Abstract: A technique for modulating pixels of a display panel for forming an image. Each pixel has an associated pixel frame, which is a period of time during which the pixel is modulated to achieve an appropriate greyscale level for the pixel. Each pixel frame includes a plurality of sub-frames. During each of the sub-frames, the pixel is placed in ‘on’ condition or in an ‘off’ condition according to a selected one of a plurality of predetermined greyscale sequences. Each greyscale sequence corresponds to a greyscale level for the pixel frame. A display frame is formed when each pixel in the display is appropriately modulated according to an image to be displayed. The displayed image is continually updated by displaying a sequence of display frames. The display panel is divided into blocks of sixteen pixels arranged in a four-by-four array. The greyscale sequences for pixels in a block are offset from one another by various numbers of sub-frames. This offset is termed pixel dispersion.

Abstract: A technique for performing spacial dithering for a digital display system. A display panel is portioned into eight-by-eight arrays of 64 pixels, each pixel including three primary color sub-pixels. A predetermined number of bits represent a color level for each sub-pixel according to image data. If the display system can accept only fewer bits than the predetermined number, bits must be discarded. The discarded bits are used to modify the remaining bits before the remaining bits are passed to the display system. A memory stores 64 tables, each table including an entry for each pixel within an eight-by-eight array. The entry for a pixel determines whether or not the color level for the corresponding sub-pixel is to be decremented by one. A first of the sixty-four tables does not result in decrementing any color levels. Each successive table decrements the color level for one more pixel than the previous table. The values of discarded bits select among the stored tables.