Liquid crystal cells – elements and systems – Particular structure – Holder – support – frame – or housing
Reexamination Certificate
2001-12-28
2004-06-15
Whitehead, Jr., Carl (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Holder, support, frame, or housing
C345S173000
Reexamination Certificate
active
06750927
ABSTRACT:
RELATED APPLICATION
The present application claims the benefit of Korean Patent Application No. P2000-84115 filed Dec. 28, 2000, under 35 U.S.C. §119.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a liquid crystal display, and more particularly, to a liquid crystal display (LCD) with an electric graphic input panel (EGIP).
2. Discussion of the Related Art
In general, an LCD is provided with a liquid crystal panel having liquid crystal injected between upper and lower glass substrates, polarization plates on both sides of the liquid crystal panel for polarizing a light, a light source for generating the light, and a light plate for supplying a back light to the liquid crystal panel to display an external picture signal.
The lower glass substrate of the liquid crystal panel is provided with a plurality of gate lines extending in one direction at fixed intervals, data lines formed perpendicular to the gate lines at fixed intervals to define pixel regions, a matrix of the pixel regions between the gate lines and the data lines, a pixel electrode in each of the pixel regions, and a thin film transistor (TFT) in each of the pixel regions and having a gate electrode connected to the corresponding gate line, a source electrode connected to the corresponding data line, and a drain electrode connected to the pixel electrode. The TFT is turned on/off in response to a signal on the gate line. The upper glass substrate is provided with a color filter layer, a black matrix layer, and/or a common electrode. The upper and lower glass substrates are bonded together with a gap between the two substrates, into which the liquid crystal is injected.
The foregoing LCD is also provided with a device called EGIP (Electric Input Graphic Panel) for displaying a picture and providing an electrical graphics signal to the displayed picture. An LCD system fitted with an EGIP POL will be explained.
FIG. 1
illustrates a section of a related art integrated type EGIP POL
12
, and
FIG. 2
illustrates a sectional view of a related art LCD with the EGIP POL of FIG.
1
.
Referring to
FIG. 1
, integrated type EGIP POL
12
according to the related art is provided with PET (Polyethylene terephthalate) films
1
and
2
bonded together with a gap therebetween, and a transparent electrode ITO
3
or
4
formed on the opposite su faces of the PET films
1
and
2
. There is a PVA (Polyvinyl Alcohol) film
5
under the lower PET film
2
for polarizing a light, a TAC (Triacetyl Cellulose) film
6
under the PVA film
5
for protecting the PVA film
5
from humidity and the like and a sliver line layer A/G
7
on the upper PET film
1
. In the above EGIP POL
12
, the PVA film
5
and the TAC film
6
are called as POL (Polarizer) collectively, and the PET films
1
and
2
and the A/G layer
7
are called as an EGIP film collectively.
A related art LCD with the EGIP POL of
FIG. 1
is illustrated in FIG.
2
.
As explained, the related art LCD with the EGIP POL is provided with a liquid crystal panel
11
having the upper and lower substrates and the liquid crystal layer therebetween, the integrated type EGIP POL
12
fitted on the liquid crystal panel
11
, a lower polarization plate
13
fitted under the liquid crystal panel
11
, and a top case
16
having a light plate
14
under the lower polarization plate
13
and a light source
15
for providing the light to the light plate
14
. The tope case
16
cases the integrated type EGIP POL
12
, the liquid crystal panel
11
, the lower polarization plate
13
, the light plate
14
, and the light source
15
. This related art LCD with the EGIP POL is identical to a general LCD if the EGIP POL
12
is removed. Accordingly, the related art LCD with the EGIP POL is a general LCD provided with the EGIP POL
12
all encased with the top case
16
.
The size of the EGIP POL
12
is the same as the size of the upper plate of the liquid crystal panel
11
. The EGIP POL
12
is provided with electrode wirings such as a four lined resistance film type as shown in
FIGS. 3A and 3B
to provide a touch panel function. For example, as shown in
FIG. 3A
, the transparent electrode ITO
3
attached to the upper PET film
1
as shown in
FIG. 1
has two silver (Ag) wirings X
1
and X
2
at opposite ends thereof in an X-axis direction. As shown in
FIG. 3B
, the transparent electrode ITO
4
attached to the lower PET film
2
has two silver (Ag) wirings Y
1
and Y
2
at opposite ends thereof in a Y-axis direction. Each silver wiring is formed in a dead space (approximately 2-3 mm) part of the LCD (
FIG. 2
) in one direction. Data can be applied to the LCD through the electrode wirings without a keyboard or a mouse and the LCD can display a picture signal and have a function of a touch panel. The touch panel of the four lined resistance film type requires two signal readings for detecting a position, i.e., one reading to read an X-axis value, and another reading to read a Y-axis value.
However, the foregoing related art LCD with the EGIP POL has the following problems.
First, although the top case
16
encasing the EGIP POL serving as the touch panel helps to reduce malfunctions and errors to the LCD, it is difficult to repair the EGIP if it becomes defective, because the repair is complicated since the top case needs to be disassembled to access the EGIP.
Second, the dead space of the LCD is limited to be below 2-3 mm because a larger dead space for providing an adequate wiring space reduces a display area. Therefore, the formation of the touch panel electrodes in the limited dead space results in a high probability of electric short occurrences between the touch panel electrodes.
Third, although the electrode wiring having a multi-lined resistance film type, rather than the four lined resistance film type, can provide a faster response, the limited dead space impedes formation of the electrode wiring having the multi-lined resistance film type in the LCD.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to an LCD with an EGIP that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide an LCD with an EGIP, which permits an easy repair of the EGIP and formation of five lined resistance film type wiring.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, a liquid crystal display with an EGIP (Electric Graphic Input Panel) according to an embodiment of the present invention includes the LCD having a liquid crystal panel, a light plate and a light source, a case for encasing the LCD, and an integrated type EGIP POL fitted over the liquid crystal panel and the case.
In one aspect of the present invention, there is provided an LCD with an EGIP, including a liquid crystal panel having a lower substrate with a dummy pad formed thereon, a light plate, and a light source for supplying a back light to the liquid crystal panel; a case for encasing the lower substrate of the liquid crystal panel, the light plate, and the light source; and an integrated type EGIP POL fitted over the liquid crystal panel and the case.
In another aspect of the present invention, there is provided an LCD with an EGIP including a separated POL, the LCD having a liquid crystal panel, a light plate and a light source, a case for encasing the separated POL and the LCD, and an EGIP film fitted over the separated POL and the case.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intend
Lim Joo Soo
Yu Hwan Seong
Birch & Stewart Kolasch & Birch, LLP
Jr. Carl Whitehead
LG. Philips LCD Co. LTD
Smoot Stephen W.
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