KR20000034676A - Method for driving plasma display panel - Google Patents

Abstract

PURPOSE: A method for driving a PDP(Plasma Display Panel) is provided to improve the range of dynamic margin. CONSTITUTION: After driving a scan/maintaining electrode(Y electrode), a driving pulse of high pressure is supplied to a maintaining electrode(X electrode) for operating an entire surface write for a display panel. Herein, a discharged cell by the write voltage contains wall charge. After the entire surface write, discharging pulse of entire surface elimination is supplied to the scan/maintaining electrode for discharging of entire surface elimination. Therefore, the wall charge is eliminated for remaining space charge. While supplying maintaining pulse compensated based on the compensation value of the maintaining voltage to the maintaining electrode or supplying scan/maintaining pulse compensated based on the compensated value of scan/maintaining voltage to the scan/maintaining electrode, an addressing movement is operated for supplying data pulse to an address electrode in the addressing section. Therefore, the data are written, and the maintaining electrode and the scan/maintaining electrode are driven alternately.

Description

Plasma Display Panel Driving Method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel driving method, and more particularly, to a plasma display panel driving method for improving panel characteristics of an AC plasma display panel by controlling driving pulses.

In general, a plasma display panel is a device that displays characters or graphics by using light emitted from a plasma generated during gas discharge. The plasma display panel is a direct current type or alternating current by an electric field application driving method applied externally to make a plasma. Are divided into types.

FIG. 1 illustrates a structure of a general three-electrode surface discharge plasma display panel, in which two glass substrates 12 and 13 are disposed to face each other in parallel and a first glass substrate 13 facing the second glass substrate 12. The first electrode 14 (X electrode) and the second electrode 15 (Y electrode), which are disposed in parallel with each other on the surface of the substrate and serve as the sustain electrode, and the dielectric layers 18 covering the sustain electrodes 14 and 15. In order to protect the dielectric layer 18, the MgO layer 21 covered thereon is formed on the surface of the second glass substrate 12 facing the first glass substrate 13. A third electrode 16 disposed to be substantially orthogonal to each other and used as address electrodes, a partition 17 formed in a lattice or stripe form between the two glass substrates to define each discharge cell, and The phosphor 19 is disposed on a surface on which the address electrode 16 on the second glass substrate 12 is formed. It is configured.

FIG. 2 illustrates a display device for the plasma display panel of FIG. 1, in which a plurality of X electrodes and Y electrodes are arranged in pairs in parallel with each other, and the Y electrodes are connected to the Y electrode holding driving circuit 3. Independently driven by the connected Y scan driving circuits 4-1 to 4-n, the X electrodes are connected in common and driven by the single X electrode driving circuit 5. The address electrodes 16-1 to 16-m are disposed orthogonal to the X electrodes and the Y electrodes, and the address electrodes are formed to be driven by the address driving circuit 6. Further, the individual Y scan driving circuits 4-1 to 4-n are connected to the Y electrode holding driving circuit 3, respectively, so that the scan pulses are connected to the Y scan driving circuits 4-1 to 4-n. And the sustain discharge pulses are generated by the Y electrode sustain drive circuit 3 to pass through the Y electrodes 15-1 to 15-n via the individual Y scan drive circuits 4-1 to 4-n. Is applied to. The common X electrode driving circuit 5 generates sustain pulses, which are applied in parallel to each X electrode. The drive circuits 3, 5, 6 are controlled by a control circuit (not shown), which is sequentially controlled by a synchronization signal and a display data signal applied from the outside of the apparatus. In FIG. 2, 1 represents a PDP panel, and 10 represents a cell constituting the PDP panel 10.

In the operation of driving the plasma display panel, as illustrated in FIG. 1, in the case of a three-electrode surface discharge type plasma display panel, first, a high voltage write pulse is applied to the X electrode to write the entire surface of the display panel, and then Y A front erase pulse is provided to the electrode to completely erase all the display cells, and a scan pulse is sequentially provided to the Y electrode to provide data pulses to the address electrode and to write data during the addressing period. Subsequently, the X and Y electrodes are alternately driven to perform the sustain discharge operation.

In driving the conventional plasma display panel, a constant voltage (U) is applied to the sustain electrode (X electrode) during the addressing period, that is, the data writing period, as shown in FIG. 3 as a driving method for improving dynamic margin. _xlev ) to drive.

In the driving method as described above, by applying a constant voltage (U _xlev ) corresponding to the average in one frame of the dynamic margin to equalize the dynamic characteristics of the overall panel. In this driving method, each cell having a dynamic margin below leveling causes misfiring and degrades the panel quality.

In addition, as shown in FIG. 4A, the driving voltage ranges of the n display screens (subfields) are superimposed and the center potential is set to an optimum value. And optimum drive voltage. However, as shown in the first and second screens, the optimum drive voltage value moves downward with respect to the drive voltage Va, or as shown in the n-1th display screen and the nth display screen, the optimum drive voltage value is the drive voltage Va. ) May move upward, and the variation in the internal impedance or the discharge condition may be changed by the number of light emission of the display panel or its display function.

A method for improving the problem of the method of setting the center potential of each of the overlapping driving voltage ranges as described above to an optimum value is disclosed in Japanese Patent Application Laid-Open No. 08-10661. As shown in Fig. 4B, this method varies the power supply voltage Va in accordance with the voltage correction value allocated for every n display screens, and the drive voltages for adjusting the brightness of the display screens with the variable voltages Vb1 to Vbn. The output is supplied at the center potential of the range. However, this method aims to improve the dynamic characteristic margin (write margin range) by correcting the center potential of the driving voltage range Vx which deviates from display screen to secure driving voltage range of the total display screen. However, since the dynamic margin is defined _{by the following} equation V _margin = V _x -V _y , the factor influencing the dynamic margin depends on the sustain voltage of the X and Y electrodes. Therefore, the influence of the address applied voltage applied to each subfield on the improvement of the dynamic characteristic margin is minimal. That is, the address voltage plays a role of generating wall charges in the scan / hold electrode (Y electrode), so that the influence of the dynamic characteristic margin is negligible, and sufficient operating margin is required.

Accordingly, the present invention has been made in view of the above-described conventional circumstances, and an object thereof is to provide a plasma display panel driving method for improving the range of dynamic margins.

In order to achieve the above object, a plasma display panel driving method according to a preferred embodiment of the present invention is a plasma display panel driving method in which a screen of one frame is divided and displayed by combining n subfields having different display luminance weights. To

Obtaining an optimum sustain voltage correction value for each subfield and differentially correcting the sustain electrode level Uxlev for each subfield based on the correction value.

1 is a structural diagram of a typical three-electrode surface discharge plasma display panel;

2 is a configuration diagram of a conventional plasma display device;

3 is a waveform diagram illustrating a conventional plasma display panel driving method;

4A and 4B are graphs for explaining an address voltage application method in a conventional multi-step gray scale process;

5 is a waveform diagram illustrating a plasma display panel driving method according to an exemplary embodiment of the present invention;

6A and 6B are graphs comparing the level voltages of the conventional and the present application applied to the sustain electrode in the multi-step gray scale processing.

<Description of the reference numerals for the main parts of the drawings>

Y electrode: scan / hold electrode X electrode: sustain electrode

Uysus: Holding voltage of scan / hold electrode (Y electrode)

Uylev: Reference potential of scan / hold electrode (Y electrode) in address section

Uyscan: scan voltage in address range

Uxlev: Reference potential of sustain electrode (X electrode) in address section

Uwy: Wall charge by scan voltage in scan / hold electrode (Y electrode)

Uwx: Wall charge by Uxlev in sustain electrode (X electrode)

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

FIG. 5 is a waveform diagram illustrating a method of driving a plasma display panel according to an exemplary embodiment of the present invention. FIG. 3 shows a three-electrode for splitting a screen of one frame by combining n subfields having different display luminance weights. It is set and explained as being applied to a surface discharge type plasma display panel.

An embodiment of the present invention obtains an optimum sustain voltage correction value for each subfield in advance, and differentially corrects the sustain electrode level Uxlev for each subfield based on the correction value. By constructing the module based on the sustain electrode level Uxlev, the dynamic characteristic margin is improved.

That is, after driving the scan / sustain electrode (Y electrode), a high-voltage driving pulse is provided to the sustain electrode (X electrode) to write the entire surface of the display panel. Wall charges accumulate in a cell in which discharge is caused by such a write voltage. After this front surface write, the front erase discharge pulse is gradually raised to the scan / hold electrode (Y electrode) to cause a front erase discharge. This front erase discharge erases the wall charges and leaves only the space charges. The addressing operation is then performed. During this address period, the sustain electrode (X electrode) is provided with a corrected sustain pulse based on an optimum sustain voltage correction value obtained in advance so as to provide a data pulse to the address electrode and to write data therein. Data writing is performed by providing a scan / hold pulse corrected on the basis of the optimum scan / hold voltage correction value obtained in advance to the scan / hold electrode (Y electrode). Subsequently, the sustain discharge operation is performed by alternately driving the sustain electrode (X electrode) and the scan / hold electrode (Y electrode).

Therefore, the erasing voltage range in the dynamic characteristics according to the embodiment of the present invention is expressed by the following equation (1).

<Equation 1>

Verase = Vy-Vs

= Uysus-Uylev-Uyscan-Uwy-(Uxlev + Uwx)

= Uysus-Uylev-Uyscan-Uxlev-(Uwy + Uwx)

Where Uysus is the sustain voltage of the scan / sustain electrode (Y electrode), Uylev is the reference potential of the scan / hold electrode (Y electrode) in the address section, Uyscan is the scan voltage in the address section, and Uxlev is the address The reference potential of the sustain electrode (X electrode) in the section, Uwy is the wall charge by the scan voltage at the scan / sustain electrode (Y electrode), the Uwx means the wall charge by Uxlev at the sustain electrode (X electrode). .

As compared with the conventional dynamic characteristic margin of the embodiment of the present invention operating as described above is as illustrated in FIG.

That is, FIG. 6A is a graph representing the dynamic characteristic margin according to the conventional method, and FIG. 6B is a graph representing the dynamic characteristic margin according to the embodiment of the present invention. The conventional method corrects the center potential of the driving voltage range (Uxlev in FIG. 6A). By obtaining the driving voltage range of the total display screen to obtain a predetermined dynamic characteristic margin (Vm), in the embodiment of the present invention, the reference potential Uxlev of the sustain electrode (X electrode) in the address section is differentiated for each subfield. By applying this, a wider range of dynamic characteristic margin (Vm) is obtained than in the conventional method.

According to the present invention as described above, by increasing the range of dynamic characteristics margin compared to the conventional method, by reducing the error caused by the data application of the plasma display panel, it is not only easy to adjust the voltage in the module but also improve the quality of the panel. .

On the other hand, the present invention is not limited only to the above-described embodiments, but may be modified and modified without departing from the scope of the present invention.

Claims (1)

A pair of substrates spaced apart from each other, a plurality of X electrodes and Y electrodes arranged in parallel on the one substrate, and crossing the plurality of X electrodes and Y electrodes on another substrate A plurality of pixels formed at intersections of the plurality of address electrodes arranged in a direction, the X electrodes, the Y electrodes, and the address electrodes, and a partition wall forming a discharge space between the pair of substrates to partition the plurality of pixels. In the method of driving a plasma display panel comprising a gas filled in the discharge space, Dividing an image screen of one frame into n subfields each having a differential display luminance weight, each subfield having an address period for specifying the pixels to be displayed and a sustain period for sustaining discharge of the specified pixels; Has; Obtaining an optimum holding voltage correction value for each subfield; And In the address period, scan pulses are sequentially applied to the plurality of Y electrodes, and a driving voltage is applied to the address electrodes according to the display data of the input image signal. And differentially adjusting the reference level (Uxlev) of the X electrodes every time.