Patents by Inventor Roger Hollister

Roger Hollister has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Liquid crystal light valve projector with improved contrast ratio and with 0.27 wavelength compensation for birefringence in the liquid crystal light valve
    Patent number: 5576854
    Abstract: In a liquid crystal light valve projector, a quarter-wave compensator plate is disposed between a polarization plate and a liquid crystal light valve to compensate for polarization irregularities induced by the off-incident reflections in the cone of light projected onto the LCLV. The quarter-wave compensation plate reverses the phase of the P component of said illumination light with respect to said compensator plate by 180.degree. thereby eliminating P-polarization leakage during the dark state of an LCLV projector. The invention also combines the compensator plate with a heat shield and a low stress-optical coefficient counter electrode substrate to reduce the birefringence of the LCLV thereby also minimizing leakage of P-polarized light onto the projection screen during the dark state of the projector.
    Type: Grant
    Filed: November 12, 1993
    Date of Patent: November 19, 1996
    Assignee: Hughes-JVC Technology Corporation
    Inventors: Jack H. Schmidt, Ned Nestorovic, Rodney D. Sterling, Joseph M. Haggerty, Javier A. Ruiz, Robert Edwards, Roger Hollister