Electric lamp and discharge devices – With gas or vapor – Three or more electrode discharge device
Reexamination Certificate
1998-08-27
2001-05-15
Patel, Vip (Department: 2879)
Electric lamp and discharge devices
With gas or vapor
Three or more electrode discharge device
C313S584000, C313S586000
Reexamination Certificate
active
06232716
ABSTRACT:
BACKGROUND
The present invention relates to a technique of plasma display panel(PDP) and in particular to a PDP having an electrode and a barrier rib, both formed by the photolithography and also having increased excitation area of a fluorescent material, and a method thereof.
In general, PDP is display device using gas discharge, and the PDP is thinner and lighter than the cathode ray tube using electron gun. Also, the PDP can be manufactured in enormous scale and has been highlighted as a future display device.
FIG. 1
illustrates a cross sectional view of an AC-type PDP. The PDP has a plurality of discharging cells, each of them can discharge independently. Each discharging cell
10
comprises a back substrate
1
, an address electrode
2
formed on the back substrate
1
, a discharge maintenance electrode
6
formed on the front substrate
5
in a stripe form and a protective layer
8
formed on the entire surface of the front substrate with the discharge maintenance electrode
6
. The barrier rib
3
for preventing the crosstalk between pixels, defines a unit discharge cell together with the address electrode
2
and the discharge maintenance electrode
6
located on the back substrate
1
and the front substrate
5
respectively. On the back substrate
1
having the address electrode
2
in the discharging cell is coated a fluorescent material
4
. Between the fluorescent material
4
and the protective layer
8
is provide a discharging space
9
. The discharging space
9
is filled with a discharging gas such as Ne, Ar or Xe.
If a given voltage is applied to the discharge maintenance electrode of the PDP, ultraviolet rays are generated from the discharging gas of the discharging space
9
and the fluorescent material is excited owing to the ultraviolet rays. Here, a visible light of red, blue or green is radiated according to an optical feature of the fluorescent material, thereby displaying a signal.
However, the barrier rib
3
is formed by a multiple printing method, so it is difficult to obtain the barrier rib having a uniform height and width. And luminance and resolution of the PDP are degraded. In addition, the PDP is produced by using a pair of transparent substrates in which the address electrode and the discharge maintenance electrode are formed on the respective substrates by independent processes and then two substrates are attached to each other. In case where the misalign occurs during the attaching process, an arrangement relation between the address electrode and the discharge maintenance electrode is shifted compared with the normal case, thereby reducing the luminance efficient of the discharging cell.
SUMMARY
Accordingly, an aim of a present invention is to provide a PDP having a uniform height and width and a method for manufacturing the same.
Another aim of the present invention is to prevent a misalign generated during production of the PDP by establishing a discharging cell using only one transparent substrate.
Further aim of the present invention is to enhance brightness and luminance efficient of the PDP device by increasing a discharging area of the cell and an excitation area of a fluorescent material.
In order to accomplish the aims of the present invention, one substrate is patterned to three parts. The fluorescent material is coated on a middle part thereof which is provided with at least one prominence and depression, thereby increasing the excitation area of the fluorescent material. The address electrode and the discharge maintenance electrode are formed on the same one substrate, so that the misalign generated when using two substrates is fundamentally removed. Further, the discharge maintenance electrode has a prominence which is connected to a part of the substrate on which the address electrode covered with a dielectric layer is not formed. The prominence of the discharge maintenance electrode serves as the barrier rib of a conventional PDP and is formed by using photolithography. Thus, the barrier rib of the present invention has a uniform height and width. In detail, a PDP comprises single transparent substrate. The substrate has a first part, a second part and a third part. The PDP has a first electrode, i.e. address electrode formed on the first part and a first dielectric layer formed on the entire transparent substrate with the first electrode. The second part is located between the first and the third parts, and comprises at least one prominence and depression, and height of the prominence and depression is lower than those of the first part and the third part. A fluorescent material is coated on the first dielectric layer located on the second part. A second electrode having prominences is positioned on the first dielectric layer portion of the third part, and is connecting the prominences each other, and is extended to be orthogonal to the first electrode. A second dielectric layer is formed on a bottom of the second electrode. A third electrode is formed on the second electrode positioned on the first electrode. A third dielectric layer is formed on the second electrode including the third electrode. An ultraviolet shielding layer is disposed between the prominence of the second electrode and adjacent another prominence thereof in an extension direction of the first electrode. Herein, the ultraviolet shielding layer is a metal layer, an insulating layer, an organic resin or an inorganic resin. So as to manufacture such a PDP, first, a transparent substrate is prepared. A first electrode is formed on a predetermined part of the substrate. The transparent substrate is defined by using a photoresist mask pattern into a first part having a prominence, a third part being separated from the first part and a second part between the first and third parts, and the second part with a prominence and a depression has a height lower than those of the first and third parts. Herein, said first electrode is formed on the first part. A first dielectric layer is formed on the entire transparent substrate including the first electrode. A fluorescent material is coated on the second part. A sacrificial layer having an even surface is formed on the resultant. A contact hole exposing the first dielectric layer positioned over the third part is formed in the sacrificial layer. A second dielectric layer is formed on both inner sides and a bottom of the contact hole and on the sacrificial layer. A second electrode is formed on the second dielectric layer with completely filling the contact hole and being extended orthogonal to the first electrode. A third electrode is formed on the second electrode positioned on the first electrode. A third dielectric layer is formed on the second electrode including the third electrode. A part of the second dielectric layer, the third dielectric layer and the sacrificial layer are removed so as to define a discharging space. The sacrificial layer is made of polyimide. A seed layer for an electrode is formed on the second dielectric layer. A photoresist pattern is formed on said seed layer. An exposed part of the seed layer part is electroplated by the photoresist pattern, thereby forming an electroplating layer. Herein, an ultraviolet shielding layer is further formed in a space between the prominence of the second electrode and adjacent another prominence thereof in an extension direction of the first electrode. The ultraviolet shielding layer is a metal layer, an insulating layer, an organic resin or an inorganic resin.
REFERENCES:
patent: 3942061 (1976-03-01), Van Esdonk et al.
patent: 5209688 (1993-05-01), Nishigaki et al.
patent: 5260624 (1993-11-01), Kim et al.
patent: 5557168 (1996-09-01), Nakajima et al.
patent: 5757131 (1998-05-01), Tsuchiya
patent: 5939828 (1999-08-01), Matsuzaki et al.
patent: 6005345 (1999-12-01), Choi et al.
Ok Do Young
Pyun Deuk Soo
Hyundai Electronics Industries Co,. Ltd.
Patel Vip
Selitto & Associates, P.C.
Williams Joseph
LandOfFree
AC-type plasma display panel using single substrate and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with AC-type plasma display panel using single substrate and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and AC-type plasma display panel using single substrate and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2476983