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Stereoscopic 3-D viewing system and glasses having electrooptical shutters controlled by control signals produced using horizontal pulse detection within the vertical synchronization pulse period of computer generated video signals

  • US 5,821,989 A
  • Filed: 05/15/1996
  • Issued: 10/13/1998
  • Est. Priority Date: 06/11/1990
  • Status: Expired due to Fees
First Claim
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1. A stereoscopic 3-D image viewing system for stereoscopically viewing 3-D images displayed on a video display device responsive to a computer-generated video signal produced from a computer display adapter, said computer-generated video signal comprising a horizontal synchronization signal including horizontal synchronization pulses and a vertical synchronization signal having a vertical sychronization pulse period (VSPP), said stereoscopic 3-D image viewing system comprising:

  • stereoscopic viewing glasses having a pair of optical-shutters for viewing stereoscopic image pairs displayed on said video display device according to a time-multiplexing display technique, each said optical-shutter having either optically-transparent state or an optically-opaque state which is selected by a shutter control pulse signal transmitted to said stereoscopic viewing glasses; and

    shutter control pulse signal generator/transmitter connectable between said computer display adapter and said video display device, receiving said computer-generated video signal as input, and generating shutter control pulse signals for use in controlling the optical state of said optical-shutters, said shutter control pulse signal generator/transmitter includinghorizontal synchronization pulse detection means for detecting the number of horizontal synchronization pulses transmitted from said computer display adapter during each said vertical synchronization pulse period and producing a horizontal synchronization pulse count (HSPC) indicative thereof, andshutter control producing means, responsive to said HSPC, for producing shutter control pulse signals for controlling the optical state of said optical-shutter viewing glasses, andshutter control signal transmission means for transmitting said shutter control pulse signals produced from said shutter control signal producing means.

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