Method for manufacturing an electroluminescent lamp

• US 20030003837A1
• Filed: 06/29/2001
• Published: 01/02/2003
• Est. Priority Date: 06/29/2001
• Status: Active Grant

• Current Assignee: Novatech Electro-Luminescent Incorporated
• Original Assignee: Novatech Electro-Luminescent Incorporated
• Inventors: Chan, Philip, Lau, James, Stevenson, William C.
• Granted Patent: US 6,607,413 B2
• Time in Patent Office: Days
• US Class Current: 445/24
• CPC Class Codes: H05B 33/04 Sealing arrangements , e.g. against humidity
• CPC Class Codes: H05B 33/10 Apparatus or processes specially adapted to the manufacture of electroluminescent light sources

Abstract

A method for manufacturing low cost electroluminescent (EL) lamps is disclosed. The method of the present invention includes the first step of die cutting, embossing or chemically etching the metal foil surface of a metal foil bonded flexible electrical insulation to simultaneously form one or more rear capacitive electrodes, electrical terminations, optical registration fiducial indicia, and a continuous carrier means that is then coupled to a precisely positioned indexing system. Next, the rear metal foil capacitive electrodes are coated with a capacitive dielectric layer precisely isolating the rear electrode form. In the third step, a layer of electroluminescent phosphor ink is applied to the rear capacitive electrodes to precisely form areas of illumination. In step four, a layer of light transmissive and electrically conductive ink is applied to cover the EL phosphor layer. Next, in step five a transparent polyester film or ultraviolet activated dielectric coating is applied to the entire surface of the lamp.

Claims

1. A method for manufacturing an electroluminescent lamp, said method comprising the following steps of:

forming a capacitive electrode from a metal foil by embossing said metal foil onto an insulating flexible plastic film;

forming electrical distribution pathways connected to said capacitive electrode from a metal foil by embossing said metal foil onto an insulating flexible plastic film;

forming electrical terminations that connect to said electrical distribution pathways from a metal foil by embossing said metal foil onto an insulating flexible plastic film;

forming a positioning optical registration indicia from a metal foil by embossing said metal foil onto an insulating flexible plastic film;

applying said insulating flexible plastic film to an optically registered indexing system, said optically registered indexing system to use said optical registration indicia to precisely position said insulating flexible plastic film for further electroluminescent lamp construction processing;

applying a layer of capacitive dielectric to said metal foil capacitive electrode, said capacitive dielectric for electrically isolating said capacitive electrode;

applying a layer of electroluminescent phosphor to said capacitive dielectric layer, said electroluminescent phosphor layer precisely defines an area of illumination;

applying a light transmissive electrically conductive layer to said layer of electroluminescent phosphor, said light transmissive electrically conductive layer having a surface; and

applying a light transmissive insulating coating to the surface of said light transmissive electrically conductive layer.

2. The method of claim 1 wherein said metal foil is die cut to form said capacitive electrode.

3. The method of claim 1 wherein said metal foil is chemically etched to form said capacitive electrode.

4. The method of claim 1 wherein said metal foil is laser cut to form said capacitive electrode.

5. The method of claim 1 wherein said capacitive electrode is formed from a layer of electrically conductive ink.

6. The method of claim 1 wherein said capacitive electrode is formed from a layer of deposited metal.

7. The method of claim 1 wherein said metal foil is die cut to form said electrical distribution pathways.

8. The method of claim 1 wherein said metal foil is chemically etched to form said electrical distribution pathways.

9. The method of claim 1 wherein said metal foil is laser cut to form said electrical distribution pathways.

10. The method of claim 1 wherein said electrical distribution pathways is formed from a layer of electrically conductive ink.

11. The method of claim 1 wherein said electrical distribution pathways is formed from a layer of deposited metal.

12. The method of claim 1 wherein said metal foil is die cut to form said electrical terminations.

13. The method of claim 1 wherein said metal foil is chemically etched to form said electrical terminations.

14. The method of claim 1 wherein said metal foil is laser cut to form said electrical terminations.

15. The method of claim 1 wherein said electrical terminations is formed from a layer of electrically conductive ink.

16. The method of claim 1 wherein said electrical terminations is formed from a layer of deposited metal.

17. The method of claim 1 wherein said metal foil is die cut to form said positioning optical registration indicia.

18. The method of claim 1 wherein said metal foil is chemically etched to form said positioning optical registration indicia.

19. The method of claim 1 wherein said metal foil is laser cut to form said positioning optical registration indicia.

20. The method of claim 1 wherein said positioning optical registration indicia is an opaque ink layer.

21. The method of claim 1 wherein said positioning optical registration indicia is a reflective ink layer.

22. The method of claim 1 wherein said positioning optical registration indicia is a layer of deposited metal.

23. The method of claim 1 wherein said capacitive dielectric layer is a plastic film.

24. The method of claim 1 wherein said capacitive dielectric layer is an ink.

25. The method of claim 1 wherein said capacitive dielectric layer is applied via plasma spray.

26. The method of claim 1 wherein said electroluminescent phosphor layer is an electroluminescent phosphor particle imbued plastic film.

27. The method of claim 1 wherein said electroluminescent phosphor layer is an electroluminescent phosphor particle imbued ink.

28. The method of claim 1 wherein said electroluminescent phosphor layer is applied via plasma spray.

29. The method of claim 1 wherein said light transmissive electrically conductive layer is a conductive metal oxide coated plastic film.

30. The method of claim 1 wherein said light transmissive electrically conductive layer is a conductive ink containing metal oxide.

31. The method of claim 1 wherein said light transmissive electrically conductive layer is a sputter coated layer containing metal oxide.

32. The method of claim 1 wherein said light transmissive electrically conductive layer is a plasma spray coated metal oxide.

33. The method of claim 1 wherein said light transmissive electrically conductive layer is a conductive organic polymer comprised of PEDOT (Poly-3,4-Ethyelenedioxithiophene).

35. The method of claim 34 wherein said metal foil is die cut to form said capacitive electrode.

36. The method of claim 34 wherein said metal foil is chemically etched to form said capacitive electrode.

37. The method of claim 34 wherein said metal foil is laser cut to form said capacitive electrode.

38. The method of claim 34 wherein said capacitive electrode is a layer of electrically conductive ink.

39. The method of claim 34 wherein said capacitive electrode is a layer of deposited metal.

40. The method of claim 34 wherein said metal foil is die cut to form said electrical distribution pathways.

41. The method of claim 34 wherein said metal foil is chemically etched to form said electrical distribution pathways.

42. The method of claim 34 wherein said metal foil is laser cut to form said electrical distribution pathways.

43. The method of claim 34 wherein said electrical distribution pathways is a layer of electrically conductive ink.

44. The method of claim 34 wherein said electrical distribution pathways is a layer of deposited metal.

45. The method of claim 34 wherein said metal foil is die cut to form said electrical terminations.

46. The method of claim 34 wherein said metal foil is chemically etched to form said electrical terminations.

47. The method of claim 34 wherein said metal foil is laser cut to form said.

48. The method of claim 34 wherein said electrical terminations is a layer of deposited metal.

49. The method of claim 34 wherein said metal foil is die cut to form said positioning optical registration indicia.

50. The method of claim 34 wherein said metal foil is chemically etched to form said positioning optical registration indicia.

51. The method of claim 34 wherein said metal foil is laser cut to form said positioning optical registration indicia.

52. The method of claim 34 wherein said positioning optical registration indicia is an opaque ink layer.

53. The method of claim 34 wherein said positioning optical registration indicia is a reflective ink layer.

54. The method of claim 34 wherein said optical registration indicia pathways is a layer of deposited metal.

55. The method of claim 34 wherein said capacitive dielectric layer is a plastic film.

56. The method of claim 34 wherein said capacitive dielectric layer is an ink.

57. The method of claim 34 wherein said capacitive dielectric layer is applied via plasma spray.

58. The method of claim 34 wherein said electroluminescent phosphor layer is an electroluminescent phosphor imbued plastic film.

59. The method of claim 34 wherein said electroluminescent phosphor layer is an electroluminescent phosphor imbued ink.

60. The method of claim 34 wherein said electroluminescent phosphor layer is applied via plasma spray.

61. The method of claim 34 wherein said light transmissive electrically conductive layer is a conductive metal oxide coated plastic film.

62. The method of claim 34 wherein said light transmissive electrically conductive layer is a conductive ink containing metal oxide.

63. The method of claim 34 wherein said light transmissive electrically conductive layer is a sputter coated metal oxide.

64. The method of claim 34 wherein said light transmissive electrically conductive layer is a plasma spray coated metal oxide.

65. The method of claim 34 wherein said light transmissive electrically conductive layer is a conductive organic polymer comprised of PEDOT (Poly-3,4-Ethyelenedioxithiophene).

34. A method for manufacturing an electroluminescent lamp, said method comprising the following steps of:

forming a capacitive electrode from a metal foil by embossing said metal foil onto an insulating paper core stock;

forming electrical distribution pathways connected to said capacitive electrode from a metal foil by embossing said metal foil onto an insulating paper core stock;

forming electrical terminations that connect to said electrical distribution pathways from a metal foil by embossing said metal foil onto an insulating paper core stock;

forming a positioning optical registration indicia from a metal foil by embossing said metal foil onto an insulating paper core stock;

applying said insulating flexible plastic film to an optically registered indexing system, said optically registered indexing system to use said optical registration indicia to precisely position said insulating paper core stock for further electroluminescent lamp construction processing;

applying a layer of capacitive dielectric to said metal foil capacitive electrode, said capacitive dielectric for electrically isolating said capacitive electrode;

applying a layer of electroluminescent phosphor to said capacitive dielectric layer, said electroluminescent phosphor layer for precisely defining an area of illumination;

applying a light transmissive electrically conductive layer to said layer of electroluminescent phosphor; and

applying a light transmissive insulating coating to a surface of said light transmissive electrically conductive layer.