Light emitting display device and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-12262601-B2
Application number	US-202017113837-A
Country	US
Kind code	B2
Filing date	Dec 7, 2020
Priority date	Apr 21, 2020
Publication date	Mar 25, 2025
Grant date	Mar 25, 2025

Abstract

A light emitting display device includes a substrate including a display area and a non-display area adjacent to the display area; a lower pad electrode on the substrate in the non-display area; a planarization layer overlapping the lower electrode; an upper pad electrode on the lower pad electrode and overlapping at least a portion of the lower planarization layer. The planarization layer includes an opening exposing an upper surface of the lower pad electrode, the lower pad electrode and the upper pad electrode are electrically connected to each other through the opening, the lower planarization layer includes an exposed portion exposing an upper surface of the lower planarization layer, and an overlapping portion overlapping at least a portion of the upper pad electrode, and a height of the upper surface of the exposed portion is lower than a height of an upper surface of the overlapping portion.

First claim

What is claimed is:

1. A light emitting display device comprising:
a substrate that includes a display area and a non-display area adjacent to the display area;
a lower pad electrode disposed on the substrate in the non-display area;
a planarization layer made of an organic material that overlaps a portion of the lower pad electrode; and
an upper pad electrode disposed on the lower pad electrode and overlapping at least a portion of the planarization layer, wherein
the planarization layer includes an opening that exposes an upper surface of the lower pad electrode,
the lower pad electrode and the upper pad electrode are electrically connected to each other through the opening,
the planarization layer includes:
an exposed portion where a first upper surface of the planarization layer does not contact the upper pad electrode; and
an overlapping portion that overlaps at least a portion of the upper pad electrode such that a bottom surface of the upper pad electrode directly contacts a second upper surface of the planarization layer at the overlapping portion,
a first height of the planarization layer at the first upper surface of the planarization layer at the exposed portion is lower than a second height of the planarization layer at the second upper surface of the planarization layer at the overlapping portion,
an inclined surface extending an entire distance from the first upper surface of the planarization layer at the exposed portion to the second upper surface of the planarization layer at the overlapping portion, and
an upper edge of the inclined surface directly contacts an edge of the portion of the upper pad electrode overlapping the overlapping portion of the planarization layer.

2. The light emitting display device of claim 1 , wherein
the upper pad electrode includes an upper layer including titanium (Ti), an intermediate layer including aluminum (Al), and a lower layer including titanium (Ti), and
the lower pad electrode includes an upper layer including titanium (Ti), an intermediate layer including aluminum (Al), and a lower layer including titanium (Ti).

3. The light emitting display device of claim 1 , wherein
the planarization layer includes at least one of a polyimide, a polyamide, an acrylic resin, benzocyclobutene, and a phenol resin.

4. The light emitting display device of claim 1 , wherein
the display area includes:
a semiconductor layer disposed on the substrate;
a gate insulating layer that overlaps the semiconductor layer;
a gate electrode disposed on the gate insulating layer;
an interlayer insulating layer that overlaps the gate electrode; and
a source electrode and a drain electrode that are disposed on the interlayer insulating layer and electrically connected to the semiconductor layer, and
the lower pad electrode, the source electrode, and the drain electrode are disposed on a same layer.

5. The light emitting display device of claim 4 , further comprising:
a pixel electrode disposed on the planarization layer;
an emission layer disposed on the pixel electrode; and
a common electrode disposed on the emission layer, wherein
the planarization layer overlaps the source electrode and the drain electrode, and includes a via hole, and
the drain electrode and the pixel electrode are electrically connected by the via hole.

6. The light emitting display device of claim 5 , wherein
the display area includes:
an encapsulation layer that overlaps the common electrode;
a sensing insulating layer disposed on the encapsulation layer;
sensing electrodes disposed on the sensing insulating layer; and
an inorganic passivation layer that overlaps the sensing electrodes, and
the sensing electrodes and the upper pad electrode are disposed on a same layer.

7. The light emitting display device of claim 6 , further comprising:
a buffer layer disposed between the encapsulation layer and the sensing insulating layer and disposed between the lower pad electrode and the upper pad electrode,
wherein the lower pad electrode and the upper pad electrode are electrically connected to each other.

8. A light emitting display device comprising:
a substrate that includes a display area and a non-display area adjacent to the display area;
a lower pad electrode disposed on the substrate in the non-display area;
an upper pad electrode disposed on a pad inorganic insulating layer;
an inorganic passivation layer disposed on the upper pad electrode;
a planarization layer made of an organic material and disposed on the inorganic passivation layer, wherein
a first end of the planarization layer is aligned with a first end of the inorganic passivation layer,
a second end of the planarization layer is aligned with a second end of the inorganic passivation layer,
the first end and the second end of the planarization layer are respective parts of an opening of the planarization layer and facing each other,
the first end and the second end of the inorganic passivation layer are respective parts of an opening of the inorganic passivation layer and facing each other,
the first end of the planarization layer and the first end of the inorganic passivation layer overlap the upper pad electrode in plan view, and
the second end of the inorganic passivation layer and the second end of the planarization layer are spaced apart from the upper pad electrode so a side surface of the upper pad electrode is exposed by the inorganic passivation layer and the planarization layer.

9. The light emitting display device of claim 8 , wherein
a lower surface of the first end of the planarization layer is aligned with an upper surface of the first end of the inorganic passivation layer.

10. The light emitting display device of claim 8 , wherein
the inorganic passivation layer partially overlaps the upper pad electrode, and
an upper surface of the upper pad electrode is partially exposed by the inorganic passivation layer.

11. The light emitting display device of claim 8 , wherein
the inorganic passivation layer is disposed on the pad inorganic insulating layer.

12. The light emitting display device of claim 8 , wherein a location where the first end of the planarization layer is aligned with the first end of the inorganic passivation layer is spaced apart from the upper pad electrode in plan view.

13. The light emitting display device of claim 8 , wherein the inorganic passivation layer directly contacts the pad inorganic insulating layer.

14. The light emitting display device of claim 8 , wherein the inorganic passivation layer covers a touch sensing electrode.

15. The light emitting display device of claim 8 , further comprising at least one of a color filter and a light blocking member disposed between the planarization layer and the inorganic passivation layer.

Assignees

• Samsung Display Co Ltd

Inventors

• An Chi Wook
• Cho Seong Min
• Ji Mi-Ran
• Kim Chan Young
• Lee Yeong Ho

Classifications

• H10K59/12 Primary

  Active-matrix OLED [AMOLED] displays · CPC title

• H10K59/8792

  comprising light absorbing layers, e.g. black layers · CPC title

• H10K59/40

  OLEDs integrated with touch screens · CPC title

• H10K2102/351

  Thickness · CPC title

• H10K59/1201

  Manufacture or treatment · CPC title