JP3184291B2 - Driving method and apparatus for discharge display panel and discharge display panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for driving electrodes of a memory type discharge display panel and a discharge display panel.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a schematic configuration of a DC type pulse memory discharge display panel provided with electrodes for an AC type discharge (discharge between an exposed electrode and an electrode covered with a dielectric). A conventional example of a voltage waveform is shown in Fig. 3 (Seki et al .: "Study of high-density display cells in pulse memory discharge display panel", Proceedings of the IEICE Spring Conference, C-469, 19
1991). Anode DA _j, cathode K _i is the exposed electrode, auxiliary electrode A _i is an electrode covered with a dielectric. Since this panel performs an auxiliary discharge in the display cell, it is not necessary to provide an auxiliary cell independently, so that the display cell can have a high density. Furthermore, since the auxiliary discharge between the anode and the auxiliary electrode and between the cathode and the auxiliary electrode is an AC type discharge, light emission due to the auxiliary discharge is weak, and a decrease in contrast ratio is suppressed.

The operation of a conventional pulse memory drive will be briefly described with reference to FIGS. The anode DA _j is applied repeatedly a constant period of the sustain pulse SP at all times, the amplitude V _sp and pulse width of the sustain pulse SP write pulse WP
Is set in advance so that the sustain pulse discharge started by the above can be maintained. The auxiliary electrode scanning pulse AP from the first row auxiliary electrodes A _1, the cathode first scan pulse FKP and second cathode scanning pulse SKP is sequentially applied from the first row cathodes K _1. In the display cell D _ij , the auxiliary electrode scan pulse AP and the cathode first scan pulse FKP perform an AC type auxiliary discharge between the anode and the cathode and the auxiliary electrode, and after a lapse of a certain time from the auxiliary discharge, the cathode second scan pulse SKP And the anode D at substantially the same timing as the cathode second scanning pulse SKP.
A DC address discharge is performed together with the address pulse WP given to A _j . Writing is performed at a timing at which metastable particles and the like generated by the auxiliary discharge are reduced to an optimum value.
It is sufficient to stop one or more times a sustain pulse discharge by applying an erase pulse EP to the cathode K _i to stop the sustain pulse discharge in the display cell D _ij. The metastable particles and the like generated by the auxiliary discharge suppress the delay of the discharge start at the time of writing, and function as priming particles for performing stable writing. If the number of particles is too large, there is a disadvantage that cells which have not been selected are written. Therefore, it is necessary to control the amount to the minimum necessary. Therefore, since writing is performed in a state where the amount of priming is relatively small, the voltage required for writing is reduced.
It is relatively large at about 300V.

[0004]

In the [0006] conventional driving method as described above, since the applied to the display cell D _ij a large DC voltage for writing, the discharge current during writing is increased, the cathode There is a disadvantage that the spatter increases and the life of the panel is shortened.

As one method of suppressing the discharge current at the time of writing, it is conceivable to use AC discharge for writing.
However, in the pulse memory type discharge panel, it is necessary to generate a certain amount of metastable particles or the like by the address discharge in order to connect the address discharge to the sustain pulse discharge. Therefore, in order to perform stable writing, there is a disadvantage that the voltage for causing the AC type discharge is also increased.

SUMMARY OF THE INVENTION An object of the present invention is to provide a discharge display panel which eliminates the above-mentioned drawbacks, simultaneously writes a DC discharge and an AC discharge, reduces the voltage required for the address discharge, and reduces the discharge current of the address discharge. A driving method, a device, and a discharge display panel are provided.

[0007]

In order to achieve this object, a method of driving a discharge display panel according to the present invention comprises at least two sets of exposed electrodes which are disposed opposite to each other and are exposed to a discharge cell, and at least one set of dielectric electrodes. A discharge cell having electrodes covered with a body is arranged in a matrix, a sustain pulse is continuously applied to the discharge cell, and a sustain pulse discharge started by an address pulse is continued until an erase pulse is applied. In driving the above-described pulse memory type discharge display panel, a pulse is applied to the discharge cells so that the DC discharge and the AC type discharge through the dielectric layer simultaneously become an address discharge.

The method of driving a discharge display panel according to the present invention is characterized in that a sustain pulse whose phase is controlled is used as a write pulse without using an independent write pulse.

Further, a driving apparatus for a discharge display panel according to the present invention includes a discharge device having at least two sets of exposed electrodes which are disposed to face each other and are exposed to a discharge cell, and at least one set of electrodes covered with a dielectric. Drives a pulse memory type discharge display panel in which cells are arranged in a matrix and sustain pulses are continuously applied to discharge cells, and sustain pulse discharge started by a write pulse is continued until an erase pulse is applied. A driving device for a pulse memory type discharge display panel for applying a pulse to the discharge cells so that a direct current discharge and an alternating current type discharge through a dielectric layer simultaneously become an address discharge. It is characterized by comprising at least.

Further, the discharge display panel of the present invention is provided so as to face at least two sets of exposed electrodes exposed to a discharge cell in which a direct-current discharge for writing is performed between the electrodes, and the two sets of exposed electrodes. A discharge cell having a set of electrodes covered with a dielectric is formed in a matrix form with respect to a discharge cell in which an AC type discharge for writing via a dielectric layer is performed simultaneously with the DC discharge with one of the sets. It is characterized by being arranged in.

[0011]

According to the present invention, the main function is to provide a trigger for the AC type address discharge to cause a DC address discharge, and it is not necessary to generate sufficient metastable particles in advance. The voltage required to cause this is small. Further, since the AC type discharge is a trigger of the DC discharge, the DC voltage applied to the discharge cells for writing can be small, and the discharge current at the time of writing can be reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows a first embodiment of a basic electrode drive waveform of the present invention. In this embodiment, the cathode K _i exposed the write pulse WP was applied to the exposed anode DA _j
At the same time as generating a direct current discharge with the cathode scanning pulse KP applied to the sub-electrode A _i and writing, the auxiliary electrode A _i covered with the dielectric material is written.
, The AC type discharge is caused by the auxiliary electrode second scan pulse SAP and the address pulse WP applied to the address, and the address is determined. Anode
Since the voltage applied between the cathodes is small, DC discharge does not occur as it is, but DC discharge occurs because charged particles and metastable particles generated by AC-type discharge help DC discharge. By performing such driving, the discharge current flowing at the time of writing can be sufficiently reduced as compared with the case of the conventional driving, while maintaining stable writing characteristics.

Japanese Patent Application No. 2-10747 filed by the present applicant
In the case where the present invention is applied to a gas discharge display panel in which the form of the auxiliary discharge described in the specification of No. 0 “Gas discharge display panel” is an AC type discharge, the discharge current at the time of writing is a conventional driving operation About 40%. Also at this time, 10 × 10
When the cells were written in a checkered pattern, the stable operation voltage range of the write pulse WP applied to the display cell _Dij was about 50 V, which was a sufficient value. From the above results, it has been proved that the present invention is more effective in reducing the discharge current at the time of writing while maintaining stable writing characteristics.

According to the present invention, since the DC voltage applied to the display cell at the time of writing can be small, the cathode scanning pulse K
The amplitude V _k of P can be the same as the bias voltage V _B of the cathode, in the conventional driving can be a cathode driving circuit that controlled the voltage of the three values in the control of the binary.

FIG. 4 shows a second embodiment of the electrode drive waveform of the present invention. In the second embodiment, the sustain pulse SP is used as a write pulse by controlling the phase of the sustain pulse SP without using an independent write pulse. This writing method will be described with reference to a driving waveform example in FIG. Sustain pulse S
The phase of P is controlled by the presence or absence of writing. When writing is not performed, the position of the sustain pulse SP does not change as shown in FIG. 5A, but when writing is performed, the phase of the sustain pulse SP is controlled as shown in FIG. Pulse K
Write discharge is caused by P and the auxiliary electrode second scan pulse SAP. The change in the phase of the sustain pulse SP has little effect on the sustain pulse discharge of the other discharge cells, so that there is no practical problem.

Even with the electrode drive waveform shown in FIG. 6 in which the period of the sustain pulse SP in FIG. 1 is an integral multiple of the write access period, the effect of the present invention is the same as that of FIG. I do. In this embodiment, the present invention is applied to the driving method of a discharge display panel described in the specification of Japanese Patent Application No. 1-158374 filed by the present applicant. DA _j and reactive power loss based on the capacitance between the cathode K _i can be reduced.

The present invention is applicable to any type of gas that is driven by a DC pulse memory having an AC discharge electrode, regardless of the positional relationship between the electrodes in the discharge cell, the presence or absence of an auxiliary cell, and the method of arranging the discharge cell. Applicable to discharge panels. In addition,
It is obvious that slight deviations in the timing of each pulse in the driving waveforms shown in FIGS. 1, 4 and 6 do not affect the essence of the present invention.

In the first, second and third embodiments, the method of sequentially accessing the cathode _Ki has been described.
Cathode K _i How to access randomly and literature (Kaji other: "halftone video display by the AC plasma display", TV Society of image display system Study Group documentation No.11-4,
1973) is also applicable. When the writing speed is low, this driving method can be applied to a method without auxiliary discharge. In addition,
Similar to the present invention, a driving method for simultaneously generating a DC discharge and an AC type discharge in the same cell has been disclosed ("High-Res
olution dc ColorPlasma Display Panels, "Soc. Infor
mation Display, Digest Tech. Papers, pp. 355-357, 1
989) However, while the present invention uses DC discharge and AC type discharge for the purpose of reducing the write current at the time of pulse memory drive, in this case, the point that is not intended for memory drive and AC type discharge are used. The present invention is clearly different from the present invention in that an auxiliary discharge is used instead of writing.

[0019]

As described above in detail, according to the present invention, in the pulse memory driving method of the discharge display panel, the discharge current flowing at the time of writing can be reduced. The reduction of the discharge current suppresses the sputtering of the cathode, which is a major factor in the deterioration of the life of the panel, and as a result, the life of the panel can be extended. Further, since a small DC voltage is applied to the display cell at the time of writing, the amplitude of the cathode scanning pulse can be reduced, and the breakdown voltage of the cathode drive circuit can be reduced. The drive circuit can be simplified by making the amplitude of the cathode scan pulse equal to the bias voltage of the cathode and changing the cathode drive circuit, which used to control three voltage values in the conventional drive, to binary control. it can. Further, when the writing method is a method of controlling the phase of the sustain pulse as described in the second embodiment, all the driving pulses necessary for driving the panel can be constituted by binary voltage values.
This is advantageous in performing C conversion.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of an electrode drive waveform according to the present invention.

FIG. 2 is a diagram showing a configuration example of a discharge display panel to which the present invention can be applied.

FIG. 3 is a diagram showing an electrode driving waveform according to a conventional technique.

FIG. 4 is a diagram showing a second embodiment of the electrode drive waveform according to the present invention.

FIGS. 5A and 5B are diagrams showing driving waveforms of an anode and a cathode in a second embodiment of the electrode driving waveform. FIG.
(b) shows the case where there is writing.

FIG. 6 is a diagram showing a third embodiment of the electrode drive waveform according to the present invention.

[Explanation of symbols]

K _i (i = 1, 2 --- n) Cathode A _i (i = 1, 2 --- n) Auxiliary electrode DA _j (j = 1, 2 --- m) Anode _Dij Display cell SP sustain pulse WP address pulse KP cathode scanning pulse FKP cathode first scan pulse SKP cathode second scan pulse AP auxiliary electrode scanning pulse FAP auxiliary electrode voltage amplitude V _K of the first scan pulse SAP auxiliary electrode second scan pulse EP erase pulse V _SP sustain pulse Voltage amplitude of cathode scan pulse V _B Bias voltage of cathode

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroshi Murakami 1-10-11 Kinuta, Setagaya-ku, Tokyo Japan Broadcasting Corporation Research Institute of Broadcasting Technology (56) References JP-A-52-90230 (JP, A) 55-46471 (JP, A) (58) Fields studied (Int. Cl. ⁷ , DB name) G09G 3/288 G09G 3/20

Claims (4)

(57) [Claims] A discharge cell having at least two sets of exposed electrodes facing each other and exposed to a discharge cell, and at least one set of electrodes covered with a dielectric is arranged in a matrix, and a sustain pulse is provided. Is applied to the discharge cells so that the sustain pulse discharge started by the write pulse is continued until the erase pulse is applied. A method for driving a discharge display panel, characterized in that a pulse is applied to the discharge cells so that the alternating-current type discharges simultaneously become address discharges. 2. The driving method according to claim 1, wherein a sustain pulse whose phase is controlled is used as an address pulse without using an independent address pulse. (3) Exposed to the discharge cells
At least two sets of exposed electrodes and at least one set of dielectric
Discharge cells with electrodes covered with the body in a matrix
Place, apply sustain pulse continuously to discharge cells, write
The sustain pulse discharge started by the
Pulse memory type discharge that continues until applied
Memory-type discharge display for driving electronic display panels
A driving device for a panel, the driving device comprising:
The AC type discharge through the dielectric layer becomes the address discharge at the same time
Means for applying a pulse to the discharge cell
Driving device for discharge display panel characterized by comprising:
Place. (4) The electrodes are placed opposite to each other and write
At least the exposed DC cells are exposed to discharge cells
And two sets of exposed electrodes, and one set of the two sets of exposed electrodes.
The AC type discharge for writing through the dielectric layer between the DC
Covered with dielectric for discharge cells performed simultaneously with discharge
Discharge cells with one set of electrodes are arranged in a matrix
A discharge display panel, comprising: