Patent · US Active

Laser projection white balance tracking

US8384620B2 · kind B2 · utility

3Cited by

3References

20Claims

0Family size

Assignee

Microvision, Inc. · US

Inventors

Margaret K. Brown · Seattle, US
Mark Champion · Kenmore, US
Michael Schaaf · Solingen, DE
Heng Huang · Taipei, TW

Key dates

Filing date	May 4, 2011
Grant date	Feb 26, 2013
Priority date	—
Expiry date	Nov 18, 2031

Classification

Technology area (CPC G)Physics
CPC primaryG09G2360/145
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.