Organic light emitting display
View Patent ↗An organic light emitting display that can minimize degradation of a drive transistor comprising a first switching element whose control electrode is electrically coupled to a scan line, being electrically coupled between a data line and a first voltage line for transmitting a data signal; a drive transistor whose control electrode is electrically coupled to the first switching element, being electrically coupled between the first and second voltage lines; an organic light emitting diode electrically coupled to the drive transistor, displaying an image by a current supplied through the drive transistor; a first capacitive element electrically coupled between the control electrode of the drive transistor and the first switching element; a second capacitive element electrically coupled between the first capacitive element and the second voltage line; a second switching element electrically coupled between the first voltage line and the control electrode of the drive transistor; a third switching element electrically coupled between the first switching element and the drive transistor; a fourth switching element electrically coupled between the control electrode of the drive transistor and the second voltage line; and a fifth switching element electrically coupled between the drive transistor and the second voltage line.
1. An organic light emitting display, comprising:
a first switching element having a control electrode is electrically coupled to a scan line, being electrically coupled between a data line and a first voltage line for transmitting a data signal;
a drive transistor having a control electrode is electrically coupled to the first switching element, being electrically coupled between the first voltage line and a second voltage line;
an organic light emitting diode electrically coupled to the drive transistor, displaying an image by a current supplied through the drive transistor;
a first capacitive element electrically coupled between the control electrode of the drive transistor and the first switching element;
a second capacitive element electrically coupled between the first capacitive element and the second voltage line;
a second switching element electrically coupled between the first voltage line and the control electrode of the drive transistor;
a third switching element electrically coupled between the first switching element and the drive transistor;
a fourth switching element electrically coupled between the control electrode of the drive transistor and the second voltage line;
a fifth switching element electrically coupled between the drive transistor and the second voltage line; and
wherein a first electrode of the first switching element is electrically coupled to the data line, and a second electrode of the first switching element is electrically coupled between a first electrode of the third switching element and a second electrode of the first capacitive element and a first electrode of the second capacitive element.
2. The organic light emitting display of claim 1 , wherein a control electrode of the second switching element is electrically coupled to a previous scan line, and a first electrode of the second switching element is electrically coupled between a first electrode of the fourth switching element and a first electrode of the first capacitive element and the control electrode of the drive transistor, and a second electrode of the second switching element is electrically coupled between the first voltage line and the first electrode of the drive transistor.
3. The organic light emitting display of claim 1 , wherein a control electrode of the third switching element is electrically coupled to a threshold voltage compensation line, and a first electrode of the third switching element is electrically coupled between a second electrode of the first switching element and the second electrode of the first capacitive element and the first electrode of the second capacitive element, and a second electrode of the third switching element is electrically coupled between the drive transistor and the fifth switching element.
4. The organic light emitting display of claim 1 , wherein a control electrode of the fourth switching element is electrically coupled to a negative annealing line, and a first electrode of the fourth switching element is electrically coupled between the control electrode of the drive transistor and the first electrode of the second switching element and the first electrode of the first capacitive element, and a second electrode of the fourth switching element is electrically coupled to the second voltage line.
5. The organic light emitting display of claim 1 , wherein a control electrode of the fifth switching element is electrically coupled to an emission control line, and a first electrode of the fifth switching element is electrically coupled between the second electrode of the drive transistor and the second electrode of the third switching element, and a second electrode of the fifth switching element is electrically coupled to the second voltage line.
6. The organic light emitting display of claim 1 , wherein an anode of the organic light emitting diode is electrically coupled to the fifth switching element, a cathode of the organic light emitting diode is electrically coupled to the second voltage.
7. The organic light emitting display of claim 1 , wherein an anode of the organic light emitting diode is electrically coupled to the first voltage line, a cathode of the organic light emitting diode is electrically coupled between the first electrode of the drive transistor and the second electrode of the second switching element.
8. The organic light emitting display of claim 1 , wherein a first electrode of the first capacitive element is electrically coupled between the first electrode of the second switching element and the control electrode of the drive transistor and the first electrode of the fourth switching element, and a second electrode of the first capacitive element is electrically coupled between the second electrode of the first switching element and the first electrode of the third switching element and the first electrode of the second capacitive element.
9. The organic light emitting display of claim 1 , wherein a first electrode of the second capacitive element is electrically coupled between the second electrode of the first capacitive element and the second electrode of the first switching element and the first electrode of the third switching element, and a second electrode of the second capacitive element is electrically coupled between the second electrode of the fourth switching element and the second voltage line.
10. The organic light emitting display of claim 1 , wherein the first, second, third, fourth and fifth switching elements and the drive transistor are an N type channel transistor.
11. The organic light emitting display of claim 1 , wherein when the second and fifth switching elements are turned off and the first, third and fourth switching elements are turned on during an image display period of one frame, a data signal is applied to the second electrode of the drive transistor, and the second voltage is applied to the control electrode of the drive transistor.
12. An organic light emitting display, comprising:
a first switching element having a control electrode is electrically coupled to a scan line, being electrically coupled between a data line and a first voltage line for transmitting a data signal;
a drive transistor having a control electrode is electrically coupled to the first switching element, being electrically coupled between the first voltage line and a second voltage line;
an organic light emitting diode electrically coupled to the drive transistor, displaying an image by a current supplied through the drive transistor;
a first capacitive element electrically coupled between the control electrode of the drive transistor and the first switching element;
a second capacitive element electrically coupled between the first capacitive element and the first voltage line;
a second switching element electrically coupled between the second voltage line and the control electrode of the drive transistor;
a third switching element electrically coupled between the first switching element and the drive transistor;
a fourth switching element electrically coupled between the control electrode of the drive transistor and the first voltage line;
a fifth switching element electrically coupled between the drive transistor and the first voltage line; and
wherein a first electrode of the first switching element is electrically coupled to the data line, and a second electrode of the first switching element is electrically coupled between a first electrode of the third switching element and a first electrode of the first capacitive element and a second electrode of the second capacitive element.
13. The organic light emitting display of claim 12 , wherein a control electrode of the second switching element is electrically coupled to a previous scan line, and a first electrode of the second switching element is electrically coupled between a second electrode of the fourth switching element and a second electrode of the first capacitive element and the control electrode of the drive transistor, and a second electrode of the second switching element is electrically coupled between the second voltage line and the second electrode of the drive transistor.
14. The organic light emitting display of claim 12 , wherein a control electrode of the third switching element is electrically coupled to a threshold voltage compensation line, and a first electrode of the third switching element is electrically coupled between a second electrode of the first switching element and the first electrode of the first capacitive element and the second electrode of the second capacitive element, and a second electrode of the third switching element is electrically coupled between the drive transistor and the fifth switching element.
15. The organic light emitting display of claim 12 , wherein a control electrode of the fourth switching element is electrically coupled to a negative annealing line, and a first electrode of the fourth switching element is electrically coupled to the first voltage line, and a second electrode of the fourth switching element is electrically coupled between the control electrode of the drive transistor and the first electrode of the second switching element and the second electrode of the first capacitive element.
16. The organic light emitting display of claim 12 , wherein a control electrode of the fifth switching element is electrically coupled to an emission control line, and a first electrode of the fifth switching element is electrically coupled to the first voltage line, and a second electrode of the fifth switching element is electrically coupled between the first electrode of the drive transistor and the second electrode of the third switching element.
17. The organic light emitting display of claim 12 , wherein an anode of the organic light emitting diode is electrically coupled between the second electrode of the drive transistor and the second electrode of the second switching element, and a cathode of the organic light emitting diode is electrically coupled to the second voltage.
18. The organic light emitting display of claim 12 , wherein an anode of the organic light emitting diode is electrically coupled to the first voltage line, a cathode of the organic light emitting diode is electrically coupled to the first electrode of the fifth switching element.
19. The organic light emitting display of claim 12 , wherein a first electrode of the first capacitive element is electrically coupled between the second electrode of the first switching element and the first electrode of the third switching element and the second electrode of the second capacitive element, and a second electrode of the first capacitive element is electrically coupled between the first electrode of the second switching element and the control electrode of the drive transistor and the second electrode of the fourth switching element.
20. The organic light emitting display of claim 12 , wherein a first electrode of the second capacitive element is electrically coupled between the first electrode of the fourth switching element and the first voltage line, and a second electrode of the second capacitive element is electrically coupled between the first electrode of the first capacitive element and the second electrode of the first switching element and the first electrode of the third switching element.
21. The organic light emitting display of claim 12 , wherein the first, second, third, fourth and fifth switching elements and the drive transistor are a P type channel transistor.
22. The organic light emitting display of claim 12 , wherein when the second and fifth switching elements are turned off and the first, third and fourth switching elements are turned on during an image display period of one frame, a data signal is applied to the first electrode of the drive transistor, and the first voltage is applied to the control electrode of the drive transistor.