Light emitting display device and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-2023046219-A1
Application number	US-202217584747-A
Country	US
Kind code	A1
Filing date	Jan 26, 2022
Priority date	Aug 4, 2021
Publication date	Feb 16, 2023
Grant date	—

Abstract

A light emitting display device includes a substrate, an organic layer, a conductor, an anode, and a pixel definition layer. The organic layer overlaps the substrate and has a connection opening. The conductor is positioned between the substrate and the organic layer. The anode is positioned on the organic layer and is partially positioned inside the connection opening. The pixel definition layer exposes an exposed portion of the anode. The organic layer has a halftone exposure portion and a neighboring portion. The halftone exposure portion overlaps the exposed portion of the anode and overlaps the conductor. The neighboring portion neighbors the halftone exposure portion. A face of the halftone exposure portion and a face of the neighboring portion are spaced from the substrate by a first distance and a second distance, respectively. A difference between the first distance and the second distance is 30 nm or less.

First claim

What is claimed is:

1 . A light emitting display device comprising:
a substrate; an organic layer overlapping the substrate and having an anode connection opening; a conductive layer positioned closer to the substrate than the organic layer; a conductive part positioned closer to the substrate than the conductive layer; an anode positioned on the organic layer and partially positioned inside the anode connection opening; a black pixel definition layer having an anode exposure opening that exposes an exposed portion of the anode; a cathode overlapping both the black pixel definition layer and the anode; and an encapsulation layer covering the cathode, wherein the organic layer has a halftone exposure portion and a neighboring portion, the halftone exposure portion overlaps the exposed portion of the anode and overlaps the conductive layer or the conductive part, the neighboring portion neighbors the halftone exposure portion and does not overlap the conductive layer, a face of the halftone exposure portion is spaced from the substrate by a first distance, a face of the neighboring portion is spaced from the substrate by a second distance, and a difference between the first distance and the second distance is equal to or less than 30 nm.

2 . The light emitting display device of claim 1 , wherein the organic layer includes a first organic layer and a second organic layer overlapping each other.

3 . The light emitting display device of claim 2 , wherein
the halftone exposure portion includes a first halftone exposure portion and a second halftone exposure portion, the first halftone exposure portion is included in the first organic layer, and the second halftone exposure portion is included in the second organic layer and overlaps the first halftone exposure portion.

4 . The light emitting display device of claim 3 , further comprising:
a red color filter; a green color filter; and a blue color filter, wherein the first halftone exposure portion and the second halftone exposure portion overlap one of the red color filter and the blue color filter, and the first organic layer further includes a green-pixel halftone exposure portion overlapping the green color filter.

5 . The light emitting display device of claim 4 , wherein
the conductive part overlaps the green color filter, and the conductive layer overlaps the red color filter or the blue color filter.

6 . The light emitting display device of claim 4 , wherein
a thickness of the first organic layer is greater than 1 μm and less than 2 μm, and a thickness of the second organic layer is greater than 1 μm and less than 2 μm.

7 . The light emitting display device of claim 4 , wherein
the anode connection opening includes a first opening and a second opening, the first opening is included in the first organic layer, the second opening is included in the second organic layer, and the first organic layer includes a stepped structure exposed by the second opening.

8 . The light emitting display device of claim 2 , wherein
the halftone exposure portion is included in only one of the first organic layer and the second organic layer.

9 . The light emitting display device of claim 8 , wherein
the halftone exposure portion is included in only the first organic layer.

10 . The light emitting display device of claim 1 , wherein
two opposite faces of the organic layer are formed of a same material and respectively directly contact the conductive layer and the anode.

11 . The light emitting display device of claim 1 , further comprising:
a light blocking layer positioned on the encapsulation layer and having a color filter opening; a color filter filling the color filter opening; and a sensing electrode covered by the light blocking layer, wherein the halftone exposure portion overlaps the color filter.

12 . The light emitting display device of claim 11 , wherein
a perimeter of the halftone exposure portion surrounds a perimeter of the anode exposure opening in a plan view of the light emitting display device, and the perimeter of the halftone exposure portion is surrounded by a perimeter of the color filter in the plan view of the light emitting display device.

13 . The light emitting display device of claim 1 , further comprising:
a spacer positioned between the black pixel definition layer and the cathode, wherein the spacer includes a first portion and a second portion shorter than the first portion in a direction perpendicular to the substrate and integrally formed with the first portion.

14 . A method for manufacturing a light emitting display device, the method comprising:
forming a conductive part that overlaps a substrate; forming a conductive layer that overlaps the substrate; forming a first organic layer covering the conductive layer; forming a second organic layer covering the first organic layer; forming an anode on the second organic layer; forming a black pixel definition layer including an anode exposure opening that exposes an exposed portion of the anode; forming a cathode on the black pixel definition layer and the anode; forming an encapsulation layer covering the cathode; forming a first-layer exposure portion and a green-pixel exposure portion in the first organic layer using a mask that includes slits; and forming a second-layer exposure portion in the second organic layer using the mask, wherein the second-layer exposure portion overlaps the first-layer exposure portion, the first-exposure portion overlaps the conductive layer, and the green-pixel exposure portion overlaps the conductive part.

15 . The method of claim 14 , wherein
no exposure portion of the second organic layer is formed using the mask and overlaps the green-pixel exposure portion.

16 . The method of claim 14 , further comprising:
forming a red color filter; forming a green color filter; and forming a blue color filter, wherein the red color filter or the blue filter overlaps the second-layer exposure portion, and the green filter overlaps the green-pixel exposure portion.

17 . The method of claim 14 , wherein
the first organic layer includes a first neighboring portion that neighbors the first-layer exposure portion and does not overlap the conductive layer, the second organic layer includes a second neighboring portion that neighbors the second-layer exposure portion and does not overlap the conductive layer, a face of the first exposure portion is spaced from the substrate by a first distance, a face of the first neighboring portion is spaced from the substrate by a second distance, a face of the second exposure portion is spaced from the substrate by a third distance, a face of the second neighboring portion is spaced from the substrate by a fourth distance, and a difference between the first distance and the second distance or a difference between the third distance and the fourth distance is equal to or less than 30 nm.

18 . The method of claim 14 , wherein
each of the first-layer exposure portion and the second-layer exposure portion overlaps the exposed portion of the anode.

19 . The method of claim 14 , wherein
the first organic layer includes a first opening, the second organic layer includes a second opening, and the first organic layer includes a stepped structure exposed by the second opening.

20 . The method of claim 19 , wherein
an exposure amount for exposing the first organic layer to form the first-layer exposur

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Jun Hee
• Choi Beohm Rock
• Woo Jun Hyuk
• Im Choong Youl
• Cho Seong Min

Classifications

• H10K50/818

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

• H10K50/865

  comprising light absorbing layers, e.g. light-blocking layers · CPC title

• H10K59/80518

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

• H10K59/8792

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

• H10K71/00

  Manufacture or treatment specially adapted for the organic devices covered by this subclass · CPC title