Organic light-emitting display device and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-2016149155-A1
Application number	US-201514725014-A
Country	US
Kind code	A1
Filing date	May 29, 2015
Priority date	Nov 25, 2014
Publication date	May 26, 2016
Grant date	—

Abstract

Provided are an organic light-emitting display device and method of manufacturing the same. An organic light-emitting display device includes: a thin-film transistor on a substrate, an auxiliary electrode member in a contact area on the substrate, the auxiliary electrode member being spaced apart from the thin-film transistor, an insulating member on the thin-film transistor and the auxiliary electrode member, the insulating member including an opening through which at least a part of the auxiliary electrode member is exposed in the contact area, and an organic light-emitting element on the insulating member, the organic light-emitting element including: an anode, an organic light-emitting layer, and a cathode, wherein a side surface of the opening is disposed closer to the inside of the opening than a side surface of the auxiliary electrode member, such that the cathode is in contact with the auxiliary electrode member without a reverse-tapered partitioning wall thereover.

First claim

What is claimed is:

1 . An organic light-emitting display device, comprising:
a thin-film transistor on a substrate; an auxiliary electrode member in a contact area on the substrate, the auxiliary electrode member being spaced apart from the thin-film transistor; an insulating member on the thin-film transistor and the auxiliary electrode member, the insulating member comprising an opening through which at least a part of the auxiliary electrode member is exposed in the contact area; and an organic light-emitting element on the insulating member, the organic light-emitting element comprising:
an anode;
an organic light-emitting layer; and
a cathode,
wherein a side surface of the opening is closer to the inside of the opening than a side surface of the auxiliary electrode member, such that the cathode is in contact with the auxiliary electrode member without a reverse-tapered partitioning wall thereover.

2 . The organic light-emitting display device of claim 1 , wherein:
the auxiliary electrode member comprises an exposed surface not in contact with the organic light-emitting layer in the contact area; and the cathode is in contact with the exposed surface of the auxiliary electrode member.

3 . The organic light-emitting display device of claim 2 , wherein a thickness of the auxiliary electrode member is greater than a thickness of the organic light-emitting layer.

4 . The organic light-emitting display device of claim 1 , wherein:
the thin-film transistor comprises:
a gate electrode;
an active layer;
a source electrode; and
a drain electrode;
the auxiliary electrode member comprises:
a first auxiliary electrode; and
a second auxiliary electrode on the first auxiliary electrode;
a side surface of the first auxiliary electrode is closer to the inside of the opening than a side surface of the second auxiliary electrode; the first auxiliary electrode comprises a same material as that of the gate electrode; and the second auxiliary electrode comprises a same material as that of the source electrode or the drain electrode.

5 . The organic light-emitting display device of claim 4 , wherein the first auxiliary electrode comprises a material having a lower etching selectivity than an etching selectivity of the second auxiliary electrode, with respect to an etchant for etching the second auxiliary electrode.

6 . The organic light-emitting diode device of claim 1 , wherein the auxiliary electrode member comprises an eaves structure.

7 . The organic light-emitting diode device of claim 6 , wherein the eaves structure comprises a same material as that of the thin-film transistor and the insulating member.

8 . An organic light-emitting display device, comprising:
a thin-film transistor on a substrate, the thin-film transistor comprising:
a gate electrode;
an active layer;
a source electrode; and
a drain electrode;
a first auxiliary electrode spaced apart from the gate electrode, the first auxiliary electrode comprising an exposed top surface in a contact area on the substrate; a second auxiliary electrode on the first auxiliary electrode, the second auxiliary electrode comprising an exposed side surface in the contact area; a passivation layer on the second auxiliary electrode, the passivation layer comprising an exposed bottom surface in the contact area; an anode electrically connected to the thin-film transistor; an organic light-emitting layer on the anode; and a cathode on the organic light-emitting layer, wherein the cathode is in contact with the exposed top surface of the first auxiliary electrode or the exposed side surface of the second auxiliary electrode in the contact area.

9 . The organic light-emitting display device of claim 8 , wherein a side surface of the first auxiliary electrode protrudes more than the exposed side surface of the second auxiliary electrode.

10 . The organic light-emitting display device of claim 9 , wherein the first auxiliary electrode comprises a material having a lower etching selectivity than an etching selectivity of the second auxiliary electrode, with respect to an etchant for etching the second auxiliary electrode.

11 . The organic light-emitting display device of claim 8 , wherein a distance from a bottom surface of the first auxiliary electrode to the exposed bottom surface of the passivation layer is greater than a thickness of the organic light-emitting layer.

12 . The organic light-emitting display device of claim 8 , wherein:
the first auxiliary electrode comprises a same material as that of the gate electrode; and the second auxiliary electrode comprises a same material as that of the source electrode or the drain electrode.

13 . The organic light-emitting display device of claim 12 , wherein:
the first auxiliary electrode comprises:
a lower layer comprising an exposed top surface in the contact area; and
an upper layer comprising an exposed side surface in the contact area; and
a side surface of the lower layer protrudes more than the exposed side surface of the upper layer in the contact area.

14 . The organic light-emitting display device of claim 8 , wherein a same voltage is applied to the cathode, the first auxiliary electrode, and the second auxiliary electrode.

15 . The organic light-emitting display device of claim 8 , wherein:
the first auxiliary electrode is extended in a particular direction; a part of a top surface of both sides of the first auxiliary electrode is exposed in the contact area; and a side surface of the first auxiliary electrode protrudes more than the exposed side surface of the second auxiliary electrode in the contact area.

16 . The organic light-emitting display device of claim 8 , wherein:
the first auxiliary electrode is extended in a particular direction; the first auxiliary electrode comprises an extended portion protruding from the first auxiliary electrode in the contact area; the second auxiliary electrode is disposed within the extended portion; and a part of the top surface of the extended portion of the first auxiliary electrode is exposed in the contact area.

17 . The organic light-emitting display device of claim 8 , wherein:
the anode comprises:
a reflective layer; and
a first transparent electrode on the reflective layer;
the cathode comprises:
a metal electrode; and
a second transparent electrode on the metal electrode; and
the second transparent electrode of the cathode is in contact with the exposed top surface of the first auxiliary electrode or the exposed side surface of the second auxiliary electrode in the contact area.

18 . A method of manufacturing an organic light-emitting display device, the method comprising:
providing a gate electrode and a first auxiliary electrode spaced apart from each other on a substrate; providing a second auxiliary electrode in contact with the first auxiliary electrode, a source electrode, and a drain electrode separated from the gate electrode; providing a passivation layer over the source electrode, the drain electrode, and a top surface of the second auxiliary electrode; removing a part of the passivation layer and a part of the second auxiliary electrode, such that a side surface of the second auxiliary electrode and a part of a top surface of the first auxiliary electrode are exposed in a contact area; providing an anode electrically connected to the source electrode or drain electrode; providing an organic light-emitting layer on the anode; and providing a cathode on the organic light-emitti

Assignees

• Lg Display Co Ltd

Inventors

• Kim Kyungman

Classifications

• H10K59/80522 Primary

  combined with auxiliary electrodes · CPC title

• H10K59/80518

  Reflective anodes, e.g. ITO combined with thick metallic layers · CPC title

• H10K50/824

  combined with auxiliary electrodes · CPC title

• H10K59/124 Primary

  Insulating layers formed between TFT elements and OLED elements · CPC title

• H01L51/56

  Electricity · mapped topic