Liquid crystal cells – elements and systems – Particular structure – Holder – support – frame – or housing
Reexamination Certificate
2002-04-26
2003-06-24
Kim, Robert H. (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Holder, support, frame, or housing
C349S149000
Reexamination Certificate
active
06583831
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of preventing a ground clip from making contact with a display unit due to a deformation of the ground clip that is combined with an end of a mold frame to ground a printed circuit board to a top chassis.
2. Description of the Related Art
Recently, an information process device such as a computer has been rapidly improved as the information technology industry has been developed. In addition, this technological development has affected an improvement of a monitor device displaying information output from the information process device.
The aforementioned monitor device generally is divided into a cathode ray tube type of monitor device, using a characteristic of a cathode ray tube, and a liquid crystal display unit type of monitor device, applying physical and optical characteristics of liquid crystals. The liquid crystal display unit type of the monitor device has characteristics of being small in size and light in weight, and less consumption power. Accordingly, the liquid crystal display unit type of the monitor device is widely used as a display device of a lap-top top computer, a monitor of a desk-top computer and a monitor of a high-quality television receiver.
FIG. 1
is an exploded perspective view schematically showing the conventional liquid crystal display device and
FIG. 2
is a plan view of a position of a ground clip for grounding a printed circuit board to a top chassis of the liquid crystal display device shown in FIG.
1
. Also,
FIGS. 3 and 4
show a combination construction of the liquid crystal display device shown in FIG.
1
.
Referring to
FIG. 1
, the liquid crystal display device
100
has a liquid crystal display module
130
for displaying images when image signals are applied thereto, and front case
110
and rear case
120
for receiving the liquid crystal display module
130
. The liquid crystal display module
130
includes a display unit
170
having a liquid crystal display panel for showing the images and a backlight assembly
150
for supplying a light to the display unit
170
.
The display unit
170
has a liquid crystal display panel
171
, a data side printed circuit board
176
, a gate side printed circuit board
175
, a data side tape carrier package
178
and a gate side tape carrier package
174
.
The liquid crystal display panel
171
includes a thin film transistor board
172
, a color filter board
173
and liquid crystal (not shown).
The thin film transistor board
172
is a transparent glass board on which the thin film transistors are formed in a matrix shape. Data lines are respectively connected with source terminals of the thin film transistors and gate lines are connected with gate terminals of the thin film transistors. Furthermore, pixel electrodes are respectively formed at drain terminals of the thin film transistors, which are made of a transparent conductive material such as Indium Tin Oxide (ITO).
The color filter board
173
is provided to face towards the thin film transistor board
172
. RGB pixels are formed on the color filter board
173
by means of a thin film process, which presents a predetermined color while the light passes through the color filter board
173
. Common electrodes made of ITO are coated on the front surface of the color filter board
173
.
When the power source is applied to the gate terminals and to the source terminals of the transistors on the thin film transistor board
172
, to turn on the thin film transistors, an electric field is created between the pixel electrodes of the thin film transistor board
172
and the common electrodes of the color filter board
173
. The electric field changes the array angle of liquid crystal, which is injected between the thin film transistor board
172
and the color filter board
173
. This changes the transmissivity of the light and shows the desired pixel images.
Meanwhile, a driving signal and a timing signal are applied to the gate lines and to data lines of the thin film transistors in order to control the array angle of the liquid crystal and the time of arraying the liquid crystal in the liquid crystal display panel
171
. As shown in
FIG. 1
, the data side tape carrier package
178
, which is made of flexible circuit boards, is attached to the source portion of the liquid crystal display panel
171
to determine a data driving signal timing. On the other hand, the gate side tape carrier package
174
is attached to the gate portion of the liquid crystal display panel
171
for a gate driving signal timing.
The data side printed circuit board
176
and the gate side printed circuit board
175
, which respectively apply the driving signal to the gate line and to the data line as soon as receiving image signals input from outside of the liquid crystal display panel
171
, makes contact with the data side tape carrier package
178
for the data line and the gate side tape carrier package
174
for the gate line in the liquid crystal display panel
171
, respectively. A source portion is formed on the data side printed circuit board
176
in order to receive the image signals from an information process device (not shown) such as a computer, etc. and then to provide the gate driving signal for the gate line of the liquid crystal display panel
171
. Also, a gate portion is formed on the gate side printed circuit board
175
to provide the gate driving signal to the gate lines of the liquid crystal display panel
171
. That is, the data side printed circuit boards
176
and the gate side printed circuit board
175
generate and apply the gate driving signal and the data signal for driving the liquid crystal display device. They also generate a plurality of timing signals for applying the gate driving signal and the data signal to the gate lines and the data lines of the liquid crystal display panel
171
, so as to provide the gate driving signal through the gate side tape carrier package
174
to the gate lines of the liquid crystal display panel
171
and to supply the data signal through the data side tape carrier package
178
to the data lines of the liquid crystal display panel
176
.
A backlight assembly
150
is provided under the display unit
170
to uniformly supply the light to the display unit
170
. The backlight assembly
150
includes a lamp unit
160
, which is disposed at an end of the liquid crystal display module
130
, for generating the light, a light guide plate
152
for guiding the light emitted from the lamp unit
160
toward the display unit
170
and changing a pathway of the light, a plurality of optical sheets
153
for adjusting a brightness of the light transmitted from the light guide plate
152
uniformly and a light reflecting plate
151
that is provided under the light guide plate
152
for reflecting the light leaking from the light guide plate
152
so as to improve the efficiency of the light.
The display unit
170
and the backlight assembly
150
are supported by a mold frame
131
, that receives the light reflecting plate
151
and is used as a receiving container, and a top chassis
140
is provided to prevent the display unit
171
from departing from the mold frame
131
.
As shown in
FIG. 2
, a ground clip
133
is combined to an end of the mold frame
131
that receives the display unit
171
in order to ground the data side printed circuit board
176
. The ground clip
133
electrically connects the data side printed circuit board
176
to the top chassis
140
.
Referring to
FIG. 3
, the mold frame
131
receives the light reflecting plate
151
, the light guide plate
152
and the optical sheets
153
in that order. The display unit
170
is placed on the optical sheets
153
so as to partially overlap the mold frame
131
. The ground clip
133
is mounted to enclose an end of the mold frame
131
. The ground clip
133
extends from an upper surface of the end of the mold frame
131
to the printed circuit board
176
Duong Thoi
Kim Robert H.
Park Hae-Chan
Samsung Electronics Co,. Ltd.
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