EFFICIENT, DYNAMIC, HIGH CONTRAST LENSING WITH APPLICATIONS TO IMAGING, ILLUMINATION AND PROJECTION

摘要

A new projector design combines one spatial light modulator that affects only the phase of the illumination, and one spatial light modulator that only affects its amplitude (intensity). The phase-only modulator curves the wavefront of light and acts as a pre-modulator for a conventional amplitude modulator. This approach works with both white light and laser illumination, generating a coarse image representation efficiently, thus enabling, within a single image frame, significantly elevated highlights as well as darker black levels while reducing the overall light source power requirements.

主权项

1. Apparatus for controlling a phase modulator to display a target light pattern defined by image data, the apparatus comprising a data processor in communication with the phase modulator, the data processor configured to:
receive the image data as input; initialize a warped image based on the image data, the warped image warped from the target light pattern by distortions corresponding to a phase function p(x) representing a phase shift applied by the phase modulator for regions in the lens plane; refine the phase function and the warped image by performing a plurality of iterations wherein each of the plurality of iterations includes:
a step of updating the phase function by performing an optimization which yields an updated phase function wherein the updated phase function reduces a difference measure between the warped image and the inverse of a magnification provided by the phase function at points in the warped image; anda step of warping the target light pattern onto the lens plane using a distortion u(x) produced by the updated phase function p(x) to yield an updated warped image; and generate control signals for the phase modulator based on the refined phase function.