Electric lamp and discharge devices – With gas or vapor – Three or more electrode discharge device
Reexamination Certificate
2003-11-03
2004-11-09
Vu, David (Department: 2821)
Electric lamp and discharge devices
With gas or vapor
Three or more electrode discharge device
C313S585000
Reexamination Certificate
active
06815890
ABSTRACT:
This application claims the benefit of Taiwan application Serial No. 091134238, filed Nov. 25, 2002.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates in general to a plasma display panel, and more particularly to a plasma display panel with common data electrodes.
2. Description of the Related Art
Plasma display panel (PDP) whose display characteristics are far better than that of cathode ray tube (CRT) due to the features of big size, wide view angle, high resolution and full-colored image display etc., has drawn considerable attention in recent years.
Refer to
FIG. 1
, which is a three-dimensional diagram of a conventional plasma display panel. The plasma display panel includes a front substrate
102
and a rear substrate
108
with a number of alternately arranged sustaining electrodes X and scanning electrodes Y being disposed on the front substrate
102
wherein a number of transparent electrodes (not shown) can be formed and defined before the formation of the above sustaining electrodes X and scanning electrodes Y. The transparent electrodes whose patterns are determined according to their designs would not be described in detail. The above sustaining electrodes X and scanning electrodes Y are covered by a dielectric layer
104
, while the dielectric layer
104
is covered by a protection layer
106
, which is composed of magnesium oxide and is used to protect sustaining electrodes X, scanning electrodes Y and the dielectric layer
104
. Moreover, a number of data electrodes A are disposed on the rear substrate
108
and are covered by a dielectric layer
116
, wherein data electrodes A are orthogonal to sustaining electrodes X and scanning electrodes Y A number of barrier ribs
112
are disposed on the rear substrate
108
along the direction of data electrodes A with a number of fluorescent layers
110
covering between every two adjacent barrier ribs
112
.
The cavity between the front substrate
102
and the rear substrate
108
is a discharge space filled with discharge gas, which is a mixture of neon and xenon. A display unit is defined by a sustaining electrode X and a scanning electrode Y, both are disposed on the front substrate
102
, together with their corresponding data electrode A, which is disposed on the rear substrate
108
. Therefore, a number of display units arranged in matrix can be defined on a plasma display panel by the sustaining electrodes X, scanning electrodes Y and data electrodes A. By exciting the gas in the discharge, the excited gas will emit ultraviolet rays. The fluorescent layer
110
will emit visible light after absorbing ultraviolet rays of specific wavelengths.
Refer to
FIG. 2
, a schematic diagram illustrating the relation between several display units of horizontal arrangement and each electrode in the plasma display panel shown in FIG.
1
. Display units of different colors can be obtained by forming fluorescent layers corresponding to different colors between adjacent barrier ribs. As shown in
FIG. 2
, data electrodes A
1
, A
2
and A
3
are used to control red display units R
1
and R
2
, green display units G
1
and G
2
, blue display units B
1
and B
2
respectively. The driving method for these display units includes the following steps. First, during an erasing period, erase displaying data for all display units. Next, during an addressing period, sequentially scan scanning electrodes Y
1
and Y
2
, and select the display units to be lighted by enabling data electrodes A
1
to A
3
. After that, during a discharge sustaining period, the selected display units will be lighted continuously by providing an alternating voltage between the sustaining electrode X
1
and scanning electrode Y
1
, and the sustaining electrode X
2
and scanning electrode Y
2
.
In addition to the display unit of horizontal arrangement as shown in
FIG. 2
, display units can also be disposed in triangle arrangement. Refer to
FIG. 3
, a schematic diagram illustrating a conventional relations between several display units of triangle arrangement and each electrode. The display units of triangle arrangement are achieved by means of honeycomb type barrier ribs
302
. Take the adjacent and alternately arranged display units green display unit G
2
and red display unit R
3
for example. Green display unit G
2
is controlled by data electrode A
2
and scanning electrode Y
1
while red display unit R
3
is controlled by data electrode A
1
and scanning electrode Y
1
. When scanning electrode Y
1
is scanned, green display unit G
2
and red display unit R
3
can be respectively selected by data electrodes A
1
and A
2
.
Conventionally, the adjacent and alternately arranged display units must be controlled by different data electrodes, so a large number of data electrodes are required in order to control display units. Since a large number of data electrodes are required, the cost of a conventional plasma display panel is increased. Besides, the manufacturing process becomes more complicated due to the narrow space between adjacent data electrodes.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide a plasma display panel, which controls two adjacent and alternately arranged display units using common data electrodes. By reducing the required number of data electrodes, the manufacturing cost can be further lowered.
It is therefore an object of the invention to provide a plasma display panel including a plurality of sustaining electrodes, scanning electrodes, data electrodes, the first display unit and the second display unit. These sustaining electrodes and scanning electrodes form at least two adjacent electrode combinations, namely the first electrode combination and the second electrode combination, wherein each electrode combination includes a sustaining electrode and a scanning electrode. Data electrodes are disposed along a direction approximately orthogonal to these sustaining electrodes and scanning electrodes. The first display unit corresponds to the first primary color and is controlled by the first data electrode and the first electrode combination while the second display unit corresponds to the second primary color and is controlled by the first data electrode and the second electrode combination, wherein the first display unit and the second display unit are adjacent and alternately arranged.
Other objects, features, and advantages of the invention will become apparent from the following detailed description of the preferred but non-limiting embodiments. The following description is made with reference to the accompanying drawings.
REFERENCES:
patent: 4518894 (1985-05-01), Andreadakis
patent: 6242860 (2001-06-01), Sasao et al.
Su Yao-Ching
Tsai Chung-Kuang
AU Optronics Corp.
Vu David
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