WO2010035487A1 - 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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- WO2010035487A1 WO2010035487A1 PCT/JP2009/004903 JP2009004903W WO2010035487A1 WO 2010035487 A1 WO2010035487 A1 WO 2010035487A1 JP 2009004903 W JP2009004903 W JP 2009004903W WO 2010035487 A1 WO2010035487 A1 WO 2010035487A1
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- oxide
- protective layer
- discharge
- dielectric layer
- peak
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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
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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
Definitions
- the present invention relates to a plasma display panel used for a display device or the like.
- PDPs Plasma display panels
- 100-inch class televisions and the like because they can realize high definition and large screens.
- PDPs are being applied to high-definition televisions having more than twice the number of scanning lines as compared to conventional NTSC systems.
- efforts to further reduce power consumption in response to energy problems and demands for PDPs that do not contain lead components in consideration of environmental problems are increasing.
- the PDP is basically composed of a front plate and a back plate.
- the front plate is a glass substrate of sodium borosilicate glass produced by the float process, a display electrode composed of a striped transparent electrode and a bus electrode formed on one main surface of the glass substrate, A dielectric layer that covers the display electrode and functions as a capacitor, and a protective layer made of magnesium oxide (MgO) formed on the dielectric layer.
- MgO magnesium oxide
- 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, The phosphor layer is formed between the barrier ribs and emits red, green and blue light.
- Neon (Ne) -xenon (Xe) discharge gas is 400 Torr (53300 Pa) to 600 Torr (80000 Pa) in the discharge space partitioned by the barrier ribs. ).
- 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 is doing.
- such a PDP driving method includes an initialization period in which wall charges are adjusted so that writing is easy, a writing period in which writing discharge is performed according to an input image signal, and a discharge space in which writing is performed.
- a driving method having a sustain period in which display is performed by generating a sustain discharge is generally used.
- a period (subfield) obtained by combining these periods is repeated a plurality of times within a period (one field) corresponding to one frame of an image, thereby performing PDP gradation display.
- the role of the protective layer formed on the dielectric layer of the front plate is to protect the dielectric layer from ion bombardment due to discharge and to emit initial electrons for generating address discharge.
- Etc. 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 pulse applied to the address electrode It is necessary to reduce the width.
- discharge delay there is a time lag called discharge delay from the rise of the voltage pulse to the occurrence of discharge in the discharge space. Therefore, if the pulse width is narrowed, the probability that the discharge can be completed within the writing period is lowered. As a result, lighting failure occurs, and the problem of deterioration in image quality performance such as flickering occurs.
- magnesium oxide (MgO) crystal particles are formed on the magnesium oxide (MgO) protective layer, it is possible to reduce the discharge delay and reduce the lighting failure. However, there is a problem that the discharge voltage cannot be reduced.
- the present invention has been made in view of such a problem, and realizes a PDP having high luminance display performance and capable of being driven at a low voltage.
- JP 2002-260535 A Japanese Patent Laid-Open No. 11-339665 JP 2006-59779 A JP-A-8-236028 JP-A-10-334809
- the PDP of the present invention includes a first substrate in which a dielectric layer is formed so as to cover a display electrode formed on the substrate and a protective layer is formed on the dielectric layer, and a discharge in which the first substrate is filled with a discharge gas.
- a PDP having a second substrate that is disposed to face each other so as to form a space and that has an address electrode in a direction intersecting with the display electrode and a partition wall that partitions the discharge space, the protective layer being made of magnesium oxide Formed with a metal oxide composed of calcium oxide, and the metal oxide has a diffraction angle at which a magnesium oxide peak occurs and a calcium oxide peak in the same direction as the peak in the X-ray diffraction analysis on the protective layer surface A peak is present between the diffraction angle and the concentration of calcium is 5 atomic% (hereinafter referred to as atm%) to 25 atm%, One, and has a peak of the crystal orientation (111) surface.
- a low voltage drive PDP can be realized.
- 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 configuration of the front plate of the PDP.
- FIG. 3 is a diagram showing an X-ray diffraction result in the protective layer of the PDP.
- FIG. 4 is a diagram showing the relationship between the concentration of calcium (Ca) in the metal oxide that is the protective layer of the PDP and the discharge sustaining voltage.
- FIG. 5 is a graph showing the relationship between the concentration of calcium (Ca) in the metal oxide that is the protective layer of the PDP and the discharge start voltage.
- FIG. 6 is an enlarged view for explaining the aggregated particles of the PDP.
- FIG. 7 is a graph showing the relationship between the discharge delay of the PDP and the calcium (Ca) concentration in the protective layer.
- FIG. 8 is a diagram showing the experimental results of examining the electron emission performance by changing the grain size of crystal grains in the PDP.
- FIG. 1 is a perspective view showing the structure of PDP 1 in the embodiment of the present invention.
- the basic structure of the PDP 1 is the same as that of a general AC surface discharge type PDP.
- the PDP 1 includes a first substrate (hereinafter referred to as a front plate 2) made of a front glass substrate 3 and the like, and a second substrate (hereinafter referred to as a back plate 10) made of a rear glass substrate 11 and the like.
- a front plate 2 made of a front glass substrate 3 and the like
- a second substrate hereinafter referred to as a back plate 10
- the discharge space 16 inside the sealed PDP 1 is filled with discharge gas such as xenon (Xe) and neon (Ne) at a pressure of 400 Torr (53300 Pa) to 600 Torr (80000 Pa).
- 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 is formed on the front glass substrate 3 so as to cover the display electrode 6 and the light-shielding layer 7 and hold a charge and function as a capacitor.
- a protective layer 9 is further formed thereon. Yes.
- 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.
- 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.
- a discharge space is formed at a position where the scan electrode 4 and the sustain electrode 5 intersect with the address electrode 12, and a discharge space having red, green, and blue phosphor layers 15 arranged in the direction of the display electrode 6 is used for color display. Become a pixel.
- FIG. 2 is a cross-sectional view showing the configuration of the front plate 2 of the PDP 1 in the embodiment of the present invention, and FIG. 2 is shown upside down from FIG.
- a display electrode 6 and a light shielding layer 7 including scanning electrodes 4 and sustaining electrodes 5 are formed in a pattern on a front glass substrate 3 manufactured by a float method or the like.
- 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 ), and the like, 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 mainly composed of 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.
- a protective layer 9 is formed on the second dielectric layer 82.
- the protective layer 9 is formed of a metal oxide composed of magnesium oxide and calcium oxide. Further, the protective layer 9 is formed by adhering agglomerated particles 92 in which a plurality of magnesium oxide (MgO) crystal particles 92 a are agglomerated.
- MgO magnesium oxide
- the scan electrode 4, the sustain electrode 5, and the light shielding layer 7 are formed on the front glass substrate 3.
- Transparent electrodes 4a and 5a and metal bus electrodes 4b and 5b constituting scan electrode 4 and sustain electrode 5 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.
- the metal bus electrodes 4b and 5b are solidified by baking a paste containing a silver (Ag) material at a predetermined temperature.
- the light shielding layer 7 is also formed by a method of screen printing a paste containing a black pigment, or a method of forming a black pigment on the entire surface of the glass substrate, patterning it using a photolithography method, and baking it.
- a dielectric paste is applied on the front glass substrate 3 by a die coating method so as to cover the scan electrode 4, the sustain electrode 5, and the light shielding layer 7, and a dielectric paste (dielectric material) layer (not shown) is applied.
- a dielectric paste dielectric material layer (not shown) is applied.
- 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 solidified by firing, thereby forming 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.
- the protective layer 9 is formed of a metal oxide composed of magnesium oxide (MgO) and calcium oxide (CaO).
- the protective layer 9 is formed by a thin film deposition method using pellets of a single material of magnesium oxide (MgO) or calcium oxide (CaO), or pellets obtained by mixing these materials.
- a thin film forming method a known method such as an electron beam evaporation method, a sputtering method, or an ion plating method can be applied.
- 1 Pa is considered as the upper limit of the pressure that can actually be taken in the sputtering method and 0.1 Pa in the electron beam evaporation method, which is an example of the evaporation method.
- the atmosphere during film formation of the protective layer 9 is adjusted to a predetermined electron emission characteristic by adjusting the atmosphere during film formation in a sealed state that is blocked from the outside in order to prevent moisture adhesion and impurity adsorption.
- a protective layer 9 made of a metal oxide can be formed.
- the crystal particles 92a can be manufactured by any of the following vapor phase synthesis method or precursor baking method.
- a magnesium metal material having a purity of 99.9% or more is heated in an atmosphere filled with an inert gas. Furthermore, by introducing a small amount of oxygen into the atmosphere, magnesium can be directly oxidized to produce magnesium oxide (MgO) crystal particles 92a.
- the crystal particles 92a can be produced by the following method.
- a magnesium oxide (MgO) precursor is uniformly fired under a temperature condition of 700 ° C. or higher, and this is gradually cooled to obtain magnesium oxide (MgO) crystal particles 92a.
- the precursor include magnesium alkoxide (Mg (OR) 2 ), magnesium acetylacetone (Mg (acac) 2 ), magnesium hydroxide (Mg (OH) 2 ), magnesium carbonate (MgCO 2 ), and magnesium chloride (MgCl 2 ).
- MgSO 4 Magnesium sulfate
- Mg (NO 3 ) 2 magnesium nitrate
- MgC 2 O 4 magnesium oxalate
- it may usually take the form of a hydrate, but such a hydrate may be used.
- MgO magnesium oxide
- these compounds are adjusted so that the purity of magnesium oxide (MgO) obtained after firing is 99.95% or more, preferably 99.98% or more.
- impurity elements such as various alkali metals, boron (B), silicon (Si), iron (Fe), aluminum (Al), This is because sintering occurs and it is difficult to obtain crystal grains 92a of highly crystalline magnesium oxide (MgO). Therefore, it is necessary to adjust the precursor in advance by removing the impurity element.
- the magnesium oxide (MgO) crystal particles 92a obtained by any of the above methods are dispersed in a solvent. Subsequently, the dispersion is sprayed on the surface of the protective layer 9 by spraying, screen printing, electrostatic coating, or the like. Thereafter, the solvent is removed through a drying / firing step, and the aggregated particles 92 in which a plurality of magnesium oxide (MgO) crystal particles 92 a are aggregated are fixed on the surface of the protective layer 9.
- the scanning electrode 4, the sustaining electrode 5, the light shielding layer 7, the dielectric layer 8, and the protective layer 9 are formed on the front glass substrate 3, and the front plate 2 is completed.
- the back plate 10 is formed as follows. First, the structure for the address electrode 12 is formed by a method of screen printing a paste containing silver (Ag) material on the rear glass substrate 11 or a method of patterning using a photolithography method after forming a metal film on the entire surface. A material layer (not shown) to be an object is formed. Thereafter, the address layer 12 is formed by firing the material layer at a predetermined temperature. Next, a dielectric paste is applied on 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. Thereafter, 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 barrier rib forming paste containing barrier rib material is applied on the underlying dielectric layer 13 and patterned into a predetermined shape to form a barrier rib material layer (not shown).
- the partition wall 14 is formed by firing the partition wall material layer at a predetermined temperature.
- a photolithography method or a sand blast method can be used as a method of patterning the partition wall paste applied on the base dielectric layer 13.
- the phosphor layer 15 is formed by applying and baking 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.
- a front plate 2 and a rear plate 10 having predetermined constituent members are arranged so as 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, and xenon (Xe ) And neon (Ne) and the like are enclosed, and the PDP 1 is completed.
- the dielectric material of the first dielectric layer 81 is composed of the following material composition. That is, 20% by weight to 40% by weight of bismuth oxide (Bi 2 O 3 ), 0.5% by weight to 12% of at least one selected from calcium oxide (CaO), strontium oxide (SrO), and barium oxide (BaO). 1% by weight to 7% by weight of at least one selected from molybdenum oxide (MoO 3 ), tungsten oxide (WO 3 ), cerium oxide (CeO 2 ), and manganese dioxide (MnO 2 ). .
- MoO 3 molybdenum oxide
- tungsten oxide (WO 3 ) tungsten oxide
- CeO 2 cerium oxide
- manganese dioxide (MnO 2 ) manganese dioxide
- CuO copper oxide
- Cr 2 O 3 chromium oxide
- 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% to 40 wt%
- boron oxide (B 2 O 3 ) is 0 wt% to 35 wt%
- silicon oxide (SiO 2 ) is 0 wt% to A material composition that does not contain a lead component, such as 15 wt% and aluminum oxide (Al 2 O 3 ) 0 wt% to 10 wt% may be included.
- a dielectric material powder is prepared by pulverizing a dielectric material composed of these composition components with a wet jet mill or a ball mill so that the particle diameter becomes 0.5 ⁇ m to 2.5 ⁇ m. Next, 55 wt% to 70 wt% of the dielectric material powder and 30 wt% to 45 wt% of the binder component are well kneaded with three rolls to paste for the first dielectric layer 81 for die coating or printing. Is made.
- the binder component is ethyl cellulose, terpineol containing 1% 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 printing property may be improved as a paste by adding a phosphate ester of an alkyl allyl group, etc.
- 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.
- the first dielectric layer 81 is formed by baking at a temperature of 575 ° C. to 590 ° C.
- the dielectric material of the second dielectric layer 82 is composed of the following material composition. That is, 11% by weight to 20% by weight of bismuth oxide (Bi 2 O 3 ), and 1.6% by weight of at least one selected from calcium oxide (CaO), strontium oxide (SrO), and barium oxide (BaO). And 21 wt%, and 0.1 wt% to 7 wt% of 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
- CuO copper oxide
- Cr 2 O 3 chromium oxide
- Co 2 O 3 cobalt oxide
- 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% to 40 wt%
- boron oxide (B 2 O 3 ) is 0 wt% to 35 wt%
- silicon oxide (SiO 2 ) is 0 wt% to A material composition that does not contain a lead component, such as 15 wt% and aluminum oxide (Al 2 O 3 ) 0 wt% to 10 wt% may be included.
- a dielectric material powder is prepared by pulverizing a dielectric material composed of these composition components with a wet jet mill or a ball mill so that the particle diameter becomes 0.5 ⁇ m to 2.5 ⁇ m. Next, 55 wt% to 70 wt% of the dielectric material powder and 30 wt% to 45 wt% of the binder component are well kneaded with three rolls to form a second dielectric layer paste for die coating or printing. Make it.
- the binder component is ethyl cellulose, terpineol containing 1% to 20% by weight of acrylic resin, or butyl carbitol acetate.
- dioctyl phthalate, dibutyl phthalate, triphenyl phosphate, and tributyl phosphate are added as plasticizers as needed, and glycerol monooleate, sorbitan sesquioleate, and homogenol (Kao Corporation) as dispersants.
- the printability may be improved by adding a phosphoric ester of an alkyl allyl group or the like.
- the film thickness of the dielectric layer 8 is preferably set to 41 ⁇ m or less in total of the first dielectric layer 81 and the second dielectric layer 82 in order to ensure visible light transmittance.
- the second dielectric layer 82 is less likely to be colored when the content of bismuth oxide (Bi 2 O 3 ) is 11% by weight or less, but bubbles are likely to be generated in the second dielectric layer 82. Therefore, it is not preferable. On the other hand, if the content exceeds 40% by weight, coloration tends to occur, and the transmittance decreases.
- the thickness of the dielectric layer 8 is set to 41 ⁇ m or less, the first dielectric layer 81 is set to 5 ⁇ m to 15 ⁇ m, and the second dielectric layer 82 is set to 20 ⁇ m to 36 ⁇ m. Yes.
- the front glass substrate 3 has little coloring phenomenon (yellowing), and bubbles are generated in the dielectric layer 8. It has been confirmed that the dielectric layer 8 excellent in withstand voltage performance is realized.
- the reason why yellowing and bubble generation are suppressed in the first dielectric layer 81 by these dielectric materials will be considered. That is, by adding molybdenum oxide to the dielectric glass containing bismuth oxide (Bi 2 O 3) (MoO 3), or tungsten oxide (WO 3), Ag 2 MoO 4, Ag 2 Mo 2 O 7, Ag 2 It is known that 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 easily generated at a low temperature of 580 ° C. or lower. In the embodiment of the present invention, since the firing temperature of the dielectric layer 8 is 550 ° C.
- silver ions (Ag + ) diffused into 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 and stabilize a stable compound. 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.
- MoO 3 molybdenum oxide
- WO 3 tungsten oxide
- CeO 2 cerium oxide
- MnO 2 manganese oxide
- manganese (MnO 2 ) is preferably 0.1% by weight or more, but more preferably 0.1% by weight or more and 7% by weight or less. In particular, when the amount is less than 0.1% by weight, the effect of suppressing yellowing is small.
- the dielectric layer 8 of the PDP 1 in the embodiment of the present invention suppresses yellowing and bubble generation in the first dielectric layer 81 in contact with the metal bus electrodes 4b and 5b made of silver (Ag) material. .
- a high light transmittance is realized by the second dielectric layer 82 provided on the first dielectric layer 81. As a result, it is possible to realize a PDP having a high transmittance with very few bubbles and yellowing as the entire dielectric layer 8.
- the protective layer 9 is composed of a metal oxide formed by electron beam evaporation using magnesium oxide (MgO) and calcium oxide (CaO) as raw materials. Furthermore, in the X-ray diffraction analysis on the surface of the protective layer 9, the metal oxide has a diffraction angle at which a magnesium oxide (MgO) peak occurs and calcium oxide (CaO) having the same plane orientation as the magnesium oxide (MgO) peak. In addition to the diffraction angle at which this peak occurs, the concentration of calcium (Ca) is not less than 5 atm% and not more than 25 atm%, and the crystal orientation (111) plane has a peak.
- MgO magnesium oxide
- CaO calcium oxide
- FIG. 3 is a diagram showing an X-ray diffraction analysis result on the surface of the protective layer 9 of the PDP 1 and an X-ray diffraction analysis result of magnesium oxide (MgO) and calcium oxide (CaO) alone in the embodiment of the present invention.
- MgO magnesium oxide
- CaO calcium oxide
- the horizontal axis represents the Bragg diffraction angle (2 ⁇ ), and the vertical axis represents the intensity of the X-ray diffraction wave.
- the unit of the diffraction angle is shown in degrees when one round is 360 degrees, and the intensity is shown in an arbitrary unit (arbitrary unit).
- the crystal plane orientations are shown in parentheses.
- the diffraction angle on the (111) plane of calcium oxide (CaO) alone has a peak at 32.2 degrees.
- unit has a peak at 36.9 degree
- the diffraction angle at the (200) plane of calcium oxide (CaO) alone has a peak at 37.3 degrees.
- unit has a peak in 42.8 degree
- X-rays of the protective layer 9 in the embodiment of the present invention formed by a thin film deposition method using pellets of a single material of magnesium oxide (MgO) or calcium oxide (CaO) or pellets obtained by mixing those materials.
- the diffraction analysis results are points A and B in FIG.
- the metal oxide may be oriented in both the crystal orientation (111) plane and the crystal orientation (200) plane. In that case, as the metal oxide, the intensity Da at the peak A point on the crystal orientation (111) plane is made larger than the intensity Db at the peak B point on the crystal orientation (200) plane.
- the diffraction angle at the (111) plane of the metal oxide constituting the protective layer 9 according to the embodiment of the present invention is A between the diffraction angles of each of magnesium oxide (MgO) and calcium oxide (CaO). There is a peak at the point of 36.1 degrees. Further, the diffraction angle on the (200) plane has a peak at 41.9 degrees, which is a B point between the diffraction angles of magnesium oxide (MgO) and calcium oxide (CaO).
- the energy level of the metal oxide having such an X-ray diffraction analysis result also exists between magnesium oxide (MgO) and calcium oxide (CaO).
- the protective layer 9 exhibits better secondary electron emission characteristics compared to magnesium oxide (MgO) alone. Therefore, in particular, when the partial pressure of xenon (Xe) as the discharge gas is increased in order to increase the luminance, it becomes possible to reduce the discharge voltage and realize a low-voltage and high-luminance PDP.
- FIG. 4 shows the concentration of calcium (Ca) in the metal oxide that is the protective layer 9 made of magnesium oxide (MgO) and calcium oxide (CaO) in the PDP 1 according to the embodiment of the present invention, and the discharge sustaining voltage. It is a figure which shows a relationship.
- the calcium (Ca) concentration is estimated from the peak shift width of the X-ray diffraction analysis of the calcium (Ca) and magnesium (Mg) components in the metal oxide, and the calcium (Ca) concentration is expressed in terms of atm%. is doing.
- the discharge sustain voltage on the vertical axis is shown with reference to the discharge sustain voltage when the protective layer 9 is composed of only magnesium oxide (MgO).
- the discharge sustaining voltage was measured in a mixed gas of xenon (Xe) and neon (Ne) (xenon (Xe) partial pressure was 15%).
- the discharge sustaining voltage of the PDP 1 varies depending on the concentration of calcium (Ca) of the metal oxide in the protective layer 9. That is, when the concentration of calcium (Ca) is increased, the discharge sustaining voltage tends to be lower than that of the protective layer 9 composed only of magnesium oxide (MgO), and tends to increase when the concentration exceeds a predetermined concentration. Become. As apparent from FIG. 4, when the calcium (Ca) concentration is in the range of 5 atomic% to 25 atomic%, the value of the sustaining voltage is higher than that of the PDP using the protective layer 9 of magnesium oxide (MgO) alone. Can be reduced by about 5% or more.
- the discharge sustaining voltage can be further reduced, compared with a PDP using the protective layer 9 made of magnesium oxide (MgO) alone.
- the value of the sustaining voltage can be lowered by about 10% or more.
- the luminance is increased by increasing the partial pressure of xenon (Xe), and the increase in the discharge sustaining voltage at this time is increased. It can be reduced by the protective layer 9 in the embodiment of the invention. As a result, it is possible to realize a PDP 1 that can be driven with high brightness and low voltage.
- the discharge start voltage shows the same tendency as the discharge sustain voltage, and when the calcium (Ca) concentration is in the range of 5 atm% to 25 atm%, the protective layer of magnesium oxide (MgO) alone Compared with the PDP using 9, the value of the discharge start voltage can be reduced by about 5% or more. Further, when the calcium (Ca) concentration is in the range of 10 atm% to 20 atm%, the discharge start voltage can be further reduced, compared with a PDP using a protective layer 9 of magnesium oxide (MgO) alone. About 10% or more.
- the reason why the protective layer 9 in the embodiment of the present invention can reduce the sustaining voltage is considered to be due to the band structure of each metal oxide.
- the protective layer 9 in the embodiment of the present invention contains magnesium oxide (MgO) and calcium oxide (CaO) as main components, and in the X-ray diffraction analysis, magnesium oxide (MgO) as these main components. A peak exists between the diffraction angles of calcium oxide (CaO) alone.
- the energy level of the metal oxide film has a synthesized property of magnesium oxide (MgO) and calcium oxide (CaO). Therefore, the energy level of the protective layer 9 also exists between magnesium oxide (MgO) and calcium oxide (CaO) alone, and the amount of energy acquired by other electrons due to the Auger effect is released beyond the vacuum level. Sufficient amount. As a result, the protective layer 9 can exhibit better secondary electron emission characteristics as compared with magnesium oxide (MgO) alone, and as a result, the discharge sustaining voltage can be reduced.
- MgO magnesium oxide
- CaO calcium oxide
- strontium oxide (SrO) and barium oxide (BaO) exist in a shallow region in terms of the band structure as compared with magnesium oxide (MgO) in depth from the vacuum level. Therefore, even when these materials are used instead of calcium oxide (CaO), the same effect can be exhibited.
- the protective layer 9 contains calcium oxide (CaO) and magnesium oxide (MgO) as main components, and in the X-ray diffraction analysis, these protective components 9 and magnesium oxide (MgO) are oxidized. Since a peak exists between the diffraction angles of calcium (CaO) alone, it is formed with a crystal structure with few impurity contamination and oxygen vacancies. For this reason, excessive emission of electrons during driving of the PDP is suppressed, and in addition to the effect of achieving both low voltage driving and secondary electron emission performance, the effect of having appropriate charge retention performance is also exhibited. This charge holding performance is necessary particularly for holding wall charges stored in the initialization period and preventing writing failure in the writing period and performing reliable writing discharge.
- CaO calcium oxide
- MgO magnesium oxide
- the agglomerated particles 92 in which a plurality of magnesium oxide (MgO) crystal particles 92a provided on the protective layer 9 are agglomerated in the embodiment of the present invention will be described in detail.
- the aggregated particles 92 mainly have an effect of suppressing the discharge delay in the write discharge and an effect of improving the temperature dependence of the discharge delay. That is, the agglomerated particles 92 have higher initial electron emission characteristics than the protective layer 9. Therefore, in the embodiment of the present invention, the agglomerated particles 92 are disposed as an initial electron supply unit necessary at the time of discharge pulse rising.
- the PDP 1 in the embodiment of the present invention includes the protective layer 9 that achieves both low voltage driving and charge retention, and the magnesium oxide (MgO) aggregated particles 92 that exhibit the effect of preventing discharge delay. . For this reason, even when the PDP 1 is high definition, it can be driven at high speed with a low voltage. In addition, high-quality image display performance with suppressed lighting failure can be expected.
- MgO magnesium oxide
- FIG. 6 is an enlarged view for explaining the aggregated particles 92 provided on the protective layer 9 of the PDP 1 in the embodiment of the present invention.
- Aggregated particles 92 are those in which crystal particles 92a having a predetermined primary particle size are aggregated, as shown in FIG. That is, they are not bonded as a solid with a large bonding force.
- a plurality of primary particles are aggregated by static electricity or van der Waals force.
- the aggregated particles 92 are bonded with such a force that a part or all of them are decomposed into primary particles when an external force such as ultrasonic waves is applied.
- 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 particle size of the primary particles of the crystal particles 92a can be controlled by the generation conditions of the crystal particles 92a.
- the particle size can be controlled by controlling the firing temperature and firing atmosphere.
- the firing temperature can be selected in the range of 700 ° C. to 1500 ° C., but the primary particle size can be controlled to about 0.3 ⁇ m to 2 ⁇ m by setting the firing temperature to 1000 ° C. or higher.
- the crystal particle 92a is obtained by heating the MgO precursor, a plurality of primary particles are aggregated to obtain the aggregated particle 92 in the production process.
- FIG. 7 is a diagram showing the relationship between the discharge delay of the PDP 1 and the calcium (Ca) concentration in the protective layer 9 in the embodiment of the present invention.
- the protective layer 9 is made of a metal oxide composed of magnesium oxide (MgO) and calcium oxide (CaO). Furthermore, the metal oxide has a peak between the diffraction angle at which the magnesium oxide (MgO) peak occurs and the diffraction angle at which the calcium oxide (CaO) peak occurs in the X-ray diffraction analysis on the surface of the protective layer 9. Like to do.
- FIG. 7 shows the case where only the base film 91 is used as the protective layer 9 and the case where the aggregated particles 92 are arranged on the base film 91. Further, the discharge delay is shown based on the case where calcium (Ca) is not contained in the base film 91.
- the electron emission performance is a numerical value indicating that the larger the electron emission performance, the greater the amount of electron emission.
- the initial electron emission amount can be measured by a method of measuring the amount of electron current emitted from the surface by irradiating the surface with ions or an electron beam, it is difficult to evaluate the front surface of the PDP in a non-destructive manner. Accompanied by. Therefore, the method described in JP 2007-48733 A was used. That is, among the delay times at the time of discharge, a numerical value called a statistical delay time, which is a measure of the likelihood of occurrence of discharge, is measured, and when the reciprocal is integrated, a numerical value corresponding to the initial electron emission amount is obtained. Therefore, this numerical value is used for evaluation.
- the delay time at the time of discharge means the time of the delay of discharge that is delayed after the rise of the pulse, and the discharge delay is the time when the initial electrons that trigger when the discharge starts from the surface of the protective layer to the discharge space. It is considered that the main factor is that it is difficult to be released.
- the discharge delay increases as the calcium (Ca) concentration increases.
- the discharge delay can be greatly reduced.
- the discharge delay hardly increases.
- the particle size of the aggregated particles 92 used in the protective layer 9 of the PDP 1 according to the embodiment of the present invention will be described.
- the particle diameter means an average particle diameter
- the average particle diameter means a volume cumulative average diameter (D50).
- FIG. 8 is a characteristic diagram showing an experimental result of examining the electron emission performance by changing the particle size of the aggregated particles 92 in the PDP 1 according to the embodiment of the present invention.
- the particle size of the aggregated particles 92 was measured by observing the aggregated particles 92 with SEM. As shown in FIG. 8, it can be seen that when the particle size is reduced to about 0.3 ⁇ m, the electron emission performance is lowered, and when it is approximately 0.9 ⁇ m or more, high electron emission performance is obtained.
- the number of crystal particles 92a per unit area on the protective layer 9 is large.
- the agglomerated particles 92 are present in a portion corresponding to the top portion of the partition wall 14 in close contact with the protective layer 9, the top portion of the partition wall 14 is damaged.
- the damaged partition wall material may get on the phosphor layer 15. As a result, it has been found that a phenomenon occurs in which the corresponding cell does not normally turn on or off.
- the phenomenon of the partition wall breakage is unlikely to occur unless the aggregated particles 92 are present in the portion corresponding to the top of the partition wall 14, so that the probability of the partition wall 14 being broken increases as the number of aggregated particles 92 to be attached increases. .
- the aggregated particle diameter is increased to about 2.5 ⁇ m, the probability of partition wall breakage increases rapidly.
- the aggregated particle diameter is smaller than 2.5 ⁇ m, the probability of partition wall breakage can be kept relatively small.
- the above-described effects of the present invention can be obtained by using the agglomerated particles 92 having a particle size in the range of 0.9 ⁇ m to 2 ⁇ m.
- magnesium oxide (MgO) particles have been described as crystal particles.
- other single crystal particles also have strontium oxide (electron emission characteristics) having high electron emission performance like magnesium oxide (MgO).
- strontium oxide electron emission characteristics
- the same effect can be obtained by using metal oxide crystal particles such as SrO), calcium oxide (CaO), barium oxide (BaO), and aluminum oxide (Al 2 O 3 ).
- the particle type is not limited to magnesium oxide (MgO).
- the invention is useful for realizing a PDP having high image quality display performance and low power consumption.
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Abstract
Description
図1は本発明の実施の形態におけるPDP1の構造を示す斜視図である。PDP1の基本構造は、一般的な交流面放電型PDPと同様である。図1に示すように、PDP1は前面ガラス基板3などよりなる第1基板(以下、前面板2と呼ぶ)、と、背面ガラス基板11などよりなる第2基板(以下、背面板10と呼ぶ)とが対向して配置され、その外周部をガラスフリットなどからなる封着材によって気密封着されている。封着されたPDP1内部の放電空間16には、キセノン(Xe)とネオン(Ne)などの放電ガスが400Torr(53300Pa)~600Torr(80000Pa)の圧力で封入されている。
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
81 第1誘電体層
82 第2誘電体層
92 凝集粒子
92a 結晶粒子
Claims (3)
- 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前記誘電体層上に保護層を形成した第1基板と、前記第1基板に放電ガスが充填された放電空間を形成するように対向配置され、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を設けた第2基板とを有するプラズマディスプレイパネルであって、
前記保護層は酸化マグネシウムと酸化カルシウムからなる金属酸化物により形成され、かつ、前記金属酸化物は、前記保護層面におけるX線回折分析において、前記酸化マグネシウムのピークが発生する回折角と、前記ピークと同一方位の前記酸化カルシウムのピークが発生する回折角との間にピークが存在するとともに、カルシウムの濃度を5atomic%以上25atomic%以下とし、かつ、結晶方位(111)面のピークを有することを特徴とするプラズマディスプレイパネル。 - 前記金属酸化物のカルシウムの濃度が10atomic%以上20atomic%以下であることを特徴とする請求項1に記載のプラズマディスプレイパネル。
- 前記保護層の前記放電空間側に、酸化マグネシウムの結晶粒子が複数個凝集した凝集粒子を付着させたことを特徴とする請求項1に記載のプラズマディスプレイパネル。
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KR1020107003856A KR101104982B1 (ko) | 2008-09-29 | 2009-09-28 | 플라즈마 디스플레이 패널 |
US12/674,518 US8188661B2 (en) | 2008-09-29 | 2009-09-28 | Plasma display panel capable of displaying a video having high brightness while requiring a low driving voltage |
EP09807699A EP2343723A4 (en) | 2008-09-29 | 2009-09-28 | PLASMA DISPLAY PANEL |
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JP2009003208A JP2010103077A (ja) | 2008-09-29 | 2009-01-09 | プラズマディスプレイパネル |
JP2009-003208 | 2009-01-09 |
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EP (1) | EP2343723A4 (ja) |
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US20120013248A1 (en) * | 2010-03-01 | 2012-01-19 | Kyohei Yoshino | Plasma display panel |
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- 2009-01-09 JP JP2009003208A patent/JP2010103077A/ja active Pending
- 2009-09-28 WO PCT/JP2009/004903 patent/WO2010035487A1/ja active Application Filing
- 2009-09-28 EP EP09807699A patent/EP2343723A4/en not_active Withdrawn
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