Liquid-crystal indicator driving system

A liquid crystal indicator driving system comprises a liquid crystal indicator with opposed electrodes and a liquid crystal filling between the electrodes. A first voltage source is provided to apply a voltage of one polarity between the opposed electrodes, and a second voltage source is provided to apply a voltage of the other polarity between the opposed electrodes. Means is provided to drive the liquid crystal indicator from the first voltage source during at least the operation result indicating period in one operating cycle and to drive the liquid crystal indicator from the second voltage source except when the indicator is driven from the first voltage source. The two voltage sources may be replaced by a single voltage source, the voltage of which may be changed over a polarity by a switching circuit.