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:
Feb. 26, 2013
Filed:
May. 04, 2011
Margaret K. Brown, Seattle, WA (US);
Mark Champion, Kenmore, WA (US);
Michael Lee Schaaf, Bainbridge Island, WA (US);
Heng Huang, Sammamish, WA (US);
Margaret K. Brown, Seattle, WA (US);
Mark Champion, Kenmore, WA (US);
Michael Lee Schaaf, Bainbridge Island, WA (US);
Heng Huang, Sammamish, WA (US);
Microvision, Inc., Redmond, WA (US);
Abstract
The radiance of a laser diode is a function of laser diode drive current. The radiance is also a function of other factors, such as age and temperature. A laser projection device includes laser diodes to generate light in response to a commanded radiance, and also includes photodetectors to provide a measured radiance. The commanded radiance and measured radiance are compared, and drive currents for the laser diodes are adjusted to provide luminance and color balance tracking.