CN101548353B

CN101548353B - Plasma display panel

Info

Publication number: CN101548353B
Application number: CN2008800007588A
Authority: CN
Inventors: 河濑觉; 森冈一裕; 斋藤唯; 吉田信介; 三舩达雄
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2007-08-06
Filing date: 2008-08-04
Publication date: 2010-12-22
Anticipated expiration: 2028-08-04
Also published as: CN101548353A; CN101548354B; CN101548354A

Abstract

A plasma display panel is formed of a front panel including display electrodes, a dielectric layer, and a protective layer that are formed on a glass substrate, and a rear panel including electrodes, barrier ribs, and phosphor layers that are formed on a substrate. The front panel and the rear panel are faced with each other, and peripheries thereof are sealed to form a discharge space therebetween. The dielectric layer of the front panel contains Bi 2 O 3 and at least CaO and BaO, and the content expressed in mole% of CaO is greater than that of BaO.

Description

Plasm display panel

Technical field

The present invention relates to the middle plasm display panels that use such as a kind of display device.

Background technology

Plasm display panel (below, be called PDP) because can realize high-definition, big pictureization, so the TV of 100 inches levels etc. become commercialized.In recent years, advancing PDP was the application in the high definition TV more than 2 times to compare number of scanning lines (Walkthrough Line number) with existing NTSC mode, considered environmental problem simultaneously and the PDP that requires not contain lead composition also becomes commercialized.

PDP is made of front panel and backplate basically.Front panel comprises: the show electrode that the borsal by (float) manufactured of floating is the glass substrate of glass, be made of bar (stripe) shape transparency electrode that forms on side's interarea of this glass substrate and bus (bus) electrode, cover this show electrode and as the dielectric layer of capacitor work and the protective layer that is made of the magnesium oxide that forms (MgO) on this dielectric layer.On the other hand, backplate comprises: the address electrode of glass substrate, the strip that forms on side's interarea of this glass substrate, the substrate dielectric layer of overlay address electrode, the luminescent coating that sends redness, green and blue light respectively that forms in the next door that forms on the substrate dielectric layer and between each next door.

Front panel and backplate are enclosed the discharge gas of Ne-Xe making under the relative state of its electrode forming surface side by hermetic seal in the discharge space that is separated by the next door with the pressure of 55kPa～80kPa.PDP discharges by selectively image signal voltage being imposed on show electrode, and the luminescent coating ultraviolet ray exited of all kinds that produces by this discharge sends the light of redness, green, blueness, thereby realizes COLOUR IMAGE VISUALIZATION OF HE.

In order to ensure conductivity, the bus electrode of show electrode uses silver electrode, use with lead oxide to the low-melting glass of main component as dielectric layer, but in recent years, consider environmental problem, and disclose a kind of example (for example with reference to

patent documentation

1,2,3,4 etc.) that does not contain the dielectric layer of lead composition.

In recent years, because high definitionization, number of scanning lines increased, and the quantity of show electrode increases, and then show electrode diminishes at interval.Therefore, silver ion becomes many from the silver electrode that constitutes show electrode to the diffusion of dielectric layer or glass substrate.If silver ion is diffused in dielectric layer or the glass substrate,, thereby form silver colloid (colloid) then owing to the divalent tin ion that contains in alkali metal ion in the dielectric layer or the glass substrate is subjected to reduction.Consequently following problem becomes remarkable: and painted by force, simultaneous oxidation silver is subjected to reduction and produces oxygen, thereby produces bubble in dielectric layer by yellow or brown for dielectric layer or glass substrate.

Therefore, along with the increase of the quantity of scan line, the xanthochromia of glass substrate or the generation of the bubble in the dielectric layer become more remarkable, and the problem that the significantly impaired and dielectric layer of picture quality produces defective insulation becomes remarkable.

Patent documentation 1: TOHKEMY 2003-128430 communique

Patent documentation 2: TOHKEMY 2002-053342 communique

Patent documentation 3: TOHKEMY 2001-045877 communique

Patent documentation 4: Japanese kokai publication hei 9-050769 communique

Summary of the invention

PDP of the present invention is front panel that has formed show electrode, dielectric layer and protective layer on the glass substrate and relative configuration of backplate that has formed electrode, next door and luminescent coating on substrate; and seal on every side and form the PDP of discharge space, the dielectric layer of front panel contains Bi ₂O ₃And contain CaO and BaO at least, and the content of representing with molar percentage of CaO is more than the content of representing with molar percentage of BaO, and described dielectric layer also contains K ₂O, and contain from Na ₂O or Li ₂More than one that select among the O, K ₂The content of representing with molar percentage of O compares from Li ₂O or Na ₂The total of the content of representing with molar percentage of more than one that select among the O is many, and described dielectric layer also contains CoO and CuO, 0.03%～0.3% the scope of being aggregated in of the content of representing with molar percentage of CoO and CuO.

According to such structure, can realize a kind ofly not producing xanthochromia, kept the straight line transmitance, PDP environmental protection, that guarantee high briliancy and high reliability.

Description of drawings

Fig. 1 is the stereogram of structure of the PDP of expression embodiments of the present invention;

Fig. 2 is the profile of structure of the front panel of this PDP of expression;

Symbol description:

1-PDP; The 2-front panel; 3-front glass substrate; The 4-scan electrode; 4a, 5a-transparency electrode; 4b, 5b-metal bus electrode; 5-keeps electrode; The 6-show electrode; 7-secret note (black stripe) (light shield layer); The 8-dielectric layer; The 9-protective layer; The 10-backplate; 11-back side glass substrate; The 12-address electrode; 13-substrate dielectric layer; The 14-next door; The 15-luminescent coating; The 16-discharge space.

Embodiment

Below, use accompanying drawing that the PDP of embodiment of the present invention is described.

(execution mode)

Fig. 1 is the stereogram of structure of the PDP of expression embodiment of the present invention.The basic structure of PDP is identical with general interchange surface discharge type PDP.As shown in Figure 1, in PDP1, disposed in opposite directions by front glass substrate 3 grades front panel 2 that constitutes and the backplate 10 that is made of back side glass substrate 11 grades, the outer peripheral portion of PDP1 is by the encapsulant hermetic seal, and described encapsulant is by glass dust formations such as (glass frit).In the discharge space 16 of PDP1 inside of sealing, enclosing with the pressure of 55kPa～80kPa has discharge gass such as Ne and Xe.

In front on the front glass substrate 3 of plate 2, dispose multiple row respectively by scan electrode 4 and keep the show electrode 6 and the secret note (light shield layer) 7 of a pair of band shape that electrode 5 constitutes in the mode that is parallel to each other.In front on the glass substrate 3, form dielectric layer 8, and be formed with the protective layer 9 that waits formation by magnesium oxide (MgO) on its surface as capacitor work in the mode that covers show electrode 6 and light shield layer 7.

In addition, overleaf on the back side glass substrate 11 of plate 10,, dispose the address electrode 12 of a plurality of band shapes in parallel to each other, cover these address electrodes with substrate dielectric layer 13 with the scan electrode 4 of front panel 2 and keep on the vertical direction of electrode 5.And, on the substrate dielectric layer 13 of 12 of address electrodes, be formed with the next door 14 of the specified altitude in dividing discharge space 16.In the groove that next door is 14, on each address electrode 12, be formed with the luminescent coating 15 that under action of ultraviolet ray, sends red light, blue light and green light respectively by applying in turn.At scan electrode 4 and keep the position that electrode 5 and address electrode 12 intersect and form arc chamber (discharge cell), the arc chamber of arranging on show electrode 6 directions with redness, blueness, green luminescent coating 15 becomes and is used for the colored pixel that shows.

Fig. 2 is the profile of front panel 2 of structure of dielectric layer 8 of the PDP of expression embodiments of the present invention.Fig. 2 shows in the mode that turns upside down with Fig. 1.As shown in Figure 2, waiting on the front glass substrate of making 3, be formed with by scan electrode 4 and keep show electrode 6 that electrode 5 constitutes and the pattern of secret note 7 by the method (float method) of floating.Scan electrode 4 and keep electrode 5 respectively by indium tin oxide (ITO) or tin oxide (SnO ₂) wait transparency electrode 4a, the 5a of formation and the metal bus electrode 4b that on

transparency electrode

4a, 5a, forms, 5b to constitute.Using the purpose of

metal bus electrode

4b, 5b is to provide conductivity on the length direction of

transparency electrode

4a, 5a, and

metal bus electrode

4b, 5b are formed by the conductive material that with silver (Ag) material is main component.

Dielectric layer 8 is configured to cover these

transparency electrodes

4a, 5a and

metal bus electrode

4b, 5b and the secret note 7 that forms on the front glass substrate 3, is formed with protective layer 9 on dielectric layer 8.

Next, the manufacture method to PDP describes.Form scan electrode 4 at first, in front on the glass substrate 3, keep electrode 5 and light shield layer 7.Transparency electrode 4a, the 5a that constitutes scan electrode 4 and keep electrode 5 and

metal bus electrode

4b, 5b utilize photoetching process etc. and pattern-making

formation.Transparency electrode

4a, 5a utilize formation such as thin-film technique, and

metal bus electrode

4b, 5b fire and harden the lotion that comprises silver (Ag) material with set point of temperature to obtain.In addition, light shield layer 7 too, be adopt to the lotion that comprises black pigment carry out the method for silk screen printing or on black pigment being formed on whole of glass substrate after, use photoetching process pattern-making and fire to form.

Next, to cover scan electrode 4, to keep the mode of electrode 5 and light shield layer 7, be coated with method coating dielectric cream such as (die-coating method) by mould on the glass substrate 3 in front and form dielectric cream layer (dielectric material layer).After coating dielectric cream, place official hour, thereby make the dielectric cream surface evening after the coating, become smooth surface.Then, by firing sclerosis dielectric cream layer, form the dielectric layer 8 that covers scan electrode 4, keeps electrode 5 and light shield layer 7.And dielectric cream is the coating that comprises dielectric substance, bonding agent and solvents such as glass powder.

Secondly, on dielectric layer 8, form the protective layer 9 that constitutes by magnesium oxide (MgO) by vacuum vapour deposition.By above-mentioned operation, form the formation thing (scan electrode 4, keep electrode 5, light shield layer 7, dielectric layer 8, protective layer 9) of regulation in front on the glass substrate 3, thereby finish front panel 2.

On the other hand, backplate 10 forms in the following manner.At first, on the glass substrate 11, adopt the method that the lotion that comprises silver (Ag) material is carried out silk screen printing overleaf, perhaps adopt after metal film being formed on whole, use photoetching process to form method of patterning etc., form material layer as the formation thing of address electrode 12 usefulness.Fire this material layer at a certain temperature, the calculated address electrode 12 thus.Next, on the back side glass substrate 11 that has formed address electrode 12, be coated with dielectric cream in the mode of overlay address electrode 12, form dielectric cream layer by mould Tu Fa etc.Then, form substrate dielectric layer 13 by firing dielectric cream layer.And dielectric cream is the coating that comprises dielectric substance, bonding agent and solvents such as glass powder.

Next, coating comprises the next door material at interior next door formation cream on substrate dielectric layer 13, with the pattern-making of regulation shape, forms the next door material layer thus, fires afterwards, thereby forms next door 14.At this, carry out the method for patterning (patterning) as next door with cream to coating on substrate dielectric layer 13, can be with photoetching process or sand-blast (sandblast).Secondly, be coated with the fluorophor cream that comprises fluorescent material on 14 the substrate dielectric layer 13 and on the side in next door 14,, form luminescent coating 15 thus by firing in adjacent next door.By above step, thereby finish the backplate 10 that has the component parts of regulation on the glass substrate 11 overleaf.

Like this, front panel 2 with component parts of regulation disposes in opposite directions with backplate 10, makes that scan electrode 4 and address electrode 12 are perpendicular, seals with glass dust around it, by in discharge space 16, enclosing the discharge gas that contains Ne, Xe etc., finish PDP1 thus.

Next, the dielectric layer 8 to front panel 2 is elaborated.As mentioned above, to dielectric layer 8 demanding proof voltages, also require to have high light transmission rate but then.This characteristic is to a great extent by about the forming of the glass ingredient that contains in the dielectric layer 8.

So far, as the method that forms such dielectric layer 8, known have a following method: adopt silk screen print method or mould Tu Fa etc. to apply lotion on the front glass substrate 3 that has formed show electrode 6, after the drying, under the temperature about 450 ℃～600 ℃, fire, described lotion is made of glass powder composition and bonding agent composition, and wherein the bonding agent composition is made of the solvent that comprises resin, plasticizer, dispersant etc.Also known this lotion is coated on the film (film), carries out drying, and be transferred on the front glass substrate 3 that is formed with show electrode 6 method of under the temperature about 450 ℃～600 ℃, firing.

So far, in order can to fire under the temperature about 450 ℃～600 ℃, it is lead oxide more than 20% that the glass ingredient that comprises in the dielectric layer 8 contains molar percentage.But consider environmental problem, disclose in recent years a kind of in glass oxygen-free lead, be about 5%～40% Bi and contain molar percentage ₂O ₃Example.

With respect to this, in the PDP of embodiments of the present invention, dielectric layer contains Bi ₂O ₃, containing CaO and BaO at least simultaneously, the content of representing with molar percentage of CaO is more than the content of representing with molar percentage of BaO.

In addition, above-mentioned glass material is characterised in that the content of representing with molar percentage of CaO is more than the content of representing with molar percentage of the BaO of the glass material of dielectric layer.And then above-mentioned glass material is characterised in that, contains K ₂O and more than one R ₂O (R is be selected from Li, Na at least a).And then, it is characterized in that the K that contains in the above-mentioned glass material ₂The content of representing with molar percentage of O is than the Li of above-mentioned glass material ₂O and Na ₂The summation of the content of representing with molar percentage of O wants many.And then, it is characterized in that the MoO that contains in the above-mentioned glass material ₃The content of representing with molar percentage be below 2%.And then, it is characterized in that the Bi that contains in the above-mentioned glass material ₂O ₃The content of representing with molar percentage be below 5%.

It is 0.5 μ m～3.0 μ m that the dielectric substance that utilizes wet type aeropulverizer (wet jet mill) or ball mill (ball mill) that these constituents are constituted is ground into average grain diameter, makes the dielectric substance powder.Then,, fully mix, make mould and be coated with the dielectric layer cream of using or printing usefulness with three-roll mill (three-roll mill) with this dielectric substance powder of 50 weight %～65 weight % and the bonding agent composition of 35 weight %～50 weight %.

The bonding agent composition is to contain the ethyl cellulose (ethyl-cellulose) of 1 weight %～20 weight % or the terpineol (terpinol) or the acetate of butyl carbitol (butylcarbitol acetate) of acrylic resin (acrylic resin).In addition, in lotion, can also add dioctyl phthalate, dibatyl phithalate, triphenyl phosphate, tributyl phosphate as required as plasticizer, interpolation improves printing as the glycerol monoleate (glycerop mono-oleate) of dispersant, Span-83 (sorbitan sesquio-leate), allylic phosphate of alkyl (alkyl-allyl based phosphate) etc.

Then,, be coated with method or silk screen print method by mould and be printed onto on the front glass substrate 3, and make its drying, then, under 575 ℃～590 ℃ of temperature higher slightly, fire than the softening point of dielectric substance in the mode that covers show electrode 6 with this dielectric layer cream.

And because the thickness of dielectric layer 8 is more little, the briliancy that improves PDP is remarkable more with the effect that reduces discharge voltage, therefore, preferably, as long as in the scope that dielectric voltage withstand does not descend, just set little thickness as far as possible.From the such condition and the angle of visible light transmissivity, in embodiment of the present invention, the thickness of dielectric layer 8 is set at below the 41 μ m.

In the PDP of embodiment of the present invention, have said structure by making dielectric layer 8, also high briliancy, high reliability can be guaranteed even high accuracy shows, and then the PDP of environmental problem can be realized considering.

Next, the constituent material to the dielectric layer 8 of the PDP of embodiment of the present invention is described in detail.

At first, to Bi ₂O ₃Content and R ₂The interpolation of O is narrated.In embodiment of the present invention, use Bi in the dielectric glass ₂O ₃Substitute material as lead composition.Bi in making dielectric glass ₂O ₃When content increases, can reduce the softening point of dielectric glass, various advantages are arranged on manufacturing process.But because the price height of Bi based material, institute is so that Bi ₂O ₃Content increase, the cost of raw material that also can cause using increases.

When reducing the content of Bi based material,, make firing temperature rise because the softening point of dielectric glass rises.If firing temperature rises, the diffusing capacity of the silver ion that diffuses out from the silver electrode that constitutes show electrode further increases.Therefore, it is more that the amount of the silver of colloidization also becomes, thereby cause that dielectric layer is painted or produce the phenomenon of bubble, produces the image quality decrease of PDP or produce the problem of the defective insulation of dielectric layer.

As the substitute material of Bi based material, be conceived to be selected from the alkali metal of Li, Na, K, Rb and Cs etc. among the present invention.If contain alkali-metal oxide, then can reduce the softening point of glass, thereby reduce the content of Bi based material, also reduce the softening point of glass, can bring various advantages to manufacturing process.

But, if contain alkali-metal oxide too much, will further promote the reduction of the silver ion that diffuses out from the silver electrode that constitutes show electrode, form more silver colloid, cause the painted of dielectric layer or produce the phenomenon of bubble.Consequently, the drawback of the defective insulation of the image quality decrease of generation PDP or generation dielectric layer.

In embodiment of the present invention, R ₂The content of representing with molar percentage of O is 1%～9%.By making content is more than 1%, can suppress xanthochromia, if but content surpasses 9%, and then the dielectric constant of dielectric layer changes significantly, produces unfavorable condition when display image.In addition, Bi ₂O ₃The content of representing with molar percentage also can ease down to 1%～5%.

And, in embodiment of the present invention, R ₂The R of O (R is be selected from Li, Na, K a kind of) contains two or more.This is based on following reason: contain a large amount of K in the front glass substrate 3 of general PDP ₂O and Na ₂O.If under the high temperature more than 550 ℃, fire dielectric layer 8, R then by containing in the dielectric glass ₂The Na that contains in O and the front glass substrate 3 ₂O causes alkali-metal ion (Li ⁺, Na ⁺, K ⁺) metathesis.

But, Li ⁺, Na ⁺And K ⁺Contribution to the thermal coefficient of expansion of front glass substrate 3 has nothing in common with each other separately.Therefore, in the firing of dielectric layer 8, caused under the situation of ion exchange, it is poor to produce near the thermal shrinking quantity of the part beyond in front the dielectric layer 8 of near thermal shrinking quantity the dielectric layer 8 of glass substrate 3 and front glass substrate 3, consequently exists on the front glass substrate 3 that has formed dielectric layer 8 and can produce the problem of big bending.

But as described in embodiments of the present invention, if R ₂O comprises two or more, even then cause above-mentioned metathesis, it is poor also to be difficult to produce on thermal shrinking quantity, thus the bending that can alleviate front glass substrate 3.Consequently can make the Bi that contains in the dielectric glass ₂O ₃The amount of representing with molar percentage be reduced to below 5%, and can alleviate the bending of front glass substrate 3.

Secondly, to R ₂Interpolation kind and the addition of O are elaborated.

As R ₂The oxide that O adds must contain K ₂O, and preferably contain Li ₂O or Na ₂Any of O or its both.Thus, even produce ion exchange, the thermal coefficient of expansion of front glass substrate 3 can bigger variation yet, and consequently, the front glass substrate 3 that can prevent to form dielectric layer 8 produces big bending.

Especially, by making the K that contains in the dielectric glass ₂The content of representing with molar percentage of O is than the Li that contains in the dielectric glass ₂O and Na ₂The total of the content of representing with molar percentage of O is many, can suppress the variation of the thermal coefficient of expansion of front glass substrate 3 reliably, can suppress front glass substrate 3 and produce bigger bending.

So, R ₂O can reduce the softening point of dielectric glass.On the other hand, R ₂The represented alkali-metal oxide of O promotes the reduction of the silver ion that diffuses out from the silver electrode that constitutes show electrode 6.Consequently form more silver colloid, cause the painted of dielectric layer 8 or produce the phenomenon of bubble, have the image quality decrease of PDP or produce the problem of the defective insulation of dielectric layer 8.

In order to suppress such based on R ₂The reduction of O in embodiments of the present invention, is added with CuO and CaO in dielectric glass.And, in order to suppress the formation of silver colloid, and added MoO ₃Below respectively separately action effect is described.

At first, the interpolation to CuO describes.CuO causes from CuO to Cu when firing dielectric layer 8 ₂The reduction of O.Consequently suppress silver ion (Ag ⁺) reduction, thereby can suppress the generation of xanthochromia.

But, make dielectric glass manifest blue effect owing to having distinguished that CuO has, and on the other hand, Cu ₂O has the effect that makes the dielectric glass shows green, and is so as described below, former thereby find out its improvement method by the generation of illustrating the colour developing effect.

In making the step of PDP, comprise that also assembling (assembly) step need repeatedly fire step.From CuO to Cu ₂Environmental condition around the reduction of O, the oxygen concentration when firing because of it etc. is affected easily, and also has the unmanageable character of its reducing degree.Consequently, when making PDP, carry out the reduction of CuO more and show blue part strongly and less carry out reduction and the part that shows green strongly is mixed in the PDP face, produce the dispersion on the colour developing degree, thereby briliancy, colourity produce inequality when the image of PDP shows, diminish visual display quality.

In order to suppress this painted dispersion that causes because of the reduction of CuO, in embodiment of the present invention, in dielectric glass, added CoO.CoO and CuO have equally makes dielectric glass manifest blue effect, but by adding CoO, can make dielectric glass more stably manifest blueness, thereby can improve the picture quality of PDP.

In addition, about its addition, if the total of the content of representing with molar percentage of CuO and CoO surpasses 0.3%, then the result is that dielectric glass excessively manifests blueness, can make the image quality decrease of PDP on the contrary.And under the situation of only adding CoO, not only can not suppress the reduction of the silver ion of foregoing description, but also can produce the disadvantage of the visible light transmissivity decline of dielectric layer 8.To this, as long as the adding up to below 0.3% of the content of representing with molar percentage of CuO and CoO, then describedly manifest blueness and be in optimum range, the picture quality of PDP also improves.

In addition, for its addition optimum value is arranged also.0.03%～0.3% the scope of being aggregated in of the content of representing with molar percentage of preferred CuO and CoO.Only contain 0.03%, though above-mentioned effect can occur, if the total of content surpasses 0.3%, then the result is that dielectric glass excessively manifests blueness, can make the image quality decrease of PDP on the contrary.And then under the situation of only having added CoO, not only can not suppress the reduction of the silver ion of foregoing description, but also can produce the disadvantage of the straight line transmitance decline of dielectric layer.To this, as long as make the adding up to below 0.3% of the content of representing with molar percentage of CuO and CoO, then describedly manifest blueness and be in optimum range, the picture quality of PDP also improves.

Secondly, the interpolation to CaO describes.As mentioned above, CaO suppresses silver ion (Ag ⁺) reduction and can suppress the generation of xanthochromia.The effect of CaO plays the effect as oxidant.But there is visible light transmissivity in the dielectric glass that contains CaO, especially helps the problem of straight line transmitance step-down of the fineness of display.Therefore, in embodiments of the present invention, the BaO with the effect that improves the straight line transmitance is added with the form that replaces a CaO displacement part.

But BaO also has promotion silver ion (Ag ⁺) reduction, and produce the drawback of xanthochromia.Therefore, the content of representing with molar percentage that makes the content of representing with molar percentage of BaO be less than CaO is important.Thus, xanthochromia can be do not produced, the straight line transmitance can be kept.

Next, to MoO ₃Interpolation describe.As mentioned above, in embodiments of the present invention, added MoO for the generation that suppresses silver colloid ₃Be known that by containing Bi ₂O ₃Dielectric glass in add MoO ₃, under the low temperature below 580 ℃, generate Ag easily ₂MoO ₄, Ag ₂Mo ₂O ₇, Ag ₂Mo ₄O ₁₃Etc. stable compound.

In embodiments of the present invention, because the firing temperature of dielectric layer 8 is 550 ℃～590 ℃, so be diffused into the silver ion (Ag in the dielectric layer 8 in firing ⁺) with dielectric layer 8 in MoO ₃React, generate stable compound and settle out.That is, because silver ion (Ag ⁺) be not reduced and settle out, so do not generate the silver colloid of aggegation.Therefore, the generation of oxygen also tails off owing to be accompanied by the generation of silver colloid, so the generation of the bubble in the dielectric layer 8 has also just tailed off.And, even replace MoO ₃And interpolation WO ₃Or CeO ₂Or MnO ₂Such composition also can access identical effect.

In addition, MoO ₃The content of representing with molar percentage be preferably more than 0.1%, below 2%.If contain more than 0.1%, then number of bubbles and xanthochromia degree take a turn for the better, if but become more than 2%, then when firing dielectric glass, dielectric glass causes crystallization easily, consequently dielectric glass gonorrhoeaization and becoming does not keep the transparency, and visible light transmissivity reduces, the image quality decrease of PDP.If below 2%, then be difficult to cause crystallization, the picture quality of PDP can not descend yet.

As mentioned above, the formation that the dielectric layer 8 of PDP by making embodiment of the present invention is formed for above-mentioned material, even at the last dielectric layer 8 that forms of

metal bus electrode

4b, 5b that constitutes by silver (Ag) material, also can suppress xanthochromia phenomenon and bubble produces, and can have high light transmission rate and dielectric glass be carried out painted uniformly, and then realize suppress the bending of front glass substrate.Consequently, can realize seldom producing the high PDP of bubble or xanthochromia and transmitance.

As the PDP in the embodiment of the present invention, as arc chamber in order to be suitable for the high definition TV of 42 inches levels, the height of having made the next door is that the interval (chamber spacing) in 0.15mm, next door is that the interelectrode distance of 0.15mm, show electrode is 0.06mm, to enclose the PDP of mist that the content of pressing 60kPa to enclose the Xe that discharge gas is arranged is the Ne-Xe system of 15 volume %.The embodiment that the material that has changed the dielectric layer among this PDP is formed describes.

(embodiment 1)

Table 1 expression constitutes the material of the dielectric glass of dielectric layer 8 and forms.

[table 1]

Dielectric glass is formed (molar percentage)

Embodiment 1

Embodiment 2

Comparative example 1

Comparative example 2

Comparative example 3

Comparative example 4

Comparative example 5

Comparative example 6

Comparative example 7

Comparative example 8

Comparative example 9

Bi ₂O ₃

3.0％?

CaO?

3.0％?

4.0％?

2.0％?

1.0％?

3.0％?

BaO?

1.0％?

-?

2.0％?

3.0％?

1.0％?

K ₂O?

5.0％?

7.0％?

5.0％?

-?

2.0％?

5.0％?

Na ₂O?

2.0％?

-?

2.0％?

4.0％?

2.0％?

Li ₂O?

-?

5.0％?

1.0％?

-?

CoO?

0.1％?

-?

0.2％?

0.1％?

0.2％?

-?

CuO?

0.1％?

0.2％?

0.3％?

0.2％?

-?

MoO ₃

0.7％?

2.5％?

0.7％?

Other

85.1％?

85.0％?

84.8％?

85.0％?

83.2％?

85.1％?

85.3％?

Made the PDP of the dielectric layer 8 that forms by these dielectric glass.In addition, the project of the composition of the material shown in the table 1 " other, material composition " is zinc oxide (ZnO), boron oxide (B ₂O ₃), silica (SiO ₂), aluminium oxide (Al ₂O ₃) wait the material that does not contain lead composition to form.The content that these materials are formed is not particularly limited, and is the content range of the material composition of prior art degree.

In order to estimate the characteristic of the PDP that constitutes by the dielectric glass shown in the table 1, estimate for following project.Its evaluation result is as shown in table 2.

[table 2]

At first use turbidity survey meter (Haze Meter) to measure the transmitance of front panel 2.About measuring, remove the transmitance of front glass substrate 3 and the influence that scan electrode 4 waits other inscape, be set as the transmitance of the reality of dielectric layer 8, using its straight line composition is that the straight line transmitance compares.And the straight line transmitance of the dielectric layer 8 among the PDP is preferred more than 70%, if be below 70%, then the briliancy of PDP reduces, and is not preferred.

In addition, measure the degree of the xanthochromia that causes by silver (Ag), measure the b of the yellow degree of expression with color meter (Minolta company in Konica make CR-300) ^*In addition, b ^*Value is 9 points of measuring in the PDP face, and compares by mean value and maximum.Its result is as shown in table 2 equally.And, the b that xanthochromia exerts an influence to the display performance of PDP ^*The standard of value is b ^*=3.This value is big more, and then xanthochromia is eye-catching more, descends as the PDP colour temperature, and is undesirable.

Secondly, in order to estimate dielectric degree of staining, (Minolta company in Konica makes: the transmitance of CM-3600) measuring front panel 2 with the spectral photometric colour measuring meter.About measuring, remove the transmitance of front glass substrate 3 and the influence that scan electrode 4 waits other inscape, be set as the transmitance of the reality of dielectric layer 8,, will deduct the value object as a comparison after the transmitance of 660nm from the transmitance of 550nm as the wavelength interdependence of transmitance.And the wavelength interdependence of the above-mentioned transmitance among the PDP is preferably below 2%.If be more than 2%, the luminous whiteness of panel reduces, so not preferred.

And then, in order to estimate the bending of the substrate that causes because of dielectric glass, measure the residual stress of substrate with polarisation deformation gauge (polariscope).The polarisation deformation gauge can be measured owing to the deformation reason based on glass ingredient is present in residual stress on the front glass substrate 3.The assay method of this residual stress is known in TOHKEMY 2004-067416 communique etc.If have compression stress on the front glass substrate 3, then the residual stress of Ce Dinging is for just (+) value, if having tensile stress on the front glass substrate 3, then the residual stress of Ce Dinging is worth for negative (-), and is as shown in table 2.And,, cause the intensity of dielectric layer 8 to reduce if the residual stress among the PDP can produce tensile stress for just (+) value on the contrary on dielectric layer 8.Residual stress among the therefore preferred PDP is negative (-) value.

Result in the his-and-hers watches 2 describes.Comparative example 1,7 and 8 is not owing to contain BaO respectively in table 1, and contains excessive MoO ₃, perhaps do not contain CuO, so straight line transmitance less than 70%.

Comparative example 2 contains BaO too much in table 1, though the straight line transmitance up to 82.7%, b ^*Value is also up to 5.6, so not preferred.

Comparative example 3 does not contain CoO in table 1, though b ^*The mean value of value is 2.6, is below 3.0, but maximum is 3.4, disperses greatly, so not preferred.

Comparative example 4 in table 1 CoO and CuO add up to 0.5%, a lot, very big so the value of transmitance wavelength interdependence is 3.1%, so not preferred.

Comparative example 5,6 does not contain K in table 1 ₂O, perhaps K ₂O is less than Na ₂O and Li ₂The total of O is so the value of residual stress is not preferred.

Comparative example 9 does not contain CoO and CuO in table 1, so b ^*It is big, also improper that value becomes.

To this, in the

embodiment

1,2 of the dielectric layer 8 of the PDP that constitutes embodiment of the present invention, it is suitable that the material of dielectric glass is formed, and the evaluation result of table 2 is all desirable.

And the inventor is in addition also to MoO ₃The interdependence of content measure.In view of the above, do not contain MoO ₃The PDP face in 9 b ^*The mean value of value is more than 4.0, to this, has confirmed to contain 0.1% MoO ₃, and other form the b of identical PDP ^*Value can be optimized to 2.0.In addition, MoO ₃Content until 0.7%, b ^*Value and number of bubbles all show good result, if but MoO ₃Content greater than 2%, then the dielectric layer of PDP can gonorrhoeaization, transmitance also obviously reduces.

As mentioned above, PDP according to the embodiment of the present invention can realize a kind of as dielectric layer 8 visible light straight line transmitance height, b ^*Value is best, and can suppress the PDP of not leaded (Pb) composition of the environmental protection of curved substrate.

(embodiment 2)

Next, to Bi ₂O ₃Content and R ₂The content of O especially describes the embodiment that goes through xanthochromia.

The material that constitutes the dielectric glass of dielectric layer 8 among the table 3 expression embodiment 2 is formed.In addition, expression has also been measured b with color meter (CR-300 that Ka Nika Minolta company makes) similarly to Example 1 in table 3 ^*The result of value.And, the b that xanthochromia exerts an influence to the display performance of PDP ^*The standard of value is 3.This value is big more, and then xanthochromia is eye-catching more, and as PDP, colour temperature reduces, and is not preferred.

[table 3]

?	Embodiment 1	Embodiment 2	Embodiment 3	Comparative example 1	Comparative example 2
						Bi ₂O ₃Dielectric is formed (mole %)	3.1％?	1.0％?	3.7％?	0％?	5.2％?
R ₂The O dielectric is formed (mole %)	8.6％?	7.8％?	4.0％?	9.3％?	0％?
						Xanthochromia (b* value) mean value	1.8?	2.7?	1.2?	5.1?	7.0?

In table 3, comparative example 1 does not contain Bi ₂O ₃, but contain more R ₂So O is b ^*Value is 5.1, and is very big, and comparative example 2 contains Bi ₂O ₃, but do not contain R ₂So O is b ^*Value is 7.0, and is very big.

To this, in

embodiment

1,2,3, by containing Bi according to the embodiment of the present invention ₂O ₃And R ₂The amount of O, evaluation result all obtain ideal results.And, for R ₂The lower limit of the content of O is studied, and has confirmed by containing the R more than 1% ₂O can reduce the softening point of dielectric glass, also can suppress the bending of substrate simultaneously.

As mentioned above, PDP according to the embodiment of the present invention can realize a kind of b ^*The PDP of not leaded (Pb) composition of value the best and environmental protection.

The industry utilizability

As mentioned above, PDP of the present invention has realized not having the xanthochromia of dielectric layer, and then the high PDP of the display quality of environmental protection, and is useful in big picture display device etc.

Claims

1. plasm display panel; front panel that has formed show electrode, dielectric layer and protective layer on the glass substrate and relative configuration of backplate that on substrate, has formed electrode, next door and luminescent coating; and seal on every side and form discharge space; described plasm display panel is characterised in that

Described dielectric layer contains Bi ₂O ₃And contain CaO and BaO at least, the content of representing with molar percentage of CaO is more than the content of representing with molar percentage of BaO,

Described dielectric layer also contains K ₂O, and contain from Na ₂O or Li ₂More than one that select among the O,

K ₂The content of representing with molar percentage of O compares from Li ₂O or Na ₂The total of the content of representing with molar percentage of more than one that select among the O is many,

Described dielectric layer also contains CoO and CuO, 0.03%～0.3% the scope of being aggregated in of the content of representing with molar percentage of CoO and CuO.

2. plasm display panel as claimed in claim 1 is characterized in that,

K ₂O and from Na ₂O or Li ₂The content of representing with molar percentage of more than one that select among the O add up to 1%～9%.

3. plasm display panel as claimed in claim 1 is characterized in that,

Bi ₂O ₃The content of representing with molar percentage be 1%～5%.

4. plasm display panel as claimed in claim 1 is characterized in that,

Described dielectric layer contains MoO ₃

5. plasm display panel as claimed in claim 4 is characterized in that,

MoO ₃The content of representing with molar percentage be 0.1%～2%.