KR20060081613A - Driving apparatus and method for plasma display panel - Google Patents

Abstract

The present invention relates to a driving apparatus and method of a plasma display panel for adjusting the falling time of the driving pulse between the rising lamp and the falling lamp applied to the scan electrodes (Y ₁ ~ Y _m ) in the reset period, There is an effect of reducing the occurrence of noise.

The driving apparatus of the plasma display panel according to the present invention for achieving the above object is a predetermined method for the address electrode, the scan electrode Y ₁ to Y _m (m is a positive integer) and the sustain electrode in the reset period, the address period and the sustain period. In a plasma display panel driving apparatus including a data driver, a scan driver, a sustain driver, and a timing controller for applying a pulse, a scan electrode is divided into a plurality of electrode groups, and at least one scan electrode group among the plurality of scan electrode groups is provided. The driving pulse to be applied is adjusted so that the falling time between the set-up period and the set-down period of the reset period is different from the falling time of the driving pulse applied to the other scan electrode group.

Plasma Display Panel, Scanning Electrode Group, Reset Period, Rising Lamp, Falling Lamp, Falling Pulse, Falling Time, Noise

Description

Driving apparatus and method of plasma display panel {Driving Apparatus and Method for Plasma Display Panel}

1 is a diagram showing the structure of a typical plasma display panel.

2 is a diagram illustrating a method of implementing image gradation of a conventional plasma display panel.

3 is a view illustrating a driving waveform according to a driving method of a conventional plasma display panel.

4 is a view for explaining the falling time of the driving pulse between the rising ramp and the falling ramp applied in the reset period in the conventional method of driving a plasma display panel.

FIG. 5 is a view for explaining generation of noise due to the same falling time point of the driving pulses between the rising ramp and the falling ramp applied to the scan electrodes Y ₁ to Y _m in the reset period in the driving method of the conventional plasma display panel.

6 is a view for explaining a first embodiment of a driving apparatus for a plasma display panel according to the present invention;

7 is a diagram for explaining a concept of a scan electrode group.

8A to 8B are views for explaining a driving method using the driving apparatus of the plasma display panel of the present invention of FIG.

9A to 9B are diagrams for explaining noise reduced by a driving waveform according to the first embodiment of the present invention.

10 is a view for explaining a second embodiment of the driving apparatus of the plasma display panel according to the present invention;

11A to 11B are views for explaining a driving method using the driving apparatus of the plasma display panel of the present invention of FIG.

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

600; Data sorting unit 601; Timing controller

602; Data driver 603; Scan driver

604; Sustain drive

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, by adjusting a falling time point of a driving pulse between a rising ramp and a falling ramp applied to the scan electrodes (Y ₁ to Y _m ) during a reset period. The present invention relates to a driving apparatus and a method of a plasma display panel for reducing the occurrence of

In general, a plasma display panel is a partition wall formed between a front panel and a rear panel to form a unit cell, and each cell includes neon (Ne), helium (He), or a mixture of neon and helium (Ne + He). An inert gas containing a main discharge gas such as and a small amount of xenon is filled. When discharged by a high frequency voltage, the inert gas generates vacuum ultraviolet rays and emits phosphors formed between the partition walls to realize an image. Such a plasma display panel has a spotlight as a next generation display device because of its thin and light configuration.

1 illustrates a structure of a general plasma display panel.

As shown in FIG. 1, a plasma display panel includes a front panel in which a plurality of sustain electrode pairs formed by pairing a scan electrode 102 and a sustain electrode 103 are arranged on a front glass 101 that is a display surface on which an image is displayed. The rear panel 110 on which the plurality of address electrodes 113 are arranged so as to intersect the plurality of sustain electrode pairs on the back glass 111 forming the back surface 100 and the rear surface is coupled in parallel with a predetermined distance therebetween. .

The front panel 100 is made of a scan electrode 102 and a sustain electrode 103, that is, a transparent electrode (a) formed of a transparent ITO material and a metal material to mutually discharge and maintain light emission of the cells in one discharge cell. The scan electrode 102 and the sustain electrode 103 provided as the bus electrode b are included in pairs. The scan electrode 102 and the sustain electrode 103 are covered by one or more upper dielectric layers 104 that limit the discharge current and insulate the electrode pairs, and to facilitate the discharge conditions on the upper dielectric layer 104 top surface. A protective layer 105 on which magnesium oxide (MgO) is deposited is formed.

The rear panel 110 is arranged in such a manner that a plurality of discharge spaces, that is, strips 112 of a stripe type (or well type) for forming discharge cells are maintained in parallel. In addition, a plurality of address electrodes 113 which perform address discharge to generate vacuum ultraviolet rays are arranged in parallel with the partition wall 112. On the upper side of the rear panel 110, R, G, and B phosphors 114 which emit visible light for image display during address discharge are coated. A lower dielectric layer 115 is formed between the address electrode 113 and the phosphor 114 to protect the address electrode 113.

A method of implementing image gradation in such a plasma display panel is shown in FIG. 2.

2 is a diagram illustrating a method of implementing image grayscale of a conventional plasma display panel.

As shown in FIG. 2, in the conventional method of expressing a gray level of a plasma display panel, a frame is divided into several subfields having different number of emission times, and each subfield is a reset period (RPD) for initializing all cells again. ) Is divided into an address period APD for selecting a cell to be discharged and a sustain period SPD for implementing gradation according to the number of discharges. For example, when displaying an image with 256 gray levels, a frame period (16.67 ms) corresponding to 1/60 second is divided into eight subfields SF1 to SF8 as shown in FIG. 2, and eight subfields. Each of the SFs SF1 to SF8 is divided into a reset period, an address period, and a sustain period.

The reset period and the address period of each subfield are the same for each subfield. The address discharge for selecting the cell to be discharged is caused by the voltage difference between the address electrode and the transparent electrode which is the scan electrode. The sustain period is increased at a rate of 2 ⁿ ( ^where n = 0, 1, 2, 3, 4, 5, 6, 7) in each subfield. In this way, since the sustain period is different in each subfield, the gray scale of the image is expressed by adjusting the sustain period of each subfield, that is, the number of sustain discharges. The driving waveforms according to the driving method of the plasma display panel are shown in FIG. 3.

3 is a view illustrating a driving waveform according to a driving method of a conventional plasma display panel.

As shown in Fig. 3, the plasma display panel erases the reset period for initializing all the cells, the address period for selecting the cells to be discharged, the sustain period for maintaining the discharge of the selected cells, and the wall charges in the discharged cells. It is divided into an erase period for driving.

In the reset period, the rising ramp waveform Ramp-up is applied to all the scan electrodes at the same time in the setup period. This rising ramp waveform causes weak dark discharge within the full discharge cells. By this setup discharge, positive wall charges are accumulated on the address electrode and the sustain electrode, and negative wall charges are accumulated on the scan electrode.

In the set-down period, after the rising ramp waveform is supplied, the falling ramp waveform (Ramp-down) begins to fall from the positive voltage lower than the peak voltage of the rising ramp waveform and falls to a specific voltage level below the ground (GND) level voltage. By generating a weak erase discharge in the inside, the wall charges excessively formed in the scan electrode are sufficiently erased. By this set-down discharge, wall charges such that the address discharge can stably occur remain uniformly in the cells.

In the address period, the negative scan pulses are sequentially applied to the scan electrodes, and the positive data pulses are applied to the address electrodes in synchronization with the scan pulses. As the voltage difference between the scan pulse and the data pulse and the wall voltage generated in the reset period are added, address discharge is generated in the discharge cell to which the data pulse is applied. In the cells selected by the address discharge, wall charges are formed such that a discharge can occur when the sustain voltage Vs is applied. The sustain electrode is supplied with a positive polarity voltage Vz during the set down period and the address period so as to reduce the voltage difference with the scan electrode so as to prevent mis-discharge with the scan electrode.

In the sustain period, a sustain pulse Su is applied to the scan electrode and the sustain electrodes alternately. In the cell selected by the address discharge, as the wall voltage and the sustain pulse in the cell are added, a sustain discharge, that is, a display discharge, occurs between the scan electrode and the sustain electrode every time the sustain pulse is applied.

After the sustain discharge is completed, in the erase period, a voltage of an erase ramp waveform Ramp-ers having a small pulse width and a low voltage level is supplied to the sustain electrode to erase the wall charge remaining in the cells of the full screen.

In the plasma display panel driven by the driving waveform, the falling point of the driving pulse between the rising ramp and the falling ramp applied to the scan electrodes Y ₁ to Y _m in the reset period is applied to all the scan electrodes Y ₁ to Y _m . It is the same and descends sharply. The driving pulse between the rising ramp and the falling ramp in the conventional reset period is as shown in FIG. 4.

FIG. 4 is a view for explaining a dropping time point of a driving pulse between a rising lamp and a falling lamp applied in a reset period in the conventional method of driving a plasma display panel.

As shown in FIG. 4, in the driving method of the conventional plasma display panel, driving pulses between the rising ramp and the falling ramp applied to the scan electrodes Y ₁ to Y _m in the reset period are all the scan electrodes Y ₁ to Y. _m ) is applied to the line at the same time (ts) and descends. As such, when a driving pulse between the rising ramp and the falling ramp is applied to each of the scan electrodes Y ₁ to Y _m at the same time, and falls, the waveform is applied to the waveforms applied to the scan electrodes Y ₁ to Y _m . Will occur. At this same point in time, a driving pulse between the rising ramp and the falling ramp is applied to the scan electrodes Y ₁ to Y _m , respectively.

FIG. 5 is a view for explaining generation of noise due to the same falling time of the driving pulses between the rising ramp and the falling ramp applied to the scan electrodes Y ₁ to Y _m in the reset period in the conventional plasma display panel driving method. .

As shown in FIG. 5, in the conventional plasma display panel driving method, when a driving pulse between the rising lamp and the falling lamp is rapidly applied to the scan electrodes Y ₁ to Y _m at the same time point during the reset period, the scan electrodes fall. Noise is generated in the driving waveform applied to the. Such noise is caused by coupling through the capacitance of the panel, and is applied to the scan electrodes Y ₁ to Y _m when the driving pulse between the rising ramp and the falling ramp drops. Falling noise is generated on the waveform.

Noise generated in the drive waveform applied to the scan electrodes (Y ₁ ~ Y _m) by the same fall time of the drive pulse between rising ramp and a falling ramp is applied to the scan electrodes (Y ₁ ~ Y _m) as described above There is a problem of causing electrical damage to a scan driver IC (Integrated Circuit) for applying a scan pulse to a driving element of the plasma display panel, for example, scan electrodes Y ₁ to Y _m .

In order to solve this problem, an object of the present invention is to provide a driving apparatus and method for a plasma display panel for adjusting the falling time of the driving pulse between the rising lamp and the falling lamp applied to the scan electrode in the reset period.

The driving apparatus of the plasma display panel of the present invention for achieving the above object is a predetermined method for the address electrode, the scan electrode (Y ₁ to Y _m ) (m is a positive integer) and the sustain electrode in the reset period, the address period and the sustain period. In a plasma display panel driving apparatus including a data driver, a scan driver, a sustain driver, and a timing controller for applying a pulse, a scan electrode is divided into a plurality of electrode groups, and at least one scan electrode group among the plurality of scan electrode groups is provided. The driving pulse to be applied is adjusted so that the falling time between the set-up period and the set-down period of the reset period is different from the falling time of the driving pulse applied to the other scan electrode group.

Here, the number of scan electrode groups is two or more, and the total number of scan electrodes is less than or equal to one.

In addition, the scan electrode group may include one or more scan electrodes.

In addition, the scan electrode group may all include the same number of scan electrodes or one or more different scan electrodes.

In addition, the driving pulses are applied to all the scan electrodes included in the same scan electrode group in the falling time between the set-up period and the set-down period of the reset period.

In addition, the difference between the falling time of the two driving pulses falling at different time between the set-up period and the set-down period of the reset period is characterized in that the same or different.

Further, the difference between the falling timings of the two driving pulses falling at different time points is controlled within a range of 0 ms (microseconds) and 20 ms (microseconds) or less.

Also, the difference between the falling time of the driving pulse falling first and the falling time of the driving pulse falling last among the driving pulses falling at different time points is within the range of 0 ms (microseconds) and 20 ms (microseconds) or less. It is characterized by being adjusted.

In addition, the driving method of the plasma display panel according to the present invention for achieving the above object includes the address electrode, the scan electrodes Y ₁ to Y _m (m is a positive integer) and the sustain electrode during the reset period, the address period and the sustain period. In a driving method of a plasma display panel which expresses an image composed of a predetermined number of frames by a combination of at least one subfield to which a predetermined pulse is applied, the scan electrode is divided into a plurality of electrode groups, and the plurality of scan electrode groups The driving pulses applied to at least one of the scan electrode groups may be different from the falling timing of the driving pulses applied to the other scan electrode groups between the set-up period and the set-down period of the reset period.

Here, the number of scan electrode groups is two or more, and the total number of scan electrodes is less than or equal to one.

In addition, the scan electrode group may include one or more scan electrodes.

In addition, the scan electrode group may all include the same number of scan electrodes or one or more different scan electrodes.

In addition, the driving pulses are applied to all the scan electrodes included in the same scan electrode group in the falling time between the set-up period and the set-down period of the reset period.

In addition, the difference between the falling time of the two driving pulses falling at different time between the set-up period and the set-down period of the reset period is characterized in that the same or different.

Also, the difference between the falling timings of the two driving pulses falling at different time points is controlled within a range of 0 ms (microseconds) and 20 ms (microseconds) or less.

Also, the difference between the falling time of the driving pulse falling first and the falling time of the driving pulse falling last among the driving pulses falling at different time points is within the range of 0 ms (microseconds) and 20 ms (microseconds) or less. It is characterized by being adjusted.

In addition, the driving apparatus of the plasma display panel according to the present invention for achieving the above object includes the address electrode, the scan electrodes Y ₁ to Y _m (m is a positive integer) and the sustain electrode in the reset period, the address period and the sustain period. In a plasma display panel driving apparatus including a data driver, a scan driver, a sustain driver, and a timing controller for applying a predetermined pulse, the driving pulses applied to the scan electrodes Y ₁ to Y _m are set up in the reset period. It is characterized in that the falling time between the and down period is adjusted to be different for each scan electrode.

In addition, the difference between the falling time of the two driving pulses falling at different time between the set-up period and the set-down period of the reset period is characterized by the same or different.

Also, the difference between the falling timings of the two driving pulses falling at different time points is controlled within a range of 0 ms (microseconds) and 20 ms (microseconds) or less.

Also, the difference between the falling time of the driving pulse falling first and the falling time of the driving pulse falling last among the driving pulses falling at different time points is within the range of 0 ms (microseconds) and 20 ms (microseconds) or less. It is characterized by being adjusted.

In addition, the driving method of the plasma display panel according to the present invention for achieving the above object includes the address electrode, the scan electrodes Y ₁ to Y _m (m is a positive integer) and the sustain electrode during the reset period, the address period and the sustain period. In the driving method of a plasma display panel which expresses an image made up of a predetermined number of frames by a combination of at least one subfield to which a predetermined pulse is applied, the driving pulses applied to the scan electrodes Y ₁ to Y _m The falling time between the set-up period and the set-down period of the reset period is different for each scan electrode.

In addition, the difference between the falling time of the two driving pulses falling at different time between the set-up period and the set-down period of the reset period is characterized in that the same or different.

Further, the difference between the falling timings of the two driving pulses falling at different time points is controlled within a range of 0 ms (microseconds) and 20 ms (microseconds) or less.

Also, the difference between the falling time of the driving pulse falling first and the falling time of the driving pulse falling last among the driving pulses falling at different time points is within the range of 0 ms (microseconds) and 20 ms (microseconds) or less. It is characterized by being adjusted.

Hereinafter, exemplary embodiments of a driving apparatus and method of a plasma display panel of the present invention will be described in detail with reference to the accompanying drawings.

<First Embodiment>

6 is a view for explaining a first embodiment of the driving apparatus of the plasma display panel according to the present invention.

As shown in FIG. 6, the driving apparatus of the plasma display panel of the present invention includes a data alignment unit 600, a timing controller 601, a data driver 602, a scan driver 603, and a sustain driver 604. do.

The data aligning unit 600 aligns the image data input from the outside so as to be applied to each address electrode (X ₁ ~ X _n ).

The data driver 602 applies the data pulses of the aligned data to the address electrodes X ₁ to X _n of the plasma display panel 605.

The timing controller 601 controls the pulse timing of the scan driver 603 and the sustain driver 604.

The scan driver 603 applies a scan pulse and a sustain pulse to each scan electrode Y ₁ to Y _m .

The sustain driver 604 applies a sustain pulse to each sustain electrode Z. As shown in FIG. Through this process, the plasma display panel 605 is driven.

The driving apparatus of the plasma display panel according to the present invention divides the scan electrodes Y ₁ to Y _m into a plurality of electrode groups, and the driving pulses applied to at least one scan electrode group among the plurality of scan electrode groups are reset. The dropping time between the set-up period and the set-down period of the period is adjusted to be different from that of the driving pulses applied to the other scan electrode groups.

Here, before describing the operation of the first embodiment of the driving apparatus of the plasma display panel of the present invention, the concept of the scan electrode group described above will be described with reference to FIG. 7.

7 is a view for explaining the concept of a scan electrode group.

Referring to FIG. 7, scan (Y ₁ to Y _m ) electrodes of the plasma display panel 700 may be, for example, Ya electrode groups Ya ₁ to Ya (n) / 4 and Yb electrode groups Yb (n + 1). / 4 to Yb (2n) / 4), Yc electrode group (Yc (2n + 1) / 4 to Yc (3n) / 4), and Yd electrode group (Yd (3n + 1) / 4 to Yd (n)) Separated by.

In FIG. 7, the number of scan electrodes included in each scan electrode group (Ya electrode group, Yb electrode group, Yc electrode group, and Yd electrode group) is set to be the same, but each scan electrode group (Ya electrode group, Yb) is set to be the same. It is also possible to set the number of scan electrodes included in the electrode group, the Yc electrode group, and the Yd electrode group differently from each other. For example, 100 scan electrodes may be included in the Ya electrode group, and 200 scan electrodes may be included in the electrode group of Yb.

The number of scan electrode groups can also be adjusted. The number of scan electrode groups may be set between a minimum of two or more and a range smaller than the total number of scan electrodes, that is, 2 ≦ M ≦ (m−1) (where M is the number of scan electrode groups). .

Based on the concept of the electrode group as described above with reference to FIG. 7, the first embodiment of the driving apparatus of the plasma display panel of the present invention of FIG.

Based on the concept of the electrode group as described above with reference to FIG. 7, the first embodiment of the driving apparatus of the plasma display panel of the present invention of FIG.

As described above, in the first embodiment of the driving apparatus of the plasma display panel of the present invention, it is assumed that the scan electrodes Y ₁ to Y _m (m is a positive integer) are divided into a plurality of electrode groups. As described above, the 601 controls the scan driver 603 to apply the falling time point of the driving pulse applied to the at least one scan electrode group between the set-up period and the set-down period of the reset period to the remaining scan electrode groups. Adjust it differently from the descent time of the driving pulse. That is, the scan driver 603 described above scans the falling time of the driving pulses applied to the at least one scan electrode group between the set-up period and the set-down period of the reset period under the control of the timing controller 601. The driving pulses applied to the electrode group are different from the falling time point.

Herein, the falling time of the above-described driving pulse means a time when the driving pulse starts to fall after the set-up pulse of the ramp-up rises to the end between the set-up period and the set-down period of the reset period.

Here, the difference between the falling timings of the two driving pulses falling at different time points is preferably adjusted within a range of 0 ms (microseconds) and 20 ms (microseconds) or less.

In the above description, the difference between the falling timings of the two driving pulses is adjusted within the range of 0 ms (microseconds) and 20 ms (microseconds) or less. Margin is likely to deteriorate. Therefore, the difference between the falling time of the first falling driving pulse and the falling time of the last falling driving pulse among the driving pulses falling at different time points is adjusted within the range of 0 ms (microseconds) and 20 ms (microseconds) or less. More preferably.

Further, in the first embodiment of the driving apparatus of the plasma display panel of the present invention, when the scan electrodes (Y ₁ to Y _m ) are divided into a plurality of electrode groups, the number of scan electrode groups is two or more and the total number of scan electrodes is less than The scan electrode groups are set, and the scan electrodes Y ₁ to Y _m are divided and set by, for example, four, six, and ten scan electrode groups. Adjusts the falling point of the driving pulse applied during the set down period. Here, the divided scan electrode groups include one or more scan electrodes, and all of the scan electrode groups include the same number of scan electrodes or one or more different numbers of scan electrodes.

Here, as described above, it is preferable to apply a driving pulse having the same falling timing to all the scan electrodes included in the scan electrode group when adjusting the falling timing of the driving pulse. For example, the set-up period of the reset period of the driving pulses applied to all the scan electrodes included in the Ya electrode group in FIG. 7 described above, that is, the scan electrodes from scan electrode Ya ₁ to scan electrode Ya (n) / 4. The dropping time between and the set-down period is set to 5 ms (microseconds), and all scan electrodes included in the Yb electrode group, that is, scan electrodes Yb (n + 1) / 4 to scan electrodes Yb (2n) / 4 The falling time point of the driving pulse applied to the scan electrode up to 10 microseconds is set. As such, the falling time points between the set-up period and the set-down period of the reset period of the driving pulses applied to the scan electrodes belonging to one scan electrode group are set to be the same.

In addition, the difference between the falling timings of two driving pulses having different falling timings may be set identically. For example, all of the scan electrodes included in the Ya electrode group in FIG. 7 described above, that is, the falling timing of the driving pulses applied to the scan electrodes from scan electrode Ya ₁ to scan electrode Ya (n) / 4 is 5 ms ( Microseconds), and all the scan electrodes included in the Yb electrode group, that is, the timing of the drop of the driving pulses applied to the scan electrodes from the scan electrodes Yb (n + 1) / 4 to the scan electrodes Yb (2n) / 4 The driving pulse is set to 10 microseconds (microseconds) and applied to all scan electrodes included in the Yc electrode group, that is, all scan electrodes from scan electrode Yc (2n + 1) / 4 to scan electrode Yc (3n) / 4. Is set to 15 microseconds (microseconds), and is applied to all scan electrodes included in the Yd electrode group, that is, all scan electrodes from scan electrode Yd (3n + 1) / 4 to scan electrode Yd (n). The descent time of the drive pulse is set to 20 ms (microseconds). That is, the difference between the falling time of the driving pulse applied to the Ya scan electrode group and the falling time of the driving pulse applied to the Yb scan electrode group is 5 ms (microseconds) seconds, and the driving pulse applied to the Yb scan electrode group is The difference between the falling time and the falling time of the driving pulse applied to the Yc scan electrode group is 5 ms (microsecond), and the falling time of the driving pulse applied to the Yc scan electrode group and the driving pulse applied to the Yd scan electrode group and The difference is also 5 microseconds.

In addition, the difference between the falling timings of the two driving pulses having different falling timings may be set differently. For example, all of the scan electrodes included in the Ya electrode group in FIG. 10 described above, that is, the falling timing of the driving pulses applied to the scan electrodes from scan electrode Ya ₁ to scan electrode Ya (n) / 4 is 5 ms ( Microseconds), and all the scan electrodes included in the Yb electrode group, that is, the timing of the drop of the driving pulses applied to the scan electrodes from the scan electrodes Yb (n + 1) / 4 to the scan electrodes Yb (2n) / 4 The driving pulse is set to 7 microseconds (microseconds) and is applied to all scan electrodes included in the Yc electrode group, that is, all scan electrodes from scan electrode Yc (2n + 1) / 4 to scan electrode Yc (3n) / 4. Is set to 15 microseconds (microseconds), and is applied to all scan electrodes included in the Yd electrode group, that is, all scan electrodes from scan electrode Yd (3n + 1) / 4 to scan electrode Yd (n). The descent time of the drive pulse is set to 20 ms (microseconds). That is, the difference between the falling time of the driving pulse applied to the Ya scan electrode group and the falling time of the driving pulse applied to the Yb scan electrode group is 2 ms (microseconds) seconds, and the driving pulse applied to the Yb scan electrode group is The difference between the falling time of the driving pulse applied to the Yc scan electrode group and the falling time of the driving pulse applied to the Yc scan electrode group is 8 ms (microsecond). The difference with the time of descent is 5 microseconds (microseconds).

As described above, a method of driving the plasma display panel by adjusting the voltage drop timing of the driving pulse applied to the scan electrode in the address period will be described with reference to FIGS. 8A to 8B.

8A to 8B are views for explaining a driving method using the driving apparatus of the plasma display panel of the present invention of FIG.

As shown in Figs. 8A to 8B, the driving method of the plasma display panel according to the present invention includes the address electrodes, the scan electrodes Y ₁ to Y _m (m is a positive integer) during the reset period, the address period and the sustain period. In a driving method of a plasma display panel which expresses an image made up of a predetermined number of frames by a combination of at least one subfield to which a predetermined pulse is applied to a sustain electrode, the scan electrode is divided into a plurality of electrode groups, and reset. The falling time point of the driving pulse applied to the at least one scan electrode group between the set up period and the set down period of the period is adjusted to be different from the falling time of the driving pulse applied to the other scan electrode group.

For example, as shown in FIG. 8A, all the scan electrodes included in the Ya scan electrode group as in FIG. 7 described above have a time point t ₀ at the end of the ramp Ramp-Up after the set-up period of the reset period. The driving pulse which starts to fall at is applied, and all the scan electrodes included in the Yb scan electrode group are applied with the driving pulse which starts to fall at the time point t ₁ of the end of the rising ramp after the setup period of the reset period. All the scan electrodes included in the Yc scan electrode group are supplied with a falling driving pulse at the time t ₂ of the end of the rising ramp after the setup period of the reset period, and the reset period is applied to all scan electrodes included in the Yd scan electrode group. After the set-up period of, a driving pulse that starts to fall at the time t ₃ of the end of the rising ramp is applied. That is, the falling time points of the driving pulses applied to the respective scan electrode groups are different.

In FIG. 8A, driving pulses having different dropping points are applied to each scan electrode group. However, a predetermined number of electrode groups are selected from the scan electrode groups, and the driving pulses having different dropping points are selected only for the selected scan electrode groups. It is also possible to apply. For example, a driving pulse that starts to fall at the time point t ₀ of the end of the rising ramp is applied to the mode scan electrode included in the Ya scan electrode group and is applied to the Yb, Yc, and Yd scan electrode groups. All the included scan electrodes are applied with driving pulses starting to fall at the time t ₀ of the end of the rising ramp after the setup period of the reset period.

Here, the falling time point of the driving pulse is a time point at which the voltage of the driving pulse applied to the scan electrode Y starts to fall between the set up period and the set down period of the reset period.

As described above, when the driving electrodes are applied by dividing the scan electrodes Y ₁ to Y _m into a plurality of electrode groups, the number of the scan electrode groups described above is set to 2 or more and the total number of scan electrodes or less. It is desirable to drive.

Here, the scan electrode group may include one or more scan electrodes, and the scan electrode groups may all include the same number of scan electrodes or may include one or more different numbers of scan electrodes. For example, the aforementioned Ya scan electrode group may include 100 scan electrodes, and the Yb scan electrode group may include 200 scan electrodes.

In addition, it is preferable to apply a driving pulse having the same falling time point to all the scan electrodes included in the same scan electrode group. That is, the falling timings of the driving pulses applied to the mode scan electrodes included in the aforementioned Ya scan electrode group, that is, the scan electrodes from Ya ₁ to the scan electrodes Ya (n) / 4, are all set equal to 10 ms (microseconds). Can be.

In addition, in FIG. 8A, also, the difference between the falling time points of two drive pulses having different falling time points is the same. That is, when the difference between the falling time of the driving pulse applied to the Ya scan electrode group and the falling time of the driving pulse applied to the Yb scan electrode group is 5 ms (microseconds), the driving pulse applied to the Yb scan electrode group The difference between the falling time and the falling time of the driving pulse applied to the Yc scan electrode group, and the difference between the falling time of the driving pulse applied to the Yc scan electrode group and the falling time of the driving pulse applied to the Yd scan electrode group are all It is set to 5 microseconds (microseconds) as described above.

Unlike this, the difference between the falling timings of two driving pulses having different falling timings may be set to be different. Looking at such driving waveforms, the driving waveforms are as follows.

Referring to FIG. 8B, the difference between the falling timings of two driving pulses having different falling timings is different. That is, when the difference between the falling time of the driving pulse applied to the Ya scan electrode group and the falling time of the driving pulse applied to the Yb scan electrode group, that is, the difference between t ₀ and t ₁ is 5 ms (microsecond). The difference between the falling time point of the driving pulse applied to the Yb scan electrode group and the falling time point of the driving pulse applied to the Yc scan electrode group, that is, the difference between t ₁ and t ₂ is 7 ms (microsecond) The difference between the falling time of the driving pulse applied and the falling time of the driving pulse applied to the Yd scan electrode group, that is, the difference between t ₂ and t ₃ is set to 10 ms (microsecond).

This reduces the amount of noise generated in the drive pulses applied to the scan electrodes between the set up period and the set down period of the reset period.

As described above, the noise reduced by the present invention is as shown in FIGS. 9A to 9B.

9A to 9B are diagrams for describing noise reduced by a driving waveform according to a first embodiment of the present invention.

First, referring to FIG. 9A, it can be seen that noise generated in the driving pulse applied to the scan electrode is substantially reduced between the set-up period and the set-down period of the reset period as compared to FIG. 5.

Such noise is shown in more detail in FIG. 9B.

9B is a view illustrating region A of FIG. 9A in more detail. Referring to FIG. 9B, when the magnitude of the noise generated in FIG. 5 is V _r1 , the magnitude of the noise generated by the driving waveform of the present invention is V _r2 . It can be seen that V _r2 is significantly smaller than V _r1 described above. This means that the noise generated by the drive waveform of the present invention is smaller than the conventional drive waveform. The reason why the noise is reduced is to adjust the fall time between the set-up period and the set-down period of the driving pulse applied to the scan electrodes (Y ₁ to Y _m ), and thus the capacitance of the panel at each falling point. By reducing the coupling (Coupling) through, the falling noise generated in the driving pulse applied to the scan electrode is reduced at the time when the driving pulse applied to the scan electrode falls sharply. This prevents electrical damage of the plasma display panel drive element, for example, the scan driver IC of the scan driver.

On the other hand, in the second embodiment described above, the scan electrodes (Y ₁ to Y _m ) are divided into a plurality of scan electrode groups so that the application time of the scan reference voltage applied to the scan electrodes in the address period is different for each scan electrode. The time point of applying the scan reference pulse applied to each of the electrodes in the address period may be different for each scan electrode. This method is described in the following second embodiment.

Second Embodiment

10 is a view for explaining a second embodiment of the driving apparatus of the plasma display panel according to the present invention.

As shown in FIG. 10, the driving apparatus of the plasma display panel according to the present invention includes a data alignment unit 1000, a timing controller 1001, a data driver 1002, a scan driver 1003, and a sustain driver 1004. do.

The data aligning unit 1000 aligns the image data input from the outside to be applied to each address electrode X ₁ to X _n .

The data driver 1002 applies the data pulses of the aligned data to the address electrodes X ₁ to X _n of the plasma display panel 1005.

The timing controller 1001 controls the pulse timing of the scan driver 1003 and the sustain driver 1004.

The scan driver 1003 applies a scan pulse and a sustain pulse to each scan electrode Y ₁ to Y _m .

The sustain driver 1004 applies a sustain pulse to each sustain electrode Z. As shown in FIG. Through this process, the plasma display panel 1005 is driven.                     

As described above, the driving apparatus of the plasma display panel according to the present invention has a falling time between the set-up period and the set-down period of the reset period of the drive pulses applied to the plurality of scan electrodes Y ₁ to Y _m in the reset period. Each scan electrode Y ₁ to Y _m is adjusted differently.

That is, in the driving apparatus of the plasma display panel of the present invention, the timing controller 1001 controls the above-described scan driver 1003 to reset the driving pulses applied to the plurality of scan electrodes Y ₁ to Y _m as described above. The falling time of falling between the set-up period and the set-down period of the period is adjusted to be different for each scan electrode. That is, in the above-described scan driver 1003, the driving pulses applied to the plurality of scan electrodes in the reset period are scanned at the falling time between the set-up period and the set-down period of the reset period under the control of the timing controller 1001. Each electrode is different.

Here, as described above, the difference between the falling timings of the two driving pulses falling at different times between the set-up period and the set-down period of the reset period among the driving pulses applied to the predetermined scan electrode is greater than 0 ms (microsecond). It is desirable to control within a range of microseconds or less.

In the above description, the difference between the falling timings of the two driving pulses is adjusted within the range of 0 ms (microseconds) and 20 ms (microseconds) or less. Margin is likely to deteriorate. Therefore, the difference between the falling time of the first falling driving pulse and the falling time of the last falling driving pulse among the driving pulses falling at different time points is controlled within the range of 0 ms (microseconds) and 20 ms (microseconds) or less. More preferably.

In addition, the driving apparatus of the plasma display panel according to the present invention may set the same difference between the falling timings of two driving pulses falling at different timings. For example (in this case, the falling time of the driving pulse falling between the set-up period and the set-down period of the reset period is briefly referred to as 'falling time'), the falling time of the driving pulse applied to the Y ₁ scan electrode is 1; It is set to) (microsecond), and the falling time point of the driving pulse applied to the Y ₂ scan electrode is set to ₂ ㎲ (microsecond), and the falling time of the driving pulse applied to the Y ₃ scan electrode is ₃ ㎲ (microsecond). ), And the falling time point of the driving pulse applied to the Y ₄ scan electrode is set to 4 ms (microsecond). That is, the time difference between the falling time of the driving pulse applied to the Y ₁ scan electrode and the falling time of the driving pulse applied to the Y ₂ scan electrode is 1 ms (microsecond) second, and the driving pulse applied to the Y ₂ scan electrode is The time difference between the falling time of and the falling time of the driving pulse applied to the Y ₃ scan electrode is 1 ms (microsecond), and the falling time of the driving pulse applied to the Y ₃ scan electrode and the driving pulse applied to the Y ₄ scan electrode. The time difference from the descent of is also 1 ms (microseconds).

In addition, in the driving apparatus of the plasma display panel of the present invention, the difference between the falling timings of the two driving pulses falling at different timings may be set differently. For example, the falling time point of the driving pulse applied to the Y ₁ scan electrode is set to 1 ms (microseconds), and the falling time point of the driving pulse applied to the Y ₂ scan electrodes is set to ₂ ms (microseconds), The falling time point of the driving pulse applied to the Y ₃ scan electrode is set to ₄ ms (microsecond), and the falling time point of the driving pulse applied to the Y ₄ scan electrode is set to 7 ms (microsecond). That is, the time difference between the falling time of the driving pulse applied to the Y ₁ scan electrode and the falling time of the driving pulse applied to the Y ₂ scan electrode is 1 s (microseconds) seconds, and the driving pulse applied to the Y ₂ scan electrode. The time difference between the falling time of and the falling time of the driving pulse applied to the Y ₃ scan electrode is 2 ms (microseconds), and the falling time of the driving pulse applied to the Y ₃ scan electrode and the driving applied to the Y ₄ scan electrode. The time difference from the falling point of the pulse is 3 microseconds (microseconds).

As described above, a method of driving the plasma display panel by adjusting a falling time between the set-up period and the set-down period of the reset period of the driving pulse applied to the scan electrode will be described with reference to FIGS. 11A through 11B.

11A to 11B are views for explaining a driving method using the driving apparatus of the plasma display panel of the present invention of FIG.

As shown in Figs. 11A to 11B, the driving method of the plasma display panel according to the present invention includes the address electrodes and the scan electrodes Y ₁ to Y _m (m is a positive integer) during the reset period, the address period and the sustain period. And at least one subfield in which a predetermined pulse is applied to the sustain electrode. The method of driving the plasma display panel expresses an image made up of a predetermined number of frames, the method being applied to the scan electrodes Y ₁ to Y _m . As for the driving pulse, the falling time between the set-up period and the set-down period of the reset period is different for each scan electrode.

For example, as shown in Figure 11a, Y ₁ scan electrode, applying a drive pulse to fall at the time of t ₀ to the reset period and, Y ₂ scan electrode is applied with the driving pulse to fall at the timing t ₁ to a reset period, and , Y ₃ scan electrode is applied with the driving pulse to fall at the timing t ₂ in the reset period and, Y ₄ scan electrode is applied with the driving pulse to fall at the timing t ₃ the reset period and, Y _m scan electrode, the reset period The driving pulse which falls at the time of t _m is applied to. That is, the falling timings of the falling driving pulses applied to the respective scan electrodes are different.

In FIG. 11A, a driving pulse having a falling time point after a different setup period is applied to each scan electrode, but a predetermined number of electrodes are selected from these scan electrodes, and a driving pulse having a different falling time point only for the selected scan electrodes. It is also possible to apply. For example, Y ₁ scan electrode is applied to the driving pulse to fall at the time of t ₀ to the reset period, the _{Y 2, Y 3, Y 4} ...... Y m scan electrode is t ₁ at the reset period, respectively A falling driving pulse is applied at this point in time.

In addition, in FIG. 11A, also, the difference between the falling time points of two drive pulses having different falling time points is the same. That is, Y ₁ to Y La 1㎲ (microseconds), the time difference between the falling point in time after the set-up period of the driving pulse applied to the scan electrode Y ₂ and the falling time after the set-up period of the drive pulse applied to the scan electrode _The time difference between the falling time after the setup period of the driving pulse applied to the ₂ scan electrodes and the falling time after the setup period of the driving pulse applied to the Y ₃ scan electrodes, and after the setup period of the driving pulse applied to the Y ₃ scan electrodes. The time difference between the falling time of and the falling time after the setup period of the driving pulse applied to the Y ₄ scan electrode is set to 1 ms (microsecond) as described above.

Unlike this, the time difference between the falling time points of two driving pulses having different falling time points may be set to be different. Looking at these driving waveforms, the driving waveform is as follows.

Referring to FIG. 11B, the time difference between the falling time points of two driving pulses having different falling time points is different. That is, Y time difference between the _first falling timing between the falling point and the Y ₁ scan electrode set-up period and a set-down period of the drive pulse applied to between the setup period and a set-down period of the drive pulse applied to the scan electrode That is, when the difference between t ₀ and t ₁ is 1 ms (microseconds), the falling time between the set-up period and the set-down period of the driving pulse applied to the Y ₂ scan electrode is applied to the Y ₃ scan electrode. The time difference between the time of falling between the set-up period and the set-down period of the driving pulse, that is, the difference between t ₁ and t ₂ is 2 ms (microsecond), and the set-up period of the driving pulse applied to the Y ₃ scan electrode group. The time difference between the time of falling between the set down period and the time of falling between the set up period of the driving pulse applied to the Y ₄ scan electrode and the set down period, that is, the difference between t ₂ and t ₃ is ₃ ms (microseconds). Is set to).

As a result, as shown in FIGS. 9A to 9B, the amount of noise generated in the driving pulse applied to the scan electrode in the reset period is reduced.

The reason why the noise is reduced is that the panel blackout is applied at the time of applying each scan reference voltage by adjusting the falling time of the driving pulse applied to the scan electrodes (Y ₁ to Y _m ) between the set-up period and the set-down period of the reset period. By reducing coupling through capacitance, the falling noise generated in the waveform applied to the scan electrode at the time when the driving pulse falls sharply is reduced. This prevents electrical damage of the plasma display panel drive element, for example, the scan driver IC of the scan driver.

As such, the technical configuration of the present invention described above can be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims rather than the foregoing description, and the meaning and scope of the claims. And all changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

As described in detail above, the driving apparatus and method of the plasma display panel of the present invention adjust the falling time of the driving pulse applied to the scan electrode between the set-up period and the set-down period of the reset period, thereby driving the driving element of the plasma display panel. To prevent electrical damage.

Claims (24)

In the reset period, the address period and the sustain period, a data driver, a scan driver, a sustain driver, and a timing controller which apply a predetermined pulse to the address electrode, the scan electrodes Y ₁ to Y _m (m is a positive integer) and the sustain electrode In the driving device of the plasma display panel included, The scan electrode is divided into a plurality of electrode groups, and a driving pulse applied to at least one or more of the plurality of scan electrode groups is a scan having a different drop time between a set-up period and a set-down period of the reset period. A driving apparatus of the plasma display panel, characterized in that it is adjusted to be different from the falling time of the driving pulse applied to the electrode group. The method of claim 1, And the number of the scan electrode groups is two or more and less than the total number of the scan electrodes. The method of claim 2, And the scan electrode group includes one or more of the scan electrodes. The method of claim 3, wherein And all of the scan electrode groups include the same number of scan electrodes or one or more different numbers of the scan electrodes. The method according to any one of claims 1 to 4, And a driving pulse having the same falling time point between the set-up period and the set-down period of the reset period is applied to all scan electrodes included in the same scan electrode group. The method according to any one of claims 1 to 4, And the difference between the falling time points of the two driving pulses falling at different time points between the set-up period and the set-down period of the reset period is the same or different. The method of claim 6, The difference between the falling timings of the two driving pulses falling at different time points is adjusted within a range of 0 ms (microseconds) and 20 ms (microseconds) or less. The method of claim 6, The difference between the falling time of the driving pulse falling first and the falling time of the driving pulse falling last among the driving pulses falling at different time points is adjusted within the range of 0 ms (microseconds) and 20 ms (microseconds) or less. Driving device of the plasma display panel, characterized in that. Predetermined number of combinations of address electrodes, scan electrodes Y ₁ to Y _m (m is a positive integer), and at least one subfield in which a predetermined pulse is applied to the sustain electrodes in the reset period, the address period, and the sustain period. In the driving method of a plasma display panel expressing an image consisting of a frame of The scan electrode is divided into a plurality of electrode groups, and a driving pulse applied to at least one or more of the plurality of scan electrode groups is a scan having a different drop time between a set-up period and a set-down period of the reset period. A driving method of a plasma display panel, characterized in that it is different from the falling time of the driving pulse applied to the electrode group. The method of claim 9, And the number of scan electrode groups is two or more and less than the total number of scan electrodes. The method of claim 10, And the scan electrode group includes one or more of the scan electrodes. The method of claim 11, And all of the scan electrode groups include the same number of scan electrodes or one or more different numbers of scan electrodes. The method according to any one of claims 9 to 12, And a driving pulse having the same falling time point between the set-up period and the set-down period of the reset period is applied to all scan electrodes included in the same scan electrode group. The method according to any one of claims 9 to 12, And the difference between the falling time points of the two driving pulses falling at different time points between the set up period and the set down period of the reset period is the same or different. The method of claim 14, The difference between the falling timings of the two driving pulses falling at different time points is adjusted within a range of 0 ms (microseconds) and 20 ms (microseconds) or less. The method of claim 14, The difference between the falling time of the driving pulse falling first and the falling time of the driving pulse falling last among the driving pulses falling at different time points is adjusted within the range of 0 ms (microseconds) and 20 ms (microseconds) or less. Method of driving a plasma display panel, characterized in that. In the reset period, the address period and the sustain period, a data driver, a scan driver, a sustain driver, and a timing controller which apply a predetermined pulse to the address electrode, the scan electrodes Y ₁ to Y _m (m is a positive integer) and the sustain electrode In the driving device of the plasma display panel included, The driving pulses applied to the scan electrodes Y ₁ to Y _m are adjusted such that the falling time points between the set-up period and the set-down period of the reset period are different for each scan electrode. Drive. The method of claim 17, And the difference between the falling time points of the two driving pulses falling at different time points between the set-up period and the set-down period of the reset period is the same or different. The method of claim 18, The difference between the falling timings of the two driving pulses falling at different time points is adjusted within a range of 0 ms (microseconds) and 20 ms (microseconds) or less. The method of claim 18, The difference between the falling time of the driving pulse falling first and the falling time of the driving pulse falling last among the driving pulses falling at different time points is adjusted within the range of 0 ms (microseconds) and 20 ms (microseconds) or less. Driving device of the plasma display panel, characterized in that. Predetermined number of combinations of address electrodes, scan electrodes Y ₁ to Y _m (m is a positive integer), and at least one subfield in which a predetermined pulse is applied to the sustain electrodes in the reset period, the address period, and the sustain period. In the driving method of a plasma display panel for expressing an image consisting of a frame, The driving pulse applied to the scan electrodes (Y ₁ to Y _m ) has a falling time between the set-up period and the set-down period of the reset period, wherein each scan electrode has a different driving method. . The method of claim 21, And the difference between the falling time points of the two driving pulses falling at different time points between the set up period and the set down period of the reset period is the same or different. The method of claim 22, The difference between the falling timings of the two driving pulses falling at different time points is adjusted within a range of 0 ms (microseconds) and 20 ms (microseconds) or less. The method of claim 22, Among the driving pulses falling at different time points, the difference between the falling time of the driving pulse falling first and the falling time of the driving pulse falling last is adjusted within the range of 0 ms (microseconds) and 20 ms (microseconds) or less. Method of driving a plasma display panel, characterized in that.

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