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Color display control apparatus for controlling display gray scale of each scanning frame or each plurality of dots

  • US 5,552,800 A
  • Filed: 08/23/1994
  • Issued: 09/03/1996
  • Est. Priority Date: 08/09/1990
  • Status: Expired due to Term
First Claim
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1. A color panel display control system for a display screen having a plurality of dots, the column panel display control system comprising:

  • a color panel display device having a predetermined number of gray scale levels for each of specified primary colors;

    a CRT controller for outputting display data representing the primary colors and display timing signals to control the color panel display device;

    RAMDAC means for converting the display data output from the CRT controller into R-, G-, and B-data; and

    color panel display controller means having;

    means for receiving the R-, G-, and B-data from the RAMDAC means, for generating each of R-, G-, and B-base gray-scale data and each of R-, G- and B-next gray-scale data from the received R-, G-, and B-data, wherein the R-, G-, and B-base gray-scale data and the R-, G- and B-next gray-scale data are predetermined by voltage levels associated with the dots of the display screen, and for generating a frame rate duty cycle from a vertical sync signal, dot pattern data from a horizontal sync signal and a dot clock signal; and

    frame rate control means for displaying intermediate gray-scale levels between the R-, G-, and B-base gray-scale data and the R-, G-, and B-next gray-scale data by selectively providing, using a number of the frame rate duty cycle and the dot pattern data, the R-, G-, and B-base gray-scale data and the R-, G-, and B-next gray-scale data on a certain dot of the display screen.

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