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System and method for producing a palette of many colors on a display screen having digitally-commanded pixels

  • US 5,298,915 A
  • Filed: 06/16/1992
  • Issued: 03/29/1994
  • Est. Priority Date: 04/10/1989
  • Status: Expired due to Term
First Claim
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1. An apparatus for controlling a pixel on a digitally commanded display to produce a mixed color, the pixel having a positional value within an array of pixels on the digitally commanded display, wherein the mixed color is formed from specified primary colors, each having a specified brightness, and wherein the pixel comprises a plurality of colored sub-pixels, each of which provides a different one of the specified primary colors, the apparatus including:

  • programmable control means for controlling each sub-pixel using a frame rate duty cycle approach to produce a programmable number N of time averaged brightnesses over N consecutive frames, such that the sub-pixel is commanded by a pixel drive signal to be either ON or OFF during each frame of the N consecutive frames, the programmable control means comprising;

    brightness waveform memory means for storing a plurality of brightness waveforms wherein a command value from one of the plurality of stored brightness waveforms is selected in response to a phase value signal and is supplied as the pixel drive signal to command the sub-pixel to be either ON or OFF;

    addressing means for determining the positional value of the pixel within the array and a current frame number, and for supplying the positional value and the current frame number as outputs; and

    means for providing the phase value signal as a function of a modulo-N operation on a sum of the positional value and current frame number.

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