# US 12,111,538 B2 · Planar lighting device

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- Number: US 12,111,538 B2
- Document ID: US12111538B2
- Status: Granted
- Kind: B2
- Application number: 17/974,097
- Filed: 2022-10-26
- Published: 2023-02-09
- Granted: 2024-10-08
- Earliest claimed: 2013-01-23
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Yongjin Kim; Munheon Hong; Chilkeun Park; Sangcheon Kim; Mangeun Kim
- Web page: https://patentgrep.com/patent/US12111538B2

## CPC

- G02F 1/133606: {including a specially adapted diffusing, scattering or light controlling members}
- F21V 7/00: Reflectors for light sources (characterised by cooling arrangements F21V29/505)
- F21V 7/0025: {Combination of two or more reflectors for a single light source (array of reflectors for a cluster of light sources F21V7/0083)}
- F21V 11/16: using sheets without apertures, e.g. fixed
- G02F 1/133603: {with LEDs}
- G02F 1/133605: {including specially adapted reflectors}
- G02F 1/133611: {including means for improving the brightness uniformity}
- F21Y 2105/00: Planar light sources
- G02B 6/0055: {Reflecting element, sheet or layer}
- G02B 6/0061: {to provide homogeneous light output intensity}
- G02B 6/0096: {the lights guides being of the hollow type}
- G02F 1/133388: {with constructional differences between the display region and the peripheral region}
- G02F 1/133612: {Electrical details}
- G02F 1/133613: {characterized by the sequence of light sources}
- G02F 1/133614: {using photoluminescence, e.g. phosphors illuminated by UV or blue light}
- G02F 2202/28: Adhesive materials or arrangements
- 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
- 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
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A display device including a lower cover; a circuit substrate on the lower cover; a plurality of light sources disposed on a first portion of the circuit substrate; a reflection layer disposed on a second portion of the circuit substrate; a first adhesive disposed between the second portion of the circuit substrate and the reflection layer; a light regulator including light regulating patterns disposed in the reflection layer; and an optical sheet disposed on the light sources.

## Claims

### Claim 1

A display device comprising:
a liquid crystal panel;
a backlight unit providing light to the liquid crystal panel; and
a lower cover,
wherein the backlight unit is disposed between the liquid crystal panel and the lower cover, and
wherein the backlight unit includes:
a circuit substrate on the lower cover;
a plurality of light sources disposed on the circuit substrate, wherein the plurality of light sources are mounted on the circuit substrate by surface-mounting;
a reflection layer disposed on the circuit substrate;
a first adhesive disposed between the circuit substrate and the reflection layer;
a light regulator including light regulating patterns disposed in the reflection layer, wherein the light regulating patterns change in size according to a position relative to the plurality of light sources; and
an optical sheet disposed on the plurality of light sources.

### Claim 2 (depends on 1)

The display device of claim 1, wherein the first adhesive is disposed between an upper surface of the circuit substrate and a lower surface of the reflection layer.

### Claim 3 (depends on 1)

The display device of claim 1, wherein the lower cover includes a mount groove, and wherein the circuit substrate is disposed in the mount groove.

### Claim 4 (depends on 1)

The display device of claim 1, further comprising a second adhesive between the circuit substrate and the lower cover.

### Claim 5 (depends on 1)

The display device of claim 1, further comprising a spacer between the reflection layer and the optical sheet.

### Claim 6 (depends on 5)

The display device of claim 5, wherein the spacer functions to maintain a gap between the optical sheet and the plurality of light sources.

### Claim 7 (depends on 5)

The display device of claim 5, wherein the spacer functions to reflect light from the plurality of light sources.

### Claim 8 (depends on 5)

The display device of claim 5, wherein the spacer is mounted by applying a third adhesive to the spacer.

### Claim 9 (depends on 1)

The display device of claim 1, wherein the light regulating patterns have a circular shape.

### Claim 10 (depends on 1)

The display device of claim 1, wherein at least two circuit substrates are disposed on the lower cover and are spaced apart by a predetermined distance.

### Claim 11 (depends on 1)

The display device of claim 1, wherein a density of the light regulating patterns close to the plurality of light sources is greater than a density of the light regulating patterns far from the plurality of light sources.

### Claim 12

A display device comprising:
a liquid crystal panel;
a backlight unit providing light to the liquid crystal panel; and
a lower cover,
wherein the backlight unit is disposed between the liquid crystal panel and the lower cover,
wherein the backlight unit includes:
a circuit substrate on the lower cover;
a plurality of light sources disposed on the circuit substrate, wherein the plurality of light sources are mounted on the circuit substrate by surface-mounting;
a reflection layer disposed on the circuit substrate;
an adhesive disposed between the circuit substrate and the reflection layer, wherein the circuit substrate and the reflection layer are indirectly and partially connected through the adhesive;
an optical sheet disposed on the plurality of light sources; and
a spacer forming a gap between the reflection layer and the optical sheet, and
wherein the reflection layer includes a spacing where a respective light source of the plurality of light sources is placed.

### Claim 13 (depends on 12)

The display device of claim 12, wherein the adhesive is disposed between an upper surface of the circuit substrate and a lower surface of the reflection layer.

### Claim 14 (depends on 12)

The display device of claim 12, wherein the lower cover includes a mount groove, and wherein the circuit substrate is disposed in the mount groove.

### Claim 15 (depends on 12)

The display device of claim 12, wherein the spacer functions to maintain a distance between the optical sheet and the plurality of light sources.

### Claim 16 (depends on 12)

The display device of claim 12, wherein the spacer functions to reflect light from the plurality of light sources.

### Claim 17 (depends on 12)

The display device of claim 12, further comprising a light regulator including light regulating patterns disposed in the reflection layer.

### Claim 18 (depends on 17)

The display device of claim 17, wherein the light regulating patterns have a circular shape.