The object of the present invention is to decrease a frame size in a case where data lines are driven by using a demultiplexer. The data lines 114 are divided into groups each having three data lines. TFTs 52 and 54 are provided for each data line 114, and the TFT 52 between the TFTs has a source electrode commonly connected in each group and a drain electrode connected to the data line 114. In addition, the TFT 54 has a source electrode connected to the data line 114 and a drain electrode commonly connected in each group. A data signal output circuit 32 that outputs data signals having voltage values in accordance with gray scale levels of sub-pixels corresponding to intersections of a selected scan line and a selected data line in each group to each group. Since the selected data line 114 is connected to an inverting input terminal of an operational amplifier 34 through the TFT 54, the operational amplifier 34 controls the voltage of the data line 114 to be identical to the voltage of a signal output from the data signal output circuit.