A pixel circuit for an organic light emitting device, comprising: a first transistor (T 32) for delivering a voltage level of a data signal applied to its source in response to a current scan signal applied to its gate; a second transistor (T 31) for generating a driving current depending on the voltage level of data signal delivered to its source through the first transistor; a third transistor (T 33) for connecting the second transistor in the form of a diode in response to the current scan signal applied to the gate of the third transistor (T 33); an electroluminescent element (EL 31) for emitting light corresponding to the driving current generated through the second transistor (T 31); a driving current providing transistor ( T 36) for providing the driving current for the electroluminescent element (EL 31) from the drain of the second transistor (T 31) in response to a current light-emitting signal applied to the gate of the driving current providing transistor ( T 36); and a capacitor (C 31) for storing the voltage level of the data signal delivered to the source of the second transistor (T 31), and an initialization transistor ( T 34) for initializing the voltage level stored in the capacitor (C 31) in response to a previous scan signal, wherein the initialization transistor (T 34) is a PMOS transistor, wherein the initialization transistor (T 34) includes a gate to which the previous scan line signal is applied, a source coupled to a gate of the second transistor (T 31) and a first terminal of the capacitor (C 31), and a drain coupled to an initialization voltage supply, characterized in that the pixel circuit further comprises a transistor (T 35) providing a power supply voltage to the second transistor (T 31) in response to a current light emitting signal of the power supply providing transistor and in that the drain of the first transistor is connected to the source of the second transistor. a first transistor (T 32) for delivering a voltage level of a data signal applied to its source in response to a current scan signal applied to its gate; a second transistor (T 31) for generating a driving current depending on the voltage level of data signal delivered to its source through the first transistor; a third transistor (T 33) for connecting the second transistor in the form of a diode in response to the current scan signal applied to the gate of the third transistor (T 33); an electroluminescent element (EL 31) for emitting light corresponding to the driving current generated through the second transistor (T 31); a driving current providing transistor ( T 36) for providing the driving current for the electroluminescent element (EL 31) from the drain of the second transistor (T 31) in response to a current light-emitting signal applied to the gate of the driving current providing transistor ( T 36); and a capacitor (C 31) for storing the voltage level of the data signal delivered to the source of the second transistor (T 31), and an initialization transistor ( T 34) for initializing the voltage level stored in the capacitor (C 31) in response to a previous scan signal, wherein the initialization transistor (T 34) is a PMOS transistor, wherein the initialization transistor (T 34) includes a gate to which the previous scan line signal is applied, a source coupled to a gate of the second transistor (T 31) and a first terminal of the capacitor (C 31), and a drain coupled to an initialization voltage supply, characterized in that the pixel circuit further comprises a transistor (T 35) providing a power supply voltage to the second transistor (T 31) in response to a current light emitting signal of the power supply providing transistor and in that the drain of the first transistor is connected to the source of the second transistor.