Heat spreader for emissive display device

• US 20050079355A1
• Filed: 05/12/2004
• Published: 04/14/2005
• Est. Priority Date: 10/14/2003
• Status: Active Grant

• 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
• Granted Patent: US 7,150,914 B2
• Time in Patent Office: Days
• 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. A heat spreader for an emissive display device, 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 emissive display device.

2. The heat spreader of claim 1 wherein the emissive display device comprises a plasma display panel.

3. The heat spreader of claim 2 wherein the at least one sheet of compressed particles of exfoliated graphite has a surface area greater than the surface area of that part of a plurality of discharge cells facing the back surface of the plasma display panel

4. The heat spreader of claim 1 wherein the heat spreader comprises a laminate comprising a plurality of sheets of compressed particles of exfoliated graphite.

5. The heat spreader of claim 4 wherein the laminate comprises layers of a non-graphitic material.

6. The heat spreader of claim 5 wherein the non-graphitic layers comprise a metal, a polymer or an insulating material.

7. The heat spreader of claim 1 wherein the heat spreader comprises an adhesive thereon and a release material positioned such that the adhesive is sandwiched between the heat spreader and the release material.

8. The heat spreader of claim 7 wherein the release material and adhesive are selected to permit a predetermined rate of release of the release material without causing undesirable damage to the heat spreader.

9. The heat spreader of claim 8 wherein the adhesive and release material provide an average release load of no greater than about 40 grams per centimeter at a release speed of one meter per second.

10. The heat spreader of claim 9 wherein the average release load is no greater than about 10 grams per centimeter at a release speed of one meter per second.

11. The heat spreader of claim 9 wherein the adhesive achieves a minimum lap shear adhesion strength of at least about 125 grams per square centimeter.

12. The heat spreader of claim 11 wherein the adhesive achieves an average lap shear adhesion strength of at least about 700 grams per square centimeter.

13. The heat spreader of claim 11 wherein the adhesive results in an increase in through thickness thermal resistance of the adhesive/heat spreader material of not more than about 35% as compared to the heat spreader material itself.

14. The heat spreader of claim 13 wherein the thickness of the adhesive is no greater than about 0.015 mm.

15. The heat spreader of claim 14 wherein the thickness of the adhesive is no greater than about 0.006 mm.