Light-emitting semiconductor device pulse drive method and...

Details Light-emitting semiconductor device pulse drive method and... Light-emitting semiconductor device pulse drive method and...

2007-07-10

2007-07-10

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S360000

Reexamination Certificate

active

10998714

ABSTRACT:
A pulse drive method for a light-emitting semiconductor devices having a plurality of light-emitting elements emitting light at different wavelengths and comprising first lit steps in which light-emitting element(s) of any of the emitted wavelengths is/are made to light as a result of being driven at drive setting(s) for each emitted wavelength, optical output(s) from the lit light-emitting element(s) is/are detected, and the light-emitting element(s) drive setting(s) is/are adjusted based on the detected light-emitting element optical output(s); and unlit steps in which the light-emitting elements of all of the emitted wavelengths are unlit for prescribed unlit time. The first lit steps are carried out in repeated fashion while the driven light-emitting element(s) is/are switched so as to cause the light-emitting element(s) to sequentially light in pulsed fashion in turn by emitted wavelength, and the unlit step respectively intervenes between each pair of successive iterations of the first lit steps.

REFERENCES:
patent: 6016038 (2000-01-01), Mueller et al.
patent: 6459919 (2002-10-01), Lys et al.
patent: 6825619 (2004-11-01), Norris
patent: 7022960 (2006-04-01), Yamamoto et al.
patent: 7038399 (2006-05-01), Lys et al.
patent: 10-49074 (1998-02-01), None

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