Patent ID: 8416171

Claim:
A driving circuit for driving a display panel, comprising: an output terminal connected to the display panel; an output circuit block including an output circuit capable of being connected with the output terminal; a spare output circuit block including a spare output circuit capable of being connected with the output terminal; an operational amplifier to be selectively used as one of a comparing circuit to compare an output signal from the output circuit with an output signal from the spare output circuit and a buffer circuit such that the buffer circuit is a voltage follower; a judging circuit to judge, based on a result of the comparison performed by the operational amplifier, whether or not the output circuit is defective; a connection switch to switch, if the judging circuit judges that the output circuit is defective, connecting the spare output circuit to the output terminal, instead of the output circuit; a memory to store a flag indicating the result of the judging performed by the judging circuit, and if the flag is of indicating that the output circuit is defective, the connection switch connects the spare output circuit with the output terminal, instead of the output circuit.