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Method for driving a ferroelectric liquid crystal displays and bias voltage circuit therefor

  • US 5,343,217 A
  • Filed: 01/14/1993
  • Issued: 08/30/1994
  • Est. Priority Date: 04/30/1992
  • Status: Expired due to Fees
First Claim
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1. A method for driving a ferroelectric liquid crystal displays which have a plurality of cells in matrix driving mode comprising the steps of:

  • supplying a first composite voltage of a first polarity during the first half of pixel period, and supplying a second composite voltage of a second polarity which changes the alignment of the liquid crystal into a first state during the latter half of pixel period, to the liquid crystal cell which exists in the selected line and displays a first data;

    supplying a third composite voltage of said first polarity which changes the alignment of the liquid crystal cell into a second state during the first half of pixel period, and supplying a fourth composite voltage of the second polarity which doesn'"'"'t change the alignment of the liquid crystal cell during the latter half of pixel period, to the liquid crystal cell which exists in the selected line and displays the second data; and

    supplying a fifth composite voltage of said first polarity which doesn'"'"'t change the alignment of the liquid crystal during the first half of pixel period, and supplying a sixth composite voltage of said second polarity which doesn'"'"'t change the alignment of the liquid crystal during the latter half of pixel period, or supplying sixth composite voltage during the first half of pixel period and supplying said fifth composite voltage during the latter half of pixel period, in dependence upon the data displayed, to the crystal cell which exists in the non-selected line, wherein said fourth composite voltage is -2 Vd, provided that said sixth composite voltage is -Vd.

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