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. 05, 2011
Filed:
Oct. 21, 2008
Witold R Teller, Pullman, WA (US);
Alban N Lescure, Redmond, WA (US);
Mark O. Freeman, Snohomish, WA (US);
Witold R Teller, Pullman, WA (US);
Alban N Lescure, Redmond, WA (US);
Mark O. Freeman, Snohomish, WA (US);
Microvision, Inc., Redmond, WA (US);
Abstract
An image producing system () delivers images () having reduced speckle by employing one or more drive circuits () that deliver both a direct current drive signal () and an alternating current drive signal () to one or more lasers (). Specifically, an alternating current drive circuit () is used in conjunction with a direct current drive circuit () to modulate a drive signal. The modulation can be at a frequency of between 400 MHz and 600 MHz. When lasers, such as the red laser () or the blue laser () of a multi-laser system are modulated in such a fashion, their emitted spectral widths () greatly expand, thereby reducing speckle in projected images ().