Liquid crystal cells – elements and systems – Particular structure – Holder – support – frame – or housing
Reexamination Certificate
2002-02-08
2003-12-23
Chowdhury, Tarifur R. (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Holder, support, frame, or housing
C349S062000, C349S063000, C349S065000, C362S035000
Reexamination Certificate
active
06667780
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a liquid crystal display apparatus, and more particularly to a liquid crystal display apparatus which is reduced in an overall size and a weight thereof.
2. Description of the Related Art
Recently, information processing devices have rapidly developed to have various shapes and functions with an enhanced data processing speed. In such information processing devices, information processed in the form of an electric signal requires a display device as an interface.
A liquid crystal display apparatus having a light weight and a compact size as compared with a CRT type display device has been developed to achieve full-color and high-resolution performance capabilities. Generally, the liquid crystal display apparatus displays an image according to changes in an arrangement of liquid crystal molecules when a voltage is applied to a liquid crystal cell. Visual properties of the liquid crystal display apparatus mainly depend on optical properties, such as birefringence, optical linearity, dichroism and light scattering features, of liquid crystal cells.
FIG. 1
is an exploded perspective view schematically showing a conventional liquid crystal display apparatus, and
FIG. 2
is a sectional view showing an assembled structure of the liquid crystal display apparatus shown in FIG.
1
.
Referring to
FIG. 1
, the liquid crystal display apparatus
100
includes a liquid crystal display module
130
for displaying an image upon receiving an image signal, and front and rear cases
110
and
120
for receiving the liquid crystal display module
130
therein. The liquid crystal display module
130
includes a display unit
170
having a liquid crystal display panel for displaying the image and a backlight assembly
150
for providing light to the display unit
170
.
The display unit
170
has a liquid crystal display panel
171
, data and gate printed circuit boards
176
and
175
, and data and gate tape carrier packages
178
and
174
.
The liquid crystal display panel
171
includes a thin film transistor substrate
172
, a color filter substrate
173
and a liquid crystal (not shown).
The thin film transistor substrate
172
includes a transparent glass substrate on which thin film transistors are formed in a matrix form. Source terminals of the thin film transistors are connected with data lines, and gate terminals are connected with gate lines thereof. Drain terminals are formed with a pixel electrode formed of a transparent conductive material such as Indium-Tin-Oxide (ITO).
The color filter substrate
173
is disposed facing the thin film transistor substrate
172
. RGB pixels, which are color pixels for emitting predetermined colors when the light passes therethrough, are formed on the color filter substrate
173
. A common electrode formed of ITO is coated on an entire surface of the color filter substrate
173
.
When a power is applied to the gate terminal and the source terminal of the thin film transistor formed on the thin film transistor substrate
172
, and the thin film transistor is turned on, an electric field is generated between the pixel electrode and the common electrode of the color filter substrate
173
. The electric field varies an aligning angle of the liquid crystal injected between the thin film transistor substrate
172
and the color filter substrate
173
. Accordingly, the light transmission is varied according to the variation of the aligning angle of the liquid crystal, so a desired image can be displayed. In addition, in order to control the aligning angle and the aligning timing of the liquid crystal in the liquid crystal display panel
171
, a driving signal and a timing signal are applied to the gate and data lines of the thin film transistor.
The backlight assembly
150
is provided below the display unit
170
and uniformly supplies the light into the display unit
170
. The backlight assembly
150
includes lamp units
161
and
162
at opposite ends of the liquid crystal display module
130
and generates the light. The backlight assembly
150
further includes a light guiding plate
152
for changing a path of the light while guiding the light to the display unit
170
, a plurality of optical sheets
153
for enhancing uniformity of a brightness of the light emitted from the light guiding plate
152
, and a reflecting plate
154
which is disposed below the light guiding plate
152
to reflect the light leaked from the light guiding plate
152
to the light guiding plate
152
, thereby improving the optical efficiency.
The display unit
170
and the backlight assembly
150
are sequentially received in a mold frame
132
, which is received in a bottom chassis
134
. In order to prevent the display unit
170
from being separated from the mold frame
132
, a top chassis
140
is coupled to the bottom chassis
134
.
Then, a shield case (not shown) may be installed at a rear portion of the bottom chassis
134
for shielding electromagnetic waves from an inverter circuit (not shown), which supplies a power to the liquid crystal display module
130
. The front case
110
is coupled to the rear case
120
to complete an assembly of the liquid crystal display apparatus.
As shown in
FIG. 2
, the lamp units
161
and
162
and the light guiding plate
152
are completely received in a receiving space of the mold frame
132
. A sidewall of the mold frame
132
is outwardly positioned with respect to the lamp units
161
and
162
, so that the lamp units
161
and
162
and the light guiding plate
152
are prevented from moving in the receiving space.
However, the above-mentioned conventional liquid crystal display apparatus has following disadvantages.
Firstly, a width of the liquid crystal display apparatus, that is, a width of opposite ends of the liquid crystal display apparatus for receiving the lamp units
161
and
162
is increased by the sum of thickness t
1
and t
2
of the sidewalls of the mold frame
132
. Therefore, an overall width of the liquid crystal display apparatus is remarkably enlarged.
In addition, since the outer portion of the lamp units
161
and
162
is covered with the mold frame
132
having a low thermal conductivity, the heat generated from the lamp units
161
and
162
is not easily discharged.
SUMMARY OF THE INVENTION
The present invention remedies the above problems of the prior art in that the invention provides a liquid crystal display module which is reduced in an overall size and a weight thereof.
The invention further provides a liquid crystal display apparatus which is reduced in an overall size and a weight thereof.
Firstly, there is provided a liquid crystal display module having a light generating section for generating a light. A light guiding plate guides the light to a displaying section for displaying an image. A container receives the light generating section and the light guiding plate. A guide member is coupled to first opposite ends of the container for guiding the light generating section and the light guiding plate to receiving positions in the container. The light generating section is placed on at least one end of second opposite ends of the container, the second opposite ends being perpendicular to the first opposite ends of the container. The light generation section directly contacts sidewalls of the second opposite ends of the container.
Secondly, there is provided a liquid crystal display apparatus having a light generating section for generating a light. A light guiding plate guides the light and a brightness improving section improves a brightness of the light emitted from the light guiding plate. A container receives the light generating section, the light guiding plate and the brightness improving section. A guide member is coupled to first opposite ends of the container for guiding the light generating section, light guiding plate and brightness improving section to receiving positions in the container. A fixing section is disposed above the brightness improving section and coupled with the container and th
Cantor & Colburn LLP
Chowdhury Tarifur R.
Samsung Electronics Co,. Ltd.
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