Projection system using high-frequency drive modulation to...

Details Projection system using high-frequency drive modulation to... Projection system using high-frequency drive modulation to...

2011-07-05

2011-07-05

Sohn, Seung C (Department: 2878)

Optics: image projectors

Composite projected image

Multicolor picture

C348S471000

Reexamination Certificate

active

07972008

ABSTRACT:
An image producing system (1400) delivers images (1414) having reduced speckle by employing one or more drive circuits (1404, 1405, 1406) that deliver both a direct current drive signal (205) and an alternating current drive signal (405) to one or more lasers (1401, 1402, 1403). Specifically, an alternating current drive circuit (403) is used in conjunction with a direct current drive circuit (203) 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 (1401) or the blue laser (1403) of a multi-laser system are modulated in such a fashion, their emitted spectral widths (407) greatly expand, thereby reducing speckle in projected images (1414).

REFERENCES:
patent: 3934265 (1976-01-01), Tanaka et al.
patent: 3967312 (1976-06-01), Sample
patent: 4675721 (1987-06-01), Dirr

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