Electrical interconnection of light-emitting fibers, and method therefor

• US 6,541,919 B1
• Filed: 10/27/2000
• Issued: 04/01/2003
• Est. Priority Date: 02/14/2000
• Status: Expired due to Term

• Current Assignee: Illumafinity, LLC (Ascend Innovation Management, LLC)
• Original Assignee: Sarnoff Corporation (SRI International, Inc.)
• Inventors: Kaganowicz, Grzegorz, Singh, Bawa, Roach, William R.
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): Vu, Jimmy T.
• Application Number:
  US09/698,913
• Time in Patent Office: 886 Days
• Field of Search: 315/169.1, 315/169.2, 315/169.3, 313/483, 313/498, 313/508, 313/503, 313/511, 313/512, 345/74, 345/94, 345/76
• US Class Current: 315/169.3
• CPC Class Codes: G09F 9/33 being semiconductor devices, e.g. diodes
• CPC Class Codes: H10K 50/182 OLED comprising a fiber structure
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 59/00 Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
• CPC Class Codes: H10K 59/82 Interconnections, e.g. terminals H10K59/131, H10K59/179 take precedence

Abstract

A number of light-emitting fibers in side-by-side array comprise a display. Each fiber includes a number of light-emitting elements disposed along the length of one surface of an optical fiber, such as an electro-luminescent material, e.g., an OLED material, disposed between hole injecting and electron injecting electrodes. Contacts on the top ones of the electrodes are connected by a conductor disposed transverse to the longitudinal direction of the fiber. The conductors are preferably deposited on the optical fibers by mask deposition, preferably utilizing masks adapted for contemporaneously depositing a metal conductor across a plurality of fibers. Electronic circuits having patterned conductors corresponding to the transverse conductors may be connected thereto by solder, conductive adhesive and the like.

Claims

1. An interconnection of plural light-emitting fibers comprising:

a plurality of lengths of a light-emitting fiber each having a plurality of light-emitting elements along a first surface thereof, each light-emitting element having at least one exposed contact;

wherein said plural light-emitting fibers are disposed side-by-side one another; and

at least one elongated electrical conductor substantially transverse to the lengths of said light-emitting fibers and disposed on the respective first surfaces thereof, wherein said at least one elongated conductor is in electrical connection with at least one of the exposed contacts on each of said plurality of light-emitting fibers.

2. The interconnection of claim 1 further comprising a material underlying said elongated electrical conductor for bridging at least part of a gap between adjacent ones of said plurality of light-emitting fibers, wherein said material includes one of an electrically insulating material and an electrically conductive material.

3. The interconnection of claim 2 further comprising an electronic circuit having at least one conductor positioned proximal said at least one elongated conductor and connected thereto at a plurality of locations, wherein at least one of the locations overlies said material.

4. The interconnection of claim 3 wherein the at least one conductor of said electronic circuit is connected to said at least one elongated conductor by one of solder, electrically conductive epoxy and silver filled epoxy.

5. The interconnection of claim 1 further comprising an electronic circuit having at least one conductor positioned proximal said at least one elongated conductor and connected thereto at a plurality of locations.

6. The interconnection of claim 1 wherein said at least one elongated electrical conductor is formed of a material selected from the group consisting of aluminum, gold, silver, copper, chromium, alloys thereof, and combinations thereof.

7. The interconnection of claim 1 wherein said at least one elongated electrical conductor is formed by one of deposition, evaporation, and sputtering of a metal and electrically bonding a strip of metal.

8. The interconnection of claim 1 wherein said light-emitting fiber comprises an optically transparent fiber having light-emitting elements thereon including one of an inorganic electro-luminescent material and an organic light-emitting material.

9. The interconnection of claim 8 wherein the optically-transparent fiber includes a material selected from the group consisting of glass, borosilicate glass, soda-lime glass, quartz, sapphire, plastic, polymethyl-methacrylate (PMMA), polycarbonate, acrylic, Mylar, polyester, and polyimide.

10. The interconnection of claim 8 wherein the electrical contact of at least one of said plurality of light-emitting elements overlies a portion of an exposed electrode that does not overlie one of the inorganic electro-luminescent material and the organic light-emitting material.

11. A display comprising:

a plurality of lengths of a light-emitting fiber each having a plurality of light-emitting elements along a first surface thereof, each light-emitting element having at least one exposed contact;

wherein said plural light-emitting fibers are disposed side-by-side one another with surfaces opposite the first surfaces thereof providing a viewing surface for the display;

at least one elongated electrical conductor substantially transverse to the lengths of said light-emitting fibers and disposed on the respective first surfaces thereof, wherein said at least one elongated conductor is in electrical connection with at least one of the exposed contacts on each of said plurality of light-emitting fibers; and

an electronic circuit having at least one conductor positioned proximal said at least one elongated conductor and connected thereto at a plurality of locations.

12. The display of claim 11 further comprising a material underlying said elongated electrical conductor for bridging at least part of a gap between adjacent ones of said plurality of light-emitting fibers, and wherein said material includes one of an electrically insulating material and an electrically conductive material.

13. The display of claim 12 wherein at least one of the locations at which the at least one conductor of said electronic circuit connects to said elongated conductor overlies said material.

14. The display of claim 11 wherein the at least one conductor of said electronic circuit is connected to said at least one elongated conductor by one of solder, electrically conductive epoxy and silver filled epoxy.

15. The display of claim 11 wherein said at least one elongated electrical conductor is formed by one of deposition, evaporation, and sputtering of a metal and electrically bonding a strip of metal, and wherein said metal is selected from the group consisting of aluminum, gold, silver, copper, chromium, alloys thereof, and combinations thereof.

16. The display of claim 11 wherein each said light-emitting fiber comprises an optically transparent fiber having light-emitting elements thereon including one of an inorganic electro-luminescent material and an organic light-emitting material.

17. The display of claim 16 wherein the optically-transparent fiber includes a material selected from the group consisting of glass, borosilicate glass, soda-lime glass, quartz, sapphire, plastic, polymethyl-methacrylate (PMMA), polycarbonate, acrylic, Mylar, polyester, and polyimide.

18. The display of claim 16 wherein the electrical contact of at least one of said plurality of light-emitting elements overlies an exposed electrode that does not overlie the one of the inorganic electro-luminescent material and the organic light-emitting material.

19. A display comprising:

a plurality of display modules in side-by-side abutting relationship, each said display module comprising;

a plurality of lengths of a light-emitting fiber each having a plurality of light-emitting elements along a first surface thereof, each light-emitting element having at least one exposed contact;

wherein said plural light-emitting fibers are disposed side-by-side one another with surfaces opposite the first surfaces thereof providing a viewing surface for the display;

at least one elongated electrical conductor substantially transverse to the lengths of said light-emitting fibers and disposed on the respective first surfaces thereof, wherein said at least one elongated conductor is in electrical connection with at least one of the exposed contacts on each of said plurality of light-emitting fibers; and

an electronic circuit having at least one conductor positioned proximal said at least one elongated conductor and connected thereto at a plurality of locations.

20. The display of claim 19 further comprising a material underlying said elongated electrical conductor for bridging at least part of a gap between adjacent ones of said plurality of light-emitting fibers.

21. The display of claim 20 wherein at least one of the locations at which the at least one conductor of said electronic circuit connects to said elongated conductor overlies said material.

22. A method for interconnecting a plurality of light-emitting fibers comprising:

placing in side-by-side array a plurality of light-emitting fibers having a plurality of light-emitting elements and exposed light-emitting element contacts disposed along respective first surfaces thereof, wherein the plurality of light-emitting fibers are arrayed with the first surfaces thereof and with the exposed contacts thereof in predetermined positional relationship; and

depositing an elongated electrical conductor on the first surfaces of the plurality of light-emitting fibers to provide electrical connection between predetermined ones of the exposed contacts.

23. The method of claim 22 wherein said depositing an elongated electrical conductor includes first depositing a material to bridge at least part of a gap between adjacent ones of the plurality of light-emitting fibers, and then depositing the elongated electrical conductor on the first surfaces of the plurality of light-emitting fibers and on the deposited material.

24. The method of claim 22 wherein said depositing includes masking the plurality of light-emitting fibers in side-by-side array for contemporaneously depositing the elongated conductor on each of the plurality of light-emitting fibers.

25. The method of claim 22 wherein said depositing an elongated electrical conductor includes one of depositing, evaporating, and sputtering a metal and electrically bonding a strip of metal, wherein the metal is selected from the group consisting of aluminum, gold, silver, copper, chromium, alloys thereof, and combinations thereof.

26. An interconnection of plural electrical devices comprising:

a plurality of electrical devices each having an edge surface having at least one exposed contact thereon, wherein said plural electrical devices are disposed side-by-side one another with the edge surfaces thereof residing substantially in a plane;

at least one elongated electrical conductor substantially transverse to the edge surfaces of said electrical devices and disposed on the respective edge surfaces thereof, wherein said at least one elongated conductor is in electrical connection with at least one of the exposed contacts on each of said plurality of electrical devices; and

an electrical circuit having at least one conductor proximal and substantially parallel to said at least one elongated conductor and connected thereto at a plurality of locations.

27. The interconnection of claim 26 further comprising a material underlying said elongated electrical conductor for bridging at least part of a gap between adjacent ones of said plurality of electrical devices, and wherein said material includes one of an electrically insulating material and an electrically conductive material.

28. The interconnection of claim 26 wherein said at least one elongated electrical conductor is formed by one of deposition, evaporation, and sputtering of a metal, wherein said metal is selected from the group consisting of aluminum, gold, silver, copper, chromium, alloys thereof, and combinations thereof, and wherein the at least one conductor of said electrical circuit is connected to said at least one elongated conductor by one of solder, electrically conductive epoxy and silver filled epoxy.

29. A method for interconnecting a plurality of electrical devices comprising:

placing in side-by-side array a plurality of electrical devices having an exposed contact disposed along respective first edge surfaces thereof, wherein the plurality of electrical devices are arrayed with the edge surfaces thereof and with the exposed contacts thereof in predetermined positional relationship;

depositing an elongated electrical conductor on the edge surfaces of the plurality of electrical devices to provide electrical connection between predetermined ones of the exposed contacts;

placing at least one conductor of an electrical circuit proximal and substantially parallel to the elongated electrical conductor; and

connecting the one conductor of the electrical circuit to the elongated electrical conductor at a plurality of locations.

30. The method of claim 29 wherein said depositing an elongated electrical conductor includes first depositing a material to bridge at least part of a gap between adjacent ones of the plurality of electrical devices, and then depositing the elongated electrical conductor on the edge surfaces of the plurality of electrical devices and on the deposited material.