CN1941256A

CN1941256A - Plasma display screen

Info

Publication number: CN1941256A
Application number: CNA2005100947924A
Authority: CN
Inventors: 崔正泌
Original assignee: LG Electronics Nanjing Plasma Co Ltd
Current assignee: LG Electronics Nanjing Plasma Co Ltd
Priority date: 2005-09-30
Filing date: 2005-09-30
Publication date: 2007-04-04

Abstract

A plasma display plank can be steadily operated with high-density and high temperature condition by improving structure of electrode to faceplate. It relates to Y electrode to offer scan pulse and sustaining pulse, and Z electrode to offer sustaining pulse in turn of Y electrode. The Z electrode includes some Z electrodes in complex number and is separated into n groups. When adding voltage to the Z electrode of x group among the n groups (1<=x<=n,and x is natural number), add voltage to the Z electrode of 1 group to x-1 group, and the Z electrode of x+1 group to n group is grounding level. It prevents loss of wall charge to Z electrode with high-density and high temperature condition by improving structure of Z electrode to plank, and enhances driving efficiency to get steady picture.

Description

Plasma panel

Technical field

The present invention relates to plasma panel, more specifically say so, make the plasma panel that under high image resolution and hot conditions, also can carry out stable operation by improving the electrode structure of panel.

Background technology

Usually, the apparatus structure of plasma panel (Plasma Display Panel) is: the partition wall that is provided with between the front glass of soda lime glass material and the back glass forms the unit (cell) of a unit, in each unit, neon (Ne), helium (He) or neon and helium gas mixture body (Ne+He) are used as main discharge gas, when the inert gas that adds small amount of xenon (Xe) is subjected to high frequency voltage effect discharge, produce vacuum ultraviolet (Vacuum ultraviolet rays), make the light-emitting phosphor that is arranged between the partition wall, thereby form image.

Above-mentioned plasma panel is compared with the leonard's tube (CRT) that is existing display device main flow always, and is simple in structure, make easily, and profile is very thin, is display unit of new generation, enjoys common people to pay close attention to.

Fig. 1 is the apparatus structure skeleton diagram of common plasma panel.As shown in Figure 1, plasma panel is by the front panel 10 of show image with form the small interval of rear board 20 distances of back and combine abreast.

The lower end of front panel 10 is provided with keeps electrode 11, is used for the pixel separately, by scan electrode Y electrode with keep the mutual creeping discharge effect of electrode Z electrode and holding unit luminous.Keep the bus electrode 11b that electrode 11 disposes the transparency electrode 11a that made by transparent ITO material and makes with metal material for the resistance value that reduces transparency electrode, be arranged to two.

The above-mentioned electrode 11 of keeping is present in electric inducing layer 12 inside.

Above-mentioned electric inducing layer plays the restriction discharging current and makes between two electrodes to insulate.

Be provided with below the electric inducing layer 12 and can in the ion sputtering (sputtering) that discharge causes, protect electric inducing layer, and be coated with magnesium oxide (Mgo) diaphragm 13, so that be easy to generate secondary electron.

In order to form plural discharge space on the electric inducing layer of plate 20 in the back is the unit, and partition wall 21 is being arranged in parallel.Partition wall 21 shown in Figure 1 is striped formula (stripe type), also has the form of other partition wall, and the well formula (well type) of the lattice shape of cross wall and perpendicular partition wall is promptly arranged.

Image showed R, G, the B fluorescence coating 23 with visible rays when coating can be emitted address discharge between the partition wall 21.

In the space between partition wall 21, by above-mentioned keep electrode 11 and with the addressing electrode 22 of its rear board that intersects 20 be the X electrode, carry out addressing (addressing) discharge, and produce vacuum ultraviolet.

Fig. 2 is the drive waveforms schematic diagram of common plasma panel.As shown in Figure 2, the rising in this drive waveforms (set up), decline (set down) and addressing (addressing) waveform are by the following effect of interval performance.

At first, in first transition, apply slope (ramp) waveform of high pressure, accumulation (+) wall electric charge on Z, the X electrode, accumulation (-) wall electric charge then on the Y electrode to the Y electrode.

Secondly, in the last transition, by the effect of above-mentioned rising pulse, excessively the wall electric charge of accumulation reduces inchmeal, formation can be between addressed area the state of stable discharging.

Once more, in between addressed area, the effect of the scanning impulse (scan pulse) by the Y electrode and the data pulse (data pulse) of X electrode produces address discharge, keep Vs voltage on the Z electrode this moment, and the Vs voltage of Z electrode is kept the voltage that does not produce discharge with the scanning impulse of Y electrode.

Drive the existing type of drive of plasma panel by above-mentioned driving process, realizing higher resolution, produce following problem when perhaps under hot conditions, driving.

Fig. 3 is when driving plasma panel by existing type of drive, the problem schematic diagram that produces when driving under high image resolution or hot conditions.

Above-mentioned Fig. 3 shows: t1, t2, t3 interval as the addressing of panel before semiosis at the discharge process of same unit inside, the t4 interval as the addressing of panel after the discharge process of the different inside, unit in semiosis and t1, t2, unit, t3 interval.

As shown in Figure 3, the interval effect of the t1 of Fig. 3 by the discharge of rising, accumulation (-) wall electric charge on the Y electrode, accumulation (+) wall electric charge forms (+) electric charge on the Z electrode on the X electrode.Secondly, among Fig. 3, the interval effect of t2 by the rising pulse, excessively the wall electric charge of accumulation is present in inside, unit equably by the discharge that descends.The interval expression of t3 among Fig. 3 addressing initial stage process produces discharge normally.

But the t4 interval of Fig. 3 is the back semiosis of addressing, and expression inside, unit does not produce address discharge.

In the driving method of common plasma panel, when scanning (scan) order is set from the top down the direction of panel for,

Do not produce the reason of address discharge, promptly produce the reason that misplaces electricity many kinds are arranged, but when showing high image resolution, the high more address period of the resolution of plasma panel is just long more, so later half scan line (scan line) through after many times, produces address discharge, compared with preceding half scan line at reset pulse (reset pulse), keep long wall electric charge, thereby have the unfavorable conditions that cation and anion carry out natural combination.

Therefore, the problem that later half scan line exists is: the wall electric charge that forms by the reset pulse effect is along with the process of time is lost, as what see in the t4 interval of Fig. 3, owing to wall electric charge deficiency causes can not producing discharge with the voltage at scanning initial stage.

The problem of this wall loss of charge not only takes place in the high image resolution situation, and plasma panel also takes place when moving under hot environment easily.

Summary of the invention

The present invention finds out in order to address the above problem, and purpose is to improve the electrode structure of panel, improves to drive efficient, to guarantee also to carry out stable action under high image resolution and hot conditions.

To achieve these goals, plasma panel of the present invention comprises, the Y electrode part that is used to apply scanning impulse and supports pulse, with the Z electrode part that is used for applying in turn support (sustain) pulse with above-mentioned Y electrode part, described plasma panel is characterized as: above-mentioned Z electrode part comprises plural Z electrode, and above-mentioned plural Z electrode is divided into n group.

In addition, its feature also comprises: at sweep interval, when the x that in said n group, selects (during Z electrode application voltage in the group of 1≤x≤n), to the 1st group of Z electrode application voltage to the x-1 group, and x+1 to organize the Z electrode of organizing to n be earth level.

Effect of the present invention is: by improving the Z electrode structure of plasma panel, also can prevent the wall loss of charge of Z electrode under high image resolution and hot conditions, improve driving efficient, thereby obtain stable image quality.

Description of drawings

Fig. 1 is the apparatus structure skeleton diagram of common AC type plasma panel.

Fig. 2 is the drive waveforms schematic diagram of existing AC type plasma panel.

Fig. 3 is the problem schematic diagram of existing AC type plasma panel type of drive.

Fig. 4 is the electrode structure schematic diagram of plasma panel of the present invention

Fig. 5 is the type of drive schematic diagram as the plasma panel that improves the Z electrode structure of the present invention the 1st embodiment.

Fig. 6 is the type of drive schematic diagram as the plasma panel that improves the Z electrode structure of the present invention the 2nd embodiment.

Fig. 7 is the type of drive schematic diagram as the plasma panel that improves the Z electrode structure of the present invention the 3rd embodiment.

Fig. 8 is the type of drive schematic diagram as the plasma panel that improves the Z electrode structure of the present invention the 4th embodiment.

* accompanying drawing major part symbol description *

10: 11: the 1 electrodes of front panel, keep electrode

12: electric inducing layer 13: diaphragm

20: rear board 21: partition wall (or spaced walls)

22: the 2 electrodes, addressing electrode 23:R, G, B fluorescence coating

Embodiment

With reference to the accompanying drawings specific embodiments of the invention are described.

＜embodiment 〉

Fig. 4 is an electrode structure schematic diagram of the present invention, and it is single sweep (single scan) situation schematic diagram, and the direction setting of scanning becomes direction from top to bottom.As shown in Figure 4, in plasma panel, the Z dividing electrodes is become n group, promptly organize n group for the 1st, promising show image between above-mentioned group and selecteed x group.

The Z electrode of x group is kept the drive waveforms identical with the mode that has now, and the Z electrode from the x+1 group to the n group is kept earth level at the Z electrode address period t3 of above-mentioned x group.

Behind rising t1, decline t2 interval, the x group just welcomes the interval t3 of address discharge at once, so at this moment behind reset pulse, the loss of wall electric charge reduces, and moves according to the waveform identical with existing mode.

But the group from x+1 group to n is according to scanning sequency, during welcoming address discharge t4 behind the address period t3 of upside group, so do not move at the address period t3 of upside group but wait for.So-called upside group is meant from the 1st group to x and organizes.At t3 this period, the cation of inside, unit and anion natural combination cause the wall loss of charge.

Therefore, after the decline process, the voltage of keeping earth level for x+1 group to the Z electrode of n group is to prevent to be accumulated in (+) wall loss of charge on the Z electrode.

After this, when x+1 group to n group welcomes the interval t4 of address discharge, apply to x+1 group to the Z electrode of n group and to support that voltage drives display screen.

That is, above-mentioned x+1 group is kept earth level to the Z electrode voltage of n group for preventing the wall loss of charge, then applies support voltage in the x+1 group to t4 between the relevant addressed area of n group.

As shown in Figure 6, above-mentioned x+1 group is to the Z electrode voltage of n group, and t3 is in earth level to the free voltage of supporting between voltage between the addressed area of above-mentioned x group.

That is,, also can keep (+) wall electric charge of Z electrode by with respect to supporting the low voltage effect of voltage.

Fig. 7 is the type of drive schematic diagram of the plasma panel that improves the Z electrode structure of the 3rd embodiment according to the present invention.

As shown in Figure 7, the same with the type of drive of above-mentioned Fig. 5, such as above-mentioned x+1 group and n group, during t4 between the addressed area of x+1 group, the Z electrode voltage of n group is kept earth level to the free voltage of supporting between voltage.At the address period t5 of above-mentioned n group, the Z electrode of all upside groups is kept support voltage, and the Z electrode of above-mentioned n group is also kept support voltage.

As shown in Figure 8, above-mentioned x+1 group is same voltage to the Z electrode voltage of n group at the address period t3 of last transition t2 and above-mentioned x group.Therefore, it is slower than the x group that it carries out address period, from then on can prevent the wall loss of charge that causes thus.

Be assumed to single scan mode though improve the scan mode of the above-mentioned plasma panel of Z electrode structure, the present invention is equally applicable to the plasma panel of two scan modes.

That is, the plasma panel of two scan modes also can reach the effect that prevents the wall loss of charge, improves driving efficient by the structure of improving the Z electrode.

Affiliated field professional can be implemented as other concrete form to technology formation of the present invention fully under the situation that does not change technological thought of the present invention or requisite feature.

Claims

1, a kind of plasma panel comprises the Y electrode part that is used to apply scanning impulse and supports pulse, and applies the Z electrode part of supporting pulse in turn with above-mentioned Y electrode part, described plasma panel, and its feature comprises:

Above-mentioned Z electrode part comprises plural Z electrode;

Above-mentioned plural Z electrode is divided into n group;

When the Z electrode application voltage in x (1≤x≤n, x the are natural numbers) group of selecting in said n group at sweep interval, to the 1st group of Z electrode application voltage to the x-1 group, and x+1 group to the Z electrode that n organizes is an earth level.

2, plasma panel according to claim 1 is characterized in that:

Above-mentioned x+1 group is kept earth level earlier to the Z electrode voltage of n group, and when be in the x+1 group between the relevant addressed area of n group in the time, then be support voltage.

3, plasma panel according to claim 1 is characterized in that:

The Z electrode voltage of above-mentioned x+1 group to the n group is in earth level to the free voltage of supporting between voltage between the addressed area of above-mentioned x group.

4, plasma panel according to claim 1 is characterized in that:

Above-mentioned x+1 group is in earth level to the free voltage of supporting between voltage to the interior Z electrode voltage of n group in the last transition.

5, plasma panel according to claim 1 is characterized in that:

Above-mentioned x+1 group is to the voltage of the Z electrode of n group, is in same voltage between the addressed area of last transition and above-mentioned x group.

6, plasma panel according to claim 1 is characterized in that:

The scan mode of above-mentioned plasma panel adopts the arbitrary mode in single sweep or the two scanning.