Image generation unit and method to use an image generation...

Details Image generation unit and method to use an image generation... Image generation unit and method to use an image generation...

2006-06-14

2010-06-22

Stultz, Jessica T (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

C359S242000, C359S251000

Reexamination Certificate

active

07742217

ABSTRACT:
An image generation unit with an illumination unit for generating a plurality of coherent sub-beams and for illuminating an image modulator, including a light source, and a projection lens for superimposing each of the coherent sub-beams onto a projection screen plane. An optical set-up introduces angles between each two of the sub-beams, which are chosen to produce uncorrelated speckle patterns in the projection screen plane, resulting in an interference speckle pattern. A phase modulator including a liquid crystal cell changes its directory profile in a lateral manner, thereby being able to change the phase of light of each sub-beam individually.

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Trisnadi, J. I. “Speckle Contrast Reduction in Laser Projection Displays”.,Proceedings of SPIE, vol. 4657, pp. 131-137, 2002.
“Perceived Speckle Reduction in Projection Display Systems”., IBM Technical Disclosure Bulletin, vol. 40, No. 7, pp. 9-11, 1997.

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