WO2009130874A1 - プラズマディスプレイパネル - Google Patents
プラズマディスプレイパネル Download PDFInfo
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- WO2009130874A1 WO2009130874A1 PCT/JP2009/001788 JP2009001788W WO2009130874A1 WO 2009130874 A1 WO2009130874 A1 WO 2009130874A1 JP 2009001788 W JP2009001788 W JP 2009001788W WO 2009130874 A1 WO2009130874 A1 WO 2009130874A1
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- WIPO (PCT)
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- dielectric layer
- layer
- pdp
- protective layer
- oxide
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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
- H01J11/20—Constructional details
- H01J11/52—Means for absorbing or adsorbing the gas mixture, e.g. by gettering
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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
- H01J11/20—Constructional details
- H01J11/34—Vessels, containers or parts thereof, e.g. substrates
- H01J11/40—Layers for protecting or enhancing the electron emission, e.g. MgO layers
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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
Definitions
- the present invention relates to a plasma display panel used for a display device or the like.
- Plasma display panels (hereinafter referred to as PDPs) are capable of realizing high definition and large screens, so 65-inch televisions have been commercialized.
- PDP has been applied to high-definition televisions having more than twice the number of scanning lines as compared with the conventional NTSC system, and PDP containing no lead component is required in consideration of environmental problems.
- the PDP is basically composed of a front plate and a back plate.
- the front plate is composed of a glass substrate, display electrodes, a dielectric layer, and a protective layer.
- the glass substrate is sodium borosilicate glass by a float process.
- the display electrode is composed of a striped transparent electrode and a bus electrode formed on one main surface of the glass substrate.
- the dielectric layer covers the display electrode and functions as a capacitor.
- the protective layer is made of magnesium oxide (MgO) formed on the dielectric layer.
- the back plate is a glass substrate, stripe-shaped address electrodes formed on one main surface thereof, a base dielectric layer covering the address electrodes, a partition formed on the base dielectric layer, It is comprised with the fluorescent substance layer which light-emits each of red, green, and blue formed between the partition walls.
- the front plate and the back plate are hermetically sealed with their electrode forming surfaces facing each other, and Ne—Xe discharge gas is sealed at a pressure of 400 Torr to 600 Torr in a discharge space partitioned by a partition wall.
- the PDP discharges by selectively applying a video signal voltage to the display electrodes, and the ultraviolet rays generated by the discharge excite each color phosphor layer to emit red, green, and blue light, thereby realizing color image display. (See Patent Document 1).
- the protective layer In the PDP, attempts have been made to improve the electron emission characteristics by mixing impurities in the protective layer.
- impurities are mixed in the protective layer to improve the electron emission characteristics
- charges are accumulated on the surface of the protective layer at the same time, and the decay rate at which the charge decreases as time goes by as a memory function increases. End up. Therefore, it is necessary to take measures such as increasing the applied voltage to suppress this.
- the protective layer must have a high electron emission ability and a low charge decay rate as a memory function, that is, a high charge retention characteristic. There are challenges.
- the plasma display panel is arranged so that a dielectric layer is formed so as to cover the display electrodes formed on the substrate and a protective layer is formed on the dielectric layer, and a front plate is formed so as to form a discharge space.
- an address electrode is formed in a direction intersecting with the display electrode, and a partition wall for partitioning a discharge space and a back plate provided with a phosphor layer are provided.
- the protective layer is formed by forming a base film on the dielectric layer and attaching aggregated particles obtained by aggregating a plurality of crystal particles made of metal oxide to the base film.
- a hydrogen storage material is disposed in the discharge space between the front plate and the back plate.
- FIG. 1 is a perspective view showing the structure of a PDP according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view showing the structure of the front plate of the PDP in the embodiment of the present invention.
- FIG. 3 is a cross-sectional view showing the configuration of the back plate of the PDP in the embodiment of the present invention.
- FIG. 4 is an explanatory view showing, in an enlarged manner, the protective layer portion of the PDP in the embodiment of the present invention.
- FIG. 5 is an enlarged view for explaining aggregated particles in the protective layer of the PDP in the embodiment of the present invention.
- FIG. 6 is a characteristic diagram showing the results of cathodoluminescence measurement of crystal particles.
- FIG. 7 is a characteristic diagram showing the examination results of the electron emission characteristics and the Vscn lighting voltage in the PDP in the experimental results conducted to explain the effects of the present invention.
- FIG. 8 is a characteristic diagram showing the relationship between the crystal grain size and the electron emission characteristics.
- FIG. 9 is a characteristic diagram showing the relationship between the grain size of crystal grains and the incidence of partition wall breakage.
- FIG. 10 is a characteristic diagram showing an example of the particle size distribution of the aggregated particles in the PDP according to the present invention.
- FIG. 11 is a characteristic diagram showing the results of experiments conducted to explain the effect of the hydrogen storage material according to the present invention.
- FIG. 12 is a sectional view showing the structure of another example of the back plate of the PDP according to the present invention.
- FIG. 13 is a sectional view showing the structure of another example of the front plate of the PDP according to the present invention.
- FIG. 14 is a diagram illustrating steps for forming a protective layer in the method for manufacturing a PDP according to the present
- the protective layer formed on the dielectric layer of the front plate protects the dielectric layer from ion bombardment due to discharge, emits initial electrons for generating address discharge, and the like. can give.
- Protecting the dielectric layer from ion bombardment plays an important role in preventing an increase in discharge voltage, and emitting initial electrons for generating an address discharge is an address discharge error that causes image flickering. It is an important role to prevent.
- the present invention has been made in view of such a problem, and can realize a PDP having a high-definition and high-luminance display performance and low power consumption and a long life.
- FIG. 1 is a perspective view showing the structure of a PDP in an embodiment of the present invention.
- the basic structure of the PDP is the same as that of a general AC surface discharge type PDP.
- the PDP 1 has a front plate 2 made of a front glass substrate 3 and a back plate 10 made of a back glass substrate 11 facing each other, and its outer peripheral portion is sealed with a glass frit or the like.
- the material is hermetically sealed.
- the discharge space 16 inside the sealed PDP 1 is filled with a discharge gas such as Ne and Xe at a pressure of 400 Torr to 600 Torr.
- a pair of strip-shaped display electrodes 6 each composed of a scanning electrode 4 and a sustain electrode 5 and a plurality of black stripes (light shielding layers) 7 are arranged in parallel to each other.
- a dielectric layer 8 serving as a capacitor is formed on the front glass substrate 3 so as to cover the display electrode 6 and the light shielding layer 7, and a protective layer 9 made of magnesium oxide (MgO) is formed on the surface.
- MgO magnesium oxide
- a plurality of strip-like address electrodes 12 are arranged in parallel to each other in a direction orthogonal to the scanning electrodes 4 and the sustain electrodes 5 of the front plate 2.
- Layer 13 is covering. Further, a partition wall 14 having a predetermined height is formed on the base dielectric layer 13 between the address electrodes 12 to divide the discharge space 16.
- a phosphor layer 15 that emits red, green, and blue light by ultraviolet rays is sequentially applied to the grooves between the barrier ribs 14 and formed.
- a discharge cell is formed at a position where the scan electrode 4 and the sustain electrode 5 intersect with the address electrode 12, and the discharge cell having the red, green and blue phosphor layers 15 arranged in the direction of the display electrode 6 is used for color display. Become a pixel.
- the front plate 2 and the back plate 10 having predetermined constituent members are arranged to face each other so that the scanning electrodes 4 and the address electrodes 12 are orthogonal to each other, and the periphery thereof is sealed with a glass frit, so that a discharge space is obtained.
- 16 is filled with a discharge gas containing Ne, Xe or the like, thereby completing the PDP 1.
- FIG. 2 is a cross-sectional view showing the structure of the front plate 2 of the PDP 1 in the embodiment of the present invention.
- the front glass substrate 3 manufactured by the float method or the like is placed on the scan electrode 4 and the sustain electrode.
- a display electrode 6 made of the electrode 5 and a light shielding layer 7 are patterned.
- Scan electrode 4 and sustain electrode 5 are made of transparent electrodes 4a and 5a made of indium tin oxide (ITO), tin oxide (SnO 2 ), etc., and metal bus electrodes 4b and 5b formed on transparent electrodes 4a and 5a, respectively. It is comprised by.
- the metal bus electrodes 4b and 5b are used for the purpose of imparting conductivity in the longitudinal direction of the transparent electrodes 4a and 5a, and are formed of a conductive material whose main component is a silver (Ag) material.
- the dielectric layer 8 includes a first dielectric layer 81 provided on the front glass substrate 3 so as to cover the transparent electrodes 4a and 5a, the metal bus electrodes 4b and 5b, and the light shielding layer 7, and a first dielectric.
- the second dielectric layer 82 formed on the layer 81 has at least two layers. Further, the protective layer 9 is formed on the second dielectric layer 82.
- the scan electrode 4, the sustain electrode 5, and the light shielding layer 7 are formed on the front glass substrate 3.
- the transparent electrodes 4a and 5a and the metal bus electrodes 4b and 5b are formed by patterning using a photolithography method or the like.
- the transparent electrodes 4a and 5a are formed using a thin film process or the like, and the metal bus electrodes 4b and 5b are solidified by baking a paste containing a silver (Ag) material at a desired temperature.
- the light shielding layer 7 is also formed by screen printing a paste containing a black pigment or by forming a black pigment on the entire surface of the glass substrate and then patterning and baking using a photolithography method.
- a dielectric paste layer (dielectric material layer) is formed by applying a dielectric paste on the front glass substrate 3 by a die coating method or the like so as to cover the scan electrode 4, the sustain electrode 5, and the light shielding layer 7.
- the surface of the applied dielectric paste is leveled by leaving it to stand for a predetermined time, so that a flat surface is obtained.
- the dielectric paste layer is baked and solidified to form the dielectric layer 8 that covers the scan electrode 4, the sustain electrode 5, and the light shielding layer 7.
- the dielectric paste is a paint containing a dielectric material such as glass powder, a binder and a solvent.
- a protective layer 9 made of magnesium oxide (MgO) is formed on the dielectric layer 8 by vacuum deposition.
- predetermined components scanning electrode 4, sustaining electrode 5, light shielding layer 7, dielectric layer 8, and protective layer 9) are formed on front glass substrate 3, and front plate 2 is completed.
- FIG. 3 is a cross-sectional view showing the configuration of the back plate 10 of the PDP 1 in the embodiment of the present invention.
- addressing is performed by a method in which a paste containing a silver (Ag) material is screen-printed on the rear glass substrate 11 or a method in which a metal film is formed on the entire surface and then patterned using a photolithography method.
- the address layer 12 is formed by forming a material layer as a component for the electrode 12 and firing it at a desired temperature.
- a dielectric paste is applied to the rear glass substrate 11 on which the address electrodes 12 are formed by a die coating method or the like so as to cover the address electrodes 12 to form a dielectric paste layer.
- the base dielectric layer 13 is formed by firing the dielectric paste layer.
- the dielectric paste is a paint containing a dielectric material such as glass powder, a binder and a solvent.
- a partition wall forming layer containing a partition wall material is applied on the underlying dielectric layer 13 and patterned into a predetermined shape to form a partition wall material layer, followed by firing to form the partition walls 14.
- a method of patterning the partition wall paste applied on the base dielectric layer 13 a photolithography method or a sand blast method can be used.
- the phosphor layer 15 is formed by applying a phosphor paste containing a phosphor material on the base dielectric layer 13 between the adjacent barrier ribs 14 and on the side surfaces of the barrier ribs 14 and baking it.
- a particulate hydrogen storage material 17 having a particle size of 0.1 ⁇ m or more and 20 ⁇ m or less is dispersed and attached.
- the hydrogen occluding material 17 is attached so that the covering ratio of the hydrogen occluding material 17 covering the phosphor layer 15 is 50% or less so as not to disturb the light emission of the phosphor.
- the hydrogen storage material 17 is dispersed so as to be scattered on the phosphor layer 15, but the hydrogen storage material 17 may be dispersed in the phosphor layer 15.
- the hydrogen storage material 17 for storing hydrogen includes at least one of platinum (Pt), palladium (Pd), ruthenium (Ru), rhodium (Rh), iridium (Ir), and osmium (Os). Platinum group powders can be used, but palladium is particularly desirable.
- platinum group powders can be used, but palladium is particularly desirable.
- any one or more of platinum, palladium, ruthenium, rhodium, iridium, and osmium and transition metals such as titanium (Ti), manganese (Mn), zirconium (Zr), and nickel (Ni) are used.
- a compound with any one of cobalt (Co), lanthanum (La), iron (Fe), and vanadium (V) can be used. In this case, an alloy containing palladium is also desirable.
- a spray method can be used as a method of dispersing the hydrogen storage material 17 on the phosphor layer 15.
- platinum group powder may be mixed in advance when the phosphor layer 15 is formed.
- the particle size of the platinum group powder is desirably 0.1 ⁇ m or more and 20 ⁇ m or less, and the mixing ratio is desirably 0.01% or more and 2% or less with respect to the phosphor powder. Since the phosphor layer 15 has a low filling factor of 60% or less, the effect of occluding hydrogen is maintained even if the platinum group powder is dispersed inside the phosphor layer 15.
- the dielectric material of the first dielectric layer 81 is composed of the following material composition. That is, it contains 20 wt% or more and 40 wt% or less of bismuth oxide (Bi 2 O 3 ), and 0.5 wt.% Of at least one selected from calcium oxide (CaO), strontium oxide (SrO), and barium oxide (BaO).
- MoO 3 molybdenum oxide
- WO 3 tungsten oxide
- CeO 2 cerium oxide
- MnO 2 manganese dioxide
- molybdenum oxide MoO 3
- tungsten oxide WO 3
- cerium oxide CeO 2
- manganese dioxide MnO 2
- copper oxide CuO
- chromium oxide Cr 2 O 3
- cobalt oxide At least one selected from (Co 2 O 3 ), vanadium oxide (V 2 O 7 ), and antimony oxide (Sb 2 O 3 ) may be contained in an amount of 0.1 wt% to 7 wt%.
- zinc oxide (ZnO) is 0 wt% or more and 40 wt% or less
- boron oxide (B 2 O 3 ) is 0 wt% or more and 35 wt% or less
- silicon oxide (SiO 2 ) is 0 wt%.
- the material composition which does not contain a lead component such as 0% by weight to 15% by weight and 0% by weight to 10% by weight of aluminum oxide (Al 2 O 3 ) may be included. There is no limitation in particular in content of these material compositions, and it is the content range of material composition about a prior art.
- a dielectric material powder is produced by pulverizing a dielectric material composed of these composition components with a wet jet mill or a ball mill so that the average particle diameter is 0.5 ⁇ m or more and 2.5 ⁇ m or less. Next, the dielectric material powder 55 wt% or more and 70 wt% or less and the binder component 30 wt% or more and 45 wt% or less are kneaded well with three rolls, and the first dielectric layer for die coating or printing. A paste is produced.
- the binder component is ethyl cellulose, terpineol containing 1% by weight to 20% by weight of acrylic resin, or butyl carbitol acetate.
- dioctyl phthalate, dibutyl phthalate, triphenyl phosphate and tributyl phosphate are added to the paste as needed, and glycerol monooleate, sorbitan sesquioleate, homogenol (Kao Corporation) as a dispersant.
- the printability may be improved by adding a phosphoric ester of an alkyl allyl group or the like.
- the front glass substrate 3 is printed by a die coat method or a screen printing method so as to cover the display electrode 6 and dried, and then slightly higher than the softening point of the dielectric material. Baking is performed at a temperature in the range of 575 ° C. or more and 590 ° C. or less.
- the dielectric material of the second dielectric layer 82 is composed of the following material composition. That is, bismuth oxide (Bi 2 O 3 ) is contained in an amount of 11 wt% to 20 wt%, and at least one selected from calcium oxide (CaO), strontium oxide (SrO), and barium oxide (BaO) is 1.6. It contains at least 1 wt% and no more than 21 wt%, and contains at least one selected from molybdenum oxide (MoO 3 ), tungsten oxide (WO 3 ), and cerium oxide (CeO 2 ).
- MoO 3 molybdenum oxide
- tungsten oxide WO 3
- cerium oxide CeO 2
- copper oxide CuO
- chromium oxide Cr 2 O 3
- cobalt oxide Co 2 O 3
- At least one selected from vanadium oxide (V 2 O 7 ), antimony oxide (Sb 2 O 3 ), and manganese oxide (MnO 2 ) may be contained in an amount of 0.1 wt% to 7 wt%.
- zinc oxide (ZnO) is 0 wt% or more and 40 wt% or less
- boron oxide (B 2 O 3 ) is 0 wt% or more and 35 wt% or less
- silicon oxide (SiO 2 ) is 0 wt%.
- the material composition which does not contain a lead component such as 0% by weight to 15% by weight and 0% by weight to 10% by weight of aluminum oxide (Al 2 O 3 ) may be included. There is no limitation in particular in content of these material compositions, and it is the content range of material composition about a prior art.
- a dielectric material powder is produced by pulverizing a dielectric material composed of these composition components with a wet jet mill or a ball mill so that the average particle diameter is 0.5 ⁇ m or more and 2.5 ⁇ m or less.
- the dielectric material powder 55 wt% or more and 70 wt% or less and the binder component 30 wt% or more and 45 wt% or less are well kneaded with three rolls for die coating or printing for the second dielectric layer.
- a paste is made.
- the binder component is ethyl cellulose, terpineol containing 1% by weight to 20% by weight of acrylic resin, or butyl carbitol acetate.
- dioctyl phthalate, dibutyl phthalate, triphenyl phosphate and tributyl phosphate are added to the paste as needed, and glycerol monooleate, sorbitan sesquioleate, homogenol (Kao Corporation) as a dispersant.
- the printability may be improved by adding a phosphoric ester of an alkyl allyl group or the like.
- the second dielectric layer paste is used to print on the first dielectric layer 81 by a screen printing method or a die coating method and then dried, and thereafter, the temperature is 550 slightly higher than the softening point of the dielectric material. Baking is performed at a temperature in the range of 0 ° C to 590 ° C.
- the film thickness of the dielectric layer 8 is preferably set to 41 ⁇ m or less in order to secure the visible light transmittance, including the first dielectric layer 81 and the second dielectric layer 82.
- the first dielectric layer 81 has a bismuth oxide (Bi 2 O 3 ) content of the second dielectric layer 82 in order to suppress the reaction of the metal bus electrodes 4b and 5b with silver (Ag). It is more than the content of 2 O 3 ) and is 20 wt% or more and 40 wt% or less.
- the film thickness of the first dielectric layer 81 is set to the film thickness of the second dielectric layer 82. It is set thinner.
- the bismuth oxide (Bi 2 O 3 ) is 11% by weight or less in the second dielectric layer 82, coloring is less likely to occur, but bubbles are likely to be generated in the second dielectric layer 82, which is not preferable. Further, if bismuth oxide (Bi 2 O 3 ) exceeds 40% by weight in the second dielectric layer 82, coloring tends to occur, which is not preferable for the purpose of increasing the transmittance.
- the thickness of the dielectric layer 8 is set to 41 ⁇ m or less, the first dielectric layer 81 is 5 ⁇ m to 15 ⁇ m, and the second dielectric layer 82 is 20 ⁇ m to 36 ⁇ m. It is as follows.
- the PDP manufactured in this manner has little coloring phenomenon (yellowing) of the front glass substrate 3 even when a silver (Ag) material is used for the display electrode 6, and bubbles are generated in the dielectric layer 8. Therefore, the dielectric layer 8 having excellent withstand voltage performance can be realized.
- the reason why yellowing and generation of bubbles in the first dielectric layer 81 are suppressed by these dielectric materials will be considered. That is, by adding molybdenum oxide (MoO 3 ) or tungsten oxide (WO 3 ) to dielectric glass containing bismuth oxide (Bi 2 O 3 ), Ag 2 MoO 4 , Ag 2 Mo 2 O 7 , Ag 2 are added. Compounds such as Mo 4 O 13 , Ag 2 WO 4 , Ag 2 W 2 O 7 , and Ag 2 W 4 O 13 are likely to be formed at a low temperature of 580 ° C. or lower.
- MoO 3 molybdenum oxide
- WO 3 tungsten oxide
- the firing temperature of the dielectric layer 8 is not less than 550 ° C. and not more than 590 ° C.
- silver ions (Ag + ) diffused in the dielectric layer 8 during firing are contained in the dielectric layer 8. It reacts with molybdenum oxide (MoO 3 ), tungsten oxide (WO 3 ), cerium oxide (CeO 2 ), and manganese oxide (MnO 2 ) to produce a stable compound and stabilize it. That is, since silver ions (Ag + ) are stabilized without being reduced, they do not aggregate to form a colloid. Therefore, the stabilization of silver ions (Ag + ) reduces the generation of oxygen accompanying the colloidalization of silver (Ag), thereby reducing the generation of bubbles in the dielectric layer 8.
- the content of manganese (MnO 2 ) is preferably 0.1% by weight or more, more preferably 0.1% by weight or more and 7% by weight or less. In particular, if it is less than 0.1% by weight, the effect of suppressing yellowing is small, and if it exceeds 7% by weight, the glass is colored, which is not preferable.
- the dielectric layer 8 of the PDP in the embodiment of the present invention suppresses the yellowing phenomenon and the generation of bubbles in the first dielectric layer 81 in contact with the metal bus electrodes 4b and 5b made of silver (Ag) material.
- High light transmittance is realized by the second dielectric layer 82 provided on the first dielectric layer 81.
- FIG. 4 is an enlarged view showing the protective layer portion of the PDP in the embodiment of the present invention.
- the protective layer 9 forms a base film 91 on the dielectric layer 8, and agglomerated particles 92 are dispersed on the base film 91 in a discrete manner. It is comprised by making it adhere so that it may distribute substantially uniformly over.
- the base film 91 is made of MgO containing Al as an impurity. Aggregated particles 92 are obtained by agglomerating several crystal particles 92a of MgO, which is a metal oxide.
- FIG. 5 is an enlarged view for explaining the agglomerated particles in the embodiment of the present invention.
- the aggregated particles 92 are those in which crystal particles 92a having a predetermined primary particle size are aggregated or necked as shown in FIG. This is not a solid bonded with a large bonding force, but a plurality of primary particles form an aggregated body due to static electricity, van der Waals force, or the like. Due to an external stimulus such as ultrasound, some or all of them are bound to the state of primary particles.
- the particle size of the agglomerated particles 92 is about 1 ⁇ m, and the crystal particles 92a preferably have a polyhedral shape having seven or more surfaces such as a tetrahedron and a dodecahedron.
- the primary particle size of the MgO crystal particles 92a can be controlled by the generation conditions of the crystal particles 92a.
- the particle size can be controlled by controlling the calcining temperature and the calcining atmosphere.
- the firing temperature can be selected in the range of about 700 degrees to 1500 degrees, but by setting the firing temperature to a relatively high 1000 degrees or more, the primary particle size can be controlled to about 0.3 to 2 ⁇ m. is there.
- the crystal particles 92a by heating the MgO precursor, it is possible to form aggregated particles 92 in which a plurality of primary particles are bonded together by a phenomenon called aggregation or necking in the generation process.
- Prototype 1 is a PDP in which only a protective layer made of MgO is formed.
- Prototype 2 is a PDP having a protective layer made of MgO doped with impurities such as Al and Si.
- Prototype 3 is a PDP in which only primary particles of crystal particles made of a metal oxide are dispersed and adhered onto a protective layer made of MgO.
- Prototype 4 is a product of the present invention, which is a PDP in which aggregated particles obtained by aggregating crystal particles are adhered on an underlayer of MgO so as to be distributed almost uniformly over the entire surface.
- FIG. 6 is a characteristic diagram showing the results of cathodoluminescence measurement of the crystal particles 92a.
- the horizontal axis represents the wavelength
- the vertical axis represents the emission intensity.
- the inventor examined the electron emission performance and the charge retention performance of the PDP having these four types of protective layer configurations.
- the electron emission performance is a numerical value indicating that the larger the electron emission amount, the greater the amount of electron emission.
- the initial electron emission amount can be measured by irradiating the surface with an ion or electron beam and measuring the amount of electron current emitted from the surface.
- a numerical value which is called a statistical delay time, which is a measure of the likelihood of occurrence of discharge is measured, and the reciprocal number is integrated. It becomes a numerical value corresponding to the amount of initial electron emission linearly. For this reason, this numerical value is used here for evaluation.
- This delay time at the time of discharge means the time of discharge delay that is delayed from the rise of the pulse, and the discharge delay is the time when the initial electrons that trigger when the discharge is started are discharged from the surface of the protective layer to the discharge space. It is considered as a main factor that it is difficult to be released into the inside.
- a voltage value of a voltage applied to the scan electrode (hereinafter referred to as a Vscn lighting voltage) necessary for suppressing the charge emission phenomenon when the PDP is created is used. . That is, the lower the Vscn lighting voltage, the higher the charge retention capability. Since this can be driven at a low voltage even in the panel design of the PDP, it is possible to use components having a small withstand voltage and capacity as the power source and each electrical component. In the current product, an element having a withstand voltage of about 150 V is used as a semiconductor switching element such as a MOSFET for sequentially applying a scanning voltage to the panel, and the Vscn lighting voltage is 120 V or less in consideration of variation due to temperature. It is desirable to keep it at a minimum.
- FIG. 7 shows the results of examining these electron emission performance and charge retention performance.
- the horizontal axis represents electron emission performance
- the vertical axis represents Vscn lighting voltage.
- the prototype 4 according to the present invention in which aggregated particles obtained by aggregating single crystal particles of MgO were dispersed on the base film made of MgO and adhered so as to be distributed almost uniformly over the entire surface.
- the Vscn lighting voltage can be set to 120 V or less.
- the electron emission performance can obtain good characteristics of 6 or more.
- the electron emission capability and the charge retention capability of the protective layer of the PDP are contradictory.
- the Vscn lighting voltage also increases.
- the PDP having the protective layer according to the present invention has both electron emission capability and charge retention capability for the protective layer of the PDP in which the number of scanning lines increases and the cell size tends to decrease due to high definition. Can be satisfied.
- the particle size of the crystal particles 92a will be described.
- the particle diameter means an average particle diameter
- the average particle diameter means a volume cumulative average diameter (D50).
- FIG. 8 shows the experimental results of examining the electron emission performance of the prototype 4 of the present invention described in FIG. 7 by changing the particle diameter of MgO crystal particles.
- the horizontal axis represents the particle diameter
- the vertical axis represents the electron emission performance.
- the particle diameter of the MgO crystal particles was measured by observing the crystal particles with an SEM.
- the crystal particles are present in the portion corresponding to the top portion of the partition wall of the back plate that is in close contact with the protective layer of the front plate, thereby damaging the top portion of the partition wall, and the material It has been found that a phenomenon occurs in which the corresponding cell does not normally turn on and off due to, for example, getting on the phosphor. The phenomenon of the partition wall breakage is unlikely to occur unless the crystal particles are present in the portion corresponding to the top of the partition wall. Therefore, if the number of attached crystal particles increases, the probability of the partition wall breakage increases.
- FIG. 9 is a diagram showing a result of an experiment on the relationship between partition wall breakage in the prototype 4 of the present invention described in FIG. 7 by spraying the same number of crystal particles having different particle sizes per unit area.
- the horizontal axis represents the particle size
- the vertical axis represents the partition wall breakage probability.
- the crystal particles have a particle size of 0.9 ⁇ m or more and 2.5 ⁇ m or less, but in the case of actual mass production as a PDP.
- FIG. 10 shows the experimental results.
- the horizontal axis represents the particle size
- the vertical axis represents the frequency.
- FIG. 11 shows experimental results of a deterioration acceleration test for investigating deterioration of the electron emission characteristics of aggregated particles over time in the PDP according to the present invention, and shows changes in electron emission characteristics with respect to elapsed time.
- the horizontal axis represents elapsed time
- the vertical axis represents electron emission performance.
- aggregated particles 92 in which a plurality of crystal particles 92a made of MgO are aggregated are attached to the protective layer 9, and the top of the partition 14 is formed on the phosphor layer 15.
- a hydrogen storage material made of a powder of a platinum group element platinum, palladium, ruthenium, rhodium, iridium, osmium
- platinum group element platinum group element
- an alloy powder of a platinum group element and a transition metal titanium, manganese, zirconium, nickel, cobalt, lanthanum, iron, vanadium
- a method for attaching the hydrogen storage material a printing method, a spray method, a photolithography method, a dispenser method, an ink jet method, or the like can be used. Good.
- the place where the platinum group element hydrogen storage material is attached is preferably a place where a discharge occurs during the display of a PDP image or the vicinity thereof.
- FIG. 12 and FIG. 13 show an example.
- the hydrogen storage material 17 is disposed on the surface of the partition wall 14, particularly on the top of the partition wall 14.
- the particle size of the platinum group powder must be such that no large gap is generated between the partition wall 14 and the protective layer 9, and is preferably 0.1 ⁇ m or more and 5 ⁇ m or less.
- the extent to which the platinum group powder is scattered on the top part of the partition 14 may be sufficient.
- a hydrogen storage material 17 may be included in the partition wall 14.
- the hydrogen storage material 17 is disposed on the protective layer 9 of the front plate 2.
- the covering ratio of the platinum group powder covering the protective layer 9 is 50% or less so that the platinum group powder does not hinder the transmission of visible light.
- the electron emission capability is 6 or more and the charge retention capability is Vscn lighting voltage of 120 V or less. be able to.
- both the electron emission capability and the charge retention capability can be satisfied as a protective layer of a PDP in which the number of scanning lines increases and the cell size tends to decrease due to high definition.
- the electron emission capability is less likely to deteriorate with time, it is possible to realize a PDP having high-definition and high-luminance display performance and low power consumption and long life.
- FIG. 14 is a diagram showing steps of forming a protective layer in the method for manufacturing a PDP according to the present invention.
- a dielectric layer forming step S11 for forming a dielectric layer 8 having a laminated structure of a first dielectric layer 81 and a second dielectric layer 82 is performed.
- a base film made of MgO is formed on the second dielectric layer 82 of the dielectric layer 8 by a vacuum deposition method using an MgO sintered body containing Al as a raw material. .
- an agglomerated particle paste prepared by mixing agglomerated particles 92 having a predetermined particle size distribution in a solvent together with a resin component is prepared.
- the agglomerated particle paste film forming step S13 the agglomerated particle paste is screen-printed.
- the agglomerated particle paste film is formed by coating on an unfired base film.
- a spray method, a spin coating method, a die coating method, a slit coating method, or the like is used as a method for forming the aggregated particle paste film by applying the aggregated particle paste onto the unfired base film. be able to.
- a firing step in which the unfired base film formed in the base film deposition step S12 and the aggregated particle paste film formed in the aggregated particle paste film forming step S13 and subjected to the drying step S14 are heated and fired at a temperature of several hundred degrees. In S15, it is fired simultaneously.
- the protective layer 9 in which a plurality of aggregated particles 92 are adhered on the base film 91.
- a method of spraying a particle group directly with a gas or the like without using a solvent, or a method of simply spraying using gravity may be used.
- MgO is taken as an example of the protective layer 9.
- the performance required for the substrate is to have a high anti-spattering performance for protecting the dielectric from ion bombardment, and the electron emission performance may not be so high.
- a protective layer mainly composed of MgO is very often formed in order to achieve both the electron emission performance above a certain level and the sputtering resistance performance.
- the electron emission performance is controlled predominantly by the metal oxide single crystal particles, other materials having excellent impact resistance such as Al 2 O 3 may be used.
- MgO particles as single crystal particles.
- other single crystal particles also oxidize metals such as Sr, Ca, Ba, and Al, which have high electron emission performance like MgO. The same effect can be obtained even when crystal grains made of a material are used. Therefore, the particle type is not limited to MgO.
- the aggregated particles in which a plurality of crystal particles made of a metal oxide film are aggregated are attached to the base film as a protective layer so as to be distributed over the entire surface, If the impurities such as hydrocarbons and organic solvents are not sufficiently removed, the excellent electron emission characteristics of the aggregated particles will deteriorate over time. Need to be removed.
- the present invention provides a PDP that improves electron emission characteristics, has charge retention characteristics, and achieves both high image quality, low cost, low voltage, and long life, thereby achieving low power consumption and high definition.
- a PDP having high luminance display performance can be realized.
- the present invention is a useful invention for realizing a PDP having a high-definition and high-luminance display performance, low power consumption and long life.
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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Gas-Filled Discharge Tubes (AREA)
Abstract
Description
以下、本発明の実施の形態におけるPDPについて図面を用いて説明する。
2 前面板
3 前面ガラス基板
4 走査電極
4a,5a 透明電極
4b,5b 金属バス電極
5 維持電極
6 表示電極
7 ブラックストライプ(遮光層)
8 誘電体層
9 保護層
10 背面板
11 背面ガラス基板
12 アドレス電極
13 下地誘電体層
14 隔壁
15 蛍光体層
16 放電空間
17 水素吸蔵性材料
81 第1誘電体層
82 第2誘電体層
91 下地膜
92 凝集粒子
92a 結晶粒子
Claims (6)
- 基板上に形成した表示電極を覆うように誘電体層を形成するとともにその誘電体層上に保護層を形成した前面板と、
放電空間を形成するように前記前面板に対向配置され、かつ前記表示電極と交差する方向にアドレス電極を形成するとともに、前記放電空間を区画する隔壁および蛍光体層を設けた背面板と
を有し、
前記保護層は、前記誘電体層上に下地膜を形成するとともに、前記下地膜に金属酸化物からなる複数個の結晶粒子が凝集した凝集粒子を付着させて構成し、
前記前面板と前記背面板の間の放電空間に水素吸蔵性材料を配置したプラズマディスプレイパネル。 - 前記凝集粒子は、平均粒径が0.9μm以上2μm以下の範囲にある請求項1に記載のプラズマディスプレイパネル。
- 前記下地膜はMgOにより構成した請求項1に記載のプラズマディスプレイパネル。
- 前記水素吸蔵性材料を前記蛍光体層の上または前記蛍光体層の内部に配置した請求項1に記載のプラズマディスプレイパネル。
- 前記水素吸蔵性材料を前記隔壁の表面または前記隔壁の内部に配置した請求項1に記載のプラズマディスプレイパネル。
- 前記水素吸蔵性材料を前記保護層の上に配置した請求項1に記載のプラズマディスプレイパネル。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2009801014507A CN101903967A (zh) | 2008-04-22 | 2009-04-20 | 等离子显示面板 |
KR1020097025078A KR101150632B1 (ko) | 2008-04-22 | 2009-04-20 | 플라즈마 디스플레이 패널 |
EP09733816A EP2270831A4 (en) | 2008-04-22 | 2009-04-20 | PLASMA SCOREBOARD |
US12/596,787 US8154204B2 (en) | 2008-04-22 | 2009-04-20 | Plasma display device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008111190A JP2009266405A (ja) | 2008-04-22 | 2008-04-22 | プラズマディスプレイパネル |
JP2008-111190 | 2008-04-22 |
Publications (1)
Publication Number | Publication Date |
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WO2009130874A1 true WO2009130874A1 (ja) | 2009-10-29 |
Family
ID=41216616
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2009/001788 WO2009130874A1 (ja) | 2008-04-22 | 2009-04-20 | プラズマディスプレイパネル |
Country Status (6)
Country | Link |
---|---|
US (1) | US8154204B2 (ja) |
EP (1) | EP2270831A4 (ja) |
JP (1) | JP2009266405A (ja) |
KR (1) | KR101150632B1 (ja) |
CN (1) | CN101903967A (ja) |
WO (1) | WO2009130874A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120013248A1 (en) * | 2010-03-01 | 2012-01-19 | Kyohei Yoshino | Plasma display panel |
Families Citing this family (1)
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JP4399344B2 (ja) | 2004-11-22 | 2010-01-13 | パナソニック株式会社 | プラズマディスプレイパネルおよびその製造方法 |
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- 2009-04-20 EP EP09733816A patent/EP2270831A4/en not_active Withdrawn
- 2009-04-20 CN CN2009801014507A patent/CN101903967A/zh active Pending
- 2009-04-20 WO PCT/JP2009/001788 patent/WO2009130874A1/ja active Application Filing
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Also Published As
Publication number | Publication date |
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CN101903967A (zh) | 2010-12-01 |
EP2270831A1 (en) | 2011-01-05 |
JP2009266405A (ja) | 2009-11-12 |
US8154204B2 (en) | 2012-04-10 |
KR20090130339A (ko) | 2009-12-22 |
KR101150632B1 (ko) | 2012-05-25 |
US20110204775A1 (en) | 2011-08-25 |
EP2270831A4 (en) | 2012-01-04 |
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