Display panel, electronic device including the same, and method for manufacturing display panel

Patent metadata

Field	Value
Publication number	US-12507573-B2
Application number	US-202217903572-A
Country	US
Kind code	B2
Filing date	Sep 6, 2022
Priority date	Oct 22, 2021
Publication date	Dec 23, 2025
Grant date	Dec 23, 2025

Abstract

A display panel includes a circuit layer on a base substrate, a first electrode and an auxiliary electrode disposed on the circuit layer, and spaced apart from each other, a charge generation layer on the first electrode and the auxiliary electrode, a first opening region being defined in the charge generation layer, a second electrode on the charge generation layer, a first organic layer disposed between the first electrode and the charge generation layer, a second opening region being defined in the first organic layer, and a second organic layer disposed between the charge generation layer and the second electrode, a third opening region being defined in the second organic layer. The second electrode is electrically connected to the auxiliary electrode through the first to third opening regions, and the second organic layer includes a protrusion adjacent to the third opening region.

First claim

What is claimed is:

1 . A display panel comprising:
a circuit layer disposed on a base substrate; a first electrode disposed in a first region on the circuit layer; an auxiliary electrode disposed in a second region on the circuit layer and spaced apart from the first electrode; a charge generation layer disposed on the first electrode and the auxiliary electrode, a first opening region being defined in the charge generation layer; a second electrode disposed on the charge generation layer; a first organic layer disposed between the first electrode and the charge generation layer, a second opening region being defined in the first organic layer; and a second organic layer disposed between the charge generation layer and the second electrode, a third opening region being defined in the second organic layer, wherein the second electrode is electrically connected to the auxiliary electrode through the first, second, and third opening regions, and the second organic layer includes a protrusion of the second organic layer adjacent to the third opening region.

2 . The display panel of claim 1 , wherein
the charge generation layer includes a curved surface adjacent to the first opening region, and the second electrode is spaced apart from the curved surface of the charge generation layer.

3 . The display panel of claim 2 , wherein the second organic layer covers the curved surface of the charge generation layer.

4 . The display panel of claim 2 , wherein the curved surface of the charge generation layer overlaps the protrusion of the second organic layer in a plan view.

5 . The display panel of claim 1 , wherein the protrusion of the second organic layer surrounds the third opening region in a plan view.

6 . The display panel of claim 1 , wherein
the protrusion of the second organic layer has a ring shape surrounding the third opening region in a plan view, and a diameter of the protrusion of the second organic layer is equal to or greater than about 1.2 times and equal to or smaller than about 1.4 times a diameter of the third opening region.

7 . The display panel of claim 1 , wherein a thickness from a top surface of the protrusion of the second organic layer to a bottom surface of the first organic layer is equal to or greater than about 1.3 times and equal to or smaller than about 1.5 times a thickness from a top surface of a portion of the second organic layer not overlapping the protrusion of the second organic layer to the bottom surface of the first organic layer.

8 . The display panel of claim 1 , wherein the charge generation layer contains a metallic material.

9 . The display panel of claim 1 , wherein a thickness of the charge generation layer is equal to or greater than about 1 angstrom (Å) and equal to or smaller than about 150 angstrom (Å).

10 . The display panel of claim 1 , wherein
the first organic layer includes a first light emitting layer overlapping the first electrode in a plan view, the second organic layer includes a second light emitting layer overlapping the first electrode in a plan view, and a color of light emitted from the first light emitting layer is different from a color of light emitted from the second light emitting layer.

11 . The display panel of claim 1 , wherein
the first organic layer includes a first light emitting layer overlapping the first electrode in a plan view, the second organic layer includes a second light emitting layer overlapping the first electrode in a plan view, and a color of light emitted from the first light emitting layer is substantially identical to a color of light emitted from the second light emitting layer.

12 . The display panel of claim 1 , further comprising:
a capping layer disposed on the second electrode; and an encapsulation layer disposed on the capping layer, wherein the encapsulation layer includes:
a plurality of inorganic films; and
at least one organic film disposed between the plurality of inorganic films.

13 . An electronic device comprising:
a display panel that is capable of displaying an image; an electronic module disposed beneath the display panel; and a casing accommodating the display panel and the electronic module, wherein the display panel includes:
a circuit layer disposed on a base substrate;
a first electrode disposed in a first region on the circuit layer;
an auxiliary electrode disposed in a second region on the circuit layer and spaced apart from the first electrode;
a second electrode disposed on the first electrode and the auxiliary electrode;
a plurality of organic layers disposed between the first electrode and the second electrode; and
at least one charge generation layer disposed between the plurality of organic layers, wherein
each organic layer of the plurality of organic layers and the charge generation layer includes an opening region directly over the auxiliary electrode, the second electrode is electrically connected to the auxiliary electrode through each opening region of the plurality of organic layers and the charge generation layer, an organic layer disposed adjacent to the second electrode among the plurality of organic layers includes a protrusion adjacent to the opening region of the organic layer disposed adjacent to the second electrode, and at least another organic layer besides the organic layer disposed adjacent to the second electrode includes no protrusion adjacent to the opening region.

14 . The electronic device of claim 13 , wherein
the charge generation layer includes a curved surface adjacent to the opening region, the curved surface of the charge generation layer is spaced apart from the second electrode, and the protrusion of the organic layer is disposed between the curved surface of the charge generation layer and the second electrode.

15 . The electronic device of claim 13 , wherein
the protrusion of the organic layer disposed adjacent to the second electrode surrounds the opening region of each opening region of the plurality of organic layers in a plan view, and the organic layer disposed adjacent to the second electrode directly contacts at least one of the auxiliary electrode and another organic layer of the plurality of organic layers.

16 . A method for manufacturing a display panel, the method comprising:
providing a target substrate including:
a pixel electrode; and
an auxiliary electrode, the auxiliary electrode and the pixel electrode being disposed on a same layer;
forming a light emitting stack including a charge generation layer on the pixel electrode and the auxiliary electrode; forming an opening region penetrating the light emitting stack and forming a protrusion adjacent to the opening region by irradiating a laser onto the light emitting stack overlapping the auxiliary electrode in a plan view; and forming a common electrode on the light emitting stack, wherein the common electrode is electrically connected to the auxiliary electrode through the opening region.

17 . The method of claim 16 , wherein the forming of the opening region includes:
bending an end of the charge generation layer adjacent to the opening region, wherein the common electrode formed to overlap the opening region in a plan view is spaced apart from the end of the charge generation layer.

18 . The method of claim 16 , wherein the laser is a Gaussian beam.

19 . The method of claim 16 , wherein a fluence of the laser is equal to or lower than about 200 mJ/cm 2 .

20 . The method of

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Seho
• Kim Taehyung
• Yoon Jihwan
• Lee Yongdae
• Pyo Sangwoo
• Hwang Jaehoon

Classifications

• H10K71/162

  using laser ablation · CPC title

• H10K50/13

  comprising stacked EL layers within one EL unit · CPC title

• H10K50/824

  combined with auxiliary electrodes · CPC title

• H10K50/19 Primary

  Tandem OLEDs · CPC title

• H10K59/353

  characterised by the geometrical arrangement of the RGB subpixels · CPC title