Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2001-06-29
2003-07-01
Gandhi, Jayprakash N. (Department: 2125)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S689000, C361S800000, C361S801000, C174S034000, C174S051000, C349S058000
Reexamination Certificate
active
06587355
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a liquid crystal display, and more particularly to a liquid crystal display module that is adaptive for improving a ground connection between a printed circuit board and a ground plate.
2. Description of the Related Art
Generally, a liquid crystal display module consists of a liquid crystal panel and a driving circuitry for driving the liquid crystal display panel. The liquid crystal display panel includes liquid crystal cells arranged between two glass substrates in a matrix type, and switching devices for switching signals applied to the liquid crystal cells. Since the liquid crystal display module includes a glass substrate and thus is liable to be damaged due to an external impact, a case for enclosing the outside of the liquid crystal display module to protect the liquid crystal display module has been used in order to prevent a damage of the liquid crystal display module caused by an external impact.
Referring to
FIG. 1
, a liquid crystal module
1
includes a liquid crystal display panel
80
, a frame
82
made from a plastic material, and a top case
2
engaged to the frame
82
to enclose the edge of the liquid crystal display module
1
.
The liquid crystal panel
80
has a printed circuit board (PCB)
4
mounted with a driving circuitry (not shown). The plastic frame
82
is provided with a lamp for a backlight (not shown), a light guide and sheets for light reflection, diffusion and focusing, etc.
The liquid crystal display panel
80
is inserted into latches (not shown) provided at the front side corner of the plastic frame
82
to fix it to the plastic frame
82
. At this time, the PCB
4
is folded in such a manner to enclose the rear side of the plastic frame
82
to be positioned at the upper rear side of the plastic frame
82
. The plastic frame fixed with the liquid crystal display panel
80
in this manner is inserted into the top case
2
, and then secured to it by means of an engaging member.
As described above, the liquid crystal display module
1
includes the liquid crystal display panel
80
, the plastic frame
82
and the top case
2
, etc. The PCB
4
is very liable to be damaged by a static electricity generated from the attached driving circuitry and the interior of the liquid crystal display module
1
. Accordingly, a ground part is provided at the top case
2
, as shown in FIG.
2
A and
FIG. 2B
, in order to protect the PCB
4
from a static electricity.
FIG.
2
A and
FIG. 2B
are a detailed section view and a side view representing a ground part A of the liquid crystal display module
1
shown in
FIG. 1
, respectively.
Referring to FIG.
2
A and
FIG. 2B
, the ground part of the conventional liquid crystal display module
1
includes a PCB
4
mounted with a driving circuitry for applying a driving signal to a liquid crystal display panel, a top case
2
that takes the form of bracket and is provided with a ground part for preventing the PCB
4
from a static electricity, and a plate
3
installed at the inside of the top case
2
to contact the PCB
4
with the ground part of the top case
2
.
The PCB
4
is mounted with a driving circuitry for applying a data signal and a scanning signal, etc. to the liquid crystal display panel (not shown). The top case
2
plays a role to enclose the edge of the liquid crystal display panel. Also, the top case
2
is provided with a ground part as shown in
FIG. 3A
for preventing the PCB
4
from a static electricity generated upon assembly of circuit components or a static electricity generated at the interior of the system.
Referring to
FIG. 3A
, the top case
2
consists of a horizontal plane part
18
and a vertical plane part
19
bent vertically from the horizontal plane part
18
. The inside of the vertical plane part
19
is provided with a copper film
12
, that is, a grounding part connected to a ground terminal (not shown). The plate
3
takes a shape as shown in
FIG. 3B
so as to contact the PCB
4
with the copper film
12
of the top case
2
.
Referring to
FIG. 3B
, the plate
3
includes a horizontal plane part
11
on which the PCB
4
is put, and a vertical supporting member
23
extended vertically and bent from one side thereof.
The horizontal plane part
11
is provided with a first screw hole
14
for fixing the PCB
4
. The vertical supporting member
23
is provided with at least one protrusion
10
to be in contact with the copper film
12
of the top case
2
. The plastic frame
82
in
FIG. 1
is inserted between the horizontal plane part
11
and the vertical supporting member
23
.
A static electricity generated from the driving circuitry mounted onto the PCB
4
contacts the copper film
12
of the top case
2
via the protrusion
10
provided at the vertical supporting member
23
of the plate
3
to flow into a ground terminal. In other words, the PCB
4
is in contact with the copper film
12
of the top case
2
via the plate
3
and grounded, thereby protecting the PCB
4
from a static electricity. This will be described in detail with reference to FIG.
4
A and FIG.
4
B.
FIG. 4A
is a section view taken along the line B-B′ line in
FIG. 2A
, and
FIG. 4B
is a section view taken along the line C-C′ line FIG.
2
B.
Referring to FIG.
4
A and
FIG. 4B
, the PCB
4
becomes in contact with the plate
3
and fixed by passing a first screw
17
through a hole (not shown) defined on the PCB
4
and through a first screw hole
14
of the plate
3
and then inserting it into a first screw hole
16
formed at the plastic frame
82
.
The plate
3
is fixed by passing a second screw (not shown) through a second screw hole (not shown) defined at the plate
3
and then inserting it into a second screw hole (not shown) defined at the plastic frame
82
. The outer side of the plate
3
is covered with the top case
2
. Accordingly, the protrusion
10
formed at the plate
3
is in contact with the copper film
12
formed at the inside of the top case
2
. As a result, the PCB
4
is earthed to the copper film
12
via the plate
3
, to thereby be protected from a static electricity generated upon assembly work and a static electricity generated from the interior of the system.
Further, the top case
2
covers the outer side of the PCB
4
and the plate
3
, etc. by engaging a third screw
28
to the plastic frame
82
through a third screw hole
26
shown in FIG.
2
A and FIG.
2
B. At this time, the top case
2
raises a problem in that it is widened toward the outside thereof by X as shown in
FIG. 5
when an engaging force of the third screw
28
is excessively strong.
This problem makes a grounding of the PCB
4
into the top case
2
impossible. Accordingly, the drivers (not shown) mounted onto the PCB
4
are damaged by a static electricity generated upon assembly work or a static electricity generated from the internal system. As a result, there occurs a problem in that a picture fails to be displayed on the liquid crystal display panel
80
due to such a damage of the drivers mounted onto the PCB
4
.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a liquid crystal display module that is adaptive for improving a ground connection between a printed circuit board and a ground plate.
In order to achieve these and other objects of the invention, a liquid crystal display module according to an embodiment of the present invention includes a printed circuit board for applying signals to a liquid crystal display panel; a top case provided with a horizontal plane part and a vertical plane part bent vertically from the horizontal plane part to enclose the edge of the liquid crystal display panel; and a ground plate provided with an outer vertical supporting member being in contact with the outside of the vertical plane part of the top case to earth the printed circuit board.
In the liquid crystal display module, the top case includes a concave portion that is concavely defined at one side of the vertical plane part to be in contact with the outer v
Hwang Jae Ho
Park Jong Dae
Gandhi Jayprakash N.
LG. Philips LCD Co. Ltd.
Morgan & Lewis & Bockius, LLP
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