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Display control device for use with flat-panel display and color CRT display

  • US 5,491,496 A
  • Filed: 05/02/1994
  • Issued: 02/13/1996
  • Est. Priority Date: 07/31/1991
  • Status: Expired due to Fees
First Claim
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1. A display control device for controlling a color CRT display and a monochrome flat-panel display with 2m gradations, comprising:

  • color table means having a plurality of color registers for holding color data for one pixel of said color CRT display, one of said color registers being selected by display data having color information;

    supply means for converting R, G, B color data held by the selected register of the color table means into analog color video signals and for supplying the converted video signals to said color CRT display;

    summing-colors-to-gray-scale means for converting the intensity value found for each of the color data R, G, and B written into the selected color registers of the color table means into its corresponding gray scale value of n bits (n>

    m);

    forming means for adding a predetermined value to first gradation data represented by the high-order m bits of the n-bit gray scale value (n>

    m) converted by the summing-colors-to-gray-scale means so as to form a set of second gradation data of m bits;

    selecting means connected to each of said set of forming means and said flat panel display for selecting one of said first gradation data and said set of second gradation data in accordance with a select signal for each of a plurality of dots constituting one pixel of a flat panel display device and for supplying the selected data to said flat panel display; and

    select signal generating means connected to said selecting means for generating said select signal denoting assignment of the selected data to said plurality of dots in accordance with the value of the low-order n-m bits of the first gradation data.

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