The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 17, 2007
Filed:
Dec. 14, 2004
Sergei V. Govorkov, Boca Raton, FL (US);
Luis A. Spinelli, Sunnyvale, CA (US);
Juan L. Chilla, Sunnyvale, CA (US);
Andrea Caprara, Menlo Park, CA (US);
Murray K. Reed, Menlo Park, CA (US);
Sergei V. Govorkov, Boca Raton, FL (US);
Luis A. Spinelli, Sunnyvale, CA (US);
Juan L. Chilla, Sunnyvale, CA (US);
Andrea Caprara, Menlo Park, CA (US);
Murray K. Reed, Menlo Park, CA (US);
Coherent, Inc., Santa Clara, CA (US);
Abstract
A projection video display includes at least one laser for delivering a light beam. The display includes a beam homogenizer and a condenser lens. A scanning arrangement is provided for scanning the light in beam in a particular pattern over the condenser lens in a manner that effectively increases the beam divergence. The scanned beam is homogenized by a beam homogenizer and a spatial light modulator is arranged to receive the homogenized scanned light beam and spatially modulate the beam in accordance with a component of an image to be displayed. Projection optics are projecting the homogenized scanned light beam onto a screen. The scanning provides that the homogenized scanned light beam at the screen has a coherence radius less than the original coherence radius of the beam. The reduced coherence radius contributes to minimizing speckle contrast in the image displayed on the screen. The screen includes one or more features providing a further contribution to minimizing speckle contrast in the displayed image. In one example, the screen includes a transparent cell containing a liquid having light scattering particles in suspension.