Compact LED package with reduced field angle

• US 20060285332A1
• Filed: 06/15/2005
• Published: 12/21/2006
• Est. Priority Date: 06/15/2005
• Status: Abandoned Application

• Current Assignee: Avago Technologies ECBU IP Singapore Pte Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies ECBU IP Singapore Pte Limited (Broadcom, Inc.)
• Inventors: Chua, Bee Yin Janet, Mok, Thye Linn, Chew, Gim Eng, Helbing, Rene P., Ng, Kee Yean, Goon, Wooi Kin
• Application Number:
  US11/153,706
• Publication Number:
  US 20060285332A1
• Time in Patent Office: Days
• US Class Current: 362/327
• CPC Class Codes: G02B 5/045 Prism arrays
• CPC Class Codes: G02B 6/4206 Optical features G02B6/4207, G02B6/421 take precedence
• CPC Class Codes: H01L 33/58 Optical field-shaping elements

Abstract

A light emitting diode system includes a housing including a light emission opening and a light emitting diode disposed within the housing. A first film layer covers the light emission opening and includes a uniaxial collimating film configured to direct light from the light emitting diode along a first axis.

Claims

1. A light emitting diode system comprising:

a housing including a light emission opening;

an light emitting diode disposed within the housing;

a first film layer disposed across at least a portion of the light emission opening, the first film layer including uniaxial collimating film configured to direct light from the light emitting diode

2. The system of claim 1, wherein the first film layer is configured to direct light from the light emitting diode along a first axis and further comprising:

a second film layer disposed on the first film layer, the second film layer including uniaxial collimating film configured to direct light from the light emitting diode along a second axis offset from the first axis.

3. The system of claim 1 wherein the housing includes a sloped reflector.

4. The system of claim 3 wherein the sloped reflector includes a bottom and a top, and wherein the radius of the bottom of the sloped reflector is smaller than the radius of the top of the sloped reflector.

5. The system of claim 3 wherein the sloped reflector comprises a mirror.

6. The system of claim 1 wherein the light emitting diode is disposed upon a mirror-finish layer attached to the housing.

7. The system of claim 6 wherein the mirror-finish layer includes a grooved surface configured to direct incoming light toward the first and second film layers.

8. The system of claim 1 wherein the uniaxial collimating film comprises a grooved surface.

9. The system of claim 1 wherein the uniaxial collimating film is configured to concentrate approximately 40 to approximately 70 percent of light generated by the light emitting diode to a center.

10. The system of claim 1 wherein the uniaxial collimating film resists deforming on exposure to environmental factors.

11. The system of claim 1 further comprising at least one of a liner and a light guide to diffuse light rays.

12. A method of collimating light, the method comprising:

receiving light in a first collimating layer;

directing a first portion of the received light through a second collimating layer along a first axis; and

directing a second portion of light through the second collimating layer along a second axis offset from the first axis.

13. The method of claim 12 wherein the light is generated by a light emitting diode package, and wherein the first portion of the received light is directed through the second collimating layer along a first axis, and wherein the second portion of light is directed through the second collimating layer along a second axis offset from the first axis.

14. The method of claim 12 further comprising directing a third portion of received light toward a reflective surface of the housing.

15. The method of claim 12 further comprising reflecting light from a mirror-surface layer toward the first and second collimating layers.

16. The method of claim 12 further comprising diffusing the directed light with at least one of a liner and a light guide.

17. The method of claim 12 wherein receiving light in a first collimating layer comprises generating light, and wherein directing a first portion of the received light comprises transmitting the received light when the received light has a predetermined angle, and wherein directing the second portion of the received light comprises reflecting the received light when the received light does not have the predetermined angle.

18. A system for collimating light, the system comprising:

means for receiving light in a first collimating layer;

means for directing a first portion of the received light through a second collimating layer along a first axis; and

means for directing a second portion of light through the second collimating layer along a second axis offset from the first axis.

19. The system of claim 18 further comprising means for diffusing light.

20. The system of claim 18 wherein means for directing a first portion of the received light through a second collimating layer comprises means for directing a first portion of the received light through a second collimating layer along a first axis and wherein means for directing a second portion of light through the second collimating layer comprises means for directing a second portion of light through the second collimating layer along a second axis offset from the first axis.