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Driving method for optical modulation device

  • US 4,932,759 A
  • Filed: 12/23/1986
  • Issued: 06/12/1990
  • Est. Priority Date: 12/25/1985
  • 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 opposite to and intersecting with the signal electrodes, and an optical modulation material disposed between the scanning electrodes and the signal electrodes, having a pixel at each intersection of the scanning electrodes and the signal electrodes so as to form a matrix of pixels and exhibiting contrast depending on the magnitude and polarity of a voltage applied to each pixel of the matrix;

  • said driving method comprising the step of writing on respective pixels on a selected scanning electrode in a writing period defined by application of a scanning selection signal voltage to the selected scanning electrode, the writing period comprising a former half period and a latter half period which is subsequent to the former half period, the former half period comprising a first state-determining phase for causing a selected one of the respective pixels on the selected scanning electrode to assume one optical state of two optical states and a first auxiliary phase prior to the first state-determining phase for causing the selected one of the respective pixels to assume a second optical state, and the latter half period comprising a second state-determining phase for causing at least a remaining non-selected one of the respective pixels on the selected scanning electrode to assume the second optical state and a second auxiliary phase prior to the second state-determining phase for causing the remaining non-selected pixels to assume the one optical state, and supplying both the pixel selected in the latter half period and the pixels non-selected in the former half period with an alternating voltage to maintain their optical state.

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