JP2010050047A - Plasma display panel - Google Patents

Abstract

A pulse voltage waveform having a leading edge pulse of a high voltage is applied between a pair of display electrodes without requiring a change of a driving circuit, thereby enabling high-efficiency and high-luminance maintenance driving.
A discharge space is provided between a front glass substrate provided with a plurality of display electrode pairs each composed of a scanning electrode and a sustain electrode and a front-side dielectric layer on the front glass substrate, and the front glass substrate. The back electrode 8 is provided with a data electrode 10 that three-dimensionally intersects with the display electrode pair and a partition wall 12 that partitions a discharge space, and a phosphor layer 13 is provided between the partition walls. It is driven by an address period for selecting a discharge cell as a light emission target and a sustain period for generating a sustain discharge by applying a sustain pulse voltage to the display electrode pair of the selected discharge cell, and when the sustain pulse rises (falls) A magnetic member is disposed on at least one of the constituent elements of the front plate and the rear plate so that an over (under) chute due to ringing occurs.
[Selection] Figure 1

Description

  The present invention relates to a plasma display panel used for a wall-mounted television or a large monitor.

  FIG. 7 shows an example of the configuration of an AC surface discharge type plasma display panel (hereinafter also referred to as “panel”) that is representative of the AC type. In FIG. 7, the front plate 1 is formed on the surface of a front glass substrate 2 by arranging display electrode pairs 5 including scan electrodes 3 and sustain electrodes 4 that perform surface discharge in parallel. Scan electrode 3 and sustain electrode 4 are each composed of transparent electrodes 3a, 4a formed on the surface of front glass substrate 2, and bus electrodes 3b, 4b formed thereon. The bus electrodes 3b and 4b are made of, for example, silver (Ag) and a glass frit material as a binding material thereof. A front-side dielectric layer 6 is formed so as to cover the display electrode pair 5, and a protective film 7 is formed thereon.

  The back plate 8 has data electrodes 10 arranged in parallel on the surface of the back glass substrate 9 and is covered with a back side dielectric layer 11. A partition wall 12 is formed on the back side dielectric layer 11. The barrier ribs 12 have a cross-beam shape formed by vertical barrier ribs 12a formed extending in a direction parallel to the data electrodes 10 and horizontal barrier ribs 12b formed in a direction orthogonal thereto. A red (R) phosphor layer 13r, a green (G) phosphor layer 13g, and a blue (B) phosphor layer 13b corresponding to the data electrode 10 are provided on the side surface of the barrier rib 12 and the surface of the back side dielectric layer 11. (Also collectively referred to as “phosphor layer 13”) is formed by coating.

  The front plate 1 and the back plate 8 are coupled so that the display electrode pair 5 and the data electrode 10 face each other so as to form a matrix. A discharge space 14 is formed in the gap between the front plate 1 and the back plate 8. And the outer peripheral part of the front board 1 and the back board 8 is sealed by sealing materials, such as glass frit (not shown), and the discharge gas which consists of mixed gas of neon (Ne) and xenon (Xe) is enclosed. ing. For example, a discharge gas having a Xe ratio of 10% is used, and the discharge gas is sealed at a pressure of about 450 Torr (about 60 kPa). Discharge cells 15 partitioned by the barrier ribs 12 are formed in the discharge space 14 where the display electrode pair 5 and the data electrode 10 intersect three-dimensionally. A black stripe 16 is formed between the display electrode pair 5 of the front plate 1 so as to face the upper part of the horizontal partition wall 12b. Although illustration is omitted, vertical black stripes are also formed in the vertical direction.

  FIG. 8 is an electrode array diagram of the panel. N scan electrodes SCN1 to SCNn (scan electrode 3 in FIG. 7) and n sustain electrodes SUS1 to SUSn (sustain electrode 4 in FIG. 7) are alternately arranged in the row direction, and m data electrodes in the column direction. D1 to Dm (data electrode 10 in FIG. 7) are arranged. A discharge cell Cij (discharge cell 15 in FIG. 7) is formed at a portion where a pair of scan electrode SCNi and sustain electrode SUSi (i = 1 to n) and one data electrode Dj (j = 1 to m) intersect. Therefore, the number of discharge cells 15 is (m × n).

  In the panel having such a structure, ultraviolet light is generated by gas discharge, and the phosphor layer 13 of each color of R, G, and B is excited by the generated ultraviolet light to emit light, thereby performing color display. In this panel, one field period is divided into a plurality of subfields (hereinafter abbreviated as “SF”), and gradation display is performed by a combination of SFs to emit light. Each SF has a predetermined luminance weight. Each SF has an initialization period, a writing period, and a sustain period. In order to display image data, different signal waveforms are applied to each electrode in the initialization period, the writing period, and the sustain period.

  In the initialization period, for example, positive and negative voltages are applied to all the scan electrodes 3, and the protective film 7 on the front-side dielectric layer 6 covering the scan electrodes 3 and the sustain electrodes 4 and the phosphor layer 13 are applied. Accumulate the necessary wall charges. In the writing period, scanning is performed in which negative scanning pulses are sequentially applied to all the scanning electrodes 3. When there is data to be displayed, if a positive data pulse is applied to the data electrode 10 while scanning the scan electrode 3, a discharge occurs between the scan electrode 3 and the data electrode 10, and the scan electrode 3 Discharge also occurs between the sustain electrodes 4. Thus, an address discharge occurs. As a result, wall charges are formed on the surface of the protective film 7 on the scan electrode 3 and the sustain electrode 4.

  In the subsequent sustain period, a sustain pulse as shown in FIG. 9A is applied to scan electrode 3 or sustain electrode 4 to maintain a discharge between scan electrode 3 and sustain electrode 4 for a certain period. Apply sufficient voltage. As a result, in the discharge cell to which the data pulse is applied during the writing period, a sustain discharge as shown in FIG. 9B occurs between the scan electrode 3 and the sustain electrode 4 to generate ultraviolet rays. The generated ultraviolet light causes the phosphor layer 13 to emit light. In the discharge cell 15 to which no data pulse is applied during the writing period, no sustain discharge occurs and excitation light emission of the phosphor layer 13 does not occur. The luminance of light emission is determined by the sustain pulse voltage Vsus and the number of sustain pulses.

  By the way, as the screen of a panel becomes larger and the definition becomes higher, it is required to improve the light emission efficiency of the panel and improve the luminance. For example, Patent Document 1 or Patent Document 2 describes a pulse shape between a pair of display electrodes that generates a single sustain discharge as a leading edge pulse having a short time and a high potential difference and a main body pulse having a long time and a low potential difference. It has been disclosed to drive a sustain pulse with high efficiency and high brightness by using a combined pulse shape.

  Normally, when the sustain pulse is driven with a rectangular pulse, the light emission efficiency increases as the sustain pulse voltage decreases. On the other hand, the emission luminance increases as the sustain pulse voltage increases. Therefore, if the sustain pulse voltage is lowered to increase the light emission efficiency, the light emission luminance is lowered. If the sustain pulse voltage is increased to increase the light emission luminance, the light emission efficiency is lowered.

  On the other hand, in the case where the pulse shape as disclosed in Patent Documents 1 and 2 is applied, the light emission efficiency is higher as the voltage of the main body pulse is lower, but hardly depends on the voltage of the leading edge pulse. Even if the voltage of the main body pulse is low, the light emission luminance is increased by increasing the leading edge pulse voltage. Therefore, the light emission efficiency can be increased by reducing the voltage of the main body pulse as much as possible, and the light emission luminance can be increased by increasing the voltage of the leading edge pulse. With this configuration, it is possible to drive sustain pulses with high efficiency and high brightness.

This effect is achieved by effectively increasing the growth of the discharge by applying a high voltage in the early stage of the discharge growth in the discharge cell, and the electric field in the plasma state in the state where the discharge is grown. This is achieved by reducing the power consumed as the kinetic energy of ions by weakening the energy.
Japanese Patent Laid-Open No. 10-333635 JP 11-352927 A

  In order to make the voltage applied between the display electrode pair at the time of the sustain discharge into a pulse shape combining the leading edge pulse with a short time and a high potential difference as described above and the main body pulse with a long time and a low potential difference, Patent Document 1 describes a configuration in which a high voltage in the leading edge pulse portion and a low voltage in the main body pulse portion are applied between the electrodes. Further, Patent Document 2 describes a drive circuit for generating a waveform having an overshoot at the leading edge portion. The overshoot waveform forms a leading edge pulse with a short time and high potential difference.

  However, when a sustain pulse waveform as in Patent Document 1 is applied, a drive circuit that outputs the waveform is a drive circuit for generating a leading edge pulse with a short time and a high potential difference, and a drive circuit that generates a long potential with a low potential difference. Since two types of driving circuits for generating the main body pulse are required, the driving circuit is complicated and the number of parts increases.

  Further, as in Patent Document 2, when a drive waveform for obtaining the above effect is generated by a drive circuit, it is necessary to increase the breakdown voltage of the switch element in order to increase the voltage at the rising edge of the pulse. Increases the number of parts. That is, when the maximum absolute rating between the drain and source of the switch element is increased, the resistance value per the same chip area increases. Therefore, in order to pass the same level of current, it is necessary to increase the number of switch elements connected in parallel, which increases the number of circuit components.

  The present invention can drive a high-efficiency and high-intensity sustain pulse by applying a pulse voltage waveform having a high-voltage leading edge pulse between display electrode pairs without changing the configuration of the drive circuit. An object of the present invention is to provide a possible plasma display panel.

  It is another object of the present invention to provide a driving method utilizing such characteristics of the plasma display panel.

  The plasma display panel of the present invention is a front plate in which a plurality of display electrode pairs composed of scan electrodes and sustain electrodes are arranged on a front glass substrate and a front-side dielectric layer is provided so as to cover the display electrode pairs. And a plurality of data electrodes on the rear glass substrate disposed opposite to each other so as to form a discharge space between the front glass substrate and the display electrode pair. A discharge cell is formed at each intersection of the display electrode pairs, and a partition plate for partitioning the discharge space is formed and a phosphor plate is provided between the partition walls, and a discharge cell for emitting light is selected. An address period to be driven, and a sustain period for generating a sustain discharge by applying a sustain pulse voltage to the display electrode pair of the discharge cell selected in the address period, And at least one of the components of the front plate and the back plate so that overshoot or undershoot due to ringing occurs at the rise or fall of the sustain pulse for generating the sustain discharge. In addition, a magnetic member is arranged.

  According to the plasma display panel having the above configuration, ringing is likely to occur when a rectangular sustain pulse is applied from the drive circuit to the display electrode pair due to an increase in inductance of the components of the panel. In addition, the ringing peak value increases. As a result, the voltage applied to the discharge space is the same as when the drive pulse waveform having a high-voltage leading edge pulse is applied because the rising voltage is higher than the sustain pulse voltage applied from the drive circuit. An effect is obtained. Since the drive waveform at the connection portion between the panel and the drive circuit is not different from the normal waveform, it is possible to apply the sustain pulse with high efficiency and high brightness without increasing the number of parts of the drive circuit.

  The plasma display panel of the present invention can take the following aspects based on the above-described configuration.

  That is, a magnetic member can be disposed on the partition wall.

  Further, a black stripe can be provided at each boundary portion of the discharge cell, and a magnetic member can be arranged on the black stripe.

  Further, the display electrode pair of the front plate can be constituted by a transparent electrode and a bus electrode connected to the transparent electrode, and a magnetic member can be disposed on the upper surface portion of the bus electrode.

  The bus electrode may have a two-layer structure, and a magnetic member may be disposed on the upper layer portion of the bus electrode.

  The magnetic member may be composed of a metal oxide based magnetic material or a metal magnetic material.

  Also, it is preferable that the peak value of overshoot / undershoot due to ringing generated at the rise or fall of the sustain pulse is set to be 1.2 times or more the set voltage value of the sustain pulse voltage.

  Further, the steepness of the sustain pulse is made different according to the light emission luminance set for each discharge cell based on the display image, and the light emission luminance is controlled by the steepness at the rise or fall of the sustain pulse. Can do.

  In addition, it is possible to control so as to obtain the same luminance by reducing the number of sustain pulses and steep rising or falling of each pulse with respect to a predetermined luminance.

  In addition, the emission luminance can be controlled by combining the length of the sustain pulse with the length of the sustain pulse at the rise or fall of the sustain pulse for generating the sustain discharge.

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

(Embodiment 1)
FIG. 1 is a cross-sectional view showing the main part of the configuration of the plasma display panel according to Embodiment 1 of the present invention. The basic structure of this panel is the same as that of the panel shown in FIG. FIG. 1 shows a cross-sectional structure along the direction of the data electrode 10 in the discharge cell 15 of FIG. Accordingly, the same elements as those in FIG. 7 are denoted by the same reference numerals, and the description thereof will not be repeated. FIG. 2 is a plan view showing a planar configuration corresponding to FIG.

  The panel of the present embodiment is different from the conventional panel shown in FIG. 7 in that the vertical barrier ribs 20a and the horizontal barrier ribs 20b (both barrier ribs are collectively referred to as the barrier ribs 20). That is, the partition wall 20 is formed by dispersing a powdered magnetic material in its normal material (main material). The partition wall 20 is formed by firing a paste containing, for example, a low softening point glass frit and an organic binder, and a powdered magnetic material is dispersed and fired in the paste. Due to the powdery magnetic material, the inductance of each electrode is increased as compared with the case where the partition wall 20 is formed of only the main material. Thereby, for example, the inductance of the scan electrode 3 and the sustain electrode 4 is set to a predetermined value larger than that of the conventional case.

  As will be described later, the elements to which the powdered magnetic material is dispersed in order to obtain the effect of increasing the inductance are not limited to the partition wall 20, but the front glass substrate 2, the transparent electrodes 3a and 4a, the bus electrodes 3b and 4b, and the front surface. The effect of the present embodiment can be obtained by dispersing the powdered magnetic material in at least one of the side dielectric layer 6, the black stripe 16, and the vertical black stripe.

  The effect of increasing the inductance by dispersing the powdered magnetic material will be described with reference to FIG. 3V (a) to V (c) are waveform diagrams showing the voltage waveform of the sustain pulse applied during the sustain discharge and the action caused by the voltage waveform. FIG. 3S is a plan view showing a corresponding portion of the electrode of the panel for each potential difference shown in FIGS. 3V (a) to V (c).

  V (a) is a potential difference between the input end of scan electrode SCN1 and GND, V (b) is a potential difference between the end opposite to the input end of sustain electrode SUS1 and GND, and V (c) is a scan electrode. It is a figure which each shows the electric potential difference between the edge on the opposite side of the input terminal of SCN1, and the input terminal of sustain electrode SUS1. Here, V (a) -V (b) is a potential difference between the input end of SCN1 and the end opposite to the input end of SUS1, and has the same waveform as V (c).

  As described above, when the sustain discharge is generated, the sustain pulse voltage Vsus as shown in FIG. 3V (a) is applied to one of the scan electrode 3 and the sustain electrode 4. A ground potential GND is applied to the other electrode. As a result, a voltage necessary to maintain the discharge is applied between the scan electrode 3 and the sustain electrode 4 to generate a discharge. By applying the sustain pulse voltage Vsus as shown in FIG. 3V (a), the discharge current begins to flow with a delay of several tens of nanoseconds to several hundreds of nanoseconds from the pulse application, and further with a delay of several tens of nanoseconds to several hundreds of nanoseconds. And then ends for several tens of nanoseconds to several hundred nanoseconds.

  When such a sustain pulse is applied, ringing as shown in FIG. 3V (b) occurs due to resonance based on the inductance and panel capacitance of the panel electrode. In the present embodiment, since the powdery magnetic material is dispersed in the partition wall 20 to increase the inductance, ringing is likely to occur and the peak value of the ringing is increased. This ringing waveform is superimposed on the sustain pulse voltage Vsus of FIG. 3V (a), and the discharge space has a large overshoot at the leading edge portion of the sustain pulse waveform as shown in FIG. 3V (c). A voltage is applied.

  As a result, the voltage applied to the discharge space between the pair of display electrodes is such that the rising voltage is higher than the sustain pulse voltage applied from the drive circuit, and the sustain pulse waveform has a high voltage leading edge pulse. The same effect as that applied can be obtained, and it is possible to drive the sustain pulse with high efficiency and high brightness. Here, in FIG. 3, only the end between the display electrode pairs is shown, but the waveform of the sustain pulse including the ringing similar to the end between the display electrode pairs is applied between the display electrode pair at the center of each electrode. The

  An example of a ringing waveform that can be used in the present invention is shown in FIG. Such ringing has a practically sufficient effect of improving luminance when the peak value of the overshoot reaches 1.2 times or more the set voltage value of the sustain pulse voltage Vsus. As for the peak value of the overshoot, if a sustain discharge is generated in the discharge cell, the peak value becomes low due to the discharge current flowing at that time, so the sustain discharge is not generated. Determine as a reference.

  According to the present embodiment, only by changing the panel, the drive waveform applied from the drive circuit to the display electrode pair does not change from the normal waveform, so that it is not necessary to increase the number of components of the drive circuit. In addition, since neither the scan electrode 3 nor the sustain electrode 4 has an overshoot in the voltage applied from the drive circuit, the withstand voltage of the switch used in the drive circuit may be low.

  In the present embodiment, the magnetic material dispersed as a powder in the elements of the panel includes soft magnetic materials such as iron, silicon steel, permalloy, sendust, permendur, soft ferrite, amorphous magnetic alloy, and nanocrystal magnetic alloy. Etc. can be used. Among these, metals other than soft ferrite are metallic magnetic bodies and exhibit a metallic color with metallic luster. The soft ferrite that is a metal oxide system exhibits a black color. Depending on the difference in color and application location, it is desirable to use them as follows.

  In order to obtain a significant effect on sustain discharge, the magnetic powder is dispersed on the front glass substrate, transparent electrode, bus electrode, front dielectric layer, black stripe, vertical black stripe, and barrier ribs in consideration of the following points. .

  (1) It is important that the front glass substrate, the transparent electrode, and the front dielectric layer are transparent. When a large amount of the magnetic material is dispersed in these elements, the transparency is lowered, the emission of light emission to the outside of the panel is prevented, and the brightness of the panel is lowered. Therefore, the dispersion amount is desirably small.

  (2) When a metal magnetic material is dispersed in black stripes and vertical black stripes, the amount is made small. This is because when the gloss of the metal magnetic material acts, the antireflection effect is inhibited. On the other hand, when soft ferrite is dispersed, a large amount can be used. This is because it has a black color and has an antireflection effect.

  (3) When the metal magnetic material is dispersed in the partition walls, a large amount can be used. This is because if there is a metallic luster, there is a reflection effect, so that the phosphor light can be sufficiently emitted from the front glass substrate. On the other hand, when soft ferrite is dispersed, the amount is made small. This is because the reflection effect is reduced when black, so that the phosphor light cannot be sufficiently emitted from the front glass substrate.

  (4) A small amount is used when the metal magnetic material is dispersed on the upper surface of the bus electrode. This is because when the metallic luster acts, the antireflection effect is lost. On the other hand, when soft ferrite is dispersed, a large amount can be used. This is because the effect of suppressing reflection is obtained because of the black color.

  (5) When the metal magnetic material is dispersed on the lower surface of the bus electrode, a large amount of use is possible. This is because if the metallic luster is present, the reflection effect is large, and light emission can be sufficiently extracted from the front glass substrate by multiple reflection. When dispersing soft ferrite, use a small amount. This is because the effect of taking out light emission from the front glass substrate is low because the reflection effect is low when black.

  On the other hand, by dispersing the magnetic powder in the elements of the panel, an effect can be obtained for the write discharge. For that purpose, it is applied to the rear glass substrate, the partition walls, the data electrode, or the rear dielectric layer. When a metal magnetic material is dispersed in these elements, a large amount can be used. This is because if the metallic luster is present, the reflection effect is large, so that the phosphor light can be sufficiently emitted from the front glass substrate. When dispersing soft ferrite, use a small amount. This is because the light from the phosphor cannot be sufficiently emitted from the front glass substrate because it is not reflected when it is black.

(Embodiment 2)
FIG. 5A is a cross-sectional view showing the main part of the configuration of the plasma display panel according to Embodiment 2 of the present invention. The basic configuration of this panel is the same as that of the panel shown in FIG. FIG. 1 shows a cross-sectional structure along the direction of the data electrode 10 in the discharge cell 15 of FIG. Accordingly, the same elements as those in FIG. 7 are denoted by the same reference numerals, and the description thereof will not be repeated.

  The panel of the present embodiment is different from the panel of the conventional example shown in FIG. 7 in that a magnetic layer 21 is laminated on the vertical barrier ribs 12a and the horizontal barrier ribs 12b. Thereby, as in the case of the first embodiment, the inductance of each electrode is increased. Thereby, for example, the inductance of the scan electrode 3 and the sustain electrode 4 is set to a predetermined value larger than that of the conventional case.

  Due to the increase in inductance as described above, as in the case of the first embodiment, ringing is likely to occur due to resonance based on the inductance and panel capacitance by the panel electrode, and the peak value of the ringing becomes large. Therefore, a voltage having a large overshoot at the leading edge portion of the sustain pulse waveform is applied to the discharge space. As a result, the voltage applied to the discharge space between the pair of display electrodes is such that the rising voltage is higher than the sustain pulse voltage applied from the drive circuit, and the sustain pulse waveform has a high voltage leading edge pulse. The same effect as that applied can be obtained, and it is possible to drive the sustain pulse with high efficiency and high brightness.

  Similar effects can be obtained in the same manner by a configuration in which the magnetic layer 22 is laminated below the partition wall 12 as shown in FIG. 5B. Further, although not shown, a configuration in which both the upper magnetic layer 21 and the lower magnetic layer 22 of the partition wall 12 may be used.

  The elements for which the magnetic layer is laminated in order to obtain the effect of increasing the inductance are not limited to the barrier ribs 12, but the back glass substrate 9, the bus electrodes 3a and 4a, and the black stripes and data provided at the boundaries of the discharge cells. By targeting at least one of the electrode 10 and the back-side dielectric layer 11, the effect of the present embodiment can be obtained.

  In order to obtain a significant effect on the sustain discharge, a magnetic layer is laminated on the bus electrode, black stripe, and partition wall in consideration of the following points. Here, when laminating metal magnetic material and soft ferrite, metal magnetic material and soft ferrite are not insulators because many substances are not insulators. It cannot be applied to an arrangement in which the electrodes are short-circuited, for example, a vertical black stripe. Further, in the case of showing conductivity when laminated, the black stripe and the display electrode are arranged so as not to contact each other.

  (1) A magnetic layer made of a metal magnetic material is formed under the bus electrode, under the black stripe, and under the vertical black stripe. However, the metal magnetic material used for the vertical black stripe is assumed to have low conductivity.

  (2) A magnetic layer made of soft ferrite is formed on the upper part of the bus electrode, the upper part of the black stripe, the upper part of the vertical black stripe, and the upper part of the partition wall. Instead of laminating the magnetic layer on the black stripe, the black stripe and the vertical black stripe may be formed of only the black soft ferrite layer. However, the soft ferrite used for the vertical black stripe has low conductivity.

  On the other hand, in order to obtain a great effect on the address discharge, a magnetic layer is laminated on the rear glass substrate, the partition walls, the data electrodes, and the rear dielectric layer in consideration of the following points.

  (1) A magnetic layer made of a metal magnetic material is formed on the rear glass substrate, the lower part of the partition, the data electrode (upper / lower), and the rear dielectric layer. However, the metal magnetic material used for the surface of the back glass substrate and the surface of the back dielectric is assumed to have low conductivity.

  (2) A magnetic layer made of soft ferrite is formed below the data electrode.

(Embodiment 3)
A method for driving the plasma display panel according to Embodiment 3 will be described with reference to FIG. FIG. 6 shows examples of the waveform of the sustain pulse and the waveform of the voltage applied to the discharge space. (A) When the rise of the sustain pulse is slow, (b) When the rise of the sustain pulse is intermediate (c) Each of the cases where the rise is steep is shown.

  The driving method of this embodiment is a method suitable for driving a panel having the configuration of the first or second embodiment. Similar to the driving method of the conventional example, one field is written by applying an initializing period for generating an initializing discharge in the discharge cell, an addressing period for generating an addressing discharge in the discharge cell, and applying a sustain pulse to the display electrode pair. A plurality of subfields each having a sustain period in which a sustain discharge is generated in a discharge cell that has generated a discharge.

  As a basic condition, the driving method according to the present embodiment, in combination with the panel having the configuration of the first or second embodiment, the voltage applied to the discharge space between the pair of display electrodes has sufficient overshoot. It is set so that the rise of the sustain pulse is steep so as to occur. However, in principle, the steepness obtained with the same configuration as the conventional one is sufficient.

  Furthermore, in the driving method according to the present embodiment, as shown in FIGS. 6A, 6B, and 6C, the rising and falling of the sustain pulse waveform is caused to have a gradual difference. The ringing peak value generated in the voltage applied to the discharge space changes according to the rise and fall of the sustain pulse. That is, if the sustain pulse waveform is slow as shown in the left column of (a), there is almost no ringing peak value as shown in the right column, and as a result, the emission luminance is lowest. On the other hand, if the sustain pulse waveform is intermediate as shown in the left column of (b), the peak value of ringing is small as shown in the right column, and as a result, the emission luminance is lowered. On the other hand, if the sustain pulse waveform is steep as shown in the left column of (c), the peak value of ringing increases as shown in the right column, and as a result, the emission luminance increases.

  Therefore, it is possible to control the luminance of the emitted light by adjusting the sustain pulse waveform, and it is possible to adjust the gradation performance by a method other than changing the number of pulses in the subfield method by combining according to the image signal. Can be improved.

  Alternatively, even if the number of pulses is reduced with respect to a predetermined luminance, the same luminance can be obtained by making the sustain pulse steep, so that reactive power can be reduced.

(Embodiment 4)
The driving method of the plasma display panel in the fourth embodiment is basically the same as the driving method in the third embodiment. In the driving method of the present embodiment, in addition to the rise and fall of the sustain pulse waveform as in the third embodiment, the emission luminance is controlled by combining the lengths of the sustain pulse periods.

  That is, if the period of the sustain pulse is lengthened, the interval between discharges becomes longer, so that the priming particles are attenuated. For this reason, the discharge delay is increased, and the discharge is performed after the ringing of the pulse waveform is settled, resulting in lower luminance. Thereby, it is possible to achieve a low luminance equivalent to the case where the sustain pulse waveform is the gradual.

  In addition, for example, when the sustain pulse waveform is adapted to an intermediate or steepest waveform, by making the sustain pulse period an appropriate length, the discharge is shifted slightly behind the ringing peak value, By making the light emission smaller than the light emission at the peak value, the light emission luminance can be controlled to an appropriate level.

  As described above, according to the driving method of the present embodiment, in contrast to the method of the third embodiment, the gradation corresponding to the image signal other than lowering the number of pulses in the subfield expressing the low gradation. Can be easily attached, and gradation performance can be improved.

  According to the plasma display panel of the present invention, it is possible to drive a sustain pulse with high efficiency and high brightness, which is useful as a wall-mounted television or a large monitor.

Sectional drawing which shows the principal part of the structure of the plasma display panel in Embodiment 1 The top view which shows the plane structure of the principal part corresponding to FIG. V (a) to V (c) are voltage waveforms of sustain pulses applied at the time of sustain discharge and waveform diagrams showing the action thereof, and (S) is for each potential difference shown in V (a) to V (c). The top view which shows the corresponding | compatible site | part in the electrode of a panel Waveform diagram showing an example of a ringing waveform generated in the plasma display panel of the first embodiment Sectional drawing which shows the principal part of the structure of the plasma display panel in Embodiment 2. Sectional drawing which shows the principal part of the other structure of the plasma display panel in Embodiment 2. FIG. 6 is a waveform diagram showing an example of the sustain pulse waveform and the waveform of the voltage applied to the discharge space by the plasma display panel driving method of the third embodiment. Perspective view showing the structure of a general plasma display panel Electrode arrangement of the panel Waveform diagram showing sustain pulse waveform and emission waveform corresponding to sustain pulse

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front plate 2 Front glass substrate 3 Scan electrode 3a, 4a Transparent electrode 3b, 4b Bus electrode 4 Sustain electrode 5 Display electrode pair 6 Front side dielectric layer 7 Protective film 8 Back plate 9 Back glass substrate 10 Data electrode 11 Back side dielectric Body layers 12, 20 Partition walls 12a, 20a Vertical partition walls 12b, 20b Horizontal partition walls 13 Phosphor layer 13r Red (R) phosphor layer 13g Green (G) phosphor layer 13b Blue (B) phosphor layer 14 Discharge space 15 Discharge cell 16 Black stripe 21, 21 Magnetic layer

Claims (10)

On the front glass substrate, a front plate formed by arranging a plurality of display electrode pairs consisting of scan electrodes and sustain electrodes and having a front-side dielectric layer so as to cover the display electrode pairs, and the front glass substrate A plurality of data electrodes are formed on the rear glass substrate disposed opposite to each other so as to form a discharge space therebetween, and three-dimensionally intersect with the display electrode pair, and at the intersection of the data electrode and the display electrode pair. A back plate having a phosphor layer between the barrier ribs and forming barrier ribs each forming discharge cells and partitioning the discharge space;
An address period for selecting a discharge cell for light emission and a sustain period for generating a sustain discharge by applying a sustain pulse voltage to the display electrode pair of the discharge cell selected in the address period are driven. Of the front plate and the back plate so that overshoot or undershoot due to ringing occurs at the rise or fall of the sustain pulse for generating the sustain discharge. A plasma display panel, wherein at least one magnetic member is disposed.   The plasma display panel according to claim 1, wherein a magnetic member is disposed on the partition wall.   The plasma display panel according to claim 1, wherein a black stripe is provided at each boundary portion of the discharge cell, and a magnetic member is disposed on the black stripe.   The plasma display panel according to claim 1, wherein the display electrode pair of the front plate is constituted by a transparent electrode and a bus electrode connected to the transparent electrode, and a magnetic member is disposed on an upper surface portion of the bus electrode.   The plasma display panel according to claim 4, wherein the bus electrode has a two-layer structure, and a magnetic member is disposed on an upper layer portion of the bus electrode.   6. The plasma display panel according to claim 2, wherein the magnetic member is made of a metal oxide magnetic material or a metal magnetic material.   2. The plasma display according to claim 1, wherein a peak value of overshoot / undershoot due to ringing generated at the rising or falling of the sustain pulse is set to be 1.2 times or more of a set voltage value of the sustain pulse voltage. panel.   The light emission luminance is controlled by varying the steepness of the sustain pulse in accordance with the light emission luminance set for each discharge cell based on a display image, and by the steepness at the rise or fall of the sustain pulse. 2. A plasma display panel according to 1.   2. The plasma display panel according to claim 1, wherein control is performed so as to obtain the same brightness by reducing the number of sustain pulses and steep rising or falling of each pulse with respect to a predetermined brightness.   2. The plasma display panel according to claim 1, wherein the light emission luminance is controlled by combining the length of the sustain pulse with the length of the sustain pulse at the rise or fall of the sustain pulse for generating the sustain discharge. .

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