Aging circuit for organic electro luminescence device and driving method thereof
View Patent ↗An aging circuit for an organic electro luminescence device includes a plurality of pixels arranged in a matrix at intersection areas of row lines and column lines and an aging circuit having at least one aging AC voltage source to apply a specific aging AC voltage pulse to the pixels.
1. An aging circuit for an organic electro luminescence device, comprising:
a plurality of pixels arranged in a matrix at intersection areas of row lines and column lines;
an organic electro luminescence cell formed at a pixel area between the column lines and the row lines;
a first switch device formed at the intersection area of the column line and the row line for acting as a switch;
a second switch device formed between a cell drive voltage source and the electro luminescence cell for driving the electro luminescence cell;
a capacitor connected between the first switch device and the second switch device, wherein a cathode terminal of the electro luminescence cell is connected to a cell support voltage source of a positive voltage; and
an aging circuit having at least one aging AC voltage source for applying a specific aging AC voltage pulse to the pixels.
2. The aging circuit according to claim 1 , further comprising:
first and second aging AC voltage sources that are switched between 0V and a specific negative voltage, the specific negative voltage is different for each aging AC voltage source;
a first aging switch device connected between the first aging AC voltage source and a gate terminal of the first switch device;
a second aging switch device connected between the second aging AC voltage source and a source terminal of the first switch device; and
a third aging AC voltage source for turning on the first and second aging switch devices.
3. The aging circuit according to claim 2 , wherein a supply voltage difference between the cell drive voltage source and the cell support voltage source is −15V.
4. The aging circuit according to claim 3 , wherein a supply voltage of the cell drive voltage source is −5V, and a supply voltage of the cell support voltage source is +10V.
5. The aging circuit according to claim 4 , wherein the first to third aging AC voltage sources are applied with an AC voltage pulse, and there is a relationship of the cell drive voltage source>the second aging AC voltage source>the first aging AC voltage source>the third aging AC voltage source with respect to the supply voltage.
6. The aging circuit according to claim 5 , wherein a supply voltage of the second aging AC voltage source is −10 V, a supply voltage of the first aging AC voltage source is −15V and a supply voltage of the third aging AC voltage source is −20V.
7. An aging circuit for an organic electro luminescence device, comprising:
an organic electro luminescence cell formed at a pixel area between the column lines and the row lines;
a first switch device formed between a cell drive voltage source and the electro luminescence cell for driving the electro luminescence cell;
a second switch device connected to the cell drive voltage source to form a current mirror with the first switch device;
a third switch device connected to the second switch device, the column line and the row line for responding to a signal in the row line;
a fourth switch device connected between the third switch device and gate terminals of the first and second switch devices;
a capacitor connected between the cell drive voltage source and the gate terminals of the first and second switch devices, wherein a cathode terminal of the electro luminescence cell is connected to a cell support voltage source of a positive voltage; and
an aging circuit having at least one aging AC voltage source for applying a specific aging AC voltage pulse to the pixels.
8. The aging circuit according to claim 7 , further comprising:
first and second aging AC voltage source that are switched between 0V and a specific negative voltage, the specific negative voltage is different for each aging AC voltage source;
a first aging switch device connected between the first aging AC voltage source and a gate terminal of the third switch device;
a second aging switch device connected between the first aging AC voltage source and a gate terminal of the fourth switch device;
a third aging switch device connected between the second aging AC voltage source and a source terminal of the third switch device; and
a third aging AC voltage source for turning on the first to third aging switch devices.
9. The aging circuit according to claim 8 , wherein a supply voltage difference between the cell drive voltage source and the cell support voltage source is −15V.
10. The aging circuit according to claim 9 , wherein a supply voltage of the cell drive voltage source is −5V, and a supply voltage of the cell support voltage source is −10V.
11. The aging circuit according to claim 10 , wherein the first to third aging AC voltage source are applied in an AC voltage pulse, and there is a relationship of the cell drive voltage source>the second aging AC voltage source>the first aging AC voltage source>the third aging AC voltage source with respect to the supply voltage.
12. The aging circuit according to claim 11 , wherein a supply voltage of the second aging AC voltage source is −10, a supply voltage of the first aging AC voltage source is −15V and a supply voltage of the third aging AC voltage source is −20V.
13. A driving method of an aging circuit for an organic electro luminescence device, wherein the aging circuit applies a specific aging voltage to pixels of the organic electro luminescence device, comprising:
applying a plurality of aging AC voltages to the pixels, the aging AC voltage is applied in an AC voltage pulse; and
causing an electro luminescence cell within the pixel to emit light by the aging AC voltage in accordance with a current corresponding to a current path formed, wherein the electro luminescence cell emits light in accordance with a voltage difference between a cell support voltage source and a cell drive voltage source corresponding to the current path.
14. The driving method according to claim 13 , wherein the cell drive voltage source applies a negative voltage and a supply voltage difference between the cell drive voltage source and the cell support voltage source is −15V.
15. The driving method according to claim 13 , wherein the aging AC voltage sources apply a voltage lower than the cell drive voltage source applies.
16. An aging circuit for organic electro luminescence device having an organic electro luminescence cell formed at a pixel area between the column lines and the row lines, the aging circuit comprising;
at least one aging AC voltage source for applying a specific aging AC voltage pulse to the pixels;
a second aging AC voltage sources that are switched between 0V and a specific negative voltage, the specific negative voltage is different for each aging AC voltage source; and
a third aging AC voltage source for turning on the first and second aging switch devices.