Pixel and organic light emitting display device using the same
A pixel includes: an OLED; a first transistor having a first electrode coupled to a power source and a second electrode coupled to the OLED and configured to control a magnitude of current supplied to the OLED; a third transistor having a first electrode coupled a first node and a second electrode coupled to a gate electrode of the first transistor; a capacitor coupled between the first node and a second electrode of the first transistor; a second transistor having a first electrode coupled to the first node and a second electrode coupled to a data line and configured to be turned on when the third transistor is turned off; and a fourth transistor having a first electrode coupled to a gate electrode of the first transistor and a second electrode coupled to a reference power source and configured to be turned on and off concurrently with the second transistor.
1. A pixel comprising:
an organic light emitting diode;
a first transistor having a first electrode coupled to a first power source and a second electrode coupled to the organic light emitting diode and configured to control a magnitude of a current supplied to the organic light emitting diode;
a third transistor having a first electrode coupled to a first node and a second electrode coupled to a gate electrode of the first transistor;
a storage capacitor coupled between the first node and a second electrode of the first transistor;
a second transistor having a first electrode coupled to the first node and a second electrode coupled to a data line and configured to be turned on during a first period;
a fourth transistor having a first electrode coupled to the gate electrode of the first transistor and a second electrode coupled to a reference power source and configured to be turned on and off concurrently with the second transistor; and
a fifth transistor coupled between the second electrode of the first transistor and the organic light emitting diode and configured to be turned on during the first period.
2. The pixel as claimed in claim 1 , wherein the fifth transistor is further configured to be turned off during a second period that is immediately adjacent to the first period.
3. The pixel as claimed in claim 2 , wherein the third transistor is configured to be turned on during a third period that is immediately adjacent to the second period.
4. The pixel as claimed in claim 1 , wherein the reference power source is separate from the first power source and is configured to supply a voltage substantially equal to a voltage that the first power source is configured to supply.
5. The pixel as claimed in claim 1 , wherein the reference power source is the first power source.
6. The pixel as claimed in claim 2 , wherein the first, second, third, fourth, and fifth transistors are NMOS transistors.
7. The pixel as claimed in claim 1 , wherein the third transistor is configured to be turned off during a first period.
8. An organic light emitting display device comprising:
a scan driver configured to supply a plurality of scan signals to a plurality of scan lines sequentially and to supply a plurality of light emission control signals to a plurality of light emission control lines sequentially;
a data driver configured to supply a plurality of data signals to a plurality of data lines; and
a plurality of pixels located at crossing regions of the scan lines and the data lines,
wherein each of the pixels coupled to an ith (i is a natural number) scan line of the scan lines comprises:
an organic light emitting diode;
a first transistor having a first electrode coupled to a first power source and a second electrode coupled to the organic light emitting diode and configured to control a magnitude of a current supplied to the organic light emitting diode;
a third transistor having a first electrode coupled to a first node, a second electrode coupled to a gate electrode of the first transistor, and a gate electrode coupled to an (i−1)th light emission control line of the light emission control lines;
a storage capacitor coupled between the first node and a second electrode of the first transistor;
a second transistor having a first electrode coupled to the first node, a second electrode coupled to a data line of the data lines, and a gate electrode coupled to the ith scan line;
a fourth transistor having a first electrode coupled to the gate electrode of the first transistor, a second electrode coupled to a reference power source and configured to be turned on and off concurrently with the second transistor; and
a fifth transistor having a first electrode coupled to the second electrode of the first transistor, a second electrode coupled to the organic light emitting diode, and configured to be turned on during a period in which the second transistor is turned on.
9. The organic light emitting display device as claimed in claim 8 , wherein the fifth transistor has a gate electrode coupled to an ith light emission control line of the emission control lines.
10. The organic light emitting display device as claimed in claim 9 , wherein the scan driver is configured to supply an ith light emission control signal of the light emission control signals to the ith light emission control line to partially overlap with the ith scan signal supplied to the ith scan line and to completely overlap with a scan signal of the scan signals supplied to an (i+1 )th scan line of the scan lines.
11. The organic light emitting display device as claimed in claim 9 , wherein the first, second, third, fourth, and fifth transistors are NMOS transistors.
12. The organic light emitting display device as claimed in claim 8 , wherein the reference power source is separate from the first power source and is configured to supply a voltage equal to a voltage that the power source is configured to supply.
13. The organic light emitting display device as claimed in claim 8 , wherein the reference power source is the first power source.