Sealed pixel assemblies, kits and methods

• US 8,552,928 B2
• Filed: 01/10/2011
• Issued: 10/08/2013
• Est. Priority Date: 10/14/2004
• Status: Active Grant

• Current Assignee: Daktronics Incorporated
• Original Assignee: Daktronics Incorporated
• Inventors: Wendler, Brett David, Bravek, Eric Steven, Grebel, Erich J.
• Primary Examiner(s): Amini, Javid A
• Application Number:
  US12/987,584
• Publication Number:
  US 20110102307A1
• Time in Patent Office: 1,002 Days
• Field of Search: 345/619, 345/33, 345/30, 345/39, 345/51, 345/581
• US Class Current: 345/33
• CPC Class Codes: F21V 15/01 Housings, e.g. material or assembling of housing parts F21V15/02 takes precedence housings forming signs or letters G09F13/04
• CPC Class Codes: F21V 23/06 the elements being coupling devices , e.g. connectors
• CPC Class Codes: F21V 31/005 Sealing arrangements therefor
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G09F 13/22 electroluminescent electroluminescent light sources per se H05B33/00
• CPC Class Codes: G09F 9/301 flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
• CPC Class Codes: G09F 9/33 being semiconductor devices, e.g. diodes
• CPC Class Codes: G09G 2300/04 Structural and physical details of display devices
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2310/0221 with use of split matrices G09G3/3644 and G09G3/3666 take precedence
• CPC Class Codes: G09G 3/06 using controlled light sources
• CPC Class Codes: G09G 3/12 using electroluminescent elements
• CPC Class Codes: G09G 3/32 semiconductive, e.g. using light-emitting diodes [LED]
• CPC Class Codes: H05K 3/284 for encapsulating mounted components H05K1/185 takes precedence
• CPC Class Codes: H05K 3/32 electrically connecting electric components or wires to printed circuits
• CPC Class Codes: H05K 3/368 parallel to each other H05K3/361 takes precedence
• CPC Class Codes: H05K 5/064 sealed by potting, e.g. waterproof resin poured in a rigid casing
• CPC Class Codes: Y10T 29/49126 Assembling bases
• CPC Class Codes: Y10T 29/49128 Assembling formed circuit to base

Abstract

Discrete flexible pixel assemblies can be hermetically sealed from the environment and can comprise unitary, self-contained replaceable modules which enable efficient, economical production of large scale, free-form electronic displays, signs and lighting effects for outdoor use. The method and means for producing hermetically sealed discrete flexible pixel assemblies can include encapsulation means, exterior encasement means, and cable connector means.

Claims

1. A sealed pixel assembly comprising:

a circuit board including one or more light emitting elements, each light emitting element having an electrical conductor coupled with the circuit board at a base end;

a potting shell at least partially enclosing the circuit board and the one or more light emitting elements;

an encapsulation potting material disposed within the potting shell, the encapsulation potting material encapsulating and hermetically sealing the electrical conductor and the base end of each of the one or more light emitting elements, and at least a portion of the circuit board; and

one or more cables extending from the circuit board, the one or more cables configured for coupling with at least one other sealed pixel assembly to form an electronic display.

2. The sealed pixel assembly of claim 1, wherein a top end of each of the one or more light emitting elements extends out of the encapsulation potting material.

3. The sealed pixel assembly of claim 1, further comprising an encasement cover having an internal cavity configured to receive at least a portion of the potting shell, the circuit board, the one or more light emitting elements, and the encapsulation material.

4. The sealed pixel assembly of claim 3, wherein the encapsulation material is positioned in the encasement cover after the encasement cover receives at least a portion the circuit board and the one or more light emitting elements.

5. The sealed pixel assembly of claim 3, wherein the encasement cover includes one or more light emitting orifices, each light emitting orifice configured to receive a top end of a light emitting element.

6. The sealed pixel assembly of claim 3, wherein the encasement cover is transparent.

7. The sealed pixel assembly of claim 3, wherein the encasement cover is optically opaque.

8. The sealed pixel assembly of claim 3, wherein the encasement cover is configured to receive and engage a barrier seal to establish a sealed barrier between the internal cavity and an exterior environment.

9. The sealed pixel assembly of claim 1, further comprising an input connector and an output connector, the input and output connectors coupled to the circuit board by the one or more cables.

10. The sealed pixel assembly of claim 1, wherein a portion of the one or more cables are encapsulated and hermetically sealed with the encapsulation potting material at the point of coupling to the circuit board.

11. The sealed pixel assembly of claim 1, wherein the one or more light emitting elements include a plurality of red, green or blue LEDs.

12. The sealed pixel assembly of claim 1, wherein the encapsulation potting material includes a potting resin or a potting gel that is configured to harden on exposure to the atmosphere, heat, or a reactive agent.

13. The sealed pixel assembly of claim 1, wherein the encapsulation potting material includes a ductile foam or a malleable solid potting material.

14. The sealed pixel assembly of claim 1, further comprising one or more mechanical fasteners configured to couple the circuit board to a non-planar mounting surface.

15. A kit comprising:

a plurality of sealed pixel assemblies as recited in claim 1,

wherein the plurality of sealed pixel assemblies are configured to conform to a non-planar surface and provide an electronic display.

20. The sealed pixel assembly of claim 1, wherein the encapsulation potting material seals at least the electrical conductor and the base end of each of the one or more light emitting elements and at least the portion of the circuit board from at least one of moisture, humidity, solar radiation, atmospheric pressure changes, vacuum, corrosive chemicals, electrical shock, thermal shock, and mechanical shock.

16. A method comprising:

providing or receiving a plurality of sealed pixel assemblies, wherein each sealed pixel assembly includes;

a circuit board including one or more light emitting elements, each light emitting element having an electrical conductor coupled with the circuit board at a base end;

a potting shell at least partially enclosing the circuit board and the one or more light emitting elements;

an encapsulation potting material disposed within the potting shell, the encapsulating potting material encapsulating and hermetically sealing the electrical conductor and the base end of each of the one or more light emitting elements, and at least a portion of the circuit board, and

one or more cables extending from the circuit board; and

connecting the plurality of sealed pixel assemblies to form a flexible pixel string, including coupling an output connector of a first sealed pixel assembly and an input connector of a second sealed pixel assembly.

17. The method of claim 16, further comprising combining at least a first flexible pixel string and a second flexible pixel string to form an electronic display.

18. The method of claim 16, further comprising coupling the plurality of sealed pixel assemblies to a non-planar mounting surface using one or more mechanical fasteners.

19. The method of claim 16, wherein connecting the plurality of sealed pixel assemblies includes serially coupling cables attached to the input and output connectors of adjacent sealed pixel assemblies.

21. The method of claim 16, wherein the encapsulation potting material hermetically seals a portion of the one or more cables at a point of coupling to the circuit board.