CN1783185A - Plasma display device and driving method thereof - Google Patents

Plasma display device and driving method thereof Download PDF

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Publication number
CN1783185A
CN1783185A CNA2005101247854A CN200510124785A CN1783185A CN 1783185 A CN1783185 A CN 1783185A CN A2005101247854 A CNA2005101247854 A CN A2005101247854A CN 200510124785 A CN200510124785 A CN 200510124785A CN 1783185 A CN1783185 A CN 1783185A
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voltage
electrode
group
cycle
plasma display
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CNA2005101247854A
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CN100495502C (en
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伊藤一裕
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Samsung SDI Co Ltd
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Samsung SDI Co Ltd
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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
    • G09G3/296—Driving circuits for producing the waveforms applied to the driving electrodes
    • 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
    • G09G3/292—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 reset discharge, priming discharge or erase discharge occurring in a phase other than addressing
    • 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

A driving waveform is applied to a scan electrode while a sustain electrode is biased at a ground voltage such that a driving board for driving the sustain electrode may not be needed. In addition, when grouping a plurality of scan electrodes into a plurality of groups and representing grayscale values using a frame-subfield method, a sustain discharge may be stably generated during a sustain period by reducing a time gap between address and sustain periods. When a sustain pulse is applied during a sustain period between two adjacent address periods, the last voltage is set to be a low level voltage.

Description

Plasma display equipment and driving method thereof
Technical field
The present invention relates to plasma display equipment and the method that is used to drive this plasma display device.
Background technology
Plasma display equipment is a kind of use comes character display or image by the plasma of gas discharge generation a display device.According to size, it comprises that nearly hundreds of thousands is to millions of pixels of arranging with matrix form.According to its discharge cell structure with to the waveform of its driving voltage that applies, this plasma display panel (PDP) is divided into direct current (DC) type and exchanges (AC) type.
DC PDP has the electrode that is exposed to discharge space, therefore, when applying voltage it allow directly to flow through the charging space.Therefore, the shortcoming of this DC PDP is the resistance that need be used for current limliting.On the other hand, AC PDP has the electrode that covers with dielectric layer, and this dielectric layer is in order to form capacitor with the restriction electric current and be not subjected to the influence of ion in the interdischarge interval guard electrode.As a result, AC PDP is longer than the life-span of DCPDP.
Usually, the frame of AC PDP is divided into a plurality of son, and each son comprises reset cycle, addressing period and keeps the cycle.
Reset cycle is used for the state of each discharge cell of initialization, thereby be convenient on discharge cell, carry out addressing operation, and addressing period be used to select on the flat board the conduction and cut-off unit (promptly, with the unit that is switched on or ends), and the wall electric charge is accumulated to onunit (that is the unit of addressing).The cycle of keeping be used to impel the discharge in case on the unit of addressing display image.
In order to carry out aforesaid operations, during the cycle of keeping, will keep pulse and alternately be applied to scan electrode and keep electrode, and during reset cycle and addressing period, reset wave and sweep waveform will be applied to scan electrode.Therefore, need to be used for the turntable driving plate of driven sweep electrode respectively and be used to drive the drive plate of keeping of keeping electrode, and in this case, may be present in the problem that drive plate is installed on the chassis, and since independently drive plate make the cost increase.
Therefore, for two drive plates are combined into single compoboard, having proposed provides single plate at the end of scan electrode, and the end of keeping electrode is extended to arrive the scheme of compoboard.Yet, when two drive plates of combination like this, increased the impedance compoment that the electrode place forms of keeping that is extending.
Summary of the invention
Embodiments of the invention comprise a kind of plasma display equipment and driving method thereof, and it has removes the feature that drives the drive plate of keeping electrode.
In addition, embodiments of the invention have the feature that comprises prevent to misfire (misfire).
In one exemplary embodiment, a kind of driving method of plasma display equipment is divided into a plurality of sons field with a frame.Described plasma display equipment has a plurality of first electrodes and a plurality of second electrode, and described a plurality of second electrodes are grouped into a plurality of groups that comprise first group and second group.According to one embodiment of present invention, described plasma display equipment comprises that at least one has a plurality of addressing periods of corresponding respectively to a plurality of groups and a plurality of son of keeping the cycle.During each addressing period of first and second groups, from the unit of first group and second group, select onunit.During a plurality of first in the middle of cycles of keeping are kept the cycle, when a plurality of first electrodes are biased in first voltage, comprising producing in first group a plurality of groups the unit and keeping discharge by alternately applying second voltage and tertiary voltage to a plurality of second electrodes, wherein, first cycle of keeping was provided between a plurality of addressing periods of first group and second group.Second voltage and tertiary voltage are respectively above and below first voltage.After a plurality of addressing periods of keeping in the middle of the cycle of second group, provide second keep the cycle during, when a plurality of first electrodes are biased in first voltage, comprising producing on a plurality of groups the unit of at least the first group and second group and keeping discharge by alternately applying the 4th voltage and the 5th voltage to a plurality of second electrodes.
Exemplary plasma display device according to an embodiment comprises plasma display panel, drive plate and chassis.Plasma display panel has a plurality of first electrodes and a plurality of second electrode.Drive plate is applied to second electrode with drive waveforms, thus plasma display panel display image thereon, and when image is displayed on plasma display panel, first electrode is biased in first voltage.Chassis and plasma display panel are relatively placed.
Described drive plate is carried out at least one height field a plurality of second electrodes is grouped into a plurality of groups that comprise first group and second group, described son has a plurality of addressing periods and a plurality of the keeping the cycle that corresponds respectively to a plurality of groups, and described drive plate is carried out the processing of selecting onunit in the middle of the unit first group and second group during the addressing period of each first group and second group.a plurality ofly keep in the cycle, provide between the addressing period first group addressing period and second group first keep the cycle during, drive plate is comprising by alternately applying second voltage and tertiary voltage to a plurality of second electrodes producing on a plurality of groups the unit of at least the first group and second group keeps discharge.Second voltage and tertiary voltage are respectively above and below first voltage.a plurality ofly keep in the middle of the cycle, after second group addressing period, provide second keep the cycle during, drive plate is comprising by alternately applying second voltage and tertiary voltage to a plurality of second electrodes producing on a plurality of groups the unit of at least the first group and second group subsequently keeps discharge.
Description of drawings
Fig. 1 is the decomposition diagram according to the plasma display equipment of exemplary embodiment.
Fig. 2 is the synoptic diagram according to the plasma display panel of exemplary embodiment.
Fig. 3 is the schematic top planimetric map according to the chassis of exemplary embodiment.
Fig. 4 is the driving method according to the plasma display equipment of first exemplary embodiment.
Fig. 5 is the oscillogram according to first exemplary embodiment.
Fig. 6 shows the driving method of plasma display panel, and it is divided into a plurality of groups with scanning electrode wire, and a frame is divided into a plurality of sons field.
Fig. 7 shows the sub-field structure according to second exemplary embodiment of the present invention.
The exemplary waveform that shows according to second exemplary embodiment of Fig. 8.
Fig. 9 shows another waveform according to second exemplary embodiment.
Embodiment
In the following detailed description, only simply illustrate and described some exemplary embodiment of the present invention by illustrating.Those of ordinary skill in the art should recognize that described embodiment can revise in various mode, and does not deviate from the spirit or scope of the present invention.Therefore, in fact accompanying drawing and explanation are considered to diagrammatic rather than restrictive.Reference numeral identical in the whole instructions is represented components identical.
The wall electric charge of mentioning in describing below is meant that the wall (for example, dielectric layer) at the electrode that approaches discharge cell upward forms and charges accumulated.The wall electric charge will be described to by " formation " or " accumulation " on electrode, although wall electric charge actual contact electrode not.And wall voltage can be represented the electric potential difference that forms by the wall electric charge on the wall of discharge cell.
Describe in detail below with reference to the accompanying drawings according to the plasma display equipment of exemplary embodiment and the driving method that is used for plasma display panel.
At first, referring to figs. 1 to 3 schematic construction of describing in detail according to the plasma display equipment of exemplary embodiment.
Fig. 1 is the decomposition diagram according to the plasma display equipment of exemplary embodiment, and Fig. 2 is the synoptic diagram according to the plasma display panel of exemplary embodiment.Fig. 3 is the schematic top planimetric map according to the chassis of exemplary embodiment.
As shown in Figure 1, plasma display equipment comprises plasma display panel 10, chassis 20, fore shell 30 and back cover 40.Chassis 20 and plasma display panel 10 combinations, and show to be sidelong with respect to the image of plasma display panel 10 and put.Be placed on the front portion of plasma display panel 10 and the rear portion on chassis 20 respectively, fore shell 30 and back cover 40 make up to form plasma display equipment with plasma display panel 10 and chassis 20 respectively.
As shown in Figure 2, plasma display panel 10 comprises a plurality of addressing electrode A1-Am that prolong in vertical direction and a plurality of scan electrode Y1-Yn that each prolongs in the horizontal direction and keeps electrode X1-Xn.Keep electrode X1-Xn and be formed and correspond respectively to scan electrode Y1-Yn, and the end of keeping electrode X1-Xn connects altogether.In addition, plasma display panel 10 comprises having keeping and the dielectric base (not shown) of scan electrode X1-Xn and Y1-Yn and another dielectric base (not shown) with the addressing electrode A1-Am that forms of forming thereon thereon.Mutually form two dielectric base of discharge space, and addressing electrode A1-Am is vertical and cross scan electrode Y1-Yn and keep electrode X1-Xn with insertion in the face of ground.Discharge space is formed at addressing electrode A1-Am and intersects at the zone of keeping with scan electrode X1-Xn and Y1-Yn, and so discharge space forms unit 12.
As shown in Figure 3, on chassis 20, be formed for driving the drive plate 100-500 of plasma display panel 10.Can be formed single plate or a plurality of plate at the addressing buffer board 100 shown in the upper and lower on chassis 20.Note, Fig. 3 schematic illustration the plasma display equipment that drives by two driving methods.Under the situation of the plasma display equipment that is driven by single driving method, addressing buffer board 100 is placed on the top or the bottom on chassis 20.This addressing buffer board 100 receives the addressing drive control signal from Flame Image Process and control panel 400, and will be used to select the voltage of conducting discharge cell (that is, with the discharge cell that is switched on) to be applied to addressing electrode A1-Am.
Turntable driving plate 200 is placed on the left side on chassis 20, and by scanning buffer plate 300 and scan electrode Y1-Yn coupling.Keep electrode X1-Xn and be biased in predetermined voltage.During addressing period, scanning buffer plate 300 is applied to scan electrode Y1-Yn with voltage, in order to its Continuous Selection.Turntable driving plate 200 receives drive signal from Flame Image Process and control panel 400, and driving voltage is applied to scan electrode Y1-Yn.In Fig. 3, turntable driving plate 200 and scanning buffer plate 300 are depicted as the left side that is placed on chassis 20, yet they can be placed on its right.In addition, scanning buffer plate 300 can integrally form with turntable driving plate 200.
Flame Image Process and control panel 400 receive external image signal, generation is used to drive the control signal of addressing electrode A1-Am and is used for driven sweep and keeps the control signal of electrode Y1-Yn and X1-Xn, and they are applied to addressing drive plate 100 and turntable driving plate 200 respectively.Power panel 500 is provided for driving the electric energy of plasma display equipment.Flame Image Process and control panel 400 and power panel 500 can be positioned at the central area on chassis 20.
Hereinafter will describe the method that is used to drive plasma display equipment in detail with reference to figure 4 according to first exemplary embodiment of the present invention.
Fig. 4 shows the method that is used to drive according to the plasma display equipment of first exemplary embodiment of the present invention.
As shown in Figure 4, according to first exemplary embodiment,, keep discharge in generation synchronously during the cycle of keeping, in each unit after the first sweep trace Y1 carries out addressing operation successively to last sweep trace Yn.As shown in Figure 4, one is divided into a plurality of son SF1-SF8, has each weighted value 1T, 2T, 4T, 8T, 16T, 32T, 64T and 128T.Described son field was controlled by the time-division, thus expression gray scale (gray scale).Each of a son SF1 to SF8 comprises reset cycle (not shown), addressing period Ad1-Ad8 and keeps cycle S1-S8.
Hereinafter will be described with reference to Figure 5 the drive waveforms that is used for according to the driving method of the plasma display panel of first exemplary embodiment.
Fig. 5 is the oscillogram that is used for according to the driving method of first exemplary embodiment.In the following description, understand and convenient the description, only describe the drive waveforms that is applied to scan electrode (hereinafter being called the Y electrode), keeps electrode (hereinafter being called the X electrode) and addressing electrode (hereinafter being called the A electrode) in conjunction with a unit for better.In addition, in drive waveforms shown in Figure 5, the voltage that is applied to the Y electrode provides from turntable driving plate 200 and scanning buffer plate 300, and the voltage that is applied to the A electrode provides from addressing buffer board 100.Because the X electrode is biased in reference voltage (ground voltage among Fig. 5), therefore be not described in detail the voltage that is applied to the X electrode.
Comprise reset cycle, addressing period and keep the cycle that with reference to 5, one in figure wherein the reset cycle comprises rising cycle and decline cycle.
During the rising cycle of reset cycle, when keeping the A electrode and being reference voltage (0V among Fig. 5), the voltage of Y electrode is increased to voltage Vset gradually from voltage Vs.The voltage that Fig. 5 illustrates the Y electrode increases according to tilt mode (ramp pattern).When the voltage of Y electrode increases, between Y and the X electrode and between Y and A electrode weak discharge is taking place.Therefore, on the Y electrode, form negative (-) wall electric charge, and on X electrode and A electrode, form just (+) wall electric charge.When the voltage of Y electrode changed as shown in Figure 5 gradually, the weak discharge that takes place on the unit formed the wall electric charge, thereby outside voltage and the wall electric charge sum that applies can be maintained discharge igniting voltage.The processing of this formation wall electric charge is disclosed in the U.S. Patent No. 5745086 of Weber.Voltage Vset is the voltage that discharges in the unit of high any condition that is enough to light a fire, because each unit must be initialised in the reset cycle.In addition, voltage Vs equals to be applied to the voltage of Y electrode in the cycle of keeping, and is lower than Y and X electric discharge between electrodes ignition voltage.
During the decline cycle of reset cycle, when keeping the A electrode at reference voltage, the voltage of Y electrode reduces to negative voltage Vnf gradually from voltage Vs.When the voltage of Y electrode reduces, between Y and the X electrode and between Y and A electrode weak discharge is taking place.Therefore, eliminated and forming negative (-) wall electric charge on the Y electrode and on X electrode and A electrode, forming just (+) wall electric charge.Voltage Vnf is set to usually and approaches Y and X electric discharge between electrodes ignition voltage.Then, the wall voltage between Y and the X electrode becomes near 0V, therefore, during the cycle of keeping, can prevent that the discharge cell that does not experience address discharge in addressing period from misfiring.In addition, the wall voltage between Y and the A electrode is determined by the level of voltage Vnf, because the A electrode maintains reference voltage.
During being used to select the addressing period of onunit, the addressing pulse of the scanning impulse of negative voltage VscL and positive voltage Va is applied to the Y and the A electrode of onunit respectively.Xuan Y electrode is not biased in the voltage VscH that is higher than voltage VscL, and reference voltage is applied to the A electrode by unit (for example, with the unit that is cut off).Here, voltage VscL is known as scanning voltage, and voltage VscH is known as non-scanning voltage.
For described operation, scanning buffer plate 300 selects to be applied in the Y electrode of scanning impulse VscL in the middle of Y electrode Y1 to Yn.For example, in single driving method, can select the Y electrode according to putting in order of the Y electrode on the vertical direction.
When selecting the Y electrode, addressing buffer board 100 is selected onunit in the middle of the unit that forms on the selected Y electrode.Just, addressing buffer board 100 selects to be applied with the A electrode of the addressing pulse of voltage Va in the middle of A electrode A 1 to Am.
More specifically, at first the scanning impulse of voltage VscL is applied to the scan electrode (Y1 shown in Figure 2) of first row, and simultaneously, the addressing pulse of voltage Va is applied to the A electrode of the onunit in first row.Then, at the Y electrode of first row be applied with and produce discharge between the A electrode of voltage Va, and therefore, on the Y electrode, form just (+) wall electric charge, and on A and X electrode, form negative (-) wall electric charge.As a result, between X and Y electrode, form wall voltage Vwxy, thereby the electromotive force of Y electrode becomes and is higher than the electromotive force of X electrode.Subsequently, when the scanning voltage with voltage VscL is applied to Y electrode (Y2 among Fig. 2) in second row, the addressing pulse of voltage Va is applied to the A electrode of onunit in second row.Then, in unit, produce address discharge, and therefore, in such unit, form the wall electric charge in the same manner described above by the Y electrode crossing in the A electrode that is applied with voltage Va and second row.About the Y electrode in other row, when the scanning impulse with voltage VscL is applied to the Y electrode successively, with same way as described above, that is, be applied to the A electrode of onunit and in onunit, form the wall electric charge by addressing pulse with voltage Va.
In such addressing period, the level of voltage VscL is less than or equals the level of voltage Vnf usually, and voltage Va is set to usually greater than reference voltage.Hereinafter equal the situation description of voltage Vnf by voltage Va being applied to the generation of the address discharge of A electrode in conjunction with voltage VscL.When in the reset cycle, applying voltage Vnf, the wall voltage between A and Y electrode and reach A and Y electric discharge between electrodes ignition voltage Vfay.When the A electrode be applied in 0V and Y electrode be applied in voltage VscL (=Vnf) time, between A and Y electrode, form voltage Vfay, and therefore can expect to produce discharge.Yet, in fact, in this case, because discharge delay greater than the width of scanning impulse and addressing pulse, does not therefore produce discharge.Yet, if voltage Va is applied to the A electrode, while voltage VscL (=Vnf) be applied to the Y electrode, between A and Y electrode, form voltage, so discharge delay is reduced to less than the width of scanning impulse greater than voltage Vfay.Therefore, in this case, can produce discharge.At this moment, can be so that the generation of address discharge by voltage VscL is set at less than voltage Vnf.
Subsequently in the cycle of keeping, initially be applied to the Y electrode, between Y and X electrode, trigger and keep discharge by pulse voltage Vs, this be because, in addressing period in the unit of experience address discharge, form wall voltage Vwxy, thereby the electromotive force of Y electrode is higher than the electromotive force of X electrode.In this case, voltage Vs is set at is lower than discharge igniting voltage Vfxy, and magnitude of voltage Vs+Vwxy is higher than voltage Vfxy.As such result who keeps discharge, on the Y electrode, form negative (-) wall electric charge, and on X and A electrode, form just (+) wall electric charge, thereby the electromotive force of X electrode is higher than the electromotive force of Y electrode.
Thereby become and be higher than the X electrode because formed the electromotive force of wall voltage Vwxy Y electrode, therefore the pulse with negative voltage-Vs is applied to the Y electrode, so as igniting subsequently keep discharge.Therefore, on the Y electrode, form just (+) wall electric charge, and on X and A electrode, form negative (-) wall electric charge, thereby can light a fire by voltage Vs being applied to the Y electrode that another keeps discharge.Subsequently, repeat with voltage Vs and-Vs keep processing that pulse alternately is applied to scan electrode Y number of times (times) corresponding to the weighted value of corresponding son.
As mentioned above, according to first exemplary embodiment, when the X electrode is biased in reference voltage, can carry out by the drive waveforms that only is applied to the Y electrode reset, addressing and keep operation.Therefore, do not need to be used to drive the drive plate of X electrode, and the X electrode can be by simple bias at reference voltage.In addition, only be applied to the Y electrode, therefore can prevent because the waveform distortion that parasitic component causes owing to keep pulse.
In order to drive plasma display equipment according to first exemplary embodiment, carry out addressing operation successively from a Y electrode Y1 to last Y electrode Yn, as shown in Figure 4, and after the operation of conducting or sequential addressing is finished, in each selected cell, produce synchronously and keep discharge.In other words, when on a Y electrode, carrying out addressing operation, only in the end carry out after the addressing operation on the Y electrode, on the Y electrode, produce and keep discharge.Therefore, the time slot between the generation of keeping discharge on addressing operation and the unit can be looked is enough to make the generation instability of keeping discharge.
Hereinafter with reference Fig. 6 to 9 describe according to second exemplary embodiment of the present invention, be used to solve the driving method that top problem provides.
Hereinafter, with the detailed method of describing driving plasma display equipment of second exemplary embodiment with reference to figure 6 and 7 according to the present invention.
As shown in Figure 6, scanning electrode wire is grouped into n group G1 to Gn, and the frame of each group is divided into a plurality of son, is used to drive plasma display equipment.In Fig. 6, each group uses the combination of 8 son fields to represent gray-scale value.
When scan electrode is grouped into a plurality of groups, can divide into groups successively to the scan electrode of determined number.For example, when flat board had 800 scan electrodes, these 800 scan electrodes were grouped into 8 groups successively, and first to the 100th scan electrode can be grouped into first group, and the 101st to the 200th scan electrode can be grouped into second group etc.In another embodiment, when the grouping scan electrode, the conventional scan electrode at interval of spacing can be grouped, rather than the adjacent scan electrode that divides into groups successively.In other words, first, the 9th, the 17 ..., (8k+1) scan electrode is grouped into first group, and second, the tenth, the 18 ..., (8k+2) scan electrode is grouped into second group etc.Also random packet scan electrode on demand.
Fig. 7 shows the sub-field structure that is used for according to the driving method of second exemplary embodiment of the present invention.Particularly, Fig. 7 shows the structure that is grouped into next height field (SF1) of situation of 4 groups G1, G2, G3 and G4 at the scan electrode of plasma display panel.A son SF1 comprises reset cycle R, addressing/keep combined cycle T1, public period T 2 and the gamma correction period T 3 kept.
Reset cycle R is used for by reset wave being applied to the state that each scan electrode comes the wall electric charge of each unit of initialization.
During addressing/keep combined cycle T1, from the first electrode Y of group G1 11To final electrode Y 1mCarry out addressing operation A successively G1When addressing operation A has been carried out in each unit among first group of G1 G1The time, keep cycle S first 11During this time, operation is kept in execution on each unit of first group of G1.
Keep cycle S having finished for first of first group of G1 11Afterwards, at addressing period A G2During this time, on each unit of second group of G2, carry out addressing operation A G2
At the addressing period A that has finished for second group of G2 G2Afterwards, the scan electrode Y that just works as second group of G2 21, Y 22..., Y 2mWhen being addressed, on second group of G2, carrying out first and keep cycle S 21Operation.At this moment, experience addressing period A G1First group of G1 go up to carry out second and keep cycle S 12Operation.Yet, if keep cycle S first 11First group of gray-scale value of being satisfied with during this time, then needn't carry out for first group second keep cycle S 12Operation.The unit that does not experience addressing period maintains the state that ends.
Keep cycle S when having finished for first of second group of G2 21The time, on the 3rd group of G3, carry out addressing period A in the same manner described above G3With first keep cycle S3 1Operation, and on the 3rd group of G3, carry out first and keep cycle S 31Operation time, can carry out for keeping cycle S experiencing on first and second groups of addressing period 13And S 22Operation.Yet, if keep cycle S first 11And S 21First and second groups of gray-scale values of being satisfied with then do not need to carry out for keeping cycle S during this time 13And S 22Additional operations.
Carry out for addressing period A on the 4th group of G4 in top identical mode G4With first keep cycle S 41Operation, and on the 4th group of G4, carry out first and keep cycle S 41Operation time, can carry out for keeping cycle S on each unit in experiencing first, second and the 3rd group of G1, G2 and G3 of addressing period 14, S 23And S 32Operation
Carry out on the exemplary unit that shows in other are organized of Fig. 7 to carry out on the unit in the group that experiences addressing period when keeping cycleoperation and keep cycleoperation.Be applied in the brightness of keeping pulse and therefore producing same amount of same amount if suppose each cycle of keeping, the unit in first group can produce the bright n of the brightness brightness doubly that produces than the unit in the n group.Equally, the unit in second group can produce than the unit in the n group and produce brightness bright (n-1) brightness doubly, and the unit in G (n-1) group can produce the bright 2 times brightness of brightness that produces than the unit in the n group.Therefore, need gamma correction equally to proofread and correct luminance difference in every group in addition.
In order will equally to proofread and correct to equating, gamma correction period T 3 is carried out on every group selection ground by the gray-scale value that the unit in every group is represented.
Public keep period T 2 be used for for preset time section be applied to cycle of each unit with will keeping impulsive synchronization, and when gray-scale value of distributing to each son during addressing/keep combined cycle T1 or addressing/keep combined cycle T1 and gamma correction period T 3 may not represented satisfactorily, the described public period T 2 of keeping can be to select to carry out.As shown in Figure 7, after carrying out addressing/keep combined cycle T1, perhaps after carrying out gamma correction period T 3, can carry out the public period T 2 of keeping.
In addition, the weighted value according to the son field can change the public length of keeping period T 2.
In addition, son can be only by addressing/keep combined cycle T1 to realize.More specifically, after on one group, finishing addressing and keeping operation, carry out addressing successively and keep operation to next continuous group.Carry out addressing/keep cycleoperation successively from four groups of G4 of first group of G1 to the.
The exemplary drive waveforms that shows according to the driving method of second exemplary embodiment of Fig. 8.Fig. 8 shows the drive waveforms figure of plasma display equipment.According to the driving method of Fig. 6 and Fig. 7, described waveform is applied to the scan electrode (Yodd electrode) of odd number group, the scan electrode (Yeven electrode) and the X electrode of even number set.
Different with Fig. 6 and Fig. 7, Fig. 8 shows the Y electrode and is grouped into odd number group and even number set.
During reset cycle R, reset wave is respectively applied to Yodd and the Yeven electrode in odd number group and the even number set, so that the state of the wall electric charge in the initialization unit.The reset wave of Fig. 8 is identical with the waveform of Fig. 5, therefore, no longer provides detailed description.
During addressing/keep combined cycle T1, carry out addressing period Aodd on the Yodd electrode that at first in odd number group, divides into groups, and carry out thereon and keep cycle Sodd.Carry out on the Yodd electrode in odd number group and keep after the cycle Sodd, carry out addressing period Aeven on the Yeven electrode that in even number set, divides into groups.Then, synchronously carry out second respectively on Yodd electrode in odd number group and the Yeven electrode in the even number set and keep cycle S 12Cycle S is kept in operation and first 21Operation.
More specifically, during addressing/keep combined cycle T1, the Yodd electrode in the odd number group at first experiences addressing period Aodd operation.During addressing period Aodd, the Yeven electrode in even number set is maintained in the voltage VscH, and the scanning impulse of voltage VscL is applied to Yodd electrode in the odd number group successively.In addition, although not shown in Fig. 8, addressing voltage is applied to the A electrode in the onunit (with the unit that is switched on) in the middle of the unit that is formed by the Y electrode that is applied with scanning impulse.Therefore voltage difference between addressing voltage by being applied to the A electrode and the voltage VscL that is applied to the Y electrode and because the wall voltage that the wall electric charge that forms on A and the Y electrode causes produces address discharge, forms wall voltage between Y and X electrode then.
Addressing/keep combined cycle T1 keep cycle Sodd during, when the X electrode is biased in reference voltage, will keeps pulse and be applied to Yodd and Yeven electrode.With reference to figure 8, keep pulse and be applied to Yodd and Yeven electrode once.In addition, keep pulse have high level voltage (Vs among Fig. 8) and low level voltage (among Fig. 8-Vs), and because wall voltage and Vs voltage or-Vs voltage can produce and keep discharge.When the X electrode was biased in reference voltage (0V among Fig. 8), Yodd and Yeven electrode be applied in voltage Vs.Between Yodd electrode and X electrode, forming in the unit of wall voltage owing to address discharge during the addressing period Aodd, wall voltage and the voltage difference Vs between Yodd electrode and X electrode cause and keep discharge, therefore form the wall voltage of opposite polarity in Yodd electrode and X electrode respectively.On the other hand, although the pulse of keeping during the cycle Sodd voltage Vs of keeping at addressing/keep combined cycle T1 is applied to Yeven electrode in the even number set, but in discharge cell, do not produce and keep discharge, because between the X of Yeven electrode and even number set electrode, do not form wall voltage.Carry out addressing period Aodd on the Yodd electrode in odd number group and keep after the cycle Sodd, carry out addressing/keep the addressing period Aeven of combined cycle T1 and keep cycle Seven on the Yeven electrode in even number set successively.
When the Yodd electrode of odd number group was maintained at voltage VscH during the addressing period Aeven of addressing/keep combined cycle T1, the Yeven electrode of even number set was applied with the scanning impulse of voltage VscL successively.As mentioned above, addressing voltage is applied to the Aeven electrode of the onunit in the middle of the unit that forms by the Y electrode that is applied with voltage VscL, and therefore, forms wall voltage.Notice, keep cycle Sodd and in Fig. 8, separate, addressing period Aven but these two cycles can overlap with addressing period Aeven.
In addition, addressing/keep combined cycle T1 keep cycle Seven during, when the X electrode is biased in reference voltage (0V), will keeps pulse and be applied to Yodd and Yeven electrode.Be similar to the pulse of keeping that during keeping cycle Sodd, applies, keep pulse have high level voltage (Vs among Fig. 8) and low level voltage (among Fig. 8-V), and because wall voltage and Vs voltage or-Vs voltage, can produce and keep discharge.Note, in the unit that has experienced addressing period Aeven, produced and kept discharge, therefore in the middle of the unit that the Yeven electrode by even number set forms, form wall voltage thereon.Yet, be also noted that, when just forming (+) wall electric charge thereon, when during the cycle of the keeping Seven high level voltage being applied to the unit, having formed during the addressing period Aodd therein to produce in the unit in the middle of the unit of the Yodd of odd number group electrode of wall voltage and kept discharge.
Public keep period T 2 during, the pulse of keeping that will have high level voltage and low level voltage alternately is applied to Yodd and Yeven electrode, and the X electrode is biased in reference voltage (0V), thus common the execution kept operation on Yodd and Yeven electrode.
Therefore, in the son field of Fig. 8, on the Yeven of the Yodd of odd number group electrode and even number set electrode, carry out 6 times discharge operation respectively,
According to the son of Fig. 8, do not need additional gamma correction period T 3 shown in Figure 7 because during addressing/keep combined cycle T1, in the Yeven electrode of the Yodd of odd number group electrode and even number set, produced identical quantity and kept discharge.
Yet, in the drive waveforms of Fig. 8, during addressing/keep combined cycle T1, on the Yeven of even number set electrode, carry out in the addressing period Aeven, can in the Yodd of odd number group electrode, misfire.
In other words, when when keeping during the cycle Sodd of addressing/keep combined cycle T1 is applied to the Yodd electrode of odd number group with high level voltage, negative (-) wall electric charge is accumulated to the Yodd electrode of odd number group.
Then, during addressing period Aeven, the voltage VscH that is applied to the Yodd electrode of odd number group is lower than the voltage (0V among Fig. 8) that is applied to the X electrode, therefore, because the Yodd electrode of odd number group and the voltage difference VscH between the X electrode can misfire in the unit of the big wall voltage of formation between the Yodd of odd number group electrode and X electrode therein.
Therefore, when when misfiring in the unit on the Yodd of odd number group electrode during the addressing period Aeven, it is unstable that the brightness of odd number group becomes, and is not generated as identical quantity because keep the quantity of discharge in the Yodd electrode of the Yeven of even number set electrode and odd number group.Hereinafter be described with reference to Figure 9 another drive waveforms that is used to solve top problem.
Fig. 9 example illustration has illustrated the waveform according to another driving method of second exemplary embodiment.As shown in Figure 9, son field comprises reset cycle R, addressing/keep combined cycle T1, public period T 2 and the gamma correction period T 3 kept.To keep period T 2 different with Fig. 7 public, the public period T 2 of keeping of execution graph 9 after carrying out gamma correction period T 3.
Reset cycle R comprises rising cycle and decline cycle, and by reset wave being applied to the state that each Yodd and Yeven electrode come the wall electric charge of initialization unit.The reset wave of Fig. 9 is identical with Fig. 5's, therefore is not described in detail.Be similar to Fig. 8, when the X electrode is biased in reference voltage (0V among Fig. 9), during addressing/keep combined cycle T1, on the Yodd of odd number group electrode, at first carry out addressing period Aodd operation and keep cycle Sodd operation, and on the Yeven of even number set electrode, carry out addressing period Aeven operation and keep cycle Seven operation.
As shown in Figure 9, different with the drive waveforms of Fig. 8, during keeping cycle Sodd, the Yodd electrode of odd number group and the Yeven electrode of even number set by be applied with respectively high level voltage (Vs among Fig. 9) and low level voltage (among Fig. 9-Vs) once.
The last voltage that is applied to the Yodd electrode of odd number group is-Vs voltage that therefore, just (+) wall electric charge is accumulated to the Yodd electrode of odd number group.Be lower than the voltage (0V among Fig. 9) that is applied to the X electrode because be applied to the voltage VscH of the Yodd electrode of odd number group, therefore between the Yodd of odd number group electrode and X electrode, do not misfiring during the cycle Aeven.
In addition, owing on the Yodd of odd number group electrode, accumulated just (+) wall electric charge, when high level voltage being applied to each Yodd and Yeven electrode, in the Yodd of the Yeven of even number set electrode and odd number group electrode, producing and keep discharge.
Therefore, different with Fig. 8, in Fig. 9, each the Yodd electrode in the odd number group and each the Yeven electrode experience in the even number set are kept discharge.
As a result, the quantity of keeping discharge is different for the Yeven electrode of the Yodd electrode of odd number group and even number set, and therefore, it is described poor to provide gamma correction period T 3 to proofread and correct.
Gamma correction period T 3 is the discharge cycles of keeping for each group selection execution, therefore organizes gray-scale value quilt correction equally of expression for equal by each.
In other words, keeping discharges only to be set to produces in the Yeven of even number set electrode, therefore the Yodd electrode of odd number group during gamma correction period T 3 not experience keep discharge, thereby identical by the become brightness of the unit generation that forms with the Yeven electrode that passes through by even number set of the brightness that the unit that the Yodd electrode by odd number group forms produces.
Therefore, as shown in Figure 9, during gamma correction period T 3, the Yeven electrode of even number set has been applied in-Vs voltage, and the Yodd electrode of odd number group has been applied in voltage Vc, and it has and is higher than-voltage level of Vs voltage.Then, the voltage difference between the Yodd electrode of odd number group and the Yeven electrode of even number set reduces, thereby the Yeven electrode of even number set experience is kept discharge.Then, voltage Vs is applied to the Yodd electrode of odd number group and the Yeven electrode of even number set.Then, negative (-) wall electric charge of accumulation on the Yodd of odd number group electrode was not kept discharge because the Yodd electrode of odd number group experiences in the past, kept discharge and only produce in the Yeven of even number set electrode.
Like this, in the Yodd of odd number group electrode, produce during the gamma correction period T 3 keep discharge quantity be restricted to during addressing/keep combined cycle T1, in the Yeven of even number set electrode, produce keep discharge quantity.Therefore, the brightness of the Yodd electrode of odd number group equals the brightness of the Yeven electrode of even number set.
Public keep period T 2 during, keep pulse and be applied to the Yodd electrode of odd number group and the Yeven electrode of even number set, and therefore, the common execution kept discharge on Yodd and Yeven electrode.
As mentioned above, when keeping electrode and being maintained constant voltage, only drive waveforms is applied to scan electrode.Therefore, can realize compoboard by single plate driving, and therefore, owing to having used single plate to reduce cost.
In addition, under the situation of not using additional driver circuit, can carry out the driving of the unit that forms display board for each electrode that forms the unit.In addition, when not using additional driver circuit to drive the unit of each electrode and using that frame-when sub-field method was represented gray-scale value, the time slot between the minimizing addressing cycle and the cycle of keeping was so that improve the generation of keeping discharge.
Although described the present invention in conjunction with being considered to actual exemplary embodiment at present, but be to be understood that, the invention is not restricted to the disclosed embodiments, on the contrary, covered various modifications and equivalent structure within the spirit and scope that are included in claims and equivalent thereof.

Claims (19)

1. driving method that a frame is divided into the plasma display equipment of a plurality of son, described plasma display equipment has a plurality of first electrodes and a plurality of second electrode, described a plurality of second electrode is grouped into a plurality of groups that comprise first group and second group, in at least one comprised a plurality of addressing periods of corresponding respectively to a plurality of groups and a plurality of son of keeping the cycle, described driving method comprised:
During a plurality of addressing periods, from discharge cell, select onunit corresponding to first group and second group;
During a plurality of first in the middle of cycles of keeping are kept the cycle, when a plurality of first electrodes are biased in first voltage, keeping discharge by alternately apply second voltage and tertiary voltage to a plurality of second electrodes corresponding to comprising producing in first group a plurality of groups the discharge cell, wherein, first cycle of keeping was provided between a plurality of addressing periods of first group and second group, and wherein second voltage and tertiary voltage are respectively above and below first voltage; With
After a plurality of addressing periods of second group, provide second keep the cycle during, when a plurality of first electrodes are biased in first voltage, are comprising by alternately applying the 4th voltage and the 5th voltage producing in a plurality of groups the unit of at least the first group and second group and keeping discharge to a plurality of second electrodes.
2. driving method as claimed in claim 1, wherein, during a plurality of addressing periods of first group and second group, described a plurality of first electrodes are biased in first voltage.
3. driving method as claimed in claim 2 wherein, is set to tertiary voltage at the first last voltage that applies during keeping the cycle.
4. driving method as claimed in claim 3, also comprise step: when a plurality of first electrodes are biased in first voltage during second keeps the cycle, apply at least once greater than the 4th voltage and less than the 6th voltage of the 5th voltage to first group second electrode.
5. driving method as claimed in claim 4, wherein, when the 6th voltage was applied to first group second electrode, second group second electrode had been applied in the 5th voltage.
6. driving method as claimed in claim 4, wherein, got rid of apply the 6th voltage cycle beyond second keep the cycle during, the 4th voltage and the 5th voltage alternately are applied to a plurality of second electrodes.
7. driving method as claimed in claim 4, wherein, because the 6th voltage is applied to first group second electrode and after the 6th voltage the 7th voltage be applied to first group second electrode, do not keep discharge so do not produce in the discharge cell on first group second electrode.
8. driving method as claimed in claim 1, wherein, described first voltage is set to ground voltage.
9. driving method as claimed in claim 1, wherein, described second voltage has identical size and opposite polarity with tertiary voltage,
Wherein, the 4th voltage has identical size and opposite polarity with the 5th voltage,
Wherein, second voltage has identical voltage level with the 4th voltage; With
Wherein, tertiary voltage has identical voltage level with the 5th voltage.
10. driving method as claimed in claim 1, wherein, a plurality of each that keep in the cycle comprise and are used on every group the common common period of keeping one period cycle preset time of discharge of carrying out.
11. a plasma display equipment comprises:
Plasma display panel, it has a plurality of first electrodes and a plurality of second electrode;
Drive plate is used for drive waveforms is applied to second electrode, thus plasma display panel display image thereon, and when image is displayed on plasma display panel, first electrode is biased in first voltage; With
The chassis, itself and plasma display panel are relatively placed,
Wherein, described drive plate is carried out at least one height field a plurality of second electrodes is grouped into a plurality of groups that comprise first group and second group, and has a plurality of addressing periods and a plurality of the keeping the cycle that corresponds respectively to a plurality of groups;
During a plurality of addressing periods of first group and second group, in the middle of the unit of first group and second group, select onunit;
Provide between the addressing period of first group addressing period and second group first keep the cycle during, comprising by alternately applying second voltage and tertiary voltage producing on a plurality of groups the unit of at least the first group and second group and keeping discharge to a plurality of second electrodes, wherein, second voltage and tertiary voltage are respectively above and below first voltage; With
After second group addressing period, provide second keep the cycle during, comprising by alternately applying second voltage and tertiary voltage producing on a plurality of groups the unit of at least the first group and second group and keeping discharge to a plurality of second electrodes.
12. plasma display equipment as claimed in claim 11 wherein, is a tertiary voltage at the first last voltage that applies during keeping the cycle.
13. plasma display equipment as claimed in claim 12, second keep the cycle during, apply greater than second voltage and at least once to first group second electrode less than the 4th voltage of tertiary voltage.
14. plasma display equipment as claimed in claim 13, wherein, when applying the 4th voltage, tertiary voltage is applied to second group second electrode.
15. plasma display equipment as claimed in claim 13, wherein, got rid of apply the 4th voltage cycle beyond second keep the cycle during, second voltage and tertiary voltage alternately are applied to a plurality of second electrodes.
16. plasma display equipment as claimed in claim 13, wherein, because the 4th voltage is applied to first group second electrode and the 4th voltage after the 5th voltage be applied to first group second electrode, do not keep discharge so in the discharge cell of second electrode formation by first group, do not produce.
17. plasma display equipment as claimed in claim 11, wherein, described first voltage is ground voltage.
18. plasma display equipment as claimed in claim 11, wherein, described second voltage has identical size with tertiary voltage but polarity is opposite.
19. plasma display equipment as claimed in claim 11, wherein, the third dimension cycle of holding comprises and is used on every group the common common period of keeping one period cycle preset time of discharge of carrying out.
CNB2005101247854A 2004-11-15 2005-11-15 Plasma display device and driving method thereof Expired - Fee Related CN100495502C (en)

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CN100485754C (en) * 2005-06-24 2009-05-06 乐金电子（南京）等离子有限公司 Plasma display driving device and driving method

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KR100787445B1 (en) * 2006-03-03 2007-12-26 삼성에스디아이 주식회사 Driving method of plasma display panel
KR100759463B1 (en) * 2006-04-20 2007-09-20 삼성에스디아이 주식회사 Plasma display and driving method thereof
KR100839386B1 (en) 2007-03-26 2008-06-20 삼성에스디아이 주식회사 Plasma display and driving method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100485754C (en) * 2005-06-24 2009-05-06 乐金电子（南京）等离子有限公司 Plasma display driving device and driving method

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