Microvision, Inc.

Lifford McLauchlan

Margaret K Brown

Bruce Rothaar

Robert James Jackson

Steve Holmes

Michael Lee Schaaf

Joel D Hopkins

Jenchao J Lin

Clint Charles Rollins

Mehrube Mehrubeoglu

Gregory Schneider

The radiance of a laser is a function of drive current. The radiance is also a function of other factors, such as age and temperature. A laser projection device adjusts laser drive parameters using a gradient descent operation. The device parameters may be adjusted iteratively and periodically. The period may be shorter or longer than a scan line in a video image.

Closed loop laser control

A scanning beam projection system includes a scanning mirror having a fast-scan axis and a slow-scan axis. Movement on the slow-scan axis is controlled by a slow-scan scanning mirror control system. The control system receives position information describing angular displacement of the mirror. An outer loop of the control system operates in the frequency domain and determines harmonic drive coefficients for a scanning mirror drive signal. An inner loop of the control system operates in the time domain and compensates for a scanning mirror resonant vibration mode at a frequency within the frequency band occupied by the harmonic drive coefficients.

Scanning mirror control

Growing community of inventors

Corpus Christi, TX, United States of America

Lifford McLauchlan