Patent ID: 8203582

Claim:
A method for processing image data for displaying an image in a display window of a display unit comprising some subpixels each of which is to emit just one of a plurality of primary colors and other subpixels each of which is to emit a white light where the subpixels are to each have a luminance depending on the subpixel's state defined using a supplied subpixel value for the respective subpixel, the method comprising: (1) obtaining, by a circuit, pixel data which represent, for each pixel, the pixel's color as mapped into coordinates associated with the primary colors; (2) performing, by the circuit, a subpixel rendering (SPR) operation to provide a respective subpixel value for each respective subpixel in a predefined set of three or more subpixels of the display window, the respective subpixel values being used in defining the respective subpixel's state in displaying the image; wherein the SPR operation comprises, for at least one pixel PX 1 in the predefined set and for at least two subpixels also in the predefined set and which are each configured for emitting a primary color PC 1 : (2A) testing the pixel data to determine if the pixel PX 1 and/or one or more of its adjacent pixels satisfy a predefined first test; and (2B) determining the subpixel values for the two subpixels of the primary color PC 1 , wherein: (2B.1) if the first test fails, then in the SPR operation, the primary color PC 1 's coordinate of the pixel PX 1 contributes to the subpixel values of the two subpixels with equal non-zero weights; (2B.2) if the first test passes, then in the SPR operation, the primary color PCPs coordinate of the pixel PX 1 contributes to the subpixel values of the two subpixels with different weights.