Projector with phase hologram modulator
AssigneeTexas Instruments Incorporated
InventorsMuralidhar Madabhushi Balaji, Jeffrey Matthew Kempf, Terry Alan Bartlett
Life of this patent
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Abstract
A projection system includes: an illumination source configured to output illumination light; a phase light modulator (PLM) optically coupled to the illumination source, the PLM configured to: receive the illumination light; phase modulate the illumination light while displaying a phase hologram, to produce modulated light; and projection optics coupled to the PLM, the projection optics configured to receive the modulated light and to project an image responsive to the modulated light; wherein both a mean in intensity and a variance in intensity in bright regions of the projected image is greater than the mean intensity and the variance in intensity in dark regions of the projected image.
Claims13
A projection system comprising:
- an illumination source configured to output illumination light;
- a processing element configured to:
- obtain a digital image having a dark region and a bright region;
- and
- produce a phase hologram based on the digital image comprising adding noise comprising first added noise in the dark region and second added noise in the bright region, the dark region having a first intensity and first added noise, the bright region having a second intensity and second added noise, the second intensity greater than the first intensity and the second added noise greater than the first added noise;
- and
- a phase light modulator (PLM) coupled to the processing element and optically coupled to the illumination source, the PLM configured to:
- receive the illumination light;
- and
- phase modulate the illumination light based on the phase hologram, to produce modulated light to produce an image at a viewing distance, wherein the phase hologram causes the image to have a dark region and a bright region.
A method comprising:
- providing illumination light from an illumination source;
- obtaining, by a processing element, a digital image having a dark region and a bright region;
- producing, by the processing element, a phase hologram based on the digital image comprising adding noise comprising first added noise in the dark region and second added noise in the bright region, the dark region having a first intensity and first added noise, the bright region having a second intensity and second added noise, the second intensity greater than the first intensity and the second added noise greater than the first added noise;
- receiving the illumination light on a phase light modulator;
- and
- modulating, by the phase light modulator, the illumination light, to produce a projected image based on the phase hologram.
Dependencies are inferred from the claim text.