# US 12,765,186 B2 · Display device having a plurality of conductive layers

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- Number: US 12,765,186 B2
- Document ID: US12765186B2
- Status: Granted
- Kind: B2
- Application number: 18/362,812
- Filed: 2023-07-31
- Published: 2024-04-11
- Granted: 2026-10-13
- Earliest claimed: 2022-10-11
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., LTD.
- Inventors: Hyun Eok Shin; Sang Gab Kim; Joon Yong Park; Do Keun Song; Su Kyoung Yang; Dong Min Lee
- Web page: https://patentgrep.com/patent/US12765186B2

## CPC

- H10K 59/123: Connection of the pixel electrodes to the thin film transistors [TFT]
- H10D 86/441: {Interconnections, e.g. scanning lines}
- H10D 86/60: wherein the TFTs are in active matrices
- H10K 59/1213: {the pixel elements being TFTs}
- H10K 2102/20: Metallic electrodes, e.g. using a stack of layers
- H10K 2102/351: {Thickness}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES

## Abstract

A display device is provided. The display device includes a substrate including a display area and a pad area, which is disposed on one side of the display area, a plurality of conductive layers disposed on the substrate, in the display area and the pad area, a passivation layer disposed on the conductive layers, and a plurality of light-emitting elements disposed on the passivation layer, in the display area, and spaced apart from one another, wherein at least one of the conductive layers includes a first metal layer, a second metal layer, which is disposed on the first metal layer, and a third metal layer, which is disposed on the second metal layer, the first metal layer includes vanadium (V), the second metal layer includes aluminum (Al) or an Al alloy, and the third metal layer includes V or titanium (Ti).

## Claims

### Claim 1

A display device comprising:
a substrate including a display area and a pad area on one side of the display area;
a plurality of conductive layers on the substrate, and in the display area and the pad area;
a passivation layer on the conductive layers; and
a plurality of light-emitting elements on the passivation layer and in the display area, the plurality of light-emitting elements being spaced apart from one another,
wherein
at least one of the conductive layers comprises a first metal layer, a second metal layer on the first metal layer, and a third metal layer on the second metal layer in both the display area and the pad area,
the first metal layer comprises vanadium (V),
the second metal layer comprises aluminum (Al) or an Al alloy, and
the third metal layer comprises V or titanium (Ti).

### Claim 2

A display device comprising:
a substrate including a display area and a pad area on one side of the display area;
a plurality of conductive layers on the substrate, and in the display area and the pad area;
a passivation layer on the conductive layers; and
a plurality of light-emitting elements on the passivation layer and in the display area, the plurality of light-emitting elements being spaced apart from one another
wherein
at least one of the conductive layers comprises a first metal layer, a second metal layer on the first metal layer, and a third metal layer on the second metal layer,
the first metal layer comprises vanadium (V),
the second metal layer comprises aluminum (Al) or an Al alloy,
the third metal layer comprises V or titanium (Ti),
a thickness of the second metal layer is greater than a thickness of the first metal layer and a thickness of the third metal layer, and
the thickness of the first metal layer is greater than the thickness of the third metal layer.

### Claim 3 (depends on 2)

The display device of claim 2, wherein the thickness of the first metal layer is from 1000 Å to half the thickness of the second metal layer.

### Claim 4 (depends on 2)

The display device of claim 2, wherein
the thickness of the second metal layer is 2000 Å to 5000 Å, and
the thickness of the first metal layer is 1000 Å to 2500 Å.

### Claim 5 (depends on 2)

The display device of claim 2, wherein the thickness of the third metal layer is 1/10 of the thickness of the second metal layer.

### Claim 6 (depends on 2)

The display device of claim 2, wherein
the thickness of the second metal layer is 2000 Å to 5000 Å, and
the thickness of the third metal layer is 200 Å to 500 Å.

### Claim 7 (depends on 2)

The display device of claim 2, wherein
the thickness of the second metal layer is 2000 Å to 5000 Å,
the third metal layer comprises Ti, and
the thickness of the third metal layer is 200 Å to 500 Å.

### Claim 8 (depends on 1)

The display device of claim 1, wherein
the at least one of the conductive layers includes a void between the first metal layer and the third metal layer due to removal of part of the second metal layer therefrom.

### Claim 9 (depends on 8)

The display device of claim 8, wherein a width of the void is 5.0 μm to 20.0 μm.

### Claim 10 (depends on 1)

The display device of claim 1, wherein
the second metal layer comprises an aluminum (Al)-nickel (Ni)-lanthanum (La) alloy, and
the Al—Ni—La alloy has a total Ni—La content of 0.1 at % or less based on a total atomic composition of the Al—Ni—La alloy.

### Claim 11 (depends on 1)

The display device of claim 1, further comprising:
a first conductive layer on the substrate;
a buffer layer on the first conductive layer;
a semiconductor layer on the buffer layer;
a gate insulating layer on the semiconductor layer;
a second conductive layer on the gate insulating layer;
an interlayer insulating layer on the second conductive layer; and
a third conductive layer between the interlayer insulating layer and the passivation layer,
wherein the first conductive layer comprises the first, second, and third metal layers.

### Claim 12 (depends on 11)

The display device of claim 11, wherein the second conductive layer comprises the first, second, and third metal layers.

### Claim 13 (depends on 11)

The display device of claim 11, wherein the third conductive layer comprises a base layer comprising Ti, a middle layer on the base layer and comprising Al or an Al alloy, and an upper layer on the middle layer and comprising Ti.

### Claim 14 (depends on 11)

The display device of claim 11, further comprising:
a first pad wire in the pad area and in the same layer as the first conductive layer; and
a second pad wire on the first pad wire and in the same layer as the second conductive layer.

### Claim 15 (depends on 14)

The display device of claim 14, wherein at least one of the first pad wire or the second pad wire comprises the first, second, and third metal layers.

### Claim 16

A display device comprising:
a substrate including a display area and a pad area on one side of the display area;
a first conductive layer on the substrate and comprising a lower metal layer in the display area and a first pad wire in the pad area;
a buffer layer on the first conductive layer;
a semiconductor layer on the buffer layer and overlapping with the lower metal layer in the display area;
a gate insulating layer on the semiconductor layer and the buffer layer;
a second conductive layer on the gate insulating layer and comprising a gate electrode overlapping with the semiconductor layer and in the display area, and a second pad wire overlapping with the first pad wire and in the pad area;
a first interlayer insulating layer on the second conductive layer;
a third conductive layer on the first interlayer insulating layer and comprising a capacitor electrode overlapping with the gate electrode and in the display area;
a second interlayer insulating layer on the third conductive layer;
a fourth conductive layer on the second interlayer insulating layer and comprising a first connection electrode connected to the semiconductor layer and the lower metal layer, and in the display area;
a passivation layer on the fourth conductive layer; and
a plurality of light-emitting elements on the passivation layer and spaced apart from one another,
wherein both the lower metal layer and the first pad wire of the first conductive layer comprise a first metal layer comprising vanadium (V), a second metal layer on the first metal layer and comprising aluminum (Al) or an Al alloy, and a third metal layer on the second metal layer and comprising V or titanium (Ti).

### Claim 17 (depends on 16)

The display device of claim 16, wherein
a thickness of the second metal layer is greater than a thickness of the first metal layer and a thickness of the third metal layer, and
the thickness of the first metal layer is greater than the thickness of the third metal layer.

### Claim 18 (depends on 17)

The display device of claim 17, wherein
the thickness of the first metal layer is from 1000 Å to half the thickness of the second metal layer, and
the thickness of the third metal layer is 1/10 of the thickness of the second metal layer.

### Claim 19 (depends on 16)

The display device of claim 16, wherein at least one of the second conductive layer or the third conductive layer comprises the first, second, and third metal layers.

### Claim 20 (depends on 16)

The display device of claim 16, wherein the fourth conductive layer comprises a base layer comprising Ti, a middle layer on the base layer and comprising Al or an Al alloy, and an upper layer on the middle layer and comprising Ti.