Light emitting panel assemblies

• US 7,524,101 B2
• Filed: 06/30/2008
• Issued: 04/28/2009
• Est. Priority Date: 06/27/1995
• Status: Expired due to Fees

• Current Assignee: Rambus Delaware LLC (Rambus Inc.)
• Original Assignee: Solid State Opto Limited (Global Lighting Technologies Inc.)
• Inventors: Parker, Jeffery R.
• Primary Examiner(s): O'Shea; Sandra L.
• Assistant Examiner(s): Dunwiddie; Meghan K.
• Application Number:
  US12/164,508
• Publication Number:
  US 20080259640A1
• Time in Patent Office: 302 Days
• Field of Search: 362/26, 362/51, 362/602, 362/606, 362/612, 362/613
• US Class Current: 362/613
• CPC Class Codes: A61B 2090/309 using white LEDs
• CPC Class Codes: G02B 6/0018 Redirecting means on the surface of the light guide
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/0028 Light guide, e.g. taper
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0036 2-D arrangement of prisms, protrusions, indentations or roughened surfaces
• CPC Class Codes: G02B 6/0038 Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
• CPC Class Codes: G02B 6/0043 provided on the surface of the light guide
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: H01H 2219/062 Light conductor
• CPC Class Codes: H01H 2221/07 transparent
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

Edge lit light emitting assembly includes a panel member having a light input surface at one end of a greater width than thickness and an array of LEDs positioned in close proximity to the light input surface that emit light out of the side of the LEDs closest to the light input surface. At least one reflector around one or more of the LEDs collects light emitted by the LEDs and is shaped to reflect and focus the light at an acceptable angle for entering the light input surface, the focused light being shaped to have a greater cross-sectional width than height corresponding to the width and thickness of the light input surface.

Claims

1. An edge lit light emitting panel assembly comprising:

an optically conductive light emitting panel member having top and bottom surfaces and a greater cross-sectional width than thickness and a light input surface at least at one end of the panel member for receiving light, the light input surface having a greater width than thickness,

at least one light output region on at least one of the top and bottom surfaces, a predetermined pattern of deformities on or in the panel member configured to cause light to be emitted from the light output region,

an array of LEDs positioned in close proximity to the light input surface that emit light out of a side of the LEDs closest to the light input surface,

at least one reflector around one or more of the LEDs that collects light in more than one plane, the at least one reflector having a greater width than height, the width of the reflector being in the same plane as the width of the panel member and shaped to reflect and focus the light emitted from the LEDs at an acceptable angle for entering the light input surface, and

the focused-light being shaped to have a greater cross-sectional width than height corresponding to the width and thickness of the light input surface.

2. The assembly of claim 1 wherein the light input surface is generally rectangular in shape.

3. The assembly of claim 1 wherein the light input surface has faceted surfaces or multiple surfaces.

4. The assembly of claim 1 wherein the at least one reflector directs light rays emitted from the LEDs at relatively low angles, whereby the panel assembly may be made relatively thin.

5. The assembly of claim 4 wherein the panel member is less than 0.125 inches thick.

6. The assembly of claim 1 wherein the panel member is a plate, substrate or film.

7. The assembly of claim 1 wherein the panel member has a transition area.

8. The assembly of claim 7 wherein a portion of the reflector extends over a portion of the transition area.

9. The assembly of claim 8 wherein the transition area has at least one slot, cavity, opening or hole corresponding to the LEDs.

10. The assembly of claim 1 wherein each of the LEDs has at least one reflector.

11. The assembly of claim 1 wherein at least a portion of the light that is emitted by two or more of the LEDs is reflected by the same reflector.

12. The assembly of claim 1 wherein at least one of the LEDs is embedded, potted, bonded, molded, cast or attached to the reflector substantially to eliminate any air gaps or air interface surfaces between the LED and the reflector.

13. The assembly of claim 1 wherein at least one of the LEDs or reflector is embedded, potted, bonded, molded, cast or attached to the light input surface of the panel member substantially to eliminate any air gaps or air interface surfaces between the LED or reflector and the light input surface.

14. An edge lit light emitting panel assembly comprising:

an optically conductive light emitting panel member having top and bottom surfaces and a greater cross-sectional width than thickness, a light transition area that is an integral extension of at least one end of the panel member and a light input surface at least at one end for receiving light, the light input surface having a greater width than thickness, the panel member having at least one light output region on at least one of the top and bottom surfaces and a predetermined pattern of deformities configured to cause light to be emitted from the light output region,

an array of three or more LEDs aligned along a width of the light input surface, the LEDs being positioned in close proximity to the light input surface for emitting light out of a side of the LEDs in the direction of the light input surface,

at least one reflector shaped to reflect and focus at least a portion of the light emitted from the array of LEDs that impinges on at least the one reflector back through the light transition area and into the panel member,

the portion of the light emitted by the array of LEDs which is focused by the at least one reflector being shaped to have a greater cross-sectional width than height corresponding to the width and thickness of the light input surface.

15. The assembly of claim 14 wherein the panel member has multiple light transition areas.

16. The assembly of claim 14 wherein the transition area has at least one slot, cavity, opening or hole corresponding to the LEDs.

17. The assembly of claim 14 wherein the reflector has substantially parabolic shaped surfaces.

18. The assembly of claim 14 wherein the reflector has substantially elliptical shaped surfaces.

19. The assembly of claim 14 wherein the reflector has a greater width than height corresponding to the width and thickness of the light input surface.

20. An edge lit light emitting panel assembly comprising:

an optically conductive light emitting panel member having top and bottom surfaces and a greater cross-sectional width than thickness and at least one light input surface at least at one end for receiving light, the at least one light input surface having a greater width than thickness, the panel member having at least one light output region on at least one of the top and bottom surfaces and a predetermined pattern of deformities configured to cause light to be emitted from the light output region,

an array of LEDs aligned along the width of the panel member and positioned in close proximity to the at least one light input surface, the LEDs emitting light out of a side of the LEDs closest to the light input surface of the panel member,

at least one reflector around the LEDs that collects light in more than one plane, the reflector being shaped to reflect and focus the light emitted from the LEDs at an acceptable angle for entering the light input surface, the focused light being shaped to have a greater cross-sectional width than height corresponding to the width and thickness of the light input surface.

21. The assembly of claim 20 wherein the light input surface is generally rectangular in shape.

22. The assembly of claim 20 wherein the at least one reflector directs the light rays emitted from the LEDs at relatively low angles, whereby the panel assembly may be made relatively thin.

23. The assembly of claim 22 wherein the panel member is less than 0.125 inches thick.

24. The assembly of claim 20 wherein the panel member is a plate, substrate or film.

25. The assembly of claim 20 wherein the panel member has a transition area.

26. The assembly of claim 25 wherein a portion of the reflector extends over a portion of the transition area.

27. The assembly of claim 20 wherein each of the LEDs has at least one reflector.

28. The assembly of claim 20 wherein at least a portion of the light that is emitted by two or more of the LEDs is reflected by the same reflector.

29. The assembly of claim 20 wherein at least one of the LEDs is embedded, potted, bonded, molded, cast or attached to the reflector to eliminate any air gaps or air interface surfaces between the LED and the reflector.

30. The assembly of claim 20 wherein at least one of the LEDs or reflector is embedded, potted, bonded, molded, cast or attached to the light input surface of the panel member to eliminate any air gaps or air interface surfaces between the LED or reflector and the light input surface.