JP2004219903A - Plasma display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display device whose structure can secure the necessary impact resistance for a plasma display panel even when the base material of an optical filter is a glass plate, a resin, a PET film or the like, and thinner and lower in strength than the conventional one. <P>SOLUTION: The plasma display device has such structure that the optical filter 2 and a shock-absorbing layer 3 composed of silicon gel is provided on an image display face side of the plasma display panel 1. The silicon gel is highly effective in absorbing shocks and has a refractive index nearly equal to that of the glass plate constituting a PDP 1 or the resin, the PET film etc. constituting the base material 4 of the optical filter 2, and thus the necessary impact resistance for the PDP 1 is secured and a plasma display device having structure for high contrast display is realized. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a plasma display device using a plasma display panel known as a thin and relatively large-screen display device.
[0002]
[Prior art]
2. Description of the Related Art In recent years, among color display devices used for image display such as a computer and a television, a plasma display device using a plasma display panel (hereinafter, referred to as a PDP) is a color display device capable of realizing a large, thin, and lightweight. Attention has been paid.
[0003]
In order for a plasma display device to perform full-color display, a PDP is provided with a phosphor layer that emits each of the three primary colors red (R), green (G), and blue (B). The phosphor material is excited by ultraviolet rays generated by a discharge in a discharge cell of the PDP, and generates visible light of each color.
[0004]
Here, the plasma display device is generally provided with an optical filter for the purpose of improving the contrast of the display screen and preventing the PDP from being damaged by external mechanical shock.
[0005]
For the above-mentioned purpose, as the base material of the optical filter, a tempered glass having a thickness of about 2.5 mm is used. In recent years, with the increase in size of the plasma display device, its weight has been required to be reduced. In addition, studies are being made on reducing the thickness, changing the material from glass to a resin material typified by acrylic, and further changing to a film-like material such as a PET film (for example, non-patented). Reference 1).
[0006]
[Non-patent document 1]
Published by Electronic Journal Co., Ltd., "Optical Filter for PDP", Electronic Journal, August 2002, p74-p75
[0007]
[Problems to be solved by the invention]
However, the base material of the optical filter as described above is inferior in strength in comparison with the conventional base material, the impact resistance to the PDP is reduced, and the PDP is damaged by external mechanical shock. There is a case where the problem that it occurs occurs.
[0008]
The present invention has been made in view of the above problems, and even if the strength of the optical filter base material is lower than before, such as a thinner glass plate, resin, or PET film, it is necessary for PDP. It is an object of the present invention to realize a plasma display device having a structure capable of ensuring impact resistance.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a plasma display device according to the present invention has an optical filter and a buffer layer on an image display surface side of the plasma display panel, wherein the buffer layer is formed of silicon gel. Things.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
That is, the invention according to claim 1 of the present invention is a plasma display device having an optical filter and a buffer layer on the image display surface side of a plasma display panel, wherein the buffer layer is made of silicon gel. A display device.
[0011]
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
[0012]
FIG. 1 is a sectional view showing a part of a schematic configuration of a plasma display device according to an embodiment of the present invention.
[0013]
In the plasma display device, an optical filter 2 is provided on the image display surface side of a PDP 1 via a silicon gel as a buffer layer 3.
[0014]
Here, an example of the configuration of the PDP 1 is shown in FIG. FIG. 2 is a sectional perspective view showing an example of a schematic configuration of the PDP 1 used in the plasma display device according to one embodiment of the present invention.
[0015]
Front plate 11 of PDP1 includes a display electrode 15 formed of scan electrodes 13 sustain electrode 14. On the display surface side glass substrate 12, lead oxide (PbO) or bismuth oxide _(Bi 2 _{O 3)} or phosphorus oxide (PO ₄ ) As a main component, and a protection layer 17 (thickness: 500 nm) made of MgO for protecting the dielectric layer 16 from damage by plasma. Here, the scanning electrode 13 and the sustaining electrode 14 are connected to the transparent electrodes 13a and 14a made of a transparent conductive material such as ITO or tin oxide (SnO ₂ ) in order to reduce the electric resistance and secure the translucency. As 13b and 14b, a silver (Ag) thick film (thickness: 2 μm to 10 μm), an aluminum (Al) thin film (thickness: 0.1 μm to 1 μm), or a Cr / Cu / Cr laminated thin film (thickness: 0.1 μm to 1 μm) ) Are sequentially laminated. The dielectric layer 16 is formed by screen printing, die coat printing, or a film laminating method. The protective layer 17 is formed by an electron beam evaporation method, an ion plating method, or a sputtering method.
[0016]
On the other hand, the rear plate 18 is a silver (Ag) thick film (thickness: 2 μm to 10 μm), an aluminum (Al) thin film (thickness: 0.1 μm to 1 μm) or a Cr / Cu / Cr laminate on the rear side glass substrate 19. thin film (thickness: 0.1 to 1 m) and the address electrode 20 made of a low melting glass (thickness mainly composed of lead oxide (PbO), or bismuth oxide _{(Bi 2 O} 3), or phosphorus oxide (PO ₄₎ : 5 μm to 20 μm), a partition 22 made of glass as a main component at a position between the address electrodes 20 on the dielectric layer 21, and three colors for color display between the partition 22. (Red: R, green: G, blue: B) phosphor layers 23R, 23G, 23B. Here, phosphor layers 23R, 23G, the fluorescent materials constituting the 23B, for example, as a red phosphor _{material, (Y x Gd 1-x} ) BO 3: as ^{Eu 3+,} The green fluorescent material, Zn ₂ SiO ₄ : Mn, and BaMgAl ₁₀ O ₁₇ : Eu ²⁺ as a blue phosphor material. A paste obtained by mixing and dispersing these phosphor materials in an organic solvent such as α-terpineol containing 5% to 10% of ethylcellulose or nitrocellulose is applied between the partition walls 22 by screen printing or line jet. , At a temperature of 500 to 550 ° C. The dielectric layer 21 is for improving the adhesion of the phosphor layers 23R, 23G, and 23B on the back plate 18, and is not essential for the operation of the PDP 1.
[0017]
The front plate 11 and the back plate 18 are bonded to each other with the display space 15 and the address electrode 20 facing each other with the discharge space 24 interposed therebetween so that the display electrodes 15 and the address electrodes 20 are orthogonal to each other. That is, the front plate 11 and the back plate 18 form a sealing material made of a low-melting glass material outside the image display area, and are heated to 450 ° C. to 500 ° C. to melt the low-melting glass material as the sealing material. And hermetically sealed.
[0018]
After that, the inside of the PDP 1 is evacuated while being heated to 300 ° C. to 400 ° C., that is, so-called evacuation baking is performed. The gas is sealed at a predetermined pressure.
[0019]
As described above, the discharge space 24 partitioned by the partition wall 22 and at the intersection of the display electrode 15 and the address electrode 20 operates as a discharge cell 25.
[0020]
Then, the phosphor layers 23R, 23G, and 23B are excited by the ultraviolet rays generated by the discharge in the discharge cells 25, the discharge cells 25 of each color are turned on, and the image is formed by a combination of lighting and non-lighting of the discharge cells 25 of each color. Is displayed.
[0021]
The optical filter 2 uses, for example, a PET (polyethylene terephthalate) film as the base material 4, and has a shield part 5 for shielding electromagnetic waves or near infrared rays from the PDP 1 on one side, and a discharge gas A color filter section 6 for separating red, green, and blue colors for reducing unnecessary light emission such as orange light emitted at the time of light emission and improving color display characteristics and contrast of a plasma display device is formed.
[0022]
As the substrate 4 of the optical filter 2, other than using a PET film, any other material such as glass or resin may be used as long as it is a transparent material that does not affect the formation of the shield portion 5 and the color filter portion 6. I don't care.
[0023]
The shield portion 5 is formed, for example, by depositing ITO (Indium-Tin Oxide) on the entire surface as a transparent conductive film, and then fixing the conductive mesh to the transparent conductive film surface of ITO with an adhesive mixed with an infrared absorbing material. (Not shown in the figure). The material of the transparent conductive film may be other than ITO as long as it is transparent and conductive. In addition, as the infrared absorbing agent to be mixed with the adhesive, a known material can be used regardless of whether it is an organic material or an inorganic material. As an example, ITO powder of an inorganic material can be used. By configuring the shield part 5 as described above, it is possible to simultaneously block electromagnetic waves generated from the PDP 1 and shield near-infrared rays.
[0024]
Note that, in the above example, an example in which a conductive mesh is used to shield electromagnetic waves has been described. However, as a method of shielding electromagnetic waves, a transparent conductive film may be formed by sputtering or the like in addition to the method of using a conductive mesh. There is a method of forming such a structure, and such a configuration may be used. Further, as the conductive material of the conductive mesh, it is preferable to use copper in terms of cost. Alternatively, an organic fiber mesh coated with a conductive metal can be used.
[0025]
The color filter unit 6, for example, first forms a black matrix between each color of red, green, and blue by applying, exposing, and developing a photosensitive resin in which a black pigment is dispersed. The dispersed photosensitive resin is similarly coated, exposed, and developed to form a red portion. Then, green and blue are repeated in the same manner to form a green portion and a blue portion, thereby completing the color filter portion 6. Here, as a constituent material of the color filter portion 6, a material generally used as a color filter in a liquid crystal panel or the like can be used. In addition, the order of forming the black matrix and each color portion can be freely selected, and the forming method can be a method such as a printing method other than the photolithography.
[0026]
Further, as the frame 7, a rubber packing made of, for example, silicon can be used. The material of the rubber packing is not limited to silicon as long as it does not adversely affect the silicon gel of the buffer layer 3. In addition, since the silicon gel repeatedly changes in volume such as expansion and contraction depending on the temperature of the PDP 1 and the temperature of the external environment, the frame 7 needs to have elasticity enough to absorb the volume change. It is.
[0027]
The installation of the optical filter 2 on the PDP 1 is performed according to the following procedure.
[0028]
First, a frame body 7 made of rubber packing is arranged on the image display surface side of the PDP 1, that is, on the display surface side glass substrate 12 of the front plate 11, around the outside of the image display area, and fixed with an adhesive. Next, the optical filter 2 and the frame 7 are fixed with an adhesive. Here, when fixing the optical filter 2, it is necessary to align the colors of the color filter section 6 with the phosphor layers 23R, 23G, and 23B of the respective colors formed on the back plate 18 of the PDP 1. As an adhesive for fixing the frame 7 to the PDP 1 and the optical filter 2, for example, a silicon-based double-sided tape is used so as not to adversely affect the silicon gel of the buffer layer 3. Here, a spacer 8 is provided on the outer periphery of the frame 7 in order to keep the interval between the PDP 1 and the optical filter 2 uniform. If necessary, a protective plate 9 made of, for example, an acrylic resin is provided on the surface side of the optical filter 2. Then, after injecting a silicon gel from an opening (omitted in the drawing) provided in the frame 7 or injecting a precursor of the silicon gel, gelation is performed by a predetermined process, and then the opening is sealed. Complete the plasma display device.
[0029]
In the above configuration, the silicon gel as the buffer layer 3 has a high effect on absorbing shock, and therefore, the base material of the optical filter 2 is made of a thinner glass plate, resin, PET film, or the like than before. Even if the strength is lower than before, it is possible to ensure the necessary impact resistance to the PDP 1. In the case where the protection plate 9 is provided, it is possible to further ensure impact resistance. Since the silicon gel has a refractive index substantially equal to that of the glass plate constituting the PDP 1 or the acrylic resin or PET film constituting the base material 4 of the optical filter 2, the interface between the PDP 1 and the buffer layer 3 (silicon gel) is obtained. And the reflectance at the interface between the buffer layer 3 (silicon gel) and the optical filter 2 becomes very small, and the visible light generated in the PDP 1 can pass through the buffer layer 3 and the optical filter 2 efficiently. Thus, a high-contrast display can be obtained.
[0030]
Here, as the protective plate 9, glass or the like can be used in addition to the acrylic resin, but it is preferable to use a resin made from the viewpoint of safety and weight reduction. Further, an antireflection film, an antistatic film, or the like may be formed on the surface of the protection plate 9 as necessary.
[0031]
In the above description, an example in which the color filter section 6 is formed on the optical filter 2 has been described. However, the color filter section 6 is not indispensable to the plasma display device, and the display characteristics and cost are taken into consideration. Its formation can be freely selected.
[0032]
In the above description, the example in which the buffer layer 3 made of silicon gel is provided between the PDP 1 and the optical filter 2 has been described. However, the present invention is not particularly limited to this configuration. The effect of the present invention can be obtained in the same manner even in a configuration in which the buffer layer 3 made of silicon gel is provided between the plurality of optical filters 2.
[0033]
【The invention's effect】
As described above, according to the present invention, even if the strength of the base material of the optical filter is lower than that of the related art, it is possible to ensure the necessary shock resistance to the PDP and to perform a high-contrast display. A plasma display device having a structure can be realized.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a part of a schematic configuration of a plasma display device according to an embodiment of the present invention. FIG. 2 is a schematic configuration of a plasma display panel used in the plasma display device according to an embodiment of the present invention. Cross-sectional perspective view showing one example [Description of reference numerals]
DESCRIPTION OF SYMBOLS 1 Plasma display panel 2 Optical filter 3 Buffer layer (silicon gel)
4 Base material 5 Shield 6 Color filter 7 Frame 8 Spacer 9 Protection plate

Claims (1)

A plasma display device having an optical filter and a buffer layer on the image display surface side of a plasma display panel, wherein the buffer layer is made of silicon gel.

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