Rapid estimation of effective illuminance patterns for projected light fields

A controller for a display, the controller comprising:

• electronics operable to:
• (i) output first driving signals useful for controlling a plurality of light sources to emit light having intensities according to the first driving signals and (ii) output second driving signals useful for controlling pixels of a spatial light modulator to modulate light from the light sources;
• a plurality of stored point spread function components, the stored point spread function components collectively representing point spread functions for the plurality of light sources;
• the controller configured to calculate using the plurality of stored point spread function components an effective luminance pattern that would be present at a modulator when the light sources are driven according to the first driving signals and to control the electronics to generate the second driving signals based on the calculated effective luminance pattern.