# US 12,120,933 B2 · Display device and tiled display device including the same

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- Number: US 12,120,933 B2
- Document ID: US12120933B2
- Status: Granted
- Kind: B2
- Application number: 17/379,445
- Filed: 2021-07-19
- Published: 2022-01-27
- Granted: 2024-10-15
- Earliest claimed: 2020-07-23
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Jae Been Lee; Yi Joon Ahn; Sung Hoon Kim; Eun Kyung Yeon
- Web page: https://patentgrep.com/patent/US12120933B2

## CPC

- H10K 59/18: Tiled displays
- H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls
- H10K 59/124: Insulating layers formed between TFT elements and OLED elements
- H10K 59/131: Interconnections, e.g. wiring lines or terminals
- H10W 90/00: Package configurations
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

A display device includes: a substrate comprising a first contact hole; a thin-film transistor layer on a first surface of the substrate and comprising a plurality of insulating layers and a thin-film transistor; an etching stopper on one or more of the insulating layers and contacting the substrate through a second contact hole surrounding the first contact hole in a plan view; a connection line on the etching stopper; and a pad part on a second surface of the substrate opposite the first surface of the substrate and connected to the connection line through the first contact hole.

## Claims

### Claim 1

A display device comprising:
a substrate comprising a first contact hole;
a thin-film transistor layer on a first surface of the substrate and comprising a plurality of insulating layers and a thin-film transistor;
an etching stopper on one or more of the insulating layers and contacting the substrate through a second contact hole surrounding the first contact hole in a plan view;
a connection line on the etching stopper; and
a pad part on a second surface of the substrate opposite the first surface of the substrate and connected to the connection line through the first contact hole,
wherein the first contact hole and the second contact hole are spaced apart from each other in a common layer in a plan view.

### Claim 2 (depends on 1)

The display device of claim 1, wherein the insulating layers comprise:
a gate insulating layer on the substrate;
an interlayer insulating film on the gate insulating layer; and
a passivation layer on the interlayer insulating film,
wherein the etching stopper is on the interlayer insulating film.

### Claim 3 (depends on 2)

The display device of claim 2, further comprising a light emitting element layer on the thin-film transistor layer and having a light emitting element connected to the thin-film transistor, wherein the thin-film transistor layer further comprises a connection electrode on the interlayer insulating film and connected between a first electrode of the thin-film transistor and the light emitting element.

### Claim 4 (depends on 2)

The display device of claim 2, wherein the first contact hole additionally passes through the gate insulating layer, the interlayer insulating film, and the etching stopper.

### Claim 5 (depends on 2)

The display device of claim 2, wherein a portion of the etching stopper inserted into the second contact hole surrounds the pad part at a distance.

### Claim 6

A display device comprising:
a substrate comprising a first contact hole;
a thin-film transistor layer on a first surface of the substrate and comprising a plurality of insulating layers and a thin-film transistor;
an etching stopper on at least one of the insulating layers and contacting the substrate through a second contact hole surrounding the first contact hole in a plan view; and
a pad part on a second surface of the substrate opposite the first surface of the substrate and connected to the etching stopper through the first contact hole,
wherein the first contact hole and the second contact hole are spaced apart from each other in a common layer plan view.

### Claim 7 (depends on 6)

The display device of claim 6, wherein the insulating layers comprise:
a gate insulating layer on the substrate;
an interlayer insulating film on the gate insulating layer; and
a passivation layer on the interlayer insulating film,
wherein the etching stopper is on the interlayer insulating film.

### Claim 8 (depends on 7)

The display device of claim 7, wherein the first contact hole additionally passes through the gate insulating layer and the interlayer insulating film.

### Claim 9 (depends on 6)

The display device of claim 6, wherein the insulating layers comprise:
a gate insulating layer on the substrate;
an interlayer insulating film on the gate insulating layer; and
a passivation layer on the interlayer insulating film,
wherein the etching stopper is on the gate insulating layer.

### Claim 10 (depends on 9)

The display device of claim 9, wherein the first contact hole additionally passes through the gate insulating layer.

### Claim 11 (depends on 6)

The display device of claim 6, further comprising:
a flexible film on the second surface of the substrate and connected to the pad part; and
a source driver on the flexible film.