Laser video projection system and method with anti-piracy...

Details Laser video projection system and method with anti-piracy... Laser video projection system and method with anti-piracy...

2006-09-05

2006-09-05

Harvey, Minsun Oh (Department: 2828)

Coherent light generators

Particular beam control device

Q-switch

C369S084000, C380S201000

Reexamination Certificate

active

07103074

ABSTRACT:
A pulsed laser device and a laser display system using the pulsed laser device are disclosed that thwart recording of displayed video images with electronic imaging devices. The pulsed laser device is Q-switched, whereby the Q-switch trigger pulses have a temporal pattern that includes a blanking period of a duration that is longer than a repetition time between consecutive trigger pulses and shorter than a time period perceived by the human eye. The output beam of the Q-switched pulse laser is frequency-converted by non-linear optical frequency conversion into an imaging beam, for example, a three-color RBG beam, that can be modulated for displaying color images. The blanking period renders the displayed images practically unsuitable for off-screen recording with electronic image recording devices, such as CCD movie cameras.

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Takeuchi, Eric, et al., “Laser Digital Cinema”, Proc. SPIE, vol. 4294, pp. 28-35 (2001).

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