An active matrix type display device, comprising: pixels arranged in matrix, each including a current-driven type light emitting element and a transistor adapted to control a current of the current-driven type light emitting element to perform display; horizontal power supply lines (PVDDm-4 to PVDDm+11) arranged in a horizontal direction, adapted to supply a current to pixels in respective corresponding horizontal lines; and switches adapted to connect each group of the horizontal power supply lines, the each group including at least one horizontal power supply line, to one of a pixel lighting power supply line (a, PVDDa), a pixel data writing power supply line (b, PVDDa) and to an opened state (c) in a switchable manner, the pixel lighting power supply line and the pixel data writing power supply line i) being disposed outside a pixel region and ii) the pixel data writing power supply line (PVDDb) having a voltage lower than the lighting voltage on the pixel lighting power supply line (PVDDa), wherein: - a first group of said horizontal power supply lines (PVDDm+4 to PVDDm+7), to which a pixel to be measured belongs, is supplied with power from the pixel lighting power supply line so as to measure a first current (iPVDDa) of each pixel in the first group, - a second group of said horizontal power supply lines (PVDDm to PVDDm+3), to which other pixels than the pixel to be measured belong, is supplied with power from the pixel data writing power supply line so as to measure a second current (iPVDDb) in each pixel in the second group, and - all other groups different from the first and second groups are switched to the opened state; - the device further comprises an adder adapted to calculate a pixel current (i) by subtracting the first and second currents from one another. pixels arranged in matrix, each including a current-driven type light emitting element and a transistor adapted to control a current of the current-driven type light emitting element to perform display; horizontal power supply lines (PVDDm-4 to PVDDm+11) arranged in a horizontal direction, adapted to supply a current to pixels in respective corresponding horizontal lines; and switches adapted to connect each group of the horizontal power supply lines, the each group including at least one horizontal power supply line, to one of a pixel lighting power supply line (a, PVDDa), a pixel data writing power supply line (b, PVDDa) and to an opened state (c) in a switchable manner, the pixel lighting power supply line and the pixel data writing power supply line i) being disposed outside a pixel region and ii) the pixel data writing power supply line (PVDDb) having a voltage lower than the lighting voltage on the pixel lighting power supply line (PVDDa), wherein: - a first group of said horizontal power supply lines (PVDDm+4 to PVDDm+7), to which a pixel to be measured belongs, is supplied with power from the pixel lighting power supply line so as to measure a first current (iPVDDa) of each pixel in the first group, - a second group of said horizontal power supply lines (PVDDm to PVDDm+3), to which other pixels than the pixel to be measured belong, is supplied with power from the pixel data writing power supply line so as to measure a second current (iPVDDb) in each pixel in the second group, and - all other groups different from the first and second groups are switched to the opened state; - the device further comprises an adder adapted to calculate a pixel current (i) by subtracting the first and second currents from one another. - a first group of said horizontal power supply lines (PVDDm+4 to PVDDm+7), to which a pixel to be measured belongs, is supplied with power from the pixel lighting power supply line so as to measure a first current (iPVDDa) of each pixel in the first group, - a second group of said horizontal power supply lines (PVDDm to PVDDm+3), to which other pixels than the pixel to be measured belong, is supplied with power from the pixel data writing power supply line so as to measure a second current (iPVDDb) in each pixel in the second group, and - all other groups different from the first and second groups are switched to the opened state; - the device further comprises an adder adapted to calculate a pixel current (i) by subtracting the first and second currents from one another.