Patent ID: 7760164

Claim:
An organic light emitting diode display device comprising: a first transistor having a first electrode coupled to a first voltage source; a first capacitor coupled between a control electrode of the first transistor and the first voltage source; a second transistor coupled between the control electrode of the first transistor and a second voltage source, and being adapted to turn on in response to an on voltage of a first control signal; a third transistor having a first electrode coupled to the first voltage source and a second electrode coupled to the control electrode of the first transistor; a fourth transistor having a first electrode coupled to a data line for transmitting a data voltage, and being adapted to transmit the data voltage in response to an on voltage of a second control signal; a second capacitor for storing the data voltage from the fourth transistor, and for determining a voltage between the first electrode of the first transistor and the control electrode of the first transistor; a threshold voltage compensator for compensating a threshold voltage of the third transistor together with the second capacitor; an organic light emitting diode; a fifth transistor for transmitting a current of a second electrode of the first transistor to the organic light emitting diode in response to an on voltage of a third control signal; and a photoelectric transformation element for transmitting a current corresponding to a light emitted by the organic light emitting diode to the second capacitor, wherein a first electrode of the second capacitor is coupled to the first voltage source, and the threshold voltage compensator comprises: a sixth transistor for electrically coupling a control electrode of the third transistor to a second electrode of the third transistor in response to an on voltage of a fourth control signal; a third capacitor having a first electrode coupled to the control electrode of the third transistor and a second electrode coupled to a second electrode of the second capacitor; and a seventh transistor coupling the first electrode of the third capacitor to the first voltage source in response to the on voltage of the fourth control signal.