Patent ID: 7038648

Claim:
A method for driving a liquid crystal display which comprises liquid crystal which exhibits a cholesteric phase at room temperature, a plurality of scanning electrodes and a plurality of signal electrodes which face and cross each other with the liquid crystal in-between and which makes a display by using selective reflection of the liquid crystal in a cholesteric phase, said method comprising a step of: applying pulse driving voltages to the liquid crystal by sending data signals in accordance with an image to be displayed to the plurality of signal electrodes while sending a selection signal to the plurality of scanning electrodes in a specified order, wherein: the driving voltage applying step comprises a reset step of applying reset pulses to reset the liquid crystal to a homeotropic state, a selection step including a selection pulse application step of applying selection pulses to select the final state of the liquid crystal and an evolution step of applying evolution pulses to cause the liquid crystal to evolve to the selected state; the data signal is variable within a range under a threshold value to change the state of the liquid crystal; the selection signal comprises a chain of pulses to generate the reset pulses, the selection pulses and the evolution pulses; the scanning electrodes includes at least one set of scanning electrodes which are to be serially scanned, in scanning of the set of scanning electrodes, a delay step being inserted between the selection pulse application step of a previously scanned scanning electrode and the selection pulse application step of a later scanned scanning electrode; a length of the selection step and a length of the selection pulse application step are changed in accordance with circumstantial temperature; and a ratio of the length of the selection pulse application step to the length of the selection step is changed in accordance with circumstantial temperature.