Method of driving a ferroelectric liquid crystal matrix panel

Claim 1

A method of driving a liquid crystal matrix panel for realizing a desired light transmission state, in a liquid crystal matrix panel for forming pixels arranged in a matrix by interposing a ferrodielectric liquid crystal between a pair of substrates having scanning and signal lines on confronting surfaces, by applying to the pixels a first pulse voltage group possessing a sufficient voltage value and pulse width for setting all pixels selected by a desired scanning line in a reset period of the scanning line in one of either a "bright" or a "dark" state regardless of a voltage applied to a signal line, and either inverting or maintaining the same state by a display data by a second pulse voltage group applied to the pixels in a selection period; wherein the application period of the first pulse voltage group is at least an integer multiple of 2 of the application period of the second pulse voltage group; wherein the first pulse voltage group consists of a first half pulse voltage group and a second half pulse voltage group, and wherein when one of the first half and second half pulse voltage groups contains a first voltage pulse whose absolute value of voltage is at least equal to an absolute value of a threshold voltage of the liquid crystal, said one of the first half and second half pulse voltage groups also contains a second voltage pulse whose absolute value of voltage is smaller than the absolute value of the threshold voltage of the liquid crystal and whose polarity is opposite to that of the first voltage pulse, said second voltage pulse being applied immediately before said first voltage pulse in the first half pulse voltage group and immediately after said first voltage pulse in the second half pulse voltage group.

Claim 2

A method of driving a liquid crystal matrix panel for realizing a desired light transmission state, in a liquid crystal matrix panel for forming pixels arranged in a matrix by interposing a ferrodielectric liquid crystal between a pair of substrates having scanning and signal lines on confronting surfaces, by applying to the pixels a first pulse voltage group possessing a sufficient voltage value and pulse width for setting all pixels selected by a desired scanning line in a reset period of the scanning line in one of either a "bright" or a "dark" state regardless of a voltage applied to a signal line, and either inverting or maintaining the same state by a display data by a second pulse voltage group applied to the pixels in a selection period; wherein the application period of the first pulse voltage group is at least an integer multiple of 2 of the application period of the second pulse voltage group; wherein the first pulse voltage group consists of a first half pulse voltage group and a second half pulse voltage group, and wherein when one of the first half and second half pulse voltage groups contains a first voltage pulse whose absolute value of voltage is at least equal to an absolute value of a threshold voltage of the liquid crystal, said one of the first half and second half pulse voltage groups also contains a second voltage pulse whose absolute value of voltage is smaller than the absolute value of the threshold voltage of the liquid crystal and whose polarity is opposite to that of the first voltage pulse, said second voltage pulse being applied immediately before said first voltage pulse in the first half pulse voltage group and immediately after said first voltage pulse in the second half pulse voltage group.