Light emitting panel assemblies

• US 7,226,196 B2
• Filed: 12/20/2002
• Issued: 06/05/2007
• Est. Priority Date: 06/27/1995
• Status: Expired due to Fees

• Current Assignee: Innovative Display Technologies LLC (Acacia Research Corporation)
• Original Assignee: Solid State Opto Limited (Global Lighting Technologies Inc.)
• Inventors: Parker, Jeffery R., Ezell, Robert M., Coghlan, Gregory A.
• Primary Examiner(s): Sember; Thomas M.
• Application Number:
  US10/324,880
• Publication Number:
  US 20030123245A1
• Time in Patent Office: 1,628 Days
• Field of Search: 362/339, 362/31, 362/331, 362/26, 362/330, 362/328, 362/603, 362/606, 362/612, 362/617, 362/618, 362/619, 362/620, 349/65
• US Class Current: 362/606
• CPC Class Codes: A61B 2090/309 using white LEDs
• CPC Class Codes: A61M 2021/0044 by the sight sense
• CPC Class Codes: A61M 21/02 for inducing sleep or relaxation, e.g. by direct nerve stimulation, hypnosis, analgesia for massage A61H; electrotherapy A61N, e.g. applying alternating or intermittent electric currents for producing anaesthesia A61N1/36021
• CPC Class Codes: A61N 2005/063 comprising light transmitting means, e.g. optical fibres
• CPC Class Codes: A61N 2005/0652 Arrays of diodes
• CPC Class Codes: A61N 5/0621 Hyperbilirubinemia, jaundice treatment
• CPC Class Codes: F21V 5/10 comprising photoluminescent material
• 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: H01H 2219/062 Light conductor
• CPC Class Codes: H01H 2221/07 transparent
• CPC Class Codes: Y10S 362/80 : Light emitting diode
• CPC Class Codes: Y10S 362/804 : Surgical or dental spotlight

Abstract

Light emitting panel assemblies include a light guide having a uniform or variable pattern of individual deformities of well defined shapes that are projections or depressions on or in one or more surface areas of the light guide. The deformities are quite small in relation to the width and length of the light guide. At least some of the deformities may have two or more surfaces that come together to form a ridge having a total length that is quite small in relation to the width and length of the light guide.

Claims

1. A light emitting panel assembly comprising a light guide having a greater cross-sectional width and length than thickness and at least one input edge for receiving light from a light source, and a pattern of individual deformities of well defined shape that are projections or depressions on or in at least one side of the light guide for producing a desired light output from the light guide, the deformities being quite small in relation to the width and length of the light guide, at least some of the deformities having only two surfaces that come together to form a ridge having a total length that is quite small in relation to the width and length of the light guide, one of the surfaces being flat and the other of the surfaces being curved in a transverse direction, the ridge of at least some of the deformities with only the two surfaces having opposite ends that intersect the light guide where the ridge ends.

2. A light emitting panel assembly comprising a light guide having a greater cross-sectional width and length than thickness and at least one input edge for receiving light from a light source, and a pattern of individual deformities of well defined shape that are projections or depressions on or in at least one side of the light guide for producing a desired light output from the light guide, the deformities being quite small in relation to the width and length of the light guide, at least some of the deformities having two or more surfaces that come together to form ridges having opposite end points, the ridges being in spaced relation from the one side of the light guide at least between the end points, each of the ridges having a total length that is quite small in relation to the width and length of the light guide, the opposite end points of at least some of the ridges intersecting the light guide where the ridges end, wherein at least some of the deformities only have two surfaces.

3. The assembly of claim 2 wherein the surfaces of at least some of the deformities are multi-segment, curved or flat.

4. The assembly of claim 2 wherein the ridges of at least some of the deformities extend at different angles relative to other of the deformities.

5. The assembly of claim 2 wherein at least some of the deformities vary in at least one of the following characteristics for controlling an output ray angle distribution or uniformity of the light emitted by the light guide to serve a particular application:

size, shape, placement, index of refraction, density, angle, depth, height and type.

6. The assembly of claim 2 wherein at least some of the deformities are random in at least one of the following characteristics for controlling an output ray angle distribution or uniformity of the light emitted by the light guide to suit a particular application:

size, shape, placement, index of refraction, density, angle, depth, height and type.

7. The assembly of claim 2 wherein the light guide has multiple layers.

8. The assembly of claim 2 wherein the light guide has a coating.

9. The assembly of claim 2 wherein additional deformities that are projections or depressions are on or in the other side of the light guide.

10. The assembly of claim 9 wherein the additional deformities are prismatic or lenticular.

11. The assembly of claim 9 wherein only the deformities on or in the one side of the light guide have ridges.

12. The assembly of claim 9 wherein at least some of the deformities on or in both sides of the light guide have ridges.

13. The assembly of claim 12 wherein the ridges of at least some of the deformities on different sides of the light guide are in different directions.

14. The assembly of claim 2 wherein the ridges of substantially all of the deformities are in the same direction.

15. The assembly of claim 2 wherein the light guide is in association with a liquid crystal display, and at least one layer of film is interposed between the liquid crystal display and the light guide.

16. The assembly of claim 15 wherein a pattern of individual deformities are on or in one side, the other side or both sides of the film.

17. The assembly of claim 2 wherein one of the surfaces of at least some of the deformities is flat and the other surface is curved in a transverse direction.

18. The assembly of claim 2 wherein both of the surfaces of at least some of the deformities are curved in a transverse direction.