PURPOSE: A power supply circuit of a liquid crystal display is provided to conduct a stable operation of the power supply circuit by blocking the inflow of the current outputted from a power supply terminal of a driving chip into an operational amplifier. CONSTITUTION: A voltage divider generates a divided voltage(VB) between a first voltage terminal(VDD) and a second voltage terminal(VSS2). An operational amplifier(624) receives the divided voltage and outputs a driving voltage. A first switch is connected between the first voltage terminal and a common node(N1) and forms a first current path between the common node and the first voltage terminal in response to the driving voltage. A second switch is connected between the second voltage terminal and the common node and forms a second current path between the common node and the second voltage terminal in response to the driving voltage. A first bipolar transistor(627) includes a first terminal connected to the first voltage terminal, a second terminal connected to the common node and a third terminal connected to the driving voltage.
