EP0742572A2 - Verfahren zur Herstellung eines Plasma-Anzeigegeräts - Google Patents

Verfahren zur Herstellung eines Plasma-Anzeigegeräts Download PDF

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Publication number
EP0742572A2
EP0742572A2 EP96112109A EP96112109A EP0742572A2 EP 0742572 A2 EP0742572 A2 EP 0742572A2 EP 96112109 A EP96112109 A EP 96112109A EP 96112109 A EP96112109 A EP 96112109A EP 0742572 A2 EP0742572 A2 EP 0742572A2
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EP
European Patent Office
Prior art keywords
layer
dielectric
dielectric layer
patterned
unpatterned
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP96112109A
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English (en)
French (fr)
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EP0742572A3 (de
Inventor
Hiroshi Tamemasa
Carl Baasun Wang
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EIDP Inc
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EI Du Pont de Nemours and Co
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Priority claimed from EP93113250A external-priority patent/EP0613166B1/de
Publication of EP0742572A2 publication Critical patent/EP0742572A2/de
Publication of EP0742572A3 publication Critical patent/EP0742572A3/xx
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
    • H01J11/10—AC-PDPs with at least one main electrode being out of contact with the plasma
    • H01J11/14—AC-PDPs with at least one main electrode being out of contact with the plasma with main electrodes provided only on one side of the discharge space
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
    • H01J11/20—Constructional details
    • H01J11/34—Vessels, containers or parts thereof, e.g. substrates
    • H01J11/36—Spacers, barriers, ribs, partitions or the like
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/241—Manufacture or joining of vessels, leading-in conductors or bases the vessel being for a flat panel display
    • H01J9/242—Spacers between faceplate and backplate

Definitions

  • the invention relates to a method of making a plasma display apparatus comprising a plurality of stripe-shaped electrodes arranged in a matrix, a dot-shaped discharge area or pixel area at each solid intersection between said stripe-shaped electrodes and a fluorescent film formed on each of said discharge areas and adapted to emit light when said fluorescent film is excited by ultraviolet rays from the corresponding discharge area.
  • the plasma display apparatus typically comprises a pair of forward and backward insulation substrates arranged opposed to each other to form a discharge space therebetween, said discharge space containing a gaseous mixture of He with a trace of Xenon and others, a group of stripe-shaped electrodes on the opposed surfaces of said insulation substrates, said stripe-shaped electrodes being arranged to form a matrix pattern in said discharge space, said matrix parting said discharge space into a plurality of discharge gas containing sub-spaces, each intersection between said stripe-shaped electrodes corresponding to a pixel, and a fluorescent film in each of said sub-spaces.
  • the forward insulation substrate 1 is formed of sheet glass, with the internal surface thereof including a film-type light-blocking mask 2 formed thereon and first stripe-shaped electrodes 3 arranged side by side on the internal surface of the substrate 1 in one direction, these electrodes 3 functioning as anodes.
  • the internal surface of the other or backward substrate 4 is similarly formed of sheet glass and the internal surface thereof includes second stripe-shaped electrodes 7 arranged to extend in a direction perpendicular to the lengths of the first electrodes 3, these electrodes 7 functioning as cathodes.
  • the first and second electrodes 3, 7 are separated from each other by dielectric partitions 8.
  • a dot-like discharge area 9 is formed at each of the intersections between the first and second electrodes 3, 7.
  • the discharge area 9 contains a discharge gas containing Xenon.
  • a dot-like fluorescent film 10 for color display is formed on the surface of each of the second electrodes 3.
  • Each of the partitions 8 is formed to have a thickness ranged between 100 microns and 200 microns by repeated thick-film printing of insulation paste.
  • the discharge gas is a two-component mixture gas containing He and Xe, a three-component mixture gas containing He, Xe and any other suitable component or a single gas (e.g. Xe).
  • the discharge gas is sealed within the corresponding discharge area 9 under the pressure of 10 to 500 Torr., depending on the composition thereof.
  • Such a plasma display apparatus of the prior art was provided by repeating the thick film process to form partitions having a thickness ranged between 100 microns and 600 microns on an insulation substrate to define a plurality of dot-like discharge areas thereon or by performing the thick film printing process to form partitions as described, applying a paste containing silver in a groove surrounded and defined by said partitions, and firing the paste to form a group of electrodes. Thereafter, a fluorescent material is placed and fired in a recess formed by said partitions to form a fluorescent member covering one of the electrodes (i.e. one disposed on the backside of the substrate). When these frontside and backside substrates are superposed on each other, sealing, discharging and other gases are sealed therebetween to complete a plasma display apparatus.
  • the prior art process requires too many producing steps which would reduce the mass-producibility and increase the manufacturing cost. Since the electrodes, partitions and others are formed by repeating the thick-wall printing and firing steps, possible dot pitch is limited. The thickness of film must be controlled with high accuracy. Further, the substrates must be superposed and fixed to each other with a high precision.
  • An object of the invention is to provide a method which can produce readily and in good yield a plasma display apparatus having a number of electrodes arranged with high precision and reduced dot pitch.
  • Another object of the invention is to produce easily and inexpensively a plasma display apparatus with a good manufacturing precision to allow the stabilization of performance.
  • the invention provides a method of making a plasma display apparatus which comprises the steps of forming a plurality of first electrodes on one of a plurality of dielectric substrates to extend in one direction; forming a plurality of second electrodes on the other substrate to extend in another direction perpendicular to said one direction; forming a ridge on at least one of said substrates to define a plurality of pixel areas; and providing a fluorescent material in said pixel areas, the improvement in which a relief corresponding to said ridge is fabricated by the steps of:
  • the invention further provides a method of making a plasma display apparatus, the improvement in which the ridge is fabricated by the steps of:
  • the partial drying employed in the invention is performed under such a certain heating condition that the dispersibility changing agent can be diffused from the surface of the patterned dielectric layer into the interior of the unpatterned dielectric layer adjacent to said dielectric layer.
  • the heating condition can be decided by a function of heating temperature and time which can be varied depending on the boiling points of the dispersibility changing agent, solvent or the like.
  • partial drying may be carried out at a relatively low temperature of 50-60°C for a short time of about 1-5 minutes.
  • the dielectric layer for providing an electrical circuit on the substrate is formed in a desired pattern from a plurality of layers comprising the organic polymer.
  • the upper layer of the organic polymer serving as the patterned dielectric layer can be of the thickness in the range of 10-30 microns.
  • the lower layer of the organic polymer serving as the unpatterned dielectric layer which underlies the pattern and changes the dispersibility in the solvent by the diffusion of the dispersibility changing agent from the patterned layer can be of much larger thickness of 10-100 microns.
  • the thickness of the patterned layer is primarily limited by the method of application rather than by consideration of operability.
  • a diffusion patterning process can be employed which includes providing a first layer comprising an organic polymer on the substrate, further providing thereon a patterned second layer comprising an organic polymer, a solvent and a dispersibility changing agent which serves as a dispersing agent for polymer constituting the first layer, but does not dissolve in the solvent, drying the patterned second layer, removal of the solvent and diffusion of the dispersibility changing agent from the second layer into the first layer in accordance with the formed pattern, whereby the dispersibility in the solvent in the first layer is varied depending on the pattern formed in the upper layer.
  • the areas in the first and second layers in which the dispersibility in the solvent is varied in accordance with the formed pattern are soluble in the solvent, those areas are removed by the subsequent solvent washing (negative-working patterning process).
  • the areas in the first and second layers are insoluble in the solvent, only the areas in which the dispersibility in the solvent is varied leave after the solvent washing step (positive-working patternig process).
  • the desired pattern is formed on the substrate from the organic polyer film.
  • the amount of the dispersibility changing agent including solubilizer and insolubilizer in the patterned second layer must be sufficient to provide a change of the dispersibility in the solvent by diffusion into the underlying unpatterned first layer comprising the organic polymer (called hereafter “unpatterned layer”).
  • the patterned layer will contain at least 10% weight of the dispersibility changing agent, i.e. solubilizer or insolubilizer and may contain as much as 90% weight depending on the solubility of the respective polymers.
  • a plasticizer or other solubilizing agent may be added to the underlying unpatterned layer in order to make the polymer more susceptible to the action of the solubilizing agent which is diffused from the patterned layer.
  • the dielectric pastes for the formation of the unpatterned layer are typically printed twice with 200 mesh screens at one to two inches per second squeegee speed.
  • the patterning pastes are printed over the dielectric at higher speeds, since only a small part of the screen is open mesh.
  • the negative-working patterning process is employed in the present invention.
  • the patterned dielectric layer containing the solubilizer is dried or heated to allow the solubilizer to diffuse in the unpatterned dielectric layer in compliance with the pattern to be formed, and the specified area of the dielectric layer patterned by diffusion is removed with a solvent to define a discharge area on a dielectric substrate constituting a plasma display apparatus.
  • the conductor pastes used for the formation of electrodes are printed on the substrate with a 325 or 400 mesh screen, depending on the conductor thickness and resolution desired. Patterning pastes are likewise printed with a 325 or 400 mesh screen, to optimize the amount of plasticizer delivered to the underprint (unpatterned layer). Thinner screens and fewer prints are needed than with the dielectric, because of the thinner films typically used with conductors.
  • any polymers known in the art can be used as the material for the preparation of the above pastes.
  • Representative examples of those polymers include cellulosic polymers such as ethyl cellulose, polystyrene polyacrylates (including methacrylates), poly(vinyl acetate), poly(vinyl butyral), poly(vinyl chloride), phenol-formaldehyde resins or the like.
  • plasticizers which are compatible with ethyl cellulose, a typical polymer used in the patterning paste: acid esters of abietic acid (methyl abietate), acetic acid esters (cumphenylacetate), adipic acid derivatives (e.g.
  • benzyloctyl adipate diisodecyl adipate, tridecyl adipate
  • azelaic acid esters such as diisooctyl azelate, diethylene glycol dibenzoate, triethylene glycol dibenzoate, citrates such as triethyl citrate, epoxy type plasticizers, polyvinyl methyl ethers, glycerol mono-, di-, and triacetates, ethylene glycol diacetate, polyethylene glycol 200 to 1000, phthalate esters (dimethyl to dibutyl), isophthalic acid esters (dimethyl, diisooctyl, di-2-ethylhexyl), mellitates such as trioctyl trimellitate and isooctylisodecyl trimellitate, isopropyl myristate, methyl and propyl oleates, isopropyl and isooctyl palmitates
  • Fig. 1 is an elevational view in section of the primary parts of a plasma display apparatus constructed by the present invention, especially showing the relationship of ridges formed of the dielectric and discharge spaces with dielectric substrates.
  • Fig. 2 is a foreshortened view in plan, partly in section of the plasma display apparatus constructed by the invention.
  • Fig. 3 is a perspective view showing the structures of ridges and Y electrodes in the plasma display apparatus constructed by the invention.
  • Fig. 4 is a flow sheet illustrating one example to form a negative-working pattern by a diffusion patterning process of the invention.
  • Fig. 5 is a flow sheet illustrating another example according to the invention.
  • Fig. 6 is a flow sheet illustrating other example according to the invention.
  • Fig. 7 is a flow sheet illustrating further example according to the invention.
  • Fig. 8 is a cross-section illustrating the primary parts of a plasma display apparatus constructed by the prior art.
  • a plasma display apparatus of the present invention which comprises first and second dielectric substrates 1, 2 of a sheet glass having a thickness equal to 2 mm, a plurality of X electrodes (first electrodes) laterally extending on the inner face of the first substrate 2, a plurality of Y electrodes (second electrodes) longitudinally extending on the inner face of the second substrate 2, and a plurality of fluorescent materials 5 for converting discharged ultraviolet rays into visible rays.
  • the plasma display apparatus also comprises a matrix-like (or mesh-like) ridge 10 which defines a plurality of pixel areas and is adapted to provide a partition wall for maintaining the spacing between the first and second substrates 1, 2.
  • Each of the (line) X electrodes 3 is disposed on dielectric layer 14 to electrically insulate from the (column) Y electrodes, and another dielectric layer 18 is arranged over the line electrodes 3 to separate from a discharge space 19.
  • Protective layer 16 may be provided on dielectric layer 18.
  • Each of the fluorescent materials 5 is formed by pouring a luminescence color fluorescent material into each of recesses 13 which are formed by the matrix-like ridge 10.
  • the fluorescent material may be Zn 2 SiO 4 :Mn for green color, (Y 1 Gd) BO 3 :Eu 3+ for red color or BaMgAl 14 O 23 :Eu 2+ for blue color.
  • a discharge space 19 formed between the substrates 1, 2 by the matrix-like ridge 10 is filled with any suitable mixture gas, for example, consisting of neon and xenon.
  • a discharge cell is formed at each of the intersections between the X electrodes 3 and the Y electrodes 4. When each discharging cell is energized, one fluorescent material 5 corresponding to the energized cell is excited to emit light.
  • the fluorescent material 5 may be selectively excited through the intersecting electrodes 3 and 4.
  • the ridges 10 in the plasma display apparatus shown in Figs. 1 to 3 can be formed, for example by a negative-working patterning process shown in Figs. 4 to 7. That is, the ridges are formed through the formation of a negative pattern and development (Fig. 4) or the formation of a negative pattern and simultaneous development (Fig. 5) using a diffusion patterning process. These processes are largely classified into three negative-working patterning processes which include a process comprising the step of incompletely removing the solvent (Fig. 4), a process comprising the step of partially developing and the combination thereof (not shown).
  • a thick film dielectric paste layer 23 is applied on a glass substrate 21 by screen printing.
  • the thick film paste is comprised of finely divided glass particles dispersed in an organic medium comprising an acid labile polymer dissolved in dibutyl phthalate plasticizer and terpineol.
  • the layer is heated at a temperature of about 50-60°C for about 1-5 minutes to incompletely remove terpineol (see, Fig. 4(a)).
  • a second patterned layer 25 is screen-printed on a thick film layer 23 containing a part of a solvent.
  • the second layer is a liquid solution comprising p-toluenesulfonic acid, dibutyl phthalate and terpineol (see, Fig. 4(b)).
  • an assembly is dried by heating at a relatively lower temperature of 50-60°C for about 1-5 minutes, upon which terpineol evaporates from the layer 25, p-toluenesulfonic acid and dibutyl phthalate diffuse into an area in contact with the thick film patterned dielectric layer 25 of the underlying unpatterned layer comprising the thick film dielectric paste and the acid reacts with the acid labile group of the polymer in the unpatterned layer 23 to render part of the polymer water-dispersible (see, Fig. 4(c)).
  • the unpatterned layer 27 comprising the second thick film dielectric paste having the same composition as the first unpatterned layer 23, which is then heated at a temperature of about 50-60°C for about 1-5 minutes as in the step (a) in Fig. 4 to incompletely remove terpineol (see, Fig. 4(d)).
  • the second patterned layer 29 having the same composition as the first patterned layer is screen-printed on the second unpatterned layer 27 in semi-dried state from which only part of the solvent was evaporated.
  • the assembly formed of the patterned layers 29, 25 and the unpatterned layers 27, 23 in two layers is dried at a lower temperature of about 50-60°C for about 1-5 minutes, whereby terpineol as the solvent evaporates from the second patterned layer 29, the solvent contained in the layer 29 is incompletely removed and simultaneously the acid and dibutyl phthalate diffuse into the area in contact with the patterned dielectric layer 29 of the underlying unpatterned dielectric layer 27, and the acid reacts with the acid labile group of the polymer in the unpatterned layer 27 to make part of the polymer water-dispersible (see, Fig. 4(f)).
  • a diffusion of the dispersibility changing agent into the unpatterned layer 23 through the patterned layer 25 is enhanced together with the evaporation of the solvent from the patterned layer 25.
  • the steps (a) to (c) in Fig. 4 are repeated N times.
  • the assembly of the thick film dielectric corresponding to the thickness (TXN) of the unpatterned layer of the dielectric paste is completely dried, for example by heating at about 90°C for about 10 minutes, by which the desired pattern is formed by diffusion within the unpatterned layer and the whole pattern forming areas become a solvent-soluble state (see, Fig. 4(i)).
  • the patterned layer comprises principally small amounts of residual acid and dibutyl phthalate.
  • the assembly is washed with water having a pH of at least 7 to remove the underlying diffusion patterned and solvent-soluble areas 31 (called hereafter "pattern forming area").
  • pattern forming area Most of the pattern forming areas comprises the solubilized acid labile polymer and other materials in an image area underlying the thick film layer.
  • the pattern forming area 31 is removed from the assembly of the thick film dielectric to expose the surface of the substrate 21 corresponding to the pattern forming area 31, whereby very precise negative image (relief) leaves on the surface of the substrate 21 (see, Fig. 4(j)). Subsequently, the thus patterned dielectric is fired.
  • the ridge 10 is formed by the patterned dielectric on the dielectric substrate 1 as shown in Fig. 1.
  • a pair of the dielectric substrates at each of the display and back surface sides is oppositely superimposed on each of recesses 13 having a depth of, e.g., 25-600 ⁇ m depending on the pitch size of pixel, thereby to form a discharge space 19 for each pixel area as shown in Fig. 1.
  • the conductor is applied onto the opposite second substrate to form a line electrode group.
  • the line electrode groups 3, 4 are formed by screen-printing (thick film process) on the substrate a paste comprising a metal component selected from the group consisting of Au, Ni, Al, Cu and Ag to provide an electrode layer and firing the layer.
  • the width of the electrode layer may be larger than that of the final electrodes, since the electrode groups 3, 4 are formed by partially removing the electrode layer.
  • Fig. 4 illustrates a negative-working patterning process comprising the steps of dielectric printing/incomplete drying under the condition wherein the dielectric patterned and unpatterned layers are partially dried at an elevated temperature, e.g. 90°C for a long time without complete removal of the solvent in the dielectric layer to maintain part of the solvent contained in the layer; DP print; DP diffusion (drying at low temperature for short time); and development.
  • This patterning process of the present invention can prevent the formation of barrier referred to as "gap" which is brought by over-drying of the polymer in the layer and dense bond of the polymers as a result of repeated high temperature drying of the patterned and unpatterned dielectric layers comprising organic polymer which has been encountered in the prior art.
  • the present invention can provide the advantages that the dielectric ridges forming a discharge space in the plasma display apparatus can be fabricated with high precision in compliance with the desired pattern with no obstacle to the permeation of the developer in the development step into the pattern forming area formed in the assembly of the dielectric layer.
  • the present invention can perform the fabrication of electrodes, ridges or the like by a thick film printing technique in the production of the plasma display apparatus requiring the precision of film thickness and having the oppositely arranged structure of a pair of the glass substrates at the display and back surface sides.
  • the film thickness control of the dielectric paste constituting the patterned and unpatterned layers on printing and drying is required and in particular the lamination of the patterned layer and the unpatterned layer is frequently done, the surface smoothness of each dielectric paste layer and the uniformity of the film thickness are required.
  • the dielectric paste layer is not in the completely dried state in which all solvents were evaporated from the underlying paste, but in the state containing part of the solvent.
  • surface smoothness of the underlying layers and uniformity of the film thickness can be readily achieved.
  • a protective layer 16 consisting of magnesium oxide may be coated successively.
  • Each of the recesses 13 defined by the ridge 10 is filled with a fluorescent material 5 at the bottom.
  • each of the fluorescent material 5 is formed by depositing a fluorescent material on the inner bottom face 13 of the corresponding recess, for example, Zn 2 SiO 4 emitting a green-colored light.
  • fluorescent materials for emitting red(R)-, green(G)- and blue(B)-colors are sequentially deposited on the inner bottom face of each discharge area for each pixel area line in the X or Y direction or for each pixel area PA (Fig. 3).
  • the glass substrate 2 is superposed over the display side glass substrate 1.
  • the space between the glass substrates 1, 2 is sealed by sealing glass and at the same time a discharge mixture gas is sealingly enclosed in the space.
  • a plasma display (PD) apparatus is thus assembled.
  • the said diffusion patterning process may be applied to both substrates 1 and 2 to fabricate the ridge or the entire partition wall.
  • a patterning process including the step of incompletely removing a solvent in the dielectric layers will be explained in order of the process step.
  • a first patterned layer 113 comprising, e.g., p-toluenesulfonic acid, dibutyl phthalate and terpineol is applied on a substrate 111 and this layer is dried at a temperature of e.g. about 50-60°C for about 1-5 minutes (see, Fig. 5(a)).
  • a first unpatterned layer 115 and a second unpatterned layer 117 which are soluble in a predetermined solvent are provided on the first patterned layer 113, which is dried by heating at a temperature of e.g. 50-60°C for about 1-5 minutes.
  • a temperature of e.g. 50-60°C for about 1-5 minutes.
  • Terpineol evaporates from the first patterned layer 113, the acid and dibutyl phthalate diffuse into the area of the upper thick film dielectric unpatterned layer 115 in contact with the patterned layer 113, by which the acid reacts with the acid labile group of the polymer in the unpatterned layer 115 to render part of the polymer water-dispersible.
  • the second unpatterned layer 117 of the thick film dielectric is screen-printed on the first unpatterned layer 115, which is then dried by heating at a temperature of e.g. about 50-60°C for about 1-5 minutes as in the step (a) (see, Fig. 5(b)).
  • a second patterned layer 119 is screen-printed on the second unpatterned layer 117, which is dried by heating at a temperature of e.g. about 50-60°C for about 1-5 minutes.
  • the solvent, terpineol evaporates from the second patterned layer 119, the acid and dibutyl phthalate diffuse into the area of the underlying thick film dielectric unpatterned layer 117 in contact with the patterned layer (see, Fig. 5(c)).
  • two layers of unpatterned layers 121, 123 are simultaneously superimposed on the second patterned layer 119, which is then dried at a temperature of e.g. about 50-60°C for about 1-5 minutes (see, Fig. 5(d)).
  • the steps (b) to (d) shown in Fig. 5 are repeated N times to form an assembly of the thick film dielectric having the thickness (height) corresponding to the thickness TXN of the unpatterned layer, which is completely dried by heating e.g. at 90°C for about 10 minutes.
  • the desired pattern is formed by diffusion in the unpatterned layer of the assembly and the whole pattern forming areas 125 are in the state soluble in the solvent (see, Fig. 5(e)).
  • a first unpatterned layer 213 of the thick film dielectric paste is screen-printed on a glass substrate 211.
  • the thick film dielectric paste comprises finely divided glass particles dispersed in an organic medium containing the acid labile polymer dissolved in dibutyl phthalate plasticizer and terpineol.
  • the first unpatterned layer is heated at a temperature of about 50-60°C for about 1-5 minutes to incompletely remove terpineol (see, Fig. 6(a)).
  • a first patterned layer 215 is screen-printed on a first unpatterned layer 213 containing part of the solvent.
  • the first patterned layer is a liquid solution comprising p-toluenesulfonic acid, dibutylphthalate and terpineol.
  • an assembly is dried by heating at a relatively bower temperature of 50-60°C for about 1-5 minutes, upon which terpineol evaporates from the layer 215, p-toluenesulfonic acid and dibutylphthalate diffuse into an area in contact with the thick film patterned dielectric layer 215 of the underlying unpatterned layer comprising the thick film dielectric paste and said acid reacts with the acid labile group of the polymer in the unpatterned layer 213 to render part of the polymer water-dispersible (see, Fig. 6(b)).
  • the thick film patterned dielectric layer 215 is screen-printed the second and third unpatterned layers 217, 219 comprising the second thick film dielectric paste having the same composition as the first unpatterned layer 213, which is then heated at a temperature of about 50-60°C for about 1-5 minutes as in the step (a) in Fig. 4 to incompletely remove terpineol (see, Fig. 6(c)).
  • the third patterned layer 221 having the same composition as the first patterned layer is screen-printed on the third unpatterned layer 219 in a semi-dried state from which only part of the solvent was evaporated.
  • the assembly formed of the patterned layers 221, 215 and the unpatterned layers 219, 217 in two layers is dried at a lower temperature of about 50-60°C for about 1-5 minutes, whereby terpineol as the solvent evaporates from the third patterned layer 221, the solvent contained in the layer 221 is incompletely removed and simultaneously the acid and dibutylphthalate diffuse into the area in contact with the patterned dielectric layer 221 of the underlying unpatterned dielectric layer 219, and the acid reacts with the acid labile group of the polymer in the unpatterned layer 219 to render part of the polymer water-dispersible.
  • a diffusion of the dispersibility changing agent into the unpatterned layer 217 through the patterned layer 215 is enhanced together with the evaporation of the solvent from the patterned layer 25.
  • the steps (a) to (c) in Fig. 6 are repeated N times.
  • the assembly of the thick film dielectric corresponding to the thickness (TXN) of the unpatterned layer of the dielectric paste is completely dried, for example by heating at about 90°C for about 10 minutes, by which the desired pattern is formed by diffusion within the unpatterned layer and the whole pattern forming areas become a solvent-soluble state (see, Fig. 6(d)).
  • the patterned layer comprises principally small amounts of residual acid and dibutyl phthalate.
  • the assembly is washed with water having a pH of at least 7 to remove the underlying diffusion patterned and solvent-soluble areas 231 (called hereafter "pattern forming area").
  • pattern forming area Most of the pattern forming areas comprises the solubilized acid labile polymer and other materials in an image area underlying the thick film layer.
  • the pattern forming area 231 is removed from the assembly of the thick film dielectric to expose the surface of the substrate 211 corresponding to the pattern forming area 31, whereby very precise negative image (relief) leaves on the surface of the substrate 211 (see, Fig. 6(e)).
  • the thus patterned dielectric is fired.
  • the ridge 10 is formed by the patterned dielectric on the dielectric substrate 211.
  • Fig. 7 shows a negative-working diffusion patterning process including a partial development step according to the present invention.
  • Step (a) shown in Fig. 7 a thick film dielectric paste layer 313 formed of finely divided glass particles dispersed in an organic medium containing an acid labile polymer dissolved in dibutyl phthalate plasticizer and terpineol is applied on a glass substrate 311 by screen printing.
  • the printed layer 313 is heated at 80°C for about 1-10 minutes to remove terpineol (see, Fig. 7(a)).
  • the patterned layer 315 is screen-printed on a layer 313 not containing the solvent.
  • the patterned layer is a liquid solution comprising p-toluenesulfonic acid, dibutyl phthalate and terpineol.
  • an assembly is heated at 90°C, upon which terpineol evaporates from the layer 315, p-toluenesulfonic acid and dibutyl phthalate diffuse into an area underlying the thick film dielectric layer and the acid reacts with the acid labile group of the polymer to render part of the polymer water-dispersible (see, Fig. 7(b)).
  • the patterned layer 315 comprising principally small amounts of residual acid and dibutyl phthalate is washed with water having a pH of at least 7, for example at a temperature of about 25-35°C for 10-20 seconds to remove partially the underlying diffusion patterned layer 313.
  • Most of the layer 313 comprises a solubilized acid labile polymer and other materials in an image area underlying the thick film layer (see, Fig. 7(c)).
  • a thick film paste layer 317 is screen-printed thereon and dried by heating at 80°C for about 1-10 minutes to remove terpineol (see, Fig. 7(d)).
  • a patterned layer 319 is applied onto the dielectric paste layer 317 and an assembly is heated at 90°C (see, Fig. 7(e)). Subsequently, the step of removing partially the diffusion patterned layer is repeated N times in a similar manner as in step (c) to form an assembly of the thick film dielectric corresponding to the thickness (TXN) of the unpatterned layer of the dielectric paste, after which the desired pattern is formed by diffusion in the unpatterned layer and the whole pattern forming areas become a solvent-soluble state (see, Fig. 7(f)).
  • the whole pattern forming areas 331 are removed by washing at a temperature of about 45°C with water having a pH of at least 7, by which very precise negative image (relief) leaves on the surface of the substrate 311 (see, Fig. 7(g)).
  • the ridge 10 has been explained about the case of utilizing as a partition wall for parting a display pixel, but the ridge may be provided on a glass substrate 2 at the display side, separately of the ridges 10 provided on the first substrate 1.
  • the plasma display apparatus having a number of electrode groups arranged in high precision can be readily produced in good yield.
  • High manufacturing precision results in stabilization of performance.
  • the following example illustrates the formulation of the dielectric paste and patterning paste.
  • Glass A has a D 50 of ca. 4 to 4.5 microns; it is milled and classified to remove coarse and fine fractions. Its D 10 is about 1.6 microns; and D 90 is 10-12 microns. Surface area is 1.5 to 1.8 m 2 /g.
  • Glass B is a barium borosilicate glass used to lower the sintering temperature of the dielectric composite, due to the large particle size of glass A. Its formula follows: BaO 37.5% wt. B 2 O 3 38.3 SiO 2 16.5 MgO 4.3 ZrO 2 3.0
  • Alumina A is a 1 micron powder with a narrow particle size distribution: D 10 , D 50 , and D 90 are, respectively, ca. 0.5, 1.1, and 2.7 microns. It is classified by settling to remove coarses and fines. Surface area is about 2.7-2.8 m 2 /g.
  • Alumina B is a 0.4 micron average particle size powder with surface area of about 5 m 2 /g. Patterning Paste Alumina A 60.0 grams Hydrogenated Castor Oil 1.4 Mineral Spirits 4.0 Colorant 2.2 Ethyl Cellulose T-200 4.3 Terpineol 11.9 Butyl Benzyl Phthalate 16.2
  • the materials were processed by printing the dielectric one, two, or three times, with each print followed by drying 1 to 5 minutes at 40 to 60°C.
  • the patterning paste was then printed by using a via fill screen with several sizes of via openings.
  • the patterning paste was then dried at 80 to 100°C for 5 to 10 minutes.
  • the pattern was then generated in the dielectric by immersing the overprinted layers in 1.1.1-trichloroethane with ultrasonic agitation until the overprinted areas were removed and the areas underlying the overprinted patterning paste were dissolved away.
  • the ridge of the dielectric was resolved with the height of up to 300 microns in the width of 80-150 microns and with good edge definition, which indicates much superiority in resolution and thickness to that achieved by a single patterning procedure with screen printing.
  • methyl and ethyl methacrylate may be combined to allow positive or negative-working resists.
  • plasticizers such as triethylene glycol would produce a negative-working resist in ethanol pattern generating solvent.
  • a calcium zinc silicate glass was formulated with a cellulose vehicle and 3% butyl benzyl phthalate.
  • a film of each paste was screen-printed onto an alumina substrate and dried at 95°-100°C.
  • a patterning paste containing 7 g alumina, 3.5 g Tergitol® TMN-6, 3.15 g of terpineol isomers and 0.35 g ethyl cellulose was screen-printed onto the dried dielectric paste layers and heated at 95°-100°C to dry the overprinted paste and to effect diffusion of the Tergitol detergent into the underlying dielectric layer.
  • the dried layer was washed with tap water, six mil (about 153 microns) vias were clearly resolved. In subsequent tests, it was found that the use of additional plasticizer in the underlying polymer layer resulted in further improved resolution.
  • the diffusion patterning process it is preferred to carry out the diffusion patterning process to fabricate a partition wall (ridge) in the plasma display apparatus as described in Examples 2-3. Nevertheless, it can be carried out by other methods, for example by overprinting an aqueous developable polymer with a water immiscible plasticizer to protect the areas underneath, then removing the unplasticized material by aqueous solubilization.
  • a method of making a plasma display apparatus which comprises the steps of forming a plurality of first electrodes on one of a plurality of dielectric substrates to extend in one direction; forming a plurality of second electrodes on the other substrate to extend in another direction perpendicular to said one direction; forming a ridge on at least one of said substrates to define a plurality of pixel areas; and providing a fluorescent material in said pixel areas, the improvement in which a relief corresponding to said ridge is fabricated by the steps of: providing a plurality of dielectric layers on the substrates so that at least one surface of an unpatterned first dielectric layer of a dielectric composition comprising an organic polymer comes in contact with a patterned second dielectric layer of a dielectric composition comprising an organic polymer, a solvent and a dispersibility changing agent, thereby forming an assembly; partially drying the assembly under a certain heating condition to diffuse a desired pattern from the surface of the second dielectric layer containing the dispersibility changing agent into the interior of the first dielectric layer;
  • a method as defined above wherein the assembly is formed by providing the first dielectric unpatterned layer on the substrate and thereon the second dielectric patterned layer.
  • a method as defined above wherein the assembly is formed by providing the second dielectric patterned layer on the substrate and thereon the first dielectric unpatterned layer.
  • the dispersibility changing agent is a material which functions as a dispersant for the organic polymer contained in the first dielectric layer and has a higher boiling point than the solvent.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Manufacturing & Machinery (AREA)
  • Gas-Filled Discharge Tubes (AREA)
EP96112109A 1993-02-26 1993-08-19 Verfahren zur Herstellung eines Plasma-Anzeigegeräts Withdrawn EP0742572A2 (de)

Applications Claiming Priority (3)

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JP38136/93 1993-02-26
JP3813693 1993-02-26
EP93113250A EP0613166B1 (de) 1993-02-26 1993-08-19 Verfahren zur Herstellung eines Plasma-Anzeigegeräts

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EP93113250.0 Division 1993-08-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998043268A1 (en) * 1997-03-25 1998-10-01 E.I. Du Pont De Nemours And Company Field emitter cathode backplate structures for display panels

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100248206B1 (ko) * 1997-06-25 2000-03-15 김영환 플라즈마 디스플레이 패널의 제조방법
KR100504397B1 (ko) * 1997-12-30 2005-09-26 엘지전자 주식회사 플라즈마 디스플레이 패널

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0382260A2 (de) * 1989-02-10 1990-08-16 Dai Nippon Insatsu Kabushiki Kaisha Plasma-Anzeigetafel und Herstellungsverfahren derselben
WO1991006118A1 (en) * 1989-10-20 1991-05-02 E.I. Du Pont De Nemours And Company Non-photographic method for patterning organic polymer films
FR2668634A1 (fr) * 1990-10-31 1992-04-30 Samsung Electronic Devices Panneau d'affichage a plasma et son procede de fabrication.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0382260A2 (de) * 1989-02-10 1990-08-16 Dai Nippon Insatsu Kabushiki Kaisha Plasma-Anzeigetafel und Herstellungsverfahren derselben
WO1991006118A1 (en) * 1989-10-20 1991-05-02 E.I. Du Pont De Nemours And Company Non-photographic method for patterning organic polymer films
FR2668634A1 (fr) * 1990-10-31 1992-04-30 Samsung Electronic Devices Panneau d'affichage a plasma et son procede de fabrication.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998043268A1 (en) * 1997-03-25 1998-10-01 E.I. Du Pont De Nemours And Company Field emitter cathode backplate structures for display panels
KR100609365B1 (ko) * 1997-03-25 2006-08-09 이 아이 듀폰 디 네모아 앤드 캄파니 디스플레이 패널용 필드 이미터 캐소드 배면판 구조물
US7101243B2 (en) 1997-03-25 2006-09-05 E. I. Du Pont De Nemours And Company Field emitter cathode backplate structures for display panels

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TW223693B (en) 1994-05-11
DE69328418T2 (de) 2001-01-04
EP0742572A3 (de) 1996-12-04
DE69328418D1 (de) 2000-05-25
KR940020872A (ko) 1994-09-16
KR970004905B1 (ko) 1997-04-08

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