Lighting device

Patent metadata

Field	Value
Publication number	US-11828433-B2
Application number	US-202017630972-A
Country	US
Kind code	B2
Filing date	Jul 23, 2020
Priority date	Aug 1, 2019
Publication date	Nov 28, 2023
Grant date	Nov 28, 2023

Abstract

An embodiment may comprise a lighting device comprising: a substrate comprising a first side surface to a fourth side surface; a resin layer including a plurality of grooves including a bottom surface, an exit surface, and an inclined surface; a plurality of light emitting devices disposed inside the grooves and emitting a first light; a reflective layer formed on the inclined surface; and a diffusion layer disposed on the resin layer. The plurality of grooves extends in a direction from the third side surface to the fourth side surface and are arranged in a direction from the first side surface to a second side surface. The plurality of grooves includes a first groove closest to the first side surface of the substrate and a second groove adjacent to the first groove. The first light emitted from the light emitting device disposed in the second groove is reflected off the reflective layer formed on the inclined surface of the second groove, passes through the exit surface of the second groove, is reflected off the reflective layer formed on the inclined surface of the first groove and passes through the resin layer and the diffusion layer.

First claim

The invention claimed is:

1. A lighting device comprising:
a substrate including a first side surface and a second side surface opposite to the first side surface, a third side surface connecting the first side surface and the second side surface, and a fourth side surface opposite the third side surface;
a resin layer having an upper surface and a bottom surface, and a plurality of grooves are formed in the resin layer such that each groove has an opening from the bottom surface, an exit surface extending from the bottom surface toward the upper surface, and an inclined surface inclined at a predetermined angle from a straight line passing through upper and lower ends of the exit surface, respectively, and the opening of each groove is to expose an upper surface of the substrate;
a plurality of light emitting devices disposed on the substrate and inside each of the plurality of grooves and emitting a first light;
a plurality of reflective layers disposed on each of the inclined surfaces of the plurality of grooves;
a plurality of phosphor layers disposed on an upper surface of each of the light emitting devices or a lower surface of each of the reflective layers disposed on the inclined surfaces of the plurality of grooves; and
a diffusion layer disposed on the upper surface of the resin layer;
wherein each of the plurality of grooves is formed to extend toward the fourth side surface of the substrate and the plurality of grooves are arranged toward the second side surface from the first side surface of the substrate,
wherein each of the plurality of light emitting devices, each of the phosphor layers, and each of the reflective layers in each of the plurality of grooves overlap in a vertical direction,
wherein the plurality of grooves includes a first groove closest to the first side surface of the substrate and a second groove adjacent to the first groove,
wherein a first light emitted from a light emitting device disposed in the second groove is converted by a phosphor layer of the second groove and is reflected by a reflective layer disposed on an inclined surface of the second groove, a light reflected by the reflective layer passes through an exit surface of the second groove, and a light passing through the exit surface of the second groove is reflected by a reflective layer disposed on an inclined surface of the first groove and passes through the resin layer and the diffusion layer.

2. The lighting device of claim 1 ,
wherein each of the phosphor layers is disposed on the upper surface of each of the light emitting devices, and
wherein each of the light emitting devices emits light through an upper surface and a plurality of side surfaces.

3. The lighting device of claim 1 ,
wherein each of the phosphor layers is disposed on the lower surface of each of the reflective layers and is not visible from an outside.

4. The lighting device of claim 1 ,
wherein each of the phosphor layers is formed on each of the exit surfaces of the plurality of grooves.

5. The lighting device of claim 1 ,
wherein each of the exit surfaces in each of the plurality of grooves have a concave shape.

6. The lighting device of claim 4 , comprising:
wherein each of the reflective layers includes a reflective member extending in a direction parallel to the upper surface of the substrate from each of the reflective layers disposed on a region where each of the exit surfaces and each of the inclined surfaces are connected.

7. The lighting device of claim 6 ,
wherein the first light emitted from the light emitting device disposed in the second groove is converted into second light having a wavelength different from that of the first light by the phosphor layer and the second light passes through the diffusion layer,
wherein the phosphor layer disposed inside the second groove is disposed under a reflective member disposed inside the second groove.

8. The lighting device of claim 6 ,
wherein the reflective member of each of the reflective layers protrudes from an upper end of each of the exit surfaces of each of the plurality of grooves toward a side surface of the resin layer adjacent to the first side surface of the substrate, and
wherein a portion of the reflective member does not overlap each of the exit surfaces in the vertical direction.

9. The lighting device of claim 1 ,
a portion of each of the inclined surfaces adjacent to the substrate is a curved surface.

10. The lighting device of claim 1 ,
wherein light emitted from the light emitting device disposed in the first groove is emitted through the exit surface of the first groove and through a side surface of the resin layer,
wherein a direction of light emitted from the light emitting device disposed in the first groove and passing through the resin layer is different from a direction of light emitted from the light emitting device disposed in the second groove and passing through the resin layer.

11. A lighting device comprising:
a substrate including a first side surface and a second side surface opposite to the first side surface, a third side surface connecting the first side surface and the second side surface, and a fourth side surface opposite the third side surface;
a resin layer having an upper surface and a bottom surface disposed on the substrate, and a plurality of grooves are formed in the resin layer;
a plurality of light emitting devices disposed on the substrate and disposed inside each of the plurality of grooves;
a reflective layer disposed in each of the plurality of grooves;
a phosphor layer disposed in each of the plurality of grooves; and
a diffusion layer disposed on the resin layer;
wherein each of the plurality of grooves extends from the third side surface to the fourth side surface of the substrate, and is arranged toward the second side surface from the first side surface of the substrate,
wherein each of the plurality of grooves is to expose part of an upper surface of the substrate,
wherein each of the plurality of grooves having an opening from the bottom surface such that the upper surface of the substrate is exposed, an inclined surface facing the opening that provides the exposed upper surface of the substrate, and an exit surface connected between the bottom surface and the inclined surface,
wherein the reflective layer is disposed on a surface of the inclined surface,
wherein the phosphor layer extends from a first end of the reflective layer to a second end of the reflective layer,
wherein the light emitting device, the phosphor layer and the reflective layer overlap in a vertical direction,
wherein the exit surface of each of the plurality of grooves is disposed on a first side of each of the plurality of light emitting devices disposed in each of the grooves.

12. The lighting device of claim 11 ,
wherein each of the light emitting devices emits light through an upper surface and a plurality of side surfaces.

13. The lighting device of claim 11 ,
wherein the phosphor layer is disposed on an entire lower surface of the reflective layer, and is not visually recognized from a front of the lighting device.

14. The lighting device of claim 11 ,
wherein the phosphor layer is in contact with an end of the exit surface in each of the grooves.

15. The lighting device of claim 11 ,
wherein the exit surface in each of the grooves has a concave curved surface.

16. The lighting device of claim 14 ,
wherein the reflective layer includes a reflective member extending in a direction parallel to the upper surface of the substrate in a region where the end of the exit surface a

Assignees

• Lg Innotek Co Ltd

Inventors

• Park Hoon
• Eom Dong Il
• Lee Yu Won

Classifications

• H10W90/00

  Package configurations · CPC title

• H10H20/856

  Reflecting means · CPC title

• H10H20/8515

  not being in contact with the bodies · CPC title

• H10H20/851

  Wavelength conversion means · CPC title

• F21V9/30

  Elements containing photoluminescent material distinct from or spaced from the light source (shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40) · CPC title