US-12628506-B2 - Display device

US12628506B2US 12628506 B2US12628506 B2US 12628506B2US-12628506-B2

Abstract

A display device includes a substrate, a display area located over the substrate and including a plurality of pixels, a non-display area arranged outside the display area, a first power voltage line corresponding to one side of the display area in the non-display area and including a first conductive layer and a second conductive layer arranged over the first conductive layer, a second power voltage line spaced apart from the first power voltage line in the non-display area, a first dam unit surrounding the display area and overlapping the second power voltage line in a plan view, a second dam unit arranged outside the first dam unit, and a third dam unit arranged between the display area and the first dam unit and overlapping the first conductive layer and the second conductive layer of the first power voltage line in the plan view.

Inventors

WonSuk Choi
Seongryong Lee
Yonghwan Park
Nayun Kwak
Hwajeong Kim
Eunae JUNG

Assignees

SAMSUNG DISPLAY CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20210707
Priority Date: 20180906

Claims (20)

1 . A display device comprising: a substrate; a display area located over the substrate and which includes a plurality of pixels, each of the pixels including a first electrode, an emission layer arranged on the first electrode, and a second electrode arranged on the emission layer; a non-display area arranged outside the display area; a plurality of terminals arranged in the non-display area and arranged along an edge of the substrate, a first power voltage line arranged in the non-display area and connected to at least one of the plurality of terminals; a first dam unit which surrounds the display area and overlaps the first power voltage line in a plan view; a second dam unit arranged between the first dam unit and the plurality of terminals; and a third dam unit arranged between the display area and the first dam unit and which overlaps the first power voltage line in the non-display area only in the plan view, wherein the second electrode is arranged in common in the plurality of pixels and an edge of the second electrode overlaps the third dam unit.
2 . The display device of claim 1 , wherein the first power voltage line includes a first conductive layer and a second conductive layer arranged on the first conductive layer.
3 . The display device of claim 2 , wherein an insulating layer is arranged between the first conductive layer and the second conductive layer, and the first conductive layer is electrically connected with the second conductive layer through a contact hole defined by the insulating layer.
4 . The display device of claim 1 , wherein further comprising a second power voltage line spaced apart from the first power voltage line in the non-display area.
5 . The display device of claim 4 , wherein the second power voltage line includes a third conductive layer and a fourth conductive layer arranged on the third conductive layer.
6 . The display device of claim 5 , wherein an insulating layer is arranged between the third conductive layer and the fourth conductive layer, and the third conductive layer is electrically connected with the fourth conductive layer through a contact hole defined by the insulating layer.
7 . The display device of claim 5 , wherein the first dam unit or the second dam unit clads an end of the fourth conductive layer.
8 . The display device of claim 1 , further comprising: a first planarization layer arranged in the display area and the non-display area; a second planarization layer arranged over the first planarization layer; and a pixel-defining layer arranged over the second planarization layer, wherein the first dam unit includes at least one of the pixel-defining layer and the second planarization layer.
9 . The display device of claim 1 , further comprising: a first planarization layer arranged in the display area and the non-display area; a second planarization layer arranged over the first planarization layer; and a pixel-defining layer arranged over the second planarization layer, wherein the second dam unit includes at least one of the pixel-defining layer and the second planarization layer.
10 . The display device of claim 1 , further comprising: a first planarization layer arranged in the display area and the non-display area; a second planarization layer arranged over the first planarization layer; and a pixel-defining layer arranged over the second planarization layer, wherein the third dam unit include at least one of the pixel-defining layer and the second planarization layer.
11 . The display device of claim 1 , wherein a height of the second dam unit is greater than a height of the first dam unit.
12 . The display device of claim 1 , further comprising a thin-film encapsulation layer which includes a first inorganic encapsulation layer that covers the display area, an organic encapsulation layer on the first inorganic encapsulation layer, and a second inorganic encapsulation layer on the organic encapsulation layer.
13 . The display device of claim 12 , wherein the thin-film encapsulation layer covers the third dam unit.
14 . The display device of claim 12 , wherein the first inorganic encapsulation layer directly contacts the second inorganic encapsulation layer at the outside of the second dam unit.
15 . The display device of claim 1 , wherein the distance between the first dam unit and the second dam unit is smaller than the distance between the first dam unit and the third dam unit.
16 . A display device comprising: a substrate; a display area located over the substrate and which includes a plurality of pixels; a non-display area arranged outside the display area; a plurality of terminals aged in the non-display area and arranged along an edge of the substrate; a first power voltage line arranged in the non-display area and which is connected to at least one of the plurality of terminals and includes a first conductive layer and a second conductive layer arranged over the first conductive layer; a second power voltage line spaced apart from the first power voltage line in the non-display area and which includes a third conductive layer and a fourth conductive layer arranged on the third conductive layer; a first dam unit which surrounds the display area and overlaps the first power voltage line in a plan view; a second dam unit arranged between the first dam unit and the plurality of terminals; and a third dam unit arranged between the display area and the first dam unit and which overlaps the first power voltage line in the non-display area only in the plan view, wherein the third conductive layer includes a same material as the first conductive layer, and the fourth conductive layer includes a same material as the second conductive layer.
17 . The display device of claim 16 , further comprising an insulating layer arranged between the first conductive layer and the second conductive layer and between the third conductive layer and the fourth conductive layer, wherein: the first conductive layer is electrically connected with the second conductive layer through a first contact hole defined by the insulating layer, and the third conductive layer is electrically connected with the fourth conductive layer through a second contact hole defined by the insulating layer.
18 . The display device of claim 16 , further comprising: a thin-film encapsulation layer which includes a first inorganic encapsulation layer covering the display area and the third dam unit, an organic encapsulation layer on the first inorganic encapsulation layer, and a second inorganic encapsulation layer on the organic encapsulation layer.
19 . The display device of claim 18 , wherein the first inorganic encapsulation layer directly contacts the second inorganic encapsulation layer at the outside of the second dam unit.
20 . The display device of claim 16 , wherein each of the pixels includes a first electrode, an emission layer arranged on the first electrode, and a second electrode arranged on the emission layer, and the second electrode is arranged in common in the plurality of pixels and an edge of the second electrode overlaps the third dam unit.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is a continuation of U.S. patent application Ser. No. 16/522,827, filed on Jul. 26, 2019, which claims priority to Korean Patent Application No. 10-2018-0106749, filed on Sep. 6, 2018, and all the benefits accruing therefrom under 35 U.S.C. § 119, the content of which in its entirety is herein incorporated by reference. BACKGROUND 1. Field One or more exemplary embodiments relate to a display device, and more particularly, to a display device that implements high quality while reducing an area of a dead space of the display device. 2. Description of the Related Art A display device is a device that visually displays data. Recently, the purposes of a display device have become more diversified. Also, as a display device is thin and lightweight, a range of use thereof has gradually been extended. The display device includes a substrate divided into a display area and a non-display area outside the display area. The non-display area in which non-display elements such as a pad unit, a plurality of wirings, and a driving circuit unit are arranged is a dead space which does not implement an image. Recently, the demand for reducing the dead space of a display device has increased. SUMMARY One or more exemplary embodiments include a display device and a manufacturing method thereof that reduce a dead space and provide a high-quality image. However, it should be understood that exemplary embodiments described herein should be considered in a descriptive sense only and not for limitation of the disclosure. Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented exemplary embodiments. According to one or more exemplary embodiments, a display device includes a substrate; a display area located over the substrate and which includes a plurality of pixels, a non-display area arranged outside the display area, a first power voltage line which corresponds to one side of the display area in the non-display area and includes a first conductive layer and a second conductive layer arranged over the first conductive layer, a second power voltage line spaced apart from the first power voltage line in the non-display area, a first dam unit which surrounds the display area and overlaps the second power voltage line in a plan view, a second dam unit arranged outside the first dam unit, and a third dam unit arranged between the display area and the first dam unit and which overlaps the first conductive layer and the second conductive layer of the first power voltage line in a plan view. In an exemplary embodiment, the display device may further include a first planarization layer arranged in the display area and the non-display area, a second planarization layer arranged over the first planarization layer, and a pixel-defining layer arranged over the second planarization layer, where the third dam unit may include at least one of the pixel-defining layer and the second planarization layer. In an exemplary embodiment, a step difference may be provided in a top surface of an upper layer among the pixel-defining layer and the second planarization layer. In an exemplary embodiment, a bottom layer among the pixel-defining layer and the second planarization layer may clad an end of the second conductive layer. In an exemplary embodiment, the upper layer among the pixel-defining layer and the second planarization layer may clad an end of the bottom layer. In an exemplary embodiment, each of the pixels may include a first electrode, an emission layer arranged on the first electrode, and a second electrode arranged on the emission layer, and the second electrode may be arranged in common in the plurality of pixels and may extend to the non-display area to cover a portion of the third dam unit. In an exemplary embodiment, the display device may further include a thin-film encapsulation layer which includes a first inorganic encapsulation layer that covers the display area, an organic encapsulation layer on the first inorganic encapsulation layer, and a second inorganic encapsulation layer on the organic encapsulation layer, and the thin-film encapsulation layer may cover the third dam unit. In an exemplary embodiment, the first inorganic encapsulation layer may directly contact the second inorganic encapsulation layer at the outside of the second dam unit. In an exemplary embodiment, a width of the second conductive layer may be less than a width of the first conductive layer. In an exemplary embodiment, the second conductive layer may be provided in plural and the second conductive layers may be spaced apart from each other over the first conductive layer, and the third dam unit may clad, with an insulating layer, each of the plurality of second conductive layers spaced apart from each other to constitute a plurality of sub-dam units. In an exemplary embodiment, an in