Plasma display device

Details Plasma display device Plasma display device

1999-03-30

2001-05-08

Patel, Ashok (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Three or more electrode discharge device

C313S583000, C313S584000, C313S585000, C313S587000

Reexamination Certificate

active

06229261

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a plasma display device, and more particularly, to a plasma display device having an improved address electrode structure.
2. Description of the Related Art
In a plasma display device, a glow discharge occurs by applying a predetermined voltage between two electrodes and a fluorescent layer is excited by ultraviolet light generated by the glow discharge, thereby forming a picture image.
Plasma display devices are divided into direct current (DC) plasma display devices and alternating current (AC) plasma display devices according to their operating principles. Also, depending on the electrode structure, the plasma display device has two or three electrodes for discharge. In the DC plasma display device, an auxiliary anode is additively installed for inducing an auxiliary discharge. In the AC plasma display device, an address electrode is introduced for separately providing a selective discharge and a sustaining discharge to enhance addressing speed.
Also, the electrode structure of the AC plasma display device can be classified into an opposing electrode structure and a surface-discharge type electrode structure, according to the arrangement of discharge-inducing electrodes. In the former case, two discharge-inducing sustaining electrodes are disposed on a front substrate and a rear substrate, respectively, so that a discharge takes place in a direction perpendicular to the panel. In the latter case, two sustaining electrodes are disposed on a substrate so that a discharge takes place along the substrate.
FIG. 1
shows an example of a surface-discharge plasma display device. Referring to
FIG. 1
, a dielectric layer
13
having an address electrode
12
embedded therein is formed on the upper surface of a lower substrate
11
, and a partition
14
having a predetermined pattern for defining a discharge space is formed on the upper surface of the dielectric layer
13
. An upper substrate
15
is located above the partition
14
and a common electrode
16
and a scanning electrode
17
, each having a predetermined pattern, are formed on the lower surface of the upper substrate
15
perpendicular to the address electrode
12
. A bus electrode (not shown) for reducing electrode resistance may be formed in the common electrode
16
and the scanning electrode
17
.
A dielectric layer
18
having the common electrode
16
and the scanning electrode
17
embedded therein is formed on the lower surface of the upper substrate
15
, and a protective layer
19
made of MgO coats on the lower surface of the dielectric layer
18
.
Also, a fluorescent layer
10
is formed on the upper surface of the dielectric layer
13
between neighboring partitions
14
. A discharge gas fills the discharge space.
In operation the conventional plasma display device having the above structure, when a voltage is applied to the address electrode
12
and the common electrode
16
, wall charges are accumulated by a trigger discharge. In such a state, a glow discharge occurs between the common electrode
16
and the scanning electrode
17
, thereby producing light. Then, the fluorescent layer
10
is excited by ultraviolet light, thereby forming a picture image.
In the above-described plasma display device, since the address electrode
12
is formed in strips perpendicular to the scanning electrodes
17
, the time necessary for addressing the address electrode
12
depends on the number of the scanning electrodes
17
. Thus, the fewer the scanning electrodes there are, the longer the sustaining time is necessary.
An example of an address electrode which can reduce the sustaining time considering the above problem is shown in FIG.
2
.
As shown in
FIG. 2
, an address electrode
12
′ disposed between neighboring partitions
14
′ and covered by a dielectric layer
13
′ is divided into two parts at the center of an effective screen of a plasma display device. However, even in the case of the address electrode being thus constructed, if there are many scanning electrodes, sufficient brightness cannot be attained.
SUMMARY OF THE INVENTION
To solve the above problems, it is an objective of the present invention to provide a plasma display device which can improve the brightness of a picture image by dividing address electrodes into a plurality of parts.
Accordingly, to achieve the above objective, there is provided a plasma display device including a substrate, partitions formed on the upper surface of the substrate, and an address electrode formed to be parallel to the partitions on the substrate between the partitions to induce an initial discharge and divided into at least three sections lengthwise.
According to another aspect of the present invention, there is provided a plasma display device including a substrate, a dielectric layer formed on the upper surface of the substrate, partitions formed on the dielectric layer, and an address electrode having a plurality of split electrodes spaced apart from one another to be parallel to the partitions in the dielectric layer between the partitions and conductive lead portions connected to the split electrodes.
Here, the conductive lead portions are formed between the partitions and the substrate.


REFERENCES:
patent: 5742122 (1998-04-01), Amemiya et al.
patent: 6097149 (2000-08-01), Mijaji et al.

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