Patent ID: 7817131

Claim:
A method of processing a series of frames for displaying on a display having a first modulator disposed to illuminate a second modulator, the method comprising: (a) receiving a frame of image data and designating the frame as a key frame; (b) based on the image data for the key frame, calculating a key frame first modulation signal for controlling a plurality of controllable elements of the first modulator to provide a spatially-varying light pattern on the second modulator; (c) based on the key frame first modulation signal, calculating a key frame luminance map indicative of the intensity of light that would be incident at points on the second modulator if the first modulator were driven according to the key frame first modulation signal; and, (d) for each of a plurality of frames in the series of frames: (i) based on image data for the frame and on the key frame luminance map, determining a frame second modulation signal for controlling elements of the second modulator to reproduce an image specified in the image data for the frame; and, (ii) selecting the key frame first modulation signal and the frame second modulation signal to be applied respectively to the first and second modulators to display the image specified by the image data for the frame.