Picture element structure of current programming method type active matrix organic emitting diode display and driving method of data line

A picture element structure in a current programming type of active matrix organic light emitting diode (OLED) having at least one scan line, at least one data line and a power supply source, comprising:

• a capacitor connected to the power supply source, for storing electric charges supplied to said data line;
• a first switching element having a P-type thin film transistor, of which gate is connected to the scan line and source/drain current path is connected to the data line;
• a second switching element having a P-type thin film transistor, of which gate is connected to the scan line and source/drain current path is formed between said capacitor and said first switching element;
• a third driving element having a P-type thin film transistor, of which gate is connected to the capacitor and source/drain current path is formed in said power supply source;
• a driving element having a P-type thin film transistor, of which gate is connected to the gate of the third driving element and source/drain current path is connected in said a third driving element;
• and
• an organic light emitting diode (OLED) for emitting light by a current flowing through said driving element.