DISPLAY DEVICE, BACKLIGHT UNIT, LIGHT EMITTING MODULE AND LENS

• US 20190331315A1
• Filed: 07/08/2019
• Published: 10/31/2019
• Est. Priority Date: 02/28/2017
• Status: Active Grant

• Current Assignee: Seoul Semiconductor Co., Ltd.
• Original Assignee: Seoul Semiconductor Co., Ltd.
• Inventors: Kim, Eun Ju, Park, Jae Eun
• Granted Patent: US 11,199,307 B2
• Time in Patent Office: Days
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 19/0066 in the form of an LED array
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 33/58 Optical field-shaping elements

Abstract

A lens including a light entering part having a concave shape in a lower region of the lens, and on which light emitted from a light emitting device is to be incident, and a light exiting part through which the incident light is emitted to the outside, in which each of the light entering part and the light exiting part has a major axis and a minor axis in plan view, and the major axis of the light entering part is orthogonal to the major axis of the light exiting part, and the light entering part includes a light incident vertical surface extending from a lower surface of the lens and a light incident inclined surface extending upward from the light incident vertical surface

Claims

1. A lens, comprising:

a light entering part having a concave shape in a lower region of the lens, and on which light emitted from a light emitting device is to be incident; and

a light exiting part through which the incident light is emitted to the outside,

wherein each of the light entering part and the light exiting part has a major axis and a minor axis in plan view, and the major axis of the light entering part is orthogonal to the major axis of the light exiting part, and

wherein the light entering part comprises a light incident vertical surface extending from a lower surface of the lens and a light incident inclined surface extending upward from the light incident vertical surface.

2. The lens of claim 1, wherein the lower surface further comprises a protruding part with a predetermined curvature to surround the light entering part.

3. The lens of claim 2, wherein an inner surface of the light entering comprises a light incident vertical surface extending from the protruding part, and a light incident inclined surface extending from the light incident vertical surface.

4. The lens of claim 2, wherein the lens further comprises a plurality of legs coupled to the lower surface of the lens, and the plurality of legs is disposed outside of the protruding part.

5. The lens of claim 1, wherein the lens further comprises a flange connecting the light exiting part and the lower surface of the lens.

6. The lens of claim 5, wherein the thickness of the flange is greater at a major axis of the light exiting part than at a minor axis of the light exiting part.

7. The lens of claim 6, wherein a shortest distance from one end of the light exiting part of the lens at the major axis thereof to one end of the flange at the major axis of the flange is different from a shortest distance from one end of the light exiting part of the lens at the minor axis thereof to one end of the flange at the minor axis of the flange.

8. A light emitting module, comprising:

a substrate;

a plurality of light emitting devices disposed on the substrate; and

a lens disposed over at least one of the plurality of light emitting devices to spread light emitted from the light emitting devices,

wherein the lens comprises a light entering part on which light emitted from the light emitting device is incident and a light exiting part through which the incident light is emitted to the outside,

wherein each of the light entering part and the light exiting part has a major axis and a minor axis in plan view, and the major axis of the light entering part is orthogonal to the major axis of the light exiting part, and

wherein the light entering part comprises a light incident vertical surface extending from a lower surface of the lens and a light incident inclined surface extending upward from the light incident vertical surface.

9. The light emitting module of claim 8, wherein:

the substrate has a predetermined length; and

the lens is arranged so that the major axis of the light exiting part is perpendicular to the longitudinal direction of the substrate.

10. The light emitting module of claim 8, wherein:

the substrate has a predetermined length; and

a width of the light entering part in the minor axis direction is less than a width of the substrate.

11. The light emitting module of claim 8, wherein the lens further comprises a plurality of legs arranged in the major axis direction.

12. The light emitting module of claim 8, wherein the lens further comprises a flange connecting the light exiting part and the lower surface of the lens.

13. The light emitting module of claim 12, wherein the thickness of the flange is greater at a major axis of the light exiting part than that at a minor axis of the light exiting part.

14. The light emitting module of claim 12, wherein a shortest distance from one end of the light exiting part of the lens at the major axis thereof to one end of the flange at the major axis of the flange is different from a shortest distance from one end of the light exiting part of the lens at the minor axis thereof to one end of the flange at the minor axis of the flange.