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Liquid crystal apparatus

  • US 5,818,408 A
  • Filed: 05/25/1995
  • Issued: 10/06/1998
  • Est. Priority Date: 11/12/1987
  • Status: Expired due to Fees
First Claim
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1. A display apparatus, comprising:

  • a display panel comprising scanning electrodes and data electrodes intersecting the scanning electrodes so as to form a pixel at each intersection of the scanning electrodes and data electrode;

    a scanning electrode drive circuit including an address decoder and a scanning electrode driver; and

    a data electrode drive circuit including a shift register, a line memory and a data electrode driver, wherein;

    said address decoder is operated to divide one frame into a plurality of fields including a field wherein a prescribed number of mutually non-adjacent scanning electrodes are selected, and another field wherein a prescribed number of mutually non-adjacent scanning electrodes, selected from and constituting at least a portion of the remaining scanning electrodes, are selected,said scanning electrode driver is operated to supply a scanning selection signal comprising a unipolar first pulse and a unipolar second pulse having a polarity opposite to that of, and a pulse width shorter than, that of the first pulse within a selection period for one scanning electrode, andsaid data electrode driver is operated to supply data signals comprising a third pulse of one polarity, and fourth and fifth pulses each of the opposite polarity placed before and after the third pulse and each having a pulse width shorter than the third pulse in the selection period, so that pixels on a selected scanning electrode are once uniformly reset into either a bright or a dark state and then placed in display states which are determined depending on whether the reset bright or dark state is retained or inverted, all within the selection period.

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