ORGANIC LIGHT EMITTING DEVICE AND METHOD FOR MANUFACTURING THE SAME

• US 20080157081A1
• Filed: 08/27/2007
• Published: 07/03/2008
• Est. Priority Date: 12/28/2006
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: HUH, Jong-Moo
• Application Number:
  US11/845,202
• Publication Number:
  US 20080157081A1
• Time in Patent Office: Days
• US Class Current: 257/59
• CPC Class Codes: H01L 27/1214 comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs

Abstract

An organic light emitting device includes a substrate, first and second signal lines formed on the substrate, a switching thin film transistor (“TFT”) connected to the first and second signal lines and including a first semiconductor, a driving TFT including a second semiconductor, an etch stopper formed on the second semiconductor, driving input and driving output electrodes overlapping the etch stopper and the second semiconductor and opposite to each other with respect to the etch stopper, and a driving control electrode connected to the switching TFT and overlapping the second semiconductor, a first electrode connected to the driving output electrode, a second electrode opposite to the first electrode, and an organic light emitting member, wherein at least one of the etch stopper, the driving input electrode, and the driving output electrode is symmetrical with respect to one straight line.

Claims

1. An organic light emitting device comprising:

a substrate;

first and second signal lines formed on the substrate;

a switching thin film transistor connected to the first and second signal lines and including a first semiconductor;

a driving thin film transistor including a second semiconductor, an etch stopper formed on the second semiconductor, driving input and driving output electrodes overlapping the etch stopper and the second semiconductor and opposite to each other with respect to the etch stopper, and a driving control electrode connected to the switching thin film transistor and overlapping the second semiconductor;

a first electrode connected to the driving output electrode;

a second electrode opposite to the first electrode; and

an organic light emitting member,

wherein at least one of the etch stopper, the driving input electrode, and the driving output electrode is symmetrical with respect to one straight line.

2. The organic light emitting device of claim 1, wherein the second semiconductor has a first portion and a second portion separated from the first portion.

3. The organic light emitting device of claim 2, wherein the etch stopper includes a running oval shape, and wherein the driving input electrode overlaps an inner portion of the etch stopper and the driving output electrode overlaps an outer portion of the etch stopper.

4. The organic light emitting device of claim 3, wherein the driving output electrode includes first and second portions disposed on opposing sides of the etch stopper, and a third portion connecting the first and second portions of the etch stopper to each other.

5. The organic light emitting device of claim 1, further comprising a third signal line connected to the driving input electrode of the driving thin film transistor.

6. The organic light emitting device of claim 5, wherein the etch stopper, the driving input electrode, and the driving output electrode are symmetrical with respect to the third signal line.

7. The organic light emitting device of claim 6, wherein the driving output electrode and the second semiconductor each respectively have two portions and the two portions of each of the driving output electrode and the second semiconductor are separated from each other at opposite sides with respect to the third signal line.

8. The organic light emitting device of claim 1, wherein the driving input electrode comprises a first portion and a second portion separated from the first portion of the driving input electrode, and further comprises:

a first driving voltage line connected to the first portion of the driving input electrode; and

a second driving voltage line connected to the second portion of the driving input electrode.

9. The organic light emitting device of claim 8, wherein the etch stopper and the driving output electrode each include first and second portions separated from each other and formed with reverse symmetry.

10. The organic light emitting device of claim 9, wherein the first and second portions of the etch stopper include horseshoe shapes, the first and second portions of the driving output electrode respectively overlap inner portions of the first and second portions of the etch stopper, and the first and second portions of the driving input electrode respectively overlap outer portions of the first and second portions of the etch stopper.

11. The organic light emitting device of claim 10, further comprising a plurality of first electrodes, wherein the first and second portions of the driving output electrode are respectively connected to a same first electrode.

12. The organic light emitting device of claim 1, wherein the first and second semiconductors have different crystalline structures.

13. The organic light emitting device of claim 12, wherein the first semiconductor includes amorphous silicon and the second semiconductor includes polycrystalline silicon or microcrystalline silicon.

14. The organic light emitting device of claim 1, wherein the first and the second semiconductors are made of polycrystalline silicon or microcrystalline silicon.

15. The organic light emitting device of claim 1, wherein the switching thin film transistor further comprises:

a switching control electrode connected to the first signal line under the first semiconductor and insulated from the first semiconductor;

a switching input electrode connected to the second signal line and overlapping the first semiconductor; and

a switching output electrode connected to the driving control electrode and facing the switching input electrode on the first semiconductor.

16. The organic light emitting device of claim 15, wherein the switching control electrode is made with a same layer as the driving input electrode and the driving output electrode, and the switching input electrode and the switching output electrode are made with a same layer as the driving control electrode.

17. The organic light emitting device of claim 16, wherein the switching control electrode and the driving control electrode are formed on an insulating layer covering the driving input electrode and the driving output electrode.

18. The organic light emitting device of claim 15, wherein the driving input electrode, the driving output electrode, the switching input electrode, and the switching output electrode are made with a same layer.

19. The organic light emitting device of claim 18, wherein the switching control electrode and the driving control electrode are made with a same layer.

20. The organic light emitting device of claim 19, further comprising a connecting member connecting the driving control electrode to the switching output electrode and made of a same layer as the first electrode.

21. The organic light emitting device of claim 15, wherein the switching control electrode and the driving control electrode, the driving input electrode and the driving output electrode, and the switching input electrode and the switching output electrode are made with different layers.

22. The organic light emitting device of claim 1, wherein overlapping portions between the etch stopper and the driving input and driving output electrodes are compensated to each other when misaligned from each other to substantially uniformly maintain characteristics of the driving thin film transistor.

23. A method for manufacturing an organic light emitting device, the method comprising:

forming a switching semiconductor and a driving semiconductor on a substrate;

respectively forming etch stoppers on the switching and driving semiconductors;

forming a driving voltage line including a driving input electrode, a driving output electrode, a data line including a switching input electrode, and a switching output electrode;

forming a gate insulating layer covering the driving voltage line, the driving output electrode, the data line, and the switching output electrode;

forming a gate line including a switching control electrode, and a driving control electrode; and

forming a pixel electrode connected to the driving output electrode, and a connecting member connecting the switching output electrode to the driving control electrode.

24. The method of claim 23, wherein forming the driving semiconductor includes forming first and second spaced portions of the driving semiconductor on the substrate, and forming a driving output electrode includes forming first and second portions surrounding and spaced from opposite ends of the driving input electrode and a connection connecting the first and second portions of the driving output electrode to each other.

25. A method for manufacturing an organic light emitting device, the method comprising:

forming a driving semiconductor on a substrate;

forming an etch stopper on the driving semiconductor;

forming a driving input electrode, a driving output electrode, and a gate line including a switching control electrode;

forming a gate insulating layer covering the gate line, the driving output electrode, and the driving output electrode;

forming a switching semiconductor on the gate insulating layer;

forming a driving voltage line, a data line including a switching input electrode, and a driving control electrode; and

forming a pixel electrode connected to the driving output electrode, and a connecting member connecting the driving voltage line to the driving input electrode.

26. A method for manufacturing an organic light emitting device, the method comprising:

forming a driving semiconductor on a substrate;

forming an etch stopper on the driving semiconductor;

forming a driving voltage line including a driving input electrode, and a driving output electrode;

forming an interlayer insulating layer covering the driving voltage line and the driving output electrode;

forming a gate line including a switching control electrode, and a driving control electrode on the interlayer insulating layer;

forming a gate insulating layer covering the gate line and the driving control electrode;

forming a switching semiconductor on the gate insulating layer;

forming a data line including a switching input electrode, and a switching output electrode; and

forming a pixel electrode connected to the driving output electrode, and a connecting member connecting the switching output electrode to the driving control electrode.

27. An organic light emitting device comprising:

a substrate;

first and second signal lines formed on the substrate;

a switching thin film transistor connected to the first and second signal lines and including a first semiconductor;

a driving thin film transistor including a second semiconductor, an etch stopper formed on the second semiconductor, driving input and driving output electrodes overlapping the etch stopper and the second semiconductor and opposite to each other with respect to the etch stopper, and a driving control electrode connected to the switching thin film transistor and overlapping the second semiconductor;

a first electrode connected to the driving output electrode;

a second electrode opposite to the first electrode; and

an organic light emitting member,

wherein at least one of the etch stopper, the driving input electrode, and the driving output electrode has rotation symmetry with respect to a vertical or horizontal central line.

28. The organic light emitting device of claim 27, wherein overlapping portions between the etch stopper, and the driving input electrode and driving output electrode include a donut shape.

29. The organic light emitting device of claim 28, wherein an overlapping portion between the etch stopper and the driving output electrode is disposed in an overlapping portion between the etch stopper and the driving input electrode.

30. The organic light emitting device of claim 27, wherein overlapping portions between the etch stopper and the driving input electrode and driving output electrode include an “

S”

shape.

31. The organic light emitting device of claim 30, wherein the driving input electrode is a curved driving input electrode, and the driving output electrode includes two portions enclosed by the curved driving input electrode.

32. The organic light emitting device of claim 27, wherein the first and second semiconductors have different crystalline structures.

33. The organic light emitting device of claim 32, wherein the first semiconductor is made of amorphous silicon and the second semiconductor is made of polycrystalline silicon or microcrystalline silicon.

34. The organic light emitting device of claim 27, wherein the switching thin film transistor further comprises:

a switching control electrode connected to the first signal line under the first semiconductor and insulated from the first semiconductor;

a switching input electrode connected to the second signal line and overlapping the first semiconductor; and

a switching output electrode connected to the driving control electrode and facing the switching input electrode on the first semiconductor.

35. The organic light emitting device of claim 34, further comprising a gate insulating layer covering the driving input electrode, the driving output electrode, and the etch stopper.

36. The organic light emitting device of claim 35, wherein the driving input electrode, the driving output electrode, and the switching control electrode are made with a same layer.

37. The organic light emitting device of claim 36, wherein the switching input electrode, the switching output electrode, and the driving control electrode are made with a same layer.