JPH04291293A - Drive method for three-electrode type discharge plasma display panel - Google Patents

Abstract

PURPOSE:To avoid damage to an address electrode and to prolong the service life by extinguishing a wall voltage by setting electric charges on the insulated layer of an X electrode and on the insulated layer of a Y electrode to the same polarity. CONSTITUTION:An address electrode 4 is provided to discharge and erase picture elements unnecessitating maintaining discharging while being arranged orthogonally to the X electrode and the Y electrode to discharge and turn on the picture elements. Then, after the wall electric charges of respectively different polarities are accumulated on an MgO layer 13 of the X electrode and an MgO layer 13 of the Y electrode, concerning the picture elements unnecessitating maintaining discharging, the wall voltage is extinguished by inverting the polarity of the wall electric charge on the MgO layer 13 of the Y electrode and setting the wall electric charges on the MgO layers 13 of the X and Y electrodes to the same polarity while executing discharging between the address electrode 4 and the Y electrode. Therefore, erasing error can be eliminated, it is not necessary to accumulate excess wall electric charges and the damage for the address electrode 4 can be avoided.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for driving a three-electrode surface discharge plasma display panel.

0002

2. Description of the Related Art Conventionally, a three-electrode surface discharge plasma display panel has been proposed, the schematic plan view of which is shown in FIG. In the figure, 1 is the panel body, 2 and 3 are display electrodes made of transparent conductors (hereinafter, display electrode 2 is referred to as X electrode,
The display electrode 3 is called a Y electrode), 4 is an address electrode made of silver, and a pair of X electrode and Y electrode form a display line. In addition, 5 is an X electrode driver that drives the X electrode,
6 is a Y electrode driver that drives the Y electrode, and 7 is an address electrode driver that drives the address electrode 4.

FIG. 4 is an exploded perspective view showing the basic structure of the three-electrode surface discharge plasma display panel shown in FIG. 12 is a dielectric layer that covers the X electrode and Y electrode, 13 is an MgO layer that is a protective layer, 14 is a lattice-like rib that is a barrier for discharge separation, and 15 is a bus electrode for dealing with voltage drop due to resistance. A separator 16 provided between display lines is a phosphor.

FIG. 5 is a diagram for explaining a conventional driving method for such a three-electrode surface discharge plasma display panel.
In FIG. 5a, the diagonal lines drawn in the pulse portion indicate the application of the pulse to the address electrode arranged in the pixel in which discharge is to be erased or to the Y electrode of the selected display line. The same applies to FIGS. 1 and 2, which will be described later.

In the conventional driving method, first, a positive write voltage Vw is applied to the X electrode, and a negative voltage -Vs is applied to the Y electrode of the selected display line. The Y electrode of the display line is held at GND potential. In this case, the X electrode and Y electrode of the selected display line
The voltage applied between the electrodes is Vw+Vs, but here in advance, Vw+Vs>Vf (discharge starting voltage)>Vw,
By setting each voltage so that it becomes Vs,
Discharge occurs in all pixels (dots) only in the selected display line. In this case, in the selected display line,
Negative wall charge on the MgO layer 13 on the electrode, Mg on the Y electrode
A positive wall charge is accumulated on the O layer 13 (see FIG. 5b), and a wall voltage is generated in all pixels on the selected display line.
Since this wall voltage has a polarity that reduces the internal voltage of the discharge space, the discharge ends instantaneously, for example, in 0.1 to 1 μS.

[0006] Next, a discharge sustaining pulse of voltage -Vs is applied alternately to the X electrode and the Y electrode, and a discharge is performed using the memory effect. Here, for pixels whose discharge is to be erased, a discharge sustaining pulse is applied for 1 to 2 cycles, and the wall charge on the MgO layer 13 on the X electrode of the selected line is positive, and the wall charge on the MgO layer 13 on the Y electrode is positive. After the wall charge becomes negative (see FIG. 5c), a positive address voltage (erasing pulse) Va is applied to the address electrode of the pixel whose discharge is to be erased, and a voltage of - Vs
is applied. Then, a sustaining discharge occurs in all the pixels of the selected display line, but especially when the voltage V is applied to the address electrode.
In the pixel to which a is applied, discharge occurs between the address electrode and the Y electrode, and excessive wall charges are accumulated on the MgO layer 13 on the Y electrode (see FIG. 5d). In this case, if the voltage Va is set to a value such that the wall voltage itself exceeds the discharge starting voltage, a self-erasing discharge will occur after the external voltage is removed (when both the X and Y electrodes are at GND potential). As a result, the wall charge of this pixel disappears, and the display is erased (see FIG. 5e).

[0007]

[Problems to be Solved by the Invention] However, self-erasing discharge first occurs near the X electrode and Y electrode of the target pixel, and gradually moves outward and expands.
At this time, there is a problem in that in a pixel with a high discharge starting voltage, the accumulated wall charge is relatively insufficient, and a sufficient self-erasing discharge is not performed, resulting in an erasing error.

Further, self-erasing discharge requires excessive accumulation of charge, but there is a problem in that during self-erasing discharge, excess charge collides with address electrode 4, causing damage to address electrode 4.

[0009] In view of these points, the present invention has made it possible to prevent erasing errors and perform good image display, and also to avoid damage to the address electrodes and extend the service life. An object of the present invention is to provide a method for driving a three-electrode surface discharge plasma display panel.

0010

[Means for Solving the Problems] A method for driving a three-electrode surface discharge plasma display panel according to the present invention includes an X electrode (first electrode) and a Y electrode that are arranged along a display line and perform discharge lighting of pixels. (second electrode), these X electrodes and Y
An address electrode (third electrode) is arranged perpendicular to the electrode and performs discharge erasing of the pixel without the need for sustaining discharge,
In a three-electrode surface discharge plasma display panel in which the X electrodes are commonly connected and the Y electrodes are independently provided for each display line, the insulating layer on the X electrode and the insulating layer on the Y electrode are provided. After accumulating wall charges of different polarities,
For pixels that do not require sustaining discharge, the polarity of the wall charge on the insulating layer on the Y electrode is reversed by the discharge between the address electrode and the Y electrode, and the insulating layer on the insulating layer on the X electrode and on the Y electrode is reversed. The idea is to make the wall charges on the layers the same polarity and eliminate the wall voltage.

[0011]

[Operation] In the present invention, on the insulating layer on the X electrode and on the Y
Since the charges on the insulating layer on the electrode are made to have the same polarity to eliminate the wall voltage, the wall voltage can be surely eliminated, and there is no need to accumulate excessive wall charges.

0012

[Embodiment] First, referring to FIG. 1, an example will be given of an embodiment of the present invention in which a three-electrode surface discharge plasma display panel shown in FIGS. 3 and 4 is driven in the same manner as the conventional example. I will explain.

FIG. 1 is a diagram for explaining one embodiment of the present invention. In this embodiment, first, as in the case shown in FIG. 5, a positive write voltage Vw is applied to the X electrode, and , a negative voltage -Vs is applied to the Y electrode of the selected display line, and the display electrode Y of the unselected display line is G
Hold at ND potential. In this way, the MgO layer 13 on the X electrode and the MgO layer 13 on the Y electrode of the selected display line are
Negative and positive charges are accumulated on the gO layer 13, respectively (see FIG. 1b). Therefore, next, the voltage -Vs
A discharge sustaining pulse of 1 cycle is applied alternately to the X electrode and the Y electrode, and a discharge is performed using the memory effect.

Next, a voltage -Vs is applied to the X electrode while keeping the voltage of all Y electrodes at GND potential, and the MgO layer 13 on the X electrode and the MgO layer 13 on the Y electrode of the selected display line are
The wall charges on the gO layer 13 are made positive and negative, respectively (Fig. 1c
After that, while keeping the voltage of the X electrode at -Vs, a positive address voltage Vh (<Va (see Figure 5)) is applied to the address electrode of the pixel whose discharge is to be erased among the pixels of the selected display line. At the same time, a voltage -Vs is applied to the Y electrode of the selected display line. In this way, a discharge is generated between the address electrode and the Y electrode only in the pixel where the discharge should be erased, and the negative wall charge on the 13th MgO layer on the Y electrode of the selected display line is removed from the address electrode. leaks into electrode 4,
Instead, positive wall charges accumulate. At this point, the wall charges of the pixels that should erase the discharge all become positive, the wall voltage disappears, the memory effect disappears, and the discharge disappears (disappearance of the display).
will be held. It should be noted that addressing for one screen can be completed by sequentially performing the address operation based on all lights on each display line and selective charge polarity reversal for all display lines.

Note that the voltage to be applied to the address electrode, X
The voltage to be applied to the electrode and the voltage to be applied to the Y electrode are:
It may be as shown in FIG. 2a. In addition, Figure 2b
corresponds to FIG. 1b, FIG. 2c corresponds to FIG. 1c, and FIG. 2d corresponds to FIG. 1d.

[0016]

According to the present invention, the wall charges on the insulating layer on the X electrode and on the insulating layer on the Y electrode are made to have the same polarity so that the wall voltage disappears. Since this can be done reliably, erasing errors can be eliminated, and there is no need to accumulate excessive wall charges as in the conventional example, so damage to the address electrodes can be avoided and the service life can be extended.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining an embodiment of a method for driving a three-electrode surface discharge plasma display panel according to the present invention.

FIG. 2 is a diagram showing another embodiment of the present invention.

FIG. 3 is a schematic plan view of a conventional three-electrode surface discharge plasma display panel.

FIG. 4 is an exploded perspective view showing the basic structure of a conventional three-electrode surface discharge plasma display panel.

FIG. 5 is a diagram for explaining a method of driving a conventional three-electrode surface discharge plasma display panel.

[Explanation of symbols]

4 Address electrode 8, 9 Glass substrate 12 Dielectric layer 13 MgO layer

Claims (1)

[Claims] 1. First and second electrodes arranged along a display line and for lighting a pixel by discharge;
and a third electrode disposed perpendicularly to the first electrode for erasing the discharge of the pixel making a sustaining discharge unnecessary;
In a three-electrode surface discharge plasma display panel in which the electrodes are commonly connected and the second electrode is provided independently for each display line, After wall charges of different polarities are accumulated on the insulating layers on the electrodes, for pixels that do not require a sustaining discharge, the discharge between the third electrode and the second electrode causes the second Reversing the polarity of the wall charges on the insulating layer on the electrode, making the wall charges on the insulating layer on the first electrode and the insulating layer on the second electrode the same polarity, and extinguishing the wall voltage. A method for driving a three-electrode surface discharge plasma display panel.