Optical lens and display device including the same

Patent metadata

Field	Value
Publication number	US-9971195-B2
Application number	US-201514982674-A
Country	US
Kind code	B2
Filing date	Dec 29, 2015
Priority date	Dec 29, 2014
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

An optical lens and a display device including the same are provided. An optical lens includes a first surface having a circular cross-sectional shape, a second surface opposite to the first surface, and a third surface configured to connect the first surface and the second surface. The third surface includes a straight surface extending from a boundary of the first surface and a first curved surface extending from the straight surface to the second surface. The straight surface and the first curved surface extending in a path between the first surface and the second surface. The second surface includes a concave recess recessing in a direction of the first surface and the concave recess includes a second curved surface. Light that has passed through the second concave surface changes a path as the light passes through the first curved surface such that light path can be effectively controlled.

First claim

What is claimed is:

1. An optical lens, comprising:
a first surface having a circular cross-sectional shape;
a second surface positioned lower than the first surface, the second surface including:
a bottom surface that is flat; and
a concave recess recessing toward the first surface from the bottom surface, the concave recess being laterally surrounded by the bottom surface; and
a third surface configured to connect the first surface and the second surface,

wherein the third surface includes:
a straight surface extending from a boundary of the first surface; and
a first curved surface that is bent and extended toward a center of the second surface from the straight surface, the first curved surface being convex outward,

wherein the straight surface and the first curved surface are extended in a path between the first surface and the second surface,
wherein the wherein the concave recess includes:
a first area obliquely extending toward an outer circumference of the bottom surface from a center of the concave recess, the center having a maximum depth toward the first surface;
a second area extending from the first area, the second area being parallel to the bottom surface; and
a third area extending from the second area to the bottom surface, the third area being concave outward, and

wherein a boundary between the straight surface and the first curved surface is convex outward.

2. The optical lens of claim 1 , wherein the straight surface is formed from a boundary of the first surface and the third surface, and the first curved surface is formed from an end portion of the straight surface to a boundary of the second surface.

3. The optical lens of claim 1 , wherein the third area includes a second curved surface that is concave outward.

4. The optical lens of claim 1 , wherein the first surface includes a concave surface recessing toward the second surface.

5. The optical lens of claim 4 , wherein the concave surface extends to a boundary of the first and third surfaces and has a maximum depth toward the second surface at a central point of the first surface.

6. The optical lens of claim 4 , wherein the concave recess forms a curved surface having a depth gradually decreasing from a central point of the first surface to a boundary of the first surface and the third surface.

7. The optical lens of claim 3 , wherein light that passes through the second curved surface changes a path as the light passes through the first curved surface.

8. The optical lens of claim 1 , wherein a first radius of the first surface is larger than a second radius of the second surface.

9. A display device, comprising:
a display panel;
an optical sheet positioned at a rear of the display panel;
a substrate positioned at a rear of the optical sheet; and
a light assembly on the substrate, the light assembly including a light source and a first optical lens,
wherein the light source provides the optical sheet with light,
wherein the first optical lens covers the light source,
wherein the first optical lens includes a first surface having a circular cross-sectional shape, a second surface opposite to the first surface, and a third surface configured to connect the first surface and the second surface,
wherein the second surface includes:
a bottom surface this is flat and faces the substrate; and
a concave recess recessing toward the first surface from the bottom surface, the concave recess being laterally surrounded by the bottom surface,

wherein the third surface includes a straight surface extended from a boundary of the first surface and a first curved surface bent and extended toward a center of the second surface from the straight surface,
wherein the straight surface and the first curved surface are extended in a path between the first surface and the second surface, and
wherein the first curved surface is convex outward,
wherein the concave recess includes:
a first area obliquely extending toward an outer circumference of the bottom surface from a center of the concave recess, the center having a maximum depth toward the first surface, and the first area obliquely facing the substrate;
a second area extending from the first area, the second area being parallel to the bottom surface; and
a third area extending from the second area to the bottom surface, the third area being concave outward and obliquely facing the substrate, and

wherein a boundary between the straight surface and the first curved surface is convex outward.

10. The display device of claim 9 , wherein the substrate comprises a plurality of substrates, each of the substrates extending in a horizontal direction and separated from each other in a vertical direction.

11. The display device of claim 9 , wherein the light assembly comprises a plurality of light assemblies.

12. The display device of claim 9 , wherein the light assembly comprises a plurality of light assemblies, at least one of the light assembly having a second optical lens different from the first optical lens.

13. The display device of claim 9 , wherein the straight surface is formed from a boundary of the first surface and the third surface, and the first curved surface is formed from an end portion of the straight surface to a boundary of the second surface.

14. The display device of claim 9 , wherein the third area includes a second curved surface that is concave outward.

15. The display device of claim 9 , wherein a boundary between the straight surface and the first curved surface is convex outward.

16. The display device of claim 9 , wherein a concave surface of the first surface extends to a boundary of the first and third surfaces and has a maximum depth toward the second surface at a central point of the first surface.

17. The display device of claim 9 , wherein the concave recess forms a curved surface having a depth gradually decreasing from a central point of the first surface to a boundary of the first surface and the third surface.

18. The display device of claim 14 , wherein light that passes through the second curved surface changes a path as the light passes through the first curved surface.

19. The display device of claim 9 , wherein a first radius of the first surface is larger than a second radius of the second surface.

Assignees

• Lg Electronics Inc

Inventors

• Han Jongho
• Lee Uihyung
• Joung Juyoung
• Kee Wondo

Classifications

• G02F1/133603

  with LEDs · CPC title

• G02F1/133606 Primary

  including a specially adapted diffusing, scattering or light controlling members · CPC title

• F21V5/045

  the lens having discontinuous faces, e.g. Fresnel lenses · CPC title

• G02B3/00 Primary

  Simple or compound lenses · CPC title

• G02B19/0061

  the light source comprising a LED · CPC title