JP2670411B2 - Driving method of plasma 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 plasma display panel, and more particularly to a method of driving a plasma display panel.

[0002]

2. Description of the Related Art Conventional plasma display devices include an AC type and a DC type. Among them, the AC type is excellent in the life of the cathode material. In particular, in the case of a color plasma display panel, the driving voltage is higher than that of a single color of neon-orange and the discharge gas itself is heavy, so that it is difficult to solve the life problem with the current nickel thick film. The present invention was proposed from the idea of introducing an AC type cathode (that is, a cathode in which a dielectric layer and a MgO layer are coated on the electrode) into a DC type plasma display panel. However, if the AC type is used as an electrode, the discharge is stopped immediately after discharging once according to the AC type discharge principle, but the sustain type is driven by an alternating current and the DC type driving method is adopted as it is for displaying and erasing.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to drive a plasma display panel capable of stable operation by separating sustain and scan in timing and eliminating the coupling of display discharge and sustain discharge. It is to provide.

[0004]

In order to achieve the above-mentioned object, a method of driving a plasma display panel according to the present invention is characterized in that a display anode forms a matrix horizontally and a scanning cathode forms a matrix vertically, and a sustaining electrode for sustaining discharge. In a method of driving a plasma display panel having a horizontal stripe pattern, a positive waveform data signal is input to the display anode and a negative waveform is sequentially operated to the scanning cathode at a duty of 1 / scan line number. The sustain electrode inputs an alternating wave of a constant cycle, and a constant voltage is applied to the cathode to maintain the same by wall charges on the sustain electrode and wall charges on the cathode.

Further, the driving method of the plasma display panel of the present invention is a plasma display panel in which display anodes are arranged horizontally and scanning cathodes are arranged vertically to form a matrix, and sustain electrodes for sustaining discharge are formed in stripes in the vertical direction . Drive
In the method , a positive waveform data signal is input to the display anode, a negative waveform is sequentially operated to the scanning cathode at a duty of 1 / scan line number, a sustain electrode receives an alternating wave of a constant period, and a cathode is input to the cathode. It is characterized in that it is maintained by the wall charges on the sustain electrode and the cathode by applying a constant voltage.

Furthermore a method of driving a plasma display panel of the present invention, the horizontal display anode driving scanning cathode matrix constitutes a vertically, the discharge sustaining sustain electrodes are formed from a single plate of a plasma display panel In the method , a positive waveform data signal is input to the display anode, a negative waveform is sequentially operated to the scanning cathode at a duty of 1 / scan line number, and the sustain electrode generates an alternating wave of a constant cycle. When a constant voltage is applied to the cathode and applied to the cathode, the voltage is maintained by the wall charge on the sustain electrode and the wall charge on the cathode.

Further, the driving method of the plasma display panel according to the present invention comprises a sequential circuit for selecting the scanning cathode, a sequential simultaneous conversion circuit for transmitting a data signal corresponding to the anode selected by the sequential circuit, and A switching transistor having a control electrode connected to each output terminal of the sequential circuit and an emitter electrode connected to a bias voltage source, a resistance component connected between a common point of the collector electrode of the switching transistor and the cathode, and a ground voltage. And a sustain pulse applying circuit connected to a sustain electrode, wherein a voltage equal to or higher than a discharge start voltage difference is applied to the anode and the cathode to start discharge and before the discharge is erased. In order to maintain the discharge, apply an alternating wave of a constant cycle to the sustain electrode and apply a constant voltage to the cathode. Wherein the erase discharge by applying a pulse width shorter in the cathode.

[0008]

According to the present invention, in the driving method of the plasma display panel, the driving circuit is simplified by completely separating the maintenance and the scanning.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the accompanying drawings.

1A to 1F show the structure of a plasma display panel according to the present invention. In FIG. 1A, an anode 11 is formed on the upper glass front glass 10, and a lower glass rear glass 12 is formed.
A sustain electrode 13 is formed over the entire surface, and a thick dielectric 14 is formed so as to surround the cathode 15 coated with the dielectric 14 thereon.

In FIG. 1B, the structure of the upper plate is the same as that of FIG. 1A, and in the structure of the lower plate, the structure of the sustain electrodes 13 is alternately arranged in parallel with the cathode 15.

In FIG. 1C, the structure of the upper plate is the same as that of FIG. 1A, and the structure of the sustain electrodes 13 in the structure of the lower plate is arranged in the same direction as the arrangement direction of the anodes 11.

In FIG. 1D, an anode 11 is formed on a front glass 10 of the upper plate, and the anode 11 is coated with a dielectric material 16.
A sustain electrode 13 is formed on the entire surface of the lower plate rear glass 12, a dielectric 14 is applied on the sustain electrode 13, a cathode 15 is formed on the dielectric 14, and a dielectric 14 is applied on the cathode 15. did.

In FIG. 1E, the structure of the upper plate is the same as that of FIG. 1D, and in the structure of the lower plate, the structure of the sustain electrodes 13 is alternately arranged in parallel with the cathode 15.

In FIG. 1F, the structure of the upper plate is the same as the structure of FIG. 1D. In the structure of the lower plate, the structure of the sustain electrodes 13 is arranged in parallel with the cathode 15 one by one every two.

In the above structure, the anode 11 is formed with a thin film material such as ITO or Au or a thick film material such as Ni or Au in the same direction. In addition, the dielectric may or may not be applied to the anode depending on the operating conditions. In the present invention, the non-application is advantageous in accumulating charges. In the case of color display, red,
Blue and green phosphors may be applied to the surface of the display electrode or the periphery thereof. However, in this case, He-Xe, He-Xe-Kr, Ne-Xe, and Ne-X having good ultraviolet radiation efficiency.
Enclose the e-Kr mixed gas.

Further, a SiO ₂ and Al ₂ O ₃ thin film or a thick film dielectric layer is coated on the cathode 15 and the sustain electrode 13 of the lower plate rear glass 12, and the upper part thereof is covered with Mg.
The O layer is formed with a thickness of several thousand angstroms.

The partition wall is formed in stripes or a grid with the anode 11. 2 of the ion which collides with the partition
When secondary electron emission is used, it is also effective to form a MgO layer on the partition wall surface. Also, the partition may be formed on the upper plate.

FIG. 2 shows a plasma display panel according to the present invention and a driving unit for driving the same. In FIG. 2, a sequential circuit 1 for selecting a cathode which is a scanning electrode.
A sequential simultaneous conversion circuit 2 for transmitting a data signal to an anode, a base electrode connected to each output terminal of the sequential circuit 1, an emitter electrode connected to a bias voltage source, and a collector connected to the cathode. A switching transistor 3 having an electrode, a resistance component 4 connected between the cathode and a ground voltage, and a sustain pulse application circuit 5 connected between a sustain electrode and a ground voltage alternately arranged in parallel with the cathode. It is composed of

FIG. 3A shows current-voltage characteristics of the plasma display panel according to the present invention. In FIG. 3A, the discharge is started by the discharge start voltage VB or -VB, and then the discharge is generated to maintain the discharge, the discharge is maintained once by the sustain voltage Vs of the positive voltage, and then the negative voltage is maintained. Discharge is maintained by the sustain voltage -Vs. The voltage of the applied waveform is set so that what has been discharged once can be discharged again. In this case, it is needless to say that the wall charge is taken into consideration.

That is, the value obtained by adding the sustain pulse voltage and the wall charge is greater than or equal to the discharge sustain voltage.
Further, the frequency is determined by the number of bits for gradation display and the presence time of charged particles (life time). The waveforms of the display anode and the scanning cathode are set so that the voltage applied to both electrodes at the time of writing becomes higher than the discharge start voltage VB and at the center level of the sustain waveform at the time of sustaining and erasing.

FIG. 3B shows a driving waveform of the plasma display panel of one embodiment according to the present invention. (FIG. 3B, C
In and D, all three waveforms appear to have slightly different magnitudes, but they actually overlap each other. ) In FIG. 3B, pulse A represents the signal waveform applied to the sustain electrodes,
A pulse B shows a waveform applied to the anode, and a pulse C shows a waveform applied to the cathode. If the pulse A is continuously applied to the sustain electrode and the pulse B and the pulse C are applied to the anode and the cathode at the same timing, the display operation is performed. After that, the discharge is maintained by the pulse A. At the time of erasing, a pulse having a shorter period than the pulse applied at the time of writing is applied to the cathode for erasing.

FIG. 3C shows a driving waveform of a plasma display panel according to another embodiment of the present invention. In FIG. 3C, the magnitudes of the pulses applied to the anode and the cathode may be applied in reverse during the writing period of the drive waveform shown in FIG. 3B. That is, at the time of writing, discharge is started by applying a pulse having a discharge start voltage difference or more to the two poles at the anode and the cathode.

FIG. 3D shows a driving method of a plasma display panel according to another embodiment of the present invention. In FIG. 3D, pulse A shows a sustain electrode applied waveform, pulse B shows a display electrode applied waveform, and pulse C shows a scan electrode applied waveform. When the pulse A is continuously applied to the sustain electrode and the pulse B and the pulse C are applied to the display electrode and the scan electrode at the same timing, the display operation is performed. After that, the discharge is maintained by the pulse A. At the time of writing, the discharge is started by the voltage difference applied to the display anode and the scanning cathode.

4A to 5D are views for explaining an operation that occurs inside the panel according to the driving method of the plasma display panel according to the present invention.

FIG. 4A is for explaining the write operation. In FIG. 4A, the write operation corresponds to the period I of the waveform diagram shown in FIG. The voltage difference between the positive pulse applied to the anode and the negative pulse applied to the cathode becomes equal to or higher than the discharge start voltage difference, and discharge occurs, + charge is attached to the surface of the cathode, the cell voltage drops, and the discharge stops. . As a result, a wall voltage is created on the scan electrodes, and at this time, the electrons moving to the display electrodes do not accumulate on the electrode surfaces and flow through the internal circuits.

FIG. 4B is for explaining the sustain operation. The sustain operation of FIG. 4B is performed in the period II of the waveform diagram of FIG.
Corresponds to. Since the cathode has a + charge and rises to the ground potential, it becomes more positive and discharge occurs between the cathode and the sustain electrode. At this time, the cathode acts as an anode and the sustain electrode acts as a cathode. As a result, the sustain electrode has a positive charge and the cathode has a negative charge.
Electric charges are accumulated and wall charges in the direction opposite to the external electric field are created.

FIG. 5C is a view for explaining the sustain operation. The sustain operation of FIG. 5C is performed in the period II of the waveform diagram of FIG.
Corresponds to. Since the potential of the sustain electrode becomes positive again, the sustain electrode acts on the anode and the cathode acts on the cathode to cause the sustain discharge, and the formation of the wall voltage and the accumulation of the charges occur in reverse to the operation of FIG. 4B.

In the sustaining operation shown in FIGS. 4B and 5C, a sustaining pulse having a discharge sustaining voltage difference for sustaining is applied to the sustaining electrodes before the wall charges generated by the writing operation shown in FIG. 4A are erased. Discharge is maintained by applying. Although the above description has been made only for one example, such operations are also applicable to other embodiments.

FIG. 5D is a drawing for explaining the erase operation. The erase operation of FIG. 5D corresponds to the period III of the waveform diagrams of FIGS. 3B, 3C and 3D. Although it should take a predetermined time for the formation of, the wall charge is not generated by shortening the period.

Writing, sustaining, and erasing operations are performed while scanning by such a method.

[0032]

As described above, in the driving method according to the present invention, the driving circuit is simple by separating the maintenance and the scanning, so that the cost can be reduced and the reliability can be improved. Also, since only one sustain circuit is required, it is easy to manufacture.

[Brief description of the drawings]

1A to 1F show a structure of a plasma display panel to which a driving method according to the present invention is applied.

FIG. 2 shows a plasma display panel and a driving circuit for driving the plasma display panel according to the structure of the present invention.

3A shows current-voltage characteristics for driving a plasma display panel of the present invention, FIG. 3B shows a driving waveform of a plasma display panel of one embodiment of the present invention, and FIG. 3C shows a driving waveform of the present invention. FIG. 3D shows a driving waveform of a plasma display panel according to another embodiment, and FIG. 3D shows a driving waveform of a plasma display panel according to still another embodiment of the present invention.

4A and 4B are views for explaining a driving operation according to a driving method of a plasma display panel according to the present invention.

5C and 5D are views for explaining a driving operation according to a driving method of a plasma display panel according to the present invention.

[Explanation of symbols]

1 ... Sequential circuit, 2 ... Sequential simultaneous conversion circuit, 3 ... Switching transistor,
4 ... Resistance component, 5 ... Sustain pulse applying circuit,
10: front glass, 11: anode,
12 ... Back glass, 13 ... Sustaining electrode,
14 ... dielectric, 15 ... cathode.

Claims (12)

(57) [Claims] 1. A driving method for a plasma display panel in which display anodes are arranged horizontally and scanning cathodes are arranged vertically to form a matrix, and discharge sustaining electrodes are formed in stripes in the horizontal direction.
In the method , a positive waveform data signal is input to the display anode, a negative waveform is sequentially operated to the scanning cathode with a duty of 1 / scan line number, a sustain electrode receives an alternating wave of a constant cycle, and a cathode is input to the cathode. A method of driving a plasma display panel, which is characterized in that a constant voltage is applied to maintain a wall charge on a sustain electrode and a wall charge on a cathode. 2. A pre Ki維 lifting electrodes are formed on the lower plate,
It has a plate-like shape, and the dielectric that encloses the scanning cathode and the lower plate
The driving method of a plasma display panel according to claim 1 wherein sandwiched characterized Tei Rukoto formed. 3. A process according to claim 2 Koki <br/> placing the driving method of the plasma display panel, characterized in that the surface of the scanning cathode and the sustain electrode is the dielectric is coated. 4. A driving method for a plasma display panel in which display anodes are arranged horizontally and scanning cathodes are arranged vertically to form a matrix, and discharge sustaining electrodes are formed in stripes in the vertical direction.
In the method , a positive waveform data signal is input to the display anode, a negative waveform is sequentially operated to the scanning cathode with a duty of 1 / scan line number, a sustain electrode receives an alternating wave of a constant cycle, and a cathode is input to the cathode. A method of driving a plasma display panel, which is characterized in that a constant voltage is applied to maintain a wall charge on a sustain electrode and a wall charge on a cathode. 5. Before Kiho electrostatic sustain electrodes are formed on the lower plate, having a plate-like shape, dielectric and lower wrapped scanning cathode
Claim, characterized in Tei Rukoto formed sandwiched plate 4
The driving method of the plasma display panel according to the above item. 6. A claim on the surface of the scanning cathode and the sustain electrode is characterized in that the dielectric is coated 5
The driving method of the plasma display panel according to the above item . 7. A driving method for a plasma display panel , wherein a display anode is arranged horizontally and a scanning cathode is arranged vertically to form a matrix, and a sustaining electrode for sustaining discharge is formed from one plate. , A positive waveform data signal is input to the scanning cathode, a negative waveform is sequentially operated on the scanning cathode at a duty of 1 / scan line number, an alternating wave of a constant cycle is input to the sustain electrode, and a constant voltage is applied to the cathode. A method of driving a plasma display panel, which is characterized in that it is maintained by wall charges on the sustain electrodes and wall charges on the cathode. 8. The discharge sustaining electrode is formed on a lower plate, has a plate-like shape, and includes a dielectric material enclosing a scanning cathode and the lower electrode.
Claim, characterized in Tei Rukoto formed sandwiched plate 7
The driving method of the plasma display panel according to the above item. 9. A driving method of a plasma display panel of said sustain electrode and the surface of the scanning cathode claim 8 wherein Symbol <br/> mounting, wherein a dielectric is coated. 10. A sequential circuit for selecting a scanning cathode, a sequential simultaneous conversion circuit for transmitting a data signal corresponding to an anode selected by the sequential circuit, and a respective output terminal of the sequential circuit. A switching transistor having a control electrode and an emitter electrode connected to a bias voltage source, a resistance component connected between a common point of the switching transistor collector electrode and the cathode, and a ground voltage, and a sustain pulse application connected to a sustain electrode. In a method of driving a plasma display panel comprising a circuit, a voltage of a discharge start voltage difference or more is applied to the anode and the cathode to start discharge, and an alternating wave of a constant cycle is applied to the sustain electrode before the discharge is erased. Applying a constant voltage to the cathode to maintain the discharge and applying a short pulse to the cathode to erase the discharge. The driving method of a plasma display panel, wherein. 11. The plasma display panel is constructed by forming an anode on an upper plate, forming a sustain electrode on the entire lower plate, and applying a dielectric material on the sustain electrode to form a thick layer so as to completely cover the cathode. The driving method of the plasma display panel according to claim 10, wherein 12. The driving method of the plasma display panel as claimed in claim 11, wherein the plasma display panel has an anode formed on an upper plate and a sustain electrode and a cathode are alternately arranged on the lower plate.