Light emitting panel assemblies

• US 9,625,633 B2
• Filed: 07/08/2014
• Issued: 04/18/2017
• Est. Priority Date: 06/23/2003
• Status: Expired due to Fees

• Current Assignee: Rambus Delaware LLC (Rambus Inc.)
• Original Assignee: Rambus Delaware LLC (Rambus Inc.)
• Inventors: McCollum, Timothy A., Parker, Jeffery R., Ezell, Robert M.
• Primary Examiner(s): Sember, Thomas M
• Application Number:
  US14/326,169
• Publication Number:
  US 20150003112A1
• Time in Patent Office: 1,015 Days
• CPC Class Codes: A61B 2090/309 using white LEDs
• CPC Class Codes: G02B 6/0013 Means for improving the coupling-in of light from the light source into the light guide coupling light into light guides in general G02B6/42
• CPC Class Codes: G02B 6/0018 Redirecting means on the surface of the light guide
• CPC Class Codes: G02B 6/002 by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
• 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 6/006 to produce indicia, symbols, texts or the like
• CPC Class Codes: G02B 6/0061 to provide homogeneous light output intensity
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: G09F 13/18 Edge-illuminated signs
• CPC Class Codes: G09F 2013/1804 Achieving homogeneous illumination
• CPC Class Codes: H01H 2219/062 Light conductor
• CPC Class Codes: H01H 2221/07 transparent
• CPC Class Codes: Y10S 362/812 Signs

Abstract

An optical assembly comprises light sources and a light emitting panel member having an input edge to which each of the light sources is optically coupled at a different location along the input edge. Different sets of individual optical deformities on or in at least one of the sides of the panel member each have at least one surface that is shaped or oriented to extract light propagating in the same direction through the panel member in different directions for viewing from different angles through one of the sides of the panel member.

Claims

1. An optical assembly comprising:

a light emitting panel member having opposite sides and at least one input edge for receiving light from at least one light source; and

a pattern of individual optical deformities on or in at least one of the sides for producing a light output distribution from a light emitting surface area of the panel member, the individual optical deformities being varied within the pattern, the pattern including different sets of the optical deformities in respective regions of the light emitting surface,

a first set of the optical deformities each having at least one surface that is shaped or oriented to extract light propagating through the panel member in an output ray angle distribution,

a second set of the optical deformities each having at least one surface that is shaped or oriented to extract light propagating through the panel member in a different output ray angle distribution than the first set.

2. The assembly of claim 1, wherein the light output distribution from the multiple regions of the light emitting surface area varies in intensity.

3. The assembly of claim 1, wherein the multiple regions of the light emitting surface area vary in surface area.

4. The assembly of claim 1, wherein the at least one light source is a light emitting diode.

5. The assembly of claim 1, wherein at least some of the optical deformities are random.

6. The assembly of claim 1, wherein the optical deformities are quite small in relation to a length and width of the panel member.

7. The assembly of claim 1, wherein the at least one surface of the different sets of the optical deformities is shaped or oriented to direct light from the multiple regions of the light emitting surface area for viewing at different angles.

8. The assembly of claim 1, wherein the different sets of optical deformities cause different intensities in the light output distribution from the multiple regions of the light emitting surface area.

9. The assembly of claim 1, wherein the at least one light source is a colored light source.

10. The assembly of claim 1, wherein the at least one light input edge receives light from a plurality of light sources.

11. The assembly of claim 10, wherein the light sources are different colored light sources.

12. The assembly of claim 11, wherein the different colored light sources are different colored light emitting diodes.

13. The assembly of claim 12, wherein the different colored light sources are flashed to produce different colored light output distributions.

14. The assembly of claim 1, wherein the panel member has at least two input edges for receiving light from different light sources.

15. The assembly of claim 14, wherein the input edges receive light from different colored light sources, and at least some of the optical deformities of the different sets within the pattern are shaped or oriented preferentially to cause the different colored light received by the different input edges to create at least one multi-colored light output distribution.

16. The assembly of claim 1 further comprising additional optical deformities on or in the other side of the panel member for generally emitting light in a different direction, such that different light output distributions are seen when the panel member is viewed from different angles.

17. An optical assembly comprising:

a light emitting panel member having opposite sides and at least one input edge for receiving light from at least one light source; and

a pattern of individual optical deformities on or in at least one of the sides for producing a light output distribution from a light emitting surface area of the panel member, the individual optical deformities being varied within the pattern,

different sets of the optical deformities within the pattern each having at least one surface that is shaped or oriented to extract light propagating through the panel member in respective different directions from multiple regions of the light emitting surface area of the panel member

wherein the optical deformities of the different sets within the pattern are varied to obtain a multi-intensity light output distribution. the panel member is viewed from different angles.