Electric lamp and discharge devices – With gas or vapor – Three or more electrode discharge device
Reexamination Certificate
2001-08-30
2003-02-04
Patel, Vip (Department: 2879)
Electric lamp and discharge devices
With gas or vapor
Three or more electrode discharge device
C313S493000
Reexamination Certificate
active
06515420
ABSTRACT:
BACKGROUND OF INVENTION
1. Field of the Invention
The present invention relates to a full-color plasma display panel, and more particularly, to a plasma display panel using different discharge gases to emit variant colors of light.
2. Description of the Prior Art
A full-color plasma display panel (PDP) is a common type of flat display that uses discharge gases to emit multi-color lights. The luminescent performance of the PDP is made by the millions of tiny discharge cells for emitting fluorescent lights of various colors. The prior PDP includes phosphor materials coated in these tiny discharge cells. The dimensions of these cells can be in the order of a few hundred microns. Each of the cells is filled with a discharge gas of a mixture of neon (Ne) and xenon (Xe), or a mixture of helium (He) and xenon (Xe). When the plasma is excited, the discharge gas emits ultraviolet light and the ultraviolet light in turn irradiates the phosphor materials to result in the emission of red, green or blue light.
Please refer to FIG.
1
.
FIG. 1
is a perspective view of a full-color PDP
10
according to the prior art. The prior PDP
10
includes a first substrate
12
, a second substrate
14
parallel to the first substrate
12
, and a discharge gas (not shown) that fills the space between the first substrate
12
and the second substrate
14
. The prior PDP
10
further includes a plurality of first electrodes
18
, a plurality of second electrodes
20
, and a plurality of third electrodes
22
. The first electrodes
18
and the second electrodes
20
are positioned in parallel and spaced apart to each other by a fixed distance on the first substrate
12
. Each of the third electrodes
22
is positioned on the second substrate
14
, and is perpendicular to both the first electrodes
18
and the second electrodes
20
. Each of the first electrodes
18
and the second electrodes
20
includes a maintaining electrode
181
,
201
, and an auxiliary electrode
182
,
202
, respectively. The maintaining electrodes
181
,
201
are made of ITO materials, and the auxiliary electrodes
182
,
202
are made of a Cr/Cu/Cr metal alloy. The maintaining electrodes
181
,
201
have high resistance and poor conductivity, but are transparent to visible light. The auxiliary electrodes
182
,
202
have low resistance to increase the conductivity of its respective electrode
18
,
20
.
The PDP
10
further includes a dielectric layer
24
covering the surfaces of the first substrate
12
, the first electrodes
18
, and the second electrodes
20
. A protective layer
26
covers the dielectric layer
24
. A plurality of barrier ribs
28
are positioned in parallel on the second substrate
14
to define a plurality of discharge spaces
30
of strip shape. Each third electrode
22
is positioned between two adjacent barrier ribs
28
. A phosphor layer
32
covers the third electrode
22
and the barrier rib
28
within each discharge space
30
in order to produce red, green, or blue light.
Each of the discharge spaces
30
has a plurality of display units
34
. Each display unit is defined by one first electrodes
18
, one second electrodes
20
, and one third electrodes
22
. When an initiating voltage is applied on the first electrode
18
and the third electrode
22
, the discharge gas between the first electrode
18
and the third electrode
22
is ionized to form charges on the walls. Both the first electrode
18
and the second electrode
20
are used to drive the plasma formed in these display units
34
for causing a continuous emission of ultraviolet light. Under the ultraviolet light, the phosphor layer
32
emits lights which are transmitted through the transparent first substrate
12
and seen by the user.
The color of lights emitted from the phosphor layer
32
have different colors according to the phosphor materials. Usually, red light is emitted by the phosphor layer
32
when the material of the phosphor layer
32
has ((Y,Gd)BO
3
), and Eu is added as an activating agent. The green light is emitted when the material of the phosphor layer
32
has Zn
2
SO
4
, and Mn is added as an activating agent. Finally, the blue light is emitted when the material of the phosphor layer
32
has BaMgAl
14
O
23
, and Eu is added as an activating agent.
However, the manufacturing method of the phosphor materials is complicated, and the costs of these materials are not cheap. The purity of the red light emitted from the phosphor layer
32
is poor, some remaining images will be produced by the green light, and the blue light will be degraded easily. Further, the phosphor layer
32
coated within the discharge space
30
is easily damaged by plasma bombardment, which shortens the life of the PDP
10
.
SUMMARY OF INVENTION
It is therefore a primary objective of the present invention to provide a full-color PDP that uses different discharge gases to emit variant colors of light. At the same time, a reflecting layer is used to reflect the light emitted by each discharge gas to prevent the light emitting through the rear plate so as to increase the luminescent efficiency of the PDP and avoid the problems associated with the phosphor materials.
In a preferred embodiment, the plasma display panel(PDP) disclosed in the present invention includes a rear plate, a front plate spaced apart and positioned in parallel with the rear plate, and a plurality of barrier ribs positioned in the space between the rear plate and the front plate to define a plurality of discharge space groups. Each discharge space group includes a first discharge space, a second discharge space, and a third discharge space. Each discharge space is filled with the different discharge gases including a first, a second, and a third discharge gas for respectively emitting of one of three primary colors. The rear plate of the PDP has a reflecting layer to reflect the light and prevent the light from penetrating through the rear plate so as to increase the luminescent efficiency of the PDP.
It is an advantage of the present invention that it provides a plasma display panel(PDP) with greater luminescent efficiency. As well, the problems associated with phosphor materials are prevented occurring in the PDP of the present invention. As a result, the life time of the PDP is extended.
Chen Po-Cheng
Li Chien-Hsing
Wu Jiun-Han
AU Optronics Corp.
Hsu Winston
Patel Vip
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