JPH0785193B2 - Plasma display panel and driving method thereof - Google Patents

Description

The present invention relates to a method for driving a plasma display panel.

(Prior Art) A plasma display panel is a display device that utilizes discharge light emission of a gas sealed inside, and therefore an initial discharge delay at power-on is a problem in any type of plasma display panel. Has become. As a means for avoiding such an initial discharge delay, conventionally, a method of inserting a radioisotope inside the panel, a method of disposing a keep-alive electrode for constantly maintaining discharge in the vicinity of the display area, and the like have been adopted. Especially in the refresh type AC plasma display panel, the conventional method of introducing a radioisotope, which is a pollutant, is avoided, and it is assisted on the other substrate so as to face the scanning electrode provided on one substrate. There is a method in which an electrode is provided and a pulse voltage having the same phase as the pulse voltage applied to the data electrode provided on the same substrate is always applied to the auxiliary electrode.

According to this conventional method for driving a plasma display panel, the auxiliary cells formed by the scanning electrodes and the auxiliary electrodes are always in the selected state for each corresponding scan, and these auxiliary cells are photon-coupled and Since the auxiliary cells are continuously formed to facilitate charge coupling, when any one of the auxiliary cells starts discharging, the other auxiliary cells are continuously in the discharging state. Therefore, such an auxiliary cell group can start discharging in a very short time after power-on, and the auxiliary cell in the discharged state supplies photons or charges to the display cell group, so that the display cell is discharged. It is possible to improve the delay.

(Problems to be Solved by the Invention) Recently, however, the conventional plasma display panel driving method described above is not sufficiently effective due to a decrease in the driving voltage of the panel, and the panel size is restricted. There has been a problem that the auxiliary electrode in the above-described conventional plasma display panel driving method may not be provided.

The present invention provides a method for driving a plasma display panel, which can solve the above-mentioned problems and can further improve the initial discharge delay characteristic very easily.

(Means for Solving the Problems) The present invention is directed to a first and a second substrate in which a gas is sealed, and a plurality of substrates provided in parallel to each other on the inner surface of the first substrate and covered with a dielectric film. A first electrode and a plurality of second electrodes provided on the inner surface of the second substrate in parallel to each other in a direction intersecting with the first electrode and covered with a dielectric film,
Each of the electrodes forming one of the plurality of first electrodes or the plurality of second electrodes is sequentially scanned to apply a scanning voltage to them, and is selected when the scanning voltage is applied to each of the electrodes forming the other. In the method of driving the plasma display panel, the voltage for data is applied, the first
A voltage waveform having the same phase as the voltage waveform applied to the first electrode on the first auxiliary electrode provided on the substrate and covered with the dielectric film in the blank period provided at least during the application of the scanning voltage. A voltage waveform applied to the second electrode, which is applied to the second auxiliary electrode which is provided on the second substrate and at least partly faces the first auxiliary electrode and is covered with a dielectric film. The in-phase voltage waveform is applied only during the blank period.

The plasma display panel of the present invention includes first and second substrates with a gas sealed between them, and a first electrode and a first electrode provided on the inner surface of the first substrate and covered with a dielectric film.
And an auxiliary electrode provided on the inner surface of the second substrate and covered with a dielectric film, and a second auxiliary electrode, the dielectric film covering the first and second electrodes. The number of layers of the dielectric film covering the first and second auxiliary electrodes or the first or second auxiliary electrode in a portion where the first and second auxiliary electrodes face each other is larger than the number of layers. It is characterized by a large number of people.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is an electrode configuration diagram of an XY dot matrix type plasma display panel used in the first embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA ′ shown in FIG. In FIG. 1, the electrode 4 is an X electrode composed of electrodes X1 to X9,
The electrode 6 is a Y electrode composed of the electrodes Y1 to Y5. The electrodes 4 and 6 are arranged so as to be orthogonal to each other.
The intersection of the electrode 6 and the electrode 6 forms a display cell. The electrodes for scanning of the plasma display panel shown in FIG. 1 are, for example, the electrodes 6, that is, the electrodes Y1 to Y5, and the auxiliary electrode 3 composed of the electrodes AX1 and AX2 is arranged in the same manner as in the conventional plasma display panel driving method. 3 is a data electrode 4
The selection voltage panel having the same phase as the voltage applied to the panel is always applied. Therefore, the auxiliary cell formed by the scanning electrode 6 and the auxiliary electrode 3 is always in the selected state for each corresponding scan, and conventionally, only the auxiliary cell has been used as a means for improving the discharge delay.

However, recently, with the decrease in the driving voltage of the panel, the effect is insufficient with only the auxiliary cell formed by the scanning electrode 6 and the auxiliary electrode 3. In order to solve such a problem, the present invention newly adds an auxiliary cell. An electrode 5 is provided. A method of driving the auxiliary electrode 5 will be described later, and first, FIG. 2 which is a cross-sectional view of the plasma display panel used in the present invention will be described. In FIG. 2, a display electrode 4 covered with a dielectric film 7 on the inner surface of the front glass substrate 1.
Are formed in parallel with each other, and the auxiliary electrodes 3 covered with the dielectric film 7 and the dielectric film 8 are formed at both ends in the arrangement direction of the electrodes 4. On the other hand, although not shown in FIG. 2, a display electrode 6 covered with a dielectric film 7 is formed on the inner surface of the rear glass substrate 2 so as to be orthogonal to the electrodes 4 and the auxiliary electrodes 3. Further, the auxiliary electrode 5 formed of the dielectric film 7 is formed so as to face at least a part of the auxiliary electrode 3. The front glass substrate 1 and the rear glass substrate 2 are sealed with a glass sealant 9, and a dischargeable gas such as Ne gas is sealed inside the panel.

FIG. 3 shows an example of drive voltage waveforms for driving the plasma display panel shown in FIG. In FIG. 3, φY ₁ is a voltage waveform applied to the _first electrode Y ₁ of the display-like electrode 6, and φY ₂ is the second electrode Y _{2 of the} display electrode 6.
The voltage waveform applied to, also, .phi.X ₁ is a voltage waveform example applied to the first electrode X ₁ of the display electrode 4, the voltage waveform .phi.X ₁ is the voltage waveform .phi.Y ₁ and .phi.Y ₂ It is a voltage pulse of opposite phase, and is applied according to the presence or absence of data.
ΦAX is a voltage waveform applied to the auxiliary electrode 3,
The voltage waveform φAX is also a voltage pulse having a phase opposite to that of the voltage waveforms φY _{1 and} φY ₂ , and the selection pulse is always applied.

The above is the same as the driving method of the conventional plasma display panel having the auxiliary cell for improving the discharge delay,
The feature of the present invention resides in that the voltage waveform φAY is applied to the auxiliary electrode 5 in FIG. The voltage waveform φAY is such that a selection pulse having the same phase as the scan voltages Y ₁ and Y ₂ is generated only in the blank period shown by the broken line in FIG. Therefore, the auxiliary cell formed by the auxiliary electrode 3 and the auxiliary electrode 5 is
Since it is always in the selected state every blank period assigned at the beginning of the scanning period of each display cell, discharge is easier to form than any other discharge cell, and the auxiliary cell by the auxiliary electrode 3 and the auxiliary electrode 5 is discharged once. Then, the auxiliary cells formed by the auxiliary electrode 3 and the scanning electrode 6 and provided in the same manner as in the conventional case also generate discharge one after another.

Now, assume that the frequency of the voltage pulse is 400 kHz and the duty cycle is 1/40. For a refresh type AC plasma display panel, the blanking time is usually 10 scan times.
%, The effective frequency of the high-voltage pulse applied to the auxiliary cell according to the present invention is 40 kHz, and the effective frequency of the high-voltage pulse applied to the display cell and the conventional auxiliary cell is 9 kHz. It can be understood whether the cell has a condition that it is easy to discharge. Further, the auxiliary cell according to the present invention has a high effective frequency of the applied voltage pulse, so that there is a problem that the electrode is more deteriorated than other discharge cells. However, such a problem is as shown in FIG. In addition, the problem can be solved by covering the electrode with two layers of dielectric films 7 and 8 and controlling the discharge current.

FIG. 4 is an electrode configuration diagram of an XY dot matrix type plasma display panel used in the second embodiment of the present invention, in which the scanning electrode is an X electrode composed of electrodes X _{1 to} X ₉ indicated by electrode 4 ′, and the panel An application example of the present invention when a conventional auxiliary cell cannot be formed by the scan electrode 4'and the auxiliary electrode due to size restrictions or the like is shown.

The auxiliary electrode 5 '(electrode AY) provided on the rear substrate side and the auxiliary electrode 3' (electrode AX) provided on the front substrate side are respectively scanned at the ends in the arrangement direction of the scanning electrodes 4 '. It is formed in parallel with the electrode 4 ', and the auxiliary electrode 3'and the auxiliary electrode 5'are formed opposite to each other at a position beyond at least a region where the data electrode 6'is formed. The auxiliary electrode 5'includes
A selection voltage panel having the same phase as that of the data electrode 6'formed on the same substrate is constantly applied, while the auxiliary electrode 3'is applied to the scanning electrode 4'only during a blank period of display allocated within one scan. A selection pulse having the same phase as the applied scanning voltage panel is applied.

Since the auxiliary cell formed by the auxiliary electrode 3'and the auxiliary electrode 5'is always in the selected state during the blank period set at the beginning of each scan, the discharge is started in an extremely short time after the power is turned on. Since the photons, charges or the like formed in the auxiliary cell are supplied into the display cell, the display cell can also start discharging very quickly.

(Effects of the Invention) As described above, the driving method of the plasma display panel of the present invention has an effect that the initial discharge delay characteristic can be improved by a very simple method. Due to the limitation of the panel size, the structure of the panel, etc., the auxiliary cell formed by facing the scanning electrode and one auxiliary electrode, which has been conventionally used, is effective when a sufficient effect cannot be obtained. large.
Even when the auxiliary cell formed by facing the scanning electrode and one auxiliary electrode, which has been conventionally used, cannot be provided due to design restrictions such as the shape and wiring conditions of the plasma display panel, it is possible to prevent The initial discharge delay characteristic can be improved by providing an auxiliary cell in which two auxiliary electrodes are opposed to each other in the plasma display panel. For example, in the case of the plasma display shown in FIG. 4, an auxiliary electrode cannot be provided at the upper end and the lower end of the scanning electrode 4'due to design restrictions (from the upper and lower ends of the auxiliary electrode 5'in FIG. 4). The horizontal broken line extending to the right indicates a simple wiring provided in the seal portion of the plasma display panel, not an electrode). When there is a portion where the auxiliary electrode is provided adjacent to the left end of the data electrode 6 ', Although it is not possible to provide a scanning electrode, that is, an auxiliary cell that opposes the scanning electrode and the auxiliary electrode, it is possible to provide an auxiliary cell that opposes the auxiliary electrodes 3'and 5'according to the present invention. In the first and second embodiments of the present invention, the case where voltage pulses of the same level with mutually different phases are applied to the X electrode and the Y electrode as the drive waveform of the panel has been shown. It is obvious that the present invention is not limited to such a drive waveform, and can be applied to, for example, a unidrive method in which a high voltage pulse is applied to only one electrode and the other electrode is turned on and off to the ground level. Further, in the present embodiment, the case where the selection pulse is always applied to one of the auxiliary electrodes has been described, but the present invention applies the selection pulse only to a blank period of the display to such an electrode, and to both auxiliary electrodes. It is obvious that the same condition can be obtained when the selected voltage pulse is applied only in the blank period.

[Brief description of drawings]

FIG. 1 is a diagram showing the electrode structure of a panel used in the first embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA 'shown in FIG. 1, and FIG.
Waveform diagram showing the voltage for driving the panel shown in FIG.
The figure is an electrode configuration diagram of a panel used in the second embodiment of the present invention. 1 ... Front glass substrate, 2 ... Rear glass substrate, 3,5 ...
… Auxiliary electrodes, 4,6 …… Display electrodes, 7,8 …… Dielectric film, 9
...... Glass sealant.

Claims (3)

[Claims] 1. A first and a second substrate with a gas sealed between them, a plurality of first electrodes provided in parallel to each other on the inner surface of the first substrate and covered with a dielectric film, and the first and second electrodes. A plurality of second electrodes provided in parallel to each other in a direction intersecting with the first electrode and covered with a dielectric film on the inner surface of the second substrate;
Each of the electrodes forming one of the plurality of first electrodes or the plurality of second electrodes is sequentially scanned to apply a scanning voltage to them, and is selected when the scanning voltage is applied to each of the electrodes forming the other. In the method of driving the plasma display panel, the voltage for data is applied, the first
A voltage waveform having the same phase as the voltage waveform applied to the first electrode on the first auxiliary electrode provided on the substrate and covered with the dielectric film in the blank period provided at least during the application of the scanning voltage. A voltage waveform applied to the second electrode, which is applied to the second auxiliary electrode which is provided on the second substrate and at least partly faces the first auxiliary electrode and is covered with a dielectric film. A method of driving a plasma display panel, wherein in-phase voltage waveforms are applied only during the blank period. 2. The first and second auxiliary electrodes or the first or second auxiliary electrodes in a portion where the first and second auxiliary electrodes face each other more than the number of coating layers of the dielectric film on the first and second electrodes. 2. The plasma display panel driving method according to claim 1, wherein the number of coating layers of the dielectric film on one of the second auxiliary electrodes is larger. 3. A first and a second substrate having a gas sealed between them, a first electrode and a first auxiliary electrode provided on the inner surface of the first substrate and covered with a dielectric film, A second electrode provided on the inner surface of the second substrate and covered with a dielectric film; and a second auxiliary electrode, wherein the number of layers of the dielectric film is greater than the number of layers of the dielectric film with respect to the first and second electrodes. It is characterized in that the number of coating layers of the dielectric film on the first and second auxiliary electrodes or on the first or second auxiliary electrodes in the portion where the first and second auxiliary electrodes face each other is higher. Plasma display panel.