Patent ID: 6924782

Claim:
A liquid crystal display device, comprising: a liquid crystal display panel; and a picture signal line driving circuit for supplying a picture signal voltage to the liquid crystal display panel, the picture signal line driving circuit comprising: a first output circuit for outputting a positive-polarity picture signal voltage, a second output circuit for outputting a negative-polarity picture signal voltage, and a switching circuit for switching the positive-polarity picture signal voltage supplied from the first output circuit and the negative-polarity picture signal voltage supplied from the second output circuit to a pair of picture signal lines and outputting the voltages, the switching circuit further including: a first switching element connected between the first output circuit and the first picture signal line of the picture signal line pair, a third switching element connected between the first output circuit and the second picture signal line of the picture signal line pair, a second switching element connected between the second output circuit and the second picture signal line, and a fourth switching element connected between the second output circuit and the first picture signal line, wherein a positive-polarity picture signal voltage supplied from the first output circuit is output to the first or second picture signal line by selectively turning on/off the first, second, third, and fourth switching elements, wherein a negative-polarity picture signal voltage supplied from the second output circuit is output to the second or first picture signal line by selectively turning on/off the first, second, third, and fourth switching elements, and wherein the switching elements are constituted by connecting a transistor at an output circuit side to whose gate electrode a control voltage is applied in series with a transistor at a picture signal line side to whose gate electrode a constant bias voltage is applied.