Patents by Inventor Paulus B.J. Schaareman

Paulus B.J. Schaareman 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).

  • Illumination system and display device including such a system
    Patent number: 5721603
    Abstract: An illumination system comprising a reflector, a cholesteric filter and a depolarizer. The cholesteric filter is arranged between a radiation source and, in a display device, a display panel, and is selected to transmit radiation having a selected state of polarization in a selected wavelength range, while reflecting otherwise polarized radiation in that wavelength range. The depolarizer is disposed between the reflector and the cholesteric filter. Radiation reflected by the cholesteric filter is re-reflected to the filter by the reflector and, having been depolarized in the depolarizer, is transmitted to the extent it has the selected state of polarization in the selected wavelength.
    Type: Grant
    Filed: December 17, 1996
    Date of Patent: February 24, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Adrianus J.S.M. De Vaan, Paulus B.J. Schaareman