# US 12,218,281 B2 · Display device including electric field forming auxiliary electrode and method of manufacturing the same

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- Number: US 12,218,281 B2
- Document ID: US12218281B2
- Status: Granted
- Kind: B2
- Application number: 17/590,488
- Filed: 2022-02-01
- Published: 2023-01-12
- Granted: 2025-02-04
- Earliest claimed: 2021-07-07
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., LTD.
- Inventors: Israel Esteban Lazo Martinez; Yun Jang; Suk Hoon Kang; Seung Beom Park; Duck Jong Suh
- Web page: https://patentgrep.com/patent/US12218281B2

## CPC

- H10H 20/8316: {Multi-layer electrodes comprising at least one discontinuous layer}
- H10W 90/00: Package configurations
- H10H 20/01: Manufacture or treatment
- H10H 20/835: {Reflective materials}
- H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls
- H10H 20/032: {of electrodes}
- H10H 20/0364: {of interconnections}
- H10H 20/819: characterised by their shape, e.g. curved or truncated substrates
- 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

According to an embodiment of the disclosure, a display device includes a first electrode and a second electrode that are disposed on a substrate and spaced apart from each other, a light emitting element disposed between the first electrode and the second electrode, and an auxiliary electrode disposed on the substrate and overlapping the light emitting element such that the auxiliary electrode forms an electric field in an area where the light emitting element is disposed.

## Claims

### Claim 1

A display device comprising:
a first electrode and a second electrode that are disposed on a substrate and spaced apart from each other;
a light emitting element disposed between the first electrode and the second electrode;
an auxiliary electrode disposed on the substrate and overlapping the light emitting element such that the auxiliary electrode forms an electric field in an area where the light emitting element is disposed; and
a power supply line electrically connected to the auxiliary electrode and that provides power to the auxiliary electrode.

### Claim 2 (depends on 1)

The display device according to claim 1, further comprising:
a power line that provides power to the light emitting element through the second electrode; and
a protective layer overlapping the power line,
wherein the auxiliary electrode and the power line are disposed in a same layer.

### Claim 3 (depends on 1)

The display device according to claim 1, further comprising:
a transistor electrically connected to the light emitting element, the transistor including:
a first transistor electrode;
a second transistor electrode; and
a gate electrode,
wherein the auxiliary electrode and the gate electrode are disposed in a same layer.

### Claim 4 (depends on 1)

The display device according to claim 1, further comprising:
a transistor electrically connected to the light emitting element, the transistor including:
a first transistor electrode;
a second transistor electrode; and
a gate electrode; and
a lower electrode layer disposed on the substrate and having at least a portion overlapping the transistor,
wherein the auxiliary electrode and the lower electrode layer are disposed in a same layer.

### Claim 5 (depends on 1)

The display device according to claim 1, wherein the power supply line and the auxiliary electrode are disposed in different layers.

### Claim 6 (depends on 1)

The display device according to claim 1, wherein the auxiliary electrode includes a reflective material such that the auxiliary electrode reflects light emitted from the light emitting element.

### Claim 7 (depends on 1)

The display device according to claim 1, wherein the auxiliary electrode includes:
a first overlap area overlapping the first electrode; and
a second overlap area overlapping the second electrode.

### Claim 8 (depends on 1)

The display device according to claim 1, wherein a separation distance between the auxiliary electrode and the first electrode is about 2 m or less in a thickness direction of the substrate.

### Claim 9 (depends on 1)

The display device according to claim 1, further comprising:
a first contact electrode electrically connecting the first electrode and the light emitting element; and
a second contact electrode electrically connecting the second electrode and the light emitting element, wherein
a portion of the auxiliary electrode overlaps the first electrode and the first contact electrode, and
at least another portion of the auxiliary electrode overlaps the second electrode and the second contact electrode.

### Claim 10 (depends on 1)

The display device according to claim 1, wherein
the first electrode and the second electrode are spaced apart in a first direction, and
the auxiliary electrode extends in a second direction intersecting the first direction.

### Claim 11

A method of manufacturing a display device, the method comprising:
providing a lifting electrode on a substrate;
forming a protective layer on the lifting electrode;
providing a first electrode and a second electrode on the protective layer;
providing an ink including a light emitting element and a solvent on the substrate;
performing a first alignment operation of positioning the light emitting element between the first electrode and the second electrode by providing an electrical signal to the first electrode and the second electrode;
performing a second alignment operation of lifting the light emitting element by providing an electrical signal to the lifting electrode; and
performing a third alignment operation of changing a position of the light emitting element by providing an electrical signal to the first electrode and the second electrode and positioning the light emitting element between the first electrode and the second electrode.

### Claim 12 (depends on 11)

The method according to claim 11, further comprising:
forming a lifting power supply line on the substrate; and
electrically connecting the lifting power supply line and the lifting electrode.

### Claim 13 (depends on 11)

The method according to claim 11, further comprising:
forming a first bank and a second bank protruding in a thickness direction of the substrate on the protective layer thereby defining a space where a fluid is accommodated.

### Claim 14 (depends on 13)

The method according to claim 13, wherein the providing of the ink comprises providing the ink between the first bank and the second bank.

### Claim 15 (depends on 11)

The method according to claim 11, wherein
the light emitting element is provided in plural,
each light emitting element includes:
a first semiconductor layer that is an N-type semiconductor;
a second semiconductor layer that is a P-type semiconductor; and
an active layer disposed between the first semiconductor layer and the second semiconductor layer, and
after performing the first alignment operation, a portion of the light emitting element is disposed so that the first semiconductor layer faces the first electrode, and another portion of the light emitting element is disposed so that the first semiconductor layer faces the second electrode.

### Claim 16 (depends on 15)

The method according to claim 15, further comprising:
forming an insulating layer overlapping the first electrode and the second electrode,
wherein the performing of the first alignment operation comprises contacting the insulating layer and the light emitting element with each other.

### Claim 17 (depends on 16)

The method according to claim 16, wherein the performing of the second alignment operation comprises separating the light emitting element from the insulating layer so that a position of the light emitting element is changed.

### Claim 18 (depends on 17)

The method according to claim 17, wherein the performing of the second alignment operation comprises preventing the light emitting element from contacting the insulating layer.

### Claim 19 (depends on 17)

The method according to claim 17, wherein the performing of the third alignment operation comprises bias-aligning the light emitting element.

### Claim 20 (depends on 11)

The method according to claim 11, wherein
the performing of the first alignment operation comprises providing a first AC signal to the first electrode and the second electrode, and
the performing of the second alignment operation comprises providing a DC signal to the lifting electrode.

### Claim 21 (depends on 20)

The method according to claim 20, wherein
the performing of the third alignment operation is performed after the second alignment operation is performed, and
the method further comprises providing a second AC signal to the first electrode and the second electrode.

### Claim 22 (depends on 21)

The method according to claim 21, wherein a frequency of the second AC signal is greater than a frequency of the first AC signal.

### Claim 23 (depends on 21)

The method according to claim 21, wherein a magnitude of the first AC signal is greater than a magnitude of the second AC signal.

### Claim 24 (depends on 21)

The method according to claim 21, wherein the performing of the third alignment operation is performed after providing the second AC signal and comprises providing a third AC signal to the first electrode and the second electrode.

### Claim 25 (depends on 24)

The method according to claim 24, wherein a frequency of the third AC signal is less than a frequency of the second AC signal.

### Claim 26 (depends on 24)

The method according to claim 24, wherein
the providing of the DC signal, the providing of the second AC signal, and the providing of the third AC signal configure a single cycle, and
the single cycle is performed a plurality of times.

### Claim 27 (depends on 24)

The method according to claim 24, wherein
the providing of the second AC signal and providing the third AC signal configure a single cycle, and
the single cycle is performed a plurality of times.

### Claim 28 (depends on 24)

The method according to claim 24, wherein magnitudes of the second AC signal and the third AC signal are less than about 10 Vpp.

### Claim 29

A method of manufacturing a display device, the method comprising:
providing a lifting electrode on a substrate;
forming a protective layer on the lifting electrode;
providing a first electrode and a second electrode on the protective layer;
providing an ink including a light emitting element and a solvent on the substrate;
performing a landing step of providing a first AC signal to the first electrode and the second electrode to position the light emitting element between the first electrode and the second electrode;
performing a lifting step of providing a DC signal to the lifting electrode to separate the light emitting element from the first electrode and the second electrode; and
performing a rotation step of changing a position of the light emitting element by providing a second AC signal and a third AC signal successively to the first electrode and the second electrode.