Method and device for measuring panel current

1. A method of measuring a panel current in an active matrix organic electroluminescence display panel comprising steps of:

measuring a current flowing through a display panel when one or a plurality of pixels are caused to emit light;

measuring simultaneously a flow-in current flowing into the display panel from a side of a high voltage and a flow-out current flowing out from the display panel toward a side of a low voltage;

determining a value of a panel current using both obtained measurement results; and

performing an adding process of the measurement result of the flow-in current and the measurement result of the flow-out current, and canceling noise components in the flow-in current and the flow-out current when the value of the panel current is determined.

2. A method of measuring a panel current according to claim 1 , wherein:

the adding process of the measurement result of the flow-in current and the measurement result of the flow-out current is a weighted addition process.

3. A device which measures a panel current in an active matrix organic electroluminescence display panel, the device comprising:

a flow-in current measurement unit which measures a flow-in current flowing into a display panel from a high-voltage power supply;

a flow-out current measurement unit which measures a flow-out current flowing out from the display panel toward a low-voltage power supply; and

an adder which adds a flow-in current and a flow-out current which are simultaneously measured, and cancels noise components in the flow-in current and the flow-out current, wherein:

a panel current is measured based on a result of addition obtained by the adder.