Pixel and organic light emitting display device using the same
An organic light emitting display device includes: a scan driver for supplying partially overlapping scan signals having at least 2H width and for supplying emission control signals; a data driver; and pixels, each including: an OLED having a cathode coupled to second power; a first transistor having a first electrode coupled to first power; a second transistor between a gate electrode and a second electrode of the first transistor and turned on when the scan signal is supplied to a current scan line; a third transistor between the data line and a second node and turned on when the scan signal is supplied to a subsequent scan line; a first capacitor coupled between the first transistor gate electrode and the second node; and a fourth transistor turned on when the scan signal is supplied to a previous scan line to supply a first voltage to the first transistor gate electrode.
1. An organic light emitting display device comprising:
a scan driver for sequentially supplying scan signals having a width of at least 2H (where “H” represents a horizontal period) to scan lines and for supplying emission control signals to emission control lines arranged in parallel to the scan lines, the scan signals partially overlapping with each other;
a data driver for supplying data signals to data lines; and
pixels located at crossing regions of the scan lines and the data lines, wherein each of the pixels comprises:
an organic light emitting diode having a cathode electrode electrically coupled to a second power source;
a first transistor having a first electrode coupled to a first power source, and located between the first power source and the organic light emitting diode, the first transistor being for controlling an amount of current supplied from the first, power source to the organic light emitting diode;
a second transistor between a gate electrode and a second electrode of the first transistor and configured to be turned on in response to a corresponding one of the scan signals being supplied to a current scan line of the scan lines, the gate electrode of the first transistor being electrically coupled to a first node;
a third transistor between a corresponding one of the data lines and a second node and configured to be turned on when a corresponding one of the scan signals is supplied to a subsequent scan line of the scan lines;
a first capacitor electrically coupled between the gate electrode of the first transistor and the second node; and
a fourth transistor coupled between the gate electrode of the first transistor and the organic light emitting diode, wherein a gate electrode of the fourth transistor is configured to receive a corresponding one of the scan signals supplied to a previous scan line of the scan lines to supply a first voltage to the gate electrode of the first transistor.
2. The organic light emitting display device of claim 1 , further comprising:
a fifth transistor for supplying a second voltage to the second node when the corresponding one of the scan signals is supplied to the current scan line; and
a sixth transistor between the second electrode of the first transistor and the organic light emitting diode and configured to be turned off when a corresponding emission control signal of the emission control signals is supplied to a current emission control line of the emission control lines.
3. The organic light emitting display device of claim 2 , wherein the fifth transistor is between the second node and the first power source.
4. The organic light emitting display device of claim 2 , wherein the fifth transistor is between the second node and a reference power source for supplying the second voltage, and the second voltage is equal to or greater than a voltage of the data signals.
5. The organic light emitting display device of claim 2 , wherein the fourth transistor is between the gate electrode of the first transistor and the second power source.
6. The organic light emitting display device of claim 1 , further comprising: a second capacitor electrically coupled between the second node and the first power source.
7. The organic light emitting display device of claim 1 , further comprising: a second capacitor electrically coupled between the gate electrode of the first transistor and the first power source.
8. The organic light emitting display device of claim 1 , wherein the scan driver is configured to supply the emission control signals to the emission control lines concurrently while the scan signals are sequentially supplied to all the scan lines and does not supply the emission control signals to the emission control lines after the scan signals cease to be supplied.
9. The organic light emitting display device of claim 1 , wherein the data driver is configured to supply the data signals to the data lines every period of 1H.
10. An organic light emitting display device comprising:
a scan driver for sequentially supplying scan signals having a width of at least 2H (where “H” represents a horizontal period) to scan lines and for supplying emission control signals to emission control lines arranged in parallel to the scan lines, the scan signals partially overlapping with each other;
a data driver for supplying data signals to data lines; and
pixels located at crossing regions of the scan lines and the data lines, wherein each of the pixels comprises:
an organic light emitting diode having a cathode electrode electrically coupled to a second power source;
a first transistor having a first electrode coupled to a first power source, and located between the first power source and the organic light emitting diode, the first transistor being for controlling an amount of current supplied from the first power source to the organic light emitting diode;
a second transistor between a gate electrode and a second electrode of the first transistor and configured to be turned on when a corresponding one of the scan signals is supplied to a current scan line of the scan lines, the gate electrode of the first transistor being electrically coupled to a first node;
a third transistor between a corresponding one of the data lines and a second node and configured to be turned on when a corresponding one of the scan signals is supplied to a subsequent scan line of the scan lines;
a first capacitor electrically coupled between the gate electrode of the first transistor and the second node;
a fourth transistor configured to be turned on when a corresponding one of the scan signals is supplied to a previous scan line of the scan lines to supply a first voltage to the gate electrode of the first transistor;
a fifth transistor for supplying a second voltage to the second node when the corresponding one of the scan signals is supplied to the current scan line; and
a sixth transistor between the second electrode of the first transistor and the organic light emitting diode and configured to be turned off when a corresponding emission control signal of the emission control signals is supplied to a current emission control line of the emission control lines,
wherein the current scan line is an i-th scan line of the scan lines, the previous scan line is an i−2-th scan line of the scan lines, and the subsequent scan line is an i+3-th scan line of the scan lines, wherein i is a natural number.
11. The organic light emitting display device of claim 10 , wherein the fourth transistor is between the gate electrode of the first transistor and an initialization power source for supplying the first voltage, and the first voltage is lower than a voltage of the data signals.
12. The organic light emitting display device of claim 10 , wherein the current emission control line is an i-th emission control line of the emission control lines.
13. The organic light emitting display device of claim 10 , wherein the scan driver is configured to supply the scan signals during a period of 3H and the scan signal supplied to the i-th scan line from among the scan signals is overlapped with the scan signal supplied to an i−1-th scan line from among the scan signals during a period of 2H.
14. The organic light emitting display device of claim 13 , wherein the scan driver is configured to sequentially supply the emission control signals to the emission control lines, and the emission control signal supplied to an i-th emission control line from among the emission control signals is overlapped with the scan signals supplied to the i−2-th scan line through the i+3-th scan line.
15. A pixel comprising:
an organic light emitting diode having a cathode electrode electrically coupled to a second power source;
a first transistor having a first electrode coupled to a first power source, and configured to control an amount of current from the first power source to the organic light emitting diode;
a second transistor between a gate electrode and a second electrode of the first transistor and configured to be turned on when a scan signal is supplied to an i-th scan line, wherein the gate electrode of the first transistor is electrically coupled to a first node and i is a natural number;
a third transistor between a data line and a second node and configured to be turned on when the scan signal is supplied to an i+3-th scan line;
a first capacitor electrically coupled between the gate electrode of the first transistor and the second node;
a fourth transistor for supplying a second voltage to the second node when the scan signal is supplied to the i-th scan line; and
a fifth transistor configured to be turned on when the scan signal is supplied to an i−2-th scan line to supply a first voltage to the gate electrode of the first transistor.
16. The pixel of claim 15 , further comprising:
a second capacitor electrically coupled between the second node and the first power source.
17. The pixel of claim 15 , further comprising:
a second capacitor electrically coupled between the gate electrode of the first transistor and the first power source.
18. The pixel of claim 15 , further comprising:
a sixth transistor between the second electrode of the first transistor and the organic light emitting diode and configured to be turned off when an emission control signal is supplied to an i-th emission control line.
19. The pixel of claim 15 , wherein the fourth transistor is between the second node and the first power source.
20. The pixel of claim 15 , wherein the fourth transistor is between the second node and a reference power source for supplying the second voltage, and the second voltage is equal to or greater than a voltage of a data signal supplied to the data line.
21. The pixel of claim 15 , wherein the fifth transistor is electrically coupled to the gate electrode of the first transistor and an anode electrode of the organic light emitting diode.
22. The pixel of claim 15 , wherein the fifth transistor is between the gate electrode of the first transistor and the second power source.
23. The pixel of claim 15 , wherein the fifth transistor is between the gate electrode of the first transistor and an initialization power source for supplying the first voltage, and the first voltage is lower than a voltage of a data signal supplied to the data line.
24. The pixel of claim 15 , wherein a turn-on period of the first transistor is partially overlapped with a turn-on period of the second transistor.