Patent ID: 8022920

Claim:
An organic light emitting display comprising: a first shift register electrically coupled with an initial clock line, an initial negative clock line and an initial drive line; a second shift register electrically coupled with the initial negative clock line, the initial clock line and a first light emitting control line which is an output line of the first shift register; a first NAND gate electrically coupled with the initial drive line, the first light emitting control line, and a first clock line; a second NAND gate electrically coupled with the first light emitting control line, a second light emitting control line which is an output line of the second shift register, and a second clock line; a first pixel part electrically coupled with a first scan line which is an output line of the first NAND gate; a second pixel part electrically coupled with a second scan line which is an output line of the second NAND gate; a third pixel part electrically coupled with the first scan line; and a fourth pixel part electrically coupled with the second scan line, wherein the first NAND gate is electrically coupled with the initial drive line, the first light emitting control line, and the first clock line, and outputs a first scan signal to the first scan line using an initial drive signal, a first light emitting control signal, and a first clock signal, and wherein the second NAND gate is electrically coupled with the first light emitting control line, the second light emitting control line, and the second clock line, and outputs a second scan signal to the second scan line using the first light emitting control signal, a second light emitting control signal, and a second clock signal.