JP2000305518A - DC memory plasma display panel and driving method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a panel having an improved luminous efficiency, and a reduced power consumption by reducing various kinds of driving pulse reactive powers, in a DC memory plasma display panel. SOLUTION: This DC memory plasma display panel is so composed that three discharge electrodes are installed in one display cell, and that a writing discharge corresponding to an image signal is generated between a scanning discharge electrode(SCEL) and a display discharge electrode(DIEL), and that a sustained discharge for sustaining the discharge is generated between the scanning discharge electrode(SCEL) and a sustained discharge electrode (SUEL).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to DC memory driving of a plasma display panel (referred to as PDP),
The present invention relates to a DC memory plasma display panel and a driving method thereof, in which suspicion of a display image caused by an address pulse is eliminated by generating a sustain discharge with a constant current, and luminous efficiency is improved by suppressing a sustain discharge current. It is.

[0002]

2. Description of the Related Art The provision of a memory function in a DC-type PDP enhances the light emission luminance of the PDP and enables half-tone display. Japanese Patent Application Laid-Open No.
No. 88886 and the like. In this pulse memory type PDP, one display cell, which is the minimum unit constituting a pixel, has two discharge electrodes, ie, an anode and a cathode. You are using Further, in the pulse memory type PDP, the sustain discharge is generated in a pulse shape by the sustain pulse.

As a driving method for driving a DC type PDP with a DC memory, there is Japanese Patent Application No. 8-213238. Also in this DC memory driving method, one display cell, which is the minimum unit constituting a pixel, has two discharge electrodes, ie, an anode and a cathode.
A pair of discharge electrodes is used. However, unlike the pulse memory system, the sustain discharge is continuously generated. Also in this DC memory system, the address discharge and the sustain discharge are generated by the same discharge electrode pair, and the sustain discharge current is affected by the address pulse. Therefore, by adding a compensation pulse near the address pulse, the address pulse is generated. The turbidity of the displayed image caused by the above is reduced.

[0004]

In the above-mentioned pulse memory type PDP, since the sustain discharge is generated in a pulse form by the sustain pulse, the discharge sustain voltage increases and the discharge sustain current increases. The luminous efficiency was lower than in the case where the device was used with the minimum sustain discharge current. In addition, since the sustain pulse is applied in a pulse shape, the reactive power caused by charging and discharging the capacitance component of the panel is also large.

On the other hand, in the above-described DC memory type PDP, the sustain discharge is made continuous, so that the sustain current is suppressed and the reactive power due to the sustain pulse is reduced. Since the sustain discharge is affected by the address pulse due to the same discharge electrode pair, a compensation pulse for removing the turbidity generated in the display image is added near the address pulse. For this reason, reactive power is newly generated by the additional pulse, and the power consumption is increased accordingly. In addition, since the voltage waveform of the display electrode has three values, the configuration of the driving circuit is complicated.

[0006] A method of utilizing a positive column discharge to increase the luminous efficiency of a PDP is known. In this case, it is necessary to increase the distance between an anode and a cathode used for the discharge. The discharge voltage, especially the write voltage, rises significantly. In the pulse memory type and DC memory type PDPs, since only one anode and one cathode are provided, a write discharge and a sustain discharge are performed between a common discharge electrode pair. In this case, a high writing voltage was required.

Accordingly, an object of the present invention is to realize a DC memory drive in which a sustain discharge current is constant during a sustain discharge period in a PDP by generating an address discharge and a sustain discharge with different combinations of discharge electrodes. Accordingly, an object is to improve luminous efficiency, reduce reactive power due to various driving pulses, and reduce power consumption of a PDP.

[0008]

In order to achieve the above object, a DC memory plasma display panel according to the present invention is characterized in that in a DC memory plasma display panel, one display cell as a minimum unit constituting a pixel is provided. It has three discharge electrodes, a scan discharge electrode, a display discharge electrode, and a sustain discharge electrode, and generates an address discharge according to an image signal between the scan discharge electrode and the display discharge electrode to maintain the discharge. A sustain discharge is generated between the scan discharge electrode and the sustain discharge electrode.

Further, the DC memory plasma display panel according to the present invention according to claim 2 is a minimum unit constituting a pixel.
One display cell has a scanning discharge electrode, a sustaining discharge electrode, and a display discharge electrode whose surface is covered with a dielectric or a phosphor, and performs an address discharge according to an image signal between the scanning discharge electrode and the display discharge electrode. It is characterized in that it is configured to be generated by an AC discharge and to generate a sustain discharge for sustaining the discharge between the scan discharge electrode and the sustain discharge electrode.

Further, in the DC memory plasma display panel according to the present invention, the distance between the scanning discharge electrode and the display discharge electrode is shorter than the distance between the scanning discharge electrode and the sustaining discharge electrode. It is a special teaching that it is arranged.

According to a first aspect of the present invention, there is provided a method of driving a DC memory plasma display panel for driving a panel, comprising the steps of: applying a write pulse corresponding to a display image to a display discharge electrode; A sustain bias pulse is applied to the scan discharge electrode so as to have a constant voltage during the sustain discharge period, and a constant current is applied between the scan discharge electrode and the scan discharge pulse for generating an address discharge between the display discharge electrode and the sustain discharge electrode. A sustain pulse for generating a sustain discharge is added.

[0012]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. First, prior to the description of the DC memory plasma display panel and the driving method of the present invention, a conventional DC PDP and its driving method will be described. FIG. 4 shows a schematic configuration of a conventional DC PDP.

In FIG. 4, D1, D2,..., D
(2j−1), D2j,..., D2m are “1” corresponding to a digital image signal (hereinafter referred to as image data),
This is a display electrode to which a “0” signal is applied. Also, K1,
K2,..., K (i-1), Ki,..., Kn are scanning electrodes to which scanning signals are applied in accordance with the scanning order. A1, A2,..., Aj,..., Am start the discharge of a display cell (for example, DCi (2j-1)) formed at the intersection of the display electrode and the scan electrode. Auxiliary electrodes (usually anodes) necessary for speeding up (priming effect), and auxiliary discharge cells for priming are provided at intersections (for example, AC (i-1) j) of these auxiliary electrodes and the scanning electrodes. It is formed. In this case, in one display cell, there are only two discharge electrodes, a scan discharge electrode connected to the scan electrode and a display discharge electrode connected to the display electrode.

Next, the waveforms of the pulses applied to the respective electrodes of the above-mentioned PDP, that is, the display electrode, the scanning electrode, and the auxiliary electrode in the prior art using the pulse memory system will be described with reference to FIG.

In FIG. 5, a display electrode Dj (see FIG. 4;
The same applies hereinafter) to which an address pulse WP for causing an address discharge in accordance with image data is applied. Scan pulse SK
P and the sustain pulse SP are sequentially applied from the first scan electrode. In the auxiliary discharge cell ACij, an auxiliary discharge is performed by the auxiliary discharge pulse SA applied to the auxiliary electrode Aj, and in the display discharge cell DCi (2j-1). , The address discharge is performed by the write pulse WP applied to the display electrode at substantially the same timing as the scan pulse SKP, and the display discharge is started.

In the display discharge cell which has started the discharge, a sustain pulse SP (sustain pulse S) having a period T applied to the scan electrode is applied.
P may be applied to the display electrode at this timing) to maintain the display discharge. To stop the sustain discharge, stop applying the sustain pulse SP to the scan electrode,
The discharge by the sustain pulse may be stopped once or more.

Here, the waveform applied to the auxiliary electrode is shown by a rectangular wave voltage having a period T. However, the auxiliary discharge may be generated at the timing of the scan pulse applied to the scan electrode. It may be driven using a current circuit.

As described above, the pulse memory type DC type P
In the case of DP, the sustain discharge current is not constant and discharge occurs at the application timing of the sustain pulse SP.
Discharge. Therefore, in order to maintain the discharge by the sustain pulse SP, a higher voltage is required than when the discharge is continuously generated and maintained. As a result, the sustain discharge current is increased, and the luminous efficiency of the PDP is reduced. In addition, since the sustain pulse SP is applied to the scan electrodes at the period T, the reactive power for charging and discharging the capacitance component of the PDP becomes considerably large, and the power consumption is increased.

Next, the waveforms of the pulses applied to the display electrodes and the scanning electrodes of the above-described PDP in the prior art using the DC memory system will be described with reference to FIG. The waveform applied to the auxiliary electrode is the same as that in the case where the pulse memory system is used, and a description thereof will be omitted.

In FIG. 6, a display electrode Dj (see FIG. 4;
The same applies to the following), a compensation pulse CP is added in the direction different from the polarity of the address pulse WP in the vicinity of the address pulse WP for generating the address discharge according to the image data and the address pulse.
The scan pulse SKP and the sustain pulse SP are sequentially applied from the first scan electrode. However, unlike the pulse memory system, the sustain pulse SP is not a pulse of the cycle T but maintains the same voltage during the sustain discharge period. Again, in this case,
In one display cell, there are only two discharge electrodes, a scan discharge electrode connected to the scan electrode and a display discharge electrode connected to the display electrode.

In the display cell DCi (2j-1),
Similarly to the pulse memory method, the address discharge is performed by the address pulse WP applied to the display electrode at substantially the same timing as the scan pulse SKP, and the display discharge is started. In the display cell which has started the discharge, the discharge is maintained between the display electrode and the scan electrode by the sustain pulse SP applied to the scan electrode. In this case, the sustain discharge current flows continuously, but the discharge sustain current is not constant because the address pulse WP and the compensation pulse CP are applied to the display electrodes during the sustain discharge period. The sustained display discharge is the sustain pulse S
It stops when P ends.

As described above, in the conventional DC memory system,
By maintaining the sustain discharge continuously, the sustain current is suppressed and the reactive power due to the sustain pulse SP is reduced. However, since the address discharge and the sustain discharge are generated by the same discharge electrode pair, the sustain current is reduced. Since the discharge is affected by the address pulse WP, the compensation pulse CP for removing the turbidity generated in the displayed image is added near the address pulse WP. Therefore, reactive power is newly generated by the compensation pulse CP, and power consumption is increased accordingly.

In order to increase the luminous efficiency of the PDP, a method utilizing a positive column discharge is known. In this case, it is necessary to increase the distance between electrodes used for the discharge. The discharge voltage, especially the write voltage, increases significantly. In the pulse memory type and DC memory type PDPs, since only one anode and one cathode are provided, the address discharge and the sustain discharge are performed between the common discharge electrode pair. In the case of using discharge, a high write voltage was required.

A DC memory type PDP according to the present invention and a method for driving the same in which opacity of a displayed image is reduced and reactive power is reduced even when driven with a low sustain discharge current of a constant value in order to increase luminous efficiency. Will be described.

FIGS. 1 and 2 show a layout diagram of discharge electrodes in one display cell (FIGS. 1A and 1B) and a connection diagram (FIG. 2) of the DC memory plasma display panel of the present invention. I have. The difference between the present invention and the conventional driving method is clear when FIG. 1, FIG. 2 and FIG. 4 are compared. Here, FIG.
(A) is a plan view of a display cell, and (b) is a cross-sectional view of the cell A1-A2.

In FIG. 1 and FIG. 2, one display cell, which is the minimum unit constituting a pixel of a PDP, has three discharge electrodes of a scan discharge electrode SCEL, a display discharge electrode DIEL, and a sustain discharge electrode SUEL. ing. Also,
Red in the cell due to the ultraviolet light generated by the discharge,
A phosphor PH that emits light of blue, green, or the like is applied. The electrodes in these cells are connected to a scanning electrode Ki, a display electrode Dj, and a sustain electrode SUj, respectively, as shown in FIG. In FIG. 2, only the sustain discharge electrode SUEL has the current limiting resistor R, but the write discharge electrode DIE
A similar current limiting resistor R may be added to L and the auxiliary cell ACij.

Next, each electrode of the DC memory PDP of the present invention, that is, the scanning electrode Ki, the display electrode Dj, and the sustain electrode S
The waveforms of the pulses applied to Uj will be described with reference to FIG. Here, the waveform applied to the auxiliary electrode Aj is the same as the waveform in the related art, and thus the description is omitted.

In FIG. 3, a display electrode Dj (see FIG. 2;
The same applies hereinafter) to which an address pulse WP for causing an address discharge in accordance with image data is applied. Scan pulse SK
The P and the sustain pulse SP are sequentially applied from the first scan electrode, but the sustain pulse SP is not a pulse of the cycle T, but maintains the same voltage during the sustain discharge period. The voltage of the sustain pulse is set to a voltage at which no discharge occurs between the scan discharge electrode SCEL and the display discharge electrode DIEL. On the other hand, the time SB during which the sustain pulse SP is applied to any one of the n scan electrodes is applied to the sustain electrode SUj.
A sustain bias pulse S such that a constant voltage is applied to PW
Apply BP.

In the display cell DCi (2j-1),
The address pulse WP applied to the display electrode at the same timing as the scan pulse SKP causes the scan discharge electrode SCEL
And the display discharge electrode DIEL to perform an address discharge to start a display discharge. In the display cell that started discharging,
Discharge is maintained between sustain discharge electrode SUEL and scan discharge electrode SCEL by sustain pulse SP applied to scan electrode Ki. Sustain pulse S applied to scan electrode Ki
Since P is set to a voltage at which no discharge occurs between the display discharge electrode DIEL and the scan discharge electrode SCEL, the sustain discharge occurs only between the scan discharge electrode SCEL and the sustain discharge electrode SUEL. Therefore, the sustain discharge current is equal to the display electrode D.
j is not affected by the write pulse WP applied to j, and no turbidity of the displayed image occurs.

The sustain discharge is generated between the scan electrode to which the sustain pulse SP having the constant voltage is applied and the sustain electrode to which the sustain bias pulse SBP having the constant voltage is applied during the sustain discharge period. The current has a constant value.
For this reason, the sustain discharge current can be reduced to the minimum sustain discharge current of the display cell, and the luminous efficiency of the panel can be improved. Further, since it is not necessary to apply a short-period pulse such as a compensation pulse to the display electrode Dj and the sustain electrode SUj, it is possible to greatly reduce the reactive power for charging and discharging the capacitance component of the panel.

Further, as shown in FIG.
By making the distance between the CEL and the display discharge electrode DIEL shorter than the distance between the scan discharge electrode SCEL and the sustain discharge electrode SUEL, the sustain discharge is generated between the long discharge electrode pairs, and the address discharge is generated between the short discharge electrode pairs. Can be caused. For this reason, a positive column with good luminous efficiency can be used for sustain discharge, which mainly contributes to panel light emission,
The writing voltage does not increase, and it becomes possible to drive the panel with the same voltage as that of the conventional panel.

In the above embodiment, the scanning discharge electrode SCEL is used.
Are a cathode, a display discharge electrode DIEL and a sustain discharge electrode SU.
The EL is used as the anode, but the polarity of the voltage applied to each electrode is inverted so that the scan discharge electrode SCEL is used as the anode, the display discharge electrode DIEL, and the sustain discharge electrode SUEL.
It is obvious that can be used as a cathode.

In the above embodiment, the sustain electrodes SUj
Is 2m, which is the same as the number of display electrodes Dj. However, since the same waveform can be applied to all the sustain electrodes SUj, for example, the adjacent sustain discharge electrodes are connected to the same sustain electrode through the resistor R. It is also possible to reduce the number of sustain electrodes by connecting them.

Further, in the above-described embodiment, the phosphor PH is applied to the inside of the display cell. However, it is not necessary to apply the phosphor for those utilizing the luminescence of the gas used. In the above-described embodiment, the display discharge electrode DIEL is exposed to the discharge space, and the address discharge is generated by DC discharge. However, the display discharge electrode DIEL is covered with a dielectric or a phosphor to cover the display discharge electrode DIEL. Even when the address discharge is generated by the AC discharge without being exposed to the discharge space, the sustain discharge can be discharged by the DC memory, and the effect of the present invention is not changed.

In the above-described embodiment, the auxiliary cell ACij is arranged in the PDP.
If the address discharge can be stably generated between the display cell and the display discharge electrode DIEL, the auxiliary cell ACij is not required.

[0036]

According to the panel structure and the driving method of the present invention, the luminous efficiency of the panel can be improved by making the sustain discharge a constant low current, and the reactive power which does not contribute to the luminescence of the panel can be improved. Can be reduced, and the power consumption of the PDP can be reduced.

[Brief description of the drawings]

FIG. 1 is an electrode layout diagram in one display cell in a plasma display panel of the present invention.

FIG. 2 is a connection diagram of each electrode in the plasma display panel of the present invention.

FIG. 3 is a pulse waveform chart applied to each electrode when driving each electrode of a PDP according to the driving method of the present invention.

FIG. 4 is a schematic configuration diagram of a conventional DC PDP.

FIG. 5 is a diagram showing a pulse waveform applied to each electrode of a PDP in a conventional technique using a pulse memory system.

FIG. 6 shows P in the prior art using the DC memory system.
FIG. 4 is a pulse waveform diagram applied to each DP electrode.

[Explanation of symbols]

SCEL scanning discharge electrode DIEL display discharge electrode SUEL sustain discharge electrode PH phosphor D1, D2, ---, D2j-1, D2j, ---, D2m
Display electrodes K1, K2, ---, Ki-1, Ki, ---, Kn
Scan electrode A1, ---, Aj, ---, Am
Auxiliary electrodes SU1, SU2, ---, SU2j, ---, SU2m
Sustain electrode WP Write pulse SKP Scan pulse SP Sustain pulse SBP Sustain bias pulse SBPW Sustain bias pulse width CP Compensation pulse

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[Procedure amendment]

[Submission date] April 23, 1999 (1999.4.2
3)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

Further, in the DC memory plasma display panel according to the present invention, the distance between the scanning discharge electrode and the display discharge electrode is shorter than the distance between the scanning discharge electrode and the sustaining discharge electrode. Are arranged.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Mizuyoshi Gozawa 1-10-11 Kinuta, Setagaya-ku, Tokyo Japan Broadcasting Research Institute (72) Inventor Juzo Koura 1-kinuta, Setagaya-ku, Tokyo No. 10-11 Japan Broadcasting Corporation Broadcasting Research Institute (72) Inventor Yoshimichi Takano 1-10-11 Kinuta, Setagaya-ku, Tokyo Inside Japan Broadcasting Corporation Broadcasting Research Institute (72) Inventor Masahiko Seki Kinuta, Setagaya-ku, Tokyo 1-10-11 Japan Broadcasting Corporation Japan Broadcasting Research Institute F term (reference) 5C040 FA02 FA04 GB02 GB14 LA18 5C058 AA11 BA04 BA05 BA26 BB01 5C080 AA05 BB05 CC03 DD26 EE28 FF09 HH02 HH05 JJ02 JJ04 JJ06

Claims (4)

[Claims] In a DC memory plasma display panel, one display cell, which is a minimum unit forming a pixel, has three discharge electrodes, ie, a scan discharge electrode, a display discharge electrode, and a sustain discharge electrode. A corresponding address discharge is generated between the scan discharge electrode and the display discharge electrode, and a sustain discharge for sustaining the discharge is generated between the scan discharge electrode and the sustain discharge electrode. DC memory plasma display panel. 2. A DC memory plasma display panel having a scan discharge electrode, a sustain discharge electrode, and a display discharge electrode whose surface is covered with a dielectric or a phosphor in one display cell which is a minimum unit constituting a pixel. Then, an address discharge corresponding to the image signal is generated by an AC discharge between the scan discharge electrode and the display discharge electrode, and a sustain discharge for sustaining the discharge is generated between the scan discharge electrode and the sustain discharge electrode. A DC memory plasma display panel having the above configuration. 3. The panel according to claim 1, wherein the discharge electrodes are arranged such that a distance between the scan discharge electrode and the display discharge electrode is shorter than a distance between the scan discharge electrode and the sustain discharge electrode. Characteristic DC memory plasma display panel. 4. In driving the panel according to claim 1, an address pulse according to a display image is applied to the display discharge electrode, and a constant voltage is applied to the sustain discharge electrode during the sustain discharge period. Apply a sustain bias pulse like this
A DC memory plasma display panel, wherein a scan pulse for generating an address discharge between the scan discharge electrode and a display discharge electrode and a sustain pulse for generating a sustain discharge of a constant current between the scan discharge electrode and the sustain discharge electrode are added. Drive method.