Electroluminescent lamp designs

• US 6,054,809 A
• Filed: 08/13/1997
• Issued: 04/25/2000
• Est. Priority Date: 08/14/1996
• Status: Expired due to Fees

• Current Assignee: Illumagraphics LLC
• Original Assignee: Add-Vision, Inc.
• Inventors: Wilkinson, Matthew C., Feldman, Michael C., Haynes, Bryan D.
• Primary Examiner(s): Ramsey, Kenneth J.
• Application Number:
  US08/910,724
• Time in Patent Office: 986 Days
• Field of Search: 313/498, 313/505, 313/506, 313/509, 445/24
• US Class Current: 313/505
• CPC Class Codes: H05B 33/10 Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
• CPC Class Codes: H05B 33/12 Light sources with substantially two-dimensional radiating surfaces
• CPC Class Codes: H05B 33/26 characterised by the composition or arrangement of the conductive material used as an electrode
• CPC Class Codes: H10K 2102/3031 Two-side emission, e.g. transparent OLEDs [TOLED]
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 50/813 characterised by their shape
• CPC Class Codes: H10K 50/822 characterised by their shape
• CPC Class Codes: H10K 50/88 Terminals, e.g. bond pads

Abstract

Electroluminescent lamp designs and methods of fabricating electroluminescent lamps. Lamp designs provide laminar style lamps that include an electrically conductive layer with one or more openings therethrough separated by conductive elements. The openings preferably have a minimum edge to edge distance of less than about 0.005 inches and the conductive elements have a width of less than about 0.002 inches. Lamp designs also include "iso-planar" lamps that contain an electrically conductive layer with one or more channels separating the layer into two or more electrically conductive elements and an electroluminescent material disposed between the electrically conductive elements. The laminar style lamps and iso-planar lamps may be fabricated using printing techniques and the iso-planar lamps may also be fabricated using etching techniques. Both printed laminar and iso-planar lamps may be permanently reshaped using sheet forming techniques such as vacuum-forming or drape-forming.

Claims

1. An electroluminescent lamp produced by a process comprising the steps of:

(a) providing a first electrically conductive layer that includes one or more channels dividing the first electrically conductive layer into two or more electrically conductive elements; and

(b) depositing an electroluminescent material between or onto at least a portion of the electrically conductive elements;

wherein a portion of at least one of the conductive elements has a width of less than about 0.005 inches.

2. An electroluminescent lamp produced by the process described in claim 1, wherein the process further comprises the step of

(c) depositing a translucent or transparent electrically conductive material onto at least a portion of the electroluminescent material.

3. An electroluminescent lamp produced by the process described in claim 2, wherein step (c) comprises the steps of

(i) depositing a material comprising translucent or transparent electrically conductive particles suspended in a translucent or transparent curable matrix onto at least a portion of the electroluminescent material;

and

(ii) heating the translucent or transparent electrically conductive material to cure the matrix.

4. An electroluminescent lamp produced by the process described in claim 3, wherein the curable matrix comprises a material selected from the group consisting of polyesters, epoxies, and cellulose based resins.

5. An electroluminescent lamp produced by the process described in claim 3, wherein the translucent or transparent conductive particles comprise indium tin oxide.

6. An electroluminescent lamp produced by the process described in claim 1, wherein step (a) comprising the steps of:

(i) providing a conductive layer;

(ii) producing the first electrically conductive layer by dividing the conductive layer into two or more electrically conductive elements separated by one or more channels.

7. An electroluminescent lamp produced by the process described in claim 6, wherein in step (ii) the first electrically conductive layer is divided into two or more electrically conductive elements by chemically etching or heat stamping the one or more channels into the conductive layer.

8. An electroluminescent lamp produced by the process described in claim 7, wherein step (ii) includes the steps of:

(α

) coating the conductive layer with a photosensitive material having a solubility in a solvent;

(β

) exposing a portion of the photosensitive material to electromagnetic radiation thereby changing the solubility of the exposed portion of the photosensitive material relative to the solubility of the unexposed portion;

(γ

) dissolving the more soluble portion of the photosensitive material in the solvent to expose a portion of the conductive layer;

(δ

) removing the exposed portion of the conductive layer to form the one or more channels; and

(ε

) removing the less soluble portion of the photosensitive material from the conductive layer.

9. An electroluminescent lamp produced by the process described in claim 6, wherein step the conductive layer is made of a conductive material comprising copper.

10. An electroluminescent lamp produced by the process described in claim 1, wherein step (a) includes the steps of:

(i) providing a substrate; and

(ii) depositing the first electrically conductive layer onto the substrate.

11. An electroluminescent lamp produced by the process described in claim 10, wherein in step (ii) the first electrically conductive layer is deposited onto the substrate using printing techniques.

12. An electroluminescent lamp produced by the process described in claim 11, wherein the first electrically conductive layer is deposited onto the substrate by screen or off-set printing.

13. An electroluminescent lamp produced by the process described in claim 10, wherein step (ii) comprises the steps of:

(α

) depositing a removable material onto a portion of the substrate in a pattern that divides the substrate into at least two unconnected areas on which the removable material is not deposited;

(δ

) depositing a conductive material onto at least a portion of the areas of the substrate on which the removable material is not deposited; and

(γ

) removing at least a portion of the removable material.

14. An electroluminescent lamp produced by the process described in claim 13, wherein the removable material is a removable ink and is deposited onto the substrate using printing techniques.

15. An electroluminescent lamp produced by the process described in claim 14, wherein the removable material is deposited onto the substrate by off-set printing.

16. An electroluminescent lamp produced by the process described in claim 13, wherein the conductive material comprises conductive particles suspended in a matrix and the conductive material is deposited onto the substrate using printing techniques.

17. An electroluminescent lamp produced by the process described in claim 1, wherein the process further comprises the step of permanently reshaping the electroluminescent lamp.

18. An electroluminescent lamp produced by the process described in claim 17, wherein step (a) of claim 1 includes the steps of:

(i) providing a deformable substrate; and

(ii) depositing a curable electrically conductive ink onto the substrate to form the first electrically conductive layer; and

wherein the electroluminescent material comprises particles of electroluminescent material suspended in a curable matrix; and

wherein the process further comprises the steps of permanently reshaping the electroluminescent lamp before the curable electrically conductive ink and curable matrix are totally cured and subsequently curing the curable electrically conductive ink and curable matrix.

19. An electroluminescent lamp produced by the process described in claim 18, wherein the curable electrically conductive ink and curable matrix are cured by heating.

20. An electroluminescent lamp produced by the process described in claim 1, wherein the process further comprises the step of:

(c) providing one or more electrically conductive traces connected to two or more of the electrically conductive elements.

21. An electroluminescent lamp produced by the process described in claim 20, wherein steps (a) and (c) are performed simultaneously.

22. An electroluminescent lamp produced by the process described in claim 21, wherein steps (a) and (c) comprise the steps of:

(i) providing a conductive layer;

(ii) producing the first electrically conductive layer and the one or more electrically conductive traces by dividing the conductive layer into two or more electrically conductive elements separated by one or more channels and into one or more electrically conductive traces.

23. An electroluminescent lamp produced by the process described in claim 21, wherein steps (a) and (c) comprises the steps of:

(i) providing a substrate; and

(ii) depositing the first electrically conductive layer and the one or more electrically conductive traces onto the substrate.

24. An electroluminescent lamp produced by the process described in claim 23, wherein in step (ii) the first electrically conductive layer and the one or more electrically conductive traces are deposited onto the substrate using printing techniques.

25. An electroluminescent lamp produced by the process described in claim 1, wherein at least a portion of the surface of one of the conductive elements has a radius of curvature that is less than half of the width of the conductive element.

26. An electroluminescent lamp produced by the process described in claim 1, wherein the electrically conductive elements each comprise a plurality of elongated conductive elements and wherein at least a portion of the elongated conductive elements have a width of between about 0.001 inches and about 0.005 inches and wherein at least a portion of the one or more channels has a width of between about 0.001 inches and about 0.005 inches.

27. An electroluminescent lamp produced by the process described in claim 26, wherein at least a portion of the elongated conductive elements have a width of about 0.002 inches and wherein at least a portion of the one or more channels has a width of about 0.002 inches.

28. An electroluminescent lamp produced by the process described in claim 27, wherein at least a portion of the elongated conductive elements have a height of between about 0.001 inches and about 0.05 inches.

29. An electroluminescent lamp produced by the process described in claim 28, wherein at least a portion of the elongated conductive elements have a height of between about 0.005 inches and about 0.01 inches.

30. An electroluminescent lamp produced by a process comprising the steps of:

(a) providing a substrate;

(b) printing a first electrically conductive layer onto at least a portion of the substrate;

(c) depositing an electroluminescent material onto at least a portion of the first electrically conductive layer;

(d) printing a second electrically conductive layer onto at least a portion of the electroluminescent material;

wherein at least a portion of one of the electrically conductive layers includes one or more openings through the layer, the openings being separated by electrically conductive elements, wherein the openings have edges and at least one of the openings has a minimum edge to edge distance of less than about 0.005 inches.

31. An electroluminescent lamp produced by the process according to claim 30, wherein the shape of the openings is approximately square or hexagonal.

32. An electroluminescent lamp produced by a process comprising the steps of:

(a) providing a substrate;

(b) printing a first electrically conductive layer onto at least a portion of the substrate;

(c) depositing an electroluminescent material onto at least a portion of the first electrically conductive layer;

(d) printing a second electrically conductive layer onto at least a portion of the electroluminescent material;

wherein at least a portion of one of the electrically conductive layers includes one or more openings through the layer, the openings being separated by electrically conductive elements, and wherein at least a portion of one of the electrically conductive elements has a width of less than about 0.002 inches.

33. An electroluminescent lamp according to claim 32 wherein at least a portion of one of the electrically conductive elements has a width of less than about 0.005 inches.

34. An electroluminescent lamp produced by a process comprising the steps of:

(a) providing a substrate;

(b) printing a first electrically conductive layer onto at least a portion of the substrate;

(c) depositing an electroluminescent material onto at least a portion of the first electrically conductive layer;

(d) printing a second electrically conductive layer onto at least a portion of the electroluminescent material;

wherein at least a portion of one of the electrically conductive layers includes one or more openings through the layer, the openings being separated by electrically conductive elements, wherein the shape of the openings is approximately square and the length of a side of at least one of the openings is less than about 0.003 inches and at least a portion of one of the electrically conductive elements has a width of less than about 0.005 inches.

35. An electroluminescent lamp produced by a process comprising the steps of:

(a) providing a substrate;

(b) printing a first electrically conductive layer onto at least a portion of the substrate;

(c) depositing an electroluminescent material onto at least a portion of the first electrically conductive layer;

(d) printing a second electrically conductive layer onto at least a portion of the electroluminescent material;

wherein at least a portion of both of the electrically conductive layers includes one or more openings through the layer, the openings being separated by electrically conductive elements.

36. An electroluminescent lamp produced by a process comprising the steps of:

(a) providing a substrate;

(b) printing a first electrically conductive layer onto at least a portion of the substrate;

(c) depositing an electroluminescent material onto at least a portion of the first electrically conductive layer;

(d) printing a second electrically conductive layer onto at least a portion of the electroluminescent material;

wherein at least one of the electrically conductive layers is deposited in a pattern including a plurality of elongated electrically conductive elements separated by one or more channels and wherein at least a portion of one of the elongated electrically conductive elements has a width of less than about 0.005 inches.

37. An electroluminescent lamp produced by the process according to claim 36 wherein at least a portion of one of the elongated electrically conductive elements has a width of less than about 0.002 inches.

38. An electroluminescent lamp produced by a process comprising the steps of:

(a) providing a substrate;

(b) printing a first electrically conductive layer onto at least a portion of the substrate;

(c) depositing an electroluminescent material onto at least a portion of the first electrically conductive layer;

(d) printing a second electrically conductive layer onto at least a portion of the electroluminescent material;

wherein at least one of the electrically conductive layers is deposited in a pattern including a plurality of elongated electrically conductive elements separated by one or more channels and wherein at least a portion of one of the channels has a width of less than about 0.005 inches.

39. An electroluminescent lamp produced by the process according to claim 38 wherein at least a portion of one of the channels has a width of less than about 0.002 inches.

40. An electroluminescent lamp produced by a process comprising the steps of:

(a) providing a substrate;

(b) printing a first electrically conductive layer onto at least a portion of the substrate;

(c) depositing an electroluminescent material onto at least a portion of the first electrically conductive layer;

(d) printing a second electrically conductive layer onto at least a portion of the electroluminescent material;

wherein the substrate provided in step (a) includes a translucent or transparent electrically conductive material and in step (b) the first electrically conductive layer is printed onto at least a portion of the translucent or transparent electrically conductive material.

41. An electroluminescent lamp produced by the process according to claim 40, wherein the translucent or transparent electrically conductive material comprises translucent or transparent conducting particles suspended in a matrix.

42. An electroluminescent lamp produced by the process according to claim 41, wherein the translucent or transparent conducting particles comprise indium tin oxide.