Light emitting module, backlight unit including the module, and display apparatus including the unit

• US 10,067,381 B2
• Filed: 10/30/2015
• Issued: 09/04/2018
• Est. Priority Date: 11/07/2014
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Park, Sang Jun, Kang, Lee Im, Lee, Chang Hyuck
• Primary Examiner(s): Breval, Elmito
• Application Number:
  US14/928,051
• Publication Number:
  US 20160131329A1
• Time in Patent Office: 1,040 Days
• CPC Class Codes: G02B 3/0037 characterized by the distribution or form of lenses
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Abstract

A light emitting module is disclosed. The light emitting module includes a board, a plurality of light emitting device packages mounted on the board while being spaced apart from each other, and a plurality of lenses located at upper surfaces of the light emitting device packages in a contact fashion, wherein each of the lenses includes a curved surface expressed by a start point (SP), an end point (EP), and two adjustment points (AP1 and AP2) of a Bezier curve represented as follows. SP=(x, z), EP=(x, Z_E), AP1=(X_01, Z_01), AP2=(X_02, Z_02) where x indicates positions in a direction intersecting a light axis, z indicates positions in a direction parallel to the light axis, SP is fixed, and 0.5 mm≤Z_E≤0.78 mm, 1.62 mm≤X_01≤1.8 mm, 1.44 mm≤Z_01≤1.5 mm, 0.19 mm≤X_02≤0.25 mm, and 1.06 mm≤Z_02≤1.26 mm, or X_01 is 1.0 mm, Z_01 is 0.9 mm, X_02 is 0.2 mm, Z_02 is 0.1 mm, and Z_E is 1.2 mm.

Claims

1. A light emitting module, comprising:

a board;

a plurality of light emitting device packages mounted on the board while being spaced apart from each other; and

a plurality of lenses located at upper surfaces of the light emitting device packages in a contact fashion,

wherein each of the lenses comprises a curved surface expressed by a start point (SP), an end point (EP), and two adjustment points (AP1 and AP2) of a Bezier curve represented as follows;

SP=(x,z),EP=(x,Z_E),AP1=(X_01,Z_01),AP2=(X_02,Z_02)

(where x indicates positions in a direction intersecting a light axis, z indicates positions in a direction parallel to the light axis, SP is fixed, and

0.5 mm≤

Z_E≤

0.78 mm, 1.62 mm≤

X_01≤

1.8 mm, 1.44 mm≤

Z_01≤

1.5 mm, 0.19 mm≤

X_02≤

0.25 mm, and 1.06 mm≤

Z_02≤

1.26 mm, or

X_01 is 1.0 mm, Z_01 is 0.9 mm, X_02 is 0.2 mm, Z_02 is 0.1 mm, and Z_E is 1.2 mm).

2. The light emitting module according to claim 1, wherein x of the start point (SP) is 1.5 mm, and z of the start point (SP) is 0.

3. The light emitting module according to claim 1, wherein X_01 is 1.7 mm, Z_01 is 1.45 mm, X_02 is 0.2 mm, Z_02 is 1.1 mm, and Z_E is 0.6 mm.

4. The light emitting module according to claim 1, wherein the lenses have the same shape.

5. The light emitting module according to claim 1, wherein the lenses have different shapes.

6. The light emitting module according to claim 1, wherein at least one of the lenses has a hemispheric shape.

7. The light emitting module according to claim 6, wherein at least one of the lenses has a hemispheric shape with a recess formed at an upper part thereof.

8. The light emitting module according to claim 7, wherein the lens having the recess is symmetric with the light axis in a direction intersecting the light axis.

9. The light emitting module according to claim 7, wherein the recess is located on the light axis, and is concave toward a center of a corresponding one of the light emitting device packages.

10. The light emitting module according to claim 1, wherein at least one of the lenses has a truncated hemispheric shape.

11. The light emitting module according to claim 1, wherein the board has recesses defining lens areas, and each of the lenses is located in a corresponding one of the lens areas.

12. The light emitting module according to claim 1, wherein the light emitting device packages are arranged at the same interval, and the lenses have the same width.

13. The light emitting module according to claim 1, wherein the light emitting device packages are arranged at different intervals, and the lenses have different widths.

14. The light emitting module according to claim 1, wherein the lenses are arranged at the same interval.

15. The light emitting module according to claim 1, wherein the lenses are arranged at different intervals.

16. The light emitting module according to claim 1, wherein the lenses are arranged so as to surround the light emitting device packages.

17. The light emitting module according to claim 1, wherein lower surfaces of the lenses contact an upper surface of the board and upper surfaces of the light emitting device packages.

18. The light emitting module according to claim 1, wherein lower surfaces of the lenses are spaced apart from an upper surface of the board.

19. A backlight unit comprising:

a light emitting module according to claim 1;

a reflection unit located under the light emitting module; and

a diffusion unit located on the light emitting module.

20. A display apparatus comprising:

a backlight unit according to claim 19; and

a display panel located on the backlight unit.