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Direct back light unit with heat exchange
| Details |
Inventors: Hsieh, Chin-Kun; Yu, Chuan-Pei; Liu, Han-Chou;
Assignee: AU Optronics Corp. (Hsin-Chu, TW)
Primary Examiner: O'Shea; Sandra
Assistant Examiner: Cranson, Jr.; James W
Attorney, Agent or Firm: Hsu; Winston
A backlight unit with high thermal dissipation. The back light unit includes a light source generator positioned in a backside of a display panel for providing light beams to the display panel, a diffuser positioned between the light source generator and the display panel for uniformly scattering light beams from the light source generator to the display panel, and a housing enclosing the light source generator and connecting to the diffuser for reflecting the light beams to the diffuser. The housing further includes a heat pipe for being a heat transfer interface between the back light unit and an external environment. |
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DETAILED DESCRIPTION The primary advantage of the present invention is that the present invention back light unit contains a plurality of heat pipes with high thermal conductivity formed on the housing so that the internal portion of the back light unit can be maintained in an isothermal state to avoid heat being accumulated around the light source generator and the heat dissipation effect can be increased.
FIG.
2 is a section view of a back light unit 110 according to the first embodiment of the present invention.
FIG.
3 is a top view of the back light unit 110 in FIG.
2.
The back light unit 110 is a direct-underlying type back light unit set in the backside of a display panel 120, which comprises a diffuser 116, a light source generator 112 set under the diffuser 116, and a housing 118 enclosing the light source generator 112.
The back light unit 110 also comprises a diffusion film and a plurality of prisms (not shown) set on the diffuser 116 to correct the lightness and uniformity of the back light unit 110.
The sidewalls of the housing 118 extend up to connect to the edge of the diffuser 116 so that a chamber 122 is formed inside the housing 118.
On the inside surface of the housing 118 is a layer of reflecting film 114 so that the utility of light can be raised so that light beams emitted from the light source generator 112 will be reflected by the reflecting film 114 to pass through the chamber 122 to the diffuser 116.
Furthermore, a plurality of heat pipes 124 are positioned at the contact points of the upside of the housing 118 and the diffuser 116, and each heat pipe 124 can selectively be connected to a radiator piece 126 with high heat conductivity for being a heat transfer interface between the back light unit 110 and the external environment.
The light source generator 112 comprises a plurality of fluorescent tubes, wherein the type, shape, and arrangement of the fluorescent tubes are not limited in the present invention.
In this embodiment, the light source generator 112 is composed of a plurality of cold cathode fluorescent lamps (CCFL) arranged in parallel with each other in the chamber 122
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Light Fixtures 
