JP4569136B2 - Driving method of plasma display panel - Google Patents

Description

  The present invention relates to a method for driving a plasma display panel used for a wall-mounted television, a large monitor, or the like.

  A plasma display panel (hereinafter abbreviated as PDP or panel) is a display device with excellent visibility characterized by a large screen, a thin shape, and a light weight.

  A typical AC surface discharge type panel as a PDP has a large number of discharge cells formed between a front plate and a back plate arranged to face each other. The front plate is formed with a plurality of pairs of display electrodes composed of scan electrodes and sustain electrodes on the front glass substrate in parallel with each other, and a dielectric layer and a protective layer are formed so as to cover the display electrodes. The back plate has a plurality of parallel data electrodes on the back glass substrate, a dielectric layer so as to cover them, and a plurality of partition walls formed in parallel to the data electrodes on each of the dielectric layers. A phosphor layer is formed on the side surface of the partition wall. Then, the front plate and the back plate are arranged opposite to each other so that the display electrode and the data electrode are three-dimensionally crossed and sealed, and a discharge gas is sealed in the internal discharge space. In the panel having such a configuration, ultraviolet light is generated by gas discharge in each discharge cell, and phosphors of RGB colors are excited and emitted by the ultraviolet light to perform color display.

  As a method of driving the panel, a subfield method, that is, a method of performing gradation display by combining subfields to emit light after dividing one field period into a plurality of subfields. Here, each subfield has an initialization period, an address period, and a sustain period.

  In the initializing period, initializing discharge is simultaneously performed in all the discharge cells, the history of wall charges for the individual individual discharge cells is erased, and wall charges necessary for the subsequent address operation are formed. In addition, it has a function of generating priming (priming for discharge = excited particles) for reducing the discharge delay and stably generating the address discharge. In the address period, a scan pulse is sequentially applied to the scan electrode, an address pulse corresponding to an image signal to be displayed is applied to the data electrode, and an address discharge is selectively performed between the scan electrode and the data electrode. Selective wall charge formation is performed. In the subsequent sustain period, a predetermined number of sustain pulses are applied between the scan electrodes and the sustain electrodes, and the discharge cells in which the wall charges are formed by the address discharge are selectively discharged to emit light.

  Thus, in order to display an image correctly, it is important to reliably perform selective address discharge in the address period. However, due to restrictions on the circuit configuration, a high voltage cannot be used for the address pulse, There are many factors that increase the discharge delay with respect to the address discharge, such as making it difficult for the phosphor layer formed on the electrode to discharge. Therefore, priming for generating the address discharge stably is very important.

  However, the priming caused by the discharge decreases rapidly with time. For this reason, in the above-described panel driving method, the address discharge after a long time has passed from the initialization discharge, the priming caused by the initialization discharge is insufficient, the discharge delay becomes large, and the address operation becomes unstable. There has been a problem that the image display quality deteriorates. Alternatively, there is a problem in that the writing time is set long in order to perform the writing operation stably, and as a result, the time spent in the writing period becomes too long.

In order to solve these problems, a panel and a driving method thereof have been proposed in which priming is generated by using priming discharge cells provided on the front plate of the panel to reduce the discharge delay (for example, Patent Document 1).
JP 2002-150949 A

  In recent years, in order to meet demands for reducing power consumption and improving brightness, panel structures and panel materials have been actively studied. For example, it is generally known that the luminous efficiency of the panel is improved by increasing the xenon partial pressure of the discharge gas sealed in the panel. However, in the above-described panel and its driving method, if the xenon partial pressure is increased, the discharge, particularly the initializing discharge, becomes unstable, and as a result, there is a possibility that a write failure may occur, so that the drive voltage margin for the write operation is narrow. There was a problem of becoming.

  The present invention has been made in view of these problems, and an object of the present invention is to provide a method for driving a plasma display panel that can stabilize an initializing discharge and display an image with good quality.

  The plasma display panel driving method of the present invention includes a first substrate, a plurality of display electrode pairs including scan electrodes and sustain electrodes arranged in parallel on the first substrate, and a first across the discharge space. A second substrate disposed opposite to the substrate, a plurality of data electrodes disposed on the second substrate in a direction intersecting with the display electrode pair, and between the first substrate and the second substrate. A method for driving a plasma display panel comprising a main discharge cell for generating discharge and a partition provided so as to partition a priming discharge cell for generating priming discharge, wherein one field has an initialization period, an address period, and a sustain period The scan electrode in the main discharge cell is positively connected during the initialization period of at least one subfield of the plurality of subfields. And applying were voltage for generating the discharge scanning electrodes as a cathode data electrodes as an anode in priming discharge cell before generating the discharge sustain electrodes as the cathode to the data electrodes and. With this driving method, it is possible to stabilize the initialization discharge of the plasma display panel and display an image with good quality.

  Further, the driving method of the plasma display panel of the present invention includes a first substrate, a plurality of display electrode pairs including scan electrodes and sustain electrodes arranged in parallel on the first substrate, and a discharge space interposed therebetween. A second substrate disposed opposite to the first substrate; a plurality of data electrodes disposed on the second substrate in a direction intersecting the display electrode pair; and the first substrate and the second substrate. A plasma display panel driving method comprising: a main discharge cell that generates a main discharge; and a barrier rib provided so as to partition a priming discharge cell that generates a priming discharge. A plurality of subfields having a sustain period, and scanning power in the main discharge cell is set in an initialization period of at least one of the plurality of subfields. The voltage may be applied to the sustain electrode for the scanning electrodes in the priming discharge cell generates a discharge as a cathode data electrode as an anode before generating a discharge as a cathode and the sustain electrode as an anode. This driving method can also stabilize the initializing discharge of the plasma display panel and display an image with good quality.

  According to the present invention, it is possible to provide a driving method of a plasma display panel that can stabilize an initializing discharge and display an image with good quality.

  Hereinafter, a panel according to an embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is an exploded perspective view showing the structure of the panel according to Embodiment 1 of the present invention, and FIG. 2 is a sectional view of the panel. A glass front substrate 21 which is a first substrate and a rear substrate 31 which is a second substrate are arranged opposite to each other with a discharge space interposed therebetween, and a mixed gas of neon and xenon which emits ultraviolet rays by discharge in the discharge space. Is enclosed.

  On the front substrate 21, a plurality of display electrode pairs composed of the scan electrodes 22 and the sustain electrodes 23 are formed in parallel to each other. At this time, the scan electrodes 22 and the sustain electrodes 23 are alternately arranged two by two so as to be a sustain electrode 23 -a scan electrode 22 -a scan electrode 22 -a sustain electrode 23-. Scan electrode 22 and sustain electrode 23 are each composed of transparent electrodes 22a and 23a and metal bus bars 22b and 23b formed on transparent electrodes 22a and 23a, respectively. A light absorption layer 28 made of a black material is provided between scan electrode 22 and scan electrode 22 and between sustain electrode 23 and sustain electrode 23. The protruding portion 22 b ′ of the metal bus 22 b of the scanning electrode 22 is formed so as to protrude onto the light absorption layer 28. A dielectric layer 24 and a protective layer 25 are formed so as to cover the scan electrode 22, the sustain electrode 23, and the light absorption layer 28.

  On the back substrate 31, a plurality of data electrodes 32 are formed in parallel to each other in a direction crossing the scan electrodes 22 and the sustain electrodes 23, and a dielectric layer 33 is formed so as to cover the data electrodes 32. A partition wall 34 for partitioning the main discharge cell 40 is formed on the dielectric layer 33.

  The partition wall 34 includes a vertical wall portion 34 a extending in a direction parallel to the data electrode 32, and a horizontal wall portion 34 b that forms the main discharge cell 40 and forms a gap portion 41 between the main discharge cells 40. As a result, the barrier ribs 34 form a main discharge cell row in which a plurality of main discharge cells 40 are connected along a display electrode pair including a pair of scan electrodes and sustain electrodes, and a gap 41 is formed between adjacent main discharge cell rows. Produce. A protruding portion 22b 'is formed in the gap portion of the gap portion 41 on the side where the two scanning electrodes are adjacent to each other, and this gap portion functions as the priming discharge cell 41a. That is, the gap 41 is a priming discharge cell 41a having every other protruding portion 22b '. The gap 41b is a gap located on the side where two sustain electrodes are adjacent.

  The tops of the partition walls 34 are formed flat so as to contact the front substrate 21. This is to prevent mutual interference between adjacent discharge cells, and in particular to prevent malfunction such as erroneous writing due to the influence of priming that occurs due to the address discharge of the adjacent discharge cells in the address period. Furthermore, this is to prevent malfunction such as a write failure due to a decrease in wall charges of the main discharge cell 40 adjacent to the priming discharge cell 41a accompanying the priming discharge. In the first embodiment of the present invention, the partition wall 34 is formed to have a step of 10 μm or less. This value is a value based on the experimental result that, if it exceeds 10 μm, mutual interference between adjacent main discharge cells 40 occurs, and mutual interference between the priming discharge cell 41a and the main discharge cell 40 also occurs.

A phosphor layer 35 is provided on the surface of the dielectric layer 33 corresponding to the main discharge cells 40 partitioned by the barrier ribs 34 and on the side surfaces of the barrier ribs 34. Furthermore, an electron emission layer 39 using magnesium oxide (MgO) powder is provided on the surface of the dielectric layer 33 corresponding to the priming discharge cell 41 a and the side surfaces of the partition walls 34. The material of the electron emission layer 39 may be a material having a large secondary electron emission coefficient, and other metal oxides such as Y ₂ O ₃ , La ₂ O ₃ , CeO ₂ , Er ₂ O ₃ , and Lu ₂ O. ₃ or (La, M1) M2O ₃ (where M1 is Ba or Sr, M2 is any one of Co, Ni, Fe, and Mn), and (La, M1) ₂ M3O ₄ (although, M1 is Ba or Sr, M3 is Cu or Ni) may be such as those having a _K 2 NiF ₄ -type structure represented by.

  In the above description, the dielectric layer 33 is formed so as to cover the data electrode 32. However, the dielectric layer 33 may not be formed.

FIG. 3 is an electrode array diagram of the panel according to Embodiment 1 of the present invention. M columns of data electrodes D _{1 to} D _m (data electrodes 32 in FIG. 1) are arranged in the column direction, and n rows of scan electrodes SC _{1 to} SC _n (scan electrodes 22 in FIG. 1) and n rows of data electrodes are arranged in the row direction. sustain electrodes _SU 1 to SU _n (sustain electrodes 23 in FIG. 1) and the sustain electrodes SU ₁ - scan electrode SC ₁ - scan electrode SC ₂ - sustain electrode _SU 2 - · · · and so as to alternately arranged two by two Has been. In the first embodiment of the present invention, priming discharge is performed between the protruding portions (protruding portions 22b ′ in FIG. 1) of the adjacent scan electrodes SC _p and SC _{p + 1} (p = odd number).

A main discharge cell C _{i, j} (a main discharge in FIG. 1) including a pair of scan electrodes SC _i , sustain electrodes SU _i (i = 1 to n) and one data electrode D _j (j = 1 to _m ). M × n cells 40) are formed in the discharge space. Further, a priming discharge cell PS _p (priming discharge cell 41a in FIG. 1) including protruding portions of adjacent scan electrodes SC _p and SC _{p + 1} is formed.

  Next, driving waveforms and timing for driving the panel will be described together with the operation of the panel.

  FIG. 4 is a drive waveform diagram of the panel in accordance with the first exemplary embodiment of the present invention. As described above, in the first embodiment, one field period is composed of a plurality of subfields having an initialization period, an address period, and a sustain period. The address period is an odd-numbered scan electrode (hereinafter referred to as an odd-number scan electrode). An odd line address period for performing an address operation of a main discharge cell having an abbreviation) and an even line address period for performing an address operation of a main discharge cell having an even number of scan electrodes (hereinafter abbreviated as even scan electrodes); The write operation of the odd-numbered scan electrode and the even-numbered scan electrode is performed with time separation. This is because the priming discharge is successively and stably generated using the wall charges.

First, in the half of the initializing period, a negative voltage Vx (V) is applied to data electrodes _D 1 to D _m, sustain electrodes _SU 1 to SU _n are kept 0 (V), the scan electrodes _SC 1 to SC _n is applied to the sustain electrodes SU _{1 to} SU _n with a ramp waveform voltage that gradually increases from the voltage Vi _{1 that is} equal to or lower than the discharge start voltage toward the voltage Vi ₂ that exceeds the discharge start voltage. In main discharge cell C _{i, j} and priming discharge cell PS _i , while this ramp waveform voltage rises, scan electrodes SC _{1 to} SC _n , sustain electrodes SU _{1 to} SU _n , and data electrodes D _{1 to} D _m 1st weak initializing discharge occurs between each.

At this time, before the discharge occurs in the main discharge cell C _{i, j} , first, the weakness is generated between the scan electrodes SC _{1 to} SC _n and the data electrodes D _{1 to} D _m in the priming discharge cell PS _i . Priming discharge occurs. The discharge at this time is a stable discharge with a small discharge delay due to the action of the electron emission layer 39. Then, priming is supplied into the main discharge cells C _{i, j} . Subsequently, in the main discharge cells C _{i, j} , weak initializing discharge occurs between the scan electrodes SC _{1 to} SC _n , the sustain electrodes SU _{1 to} SU _n , and the data electrodes D _{1 to} D _m , respectively. Discharge main discharge cells C _i at this _time, a very stable initializing discharge to occur after priming is supplied into _j.

Negative wall voltage is accumulated on scan electrodes _SC 1 to SC _n top, to the data electrodes _D 1 to D _m and sustain electrodes _SU 1 to SU _n positive wall voltage is accumulated. Here, the wall voltage at the top of the electrode represents a voltage generated by wall charges accumulated on the dielectric layer or the phosphor layer covering the electrode.

In the second half of the initializing period, data electrodes _D 1 to D _m kept 0 (V), a positive voltage Ve is applied to sustain electrodes _SU 1 to SU _n, the scan electrodes _SC 1 to SC _n, the sustain electrodes applying a ramp waveform voltage that gently decreases to SU ₁ voltage Vi ₄ that exceeds the discharge start voltage from voltage Vi ₃ to the discharge start voltage or less with respect to SU _n. In the main discharge cell C _{i, j} and the priming discharge cell PS _i , the second time is applied between the scan electrodes SC _{1 to} SC _n and the sustain electrodes SU _{1 to} SU _n and the data electrodes D _{1 to} D _m . Weak initialization discharge occurs. The main discharge cell _{C i,} the negative wall voltage and the sustain electrodes _SU 1 to SU _n positive wall voltage on scan electrodes _SC 1 to SC _n top of the _j is weakened, the data electrodes _D 1 to D _m upper The positive wall voltage is adjusted to a value suitable for the write operation. The positive wall voltage above the data electrodes D _{1 to} D _m in the priming discharge cell PS _i is adjusted to a value suitable for the priming operation in the address period.

The odd line address period, to hold the odd-number scan electrodes SC _p temporarily voltage Vc. A voltage Vq is applied to the even-numbered scan electrode SC _{p + 1} to cause a discharge in the priming discharge cell PS _p between the adjacent odd-numbered scan electrode SC _p . Next, when scan pulse voltage Va is applied to first scan electrode SC _1, priming discharge occurs between the second scan electrode SC ₂ in priming discharge cell PS _1, the main discharge cell _{C 1, 1} Priming is supplied inside ~ C1 _{, m} . At this time, when a positive address pulse Vd is applied to the data electrode D _k (k is an integer of 1 to m) corresponding to the image signal to be displayed, discharge occurs at the intersection of the data electrode D _k and the scan electrode SC _1. generated, develop into a discharge between the corresponding sustain electrode SU ₁ of the main discharge cell _{C 1, k} and scan electrode SC _1. The main discharge cells C _1, positive wall voltage on scan electrodes SC ₁ top of the _k are accumulated negative wall voltage on sustain electrodes SU ₁ upper is accumulated, the first line of the write operation is terminated. At this time, the priming discharge cell PS ₁ inside the scan electrodes SC ₁ upper accumulate positive wall voltage, to the scan electrodes SC ₂ upper negative wall voltage is accumulated.

Similarly, an address operation is performed for odd-numbered main discharge cells C _{3, k} , C _{5, k} ,.

In the even line write period, the even scan electrode SC _{p + 1} is once held at the voltage Vc. The odd-numbered scan electrode SC _p is applied with a voltage Vq for generating a discharge in the priming discharge cell PS _p between the adjacent even-numbered scan electrode SC _{p + 1} . When scan pulse voltage Va is applied to second scan electrode SC _2, priming discharge occurs between the first and the scan electrodes SC ₁ in priming discharge cell PS _1. Discharge at this time, priming discharge cell PS ₁ inside the scan electrodes SC ₁ accumulated positive wall voltage on the top, discharge delay because the negative wall voltage stored in the scan electrodes SC ₂ top is subject to less stable Discharge. Then, priming is supplied into the main discharge cells _C2,1 to C2 _{, m} . At this time, by applying a positive write pulse Vd to the data electrode D _k corresponding to the image signal to be displayed, discharge occurs at the intersection of the data electrode D _k and scan electrode SC _2, the corresponding main discharge cells C _2, it develops the discharge between the sustain electrode SU ₂ of _k and scan electrode SC _2. The main discharge cells C _2, positive wall voltage on scan electrode SC ₂ the upper part of the _k are accumulated negative wall voltage on sustain electrode SU ₂ top is stored, the second line of the write operation is terminated. Incidentally, the priming discharge cell PS ₁ internal wall voltage is reversed, the priming discharge cell PS ₁ inside the scan electrodes SC ₁ and negative wall voltage on the top, to the scan electrodes SC ₂ positive wall voltage is accumulated.

In the same manner, the address operation is performed for the even-numbered main discharge cells C _{4, k} , C _{6, k} ,.

In the sustain period, after returning once to the scan electrodes _SC 1 to SC _n and sustain electrodes _SU 1 to SU _n to 0 (V), applies the positive sustain pulse voltage Vs to scan electrodes _SC 1 to SC _n. At this time, the voltage between the upper portion of scan electrode SC _{i and} upper portion of sustain electrode SU _i in main discharge cell C _{i, k} that has undergone the address discharge is applied to scan electrode SC during the address period in addition to positive sustain pulse voltage Vs. _The wall voltage accumulated in the upper part of _i and the upper part of sustain electrode SU _i is added and becomes larger than the discharge start voltage. As a result, a sustain discharge is generated in the main discharge cells C _{i, k} . Hereinafter, similarly, by applying a sustain pulse alternately to the scan electrodes _SC 1 to SC _n and sustain electrodes _SU 1 to SU _n, the number of sustain pulses main discharge cells _{C i} that caused the address _discharge, for _k Only the sustain discharge is continued.

In subsequent initializing period of sub-fields, maintaining the sustain electrodes _SU 1 to SU _n to a positive voltage Ve, the scan electrodes _SC 1 to SC _n applies a gradient waveform voltage gradually decreasing toward voltage Vi _4. Then, the main discharge cell _{C i} undergone a sustain _discharge, the scan electrodes _SC 1 to SC _n and sustain electrodes _SU 1 to SU _n of _k, and feeble initializing discharge occurs between the data electrodes _D 1 to D _m occurs . Then, scan electrodes _SC 1 to SC _n and sustain electrodes _SU 1 to SU _n top of the wall voltage is weakened, positive wall voltage on data electrodes _D 1 to D _m is adjusted to a value appropriate for the address operation .

  The subsequent write period, sustain period, and subsequent subfield drive waveforms and panel operation are the same as described above.

  Here, the operation in the first half of the initialization period will be described again in detail. FIG. 5 is an explanatory diagram of discharge in the first half of the initialization period. The discharge at this time is (1) discharge with the scan electrode 22 in the main discharge cell 40 as an anode and the sustain electrode 23 as a cathode, and (2) the scan electrode 22 in the main discharge cell 40 as an anode and the data electrode 32 as a cathode. It is necessary to consider three discharges: (3) discharge with the scanning electrode 22 in the priming discharge cell 41a as the anode and the data electrode 32 as the cathode. In addition, in FIG. 5, each discharge of (1)-(3) is shown using the arrow which goes to the anode side from a cathode side. Since the purpose of the initialization discharge is to adjust the wall voltage in the main discharge cell 40, it is sufficient that the discharges (1) and (2) can be stably generated. However, in the discharge (2), since the phosphor layer 35 having a small secondary electron emission coefficient serves as a cathode, the discharge hardly occurs and tends to be an unstable discharge. In the discharge (1), the protective layer 25 having a large secondary electron emission coefficient serves as a cathode. However, since the discharge is less likely to occur as compared with the counter discharge, for example, a panel having a high xenon partial pressure is used. In some cases, the discharge may become unstable. However, in the discharge (3), since the electron emission layer 39 having a large secondary electron emission coefficient is a cathode and is a counter discharge, a very stable discharge can be generated.

  Therefore, in the first embodiment of the present invention, by applying the voltage Vx to the data electrode, the discharge of (3) is generated before the discharge of (1) is generated, and is generated by the discharge of (3). The discharge of (1) is stably generated using priming. That is, before generating a discharge using the scan electrode 22 in the main discharge cell 40 as an anode and the sustain electrode 23 as a cathode, a discharge using the scan electrode 22 in the priming discharge cell 41a as an anode and the data electrode 32 as a cathode is generated. The voltage Vx is applied to the data electrode 32. Since the electron emission layer 39 provided in the priming discharge cell 41a reduces the discharge start voltage between the scan electrode and the data electrode, there is no possibility that the discharge of (2) occurs before the discharge of (3).

  As described above, according to the panel driving method of the first embodiment of the present invention, the initialization operation can be stably generated. For example, even in a panel in which the xenon partial pressure of the discharge gas is increased. The initialization discharge can be stabilized and an image can be displayed with good quality.

  In the first embodiment of the present invention, the scan electrode 22 in the priming discharge cell 41a is used as the anode and the data electrode before the discharge is generated using the scan electrode 22 in the main discharge cell 40 as the anode and the sustain electrode 23 as the cathode. A negative voltage Vx is applied to the data electrode 32 as a voltage for generating a discharge using the cathode 32, but the same effect can be obtained by applying a positive voltage Vy to the sustain electrode 23 as shown in FIG. Obtainable. In this case, by applying the positive voltage Vy to the sustain electrode 23, the voltage difference between the scan electrode 22 and the sustain electrode 23 in the main discharge cell 40 is reduced, and the start of the discharge in (1) is delayed. Since the discharge of (3) precedes, the discharge of (1) can be stably generated using the priming generated by the discharge of (3).

(Embodiment 2)
The panel structure in the second embodiment of the present invention is the same as that in the first embodiment. Also in the driving method, the odd-numbered line writing period and the even-numbered line writing period are used as the writing period, and these are performed separately in time as in the first embodiment. The difference between the second embodiment and the first embodiment is that the initialization period also has a subfield in which the odd line initialization period and the even line initialization period are separated in time. That is, in at least one subfield of the plurality of subfields, an odd line initialization period for performing initialization operation of a main discharge cell having an odd-numbered scan electrode and an initial stage of a main discharge cell having an even-numbered scan electrode The odd line initialization period is provided immediately before the odd line write period, and the even line initialization period is provided immediately before the even line write period. In the first half of each initialization period, the discharge with the scan electrode in the priming discharge cell as the anode and the data electrode as the cathode before the discharge with the scan electrode in the main discharge cell as the anode and the sustain electrode as the cathode is generated. Is applied to the data electrode.

  Next, driving waveforms and timing for driving the panel will be described together with the operation of the panel. FIG. 7 is a drive waveform diagram of the panel in accordance with the second exemplary embodiment of the present invention.

First, in the first half of the odd-numbered line initialization time period, a negative voltage Vx (V) is applied to data electrodes _D 1 to D _m, sustain electrodes _SU 1 to SU _n are kept 0 (V), the odd scan electrodes the SC _p applying a ramp waveform voltage gradually rises towards the voltage Vi ₁ to the voltage Vi _2. During this period, the first weak discharge occurs in the odd-numbered main discharge cells C _{p, j} and the priming discharge cell PS _p , and a negative wall voltage is accumulated on the odd-numbered scan electrode SC _p and the data electrode D ₁ positive wall voltage is accumulated on to D _m upper and odd sustain electrodes SU _p top. Similarly to the first embodiment in the second embodiment, the priming discharge in the priming discharge cell PS _p is initially started supplying priming in the main discharge cell. Thereafter, an initializing discharge in the main discharge cell occurs. As described above, the initializing discharge in the main discharge cell is generated in a state where the priming is supplied, so that the initializing discharge becomes very stable. Then, in the second half of the odd-numbered line initialization time period, maintaining the sustain electrodes _SU 1 to SU _n to a positive voltage Ve, the odd scan electrodes SC _p, ramp waveform that gradually drops toward the voltage Vi ₃ to the voltage Vi ₄ Apply voltage. During this period, the second weak discharge occurs in the odd-numbered main discharge cells C _{p, j} and the priming discharge cells PS _p , and the negative wall voltage above the odd scan electrodes SC _{p and} the positive voltage above the odd sustain electrodes SU _p are positive. the wall voltage is weakened, positive wall voltage on data electrodes D ₁ to D _m is adjusted to a value suitable for the write operation. The above is the discharge generated in the odd-numbered main discharge cells and the movement of the wall voltage. Note that no discharge occurs in the main discharge cells C _{p + 1, j} on the even line side.

At this time, inside the priming discharge cell PS _p movements discharge and wall voltage the following occurs. First, the odd in the first half of the line setup period for applying a ramp waveform voltage gradually rises to the odd scan electrodes SC _p while applying a negative voltage Vx (V) to the data electrodes D ₁ to D _m, is first initially starts a weak discharge between the odd-numbered scan electrode SC _p and the data electrodes D ₁ to D _m, a weak discharge occurs between subsequent odd scan electrodes SC _p and even-numbered scan electrode SC p _{+ 1.} Then, the priming discharge cell PS _p inside the odd scan electrodes SC _p and negative wall voltage on the top is accumulated, the even scan electrodes SC p _{+ 1} positive wall voltage is accumulated. In the second half of the odd-numbered line initialization time period, the odd scan electrodes SC _p, applying a ramp waveform voltage that gently decreases from voltage Vi ₃ to the voltage Vi _4. However, since the voltage Vr for suppressing the discharge is applied to the even-numbered scan electrode SC _{p + 1} , no discharge is generated or even if it occurs, the wall charge is not greatly reduced.

Thus, prior to the odd-numbered line address period, negative wall voltage is accumulated in the priming discharge cell PS _p inside the odd scan on electrodes SC _p, and positive wall voltage is accumulated on even-numbered scan electrode SC p _{+ 1} The

In the subsequent odd line write period, a scan voltage pulse Va having a negative voltage is further applied to the odd scan electrode SC _{p in} which the negative wall voltage has already been accumulated, and the even scan electrode SC _{p + 1} in which the positive wall voltage has already been accumulated. Further, a positive voltage Vq is applied to generate a priming discharge. Therefore, the priming discharge in the address period in the first subfield is also a stable discharge with a small discharge delay. Then, positive wall voltage, the negative wall voltage on the even scan electrodes SC p _{+ 1} is accumulated on odd-numbered scan electrode SC _p in priming discharge cell PS _p.

Next, in the first half of the even-numbered line initialization time period, a negative voltage Vx (V) is applied to data electrodes _D 1 to D _m, sustain electrodes _SU 1 to SU _n are kept 0 (V), the even-number scan A ramp waveform voltage that gently rises from the voltage Vi ₁ to the voltage Vi ₂ is applied to the electrode SC _{p + 1} . Also at this time, the initialization discharge in the main discharge cell C _{p + 1, j} is generated in a state where priming is supplied, so that the initialization discharge is very stable. Then, in the second half of the even-numbered line initialization time period, maintaining the sustain electrodes _SU 1 to SU _n to a positive voltage Ve, the even scan electrodes SC _p, ramp waveform that gradually drops toward the voltage Vi ₃ to the voltage Vi ₄ Apply voltage. During this time, the initialization operation similar to that of the odd-numbered main discharge cells C _{p, j} is performed in the even-numbered main discharge cells C _{p + 1, j} . Note that no discharge occurs in the even-numbered main discharge cells C _{p + 1, j} .

At this time, since the positive wall voltage on odd scan electrodes SC _p in priming discharge cell PS _p, the negative wall voltage on the even scan electrodes SC p _{+ 1} is stored, the first half of the even-numbered line initialization time period Even when a rising ramp waveform voltage is applied to the even-numbered scan electrode SC _{p + 1} in FIG. 5, the wall voltage works in a direction to cancel this voltage, so that no discharge occurs or even if it occurs, the wall charge is not greatly reduced. Furthermore, even if a ramp waveform voltage that falls to the even-numbered scan electrode SC _{p + 1} is applied in the latter half of the even-numbered line initialization period, a discharge is generated because the voltage Vr for suppressing the discharge is applied to the odd-numbered scan electrode SC _p. Even if it is generated, the wall charge is not greatly reduced.

In the subsequent even line writing period, a negative scan voltage pulse Va is further applied to the even scan electrode SC _{p + 1 in} which the negative wall voltage is accumulated, and further applied to the odd scan electrode SC _{p in} which the positive wall voltage is accumulated. A priming discharge is generated by applying a positive voltage Vq. Thus, the priming discharge at this time is a stable discharge with a small discharge delay because the wall voltage is added to the voltage applied to the electrode. Then, a positive wall voltage is accumulated on the even-numbered scan electrode SC _{p + 1} in the priming discharge cell PS _p , and a negative wall voltage is accumulated on the odd-numbered scan electrode SC _p .

  As described above, since the initialization operation can be stably generated even by the panel driving method according to the second embodiment of the present invention, for example, even a panel in which the xenon partial pressure of the discharge gas is increased, It is possible to stabilize the initializing discharge and display an image with good quality.

  Also in the second embodiment of the present invention, as shown in FIG. 6, the scanning electrode 22 in the main discharge cell 40 is used as an anode and the sustaining electrode 23 is used as a cathode before the discharge is generated in the priming discharge cell 41a. A positive voltage Vy may be applied to the sustain electrode 23 as a voltage for generating a discharge with the electrode 22 as an anode and the data electrode 32 as a cathode. Also in this case, by applying the positive voltage Vy to the sustain electrode 23, the voltage difference between the scan electrode 22 and the sustain electrode 23 in the main discharge cell 40 is reduced, and the start of the discharge of (1) is delayed. Since the discharge of (3) precedes, the discharge of (1) can be stably generated using the priming generated by the discharge of (3).

  Further, in the first and second embodiments of the present invention, during the initializing period of the first subfield, an all-cell initializing operation is performed in which initializing discharge is performed in all main discharge cells, and the initial of the next subfield is performed. Although the description has been given of the case where the selective initializing operation for selectively initializing the main discharge cells that have undergone the sustain discharge is performed during the initializing period, these initializing operations may be arbitrarily combined.

  Further, since each electrode of the AC type PDP is surrounded by a dielectric layer and insulated from the discharge space, the direct current component does not contribute to the discharge itself. Therefore, even if an arbitrary DC voltage is superimposed and applied to the drive voltage waveforms shown in FIGS. 4, 6 and 7, the same effects as those of the first and second embodiments of the present invention can be obtained.

  The panel driving method of the present invention is useful for a plasma display device used for a wall-mounted television, a large monitor, and the like because it can stabilize the initializing discharge and display an image with good quality.

The disassembled perspective view which shows the structure of the panel in Embodiment 1 of this invention. Cross section of the panel Electrode arrangement of the panel Drive waveform diagram of the panel Explanatory drawing of discharge in the first half of the initialization period Other drive waveform diagram of the panel Drive waveform diagram of panel in embodiment 2 of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 21 Front substrate 22 Scan electrode 22a, 23a Transparent electrode 22b, 23b Metal bus line 22b 'Protruding part 23 Sustain electrode 24 Dielectric layer 25 Protective layer 28 Light absorption layer 31 Back substrate 32 Data electrode 33 Dielectric layer 34 Partition 34a Vertical wall part 34b Horizontal wall portion 35 Phosphor layer 39 Electron emission layer 40 Main discharge cell 41a Priming discharge cell

Claims (2)

A first substrate;
A plurality of display electrode pairs on the first substrate, each including a scan electrode and a sustain electrode arranged in parallel;
A second substrate disposed opposite to the first substrate across a discharge space;
A plurality of data electrodes disposed on the second substrate in a direction intersecting with the display electrode pair;
Forming a main discharge cell between the first substrate and the second substrate and generating a main discharge along a display electrode pair including a pair of scan electrodes and sustain electrodes on the second substrate; A driving method of a plasma display panel comprising a partition wall provided so as to form a priming discharge cell for generating a priming discharge in a gap portion where two scanning electrodes are adjacent to each other,
One field is composed of a plurality of subfields having an initialization period, an address period, and a sustain period,
In the initializing period of at least one subfield of the plurality of subfields, the slope of the scan electrode gradually rises from a voltage lower than a discharge start voltage to a voltage exceeding the discharge start voltage with respect to the sustain electrode Applying a negative voltage to the data electrode while holding the sustain electrode at 0 volts while applying a waveform voltage,
A plasma display comprising: generating a discharge using the scan electrode in the priming discharge cell as an anode and the data electrode as a cathode before generating a discharge using the scan electrode in the main discharge cell as an anode and a sustain electrode as a cathode. Panel drive method. A first substrate;
A plurality of display electrode pairs on the first substrate, each including a scan electrode and a sustain electrode arranged in parallel;
A second substrate disposed opposite to the first substrate across a discharge space;
A plurality of data electrodes disposed on the second substrate in a direction intersecting with the display electrode pair;
Forming a main discharge cell between the first substrate and the second substrate and generating a main discharge along a display electrode pair including a pair of scan electrodes and sustain electrodes on the second substrate; A driving method of a plasma display panel comprising a partition wall provided so as to form a priming discharge cell for generating a priming discharge in a gap portion where two scanning electrodes are adjacent to each other,
One field is composed of a plurality of subfields having an initialization period, an address period, and a sustain period,
In the initializing period of at least one subfield of the plurality of subfields, the slope of the scan electrode gradually rises from a voltage lower than a discharge start voltage to a voltage exceeding the discharge start voltage with respect to the sustain electrode Applying a positive voltage to the sustain electrode while holding the data electrode at 0 volts while applying a waveform voltage,
A plasma display comprising: generating a discharge using the scan electrode in the priming discharge cell as an anode and the data electrode as a cathode before generating a discharge using the scan electrode in the main discharge cell as an anode and a sustain electrode as a cathode. Panel drive method.

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