KR20020064099A - Driving Method of Plasma Display Panel - Google Patents

Abstract

PURPOSE: A method of driving a plasma display panel is provided to improve a light emission efficiency and a brightness. CONSTITUTION: The plasma display panel includes a front substrate and a rear substrate which are spaced from each other by means of a partition. The first and the second sustain electrodes having plural electrodes are arranged by turns so as to be apart from with each other on a surface of the front substrate opposite to the rear substrate. Plural address electrodes are formed on a surface of the rear substrate opposite to the front substrate. When the plasma display panel having the structure as described above is driven, a scanning pulse is applied to at least two the maintaining electrodes. Preferably, the scanning pulse is applied to one electrode of the first sustain electrode and one electrode of the second sustain electrodes.

Description

Driving method of plasma display panel {Driving Method of Plasma Display Panel}

The present invention relates to a driving method of a plasma display panel having high luminous efficiency and improving luminance.

Recently, a plasma display panel (hereinafter referred to as "PDP"), which is easy to manufacture a large panel, has attracted attention as a flat panel display device. As a PDP, a three-electrode AC surface discharge type PDP having three electrodes and driven by an alternating voltage is typical.

Referring to FIG. 1, a discharge cell of a three-electrode alternating surface discharge type PDP is formed on a scan / hold electrode 12Y and a common sustain electrode 12Z formed on an upper substrate 10, and a lower substrate 18. An address electrode 20X is provided. The upper dielectric layer 14 and the passivation layer 16 are stacked on the upper substrate 10 having the scan / suspension electrode 12Y and the common sustain electrode 12Z side by side. Wall charges generated during plasma discharge are accumulated in the upper dielectric layer 14. The protective layer 16 prevents damage to the upper dielectric layer 14 due to sputtering generated during plasma discharge, and increases emission efficiency of secondary electrons. As the protective film 16, magnesium oxide (MgO) is usually used. The lower dielectric layer 22 and the partition wall 24 are formed on the lower substrate 18 on which the address electrode 20X is formed, and the phosphor 26 is coated on the surfaces of the lower dielectric layer 22 and the partition wall 24. The address electrode 20X is formed in the direction crossing the scan / sustain electrode 12Y and the common sustain electrode 12Z. The partition wall 24 is formed in parallel with the address electrode 20X to prevent ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells. The phosphor 26 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. Inert gas for gas discharge is injected into the discharge space provided between the upper and lower plates and the partition wall.

These discharge cells are arranged in the form of a matrix as shown in FIG. In FIG. 2, the discharge cells 1 are provided at the intersections of the scan / sustain electrode lines Y1 to Ym, the common sustain electrode lines Z1 to Zm, and the address electrode lines X1 to Xn. The scan / sustain electrode lines Y1 to Ym are sequentially driven, and the common sustain electrode lines Z1 to Zm are commonly driven. The address electrode lines X1 to Xn are driven by being divided into odd-numbered lines and even-numbered lines.

The three-electrode AC surface discharge type PDP is driven by being divided into a plurality of subfields, and gray scale display is performed by emitting light a number of times proportional to the weight of video data in each subfield period. For example, when an image is displayed in 256 gray scales using 8-bit video data, one frame display period (for example, 1/60 second = about 16.7 msec) in each discharge cell 1 is shown in FIG. 3. As shown in the figure, the data is divided into eight subfields SF1 to SF8. Each subfield SF1 to SF8 is further divided into a reset period, an address period and a sustain discharge period, and 1: 2: 4: 8:... The weight is given at the ratio of 128. Here, the reset period is a period for initializing the discharge cells, the address period is a period for causing selective address discharge according to the logic value of the video data, and the sustain discharge period is a period in which discharge is maintained in the discharge cells in which the address discharge has occurred. It is a period of time. The reset period and the address period are equally assigned to each subfield period.

4, a driving waveform diagram supplied to the PDP shown in FIG. 2 during an arbitrary subfield period is shown according to the conventional PDP driving method. First, all discharges are generated by supplying writing pulses to the scan / hold electrode lines Y1 to Ym and the common sustain electrode lines Z1 to Zm in a reset period (not shown) to cause discharge to occur in all discharge cells. Initialize the cells. Following the reset period, in the address period, the scan pulse SP is sequentially supplied to the scan / sustain electrode lines Y1 to Ym, and the data pulse DP synchronized with the scan pulse SP is applied to the address electrode lines. Supplying to (X1 to Xn) causes selective address discharge to occur. Subsequently, the address discharge is generated by alternately supplying the sustain pulse SUSP to the scan / sustain electrode lines Y1 to Ym and the common sustain electrode lines Z1 to Zm in the sustain discharge period. The discharge in the cells is maintained for a predetermined period of time.

However, in the conventional three-electrode PDP 30, since the sustain discharge between the scan / sustain electrodes Y1 to Ym and the common sustain electrodes Z1 to Zm that cause the sustain discharge occurs only in the center portion of the discharge cell, the space of the discharge cell is sufficient. Could not utilize Accordingly, there is a problem that the luminance of the discharge cells is lowered and the luminous efficiency is lowered. In order to solve this problem, the scan / sustain electrodes Y1 to Ym and the common sustain electrodes Z1 to Zm, which cause sustain discharges, are provided at both boundaries of the discharge cells, or the widths of the discharge electrodes are widened. However, when the distance between the scan / sustain electrodes Y1 to Ym and the common sustain electrodes Z1 to Zm increases, the discharge voltage becomes high, and when the width of the discharge electrode is widened, the discharge current increases and the power consumption increases.

In order to solve this disadvantage, as shown in FIG. 5, a PDP having four sustain electrodes on the first substrate is designed.

5 is a plan view illustrating a conventional panel structure in which four sustain electrodes are formed on a first substrate.

The PDP includes a pair of sustain electrode lines, a first sustain electrode group S'y and Sy, and a second sustain electrode group S'z and Sz. The PDP of FIG. 5 includes address electrode lines A1, A2, A3,..., Am-1, Am arranged to intersect the electrodes S'y, Sy, S'z, and Sz. The discharge cells 11 are formed at the intersections of the sustain electrode line groups S'y, Sy, S'z, and Sz and the address electrode lines A1, A2, A3, ..., Am-1, Am. In addition, the PDP 40 of FIG. 5 provides an independent discharge space for each of the discharge cells 11 to eliminate optical interference between the discharge cells 11, and thus address electrode lines A1, A2, A3,. 1, Am) will be further provided with a partition wall 36.

In the PDP 40, an address discharge is generated between the sustain electrode line groups S'y, Sy, S'z, and Sz and the address electrode lines A1, A2, A3, ..., Am-1, Am. In the cells 11, the inner electrodes Sy in the first sustaining electrode groups S'y and Sy are relatively close to each other and the inner electrodes Sz in the second sustaining electrode groups S'z and Sz. Primary sustain discharge occurs. Subsequently, the secondary sustain discharge is caused by the group of sustain electrode lines S'y and S'z relatively far apart using the priming effect by the primary sustain discharge. Such sustain discharges occur continuously for a predetermined sustain discharge period. As a result, the discharge distance is increased and a lot of ultraviolet rays are generated, thereby increasing the brightness and efficiency.

Referring to FIG. 6, a driving waveform diagram supplied to the PDP shown in FIG. 5 during an arbitrary subfield period is shown according to the conventional PDP driving method.

First, in the reset period, all of the discharge cells 11 are initialized by supplying a writing pulse to the inner electrodes Sz of the second sustain electrode groups S'z and Sz to cause discharge in all the discharge cells 11. Done. Following the reset period RPD, in the address period APD, the scan pulse SP is sequentially supplied to the inner electrodes Sy of the first sustain electrode groups S'y and Sy, and the scan pulse SP is applied. By supplying the data pulses DP synchronized with each other to the address electrode lines A1, A2, A3, Am-1, Am, selective address discharge is caused. That is, during the address period APD, the scanning pulse SP is applied to the inner electrode Sy in the first sustain electrode group S'y and Sy, and the first sustain electrode group S 'in the address period APD. The inner electrode Sy and the second sustain electrode group S'z and the second sustain electrode group S'y and Sy in the first sustain electrode group S'y and Sy at the time of sustain discharge due to wall charges accumulated on the surface of the inner electrode Sy in y and Sy The discharge is primarily generated between the inner electrodes Sz in Sz, and the outer electrodes S'y and the second in the first sustaining electrode groups S'y and Sy are caused by the priming effect by the primary discharge. A sustain discharge is caused between the outer electrodes S'z in the sustain electrode groups S'z and Sz. Subsequently, the sustain pulse SUP is alternately supplied to the first sustain electrode group S'y and Sy and the second sustain electrode group S'z and Sz in the sustain discharge period SDPD. In the discharge cells 11 in which the address discharge has occurred, the discharge is maintained for a predetermined period.

However, since the wall charges are accumulated only on the inner electrodes Sy in the first sustaining electrode groups S'y and Sy during the address period APD, the discharge is mainly performed in the first sustaining electrode groups S'y and Sy. It occurs between the inner electrode Sy and the inner electrode Sz in the second sustaining electrode groups S'z and Sz, and the outer electrode S'y and the second in the first sustaining electrode groups S'y and Sy. Difficulties arise in causing long path discharge between the outer electrodes S'z in the sustain electrode groups S'z and Sz.

Accordingly, it is an object of the present invention to provide a method of driving a plasma display panel which improves luminous efficiency and improves luminance.

1 is a perspective view showing a discharge cell structure of a conventional three-electrode AC surface discharge plasma display panel.

FIG. 2 is an electrode arrangement diagram of the plasma display panel shown in FIG. 1. FIG.

3 is a frame diagram illustrating a method of driving a subfield of a discharge cell shown in FIG. 1.

4 is a driving waveform diagram of the discharge cell shown in FIG.

5 is a plan view showing a conventional panel structure in which four sustain electrodes are formed on a first substrate.

Fig. 6 is a drive waveform diagram supplied to the PDP shown in Fig. 5 for an arbitrary subfield period according to the conventional PDP driving method.

Fig. 7 is a drive waveform diagram supplied to the PDP shown in Fig. 5 during any subfield period in accordance with the PDP driving method of the present invention.

Fig. 8 is a drive waveform diagram supplied to the PDP shown in Fig. 5 during an arbitrary subfield period in accordance with the PDP driving method according to the first embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

10: upper substrate 12Y, Ys: scanning / holding electrode

12Z: common holding electrode 14: upper dielectric layer

16: protective film 18: lower substrate

20X, A1, A2, A3, Am-1, Am: address electrode 22: lower dielectric layer

24, 36: bulkhead 26: phosphor

1,11: discharge cell 30,40: PDP

S'y: outer electrode of the first sustaining electrode group Sy: inner electrode of the first sustaining electrode group

S'z: outer electrode of the second sustaining electrode group Sz: inner electrode of the second sustaining electrode group

In order to achieve the above object, the driving method of the plasma display panel according to the present invention includes a front substrate and a rear substrate coupled to maintain a predetermined interval by the partition wall, and a plurality of electrodes on the opposite surface of the rear substrate of the front substrate, respectively; A method of driving a plasma display panel comprising first and second sustain electrode groups alternately arranged with each other, and an address electrode group formed on an opposite surface of a front substrate of a rear substrate, the method comprising: scanning at least two sustain electrodes; It is characterized by applying a pulse.

Other objects and features of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 7 and 8.

Referring to FIG. 7, a driving waveform diagram supplied to the PDP shown in FIG. 5 during an arbitrary subfield period is shown in accordance with the PDP driving method of the present invention.

First, all the discharges are generated by supplying the writing pulse RP to the inner electrode Sz of the second sustaining electrode groups S'z and Sz in the reset period RPD to generate discharge in all the discharge cells 11. The cells 11 are initialized. Following the reset period RPD, in the address period APD, the inner electrode Sy in the first sustaining electrode group S'y and Sy and the outer electrode S in the second sustaining electrode group S'z and Sz. The scan pulse SP is sequentially supplied to 'z' and the data pulse DP synchronized with the scan pulse SP is transferred to the address electrode lines A1, A2, A3, ..., Am-1, Am. Supply causes selective address discharge to occur. That is, in the address period APD, the scan pulse SP is applied to the inner electrode Sy in the first sustain electrode group S'y and Sy and the outer electrode S in the second sustain electrode group S'z and Sz. 'z', and the inner electrode Sy in the first sustaining electrode group S'y and Sy and the outer electrode S 'in the second sustaining electrode group S'z and Sz during the address period APD. On z) wall charges are formed.

During sustain discharge, the wall charges accumulated on the surface of the inner electrode Sy in the first sustain electrode group S'y and Sy and the outer electrode S'z in the second sustain electrode group S'z and Sz The first sustain electrode group S 'between the inner electrode Sy of the first sustain electrode group S'y and Sy and the inner electrode Sz of the second sustain electrode group S'z and Sz during the sustain discharge. Inner electrode Sy in y, Sy, outer electrode S'y in first sustain electrode group S'y, Sy, and inner electrode Sz in second sustain electrode group S'z, Sz. ) Is discharged primarily between the outer electrodes S'z in the second sustaining electrode groups S'z and Sz, and the first sustaining electrode group S'y is caused by the priming effect of the first discharge. And the long pass discharge is generated between the outer electrode S'y in the surface of Sy, and the outer electrode S'z in the second sustaining electrode group S'z, Sz, thereby increasing the luminous efficiency. The address is alternately supplied to the first sustain electrode group S'y and Sy and the second sustain electrode group S'z and Sz during the sustain discharge period SDPD. In the discharge cells 11 in which discharge has occurred, the discharge is maintained for a predetermined period of time.

In addition, due to the primary discharge between the respective electrodes, the light emitting area of the phosphor can also be emitted in a wider area than in the prior art, thereby achieving high luminance.

Referring to Fig. 8, there is shown a driving waveform diagram supplied to the PDP shown in Fig. 5 during an arbitrary subfield period according to the PDP driving method according to the first embodiment of the present invention.

First, in the reset period APD, the writing pulse RP is supplied to the inner electrodes Sz in the second sustaining electrode groups S'z and Sz to cause discharge to occur in all the discharge cells 11. The cells 11 are initialized. Following the reset period RPD, in the address period APD, the outer electrode S'y in the first sustain electrode group S'y and Sy and the outer electrode in the second sustain electrode group S'z and Sz are provided. The scan pulse SP is sequentially supplied to S'z, and the data pulse DP synchronized with the scan pulse SP is transferred to the address electrode lines A1, A2, A3, Am-1, Am. Supply causes selective address discharge to occur. That is, in the address period APD, the scan pulse SP is applied to the outer electrode S'y in the first sustain electrode group S'y and Sy and the outer electrode in the second sustain electrode group S'z and Sz. Applied to (S'z), the outer electrode (S'y) of the first sustain electrode group (S'y, Sy) and the outer side of the second sustain electrode group (S'z, Sz) in the address period (APD). Wall charges are formed on the electrode S'z.

During the sustain discharge, a wall accumulated on the surface of the outer electrode S'y in the first sustain electrode group S'y and Sy and the outer electrode S'z in the second sustain electrode group S'z and Sz. Due to electric charge, between the inner electrode Sy in the first sustain electrode group S'y and Sy and the outer electrode S'y in the first sustain electrode group S'y and Sy during the sustain discharge period SDPD. Then, a discharge is generated between the inner electrode Sz in the second sustain electrode group and the outer electrode S'z in the second sustain electrode groups S'z and Sz. The address is alternately supplied to the first sustain electrode group S'y and Sy and the second sustain electrode group S'z and Sz during the sustain discharge period SDPD. In the discharge cells 11 in which discharge has occurred, the discharge is maintained for a predetermined period of time.

This makes it possible to achieve luminance improvement by increasing the light emitting area of the phosphor.

As described above, the driving method of the PDP according to the present invention can achieve the improvement of efficiency by long-pass discharge by applying the scanning pulse to at least two or more of the sustain electrodes, and the light emitting of the phosphor in a wide area is possible. The luminance improvement can be achieved.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (6)

A front substrate and a rear substrate coupled to each other at a predetermined interval by a partition wall, and a first and second sustain electrode groups each having a plurality of electrodes on opposite sides of the rear substrate of the front substrate and alternately arranged with each other; In the driving method of the plasma display panel having an address electrode group formed on the front substrate opposing surface of the rear substrate, And a scanning pulse is applied to at least two sustain electrodes. The method of claim 1, And a scanning pulse is applied to one of the plurality of first sustaining electrode groups and one of the plurality of second sustaining electrode groups. The method of claim 1, And the scanning pulses are simultaneously supplied to the at least two sustain electrodes. The method of claim 1, The first sustain electrode group includes inner and outer sustain electrodes adjacent to each other side by side, And the second sustain electrode group includes an inner electrode disposed close to the inner electrode of the first sustain electrode group and an outer electrode adjacent to the inner electrode. The method of claim 4, wherein The scanning pulse is applied to the outer electrode of the first sustaining electrode group and the inner electrode of the second sustaining electrode group or to the inner electrode of the first sustaining electrode group and the second sustaining electrode group so as to be applied to each electrode over one electrode. A method of driving a plasma display panel, which is supplied to an outer electrode. The method of claim 4, wherein And the scanning pulses are applied to an outer electrode of the first sustaining electrode group and an outer electrode of the second sustaining electrode group.