Light-emitting module

Patent metadata

Field	Value
Publication number	US-11508706-B2
Application number	US-202017032543-A
Country	US
Kind code	B2
Filing date	Sep 25, 2020
Priority date	Sep 25, 2019
Publication date	Nov 22, 2022
Grant date	Nov 22, 2022

Abstract

A light-emitting module includes: a lightguide plate having a main surface and including a plurality of unit regions including at least one first unit region and a plurality of second unit regions, the lightguide plate including a plurality of first recesses in the main surface; a plurality of light sources provided at the main surface, each of the light sources being located in the first recess so as to correspond to one of the unit regions; and a light-transmitting member provided in the first recess of each of the unit regions. In the second unit regions, an optical axis of the light sources is coincident with a center of the first recess. In the first unit region, the optical axis of the light source is offset from the center of the first recess, and an upper surface of the light-transmitting member has a first receding part.

First claim

What is claimed is:

1. A light-emitting module comprising:
a lightguide plate having a first main surface and a second main surface opposite to the first main surface, the second main surface being a light emission surface, the lightguide plate including a plurality of unit regions arrayed one-dimensionally or two-dimensionally, the plurality of unit regions including at least one first unit region and a plurality of second unit regions, the lightguide plate including a plurality of first recesses in the first main surface, the plurality of first recesses corresponding to the plurality of unit regions;
a plurality of light sources provided at the first main surface of the lightguide plate, each of the light sources being located in the first recess so as to correspond to one of the plurality of unit regions; and
a light-transmitting member provided in the first recess in each of the plurality of unit regions, the light-transmitting member covering at least a portion of a lateral surface of the light source in each of the plurality of unit regions,
wherein in the plurality of second unit regions, an optical axis of the light source is coincident with a center of the first recess at the first main surface in a plan view,
in the at least one first unit region, the optical axis of the light source is offset from a center of the first recess at the first main surface in the plan view, and
in the at least one first unit region, an upper surface of the light-transmitting member has a first receding part receding toward a bottom surface side of the first recess.

2. The light-emitting module of claim 1 , wherein in the plurality of second unit regions, the upper surface of the light-transmitting member does not have a recession toward the bottom surface side of the first recess.

3. The light-emitting module of claim 1 , wherein
in the plurality of second unit regions, the upper surface of the light-transmitting member has a second receding part receding toward the bottom surface side of the first recess, and
a depth of the second receding part is smaller than a depth of the first receding part.

4. The light-emitting module of claim 1 , wherein
the plurality of unit regions are arranged two-dimensional in row and column directions in an array, and
the at least one first unit region includes a plurality of first unit regions located in an outermost row or column of the array of the plurality of unit regions.

5. The light-emitting module of claim 1 , further comprising a plurality of lens structures provided in the second main surface of the lightguide plate, each of the plurality of lens structures being located so as to correspond to one of the plurality of unit regions.

6. The light-emitting module of claim 5 , wherein
an optical axis of the lens structure is coincident with a center of the first unit region at the second main surface in the plan view, and
the optical axis of the light source is offset from a center of the first unit region at the first main surface in the plan view.

7. The light-emitting module of claim 5 , wherein
the optical axis of the light source is coincident with a center of the first unit region at the first main surface in the plan view, and
an optical axis of the lens structure is offset from a center of the first unit region at the second main surface in the plan view.

8. The light-emitting module of claim 5 , wherein
the optical axis of the light source is offset from a center of the first unit region at the first main surface in the plan view, and
an optical axis of the lens structure is offset from a center of the first unit region at the second main surface in the plan view.

9. The light-emitting module of claim 8 , wherein a direction of the offset of the optical axis of the light source is opposite to a direction of the offset of the optical axis of the lens structure.

10. The light-emitting module of claim 5 , wherein
in the first unit region, the center of the first recess is offset from a center of the first unit region in the plan view, and
an optical axis of the lens structure is coincident with a center of the first unit region at the second main surface in the plan view.

11. The light-emitting module of claim 5 , wherein
in the first unit region, the center of the first recess is coincident with a center of the first unit region in the plan view, and
the optical axis of the lens structures is offset from a center of the first unit region at the second main surface in the plan view.

12. The light-emitting module of claim 6 , wherein
the first unit region has a rectangular shape in the plan view, and
a direction of the offset is parallel with either of two adjoining sides of the rectangular shape in the plan view.

13. The light-emitting module of claim 6 , wherein
the first unit region has a rectangular shape in the plan view, and
a direction of the offset is parallel with a diagonal direction of the rectangular shape in the plan view.

14. The light-emitting module of claim 6 , wherein
the first unit region has a rectangular shape in the plan view, and
a direction of the offset is non-parallel with two adjoining sides of the rectangular shape in the plan view.

15. The light-emitting module of claim 5 , wherein
the lightguide plate has a plurality of second recesses in the second main surface,
each of the plurality of second recesses is located so as to correspond to one of the plurality of unit regions, and
the plurality of lens structures are respectively provided in the plurality of second recesses.

16. The light-emitting module of claim 15 , wherein each of the plurality of lens structures includes a first reflecting layer provided in the second recess.

17. The light-emitting module of claim 1 , further comprising a second reflecting layer covering the first main surface.

18. The light-emitting module of claim 2 , wherein
the plurality of unit regions are two-dimensionally arranged in row and column directions in an array, and
the at least one first unit region includes a plurality of first unit regions located in an outermost row or column of the array of the plurality of unit regions.

19. The light-emitting module of claim 3 , wherein
the plurality of unit regions are two-dimensionally arranged in row and column directions in an array, and
the at least one first unit region includes a plurality of first unit regions located in an outermost row or column of the array of the plurality of unit regions.

20. The light-emitting module of claim 2 , further comprising a plurality of lens structures provided in the second main surface of the lightguide plate, each of the plurality of lens structures being located so as to correspond to one of the plurality of unit regions.

Assignees

• Nichia Corp

Inventors

• Kasai Daisuke

Classifications

• H10W90/00 Primary

  Package configurations · CPC title

• G02F1/133605

  including specially adapted reflectors · CPC title

• G02F1/133611

  including means for improving the brightness uniformity · CPC title

• G02F1/133603

  with LEDs · CPC title

• H01L25/13 Primary

  Electricity · mapped topic