Histogram generation and evaluation for dynamic pixel and backlight control

Abstract

Systems, methods, and devices are provided for histogram generation and evaluation used in adjusting the power consumed by a backlight of an electronic display. One such method involves generating a pixel brightness histogram of an image frame passing through a pixel pipeline in a nonlinear space. One or more pixel brightness values from the histogram may be selected before being converted from the nonlinear space into a linear space. A tone mapping function and backlight intensity are determined based at least in part on the one or more pixel brightness values in the linear space. The resulting tone mapping function is converted to the nonlinear space and applied to the image frame or a subsequent image frame in the pixel pipeline. The pixels of the image frame to which the nondistorting portion of the tone mapping function is applied may appear substantially undistorted despite a reduction in backlight intensity.