CN1141689C - A method for driving a plasma display panel - Google Patents

Abstract

The present invention discloses a drive working mode which is designed aiming at a groove-shaped plasma display panel and is used for erasing through scanning waveforms. The present invention mainly comprises the original basic working waveforms, such as scanning waveforms, holding waveforms and erasing waveforms, and necessary working waveforms which are simplified by the design. The present invention is suitable for the groove-shaped plasma display panel, the working waveforms are simplified, the displaying efficiency is improved, and thereby, the brightness and contrast of the plasma display panel are improved.

Description

A kind of driving method of plasma display panel

(1) technical field:

The invention belongs to Plasma Display Technology, relate in particular to the driving method of plasma display panel.

(2) background technology:

As shown in Figure 1, the structure of the groove type plasma display panel of prior art mainly is made of metacoxal plate 1, aperture plate plate 3 and prebasal plate 2.Metacoxal plate 1 comprises back substrate glass substrate 4, film first electrode 5 (row electrode, addressing electrode) that forms on back substrate glass substrate 4, the insulation course 6 that forms on back substrate glass substrate 4; Prebasal plate 2 comprises preceding substrate glass substrate 8, form on preceding substrate glass substrate 8 lower surfaces with metacoxal plate 1 on second electrode 9 (column electrode, scan electrode) of 5 one-tenth spatial vertical quadratures of first electrode, the dielectric layer 10 that on the lower surface of second electrode 9, forms, the diaphragm 11 that on preceding substrate glass substrate 8 and dielectric layer 10, forms; The aperture plate plate 3 that is clipped between the front-back baseboard 1,2 is current-carrying plates (public electrode) that comprise the grid hole array.In grid hole, fill required working gas, just become the discharge cell space of this plasma display screen with certain air pressure.

For drive circuit system, be primarily aimed at electrode structure shown in Figure 2, on the electrode of different asynchronism(-nization)s, apply different voltage respectively, make this grooved plasma display screen finish image display function.Usually the memory-type drive waveforms scheme that adopts is to adopt three class groundwork waveforms to finish three kinds of functions that realize in the process gas discharge respectively at present.Three class groundwork waveforms are respectively sweep waveforms, keep waveform and wipe waveform.Sweep waveform be in order to make the discharge cell space that does not originally begin gas discharge cause gas discharge on each electrode added voltage waveform; Keep waveform and be in order to make the discharge cell space that begins gas discharge keep the gas discharge state added voltage waveform on each electrode; Wiping waveform is the voltage waveform that is applied on each electrode in order to make the discharge cell space that begins gas discharge stop the charged particle in gas discharge state, removing discharge cell space.

Sequential mode when finishing video display function and must rely on the certain discharging of groundwork waveform.The time of sweep waveform work is called sweep time, and the time of keeping waveform work is called the phase of keeping, and the time of wiping waveform work is called erasing period.Fig. 3 has provided the groundwork waveform sequential of traditional memory-type drive scheme.With sweep time, the phase of keeping and erasing period series arrangement, each is organized sweep time, the phase of keeping and erasing period and constitutes a son field successively.Contain a plurality of sons field at a frame time,, rely on the combination of corresponding son field, just can in a frame time, show certain gray shade scale because the phase of keeping time length of each son field is variant.

Because the groundwork principle of erasing pulse is to make non-abundant discharge process of discharge space generation, reaches the effect of discharge neutralization.So commonly used to wipe waveform general narrower or lower than keeping pulse height than keeping pulse.And a kind of high frequency interference of can introducing of these two kinds of schemes, the another kind of requirement provides one group of power supply amplitude more, all can strengthen the complex circuit designs degree.As long as suitably adjust the scanning impulse waveform, also can realize similar neutralization.

(3) summary of the invention:

Because the light characteristic of plasma display panel (PDP) relies on the ratio of the phase of the keeping same frame time of time that shows a two field picture, i.e. display efficiency to a great extent.Fundamental purpose of the present invention is in order to improve the driving efficient of grooved plasma display screen, to simplify drive waveforms simultaneously.

Technical scheme of the present invention is the erasing period in each height field of cancellation, utilizes the scanning impulse of sweep time to finish the erase feature to discharge cell that former cause erasing pulse is finished.Concrete grammar is to adopt column electrode and row electrode to apply generating positive and negative voltage respectively as scanning impulse, and when scanning a certain pixel, if this pixel request is lighted, then the stack of the generating positive and negative voltage on column electrode and the row electrode reaches the ignition voltage amplitude, and pixel is lighted a fire; If this pixel is not required to light, at this moment column electrode has scanning impulse, and the row electrode does not have corresponding firing pulse, keeps pulse because this scanning impulse amplitude is lower than, as long as amplitude is suitable, also may realize foregoing in and function, finish scrubbing action.Fig. 4 has provided the concrete drive waveforms sequential behind employing the present invention, and it is the same with original sequential, all a frame time is cut into the plurality of sub field, but all has only sweep time and keep the phase in each son field, does not have erasing period.Can prolong the working time of the phase of keeping thus, improve the work efficiency of device.

Negative scanning impulse appears in column electrode successively in sweep time, when scanning certain delegation, on the row electrode if positive firing pulse arranged, between corresponding line and row, form voltage difference greater than ignition voltage, then cause the gas discharge of the pixel of this column electrode and this row electrode crossings place correspondence, and only be subjected to the scanning impulse effect in the pixel of row electrode that does not have firing pulse and current line point of crossing correspondence, cause non-abundant discharge, the charged particle of this pixel discharge space that neutralizes.The voltage amplitude that it is characterized in that negative scanning impulse is smaller or equal to the added voltage amplitude of keeping of the phase of keeping, and with the ignition voltage of the voltage difference that lists added positive firing pulse greater than the unit.

Positive scanning impulse appears in column electrode successively in sweep time, when scanning certain delegation, on the row electrode if negative firing pulse arranged, then cause the gas discharge of the pixel of this column electrode and this row electrode crossings place correspondence, and only be subjected to the scanning impulse effect in the pixel of row electrode that does not have firing pulse and current line point of crossing correspondence, cause non-abundant discharge, the charged particle of this pixel discharge space that neutralizes.The voltage amplitude that it is characterized in that positive scanning impulse is smaller or equal to the added voltage amplitude of keeping of the phase of keeping, and with the ignition voltage of the voltage difference that lists added negative firing pulse greater than the unit.

Beneficial effect of the present invention: improved the driving efficient of grooved plasma display screen, simplified drive waveforms simultaneously, thereby improved the brightness and contrast of plasma panel.

(4) description of drawings:

Fig. 1 is the structural representation of groove type plasma display panel

Fig. 2 is a grooved plasma display screen electrode relative position distribution synoptic diagram

Fig. 3 is a conventional store formula drive scheme scheduling synoptic diagram

Fig. 4 is a memory-type drive scheme scheduling synoptic diagram behind the cancellation erasing period

Fig. 5 is the negative scanning impulse and positive firing pulse and corresponding luminous situation synoptic diagram of certain son field

Fig. 6 is positive scanning impulse and the negative firing pulse and the corresponding luminous situation synoptic diagram of certain son field

Fig. 7 is several sweep waveform synoptic diagram that may have good erase feature

Fig. 8 is several possible phase relation synoptic diagram between scanning impulse and the firing pulse

On the basis of foregoing invention, further consider concrete drive scheme, propose following examples.1. the structure of groove type plasma display panel mainly is made of metacoxal plate 1, aperture plate plate 3 and prebasal plate 2.Metacoxal plate 1 comprises back substrate glass substrate 4, film first electrode 5 (row electrode, addressing electrode) that forms on back substrate glass substrate 4, the insulation course 6 that forms on back substrate glass substrate 4; Prebasal plate 2 comprises preceding substrate glass substrate 8, form on preceding substrate glass substrate 8 lower surfaces with metacoxal plate 1 on second electrode 9 (column electrode, scan electrode) of 5 one-tenth spatial vertical quadratures of first electrode, the dielectric layer 10 that on the lower surface of second electrode 9, forms, the diaphragm 11 that on preceding substrate glass substrate 8 and dielectric layer 10, forms; The aperture plate plate 3 that is clipped between the front-back baseboard 1,2 is current-carrying plates (public electrode) that comprise the grid hole array.In grid hole, fill required working gas, just become the discharge cell space of this plasma display screen with certain air pressure.In procedure for displaying a frame time is divided into n son field, as shown in Figure 4, each son concrete demonstration time is difference to some extent, is combined to form required display gray scale by the son field.Comprise sweep time and keep the phase in each son field, the work wave of wherein keeping the phase is to apply alternating voltage between the row-column electrode group, voltage amplitude is kept the minimum voltage of discharge less than the igniting minimum voltage of all display units that make this display screen greater than all display units that make this display screen.The waveform of sweep time is shown in Fig. 5 a: negative scanning impulse appears in column electrode successively, its amplitude is smaller or equal to keeping voltage amplitude, up to having scanned all row, whether the row electrode goes out positive firing pulse according to the actual light and shade situation decision at corresponding sub-field period of the pixel of current line and column infall correspondence, and this positive firing pulse and negative scanning impulse form the voltage difference greater than the firing voltage of unit on respective display unit.If go out positive firing pulse, then this pixel is under the superposition of addressing pulse of negative row and positive firing pulse, be initiated the gas breakdown discharge, form space charge and wall voltage, keep keeping under pulse and the above-mentioned wall voltage effect of phase, make this pixel continuous discharge produce luminous or excitated fluorescent powder is luminous; If do not go out positive firing pulse, then the unit of original discharge causes non-abundant gas discharge under negative scanning impulse effect, in and the wall electric charge that accumulates on original charged particle and the wall in the space, afterwards keep pulse because amplitude is lower than ignition voltage, can not cause the space gas discharge separately; And originally have luminous unit since separately scanning voltage be not enough to cause the gas breakdown discharge, so keeping pulse and can not make this pixel Discharge illuminating afterwards.Fig. 5 b has provided that adjacent two row and certain two is listed in the waveform of certain sub-field scan phase and the luminous situation of corresponding pixel points in this sub-field time.2. in the above-described embodiments, if the waveform of sweep time is shown in Fig. 6 a: positive scanning impulse appears in column electrode successively, its amplitude is smaller or equal to keeping voltage amplitude, up to having scanned all row, whether the row electrode goes out negative firing pulse according to the actual light and shade situation decision in corresponding sub-field period of the pixel of current line and column infall correspondence, and this negative firing pulse and positive scanning impulse form the voltage difference greater than the firing voltage of unit on respective display unit.If go out negative firing pulse, then this pixel is initiated gas discharge, by after keep the pulse of keeping of phase and make this pixel luminous or excitated fluorescent powder is luminous; If do not go out negative firing pulse, then positive scanning impulse or cause non-abundant gas discharge, in and the space in original charged particle and wall voltage, or keep original state that extinguishes, the pulse of keeping afterwards is lower than ignition voltage owing to amplitude, can not cause the space gas discharge separately, so this pixel is not luminous in this child field; Fig. 6 b has provided that adjacent two row and certain two is listed in the waveform of certain sub-field scan phase and the luminous situation of corresponding pixel points in this sub-field time.3. the sweep waveform in the foregoing description can be a square wave, also can be sine wave, triangular wave, integrated waveform, trapezoidal and etc. other waveforms, as shown in Figure 7.4. the phase place between scanning impulse and the firing pulse can be identical in the foregoing description, also can misplace, and pulse width can be identical, also can be different, as shown in Figure 8.

Claims (6)

1. A driving method of a plasma display panel, aimed at a slot-shaped plasma display panel, the display panel is composed of a rear substrate, a grid panel and a front substrate, and is characterized in that one frame time is cut into several subfields, but Each subfield is only composed of a scanning period and a sustaining period. During the scanning period, negative scanning pulses appear on the row electrodes in turn. When a certain row is scanned, if there is a positive firing pulse on the column electrodes, a larger than The voltage difference of the ignition voltage will cause the gas discharge of the pixel corresponding to the intersection of the row electrode and the column electrode, while the pixel corresponding to the intersection of the column electrode without the ignition pulse and the current row is only affected by the scan pulse, causing abnormal Fully discharge to neutralize the charged particles in the discharge space of the pixel. 2. The driving method of a plasma display panel according to claim 1, wherein the voltage amplitude of the negative scan pulse is less than or equal to the sustain voltage amplitude applied in the sustain period, and is different from the positive ignition pulse applied on the column. The voltage difference of the pulse is greater than the firing voltage of the cell. 3. A driving method for a plasma display panel, aimed at a slot-shaped plasma display panel, the display panel is composed of a rear substrate, a grid panel and a front substrate, and is characterized in that one frame time is cut into several subfields, but Each subfield is only composed of a scan period and a sustain period. During the scan period, positive scan pulses appear on the row electrodes in sequence. When scanning to a certain row, if there is a negative ignition pulse on the column electrodes, the row electrodes and the column electrodes are activated. The gas discharge of the pixel point corresponding to the intersection point, while the pixel corresponding to the column electrode without ignition pulse and the intersection point of the current row is only affected by the scan pulse, causing insufficient discharge and neutralizing the charged particles in the discharge space of the pixel. 4. The driving method of a plasma display panel according to claim 3 is characterized in that the voltage amplitude of the positive scan pulse is less than or equal to the sustain voltage amplitude applied in the sustain period, and is different from the negative ignition pulse applied on the column. The voltage difference is greater than the firing voltage of the cell. 5. The driving method of a kind of plasma display panel according to claim 1 or 2, characterized in that in order to achieve a good erasing effect, the scanning waveform can be a square wave, or a sine wave, a triangle wave, an integral waveform, trapezoidal waveform. 6. A driving method for a plasma display panel according to claim 1 or 2, characterized in that in order to achieve a good erasing effect, the ignition pulse and the scan pulse can be of the same phase and pulse width, or can be of different phases, different pulse widths.

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