Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2002-11-14
2004-05-04
Lee, Wilson (Department: 2821)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S060000, C345S063000, C315S169200
Reexamination Certificate
active
06731256
ABSTRACT:
This application incorporates by reference Taiwan application Serial No. 090128874, filed Nov. 21, 2001.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates in general to a plasma display panel (PDP), and in particular, to a PDP with low firing voltage.
2. Description of the Related Art
The plasma display panel (PDP) has a great potential in the big-size flat display panel market. A conventional PDP usually requires a high firing voltage to transform an ionized gas into plasma. Driving the PDP at high voltage not only requires expensive driving and control components, but may also damages the components thus shortening their life spans.
FIG. 1
illustrates a cross-sectional view of the PDP
100
according to a conventional method. The PDP
100
includes a front substrate
102
and a rear substrate
104
. The spacing between the front substrate
102
and the rear substrate
104
is filled with a mixture of inert gases. The rear substrate
102
has a plurality of sustain electrodes
108
and scan electrodes
110
, which are arranged alternately and in parallel thereon. The front substrate
104
has an address electrode
106
, which is orthogonal to the sustain electrode
108
and the scan electrode
110
. Moreover, a dielectric layer
114
is positioned on the rear substrate
104
, and is covered by a protective layer
116
. A fluorescent layer
118
used for producing fluorescent light is positioned on the address electrode
106
.
The PDP
100
also has a plurality of pixel units
122
, and each pixel unit
122
includes an address electrode
106
, a sustain electrode
108
, and a scan electrode
110
. When the voltage across the sustain electrode
108
and the scan electrode
110
is larger than the firing voltage, the electric field between these two electrodes causes the gas to transform into spatial charges. Then, the spatial charges are transformed into plasma by applying a voltage across the address electrode
106
and the scan electrode
110
, and whether the generated wall charges have a sufficient density or not to light the plasma is also determined. The wall charges density is the critical factor in maintaining the pixel units in the bright (on) state or in the dark (off) state. If it is decided not to maintain the pixel unit in the bright state, the spatial charges of the pixel unit are quickly restored to gas. If it is decided to maintain the pixel unit in the bright state, the sustain electrode
108
and the scan electrode
110
drive the plasma in the pixel unit back and forth for continuous radiating ultraviolet rays. When ultraviolet rays are radiated to the fluorescent layer
118
, the fluorescence will gleam and the gleamed light emitted by the pixel unit will be seen by the user through the transparent rear substrate
104
.
The sustain electrode
108
includes an opaque electrode
124
made by Cr/Cu/Cr or other high conductivity material, and a transparent electrode
126
composed of the ITO. Similarly, the scan electrode
110
includes an opaque electrode
128
composed of Cr/Cu/Cr or other high conductivity material, and a transparent electrode
130
made by the ITO. The material of Cr/Cu/Cr has the characteristics of high conductivity and not being pervious to light. The material of ITO, though being pervious to part of the visible light, has larger resistance and is difficult in manufacturing.
The firing voltage is proportional to the voltage across the sustain electrode
108
and the scan electrode
110
, and corresponds to the gap between those two. Therefore, the transparent electrodes
126
,
130
are respectively used as sustain electrode
108
and the scan electrode
110
in order to decrease the gap and the firing voltage as well. However, the transparent electrodes
126
,
130
also consume larger energy owing to the large resistance and decrease the luminescence efficiency by absorbing part of the visible light. Furthermore, the difficulty in manufacturing for the transparent electrodes
126
,
130
decreases the yield of the PDP
100
.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide a plasma display panel (PDP) has low firing voltage, high illuminating efficiency, and high contrast without using the transparent electrode.
The PDP of the present invention comprises a front substrate, a rear substrate, an addressing electrode, a common electrode, a first scan electrode, a second scan electrode, a first sustain electrode, and a second sustain electrode. The front substrate and a rear substrate are disposed apart in parallel, wherein a gas is filled there between. The addressing electrode positioned on the front substrate and the common electrode is positioned on the rear substrate and is orthogonal to the address electrode. The first scan electrode and the second scan electrode are positioned on the rear substrate, and are respectively at the first side and the second side of the common electrode. The first sustain electrode and the second sustain electrode are positioned on the rear substrate, and are respectively at the first side and the second side of the common electrode. A first pixel unit is defined by the address electrode, the common electrode, the first scan electrode, and the first sustain electrode. A second pixel unit is defined by the address electrode, the common electrode, the second scan electrode, and the second sustain electrode. A priming voltage is applied across the first scan electrode and the common electrode in an erasing period. Whether the first pixel unit is in bright status or not is determined by the address electrode and the first scan electrode in an addressing period. A plasma in the first pixel unit is driven by the first scan electrode, the first sustain electrode back and forth so as to sustain the bright status.
REFERENCES:
patent: 6448947 (2002-09-01), Nagai
patent: 6504519 (2003-01-01), Ryu et al.
Au Optronics Corp.
Lee Wilson
Rabin & Berdo P.C.
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