Transparent display apparatus

Patent metadata

Field	Value
Publication number	US-2026090249-A1
Application number	US-202519270993-A
Country	US
Kind code	A1
Filing date	Jul 16, 2025
Priority date	Sep 20, 2024
Publication date	Mar 26, 2026
Grant date	—

Abstract

A transparent display apparatus according to one or more examples may include a substrate, a transmissive area, a non-transmissive area including a light emission area in which a light emitting element is disposed, a circuit layer on the substrate, the circuit layer having an auxiliary power electrode disposed in the transmissive area and at least one thin film transistor disposed in the non-transmissive area, a plurality of inorganic protective layers and a plurality of organic protective layers on the circuit layer, and an undercut structure including at least one undercut region formed by a lower inorganic protective layer and an upper organic protective layer, which are adjacent to each other among the plurality of inorganic protective layers and the plurality of organic protective layers.

First claim

What is claimed is:

1 . A transparent display apparatus, comprising:
a substrate; a transmissive area; a non-transmissive area including a light emission area in which a light emitting element is disposed; a circuit layer on the substrate, the circuit layer having an auxiliary power electrode disposed in the transmissive area and at least one thin film transistor disposed in the non-transmissive area; a plurality of inorganic protective layers and a plurality of organic protective layers on the circuit layer; and an undercut structure including at least one undercut region formed by a lower inorganic protective layer and an upper organic protective layer, which are adjacent to each other among the plurality of inorganic protective layers and the plurality of organic protective layers.

2 . The transparent display apparatus of claim 1 , wherein the plurality of inorganic protective layers and the plurality of organic protective layers are alternately arranged in sequence.

3 . The transparent display apparatus of claim 1 , wherein one of the plurality of inorganic protective layers is between the plurality of organic protective layers, and one of the plurality of organic protective layers is between the plurality of inorganic protective layers.

4 . The transparent display apparatus of claim 1 , wherein the undercut structure includes:
a first undercut structure configured to form a contact portion that exposes a portion of the auxiliary power electrode; and a second undercut structure configured to form a bank portion that defines an opening of a pixel electrode included in the light emitting element.

5 . The transparent display apparatus of claim 4 , wherein the first undercut structure includes a plurality of undercut regions, and the second undercut structure includes a single undercut region.

6 . The transparent display apparatus of claim 4 , wherein the first undercut structure includes:
a first undercut region on the auxiliary power electrode; and a second undercut region in a different layer from the first undercut region, and wherein the second undercut structure includes a third undercut region in a same layer as the second undercut region.

7 . The transparent display apparatus of claim 1 , wherein the plurality of inorganic protective layers and the plurality of organic protective layers include:
a first inorganic protective layer on the circuit layer; a first organic protective layer on the first inorganic protective layer; a second inorganic protective layer on the first organic protective layer; and a second organic protective layer on the second inorganic protective layer.

8 . The transparent display apparatus of claim 7 , wherein the undercut structure includes:
a first undercut structure formed of the first inorganic protective layer, the first organic protective layer, the second inorganic protective layer, and the second organic protective layer; and a second undercut structure formed of the second inorganic protective layer and the second organic protective layer.

9 . The transparent display apparatus of claim 8 , wherein the first undercut structure includes:
a first support pattern disposed on a portion of the auxiliary power electrode and formed of a same material as the first inorganic protective layer; a first eaves pattern disposed on the first support pattern, protruding from the first support pattern, and formed of a same material as the first organic protective layer; a second support pattern disposed on the first eaves pattern and formed of a same material as the second inorganic protective layer; and a second eaves pattern disposed on the second support pattern, protruding from the second support pattern, and formed of a same material as the second organic protective layer.

10 . The transparent display apparatus of claim 9 , wherein the first undercut structure includes:
a first undercut region below the first eaves pattern protruding from the first support pattern; and a second undercut region below the second eaves pattern protruding from the second support pattern.

11 . The transparent display apparatus of claim 8 , wherein the second undercut structure includes:
a third support pattern disposed at a certain distance from the pixel electrode included in the light emitting element on the first organic protective layer and formed of a same material as the second inorganic protective layer; and a third eaves pattern disposed on the third support pattern, protruding from the third support pattern, and formed of a same material as the second organic protective layer.

12 . The transparent display apparatus of claim 11 , wherein the second undercut structure includes a third undercut region below the third eaves pattern protruding from the third support pattern.

13 . The transparent display apparatus of claim 11 , wherein the light emitting element further includes a dummy pixel electrode on the third eaves pattern, and
wherein the dummy pixel electrode is an island pattern separated from the pixel electrode.

14 . The transparent display apparatus of claim 13 , wherein the dummy pixel electrode is formed on at least a portion of the third eaves pattern.

15 . The transparent display apparatus of claim 8 , wherein the plurality of inorganic protective layers and the plurality of organic protective layers further include a third organic protective layer, and
wherein the transparent display apparatus further comprises: a protruding pattern formed of a same material as the third organic protective layer and protruding from the first undercut structure; and a cover pattern formed of the same material as the third organic protective layer and covering an edge portion of the pixel electrode included in the light emitting element on the first organic protective layer and the second undercut structure.

16 . The transparent display apparatus of claim 15 , wherein the protruding pattern is configured to have a width narrower than an uppermost surface of the first undercut structure and to protrude in an upward direction from the uppermost surface.

17 . The transparent display apparatus of claim 15 , wherein the cover pattern is configured to have a width wider than a width of the second undercut structure and to define an opening of the pixel electrode.

18 . The transparent display apparatus of claim 8 , wherein the non-transmissive area includes the first organic protective layer, and
wherein the transmissive area is where at least a portion of the first organic protective layer is removed.

19 . The transparent display apparatus of claim 18 , further comprising a third undercut structure formed on at least a portion of a surrounding perimeter of the first undercut structure.

20 . The transparent display apparatus of claim 19 , wherein the third undercut structure is formed of a same material as the first inorganic protective layer and the first organic protective layer.

21 . The transparent display apparatus of claim 8 , wherein the light emitting element includes:
a pixel electrode disposed on the first organic protective layer and electrically connected to the at least one thin film transistor; a bank portion disposed on the first organic protective layer, including the second undercut structure, and defining an opening of the pixel electrode; a dummy pixel electrode disposed on the bank portion; an organic light emitting layer disposed on the pixel electrode and the dummy pixel electrode; a

Assignees

• Lg Display Co Ltd

Inventors

• Kim Choonghyo
• Kwon Hoiyong
• Song Jihun

Classifications

• H10K59/123

  Connection of the pixel electrodes to the thin film transistors [TFT] · CPC title

• H10K59/38

  comprising colour filters or colour changing media [CCM] · CPC title

• H10K59/122

  Pixel-defining structures or layers, e.g. banks · CPC title

• H10K2102/351

  Thickness · CPC title

• H10K59/88

  Dummy elements, i.e. elements having non-functional features · CPC title