AC plasma display device

Details AC plasma display device AC plasma display device

2000-11-01

2002-08-20

Wong, Don (Department: 2821)

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

C313S581000

Reexamination Certificate

active

06437514

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an AC plasma display device used for a television receiver, an information display terminal, and other image displays.
BACKGROUND OF THE INVENTION
FIG. 8
illustrates a panel structure example of a conventional AC plasma display device.
Scan electrode
23
and sustain electrode
24
, which are covered by dielectric layer
22
, are arranged on front substrate
21
in a pair in parallel. Protect film
25
, which is an insulating film easy to be discharged, is formed on dielectric layer
22
.
Data electrodes
28
covered by insulating layer
27
are arranged on rear substrate
26
. Partitions
29
are located on insulating layer
27
in parallel with and between data electrodes
28
. Phosphor layer
30
is formed on a surface of insulating layer
27
and side walls of partition
29
. Front substrate
21
and Rear substrate
26
are placed facing to each other sandwiching discharge space
31
, so as for scan electrode
23
and sustain electrode
24
to extend in an perpendicular direction to data electrode
28
.
Discharge space
31
encloses a mixture of xenon and at least one of helium, neon, and argon as an ionizable gas. One of data electrode
28
and one pair of scan electrode
23
and sustain electrode
24
are arranged to form an intersection region sandwiched by two walls of adjacent partitions
29
, and the intersection region corresponds to one discharge cell. Therefore, a plurality of discharge cells
32
are arranged in a plane between front substrate
21
and rear substrate
26
.
Next, an operation of the display panel is described.
First, priming discharges occur between all pairs of scan electrode
23
and sustain electrode
24
, to accumulate wall charge on a surface of protective film
25
.
Second, a scan pulse voltage is applied to one of scan electrode
23
, and a write pulse voltage is applied to data electrode
28
corresponding to discharge cell
32
one of display data is written to. This causes write discharge at the discharge cell
32
to do write operation. The write operations are performed to all of scan electrodes
23
in sequence.
After the write operations are done to all of scan electrodes
23
, a pulse voltage is applied alternately to all of scan electrodes
23
and all of sustain electrodes
24
to cause discharges at the discharge the cells data are written to. This causes phosphor layers
30
to emit lights. The light emissions perform a panel display.
However, when the above-mentioned operation performs an image display, a write operation failure may not make a cell emit a light, even when the cell should emit a light. In other words, it is known that a non-emitting cell arises in the panel on a random basis and may cause display quality to lower. It is considered that a cause of the write operation failure is a discharge delay phenomenon, which is a general characteristic of a discharge phenomenon.
Generally called a discharge delay is a period between an instance when a voltage higher than or equal to a discharge voltage for a gap is applied across the gap; and an instance when a discharge occurs across the gap. The discharge delay includes a formation delay determined by discharge cell structure and panel formation materials, and a statistical delay reflecting probability factor of the discharge. In particular, the statistical delay is micro second orders of period longer than the formation delay, and becomes a main cause of the write operation failure. On the other hand, a few micro seconds, a rather long, is required to one scan electrode for the write pulse to perform the write operation reliably. Therefore, a ratio of the write operation period to a whole drive pulse period becomes large.
SUMMARY OF THE INVENTION
The present invention aims to provide an AC plasma display panel which can reduce a writ operation period and has a high display quality with a reliable write operation by reducing discharge delay in the write operation.
A plasma display panel of the present invention comprises two substrates facing to each other having a plurality of discharge cells arranged in a plane between the two substrates, where each of the cells having an ignition gap, at which a pilot discharge acting as “a pilot flame” occurs to stimulate a main discharge. This construction allows a write discharge to occur reliably with the pilot discharge occurring at the ignition gap acting as “the pilot flame.”


REFERENCES:
patent: 5793158 (1998-08-01), Wedding, Sr.
patent: 5828356 (1998-10-01), Stoller
patent: 6181305 (2001-01-01), Nguyen et al.

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