WO2012049839A1 - Procédé de pilotage de dispositif d'affichage à plasma et dispositif d'affichage à plasma - Google Patents

Procédé de pilotage de dispositif d'affichage à plasma et dispositif d'affichage à plasma Download PDF

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Publication number
WO2012049839A1
WO2012049839A1 PCT/JP2011/005698 JP2011005698W WO2012049839A1 WO 2012049839 A1 WO2012049839 A1 WO 2012049839A1 JP 2011005698 W JP2011005698 W JP 2011005698W WO 2012049839 A1 WO2012049839 A1 WO 2012049839A1
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Prior art keywords
subfield
sustain
electrode
discharge
voltage
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PCT/JP2011/005698
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English (en)
Japanese (ja)
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貴彦 折口
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パナソニック株式会社
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Publication of WO2012049839A1 publication Critical patent/WO2012049839A1/fr

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/2803—Display of gradations
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • G09G3/2029—Display of intermediate tones by time modulation using two or more time intervals using sub-frames the sub-frames having non-binary weights
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G09G3/293—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for address discharge
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0202—Addressing of scan or signal lines
    • G09G2310/0213—Addressing of scan or signal lines controlling the sequence of the scanning lines with respect to the patterns to be displayed, e.g. to save power
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2044—Display of intermediate tones using dithering
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2059—Display of intermediate tones using error diffusion

Definitions

  • the present invention relates to a driving method of a plasma display device using an AC surface discharge type 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 substrate and a rear substrate that are arranged to face each other.
  • a plurality of pairs of display electrodes composed of a pair of scan electrodes and sustain electrodes are formed on the front glass substrate in parallel with each other.
  • a dielectric layer and a protective layer are formed so as to cover the display electrode pairs.
  • the back substrate has a plurality of parallel data electrodes formed on the glass substrate on the back side, a dielectric layer is formed so as to cover the data electrodes, and a plurality of barrier ribs are formed thereon in parallel with the data electrodes. ing. And the fluorescent substance layer is formed in the surface of a dielectric material layer, and the side surface of a partition.
  • the front substrate and the rear substrate are arranged opposite to each other and sealed so that the display electrode pair and the data electrode are three-dimensionally crossed.
  • a discharge gas containing xenon at a partial pressure ratio of 5% is sealed, and a discharge cell is formed in a portion where the display electrode pair and the data electrode face each other.
  • ultraviolet rays are generated by gas discharge in each discharge cell, and the phosphors of each color of red (R), green (G) and blue (B) are excited and emitted by the ultraviolet rays. Display an image.
  • the subfield method is generally used as a method for driving the panel.
  • one field is divided into a plurality of subfields, and gradation display is performed by causing each discharge cell to emit light or not emit light in each subfield.
  • Each subfield has an initialization period, an address period, and a sustain period.
  • an initialization waveform is applied to each scan electrode, and an initialization operation is performed to generate an initialization discharge in each discharge cell.
  • wall charges necessary for the subsequent address operation are formed, and priming particles (excited particles for generating the discharge) for generating the address discharge stably are generated.
  • the scan pulse is sequentially applied to the scan electrodes, and the address pulse is selectively applied to the data electrodes based on the image signal to be displayed.
  • an address discharge is generated between the scan electrode and the data electrode of the discharge cell to emit light, and a wall charge is formed in the discharge cell (hereinafter, these operations are also collectively referred to as “address”). ).
  • the number of sustain pulses based on the luminance weight determined for each subfield is alternately applied to the display electrode pairs composed of the scan electrodes and the sustain electrodes.
  • a sustain discharge is generated in the discharge cell that has generated the address discharge, and the phosphor layer of the discharge cell emits light (hereinafter referred to as “lighting” that the discharge cell emits light by the sustain discharge, and “non-emitting”). Also written as “lit”.)
  • each discharge cell is made to emit light with the luminance according to the luminance weight.
  • each discharge cell of the panel is caused to emit light with a luminance corresponding to the gradation value of the image signal, and an image is displayed in the image display area of the panel.
  • crosstalk a phenomenon may occur in which charges move from one discharge cell to the other between adjacent discharge cells.
  • crosstalk a phenomenon in which charges move from one discharge cell to the other between adjacent discharge cells.
  • crosstalk occurs, the wall charge in the discharge cell decreases. If a discharge cell in which the address operation becomes unstable due to a decrease in wall charges caused by crosstalk occurs, the image display quality may be deteriorated.
  • Patent Document 1 In order to prevent deterioration of image display quality in a plasma display device, a technique for preventing crosstalk is disclosed (for example, refer to Patent Document 1).
  • a technique for preventing crosstalk is disclosed (for example, refer to Patent Document 1).
  • the specific gradation value is a gradation value having a light emission pattern in which light emission and non-light emission of the subfield are not interchanged in continuous subfields between continuous gradation values.
  • the present invention comprises a plurality of display combination sets in which one field is composed of a plurality of subfields with luminance weights determined in advance, and a plurality of combinations of light emitting subfields and non-light emitting subfields are selected.
  • This is a driving method of a plasma display device that displays gradation by controlling light emission / non-light emission of discharge cells using combinations belonging to the display combination set.
  • a plurality of subfields constituting one field include a first subfield having the smallest luminance weight, a second subfield arranged immediately after the first subfield, and a second subfield. And a third subfield arranged immediately after the field.
  • the second subfield also emits light when the third subfield emits light.
  • the gradation is displayed using the combination set for display constituted by the combination.
  • the effect of suppressing the crosstalk can be enhanced, and when the crosstalk occurs, the influence of the crosstalk on the image displayed on the panel can be suppressed, and a high quality image can be displayed on the panel.
  • the second subfield and the third subfield may have the same luminance weight.
  • the discharge cell of a specific color Only in step 2 may be displayed using the second display combination set.
  • the present invention also provides a plasma display panel having a plurality of discharge cells each having a display electrode pair consisting of a scan electrode and a sustain electrode and a data electrode, an address period, and a number of sustain pulses corresponding to the luminance weight.
  • a combination set for display comprising a plurality of subfields each having a sustain period applied to the plasma display panel to drive the plasma display panel and selecting a plurality of combinations of light-emitting subfields and non-light-emitting subfields.
  • a driving circuit that displays gradation by controlling light emission / non-light emission of the discharge cells using combinations belonging to the display combination set.
  • the driving circuit includes a first subfield having the smallest luminance weight in a plurality of subfields constituting one field, a second subfield arranged immediately after the first subfield,
  • the plasma display panel is driven including a third subfield disposed immediately after the second subfield.
  • the drive circuit then applies the second sub-field when the third sub-field emits light when one sustain pulse is applied to each of the scan electrode and the sustain electrode during the sustain period of the first sub-field.
  • the gradation is displayed using a display combination set composed of combinations in which the field also emits light.
  • the effect of suppressing the crosstalk can be enhanced, and when the crosstalk occurs, the influence of the crosstalk on the image displayed on the panel can be suppressed, and a high quality image can be displayed on the panel.
  • FIG. 1 is an exploded perspective view showing a structure of a panel used in the plasma display device in accordance with the first exemplary embodiment of the present invention.
  • FIG. 2 is an electrode array diagram of the panel used in the plasma display device in accordance with the first exemplary embodiment of the present invention.
  • FIG. 3 is a diagram schematically showing drive voltage waveforms applied to the respective electrodes of the panel used in the plasma display device in accordance with the first exemplary embodiment of the present invention.
  • FIG. 4A is a diagram showing an example of a first coding table used in the plasma display device according to Embodiment 1 of the present invention.
  • FIG. 4B is a diagram showing an example of a second coding table used in the plasma display device according to Embodiment 1 of the present invention.
  • FIG. 1 is an exploded perspective view showing a structure of a panel used in the plasma display device in accordance with the first exemplary embodiment of the present invention.
  • FIG. 2 is an electrode array diagram of the panel used in the plasma display device in accordance with
  • FIG. 5 is a diagram schematically showing an example of a circuit block constituting the plasma display device in accordance with the first exemplary embodiment of the present invention.
  • FIG. 6 is a diagram schematically showing a configuration example of an image signal processing circuit used in the plasma display device in accordance with the first exemplary embodiment of the present invention.
  • FIG. 7 is a diagram showing the minimum value of the write pulse voltage Vd necessary for the write operation in each subfield.
  • FIG. 8 is a diagram showing an example of a third coding table used in the plasma display device in the second exemplary embodiment of the present invention.
  • FIG. 9 is a diagram schematically showing a configuration example of an image signal processing circuit used in the plasma display device according to the second embodiment of the present invention.
  • FIG. 10 is a diagram showing an example of a fourth coding table used in the plasma display device in the second exemplary embodiment of the present invention.
  • FIG. 1 is an exploded perspective view showing the structure of panel 10 used in the plasma display device in accordance with the first exemplary embodiment of the present invention.
  • a plurality of display electrode pairs 24 each including a scanning electrode 22 and a sustaining electrode 23 are formed on a glass front substrate 21.
  • a dielectric layer 25 is formed so as to cover the scan electrode 22 and the sustain electrode 23, and a protective layer 26 is formed on the dielectric layer 25.
  • This protective layer 26 has been used as a panel material in order to lower the discharge starting voltage in the discharge cell.
  • the secondary layer 26 has a large secondary electron emission coefficient and is durable. It is made of a material mainly composed of magnesium oxide (MgO).
  • a plurality of data electrodes 32 are formed on the rear substrate 31, a dielectric layer 33 is formed so as to cover the data electrodes 32, and a grid-like partition wall 34 is formed thereon.
  • a phosphor layer 35R that emits red (R)
  • a phosphor layer 35G that emits green (G)
  • a phosphor layer 35B that emits blue (B).
  • the phosphor layer 35R, the phosphor layer 35G, and the phosphor layer 35B are collectively referred to as a phosphor layer 35.
  • the front substrate 21 and the rear substrate 31 are arranged to face each other so that the display electrode pair 24 and the data electrode 32 intersect with each other with a minute discharge space interposed therebetween. And the outer peripheral part is sealed with sealing materials, such as glass frit. Then, for example, a mixed gas of neon and xenon is sealed in the discharge space inside as a discharge gas.
  • the discharge space is partitioned into a plurality of sections by partition walls 34, and discharge cells are formed at the intersections between the display electrode pairs 24 and the data electrodes 32.
  • discharge is generated in these discharge cells, and the phosphor layer 35 of the discharge cells emits light (lights the discharge cells), thereby displaying a color image on the panel 10.
  • one pixel is constituted by three consecutive discharge cells arranged in the direction in which the display electrode pair 24 extends.
  • the three discharge cells are a discharge cell having a phosphor layer 35R and emitting red (R) (red discharge cell), and a discharge cell having a phosphor layer 35G and emitting green (G) (green). And a discharge cell having a phosphor layer 35B and emitting blue (B) light (blue discharge cell).
  • the structure of the panel 10 is not limited to the above-described structure, and may be, for example, provided with a stripe-shaped partition wall.
  • FIG. 2 is an electrode array diagram of panel 10 used in the plasma display device in accordance with the first exemplary embodiment of the present invention.
  • the panel 10 includes n scan electrodes SC1 to SCn (scan electrode 22 in FIG. 1) extended in the horizontal direction (row direction) and n sustain electrodes SU1 to SUn (sustain electrodes in FIG. 1). 23) are arranged, and m data electrodes D1 to Dm (data electrodes 32 in FIG. 1) extending in the vertical direction (column direction) are arranged.
  • a green phosphor is applied as a phosphor layer 35G to a discharge cell having a blue color
  • a blue phosphor is applied as a phosphor layer 35B to a discharge cell having a data electrode Dp + 2.
  • the plasma display device in the present embodiment drives the panel 10 by the subfield method.
  • the subfield method one field is divided into a plurality of subfields on the time axis, and a luminance weight is set for each subfield. Therefore, each field has a plurality of subfields.
  • Each subfield has an initialization period, an address period, and a sustain period.
  • one field is composed of six subfields (subfield SF1, subfield SF2, subfield SF3, subfield SF4, subfield SF5, subfield SF6), and subfield SF1 to subfield
  • subfield SF1 subfield SF1 to subfield
  • each subfield of SF6 has a luminance weight of (1, 2, 4, 8, 16, 32) will be described.
  • the subfield SF1 having the smallest luminance weight “1” is the first subfield
  • the subfield SF2 arranged immediately after the subfield SF2 is the second subfield
  • a subfield SF3 arranged immediately after the subfield SF2 is a third subfield.
  • the number of subfields constituting one field, the luminance weight of each subfield, and the like are not limited to the above numerical values.
  • one field is composed of 10 subfields (subfield SF1,..., Subfield SF10), and each subfield from subfield SF1 to subfield SF10 is (1, 2, 3, 6, 11, It is desirable to appropriately set the configuration of the subfield according to the specifications of the plasma display device, such as having luminance weights of 18, 30, 44, 60, 81).
  • an initializing operation is performed in which initializing discharge is generated in the discharge cells and wall charges necessary for the address discharge in the subsequent address period are formed on each electrode.
  • a scan pulse is applied to the scan electrode 22 and an address pulse is selectively applied to the data electrode 32 to selectively generate an address discharge in the discharge cells to emit light. Then, an address operation is performed to form wall charges in the discharge cells for generating a sustain discharge in the subsequent sustain period.
  • the sustain pulses of the number obtained by multiplying the luminance weight set in each subfield by a predetermined proportional constant are alternately applied to the scan electrode 22 and the sustain electrode 23, and the address discharge was generated in the immediately preceding address period.
  • a sustain discharge is generated in the discharge cell, and a sustain operation for emitting light from the discharge cell is performed.
  • This proportionality constant is a luminance multiple.
  • the luminance weight represents a ratio of the luminance magnitudes displayed in each subfield, and the number of sustain pulses corresponding to the luminance weight is generated in the sustain period in each subfield. Therefore, for example, the subfield with the luminance weight “8” emits light with a luminance about eight times that of the subfield with the luminance weight “1”, and emits light with about four times the luminance of the subfield with the luminance weight “2”.
  • the sustain pulse is applied to the scan electrode 22 and the sustain electrode 23 four times in the sustain period of the subfield having the luminance weight “2”. Therefore, the number of sustain pulses generated in the sustain period is 8.
  • each subfield is selectively emitted to display various gradation values and display the image on the panel 10. Can be displayed.
  • the initialization operation includes all-cell initialization operation that generates an initializing discharge in the discharge cells regardless of the operation of the immediately preceding subfield, and the address discharge is generated in the immediately preceding subfield address period and is maintained in the sustain period.
  • an ascending rising waveform voltage and a descending falling waveform voltage are applied to the scan electrode 22 to generate an initializing discharge in all the discharge cells in the image display region. Then, among all the subfields, the all-cell initialization operation is performed in the initialization period of one subfield, and the selective initialization operation is performed in the initialization period of the other subfield.
  • the initialization period for performing the all-cell initialization operation is referred to as “all-cell initialization period”, and the subfield having the all-cell initialization period is referred to as “all-cell initialization subfield”.
  • An initialization period for performing the selective initialization operation is referred to as “selective initialization period”, and a subfield having the selective initialization period is referred to as “selective initialization subfield”.
  • the first subfield (subfield SF1) of each field is an all-cell initializing subfield, and the other subfields are selective initializing subfields.
  • the initializing discharge is generated in all the discharge cells at least once in one field, the addressing operation after the initializing operation for all the cells can be stabilized. Further, light emission not related to image display is only light emission due to discharge in the all-cell initializing operation in the subfield SF1. Therefore, the black luminance that is the luminance of the black display region where no sustain discharge occurs is only weak light emission in the all-cell initialization operation, and an image with high contrast can be displayed on the panel 10.
  • the number of subfields constituting one field and the luminance weight of each subfield are not limited to the above-described numerical values.
  • the structure which switches a subfield structure based on an image signal etc. may be sufficient.
  • FIG. 3 schematically shows drive voltage waveforms applied to each electrode of panel 10 used in the plasma display device in accordance with the first exemplary embodiment of the present invention.
  • FIG. 3 shows scan electrode SC1 that performs the address operation first in the address period, scan electrode SCn that performs the address operation last in the address period (for example, scan electrode SC1080), sustain electrode SU1 to sustain electrode SUn, and data electrode D1.
  • FIG. 4 shows driving voltage waveforms applied to each of the data electrodes Dm.
  • Scan electrode SCi, sustain electrode SUi, and data electrode Dk in the following represent electrodes selected based on image data (data indicating light emission / non-light emission for each subfield) from among the electrodes.
  • FIG. 3 shows driving voltage waveforms in three subfields, that is, subfield SF1, subfield SF2, and subfield SF3.
  • the subfield SF1 is a subfield for performing an all-cell initialization operation
  • the subfield SF2 and the subfield SF3 are subfields for performing a selective initialization operation. Therefore, the waveform shape of the drive voltage applied to the scan electrode 22 in the initialization period differs between the subfield SF1, the subfield SF2, and the subfield SF3.
  • the drive voltage waveforms in the other subfields are substantially the same as the drive voltage waveforms in subfield SF2 and subfield SF3, except that the number of sustain pulses generated in the sustain period is different.
  • the number of subfields constituting one field and the luminance weight of each subfield are not limited to the above values.
  • subfield SF1 which is an all-cell initialization subfield
  • the voltage 0 (V) is applied to the data electrode D1 to the data electrode Dm and the sustain electrode SU1 to the sustain electrode SUn.
  • Voltage Vi1 is applied to scan electrode SC1 through scan electrode SCn after voltage 0 (V) is applied, and an upward ramp waveform voltage (ramp voltage) that gradually rises from voltage Vi1 to voltage Vi2 is applied.
  • Voltage Vi1 is set to a voltage lower than the discharge start voltage with respect to sustain electrode SU1 through sustain electrode SUn, and voltage Vi2 is set to a voltage exceeding the discharge start voltage.
  • While this ramp voltage is applied to scan electrode SC1 through scan electrode SCn, data between scan electrode SC1 through scan electrode SCn and sustain electrode SU1 through sustain electrode SUn, and scan electrode SC1 through scan electrode SCn and data of each discharge cell.
  • a weak initializing discharge is generated between the electrode D1 and the data electrode Dm. Then, the negative wall voltage on scan electrode SC1 through scan electrode SCn and the positive wall voltage on sustain electrode SU1 through sustain electrode SUn are weakened, and the positive wall voltage on data electrode D1 through data electrode Dm is used for the write operation. It is adjusted to a suitable value.
  • voltage Ve2 is applied to sustain electrode SU1 through sustain electrode SUn
  • voltage 0 (V) is applied to data electrode D1 through data electrode Dm
  • scan electrode SC1 through scan electrode SCn are applied. Applies a voltage Vc.
  • a negative scan pulse having a negative voltage Va is applied to the scan electrode SC1 in the first row where the address operation is performed first.
  • this voltage Va is also referred to as “scanning pulse voltage”.
  • a positive address pulse of a positive voltage Vd is applied to the data electrode Dk of the discharge cell that should emit light in the first row of the data electrodes D1 to Dm.
  • this voltage Vd is also referred to as “write pulse voltage”.
  • sustain electrode SU1 in the region intersecting data electrode Dk is induced by the discharge generated between data electrode Dk and scan electrode SC1. Discharge also occurs between scan electrode SC1 and scan electrode SC1.
  • an address discharge is generated in the discharge cell (discharge cell to emit light) to which the scan pulse voltage Va and the address pulse voltage Vd are simultaneously applied, a positive wall voltage is accumulated on the scan electrode SC1, and the sustain electrode SU1 is accumulated. And a negative wall voltage is also accumulated on the data electrode Dk.
  • the scan pulse voltage Va is applied to the scan electrode SC2 in the second row
  • the address pulse voltage Vd is applied to the data electrode Dk corresponding to the discharge cell to emit light in the second row, and the discharge cell in the second row.
  • the write operation is performed.
  • a similar address operation is sequentially performed in the order of scan electrode SC3, scan electrode SC4,..., Scan electrode SCn until reaching the discharge cell in the n-th row, and the address period of subfield SF1 is completed.
  • FIG. 3 shows a configuration in which the voltage Ve1 is applied to the sustain electrodes SU1 to SUn in the latter half of the initialization period and the voltage Ve2 is applied in the address period, but the voltage Ve1 and the voltage Ve2 May be equal to each other.
  • the voltage difference between the scan electrode SCi and the sustain electrode SUi exceeds the discharge start voltage, and the sustain discharge is generated. And the fluorescent substance layer 35 light-emits with the ultraviolet-ray which generate
  • V voltage 0 (V) is applied to scan electrode SC1 through scan electrode SCn
  • sustain pulse voltage Vs is applied to sustain electrode SU1 through sustain electrode SUn.
  • a sustain discharge occurs again, a negative wall voltage is accumulated on sustain electrode SUi, and a positive wall voltage is accumulated on scan electrode SCi.
  • sustain pulses of the number obtained by multiplying the luminance weight by a predetermined luminance multiple are alternately applied to scan electrode SC1 through scan electrode SCn and sustain electrode SU1 through sustain electrode SUn.
  • the discharge cells that have generated the address discharge in the address period emit light with a luminance corresponding to the luminance weight.
  • voltage 0 (V) is applied to scan electrode SC1 through scan electrode SCn while voltage 0 (V) is applied to sustain electrode SU1 through sustain electrode SUn and data electrode D1 through data electrode Dm.
  • a ramp waveform voltage (ramp voltage) that gradually rises from V to voltage Vr is applied.
  • subfield SF2 which is a selective initialization subfield
  • voltage Ve1 is applied to sustain electrode SU1 through sustain electrode SUn, and voltage 0 (V) is applied to data electrode D1 through data electrode Dm.
  • a scan waveform SC1 to scan electrode SCn is applied with a ramp waveform voltage (ramp voltage) that gently falls from a voltage lower than the discharge start voltage (eg, voltage 0 (V)) toward negative voltage Vi4.
  • Voltage Vi4 is set to a voltage exceeding the discharge start voltage with respect to sustain electrode SU1 through sustain electrode SUn.
  • a weak initializing discharge is generated in a discharge cell that has generated a sustain discharge in the sustain period of the immediately preceding subfield (subfield SF1 in FIG. 3). To do.
  • the initializing discharge weakens the wall voltage on scan electrode SCi and sustain electrode SUi. Further, an excessive portion of the wall voltage accumulated on the data electrode Dk is discharged, and the wall voltage on the data electrode Dk is adjusted to a wall voltage suitable for the write operation.
  • the initializing operation in the subfield SF2 is a selective initializing operation in which the initializing discharge is selectively generated in the discharge cells that have performed the addressing operation in the address period of the immediately preceding subfield.
  • a drive voltage waveform similar to that in the address period of the subfield SF1 is applied to each electrode, and an address operation for accumulating wall voltage on each electrode of the discharge cell to emit light is performed.
  • the number of sustain pulses corresponding to the luminance weight is alternately applied to scan electrode SC1 through scan electrode SCn and sustain electrode SU1 through sustain electrode SUn.
  • a sustain discharge is generated in the discharge cell that has generated the address discharge.
  • each subfield after subfield SF3 In the initialization period and address period of each subfield after subfield SF3, the same drive voltage waveform as that in the initialization period and address period of subfield SF2 is applied to each electrode. In the sustain period of each subfield after subfield SF3, the drive voltage waveform similar to that of subfield SF2 is applied to each electrode except for the number of sustain pulses generated in the sustain period.
  • one field is composed of a plurality of subfields in which luminance weights are set in advance. Then, by selectively emitting light in the subfield according to the magnitude of the gradation value displayed on the discharge cell, each discharge cell is caused to emit light with brightness according to the gradation value, and an image is displayed on the panel 10. .
  • the subfield to emit light is also referred to as “lighting subfield”
  • the non-lighting subfield is also referred to as “nonlighting subfield”.
  • coding a combination of a lighting subfield and a non-lighting subfield in one field.
  • coding a plurality of codings (display codings) used for displaying gradations are selected from the plurality of codings, and a display combination set is created.
  • the display combination set is referred to as a “coding table”.
  • the magnitude of the luminance multiple is represented by “N”.
  • the number of sustain pulses generated in the sustain period changes according to the magnitude of the luminance multiple “N”. Therefore, the brightness of the image displayed on the panel 10 can be controlled by controlling the magnitude of the luminance multiple “N”.
  • the average luminance (APL: Average Picture Level) of the image signal is detected, and the magnitude of the luminance multiple “N” is controlled according to the APL. Thereby, the brightness of the image displayed on the panel 10 can be adjusted according to APL.
  • APL Average Picture Level
  • the brightness when displaying black (the brightness when no sustain discharge occurs) is “0”.
  • the magnitude of the luminance weight is represented by “M”.
  • the luminance multiple is “N”
  • the luminance corresponding to the luminance weight “M” is expressed as “N ⁇ M”.
  • the luminance of the discharge cell in which only the subfield SF1 having the luminance weight “1” emits light is “N”.
  • the luminance magnification “N” is not limited to an integer.
  • the luminance magnification “N” is selected according to the APL from among a plurality of numerical values including, for example, 1, 1.5, 2, 2.5, 3, and decimal numbers.
  • FIG. 4A is a diagram showing an example of a first coding table used in the plasma display device according to Embodiment 1 of the present invention.
  • FIG. 4B is a diagram showing an example of a second coding table used in the plasma display device according to Embodiment 1 of the present invention.
  • the first coding table is a “first display combination set”, and the second coding table is a “second display combination set”.
  • the plasma display device drives panel 10 by forming one field by six subfields from subfield SF1 to subfield SF6.
  • five subfields from subfield SF1 to subfield SF5 are shown in the coding tables of FIGS. 4A and 4B.
  • each subfield In the coding table shown in FIGS. 4A and 4B, the numerical value written immediately below the column indicating each subfield represents the luminance weight of each subfield.
  • the subfields SF1 to SF5 have luminance weights of “1”, “2”, “4”, “8”, and “16”, respectively.
  • the light-emitting subfield is “1”
  • the non-light-emitting subfield is blank
  • the leftmost column indicates the gradation value to be displayed in each coding.
  • the subfield SF1 and the subfield SF2 emit light in the discharge cell displaying the gradation value “3”.
  • the subfield SF1, the subfield SF2, the subfield SF3, and the subfield SF5 emit light.
  • the first coding table shown in FIG. 4A is a set of codings having a rule that “a discharge cell displaying gradation value“ 1 ”or higher always emits subfield SF1”.
  • This rule can be rephrased as “a discharge cell that does not emit light in the subfield SF1 does not emit light after the subfield SF2”.
  • this rule can be paraphrased as “subfield SF1 always emits light in a discharge cell in which subfield SF2 emits light”.
  • the subfield SF1 always emits light in the discharge cell displaying the gradation value “1” or more. According to this rule, as shown in FIG. 4A, 16 gradation values can be displayed in five subfields from subfield SF1 to subfield SF5.
  • the sub-field SF1 is always emitted in the discharge cells displaying the gradation value “1” or more, and the sub-field SF2 is always displayed in the discharge cells displaying the gradation value “3” or more.
  • This rule can be rephrased as “a discharge cell that does not emit light in the subfield SF1 does not emit light after the subfield SF2, and a discharge cell that does not emit light in the subfield SF2 does not emit light after the subfield SF3”.
  • this rule can be paraphrased as “subfield SF1 and subfield SF2 always emit light in a discharge cell in which subfield SF3 emits light”.
  • the subfield SF1 and the subfield SF2 always emit light in the discharge cells displaying the gradation value “3” or more. According to this rule, as shown in FIG. 4B, nine gradation values can be displayed in five subfields from subfield SF1 to subfield SF5.
  • FIG. 5 is a diagram schematically showing an example of a circuit block constituting the plasma display device 40 according to Embodiment 1 of the present invention.
  • the plasma display device 40 shown in the present embodiment includes a panel 10 and a drive circuit that drives the panel 10.
  • the drive circuit includes an image signal processing circuit 41, a data electrode drive circuit 42, a scan electrode drive circuit 43, a sustain electrode drive circuit 44, a timing generation circuit 45, and a power supply circuit (not shown) that supplies necessary power to each circuit block. It has.
  • the image signal processing circuit 41 receives a red image signal, a green image signal, and a blue image signal. Then, the image signal processing circuit 41 assigns a gradation value to each discharge cell based on the input image signal, and the gradation value is used as image data indicating light emission / non-light emission for each subfield (light emission / non-light emission). Is converted to data corresponding to digital signals “1” and “0”). At this time, the image signal processing circuit 41 generates image data based on the first coding table or the second coding table described above.
  • the image signal processing circuit 41 uses the red image data, the green image signal, the blue image signal based on the first coding table or the second coding table based on the first coding table or the second coding table. Converted to image data and output. For example, the image signal processing circuit 41 outputs the image data “110000” when displaying the gradation value “3”, and outputs the image data “11110” when displaying the gradation value “23”. .
  • the image data is arranged in the order of subfield SF1, subfield SF2, subfield SF3, subfield SF4, subfield SF5, and subfield SF6.
  • the timing generation circuit 45 generates various timing signals for controlling the operation of each circuit block based on the horizontal synchronization signal and the vertical synchronization signal.
  • the generated timing signal is supplied to each circuit block (data electrode drive circuit 42, scan electrode drive circuit 43, sustain electrode drive circuit 44, image signal processing circuit 41, etc.).
  • the data electrode drive circuit 42 generates address pulses corresponding to the data electrodes D1 to Dm based on the image data of each color output from the image signal processing circuit 41 and the timing signal supplied from the timing generation circuit 45. . Then, the data electrode driving circuit 42 applies the address pulse to the data electrodes D1 to Dm during the address period.
  • Scan electrode drive circuit 43 includes an initialization waveform generation circuit, a sustain pulse generation circuit, and a scan pulse generation circuit (not shown in FIG. 5), and generates a drive voltage waveform based on a timing signal supplied from timing generation circuit 45. It is prepared and applied to each of scan electrode SC1 to scan electrode SCn.
  • the initialization waveform generation circuit generates an initialization waveform to be applied to scan electrode SC1 through scan electrode SCn during the initialization period based on the timing signal.
  • the sustain pulse generating circuit generates a sustain pulse to be applied to scan electrode SC1 through scan electrode SCn during the sustain period based on the timing signal.
  • the scan pulse generating circuit includes a plurality of scan electrode driving ICs (scan ICs), and generates scan pulses to be applied to scan electrode SC1 through scan electrode SCn during the address period based on the timing signal.
  • Sustain electrode drive circuit 44 includes a sustain pulse generation circuit and a circuit (not shown in FIG. 5) for generating voltage Ve1 and voltage Ve2, and generates a drive voltage waveform based on a timing signal supplied from timing generation circuit 45. It is prepared and applied to each of sustain electrode SU1 through sustain electrode SUn. In the sustain period, a sustain pulse is generated based on the timing signal and applied to sustain electrode SU1 through sustain electrode SUn.
  • FIG. 6 is a diagram schematically showing a configuration example of the image signal processing circuit 41 used in the plasma display device 40 according to the first embodiment of the present invention.
  • FIG. 6 shows only circuit blocks related to each operation shown in the present embodiment, and other circuit blocks are omitted.
  • the image signal processing circuit 41 includes a gradation value conversion unit 51R corresponding to a red image signal, a gradation value conversion unit 51G corresponding to a green image signal, and a gradation value conversion unit 51B corresponding to a blue image signal. And a storage device storing the first coding table corresponding to the red image signal (hereinafter referred to as “first coding table 52R”, and in FIG. 6 simply referred to as “first table” and denoted by reference numeral “52R”. ”), The storage device storing the first coding table corresponding to the green image signal (hereinafter referred to as“ first coding table 52G ”), and in FIG.
  • first coding table 52B a storage device that stores a first coding table corresponding to the blue image signal
  • second coding table 53R a storage device that stores the second coding table corresponding to the red image signal.
  • second coding a storage device that is simply referred to as “second table” and given a reference numeral “53R”
  • second table 53G a storage device that stores the green image signal.
  • a storage device hereinafter referred to simply as” second table “and given the code” 53G " and a second coding table corresponding to the blue image signal (hereinafter referred to as” table 53G ").
  • the data conversion unit 54 corresponding to the red image signal is indicated as “second coding table 53B”.
  • Each storage device that stores the coding table can arbitrarily read the coding data stored therein according to the gradation value.
  • a red image signal (shown as “image signal (R)” in FIG. 6) is input to the gradation value conversion unit 51R.
  • the tone value conversion unit 51R displays a signal corresponding to the red image signal on the panel 10 and necessary signal processing, for example, a signal such as pixel number conversion or gamma correction according to the number of pixels of the panel 10. Processing is applied to the red image signal. Then, the red image signal subjected to the signal processing is converted into a red gradation value.
  • a green image signal (indicated as “image signal (G)” in FIG. 6) is input to the gradation value conversion unit 51G. Then, the tone value conversion unit 51G displays a signal corresponding to the green image signal on the panel 10 and necessary signal processing, for example, a signal such as pixel number conversion or gamma correction according to the number of pixels of the panel 10 Processing is applied to the green image signal. Then, the green image signal subjected to the signal processing is converted into a green gradation value.
  • a blue image signal (indicated as “image signal (B)” in FIG. 6) is input to the gradation value conversion unit 51B. Then, the tone value conversion unit 51B displays a signal corresponding to the blue image signal on the panel 10 and necessary signal processing, for example, a signal such as pixel number conversion or gamma correction according to the number of pixels of the panel 10 Processing is performed on the blue image signal. Then, the blue image signal subjected to the signal processing is converted into a blue gradation value.
  • the tone value conversion unit 51R, the tone value conversion unit 51G, and the tone value conversion unit 51B have a red tone value, a green tone value, and a blue tone value that constitute one pixel at the same time. They are operating in synchronism with each other so that they are output.
  • the selector 55R selects the first coding table 52R when the sustain pulse is applied to each of the scan electrode 22 and the sustain electrode 23 in the subfield SF1 and scans in the subfield SF1.
  • the second coding table 53R is selected.
  • the selector 55G selects the first coding table 52G when the sustain pulse is applied to each of the scan electrode 22 and the sustain electrode 23 in the subfield SF1, and the subfield SF1 is selected.
  • the second coding table 53G is selected.
  • the selector 55B selects the first coding table 52B and applies the subfield SF1 when two or more sustain pulses are applied to each of the scan electrode 22 and the sustain electrode 23 in the subfield SF1.
  • the sustain pulse is applied once to each of the scan electrode 22 and the sustain electrode 23, the second coding table 53B is selected.
  • the data converter 54R reads the coding data from the coding table selected by the selector 55R based on the red gradation value output from the gradation value converter 51R. For example, if the first coding table 52R is selected in the selector 55R, the coding data is read from the first coding table 52R based on the red gradation value output from the gradation value conversion unit 51R. If the second coding table 53R is selected in the selector 55R, the coding data is read from the second coding table 53R based on the red gradation value output from the gradation value conversion unit 51R. The read data is output as red image data.
  • the data conversion unit 54G reads coding data from the coding table selected by the selector 55G based on the green gradation value output from the gradation value conversion unit 51G, and converts the read data to green Output as image data.
  • the data converter 54B reads coding data from the coding table selected by the selector 55B based on the blue tone value output from the tone value converter 51B, and reads the read data into blue Output as image data.
  • FIG. 7 is a diagram showing the minimum value of the write pulse voltage Vd necessary for the write operation in each subfield.
  • the vertical axis represents the minimum value of the write pulse voltage Vd required for stable write operation, and the horizontal axis represents the subfield.
  • FIG. 7 shows the minimum value of the address pulse voltage Vd required for the address operation for each subfield in each of the red discharge cell, the green discharge cell, and the blue discharge cell.
  • the crosstalk can be quantified by measuring the minimum voltage value of the write pulse voltage Vd necessary for the write operation.
  • the graph shown in FIG. 7 summarizes the results measured as follows. First, of the three discharge cells constituting one pixel, one discharge cell (target discharge cell) of interest in a specific subfield is not caused to emit light, and the other two discharge cells are caused to emit light. Next, the minimum value of the address pulse voltage necessary for addressing the discharge cell of interest in the next subfield is measured.
  • FIG. 7 shows the measurement results after subfield SF2. Further, the graph shown in FIG. 7 shows the crosstalk characteristics in the red, green, and blue discharge cells of the panel 10.
  • the characteristic indicated by the triangular symbol in FIG. 7 is the measurement result when the sustain pulse is applied twice or more to each electrode of the scan electrode 22 and the sustain electrode 23 in the sustain period of the subfield SF1 in the red discharge cell. It represents.
  • the characteristics indicated by the square symbols in FIG. 7 are the measurement results when the sustain pulse is applied twice or more to each electrode of the scan electrode 22 and the sustain electrode 23 in the sustain period of the subfield SF1 in the green discharge cell. It represents.
  • the characteristic indicated by the symbol of the ellipse in FIG. 7 is the measurement result when the sustain pulse is applied twice or more to each electrode of the scan electrode 22 and the sustain electrode 23 in the sustain period of the subfield SF1 in the blue discharge cell. It represents.
  • the characteristic indicated by the circle symbol in FIG. 7 is the measurement result when the sustain pulse is applied once to each of the scan electrode 22 and the sustain electrode 23 in the sustain period of the subfield SF1 in the green discharge cell. It represents.
  • the sustain pulse is applied to the scan electrode 22 and the sustain electrode 23 twice or more in the sustain period of the subfield SF1, the subfield SF2 and the subfield of the blue discharge cell are applied.
  • the minimum value of the address pulse voltage Vd in SF3 is higher than that of the red discharge cell and the green discharge cell. This is considered to be because the wall charge in the blue discharge cell is reduced as compared with the other discharge cells. That is, it is considered that the amount of generated crosstalk in the blue discharge cell is larger than that in other discharge cells.
  • the minimum value of the address pulse voltage Vd in the subfield SF2 of the green discharge cell is It is high compared with the discharge cell. This is because, in a green discharge cell, when a sustain pulse is applied to each of the scan electrode 22 and the sustain electrode 23 once in the sustain period of the subfield SF1, a sustain discharge does not occur in the subfield SF2. This shows that the address operation in the green discharge cells tends to become unstable in the subfields after the subfield SF3, and the sustain discharge may not occur.
  • the address operation is stably performed in the subfields after subfield SF3.
  • the subfield SF2 only needs to emit light.
  • the coding table set based on this rule is the second coding table shown in FIG. 4B.
  • the second coding table shown in FIG. 4B is obtained by removing the coding in which the subfield SF3 and the subsequent light are emitted after the subfield SF2 is not emitted from the first coding table shown in FIG. 4A.
  • subfield SF3 when the subsequent subfields emit light, the subfield SF1 and the subfield SF2 also emit light. Thereby, crosstalk between the discharge cells can be suppressed, and a high-quality image can be displayed on the panel 10.
  • Embodiment 2 In the second coding table shown in FIG. 4B in Embodiment 1, the gradation value next to the gradation value “3” is “7”.
  • the gradation values between these gradation values for example, the gradation value “4”, the gradation value “5”, and the gradation value “6” are simulated using the dithering process or the error diffusion process as described above. Can be displayed.
  • the third coding table is used when the number of sustain pulses applied to each electrode of scan electrode 22 and sustain electrode 23 is one each in the sustain period of subfield SF1.
  • FIG. 8 is a diagram showing an example of a third coding table used in the plasma display device according to the second embodiment of the present invention.
  • panel 10 is driven by forming one field by six subfields from subfield SF1 to subfield SF6.
  • the coding table in FIG. In order to simplify the above, five subfields from subfield SF1 to subfield SF5 are shown.
  • the third coding table is configured based on the same rules as the second coding table. That is, the third coding table has a rule that “in the discharge cell in which the subfield SF3 emits light, the subfield SF1 and the subfield SF2 always emit light”. Therefore, the combination of the lighting subfield and the non-lighting subfield is equal to each other in the second coding table and the third coding table.
  • the third coding table can be referred to as “second combination set for display”.
  • the third coding table differs from the second coding table in that the luminance weights of the subfield SF2 and the subfield SF3 are both “2”.
  • the gradation value next to the gradation value “3” is “5” in the third coding table, and the difference between the gradation values can be reduced as compared with the second coding table. For this reason, it is possible to suppress variation in luminance when performing dither processing or error diffusion processing.
  • the number of sustain pulses applied to each electrode of scan electrode 22 and sustain electrode 23 in the sustain period of subfield SF1 is one, and subfield SF2
  • the green discharge cell does not emit light and the discharge cell adjacent to the green discharge cell emits light
  • the green discharge cell does not emit light in the subfield SF3 and the discharge cell adjacent to the green discharge cell emits light. You can avoid that.
  • FIG. 9 is a diagram schematically showing a configuration example of the image signal processing circuit 141 used in the plasma display device according to the second embodiment of the present invention.
  • FIG. 9 shows only circuit blocks related to each operation shown in this embodiment, and other circuit blocks are omitted.
  • FIG. 10 is a diagram showing an example of a fourth coding table used in the plasma display device in accordance with the second exemplary embodiment of the present invention.
  • the panel 10 is driven by forming one field by six subfields from the subfield SF1 to the subfield SF6.
  • the coding table of FIG. In order to simplify the above, five subfields from subfield SF1 to subfield SF5 are shown.
  • the fourth coding table shown in FIG. 10 has substantially the same configuration as the third coding table shown in FIG. 8, but the combination of subfields that emit light when the gradation value “13” is displayed is different.
  • the luminance weights of the subfield SF2 and the subfield SF3 are both “2”, and the luminance weight of the subfield SF4 is “4”. Therefore, the luminance when the subfield SF2 and the subfield SF3 simultaneously emit light and the subfield SF4 does not emit light, and the luminance when the subfield SF2 and subfield SF3 simultaneously emit no light and emit the subfield SF4. Are equal to each other.
  • coding in which the subfield SF2 and the subfield SF3 emit light at the same time and the subfield SF4 does not emit light makes the subfield SF2 and the subfield SF3 emit light at the same time and emits the subfield SF4. Can be replaced with coding.
  • the fourth coding table is obtained by replacing the coding in the third coding table that can be replaced based on this rule as described above. That is, the fourth coding table is a “third display combination set”.
  • the image signal processing circuit 141 shown in FIG. 9 has substantially the same configuration as the image signal processing circuit 41 shown in FIG.
  • the image signal processing circuit 141 shown in FIG. 9 is different from the image signal processing circuit 41 shown in FIG. 6 in that the fourth coding table is stored in place of the second coding table 53R corresponding to the red image signal.
  • the fourth coding table is stored in place of the second coding table 53R corresponding to the red image signal.
  • first a storage device that stores a third coding table instead of the second coding table 53B corresponding to the blue image signal.
  • coding table 56B on, also in FIG. 9, simply denoted as” third table ", it lies in using the grant code" 56B ").
  • the selector 55R selects the first coding table 52R when the sustain pulse is applied to each of the scan electrode 22 and the sustain electrode 23 in the subfield SF1 and scans in the subfield SF1.
  • the fourth coding table 56R is selected.
  • the selector 55G selects the first coding table 52G when the sustain pulse is applied to each of the scan electrode 22 and the sustain electrode 23 in the subfield SF1, and the subfield SF1 is selected.
  • the sustain pulse is applied once to each of the scan electrode 22 and the sustain electrode 23, the fourth coding table 56G is selected.
  • the selector 55B selects the first coding table 52B when two or more sustain pulses are applied to each of the scan electrode 22 and the sustain electrode 23 in the subfield SF1, but the subfield SF1 When the sustain pulse is applied once to each of the scan electrode 22 and the sustain electrode 23, the third coding table 56B is selected.
  • the coding data is read from the coding table selected by the selector 55R, and the read data is converted into red image data. Output as.
  • the data conversion unit 54G reads coding data from the coding table selected by the selector 55G based on the green gradation value output from the gradation value conversion unit 51G, and converts the read data to green Output as image data.
  • the data converter 54B reads coding data from the coding table selected by the selector 55B based on the blue tone value output from the tone value converter 51B, and reads the read data into blue Output as image data.
  • the gradation value using the coding in which the subfield SF2 does not emit light can be displayed on the panel.
  • the subfields after the subfield SF3 emit light when the subfields after the subfield SF3 emit light, the subfield SF1 and the subfield SF2 also emit light.
  • the blue tone value is switched to the blue image data by switching between the first coding table and the third coding table.
  • FIG. 9 shows a circuit configuration for this case.
  • the present invention is not limited to this configuration. Which color discharge cell the third coding table is used for and which color discharge cell the fourth coding table is used may be optimally set according to the characteristics of the panel.
  • the drive voltage waveform shown in FIG. 3 is merely an example in the embodiment of the present invention, and the present invention is not limited to these drive voltage waveforms.
  • the circuit configurations shown in FIGS. 5, 6, and 9 are merely examples in the embodiment of the present invention, and the present invention is not limited to these circuit configurations.
  • the number of subfields constituting one field is not limited to the above number.
  • the number of gradations that can be displayed on the panel 10 can be further increased.
  • each circuit block shown in the embodiment of the present invention may be configured as an electric circuit that performs each operation shown in the embodiment, or a microcomputer that is programmed to perform the same operation. May be used.
  • one pixel is constituted by discharge cells of three colors of red, green, and blue.
  • a panel in which one pixel is constituted by discharge cells of four colors or more has been described.
  • the specific numerical values shown in the embodiment of the present invention are set based on the characteristics of the panel 10 having a screen size of 50 inches and the number of display electrode pairs 24 of 1024. It is just an example. The present invention is not limited to these numerical values, and each numerical value is desirably set optimally in accordance with the characteristics of the panel and the specifications of the plasma display device. Each of these numerical values is allowed to vary within a range where the above-described effect can be obtained. Also, the number of subfields constituting one field, the luminance weight of each subfield, etc. are not limited to the values shown in the embodiment of the present invention, and the subfield configuration is based on the image signal or the like. It may be configured to switch.
  • the present invention enhances the effect of suppressing crosstalk, suppresses the influence of crosstalk on the image displayed on the panel when crosstalk occurs, and can display a high-quality image on the panel. Therefore, it is useful as a driving method of a plasma display device and a plasma display device.

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Abstract

Pour augmenter l'effet de suppression de diaphonie dans un dispositif d'affichage à plasma, l'invention porte sur un procédé de pilotage d'un dispositif d'affichage à plasma qui affiche des gradations grâce au fait qu'il est équipé de multiples ensembles de combinaisons d'affichage formés par sélection de multiples combinaisons de sous-champs d'émission de lumière et de sous-champs non d'émission de lumière, les multiples sous-champs qui forment un champ comprenant un premier sous-champ ayant la plus petite pondération de luminance, un deuxième sous-champ positionné immédiatement derrière le premier sous-champ, et un troisième sous-champ positionné immédiatement derrière le deuxième sous-champ. Lorsque le nombre d'impulsions d'entretien appliquées respectivement à l'électrode de balayage et à l'électrode d'entretien durant la période d'entretien pour le premier sous-champ est égal à un pour chacune d'elles, la gradation est affichée à l'aide d'un ensemble de combinaisons d'affichage qui est formé par une combinaison dans laquelle le deuxième sous-champ émet également de la lumière lorsque le troisième sous-champ émet de la lumière.
PCT/JP2011/005698 2010-10-12 2011-10-12 Procédé de pilotage de dispositif d'affichage à plasma et dispositif d'affichage à plasma WO2012049839A1 (fr)

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