EP1017083A1 - Panneau d'affichage à plasma ayant une structure poreuse - Google Patents

Panneau d'affichage à plasma ayant une structure poreuse Download PDF

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Publication number
EP1017083A1
EP1017083A1 EP99403033A EP99403033A EP1017083A1 EP 1017083 A1 EP1017083 A1 EP 1017083A1 EP 99403033 A EP99403033 A EP 99403033A EP 99403033 A EP99403033 A EP 99403033A EP 1017083 A1 EP1017083 A1 EP 1017083A1
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EP
European Patent Office
Prior art keywords
layer
barriers
panel according
hardening agent
plate
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.)
Ceased
Application number
EP99403033A
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German (de)
English (en)
Inventor
Yvan Raverdy
Guy Baret
Pierre-Paul Jobert
Agide Moi
Serge Salavin
Jean-Yves Brun
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Thomson Plasma SAS
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Thomson Plasma SAS
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Publication date
Priority claimed from FR9816094A external-priority patent/FR2787631A1/fr
Priority claimed from FR9816093A external-priority patent/FR2787630B1/fr
Priority claimed from FR9908629A external-priority patent/FR2787632B1/fr
Application filed by Thomson Plasma SAS filed Critical Thomson Plasma SAS
Publication of EP1017083A1 publication Critical patent/EP1017083A1/fr
Ceased 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
    • H01J11/12—AC-PDPs with at least one main electrode being out of contact with the plasma with main electrodes provided on both sides 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
    • H01J11/52—Means for absorbing or adsorbing the gas mixture, e.g. by gettering
    • 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
    • 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
    • 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
    • H01J9/38—Exhausting, degassing, filling, or cleaning vessels
    • H01J9/39—Degassing vessels

Definitions

  • the present invention relates to plasma display panels (PDPs). More particularly, the invention relates to PDPs having at least one constituent layer whose structure is porous.
  • Plasma display panels are flat display screens in which the displayed image consists of a set of luminous discharge points.
  • the luminous discharges are produced in a gas contained between two insulating plates.
  • Each discharge point is generated by a discharge cell defined by a point of intersection in arrays of electrodes carried by at least one of the plates.
  • a PDP comprises a two-dimensional matrix of cells, which is organized in rows and columns copied from the geometry of the electrode arrays.
  • Relief elements called barriers, may be placed so as to separate the cell rows or the cell columns. In some panels, the barriers may also separate both the cell rows and the cell columns, thus forming a grid pattern of the latter.
  • the barriers have several functions. By partitioning the space of each cell, at least in the direction of the rows or the columns, the barriers prevent a discharge in one cell causing undesirable discharges in adjacent cells by an ionization effect. They thus prevent crosstalk phenomena.
  • the barriers constitute optical screens between the adjacent cells, making it possible for the radiation emitted by each cell to be well confined in the space. This function is particularly important in colour PDPs in which the adjacent cells constitute respective elementary dots of different colours, for example in order to form triads. In this case, the barriers ensure good colour saturation.
  • the barriers often serve as a spacer between the two plates of the panel. What is exploited in this case is the fact that the barriers can have a height which corresponds to the required separation between the two plates and that they are uniformly distributed over the useful area outside the discharge points.
  • the plate not provided with barriers rests on the tops of the barriers that are present on the other plate.
  • Figures 1 and 2 illustrate an AC colour plasma display panel having a so-called coplanar structure, according to a known architecture.
  • the PDP comprises a first glass plate 2 and a second glass plate 4 a few millimetres in thickness, these being placed face to face with a separation of the order of 100 microns between the internal faces when they are joined together ( Figure 2).
  • the first plate 2 has, on its internal face, an array of parallel electrodes grouped in closely spaced pairs of electrodes Y 1a -Y 1b , Y 2a -Y 2b , ..., Y 5a -Y 5b , etc. Each pair of electrodes constitutes a display row of the panel.
  • the electrodes are embedded in a thick layer of dielectric material 6, for example glass, which covers the entire useful area of the plate 2. This layer 6 is itself covered with a thin layer 8 (less than 1 micron in thickness) of another dielectric material, in this case magnesium oxide (MgO), the surface of which is exposed to the discharge gas.
  • MgO magnesium oxide
  • the internal surface of the first plate 2 may, for example, be provided with a contrast-improving matrix 10.
  • the said matrix consists of a mosaic of elementary colour filters surrounded by generally black rings.
  • the second plate 4 has, on its internal face, an array of uniformly spaced parallel electrodes X 1 , X 2 , ..., X 6 , etc., perpendicular to the row electrodes Y 1a -Y 1b , Y 2a -Y 2b , ..., Y 5a -Y 5b , etc., which constitutes the address electrodes of the plasma display panel.
  • these electrodes X 1 , X 2 , ..., X 6 , etc. are embedded in a thick dielectric layer 12 which is itself covered with a thin layer of magnesium oxide 14.
  • a discharge cell of the PDP is thus formed by the intersection of an address electrode X 1 , X 2 , ..., X 6 , etc. with a pair of electrodes Y 1a -Y 1b , Y 2a -Y 2b , ..., Y 5a -Y 5b , etc. of a display row.
  • an AC voltage called a sustain voltage
  • the discharges are produced on the surface between these electrodes according to a voltage signal applied to the address electrode, using well-known multiplexing techniques.
  • Straight barriers 16 are placed on the thin layer 14 of the second plate 4 at each place between adjacent address electrodes X 1 , X 2 , ..., X 6 , etc. and parallel with the latter.
  • the barriers 16 have walls perpendicular to the surface of the plate 4 and a flat top serving as a bearing surface for the internal face of the first plate 2.
  • the barriers may be of trapezoidal cross section so as to improve the luminous intensity. They thus partition the discharge cells in the direction perpendicular to the address electrodes X 1 , X 2 , ..., X 5 , etc. and serve at the same time as a carrier structure for the spacing of the two plates 2, 4.
  • the barriers 16 have a height of the order of 100 microns and a pitch of 220 microns for a 50 micron width.
  • Phosphors 18R, 18G, 18B are placed in stripes on the exposed surface of the second plate 4.
  • a phosphor stripe covers one surface portion of the thin magnesium oxide layer 14 bordered between two adjacent barriers 16. It also covers the perpendicular walls of the two barriers 16 which are turned towards this surface portion.
  • Each phosphor stripe 18R, 18G, 18B has its own elementary emission colour among red, green and blue in response to a luminous discharge (generally in the ultraviolet) received from a cell. Together, the phosphors constitute a repeat pattern of three successive stripes each having a different emission colour so that a succession of elementary colour triads are created in the direction of the address electrodes, X 1 , X 2 , ..., X 5 , etc.
  • the two plates 2 and 4 are sealed together and the space that they contain is filled with the discharge gas at a low pressure, after vacuum pumping through a stem.
  • the presence of the layers of dielectric material 6, 8 and 12, 14 on top of the electrodes Y 1a -Y 1b , Y 2a -Y 2b , ..., Y 5a -Y 5b and X 1 , X 2 , ..., X 5 , etc. is characteristic of AC PDPs.
  • the dielectric material forms with the electrodes a capacitor across which is applied, in the gas, the voltages necessary to generate and sustain the luminous discharges.
  • AC PDPs AC sustain voltage automatically fixes the state of a luminous discharge point from the last command received, namely either the luminous discharge is maintained or it remains absent, depending on the command previously transmitted. This thus results in an inherent image memory effect, hence the possibility of addressing the points only when their luminous state has to change.
  • FIG 3 shows another example of an AC PDP, this time with a matrix structure.
  • This type of PDP differs from coplanar panels essentially by the fact that the discharges are produced between the respective surfaces of the two facing plates 2 and 4.
  • the PDP comprises a first plate 2 and a second plate 4, each provided with an array of mutually parallel electrodes Y 1 , Y 2 , Y 3 , ..., Y 7 , etc. and X 1 , X 2 , X 3 , ..., X 7 , etc. which are embedded in a thick layer of dielectric 6 and 12, this layer itself being covered with a thin layer of magnesium oxide 8 and 14.
  • the pitch between the electrodes is in the order of 0.5 mm.
  • the array carried by the first plate 2 constitutes the row of electrodes Y 1 , Y 2 , Y 3 , ..., Y 7 , etc., each display row being associated with a single electrode.
  • the array carried by the second plate 4 constitutes the column electrodes X 1 , X 2 , X 3 , ..., X 7 , etc., these being placed so as to be perpendicular to the row electrodes.
  • the second plate 4 also includes a system of barriers 16 in the form of a thick layer (of the order of 100 microns in thickness) in which wells 20 are formed.
  • the wells 20 pass right through the thickness of the layer which constitutes the system of barriers 16 and thus expose the thin MgO layer 14.
  • the first plate 2 bears on the layer of barriers 16 via balls 17.
  • the wells 20 are distributed in a staggered pattern and are centred on crossover points between the row electrodes Y 1 , Y 2 , Y 3 , ..., Y 7 , etc. and the column electrodes X 1 , X 2 , X 3 , ..., X 7 , etc.
  • two adjacent row electrodes Y2i and Y2i+1 form a pair and receive the same electrical signal.
  • the wells 20 have a circular cross section of average diameter of the order of 0.5 mm.
  • Each well 20 forms a discharge cell with the crossover of the row electrode and the column electrode with which it is associated.
  • the staggered distribution of the wells 20 means that, along each row electrode Y 1 , Y 2 , Y 3 , ..., Y 7 , etc. there is, in succession, one discharge cell per two points of crossover with the column electrodes X 1 , X 2 , X 3 , ..., X 7 , etc. Likewise, along each column electrode there is, in succession, one discharge cell per two points of crossover with the row electrodes. Thus, 50% of the electrode crossover points on the plate assembly constitute discharge points. According to another construction, it is known to use zigzag electrodes, and in this case half the number of electrodes are used.
  • Each luminous discharge therefore is produced within a well 20 between the respective exposed MgO layers 8 and 14 of the two plates 2 and 4.
  • the discharge cells are thus perfectly partitioned both in the row direction and in the column direction.
  • phosphors are introduced into the wells 20, each well having a phosphor of primary emission colour different from that of the adjacent wells so as to produce elementary triads in a repeat pattern.
  • the phosphors occupy an annular volume in their wells 20, the central space being left clear in order to create the luminous discharges.
  • the system of barriers 16 having staggered wells 20 occupies a large part (40 to 60%) of the total area of the second plate 4. It thus allows a strong and stable carrier structure for receiving the spacer balls supporting the first plate 2 to be readily produced.
  • United States Patent No. 4,037,130 teaches those skilled in the art that in order to obtain optimized barriers it is preferable for these to be porous.
  • the porosity of the barriers is combined with a gettering effect of the material of which the barriers are composed, in order to remove any parasitic gases that may remain in the panel after pumping.
  • the gettering effect is a surface absorption property specific to certain materials which can trap certain molecules on their surface.
  • the combination of the gettering effect with the porosity of the material used means that the risk of obtaining a defect due to the outgassing of the materials is almost zero. It is also possible in a plasma display panel to deposit a layer of a gettering material other than the barrier layer.
  • the layer must be made of a hardened material. This is also necessitated when the layer is a layer of barriers intended to be bearing barriers.
  • the force exerted per unit area of barrier may be as much as 10 6 pascals (approximately 10 kg/cm 2 ) depending on the ratio of the bearing area of the barriers to the total area of the panel.
  • the barriers 16 like those described with reference to Figures 1 to 3 for example, includes an hardening agent, generally a glassy phase, which is sufficiently crush-resistant to maintain a constant space between the two plates.
  • barriers are produced, for example, by the screen printing (in 10 to 20 successive layers) of a paste containing a glass frit or by the sand blasting of a layer containing a glass frit.
  • these layers are fired at temperatures of between 450 and 600°C so as to solidify the hardening agent and make the layer comprising it mechanically strong.
  • the invention aims to improve the effects of the barrier layers as well as any layers of gettering material by increasing their porosity so as to eliminate any undesirable outgassing problem after vacuum pumping.
  • the subject of the invention is a plasma display panel consisting of two facing plates enclosing a discharge space comprising an array of discharge cells, the said panel including a layer of a material which contains less than 10% of a hardening agent.
  • the layer in question is either a barrier layer or, more generally, a layer of a gettering material.
  • the panel includes a layer of barriers defining staggered wells, the barriers extending from one plate to the other.
  • the barriers may be sufficiently porous to allow pumping through the barrier layer.
  • the use of a structure consisting of bearing barriers with staggered wells furthermore makes it possible to have a large bearing area, allowing the content of hardening agent to be reduced. It is possible to use a layer containing less than 4% of hardening agent. According to one particular embodiment, no hardening agent is used.
  • the structure comprising staggered wells and bearing barriers no longer uses balls. It is possible to make use of spacers produced above the barriers, or on the opposite plate, made of the same type of material. Such a technique makes it possible, in particular, to improve the production efficiency by eliminating defects due to the balls rolling while the plates are being joined together.
  • the barriers since the barriers contain little hardening agent they have a relatively low density, thereby conferring on them a capacity of undergoing localized compaction when stressed. This characteristic is advantageous when the barriers are bearing barriers. In this case, the plate bearing on the tops of the barriers will level out all the overthicknesses formed during the vacuum treatment (vacuum-pumping cycle), by localized densification of the material.
  • the relatively rigid barriers used in the prior art must either be dressed or be produced in a process which gives very good height uniformity. This is because any height non-uniformity causes a variation in the spacing between the plates if the barrier is quite solid or causes the barriers to shatter, which may damage the phosphor coatings.
  • the barriers according to the present invention are preferably composed of a material containing a mineral filler in the form of powder.
  • the mean elementary diameter of the powder particles preferably lies within the 1 to 20 micron range, and even more preferably the 5 to 8 micron range.
  • a preferred threshold corresponds to a filler consisting of a powder 90% of the mass of which has a particle size such that the particle diameter is greater than 2 microns.
  • such a compressive strength is sufficient to allow the production of bearing barriers if the latter cover one quarter or more of the area of the panel. This is especially the case for a system of barriers with staggered wells.
  • the layer includes a filler composed of at least one oxide from among: aluminates, alumina, yttrium oxide, yttrium borate, clays, calcium oxide, magnesium oxide, titanium oxide, zirconium oxide or silica.
  • a filler composed of at least one oxide from among: aluminates, alumina, yttrium oxide, yttrium borate, clays, calcium oxide, magnesium oxide, titanium oxide, zirconium oxide or silica.
  • a filler composed of at least one oxide from among: aluminates, alumina, yttrium oxide, yttrium borate, clays, calcium oxide, magnesium oxide, titanium oxide, zirconium oxide or silica. The choice of one or more of these oxides will depend on the gettering effects specific to the materials.
  • the hardening agent may be a glass, such as a lead or bismuth borosilicate, having a softening temperature below the temperature of the heat treatment or treatments undergone subsequently in the process (lying between 380 and 500°C).
  • the hardening agent may also be a silicate, such as sodium silicate, potassium silicate or lithium silicate, etc., or a phosphate, or a carbonate, or a glass based on an oxide of tellurium of silver and vanadium, or else potassium dichromate.
  • a silicate such as sodium silicate, potassium silicate or lithium silicate, etc.
  • a phosphate or a carbonate
  • a glass based on an oxide of tellurium of silver and vanadium or else potassium dichromate.
  • the hardening agent softens or melts and binds the filler particles together, forming bridgings, without creating closed porosity.
  • the filler particles are bonded together.
  • the invention allows all the techniques conventionally used for producing the barriers, such as screen printing, sand blasting, photolithography, etc.
  • a first example of the process is based on the manufacture of a plasma display panel as described with reference to Figures 1 and 2, having a useful area 106 cm in diagonal, with a TV resolution (560 rows, 700 columns).
  • the barriers 16 are produced on the plate 4 having the address electrodes X 1 , X 2 , ..., X 5 , etc. They have a pitch of 400 microns, a width of 100 microns and a height of 180 microns.
  • the operations start on the plate 4 which has been provided beforehand with the array of address electrodes X 1 , X 2 , ..., X 5 , etc., with the thick layer of dielectric 12 and with the thin layer of magnesium oxide 14 using conventional techniques.
  • the barriers 16 are produced by the photolithography of a pasty layer 16' deposited by screen printing on the thin MgO layer 14.
  • the composition of the paste forming the layer is as follows:
  • the paste 16' is spread uniformly over the MgO layer 14 through a screen-printing mask 24 having an aperture corresponding to the aspect ratio of the useful area of the plate ( Figure 4a).
  • the layer of paste 16' has a thickness of the order of 30 microns.
  • a photolithography mask 26 is placed on the layer of paste 16'.
  • the mask has a pattern of long thin apertures, this pattern being copied from the pattern of barriers to be printed on the MgO layer 14. Those parts of the layer which are revealed through the mask are exposed to ultraviolet radiation so as to make them development-resistant ( Figure 4b).
  • the layer 16' thus exposed is developed in water or in water to which sodium carbonate has been added, depending on the type of resin used, and the surface is then dried with the aid of an air knife.
  • a first layer of barrier material 16' is therefore obtained with an elementary height of 30 microns.
  • the vertical positioning of the screen-printing mask 26 or the depth of the latter are modified in order to take into account the growth in the deposited layers existing on the plate.
  • the phosphor layers are deposited using screen-printing and photolithography techniques similar to those used for producing the barriers 16. A separate process is used for the three phosphors of different emission colour.
  • a paste composed of a phosphor filler and a photosensitive resin in a volume ratio of 1:1 is prepared. This paste is deposited uniformly by screen printing on the useful area of the plate in order to form a layer sufficiently thick to embed the barriers.
  • the photolithography mask has a pattern of cutouts which is copied from the areas that have to be covered by the phosphor stripes.
  • the pattern is fired at 420°C for one hour in order to burn off the organic part.
  • the glass frit melts and binds together the alumina powder, forming bridgings between the particles.
  • the porosity of the barriers thus remains high and completely open.
  • the two plates 2 and 4 are then brought together, by resting the first plate 2 on the tops of the barriers 16 of the second plate 4. Next, the space contained between the two plates is sealed and this space is vacuum pumped through a stem.
  • the vacuum pumping is carried out at a temperature of 350°C for 30 minutes only.
  • the alumina filler may be replaced with another oxide, such as yttrium oxide, silica, titanium oxide or zirconium oxide. It is also possible to produce the barriers using a filler other than an oxide. It is also possible to replace the lead borosilicate with a bismuth borosilicate or any other glass having a sufficiently low softening temperature.
  • the PDP of the first example is produced by using the same processes, but by replacing the lead borosilicate of the paste composition with an equivalent amount of sodium silicate.
  • the sodium silicate also has the effect of forming bridgings between the particles during the firing step.
  • the barriers thus formed also have a high and completely open porosity.
  • silicates potassium silicate, lithium silicate, etc.
  • silicates with certain phosphates, such as aluminium phosphate or another phosphate, a potassium dichromate, or with carbonates. More generally, another glassy phase having a low softening temperature, that is to say between 300 and 500°C, may be used.
  • a system of barriers having completely open porosity is produced in the manufacture of a PDP having a staggered configuration of wells 20, as illustrated in Figures 5a to 5g and 6.
  • Figures 5a to 5g have been simplified for the sake of clarity and it goes without saying that the plates 2 and 4 illustrated also include electrodes Xi and Yi, dielectric layers 6 and 12 and thin oxide layers 8 and 14 which have not been illustrated.
  • Figures 5a to 5g correspond to a view in the plane of section A-A shown in Figure 6.
  • the system of barriers 16 occupies more than 40% of the area in mount with the front plate 2.
  • the force per unit area (pressure) exerted by the plates on the barriers during vacuum pumping and [sic] therefore approximately 50% less than with the PDP of the first example.
  • This lower pressure allows a material without a hardening agent to be used for the barriers.
  • a mineral filler consisting of alumina powder having a narrow particle size distribution and a mean elementary diameter of between 5 and 8 microns is used for the barriers. Such a particle size gives the deposited layer good cohesion.
  • the alumina powder is mixed with a photosensitive resin in a ratio of 1:1 in order to form a paste.
  • the paste is deposited uniformly on the layer of magnesium oxide (not illustrated) of the second plate 4 through a first screen-printing mask 24, as in the first example (cf. Figure 4a).
  • a first photolithography mask 26 having a pattern matching the surface of the system of barriers to be formed is applied on the layer of paste 16' (cf. Figure 5a).
  • the steps of exposure to ultraviolet radiation and of development are then carried out under the conditions of the first example (cf. Figures 4b and 4c) in order to obtain a first barrier layer in a pattern.
  • the first layer has circular apertures approximately 300 ⁇ m in diameter (cf. Figure 5b).
  • a 40 ⁇ m first layer is produced in a single step.
  • the screen-printing paste deposition and exposure steps are repeated using a mask whose patterns produce holes of increasing diameter and of development. For example, three successive layers 16' 40 ⁇ m in thickness are produced, each layer having circular apertures with a diameter greater than the lower layer, the top layer having circular apertures approximately 500 ⁇ m in diameter (cf. Figure 5c). After successively depositing these layers, a barrier 16 with wells 20 arranged in a staggered fashion is obtained.
  • a layer 19' of photosensitive alumina paste is then deposited.
  • the layer 19' is exposed to UV with the aid of a mask 27 which defines broad mounts 19, for example having a diameter of 370 ⁇ m, on the top of the barrier 16 (cf. Figure 5d). If the barriers are not made of alumina, the same material as the barriers is preferably used for producing the layer 19'.
  • the phosphors are deposited in the wells 20 formed by the system of barriers 16 by screen-printing steps, thus producing wells 20R, 20G and 20B in a shape of truncated cone.
  • the shape of truncated cone has the advantage of giving high luminosity.
  • a heat treatment for burning off the organic binders of the layers 16' and 19' is carried out at a temperature of 400 to 500°C for 0.5 to 1 hour.
  • the two plates are sealed and vacuum-pumping is carried out through a stem at a temperature of 350°C for a period of 30 minutes only.
  • Tests demonstrate that the system of barriers 16 has sufficient mechanical strength to fulfil the spacing function which can withstand the pressures of the order of 3 to 5 ⁇ 10 5 pascals (approximately 3 to 5 kg/cm 2 ).
  • Another variant consists in using a hardening agent at a very low level, such as potassium dichromate, in order to be able to produce barriers and mount smaller in size.
  • a hardening agent at a very low level, such as potassium dichromate
  • a paste which contains, by mass, 49% alumina, 49% polyvinyl alcohol and 2% potassium dichromate, which also acts as a photosensitizer for the polyvinyl alcohol used as photosensitive resin.
  • a system of barrier having completely open porosity and having staggered wells 20 is produced as illustrated in Figure 7.
  • This fourth example is explained with the aid of Figures 8a to 8e which correspond to a view on the section B-B shown in Figure 7.
  • Figures 8a to 8e are not to scale for representational reasons.
  • Such a staggered structure corresponds to pixels that are wider than they are tall.
  • the elementary cells have a diameter of approximately 400 ⁇ m and are horizontally spaced by 400 ⁇ m.
  • the rows of cells are vertically spaced by 465 ⁇ m.
  • Mounts 19 having a diameter of 370 ⁇ m are placed between the cells.
  • the structure of this fourth example has the feature of having an upper barrier area of greater than 66% but a bearing area of the order of 29%.
  • a barrier hardness is used that varies according to the barrier layers 16 or spacer layers 19.
  • a layer 19' of a photosensitive alumina paste is deposited on the front plate 2, this paste being composed, for example, of 47% alumina powder having a narrow particle size distribution, the diameter of the particles of which is between 5 and 8 ⁇ m, 5% hardening agent, for example lead borosilicate, and 48% photosensitive resin.
  • the thickness of the deposited layer is, for example, 50 ⁇ m.
  • the layer 19' is then developed in water so as to obtain broad mounts 19 which are fired at a temperature of approximately 400°C for approximately 30 min.
  • a barrier structure 16 made of several layers 16' is produced on the rear plate 4 as explained in the case of the third example.
  • the diameter of the wells 20 varies, for example, from 200 ⁇ m to 400 ⁇ m in three layers 16', each having a thickness, for example, of 40 ⁇ m.
  • the lower layers 16' are produced without a hardening agent using a paste containing 50% alumina and 50% photosensitive resin whereas the top layer 16' is produced from a paste containing 48% alumina, 3% hardening agent and 49% photosensitive resin.
  • the hardening agent employed is preferably the same as the hardening agent employed for the layer 19'.
  • the phosphors are deposited in order to produce the various elementary cells 20R, 20G and 20B.
  • the whole assembly is fired at approximately 400°C for approximately 30 min. as indicated in Figure 8d.
  • Vacuum pumping is then carried out for a period of 30 min. at a temperature of 350°C.
  • the alumina may be partly or completely replaced with different materials whose properties are similar.
  • Alumina has the advantage of having a large gettering effect with respect to water and CO 2 .
  • those skilled in the art may replace the alumina with calcium oxide or an aluminate whose gettering effects are equivalent.
  • the troublesome gases are water, carbon monoxide and carbon dioxide. Oxygen may also degas, but it is less troublesome for the operation of the panel.
  • alumina As material having a gettering effect with respect to water, it is possible to use, as required, alumina, aluminates, clays, or calcium, magnesium or yttrium oxides, silica, or silicates.
  • alumina As material having a gettering effect with respect to CO and CO 2 , it is possible to use, as required, alumina, aluminates, clays, or calcium or magnesium oxides.
  • Titanium oxide and yttrium oxide have a gettering effect with respect to oxygen. It is possible to mix the various materials, reduced to powder, so as to combine the various gettering effects.
  • a material having a high secondary emission coefficient is used in the filler in order to improve the light efficiency.
  • yttrium-based oxides or yttrium borate are preferred.
  • a layer of one or more gettering materials is deposited inside the panel so as to trap any undesirable residual gases.
  • a layer may be deposited under the phosphors or around the perimeter of the image area. The function of this layer then becomes independent of its structure.
  • Figure 9 illustrates a plasma display panel 30 seen from the front and from the side.
  • the panel 30 has an image area 31 whose diagonal is, for example, 42 inches, i.e. approximately 106 cm. Illustrated by the dotted lines are absorption regions 32 which are arranged around the perimeter of the image area 31 but said regions 32 share the same confined space between the two plates 2 and 4.
  • the absorption regions 32 have, for example, a width of one centimetre.
  • the layer of gettering material forming the absorption region 32 preferably has a high porosity so as to increase the useful surface area for gettering. However, if the risks of outgassing are low, especially because porous barriers are used, it is possible to use a layer of material having low porosity for the absorption regions.
  • Such a variant may also be applied in panels which do not use a porous barrier structure. In this case, it is even recommended to produce absorption regions 32 in order to compensate for the greater outgassing than with porous structures.
  • Such a layer is produced in the same way as a barrier layer is deposited according to one of the preceding examples.
EP99403033A 1998-12-21 1999-12-06 Panneau d'affichage à plasma ayant une structure poreuse Ceased EP1017083A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
FR9816094A FR2787631A1 (fr) 1998-12-21 1998-12-21 Procede de fabrication d'un panneau a plasma
FR9816093 1998-12-21
FR9816094 1998-12-21
FR9816093A FR2787630B1 (fr) 1998-12-21 1998-12-21 Procede de fabrication d'un panneau a plasma et panneau a plasma comportant des barrieres
FR9908629 1999-07-05
FR9908629A FR2787632B1 (fr) 1998-12-21 1999-07-05 Procede de fabrication d'un panneau d'affichage au plasma et panneau d'affichage au plasma realise par ledit procede

Publications (1)

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EP1017083A1 true EP1017083A1 (fr) 2000-07-05

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US (1) US6483238B1 (fr)
EP (1) EP1017083A1 (fr)
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EP1290711A2 (fr) * 2000-06-16 2003-03-12 E.I. Du Pont De Nemours And Company Procede de formation de structures barriere sur un substrat et article produit selon ledit procede
WO2004066336A1 (fr) * 2003-01-21 2004-08-05 Matsushita Electric Industrial Co., Ltd. Procede de fabrication d'ecrans plasma

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US7438829B2 (en) * 2003-11-13 2008-10-21 E.I. Du Pont De Nemours And Company Thick film getter paste compositions for use in moisture control
JP4863329B2 (ja) * 2004-01-26 2012-01-25 双葉電子工業株式会社 蛍光表示管
ITMI20041443A1 (it) * 2004-07-19 2004-10-19 Getters Spa Processo per la produzione di schermi al plasma con materiale getter distribuito e schermi cosi'ottenuti
KR100638211B1 (ko) * 2004-11-09 2006-10-26 엘지전자 주식회사 플라즈마 디스플레이 패널
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EP1290711A2 (fr) * 2000-06-16 2003-03-12 E.I. Du Pont De Nemours And Company Procede de formation de structures barriere sur un substrat et article produit selon ledit procede
EP1290711A4 (fr) * 2000-06-16 2007-05-23 Du Pont Procede de formation de structures barriere sur un substrat et article produit selon ledit procede
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