Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making named article
Reexamination Certificate
2000-03-01
2002-10-22
McPherson, John A. (Department: 1756)
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making named article
C430S314000, C430S319000, C445S024000
Reexamination Certificate
active
06468719
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a front substrate for AC plasma display panel, and more particularly to such a front substrate in which each X-electrode and Y-electrode have a respective discharge side facing to each other and arranged in parallel, defining therebetween a straight discharge path. The invention relates also to the fabrication of such a front substrate.
In the fabrication of a conventional AC plasma display panel
10
, as shown in
FIG. 1
, a front substrate
11
and a rear substrate
12
are arranged in parallel and encapsulated, and a gas mixture containing Ne and Xe is sealed in the discharging space between the substrates. The front substrate
11
comprises parallel transparent electrodes
111
arranged on its inner side, parallel sub electrodes
112
respectively arranged on the transparent electrodes
111
, an induction layer
113
covered over the electrodes
111
and
112
, and a protective layer
114
covered on the induction layer
113
. The rear substrate
12
comprises a plurality of data electrodes
121
arranged in parallel on its inner side, an induction layer
124
covered over the data electrodes
121
, parallel lines of partition wall
122
arranged on the induction layer
124
and extended to the protective layer
114
at the front substrate
11
, and fluorescent body
123
covered on the induction layer
124
around the lines of partition wall
122
. When electric voltage is applied to the electrodes
111
,
112
and
121
, electricity is discharged in the cells
13
between the induction layers
113
and
124
, causing the fluorescent body
123
to emit the corresponding color of light. In the fabrication of the front substrate
11
of the aforesaid AC plasma display panel
10
, a photolithography or printing technique is used to make transparent electrodes
111
on the inner side of the front substrate
11
, and steam-plating and photolithography techniques are used to form sub electrodes
112
on the transparent electrodes
111
to reduce the line impedance of the transparent electrodes
11
. In the following description, X-electrode and Y-electrode are used to represent each two adjacent transparent electrodes
111
(including the corresponding sub electrodes
112
) on the front substrate
11
. The two electrodes act with one data electrode
121
at the rear substrate
12
, enabling the induction layers
113
and
124
to discharge electricity into the corresponding cell
13
. In the aforesaid front substrate
11
, the equivalent circuits formed upon discharging of the X-electrodes and Y-electrodes are as shown in
FIG. 2
, in which Cg is gas-filled capacitor, Cd is induction layer capacity, Cs
1
and Cs
2
are stray capacity produced in the glass substrate
11
and the induction layer
113
. The equivalent circuits can be simplified into a parallel circuit formed of capacities Cg and Cd and capacities Cs
1
and Cs
2
and connected between the X-electrode and Y-electrode as shown in FIG.
3
. In the aforesaid X and Y electrodes design, the discharging sides of the electrodes are almost arranged on the same level, and the discharging paths are presented in an arch shape. This design has the following drawbacks.
1. Uneven distribution of electric field: As shown in
FIG. 4
, the intensity of the electric field becomes stronger at the center area between the X-electrode and the Y-electrode, causing a relatively better discharging effect and a stronger intensity of UV light to be produced at the center area between the X-electrode and the Y-electrode.
2. Complicated equivalent circuits being not easy to be driven: As illustrated in
FIG. 5
, different equivalent circuits are produced subject to different discharging paths, and the equivalent circuits formed of the gas-filled capacity Cg and the induction layer capacity Cd cannot be simplified after driving of the electrodes.
3. Limited operation range of driving voltage: Because different discharging paths have different V-I curves, as shown in
FIG. 6
, memory margin is relatively limited to the plasma display panel.
4. False discharge due to uneven accumulation of electric discharges: Because the intensity of electric field is relatively stronger at the center area between the X-electrode and the Y-electrode, space charge tends to be gathered at the electrodes near the center area, as shown in
FIG. 7
, inviting a false discharge.
SUMMARY OF THE INVENTION
The present invention has been accomplished to provide a front substrate for AC plasma display panel, which eliminates the aforesaid problems. It is one object of the present invention to provide a front substrate for AC plasma display panel, which enables the discharging sides of each X-electrode and Y-electrode to be disposed in parallel for producing a uniform electric field and electric plasma to prevent striking of ions against the fluorescent layer on the rear substrate of the plasma display panel, so as to improve the surface life of the plasma display panel. It is another object of the present invention to provide a front substrate for AC plasma display panel, which keeps the discharge paths in the electrodes to be maintained in straight, so as to greatly improve the intensity of the electric field and UV light, and to effectively reduce the driving voltage value. It is still another object of the present invention to provide a front substrate for AC plasma display panel, which enables same equivalent circuits to be produced corresponding to the discharge paths when the electrodes are driven. It is still another object of the present invention to provide a front substrate for AC plasma display panel, which enables electric charges to be evenly accumulated at the electrodes to fix the range of memory effect, so as to prevent a false discharge due to a potential turbulence.
REFERENCES:
patent: 6326727 (2001-12-01), Chung
Chen Kuang-Lang
Hsu Sheng-Wen
Kao Shiuh-Bin
Lin Ching-Hui
Bacon & Thomas
Chunghwa Picture Tubes Ltd.
McPherson John A.
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