Patent ID: 7646366

Claim:
A driving circuit of an organic light emitting display, comprising: a first PMOS transistor connected to a first node, the first PMOS transistor being turned on in response to a first driving signal to transfer a data signal; an OLED of which an amount of light emission is controlled by a control current; a second PMOS transistor connected to a second node, a line of power supply voltage and the OLED to supply the control current to the OLED; a first capacitor connected between the first and second nodes; a third PMOS transistor connected to the second node and the line of power supply voltage, the third PMOS transistor being turned on in response to a second driving signal to initialize the second node as a power supply voltage; and a second capacitor connected to the first node and the line of power supply voltage, wherein a power supply voltage included in the control current is compensated with the power supply voltage stored in the second node so that the control current is dependent on the data signal and a threshold voltage of the second PMOS transistor regardless of the power supply voltage, wherein the second and third PMOS transistors and the second capacitor is commonly connected to the line of power supply voltage, and wherein the data signal includes an initialization voltage and an effective data voltage to sequentially be supplied to the first node while the first PMOS transistor is turned on.