# US 10,503,010 B2 · Thin direct-view LED backlights

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- Number: US 10,503,010 B2
- Document ID: US10503010B2
- Status: Granted
- Kind: B2
- Application number: 15/593,697
- Filed: 2017-05-12
- Published: 2017-08-31
- Granted: 2019-12-10
- Earliest claimed: 2012-08-22
- Assignees: Seoul Semiconductor Co., Ltd.; InteLED Corp.
- Applicants: Seoul Semiconductor Co., Ltd.; InteLED Corp.
- Inventors: David Pelka
- Web page: https://patentgrep.com/patent/US10503010B2

## CPC

- G02F 1/133606: {including a specially adapted diffusing, scattering or light controlling members}
- F21V 5/048: {the lens being a simple lens adapted to cooperate with a point-like source for emitting mainly in one direction and having an axis coincident with the main light transmission direction, e.g. convergent or divergent lenses, plano-concave or plano-convex lenses}
- F21V 5/08: producing an asymmetric light distribution
- G02B 19/0014: {at least one surface having optical power}
- G02B 19/0061: {the light source comprising a LED}
- G02B 19/0071: {adapted to illuminate a complete hemisphere or a plane extending 360 degrees around the source}
- G02F 1/133603: {with LEDs}
- G02F 1/133611: {including means for improving the brightness uniformity}
- F21Y 2115/10: Light-emitting diodes [LED]
- G02F 1/133607: {the light controlling member including light directing or refracting elements, e.g. prisms or lenses}
- 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
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED

## Abstract

A light-emitting apparatus including a light-emitting element and a lens covering the light-emitting element. The lens includes an upper surface having a convex shape and a lower surface including a cavity to which light emitted from the light-emitting elements is incident, in which the cavity includes an apex facing an upper surface of the light-emitting element and configured to reduce Fresnel reflections emitted vertically.

## Claims

### Claim 1

A light-emitting apparatus comprising:
a light-emitting element;
a lens covering the light-emitting element, the lens comprising:
an upper surface having a convex shape; and
a lower surface comprising a cavity to which light emitted from the light-emitting elements is incident; and
a unit cell comprising a film stack, the film stack comprising:
a diffuser; and
at least one brightness enhancement film (BEF) disposed on the diffuser; and
an absorption film,
wherein the cavity comprises an apex facing an upper surface of the light-emitting element and configured to reduce Fresnel reflections emitted vertically,
wherein the light-emitting element is disposed in a hole formed at the central portion of a bottom floor of the unit cell, and
wherein opposing surfaces of the absorption film each comprises an anti-reflective coating.

### Claim 2 (depends on 1)

The light-emitting apparatus of claim 1, wherein the cavity has a pyramidal shape in a cross-sectional view.

### Claim 3 (depends on 2)

The light-emitting apparatus of claim 2, wherein each side of the cavity crosses a side of the light-emitting element in a plan view.

### Claim 4 (depends on 3)

The light-emitting apparatus of claim 3, wherein a height of the cavity is about 0.5 mm.

### Claim 5 (depends on 1)

The light-emitting apparatus of claim 1, wherein:
a diameter of the lens is in a range of 12 mm and 16 mm; and
a thickness of the lens is in a range of 3.5 mm and 4.5 mm.

### Claim 6 (depends on 1)

The light-emitting apparatus of claim 1, wherein the cavity has a conical shape in a cross-sectional view.

### Claim 7 (depends on 6)

The light-emitting apparatus of claim 6, wherein a hypotenuse of the conical shaped cavity has a curvature.

### Claim 8 (depends on 7)

The light-emitting apparatus of claim 7, wherein the hypotenuse of the conical shaped cavity has a concave shape.

### Claim 9 (depends on 8)

The light-emitting apparatus of claim 8, wherein:
the upper surface of the lens comprises a cusp formed in the center portion of the upper surface; and
the apex of the cavity substantially adjoins the cusp in a cross-sectional view.

### Claim 10 (depends on 1)

The light-emitting apparatus of claim 1, wherein:
a bottom surface of the cavity has a polygonal shape; and
a side wall of the cavity forms an acute angle with respect to an axis vertical to the bottom surface of the cavity.

### Claim 11

A light-emitting apparatus comprising:
a light-emitting element; and
a lens covering the light-emitting element, the lens comprising:
an upper surface having a convex shape; and
a lower surface comprising a cavity to which light emitted from the light-emitting elements is incident; and
a unit cell comprising a film stack, the film stack comprising:
a diffuser; and
at least one brightness enhancement film (BEF) disposed on the diffuser; and
an absorption film,
wherein the cavity comprises an apex facing an upper surface of the light-emitting element and configured to reduce Fresnel reflections emitted vertically,
wherein the light-emitting element is disposed in a hole formed at the central portion of a bottom floor of the unit cell,
wherein the absorption film is disposed on a top surface of the film stack, and
wherein a portion of the absorption film overlapping the light-emitting element has the lowest transmissivity.

### Claim 12 (depends on 1)

A backlight unit, comprising:
a plurality of the light-emitting apparatus of claim 1 disposed in a matrix form,
wherein the light-emitting apparatus disposed in each row overlap the light-emitting apparatus disposed in a successive row in a column direction.

### Claim 13 (depends on 12)

The backlight unit of claim 12, wherein a distance between adjacent light-emitting apparatus is 100 mm.

### Claim 14 (depends on 1)

A backlight unit, comprising:
a plurality of the light-emitting apparatus of claim 1 disposed in a matrix form,
wherein the light-emitting apparatus disposed in each row do not overlap the light-emitting apparatus disposed in a successive row in a column direction.