A display device comprising: a high-side potential variable-voltage source configured to output a high-side output potential; a plurality of pixels; a first power source wire connected between an output of the high-side potential variable-voltage source for outputting the high-side output potential and each pixel of the plurality of pixels; a plurality of monitor wires (191, 192, 193), each being connected to a corresponding high-side potential detecting point (M1, M2, M3) of a respective one of a plurality of monitor pixels (111M1, 111M2, 111 M3) of the plurality of pixels, the first power source wire applying at each high-side potential detecting point of the monitor pixels a respective high-side applied potential; a potential comparison circuit configured to measure via corresponding ones of the monitor wires (191, 192, 193) the high-side applied potentials applied at the detecting points (M1, M2, M3), to select the lowest potential among the measured potentials, and to output the selected potential to a high-side potential difference detecting circuit; the high-side potential difference detecting circuit, being configured to detect the potential difference between (i) the potential difference between the lowest potential selected by the potential comparison circuit and a reference potential and (ii) the high-side output potential; a signal processing circuit, being configured to regulate the high-side output potential outputted by the high-side potential variable-voltage source in accordance with the detected potential difference, such that a potential difference between the lowest potential selected by the potential comparison circuit and the reference potential is set to a predetermined potential difference. a high-side potential variable-voltage source configured to output a high-side output potential; a plurality of pixels; a first power source wire connected between an output of the high-side potential variable-voltage source for outputting the high-side output potential and each pixel of the plurality of pixels; a plurality of monitor wires (191, 192, 193), each being connected to a corresponding high-side potential detecting point (M1, M2, M3) of a respective one of a plurality of monitor pixels (111M1, 111M2, 111 M3) of the plurality of pixels, the first power source wire applying at each high-side potential detecting point of the monitor pixels a respective high-side applied potential; a potential comparison circuit configured to measure via corresponding ones of the monitor wires (191, 192, 193) the high-side applied potentials applied at the detecting points (M1, M2, M3), to select the lowest potential among the measured potentials, and to output the selected potential to a high-side potential difference detecting circuit; the high-side potential difference detecting circuit, being configured to detect the potential difference between (i) the potential difference between the lowest potential selected by the potential comparison circuit and a reference potential and (ii) the high-side output potential; a signal processing circuit, being configured to regulate the high-side output potential outputted by the high-side potential variable-voltage source in accordance with the detected potential difference, such that a potential difference between the lowest potential selected by the potential comparison circuit and the reference potential is set to a predetermined potential difference.