Liquid crystal cells – elements and systems – Nominal manufacturing methods or post manufacturing...
Reexamination Certificate
2000-11-22
2003-07-15
Ton, Toan (Department: 2871)
Liquid crystal cells, elements and systems
Nominal manufacturing methods or post manufacturing...
C349S153000, C349S155000
Reexamination Certificate
active
06593993
ABSTRACT:
This application claims the benefit of Korean Patent Application No. 1999-53023, filed on Nov. 26, 1999, which is hereby incorporated by reference for all purposes as if fully set forth herein.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a liquid crystal display (LCD) device, and more particularly, to a large-scale liquid crystal display device having a color filter.
2. Discussion of the Related Art
A liquid crystal display device conventionally includes both display and pad portions. The pad portion includes driving circuits that transmit signals to the display portion. The display portion then displays images. The display portion includes upper and lower substrates with a liquid crystal interposed therebetween.
FIG. 1
shows a liquid crystal panel
10
of a typical color LCD device. As shown, upper and lower substrates
12
and
18
oppose each other and a liquid crystal
20
is interposed therebetween. On the upper substrate
12
are a color filter
14
and a transparent common electrode
16
. The lower substrate
18
, often called an array substrate, includes a plurality of switching devices
22
and a plurality of pixels
24
. The size of each pixel
24
relates to the resolution of the liquid crystal display device, while the size of the liquid crystal display device itself depends both on the size and on the number of the pixels
24
.
On the lower substrate
18
are a plurality of gate lines
26
and data lines
28
that are arranged in a matrix fashion. A pixel area is defined by adjacent gate and data lines. In each pixel
24
is a pixel electrode
30
that is comprised of a transparent conductive material. Between the pixel electrodes and the common electrode
16
is the liquid crystal
20
. The switching devices
22
, positioned near cross points of the gate and data lines
26
and
28
in each pixel
24
, selectively apply an electric voltage across the electrodes. The switching devices
22
are usually thin film transistors (TFTs).
As shown in
FIG. 2
, gate driving circuits
42
and data driving circuits
44
are positioned adjacent the liquid crystal panels
10
of TFT LCD devices
40
. The gate driving circuits
42
transmit scanning signals to the gate lines
26
(see FIG.
1
), while the data driving circuits
44
transmit data signals to the data lines
28
(see FIG.
1
).
The above-described liquid crystal display device beneficially has a large display area. Conventionally, to make a large liquid crystal display multiple small-sized array substrates are independently fabricated and interconnected.
FIGS. 3
,
4
A,
4
B, and
5
illustrate a conventional method for fabricating large liquid crystal display devices.
As shown in
FIG. 3
, a first liquid crystal panel
56
includes upper and lower substrates
50
and
52
that are attached to each other via sealants
54
, while a second liquid crystal panel
64
also includes upper and lower substrates
58
and
60
that are attached to each other via sealants
62
.
The liquid crystal panels
56
and
64
are then cut down the center axes of the sealants
54
and
62
, respectively.
FIG. 4A
shows the liquid crystal panels
56
and
64
after cutting. In the liquid crystal panels
56
and
64
, halves of the sealants
54
a
and
62
a,
respectively, remain. For the sake of convenience, only one sealant of each panel is shown as being cut. However, two or four surfaces of the liquid crystal panels are usually cut in an actual fabrication process.
Next, as shown in
FIG. 4B
, the liquid crystal panels
56
and
64
are attached to each other via a black sealant
68
such that the cut surfaces of the sealants
54
a
and
62
a
oppose each other. The upper substrates
50
and
58
then make an enlarged display area.
Finally, as shown in
FIG. 5
, upper and lower supporting substrates
74
and
76
that have sizes that correspond to those of the enlarged upper and lower substrates
70
and
72
are, respectively, attached to outer surfaces of the enlarged upper and lower substrates
70
and
72
. This completes the large-scale liquid crystal display device
80
. Though two supporting substrates
74
and
76
are shown as supporting the enlarged substrates
70
and
72
, the actual number of supporting substrates are not necessarily fixed.
In the conventional large-scale liquid crystal display device, to prevent light leakage through gaps that might form between the attached sealants
54
a
and
62
a
(see
FIG. 4B
) a sufficiently large black matrix should cover the attached sealants. This decreases the aperture ratio of the completed liquid crystal display device. Furthermore, since each of the liquid crystal panels is independent, there is a lack of display uniformity. Finally, additional parts, such as the supporting substrates, are required.
SUMMARY OF THE INVENTION
Accordingly, the principles of the present invention are directed to a method for fabricating large scale liquid crystal display devices that substantially obviates one or more of the limitations and disadvantages of the related art.
An object of the present invention is to simplify the fabricating process of large-scale liquid crystal display devices.
It is another object of the present invention to stabilize the cell gaps of large-scale liquid crystal display devices.
Additional features and advantages of the invention will be set forth in the description that follows, and in part will be apparent from that 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, there is provided a fabricating method that includes preparing a first substrate and a plurality of second substrates that are smaller than the first substrate; forming a switching device on each of the second substrates; forming a plurality of spaced apart black matrices on the first substrate; forming a plurality of color filters on the first substrate, each color filter being surrounded by black matrices; forming a transparent conductive electrode on the color filters; forming a supporting rib on the transparent conductive electrode; forming a first orientation film over the first substrate such that the first orientation film covers the transparent conductive electrode and the supporting rib; locating sealants on edges of the first substrate such that the sealants surround the first orientation film; forming a second orientation film on each of the second substrates such that the second orientation film covers the switching device; and attaching the second substrates to the first substrate via the sealants such that the supporting rib supports the second substrates such that the second substrates are separated by a constant cell spacing.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
REFERENCES:
patent: 6181405 (2001-01-01), Izumi
patent: 6437847 (2002-08-01), Kishimoto
Akkapeddi P. R.
LG. Philips LCD Co. Ltd.
McKenna Long & Aldridge LLP
Ton Toan
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