Patents by Inventor John Evert Meyer

John Evert Meyer 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).

  • Brightness control in an LED display device
    Patent number: 4099171
    Abstract: The brightness of given LED segments of each digit section of an LED display device for providing illuminated displays of selected alphanumeric characters is controlled by controlling the amount of energy provided to each given digit section for illumination of the given LED segments in accordance with the selection of the character to be displayed by the given digit section. For example, when a character having only three illuminated segments, such as a "7" is displayed, less current is provided to the digit section than when a character having six illuminated segments, such as a "0" is displayed, thereby providing an apparent uniform brightness as to both characters.
    Type: Grant
    Filed: January 28, 1977
    Date of Patent: July 4, 1978
    Assignee: National Semiconductor Corporation
    Inventor: John Evert Meyer