Liquid crystal apparatus

In a liquid crystal apparatus, comprising scanning electrodes and data electrodes intersecting each other to form a pixel at each intersection, a liquid crystal assuming a first optical state and a second optical state according to the polarity of a writing voltage applied thereto and disposed between the scanning electrodes and data electrodes, scanning-side drive means connected to the scanning electrodes, the improvement wherein:

• said scanning-side drive means includes means for supplying first and second scanning selection signals to the scanning electrodes, each of said first and second scanning selection signals having a voltage in a clear phase and a voltage in a write phase of mutually opposite polarities with respect to the voltage level of a non-selected electrode, the first and second scanning selection signals having voltages of mutually opposite polarities in each of the clear phase and the write phase with respect to the voltage level of a non-selected electrode, so that both the first and second scanning selection signals are applied to the scanning electrodes in one vertical scanning period, and a particular scanning electrode is supplied with both the first and second scanning selection signals in a first and a second vertical scanning period;
• said data-side drive means includes means for supplying data pulses to the data electrodes in synchronism with the first and second scanning selection signals;
• said scanning-side drive means and data-side drive means, in combination,
• (i) in the first vertical scanning period, applying to a first selected signal on a first scanning electrode a clearing voltage in the clear phase and then a first writing voltage so as to cause the first selected pixel to assume the first optical state in response to receiving the first scanning selection signal, and applying to a second selected pixel on a second scanning electrode a clearing voltage in the clear phase and then a second writing voltage so as to cause the second selected pixel to assume the second optical state in response to receiving the second scanning selection signal, and
• (ii) in the second vertical scanning period, applying a clearing voltage in the clear phase and then a first non-writing voltage of an opposite polarity to the first writing voltage to the first selected pixel on the first scanning electrode in response to receiving the second scanning selection signal, and applying a clearing voltage in the clear phase and then a second non-writing voltage of an opposite polarity to the second writing voltage to the second selected pixel on the second scanning electrode in response to receiving the first scanning selection signal.