US-12622105-B2 - Display device

US12622105B2US 12622105 B2US12622105 B2US 12622105B2US-12622105-B2

Abstract

A display device comprises a base substrate which is a base substrate having a display area and a non-display area positioned around the display area defined therein, and includes a substrate connection electrode penetrating the base substrate in the thickness direction, an etching stopper which is disposed on a first surface of the base substrate and that covers the substrate connection electrode, and a first pad disposed on a second surface opposite to the first surface of the base substrate and disposed overlapping a substrate through hole, wherein the substrate connection electrode is disposed in the display area, the substrate connection electrode is electrically connected to the etching stopper and the first pad, the etching stopper is electrically connected to the first pad through the substrate connection electrode, and the etching stopper includes a conductive material.

Inventors

Jung Hun NOH
Yi Joon Ahn

Assignees

SAMSUNG DISPLAY CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20200625
Priority Date: 20200309

Claims (19)

1 . A display device comprising: a base substrate in which a display area and a non-display area positioned around the display area are defined and which includes a substrate connection electrode passing through the base substrate in a thickness direction thereof; an etching stopper disposed on a first surface of the base substrate and that covers the substrate connection electrode; a first pad disposed on a second surface opposite to the first surface of the base substrate and disposed to overlap a substrate through-hole; a buffer layer disposed on the etching stopper; an active material layer disposed on the buffer layer; and a light blocking layer disposed to overlap the active material layer, wherein the substrate connection electrode is disposed in the display area and electrically connected to the etching stopper and the first pad, the etching stopper is electrically connected to the first pad through the substrate connection electrode and includes a conductive material, and the light blocking layer is disposed to be coplanar with the etching stopper and spaced apart from the etching stopper.
2 . The display device of claim 1 , further comprising: a first gate insulating layer disposed on the active material layer; a data line disposed on the first gate insulating layer, wherein the data line is electrically connected to the etching stopper through a data connection electrode passing through the first gate insulating layer and the buffer layer in a thickness direction thereof; and a connection line disposed on the second surface of the base substrate, wherein the connection line is electrically connected to the first pad.
3 . The display device of claim 2 , further comprising: a chip-on-film which is disposed on the second surface of the base substrate and on which a driving chip is mounted; and a second pad disposed on the second surface of the base substrate, wherein the second pad is electrically connected to the connection line, and the chip-on-film is electrically connected to the second pad.
4 . The display device of claim 2 , further comprising: a driving chip disposed on the second surface of the base substrate; and a second pad disposed on the second surface of the base substrate, wherein the second pad is electrically connected to the connection line, and the driving chip is disposed to overlap the second pad and electrically connected to the second pad.
5 . The display device of claim 2 , wherein the first surface of the base substrate is in contact with the etching stopper, and the substrate connection electrode is surrounded by an extension of the second surface of the base substrate, an extension of the first surface of the base substrate, and side surfaces of the base substrate.
6 . The display device of claim 5 , wherein a width of the substrate connection electrode decreases in a direction from the extension of the second surface of the base substrate toward the extension of the first surface of the base substrate.
7 . The display device of claim 6 , wherein a slope of a side surface of the substrate connection electrode in contact with the side surface of the base substrate gradually increases in a direction from the extension of the second surface of the base substrate toward the extension of the first surface of the base substrate.
8 . The display device of claim 5 , wherein a width of the substrate connection electrode is constant from the extension of the second surface of the base substrate to the extension of the first surface of the base substrate.
9 . The display device of claim 5 , wherein a roughness of a portion of one surface of the etching stopper in contact with the substrate connection electrode is higher than a roughness of a portion of the one surface of the etching stopper that is not in contact with the substrate connection electrode.
10 . The display device of claim 5 , wherein an etching residue is further disposed on a surface of the etching stopper in contact with the substrate connection electrode, and the etching residue includes the same material as the base substrate.
11 . The display device of claim 2 , wherein the display area includes a plurality of pixels, each of the pixels includes an emission area and a non-emission area positioned around the emission area, an external bank disposed on the data line is disposed in the non-emission area, a light-emitting element is disposed in the emission area, and the emission area is surrounded by the external bank in a plan view.
12 . The display device of claim 11 , wherein the substrate connection electrode is disposed to overlap the emission area.
13 . The display device of claim 11 , wherein the substrate connection electrode is disposed to overlap the external bank of the non-emission area.
14 . The display device of claim 1 , further comprising: a first gate insulating layer disposed on the active material layer; a gate connection electrode disposed on the first gate insulating layer; a first protective layer disposed on the gate connection electrode; and a data line disposed on the first protective layer, wherein the data line is electrically connected to the gate connection electrode through a data connection electrode passing through the first protective layer, and the gate connection electrode is electrically connected to the etching stopper through a gate connection electrode passing through the first gate insulating layer and the buffer layer.
15 . A display device comprising: a base substrate in which a display area and a non-display area positioned around the display area are defined and which includes a substrate through-hole passing through the base substrate in a thickness direction thereof; a buffer layer which is a buffer layer disposed on a first surface of the base substrate and includes a buffer through-hole disposed to overlap the substrate through-hole and passing through the buffer layer in a thickness direction thereof; a data line disposed on the buffer layer; a substrate connection electrode that fills the substrate through-hole and the buffer through-hole, wherein the substrate connection electrode is disposed in the display area and electrically connected to the data line; and a first pad disposed on a second surface opposite to the first surface of the base substrate and disposed to overlap the substrate through-hole, wherein the first pad is electrically connected to the substrate through-hole.
16 . The display device of claim 15 , wherein the first surface of the base substrate is in contact with the buffer layer, the substrate through-hole is surrounded by an extension of the second surface of the base substrate, an extension of the first surface of the base substrate, and side surfaces of the base substrate, the buffer layer includes a first surface in contact with the first surface of the base substrate and a second surface opposite to the first surface of the buffer layer, the buffer through-hole is surrounded by an extension of the first surface of the buffer layer, an extension on the second surface of the buffer layer, and side surfaces of the buffer layer, and an average slope of the side surface of the buffer layer is greater than an average slope of the side surface of the base substrate.
17 . The display device of claim 16 , further comprising a first gate insulating layer disposed directly on the second surface of the buffer layer, wherein a roughness of a surface of the first gate insulating layer in contact with the substrate connection electrode is higher than a roughness of a surface of the first gate insulating layer that is not in contact with the substrate connection electrode.
18 . The display device of claim 16 , further comprising a first gate insulating layer disposed directly on the second surface of the buffer layer, wherein an etching residue is further disposed on a surface of the first gate insulating layer in contact with the substrate connection electrode and includes a same material as a material of the buffer layer.
19 . The display device of claim 16 , wherein the buffer through-hole is disposed to partially overlap a surface of the base substrate in a thickness direction thereof.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application is a national entry of International Application No. PCT/KR2020/008275, filed on Jun. 25, 2020, which claims under 35 U. S.C. § 119(a) and 365(b) priority to and benefits of Korean Patent Application No. 10-2020-0029012, filed on Mar. 9, 2020 in the Korean Intellectual Property Office, the entire contents of which are herein incorporated by reference. BACKGROUND 1. Technical Field The disclosure relates to a display device. 2. Description of the Related Art The importance of display devices has steadily increased with the development of multimedia technology. In response thereto, various types of display devices such as an organic light emitting display (OLED), a liquid crystal display (LCD) and the like have been used. A display device is a device for displaying an image, and may include a display panel, such as an organic light emitting display panel or a liquid crystal display panel. The light emitting display panel may include light emitting elements, e.g., light emitting diodes (LED), and examples of the light emitting diode include an organic light emitting diode (OLED) using an organic material as a fluorescent material and an inorganic light emitting diode using an inorganic material as a fluorescent material. SUMMARY Aspects of the disclosure provide a display device in which a driving circuit unit may be disposed on a rear surface of a base substrate. It should be noted that aspects of the disclosure are not limited thereto and other aspects, which may not be mentioned herein, will be apparent to those of ordinary skill in the art from the following description. According to an embodiment of the disclosure, a display device may include a base substrate in which a display area and a non-display area positioned around the display area may be defined and which includes a substrate connection electrode passing through the base substrate in a thickness direction thereof, an etching stopper disposed on a first surface of the base substrate and that covers a substrate through-hole, and a first pad disposed on a second surface opposite to the first surface of the base substrate and disposed to overlap the substrate through-hole. The substrate connection electrode may be disposed in the display area and electrically connected to the etching stopper and the first pad, and the etching stopper may be electrically connected to the first pad through the substrate connection electrode and includes a conductive material. The display device may further include a buffer layer disposed on the etching stopper, an active material layer disposed on the buffer layer, and a light blocking layer disposed to overlap the active material layer. The light blocking layer may be disposed to be coplanar with the etching stopper and spaced apart from the etching stopper. The display device may further include a first gate insulating layer disposed on the active material layer, a data line disposed on the first gate insulating layer, wherein the data line may be electrically connected to the etching stopper through a data connection electrode passing through the first gate insulating layer and the buffer layer in a thickness direction thereof, and a connection line disposed on the second surface of the base substrate, wherein the connection line may be electrically connected to the first pad. The display device may further include a chip-on-film which may be disposed on the second surface of the base substrate and on which a driving chip may be mounted, and a second pad disposed on the second surface of the base substrate. The second pad may be electrically connected to the connection line, and the chip-on-film may be electrically connected to the second pad. The display device may further include a driving chip disposed on the second surface of the base substrate, and a second pad disposed on the second surface of the base substrate. The second pad may be connected to the connection line, and the driving chip may be disposed to overlap the second pad and connected to the second pad. The first surface of the base substrate may be in contact with the etching stopper, and the substrate connection electrode may be surrounded by an extension of the second surface of the base substrate, an extension of the first surface of the base substrate, and side surfaces of the base substrate. A width of the substrate connection electrode may decrease in a direction from the extension of the second surface of the base substrate toward the extension of the first surface of the base substrate. A slope of a side surface of the substrate connection electrode in contact with the side surface of the base substrate may gradually increase in a direction from the extension of the second surface of the base substrate toward the extension of the first surface of the base substrate. A width of the substrate connection electrode may be constant from the extension of the second surface of the base subs