Sealing of large area display structures

• US 6,370,019 B1
• Filed: 02/16/1999
• Issued: 04/09/2002
• Est. Priority Date: 02/17/1998
• Status: Expired due to Term

• Current Assignee: MEC Management, LLC (Three Affiliated Tribes of the Fort Berthold Reservation, North Dakota)
• Original Assignee: Sarnoff Corporation (SRI International, Inc.)
• Inventors: Atherton, James Harold, Shen, Zilan, Matthies, Dennis Lee, Stewart, Roger Green
• Primary Examiner(s): Picard, Leo P.
• Assistant Examiner(s): FOSTER, DAVID A
• Application Number:
  US09/250,329
• Time in Patent Office: 1,148 Days
• Field of Search: 345/50, 345/55, 345/59, 345/60, 345/33, 345/38, 349/73, 349/153, 349/190, 313/506, 313/509, 313/510, 313/512, 313/422, 313/495, 315/169.1, 315/169.2, 315/169.3, 361/681, 361/682
• US Class Current: 361/679.22
• CPC Class Codes: G02F 1/13336 Combining plural substrates to produce large-area displays, e.g. tiled displays
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/1345 Conductors connecting electrodes to cell terminals
• CPC Class Codes: G09G 2300/026 Video wall, i.e. juxtaposition of a plurality of screens to create a display screen of bigger dimensions
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: H01L 25/167 comprising optoelectronic devices, e.g. LED, photodiodes
• CPC Class Codes: H01L 27/156 two-dimensional arrays
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 2924/09701 Low temperature co-fired ceramic [LTCC]
• CPC Class Codes: H10K 50/841 Self-supporting sealing arrangements
• CPC Class Codes: H10K 50/8426 Peripheral sealing arrangements, e.g. adhesives, sealants
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/179 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/18 Tiled displays

Abstract

A plurality of sealing methods may be used either alone or in combination with each other to seal an electronic display structure. The display module includes a first substrate having a plurality of column electrodes. Each of a plurality of portions of a display material are coupled to one of the plurality of column electrodes and to one of a plurality of row electrodes. A pixel seal may be formed over the display material to encapsulate the display material. An area seal may be formed upon the first substrate to encapsulates the row electrodes, the column electrodes, and the portions of display material. A bead seal may be formed around the perimeter of the first substrate to couple it to a second substrate while sealing the internal display material. An edge seal may be formed by a banded structure spanning from the first substrate to the second substrate and extending around the perimeter of the substrates.

Claims

1. An electronic display structure comprising:

a display module including;

a first substrate having a plurality of column electrodes;

a plurality of row electrodes;

a plurality of portions of a display material, each coupled to one of the plurality of row electrodes and to one of the plurality of column electrodes; and

an area seal formed upon the first substrate and encapsulating the row electrodes, the column electrodes, and the portions of display material.

2. An electronic display structure according to claim 1 wherein the area seal comprises an anisotropically conductive structure for encapsulating the plurality of row electrodes, the plurality of column electrodes, and the plurality of portions of the display material, and for coupling each of the plurality of row and column electrodes to a respective signal line.

3. An electronic display structure according to claim 2 further comprising a circuit module including a plurality of signal lines each corresponding to one of the plurality of row and column electrodes wherein the anisotropically conductive structure seals the circuit module and the display module, adheres the circuit module to the display module, and couples each of the plurality of row and column electrodes to its respective signal line.

4. An electronic display structure according to claim 3 wherein the anisotropically conductive structure is substantially black.

5. An electronic display structure according to claim 3 wherein the anisotropically conductive structure includes:

a plurality of conductive bumps formed on at least one of a row or column electrode and its corresponding signal line to couple one of the plurality of row and column electrodes to its corresponding signal line; and

an adhesive for sealing the circuit module and the display module and adhering the circuit module to the display module.

6. An electronic display structure according to claim 3 wherein the anisotropically conductive structure includes:

an anisotropically conductive sealant including a mixture of an adhesive and conductive particles wherein causing one of localized pressure, localized magnetic field, and localized electromigration causes the conductive particles to couple each of the plurality of row and column electrodes to its corresponding signal line.

7. An electronic display structure according to claim 6 wherein the anisotropically conductive structure further includes a plurality of conductive bumps extending at least partially between the plurality of signal lines and their corresponding row or column electrodes.

8. An electronic display structure according to claim 3 wherein each of the plurality of portions of the display material is formed upon one of the plurality of column electrodes is encapsulated by one of the plurality of row electrodes formed thereupon.

9. An electronic display structure according to claim 3 further comprising a band seal spanning from the display module to the circuit module and extending around the perimeter of the circuit and display modules.

10. An electronic display structure according to claim 1 further comprising a display seal to encapsulate the display structure.

11. An electronic display structure according to claim 8 further comprising an insulating pad formed upon the first substrate, the plurality of column electrodes, the plurality of row electrodes, and the plurality of portions of the display material, and including apertures for coupling each of the plurality of row and column electrodes to its respective signal line.

12. An electronic display structure comprising:

a display module;

a circuit module including a plurality of signal lines; and

an anisotropically conductive structure for adhering the circuit module to the display module, and for electrically coupling signals between the circuit module and the display module.

13. An electronic display structure comprising:

a display module including;

a plurality of column electrodes, and

a plurality of portions of a display material, each having a first side coupled to one of the plurality of column electrodes and a second side,

a plurality of row electrodes coupled to each of the plurality of portions of the display material, and

sealing means for sealing each of the plurality of portions of the display material.

14. An electronic display structure according to claim 13 wherein the sealing means comprises

a plurality of row electrodes coupled to and encapsulating each of the plurality of portions of the display material.

15. An electronic display structure according to claim 14 further comprising a band seal spanning from the display module to the circuit module and extending around the perimeter of the circuit and display modules.

16. An electronic display structure according to claim 13 wherein the sealing means comprises an insulating layer formed upon each of the plurality of portions of the display material wherein the insulating material has a via formed therein to the display material and the row electrode contacts the display material through the via.

17. An electronic display structure according to claim 14 wherein the display material includes an organic electroluminescent material.

18. An electronic display structure comprising:

a display module including a substrate with a first surface and a second surface, the display module having an outer portion, and an inner portion, the inner portion including;

a plurality of column electrodes formed on the first surface of the substrate,

a plurality of row electrodes, and

a plurality of portions of a display material, each controlled by one of the plurality of row electrodes and by one of the plurality of column electrodes;

a circuit module having an outer area and an inner area, the inner area including a plurality of signal lines each corresponding to one of the plurality of row and column electrodes;

a bead seal having a first side coupled to the outer area of the circuit module and a second side coupled to the outer area of the display module; and

a masking layer formed opposite the circuit module on one of the bead seal, the first surface of the substrate, and the second surface of the substrate, wherein the masking layer acts to hide the bead seal when the display structure is viewed from the first surface of the substrate.

19. An electronic display structure according to claim 18 wherein the circuit module has a back side including an integrated circuit and the row electrodes and column electrodes are coupled to the integrated circuit through electronic display structure.

20. An electronic display structure according to claim 18 wherein each of the plurality of portions of the display material corresponds to a pixel and a gap is formed between adjacent pixels on the substrate and the bead seal has a width less than one-half of the gap between adjacent pixels.

21. An electronic display structure according to claim 18 wherein each of the plurality of portions of the display material is encapsulated by one of the plurality of row electrodes.

22. An electronic display structure according to claim 18 wherein the bead seal is substantially uniform throughout the outer area of the display module.

23. An electronic display structure comprising:

a display module including a substrate with a first surface and a second surface, the display module having an outer portion, and an inner portion, the inner portion including;

a plurality of column electrodes formed on the first surface of the substrate,

a plurality of row electrodes, and

a plurality of portions of a display material, each controlled by one of the plurality of row electrodes and by one of the plurality of column electrodes;

a circuit module having an outer area and an inner area, the inner area including a plurality of signal lines each corresponding to one of the plurality of row and column electrodes;

a substantially uniform bead seal having a first side coupled to the outer area of the circuit module and a second side coupled to the outer area of the display module.

24. An electronic display structure comprising:

a display module having an outer perimeter;

a circuit module having an outer perimeter and coupled to the display module;

a band seal spanning from the display module to the circuit module and extending around the outer perimeter of the circuit and display modules; and

a masking layer formed on an end of the band seal wherein the masking layer acts to hide the band seal when the band seal is viewed through the display module.

25. An electronic display structure according to claim 24 wherein the band seal is comprised of one of metal, glass, and polymer.

26. An electronic display structure according to claim 24 wherein the circuit module has a back side including an integrated circuit and the row electrodes and column electrodes are coupled to the integrated circuit through electronic display structure.

27. An electronic display structure according to claim 24 wherein the display module includes a plurality of portions of a display material each formed upon one of a plurality of column electrodes and each encapsulated by one of a plurality of row electrodes for sealing each of the plurality of portions of the display material.

28. An electronic display structure comprising:

a display module having an outer perimeter;

a circuit module having an outer perimeter and coupled to the display module;

a substantially uniform band seal spanning from the display module to the circuit module and extending around the outer perimeter of the circuit and display modules.