Patent ID: 8531353

Claim:
A method for generating control values for pixels of a first plurality of pixels in a dual modulator display in displaying a desired image specified by image data, wherein the first plurality of pixels is configured to emit light which illuminates a second plurality of pixels in response to control values applied to the first plurality of pixels and the second plurality of pixels is configured to modulate light from the first plurality of pixels, the method comprising: from the image data defining the desired image, generating a target light pattern to be emitted by the first plurality of pixels onto the second plurality of pixels and initializing a set of control values capable of being applied to drive the first plurality of pixels to cause the first plurality of pixels to emit light to produce an approximation of the desired image; generating an estimated light pattern that would result from applying the set of control values to drive the pixels of the first plurality of pixels; and, refining the set of control values by determining for a location corresponding to a pixel of the first plurality of pixels a change in one or more control values of the set of control values and a corresponding change in the estimated light pattern at the location corresponding to the pixel, and applying the change to the set of control values if the change reduces a difference between the estimated light pattern and the target light pattern.