JP2000276107A - Driving device for plasma display panel and its driving method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress jamming electromagnetic waves from being generated at data electrodes of a plasma display panel. SOLUTION: When driving pulses A, B are applied to every other line with respect to plural lines of data electrodes of a PDP 1 by a data driver 3, for example, in a period when the voltage of a data electrode 2 is stabilized by the driving pulse A, timings of the rising and falling of the voltage of a data line 2 by the driving pulse B are made so as to be generated. Thus, transient speeds between driving pulses A, B are made to be reduced by the interference due to capacitance between respective electrodes 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a plasma display panel data driving apparatus suitable for driving data of a plasma display panel and a driving method thereof.

[0002]

2. Description of the Related Art Plasma display panels (hereinafter referred to as P
Data driving in DP is a method of outputting necessary image data in synchronization with a line scanning cycle. In recent years, there has been a demand for higher definition of PDPs, faster writing time and higher stability.

In order to meet this demand, for example, in Japanese Patent Application Laid-Open No. Hei 8-305319, the timing of the data drive pulse is shifted in a plurality of divided screen blocks so that the write discharge current is temporally dispersed.

That is, as shown in FIG. 6, data electrodes Da1 to Da2 of a plasma display panel (PDP) 9 are provided.
K is divided into two or more data blocks G1 and G2. Then, at the time of the address discharge, the application timing of the data pulse within one scan pulse period is changed to the data block G.
1 and G2.

[0005] The shift time is about Ti / 5 to Ti, where Ti is the discharge duration time of the display cell 23. As a result, the peak of the discharge current at the time of the address discharge flowing through the scan electrodes Sc1 to Scj is reduced, and the voltage drop due to the impedance of the electrodes and the drive circuit is reduced.
Further, the voltage applied to the display cell 23 is stabilized by the discharge current having a small peak value, and stable address discharge can be performed. Note that reference numerals Su1 to Suj in the figure denote sustain electrodes.

In Japanese Patent Application Laid-Open No. 221032, the current load of the data driving power supply is averaged by dispersing the rising and falling timings of the pulse width modulation signal. As a result, the data electrode drive signal is faithfully reproduced, so that a beautiful image is displayed.

[0007]

However, in the former prior art described above, as shown in FIG. 6, the data electrodes Da1 to Da2K driven at different timings are divided into two or more data blocks G1 and G2. However, the data electrodes Da1 to Da2K driven at different timings are not arranged so as to be adjacent to each other.

Therefore, the data electrodes Da1 to Da2K of the data blocks G1 and G2 are simultaneously driven at the same timing. As a result, especially when all the display cells 23 are written, there is a disadvantage that the transient of the pulse applied to the data electrodes Da1 to Da2K becomes steep, and a strong interference electromagnetic wave is generated.

On the other hand, in the latter prior art described above, two temporally continuous gray-scale data of each data electrode are grouped into one pulse width modulation signal, so that the current load of the power supply is averaged. Therefore, the generation of the above-mentioned interfering electromagnetic waves is suppressed.

However, in the latter prior art, since the aim is to average the current load of the power supply, it is impossible to suppress the generation of the interfering electromagnetic wave at the data electrode of the PDP.

The present invention has been made in view of the above circumstances, and provides a plasma display panel data driving apparatus and a driving method thereof capable of suppressing the generation of interfering electromagnetic waves at the data electrodes of the plasma display panel. Is what you can do.

[0012]

According to a first aspect of the present invention, there is provided a plasma display panel data driving apparatus, comprising: a plasma display panel having a plurality of data electrodes; A data driver for providing a drive pulse, wherein the data driver uses the first or second drive pulse to control the voltage of the data electrode by the second or first drive pulse during a period in which the voltage of the data electrode is stable. It is characterized in that rise and fall timings are generated. In addition, the data driver can supply the first and second drive pulses to the data electrodes every few lines. In addition, the data driver may use the first drive pulse as a flat enable signal and the second drive pulse as a signal giving a control timing at which the rise and fall of the voltage of the data electrode are shifted. it can. The method of driving a plasma display panel according to claim 4, wherein a first step of applying first and second drive pulses to every other one of the plurality of data electrodes of the plasma display panel; And the second step of generating the timing of the rise and fall of the voltage of the data electrode by the second or first drive pulse during the period when the voltage of the data electrode is stable by the drive pulse of be able to. Further, the first step may include a third step of applying the first and second drive pulses every several lines to the data electrode. In the second or third step, the step of setting the first drive pulse to a flat enable signal and the step of giving the second drive pulse a control timing at which the rise and fall of the voltage of the data electrode are shifted. And a step of generating a signal. In the plasma display panel data driving device and the driving method according to the present invention, the data driver uses a plurality of data electrodes of the plasma display panel,
When applying the first and second drive pulses every other line, the first
Alternatively, during the period in which the voltage of the data electrode is stabilized by the second drive pulse, the timing of the rise and fall of the voltage of the data electrode by the second or first drive pulse is generated. In this case, the transient speed of the driving pulse is reduced by the interference due to the capacitance.

[0013]

Embodiments of the present invention will be described below.

(First Embodiment) FIG. 1 is a diagram showing a first embodiment of a plasma display panel data driving apparatus according to the present invention, and FIGS. 2 and 3 are diagrams showing the plasma display panel data driving apparatus of FIG. It is a figure for explaining operation of an apparatus.

FIG. 1 shows a plasma display panel data driver (hereinafter referred to as a PDP data driver).
Includes a plasma display panel (hereinafter, referred to as PDP) 1. The PDP 1 is provided with a plurality of data electrodes 2.

Each data electrode 2 is driven by a data driver 3. In addition, data electrode 2
Are supplied with a drive pulse A and a drive pulse B amplified to a predetermined voltage amplitude by the data driver 3.

The driving pulse A as the first driving pulse and the driving pulse B as the second driving pulse are applied to the data electrode 2 every other line. The timings of the driving pulse A and the driving pulse B are shifted. That is, the driving pulse A and the driving pulse B
The rising and falling timings do not match.

Thus, for example, when the voltage of the data electrode 2 is stabilized by the drive pulse A, the timing of the rise and fall of the voltage of the data electrode 2 by the drive pulse B is generated. As a result, for example, PD
In the case where all the pixels of P1 are turned on, the rising and falling timings of the voltages of all the adjacent data electrodes 2 are different from each other, so that the electromagnetic interference in the PDP 1 is reduced.

Next, the operation of the PDP data driving device having such a configuration will be described with reference to FIGS.

First, as shown in FIG. 2, a capacitance 4 is formed between adjacent data electrodes 2.
Here, when all the data drivers 3 apply the drive pulse A and the drive pulse B shown in FIG. 1 to the data electrode 2 at the same timing, no action is taken because no terminal voltage is generated in each of the capacitances 4. Does not occur.

On the other hand, as described above, if the rising and falling timings of the driving pulse A and the driving pulse B are shifted and applied to the data electrodes 2 alternately, the terminal voltage of each data electrode 2 changes. I do. At this time,
Each capacitance 4 performs charging and discharging.

Here, since the data driver 3 has a constant output impedance, as a result, the change in the voltage of the data electrode 2 becomes gentle due to charging and discharging by the capacitance 4.

That is, the driving pulse A and the driving pulse B
As shown in FIGS. 3A and 3B, the rising and falling timings are different from each other. For this reason,
In any case, since the capacitance 4 shown in FIG. 2 acts, the transient becomes dull as shown in FIGS. 3 (c) and 3 (d).

As a result, generation of interfering electromagnetic waves at data electrode 2 of PDP 1 is suppressed.

As described above, in the first embodiment, when the driving pulses A and B are applied alternately to the plurality of data electrodes 2 of the PDP 1 by the data driver 3, the data pulses are applied by the driving pulse A, for example. During the period in which the voltage of the electrode 2 is stable, the timing of the rise and fall of the voltage of the data electrode 2 by the drive pulse B is generated. , B to reduce the transient speed.

As a result, the energy of the harmonic component is reduced, and it is possible to suppress the generation of an interfering electromagnetic wave at the data electrode 2 of the PDP 1.

Further, in the first embodiment, the reduction in the transient speed at the data electrodes 2 due to the drive pulses A and B is caused by the action of the capacitance 4 between the data electrodes 2. It is not necessary to add extra parts, and the cost of the apparatus can be avoided.

Also, by applying three types of drive pulses having different rising and falling timings to every other data electrode 2 of the PDP 1, three types of driving are performed for each pixel of RGB. Pulses can be assigned, and the drive timing can be optimized for the write characteristics of RGB.

(Second Embodiment) FIG. 4 shows a plasma display panel data driving apparatus (hereinafter referred to as PD) of the present invention.
FIG. 6 is a diagram illustrating a second embodiment of a P data driving device).

In the second embodiment, for example, FIG.
As shown in (a), the drive pulse A is a flat drive signal.

In this case, the driving pulse A becomes a flat enable signal, and the voltage waveform of the data electrode 2 is shown in FIG.
As shown in (c), it has a change point synchronized with the line scanning cycle.

On the other hand, the drive pulse B shown in FIG. 4B is provided with a control timing at which the rise and fall of the voltage of the data electrode 2 are always shifted. In addition, the voltage waveform of the data electrode 2 to which the drive pulse B is applied has a blunt transient as shown in FIG.

As described above, in the second embodiment, the drive pulse A is a flat drive signal, and the drive pulse B is given a control timing at which the rise and fall of the voltage of the data electrode 2 are always shifted. I did it.

As a result, in the transient state of one data electrode 2, a time relationship in which the voltage of the other data electrode 2 is stable is formed with each other.
The effect of charging and discharging of the capacitance 4 during the operation is obtained.

Regarding the driving pulse B, even when there are a plurality of timings, the driving pulse B having different rising and falling timings is distributed to adjacent ones on the data electrode 2 array. The above-described operation by the charging and discharging of the capacitance 4 is obtained.

In the second embodiment, the drive pulse A is a flat drive signal, and the drive pulse B is given such a control timing that the rising and falling of the voltage of the data electrode 2 are always shifted. Although the above description has been made, the drive pulse B may be a flat drive signal, and the drive pulse A may be given a control timing in which the rise and fall of the voltage of the data electrode 2 are always shifted.

(Third Embodiment) FIG. 5 shows a plasma display panel data driving apparatus (hereinafter referred to as PD) of the present invention.
FIG. 9 is a diagram illustrating a third embodiment of a P data driving device).

In the third embodiment, as shown in FIG. 5, a driving pulse A and a driving pulse B by a data driver 3 are applied to a data electrode 2 of a plasma display panel (hereinafter referred to as a PDP) 1 by, for example, 3 pulses. I give it every other book.

As described above, the drive pulse A and the drive pulse B by the data driver 3 are applied to, for example, the data electrodes 2 every three lines, as in the first embodiment. The change in the voltage becomes gentle due to the charging and discharging of the capacitance 4, and the generation of the disturbing electromagnetic wave at the data electrode 2 of the PDP 1 is suppressed.

In the third embodiment, a case has been described in which the drive pulse A and the drive pulse B are applied to the data electrodes 2, for example, every third electrode.
However, the present invention is not limited to this. For example, it is also possible to set every two or four lines.

However, as the number increases, the effect of reducing the change in the voltage of the data electrode 2 becomes weaker. Therefore, it is desirable that the number is as small as possible.

[0042]

As described above, according to the plasma display panel data driving apparatus and the driving method thereof according to the present invention, the data driver drives the data electrodes of the plasma display panel every other first and second data electrodes.
When the first or second drive pulse is applied, the timing of the rise and fall of the voltage of the data electrode by the second or first drive pulse is determined during the period in which the voltage of the data electrode is stable by the first or second drive pulse. In this case, the transient speed of the driving pulse is reduced by the interference due to the capacitance between the data electrodes, so that it is possible to suppress the generation of the interfering electromagnetic waves at the data electrodes of the plasma display panel.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of a plasma display panel data driving device of the present invention.

FIG. 2 is a diagram for explaining the operation of the plasma display panel data driving device of FIG. 1;

FIG. 3 is a diagram for explaining an operation of the plasma display panel data driving device of FIG. 1;

FIG. 4 is a view showing a second embodiment of the plasma display panel data driving device of the present invention.

FIG. 5 is a diagram showing a third embodiment of the plasma display panel data driving device of the present invention.

FIG. 6 is a diagram showing an example of a conventional plasma display panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plasma display panel 2 Data electrode 3 Data driver 4 Capacitance A, B drive pulse

Claims (6)

[Claims] 1. A plasma display panel having a plurality of data electrodes, and a data driver for applying first and second drive pulses to every other data electrode, wherein the data driver comprises: Due to the first or second drive pulse, during a period when the voltage of the data electrode is stable,
A data driving apparatus for a plasma display panel, wherein timing of rising and falling of the voltage of the data electrode by the second or first drive pulse is generated. 2. The data driving apparatus according to claim 1, wherein the data driver supplies the first and second driving pulses to the data electrodes every few lines. 3. The data driver according to claim 1, wherein the first drive pulse is a flat enable signal, and the second drive pulse is a signal giving a control timing at which the rise and fall of the voltage of the data electrode are shifted. The plasma display panel data driving device according to claim 1 or 2, wherein: 4. A first step in which first and second drive pulses are alternately applied to a plurality of data electrodes of a plasma display panel, and the first and second drive pulses cause the first and second drive pulses to generate the data electrodes. Generating a rise and fall timing of the voltage of the data electrode by the second or first drive pulse during a period when the voltage is stable. Drive method. 5. The method according to claim 4, wherein the first step includes a third step of applying the first and second drive pulses to the data electrodes every few lines. The driving method of the plasma display panel described in the above. 6. The second or third step, wherein the first drive pulse is a flat enable signal, and the second drive pulse is a rise and a fall of the voltage of the data electrode. 6. The method according to claim 4, further comprising the step of: providing a signal to which a control timing at which the falling edge is shifted is provided.