# US 11,906,844 B2 · Light emitting device, backlight, and display panel with reflective layer

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- Number: US 11,906,844 B2
- Document ID: US11906844B2
- Status: Granted
- Kind: B2
- Application number: 18/151,403
- Filed: 2023-01-06
- Published: 2023-05-25
- Granted: 2024-02-20
- Earliest claimed: 2020-11-20
- Assignees: Lextar Electronics Corporation
- Applicants: Lextar Electronics Corporation
- Inventors: Yun-Yi Tien; Yu-Chang Wu; Yu-Li Chang
- Web page: https://patentgrep.com/patent/US11906844B2

## CPC

- G02F 1/133603: {with LEDs}
- G02F 1/133607: {the light controlling member including light directing or refracting elements, e.g. prisms or lenses}
- G02F 1/133611: {including means for improving the brightness uniformity}
- G02F 1/133614: {using photoluminescence, e.g. phosphors illuminated by UV or blue light}
- H10H 20/01: Manufacture or treatment
- H10H 20/853: characterised by their shape
- H10H 20/856: Reflecting means
- H10W 90/00: Package configurations
- G02F 2202/36: Micro- or nanomaterials
- H10H 20/0362: {of encapsulations}
- H10H 20/0363: {of optical field-shaping means}
- H10H 20/8513: {having two or more wavelength conversion materials}
- H10H 20/8515: {not being in contact with the bodies}
- H10H 20/854: characterised by their material, e.g. epoxy or silicone resins
- H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls
- H10H 20/882: {Scattering means (H10H20/82 takes precedence)}
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- 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 light emitting device includes a substrate, a conductive layer, first and second reflective layers, a light emitting element, and an encapsulation layer. The conductive layer is disposed on the substrate. The first reflective layer covers the conductive layer and has an opening exposing a portion of the conductive layer. The light emitting element is disposed in the opening and electrically connects to the conductive layer. The second reflective layer is disposed on the first reflective layer and surrounds the light emitting element. The second reflective layer has an outer diameter. A top surface of the second reflective layer is lower than a top surface of the light emitting element. The encapsulation layer covers the light emitting element. There is a height between a highest point of the encapsulation layer and an upper surface of the first reflective layer. The encapsulating layer is directly contact with the outer diameter.

## Claims

### Claim 1

A light emitting device, comprising:
a substrate;
a conductive layer disposed on the substrate;
a first reflective layer covering the conductive layer, the first reflective layer having an opening exposing a portion of the conductive layer;
a light emitting element disposed in the opening and electrically connected to the conductive layer;
a second reflective layer disposed on the first reflective layer and surrounding the light emitting element, the second reflective layer having an outer diameter, wherein a top surface of the second reflective layer is lower than a top surface of the light emitting element, wherein a height of the light emitting element is greater than a sum of heights of the first reflective layer and the second reflective layer; and
an encapsulating layer covering the light emitting element, a height between a highest point of the encapsulation layer and an upper surface of the first reflective layer being 0.1 to 0.5 times the outer diameter, wherein the encapsulating layer is in direct contact with the outer diameter of the second reflective layer.

### Claim 2 (depends on 1)

The light emitting device of claim 1, wherein the second reflective layer has an inner diameter, and a difference between the outer diameter and the inner diameter ranges from 0.05 mm to 0.6 mm.

### Claim 3 (depends on 1)

The light emitting device of claim 1, wherein the first reflective layer and the second reflective layer respectively comprise a white ink.

### Claim 4 (depends on 1)

The light emitting device of claim 1, wherein the second reflective layer has a thickness, and the thickness ranges from 20 um to 60 um.

### Claim 5 (depends on 1)

The light emitting device of claim 1, wherein the outer diameter ranges from 2.0 mm to 4.5 mm.

### Claim 6 (depends on 1)

The light emitting device of claim 1, wherein the encapsulating layer has an arc-shaped outer surface.

### Claim 7 (depends on 1)

The light emitting device of claim 1, wherein the encapsulating layer has a width gradually decreasing by a constant amount from bottom to top, and the encapsulating layer has an arc-shaped top surface.

### Claim 8 (depends on 1)

The light emitting device of claim 1, wherein the encapsulating layer has a width gradually decreasing by a constant amount from bottom to top, and the encapsulating layer has a flat top surface.

### Claim 9 (depends on 1)

A backlight, comprising:
a plurality of light emitting devices of claim 1, wherein any two adjacent light emitting devices are separated by a distance, and the outer diameter is less than 0.5 times the distance.

### Claim 10 (depends on 9)

A display panel, comprising:
the backlight of claim 9;
a lower diffuser disposed on the backlight;
a quantum dot layer disposed on the lower diffuser;
an optical film disposed on the quantum dot layer;
an upper diffuser disposed on the optical film; and
a liquid crystal panel disposed over the upper diffuser.

### Claim 11 (depends on 10)

The display panel of claim 10, wherein the optical film comprises a prism sheet.

### Claim 12 (depends on 10)

The display panel of claim 10, wherein the optical film comprises a brightness enhancement film.

### Claim 13 (depends on 10)

The display panel of claim 10, wherein the quantum dot layer comprises a red quantum dot, a green quantum dot, a blue quantum dot, or combinations thereof.