Method of and apparatus for driving ferroelectric liquid crystal display device
AssigneeCanon Kabushiki Kaisha
InventorHideyuki Kawagishi
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Abstract
A method and an apparatus of driving a ferroelectric liquid crystal display device are provided having N scanning electrodes, and M data electrodes arranged in the form of an N.times.M matrix, N and M being positive integers, and a pixel being formed at each intersection of the scanning electrodes and the data electrodes of the matrix. The method comprises the step of applying a selected scanning signal to a Kth selected scanning electrode in a time period, wherein K is a positive integer and K.ltoreq.N. A selected data signal is applied to a data electrode in the time period to form a synthetic voltage at a selected pixel, and an auxiliary signal voltage is applied to a (K-A) scanning electrode in the time period, wherein A is a positive integer and 1<A<N.
Claims24
A method of driving a ferroelectric liquid crystal display device having N scanning electrodes, and M data electrodes arranged in the form of an N.times.M matrix, N and M being positive integers, and a pixel being formed at each intersection of the scanning electrodes and the data electrodes of the matrix, said method comprising the steps of:
- applying a selected unipolar scanning signal to a Kth selected scanning electrode in a time period, wherein K is a positive integer and K.ltoreq.N;
- applying a selected data signal to a data electrode in the time period to form a synthetic voltage at a selected pixel;
- applying an auxiliary signal voltage polarized opposite to the selected unipolar scanning signal on the basis of a non-selected scanning signal to a (K-A) scanning electrode in the time period, wherein A is a positive integer and 1<A<N;
- and
- applying a non-selected scanning signal different from the auxiliary signal voltage to each of the remaining scanning electrodes in the time period.
An apparatus for driving and controlling a ferroelectric liquid crystal display device having N scanning electrodes and M data electrodes arranged in the form of an N.times.M matrix, N and M being positive integers, and a pixel being formed at each intersection of the scanning electrodes of the matrix, said apparatus comprising:
- first means applying a selected unipolar scanning signal to a Kth selected scanning electrode in a time period, wherein K is a positive integer and K.ltoreq.N;
- second means applying a selected data signal to a data electrode in the time period to from a synthetic voltage at a selected pixel;
- third means for applying an auxiliary signal voltage polarized opposite to the selected unipolar scanning signal on the basis of a non-selected scanning signal to a (K-A) scanning electrode in the time period, wherein A is a positive integer and 1<A<N;
- and
- fourth means for applying a non-selected scanning signal different from the auxiliary signal voltage to each of the remaining scanning electrodes.
A method of driving a ferroelectric liquid crystal display device having N scanning electrodes, and M data electrodes arranged in the form of an N.times.M matrix, N and M being positive integers, and a pixel being formed at each intersection of the scanning electrodes and the data electrodes of matrix, said method comprising the steps of:
- applying a selected unipolar scanning signal of a first frequency to a Kth selected scanning electrode line in a time period, wherein K is a positive integer and K<N;
- applying a selected data signal to a data electrode in the time period to form a synthetic voltage at a selected pixel;
- applying an auxiliary signal voltage polarized opposite to the selected unipolar scanning signal on the basis of a non-selected scanning signal of the frequency to a (K-A) scanning electrode in the time period, wherein A is a positive integer and A<N;
- and
- applying a non-selected scanning signal different from the auxiliary signal voltage to each of the remaining scanning electrodes.
An apparatus for driving and controlling a ferroelectric liquid crystal display device having N scanning electrodes and M data electrodes arranged in the form of an N.times.M matrix, N and M being positive integers, and a pixel being formed at each intersection of the scanning electrodes of the matrix, said apparatus comprising:
- first means applying a selected unipolar scanning signal of a frequency to a Kth selected scanning electrode in a time period, wherein K is a positive integer and K<N;
- second means applying a selected data signal to a data electrode in the time period to form a synthetic voltage at a selected pixel;
- third means for applying an auxiliary signal voltage polarized opposite to the selected unipolar scanning signal on the basis of a non-selected scanning signal of the frequency to a (K-A) scanning electrode in the time period, wherein A is a positive integer and A<N;
- and
- fourth means for applying a non-selected scanning signal different from the auxiliary signal voltage to each of the remaining electrodes.
Dependencies are inferred from the claim text.