CN101620967A - Transparent dielectric paste and plasma display screen applying same - Google Patents
Transparent dielectric paste and plasma display screen applying same Download PDFInfo
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- CN101620967A CN101620967A CN200810115934A CN200810115934A CN101620967A CN 101620967 A CN101620967 A CN 101620967A CN 200810115934 A CN200810115934 A CN 200810115934A CN 200810115934 A CN200810115934 A CN 200810115934A CN 101620967 A CN101620967 A CN 101620967A
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- glass powder
- transparent dielectric
- powder
- glass
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Abstract
The invention provides a transparent dielectric paste, which comprises glass powder and an organic carrier, wherein the glass powder is formed by combining monodisperse glass powder with different particle size distribution. In one embodiment of the invention, the glass powder is formed by combining inorganic powder (powder I) of which D90=3-10 mu m and inorganic powder (powder II) of which D90=200-800nm. The invention also provides a plasma display screen applying the paste, and a transparent dielectric layer of a front substrate of the obtained plasma display screen can improve transmittance and breakdown voltage resistance.
Description
Technical field
The present invention relates to plasma display panel (PDP), relate in particular to the slurry of the transparent medium that is used to form plasma display panel (PDP) and form the method for this transparent medium.
Background technology
Plasma display panel (PDP) can obtain very excellent picture under the strong environment of illumination, the light around needn't closing just can demonstrate distinct image.Therefore, plasma display panel (PDP) is fit to the needs of video conference and other displaying very much.Another characteristics of plasma display panel (PDP) are that the visual angle on its level and the vertical direction can both reach 160 degree, also can cover all at one glance to its picture even be sitting in a more inclined to one side position.Compare with TV with the computer monitor of same screen size, the weight of plasma television also is the lightest.Its thickness has only 9cm, and it can be suspended on the wall, is installed on the ceiling or is placed on the desk, and be not subjected to the interference in magnetic field.Plasma television is very convenient to use, almost is plug and play, can receive data and vision signal
Plasma display panel (PDP) is formed by prebasal plate 1, metacoxal plate 7 sealing-ins.Prebasal plate is made one group of show electrode 2 parallel and that partnered by X and Y with transparency conducting layer; for reducing the resistance of transparency electrode 2; make layer of metal electrode (as Ag electrode, Cr-Cu-Cr electrode) thereon again; claim bus electrode 3 again, on bus electrode 3, cover transparent dielectric layer 4 and MgO protective layer 5 again.Make one group of parallel addressing electrode 8 on the metacoxal plate earlier, cover one deck white dielectric layer 6 on it, make the usefulness of reflection.Form barrier 10 on white dielectric layer 6, barrier can be a strip, also can be clathrate, highly about 100 μ m.Barrier both done between the two substrates every son, prevent again the light string and the electricity string usefulness.On the surface of barrier 10 and white dielectric layer, cover red, green, blue three primary colors fluorescent powder 9 respectively successively.Three primary colors fluorescent powder is respectively red R: (Y, Ga) BO
3: Eu, green G:Zn
2SiO
4: Mn, blue B:BaMgAl
14O
23: Eu
2+
The main effect that is positioned at the transparent dielectric layer of prebasal plate is protection transparency electrode and bus electrode, savings electric charge and restriction discharging current.Keep normal discharge condition, promptly require thin and its proof voltage intensity of transparent dielectric layer to want high.Therefore, people always wish that transparent dielectric layer has good insulation performance and higher withstand voltage.If the dielectric layer insulation property are poor, will cause dielectric breakdown, and then make the electrode broken string; The visible light that the vacuum-ultraviolet light excitated fluorescent powder that gas discharge produced is on the other hand produced need pass through transparent dielectric layer, thereby, for just requiring the transmitance of dielectric layer, the brightness that improves display screen wants high.
In the manufacturing process of dielectric layer, generally by with the dielectric paste printing or be coated on the glass substrate of making electrode structure, dry then, sintering obtains dielectric layer.Though dielectric layer does not have the pattern precision requirement, but for front substrate medium layer, the transparency of rete, the consistency and the surface smoothness of thickness are had relatively high expectations, these defectives bubble, pin hole can not be arranged in dielectric layer and defective such as owe a little, because will cause the breakdown voltage resistant decline of deielectric-coating.
Dielectric paste is generally by unorganic glass powder, resinoid bond and solvent composition.According to the difference of softening point, dielectric paste is divided into two kinds of softening type and flow models.Flow model is meant the softening point of the sintering temperature of medium far above medium, and transmitance height, surface smoothness height behind the flow model dielectric paste sintering still cause the decline of dielectric layer insulation property more greatly with electrode reaction; The softening point and the sintering temperature of softening type dielectric paste are approaching, and surface smoothing is relatively poor, transmitance is low, but little with electrode reaction, and the insulation property of dielectric layer are good.
Do not find the method for desirable formation transparent dielectric layer in the prior art as yet, to obtain to have simultaneously the display screen transparent dielectric layer of excellent dielectric properties and excellent light transmittance.
Summary of the invention
The purpose of this invention is to provide a kind of electrical property of the transparent dielectric layer that can improve plasma display panel (PDP) simultaneously and the transparent dielectric paste of light transmittance.
Transparent dielectric paste according to the present invention comprises glass powder and organic carrier, and wherein, described glass powder is to be combined by the monodispersed glass dust that different-grain diameter distributes.
In one embodiment of the invention, described glass powder is to be combined by the inorganic powder (powder I) of D90=3～10 μ m and the inorganic powder (powder II) of D90=200～800nm.
In a kind of preferred implementation of the present invention, described glass powder is that the inorganic powder (powder II) by the inorganic powder of D90=3～5 μ m (powder I) and D90=600～800nm combines.
In further preferred embodiment, above-mentioned powder I accounts for 70～98% of glass powder total amount by weight.
In one embodiment of the invention, described glass powder is 60～90% of described slurry by weight.
Another aspect of the present invention also provides a kind of method of the transparent dielectric layer that is used to form plasma display panel (PDP) and uses the plasma display panel (PDP) that this method obtains.
The present invention is by the single inorganic powder particle that disperses with two kinds or more of particle size distribution, mix according to suitable proportioning, mix with organic carrier again and prepare the slurry that is used to form plasma display panel (PDP) prebasal plate transparent dielectric layer, adopt this slurry can reduce by for example silk screen printing, gap between the powder particle of the dielectric paste layer that methods such as coating form, minimizing transparent dielectric layer in carrying out high-temperature sintering process produces bubble, crackle, peel off, the possibility in spaces such as pin hole, reduce the thickness of transparent dielectric layer, thus the transmitance of raising transparent dielectric layer and breakdown voltage resistant.
Description of drawings
Fig. 1 is the structural representation of existing plasma display panel (PDP).
Embodiment
Main feature of the present invention is that single glass powder that disperses that different-grain diameter is distributed reasonably makes up, and is used to form the transparent dielectric layer of plasma display panel (PDP).
Transparent dielectric paste among the present invention mainly is made up of glass powder and organic carrier.Glass powder
Can be used for unorganic glass powder of the present invention can be the glass ingredient of the available all kinds of prior art proof, includes, but not limited to flint glass, for example PbO-B
2O
3-SiO
2, PbO-B
2O
3-ZnO and PbO-B
2O
3-SiO
2-ZnO; Lead-free phosphate glass, for example SnO-P
2O
5, ZnO-P
2O
5, R
2O-R ' O-P
2O
5(R is Li, Na, K; R ' is Ba, Ca), SnO-B
2O
3-P
2O
5And SnO-ZnO-P
2O
5B
2O
3-BaO-ZnO is a glass; Bi
2O
3-B
2O
3-BaO-ZnO is a glass; And Bi-B-Si is a glass.
In a kind of preferred implementation of the present invention, employing be Bi-B-Si glass frit material, this powder mainly comprises Bi
2O
3, B
2O
3, SiO
2, CaO and ZnO, wherein the percentage by weight of each component is respectively: Bi
2O
320～50%, B
2O
310～40%, SiO
25～20%, CaO10～40%, ZnO30～70%, Al
2O
30.5～5%, other can add MgO, BaO, Na
2O, K
2Oxide components such as O are regulated every physical property of glass dust.More than B in each component
2O
3Introduce Na by boric acid or boric anhydride
2O, K
2O is by its Na
2CO
3, K
2CO
3Introduce, all the other each components are all directly carried out mixing preparation by adding oxide.
When preparation meets the glass powder of requirement of the present invention, the commercially available glass powder with different-grain diameter that becomes to be grouped into by suiting can be mixed mutually, and directly obtain required glass powder.Alternately, be with different required glass ingredients by required mixed, through founding, conventional steps such as moulding and annealing make parent glass.Then, as requested that the parent glass powder is pure in needed size.In a typical operation, with required glass ingredient after batch mixer mixes, in the high temperature solid-phase sintering stove, fire more than 20 minutes at 800～1300 ℃, obtain the mixing material of even metal oxide, with it to the glass preform machine behind the compressing tablet, in ball grinder, carry out coarse crushing, further fine powder is broken with regard to available inorganic powder particle in planetary ball mill with the frit after the coarse crushing again, then, adopt suitable method, for example, further above-mentioned inorganic powder is crushed to multiple littler other size of level by the method for comminution by gas stream.
In a kind of embodiment of the present invention, adopt D90 (diameter of the particle of at least 90% volume) in the powder I of 3～10 μ m particle size range and D90 combination at the powder II of 200～800nm particle size range, preferably, wherein powder I accounts for 70～98% of glass powder total weight.If be lower than 70%, then correspondingly require to use too much small particle diameter inorganic powder, this can improve production cost undoubtedly; If be higher than 98%, then the gap between the bulky grain glass dust can not get effective filling, thereby can not get Expected Results.
In a kind of preferred implementation of the present invention, adopt D90 in the powder I of 3～5 μ m particle size range and D90 combination at the powder II of 600～800nm particle size range, preferably, wherein powder I accounts for 80～90% of glass powder total weight.
In the present invention, the inorganic powder total weight that is used for transparent dielectric paste accounts for 60～90% of slurry total weight.If be lower than 60%, owing to have more organic media in the rete that applies, it disperses inorganic powder excessively, thus prolonged the time of exhaust process and the dielectric layer that might behind sintering, form in more gap is still arranged; If be higher than 90%, because organic carrier very little, can not make inorganic powder mix, also be unfavorable for the even coating of slurry, simultaneously, filming does not have enough cementabilities yet.
Organic carrier
Be applicable to that the organic carrier among the present invention requires it that inorganic powder is had good dispersiveness, and can prevent the reunion between the inorganic powder particle; Good film forming and flow leveling to adapt to the requirement of silk screen printing, coating process, can obtain level and smooth rete; Can not bring influence, before reaching sintering temperature, require organic carrier to decompose fully substantially, can not cause defectives such as bubble, pin hole because of residual organic carrier to the sintering process of inorganic powder.
The organic carrier that meets above-mentioned requirements generally is made up of the resin of a high boiling solvent and a thickening power.
The requirement of selective solvent component is that resin has higher solubility in solvent, can obtain perfect solution; Solvent not with composition in other components react; Suitable volatility should be arranged to be applicable to silk screen printing or coating process and can to guarantee the stable of storage process medium viscosity.Be preferred for solvent among the present invention and be the high boiling organic solvent of boiling point between 150～300 ℃ under the normal pressure.Such solvent comprises fatty alcohol, aliphatic alcohol ester, for example acetic acid esters and propionic ester; Terpenes is as terpinol; Ethylene glycol and ester thereof are as ethylene glycol monobutyl ether and butyl cellosolve acetate; Carbitol ester is as butyl carbitol, acetate of butyl carbitol and carbitol acetic acid esters;
(2,2,4-trimethyl-1,3-pentanediol mono isobutyrate) and their mixed solvents that forms.
Above-mentioned resin require its decomposition temperature low and decompose after ash content low, employed resin generally comprises: alkyd resins, (methyl) acrylic resin, (methyl) acrylate, ethyl cellulose, NC Nitroncellulose etc., and they mix according to a certain percentage.Employed total resin weight is occupied 3～15% of airborne body total weight.
Can also in organic media, use an amount of plasticizer or claim flexibilizer,, also can make slurry have adhesivity so that dielectric layer has toughness preferably.Plasticizer can be multiple organic substance, dibutyl phthalate (DBP) for example, dioctyl phthalate (DOP), epoxidized soybean oil, tricresyl phosphate, triphenyl phosphate, di-n-octyl sebacate, chlorinated paraffin wax etc., its addition can be 0～10wt% of organic carrier.
The total weight of organic carrier accounts for 10～40% of slurry total weight.
For further improving the performance of slurry, also optionally add dispersant, sagging inhibitor, defoamer, levelling agent, thixotroping conditioning agent etc. therein.
The preparation of slurry
Get inorganic powder in blending tank according to predetermined weight fraction another name, and the organic carrier correspondingly of adding predetermined weight, on the high speed shear dispersing apparatus, carry out dispersing and mixing, then with the slurry that mixes through three beaming roller milling trains, further promote inorganic powder dispersion and with the fusion of organic carrier, the granularity of inorganic powder is less than 10 μ m to the slurry, carries out vacuum defoamation after the gained slurry is filtered through filter and promptly gets final sample.
Printing and fire condition
Use 325 purpose stainless steel cloths to print, the glass substrate that prints is placed 150 ℃ about 10 minutes of drying box, record the dry about 20 μ m of thicknesses of layers.
The selected curve of firing is 350 ℃ of insulation degassings 20 minutes, be warming up to then 580 ℃ and be incubated 20 minutes after cooling.
The preparation of inorganic powder: according to following prescription: Bi
2O
319%, B
2O
314%, SiO
29%, Al
2O
31.1 CaO 18%, ZnO 38%, and each oxide of MgO 0.9% weighing is 2kg altogether, mixes back 1200 ℃ of insulations 1 hour in the high temperature solid-phase sintering stove, obtains uniform glass metal.With this glass metal to the pair roller tablet press machine make its rapidly cooling and compacting into about the thick glass fragment of 1mm, with glass fragment put on ball mill, carry out to the ball grinder coarse crushing to the particle of glass powder less than 1mm.Glass powder is carried out the broken two kinds of glass powders that obtain D90 ≈ 3 μ m and D90 ≈ 700nm respectively of fine powder in an enterprising step of airslide disintegrating mill, above-mentioned two kinds of glass powders are mixed according to weight ratio at 9: 1, obtain being used to prepare the inorganic powder of slurry.
The preparation of organic carrier:, under stirring condition, be heated to 60 ℃ and be incubated to ethyl cellulose and dissolve the solution that obtains transparent and homogeneous fully according to weight ratio 6: 10: 84 weighing ethyl cellulose, acetate of butyl carbitol and terpinol respectively.
The preparation of slurry: after according to weight ratio 7: 3 inorganic powder and organic carrier being mixed, carry out dispersing and mixing on the high speed shear dispersing apparatus again, be rolled to granularity less than 5 μ m through three beaming roller mill rolls then, will carry out vacuum defoamation behind the gained slurries filtration.Mensuration viscosity is 23pas.
Make sample with this slurry by the method for silk screen printing on glass substrate, adopting spectrophotometric determination wavelength of transmitted light transmitance with respect to base plate glass when 400～800nm is 80～82%; In DIELECTRIC CONSTANT=12～13 that are determined on the dielectric constant testing equipment under the 1MHz.
Except that two kinds of glass powders according to 8.5: 1.5 mixed preparing inorganic powders of weight ratio, all the other conditions are identical with embodiment 1, the preparation slurry.Mensuration viscosity is 25pas.
Make sample with this slurry by the method for silk screen printing on glass substrate, adopting spectrophotometric determination wavelength of transmitted light transmitance with respect to base plate glass when 400～800nm is 77～80%; In DIELECTRIC CONSTANT=11～13 that are determined on the dielectric constant testing equipment under the 1MHz.
Comparative Examples 1
Inorganic powder only adopts the glass powder of D90 ≈ 3 μ m, and all the other conditions are identical with embodiment 1, the preparation slurry.Mensuration viscosity is 28pas.
Make sample with this slurry by the method for silk screen printing on glass substrate, adopting spectrophotometric determination wavelength of transmitted light transmitance with respect to base plate glass when 400～800nm is 61～65%; In DIELECTRIC CONSTANT=7～9 that are determined on the dielectric constant testing equipment under the 1MHz.
The monodispersed inorganic powder particle of the present invention by two kinds or more of different-grain diameters are distributed, mix according to certain proportioning, mix with organic carrier again and prepare transparent dielectric paste, thereby in the dielectric layer that adopts printing or coating method to form, space between the big inorganic powder particle is filled by little inorganic powder particle, in the feasible dielectric paste film that applies, gap between the glass powder particle reduces, pile up tightr, reduced transparent dielectric layer generation bubble in carrying out high-temperature sintering process, crackle, peel off, the possibility in spaces such as pin hole, transparent dielectric layer is breakdown voltage resistant to be improved, can reduce simultaneously the thickness of transparent dielectric layer, improve light transmittance.
Although described spirit of the present invention in detail by specific implementations, these execution modes only are for exemplary purposes rather than limit the present invention.It should be understood that those skilled in the art can be under the prerequisite that does not deviate from scope and spirit of the present invention, change and revise for embodiment.For example, those skilled in the art are easy to expect being different from the disclosed mechanical fraction mode of the foregoing description after obtaining above-mentioned instruction, and these all should be encompassed within claims of the present invention institute restricted portion.
Claims (9)
1. a transparent dielectric paste comprises glass powder and organic carrier, it is characterized in that, described glass powder is that the glass powder by the different-grain diameter specification of D90 between 200nm～10 μ m combines.
2. transparent dielectric paste according to claim 1, wherein, described glass powder is to be combined by D90=3～first glass powder of 10 μ m and second glass powder of D90=200～800nm.
3. transparent dielectric paste according to claim 2, wherein, described glass powder is to be combined by D90=3～first glass powder of 5 μ m and second glass powder of D90=600～800nm.
4. transparent dielectric paste according to claim 1, wherein, described first glass powder accounts for 70～98% of glass powder total amount by weight.
5. transparent dielectric paste according to claim 1, wherein, described glass powder is 60～90% of described slurry by weight.
6. a plasma display panel (PDP) is characterized in that, the slurry that is used to make the transparent dielectric layer on the prebasal plate contains the glass powder of the different-grain diameter specification of D90 between 200nm～10 μ m.
7. plasma display panel (PDP) according to claim 6, wherein, described transparent medium glass powder is to be combined by D90=3～first glass powder of 10 μ m and second glass powder of D90=200～800nm.
8. a method that is used to form the transparent dielectric layer on the plasma display panel (PDP) prebasal plate comprises the glass powder of the different-grain diameter specification of D90 between 200nm～10 μ m and the step of organic carrier mixed preparing transparent dielectric paste.
9. described according to Claim 8 method, wherein, described glass powder is to be combined by D90=3～first glass powder of 10 μ m and second glass powder of D90=200～800nm.
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|---|---|---|---|
| CN 200810115934 CN101620967B (en) | 2008-06-30 | 2008-06-30 | Transparent dielectric paste and plasma display screen applying same |
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| CN101620967A true CN101620967A (en) | 2010-01-06 |
| CN101620967B CN101620967B (en) | 2012-12-12 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950600A (en) * | 2010-09-29 | 2011-01-19 | 彩虹集团公司 | Transparent dielectric paste |
| CN102064064A (en) * | 2010-10-18 | 2011-05-18 | 安徽鑫昊等离子显示器件有限公司 | Front dielectric paste and preparation method thereof |
| CN102070302A (en) * | 2010-11-22 | 2011-05-25 | 珠海彩珠实业有限公司 | Transparent low-melting point glass powder for dielectric paste and preparation method thereof |
| CN107201083A (en) * | 2017-05-25 | 2017-09-26 | 山东国瓷康立泰新材料科技有限公司 | A kind of ink-jet anti slip glass ink and preparation method thereof |
| CN109282169A (en) * | 2017-07-21 | 2019-01-29 | 深圳光峰科技股份有限公司 | Wavelength converter, light source and projection arrangement comprising it |
| CN110849512A (en) * | 2019-11-14 | 2020-02-28 | 苏州市东科电子有限公司 | Pretreatment method of glass sealing medium material for ceramic capacitor pressure sensor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3116844B2 (en) * | 1996-06-21 | 2000-12-11 | 日本電気株式会社 | Color plasma display panel and method of manufacturing the same |
| KR100495488B1 (en) * | 2002-12-07 | 2005-06-16 | 엘지마이크론 주식회사 | Rear plate for plasma display panel |
| US7736762B2 (en) * | 2005-10-03 | 2010-06-15 | Panasonic Corporation | Plasma display panel |
-
2008
- 2008-06-30 CN CN 200810115934 patent/CN101620967B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950600A (en) * | 2010-09-29 | 2011-01-19 | 彩虹集团公司 | Transparent dielectric paste |
| CN102064064A (en) * | 2010-10-18 | 2011-05-18 | 安徽鑫昊等离子显示器件有限公司 | Front dielectric paste and preparation method thereof |
| CN102070302A (en) * | 2010-11-22 | 2011-05-25 | 珠海彩珠实业有限公司 | Transparent low-melting point glass powder for dielectric paste and preparation method thereof |
| CN107201083A (en) * | 2017-05-25 | 2017-09-26 | 山东国瓷康立泰新材料科技有限公司 | A kind of ink-jet anti slip glass ink and preparation method thereof |
| CN109282169A (en) * | 2017-07-21 | 2019-01-29 | 深圳光峰科技股份有限公司 | Wavelength converter, light source and projection arrangement comprising it |
| CN110849512A (en) * | 2019-11-14 | 2020-02-28 | 苏州市东科电子有限公司 | Pretreatment method of glass sealing medium material for ceramic capacitor pressure sensor |
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