WO2004049375A1 - プラズマディスプレイパネルとその製造方法 - Google Patents
プラズマディスプレイパネルとその製造方法 Download PDFInfo
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- WO2004049375A1 WO2004049375A1 PCT/JP2003/014349 JP0314349W WO2004049375A1 WO 2004049375 A1 WO2004049375 A1 WO 2004049375A1 JP 0314349 W JP0314349 W JP 0314349W WO 2004049375 A1 WO2004049375 A1 WO 2004049375A1
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- WIPO (PCT)
- Prior art keywords
- crystal
- plasma display
- protective layer
- display panel
- magnesium oxide
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Classifications
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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
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- 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
Definitions
- the present invention relates to a method for manufacturing a gas discharge panel such as a plasma display panel, and more particularly to a technique for modifying a dielectric layer.
- a plasma display panel (hereinafter, referred to as a PDP) is a gas discharge panel that displays images by exciting and emitting phosphors with ultraviolet light generated by gas discharge.
- PDPs can be classified into alternating current (AC) and direct current (DC) types based on the method of forming the discharge.
- the AC type is superior to the DC type in terms of brightness, luminous efficiency, and lifespan. The most common.
- the AC type PDP is composed of a plurality of electrodes (display electrodes or address electrodes) and two thin panel glasses, each of which is provided with a dielectric layer so as to cover the electrodes, facing each other through a plurality of partition walls.
- a phosphor layer is arranged between the partition walls, and discharge cells (sub-pixels) are formed in a matrix shape.
- a discharge gas is sealed between both panel glasses.
- a protective layer (film) is formed on the surface of the dielectric layer covering the display electrodes. It is desirable that the characteristics of the protective layer have high characteristics to reduce both the firing voltage Vf (Firing Voltage) and the occurrence of discharge variation for each discharge cell.
- the MgO crystal film is an insulator having excellent sputter resistance and a large secondary electron emission coefficient, and is a suitable material for the protective layer.
- the plurality of electrodes are appropriately supplied with power to obtain a discharge in a discharge gas to emit fluorescent light.
- the frame to be displayed is first divided into a plurality of subframes, and each subframe is further divided into a plurality of periods.
- the wall charge of the entire screen is initialized (reset) during the initialization period, and then the address discharge is performed to accumulate the wall charge only in the discharge cells to be lit during the address period.
- the discharge maintenance period The discharge is maintained for a certain period of time by applying an AC voltage (sustain voltage) to the fuel cell simultaneously.
- the discharge probability basically has a characteristic of having a variation. Therefore, according to the property of ::, for example, in an address discharge, the discharge probability can be increased in proportion to the applied pulse width for executing the address discharge.
- PDP The general structure of a PDP is disclosed in, for example, Japanese Patent Application Laid-Open No. 9-192133.
- the protective layer made of MgO is also used to realize low-voltage operation, but has the property that the operating voltage is higher than that of liquid crystal display devices.
- high-voltage transistors are required for driving integrated circuits, which is one of the factors that raises the cost of PDPs. For this reason, it is now required to reduce the firing voltage Vf to reduce the power consumption of the PDP, and to refrain from using costly high-voltage transistors.
- the MgO film forming the protective layer is formed by a thin film forming method such as a vacuum evaporation method, an EB method, or a sputtering method, or by a printing method using an organic material that is a precursor of MgO (thick film forming method). ) Etc.
- a liquid organic material is mixed with a glass material, which is spin-coated on a panel glass surface and fired at around 600 ° C. By doing so, MgO is crystallized to form a protective layer.
- the printing method has advantages that the process is relatively simple and can be performed at low cost compared to the vacuum evaporation method, the EB method, and the sputtering method, and the throughput can be reduced because the vacuum process is not required. Excellent in terms of aspect.
- the protection layer formed by the thick film formation method has almost no difference in the effect of reducing the firing voltage Vf when compared with the protection layer formed by the vacuum process in the thin film formation method. Dispersion tends to occur.
- This variation in discharge causes so-called “black noise”, which is a cause that makes it difficult to obtain good image display performance, and is a problem that needs to be improved.
- the black noise indicates the discharge cells to be lit (selected discharge (Cell) does not light up, and tends to occur at the boundary between the lighted area and the non-lighted area on the screen.
- Select discharge selected discharge
- the cause of the black noise is that the address discharge does not occur or the intensity is insufficient even if it occurs. It is known that the cause is closely related to the electrons emitted from magnesium oxide.
- the problem concerning the variation in the discharge of the PDP is not limited to the case where the protective layer is formed by using the thick film forming method, and the thin film forming method is also protected by the oxygen deficient portion (ie, oxygen-rich) MgO. Since such a layer is likely to occur when a layer is formed, an urgent solution is required in both cases of forming a film using a method of forming a thick film or a thin film.
- the present invention has been made in view of the above problems, and is intended to reduce the discharge start voltage Vf and the occurrence of discharge variations efficiently while driving at a relatively low cost. And excellent image display performance
- the purpose is to provide a PDP and its manufacturing method. Disclosure of the invention
- the present invention provides a plasma display panel in which a first substrate on which a protective layer is formed is disposed to face a second substrate via a discharge space, and the periphery of both substrates is sealed. Wherein a first material and a second material having mutually different electron emission characteristics are exposed to the discharge space on the surface of the protective layer, and at least one of the first material and the second material. One is assumed to be dispersed.
- the first material is a first crystal
- the second material is a second crystal
- the second crystal is included in the first crystal on the surface of the protective layer. May be configured to be dispersed.
- the protective layer may be mainly composed of magnesium oxide, and the second crystalline body may be composed of magnesium oxide crystal fine particles.
- the first crystal can be obtained by firing a magnesium oxide precursor.
- the discharge starting voltage Vf of the protective layer is reduced by the magnesium oxide crystal as the first crystal and the magnesium oxide crystal fine particles as the second crystal. It is exerted by both.
- the discharge gas is excited by the electric field generated inside the discharge space, and when the rare gas atoms in the discharge gas approach the surface of the protective layer, a so-called Auger process occurs, and electrons in the valence band in the protective layer are generated. This causes another electron in the protective layer to be released to the discharge space. As a result, the secondary electron emission characteristics are satisfactorily exhibited, so that the discharge starting voltage is reduced.
- the potential emission of electrons by the protective layer can provide a sufficient secondary electron emission characteristic (a) as the performance required for the protective layer even if the electron emission characteristics of the magnesium oxide crystal are somewhat poor. From this, the magnesium oxide crystal of the present invention has a sufficient effect even if a low-cost magnesium oxide precursor used for forming a protective layer in a coating step by a thick film forming method is used. can get.
- magnesium oxide crystal fine particles having a high-purity crystal structure and excellent electron emission characteristics are exhibited by magnesium oxide crystal fine particles having a high-purity crystal structure and excellent electron emission characteristics. That is, when an electric field is generated in the discharge space, the vacuum ultraviolet rays (VUV) first cause electrons in the magnesium crystal fine particles to transition to oxygen-deficient portions. Then, the oxygen deficient portion acts as a light emission center due to a difference in electron energy in the oxygen deficient portion, and emits visible light. With this emission of visible light, electrons are excited in the magnesium crystal fine particles from the valence band to the energy level (impurity level) near the conduction band. By increasing the number of electrons at the impurity level, the carrier concentration of the protective layer is improved, and the impedance is controlled.
- VUV vacuum ultraviolet rays
- FIG. 1 is a partial cross-sectional view showing a main configuration of the PDP according to the first embodiment.
- FIG. 2 is a diagram showing an example of a PDP driving process.
- FIG. 3 is a diagram showing a configuration of a protective layer according to the first embodiment.
- FIG. 4 is a diagram illustrating a configuration of a protective layer according to the second embodiment.
- Figure 5 is an energy band diagram of the protective layer.
- FIG. 6 is a partial cross-sectional view showing a main configuration of a PDP according to the third embodiment.
- FIG. 7 is a diagram showing photoelectron spectroscopy data of MgO and A1.
- Figure 8 shows the energy bands of magnesium oxide and A1.
- FIG. 9 is a configuration diagram of a protective layer made of a composite of magnesium oxide and other materials or a composite material.
- FIG. 10 is a partial cross-sectional view illustrating a main configuration of a PDP according to the fourth embodiment. Preferred mode for carrying out the invention
- FIG. 1 is a partial cross-sectional perspective view showing a main configuration of an AC PDP 1 according to Embodiment 1 of the present invention.
- the z direction corresponds to the thickness direction of the PDP1
- the xy plane corresponds to a plane parallel to the panel surface of the PDP1.
- the PDP1 is, for example, a specification conforming to the NTSC specification of the 42-inch class.
- the present invention may of course be applied to other specifications and sizes such as XGA and SXGA.
- the configuration of the PDP 1 is roughly divided into a front panel 10 and a back panel 16 arranged with their main surfaces facing each other.
- a front panel glass 11 serving as a substrate of the front panel 10 has a plurality of pairs of display electrodes 12 and 13 (scan electrodes 12 and sustain electrodes 13) formed on one main surface thereof.
- the bus lines 121 and 131 reduce the sheet resistance of the transparent electrodes 120 and 130.
- the dielectric layer 14 has a current limiting function peculiar to the AC type PDP.
- a protective layer 15 having a thickness of about 1.0 m is sequentially coated.
- the protective layer 15 is made of magnesium oxide having two types of structures having different electron emission characteristics. That is, as shown in the front view of the protective layer in FIG. 3, the surface portion of the protective layer 15 exposed to the discharge space 24 described later has a magnesium oxide crystal as a first material obtained by firing a precursor of an organic material. Magnesium oxide crystal microparticles 15B are dispersed and present as a second material which is preliminarily crystallized before firing of the precursor and the precursor 15A.
- both the magnesium oxide crystal 15A and the magnesium oxide crystal fine particles 15B can lower the discharge starting voltage Vf satisfactorily, while the magnesium oxide crystal fine particles 15B allow the protection layer 15 to be formed. Good image display performance due to high electron emission characteristics It will be. Details of this effect will be described later.
- the back panel glass 17 serving as a substrate for the knock panel 16 has a Ag thick film (2 m to 10 m in thickness), an aluminum (A1) thin film (0.1 mm ni to lm) or Cr / Cu / Cr laminated thin films (thickness 0.1 ⁇ m to lm) and a plurality of address electrodes 18 with a width of 60 m are arranged at regular intervals (360 ⁇ m) in the y direction with the x direction as the longitudinal direction.
- a dielectric film 19 having a thickness of 30 is coated on the entire surface of the back panel glass 17 so as to include the address electrodes 18 in a stripe shape.
- a partition wall 20 (about 150 m in height and 40 m in width) is arranged in accordance with the gap between the adjacent address electrodes 18, and the sub-pixel SU is formed by the adjacent partition wall 20.
- the phosphor layers corresponding to red (R), green (G), and blue (b) for color display are provided on the side surfaces of two adjacent partition walls 20 and the surface of the dielectric film 19 therebetween. 21 to 23 are formed.
- address electrode 18 may be directly included in the phosphor layers 21 to 23 without using the dielectric film 19.
- the front panel 10 and the back panel 16 are arranged with the address electrode 18 and the display electrodes 12 and 13 facing each other so that the longitudinal directions thereof are orthogonal to each other, and the outer peripheral edges of both panels 10 and 16 are glass-flipped. Sealed with.
- a discharge gas (filled gas) composed of an inert gas component such as He, Xe, or Ne is sealed between the panels 10 and 16 at a predetermined pressure (usually about 53.2 kPa to 79.8 kPa).
- a discharge space 24 is formed between adjacent partition walls 20, and a region where a pair of adjacent display electrodes 12 and 13 and one address electrode 18 intersect with the discharge space 24 interposed therebetween is a sub-pixel for image display.
- the cell pitch is 1080 ⁇ m in the X direction and 360 m in the y direction.
- One pixel (1080 mx 1080 m) is composed of three adjacent RGB sub-pixels SU.
- the PDP1 with the above configuration supplies power to the display electrodes 12, 13 and the address electrode 18. It is driven by a driving unit (not shown). During driving for image display, an AC voltage of several tens of kHz to several hundreds of kHz is applied to the gap between the pair of display electrodes 12 and 13 to generate a discharge in the sub-pixel SU, and the excited Xe atoms are removed. The ultraviolet rays excite the phosphor layers 21 to 23 to emit visible light.
- each frame F of a time series which is an externally input image is, for example, Divide into six subframes. Weight is set so that the relative ratio of luminance in each subframe is, for example, 1: 2: 4: 8: 16: 32, and the number of times of sustain (sustain discharge) of each subframe is set.
- FIG. 2 shows an example of the driving waveform process of the present PDP1.
- the driving waveform of the m-th subframe in the frame is shown.
- each subframe is assigned an initialization period, an address period, a sustaining period, and an erasing period.
- the initialization period is a period in which the wall charges on the entire screen are erased (initialization discharge) to prevent the effects of the previous cell lighting (accumulated wall charges).
- a reset pulse having a positive falling ramp waveform exceeding the discharge start voltage Vf is applied to all the display electrodes 12 and 13.
- a positive pulse is applied to all the address electrodes 18 in order to prevent charging and ion impact on the knock panel 16 side.
- the initializing discharge which is a weak surface discharge, occurs in all cells due to the differential voltage between the rising and falling edges of the applied pulse, wall charges are accumulated in all cells, and the entire screen is uniformly charged.
- the address period is a period in which the selected cell is addressed (lighting / non-lighting setting) based on the image signal divided into subframes.
- the scan electrode 12 is biased to a positive potential with respect to the ground potential, and all the sustain electrodes 13 are biased to a negative potential.
- each line is selected one by one from the line at the top of the panel (one row of cells corresponding to a pair of display electrodes), and the corresponding scan electrode is selected.
- a scan pulse of negative polarity is applied to.
- a positive address pulse is applied to the address electrode 18 corresponding to the cell to be turned on.
- the discharge sustaining period is a period in which the lighting state set by the address discharge is expanded and sustained in order to secure luminance according to the gradation level.
- all the address electrodes 18 are biased to a positive potential, and a positive sustain pulse is applied to all the sustain electrodes 13. Thereafter, a sustain pulse is alternately applied to the scan electrode 12 and the sustain electrode 13, and the discharge is repeated for a predetermined period.
- a gradually decreasing pulse is applied to the scan electrode 12, thereby erasing the wall charges.
- the length of the initialization period and the address period is constant irrespective of the luminance weight, but the length of the discharge maintaining period is longer as the luminance weight is larger. In other words, the length of the display period of each subframe is different from each other.
- each discharge performed in the subframe generates vacuum ultraviolet light, which consists of a resonance line having a sharp peak at 147 nm and a molecular beam centered at 173 nm, which is caused by Xe.
- This vacuum ultraviolet ray is applied to each of the phosphor layers 21 to 23 to generate visible light.
- a multi-color / multi-gradation display is performed by subframe unit combination for each RGB color.
- the discharge characteristics of the PDP greatly depend on the discharge characteristics of the protective layer 15 that comes into contact with the discharge gas in the discharge space 24.
- the characteristics required for the protective layer are divided into the characteristics of reducing the firing voltage Vf (secondary electron emission characteristics) and the characteristics of suppressing the variation in discharge. The more excellent both these characteristics, the better the image display performance of the PDP. Is achieved.
- the surface of the protective layer 15 exposed to the discharge space 24 has Have different electron emission characteristics
- the structure is such that the magnesium oxide crystal 15A and the magnesium oxide crystal fine particles 15B are dispersed and present.
- the magnesium oxide crystal 15A is formed by firing a magnesium oxide precursor of an organic material.
- the magnesium oxide crystal fine particles 15B have been crystallized before firing the precursor, and have a higher purity crystal structure than the magnesium oxide crystal 15A.
- the magnesium oxide crystal fine particles 15B as the second crystal are dispersed and exist in the magnesium oxide crystal 15A as the first crystal. Is configured.
- the characteristic of reducing the firing voltage Vf of the protective layer 15 is exhibited by both the magnesium oxide crystal 15A and the magnesium oxide crystal fine particles 15B.
- the discharge gas is excited by the electric field generated inside the discharge space 24, and when Ne + in the discharge gas approaches the surface of the protective layer, a so-called "orange X process" is generated, and the protective layer Electrons in the valence band of transition to the outermost shell of Ne. Then, in accordance with the transition of the electrons, another electron in the protective layer receives the energy change of the electron that has transitioned to Ne +, and is potential-released to the discharge space 24. As a result, the secondary electron emission characteristics are favorably exhibited, and the firing voltage Vf is reduced.
- the potential emission of electrons by this protective layer is such that the outermost electron level of Ne + is considerably deeper than the upper end of the valence band of the protective layer, so even if the electron emission characteristics of magnesium oxide crystal 15A are somewhat poor ( In other words, even if some impurities are mixed in the crystal), sufficient secondary electron emission characteristics (a) can be obtained as the performance required for the protective layer.
- the magnesium oxide crystal 15A of the first embodiment has a sufficient effect even if the magnesium oxide precursor used for forming the protective layer in the coating step by the thick film formation method is used. can get. According to this thick film forming method, impurities such as carbon components in the magnesium oxide precursor may slightly remain in the protective layer. Even in such a case, the protective layer having good performance is formed in the first embodiment.
- the transition of electrons from the valence band of the protective layer also occurs between discharge gas components other than Ne +, but Ne + has the highest effect. This is because the outermost electron level of Ne + with respect to the upper end of the valence band of the protective layer is sufficiently low.
- the characteristics of the protective layer 15 relating to suppression of discharge variation are exhibited by the magnesium oxide crystal fine particles 15B which have a high-purity crystal structure and have excellent electron emission characteristics.
- the protective layer 15 for achieving this has a high degree of crystallinity, such as having few impurities and excellent orientation. Desired. Therefore, in the first embodiment, in order to obtain a good effect of suppressing discharge variation, magnesium oxide crystal fine particles 15B having excellent electron emission characteristics (that is, the high crystallinity) are used. The function to prevent the generation of black noise is shared. In order to obtain many oxygen vacancies in the magnesium crystal fine particles 15B, an oxygen-rich structure was used.
- insulators (crystals) 15A and 15B having different electron emission characteristics are exposed on the surface portion of the protective layer 15 facing the discharge space 24, and the individual crystals 15A Since the function of the discharge characteristics is shared by the 15B and 15B, the advantage is obtained that the degree of freedom in controlling the discharge characteristics is increased and the degree of freedom in the cell design and manufacturing method is also increased.
- the discharge starting voltage Vf is reduced without using an expensive high-voltage transistor in the drive circuit, and the occurrence of discharge variation is suppressed to prevent the occurrence of black noise. This makes it possible to obtain good image performance.
- the insulator (crystal) exposed on the surface of the protective layer 15 facing the discharge space 24 is not limited to magnesium oxide, but may be other insulators (eg, MgA10, BaO, CaO, ZnO, SrO, etc.). ) May be used.
- the method of forming the protective layer 15 of the first embodiment is not limited to a method of adding magnesium oxide crystal fine particles to a magnesium oxide precursor and applying and firing the same. Alternatively, a method such as patterning and etching back after patterning may be used.
- the protective layer 15 of the first embodiment can provide excellent effects even when the protective layer 15 is used as it is, the effects can be further enhanced by performing the following measures.
- cm 3 or more doping concentration in addition to the oxygen deficiency portions inherently present or found during PDP driving, a wavelength of about 700nm visible A luminescent center that generates light emission is formed, and the number of electrons excited near the conduction band increases with abundant visible light emission, so that the effect of suppressing discharge variation can be further enhanced (CC Chao, J. Phys. Chem. Solids, 32 2517 (1971) and M.
- the magnesium oxide crystal fine particles 15B when Si, H, etc. are added to the magnesium oxide crystal fine particles 15B at least in a concentration of about ⁇ -16 / cm 3 or more, these act as a reservoir for electrons excited near the conduction band, and the emission center Since the emission of visible light is prolonged, the effect of suppressing discharge variation and reducing the occurrence of black noise is increased in this case as well.
- the method of adding Si to the magnesium oxide crystal fine particles 15B is as follows. After obtaining the basic structure of the above 15A and 15B by sintering, treatment is performed in an atmosphere in which a gas containing silane and silane is in a plasma state. Alternatively, Si atoms or molecules containing Si may be implanted by doping. Magnesium oxide crystal particles to which Si has been added in advance may be used. As a method of adding H to the protective layer, the surface of the protective layer may be annealed in an H 2 atmosphere or may contain H 2 . The treatment may be performed by placing the protective layer in an atmosphere in which the gas is in a plasma state. Magnesium oxide crystal fine particles to which H has been added in advance may be used.
- the manufacturing method can be applied as a method of manufacturing the PDP 1 of the other embodiments.
- the display electrodes are fabricated on a front panel glass made of soda-lime glass with a thickness of about 2.6 mm.
- a front panel glass made of soda-lime glass with a thickness of about 2.6 mm.
- the display electrode can be formed by a die coating method, a blade coating method, or the like.
- an ITO (transparent electrode) material is applied to the front panel glass in a predetermined pattern. This is dried.
- the metal (Ag) powder and the organic vehicle were exposed. This is applied over the transparent electrode material and covered with a mask having a pattern of a display electrode to be formed. Then, exposure is performed from above the mask, and development and firing (a firing temperature of about 590 to 600 ° C.) is performed. Thereby, a bath line is formed on the transparent electrode.
- this photomask method it is possible to reduce the thickness of a bus line to a line width of about 30 m or less, compared to the screen printing method in which a line width of 100 m was conventionally limited. It is.
- the metal material of this bus line Pt, Au, Ag, Al, Ni, Cr, tin oxide, indium oxide, or the like can be used.
- the electrode may be formed by forming an electrode material by a vacuum evaporation method, a sputtering method, or the like, and then performing an etching process.
- a lead oxide-based or bismuth oxide-based dielectric glass powder having a softening point of 550 ° C to 600 ° C and an organic binder such as butyl carbitol acetate are mixed from above the formed display electrode. Apply applied paste. Then, it is fired at about 550 ° C to 650 ° C to form a dielectric layer.
- a protective layer which is a feature of the present invention, is formed on the surface of the dielectric layer using a printing method (thick film forming method).
- a printing method thin film forming method
- magnesium oxide crystal fine particles manufactured by Ube Industries, Ltd.
- a liquid organic material as the second crystalline material
- a magnesium oxide precursor one or more selected from magnesium jet oxide, magnesium naphthenate, magnesium octoate, and magnesium dimethoxide.
- the protective layer according to the first embodiment is formed by firing at about 600 ° C. to sufficiently remove impurities such as carbon components contained in the material.
- the magnesium oxide precursor other than the above may be used.
- magnesium oxide crystal fine particles made of one kind of material were used, but for the purpose of securing the particle density in the protective layer, etc.
- a plurality of types of magnesium oxide crystal fine particles may be used.
- the size of the magnesium oxide crystal particles may be determined as appropriate according to the thickness of the protective layer. However, in the current design of the protective layer (thickness of 700 nm to about 1 m), it is several tens nm to several hundreds. It is preferable to use fine particles having a size of nm.
- the protective layer of the present invention is excellent in that good performance can be obtained even when manufactured by a thick film forming method, but is formed by a thin film forming method if the manufacturing cost and throughput are within an allowable range. You may. In this case, there is a method in which two different materials are used as evaporation sources and a normal vacuum process is performed.
- the front panel is manufactured.
- a conductive material containing Ag as a main component is applied in a strip shape at regular intervals on the surface of a soda-lime glass panel glass of about 2.6 mm thick by screen printing.
- An address electrode of about 5 m is formed.
- the interval between two adjacent address electrodes is set to about 0.4 mm or less.
- a lead-based glass paste is applied to a thickness of about 20 to 30 ⁇ m over the entire surface of the back panel glass on which the address electrodes are formed, and baked to form a dielectric film.
- a barrier having a height of about 60 to: L00 m is formed on the dielectric film between adjacent address electrodes.
- This partition can be formed, for example, by repeatedly screen-printing a paste containing the above-mentioned glass material and then firing.
- the lead-based glass material constituting the partition walls contain a Si component, since the effect of suppressing the increase in the impedance of the protective layer increases.
- This Si component may be contained in the chemical composition of the glass or may be added to the glass material.
- red (R) phosphor, green (G) phosphor, and blue (b) phosphor are applied to the wall surfaces of the partition walls and the surface of the dielectric film exposed between the partition walls.
- a fluorescent ink containing a gap is applied, and this is dried and fired to form a phosphor layer.
- each RGB color fluorescence is as follows, for example.
- Each phosphor material having an average particle size of 2.0 m can be used. With which put in a proportion of 50 mass 0/0 in the server, Echiruserurozu 1.0 mass 0/0, the solvent (alpha - motor one Bineoru) 49 mass 0 /. And mix with a sand mill to produce a phosphor ink of 15 x 10 3 Pa ⁇ s. Then, this is sprayed from a nozzle having a diameter of 60 ⁇ m to between the partition walls 20 by a pump to be applied. At this time, the panel is moved in the longitudinal direction of the partition wall 20, and the phosphor ink is applied in a strip shape. Thereafter, baking is performed at 500 ° C. for 10 minutes to form phosphor layers 21 to 23.
- front panel glass and the back panel glass are made of soda lime glass, this is an example of a material, and other materials may be used.
- magnesium oxide crystal 15A is used as protective layer 15.
- the protective layer 15 of the second embodiment shown in FIG. 2 is formed of a magnesium oxide crystal 15A so that a carbon nanotube (CNT) 15C, which is a carbon crystal, is exposed to the discharge space 24 instead of the magnesium oxide crystal fine particles 15B.
- the structure is distributed inside.
- the magnesium oxide crystal 15A and the CNT 15C share the functions of reducing the discharge starting voltage Vf required for the protective layer 15 and suppressing the discharge variation, respectively.
- the protective layer 15 can be formed, for example, by adding CNT to an organic material containing a magnesium oxide precursor, applying the CNT to a front panel, and firing it.
- magnesium oxide crystal 15A has the same effect as in the first embodiment. Since the CNT 15C has excellent electron emission characteristics, the secondary electron emission coefficient (r) of the protective layer 15 is improved together with the magnesium oxide crystal 15A, and the firing voltage Vf is favorably reduced.
- CNT15C has the function of increasing the amount of electrons emitted from the protective layer 15.
- the carrier concentration of the protective layer 15 is improved at the time of driving the PDP, and as a result, impedance control is performed, and variations in discharge are suppressed.
- a configuration using magnesium oxide and CNT may be used as described above. -Although the configuration using CNT as the carbon crystal is shown here, the same effect can be obtained by using a carbon crystal having excellent electron emission characteristics such as fullerene in the present invention. .
- the configuration example of the PDP has been described.
- the present invention is not limited to this.
- the PDP is arranged so as to face the discharge space in which the discharge gas is sealed.
- the present invention may be applied to a discharge light emitting element having a configuration in which a plasma layer is generated in the discharge space and emits light.
- the discharge light emitting element for example, the single cell structure of PDP1 in the first embodiment can be used.
- Embodiment 3 5- 1. Composition of protective layer
- FIG. 1A is a cross-sectional view in the X direction
- FIG. 1B is a cross-sectional view in the y direction cut along a_a ′ in FIG. 1A.
- the basic configuration of the PDP 1 is the same as in the first and second embodiments, and only the configuration of the protective layer 15 as a characteristic part is different.
- an island-shaped metal portion 150 made of an island-shaped metal material having a higher energy than the magnesium oxide is disposed so as to face the discharge space 24. More specifically, the island-shaped metal portion 150 is disposed at a position (here, immediately below the scan electrode 12) overlapping the pair of display electrodes 12 and 13 in the panel thickness direction (z direction).
- the island-shaped metal material has a work function of 5 eV or less and has excellent spatter resistance.
- a material selected from among Fe, Al, Mg, Ta, Mo, W, and Ni is preferable. New In the above example, A1 is used.
- various insulating materials, semiconductor materials, and the like may be selected as a material having a higher film energy than the magnesium oxide, and these may be formed in an island shape.
- FIG. 7 shows photoelectron spectroscopy data obtained by forming the island-shaped metal portion on the MgO film and measuring the same.
- the data for the protective layer according to the third embodiment corresponds to 2A
- the data for the comparative example corresponds to 2B.
- the island-shaped metal part is about 1/10 of the cell opening area.
- the island-shaped metal portion of the present invention is desirably set so that the spatial period is about one-tenth or less of the cell size.
- the electron emission does not occur even though the island-shaped metal part is a small area. It is rising at 4.2 eV, which is the work function of Al.
- the rise of electron emission in the data of the comparative example is about 5.0 eV, which corresponds to the energy from the vacuum level to the Fermi level (energy) of the MgO film. From this, in the third embodiment, the effect of suppressing the discharge start voltage Vf by the MgO film itself, improving the electron emission characteristics of the protective layer by the island-shaped metal portion, and suppressing the discharge variation can be expected.
- Figure 8 shows the energy bands of A1 and MgO. From the energy relationship shown in this figure, in the protective layer 15 of the third embodiment, by providing the island-shaped metal portion 150 on the surface of the magnesium oxide, the wall charge can be sufficiently held, and the secondary electron emission amount can be reduced. It can be seen that many characteristics can be obtained. This can be said to be a preferable characteristic for the protective layer of the PDP.
- the island-shaped metal parts 150 it is necessary to provide the island-shaped metal parts 150 so that each of the island-shaped metal parts 150 is isolated from each other and is in an insulated state. There is no problem as long as it is in the shape and location.
- the position where the island-shaped metal part 150 is arranged avoids a protective layer surface area where spattering is remarkable due to discharge generated during PDP driving, and shields visible light emission for image display. It is desirable to have a position that does not cause any problems. For this reason, in the third embodiment, as shown in FIG. 6, a position directly below the display electrode, for example, directly below the bus line 12114 on the scan electrode 12 is suitable.
- the firing voltage Vf can be reduced by about 20% as compared with the conventional one, and the wall charge holding power is comparable to the conventional one. Also, it has been found that a good PDP can be realized which is less likely to occur even in the case of black noise.
- FIGS. 9 (a) and 9 (b) show different configurations of the protective layer.
- the basic configuration of the PDP 1 is the same as in the first to third embodiments, and only the configuration of the protective layer 15 for the characteristic part is different.
- the third embodiment in the protective layer 15, at or near the crystal grain boundary 153 of the adjacent magnesium oxide crystal grains 152 as the first material, the third embodiment.
- the second material described is a structure in which an insulator or a semiconductor or a metal having a higher X-ray energy than the Fermi energy of MgO is deposited to form a composite over the entire protective layer. It has become.
- Such a protective layer 15 can be formed by selectively melting a metal material such as Mg having a melting point of about 650 ° C. or less in MgO.
- the metal precipitated at the crystal grain boundary 153 is not limited to Mg, but preferably has a work function of 5 eV or less and has excellent sputter resistance.
- the metal material may be, for example, at least one selected from the group consisting of Fe, Al, Ta, Mo, W, and Ni.
- the protective layer 15 is made of a nanocomposite composite material in which crystal grains 154 of another material such as (Fe) are dispersed.
- the nanocomposite composite material include a MgO / Fe nanocomposite composite material produced by a technique disclosed in Journal of the Ceramic Society of Japan 108 (9) (2000) p.781-784. May be used.
- the metal used for the crystal grains 154 is not limited to Fe, but is preferably a metal having a work function of 5 eV or less and having excellent sputter resistance.
- Mg metal having a work function of 5 eV or less and having excellent sputter resistance.
- Al, Ta, Mo, W, Ni and the like can be used.
- FIGS. 10 (a) and 10 (b) show a specific configuration in which the composite or the composite material shown in FIGS. 9 (a) and 9 (b) is applied to the protective layer 15 of the PDP.
- FIG. 10 (a) is a cross-sectional view in the X direction
- FIG. 10 (b) is a cross-sectional view in the y direction cut along aa ′ in FIG. 10 (a).
- the protective layer region made of the composite or the composite material is provided locally in each subpixel SU (discharge cell).
- the protective layer region made of the composite or the composite material is As in the case of the island-shaped metal part 150 of the third embodiment, it is possible to avoid a region where spattering is remarkable due to a discharge generated when driving the PDP, and to shield visible light emission for image display. It is desirable to install it in a location where it does not exist. For this reason, in the configuration examples shown in FIGS. 10A and 10B, they are provided locally just below the display electrodes, for example, directly below the bus lines 121 on the scan electrodes 12 in an island shape.
- Embodiment 4 is not limited to the configuration in which the protective layer region made of the composite or the composite material is locally provided, and the entire protective layer 15 is formed of the composite or the composite material. Is also good. '
- the discharge starting voltage Vf can be reduced by about 20% as compared with the related art, and the wall charge holding power is not inferior to the related art, and the black noise is also compared with the related art It has been clarified that a good PDP that is difficult to produce can be realized.
- the present invention is applicable to televisions, particularly high-vision televisions capable of producing high-resolution reproduced images.
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Description
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Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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DE60329013T DE60329013D1 (de) | 2002-11-22 | 2003-11-12 | Plasmaanzeigetafel und verfahren zu ihrer herstellung |
AT03772687T ATE441200T1 (de) | 2002-11-22 | 2003-11-12 | Plasmaanzeigetafel und verfahren zu ihrer herstellung |
US10/533,605 US7432656B2 (en) | 2002-11-22 | 2003-11-12 | Plasma display panel and method for manufacturing same |
EP03772687A EP1564777B1 (en) | 2002-11-22 | 2003-11-12 | Plasma display panel and method for manufacturing same |
JP2005510279A JP5081386B2 (ja) | 2002-11-22 | 2003-11-12 | プラズマディスプレイパネルとその製造方法 |
US12/015,310 US7816869B2 (en) | 2002-11-22 | 2008-01-16 | Plasma display panel and manufacturing method for the same |
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JP2002340027 | 2002-11-22 | ||
JP2002-340027 | 2002-11-22 | ||
JP2003-145709 | 2003-05-23 | ||
JP2003145709 | 2003-05-23 |
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US10533605 A-371-Of-International | 2003-11-12 | ||
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US (2) | US7432656B2 (ja) |
EP (3) | EP1564777B1 (ja) |
JP (3) | JP5081386B2 (ja) |
KR (1) | KR101067578B1 (ja) |
AT (1) | ATE441200T1 (ja) |
DE (1) | DE60329013D1 (ja) |
TW (1) | TW200414259A (ja) |
WO (1) | WO2004049375A1 (ja) |
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Also Published As
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US7432656B2 (en) | 2008-10-07 |
EP2105942A3 (en) | 2009-11-18 |
EP2105942A2 (en) | 2009-09-30 |
EP1564777A1 (en) | 2005-08-17 |
JP2010182696A (ja) | 2010-08-19 |
US20060012721A1 (en) | 2006-01-19 |
JP5081386B2 (ja) | 2012-11-28 |
US7816869B2 (en) | 2010-10-19 |
TW200414259A (en) | 2004-08-01 |
KR101067578B1 (ko) | 2011-09-27 |
US20100039033A1 (en) | 2010-02-18 |
ATE441200T1 (de) | 2009-09-15 |
JP2011129530A (ja) | 2011-06-30 |
EP1564777A4 (en) | 2007-08-22 |
DE60329013D1 (de) | 2009-10-08 |
EP2333806A1 (en) | 2011-06-15 |
EP1564777B1 (en) | 2009-08-26 |
JPWO2004049375A1 (ja) | 2006-03-30 |
KR20050070142A (ko) | 2005-07-05 |
TWI327738B (ja) | 2010-07-21 |
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