Patent ID: 9646546
Date: 2017-05-09
CPC Classifications: G09G

Claim:
1. A method for controlling a display to display a color image specified by image data, the image data specifying color and brightness for each of a plurality of image pixels, the display comprising a modulator having an active area comprising a plurality of modulator pixels and a light source operable to selectively illuminate the active area of the modulator with light of any one or more of a plurality of colors, the method comprising: separately, for each of a plurality of parts of the active area of the modulator: determining from the image data a selected color of the plurality of colors that is most important to the part by one or any combination of: based on the image data for the selected color determining first light source driving signals which, when applied to the light source, will cause the light source to illuminate the part with a spatially-varying luminance pattern of the selected color; determining first pixel driving values for those of the modulator pixels in the part based at least on both the image data for the selected color and the first light source driving signals; determining additional light source control signals for at least one of the plurality of colors other than the selected color based on the first pixel driving values and the image data for the one or more colors other than the selected color wherein, when applied to the light source, the additional light source control signals will cause the light source to illuminate the part with spatially-varying luminance patterns of each of the one or more colors other than the selected color; and applying the first pixel driving values to drive the pixels of the modulator to selectively allow light from the part of the active area to pass to a viewing area and, while applying the first pixel driving values to drive the modulator pixels: applying the first light source driving signals to cause the light source to illuminate the part of the active area of the modulator with the spatially varying luminance pattern of the selected color and applying the additional light source driving signals to cause the spatially varying luminance patterns of each of the one or more colors other than the selected color.