KR20030079244A - Method of Driving AC Type Plasma Display Panel - Google Patents

Abstract

PURPOSE: A method for driving an AC type plasma display panel is provided to maximize an operating margin by applying the same reset voltage to each subfield and setting equally the capacity of wall charges stacked on each electrode. CONSTITUTION: A method for driving an AC type plasma display panel is performed to display a gray scale by means of one frame. One frame is formed with plural subfields. Each subfield includes a reset block, an addressing block, and a sustain block. A reset voltage of the first subfield and each reset voltage of the second to the last subfield are set up as the same voltage value. The capacity of wall charges which is stacked on each dielectric of a sustain electrode, a scan electrode, and an address electrode is equally set by an operation of reset discharge. The wall charges are generated in the first subfield by discharging the sustain electrode, the scan electrode, and the address electrode. The address discharge is induced in the second subfield by generating the sustain discharge between the sustain electrode and the scan electrode.

Description

AC type plasma display panel driving method {Method of Driving AC Type Plasma Display Panel}

The present invention relates to the driving of a plasma display panel, and in particular, an alternating current type plasma that enables optimization of operating margin and high contrast ratio by improving driving waveforms used for alternating current PDP panel driving. The present invention relates to a display panel driving method.

Recently, unlike conventional CRT (Cathode Ray Tube) or LCD (Liquid Crystal Display), Plasma Display Panel (Plasma) is a digital display device that can adjust brightness by digital signal and display large screen more clearly. Interest in display panels) is increasing rapidly.

The PDP panel displays characters or graphics using light emitted from the plasma generated during gas discharge. The driving method of the PDP panel is based on a voltage application method, that is, an electrode is applied according to an external voltage application method to make a plasma. It is classified into direct current (DC) type, which is directly exposed to conduction current and flows directly through the electrode, and alternating current (AC) type where displacement current flows because the electrode is not directly exposed because the electrode is covered with a dielectric. can do.

A typical AC type PDP panel is composed of two glass substrates (Glass Substrate), a front plate and a back plate, as shown in some of the perspective view shown in FIG.

The sustain glass 5 and the scan electrode 4 are raised on the front glass substrate 1, and the address electrode 8 is placed on the insulator layer 7 on the rear glass substrate 6. Dielectric layer (2), barrier rib (9), fluorescent layer (10) is raised, the front glass substrate (1) and the back glass substrate (6) and the scan electrode (4) and the sustain electrode (5) The PDP panel is completed by inserting the discharge space 11 so that the address electrodes 8 are orthogonal, and assembling, sealing, exhausting, and gas encapsulating.

At this time, an MgO protective film 3 is deposited on the surface of the dielectric layer 2, and at least one of helium (He), neon (Ne), and argon (Ar) and xenon (Xe) are discharged in the discharge space 11 as a discharge gas. ) Is mixed and sealed, and a discharge cell 12 is constructed.

Then, as an electrode array of the aforementioned AC type PDP panel, is shown in Figure 2 the accompanying drawings, 'M × N' of and has a matrix structure, the heat (Column) direction, the address electrodes (A ₁ ~ M column A _m ) Are arranged, and the scan electrodes SCN ₁ to SCN _n and the sustain electrodes SUS ₁ to SUS _n of N rows are arranged in the row direction, and the discharge cells 12 configured in the discharge space 11 are arranged. Is implemented in the area as shown in FIG.

ADS (Address Display Period Separated) method is mainly used as a driving method of the conventional AC type PDP panel. As shown in FIG. 3, the ADS driving method usually includes one frame and eight frames. The subfields SF1 to SF8 are divided into subfields, and each subfield SF1 to SF8 separates a section in which writing is performed and a section in which sustain discharge is performed according to the scan electrodes SCN ₁ to SCN _n . The timing is arranged so that all sustain discharges proceed simultaneously.

Meanwhile, a conventional European patent application No. 2000-0101099 (2000.01.20) shows a driving waveform for driving an AC PDP panel according to an ADS driving method in the form of a timing diagram as shown in FIG. 4. Each of the eight subfields is divided into a reset section for full screen writing and erasing, an addressing section, and a sustain section for continuous display.

The seven subfields except the first subfield among the eight subfields perform a part of the initialization operation of the initialization section simultaneously with the maintenance operation of the maintenance section of the previous subfield.

That is, according to the conventional ADS driving method, by integrating the second and subsequent initialization sections with the sustain section of the preceding subfield, the discharge required in the initialization section is initialized with the sustain pulses of the selected sustain section, so that By shortening the time, the time used for sustain discharge can be increased, the erasing interval can be eliminated, and the initializing discharge displayed on the black screen is minimized to improve the contrast.

In the related art, a weak discharge is generated by using a ramp wave to uniformly write wall charges of all PDP cells in an initialization period of a first subfield to implement a high contrast ratio. In the initialization section in the subfield after the subfield, the discharge is generated only in the cells which have been sustain discharged, and is not discharged in the cells which have not been sustain discharged, and the wall charges generated by the initial initialization discharge are maintained as they are.

However, in the conventional driving waveform as shown in FIG. 4, the difference in the amount of wall charges accumulated in the dielectric surface of the sustain, scan, and address electrodes generated in the initialization period of the first subfield and the amount of wall charges generated in the initialization period of the second subfield is different. It has a limit of narrowing the operating margin.

In addition, by generating a weak discharge using a lamp wave once per frame has a disadvantage that the contrast ratio is limited to about '3000: 1'.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its object is to use the drive waveform of the AC type PDP panel by using the same relative voltage value of the initialization voltage in each subfield, and thus the dielectric of each electrode by the initialization discharge. The amount of wall charges accumulated above is the same to maximize the operating margin.

Another object of the present invention is to apply the initialization waveform of the first subfield of the AC-type PDP panel driving waveform only once when the PDP panel is driven for the first time, and the subsequent subfields are applied with the same initialization waveform as the second subfield. To achieve high contrast ratios.

1 is a perspective view of a portion of a typical AC PDP panel.

2 is a diagram showing an electrode arrangement of a conventional AC PDP panel.

3 is a timing configuration diagram for one frame in the ADS driving method applied to a conventional AC type PDP panel.

4 is a timing diagram showing a drive waveform for driving a conventional AC PDP panel according to the ADS driving method.

5 is a timing diagram showing driving waveforms applied to an AC PDP panel according to an embodiment of the present invention;

6 is a timing diagram showing driving waveforms applied to an AC PDP panel according to another embodiment of the present invention;

According to an aspect of the present invention, there is provided a method of driving an AC plasma display panel in which one frame is formed by a plurality of subfields classified into an initialization section, a writing section, and a sustain section. In the first subfield constituting the one frame and the relative voltage values of the second and subsequent subfields are applied with the same driving waveform, and are stored on the dielectrics of the dielectrics of the sustain, scan, and address electrodes by initializing discharge. An object of the present invention is to provide an alternating current (AC) type plasma display panel driving method having the same amount of wall charges.

Here, the first sub-field generates wall voltages by generating discharges in the sustain, scan, and address electrodes as the wall voltages accumulated on the surfaces of the sustain electrodes and the protective electrodes of the scan electrodes exceed the predetermined discharge start voltages. The second subfield is characterized by generating sustain discharge between the sustain electrode and the scan electrode by using the wall voltage inside the PDP cell to induce the discharge of the address electrode to generate the wall voltage distribution of the same size.

In the AC plasma display panel driving method, the initialization waveform of the first subfield is applied only when the AC PDP panel is first driven, and the initialization waveform of the second subfield is the same as the initialization waveform of the second subfield. It is characterized by applying a drive waveform.

In addition, the driving waveform applied to the initialization section is applied so that the discharge in the initialization section has a voltage value of the same magnitude for each subfield constituting one frame, so as to maintain the relative wall charges of the same magnitude, scan, and address electrodes. It is characterized by charging over each dielectric.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The AC type PDP panel to which the present invention is applied is the same as the general AC type PDP panel shown in FIG. 1, and the electrode arrangement of the corresponding PDP panel is also the same as that shown in FIG. 2, and a description thereof will be omitted.

In the AC type PDP panel driving method according to an embodiment of the present invention for driving such an AC type PDP panel, a driving waveform as shown in FIG. 5 is applied. This is based on the conventional driving waveform shown in FIG. The operating margin, which is a problem in the ADS driving method, can be optimized, and the contrast ratio can be realized up to '∞: 1'.

In more detail, as shown in FIG. 5, the AC-type PDP panel driving waveform according to the embodiment of the present invention includes one subframe consisting of eight subfields, and each subfield is a full-screen write discharge. Reset interval to make all cells uniform through full-screen erase discharge, and addressing interval to designate cells to be displayed on all scan lines in order It is divided into a sustain section that sustains discharge by applying a sustain pulse of.

At this time, among the eight subfields constituting one frame, the initialization voltage VyR1 of the first subfield and the other subfields, that is, the initialization voltage VyR2 of the second subfield to the eighth subfield, are equal to each other. By setting the same amount of wall charges accumulated on each dielectric of the sustain, scan, and address electrodes by the initialization discharge, the operation margin due to the difference in the amount of wall charges in the initialization section can be maximized.

According to the driving waveform shown in FIG. 5, in the first subfield, the wall voltage accumulated on the surface of the protective film of the sustain electrode and the scan electrode exceeds the discharge start voltage in the PDP cell without the wall voltage. Accordingly, discharge is generated in the sustain, scan, and address electrodes to perform a kind of priming action of generating wall voltage.

Subsequently, in the second subfield, sustain discharge is generated between the sustain electrode and the scan electrode by using the wall voltage inside the cell, and the sustain discharge induces the discharge of the address electrode to generate wall voltage distribution of the same magnitude.

In the AC PDP panel drive waveform shown in FIG. 5, the initialization voltages of the first subfield and the initialization voltages (VyR1, VyR2, ...) of all the subfields after the second subfield are made equal to each other. By the electric field applied to each electrode, the generated charges can maintain the same amount of wall charges accumulated on the surface of the dielectric on each electrode for each initialization period of each subfield. An initializing waveform is applied only when the PDP panel is first driven, and a high contrast ratio of '∞: 1' can be realized by applying the same waveform as the initializing waveform of the second subfield in the initializing section of the subfield.

As described above, the driving waveform proposed in the present invention implements a high contrast ratio of '∞: 1' by designing a waveform such that the discharge in the initialization section affecting the contrast ratio becomes a voltage having the same relative magnitude in each subfield. In this case, in the AC PDP panel, the rectangular waveform of the present invention can be implemented with various voltage values as the scan electrode and the sustain electrode, the scan electrode and the address electrode, the sustain electrode and the address electrode operate with relative voltage values.

That is, as another embodiment of the present invention, the driving waveform as shown in Figure 6 of the accompanying drawings can be applied to the AC type PDP panel, which is the waveform of the initializing section in the rectangular waveform of Figure 5 generates a strong discharge In order to make the wall voltage the same by maintaining a constant voltage as a characteristic of sustain discharge, a ramp waveform as shown in FIG. 6 is applied to each subfield in order to make the cells having non-uniformity substantially practically produced in an AC PDP panel. In the present invention, even when the initialization waveform is in various forms, by applying an electric field of the same magnitude in the initialization section, a relative wall charge of the same magnitude is formed.

In addition, the embodiments according to the present invention are not limited to the above-described embodiments, and various alternatives, modifications, and changes can be made within the scope apparent to those skilled in the art.

As described above, the present invention uses the same drive voltage of the AC PDP panel as the relative voltage value of the initialization voltage in each subfield, thereby equalizing the amount of wall charges accumulated on the dielectric of each electrode by the initialization discharge. Through this, it is possible to maximize the operating margin.

In addition, the present invention applies the initialization waveform of the first subfield of the AC-type PDP panel driving waveform only once when the PDP panel is first driven, and the subsequent subfields apply the same initialization waveform as the second subfield, thereby providing infinite high Contrast ratio can be realized.

Claims (4)

In a driving method of an AC plasma display panel in which one frame is formed by a plurality of subfields classified into an initialization period, a writing period, and a sustain period, and gray level display is performed. The wall charges accumulated on the dielectrics of the sustain, scan, and address electrodes by the initializing discharge by applying the same driving waveform to the initializing voltages of the first subfield and the second and subsequent subfields of the frame. AC plasma display panel drive method, characterized in that the same amount. The method of claim 1, The first subfield generates a wall voltage by generating a discharge on the sustain, scan, and address electrodes as the wall voltage accumulated on the surface of the sustain electrode and the protective electrode of the scan electrode exceeds a predetermined discharge start voltage. The field uses the wall voltage inside the PDP cell to generate sustain discharge between the sustain electrode and the scan electrode to induce the discharge of the address electrode to generate wall voltage distribution of the same size. . The method of claim 1, The initialization waveform of the first subfield is applied only when the AC-type PDP panel is driven for the first time, and the same driving waveform as the initialization waveform of the second subfield is applied in the initialization section of the second and subsequent subfields. Panel drive method. The method of claim 1 or 3, The driving waveform applied to the initialization section is applied so that the discharge in the initialization section has a voltage value of the same magnitude for each subfield constituting one frame, so as to maintain the relative wall charges of the same magnitude, each of the scan and address electrodes. An alternating current plasma display panel driving method comprising: charging a dielectric.