Patent ID: 6323850
Filing Date: 2001-11-27
Classification: G09G

Abstract:
A driving method for a liquid crystal device of the active matrix-type comprising a pair of substrates, a layer of liquid crystal having a spontaneous polarization disposed between the substrates so as to form two-dimensionally arranged pixels disposed along a plurality of rows and a plurality of columns, and a switching device disposed at each pixel so as to control a voltage applied to the liquid crystal at the pixel; said driving method comprising a frame operation including:dividing a scanning selection period for each selected row into a first period and a second period in a current frame,in the first period, applying a reset pulse having an amplitude V.sub.R and a pulse width t.sub.R to the liquid crystal at each pixel on the selected row, said reset pulse having a polarity opposite to that of a writing pulse voltage having an amplitude V.sub.W and a pulse width t.sub.W applied to the liquid crystal at the pixel in a previous frame, thereby resetting the pixels on the selected row to a first transmittance, andin the second period, applying a writing pulse having a prescribed amplitude and a prescribed pulse width to the liquid crystal at each pixel to establish a prescribed transmittance for current frame display at the pixel,wherein the reset pulse in the current frame has an absolute value of a product of the amplitude V.sub.R and the pulse width t.sub.R equal to an absolute value of a product of the amplitude V.sub.W and the pulse width t.sub.W of the writing pulse in the previous frame, at each pixel on the selected row.