Abstract: A liquid crystal display device comprises: a liquid crystal module including liquid crystal display panel having a plurality of liquid crystal picture elements arranged in a matrix form, and driving circuits for applying driving signals to signal electrodes and to scanning electrodes of the liquid crystal display panel, respectively; a control circuit for controlling operations of the liquid crystal module; and a means for inverting polarity of a voltage to be applied to a liquid crystal layer by generating a control signal M' having a period m.tau. which signal inverts the polarity of the voltage to be applied to the liquid crystal layer whenever a clock signal having a period .tau. is counted a predetermined number m/2. However, if a period of a frame frequency is n.tau. and an arbitrary integer is L,(1) m is set to be 2n/(2L-1), or(2) m is set to be n/L and the control signal M' is inverted per said frame period n.tau.

Abstract: A liquid crystal display device comprising a liquid crystal module including liquid crystal display panel having a plurality of liquid crystal picture elements arranged in a matrix form, and driving circuits for applying driving signals to signal electrodes and to scanning electrodes of the liquid crystal display panel, respectively; a control circuit for controlling the operation of the liquid crystal module; a first circuit for dividing frequency of a timing signal given by the control circuit and producing a first signal of lower frequency; and a second circuit for inverting the first signal of lower frequency once per frame period and generating a second signal to reverse the polarity of voltages applied to liquid crystal display elements with its period .tau..sub.M" satisfying the inequality2.0.ltoreq..tau..sub.F (the frame period)/.tau..sub.M" .ltoreq.6.0.

Abstract: Between a liquid crystal module and a control circuit for controlling said liquid crystal module, there are provided that a counter circuit for counting down a timing signal given by said control circuit and an exclusive-OR circuit whose inputs are square wave pulses delivered from said counter circuit and square wave pulses given by said control circuit with a period of twice the frame period. The polarity of voltages applied to liquid crystal module is reversed by square wave pulses delivered from the exclusive-OR circuit with frequency higher than the frame frequency.