Efficient, dynamic, high contrast lensing with applications to imaging, illumination and projection
AssigneeBarco Visual Solutions, Inc.
InventorsGerwin Damberg, James Gregson, Wolfgang Heidrich
Life of this patent
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Abstract
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.
Claims20
Apparatus for controlling a phase modulator to display an image defined by image data, the apparatus comprising a data processor in communication with the phase modulator, the data processor configured to:
- determine an objective function based on the image data;
- transform the objective function into a frequency space;
- minimize the transformed objective function in the frequency space to obtain a phase function in the frequency space;
- and
- inverse transform the phase function to obtain a solution phase function relating the phase of the phase modulator to a position in two dimensions.
A method for controlling a phase modulator to display an image defined by image data, the method comprising:
- determining an objective function based on the image data;
- transforming the objective function into a frequency space;
- minimizing the transformed objective function in the frequency space to obtain a phase function in the frequency space;
- and
- inverse transform the phase function to obtain a solution phase function relating the phase of the phase modulator to a position in two dimensions.
Dependencies are inferred from the claim text.