Active matrix organic electroluminescence display device and method of fabricating the same

• US 20030122497A1
• Filed: 12/26/2002
• Published: 07/03/2003
• Est. Priority Date: 12/29/2001
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Ahn, Tae-Joon, Ko, Doo-Hyun
• Granted Patent: US 6,674,245 B2
• Time in Patent Office: Days
• US Class Current: 315/169.3
• CPC Class Codes: G09G 2300/0439 Pixel structures
• CPC Class Codes: G09G 2300/0809 Several active elements per pixel in active matrix panels
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3241 the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
• CPC Class Codes: H01L 27/1255 integrated with passive devices, e.g. auxiliary capacitors
• CPC Class Codes: H10K 59/1216 the pixel elements being capacitors
• CPC Class Codes: H10K 59/1315 comprising structures specially adapted for lowering the resistance

Abstract

An active matrix organic electroluminescence display device and a method of fabricating the same are disclosed in the present invention. The device includes gate and data lines defining a pixel region on a substrate, a switching thin film transistor connected to the gate and data lines, a driving thin film transistor connected to the switching thin film transistor, a power line connected to the driving thin film transistor, a transparent first capacitor electrode connected to and overlapping the power line, a second capacitor electrode connected to the driving thin film transistor, and a pixel electrode formed at the pixel region and connected to the driving thin film transistor.

Claims

1. An active matrix organic electroluminescence display device, comprising:

gate and data lines defining a pixel region on a substrate;

a switching thin film transistor connected to the gate and data lines;

a driving thin film transistor connected to the switching thin film transistor;

a power line connected to the driving thin film transistor;

a transparent first capacitor electrode connected to and overlapping the power line;

a second capacitor electrode connected to the driving thin film transistor; and

a pixel electrode formed at the pixel region and connected to the driving thin film transistor.

2. The device according to claim 1, wherein the power line is formed of the same material as the first capacitor electrode.

3. The device according to claim 1, wherein the first capacitor electrode is formed of one of indium tin oxide (ITO) and indium zinc oxide (IZO).

4. The device according to claim 1, further comprising contact holes at the overlapped portion of the power line and the first capacitor electrode.

5. The device according to claim 4, wherein the power line is formed of an opaque metal material, and the first capacitor electrode is formed of one of indium tin oxide (ITO) and indium zinc oxide (IZO).

6. The device according to claim 1, wherein the second capacitor electrode is formed of doped polycrystalline silicon.

7. An active matrix organic electroluminescence display device, comprising:

gate and data lines defining a pixel region on a substrate;

a switching thin film transistor connected to the gate and data lines;

a driving thin film transistor connected to the switching thin film transistor;

a power line connected to the driving thin film transistor and having first, second, and third portions, the first and second portions being parallel to the data line, the third portion connecting the first and second portions, the first portion being connected to the second portion of the power line of an adjacent pixel region;

a first capacitor electrode connected to the driving thin film transistor and overlapping the first portion of the power line; and

a pixel electrode formed at the pixel region and connected to the driving thin film transistor.

8. The device according to claim 7, wherein the second and third portions of the power line overlap edge portions of the pixel electrode.

9. The device according to claim 8, wherein the power line is formed of a transparent conductive material.

10. The device according to claim 9, wherein the power line is formed of one of indium tin oxide (ITO) and indium zinc oxide (IZO).

11. The device according to claim 7, further comprising a second capacitor electrode extended from the first portion of the power line to the pixel region, and a third capacitor electrode extended from the first capacitor electrode and overlapping the second capacitor electrode.

12. The device according to claim 11, wherein the second capacitor electrode is formed of one of indium tin oxide (ITO) and indium zinc oxide (IZO), and the third capacitor electrode is formed of doped polycrystalline silicon.

13. The device according to claim 7, wherein the first capacitor electrode is formed of doped polycrystalline silicon.

14. An active matrix organic electroluminescence display device, comprising:

gate and data lines defining a pixel region on a substrate;

a first switching thin film transistor connected to the gate and data lines;

a first driving thin film transistor connected to the first switching thin film transistor;

a second switching thin film transistor connected to the first switching thin film transistor;

a second driving thin film transistor connected to the second switching thin film transistor and the first driving thin film transistor;

a power line connected to the first driving thin film transistor;

a first capacitor electrode formed of a transparent conductive material on the pixel region and connected to the power line;

a second capacitor electrode connected to the first driving thin film transistor and overlapping the first capacitor electrode; and

a pixel electrode formed at the pixel region and connected to the first driving thin film transistor.

15. The device according to claim 14, wherein the power line is formed of the same material as the first capacitor electrode.

16. The device according to claim 15, wherein the first capacitor electrode is formed of one of indium tin oxide (ITO) and indium zinc oxide (IZO).

17. The device according to claim 14, wherein the power line and the first capacitor electrode overlap each other, and the overlapped portion has contact holes.

18. The device according to claim 17, wherein the power line is formed of an opaque metal material, and the first capacitor electrode is formed of one of indium tin oxide (ITO) and indium zinc oxide (IZO).

19. The device according to claim 14, wherein the second capacitor electrode is formed of doped polycrystalline silicon.

20. An active matrix organic electroluminescence display device, comprising:

gate and data lines defining a pixel region on a substrate;

a first switching thin film transistor connected to the gate and data lines;

a first driving thin film transistor connected to the first switching thin film transistor;

a second switching thin film transistor connected to the first switching thin film transistor;

a second driving thin film transistor connected to the second switching thin film transistor and the first driving thin film transistor;

a power line connected to the first driving thin film transistor and having first, second, and third portions, the first and second portions being parallel to the data line, the third portion connecting the first and second portions, the first portion being connected to the second portion of the power line of an adjacent pixel region;

a first capacitor electrode connected to the first driving thin film transistor and overlapping the first portion of the power line; and

a pixel electrode formed in the pixel region and connected to the first driving thin film transistor.

21. The device according to claim 20, wherein the second and third portions of the power line overlap edge portions of the pixel electrode.

22. The device according to claim 21, wherein the power line is formed of a transparent conductive material.

23. The device according to claim 22, wherein the power line is formed of one of indium tin oxide (ITO) and indium zinc oxide (IZO).

24. The device according to claim 20, further comprising a second capacitor electrode extended from the first portion of the power line to the pixel region, and a third capacitor electrode extended from the first capacitor electrode and overlapping the second capacitor electrode.

25. The device according to claim 24, wherein the second capacitor electrode is formed of one of indium tin oxide (ITO) and indium zinc oxide (IZO), and the third capacitor electrode is formed of doped polycrystalline silicon.

26. The device according to claim 20, wherein the first capacitor electrode is formed of doped polycrystalline silicon.

27. The method of forming an active matrix organic electroluminescence display device, comprising:

forming gate and data lines defining a pixel region on a substrate;

forming a switching thin film transistor connected to the gate and data lines;

forming a driving thin film transistor connected to the switching thin film transistor;

forming a power line connected to the driving thin film transistor;

forming a transparent first capacitor electrode connected to and overlapping the power line;

forming a second capacitor electrode connected to the driving thin film transistor; and

forming a pixel electrode formed at the pixel region and connected to the driving thin film transistor.

28. A method of forming an active matrix organic electroluminescence display device, comprising:

forming gate and data lines defining a pixel region on a substrate;

forming a switching thin film transistor connected to the gate and data lines;

forming a driving thin film transistor connected to the switching thin film transistor;

forming a power line connected to the driving thin film transistor and having first, second, and third portions, the first and second portions being parallel to the data line, the third portion connecting the first and second portions, the first portion being connected to the second portion of the power line of an adjacent pixel region;

forming a first capacitor electrode connected to the driving thin film transistor and overlapping the first portion of the power line; and

forming a pixel electrode formed at the pixel region and connected to the driving thin film transistor.

29. A method of forming an active matrix organic electroluminescence display device, comprising:

forming gate and data lines defining a pixel region on a substrate;

forming a first switching thin film transistor connected to the gate and data lines;

forming a first driving thin film transistor connected to the first switching thin film transistor;

forming a second switching thin film transistor connected to the first switching thin film transistor;

forming a second driving thin film transistor connected to the second switching thin film transistor and the first driving thin film transistor;

forming a power line connected to the first driving thin film transistor;

forming a first capacitor electrode formed of a transparent conductive material on the pixel region and connected to the power line;

forming a second capacitor electrode connected to the first driving thin film transistor and overlapping the first capacitor electrode; and

forming a pixel electrode formed at the pixel region and connected to the first driving thin film transistor.

30. A method of forming an active matrix organic electroluminescence display device, comprising:

forming gate and data lines defining a pixel region on a substrate;

forming a first switching thin film transistor connected to the gate and data lines;

forming a first driving thin film transistor connected to the first switching thin film transistor;

forming a second switching thin film transistor connected to the first switching thin film transistor;

forming a second driving thin film transistor connected to the second switching thin film transistor and the first driving thin film transistor;

forming a power line connected to the first driving thin film transistor and having first, second, and third portions, the first and second portions being parallel to the data line, the third portion connecting the first and second portions, the first portion being connected to the second portion of the power line of an adjacent pixel region;

forming a first capacitor electrode connected to the first driving thin film transistor and overlapping the first portion of the power line; and

forming a pixel electrode formed in the pixel region and connected to the first driving thin film transistor.