26 April 2002 Speckle contrast reduction in laser projection displays
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Proceedings Volume 4657, Projection Displays VIII; (2002); doi: 10.1117/12.463781
Event: Electronic Imaging, 2002, San Jose, California, United States
Abstract
Speckle arises when coherent light scattered from a rough surface is detected by an intensity detector that has a finite aperture, such as an observer. In a laser projection display, the presence of speckle tends to mask the image information and therefore its reduction is highly desirable. Speckle contrast reduction is based on averaging a number of speckle configurations within the spatio-temporal resolution of the detector through diversification of the light parameters - angle, polarization, and wavelength. The maximum speckle contrast reduction for a given system will be derived, and two novel approaches to achieve the maximum reduction will be introduced. Application to the Grating Light Valve (GLV TM) laser projection system using the Hadamard diffuser has resulted in a suppression to 8% residual speckle contrast.
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Jahja I. Trisnadi, "Speckle contrast reduction in laser projection displays", Proc. SPIE 4657, Projection Displays VIII, (26 April 2002); doi: 10.1117/12.463781; https://doi.org/10.1117/12.463781
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KEYWORDS
Speckle

Sensors

Diffusers

Polarization

Projection systems

Laser based displays

Speckle pattern

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