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Method and apparatus for driving optical modulation device

  • US 4,925,277 A
  • Filed: 09/06/1989
  • Issued: 05/15/1990
  • Est. Priority Date: 09/17/1986
  • Status: Expired due to Term
First Claim
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1. A driving method for an optical modulation device comprising scanning electrodes and signal electrodes disposed intersecting with each other to form pixels having a ferroelectric liquid crystal thereinbetween, the driving method comprising:

  • providing the scanning electrodes with three potential levels, V1, V2, and V3, which satisfy the relation V1 >

    V2 >

    V3 ;

    providing the signal electrodes with two potential levels, V4 and V5, and satisfy the relation V4 >

    V5, wherein the potentials V1, V2, V3, V4 and V5 are set to satisfy the relations V1 -V3 =V4 -V5, and V4 -V2 =(V1 -V3)/2;

    simultaneously bringing all the pixels on one of the scanning electrodes to a first stable state; and

    converting only selected pixels on the one scanning electrode to a second stable state, wherein the potential level V4 is provided after the potential level V1, and in synchronism with the potential level V3 to signal electrodes corresponding to the selected pixels on the one scanning electrode, and wherein the potential level V5 is provided after the potential level V1, and in synchronism with the potential level V3 to signal electrodes corresponding to the non-selected pixels on the one scanning electrode.

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