Member for controlling luminous flux, method for fabricating the member, and display device having the member

Patent metadata

Field	Value
Publication number	US-10088127-B2
Application number	US-201214404503-A
Country	US
Kind code	B2
Filing date	Dec 14, 2012
Priority date	May 31, 2012
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

A member for controlling luminous flux according to an exemplary embodiment of the present invention includes an optical path changing unit embedded in a matrix and including scattering particles scattering incident light, and an optical direction adjustment unit including a coupling surface attached to the optical path changing unit to receive the light scattered from the optical path changing unit, and a refractive surface refracting the received light and emitting the refracted light, whereby an optical diffusion performance of the member for controlling luminous flux according to an exemplary embodiment of the present invention can enhance an optical diffusion performance.

First claim

The invention claimed is:

1. A member for controlling luminous flux, the member comprising:
a refractive unit having a half-torus shape; and
a reflective unit partially or totally inserted into the refractive unit, wherein the refractive unit includes:
an incident surface receiving light from a light source;
a contact surface directly brought into contact with the reflective unit; and
a refractive surface extended from the contact surface, wherein the reflective unit is arranged opposite to the incident surface, and wherein a width of the reflective unit is equal to or less than a width of the light source.

2. The member for controlling luminous flux of claim 1 , wherein the reflective unit includes a reflective surface reflecting the light from the incident surface.

3. The member for controlling luminous flux of claim 2 , wherein the reflective surface includes a curved surface.

4. The member for controlling luminous flux of claim 1 , wherein the reflective unit includes a spherical surface.

5. The member for controlling luminous flux of claim 1 , wherein the reflective unit takes a shape of a horn or a frustum.

6. The member for controlling luminous flux of claim 5 , wherein the reflective unit faces the incident surface.

7. The member for controlling luminous flux of claim 1 , wherein the reflective unit takes a shape of a sphere.

8. The member for controlling luminous flux of claim 1 , wherein the refractive unit covers ⅗ to 99/100 of an outside surface of the reflective unit.

9. The member for controlling luminous flux of claim 1 , wherein a portion of a top surface of the reflective unit is exposed outward from the refractive unit.

10. A display device, the device comprising:
a light source;
a luminous flux control member receiving light from the light source; and
a display panel receiving light from the luminous flux control member, wherein the luminous flux control member includes:
a refractive unit having a half-torus shape and configured to receive the light from the light source; and
a reflective unit partially or totally inserted into the refractive unit to reflect the light from the light source, wherein the reflective unit faces an incident surface of the refractive unit, and wherein the refractive unit includes an incident surface receiving light, a contact surface directly brought into contact with the reflective unit, and a refractive surface extended from the contact surface, and wherein a width of the reflective unit is equal to or less than a width of the light source.

11. The display device of claim 10 , wherein the reflective unit is arranged on an optical axis of the light source.

12. The display device of claim 10 , further comprising a driving substrate electrically connected to the light source, and the luminous flux control member is brought into close contact with the light source and the driving substrate.

13. The display device of claim 10 , wherein the reflective unit takes a shape of a particle.

14. A method for fabricating the luminous flux control member of claim 10 , the method comprising:
arranging the reflective unit inside a mold; and
arranging a transparent resin inside the mold to partially or totally cover the reflective unit, wherein the reflective unit is temporarily fixed inside the mold.

15. The method of claim 14 , further comprising providing a driving substrate and a light source arranged on the driving substrate, wherein the transparent resin is brought into close contact with the driving substrate and the light source.

Assignees

• Lg Innotek Co Ltd

Inventors

• Lee Gi Seok
• Seo Eun Sung
• Choi Hyun Ho
• Lee Chang Hyuck
• Kim Ki Cheol

Classifications

• G02F1/133603 Primary

  with LEDs · CPC title

• G02B19/0014 Primary

  at least one surface having optical power · CPC title

• G02B19/0061

  the light source comprising a LED · CPC title

• F21V7/0008

  providing for indirect lighting · CPC title

• F21V7/09

  with a combination of different curvatures · CPC title