Patents by Inventor Harry Pan

Harry Pan 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).

  • Service switch for video display apparatus
    Patent number: 4731564
    Abstract: A vertical deflection circuit for a video display apparatus includes a service switch that collapses vertical or field rate scan in order to facilitate adjustment of cathodes ray tube electron beam drive levels. The service switch operates by referencing the vertical sawtooth signal generator, the AC feedback, and the DC feedback to ground potential so that no input is applied to the vertical drive circuitry.
    Type: Grant
    Filed: May 12, 1986
    Date of Patent: March 15, 1988
    Assignee: RCA Corporation
    Inventors: Harry Pan, Ching L. Yu
  • Phase correction arrangement for deflection circuit
    Patent number: 4584503
    Abstract: A circuit for use in a video display apparatus corrects raster shift due to beam current variations. A horizontal retrace related pulse is applied to the ramp generator for the horizontal deflection phase control circuit, causing the retrace AC zero crossing of the ramp to shift under high beam current conditions. The phase control circuit then shifts the ramp signal to center the synchronizing pulses about the zero crossing, resulting in a raster shift which compensates for the raster shift introduced due to beam current variations.
    Type: Grant
    Filed: January 23, 1984
    Date of Patent: April 22, 1986
    Assignee: RCA Corporation
    Inventor: Harry Pan