Patent ID: 8665201

Claim:
A display device comprising: a display panel including a plurality of scan signal lines, a plurality of data signal lines, a plurality of pixel electrodes, and a plurality of transistors each of which (i) is connected to a corresponding one of the plurality of scan signal lines, a corresponding one of the plurality of data signal lines and a corresponding one of the plurality of pixel electrodes and (ii) is turned on/off by a scan signal supplied via the corresponding one of the plurality of scan signal lines; a plurality of signal line driving circuits including at least one of (1) a plurality of first signal line driving circuits, which share scan signal lines to which they are connected and (2) a plurality of second signal line driving circuits, which share data signal lines to which they are connected; judging means for judging, whether or not at least one of the plurality of signal line driving circuits has a failure, on the basis of timing at which its output signal is outputted from a corresponding one of the plurality of signal line driving circuits; switching means for switching over to another one of the plurality of signal line driving circuits, having no failure, in a case where the judging means judges that at least one of the plurality of signal line driving circuits has a failure; and counting means for counting number of times by which the judging means determines that timing, at which an output signal is outputted from a signal line driving circuit, is not normal, wherein the judging means determines that a signal line driving circuit has a failure in a case where counting of counted by the counting means for the signal line driving circuit reaches a predetermined number of times.