Patents by Inventor William Mathews Riedel

William Mathews Riedel 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).

  • High dynamic range liquid crystal display
    Patent number: 9541794
    Abstract: A display may have a first stage such as a color liquid crystal display stage and a second stage such as a monochromatic liquid crystal display stage that are coupled in tandem so that light from a backlight passes through both stages. The dynamic range of the display may be enhanced by using the second stage to perform local dimming operations. The pixel pitch of the second stage may be greater than the pixel pitch of the first stage to ease alignment tolerances and reduce image processing complexity. The color stage and monochromatic stages may share a polarizer. A color filter in the color stage may have an array of red, green, and blue elements or an array of white, red, green, and blue elements. The color stage may be a fringe field display and the monochrome stage may be an in-plane switching display or a twisted nematic stage.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: January 10, 2017
    Assignee: Apple Inc.
    Inventors: Jiaying Wu, Wei Chen, Cheng Chen, William Mathews Riedel, Jun Qi, John Z. Zhong, Gabriel Marcu
  • High Dynamic Range Liquid Crystal Display
    Publication number: 20150198834
    Abstract: A display may have a first stage such as a color liquid crystal display stage and a second stage such as a monochromatic liquid crystal display stage that are coupled in tandem so that light from a backlight passes through both stages. The dynamic range of the display may be enhanced by using the second stage to perform local dimming operations. The pixel pitch of the second stage may be greater than the pixel pitch of the first stage to ease alignment tolerances and reduce image processing complexity. The color stage and monochromatic stages may share a polarizer. A color filter in the color stage may have an array of red, green, and blue elements or an array of white, red, green, and blue elements. The color stage may be a fringe field display and the monochrome stage may be an in-plane switching display or a twisted nematic stage.
    Type: Application
    Filed: September 30, 2014
    Publication date: July 16, 2015
    Inventors: Jiaying Wu, Wei Chen, Cheng Chen, William Mathews Riedel, Jun Qi, John Z. Zhong, Gabriel Marcu