Histogram-based dynamic backlight control systems and methods

A display system comprising:

• a frame buffer storing input image data;
• a display for displaying said input image data;
• a backlight for illuminating said display, said backlight comprises a set of illumination levels;
• a data structure storing information corresponding said image data and backlight illumination requests associated with said image data, said data structure partitioning said image data into groups according to said backlight illumination requests, each group among said groups being associated with a visual error value and a backlight illumination request;
• an error calculating unit for calculating values of an error measure by iteratively accumulating one or more visual error values associated one or more additional groups among said groups at each iteration until having calculated a first value of said error measure that exceeds a first error threshold after a first visual error value associated with a first group among said group has been added to a previous value for calculating said first value of said error measure, said previous value being less than said first error threshold;
• an error comparison unit for comparing said values of said error measure with said first error threshold to identify said first value of said error measure;
• and
• a processing unit for determining a backlight illumination value using at least one of a first backlight illumination request associated with said first group and a second backlight illumination request associated with a second group among said groups, a second visual error value associated with said second group having been included in calculating said previous value, wherein said backlight illumination value is employed for adjusting said backlight.