Illumination – Revolving
Reexamination Certificate
2001-09-17
2003-07-22
Cariaso, Alan (Department: 2875)
Illumination
Revolving
C362S561000, C362S581000, C349S065000
Reexamination Certificate
active
06595651
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 light guide device, and a liquid crystal display module and a liquid crystal display device having the light guide device, which can minimize the flowing of a light guide plate received in a mold frame by improving the structure of the light guide plate of the liquid crystal display device.
2. Description of the Related Art
Recently, an information processing device has been developed to have a various shape, a various function, and a rapid information processing speed. The information processed in the information processing device has an electrical signal. In order to confirm the information processed in the information processing device with the naked eye, a display device that is needed.
Recently, a liquid crystal display device which is lighter, and smaller than a CRT type display device has been developed. The liquid crystal display device now displays a full color spectrum in a high resolution. As a result, the liquid crystal display device is widely used as a computer monitor, a television receiver, and another display device.
The liquid crystal display device applies a voltage to a liquid crystal layer to change the molecular arrangement of the liquid crystal layer. The liquid crystal display device changes of optical properties in the liquid crystal and uses the modulation of a light by using a liquid crystal cell.
There are two kinds of liquid crystal display devices: TN (Twisted Nematic) method; and an STN (Super-Twisted Nematic) method. Also they can be grouped to an active matrix display method that uses a switching device and a TN liquid crystal, and a passive matrix display method which uses a STN liquid crystal according to the driving type.
The active matrix display method is used in a TFT-LCD and drives an LCD by using a TFT as a switch. The passive matrix display method does not use any transistor and does not need a complex circuit.
Further, liquid crystal display devices are grouped to a transmissive liquid crystal display device that uses a backlight and a reflecting liquid crystal display device that uses an exterior light source, according to a method for using a light source
The transmissive liquid crystal display device using the back light as a light source is relatively heavy and voluminous due to the back light, but is widely used since it does not use an exterior light source and displays independently.
FIG. 1
is an exploded perspective view schematically showing a conventional liquid crystal display device.
FIG. 2
is a partial exploded perspective view of the liquid crystal display device shown in FIG.
1
.
Referring to
FIG. 1
, the liquid crystal display device
900
has a liquid crystal display module
700
to which an image signals is applied to display the screen, and a front surface case
810
and a rear surface case
820
for receiving the liquid crystal display module
700
.
The liquid crystal display module
700
has a display unit
710
which includes a liquid crystal display panel for displaying the screen.
The display unit
710
has a liquid crystal display panel
710
, an integrated printed circuit board
714
, a data side tape carrier package
716
, and a gate side flexible circuit board
718
manufactured by the COF method.
The liquid crystal display panel
712
has a thin film transistor substrate
712
a,
a color filter substrate
712
b,
and a liquid crystal layer interposed therebetween (not shown).
The thin film transistor substrate
712
a
is a transparent glass substrate on which thin film transistors are formed in a matrix shape. Data lines are connected to source terminals of the thin film transistors, and gate lines are connected to gate terminals of the thin film transistors. Pixel electrodes of indium tin oxide (ITO), which is a transparent conductive material, are formed on drain terminals.
If electrical signals are inputted to the data lines and the gate lines, the electrical signals are inputted to the source terminals and the gate terminals of thin film transistors and the thin film transistors are turned on or off so that electrical signals for forming pixels are outputted to the drain terminals.
The color filter substrate
712
b
is attached to the thin film transistor substrate
712
a.
RGB pixels that pass light through to realize color display is formed on the color filter substrate
712
b
by a thin film process. A common electrode comprised of ITO is coated on the front surface of the color filter board
712
b.
If power sources are applied to the gate terminals and the source terminals of the transistors and the thin film transistors are turned on, an electric field is formed between the pixel electrode on the thin film transistor substrate and the common electrode on the color filter substrate. The arrangement angles of the liquid crystals injected between the thin film transistor board
712
a
and the color filter board
714
b
changes by the electric field, and the light passage changes due to the arrangement angle changes to obtain a desired pixel status.
A driving signal and a timing signal is applied to the gate line and the data line of the thin film transistor to control the arrangement of the liquid crystal of the liquid crystal display panel
712
and the timing when the liquid crystal is arranged. The data side tape carrier package
716
which is a kind of flexible circuit board determining the timing when the data driving signal is applied is attached to the source side of the liquid crystal display panel
712
, and the gate side flexible circuit board
718
manufactured by the COF method for determining the time at which the gate driving signal is applied is attached to the gate side of the liquid crystal display panel
712
.
The integrated printed circuit board
714
for receiving image signals from outside of the liquid crystal display panel
712
and applying driving signal to the gate line and the data line is connected to the data tape carrier package
714
of the data line side of the liquid crystal display panel
712
. The integrated printed circuit board
714
has a source portion to which the image signals generated in an exterior information processing device (not shown) such as a computer are applied to provided the data driving signals to the liquid crystal display panel
712
and a gate portion for providing the gate driving signals to the gate line of the liquid crystal display panel
712
. Namely, the integrated printed circuit board
714
generates the gate driving signals for driving the liquid crystal display device, the data signals, and a plurality of timing signals for applying the signals. The gate signals are applied to the gate line of the liquid crystal display panel
712
through the gate side flexible circuit board
718
, and the data signals are applied to the data line of the liquid crystal display panel
212
through the data tape carrier package
716
.
A back light assembly
720
for providing a uniform light to the display unit
710
is provided under the display unit
710
. The back light assembly
720
comprises a lamp
722
which is provided on one side of the liquid crystal display module
700
to generate the light. The lamp
721
is protected by a lamp cover
722
. A light guide plate
724
has a size corresponding to the liquid crystal display panel
712
of the display unit
710
, and is located under the liquid crystal display panel
712
. The lamp side of the light guide plate
724
is thicker than the other side, and guides the light generated in the lamp
722
towards the display unit
710
to change the passage of the light.
A plurality of optical sheets
726
for making the luminance of the light irradiated from the light guide plate
724
and passed towards the liquid crystal display panel
712
uniform are provided above the light guide plate
724
. A reflection plate
728
for reflecting the light leaking from the light guide plate
724
to increase the light efficiency is provided under the light g
Jeong Seung-Chul
Lee Sang-Duk
Cariaso Alan
McGuireWoods LLP
Samsung Electronics Co,. Ltd.
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