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Four-level voltage supply for liquid crystal display

  • US 4,050,064 A
  • Filed: 05/11/1976
  • Issued: 09/20/1977
  • Est. Priority Date: 05/14/1975
  • Status: Expired due to Term
First Claim
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1. Voltage supply circuitry for supplying to a liquid crystal display first, second and third voltage levels in addition to a reference level, comprising:

  • first and second input terminals, the first input terminal being connected to the first voltage level and the second input terminal being connected to the reference level;

    first, second, third, fourth and fifth output terminals for providing desired voltage levels to the liquid crystal display;

    impedance means interposed between the first input terminal and the second input terminal for producing the second and third voltage levels;

    connection means for always providing the first and reference levels to the first output terminal and the fifth output terminal respectively; and

    switching means for selectively providing the first, second, third and reference voltage levels to the second, third and fourth output terminals.

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