Emission control driver and organic light emitting display device having the same and a logical or circuit for an emission control driver for outputting an emission control signal

An emission control driver, comprising:

• a first flip-flop which receives a start pulse and generates a first output signal and a first inverted output signal in synchronization with a clock signal and an inverted clock signal;
• a second flip-flop which receives the first output signal and the first inverted output signal of the first flip-flop and generates a second output signal and a second inverted output signal in synchronization with the clock signal and the inverted clock signal;
• and
• a plurality of logic gates, each logic gate receives the first output signal and the first inverted output signal of the first flip-flop and the second output signal and the second inverted output signal of the second flip-flop, controls an active load using the received signals, and generates an emission control signal through a logical OR operation on the output signals and inverted output signals of the first and second flip-flops.

A logical OR circuit for an emission control driver for outputting an emission control signal, comprising:

• an input portion connected to a first power supply voltage and which turns on/off according to the levels of a first input signal and a second input signal;
• a first active load comprising a first transistor connected between the input portion and a second power supply voltage and selectively diode-connected according to the level of one of a first inverted input signal and a second inverted input signal;
• an output transistor connected between the first power supply voltage and an emission control line and which turns on/off according to the level of an output signal of one of the input portion and the first active load;
• and
• a second active load comprising a second transistor connected between the second power supply voltage and the emission control line and selectively diode-connected according to the levels of the first and second input signals.