US-12628528-B2 - Display device and method for manufacturing the same

Abstract

A display device includes: a substrate; a transistor on the substrate; a first electrode connected to the transistor; a first partition wall on the first electrode, and having a pixel opening; an auxiliary electrode on the first partition wall; a second partition wall on the auxiliary electrode; an emission layer in the pixel opening; and a second electrode on the emission layer and the second partition wall, and connected to the auxiliary electrode. An end portion of the auxiliary electrode protrudes from a side surface of at least one of the first partition wall or the second partition wall.

Inventors

• Jun Gi Kim
• Hye Sun Kim
• Sang Hyun YUN
• Gwang Min CHA

Assignees

• SAMSUNG DISPLAY CO., LTD.

Dates

Publication Date

20260512

Application Date

20230316

Priority Date

20220718

Claims (20)

1. 1 . A display device comprising: a substrate; a transistor on the substrate; a first electrode connected to the transistor; a first partition wall on the first electrode, and having a pixel opening; an auxiliary electrode on the first partition wall; a second partition wall on the auxiliary electrode; an emission layer in the pixel opening; and a second electrode on the emission layer and the second partition wall, and connected to the auxiliary electrode, wherein an end portion of the auxiliary electrode protrudes from a side surface of at least one of the first partition wall or the second partition wall, and wherein the second electrode is spaced apart from the side surface of the first partition wall and directly contacts an entirety of at least one side surface of the end portion of the auxiliary electrode.
2. 2 . The display device of claim 1 , wherein a width of the auxiliary electrode is larger than a width of an upper surface of the first partition wall.
3. 3 . The display device of claim 2 , wherein the width of the auxiliary electrode is larger than a width of a lower surface of the second partition wall.
4. 4 . The display device of claim 3 , wherein the second electrode is in contact with the end portion and an opposite end portion of the auxiliary electrode.
5. 5 . The display device of claim 4 , wherein the second electrode covers an upper surface of the emission layer, upper surfaces and side surfaces of opposite ends of the auxiliary electrode, and an upper surface and a side surface of the second partition wall.
6. 6 . The display device of claim 1 , wherein a first one from among the first and second partition walls comprises a hydrophilic material, and a second one from among the first and second partition walls different from the first one comprises a hydrophobic material.
7. 7 . The display device of claim 6 , wherein: the emission layer and the first partition wall comprise the hydrophobic material; and the auxiliary electrode and the second partition wall comprise the hydrophilic material.
8. 8 . The display device of claim 1 , wherein the second partition wall comprises a light blocking material.
9. 9 . The display device of claim 1 , wherein the auxiliary electrode comprises a low reflective metal material, or a transparent conductive oxide.
10. 10 . The display device of claim 9 , wherein the auxiliary electrode comprises at least one of titanium, titanium oxide, titanium nitride, aluminum, aluminum nitride, molybdenum, molybdenum oxide, gallium zinc oxide, indium tin oxide, or zinc indium oxide.
11. 11 . A display device comprising: a substrate; a transistor on the substrate; a first electrode connected to the transistor; a first partition wall on the first electrode, and having a pixel opening; an auxiliary electrode on the first partition wall; a second partition wall on the auxiliary electrode; an emission layer in the pixel opening; and a second electrode on the emission layer and the second partition wall, and connected to the auxiliary electrode, wherein an end portion of the auxiliary electrode protrudes from a side surface of at least one of the first partition wall or the second partition wall, and wherein the end portion of the auxiliary electrode has a curved shape extending toward the substrate.
12. 12 . The display device of claim 11 , wherein an inclination angle of the end portion of the auxiliary electrode is the same as that of the side surface of the first partition wall.
13. 13 . The display device of claim 11 , wherein the end portion of the auxiliary electrode is spaced from the side surface of the first partition wall.
14. 14 . A manufacturing method of a display device, comprising: forming a transistor on a substrate; forming a first electrode connected to the transistor; forming a first partition wall, an auxiliary electrode, and a second partition wall overlapping with each other on the first electrode; forming an emission layer on the first electrode; and forming a second electrode on the emission layer and the second partition wall to be connected to the auxiliary electrode, wherein an end portion of the auxiliary electrode protrudes from a side surface of at least one of the first partition wall or the second partition wall, and wherein the second electrode is spaced apart from the side surface of the first partition wall and directly contacts an entirety of at least one side surface of the end portion of the auxiliary electrode.
15. 15 . The manufacturing method of claim 14 , further comprising performing an ashing process after the forming of the first partition wall, the auxiliary electrode, and the second partition wall, wherein widths of the first and second partition walls are reduced by the ashing process.
16. 16 . The manufacturing method of claim 14 , wherein the forming of the first partition wall, the auxiliary electrode, and the second partition wall comprises: sequentially stacking a first insulating material layer, a conductive material layer, and a second insulating material layer on the first electrode; and patterning the first insulating material layer, the conductive material layer, and the second insulating material layer to form the first partition wall, the auxiliary electrode, and the second partition wall, wherein the auxiliary electrode is located between the first partition wall and the second partition wall, and wherein the auxiliary electrode has a rod shape extending in a direction parallel to an upper surface of the substrate in a cross-sectional view.
17. 17 . The manufacturing method of claim 14 , wherein the forming of the first partition wall, the auxiliary electrode, and the second partition wall comprises: forming a first insulating material layer on the first electrode, and patterning the first insulating material layer to form the first partition wall; sequentially stacking a conductive material layer and a second insulating material layer on the first partition wall; and patterning the conductive material layer and the second insulating material layer to form the auxiliary electrode and the second partition wall, wherein the auxiliary electrode is located between the first partition wall and the second partition wall, and wherein the end portion of the auxiliary electrode has a curved shape extending toward the substrate in a cross-sectional view.
18. 18 . The manufacturing method of claim 14 , wherein the second electrode covers an upper surface of the emission layer, upper surfaces and side surfaces of opposite ends of the auxiliary electrode, and an upper surface and a side surface of the second partition wall.
19. 19 . The manufacturing method of claim 14 , wherein a first one from among the first and second partition walls comprises a hydrophilic material, and a second one from among the first and second partition walls different from the first one comprises a hydrophobic material.
20. 20 . The manufacturing method of claim 14 , wherein the auxiliary electrode comprises a low reflective metal material, or a transparent conductive oxide.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority to and the benefit of Korean Patent Application No. 10-2022-0088277, filed in the Korean Intellectual Property Office on Jul. 18, 2022, the entire content of which is incorporated by reference herein. BACKGROUND 1. Field Embodiments of the present disclosure relate to a display device, and a manufacturing method of the display device. 2. Description of the Related Art A display device serves to display a screen, and includes a liquid crystal display, an organic light emitting diode display, and the like. The display device is used in various suitable electronic devices, such as mobile phones, navigation units, digital cameras, electronic books, portable game machines, and various terminals. The organic light emitting diode display has a self-luminance characteristic, and unlike the liquid crystal display device, because the organic light emitting diode display does not require a separate light source, a thickness and weight thereof may be reduced. In addition, the organic light emitting diode device has high-quality characteristics, such as low power consumption, high luminance, and high response speeds. Each pixel of the organic light emitting diode display may be divided by a pixel defining layer, and an emission layer may be formed in an opening of the pixel defining layer by using an inkjet printing process or the like. In this case, defects may occur, such as overflow or lack of ink. The above information disclosed in this Background section is for enhancement of understanding of the background of the present disclosure, and therefore, it may contain information that does not constitute prior art. SUMMARY Embodiments of the present disclosure are directed to a display device, and a manufacturing method of the display device, in which an emission layer is stably formed. Embodiments of the present disclosure are directed to a display device capable of preventing or substantially preventing external light from being reflected and visually recognized, and in which resistance of an electrode is reduced, and a manufacturing method of the display device. According to one or more embodiments of the present disclosure, a display device includes: a substrate; a transistor on the substrate; a first electrode connected to the transistor; a first partition wall on the first electrode, and having a pixel opening; an auxiliary electrode on the first partition wall; a second partition wall on the auxiliary electrode; an emission layer in the pixel opening; and a second electrode on the emission layer and the second partition wall, and connected to the auxiliary electrode. An end portion of the auxiliary electrode protrudes from a side surface of at least one of the first partition wall or the second partition wall. In an embodiment, a width of the auxiliary electrode may be larger than a width of an upper surface of the first partition wall. In an embodiment, the width of the auxiliary electrode may be larger than a width of a lower surface of the second partition wall. In an embodiment, the second electrode may be in contact with the end portion and an opposite end portion of the auxiliary electrode. In an embodiment, the second electrode may cover an upper surface of the emission layer, upper surfaces and side surfaces of opposite ends of the auxiliary electrode, and an upper surface and a side surface of the second partition wall. In an embodiment, the end portion of the auxiliary electrode may have a curved shape extending toward the substrate. In an embodiment, an inclination angle of the end portion of the auxiliary electrode may be the same as that of the side surface of the first partition wall. In an embodiment, the end portion of the auxiliary electrode may be spaced from the side surface of the first partition wall. In an embodiment, a first one from among the first and second partition walls may include a hydrophilic material, and a second one from among the first and second partition walls different from the first one may include a hydrophobic material. In an embodiment, the emission layer and the first partition wall may include the hydrophobic material; and the auxiliary electrode and the second partition wall may include the hydrophilic material. In an embodiment, the second partition wall may include a light blocking material. In an embodiment, the auxiliary electrode may include a low reflective metal material, or a transparent conductive oxide. In an embodiment, the auxiliary electrode may include at least one of titanium, titanium oxide, titanium nitride, aluminum, aluminum nitride, molybdenum, molybdenum oxide, gallium zinc oxide, indium tin oxide, or zinc indium oxide. According to one or more embodiments of the present disclosure, a manufacturing method of a display device, includes: forming a transistor on a substrate; forming a first electrode connected to the transistor; forming a first partition wall, an auxiliary electr