Patent ID: 8040297

Claim:
An emission control driver for transmitting control signals to a gate terminal of an emission control transistor connected to a light emitting element for controlling an emission operation of a pixel, each pixel comprising a scan line controlling a gate terminal of a scanning transistor in said pixel through the use of a scan signal transmitted by said scan line in order to provide a data signal to the pixel, the emission control driver comprising: a first signal transmitting portion to selectively output a positive power supply voltage in response to a (n−1)th scan signal supplied to an (n−1)th scan line of a pixel and a nth scan signal supplied to an nth scan line of a pixel; a second signal transmitting portion to selectively output a negative power supply voltage in response to a (n+1)th scan signal supplied to an (n+1)th scan line of a pixel; and an output portion connected between the first signal transmitting portion and second signal transmitting portion to selectively output the positive power supply voltage or negative power supply voltage to the emission control transistor as an emission control signal in response to the (n−1)th scan signal, nth scan signal, and (n+1)th scan signal; wherein the first signal transmitting portion comprises: a first switching portion for switching on or off in response to the (n−1)th scan signal and nth scan signal to receive and selectively output the positive power supply voltage; and a second switching portion for switching on or off in response to the (n−1)th scan signal and nth scan signal to selectively transmit the positive power supply voltage from the first switching portion to the output portion; wherein the first switching portion comprises: a first transistor with an input terminal connected to the positive power supply voltage, an output terminal connected to the second switching portion and the output portion, and a control terminal for receiving the (n−1)th scan signal; and a second transistor connected in parallel with the first transistor with an input terminal connected to the positive power supply voltage, an output terminal connected to the second switching portion and the output portion, and a control terminal for receiving the nth scan signal; and wherein the second switching portion comprises: a third transistor with an input terminal connected to the output terminal of the first transistor, an output terminal connected to the output portion, and a control terminal for receiving the (n−1)th scan signal; and a fourth transistor connected in parallel with the third transistor with an input terminal connected to the output terminal of the first transistor, an output terminal connected to the output portion, and a control terminal for receiving the nth scan signal.