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Video refresh compression

  • US 5,835,082 A
  • Filed: 05/27/1997
  • Issued: 11/10/1998
  • Est. Priority Date: 12/27/1994
  • Status: Expired due to Term
First Claim
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1. A video refresh compression system comprising:

  • (a) rendering means for rendering pixel data to form at least one video frame wherein the video frame comprises a plurality of display data elements and each display data element comprises a plurality of pixel data, and wherein each of the plurality of display data elements are independently compressible with respect to each other;

    (b) a full frame buffer having an input coupled to receive and store the pixel data from the rendering means and an output for providing uncompressed display data elements;

    (c) a compressed frame buffer to store compressed display data elements having an input and an output;

    (d) a data compressor having an input coupled to the output from the full frame buffer to receive and compress display data elements and an output coupled to the input on the compressed frame buffer;

    (e) a data decompressor having an input coupled to the output from the compressed frame buffer and an output;

    (f) tag means having a plurality of valid bits settable responsive to the data compressor, for validating compressed display data elements stored in the compressed frame buffer;

    (g) display control circuitry, coupled and responsive to the tag means, to control sourcing of either uncompressed display data elements from the full frame buffer or compressed display data elements from the compressed frame buffer; and

    ,(h) a multiplexer having a first input coupled to the output from the full frame buffer, a second input coupled to the output from the data decompressor, a control input coupled to the display control circuitry, and an output for providing display data elements from the first and second inputs to form the video frame.

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