Illumination – Light source and modifier – Including reflector
Reexamination Certificate
2002-08-13
2004-07-27
Cariaso, Alan (Department: 2875)
Illumination
Light source and modifier
Including reflector
C362S307000, C362S346000
Reexamination Certificate
active
06767113
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a backlight unit, more particularly, to a multi-angle reflector for use in a backlight unit.
2. Description of the Related Art
Referring to
FIG. 1
, according to Japan Patent Publication No. 05-323312, the conventional backlight unit
1
comprises a plurality of lamps
11
, a diffuser
12
and a reflector
13
. The backlight unit
1
is disposed under a liquid crystal panel in the liquid crystal display device. The lamps
11
, which can be fluorescent lamps, are used for providing light source. The diffuser
12
, used in diffusing the light emitted from the lamps
11
to the liquid crystal panel, is placed above the lamps
11
, and the material of the diffuser
12
is usually polymethymetharylate (PMMA) or polycarbonate (PC). The reflector
13
, which is made of reflecting polycarbonate or polyethylene terephthalate (PET), is disposed under the lamps
11
for used for reflecting the bottom light source emitted from the backlight unit
1
to the diffuser
12
.
Because the lamps
11
are disposed directly under the diffuser
12
, the brightness is high in the direct under type of backlight unit
1
. Furthermore, its weight is lighter than other types of backlight unit by the simple structure. In addition, when users look at the monitors, they will feel the view angles larger because there are no shelters above the diffuser
12
in the direct under type of backlight unit
1
. On the other hand, the regions directly above the lamps
11
are brighter because the light emits directly onto the diffuser
12
while the regions between the lamps are darker. Thus, the lights are not uniform. Besides, enough space should be kept between the lamps
11
and the diffuser
12
in the direct under type of backlight unit
1
to avoid being over bright in view of that the lamps
11
emit light to the diffuser
12
directly. Therefore, compared with other types of backlight unit, the direct under type is thicker.
Besides, because the conventional reflector
13
is integrally made, the reflecting angles and the distance between the reflector
13
and lamps
11
are fixed. The reflecting angles of the reflector
13
cannot be adjusted according to the brightness, the number of the lamps
11
and the distance between the reflector
13
and lamps
11
. The lights reflected to the diffuser
12
are not uniform.
Therefore, it is necessary to provide an innovative and progressive multi-angle reflector so as to solve the above problem.
SUMMARY OF THE INVENTION
One objective of the present invention is to provide a multi-angle reflector for use in a backlight unit. The backlight unit comprises a plurality of lamps, a reflector and a diffuser. The diffuser is disposed above the lamps. The multi-angle reflector is disposed under the lamps. The reflector with a plurality of reflection angles comprises a plate and a plurality of reflecting protrusions. The plate has a top surface facing the lamps. The reflecting protrusions are respectively disposed on the top surface of the plate. Each reflecting protrusion has a reflecting surface. The reflecting surfaces have respective reflecting angles corresponding to the top surface of the plate so that the lights from lamps are adapted to reflect to the diffuser according to the reflecting angles.
Therefore, according to the invention, the reflecting angles of the reflecting surfaces on the reflecting protrusions can be adjusted so as to suit to the number of lamps and the distance between lamps and the reflector. The lights are reflected to the diffuser by various reflecting angles, and the lights are uniform and the utility of the lights is improved. Because the reflecting protrusions are small, the reflector can be made into a thin type. For the whole structure, the thickness of the backlight unit is decreased.
REFERENCES:
patent: 4425604 (1984-01-01), Imai et al.
patent: 4599684 (1986-07-01), Lee
patent: 5567042 (1996-10-01), Farchmin et al.
patent: 6491411 (2002-12-01), Itoh
patent: 05-323312 (1993-07-01), None
patent: 6052708 (1994-02-01), None
Cariaso Alan
Chi Mei Optoelectronics Corp.
Senniger Powers Leavitt & Roedel
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