Organic light-emitting display device

• US 10,998,395 B2
• Filed: 10/22/2019
• Issued: 05/04/2021
• Est. Priority Date: 10/31/2018
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Han, Joon-Soo, Kang, Im-Kuk, Ha, Jung-Woo
• Primary Examiner(s): Sefer, Ahmed N
• Application Number:
  US16/660,183
• Publication Number:
  US 20200135838A1
• Time in Patent Office: 560 Days
• CPC Class Codes: H10K 10/84 Ohmic electrodes, e.g. source or drain electrodes
• CPC Class Codes: H10K 50/824 combined with auxiliary electrodes
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]
• CPC Class Codes: H10K 59/124 Insulating layers formed between TFT elements and OLED elements
• CPC Class Codes: H10K 59/127 comprising two substrates, e.g. display comprising OLED array and TFT driving circuitry on different substrates
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/1315 comprising structures specially adapted for lowering the resistance
• CPC Class Codes: H10K 59/8052 Cathodes

Abstract

An organic light-emitting display device comprises a substrate comprising a plurality of sub-pixels, each of the sub-pixels having an emission area and a non-emission area provided to surround the emission area; an auxiliary line disposed in the non-emission area; a first insulating film having a first hole configured to expose a portion of the auxiliary line; an auxiliary line connection pattern disposed on the first insulating film having a protruding portion protruding towards a center of the first hole and overlapping the auxiliary line; at least one bump disposed on the auxiliary line within the first hole and adjacent to the protruding portion of the auxiliary line connection pattern; and a bank having a second hole larger than the first hole to expose the protruding portion of the auxiliary line connection, thereby lowering resistance of a cathode covering a plurality of sub-pixels and preventing lateral current leakage between the sub-pixels through a change of the connection structure between the auxiliary line and the cathode.

Claims

1. An organic light-emitting display device comprising:

a substrate comprising a plurality of sub-pixels, each of the sub-pixels having an emission area and a non-emission area provided to surround the emission area;

an auxiliary line disposed in the non-emission area;

a first insulating film having a first hole configured to expose a portion of the auxiliary line;

an auxiliary line connection pattern disposed on the first insulating film having a protruding portion protruding towards a center of the first hole and overlapping the auxiliary line;

at least one bump disposed on the auxiliary line within the first hole and adjacent to the protruding portion of the auxiliary line connection pattern, the at least one bump being spaced apart from the first insulating film; and

a bank having a second hole larger than the first hole to expose the protruding portion of the auxiliary line connection pattern,

wherein the first insulating film includes an inorganic film and the at least one bump includes a same material as the first insulating film.

2. The organic light-emitting display device according to claim 1, further comprising a cathode configured to be directly connected to the auxiliary line within a space under the protruding portion of the auxiliary line connection pattern.

3. The organic light-emitting display device according to claim 2, further comprising an organic film between the bank and the cathode.

4. The organic light-emitting display device according to claim 3, further comprising an anode disposed in a same layer as the auxiliary line connection pattern and an organic functional layer disposed in a same layer as the organic film in the emission area,

wherein the anode, the organic functional layer and the cathode are sequentially stacked in the emission area and form an organic light-emitting diode.

5. The organic light-emitting display device according to claim 2, further comprising an organic film in an island shape disposed on an upper surface of the at least one bump, wherein the cathode covers the organic film on the upper surface of the at least one bump.

6. The organic light-emitting display device according to claim 5, wherein the at least one bump has a flat upper surface and tapered lateral surface.

7. The organic light-emitting display device according to claim 6, wherein a thickness of the organic film on the flat upper surface of at least one bump is thicker than a thickness of the organic film on the tapered lateral surface of at least one bump.

8. The organic light-emitting display device according to claim 1, wherein the at least one bump has a smaller height than the first insulating film.

9. The organic light-emitting display device according to claim 1, wherein the at least one bump has a same height as the first insulating film.

10. The organic light-emitting display device according to claim 9, further comprising an auxiliary electrode divergence portion diverging from the auxiliary line connection pattern and provided on the at least one bump.

11. The organic light-emitting display device according to claim 10, wherein the auxiliary electrode divergence portion laterally protrudes from an upper surface of the at least one bump.

12. The organic light-emitting display device according to claim 10, wherein the auxiliary line connection pattern is located at at least two sides of the first hole and the auxiliary line connection pattern comprises an additional divergence portion located at a side the other side from the two sides of the first hole.

13. The organic light-emitting display device according to claim 1, further comprising a connection portion between the auxiliary line and the auxiliary line connection pattern, wherein the connection portion penetrates the first insulating film in a region where the connection portion overlaps the bank.

14. The organic light-emitting display device according to claim 13, further comprising a second insulating film disposed between the first insulating film and the bank,

wherein the second insulation film has a third hole exposing the connection portion and the first hole.

15. The organic light-emitting display device according to claim 14, wherein the second insulating film includes an organic film.

16. The organic light-emitting display device according to claim 1, wherein the at least one bump is laterally spaced apart from the auxiliary line connection pattern within an interval of about 5 μ

m.

17. An organic light-emitting display device comprising:

a substrate comprising a plurality of sub-pixels, each of the sub-pixels having an emission area and a non-emission area surrounding the emission area;

an auxiliary line disposed in the non-emission area;

a first insulating film having a first hole exposing a portion of the auxiliary line;

an island shape bump disposed on the auxiliary line within the first hole;

an auxiliary line connection pattern having an overhanging portion and disposed in close proximity to the island shape bump; and

a cathode connecting with the auxiliary line in a space between the overhanging portion of the auxiliary line connection pattern and the auxiliary line,

wherein the first insulating film includes an inorganic film and the island shape bump includes a same material as the first insulating film.

18. The organic light-emitting display device according to claim 17, further comprising an auxiliary electrode divergence portion diverging from the auxiliary line connection pattern and provided on the island shape bump.

19. The organic light-emitting display device according to claim 18, wherein the auxiliary electrode divergence portion laterally protrudes from an upper surface of the island shape bump.

20. The organic light-emitting display device according to claim 18, wherein the auxiliary line connection pattern is located at at least two sides of the first hole and the auxiliary line connection pattern comprises an additional divergence portion located at other side from the two sides of the first hole.

21. The organic light-emitting display device according to claim 17, further comprising a connection portion between connecting with the auxiliary line and the auxiliary line connection pattern, wherein the connection portion penetrates the first insulating film in a region where the connection portion overlaps a bank.