Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1989-07-31
1990-10-30
Britton, Howard W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358149, 455603, H04N 1304
Patent
active
049672681
ABSTRACT:
A liquid crystal shutter system for selecting fields of a field-sequential image, by transmitting the field-sequential image, with a synchronization signal, to one or more remote liquid crystal cell shutter assemblies. Each shutter assembly transmits selected fields of the field-sequential image in response to a drive signal, and includes a drive circuit for receiving the synchronization signal and generating each drive signal in response to the synchronization signal so that each drive signal has transitions synchronized with image fields. The drive circuit is capable of rapidly processing short duration synchronization signals with very low power consumption. In one embodiment, two liquid crystal cell assemblies are mounted in an eyeglass frame and used as a wireless selection device for a field-sequential stereoscopic image. Preferably, the invention includes a synchronization signal receiver having a narrow angular reception range so that the receiver is sensitive to only one synchronization signal at a time, so that the invention may be employed to view several monitors without interference between different synchronization signals from the different monitors. Preferably, the inventive shutter assemblies are capable of operating in a nonoccluding state, and each inventive shutter assembly may conveniently be switched between a state suitable for stereoscopic viewing and a non-occluding state suitable for viewing a non-stereoscopic image.
REFERENCES:
patent: 4424529 (1984-01-01), Roese
patent: 4583117 (1986-04-01), Lipton
patent: 4698668 (1987-10-01), Milgram
patent: 4736246 (1988-04-01), Nishikawa
patent: 4772943 (1988-09-01), Nakagawa
patent: 4772944 (1988-09-01), Yoshimura
patent: 4786966 (1988-11-01), Hanson
patent: 4792850 (1988-12-01), Lipton et al.
Ackerman Marvin
Lipton Lenny
Britton Howard W.
StereoGraphics
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