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Method and apparatus for gray-scale gamma correction for electroluminescent displays

  • US 20040090402A1
  • Filed: 11/04/2003
  • Published: 05/13/2004
  • Est. Priority Date: 11/04/2002
  • Status: Abandoned Application
First Claim
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1. A gray scale reference voltage generator for connection to column drivers of a thick dielectric electroluminescent display, comprising:

  • a counter for receiving gray level data from an incoming video signal and in response counting for a time interval proportional to said gray level data; and

    a non linear voltage ramp connected to said counter for generating a ramping voltage for application to said column drivers during said time interval, wherein said ramping voltage conforms to a curve having an inverted s-shape, with an initial convex portion followed by a concave portion so as to compensate for luminance versus voltage characteristics of said thick dielectric electroluminescent display.

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