Patents Assigned to Projectavision, Inc.
  • Patent number: 5900982
    Abstract: A light valve such as an active matrix LCD between crossed polarizers, utilizing, for instance, individual transistors to control each "pixel area" of the LCD and storage elements to store video signal data for each pixel, with optically shielded "dead spaces" between pixels to eliminate electric field cross-talk and non-information-bearing light bleed-through, is illuminated with a bright independent light source which creates a video image projected via specialized projection optics onto an internal or external screen without distortions, regardless of the angle of projection onto the screen. Use of heat sinks, IR reflective coatings, heat absorbing optics, optional fluid and a thermistor controlled pixel transistor bias voltage injection servo circuit stabilizes image performance, maintaining accurate color and contrast levels as the LCD changes temperature.
    Type: Grant
    Filed: November 3, 1997
    Date of Patent: May 4, 1999
    Assignee: Projectavision, Inc.
    Inventors: Eugene Dolgoff, Malcolm MacFarlane, Paul B. Christie
  • Patent number: 5602679
    Abstract: A light valve such as an active matrix LCD between crossed polarizers, utilizing, for instance, individual transistors to control each "pixel area" of the LCD and storage elements to store video signal data for each pixel, with optically shielded "dead spaces" between pixels to eliminate electric field cross-talk and non-information-bearing light bleed-through, is illuminated with a bright independent light source which creates a video image projected via specialized projection optics onto an internal or external screen without distortions, regardless of the angle of projection onto the screen. Use of heat sinks, IR reflective coatings, heat absorbing optics, optional fluid and a thermistor controlled pixel transistor bias voltage injection servo circuit stabilizes image performance, maintaining accurate color and contrast levels as the LCD changes temperature.
    Type: Grant
    Filed: February 6, 1995
    Date of Patent: February 11, 1997
    Assignee: Projectavision, Inc.
    Inventors: Eugene Dolgoff, Malcolm J. MacFarlane, Paul B. Christie
  • Patent number: 5580146
    Abstract: A rear screen video display system includes a panel assembly having a front panel for supporting a screen, a base panel attachable to the front panel, and two side panels pivotally attached to the front panel, the system further includes a housing structure supported on the base panel for housing a projector, the base panel having elements cooperating with respective elements of housing structure for releasably retaining the structure, the housing structure receiving a stand for supporting the projector in the housing.
    Type: Grant
    Filed: August 11, 1995
    Date of Patent: December 3, 1996
    Assignee: Projectavision, Inc.
    Inventor: Marvin Maslow
  • Patent number: 5491585
    Abstract: A rear screen television cabinet, comprising a cabinet having front portions including a top, two sides and a front face, viewing surface on the front face, a mirror system comprising a plurality of mirrors for reflecting and successively enlarging and reflecting an incident beam onto the rear screen and a rear assembly which substantially closes said cabinet and is foldable or collapsible to render said cabinet portable, is disclosed. The cabinet's mirror system receives and successively enlarges and reflect an incident beam from a projector, to project a large image onto the viewing surface.
    Type: Grant
    Filed: April 7, 1994
    Date of Patent: February 13, 1996
    Assignee: Projectavision, Inc.
    Inventor: Eugene Dolgoff
  • Patent number: D373354
    Type: Grant
    Filed: April 10, 1995
    Date of Patent: September 3, 1996
    Assignee: Projectavision, Inc.
    Inventor: Marvin Maslow
  • Patent number: D379978
    Type: Grant
    Filed: September 3, 1993
    Date of Patent: June 17, 1997
    Assignee: Projectavision, Inc.
    Inventor: Eugene Dolgoff