Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
2000-06-14
2001-07-10
Philogene, Haissa (Department: 2821)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C315S169100, C313S582000, C313S586000, C313S587000, C345S072000, C345S077000, C345S068000
Reexamination Certificate
active
06259212
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a plasma display panel in which the structure of a partition wall formed on a rear substrate is improved.
2. Description of the Related Art
A plasma display panel (PDP) usually produces a discharge in a gas that is hermetically sealed between two substrates having electrodes, which generates ultraviolet rays. The ultraviolet rays excite phosphors, thereby displaying a desired image.
FIG. 1
shows a conventional PDP. Referring to
FIG. 1
, a front substrate
11
and a rear substrate
12
are located opposite to each other. Common electrodes
13
and scanning electrodes
14
alternate on the bottom surface of the front substrate
11
in a striped pattern. Bus electrodes
15
may be formed on the common and scanning electrodes
13
and
14
to reduce line resistance. A dielectric layer
16
on the bottom surface of the front substrate
11
embeds the common and scanning electrodes
13
and
14
. A protective layer
17
, for example, a MgO layer, may be formed on the dielectric layer
16
.
Address electrodes
18
are formed on the rear substrate
12
crossing the common and scanning electrodes
13
and
14
. The address electrodes
18
are embedded in a dielectric layer
19
with which the rear substrate
12
is coated. Partition walls
100
on the dielectric layer
19
are parallel to the address electrodes
18
in a striped pattern. Portions between the partition walls
100
are coated with phosphor layers
110
producing red, green and blue light.
The partition walls
100
may have various shapes. Each partition wall
100
is composed of a transparent white partition wall
100
a
having a predetermined height from the top of the dielectric layer
19
and a black partition wall
100
b
on the white partition wall
100
a
. The white partition wall
100
a
is provided to act as a reflector so as to improve the luminance efficiency of the phosphor layer
110
during discharge. The black partition wall
100
b
has a predetermined thickness so as to function as a black matrix.
In 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 this state, when a voltage is applied between the common electrodes
13
and the scanning electrodes
14
, a glow discharge occurs, thereby changing the gas into a plasma. Ultraviolet rays are emitted from the plasma and excite the phosphor layers
110
, thereby displaying an image.
The phosphor layers
110
producing red, green and blue light are on the dielectric layer
19
and between the partition walls
100
. In the conventional PDP
10
, the light produced by the blue phosphor layers is relatively lower in luminance than the light produced by the red and green phosphor layers. To compensate for the low luminance from the blue phosphor layer, various methods have been developed. One method is to provide a blue phosphor layer that is wider than a red phosphor layer and a blue phosphor layer. Another method is to increase the luminance of a blue phosphor layer using an additional blue filter.
However, when enlarging the area of a blue phosphor layer to be wider than the area of a red phosphor layer and the area of a green phosphor layer, the size of a discharge cell defined by a pair of common and scanning electrodes
13
and
14
, in which a sustain discharge occurs, is not uniform. Moreover, when an additional blue filter is used for improving the luminance of a blue phosphor layer, the structure of the PDP
10
becomes complicated.
SUMMARY OF THE INVENTION
To solve the above problem, an object of the present invention is to provide a plasma display panel (PDP) in which the structure of a partition wall is improved to increase the luminance of a blue phosphor layer.
To achieve the above object, the present invention provides a plasma display panel including front and rear substrates provided to face each other; common and scanning electrodes formed on the bottom surface of the front substrate to be spaced apart from and parallel to each other; a first dielectric layer formed on the bottom surface of the front substrate such that the common and scanning electrodes are embedded in the first dielectric layer; address electrodes formed on the rear substrate to be orthogonal to the common and scanning electrodes; a second dielectric layer formed on the top surface of the rear substrate such that the address electrodes are embedded in the second dielectric layer; partition walls for defining discharge spaces, each partition wall comprising a white partition wall formed on the top surface of the second dielectric layer and an auxiliary partition wall formed on the top surface of the white partition wall, the auxiliary partition wall selectively reflecting only light of a wavelength of 420-550 nanometers among visible rays; and red, green and blue phosphor layers formed on the second dielectric layer and between the partition walls.
The auxiliary partition wall is blue and mainly formed of a glass material having a low melting point and containing cobalt aluminum oxide (CoAl
2
O
4
).
REFERENCES:
patent: 5541479 (1996-07-01), Nagakubo
patent: 6008582 (1999-12-01), Asano et al.
patent: 6034474 (2000-03-01), Ueoka et al.
patent: 6137226 (2000-10-01), Nagano
patent: 6184848 (2001-02-01), Weber
patent: 6184849 (2001-02-01), Stoller
patent: 0 712 148 (1996-05-01), None
patent: 10-188820 (1998-07-01), None
patent: 10-208645 (1998-08-01), None
Leydig , Voit & Mayer, Ltd.
Philogene Haissa
Samsung SDI & Co., Ltd.
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