JP3573005B2 - Driving method of plasma display panel and display device using the same - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a plasma display panel driving method and a display device using the same, and more particularly, to a plasma display panel having at least three types of electrodes, a first electrode 1, a second electrode 2, and a third electrode 3. Self-erasing discharge, that is, when the potential difference between the electrodes is reduced, a discharge generated by the attraction of its own wall charge is generated, and when the potential difference between the electrodes is increased, the self-erasing discharge is used as a trigger, The present invention relates to a method for driving a plasma display panel, which generates a discharge and emits light.
[0002]
[Prior art]
Plasma display panels (PDPs) are capable of high-speed display compared to liquid crystal panels, have a wide viewing angle, are easy to increase in size, and have high display quality due to their self-luminous type. Recently, attention has been paid particularly to flat panel display technology.
[0003]
In general, in a PDP, ultraviolet light is generated by gas discharge, and a phosphor is excited by the ultraviolet light to emit light, thereby performing color display. Then, a display cell partitioned by a partition is provided on the substrate, and a phosphor layer is formed on the display cell.
[0004]
In particular, the current mainstream of PDPs is a surface discharge type PDP having a three-electrode structure, and an exploded perspective view of the structure is shown in FIG. It has a pair of display electrodes adjacent to each other in parallel on one substrate, and has an address electrode 23 extending in a direction intersecting with the display electrodes on the other substrate, a partition wall 16 and a phosphor layer 17, and is relatively fluorescent. It can be said that the body layer can be thickened, which is suitable for color display using a phosphor.
[0005]
The display electrode pair includes a scan electrode (scan electrode) 21 and a sustain electrode (sustain electrode) 22.
[0006]
In a conventional panel driving method, one field period is divided into a plurality of subfields having a weight of a light emitting period based on a binary system, and gradation display is performed by a combination of subfields to emit light. Each subfield includes an initialization period, an address period, and a sustain period. In order to display image data, different signal waveforms are applied to each electrode during the initialization period, the address period, and the sustain period. In the initialization period, an initialization pulse is applied to all scan electrodes 21. In the address period, by applying a write pulse between the address electrode 23 and the scan electrode 21, an address discharge is performed between the address electrode 23 and the scan electrode 21 to select a discharge cell. In the subsequent sustain period, a sustain discharge that alternates between the scan electrodes 21 and the sustain electrodes 22 is applied between the scan electrodes 21 and the sustain electrodes 22 for a certain period, so that a sustain discharge is generated between the scan electrodes 21 and the sustain electrodes 22. And display.
[0007]
However, the conventional plasma display device still has a problem that the luminous efficiency is low and the luminance is low. For example, the luminous efficiency is 1 lm / W, which is about 1/5 of the CRT.
[0008]
Until now, various studies have been made on the above-mentioned problem, but there is no example in which a PDP using a positive column for increasing the luminous efficiency of ultraviolet rays has been put to practical use. This is because the size of the PDP cell is limited with respect to the distance between the electrodes required for the positive column, and it is difficult to control the discharge by simply increasing the distance between the electrodes. It is thought that it is possible.
[0009]
Patents include, for example, JP-A-5-41165, JP-A-5-41164, and JP-A-6-275202, but sufficient results have not been obtained even by employing the patent information. .
[0010]
[Problems to be solved by the invention]
As described above, the conventional plasma display device has a problem that the luminous efficiency is significantly lower than that of a display device such as a CRT. In general, a positive column can be generated by increasing the distance between the electrodes that cause a discharge. However, in a PDP cell configuration, simply increasing the distance between the electrodes does not stabilize the positive column, the discharge flickers, and the driving voltage decreases. It is high and the luminous efficiency is not so large.
[0011]
An object of the present invention is to solve the above-mentioned problems, that is, a method of driving a plasma display panel that can use a positive column stably and realize low-voltage driving, high luminance, and high luminous efficiency, and a display device using the same. Is to provide.
[0012]
[Means for Solving the Problems]
The method of driving a plasma display panel according to the present invention reduces self-erasing discharge, that is, a potential difference between electrodes, for a plasma display panel having at least three types of electrodes, a first electrode, a second electrode, and a third electrode. A plasma display, which generates a discharge generated by the attraction of its own wall charge, and when the potential difference between the electrodes is increased, the self-erasing discharge is used as a trigger to generate a discharge and emit light. This is a method of driving the panel.
[0019]
Claims of the invention 1 The invention described in the above, the plasma display panel having at least three types of electrodes, the first electrode, the second electrode and the third electrode, during the maintenance period, between the first electrode and the second electrode, and the first electrode When the potential difference between the third electrodes or / and between the third electrode and the second electrode is reduced, a self-erasing discharge occurs between the third electrode and the second electrode or / and between the first electrode and the third electrode. When the potential difference between the first electrode and the second electrode, and between the first electrode and the third electrode, or / and the third electrode and the second electrode is increased, the self-erasing discharge as a trigger, The first discharge current Imain flows between the first electrode and the second electrode to emit light, and the second discharge current Isub flows between the third electrode and the second electrode or / and between the first electrode and the third electrode. A method for driving a plasma display panel, characterized in that:
[0020]
With such a driving method, a self-erasing discharge between the third electrode and the second electrode or / and between the first electrode and the third electrode can be used as a trigger discharge, so that the positive column discharge in the next cycle can be performed at a low voltage. Can be generated. In addition, by using the third electrode for trigger discharge, wall charges between the first electrode and the second electrode can be effectively used without decreasing. Further, by flowing a discharge current Isub between the third electrode and the second electrode or / and between the first electrode and the third electrode, it becomes possible to form wall charges for a trigger discharge in the next cycle, Discharge can be maintained.
[0021]
Claims of the invention 2 The invention described in the above, the plasma display panel having at least three kinds of electrodes, the first electrode, the second electrode and the third electrode, during the sustain period, between the third electrode and the second electrode, or / and the first When a trigger discharge is generated between the electrode and the third electrode, and the trigger discharge is used as a trigger to increase a potential difference between the first electrode and the second electrode, a first discharge is generated between the first electrode and the second electrode. A driving method of a plasma display panel, characterized by flowing a current Imain to emit light and flowing a second discharge current Isub between a third electrode and a second electrode or / and between a first electrode and a third electrode. .
[0022]
According to such a driving method, the trigger discharge is generated between the third electrode and the second electrode or / and between the first electrode and the third electrode. Therefore, the positive column discharge in the next cycle can be generated at a low voltage. It becomes possible. In addition, by using the third electrode for trigger discharge, wall charges between the first electrode and the second electrode can be effectively used without decreasing. Further, by flowing a discharge current Isub between the third electrode and the second electrode or / and between the first electrode and the third electrode, it becomes possible to form wall charges for a trigger discharge in the next cycle, Discharge can be maintained.
[0023]
Claims of the invention 3 The invention described in (1) is characterized in that the discharge is continued by using a self-erasing discharge or a trigger discharge as a trigger in the next cycle. Or 2 It is a driving method of the plasma display panel described.
[0024]
With such a driving method, the duration of the discharge can be controlled depending on whether the self-erasing discharge or the trigger discharge is used as a trigger in the next cycle.
[0025]
Claims of the invention 4 According to the invention described in the above, when the first discharge current Imain flows between the first electrode and the second electrode to emit light, the fluctuation of the discharge current is suppressed on the first electrode side and / or the second electrode side. A back electromotive force Vemf-main is generated. 3 13. A driving method for a plasma display panel according to any one of the above items.
[0026]
According to such a driving method, the fluctuation of the discharge current Imain can be further suppressed by the back electromotive force Vemf-main, and the positive column discharge can be stably formed, and the flicker of the discharge can be suppressed. In addition, the positive column discharge thus formed has a very high efficiency and can obtain a strong luminous intensity.
[0027]
Claims of the invention 5 When the potential difference between the first electrode and the second electrode, and between the first electrode and the third electrode, and / or between the third electrode and the second electrode is increased, the invention described in A back electromotive force Vemf-C that suppresses fluctuations of the voltage is generated. 4 13. A driving method for a plasma display panel according to any one of the above items.
[0028]
With such a driving method, it is possible to suppress a decrease in the charge / discharge current of the panel with the back electromotive force Vemf-C immediately before the discharge, and to substantially increase the voltage applied to the discharge space. Emission intensity can be obtained.
[0029]
Claims of the invention 6 In the invention described in the above, when the second discharge current Isub flows between the third electrode and the second electrode or / and between the first electrode and the third electrode, the second discharge current Isub A back electromotive force Vemf-sub for suppressing fluctuations of the voltage is generated. 5 13. A driving method for a plasma display panel according to any one of the above items.
[0030]
According to such a driving method, the discharge current Isub flowing to the third electrode by the back electromotive force Vemf-sub can be suppressed to a minimum. Thus, for example, in a panel in which a phosphor layer or the like is formed on the third electrode, deterioration of the phosphor layer can be suppressed.
[0031]
Claims of the invention 7 The peak value of the first discharge current Imain flowing between the first electrode and the second electrode is reduced by 10% or more by the back electromotive force Vemf-main. 4 Not 6 13. A driving method for a plasma display panel according to any one of the above items.
With such a driving method, the fluctuation of the discharge current Imain can be further suppressed by the back electromotive force Vemf-main, the positive column discharge can be formed stably, and the flicker of the discharge can be suppressed. In addition, the positive column discharge thus formed has a very high efficiency and can obtain a strong luminous intensity.
[0032]
Claims of the invention 8 In the invention, the second discharge current Isub between the third electrode and the second electrode or / and between the first electrode and the third electrode is the sum of the first discharge current Imain and the second discharge current Isub. Claims characterized by flowing over 10% 1 Not 7 13. A driving method for a plasma display panel according to any one of the above items.
[0033]
According to such a driving method, it is possible to stably form wall charges for trigger discharge in the next cycle, and to stably sustain discharge.
[0034]
Claims of the invention 9 The invention described in Claim 1 8 A plasma display device characterized by using any one of the above-described methods for driving a plasma display panel.
[0035]
With such a display device, since the self-erasing discharge can be used as a trigger discharge, the positive column discharge in the next cycle can be generated at a low voltage. In addition, by using the third electrode for trigger discharge, wall charges between the first electrode and the second electrode can be effectively used without decreasing. Furthermore, by flowing a discharge current Isub between the third electrode and the second electrode or / and between the first electrode and the third electrode, it becomes possible to form wall charges for a trigger discharge in the next cycle, Discharge can be maintained. Further, the duration of the discharge can be controlled by determining whether the self-erasing discharge or the trigger discharge is used as a trigger in the next cycle. Furthermore, the fluctuation of the discharge current Imain is suppressed by the back electromotive force Vemf-main, so that the positive column discharge can be formed stably and the flicker of the discharge can be suppressed.
[0036]
In addition, the positive column discharge thus formed has a very high efficiency and can obtain a strong luminous intensity. Further, immediately before the discharge, the back electromotive force Vemf-C can suppress a decrease in the charge / discharge current of the panel, and can substantially increase the voltage applied to the discharge space, so that a strong luminous intensity can be obtained. . Further, the discharge current Isub flowing to the third electrode can be suppressed to a necessary minimum by the back electromotive force Vemf-sub. Thus, for example, in a panel in which a phosphor layer or the like is formed on the third electrode, deterioration of the phosphor layer can be suppressed.
[0037]
Claim 1 of the present invention 0 The discharge start voltage between the third electrode and the second electrode or / and the discharge start voltage between the third electrode and the second electrode is smaller than the discharge start voltage between the first electrode and the second electrode. Claims 9 3. The plasma display device according to item 1.
[0038]
With such a display device, self-erasing discharge or trigger discharge can be easily generated between the third electrode and the second electrode or / and between the third electrode and the second electrode.
[0039]
Claim 1 of the present invention 1 The invention according to claim, wherein a distance between the third electrode and the second electrode, or / and a distance between the third electrode and the second electrode, is smaller than a distance between the first electrode and the second electrode. 9 or 10 It is a plasma display device of the description.
[0040]
With such a display device, self-erasing discharge or trigger discharge can be easily generated between the third electrode and the second electrode or / and between the third electrode and the second electrode.
[0041]
Claim 1 of the present invention 2 The invention according to claim, wherein an inductance is inserted in series on the first electrode side and / or the second electrode side. 9 Or 1 1 The plasma display device according to any one of the above.
[0042]
With such a display device, the fluctuation of the discharge current Imain is suppressed by the inductance, the positive column discharge can be stably formed, and the flicker of the discharge can be suppressed. In addition, the positive column discharge thus formed has a very high efficiency and can obtain a strong luminous intensity.
[0043]
Claim 1 of the present invention 3 The invention according to claim 1, wherein the peak value of the first discharge current Imain flowing between the first electrode and the second electrode is reduced by 10% or more due to the inductance. 2 It is a plasma display device of the description.
[0044]
According to such a display device, the fluctuation of the discharge current Imain can be further suppressed by the back electromotive force Vemf-main, and the positive column discharge can be stably formed, and the flicker of the discharge can be suppressed. In addition, the positive column discharge thus formed has a very high efficiency and can obtain a strong luminous intensity.
[0045]
Claim 1 of the present invention 4 The invention according to claim, wherein the distance between the first electrode and the second electrode is 0.2 mm or more. 9 Or 1 3 The plasma display device according to any one of the above.
[0046]
With such a display device, it is further possible to clearly generate a positive column.
[0047]
Claim 1 of the present invention 5 The invention according to claim 1, wherein the first electrode and the second electrode are formed on a first substrate, and the distance between the first substrate and the opposing second substrate is 0.15 mm or more. 9 Or 1 4 The plasma display device according to any one of the above.
[0048]
With such a display device, it is possible to further secure a sufficient discharge space, and to generate a positive column strongly and stably.
[0049]
Claim 1 of the present invention 6 The invention according to claim 1, wherein a plurality of the third electrodes are formed in one display cell (minimum display unit). 9 Or 1 5 The plasma display device according to any one of the above.
[0050]
With such a display device, the positive column is further spread on a plurality of third electrodes (a plurality of positive columns are formed in some cases), and the luminous intensity and the luminous efficiency can be increased.
[0051]
Claim 1 of the present invention 7 The invention described in (1), wherein a protrusion is formed between a plurality of the third electrodes formed in one display cell (minimum display unit). 6 It is a plasma display device of the description.
[0052]
According to such a display device, a plurality of positive columns are further formed on the plurality of third electrodes, so that the luminous intensity and the luminous efficiency can be further improved.
[0053]
Claim 1 of the present invention 8 In the invention described in (1), a first electrode and a second electrode are formed on a first substrate, and a third electrode is formed on the first substrate so as to intersect the first electrode and the second electrode via a dielectric. Claims characterized by the following 9 Or 1 7 The plasma display device according to any one of the above.
[0054]
With such a display device, the first electrode 1 and the second electrode 2 are further formed on the first substrate 11, and the third electrode 3 intersects the first electrode 1 and the second electrode 2 via a dielectric. By forming the first substrate 11 on the first substrate 11, a material having a high secondary electron emission coefficient can be used as a protective film on all three types of electrodes. This makes it possible to lower the discharge starting voltage, and there is no restriction on using the third electrode as a cathode.
[0055]
Claims of the invention 19 According to the invention described in the second aspect, the first electrode and the second electrode are formed on the first substrate, and the third electrode intersects the first electrode and the second electrode so that the second substrate faces the first substrate. Claims characterized by being formed in 9 Or 1 8 The plasma display device according to any one of the above.
[0056]
With such a display device, the first electrode 1 and the second electrode 2 are further formed on the first substrate 11, and the first electrode 1 and the second electrode 2 are intersected with the first electrode 1 and the second electrode 2. Since the second substrate 12 is formed on the second substrate 12 facing the substrate 11, light emission due to the opposite discharge in addition to the surface discharge can be obtained, and higher emission intensity can be obtained.
[0057]
Claim 2 of the present invention 0 The first aspect of the invention is characterized in that a first electrode and a second electrode are formed on a first substrate, and a float electrode is formed between adjacent display cells (minimum display units) on the first substrate. Claim 9 Not 19 The plasma display device according to any one of the above.
[0058]
With such a display device, the first electrode 1 and the second electrode 2 are further formed on the first substrate 11, and the floating electrode is formed between adjacent display cells (minimum display units) on the first substrate 11. By doing so, crosstalk can be suppressed.
Hereinafter, the present invention will be specifically described with reference to embodiments, but embodiments of the present invention are not limited thereto.
[0059]
(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0060]
A driving method of a plasma display panel described in this embodiment and a display device using the same can be applied to a plasma display panel having at least three types of electrodes, a first electrode, a second electrode, and a third electrode. It is characterized by generating an erasing discharge, that is, a discharge generated by the attraction of its own wall charge when the potential difference between the electrodes is reduced.
[0061]
Further, when the potential difference between the electrodes is increased, the self-erasing discharge is triggered to generate a discharge and emit light.
[0062]
Further, for a plasma display panel having at least three types of electrodes, a first electrode, a second electrode, and a third electrode, between the first electrode and the second electrode, between the first electrode and the third electrode, and / or When the potential difference between the third electrode and the second electrode is reduced, a self-erasing discharge is generated between the third electrode and the second electrode or / and between the first electrode and the third electrode.
[0063]
Further, when the potential difference between the first electrode and the second electrode, and between the first electrode and the third electrode, and / or between the third electrode and the second electrode is increased, the self-erasing discharge is used as a trigger, A discharge current Imain is caused to flow between the first electrode and the second electrode to emit light, and a discharge current Isub is caused to flow between the third electrode and the second electrode or / and between the first electrode and the third electrode.
[0064]
Also, for a plasma display panel having at least three types of electrodes, a first electrode, a second electrode, and a third electrode, a trigger is generated between the third electrode and the second electrode or / and between the first electrode and the third electrode. When a discharge is generated, and this is used as a trigger to increase the potential difference between the first electrode and the second electrode, a discharge current Imain flows between the first electrode and the second electrode to emit light, and the third electrode A discharge current Isub is passed between the second electrodes or / and between the first and third electrodes.
[0065]
Further, the self-erasing discharge or the trigger discharge is used as a trigger in the next cycle, so that the discharge is continued.
[0066]
Further, when a discharge current Imain flows between the first electrode and the second electrode to emit light, a back electromotive force Vemf-main that suppresses fluctuation of the discharge current is applied to the first electrode and / or the second electrode. It is characterized by generating.
[0067]
In addition, when the potential difference between the first electrode and the second electrode, between the first electrode and the third electrode, and / or between the third electrode and the second electrode is increased, the fluctuation of the charge / discharge current of the panel is suppressed. And generating a back electromotive force Vemf-C.
[0068]
Further, a peak value of the discharge current Imain flowing between the first electrode and the second electrode is reduced by 10% or more by the back electromotive force Vemf-main.
[0069]
Further, the discharge current Isub between the third electrode and the second electrode or / and between the first electrode and the third electrode flows at least 10% of the sum of the discharge current Imain and the discharge current Isub. .
[0070]
Further, a discharge starting voltage between the third electrode and the second electrode or / and between the third electrode and the second electrode is smaller than a discharge starting voltage between the first electrode and the second electrode.
[0071]
Further, a distance between the third electrode and the second electrode or / and a distance between the third electrode and the second electrode is smaller than a distance between the first electrode and the second electrode.
[0072]
Hereinafter, the present embodiment will be described with reference to specific examples, but embodiments of the present invention are not limited thereto.
[0073]
[Panel structure]
FIG. 1 is an exploded perspective view of a plasma display panel (PDP) used in the first embodiment. The PDP shown in FIG. 1 has a first electrode 1 and a second electrode 2 substantially parallel to each other on the inner surface of one first substrate 11 of a pair of substrates sandwiching a discharge space, and further has a dielectric layer 13 and a protection layer thereon. It has a layer 14.
[0074]
On the inner surface of the other second substrate 12, a third electrode 3 intersecting the first electrode 1 and the second electrode 2, a dielectric layer (overcoat layer) 15 thereon, and a discharge space defined as a unit light emitting region EU A partition 16 is provided for each partition, and a phosphor 17 emits light by discharge. The distance between the first electrode 1 and the second electrode 2 is 0.2 mm or more.
The material of the substrate is generally soda lime glass, but is not particularly limited.
[0075]
As the material of the partition walls, a low melting point glass is generally used, but is not particularly limited. The phosphor is not particularly limited as long as it emits light when excited by ultraviolet rays generated by the discharge. As the material of the dielectric, low melting glass is generally used, but is not particularly limited. A material having a high secondary electron emission coefficient γ is desirable for the protective film, and MgO is generally used, but is not particularly limited. The discharge gas is generally a mixed gas of at least one of He, Ne, and Ar and Xe, but is not particularly limited.
[0076]
[Driving method]
FIG. 2 shows voltage waveforms output from the circuit with respect to the first electrode 1 (FIG. 2A), the second electrode 2 (FIG. 2B), and the third electrode 3 (FIG. 2C) during the sustain period. Is shown. 2, the vertical axis represents voltage, and the horizontal axis represents time. FIG. 2 shows only a period in which the voltage of the second electrode 2 changes from Hi to Lo and the voltage of the first electrode 1 changes from Lo to Hi. In the sustain period, the voltage of the second electrode 2 changes from Hi to Lo, the voltage of the first electrode 1 changes from Lo to Hi, the voltage of the first electrode 1 changes from Hi to Lo, and the voltage of the second electrode 2 changes. Are continuously emitted by repeating a period in which the state changes from Lo to Hi.
[0077]
First, during a period in which the voltage of the second electrode 2 changes from Hi to Lo, the potential differences between the first electrode 1 and the second electrode 2 and between the third electrode 3 and the second electrode 2 are reduced. The capacitor is discharging. At this time, the discharge starting voltage between the third electrode 3 and the second electrode 2 is sufficiently lower than the discharge starting voltage between the first electrode 1 and the second electrode 2, and in the previous cycle, the third electrode 3 and the third If a sufficient wall charge is formed between the two electrodes 2, the potential difference between the third electrode 3 and the second electrode 2 is reduced, so that a self-erasing discharge is generated between the third electrode 3 and the second electrode 2. Can be made.
[0078]
FIG. 3 shows a waveform of a current flowing through the first electrode 1 (FIG. 3A), the second electrode 2 (FIG. 3B), and the third electrode 3 (FIG. 3C). A current accompanying the self-erasing discharge is observed between the third electrode 3 and the second electrode 2.
[0079]
In the subsequent period in which the voltage of the first electrode 1 changes from Lo to Hi, a potential difference is generated between the first electrode 1 and the second electrode 2 and between the first electrode 1 and the third electrode 3, and The panel is charged with the electrode 1 being positive and the second electrode 2 and the third electrode 3 being negative. At this time, the voltage was applied so that the potential change speed was 1.0 V / ns or more. Further, an inductance of 100 μH was inserted on the first electrode 1 side of the circuit in order to generate the back electromotive force Vemf-C that suppresses the fluctuation of the charging current of the panel. Therefore, when actually observing the voltage and current waveforms of the first electrode 1, the second electrode 2, and the third electrode 3, the results are as shown in FIG. This makes it possible to increase the electric field intensity applied between the first electrode 1 and the second electrode 2 immediately before the start of discharge.
[0080]
Next, when the self-erasing discharge between the third electrode 3 and the second electrode 2 triggers the discharge, a discharge current Imain flows between the first electrode 1 and the second electrode 2 to emit light.
[0081]
At this time, the 100 μH inductance inserted on the first electrode 1 side of the circuit is used as it is in order to generate the back electromotive force Vemf-main for suppressing the fluctuation of the discharge current. As a result, the discharge current Imain becomes small and the current waveform becomes gentle. At this time, when observing the positive column, it can be seen that it is strongly thick and very stable. Furthermore, at the same time when the discharge starts, a discharge current Isub flows between the third electrode 3 and the second electrode 2 to which no voltage is applied. As described above, by flowing the discharge current Isub, it becomes possible to form wall charges for the trigger discharge of the next cycle between the second electrode 2 and the third electrode 3, and it is possible to sustain the discharge. Become.
[0082]
Hereinafter, the next cycle will be described. At this stage, the polarity of the wall charge between the second electrode 2 and the third electrode 3 is on the third electrode 3 side. negative , The second electrode 2 side Correct It is. Also , Continued In addition, during the period in which the voltage of the first electrode 1 changes from Hi to Lo, self-erasing discharge does not occur.
[0083]
In a subsequent period during which the voltage of the second electrode 2 changes from Lo to Hi, a potential difference is generated between the second electrode 2 and the first electrode 1 and between the second electrode 2 and the third electrode 3, The panel is charged with the two electrodes 2 positive and the first and third electrodes 1 and 3 negative. At this time, the voltage was applied so that the potential change speed was 1.0 V / ns or more.
[0084]
Next, a trigger discharge occurs between the second electrode 2 and the third electrode 3 due to the applied voltage and the wall charges between the second electrode 2 and the third electrode 3. At the same time, this is used as a pilot light, and a discharge current Imain flows between the second electrode 2 and the first electrode 1 to emit light. At this time, the 100 μH inductance inserted on the first electrode 1 side of the circuit is used as it is in order to generate the back electromotive force Vemf-main for suppressing the fluctuation of the discharge current. As a result, the discharge current Imain becomes small and has a gentle current waveform. Further, at the same time when the discharge starts, a discharge current Isub flows between the second electrode 2 and the third electrode 3. As described above, by flowing the discharge current Isub, it becomes possible to form wall charges for the self-erase discharge in the next cycle between the second electrode 2 and the third electrode 3 and to sustain the discharge. It becomes possible.
[0085]
In the sustain period, light emission is continuously performed by repeating the above.
[0086]
If the back electromotive force Vemf-C is not generated, an inductance may be inserted immediately before the discharge.
By driving in this manner, a positive column discharge can be formed stably and can be sustained, the distance between the first electrode 1 and the second electrode 2 is 0.5 mm, and the first column 11 faces the first substrate 11. With a panel in which the distance between the second substrates 12 was 0.12 mm, a sustain voltage of 245 V and a luminous efficiency of 2.54 lm / W could be obtained.
[0087]
Here, the distance between each of the first electrode 1, the second electrode 2, and the third electrode 3 is changed to adjust the discharge starting voltage between the electrodes, or to adjust the driving voltage, thereby obtaining the second electrode 2 During the period when the voltage of the third electrode changes from Hi to Lo, it is possible to prevent the self-erasing discharge from being generated between the third electrode 3 and the second electrode 2. When such driving is performed, the discharge becomes unstable or the discharge stops.
[0088]
Further, during a period in which the voltage of the second electrode 2 changes from Hi to Lo, a self-erasing discharge is generated between the third electrode 3 and the second electrode 2, and then the voltage of the first electrode 1 is changed to Lo. By making the time from change to Hi sufficiently long, even if a self-erasing discharge is generated, it can be prevented from being used as a trigger. When such a discharge is performed, the discharge stops.
[0089]
Next, FIG. 4 shows the voltage and current waveforms of the first electrode 1, the second electrode 2, and the third electrode 3 when the back electromotive force Vemf-main due to the inductance is not generated. 4A shows the voltage and current waveforms of the first electrode 1, FIG. 4B shows the voltage of the second electrode 2, and FIG. 4C shows the voltage and current waveforms of the third electrode 3. The discharge current Imain is reduced by 10% or more due to the back electromotive force Vemf-main of the inductance.
In this case, the positive column discharge is unstable and the flicker of the discharge is large, the distance between the first electrode 1 and the second electrode 2 is 0.5 mm, and the distance between the first substrate 11 and the opposing second substrate 12 is large. Was a 0.12 mm panel with a sustaining voltage of 300 V and a luminous efficiency of 1.28 lm / W.
Next, the phenomenon when the magnitude of the inductance is changed or the driving voltage is increased will be described.
[0090]
At this time, similarly, the back electromotive force Vemf-main is generated by using the inductance, so that Isub can be set to 0 or 10% or less of Imain + Isub. Further, the discharge current Imain can be reduced by less than 10% by the back electromotive force Vemf-main. With such driving, the positive column discharge is not stabilized, and the luminous efficiency does not increase so much. Further, when Isub is extremely reduced, it becomes impossible to form wall charges for the self-erasing discharge or the trigger discharge in the next cycle, and the discharge becomes unstable or stops. .
[0091]
Further, a pulse can be applied to the third electrode 3 in order to forcibly generate a trigger discharge.
[0092]
Next, a description will be given of a phenomenon in a case where the rate of change of the potential is changed in the process of generating a potential difference between the first electrode 1 and the second electrode 2. As a result of examining the potential changing speed from 0.5 V / ns to 2.5 V / ns, it was found that the luminous efficiency was greatly changed by the potential changing speed. In particular, the luminous efficiency becomes extremely large at 1.0 V / ns or more. For example, in the above-described panel, when the potential change rate is 0.5 V / ns, the luminous efficiency is about 1.2 lm / W. When the changing speed of the potential is 1.8 V / ns, the luminous efficiency is 2.54 lm / W.
[0093]
In addition, although the coil of 100 μH is used in our panel this time, the optimum size is determined by the capacity of the panel. That is, an inductance that generates the back electromotive force Vemf-main such that the discharge current Imain decreases by 10% or more and an inductance that causes the discharge current Isub to flow 10% or more of Imain + Isub may be selected according to the capacity of the panel. If the inductance size is optimized, the luminous efficiency is further increased by using the inductance on both the first electrode 1 side and the second electrode 2 side.
[0094]
Further, as a means for generating the back electromotive force Vemf-main and Vemf-C, an inductance is used in the above example, but there is no particular limitation as long as it can generate the back electromotive force. For example, as means for generating the back electromotive force Vemf-main, a back electromotive force or a reverse pulse that cancels out the potential difference between the first electrode 1 and the second electrode 2 can be applied. Further, it is possible to make the waveform of the discharge current Imain gentle by continuously superimposing pulses. Similarly, a pulse can be intentionally superimposed as a means for generating the back electromotive force Vemf-C. FIG. 5 shows the waveform of the applied voltage when the back electromotive force is generated by a pulse. 5A shows a voltage waveform of the first electrode 1, FIG. 5B shows a voltage waveform of the second electrode 2, and FIG. 5C shows a voltage waveform of the third electrode 3.
[0095]
In order to force the discharge current Isub to flow, it is possible to apply a pulse to the third electrode 3 simultaneously with the start of the discharge.
Further, in order to make it easier for the discharge current Isub to flow, a potential difference may be provided between the third electrode 3 and the second electrode when the panel is charged. FIG. 6 shows the waveform of the applied voltage when a pulse is applied to the third electrode 3 and the discharge current Isub is forced to flow. 6A shows the voltage waveform of the first electrode 1, FIG. 6B shows the voltage waveform of the second electrode 2, and FIG. 6C shows the voltage waveform of the third electrode 3.
[0096]
Also, the process of providing a potential difference between the electrodes does not necessarily need to be due to the charging of the panel, and may use, for example, the discharge of the panel (not the gas discharge).
[0097]
Strictly speaking, the effect of the invention of the present embodiment slightly changes due to a change in capacitance due to the lighting rate of the panel. However, by controlling the back electromotive force Vemf-main with respect to the display amount, the luminous efficiency can be optimized according to the display amount.
[0098]
[Display device]
For example, the first electrode 1, the second electrode 2, and the third electrode 3 carry scan electrodes, sustain electrodes, and address electrodes described below.
[0099]
FIG. 7 is a block diagram showing a configuration of the display device according to the present embodiment. 7 includes a PDP 100, an address driver 110, a scan driver 120, a sustain driver 130, a discharge control timing generation circuit 140, an A / D converter (analog-to-digital converter) 151, a scan number converter 152, and a subfield. A conversion unit 153 is included.
[0100]
The PDP 100 includes a plurality of address electrodes, a plurality of scan electrodes (scan electrodes), and a plurality of sustain electrodes (sustain electrodes). The plurality of address electrodes are arranged in the vertical direction of the screen, and the plurality of scan electrodes and the plurality of sustain electrodes are They are arranged horizontally on the screen. The plurality of sustain electrodes are commonly connected. A discharge cell is formed at each intersection of the address electrode, the scan electrode, and the sustain electrode, and each discharge cell forms a pixel on a screen. By applying a write pulse between the address electrode and the scan electrode to the PDP 100, an address discharge is performed between the address electrode and the scan electrode to select a discharge cell, and then, between the scan electrode and the sustain electrode. By applying a periodic sustain pulse that is alternately inverted, sustain discharge is performed between the scan electrode and the sustain electrode to perform display.
[0101]
For example, an ADS (Address and Display-period Separated: address / display period separation) method can be used as a gradation display driving method in the AC type PDP.
[0102]
FIG. 8 is a diagram for explaining the ADS method. The vertical axis in FIG. 8 indicates the scanning direction (vertical scanning direction) of the scan electrodes from the first line to the m-th line, and the horizontal axis indicates time. In the ADS method, one field (1/60 second = 16.67 ms) is temporally divided into a plurality of subfields. For example, when displaying 256 gradations with 8 bits, one field is divided into eight subfields. Each subfield is divided into an address period in which an address discharge for selecting a lighting cell is performed and a sustain period in which a sustain discharge for display is performed. In the ADS method, scanning by address discharge is performed on the entire surface of the PDP from the first line to the m-th line in each subfield, and sustain discharge is performed when the entire address discharge is completed.
[0103]
First, the video signal VD is input to the A / D converter. Further, the horizontal synchronizing signal H and the vertical synchronizing signal V are supplied to a discharge control timing generation circuit, an A / D converter, a scan number converter, and a subfield converter. The A / D converter converts the video signal VD into a digital signal, and provides the image data to a scan number converter. The scanning number converter converts the image data into image data of the number of lines corresponding to the number of pixels of the PDP, and supplies the image data of each line to the subfield converter. The subfield conversion unit divides each pixel data of the image data for each line into a plurality of bits corresponding to a plurality of subfields, and serially outputs each bit of each pixel data to the address driver for each rust field. . The address driver is connected to the power supply circuit 111, converts data serially provided for each subfield from the subfield conversion unit to parallel data, and drives a plurality of address electrodes based on the parallel data.
[0104]
The discharge control timing generation circuit generates discharge control timing signals SC and SU with reference to the horizontal synchronizing signal H and the vertical synchronizing signal V, and supplies them to the scan driver and the sustain driver, respectively. The scan driver includes an output circuit 121 and a shift register 122. The sustain driver includes an output circuit 131 and a shift register 132. These scan driver and sustain driver are connected to a common power supply circuit 123.
[0105]
The shift register of the scan driver shifts the discharge control timing signal SC supplied from the discharge control timing generation circuit in the vertical scanning direction and supplies the same to the output circuit. The output circuit sequentially drives the plurality of scan electrodes in response to the discharge control timing signal SC provided from the shift register.
[0106]
The shift register of the sustain driver supplies the discharge control timing signal SU provided from the discharge control timing generation circuit to the output circuit while shifting in the vertical scanning direction. The output circuit sequentially drives the plurality of sustain electrodes in response to the discharge control timing signal SU provided from the shift register.
[0107]
FIG. 9 is a timing chart showing a driving voltage applied to each electrode of the PDP 100. In FIG. 9, the drive voltage of the address electrode (FIG. 9A), the sustain electrode (FIG. 9B), and the drive voltage of the nth to (n + 2) th (FIGS. 9C to 9E) scan electrodes It is shown. Here, n is an arbitrary integer. As shown in FIG. 9, during the light emission period, a sustain pulse (Psu) is applied to the sustain electrode at a constant cycle. During the address period, a write pulse (Pw) is applied to the scan electrode. A write pulse (Pwa) is applied to the address electrode in synchronization with the write pulse. ON / OFF of the write pulse (Pwa) applied to the address electrode is controlled according to each pixel of the image to be displayed. When the write pulse (Pw) and the write pulse (Pwa) are simultaneously applied, an address discharge occurs in a discharge cell at the intersection of the scan electrode and the address electrode, and the discharge cell is turned on. In the sustain period after the address period, a sustain pulse (Psc) is applied to the scan electrode at a constant cycle.
[0108]
The phase of the sustain pulse (Psc) applied to the scan electrode is shifted by 180 degrees from the phase of the sustain pulse (Psc) applied to the sustain electrode. In this case, the sustain discharge occurs only in the discharge cells lit by the address discharge.
[0109]
At the end of each subfield, an erase pulse (Pe) is applied to the scan electrode. As a result, the wall charge of each discharge cell is reduced to such an extent that disappearance or sustain discharge does not occur, and the sustain discharge ends. During a pause period after the application of the erase pulse (Pe), a pause pulse (Pr) is applied to the scan electrode at a constant cycle. This pause pulse (Pr) has the same phase as the sustain pulse (Psu).
[0110]
The details of the driving method during the sustain period are as described in [Driving Method].
[0111]
(Embodiment 2)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0112]
A driving method of a plasma display panel described in this embodiment and a display device using the same are described in addition to those described in (Embodiment 1), between the third electrode and the second electrode, and / or When the discharge current Isub flows between the first electrode and the third electrode, a back electromotive force Vemf-sub that suppresses fluctuation of the discharge current Isub is generated on the third electrode side.
[0113]
Hereinafter, the present embodiment will be described with reference to specific examples, but embodiments of the present invention are not limited thereto.
[0114]
[Panel structure]
The structure of the panel is the same as in the first embodiment.
[0115]
[Driving method]
FIG. 2 shows voltage waveforms applied to the first electrode 1, the second electrode 2, and the third electrode during the sustain period. First, during a period in which the voltage of the second electrode 2 changes from Hi to Lo, the potential differences between the first electrode 1 and the second electrode 2 and between the third electrode 3 and the second electrode 2 are reduced. The capacitor is discharging. At this time, the discharge starting voltage between the third electrode 3 and the second electrode 2 is sufficiently lower than the discharge starting voltage between the first electrode 1 and the second electrode 2, and in the previous cycle, the third electrode 3 and the third If a sufficient wall charge is formed between the two electrodes 2, the potential difference between the third electrode 3 and the second electrode 2 is reduced, so that a self-erasing discharge is generated between the third electrode 3 and the second electrode 2. Can be made.
[0116]
FIG. 3 shows a state of a waveform of a current flowing through the first electrode 1, the second electrode 2, and the third electrode 3. A current accompanying the self-erasing discharge is observed between the third electrode 3 and the second electrode 2.
In the subsequent period in which the voltage of the first electrode 1 changes from Lo to Hi, a potential difference is generated between the first electrode 1 and the second electrode 2 and between the first electrode 1 and the third electrode 3, and The panel is charged with the electrode 1 being positive and the second electrode 2 and the third electrode 3 being negative. At this time, the voltage was applied so that the potential change speed was 1.0 V / ns or more.
[0117]
Further, an inductance of 100 μH was inserted on the first electrode 1 side of the circuit in order to generate the back electromotive force Vemf-C that suppresses the fluctuation of the charging current of the panel. Therefore, when actually observing the voltage and current waveforms of the first electrode 1, the second electrode 2, and the third electrode 3, the results are as shown in FIG. This makes it possible to increase the electric field intensity applied between the first electrode 1 and the second electrode 2 immediately before the start of discharge.
[0118]
Next, when the self-erasing discharge between the third electrode 3 and the second electrode 2 triggers the discharge, a discharge current Imain flows between the first electrode 1 and the second electrode 2 to emit light.
[0119]
At this time, the 100 μH inductance inserted on the first electrode 1 side of the circuit is used as it is in order to generate the back electromotive force Vemf-main for suppressing the fluctuation of the discharge current. As a result, the discharge current Imain becomes small and the current waveform becomes gentle. At this time, when observing the positive column, it can be seen that it is strongly thick and very stable.
[0120]
Furthermore, at the same time when the discharge starts, a discharge current Isub flows between the third electrode 3 and the second electrode 2 to which no voltage is applied. As described above, by flowing the discharge current Isub, it becomes possible to form wall charges for the trigger discharge of the next cycle between the second electrode 2 and the third electrode 3, and it is possible to sustain the discharge. Become. At this time, an inductance of 100 μH was inserted on the third electrode 3 side of the circuit in order to generate the back electromotive force Vemf-sub that suppresses the fluctuation of the discharge current. Thereby, the discharge current Isub flowing through the third electrode 3 can be suppressed to a necessary minimum.
[0121]
Hereinafter, the next cycle will be described. At this stage, the polarity of the wall charge between the second electrode 2 and the third electrode 3 is on the third electrode 3 side. negative , The second electrode 2 side Correct It is. Also , Continued In addition, during the period when the voltage of the first electrode 1 changes from Hi to Lo, the self-erasing discharge does not occur.
[0122]
In a subsequent period during which the voltage of the second electrode 2 changes from Lo to Hi, a potential difference is generated between the second electrode 2 and the first electrode 1 and between the second electrode 2 and the third electrode 3, The panel is charged with the two electrodes 2 positive and the first and third electrodes 1 and 3 negative. At this time, the voltage was applied so that the potential change speed was 1.0 V / ns or more.
[0123]
Next, a trigger discharge occurs between the second electrode 2 and the third electrode 3 due to the applied voltage and the wall charges between the second electrode 2 and the third electrode 3. At the same time, this is used as a pilot light, and a discharge current Imain flows between the second electrode 2 and the first electrode 1 to emit light. At this time, the 100 μH inductance inserted on the first electrode 1 side of the circuit is used as it is in order to generate the back electromotive force Vemf-main for suppressing the fluctuation of the discharge current. As a result, the discharge current Imain becomes small and has a gentle current waveform.
[0124]
Further, at the same time when the discharge starts, a discharge current Isub flows between the second electrode 2 and the third electrode 3. As described above, by flowing the discharge current Isub, it becomes possible to form wall charges for the self-erase discharge in the next cycle between the second electrode 2 and the third electrode 3, and the discharge can be sustained. It becomes possible.
[0125]
In the sustain period, light emission is continuously performed by repeating the above.
If the back electromotive force Vemf-C is not generated, an inductance may be inserted immediately before the discharge.
[0126]
By driving in this manner, a panel in which the distance between the first electrode 1 and the second electrode 2 is 0.5 mm and the distance between the first substrate 11 and the opposing second substrate 12 is 0.12 mm, A sustain voltage of 245 V and a luminous efficiency of about 2.6 lm / W were obtained. Further, the deterioration of the phosphor layer formed on the third electrode 3 could be suppressed.
[0127]
Further, a phenomenon in which a self-erasing discharge is not generated between the third electrode 3 and the second electrode 2, a phenomenon in which a self-erasing discharge is not used as a trigger even if a self-erasing discharge is generated, or a phenomenon caused by inductance. A phenomenon when the back electromotive force Vemf-main is not generated, a phenomenon when the magnitude of the inductance is changed or a driving voltage is increased, and a process of generating a potential difference between the first electrode 1 and the second electrode 2 In the above, a phenomenon when the rate of change of the potential is changed, means for forcibly generating a trigger discharge, means for generating the back electromotive force Vemf-main, Vemf-C, and forcibly setting the discharge current Isub The means for flowing the current through the counter and the means for controlling the back electromotive force Vemf-main with respect to the display amount are the same as those in the first embodiment.
[0128]
[Display device]
The display device is the same as in the first embodiment. The details of the driving method during the sustain period are as described in [Driving Method].
[0129]
(Embodiment 3)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0130]
A driving method of a plasma display panel described in this embodiment and a display device using the same are the same as those described in (Embodiment 1) and (Embodiment 2). The distance between the second electrodes is 0.2 mm or more.
[0131]
In addition, the first electrode and the second electrode are formed on a first substrate, and a distance between the first substrate and the opposing second substrate is 0.15 mm or more.
[0132]
Further, a plurality of the third electrodes are formed in one display cell (minimum display unit).
[0133]
Further, a projection is formed between a plurality of the third electrodes formed in one display cell (minimum display unit).
[0134]
Further, the first electrode and the second electrode are formed on the first substrate, and the third electrode is formed on the first substrate so as to intersect the first electrode and the second electrode via a dielectric. It is characterized by.
[0135]
In addition, a first electrode and a second electrode are formed on a first substrate, and a third electrode is formed on a second substrate facing the first substrate so as to intersect the first electrode and the second electrode. It is characterized by having.
[0136]
Further, a first electrode and a second electrode are formed on a first substrate, and a float electrode is formed between adjacent display cells (minimum display units) on the first substrate.
[0137]
Hereinafter, the present embodiment will be described with reference to specific examples, but embodiments of the present invention are not limited thereto.
[0138]
[Driving method] is the same as in the first embodiment. [Display device] is basically the same as that of the first embodiment, except for the structure of the panel. Hereinafter, only different portions will be described.
[0139]
[Panel structure]
FIG. 1 is a perspective view of a plasma display panel (PDP) used in the first embodiment. The PDP of FIG. 1 has a first electrode 1 and a second electrode that are substantially parallel to each other on the inner surface of one first substrate 11 of a pair of substrates sandwiching a discharge space, and the inner surface of the other second substrate 12 It has a third electrode 3 that intersects the first electrode 1 and the second electrode 2, a partition 16 that partitions a discharge space for each unit light emitting area EU, and a phosphor 17 that emits light by discharge. The distance between the first electrode 1 and the second electrode 2 is 0.2 mm or more.
[0140]
When the driving method according to the present embodiment is performed on the panel of FIG. 1, the distance between the first electrode 1 and the second electrode 2 is 0.5 mm, and the first substrate 11 With a panel having a distance of 0.12 mm, a sustain voltage of 245 V and a luminous efficiency of 2.54 lm / W were obtained.
[0141]
This is the result shown in the first embodiment.
[0142]
The same driving was performed on the panel having this structure while changing the distance between the first substrate 11 and the opposing second substrate 12 from 0.12 mm to 0.25 mm. As a result, it was found that the luminous efficiency was particularly increased at 0.15 mm or more. For example, when the distance between the first substrate 11 and the opposing second substrate 12 is 0.18 mm, a sustaining voltage of 240 V and a luminous efficiency of 2.78 lm / W can be obtained.
[0143]
In the PDP of FIG. 10, a plurality of the third electrodes 3 are formed in one display cell (minimum display unit).
[0144]
When the driving method according to the present embodiment is performed on the panel of FIG. 10, the distance between the first electrode 1 and the second electrode 2 is 0.5 mm, and the first substrate 11 and the opposing second substrate 12 With a panel having a distance of 0.12 mm, a sustain voltage of 245 V and a luminous efficiency of 2.94 lm / W were obtained.
[0145]
In addition, a panel in which the distance between the first electrode 1 and the second electrode 2 is 0.5 mm, the distance between the first substrate 11 and the opposing second substrate 12 is 0.18 mm, the sustain voltage is 250 V, and the luminous efficiency is 3 .14 lm / W was obtained. The luminous efficiency can be further increased by further increasing the number of the third electrodes 3.
[0146]
In the PDP of FIG. 11, a projection 18 is formed between a plurality of the third electrodes 3 formed in one display cell (minimum display unit).
[0147]
When the driving method according to the present embodiment is performed on the panel of FIG. 11, the distance between the first electrode 1 and the second electrode 2 is 0.5 mm, and the first substrate 11 and the opposing second substrate 12 With a panel having a distance of 0.18 mm and a height of the protrusion 18 of 0.12 mm, a sustaining voltage of 250 V and a luminous efficiency of 3.40 lm / W were obtained.
[0148]
In the PDP of FIG. 12, a first electrode 1 and a second electrode 2 are formed on a first substrate 11, and a float electrode 4 is formed between adjacent display cells (minimum display units) on the first substrate 11.
[0149]
By applying the driving method according to the present embodiment to the panel shown in FIG. 12, crosstalk and flickering of discharge can be suppressed. Furthermore, by forming a plurality of the float electrodes 4 between adjacent display cells (minimum display units) on the first substrate 11 and connecting them, the flickering of discharge could be further suppressed.
[0150]
In the PDP of FIG. 13, the first electrode 1 and the second electrode 2 are formed on the first substrate 11, and the third electrode 3 intersects the first electrode 1 and the second electrode 2 via a dielectric. It is formed on one substrate 11. Thus, a material having a high secondary electron emission coefficient, for example, MgO can be used as a protective film on all three types of electrodes.
[0151]
By applying the driving method of the present embodiment to the panel of FIG. 13, the sustain voltage could be reduced by about 10V. Further, it has been found that the third electrode can be used as a cathode.
[0152]
In the PDP of FIG. 14, the first electrode 1 and the second electrode 2 are formed on the first substrate 11, and the third electrode 3 intersects the first electrode 1 and the second electrode 2 via a dielectric. It is formed on one substrate 11. Further, a plurality of the third electrodes 3 are formed in one display cell (minimum display unit).
[0153]
By applying the driving method according to the present embodiment to the panel of FIG. 14, the sustain voltage can be reduced and the luminous efficiency can be increased.
[0154]
In the PDP shown in FIG. 15, the first electrode 1 and the second electrode 2 are formed on the first substrate 11 and the third electrode 3 intersects the first electrode 1 and the second electrode 2 via a dielectric. It is formed on one substrate 11. Further, a projection 18 is formed between a plurality of the third electrodes 3 formed in one display cell (minimum display unit).
[0155]
By applying the driving method according to the present embodiment to the panel in FIG. 15, the sustain voltage can be reduced, and the luminous efficiency can be further increased.
[0156]
【The invention's effect】
As described above, according to the present invention, Since the self-erasing discharge can be used as a trigger discharge, the positive column discharge in the next cycle can be generated at a low voltage.
[0157]
In addition, by using the third electrode for trigger discharge, wall charges between the first electrode and the second electrode can be effectively used without decreasing. Further, by flowing a discharge current Isub between the third electrode and the second electrode or / and between the first electrode and the third electrode, it becomes possible to form wall charges for a trigger discharge in the next cycle, Discharge can be sustained stably.
[0158]
Further, when the discharge current Imain flows between the first electrode and the second electrode to emit light, the back electromotive force Vemf-main that suppresses fluctuation of the discharge current is applied to the first electrode and / or the second electrode. The generation and increase of the potential difference between the first electrode and the second electrode, and between the first electrode and the third electrode, and / or between the third electrode and the second electrode, cause the charge and discharge of the panel. By generating the back electromotive force Vemf-C that suppresses the fluctuation of the current, and when flowing the discharge current Isub between the third electrode and the second electrode or / and between the first electrode and the third electrode, By generating the back electromotive force Vemf-sub on the three electrode side for suppressing the fluctuation of the discharge current Isub, the fluctuation of the discharge current Imain is suppressed by the back electromotive force Vemf-main, and the positive column discharge can be stably formed. It becomes possible and the discharge It can can be suppressed.
[0159]
In addition, the positive column discharge thus formed has a very high efficiency and can obtain a strong luminous intensity. Further, immediately before the discharge, the back electromotive force Vemf-C can suppress a decrease in the charge / discharge current of the panel, and can substantially increase the voltage applied to the discharge space, so that a strong luminous intensity can be obtained. .
[0160]
Further, the discharge current Isub flowing to the third electrode can be suppressed to a necessary minimum by the back electromotive force Vemf-sub. Thus, for example, in a panel in which a phosphor layer or the like is formed on the third electrode, deterioration of the phosphor layer can be suppressed.
[0161]
As described above, by controlling the positive column discharge, it is possible to provide a plasma display panel capable of achieving high luminance, high luminous efficiency, and stable discharge. Has the advantageous effect of .
[Brief description of the drawings]
FIG. 1 is a perspective view of a plasma display panel (PDP) according to Embodiment 1 of the present invention.
FIG. 2 is a diagram showing a voltage waveform output from a circuit to each electrode according to the first embodiment.
FIG. 3 is a diagram showing voltage and current waveforms observed at each electrode in the first embodiment.
FIG. 4 is a diagram showing voltage and current waveforms of respective electrodes when back electromotive force Vemf-main in the first embodiment is not generated.
FIG. 5 is a diagram showing a waveform of an applied voltage when a back electromotive force is generated by a pulse according to the first embodiment.
FIG. 6 is a diagram showing a waveform of an applied voltage when a discharge current Isub is forcibly applied in the first embodiment.
FIG. 7 is a block diagram showing a configuration of a display device according to the first embodiment.
FIG. 8 is a conceptual diagram illustrating an ADS method according to the first embodiment.
FIG. 9 is a timing chart showing a drive voltage applied to each electrode of the PDP according to the first embodiment.
FIG. 10 is an exploded perspective view of a plasma display panel (PDP) according to Embodiment 3 of the present invention.
FIG. 11 is an exploded perspective view of a plasma display panel (PDP) according to the third embodiment.
FIG. 12 is an exploded perspective view of a plasma display panel (PDP) according to the third embodiment.
FIG. 13 is an exploded perspective view of a plasma display panel (PDP) according to the third embodiment.
FIG. 14 is an exploded perspective view of a plasma display panel (PDP) according to the third embodiment.
FIG. 15 is an exploded perspective view of a plasma display panel (PDP) according to the third embodiment.
FIG. 16 is an exploded perspective view of a conventional surface discharge type PDP having a three-electrode structure.
[Explanation of symbols]
1 First electrode
2 Second electrode
3 Third electrode
4 Float electrode
11 1st substrate
12 Second substrate
13 Dielectric layer
14 Protective film
15 Dielectric layer (overcoat layer)
16 Partition
17 phosphor
18 Projection
21 scan electrode
22 Sustain electrode
23 Address electrode
100 PDP
110 address driver
111 Address driver power supply circuit
120 scan driver
121 Scan Driver Output Circuit
122 Shift register of scan driver
123 Power supply circuit common to scan driver and sustain driver
130 Sustain driver
131 Sustain driver output circuit
132 Sustain driver shift register
140 discharge control timing generation circuit
151 A / D converter
152 scan number converter
153 Subfield converter

Claims (20)

At least three types of electrodes, a first electrode, a plasma display panel having a second electrode and a third electrode, during the sustain period, between the first electrode and the second electrode, and between the first electrode and the third electrode, or And / or when a potential difference between the third electrode and the second electrode is reduced, a self-erasing discharge is generated between the third electrode and the second electrode, or / and between the first electrode and the third electrode, and the first electrode Between the first electrode and the second electrode, and between the first electrode and the third electrode, or / and when the potential difference between the third electrode and the second electrode is increased, the self-erasing discharge is used as a trigger to trigger the first electrode and the second electrode. A plasma characterized by flowing a first discharge current Imain between electrodes to emit light, and flowing a second discharge current Isub between a third electrode and a second electrode or / and between a first electrode and a third electrode. Display panel driving method. For a plasma display panel having at least three types of electrodes, a first electrode, a second electrode, and a third electrode, during the sustain period, between the third electrode and the second electrode, or between the first electrode and the third electrode. When a trigger discharge is generated, and the trigger discharge is used as a trigger to increase the potential difference between the first electrode and the second electrode, a first discharge current Imain flows between the first electrode and the second electrode to emit light. And driving a second discharge current Isub between the third electrode and the second electrode or / and between the first electrode and the third electrode. 3. The method according to claim 1, wherein the discharge is continued by using the self-erasing discharge or the trigger discharge as a trigger in the next cycle. When the first discharge current Imain is caused to flow between the first electrode and the second electrode to emit light, a back electromotive force Vemf-main that suppresses a variation in the discharge current is provided on the first electrode side and / or the second electrode side. the driving method of a plasma display panel according to any one of claims 1 to 3, characterized in that to generate. When the potential difference between the first electrode and the second electrode, and between the first electrode and the third electrode, and / or between the third electrode and the second electrode is increased, the reverse of suppressing the fluctuation of the charge / discharge current of the panel is performed. the driving method of a plasma display panel according to any one of claims 1 to 4, characterized in that to generate an electromotive force Vemf-C. When flowing the second discharge current Isub between the third electrode and the second electrode or / and between the first electrode and the third electrode, the reverse of suppressing the fluctuation of the second discharge current Isub on the third electrode side the driving method of a plasma display panel according to any one of claims 1 to 5, characterized in that to generate an electromotive force Vemf-sub. The peak value of the first discharge current Imain flowing between the first electrode and the second electrode is
It claims 4 to a driving method of 6 plasma display panel according to any of characterized in that it reduced by 10% or more by Vemf-main. The second discharge current Isub between the third electrode and the second electrode or / and between the first electrode and the third electrode flows at least 10% of the sum of the first discharge current Imain and the second discharge current Isub the driving method of a plasma display panel according to any one of claims 1 to 7, characterized in that. A plasma display device characterized by using the driving method of the plasma display panel according to any one of claims 1 to 8. Between the third electrode and the second electrode, or / and the discharge start voltage between the third electrode and the second electrode, to claim 9, wherein the smaller than the discharge start voltage between the first electrode and the second electrode The plasma display device according to the above. The plasma according to claim 9 or 10 , wherein a distance between the third electrode and the second electrode or / and a distance between the third electrode and the second electrode is smaller than a distance between the first electrode and the second electrode. Display device. The plasma display device according to any one of claims 9 to 11, wherein an inductance is inserted in series on the first electrode side and / or the second electrode side. Peak value of the first discharge current Imain flowing between the first electrode and the second electrode, the plasma display apparatus of claim 1 2, wherein the decrease of 10% or more by the inductance. The plasma display device according to any one of claims 9 to 1 3 the distance between the second electrode and the first electrode is equal to or is 0.2mm or more. Said second electrode and the first electrode is formed on the first substrate, a first substrate, to the distance between the second substrate facing the claims 9, wherein it is 0.15mm or more of any one of 1 4 Plasma display device. In one display cell (display resolution), a plasma display device according to any one of the claims 9 to 1 5 wherein the third electrode is characterized by being a plurality of formed. 17. The plasma display device according to claim 16 , wherein a protrusion is formed between the plurality of third electrodes formed in one display cell (minimum display unit). A first electrode and a second electrode are formed on a first substrate, and a third electrode is formed on the first substrate so as to intersect the first electrode and the second electrode via a dielectric. The plasma display device according to any one of claims 9 to 17 , wherein A first electrode and a second electrode are formed on a first substrate, and a third electrode is formed on a second substrate facing the first substrate so as to intersect the first electrode and the second electrode. The plasma display device according to any one of claims 9 to 18 , wherein: A first electrode and a second electrode formed on the first substrate, the claims 9 to 19, characterized in that said first adjacent display cells (minimum display unit) on the substrate between the floating electrode is formed The plasma display device according to any one of the above.

Images