WO2007069598A1 - プラズマディスプレイパネルの駆動方法およびプラズマディスプレイ装置 - Google Patents
プラズマディスプレイパネルの駆動方法およびプラズマディスプレイ装置 Download PDFInfo
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- WO2007069598A1 WO2007069598A1 PCT/JP2006/324748 JP2006324748W WO2007069598A1 WO 2007069598 A1 WO2007069598 A1 WO 2007069598A1 JP 2006324748 W JP2006324748 W JP 2006324748W WO 2007069598 A1 WO2007069598 A1 WO 2007069598A1
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- discharge
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Classifications
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Definitions
- the present invention relates to a plasma display panel driving method and a plasma display device.
- the present invention relates to a method for driving a plasma display panel and a plasma display device.
- a typical AC surface discharge type panel as a plasma display panel (hereinafter abbreviated as “panel”) has a large number of discharge cells formed between a front plate and a back plate arranged opposite to each other. Yes.
- a plurality of pairs of display electrodes consisting of a pair of scan electrodes and sustain electrodes are formed 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 electrode pairs.
- the back plate is formed with 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 with the data electrodes on the back side glass substrate.
- a phosphor layer is formed on the surface and the side surfaces of the barrier ribs. Then, the front plate and the back plate are arranged opposite to each other so that the display electrode pair and the data electrode are three-dimensionally crossed and sealed, and a discharge gas containing xenon is sealed in the internal discharge space.
- a discharge cell is formed at a portion where the display electrode pair and the data electrode face each other. In the panel having such a configuration, ultraviolet rays are generated by gas discharge in each discharge cell, and RGB phosphors of each color are excited and emitted by the ultraviolet rays to perform color display.
- a subfield method that is, a method of dividing a field period into a plurality of subfields and performing gradation display by combining subfields to emit light is generally used. It is.
- Each subfield has an initialization period, an address period, and a sustain period.
- an initialization discharge is generated, and wall charges necessary for the subsequent address operation are formed on each electrode.
- address discharge is selectively generated in the discharge cells to be displayed to form wall charges.
- a sustain pulse is alternately applied to the display electrode pair composed of the scan electrode and the sustain electrode, and a sustain discharge is generated in the discharge cell in which the address discharge is generated, and the phosphor layer of the corresponding discharge cell is formed.
- the image is displayed by emitting light.
- gradation discharge is performed by performing initializing discharge using a slowly changing voltage waveform and selectively performing initializing discharge on discharge cells that have undergone sustain discharge.
- a novel driving method has been disclosed in which light emission unrelated to the above is reduced as much as possible to improve the contrast ratio (see, for example, Patent Document 1).
- Patent Document 1 discloses a so-called narrow erase discharge in which the pulse width of the last sustain pulse in the sustain period is made shorter than the pulse widths of other sustain pulses, and the potential difference due to wall charges between display electrodes is alleviated. Ny, even though it is listed. By stably generating this narrow erase discharge, a reliable address operation can be performed in the subsequent subfield address period, and a plasma display device with a high contrast ratio can be realized.
- Patent Document 1 Japanese Patent Laid-Open No. 2000-242224
- the present invention has been made in view of these problems, and generates a stable address discharge without increasing the voltage necessary to generate the address discharge even in a large screen 'high brightness panel. Therefore, the present invention provides a panel driving method and a plasma display device.
- the present invention is a method for driving a panel including a plurality of discharge cells each having a display electrode pair consisting of a scan electrode and a sustain electrode, wherein one field period is a discharge cell. It consists of a plurality of subfields having an address period in which an address discharge is selectively generated and a sustain period in which a sustain discharge is generated a number of times according to the luminance weight in the discharge cell in which the address discharge is generated. After a voltage for generating the last sustain discharge in the period is applied to the display electrode pair, a time interval corresponding to the lighting rate of the discharge cell in that subfield is set, and the potential difference between the electrodes of the display electrode pair is set. A voltage for relaxation is applied to the display electrode pair.
- FIG. 1 is an exploded perspective view showing a main part of a panel used in Embodiment 1 of the present invention.
- FIG. 2 is an electrode array diagram of the panel.
- FIG. 3 is a circuit block diagram of a plasma display device using the panel.
- FIG. 4 is a diagram showing drive voltage waveforms applied to the electrodes of the panel.
- FIG. 5 is a diagram showing a relationship among a subfield, a lighting rate, and an erasing phase difference in the first embodiment of the present invention.
- FIG. 6 is a circuit diagram of a sustain pulse generator of the plasma display device in accordance with the first exemplary embodiment of the present invention.
- FIG. 7 is a timing chart for explaining the operation of the sustain pulse generator of the plasma display device in accordance with the first exemplary embodiment of the present invention.
- FIG. 8A is a diagram schematically showing a relationship between an address noise voltage and an erase phase difference necessary for generating a normal address discharge.
- FIG. 8B is a diagram schematically showing the relationship between the scan pulse voltage necessary for generating a normal address discharge and the erase phase difference.
- FIG. 8C is a diagram schematically showing the relationship between the scan pulse voltage necessary for the address discharge and the lighting rate.
- FIG. 8D is a diagram schematically showing the relationship between the scan pulse voltage necessary for generating a normal address discharge, the erase phase difference, and the lighting rate.
- Fig. 9 is a diagram showing a value of a scan pulse voltage at which the second type of write failure does not occur.
- FIG. 10 is a diagram showing a relationship among subfields, lighting rates, and erase phase differences in the second embodiment of the present invention.
- FIG. 11 is a diagram showing a relationship between a lighting rate and an erasing phase difference in the second embodiment of the present invention.
- the present invention is a method for driving a panel including a plurality of discharge cells each having a display electrode pair including a scan electrode and a sustain electrode, wherein address discharge is selectively generated in the discharge cell in one field period. It is composed of a plurality of subfields having an address period and a sustain period in which a sustain discharge is generated a number of times according to the luminance weight in the discharge cell in which the address discharge is generated, and for generating the last sustain discharge in the sustain period After a voltage is applied to the display electrode pair, a voltage is applied to the display electrode pair for relaxing the potential difference between the electrodes of the display electrode pair by setting a time interval according to the lighting rate of the discharge cell in the subfield. It is characterized by this. By this method, even for a large screen 'high brightness panel', a stable address discharge can be generated without increasing the voltage required to generate the address discharge, and a panel drive method with good image display quality can be achieved. Can be provided.
- the time interval when the discharge cell lighting rate is high is controlled to be longer than the time interval when the discharge cell lighting rate is low. It is desirable to include at least one in a field period.
- the time interval in the subfield with a small luminance weight may be controlled to be equal to or shorter than the luminance interval, the time interval in the subfield, or the like.
- the plasma display device of the present invention includes a panel including a plurality of discharge cells each having a display electrode pair composed of a scan electrode and a sustain electrode, and a drive circuit for driving the panel.
- the field period is composed of a plurality of subfields having a write period in which an address discharge is selectively generated in the discharge cells and a sustain period in which the sustain discharge is generated a number of times corresponding to the luminance weight in the discharge cells in which the address discharge is generated.
- a first switching element that applies a voltage for generating a sustain discharge to the display electrode pair, and a second switching that applies a voltage to the display electrode pair for reducing the potential difference between the electrodes of the display electrode pair.
- the first switching element is turned on and then the discharge cells in that subfield are turned on.
- time interval corresponding to, characterized in that to turn on the second switching element is also enables a panel drive method that generates stable address discharge without increasing the voltage required to generate address discharge, even on large-screen 'high-luminance panels, and provides high image display quality. Can be provided.
- the plasma display device of the present invention further includes a lighting rate calculation circuit that calculates the lighting rate of the discharge cells for each subfield based on the image data for each subfield, and the drive circuit includes the lighting of the discharge cells. It is desirable to include at least one subfield in one field period to control the time interval when the rate is high to be longer than the time interval when the lighting rate of the discharge cells is low.
- the driving circuit of the plasma display device of the present invention may control the time interval in the subfield with a small luminance weight to be equal to or shorter than the time interval in the subfield with a large luminance weight. . This method can further improve the display image quality.
- the time interval of the panel driving method of the present invention is switched based on a comparison between the lighting rate of the discharge cells in the current subfield and a predetermined threshold value.
- the value is greater than the threshold when switching from the second time interval to the first time interval! May be set to a / value.
- FIG. 1 is an exploded perspective view showing a main part of a panel used in Embodiment 1 of the present invention.
- the panel 10 is configured such that a glass front substrate 21 and a rear substrate 31 are arranged to face each other and a discharge space is formed therebetween.
- a plurality of scanning electrodes 22 and sustaining electrodes 23 constituting a display electrode pair are formed in parallel with each other.
- a dielectric layer 24 is formed so as to cover the scan electrode 22 and the sustain electrode 23, and a protective layer 25 is formed on the dielectric layer 24.
- a plurality of data electrodes 32 covered with an insulating layer 33 are provided on the back substrate 31, and a grid-like partition wall 34 is provided on the insulating layer 33.
- the phosphor layer 35 is provided on the surface of the insulator layer 33 and the side surfaces of the partition walls 34.
- the front substrate 21 and the rear substrate 31 are arranged to face each other so that the scan electrode 22 and the sustain electrode 23 intersect with the data electrode 32, and in the discharge space formed between them, for example, neon And a mixed gas of xenon.
- the structure of the panel is not limited to the one described above, and may be, for example, a striped partition.
- FIG. 2 is an electrode array diagram of the panel used in Embodiment 1 of the present invention.
- M x n are formed inside.
- FIG. 3 is a circuit block diagram of the plasma display device in accordance with the first exemplary embodiment of the present invention.
- the plasma display device includes a panel 10, an image signal processing circuit 51, a data electrode drive circuit 52, a scan electrode drive circuit 53, a sustain electrode drive circuit 54, a timing generation circuit 55, a lighting rate calculation circuit 58, and a power supply circuit (not shown). )).
- the image signal processing circuit 51 converts the image signal Sig into image data for each subfield.
- the data electrode driving circuit 52 receives image data for each subfield from each data electrode Dl to The signal is converted into a signal corresponding to Dm and each data electrode Dl to Dm is driven.
- the lighting rate calculation circuit 58 calculates the lighting rate of the discharge cells for each subfield based on the image data for each subfield, that is, the ratio of the number of discharge cells to be lit to the total number of discharge cells.
- the timing generation circuit 55 generates various timing signals based on the horizontal synchronization signal H, the vertical synchronization signal V, and the lighting rate calculated by the lighting rate calculation circuit 58, and supplies them to each circuit block.
- Scan electrode drive circuit 53 supplies drive voltage waveforms to scan electrodes SCl to SCn based on timing signals
- sustain electrode drive circuit 54 supplies drive voltage waveforms to sustain electrodes SU1 to SUn based on timing signals.
- scan electrode driving circuit 53 includes sustain pulse generating section 100 for generating a sustain pulse, which will be described later, and sustain electrode driving circuit 54 is similarly provided with sustain pulse generating section 200.
- FIG. 4 is a diagram showing a drive voltage waveform applied to each electrode of the panel used in Embodiment 1 of the present invention.
- One field is divided into a plurality of subfields, and each subfield has an initialization period, It has a writing period and a maintenance period.
- the data electrodes Dl to Dm and the sustain electrodes SUl to SUn are held at 0 V, and are set to be equal to or lower than the discharge start voltage with respect to the scan electrodes SCl to SCn. Apply a ramp voltage that gradually increases from Vil to a voltage Vi2 that exceeds the discharge start voltage. Then, a weak initializing discharge occurs in all discharge cells, negative wall voltage is accumulated on scan electrodes SCl to SCn, and positive wall voltage is accumulated on sustain electrodes SUl to SUn and data electrodes D1 to Dm. Is done.
- the wall voltage on the electrode refers to the voltage generated by the wall charge accumulated on the dielectric layer or phosphor layer covering the electrode.
- the sustain electrodes SUl to SUn are maintained at the positive voltage Vel, and the ramp voltage gradually decreasing from the voltage Vi3 to the voltage Vi4 is applied to the scan electrodes SCl to SCn. Apply.
- weak initializing discharge occurs again in all discharge cells.
- the wall voltage between the scan electrodes SCl to SCn and the sustain electrodes SU1 to SUn is weakened, and the positive wall voltage on the data electrodes D1 to Dm is adjusted to a value suitable for the write operation.
- the initialization operation of the first SF is an all-cell initialization operation in which initialization discharge is performed on all discharge cells.
- sustain electrodes SU1 to SUn are held at voltage Ve2, and scan electrodes SCl to SCn are held at voltage Vc.
- Vd positive write pulse voltage
- a positive sustain pulse voltage Vs is applied to scan electrodes SCl to SCn, and a ground potential, that is, OV is applied to sustain electrodes SUl to SUn.
- the voltage between scan electrode SCi and sustain electrode SUi is the sum of sustain pulse voltage Vs and the wall voltage on scan electrode SCi and the wall voltage on sustain electrode SUi. The discharge start voltage is exceeded.
- a sustain discharge occurs between scan electrode SCi and sustain electrode SUi, and phosphor layer 35 emits light by the ultraviolet rays generated at this time.
- Negative wall voltage is accumulated on scan electrode SCi, and positive wall voltage is accumulated on sustain electrode SUi.
- a positive wall voltage is accumulated on the data electrode Dk.
- the sustain period voltage corresponding to the luminance weight is alternately applied to the scan electrodes SC1 to SCn and the sustain electrodes SU1 to SUn, and a potential difference is applied between the electrodes of the display electrode pair, whereby the address period In FIG. 5, sustain discharge is continuously performed in the discharge cell in which the address discharge has occurred.
- the voltage Vel is applied to the sustain electrodes SU1 to SUn before the discharge converges, that is, while charged particles generated by the discharge remain sufficiently in the discharge space!
- the potential difference between the sustain electrode SUi and the scan electrode SCi is weakened to the extent of (Vs ⁇ Vel).
- the wall voltage between the scan electrodes SCl to SCn and the sustain electrodes SUl to SUn is the difference between the voltages applied to the electrodes (Vs — It can be weakened to the extent of Vel).
- this discharge is referred to as “erase discharge”
- the potential difference applied between the scan electrodes SCl to SCn and the sustain electrodes SUl to SUn in order to generate the erase discharge is a narrow pulse-shaped potential difference.
- the sustain electrodes SU1 to SUn are held at the voltage Vel and the data electrodes D1 to Dm are held at the OV, respectively, and the scan electrodes SCl to SCn are gradually moved from the voltage Vi3 'to the voltage Vi4. Apply ramp-down voltage. Then, a weak initializing discharge is generated in the discharge cell that has been subjected to the sustain discharge in the sustain period of the previous subfield, and the wall voltage on the scan electrode SCi and the sustain electrode SUi is weakened.
- the wall voltage on the scan electrode SCi and the sustain electrode SUi is weakened.
- the wall voltage suitable for the write operation is obtained. Adjusted to On the other hand, in a discharge cell that does not sustain discharge in the previous subfield, the wall charge at the end of the initializing period of the previous subfield is maintained as it is.
- the initializing operation of the second SF is a selective initializing operation in which initializing discharge is selectively performed on the discharge cells that have undergone the sustain operation in the sustain period of the immediately preceding subfield.
- the operation during the writing period of the second SF is the same as that of the first SF, and thus the description thereof is omitted.
- the operation in the subsequent sustain period is the same except for the number of sustain pulses.
- the operation in the initialization period in the 3rd to 10th SFs is the same selective initialization operation as in the 2nd SF, and the write operation in the write period is the same as that in the 2nd SF.
- the erase phase difference Thl of the voltage applied to each of the display electrode pairs at the end of the sustain period is controlled by the subfield and the lighting rate of the subfield.
- the erase phase difference Thl is controlled to be 150 ns regardless of the lighting rate.
- the erase phase difference Thl is 150 ns
- the erase phase difference Thl is 200 ns and the lighting rate is 70%.
- the erase phase difference Thl is controlled to be 300 ns.
- FIG. 6 is a circuit diagram of sustain pulse generating units 100 and 200 of the plasma display device in accordance with the first exemplary embodiment of the present invention.
- the sustain pulse generating unit 100 includes an electric power recovery unit 110 and a clamp unit 120.
- the power recovery unit 110 includes a power recovery capacitor C10, switching elements Ql l and Q12, backflow prevention diodes Dl l and D12, and a power recovery inductor L10.
- the clamp unit 120 includes a power supply VS having a voltage value of Vs and switching elements Q13 and Q14.
- the power recovery unit 110 and the clamp unit 120 are connected to the scan electrode 22 which is one end of the interelectrode capacitance Cp of the panel 10 via a scan pulse generation circuit. Note that the scan pulse generation circuit is not shown in FIG. Capacitor C10 has a sufficiently large capacity compared to the interelectrode capacitance Cp, and the voltage value is charged to approximately VsZ2, and functions as a power source for power recovery unit 110.
- Sustain pulse generator 200 has the same circuit configuration as sustain pulse generator 100.
- Power recovery capacitor C20, switching elements Q21 and Q22, backflow prevention diodes D21 and D22, and power recovery inductor L20 A power recovery unit 210 and a clamp unit 220 having a power source VS, switching elements Q23 and Q24, and the output of the sustain pulse generator 200 is the sustain electrode 23 which is the other end of the interelectrode capacitance Cp of the panel 10. It is connected to the.
- FIG. 6 also shows a power supply VE for applying the voltage Vel to the sustain electrode 23 and switching elements Q28 and Q29.
- FIG. 7 is a timing chart for explaining the operation of sustain pulse generating units 100 and 200 of the plasma display device in accordance with the first exemplary embodiment of the present invention, and is a detailed timing chart of a portion surrounded by a broken line in FIG. is there.
- one sustain pulse period is divided into six periods indicated by T1 to T6, and each period is described.
- switching element Q21 is turned on at time t2. Then, current begins to flow from the power recovery capacitor C20 through the switching element Q21, the diode D21, and the inductor L20, and the voltage of the sustain electrode 23 begins to rise.
- the above-described resonance period is set to about 1200 ns, and the time from time tl to time t2, that is, the time of period T1 is set to 550 ns.
- Switching element Q12 may be turned off after time t2 and before time t5.
- Switching element Q21 may be turned off after time t3 and before time t4.
- switching element Q14 is preferably turned off immediately before time t5, and switching element Q23 is preferably turned off immediately before time t4.
- Period T7 This period is the fall of the sustain pulse applied to sustain electrode 23, and is the same as period T4. That is, when switching element Q22 is turned on at time t7, the charge on sustain electrode 23 side begins to flow to capacitor C20 through inductor L20, diode D22, and switching element Q22, and the voltage on sustain electrode 23 begins to drop.
- switching element Q24 is turned on to forcibly reduce the voltage of sustain electrode 23 to OV. Then, the switching element Q11 is turned on. Then, current begins to flow from the capacitor C10 for power recovery through the switching element Ql l, the diode Dl l, and the inductor L10, and the voltage of the scan electrode 22 begins to rise.
- Period T10 At time tlO, switching element Q28 and switching element Q29 are turned on. Then, since the sustain electrode 23 is directly connected to the power source VE through the switching elements Q28 and Q29, the voltage of the sustain electrode 23 is forcibly increased to Vel.
- Time tlO is the time before the discharge generated in period T9 converges, that is, the charged particles generated in the discharge remain sufficiently in the discharge space. Since the electric field in the discharge space changes while the charged particles remain sufficiently in the discharge space, the charged particles are rearranged to relax the changed electric field to form wall charges. At this time, the difference between the voltage Vs applied to the scan electrode 22 and the sustain electrode 23 is small, and the wall voltage on the scan electrode 22 and the sustain electrode 23 is small.
- the potential difference that generates the last sustain discharge is a narrow pulse-shaped potential difference that is changed so as to relax the potential difference applied between the electrodes of the display electrode pair before the last sustain discharge converges.
- Maintenance that occurs The discharge is an erasing discharge.
- the data electrode 32 is held at OV, and the charged particles caused by the discharge are wall charges so as to reduce the potential difference between the voltage applied to the data electrode 32 and the voltage applied to the scan electrode 22. Therefore, a positive wall voltage is formed on the data electrode 32.
- the erase phase difference Thl is the voltage Vs 1 for relaxing the potential difference between the electrodes of the display electrode pair after the voltage Vs for generating the erase discharge is applied to the scan electrode 22, and the sustain electrode 23
- the control is performed using a switching element. That is, the switching element Q 13 as the first switching element for applying the voltage Vs for generating the sustain discharge to the scanning electrode 22 and the voltage Vel for reducing the potential difference between the electrodes of the display electrode pair are set.
- Switching elements Q28 and Q29 which are second switching elements to be applied to the sustain electrodes. After turning on the switching element Q13, a time interval (hereinafter referred to as “erasing position”) corresponding to the lighting rate of the discharge cells in the subfield.
- the switching elements Q28 and Q29 are turned on with a phase difference Th2 ”.
- the erasure phase difference Thl and the erasure phase difference Th2 may not be exactly equal, but may be considered to be practically equivalent unless there is a large difference in the delay time of the switching elements. Therefore, in the following, the erasure phase difference Thl and the erasure phase difference Th2 are not distinguished from each other and are simply referred to as the erasure phase difference Th.
- the time from time t9 to time tlO, that is, the time of period T9 is the erasing phase difference Th and is controlled by the subfield and the lighting rate of the subfield, as shown in FIG. . That is, in the first SF to the fourth SF, the erase phase difference Th is controlled to be 150 ns regardless of the lighting rate. In the 5th to 10th SF, when the lighting rate is less than 44%, the erase phase difference Th is 150 ns, and when the lighting rate is 44% or more and less than 70%, the erase phase difference Th is 200 ns and the lighting rate is 70%. In this case, the erasure phase difference Th is controlled to be 300 ⁇ s.
- the time interval corresponds to the lighting rate of the discharge cells in the subfield.
- a voltage is applied to the display electrode pair so as to reduce the potential difference between the electrodes of the display electrode pair by setting the erase phase difference Th.
- the power that generates the erasing discharge The potential difference is a narrow pulse-like potential difference in which the potential difference applied between the electrodes of the display electrode pair before the last sustain discharge converges.
- the erasure phase difference Th is an erasure phase difference Th force when the discharge cell lighting rate is high.
- FIG. 8A is a diagram schematically showing the relationship between the address pulse voltage necessary for generating a normal address discharge and the erase phase difference Th.
- the horizontal axis represents the erase phase difference Th, and the vertical axis represents the erase phase difference Th.
- the address pulse voltage required to reliably generate the address discharge in the discharge cells to be discharged increases as the erase phase difference Th increases.
- FIG. 8B is a diagram schematically showing the relationship between the scan pulse voltage necessary for generating a normal address discharge and the erase phase difference Th.
- the horizontal axis represents the erase phase difference Th, and the vertical axis represents the erase phase difference Th. Shows the scan pulse voltage required to generate a normal address discharge. As shown in this figure, it has been clarified through experiments that the scan noise voltage necessary for generating a normal address discharge increases as the erase phase difference Th decreases. If the scan pulse voltage required to generate a normal address discharge is increased, the second type of write failure described above is likely to occur, and the scan pulse voltage must be increased to prevent this.
- both write failures occur with the erase phase difference Th.
- Th the erase phase difference
- Fig. 8C is a diagram schematically showing the relationship between the scan pulse voltage necessary to generate a normal address discharge and the lighting rate, where the horizontal axis indicates the lighting rate and the vertical axis indicates the normal address discharge. This shows the scan pulse voltage required to achieve this.
- the scanning noise voltage required to generate a normal address discharge increases as the lighting rate increases. Therefore, it was found that when the scan pulse voltage is constant, the occurrence of discharge tends to be delayed. This is because the discharge current increases as the lighting rate increases, and the effective voltage applied to the discharge cell decreases as the voltage drop associated therewith increases. This is necessary to generate a normal address discharge. It can be considered that the pulse voltage increases. Therefore, if the scan pulse voltage is constant, the effective voltage applied to the discharge cell will drop! /, And the occurrence of discharge will be delayed.
- FIG. 8D is a diagram schematically showing the relationship between the scan pulse voltage necessary for generating a normal address discharge, the erase phase difference Th, and the lighting rate.
- the smaller the erase phase difference Th the higher the scan pulse voltage required to generate a normal address discharge, and the higher the lighting rate, the more the normal address discharge.
- the required scan pulse voltage is higher. Therefore, the optimum erasing phase difference Th is longer in the subfield with a high lighting rate than in the subfield with a low lighting rate.
- the erasing phase difference Th is controlled to the predetermined value described above, and the erasing phase difference Th is increased as the lighting rate increases. To optimize the actual narrow pulse width. As a result, the optimum erasing phase difference Th can always be maintained regardless of the lighting rate, and optimum driving can be performed.
- FIG. 9 is a diagram showing the lower limit value of the scan pulse voltage at which the second type of write failure does not occur when the erase phase difference Th in each subfield is set to 150 ns.
- the erasing phase difference Th is shortened, the scanning pulse voltage increases.
- the degree becomes more prominent as the luminance weight of the subfield increases. This is because, in a subfield with a large luminance weight, priming due to sustain discharge increases, so that the discharge of the row is selected while the address discharge is generated in the discharge cell of the selected row in the write period. It can be considered that the wall charge of the cell is easily deprived and the rate at which the wall voltage for address discharge decreases increases.
- the rate at which the wall voltage for the address discharge decreases is small, and the scan pulse voltage can be set lower than that in the subfield having a large luminance weight. Therefore, in the subfield with a small luminance weight, even if the lighting rate increases and the scan pulse voltage to prevent the second type of writing failure increases to some extent, the luminance weight is large and the scan pulse voltage required in the subfield is high. It is not necessary to perform control according to the lighting rate as long as it does not exceed.
- the luminance weight is small!
- the erase phase difference Th is controlled so that the luminance weight is large, the erase phase difference Th in the subfield is equal to LV, or shorter, and the discharge cell lighting rate is high.
- the lighting rate is low, and it is controlled to be longer than the erase phase difference Th.
- the erase phase difference Th is changed frequently, the brightness of the display image may become unstable.
- the emission luminance associated with the erasing discharge is made constant, and fluctuations in luminance are prevented to improve image display quality. .
- the control is performed so that the erase phase difference Th is 150 ns regardless of the lighting rate in the first SF to the fourth SF, and the lighting rate is less than 44% in the fifth SF to the 10th SF.
- the erasure phase difference Th is 150 ns
- the erasure phase difference Th is 200 ns when the lighting rate power is 4% or more and less than 70%
- the erasure phase difference Th is 300 ns when the lighting rate is 70% or more.
- the present invention is not limited to this, and may be switched at an appropriate lighting rate for each subfield. It is also possible to control the erasure phase difference Th to change substantially continuously according to the lighting rate! /. By controlling in this way, the influence of the change in the erase phase difference Th on the display image also changes continuously, so that the image display quality is also improved.
- a hysteresis characteristic may be provided when the erase phase difference Th is switched. Such an embodiment will be described below.
- FIG. 10 is a diagram showing the relationship among subfields, lighting rates, and erasure phase differences Thl in Embodiment 2 of the present invention. In the first to fourth SFs, the erase phase difference Thl is controlled to be 150 ns regardless of the lighting rate.
- the erase phase difference Thl is switched depending on the lighting rate.
- the lighting rates of subfields having the same luminance weight in the immediately preceding field and the current field are compared, and the lighting rate increases and decreases.
- the lighting rate value which is the threshold for switching the erasing phase difference Thl, is changed. This gives hysteresis characteristics to the switching of the erase phase difference Thl.
- the erasing phase difference Thl is 150 nsec when the lighting rate is less than 46%, 200 nsec when the lighting rate is 46% or more and less than 72%, and 300 nsec when the lighting rate is 72% or more.
- the lighting rate is controlled to 150 nsec when the lighting rate is less than 42%, 200 nsec when the lighting rate is 42% or more and less than 68%, and 300nsec when the lighting rate is 68% or more.
- FIG. 11 is a diagram showing the relationship between the lighting rate and the erasing phase difference Thl in Embodiment 2 of the present invention, where the horizontal axis represents time and the vertical axis represents the lighting rate.
- the lighting rate is increased by comparing the lighting rates of subfields having the same luminance weight in the immediately preceding field and the current field. Then, it is judged whether or not the power is decreasing. Therefore, in FIG. 11, the relationship between the lighting rate and the erasing phase difference Thl in the fifth SF is shown as an example, and the time on the horizontal axis shows only the fifth SF in each field, and the lighting rate on the vertical axis Expressed as lighting rate in 5SF. In the sixth SF to the tenth SF, the same operation as that in the fifth SF shown in FIG. 6 is performed.
- the lighting rate as a threshold for switching the erasing phase difference Thl is 46% and 72% when the lighting rate is increasing, that is, when the waveform is rising to the right in the drawing.
- the lighting rate is decreasing, that is, when the waveform falls to the right in the screen, it becomes 42% and 68%. Therefore, the erasing phase difference Thl is the 5th SF when the lighting rate is increasing.
- the lighting rate reaches 46%, it switches from 150nsec to 200nsec, and when the lighting rate reaches 72%, it switches from 200nsec to 300nsec.
- the lighting rate when the lighting rate is decreasing, it switches from 300nsec to 200nsec when the lighting rate of the 5th SF falls below 68%, and further switches from 200nsec to 150nsec when the lighting rate falls below 42%. That is, for example, if the first time interval is 150 nsec and the second time interval is 200 nsec, the erasure phase difference Thl is 200 nsec, which is the second time interval that is longer than the 150 nsec force that is the first time interval.
- the threshold when switching to 46% is 46%, which is larger than the threshold 42% when switching from the second time interval of 200nsec to the first time interval of 150nsec.
- the threshold when switching to the first time interval of 200 nsec force which is a second time interval longer than 300 nsec.
- the value is 72%, which is larger than the threshold 68% when switching from the second time interval of 300 nsec to the first time interval of 200 nsec.
- the erasure phase difference is changed by changing the value of the illuminating rate, which is a threshold value when switching the erasing phase difference Thl, depending on whether the lighting rate is increasing or decreasing.
- the switching of Thl has a hysteresis characteristic. This prevents the erase phase difference Thl from switching frequently due to minute fluctuations in the lighting rate near the threshold.
- the operation in the sustain period is substantially the same as the operation described in Embodiment 1 with reference to FIG. 6 and FIG.
- the difference from Embodiment 1 is that the sub-fino red and the lighting rate of the sub-fino red, and the same luminance weight in the previous field and the current field.
- the control is based on whether the lighting rate of subfields with or without is increasing or decreasing. That is, in the first SF to the fourth SF, the erase phase difference Th is controlled to be 150 ns regardless of the lighting rate.
- the erasure phase difference Thl in the 5th to 10th SFs is a comparison of the lighting rates of subfields with the same luminance weight in the previous field and the current field.
- the lighting rate is reduced to 150 nsec when the lighting rate is less than 46%, 200 nsec when the lighting rate is 46% or more and less than 72%, and 300nsec when the lighting rate is 72% or more.
- the lighting rate is controlled to 150 nsec when the lighting rate is less than 42%, 200 nsec when the lighting rate is 42% or more and less than 68%, and 300 nsec when the lighting rate is 68% or more.
- the time interval corresponds to the lighting rate of the discharge cells in the subfield.
- a voltage is applied to the display electrode pair so as to reduce the potential difference between the electrodes of the display electrode pair by setting the erase phase difference Th.
- the potential difference that generates the erasing discharge is a narrow pulse-like potential difference in which the potential difference applied between the electrodes of the display electrode pair before the last sustain discharge converges.
- the erasure phase difference Th is small in luminance weight, erasure phase difference Th force in subfield is large, luminance weight is large, and erasure in subfield is
- the phase difference Th is controlled to be equal to or shorter than the Th, so that the discharge cell lighting rate is high, and the erase phase difference Th force is low, so that the discharge cell lighting rate is low and longer than the erase phase difference Th It is controlled. By controlling in this way, it is possible to generate a stable address discharge without increasing the scan pulse voltage or the data pulse voltage.
- the value of the lighting rate that serves as a threshold for switching the erasing phase difference Thl between when the lighting rate increases and when it decreases! By changing this, hysteresis characteristics are given to the switching of the erase phase difference Thl. This prevents the erasure phase difference Thl from switching frequently due to minute fluctuations in the lighting rate near the threshold.
- the luminance weight is small and the erasure phase difference Th in the subfield is equal to the luminance weight is large and the erasure phase difference Th in the subfield is LV or shorter.
- the erasing phase difference Th force when the discharge cell lighting rate is high is controlled so that the lighting cell lighting rate is low and longer than the erasing phase difference Th.
- stable address discharge can be generated without increasing the scan pulse voltage or data pulse voltage.
- the erase phase difference Th when the erase phase difference Th is changed, the light emission luminance associated with the erase discharge also changes. Therefore, if the erase phase difference Th is changed frequently, the brightness of the display image may become unstable.
- the emission luminance associated with the erasing discharge is made constant, and fluctuations in luminance are prevented to improve image display quality. .
- the threshold of switching the erasing phase difference Thl between the case where the lighting rate is increased and the case where the lighting rate is decreased to V the value of the lighting rate to be a value.
- the value of the lighting rate By changing the value, hysteresis characteristics are given to the switching of the erase phase difference Thl. This prevents the erasure phase difference Thl from frequently switching due to minute fluctuations in the lighting rate near the threshold, and realizes a higher quality display image.
- time values of the periods T1 to T10 exemplified in the present embodiment are merely examples, and the present invention is not limited to these values. It is desirable to set.
- the erase phase difference Th is controlled to be 150 ns regardless of the lighting rate in the first SF to the fourth SF, and the lighting rate is controlled in the fifth SF to the 10th SF.
- control is performed from 150 nsec to 200 nsec when the lighting rate reaches 6%, and from 200 nsec to 300 nsec when the lighting rate reaches 72%, and when the lighting rate decreases.
- the present invention is limited to this Then, for example, it may be switched at an appropriate lighting rate for each subfield.
- the erasing phase difference Th may be controlled to change substantially continuously according to the lighting rate. By controlling in this way, the influence of the change in the erase phase difference Th on the display image also changes continuously, so that the image display quality is improved.
- time values of the periods T1 to T10 illustrated in the first and second embodiments are examples, and the present invention is not limited to these values, and is set according to the discharge characteristics of the panel. It is desirable to set.
- Embodiments 1 and 2 it has been described that the all-cell initialization operation is performed in the initialization period of the first SF, and the selective initialization operation is performed in the initialization period of the second SF.
- Book The invention is not limited to this, and all cell initializing and selective initializing operations may be arbitrarily performed in each subfield.
- one field is divided into 10 subfields (first SF, second SF,..., 10th SF), and each subfield is (1, 2, 3). , 6, 11, 1
- the number of subfields and the luminance weight of each subfield are not limited to the above values.
- a stable address discharge can be generated without increasing the voltage necessary for generating the address discharge, and the panel with good image display quality can be obtained.
- a driving method can be provided.
- the panel driving method of the present invention is capable of performing an address operation with a low address pulse voltage even for a high brightness / high definition panel, and is useful as a plasma display device using the panel.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Plasma & Fusion (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/795,306 US20080165211A1 (en) | 2005-12-13 | 2006-12-12 | Method for Driving Plasma Display Panel and Plasma Display Apparatus |
Applications Claiming Priority (4)
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JP2005-358736 | 2005-12-13 | ||
JP2005358736A JP5162824B2 (ja) | 2005-12-13 | 2005-12-13 | プラズマディスプレイパネルの駆動方法 |
JP2005358735A JP4997751B2 (ja) | 2005-12-13 | 2005-12-13 | プラズマディスプレイパネルの駆動方法 |
JP2005-358735 | 2005-12-13 |
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WO2007069598A1 true WO2007069598A1 (ja) | 2007-06-21 |
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PCT/JP2006/324748 WO2007069598A1 (ja) | 2005-12-13 | 2006-12-12 | プラズマディスプレイパネルの駆動方法およびプラズマディスプレイ装置 |
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KR (2) | KR100868150B1 (ja) |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008069209A1 (ja) * | 2006-12-05 | 2008-06-12 | Panasonic Corporation | プラズマディスプレイ装置およびその駆動方法 |
WO2009013862A1 (ja) * | 2007-07-25 | 2009-01-29 | Panasonic Corporation | プラズマディスプレイ装置およびその駆動方法 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101109850B1 (ko) | 2007-09-03 | 2012-03-14 | 파나소닉 주식회사 | 플라즈마 디스플레이 패널의 구동 장치, 구동 방법 및 플라즈마 디스플레이 장치 |
EP2234092A4 (en) * | 2007-12-25 | 2011-08-17 | Panasonic Corp | DEVICE AND METHOD FOR CONTROLLING A PLASMA DISPLAY SHIELD AND PLASMA DISPLAY ARRANGEMENT |
WO2009081511A1 (ja) * | 2007-12-26 | 2009-07-02 | Panasonic Corporation | プラズマディスプレイパネルの駆動装置、駆動方法およびプラズマディスプレイ装置 |
CN109375358B (zh) * | 2018-11-28 | 2020-07-24 | 南京理工大学 | 一种基于最优照明模式设计下的差分相衬定量相位显微成像方法 |
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JP2001272946A (ja) * | 2000-03-23 | 2001-10-05 | Nec Corp | Ac型プラズマディスプレイパネルとその駆動方法 |
JP2003195802A (ja) * | 2001-12-27 | 2003-07-09 | Matsushita Electric Ind Co Ltd | プラズマディスプレイ装置の駆動方法 |
JP2003255887A (ja) * | 2002-03-07 | 2003-09-10 | Matsushita Electric Ind Co Ltd | プラズマディスプレイ装置 |
JP2004198777A (ja) * | 2002-12-19 | 2004-07-15 | Matsushita Electric Ind Co Ltd | プラズマディスプレイパネルの駆動方法 |
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JP3573968B2 (ja) * | 1997-07-15 | 2004-10-06 | 富士通株式会社 | プラズマディスプレイの駆動方法及び駆動装置 |
WO2002101706A1 (en) * | 2001-06-12 | 2002-12-19 | Matsushita Electric Industrial Co., Ltd. | Plasma display panel display and its driving method |
KR100542772B1 (ko) * | 2004-07-16 | 2006-01-20 | 엘지전자 주식회사 | 플라즈마 디스플레이 패널 구동방법 및 장치 |
KR100570971B1 (ko) * | 2004-12-01 | 2006-04-14 | 엘지전자 주식회사 | 플라즈마 디스플레이 패널의 구동방법 |
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2006
- 2006-12-12 KR KR1020077015940A patent/KR100868150B1/ko not_active Expired - Fee Related
- 2006-12-12 US US11/795,306 patent/US20080165211A1/en not_active Abandoned
- 2006-12-12 WO PCT/JP2006/324748 patent/WO2007069598A1/ja active Application Filing
- 2006-12-12 KR KR1020087021789A patent/KR101002569B1/ko not_active Expired - Fee Related
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JP2001272946A (ja) * | 2000-03-23 | 2001-10-05 | Nec Corp | Ac型プラズマディスプレイパネルとその駆動方法 |
JP2003195802A (ja) * | 2001-12-27 | 2003-07-09 | Matsushita Electric Ind Co Ltd | プラズマディスプレイ装置の駆動方法 |
JP2003255887A (ja) * | 2002-03-07 | 2003-09-10 | Matsushita Electric Ind Co Ltd | プラズマディスプレイ装置 |
JP2004198777A (ja) * | 2002-12-19 | 2004-07-15 | Matsushita Electric Ind Co Ltd | プラズマディスプレイパネルの駆動方法 |
Cited By (4)
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WO2008069209A1 (ja) * | 2006-12-05 | 2008-06-12 | Panasonic Corporation | プラズマディスプレイ装置およびその駆動方法 |
WO2009013862A1 (ja) * | 2007-07-25 | 2009-01-29 | Panasonic Corporation | プラズマディスプレイ装置およびその駆動方法 |
JP5236645B2 (ja) * | 2007-07-25 | 2013-07-17 | パナソニック株式会社 | プラズマディスプレイ装置およびその駆動方法 |
US8570248B2 (en) | 2007-07-25 | 2013-10-29 | Panasonic Corporation | Plasma display device and method of driving the same |
Also Published As
Publication number | Publication date |
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US20080165211A1 (en) | 2008-07-10 |
KR20070092275A (ko) | 2007-09-12 |
KR101002569B1 (ko) | 2010-12-17 |
KR20080086555A (ko) | 2008-09-25 |
KR100868150B1 (ko) | 2008-11-12 |
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