# US 12,119,436 B2 · Display device and manufacturing method therefor

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- Number: US 12,119,436 B2
- Document ID: US12119436B2
- Status: Granted
- Kind: B2
- Application number: 17/432,610
- Filed: 2019-08-23
- Published: 2022-05-19
- Granted: 2024-10-15
- Earliest claimed: 2019-02-21
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Won Ho Lee; Sung-Chan Jo; Jong Hyuk Kang; Hyun Deok Im; Hyun Min Cho; Won Kyu Kim
- Web page: https://patentgrep.com/patent/US12119436B2

## CPC

- H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls
- H10W 90/00: Package configurations
- G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED]
- H10H 20/01: Manufacture or treatment
- H10H 20/8312: {extending at least partially through the bodies}
- G09G 2300/0426: Layout of electrodes and connections
- G09G 2300/0814: used for selection purposes, e.g. logical AND for partial update
- G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing
- 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 2300/0866: by means of changes in the pixel supply voltage
- G09G 2310/0267: Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- H10D 86/451: {characterised by the compositions or shapes of the interlayer dielectrics}
- H10D 86/60: wherein the TFTs are in active matrices
- H10H 20/032: {of electrodes}
- H10H 20/0364: {of interconnections}
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- 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)
- H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES

## Abstract

A display device may include a substrate, pixels disposed on the substrate, each of the pixels including a first electrode, a second electrode, and a plurality of light emitting elements electrically connected between the first and the second electrodes, and a first oscillator disposed on the substrate and electrically connected to a first electrode of a first pixel of the pixels, the first oscillator including at least one transistor and at least one capacitor.

## Claims

### Claim 1

A display device comprising:
a substrate;
pixels disposed on the substrate, each of the pixels comprising:
a first electrode;
a second electrode; and
a plurality of light emitting elements electrically connected between the first and the second electrodes; and
a first oscillator disposed on the substrate and electrically connected to a first electrode of a first pixel of the pixels, the first oscillator converting a direct current (DC) voltage to an alternating current (AC) voltage, supplying the alternating current (AC) voltage to the first electrode of the first pixel of the pixels to align the plurality of light emitting elements between the first and second electrodes, and comprising:
at least one transistor; and
at least one capacitor.

### Claim 2 (depends on 1)

The display device of claim 1, wherein
the first electrode of the first pixel is separated from a first electrode of a second pixel of the pixels, and
the first oscillator is electrically disconnected from the second pixel.

### Claim 3 (depends on 1)

The display device of claim 1, wherein
the substrate includes:
a display area in which an image is displayed; and
a non-display area disposed adjacent to the display area,
the pixels are disposed in the display area, and
the first oscillator is disposed in the non-display area.

### Claim 4 (depends on 3)

The display device of claim 3, further comprising:
a second oscillator and a third oscillator disposed on the non-display area,
wherein the first oscillator, the second oscillator, and the third oscillator are disposed at regular intervals along a perimeter of the display area.

### Claim 5 (depends on 4)

The display device of claim 4, further comprising:
a first power line, a second power line, a third power line, and a fourth power line disposed on the substrate and separated from each other, wherein
each of the pixels is electrically connected between the first power line and the second power line,
the first oscillator is electrically connected to the third power line and the fourth power line, and
each of the third power line and the fourth power line floats when the display device is turned on to display the image.

### Claim 6 (depends on 5)

The display device of claim 5, wherein
the first power line, the second power line, the third power line, the fourth power line, and the first oscillator are included in a pixel circuit layer,
the first electrode and the second electrode are disposed on the pixel circuit layer at positions spaced apart from each other, and
the plurality of light emitting elements are disposed between the first electrode and the second electrode.

### Claim 7 (depends on 6)

The display device of claim 6, further comprising:
an electrode pattern disposed on the pixel circuit layer, overlapping the at least one capacitor of the first oscillator, and electrically connected to the at least one capacitor,
wherein the electrode pattern is separated from the first electrode of the first pixel.

### Claim 8 (depends on 3)

The display device of claim 3, further comprising:
a second oscillator disposed in the display area.

### Claim 9 (depends on 1)

The display device according to of claim 1, wherein the first oscillator is disposed between the pixels.

### Claim 10 (depends on 1)

The display device of claim 1, wherein each of the plurality of light emitting elements comprises a light emitting diode having a size in a range of a nanometer scale to a micrometer scale.

### Claim 11 (depends on 1)

The display device of claim 1, further comprising:
a first power line and a second power line disposed on the substrate, wherein
the first oscillator comprises at least one stage,
the at least one stage each comprises:
a first transistor comprising a first electrode electrically connected to the first power line, a second electrode electrically connected to a first node, and a gate electrode electrically connected to an input terminal;
a second transistor comprising a first electrode electrically connected to the first node, a second electrode electrically connected to the second power line, and a gate electrode electrically connected to the input terminal; and
a first resistor and a first capacitor electrically connected in series between the first node and the second power line, and
a second node to which the first resistor and the first capacitor are electrically connected is electrically connected, as an output terminal, to the input terminal.

### Claim 12 (depends on 11)

The display device of claim 11, wherein
the first oscillator comprises first, second, and third stages,
an output terminal of the first stage is electrically connected to an input terminal of the second stage,
an output terminal of the second stage is electrically connected to an input terminal of the third stage, and
an output terminal of the third stage is electrically connected to an input terminal of the first stage.

### Claim 13

A display device comprising:
a substrate;
pixels disposed on the substrate, each of the pixels comprising:
a first electrode;
a second electrode; and
a plurality of light emitting elements electrically connected between the first and the second electrodes; and
an oscillator disposed on the substrate between the pixels and electrically disconnected from the pixels, the oscillator converting a direct current (DC) voltage to an alternating current (AC) voltage and comprising at least one transistor and at least one capacitor.

### Claim 14

A method of manufacturing a display device, the method comprising:
preparing a substrate comprising:
a pixel circuit layer including an oscillator converting a direct current (DC) voltage to an alternating current (AC) voltage;
a first electrode electrically connected to the oscillator and formed on the pixel circuit layer; and
a second electrode formed on the pixel circuit layer;
supplying light emitting elements between the first electrode and the second electrode; and
aligning the light emitting elements between the first electrode and the second electrode by applying the alternating current (AC) voltage generated by the oscillator to at least one of the first electrode and the second electrode.

### Claim 15 (depends on 14)

The method of claim 14, wherein the oscillator supplies the alternating current (AC) voltage to the first electrode.

### Claim 16 (depends on 15)

The method of claim 15, wherein the aligning of the light emitting elements comprises applying a ground voltage to the second electrode while applying the direct current (DC) voltage to the oscillator.

### Claim 17 (depends on 16)

The method of claim 16, further comprising:
dividing the first electrode by pixel areas; and
separating the first electrode from an output terminal of the oscillator.

### Claim 18 (depends on 16)

The method of claim 16, further comprising:
forming a first contact electrode electrically connecting a first end of each of the light emitting elements to the first electrode, and a second contact electrode electrically connecting a second end of each of the light emitting elements to the second electrode.

### Claim 19 (depends on 16)

The method of claim 16, further comprising:
removing the oscillator by cutting off the substrate between the first electrode and the oscillator.

### Claim 20 (depends on 15)

The method of claim 15, wherein the aligning of the light emitting elements comprises applying an alternating current (AC) voltage from an external alternating current power supply to the first electrode.