Light emitting panel assemblies

• US 5,876,107 A
• Filed: 01/02/1997
• Issued: 03/02/1999
• Est. Priority Date: 06/27/1995
• Status: Expired due to Term

• Current Assignee: Innovative Display Technologies LLC (Acacia Research Corporation)
• Original Assignee: Lumitex Incorporated
• Inventors: Kelsch, Daniel N., Parker, Jeffery R., Miller, Mark D.
• Primary Examiner(s): Sember, Thomas M.
• Application Number:
  US08/778,734
• Time in Patent Office: 789 Days
• Field of Search: 362/26, 362/27, 362/31, 362/235, 362/249, 362/310, 362/311, 362/800, 362/231, 362/230
• US Class Current: 362/600
• 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

Light emitting panel assemblies include light emitting panel members and one or more light sources positioned/embedded in a light transition area, which increases the efficiency of light entering the panel members along the light input area to be emitted from one or more light emitting surfaces along the length of the panel members. Light may be reflected or refracted by a surface which changes the path of a portion of light such that it enters the input area of the panel member at a more acceptable angle. A uniform light output distribution may be produced by utilizing a pattern of light extracting deformities.

Claims

1. A light emitting panel assembly comprising a light emitting panel member, a light transition area at one end of said panel member, a slot, cavity or opening in said light transition area, and a light source received within said slot, cavity or opening, said light source and said light transition area including mating elements for locating said light source in said slot, cavity or opening, said light source comprising a plurality of different colored LEDs which are selectively operable to produce a desired light output from said panel member.

2. The assembly of claim 1 wherein said slot, cavity or opening is in a back edge of said light transition area, said light source being slidably received into said slot, cavity or opening from said back edge.

3. The assembly of claim 1 wherein said light source has a snap fit in said slot, cavity or opening.

4. The assembly of claim 1 wherein said panel member is shaped to fit a particular application.

5. The assembly of claim 1 wherein said panel member is shaped to fit a particular dental or medical application.

6. The assembly of claim 1 wherein said panel member is three dimensionally curved.

7. The assembly of claim 1 wherein said panel member includes a structural support for other parts or components.

8. The assembly of claim 7 wherein said structural support comprises molded posts on said panel member.

9. The assembly of claim 1 wherein said panel member includes a structural support for an LCD.

10. The assembly of claim 1 wherein said panel member includes a structural support for a printed circuit board.

11. The assembly of claim 1 wherein said panel member is rectangular in cross section and is curved along its length to cause light to be emitted from said panel member to fit a particular application.

12. The assembly of claim 1 wherein said panel member is rectangular in cross section and is curved along its width to cause light to be emitted from said panel member to fit a particular application.

13. The assembly of claim 1 wherein said mating elements comprise tabs on said light source and correspondingly shaped recesses extending into said light transition area to a depth for locating said light source in said slot, cavity or opening in said light transition area when said tabs are fully seated in said recesses.

14. The assembly of claim 13 wherein said tabs extend substantially the full depth of said recesses.

15. The assembly of claim 13 wherein said light source includes two said tabs laterally spaced from each other, and said light transition area includes two said recesses having the same spacing as said tabs for receipt of said tabs in said recesses.

16. The assembly of claim 1 wherein said different colored LEDs are selectively operable to produce different colored light outputs from said panel member.

17. The assembly of claim 1 wherein said different colored LEDs are selectively operable to produce a substantially uniform light output from said panel member.

18. A light emitting panel assembly comprising a light emitting panel member, a light transition area at one end of said panel member, a slot, cavity or opening in said light transition area, and a light source received within said slot, cavity or opening, said light source and said light transition area including mating elements for locating said light source in said slot, cavity or opening, said mating elements comprising tabs on said light source and correspondingly shaped recesses extending into said light transition area to a depth for locating said light source in said slot, cavity or opening in said light transition area when said tabs are fully seated in said recesses, said light source being embedded, potted or bonded in said slot, cavity or opening in said light transition area so as to eliminate any air interface between said light source and said light transition area.