JP2003249176A - Impact-resistant film for flat display panel and flat display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an impact-resistant film which prevents fracture and scattering of glass pieces when a display panel experiences an impact and can be made lighter and thinner. <P>SOLUTION: The impact-resistant film 10 for a flat display panel, which is bonded to a front glass 12 of a main body of a flat display panel 11, comprises a first layer 13 on the front glass side made of transparent synthetic resin of which shear elastic modulus is between 1×10<SP>3</SP>Pa and 1×10<SP>4</SP>Pa and a second layer 14 on the observation side made of transparent synthetic resin of which shear elastic modulus is between 1×10<SP>6</SP>Pa and 1×10<SP>8</SP>Pa. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact resistant film for a flat display panel, which is attached to the front glass of a flat display panel to prevent the windshield from being crushed by an impact, and which can be reduced in weight and thickness. And a flat display panel using the same.

[0002]

2. Description of the Related Art In recent years, a plasma display panel (hereinafter abbreviated as PDP), which has advantages such as a large screen panel and clear full-color display, has been receiving attention. The PDP performs full-color display by selectively causing a fluorescent material to discharge and emit light within a large number of discharge cells formed between two glass plates.

FIG. 1 is a diagram illustrating the structure of a PDP. In the PDP shown by reference numeral 1 in this figure, a front glass 2 and a rear glass 3 are arranged opposite to each other. A rare gas such as xenon is filled in the gap between the three under reduced pressure. The front glass 2 is provided with a discharge electrode 4, a dielectric film 5, a protective film 6, etc., and the rear glass 3 is provided with partition walls 7, phosphors 8A, 8B, 8C, address electrodes 9, etc. The front glass 2 of the PDP 1 is damaged and distorted when electrodes and thin films made of various materials are laminated and formed, and its strength is remarkably reduced as compared with the original glass plate. Further, since the partition walls formed on the back glass and the irregularities of the phosphor are in contact with each other, stress concentration is likely to occur at their contact portions.

Conventionally, in order to prevent damage to the front glass of a flat display panel such as a PDP, a protection plate made of acrylic resin, tempered glass or the like is provided in front of the front glass with a space of several millimeters between them. It prevented the display panel from being shocked. However, such a protective structure has a problem that it hinders reduction in weight and thickness of the flat display panel. Furthermore, since there is a space between the front glass of the panel and the protective plate, there is a problem that image quality is deteriorated due to reflection of external light from a fluorescent lamp or the like, and slight vibration causes image distortion.

Various techniques for preventing damage to the front glass of a flat display panel have been proposed so far, for example, Japanese Patent Laid-Open No. 2000-123751 discloses:
Techniques have been proposed for improving strength by increasing the thickness of the front glass. However, this structure has a problem in that the effect of protecting against impact is insufficient and the weight of the panel increases. In addition, JP-A-2000-156182
JP-A-11-119667, JP-A-11-119667
In Japanese Patent Application Laid-Open No. 119668 and Japanese Patent Application Laid-Open No. 11-119669, a structure in which a protective plate is bonded to a front glass of a panel via an adhesive layer is proposed. However, in this structure, a shock is easily transmitted to the front glass, There is a problem that the effect of preventing breakage of glass cannot be obtained sufficiently.

As another conventional technique, Japanese Patent Laid-Open No. 2001-2001
In JP-A-266759, a crack preventing layer (shock absorbing layer) B and a shatter preventing layer A formed on the front glass of a flat display panel are made of transparent synthetic resin via a transparent adhesive layer. Impact in which two layers are laminated and the shear modulus of the shatterproof layer A is 2 × 10 ⁸ Pa or more and the shear modulus of the crack prevention layer B is in the range of 1 × 10 ⁴ to 2 × 10 ⁸ Pa. A relaxation laminate (hereinafter referred to as a conventional laminate) has been proposed.

[0007]

However, the above-mentioned conventional laminated body has been insufficient in providing impact resistance to a front glass such as PDP. In the examples of the publication, a so-called "untreated" glass plate, on which electrodes and thin films made of various materials are not formed, is used as the glass plate, and an adhesive, a shock absorbing layer, and a shatterproof layer are used for the glass plate. Although the layers are sequentially laminated and the hard balls are dropped to test for the presence of impact resistance, as described above, the actual front glass of the PDP is
As a result of laminating and forming electrodes and thin films made of various materials, the impact resistance is significantly deteriorated as compared with untreated glass, and the glass tends to break. As described above, it has not been proved that the conventional laminated body has a sufficient impact resistance effect when bonded to the front glass of the PDP whose impact resistance is significantly weakened as compared with the untreated glass plate. Then, as will be described in detail in Examples to be described later, a glass substrate on which electrodes, a dielectric film, and the like are formed on a glass plate and a front glass of a PDP is assumed, and the same material as that described in the Examples of the publication is used. When three layers having different thicknesses were laminated and the impact resistance was measured by applying a predetermined impact force with a spring impact hammer, it was found that this one lacks impact resistance (see Example 7 of Examples). . Therefore, the conventional laminate has weakened impact resistance P
It was not sufficient as an impact resistant film for protecting the front glass of a flat display panel such as DP.

The present invention is an anti-shock film for a flat display panel, which can be attached to the front surface of a flat display panel to prevent the glass of the panel from shattering and shattering when it is shocked, and can be made lighter and thinner. (Less than,
Abbreviated as impact resistant film. ) And a flat display panel using the same.

[0009]

In order to achieve the above object, the present invention is an impact resistant film to be bonded to the front glass of a flat display panel body, which has a shear modulus of 1 × 10 ³ Pa or more. It is made of a transparent synthetic resin of less than × 10 ⁴ Pa and has a first layer on the front glass side of the flat display panel and a shear elastic modulus of 1 × 10 ⁶ Pa or more and 1 ×.
An impact resistant film for a flat display panel, comprising a transparent synthetic resin having a pressure of less than 10 ⁸ Pa and including a second layer on the viewing side of the first layer. The impact resistant film of the present invention has a shear modulus of 1 × 10 ⁶ P.
The shear modulus of elasticity is 1 × 10 ³ Pa or more between the second layer made of a relatively hard synthetic resin having a or more and less than 1 × 10 ⁸ Pa and the front glass of the flat display panel body.
Since the first layer made of a soft synthetic resin of less than × 10 ⁴ Pa is provided, the impact caused by the first layer provided between the hard second layer and the windshield when the impact is received. It is possible to provide a shock-resistant film that is light-weight and thin and has excellent shock resistance because it can prevent the shock force from being absorbed and transmitted to the windshield.

The impact resistant film of the present invention preferably has a structure in which the second layer is laminated on the visible side surface of the first layer. Further, the first layer is preferably an adhesive resin material that is directly bonded to the front glass of the flat display panel. Furthermore, it is preferable that the thickness of the first layer is in the range of 1.0 mm to 4.0 mm and the thickness of the second layer is in the range of 0.05 mm to 3.0 mm. An electromagnetic wave shielding layer is provided on the visible side of the second layer,
At least one layer selected from the group consisting of a near infrared absorption layer and an antireflection layer, and an adhesive layer for adhering these layers may be laminated.

The present invention further provides a flat display panel obtained by bonding the above-mentioned impact resistant film to the front glass of the flat display panel body directly or via a transparent adhesive layer.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 is a view showing an embodiment of the impact resistant film of the present invention, and the impact resistant film 10
Is the shear modulus G ′ (hereinafter,
Abbreviated as shear modulus. ) Is 1 × 10 ³ Pa or more 1 ×
A first layer 13 made of a transparent synthetic resin of less than 10 ⁴ Pa and provided on the front glass 12 side of the flat display panel body 11, and a shear modulus of 1 × 10 ⁶ Pa or more and less than 1 × 10 ⁸ Pa. Made of transparent synthetic resin of
Second layer 14 laminated on the visible side surface of the layer 13.

The shear elastic modulus (G ') is a measured value of the shear elastic modulus G'at 25 ° C. ± 3 ° C. at a frequency of 1 Hz using a dynamic viscoelasticity measuring device DMS120 manufactured by Seiko Instruments Inc. In general, the tensile elastic modulus E = 3G '(shear elastic modulus), and the tensile elastic modulus E is about three times the shear elastic modulus.

[First Layer] The first layer 13 provided on the front glass 12 side of the flat display panel body 11.
Is made of a transparent synthetic resin having a shear modulus of 1 × 10 ³ Pa or more and less than 1 × 10 ⁴ Pa. Such synthetic resin is
Urethane resin, acrylic resin, silicone resin,
Phenolic resin, urea resin, epoxy resin, fluorine resin, vinyl resin, butadiene resin, neoprene resin,
Styrene resin, acrylonitrile resin, etc. alone or 2
It can be appropriately selected and used from those obtained by blending or copolymerizing different kinds of resins or more, but the impact resistance,
Anti-scattering glass, transparency, self-healing, heat resistance,
Considering the balance of durability and the like, urethane resins and silicone resins, which are thermosetting resins, are most preferable. By using such a thermosetting resin, even when the impact resistant film 10 is applied to the PDP in which the front glass 12 is exposed to a relatively high temperature, the first layer 13 in contact with the front glass 12 is Excellent impact resistance can be maintained for a long period of time without causing problems such as softening and melt flow.

The shear modulus of this first layer 13 is 1 ×
10 ³ Pa or more and less than 1 × 10 ⁴ Pa, preferably 4 × 10
³ is a Pa~8 × 10 ³ Pa. By setting the shear modulus in the above range, the impact force transmitted from the second layer 14 side to the front glass 12 is efficiently dispersed and absorbed, and the front glass 12 of the flat display panel body 11 is prevented from being broken. Can be prevented. Further, by selecting the shear elastic modulus in the above range, the first layer 13
Since it itself has a property of being easily deformed, by laminating it with the front glass 12 and the second layer 14, both the interface with the front glass 12 and the interface with the second layer 14 become smooth surfaces, and It is possible to impart excellent transparency to the impact resistant film 10. Further, among thermosetting resins having a shear elastic modulus in the above range, those having an adhesive property, for example, a silicone film manufactured by Geltec Co., a resin material such as a product name αGEL and θ-7, can be used for the front glass 12. It is preferable that it is arranged on the visible side surface, the second layer 14 is placed on the visible side surface, and pressure processing is performed using a rubber roll or the like so that the second glass layer 14 can be easily laminated on the visible side surface of the front glass 12 and the manufacturing process can be greatly simplified. First layer 13
If the adhesiveness of the
On both sides of the layer 13 of the front glass 12 and the second layer 14
Can be configured to join.

The thickness of the first layer 13 is 1.0 to 4.0 mm.
Is preferable, and 1.5-3.0 mm is more preferable. When the first layer 13 has a thickness of 1.0 mm or more, the impact force can be efficiently dispersed and relaxed, and when the thickness of the first layer 13 is 4.0 mm or less, the workability is excellent and the price becomes advantageous, which is preferable.

In the first layer 13, a leveling agent, a defoaming agent, a color correction dye, a near infrared absorbing (reflecting) dye, an antistatic agent, a heat stabilizer, an antioxidant, a dispersant, a flame retardant, and a lubricant. ,
A plasticizer, an ultraviolet absorber or the like may be contained. Further, between the first layer 13 and the second layer 14,
It is also possible to interpose a layer containing a color tone correction dye, a near-infrared absorbing (reflecting) dye, an antistatic agent, an ultraviolet absorber and the like.

When a thermosetting resin such as urethane resin and silicone resin is used as the material for the first layer 13, dip coating or spray coating is used to form the first layer 13 having an appropriate thickness. Method, spinner coating method, bead coating method, wire bar coating method, blade coating method, roll coating method, curtain coating method, slit die coater method, gravure coater method, slit reverse coater method, microgravure method, comma coater method, etc. The coating method, extrusion molding method, calender roll molding method, batch molding method, etc. In order to improve the processability, the thermosetting resin can be diluted with an organic solvent such as toluene, MEK, ethyl acetate, methylene chloride, or alcohol before coating. First
As the layer 13 of the above, a film obtained by applying the above-mentioned thermosetting resin onto a suitable substrate is used, and the layer is directly applied to the visible side surface of the front glass 12 or the front glass 12 side of the second layer 14. You can also

[Second Layer] The second layer 14 is made of a transparent synthetic resin having a shear modulus of 1 × 10 ⁶ Pa or more and less than 1 × 10 ⁸ Pa, and in the present embodiment, the first layer 13 is used. It is directly laminated on the visible side of the. The second layer 14 is made of, for example, a polyurethane resin, a polyester resin such as polyethylene terephthalate, polyethylene naphthalate, or polybutylene terephthalate, diacetyl cellulose,
Cellulose ester resins such as triacetyl cellulose, propionyl cellulose, butyryl cellulose, nitrocellulose, polyamide resins, polycarbonate resins,
Polyarylate resin, polystyrene resin, ethylene-vinyl acetate copolymer resin, polypropylene, polyolefin resin such as polymethylpentene, acrylic resin, polyetherketone resin, polyetherimide resin and the like, particularly polyurethane having excellent impact resistance. Resins are preferred.

The thickness of the second layer 14 is 0.05 to 3.0.
mm is preferable, and 0.1-2.0 mm is more preferable. By setting the thickness of the second layer 14 in the above range, impact resistance can be improved and workability at the time of bonding is improved. The shear modulus of the second layer 14 is not less than 1 × 10 ⁶ Pa and less than 1 × 10 ⁸ Pa, preferably 3
By setting the range from × 10 ⁶ Pa to ⁶ × 10 ⁷ Pa, the first
It is possible to form an impact resistant film having sufficient impact resistance in a state of being laminated with the layer 13 of FIG. Further, by selecting the shear elastic modulus in the above range, the lamination with the first layer 13 becomes easy, and the workability at the time of forming the layer itself is also improved. When the first layer 13 is formed on one side of the second layer 14 as a base material, it is preferable to subject the surface of the second layer 14 to corona treatment or easy adhesion treatment. This second layer 14
Contains leveling agent, defoaming agent, color correction dye, near infrared absorption (reflection) dye, antistatic agent, heat stabilizer, antioxidant, dispersant, flame retardant, lubricant, plasticizer, or ultraviolet absorber It may have been done.

As a preferred example of this embodiment, the second layer 14 has a shear modulus of 1 × 10 ⁶ Pa or more and 1 × 10 ⁸ Pa.
A structure in which a low refractive index synthetic resin film is laminated on one surface of the synthetic resin film in the range of less than and a laminated film having both the original shock absorbing function and antireflection function of the second layer 14 can be mentioned. . In particular, an antireflection layer having a low refractive index layer made of a non-crystalline fluoropolymer on one side of a soft polyurethane resin is preferable, and specific examples thereof include Arc Top (trade name) manufactured by Asahi Glass Co., Ltd.

The impact resistant film 10 of this embodiment has a first layer 13 made of a soft resin having a shear modulus of 1 × 10 ³ Pa or more and less than 1 × 10 ⁴ Pa, and a shear modulus of 1 × 10.
^A second layer 14 made of a hard resin of ⁶ Pa or more and less than 1 × 10 ⁸ Pa is laminated, and the first layer 13 is bonded to the front glass 12 of the flat display panel body 11, the front glass 12 has a structure in which the soft first layer 13 is interposed between the first layer 13 and the second layer 14 made of hard resin, so that the second layer 14 is added to the front glass 12 side through the first layer 13. The impact is dispersed and absorbed and absorbed by the first layer 13, the transmission of the impact force to the front glass 12 can be prevented, and the impact resistant film 10 that is lightweight and thin and has excellent impact resistance can be provided.

[Flat Display Panel] The flat display panel 20 according to the present invention is, as shown in FIG. 2, a front glass 1 of a flat display panel body 11.
2, the impact resistant film 10 described above is joined. The impact-resistant film 10 may be directly laminated on the front glass 12 of the flat display panel body 11 as described above, but if the first layer 13 does not have sufficient adhesiveness, a transparent adhesive layer may be used. It can be provided and easily attached to the flat display panel body 11. When using a pressure-sensitive adhesive, a commercially available pressure-sensitive adhesive can be used, and specific examples of preferable pressure-sensitive adhesives include acrylic ester copolymer, polyvinyl chloride, epoxy resin, polyurethane, vinyl acetate copolymer, styrene. An adhesive such as an acrylic copolymer, polyester, polyamide, polyolefin, styrene-butadiene copolymer rubber, butyl rubber, or silicone resin can be used. Further, when laminating the pressure-sensitive adhesive layer, it is preferable from the viewpoint of workability that a release film such as PET coated with a silicone resin or a fluorine-based resin is attached to the pressure-sensitive adhesive surface. Additives having various functions such as an ultraviolet absorber, a color correction dye, a near infrared absorbing (reflection) dye, and an electromagnetic wave shielding agent may be added to this adhesive. As a method of bonding the impact resistant film 10 to the flat display panel body 11, a roll laminating method, a vacuum laminating method, an autoclave method, or the like can be used.

As the flat display panel body 11, in addition to PDP, plasma addressed liquid crystal (PALC) display panel, field emission display (FED) panel, liquid crystal (LC) display panel, electroluminescence (EL) display panel, cathode. It can be a flat display panel such as a tube display (CRT).

FIG. 3 is a view showing another embodiment of the impact resistant film according to the present invention. The impact resistant film of the present invention can be formed by laminating one or more layers having various functions on the visible side of the second layer 14 described above. Examples of these layers include an ultraviolet absorption layer, a color tone correction layer,
Examples thereof include a near infrared ray absorbing (reflecting) layer, an antifouling layer, an antireflection layer, an electromagnetic wave shielding layer, a hard coat layer, and a layer that imparts a scratch resistance function. As an example thereof, the impact-resistant film 30 shown in FIG. 3 is a near-infrared ray having a near-infrared ray absorbing function and a color tone correcting function on the visible side of the second layer 14 with an adhesive layer 15 interposed therebetween. The absorption layer 17 and the antireflection layer 18 are laminated in this order. In this example, the flat display panel main body 11 is P
This shows a preferable combination in the case of DP, and when applied to a flat display panel body other than PDP, or in any of the first layer 13 and the second layer 14, an electromagnetic wave shielding function and a near infrared ray absorbing function. In the case where a color tone correction function is provided and / or the like, one or both of the electromagnetic wave shielding layer 16 and the near infrared ray absorbing layer 17 may be omitted. The details of each layer mentioned in this example are described below.

[Electromagnetic wave shielding layer] The electromagnetic wave shielding layer 16 is P
The electromagnetic wave radiated from the DP main body is shielded so as not to affect other home appliances by the electromagnetic noise, and the electromagnetic wave shielding layer 16 for the PDP is made of a conductive metal mesh. A layer or a light-transmitting conductive layer formed of a conductive multilayer film in which a metal film having a thickness of 5 to 20 nm is stacked by a thin film formation technique such as a sputtering method or the metal film and an oxide are stacked in multiple layers can be used. . For the conductive layer made of a conductive metal mesh, various mesh materials conventionally known as electromagnetic wave shielding (shielding) meshes for PDP can be used. Regarding these mesh materials, for example, JP-A-11-212475, JP-A-2000-156182, and JP-A-2000-286.
It is also described in Japanese Patent No. 593.

As the metal layer used for the transparent conductive layer,
One or more metals selected from the group consisting of Au, Ag and Cu or a layer containing the metal as a main component is preferable, and particularly,
A metal layer containing Ag as a main component is preferable because it has low specific resistance and low absorption. Furthermore, the metal layer containing Ag as a main component is a metal layer containing Ag as a main component and containing at least one of Pd, Au, and Cu because it suppresses Ag diffusion and consequently improves moisture resistance. Is preferred. The content ratio of at least one of Pd, Au or Cu is preferably 0.3 to 10 atom% with respect to the total amount of Ag and the content of at least one of Pd, Au or Cu. If it is 0.3 atom% or more, the effect of stabilizing Ag can be obtained, and if it is 10 atom% or less, good film formation rate and visible light transmittance can be obtained while maintaining good moisture resistance. . Therefore, from the above viewpoint, the added amount is preferably 5.0 atomic% or less. Further, since the target cost remarkably increases as the amount of addition increases, it is in the range of about 0.5 to 2.0 atom% in consideration of the normally required moisture resistance. When the translucent conductive layer is formed as a single layer, the thickness of this metal layer is 5 to 20 nm, preferably 8 to
It is set to 15 nm. The method of forming this metal layer is not particularly limited, but it is preferable to directly form a thin metal film on one surface side of the transparent substrate by a sputtering method capable of forming a uniform film.

The conductive layer has a low sheet resistance value,
Since low reflectance and high visible light transmittance are obtained,
A multilayer conductive film in which an oxide layer and a metal layer are alternately laminated on an appropriate transparent substrate such as a transparent synthetic resin film, particularly, a total of (2n + 1) layers including an oxide layer, a metal layer, and an oxide layer. (N is an integer of 1 or more) A multilayered conductive film is preferably used. As the oxide layer, Bi, Zr, Al, T
Examples of the layer include an oxide of one or more metals selected from the group consisting of i, Sn, In, and Zn. It is preferably a layer containing, as a main component, an oxide of at least one metal selected from the group consisting of Ti, Sn, In and Zn. In particular, a layer containing ZnO as a main component because of low absorption and a refractive index of around ₂ , and a layer containing TiO ₂ as a main component because a layer having a large refractive index and a preferable color tone can be easily obtained with a small number of layers. preferable. The oxide layer may be composed of multiple thin oxide layers. For example, instead of the oxide layer containing ZnO as a main component, a layer containing SnO ₂ as a main component and a layer containing ZnO as a main component can be formed. The oxide layer containing ZnO as a main component is preferably an oxide layer containing ZnO containing at least one metal other than Zn. The one or more contained metals are present mainly in the oxide state in the oxide layer. 1
ZnO containing one or more metals includes Sn, Al,
Preferred is ZnO containing one or more metals selected from the group consisting of Cr, Ti, Si, B, Mg and Ga. The content ratio of the one or more metals is preferably 1 to 10 atom% with respect to the total amount of the metals and Zn, because the moisture resistance of the obtained conductive film is improved. If it is 1 atomic% or more, the internal stress of the ZnO film can be sufficiently reduced and good moisture resistance can be obtained. Further, when the content is 10 atomic% or less, the crystallinity of ZnO is maintained well and the compatibility with the metal layer is not deteriorated. Considering obtaining a ZnO film with stable and good reproducibility and low internal stress, and considering the crystallinity of ZnO, the metal content is 2 to 6
Atomic% is preferred. The geometrical film thickness (hereinafter, simply referred to as film thickness) of the oxide layer is 20 to 60 nm (particularly 30 to 50 nm) for the oxide layer closest to the transparent substrate and the oxide layer farthest from the transparent substrate, and other than that. Oxide layer 40-120
nm (particularly 40 to 100 nm) is preferable.
The total film thickness of the metal layers is, for example, 25 to 40 nm (especially 25 to 35 nm) and the target of resistance value is 1.5 Ω / □ when the target of resistance value of the obtained conductive layer is 2.5 Ω / □. In this case, the thickness is preferably 35 to 50 nm (particularly 35 to 45 nm). The total total film thickness of the oxide layer and the metal layer is, for example, 150 to 220 nm (particularly 160 to 200 nm) when the number of metal layers is 2, and 230 to when the number of metal layers is 3.
330 nm (especially 250 to 300 nm), the number of metal layers is 4
In the case of, 270 to 370 nm (especially 310 to 350 n
m) is preferred. Between the first metal layer and the second oxide layer, between the second metal layer and the third oxide layer, and between the third metal layer and the fourth oxide layer. In forming the oxide layer, another layer (hereinafter referred to as an oxidation barrier layer) for preventing the metal layer from being oxidized can be provided. As the oxidation barrier layer, for example, a metal layer, an oxide layer, or a nitride layer is used. Specifically, Al, T
One or more metals selected from the group consisting of i, Si, Ga and Zn, oxides and nitrides of the metals, and the like. Preferably, ZnO containing Ti or Si and Ga is used. The thickness of the oxidation barrier layer is preferably 1 to 7 nm. 1n
If it is thinner than m, the function as a barrier layer is not sufficiently exhibited.
When it is thicker than 7 nm, the transmittance of the film system is lowered.

An electrode (not shown) for connecting a ground wire for guiding a current generated in the layer due to an electromagnetic wave emitted from the PDP body to the ground wire is connected to the electromagnetic wave shielding layer 16. There is. The shape and dimensions of this electrode are not particularly limited, but a lower resistance is superior in terms of electromagnetic wave shielding performance. It is preferable that this electrode is provided on the entire periphery of the impact resistant film 30 in order to secure the electromagnetic wave shielding effect of the translucent conductive film. Such an electrode is, for example, Ag
Paste (paste containing Ag and glass frit) or C
An electrode obtained by applying and firing u paste (a paste containing Cu and glass frit) is preferably used. Furthermore, a long ground wire (not shown) connected to this electrode may be included.

[Near-infrared absorbing layer] Near-infrared absorbing layer 17
Is composed of a transparent synthetic resin layer containing a dye having a near-infrared absorbing ability to absorb near-infrared rays emitted from the PDP main body and a dye having a color tone correcting ability. As these dyes, both dyes and pigments can be used. In addition, "a dye having a near-infrared absorbing ability (hereinafter referred to as a near-infrared absorbing agent)" means at least a near-infrared region (wavelength 780 to 1).
Any dye capable of absorbing a part of the light of 300 nm) may be used, and a dye having an absorption ability also in other wavelength regions, for example, visible light may be used. In addition, "a dye having a color tone correcting ability (hereinafter referred to as a color tone correcting agent)" means
Light in the wavelength range of visible light (wavelength 380 to 780 nm)
A dye capable of specifically absorbing light in a specific wavelength region (a plurality of regions may be used) is preferable. The base synthetic resin containing the near-infrared absorbing agent and the color tone correcting agent is not particularly limited, various transparent thermoplastic synthetic resins or thermosetting synthetic resins can be used, and the thickness of the layer is not particularly limited. However, it is preferable that the thickness is about 0.5 to 25 μm.

As the near-infrared absorbing agent, polymethine type,
Phthalocyanine type, naphthalocyanine type, metal complex type,
Aminium-based, immonium-based, diimonium-based, anthraquinone-based, dithiol metal complex-based, naphthoquinone-based,
Examples thereof include, but are not limited to, indole phenol-based, azo-based, and triallylmethane-based compounds.
For heat ray absorption and noise prevention of electronic devices, a near infrared absorber having a maximum absorption wavelength of 750 to 1100 nm is preferable, and a metal complex type, an aminium type, a phthalocyanine type, a naphthalocyanine type, and a diimonium type are particularly preferable. The near-infrared absorber may be one kind or a mixture of two or more kinds.

The color tone correcting agent is used to absorb a part of a specific wavelength range of visible light and improve the color tone of transmitted visible light. As the color tone correcting agent that can be used in the present invention, azo type, condensed azo type, diimmonium type, phthalocyanine type, anthraquinone type, indigo type, perinone type, perylene type, dioxazine type, quinacridone type, methine type,
Well-known organic pigments and organic dyes such as isoindolinone-based, quinophthalone-based, pyrrole-based, thioindigo-based, metal complex-based, and inorganic pigments can be mentioned, but they have good weather resistance and are used as the main agent of the near-infrared absorbing layer 17. Dyes having good compatibility or dispersibility, such as diimmonium dyes, phthalocyanine dyes, and anthraquinone dyes, may be used alone or in combination of two or more.

When the impact resistant film 30 is applied to a PDP, the near infrared absorbing agent absorbs near infrared rays emitted from the display screen of the PDP,
It is possible to prevent noise generation in the electronic device.
Further, as a color tone correcting agent to be contained in the near infrared ray absorbing layer 17, an extra emission color (mainly 5%) from the discharge gas enclosed in the PDP body, for example, the binary gas of neon and xenon is used.
It is preferable to mix and contain one kind or plural kinds of color tone correcting agents for selectively absorbing / attenuating a wavelength region of 60 to 610 nm. With such a dye configuration, of the visible light emitted from the display screen of the PDP, extra light due to the emission of the discharge gas is absorbed and attenuated, and as a result, the visible light emitted from the display screen of the PDP is displayed. The color can be brought closer to the display color of the display target,
A PDP capable of displaying a natural color tone can be provided. As described above, some of the dyes that selectively absorb / attenuate the extra emission color from the discharge gas have an effect of absorbing / attenuating near infrared rays.

[Antireflection Layer] The antireflection layer 18 may be a layer having an antireflection property, and any known antireflection method can be adopted. For example, it may be a layer that has been subjected to antiglare treatment or a layer including a low refractive index layer.
From the viewpoint of preventing scattering of fragments when the highly rigid transparent substrate itself is damaged, it is preferable to have a low refractive index layer on one surface of the resin film. In particular, an antireflection layer having a low refractive index layer made of a non-crystalline fluoropolymer on one side of a soft polyurethane resin is preferable, and specific examples thereof include Arc Top (trade name) manufactured by Asahi Glass Co., Ltd. Further, a lubricant may be applied to the surface of the antireflection layer 18 serving as the outermost surface layer so as to impart wear resistance to the extent that the antireflection performance is not impaired, or a lubricant may be blended in the antireflection layer 18. Good. Examples of such a lubricant include perfluoropolyethers such as DuPont's trade name Krytox, Daikin Industries 'trade name Daifloyl, Ausimont's trade name Fomblin, and Asahi Glass' trade name Fronlube. To be

When an anti-scattering and anti-reflection resin film such as the above-mentioned Arctop (trade name) is used for the anti-reflection layer 18, a near-infrared absorber is mixed in the polyurethane resin layer, and this anti-reflection layer is used. 18 may have a near infrared ray shielding effect. Further, by containing a pigment and / or a dye that absorbs visible light of a specific wavelength, it is possible to provide a color tone correction capability for correcting the color balance of the display colors.

[Adhesive Layer] Between the second layer 14 and the electromagnetic wave shielding layer 16, the electromagnetic wave shielding layer 16 and the near infrared ray absorbing layer 17 are provided.
And the near-infrared absorbing layer 17 and the antireflection layer 18 can be bonded via the transparent adhesive layer 15. Suitable adhesives include ethylene-vinyl acetate copolymer (E
Examples thereof include hot melt type adhesives such as VA), epoxies, acrylate type ultraviolet ray curable type adhesives and thermosetting type adhesives. The thickness of each adhesive layer 15 is 0.1 to 1.0 m.
m, preferably 0.2 to 0.5 mm.

The impact-resistant film 30 of this embodiment is the first
State in which the soft first layer 13 is interposed between the front glass 12 and the second layer 14 made of hard resin in a state where the layer 13 is bonded to the front glass 12 of the flat display panel body 11. Therefore, the impact applied from the second layer 14 to the front glass 12 side through the first layer 13 is dispersed and absorbed by the first layer 13, and the impact force can be prevented from being transmitted to the front glass 12. In addition to being able to provide the impact resistant film 10 that is lightweight, thin, and has excellent impact resistance, the same effect as the impact resistant film 10 of the previous embodiment can be obtained.
The electromagnetic wave shielding layer 16 and the near-infrared absorbing layer 1 having both the near-infrared absorbing ability and the color tone correcting ability are provided on the visible side surface of the second layer 14.
By laminating 7 and the antireflection layer 18,
The flat display panel body 11 can be particularly suitably applied to a display panel such as a PDP in which noise due to electromagnetic waves or near infrared rays is generated and it is desirable to correct the color balance of display colors.

[0038]

EXAMPLES The effects of the impact resistant film of the present invention will be specifically described below. Examples 1 to 4 below are examples according to the present invention, and Examples 5 to 7 show comparative examples.

(Example 1) Fabrication of glass substrate: A transparent electrode, a bus electrode, a transparent dielectric and a protective film were sequentially laminated on a high strain point glass (trade name: PD200, manufactured by Asahi Glass Co., Ltd.) having a thickness of 2.8 mm. , Vertical 95
A glass substrate simulating the front glass of 0 mm × horizontal 540 mm PDP was produced. Each of these layers was produced under the following conditions. Transparent electrode: ITO was formed into a film by a sputtering method, and an electrode pattern was prepared by photolithography. Bus electrode: Three layers of Cr-Cu-Cr were formed by a sputtering method, and an electrode pattern was prepared by photolithography. Transparent dielectric: A low melting point glass in the form of paste was formed by solid printing. Protective film: An adhesive (seal) layer was formed on the surface of the transparent dielectric by screen printing, and then MgO was formed by vapor deposition.

A 1.0 mm thick film made of a silicone resin (trade name: αGEL, manufactured by Geltec Co.) having a shear modulus of 4.6 × 10 ³ Pa and a polyurethane resin made of a 0.2 mm thick fluororesin. Laminated film with anti-reflection layer (Product name: ARCTOP UR2
199, manufactured by Asahi Glass Co., Ltd.) was laminated at room temperature using a rubber roll to prepare an impact resistant film. The shear modulus calculated from the tensile modulus of the polyurethane film was 6.7 × 10 ⁶ Pa. This impact resistant film was placed on the glass substrate such that the surface on the side of the silicone layer was in contact with the glass substrate, and the antireflection layer side was pressed and laminated at room temperature with a rubber roll to laminate the glass substrate with the impact resistant film ( Hereinafter, this is referred to as an impact resistant glass substrate). Using this impact resistant glass substrate (Example 1), an impact test and a heat resistance test were carried out under the following conditions. The results are shown in Table 1.

[Evaluation Method] Shear Elastic Modulus G ': Rheometric Scientific
Using a dynamic viscoelasticity measuring device ARES manufactured by Tiffic,
It was measured directly under the conditions of a frequency of 1 Hz and a temperature of 25 ° C. However, for the shear elastic modulus of polycarbonate or the like, the tensile elastic modulus (E) is measured at a temperature of 25 ° C. using the above device, and the tensile elastic modulus is converted into the shear elastic modulus according to the conversion formula E = 3G ′. Obtained. Unless otherwise specified, the shear modulus was directly measured by the above method.

Impact test: IEC standard (Publicat)
Ion 65.1985), a spring impact hammer (MODEL F-22, German PTL).
Manufactured by the company), 0.2J, 0.35J, 0.50J,
The evaluation was performed with an impact force of 0.70J and 1.00J. When there was no crack, it was marked with O, and when it cracked, it was marked with X. A polyamide-processed weight (radius 10 mm, 250 g) specified in the Electrical Appliance and Material Control Law is about 20.4 cm.
The impact energy when dropped from the height of 0.5 is 0.5
Since it matches 0J, it is 0.50 in this impact test.
If the impact resistance is J or more, it can be determined that the impact resistance is practically sufficient. In the impact test, the impact-resistant glass substrate was replaced with an aluminum plate (thickness 10 mm × length 1
000 mm × width 600 mm), the four sides were fixed with a vise, and the sample was leaned against a concrete wall.

Heat resistance test: Put in an oven at 80 ° C.,
After 1000 hours, it was taken out and the appearance was observed.
When there is no change compared to before placing in the oven, ○, when the impact resistant film peeled from the glass substrate, or when the occurrence of bubbles or distortion of the surface state between the film and the glass substrate was marked as × .

(Example 2) An impact resistant glass substrate was prepared in the same manner as in Example 1 except that the thickness of the polyurethane film (second layer) of Example 1 was changed to 1.0 mm. The same test as 1 was performed. The results are shown in Table 1.

(Example 3) The film (first layer) made of the silicone resin of Example 1 had a shear modulus of 7.8 × 10 ^3.
An impact-resistant glass substrate was produced in the same manner as in Example 1 except that the film was changed to a film made of a Pa silicone resin (trade name: θ-7, manufactured by Geltec Co., Ltd.) and having a thickness of 3.0 mm. The same test as 1 was performed. The results are shown in Table 1.

(Example 4) Silicone resin solution (trade name: S
D4560, manufactured by Toray Dow Corning Silicone)
And 100 parts by mass of a curing agent for silicone resin (trade name: SRX212, manufactured by Toray Dow Corning Silicone Co., Ltd.) were mixed to prepare a silicone adhesive. This silicone pressure-sensitive adhesive was applied to both sides of the film made of the silicone resin used in Example 1 using a bar coater, dried at 100 ° C. for 10 minutes and annealed to obtain 0.015 mm silicone on both sides. A silicone resin film on which an adhesive was laminated was obtained. An impact resistant glass substrate was prepared in the same manner as in Example 1 except that the silicone resin film of Example 1 was changed to the silicone resin film, and the same test as in Example 1 was carried out. The results are shown in Table 1.

Example 5 An impact test was conducted only on a glass substrate to which no impact resistant film was joined. The results are shown in Table 1.

Example 6 A 2.0 mm-thick film made of polycarbonate (trade name: Lexan 8010, manufactured by Asahi Glass Co., Ltd.) has an acrylic adhesive (manufactured by Soken Chemical Co., Ltd., trade name: SK Dyne 1604N, 150 mass) on one side. And 2 parts by mass of Soken Chemical Co., Ltd., trade name: L-45)
Was laminated to a thickness of 0.015 mm and laminated at room temperature using a rubber roll so that the pressure-sensitive adhesive surface was in contact with the glass substrate to prepare a glass substrate with a shock absorbing film, the same as in Example 1. The test was carried out. The results are shown in Table 1.

Example 7 Polypropylene having a thickness of 0.8 mm
/ EVA / Polypropylene film (Product name: POVIC
An acrylic adhesive (manufactured by Soken Chemical Industry Co., Ltd., trade name: SK Dyne 1604N, 150 parts by mass and 2 parts by mass of Soken Chemical Industry Co., Ltd., trade name: L-45) were mixed on both surfaces of -T and Achilles Co., Ltd. Of a polyethylene terephthalate (trade name: Cosmo Shine A4300, manufactured by Toyobo Co., Ltd.) having a thickness of 0.188 mm and laminated on one surface thereof at room temperature using a rubber roll. polypropylene/
The shear elastic moduli of EVA / polypropylene film and polyethylene terephthalate film were calculated from the tensile elastic moduli of 6.9 × 10 ⁷ Pa and 2.0 × 10 ^{9 respectively.}
It was Pa. The impact absorbing film and the glass substrate are laminated at room temperature using a rubber roll so that the pressure-sensitive adhesive surface of the impact absorbing film contacts the glass substrate,
A glass substrate with a shock absorbing film was prepared, and the same test as in Example 1 was carried out. The results are shown in Table 1.

[0050]

[Table 1]

As can be seen from the results shown in Table 1, the impact resistant films of Examples 1 to 4 according to the present invention were bonded to a glass substrate made by imitating the front glass of a PDP to obtain an impact resistant glass substrate. All had impact resistance of 0.50 J or more, which can be judged to have sufficient impact resistance in practical use. On the other hand, the glass substrate of Example 5 to which no impact resistant film was bonded had an impact resistance lower than 0.2J. Further, the impact-resistant glass substrate of Example 6 in which a polycarbonate layer (corresponding to the second layer) having a thickness of 2.0 mm was bonded to this glass substrate via a thin adhesive layer, the impact-resistant glass substrate of less than 0.2 J It was sex. From this, it is understood that the impact resistance is not increased only by the second layer, although the thickness of the second layer is increased. Furthermore, the impact resistant glass substrate of Example 7 in which a laminate produced by imitating a conventional laminate is joined has an impact resistance lower than 0.2 J, and each impact resistant glass substrate of Examples 1 to 4 according to the present invention. The impact resistance was obviously inferior to that of. Furthermore, since the impact resistant glass substrate of Example 7 uses a thermoplastic resin as the first layer, it has insufficient heat resistance,
It was not preferable as an impact resistant film for PDP.

[0052]

INDUSTRIAL APPLICABILITY According to the present invention, by bonding to a front glass of a flat panel display panel, it is possible to prevent glass shattering due to impact, and to reduce weight and thickness, and to provide an impact resistant film for a flat panel display panel. A flat display panel can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part for explaining a configuration of a PDP.

FIG. 2 is a cross-sectional view showing an embodiment of an impact resistant film and a flat display panel according to the present invention.

FIG. 3 is a cross-sectional view showing another embodiment of the impact resistant film and the flat display panel according to the present invention.

[Explanation of symbols]

10, 30 Impact-resistant film (impact-resistant film for flat display panel) 11 Flat display panel body 12 Front glass 13 First layer 14 Second layer 15 Adhesive layer 16 Electromagnetic wave shielding layer 17 Near infrared absorbing layer 18 Reflection Prevention layer 20 Flat display panel

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H01J 29/87 H01J 29/87 (72) Inventor Shigemi Kumamoto 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Incorporated (72) Inventor Takeomi Miyako 10 Asahi Glass Co., Ltd., Ichihara City, Ichihara, Chiba Prefecture In-house (72) Hiroshi Wachi 10 No. 5 Goi Coast, Ichihara, Chiba Asahi Glass Co., Ltd. (72) Inventor, Ken Moriwaki Ichihara, Chiba Prefecture Goikaigan address 10 Asahi Glass Co., Ltd. in the F-term (reference) 4F100 AK01A AK01B AK17 AK51 AK52 AR00C BA02 CB00 GB48 JA20A JA20B JD08C JD10C JK07A JK07B JK09 JL13A JN01A JN01B JN06C YY00A YY00B 5C032 AA07 BB05 BB20 CC06 CD04 EE03 EF01 EF02 EF04 EF07 5C040 FA01 FA04 GB03 GB14 GH10 MA09 5G435 AA02 AA09 AA18 BB06 CC09 FF14 GG33 GG43 HH03 HH18 KK05 KK07

Claims (6)

[Claims] 1. An impact resistant film to be bonded to the front glass of a flat display panel body, which is made of a transparent synthetic resin having a shear modulus of 1 × 10 ³ Pa or more and less than 1 × 10 ⁴ Pa, and is a flat type. A first layer on the front glass side of the display panel and a transparent synthetic resin having a shear modulus of 1 × 10 ⁶ Pa or more and less than 1 × 10 ⁸ Pa, and a second layer on the viewing side of the first layer. A shock-resistant film for a flat display panel, which comprises a layer. 2. The impact resistant film for a flat display panel according to claim 1, wherein the second layer is laminated on a visible side surface of the first layer. 3. The impact resistant film for a flat display panel according to claim 1, wherein the first layer is made of an adhesive resin material that is directly bonded to the front glass of the flat display panel. 4. The thickness of the first layer is 1.0 mm to 4.
0 mm range, the thickness of the second layer is 0.05 m
The impact resistant film for a flat display panel according to claim 1, having a thickness of m to 3.0 mm. 5. On the visible side of the second layer, at least one layer selected from the group consisting of an electromagnetic wave shielding layer, a near infrared ray absorbing layer, and an antireflection layer, and an adhesive layer for adhering these layers together. The impact resistant film for a flat display panel according to claim 1, wherein the impact resistant film is laminated. 6. A flat type in which the impact resistant film for a flat type display panel according to any one of claims 1 to 5 is bonded to a front glass of a flat type display panel body directly or via a transparent adhesive layer. Display panel.