A drive circuit (20) of the present invention includes an output circuit block (30), a spare output circuit block (40), a reference output circuit block (41), a comparing and determining circuit (50), and switching circuits (60) and (61). During self-detection, the switching circuit (60) selects one output circuit from the output circuit block (40), disconnects the selected output circuit from a data line of a display panel (80), and connects the spare output circuit block (40) to the data line of the display panel (80). The comparing and determining circuit (50) compares a test output signal from the selected output circuit with a reference output signal from the reference output circuit block (41) and, in accordance with a result of the comparison, determines whether or not the selected output circuit is defective or not. This achieves a drive circuit capable of detecting a failure in an output circuit while driving a display panel without causing a defect in display.
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