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System and methods for driving an electrooptic device

  • US 20020158857A1
  • Filed: 02/05/2002
  • Published: 10/31/2002
  • Est. Priority Date: 11/30/2000
  • Status: Active Grant
First Claim
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1. A drive circuit of an electrooptic device that supplies a display portion wherein pixels are constructed in a matrix shape out of an electrooptic material whose transmission factor for light is variable by application of a voltage, with an ON voltage capable of saturating the transmission factor or an OFF voltage capable of bringing the electrooptic material into a non-transmissive state, thereby to implement subfield drive in which a gradation is expressed in accordance with states of a light transmissive state and the non-transmissive state of the electrooptic material in a unit time, and a time ratio of the states, comprising:

  • drive means for setting as control units a plurality of subfields into which a field period is divided on a time base, for setting a time period of each of the subfields to be shorter than a saturation response time which is required for saturating the transmission factor of the electrooptic material in the case of applying the ON voltage, and for determining on the basis of display data the subfields to apply the ON voltage therein and the subfields to apply the OFF voltage therein, thereby to express the gradation.

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