Emission control driver stage and display device including the same
A stage in an emission control driver of a display device includes an input unit to control a voltage of a first node and a second node in response to a first input signal supplied from a first input terminal and a second input signal supplied from a second input terminal, respectively; a first controller to control a voltage of a third node and a fourth node in response to a third input signal supplied from a third input terminal and the voltage of the second node; a second controller to control the voltage of the fourth node in response to the voltage of the first node; and an output unit to supply a voltage of a first power supply or a second power supply to an output terminal in response to the voltage of the third node or the voltage of the fourth node. The first controller includes a first transistor and a second transistor connected between the first power supply and the third node; and a third transistor connected between the first node and the third node, the first transistor being turned on in response to the voltage of the second power supply.
1. A stage in an emission control driver of a display device, the stage comprising:
an input unit connected to a first node, a second node, a first input terminal and a second input terminal to control a voltage of the first node and the second node in response to a first input signal supplied from the first input terminal and a second input signal supplied from the second input terminal, respectively;
a first controller connected to the second node, a third node, a fourth node and a third input terminal to control a voltage of the third node and the fourth node in response to a third input signal supplied from the third input terminal and the voltage of the second node;
a second controller connected to the first node and the fourth node to control the voltage of the fourth node in response to the voltage of the first node; and
an output unit connected to the third node, the fourth node, a first power supply, a second power supply, and an output terminal to supply a voltage of the first power supply or the second power supply to the output terminal in response to the voltage of the third node or the voltage of the fourth node,
wherein the first controller comprises:
a first transistor and a second transistor connected between the first power supply and the third node; and
a third transistor connected between the first node and the third node, the third transistor being turned on in response to the voltage of the second power supply.
2. The stage of claim 1 , wherein the second transistor has one electrode connected directly to the third node without passing through the third transistor.
3. The stage of claim 1 , wherein the first transistor has a gate electrode connected to the second node, and the second transistor has a gate electrode connected to the third input terminal.
4. The stage of claim 1 , wherein the first controller further comprises a first capacitor connected between the third node and the third input terminal.
5. The stage of claim 4 , wherein the voltage of the first power supply is set to a gate-off voltage, and
the voltage of the second power supply is set to a gate-on voltage.
6. The stage of claim 5 , wherein
the output unit comprises
a fourth transistor connected between the first power supply and the output terminal the fourth transistor having a gate electrode connected to the fourth node; and
a fifth transistor connected between the output terminal and the second power supply, the fifth transistor having a gate electrode connected to the third node.
7. The stage of claim 6 , wherein
the first input signal is a start pulse or an output signal of a previous stage, and
the second input signal is a first clock signal and the third input signal is a second clock signal.
8. The stage of claim 7 , wherein
the first clock signal and the second clock signal alternately have a gate-on voltage, and
the start pulse or the output signal of the previous stage is supplied to overlap with at least one gate-on voltage period of the first clock signal.
9. The stage of claim 7 , wherein
the input unit comprises
a sixth transistor connected between the first input terminal and the first node, the sixth transistor having a gate electrode connected to the second input terminal;
a seventh transistor connected between the second node and the second input terminal, the seventh transistor having a gate electrode connected to the first node; and
an eighth transistor connected between the second node and the second power supply, the eight transistor having a gate electrode connected to the second input terminal.
10. The stage of claim 9 , wherein
the first controller further comprises
a ninth transistor connected between the second node and a fifth node, the ninth transistor being turned on in response to a voltage of the second power supply;
a second capacitor connected between the fifth node and a sixth node;
a tenth transistor connected between the fourth node and the sixth node, the tenth transistor having gate electrode connected to the third input terminal; and
an eleventh transistor connected between the sixth node and the third input terminal, the eleventh transistor having a gate electrode connected to the fifth node.
11. The stage of claim 10 , wherein
the second controller comprises
a twelfth transistor connected between the first power supply and the fourth node, the twelfth transistor having a gate electrode connected to the first node or the third node; and
a third capacitor connected between the first power supply and the fourth node.
12. A display device comprising:
a plurality of pixels connected to a plurality of scan lines, a plurality of data lines, and a plurality of emission control lines;
a scan driver to supply scan signals to the scan lines;
a data driver to supply data signals to the data lines; and
an emission control driver having a plurality of stages to supply emission control signals to the emission control lines,
wherein each of the stages comprises,
an input unit connected to a first node, a second node, a first input terminal and a second input terminal to control a voltage of the first node and the second node in response to a first input signal supplied from the first input terminal and a second input signal supplied from the second input terminal, respectively;
a first controller connected to the first node, the second node, a third node, a fourth node, a third input terminal, a first power supply and a second power supply to control a voltage of the third node and the fourth node in response to a third input signal supplied from the third input terminal and the voltage of the second node, and including a first transistor and a second transistor connected between the first power supply and the third node, and a third transistor connected between the first node and the third node, the third transistor being turned on in response to the voltage of the second power supply;
a second controller connected to the first node and the fourth node to control a voltage of the fourth node in response to a voltage of the first node; and
an output unit connected to the third node, the fourth node, the first power supply, the second power supply, and an output terminal to supply a voltage of the first power supply or the second power supply to the output terminal in response to a voltage of the third node or the voltage of the fourth node.
13. The display device of claim 12 , wherein the second transistor has one electrode connected directly to the third node without passing through the third transistor.
14. The display device of claim 12 , wherein the first transistor has a gate electrode connected to the second node, and
the second transistor has a gate electrode connected to the third input terminal.
15. The display device of claim 12 , wherein
the first controller further comprises a first capacitor connected between the third input terminal and the third node.
16. The display device of claim 12 , wherein
the voltage of the first power supply is set to a gate-off voltage, and
the voltage of the second power supply is set to a gate-on voltage.
17. The display device of claim 16 , wherein
the output unit comprises
a fourth transistor connected between the first power supply and the output terminal, the fourth transistor having a gate electrode connected to the fourth node; and
a fifth transistor connected between the output terminal and the second power supply, the fifth transistor having a gate electrode connected to the third node.
18. The display device of claim 12 , wherein
the stages include a first stage to receive a start pulse through the first input terminal and the other stages to receive an output signal of a previous stage through the first input terminal.
19. The display device of claim 12 , wherein the stages include odd numbered stages to receive a first clock signal through the second input terminal and a second clock signal through the third input terminal, respectively, and
even numbered stages to receive the second clock signal through the second input terminal and the first clock signal through the third input terminal, respectively.
20. The display device of claim 19 , wherein
the first clock signal and the second clock signal alternately have a gate-on voltage.