JP2007257982A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display panel in which a sealing portion is hardly peeled at the interface and has a high adhesive strength even if bismuth or tin-phosphoric acid based frit is used as a sealing member. <P>SOLUTION: In this plasma display panel, a pair of glass substrates 4, 9 are disposed in opposed positions to each other with a discharge space 14 in between them, and are sealed with a sealing member 16. The sealing member 16 is made of a material including bismuth or phosphorous, and the pair of glass substrates 4, 9 have, at least either side, a convexo-concave portion 17 in a region where the sealing member 16 is arranged. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a plasma display panel (hereinafter abbreviated as PDP).

  Frit glass (hereinafter abbreviated as frit) is used as a material for bonding inorganic materials such as glass, ceramics, and metals. In particular, in the case of a PDP having a structure in which two glass substrates are bonded to each other, the inside of the panel is decompressed, and therefore, a high adhesive strength is required for a frit used as a sealing member. In the PDP, frit is generally arranged at the peripheral portion of the panel as described later, and plays a role of preventing outside air from entering the panel. If the adhesive strength of this frit is low, the frit and glass substrate will crack due to vibration or drop impact during transportation (interfacial delamination), and air will enter the panel and part of the panel will not light up. Or in severe cases it may not light up at all.

  The PDP is a display that displays an image by exciting and emitting phosphors with ultraviolet rays generated by gas discharge. The members constituting this PDP are mainly made of low-melting glass, and these members are formed by repeating printing and firing processes. Because it is a manufacturing process by repeating such printing and baking, the softening point of the low melting point glass used as it becomes a member formed in a later step is lower than that formed earlier. Has been adjusted. Thus, when forming a plurality of low melting point glass members in order, it is necessary to adjust the softening point in a wide temperature range. For this reason, in PDP, there are many lead glasses as the above low melting point glass. Have been used.

  However, in recent years, toxicity of lead to human bodies and environmental pollution have been considered as problems, and materials that replace lead glass have been studied.

Since the frit as a sealing member used at the end of the PDP process has the lowest softening point and a high lead content, it is urgent to develop a frit that does not use lead glass. As a frit material not using lead, there is bismuth (Bi) glass or tin-phosphate glass (see Patent Document 1).
JP 2004-238273 A

  The problem with Bi-based or tin-phosphate-based frit that does not contain lead is that the adhesion strength to the glass substrate is lower than that of conventional frit containing lead, and interfacial peeling is likely to occur in the peel test. If the frit is easily peeled off at the interface, the adhesion between the frit and the glass substrate is likely to occur due to vibration and impact during transportation as described above. In this case, air enters the panel and causes malfunction. .

  The present invention has been made in order to solve the above-described problems. The object of the present invention is to prevent vibration and impact during transportation even when a Bi-based or tin-phosphate-based frit is used as a sealing member. Therefore, it is an object of the present invention to provide a PDP having a sealing portion in which interfacial peeling hardly occurs and the adhesive strength is increased.

  In order to achieve the above object, the invention described in claim 1 of the present invention is provided with two glass substrates that are arranged to face each other with a discharge space and bonded by a sealing member, and the sealing member contains bismuth or phosphorus. It is comprised from the material which contains, The uneven | corrugated | grooved part was provided in the arrangement position of the said sealing member of at least one of the said 2 glass substrate, and this raises the adhesive strength of a sealing part.

  According to a second aspect of the present invention, a partition for forming the discharge space is provided on at least one of the two glass substrates, and the partition is formed at the position where the sealing member is disposed. A part is formed.

  The invention described in claim 3 of the present invention is characterized in that the concavo-convex portion provided at the arrangement position of the sealing member is provided on at least the long side portion of the glass substrate.

  The invention described in claim 4 of the present invention is characterized in that the concavo-convex portion provided at the arrangement position of the sealing member is made of a material having a smaller bismuth content than the sealing member.

  According to the present invention, even when Bi-based or tin-phosphate-based frit is used as a sealing member, interface peeling hardly occurs due to vibration or impact during transportation, and the sealing portion has an increased adhesive strength. A PDP can be provided.

  Hereinafter, a PDP according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7, but the embodiment of the present invention is not limited to this.

(Embodiment 1)
The structure of the PDP according to the first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is an external view of a PDP according to Embodiment 1 of the present invention, and FIG. 2 is a perspective view showing a central portion of the PDP in cross section. 3 shows a cross-sectional view of the PDP according to the first embodiment of the present invention, FIG. 3 (a) is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 (b) is a cross-sectional view taken along line BB in FIG. . FIG. 4 is an enlarged view of a corner portion of the back plate of the PDP according to the first embodiment of the present invention, and corresponds to an enlarged view of a portion C in FIG. 5 shows a cross-sectional view of a PDP not carrying out the present invention, FIG. 5 (a) is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 5 (b) is a cross-sectional view taken along the line BB in FIG.

As shown in FIGS. 1 and 2, the panel 1 is configured by arranging a glass front plate 2 and a back plate 3 so as to face each other. The front plate 2 includes a plurality of scan electrodes 5 and sustain electrodes 6 that form display electrodes on a glass substrate 4 in pairs in parallel with each other. Usually, these electrodes 5 and 6 are composed of two types of films, a transparent conductive film and a bus electrode. An ITO film or a Nesa (SnO ₂ ) film is used as the material for the transparent conductive film, and a silver film or a three-layer structure film of Cr / Cu / Cr is used as the material for the bus electrode. A dielectric layer 7 (thickness: 30 μm to 50 μm) is formed on scan electrode 5 and sustain electrode 6, and protective layer 8 (thickness: 0.5 μm to 2 μm) is further formed on dielectric layer 7. Yes.

  The dielectric layer 7 is formed by applying a paste containing glass powder for dielectric by a printing method and baking it, and a bismuth-based material (Bi-Zn-B-Si-O-based) is used as a material to be used. ), Zinc borate (Zn—B—Si—O), lead-based materials (Pb—B—Si—O), and the like. The protective layer 8 is for protecting the dielectric layer 7 from damage due to electric discharge, and is composed of a polycrystalline MgO (magnesium oxide) film having excellent anti-sputtering properties (thickness: 500-1000 nm). As a film forming method, a general thin film forming method such as an electron beam evaporation method, a CVD method, or a sputtering method is used.

  Next, the back plate 3 will be described. The back plate 3 is provided with a plurality of data electrodes 10 on a glass substrate 9, and an insulator layer 11 (thickness: 5 μm to 20 μm) is provided on the data electrode 10 for the purpose of insulating each part. On the insulator layer 11, a grid-like or striped partition wall 12 is provided (in each figure, a stripe-shaped partition wall is shown). The partition wall 12 is formed by applying a photosensitive glass paste, pattern exposure, development, and baking, or by sandblasting after applying the glass paste. The material which comprises the partition 12 is Zn-B-Si-O type | system | group, Si-Li-O type | system | group glass, Bi-Si-BO type | system | group glass, for example. The insulator layer 11 is also formed by the same material and process as the dielectric layer 7 on the front plate 2 side, and the phosphor layer 13 is formed on the surface of the insulator layer 11 and the side surfaces of the partition walls 12. In the phosphor layer 13, phosphors of three colors (red: R, green: G, blue: B) for color display are coated in each groove formed by a pair of partition walls 12.

  The front plate 2 and the back plate 3 formed as described above form a discharge space 14 therebetween, and the scan electrode 5, the sustain electrode 6 and the data electrode 10 are arranged to face each other. And it adhere | attaches with the sealing member 16 apply | coated to the sealing member arrangement position 15 of the front plate 2 or the back plate 3. FIG. For example, a mixed gas of neon (Ne) and xenon (Xe) is sealed in the discharge space 14 as a discharge gas.

  Here, the sealing member 16 is made of a paste obtained by kneading glass powder containing Bi with a resin and a solvent. And as said adhesion process, the sealing member 16 is apply | coated to the sealing member arrangement position 15 by screen printing or the injection method, and after heating to such an extent that a resin component can be removed, the front plate 2 and the back plate 3 are overlapped, It is formed by heating and bonding to a temperature at which the glass powder softens. At this time, the sealing member arrangement position 15 is generally located in the periphery of the front plate 2 and the back plate 3.

  Resins used for the paste are acrylic resin, ethyl cellulose, nitrocellulose and the like, and isoamyl acetate, terpineol and the like are used as the solvent.

  The Bi content in the sealing member 16 is desirably set to 50 to 80 wt% so as not to affect the previously formed member. In addition to Bi, silicon (Si) and oxygen (O) are always included in the sealing member 16 in addition to Bi, and boron (B) and zinc (Zn) are also included. Further, elements such as aluminum (Al) are appropriately mixed. Further, the sealing member 16 has a high softening point glass or ceramic powder made of an Al—Si—Mg—O-based material called a filler within a range of 5 to 20 wt% by weight in order to increase its own strength. Are mixed.

  In the present invention, as shown in FIGS. 3 and 4, an uneven portion 17 is formed as a part of the partition wall at the sealing member arrangement position 15 of the back plate 3 when the partition wall 12 is formed.

  On the other hand, for comparison, a panel 501 in which the uneven portion 17 was not formed at the sealing member arrangement position 15 as shown in FIG. However, except for the concavo-convex portion 17, other configurations and materials of the panel 501 were the same as those of the panel 1 of the present invention.

  The front plate 2 and the back plate 3 were pulled on these panels 1 and 501 and the peel strength test at the sealing member arrangement position 15 was performed (30 or more sheets were performed on each panel). As a result, the panel 501 caused interface peeling between the sealing member 16 and the front plate 2 and the back plate 3 with a slight force with respect to the panel 1. This suggests that the sealing member 16 is likely to crack at the interface with the front plate 2 or the back plate 3 due to vibration or impact during panel transportation.

  Although the cause of the above difference in strength is speculated, the Bi-based sealing member has a low adhesive strength with the glass substrate, but by providing an uneven portion on at least one of the substrates as in the present invention, sealing is achieved. It is considered that the bonding area between the stop member and the substrate is increased and the bonding strength is improved.

(Embodiment 2)
The structure of the PDP according to the second embodiment of the present invention will be described with reference to FIGS.

  6 shows a cross-sectional view of a PDP according to Embodiment 2 of the present invention, FIG. 6 (a) is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 6 (b) is a cross-sectional view taken along the line BB in FIG. 7 shows a cross-sectional view of a PDP not carrying out the present invention. FIG. 7 (a) is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 7 (b) is a cross-sectional view taken along the line BB in FIG.

  In the second embodiment of the present invention, in the panel 1 produced in the first embodiment, the protective layer 8 and the dielectric layers 7 and 11 are formed at the sealing member arrangement position 15 where the sealing member 16 is formed as shown in FIG. A panel 601 in which no is formed was manufactured. In addition, as shown in FIG. 7, a panel 701 without the uneven portion 17 was also prepared for comparison. As a result of performing a peel strength test on these panels in the same manner as in the first embodiment, the panel 701 caused interface peeling between the sealing member 16 and the front plate 2 and the back plate 3 with a slight force with respect to the panel 601. .

  The cause of the above difference in strength is that, as in the first embodiment, the Bi-based sealing member has a low adhesive strength with the glass substrate, but at least one of the substrates is provided with an uneven portion as in the present invention. Thus, it is considered that the bonding area between the sealing member and the substrate is increased, and the bonding strength is improved.

  Other embodiments will be described below.

  In the said embodiment, when using Bi-type glass for the material which comprises the uneven | corrugated | grooved part 17, it is preferable that Bi content shall be at least less than 50 wt%, or it becomes lower than Bi content of a sealing member. . Otherwise, the adhesive strength between the concavo-convex portion 17 and the glass substrates 4 and 9 is lowered, and the effect of improving the adhesive strength of the sealing portion as described above is diminished.

  Moreover, as a material used for a sealing member, it confirmed that the same effect was obtained also in Sn-PO glass and Zn-Sn-PO glass other than said Bi glass.

  In the above embodiment, the concavo-convex portion 17 is provided in the entire region of the sealing member arrangement position 15. However, the present invention is not limited to this embodiment. can get. In particular, since it was the long side that was weak in the peeling test of the panel 501 and the panel 701, even if the uneven portion 17 is formed only on the long side, the effect of improving the adhesive strength similar to the panel 1 and the panel 601 is achieved. Is obtained.

  The structure of the panel is not limited to that shown in the above embodiment, and for example, it may be provided with a grid-like partition wall. Further, in FIGS. 3, 4, and 6, the number of convex portions at the short-side sealing member arrangement position 15 is two to three, but this is for convenience and the number is not limited thereto. .

  In the above embodiment, the concavo-convex portion 17 is formed at the same time as the formation of the partition wall 12. However, the same effect can be obtained.

  As can be seen from the above, the PDP of the present invention has high sealing portion strength and excellent reliability.

  As described above, according to the present invention, it is a useful invention capable of obtaining a PDP having a sealing portion with increased adhesive strength.

1 is an external view of a plasma display panel according to Embodiment 1 of the present invention. The perspective view which showed the central part of the plasma display panel in the section 2A and 2B are cross-sectional views of the plasma display panel, in which FIG. 1A is a cross-sectional view taken along the line A-A in FIG. 1, and FIG. 1 is an enlarged view of the corner portion of the back plate of the plasma display panel, and is an enlarged view of portion C of FIG. 1A and 1B are cross-sectional views of a plasma display panel not implementing the present invention, wherein FIG. 1A is a cross-sectional view taken along line AA in FIG. 1 and FIG. 1B is a cross-sectional view taken along line BB in FIG. 2A and 2B are cross-sectional views of a plasma display panel according to Embodiment 2 of the present invention, in which FIG. 1A is a cross-sectional view taken along line AA in FIG. 1 and FIG. 1B is a cross-sectional view taken along line BB in FIG. 1A and 1B are cross-sectional views of a plasma display panel not implementing the present invention, wherein FIG. 1A is a cross-sectional view taken along line AA in FIG. 1 and FIG. 1B is a cross-sectional view taken along line BB in FIG.

Explanation of symbols

1,601 Plasma display panel (panel)
2 Front plate 3 Back plate 4, 9 Glass substrate 7 Dielectric layer 8 Protective layer 11 Insulator layer 15 Sealing member arrangement position 16 Sealing member 17 Concavity and convexity

Claims (4)

Disposed to provide a discharge space, and provided with two glass substrates bonded by a sealing member, the sealing member is made of a material containing bismuth or phosphorus, and the sealing of at least one of the two glass substrates A plasma display panel characterized in that an uneven portion is provided at a position where the stop member is arranged. 2. An uneven portion is formed by providing a partition wall for forming the discharge space on at least one of the two glass substrates, and forming the partition wall at a position where the sealing member is disposed. 2. A plasma display panel according to 1. The plasma display panel according to claim 1, wherein the uneven portion provided at the arrangement position of the sealing member is provided on at least a long side portion of the glass substrate. 2. The plasma display panel according to claim 1, wherein the concavo-convex portion provided at the position where the sealing member is disposed is made of a material having a lower bismuth content than the sealing member.

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