Patent ID: 8310477

Claim:
A power circuit for a liquid crystal display, comprising: a voltage divider which generates a voltage-divided voltage between a first power source and a second power source; an operational amplifier which receives the voltage-divided voltage to output a driving voltage; a first switch connected between the first power source and a common node to provide a first current path between the first power source and the common node in response to the driving voltage received to a control terminal; a second switch connected between the second power source and the common node to provide a second current path between the second power source and the common node in response to the driving voltage received to a control terminal; a first resistor connected between a output terminal of the operational amplifier and the control terminal of the first switch; and a second resistor connected between the output terminal of the operational amplifier and the control terminal of the second switch, wherein the operational amplifier has a first input terminal connected to the voltage-divided voltage and a second input terminal connected to the common node.