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Flat panel display drive circuit with switched drive current

  • US 5,387,844 A
  • Filed: 06/15/1993
  • Issued: 02/07/1995
  • Est. Priority Date: 06/15/1993
  • Status: Expired due to Term
First Claim
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1. A field emission display having a level of brightness, the display comprising:

  • a. a pixelator for field emission, the pixelator conducting a drive current, the drive current corresponding to the level of brightness;

    b. a resistor for providing a resistance between the pixelator and a node and for establishing the drive current, the resistor having a first value; and

    c. varying means for varying the resistance from the first value, the varying means enabled by a control signal, thereby varying the brightness in response to the control signal, wherein the varying means comprises;

    (1) a second resistor having a second value; and

    (2) a switch for connecting the resistor in parallel with the second resistor, the switch being enabled by the control signal.

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