CN103250201A - Method for driving plasma display panel, and plasma display apparatus - Google Patents

Method for driving plasma display panel, and plasma display apparatus Download PDF

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Publication number
CN103250201A
CN103250201A CN2012800040440A CN201280004044A CN103250201A CN 103250201 A CN103250201 A CN 103250201A CN 2012800040440 A CN2012800040440 A CN 2012800040440A CN 201280004044 A CN201280004044 A CN 201280004044A CN 103250201 A CN103250201 A CN 103250201A
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China
Prior art keywords
voltage
son
electrode
scan electrode
discharge
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CN2012800040440A
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Chinese (zh)
Inventor
折口贵彦
盐崎裕也
斋藤鲇彦
富冈直之
庄司秀彦
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Publication of CN103250201A publication Critical patent/CN103250201A/en
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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
    • G09G3/288—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
    • G09G3/294—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 lighting or sustain discharge
    • G09G3/2942—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 lighting or sustain discharge with special waveforms to increase luminous efficiency
    • 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
    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/066—Waveforms comprising a gently increasing or decreasing portion, e.g. ramp
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • 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

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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)
  • Control Of Gas Discharge Display Tubes (AREA)

Abstract

A stable write operation is performed during driving of a high-definition large-screen plasma display panel. The following field is therefore generated in a method for driving a plasma display panel in which a plurality of displaying combinations used to display gradations is selected from among a plurality of combinations having different combinations of light-emitting subfields and non-light-emitting subfields, the selected displaying combinations are designated as a set, a single displaying combination is selected from the set, and light emission or non-emission of discharge cells is controlled. The field has a subfield in which an upwardly inclined waveform voltage that increases from a base electric potential to a first predetermined voltage is applied to a scanning electrode after the final sustain pulse is generated in a sustain period, on the basis of the displaying combination included in the set of displaying combinations. The field also has a specific subfield in which a downwardly inclined waveform voltage that decreases from a base electric potential to a second predetermined voltage is applied to the scanning electrode after the final sustain pulse is generated in a sustain period, and an upwardly inclined waveform voltage is then applied to the scanning electrode.

Description

The driving method of Plasmia indicating panel and plasma display system
Technical field
The plasma display system of interchange surface discharge type Plasmia indicating panel and the driving method of Plasmia indicating panel have been the present invention relates to use.
Background technology
As Plasmia indicating panel (below, slightly be designated as " panel ") and representational interchange surface discharge type panel is formed with a plurality of discharge cells between the front substrate of arranged opposite and back substrate.
Front substrate has formed many to by 1 pair of scan electrode with to keep the show electrode that electrode constitutes right on the glass substrate of front surface side parallel to each other.And, form dielectric layer and protective seam, right to cover these show electrodes.
Back substrate has formed a plurality of parallel data electrodes on the glass substrate of side overleaf, and has formed dielectric layer covering these data electrodes, and has formed a plurality of next doors abreast with data electrode on dielectric layer.And, be formed with luminescent coating on the surface of dielectric layer and the side in next door.
And arranged opposite front substrate and back substrate also seal so that show electrode to the data electrode crossings on different level.In the discharge space of sealed inside, enclose the discharge gas for example in intrinsic standoff ratio, comprise 5% xenon, at show electrode to forming discharge cell with the opposed part of data electrode.In the panel of this structure, in each discharge cell, produce ultraviolet ray by gas discharge, and come the fluorophor of excitated red (R), green (G) and blue (B) each color to make it luminous by this ultraviolet ray, carry out coloured image thus and show.
The method that in the image display area of panel, shows image as the luminous and non-luminous 2 value controls in the combined discharge unit, the general son method of using.
In a son method, be divided into the mutually different a plurality of sons of luminosity field with 1.Then, in each discharge cell, make up accordingly by the gray-scale value with expectation, control the luminous, not luminous of each son field.Thus, the gray-scale value that 1 luminosity is made as expectation makes each discharge cell luminous, in the image display area of panel, shows the image that constitutes by various gray-scale values.
In son method, during each son field comprises initialization, write during and keep during.
During initialization, apply waveform of initialization to each scan electrode, carry out in each discharge cell, producing the initialization action of initialization discharge.Thus, in each discharge cell, form the required wall electric charge of follow-up write activity, and produce the triggering particle (for generation of the excited particles of discharge) that writes discharge stability ground and take place for making.
During writing, apply scanning impulse successively to scan electrode, and optionally apply to data electrode based on the picture signal that should show and to write pulse.Thus, between the scan electrode that should carry out luminous discharge cell and data electrode, produce and write discharge, formation wall electric charge in this discharge cell (below, also these actions are referred to as " writing ").
During keeping, to by scan electrode with keep show electrode that electrode constitutes to alternately applying based on the number of sustain pulses by each son luminance weights of determining.Thus, in producing the discharge cell that writes discharge, produce and keep discharge, make the luminescent coating of this discharge cell luminous (below, also will make the luminous situation of discharge cell be labeled as " lighting " by keeping discharge, non-luminous situation is labeled as " non-lighting ").Thus, in each son field, make each discharge cell with luminous with the corresponding brightness of luminance weights.Thus, make each discharge cell of panel with luminous with the corresponding brightness of the gray-scale value of picture signal, thereby in the image display area of panel, show image.
Once disclosed during keeping, to show electrode right keep the applying after the end of pulse, produce the technology (for example, with reference to patent documentation 1) of faint discharge (cancellation discharge) to keeping the tilt voltage that electrode applies rising.By producing the cancellation discharge, thus cancellation by the wall electric charge in the discharge cell of keeping discharge and generating, relax show electrode to potential difference (PD), write discharge in stably producing during the writing of follow-up son thus.
In addition, following technology (for example with reference to patent documentation 2) is disclosed: in during keeping to show electrode right keep the applying after the end of pulse, be applied with to rise to scan electrode and make behind the assigned voltage this voltage keep tilt voltage during certain, afterwards, come wall electric charge in the cancellation discharge cell to keeping tilt voltage that electrode applies rising.
In addition, following technology (for example with reference to patent documentation 3) is disclosed: in during keeping to show electrode right keep the applying after the end of pulse, apply the tilt voltage of rising and change this inclination according to the mean flow rate that shows image to scan electrode, with the wall electric charge in the cancellation discharge cell.
In realizing the big picture panel of high-fineness, except the number of electrodes that must drive can increase, the impedance during driving also can increase, so had the write activity unsettled tendency that becomes easily.Therefore, in the plasma display system that has possessed this panel, also requirement stably produces and writes discharge and stably show image on panel.
[technical literature formerly]
[patent documentation]
[patent documentation 1] TOHKEMY 2004-348140 communique
[patent documentation 2] TOHKEMY 2005-141224 communique
[patent documentation 3] TOHKEMY 2003-5700 communique
Summary of the invention
The present invention is a kind of driving method of panel, this panel has possessed a plurality of discharge cells, each discharge cell has by scan electrode and to keep the show electrode that electrode constitutes right, and data electrode, by have in discharge cell that should be luminous, produce write the writing of discharge during, produce with the corresponding number of sustain pulses of luminance weights impose on show electrode right keep during a plurality of sons constitute 1, among a plurality of combination different with non-luminous sub combination of luminous son, select a plurality of demonstrations that show for gray scale to generate the demonstration composite set with combination, be subordinated to based on picture signal and show the luminous/not luminous panel that drives of controlling discharge cell with the demonstration of composite set with the demonstration of selecting 1 demonstration with combination among the combination, use to select with combination by each son.In this driving method, based on showing that the demonstration that comprises with composite set with combination, produces following field.This has following son field, i.e. last keeping after the pulse during generation is kept applies the up tilt waveform voltage that rises to the 1st assigned voltage from rheobase to scan electrode.In addition, this has following particular subfield, i.e. last keeping after the pulse during generation is kept applies the descending tilt waveform voltage that drops to the 2nd assigned voltage from rheobase to scan electrode, is applied with the line tilt waveform voltage to scan electrode afterwards.
By this method, when driving the big picture panel of high-fineness, also can carry out stable write activity, can be on panel the high image of display quality.
In addition, in the driving method of panel of the present invention, have the 1st and show with composite set and the 2nd demonstration composite set.Show with in the composite set that the 1st in 1, earlier luminous son and time go up between the luminous son in back and do not produce the continuous non-luminous son field more than 2 in time.Show with in the composite set that the 2nd in 1, earlier luminous son and time go up between the luminous son in back and produces the continuous non-luminous son field more than 2 in time.And, when showing image, panel do not produce particular subfield in use the 1st demonstration with composite set, when using the 2nd demonstration to use composite set at panel demonstration image, produce particular subfield.
In addition, in the driving method of panel of the present invention, also can the 2nd show that going up the son field that produces earlier with the time in the continuous non-luminous son more than 2 in the composite set is particular subfield.
In addition, the present invention is a kind of driving method of panel, this panel has possessed a plurality of discharge cells, each discharge cell has by scan electrode and to keep the show electrode that electrode constitutes right, and data electrode, by during having an initialization, generation writes during the writing of discharge in discharge cell that should be luminous, with generation and the corresponding number of sustain pulses of luminance weights impose on show electrode right keep during a plurality of sons constitute 1, among a plurality of combination different with non-luminous sub combination of luminous son, select a plurality of demonstrations that show for gray scale to generate the demonstration composite set with combination, being subordinated to demonstration based on picture signal uses the demonstration of composite set to make up with selecting 1 demonstration to use among the combination, the demonstration that use is selected with combination by each son field control discharge cell luminous/not luminous, drive described panel thus.In this driving method, the 1st seed field and the 2nd seed field are set in 1.In the 1st seed field, exist in the scan electrode of the 1st descending tilt waveform voltage that is applied with the up tilt waveform voltage that rises to the voltage that in discharge cell, produces discharge during the initialization and descends to negative voltage and be applied to discharge cell and do not produce the voltage of discharge and the scan electrode of the 1st descending tilt waveform voltage.In the 2nd seed field, during initialization, apply to scan electrode and only to drop to immediately following the 2nd descending tilt waveform voltage that produced the voltage that generation is discharged in the discharge cell that writes discharge in the preceding son.And, apply to scan electrode during the initialization of the 1st seed field the 1st descending tilt waveform voltage during, apply the 1st voltage to data electrode.In addition, apply to scan electrode during the initialization of the 2nd seed field the 2nd descending tilt waveform voltage during, apply 2nd voltage higher than the 1st voltage to data electrode.And, based on showing that the demonstration that comprises with composite set with combination, produces following field.This has following son field, namely produces last the keeping after the pulse during keeping, and applies the up tilt waveform voltage that rises to the 1st assigned voltage from rheobase to scan electrode.In addition, this has following particular subfield, i.e. last keeping after the pulse during generation is kept applies the 3rd descending tilt waveform voltage that drops to the 2nd assigned voltage from rheobase to scan electrode, is applied with the line tilt waveform voltage to scan electrode afterwards.
By this method, even when driving the big picture panel of high-fineness, also can carry out stable write activity, can be on panel the high image of display quality.In addition, can reduce shiny black degree, can show the high image of contrast at panel.
In addition, in the driving method of panel of the present invention, have the 1st and show with composite set and the 2nd demonstration composite set.Show with in the composite set that the 1st in 1, earlier luminous son and time go up between the luminous son in back and do not produce the continuous non-luminous son field more than 2 in time.Show with in the composite set that the 2nd in 1, earlier luminous son and time go up between the luminous son in back and produces the continuous non-luminous son field more than 2 in time.And, using the 1st to show that showing at panel that image makes with composite set does not produce particular subfield, and using the 2nd to show with composite set generation particular subfield when panel shows image.
In addition, in the driving method of panel of the present invention, also can the 2nd show that going up the son field that produces earlier with the time in the continuous non-luminous son more than 2 in the composite set is particular subfield.
In addition, in the driving method of panel of the present invention, also the minimum voltage of the 2nd descending tilt waveform voltage can be set at the voltage higher than the minimum voltage of the 1st descending tilt waveform voltage, produce the 2nd descending tilt waveform voltage thus.
In addition, in the driving method of panel of the present invention, apply to scan electrode the 1st descending tilt waveform voltage during, apply positive voltage to keeping electrode, apply to scan electrode the 2nd descending tilt waveform voltage during, apply the voltage higher than above-mentioned positive voltage to keeping electrode.
In addition, the present invention is a kind of plasma display system, this plasma display device possesses the panel that comprises a plurality of discharge cells and constitutes 1 driving circuit that drives panel by a plurality of sons field, wherein, each discharge cell have by scan electrode and keep show electrode that electrode constitutes to and data electrode, each son field have in discharge cell that should be luminous, produce write during the writing of discharge and generation and the corresponding number of sustain pulses of luminance weights impose on show electrode right keep during.In this plasma display device, driving circuit selects a plurality of demonstrations that show for gray scale to generate the demonstration composite set with combination among a plurality of combination different with non-luminous sub combination of luminous son.And, be subordinated to demonstration based on picture signal and use the demonstration of composite set to make up with selecting 1 demonstration to use among the combination.And, use the demonstration select with combination by each son control discharge cell luminous/not luminous.And, based on showing that the demonstration that comprises with composite set with combination, produces following field and drives panel.This has following son field, i.e. last keeping after the pulse during generation is kept applies the up tilt waveform voltage that rises to the 1st assigned voltage from rheobase to scan electrode.In addition, this has following particular subfield, namely produces last the keeping after the pulse during keeping, and applies the descending tilt waveform voltage that drops to the 2nd assigned voltage from rheobase to scan electrode, is applied with the line tilt waveform voltage to scan electrode afterwards.
Thus, even when driving the big picture panel of high-fineness, also can carry out stable write activity, can be on panel the high image of display quality.
In addition, in plasma display system of the present invention, driving circuit has the 1st and shows with composite set and the 2nd demonstration composite set.And driving circuit is using the 1st to show with the incompatible particular subfield that do not produce when panel shows image of combination of sets, is using the 2nd to show with the incompatible particular subfield that produces when panel shows image of combination of sets.The 1st shows with composite set do not produce the continuous non-luminous sub-field more than 2 between the luminous son in back on earlier luminous son and time in time in 1.The 2nd shows with composite set produce the continuous non-luminous son field more than 2 between the luminous son in back on earlier luminous son and time in time in 1.
In addition, the present invention is a kind of plasma display system, it possesses the panel that comprises a plurality of discharge cells and constitutes 1 driving circuit that drives panel by a plurality of sons field, wherein, each discharge cell have by scan electrode and keep show electrode that electrode constitutes to and data electrode, during each son field has an initialization, in discharge cell that should be luminous, produce write during the writing of discharge and generation and the corresponding number of sustain pulses of luminance weights impose on show electrode right keep during.In this plasma display device, driving circuit selects a plurality of demonstrations that show for gray scale to generate the demonstration composite set with combination among a plurality of combination different with non-luminous sub combination of luminous son.And, be subordinated to demonstration based on picture signal and use the demonstration of composite set to make up with selecting 1 demonstration to use among the combination.And, use the demonstration select with combination by each son control discharge cell luminous/not luminous.And, the 1st seed field is set in 1 and the 2nd seed field drives panel.In the 1st seed field, during initialization, there is the scan electrode of the 1st descending tilt waveform voltage be applied with the up tilt waveform voltage that rises to the voltage that in discharge cell, produces discharge and descend to negative voltage and is applied to the voltage that do not produce discharge in the discharge cell and the scan electrode of the 1st descending tilt waveform voltage.In the 2nd seed field, during initialization, apply to scan electrode and only to drop to immediately following the 2nd descending tilt waveform voltage that produced the voltage that generation is discharged in the discharge cell that writes discharge in the preceding son.And, apply to scan electrode during the initialization of the 1st seed field the 1st descending tilt waveform voltage during, apply the 1st voltage to data electrode.Apply to scan electrode during the initialization of the 2nd seed field the 2nd descending tilt waveform voltage during, apply 2nd voltage higher than the 1st voltage to data electrode.And, based on showing that the demonstration that comprises with composite set with combination, produces following field and drives panel.This has following son field, i.e. last keeping after the pulse during generation is kept applies the up tilt waveform voltage that rises to the 1st assigned voltage from rheobase to scan electrode.In addition, this has following particular subfield, i.e. last keeping after the pulse during generation is kept applies the 3rd descending tilt waveform voltage that drops to the 2nd assigned voltage from rheobase to scan electrode, is applied with the field of the particular subfield of line tilt waveform voltage afterwards to scan electrode.
Thus, even when driving the big picture panel of high-fineness, also can carry out stable write activity, can be on panel the high image of display quality.In addition, can reduce shiny black degree, can show the high image of contrast at panel.
Description of drawings
Fig. 1 is the exploded perspective view of the employed panel construction of plasma display system of expression embodiments of the present invention 1.
Fig. 2 is the electrode spread figure of the employed panel of plasma display system of embodiments of the present invention 1.
Fig. 3 is the figure of an example of employed the 1st coding form of plasma display system of expression embodiments of the present invention 1.
Fig. 4 is the figure of an example of employed the 2nd coding form of plasma display system of expression embodiments of the present invention 1.
The figure of Fig. 5 the 1st driving voltage waveform that to be expression apply to each electrode of the employed panel of plasma display system of embodiments of the present invention 1.
The figure of Fig. 6 the 2nd driving voltage waveform that to be expression apply to each electrode of the employed panel of plasma display system of embodiments of the present invention 1.
Fig. 7 is the figure of the relation of the expression voltage Vr of embodiments of the present invention 1 and the voltage difference between the voltage difference between the voltage Vs and voltage Vi4 and the voltage Va.
Fig. 8 is the circuit block diagram of the plasma display system of embodiments of the present invention 1.
Fig. 9 is the circuit diagram of structure of scan electrode driving circuit that schematically shows the plasma display system of embodiments of the present invention 1.
Figure 10 is the circuit diagram of the structure of keeping electrode drive circuit that schematically shows the plasma display system of embodiments of the present invention 1.
Figure 11 is the circuit diagram of structure of data electrode driver circuit that schematically shows the plasma display system of embodiments of the present invention 1.
The figure of Figure 12 the 1st driving voltage waveform that to be expression apply to each electrode of the employed panel of plasma display system of embodiments of the present invention 2.
The figure of Figure 13 the 2nd driving voltage waveform that to be expression apply to each electrode of the employed panel of plasma display system of embodiments of the present invention 2.
Figure 14 schematically shows the figure that applies the relation between the scan electrode of forcing waveform of initialization and the field in embodiments of the present invention 2.
Figure 15 is the sequential chart for the action of the driving circuit of the plasma display system of explanation embodiments of the present invention 2.
The figure of one example of Figure 16 the 1st driving voltage waveform that to be expression apply to each electrode of the employed panel of plasma display system of embodiments of the present invention 3.
The figure of one example of Figure 17 the 2nd driving voltage waveform that to be expression apply to each electrode of the employed panel of plasma display system of embodiments of the present invention 3.
The figure of another example of Figure 18 the 1st driving voltage waveform that to be expression apply to each electrode of the employed panel of plasma display system of embodiments of the present invention 3.
The figure of another example of Figure 19 the 2nd driving voltage waveform that to be expression apply to each electrode of the employed panel of plasma display system of embodiments of the present invention 3.
The figure of other examples of the waveform shape of Figure 20 up tilt waveform voltage that to be expression produce in order to carry out the cancellation action in during the keeping of 1 of embodiments of the present invention 3 final son.
Other routine oscillograms of the waveform shape of Figure 21 descending tilt waveform voltage that to be expression apply to the scan electrode of embodiments of the present invention.
Figure 22 is the figure of other examples of the 2nd coding form of expression embodiments of the present invention.
Embodiment
Below, utilize the plasma display system of description of drawings embodiments of the present invention.
(embodiment 1)
Fig. 1 is the exploded perspective view of structure of the employed panel 10 of plasma display system of expression embodiments of the present invention 1.
On the front substrate 21 of glass system, form a plurality of by scan electrode 22 with keep show electrode that electrode 23 constitutes to 24.And, form dielectric layer 25 with covering scan electrode 22 and keep electrode 23, and form protective seams 26 at this dielectric layer 25.
In order to be easy to generate the discharge in the discharge cell, by the high material of evaporation of electron performance, namely be that the material of major component has formed protective seam 26 with magnesium oxide (MgO).
Protective seam 26 can be made of one deck, perhaps also can be made of multilayer.In addition, also can be the structure that has particle on the layer.
Form a plurality of data electrodes 32 overleaf on the substrate 31, form dielectric layer 33 with covers data electrode 32, further form the next door 34 of well word shape at this dielectric layer 33.And the side of next door 34 and dielectric layer 33 are provided with the luminescent coating 35 of the light that sends redness (R), green (G) and blue (B) these each colors.
Above-mentioned front substrate 21 become to clip small discharge space with back substrate 31 arranged opposite and make show electrode to 24 and data electrode 32 intersect, in the gap between substrate 21 and the back substrate 31 discharge space is set in front.Then, seal its peripheral part by encapsulants such as frits.Then, enclose the mixed gas of for example neon (Ne) and xenon (Xe) as discharge gas to the discharge space of inside.
Discharge space is divided into a plurality of sections by next door 34, show electrode to 24 and data electrode 32 part of intersecting form the discharge cell that constitutes pixel.And, by making the discharge of these discharge cells, luminous (lighting), thus on panel 10 color display.
In addition, in panel 10, by be arranged in show electrode to 3 the continuous discharge cells on 24 directions of extending, namely send the discharge cell of redness (R) light, these 3 discharge cells of discharge cell that send the discharge cell of green (G) light and send blueness (B) light constitute 1 pixel.
In addition, the structure of panel 10 is not limited to above-mentioned formation, also can possess for example next door of striated.In addition, the mixture ratio of discharge gas for example is that the xenon dividing potential drop is 10%, but in order to improve the luminescence efficiency in the discharge cell, also can further improve the xenon dividing potential drop, can be other mixture ratios.
Fig. 2 is the electrode spread figure of the employed panel 10 of the plasma display system of embodiments of the present invention 1.
In panel 10, arrange n root scan electrode SC1～scan electrode SCn (scan electrode 22 of Fig. 1) of being extended along horizontal direction (row (line) direction) and n root and kept electrode SU1～keep electrode SUn (Fig. 1 keep electrode 23), and arranged the m single data electrode D1～data electrode Dm (Fig. 1 D data electrode 32) that is extended along vertical direction (column direction).
And, 1 couple of scan electrode SCi (i=1～n) and keep electrode SUi, with 1 data electrode Dj (1 discharge cell of formation in the zone of j=1～m) intersect.That is, form m discharge cell at 1 pair of show electrode to 24, form m/3 pixel.And, in discharge space, form m * n discharge cell, and the zone that has formed m * n discharge cell becomes the image display area of panel 10.For example, in pixel count is 1920 * 1080 panel, m=1920 * 3, n=1080.In addition, n=1080 in the present embodiment, but the present invention is not limited to these numerical value at all.
The driving method of panel 10 of the plasma display system of present embodiment then, is described.In addition, the plasma display system of present embodiment carries out the gray scale demonstration by a son method.In a son method, be divided into a plurality of sons field with 1 at time shaft, each son field is set luminance weights respectively.During each height field comprises initialization, write during and keep during.And, control the luminous, not luminous of each discharge cell by pressing each son field, thereby show image at panel 10.
Luminance weights is illustrated in the ratio of the size of the brightness that shows in each son field, in each son field, produces and the corresponding number of sustain pulses of luminance weights during keeping.Therefore, for example, luminance weights is that the son of " 8 " is luminous for about 8 times brightness of the son of " 1 " with luminance weights, be that about 4 times brightness of son field of " 2 " is luminous with luminance weights.Therefore, can each son field is optionally luminous to show various gray scales to make with the corresponding combination of picture signal, show image thus.
The example that is described as follows in the present embodiment: with 1 be divided into 5 sons (son SF1, a son SF2 ..., son SF5), son SF1 has the luminance weights of (1,2,4,8,16) respectively to each son of a son SF5 so that the son after leaning on the time then luminance weights is more big.
During initialization, produce the initialization discharge, carry out forming the follow-up initialization action that writes the required wall electric charge of discharge at each electrode.The initialization action of this moment has in all discharge cells whole unit initialization action of producing the initialization discharge and to optionally producing the selection initialization action that initialization is discharged immediately following producing the discharge cell of keeping discharge during the keeping of preceding son.
During writing, in discharge cell that should be luminous, optionally produce and write discharge, form the write activity of keeping the required wall electric charge of discharge.
Then, during keeping, alternately apply 24 to show electrode and to keep pulse, carry out in producing the discharge cell that writes discharge, producing keeping discharge make this discharge cell luminous keep action.
In addition, in the present embodiment, in a plurality of son, carry out whole unit initialization action in during the initialization of 1 son, select initialization action in during initialization of other sons.Below, the son field that will carry out whole unit initialization action is called " all initial beggar fields, unit ", will select the son field of initialization action to be called " selecting initial beggar field ".
The example that is described as follows in the present embodiment: carry out whole unit initialization action during the initialization of a son SF1, a SF2 selects initialization action during the initialization of a son SF5 at son.Thus, only become the luminous of the discharge of following the whole unit initialization action among the son SF1 with irrelevant luminous of the demonstration of image.Therefore, do not produce the black viewing area of keeping discharge brightness, be that shiny black degree only becomes the Weak-luminescence in whole unit initialization action, can show the high image of contrasts at panel 10.
In addition, during the keeping of each son in, be applied to the proportionality constant of the regulation that multiplies each other on the luminance weights of each height field to 24 and the number of sustain pulses that obtains to show electrode respectively.This proportionality constant is the brightness multiplying power.
Therefore, for example, when the brightness multiplying power is 2 times, in luminance weights for during the keeping of the son of " 2 ", respectively to scan electrode 22 with keep electrode 23 and apply four times and keep pulse.Therefore, the quantity of keeping pulse that produces during this is kept is 8.
But present embodiment is not quantity or each sub the luminance weights that constitutes 1 son field will be defined as above-mentioned value.In addition, also can be based on picture signal and wait to switch a son structure that constitutes.
Then, illustrate and make discharge cell with the method luminous with the corresponding brightness of size of gray scale.In addition, below will make discharge cell also to be called " display gray scale " with the luminous situation of the corresponding brightness of size of gray scale.
As mentioned above, in the present embodiment, constitute 1 by a plurality of sons field that has preestablished luminance weights.And, among the different a plurality of combinations of the combination between luminous sub-field and the non-luminous son field, select a plurality of demonstrations for the gray scale demonstration to use and make up, generate " demonstration composite set ".Below, the combination between luminous son field and the non-luminous son field is called " coding ".In addition, will be called " showing with encoding " for the combination (showing with combination) of the demonstration of gray scale.In addition, will show with composite set and be called " coding form ".
And, from coding form, select 1 demonstration with encoding based on picture signal, use this demonstration to control the luminous, not luminous of discharge cell, display gray scale on panel 10 thus with coding by each sub.
Then, employed coding form in the present embodiment is described.In addition, below, for the purpose of simplifying the description, the brightness value during with demonstration black is labeled as brightness value " 0 ", and the brightness value corresponding with luminance weights " N " is labeled as brightness value " N ".For example, having only luminance weights is that the luminous shown brightness value of discharge cell of son SF1 of " 1 " is brightness value " 1 ", to make luminance weights be the son SF1 of " 1 " and luminance weights for the son luminous shown brightness value of discharge cell of SF2 of " 2 " be brightness value " 3 ".
Plasma display system in the present embodiment possesses the demonstration different a plurality of coding forms of coded number.In the present embodiment, a plurality of coding forms are to show with the 1st many coding form of coded number (the 1st show use composite set) and show with the 2nd few coding form of coded number (the 2nd demonstration composite set).
Fig. 3 is the figure of an example of employed the 1st coding form of plasma display system of expression embodiments of the present invention 1.
Fig. 4 is the figure of an example of employed the 2nd coding form of plasma display system of expression embodiments of the present invention 1.
Coding form when Fig. 3, Fig. 4 represent to be constituted 1 and a son SF1 and had the luminance weights of (1,2,4,8,16) respectively to each son of a son SF5 by 5 sons (son SF1, a son SF2, a son SF3, a son SF4, a son SF5).
In addition, in Fig. 3, Fig. 4, left end at each coding form lists the size that is shown in the brightness value on the discharge cell with numeric representation, luminous, non-luminous combination of each the son field when each row expression that records numerical value is shown in discharge cell with this brightness value.In addition, in each coding form that Fig. 3, Fig. 4 make, empty hurdle is represented not luminous, and " zero " expression is luminous.
For example, when using the 1st coding form to show image, on discharge cell during display brightness value " 3 ", make discharge cell luminous for the son SF1 of " 1 " and luminance weights for the son SF2 of " 2 " by luminance weights.On discharge cell during display brightness value " 23 ", make this discharge cell luminous for the son SF3 of " 4 " and luminance weights for the son SF5 of " 16 " for the son SF2 of " 2 ", luminance weights for the son SF1 of " 1 ", luminance weights by luminance weights.
The 1st coding form shown in Figure 3 is the coding form that shows 12 kinds of brightness values.That is, the 1st coding form has 12 demonstrations with encoding.And the 1st coding form has " make all the time son SF1 luminous " such rule in the discharge cell of display brightness value more than ' 1 '.In addition, has " in 1, on the time between the latest Zi Chang and the son SF1, non-luminous son field is below 1 in luminous son " such rule.This rule also can be described as " in 1, on the time between the latest Zi Chang and the son SF1, can not produce non-luminous son field continuously in luminous son ".
And, in the present embodiment, shown in the example of Fig. 3, in 1, on time earlier luminous son, go up between the luminous son in back with the time, the coding form that does not produce continuous non-luminous son more than 2 is called the 1st coding form (the 1st demonstration composite set).
The 2nd coding form shown in Figure 4 is the coding form that shows 8 kinds of brightness values.That is, the 2nd coding form has 8 demonstrations with encoding.And the 2nd coding form is identical with the 1st coding form, has " in the discharge cell that shows the brightness value that " 1 " is above, make all the time son field SF1 luminous " such rule.In addition, the 2nd coding form has " make all the time son SF2 not luminous " such rule and " in 1, on the time between the latest Zi Chang and the son SF2, non-luminous son field is below 1 in luminous son " such rule.
According to this rule, in the 2nd coding form shown in Figure 4, shown in the arrow of Fig. 4, producing a son SF2 becomes the non-brightness value of lighting (brightness value " 9 ", brightness value " 25 ") continuously with a son SF3.In other words, the 2nd coding form is the coding form with " in 1, in luminous son on the time between the latest Zi Chang and the son SF1, producing the demonstrations of 2 non-luminous sons continuously with encoding ".Below, the situation brief note that will " in 1, in luminous son on the time between the latest Zi Chang and the son SF1, produce 2 non-luminous sons continuously " is " producing 2 non-luminous son fields continuously ".
Thus, the 1st coding form shown in Figure 3 is the coding form with " can not produce the demonstration of non-luminous son field more than 2 continuously with encoding ", and the 2nd coding form shown in Figure 4 is the coding form with " producing 2 non-luminous sub demonstrations coding continuously ".Therefore, when using the 2nd coding form to show image, might produce 2 non-luminous son fields continuously.
And, in the present embodiment, shown in the example of Fig. 4, in 1, with earlier luminous son and time go up the coding form that produces the continuous non-luminous son more than 2 between the luminous son in back and is called the 2nd coding form (the 2nd demonstration composite set) in time.
Below, coding form slightly is designated as " form ", the 1st coding form slightly is designated as " the 1st form ", the 2nd coding form slightly is designated as " the 2nd form ".
In addition, the 1st form shown in Figure 3 does not possess the coding of the such even number brightness value of display brightness value " 2 ", brightness value " 4 ", brightness value " 6 ".Therefore, when using the 1st form to show image, can not show the even number brightness value.In addition, the 2nd form shown in Figure 4 does not possess the coding of the such brightness value of display brightness value " 2 ", brightness value " 3 ", brightness value " 4 ", brightness value " 6 ", brightness value " 7 ", brightness value " 8 ".Therefore, when using the 2nd form to show image, can not show these brightness values.But, for the brightness value this, that form does not possess, can use general known shake (dither) processing or error diffusion to handle virtually and show.
And the plasma display system of present embodiment possesses Fig. 3, the 1st form and the 2nd form shown in Figure 4, switches based on picture signal and uses these 2 forms.For example, be judged as when consuming the few image of electric power in demonstration, use the 1st form that image is shown in panel 10, be judged as when consuming the many image of electric power in demonstration, use the 2nd form that image is shown in panel 10.
In addition, the plasma display system of present embodiment possesses a plurality of driving voltage waveform, switches according to coding form and uses the driving voltage waveform that puts on panel 10.In the present embodiment, a plurality of driving voltage waveform are the 1st driving voltage waveform and the 2nd driving voltage waveform.And, when using the 1st coding form to show image, produce the 1st driving voltage waveform and be applied to each electrode of panel 10.In addition, when using the 2nd coding form to show image, produce the 2nd driving voltage waveform and be applied to each electrode of panel 10.Then, these driving voltage waveform are described.
Fig. 5 is the figure of the 1st driving voltage waveform of each electrode of the expression employed panel 10 of plasma display system that imposes on embodiments of the present invention 1.
Fig. 5 represents to impose on respectively the scan electrode SC1, the scan electrode SCn that carries out write activity during writing at last that carry out write activity during writing at first, keeps electrode SU1～keep electrode SUn, and the driving voltage waveform of data electrode D1～data electrode Dm.
In addition, Fig. 5 is illustrated in the driving voltage waveform of 2 different sons of the waveform shape of the driving voltage that is applied to scan electrode SC1～scan electrode SCn during the initialization.These 2 son fields are the sub SF2 that select initial beggar field as a son SF1 and the conduct of whole initial beggar fields, unit.
In addition, the interior generation of keeping pulse during keeping of the driving voltage waveform of other son fields is counted the difference roughly the same with the driving voltage waveform of a son SF2.In addition, following scan electrode SCi, keep electrode SUi, data electrode Dk and represent the electrode from each electrode, selected based on view data (representing the lighting of each son, the non-data of lighting).
At first, all son SF1 of initial beggar fields, unit of conduct are described.
First half during the initialization of son SF1 is to data electrode D1～data electrode Dm, keep electrode SU1～keep electrode SUn to apply voltage 0 (V) respectively.Apply voltage Vi1 to scan electrode SC1～scan electrode SCn.It is voltage less than discharge ionization voltage that voltage Vi1 is set to for keeping electrode SU1～keep electrode SUn.
In addition, apply the tilt waveform voltage that slowly rises from voltage Vi1 to voltage Vi2 to scan electrode SC1～scan electrode SCn.Below, this tilt waveform voltage is called " upward slope voltage L1 ".In addition, to be set to for keeping electrode SU1～keep electrode SUn be the voltage that surpasses discharge ionization voltage to voltage Vi2.In addition, as an example of the gradient of this upward slope voltage L1, can enumerate the such numerical value of about 1.3V/ μ sec.
This upward slope voltage L1 rise during, continue the faint initialization of generation respectively between electrode SU1～keep between the electrode SUn and scan electrode SC1～scan electrode SCn and the data electrode D1～data electrode Dm and discharge with keeping at scan electrode SC1～scan electrode SCn.And, accumulate negative wall voltage at scan electrode SC1～scan electrode SCn, and on data electrode D1～data electrode Dm and keep electrode SU1～keep electrode SUn and accumulate positive wall voltage.And, also produce the triggering particle that helps discharge generation afterwards.
Wall voltage on this electrode represent by on the dielectric layer of coated electrode, on the protective seam, the voltage of the first-class wall charge generation of accumulating of luminescent coating.
Latter half during initialization to keeping electrode SU1～keep electrode SUn to apply positive voltage Ve, applies voltage 0 (V) to data electrode D1～data electrode Dm as the 1st voltage.Apply the 1st descending tilt waveform voltage that slowly descends to negative voltage Vi4 from voltage Vi3 to scan electrode SC1～scan electrode SCn.
Below, the 1st descending tilt waveform voltage is called " descending voltage L2 ".It is voltage less than discharge ionization voltage that voltage Vi3 is set to for keeping electrode SU1～keep electrode SUn, and it is the voltage that surpasses discharge ionization voltage that voltage Vi4 is set to for keeping electrode SU1～keep electrode SUn.In addition, as an example of the gradient of this descending voltage L2, for example can enumerate the numerical value of pact-2.5V/ μ sec.In addition, voltage Vi4 equals the superposeed voltage of voltage Vset2 at the negative voltage Va that produces scanning impulse described later.
Apply to scan electrode SC1～scan electrode SCn descending voltage L2 during, scan electrode SC1～scan electrode SCn and keep electrode SU1～keep between the electrode SUn and scan electrode SC1～scan electrode SCn and data electrode D1～data electrode Dm between produce faint initialization discharge respectively.
And, the negative wall voltage on scan electrode SC1～scan electrode SCn and to keep the positive wall voltage of electrode SU1～keep on the electrode SUn weakened, the positive wall voltage on data electrode D1～data electrode Dm is adjusted to the value that is fit to write activity.In addition, also produce the triggering particle help the discharge generation after this.In carrying out during follow-up writing, shortens on this triggering particle the action of the discharge delay time that writes discharge.Discharge delay time is that the voltage that imposes on discharge cell surpasses the time that discharge ionization voltage begins to produce up to reality discharge position.
By above action, finish in all discharge cells, to produce whole unit initialization action of initialization discharge.
Below, will carry out whole unit initialization action during be called " all unit initialization during ".In addition, the driving voltage waveform that will produce in order to carry out whole unit initialization action is labeled as " all unit waveform of initialization ".
During follow-up writing, apply the scanning impulse that voltage is Va successively to scan electrode SC1～scan electrode SCn.In data electrode D1～data electrode Dm, apply the pulse that writes of positive voltage Vd to the data electrode Dk corresponding with answering luminous discharge cell.Thus, in each discharge cell, optionally produce and write discharge.
Particularly, then latter half during the initialization applies voltage 0 (V) to data electrode D1～data electrode Dm, to keeping electrode SU1～keep electrode SUn to apply voltage Ve, applies voltage Vc to scan electrode SC1～scan electrode SCn.
Then, apply the scanning impulse of negative voltage Va to the 1st line scanning electrode SC1 that carries out write activity at first.Simultaneously, in the 1st line data electrode in data electrode D1～data electrode Dm, apply the pulse that writes of positive voltage Vd to the data electrode Dk that answers luminous discharge cell.At this moment, the voltage difference of the cross part of data electrode Dk and scan electrode SC1 becomes the difference of poor (the voltage Vd-voltage Va) that externally apply voltage gone up addition wall voltage on the data electrode Dk and the wall voltage on the scan electrode SC1 and the value that obtains.Thus, the voltage difference between data electrode Dk and the scan electrode SC1 surpasses discharge ionization voltage, produces discharge between data electrode Dk and scan electrode SC1.
In addition, because to keeping electrode SU1～keep electrode SUn to apply voltage Ve, therefore keep the value that voltage difference between electrode SU1 and the scan electrode SC1 has become addition on poor (the voltage Ve-voltage Va) that externally applies voltage and keeps the difference of wall voltage on the electrode SU1 and the wall voltage on the scan electrode SC1 and obtained.At this moment, by voltage Ve being set at the magnitude of voltage of the degree lower slightly than discharge ionization voltage, thereby can be made as the state that can not produce the discharge but be easy to generate discharge between electrode SU1 and the scan electrode SC1 with keeping.
Thus, because the discharge that produces is brought out, produce discharge between electrode SU1 and the scan electrode SC1 keeping on the zone that intersects with data electrode Dk between data electrode Dk and scan electrode SC1.Thus, in discharge cell that should be luminous, produce and write discharge, accumulate positive wall voltage at scan electrode SC1, accumulate negative wall voltage keeping electrode SU1, on data electrode Dk, also accumulate negative wall voltage.
Thus, at the 1st row, carry out in discharge cell that should be luminous, producing the write activity that writes discharge and accumulate wall voltage at each electrode.On the other hand, do not surpass discharge ionization voltage owing to apply the voltage of the data electrode 32 that writes pulse and the cross part between the scan electrode SC1, so do not produce and write discharge.
Then, apply scanning impulse to the 2nd scan electrode SC2 that carries out write activity, and to the 2nd row that carries out write activity should be luminous the corresponding data electrode Dk of discharge cell, apply and write pulse.Apply scanning impulse at the same time and write to produce in the discharge cell of pulse and write discharge, carried out write activity.
Above write activity is proceeded to the capable discharge cell of n successively, finish during writing thus.Like this, during writing, in discharge cell that should be luminous, optionally produce and write discharge, in this discharge cell, be formed on to produce during follow-up the keeping and keep the required wall electric charge of discharge.
During follow-up keeping, apply voltage 0 (V) to data electrode D1～data electrode Dm.And, to keeping electrode SU1～keep electrode SUn to apply voltage 0 (V), and apply the pulse of keeping of positive voltage Vs to scan electrode SC1～scan electrode SCn.In producing the discharge cell that writes discharge, scan electrode SCi and keep voltage difference between the electrode SUi and become and keeping the value that the wall voltage on the addition scan electrode SCi obtains with keeping the difference of the wall voltage on the electrode SUi on the voltage Vs of pulse.
Thus, scan electrode SCi and the voltage difference of keeping between the electrode SUi surpass discharge ionization voltage, scan electrode SCi with keep between the electrode SUi generation and keep discharge.And, by the ultraviolet ray by this discharge generation, make luminescent coating 35 luminous.In addition, by this discharge, accumulate negative wall voltage at scan electrode SCi, accumulate positive wall voltage keeping electrode SUi.And, on data electrode Dk, also accumulate positive wall voltage.During writing, produce can not produce in the discharge cell that writes discharge and keep discharge, the wall voltage when finishing during the maintenance initialization.
Then, apply voltage 0 (V) to scan electrode SC1～scan electrode SCn, to keeping electrode SU1～the keep pulse of keeping that electrode SUn applies voltage Vs.Produced before just in the discharge cell of keeping discharge, the voltage difference of keeping between electrode SUi and the scan electrode SCi surpasses discharge ionization voltage.Thus, keep discharge keeping between electrode SUi and the scan electrode SCi to produce again, accumulate negative wall voltage keeping electrode SUi, accumulate positive wall voltage at scan electrode SCi.
After, similarly, to scan electrode SC1～scan electrode SCn with keep the number of sustain pulses that electrode SU1～keep electrode SUn alternately is applied to the brightness multiplying power of the regulation that multiplied each other on the luminance weights.Thus, during writing, produced in the discharge cell that writes discharge to continue to produce and kept discharge.
And, produce all keeping after the pulse in during keeping, last keeping after the pulse in namely producing during keeping, to keeping electrode SU1～keep electrode SUn and data electrode D1～data electrode Dm applies voltage 0 (V), applying from rheobase to scan electrode SC1～scan electrode SCn simultaneously is the up tilt waveform voltage that voltage Vr slowly rises less than voltage 0 (V) beginning of discharge ionization voltage to the 1st assigned voltage namely.Below, should be called " up cancellation ramp voltage L3 " by up tilt waveform voltage.
Thus, in producing the discharge cell of keeping discharge, continue to produce faint discharge, under the state of the positive wall voltage on the residual data electrode Dk, cancellation scan electrode SCi and keep part or all of wall voltage on the electrode SUi.
Particularly, to keeping electrode SU1～keep electrode SUn and data electrode D1～data electrode Dm has applied under the state of voltage 0 (V), with than upward slope voltage L1 also precipitous gradient produce the up cancellation ramp voltage L3 that rises from voltage 0 (V) to voltage Vr and be applied to scan electrode SC1～scan electrode SCn.This gradient for example is about 5V/ μ sec.By voltage Vr being set at the voltage above discharge ionization voltage, thereby producing the faint discharge of generation between electrode SUi and the scan electrode SCi of keeping of the discharge cell of keeping discharge.
And, apply voltage above during also rising behind the discharge ionization voltage what apply to scan electrode SC1～scan electrode SCn, can produce this faint discharge constantly.Then, if the voltage that rises has arrived predetermined voltage Vr, then will drop to voltage 0 (V) to the voltage that applies that scan electrode SC1～scan electrode SCn applies.
In addition, in the present embodiment, voltage Vr has been set for the voltage that is lower than the voltage Vs that keeps pulse.To narrate its reason in the back.
Charged particle by this faint discharge generation is being kept on the electrode SUi and scan electrode SCi becomes the wall electric charge and accumulated, and keeps voltage difference between electrode SUi and the scan electrode SCi with mitigation.Thus, scan electrode SC1～scan electrode SCn and keep electrode SU1～the keep wall voltage between the electrode SUn and be impaired to the poor of the voltage that is applied to scan electrode SCi and discharge ionization voltage for example is impaired to about (voltage Vr-discharge ionization voltage).That is, the effect of cancellation discharge is played in the discharge that is produced by up cancellation ramp voltage L3.
Afterwards, make scan electrode SC1～scan electrode SCn revert to voltage 0 (V), keep action during finishing to keep.
During the initialization of son SF2, apply voltage 0 (V) as the 1st voltage to data electrode D1～data electrode Dm.In addition, to keeping electrode SU1～keep electrode SUn to apply voltage Ve.And, apply the descending tilt waveform voltage (descending voltage L4) that slowly descends to the negative voltage Vi4 that surpasses discharge ionization voltage from less than the voltage Vi3 ' of the discharge ionization voltage voltage 0 (V) of rheobase (for example, as) beginning to scan electrode SC1～scan electrode SCn.
The gradient of this descending voltage L4 can be identical with the gradient of descending voltage L2, as an example, for example can enumerate the such numerical value of pact-2.5V/ μ sec.
Thus, in during the keeping of preceding son (being a son SF1 among Fig. 5), producing in the discharge cell of keeping discharge, produce faint initialization and discharge.Then, the wall voltage that scan electrode SCi goes up and keeps on the electrode SUi is weakened, and the wall voltage on the data electrode Dk also is adjusted to the value that is fit to write activity.
On the other hand, not keeping in the discharge cell of discharge immediately following have to produce in during the keeping of preceding son, do not produce the initialization discharge, keep immediately following the wall electric charge during end during the initialization of preceding son field.Thus, finish initialization action among son the SF2.
Like this, the initialization action among son the SF2 becomes: only make immediately following produced during the writing of preceding son write discharge and keeping during in produced the selection initialization action that the discharge cell generation initialization of keeping discharge is discharged.Below, the period marked that will select initialization action is to select during the initialization.
During the writing of son SF2 and during keeping, to each electrode apply except the generation number of keeping pulse all with the writing of a son SF1 during and keep during identical driving voltage waveform.In addition, in later each son of son SF3, apply except the generation number of keeping pulse all identical with son SF2 driving voltage waveform to each electrode.
It more than is the summary of the 1st driving voltage waveform using and have the coding form of " can not produce the demonstration of non-luminous son more than 2 continuously with encoding " in the present embodiment, apply to each electrode of panel 10 when for example the 1st form shows image.
The figure of Fig. 6 the 2nd driving voltage waveform that to be expression apply to each electrode of the employed panel 10 of the plasma display system of embodiments of the present invention 1.
Fig. 6 represents, respectively to the scan electrode SC1 that during writing, carries out write activity at first, during writing, carry out at last write activity scan electrode SCn, keep electrode SU1～keep electrode SUn and driving voltage waveform that data electrode D1～data electrode Dm applies.
The 2nd driving voltage waveform shown in Figure 6 is the waveform shape roughly the same with the 1st driving voltage waveform shown in Figure 5.But, produce the last pulse driving voltage waveform afterwards of keeping in during the keeping of particular subfield (be in the present embodiment son SF2) and be different from the 1st driving voltage waveform.
Namely, in the 2nd driving voltage waveform, as in during the keeping of son the SF2 of particular subfield, last keeping after the pulse during generation is kept, remain unchanged to keeping the state that electrode SU1～keep electrode SUn and data electrode D1～data electrode Dm apply voltage 0 (V), produce from voltage 0 (V) beginning less than discharge ionization voltage as rheobase and impose on scan electrode SC1～scan electrode SCn to the 3rd descending tilt waveform voltage that the voltage Vi8 as the 2nd assigned voltage slowly descends.Below, the 3rd descending tilt waveform voltage is called " descending cancellation ramp voltage L8 ".
During after descending cancellation ramp voltage L8 surpasses discharge ionization voltage, also descending, in a son SF2, do not produce and write discharge, in not producing the discharge cell of keeping discharge, between scan electrode 22 and data electrode 32, produce faint discharge.And, during voltage descends, continue to produce this faint discharge applying of applying to scan electrode SC1～scan electrode SCn.Then, if arrived predetermined voltage Vi8 at the voltage that descends, make and to rise to 0 (V) to the voltage that scan electrode SC1～scan electrode SCn applies.In addition, in the present embodiment, voltage Vi8 be set equal to descending voltage L2 minimum voltage, be the voltage of voltage Vi4.
The discharging action that is produced by descending cancellation ramp voltage L8 will be narrated in the back.
Then, last during keeping, namely after scan electrode SC1～scan electrode SCn applies descending cancellation ramp voltage L8, apply with the 1st driving voltage waveform the up cancellation ramp voltage L3 that similarly slowly rises from 0 (V) to voltage Vers to scan electrode SC1～scan electrode SCn.
In the 2nd driving voltage waveform and since except during the keeping of son SF2 during driving voltage waveform identical with the 1st driving voltage waveform, so omission explanation.
It more than is the summary of the 2nd driving voltage waveform using and have the coding form of " producing the demonstrations of 2 non-luminous sons continuously with encoding " in the present embodiment, apply to each electrode of panel 10 when for example the 2nd form shows image.
Then, in the present embodiment, when explanation has " producing the demonstrations of 2 non-luminous sons continuously with encoding " in use coding form shows image, produce the 2nd driving voltage waveform, and in particular subfield (in the present embodiment be son SF2), produce last during keeping and keep the reason that applies the 3rd descending tilt waveform voltage (descending cancellation ramp voltage L8) after the pulse to scan electrode SC1～scan electrode SCn.
The present inventor has confirmed the following fact by experiment: after discharge cell is lighted in a certain son field, make the continuous son field more than 2 afterwards, this child field become non-lighting, and after son when lighting this discharge cell again, in this child field, produce sometimes " writing bad ".Should " writing bad " whether apply to this discharge cell and write pulse and can not produce the phenomenon that writes discharge.
For example, use the 2nd coding form shown in Figure 4 when panel 10 shows image, in the discharge cell of display brightness value " 9 " or brightness value " 25 ", a son SF1 is lighted, then continuous 2 son SF2, the son SF3 of a son SF1 become non-lighting, and a son SF4 is afterwards lighted again.Therefore, might in the SF4 of this child field, produce write bad.
Think that this is to cause because of following reason.In addition, below, illustrate the discharge cell that uses the 2nd coding form display brightness value " 9 ".
In using the discharge cell of the 2nd coding form display brightness value " 9 ", in a son SF1, produce keep discharge after, during the writing of a son SF2, do not apply to data electrode 32 and write pulse.But, owing to apply scanning impulse to scan electrode 22, therefore also apply scanning impulse to this discharge cell.
And, think in this discharge cell, to produce electric field by applying scanning impulse that wall electric charge or triggering particle move to this discharge cell from the discharge cell of periphery gradually.This wall electric charge or trigger in the easier discharge cell that has advanced miniaturization in the high-finenessization that is accompanied by panel 10 of the useless movement of particle produces.
Though these wall electric charges or triggering particle amount and few, owing in discharge cell, can accumulate these wall electric charges or triggering particle, so this discharge cell can become the state that is difficult for producing discharge.And its result during the keeping of son SF2, is applying the 1st when keeping pulse to scan electrode 22, can produce useless faint discharge sometimes in this discharge cell.
In the discharge cell that has produced useless faint discharge, can accumulate charged particle by this faint discharge generation relaxing the voltage difference between scan electrode 22 and the data electrode 32 at scan electrode 22 and data electrode 32, and can form the wall voltage of bearing at scan electrode 22.
But because this discharge is faint, therefore can not generate is enough to produce the 2nd the later wall electric charge of keeping discharge and triggers particle.Therefore, if do not produce descending cancellation ramp voltage L8, then in this discharge cell, the initialization discharge that connects during discharge that capable cancellation ramp voltage L3 causes and the follow-up initialization can not produce.
In this discharge cell, a follow-up son SF3 also is in non-lighting.Therefore, during the writing of son SF3, can not apply to this discharge cell and write pulse.But, exist in this discharge cell by keeping useless wall electric charge and the useless triggering particle that useless faint discharge that pulse produces generates by the 1st during the keeping of a son SF2.Therefore, in this discharge cell, by applying scanning impulse, can produce useless faint discharge again.And, think wall electric charge in this useless faint this discharge cell of discharge meeting cancellation.
In addition, in this discharge cell, though during the writing of son SF3, can produce above-mentioned useless faint discharge, but can not carry out write activity, therefore can not produce the common discharge that writes, so can not produce during follow-up keeping and keep discharge, the cancellation discharge that up cancellation ramp voltage L3 causes can not produce yet, and the initialization discharge during the follow-up selection initialization can not produce yet.Therefore, in this discharge cell, because of useless faint discharge cancellation wall electric charge and the state that triggers particle after during the initialization of a follow-up son SF4, also can continue to exist.
Therefore, in this discharge cell, during the writing of son SF4, become the required wall electric charge of write activity and trigger the state of particle deficiency, write pulse and scanning impulse even apply, in this discharge cell, also can not produce and write discharge.Thus, think that the meeting generation write bad in a son SF4 that should be lighted.
And, if in case write bad, then after till carrying out whole unit initialization action, the wall electric charge that write activity is required and the state that triggers the particle deficiency can continue to exist, and write the bad generation that also can continue.
More than be in 1 in case 1 son field is lighted and then the continuous son field more than 2 of this child field become non-lighting, after son in when carrying out be used to the write activity lighted again, generation writes bad reason in this discharge cell.
For prevent this write bad, as long as eliminate above-mentioned " by keeping useless wall electric charge and the useless triggering particle that useless faint discharge that pulse produces generates by the 1st ".
Therefore, in the present embodiment, after in case the son field is lighted, when producing the existing continuous non-son of lighting more than 2 after son the discharge cell of being lighted again the time, namely, in form, exist to have and thisly light, during the coding of non-combination of lighting, the time in the continuous non-son of lighting more than 2 gone up the son field that produces earlier be made as particular subfield.
In above-mentioned example, when using the 2nd form to show image, might a son SF2 and a son SF3 become " 2 continuous non-son fields of lighting ".Therefore, when use the 2nd table driving panel 10, with the time is gone up the son field of elder generation's generation in 2 continuous non-son fields of lighting, namely a son field SF2 is made as particular subfield.
And, in particular subfield (being a son SF2 in the example shown in the present embodiment), during keeping, produce last keeping after the pulse, to apply the state of voltage 0 (V) constant to keeping electrode SU1～keep electrode SUn and data electrode D1～data electrode Dm in maintenance, produces from as the 3rd descending tilt waveform voltage (descending cancellation ramp voltage L8) that slowly descends to the voltage Vi8 as the 2nd assigned voltage less than voltage 0 (V) beginning of discharge ionization voltage of rheobase and impose on scan electrode SC1～scan electrode SCn.
Then, the discharging action that is produced by descending cancellation ramp voltage L8 is described.In particular subfield, as mentioned above, the scan electrode 22 that might produce the discharge cell of useless faint discharge under " keeping pulse for the 1st " forms negative wall voltage.Therefore, by applying descending cancellation ramp voltage L8 to scan electrode SC1～scan electrode SCn, thereby can in having formed the discharge cell of negative wall voltage, scan electrode 22 produce discharge because of useless wall electric charge.
The charged particle that produces by the discharge that is caused by descending cancellation ramp voltage L8 be accumulated on the scan electrode 22 and data electrode 32 on to relax the voltage difference between scan electrode 22 and the data electrode 32, in the positive wall voltage of scan electrode 22 formation.
Its result in the discharge cell that has produced discharge based on descending cancellation ramp voltage L8, to the up cancellation ramp voltage L3 that scan electrode SC1～scan electrode SCn applies, can produce the cancellation discharge based on following descending cancellation ramp voltage L8.Thus, during follow-up selection initialization, also can produce the initialization discharge.Therefore, in this discharge cell, cancellation is accumulated in inner useless wall electric charge, this discharge cell can be made as the state of normal wall electric charge.
Thus, during it writes, can prevent from producing useless faint discharge because of useless wall electric charge.In above-mentioned example, can prevent the generation of the useless faint discharge during the writing of son SF3.
Therefore, can normally carry out write activity in the son field that should light after this child field, can in this child field, normally light discharge cell.In above-mentioned example, normally produce in during the writing of son SF4 and write discharge, a son SF4 is normally lighted.
Like this, in the present embodiment, under the situation that has the possibility that produces continuous non-some transom field more than 2, the time among continuous non-sub of lighting more than 2 is gone up the sub-field that produces earlier be made as particular subfield.And, in particular subfield, produce last the keeping after the pulse during keeping, apply descending cancellation ramp voltage L8 to scan electrode SC1～scan electrode SCn.
Thus, after a certain son has been lighted discharge cell, then the continuous son more than 2 of this child field become non-lighting and after the son field in when lighting this discharge cell again, writing of can preventing from producing in this child field is bad.Therefore, can prevent the deterioration of the image display quality in the plasma display system.
In addition, in the 1st form shown in the present embodiment, owing to there is not the possibility that produces the continuous non-son field of lighting more than 2, therefore do not exist to produce the above-mentioned bad possibility that writes.Therefore, in the present embodiment, when using the form (being the 1st form in the above-mentioned example) that does not have continuous non-sub the possibility of lighting more than 2 when driving panel 10, particular subfield is not set, produces each electrode that the 1st driving voltage waveform that descending cancellation ramp voltage L8 can not take place is applied to panel 10.
In addition, descending cancellation ramp voltage L8 causes the follow-up discharge that writes to become unstable because the adjustment of wall electric charge is not enough when minimum voltage (voltage Vi8) is too high.In addition, cross when low at minimum voltage (voltage Vi8), be adjusted to the wall charge excess and cause the follow-up discharge that writes to become unstable.These situations are all confirmed by the present inventor.
And, confirm preferably the minimum voltage (voltage Vi8) of descending cancellation ramp voltage L8 is set in respect to the minimum voltage (voltage Vi4) of descending voltage L2+5 (V) are to the scope of-5 (V).For example, if voltage Vi4 is-175 (V), then preferably at the scope setting voltage Vi8 of-170 (V) to-180 (V).Thus, in the present embodiment, set voltage Vi8 for the voltage identical with voltage Vi4 (for example-175 (V)).
In addition, the size of the voltage that applies to each electrode in the present embodiment for example is voltage Vi1=150 (V), voltage Vi2=350 (V), voltage Vi3=215 (V), voltage Vi3 '=0 (V), voltage Vi4=-175 (V), voltage Vi8=-175 (V), voltage Vc=-50 (V), voltage Va=-200 (V), voltage Vs=215 (V), voltage Vr=200 (V), voltage Ve=170 (V), voltage Vd=60 (V).But these magnitudes of voltage are nothing but an example of enumerating in the embodiment.Each magnitude of voltage is not limited to above-mentioned value, preferably waits to be set at optimum value according to the characteristic of panel 10 or the specification of plasma display system.
Then, illustrate the arrival current potential of up cancellation ramp voltage L3, be that voltage Vr sets the reason less than the voltage of the voltage Vs that keeps pulse for.
Fig. 7 is the figure of the relation of the expression voltage Vr of embodiments of the present invention 1 and the voltage difference between the voltage difference between the voltage Vs and voltage Vi4 and the voltage Va.
In addition, below, the voltage difference between voltage Vi4 and the voltage Va is labeled as voltage Vset2.That is voltage Vi4=voltage Va+ voltage Vset2.
In Fig. 7, transverse axis represent between voltage Vr and the voltage Vs voltage difference, be voltage Vr-voltage Vs, the longitudinal axis represent between voltage Vi4 and the voltage Va voltage difference, be voltage Vi4-voltage Va (voltage Vset2).
In Fig. 7, the curve table of representing with circle is shown in the upper limit that can stably produce the voltage Vset2 that writes discharge during follow-up the writing.If voltage Vset2 is set at voltage above this upper limit, then during follow-up writing, produces the possibility that misplaces electricity and uprise.Even this misplaces electricity is also can not produce the phenomenon that writes discharge in applying the discharge cell (only applying the discharge cell of scanning impulse) that writes pulse.
In addition, in Fig. 7, the curve table of representing with triangle is shown in the lower limit that can stably produce the voltage Vset2 that writes discharge during follow-up the writing.If voltage Vset2 is set at voltage less than this lower limit, then during follow-up writing, can be created in to apply not produce in the discharge cell that writes pulse and writes the so bad possibility that writes of discharge and uprise.
Therefore, the difference of this upper limit and lower limit is more big, more can stably carry out write activity during follow-up writing.
In addition, curve shown in Figure 7 has been represented: be set at voltage Vs=215 (V), voltage Va=-200 (V), when voltage Vr is changed to voltage Vs-30 (V) with the interval of per 5 (V) from voltage Vs+5 (V) voltage Vset2 be made as that variable back confirms that the such order of generation of discharge experimentizes and the result that obtains.
And as shown in Figure 7, when voltage Vr-voltage Vs was voltage 0 (V), namely during voltage Vr=voltage Vs, the upper limit of voltage Vset2 (about 83.5 (V)) was about 7 (V) with the difference of lower limit (about 76.5 (V)).
In addition, when voltage Vr-voltage Vs was-5 (V), namely during voltage Vr=voltage Vs-5 (V), the upper limit of voltage Vset2 (about 84.1 (V)) was about 8.1 (V) with the difference of lower limit (about 76 (V)).
In addition, when voltage Vr-voltage Vs was-10 (V), namely during voltage Vr=voltage Vs-10 (V), the upper limit of voltage Vset2 (about 85.2 (V)) was about 9.7 (V) with the difference of lower limit (about 75.5 (V)).
In addition, when voltage Vr-voltage Vs was-15 (V), namely during voltage Vr=voltage Vs-15 (V), the upper limit of voltage Vset2 (about 85.5 (V)) was about 11.5 (V) with the difference of lower limit (about 74 (V)).
In addition, when voltage Vr-voltage Vs was-20 (V), namely during voltage Vr=voltage Vs-20 (V), the upper limit of voltage Vset2 (about 85.2 (V)) was about 11.7 (V) with the difference of lower limit (about 73.5 (V)).
In addition, when voltage Vr-voltage Vs was-25 (V), namely during voltage Vr=voltage Vs-25 (V), the upper limit of voltage Vset2 (about 85.5 (V)) was about 12.5 (V) with the difference of lower limit (about 73 (V)).
In addition, when voltage Vr-voltage Vs was-30 (V), namely during voltage Vr=voltage Vs-30 (V), the upper limit of voltage Vset2 (about 85.4 (V)) was about 12.4 (V) with the difference of lower limit (about 73 (V)).
Thus, from results verification shown in Figure 7 to, by voltage Vr being set for the voltage that is lower than voltage Vs, thereby also big when making the upper limit that during follow-up writing, can stably produce the voltage Vset2 that writes discharge set the voltage that equals voltage Vs with the difference of lower limit for than with voltage Vr, can make write activity stable.
Think this be because: by voltage Vr being set for the voltage that is lower than voltage Vs, thereby compare when setting voltage Vr for equal voltage Vs voltage, can shorten the duration of cancellation discharge, therefore more residual by the wall electric charge of keeping discharge generation, its result especially can make at scan electrode 22 and keeps between the electrode 23 discharge stability that produces.
Thus, in the present embodiment, voltage Vr can be set at the low voltage also than voltage Vs.
Wherein, confirmed to be-35 (V) when following at voltage Vr-voltage Vs that soon voltage Vr is made as voltage Vs-35 (V) when following, during its follow-up keeping, the possibility that also can continue to keep discharge in not applying the discharge cell that writes pulse uprises.Think this be because: owing to too reduce voltage Vr, so the cancellation discharge is not enough, so wall electric charge and the residual volume that triggers particle become excessive.
Like this, confirmed if too reduce voltage Vr, then might during follow-up keeping, produce and misplace.Therefore, in the present embodiment, voltage Vr is set at is lower than voltage Vs and can during follow-up keeping, do not produce the voltage that misplaces electricity.
Particularly, in the present embodiment, based on characteristic shown in Figure 7, at voltage Vs-5 (V) setting voltage Vr to the scope of voltage Vs-30 (V).For example, be set at voltage Vs=215 (V), voltage Vr=200 (V).
Wherein, these magnitudes of voltage are nothing but an example of embodiment.Each magnitude of voltage is not limited to above-mentioned value, preferably according to the characteristic of panel 10 or the specification of plasma display system etc., is set at optimum value.
The formation of the plasma display system of present embodiment then, is described.In addition, in the following description, will make the action mark of on-off element conducting be " connection ", the action mark that on-off element is ended is " disconnection ".
Fig. 8 is the circuit block diagram of the plasma display system 40 of embodiments of the present invention 1.
Plasma display system 40 possesses panel 10 and drives the driving circuit of panel 10.Driving circuit possesses imaging signal processing circuit 41, data electrode driver circuit 42, scan electrode driving circuit 43, keep electrode drive circuit 44, timing generation circuit 45 and supply with the power circuit (not shown) of the required power supply of each circuit block.
Imaging signal processing circuit 41 distributes gray-scale value based on the picture signal of input to each discharge cell.Then, this gray-scale value is transformed to luminous, non-luminous view data of each son field of expression.
For example, when the picture signal sig of input comprises R signal, G signal, B signal, based on this R signal, G signal, B signal, distribute each gray-scale value (by 1 gray-scale value that shows) of R, G, B to each discharge cell.Perhaps, when the picture signal sig of input comprises luminance signal (Y-signal) and chroma signal (C signal or R-Y signal and B-Y signal or u signal and v signal etc.), calculate R signal, G signal, B signal based on this luminance signal and chroma signal, distribute each gray-scale value of R, G, B afterwards to each discharge cell.Then, the gray-scale value of distributing to R, G, the B of each discharge cell is transformed to luminous, non-luminous view data of each son of expression.
Timing generation circuit 45 produces the various timing signals of the action of each circuit block of control based on horizontal-drive signal and vertical synchronizing signal.Then, the timing signal that produces is offered each circuit block (imaging signal processing circuit 41, data electrode driver circuit 42, scan electrode driving circuit 43 and keep electrode drive circuit 44 etc.).
Scan electrode driving circuit 43 possesses waveform of initialization to be produced circuit, keeps pulse-generating circuit and scanning impulse generation circuit (not shown).Waveform of initialization produces circuit and is created in the waveform of initialization that imposes on scan electrode SC1～scan electrode SCn during the initialization.Keep pulse-generating circuit and be created in the pulse of keeping that imposes on scan electrode SC1～scan electrode SCn during keeping.Scanning impulse produces circuit and possesses a plurality of scan electrode drive IC (scans I C), is created in the scanning impulse that imposes on scan electrode SC1～scan electrode SCn during writing.And scan electrode driving circuit 43 is distinguished driven sweep electrode SC1～scan electrode SCn based on the timing signal of supplying with from timing generation circuit 45.
Data electrode driver circuit 42 is transformed to the write pulse corresponding with each data electrode D1～data electrode Dm with the data of each son field of composing images data.Then, based on the timing signal of supplying with from timing generation circuit 45, apply to each data electrode D1～data electrode Dm and to write pulse.
Keep electrode drive circuit 44 and possess the circuit (not shown) of keeping pulse-generating circuit and producing voltage Ve, drive based on the timing signal of supplying with from timing generation circuit 45 and keep electrode SU1～keep electrode SUn.
Fig. 9 is the circuit diagram of structure of scan electrode driving circuit 43 that schematically shows the plasma display system 40 of embodiments of the present invention 1.
Scan electrode driving circuit 43 possesses the pulse-generating circuit of keeping 50, tilt waveform voltage generation circuit 60 and scanning impulse and produces circuit 70.In addition, each circuit block has omitted the details in the path of timing signal based on the timing signal work of supplying with from timing generation circuit 45 in Fig. 9.In addition, the voltage that is input in the scanning impulse generation circuit 70 is labeled as " reference potential A ".
Keep pulse-generating circuit 50 and possess power recovery circuit 51, on-off element Q55, on-off element Q56 and on-off element Q59.Power recovery circuit 51 possesses capacitor C10, on-off element Q11, on-off element Q12, the adverse current that power recovery uses and prevents diode Di11, the diode Di12 of usefulness, inductor L11, the inductor L12 that resonance is used.
Power recovery circuit 51 makes the interelectrode capacitance of panel 10 and inductor L12 produce LC resonance, thereby reclaims the electric power that is accumulated in the panel 10 and it is accumulated among the capacitor C10 from panel 10.And the interelectrode capacitance by making panel 10 and inductor L11 produce LC resonance the electric power that reclaims are offered panel 10 again from capacitor C10, and the electric power during as driven sweep electrode SC1～scan electrode SCn utilizes again.
On-off element Q55 is clamped at scan electrode SC1～scan electrode SCn on the voltage Vs, and on-off element Q56 is clamped at scan electrode SC1～scan electrode SCn on the voltage 0 (V).On-off element Q59 is separating switch, prevents electric current via the parasitic diode of the on-off element that constitutes scan electrode driving circuit 43 etc. and adverse current.
Thus, keep the pulse of keeping that pulse-generating circuit 50 produces the voltage Vs that applies to scan electrode SC1～scan electrode SCn.
Scanning impulse produces the power supply E71 that circuit 70 possesses the power supply of on-off element Q71H1～on-off element Q71Hn, on-off element Q71L1～on-off element Q71Ln, on-off element Q72, generation negative voltage Va and produces voltage Vp.And superimposed voltage Vp produces voltage Vc (Vc=Va+Vp) on the reference potential A of scanning impulse generation circuit 70, imposes on scan electrode SC1～scan electrode SCn in the time of switched voltage Va and voltage Vc, thereby produces scanning impulse.For example, if voltage Va=-200 (V), voltage Vp=150 (V), then voltage Vc=-50 (V).
And scanning impulse produces circuit 70 and applies scanning impulse in Fig. 5, moment shown in Figure 6 each scan electrode in scan electrode SC1～scan electrode SCn successively.In addition, scanning impulse produces circuit 70 and directly exports the output voltage of keeping pulse-generating circuit 50 in during keeping.That is, to the voltage of scan electrode SC1～scan electrode SCn output as reference potential A.
Tilt waveform voltage generation circuit 60 possesses Miller integrating circuit 61, Miller integrating circuit 62 and Miller integrating circuit 63, produces as Fig. 5, tilt waveform voltage shown in Figure 6.
Miller integrating circuit 61 possesses transistor Q61, capacitor C61 and resistance R 61.And, by applying constant voltage (providing constant voltage difference as input terminal IN61 between illustrated 2 circles) to input terminal IN61, thereby produce the up tilt waveform voltage that slowly rises to voltage Vt.
In addition, in the present embodiment, voltage Vi2 is configured to equal the superposeed voltage of voltage Vp at voltage Vt.Namely, when making Miller integrating circuit 61 work, cut-off switch element Q72 and on-off element Q71L1～on-off element Q71Ln, and connect on-off element Q71H1～on-off element Q71Hn, at the voltage Vp of the up tilt waveform voltage stack power supply E71 that is produced by Miller integrating circuit 61, thereby produce upward slope voltage L1.
Miller integrating circuit 62 possesses transistor Q62, capacitor C62, resistance R 62 and adverse current and prevents from using diode Di62.And, by applying constant voltage (providing constant voltage difference as input terminal IN62 between illustrated 2 circles) to input terminal IN62, thereby produce the up tilt waveform voltage (up cancellation ramp voltage L3) that slowly rises to voltage Vr.
Miller integrating circuit 63 possesses transistor Q63, capacitor C63 and resistance R 63.And, by applying constant voltage (providing constant voltage difference as input terminal IN63 between illustrated 2 circles) to input terminal IN63, thereby produce the descending tilt waveform voltage (descending voltage L2, descending voltage L4) that slowly descends to voltage Vi4.
In addition, on-off element Q69 is separating switch, prevents electric current via the parasitic diode of the on-off element that constitutes scan electrode driving circuit 43 etc. and adverse current.
In addition, these on-off elements and transistor can use general known semiconductor elements such as MOSFET or IGBT to constitute.In addition, timing signal control these on-off elements and the transistor corresponding with each on-off element and transistor by being produced by timing generation circuit 45.
Figure 10 is the circuit diagram of the structure of keeping electrode drive circuit 44 that schematically shows the plasma display system 40 of embodiments of the present invention 1.
Keep electrode drive circuit 44 and possess the pulse-generating circuit of keeping 80 and constant voltage generation circuit 85.In addition, each circuit block has omitted the details in the path of timing signal based on the timing signal work of supplying with from timing generation circuit 45 among Figure 10.
Keep pulse-generating circuit 80 and possess power recovery circuit 81, on-off element Q83 and on-off element Q84.Power recovery circuit 81 possesses capacitor C20, on-off element Q21, on-off element Q22, the adverse current that power recovery uses and prevents diode Di21, the diode Di22 of usefulness, inductor L21, the inductor L22 that resonance is used.
Power recovery circuit 81 makes the interelectrode capacitance of panel 10 and inductor L22 produce LC resonance, reclaims the electric power that is accumulated in the panel 10 and it is accumulated among the capacitor C20 from panel 10.Then, make the interelectrode capacitance of panel 10 and inductor L21 produce LC resonance, supply with the electric power that reclaims to panel 10 again from capacitor C20, the electric power of keeping electrode SU1～when keeping electrode SUn as driving utilizes again.
On-off element Q83 will keep electrode SU1～keep electrode SUn to be clamped on the voltage Vs, and on-off element Q84 will keep electrode SU1～keep electrode SUn to be clamped on the voltage 0 (V).
Thus, keep the pulse of keeping that pulse-generating circuit 80 produces the voltage Vs that applies to scan electrode SC1～scan electrode SCn.
Constant voltage produces circuit 85 and possesses on-off element Q86 and on-off element Q87.And, to keeping electrode SU1～keep electrode SUn to apply voltage Ve.
In addition, these on-off elements can use general known elements such as MOSFET or IGBT to constitute.In addition, control these on-off elements by the timing signal corresponding with each on-off element that is produced by timing generation circuit 45.
Figure 11 is the circuit diagram of structure that schematically shows the plasma display system 40d data electrode driver circuit 42 of embodiments of the present invention 1.
In addition, data electrode driver circuit 42 based on the view data of supplying with from imaging signal processing circuit 41, and from the timing signal work that timing generation circuit 45 is supplied with, in Figure 11, omitted the details in the path of these signals.
Data electrode driver circuit 42 possesses on-off element Q91H1～on-off element Q91Hm, on-off element Q91L1～on-off element Q91Lm.And, apply voltage 0 (V) by connecting on-off element Q91Lj to data electrode Dj, apply voltage Vd by connecting on-off element Q91Hj to data electrode Dj.
As previously discussed, in the present embodiment, do not produce using " the continuous non-son of lighting more than 2 " form, for example the 1st form comes to produce each electrode that the 1st driving voltage waveform shown in Figure 5 imposes on panel 10 when panel 10 shows images, drives panel 10 thus.
In addition, exist in case produce the continuous non-son of lighting more than 2 after putting the transom field and be created in after the son field in during the possibility of the discharge cell lighted again, namely, in form, exist have thisly light, during the coding of non-combination of lighting, when this form of use, when for example the 2nd form comes at panel 10 demonstration images, produce each electrode that the 2nd driving voltage waveform shown in Figure 6 imposes on panel 10, drive panel 10 thus.
That is, with the time upward is made as particular subfield in the sub-field of generation earlier among non-sub of lighting more than 2 afterwards, continuous in case sub is lighted.And, in particular subfield, last keeping after the pulse during generation is kept produces from voltage 0 (V) beginning as rheobase and imposes on scan electrode SC1～scan electrode SCn to the 3rd descending tilt waveform voltage (descending cancellation ramp voltage L8) that the voltage Vi8 as the 2nd assigned voltage slowly descends.
Thus, after discharge cell is lighted in a certain son field, then the continuous son field more than 2 of this child field becomes non-lighting, after son when lighting this discharge cell again, writing of can preventing from producing in this child field is bad, can prevent the deterioration of the image display quality of plasma display system.
In addition, last keeping after the pulse during generation is kept, to apply the state of voltage 0 (V) constant to keeping electrode SU1～keep electrode SUn and data electrode D1～data electrode Dm in maintenance, applies the up tilt waveform voltage (up cancellation ramp voltage L3) that slowly rises to the voltage Vr as the 1st assigned voltage from less than voltage 0 (V) beginning of discharge ionization voltage to scan electrode SC1～scan electrode SCn.And, voltage Vr is set at can not produce the voltage that misplaces electricity less than voltage Vs and during follow-up writing.Thus, when the panel 10 of the big picture that drives high-fineness, also can carry out stable write activity, can be on panel 10 the high image of display quality.
(embodiment 2)
Illustrated that in embodiment 1 number of times that will carry out whole unit initialization action is made as the example that drives panel 10 for 1 time in 1.But the present invention is not limited to these formations.For example, the number of times that also goes for carrying out whole unit initialization action is made as the formation that drives panel 10 for 1 time in a plurality of, at this moment, also can access effect same as described above.
In the number of times that will carry out whole unit initialization action is made as 1 time driving method in a plurality of, compare with the formation of in 1, carrying out 1 whole unit initialization action, can reduce follow whole unit initialization action and produce luminous, shiny black degree (not producing the brightness of the gray scale of keeping discharge) can be reduced, the contrast of the image that shows at panel 10 can be improved thus.
Below, the number of times that explanation will be carried out whole unit initialization action is made as the example that drives panel 10 for 1 time in 3.
The figure of Figure 12 the 1st driving voltage waveform that to be expression apply to each electrode of the employed panel 10 of the plasma display system of embodiments of the present invention 2.
Figure 12 represent to the scan electrode SC1 that during writing, carries out write activity at first, during writing the 2nd scan electrode SC2 that carries out write activity, keep electrode SU1～keep electrode SUn, and driving voltage waveform that data electrode D1～data electrode Dm applies respectively.
In the present embodiment, there is the 1st seed field of forcing the discharge cell of initialization action and not forcing the discharge cell of initialization action in a son SF1.In addition, the extremely sub SF5 of a son SF2 is the 2nd seed field of selecting initialization action in all discharge cells.
Forcing initialization action to be and the initialization action of closelying follow in the preceding son field of mandatory generation initialization discharge in discharge cell irrespectively that has or not that writes discharge (keeping discharge) generation, is the initialization action identical with the whole unit initialization action that illustrated in embodiment 1.Therefore, equal during whole unit initialization to whole unit waveform of initialization that each electrode applies by the driving voltage waveform of forcing initialization action to apply to each electrode.
In addition, Figure 12 represents: during the initialization of son SF1, force initialization action in the discharge cell on being formed at scan electrode SC1, be formed at and do not forcing initialization action in the discharge cell on the scan electrode SC2 but driving voltage waveform when selecting initialization action.
As the first half during the initialization of son the SF1 of the 1st seed field, apply voltage 0 (V) to data electrode D1～data electrode Dm, also apply voltage 0 (V) to keeping electrode SU1～SUn.And, apply the driving voltage waveform of the waveform shape identical with the whole unit waveform of initialization shown in the embodiment 1 to the scan electrode SC1 that forces initialization action.
Thus, in the discharge cell on being formed at scan electrode SC1, carry out the initialization action identical with the whole unit initialization action shown in the embodiment 1, and discharge immediately following the generation initialization that has or not irrespectively in discharge cell that writes that discharge (keeping discharge) produces in the preceding son.
On the other hand, to the scan electrode SC2 that forces initialization action, apply the up tilt waveform voltage (upward slope voltage L5) that slowly rises to the voltage Vi5 that is lower than voltage Vi2 from voltage 0 (V) beginning.By voltage Vi5 being set at the voltage less than discharge ionization voltage, thereby in the discharge cell on being formed at scan electrode SC2, do not produce the initialization discharge.
Like this, first half during the initialization of a son SF1, to the scan electrode 22 of forcing initialization action (for example scan electrode SC1), apply to irrespectively producing the slow up tilt waveform voltage (upward slope voltage L1) that rises of the voltage Vi2 that discharges with the having or not of discharge (keeping discharge) generation that write of closelying follow in preceding sub.In addition, apply the up tilt waveform voltage (upward slope voltage L5) that slowly rises to the voltage Vi5 that is lower than voltage Vi2 to the scan electrode 22 of not forcing initialization action (for example scan electrode SC2).
Latter half during the initialization of son SF1, to each electrode apply with the whole unit initialization shown in the embodiment 1 during the driving voltage waveform of the identical waveform shape of latter half.At this moment, the driving voltage waveform that applies to the scan electrode 22 of forcing initialization action is identical waveform shape with the driving voltage waveform that applies to the scan electrode 22 of not forcing initialization action.
Thus, in the discharge cell that carried out forcing initialization action (for example, be formed on the scan electrode SC1 discharge cell), produce faint initialization discharge.
On the other hand, at the discharge cell of forcing initialization action (for example, be formed on the discharge cell on the scan electrode SC2) in, have only immediately following preceding son, namely in the final son (a for example son SF5) immediately following preceding field, produced the faint initialization of discharge cell generation that writes discharge (keeping discharge) and discharge.In immediately following preceding son field, produce and do not produce the initialization discharge in the discharge cell that writes discharge (keeping discharge), the wall voltage before keeping.
Therefore, the initialization action of carrying out in forcing the discharge cell of initialization action becomes the selection initialization action.
Thus, in the 1st seed field (a son SF1), during initialization, mix and have the discharge cell of forcing initialization action and the discharge cell of selecting initialization action.
And, apply waveform of initialization with whole unit waveform of initialization same waveform as shape to the scan electrode 22 of the discharge cell of forcing initialization action.That is, the scan electrode 22 to the discharge cell of forcing initialization action applies upward slope voltage L1 and descending voltage L2.Upward slope voltage L1 is: rise to and the up tilt waveform voltage that has or not the voltage Vi2 that irrespectively the generation initialization is discharged in discharge cell of closelying follow the generation that writes discharge (keeping discharge) in the preceding son field.Descending voltage L2 is the descending tilt waveform voltage that drops to the voltage Vi4 that produces discharge.
In addition, the scan electrode 22 to the discharge cell of forcing initialization action applies upward slope voltage L5 and descending voltage L2.Upward slope voltage L5 is: rise to the up tilt waveform voltage that is lower than voltage Vi2 and does not produce the voltage Vi5 of initialization discharge in discharge cell.Descending voltage L2 is the descending tilt waveform voltage that drops to voltage Vi4.
Below, will force the period marked of initialization action to be " during the pressure initialization ".In addition, the driving voltage waveform that will produce in order to force initialization action is labeled as " pressure waveform of initialization ".
During the writing of a follow-up son SF1 and the action in during keeping identical with embodiment 1.
Namely, last keeping after the pulse during generation is kept, to apply the state of voltage 0 (V) constant to keeping electrode SU1～keep electrode SUn and data electrode D1～data electrode Dm in maintenance, applies the up tilt waveform voltage (up cancellation ramp voltage L3) that slowly rises to the voltage Vr as the 1st assigned voltage from the voltage 0 (V) less than discharge ionization voltage to scan electrode SC1～scan electrode SCn.And, voltage Vr is set at is lower than voltage Vs and can during follow-up writing, do not produce the voltage that misplaces electricity.
It is in the 2nd seed field of selecting initialization action during the initialization in discharge cell that a son SF2 of initial beggar field is selected in follow-up conduct.
(during selecting initialization) during the initialization of son SF2, also can be to the driving voltage waveform of the identical waveform shape of the driving voltage waveform that illustrates in each electrode applies during the selection initialization with embodiment 1.But, also the minimum voltage that imposes on the descending tilt waveform voltage of scan electrode SC1～scan electrode SCn can be set at the voltage Vi4 that is higher than as the minimum voltage of descending voltage L2.
The example that is described as follows in the present embodiment: during selecting initialization, the minimum voltage of the descending tilt waveform voltage that will apply to scan electrode SC1～scan electrode SCn is made as the magnitude of voltage voltage Vi6 higher than voltage Vi4, applies the 2nd descending tilt waveform voltage (hereinafter referred to as " descending voltage L6 ") that drops to voltage Vi6 from voltage Vi3 ' to scan electrode SC1～scan electrode SCn.
During the initialization of son SF2, to keeping electrode SU1～keep electrode SUn to apply the magnitude of voltage voltage Vh higher than voltage Ve.Apply the descending tilt waveform voltage (descending voltage L6) that slowly descends to the negative voltage Vi6 that surpasses discharge ionization voltage from the voltage Vi3 ' (for example voltage 0 (V)) less than discharge ionization voltage to scan electrode SC1～scan electrode SCn.
The gradient of this descending voltage L6 also can be identical with the gradient of descending voltage L2, as the one example, for example can enumerate the such numerical value of pact-2.5V/ μ sec.
And, apply to scan electrode SC1～scan electrode SCn descending voltage L6 during, apply magnitude of voltage 2nd voltage (positive voltage Vg) higher than the 1st voltage (voltage 0 (V)) to data electrode D1～data electrode Dm.
As mentioned above, voltage Vi6 as the minimum voltage of descending voltage L6 is set to the voltage Vi4 height that likens to the minimum voltage of descending voltage L2, and only immediately following producing the voltage that the discharge cell generation that writes discharge (keeping discharge) is discharged in the preceding son.At this moment, the differential voltage (imposing on the voltage of discharge cell) that preferably voltage Vi6 is set at voltage Vg and voltage Vi6 becomes the voltage with voltage Vi4 same degree.
During the writing of a follow-up son SF2 and the 1st driving voltage waveform shown in Fig. 5 of the action in during keeping and embodiment 1 identical.
Namely, last keeping after the pulse during generation is kept, to apply the state of voltage 0 (V) constant to keeping electrode SU1～keep electrode SUn and data electrode D1～data electrode Dm in maintenance, applies the up tilt waveform voltage (up cancellation ramp voltage L3) that slowly rises to the voltage Vr as the 1st assigned voltage from the voltage 0 (V) less than discharge ionization voltage to scan electrode SC1～scan electrode SCn.And, voltage Vr is set at is lower than voltage Vs and during follow-up writing, can not produce the voltage that misplaces electricity.
In addition, at later each son of son SF3, apply except the generation number of keeping pulse all identical with son field SF2 driving voltage waveform to each electrode.
More than, be the summary of the 1st driving voltage waveform that applies to each electrode of panel 10 when using and have the coding form of " demonstration that can not produce the non-luminous son more than 2 continuously with coding ", the 1st form demonstration image shown in for example embodiment 1 in the present embodiment.
The figure of Figure 13 the 2nd driving voltage waveform that to be expression apply to each electrode of the employed panel 10 of the plasma display system of embodiments of the present invention 2.
Figure 13 illustrates: respectively to the scan electrode SC1 that during writing, carries out write activity at first, during writing the 2nd scan electrode SC2 that carries out write activity, keep electrode SU1～keep electrode SUn, and driving voltage waveform that data electrode D1～data electrode Dm applies.
The 2nd driving voltage waveform shown in Figure 13 is the waveform shape roughly the same with the 1st driving voltage waveform shown in Figure 12.But, during the keeping of particular subfield (be in the present embodiment son SF2), produce the last driving voltage waveform of keeping after the pulse and be different from the 1st driving voltage waveform.
Namely, identical with the 2nd driving voltage waveform shown in Figure 6 of embodiment 1, in the 2nd driving voltage waveform of present embodiment, as during the keeping of son the SF2 of particular subfield, produce last keeping after the pulse, to apply the state of voltage 0 (V) constant to keeping electrode SU1～keep electrode SUn and data electrode D1～data electrode Dm in maintenance, produces from rheobase and namely impose on scan electrode SC1～scan electrode SCn less than the voltage 0 (V) of discharge ionization voltage to the 3rd descending tilt waveform voltage (descending cancellation ramp voltage L8) that the voltage Vi8 as the 2nd assigned voltage slowly descends.
The summary of the 2nd driving voltage waveform that applies to each electrode of panel 10 when more than being as shown in Embodiment 1 the 2nd form demonstration image of the coding form that uses and have " demonstrations that produce 2 non-luminous sons continuously with coding " in the present embodiment, example.
In addition, the size of the voltage that applies to each electrode is in the present embodiment, for example voltage Vi1=150 (V), voltage Vi2=350 (V), voltage Vi3=215 (V), voltage Vi3 '=0 (V), voltage Vi4=-175 (V), voltage Vi8=-175 (V), voltage Vi5=200 (V), voltage Vi6=-120 (V), voltage Vc=-50 (V), voltage Va=-200 (V), voltage Vs=215 (V), voltage Vr=200 (V), voltage Ve=170 (V), voltage Vd=55 (V), voltage Vh=215 (V), voltage Vg=55 (V).But these magnitudes of voltage have only been enumerated the numerical value of an example of embodiment.Each magnitude of voltage is not limited to above-mentioned value, preferably is set at best value according to the characteristic of panel 10 or the specification of plasma display system etc.
Then, the relation that applies between the scan electrode 22 of forcing waveform of initialization and the field is described.
In the present embodiment, set the scan electrode 22 that applies the pressure waveform of initialization respectively to each based on following rule.
That is, N field continuous in time (N is natural number) is made as 1 field group, the N root scan electrode 22 that disposes continuously is made as 1 scan electrode group.For example, 3 fields continuous in time are made as 1 field group, 3 scan electrodes 22 that dispose continuously are made as 1 scan electrode group.
And, in 1 field group, apply each 1 time respectively to each scan electrode 22 that constitutes 1 scan electrode group and force waveform of initialization.
In addition, in constituting each of 1 field group, in 1 field, only 1 scan electrode 22 to each scan electrode group applies the pressure waveform of initialization.Therefore, for example, if the quantity of scan electrode 22 is 1080, the quantity of scan electrode group is 360, and the quantity that then applies the scan electrode 22 of forcing waveform of initialization in 1 field is 360.And, in next, apply the pressure waveform of initialization to other 360 scan electrodes 22, in the 3rd field, apply the pressure waveform of initialization to remaining 360 scan electrodes 22.
And, do not set and apply the scan electrode 22 of forcing waveform of initialization not apply the mode of forcing waveform of initialization to the scan electrode 22 adjacent with applying the scan electrode 22 of forcing waveform of initialization.
Figure 14 schematically shows the figure that applies the relation between the scan electrode 22 of forcing waveform of initialization and the field in embodiments of the present invention 2.
In Figure 14, the group representation field of transverse direction, the group representation scan electrode 22 of longitudinal direction.In addition, Figure 14 represents the example of N=3, namely constitutes 1 field group by 3 fields continuous in time, goes up 3 continuous scan electrodes 22 by configuration and constitutes 1 scan electrode group.
In addition, Figure 14 illustrates: Fj～field Fj+2, Fj+3～field Fj+5, Fj+6～field Fj+8, a Fj+9～field Fj+1 constitute a group respectively, and scan electrode SCi～scan electrode SCi+2, scan electrode SCi+3～scan electrode SCi+5, scan electrode SCi+6～scan electrode SCi+8 constitute the example of scan electrode group respectively.
In addition, in Figure 14, " zero " forces initialization action during being illustrated in the initialization of son SF1.That is, " zero " applies the pressure waveform of initialization with upward slope voltage L1 and descending voltage L2 to scan electrode 22 during being illustrated in the initialization of son SF1." * " do not force initialization action during being illustrated in the initialization of son SF1.That is, " * " applies the waveform of initialization with upward slope voltage L5 and descending voltage L2 to scan electrode 22 during being illustrated in the initialization of son SF1.
As can be seen from Figure 14, in 1 field group, apply each 1 time respectively to each scan electrode 22 that constitutes 1 scan electrode group and forced waveform of initialization.
For example, to scan electrode SCi Fj on the scene, Fj+3, a Fj+6, a Fj+9 ..., in applied the pressure waveform of initialization respectively.This also is same in other scan electrodes 22.
Thus, compare with the situation of carrying out 1 pressure initialization action at every, force the number of times of initialization action to be reduced to 1/3rd.Therefore, also become 1/3rd by the number of light emission times of forcing initialization action to produce, the amount that the shiny black degree that shows image also can be correspondingly.
In addition, in constituting each of 1 field group, only 1 scan electrode 22 to each scan electrode group applies the pressure waveform of initialization in 1 field.
For example, among the Fj on the scene, to scan electrode SCi, scan electrode SCi+3, scan electrode SCi+6 ..., apply the pressure waveform of initialization, among the Fj+1 on the scene, to scan electrode SCi+1, scan electrode SCi+4, scan electrode SCi+7 ..., apply the pressure waveform of initialization, among the Fj+2 on the scene, to scan electrode SCi+2, scan electrode SCi+5, scan electrode SCi+8 ..., apply the pressure waveform of initialization.This also is same in other.
Thus, can force the scan electrode 22 of waveform of initialization to be distributed to each with applying, therefore can reduce flicker (showing the situation of flashing that occurs on the image).
In addition, do not apply the pressure waveform of initialization to the scan electrode 22 adjacent with applying the scan electrode 22 of forcing waveform of initialization.
For example, among the Fj on the scene, apply the pressure waveform of initialization to scan electrode SCi+3, do not apply the pressure waveform of initialization to the scan electrode SCi+2 adjacent with scan electrode SCi+3 and scan electrode SCi+4.This also is same in other scan electrodes 22.
Thus, can reduce the temporal continuity that applies the scan electrode 22 of forcing waveform of initialization and the continuity on the space, so the user is difficult to identify follow and forces the luminous of initialization action.
Thus, in the present embodiment, in each discharge cell, only force initialization action in 1 field in continuous a plurality of.Thus, the number of times that will force initialization action is made as 1 time in a plurality of, reduce follow force that initialization action produces show the irrelevant luminous shiny black degree that reduces with gray scale, can show the high image of contrasts at panel 10.
In addition, force to have in the initialization action and in discharge cell, be accumulated in the action that produces wall electric charge required when writing discharge during follow-up the writing.In addition, also have generation and stably produce the action that writes the required triggering particle of discharge in order to shorten discharge delay time.
Therefore, if only be number of times that reduce to force initialization action, then during follow-up writing, be created in to have applied not produce in the discharge cell that writes pulse and write the bad possibility of writing of discharge and uprise.Perhaps, it is long and cause the write activity unstable equally likely possibility that becomes to uprise to write the discharge delay time of discharge.Therefore, might normally show image.
But, in the present embodiment, during the initialization of (for example, a son SF2 is to a son SF5), apply than 1st voltage (voltage 0 (V)) high 2nd voltage (voltage Vg) to data electrode D1～data electrode Dm in the 2nd seed field of selecting initialization action.
In addition, the minimum voltage (voltage Vi6) of the descending tilt waveform voltage (descending voltage L6) that will apply to scan electrode SC1～scan electrode SCn is set to such an extent that be higher than during as the initialization of the son SF1 of the 1st seed field the minimum voltage (voltage Vi4) of the descending tilt waveform voltage (descending voltage L2) that applies to scan electrode SC1～scan electrode SCn.
Thus, in the driving method of the present embodiment that has reduced the number of times of forcing initialization action, also can stably produce and write discharge.This is because following reason.
At first, illustrate during the initialization of the 1st seed field (son SF1) and do not apply the reason of positive voltage Vg to data electrode D1～data electrode Dm.
Exist in the discharge cell of forcing initialization action during the initialization of the 1st seed field (son SF1).Namely, there is following discharge cell: the first half during initialization, apply to the up tilt waveform voltage (upward slope voltage L1) that has or not the voltage Vi2 rising that irrespectively produces discharge immediately following the generation that writes discharge (keeping discharge) in the preceding son, discharge thereby forcibly produce initialization.
On the data electrode 32 of this discharge cell, the wall voltage that positive polarity is high.And, if accumulated in the discharge cell of the high wall voltage of positive polarity at data electrode 32, further apply positive voltage Vg to data electrode D1～data electrode Dm, then the voltage difference between scan electrode 22 and the data electrode 32 becomes excessive, and the possibility that the latter half during initialization produces strong discharge uprises.And, if latter half during initialization produces strong discharge, then at this discharge cell mesospore electric charge and trigger particle and become superfluous, during follow-up writing, produce the probability that misplaces electricity and uprise.
In the present embodiment, in order not produce this phenomenon, force in existence not apply positive voltage Vg to data electrode 32 during the initialization of the 1st seed field (son SF1) of the discharge cell of initialization action.
On the other hand, force the number of times of initialization action if reduce, then exist the deviation of the wall voltage of each discharge cell to become big possibility.
And, in the discharge cell of the wall voltage on having reduced data electrode 32, be difficult to produce the discharge between scan electrode 22 and the data electrode 32, be difficult to produce the initialization discharge.
But, the present inventor confirms by experiment: apply positive voltage to data electrode D1～data electrode Dm when selecting initialization action, thereby in selecting the discharge cell of initialization action, stably produce the initialization discharge, can further make the wall voltage unanimity on the data electrode Dk accurately.Think this be because: by applying positive voltage to data electrode D1～data electrode Dm, thereby stably produce discharge between scan electrode 22 and the data electrode 32 easily.
Therefore, in the present embodiment, during the initialization of the 2nd seed field of selecting initialization action (a son SF2 is to a son SF5), apply positive voltage Vg to data electrode D1～data electrode Dm.
In addition, for the strength of discharge of the initialization that will produce in discharge cell discharge is set the degree identical with the discharge that is produced by descending voltage L2 for, the mode that is substantially equal to the voltage difference of voltage Vi4 and the 1st voltage (voltage 0 (V)) with the voltage difference of voltage Vi6 and the 2nd voltage (voltage Vg) is set each voltage.Thus, can be with the strength of discharge that discharge is made as same degree that writes of forcing during the writing after the writing discharge and selecting initialization action during the writing after the initialization action.
In addition, to apply the voltage Vh higher than voltage Ve be in order to be higher than voltage Vi4 and to prevent at scan electrode 22 and keep the situation that is difficult to produce discharge between the electrode 23 by voltage Vi6 being set for to keeping electrode SU1～keep electrode SUn.
In the present embodiment, by such wall voltage of adjusting accurately on the data electrode Dk, thereby can cut down the number of times of forcing initialization action, can stably produce simultaneously and write discharge.
Then, illustrate the generation driving voltage waveform in the present embodiment circuit, the 1st seed field (son SF1) action of (a son SF2) to the 2nd seed field.
In addition, in the present embodiment employed scan electrode driving circuit, the structure of keeping electrode drive circuit and data electrode driver circuit and the scan electrode driving circuit 43 that in embodiment 1, illustrated, to keep electrode drive circuit 44 identical with data electrode driver circuit 42, the therefore explanation of omitting each circuit structure.
In the present embodiment, in Figure 12, driving voltage waveform shown in Figure 13, voltage Vi1 equals voltage Vp, and voltage Vi2 equals voltage (Vt+Vp), and voltage Vi3 equals voltage Vs, and voltage Vc equals voltage (Va+Vp).This is also identical in Fig. 5, driving voltage waveform shown in Figure 6.
In addition, in Figure 12, driving voltage waveform shown in Figure 13, voltage Vi5 equals voltage Vt, and voltage Vg equals voltage Vd, and voltage Vh equals voltage Vs.But these voltages are not limited to above-mentioned numerical value, preferably suitably set according to the characteristic of panel 10 or the specification of plasma display system etc.
Figure 15 is the sequential chart for the action of the driving circuit of the plasma display system of explanation embodiments of the present invention 2.
In addition, in Figure 15, in scan electrode SC1～scan electrode SCn, represent to apply the scan electrode 22 of forcing waveform of initialization by scan electrode SCx, represented not apply the scan electrode 22 of forcing waveform of initialization by scan electrode SCy.
In addition, in Figure 15, in on-off element Q71H1～on-off element Q71Hn, represent the on-off element corresponding with scan electrode SCx by on-off element Q71Hx, represented the on-off element corresponding with scan electrode SCy by on-off element Q71Hy.Similarly, in on-off element Q71L1～on-off element Q71Ln, on-off element Q71Lx has represented the on-off element corresponding with scan electrode SCx, has represented the on-off element corresponding with SCy by on-off element Q71Ly.
First half during the initialization of son SF1 is at first connected the on-off element Q56 of scan electrode driving circuit 43, applies voltage 0 (V) to scan electrode SCx, scan electrode SCy.
Then, cut-off switch element Q56, and at applying the scan electrode SCx that forces waveform of initialization, connect on-off element Q71Lx, connect on-off element Q71Hx, thereby apply voltage Vp.On the other hand, keep having applied the state of voltage 0 (V) at the scan electrode SCy that does not force initialization action.
Then, apply constant voltage to the input terminal IN61 of Miller integrating circuit 61, make the voltage of reference potential A slowly rise to voltage Vt.To applying the voltage that the scan electrode SCx that forces waveform of initialization is applied to the voltage Vp that superposeed on the reference potential A, therefore can apply the up tilt waveform voltage (upward slope voltage L1) that (Vt+Vp) slowly rises from voltage Vp to voltage to this scan electrode SCx.
On the other hand, to not implementing to force the scan electrode SCy of waveform of initialization to apply reference potential A, therefore can apply the up tilt waveform voltage (upward slope voltage L5) that slowly rises from voltage 0 (V) to voltage Vt to this scan electrode SCy.
Latter half during the initialization of a follow-up son SF1 disconnects the on-off element Q84 that keeps electrode drive circuit 44, connects on-off element Q86 and on-off element Q87, thereby to keeping electrode SU1～keep electrode SUn to apply voltage Ve.
Then, disconnect the on-off element Q71Hx of scan electrode driving circuit 43, connect on-off element Q71Lx, and connect on-off element Q55 and on-off element Q59, thereby apply voltage Vs to scan electrode SCx, scan electrode SCy.
Afterwards, cut-off switch element Q69 and apply constant voltage to the input terminal IN63 of Miller integrating circuit 63 and make Miller integrating circuit 63 work applies the descending tilt waveform voltage (descending voltage L2) that slowly descends from voltage Vi3 to voltage Vi4 to scan electrode SCx, scan electrode SCy.
During the writing of son SF1, the transistor Q63 of the Miller integrating circuit 63 of scan electrode driving circuit 43 is ended, connect on-off element Q72, the voltage of reference potential A is made as voltage Va.Then, cut-off switch element Q71Lx and on-off element Q71Ly connect on-off element Q71Hx and on-off element Q71Hy, thereby apply voltage (Va+Vp), are voltage Vc to scan electrode SCx and scan electrode SCy.
Then, cut-off switch element Q71H1 connects on-off element Q71L1, thereby applies the scanning impulse that is changed to voltage Va from voltage Vc to scan electrode SC1.
In addition, connect the on-off element Q91L1～on-off element Q91Lm of data electrode driver circuit 42, cut-off switch element Q91H1～on-off element Q91Hm applies voltage 0 (V) to data electrode D1～data electrode Dm.
And, in the moment that applies scanning impulse to scan electrode SC1, based on view data, at applying the data electrode Dj that writes pulse, cut-off switch element Q91Lj, and connect on-off element Q91Hj, thus apply the pulse that writes that is changed to voltage Vd from voltage 0 (V) to data electrode Dj.
(write activity of the 1st row finishes the back) connects on-off element Q71H1 after the certain hour, and cut-off switch element Q71L1 makes the voltage that applies that applies to scan electrode SC1 return to voltage Vc.Meanwhile, connect on-off element Q91Lj, cut-off switch element Q91Hj makes the voltage that applies that applies to data electrode Dj return to voltage 0 (V).Thus, SC1 applies scanning impulse to scan electrode, applies to data electrode Dj and writes pulse.
Then, scan electrode SC2 is carried out action same as described above, SC2 applies scanning impulse to scan electrode, applies to data electrode Dj and writes pulse.
In addition, Figure 15 represents to apply to scan electrode SCy the example of scanning impulse after scan electrode SCx applies scanning impulse.
Below, similarly, till scan electrode SCn, apply scanning impulse to scan electrode 22 successively, apply to data electrode Dj and write pulse.
Afterwards, difference cut-off switch element Q72, on-off element Q71Hx, on-off element Q71Hy, connect on-off element Q56, on-off element Q69, on-off element Q71Lx, on-off element Q71Ly respectively, thereby apply voltage 0 (V) to scan electrode SCx, scan electrode SCy.Like this, finish during writing.
During the keeping of son SF1, use scan electrode driving circuit 43 keep pulse-generating circuit 50 and keep electrode drive circuit 44 keep pulse-generating circuit 80, to scan electrode SC1～scan electrode SCn and keep electrode SU1～keep electrode SUn and apply the pulse of keeping with the corresponding number of luminance weights respectively.
And all in during producing this and keeping are kept after the pulse, disconnect the on-off element Q56 of scan electrode driving circuit 43.Meanwhile, apply constant voltage to the input terminal IN62 of Miller integrating circuit 62 and make Miller integrating circuit 62 work, apply the up tilt waveform voltage that slowly rises to voltage Vr to scan electrode SC1～scan electrode SCn.In addition, this voltage Vr is the voltage (for example, voltage Vr=voltage Vs-15 (V)) lower than voltage Vs.
During the initialization of a son SF2, the on-off element Q91L1～on-off element Q91Lm of turn-off data electrode drive circuit 42 connects on-off element Q91H1～on-off element Q91Hm, applies positive voltage Vd, is voltage Vg to data electrode D1～data electrode Dm.
In addition, connect the on-off element Q84 keep electrode drive circuit 44, connect on-off element Q83, to keeping electrode SU1～keep electrode SUn to apply voltage Vs, be voltage Vh.
And the state of on-off element Q71L1～on-off element Q71Ln, cut-off switch element Q71H1～on-off element Q71Hn that keep to connect scan electrode driving circuit 43 is constant, applies constant voltage to the input terminal IN63 of Miller integrating circuit 63.Make Miller integrating circuit 63 work thus, apply descending tilt waveform voltage to scan electrode SC1～scan electrode SCn.
If the descending tilt waveform voltage that applies to scan electrode SC1～scan electrode SCn has arrived voltage Vi6, then stop the voltage that is applying to input terminal IN63.Thus, apply the descending tilt waveform voltage (descending voltage L6) that slowly descends from voltage Vi3 ' (voltage 0 (V)) to voltage Vi6 to scan electrode SC1～scan electrode SCn.
During the writing of a follow-up son SF2 and during the writing of the action during keeping and son field SF1 and identical during keeping.
In addition, when producing descending cancellation ramp voltage L8, as long as the identical order of order when producing descending tilt waveform voltage during the initialization of a son SF2 produces the descending tilt waveform voltage that slowly drops to voltage Vi8 and gets final product.
Thus, in the present embodiment, can use data electrode driver circuit 42, scan electrode driving circuit 43 and keep electrode drive circuit 44 to produce Figure 12, driving voltage waveform shown in Figure 13, impose on data electrode D1～data electrode Dm, scan electrode SC1～scan electrode SCn respectively and keep electrode SU1～keep electrode SUn.
And, during the initialization of the 1st seed field, apply descending tilt waveform voltage to scan electrode 22 in, apply the 1st voltage (voltage 0 (V)) to data electrode 32.In addition, during the initialization of the 2nd seed field, apply descending tilt waveform voltage to scan electrode in, apply 2nd voltage higher than the 1st voltage (voltage Vg) to data electrode.Thus, cut down and force the number of times of initialization action to suppress shiny black degree, can carry out stable write activity simultaneously.
Like this, in the present embodiment, be made as 1 time in a plurality of by the number of times that will force initialization action, thereby compare with the formation of in 1, carrying out 1 pressure initialization action, can reduce and follow force initialization action to produce luminous.Thus, can reduce shiny black degree (not producing the brightness of the gray scale of keeping discharge), improve the contrast of the image that shows at panel 10.
And, identical with embodiment 1, using the form, example the 1st form as shown in Embodiment 1 that do not produce " the continuous non-son field of lighting more than 2 " to come when panel 10 shows image, produce each electrode that the 1st driving voltage waveform shown in Figure 12 imposes on panel 10, drive panel 10.
In addition, in case after the some transom field, produce the continuous non-son field of lighting more than 2, when having the possibility of the discharge cell of being lighted again in the son field after being created in, namely in form, exist have thisly light, during the coding of non-combination of lighting, namely example the 2nd form as shown in Embodiment 1 is next when panel 10 demonstration images to use this form, produces each electrode that the 2nd driving voltage waveform shown in Figure 13 imposes on panel 10, driving panel 10.
That is, with the time upward is made as particular subfield in the sub-field of generation earlier among non-sub of lighting more than 2 afterwards, continuous in case light sub-field.And, in particular subfield, last keeping after the pulse during generation is kept produces from the voltage 0 (V) as rheobase and imposes on scan electrode SC1～scan electrode SCn to the 3rd descending tilt waveform voltage (descending cancellation ramp voltage L8) that the voltage Vi8 as the 2nd assigned voltage slowly descends.
Thus, after in a certain son field, lighting discharge cell, then the continuous son field more than 2 of this child field becomes non-lighting, after son in when lighting this discharge cell again, can prevent from this child field, producing write badly, can prevent the deterioration of the image display quality of plasma display system.
In addition, last keeping after the pulse during generation is kept, to apply the state of voltage 0 (V) constant to keeping electrode SU1～keep electrode SUn and data electrode D1～data electrode Dm in maintenance, applies the up tilt waveform voltage (up cancellation ramp voltage L3) that slowly rises to the voltage Vr as the 1st assigned voltage from the voltage 0 (V) less than discharge ionization voltage to scan electrode SC1～scan electrode SCn.And, voltage Vr is set at is lower than voltage Vs and during follow-up writing, can not produce the voltage that misplaces electricity.Thus, when driving the big picture panel 10 of high-fineness, also can carry out stable write activity, can be on panel 10 the high image of display quality.
In addition, in the present embodiment, the formation of forcing initialization action with 1 time ratio in 3 has been described in each discharge cell, the present invention is not limited to these formations.Preferably according to the specification of the characteristic of panel 10 or plasma display system, and the setting of the contrast ratio of the image that shows at panel 10 wait suitable selection how to set the number of times of forcing initialization action.
In addition, in the present embodiment, illustrated that first half during the initialization of the 1st seed field forces the scan electrode 22 of initialization action to apply the formation of upward slope voltage L5, but the present invention is not limited to these formations.First half during the initialization of the 1st seed field, imposing on the voltage of the scan electrode 22 of forcing initialization action so long as can not produce the voltage of discharge in the discharge cell on being formed at this scan electrode 22 and get final product, for example can be that voltage is the fixed voltage of 0 (V) etc.
(embodiment 3)
In embodiment 1 and embodiment 2, the formation that the maximum voltage of up cancellation ramp voltage L3 is set at the voltage Vr that is lower than voltage Vs in all son fields has been described.But the present invention is not limited to these and constitutes, and also can be the formation that produces the up cancellation ramp voltage that rises to the above voltage of voltage Vs.
The present inventor confirms at 1 final son field: replace up cancellation ramp voltage L3, and be applied with the up tilt waveform voltage of the voltage that rises to more than the voltage Vs to scan electrode SC1～scan electrode SCn, thereby can more stably produce write activity.
Think this be because: for keeping for the many sons of umber of pulse of during keeping, producing, the wall electric charge that in keeping action, produces and trigger the particle surplus, the action after can making it when therefore establishing the cancellation action bigger is stablized.
Therefore, in the present embodiment, only in 1 final son field, produce the up cancellation ramp voltage L7 that rises to the voltage Vr2 more than the voltage Vs, and impose on scan electrode SC1～scan electrode SCn.
The figure of one example of Figure 16 the 1st driving voltage waveform that to be expression apply to each electrode of the employed panel 10 of the plasma display system of embodiments of the present invention 3.
The figure of one example of Figure 17 the 2nd driving voltage waveform that to be expression apply to each electrode of the employed panel 10 of the plasma display system of embodiments of the present invention 3.
Figure 16, Figure 17 represent to the scan electrode SC1 that during writing, carries out write activity at first, during writing, carry out at last write activity scan electrode SCn, keep electrode SU1～keep electrode SUn, and driving voltage waveform that data electrode D1～data electrode Dm applies respectively.
The 1st driving voltage waveform shown in Figure 16 is the waveform shape roughly the same with the 1st driving voltage waveform shown in Figure 5.Wherein, be the last replacement up cancellation ramp voltage L3 during the keeping of final son (a son SF5) and produce up cancellation ramp voltage L7 with the difference of the 1st driving voltage waveform shown in Figure 5.
The 2nd driving voltage waveform shown in Figure 17 is the waveform shape roughly the same with the 2nd driving voltage waveform shown in Figure 6.Wherein, be with the difference of the 2nd driving voltage waveform shown in Figure 6 that last during the keeping of final son (a son SF5) replaces up cancellation ramp voltage L3 and produce up cancellation ramp voltage L7.
The figure of another example of Figure 18 the 1st driving voltage waveform that to be expression apply to each electrode of the employed panel 10 of the plasma display system of embodiments of the present invention 3.
The figure of another example of Figure 19 the 2nd driving voltage waveform that to be expression apply to each electrode of the employed panel 10 of the plasma display system of embodiments of the present invention 3.
Figure 18, Figure 19 represent to the scan electrode SC1 that during writing, carries out write activity at first, during writing the 2nd scan electrode SC2 that carries out write activity, keep electrode SU1～keep electrode SUn, and driving voltage waveform that data electrode D1～data electrode Dm applies respectively.
The 1st driving voltage waveform shown in Figure 180 is the waveform shape roughly the same with the 1st driving voltage waveform shown in Figure 12.Wherein, be with the difference of the 1st driving voltage waveform shown in Figure 12 that last during the keeping of final son (a son SF5) replaces up cancellation ramp voltage L3 and produce up cancellation ramp voltage L7.
The 2nd driving voltage waveform shown in Figure 19 is the waveform shape roughly the same with the 2nd driving voltage waveform shown in Figure 13.Wherein, be with the difference of the 2nd driving voltage waveform shown in Figure 13 that last during the keeping of final son (a son SF5) replaces up cancellation ramp voltage L3 and produce up cancellation ramp voltage L7.
Figure 16, Figure 17, Figure 18, up cancellation ramp voltage L7 shown in Figure 19 are the up tilt waveform voltage that rises to the voltage Vr2 more than the voltage Vs with the gradient identical with up cancellation ramp voltage L3.In the present embodiment, for example voltage Vr2 is set at about 255 (V).
In addition, in embodiment, the experiment of carrying out based on the present inventor has been set voltage Vr2 at voltage Vs+0 (V) to the scope of voltage Vs+60 (V).
This be because: up cancellation ramp voltage L7 produces faint discharge in producing the discharge cell of keeping discharge, but if voltage Vr2 is set at than its upper limit big value also, the discharge surplus that is caused by up cancellation ramp voltage L7 then, it is big that the Weak-luminescence that this discharge causes becomes, shiny black degree (producing the brightness that the discharge cell keep discharge produces) rises, and might damage the contrast that shows image.
Thus, in the present embodiment, during the keeping of final son (a son SF5), last keeping after the pulse during generation is kept, to apply the state of voltage 0 (V) constant to keeping electrode SU1～keep electrode SUn and data electrode D1～data electrode Dm in maintenance, applies the up tilt waveform voltage (up cancellation ramp voltage L7) that slowly rises to the voltage Vr2 more than the voltage Vs from the voltage 0 (V) less than discharge ionization voltage to scan electrode SC1～scan electrode SCn.
And, in the son field except final son field, identical with embodiment 1, embodiment 2, last keeping after the pulse during generation is kept, to apply the state of voltage 0 (V) constant to keeping electrode SU1～keep electrode SUn and data electrode D1～data electrode Dm in maintenance, applies the up tilt waveform voltage (up cancellation ramp voltage L3) that slowly rises to the voltage Vr as the 1st assigned voltage from the voltage 0 (V) less than discharge ionization voltage to scan electrode SC1～scan electrode SCn.Voltage Vr is set to and is lower than voltage Vs and can produce the voltage that misplaces electricity during follow-up keeping.
Thus, more stably carry out write activity and keep action, can further improve the image display quality on the panel 10.
In addition, under the situation that can't produce the up cancellation ramp voltage L7 that rises to voltage Vr2 on the formation of circuit, the replacement waveform of up cancellation ramp voltage L7 is imposed on scan electrode SC1～scan electrode SCn in 1 final son field, can realize action same as described above.
The figure of other examples of the waveform shape of Figure 20 up tilt waveform voltage that to be expression produce in order to produce the cancellation action during the keeping of 1 of embodiments of the present invention 3 final son.
In addition, Figure 20 also shows up cancellation ramp voltage L7 together in order to compare.
For example, in Miller integrating circuit 62, can only produce the up tilt waveform voltage of voltage Vr.Therefore, apply constant voltage to the input terminal IN62 of Miller integrating circuit 62 and make Miller integrating circuit 62 work, temporarily apply the up tilt waveform voltage that slowly rises to voltage Vr to scan electrode SC1～scan electrode SCn.This voltage Vr is the voltage (for example, voltage Vr=voltage Vs-15 (V)) lower than voltage Vs.
After up tilt waveform voltage arrives voltage Vr, stop the action of Miller integrating circuit 62, make to the voltage that scan electrode SC1～scan electrode SCn applies and turn back to voltage 0 (V).
Afterwards, cut-off switch element Q71L1～on-off element Q71Ln connects on-off element Q71H1～on-off element Q71Hn, and superimposed voltage Vp on reference potential A makes Miller integrating circuit 62 work again under this state.Thus, can be created in the waveform voltage of the voltage Vp that superposeed on the up tilt waveform voltage that Miller integrating circuit 62 produces.Therefore, can be applied with to scan electrode SC1～scan electrode SC and rise to the up tilt waveform voltage of high voltage also than voltage Vr.
Then, if rise to voltage Vr2 to the voltage that scan electrode SC1～scan electrode SCn applies, then stop the action of Miller integrating circuit 62, connect on-off element Q71L1～on-off element Q71Ln, cut-off switch element Q71H1～on-off element Q71Hn applies reference potential A to scan electrode SC1～scan electrode SCn.And, connect on-off element Q56, reference potential A is made as voltage 0 (V), make to the voltage that scan electrode SC1～scan electrode SCn applies and turn back to voltage 0 (V).
Thus, generation has from voltage 0 (V) and (for example rises to voltage Vr, about 200 (V)) up tilt waveform voltage and (for example rise to voltage Vr2 from voltage Vp (for example, about 150 (V)), the waveform of up these 2 peak values of tilt waveform voltage about 255 (V)) can impose on scan electrode SC1～scan electrode SCn.For example, by such waveform, can also replace up cancellation ramp voltage L7.
In addition, in the present embodiment, explanation of force produces the formation of descending tilt waveform voltage (descending voltage L4, descending voltage L6, descending cancellation ramp voltage L8) with identical gradient, but for example also can be with descending tilt waveform voltage be divided into a plurality of during and during each, change the formation that gradient produces descending tilt waveform voltage.
Other routine oscillograms of the waveform shape of Figure 21 descending tilt waveform voltage that to be expression apply to the scan electrode 22 of embodiments of the present invention.
For example, it also can be formation as shown in figure 21, namely till producing the initialization discharge with the gradient of steeper (for example,-8V/ μ sec) descends, descend with mild a little gradient (for example ,-2.5V/ μ sec) afterwards, at last with milder gradient (for example,-1V/ μ sec) descends, produce descending tilt waveform voltage thus.Even this formation confirms also and can access effect same as described above.In addition, in this constitutes, can also obtain shortening produce descending tilt waveform voltage during effect.
Perhaps, though diagram, also can be divided into descending tilt waveform voltage during 2 and during each the change gradient produce the formation of descending tilt waveform voltage.
In addition, in the present embodiment, figure 4 illustrates the 2nd form as the object that produces the 2nd driving voltage waveform, but the present invention is not defined as form shown in Figure 4 with the 2nd form.
Figure 22 is the figure of other examples of the 2nd coding form of expression embodiments of the present invention.
Among Figure 22, the row of the left end of form with numeric representation in discharge cell the size of gray-scale displayed, in recording each row of numerical value, be illustrated in the discharge cell luminous, non-luminous combination of each son when showing its brightness value.In addition, in each coding form shown in Figure 22, empty hurdle is represented not luminous, and " zero " expression is luminous.
Figure 22 represents to constitute 1 by 5 sons (son SF1, a son SF2, a son SF3, a son SF4, a son SF5), and the form of a son SF1 when having the luminance weights of (1,16,8,4,2) respectively to each son of a son SF5.And the size of the form that Figure 22 is and its sub-number of fields of the 1st form shown in Figure 3, the luminance weights set in 1, to want the gray-scale displayed number be identical.
Wherein, distribute to size (putting in order of the luminance weights) difference of the luminance weights of each son field, form shown in Figure 22 each son luminance weights of having distributed (1,2,4,8,16) respectively to a son SF1 to son field SF5.
Its result in form shown in Figure 22, is different from the 1st form shown in Figure 3, and like that, producing a son SF2 becomes the non-brightness value of lighting (brightness value " 3 ", brightness value " 5 ", brightness value " 7 ") continuously with a son SF3 shown in the arrow of Figure 22.Therefore, form shown in Figure 22 also becomes the object that produces the 2nd driving voltage waveform, i.e. the 2nd form.
Like this, in embodiments of the present invention, in case after the some transom field, produce the continuous non-son of lighting more than 2, after son in might produce the discharge cell of lighting again the time, namely in form existence have light/during the coding of non-combination of lighting, with this form as the 2nd form, use the 2nd form when panel 10 shows image, produce each electrode that the 2nd driving voltage waveform imposes on panel 10, drive panel 10.
In addition, in the present embodiment, illustrated that having a son SF2 becomes the example of the 2nd form of the non-coding of lighting continuously with a son SF3, and the example that when producing the 2nd driving voltage waveform a son SF2 is made as particular subfield has been described.But the present invention is not defined as particular subfield a son SF2.
For example, when existing a son SF3 and a son SF4 to become the non-possibility of lighting continuously, particular subfield becomes SF3.Perhaps, comprised in use that sub SF1 is lighted, a son SF2 and a son SF3 become non-light and coding and a son SF2 that a son SF4 is lighted are lighted, a son SF3 and a son SF4 become non-lighting and the form of the coding that a son SF5 is lighted when image is shown in panel continuously continuously, particular subfield becomes a son SF2 and a son SF3.
Thus, in embodiments of the present invention, particular subfield changes along with the coding that constitutes form.And the quantity of " particular subfield " is not limited to 1.
In addition, in the present embodiment, the formation of carrying out whole unit initialization action and selecting an action in the initialization action in all son fields has been described.But, for example, also can be the formation that drives panel when producing the field of once not carrying out whole unit initialization action at all discharge cells on the panel.And, even in this case, also can use the formation shown in the present embodiment.
In addition, the present invention will not constitute 1 sub quantity, be defined as above-mentioned numerical value as the son field of the initial beggar of pressure field, the luminance weights that each sub-place possesses etc.In addition, also can be based on picture signal and wait to switch a son structure that constitutes.
In addition, Fig. 5, Fig. 6, Figure 12, Figure 13, Figure 15, Figure 16, Figure 17, Figure 18, driving voltage waveform shown in Figure 19 be the example in the embodiments of the present invention only, and the present invention is not limited to these driving voltage waveform.
In addition, the formation of Fig. 8, Fig. 9, Figure 10, driving circuit shown in Figure 11 is the example in the embodiments of the present invention only, and the present invention is not limited to these circuit and constitutes.
In addition, each circuit block shown in the embodiments of the present invention also can constitute the circuit of each action of carrying out shown in the embodiment, perhaps also can use the microcomputer of programming according to the mode of carrying out same action to wait to constitute.
In addition, in embodiments of the present invention, the example that is made of 1 field 5 son fields has been described.But the quantity that the present invention will not constitute 1 son field is defined as above-mentioned number.For example, also can arrange more sub-number of fields come further increase can be on panel 10 the gray-scale displayed number.Perhaps, also can shorten the required time of driving of panel 10 by the number that reduces the son field.
In addition, in embodiments of the present invention, illustrated by discharge cells red, green, blue these 3 colors and constituted the example of 1 pixel, but constitute in the panel of 1 pixel at the discharge cell by 4 colors or the color more than this, also the formation shown in the embodiments of the present invention can be suitable for, also same effect can be accessed.
In addition, it be 50 inches, show electrode to 24 quantity is that the characteristic of 1024 panel 10 is set that the concrete numerical value that illustrates in embodiments of the present invention is based on picture dimension, has only represented an example of embodiment.The present invention is not limited to these numerical value, each numerical value preferably according to the characteristic of the specification of panel or panel, and the specification of plasma display system wait best and set.In addition, these each numerical value have allowed deviation in the scope that can obtain above-mentioned effect.In addition, the luminance weights etc. that constitutes 1 the quantity of son or each son also is not limited to the value shown in the embodiments of the present invention, and also can be based on picture signal and wait to switch a son structure that constitutes.
-industrial applicability-
The present invention also can carry out stable write activity when driving the big picture panel of high-fineness, can be on panel the high image of display quality, be useful as driving method and the plasma display system of panel.
-symbol description-
10 panels
21 front substrates
22 scan electrodes
23 keep electrode
24 show electrodes are right
25,33 dielectric layers
26 protective seams
31 back substrates
32 data electrodes
34 next doors
35 luminescent coatings
40 plasma display systems
41 imaging signal processing circuits
42 data electrode driver circuits
43 scan electrode driving circuits
44 keep electrode drive circuit
45 timing generation circuits
50,80 keep pulse-generating circuit
51,81 power recovery circuits
60 tilt waveform voltage generation circuits
61,62,63 Miller integrating circuits
70 scanning impulses produce circuit
85 constant voltages produce circuit
Di11, Di12, Di21, Di22, Di62 diode
L11, L12, L21, L22 inductor
Q5, Q6, Q11, Q12, Q21, Q22, Q55, Q56, Q59, Q69, Q72, Q83, Q84, Q86, Q87, Q71H1～Q71Hn, Q71L1～Q71Ln, Q91H1～Q91Hm, Q91L1～Q91Lm on-off element
C10, C20, C61, C62, C63 capacitor
R61, R62, R63, R9, R12, R13 resistance
Q61, Q62, Q63 transistor
IN61, IN62, IN63 input terminal
The E71 power supply
L1, L5 upward slope voltage
L2, L4, L6 descending voltage
L3, the up cancellation ramp voltage of L7
The descending cancellation ramp voltage of L8

Claims (11)

1. the driving method of a Plasmia indicating panel, this plasma display panel has possessed a plurality of discharge cells, each discharge cell has by scan electrode and to keep the show electrode that electrode constitutes right, and data electrode, by have in discharge cell that should be luminous, produce write the writing of discharge during, produce with the corresponding number of sustain pulses of luminance weights impose on described show electrode right keep during a plurality of sons constitute 1, among a plurality of combination different with non-luminous sub combination of luminous son, select a plurality of demonstrations that show for gray scale to generate the demonstration composite set with combination, being subordinated to described demonstration based on picture signal uses the demonstration of composite set with selecting 1 demonstration with making up among the combination, the described demonstration that use is selected with combination by each son field control discharge cell luminous/ not luminously drive described Plasmia indicating panel, in the driving method of this plasma display panel
Based on the described demonstration combination that described demonstration comprises with composite set, generation has the field of following son field:
Produce last described the keeping after the pulse during described the keeping, apply the son that rises to the up tilt waveform voltage of the 1st assigned voltage from rheobase to described scan electrode; With
Produce last described the keeping after the pulse during described the keeping, apply the descending tilt waveform voltage that drops to the 2nd assigned voltage from rheobase to described scan electrode, apply the particular subfield of described up tilt waveform voltage afterwards to described scan electrode.
2. the driving method of Plasmia indicating panel according to claim 1, wherein,
Have:
In 1, earlier luminous son and time are gone up the 1st demonstration composite set that can not produce the continuous non-luminous son more than 2 between the luminous son in back in time; With
In 1, earlier luminous son and time are gone up the 2nd demonstration composite set that produces the continuous non-luminous son more than 2 between the luminous son in back in time,
Using the described the 1st to show with composite set when described Plasmia indicating panel shows image, do not produce described particular subfield,
Using the described the 2nd to show with composite set when described Plasmia indicating panel shows image, produce described particular subfield.
3. the driving method of Plasmia indicating panel according to claim 2, wherein,
The described the 2nd shows that going up the son field that produces earlier with the time in the described continuous non-luminous son field more than 2 in the composite set is described particular subfield.
4. the driving method of a Plasmia indicating panel, this plasma display panel has possessed a plurality of discharge cells, each discharge cell has by scan electrode and to keep the show electrode that electrode constitutes right, and data electrode, by during having an initialization, generation writes during the writing of discharge in discharge cell that should be luminous, with generation and the corresponding number of sustain pulses of luminance weights impose on described show electrode right keep during a plurality of sons constitute 1, among a plurality of combination different with non-luminous sub combination of luminous son, select a plurality of demonstrations that show for gray scale to generate the demonstration composite set with combination, being subordinated to described demonstration based on picture signal uses the demonstration of composite set with selecting 1 demonstration with making up among the combination, the described demonstration that use is selected with combination by each son field control discharge cell luminous/ not luminously drive described Plasmia indicating panel, in the driving method of this plasma display panel
In 1, arrange: the 1st seed field, during described initialization, there is the scan electrode of the 1st descending tilt waveform voltage be applied with the up tilt waveform voltage that rises to the voltage that in described discharge cell, produces discharge and descend to negative voltage and is applied to the voltage that do not produce discharge in the described discharge cell and the scan electrode of the described the 1st descending tilt waveform voltage; With the 2nd seed field, during described initialization, apply to described scan electrode and only to drop to immediately following the 2nd descending tilt waveform voltage that produced the voltage that generation is discharged in the discharge cell that writes discharge in the preceding son,
During the initialization of described the 1st seed field, to described scan electrode apply the described the 1st descending tilt waveform voltage during in apply the 1st voltage to described data electrode, in during the initialization of described the 2nd seed field, to described scan electrode apply the described the 2nd descending tilt waveform voltage during in apply 2nd voltage higher than described the 1st voltage to described data electrode
Based on the described demonstration combination that described demonstration comprises with composite set, generation has the field of following son field:
Produce last described the keeping after the pulse during described the keeping, apply the son that rises to the up tilt waveform voltage of the 1st assigned voltage from rheobase to described scan electrode; With
Produce last described the keeping after the pulse during described the keeping, apply the 3rd descending tilt waveform voltage that drops to the 2nd assigned voltage from rheobase to described scan electrode, apply the particular subfield of described up tilt waveform voltage afterwards to described scan electrode.
5. the driving method of Plasmia indicating panel according to claim 4, wherein,
Have: in 1, in time earlier luminous son and time go up can not produce between the luminous son in back the 1st of the continuous non-luminous son more than 2 show use composite set and
In 1, earlier luminous son and time are gone up the 2nd demonstration composite set that produces the continuous non-luminous son more than 2 between the luminous son in back in time,
Using the described the 1st to show with composite set when described Plasmia indicating panel shows image, do not produce described particular subfield,
Using the described the 2nd to show with composite set when described Plasmia indicating panel shows image, produce described particular subfield.
6. the driving method of Plasmia indicating panel according to claim 5, wherein,
The described the 2nd shows that going up the son field that produces earlier with the time in the described continuous non-luminous son field more than 2 in the composite set is described particular subfield.
7. the driving method of Plasmia indicating panel according to claim 4, wherein,
The minimum voltage of the described the 2nd descending tilt waveform voltage is made as the voltage higher than the minimum voltage of the described the 1st descending tilt waveform voltage, thereby produces the described the 2nd descending tilt waveform voltage
8. the driving method of Plasmia indicating panel according to claim 4, wherein,
Apply to described scan electrode the described the 1st descending tilt waveform voltage during, apply positive voltage to the described electrode of keeping,
Apply to described scan electrode the described the 2nd descending tilt waveform voltage during, apply the voltage higher than described positive voltage to the described electrode of keeping.
9. plasma display system, it possesses the Plasmia indicating panel that comprises a plurality of discharge cells, with constitute 1 driving circuit that drives described Plasmia indicating panel by a plurality of son fields, wherein, each discharge cell has by scan electrode and to keep the show electrode that electrode constitutes right, and data electrode, each son field has to produce in discharge cell that should be luminous and writes during the writing of discharge, with generation and the corresponding number of sustain pulses of luminance weights impose on described show electrode right keep during, in this plasma display device
Described driving circuit
Among a plurality of combination different with non-luminous sub combination of luminous son, select a plurality of demonstrations that show for gray scale to generate the demonstration composite set with combination, being subordinated to described demonstration based on picture signal uses the demonstration of composite set with selecting 1 demonstration with making up among the combination, the described demonstration that use is selected with combination by each son control discharge cell luminous/not luminous
With the described demonstration combination that composite set comprises, produce the field with following son field based on described demonstration, drive described Plasmia indicating panel:
Produce last described the keeping after the pulse during described the keeping, apply the son that rises to the up tilt waveform voltage of the 1st assigned voltage from rheobase to described scan electrode; With
Produce last described the keeping after the pulse during described the keeping, apply the descending tilt waveform voltage that drops to the 2nd assigned voltage from rheobase to described scan electrode, apply the particular subfield of described up tilt waveform voltage afterwards to described scan electrode.
10. plasma display system according to claim 9, wherein,
Described driving circuit has:
In 1, in time earlier luminous son and time go up can not produce between the luminous son in back the 1st of the continuous non-luminous son more than 2 show use composite set and
In 1, earlier luminous son and time are gone up the 2nd demonstration composite set that produces the continuous non-luminous son more than 2 between the luminous son in back in time,
Using the described the 1st to show with composite set when described Plasmia indicating panel shows image, do not produce described particular subfield,
Using the described the 2nd to show with composite set when described Plasmia indicating panel shows image, produce described particular subfield.
11. plasma display system, it possesses the Plasmia indicating panel that comprises a plurality of discharge cells, with constitute 1 driving circuit that drives described Plasmia indicating panel by a plurality of son fields, wherein, each discharge cell has by scan electrode and to keep the show electrode that electrode constitutes right, and data electrode, each son field has during the initialization, generation writes during the writing of discharge in discharge cell that should be luminous, with generation and the corresponding number of sustain pulses of luminance weights impose on described show electrode right keep during, in this plasma display device
Described driving circuit,
Among a plurality of combination different with non-luminous sub combination of luminous son, select a plurality of demonstrations that show for gray scale to generate the demonstration composite set with combination, being subordinated to described demonstration based on picture signal uses the demonstration of composite set with selecting 1 demonstration with making up among the combination, the described demonstration that use is selected with combination by each son field control discharge cell luminous/not luminous
The 1st seed field is set in 1 and the 2nd seed field drives described Plasmia indicating panel, wherein, in the 1st seed field, during described initialization, the scan electrode that has the 1st descending tilt waveform voltage be applied with the up tilt waveform voltage that rises to the voltage that in described discharge cell, produces discharge and descend to negative voltage, and be applied to the voltage that do not produce discharge in the described discharge cell and the scan electrode of the described the 1st descending tilt waveform voltage, and in the 2nd seed field, during described initialization, apply to described scan electrode and only to drop to immediately following the 2nd descending tilt waveform voltage that produced the voltage that generation is discharged in the discharge cell that writes discharge in the preceding son
During the initialization of described the 1st seed field, to described scan electrode apply the described the 1st descending tilt waveform voltage during in apply the 1st voltage to described data electrode, during the initialization of described the 2nd seed field, to described scan electrode apply the described the 2nd descending tilt waveform voltage during in apply 2nd voltage higher than described the 1st voltage to described data electrode
With the described demonstration combination that composite set comprises, produce the field with following son field based on described demonstration, drive described Plasmia indicating panel:
Produce last described the keeping after the pulse during described the keeping, to described scan electrode apply from rheobase rise to the 1st assigned voltage up tilt waveform voltage Zi Chang and
Produce last described the keeping after the pulse during described the keeping, apply the 3rd descending tilt waveform voltage that drops to the 2nd assigned voltage from rheobase to described scan electrode, apply the particular subfield of described up tilt waveform voltage afterwards to described scan electrode.
CN2012800040440A 2011-01-28 2012-01-25 Method for driving plasma display panel, and plasma display apparatus Pending CN103250201A (en)

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JP2005301013A (en) * 2004-04-14 2005-10-27 Matsushita Electric Ind Co Ltd Method for driving plasma display panel
JP2008197430A (en) * 2007-02-14 2008-08-28 Matsushita Electric Ind Co Ltd Driving method of plasma display device
JP2009250995A (en) * 2008-04-01 2009-10-29 Panasonic Corp Plasma display device and driving method of plasma display panel
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Application publication date: 20130814