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System for simultaneous display of multiple video windows on a display device

  • US 5,642,498 A
  • Filed: 04/12/1994
  • Issued: 06/24/1997
  • Est. Priority Date: 04/12/1994
  • Status: Expired due to Term
First Claim
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1. A device for simultaneous display of multiple secondary video windows overlapping with a primary video window, comprising:

  • primary interface means for receiving a primary video signal for display in a primary window and for outputting primary pixel values representing said primary window;

    a primary storage memory for receiving and storing said primary pixel values representing said primary video window;

    secondary interface means for receiving a plurality of secondary video signals for display in a plurality of secondary windows and for outputting secondary pixel values representing said secondary video windows;

    a secondary storage memory for receiving and storing said secondary pixel values representing said secondary video windows, wherein, for a predetermined number of pixels, said secondary storage memory stores secondary pixel values corresponding to the pixel values in said primary storage memory;

    selection means coupled to the secondary interface means and to the secondary storage means for selecting one of the plurality of secondary video signals and sending the corresponding secondary pixel values to the secondary storage memory;

    output timing means coupled to said primary and secondary storage memories for causing the simultaneous output of a given primary pixel value from said first primary storage memory to be displayed at a first screen location with a corresponding secondary pixel value from said secondary storage memory to be displayed at the same first screen location; and

    output selecting means coupled to said primary and secondary storage memories for assembling said primary and secondary video windows by selecting and displaying one of said simultaneously output pixel values.

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