Patent ID: 8830256

Claim:
A method for processing image data for displaying images using a display device having white subpixels and having nonwhite color subpixels, where the white subpixels of the display device provide respective white-like luminance outputs of distributed wavelengths corresponding to a white output transfer function of the display device and wherein each subpixel of the display device has a respective luminance output depending on the subpixel's state as defined using a corresponding subpixel value represented by a corresponding subpixel value providing signal, wherein the images are displayed by the display device while using a light source providing light to a screen unit of the display device; the method comprising: (1) obtaining initial image signals which represent each image using initial color coordinates; and (2) generating from the initial image signals, corresponding subpixel value providing signals for the respective white subpixels and nonwhite color subpixels of the display device; wherein operation (2) comprises, for each current image (IM 1 ) of one or more of the represented images: (2a) generating a scaling-information signal which represents scaling information which comprises information on an output power to be generated by the light source in displaying the current image IM 1 and on how the corresponding subpixel value providing signals representing the current image IM 1 are to be scaled to match the output power of the light source, the scaling information being dependent on one or more of the images; (2b) scaling values of the corresponding subpixel value providing signals of the current image IM 1 in accordance with the scaling information to thereby generate correspondingly scaled-subpixel value providing signals; (2c) based on the white output transfer function of the display device, obtaining a color-correction signal representing respective color corrections for the scaled-subpixel value providing signals for the scaled-image signal for the current image IM 1 , the color correction being to correct for the white output transfer function of the display device, the color-correction signal being used to add color correction to at least one of the scaled-subpixel value providing signals, wherein the scaling information in the scaling-information signal for the current image IM 1 is based on the color correction added to the at least one of the scaled-subpixel value providing signals, and wherein the generating of the scaling-information signal comprises generating an un-scaled version of the at least one of the scaled-subpixel value providing signals to which the color correction has been added, the generating of the un-scaled version being based on scaling information produced for a previous image which is previous to the current image IM 1 .