CN1328333A

CN1328333A - Plasma display

Info

Publication number: CN1328333A
Application number: CN00118343A
Authority: CN
Inventors: 许国彬
Original assignee: DAQI SCIENCE AND TECHNOLOGY Co Ltd
Current assignee: DAQI SCIENCE AND TECHNOLOGY Co Ltd
Priority date: 2000-06-14
Filing date: 2000-06-14
Publication date: 2001-12-26

Abstract

A plasma display is composed of mutually parallel front and back substrates, several pairs of the first and the second electrodes arranged on the front substrate in the first direction, and several barrier walls arranged on the back substrate in the second direction perpendicular to the first direction. A discharge unit consists of two adjacent barrier walls, one first electrode and one second electrode. Each of the first electrodes has two peaks near the center of discharge unit. When a voltage is applied across the first and the second electrodes, the charges are gathered at two peaks of the first electrode to generate the initial plasma in the conter of discharge unit.

Description

Plasma scope

The present invention relates to a kind of plasma scope, particularly a kind of plasma scope that can produce initial plasma by the discharge cell centre.

Plasma scope is used to make large scale and large-area display unit gradually.The principle of luminosity of plasma scope is to produce ultraviolet light by plasma, is radiated on the fluorophor, sends visible light by fluorophor again.The generation efficient of plasma influences the luminous efficiency of plasma scope dearly.Promote the aforementioned arbitrary luminous step of putting forward, all can improve the luminous efficiency of plasma scope, but with present technology, the luminous efficiency of raising fluorescent material itself also is not easy.On the other hand, the generation of increase ultraviolet light also can improve the luminous efficiency of plasma scope.The method that improves plasma generation efficient is except changing the gas of being filled at present, and the electrode structure that also can change plasma scope improves the efficient of plasma generation.

With reference to Fig. 1 and Fig. 2, Fig. 1 is the schematic diagram of known plasma scope 10, and Fig. 2 is the top view of the discharge cell 34 of plasma scope 10 shown in Figure 1.As shown in Figure 1, and known plasma scope (plasma display panel, PDP) 10 include a housing (not shown), and a front substrate (front plate) 12 and one back substrate (rear plate) 14 vertically is installed in the housing.Front substrate 12 is parallel to each other with back substrate 14, and front substrate 12 can be a transparency carrier.

Front substrate 12 is provided with many to first electrode 16 and second electrode 17, and it is located on the front substrate 12 abreast along a direction 18.One protective layer 20 is made of magnesium oxide (MgO) usually, is located on the front substrate 12 and coated

electrode

16,17, produces the discharge electronics simultaneously with guard electrode.Then being provided with a plurality of barrier ribs (rib) 22 on the back substrate 14 is located on the back substrate 14 with the perpendicular direction 24 of direction 18 abreast along one, a plurality of data (data) electrode 26 is located between the barrier rib 22 abreast along direction 24, and the fluorophor of three kinds of different colours (phoshor), comprise that redness, green and blue emitting

phophor

28,30,32 insert between adjacent two barrier ribs 22 in order.Form a discharge cell (discharge cell) 34 between every adjacent two barrier ribs 22 and each electrode pair 16.

Each electrode package of first electrode 16 and second electrode 17 contains an auxiliary electrode 36 and keeps electrode 38.Each is kept electrode 38 and is electrically connected on an auxiliary electrode 36 and extends to the middle part of discharge cell 34.Auxiliary electrode 36 is a metal electrode, is formed by chromium-copper-chromium usually, causes discharge with the auxiliary electrode 38 of keeping, and can reduce the resistance of keeping electrode 38.Keep that electrode 38 can (indium tin oxide ITO) constitutes, and can reduce the starting resistor of discharge cell 34 when producing plasma by tin indium oxide.

When applying a voltage between first electrode 16 in the discharge cell 34 and second electrode 17, an electric field can be formed, between corresponding two electrodes in a discharge cell 34 to cause the generation of the plasma in the discharge cell 34.As shown in Figure 2, because first electrode 16 and second electrode 17 are the shape that is parallel to each other, initial plasma may produce the optional position in parallel pole, and the position that therefore initial plasma produced in single discharge cell is (randorn) at random.For example, initial plasma may be created between the shortest point 1 of distance and the point 2, or is created between long point 3 of distance and the point 4.If the generation position of initial plasma is quite near barrier rib, even might cross over barrier rib 22, point 5 with put 6 between produce initial plasma.In case put 5 and point produce initial plasma between 6, two discharge cells are lighted simultaneously, cause discharge cell to disturb the phenomenon of (cross-talk), and then make the picture of plasma scope noise occur.

In addition, the size and the resolution of plasma scope all improve constantly at present, make each electrode will drive more discharge cells 34, and be luminous to produce plasma.Therefore, under the constant state of the starting voltage of each discharge cell 34, the energy that each electrode transmitted can consume rapidly along with the increase of discharge cell, make partial discharge unit 34 lack enough energy and produce plasma, and on the phosphor screen of plasma scope 10, stain occurs.Yet only increase the energy that is transmitted on each electrode, can cause the overheated problem of plasma scope 10.Therefore, the starting resistor of plasma scope 10 must further reduce, and just can avoid stain occurring on the phosphor screen of plasma scope 10.

Therefore main purpose of the present invention is to provide a kind of plasma scope that can be produced initial plasma by the middle part of discharge cell, reduces the starting resistor of plasma scope and avoids phenomenon interfering with each other between discharge cell.

For realizing described purpose, the invention provides a kind of plasma scope, it includes: a front substrate; One back substrate, parallel with this front substrate; Many to first electrode and second electrode, this first electrode and this second electrode are to be located at abreast on this front substrate along a first direction; And a plurality of barrier ribs, to be located at abreast on this back substrate along a second direction, this first direction is perpendicular with this second direction; Wherein by per two adjacent barrier ribs and one first electrode, one second electrode definition, one discharge cell; Wherein this first electrode is being provided with a breach near this discharge cell centre, makes this first electrode form two summits near this discharge cell centre; When adding a pressure drop between this first electrode and this second electrode the time, the charge concentration of this first electrode can be produced the initial plasma of discharge cell earlier on this two summit by this discharge cell centre.

Fig. 1 is the schematic diagram of known plasma scope.

Fig. 2 is the top view of the discharge cell of plasma scope shown in Figure 1.

Fig. 3 is the schematic diagram of plasma scope of the present invention.

Fig. 4 is the top view of the discharge cell of plasma scope shown in Figure 3.

Fig. 5 to Figure 10 is the top view of other embodiment of the discharge cell of plasma scope of the present invention.

With reference to Fig. 3 and Fig. 4, Fig. 3 is the schematic diagram of plasma scope 50 of the present invention, and Fig. 4 is the top view of the discharge cell 74 of plasma scope 50 shown in Figure 3.As shown in Figure 3, the present invention is a kind of plasma scope 50 that can be produced initial plasma by the middle part of discharge cell, it comprises a front substrate 52 (foont plate), a back substrate 54 (rear plate), and this back substrate 54 is parallel with front substrate 52.

Front substrate 52 is provided with manyly to be located on the front substrate 52 along a direction 58 abreast to first electrode 56 and second electrode 57, and a protective layer 60, is made of magnesium oxide usually, is located on the front substrate 52 and coated electrode 56,57.Then being provided with a plurality of barrier ribs (rib) 62 on the back substrate 54 is located on the back substrate 54 abreast along a direction 64 vertical with direction 58, on a plurality of data (data) electrode 66 is located at back substrate 14 between the barrier rib 62 abreast along direction 64, and three redness,

green fluorophor

68,70,72 with blueness are coated between the two adjacent barrier ribs 62 in order.And form a discharge cell (displaycell) 74 between the per two adjacent barrier ribs 62 and first electrode 56, second electrode 57.

Basic structure of the present invention is to make first electrode 56 be provided with a breach near discharge cell 74 centre, makes first electrode 56 form two summits 81,83 near discharge cell 74 centre.When adding a pressure drop at 57 at first electrode 56 and second electrode, the electric charge of first electrode 56 can concentrate on two summits 81,83, then form big electric fields in corresponding discharge cell 74 central authorities between first electrode 56, second electrode 57, make the initial plasma of discharge cell 74 to produce by discharge cell 74 centre earlier.

First specific embodiment all comprises with reference to each electrode in Fig. 3,4, the first electrodes 56 and second electrode 57 and to keep an electrode 78 and an auxiliary electrode 76.First electrode 56 respectively is provided with a mutual corresponding breach 80 with the electrode 78 of keeping of second electrode 57 in the centre near discharge cell 74, breach 80 squarish and extend to auxiliary electrode 76 places by keeping electrode 78; That is breach 80 runs through and keeps electrode 78 in first electrode 56 and second electrode 57, makes two to keep electrode 78 be cut into four independent blocks in each discharge cell 74.Breach 80 forms four summits 81,82,83 and 84 respectively on first electrode 56 and second electrode 57.Because the principle of point discharge, summit 81,82,83 with 84 neighbouring can the bigger electric field of generation intensity, make summit 81,82,83 and 84 near be easier to produce initial plasma.For example, initial plasma may be created in a little 81 and point 82 between, or be created in a little 83 with point 84 between, even between also might and putting 84 at point 81 or put 83 and put 82 between produce initial plasma.Therefore, plasma scope 50 of the present invention can produce initial plasma in the middle part of discharge cell 74, takes place with the phenomenon of avoiding 74 interference of discharge cell.

With reference to Fig. 5 to Figure 10, Fig. 5 to Figure 10 is the top view of other embodiment of the discharge cell 74 of plasma scope 50 of the present invention.Fig. 5 to Fig. 7 main difference is improved the breach design that is first electrode 56 or second electrode 57.As shown in Figure 5, plasma scope 50 of the present invention can only form breach 80a on first electrode 56.As shown in Figure 6, breach 80b does not extend to auxiliary electrode 76 by the electrode 78 of keeping of first electrode 56 or second electrode 57, that is breach 80 does not run through two and keeps electrode 78.Plasma scope 50 of the present invention also can form the breach 80c as Fig. 7 in conjunction with the design of Fig. 5 and Fig. 6.In addition, the breach of transparency electrode 78 leading edges also differs and is decided to be squarely, can be designed as the breach 80d of approximate ladder type as shown in Figure 8, or is designed to the breach of circular (not shown).In addition, as Fig. 9 and shown in Figure 10, in order to improve the brightness of plasma scope 50, comprise in first electrode 56 or second electrode 57 be designed to hollow out keep electrode 78, to reduce the light transmittance area of keeping electrode 78 on the low side.

The characteristics of plasma scope 50 of the present invention are that first electrode 56 in each discharge cell 74 is provided with breach 80, make and form summit or wedge angle 81,83 on the electrode 56 of winning.Because the effect of point discharge, though the not increase of

first electrode

56 and 57 voltages of second electrode, also can be near wedge angle the bigger electric field of generation.Near the wedge angle electric field can impel the gas ionization of the central part of discharge cell 74, and then produces initial plasma and penetrate ultraviolet light, makes the fluorophor of discharge cell 74 send visible light.Therefore plasma scope 50 can be guaranteed to produce initial plasma at the central part of discharge cell 74, also keeps relatively large plasma at the central part of discharge cell 74 simultaneously, and the phenomenon that therefore can avoid discharge cell to disturb takes place.

In addition, because data electrode 66 is arranged on barrier rib 62 central authorities of back substrate, just be arranged on the central authorities of corresponding discharge cell.And whether the signal of telecommunication on the data electrode 66 is to be used to control plasma generate, and just is used to control the light and shade of discharge cell.When a large amount of plasmas maintain discharge cell when central authorities,, so light or the controlling mechanism of extinguishing each discharge cell becomes more accurate because plasma and data electrode be apart from shortening.

Plasma scope 50 of the present invention utilizes the summit 81,83 on first electrode 56 to improve the electric field of 56,57 at electrode, therefore plasma scope 50 does not need to use higher starting resistor, can produce initial plasma and make discharge cell 74 luminous.Even the number of discharge cell 74 increases, each strip electrode 56 still can have enough energy to light each discharge cell 74.If the number of discharge cell 74 does not increase, the starting resistor of plasma scope 50 then can further reduce, to avoid the overheated problem of plasma scope 50.

Compare with known plasma scope 10, plasma scope 50 of the present invention is provided with breach 80 on first electrode 56, makes the electrode 57 of winning form summit 81,83 near corresponding discharge cell centre.Utilize the point discharge effect, the present invention can guarantee that initial plasma produces in the middle part of discharge cell 74, lights another discharge cell in order to avoid initial plasma produces at the edge of discharge cell.In addition, because the summit near zone on the electrode can produce higher electric field, so plasma scope of the present invention can reduce starting resistor, can avoid stain occurring on the phosphor screen of plasma scope.

The above preferred embodiment only of the present invention, all equalizations of being done according to claim scope of the present invention change and modify, and all should belong to claim of the present invention institute covering scope.

Claims

1. plasma scope, it includes:

One front substrate;

One back substrate, parallel with this front substrate;

Many to first electrode and second electrode, this first electrode and this second electrode are to be located at abreast on this front substrate along a first direction; And

A plurality of barrier ribs are located on this back substrate abreast along a second direction, and this first direction is perpendicular with this second direction;

Wherein by per two adjacent barrier ribs and one first electrode, one second electrode definition, one discharge cell;

Wherein this first electrode is being provided with a breach near this discharge cell centre, makes this first electrode form two summits near this discharge cell centre;

When adding a pressure drop between this first electrode and this second electrode the time, the charge concentration of this first electrode can be produced the initial plasma of discharge cell earlier on this 2 thick point by this discharge cell centre.

2. plasma scope as claimed in claim 1, wherein this breach is the breach of a squarish.

3. plasma scope as claimed in claim 1, wherein this first electrode comprises one dimension and holds an electrode and an auxiliary electrode.

4. plasma scope as claimed in claim 3, wherein this breach is positioned at and keeps on the electrode.

5. plasma scope as claimed in claim 4, wherein this breach runs through the electrode of keeping of this first electrode, makes the electrode of keeping of this first electrode be cut into two independent blocks in this discharge cell, and relies on the auxiliary electrode conducting of this first electrode.

6. plasma scope as claimed in claim 1, wherein this first electrode has a hollow out zone, to increase this discharge cell light transmittance.