WO2010122730A1 - Panneau d'affichage à plasma et son procédé de fabrication - Google Patents

Panneau d'affichage à plasma et son procédé de fabrication Download PDF

Info

Publication number
WO2010122730A1
WO2010122730A1 PCT/JP2010/002637 JP2010002637W WO2010122730A1 WO 2010122730 A1 WO2010122730 A1 WO 2010122730A1 JP 2010002637 W JP2010002637 W JP 2010002637W WO 2010122730 A1 WO2010122730 A1 WO 2010122730A1
Authority
WO
WIPO (PCT)
Prior art keywords
display panel
plasma display
mgo
discharge
layer
Prior art date
Application number
PCT/JP2010/002637
Other languages
English (en)
Japanese (ja)
Inventor
浅野洋
井上修
白石誠吾
奥山浩二郎
森田幸弘
三浦正範
吉野恭平
Original Assignee
パナソニック株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Publication of WO2010122730A1 publication Critical patent/WO2010122730A1/fr

Links

Images

Classifications

    • 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
    • H01J9/02—Manufacture of electrodes or electrode systems
    • 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
    • H01J11/34—Vessels, containers or parts thereof, e.g. substrates
    • H01J11/40—Layers for protecting or enhancing the electron emission, e.g. MgO layers

Definitions

  • the present invention relates to a plasma display panel, and more particularly to an AC type plasma display panel.
  • PDPs Plasma display panels
  • FPDs flat panel displays
  • FIG. 4 is a diagram schematically showing the structure of a discharge cell in a general AC type PDP.
  • the PDP 1x shown in FIG. 4 is configured by pasting the front panel 2 and the back panel 9 together.
  • a plurality of display electrode pairs 6 each including the scanning electrode 5 and the sustain electrode 4 are disposed over one side of the front panel glass 3, and the dielectric layer 7 covers the display electrode pair 6. And the MgO layer 8 are sequentially laminated.
  • the scan electrode 5 and the sustain electrode 4 are configured by laminating transparent electrodes 51 and 41 and bus lines 52 and 42, respectively.
  • the dielectric layer 7 is formed of a low melting point glass having a glass softening point in the range of about 550 ° C. to 600 ° C., and has a current limiting function peculiar to the AC type PDP.
  • the MgO layer 8 is an example of a metal oxide layer, which protects the dielectric layer 7 and the display electrode pair 6 from plasma collision ion collisions, efficiently emits secondary electrons, and lowers the discharge start voltage. To play a role.
  • the MgO layer 8 is made of MgO having excellent secondary electron emission characteristics, sputtering resistance, and optical transparency by a thickness of 0.5 ⁇ m or more by a vacuum deposition method (Patent Documents 1 and 2) or a printing method (Patent Document 3). It is formed by forming a film with a thickness of about 1 ⁇ m.
  • a plurality of data (address) electrodes 11 for writing image data are provided on the back panel glass 10, and a dielectric layer 12 made of low-melting glass is disposed so as to cover the data electrodes 11.
  • a partition wall (rib) 13 having a predetermined height made of low-melting glass separates the discharge space 15 so as to form a pattern portion 1231 having a grid pattern or the like.
  • 1232 and phosphor layers 14 formed by applying and firing phosphor inks of R, G, B colors on the surface of the dielectric layer 12 and the side surfaces of the barrier ribs 13. ) Is formed.
  • the front panel 2 and the back panel 9 are arranged such that the display electrode pair 6 and the data electrode 11 are orthogonal to each other via the discharge space 15, and each periphery thereof is sealed and sealed internally.
  • the discharge space 15 is filled with a rare gas such as Xe—Ne or Xe—He as a discharge gas at a pressure of about several tens of kPa.
  • a gradation expression method for example, an intra-field time division display method that divides an image of one field into a plurality of subfields (SF) is used.
  • Discharge delay refers to a phenomenon in which discharge occurs after the application of a pulse voltage. When “discharge delay” becomes prominent, the probability of completion of discharge within the applied pulse width decreases, and the lamp is originally lit. A lighting failure occurs because writing cannot be performed in the power cell. In particular, when high-speed driving is performed by narrowing the width of the driving pulse, or in a high-definition cell structure, such a lighting failure due to a discharge delay is particularly apparent.
  • discharge delay is considered to be mainly due to the characteristics of the protective layer.
  • MgO which is the main material of the protective layer, is doped with elements such as Fe, Cr, V, Si, Al, etc. Attempts have been made to improve the discharge characteristics of the protective layer by adding the dopant (Patent Documents 1 and 2).
  • the protective layer is formed by arranging the MgO single crystal fine particles produced by the vapor phase oxidation method in a layer form directly on the dielectric layer or on the MgO film produced by the thin film method. Attempts have also been made to improve the surface discharge characteristics (Patent Document 3). According to the method of Patent Document 3, it is said that a certain improvement can be achieved with respect to reduction of discharge delay at low temperatures.
  • Patent Document 3 uses MgO fine particles (powder) produced by a gas phase oxidation method, but the particles produced by the gas phase oxidation method have a relatively varied particle size. A large number of fine particles are contained for large particles. Such a large number of fine particles contain fine particles that do not substantially contribute to prevention / suppression of discharge delay. Therefore, a practical discharge delay suppressing effect cannot be obtained unless a relatively large amount of MgO fine particles are dispersed in the PDP. On the other hand, if a large amount of MgO fine particles are disposed on the dielectric layer or the MgO layer, the visible light generated by the phosphor is scattered and the visible light transmittance is reduced.
  • Patent Document 4 a method of removing MgO fine particles having a small particle diameter by classification has been proposed (Patent Document 4).
  • Patent Document 4 it is necessary to perform a new classification process, which increases the number of processes and lowers the production efficiency, and also requires a large classification apparatus.
  • various problems in terms of manufacturing costs occur in industrial production such as generation of useless MgO materials that cannot be used after the classification process.
  • the characteristic fluctuation is small when the PDP is displayed for a long time.
  • these characteristics change over time, which is a problem to be solved.
  • the present invention is configured such that a first substrate including an electrode and a dielectric layer is disposed to face a second substrate through a discharge space, and the periphery of both the first and second substrates is sealed.
  • the first material made of MgO fine particles containing halogen atoms so as to face the discharge space, and one kind selected from Ca, Sr, and Ba
  • the second material composed of fine particles of a compound containing Sn as a main component was present.
  • a metal oxide layer mainly composed of MgO is provided on the discharge space side of the dielectric layer, and the first material and the second material are disposed on the discharge space side of the metal oxide layer. Good.
  • Halogen atoms are preferably contained in the vicinity of the surface layer of the MgO fine particles.
  • halogen atom a fluorine atom or a chlorine atom can be used.
  • compound constituting the second material a crystalline oxide containing one or more selected from Ca, Sr, and Ba and Sn in a specific ratio is preferable.
  • one or more crystalline compounds selected from CaSnO 3 , SrSnO 3 , BaSnO 3 , or a solid solution in which these are solid-solved with each other are preferable.
  • the coverage with which the fine particles constituting the first material and the second material cover the dielectric layer is preferably 1.0% or more and 50% or less in projected area ratio.
  • a metal oxide layer forming step of forming a metal oxide layer on the surface of the dielectric layer on the first substrate on which the electrode and the dielectric layer are disposed A sealing step is provided in which the first substrate on which the oxide layer is formed and the second substrate are disposed opposite to each other and sealed, and the metal oxide layer is formed between the metal oxide forming step and the sealing step.
  • a step of disposing a first material and a second material on the surface is provided.
  • the first material magnesium fluoride, magnesium chloride, aluminum fluoride, calcium fluoride, fluoride are applied to the MgO precursor.
  • MgO fine particles obtained by firing a material obtained by adding at least one selected from lithium, magnesium chloride, aluminum chloride, calcium chloride, lithium chloride, and sodium chloride as a sintering aid, material To, Ca, Sr, one or more selected from Ba, and we decided to use the particulate compound mainly containing Sn.
  • the first material and the second material it is preferable to dispose the first material on the surface of the metal oxide layer and then dispose the second material.
  • the first material composed of MgO fine particles containing a halogen atom the second material composed of fine particles of a compound mainly composed of Sn, one or more selected from Ca, Sr, and Ba. Both of these materials have a high secondary electron emission coefficient ⁇ , and these are arranged so as to face the discharge space on the surface of the dielectric layer. Therefore, when the PDP is driven, 2 is directed toward the discharge space. Secondary electrons are abundantly emitted. Therefore, compared with the conventional PDP, the discharge delay is suppressed and the driving can be performed at a low voltage.
  • the discharge delay reduction effect and the reduction effect are maintained for a long time.
  • this is an effect based on the interaction by disposing different types of the first material and the second material.
  • the discharge delay reduction effect and the drive voltage reduction effect can be obtained without setting the coverage ratios of the first material and the second material to the MgO layer or the dielectric layer so high.
  • the PDP manufactured by the manufacturing method of the present invention has the same effect.
  • an excellent image display performance can be exhibited even during high-speed driving due to a discharge delay suppressing effect, and a driving voltage reduction effect can also be obtained.
  • FIG. 1 is a schematic cross-sectional view (a cross-sectional view along the XZ plane of FIG. 4) of the PDP 1 according to the embodiment.
  • positioned on the surface of the MgO layer 8 are typically shown larger than actual for description.
  • the PDP 1 is broadly divided into a first substrate (front panel 2) and a second substrate (back panel 9) that are disposed with their main surfaces facing each other.
  • a front panel glass 3 serving as a substrate of the front panel 2 has a display electrode pair 6 (scanning electrode 5 and sustaining electrode 4) extending in the Y direction with a predetermined discharge gap on one main surface thereof in the X direction.
  • a plurality of pairs are formed side by side.
  • Each display electrode pair 6 includes a strip-shaped transparent electrode 51, 41 made of a transparent conductive material such as indium tin oxide (ITO), zinc oxide (ZnO), tin oxide (SnO 2 ), an Ag thick film, an Al thin film, Alternatively, bus lines 52 and 42 made of a Cr / Cu / Cr laminated thin film or the like are laminated, and the sheet resistance of the display electrode pair 6 is lowered by the bus lines 52 and 42.
  • the “thick film” means a film formed by various thick film methods formed by applying a paste containing a conductive material and baking it.
  • the “thin film” refers to a film formed by various thin film methods using a vacuum process, including a sputtering method, an ion plating method, an electron beam evaporation method, and the like.
  • the front panel glass 3 provided with the display electrode pair 6 has a low melting point glass mainly composed of lead oxide (PbO), bismuth oxide (Bi 2 O 3 ) or phosphorus oxide (PO 4 ) over the entire main surface.
  • the dielectric layer 7 is formed by a screen printing method or the like.
  • the dielectric layer 7 has a current limiting function peculiar to the AC type PDP, and is an element that realizes a longer life than the DC type PDP.
  • An MgO layer 8 is formed on the surface of the dielectric layer 7 in the front panel 2, and the first electron emitting material 16a and the second electron emitting material 16b are formed on the surface of the MgO layer 8 so as to face the discharge space.
  • the first electron emission material 16a is made of MgO fine particles containing halogen atoms
  • the second electron emission material 16b is composed mainly of one or more selected from Ca, Sr, and Ba and Sn. Fine particles made of the compound
  • a protective layer 17 that protects the dielectric layer 7 is constituted by the MgO layer 8 and the first electron emission material 16a and the second electron emission material 16b.
  • the MgO layer 8 protects the dielectric layer 7 and the display electrode pair 6 from ion collision of plasma discharge, efficiently emits secondary electrons, and lowers the discharge start voltage. It is a thin film formed of MgO having an excellent electron emission coefficient ⁇ and good optical transparency and electrical insulation.
  • a back panel glass 10 serving as a substrate of the back panel 9 has a data electrode 11 made of any one of an Ag thick film, an Al thin film, a Cr / Cu / Cr laminated thin film, etc. on one main surface, extending in the X direction. As the direction, they are arranged in parallel in the Y direction at regular intervals.
  • a dielectric layer 12 is disposed over the entire surface of the back panel glass 9 so as to enclose each data electrode 11.
  • a grid-like partition wall 13 is further arranged in accordance with the gap between adjacent data electrodes 11, and serves to prevent erroneous discharge and optical crosstalk by partitioning the discharge cells. Yes.
  • a phosphor layer 14 corresponding to each of red (R), green (G), and blue (B) for color display is provided on the side surface of two adjacent barrier ribs 13 and the surface of the dielectric layer 12 therebetween. Is formed.
  • the blue phosphor (B) has a known BAM: Eu
  • the red phosphor (R) has (Y, Gd) BO 3 : Eu
  • Y 2 O 3 : Eu, etc. ) May be Zn 2 SiO 4 : Mn
  • the dielectric layer 12 is not essential, and the data electrode 11 may be directly included in the phosphor layer 14.
  • the front panel 2 and the back panel 9 are arranged to face each other so that the longitudinal directions of the data electrode 11 and the display electrode pair 6 are orthogonal to each other, and the outer peripheral edge portions of both the panels 2 and 9 are sealed with glass frit.
  • a discharge gas composed of an inert gas component containing He, Xe, Ne or the like is sealed between the panels 2 and 9 at a predetermined pressure.
  • a discharge space 15 is formed between the barrier ribs 13, and a region where the display electrode pair 6 and one data electrode 11 intersect with each other across the discharge space 15 is a discharge cell (also referred to as “sub-pixel”) for image display.
  • a discharge cell also referred to as “sub-pixel” for image display.
  • One discharge pixel is composed of three discharge cells corresponding to adjacent RGB colors.
  • Scan electrode driver 111, sustain electrode driver 112, and data electrode driver 113 are electrically connected to each of scan electrode 5, sustain electrode 4 and data electrode 11 as drive circuits in the vicinity of the end in the panel XY direction as shown in FIG. Connected to.
  • sustain electrodes 4 are collectively connected to sustain electrode driver 112, and each scan electrode 5 and each data electrode 11 are independently connected to scan electrode driver 111 or data electrode driver 113, respectively.
  • the PDP 1 is applied with an AC voltage of several tens of kHz to several hundreds of kHz between the display electrode pairs 6 during driving by a known driving circuit (not shown) including the drivers 111 to 113.
  • a discharge is generated in an arbitrary discharge cell, and ultraviolet rays (dotted line and arrow in FIG. 1) including a resonance line mainly composed of a wavelength of 147 nm due to excited Xe atoms and a molecular line mainly composed of a wavelength of 172 nm due to excited Xe molecules are phosphor layer 14. Is irradiated.
  • the phosphor layer 14 is excited to emit visible light.
  • the visible light passes through the front panel 2 and is emitted to the front surface.
  • an in-field time division gradation display method is adopted.
  • the field is divided into a plurality of subfields (SF), and each subfield is further divided into a plurality of periods.
  • each subfield has (1) an initialization period in which the wall charges of all the discharge cells are reset by an initialization pulse, and (2) addresses the discharge cells to be lit corresponding to the input data.
  • Write period for accumulating wall charges (3) sustain period for causing the addressed discharge cells to emit light by applying an alternating voltage (sustain voltage) to all the discharge cells simultaneously, and (4) sustain discharge. Is divided into four periods, ie, an erasing period for erasing the wall charges formed.
  • FIG. 3 shows an example of drive waveforms in the mth subfield in the field. As shown in FIG. 3, an initialization period, an address period, a sustain period, and an erase period are assigned to each subfield.
  • the wall charge of the entire screen is erased (initialization discharge) in order to prevent the influence of the previous discharge cell lighting (effect of accumulated wall charge).
  • a voltage (initialization pulse) higher than that of the data electrode 11 and the sustain electrode 4 is applied to the scan electrode 5 to discharge the gas in the discharge cell.
  • the charges generated thereby are accumulated on the wall of the discharge cell so as to cancel the potential difference between the data electrode 11, the scan electrode 5 and the sustain electrode 4, so that the MgO layer 8 and the first electron emission material 16a near the scan electrode 5 Negative charges are accumulated as wall charges on the surface of the second electron emission material 16b.
  • positive charges are accumulated as wall charges on the surface of the phosphor layer 14 near the data electrode 11 and on the surface of the MgO layer 8 near the sustain electrode 4 and the first electron emission material 16a and the second electron emission material 16b. Due to this wall charge, a predetermined wall potential is generated between scan electrode 5 and data electrode 11 and between scan electrode 5 and sustain electrode 4.
  • the address period (writing period)
  • addressing setting of lighting / non-lighting of the discharge cell selected based on the image signal divided into subfields is performed.
  • a voltage (scanning pulse) lower than that of the data electrode 11 and the sustain electrode 4 is applied to the scanning electrode 5. That is, a voltage having the same polarity as the wall potential is applied to scan electrode 5 -data electrode 11, and a data pulse having the same polarity as the wall potential is applied between scan electrode 5 and sustain electrode 4, thereby address discharge (writing Discharge).
  • a voltage pulse for sustain discharge (for example, a rectangular wave voltage of about 200 V) is applied to scan electrode 5 and sustain electrode 4 in different phases. Thereby, in the written discharge cell, a pulse discharge is generated every time the voltage polarity changes.
  • This sustain discharge emits a resonance line of 147 nm from the excited Xe atoms in the discharge space and a molecular beam mainly composed of 173 nm from the excited Xe molecules.
  • the surface of the phosphor layer 14 is irradiated with the resonance line / molecular beam, and display light is emitted by visible light emission. Then, multi-color / multi-tone display is performed by a combination of sub-field units of RGB colors. In a non-discharge cell in which wall charges are not written, no sustain discharge occurs and the display state is black.
  • the protective layer 17 in the PDP 1 is composed of an MgO layer 8 laminated on the dielectric layer 7, and a first electron emission material 16a and a second electron emission material 16b disposed thereon.
  • the MgO layer 8 is a thin film formed of an MgO material, and is formed on the dielectric layer 7 by a known thin film forming method such as a vacuum deposition method or an ion plating method.
  • the material of the MgO layer 8 is not limited to MgO but may include other metal oxides containing MgO as a main component.
  • the first electron emission material 16a has a configuration in which halogen atoms are included in the vicinity of the surface of MgO fine particles having a uniform particle size distribution.
  • Such halogen atoms are mainly contained in the vicinity of the surface of each MgO fine particle, specifically, in a range of 4 nm or less from the surface toward the inside of the particle.
  • the site involved in the discharge characteristics can be considered only near the surface, so it is important to contain halogen atoms near the surface.
  • the MgO fine particles containing halogen atoms in the vicinity of the surface can be obtained by firing a mixed powder obtained by mixing an MgO precursor and a sintering aid.
  • MgO precursor one or more of magnesium oxide, magnesium hydroxide, magnesium carbonate, magnesium alkoxide, magnesium nitrate, and magnesium acetate can be used.
  • a sintering aid As a sintering aid, one of halogen compounds such as magnesium fluoride, magnesium chloride, aluminum fluoride, calcium fluoride, lithium fluoride, magnesium chloride, aluminum chloride, calcium chloride, lithium chloride, sodium chloride, etc. The above can be used. In addition, when elements other than magnesium are contained as a residual element after firing, depending on the element type, the discharge characteristics are affected, so the sintering aid can be properly used.
  • the raw material may be mixed by either wet mixing using a solvent or dry mixing in which a dry powder is mixed.
  • alcohol such as ethyl alcohol, methyl alcohol, iso-propyl alcohol, n-propyl alcohol, n-butoxy alcohol, sec-butoxy alcohol, tert-butoxy alcohol, or acetic acid is used as a solvent.
  • Acetic esters such as butyl, ethyl acetate, methyl acetate, and 2-methoxyethyl acetate, and ketones such as acetone, methyl ethyl ketone, and methyl isobutyl ketone can be used, and are not particularly limited.
  • a ball mill, a medium stirring mill, a planetary ball mill, a vibration mill, a jet mill, a V-type mixer, and the like that are generally used in industry can be used.
  • the first electron-emitting material 16a is obtained by firing the mixed powder of MgO precursor and sintering aid at 600 ° C. to 1800 ° C., preferably 900 ° C. to 1500 ° C. for 15 minutes to 10 hours.
  • the firing temperature and firing time are appropriately adjusted according to various conditions such as the particle size and classification conditions of the precursor used, the amount of sintering aid added, and the amount of mixed powder.
  • the firing atmosphere can be performed in an oxidizing or reducing atmosphere.
  • the calcination step is performed, for example, by baking at 700 to 1000 ° C. for 15 minutes to 5 hours in the atmosphere.
  • the calcination temperature and the calcination time are appropriately adjusted according to the difference in conditions as described above. To do.
  • the powder obtained by the calcining step is pulverized and mixed, and then processed in the main baking step.
  • the mixing method of the calcined powder at this time may be either wet mixing or dry mixing. However, in the case of wet mixing, a solvent accompanying dissolution of MgO, such as water, cannot be used.
  • a firing furnace used in each firing step a furnace generally used in industry, for example, a continuous type such as a pusher furnace, a batch type electric furnace, a gas furnace, or the like can be used.
  • the first electron-emitting material 16a obtained in the main firing step can be crushed again using a ball mill, a jet mill or the like, and the particle size distribution and fluidity can be adjusted.
  • the halogen component added to the sintering aid will be burned out together with the flow gas, resulting in the final production
  • the halogen concentration in the MgO fine particles decreases.
  • it is desirable to take measures such as putting a material component in a high-purity alumina crucible and applying a suitable sealing measure such as covering and performing a firing step in a firing furnace.
  • the second electron-emitting material 16b is made of a compound containing at least one of Ca, Sr, and Ba and Sn and O as main components.
  • This compound may be in an amorphous state, but is preferably a crystalline compound in order to further improve the stability.
  • preferred crystalline compounds include the following.
  • the one where the content is large is considered that secondary electron emission efficiency is high.
  • Ba 3 Sn 2 O 7 has higher secondary electron emission efficiency than BaSnO 3
  • Ba 2 SnO 4 has higher secondary electron emission efficiency.
  • CaSnO 3 , SrSnO 3 BaSnO 3 is the most desirable because it is a compound that is as stable as MgO and can be used without any particular atmosphere control and has higher electron emission efficiency than MgO.
  • the solid phase method is a method in which raw material powders (metal oxide, metal carbonate, etc.) containing each metal are mixed and heat-treated at a temperature of a certain level or more to react.
  • liquid phase method a solution containing each metal is prepared, and a solid phase is precipitated from this solution, or after applying this solution on a substrate, it is dried and subjected to a heat treatment or the like at a temperature of a certain level or more. It is a method to do.
  • the vapor phase method is a method for obtaining a film-like solid phase by a method such as vapor deposition, sputtering, or CVD.
  • a method such as vapor deposition, sputtering, or CVD.
  • Ca, Sr, Ba and Sn have a specific ratio, one or more selected from Ca, Sr and Ba, Sn, O It is also possible to obtain an amorphous compound mainly composed of (oxygen).
  • This amorphous film is also chemically more stable than CaO, SrO, and BaO and has a higher secondary electron emission efficiency than MgO, so that the driving voltage of the PDP can be reduced.
  • the chemical stability is higher for the crystalline compound, and as a synthesis method, the vapor phase method is more expensive than the solid phase method, and thus the crystalline compound is more desirable.
  • the synthesis method by the solid phase method is most desirable.
  • the raw material species used in the solid phase method is not particularly limited, and for example, oxides, hydroxides, halides, carbonates, nitrates, and the like can be used.
  • a ball mill, a medium stirring mill, a planetary ball mill, a vibration mill, a jet mill, a V-type mixer, etc. which are usually used industrially, are wet. Alternatively, it can be dry mixed.
  • the solvent to be used can be appropriately selected as in the case of the synthesis of the first electron emission material.
  • 2nd electron emission material 16b is obtained by baking the mixed powder at 1200 ° C. to 1500 ° C. for 15 minutes to 10 hours.
  • the firing temperature and firing time are appropriately adjusted according to various conditions such as the particle diameter of the raw material used, classification conditions, and the amount of mixed powder.
  • the firing atmosphere can be performed in an oxidizing or reducing atmosphere.
  • the second electron emission material 16b obtained in the main firing step may be crushed again using a ball mill, a jet mill, or the like to adjust the particle size distribution and fluidity.
  • the first electron emission material 16a and the second electron emission material 16b thus produced are planarly formed by a spray method, an electrostatic coating method, a slit coating method, a doctor blade method, or a die coating method. Apply to set.
  • the coating method is not limited to these, and coating may be performed by other methods.
  • the manufacturing cost it is common to use a screen printing method widely used industrially as a thick film forming technique.
  • the screen printing method is also excellent in that the coating amount can be easily controlled by the solid content ratio of the ink used and the specifications of the screen mesh.
  • the second electron-emitting material 16b exhibits the effect of reducing the discharge voltage regardless of the surface area exposed to the discharge space, so that the proportion of the particle surface shielded from the discharge space may be reduced.
  • the effect of shortening the discharge delay time is reduced when the surface area of the particles exposed to the discharge space is reduced.
  • the second electron emission material 16b is applied first, and then the first electron emission material 16a is applied to expose the first electron emission material 16a preferentially to the discharge space. It is preferable to obtain both the effect of reducing the discharge voltage by the material 16b and the effect of reducing the discharge delay time by the first electron emitting material 16a.
  • the application amount of the first electron emission material 16a and the second electron emission material 16b is the amount of change in the linearly transmitted light of the front panel before and after the film formation of the first electron emission material 16a and the second electron emission material 16b (visible light). ) Can be set based on the “coverage” defined from the measured values.
  • Coverage (%) [1 ⁇ (front panel linear transmission light amount before film formation of first electron emission material 16a and second electron emission material 16b) / (of first electron emission material 16a and second electron emission material 16b) Front panel straight transmitted light after film formation)] ⁇ 100
  • the coverage when the first electron-emitting material 16 a and the second electron-emitting material 16 b are dispersed on the MgO layer 8 is 1.
  • it is preferable to coat with a projected area ratio of 0% or more it is not limited to this range.
  • This coverage can be adjusted by changing the particle diameters of the first electron-emitting material and the second electron-emitting material and the coating weight thereof. It is preferable to appropriately adjust the coating weights of the two types of materials according to the particle diameter of the materials to be used so as to obtain the best characteristics as a PDP.
  • the upper limit of the coverage if a large amount of the first electron-emitting material 16a and the second electron-emitting material 16b are disposed on the dielectric layer or the MgO layer, the visible light generated by the phosphor is scattered and visible. Since the light transmittance decreases, it is desirable to set the coverage to 50% or less.
  • the first electron emission material 16 a and the second electron emission material 16 b may be disposed in the entire region on the MgO layer 8, but the first electrons are partially formed in any region on the MgO layer 8. It is also possible to dispose the emission material 16a and the second electron emission material 16b. For example, it may be disposed only on the scan electrode 5 and the sustain electrode 4, or may be disposed only in the central region of each discharge cell.
  • the first electron emission material 16 a and the second electron emission material 16 b are dispersed on the surface of the MgO layer 8, but without forming the MgO layer 8 on the dielectric layer 7.
  • the first electron emission material 16a and the second electron emission material 16b may be directly dispersed.
  • the first electron-emitting material composed of MgO fine particles containing halogen atoms, the second fine particle composed of one or more selected from Ca, Sr, and Ba, and compounds composed mainly of Sn.
  • the electron emission material is present on the surface of the dielectric layer 7 so as to face the discharge space.
  • the PDP 1 can be driven at a low voltage.
  • the first electron emission material is also excellent in the effect of suppressing the discharge delay.
  • the PDP 1 according to this embodiment can be driven at a low voltage with a reduced discharge delay.
  • the amount of the first electron emitting material and the second electron emitting material disposed on the MgO layer is small, it is possible to obtain a discharge delay suppressing effect and a driving voltage reducing effect. That is, it is possible to obtain a discharge delay suppressing effect and a driving voltage reducing effect while ensuring the visible light transmittance of the front panel.
  • the first electron emission material and the second electron emission material are present on the MgO layer, so that the discharge delay reduction effect and the drive voltage reduction effect can be stably obtained for a long time.
  • the mechanism is unknown in detail at present, it is an effect obtained by the coexistence and interaction of different materials such as the first electron emission material 16a and the second electron emission material 16b.
  • the PDP according to the example of the present invention was manufactured together with a comparative example, and a performance evaluation test was performed.
  • a performance evaluation test was performed.
  • the configuration of the example and the method of the performance evaluation test do not limit the present invention.
  • Example 1 The first electron-emitting material was manufactured as follows.
  • Mg (OH) 2 having a purity of 99.99% was used as the MgO precursor. Further, magnesium fluoride having a purity of 99.9% was used as a sintering aid. 0.25 mol% of magnesium fluoride with respect to Mg (OH) 2 was weighed and added, and wet-mixed in pure water using a planetary ball mill and zirconia beads. After drying this mixture, it was crushed in a mortar and fired in a high purity alumina crucible. The firing temperature was 1200 ° C., and the firing was continued for 15 minutes.
  • the fired MgO fine particles were dry pulverized using a ball mill and passed through a nylon mesh to remove coarse particles, which was used as the first electron emission material.
  • the average particle diameter of the first electron emitting material and the second electron emitting material was 1 ⁇ m.
  • the first electron-emitting material synthesized as described above and each second electron-emitting material were applied on the MgO layer as follows.
  • the first electron-emitting material and the second electron-emitting material are mixed at a weight ratio of 3: 1 to create a mixed powder, and the mixed powder, a solvent, and a resin are mixed, and a three-roll mill is prepared. And kneaded to obtain an ink for screen printing.
  • the first electron-emitting material and the second electron-emitting material were collectively applied using a screen printing method so that the coverage was 4.5%. After film formation, the film was dried at 100 ° C. for 1 hour and then baked at 500 ° C. for 3 hours to burn off organic components.
  • Three types of AC surface discharge type PDPs were prepared using the three types of front panels thus obtained.
  • the discharge gas is Xe 100% 150 Torr
  • An AC surface discharge type PDP was produced in the same manner as in Example 1 except that a front panel without the first electron emitting material 16a and the second electron emitting material 16b was used.
  • Example 2 An AC surface discharge type PDP was produced in the same manner as in Example 1 except that a front panel in which only the first electron-emitting material containing a halogen atom was disposed on the MgO layer was used.
  • the weight of the first electron-emitting material disposed was the same as the weight of the first electron-emitting material disposed in Example 1.
  • Example 3 Mg (OH) 2 to which no magnesium fluoride was added was fired in the same manner as in the production of the MgO fine particles of Example 1 to synthesize MgO fine particles (MgO fine particles containing no halogen atoms).
  • An AC surface discharge type PDP was produced in the same manner as in Example 1 except that a front panel in which only MgO fine particles not containing halogen atoms were disposed on the MgO layer was used.
  • the weight of the MgO fine particles disposed was the same as the weight of the first electron-emitting material disposed in Example 1.
  • Example 4 An AC surface discharge type PDP was produced in the same manner as in Example 1 except that a front panel in which only the second electron emission material was disposed on the MgO layer was used.
  • the weight for disposing the second electron-emitting material was the same as the weight for disposing the second electron-emitting material in Example 1.
  • a data pulse and a scanning pulse are repeatedly applied to an arbitrary pixel in each PDP, and the light emission of the phosphor accompanying the discharge is received by the optical sensor module.
  • the waveform and the received light signal waveform were measured by observing with a digital oscilloscope.
  • discharge delay time The time from the application of a pulse to the occurrence of discharge (discharge delay time) was measured 100 times, and the average of the maximum and minimum values of the measured discharge delay time was calculated as the discharge delay time.
  • the discharge start voltage is determined by connecting the panel to the drive circuit, inputting the drive waveform shown in FIG. 3 to display white lighting, and measuring the minimum value of the sustain voltage at which lighting can be confirmed in all areas. It was.
  • Example 1 CaSnO 3 as the second electron emitting material, SrSnO 3, there are three types using BaSnO 3, in FIGS. 5 and 6, a typically BaSnO 3 as the second electron emitting material Shows the results for what was.
  • Comparative Example 3 and Comparative Example 4 do not have the effect of reducing the discharge delay time compared to Comparative Example 1.
  • Comparative Example 2 in which the first electron-emitting material containing halogen atoms is provided, the initial discharge delay time is greatly shortened.
  • Example 1 although inferior to Comparative Example 2, the discharge delay time is shortened compared to Comparative Example 1, and the discharge delay is reduced to about 30 nsec, so that it can be driven at high speed without causing a lighting failure. I understand.
  • Example 1 discharge delay time shortening effect of Example 1 is inferior to that of Comparative Example 2 because the first electron-emitting material and the second electron-emitting material are mixed in Example 1, and thus the first electron-emitting material. Is partially shielded by the second electron emission material, and it is assumed that the characteristics of the first electron emission material and the second electron emission material are offset.
  • Example 1 it is not clear why the time-dependent change in the discharge delay time is small, but the first electron-emitting material 16a and the second electron-emitting material 16b, which are different from each other, coexist and are specific in the discharge space. It seems that the phenomenon is occurring.
  • Example 1 the discharge start voltage after lighting for 400 hr is almost the same as the initial discharge start voltage.
  • the change with time of the discharge start voltage is small because the tendency of Comparative Example 2 in which the first electron-emitting material is provided and the second electron-emitting material are provided as described above.
  • the tendency of the comparative example 4 is opposite, and it is considered that the effect of showing the opposite tendency is combined.
  • Example 1 it is considered that the initial discharge delay time and the discharge start voltage can be adjusted by adjusting the ratio of the first electron emission material and the second electron emission material.
  • Example 1 As a test result of Example 1, the case where BaSnO 3 was used as the second electron emission material was described. However, the same measurement was performed when CaSnO 3 and SrSnO 3 were used as the second electron emission material. It was confirmed that the effect of. However, the greatest effect was obtained when BaSnO 3 was used. This is compared to CaSnO 3, SrSnO 3, it considered the stability of BaSnO 3 is due to the more excellent.
  • a high-definition image display PDP can be driven with a low voltage, and can be used for a television set, a display device for a computer, and the like in transportation, public facilities, and homes. is there.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Manufacturing & Machinery (AREA)
  • Gas-Filled Discharge Tubes (AREA)

Abstract

L'invention porte sur un panneau d'affichage à plasma (PDP) dans lequel on supprime le retard de décharge et la tension de début de décharge par une amélioration des caractéristiques de décharge d'une couche de protection et au moyen duquel on peut présenter d'excellentes performances d'affichage d'image avec une structure cellulaire très fine. Sur la surface d'une couche diélectrique (7) d'un panneau avant (2) est disposée une couche de MgO (8), et sur la surface de la couche de MgO (8) sont dispersés un premier matériau émetteur d'électron (16a), composé de fines particules de MgO contenant des atomes halogènes, et un second matériau émetteur d'électron (16b), composé de fines particules d'un composé comprenant un ou plusieurs types d'éléments sélectionnés à partir de Ca, Cr et Ba, et Sn en tant que composant principal. La couche de protection (17) est composée de la couche de MgO (8), du premier matériau émetteur d'électron (16a) dispersé et du second matériau émetteur d'électron (16b) dispersé.
PCT/JP2010/002637 2009-04-21 2010-04-12 Panneau d'affichage à plasma et son procédé de fabrication WO2010122730A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009-103089 2009-04-21
JP2009103089 2009-04-21

Publications (1)

Publication Number Publication Date
WO2010122730A1 true WO2010122730A1 (fr) 2010-10-28

Family

ID=43010859

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2010/002637 WO2010122730A1 (fr) 2009-04-21 2010-04-12 Panneau d'affichage à plasma et son procédé de fabrication

Country Status (1)

Country Link
WO (1) WO2010122730A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004273158A (ja) * 2003-03-05 2004-09-30 Noritake Co Ltd 放電表示装置の保護膜材料
JP2008041438A (ja) * 2006-08-07 2008-02-21 Pioneer Electronic Corp プラズマディスプレイパネル
JP2008293803A (ja) * 2007-05-24 2008-12-04 Hitachi Ltd プラズマディスプレイパネル及びその製造方法
WO2009081589A1 (fr) * 2007-12-26 2009-07-02 Panasonic Corporation Panneau d'affichage à plasma
JP2009170191A (ja) * 2008-01-15 2009-07-30 Panasonic Corp プラズマディスプレイパネルとその製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004273158A (ja) * 2003-03-05 2004-09-30 Noritake Co Ltd 放電表示装置の保護膜材料
JP2008041438A (ja) * 2006-08-07 2008-02-21 Pioneer Electronic Corp プラズマディスプレイパネル
JP2008293803A (ja) * 2007-05-24 2008-12-04 Hitachi Ltd プラズマディスプレイパネル及びその製造方法
WO2009081589A1 (fr) * 2007-12-26 2009-07-02 Panasonic Corporation Panneau d'affichage à plasma
JP2009170191A (ja) * 2008-01-15 2009-07-30 Panasonic Corp プラズマディスプレイパネルとその製造方法

Similar Documents

Publication Publication Date Title
JP4148985B2 (ja) プラズマディスプレイパネル
JP4129288B2 (ja) プラズマディスプレイパネルとその製造方法
JP4148982B2 (ja) プラズマディスプレイパネル
EP2063447B1 (fr) Écran à plasma et procédé de fabrication de celui-ci
JP4659118B2 (ja) プラズマディスプレイパネルとその製造方法
JP4476334B2 (ja) プラズマディスプレイパネルとその製造方法
JP2004323576A (ja) 蛍光体およびプラズマディスプレイ装置
US8222814B2 (en) Plasma display panel with exposed crystal particles and manufacturing method thereof
JP2009170191A (ja) プラズマディスプレイパネルとその製造方法
JP4148983B2 (ja) プラズマディスプレイパネル
WO2011118152A1 (fr) Procédé de fabrication d'écran plasma
WO2010095344A1 (fr) Ecran plasma
WO2010122730A1 (fr) Panneau d'affichage à plasma et son procédé de fabrication
JP5028487B2 (ja) プラズマディスプレイパネル
WO2011138870A1 (fr) Panneau d'affichage à plasma
JP2009301841A (ja) プラズマディスプレイパネル
JP4569631B2 (ja) プラズマディスプレイ装置およびプラズマディスプレイ装置用緑色蛍光体材料の製造方法
JP2009301865A (ja) プラズマディスプレイパネル
WO2010095343A1 (fr) Panneau d'affichage à plasma
JP2010177072A (ja) プラズマディスプレイパネル
JP2011171221A (ja) プラズマディスプレイパネルとその製造方法
WO2011108260A1 (fr) Procédé de production d'un écran plasma
JP2011086426A (ja) プラズマディスプレイパネル
JP2010177073A (ja) プラズマディスプレイパネル

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10766793

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 10766793

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP