Patents by Inventor Richard B. Dingwall

Richard B. Dingwall 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).

  • Color liquid crystal display with dead front appearance having opaque mask formed on the primary display
    Patent number: 5307188
    Abstract: A liquid crystal display unit is provided which includes a primary, image-defining display and a secondary display, arranged in series with the primary display. The primary and secondary displays have equal numbers of light shutters, similarly sized and located on each display, so that when the corresponding light shutters on the primary and secondary displays are closed, substantially no light passes through the viewing side of the primary display. An opaque mask is formed on the input side of the primary display to define the shape of the image elements to be displayed. This mask covers the edges of the primary display light shutters to define the image elements display. This mask permits the primary and secondary displays to be easily aligned with each other. Color patches can be located on the light input side of the primary display light shutters so that the viewed images are in color. The use of the opaque mask to form the image elements eliminates the need to form precisely shaped color patches.
    Type: Grant
    Filed: February 2, 1993
    Date of Patent: April 26, 1994
    Assignee: Xerox Corporation
    Inventors: Richard B. Dingwall, Lowell W. Knapp, John H. Steele, James S. Celebi, Virgil J. Hull
  • Method of making color liquid crystal display with dead front appearance
    Patent number: 5220442
    Abstract: A liquid crystal display unit is provided which includes a primary, image-defining display and a secondary display, arranged in series with the primary display. The primary and secondary displays have equal numbers of light shutters, similarly sized and located on each display, so that when the primary and secondary displays are placed in series their respective light shutters are also in series. When corresponding light shutters on the primary and secondary displays are closed, substantially no light passes through the displays to the opposite side of the primary display. An opaque mask is formed on the input side of the primary display to define the shape of the image elements to be displayed. This mask covers the edges of the primary display light shutters to define the image elements such that each light shutter on the secondary display is larger in size than its corresponding image element on the primary display. This permits the primary and secondary displays to be easily aligned with each other.
    Type: Grant
    Filed: September 6, 1991
    Date of Patent: June 15, 1993
    Assignee: Xerox Corporation
    Inventors: Richard B. Dingwall, Lowell W. Knapp, John H. Steele, James S. Celebi, Virgil J. Hull