Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2001-02-07
2004-04-06
Nguyen, Chanh (Department: 2675)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
Reexamination Certificate
active
06717557
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an AC type plasma display used for a flat type television and information representing display; and a driving apparatus of the display and a driving method of the display. More particularly, the present invention relates to an AC type plasma display for restricting incorrect discharge and a driving apparatus of the display and a driving method of the display.
2. Description of the Related Art
In general, a plasma display panel (hereinafter, abbreviated as PDP) has a number of features including thin structure, flickering-free, large display contrast ratio, possible comparatively large screen, high response speed, spontaneous light emitting type, possible multiple color light emission by use of a phosphor. Thus, recently, in the field of computer associated display device and in the field of color image display or the like, a PDP becomes more popular. This PDP is divided into two types: an AC type in which an electrode is covered with an dielectric to indirectly cause operation in an AC discharge and a DC type in which an electrode is exposed in a discharge space to cause operation in a DC discharge state, depending on its operating system. Further, this AC type PDP is divided into a memory operation type using a discharge cell memory as a driving system and a refresh operation type that does not use such memory as a driving system. The luminescence of the PDP is proportional to discharge count, that is, the number of pulse voltage repetitions. About the above refresh type, when a display capacity increases, the luminescence is lowered. Thus, such a PDP is mainly used as a PDP with its small display capacity.
FIG. 1
is a schematic perspective view illustrating a configuration of one display cell of a conventional AC memory operation type PDP.
Two insulation substrates
1
and
2
made of glass are provided at the conventional AC memory operation type PDP. The insulation substrate
1
serves as a rear substrate, and the insulation substrate
2
serves as a front substrate.
Transparent scan electrodes
3
and transparent sustainment electrodes
4
are provided at an opposite side to the insulation substrate
1
in the insulation substrate
2
. The scan electrode
3
and the sustainment electrode
4
extend in horizontal direction (transverse direction) of the panel. In addition, trace electrodes
5
and
6
are disposed so as to be overlapped respectively on the scan electrode
3
and the sustainment electrode
4
. The trace electrodes
5
and
6
are metallic, for example, and are provided in order to reduce an electrode resistance value between each of these electrodes and an external driving apparatus. Further, there are provided an dielectric layer
12
covering the scan electrode
3
and the sustainment electrode
4
and a protective layer
13
comprising a magnesium oxide or the like, for protecting the dielectric layer
12
from discharge.
Data electrodes
7
orthogonal to the scan electrodes
3
and the sustainment electrodes
4
are provided at an opposite face to the insulation electrode
2
in the insulation electrode
1
. Therefore, the data electrode
7
extends in vertical direction (longitudinal direction) of the panel. In addition, bulkheads
9
for partitioning display cells in horizontal direction are provided. Further, a dielectric layer
14
covering the data electrode
7
is provided, and phosphor layers
11
for converting the ultraviolet rays generated by discharge of a discharge gas into a visible light
10
are formed on each of the side face of the bulkheads
9
and on the surface of the dielectric layer
14
. Discharge gas spaces
8
are allocated by the bulkheads
9
in a space between the insulation substrates
1
and
2
. In this discharge gas space
8
, a discharge gas comprising helium, neon, xenon or the like, or a mixture containing these is charged.
FIG. 2
is a block diagram depicting driving circuits in a conventional AC memory operation type DPD. In addition,
FIG. 3A
is a circuit diagram depicting driving circuits on the scan electrode
3
side;
FIG. 3B
is a circuit diagram depicting driving circuits on the sustainment electrode
4
side; and
FIG. 3C
is a circuit diagram depicting a data driver
28
.
There are provided display cells that emit light at a cross point between the scan electrode
3
and sustainment electrode
4
provided in parallel to each other and the data electrodes
7
orthogonal to the electrodes
3
and
4
. Therefore, one scan electrode, one sustainment electrode, and one data electrode are provided in one display cell. Thus, the number of display cells on the entire screen is “n+m”, where the number of scanning and sustainment electrodes is “n”, and the number of data electrodes is “m”.
In addition, a removal portion of a respective one of the scan electrodes
3
and sustainment electrodes
4
is provided at the end in the horizontal direction of the display panel in a conventional PDP, and a driving circuit is connected to this removal portion.
A scan pulse driver
21
for outputting scan pulses to each of the scan electrodes
3
is provided as a driving circuit at the scan electrode
3
side. In addition, a reset driver
30
for outputting reset pulses common to all of the scan electrodes
3
; a sustainment driver
23
for outputting sustainment pulses; an erasing driver
24
for applying erasing pulses; a scan base driver
25
for outputting scan base pulses; and a scan voltage driver
26
for outputting a scan voltage are connected to a scan pulse driver
21
.
On the other hand, a sustainment driver
27
for applying sustainment pulses to the entirety of the sustainment electrode
4
is provided as a driving circuit at the sustainment electrode
4
side.
Further, a removal portion of the data electrodes
7
is provided at the end in the vertical direction of the display panel in a conventional PDP, and to this removal portion, a data driver
28
is connected as a driving circuit.
A controller
29
for switching operation of each driver according to a video signal is provided.
An operation of a conventional PDP configured as described above will be described hereinafter.
FIG. 4
is a timing chart showing a method of driving the conventional PDP.
In
FIG. 4
, periods
1
-f and
1
-(f+
1
) are reset periods of a sub-field of a respective one of the frames “f” and “f+
1
”. In these reset periods, respective rectangular wave reset pulses Ppr-s and Ppr-c are applied to the entirety of the scan electrodes S and the entirety of the sustainment electrodes C.
In the reset periods
1
-f and
1
-(f+
1
), reset discharge is generated in a discharge space in the vicinity of a gap between the scan electrode and the sustainment electrode of all display cells, depending on a positive polarity rectangular wave applied to the scan electrode and a negative polarity rectangular wave applied to the sustainment electrode. In this manner, the generation of active particles which makes it easy to generate discharge of display cells is performed. At the same time, the negative polarity wall charge is accumulated on the scan electrode S, and the positive electrode wall charge is accumulated on the sustainment C. However, these wall charges are almost eliminated by self-erasing discharge in a subsequent fall of the pulse.
Then, the erasing pulse Pe-s is applied to the entire of the scan electrodes S, whereby the wall charges which are not erased by self-discharge are completely erased.
In
FIG. 4
, periods
2
-f and
2
-(f+
1
) are addressing periods of a sub-field of a respective one of the frames “f” and “f+
1
”. In these addressing periods
2
-f and
2
-(f+
1
), the entirety of the sustainment electrodes C is maintained to a GND level. In addition, a negative polarity scan pulse Psc-s is applied to a scan electrode Si in a row in which writing is to be performed, and a positive polarity data pulse Pd is applied to a data electrode D. As a result, both of these pulses are applied, and an opposite discharge is gen
Hayes & Soloway P.C.
NEC Corporation
Nguyen Chanh
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