JPH11219150A - Driving method of AC type plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continue discharge while generating self-discharge so as to increase light emission frequency to the applied pulse number by storing charge ionized by first discharge generated by the rise of voltage, onto a dielectric layer, generating second discharge in the case of stopping current application, and applying voltage to the other electrode before generated space charge is neutralized and eliminated, to discharge. SOLUTION: When first sustained pulse 58 is applied to a Y-electrode, effective voltage obtained by adding discharge maintaining voltage V1 to potential difference of charge stored in a dielectric is generated between X-, Y-electrodes, and when the effective voltage becomes discharge start voltage V2 or more, discharge is generated. Charge generating space by discharge during a current flowing period t1 is drawn onto the dielectric to store charge. In a current stop period t2, the effective voltage becomes discharge start voltage V2 or more, so that self-discharge is generated, and stored charge is extinct, but when voltage is applied in the state of charge remaining in space, discharge can be performed even when the effective voltage is the discharge start voltage V2 or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a driving method for a plasma display panel (hereinafter referred to as PDP) device.

[0002]

2. Description of the Related Art In driving a PDP, Japanese Patent Application Laid-Open No. 8-31
As disclosed in Japanese Patent No. 4405, if self-discharge is performed using charges accumulated on a dielectric, the number of times of light emission can be doubled with the same number of pulses. However, when the cell is small and the electrodes are narrow, most of the charge accumulated on the dielectric by self-discharge is erased, and it is difficult to leave enough charge on the dielectric for the next discharge. Therefore, it has been difficult to maintain discharge while causing self-discharge.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide means capable of continuing discharge while causing self-discharge and increasing the number of times of light emission with respect to the number of applied pulses.

[0004]

According to the present invention, in order to solve the above-mentioned problem, the interval between pulses for continuously generating a discharge is set to 0.3 μs.
The discharge is continued by the charge remaining in the space within the time of 1 μs or less.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 2 is an exploded perspective view showing a part of the structure of a PDP to which the present invention is applied. A transparent common electrode (hereinafter referred to as an X electrode) 22 and a transparent independent electrode 22 are provided on the lower surface of a front glass substrate 21. An electrode (hereinafter referred to as a Y electrode) 23 is provided. Further, an X bus electrode 24 and a Y bus electrode 25 are laminated on the X electrode 22 and the Y electrode 23, respectively. Further, the X electrode 22, the Y electrode 23, the X bus electrode 24, and the Y bus electrode 25 are covered with a dielectric 26, and a protective layer 27 such as MgO is provided.

On the other hand, on the upper surface of the rear glass substrate 28, X
An electrode (hereinafter referred to as an A electrode) 29 which three-dimensionally intersects the electrode 22 and the Y electrode 23 at a right angle is provided, and the A electrode 29 is
0, and a partition 31 is provided on the dielectric 30 in parallel with the A electrode 29. Further, the A electrode 2 in a concave region formed by the wall surface of the partition wall 31 and the upper surface of the dielectric 30 is formed.
The phosphor 32 is applied to the inside of the portion sandwiching 9.

FIG. 3 is a plan view of P seen from the direction of arrow D1 in FIG.
FIG. 3 is a cross-sectional view of the DP, showing one cell which is a minimum unit of a pixel.

As shown in FIG. 3, the A electrode 29 is located between the two partition walls 31 and is located between the front glass substrate 21 and the rear glass substrate 2.
8. The discharge space 33 surrounded by the partition walls 31 is filled with a gas for causing discharge.

FIG. 4 shows P as viewed from the direction of arrow D2 in FIG.
FIG. 3 is a cross-sectional view of the DP, showing one cell. The boundaries of the cells are roughly indicated by dotted lines, but are not actually separated by partitions or the like.

FIG. 5A is a diagram showing an operation in a field period required to display one image on the PDP shown in FIG. One field period 40 is divided into a plurality of subfields 41 to 48, and each subfield includes a preliminary discharge period 49, a write discharge period 50 defining a light emitting cell, and a light emitting display period 51 as shown in FIG.

FIG. 6 shows a voltage waveform applied to each electrode in one subfield. A waveform 52 is a voltage waveform applied to the X electrode, 53 is a voltage waveform applied to one Y electrode, and 54 is a voltage waveform applied to one address electrode 29. In the preliminary discharge period 49, a reset pulse 57 is applied to the X electrode 22. In the writing period 50, Y
Write discharge is performed by a Y scan pulse 55 applied to the electrode 23 and an address pulse 56 applied to the address electrode 29. In the light emitting display period 51, the first sustain pulse 58 applied to the Y electrode 23 and the X sustain pulse 5
9, Y sustain pulse 60, overall address pulse 61
Consists of

In the pre-discharge period 49, the electric charge accumulated on the dielectric by the discharge by the reset pulse 57 applied to the X electrode 22 is erased. Thereafter, when the scan pulse 56 is applied to the Y electrode 23, the address electrode 29
When an address pulse 56 is applied to a cell, a write discharge occurs in a cell located at the intersection.

In the write discharge period 56, the X electrode 2
2, a positive voltage is applied to the Y electrode 23 and a negative voltage is applied to the Y electrode 23. Therefore, the X and Y electrodes collect charges generated by the write discharge, and the negative electrode is placed on the dielectric near the X electrode 22. charge,
Positive charges are accumulated on the dielectric near the Y electrode 23.
On the other hand, when the scan pulse 56 is applied to the Y electrode 23, if the address electrode 29 is at the ground potential, no write discharge occurs, and the cell becomes a non-light emitting cell.

FIG. 1 is a detailed view of a light emitting display period 51 showing a method of sustaining discharge according to the present invention. Reference numerals 52 and 53 denote voltage waveforms applied to the X electrode 22 and the Y electrode 23, respectively, where V1 is a current during which the discharge maintaining voltage V1 is applied, and t1 is a conduction period during which the discharge maintaining voltage V1 is applied. V2 is the discharge start voltage during the grounding stop period. Reference numeral 1 denotes light emission due to discharge.

When the first sustain pulse 58 in the light emitting display period 51 is applied to the Y electrode 23, the first sustain pulse 58 is formed by charges accumulated in the dielectric near the X electrode 22 and the dielectric near the Y electrode 23 during the writing discharge period 50. The effective voltage obtained by adding the potential difference (hereinafter referred to as the wall voltage) and the sustaining voltage V1 is X,
This occurs between the Y electrodes. And the effective voltage is the discharge starting voltage V
The discharge is generated by setting the discharge maintaining voltage V1 so as to be 2 or more.

After the discharge, the electric charge generated by the discharge during the energizing period t1 is attracted onto the dielectric to accumulate the electric charge. However, only the discharge by the first sustain pulse 58 is weak in the discharge and is difficult to collect the charge on the dielectric because the amount of charge accumulated on the dielectric during the writing discharge period 50 is not sufficient. Therefore, the energization period t
By increasing the length of one more charge is collected on the dielectric. When the energization period t1 ends and the energization suspension period t2 starts, the potentials of both the X electrode 22 and the Y electrode 23 become the ground potential. That is, the wall voltage formed during the energization period t1 becomes the effective voltage. Here, by setting the discharge sustaining voltage V1 to be high and the energizing period t1 to be long, the difference between the wall voltages between the X and Y electrodes during the energizing period t1 is equal to or higher than the discharge starting voltage V2. Then, when the power supply period is changed from the power supply period t1 to the power supply stop period t2, the self-discharge occurs because the effective voltage becomes equal to or higher than the discharge start voltage V2. I do.

In the state where the charges accumulated on the dielectric have disappeared, the discharge does not continue even if the voltage is applied because the effective voltage is equal to or lower than the discharge starting voltage V2. In contrast,
If a voltage is applied in a state where charges remain in the space, discharge can be performed even if the effective voltage is equal to or lower than the discharge starting voltage V2. After the discharge, the electric charge is accumulated on the dielectric so that the potential difference between X and Y becomes equal to or higher than the discharge starting voltage V2 during the energizing period t1 as before, and the self-discharge and the electric charge remaining in the space thereafter. It is possible to maintain the discharge by alternately repeating the discharge caused by the discharge. When the discharge is maintained by this method, the discharge using the space charge and the light emission due to the self-discharge are generated by one sustain pulse, so that the number of times of light emission during the light emitting display period 51 is twice the number of times of application of the sustain pulse, and the luminance is increased. Can be increased.

It should be noted that when the power supply suspension period t2 is 1 μs or less, discharge can be performed using the charge remaining in the space as a pilot light. Therefore, it is appropriate that the energization suspension period t2 is 1 μs or less, and 0.3 μs or more in consideration of the discharge delay of the self-discharge.

[0020]

According to the present invention, light emission is performed twice as many times as the number of applied pulses. Therefore, the brightness can be increased in the same discharge sustaining period.

[Brief description of the drawings]

FIG. 1 is a characteristic diagram illustrating a light emitting display period according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a part of the structure of the plasma display panel of the present invention.

FIG. 3 is a cross-sectional view of the plasma display panel viewed from the direction of arrow D1 in FIG.

FIG. 4 is a cross-sectional view of the plasma display panel viewed from the direction of arrow D2 in FIG.

FIG. 5 is a diagram showing an operation in one field period forming one image.

FIG. 6 is a characteristic diagram showing an operation of a driving voltage in one subfield.

[Explanation of symbols]

1: light emission by discharge, 21: front glass substrate, 22: X
Electrodes, 23: Y electrode, 24: X bus electrode, 25: Y bus electrode, 26: dielectric, 27: protective layer, 28: back glass substrate, 29: A electrode, 30: dielectric, 31: partition, 32
... fluorescent material, 33 ... discharge space, 40 ... 1 field, 41
To 48: subfield, 49: preliminary discharge period, 50
... write discharge period, 51 ... light emission display period, 52 ... voltage waveform applied to the X electrode, 53 ... voltage waveform applied to the Y electrode, 54 ... voltage waveform applied to the address electrode, 55 ... Y
Scan pulse, 56 ... address pulse, 57 ... reset pulse, 58 ... first sustain pulse, 59 ... X sustain pulse, 60 ... Y sustain pulse, 61 ... full address pulse.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Sasaki 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Home Appliances and Information Media Business Unit of Hitachi, Ltd. (72) Inventor Takahisa Mizuta Yoshida, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture No. 292, Hitachi, Ltd. Home Appliances & Information Media Business Division

Claims (2)

[Claims] A first electrode group disposed on a light-transmitting substrate, a second electrode group disposed in parallel with the first electrode group, and a dielectric layer covering the electrodes; In a method for driving an AC plasma display panel in which a voltage is alternately applied to the first electrode group and the second electrode group to continuously discharge, a voltage is applied to one of the electrode groups to The first discharge that occurs at the rise, the charge ionized by the first discharge is accumulated on the dielectric layer, and when the current is stopped, a second discharge is caused by the charge accumulated on the dielectric, and A is characterized in that a voltage is applied to the other electrode to discharge it before the charge in the space generated by the second discharge is neutralized and erased.
A method for driving a C-type plasma display panel. 2. The plasma display apparatus according to claim 1, wherein the interval between the voltages alternately applied to said first and second electrodes is 0.3 μs or more and 1 μm to continuously discharge.
s or less, a method for driving an AC plasma display panel.