JP3479874B2 - Driving method and driving device for plasma display - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving method and a driving device for a plasma display, and more particularly to a plasma display panel for collecting and reusing charges.

[0002]

2. Description of the Related Art Generally, a plasma display panel (abbreviation: PDP) has a thin structure, has no flicker, has a large display contrast ratio, and can have a relatively large screen. It is a light-emitting type and has a number of characteristics such as the ability to emit multicolor light by using a phosphor. Therefore, in recent years, it has been widely used in the fields of computer-related display devices and color image displays.

There are two types of PDP, one is an AC type in which an electrode is covered with a dielectric film to indirectly operate in an AC discharge state, and the other is in a DC discharge state in which the electrode is exposed to a discharge space. There is a DC type that operates. The AC type is different from the DC type in that an insulating film including a dielectric film and a protective layer is additionally provided on the electrodes. Depending on the arrangement of electrodes, the AC type has a two-electrode facing type in which electrodes are attached on opposite substrates, a two-electrode surface discharge type in which electrodes are formed on one substrate, and three-electrodes which are further developed. It is classified into the surface discharge type, and the three-electrode surface discharge type is currently the mainstream.

[0004]

In the recent PDP, the number of display cells is remarkably increased due to the multi-gradation display and the large screen.
Therefore, the number of lighted cells to be written increases, the peak current value flowing in the scan electrode at the time of writing discharge increases, and the voltage drop due to the impedance of the electrodes and the drive circuit increases. To prevent this and perform stable writing discharge, it is necessary to apply scan pulses and data pulses having higher voltage values. However, the application of the scan pulse and the data pulse with a high voltage value has a problem that power consumption increases.

Therefore, as a method for reducing the power consumption of the data pulse of the PDP, Japanese Patent Laid-Open No. 8-160901 discloses:
A method of collecting and reusing charges as electric power for driving the data electrodes has been proposed. This method aims to reduce the power consumption in the data pulse by recovering the charge each time the data pulse is written and reusing the charge recovered in the next write.

When this method is adopted, the charge is collected and reused each time the data pulse is written, which has a weak point that the writing time increases. Generally, it takes about 300 to 600 nS to collect and reuse the charges, and this time is required for the number of rows of the PDP.

The time required for the recovery and reuse of such charges hinders the multi-gradation display of a modern PDP.

The present invention has been made in view of the above problems in the prior art. The data pulse driving the data electrode in the PDP driving device is driven for a short time with low power consumption, and more stable writing discharge is performed. An object of the present invention is to provide a plasma display driving method and a driving apparatus that can be achieved.

[0009]

According to a first invention of the present application for solving the above-mentioned problems, a plurality of scan electrodes, a plurality of data electrodes, and a plurality of scan electrodes and a plurality of data electrodes are arranged at respective intersections. In driving the plasma display panel including a plurality of display cells, the charge recovery circuit for recovering the charge remaining in the data electrode after the discharge of the display cell is used to recover and reuse the charge. In the driving method, a first type of applying step of applying a driving voltage from a constant voltage power source to the data electrode, and a charge recovered by a charge recovery circuit is applied to the data electrode, and subsequently a driving voltage from the constant voltage power source is applied. The second type application step of applying to the data electrode, the discharging step of discharging the electric charge remaining in the data electrode to the ground, and the charge recovery time of the electric charge remaining in the data electrode. And a recovery step of recovering the first
A plasma display panel, characterized in that a plurality of first type data pulses including a seed applying step and discharging step and a second type data pulse including a second type applying step and a collecting step are driven in combination. It is a driving method.

Therefore, the plasma of the first invention of the present application
According to the driving method of the display panel, the first type application
As a combination of the process, the second type applying process, the discharging process, and the collecting process, the driving voltage by the constant voltage power source is applied to the data electrode, and subsequently, the electric charge remaining in the data electrode is discharged to the ground. The first type data pulse P1 (see FIG. 5) and the charges recovered by the charge recovery circuit are applied to the data electrode, and subsequently the driving voltage by the constant voltage power supply is applied to the data electrode, and further to this. Subsequently, the second type data pulse P2 (see FIG. 5) in which the charge remaining in the data electrode is recovered by the charge recovery circuit, and the driving voltage by the constant voltage power source is applied to the data electrode, and subsequently, the data electrode is applied to the data electrode. The third type data pulse P3 (see FIG. 5) in which the remaining charges are collected in the charge recovery circuit and the charges collected in the charge recovery circuit are applied to the data electrodes, and subsequently driven by a constant voltage power supply. Pressure is applied to the data electrode, 4 a fourth type of data pulse P4 (see FIG. 5) further charges remaining Then the data electrodes which are released into the ground
There are different types of data pulses, and by combining a large number of these four types of data pulses, it is possible to drive with lower power consumption by collecting and reusing charges than in the conventional technology that drives with only the first type of data pulses. In addition, since the data pulse is applied in a shorter time than in the conventional technique in which only the second type data pulse is used for driving, the driving speed can be increased. That is, there is an advantage that the two effects of low power consumption of the data pulse for driving the data electrode and high-speed driving can be obtained in a well-balanced manner as needed.
However, in the combination of the data pulse of the first type, the data pulse of the second type and the data pulse of the three types and the combination of the data pulse of the first type, the data pulse of the second type and the data pulse of the fourth type, the charge It is excluded because it cannot be practically collected and reused. Here, the data pulse is a drive waveform applied to a lighting cell that performs electrode discharge.

[0011]

Of the above data pulses, the first one of the present application
According to the invention, the first type of process including the first type process and the discharging process
A data pulse and a second type of process and recovery process.
Two types of data pulses are used. No matter how the pulses are combined, the writing of one frame is completed while the charges are collected in the charge collection circuit, and the charges are collected in the charge collection circuit. There is an advantage that sufficient electric charge is stored at the time of reuse.

The second invention of the present application is the method of driving a plasma display panel according to the first invention of the present application , wherein the data electrodes on the panel are bundled into two data electrode groups, and
The method of driving a plasma display panel is characterized in that the steps of (1) and (2) are alternately performed. One of the two steps is
The second type data pulse is applied to each data electrode in one data electrode group in synchronization with each other, and the second data pulse in the one data electrode group is applied.
At the same time the end of the seed application step is a step of applying a first type of de Taparusu each of the data electrodes of the other data electrode groups, and the other, second or other data electrode groups the data pulses <br The data pulse of the first type is applied to each of the data electrodes in the same group in synchronization with each other, and the data pulse of the first type is applied to the one data electrode group at the same time when the second type application step in the other data electrode group is completed. It is a process to do.

Therefore, according to the driving method of the plasma display panel of the second invention of the present application , the data electrodes are bundled into two data electrode groups, and the first data pulse and the second data are applied to the data electrode group. By alternately applying the pulse and the pulse, the reactive power is periodically collected in the charge recovery circuit, so that the amount of charge recovered in the charge recovery circuit becomes stable, and better charge recovery and reuse can be achieved. There is.

Further, the second type data pulse is applied to one data electrode group, and the first type data pulse is applied to the other data electrode group at the same time when the applying process is completed, so that the entire data electrode is formed. There is an advantage that the amount of power consumption in one application of the data pulse becomes constant and stable. Here, the data electrode groups are bundled into two data electrode groups, but the same effect can be obtained when the data electrode groups are bundled into three or more data electrode groups.

The third invention of the present application is the method for driving a plasma display panel according to the second invention of the present application , in which after the application of the scan pulse to the scan electrode is started, the scan is performed by the scan pulse . A method of driving a plasma display panel, which comprises applying a first type data pulse to one data electrode group.

Therefore, according to the driving method of the plasma display panel of the third invention of the present application , first, the second type data pulse is applied to one data electrode group.
Next, when a scan pulse is applied to the scan electrode, electrode discharge occurs due to the scan pulse and the second type data pulse. Next, when the data pulse of the first type is applied to the other data electrode group, the electrode discharge due to the scanning pulse and the data pulse of the first type occurs. Therefore, since the timing of the electrode discharge is different for each data electrode group, the current can be divided and supplied to the scan electrodes, and there is an advantage that the voltage drop applied to the scan electrodes can be suppressed and stable writing can be performed. .

The fourth invention of the present application is the same as the second invention of the present application.
In the driving method of the plasma display panel according to the third invention of the present application, the second type applying step in the other data electrode group is started during the recovery step in the one data electrode group. Is a driving method of.

Therefore, according to the driving method of the plasma display panel of the fourth invention of the present application, the time for performing the collecting process of one data electrode group and the applying process of the second type of the other data electrode group is overlapped. This has the advantage that it can be applied in a shorter period of time.

Further, since the application can be performed in a short time, there is a time margin, and it is possible to select so as to increase the number of second data pulses for which charge is collected and reused, and further application with low power consumption is performed. There is an advantage that you can.

According to a fifth aspect of the present application, the data electrodes on the panel are bundled into two or more data electrode groups, each of the two or more data electrode groups is provided with a dedicated data driving circuit, and the dedicated data driving circuit is provided. Each of the circuits has a dedicated power supply unit, a charge charging circuit that collects electric charges remaining in the data electrodes and charges the capacitors, and a charge discharging circuit that discharges electric charges accumulated in the capacitors and applies the electric charges to the data electrodes. , A power supply drive circuit that applies a drive voltage from a dedicated power supply unit to the data electrode, and an discharge circuit that discharges the electric charge remaining in the data electrode to the ground, and includes a charge discharge circuit, a power supply drive circuit, and a charge charge circuit. provided a first control means for generating a first data pulse by operating control, a second control means for generating the second data pulse by controlling the operation of the discharge circuit and the power drive circuit Be The driving device of the plasma display panel is characterized in that the first control means and the second control means are operated alternately.

[0022]

[0023]

According to the plasma display panel driving apparatus of the fifth invention of the present application, the plasma display panel driving method of the first invention of the present application can be implemented.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a plasma display panel driving method and driving apparatus according to an embodiment of the present invention will be described with reference to the drawings.

First Embodiment FIG. 1 is a diagram showing a first embodiment of the present invention in which a scan pulse ps applied to a scan electrode on one panel, a px applied to a data electrode group DX, and a pulse applied to a data electrode group DY. FIG. 6 is a timing diagram showing a data pulse py and a discharge current pi flowing through a scan electrode. FIG. 2 is a block diagram showing a plasma display panel for realizing the driving method according to the present invention.

As shown in FIG. 2, there are lead-out portions for the scan electrodes and the sustain electrodes at the horizontal ends of the plasma display panel 4. A scan electrode driving circuit 1 that outputs a scan pulse ps to each scan electrode is connected to the take-out portion of the scan electrode. The lead-out portion of the sustain electrode is connected to the sustain electrode drive circuit 2 which outputs a sustain pulse to the sustain electrode.

Further, the data electrodes on the panel are bundled into a data electrode group DX having data electrodes Da1, Da2, ... Dam and a data electrode group DY having data electrodes Db1, Db2 ,. There are two data electrode lead-out portions at the vertical end of the plasma display panel 4. The data drive circuit 3X for outputting the data pulse pdx is connected to the data electrode group DX at the data electrode extraction portion 1. The data driving circuit 3Y that outputs the data pulse pdy is connected to the data electrode group DY at the extraction portion of the other data electrode. The data drive circuit 3X and the data drive circuit 3Y drive the data electrode group DX and the data electrode group DY independently.

FIG. 3 is a detailed circuit diagram of the data driving circuit 3X and the data driving circuit 3Y in the configuration diagram of the plasma display panel of FIG.

The data drive circuit 3X includes a data electrode group DX.
The data driver 9X connected to the data driver 9X, and the power source unit 8X connected to the data driver 9X.

The data driver 9X outputs O in response to writing.
N or OFF FET transistors Qpa1 to Qpa
m and Qna1 to Qnam.

The power supply unit 8X includes a constant voltage power supply unit VX and a charge recovery circuit 10X. The constant voltage power supply unit VX is composed of a constant voltage power supply VD, and the charge recovery circuit 10X includes a capacitor CX having a capacity larger than the electrostatic capacity of the plasma display panel, FET transistors Q1 to Q4, and a diode for turning the switch ON or OFF at high speed. D1 to D2 and an inductance L1 are provided.

The data drive circuit 3Y includes a data electrode group DY.
The data driver 9Y connected to the data driver 9Y, and the power supply unit 8Y connected to the data driver 9Y.

The data driver 9Y outputs O in response to writing.
N or OFF FET transistors Qpb1 to Qpb
n and Qnb1 to Qnbn.

The power supply unit 8Y includes a constant voltage power supply unit VY and a charge recovery circuit 10Y. The constant voltage power supply unit VY includes a constant voltage power supply VD, and the charge recovery circuit 10Y includes a capacitor CY having a capacity larger than the electrostatic capacity of the plasma display panel, FET transistors Q5 to Q8, and a diode for turning the switch on or off at high speed. It is provided with D3 to D4 and an inductance L2.

FIG. 4 shows the scan pulse ps and the data pulse p.
dx, data pulse pdy, and FET transistor Q1
It is a timing diagram of ~ Q8.

The driving operation of the driving method of the plasma display panel according to the first embodiment of the present invention will be described with reference to FIGS. 1, 2, 3 and 4.

First, the charges collected in the capacitor CX are applied to the data electrode group DX. (Hereafter, capacitor CX
The drive waveform in which the electric charge collected in the above is applied to the data electrode group DX is referred to as a data pulse pdx1. As shown in FIGS. 3 and 4, in the field writing period, the FET transistor Q2 is turned on from the period T0 to the period T1 so that the charge stored in the capacitor CX of the charge recovery circuit 10X is transferred to the FET transistor Q2 and the diode. D
Data electrode group DX via 2 and inductance L1
Of the data electrodes to be subjected to write discharge.

Next, the electric charge remaining in the data electrode group DY after the electrode discharge is discharged to the ground. As shown in FIG.
In the period T1, the FET transistor Q8 is turned on to clamp the data electrode group DY to the ground level.

Next, the scan pulse ps is applied to the scan electrodes. As shown in FIG. 4, during the period T1, the scan pulse p
The application of s is started.

Then, in the data electrode group DX, the writing discharge starts in the intersection cell of the scanning pulse ps and the data pulse pdx1 which have reached the potential difference capable of writing discharge. The current value pix1 of the scan electrode at the time of the discharge is shown in FIG.

Next, a constant voltage power supply 8X is applied as a drive voltage to the data electrodes of the data electrode group DX for writing discharge, and a constant voltage power supply 8Y is applied to the data electrodes of the data electrode group DY for writing discharge. To do. (Hereinafter, the drive waveform applied to the data electrode that performs the writing discharge in the data electrode group DX by the constant voltage power supply VD is referred to as a data pulse pdx2, and the writing discharge is performed in the data electrode group DY by the constant voltage power supply VD. The drive waveform applied to the data electrode is referred to as a data pulse pdy2.) As shown in FIG. 4, the FET transistors Q3 and Q7 are operated in the period T2.
Is turned on to turn on the data electrode group DX and the data electrode group DY.
Constant voltage power supply VD
Clamp to level.

Then, in the data electrode group DY, due to the potential difference between the scan pulse ps and the data pulse pdy2,
Writing discharge starts in the intersection cell. The current value piy1 at the time of the discharge is shown in FIG.

After the write discharge, the remaining charges in the data electrode group DX are stored in the capacitor CX of the charge recovery circuit 8X.
To collect. (Hereinafter, the drive waveform for recovering the charges remaining in the data electrode group DX to the charge recovery circuit is referred to as the data pulse p.
It is called dx3. ) As shown in FIGS. 3 and 4, the period T3
From the period T4, the FET transistor Q1 is turned on,
The charge remaining in the data electrode group DX is transferred to the inductance L
1, the diode D1, and the FET transistor Q1 to collect in the capacitor CX.

After the writing discharge, the remaining charges in the data electrode group DY and the scan electrode are discharged to the ground.
(A drive waveform in which the electric charge remaining in the data electrode group DY is discharged to the ground is referred to as a data pulse pdyg.) As shown in FIGS. 3 and 4, the FET transistor Q in the period T3.
1 is turned on to clamp the data electrode group DY and the scan electrode to the ground level.

In the data electrode group DY, the capacitor CY of the charge recovery circuit 8Y is collected during the period in which the charge remaining in the data electrode group DX is recovered by the capacitor of the charge recovery circuit.
Then, the application of the electric charge recovered to the data electrodes in the data electrode group DY for writing discharge is started. As shown in FIGS. 3 and 4, during the period T4 to the period T5, the FET transistor Q6 is turned on, and the charge stored in the capacitor CY of the charge recovery circuit 10Y is passed through the FET transistor Q6, the diode D4 and the inductance L2. The data electrodes are applied to the data electrodes of the data electrode group DX for writing discharge.

Next, the electric charge remaining in the data electrode group DX after the electrode discharge is discharged to the ground. As shown in FIG.
In the period T5, the FET transistor Q4 is turned on to clamp the data electrode group DX to the ground level.

Next, the scan pulse ps is applied to the scan electrodes. As shown in FIG. 4, during the period T5, the scan pulse p
The application of s is started.

Then, in the data electrode group DY, the write discharge starts in the intersection cell of the scan pulse ps and the data pulse pdy1 which have reached the potential difference capable of the write discharge. The current value piy2 at the time of discharging is shown in FIG.

Next, a constant voltage power supply 8X is applied as a drive voltage to the data electrode for writing discharge in the data electrode group DX, and a constant voltage power supply 8Y is applied to the data electrode for writing discharge in the data electrode group DY as driving voltages. To do. As shown in FIG. 4, the FET transistors Q3 and Q7 are turned on during the period T2.
When set to N, the data electrodes for writing discharge in the data electrode groups DX and DY are clamped to the level of the constant voltage power supply VD.

Then, in the data electrode group DX, due to the potential difference between the scan pulse ps and the data pulse pdx2,
Writing discharge starts in the intersection cell. The current value pix2 at the time of the discharge is shown in FIG.

After the write discharge, the remaining charges in the data electrode group DY are transferred to the capacitor CY of the charge recovery circuit 8Y.
To collect. As shown in FIGS. 3 and 4, during the period T7 to the period T8, the FET transistor Q5 is turned on, and the electric charge remaining in the data electrode group DY is collected in the capacitor CY via the inductance L2, the diode D3 and the FET transistor Q5. To do.

After the write discharge, in the data electrode group DX and the scan electrode S, the remaining charges are discharged to the ground. As shown in FIGS. 3 and 4, the FET transistor Q1 is turned on in the period T3 to clamp the data electrode group DX and the scan electrode to the ground level.

By repeating the above, writing discharge is performed.

In the plasma display panel driving method of the first embodiment described above, the data electrode groups are bundled into two groups, but the same effect can be obtained even if the data electrode groups are bundled into three or more groups.

Further, in the driving method of the plasma display panel according to the first embodiment described above, the application to the data electrode is the write discharge, but the same applies to the preliminary discharge and the sustain discharge.

Further, in the driving method of the plasma display panel according to the first embodiment described above, the F switch is used as the changeover switch.
Although the ET transistor is used, other switches have the same effect. Similarly, in the plasma display panel driving method of the first embodiment described above, the N-channel FET transistor is used, but it goes without saying that changing the channel does not affect the present invention.

[0058]

As described above, according to the present invention, the two effects of low power consumption of a data pulse for driving a data electrode and high-speed driving can be obtained in a well-balanced manner, and write discharge can be achieved. By supplying the current to the scan electrodes in a distributed manner, it is possible to achieve stable writing.

[Brief description of drawings]

FIG. 1 is a scan pulse ps applied to a scan electrode, a data pulse pdx applied to a data electrode group DX, a data pulse pdy applied to a data electrode group DY, and a scan in a first embodiment of the present invention. Electrode discharge current pi
FIG.

FIG. 2 is a configuration diagram showing a plasma display panel for realizing a driving method according to the present invention.

FIG. 3 is a detailed circuit diagram of a data driving circuit 3X and a data driving circuit 3Y in the configuration diagram of the plasma display panel of FIG.

FIG. 4 shows scan pulse ps and data pulse p.
dx, data pulse pdy, and FET transistor Q1
It is a timing diagram of ~ Q8.

FIG. 5 is a drive waveform diagram of four types of data pulses used in the present invention.

[Explanation of symbols]

3X, 3Y data electrode drive circuit 4 Plasma display panel 8X, 8Y Power supply unit 9X, 9Y Drive driver 10X, 10Y Charge recovery circuit Da1 to Dam data electrode Db1 to Dbn data electrode DX, DY data electrode group ps scan pulse pdx1, pdx2, pdx3, pdxg data pulse pdy1, pdy2, pdy3, pdyg data pulse pix1, pix2 current value piy1, piy2 current value pi current value P1 first type data pulse P2 second type data pulse P3 third type data pulse P4 second 4 types of data pulse VX, VY constant voltage power supply unit VD constant voltage power supply

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ identification code FI G09G 3/20 G09G 3/28 JW E (58) Fields surveyed (Int.Cl. ⁷ , DB name) G09G 3/28 G09G 3/20 611 G09G 3/20 621 G09G 3/20 623

Claims (5)

(57) [Claims] 1. A plasma display panel including a plurality of scan electrodes, a plurality of data electrodes, and a plurality of display cells arranged at respective intersections of the plurality of scan electrodes and the plurality of data electrodes. In this case, in the driving method of the plasma display panel in which the charge remaining in the data electrode after discharging the display cell is recovered by the charge recovery circuit, the drive voltage from the constant voltage power source is applied to the data electrode. First to apply
Seed application step, a second type application step of applying the charges collected by the charge recovery circuit to the data electrodes, and subsequently applying a drive voltage from the constant voltage power source to the data electrodes, and remaining on the data electrodes And a discharging step of discharging the electric charges remaining in the data electrodes to the charge collecting circuit, the first type data pulse including the applying step of the first type and the discharging step. And a combination of a large number of second type data pulses including the second type applying step and the collecting step, and driving the plasma display panel. 2. The method of driving a plasma display panel according to claim 1, wherein the data electrodes on the panel are bundled into two data electrode groups, and the following two steps are alternately performed. One of the two steps is to apply the second type data pulse in synchronization with each data electrode in one data electrode group, and at the same time when the second type application step in the one data electrode group is completed. , Applying the first type data pulse to each data electrode in another data electrode group, and the other is synchronizing the second type data pulse with each data electrode in the other data electrode group. And applying the data pulse of the first type to the one data electrode group at the same time as the end of the second type application step of the other data electrode group. 3. The method according to claim 2, wherein after the application of the scan pulse to the scan electrode is started, the first type data pulse scanned by the scan pulse is applied to one data electrode group. Driving method for plasma display panel. 4. The plasma display panel according to claim 2 or 3, wherein the second type application step in another data electrode group is started during the recovery step in one data electrode group. Driving method. 5. The data electrodes on the panel are bundled into two or more data electrode groups, each of the two or more data electrode groups is provided with a dedicated data driving circuit, and each of the dedicated data driving circuits is A dedicated power supply unit, a charge charging circuit that collects charges remaining in the data electrodes and charges the capacitors, a charge discharge circuit that discharges charges accumulated in the capacitors and applies the charges to the data electrodes, A power supply drive circuit for applying a drive voltage from the power supply unit to the data electrode, and a discharge circuit for discharging the electric charge remaining in the data electrode to the ground, the charge discharge circuit, the power supply drive circuit, and the charge charge circuit. a first control means for generating a first data pulse by controlling the operation of the bets, to generate a second data pulse by controlling the operation of said power drive circuit and the discharge circuit And second control means are provided, the apparatus for driving a plasma display panel wherein the first control means and second control means, characterized in that it is operated alternately.