US-12628475-B2 - Display device and method of manufacturing the same

Abstract

A display device including a substrate, a first electrode and a second electrode on the substrate, extending parallel to each other along a first direction, and spaced from each other in a second direction intersecting the first direction, a plurality of light emitting elements on the first electrode and the second electrode, a first insulating layer partially covering upper surfaces of the light emitting elements, a first connection electrode on the plurality of light emitting elements and the first insulating layer, the first connection electrode being in contact with an end of each of the plurality of light emitting elements, a second insulating layer on the first connection electrode, a second connection electrode on the second insulating layer, the second connection electrode being in contact with an other end of each of the plurality of light emitting elements, and a first dummy electrode overlapping the first connection electrode.

Inventors

• Veidhes BASRUR
• Ki Nyeng KANG
• Ock Soo Son
• Jong Hwan CHA

Assignees

• SAMSUNG DISPLAY CO., LTD.

Dates

Publication Date

20260512

Application Date

20230622

Priority Date

20220728

Claims (20)

1. 1 . A display device comprising: a substrate; a first electrode and a second electrode on the substrate, extending parallel to each other along a first direction, and spaced from each other in a second direction intersecting the first direction; a plurality of light emitting elements on the first electrode and the second electrode; a first insulating layer partially covering upper surfaces of the plurality of light emitting elements; a first connection electrode on the plurality of light emitting elements and the first insulating layer, the first connection electrode being in contact with an end of each of the plurality of light emitting elements; a second insulating layer on the first connection electrode; a second connection electrode on the second insulating layer, the second connection electrode being in contact with an other end of each of the plurality of light emitting elements; and a first dummy electrode overlapping the first connection electrode in a thickness direction of the substrate.
2. 2 . The display device of claim 1 , wherein the first dummy electrode is at a same layer as the second connection electrode and comprises a same material as the second connection electrode.
3. 3 . The display device of claim 2 , wherein the second insulating layer comprises a first insulating hole partially exposing an upper surface of the first connection electrode, and the first dummy electrode is in direct contact with the upper surface of the first connection electrode through the first insulating hole.
4. 4 . The display device of claim 3 , wherein the first dummy electrode is electrically insulated from the second connection electrode.
5. 5 . The display device of claim 4 , wherein the first dummy electrode overlaps the plurality of light emitting elements in the thickness direction of the substrate.
6. 6 . The display device of claim 4 , wherein the first dummy electrode is located at an end of the first connection electrode on a first side in the first direction.
7. 7 . The display device of claim 1 , wherein the first connection electrode overlaps the first electrode in the thickness direction of the substrate, and the second connection electrode overlaps the second electrode in the thickness direction of the substrate.
8. 8 . The display device of claim 3 , wherein the second connection electrode extends toward a second side in the first direction.
9. 9 . The display device of claim 8 , further comprising a third connection electrode at a same layer as the first connection electrode and spaced, in the second direction, from a portion of the second connection electrode that extends toward the second side in the first direction.
10. 10 . The display device of claim 9 , wherein the portion of the second connection electrode that extends toward the second side in the first direction and the third connection electrode is in contact with the ends of the plurality of light emitting elements.
11. 11 . The display device of claim 10 , further comprising a second dummy electrode overlapping, in the thickness direction of the substrate, the portion of the second connection electrode that extends toward the second side in the first direction.
12. 12 . The display device of claim 11 , wherein the second dummy electrode is at the same layer as the first connection electrode, and the second dummy electrode comprises a same material as the first connection electrode.
13. 13 . The display device of claim 12 , wherein the second dummy electrode is between the first connection electrode and the third connection electrode in a plan view.
14. 14 . A method of manufacturing a display device, the method comprising: forming a first electrode and a second electrode on a substrate, the first electrode and the second electrode extending parallel to each other along a first direction and spaced from each other in a second direction intersecting the first direction; forming a plurality of light emitting elements on the first electrode and the second electrode; forming a first insulating layer partially covering upper surfaces of the plurality of light emitting elements; forming a first connection electrode on the plurality of light emitting elements and the first insulating layer, the first connection electrode contacting an end of each of the plurality of light emitting elements; forming a second insulating layer on the first connection electrode; and forming a second connection electrode on the second insulating layer, the second connection electrode contacting an other end of each of the plurality of light emitting elements, wherein in the forming of the second connection electrode, a first dummy electrode overlapping the first connection electrode in a thickness direction of the substrate is also formed.
15. 15 . The method of claim 14 , wherein the first dummy electrode is at a same layer as the second connection electrode and comprises a same material as the second connection electrode.
16. 16 . The method of claim 15 , wherein in the forming of the second insulating layer, the second insulating layer comprises a first insulating hole partially exposing an upper surface of the first connection electrode, and the first dummy electrode is in direct contact with the upper surface of the first connection electrode through the first insulating hole.
17. 17 . The method of claim 16 , wherein the second connection electrode extends toward a second side in the first direction in the forming of the second connection electrode, and a third connection electrode at a same layer as the first connection electrode and spaced, in the second direction, from a portion of the second connection electrode that extends toward the second side in the first direction is formed in the forming of the first connection electrode.
18. 18 . The method of claim 17 , wherein the portion of the second connection electrode that extends toward the second side in the first direction and the third connection electrode is in contact with the ends of the plurality of light emitting elements.
19. 19 . The method of claim 18 , wherein in the forming of the first connection electrode, a second dummy electrode overlapping, in the thickness direction of the substrate, the portion of the second connection electrode that extends toward the second side in the first direction and located at a same layer as the first connection electrode is formed.
20. 20 . The method of claim 19 , wherein the second dummy electrode is formed between the first connection electrode and the third connection electrode in a plan view.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority to and the benefit of Korean Patent Application No. 10-2022-0093756, filed on Jul. 28, 2022, in the Korean Intellectual Property Office (KIPO), the entire content of which is incorporated by reference herein. BACKGROUND 1. Field One or more embodiments of the present disclosure relate to a display device and a method of manufacturing the same. 2. Description of the Related Art Display devices are becoming increasingly important with the development of multimedia. Accordingly, various types of display devices such as organic light emitting displays (OLEDs) and liquid crystal displays (LCDs) are being used. As a device for displaying an image of a display device, there is a self-luminous display device including a light emitting element. The self-luminous display device may be an organic light emitting display using an organic material as a light emitting material in a light emitting element or an inorganic light emitting display using an inorganic material as a light emitting material in a light emitting element. SUMMARY Aspects and features of embodiments of the present disclosure provide a display device with reduced visibility of dark spots due to breakage of connection electrodes. Aspects and features of embodiments of the present disclosure provide a method of manufacturing a display device with reduced visibility of dark spots due to breakage of connection electrodes. However, embodiments of the present disclosure are not limited to those set forth herein. The above and other embodiments of the present disclosure will become more apparent to one of ordinary skill in the art to which the present disclosure pertains by referencing the detailed description of the present disclosure given below. According to one or more embodiments of the present disclosure, there is provided a display device including a substrate, a first electrode and a second electrode on the substrate, extending parallel to each other along a first direction, and spaced from each other in a second direction intersecting the first direction, a plurality of light emitting elements on the first electrode and the second electrode, a first insulating layer partially covering upper surfaces of the plurality of light emitting elements, a first connection electrode on the plurality of light emitting elements and the first insulating layer, the first connection electrode being in contact with an end of each of the plurality of light emitting elements, a second insulating layer on the first connection electrode, a second connection electrode on the second insulating layer, and the second connection electrode being in contact with an other end of each of the plurality of light emitting elements, and a first dummy electrode overlapping the first connection electrode in a thickness direction of the substrate. The first dummy electrode may be at a the same layer as the second connection electrode and may include a same material as the second connection electrode. The second insulating layer may include a first insulating hole partially exposing an upper surface of the first connection electrode, and the first dummy electrode may be in direct contact with the upper surface of the first connection electrode through the first insulating hole. The first dummy electrode may be electrically insulated from the second connection electrode. The first dummy electrode may overlap the plurality of light emitting elements in the thickness direction of the substrate. The first dummy electrode may be located at an end of the first connection electrode on a first side in the first direction. The first connection electrode may overlap the first electrode in the thickness direction of the substrate, and the second connection electrode may overlap the second electrode in the thickness direction of the substrate. The second connection electrode may extend toward a second side in the first direction. The display device may further include a third connection electrode at a same layer as the first connection electrode and spaced, in the second direction, from a portion of the second connection electrode that extends toward the second side in the first direction. The portion of the second connection electrode that extends toward the second side in the first direction and the third connection electrode may be in contact with the ends of the plurality of light emitting elements. The display device may further include a second dummy electrode overlapping, in the thickness direction of the substrate, the portion of the second connection electrode that extends toward the second side in the first direction. The second dummy electrode may be at the same layer as the first connection electrode, and the second dummy electrode may include a same material as the first connection electrode. The second dummy electrode may be between the first connection electrode and the third connection electrode in a plan view. A