Patent ID: 8384643
Filing Date: 2013-02-26
Classification: G09G

Abstract:
1. A drive circuit for driving a display panel having a plurality of scanning lines arranged in parallel to each other; a plurality of data lines arranged to cross the scanning lines and including a first data line and a second data line; and capacitance loads disposed in areas near cross points of the scanning lines and the data lines, comprising: a first operation amplifier for operating using a first power source voltage and a second power source voltage greater than the first power source voltage to generate an analog voltage with a negative polarity to be supplied to the capacitance loads; a second operation amplifier for operating using a third power source voltage and a fourth power source voltage greater than the third power source voltage to generate an analog voltage with a positive polarity to be supplied to the capacitance loads; a control unit for supplying a first control voltage and a second control voltage; and a switch circuit for switching the first operation amplifier from the first data line to the second data line according to the first control voltage, and for switching the second operation amplifier from the second data line to the first data line according to the second control voltage, said switch circuit including an n-channel type field effect transistor for connecting an output terminal of the first operation amplifier to the second data line, wherein said control unit is arranged to apply the first control voltage within a first voltage range smaller than a level greater than the second power source voltage by a threshold voltage of the n-channel type field effect transistor, and greater than the first power source voltage to a gate of the n-channel type field effect transistor, so that the n-channel type field effect transistor transits from a non-conductive state to a conductive state.