CN1280353A

CN1280353A - Method for driving plasma display panel

Info

Publication number: CN1280353A
Application number: CN 00124235
Authority: CN
Inventors: 郑东哲
Original assignee: Samsung SDI Co Ltd
Current assignee: Samsung SDI Co Ltd
Priority date: 1999-07-13
Filing date: 2000-07-13
Publication date: 2001-01-17

Abstract

Provided is a method for driving plasma display panel (PDP), wherein the voltage is maintained through applying a sine wave not a square wave to discharge. The display panel has improved discharge continuity. The maintaining voltage is executed continuously through applying a sine wave voltage in the maintained discharge cycle of the display discharge. Thereby, the excellent luminance and driving efficiency are obtained.

Description

Drive the method for plasma display

The present invention relates to a kind of method that is used to drive plasma display (PDP), by applying a sine wave but not voltage is kept in the discharge of square wave, this plasma display panel has the discharge continuity of an improvement.

Fig. 1 illustrates a kind of basic structure of common alternating current flow pattern plane discharge plasma display, wherein forwardly forms a discharge space 15 between substrate of glass 11 and the rear part glass substrate 17.In this AC type plane discharge PDP, be coated with a dielectric layer 13 on the scan electrode 12 so that itself and discharge space 15 electricity are isolated.In this case, keep discharge by known wall charge effect.In above-mentioned plane discharge PDP, address electrode 16 forms in rear portion substrate 17 and makes and the scan electrode of being made up of two electrodes quadrature mutually that these two electrodes are an X electrode 12a and Y electrode 12b parallel to each other of formation in front glass substrate 11.According to this structure, one is used to select the address discharge of a pixel to produce between address electrode 16 and scan electrode 12, and subsequently, the discharge of keeping that is used for display video signal produces between X electrode 12a and Y electrode 12b.

Fig. 2 is a decomposition diagram that schematically shows a kind of plasma display panel of AC type three electrode plane discharge, and one of them address electrode 16 and a pair of

perpendicular scan electrode

12a, 12b are installed in the discharge space 15 that is separated by the baffle plate 18 that forms in the rear portion substrate 17.Baffle plate 18 is used to stop space charge and is created in discharge process medium ultraviolet ray, therefore avoids crosstalk (the cross talk) that produce in neighboring pixels except that forming discharge space 15.For PDP being used as a kind of chromatic display operation, by produce at interdischarge interval ultraviolet ray excited, that have red (R), green (G), blue (B) visible light ray emission characteristic, be used to show fluorescence coating 19 R, G and B color, that make by fluorescent material, repeatedly be coated in the discharge space 15 in order, thereby show R, G, B color.

For obtaining can be as the PDP with fluorescent material coating of colour video display unit spare, the essential gray shade scale that realizes shows.At present, a kind of grey scale display method is widely used, and it is divided into a plurality of sons field with a frame picture, drives with time division way then.Fig. 3 illustrates a kind of grey scale display method of a kind of common AC type PDP.As shown in Figure 3, in the grey scale display method of a kind of common AC type PDP, a frame picture is divided into four sons and 16 (=2 from the time ⁴) individual gray shade scale is shown, each son field comprises address cycle A1-A4 and keeps discharge cycle S1-S4.The principle that employing is kept the respective length of discharge cycle with brightness ratio from expression is visually carried out the demonstration of gray shade scale.In addition, because first son (SF1) is according to 1: 2: 4 to the length S1 to S4 that keeps discharge cycle of the 4th son (SF4): 8 ratio forms 16 classes altogether and keeps discharge cycle, promptly, 0,1 (1T), 2 (2T), 3 (1T+2T), 4 (4T), 5 (1T+4T), 6 (2T+4T), 7 (1T+2T+4T), 8 (8T), 9 (1T+8T), 10 (2T+8T), 11 (3T+8T), 12 (4T+8T), 13 (1T+4T+8T), 14 (2T+4T+8T) and 15 (1T+2T+4T+8T) therefore show 16 gray shade scale ranks.For example, for an arbitrary pixel point display gray scale 6, only need addressing is carried out in the 2nd son field (2T) and the 3rd son (4T), same, for display gray scale 15, from first to the 4th all son fields must be addressed.

Fig. 4 constitutes a kind of electrode arrangement that exchanges plane discharge PDP that realizes grey scale display method shown in Figure 3.With reference to Fig. 4, the X electrode (X1 to X9) of scan electrode 12a all links together, and applies the voltage signal with same waveform as to it, keeps discharge pulse comprising one.Therefore, scan electrode 12 sweep signal is applied to Y electrode (Y1 to Y9) 12b so that carry out addressing between Y electrode 12b and an addressing electrode 6.Keep discharge pulse and also be added between Y electrode 12b and the X electrode 12a, show discharge so that keep.

Fig. 5 is the waveform synoptic diagram that is applied to the drive signal on each electrode in the said structure.

In Fig. 5, mark A represents a drive signal that is applied on the address electrode, and mark X represents to be applied to the drive signal on X electrode (the being also referred to as common electrode) 12a, and mark Y1 to Y480 represents to be applied to each Y electrode 12b and goes up drive signal.For an accurate grayscale shows, remove among the cycle A11 fully at one, a complete reset pulse 22a is applied in common electrode (X) 12a, to produce a strong discharge, remove the wall electric charge that produced of once discharge by before with this, to carry out the work (step 1) of next height field.Then, remove cycle A13 fully a complete write cycle time A12 and one, in order to reduce address pulse voltage 21, a complete write pulse 23 is applied in Y electrode 12b, a complete reset pulse 22b is applied in X electrode 12a, write discharge and a removing discharge fully fully to produce one respectively, thereby control accumulates in the wall amount of charge (step 2 and 3) in the discharge space 15.Then, at an addressing period A14, utilization is at (21 and write pulses 24 of the address pulse of step 4) (data pulse) between location electrode 16 and the scan electrode 12b mutual vertically, by selectable discharge, the data that convert electric signal to are write on (step 4) on the selected position on the whole screen of PDP.

Keep among the discharge cycle S1 at one, be to realize the purpose of picture data on screen, applying continuously that discharge keeps that pulse 25 produced one shows that discharge is kept and reaches a given time cycle.In the continuous discharge cycle, as shown in Figure 5, apply square-wave voltage sh.The pulse width of total square-wave voltage that applies surpasses 2.5 μ s, and its frequency is higher than 100KHz.As long as apply a pulse, continuous discharge shown in Figure 1 just occurs once.Along with the increase of the discharge time that occurs, brightness also just increases.Therefore, gray level display can be kept the quantity of pulse and realizes by regulating the discharge applied.Yet, as shown in Figure 5, apply the keeping discharge and can repeat to take place an of intermittence as shown in Figure 1 with the form of square-wave pulse if pulse is kept in discharge.Because the color outline effect of false color, such one discontinuous keep discharge repeat to be shown as if to recur.

For addressing the above problem, the purpose of this invention is to provide a kind of method that is used to drive plasma display (PDP), wherein keeping discharge is to occur continuously.

Therefore, for achieving the above object, a kind of method that is used to drive low-power consumption plasma display (PDP) is proposed, this display panel has by many discharges that scan electrode and common electrode are formed keeps electrode, and address electrode is provided with to such an extent that to keep electrode perpendicular with discharge, this method is characterised in that, in order to show a frame picture, this frame is divided into a plurality of sons field, to show its grey level, each height field comprises an initial period, an address cycle and a continuous discharge cycle, and keep electrode in the continuous discharge cycle to discharge and apply a sine voltage.

In the present invention, put on scan electrode to public electrode on sine voltage preferably have 180 ° phase differential.And, the best ground connection of scan electrode, sine voltage only puts on the public electrode.

By the reference accompanying drawing preferred embodiment is described in more detail, above-mentioned purpose of the present invention and advantage are just more obvious.

Fig. 1 is the vertical cross section of plane discharge Plasmia indicating panel (PDP) basic structure of expression a kind of common alternating current (AC) type;

Fig. 2 is a decomposition diagram that schematically shows AC type three electrode plane discharge PDP as shown in Figure 1;

Fig. 3 represents the grey scale display method of AC type shown in Figure 2 three electrode plane discharge PDP.

Fig. 4 is the arrangenent diagram that constitutes the AC type plane discharge PDP shown in Figure 2 that realizes grey scale display method shown in Figure 3;

Fig. 5 is the oscillogram that is applied to the drive signal on each electrode shown in Figure 4

Fig. 6 is the synoptic diagram that PDP driving method according to the present invention applies a kind of method of a sinusoidal wave pulse.

Fig. 7 is the synoptic diagram that PDR driving method according to the present invention applies the another kind of method of a sinusoidal wave pulse.

With reference to accompanying drawing, a kind of method that is used for the low-power consumption plasma display according to the present invention is described in detail.

As mentioned above, a kind of matrix drive method is widely used in display frame on flat-panel display device.According to the method, keep electrode and keep in the orthogonal group address electrode of electrode one group of the horizontal direction setting consistent discharge with discharge with the direction of scanning, select any a pair of level and vertical electrode, a picture signal shows in its point of crossing.And, for display frame on a flat-panel display device, display device drives by two steps: on screen, select one arbitrarily pixel address step and show that at selected pixel place the demonstration that a picture signal reaches a given time cycle keeps step.In a traditional PDP, these two steps be by selected any level and vertical electrode among the discharge space using gases make medium, adopt negative glow discharge to realize.In other words, select a scan electrode and address electrode right, pulse voltage be applied to electrode pair one of them produces its different electrical characteristics to cause discharge at least, on the screen of being given, select one position (pixel) arbitrarily with this.Then, between scan electrode, apply a pulse voltage keeping discharge, thereby convert picture signal to will show light signal.Especially, the invention is characterized in, apply a sinusoidal wave pulse voltage keeping discharge cycle, be used for driving discharge and keep electrode and keep and show discharge.

Fig. 6 is the synoptic diagram that is used for according to a kind of method that applies a sinusoidal wave pulse of PDP driving method of the present invention.As shown in the drawing, in PDP driving method according to the present invention, a sine voltage with 180 ° of phase differential is applied to discharge of formation and keeps on the scan electrode (Y electrode) and common electrode (X electrode) of electrode, keeps with this to show discharge.By such operation, keep discharge for one and occur continuously, compare with the situation that adopts square-wave voltage to keep the demonstration discharge, reaching better effect aspect brightness and the driving efficient.In other words, repeat off and on based on the discharge condition of keeping of square-wave pulse, the application's the discharge condition of keeping based on sinusoidal wave pulse is worked continuously, therefore in brightness with drive displaying excellent characteristic aspect the efficient.

Fig. 7 is the synoptic diagram that is used for according to the another kind of method that applies a sinusoidal wave pulse of PDP driving method of the present invention, wherein proposes a kind of and common electrode (X electrode) applied a high sine voltage and scan electrode (Y electrode) is not applied voltage keeps a kind of method that shows discharge.

Because PDP is a bistable display spare, the gray shade scale demonstration reaches by the control discharge cycle.

As mentioned above,,, keeping discharge and carrying out continuously, therefore, obtaining good brightness and drive efficient by showing that the keeping of being kept of discharging applies a sine voltage in the discharge cycle according to PDP driving method of the present invention.

Claims

1. method that is used to drive low-power consumption plasma display (PDP), this display panel has by many discharges that scan electrode and common electrode are formed keeps electrode, and address electrode is provided with to such an extent that to keep electrode perpendicular with discharge, this method is characterised in that, in order to show a frame picture, this frame is divided into a plurality of sons field, to show its grey level, each height field comprises an initial period, an address cycle and a continuous discharge cycle, and keeps electrode in the continuous discharge cycle to discharge and apply a sine voltage.

2. method according to claim 1 is characterized in that, described put on scan electrode to public electrode on sine voltage have 180 ° phase differential.

3. method according to claim 1 is characterized in that, described scan electrode ground connection, and described sine voltage only puts on the public electrode.