Electric lamp and discharge devices – With gas or vapor – Three or more electrode discharge device
Reexamination Certificate
2002-03-12
2003-12-09
Wong, Don (Department: 2821)
Electric lamp and discharge devices
With gas or vapor
Three or more electrode discharge device
C445S024000
Reexamination Certificate
active
06661169
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates in general to a plasma display panel (PDP). In particular, the present invention relates to a rear plate of a PDP and the method for forming ribs thereon.
2. Description of the Related Art
Recently, a variety of flat panel displays, such as a liquid crystal display (LCD) and a plasma display panel (PDP) have been intensively developed to replace cathode ray tube (CRT) displays. In PDP technololgy, an ultraviolet light is emitted to excite the RBG phosphors to produce visible lights. The advantages of the PDP include a large display area, wide viewing angle, and intense brightness.
The PDP has a front plate and a rear plate spaced apart to each other with the peripheries thereof sealed. In general, the PDP includes barrier ribs for partitioning the discharge spaces. The barrier ribs prevent discharge coupling and color cross-talk between adjacent cells. The traditional method for forming the ribs is described hereafter with
FIGS. 1A and 1B
.
As shown in
FIG. 1A
, the address electrodes
12
are formed on the glass substrate
10
. The dielectric layer
14
is formed to protect the address electrodes
12
after sintering. The rib material layer
16
is formed on the dielectric layer
14
. The dry film is laminated on the rib material layer
16
. After exposing and developing, the dry film
18
is patterned as shown in FIG.
1
A.
Referring to
1
B, the rib material layer
16
is patterned by sandblasting to form the ribs
16
a.
In the above-mentioned traditional processes, the dielectric layer
14
under the ribs
16
a
is used to protect the address electrodes
12
from damage in the sandblasting step. A sintering step is needed after forming the dielectric layer
14
, the manufacturing time is longer and the manufacturing cost is increased. Moreover, the height of the ribs
16
a
is about 100~200 &mgr;m, therefore the sandblasting time is too long to keep the uniformity of the bottom width and the profiles of the ribs
16
a
. If the lateral action between the sands and the rib material is strong in the sandblasting step, the bottom area of the ribs
16
a
will be small. The size of the ribs
16
a
affects the size of the discharging cell and the strength of the ribs
16
a
. If the width of the ribs
16
a
is narrowed, the space of the discharging cell is increased so that the coating yield of the phosphors is enhanced. Therefore, the brightness is enhanced and the consumption of power is reduced. When the width the ribs
16
a
is too smaller, the strength of the ribs
16
a
is also reduced. The height of the ribs
16
a
is very high now, if the width of the ribs
16
a
is further reduced or the height is further increased, the stability of the ribs
16
a
is damaged and these ribs
16
a
may collapse.
SUMMARY OF THE INVENTION
The present invention provides a method for fabricating ribs of a PDP. In this method, one sintering step can be eliminated, the width of the rib and the profile of the ribs can all be effectively controlled, and the space of the discharging cell can be increased without damaging the stability of the rib.
The present invention provides a method for forming PDP ribs. First, a plurality of address electrodes and base plates are formed on the glass substrate. The address electrodes and the base plates alternate with each other, and a predetermined distance is formed between each address electrode and each base plate. A rib material layer is formed above the address electrodes, the base plates and the glass substrate. A patterned mask layer is formed on the rib material layer. The rib material layer is sandblasted to form a plurality of ribs accord to the pattern of the base plates. The shape of the base plates can be changed on demand so the structure of the ribs can be changed. Alternatively, a passivative film can be formed on the address electrodes to prevent from damage in the sandblasting step.
The present invention also provides a rear plate of the plasma display panel (PDP). The rear plate includes a glass substrate, a plurality of address electrodes, a plurality of base plates, and a plurality of ribs. The address electrodes and the base plates alternate with each other and are parallel to each other. There is a predetermined distance between each address electrode and each base plate. The ribs are disposed on the base plates, and the bottom width of each rib is the same as that of each base plate.
REFERENCES:
patent: 5541479 (1996-07-01), Nagakubo
patent: 5860843 (1999-01-01), Kasahara
patent: 6428945 (2002-08-01), Lin et al.
patent: 6508685 (2003-01-01), Lee et al.
patent: 404259733 (1992-09-01), None
AU Optronics Corp.
Ladas & Parry
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