Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2001-07-10
2004-05-18
Niebling, John F. (Department: 2812)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
Reexamination Certificate
active
06738118
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a liquid crystal display device. More particularly, the present invention relates to a liquid crystal display device having a visual field angle while being capable of restraining or relaxing a gray scale inversion.
2. Description of the Related Art
Generally, the liquid crystal display device applies voltage to the liquid crystal in predetermined molecule arrays to change the liquid crystal in the other arrays, of which the liquid crystal cells undergoes a change of optical characteristics such as a double refractivity, a rotatory polarization, a dichroism and a light scattering according to the molecule arrays of the liquid crystal to emit the light. Therefore, the liquid crystal display device can display the images according to the changes of the optical characteristics of the liquid crystal cell.
The liquid crystal display device is typically divided into a twisted nematic type of the liquid crystal display device and a super twisted nematic type of the liquid crystal display device. According to an operation way, further, the liquid crystal display device is divided into an active matrix display way of the liquid crystal display device using switching elements and twisted nematic liquid crystal and a passive matrix display way of the liquid crystal display device using super twisted nematic liquid crystal.
There is a difference of the active matrix display type of the liquid crystal display device and the passive matrix display way of the liquid crystal display device in that the liquid crystal display device in the active matrix display way uses a thin film transistors as switches to operate liquid crystal while the liquid crystal display device in the passive matrix display way does not use transistors as it does not requires complex circuits. The liquid crystal display device using the thin film transistor is widely used as a lap top computer recently is popularized.
The liquid crystal display device comprises a liquid crystal display panel having liquid crystal to decide whether to transmit light as receiving electric signals. The liquid crystal display panel is a passive element that does not generates the light by itself. Accordingly, a backlight assembly is attached to a surface of the liquid crystal display panel in order to provide the light to the liquid crystal display device. Furthermore, the liquid crystal display panel has a source portion for applying image data to display images and a gate portion for applying gate signals to operate a gate element of the thin film transistor in the liquid crystal display panel, which are attached to the liquid crystal display panel. The liquid crystal in the liquid crystal display panel receives the electric signals when image signals are applied through the source portion and the gate portion to the transistor of the liquid crystal display panel. Thereby, the liquid crystal controls the light from the backlight assembly to make the images.
FIG. 1
is an exploded perspective view of showing a liquid crystal display device according to the conventional art and
FIG. 2
is a sectional view of showing a liquid crystal display module of the liquid crystal display device in an assembled state, shown in FIG.
1
.
Referring to
FIGS. 1 and 2
, the liquid crystal display device
100
comprises a liquid crystal display module
200
for displaying images when image signals are applied thereto and front and rear cases
300
and
400
for receiving the liquid crystal display module.
The liquid crystal display module
200
includes a display unit
210
having a liquid crystal display panel for showing the images.
The display unit
210
includes a liquid crystal display panel
212
, an integrated and printed circuit board
214
, a tape carrier package
216
for date and a ductile printed circuit board
218
for gate. The liquid crystal display panel
212
includes a thin film transistor board
212
a
, a color filter board
212
b
and liquid crystal (not shown).
The thin film transistor board
212
a
is a transparent glass on which the thin film transistors are formed in matrix. Data lines are respectively connected with source terminals of the thin film transistors and gate lines 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.
As being inputted to the data lines and the gate lines, the electric signals are applied to the source terminals and the gate terminals of each thin film transistor of the thin film transistor board
212
a
to turn on or turn off the thin film transistors according to an input of electricity, resulting in outputting the electric signals required to form pixels to the drain terminals.
The color filter board
212
b
is disposed to face to the thin film transistor board
212
a
in the display unit
210
. RGB pixels are formed on the color film board
173
by means of a thin film process, which present a predetermined color while the light passes through the color film board
212
b
. Common electrodes made of Indium Tin Oxide are coated on the front surface of the color film board
212
b.
The color filter board
212
b
has a compensatory film
213
and a polarizing plate
215
formed on an upper portion to improve a visual field angle.
When the thin film transistors of the thin film transistor board
212
a
are turned on by applying electricity to the gate terminals and the source terminals of the thin film transistors, electric field is created between the pixel electrodes of the thin film transistor board
212
a
and the common electrodes of the color filter board
212
b
. The electric field makes the liquid crystal, which is injected in a space between the thin film transistor board
212
a
and the color filter board
212
b
, to change the array angle thereof, resulting in that the permeability of the light is changed. As a result, it is possible to gain the desired pixels.
Meanwhile, a driving signal and a timing signal are applied to the gate lines and data lines of the thin film transistor 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
212
. As shown in
FIG. 1
, the data tape carrier package
216
is attached to the source portion of the liquid crystal display panel
212
to decide a time of applying a data driving signal. On the other hand, the gate tape carrier package
218
is attached to the gate portion of the liquid crystal display panel
212
to decide a time of applying a gate driving signal.
The integrated and printed circuit boards
214
which applies the driving signal to the gate line and the data line as soon as receiving image signals inputted from outside of the liquid crystal display panel
212
, comes in contact with the data tape carrier package
216
. The integrated and printed circuit board
214
receives the image signals provided from an information process device (not shown) such as a computer and the like and generates the gate driving signal and the data signal for operating the liquid crystal display device and 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
212
.
The backlight assembly
220
is disposed under the display unit
210
to supply the light to the display unit
220
uniformly. The backlight assembly
220
includes a line typed lamp
222
which is disposed at an end of a liquid crystal display module
200
, for generating the light.
A light guide plate
224
has a size corresponding to that of the liquid crystal display panel
212
of the display unit
210
and has a thickness which is gradually reduced from an end adjacent to the lamp
222
to the other end being far away from the lamp
222
. The light guide plate
224
is disposed under the liquid crystal display panel
212
so as to guide the
Hwang In-Sun
Kim Sang-Il
Nobuyuki Yamamura
McGuireWoods LLP
Stevenson Andre′ C.
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