US-12618542-B2 - Display device, backlight unit, light emitting module and lens

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 an outside of the lens, 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, 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, and the light incident vertical surface surrounds the light emitting device.

Inventors

• Eun Ju KIM
• Jae Eun Park

Assignees

• SEOUL SEMICONDUCTOR CO., LTD.

Dates

Publication Date

20260505

Application Date

20250219

Priority Date

20170228

Claims (20)

1. 1 . A light module, comprising: a substrate; a light emitting device disposed on the substrate; and a lens disposed over the light emitting device to spread light emitted from the light emitting device, the lens comprising: a light entering surface having a concave shape in a lower region of the lens, and on which the light emitted from the light emitting device is to be incident; a light exiting surface through which the incident light is emitted to an outside of the lens; a plurality of legs coupled to a lower surface of the lens; and a flange connecting the light exiting surface and the lower surface of the lens, wherein the light entering surface includes a light incident curved surface between the lower surface of the lens and the light exiting surface, wherein the flange protrudes further out than the light exiting surface, and wherein the lower surface of the lens includes a inclined region closer to an inner edge of the lower surface and includes a substantially planar region closer to an outer edge of the lower surface and the plurality of legs are disposed outside of the inclined region.
2. 2 . The light module of claim 1 , wherein the lens further includes a gate that protrudes outside of the flange.
3. 3 . The light module of claim 1 , wherein the inclined region has a spherical shape.
4. 4 . The light module of claim 3 , wherein a center of the light entering surface coincides with a center of the spherical shape.
5. 5 . The light module of claim 1 , wherein the flange has a substantially circular shape in a plan view.
6. 6 . The light module of claim 1 , wherein two of the plurality of legs are spaced apart by a first interval from each other, and other two of the plurality of legs are spaced apart from the two of the plurality of legs by a second interval.
7. 7 . The light module of claim 6 , wherein the two of the plurality of legs and the other two of the plurality of legs are spaced apart by a distance that is longer than the first and second intervals.
8. 8 . A light module, comprising: a substrate; a light emitting device disposed on the substrate; and a lens disposed over the light emitting device to spread light emitted from the light emitting device, the lens comprising: a light entering surface having a concave shape in a lower region of the lens, and on which the light emitted from the light emitting device is to be incident; a light exiting surface through which the incident light is emitted to an outside of the lens; a plurality of legs coupled to a lower surface of the lens; and a flange connecting the light exiting surface and the lower surface of the lens, wherein the light entering surface includes a light incident curved surface between the lower surface of the lens and the light exiting surface, wherein the flange protrudes further out than the light exiting surface, and wherein the lower surface of the lens includes a protrusion region closer to an inner edge of the lower surface and includes a substantially planar region closer to an outer edge of the lower surface, and the plurality of legs are disposed outside of the protrusion region.
9. 9 . The light module of claim 8 , wherein the lens further includes a gate that protrudes outside of the flange.
10. 10 . The light module of claim 8 , wherein the protrusion region has a spherical shape.
11. 11 . The light module of claim 10 , wherein a center of the light entering surface coincides with a center of the spherical shape.
12. 12 . The light module of claim 8 , wherein the flange has a substantially circular shape in a plan view.
13. 13 . The light module of claim 8 , wherein two of the plurality of legs are spaced apart by a first interval from each other, and other two of the plurality of legs are spaced apart from the two of the plurality of legs by a second interval.
14. 14 . The light module of claim 13 , wherein the two of the plurality of legs and the other two of the plurality of legs are spaced apart by a distance that is longer than the first and second intervals.
15. 15 . A light module, comprising: a substrate; a light emitting device disposed on the substrate; and a lens disposed over the light emitting device to spread light emitted from the light emitting device, the lens comprising: a light entering surface having a concave shape in a lower region of the lens, and on which the light emitted from the light emitting device is to be incident; a light exiting surface through which the incident light is emitted to an outside of the lens; a plurality of legs coupled to a lower surface of the lens; and a flange connecting the light exiting surface and the lower surface of the lens, wherein the light entering surface includes a light incident curved surface between the lower surface of the lens and the light exiting surface, wherein the flange protrudes further out than the light exiting surface, and wherein the lower surface of the lens includes a inclined region closer to an inner edge of the lower surface and includes a substantially planar region closer to an outer edge of the lower surface, and the plurality of legs are spaced apart from the inclined region.
16. 16 . The light module of claim 15 , wherein the lens further includes a gate that protrudes outside of the flange.
17. 17 . The light module of claim 15 , wherein the inclined region has a spherical shape.
18. 18 . The light module of claim 17 , wherein a center of the light entering surface coincides with a center of the spherical shape.
19. 19 . The light module of claim 15 , wherein two of the plurality of legs are spaced apart by a first interval from each other, and other two of the plurality of legs are spaced apart from the two of the plurality of legs by a second interval.
20. 20 . The light module of claim 19 , wherein the two of the plurality of legs and the other two of the plurality of legs are spaced apart by a distance that is longer than the first and second intervals.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of and claims benefit under 35 U.S.C. § 120 to U.S. application Ser. No. 18/339,782 filed Jun. 22, 2023, which is a continuation of and claims benefit under 35 U.S.C. § 120 to U.S. application Ser. No. 17/506,695 filed Oct. 21, 2021 (now U.S. Pat. No. 11,725,800 issued Aug. 15, 2023), which is a continuation of and claims benefit under 35 U.S.C. § 120 to U.S. application Ser. No. 16/504,338 filed Jul. 8, 2019 (now U.S. Pat. No. 11,199,307 issued Dec. 14, 2021), which is a Bypass Continuation of International Patent Application No. PCT/KR2018/002377 filed Feb. 27, 2018, and claims the benefit of priority under 35 U.S.C. § 119 from Korean Patent Application No. 10-2017-0026197 filed Feb. 28, 2017 and Korean Patent Application No. 10-2018-0020302 filed Feb. 21, 2018, the entire contents of each of which are incorporated herein by reference. BACKGROUND Field Exemplary embodiments of the invention relate generally to a display device, a backlight unit, a light emitting module, and a lens, and more specifically, to a display device, a backlight unit, a light emitting module, and a lens capable of specifying a light emission distribution emitted to the outside. Discussion of the Background A light emitting diode is an inorganic semiconductor device, which emits light generated by recombination of electrons and holes. In recent years, light emitting diodes have been widely used in various fields, such as display devices, vehicular lamps, general lighting, and the like. With various advantages, such as longer lifespan, lower power consumption, and more rapid response compared to conventional light sources, the light emitting diodes have been rapidly replacing existing light sources in the art. When using the light emitting diode for a display device or a general lighting, several to tens of light emitting diodes may be used. When using many light emitting diodes, optical interference between light emitting diodes should be minimized. Otherwise, interference of light emitted from each of the light emitting diodes may occur, which may generate shadows or partial hot spots. The above information disclosed in this Background section is only for understanding of the background of the inventive concepts, and, therefore, it may contain information that does not constitute prior art. SUMMARY A display device, a backlight unit, a light emitting module, and a lens constructed according to exemplary embodiments of the invention are capable of minimizing or at least suppressing optical interference between light emitting diodes. Additional features of the inventive concepts will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the inventive concepts. A light emitting module according to an exemplary embodiment includes a light emitting device, and a lens disposed on the light emitting device to spread light emitted from the light emitting device, in which the lens includes 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, each of the light entering part and the light exiting part has a major axis and a minor axis in plan view, 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. The lens may have a protruding part protruding from the lower surface of the lens with a predetermined curvature. The light entering part may be formed upwardly in a concave shape from the protruding part of the lens, and an inner surface of the concave shape may include a light incident vertical surface extending from the protruding part of the lens and a light incident inclined surface extending from the light incident vertical surface. The lens may further include a plurality of legs coupled to the lower surface of the lens to support the lens. The plurality of legs may be disposed outside of the protruding part. The lens may further include a flange connecting the light exiting part and the lower surface of the lens. A height of the light incident vertical surface may be less than a thickness of the flange. The thickness of the flange may be greater at a major axis of the light exiting part than that at a minor axis of the light exiting part. A shortest distance from the end of the light exiting part of the lens at the major axis thereof to the end of the flange at the major axis of the flange may be different from a shortest distance from the end of the light exiting part of the lens at the minor axis thereof to the end of the flange at the minor axis of the flange. A lens according to an exemplary embodiment includes a light enterin