Structure for preventing a liquid from permeating into a cell

Details Structure for preventing a liquid from permeating into a cell Structure for preventing a liquid from permeating into a cell

2002-12-13

2004-12-21

Ngo, Huyen (Department: 2871)

Liquid crystal cells, elements and systems

Nominal manufacturing methods or post manufacturing...

Sealing of liquid crystal

C349S153000, C349S154000

Reexamination Certificate

active

06833902

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to a method for preventing a liquid from permeating, and more particularly to a method for preventing a liquid from permeating into a cell which facilitates fabrication of a plurality of planels.
BACKGROUND OF THE INVENTION
Generally, when a container has to be processed in a liquid without being permeated thereby, a sealing for an outlet of the container is always necessary.
Please refer to FIGS.
1
A~
1
B which illustrate a mechanical sealing method in the prior art. In some conditions, two liquid crystal substrates
10
(it only shows one liquid crystal substrate
10
in
FIG. 1A
) which are adhered to be opposed in parallel to each other to form a container
12
have to be thinned by a chemical etching or a Chemical Machine Polishing (CMP), thus the container
12
including a cell
11
needs to prevent a liquid
13
(especially a hydrofluoric acid, HF used in the chemical etching) from permeating into the cell
11
(between the two liquid crystal substrates
10
). That means a layer or more dummy seal
14
must be coated around a periphery
15
of the substrate
10
for preventing the liquid
13
from permeating thereinto. Further, because a gas inside the container
12
must be exhausted through an exhaust
16
formed by the dummy seal
14
when assembling the two substrates
10
, the exhaust
16
will be sealed off by a sealing glue
17
after assembling.
Please refer to FIG.
1
C.
FIG. 1C
illustrates another sealing method for the exhaust
16
of the container
12
according to the prior art. In
FIG. 1C
, an obstructive seal
18
paralleled to the dummy seal
14
is utilized to form a narrow channel
19
inside the exhaust
16
for blocking and slowing down the liquid
13
, so that the time for the liquid
13
to permeate into the cell
11
will be extended. And please further refer to
FIG. 1D
which illustrates the third sealing method for the exhaust
16
according to the prior art. In
FIG. 1D
, a long seal
181
is utilized to from an extended channel
191
which will also increase the time for the liquid
13
to permeate into the cell. Thus, the extended channel
191
has a wider width than the narrow channel
19
in FIG.
1
C.
However, these three methods described above still have some cons. The first sealing off method will increase the complexity of the whole manufacturing processes. As to the second and third methods, for forming a narrow channel and an extended channel, although these methods can extend the permeation time of the liquid, these will also increase the exhausting time of the gas in the cell at the same time and then reduce the yield. Furthermore, even though these methods are introduced, the liquid will still permeate into the cell.
Because of the defects described above, the applicant keeps on carving unflaggingly to develop “method for preventing liquid from permeating” through wholehearted experience and research.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method for preventing liquid from permeating into a cell by printing a thickening film on an exhaust area of a substrate.
It is another object of the present invention to narrow and then increase an intermediate distance of the thickening films printed on the two substrates, so that a surface tension and capillarity will be utilized to resist the liquid to permeate into the cell.
According to an aspect of the present invention, a method for preventing liquid from permeating into a cell for facilitating fabrication of a plurality of planels includes steps of providing a first substrate having a first exhaust area and a plurality of first portions of the planels, providing a second substrate having a second exhaust area and a plurality of second portions of the planels, printing a plurality of orienting films on the plurality of first and second portions of the planels, printing a plurality of thickening films respectively on the first and the second substrates for narrowing an intermediate distance of the first and second exhaust areas to prevent the liquid from permeating into the cell therethrough, coating a dummy seal around a periphery of the second substrate for preventing the liquid permeating into the cell, and assembling the first and the second substrates for forming the cell.
Preferably, the plurality of planels are filled therebetween with a plurality of liquid crystal molecules.
Certainly, the plurality of liquid crystal molecules can be arranged in response to the plurality of orienting films between the plurality of planels.
Preferably, the method further includes a step of coating a frame seal around a periphery of the plurality of planels for filling the plurality of liquid crystal molecules between the plurality of planels.
Preferably, the plurality of thickening films are polymer films.
Preferably, the plurality of orienting films and the plurality of thickening films are made of a polyimide (PI) and are printed on the first and the second substrates.
Preferably, each of the plurality of thickening films has a slant end on an inner side thereof with respect to the cell for gradually increasing an intermediate distance of the plurality of thickening films respectively on the first and the second substrates, so that a surface tension and capillarity are utilized to prevent the liquid from permeating into the cell.
Certainly, the plurality of thickening films and a surface of the liquid can form an included angle &thgr;
c
, and a surface on the slant end and a horizontal plane of the plurality of thickening films can form an included angle &bgr;.
Certainly, the included angle &bgr; can be greater than (&pgr;/2−&thgr;
c
).
Preferably, the first and the second substrates are LCD (Liquid Crystal Display) substrates, and the liquid is a HF (hydrofluoric acid) for proceeding a chemical etching process to reduce a weight of the LCD substrate.
Preferably, the first substrate is a TFT (Thin Film Transistor) substrate.
Preferably, the second substrate is a CF (Color Filter) substrate.
In accordance with another aspect of the present invention, a method for preventing a liquid from permeating into a cell for facilitating fabrication of a plurality of planels includes steps of providing a first substrate having a first encircling exhaust area and a plurality of first portions of the planels, providing a second substrate having a second encircling exhaust area and a plurality of second portions of the planels, printing a plurality of polyimides on the plurality of first and second portions of the planels, printing a plurality of encircling thickening films respectively on the first and the second substrates for narrowing an intermediate distance of the encircling exhaust areas to prevent the liquid from permeating into the cell therethrough, and assembling the first and the second substrates for forming the cell.
Preferably, the method further includes a step of coating a frame seal around a periphery of the plurality of planels for filling the plurality of liquid crystal molecules between the plurality of planels.
Preferably, the plurality of encircling thickening films are rectangular circles disposed at the encircling exhaust areas.
Preferably, each of the plurality of encircling thickening films has an inner slant circle thereof with respect to the cell for gradually increasing an intermediate distance of the plurality of thickening films respectively on the first and the second substrates, so that a surface tension and capillarity are utilized to prevent the liquid from permeating into the cell.
Certainly, the plurality of encircling thickening films and a surface of the liquid can form an included angle &thgr;
c
, and a surface on the slant circle and a horizontal plane of the plurality of encircling thickening films can form an included angle &bgr;.
Certainly, the included angle &bgr; can be greater than (&pgr;/2−&thgr;
c
).
In accordance with a further aspect of the present invention, a structure for preventing a liquid from permeating into a cell with an exhaust outlet includes a fi

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