Illumination – Light source and modifier – With ventilating – cooling or heat insulating means
Reexamination Certificate
2003-01-16
2004-09-14
Sember, Thomas M. (Department: 2875)
Illumination
Light source and modifier
With ventilating, cooling or heat insulating means
C362S373000, C362S247000, C362S241000, C362S240000
Reexamination Certificate
active
06789923
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to a backlight module for a liquid crystal display (LCD), and in particular to a backlight module having a heat dissipation structure for removing heat induced by electromagnetic radiation emitted by lamps of the LCD.
2. The Related Art
A liquid crystal display (LCD) comprises a liquid crystal panel arranged in association with a backlight module in which light sources are arranged to project light through the liquid crystal panel for formation of images on the liquid crystal panel.
FIG. 6
of the attached drawings shows a conventional backlight module, which is generally designated with reference numeral
10
, comprising a casing
11
in which lamps
12
are mounted. A light guide plate
13
, a light diffusion plate
14
and a protection plate
15
are stacked in sequence and mounted to the casing
11
in front of the lamps
12
whereby light emitted by the lamps
12
transmits through the light guide plate
13
, the light diffusion plate
14
and the protection plate
15
.
The lamps
12
of the conventional device are arranged substantially on the same plane and spaced from each other. The distance between adjacent lamps
12
induces a dark strip that leads to non-uniform distribution of brightness over the whole panel. In addition, the great number of lamps
12
mounted inside a limited space within the backlight module
10
causes a serious problem of heat that is generated by the lamps
12
during their operation.
A triangular structure comprised of a prism arranged between adjacent lamps
12
has been proposed to alleviate the non-uniform brightness issue. However, the issue of heat dissipation is not overcome yet.
Thus, it desired to have a backlight module for LCD to overcome the heat problems, while providing uniform brightness.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a backlight module comprising air passages formed by side walls made of heat conductive material and vent holes for formation of air flow through the air passages to effectively remove heat from the backlight module.
Another object of the present invention is to provide a backlight module comprising a heat dissipation structure having a triangular configuration for both removal of heat and re-direction of light to provide uniform distribution of the light.
A further object of the present invention is to provide a backlight module capable of effectively removing heat therefrom while maintaining structural strength and stability.
To achieve the above objects, in accordance with the present invention, there is provided a backlight module for liquid crystal display, comprising a casing having a bottom wall and a circumferential side wall extending from the bottom wall to define an open top. A light guide plate is attached to the side wall and spaced from the bottom to define an interior space therebetween. A light diffusion plate and a protection plate are respectively mounted to the top opening of the casing. A plurality of lamps are arranged in the interior space and spaced from each other. First vent holes are defined in the side wall of the casing to allow air to flow in and out of the interior space for removing heat generated by the lamps. Second vent holes are defined in the side wall and are paired of which the second vent holes are opposite to each other. A triangular channel is formed between the second vent holes of each pair by two inclined side walls. Air is allowed to flow into the channel via one of the second vent holes, through the channel and eventually leaving the channel via another second vent hole. The air flowing through the channel removes heat induced on the side walls by radiation of the lamps. The side walls of each channel, which have reflective surfaces, are arranged to reflect light from the adjacent lamps toward the light guide plate for uniformly distributing the light over the light guide plate.
REFERENCES:
patent: 3733461 (1973-05-01), Rohats
patent: 5034866 (1991-07-01), Pujol
patent: 5473523 (1995-12-01), Von Fange
patent: 6048075 (2000-04-01), Lai
patent: 2004/0008512 (2004-01-01), Kim
patent: 2004/0076006 (2004-04-01), Mai
Choi Jacob Y.
Rosenberg , Klein & Lee
Sember Thomas M.
LandOfFree
Backlight module with heat dissipation structure does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Backlight module with heat dissipation structure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Backlight module with heat dissipation structure will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3185288