Patent ID: 6052106
Filing Date: 2000-04-18
Classification: G09G

Abstract:
A method for controlling a matrix panel in which each of a plurality of picture elements includes an electro-optical bistable cell with a ferroelectric liquid crystal, the bistable cell switching between a first state and a second state in response to spaced apart rectangular switching pulses having alternately opposite polarities and a constant rms voltage amplitude Vhf applied between the spaced apart rectangular switching pulses, when the switching pulses have a large enough product of a switching pulse time and a switching pulse voltage to have a minimum value Amin when the switching pulse voltage ranges from one to eight tenths of a minimum voltage Vtmin that allows a minimum switching pulse time, the method comprising:applying a selection voltage waveform to at least one bistable cell, the selection voltage waveform includinga first voltage pulse of a first polarity,an interruption including one or more voltages of a second polarity opposite the first polarity, such that an absolute value of the time integral of the one or more voltages is in the range of 0.05 Amin to 1 Amin anda second voltage pulse of the first polarity, such that an absolute value of a time integral of the second voltage pulse is in the range of 0.2 Amin to 5 Amin and is greater than the absolute value of the time integral of the one or more voltages occurring during the interruption,so as to produce a control time window for the at least one bistable cell that includes a time intervalcorresponding to the occurrence of the one or more voltages during the interruption, andextending in total for at least one fifth and not more than four fifths of an entire duration of the control time window; andapplying a data voltage waveform to the at least one bistable cell during the control time window.