Scan driver, method of driving the scan driver, and organic light-emitting display including the scan driver

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Quick Facts

Patent No.: US 8,704,807
App. No.: 12/986,013
Granted: Apr 22, 2014
Kind: B2

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Abstract

A scan driver includes a plurality of stages and is capable of overlapped driving of scan signals output by each of the stages. A method of driving the scan driver, and an organic light emitting display device including the scan driver, is provided.

Claims (62)

1. A scan driver comprising:

a first stage having a clock terminal electrically coupled to a first clock line and a control terminal electrically coupled to a first control line; and

a second stage having a clock terminal electrically coupled to a second clock line, and a control terminal electrically coupled to a second control line, wherein the first and second stages are configured to drive a first scan signal output from the first stage and a second scan signal output from the second stage to at least partially overlap each other,

wherein each of the first stage and the second stage comprises:

a first switching device having a control electrode electrically coupled to an input terminal, the first switching device being coupled between a first power voltage line and a first node;

a second switching device having a control electrode electrically coupled to the input terminal, the second switching device being coupled between a second power voltage line and a second node;

a third switching device having a control electrode electrically coupled to the first switching device;

a fourth switching device having a control electrode electrically coupled to the first switching device, the fourth switching device being coupled between the third switching device and the second node, wherein the third switching device is coupled between the first power voltage line and the fourth switching device;

a fifth switching device having a control electrode electrically coupled to the first control line, the fifth switching device being coupled between the second power voltage line and the first node;

a sixth switching device having a control electrode electrically coupled to the first node, the sixth switching device being coupled between the first power voltage line and a third node;

a seventh switching device having a control electrode electrically coupled to the second node, the seventh switching device being coupled between the third node and the clock terminal;

an eighth switching device having a control electrode electrically coupled to the first node, the eighth switching device being coupled between the first power voltage line and an output terminal;

a ninth switching device having a control electrode electrically coupled to the second node, the ninth switching device being coupled between the output terminal and the second power voltage line;

a first capacitor coupled between the first power voltage line and the control electrode of the sixth switching device;

a second capacitor coupled between the control electrode of the seventh switching device and the third node; and

a third capacitor coupled between the control electrode of the ninth switching device and the output terminal.

2. The scan driver of claim 1 , wherein the input terminal of the first stage is electrically coupled to an initial input line,

the output terminal of the first stage is electrically coupled to a first scan line, and

a next stage start terminal of the first stage is electrically coupled to the input terminal of the second stage.

3. The scan driver of claim 1 , wherein the input terminal of the second stage is electrically coupled to a next stage start terminal of the first stage,

the output terminal of the second stage is electrically coupled to a second scan line, and

a next stage start terminal of the second stage is electrically coupled to the input terminal of a next stage.

4. The scan driver of claim 1 , wherein the switching devices comprise PMOS transistors.

5. The scan driver of claim 1 , further comprising a tenth switching device having a control electrode electrically coupled to a reset terminal, the tenth switching device being coupled between the first node and the second power voltage line.

6. The scan driver of claim 1 , further comprising a third stage,

wherein a clock terminal of the third stage is electrically coupled to the first clock line, and

a control terminal of the third stage is electrically coupled to a third control line.

7. The scan driver of claim 1 , further comprising a third stage,

wherein a clock terminal of the third stage is electrically coupled to a third clock line, and

a control terminal of the third stage is electrically coupled to a third control line.

8. An organic light emitting display device comprising:

an organic light emitting display panel;

a scan driver configured to sequentially provide scan signals to the organic light emitting display panel via a plurality of scan lines; and

a data driver configured to provide data signals to the organic light emitting display panel via a plurality of data lines,

wherein the scan driver comprises:

a first stage having a clock terminal electrically coupled to a first clock line and a control terminal electrically coupled to a first control line; and

a second stage having a clock terminal electrically coupled to a second clock line and a control terminal electrically coupled to a second control line, wherein the first and second stages are configured to drive a first scan signal output from the first stage and a second scan signal output from the second stage to at least partially overlap each other, wherein each of the first stage and the second stage comprises: