LED display module having a metallic housing and metallic mask

• US 8,154,864 B1
• Filed: 08/21/2008
• Issued: 04/10/2012
• Est. Priority Date: 09/14/2007
• Status: Active Grant

• Current Assignee: Daktronics Incorporated
• Original Assignee: Daktronics Incorporated
• Inventors: Nearman, Nathan L., Mutschelknaus, Shannon Lee, Mueller, Matthew R., Tvedt, Douglas P., Miller, Kent S., Dennis, Mark D., Nielsen, Ryan J., Hage, John L.
• Primary Examiner(s): Datskovskiy, Michail V
• Application Number:
  US12/229,289
• Time in Patent Office: 1,328 Days
• Field of Search: 361/679.01, 361/679.21, 361/679.46, 361/679.54, 361690-692, 361704-712, 361720-727, 361/825, 361/816, 361/818, 361/831, 165/80.3, 165/104.33, 165/185, 313/40, 313 44- 46, 313/48, 313/493, 313582-587, 313/634, 345204-206, 345/39, 345/43, 345/44, 345/55, 345/82, 345/87, 345/165, 345/905, 349/56, 349/58, 349/59, 349/60, 349/61, 349/62, 349/63, 349/150, 349/151, 349/20, 349/32, 349/73, 349/121, 349/161, 362/249.01, 362/249.02, 362364-374, 362/294, 362/612, 174/15.1, 174/16.1, 174/16.3, 174/252, 174/260, 174/50.52
• US Class Current: 361/679.46
• CPC Class Codes: G09F 9/3026 Video wall, i.e. stackable semiconductor matrix display modules video wall control systems G06F3/1446, G09G2300/026
• CPC Class Codes: G09F 9/33 being semiconductor devices, e.g. diodes
• CPC Class Codes: H05K 7/2039 characterised by the heat transfer by conduction from the heat generating element to a dissipating body arrangements for increasing/decreasing heat-transfer, e.g. fins details, F28F13/00

Abstract

The present invention is a robust LED display module for use in an electronic sign which display module includes a metallic housing, a heat conductive interface panel, an LED circuit board and LEDs, and a metallic mask arranged in intimate contact and association therewith, and which components operate synergistically in concert with each other in order to evenly distribute, reduce and dissipate heat along, about and within the structure of the present invention. Display uniformity is provided by the use of major metallic structures in order to prevent warpage and to protect the geometric integrity of the LED display module.

Claims

1. An LED display module comprising:

a. an expansive metallic housing;

b. an LED circuit board;

c. a heat conductive interface panel sandwiched between said expansive metallic housing and said LED circuit board; and

,

d. an expansive metallic mask on the open side of said LED circuit board, said metallic housing, said LED circuit board, said heat conductive interface panel, and said metallic mask being joined together in an abutting relationship by metallic fastening means.

2. The LED display module of claim 1, wherein said metallic fastening means are metal screws.

3. The LED display module of claim 2, wherein said expansive metallic housing and said metallic mask are made from magnesium or from a combination of metallic materials.

4. The LED display module of claim 3, wherein said metallic housing and said metallic mask are electrically grounded.

5. The LED display module of claim 1, wherein said LED circuit board has a front planar surface and a rear planar surface, a plurality of spaced LEDs being attached to said front planar surface and extending therefrom in a patterned arrangement, and said metallic mask having a grid-like structure such that portions thereof surround said LEDs.

6. The LED display module of claim 5, wherein said patterned arrangement of spaced LEDs includes multiple rows of spaced LEDs interspersed with adjacent surface sections of said front planar surface of said LED circuit board and said grid-like structure of said metallic mask having heat sink pads on said surface sections, said heat sink pads being adjacent said spaced LEDs.

7. The LED display module of claim 6, wherein each successive row of spaced LEDs is offset from said preceding row of spaced LEDs.

8. The LED display module of claim 1, wherein said expansive metallic housing has a planar front surface and a planar rear surface and wherein said rear surface of said expansive metallic housing has a plurality of vertically oriented, spaced, cooling fins attached thereto.

9. The LED display module of claim 8, wherein said LED circuit board has a plurality of spaced heat sinks extending from the rear surface thereof and through openings in said heat conductive interface panel and said expansive metallic housing.

10. The LED display module of claim 9, wherein said expansive metallic housing has a continuous perimetrical lip extending forwardly from said front planar surface thereof towards said metallic mask and a continuous perimetrical lip extending rearwardly from said rear planar surface thereof.

11. The LED display module of claim 10, wherein said heat conductive interface panel is contained within the space formed by said front planar surface of said metallic housing and said continuous perimetrical lip extending forwardly from said front planar surface of said metallic housing.

12. The LED display module of claim 11, wherein said metallic fastening means are metal screws.

13. The LED display module of claim 12, wherein said expansive metallic housing and said metallic mask are made from magnesium or from a combination of metallic materials.

14. The LED display module of claim 13, wherein said metallic housing and said metallic mask are electrically grounded.

15. The LED display module of claim 14, wherein a plurality of spaced helical spring latch assemblies is fixed to said rear surface of said metallic housing and wherein each of said plurality of helical spring latch assemblies is actuated by a pivot pin connected thereto and accessible from the front of said metallic mask via a plurality of aligned access holes through said metallic mask, through said LED circuit board, through said heat conductive interface panel and through said metallic housing.

16. The LED display module of claim 15, wherein each of said helical spring latch assemblies is fixed to said rear surface of said metallic housing by a pair of spaced mounts which function as cooling fins.

17. The LED display module of claim 1, wherein each of said expansive metallic housing, said LED circuit board, said heat conductive interface panel, and said metallic mask is substantially square or rectangular in configuration.

18. The LED display module of claim 2, wherein said metal screws are securely spaced near and within the perimeter of said expansive metallic housing and extend therethrough and through spaced holes in said LED circuit board, through corresponding spaced holes in said heat conductive interface panel and into said metallic mask.

19. The LED display module of claim 12, wherein said metal screws are securely spaced near and within the perimeter of said expansive metallic housing and extend therethrough and through spaced holes in said LED circuit board, through corresponding spaced holes in said heat conductive interface panel and into said metallic mask.

20. An electronic display sign comprising a plurality of display modules as claimed in claim 1, wherein said display modules are arranged in adjacent juxtaposition.