KR20030089237A - Driving method for fast addressing technique in an ac-pdp - Google Patents

Abstract

PURPOSE: A method for driving an AC type plasma display panel to perform a high-speed write operation is provided to improve the luminance and the picture quality by using two scan pulses during a write period to be divided into a discharge start block and a wall charge storage block. CONSTITUTION: A method for driving an AC type plasma display panel to perform a high-speed write operation includes a write discharge start process and a wall charge storage process. The write discharge start process is to apply a scan pulse for starting the discharge to a scan electrode according to picture data and start the discharge by applying a write pulse to a write electrode during the applying period of the scan pulse. The wall charge storage process is to apply the scan pulse for storing wall charges having the polarity opposite to the scan pulse for starting the discharge. The scan pulse for storing the wall charges has the lower voltage than the voltage of the scan pulse for starting the discharge.

Description

Driving method for high-speed writing of AC plasma display panel {DRIVING METHOD FOR FAST ADDRESSING TECHNIQUE IN AN AC-PDP}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of driving an alternating plasma display panel (PDP), and more particularly, to apply a discharge start pulse and a wall charge accumulation pulse to a scan electrode in a write period of an alternating current plasma display panel. And applying a write pulse having a section overlapping with the above discharge start pulse to the write electrode to significantly reduce the width of the write pulse required for the write operation, thereby enabling a high-speed write to the entire panel. It is about.

FIG. 1A is a perspective view of the upper and lower plates of a typical AC surface discharge PDP separated and FIG. 1B is a plan view thereof. Referring to each of the drawings, the AC type surface discharge PDP includes a front substrate 1 displaying information and a rear substrate 2 positioned in parallel with the same width as the front substrate 1.

The front substrate 1 is composed of a transparent electrode 6 and a bus electrode 7 having a low resistivity formed between a plurality of sustain electrode lines X and Y for applying a voltage waveform and a sustain electrode line to discharge current. It consists of a restricting dielectric layer 8 and a protective layer 9 formed over the dielectric layer 8 to protect the sustain electrode lines. The back substrate 2 includes a plurality of partition walls 3 forming a discharge space, a plurality of write electrode lines 4 formed so as to be orthogonal to the sustain electrode lines between the partition walls 3, and each discharge space has both sides of an inner surface thereof. It is formed to surround the write electrode line 4 on the barrier rib surface and the back substrate surface, and is composed of a fluorescent film 5 which receives the vacuum ultraviolet (VUV) generated during discharge and emits visible light.

FIG. 2A is an overall driving waveform diagram showing waveforms applied to the electrodes X, Y, and Z during one subfield in a conventional AC PDP. FIG. 2B is a diagram illustrating an initialization section and a writing section. It is an enlarged waveform diagram for the time period when the sustain pulse is applied, and FIG. 2C is a diagram showing the behavior of the discharge and the wall charge generated inside the discharge cell during each section divided in the enlarged waveform diagram of FIG. 2B.

Referring to each of the drawings in detail, FIG. 2A shows sustain electrode lines X and Y and write electrode lines composed of the transparent electrode 6 and the bus electrode 7 of FIG. 1 in order to display information on an AC PDP. An example of the voltage waveform applied to 4) is shown. In terms of time, it can be divided into an initialization section, a writing section, and a sustain section. In the initialization section, a narrow pulse and a wide pulse having a low voltage while having the same voltage as the sustain pulse are applied to the sustain electrode lines X and Y alternately as shown in FIG. During the display, the non-uniform wall charge state is made uniform throughout the panel, and in the write section, only the cells to be displayed as the voltage difference between X, which is one sustain electrode line and scan electrode, and Z, which is a write electrode line, are discharged. Thereafter, writing is performed by stacking wall charges, and in the sustaining period, information is displayed by emitting voltages alternately applied to both sustain electrode lines X and Y to emit visible light only in the cell written in the writing period.

The state inside the discharge space during each process will be described with reference to FIGS. 2B and 2C. T11 is a period representing the state inside the discharge space after the initialization pulse applied to each electrode during the previous initialization period. Thereafter, little wall charges exist in the discharge space, or a uniform amount of wall charges is provided throughout the panel. T12 is a period in which a write discharge occurs due to a voltage difference between the scan electrode Y and the write electrode Z. The voltage is applied to the lower side of the scan electrode Y and the write electrode Z at the same time the write discharge is started. As the charge of the opposite polarity begins to accumulate, the intensity of the electric field applied to the inside of the discharge space is actually decreased, thereby dissipating the discharge. T13 is a section for converting the wall charges into wall charges using the electric field generated by the voltage difference between the scan electrode Y and the write electrode Z. It is accumulated under the Y) and the writing electrode Z. T14 is a period indicating the state inside the discharge space after the previous write discharge and the wall charge accumulation step. The wall charge accumulated after the voltage applied to each electrode to generate the write discharge disappears to maintain the accumulated state under each electrode. do. T15 is a section in which a sustain discharge is generated by applying a sustain pulse through the sustain electrode X. When a voltage having the same polarity as the accumulated wall charge is applied between the two sustain electrodes X and Y, the wall by the wall charge As the sum of the voltages is actually applied to the discharge space, a sustain discharge is generated, and charges of a polarity opposite to the applied voltage begin to accumulate, and the intensity of the electric field applied to the inside of the discharge space decreases, thereby dissipating the discharge. T16 is a period for converting into wall charges using the electric field generated by the voltage difference between the two sustain electrodes (X, Y). Accumulated under Y). T17 is a section indicating the state inside the discharge space after the previous sustain discharge and wall charge accumulation step. The wall charge accumulated after the voltage applied to each electrode to generate the sustain discharge disappears to maintain the state accumulated under each electrode. It is used for the next maintenance discharge.

Since wall charges accumulated during T13 in FIG. 2B are due to the electric field generated by the voltage difference between the scan electrode Y and the write electrode Z, they are mainly accumulated below the scan electrode Y and the write electrode Z. Since the sustain discharge generated at T15 is caused by the voltage difference between the two sustain electrodes X and Y, the wall charge accumulated under the write electrode Z during T13 does not contribute to the sustain discharge of T15, and the first sustain discharge is Since there is a problem that is weaker than the sustain discharge afterwards, several methods for improving this have been proposed.

On the other hand, the width of the pulse applied to the scan electrode (Y) and the writing electrode (Z) during the T12 and T13 of Fig. 2b is necessary to accumulate the wall charge sufficient to generate a stable discharge in the sustain period after the write period, For a corresponding amount of wall charge accumulation, a pulse width of about 3 ms or more is required. In addition, since the writing process in the writing period is performed by using the discharge generated by the application of the writing pulse through the writing electrode Z to the scan line designated by the application of the scanning pulse to the scanning electrode Y, the writing pulse Cannot write multiple scan lines at the same time, and the time required to write one scan line is more than 3 ms. As a result, the time taken to write the entire panel in one sub-screen is the product of the horizontal resolution of the panel and the time taken to write one scan line. Thus, for example, in case of PDP having VGA resolution (640 × 480), 480 × 3 ms = 1.44 ms.

FIG. 3A is a view showing waveforms applied for one TV field (16.67 별로) for each section during a conventional PDP driving, and FIG. 3B is a view showing time required for each section for one TV field. It is composed of three sub-screens, and each sub-screen is designated to have 1, 2, 4, 8, 16, 32, 64, and 128 brightness, respectively, to obtain a total of 256 brightness from 0 to 255 through the combination of several sub-screens. do. In addition, each sub-screen is composed of an initialization section, a writing section, and a sustain section. When driving a PDP with a general VGA resolution, the time required for the initialization section in one sub-screen is about 300 ms and the time required for the writing section. Is about 1.44㎳, and the time required for the holding section is about 10㎲ ~ 1.28㎳ depending on the designated brightness. Therefore, as shown in FIG. 3B, the initialization section occupies 14%, the writing section 69%, and the holding section 17% in one TV field, and the light emitting section is very short compared to the total time. The short emission time greatly influences the decrease in luminance of the PDP. When driving an XGA-class resolution (1024 × 768) PDP that can support HDTV, the time required for the initialization section in one sub-screen is about 300㎲, and the time required for the write section is 768 × 3㎲ = 2.304㎳. The sum of the initialization section and the writing section in one TV field is 20.382 ms, which exceeds 16.67 ms, which is one TV field time. In addition, in order to compensate for various image quality problems generated in general PDPs, the number of sub-pictures other than 8 sub-screens is frequently used within one TV field. In this case, the emission period is further reduced. In order to solve these problems, the time required for writing in the fast writing process must be reduced. Therefore, various methods for high speed writing of such an AC PDP have been proposed.

Proposed methods for high-speed writing of AC-type PDPs include a driving method for performing write discharge in a sustain period, a method of separating the writing electrodes of the PDP up and down, a driving method using a priming effect, a multi-block scan method, and the like. Can be mentioned. The driving method for performing the write discharge in the sustain period has no time separation between the initialization period and the write period and the sustain period, and when the write process is performed in the designated scan line, the sustain discharge is performed in the remaining lines so as to generate the light emission period in the entire period. That's up to 90%. However, this method has a problem in that driving becomes very unstable because the application pulse is applied to the writing electrodes lying over several lines when the sustain discharge is generated in the other lines. The method of separating the writing electrodes of the PDP up and down physically divides the writing electrodes and writes one upper line and one lower line at the same time, thereby reducing the time required in the writing section by half, but this method is doubled. Has a disadvantage of requiring a write circuit. The method using the priming effect is a method of generating a strong discharge in advance before the writing process to generate metastable particles in the discharge space to reduce the occurrence of fast discharge and the width of the write waveform in the writing process. The problem with this method is that the unnecessary light emission occurs in the strong discharge to produce the metastable particles, so that the color contrast ratio decreases, and the metastable particles decrease in amount over time, so the upper line and the lower line The tendency of the write discharge at is different. The multi-block scan method divides the PDP panel into several blocks up and down, and separates the initialization section, the writing section, and the sustain section in one block, but the blocks are initialized in another block while sustain discharge is performed in one block. And a method for performing the writing process, which also causes a problem that driving becomes very unstable because the application pulse is applied to the writing electrodes lying over several lines when sustain discharge is generated in other lines.

Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art, and by dividing the discharge start section and the wall charge accumulation section using a double voltage scan pulse, the designated scan line occupies the write electrode. By minimizing the time and reducing the time required to write the entire panel, the luminous time in the 1 TV field is increased to improve the brightness of the AC plasma display, and it is possible to stably drive the PGA of XGA resolution without changing the structure. In addition, the present invention provides a driving method for compensating for the luminance lowered as the emission time decreases even when the number of sub-screens is increased to improve the image quality.

More specifically, the present invention is a waveform applied to the scan electrode of the line in which the scan is performed in the write interval, the narrow discharge start pulse and the discharge start pulse than the conventional single pulse waveform, not the waveform of the conventional single pulse type It has a voltage level of opposite polarity with respect to, and continuously applies a wide wall charge accumulation pulse compared to the discharge start pulse, and the write electrode has a section overlapping with the narrow discharge start pulse among the above scan pulses to generate the write discharge. A drive waveform for simultaneously applying a write pulse is proposed. By using such a waveform, it is possible to reduce the writing time required for the designated scan line to the same time as the width of the narrow discharge start pulse, thereby greatly reducing the writing period of the entire panel, thereby enabling high-speed writing. Since the ratio of time occupied by the sustain section in the field can be relatively increased, luminance compensation during sub-screen division for increasing the overall luminance of the panel and improving image quality is possible.

The present invention according to one aspect for achieving the above object,

During the writing period for writing image data into an AC plasma display panel having a plurality of discharge cells for realizing an image, and having a plurality of scan electrodes Y and a writing electrode Z for controlling the discharge cells. Driving method,

For the first scan line,

a) Start of write discharge in which a discharge start scan pulse is applied to a scan electrode according to the image data, and a write pulse having a voltage opposite to that of the scan pulse is applied to a write electrode to initiate a discharge while the scan pulse is applied. step; And

b) a wall charge accumulation step of applying a wall charge accumulation scan pulse having a polarity opposite to that of the discharge initiation scan pulse and having an adjustable voltage magnitude and width according to the amount of wall charge to be accumulated.

Preferably, the wall charge accumulation scan pulse has a lower voltage than the discharge start scan pulse.

The wall charge accumulation scan pulse may be applied after a pause for a predetermined period after the application of the discharge start scan pulse.

The driving method may further include maintaining a constant voltage on the common sustain electrode X during a portion of the writing period.

The driving method may further include generating a front surface write discharge to lower a required voltage of pulses applied to each electrode in the write period during the initialization period before the write period.

The discharge start scan pulse may be a pulse having a positive voltage with respect to a reference potential.

On the other hand, the discharge start scan pulse may be configured to be a pulse having a negative voltage with respect to the reference potential.

The driving method,

About the second scan line

c) Initiation of discharge discharge in which a discharge start scan pulse is applied to a scan electrode according to the image data, and a write pulse having a voltage opposite to that of the scan pulse is applied to a write electrode to initiate a discharge while the scan pulse is applied. step; And

d) a wall charge accumulation step of applying a wall charge accumulation scan pulse of opposite polarity to the discharge initiation scan pulse and having a voltage size and width that is adjustable according to the amount of wall charges to be accumulated; Can,

In this case, in order to shorten the total writing time for the first and second scan lines, the discharge start scan pulse for the second scan line is immediately after the discharge start scan pulse for the first scan line is finished. It is preferable to apply to.

In addition, the application period of the discharge start scan pulse to the second scan line preferably has a section overlapping the application period of the scan pulse for wall charge accumulation to the first scan line.

1A is a perspective view showing the structure of a conventional AC type surface discharge PDP.

Fig. 1B is a plan view showing the structure of a conventional general AC type surface discharge PDP.

2A shows an example of a driving waveform diagram applied to each electrode when driving a conventional general AC PDP.

2B is an enlarged waveform diagram of an initialization section, a writing section, and a sustain section in a driving waveform diagram applied to each electrode when a conventional AC PDP is driven.

FIG. 2C is a view illustrating the movement of the discharge and the wall charge in the discharge space with respect to the time between the initialization section, the writing section, and the application of one sustaining pulse when the conventional AC PDP is driven.

3A illustrates a temporal configuration of a sub screen applied to display one TV screen in a conventional AC PDP.

3B shows the temporal occupancy ratio of each section in one sub-screen of a conventional AC PDP.

Figure 4 shows the temporal change of voltage, current, and IR with respect to one write discharge when driving a conventional general AC PDP.

Fig. 5 shows waveforms applied to each electrode in the conventional general AC PDP during write discharge, and waveforms applied to each electrode according to the present invention.

6A illustrates an example of a driving waveform diagram applied to each electrode when driving an AC PDP according to the present invention.

6B is an enlarged waveform diagram of an initialization section, a writing section, and a sustain section in a driving waveform diagram applied to each electrode when the AC PDP is driven according to the present invention.

FIG. 6C is a view showing the movement of the discharge and the wall charge in the discharge space with respect to the time between the initialization section and the writing section and one sustain pulse applied when the AC PDP is driven according to the present invention.

FIG. 7A is a diagram illustrating the effect of write discharge on adjacent scan lines in a cell in which a write discharge has occurred in the write period of an AC PDP according to the present invention as a movement of discharge and wall charge.

FIG. 7B is a diagram showing the effect of the write discharge on the adjacent scan line in the cells in which the write discharge did not occur earlier in the write interval of the AC PDP in terms of discharge and wall charge.

8A illustrates a temporal configuration of a sub-screen applied to display one TV screen in the AC PDP according to the present invention.

8B shows the temporal occupancy ratio of each section in one sub-screen of the AC PDP according to the present invention.

9A, 9B, 9C, and 9D are waveform diagrams illustrating waveforms that may be variously modified on each electrode in order to perform a high-speed writing process of an AC PDP according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1: Front board 2: Back board

3: partition wall 4: write electrode

5: fluorescent film 6: transparent electrode

7 bus electrode 8 dielectric layer

9: protective layer

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are denoted by the same reference numerals as much as possible even if displayed on the other drawings.

FIG. 4 is a waveform diagram illustrating temporal changes of voltage, current, and infrared ray (IR) in one write discharge generated by a scan pulse and a write pulse during a general write process. In Fig. 4, since the infrared rays are generated on the same reaction path as the vacuum ultraviolet rays (VUV) generated during the discharge, it is possible to track the temporal change of the vacuum ultraviolet rays (VUV). ) Is a structural feature of the PDP in which each electrode is covered with a dielectric, and after the displacement current corresponding to the charging flows, the write discharge occurs due to the voltage difference between the scan pulse and the write pulse, and the discharge current flows, IR) is emitted. After the address discharge, the discharge is rapidly extinguished by the wall charges accumulated in each electrode, and the space charges existing in the discharge space after the discharge is extinguished by the voltage difference continuously applied during the T23 period are converted into wall charges. do. In the lower portion of the scan pulse and the write pulse, the displacement current generated by the structural characteristics of the PDP again flows. When the introduction step, the discharge generation step, and the voltage holding step, in which the voltage is applied to each of the above-described electrodes, are separated in time, they are 0.3 kV, 0.6 kV and 3 kV respectively.

Fig. 5 shows waveforms applied to each electrode in the conventional general AC PDP during write discharge, and waveforms applied to each electrode according to the present invention. In the conventional general AC PDP, the waveform applied to each electrode during the write discharge is performed in the same process as the discharge and the wall charge accumulation as described above with reference to FIG. The width is usually over 0.3㎲. According to the present invention, as shown in FIG. 5 (b), a double pulse having different voltages and polarities is applied to the scan pulses applied to the scan electrodes of the specified line so as to perform discharge and wall charge accumulation separately. It is possible to reduce the occupancy time of the write electrode to a minimum and to reduce the time required for the writing section of the panel. Referring to FIG. 5, as described above with reference to FIG. 4, a narrow scan pulse is applied through the scan electrode for 0.6 ms, which is a time until discharge is generated and disappears, and at the same time, the opposite polarity of the scan pulse is applied to the write electrode. When a pulse having a voltage having a voltage that satisfies a condition in which the voltage difference between the scan electrode and the write electrode starts to discharge is applied, a write discharge is generated, and the space charge generated in the discharge begins to accumulate under each electrode. The discharge disappears rapidly. Subsequently, if a pulse is applied for a period of about 3 μs with the opposite polarity of the pulse applied to the scan electrode, reverse discharge may be generated at a low voltage by using space charge or excited particles generated by the write discharge. As a result, the space charges generated in this discharge are converted into wall charges and accumulated to form a complete writing process. In this case, the width of the write pulse applied to the write electrode is about 0.6 [mu] s, which is a condition for generating a write discharge by the sum of the scan pulses, and it is not necessary to apply it in the wall charge accumulation process. As it can be used for the writing process of the, the occupancy time for the writing electrode in one scan line is reduced from 3 ms to 0.6 ms and the time taken to write the entire panel is about 1/5 compared with the conventional technique. Can be reduced to

FIG. 6A is a schematic diagram illustrating waveforms applied to each electrode X, Y, and Z during one subfield in an AC PDP in a preferred embodiment of a driving method for performing a fast writing process of the present invention. 6B is an enlarged waveform diagram for a time period during which an initialization section, a writing section, and one sustain pulse are applied according to the present invention, and FIG. 6C is a discharge cell for each section divided in the enlarged waveform diagram of FIG. 6B. A diagram showing the behavior of discharges and wall charges generated inside.

6A, 6B, and 6C, T31 is a section representing a state inside the discharge space after the initialization pulse applied to each electrode during the preceding initialization section, and almost all wall charges exist in the discharge space after the initialization section. Or have a uniform amount of wall charge throughout the panel. T32 is a section in which a write discharge occurs due to a voltage difference between the scan electrode Y and the write electrode Z. A scan having a width of about 0.6 mW, which is a time when the write discharge is generated and disappears in the scan electrode Y, is detected. When a pulse is applied and a pulse of the same width is applied to the write electrode having the same polarity as that of the scan pulse and the voltage difference satisfies the condition for starting the discharge, the write discharge occurs and the discharge starts. As the charges of the opposite polarity start to accumulate with the voltages applied to the lower portions of the scan electrodes Y and the write electrodes Z, the intensity of the electric field applied to the inside of the discharge space decreases, thereby dissipating the discharge. T33 is a period in which a reverse polarity is generated by applying a pulse of opposite polarity to the pulse applied to the scan electrode Y. When a pulse is applied for about 3 ms, the space charge generated by the address discharge or the excited state is The particles can be used to generate a reverse discharge at a low voltage between the two sustain electrodes X and Y. As the discharge starts and the wall charge starts to accumulate, the discharge disappears. T34 is a section in which wall charges are accumulated by using an electric field generated by a voltage difference between two sustain electrodes (X, Y). Accumulate below X, Y). T35 is a period indicating the state inside the discharge space after the previous write discharge and the wall charge accumulation step, and the wall charge accumulated after the voltage applied to each electrode disappears is maintained under the electrode. T36 is a period in which sustain discharge is generated by applying a sustain pulse through the sustain electrode Y. When a voltage having the same polarity as the accumulated wall charge is applied between the two sustain electrodes X and Y, sustain discharge occurs. As the charge of the opposite polarity to the applied voltage begins to accumulate, the discharge disappears. T37 is a section for converting into wall charges using the electric field generated by the voltage difference between the two sustain electrodes (X, Y). Accumulated under Y). T38 represents the state inside the discharge space after the previous sustain discharge and the wall charge accumulation step. The wall charge accumulated after the voltage applied to each electrode to generate the sustain discharge disappears is maintained under the electrode. It is used for the next sustain discharge.

In this case, the time required to write one scan line is enough to be 0.6 s, which is a condition for generating a write discharge in T32 of FIG. 6B, so that the write electrode can be used to write the next scan line. As a result, the time required for writing in one subscreen can be greatly reduced. As a result, the time required for writing the entire panel in one subscreen is 480 × 0.6 in the case of a PDP having VGA resolution (640 × 480). ㎲ + 3 ㎲ = 0.291 ㎳.

7A and 7B are diagrams illustrating the effect of the write discharge on the adjacent scan line during the write period of the AC PDP in terms of discharge and wall charge, according to the present invention. 7A is a schematic diagram showing the effect of write discharge on adjacent scan lines in a cell where a write discharge has occurred previously. When a write discharge occurs in the first scan line Line1 at T41 and a reverse discharge occurs in the first scan line Line1 and a write discharge occurs in the second scan line Line2 at T42, the scan line designated during T41 is Since the maximum difference of voltages applied to each electrode in the second scan line Line2 is VA, there is no problem of misdischarge, and the maximum difference of voltages applied in the first scan line Line1 other than the designated scan line during T42 is As VO, the reverse discharge generated between the two sustain electrodes X and Y of the first scan line Line1 is not significantly affected by the voltage applied to the write electrode Z, thereby generating stable discharge. FIG. 7B is a schematic diagram showing the effect of write discharge of adjacent scan lines in a cell in which no write discharge has occurred previously. In FIG. 7B, when write discharge has not occurred in the first scan line Line1 in T51, FIG. When a write discharge occurs in Line2, the maximum difference of voltages applied from the first scan line Line1, not the designated scan line, becomes VO-VA, so that no problem of false discharge occurs.

FIG. 8A is a diagram showing waveforms applied for one TV field (16.67㎳) for each section when driving a PDP according to the present invention. FIG. 8B is a diagram showing the time required for each section for one TV field. When driving a PDP with VGA resolution using 8 sub-screens, the time required for the initialization section in one sub-screen is about 0.3㎳, the time required for the write section is about 0.291㎳, The time ranges from 47㎲ to 5.99㎳ depending on the brightness specified. Therefore, as shown in FIG. 8B, the initialization section occupies 14%, the writing section 14%, and the holding section 72% in one TV field, which is required for the writing section as compared with the conventional PDP driving method. The time is reduced to 1/5, and the time allocated to the sustaining interval is increased by four times or more, which can greatly contribute to increasing the brightness of the PDP. Especially, when driving PDPs with XGA-class resolution (1024 × 768) that can support HDTV, the time required for the initialization section in one sub-screen is about 300 약, and the time required for the write-in section is 768 × 0.6㎲ + 3 ㎲ = 0.291 ms, so that the sum of the initialization section and the writing section in one TV field is 6.11 ms, and more than 10 ms can be allocated to the light emitting section at 16.67 ms, which is one TV field time, so that driving is sufficiently possible. In addition, in order to compensate for various image quality problems caused in general PDP, even when 12 sub-screens are used in one TV field, it is possible to have a holding interval of 9.5 Hz or more, thereby ensuring stable luminance. Do.

9A, 9B, 9C, and 9D illustrate a driving method for performing a high-speed writing process of an AC-type PDP according to the present invention, which is derived from the same technical idea as the above-described embodiment and applied to a scan electrode and a writing electrode. FIG. Is a diagram illustrating an embodiment through various modifications. 9A shows that even in the initialization process prior to the writing process, even wall charges are uniformly accumulated or particles are excited to reduce the magnitude of the voltage required to be applied to each electrode in order to start writing discharge during the writing process. A modified embodiment, including generating a full surface write discharge for release. FIG. 9B is a view showing a modified embodiment configured to have a short period of rest after application of the discharge start scan pulse and application of the wall charge accumulation scan pulse to prevent erroneous discharge caused by a sudden voltage change of the scan pulse; to be. FIG. 9C is a diagram showing that even if the polarity of the scan pulse and the write pulse can be changed, it can be appropriately modified to cause the same action as the above embodiment. FIG. 9D is a view illustrating another modified embodiment including the step of maintaining a voltage having a constant magnitude other than the reference potential in the common sustain electrode X during the writing process.

As described above, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

According to the present invention, by dividing the discharge start period and the wall charge accumulation period by using two scan pulses during the writing period, the time required for the entire writing of the panel is minimized while minimizing the time that the designated scan line occupies the writing electrode. By increasing the light emission time in one TV field, the brightness of the AC plasma display can be improved, the PDP with XGA resolution can be driven stably without changing the structure, and the number of sub-screens can be improved to improve the image quality. When increased, a driving method for compensating for the lowered luminance as the emission time decreases may be provided, thereby realizing a high-quality plasma display panel.

Claims (9)

During the writing period for writing image data into an AC plasma display panel having a plurality of discharge cells for realizing an image, and having a plurality of scan electrodes Y and a writing electrode Z for controlling the discharge cells. In the driving method, For the first scan line, a) Start of write discharge in which a discharge start scan pulse is applied to a scan electrode according to the image data, and a write pulse having a voltage opposite to that of the scan pulse is applied to a write electrode to initiate a discharge while the scan pulse is applied. step; And b) a plasma having a wall charge accumulation step of applying a wall charge accumulation scan pulse having a polarity opposite to that of the discharge initiation scan pulse and having an adjustable voltage magnitude and width according to the amount of wall charge to be accumulated; A driving method during the writing period of the display panel. The method of claim 1, And the wall charge accumulation scan pulse has a lower voltage than the discharge start scan pulse. The method of claim 1, And the wall charge accumulation scan pulse is applied after a pause period for a predetermined period after the application of the discharge start scan pulse. The method of claim 1, And maintaining a constant voltage at the common sustain electrode (X) during a portion of the writing period. The method of claim 1, And generating a front write discharge to reduce a required voltage of pulses applied to each electrode in the write period during the initialization period before the write period. The method of claim 1, And the discharge start scan pulse is a pulse having a positive voltage with respect to a reference potential. The method of claim 1, And the discharge start scan pulse is a pulse having a negative voltage with respect to a reference potential. The method of claim 1, About the second scan line c) a write discharge start for applying a discharge start scan pulse to a scan electrode according to the image data and applying a write pulse having a voltage opposite to that of the scan pulse to the write electrode while the scan pulse is applied; step; And d) a wall charge accumulation step of applying a wall charge accumulation scan pulse of opposite polarity to the discharge initiation scan pulse and having a voltage magnitude and width adjustable according to the amount of wall charges to be accumulated; , In order to shorten the total writing time for the first and second scan lines, a discharge start scan pulse for the second scan line is applied immediately after the discharge start scan pulse for the first scan line is finished. A driving method during a writing period of a plasma display panel. The method of claim 8, And a period in which the application period of the discharge initiation scan pulse to the second scan line overlaps with the application period of the wall charge accumulation scan pulse to the first scan line.