Liquid crystal cells – elements and systems – Nominal manufacturing methods or post manufacturing...
Reexamination Certificate
2002-07-10
2004-05-25
Chowdhury, Tarifur R. (Department: 2871)
Liquid crystal cells, elements and systems
Nominal manufacturing methods or post manufacturing...
C349S153000, C445S023000, C445S024000
Reexamination Certificate
active
06741319
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a process for separating substrates, and more particularly to a process for separating substrates in liquid crystal display.
BACKGROUND OF THE INVENTION
With the developments and improvements on display-related technology, a active-matrix liquid crystal display (AMLCD) seems to be more and more popular than before and even tends to become a main stream on the market. Nowadays a liquid crystal display is most popular display in all kinds of the active-matrix liquid crystal display (AMLCD). Because of the different requirements, there are many sizes of displays. For forming displays with different sizes, the process for separating LCD substrate into small LCD cell units, becomes a very important technology.
Please refer to
FIGS. 1 and 2
which are respectively the lateral view and front view showing a traditional method for cutting substrates. As shown in
FIG. 1
, an upper substrate
11
and a lower substrate
12
are made of glass substrates and combined together by seal
13
. In order to form a liquid crystal display in required size, the glass substrates
11
and
12
must be cut in required size correspondingly. Firstly, a scribing line
10
is formed on the lower substrate
12
by scribing the lower substrate
12
on a stage
15
with a diamond blade or a hard metal wheel made of Tungsten Carbide. Then, as shown in
FIGS. 1 and 2
, the upper substrate
11
is exerted an external force by a breaking bar
14
along the y-axis, thereby allowing the lower substrate
12
to be separated into two parts along the scribing line
10
. Finally, the upper substrate
11
and the lower substrate
12
are exchanged and the above-mentioned steps are repeated to treat with the upper substrate
11
so as to separate the upper substrate
11
into two parts. Accordingly, the glass substrates
11
and
12
are cut in required size.
Although the traditional method for cutting substrates can make the upper substrate
11
and the lower substrate
12
separated, it also leads lots of disadvantages including the following:
1. Particles, debris and dust are produced during the cut process.
2. Low throughput.
3. The mechanical scribing method would produce unavoidable micro-cracks, that results in the requirements of post-process such as grinding, beveling and cleaning process.
4. Vapor diffuses into the panel after the cleaning process.
5. The thickness of the substrate capable of being cut is limited.
Therefore, the traditional method still needs to be improved for the common uses of the active-matrix liquid crystal display (AMLCD).
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a process for separating substrates in liquid crystal display. The method comprises steps of providing a first substrate and a second substrate, the first and second substrates being combined together by seal, forming a scribing line on the first substrate, and separating the first substrate into at least two parts along the scribing line by exerting air pressure upon the second substrate.
In accordance with one aspect of the present invention, the first substrate and second substrates are the substrate pervious to light. Preferably the first and second substrates are glass substrates.
In accordance with another aspect of the present invention, the step of forming the scribing line on the first substrate is performed by a diamond blade, a hard metal wheel or a laser.
In accordance with another aspect of the present invention, the hard metal wheel is made of Tungsten Carbide.
In accordance with another aspect of the present invention, the air pressure is provided by an air nozzle, plural air nozzles, an air membrane or plural air membranes.
In accordance with another aspect of the present invention, the air membrane is fixed by a supporting frame.
In accordance with another aspect of the present invention, the supporting frame is a device moving along said scribing line.
In accordance with another aspect of the present invention, after the step of separating the first substrate into at least two parts, the method further comprises steps of making the first substrate and the second substrate exchanged, forming another scribing line on the second substrate, and separating the second substrate along another scribing line into at least two parts by exerting the air pressure upon the first substrate.
It is further an object of the present invention to provide a process for separating substrates in liquid crystal display. The process comprises steps of providing a first substrate and a second substrate, the first and second substrates being combined together by seal, forming a scribing line on the first substrate, providing an attaching medium on the second substrate, and separating the first substrate into at least two parts along the scribing line by exerting an external force upon the second substrate.
In accordance with another aspect of the present invention, the external force is provided by an air nozzle, plural air nozzles, an air membrane, plural air membranes, a breaking bar, a roller and plural rollers.
In accordance with another aspect of the present invention, the breaking bar has a vibratility.
In accordance with another aspect of the present invention, the breaking bar has at least one extending portion.
In accordance with another aspect of the present invention, the breaking bar has a contact portion made of polymer.
In accordance with another aspect of the present invention, the roller is fixed on a supporter.
In accordance with another aspect of the present invention, the supporter is a device moving along said scribing line.
In accordance with another aspect of the present invention, the attaching medium is a tape and/or a steel wire.
In accordance with another aspect of the present invention, the tape has one of flat-shape and arc-shape.
In accordance with another aspect of the present invention, the attaching medium is a tape and/or a steel wire encapsulated with a polymer sheath.
REFERENCES:
patent: 6010384 (2000-01-01), Nishino et al.
patent: 6013563 (2000-01-01), Henley et al.
patent: 6420678 (2002-07-01), Hoekstra
patent: 05088136 (1993-04-01), None
Chuang Ta-Ko
Tanaka Sakae
Di Grazio Jeanne Andrea
Hannstar Display Corp.
Mathews, Collins Shepherd & McKay, P.A.
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