US-20260130076-A1 - DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF

Abstract

A display device according to some embodiments includes: a substrate; a plurality of common voltage lines positioned on the substrate; a plurality of connection electrodes positioned on a plurality of common voltage lines; an emission layer positioned on the connection electrode; and a common electrode positioned on the emission layer, wherein the emission layer has a plurality of first openings positioned on at least a portion of a plurality of connection electrodes, the common electrode is electrically connected to the connection electrode through a plurality of first openings, and a pitch of a first direction of a plurality of first openings has a range of about 0.1 mm to about 2.5 mm.

Inventors

• Se Ho LEE
• Jang Kyu Kim
• Tae Hyung Kim
• Yong Dae Lee
• Ho-Jun Lee

Assignees

• SAMSUNG DISPLAY CO., LTD.

Dates

Publication Date

20260507

Application Date

20251222

Priority Date

20211022

Claims (20)

1. 1 . A display device comprising: a substrate; common voltage lines on the substrate; connection electrodes on the common voltage lines; an emission layer on the connection electrode, and defining openings on at least a portion of the connection electrodes; and a common electrode on the emission layer, and electrically connected to the connection electrode through the openings, wherein in a plan view, the openings include a first opening, a second opening, and a third opening that are disposed consecutively in a row along a first direction, and a first distance between the first opening and the second opening is different from a second distance between the second opening and the third opening.
2. 2 . The display device of claim 1 , wherein in a plan view, the openings include a fourth opening, a fifth opening, and a sixth opening that are disposed consecutively in a column along a second direction crossing the first direction, and a third distance between the fourth opening and the fifth opening is different from a fourth distance between the fifth opening and the sixth opening.
3. 3 . The display device of claim 1 , further comprising pixels, the pixels comprising sub-pixels corresponding to different colors and comprising a transistor and a light emitting diode, the light emitting diode comprising a pixel electrode, the emission layer, and the common electrode.
4. 4 . The display device of claim 3 , wherein a pitch of the first opening and the second opening in the first direction is greater than a pitch of the pixels in the first direction.
5. 5 . The display device of claim 4 , wherein the pitch of the first opening and the second opening in the first direction is greater than a pitch of the common voltage lines in the first direction.
6. 6 . The display device of claim 4 , wherein the pitch of the first opening and the second opening in the first direction is greater than a pitch of the connection electrodes in the first direction.
7. 7 . The display device of claim 3 , wherein the connection electrodes are at a same conductive layer as, and comprise a same material as, the pixel electrode.
8. 8 . The display device of claim 3 , further comprising an insulating layer between the pixel electrode and the emission layer, and defining an insulating layer opening overlapping one of the openings.
9. 9 . The display device of claim 8 , wherein the one of the openings is within an edge of the insulating layer opening in the plan view.
10. 10 . The display device of claim 8 , wherein an edge of the one of the openings and an edge of the insulating layer opening are aligned with each other.
11. 11 . The display device of claim 1 , wherein a pitch of the first opening and the second opening in the first direction has a range of 0.1 mm to 2.5 mm.
12. 12 . A display device comprising: a substrate; common voltage lines on the substrate; connection electrodes on the common voltage lines; an emission layer on the connection electrode, and defining first openings on at least a portion of the connection electrodes; and a common electrode on the emission layer, and electrically connected to the connection electrode through the first openings, wherein a pitch of the first openings in a first direction is greater than a pitch of the common voltage lines in the first direction.
13. 13 . The display device of claim 12 , further comprising pixels, the pixels comprising sub-pixels corresponding to different colors and comprising a transistor and a light emitting diode, the light emitting diode comprising a pixel electrode, the emission layer, and the common electrode.
14. 14 . The display device of claim 13 , wherein the pitch of the first openings in the first direction is greater than a pitch of the pixels in the first direction.
15. 15 . The display device of claim 14 , wherein the pitch of the first openings in the first direction is greater than a pitch of the connection electrodes in the first direction.
16. 16 . The display device of claim 13 , wherein the connection electrodes are at a same conductive layer as, and comprise a same material as, the pixel electrode.
17. 17 . The display device of claim 13 , further comprising an insulating layer between the pixel electrode and the emission layer, and defining a second opening overlapping one of the first openings.
18. 18 . The display device of claim 17 , wherein the one of the first openings is within an edge of the second opening in a plan view.
19. 19 . The display device of claim 17 , wherein an edge of the one of the first openings and an edge of the second opening are aligned with each other.
20. 20 . The display device of claim 17 , wherein the pitch of the first openings in the first direction has a range of 0.1 mm to 2.5 mm.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of U.S. patent application Ser. No. 17/886,349, filed Aug. 11, 2022, which claims priority to, and the benefit of, Korean Patent Application No. 10-2021-0141673 filed in the Korean Intellectual Property Office on Oct. 22, 2021, the entire content of both of which is incorporated herein by reference. BACKGROUND 1. Field The present disclosure relates to a display device, and to a manufacturing method thereof. 2. Description of the Related Art A display device includes a display area including a plurality of pixels. Each pixel includes a pixel electrode to which a data signal is applied, a plurality of transistors and at least one capacitor for transmitting a data signal to the pixel electrode, and a common electrode facing the pixel electrode. At least one layer may be positioned between the pixel electrode and the common electrode. The common electrode may be formed as one electrode over a plurality of pixels to transmit a constant voltage. The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure, and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art. SUMMARY The common electrode formed over a plurality of pixels may be electrically connected to an underlying connection electrode through an opening formed in a layer positioned thereunder. Embodiments of the present disclosure may reduce contamination due to particles generated when forming the opening where the common electrode is connected to the underlying connection electrode to shorten a manufacturing process time, and may improve uniformity of luminance of the display area to such an extent that a mura is either less visible or not visible. A display device according to some embodiments includes a substrate common voltage lines on the substrate, connection electrodes on common voltage lines, an emission layer on the connection electrode, and defining first openings on at least a portion of the connection electrode, a pitch of a first direction of the first openings having a range of about 0.1 mm to about 2.5 mm, and a common electrode on the emission layer, and electrically connected to the connection electrode through first openings. The display device may further include pixels, the pixels including sub-pixels corresponding to different colors and including a transistor and a light emitting diode (LED), the light emitting diode (LED) including a pixel electrode, the emission layer, and the common electrode. The pitch of the first openings in the first direction may be greater than a pitch of the pixels in the first direction. The pitch of the first openings in the first direction may be greater than a pitch of the common voltage lines in the first direction. The pitch of the first openings in the first direction may be greater than a pitch of the connection electrodes in the first direction. The connection electrodes may be at a same conductive layer as, and may include a same material as, the pixel electrode. The display device may further include an insulating layer between the pixel electrode and the emission layer, and defining a second opening overlapping one of the first openings. The one of the first openings may be within an edge of the second opening in a plan view. An edge of the one of the first openings and an edge of the second opening may be aligned with each other. A pitch of the first openings in a second direction, which is substantially perpendicular to the first direction, may have a range of about 0.1 mm to about 2.5 mm. A display device according to some embodiments includes a substrate common voltage lines on the substrate, connection electrodes on common voltage lines, an emission layer on the connection electrodes, defining first openings on at least a portion of connection electrodes, and having an opening formation region defining the first openings and an opening non-formation region not including the first openings, the opening formation region and the opening non-formation region being alternately arranged in a first direction, and a common electrode on the emission layer, and electrically connected to the connection electrodes through the first openings. The first openings may be arranged in the opening formation region with a constant pitch in a first direction, the pitch being in a range of about 0.1 mm to about 2.5 mm. A width of the opening non-formation region between the opening formation region and an adjacent opening formation region in the first direction may be greater than a pitch of the first openings, and equal to or less than a value equal to twice the pitch of the first openings added to a width of the opening formation region in the first direction. A width of the opening formation region in the first direction may be equal to a width of the opening