Electroluminescence display device having a through-hole in display area

Patent metadata

Field	Value
Publication number	US-2020144535-A1
Application number	US-201916670467-A
Country	US
Kind code	A1
Filing date	Oct 31, 2019
Priority date	Nov 1, 2018
Publication date	May 7, 2020
Grant date	—

Abstract

An electroluminescence display device having a through-hole in a display area is discussed. The electroluminescence display device can include a substrate, a through-hole, an inner dam, and a hole-trench. The substrate includes a display area where a plurality of pixels for displaying images are arranged, and a non-display area surrounding the display area. The through-hole is arranged inside the display area. The inner dam surrounds the through-hole. The hole-trench surrounds the inner dam, and is formed as the substrate is partially recessed as much as a certain thickness.

First claim

What is claimed is:

1 . An electroluminescence display device comprising:
a substrate having a display area and a non-display area surrounding the display area, the display area having a plurality of pixels for displaying images; a through-hole arranged inside the display area; an inner dam surrounding the through-hole; and a hole-trench surrounding the inner dam, and formed as the substrate is partially recessed as much as a certain thickness.

2 . The electroluminescence display device of claim 1 , wherein the display area includes:
a light emitting diode configured to provide image information; and a driving element configured to drive the light emitting diode, and wherein the through-hole is formed by removing the substrate, the light emitting diode and the driving element.

3 . The electroluminescence display device of claim 2 , wherein the hole-trench includes:
a bottom surface defined at a position more recessed at a certain depth than an upper surface of the substrate; an upper surface defined on the upper surface of the substrate; and a sidewall for connecting the bottom surface of the hole-trench with the upper surface of the hole-trench, and wherein a light emitting layer of the light emitting diode is arranged on the bottom surface of the hole-trench and the upper surface of the hole-trench, except for the sidewall of the hole-trench.

4 . The electroluminescence display device of claim 1 , wherein the hole-trench has a well shape recessed by removing the substrate with approximately 20% of thickness at least and approximately 70% of thickness at most.

5 . The electroluminescence display device of claim 1 , wherein the hole-trench is arranged between the inner dam and adjacent pixels arranged to be close to the inner dam among the pixels.

6 . The electroluminescence display device of claim 1 , wherein the hole-trench has a closed curve shape corresponding to a shape of the through-hole.

7 . The electroluminescence display device of claim 1 , wherein the hole-trench has any one of a polygonal shape, a circular shape and an oval shape, which surrounds the through-hole.

8 . The electroluminescence display device of claim 1 , wherein the hole-trench has a width narrower than a width of the inner dam.

9 . The electroluminescence display device of claim 1 , wherein the inner dam includes:
a first inner dam adjacent to the through-hole; and a second inner dam surrounding the first inner dam.

10 . The electroluminescence display device of claim 9 , wherein the hole-trench is arranged between the first inner dam and the second inner dam.

11 . The electroluminescence display device of claim 1 , further comprising:
a thin film transistor layer formed on the substrate; a planarization layer covering the thin film transistor layer; an anode electrode connected with a thin film transistor arranged in the thin film transistor layer and arranged on the planarization layer; and a bank defining a light emitting area in the anode electrode, wherein the hole-trench passes through the bank, the planarization layer and the thin film transistor layer, and is formed by removing the substrate as much as a certain thickness.

12 . The electroluminescence display device of claim 11 , wherein the inner dam further includes a spacer arranged on the planarization layer and the bank, the spacer surrounding the through-hole.

13 . The electroluminescence display device of claim 11 , further comprising:
an outer dam arranged in the non-display area, surrounding the display area; a light emitting layer covering the pixels, the inner dam and the hole-trench on the substrate between the outer dam and the through-hole; a cathode electrode arranged on the light emitting layer; and an encapsulation layer covering the cathode electrode.

14 . The electroluminescence display device of claim 13 ,
wherein the light emitting layer is exposed from a sidewall of the through-hole.

15 . The electroluminescence display device of claim 14 , wherein the encapsulation layer includes:
a first inorganic encapsulation layer; an organic encapsulation layer arranged on the first inorganic encapsulation layer; and a second inorganic encapsulation layer arranged on an upper surface of the organic encapsulation layer.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Junggi

Classifications

• H01L27/3234

  Electricity · mapped topic

• H01L51/5246 Primary

  Electricity · mapped topic

• H01L51/5253

  Electricity · mapped topic

• H01L27/3244

  Electricity · mapped topic

• H10K50/844

  Encapsulations · CPC title