Patent ID: 8830219

Claim:
An organic light emitting display device, comprising: a plurality of pixels at crossing regions of a plurality of scan lines and a plurality of data lines; a first control line and a second control line commonly connected with the plurality of pixels; a control line driver configured to supply a first control signal to the first control line and a second control signal to the second control line, wherein the second control signal is not concurrent with the first control signal; and a first power supply configured to supply a first power to each of the plurality of pixels, wherein a voltage level of the first power is configured to change at least once during a frame period for each of the plurality of pixels, wherein the first power supply is configured to supply the first power at a low level during a reset period of the frame period and configured to supply the first power at a high level during a compensation period and an emission period of the frame period, wherein the control line driver is configured to supply the second control signal to the second control line during the compensation period and a second period of the reset period, and is configured to supply the first control signal to the first control line during the emission period and a first period of the reset period, and wherein each of the plurality of pixels comprises: an organic light emitting diode comprising an anode electrode; a first transistor connected between the first power and the organic light emitting diode; a second transistor connected between one of the plurality of data lines and a gate electrode of the first transistor, wherein the second transistor is configured to be switched on when a scan signal is supplied to one of the plurality of scan lines; a third transistor connected between the gate electrode of the first transistor and a reference voltage, wherein the third transistor is configured to be switched on when the first control signal is supplied to the first control line; a fourth transistor that is connected between the third transistor and the reference voltage, wherein the fourth transistor is configured to be switched on when the second control signal is supplied to the second control line; a first capacitor connected between the anode electrode of the organic light emitting diode and a common node of the third transistor and the fourth transistor; and a second capacitor connected between the common node and the gate electrode of the first transistor.