Patent ID: 6864871

Claim:
An active-matrix liquid crystal display apparatus comprising: an active-matrix substrate including a plurality of scanning electrode lines, a plurality of data electrode lines, pixel electrodes and switching elements, the pixel electrodes being respectively connected to intersections of the plurality of scanning electrode lines and the plurality of data electrode lines via the switching elements; a counter electrode substrate including a counter electrode formed thereon, the counter electrode being opposed to the pixel electrodes; a liquid crystal sandwiched between the active-matrix substrate and the counter electrode substrate; the active-matrix substrate further including supplementary capacitance lines which are formed in parallel to the scanning electrode lines, and supplementary capacitances for holding display data which are connected between the pixel electrodes and the supplementary capacitance lines, the apparatus further comprising: a supplementary capacitance drive circuit for driving the supplementary capacitance lines based on a voltage applied to the counter electrode so that a predetermined potential difference between the voltage applied to the counter electrode and a voltage applied to the pixel electrodes which voltages are different from each other is always maintained when any of the pixel electrodes and supplementary capacitances leaks.