient light is high up to a threshold and then to turn said backlight off.