JP2007234282A - Plasma display panel and method for fabrication thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reliable, high-definition plasma display panel (PDP) which does not peel from a glass substrate even if an electrode employs lead-free glass frit for environmental conservation. <P>SOLUTION: This PDP comprises a pair of substrates having transparent front surfaces and facing each other in a way that a discharge space is formed between the substrates; a front glass substrate 3 having a display electrode 6 with a scanning electrode 4 and a sustaining electrode 5, and a black stripe 7 in a non-discharge space between the substrate and the display electrode 6; and a terminal outlet 22 at the end of at least one of the scanning electrode 4 and the sustaing electrode 5 for external terminal connection. The scanning electrode 4 and the sustaing electrode 5 are fabricated using a black electrode composed of a transparent electrode and a material identical to that employed for the black stripe 7 formed on the transparent substrate, and a white electrode formed on the black electrode. The width of the black electrode is wider than that of the white electrode at least in the terminal outlet 22. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a plasma display panel used for an image display device or the like.

  Plasma display devices using plasma display panels (hereinafter referred to as PDPs) can achieve high definition and large screens, so products such as 65-inch class television receivers and large public display devices As products become more advanced, products exceeding 100 inches are also planned.

  The PDP is composed of a front plate and a back plate. The front plate is a glass substrate made of sodium borosilicate glass by a float method, a display electrode composed of a striped transparent electrode and a metal bus electrode formed on one main surface, and the display electrode A dielectric layer that covers and acts as a capacitor, and a protective layer made of magnesium oxide (MgO) formed on the dielectric layer. On the other hand, the back plate is formed on a glass substrate, stripe-shaped address electrodes (also referred to as data electrodes) formed on one main surface, a base dielectric layer covering the address electrodes, and a base dielectric layer And a phosphor layer that emits red, green, and blue light respectively formed between the barrier ribs.

  The front plate and the back plate are opposed to each other with the electrode forming side facing each other, and the periphery thereof is sealed with a sealing material, and a mixed gas of neon (Ne) -xenon (Xe) is discharged into the discharge space partitioned by the partition walls. The gas is sealed at a pressure of 400 Torr to 600 Torr.

  The PDP discharges a discharge gas by selectively applying a video signal voltage to a display electrode, and ultraviolet rays generated by the discharge excite each color phosphor layer to emit red, green, and blue light, thereby producing a color image. Display is realized.

  The display electrode provided on the front plate is formed by a pair of stripe-shaped sustain electrodes and scanning electrodes. Each of the sustain electrode and the scan electrode is a metal bus composed of a black electrode provided on the transparent electrode for improving the contrast and a white electrode mainly provided on the black electrode for providing conductivity. An electrode is formed. In the PDP, an image display area and a non-display area are formed in a glass substrate of the front plate, and the end portions of the stripe-like sustain electrodes and scan electrodes are positioned in the non-display area. Further, at least one of the end portions of the striped electrode is provided with a terminal lead-out portion for connecting and wiring to an external power source or the like so as to be connected and wired to an external power source or the like via an FPC or the like. It is composed. Further, a black stripe serving as a light shielding portion is formed between the pair of display electrodes including the sustain electrode and the scan electrode for the purpose of improving the contrast.

  The metal bus electrode formed on the transparent electrode is desirably as thin as possible in order to increase the aperture ratio, but the film thickness is increased in order to ensure conductivity in the longitudinal direction of the striped electrode. It is desirable.

  However, in the structure of such a metal bus electrode, the electrode shape after development due to the exposure depth when forming a thick metal bus electrode, and further, the generation of stress due to shrinkage when firing them, There is a problem that the end of the electrode is peeled off from the glass substrate and the electrode is easily broken. As a method for solving these problems, a method of reducing the film thickness of the end portion of the striped electrode and a method of making the width of the black electrode larger than the width of the white electrode in the display region are disclosed (for example, patents). Reference 1, Patent Document 2, and Patent Document 3).

In addition, from the viewpoint of environmental protection in recent years, it is desired to use glass frit that does not contain a lead component in dielectric layers constituting the PDP, electrodes, and the like.
JP 2003-068216 A JP 2001-236892 A Japanese Patent Laying-Open No. 2005-026138

  However, in recent years, the demand for the resolution of image display of the PDP has increased, and the screen has become higher in definition. In particular, high-definition full-spec high-definition televisions have 1920 (horizontal) x 1080 (vertical) pixels, about six times the number of conventional NTSC pixels, 852 (horizontal) x 480 (vertical). To do. Therefore, when compared with the same 42-inch PDP, the area of one discharge cell is very small, about 1/6, as compared with a conventional NTSC discharge cell. Therefore, in order to increase the aperture ratio in the discharge cell, it is necessary to further narrow the metal bus electrode. Further, like the scanning electrodes of the display electrodes, in order to connect and wire each scanning electrode to the outside, a plurality of scanning electrode end portions are assembled to form a terminal extraction portion, which are connected by FPC. . For this reason, in the high-definition display PDP, the number of electrodes increases, so that the electrode width is reduced with the same screen size. Therefore, there is a problem that the electrode terminal is peeled off from the glass substrate and the reliability is impaired.

  The present invention solves such problems and is a PDP capable of high-definition display. Further, from the viewpoint of environmental protection, even in an electrode using a glass frit that does not contain lead, reliability without peeling from the glass substrate is provided. The purpose is to realize a high PDP.

  In order to solve the above problems, the PDP of the present invention has a pair of substrates that are transparent at least on the front side so as to form a discharge space between the substrates, and has a scanning electrode and a sustain electrode on the front side substrate. A plasma display panel having a display electrode provided with a light-shielding portion at a non-discharge portion between the display electrodes, and a terminal extraction portion for connecting to an external connection terminal at at least one end of the scan electrode and the sustain electrode The scan electrode and the sustain electrode are composed of a transparent electrode and a first conductive layer made of the same material as the light shielding part formed on the transparent electrode and a second conductive layer formed on the first conductive layer, The width of the first conductive layer is made larger than the width of the second conductive layer at least in the terminal extraction portion.

  With such a configuration, a high-definition display is possible, and a highly reliable PDP without peeling of the terminal extraction portion from the glass substrate can be realized.

  Furthermore, it is desirable that the first conductive layer and the second conductive layer contain a binder glass containing bismuth oxide. From the viewpoint of environmental protection, even if a glass frit containing no lead is used for the electrode, It is possible to realize a highly reliable PDP without peeling.

  Further, the display electrode is formed over the image display region and the non-image display region on the front substrate, and the width of the first conductive layer and the second conductive layer formed on the transparent electrode in the image display region are the same. It is desirable. With such a configuration, it is possible to improve the aperture ratio in the image display area and realize a high-quality PDP with a high-definition full-spec high-definition television.

  In the PDP manufacturing method of the present invention, a pair of substrates having at least a transparent front side are disposed to face each other so that a discharge space is formed between the substrates, and a transparent electrode, a first conductive layer, and a first conductive layer are disposed on the front side substrate. A display electrode in which two conductive layers are stacked and a non-discharge portion between the display electrodes are provided with a light-shielding portion, and at least one end of the display electrode is provided with a terminal extraction portion for connection to an external connection terminal A method of manufacturing a plasma display panel, the step of patterning a transparent electrode on a front side substrate, the step of applying a first paste layer that covers the transparent electrode and forms a light shielding portion and a first conductive layer, A step of exposing the first paste layer in accordance with the pattern shape of the light shielding portion and the terminal extraction portion, a step of applying a second paste layer for forming a second conductive layer on the exposed first paste layer, and display Electrode pattern And simultaneously exposing the first paste layer and the second paste layer having a width smaller than the width of the exposed first paste layer at least at the terminal extraction portion, and the exposed first paste layer And developing the second paste layer at the same time.

  According to such a manufacturing method, it is possible to accurately manufacture a PDP capable of high-definition display and having a high reliability without a separation of the terminal extraction portion from the glass substrate with a small number of steps. Become.

  Furthermore, it is desirable that the first conductive layer and the second conductive layer contain a binder glass containing bismuth oxide, and an environmentally friendly PDP can be manufactured with a small number of steps.

  According to the present invention, it is possible to realize a high-reliability PDP capable of high-definition display and free from peeling of the terminal extraction portion from the glass substrate.

    Hereinafter, a PDP according to an embodiment of the present invention will be described with reference to the drawings.

(Embodiment)
FIG. 1 is a perspective view showing the structure of a PDP according to an embodiment of the present invention. The basic structure of the PDP is the same as that of a general AC surface discharge type PDP. As shown in FIG. 1, the PDP 1 is arranged such that a front plate 2 made of a front glass substrate 3 or the like as a front side substrate and a back plate 10 made of a back glass substrate 11 or the like are opposed to each other, and the outer peripheral portion thereof is a glass frit. It is hermetically sealed with a sealing material made of such as. A discharge gas such as neon (Ne) and xenon (Xe) is sealed at a pressure of 400 Torr to 600 Torr in the discharge space 16 inside the sealed PDP 1.

  On the front glass substrate 3 of the front plate 2, a pair of strip-like display electrodes 6 composed of scanning electrodes 4 and sustain electrodes 5 and black stripes 7 serving as light shielding portions are arranged in a plurality of rows in parallel with each other. A dielectric layer 8 serving as a capacitor is formed on the front glass substrate 3 so as to cover the display electrodes 6 and the black stripes 7, and a protective layer 9 made of magnesium oxide (MgO) is formed on the surface. Has been.

  On the back glass substrate 11 of the back plate 10, a plurality of strip-like address electrodes 12 are arranged in parallel to each other in a direction orthogonal to the scanning electrodes 4 and the sustain electrodes 5 of the front plate 2. The body layer 13 is covering. Further, a partition wall 14 having a predetermined height is formed on the base dielectric layer 13 between the address electrodes 12 to divide the discharge space 16. In each groove between the barrier ribs 14, a phosphor layer 15 that emits red, blue, and green light by ultraviolet rays is sequentially applied to each address electrode 12. A discharge cell is formed at a position where the scan electrode 4 and the sustain electrode 5 intersect with the address electrode 12, and the discharge cell having red, blue and green phosphor layers 15 arranged in the direction of the display electrode 6 is used for color display. Become a pixel.

FIG. 2 is a cross-sectional view showing the configuration of the front plate 2 of the PDP in the embodiment of the present invention. 2 is shown upside down from FIG. As shown in FIG. 2, display electrodes 6 and black stripes 7 made of scanning electrodes 4 and sustain electrodes 5 are formed in a pattern on a front glass substrate 3 manufactured by a float process or the like. Scan electrode 4 and sustain electrode 5 are each composed of transparent electrodes 4a and 5a made of indium oxide (ITO), tin oxide (SnO ₂ ), and the like, and metal bus electrodes 4b and 5b formed on transparent electrodes 4a and 5a. Has been. The metal bus electrodes 4b and 5b are used for the purpose of imparting conductivity in the longitudinal direction of the transparent electrodes 4a and 5a, and are formed of a conductive material mainly composed of a silver material. Further, the metal bus electrodes 4b and 5b are composed of black electrodes 41b and 51b serving as the first conductive layer and white electrodes 42b and 52b serving as the second conductive layer.

  The dielectric layer 8 includes a first dielectric layer 81 provided on the front glass substrate 3 so as to cover the transparent electrodes 4a and 5a, the metal bus electrodes 4b and 5b, and the black stripe 7, and a first dielectric layer. The second dielectric layer 82 formed on the layer 81 has a two-layer structure, and the protective layer 9 is further formed on the second dielectric layer 82. As described above, in FIG. 2, the dielectric layer 8 has a two-layer configuration of the first dielectric layer 81 and the second dielectric layer 82, but has a single-layer configuration or a multilayer configuration of three or more layers. Also good.

  FIG. 3 is a plan view showing a configuration of electrodes provided on the front glass substrate 3, and FIG. 4 is a diagram showing details of a portion A in FIG. In FIG. 3 and FIG. 4, the scan electrode 4 and the sustain electrode 5 are shown only by the metal bus electrodes 4 b and 5 b for convenience. As shown in FIG. 3, on the front glass substrate 3 having a rectangular shape, a scanning electrode 4 and a sustaining electrode 5 form a pair to form a display electrode 6, and within the image display area in the broken line area of the figure. A plurality of rows are provided in the short side direction of the front glass substrate 3. Further, as shown in FIG. 4, a black stripe 7 as a light shielding portion is provided between a pair of adjacent display electrodes 6. As shown in FIGS. 3 and 4, the scanning electrode 4 of the display electrode 6 is drawn out to the left end in the drawing of FIG. 3 by the lead-out electrode portion 20, and the terminal lead-out portion 22 with a plurality of scanning electrode terminals 21 as one block. Is configured. Further, the terminal extraction portion 22 is connected to an external connection terminal via an FPC.

  On the other hand, the sustain electrode 5 among the display electrodes 6 is pulled out to the right end in the drawing of FIG. 3 by the lead electrode portion 23 and short-circuited by the short-circuit portion 24 short-circuited with all or a plurality of sustain electrodes 5 to be maintained. The electrode terminal extraction part 25 is connected to the external connection terminal via the FPC.

  5A and 5B are diagrams showing details of the portion B in FIG. 4, FIG. 5A is a plan view, and FIG. 5B is a cross-sectional view taken along line FF in FIG. FIG. 5C is a cross-sectional view taken along the line HH in FIG. 6 is a diagram showing details of the scan electrode terminal 21 in the terminal extraction portion 22 of FIG. 4, and is a cross-sectional view taken along the line CC of FIG.

  As shown in FIG. 5, the scan electrode 4 has a metal bus electrode 4b formed on the transparent electrode 4a, and the sustain electrode 5 has a metal bus electrode 5b formed on the transparent electrode 5a to form a pair of display electrodes 6. Opposing via a predetermined gap G. Further, as described above, each of the metal bus electrodes 4b and 5b is composed of the black electrodes 41b and 51b serving as the first conductive layer and the white electrodes 42b and 52b serving as the second conductive layer. Further, as shown in FIG. 5 (c), at the end of the sustain electrode 5, the metal bus electrode 5 b is extended to the outside of the transparent electrode 5 a and directly formed on the front glass substrate 3. In FIG. 5C, only the end portion of the sustain electrode 5 is shown, but the metal bus electrode 4b extends to the outside of the transparent electrode 4a also at the end portion of the scan electrode 4 located on the right side of FIG. Thus, the structure is formed directly on the front glass substrate 3. Further, the transparent electrodes 4a and 5a are provided only in the image display area shown in FIG. 3, and the dielectric layer 8 is provided up to the outer periphery of the display area so as to cover the scanning electrodes 4 and the sustain electrodes 5. Therefore, the end region where the metal bus electrodes 4 b and 5 b of the scan electrode 4 and the sustain electrode 5 are directly formed on the front glass substrate 3 is covered with the dielectric layer 8. The dielectric layer 8 is formed to the outside of the display area, but is not formed in the terminal extraction portions 22 and 25.

  On the other hand, the terminal lead-out part 22 is formed by extending the metal bus electrode 4 b in the display area to the lead-out electrode part 20 and the scanning electrode terminal 21. The terminal extraction part 22 is composed of about 100 scanning electrode terminals 21 and constitutes one block. 6 shows details of the scanning electrode terminal 21, but as shown in FIG. 6, the metal bus electrode 4b directly formed on the front glass substrate 3 in the terminal extraction part 22 is a black electrode which is a first conductive layer. The width W1 of 41b and the width W2 of the white electrode 42b as the second conductive layer are configured to satisfy W1> W2. That is, the width W1 of the black electrode 41b that is in direct contact with the surface of the front glass substrate 3 is configured to be larger than the width W2 of the white electrode 42b formed thereon.

  The PDP in the embodiment of the present invention is intended for high-definition full-spec high-definition television applications. In this case, the electrode width in the display area of the metal bus electrodes 4b and 5b is about 80 μm, and the wiring pitch of the scanning electrode terminals 21 in the terminal extraction portion 22 is about 420 μm. At this time, in the PDP according to the embodiment of the present invention, the width W2 of the white electrode 42b constituting the scanning electrode terminal 21 is set to 170 μm, and the width W1 of the black electrode 41b below the white electrode 42b is set to about 200 μm.

  Next, a method for manufacturing a PDP will be described. First, the manufacturing method of the front plate 2 will be described. A method of forming the display electrode 6 and the black stripe 7 including the scan electrode 4 and the sustain electrode 5 on the front glass substrate 3 will be described. FIG. 7 is a flowchart showing a manufacturing method for forming the display electrodes 6 and the black stripes 7 on the front glass substrate 3. It is a flowchart after transparent electrode 4a, 5a is pattern-formed on the front glass substrate 3. FIG.

The transparent electrodes 4a and 5a are formed on the entire surface of the front glass substrate 3 by indium oxide (ITO) having a thickness of about 0.12 μm by sputtering, and then formed in stripes having a width of 150 μm by photolithography. Has been. As shown in Step 1 of FIG. 7, one black metal fine particle selected from the group consisting of Fe, Co, Ni, Mn, Ru, and Rh, which are the same material to be formed with the black stripe 7 and the black electrodes 41b and 51b, or 8% by weight of photosensitive organic binder component containing 70% to 90% by weight of metal oxide, 1% to 15% by weight of binder glass, and photosensitive polymer, photosensitive monomer, photopolymerization initiator, solvent, etc. A photosensitive paste consisting of 15% to 15% by weight is applied to the entire surface of the front glass substrate 11 by a printing method or the like to form a black electrode paste layer as a first paste layer. The binder glass of the black electrode paste contains at least 20% by weight to 50% by weight of bismuth oxide (Bi ₂ O ₃ ) so that the softening point of the binder glass exceeds 550 ° C.

  Next, after drying this black electrode paste layer, as shown in step 2, the pattern shape of the black stripe 7 provided in the display area and the pattern shape of the black electrode 41b of the scanning electrode terminal 21 of the terminal extraction portion 22 are obtained. Then, the black paste layer is exposed.

Next, as shown in Step 3, at least silver (Ag) particles are 70 wt% to 90 wt%, binder glass is 1 wt% to 15 wt%, photosensitive polymer, photosensitive monomer, photopolymerization start. The photosensitive organic binder component containing 8% to 15% by weight of the photosensitive organic binder component including the agent and solvent is applied onto the black electrode paste layer by a printing method or the like to form the white electrode paste layer as the second paste layer To do. The binder glass of the white electrode paste layer also contains at least 20% by weight to 50% by weight of bismuth oxide (Bi ₂ O ₃ ) so that the softening point of the binder glass exceeds 550 ° C.

  Next, as shown in Step 4, the black electrode paste layer and the white electrode paste layer are combined with the metal bus electrodes 4b and 5b in the display region, the extraction electrode portion 20, the white electrode 42b of the scanning electrode terminal 21, and The black paste layer and the white paste layer are collectively exposed in accordance with the pattern shapes of the lead electrode portion 23, the short-circuit portion 24, and the sustain electrode terminal extraction portion 25 on the sustain electrode 5 side.

  Next, the exposure in step 4 is repeated as the second exposure in step 5 in order to prevent disconnection due to insufficient exposure of the scan electrode 4 and the sustain electrode 5.

  Next, in step 6, the exposed black paste layer and white paste layer are collectively developed to form a black stripe 7 having a predetermined pattern shape, the scanning electrode 4 including the terminal extraction portions 22 and 25, and the sustain electrode. 5 is formed.

  Next, in Step 7, by baking these at a temperature of 550 ° C. to 600 ° C., in the display region, the black electrodes 41b and 51b having a line width of about 80 μm and the white electrodes 42b and 52b become transparent electrodes 4a, On the scanning electrode terminal 21, the terminal extraction part 22 is formed with the black electrode 41b having a line width of 200 μm and the white electrode 42b having a line width of 170 μm.

The binder glass used for the black electrodes 41b and 51b and the white electrodes 51b and 52b has a bismuth oxide (Bi ₂ O ₃ ) content of 20 wt% to 50 wt% as described above. Boron oxide (B ₂ O ₃ ) is 15 wt% to 35 wt%, silicon oxide (SiO ₂ ) is 2 wt% to 15 wt%, and aluminum oxide (Al ₂ O ₃ ) is 0.3 wt% to 4.4 wt%. It is a glass composed of weight percent. Furthermore, it is preferable that at least one of molybdenum oxide (MoO ₃ ) and tungsten oxide (WO ₃ ) is contained by 0.1 wt% or more and 7 wt% or less. In place of molybdenum oxide (MoO ₃ ) and tungsten oxide (WO ₃ ), cerium oxide (CeO ₂ ), copper oxide (CuO), manganese oxide (MnO ₂ ), chromium oxide (Cr ₂ O ₃ ), oxidation cobalt _{(Co 2 O} 3), vanadium oxide _{(V 2 O} 7), at least one kind of may contain 0.1% to 7 wt% selected from antimony oxide _(Sb 2 _{O 3).}

In the present invention, the softening point temperature of the binder glass is 550 ° C. or higher, and the firing temperature is 550 ° C. to 600 ° C. When the softening point of the binder glass is as low as 450 ° C. to 550 ° C. as in the past, since the firing temperature is nearly 100 ° C. higher than that, the highly reactive bismuth oxide (Bi ₂ O ₃ ) itself is silver ( Ag), black metal fine particles, or an organic binder component in the paste reacts violently to generate bubbles in the metal bus electrodes 4b and 5b and the dielectric layer 8, thereby degrading the dielectric strength performance of the dielectric layer 8. On the other hand, in the embodiment of the present invention, when the softening point of the binder glass is 550 ° C. or higher, the reactivity between silver (Ag), black metal fine particles, or organic components and bismuth oxide (Bi ₂ O ₃ ) is lowered. Thus, the generation of bubbles is reduced. However, if the softening point of the binder glass is 600 ° C. or higher, the adhesion between the metal bus electrodes 4b and 5b and the transparent electrodes 4a and 5a, the front glass substrate 11 or the dielectric layer 8 is not preferable.

Next, the dielectric layer 8 of the front plate 2 is formed so as to cover these electrodes. The dielectric layer 8 has a two-layer structure of a first dielectric layer 81 and a second dielectric layer 82, and the dielectric glass of the first dielectric layer 81 is composed of the following material composition. That is, bismuth oxide (Bi ₂ O ₃ ) is 25 wt% to 40 wt%, zinc oxide (ZnO) is 27.5 wt% to 34 wt%, and boron oxide (B ₂ O ₃ ) is 17 wt% to 36 wt%. %, Silicon oxide (SiO ₂ ) 1.4 wt% to 4.2 wt%, and aluminum oxide (Al ₂ O ₃ ) 0.5 wt% to 4.4 wt%. Furthermore, it contains 5 wt% to 13 wt% of at least one selected from calcium oxide (CaO), strontium oxide (SrO), and barium oxide (BaO), and is selected from molybdenum oxide (MoO ₃ ) and tungsten oxide (WO ₃ ). At least one selected from 0.1% by weight to 7% by weight. In place of molybdenum oxide (MoO ₃ ) and tungsten oxide (WO ₃ ), cerium oxide (CeO ₂ ), copper oxide (CuO), manganese oxide (MnO ₂ ), chromium oxide (Cr ₂ O ₃ ), oxidation cobalt _{(Co 2 O} 3), vanadium oxide _{(V 2 O} 7), at least one kind of may contain 0.1% to 7 wt% selected from antimony oxide _(Sb 2 _{O 3).}

  Dielectric glass composed of these composition components is pulverized with a wet jet mill or a ball mill so that the average particle size is 0.5 μm to 2.5 μm to produce a dielectric glass powder. Next, 55% to 70% by weight of the dielectric glass powder and 30% to 45% by weight of the binder component are kneaded with three rolls to form a first dielectric layer paste for die coating or printing. . The binder component is ethyl cellulose or terpineol or butyl carbitol acetate containing 1% to 20% by weight of acrylic resin. In addition, dioctyl phthalate, dibutyl phthalate, triphenyl phosphate and tributyl phosphate are added to the paste as needed, and glycerol monooleate, sorbitan sesquioleate, homogenol (Kao Corporation) as a dispersant. The printability may be improved by adding an alkylallyl group phosphate ester).

  Next, using this first dielectric layer paste, the front glass substrate 3 is applied by a die coating method or a screen printing method so as to cover the display electrode 6 and dried, and then slightly higher than the softening point of the dielectric glass. Firing is performed at a temperature of 575 ° C to 590 ° C.

Next, the second dielectric layer 82 will be described. The dielectric glass of the second dielectric layer 82 is composed of the following material composition. That is, bismuth oxide (Bi ₂ O ₃ ) 11 wt% to 20 wt%, zinc oxide (ZnO) 26.1 wt% to 39.3 wt%, boron oxide (B ₂ O ₃ ) 23 wt% 32.2 wt%, 1 wt% to 3.8 wt% of silicon oxide (SiO _2), and includes aluminum oxide _(Al 2 _{O 3)} 0.1 wt% to 10.2 wt%. Further, calcium oxide (CaO), strontium oxide (SrO), comprising at least one kind of 9.7 wt% ～29.4 wt% selected from barium oxide (BaO), 0.1 wt cerium oxide (CeO ₂₎ % To 5% by weight.

  Dielectric glass composed of these composition components is pulverized with a wet jet mill or a ball mill so that the average particle size is 0.5 μm to 2.5 μm to produce a dielectric glass powder. Next, 55% to 70% by weight of the dielectric glass powder and 30% to 45% by weight of the binder component are kneaded with three rolls to form a second dielectric layer paste for die coating or printing. . The binder component is ethyl cellulose or terpineol or butyl carbitol acetate containing 1% to 20% by weight of acrylic resin. In addition, dioctyl phthalate, dibutyl phthalate, triphenyl phosphate and tributyl phosphate are added to the paste as needed, and glycerol monooleate, sorbitan sesquioleate, homogenol (Kao Corporation) as a dispersant. The printability may be improved by adding an alkylallyl group phosphate ester).

  Next, using this second dielectric layer paste, printing is performed on the first dielectric layer 81 by screen printing or die coating, followed by drying. Thereafter, a temperature slightly higher than the softening point of the dielectric glass is 550 ° C. Bake at 590 ° C.

The film thickness of the dielectric layer 8 is preferably 41 μm or less in order to secure the visible light transmittance by combining the first dielectric layer 81 and the second dielectric layer 82. The first dielectric layer 81 has a bismuth oxide (Bi ₂ O ₃ ) content of the second dielectric layer 82 in order to suppress the reaction of the metal bus electrodes 4b and 5b with silver (Ag). ₂ O ₃ ) content, which is 25 wt% to 40 wt%. Therefore, since the visible light transmittance of the first dielectric layer 81 is lower than the visible light transmittance of the second dielectric layer 82, the film thickness of the first dielectric layer 81 is set to the film thickness of the second dielectric layer 82. It is thinner.

If the bismuth oxide (Bi ₂ O ₃ ) is 11% by weight or less in the second dielectric layer 82, it is difficult to color, but bubbles are likely to be generated in the second dielectric layer 82, which is not preferable. On the other hand, if it exceeds 20% by weight, coloring tends to occur, which is not preferable for the purpose of increasing the transmittance.

  In addition, the smaller the film thickness of the dielectric layer 8, the more remarkable the effect of improving the panel brightness and reducing the discharge voltage. Therefore, it is desirable to set the film thickness as small as possible within the range where the withstand voltage does not decrease. . From such a viewpoint, in the embodiment of the present invention, the thickness of the dielectric layer 8 is set to 41 μm or less, the first dielectric layer 81 is set to 5 μm to 15 μm, and the second dielectric layer 82 is set to 20 μm to 36 μm. Yes.

  The PDP manufactured in this manner has little coloring phenomenon (yellowing) of the front glass substrate 3 even when a silver (Ag) material is used for the display electrode 6, and bubbles are generated in the dielectric layer 8. It has been confirmed that the dielectric layer 8 excellent in withstand voltage performance is realized.

  On the other hand, the back plate 10 is formed as follows. First, the composition for the address electrode 12 is formed by a method of screen printing a paste containing a silver material on the rear glass substrate 11 or a method of patterning using a photolithography method after forming a metal film on the entire surface. An address electrode 12 is formed by forming a material layer to be formed and firing it at a desired temperature. Next, a dielectric paste is applied to the rear glass substrate 11 on which the address electrodes 12 are formed by a die coating method so as to cover the address electrodes 13 to form a dielectric paste layer. Thereafter, the base dielectric layer 13 is formed by firing the dielectric paste layer. The dielectric paste is a paint containing powdery dielectric glass, a binder, and a solvent.

  Next, a partition wall forming paste containing a partition wall material is applied on the base dielectric layer 13 and patterned into a predetermined shape to form a partition wall material layer, and then fired to form the partition walls 14. Here, as a method of patterning the partition wall paste applied on the base dielectric layer 13, a photolithography method or a sand blast method can be used. Next, the phosphor layer 15 is formed by applying and baking a phosphor paste containing a phosphor material on the base dielectric layer 13 between the adjacent barrier ribs 14 and on the side surfaces of the barrier ribs 14. Through the above steps, predetermined constituent members are formed on the rear glass substrate 11 to complete the rear plate 10.

  The front plate 2 and the back plate 10 having such predetermined constituent members are arranged to face each other so that the scanning electrodes 4 and the address electrodes 12 are orthogonal to each other, and the periphery thereof is sealed with a glass frit. PDP1 is completed by enclosing a discharge gas containing neon (Ne), xenon (Xe), and the like.

  The PDP according to the embodiment of the present invention is intended for high-definition full-spec high-definition television applications. Therefore, the number of pixels is 1920 (horizontal) × 1080 (vertical), which is about 6 times as large as the number of pixels of conventional NTSC, 852 (horizontal) × 480 (vertical). Therefore, when compared with the same 42-inch PDP, the area of one discharge cell is very small, about 1/6, as compared with a conventional NTSC discharge cell. Therefore, in order to increase the aperture ratio in the discharge cell, further narrowing of the metal bus electrode is required, which is as narrow as about 80 μm and increases in number. Therefore, in the terminal extraction portion 22 as compared with the standard definition. The line width of the scanning electrode terminal 21 cannot be increased. Therefore, the scanning electrode terminal 21 peels from the front glass substrate 3 in the terminal extraction part 22, and has the subject that reliability is impaired.

  The metal bus electrodes 4b and 5b are desirably thick in order to ensure conductivity in the longitudinal direction of the striped electrodes, but the black electrodes 41b and 51b and the white electrodes 42b and 52b have the same width. When the film thickness is increased and the line width is further reduced, a phenomenon occurs in which the width of the lower black electrodes 41b and 51b is reduced as an electrode shape after development depending on the exposure depth. As a result, a phenomenon in which the lower black electrodes 41b and 51b are particularly peeled off from the front glass substrate 3 occurs due to the generation of stress due to shrinkage when firing them.

  As described above, in the PDP according to the embodiment of the present invention, the shape of the scanning electrode terminal 21 of the terminal extraction portion 22 that is a region not covered with the dielectric layer 8 is black that is directly bonded to the front glass substrate 3. The width of the electrode 41b is made larger than the width of the white electrode 42b thereon. Further, the black stripe 7 and the black electrodes 41 b and 51 b are made of the same material, and the scanning electrode terminal 21 is exposed simultaneously with the exposure of the black stripe 7. Therefore, the shape of the black electrode 41b on the scanning electrode terminal 21 can be secured with a predetermined width, and the width of the white electrode 42b on the black electrode 41b is reduced, so that the black electrode 41b and the front glass substrate 3 It is possible to counter the stress of the upper white electrode 42b in the firing step with the adhesive force with the interface with the upper surface. Therefore, peeling of the scanning electrode terminal 21 from the front glass substrate 3 can be prevented.

  Furthermore, binder glass containing bismuth oxide is used for the black electrodes 41b and 51b and the white electrodes 42b and 52b, so that an environmentally friendly PDP can be realized. In particular, when the softening point of these binder glasses is set to 550 ° C. or more and 600 ° C. or less, the adhesion between the metal bus electrodes 4b and 5b and the transparent electrodes 4a and 5a and the front glass substrate 3 is improved. Reliability can be further improved.

  Furthermore, in the display area, the black electrodes 41b and 51b and the white electrodes 42b and 52b are collectively exposed so as to have the same width. Therefore, the aperture ratio in the image display area is improved, and high-definition full spec. High-definition televisions and other high-quality PDPs can be realized. In the display area, since the metal bus electrodes 4b and 5b are covered with the dielectric layer 8, there is no problem with the adhesion between the transparent electrodes 4a and 5a and the front glass substrate 3 interface.

  Further, according to the method for manufacturing a PDP of the present invention, a highly reliable PDP capable of high-definition display and having no peeling of the terminal extraction portion from the front glass substrate can be manufactured with a small number of steps and with high accuracy. It becomes possible.

  As described above, according to the PDP and the manufacturing method in the embodiment of the present invention, it is possible to realize an environmentally friendly PDP that is highly reliable and does not contain a lead component.

  As described above, according to the present invention, a highly reliable, environmentally friendly and excellent display quality PDP without peeling of electrode terminals at the terminal extraction portion is realized, which is useful for a display device with a large screen. It is.

The perspective view which shows the structure of PDP in embodiment of this invention Sectional drawing which shows the structure of the front plate of the PDP The top view which shows the structure of the electrode provided on the front glass substrate of the PDP The figure which shows the detail of the A section in FIG. The figure which shows the detail of the B section in FIG. The figure which shows the detail of the scanning electrode terminal in the terminal extraction part of the same PDP The flowchart which shows the manufacturing method which forms a display electrode and a black stripe in the front glass substrate of the manufacturing method of PDP in embodiment of this invention

Explanation of symbols

1 PDP
DESCRIPTION OF SYMBOLS 2 Front plate 3 Front glass substrate 4 Scan electrode 4a, 5a Transparent electrode 4b, 5b Metal bus electrode 5 Sustain electrode 6 Display electrode 7 Black stripe 8 Dielectric layer 9 Protective layer 10 Back plate 11 Back glass substrate 12 Address electrode 13 Base dielectric Body layer 14 Partition 15 Phosphor layer 16 Discharge space 20, 23 Lead electrode part 21 Scan electrode terminal 22 Terminal lead part 24 Short-circuit part 25 Sustain electrode terminal lead part 41b, 51b Black electrode 42b, 52b White electrode
81 First dielectric layer 82 Second dielectric layer

Claims (5)

A pair of substrates transparent at least on the front side are arranged opposite to each other so that a discharge space is formed between the substrates, and the front side substrate includes a display electrode having a scan electrode and a sustain electrode, and a non-discharge portion between the display electrodes A plasma display panel provided with a light-shielding portion, and a terminal lead-out portion for connecting to an external connection terminal at at least one end of the scan electrode and the sustain electrode, wherein the scan electrode and the sustain electrode Are composed of a transparent electrode, a first conductive layer made of the same material as the light-shielding portion formed on the transparent electrode, and a second conductive layer formed on the first conductive layer, at least in the terminal extraction portion A plasma display panel, wherein the width of the first conductive layer is larger than the width of the second conductive layer. The plasma display panel according to claim 1, wherein the first conductive layer and the second conductive layer contain a binder glass containing bismuth oxide. The display electrode is formed across the image display area and the non-image display area on the front substrate, and the width of the first conductive layer and the width of the second conductive layer formed on the transparent electrode in the image display area. The plasma display panel according to claim 1, wherein the plasma display panels are the same. At least a pair of substrates transparent on the front side are arranged so as to form a discharge space between the substrates, and a display electrode in which a transparent electrode, a first conductive layer, and a second conductive layer are laminated on the front side substrate; A method for manufacturing a plasma display panel, wherein a non-discharge portion between the display electrodes is provided with a light shielding portion, and at least one end portion of the display electrode is provided with a terminal lead-out portion for connection to an external connection terminal. ,
Patterning a transparent electrode on the front substrate, applying a first paste layer covering the transparent electrode to form the light shielding part and the first conductive layer, and removing the light shielding part and the terminal Exposing the first paste layer in accordance with the pattern shape of the part, applying a second paste layer for forming the second conductive layer on the exposed first paste layer, and Adjusting the pattern shape and exposing the first paste layer and the second paste layer at the same time with a width smaller than the width of the exposed first paste layer at least in the terminal extraction portion; And a step of simultaneously developing the first paste layer and the second paste layer. 5. The method of manufacturing a plasma display panel according to claim 4, wherein the first conductive layer and the second conductive layer contain binder glass containing bismuth oxide.

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