Thermal spreading sheet and method for manufacturing the same, and backlight unit with the same

• US 20070091611A1
• Filed: 12/22/2005
• Published: 04/26/2007
• Est. Priority Date: 10/24/2005
• Status: Abandoned Application

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Hwang, Kab
• Application Number:
  US11/313,793
• Publication Number:
  US 20070091611A1
• Time in Patent Office: Days
• US Class Current: 362/294
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0085 Means for removing heat created by the light source from the package heat extraction or cooling elements for semiconductor light sources in general H01L33/64

Abstract

The present invention relates to a thermal spreading sheet with superior ductility and strength, and a method for manufacturing the same. One method for manufacturing the thermal spreading sheet according to the present invention comprises the steps of mixing graphite powder and binder; and applying the mixture of graphite powder and binder onto the surface of a reflective sheet to form the thermal spreading sheet with a predetermined thickness. The binder is preferable to contain polyurethane, acrylic or silicon. And, the mixture of graphite powder and binder is preferable to contain copper or silver. Another method for manufacturing the thermal spreading sheet according to the present invention comprises the steps of adding an acrylic resin into a fine graphite particle to form a nano-composite; and compressing the nano-composite at a high temperature. The method for manufacturing the thermal spreading sheet further comprises the step of adding a resin having high thermal conductivity into the nano-composite.

Claims

1. A method for manufacturing a thermal spreading sheet, comprising:

(a) mixing graphite powder and binder; and

(b) applying the mixture of graphite powder and binder onto the surface of a reflective sheet to form the thermal spreading sheet with a predetermined thickness.

2. The method of claim 1, wherein the binder contains polyurethane, acrylic or silicon.

3. The method of claim 2, wherein the mixture contains copper or silver.

4. A method for manufacturing a thermal spreading sheet, comprising:

(a) adding an acrylic resin into a fine graphite particle to form a nano-composite; and

(b) compressing the nano-composite at a high temperature.

5. The method of claim 4, further including:

adding a resin having high thermal conductivity into the nano-composite.

8. A back light unit manufactured by the method of claim 4, including a thermal spreading sheet disposed on the lower part of a reflective sheet.

9. A back light unit manufactured by the method of claim 5, including a thermal spreading sheet disposed on the lower part of a reflective sheet.

6. A thermal spreading sheet comprising the mixture of graphite powder and binder, wherein the thermal spreading sheet is formed as a coating with a predetermined thickness on the surface of a reflective sheet.

7. A back light unit comprising a thermal spreading sheet comprising the mixture of graphite powder and binder,

wherein the thermal spreading sheet is formed as a coating with a predetermined thickness on the surface of a reflective sheet.