US-12620338-B2 - Display device

US12620338B2US 12620338 B2US12620338 B2US 12620338B2US-12620338-B2

Abstract

Provided is a display device. The display device comprises a first substrate which includes an active area with a plurality of sub-pixels and a non-active area enclosing the active area and is made of one of transparent conductive oxides or oxide semiconductors, a plurality of signal lines disposed on the first substrate, a pad part disposed on the first substrate in the non-active area, a plurality of link lines which connects the pad part and the plurality of signal lines, a plurality of inorganic insulating layers disposed between the first substrate and the plurality of link lines; and a second substrate disposed on the first substrate and the plurality of link lines, wherein a plurality of first link lines among the plurality of link lines includes a first line pattern connected to the plurality of signal lines, a second line pattern connected to the pad part; and a third line pattern which connects the first line pattern and the second line pattern of the first link line and overlaps a tip end of the second substrate, and the plurality of inorganic insulating layers is disposed except an area where the tip end of the second substrate overlaps the third line pattern of the first link line to improve moisture blocking performance, and suppress the occurrence of cracks in an outer peripheral portion.

Inventors

Hoiyong Kwon

Assignees

LG DISPLAY CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20230817
Priority Date: 20220818

Claims (20)

1 . A display device, comprising: a first substrate which includes an active area having a plurality of sub-pixels and a non-active area; a plurality of signal lines disposed on the first substrate in the active area; a pad part disposed on the first substrate in the non-active area; a plurality of link lines which connects the pad part and the plurality of signal lines and each extends to the non-active area; a plurality of inorganic insulating layers disposed between the first substrate and the plurality of link lines and overlapping the plurality of link lines on the first substrate; a second substrate disposed on the first substrate and the plurality of link lines; and a filling layer disposed on the first substrate, wherein a plurality of first link lines among the plurality of link lines each includes: a first line pattern connected to the plurality of signal lines and adjacent to the active area; a second line pattern connected to the pad part and spaced apart from the first line pattern and disposed close to an outer periphery of the first substrate; and a third line pattern which connects the first line pattern and the second line pattern and overlaps a tip end of the second substrate, and wherein each layer in the plurality of inorganic insulating layers is offset from an area where the tip end of the second substrate overlaps the third line pattern of the first link line, wherein the first substrate includes one or more of a transparent conductive oxide or an oxide semiconductor, wherein the filling layer is disposed in an area overlapping a tip end of the second substrate, wherein the plurality of inorganic insulating layers includes a first passivation layer disposed on the first line pattern and the second line pattern of the first link line, and wherein the third line pattern of the first link line is disposed on the first passivation layer and connects the first line pattern and the second line pattern of the first link line each through a contact hole in the first passivation layer.
2 . The display device according to claim 1 , wherein the first line pattern and the second line pattern are disposed on a same layer as at least one of the plurality of signal lines, and the third line pattern of the first link line is disposed on the first line pattern and the second line pattern.
3 . The display device according to claim 1 , wherein the filling layer disposed between the third line pattern and the first substrate.
4 . The display device according to claim 3 , wherein the filling layer includes an organic insulating material.
5 . The display device according to claim 3 , further comprising: a color filter disposed in the active area, wherein the filling layer includes a same material as the color filter.
6 . The display device according to claim 3 , wherein the first passivation layer is in contact with a side surface of the filling layer.
7 . The display device according to claim 1 , wherein the plurality of first link lines are each connected to a pad electrode located at a tip end of the pad part.
8 . The display device according to claim 7 , wherein each of the plurality of first link lines is connected to one of the plurality of signal lines that are configured to receive a constant voltage, or is connected to one of dummy lines.
9 . The display device according to claim 7 , wherein the plurality of link lines includes a plurality of second link lines disposed between the plurality of first link lines.
10 . The display device according to claim 9 , wherein the plurality of inorganic insulating layers is disposed in all of areas where the plurality of second link lines are disposed.
11 . The display device according to claim 9 , wherein the plurality of second link lines each has a smaller width than each of the plurality of first link lines.
12 . The display device according to claim 9 , wherein the plurality of second link lines each includes: a first line pattern connected to the plurality of signal lines; a second line pattern connected to the pad part; and a third line pattern that connects the first line pattern and the second line pattern of the second link line and overlaps the tip end of the second substrate, and the plurality of inorganic insulating layers is offset from an area where the tip end of the second substrate overlaps the third line pattern of the plurality of second link lines.
13 . The display device according to claim 12 , wherein the plurality of inorganic insulating layers is disposed except an area between third line patterns of two adjacent first link lines among the plurality of first link lines.
14 . The display device according to claim 12 , wherein the plurality of second link lines each has a same width as each of the plurality of first link lines.
15 . The display device according to claim 1 , wherein the pad part includes a plurality of pad parts, and the plurality of inorganic insulating layers are disposed in all areas except an area between the plurality of pad parts.
16 . A display device, comprising: a first substrate which includes an active area and a non-active area and includes one or more of a transparent conductive oxide or an oxide semiconductor; a plurality of signal lines disposed on the first substrate in the active area; a plurality of link lines connected to the plurality of signal lines and disposed extending to the non-active area; a pad part connected to the plurality of link lines in the non-active area; a plurality of inorganic insulating layers disposed to overlap the plurality of link lines on the first substrate; a second substrate disposed on the first substrate; and a filling layer disposed on the first substrate, wherein a first link line of a plurality of first link lines among the plurality of link lines includes: a first line pattern disposed adjacent to the active area; a second line pattern spaced apart from the first line pattern and disposed close to an outer periphery of the first substrate; and a third line pattern which connects the first line pattern and the second line pattern of the first link line, and wherein the filling layer is disposed in an area overlapping a tip end of the second substrate, the tip end of the second substrate overlapping the third line pattern of the first link line, wherein the plurality of inorganic insulating layers includes a first passivation layer disposed on the first line pattern and the second line pattern of the first link line, and the third line pattern of the first link line is disposed on the first passivation layer and connects the first line pattern and the second line pattern of the first link line each through a contact hole in the first passivation layer.
17 . The display device according to claim 16 , wherein the filling layer is disposed under the third line pattern of the first link line and has a flat upper surface.
18 . The display device according to claim 16 , wherein the filling layer is enclosed by the third line pattern of the first link line, the first passivation layer, and the first substrate.
19 . The display device according to claim 16 , wherein the plurality of first link lines are each connected to a pad electrode located at a tip end of the pad part.
20 . The display device according to claim 16 , wherein the plurality of link lines further includes a plurality of second link lines each having a same width as the first link line, and the plurality of second link lines each includes: a first line pattern disposed adjacent to the active area; a second line pattern spaced apart from the first line pattern of the second link line and disposed close to an outer periphery of the first substrate; and a third line pattern disposed between the first line pattern and the second line pattern of the second link line, and the filling layer is disposed in an area where the tip end of the second substrate overlaps the third line pattern of the second link line.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the priority of Korean Patent Application No. 10-2022-0103432 filed on Aug. 18, 2022, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference. BACKGROUND Technical Field The present disclosure relates to a display device that improves moisture blocking performance, and suppresses the occurrence of cracks in an outer peripheral portion. Description of the Related Art Display devices used for a monitor of a computer, a television, or a cellular phone include an organic light emitting display device (OLED) and a liquid crystal display device (LCD). The OLED is a self-emitting device, and the LCD requires a separate light source. Display devices have a wide range of diverse applications, including personal digital assistants, as well as monitors of computers and televisions. A display device with a large display area, and reduced volume and weight is being studied. Recently, a flexible display device has attracted attention as a next-generation display device. In the flexible display device, display elements and lines are formed on a flexible substrate made of flexible plastic, and the flexible display device may display an image even when folded or rolled. BRIEF SUMMARY The present disclosure is directed to a display device which does not use a plastic substrate and thus improves moisture blocking performance, and suppresses the occurrence of cracks in an outer peripheral portion. An implementation of the present disclosure provides a display device, which uses, as a substrate, one of a transparent conductive oxide layer and an oxide semiconductor layer instead of a plastic substrate. An implementation of the present disclosure provides a display device, which suppresses the occurrence of cracks in a first substrate and a plurality of inorganic insulating layers. The cracks may occur in a part of an outer peripheral portion of the display device where a flexible film is disposed. An implementation of the present disclosure provides a display device which suppresses the occurrence of cracks in a link line and the propagation of cracks. Technical features and benefits of the present disclosure are not limited to those mentioned above, and other technical features and benefits, which are not mentioned above, can be clearly understood by those skilled in the art from the following descriptions. According to an aspect of the present disclosure, there is provided a display device. The display device comprises a first substrate which includes an active area with a plurality of sub-pixels and a non-active area enclosing the active area and is made of one of transparent conductive oxides or oxide semiconductors, a plurality of signal lines disposed on the first substrate, a pad part disposed on the first substrate in the non-active area, a plurality of link lines which connects the pad part and the plurality of signal lines, a plurality of inorganic insulating layers disposed between the first substrate and the plurality of link lines; and a second substrate disposed on the first substrate and the plurality of link lines, wherein a plurality of first link lines among the plurality of link lines includes a first line pattern connected to the plurality of signal lines, a second line pattern connected to the pad part; and a third line pattern which connects the first line pattern and the second line pattern of the first link line and overlaps a tip end of the second substrate, and the plurality of inorganic insulating layers is disposed except an area where the tip end of the second substrate overlaps the third line pattern of the first link line to improve moisture blocking performance, and suppress the occurrence of cracks in an outer peripheral portion. According to another aspect of the present disclosure, there is provided a display device. The display device comprises a first substrate which includes an active area and a non-active area enclosing the active area and is made of one of transparent conductive oxides or oxide semiconductors, a plurality of signal lines disposed on the first substrate in the active area, a plurality of link lines connected to the plurality of signal lines and disposed extending to the non-active area, a pad part connected to the plurality of link lines in the non-active area, a plurality of inorganic insulating layers disposed to overlap the plurality of link lines on the first substrate, a second substrate disposed on the first substrate, and a filling layer disposed in an area overlapping a tip end of the second substrate on the first substrate, wherein a plurality of first link lines among the plurality of link lines includes a first line pattern disposed adjacent to the active area, a second line pattern spaced apart from the first line pattern and disposed close to an outer periphery of the first substrate; and a third line pattern which connects the first line pattern and