Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
2000-11-29
2002-07-16
Philogene, Haissa (Department: 2821)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C313S486000, C345S060000
Reexamination Certificate
active
06420835
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention provides a color plasma display panel, and more particularly, to a color plasma display panel that can adjust the covering area of fluorescence layer to increase the color temperature.
2. Description of the Prior Art
Color plasma display panels (PDP) is teamed up with several hundred thousand display units in permutations and combinations which is several hundred micrometers in size, the light source comes from applying a voltage on a discharging gas in order to produce ultraviolet rays. When the ultraviolet rays incident on different fluorescent layer, the fluorescent layers will emit three colors: red, green and blue. Generally speaking, the material of the fluorescent layer determines the color emitted from the fluorescent layer. When the fluorescent material contains (Y,Gd)BO
3
and Eu, a red fluorescent ray will be produced; when the fluorescent material contains ZnSO
4
and Mn, a green fluorescent ray will be produced; when the fluorescent material contains BaMgAl
14
O
23
and Eu, a blue fluorescent ray will be produced.
However, the fluorescent material becomes degraded because of heat, therefore, the quality of the blue fluorescent ray is poor. The present technique for improving the luminescent quality of color plasma display panel is to enlarge the discharge space of blue fluorescent ray in order to increase the covering area of the fluorescent material. In the meanwhile, the ratio of red fluorescent ray, blue fluorescent ray, and blue fluorescent ray is adjusted in order to increase the color temperature of PDP from 7000° K. to 11000° K.
Referring to
FIG. 1
,
FIG. 1
is a schematic diagram of color plasma display panel
10
in according to the prior art. The prior art color display panel
10
comprises a first substrate
12
, a second substrate
14
parallel to the first substrate
12
, a discharge gas (not shown) that fills the space between the first substrate
12
and the second substrate
14
, a plurality of first electrodes
18
, a plurality of second electrodes
20
, and a plurality of addressing electrodes
22
. Each of the first electrodes
18
and each of the second electrodes
20
is positioned on the first substrate
12
in parallel. Each of the address electrodes
22
are positioned on the second substrate
14
and are orthogonal to the first electrodes
18
and the second electrodes
20
.
Each of the first electrodes
18
and the second electrodes
20
respectively comprises a sustaining electrode
181
,
201
,and an auxiliary electrode
182
,
202
. The sustaining electrode
181
,
201
is usually made of indium tin oxide (ITO), and the auxiliary electrode
182
,
202
is usually made of a Chrome/Copper/Chrome (Cr/Cu/Cr) metal alloy. The sustaining electrode
181
,
201
has high resistance, but is transparent to visible light. The auxiliary electrode
182
,
202
has a good conductivity and is used to increase the conductivity of the first electrode
18
and second electrode
20
.
The plasma display panel
10
further includes a dielectric layer
24
that covers the surfaces of the first substrate
12
. A protective layer
26
then 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 addressing electrode
22
is positioned between two adjacent barrier ribs. A fluorescent layer
32
coats on the bottom of each discharge spaces
30
and the side wall of the barrier rib
28
within each discharge space
30
in order to produce the red, green or blue rays. Each of the discharge space
30
comprises a plurality of display unit
34
, and all of the display units
34
are arranged between the first substrate
12
and the second substrate
14
.
In addition, all of the stripy shaped discharge space
30
consists of a plurality of discharge space set, each discharge space set includes a red discharge space
30
R coated with red fluorescent layer
32
R, a green discharge space
30
G coated with green fluorescent layer
32
G, and a blue discharge space
30
B coated with blue fluorescent layer
32
B. Therefore, a plurality of red display units
34
R are formed within the red discharge space
30
R, a plurality of green display units
34
G are formed within the green discharge space
30
G, a plurality of blue display units
34
B are formed within the blue discharge space
30
B. A red display unit
34
R, a green display unit
34
G, and a blue display unit
34
B is defined as a pixel.
As mentioned above, in order to improve the quality of the blue fluorescent light, the width of the blue discharge space
30
B will be enlarged. The width of the red discharge space
30
R is designed as the narrowest one, the width of the green discharge space
30
G is designed as the medium one, and the width of the blue discharge space
30
B is designed as the largest one. The width of the green discharge space is about 1.2 times of the width of the red discharge space
30
R, and the width of the blue discharge space
30
B is about 1.6 times of the width of the red discharge space
30
R in according to the prior art. Therefore, the space of the red display unit
34
R is the smallest one, the space of the blue display unit
34
B is the largest one in order to adjust the ratio of red, green, and blue fluorescent light from plasma display panel
10
. Therefore, the surface area of the blue fluorescent layer
32
B coated in blue display unit
34
B will be the largest, the surface area of the red fluorescent layer
32
R coated in red display unit
34
R will be the smallest. Therefore, when the discharge gases are discharged to produce visible lights, the amount of blue light will be larger. Therefore, the red, green, and blue lights are mixed subtly to reach the white balance state, and the color temperature of color plasma display panel
10
is. increased to around 11000° K.
However, the resolution of the plasma display panel is continuous increased and the widths of all discharge spaces begin to shrink. Since the ratio of the widths of the discharge spaces
30
is designed as a fixed proportion, the width of the red discharge space
30
R is then very small. Hence, it becomes difficult to manufacture the barrier rib
28
and the red fluorescent layer
32
R. The alignment of the first substrate
12
and the second substrate
14
becomes difficult, too. In addition, the width of the red discharge space
30
R is too narrow so the cross-talk problem of the discharge gas is increased to cause interferences, and further influence the electrical performance of the color plasma display panel
10
.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a color plasma display panel having a higher color temperature and a higher covering area of the fluorescent layer.
In accordance with the preferred embodiment of the present invention, the plasma display panel comprises a rear plate having a rear plate surface thereon, a front plate parallel to and spaced apart from the rear plate forms a space between the front plate and the rear plate. A first, a second, and a third barrier ribs are positioned on the rear plate, these ribs are formed in parallel and spaced apart from each other by a predetermined distance. The space between the first barrier rib and the second barrier ribs is defined as a first discharge space, and the space between the second and the third barrier ribs is defined as a second discharge space. The plasma display panel further comprises a first bottom rib positioned on a first region of the rear plate surface in the first discharge space, and a second bottom rib positioned on a second region of the rear plate surface in the second discharge space. The first bottom rib has a first thickness and the second bottom rib has a second thickness. A first fluorescent layer is coated on the surface of the first bottom rib and the sidewall surface of the barrier rib surrounding the first discharge space. A second fluorescent layer is coated on the surface of
Chen Po-Cheng
Li Chien-Hsing
Wu Jiun-Han
Alemu Ephrem
AU Optronics
Hsu Winston
Philogene Haissa
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