JP2010032593A - Drive method for plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drive method for a plasma display panel performing stable normal display regardless whether the temperature of a panel tube face is high or low. <P>SOLUTION: If a temperature detected by a temperature detecting means is higher than a predetermined temperature Ta during a maintenance discharge period right before a reset period for an on-cell reset, a first maintenance discharge waveform is used. The first maintenance discharge waveform finishes the maintenance discharge period by applying maintenance pulses 55a and 55b so that a scanning electrode and a maintenance electrode are used as an anode and a cathode, respectively. If the temperature is lower than the predetermined temperature Ta, a second maintenance discharge waveform is used. The second maintenance discharge waveform finishes the maintenance discharge period by applying maintenance pulses 56a and 56b so that the maintenance electrode and the scanning electrode are used as the anode and the cathode, respectively, and then by applying the maintenance electrode adjustment pulse 57b of a waveform that gradually drops to the maintenance electrode. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a plasma display panel that can be used in a TV or a monitor, and more particularly to a technique that is effective when applied to a driving method of a plasma display panel.

  A plasma display device using a plasma display panel (hereinafter sometimes referred to as PDP) has a higher response speed and a wider viewing angle than a liquid crystal display, is relatively easy to increase in size, and is self-luminous. Since it is a type, it has characteristics such as high-quality display and is widely used for TVs and monitors.

  The light emission principle of the PDP is that a sustain discharge is generated in the discharge cell by a sustain pulse applied between the sustain electrode and the scan electrode, and ultraviolet light generated from the excited discharge gas is converted into visible light by a phosphor. When displaying an image having gradation in a PDP, one field is divided into a plurality of subfields in time, and the number of sustain pulses is applied to each subfield in accordance with the weighted value, thereby adjusting the number of pulses. The discharge cell is caused to emit light with a corresponding brightness (luminance).

  Each subfield includes a reset period, an address period, and a sustain discharge period. A reset process for initializing the charge distribution of each cell is performed in the reset period, an address discharge for selecting a discharge cell to be lit in the address period is performed, and a sustain discharge for display by a sustain pulse in the sustain discharge period Is done.

In the reset period, as described in International Publication No. 2008/18125 pamphlet (Patent Document 1), normally, in the first subfield of each field, all-cell reset having write discharge for all cells is performed. In the subsequent subfields, on-cell reset is performed in which reset discharge is performed only when sustain discharge is performed in the immediately preceding sustain discharge period for each cell.
International Publication No. 2008/18125 Pamphlet

  When an on-cell reset as described in the above-mentioned Patent Document 1 is used, depending on the panel structure conditions, an erroneous discharge may occur during address discharge due to the temperature of the panel surface of the panel, resulting in a display defect. .

  For example, in the address period, when cells adjacent to both the left and right sides of a certain non-lighted cell are lighted cells, the charge is leaked from the address discharge in the adjacent lighted cell to the non-lighted cell, but the sustain discharge does not occur. Even in a non-lighted cell, a minute erroneous discharge occurs. As a result, an extra wall charge is formed in the non-lighted cell, and when the address period is entered while the extra wall charge is retained, the address discharge becomes unstable in the cell, which may cause a display defect such as flicker. is there.

  This phenomenon is unlikely to occur when the panel surface is hot. This is thought to be due to the influence of the charge leak phenomenon. The charge leak phenomenon is a weak discharge that does not lead to an address discharge between the address electrode and the scan electrode by applying a voltage to the address electrode when scanning another line in the address period. This is a phenomenon that occurs and cancels excess wall charges on the scan electrode. For this reason, the address discharge is stable, and display defects such as flickering hardly occur.

  On the other hand, when the panel tube surface is at a low temperature, the charge leak phenomenon hardly occurs and the influence of the charge leak phenomenon becomes small, so that extra wall charges in the non-lighted cells remain. For this reason, the address discharge is not stable, and display failure such as flicker may occur.

  As described above, in the PDP, the discharge characteristics of the panel greatly change depending on the temperature. In particular, a display failure (false lighting, false lighting) depends on whether or not it is affected by a decrease in wall charge (charge leakage phenomenon) due to a micro discharge between the scan electrode and the address electrode during the address period that occurs at high temperatures. May occur.

  Accordingly, an object of the present invention is to provide a method for driving a plasma display panel that stably performs normal display regardless of whether the temperature of the panel tube surface is high or low. The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

  Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows.

  In the driving method of the plasma display panel according to the representative embodiment of the present invention, the temperature of the panel surface of the panel is detected by the temperature detecting means. A sustain discharge waveform that leaves a large amount of wall charge between the scan electrodes is applied. When the panel tube surface is at a low temperature, a sustain discharge waveform that leaves a small amount of wall charges between the address electrodes and the scan electrodes at the end of the sustain discharge period is applied. It is characterized by switching.

  Among the inventions disclosed in the present application, effects obtained by typical ones will be briefly described as follows.

  According to the representative embodiment of the present invention, the influence of the charge leakage phenomenon that varies depending on the temperature of the panel tube surface is absorbed, and a stable display of the plasma display panel can be achieved regardless of the temperature of the panel tube surface or a change in temperature. Can be done.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiment, and the repetitive description thereof will be omitted. In the following, in order to make the features of the present invention easier to understand, the description will be made in comparison with the prior art.

<PDP (basic structure)>
FIG. 4 is an exploded perspective view showing an example of a basic structure of a typical PDP. FIG. 4 shows a set of display cells (Cr, Cg, Cb) corresponding to pixels. For the sake of explanation, the x direction (first direction, horizontal direction), y direction (second direction, vertical direction), and z direction (third direction, panel surface vertical direction) are shown.

  The PDP 1 is formed by combining the front substrate 10 and the rear substrate 20 and has a discharge space 26 therebetween. In the front substrate 10, a group of display electrodes 12 (12X, 12Y) is arranged on the front glass substrate 11 in the x direction. The display electrode 12 includes a scan electrode 12Y that applies a scan pulse and a sustain electrode 12X that repeatedly performs a sustain discharge between the scan electrode 12Y. The display electrode 12 (12X, 12Y) is composed of, for example, a transparent electrode and a bus electrode. On the front glass substrate 11, the display electrode 12 group is covered with a dielectric layer 13. A protective layer 14 is further formed on the dielectric layer 13. The dielectric layer 13 and the protective layer 14 are formed on the entire surface corresponding to the display area (screen) of the PDP 1.

  In the rear substrate 20 disposed to face the front substrate 10, the address electrode 22 group is disposed on the rear glass substrate 21 in the y direction intersecting with the display electrode 12. The group of address electrodes 22 is covered with a dielectric layer 23. On the dielectric layer 23, barrier ribs 24 are formed in a lattice pattern by vertical barrier ribs 24A and horizontal barrier ribs 24B. The barrier ribs 24 divide the discharge space 26 for each unit light emitting region (display cell). A phosphor (phosphor layer) 25 that emits visible light of each color of red (R), green (G), and blue (B) is formed in a region partitioned by a partition wall 24 above the address electrode 22 (z direction). (25r, 25g, 25b) are formed by color-coding in order for each section. Each discharge space 26 defined by the barrier ribs 24 corresponds to each intersection of the sustain electrode 12X, the scan electrode 12Y, and the address electrode 22.

  In an internal region formed by bonding the front substrate 10 and the rear substrate 20, a discharge gas (for example, a gas obtained by mixing about several percent of Xe with Ne) is sealed, so that an airtight discharge space 26 is formed. Is configured. The peripheral part of PDP1 is bonded together with a sealing material.

  In the driving of the PDP 1 (subfield method and address display separation method), a discharge (address discharge) is generated by applying a voltage between the address electrode 22 and the scan electrode 12Y in the display cell to be selected (address period). In addition, a discharge (sustain discharge) is generated by applying a voltage between the pair of sustain electrode 12X and scan electrode 12Y for the selected display cell (sustain discharge period). The phosphor layer 25 is excited by the ultraviolet rays generated at this time to emit each color. Thus, light emission (lighting) is performed in a desired display cell in the subfield. In addition, the luminance of the pixel (display cell) is expressed by selecting a subfield to be lit in the field.

<PDP (Drive Circuit / Drive Waveform)>
FIG. 5 is a diagram showing an example of a PDP drive circuit configuration in a typical plasma display device. The PDP drive circuit includes a power supply circuit 41 that supplies a voltage to each circuit, a control circuit 42 that transmits a control signal, a sustain electrode drive circuit 31, a scan electrode drive circuit 32, and an address circuit 43. Each circuit is connected to the sustain electrode 12X, the scan electrode 12Y, and the address electrode 22 shown in FIG. 4, and applies a voltage to each electrode. This applied voltage is plotted on the vertical axis and time is plotted on the horizontal axis to form a drive waveform.

  FIG. 6 is a schematic diagram of a driving waveform of a PDP in a typical plasma display device. One field is usually composed of a plurality of subfields. Each subfield includes a reset period, an address period, and a sustain discharge period. In the reset period, normally, as described in Patent Document 1 described above, in the first subfield of each field, all-cell reset having write discharge for all cells is performed, and in the subsequent subfields, On-cell reset is performed in which reset discharge is performed only when a sustain discharge is performed in the immediately preceding sustain discharge period for the cell.

  In the display quality of the PDP, it is required to reduce the background light emission due to the discharge in the reset period and improve the contrast. Here, the all-cell reset is forcibly resetting all the cells without depending on the discharge state in the immediately preceding sustain discharge period, and is always accompanied by discharge. On-cell reset, on the other hand, does not lead to an increase in background light emission because reset discharge occurs only in cells that have had a sustain discharge in the immediately preceding sustain discharge period, and no discharge occurs in cells that have no sustain discharge.

  In the first subfield in FIG. 6, the configuration of the drive waveform in the reset period in which all cells are reset is scan electrode writing in which the voltage is gradually increased in the scan electrode 12Y in order to form charges in all cells in the first writing period. A pulse 51a is applied. In the subsequent compensation period, a scan electrode reset pulse 52a whose voltage gradually decreases is applied to the scan electrode 12Y in order to reset the charge formed in the cell while leaving a necessary amount. At this time, the wall charge is adjusted by applying the sustain electrode compensation voltage 52b to the sustain electrode 12X.

  In the next address period, the following address operation is performed in order to form wall charges in the cell to be displayed. During the address period, the scan electrode compensation voltage 53a is applied to the scan electrode 12Y, and the scan pulse 54a, which is a voltage lower than the scan electrode compensation voltage 53a, is sequentially applied to each scan electrode 12Y. At this time, the address pulse 54c is applied to the address electrode 22 of the cell to be displayed in accordance with the scanning pulse 54a. An address discharge occurs in the cell to which the scan pulse 54a and the address pulse 54c are applied simultaneously, and wall charges are formed on the scan electrode 12Y and the sustain electrode 12X.

  In the next sustain discharge period, the sustain discharge is generated using the wall charges formed by the address discharge described above. At this time, discharge is maintained by repeatedly applying sustain pulses 55a, 55b, 56a, and 56b to scan electrode 12Y and sustain electrode 12X.

  In the reset period after the second subfield, an on-cell reset method is applied in which no write discharge is performed on all cells at the time of reset.

<Overview>
In the above-described on-cell reset, when the on-cell reset as described in Patent Document 1 is used, as described above, depending on the conditions of the panel structure, the temperature of the panel tube surface may be increased or decreased during address discharge. Incorrect discharge may occur and display may be defective.

  FIG. 7 is a diagram for explaining an example in which erroneous discharge occurs during address discharge in a typical PDP. For example, in the address period, when the cells adjacent to the left and right sides of a certain non-lighted cell 62 are the lighted cells 61, the charge is leaked from the address discharge in the adjacent lighted cells 61 to the non-lighted cell 62, and the sustain discharge occurs. However, a small erroneous discharge occurs even in the non-lighted cell 62. As a result, excessive wall charges are formed on the scan electrodes 12Y and the sustain electrodes 12X in the non-lighted cells 62. When the reset period in the next subfield is an on-cell reset, and if the address period is entered while holding the above-mentioned extra wall charges, address discharge cannot be generated stably in the cell, resulting in display defects such as flickering. There is.

  This phenomenon is unlikely to occur when the panel surface is hot. This is thought to be due to the influence of the charge leak phenomenon. As described above, the charge leakage phenomenon means that an address discharge is generated between the address electrode 22 and the scan electrode 12Y by applying a voltage to the address electrode 22 when another line is scanned in the address period. This is a phenomenon in which a weak discharge that does not reach is generated and the wall charges on the scan electrode 12Y are canceled. Even in the case of the example in FIG. 7, the surplus wall charges formed on the scanning electrode 12Y are canceled out, so that the address discharge is stable and display defects such as flickering are unlikely to occur.

  On the other hand, when the panel tube surface is at a low temperature, the charge leak phenomenon hardly occurs and the influence of the charge leak phenomenon becomes small, so that extra wall charges in the non-lighted cell 62 remain. For this reason, the address discharge is not stable, and display failure such as flicker may occur.

  As a method for making display defects such as flickering less likely to occur when the panel surface of the panel is at a low temperature, a micro discharge is generated at the end of the sustain discharge period, with the scan electrode 12Y serving as an anode and the sustain electrode 12X serving as a cathode. The wall discharge on both electrodes is decreased to end the sustain discharge period, and the on-cell reset in the next reset period is passed. As a result, the non-lighted cell 62 enters the address period with a small amount of extra wall charges on the scan electrode 12Y, so that the address discharge is stabilized and display defects such as flickering are improved.

  However, if the sustain discharge waveform as described above is used as it is even when the panel surface of the panel is high temperature, consistency can be obtained when the entire system of the PDP and the drive circuit is designed based on the operating characteristics at high temperature. It will disappear. The same applies to the reverse case. Therefore, in the PDP and its drive circuit according to an embodiment of the present invention, the panel surface of the panel is detected by detecting the tube surface temperature of the panel and switching the waveform at the end of the sustain discharge period between the high temperature and the low temperature. Regardless of whether the temperature is high or low, stable and normal display is performed.

  Hereinafter, the sustain discharge waveform in the drive waveform shown in FIGS. 6 and 7 in which the address discharge is stable and display defects are reduced when the panel tube surface is high is referred to as the first sustain discharge waveform. A sustain discharge waveform that stabilizes the address discharge and improves display defects when the tube surface is at a low temperature is defined as a second sustain discharge waveform.

<Embodiment>
Hereinafter, a plasma display device according to an embodiment of the present invention will be described. FIG. 1 is a diagram illustrating an example of a driving waveform of a PDP in the plasma display device according to the present embodiment. The drive waveform indicates a waveform of a portion including an on-cell reset, and a compensation discharge is generated only in a cell that is lit in the sustain discharge period in the immediately preceding subfield in the reset period.

  The first sustain discharge waveform shown in FIG. 1A is a waveform applied when the panel surface of the panel is at a high temperature. At the end of the sustain discharge period, the sustain pulse 55a is applied to the scan electrode 12Y, and then the reset period starts. In the reset period, the sustain electrode is applied by applying a scan electrode reset pulse 52a that gradually decreases in voltage from the state in which there is a negative wall charge on the scan electrode 12Y and a positive wall charge on the sustain electrode 12X. The wall charges formed in the cell are adjusted by causing a micro discharge with the positive wall charges on 12X. In the subsequent address period, the scan electrode compensation voltage 53a is applied to the scan electrode 12Y except for when the scan pulse 54a is applied, so that negative wall charges are maintained on the scan electrode 12Y.

  For example, as described above with reference to FIG. 7, even if extra wall charge leaks to the non-lighted cell 62 during the address period, the first sustain discharge waveform shows that when the panel tube surface is hot, Under the influence of the leak phenomenon, a weak discharge that does not lead to a discharge occurs between the address electrode 22 and the scan electrode 12Y, and the address discharge is stabilized in order to cancel the excess wall charges on the scan electrode 12Y. . However, since the panel tube surface is not affected by the charge leakage phenomenon when the panel tube surface is low, excess wall charges on the scan electrode 12Y are not canceled out, causing display defects such as flicker.

  As a means for improving this display defect, the second sustain discharge waveform as shown in FIG. 1B is used when the panel tube surface is at a low temperature. In the second sustain discharge waveform, the sustain pulse 56b is applied to the sustain electrode 12X at the end of the sustain discharge period, and the sustain electrode adjustment pulse 57b for gradually decreasing the voltage is applied to the sustain electrode 12X. As a result, unlike the case of the first sustain discharge waveform, by generating a micro discharge in which the scan electrode 12Y serves as an anode and the sustain electrode 12X serves as a cathode, a small negative wall charge is generated on the scan electrode 12Y. There is a small positive wall charge on 12X.

  At this time, when the sustain electrode adjustment pulse 57b whose voltage is gradually decreased is applied, the potential difference between the sustain electrode 12X and the scan electrode 12Y becomes a normal rectangular-wave sustain pulse (55a and 55b, and 56a and 56b). The voltage is applied so as to be larger than the voltage at which sustain discharge occurs (sustain discharge voltage). Thereby, a slight discharge is generated to such an extent that the wall charges on the scanning electrode 12Y are inverted from positive to negative. In the example of FIG. 1B, the potential difference is increased by lowering the potential of the sustain electrode adjustment pulse 57b and lowering the potential of the sustain electrode 12X. However, the potential of the corresponding sustain pulse 55a is increased. Then, the potential difference may be increased by raising the potential of the scanning electrode 12Y. Further, the potential difference may be increased by a combination of these.

  In the subsequent reset period, a scan electrode reset pulse 52a whose voltage gradually decreases is applied to the scan electrode 12Y, thereby causing a minute discharge between the address electrode 22 and adjusting wall charges formed in the cell.

  In the subsequent address period, similarly to the first sustain discharge waveform, the scan electrode compensation voltage 53a is applied to the scan electrode 12Y except for when the scan pulse 54a is applied, and a negative wall is formed on the scan electrode 12Y. Maintain charge. Compared to the first sustain discharge waveform, the second sustain discharge waveform has a smaller amount of wall charges accumulated in the scan electrode 12Y during the address period. For this reason, the address discharge is stabilized when the panel tube surface is not affected by the charge leakage phenomenon at a low temperature.

  However, when the second sustain discharge waveform is used when the panel tube surface is at a high temperature, an address discharge cannot be performed due to the influence of the charge leakage phenomenon, and there is a problem that even a cell to be lit cannot be lit. Therefore, the first sustain discharge waveform shown in FIG. 1 (a) is applied at a high temperature, and the second sustain discharge waveform shown in FIG. 1 (b) is applied at a low temperature, thereby changing the temperature of the panel tube surface. Corresponding and stable display on PDP is enabled.

  FIG. 2 is a diagram showing an example of a drive circuit configuration in the plasma display device of the present embodiment. As described above, in order to switch the sustain discharge waveform corresponding to the temperature change of the panel tube surface, for example, the thermistor 44 is installed on the substrate of the control circuit 42 in the drive circuit configuration shown in FIG. In the example of FIG. 2, the thermistor 44 is installed on the substrate of the control circuit 42. However, the present invention is not limited to this, and the thermistor 44 is installed on the substrate of the sustain electrode drive circuit 31, the scan electrode drive circuit 32, and the address circuit 43. Or may be installed on a chassis to which the PDP is attached.

  In accordance with the temperature detected by the thermistor 44, the control circuit 42 switches between the first sustain discharge waveform (FIG. 1 (a)) and the second sustain discharge waveform (FIG. 1 (b)). At this time, the correlation between the temperature detected by the thermistor 44 and the temperature of the panel tube surface is grasped in advance. For example, when the threshold temperature of the high and low temperature of the panel tube surface is Ta = 65 ° C., the first sustain discharge waveform (FIG. 1 (a) is detected at the temperature detected by the thermistor 44 corresponding to the panel tube surface of 65 ° C. or higher. On the other hand, the second sustain discharge waveform (FIG. 1B) is applied at the temperature detected by the thermistor 44 whose panel tube surface corresponds to 65 ° C. or lower.

  When the temperature of the panel surface of the panel stagnates around 65 ° C. and slightly fluctuates, switching of the driving waveform is frequently repeated, and there is a concern that the stability of driving / display is lowered. Therefore, for example, when the temperature rises, the panel tube surface threshold temperature T1 = 70 ° C. and the second sustain discharge waveform is switched to the first sustain discharge waveform, and when the temperature falls, the panel tube surface threshold temperature T2 = 60. The first sustain discharge waveform is switched to the second sustain discharge waveform at ° C. Thus, it is desirable to provide hysteresis when determining the switching of the sustain discharge waveform.

  Furthermore, as shown in FIG. 3, at least one of the arrival potential of the scan electrode reset pulse 52a, which is applied to the scan electrode 12Y during the reset period, and the voltage gradually decreases, and the arrival potential of the sustain electrode compensation voltage 52b, A wider driving margin can be obtained by making the value variable in accordance with the switching between the sustain discharge waveform and the second sustain discharge waveform, and by setting the values suitable for each.

  FIG. 3 is a diagram showing another example of the driving waveform of the PDP in the plasma display device of the present exemplary embodiment. In the first sustain discharge waveform shown in FIG. 3A, since the amount of wall charges on the scan electrode 12Y is large during the address period, the optimum value of the potential reached by the scan electrode reset pulse 52a is a lower potential. On the other hand, in the second sustain discharge waveform shown in FIG. 3B, it is necessary to generate a compensation discharge from a state in which the wall charge on the scan electrode 12Y is small during the address period. The optimum value is a higher potential.

  As described above, according to the driving circuit in the plasma display device of the present embodiment, the first sustain discharge waveform and the second sustain discharge waveform are considered in consideration of hysteresis corresponding to the temperature of the panel tube surface. By switching between and, address discharge can be generated stably. As a result, it is possible to perform stable display on the PDP regardless of the temperature of the panel tube surface and the change in temperature. It can be improved and is extremely useful.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the present invention is not limited to the embodiment, and various modifications can be made without departing from the scope of the invention. Needless to say.

  The present invention is applicable to a plasma display panel that can be used for a TV or a monitor.

It is a figure which shows the example of the drive waveform of PDP in the plasma display apparatus of one embodiment of this invention. It is the figure which showed an example of the drive circuit structure in the plasma display apparatus of one embodiment of this invention. It is the figure which showed another example of the drive waveform of PDP in the plasma display apparatus of one embodiment of this invention. It is the disassembled perspective view which showed an example of the basic structure of typical PDP. It is the figure which showed an example of the drive circuit structure of PDP in a typical plasma display apparatus. It is the schematic of the drive waveform of PDP in a typical plasma display apparatus. It is a figure explaining an example which a false discharge generate | occur | produces at the time of address discharge in typical PDP.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... PDP, 10 ... Front substrate, 11 ... Front glass substrate, 12 ... Display electrode, 12X ... Sustain electrode, 12Y ... Scan electrode, 13 ... Dielectric layer, 14 ... Protective layer, 20 ... Back substrate, 21 ... Back glass Substrate, 22 ... address electrode, 23 ... dielectric layer, 24 ... partition wall, 24A ... vertical partition wall, 24B ... horizontal partition wall, 25 (25r, 25g, 25b) ... phosphor layer, 26 ... discharge space,
31: sustain electrode drive circuit, 32: scan electrode drive circuit, 41 ... power supply circuit, 42 ... control circuit, 43 ... address circuit, 44 ... thermistor,
51a ... Scanning electrode write pulse, 52a ... Scanning electrode reset pulse, 52b ... Sustain electrode compensation voltage, 53a ... Scanning electrode compensation voltage, 54a ... Scanning pulse, 55a, 55b, 56a, 56b ... Sustain pulse, 57b ... Sustain electrode adjustment pulse ,
61 ... Lighting cell, 62 ... Non-lighting cell.

Claims (7)

A front substrate having a scan electrode and a sustain electrode arranged in parallel on the front glass substrate, and a back substrate having an address electrode arranged on the rear glass substrate in a direction intersecting the scan electrode and the sustain electrode. A plasma display panel that forms cells between the front substrate and the back substrate by being disposed oppositely;
A scan electrode driving circuit for applying a voltage to the scan electrode;
A sustain electrode driving circuit for applying a voltage to the sustain electrode;
An address electrode driving circuit for applying a voltage to the address electrode;
A control circuit for controlling the operation of each of the drive circuits,
When displaying an image by causing the cell to emit light, a reset period for adjusting the amount of charge in the cell for each subfield obtained by dividing one field into a plurality of portions in time, and
An address period for selecting the cell to emit light; and
A sustain discharge period for causing the selected cell to emit light by applying a sustain pulse to at least one of the scan electrode and the sustain electrode and repeatedly performing a sustain discharge between the scan electrode and the sustain electrode is provided. And
In the reset period, all-cell reset that adjusts the charge amount for all the cells regardless of the state of charge in the cells in the immediately preceding subfield,
A method of driving a plasma display panel, which performs either one of on-cell reset that adjusts the amount of charge only when the target cell is lit in the immediately preceding subfield,
The plasma display panel is provided with temperature detecting means for detecting the temperature of the tube surface,
In the sustain discharge period immediately before the reset period in which the on-cell reset is performed, in at least one of the one field,
When the temperature detected by the temperature detecting means is higher than a predetermined temperature Ta, the sustain pulse is applied so that the scan electrode serves as an anode and the sustain electrode serves as a cathode, and the sustain discharge period ends. Applying the first sustain discharge waveform;
When the temperature detected by the temperature detecting means is lower than a predetermined temperature Ta, the sustain pulse is applied so that the sustain electrode serves as an anode and the scan electrode serves as a cathode, and then gradually applied to the sustain electrode. A driving method of a plasma display panel, wherein a sustaining electrode adjusting pulse having a descending waveform is applied and a second sustaining discharge waveform for ending the sustaining discharge period is applied. The driving method of the plasma display panel according to claim 1,
When applying the sustain electrode adjustment pulse to the sustain electrode at the end of the second sustain discharge waveform,
A driving method of a plasma display panel, wherein an arrival potential of the sustain electrode adjustment pulse is lower than an arrival potential in the negative direction of the sustain pulse at the sustain electrode. The driving method of the plasma display panel according to claim 1,
When applying the sustain electrode adjustment pulse to the sustain electrode at the end of the second sustain discharge waveform,
In the corresponding scan electrode, the potential of the sustain pulse applied to the scan electrode when the sustain electrode adjustment pulse is applied is higher than the positive potential of the other sustain pulses applied to the scan electrode in the subfield. A driving method of a plasma display panel, characterized by having a high potential. The driving method of the plasma display panel according to claim 1,
When performing the on-cell reset during the reset period,
At least one of an arrival potential of a scan electrode reset pulse having a gradually decreasing waveform applied to the scan electrode and a sustain electrode compensation voltage applied to the sustain electrode,
The reset period immediately after the sustain discharge period to which the first sustain discharge waveform is applied is different from the reset period immediately after the sustain discharge period to which the second sustain discharge waveform is applied. A method for driving a plasma display panel. The method for driving a plasma display panel according to claim 4,
The arrival potential of the scan electrode reset pulse in the reset period immediately after the sustain discharge period to which the first sustain discharge waveform is applied is immediately after the sustain discharge period to which the second sustain discharge waveform is applied. A driving method of a plasma display panel, wherein the driving voltage is lower than an arrival potential of the scan electrode reset pulse in the reset period. The driving method of the plasma display panel according to claim 1,
As the temperature detection means, it is installed either on the substrate of the scan electrode drive circuit, the sustain electrode drive circuit or the address electrode drive circuit, on the substrate of the control circuit, or on the chassis to which the plasma display panel is attached. A plasma display panel driving method characterized by using a thermistor. The driving method of the plasma display panel according to claim 1,
When applying the first sustain discharge waveform and the second sustain discharge waveform in the sustain discharge period based on the temperature detected by the temperature detecting means,
The switching temperatures T1 and T2 are set so that T1>Ta> T2 with respect to the predetermined temperature Ta,
When the temperature rises, when the temperature detected by the temperature detection means becomes higher than the switching temperature T1, the second sustain discharge waveform is switched to the first sustain discharge waveform and applied to the sustain discharge period. And
When the temperature drops, when the temperature detected by the temperature detection means becomes lower than the switching temperature T2, the first sustain discharge waveform is switched to the second sustain discharge waveform and applied to the sustain discharge period. A method of driving a plasma display panel.

Images