CN1445739A - Plasma display device - Google Patents

Abstract

The present invention provides a plasma panel display device having high luminous efficiency. The plasma panel display device has at least addressing period and holding period for luminous display to drive, during above holding period, pulse applying period and interval period are provided, during the pulse applying period before the interval period, the electrode voltage of above holding electrode is set to be Vsp relative to the voltage of ground applying positive voltage, and another electrode voltage is set to be Vsn, during above interval period, Vsp-Vsn has apparent negative value, and discharge luminescence is provided during above interval period.

Description

Plasma display system

Technical field

The present application is plasma display system and the driving method thereof about a kind of employing plasma display panel (Plasma Display Panel: hereinafter referred to as PDP).The present application is effective to improving ultraviolet luminous efficiency and improving luminescence efficiency particularly.

Background technology

Recently, as large-scale slim color monitor, adopt the plasma display system of so-called ac plane discharge type PDP to enter a large amount of production phases.As the ac plane discharge type PDP that is called for short, be meant with ac driven plane discharge type PDP.

Figure 21 is the stereographic map of ac plane discharge type PDP one example of three electrode structures known so far.In ac plane discharge type PDP shown in Figure 21,2 sheet glass substrates, that is, front substrate 21 and back substrate 28 are in pairs to configuration, and gap therebetween becomes discharge space 33.In the discharge space, enclosing discharge gas pressure usually is more than hundreds of Torr.As discharge gas, be to use the mixed gas of He, Ne, Xe or Ar etc. in general.

Below the front substrate 21 of display surface, main formation kept electrode pair (also be called keep sparking electrode to), is used to show the luminous discharge (also be called and keep discharge) of keeping.This keeps discharge to being called X electrode, Y electrode.Usually, X electrode and Y electrode are made of transparency electrode and the opaque electrode that remedies transparency electrode electric conductivity.That is, X electrode 34 is by X transparency electrode 22-1,22-2 ... with opaque X bus electrode 24-1,24-2 ... constitute, Y electrode 35 is by X transparency electrode 23-1,23-2 ... with opaque Y bus electrode 25-1,25-2 ... constitute.In addition, most applications is that the X electrode is a common electrode, and the Y electrode is an absolute electrode.Usually, the discharging gap Ldg of X, Y electrode wants narrow its discharge ionization voltage that makes not high, will design widelyer in abutting connection with gap L ng, prevents and misplacing in abutting connection with discharge cell.

These are kept electrode and are covered with front 26, the diaphragm 27 of this surface of 26 formation magnesium oxide (MgO) etc.Because MgO has anti-sputter, advantage that secondary electron yield is high, protection front 26, and reduce discharge ionization voltage.

On the other hand, above the back substrate 28, along with keep the address electrode (also be called and write electrode, address sparking electrode, A electrode) 29 that electrode (X electrode, Y electrode) vertical direction is provided for address discharge (also be called and write discharge).This A electrode 29 is got up by 30 linings of back side dielectric.On this back side dielectric 30, the position between A electrode 29 is provided with next door 31.And then, coating fluorophor 32 in by the wall in next door 31 and the recessed district that forms above the back side dielectric 30.In this structure, the cross part of keeping electrode pair and A electrode is corresponding to a discharge cell.And, two-dimentional shape configuration discharge cell.During colored the demonstration, 3 kinds of discharge cells of red, green coating, blue each fluorophor constitute a pixel as one group.

The sectional view of the discharge cell part of the arrow D1 direction of expression from Figure 21 among Figure 22, the sectional view of the discharge cell part of the arrow D2 direction of expression from Figure 21 among Figure 23.In addition, about Figure 23, elementary boundary is the position of representing with dotted line roughly.Among Figure 23, symbol 3 expression electronics, 4 expression positive ions, positive wall electric charge, the negative wall electric charge of 6 expressions of 5 expressions.

Then, relevant this routine PDP work is described.

The principle of luminosity of PDP is exactly, with add that pulse voltage causes discharge between X, Y electrode, by fluorophor, the discharge gas generation ultraviolet ray of excitation is transformed into visible light.

Figure 24 is that the substrate of expression PDP device constitutes block diagram.Above-mentioned PDP (also being called plasma display panel or panel) 100 plasma display system of packing into.Driving circuit 101 receives the displayed image signal of eikongen 103, is transformed into each electrode of drive voltage supply PDP100.The object lesson of this driving voltage of expression among Figure 25.

Width of cloth picture in the PDP is exactly the driving voltage and the sequential chart of a TV field interval of expression requirement shown in Figure 25 (a) expression Figure 21.Figure 25 (b) (also is called the address interdischarge interval, writes interdischarge interval) 50 during the address of Figure 25 (a), put on the voltage oscillogram on A electrode 29, X electrode 34 and the Y electrode 35.Figure 25 (c) is expression, the time of (also being called during keeping interdischarge interval, luminous demonstration) 51 during the keeping of Figure 25 (a) is simultaneously to as the graph of a relation of keeping the voltage that applies on pulse voltage (also be called keep the electrode pulse driving voltage, keep sparking voltage) and the address electrode that applies between the X electrode of keeping electrode and the Y electrode.

One TV field interval 40 is divided into son field 41～48 with a plurality of different number of light emission times.Is this state representation (I) among Figure 25 (a).

And, utilize the luminous and non-luminous selection of each son field, the performance tone.For example, when having overlapping 8 sons of briliancy according to the binary law setting, three primary colors show use discharge cell, and the briliancy that obtains 28 (=256) tone respectively shows that the look demonstration of 1,678 ten thousand colors is arranged approximately.

Each son field shown in Figure 25 (a) (II), has during following 3.The 1st is the recovery period (also be called and restore interdischarge interval) 49 that discharge cell is got back to original state, the 2nd is to select (also be called the address interdischarge interval, write interdischarge interval) 50 during the address of luminous discharge cell, and, the 3rd be keep during (also be called and keep during interdischarge interval, the luminous demonstration) 51.

Figure 25 (b) is illustrated in during the address of Figure 25 (a) 50, the voltage oscillogram that A electrode 29, X electrode 34 and Y electrode 35 are applied.Waveform 52 is 50 to give 1 voltage waveform that A electrode 29 adds during the address, and waveform 53 is the voltage waveforms that add to X electrode 34, and 54,55 is respectively the voltage waveform that i and (I+1) to Y electrode 35 add.Therefore, voltage separately is V1, V21 and V22 (V).

Shown in Figure 25 (b), give when the i of Y electrode 35 is capable to add scanning impulse 56, be positioned at the unit of voltage V0 and A electrode 29 intersection points, between Y electrode and the A electrode, then between Y electrode and the X electrode discharge in the generation address.The address discharge does not take place in the unit frame that is positioned at earthing potential and A electrode 29 intersection points.Give situation that (i+1) row of Y electrode adds scanning impulse 57 too.

Take place in the unit of address discharge, as shown in figure 23, on the surface of deielectric-coating 26 that covers X, Y electrode and diaphragm 27, form the electric charge (wall electric charge) that produces in the discharge, and wall voltage V takes place between X electrode and Y electrode _w(V).As above-mentioned, among Figure 23, symbol 3 expression electronics, 4 expression positive ions, the positive wall electric charge of 5 expressions, the negative wall electric charge of 6 expressions.Having or not of this wall electric charge, 51 keep having or not of discharge during continuing to keep below the decision.

Figure 25 (c) is expression, during the keeping of Figure 25 (a) 51 during, simultaneously to as the pulse voltage of keeping that applies between the X electrode of keeping voltage and the Y electrode.Add the pulse voltage of keeping of voltage waveform 58 on the X electrode, add the pulse voltage of keeping of voltage waveform 59 on the Y electrode.Magnitude of voltage all is V3 (V).Add the driving voltage of voltage waveform 60 on the A electrode 29, and keep certain voltage (V4) in during keeping.In addition, this voltage V4 is earth potential sometimes.By applying the pulse voltage of keeping of V3 voltage alternately, make the relative voltage between X electrode and the Y electrode repeat reversing.Set the magnitude of voltage of this V3, so that the having or not to decide and keep having or not of discharge of the wall voltage that causes by address discharge.

As for discharge cell the 1st potential pulse of address discharge generation, before having to a certain degree accumulation, the wall electric charge of discharge generation opposite polarity continues discharge.The result of this discharge, the wall voltage of being accumulated act on the potential pulse direction of supporting the 2nd reversing, discharge once more.The 3rd pulse later on too.Like this, between the X electrode and Y electrode of the discharge cell that the address discharge takes place, apply keeping of potential pulse a few minutes discharge cause luminous.On the contrary, do not produce in the discharge cell of address discharge not luminous.More than be the PDP device basic comprising and the driving method thereof of conventional example.

And,, can enumerate as follows as the relevant major technique that improves the driving method of luminescence efficiency.

(1) spy opens flat 11-65514.This is the applied voltage waveform that discharge takes place once to keep, and after applying low-voltage, applies enough high voltages under the discharge keeping in advance, and voltage for a long time.But applying of above-mentioned low-voltage is to be limited to the absence of discharge pulse that does not take place in the Discharge illuminating scope, just utilizes ignition action.

(2) spy opens 2001-13919 number.Here it is has the discharge pulse of keeping generation circuit, and it has by the inductance composition links the X electrode to the 1st voltage source, after applying the firing pulse switch of the crest value higher than the 1st voltage source and firing pulse and applying, applies the switch of 2nd voltage lower than above-mentioned crest value.But the pulse that is caused by above-mentioned inductance composition also is the effect that utilizes igniting (priming).

The feature of above conventional example is to carry out the two-stage and apply voltage keeping electrode, is that second section pulse takes place once when applying yet follow luminous discharge.That is, the two-stage keeps in the 1 stage pulse of pulse at least, and utilize to follow and keep discharge luminous between electrode, and, follow above-mentioned luminous discharge of the 1st stage because produce, just can not utilize the inductance composition.

Summary of the invention

Now, be to improve luminescence efficiency in order to popularize PDP as one of most important problem of televisor (TV).

The invention reside in to using the plasma display system of plasma display panel, a kind of technology of keeping Discharge illuminating efficient that driving method is thought hard improving is provided.

At first, the basic mechanism of raising luminescence efficiency that guarantees drive principle of the present invention is described.The basic physical principle of raising the efficiency is that in the discharge process of weak electric field (low discharge space voltage), electron temperature descends, thereby ultraviolet luminous efficiency rises.So the basis of technology is exactly the discharge space voltage when reducing discharge.Here, the absolute value of the difference of dielectric surface current potential that so-called discharge space voltage is the X electrode and Y electrode dielectric surface current potential, the actual exactly voltage that is added to discharge space.That is, discharge space voltage is to be added to the wall voltage sum that forms on the dielectric of keeping interelectrode voltage and X, Y electrode.In addition, above-mentioned discharge space voltage and generation ultraviolet relation itself, for example everybody knows according to paper J.Appl.Phys.88, pp.5605 (2000).

Basic consideration of the present invention aspect is as follows.

(1) the preposition discharge of during the gap, carrying out and then proceed to keep in two-stage at least of main discharge discharge (below, be called two-stage keep discharge).

(2), realize that the above-mentioned two-stage keeps discharge according to keeping the voltage waveform characteristic.

Here, the external voltage that requires be added to keep on the electrode during be called pulse and apply during, during being called the gap during the keeping in addition.Therefore, the discharge space voltage under the above-mentioned preposition discharge mainly is (discharge in the past forms down) wall voltage, realizes the high-luminous-efficiency discharge under the low discharge space voltage.And then in the main discharge of the preposition discharge that continues, wall voltage constantly descends with preposition discharge, compares with conventional example, realizes the main discharge of the high-luminous-efficiency under the low discharge space greatly.Why can under the low discharge space voltage main discharge take place, be because the space charge that preposition discharge takes place has down been brought into play ignition action.

In the present application,, applying suitable external voltage between electrode giving to keep during the gap because preposition discharge under the above-mentioned low discharge space voltage takes place.Suitable external voltage is exactly to realize stable above-mentioned two-stage discharge, and realizes the voltage of high-luminous-efficiency (realizing the low discharge space voltage).

And then, in the present application,, also comprise the mode that electrode connects inductance of keeping of utilizing in order to realize the suitable external voltage during the above-mentioned gap.In addition, be convenient to following explanation, it is as follows to define trailing edge and the rising edge of keeping pulse voltage.That is, be called trailing edge keeping the pulse voltage variation when beginning during the gap, be called rising edge keeping the pulse voltage variation when finishing during the gap.Among the application, representational content summary among only explanation discloses and invents is exactly as described below.

The to the effect that following plasma display system of the present application.

(1) a kind of plasma display system is characterized in that

Possess having a plurality of discharge cells of keeping electrode pair at least as the plasma display panel of inscape at least,

Comprise during the address at least and be used for the keeping of luminous demonstration during driving;

During above-mentioned the keeping, give the above-mentioned at least one side who keeps electrode pair of above-mentioned a plurality of discharge cells, apply the plasma display system of keeping pulse voltage,

During above-mentioned keeping, the main discharge that has preposition at least discharge and continue and take place with it;

Above-mentionedly keep pulse and have the voltage level that is used for above-mentioned preposition discharge at least and the voltage level that is used for above-mentioned main discharge.

(2) a kind of plasma display system is characterized in that

Possess having a plurality of discharge cells of keeping electrode pair at least as the plasma display panel of inscape at least,

Comprise during the address at least and be used for the keeping of luminous demonstration during driving;

During above-mentioned the keeping, give the above-mentioned at least one side who keeps electrode pair of above-mentioned a plurality of discharge cells, apply the plasma display system of keeping pulse voltage,

During above-mentioned keeping, have pulse apply during and the gap during;

During pulse before during being about to above-mentioned gap applies, give and above-mentionedly to keep the electrode voltage that electrode pair relatively applies positive voltage and be made as Vsp, the voltage of the opposing party's electrode is made as Vsn,

During above-mentioned gap, Vsp-Vsn has tangible negative value; And

Has Discharge illuminating during the above-mentioned gap.

(3) according to the plasma display system of preceding paragraph (1) or the arbitrary record of preceding paragraph (2), it is characterized in that comprising pulse apply during and during the gap keep the pulse semiperiod during in poor (being called the Vsp-Vsn amplitude) of maximal value and minimum value of above-mentioned Vsp-Vsn be more than the above-mentioned discharge ionization voltage of keeping between electrode pair.

(4), it is characterized in that the luminous intensity of the preposition discharge of luminous strength ratio of above-mentioned at least main discharge wants big according to the plasma display system of preceding paragraph (1) or the arbitrary record of preceding paragraph (2).

(5) according to the plasma display system of preceding paragraph (1) record, it is characterized in that the voltage level that is used for above-mentioned preposition discharge generates by setting up above-mentioned inductance element.

(6) according to the plasma display system of preceding paragraph (2) record, it is characterized in that above-mentioned preposition interdischarge interval, the means that are used to make Vsp-Vsn reach obvious negative value are to have inductance element.

When (7) pulse was risen, the mode by inductance element was not useful.

That is,, it is characterized in that above-mentionedly when keeping pulse and rising, become the formation that electric current does not flow to above-mentioned inductance element according to the plasma display system of preceding paragraph (5) or preceding paragraph (6) record.

(8) plasma display system of putting down in writing according to preceding paragraph (2), it is characterized in that during above-mentioned gap, keeping electrode 1 different keeping on the electrode 2 with having the side that the pulse voltage kept descends, apply apply with pulse during the above-mentioned voltage of keeping electrode 1 same-sign before.

(9) according to the plasma display system of preceding paragraph (1) or preceding paragraph (2) record, it is characterized in that during above-mentioned keeping in, being added to the above-mentioned above-mentioned pulse voltage of keeping of keeping electrode pair is to have the pulse of 0V level and Vs level at least, phase differential is the semiperiod mutually.

(10) according to the plasma display system of preceding paragraph (1) or the arbitrary record of preceding paragraph (2), in it is characterized in that during above-mentioned the keeping, be added to above-mentioned keep electrode pair above-mentioned keep pulse voltage be have at least-the Vs level and+pulse of Vs level, phase differential is the semiperiod mutually.

Description of drawings

Fig. 1 represents that the application illustrates voltage waveform and the Xe828nm luminescent waveform figure of the PDP of embodiment 1 plasma display system.

Fig. 2 is the PDP basic comprising figure of the embodiment of the invention 1 plasma display system.

Fig. 3 represents the work wave of keeping pulse generating circuit of the embodiment of the invention 1 plasma display system.

Fig. 4 represents the work wave of keeping pulse generating circuit of the embodiment of the invention 1 plasma display system.

Fig. 5 is the above-mentioned equivalent electrical circuit of keeping pulse generating circuit.

Fig. 6 represents the simple formation block diagram of plasma display system one example of the embodiment of the present application 4.

Fig. 7 is the driving voltage waveform of existing driving method.

Fig. 8 is each the dielectric surface potential illustraton of model at the moment of Fig. 7 a, b, c.

Fig. 9 is the driving voltage waveform of present embodiment 1.

Figure 10 is each the dielectric surface potential illustraton of model at Fig. 9 moment a, b1, b2, c.

Figure 11 is that another of the embodiment of the invention 1 kept the pulse waveform example.

Figure 12 be the embodiment of the invention 2 plasma display systems PDP keep pulse generating circuit.

Figure 13 be embodiment 2 keep the pulse generating circuit work wave.

Figure 14 be the embodiment of the invention 3 plasma display systems PDP keep pulse generating circuit.

Figure 15 be embodiment 3 keep the pulse generating circuit work wave.

Figure 16 is that another of the embodiment of the invention 3 kept the pulse voltage waveform.

Figure 17 be the embodiment of the invention 4 plasma display systems PDP keep the pulse voltage waveform.

Figure 18 is that another of present embodiment kept the pulse voltage waveform.

Figure 19 is that another of present embodiment kept the pulse voltage waveform.

Figure 20 be the embodiment of the invention 5 plasma display systems PDP keep the pulse voltage waveform.

Figure 21 represents according to a of three electrode structures of learning, the stereographic map of b surface discharge type PDP one example.

Figure 22 is the plasma display panel sectional view that arrow D1 direction is seen from Figure 21.

Figure 23 is the plasma display panel sectional view that arrow D2 direction is seen from Figure 21.

Figure 24 represents the basic comprising block diagram of existing plasma display system.

Figure 25 is used to illustrate the drive circuit works figure that shows the TV field interval that a width of cloth is drawn on the plasma display panel.

Figure 26 represents the voltage waveform of PDP of existing plasma display system and the graph of a relation of Xe828nm luminescent waveform.

Figure 27 is the dielectric surface potential mode chart of embodiment 4.

Another of the PDP of Figure 28 embodiment of the invention 5 plasma display systems kept the pulse voltage waveform.

Embodiment

Below, embodiments of the present invention will be described in detail with reference to the accompanying drawings.Also have, be used to illustrate whole accompanying drawings of embodiment, every member with agreement function is all given the agreement symbol, partly omits repeat specification.

[embodiment 1]

Fig. 1 is the voltage waveform (Fig. 1 (a)) and Xe828nm luminous (be excite Xe atomic emissions 828nm wavelength luminous, below adopt this abbreviation) waveform (Fig. 1 (b)) figure of the PDP of the expression embodiment of the invention 1 plasma display system.The time shaft of each accompanying drawing transverse axis of Fig. 1 (a) and (b) is represented synchronously.Fig. 2 is the PDP basic comprising figure of embodiment of the invention plasma display system.Fig. 3 represents an illustration of keeping pulse generating circuit of the embodiment of the invention 1 plasma display system.Fig. 4 is this work wave.And Fig. 5 is the above-mentioned equivalent electrical circuit of keeping pulse generating circuit.And then Figure 26 represents the graph of a relation of voltage waveform (Figure 26 (a)) and Xe828nm luminescent waveform (Figure 26 (b)) of the PDP of existing plasma display system.As with the comparison of this example, with reference to Figure 26.

At first, the basic comprising of this routine plasma display system is as follows.Promptly, as shown in Figure 2, present embodiment 1 has: the panel 201 with the same discharge cell of constructing of conventional example Figure 21 is arranged, constitute X electrode terminal section 202, Y electrode terminal section 203 and the A electrode terminal section 204 of interior electrode group of panel and external circuit connecting portion, drive their X driving circuit 205, Y driving circuit 206 and A driving circuit 207, reach eikongen 103 to the picture intelligence of these driving circuit 205,206,207 display frames, and, the power circuit 208 that provides electric power for each driving circuit 205,206,207 and the eikongen 103 of these grades.X driving circuit 205 has X driving circuit 209 during the reseting address, keep during X driving circuit 210, suitably regularly to the X switch driving circuit 212 of its switch of changing 211, gauge tap.And Y driving circuit 206 has Y driving circuit 213 during the reseting address, keep during Y driving circuit 214, lively regularly to the Y switch driving circuit 216 of its switch of changing 215, gauge tap.

Utilize Figure 25, Fig. 1 and Fig. 2, the driving method of present embodiment plasma display system is described.Driving method basis during the TV field (field) of PDP is same with method shown in Figure 2.That is, each son comprises, shown in Figure 25 (a) (II), discharge cell get back to original state reseting period 49, select during the address of luminous discharge cell 50, show during the keeping of luminous selected discharge cell 51.

Interdischarge interval comprises at least during the address and because present luminescence emissions to be kept during the keeping of discharge.During the address, at first, according to the signal of the eikongen 103 of Fig. 2, by X, Y switch driving circuit 212,216, make switch 211,212 respectively with reseting address during during the X driving circuit 209, reseting address Y driving circuit 213 link.Secondly, signal according to eikongen 103, by X, Y driving circuit 209,216 during A driving circuit 101 and the above-mentioned reseting address, make should be luminous the discharge cell that requires the address discharge takes place, and between the X of the discharge cell of above-mentioned requirements, Y electrode wall voltage Vw (V) takes place.Therefore, select to keep during not as the discharge cell of luminous discharge cell.During keeping, at 35 at X electrode 34 and Y electrode, only when having this wall voltage because the voltage that reaches degree of discharge is added between X electrode and Y electrode, the discharge cell that has only requirement is Discharge illuminating.

During keeping 51, switch 211,215 and keep during X, Y driving circuit 210 sides link.Among Fig. 1 (a), 51 were added to simultaneously and keep pulse voltage waveform and the address voltage waveform that is added to constant voltage V4 on the A electrode 29 on X electrode and the Y electrode during expression was kept.Here, Vx, Vy are the pulse voltages of keeping that is added on X, the Y electrode, and Vx-Vy is its voltage difference, i.e. the interelectrode voltage of X-Y.Among Fig. 1 (b), represent this Xe828nm luminescent waveform during keeping.Before main discharge, becoming has the multimodal of preposition discharge 412 luminescent waveform.

The plasma display system of the embodiment of the invention 1 and the difference of existing apparatus are as follows.

From prior art, shown in Figure 25 (c), during keeping, give the pulse voltage of keeping of rectangular voltage waveform 58,59 that X, Y electrode 34,35 apply crest voltage V3.Perhaps, consider the rising edge and the trailing edge of pulse, just apply the pulse voltage of keeping shown in Figure 26 (a).At this moment, add the maximal value of the Vx-Vy absolute value of impulse duration, or with the gap during among the above-mentioned impulse duration distinct symbols that adds, or with the maximal value sum of Vx-Vy absolute value during effective 0V be to keep about the peak value V3 of pulse voltage.Performance aspect in addition comprises that the maximal value of keeping the Vx-Vy during the pulse semiperiod that adds during impulse duration and the gap and poor (being called the Vx-Vy amplitude) of minimum value are for about the peak value of keeping pulse voltage.At this moment, become this unimodal luminescent waveform (for example Xe828nm luminescent waveform) of Figure 26 (b) expression usually.

To this, in the embodiments of the invention 1, during keeping in, give on X, the Y electrode 34,35 and apply the pulse voltage of keeping shown in Fig. 1 (a).At this moment, unlike the prior art, add the maximal value of the Vx-Vy absolute value of impulse duration, or with the gap during among the above-mentioned impulse duration distinct symbols that adds, or with the maximal value sum of Vx-Vy absolute value during effective 0V be V3+V5, become significantly more than the peak value V3 that keeps pulse voltage.Performance aspect in addition, poor (being called the Vx-Vy amplitude) that comprises the maximal value of keeping the Vx-Vy during the pulse semiperiod that adds during impulse duration and the gap and minimum value for the peak value V3 that keeps pulse voltage some.At this moment, as above-mentioned, before main discharge 411, just become multimodal luminescent waveform (for example xe828nm luminescent waveform) with preposition discharge 412 as Fig. 1 (b) expression.Here, set above-mentioned V5 and be the preposition discharge 412 of generation, and the voltage of main discharge takes place.

At first, condition as preposition discharge generation, the maximal value that adds the Vx-Vy absolute value of impulse duration, or with the gap during in the above-mentioned impulse duration distinct symbols that adds, or with the maximal value sum of Vx-Vy absolute value during effective 0V be V3+V5, and this V3+V5 is exactly more than the discharge ionization voltage of keeping between electrode pair.Spring item aspect is in addition comprising that the Vx-Vy amplitude of keeping during the pulse semiperiod during adding impulse duration and gap is exactly more than the discharge ionization voltage of keeping between electrode pair.

Secondly, for preposition discharge 412 takes place, and main discharge taking place, needs luminous intensity one side of main discharge 411 bigger than the luminous intensity of preposition discharge 412.

Then, represent to keep the physical circuit of pulse generating circuit for example.Fig. 3 is the pulse generating circuit of keeping of embodiment 1.This circuit is the physical circuit of keeping drive X, Y electrode about basic comprising figure shown in Figure 2.That is, Fig. 3 by the panel 201 of Fig. 2, keep during the basic comprising physical circuit example formed of X, Y driving circuit 210,214, eikongen 103, power circuit 208.The interelectrode capacitor C p of X-Y that panel 201 usefulness are kept electrode represents.The X driving circuit constitutes by having the P transistor npn npn Px2, N transistor npn npn Nx1, the Nx3 of ground connection, inductance L, diode Dx1, Dx2, the Dx3 that connect voltage source V s.The Y driving circuit constitutes by having the P transistor npn npn Px2, N transistor npn npn Nx1, the Nx3 of ground connection, inductance L, diode Dx1, Dx2, the Dx3 that connect voltage source V s too.

Fig. 4 is the working waveform figure of keeping pulse generating circuit of embodiment 1.Vx is the voltage waveform of X electrode, and Vy is the voltage waveform of Y electrode, and Vx-Vy is X-Y inter-electrode voltage waveform (a voltage difference waveform).Sx1～Sx3, Sy1～Sy3 are the control signal waveforms.Voltage waveform on each terminal of each symbolic representation Fig. 3.According to Fig. 4, the work of key diagram 3.

At moment t1, Sx2 is the L level, and transistor Px2 conducting is linked voltage source V s by diode Dx2, thereby Vx is the time constant that resistance by Cp and wiring etc. decides, and becomes the setting voltage V3 of voltage source V s.At this moment Sy3 becomes the H level, transistor Ny3 conducting and ground connection, thereby Vy is an earth potential.At moment t2, transistor Nx1 conducting is by inductance L ground connection.At this moment, Sy3 also becomes the H level, makes transistor Ny3 conducting ground connection.So, suppose that R is the resistance of wiring etc., just forms the LCR series circuit of Fig. 5.At this moment, the voltage Vx (t) of X electrode is represented by following damped oscillation formula.

[formula 1] $\mathrm{Vx}\left(t\right)={\mathrm{<figure-callout\; id="0"\; label="V"\; filenames="A0212776200231.png,A0212776200321.png"\; state="\{\{state\}\}">V</figure-callout>}}_{0\&times;e^{-t/(2L/R)}}\&times;\frac{\sin (\sqrt{1/\mathrm{LCp}-{(R/2L)}^{2}t}+\mathrm{\&theta;})}{\sin \mathrm{\&theta;}}$

[formula 2] $\mathrm{\&theta;}={\tan }^{-1}\left[(2L/R)\sqrt{1/\mathrm{LCp}-{(R/2L)}^2}\right]$

Therefore, this amplitude and cycle are regulated by L, can obtain Fig. 1 (a) such keep voltage waveform.In the work of moment t3, t4, just equal X+Y to be put upside down, thereby omit explanation according to the action of moment t1, t2.

And, the voltage of X shown in Fig. 6, Y, A electrode, the current waveform coefficient of determination.Voltage waveform is to use oscillograph, measures portion's line exposed portions serve of 205,206,207 of each driving circuits from X electrode terminal section 202, Y electrode terminal section 203, A electrode terminal section 204.In addition, current waveform is from each electrode, and current probe is connected in the wiring between driving circuit, measures with oscillograph.The mensuration direction of each electric current just is set at during from panel 201 outer flow such as each electrode.

Selection is in during the address under the state B (the black demonstration or black pattern) of the discharge cell group of identical selection afore mentioned rules with state W beyond the state W (showing in vain or white pattern) of 50 regulation discharge cell group and the afore mentioned rules discharge cell group, and the voltage waveform that electrode pair 1,2 and A electrode are kept in setting is respectively Vs1W (t), Vs2W (t), VsaW (t) and Vs1B (t), Vs2B (t), VsaB (t).Set each current waveform and be respectively js1W (t), js2W (t) and js1B (t), js2B (t), jsaB (t).Here, keep electrode 1 and be during the gap after soon, keep the electrode (current Y electrode) that relatively becomes positive potential on the electrode pair, the opposing party's X electrode is to keep electrode 2.

At first, compare the driving method of the present application and discharge power, briliancy, the efficient of existing driving method.Discharge power W is the following integration by 1 cycle

[formula 3] W=∮ (js1W (t) Vs1W (t)+js2W (t) Vs2W (t)+jsaW (t) VsaW (t) dt

Calculate.

Briliancy is measured with brightness photometer, calculates luminescence efficiency η ∝ B/W from W and B.

In the existing driving method, the address electrode voltage V4=90V during using and keep voltage V3=180V, keeping drives.

On the other hand, in the driving method of the present invention, the address electrode voltage V4=90V with V3=180V, V5=60V, during keeping drives.At this moment, the ratio of each Discharge illuminating characteristic value (driving the value of the value/existing driving method of method with the present invention) is as follows.That is, the discharge power ratio is 0.86, and luminance ratio is 1.12, and efficiency ratio is 1.30.Like this, compare, can confirm that the present application improves about 3 one-tenth of luminescence efficiency with existing method.

Secondly, utilization to the dielectric surface potential model shown in Figure 10, illustrates discharge of the present application and the mechanism that luminescence efficiency improves at Fig. 7.It is such that the ultimate principle of raising the efficiency, front had been said, aspect weak electric field (low discharge space voltage) discharge, is because temperature reduces, and ultraviolet luminous efficiency is increased.

Fig. 7 is that (A), (B), (C) of the driving voltage waveform of existing driving method and Fig. 8 is each the dielectric surface potential illustraton of model at the moment of Fig. 7 a, b, c.Regulation is kept the voltage Vs=Vsx=Vsy=180V of electrode X, Y, A electrode voltage Va=90V.At moment a, suppose that the discharge that caused by the pulse of X electrode voltage finishes, become in the discharge space and discharge before not having electric field.At this moment, the dielectric surface potential of X, Y, A electrode all is 90V.At this moment, between X, Y, A electrode and dielectric surface, the wall voltage shown in the accompanying drawing takes place.During the gap of moment b, the X electrode voltage becomes 0V, thereby the dielectric surface potential of X electrode is wall voltage part-90V.At moment c, the Y electrode voltage becomes 180V, thereby the current potential of 270V takes place on the dielectric surface of Y electrode.At this moment, the potential difference (PD) between X, Y electrode dielectric surface has become 360V, thereby becomes more than the discharge ionization voltage (about 230V), and the generating plane discharge.And the potential difference (PD) between the dielectric surface of A electrode is 180V, finishes not discharge below the discharge ionization voltage (about 210V).In addition, among Fig. 8, symbol 33 is discharge spaces, the 401st, keep the Y electrode, and the 402nd, keep the X electrode, the 403, the 404th, dielectric layer.

On the other hand, Fig. 9 is the driving voltage waveform figure of present embodiment 1, and Figure 10 is each the surface dielectric bulk potential illustraton of model at the moment of Fig. 9 a, b1, b2, c.

At moment a, same with above-mentioned existing driving method, the dielectric surface potential of X, Y, A electrode all is 90V (Figure 10 (A)).At this moment, the wall voltage shown in the figure takes place between X, Y, A electrode and dielectric surface electrode.Moment b1 during the gap, the X electrode voltage becomes 0V, thereby the dielectric surface potential of X electrode is wall voltage part-90V (Figure 10 (B1)).Moment b2 during the gap, the X electrode voltage becomes-V5=-60V, thereby the dielectric surface potential of X electrode becomes-150V (Figure 10 (B2)).At this moment, potential difference (PD) becomes the above 240V of discharge ionization voltage (about 230V) between the dielectric surface of X, Y electrode, potential difference (PD) becomes the above 240V of discharge ionization voltage (about 210V) between the dielectric surface of X, A electrode, thereby becomes between the X-Y-A electrode three preposition discharge (P) all takes place.Then, along with X, Y, the wall voltage decline on A electrode dielectric surface and the change in voltage of X electrode that this preposition discharge causes, discharge once weakened.At moment c, the result of preposition discharge, each electrode wall voltage is reducing, shown in Figure 10 (C).In addition, Figure 10 is representing with the agreement symbol with the same position of Fig. 8.

On the other hand, the voltage of adding 180V for the Y electrode, thereby the dielectric surface potential of Y electrode becomes 255V.Also have, the dielectric surface potential of X electrode is-50V.Its result, the potential difference (PD) between the dielectric surface of X, Y electrode is exactly 305V, and is more than the discharge ionization voltage (about 230V).So, main discharge (face discharge) takes place between the dielectric surface of X-Y electrode (M).In this time, the wall voltage of A electrode has become-25V, thereby A electrode dielectric surface potential is 65V, and can not discharge between the big machine of X.In addition, at this moment in fact because of the ignition action of preposition discharge P, the voltage of Y electrode becomes maximum moment c and just began main discharge in the past, thereby should more discharge under the low discharge space voltage.Two kinds of discharges of preposition discharge P, main discharge M more all take place under the low discharge space voltage with the situation of existing driving method.So, discharge one side under low discharge space voltage more, ultraviolet luminous efficiency is higher, thereby improves the luminescence efficiency of this PDP.

As above, keep the face discharge between electrode pair in case weaken because of preposition discharge, and then, utilize the ignition action of preposition discharge that main discharge is taken place.Each discharge more all takes place under the low discharge space voltage with existing driving method, therefore improves ultraviolet luminous efficiency.

In addition, incident ionic energy and existing driving method to the dielectric surface of X, Y electrode relatively reduce, thereby diaphragm, and promptly the life-span of MgO prolongs.

In addition, in preposition discharge, the A electrode is also relevant with discharge, but incident electron rather than the ion on the fluorophor bombard on the A electrode, and phosphor lifetime is not almost had bad influence.

As above, according to driving method of the present invention, compare with existing method, can improve luminescence efficiency, and it is few to drive the life characteristic deterioration.

And then it also is advantage that the driving method that available and existing method differs widely drives.

Moreover preposition discharge is strong excessively, and main discharge can't take place, thereby should control to the suitable intensity that does not hinder the main discharge degree to preposition discharge.Figure 11 is that another of impurity concentration embodiment of this situation kept the pulse waveform example.During this gap, roughly comprise the damped oscillation waveform of one-period, be to adopt the circuit identical with Fig. 3, obtain as L by selecting the value littler than Fig. 1 occasion.At the moment of Figure 11 b2, with the preposition discharge of the same generation of the moment b2 of Fig. 9.But after preposition discharge began, Vx rose to positive V6 at once, thereby was suppressed before preposition discharge becomes by force.Therefore, do not hinder the continuation main discharge also can continue to keep discharge.Employing is adjusted to the way of this waveform, just can become the wide best preposition discharge of working range.In addition, during the gap, use roughly to comprise the waveform of one-period damped oscillation, but according to circumstances, select suitable cycle and intensity good here.

[embodiment 2]

Figure 12 is the example of keeping pulse generating circuit of the PDP of the embodiment of the invention 2 plasma display systems.The X driving circuit has the P transistor npn npn Px2 that receives voltage source V s, N transistor npn npn Nx1, inductance L and diode Dx1, the Dx2 of ground connection.The Y driving circuit has the P transistor npn npn Py2 that receives voltage source V s, N transistor npn npn Ny1, inductance L and diode Dy1, the Dy2 of ground connection too.

Figure 13 is the work wave of keeping pulse generating circuit of embodiment 2.Sx1, Sx2, Sy1, Sy2 are the control signal waveforms.According to Figure 13, the circuit working of Figure 12 is described.

At moment t1, Sx2 is the L level, and transistor Px2 conducting is received voltage source V s by diode Dx2.At this moment, Sy1 becomes the H level, and transistor Ny1 conducting is by inductance L ground connection.So, if R is for the resistance of wiring etc. and form the LCR series circuit of Fig. 5, generation damped oscillation aspect Vx-Vy.At moment t2, Sx1 is the H level, and transistor Nx1 conducting is by inductance L ground connection.At this moment, Sy1 also is the H level, and transistor Ny1 conducting is by inductance L ground connection.So, if R for the wiring etc. resistance and form the LCR series circuit, Vx, Vy, Vx-Vy are exactly generation damped oscillation as shown in figure 13.In the work of moment t3, t4, equal in the work of constantly t1, t2 X+Y to be turned around, thereby omit explanation.

This occasion is also identical with embodiment 1 during the gap, and Vx-Vy is a transient characteristic upper punch waveform, thereby by suitably selecting inductance value, preposition discharge, main discharge can take place, and improves the luminescence efficiency of PDP.

As above, in the present embodiment, just insert inductance L on the prior art, be easy to low-cost production's circuit, and can improve the efficient of PDP.

[embodiment 3]

Figure 14 is the example of keeping pulse generating circuit of the PDP of the embodiment of the invention 3 plasma display systems.Present embodiment is the example without inductance below 3.X driving circuit formation has the N transistor npn npn Nx1 that receives voltage source V so, N transistor npn npn Nx3 and the diode Dx1～Dx3 that connects voltage source P transistor npn npn Px2, ground connection.The Y driving circuit constitutes and to have the N transistor npn npn Ny1 that receives voltage source V so, N transistor npn npn Ny3 and the diode Dy1～Dy3 that connects voltage source P transistor npn npn Py2, ground connection too.

Figure 15 is the work wave of keeping pulse generating circuit of embodiment 3.Sx1～Sx3, Sy1～Sy3 are the control signal waveforms.The work of Figure 14 is described according to Figure 15.

At moment t1, N transistor npn npn Ny1 conducting is received voltage source V so by diode Dy1, and Vy is maintained voltage-V5.At this moment, N transistor npn npn Nx3 conducting and ground connection.At moment t2, transistor Ny1 becomes not conducting, transistor Ny3 conducting and ground connection, thereby Vy is 0V.At moment t3, transistor Nx2 and Ny3 conducting, Vx is V3, Vy becomes ground connection.Below same, look at that Figure 15 is just clear, thereby omit explanation.

Figure 16 is that another of the embodiment of the invention 3 kept the pulse voltage waveform.This is the waveform for Vx-Vy, manage to make it+-voltage of V5 level directly moves on to+-voltage of Vs level.

In this case, also similarly to Example 1, Vx-Vy has become the upper punch waveform of transient characteristic, thereby preposition discharge, main discharge can take place during the gap, improves the luminescence efficiency of PDP.In the present embodiment, can be than using free controlled the formation better of inductance L to keep pulse waveform.

[embodiment 4]

Figure 17 is the example of keeping the pulse voltage waveform of the PDP of the embodiment of the invention 4 plasma display systems.Different with the waveform of Figure 15 of embodiment 3, be exactly on X, the Y electrode added V5 voltage be positive voltage.The Vx-Vy waveform frame is identical with Figure 15.

Utilize the dielectric surface potential illustraton of model of Figure 27, the raising mechanism of discharge and luminescence efficiency is described.Figure 27 and Figure 10 are same, the respectively moment a, the b1 of expression Figure 17, the dielectric surface potential state under b2, the c.Similarly to Example 1, suppose that V3=180V, V5=60V, A electrode voltage are constant 90V.Up to moment a, b1 all with Figure 10 identical ((A) of Figure 27, (B1)) of embodiment 1.Moment b2 during the gap, the Y electrode voltage becomes V5=60V, thereby the dielectric surface potential of Y electrode becomes 150V.At this moment, the dielectric surface electrical potential difference of X, Y electrode becomes the above 240V of discharge ionization voltage (about 230V), thereby becomes the preposition discharge (P) (Figure 27 (B2)) of face discharge between the X-Y electrode.Different with the example of Figure 10, the dielectric surface electrical potential difference of X, A electrode is the following 180V of discharge ionization voltage (about 210V), thereby the subtend discharge can not take place between the X-A electrode.Then, along with the wall voltage decline on Y, A electrode dielectric surface and the change in voltage of X electrode, discharge was once weakened.At moment c, the result of preposition discharge reduces each electrode wall voltage as Figure 27 (C).

On the other hand, the voltage of applying 180V for the Y electrode, thereby the dielectric surface potential of Y electrode becomes 230V.In addition, the dielectric surface potential of X electrode is-50V.Its result, potential difference (PD) becomes 280V between the dielectric surface of X, Y electrode, is exactly more than the discharge ionization voltage (about 230V).So, main discharge (face discharge) takes place between the dielectric surface of X-Y electrode (M).The two kinds of discharges of preposition discharge P, main discharge M and the occasion of existing driving method relatively all take place under the low discharge space voltage.So the ultraviolet luminous efficiency of discharge one side under national low discharge space voltage is higher, thereby the luminescence efficiency of this PDP improves.

In addition, Figure 18, Figure 19 all be present embodiment another keep the example of pulse voltage waveform.The situation of these waveforms also has the raising luminescence efficiency effect same with Figure 17 waveform situation.

In the present embodiment 4, do not comprise substantially in the preposition discharge and keep electrode and the interelectrode subtend discharge of A, thereby phosphor lifetime is not had baneful influence.

[embodiment 5]

Figure 20 be in the plasma display system of the embodiment of the invention 5 PDP keep the pulse voltage waveform.Vx and Vy are symmetry up and down, but the waveform of Vx-Vy then the Figure 17 with embodiment 4 is identical.At this moment also has same raising luminescence efficiency effect.

Figure 28 is the variation of keeping the pulse voltage waveform of the interior PDP of plasma display system of the embodiment of the invention 5.At this moment also has same raising luminescence efficiency effect.In addition, also has the advantage that V5 power supply necessary among Figure 20 no longer needs.

And self-evident, the various combinations and all possible variation of the various embodiments described above can be implemented as the present application.

More than, be illustrated particularly according to above-mentioned each embodiment, yet the present application being not limited to the content of the foregoing description, it is certain that various changes can also be arranged in the scope that does not break away from its main idea.

The present application provides a kind of driving method that improves the plasma display panel luminescence efficiency.And then, in the other form of the present application, can provide the plasma display system of higher luminous efficiency.

Claims (10)

1. a plasma display system is characterized in that

Have plasma display panel, this plasma display board possesses at least and has a plurality of discharge cells of keeping electrode pair and address electrode at least;

Comprise during the address at least and be used for the keeping of luminous demonstration during driving;

During above-mentioned the keeping, give the above-mentioned at least one side who keeps electrode pair of above-mentioned a plurality of discharge cells, apply and keep pulse voltage, and

During above-mentioned keeping, the main discharge that has preposition at least discharge and continue and take place with it;

Make above-mentioned keeping in the pulse, have voltage level that is used for above-mentioned preposition discharge at least and the voltage level that is used for above-mentioned main discharge.

2. a plasma display system is characterized in that

Have and possess plasma display panel at least with a plurality of discharge cells of keeping electrode pair and address electrode at least;

Comprise during the address at least and be used for the keeping of luminous demonstration during driving;

During above-mentioned the keeping, give the above-mentioned at least one side who keeps electrode pair of above-mentioned a plurality of discharge cells, apply and keep pulse voltage, and

During above-mentioned keeping, have pulse apply during and the gap during;

During pulse before during being about to above-mentioned gap applies, apply relatively that the electrode voltage of positive voltage is made as Vsp for the above-mentioned electrode pair of keeping, the opposing party's electrode voltage is made as Vsn,

During above-mentioned gap, Vsp-Vsn has effective negative value; And

Can during above-mentioned gap, have Discharge illuminating.

3. according to claim 1 or 2 arbitrary described plasma display systems, it is characterized in that being set in have above-mentioned pulse apply during and during the above-mentioned gap keep the pulse semiperiod during the maximal value of above-mentioned Vsp-Vsn and poor (being called the Vsp-Vsn amplitude) of minimum value for more than the above-mentioned discharge ionization voltage of keeping between electrode pair.

4. according to claim 1 or 2 arbitrary described plasma display systems, it is characterized in that luminous intensity one side of the preposition discharge of luminous strength ratio of above-mentioned at least main discharge wants big.

5. plasma display system according to claim 1 is characterized in that the voltage level that is used for above-mentioned preposition discharge generates by setting up above-mentioned inductance element.

6. plasma display system according to claim 2 is characterized in that at above-mentioned preposition interdischarge interval the device that is used to make Vsp-Vsn reach obvious negative value is the device with inductance element.

7. according to claim 5 or 6 each described plasma display systems, it is characterized in that in having the pulse generating circuit of inductance element, when keeping pulse and rising, become the structure that electric current does not flow to above-mentioned inductance element above-mentioned.

8. plasma display system according to claim 2, it is characterized in that to be set in during the above-mentioned gap, with have that the pulse voltage kept descends the 1st keep different the 2nd the keeping on the electrode of electrode, the above-mentioned the 1st before applying during applying with pulse just kept the voltage of electrode same-sign.

9. according to claim 1 or 2 each described plasma display systems, it is characterized in that can be during above-mentioned keeping in, being added to the above-mentioned above-mentioned pulse voltage of keeping of keeping electrode pair is to have the pulse of 0V level and Vs level at least, and phase differential is the semiperiod mutually.

10. according to claim 1 or 2 each described plasma display systems, it is characterized in that can be during above-mentioned keeping in, be added to above-mentioned keep electrode pair above-mentioned keep pulse voltage be have at least-the Vs level and+pulse of Vs level, phase differential is the semiperiod mutually.

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