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Matrix panel with an active driving system

  • US 4,591,848 A
  • Filed: 03/31/1983
  • Issued: 05/27/1986
  • Est. Priority Date: 04/01/1982
  • Status: Expired due to Term
First Claim
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1. An active driving system for a liquid crystal matrix panel, having a plurality of cells each including a transistor for switching the cell on and off during selected and non-selected periods respectively and a picture element, said matrix panel receiving an external video signal adapted to a cathode ray tube display and a frame signal, the active driving system comprising:

  • inverter means for inverting the polarity of the external video signal;

    scaling means coupled to the inverter means for symmetrically amplifying the inverted video signal to produce two negative-video signals having bias voltages and amplitudes which are symmetrical to a common voltage level; and

    selector means coupled to the scaling means for producing a composite negative-video signal by alternating selecting the two negative-video signals.

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