JP2001176398A - Plasma display and its member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stable PDP with no abnormal discharge, wherein other characteristics are not sacrificed. SOLUTION: The plasma display member is comprised of an electrode and a dielectric layer covering the electrode and including needle-shaped electric conductors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display member and a plasma display (hereinafter referred to as "PDP"), and more particularly to a PDP, a PDP back plate, which prevents an abnormal discharge of an AC type PDP and improves the reliability of a panel. It relates to a manufacturing method.

[0002]

2. Description of the Related Art PDPs have attracted attention as displays that can be used for thin and large-size televisions. In particular, the AC type PDP has a merit that the structure can be simple and the manufacturing cost can be reduced, and the luminance and display quality can be increased. The AC PDP is a display that displays by discharging between different scan electrodes using wall charges formed on a dielectric surface. The address electrode also participates in the discharge to determine the discharge position of the scan electrode.

[0003] However, part of the wall charges formed for scanning and addressing remains as residual wall charges on the dielectric surface even after display, and due to the wall charges, an abnormal discharge (also referred to as an accidental discharge) is locally concentrated and discharged. Say). In order to prevent this abnormal discharge, Japanese Unexamined Patent Application Publication No. 10-64434 discloses that
There has been proposed a method in which chromium particles and nickel particles are mixed in a dielectric layer to leak residual wall charges accumulated on the dielectric surface to an address electrode.

[0004]

However, the addition of chromium particles or nickel particles to leak the residual charges accumulated on the dielectric surface to the address electrodes has been accompanied by various restrictions. For example, when large conductive particles having an average particle size of 5 μm or more equivalent to the thickness of the dielectric layer are used, conductivity is selectively imparted in the thickness direction with a small amount of addition, that is, anisotropically. Although conductivity can be imparted, there has been a problem that the surface shape of the dielectric becomes non-uniform, and defects occur in post-processes such as partition wall formation and phosphor formation, thereby lowering the yield. On the other hand, when conductive particles having an average particle diameter of 2 to 3 μm smaller than the thickness of the dielectric layer are used, it is necessary to add 10% by weight or more to exhibit anisotropic conductivity. Since the conductive particles are black, the reflectivity of the dielectric decreases, the brightness of the panel decreases, the sinterability of the dielectric layer decreases, and short-circuits between the electrodes occur. there were. For this reason, it is difficult to completely prevent abnormal discharge without causing a problem such as a decrease in the yield of the PDP, a decrease in luminance, a decrease in sinterability, and a continuity between electrodes by the conventional method for preventing abnormal discharge. .

Accordingly, an object of the present invention is to provide a PDP which prevents abnormal discharge and has high reliability with high yield and excellent display characteristics.

[0006]

That is, the present invention provides a plasma display member comprising: an electrode; and a dielectric layer covering the electrode and containing a needle-shaped conductor.
And a plasma display using the same.

The present invention also relates to a member for a plasma display having an electrode and a dielectric layer covering the electrode, wherein the half-time of the potential charged on the member is 10 seconds or less. This is a display member.

The present invention also provides a plasma display using any one of the above-described members for a plasma display.

The inclusion of a needle-shaped conductor in these dielectric layers imparts a slight conductivity, and can leak localized and accumulated charges generated by plasma discharge, leading to accidental discharge. No charge is stored. Furthermore, since this conductive substance is acicular, a desired effect can be exhibited with a small content. Furthermore, since the conductor is acicular, the color tone, surface shape and sinterability of the dielectric layer are almost the same as those of the non-containing type, there is no decrease in the reflectivity of the dielectric layer, and the barrier layer and the phosphor are not formed. The yield does not decrease.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (PDP member and PD according to the present invention)
Production procedure of P) PDP member of the present invention and PD
The procedure for manufacturing P will be described.

As the glass substrate used for the PDP member of the present invention, besides soda glass, heat-resistant glass for PDP such as "PD200" manufactured by Asahi Glass Co., Ltd. or "PP8" manufactured by Nippon Electric Glass Co., Ltd. may be used. it can.

An address electrode is formed on a glass substrate by using a metal such as silver, aluminum, chromium or nickel. As a method of forming, a method of pattern-printing a metal paste containing these metal powders and an organic binder as main components by screen printing, or applying a photosensitive metal paste using a photosensitive organic component as an organic binder, and applying a photo Pattern exposure is performed using a mask, unnecessary portions are dissolved and removed in a developing step, and further heated to 400 to 600 ° C.
A photosensitive paste method in which a metal pattern is formed by baking may be used. In addition, an etching method in which a metal such as chromium or aluminum is sputtered on a glass substrate, a resist is applied, and the resist is subjected to pattern exposure / development, followed by etching to remove an unnecessary portion of the metal by etching. The electrode thickness is preferably from 1 to 10 μm, more preferably from 2 to 5 μm. If the electrode is too thin, the resistance value tends to be large and accurate driving tends to be impossible. If the electrode is too thick, a large amount of material is required and the cost tends to be disadvantageous. Address electrode width is 20-200μ
m is preferred, and more preferably 30 to 100 μm. If the address electrodes are too thin, the resistance value tends to be high and accurate driving tends to be difficult. If the address electrodes are too thick, the distance between adjacent electrodes is small, and short-circuit defects tend to occur. Further, the address electrodes are formed at a pitch corresponding to the display cell (the area where each RGB of a pixel is formed). It is preferable that the pitch is formed at a pitch of 100 to 500 μm for a normal PDP and 100 to 250 μm for a high definition PDP.

Next, a dielectric layer is formed. The dielectric layer is formed by applying a glass paste obtained by kneading a pigment, a glass powder, an organic binder, etc. onto the substrate on which the electrodes are formed,
It can be formed by firing at 00 to 600 ° C. The thickness of the dielectric layer is preferably 4 to 20 μm.

In the PDP member of the present invention, it is important that the dielectric layer contains a needle-shaped conductor. By adopting the needle-shaped conductor, it is possible to obtain conduction in the thickness direction of the dielectric layer as shown in FIG. 1 with a small amount of addition, that is, it is possible to leak the electric charge that is excessively accumulated on the surface. As described later, abnormal discharge in the PDP can be prevented. Also, since the content of the conductor necessary for preventing abnormal discharge can be reduced to about 50% to 1% of the conventional one, the brightness of the panel is reduced, the sinterability of the dielectric layer is reduced, and the distance between the electrodes is reduced. Short circuit can be prevented.

It is preferable to use a needle-like conductor having an aspect ratio of minor axis length to major axis length of 2 to 100. A desired effect can be obtained by using the needle-shaped conductor in this range. Further, the shape of the needle-shaped conductor is not limited to a shape that is straight in the major axis direction, but may be slightly bent. If the total bending angle is 90 degrees or less, it can be used effectively.
Here, the major axis length refers to the length in the longitudinal direction of the acicular substance,
The minor axis length refers to a length corresponding to the diameter of a cross section when the needle-shaped conductor is broken halfway.

The shape of the needle-shaped conductor is such that the major axis length is 1
It is preferable to use one having a diameter of 10 to 10 μm. When the major axis length is longer than 1 μm, the advantage of the needle shape becomes effective. When the major axis length is 10 μm or less, the needle-shaped conductor does not exceed the thickness of the dielectric layer, and projections on the surface of the dielectric layer are less likely to occur. This is preferable because no defect occurs in the subsequent step. The projection of the needle-shaped conductor on the surface of the dielectric layer can be observed with an optical microscope or an SEM. Further, the major axis length of the needle-shaped conductor is more preferably 2 to 6 μm, and by using a material in this range, the number of protrusions on the surface of the dielectric layer is small, and the content in the dielectric layer is small. Done,
In addition, there is no possibility of conduction between adjacent electrodes, and charges can be effectively leaked.

The minor axis length of the needle-shaped conductor is 0.1 to 0.5 μm.
m is preferably used. Short axis length is 0.1μ
By being larger than m, the strength is guaranteed as a needle-like substance, and it is easily crushed or cut at the time of paste kneading,
It is preferable because it does not deform into a lump. In addition, by setting the minor axis length to be smaller than 0.5 μm, the shape of the needle does not become too thick, and a distinct difference from the granular particles appears, such as the conventional conductive particles described above. This is preferable because no problem occurs. More preferably, the minor axis length of the needle-shaped conductor is 0.12 to 0.3 μm.
By using a material in this range, the strength as a needle-like substance is ensured, and the content in the dielectric layer can be small, so that electric charges can be effectively leaked.

The content of the needle-shaped conductor in the dielectric layer is 0.1
It is preferably about 5% by weight. By making it more than 0.1% by weight, the volume resistivity of the dielectric material is surely lowered,
This is preferable because excess charges can be leaked. Further, it is preferable that the content be less than 5% by weight because a desired function can be effectively performed without worrying about the possibility of conduction between the electrodes. A more preferred content is 1 to 3% by weight. By being in this range, a plasma display member free from abnormal discharge can be formed most efficiently and stably.

In the present invention, it is preferable to use a metal or a metal oxide as the conductive material. In the case of a metal, it is preferable to use Ni or Cr which is hardly oxidized, or an alloy thereof. In the case of a metal oxide, a metal oxide such as indium oxide, tin oxide, or titanium oxide is preferably used, or a mixture thereof. Further, semiconductors obtained by doping these metal oxides with impurities may be used. In particular, tin oxide doped with antimony is preferably used.

In the present invention, the conductive material itself may be in the form of a needle, or may be a core having a core-like body coated with a conductive material. The needle-shaped body serving as a nucleus does not necessarily need to be a conductive material, and may be alumina, titanium oxide, ceramics, or the like. Acicular titanium oxide is more preferably used in terms of shear strength.

The dielectric layer of the present invention is preferably composed of low-melting glass as a matrix. Further, a filler may be contained.

The glass components include lead oxide, bismuth oxide,
Containing at least one or more of zinc oxide and phosphorus oxide,
It is preferable to use a glass powder containing 10 to 80% by weight of these in total. By setting it to 10% by weight or more, 600 ° C
Sintering at a temperature below is facilitated, and when the content is 80% by weight or less, the stability of the glass can be ensured.

The glass component is mainly composed of glass having a coefficient of thermal expansion α ₅₀ to ₄₀₀ in the range of ₅₀ to ₄₀₀ ° C. of 70 to 85 × 10 ⁻⁷ / K. It is preferable because the stress applied to the glass substrate during firing is reduced. If the coefficient of thermal expansion is too large, stress tends to be applied to the substrate on the side where the dielectric layer is formed, and if it is too small, stress tends to be applied to the side without the dielectric layer. It is in. Therefore, the substrate may be cracked when the substrate is repeatedly heated and cooled. In addition, when sealing with the front glass substrate, both substrates may not be parallel and cannot be sealed due to warpage of the substrates.

It is preferable that the glass component is a component that is inactive with respect to the electrode components. That is, it is preferable that the glass component does not substantially contain an alkali metal or an alkaline earth metal. The term "substantially free" means that 0.5% by weight or less, preferably 0.
1% by weight or less.

Since the dielectric layer is formed in contact with the electrode,
For example, when an alkali metal is present in the glass component, when silver is used for the electrode, the ion exchange reaction and the reduction reaction of silver proceed, and the silver colloid diffuses into the dielectric layer and tends to be partially colored. . Also, if alkaline earth metal is present in the glass component, an ion exchange reaction occurs with the glass component in the glass substrate or electrode during firing, even if the coefficient of thermal expansion matches the substrate glass as described above. In addition, the thermal expansion coefficient of the surface portion of the substrate glass and the dielectric layer glass component changes, the thermal expansion coefficient does not match with the substrate glass, tensile stress is generated in the substrate glass, and the substrate tends to crack.

In order to suppress the thermal deformation of the glass substrate on which the electrodes are formed, it is preferable that the firing step of the dielectric layer is performed at 400 to 600 ° C. For this reason, the inorganic component in the dielectric paste has a glass transition point of 350 to 550 ° C. and a softening point of 40 ° C.
It is preferable to use glass at 0 to 600 ° C. as a main component.
If the glass transition point or the softening point is too low, the glass will melt during the subsequent steps, and the uniformity of the thickness and the properties of the dielectric layer will tend to decrease. On the other hand, if the glass transition point or the softening point is too high, the firing on the glass substrate becomes insufficient, and the dielectric layer tends to be easily peeled off or missing.

As glass having such thermal characteristics,
Those containing 10 to 80% by weight of bismuth oxide are preferred because the glass transition point, softening point and thermal expansion coefficient are easily controlled. Also, bismuth oxide 10-8
The use of 0% by weight of glass has advantages such as improving the stability of the dielectric paste. For example, those containing the following composition in oxide conversion notation are preferable. Bismuth oxide 10-80 wt% Silicon oxide 3-50 wt% Boron oxide 10-40 wt% Zinc oxide 5-30 wt%.

Further, even when glass containing 10 to 80% by weight of lead oxide is used, a dielectric layer having excellent stability can be formed as in the case of using bismuth oxide. For example, the following composition is preferable. Lead oxide 10-80 wt% Silicon oxide 3-50 wt% Boron oxide 10-40 wt% Zinc oxide 5-30 wt%.

As one type of filler, a pigment may be added. In particular, the addition of a white pigment is preferable from the viewpoint of improving white luminance, and it is preferable to add 5 to 50% by weight in the dielectric layer. By doing so, the total light reflectance on the surface of the dielectric layer becomes 50 to 90%, light leakage in the direction of the glass substrate or in the direction of the adjacent cells is suppressed, and high-luminance and high-quality display becomes possible. If the filler content is too small, the dielectric layer becomes translucent, light leakage increases, and the display quality tends to deteriorate. On the other hand, if the filler content is too large, the sinterability of the dielectric layer is reduced, and voids are likely to be formed, and the reliability tends to be reduced. As fillers used for white pigments,
Titanium oxide, aluminum oxide, zirconium oxide, zinc oxide, ceramic particles having a softening point of 600 ° or more containing alumina and silica as a main component and having a plurality of oxides are preferable, and titanium oxide having a particle diameter of 0.05 to 3 μm is used. It is particularly preferred to use.

As a method of adding the pigment to the dielectric layer, a method of adding a pigment powder to a dielectric paste, a method of dissolving a pigment component in a glass component, and the like can be used.

As the organic binder, cellulose compounds such as ethyl cellulose and methyl cellulose, and acrylic compounds such as methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, methyl acrylate, ethyl acrylate and isobutyl acrylate can be used. Further, additives such as a solvent and a plasticizer may be added to the glass paste. As the solvent, terpineol, butyrolactone, toluene,
General-purpose solvents such as methylcellosolve and butyl carbitol acetate can be used. Further, dibutyl phthalate, diethyl phthalate, or the like can be used as the plasticizer.

In the present invention, the material constituting the dielectric layer preferably has a volume resistivity of 1 × 10 ^{10 to} 5 × 10 ¹³ Ωcm. By being in this range, the plasma display does not cause abnormal discharge and stable driving can be performed. If the resistivity is higher than 5 × 10 ¹³ Ωcm, abnormal discharge is likely to occur. If the resistivity is lower than 1 × 10 ¹⁰ Ωcm, abnormal discharge does not occur but another problem such as screen burn-in occurs. Not preferred.

The volume resistivity can be determined by providing electrode films on the upper and lower surfaces of a dielectric layer formed to a uniform thickness of about 10 to 100 μm and measuring the resistance between the two electrodes. An ultra-high resistance meter can be used for the measurement.

In the PDP member of the present invention, the half time of the potential charged on the surface is 10 seconds or less. By setting the half-life of the potential within 10 seconds, abnormal discharge of the PDP can be suppressed.

The half-life of the charged potential can be measured by using an honest meter. This device is a device for rotating a sample fixed on a disk, applying a voltage on the one hand, and measuring an accumulated potential on the other hand. Then, the time when the application of the voltage is stopped is set as the start time, and the time required until the potential is reduced by half is evaluated. Usually 10
When a voltage of kV is applied, the sample has a potential of 10 mV to 1 V, and it is possible to measure the time when the potential is reduced by half. The sample to be evaluated can be evaluated in the same manner on a substrate on which only electrodes and dielectrics are formed, or on a substrate on which all of electrodes, dielectrics, partition walls, and phosphors are formed, and almost the same results can be obtained. Can be.

By this evaluation method for measuring the half-life of the potential of the PDP member, it is possible to predict the occurrence of abnormal discharge without producing a PDP.

Next, partition walls for partitioning the discharge cells are formed. The height of the partition wall is preferably 80 μm to 200 μm. By setting the thickness to 80 μm or more, it is possible to prevent the phosphor and the scan electrode from coming too close to each other, and to suppress the deterioration of the phosphor due to discharge. Further, by setting the thickness to 200 μm or less, the distance between the discharge at the scan electrode and the phosphor is prevented from being too large, and the line width (L) of the partition is sufficiently 10 μm ≦ L ≦ 80 μ at half width.
m is preferable. When the thickness is 10 μm or more, breakage at the time of sealing the front plate and the back plate can be prevented. When the thickness is 80 μm or less, the phosphor formation area can be increased, and high luminance can be obtained.

The partition walls are generally formed by patterning a glass paste composed of inorganic fine particles and an organic binder in the shape of the partition walls and then baking the glass paste at 400 to 600 ° C. to form the partition walls.

As the inorganic fine particles, glass, ceramic (alumina, cordierite, etc.) and the like can be used. In particular, silicon oxide, boron oxide, or
Glass and ceramics containing aluminum oxide as an essential component are preferred.

Organic binders include polyvinyl alcohol, polyvinyl butyral, methacrylate polymer, acrylate polymer, acrylate-
Methacrylic acid ester copolymers, α-methylstyrene polymers, butyl methacrylate resins, and cellulose compounds such as ethyl cellulose and methyl cellulose can be used. Further, additives such as a plasticizer, a thickener, an organic solvent, an antioxidant, a dispersant, an organic or inorganic precipitation inhibitor and a leveling agent are also added.

When it is desired to adjust the viscosity of the solution, an organic solvent may be added. As the organic solvent used at this time, methyl cellosolve, ethyl cellosolve,
Butyl cellosolve, methyl ethyl ketone, dioxane,
Acetone, cyclohexanone, cyclopentanone, isobutyl alcohol, isopropyl alcohol, tetrahydrofuran, dimethyl sulfoxide, γ-butyl lactone, bromobenzene, chlorobenzene, dibromobenzene, dichlorobenzene, bromobenzoic acid, chlorobenzoic acid and the like and the like Organic solvent mixtures containing one or more are used.

When the partition walls of the PDP member of the present invention are formed by a photosensitive paste method described later, the glass paste is selected from at least one of a photosensitive monomer, a photosensitive oligomer, and a photosensitive polymer. It is preferable to contain a photosensitive component, and further, if necessary, a photopolymerization initiator, a light absorber, a sensitizer, a sensitization aid, and a polymerization inhibitor.

As a method of patterning a partition using a glass paste, it can be formed by a method such as a screen printing method, a sand blast method, a photosensitive paste method, a photo embedding method, and a mold transfer method.

The screen printing method is a method in which a paste is spread on a screen plate having an emulsion layer formed on a portion other than a pattern to be formed, and is transferred onto a substrate using a squeegee. Since the transferable thickness is about 10 to 30 μm,
After the printing is repeated 5 to 15 times to secure the required height, baking is performed to form partition walls.

In the sand blast method, after a glass paste is applied on a substrate, a dry film resist is laminated thereon, the dry film resist is patterned by a photolithography method, and abrasive sand is blown to remove unnecessary portions. How to After removing the unnecessary portions, the resist portions are removed and further baked, whereby the partition walls can be formed.

In the photo embedding method, a dry film resist is laminated on a substrate, and a pattern for removing the resist in a portion where a partition is to be formed is formed. The pattern uses a photolithography method. Next, after the glass paste is embedded in the portion where the resist has been removed, the entire resist portion is removed. To remove it,
There are a method of dissolving with alkali and a method of burning off by baking. Next, by baking, a partition can be formed.

Among the various partition wall forming methods, the photosensitive paste method is superior in terms of high definition and simple process. Next, an example of a procedure for forming a partition wall using a photosensitive paste will be described below.

A photosensitive paste is applied to a glass substrate. As a coating method, a general method such as a screen printing method, a bar coater, a roll coater, a die coater, and a blade coater can be used. The coating thickness is
It can be adjusted by selecting the number of applications, the screen mesh, and the viscosity of the paste. Alternatively, a method may be used in which a photosensitive sheet is prepared by applying a photosensitive paste on a film such as a polyester film, and the photosensitive paste is transferred onto a substrate using an apparatus such as a laminator.

After applying the photosensitive paste, exposure is performed using an exposure device. The exposure is generally performed by a mask exposure using a photomask, as is performed by ordinary photolithography. As the mask to be used, either a negative type or a positive type is selected depending on the type of the photosensitive organic component. Alternatively, a method of directly drawing with a laser beam or the like without using a photomask may be used. The actinic rays used for the exposure include, for example, visible rays, near ultraviolet rays, ultraviolet rays, electron beams, X-rays, and laser beams. Of these, ultraviolet rays are most preferable, and as the light source, for example, a low-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a halogen lamp,
A germicidal lamp or the like can be used. Among these, an ultra-high pressure mercury lamp is preferred. Exposure conditions vary depending on the coating thickness, but exposure is performed for 0.1 to 10 minutes using an ultra-high pressure mercury lamp having an output of 1 to 100 mW / cm ² .

After the exposure, development is carried out by utilizing the difference in solubility between the exposed portion and the unexposed portion in the developing solution. In this case, an immersion method, a spray method, a brush method, or the like is used.

As the developing solution, a solution in which the organic component to be dissolved in the photosensitive paste can be dissolved is used. When a compound having an acidic group such as a carboxyl group is present in the photosensitive paste, it can be developed with an aqueous alkali solution. Examples of the alkaline aqueous solution include sodium hydroxide and sodium carbonate,
An aqueous solution of sodium carbonate, an aqueous solution of calcium hydroxide, or the like can be used. However, an aqueous solution of an organic alkali is preferred because an alkaline component can be easily removed during firing. As the organic alkali, a general amine compound can be used. Specific examples include tetramethylammonium hydroxide, trimethylbenzylammonium hydroxide, monoethanolamine, diethanolamine and the like. The concentration of the aqueous alkali solution is usually 0.01
10 to 10% by weight, more preferably 0.1 to 5% by weight. If the alkali concentration is too low, the soluble portion tends to be difficult to remove, and if the alkali concentration is too high, the pattern portion tends to peel off and the non-soluble portion tends to corrode. The development temperature during development is preferably from 20 to 50 ° C. from the viewpoint of process control.

Next, firing is performed in a firing furnace. The firing atmosphere and temperature vary depending on the type of paste or substrate, but firing is performed in an atmosphere such as air, nitrogen, or hydrogen. As the firing furnace, a batch type firing furnace or a roller hearth type continuous firing furnace can be used. The firing temperature is 400-8
Perform at 00 ° C. 450 to 6 when the substrate is glass
The firing is carried out at a temperature of 20 ° C. for 10 to 60 minutes.

After the formation of the partition walls, a phosphor layer which emits light of each color of RGB is formed. By applying a phosphor paste containing a phosphor powder, an organic binder and an organic solvent as main components between predetermined partition walls, a phosphor layer can be formed. Examples of the method include a screen printing method in which a pattern is printed using a screen printing plate, a dispenser method in which a phosphor paste is pattern-discharged from the tip of a discharge nozzle, and a photosensitive phosphor using a photosensitive organic component as an organic binder. A photosensitive paste method using a paste or the like can be employed.

The thickness of each color phosphor layer is 10 to 50 μm.
It is preferred that By setting the thickness to 10 μm or more, sufficient luminance can be obtained. Further, by setting the thickness to 50 μm or less, a discharge space is secured, and the phosphor can emit light effectively. In this case, the thickness of the phosphor layer is measured as a thickness formed at an intermediate point between adjacent partition walls, that is, a thickness of the phosphor layer formed at the bottom of the discharge space (in the cell).

As the phosphor powder to be used, red is Y
2O3: Eu, YVO4: Eu, (Y, Gd) BO3:
Eu, Y203S: Eu, γ-Zn3 (PO4) 2: M
n, (ZnCd) S: Ag + In2O3, etc.
Zn2GeO2: Mn, BaAl12O19: Mn, Z
n2SiO4, LaPO4: Tb, ZnS: Cu, A
1, ZnS: Au, Cu, Al, (ZnCd) S: C
u, Al, Zn2SiO4: Mn, As, Y3A15O
12: Ce, CeMgAl11O19: Tb, Gd2O
2S: Tb, Y3A15O12: Tb, ZnO: Zn, etc., and blue is Sr5 (PO4) 3Cl: Eu, B
aMgAl14O23: Eu, BaMgAl16O2
7: Eu, BaMg2Al14O24: Eu, (Ba,
Eu) MgAl10O17, ZnS: Ag + red pigment,
Y2SiO3: Ce and the like.

The substrate on which the phosphor layer has been formed may be used as required.
By firing at 400 to 550 ° C, the PDP of the present invention
Member can be manufactured.

Using the above-described PDP member as a back plate, after sealing with the front plate, a discharge gas composed of helium, neon, xenon, or the like is filled in a space formed between the front and back substrates at intervals. A plasma display of the present invention can be manufactured by mounting a driving circuit. The front plate includes a transparent electrode, a bus electrode, a dielectric, and a protective film (M) in a predetermined pattern on the substrate.
gO) may be formed on the substrate, and a color filter layer may be formed on a portion corresponding to the RGB phosphor layers formed on the rear substrate. Further, a black stripe may be formed to improve the contrast.

(Discharge Operation of PDP of the Present Invention) The discharge operation of the PDP of the present invention manufactured as described above will be described.

FIG. 1 is a sectional view of a plasma display member according to an embodiment of the present invention. Reference numeral 20 denotes a glass substrate, A denotes an electrode, 21 denotes a dielectric layer, and 30 denotes a needle-shaped conductive substance mixed in the dielectric layer.

FIG. 2 is a schematic sectional view of a plasma display panel using the plasma display member of the present invention. In FIG. 2, reference numeral 10 denotes a front glass substrate;
Is a glass substrate on the rear side. Ultraviolet light generated in the space 24 is converted into visible light by the phosphor 23, and light is displayed by emitting light upward in the drawing. On the front plate 10,
An X electrode (13X) and a Y electrode (13Y) composed of a transparent electrode 11 and a highly conductive bus electrode 12 formed thereon (lower in the drawing) are formed, and a dielectric layer 14 and a protective layer composed of MgO are formed. 15 covered. The bus electrodes 12 are provided along the farthest ends of the pair of the X electrode and the Y electrode in order to supplement the conductivity of the transparent electrode 11.

The back plate 20 has address electrodes A1, A
2, A3 are provided and covered with the dielectric layer 21. A stripe-shaped partition wall (rib) 22 is formed adjacent to the address electrodes A1, A2, and A3. The partition wall 22 has two functions for eliminating influence on adjacent cells at the time of address discharge and for preventing light crosstalk.
Red, blue, and green phosphors 23R, 23 for each adjacent rib 22
G and 23B are separately coated so as to cover the address electrodes and the rib separation surfaces.

Further, as shown in FIG.
The back plate 20 is combined with a gap of about 100 μm, and a space 24 between them is filled with a mixed gas for discharge of Ne + Xe.

FIG. 3 is a plan view of a panel showing the relationship between X, Y electrodes and address electrodes of the above-mentioned three-electrode surface discharge type PDP. The X electrodes X1 to X10 are arranged in parallel in the horizontal direction and are commonly connected at an end of the substrate, and the Y electrodes Y1 to X10 are connected in common.
Y10 is provided between the X electrodes, and is individually led out to the end of the substrate. These X and Y electrodes form a display line in pairs, and sustain discharge voltages for display are alternately applied. XD1 and XD2 and YD1 and YD2 are dummy electrodes provided outside the effective display area, respectively, and are provided to alleviate the non-linear characteristics of the peripheral portion of the panel. The address electrodes A1 to A14 provided on the back plate 20 are provided orthogonal to the X and Y electrodes.

The X and Y electrodes are paired and the sustain discharge voltage is applied alternately, but the Y electrodes are also used as scan electrodes when writing information. The address electrode is used when writing information, and a plasma discharge is generated between the address electrode and the Y electrode to be scanned according to the information. Therefore, only the discharge current for one cell needs to flow through the address electrode. Further, since the discharge voltage is determined by the combination with the Y electrode, driving at a relatively low voltage is possible. Such a low current and low voltage drive enables a large screen display.

FIG. 4 is an electrode applied voltage waveform diagram for explaining a specific PDP driving method. The voltage applied to each electrode is, for example, Vw = 130V, Vs =
180V, Va = 50V, -Vsc = -50V, -Vy
= −150 V, and Vaw and Vax are set to the intermediate potentials of the voltages applied to the respective other voltages.

In driving a three-electrode surface discharge type PDP, one subfield includes a reset period, an address period, and a sustain discharge period (display period).

In the reset period, a write pulse is applied to the X electrodes connected in common at times ab, and discharge occurs between the XY electrodes on the entire panel (W in the figure). Of the charges generated in the space 25 by this discharge, positive charges are drawn to the Y electrode side where the voltage is low, and negative charges are drawn to the X electrode side where the voltage is high. As a result, at time b when there is no write pulse, a discharge occurs again due to the high electric field due to the electric charge attracted between the X electrode and the Y electrode and accumulated in the dielectric layer 14 (C in the figure). As a result, the charges on all the X and Y electrodes are neutralized, and the reset of the entire panel ends. The period bc is the time required for neutralizing the charge.

Next, during the address period, -50 is applied to the Y electrode.
V (-Vsc), 50 V (Va) is applied to the X electrode, and Y
While sequentially applying a scan pulse of −150 V (−Vy) to the electrodes, an address pulse of 50 V (Va) according to display information is applied to the address electrodes. As a result, a large voltage of 200 V is applied between the address electrode and the scan electrode, and a plasma discharge occurs. However, since the voltage and the pulse width are not as large as those of the entire write pulse at the time of reset, the opposite discharge due to the accumulated charge does not occur even after the application of the pulse is completed. As for the space charge generated by the discharge, negative charges are accumulated on the X electrode side and the address electrode side where 50 V is applied, and positive charges are accumulated on the dielectric layers 14 and 21 on the Y electrode side where -50 V is applied.

This point can be understood from the explanatory diagram of the abnormal discharge shown in FIG. The accumulated charges thus generated and accumulated on the X electrode and Y electrode form a memory function for sustain discharge in a subsequent sustain discharge period. That is, when a subsequent sustain discharge voltage is applied between the X and Y electrodes, the discharge is performed during the address period and the charge is accumulated between the X and Y electrodes.
The sustain pulse voltage and the accumulated charge voltage are superimposed,
Sustain discharge occurs between the X and Y electrodes.

Further, as the scan pulse (-Vy) moves through the Y electrode, for example, the positive charge of the space charge is changed as shown in FIG.
It seems that the negative charges move to the right side and accumulate at each end. Then, the charge on the address electrode not used for the memory function is accumulated without being discharged even during the subsequent sustain discharge period (FIG. 5).
(C)) Eventually, abnormal discharge occurs accidentally. (FIG. 5
(D)).

Finally, in the sustain discharge period, display discharge is performed in accordance with display luminance by utilizing wall charges stored in the address period. That is, a sustain pulse is applied between the X and Y electrodes to such an extent that a cell having wall charges is discharged but a cell without wall charges is not discharged. as a result,
In the cell in which the wall charges are accumulated during the address period, the discharge is alternately repeated between the X and Y electrodes. The display brightness is expressed according to the number of the discharge pulses. Therefore, by repeating this subfield a plurality of times in the weighted sustain discharge period, multi-stage display is enabled. And RG
By combining the cells of B, full-color display can be realized.

As shown in FIG. 5, on the dielectric 14 formed on the X and Y electrodes, wall charges are used for discharge during the accumulation and sustain discharge period. However, the charge on the dielectric layer 21 formed on the address electrode does not have such a use, and there is essentially no positive reason to accumulate such a large amount of charge. The accumulated charges are accumulated on the dielectric surface. This large amount of accumulated electric charges will eventually become as shown in FIG.
Causes abnormal discharge.

Therefore, by gradually leaking the charges accumulated on the inner surface of the cell, especially on the address electrodes, it is possible to prevent a large amount of charges from accumulating on the inner surface of the cell until an abnormal discharge occurs. As a specific leak means, it is effective to reduce the resistance of the dielectric layer 22 to such an extent that electric charges leak. As a result, the electric charge accumulated on the inner surface of the cell does not accumulate to the extent that abnormal discharge occurs. In this case, the dielectric layer 21 needs to have a resistance high enough to maintain sufficient insulation between the address electrodes.

The electric charges and arrows shown in FIG.
FIG. 3 schematically illustrates a state in which charges accumulated on one surface move to an electrode A via a needle-shaped conductor 30 contained in a dielectric layer. In this way, the dielectric layer 21
The charge on the surface always leaks to the electrode A little by little,
There is no conduction between the electrodes A, and the dielectric layer 21 sufficiently retains its original insulation.

[0075]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific details of the present invention will be described. First, the back plate of the plasma display was manufactured.

A 42-inch diagonal glass substrate (PD200 manufactured by Asahi Glass Co., Ltd.) was washed, and address electrodes were formed on the surface thereof. The electrodes were formed by a photosensitive paste method. After applying and drying a photosensitive silver paste on the entire surface of the substrate, a desired pattern was exposed to ultraviolet light, unnecessary portions were removed with a developing solution, and firing was performed. In this embodiment, a silver electrode having a stripe pattern with a thickness of 3 μm, a line width of 100 μm, and a pitch of 360 μm was formed.

Next, a dielectric layer was formed on this electrode.
The dielectric paste was composed of 65% by weight of an inorganic component, 1% by weight of ethylcellulose, and 34% by weight of terpineol, and was applied and dried by screen printing. This is 58
By firing at 0 ° C., a 7 μm thick dielectric layer was formed.

The following materials were used for the needle-shaped conductor in each example. (1) Needle-like Ni: major axis length 2.5 μm,
Short axis length 0.5 μm (2) Needle-shaped conductive titanium oxide A: long axis length 3 μm, short axis length 0.2 μm (3) Needle-shaped conductive titanium oxide B: long axis length 5 μm, short axis 0.2 μm in length (4) Acicular conductive titanium oxide C: major axis length 9 μm, minor axis length 0.2 μm (5) Acicular electrically conductive alumina: major axis length 3 μm, minor axis length 0 The conductors (2), (3) and (4) were coated with antimony-doped tin oxide, and the conductor (5) was coated with antimony-doped indium oxide. What was done was used.

Next, partition walls were formed thereon. A photosensitive partition paste is applied on the entire surface of the dielectric layer and dried, only the desired pattern is exposed to ultraviolet light, unnecessary portions are removed with a developing solution, and baking is performed to form a partition having a line width of 70 μm and a height of 100 μm. did.

Next, a phosphor layer was formed. The phosphor paste is injected into the space between the partition walls and passes through a binder removal process to have a thickness of 20 μm.
A phosphor layer of μm was formed.

Next, a method of manufacturing a front plate of a plasma display was performed.

First, the glass substrate was washed, and then a transparent conductive film (ITO) was formed all over the substrate and patterned by photolithography. A photosensitive black conductive paste and a photosensitive silver paste are applied thereon in this order,
A bus electrode was formed by patterning by photolithography. Next, a front plate member was formed by forming a dielectric layer by screen printing, drying, and baking.

Next, a low-melting glass sealing layer for sealing was formed on the periphery of the front plate, and a protective film (MgO) 15 was formed by vapor deposition.

Next, the substrates of the front plate and the back plate were assembled and sealed, the inside was evacuated, and a discharge gas (Ne + Xe) was sealed to prepare a panel.

The abnormal discharge was evaluated by connecting the drive circuit and lighting the entire surface. If there is an abnormal discharge, the extra white point is lit for an instant at any point on the panel, and this was observed. Observed for 60 seconds and lit once or more were classified as having abnormal discharge.

For evaluation of sinterability, the cross section of the dielectric layer was examined by SEM.
The presence or absence of a gap was examined by observing the above, and those without a gap were determined to have good sinterability. Gas with poor sintering properties is not preferred because the gas adsorbed during panel lighting is released and the display brightness is reduced.

The defects of the partition walls and the phosphor were observed using a shape inspection device after the formation of the back plate. At this time, the surface shape in the dielectric layer was non-uniform, that is, there was a shape defect at the bottom of the partition wall due to the presence of coarse particles, etc., bubbles were present at the bottom of the partition wall, or the shape of the phosphor was defective. The case was regarded as defective.

In the evaluation of the luminance, the luminance of the embodiment of the present invention was relatively evaluated, with the luminance when the plasma display to which no needle-shaped conductor was added being lit in white was set to 100.
It was a necessary condition that the relative value was 90 or more.

[0089]

[Table 1]

In Examples 1 to 9 using the needle-shaped conductor, the charged electric charge can be leaked quickly, there is no abnormal electric discharge, and since these can be achieved by adding a small amount, structural defects are also reduced. It did not occur and the luminance was satisfactory.

[0091]

According to the present invention, by using a member for a plasma display having a dielectric layer containing a small amount of a needle-shaped conductor, the member is generated by a discharge within an address period and is formed on the surface of the back plate dielectric layer. Charges to be accumulated can be leaked as appropriate, and abnormal discharge due to excessively accumulated charges can be prevented. Furthermore, since the conductor is acicular,
The desired effect can be exhibited with a small content, and therefore, the color tone, surface shape and sinterability of the dielectric layer are almost the same as those of the non-containing type, and the reflectance of the dielectric layer does not decrease, and Accordingly, the object of the present invention can be achieved without lowering the yield at the time of forming the partition walls and the phosphor.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a plasma display member according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view of a PDP according to one embodiment of the present invention.

FIG. 3 is a schematic view of a display electrode pair of a three-electrode surface discharge type PDP.

FIG. 4 is an electrode applied voltage waveform diagram for explaining a PDP driving method.

FIG. 5 is an explanatory diagram of abnormal discharge.

[Explanation of symbols]

 10: Front glass substrate 11: Transparent electrode 12: Bus electrode 14: Dielectric layer 15: Protective layer (MgO) 20: Back glass substrate 21: Dielectric layer 22: Partition wall 23: Phosphor 24: Discharge space 30: Needle-shaped conductor A: Address electrode

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) JA05 JA08 JA20

Claims (11)

[Claims] 1. A member for a plasma display, comprising: an electrode; and a dielectric layer covering the electrode and containing a needle-shaped conductor. 2. The member for a plasma display according to claim 1, wherein the major axis length of the acicular conductor is 1 to 10 μm. 3. The needle-shaped conductor has a minor axis length of 0.1 to 0.5 μm.
The member for a plasma display according to claim 1, wherein m is a major axis length of 1 to 10 m. 4. The content of a needle-like conductor in a dielectric layer is 0.1.
2. The member for a plasma display according to claim 1, wherein the content is about 5% by weight. 5. The member for a plasma display according to claim 1, wherein the conductive material of the needle-shaped conductor is a metal or a metal oxide. 6. The member for a plasma display according to claim 1, wherein the needle-like conductor is formed by coating a surface of the needle-like body with a conductive material such as metal or metal oxide. 7. The semiconductor device according to claim 5, wherein the metal oxide of the conductive material is a semiconductor doped with impurities.
The member for a plasma display according to the above. 8. The metal oxide of the conductive material of the acicular conductor,
The member for a plasma display according to any one of claims 5 to 7, wherein the member is indium oxide, tin oxide, or titanium oxide. 9. The material constituting the dielectric layer has a volume resistivity of 1
× 10^Ten~ 5 × 10 ¹³Ωcm
The member for a plasma display according to claim 1. 10. A member for a plasma display having an electrode and a dielectric layer covering the electrode, wherein the half-time of the potential charged on the member is 10 seconds or less. . 11. A plasma display using the plasma display member according to any one of claims 1 to 10.