Patents by Inventor Birendra Bahadur

Birendra Bahadur 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).

  • Autostereoscopic display
    Patent number: 9042014
    Abstract: A method and system for autostereoscopic display of stereoscopic images may include: illuminating at least one light source; configuring a lightguide to direct light from at least one light source to a first focal point; configuring a transmissive optical display according to a first stereoscopic image of a stereoscopic image pair; configuring the lightguide to direct light from at least one light source to a second focal point; and configuring the transmissive optical display according to a second stereoscopic image of the stereoscopic image pair.
    Type: Grant
    Filed: September 25, 2009
    Date of Patent: May 26, 2015
    Assignee: Rockwell Collins, Inc.
    Inventors: Vijay M. Sethna, Tracy J. Barnidge, Bruce D. Hufnagel, Joseph L. Tchon, Birendra Bahadur
  • Method and apparatus for data entry for a liquid crystal display
    Patent number: 7573466
    Abstract: A touch screen for LCDs which uses a plurality of shockwave detectors disposed around the periphery of the viewing area to detect the location of a touch or tap which is the point of origin of an expanding shockwave.
    Type: Grant
    Filed: September 17, 2003
    Date of Patent: August 11, 2009
    Assignee: Rockwell Collins, Inc.
    Inventors: Vincent P. Marzen, Albert N. Stuppi, Gary D. Bishop, Birendra Bahadur, Michael R. Jones
  • Dual-mode LCD backlight
    Patent number: 6639349
    Abstract: A light system is disclosed that may be used as a dual-mode LCD backlight. The light system includes a fluorescent lamp and a secondary light source that is attached to or formed upon an outer surface of the fluorescent lamp. The fluorescent lamp diffuses the light of the secondary light source.
    Type: Grant
    Filed: June 16, 2000
    Date of Patent: October 28, 2003
    Assignee: Rockwell Collins, Inc.
    Inventor: Birendra Bahadur
  • Wide viewing-angle dye-doped TN LCD with retardation films
    Patent number: 5589965
    Abstract: A wide viewing-angle twisted nematic liquid crystal display is provided. The wide viewing-angle is achieved by the application of properly aligned retardation films in between a 90.degree. twisted nematic liquid crystal cell and one of two polarizers, as well by doping the liquid crystal with an appropriate amount of dichroic dye molecules. These two additional elements not only increase the viewing-angle but also improve the chromaticity of the display. The retardation films convert the polarization state of the transmitted light of the liquid crystal cell to a more linearly polarized light in order to achieve higher contrast ratio at -45.degree. and +45.degree. scanning direction relative to the rub direction of the back substrate of the cell. The dichroic dye molecules operate on the absorption principle and further improve the contrast ratio along a 90.degree. scanning direction. By combining both elements in a liquid crystal display, a much wider viewing-angle is achieved.
    Type: Grant
    Filed: June 23, 1994
    Date of Patent: December 31, 1996
    Assignee: Litton Systems (Canada) Limited
    Inventors: Birendra Bahadur, Kam H. Wan