# US 12,223,888 B2 · Display device and method of fabricating the same

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- Number: US 12,223,888 B2
- Document ID: US12223888B2
- Status: Granted
- Kind: B2
- Application number: 18/508,214
- Filed: 2023-11-13
- Published: 2024-03-14
- Granted: 2025-02-11
- Earliest claimed: 2019-02-25
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Min Jae Jeong; Kyung Bae Kim; Chong Chul Chai; Kyung Hoon Chung
- Web page: https://patentgrep.com/patent/US12223888B2

## CPC

- G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED]
- H10H 20/83: Electrodes
- H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls
- H10W 90/00: Package configurations
- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 2300/0426: Layout of electrodes and connections
- G09G 2300/0443: with several sub-pixels for the same colour in a pixel, not specifically used to display gradations (G09G3/364 takes precedence)
- G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing
- G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G 2300/0861: with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
- G09G 2310/0278: Details of driving circuits arranged to drive both scan and data electrodes
- G09G 2320/045: Compensation of drifts in the characteristics of light emitting or modulating elements
- H10H 20/01: Manufacture or treatment
- H10H 20/032: {of electrodes}
- H10H 20/0364: {of interconnections}
- H10H 20/821: of the light-emitting regions, e.g. non-planar junctions
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- 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 light-emitting diode including a first conductivity-type semiconductor, an active layer, and a second conductivity-type semiconductor; a first voltage line to which a first voltage is applied; a second voltage line to which a second voltage is applied; a first transistor including a source electrode electrically connected to the first voltage line and a drain electrode electrically connected to a first electrode of the light-emitting diode and to the first conductivity-type semiconductor; a second transistor including a drain electrode electrically connected to a gate electrode of the first transistor and a source electrode electrically connected to a data line to apply a data signal; a capacitor electrically connected to the gate electrode of the first transistor and the first electrode; and a third transistor including a source electrode electrically connected to the second voltage line and a drain electrode electrically connected to the first electrode.

## Claims

### Claim 1

A display device comprising:
a substrate;
a circuit element layer on the substrate, the circuit element layer comprising:
a first transistor;
a second transistor comprising a gate electrode connected to a first scan line, and one electrode connected to one electrode of the first transistor;
a third transistor comprising a gate electrode connected to a second scan line, and one electrode connected to a gate electrode of the first transistor;
an insulating layer on the gate electrode of the second transistor and the gate electrode of the third transistor; and
a first conductive pattern electrically connected to the one electrode of the first transistor and the one electrode of the second transistor;
a first electrode and a second electrode on the circuit element layer and spaced from each other; and
a light emitting element on the first electrode and the second electrode,
wherein one end of the light emitting element is electrically connected to the first conductive pattern,
wherein the gate electrode of the second transistor and the gate electrode of the third transistor are located between the insulating layer and the substrate, and
wherein the insulating layer is located between the first conductive pattern and the gate electrode of the second transistor.

### Claim 2 (depends on 1)

The display device of claim 1, wherein the insulating layer includes a first surface facing the substrate and a second surface opposite to the first surface, and
wherein the first conductive pattern is located directly on the second surface of the insulating layer.

### Claim 3 (depends on 2)

The display device of claim 2, further comprising:
a data line electrically connected to the third transistor,
wherein the data line is located directly on the second surface of the insulating layer.

### Claim 4 (depends on 1)

The display device of claim 1, wherein the first conductive pattern is directly connected to the one electrode of the first transistor and the one electrode of the second transistor.

### Claim 5 (depends on 4)

The display device of claim 4, wherein when a first scan signal is applied to the first scan line and the second transistor is turned on, a second scan signal is not applied to the second scan line, and the third transistor is turned off.

### Claim 6 (depends on 5)

The display device of claim 5, further comprising: a first pixel and a second pixel, each of the first pixel and the second pixel comprising the first transistor, the second transistor, the third transistor, and the first conductive pattern,
wherein the gate electrode of the second transistor of the first pixel is connected to the first scan line that is different from the first scan line connected to the gate electrode of the second transistor of the second pixel.

### Claim 7 (depends on 6)

The display device of claim 6,
wherein when the first scan signal is applied to the first scan line of the first pixel and the second transistor of the first pixel is turned on,
the second scan signal is not applied to the second scan line,
the third transistor of the first pixel and the third transistor of the second pixel are turned off, and
the first scan signal is not applied to the first scan line of the second pixel and the second transistor of the second pixel is turned off.

### Claim 8 (depends on 6)

The display device of claim 6,
wherein when the first scan signal is applied to the second scan line of the first pixel and the second transistor of the second pixel is turned on,
the second scan signal is not applied to the second scan line,
the third transistor of the first pixel and the third transistor of the second pixel are turned off, and
the first scan signal is not applied to the first scan line of the first pixel, and the second transistor of the first pixel is turned off.

### Claim 9 (depends on 4)

The display device of claim 4, wherein the first transistor and the second transistor are electrically connected to a first voltage line, and
the second electrode is electrically connected to a second voltage line.

### Claim 10 (depends on 1)

The display device of claim 1,
wherein the circuit element layer further comprises:
a fourth transistor comprising a gate electrode connected to the second scan line, and one electrode connected to another electrode of the first transistor;
a fifth transistor comprising a gate electrode connected to a third scan line, and one electrode connected to another electrode of the second transistor; and
a sixth transistor comprising a gate electrode connected to a fourth scan line, and two electrodes connected to the first transistor and the second transistor.

### Claim 11 (depends on 10)

The display device of claim 10, wherein:
when a first scan signal is applied to the first scan line and the second transistor is turned on,
a second scan signal is not applied to the second scan line, and the third transistor and the fourth transistor are turned off,
a third scan signal is not applied to the third scan line, and the fifth transistor is turned off, and
a fourth scan signal is not applied to the fourth scan line, and the sixth transistor is turned off.

### Claim 12 (depends on 11)

The display device of claim 11, further comprising:
a first pixel and a second pixel, each of the first pixel and the second pixel comprising the first to sixth transistors,
wherein the gate electrode of the second transistor of the first pixel is connected to the first scan line that is different from the first scan line connected to the gate electrode of the second transistor of the second pixel.

### Claim 13 (depends on 12)

The display device of claim 12, wherein:
when the first scan signal is applied to the first scan line of the first pixel and the second transistor of the first pixel is turned on,
the second scan signal is not applied to the second scan line, and the third transistor and the fourth transistor are turned off,
the third scan signal is not applied to the third scan line, and the fifth transistor is turned off,
the fourth scan signal is not applied to the fourth scan line, and the sixth transistor is turned off, and
the first scan signal is not applied to the first scan line of the second pixel and the second transistor of the second pixel is turned off.

### Claim 14 (depends on 12)

The display device of claim 12, wherein:
when the first scan signal is applied to the second scan line of the first pixel and the second transistor of the second pixel is turned on,
the second scan signal is not applied to the second scan line, and the third transistor and the fourth transistor are turned off,
the third scan signal is not applied to the third scan line, and the fifth transistor is turned off,
the fourth scan signal is not applied to the fourth scan line, and the sixth transistor is turned off, and
the first scan signal is not applied to the first scan line of the first pixel and the second transistor of the first pixel is turned off.

### Claim 15 (depends on 10)

The display device of claim 10, wherein:
the first transistor is electrically connected to a first voltage line,
the second electrode is electrically connected to a second voltage line, and
the second transistor is electrically connected to a third voltage line.

### Claim 16 (depends on 1)

The display device of claim 1, further comprising a first contact electrode on the first electrode; and
a second contact electrode on the second electrode,
wherein the first contact electrode contacts a first end portion of the light emitting element, and the second contact electrode contacts a second end portion of the light emitting element.

### Claim 17 (depends on 16)

The display device of claim 16, wherein the first contact electrode is electrically connected to the first conductive pattern.