Pixel, organic light emitting display and associated methods, in which a pixel transistor includes a non-volatile memory element
View Patent ↗A pixel includes an organic light emitting diode, a first transistor having a source coupled to a first power source, a control gate coupled to a first node, and a drain coupled to a second node, wherein the first transistor includes a floating gate and an insulating layer between the floating gate and the control gate, a second transistor having a source coupled to a data line, a drain coupled to the first node, and a gate coupled to a scan line, a third transistor having a source coupled to the second node, a drain coupled to the organic light emitting diode, and a gate coupled to one of a light emitting control line and the scan line, and a capacitor coupled between the first power source and the first node.
1. A pixel, comprising:
an organic light emitting diode;
a first transistor having a source coupled to a first power source, a control gate coupled to a first node, and a drain coupled to a second node, wherein the first transistor includes a floating gate and an insulating layer between the floating gate and the control gate;
a second transistor having a source coupled to a data line, a drain coupled to the first node, and a gate coupled to a scan line;
a third transistor having a source coupled to the second node, a drain coupled to the organic light emitting diode, and a gate coupled to one of a light emitting control line and the scan line; and
a capacitor coupled between the first power source and the first node.
2. The pixel as claimed in claim 1 , wherein the gate of the third transistor is coupled to the light emitting control line.
3. The pixel as claimed in claim 2 , wherein the first, second, and third transistors are PMOS transistors.
4. The pixel as claimed in claim 2 , wherein the first transistor is an NMOS transistor, and the second and third transistors are PMOS transistors.
5. The pixel as claimed in claim 1 , wherein:
the gate of the third transistor is coupled to the scan line, and
the third transistor is in an on-state when the second transistor is in an off-state.
6. The pixel as claimed in claim 5 , wherein the first and second transistors are PMOS transistors, and the third transistor is an NMOS transistor.
7. The pixel as claimed in claim 1 , the first transistor further comprises:
a non-volatile memory element.
8. The pixel as claimed in claim 7 , wherein the non-volatile memory element includes:
an insulating film on a silicon substrate;
a floating gate on the insulating film;
an oxide-nitride-oxide (ONO) layer on the floating gate;
a control gate on the ONO layer; and
a source and a drain on the silicon substrate.
9. An organic light emitting display, comprising:
a pixel unit having a plurality of pixels;
a data driver coupled to data lines of the pixel unit; and
a scan driver coupled to scan lines of the pixel unit, wherein each pixel includes:
an organic light emitting diode;
a first transistor having a source coupled to a first power source, a control gate coupled to a first node, and a drain coupled to a second node, wherein the first transistor includes a floating gate and an insulating layer between the floating gate and the control gate;
a second transistor having a source coupled to a data line, a drain coupled to the first node, and a gate coupled to a scan line;
a third transistor having a source coupled to the second node, a drain coupled to the organic light emitting diode, and a gate coupled to one of a light emitting control line and the scan line; and
a capacitor coupled between the first power source and the first node.
10. The organic light emitting display as claimed in claim 9 , wherein:
the scan driver is coupled to light emitting control lines of the pixel unit, and
the gate of the third transistor of each pixel is coupled to a light emitting control line.
11. The organic light emitting display as claimed in claim 10 , wherein the first, second, and third transistors are PMOS transistors.
12. The organic light emitting display as claimed in claim 10 , wherein the first transistor is an NMOS transistor, and the second and third transistors are PMOS transistors.
13. The organic light emitting display as claimed in claim 9 , wherein:
the gate of the third transistor of each pixel is coupled to the scan line, and
the third transistor of each pixel is in an on-state when the second transistor of the pixel is in an off-state.
14. The organic light emitting display as claimed in claim 13 , wherein the first and second transistors are PMOS transistors, and the third transistor is an NMOS transistor.
15. The organic light emitting display as claimed in claim 9 , the first transistor further comprises:
a non-volatile memory element.
16. The organic light emitting display as claimed in claim 15 , wherein the non-volatile memory element includes:
an insulating film on a silicon substrate;
a floating gate on the insulating film;
an oxide-nitride-oxide (ONO) layer on the floating gate;
a control gate on the ONO layer; and
a source and a drain on the silicon substrate.