JPH0764507A - Driving method for gas discharge panel - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a method of driving a gas discharge panel, in which the margin of the display discharge voltage is increased and three types of electrodes are sufficient, so that the panel structure can be simplified. According to the present invention, a front substrate is provided with a plurality of strip-shaped electrodes arranged in parallel and an anode branched from the electrodes via a resistance wire for each cell, and the strip-shaped electrodes and the resistors are further provided. An insulating layer is provided to at least hide the filaments, and a strip-shaped cathode and a strip-shaped auxiliary electrode are provided on the rear substrate either directly or through the insulating layer so as to be three-dimensionally orthogonal to the electrodes, and the auxiliary electrode is at least a dielectric layer. A method of driving a gas discharge panel or the like, which is covered with, and is provided with partition walls for separating each cell,
Auxiliary electrodes are line-sequentially scanned, trigger setting is performed between selected anodes, and after one round of scanning, positive pulses are applied to all anodes and negative pulses are applied to all cathodes to all auxiliary electrodes. It is characterized in that the positive pulses are applied almost simultaneously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC type gas discharge panel and a driving method for displaying characters, figures and the like by utilizing light emission of gas discharge, and more particularly to a driving method for a gas discharge panel having a memory function. Is about

[0002]

2. Description of the Related Art In recent years, a gas discharge panel can be made thin, and since it is a flat type, there is no display distortion in the corners and the like, eyes are less tired because there is no flicker, and harmful electromagnetic waves such as X-rays are emitted. Since it has no characteristics and has a wide operating temperature range, it has been noticed and partially put into practical use.However, since the brightness is relatively low, it has recently become necessary to increase the brightness especially in the case of color display. A DC type gas discharge panel having a memory function is, for example, an NHK 33 type PPM panel or the M.P. panel described in JAPAN DISPLAY '92, pages 617 to 620. S16-5 by SEKI etc.
An 8-in. PulseMemory Colo
r DC-PDP without Auxiliary
y Cell FIG. It is proposed as the panel shown in FIG.

However, in any gas discharge panel,
A write pulse for causing discharge according to the data of the display image and a sustain pulse for maintaining the started pulse discharge are periodically applied to the display anode, and auxiliary discharge such as pilot discharge and trigger discharge is applied to the cathode. The scan pulse for performing the operation and the erase pulse for controlling the sustain emission period are line-sequentially applied, and if the sustain pulse voltage (display discharge voltage) and the erase pulse voltage that are the main components of the display discharge are appropriately selected, the In the cell, the charged particles generated by the seed discharge or the trigger discharge are used as priming to generate the writing discharge in the display cell by the writing pulse on the anode side and the scanning pulse on the cathode side, and after the writing discharge is finished, the charged particles are primed to the anode side. Sustain discharge is performed by the sustain pulse of, but when the voltage of the sustain pulse is increased in the non-lighted cell, Even though there are no residual charged particles due to the impact discharge, there is a risk of erroneous discharge due to priming due to residual charged particles in the auxiliary discharge or bleeding of charged particles in adjacent cells. Can not. Then, there is a possibility that the sustain discharge cannot be performed in the cell in which the write discharge has been performed (selected cell).
That is, there is a drawback that the voltage margin of the sustain pulse (the voltage range in which stable memory operation is possible) is small.

Further, the control circuit is complicated, for example, the voltage applied to the cathode is set to three stages in order to expand the voltage margin, and two kinds of pulses, that is, a write pulse and a sustain pulse, are applied to the display anode, so that they are separately provided. Therefore, the control circuit was inevitably complicated.

Moreover, since both the writing discharge and the sustaining discharge utilize glow discharge, there are drawbacks such as low luminous efficiency. In order to solve such a defect, the present applicant applied for Japanese Patent Application No. 5-159616, Japanese Patent Application No. 5-183047, Japanese Patent Application No. 5-186242 and Japanese Patent Application No. 5-190390. .

These panels are excellent in that the voltage margin of the sustain pulse is increased and the brightness is improved. However, in addition to the cathode and the anode, two types of auxiliary electrodes, an auxiliary electrode and a sustain electrode or an auxiliary electrode are used. It was unavoidable that a pilot fire anode was required and a total of four types of electrodes were required.

The present invention has been made in view of the above point, and increases the margin of the display discharge voltage and
An object of the present invention is to provide a method of driving a gas discharge panel, which can simplify the panel structure because it requires only three types of electrodes.

[0008]

A method of driving a gas discharge panel according to the present invention comprises a plurality of strip-shaped electrodes arranged in parallel on a front substrate and a resistance strip for each cell from the electrodes. A branched anode is provided, and an insulating layer that at least hides the strip-shaped electrode and the resistance wire is provided, and a strip-shaped cathode and a strip-shaped auxiliary electrode are formed on the rear substrate either directly or through the insulating layer and the electrode is three-dimensional. A plurality of strip-shaped auxiliary electrodes are provided in parallel with each other on the gas discharge panel or the front substrate in which the auxiliary electrodes are covered with at least a dielectric layer and partition walls for separating each cell are provided. At least a dielectric layer is provided on the above, and further, at least through this dielectric layer or directly on the front substrate, a strip-shaped cathode is provided in parallel with the auxiliary electrode, and a partition wall for separating each cell is provided, The surface substrate is provided with a plurality of strip-shaped electrodes arranged in parallel directly or via a reflection layer and an anode branched from the electrodes via a resistance wire for each cell, and further with the strip-shaped electrodes. A method of driving a gas discharge panel provided with at least an insulating layer that at least hides a resistance wire, wherein auxiliary electrodes are line-sequentially scanned, trigger setting is performed with a selected anode, and after the scanning has completed one cycle. ,
It is characterized in that a positive pulse is applied to all anodes, a negative pulse is applied to all cathodes, and a positive pulse is applied to all auxiliary electrodes at substantially the same time, and the auxiliary electrodes are line-sequentially scanned. However, it is more preferable to perform positive discharge by applying positive pulses to all auxiliary electrodes and negative pulses to all cathodes before performing trigger setting with the selected anode.

[0009]

[Function] Conventionally, the cathode is line-sequentially scanned and the writing discharge is performed between the selected anode and the selected anode. Before that, in order to have a priming effect, auxiliary setting such as trigger setting and pilot discharge is performed by another electrode. Since it was necessary to discharge all the cells and had a priming effect on all cells, there was a risk of erroneous discharge, and the sustain voltage margin could not be increased, but the panel of the present invention was not a cathode. It scans the auxiliary electrodes line-sequentially, discharges them with the selected anode, and sets the trigger.When the scanning has completed, positive pulses are applied to all anodes and negative pulses are applied to all cathodes. By applying positive pulses to the auxiliary electrodes of the cells at approximately the same time, discharge is generated between the cathode of the selected cell and the auxiliary electrodes, trigger discharge is performed, and the cells are selected at approximately the same time. Writes discharge between the anode and the cathode, only the selected cell is displayed. On the other hand, unselected cells have no priming effect, so
Even if a voltage is applied between the anode and the auxiliary electrode and between the anode and the cathode, no discharge occurs and no display occurs.
That is, in the panel of the present invention, only the selected cells are primed, the possibility of erroneous discharge is low, the sustain voltage margin can be increased, and the trigger setting is performed by line-sequential scanning of the auxiliary electrodes. 3
It can be done by type, the structure is simple, and the cell can be miniaturized.

Further, when a positive pulse is applied to all the auxiliary electrodes and a negative pulse is applied to all the cathodes prior to the trigger setting, a negative wall charge is generated in the dielectric layer on the auxiliary electrodes. It is possible to reduce the applied voltage between the cathode and the anode when the trigger is set. Even if positive or negative wall charges are attached to the dielectric layer on the auxiliary electrode by performing the display discharge, the negative charges are applied to the cathode during the preliminary discharge, so that the positive charges are applied to the cathode side. Since the non-selected cells are attracted and discharged to disappear, the unselected cells are not primed, and the possibility of erroneous discharge can be further reduced.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. 1, FIG. 2 and FIG. 3 are respectively a partially cutaway perspective view of a gas discharge panel in Example 1 of the present invention, a partial sectional view taken along a line passing through the center of an anode and parallel to an electrode, and a time chart showing a driving method. Is.

FIG. 4 and FIG. 5 are a partially cutaway perspective view of a gas discharge panel according to the second embodiment and a partial sectional view taken along a line passing through the center of the anode and orthogonal to the auxiliary electrode. Example 1 As shown in claim 1, a gas discharge panel in which light is emitted by the phosphor on the front substrate side and the phosphor on the rear substrate side will be exemplified.

As shown in FIGS. 1 and 2, a transparent conductive film such as ITO or SnO ₂ is formed as a plurality of strip-shaped electrodes 2 arranged in parallel on a front substrate 1 made of glass or the like by a sputtering method, a vacuum deposition method or the like. And the anode 4 branched from the electrode via the resistance wire 3 for each cell is screen-printed with a silver paste, a paste containing ruthenium oxide as a main component, and a paste containing nickel as a main component. Formed by firing.

Next, a light-transmissive insulating layer 5 that at least hides the strip-shaped electrodes and the resistance wire is formed by screen printing and baking with a glass paste, and a red light-transmissive insulating layer 6 is formed thereon. A screen containing a phosphor that emits color as a main component, a paste that contains a phosphor that emits green as a main component, and a paste that contains a phosphor that emits blue as a main component are screen-printed and baked for each cell. To form phosphor layers P _R , P _G , and P _B , respectively.

On the other hand, an insulating layer 8 is formed on the entire surface of the rear substrate 7 by screen-printing and baking a glass paste, and n strip-shaped cathodes 9 which are three-dimensionally orthogonal to the electrodes 2 are formed with nickel. A band-shaped auxiliary electrode 10 from T ₁ to T _n is formed by screen-printing and firing with a silver paste, respectively, by a paste as a main component, and a glass paste is screen-printed and fired on the auxiliary electrode. A dielectric layer 11 is formed, and on the insulating layer 8 and the insulating layer 8, a paste containing a phosphor that emits red as a main component, a paste containing a phosphor that emits green as a main component, and a blue A paste containing a phosphor that emits light as a main component is screen-printed for each cell and baked to form phosphor layers P _R , P _G , and P _B.

Next, a partition wall 13 for separating each cell
Is formed by screen printing and baking a glass paste a number of times. Thereafter, the front substrate and the rear substrate are overlapped and sealed, and a gas having a predetermined gas pressure such as He and Xe is filled in the space portion 14.
Is sealed so as to have a pressure of 250 Torr to complete the gas discharge panel 15.

The gas discharge panel 1 thus obtained
5 is driven as shown in the time chart of FIG. That is, in STEP1, the potentials of all auxiliary electrodes are V _T1.
And a negative pulse having a potential of −V _K1 are applied to all the cathodes to perform preliminary discharge between the cathode and the auxiliary electrode in all cells. In this state, negative wall charges are formed on the dielectric layer on the auxiliary electrode, the discharge voltage of the trigger setting in STEP 2 is lowered, and further, the effect after discharge of the selected cell is reduced, and the function of preventing erroneous discharge is achieved. There is.

Next, in STEP 2, T ₁ to T _n
Until applying a negative pulse to sequentially potential line is -V _T2, applying a positive pulse voltage is V _A2 to the selected anode, to cause a discharge between them, performing a trigger setting. In this state, positive wall charges are formed on the dielectric layer on the auxiliary electrode.

When the scanning of the auxiliary electrodes has completed one cycle, in STEP 3, a positive pulse having a potential V _A3 is applied to all the anodes, and a negative pulse having a potential V _K3 is applied to all the cathodes, and the potentials V _T3 are applied to all the auxiliary electrodes. When positive pulses are applied almost at the same time, first, trigger discharge occurs due to the positive wall charges formed in the dielectric layer by the trigger setting of STEP 2 between the auxiliary electrode and the cathode of the selected cell, and then at about the same time. A main discharge (display discharge) occurs according to the pulse width applied between the generated anode and cathode, and display is performed during that period.

Thus, one frame (16.7 m)
s) is over, and the same procedure is followed. Further, grayscale display can also be performed by configuring one frame into a plurality of subframes, configuring each subframe as described above, and weighting the length of the sustain period binary.

Example 2 As shown in claim 2, a gas discharge panel which emits light by a phosphor provided on the front substrate side will be exemplified.

As shown in FIGS. 4 and 5, this gas discharge panel is used.
Is T on the front substrate 1 such as glass. ₁To T_nUp to
-Shaped auxiliary electrodes 10 are screened with silver paste.
Printed and fired to form the auxiliary electrode and the front substrate.
Screen printing a glass paste as the dielectric layer 11,
A magnesium oxide (MgO) layer is formed on the protective layer 16
For example, it is formed by the vacuum evaporation method, and further
The n-shaped strip-shaped cathodes 9 are nickel-based
Screen-printed and fired to form
A large number of glass pastes are provided for the partition walls 13 that separate the cells.
Formed by screen printing and firing.

On the other hand, on the rear substrate 7 made of glass or the like, a paste containing lead glass as a main component is screen-printed and baked to form a white reflective layer 17, and then a plurality of strip-shaped electrodes are arranged in parallel. 2 and the anode 4 branched from the electrode via the resistance wire 3 for each cell by screen printing and firing with a silver paste, a paste containing ruthenium oxide as a main component, and a paste containing nickel as a main component. To form.

Next, a white insulating layer 5 for concealing at least the strip electrodes and the resistance strips is formed by screen printing and firing with a paste containing lead glass as a main component, and a translucent insulating layer 6 is further formed thereon. As a paste containing a phosphor that emits red as a main component, a paste that contains a phosphor that emits green as a main component, and a paste that contains a phosphor that emits blue as a main component are divided into cells for each screen. Printing and firing are performed to form phosphor layers P _R , P _G , and P _B , respectively.

Thereafter, the front substrate and the rear substrate are overlapped and sealed, and a gas having a predetermined gas pressure, such as He and Xe, is sealed in the space portion 14 at a pressure of 250 Torr to complete the gas discharge panel 15.

In the gas discharge panel thus obtained, the fluorescent light is efficiently reflected to the front substrate side by the reflective layer 17, and
Since magnesium oxide having a high secondary electron emission coefficient is used as the protective layer, it has the function of reducing the discharge voltage at the time of trigger setting, and the driving method may be the same as that of the first embodiment.

Although the preferred embodiments have been described above, the present invention is not limited to these, and various applications are possible. Although a multicolor display panel has been described in the embodiment, it is of course applicable to a panel for monochromatic color display or a monochrome display without using a phosphor, and in the case of monochromatic color display, the phosphors of the insulating layers 6 and 12 are used. Need not be divided, and may be formed so as to be continuous. Further, in the case of such a color display, further providing a phosphor also on the inner surface side of the partition wall or the like improves the brightness.

In the case of monochrome display, the translucent insulating layer 6,
The insulating layer 12 becomes unnecessary. In this case, it is preferable to form the reflective layer 17 and the insulating layer 5 in black with a black lead glass paste because the contrast is improved.

Although the cathode is provided on the front substrate via the dielectric layer 11 and the protective layer 16 in the second embodiment, it may be directly provided on the front substrate. A hollow cathode having holes may be used, and in addition to nickel, a metal conductor such as aluminum or an oxide conductor having a perovskite structure may be used.

Regarding the branch from the electrode to the anode in the first embodiment, all the branched portions are formed by the resistance wire in the embodiment, but a low resistance conductive material made of the same material as the bus electrode is formed in the middle of the branched portion. You may make it branched by a wire and connect a resistance wire to this.

Regarding the insulating layer 8 provided on the rear substrate,
This is preferable because the cathode, auxiliary electrode, etc. formed thereon can be formed accurately without bleeding, but the insulating layer may be omitted and the cathode, auxiliary electrode, etc. may be formed directly.

Regarding the structure of the gas discharge panel, in each of the examples, the anode and the cathode were arranged on the opposite side of the cell to perform positive column discharge, which is preferable from the viewpoint of improving the luminous efficiency, but the anode and the cathode are preferable. May be arranged so as to face each other to perform glow discharge.

Regarding the driving method, the preliminary discharge in STEP 1 does not necessarily have to be performed, but it is preferable to perform it because the influence of the display discharge can be reduced and the discharge voltage of the trigger setting can be reduced. Further, in STEP 3, it is preferable that the pulse applied to the anode and the cathode is a single wide pulse as in the embodiment because the brightness is improved. However, a pulse having a short width may be periodically applied for display.

Regarding the protective layer, the magnesium oxide layer is preferably provided because it prevents the dielectric layer from deteriorating due to repeated discharges and increases the secondary electron emission coefficient, but it also has a drawback of absorbing ultraviolet rays. Depending on the structure, it may be preferable not to provide it as in the first embodiment.

[0035]

According to the gas discharge panel of the present invention, there is no risk of erroneous discharge, the margin of the display discharge voltage can be increased, and since only three types of electrodes are required, the panel structure can be simplified, so that the drive circuit is also provided. It is simplified and the cell itself can be downsized.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a gas discharge panel according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view taken along a line passing through the center of the anode of the gas discharge panel and parallel to the electrode in Example 1 of the present invention.

FIG. 3 is a time chart showing a driving method of the gas discharge panel according to the first embodiment of the present invention.

FIG. 4 is a partially cutaway perspective view of a gas discharge panel according to a second embodiment of the present invention.

FIG. 5 is a partial cross-sectional view taken along a line passing through the center of the anode of the gas discharge panel in Example 2 of the present invention and orthogonal to the auxiliary electrode.

[Explanation of symbols]

 1 Front Substrate 2 Electrode 3 Resistance Wire 4 Anode 5, 6, 8, 12 Insulating Layer 7 Back Substrate 9 Cathode 10 Auxiliary Electrode 11 Dielectric Layer 13 Partition 14 Space 15 Gas Discharge Panel 16 Protective Layer 17 Reflective Layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Kiyokawa 1510 Oguchi-cho, Matsusaka City, Mie Prefecture Central Glass Co., Ltd. Glass Research Institute

Claims (3)

[Claims] 1. A front substrate is provided with a plurality of strip electrodes arranged in parallel and an anode branched from the electrodes via a resistance wire for each cell, and further, the strip electrodes and the resistance wire are provided. An insulating layer is provided to at least cover the electrode, and a strip-shaped cathode and a strip-shaped auxiliary electrode are provided on the back substrate either directly or through the insulating layer so as to be three-dimensionally orthogonal to the electrodes, and the auxiliary electrode is covered with at least a dielectric layer. Then, in a method of driving a gas discharge panel provided with a partition for separating each cell, the auxiliary electrode is line-sequentially scanned, trigger setting is performed with the selected anode, and after the scanning has completed one cycle, A method of driving a gas discharge panel, wherein a positive pulse is applied to all the anodes, a negative pulse is applied to all the cathodes, and a positive pulse is applied to all the auxiliary electrodes at substantially the same time. 2. A front substrate is provided with a plurality of strip-shaped auxiliary electrodes in parallel, and at least a dielectric layer is provided on the auxiliary electrodes,
Further, at least through this dielectric layer or directly on the front substrate, a strip-shaped cathode is provided in parallel with the auxiliary electrode,
A partition wall for separating each cell is provided, and a plurality of strip-shaped electrodes arranged in parallel to the back substrate are provided directly or via a reflective layer, and each electrode is branched via a resistance wire for each cell. A method of driving a gas discharge panel, comprising an anode, further comprising at least an insulating layer for hiding at least the strip-shaped electrode and the resistance wire, wherein auxiliary electrodes are line-sequentially scanned, and a selected anode is connected to the anode. It is characterized in that the trigger setting is performed, and after one round of scanning, a positive pulse is applied to all the anodes, a negative pulse is applied to all the cathodes, and a positive pulse is applied to all the auxiliary electrodes at substantially the same time. Driving method for gas discharge panel. 3. A positive pulse is applied to all the auxiliary electrodes and a negative pulse is applied to all the cathodes before scanning the auxiliary electrodes line-sequentially and performing trigger setting with the selected anode. The method for driving a gas discharge panel according to claim 1 or 2, wherein the preliminary discharge is performed by the above method.