Patents Represented by Attorney, Agent or Law Firm Kevin R. Raasch
  • Patent number: 6381068
    Abstract: Reflective front projection screens capable of projecting an image with enhanced contrast and a wide viewing angle in the presence of relatively high levels of ambient light are disclosed along with projection systems using the screens. The projection screens include a reflective polarizing element in combination with a diffusing element and/or glare suppressing element. The reflective polarizing element transmits light of one polarization state and reflects light of a different polarization state. The reflective polarizing element may be diffusely reflective or specularly reflective and the optical properties of the diffusing element and/or glare suppressing element may be selected based on the optical properties of the reflective polarizing element to further enhance image brightness and contrast.
    Type: Grant
    Filed: March 19, 1999
    Date of Patent: April 30, 2002
    Assignee: 3M Innovative Properties Company
    Inventors: Takashi Harada, Yorinobu Takamatsu, Makoto Ishikawa, Charles L. Bruzzone, Robert S. Moshrefzadeh, Timothy J. Nevitt, Andrew J. Ouderkirk