Patent ID: 8358293

Claim:
A method for driving light source blocks of a display apparatus, where the display apparatus displays images over the course of corresponding frames in whose respective time periods at least part of a respectively and then displayed image is refreshed, the method comprising, for at least one frame: receiving an image signal defining an image to be displayed on the display apparatus during the frame, the image comprising a plurality of image pixels, wherein each light source block corresponds to an image pixels block which is a block of one or more image pixels to be displayed using light provided by the corresponding light source block; for each image pixels block, determining, from the image signal, a block mean value and a block maximum value which are luminance-related values and are different respective functions of the to-be-displayed luminances of the image pixels of the image pixels block; determining, from the image signal, a parameter corresponding to a total luminance of the frame; for each image pixels block, determining a block representative value corresponding to the determined parameter, the block representative value being a luminance-related value within a range between the block mean value and the block maximum value inclusive; during said frame, driving each light source block to provide a luminance which is a function of the corresponding block representative value.