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Television signal projection system and method of using same

  • US 5,276,436 A
  • Filed: 11/19/1990
  • Issued: 01/04/1994
  • Est. Priority Date: 07/21/1988
  • Status: Expired due to Term
First Claim
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1. A high speed color display unit for interfacing one of a plurality of video signal producing devices with a high speed display, said devices generating different types of video signals including a television signal and a computer video signal, comprising:

  • microprocessor means for selecting a desired one of said plurality of video signal producing devices to be interfaced with the high speed display;

    signal conversion means responsive to the television signal for producing an analog signal indicative of a plurality of pixel images arranged in successive frames of full color video images;

    analog to digital conversion multiplexing means responsive to said microprocessor means for converting selectively the signal from the desired one of the video signal producing devices into a plurality of pixel image digital signals indicative of the full color video images each one of said pixel image digital signals having N bits of digital information;

    quantizing means responsive to said plurality of pixel image digital signals for quantizing said pixel image digital signals without introducing any substantial quantization errors, said digital signals being quantized into averaged pixel color shading level signals having M bits of digital information, where M is substantially smaller than N;

    bit map memory means for storing the quantized pixel image digital signals temporarily;

    means for generating pixel clock signals, said pixel clock signals having a predetermined high rate, where said high rate is a sufficient pixel clock rate for the high speed display device;

    means responsive to the pixel clock signals for retrieving the quantized pixel image digital signals;

    signal generator means responsive to said pixel clock signals for producing a series of color shading level averaging signals arranged in recurring groups of said color shading level averaging signals; and

    means of comparing individual ones of the retrieved quantized pixel image digital signals and individual corresponding ones of said color shading level averaging signals to develop an output signal to cause the high speed display device to produce individual ones of said plurality of pixel images whenever the value of the quantized pixel image digital signal is at least equal to the value of said corresponding color shading level averaging signal, whereby the average intensity level for each pixel image over a large number of successive frames closely approximates a desired pixel image shading level without introducing any substantial contouring or flicker.

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