Driving method for liquid crystal device
First Claim
1. 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 VR and a pulse width tR 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 VW and a pulse width tW applied to the liquid crystal at the pixel in a previous frame, thereby resetting the pixels on the selected row to a first transmittance, and in 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 VR and the pulse width tR equal to an absolute value of a product of the amplitude VW and the pulse width tW of the writing pulse in the previous frame, at each pixel on the selected row.
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Abstract
A liquid crystal device of the active matrix-type having two-dimensionally arranged pixels along rows and columns is driven frame by frame. In each frame operation, a scanning selection period (TG) for each selected row is divided into a first period (t1) and a second period (t2). In t1 of a current frame (TF2), a reset pulse is applied to a pixel concerned, and the reset pulse is set to have an absolute value of voltage identical to and a polarity opposite to those of a writing pulse voltage applied to the pixel in the previous frame (TF1). Then, in t2 of the current frame (TF2), the pixel is supplied with a writing pulse depending on a prescribed display state of the pixel for the current frame. As a result, the reset period is shortened to favor a high-speed display and a higher resolution display.
52 Citations
9 Claims
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1. 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 VR and a pulse width tR 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 VW and a pulse width tW applied to the liquid crystal at the pixel in a previous frame, thereby resetting the pixels on the selected row to a first transmittance, and in 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 VR and the pulse width tR equal to an absolute value of a product of the amplitude VW and the pulse width tW of the writing pulse in the previous frame, at each pixel on the selected row. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- said driving method comprising a frame operation including;
Specification