Heat spreader for emissive display device

• US 7,150,914 B2
• Filed: 05/12/2004
• Issued: 12/19/2006
• Est. Priority Date: 10/14/2003
• Status: Expired due to Term

• Current Assignee: NeoGraf Solutions, LLC
• Original Assignee: Advanced Energy Technology Inc. (Graftech International Limited)
• Inventors: Smalc, Martin David, Clovesko, Timothy, Norley, Julian, Capp, Joseph Paul
• Primary Examiner(s): McNeil, Jennifer C.
• Assistant Examiner(s): MILLER, DANIEL H
• Application Number:
  US10/844,537
• Publication Number:
  US 20050079355A1
• Time in Patent Office: 951 Days
• Field of Search: 428/408, 428/41, 423/448, 313/46, 257/707, 257751-756
• US Class Current: 428/408
• CPC Class Codes: B32B 43/006 Delaminating
• CPC Class Codes: B32B 9/00 Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: H01J 2211/66 Cooling arrangements cooling or supporting means not being part of the tube H05K
• CPC Class Codes: H01J 2217/492 Details
• CPC Class Codes: H01J 7/24 Cooling arrangements; Heating arrangements; Means for circulating gas or vapour within the discharge space
• CPC Class Codes: H01J 9/20 Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
• 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: H05K 7/20963 Heat transfer by conduction from internal heat source to heat radiating structure H05K7/20972 takes precedence
• CPC Class Codes: Y10T 428/24273 including aperture
• CPC Class Codes: Y10T 428/30 Self-sustaining carbon mass or layer with impregnant or other layer

Abstract

A heat spreader for an emissive display device, such as a plasma display panel or a light emitting diode, comprising at least one sheet of compressed particles of exfoliated graphite having a surface area greater than the surface area of that part of a discharge cell facing the back surface of the device.

Claims

1. An emissive display device having a plurality of discharge cells, the emissive display device comprising a heat spreader having two major surfaces, the heat spreader comprising at least one sheet of compressed particles of exfoliated graphite and an adhesive, wherein substantially all of one of the major surfaces of the heat spreader is in direct thermal contact with the emissive display device such that it overlays a plurality of the discharge cells and the adhesive adheres the heat spreader to the emissive display device sufficiently to maintain the heat spreader in position regardless of the orientation of the emissive display device.

2. The emissive display device of claim 1 which comprises a plasma display panel.

3. The emissive display device of claim 1 wherein the heat spreader comprises a laminate comprising a plurality of sheets of compressed particles of exfoliated graphite.

4. The emissive display device of claim 1 wherein the heat spreader comprises at least one layer of a non-graphitic material.

5. The emissive display device of claim 4 wherein the non-graphitic layer comprises a metal, a polymer or an insulating material.

6. The emissive display device of claim 1 wherein the adhesive achieves a minimum lap shear adhesion strength of at least about 125 grams per square centimeter.

7. The emissive display device of claim 1 wherein the adhesive results in an increase in through thickness thermal resistance of the heat spreader of not more than about 35% as compared to the heat spreader without adhesive.

8. The emissive display device of claim 1 which comprises light emitting diodes.