Electric lamp and discharge devices – With luminescent solid or liquid material – Vacuum-type tube
Reexamination Certificate
2000-04-28
2002-06-18
Patel, Vip (Department: 2879)
Electric lamp and discharge devices
With luminescent solid or liquid material
Vacuum-type tube
C313S635000, C313S479000
Reexamination Certificate
active
06407501
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a flat display, and more particularly, to a sealing area of a flat display in which an acryl-type moisture-resistant coating layer is formed on the surface of a frit glass exposed to the air.
2. Description of the Related Art
Generally, flat displays include plasma display panels (PDPs), liquid crystal displays (LCDs), vacuum fluorescent displays (VFD), electroluminescent (EL) displays and field emission displays (FEDs). In PDPs, a gas is injected into cells formed between two substrates having transparent electrodes of a predetermined pattern before sealing the cells, a discharge voltage is applied to the sealed cells, and ultraviolet rays generated due to the discharge voltage excite phosphors formed in a predetermined pattern, thereby displaying desired numerals, characters or graphics.
As shown in
FIG. 1
, a PDP includes a front substrate
11
and a rear substrate
12
. Common electrodes
13
and scanning electrodes
14
are formed on the bottom surface of the front substrate
11
in a stripe pattern. Bus electrodes
15
are formed on the common and scanning electrodes
13
and
14
to reduce line resistance. A dielectric layer
16
is formed on the bottom surface of the front substrate
11
such that the common and scanning electrodes
13
and
14
are embedded in the dielectric layer
16
. A protective layer
17
, for example, a MgO layer, is formed on the dielectric layer
16
.
Meanwhile, address electrodes
18
are formed on the rear substrate
12
to be opposed to the front substrate
11
in a strip pattern crossing the common and scanning electrodes
13
and
14
. The address electrodes
18
are embedded in a dielectric layer
19
. Partition walls
100
for defining discharge spaces are formed on the dielectric layer
19
. Each cell defined by the partition walls
100
is coated with a phosphor material layer
110
of red, green and blue (RGB).
In the operation of the conventional PDP having the above structure, once a voltage is applied between the scanning electrodes
14
and the address electrodes
18
, pre-discharge occurs and wall charges are produced in the discharge space. In the discharge spacing having the wall charges, main discharge occurs between the common electrodes
13
and the scanning electrodes
14
, thereby forming plasma. Ultraviolet rays are emitted from the plasma and excite the phosphor material layers
110
, thereby realizing an image.
To fill the inside of the PDP with a discharge gas, a panel comprised of the front and rear substrates
11
and
12
are sealed using frit glass to hold the airtightness of the space between the front substrate
11
and the rear substrate
12
, and the space is vacuum evacuated and filled with a gas. For this purpose, as shown in
FIG. 2
, an evacuation hole
21
is formed on the rear substrate
12
, and an evacuation pipe
22
is provided around the evacuation hole
21
. The evacuation pipe
22
is sealed to the rear substrate
12
through a sealing area
23
composed of a frit glass
23
a
. In other words, the frit glass
23
a
is melt at a predetermined temperature, thereby sealing the evacuation pipe
22
.
However, because the sealing area is exposed to the air, the surface of the sealing area tends to deform to an acicular shape due to permeation of moisture under a hot and humid environment. The surface of the sealing area is visually shiny and smooth in a normal state. In an experiment for testing an environmental reliability, moisture gradually made its way under the surface of the frit glass
23
a
in a test environment of 50° C. and 98% humidity and finally the surface of the sealing area deformed as if salt was sprayed on the surface thereof. Flat display products are sold in many regions in various climates. In this case, when products are exposed to an hot and humid environment for a long period of time, a sealing area deforms resulting in cracks on the surface of the sealing area or vacuum break of a panel.
SUMMARY OF THE INVENTION
To solve the above problem, an object of the present invention is to provide a sealing area of a flat display in which an acryl-type moisture-resistant coating layer is formed on the surface of a frit glass exposed to the air.
To achieve the above object, the present invention provides a sealing area of a flat display. The sealing area includes front and rear substrates provided to be opposed to each other, which are sealed to each other using frit glass so as to form a discharge space, an evacuation pipe sealed to the outer surface of the rear substrate using frit glass, and a moisture-resistant coating layer formed on the surface of the frit glass.
The moisture-resistant coating layer is preferably formed on the surface of the frit glass and the surface of the evacuation pipe.
The moisture-resistant coating layer is formed of an acryl-type material preferably including 28.6% of acryl resin, 9.9% of aromatic solvent, 8.3% of alcohol solvent and 8.3% of ester solvent.
The moisture-resistant coating layer is preferably 10 nm thick.
REFERENCES:
patent: 4266053 (1981-05-01), Imanake et al.
patent: 5677385 (1997-10-01), Miyaka et al.
patent: 5731050 (1998-03-01), Kotsubo et al.
patent: 5905335 (1999-05-01), Fushimi et al.
patent: 5961893 (1999-10-01), Honda et al.
patent: 58169847 (1983-10-01), None
patent: 60175341 (1985-09-01), None
patent: 63259943 (1988-10-01), None
patent: 02223130 (1990-09-01), None
patent: 10074583 (1998-03-01), None
Cho Hae-woon
Jin Jae-sang
Song In-sik
Lowe Hauptman & Gilman & Berner LLP
Patel Vip
Quarterman Kevin
Samsung SDI & Co., Ltd.
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