Patents by Inventor Lowell F. Bohn, Jr.

Lowell F. Bohn, Jr. 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).

  • Time sequential lookup table method for a display
    Patent number: 6744443
    Abstract: A method and apparatus employing lookup tables in a time sequential manner. A substrate has a display, a digital to analog converter, and a lookup table (LUT) formed thereon. The LUT is loaded with a LUT data set corresponding to an image subframe to be driven to the display. Successive LUT data sets corresponding to the next subframe are loaded after each subframe is driven to the display.
    Type: Grant
    Filed: November 19, 2001
    Date of Patent: June 1, 2004
    Assignee: Brillian Corporation
    Inventors: Douglas J. McKnight, Douglas J. Gorny, Lowell F. Bohn, Jr.
  • Method and apparatus for independent control of brightness and color balance in display and illumination systems
    Patent number: 6618031
    Abstract: A drive circuit for a time sequential color LED based display device allows the overall brightness of a display device to be adjusted without affecting the color balance. The circuit includes a boost switching converter, which provides constant power to each of a plurality of different colored LEDs associated with a pixel, independent of the forward voltage across each LED. The boost switching converter receives a pulse width modulated drive signal for activating each LED, when enabled, during a frame. The on-time of the drive signal varies during each frame according to which LED is to be activated at a particular point in time, to provide the appropriate power to the LED. The LEDs are enabled sequentially during a frame by separate enable signals. The cathode of each LED is connected to a positive power supply voltage when the LED is enabled.
    Type: Grant
    Filed: February 26, 1999
    Date of Patent: September 9, 2003
    Assignee: Three-Five Systems, Inc.
    Inventors: Lowell F. Bohn, Jr., Douglas J. McKnight
  • Time sequential lookup table arrangement for a display
    Patent number: 6373497
    Abstract: A method and apparatus employing lookup tables in a time sequential manner. A substrate has a display, a digital to analog converter, and a lookup table (LUT) formed thereon. The LUT is loaded with a LUT data set corresponding to an image subframe to be driven to the display. Successive LUT data sets corresponding to the next subframe are loaded after each subframe is driven to the display.
    Type: Grant
    Filed: May 14, 1999
    Date of Patent: April 16, 2002
    Assignee: Zight Corporation
    Inventors: Douglas J. McKnight, Douglas J. Gorny, Lowell F. Bohn, Jr.
  • Power partitioned miniature display system
    Patent number: 6326958
    Abstract: A system and method to reduce power consumption in a miniature display system. The system is formed on three distinct substrates with different feature sizes and operating in different power zones. The display controller and other high speed logic are formed on one substrate. The display, DACs and LUTs are formed on a second substrate, and high voltage circuitry for driving the LEDs and the cover glass voltage is formed on a third substrate.
    Type: Grant
    Filed: May 14, 1999
    Date of Patent: December 4, 2001
    Assignee: Zight Corporation
    Inventors: Douglas J. Gorny, Douglas J. McKnight, Lowell F. Bohn, Jr.