JP2010244708A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display panel (PDP) having a mounting structure capable of reducing a connection failure such as migration by improving the moisture resistance of a sealing layer, lack of which causes deterioration of insulating property. <P>SOLUTION: The plasma display panel has a structure in which a terminal electrode 15 formed on a substrate 11 of the plasma display panel is connected to a connecting electrode 16 of a flexible substrate 14 through an anisotropic conductive film 17, and the connection part between the terminal electrode 15 and the connecting electrode 16 and an exposed terminal electrode 13 are covered with a sealing resin layer 18. The sealing resin layer 18 is formed of a photocurable resin including carbon nanotube 20 supporting platinum group. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a plasma display panel (hereinafter referred to as PDP) which is a display device, and more particularly to a mounting structure thereof.

  In recent years, PDPs have attracted attention as color display devices that can be thin and light on a large screen.

  This PDP is broadly divided into AC type and DC type in terms of driving, and there are two types of discharge types, a surface discharge type and a counter discharge type. From the viewpoint of high definition, large screen, and ease of manufacture, At present, the mainstream is a surface discharge type with a three-electrode structure.

  The PDP has a structure in which 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 partition for dividing the discharge space into a plurality of substrates is disposed on the substrate. A plurality of discharge cells are formed by arranging electrodes on the substrate so that discharge occurs in the partitioned discharge space and providing phosphors that emit red, green, and blue light. The phosphor is excited by vacuum ultraviolet light having a short wavelength and red, green, and blue discharge cells emit red, green, and blue visible light, respectively, to perform color display.

  Such a PDP is capable of high-speed display compared to a liquid crystal panel, has a wide viewing angle, is easy to increase in size, and is self-luminous, so that the display quality is high. Recently, it has attracted particular attention among panel displays, and is used for various purposes as a display device at a place where many people gather or a display device for enjoying a large screen image at home.

  Here, FIG. 3 is a cross-sectional view showing a schematic configuration of the mounting structure in the PDP.

  The PDP mounting structure shown in FIG. 3 includes a PDP electrode terminal portion 25 (hereinafter referred to as a terminal electrode 25) and a connection electrode 26 of a flexible substrate 24 (hereinafter referred to as an FPC 24) connected to an anisotropic conductive film 27 (hereinafter referred to as an anisotropic conductive film 27). , ACF27), and electrically connected by thermocompression bonding.

  And the mechanical strength between electrode terminals is hold | maintained with the epoxy material as a binder of ACF27.

  Further, in order to prevent the connection portion of the ACF 27 and the exposed terminal electrode 23 from causing an insulation failure between the electrode terminals due to intrusion of moisture, the terminal electrode 25 formed on the first glass substrate 21 The entire connection portion and a part of the FPC 24 are covered with the first sealing resin layer 28.

Further, the end surface of the first glass substrate 21 and a part of the FPC 24 are covered with the second sealing resin layer 29 to prevent moisture from entering the connection portion and the end portion of the ACF 27 (Patent Document 1). reference).
JP 2000-90840 A

  However, the first sealing resin layer 28 and the second sealing resin layer 29 in the conventional configuration have electrical insulation between the terminal electrodes due to water absorption of the sealing resin under a high temperature and high humidity environment. It had the problem of being reduced. In particular, when the terminal electrode is made of a metal mainly composed of silver, migration occurs between the terminal electrodes, making it difficult to cope with the narrowing of the terminal electrode pitch in recent years.

  The present invention has been made in view of such a current situation, and has improved a moisture resistance of a sealing layer that causes a decrease in insulation, and thus a mounting structure capable of reducing connection failures such as migration. An object is to provide a provided PDP.

  In order to achieve the above object, the PDP of the present invention has a terminal electrode formed on a substrate of the PDP and a connection electrode of a flexible substrate connected via an anisotropic conductive film, and the terminal electrode and the connection electrode And the exposed terminal electrode is a PDP having a structure covered with a sealing resin layer, and the sealing resin layer is made of a photocurable resin containing a carbon nanotube carrying a platinum group. It is formed.

  According to the present invention, since the moisture resistance of the sealing layer that causes a decrease in insulation is improved, a PDP having a mounting structure capable of reducing connection failures such as migration is provided. Can do.

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

  First, the structure of the PDP will be described with reference to FIG. FIG. 1 is a partially sectional perspective view showing a schematic structure of a PDP.

  As shown in FIG. 1, the PDP is configured by arranging a glass front substrate 1 and a rear substrate 2 so as to face each other so as to form a discharge space therebetween. On the front substrate 1, a plurality of scanning electrodes 3 and sustaining electrodes 4 constituting display electrodes are formed in parallel with each other. Scan electrode 3 and sustain electrode 4 are each composed of a transparent electrode and a bus electrode made of silver.

  A dielectric layer 5 is formed so as to cover the scan electrode 3 and the sustain electrode 4, and a protective layer 6 is formed on the dielectric layer 5.

  A plurality of silver-made data electrodes 8 covered with an insulating layer 7 are provided on the back substrate 2, and a grid-like partition wall 9 is provided on the insulating layer 7. A phosphor layer 10 is provided on the surface of the insulator layer 7 and on the side surfaces of the partition walls 9. The front substrate 1 and the rear substrate 2 are arranged to face each other so that the scan electrodes 3 and the sustain electrodes 4 and the data electrodes 8 cross each other, and in the discharge space formed between them, for example, neon And a mixed gas of xenon. Note that the structure of the panel is not limited to the above-described structure, and for example, a structure having a stripe-shaped partition may be used.

  FIG. 2 is a schematic cross-sectional view schematically showing a mounting structure in the PDP according to the embodiment of the present invention. As shown in FIG. 2, the mounting structure in the PDP according to the embodiment of the present invention is such that the first glass substrate 11 and the second glass substrate 12 forming a pair are sealed with a sealing material 19, and the first glass substrate 11 is sealed. A terminal electrode 15 mainly composed of silver is formed on the substrate 11 and is thermocompression-bonded via a connection electrode 16 of a flexible substrate 14 (hereinafter referred to as FPC 14) and an anisotropic conductive film 17 (hereinafter referred to as ACF 17). It is connected.

  Here, the combination of the first glass substrate 11 and the second glass substrate 12 in FIG. 2 is the combination of the front substrate 1 and the rear substrate 2 in FIG. 1, and the terminal electrode 15 is the scanning electrode 3. Or a bus electrode constituting the sustain electrode 4 or a data electrode 8.

  The FPC 14 is formed by forming connection electrodes 16 on a base film made of a polyimide film at the same wiring interval as the terminal electrodes 15. The connection electrodes 16 form a nickel base film on a copper foil and form a gold film on the surface thereof. It has a structure.

  The terminal electrode 15 and the connection electrode 16 of the FPC 14 are electrically connected by being brought into contact with each other via an ACF 17 having a particle diameter of 3 to 11 μm and thermocompression bonding.

  The connecting portion and the exposed terminal electrode 13 are covered with a sealing resin layer 18. Specifically, for example, a photocurable sealing resin mainly composed of an acrylic resin is applied in a predetermined amount with a dispenser so as to cover a part of the connection portion and the exposed terminal electrode 13 and the FPC 14, and then the resin is applied. The sealing resin layer 18 is formed by curing.

  Here, carbon nanotubes 20 carrying a platinum group are added to the sealing resin layer 18. The carbon nanotubes 20 supporting the platinum group preferably have a volume ratio of 0.01 to 1% of the photocurable resin. The platinum group to be supported is preferably palladium rich in hydrogen storage.

  Table 1 shows the results of performing a moisture resistance test under lighting on the PDP thus produced in a high humidity environment of 60 ° C. and 95%.

  As shown in Table 1, the results obtained were that the addition of carbon nanotubes carrying a platinum group was less likely to cause a decrease in insulation resistance between the terminal electrodes than when no addition was made.

  This is because, in the mounting structure shown in FIG. 1, moisture in the vicinity of the electrode under high humidity and energization and hydrogen ions generated under energization are adsorbed by palladium and carbon nanotubes, It is considered that the concentration of hydrogen ions and other free ions can be reduced, and as a result, connection failures such as migration can be reduced.

  As described above, the present invention is useful for providing a large-screen, high-definition PDP.

Partial cross-sectional perspective view showing schematic configuration of plasma display panel 1 is a schematic cross-sectional view schematically showing a mounting structure in a PDP according to an embodiment of the present invention. Sectional drawing which shows schematic structure of the mounting structure in a plasma display panel

DESCRIPTION OF SYMBOLS 11 1st glass substrate 12 2nd glass substrate 13 Exposed terminal electrode 14 Flexible substrate 15 Terminal electrode 16 Connection electrode 17 Anisotropic conductive film 18 Sealing resin layer 19 Sealing material 20 Carbon nanotube carrying platinum group

Claims (1)

The terminal electrode formed on the substrate of the plasma display panel and the connection electrode of the flexible substrate are connected via an anisotropic conductive film, the connection portion between the terminal electrode and the connection electrode, and the exposed terminal electrode Is a plasma display panel having a structure coated with a sealing resin layer, wherein the sealing resin layer is formed of a photocurable resin containing a carbon nanotube carrying a platinum group. Display panel.

Images