Liquid crystal cells – elements and systems – Particular structure – Holder – support – frame – or housing
Reexamination Certificate
2000-12-11
2004-07-13
Schechter, Andrew (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Holder, support, frame, or housing
Reexamination Certificate
active
06762807
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 that can minimize the size of the liquid crystal display device by modifying the structure of a receptacle assembly for receiving a back light assembly and a display unit of the liquid crystal display device.
2. Description of the Related Art
Recently, information processing devices have been developed so as to have various shapes, various functions, and rapid information processing speeds. The information which has been processed by such an information processing device has electrical signals. A display device that functions as an interface is usually used for confirming the information processed by the machine with the naked eye.
Recently, a liquid crystal display device has developed to be lighter and smaller than a display device of a CRT type and to have full spectrum of colors and high resolutions. As the result, a liquid crystal device has been widely used as a monitor of a computer, a television, and a display device of another information processing device.
A liquid crystal display device applies a voltage to an electrode to change the molecular arrangement of the liquid crystal layer. The liquid crystal display device changes the optical properties of liquid crystal layers that pass light according to the molecular arrangement, and uses the modulation of the light of the liquid crystal cells.
Liquid crystal display devices can be categorized into a TN (Twisted Nematic) type and an STN(Super-Twisted Nematic) type. Further, liquid crystal display devices can also be categorized into an active matrix display type that uses a switching device and a TN liquid crystal and a passive matrix display type that uses an STN liquid crystal according to the driving methods.
The active matrix display type is used in a TFT-LCD, and drives an LCD by using a TFT as a switch. The passive matrix display type does not use any transistors, and thus does not need complex circuits that are related to a transistor.
Further, according to the light source, liquid crystal display devices are categorized into a transmission-type liquid crystal display device that uses a back light and a reflection-type liquid crystal display device that uses an exterior light source.
The transmission-type liquid crystal display unit is heavy and voluminous because of the back light, but is widely used because it can be used anywhere without considering the ambient light.
FIG. 1
is an exploded perspective view for showing a conventional liquid crystal display device.
FIG. 2
is a cross-sectional view for showing the assembled liquid crystal display device of FIG.
1
.
Referring to
FIGS. 1 and 2
, the liquid crystal display device
600
comprises a liquid crystal display module
700
for displaying a screen by applying a video signal, and a front case
800
and a rear case
900
that receive the liquid crystal display module
700
.
The liquid crystal display module
700
comprises a display unit
710
that comprises a liquid crystal display panel. The display unit
710
comprises a liquid crystal display panel
712
, an integrated printed circuit board
714
, a data side tape carrier package
716
, and a gate side flexible circuit board
718
which is manufactured by a COF method.
The liquid crystal panel
712
comprises a thin film transistor substrate
712
a
, a color filter substrate
712
b
, and a liquid crystal layer therebetween (not shown).
The thin film transistor substrate
712
a
is a transparent glass substrate in which thin film transistors of the matrix type are formed. A data line is connected to source terminals of the thin film transistors, and a gate line is connected to gate terminals. A pixel electrode of indium tin oxide (ITO), which is transparent conductive material, is formed in the drain terminal.
If electrical signals are inputted to the data line and the gate line, the electrical signals are inputted to the source terminals and the gate terminals of the thin film transistors. The thin film transistors are turned on or off by the inputting of the electrical signals to the gate terminals. Then, the drain terminal outputs the electrical signals that are needed for showing images at the pixels.
The color filter substrate
712
b
is opposite to the thin film transistor substrate
712
a
. The color filter substrate is a substrate in which RGB pixels are formed by the thin film process. A common electrode of the ITO is coated on the front surface of the color filter substrate
712
b.
If a voltage is applied to the gate terminals and the source terminals of the transistors of the thin film transistor substrate
712
a
and the thin film transistors are turned on, an electric field is formed between a pixel electrode and the common electrode of the color filter substrate. The arrangement of liquid crystal injected between the thin film transistor substrate
712
a
and the color filter substrate
714
b
changes by the electric field, and the transmittance of light changes as the arrangement varies.
A driving signal and a timing signal are 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 panel
712
and the timing of when the liquid crystal is arranged. As shown in the figures, a tape carrier package
716
which is a sort of flexible circuit board for determining the data driving signal application time is attached to the source side of the liquid crystal display panel
712
, and a gate side flexible circuit board
718
which is manufactured by the COF method for determining the gate driving signal application time is attached to the gate side.
The integrated printed circuit board
714
for receiving the video signals from the outside of the liquid crystal panel
712
and for applying the driving signals to the gate line and the data line is connected to the 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 video signals generated in an exterior information processing device (not shown) is applied to provide 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
. 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 gate driving signals and the data signals. The gate driving 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
712
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 linear lamp
722
for generating the light. The linear lamp
722
is provided on one side of the liquid crystal display module
700
. A light guide plate
724
has a size corresponding to the liquid crystal panel
712
, and is located under the liquid crystal panel
712
. The lamp side of the light guide plate
724
is the thickest. The thickness gradually decreases as goes away from the lamp
722
. The light guide plate
724
guides the light generated in the lamp
722
towards the display unit
710
, and changes the passage of the light.
A plurality of optical sheets
726
for making the luminance of the light which is irradiated from the light guide plate
724
and goes towards the liquid crystal display panel
712
uniform is provided above the light guide plate. A reflection plate
728
provided under the light guide plate
724
reflects the light leaked from the light guide plate and improves the efficiency of the light. The display unit
710
an
Ha Jin-Ho
Kwon Yoon-Soo
Lee Ik-Soo
Oh Choong-Seob
Won Jong-Ho
McGuireWoods LLP
Samsung Electronics Co,. Ltd.
Schechter Andrew
LandOfFree
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