Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
2001-05-09
2003-07-22
Wong, Don (Department: 2821)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C313S509000
Reexamination Certificate
active
06597124
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a flat panel display device, and more particularly, to a plasma display panel.
2. Discussion of the Related Art
Generally, a plasma display panel and a liquid crystal display (LCD) have lately attracted considerable attention as the most practical next generation display of flat panel displays. In particular, the plasma display panel has higher luminance and a wider viewing angle than the LCD. For this reason, the plasma display panel is widely used as a thin type large-sized display such as an outdoor advertising tower, a wall TV and a theater display.
A related art plasma display panel of three-electrode area discharge type will be described with reference to the accompanying drawings.
As shown in
FIG. 1
a
, the related art plasma display panel of three-electrode area discharge type includes an upper substrate
10
and a lower substrate
20
which face each other. In
FIG. 1
b
, the lower substrate
20
is rotated by 90°.
The upper substrate
10
includes scan electrodes
16
and
16
′, sustain electrodes
17
and
17
′, a dielectric layer
11
, and a passivation layer
12
. The scan electrodes
16
and
16
′ are formed in parallel to the sustain electrodes
17
and
17
′. The dielectric layer
11
is deposited on the scan electrodes
16
and
16
′ and the sustain electrodes
17
and
17
′.
The lower substrate
20
includes address electrodes
22
, a dielectric layer
21
formed on an entire surface of the substrate including the address electrodes
22
, barriers
23
formed on the dielectric layer
21
between the respective address electrodes
22
to divide respective discharge cell regions, and a phosphor
24
formed on surfaces of the barriers
23
in each discharge cell and of the dielectric layer
21
.
Inert gases such as He and Xe are mixed in a space between the upper substrate
10
and the lower substrate
20
at a pressure of 300 to 700 Torr. The space forms a discharge area.
The operation of the aforementioned AC type plasma display panel of three-electrode area discharge type will now be described.
If a driving voltage is applied between each address electrode and each scan electrode, opposite discharge occurs between the address electrode and the scan electrode. Some electrons emitted from the inert gas within the discharge cell come into collision with a surface of the dielectric layer due to the opposite discharge. The collision of the electrons secondarily emits electrons from the surface of the dielectric layer. The secondarily emitted electrons come into collision with a plasma gas to diffuse the discharge. If the opposite discharge between the address electrode and the scan electrode ends, wall charges having opposite polarities occur on the surface of the passivation layer on the respective address and scan electrodes.
If the discharge voltages having opposite polarities are continuously applied to the scan electrode and the sustain electrode and at the same time the driving voltage applied to the address electrode is cut off, area discharge occurs in a discharge area on the surfaces of the dielectric layer and the dielectric layer due to potential difference between the scan electrode and the sustain electrode. The electrons in the discharge cell come into collision with the inert gas in the discharge cell due to the opposite discharge and the area discharge. As a result, the inert gas in the discharge cell is excited and ultraviolet rays having a wavelength of 147 nm occur in the discharge cell. The ultraviolet rays come into collision with the phosphors surrounding the address electrode and the barriers, so that the ultraviolet rays are emitted. Thus, the plasma display panel is operated.
The plasma display panel has several problems.
Electrostatic force occurs between the upper and lower substrates as the power source is applied to the plasma display panel to operate the plasma display panel. At this time, since the scan electrode and the sustain electrode are alternately formed inside the panel, the electrostatic force may be removed. However, since either the scan electrode or the sustain electrode exists outside the panel, charges are accumulated. If the accumulated charges become great, the upper and lower substrates vibrate when the plasma display panel is operated by the electrostatic force. For example, Just like a Speaker vibration. For this reason, noise occurs. The noise mainly occurs outside the panel, but the noise may occur inside the panel due to the electrostatic force that partially remains without being removed.
When an adhesive material is deposited on the upper and lower substrates to attach them to each other, the adhesive material is not uniformly deposited on the upper and lower substrates. Also, pressures between respective directions of a holder that fixes the upper and lower substrates to each other are not uniform. As a result, noise may occur or error discharge may be caused.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a plasma display panel that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide a plasma display panel that prevents electrostatic force of upper and lower substrates and noise and error discharge due to non-uniformity.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the scheme particularly pointed out in the written description and claims hereof as well as the appended drawings.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, a plasma display panel according to the present invention includes a lower substrate, a plurality of barriers formed on the lower substrate, an upper substrate, a dielectric layer formed on the upper substrate to have grooves of a predetermined depth along regions adjoining the barriers, and a plurality of ground electrodes formed between the barriers and the grooves of the dielectric layer, having both ends commonly connected to one another.
In another aspect, a plasma display panel according to the present invention includes an upper substrate, a lower substrate, a plurality of barriers formed between the upper substrate and the lower substrate to divide respective discharge cells, an adhesive material deposited on a predetermined region of the upper substrate or the lower substrate to attach the upper substrate to the lower substrate, and a plurality of support members having a predetermined length and a width, formed at constant intervals along a region where the adhesive material is deposited, so that the support members in pairs oppose each other based on the region deposited with the adhesive material.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
REFERENCES:
patent: 4996460 (1991-02-01), Kim et al.
patent: 5541479 (1996-07-01), Nagakubo
patent: 5627347 (1997-05-01), Kwon
patent: 5793158 (1998-08-01), Wedding, Sr.
patent: 2002/0008472 (2002-01-01), Ha
patent: 04-095331 (1992-03-01), None
Kim Won Tae
Park Young Chan
Fleshner & Kim LLP
LG Electronics Inc.
Tran Thuy Vinh
Wong Don
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