CN1759072A - Non-lead glass, glass powder for covering electrodes and plasma display device - Google Patents

Abstract

A lead-free glass is disclosed which is essentially composed, in molar percentage, of 20-50% of B2O3, 5-35% of SiO2, 10-30% of ZnO, 0-10% of Al2O3, 0-10% of SrO, 6-16% of BaO, 2-16% of Li2O, 0-10% of Na2O + K2O, 0-9% of Bi2O3, and 0-2% of CuO + CeO2. The lead-free glass has a molar ratio (B2O3 + SiO2 + Al2O3)/(Bi2O3 + BaO) of not less than 3.25, and contains 8 mol% or less of MgO + CaO. A plasma display is also disclosed wherein a transparent electrode on a glass substrate constituting the front plate or an electrode on a glass substrate constituting the back plate is coated with the lead-free glass.

Description

Crown glass, the glass powder that is used for covering electrodes and plasma display system

Technical field

The present invention relates to be applicable to insulation-coated crown glass, the glass powder that is used for covering electrodes and the plasma display system (calling PDP in the following text) of transparency electrodes such as ITO (tin-doped indium oxide), stannic oxide.

Background technology

In recent years, the thin flat colour display device has caused concern.In such display unit,, form electrode in each pixel in order to control the show state of the pixel that forms image.As such electrode,, used the transparency electrode that on glass substrate, has formed ITO or SnO 2 thin film etc. in order to prevent the low of picture quality.

As the transparency electrode that forms at glass baseplate surface that the display surface of above-mentioned display unit uses, thin-line-shaped in order to realize that meticulous image is processed to.And, need guarantee the transparency electrode insulativity each other of such retrofit for independent each pixel of control.But,, have the situation of passing through a little electric current through the surface of this glass substrate to occur when the surface of glass substrate has under the situation that the existence of the composition of alkali is arranged in water existence or the glass substrate.For preventing such electric current, it is effective forming insulation layer between transparency electrode.In addition, in order to prevent to ask the low of picture quality that the insulation layer of formation causes in transparency electrode, this insulation layer is preferably transparent.

The insulating material of the insulation layer that known multiple formation is such, especially not only transparent, reliability but also high insulating glass material are adopted widely.

Recently among the PDP that extremely expects as large-scale planar color display device, be separated to form the unit, form image by making it that plasma discharge take place in these unit by the prebasal plate that is used as display surface, back of the body substrate and next door.Surface at above-mentioned prebasal plate has formed transparency electrode, for this transparency electrode of protection in plasma effect, must be covered to above-mentioned transparency electrode with the strong glass of article on plasma weather resistance.

The glass that is used for such covering electrodes makes normally that glass powder uses.For example, after in above-mentioned glass powder, adding weighting material etc. as required, mix with resin, solvent etc. again and form the glass thickener, then this glass thickener is applied on the glass substrate that has formed transparency electrode agglomerating method again:, again it is laminated on the glass substrate that has formed transparency electrode method such as back agglomerating method aforementioned transparency electrode is covered perhaps with above-mentioned glass powder and mixed with resin, mixed packing etc. and the slurry that obtains is made green sheet (green sheet) as required again.

For covering electrodes glass, except above-mentioned electrical insulating property, also require it to possess following characteristic, for example, softening temperature Ts is 450～650 ℃, 50～350 ℃ of interior average coefficient of linear expansion α of scope are 60 * 10 ^-7～90 * 10 ^-7/ ℃, the transparency height of the covering electrodes glass coating that sintering obtains, specific inductivity is low etc., has proposed various glass in the past.

Further, lead-free in recent years glass expected, for example, the Japanese Patent spy opens and discloses in the table 1 of 2002-249343 communique, represents the B by 34.0% with mass percent ₂O ₃, 4.4% SiO ₂, 49.9% ZnO, 3.9% BaO, 7.8% K ₂The covering electrodes glass that O forms.

Above-mentioned lead-free covering electrodes reaches 74% with the visible light transmissivity of the glass of having the ITO film that glass was covered.

In recent years, wishing to develop can be higher than this visible light transmissivity, specific inductivity can be lower crown glass and covering electrodes glass powder, and have by this crown glass or use kind electrode to be covered and carried out the PDP of the prebasal plate of covering electrodes with glass powder.

The purpose of this invention is to provide the crown glass that addresses this problem, covering electrodes with glass powder and PDP.

Summary of the invention

The invention provides crown glass (glass 1 of the present invention), is that the mole % of benchmark represents that described glass is in fact by 20～50% B in order to following oxide compound ₂O ₃, 5～35% SiO ₂, 10～30% ZnO, 0～10% Al ₂O ₃, 0～10% SrO, 6～16% BaO, 2～16% Li ₂The Na of O, O～10% ₂O+K ₂O, 0～9% Bi ₂O ₃, 0～2% CuO+CeO ₂Form (B ₂O ₃+ SiO ₂+ Al ₂O ₃)/(Bi ₂O ₃+ BaO) more than or equal to 3.25, contain under the situation of MgO or CaO MgO+CaO smaller or equal to 8 moles of %.

And, the invention provides crown glass (glass 2 of the present invention), be that the mole % of benchmark represents that described glass is in fact by 20～50% B in order to following oxide compound ₂O ₃, 5～35% SiO ₂, 10～30% ZnO, 0～10% Al ₂O ₃, the SrO of O～10%, 6～16% BaO, 2～16% Li ₂O, 0～10% Na ₂O+K ₂O, 0～2% CuO+CeO ₂Form, do not contain Bi ₂O ₃

In addition, the invention provides PDP (PDP of the present invention), it is to be separated to form unitary PDP by the prebasal plate that is used as display surface, back of the body substrate and next door, and the transparency electrode on the glass substrate of formation prebasal plate is covered by aforementioned crown glass.

In addition, the invention provides PDP (PDP2 of the present invention), be separated to form unitary PDP by the prebasal plate that is used as display surface, back of the body substrate and next door, the electrode that constitutes on the glass substrate of carrying on the back substrate is covered by aforementioned crown glass.

In addition, the invention provides the covering electrodes glass powder that the powder by aforementioned crown glass forms.

The best mode that carries out an invention

Crown glass of the present invention (calling glass of the present invention in the following text) is applicable to covering electrodes.Below just glass of the present invention is described as the situation of covering electrodes with glass applications, but the purposes of glass of the present invention is not limited thereto.In addition, glass of the present invention is made Powderedly usually under the situation about using with glass as covering electrodes, and this pulverous glass is covering electrodes glass powder of the present invention.

Glass of the present invention is made Powdered use usually.For example, glass powder of the present invention is made the glass thickener with organic vehicle (vehicle) of giving printing, coating above-mentioned glass thickener, sintering covering electrodes then on the electrode that is formed on the glass substrate.In addition, can adopt in the organic solvents such as tackiness agent such as ethyl cellulose and organic vehicle being dissolved in α-terpinol and the material that forms.In addition, also can use foregoing green sheet method covering electrodes.

For PDP, glass of the present invention is applicable to the lining of the transparency electrode of prebasal plate.PDP in this case is PDP of the present invention.In addition, glass of the present invention also can be used in the lining of the opaque electrode of PDP back of the body substrate.

In addition, glass of the present invention is applicable to the lining of the electrode, particularly silver electrode of PDP back of the body substrate.Also have, PDP in this case is PDP2 of the present invention.

Glass of the present invention is used under the situation of lining of electrode of PDP back of the body substrate, can uses the material that in glass powder of the present invention, has added heat resistant pigment and ceramic packing as required and formed as the covering electrodes material.

As heat resistant pigment, can exemplify composite oxide power, based on the black pigments such as composite oxide power of chromium, iron based on chromium, copper, and white pigment such as Titanium Dioxide (Rutile) Top grade powder, anatase-type titanium oxide powder.

As ceramic packing, can exemplify the adjustable SiO 2 powder of specific inductivity and coking property, alumina powder etc.

Also have, glass of the present invention is not limited to the prebasal plate of PDP or the covering electrodes of back of the body substrate, also is applicable to the lining of the electrode on other substrate, particularly transparency electrode and silver electrode.

Formed transparency electrode on the glass substrate of the prebasal plate of PDP of the present invention, the surface of this glass substrate is covered by glass of the present invention.

The thickness of glass substrate that is used for prebasal plate is generally 2.8mm, and this glass substrate itself is preferably 90% to the optical transmission rate of wavelength 550nm.In addition, its turbidity is preferably 0.4%.

Aforementioned transparency electrode for example is the band shape of wide 0.5mm, each zonal electrode formation parallel to each other.The distance of each strip electrode centreline space for example is 0.83～1.0mm, and in this case, the ratio that transparency electrode accounts for glass baseplate surface is 50～60%.

The prebasal plate of PDP of the present invention is for the optical transmission rate (T of 550nm ₅₅₀) be preferably more than 77%.T ₅₅₀Less than 77%, then image quality may be not good, and more preferably more than 79%, good especially is more than 80%.

In addition, its turbidity is more fortunately below 26%.Turbidity surpasses 26%, and then the image quality of PDP may be not good, more preferably below 20%.

PDP of the present invention is if exchange way is then made according to the methods below.

Form transparency electrode and the bus (being generally silver-colored line) that constitutes pattern at glass baseplate surface, be coated with glass powder of the present invention then thereon, form glass coating behind the sintering, form magnesium oxide layer as protective membrane at last and obtain prebasal plate.On the other hand, on the surface of an other glass substrate, form the address (address) that constitutes pattern and use electrode, be coated with glass powder of the present invention then thereon, form glass coating behind the sintering, then form the next door with strip thereon, republish, the sintering luminescent coating, make back of the body substrate.Forming aforementioned glass coating also can not use the glass thickener and use the green sheet method.

The edge of prebasal plate and back of the body substrate is coated with sealing material with divider (dispenser), and after the assembling of electrode subtend was used in aforesaid transparency electrode and address, sintering formed PDP.With the PDP exhaust gas inside, in discharge space (unit), enclose discharge gass such as Ne or He-Xe again.

Also have, top example is an exchange way, and the present invention also can be applicable to the PDP of direct current mode.

PDP2 of the present invention for example makes according to the methods below.That is, in the manufacture method of the PDP of the invention described above, the glass powder that is coated on transparency electrode and the bus is not limited to glass powder of the present invention, uses glass powder of the present invention to make and be coated on the address with the glass powder on the electrode.

The Ts of glass of the present invention is good with 450～650 ℃.Ts surpasses under 650 ℃ the situation, and normally used glass substrate (vitrification point: 550～620 ℃) may be out of shape when sintering.

Using vitrification point is that above-mentioned Ts is being good below 630 ℃, more preferably 580～600 ℃ under 610～630 ℃ the situation of glass substrate etc.

Using vitrification point is that above-mentioned Ts better is less than 580 ℃, and is not less than 530 ℃ under 550～560 ℃ the situation of glass substrate etc.

In addition, under the situation of the covering electrodes glass coating that is used for monolayer constructions will, above-mentioned Ts is being good more than 520 ℃, better more than 550 ℃.Using vitrification point is that Ts is best more than 580 ℃ under 610～630 ℃ the situation of glass substrate etc.

As aforementioned glass substrate, the normally used α of being is 80 * 10 ^-7～90 * 10 ^-7/ ℃ substrate.Therefore, for the expansion characteristics with this glass substrate coincide, prevent the bending of glass substrate and the decline of intensity, the α of glass of the present invention is with 60 * 10 ^-7～90 * 10 ^-7/ ℃ be good, more preferably 70 * 10 ^-7～85 * 10 ^-7/ ℃.

The Ts of glass of the present invention is preferably 450～650 ℃, and α is preferably 60 * 10 ^-7～90 * 10 ^-7/ ℃

The specific inductivity (ε) of glass of the present invention under 1MHz is being good below 9.5.ε surpasses under 9.5 the situation, and it is excessive the unitary electrostatic capacity of PDP to occur, the phenomenon that PDP current consumption increases, and ε is better below 9, preferably below 8.5.

Glass of the present invention 250 ℃ resistivity (ρ) 10 ⁹Ω cm is above to be good.ρ is less than 10 ⁹Under the situation of Ω cm, might cause defective insulation.

When glass of the present invention is used for the lining of silver electrode of PDP prebasal plate or PDP back of the body substrate, even preferably do not present silver hair look phenomenon or present silver hair look phenomenon also not obvious.So-called silver hair look phenomenon is exactly that the glass of lining has the silver diffusion under the situation of argentiferous bus electrode with the glass lining that forms on the transparency electrode of for example glass substrate of PDP prebasal plate, be colored as dark brown or yellow, the phenomenon of the image quality reduction of PDP.

Then, represent with molar percentage, describe with regard to the composition of glass of the present invention.

B ₂O ₃Being the component that makes stabilization, is necessary component.B ₂O ₃Be tending towards unstable less than 20% glass, content is being good more than 22%, wants to improve under the situation of Ts, reduction ε etc., better more than 25%.B ₂O ₃Words above 50% then Ts are tended towards superiority, and are being good below 45%, better below 40%.

SiO ₂Being the component that makes stabilization, is necessary component.In addition, SiO ₂Silver hair look phenomenon there is the inhibition effect.If SiO ₂Less than 5%, then glass is tending towards unstable, and weathering resistance is tending towards descending.If will improve Ts or T ₅₅₀Perhaps reduce under the situation of ε etc., then SiO ₂Be good more than 7%, better more than 10%, special good more than 13%.SiO ₂Surpass 35%, then Ts tends towards superiority, and is good below 29%, and is better below 25%, further is desirably below 24%.

ZnO is the component that Ts is reduced, and is necessary component.If ZnO is less than 10%, then Ts tends towards superiority, and is being good more than 15%, and is better more than 17%.If ZnO surpasses 30%, separate out crystallization, T in the time of then sintering may being occurred easily ₅₅₀Situation about descending is good below 29%, and is better below 28%, further is desirably below 25%.

Al ₂O ₃Be inessential component, work to make stabilization, can contain 10% at the most.If Al ₂O ₃Surpassing 10%, then be tending towards taking place devitrification, is good below 8%, better below 7%.Contain Al ₂O ₃Situation under, its content is being good more than 2%.

B ₂O ₃, SiO ₂And Al ₂O ₃Total content B ₂O ₃+ SiO ₂+ Al ₂O ₃Corresponding to glass of the present invention, particularly glass 1, is being good more than 46%.If this total content is less than 46%, then ε may become greatly, and is better more than 48%, best more than 49%.

SrO is inessential component, works to improve water tolerance, suppresses phase-splitting or improves ε, can contain 10% at the most.If SrO surpasses 10%, Ts then may occur and become too high or T ₅₅₀The situation that became low is good below 7%, and is better below 5%, special good below 4%.Want further to improve T ₅₅₀Deng situation under, content is below 3% or be good below 2%.

BaO has the phase-splitting of inhibition, increases α or improves T ₅₅₀Effect, be essential component.If BaO is less than 6%, then above-mentioned effect can diminish, and is good more than 7%, better more than 8%.If BaO surpasses 16%, then α becomes excessive on the contrary, is good below 14%.

Li ₂O has the Ts of reduction, increases α or improves T ₅₅₀Effect, be essential component.If Li ₂O is less than 2%, and then above-mentioned effect can diminish, and is good more than 2.5%, and is better more than 4%, better more than 5%.Li ₂If O surpasses 16%, then α becomes excessive.

General Li ₂O is 4～16%, and BaO is 5～14%.

Na ₂O and K ₂O is inessential component, and the effect that reduces Ts or increase α is arranged, and contains both or one simultaneously, and total content is at most 10%.If this total content surpasses 10%, then α can become excessive on the contrary.

Contain Na ₂Under the situation of O, its content is lower than 9% for good.If Na ₂O surpasses 9%, and T is arranged ₅₅₀The possibility that descends.Want further to improve T ₅₅₀Deng situation under, Na ₂O content is being good below 6%.

Contain K ₂Under the situation of O, its content is lower than 9% for good.If K ₂O surpasses 9%, then has the expansion characteristics with glass substrate to be difficult to coincide or T is arranged when being used for the prebasal plate of PDP ₅₅₀The possibility that descends.K ₂O content, is preferably in below 3% good especially below 4% better below 6%.

Li ₂O, Na ₂O and K ₂The total content Li of O ₂O+Na ₂O+K ₂O is being good below 16%.In addition, Li ₂O+Na ₂O+K ₂O is being good more than 4%, is more preferably more than 6% or more than 7%.

For glass 1, Bi ₂O ₃Be inessential component, the effect that reduces Ts is arranged, can contain 9% at the most.If Bi ₂O ₃Surpassing 9%, then the situation that ε uprises may occur, is good below 5%, better below 4%.Do not contain Bi ₂O ₃, or Bi ₂O ₃Content is good less than 1 mole of %.Also have, glass 2 does not contain Bi ₂O ₃

Mol ratio (B in the glass 1 ₂O ₃+ SiO ₂+ Al ₂O ₃)/(Bi ₂O ₃+ BaO) more than or equal to 3.25, be good more than or equal to 3.25 for 2 in glass.If this mol ratio is less than 3.25, then ε can become greatly, and this possibility is perhaps arranged, and is better more than or equal to 3.8.

CuO and CeO ₂All be inessential component, suppress under the situation of silver hair look phenomenon, can contain total at the most 2%.Under such situation, also can only contain wherein a kind ofly, it is good containing CuO, and both all have better.If CuO+CeO ₂Surpass 2%, then the painted of covering electrodes glass coating becomes significantly T ₅₅₀Descending, is good below 1.6%.Contain CuO and/or CeO ₂Situation under, CuO+CeO ₂Be good more than 0.2%, better more than 0.4%.CuO and CeO ₂Under the situation about all containing, content separately is good with 0.1～0.8%.

Contain under the situation of CuO, its content is being good more than 0.1%, and better more than 0.2%, good especially is more than 0.3%.

Contain CeO ₂Situation under, its content is being good more than 0.1%, better more than 0.2%, good especially is more than 0.4%.

For glass 1, further suppress under the situation of silver hair look phenomenon Bi ₂O ₃Be more than 1% and CuO+CeO ₂Be good more than 0.2%, Bi ₂O ₃Be more than 1.5% and CuO+CeO ₂Better more than 0.5%.

In this case, for example CuO contains 0.2% when above, ZnO, Na ₂O and K ₂The total content ZnO+Na of O ₂O+K ₂O is being good below 30%.If this total content surpasses 30%, then T ₅₅₀The possibility that decline is arranged is better below 26%.

Glass of the present invention is made of mentioned component in fact, and the composition that contains other in the scope that does not have influence on the object of the invention is also harmless.Contain under the situation of such composition, their total content is being good below 10%, better below 5%.

As other above-mentioned composition, can exemplify the TiO of the adjustment that is used for Ts or α, the stabilization of glass, the raising of chemical durability etc. ₂, ZrO ₂, La ₂O ₃, be used to halogenic ingredients such as F that reduce Ts etc.

Glass of the present invention does not contain PbO.

In addition, glass of the present invention is under the situation that contains MgO or CaO, and their total content below 8%, 8% below is being good corresponding to glass 2 corresponding to glass 1.If this total content surpasses 8%, then T ₅₅₀Can descend, or this possibility is arranged.To further improve T ₅₅₀The time, MgO+CaO is being good below 3%, better below 2%, it is good especially not contain MgO respectively for MgO and CaO.

For glass 1, under the situation that will suppress silver hair look phenomenon, SiO ₂More than 7%, Al ₂O ₃0～8%, SrO 0～5%, Li ₂O more than 2.5%, ZnO+Na ₂O+K ₂O below 30%, CuO more than 0.2%, contain under the situation of MgO or CaO MgO+CaO below 3% for good.Al ₂O ₃0～7%, Li ₂O more than 4%, ZnO+Na ₂O+K ₂O is better below 26%.In addition, BaO is better more than 7%.

The Ts of glass of the present invention to be controlled at more than 530 ℃ less than under 580 ℃ the situation, be preferably 23～38% B ₂O ₃, 6～23% SiO ₂, 21～28% ZnO, 4～6% Al ₂O ₃, 8～11% BaO, 10～15% Li ₂O and 0.5～6% Na ₂O+K ₂O, perhaps 8～15% Li ₂O and 2～6% Na ₂O+K ₂O.

Ts to be controlled at 580 above below 630 ℃ and will suppress to be preferably 29～39% B under the situation of silver hair look phenomenon ₂O ₃, 12～23% SiO ₂, 20～28% ZnO, 2～8% Al ₂O ₃, the BaO below 14%, the Li below 13% ₂O, 0～6%Na ₂O+K ₂O, 0.2 mole of CuO+CeO that % is above ₂

Embodiment

B in example 1～75 as the table ₂O ₃The hurdle is to CeO ₂The composition that the hurdle is represented with molar percentage, the allotment raw material also mixes, and with platinum alloy crucible fusion 1 hour, pulverizes with ball mill after being configured as laminal glass in 1200～1350 ℃ electric furnace, obtains glass powder.That in addition, B+Si+Al hurdle in table and BSiAl/BiBa hurdle are represented respectively is B ₂O ₃+ SiO ₂+ Al ₂O ₃Mole percent level and (B ₂O ₃+ SiO ₂+ Al ₂O ₃)/(Bi ₂O ₃+ BaO) mol ratio.

Example 1～23,31～75 is embodiment, and example 24～30 is a comparative example.

The softening temperature Ts of these glass powders (unit: ℃), crystallization peak temperature Tc (unit: ℃), aforementioned average coefficient of linear expansion α (unit: 10 ^-7/ ℃), aforementioned DIELECTRIC CONSTANT and aforementioned electricalresistivity (unit: Ω cm) record by following method.The result as shown in Table, undetermined is represented on empty hurdle.

Use the differential thermal analysis instrumentation fixed in the scope below Ts, Tc:800 ℃."-" in the Tc hurdle can't determine the crystallization peak value before being illustrated in and reaching 800 ℃.Also have, can determine before 800 ℃ has crystallization to separate out, the possibility that has transmissivity to improve by the crystallization peak value when sintering.

α: after the glass powder extrusion forming, will be processed as the cylindric of diameter 5mm, high 2cm, and measure 50～350 ℃ average coefficient of linear expansion with dilatometer at the sintered compact that the sintering temperature that is higher than Ts30 ℃ obtained in 10 minutes.

ε: glass powder is melted again, be configured as tabular after, be processed into the determination test material of 50mm * 50mm * thickness 3mm.The two sides of determination test material is made into the aluminium electrode by evaporation, and usefulness LCR instrumentation is decided the specific inductivity under the 1MHz.

ρ: use same determination test material, in 250 ℃ electric furnace, measure resistivity with mensuration ε.Denary logarithm with the ρ value of aforementioned unit representation in the table is represented.

In addition, the above-mentioned glass powder of 100g is mixed with the organic vehicle of 25g, make the glass thickener.Organic vehicle is made by the ethyl cellulose of dissolving 12% (mass percent is represented) in α-terpinol.

Then, prepare the glass substrate of big or small 50mm * 75mm, thick 2.8mm, the silver that screen painting is used in the part printing of the 48mm * 73mm of this glass baseplate surface is stuck with paste and sintering forms silver layer.The glass composition of above-mentioned glass substrate is expressed as 58% SiO with mass percent ₂, 7% Al ₂O ₃, 4% Na ₂O, 6.5% K ₂O, 2% MgO, 5% CaO, 7% SrO, 7.5% BaO, 3% ZrO ₂, and vitrification point is 626 ℃, α is 83 * 10 ^-7/ ℃.

Formed the glass substrate of silver layer more than the preparation and do not formed the glass substrate of silver layer, coated aforesaid glass thickener in the part of 50mm * 50mm equably by screen painting respectively, with 120 ℃ of dryings 10 minutes.These glass substrates are heated to Ts with 10 ℃/minute heat-up rate, keep 30 minutes sintering at Ts again.The thickness of the glass coating that forms on glass substrate after the operation is 30～35 μ m like this.

Do not form the optical transmission rate (unit: %) and turbidity (unit: of the wavelength 550nm of the test materials that forms above-mentioned glass coating on the glass substrate of silver layer %) according to following method mensuration.In addition, the having or not of silver hair look phenomenon that has formed the test materials of glass coating on the glass substrate that forms silver layer checked.It is as shown in the table for the result.

Transmittance: the optical transmission rate (not having the state of test materials to count 100%) of measuring wavelength 550nm with the recording spectrophotometer U-3500 (integration ball-type) of Hitachi's system.This transmissivity is being good more than 78%, better more than 81%.Also have, this transmittance values has all added 1%, with the light of wavelength 550nm to for overlayed on the PDP prebasal plate of transparency electrode when forming this glass coating transmissivity suitable.

Turbidity: the visibility meter (hazemeter) (using the illuminant-C of halogen ball) that uses ス ガ tester Co., Ltd. system.The light that the halogen ball sends becomes directional light through lens, incides test materials, measures total transmittance Tt and diffused transmission rate Td by integrating sphere, calculates turbidity by following formula.

Turbidity (%)=(Td/Tt) * 100

This turbidity is being good below 25%, and is better below 20%.Also have, this turbidity value has all added 1%, and so just the turbidity of the PDP prebasal plate when forming this glass coating for the lining transparency electrode is suitable.

The silver hair look: the silver hair look was suppressed when the color of glass coating was colourless, blueness or blue-greenish colour, was designated as zero: the color of glass coating silver hair look when yellow is remarkable, be designated as *.The result is shown in silver hair look A hurdle in the table.

In addition, in order to make silver hair look phenomenon more remarkable, the glass coating that obtains at the temperature sintering lower than Ts is estimated, and promptly Ts is that 590 ℃ of usefulness, Ts more than 600 ℃ are to be less than 550 ℃ of 580 ℃ usefulness more than 560 ℃ less than 600 ℃ 570 ℃ of usefulness, Ts more than 580 ℃.The result is shown in silver hair look B hurdle in the table.Also have, zero of mark zero and silver hair look A hurdle is identical in this hurdle; △ represents that the color of glass coating is faint yellow a, yellow-green colour etc., and the silver hair look is not so remarkable, carry out with Ts existing under the situation of sintering etc. the silver hair look repressed may; The color of mark * expression glass coating is significant yellow, and the silver hair look remarkable.

For example 76～101, Ts, α, ε calculate according to its composition.Its result is shown in table 1～13.

Table 1

Example	1	2	3	4	5	6	7	8
									B 2O 3	30.5	35.5	32.1	33.7	32. 9	29.6	38.6	32.3
SiO 2	20.2	15.2	18.2	19.1	18.7	24.6	16.4	18.3
									ZnO	25.4	25.4	21.4	22.5	22	19.7	19.3	21.5
Al 2O 3	4.1	4.1	4.3	4.5	4.4	3.9	3.9	4.3
									MgO	0	0	0	0	0	0	0	0
CaO	0	0	0	0	0	0	0	0
									SrO	0	0	0	0	0	0	0	0
BaO	12.3	12.3	13	8.7	13.4	12	11.7	13.1
									Li 2O	2.4	2.4	6.5	6.8	4.1	6	5.8	7.5
Na 2O	5.1	5.1	0	0	0	0	0	0
									K 2O	0	0	0	0	0	0	0	0
Bi 2O 3	0	0	3.2	3.4	3.3	3	2.9	1.6
									CuO	0	0	0.9	0.9	0.9	0.8	0.8	0.9
CeO 2	0	0	0.5	0.6	0.3	0.5	0.5	0.5
									B+Si+Al	54.8	54.8	54.5	57.2	56.0	58.1	58.9	54.9
BSiAl/BiBa	4.46	4.46	3.37	4.75	3.36	3.89	4.02	3.73
									Ts	605	600	590	590	605	610	605	600
Tc	-	-	-	-	-	-	-	-
									α	80	80	77	77	74	72	71	77
ε	8.4	8.1	9.3	9.3	8.6	9.1	8.4	8.8
									ρ	13.7	11.6.	11.2	10.5	11.8	11.1	11.2	10.6
Transmittance	82	81	81	82	82	81	81	81
									Turbidity	16	15	15	13	13	15	16	15
Silver hair look A	×	×	○	○	○	○	○	○
									Silver hair look B	×	×	○	○	○	○	○	○

Table 2

Example	9	10	11	12	13	14	15	16
									B 2O 3	32.3	32.2	38	41.6	36.1	29.1	33.3	32
SiO 2	18.3	18.2	13	15.7	20.4	16.5	18.9	18.1
									ZnO	21.5	21.5	21.6	18.5	12	29.1	22.2	21.4
Al 2O 3	4.3	4.3	4.3	3.7	4.8	3.9	4.5	4.3
									MgO	0	0	0	0	0	0	0	0
CaO	0	0	0	0	0	0	0	0
									SrO	0	0	0	0	0	0	0	4
BaO	13.1	13	13.1	11.2	14.6	11.8	9.8	9.4
									Li 2O	6.5	6.5	6	5.6	7.3	5.9	6.7	6.5
Na 2O	0	0	3.2	0	0	0	0	0
									K 2O	0	0	0	0	0	0	0	0
Bi 2O 3	3.2	3.2	0	2.8	3.6	2.9	3.3	3.2
									CuO	0.3	0.9	0.3	0.7	1	0.8	0.9	0.9
CeO 2	0.5	0.2	0.5	0.2	0.2	0.2	0.4	0.2
									B+Si+Al	54.8	54.7	55.3	61.0	61.3	49.4	56.7	54.5
BSiAl/BiBa	3.37	3.37	4.22	4.35	3.37	3.37	4.33	4.31
									Ts	590	590	600	610	605	585	607	600
Tc	-	-	-	-	-	-	-	-
									α	76	76	82	73	79	77	74	76
ε	9.3	9.2	8.6	8.4	9.0	9.5	8.7	9.2
									ρ	11.2	11.1	10.8	11.1	10.9	11.2		11.1
Transmittance	81	81	81	81	81	80	82	82
									Turbidity	14	15	19	16	16	16	13	13
Silver hair look A	○	○	○	○	○	○	○	○
									Silver hair look B	○	○	△	○	○	○	○	○

Table 3

Example	17	18	19	20	21	22	23	24
									B 2O 3	31.7	30.8	34.5	32.1	30.2	32.4	32.4	36.9
SiO 2	18	17.4	19.6	18.2	20.1	18.3	18.3	6.2
									ZnO	21.1	20.5	23	21.4	25.2	21.6	21.6	24.6
Al 2O 3	4.2	8.2	4.6	4.3	4	4.3	4.3	4.9
									MgO	0	0	0	0	0	0	5.4	0
CaO	0	0	0	0	0	5.4	0	0
									SrO	0	0	0	0	0	0	0	0
BaO	12.8	12.5	6.4	13	12.2	7.2	7.2	15
									Li 2O	4.9	6.2	7	2	2.3	6.5	6.5	7.4
Na 2O	3.2	0	0	0	5	0	0	0
									K 2O	0	0	0	4.3	0	0	0	0
Bi 2O 3	3.1	3.1	3.5	3.2	0	3.2	3.2	3.7
									CuO	0.8	0.8	0.9	0.9	1	0.9	0.9	1
CeO 2	0.2	0.5	0.6	0.5	0	0.2	0.2	0.2
									B+Si+Al	53.9	56.4	58.7	54.6	54.3	55.0	55.0	48.0
BSiAl/BiBa	3.39	3.63	5.98	3.37	4.45	5.30	5.30	2.57
									Ts	580	595	590	600	605	595	595	560
Tc	-	-	-	-	-	-	-	-
									α	84	73	76	84	80	70	73	85
ε	9.2	9.1	8.6	9.0	8.4	9.1	9.3	9.9
									ρ	11.2	11.0	10.2	12.5	13.5	10.9	10.6	11.8
Transmittance	81	80	80	80	79	79	79	78
									Turbidity	15	16	18	17	22	18	18	23
Silver hair look A	○	○	○	○	○	○	○	○
									Silver hair look B	○	○	○	○	○	○	○	△

Table 4

Example	25	26	27	28	29	30	31	32
									B 2O 3	30.1	30	44.7	29.5	23.2	31.8	37.6	37.6
SiO 2	17.1	12	9.9	20.7	23.2	18	12.9	12.9
									ZnO	20.1	42	24.9	24.9	23.2	21.2	21.5	21.5
Al 2O 3	4	0	4	3.9	4.6	4.2	4.3	4.3
									MgO	0	0	0	0	0	0	0	0
CaO	0	0	0	0	0	0	0	0
									SrO	0	0	0	0	0	0	0	0
BaO	12.2	0	6.6	10.9	14.1	10.5	13.1	13.1
									Li 2O	6.1	0	0	0	7	6.4	6.0	6.0
Na 2O	0	1	9.9	0	0	0	3.2	3.2
									K 2O	0	15	0	9.8	0	0	0	0
Bi 2O 3	9	0	0	0	3.5	6.4	0	0
									CuO	0.8	0	0	0.5	1	0.8	0.8	0.5
CeO 2	0.5	0	0	0	0.2	0.5	0.5	1.0
									B+Si+Al	51.2	42.0	58.6	54.2	51.0	54.1	54.8	54.8
BSiAl/BiBa	2.41	-	8.88	4.97	2.90	3.20	4.19	4.19
									Ts	560	565	600	615	575	580		587
Tc	-	672	-	-	-	-	-	-
									α	85	93	79	88	85	77	83	83
ε	11.5	8.3	8.3	8.0	10.0	10.1	8.4	8.4
									ρ	11.5	8.7		10.7		11.2	10.8	10.8
Transmittance	72		70	74	79	79	80	81
									Turbidity	31		30	25	17	23	23	19
Silver hair look A	○		×	×	○	○
									Silver hair look B	○		×	×	○	○	○	△

Table 5

Example	33	34	35	36	37	38	39	40
									B 2O 3	37.8	37.8	37.9	30.8	37.7	43.0	34.9	33.8
SiO 2	13.0	12.9	13.0	20.0	12.9	13.0	19.8	19.2
									ZnO	21.6	21.6	21.7	24.6	26.9	21.6	23.3	22.6
Al 2O 3	4.3	4.3	4.3	4.3	4.3	4.3	4.7	4.5
									MgO	0	0	0	0	0	0	0	0
CaO	0	0	0	0	0	0	0	0
									SrO	0	0	0	0	0	0	0	0
BaO	13.1	13.1	13.1	13.1	13.1	13.1	9.0	8.7
									Li 2O	6.0	9.2	6.0	6.0	4.0	4.0	7.0	10.0
Na 2O	3.2	0	0	0	0	0	0	0
									K 2O	0	0	3.2	0	0	0	0	0
Bi 2O 3	0	0	0	0	0	0	0	0
									CuO	0.5	0.5	0.5	0.5	0.5	0.5	0.7	0.7
CeO 2	0.3	0.5	0.3	0.5	0.5	0.5	0.5	0.5
									B+Si+Al	55.1	55.0	55.2	55.2	54.9	60.2	59.4	57.5
BSiAl/BiBa	4.19	4.19	4.19	4.20	4.19	4.59	6.59	6.59
									Ts	588	595	592	615	623	640	617	601
Tc	-	-	-	-	-	-	-	-
									α	83	75	82	75	71	68	69	72
ε	8.3	8.2	8.2	8.4	8.2	7.7	7.9	8.1
									ρ	10.8	10.1	11.3	10.9	11.8	11.8	10.0	9.3
Transmittance	81	81	78	80	80	82	80	81
									Turbidity	21	23	21	21	21	21	19	20
Silver hair look A
									Silver hair look B	△	△	△	○	△	×	○	○

Table 6

Example	41	42	43	44	45	46	47	48
									B 2O 3	34.1	31.8	32.4	32.3	32.2	33.9	30.9	31.9
SiO 2	19.3	19.7	18.3	18.3	18.2	19.2	19.2	19.8
									ZnO	22.8	23.3	21.6	21.5	21.5	22.6	22.6	23.3
Al 2O 3	4.5	4.6	4.3	4.3	4.3	4.5	4.5	4.7
									MgO	0	0	0	0	0	0	0	0
CaO	0	0	0	0	0	0	0	0
									SrO	0	0	0	0	0	0	0	0
BaO	11.1	9.0	13.1	13.1	13.0	8.7	8.7	9.0
									Li 2O	6.9	10.3	6.5	6.5	6.5	10.1	10.1	10.4
Na 2O	0	0	0	0	0	0	3.0	0
									K 2O	0	0	0	0	0	0	0	0
Bi 2O 3	0	0	3.2	3.2	3.2	0	0	0
									CuO	0.7	0.7	0	0.3	0.5	0.4	0.4	0.4
CeO 2	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5
									B+Si+Al	58.0	56.1	55.0	54.8	54.7	57.6	54.6	56.3
BSiAl/BiBa	5.20	6.25	3.36	3.36	3.36	6.59	6.25	6.25
									Ts	616	597	589	590	593	603	573	595
Tc	-	-	-	-	-	-	-	-
									α	72	76	79	79	79	74	86	79
ε	8.1	8.3			9.4	7.4	7.7	8.3
									ρ	10.4	10.2	11.1	12.1	11.2	9.3	9.5	9.2
Transmittance	80	80	83	83	83	82	79	82
									Turbidity	19	12	11	13	11	18	25	16
Silver hair look A
									Silver hair look B	○	○	○	○	○	○	○	○

Table 7

Example	49	50	51	52	53	54	55	56
									B 2O 3	32.1	32.0	31.9	33.2	32.2	31.8	30.9	31.8
SiO 2	18.2	19.9	19.8	19.4	20.0	19.8	20.3	19.8
									ZnO	21.4	23.5	23.3	22.9	23.6	23.3	24.0	23.3
Al 2O 3	4.3	4.7	4.7	4.6	4.7	4.7	4.8	4.7
									MgO	0	0	0	0	0	0	0	0
CaO	0	0	0	0	0	0	0	0
									SrO	0	0	0	0	0	0	0	0
BaO	13.0	9.1	9.0	8.8	8.1	9.0	9.3	9.0
									Li 2O	6.5	10.4	9.3	10.2	10.5	10.4	9.6	9.3
Na 2O	0	0	1.0	0	0	0	0	0
									K 2O	0	0	0	0	0	0	0	1.0
Bi 2O 3	3.2	0	0	0	0	0	0	0
									CuO	0.7	0	0.4	0.4	0.5	0.5	0.5	0.5
CeO 2	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5
									B+Si+Al	54.6	56.6	56.3	57.2	56.9	56.3	56.1	56.3
BSiAl/BiBa	3.36	6.25	6.25	6.48	7.05	6.25	6.05	6.25
									Ts	593	599	593	599	595	597	599	593
Tc	-	-	-	-	-	-	-	-
									α	77	75	77	75	76	76	75	76
ε	9.3	8.3	8.2	8.1	7.8	8.2	8.0	8.6
									ρ	11.2	10.0	9.5	9.7	10.1	10.1	9.7	10.3
Transmittance	81	83	82	83	82	81	82	81
									Turbidity	13	17	19	19	21	19	17	21
Silver hair look A
									Silver hair look B	○	△	○	○	○	○	○	○

Table 8

Example	57	58	59	60	61	62	63	64
									B 2O 3	30.7	32.5	31.8	31.1	31.1	31.0	30.9	31.6
SiO 2	20.4	20.2	19.8	20.5	20.5	20.4	20.3	20.8
									ZnO	24.1	23.8	23.3	24.1	24.1	24.1	23.9	24.5
Al 2O 3	4.8	4.8	4.7	4.8	4.8	4.8	4.8	4.9
									MgO	0	0	0	0	0	0	0	0
CaO	0	0	0	0	0	0	0	0
									SrO	0	0	0	0	0	0	0	0
BaO	9.3	9.2	9.0	9.3	9.3	9.3	9.2	9.5
									Li 2O	9.6	8.5	8.3	9.7	9.7	9.6	9.6	7.6
Na 2O	0	0	1.0	0	0	0	0	0
									K 2O	0	0	1.0	0	0	0	0	0
Bi 2O 3	0	0	0	0	0	0	0	0
									CuO	0.5	0.5	0.5	0.5	0.0	0.3	0.7	0.5
CeO 2	0.5	0.5	0.5	0.0	0.5	0.5	0.5	0.5
									B+Si+Al	55.9	57.5	56.3	56.4	56.4	56.2	56.0	57.3
BSiAl/BiBa	6.02	6.25	6.25	6.05	6.05	6.05	6.05	6.05
									Ts	596	608	590	601	600	602	601	615
Tc	-	-	-	-	-	-	-	-
									α	73	73	77	77	73	76	76	70
ε	8.3	8.1	8.2	8.1	8.3	8.2	8.2	8.1
									ρ	10.5	10.5	10.9	10.3	10.3	10.3	11.1	10.8
Transmittance	81	82	81	81	82	82	81	81
									Turbidity	18	19	21	18	19	16	17	19
Silver hair look A
									Silver hair look B	○	○	○	○	△	○	○	○

Table 9

Example	65	66	67	68	69	70	71	72
									B 2O 3	30.3	31.6	30.3	30.3	31.6	31.6	30.3	30.3
SiO 2	19.9	20.8	19.9	19.9	20.8	20.8	19.9	22.0
									ZnO	23.5	24.5	23.5	23.5	24.5	22.3	25.6	23.5
Al 2O 3	4.7	4.9	4.7	6.8	2.7	4.9	4.7	4.7
									MgO	0	0	0	0	0	0	0	0
CaO	0	0	0	0	0	0	0	0
									SrO	0	0	0	0	0	0	0	0
BaO	9.1	7.3	11.2	9.1	9.5	9.5	9.1	9.1
									Li 2O	11.5	9.8	9.4	9.4	9.8	9.8	9.4	9.4
Na 2O	0	0	0	0	0	0	0	0
									K 2O	0	0	0	0	0	0	0	0
Bi 2O 3	0	0	0	0	0	0.	0	0
									CuO	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5
CeO 2	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5
									B+Si+Al	54.9	57.3	54.9	57.0	55.1	57.3	54.9	57.0
BSiAl/BiBa	6.05	7.85	4.91	6.28	5.82	6.05	6.05	6.29
									Ts	585	590	598	602	598	604	599	605
Tc	-	-	-	-	-	-	-	-
									α	77	70	78	71	76	74	74	72
ε	8.4	8.1	8.4	8.1	8.3	8.1	8.3	8.2
									ρ	9.7	10.1	10.5	10.3	10.5	10.1	10.3	10.3
Transmittance	81	79	82	82	81	82	81	82
									Turbidity	21	22	17	18	18	16	20	16
Silver hair look A
									Silver hair look B	○	○	○	○	○	○	○	○

Table 10

Example	73	74	75	76	77	78	79	80
									B 2O 3	31.6	29.4	32.4	30.3	30.3	30.3	30.3	30.3
SiO 2	18.6	20.8	19.9	19.9	19.9	19.9	19.9	19.9
									ZnO	24.5	24.5	23.5	23.5	23.5	23.5	23.5	23.5
Al 2O 3	4.9	4.9	4.7	4.7	4.7	4.7	4.7	4.7
									MgO	0	0	0	0	0	2.1	0	0
CaO	0	0	0	0	2.1	0	0	0
									SrO	0	0	0	2.1	0	0	0	0
BaO	9.5	9.5	9.1	9.1	9.1	9.1	9.1	9.1
									Li 2O	9.8	9.8	9.4	9.4	9.4	9.4	9.4	9.4
Na 2O	0	0	0	0	0	0	0	2.1
									K 2O	0	0	0	0	0	0	2.1	0
Bi 2O 3	0	0	0	0	0	0	0	0
									CuO	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5
CeO 2	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5
									B+Si+Al	55.1	55.1	57.0	54.9	54.9	54.9	54.9	54.9
BSiAl/BiBa	5.83	5.82	6.28	6.05	6.05	6.05	6.05	6.05
									Ts	595	596	603	596	596	595	587	584
Tc	-	-	-
									α	73	76	70	77	75	76	81	80
ε	8.0	7.8	8.5	8.2	8.2	8.3	8.2	8.2
									ρ	10.3	10.3	10.3
Transmittance	82	81	81
									Turbidity	18	19	18
Silver hair look A
									Silver hair look B	○	○	○

Table 11

Example	81	82	83	84	85	86	87	88
									B 2O 3	37.3	35.1	33.2	23.3	27.5	31.2	30.6	30.0
SiO 2	6.1	11.4	16.2	22.2	21.0	19.4	19.0	18.6
									ZnO	27.3	25.8	24.4	26.2	24.8	22.9	22.4	22.0
Al 2O 3	5.4	5.1	4.9	5.2	4.9	4.6	4.5	4.4
									MgO	0	0	0	0	0	0	0	0
CaO	0	0	0	0	0	0	0	0
									SrO	0	0	0	0	0	0	0	0
BaO	10.5	9.9	9.4	10.1	9.6	8.8	8.6	8.5
									Li 2O	10.9	10.3	9.7	10.5	9.9	11.2	12.9	14.6
Na 2O	1.2	1.1	1.1	1.2	1.1	1.0	1.O	1.0
									K 2O	0	0	0	0	0	0	0	0
Bl 2O 3	0	0	0	O	0	0	0	0
									CuO	0.6	0.6	O.5	0.6	0.6	0.5	0.5	0.5
CeO 2	0.6	0.6	0.5	0.6	0.6	0.5	0.5	0.5
									B+Si+Al	48.8	51.7	54.3	50.8	53.5	55.1	54.0	53.0
BSlAl/BiBa	4.63	5.20	5.78	5.02	5.59	6.25	6.25	6.25
									Ts	553	569	583	576	584	581	569	558
Tc
									α	84	81	78	82	79	80	84	88
ε	8.5	8.3	8.2	8.6	8.4	8.2	8.3	8.5
									ρ
Transmittance
									Turbidity
Silver hair look A
									Silver hair look B

Table 12

Example	89	90	91	92	93	94	95	96
									B 2O 3	31.2	30.6	31.2	30.6	28.8	27.9	32.5	51.9
SiO 2	19.4	19.0	19.4	19.0	17.3	16.7	20.2	4.7
									ZnO	22.9	22.4	22.9	22.4	26.0	25.1	23.8	21.2
Al 2O 3	4.6	4.5	4.6	4.5	5.2	5.0	4.8	4.2
									MgO	0	0	0	0	0	0	0	0
CaO	0	0	0	0	0	0	0	0
									SrO	0	0	0	0	0	0	0	0
BaO	8.8	8.6	8.8	8.6	10.0	9.7	9.2	9.4
									Li 2O	9.1	9.0	9.1	9.0	10.4	13.4	8.5	7.5
Na 2O	3.0	5.0	1.0	1.0	1.2	1.1	0	0
									K 2O	0	0	2.0	4.0	0	0	0	0
Bi 2O 3	0	0	0	0	0	0	0	0
									CuO	0.5	0.5	0.5	0.5	0.6	0.6	0.5	0.5
CeO 2	0.5	0.5	0.5	0.5	0.6	0.6	0.5	0.5
									B+Si+Al	55.1	54.0	55.1	54.0	51.3	49.6	57.4	60.8
BSiAl/BiBa	6.25	6.25	6.25	6.25	5.12	5.12	6.24	6.45
									Ts	580	568	583	573	573	554	606	604
Tc
									α	82	88	83	89	81	88	71	69
ε	8.2	8.2	8.1	8.2	8.5	8.7	8.0	7.4
									ρ
Transmittance
									Turbidity
Silver hair look A
									Silver hair look B

Table 13

Example	97	98	99	100	101
						B 2O 3	47.2	45.0	32.5	31.8	40.4
SiO 2	9.4	10.0	20.2	19.8	11.5
						ZnO	21.2	22.5	23.8	23.3	26.0
Al 2O 3	4.2	4.5	4.8	4.7	5.2
						MgO	0	0	0	4.1	0
CaO	0	0	0	0	0
						SrO	0	0	0	0	0
BaO	9.4	10.0	9.2	9.0	10.0
						Li 2O	7.5	7.0	4.2	6.2	5.8
Na 2O	0	0	4.2	0	0
						K 2O	0	0	0	0	0
Bi 2O 3	0	0	0	0	0
						CuO	0.5	0.5	0.5	0.5	0.6
CeO 2	0.5	0.5	0.5	0.5	0.6
						B+Si+Al	60.8	59.5	57.4	56.3	57.1
BSiAl/BiBa	6.45	5.95	6.24	6.25	5.70
						Ts	608	608	604	613	610
Tc
						α	69	69	75	70	67
ε	7.5	7.6	7.9	83.1	7.8
						ρ
Transmittance
						Turbidity
Silver hair look A
						Silver hair look B

The possibility of utilizing on the industry

Can obtain that dielectric constant is little, can obtain crown glass and the covering electrodes glass powder of high-transmission rate during the covering electrodes glassy layer that is used for the PDP prebasal plate by the present invention.

The coating silver hair look phenomenon that can be obtained namely to be used in silver electrode by one of the present invention is also not obvious, crown glass and the covering electrodes glass powder of this phenomenon even do not occur.

Can obtain not contain Bi by one of the present invention₂O ₃Perhaps Bi₂O ₃Content is less than 1 % by mole above-mentioned crown glass and covering electrodes glass powder.

In addition, the covering electrodes glassy layer that may obtain prebasal plate is neither leaded, and power consumption is few again, and image quality is good PDP again. Further might be obtained not only not leadedly by one of the present invention, also not contain Bi₂O ₃PDP.

In addition, the covering electrodes glassy layer of back of the body substrate is not leaded, and particularly this electrode is in the situation of silver electrode, can suppress silver hair look phenomenon. Further can prevent situation about descending because of insulating properties that the reaction between this glassy layer and the silver electrode suppresses to cause.

Claims (15)

1. crown glass is characterized in that, is that the mole % of benchmark represents that described glass is in fact by 20～50% B in order to following oxide compound ₂O ₃, 5～35% SiO ₂, 10～30% ZnO, 0～10% Al ₂O ₃, 0～10% SrO, 6～16% BaO, 2～16% Li ₂O, 0～10% Na ₂O+K ₂O, 0～9% Bi ₂O ₃, 0～2% CuO+CeO ₂Form (B ₂O ₃+ SiO ₂+ Al ₂O ₃)/(Bi ₂O ₃+ BaO) more than or equal to 3.25, contain under the situation of MgO or CaO MgO+CaO smaller or equal to 8 moles of %.

2. crown glass as claimed in claim 1, its feature also is, B ₂O ₃+ SiO ₂+ Al ₂O ₃More than or equal to 46%.

3. crown glass as claimed in claim 1 or 2, its feature are that also % represents SiO with mole ₂More than or equal to 7%; Al ₂O ₃Be 0～8%; SrO is 0～5%; Li ₂O is more than or equal to 2.5%; ZnO+Na ₂O+K ₂O is smaller or equal to 30%; CuO is more than or equal to 0.2%; Contain under the situation of MgO or CaO MgO+CaO smaller or equal to 3%.

4. as each described crown glass in the claim 1～3, its feature also is, Li ₂O+Na ₂O+K ₂O is smaller or equal to 16%.

5. as each described crown glass in the claim 1～4, its feature also is, does not contain Bi ₂O ₃Perhaps Bi ₂O ₃Content is less than 1 mole of %.

6. as each described crown glass in the claim 1～4, its feature also is, Bi ₂O ₃More than or equal to 1%; CuO+CeO ₂More than or equal to 0.2%.

7. crown glass is characterized in that, is that the mole % of benchmark represents that described glass is in fact by 20～50% B in order to following oxide compound ₂O ₃, 5～35% SiO ₂, 10～30% ZnO, 0～10% Al ₂O ₃, 0～10% SrO, 6～16% BaO, 2～16% Li ₂O, 0～10% Na ₂O+K ₂O, 0～2% CuO+CeO ₂Form, do not contain Bi ₂O ₃

8. crown glass as claimed in claim 7, its feature also is, CuO+CeO ₂More than or equal to 0.2%.

9. as each described crown glass in the claim 1～8, its feature is that also % represents B with mole ₂O ₃Be 23～38%; SiO ₂Be 6～23%; ZnO is 21～28%; Al ₂O ₃Be 4～6%; BaO is 8～11%; Li ₂O is 10～15% and Na ₂O+K ₂O is 0.5～6%, perhaps Li ₂O is 8～15% and Na ₂O+K ₂O is 2～6%.

10. as each described crown glass in the claim 1～7, its feature is that also % represents B with mole ₂O ₃Be 29～39%; SiO ₂Be 12～23%; ZnO is 20～28%; Al ₂O ₃Be 2～8%; BaO is smaller or equal to 14%; Li ₂O is smaller or equal to 13%; Na ₂O+K ₂O is 0～6%; CuO+CeO ₂More than or equal to 0.2%.

11. as each described crown glass in the claim 1～10, its feature is that also softening temperature is 450～650 ℃; Average coefficient of linear expansion in 50～350 ℃ of scopes is 60 * 10 ^-7～90 * 10 ^-7/ ℃.

12. as each described crown glass in the claim 1～11, its feature is that also the specific inductivity under the 1MHz is smaller or equal to 9.5.

13. plasma display system, it is to be separated to form unitary plasma display system by the prebasal plate that is used as display surface, back of the body substrate and next door, it is characterized in that the transparency electrode on the glass substrate of formation prebasal plate is by each described crown glass lining in the claim 1～12.

14. plasma display system, it is to be separated to form unitary plasma display system by the prebasal plate that is used as display surface, back of the body substrate and next door, it is characterized in that the electrode that constitutes on the glass substrate of carrying on the back substrate is covered by each described crown glass in the claim 1～12.

15. the covering electrodes glass powder is characterized in that, is formed by the powder of each described crown glass in the claim 1～12.