JP2005242227A - Optical member for plasma display and plasma display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost optical member for a plasma display that can prevent double reflection on the plasma display and make the plasma display low-profile, and the plasma display which is free from double reflection and made low-profile. <P>SOLUTION: The optical member 10 for the plasma display which has a film 16 having at least an electromagnetic wave shield function, a near-infrared-ray cutting function, and an antireflective function and an adhesion layer 17 formed one surface of the film 16 and also has a tensile strength of ≥100 N/25 mm width and an adhesion strength of ≥3.0 N/25 mm width. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical member for a plasma display and a plasma display.

  Image display on a plasma display panel (hereinafter also referred to as PDP) is performed, for example, as follows. When xenon or neon filled in the PDP is excited by discharge, a line spectrum from the ultraviolet region to the near-infrared region is generated, and when the ultraviolet ray hits the phosphor, the phosphor emits visible light for image display. Light is generated.

Thus, near infrared rays other than visible light are generated from the PDP, and this may cause malfunction of infrared remote controllers such as plasma display devices and video devices. In addition, electromagnetic waves generated along with the discharge also leak from the PDP. Furthermore, orange light emission may occur from neon filled in the PDP, and the color tone of the image may be out of order.
In addition, when external light is inserted into the front surface of the PDP, the contrast of the image is lowered by the reflected light, making it difficult to see the screen.

  For this reason, in a plasma display, an optical filter in which an electromagnetic wave shielding layer, a near-infrared cut layer, a color correction layer, and an antireflection layer are laminated on a substrate made of tempered glass is disposed on the front surface of the PDP, thereby Prevention of near-infrared leakage, near-infrared leakage, color tone correction, and reflection of outside light.

  Further, by arranging the optical filter with a gap in front of the PDP, it protects the front of the PDP made of tempered glass from being directly applied with an external impact and prevents the front of the PDP from being damaged. At the same time, the surface temperature of the front surface of the PDP may reach about 90 ° C. The front surface of the PDP is cooled by arranging this optical filter with a gap for air cooling in front of the PDP.

  By the way, the plasma display is required to be thin. However, in the above-described plasma display, a gap for protecting the front surface of the PDP is provided between the PDP and the optical filter. Not enough. In addition, the presence of this gap causes a problem that the external light is reflected twice between the optical filter and the front surface of the PDP, and the contour of the image is blurred. Furthermore, since the optical filter itself is manufactured by sequentially laminating films for forming each layer on tempered glass, the cost is high and the yield is poor.

In order to prevent double reflection, it has been proposed that an optical film composed of an electromagnetic wave shielding layer, an infrared absorption layer, and an antireflection layer is directly attached to the front surface of the PDP through an adhesive layer. However, simply attaching an optical film to the front surface of the PDP directly applies external impacts to the front surface of the PDP, so that the tempered glass on the front surface of the PDP is easily damaged. Moreover, if the optical film is damaged along with the damage of the tempered glass, the glass fragments may be scattered. Therefore, in practice, an optical filter having antireflection layers formed on both sides of the tempered glass is separately placed in front of the optical film with a gap for protecting the front surface of the PDP, so that the optical film is externally provided. It is necessary to prevent the glass fragments from being scattered even when the tempered glass on the front surface of the PDP is broken (see Patent Document 1).
JP 2000-156182 A

  Therefore, an object of the present invention is to prevent double reflection in a plasma display, to enable thinning of the plasma display, and to achieve a low-cost optical member for plasma display, and to be thin without double reflection. It is to provide a plasma display.

  That is, the optical member for plasma display of the present invention has a film having at least an electromagnetic wave shielding function, a near-infrared cut function, and an antireflection function, and an adhesive layer formed on one side of the film, and has a tensile strength, It is 100 N / 25 mm width or more, and the adhesive strength is 3.0 N / 25 mm width or more.

Here, it is preferable that the film has a base material, and the base material is a multilayer base material including two or more base materials.
Moreover, it is desirable that the pressure-sensitive adhesive layer has a plurality of pressure-sensitive adhesive layers and one or more pressure-sensitive adhesive layer base materials sandwiched between the pressure-sensitive adhesive layers.

The film preferably has a multilayer thin film layer formed of a plurality of transparent thin film layers and a metal thin film layer sandwiched between the transparent thin film layers.
The adhesive layer preferably has a color correction function.
Moreover, it is desirable that the film has a base material, and the base material has an ultraviolet cut function.

  Moreover, the plasma display of the present invention comprises a plasma display panel and the optical member for plasma display of the present invention bonded to the front surface of the plasma display panel.

  The optical member for plasma display of the present invention has excellent impact resistance because the tensile strength is 100 N / 25 mm width or more. Further, since the tensile strength is 100 N / 25 mm width or more and the adhesive strength is 3.0 N / 25 mm width or more, even if the tempered glass on the front surface of the PDP is broken, the optical member for plasma display is broken. Without damaging tempered glass fragments, it reduces the scattering and falling. This eliminates the need to place an optical filter in front of the film with a gap for protecting the front surface of the PDP, thus preventing double reflections in the plasma display and making the plasma display thinner. To.

Further, if the film has a base material and the base material is a multilayer base material composed of two or more layers, the tensile strength of the film is increased, and the impact resistance and the glass scattering prevention effect are further improved. be able to.
In addition, if the adhesive layer has a multilayer structure composed of two or more adhesive layers and one or more adhesive layer substrates sandwiched between them, the impact absorption in the adhesive layer increases, The impact resistance and the glass scattering prevention effect can be further improved.

Further, if the film has a multilayer thin film layer formed of two or more transparent thin film layers and one or more metal thin film layers sandwiched between them, the electromagnetic wave shielding function can be achieved only by the multilayer thin film layer. Moreover, a near-infrared cut function and an antireflection function can be provided, the layer structure of the film can be simplified, and the cost can be suppressed.
Further, if the adhesive layer has a color correction function, the color tone can be corrected without separately providing a color correction layer on the film.
Further, if the film has a base material and the base material has an ultraviolet cut function, ultraviolet rays leaking from the PDP can be cut without separately providing an ultraviolet cut layer on the film.

  Moreover, since the plasma display optical member of the present invention is obtained by bonding the optical member for plasma display of the present invention to the front surface of the plasma display panel, there is no double reflection, and the plasma display is thinned.

Hereinafter, the present invention will be described in detail.
[Example 1]
FIG. 1 is a cross-sectional view showing an example of an optical member for plasma display of the present invention. The optical member 10 for plasma display includes a base material 11, a hard coat layer 12 formed on the surface of the base material 11, an antireflection layer 13 formed on the hard coat layer 12, and an adhesive layer on the back surface of the base material 11. 14 is composed of an electromagnetic wave shielding layer 15 provided via 14 and an adhesive layer 17 for attaching the film 16 to the PDP.

(Base material)
The substrate 11 may be transparent in the visible wavelength region, and examples of the material thereof include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycyclohexanedimethylene terephthalate (PCT), polyethylene 2,6 naphthalate. (PEN), thermoplastic polyester resins such as polybutylene 2,6 naphthalate (PBN); polycarbonate (PC), polyarylate, polystyrene, polyetheretherketone, polypropylene, polyimide and the like.

  Among these, as the base material 11, PBT, PCT, PEN, PBN, PC, and polyarylate are preferable because they are excellent in impact resistance and glass scattering prevention effect. In addition, since the optical member for plasma display may be required to have low thermal conductivity and heat resistance, among these, it has low thermal conductivity, heat resistance, impact resistance, and excellent glass scattering prevention effect. PC is particularly preferred.

  The base material 11 may contain a known additive, for example, an ultraviolet absorber, a plasticizer, a lubricant, a colorant, an antioxidant, a flame retardant, and the like. In particular, in order to give the substrate 11 an ultraviolet cut function, it is preferable to include an ultraviolet absorber such as benzophenone, benzotriazole, UVA, or triazine or a light stabilizer (HALS).

  The base material 11 may be a multilayer base material in which two or more layers of the same type or different types of base materials are laminated by hot pressing, coextrusion or the like. By setting it as such a multilayer base material, compared with the case where the single layer base material of the same thickness is used, the tensile strength of the film 16 increases and an impact resistance and the scattering prevention effect of glass further improve. Moreover, the base material 11 can be simultaneously provided with heat resistance and impact resistance by sandwiching a base material having high impact resistance but poor heat resistance with a base material having high heat resistance. As a structure of a multilayer base material, PET (with an ultraviolet cut function) / PEN, PET (with an ultraviolet cut function) / PC / PET, etc. are mentioned, for example.

  The thickness of the substrate 11 is preferably in the range of 50 to 500 μm. If the thickness of the substrate 11 is less than 50 μm, the impact resistance of the film 16 and the effect of preventing the glass from scattering may be insufficient, and the heat conduction of the film 16 tends to increase. On the other hand, when the thickness of the base material 11 exceeds 500 μm, the flexibility is insufficient, so that the film 16 is not suitable for being wound with a roll.

(Hard coat layer)
The hard coat layer 12 is a layer that improves the hardness of the surface of the substrate 11 and prevents scratches caused by scratching.
As the hard coat layer 12, acrylic resins such as ultraviolet curable acrylic esters, acrylamides, methacrylic esters, methacrylamides, organic silicon resins, thermosetting polysiloxane resins, and the like are suitable. It is.

Further, in order to impart an antistatic function to the hard coat layer 12, an antistatic agent such as a metal, a metal oxide, an anionic activator, a cationic activator, an amphoteric activator, and a nonionic activator may be included.
The thickness of the hard coat layer 12 is preferably in the range of 3 to 20 μm from the viewpoint of transparency, coating accuracy, and handleability.

(Antireflection layer)
Examples of the antireflection layer 13 include a multilayer film made of a plurality of films made of materials having different refractive indexes. Such layers include metal oxides, metal fluorides, metal silicides, metal borides, metal carbides, metal nitrides, metal sulfides and other inorganic materials such as vacuum deposition, sputtering, ion plating, ion beam It can be obtained by a method of laminating in multiple layers by the assist method or the like, a method of laminating resins having different refractive indexes such as acrylic resin, fluororesin and the like.

(Electromagnetic wave shielding layer)
The electromagnetic wave shielding layer 15 is a film formed by coating a metal mesh 18 with a transparent resin 19.
Examples of the metal mesh 18 include a mesh obtained by corroding a copper foil, a mesh made of a copper-nickel material in which copper is covered with nickel, and the like.
The transparent resin 19 maintains the light transmittance by matching the refractive index of the mesh gap with the base material 11, the adhesive layer 14, and the adhesive layer 17. Examples of the transparent resin 19 include an acrylic resin and a polycarbonate resin.

Further, the transparent resin 19 contains a near-infrared absorber, and the electromagnetic shielding layer 15 is given a function as a near-infrared cut layer.
Near-infrared absorbers include nitroso compounds, their metal complexes, cyanine compounds, squarylium compounds, thiol nickel complex compounds, phthalocyanine compounds, naphthalocyanine compounds, triallylmethane compounds, imonium compounds, diimonium compounds Naphthoquinone compounds, anthraquinone compounds, amino compounds, aminium salt compounds, carbon black, indium tin oxide, antimony tin oxide, oxides of metals belonging to Group 4A, 5A or 6A, carbides, borides, etc. It is done. It is preferable to use two or more kinds of near-infrared absorbers so that the entire near-infrared ray (approximately 800 nm to 1100 nm) can be absorbed, and the amount thereof is, for example, 10% or less of transmittance at a wavelength of 800 nm or more. It is adjusted to become.
The thickness of the electromagnetic wave shielding layer 15 is usually in the range of 5 to 30 μm.

(Adhesive layer)
The adhesive layer 14 adheres the base material 11 and the electromagnetic wave shielding layer 15. Examples of the adhesive used for the adhesive layer 14 include acrylic, urethane, silicone, rubber, vinyl acetate, ethylene-vinyl acetate copolymer, polyvinyl butyral, phenol, epoxy, and petroleum rosin. These adhesives can be mentioned.

(Adhesive layer)
The adhesive layer 17 is for attaching the film 16 to the front surface of the PDP. Therefore, as the material of the pressure-sensitive adhesive layer 17, a pressure-sensitive adhesive or an adhesive that can hold the film 16 on the front surface of the PDP is used.
Examples of the adhesive or adhesive include acrylic, urethane, silicone, rubber, vinyl acetate, ethylene-vinyl acetate copolymer, polyvinyl butyral, phenol, epoxy, petroleum rosin, and adhesive. A gel material etc. are mentioned.

  Among these, as the pressure-sensitive adhesive layer 17, an acrylic pressure-sensitive adhesive, a silicon-based pressure-sensitive adhesive, and an ethylene-vinyl acetate copolymer are preferable because of high impact relaxation ability. Moreover, since heat resistance may be required for the optical member for plasma display, among these, acrylic adhesives and silicon adhesives are particularly preferable in that they are excellent in both impact mitigation ability and heat resistance.

  In order to correct the color tone of the PDP image, the adhesive layer 17 may contain a dye that absorbs a wavelength of 595 nm, which is a neon emission spectrum. The amount of the dye is adjusted so that, for example, the transmittance at a wavelength of 595 nm is 20% or less.

  The adhesive layer 17 may have a multilayer structure including a plurality of adhesive layers and an adhesive layer base material sandwiched between the adhesive layers. By adopting such a multilayer structure, the thickness increases, the impact absorbability of the adhesive layer 17 increases, and the front surface of the PDP can be sufficiently protected from external impacts. For example, the thickness of the pressure-sensitive adhesive layer 17 is usually in the range of 20 to 100 μm in the case of a single layer, but can be 30 to 300 μm in the case of a multilayer structure. Examples of the configuration of the pressure-sensitive adhesive layer 17 include pressure-sensitive adhesive layer (with a color tone correction function) / base material for pressure-sensitive adhesive layer / pressure-sensitive adhesive layer.

  Examples of the base material for the adhesive layer include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycyclohexanedimethylene terephthalate (PCT), polyethylene 2,6 naphthalate (PEN), polybutylene 2,6 phthalate (PBN) and the like. Thermoplastic polyester resin; polycarbonate (PC), polyarylate, etc. can be used.

(Optical member for plasma display)
The optical member 10 for plasma display that is directly attached to the front surface of the PDP is required to have impact resistance for protecting the tempered glass on the front surface of the PDP and to prevent scattering of glass fragments when the tempered glass is broken. Therefore, the plasma display optical member 10 needs to have a tensile strength of 100 N / 25 mm width or more and an adhesive strength of 3.0 N / 25 mm width or more as a whole.

The tensile strength of the optical member 10 for plasma display is preferably 200 N / 25 mm width or more, more preferably 300 N / 25 mm width or more, and further preferably 400 N / 25 mm width or more. Further, the adhesive strength of the optical member 10 for plasma display is preferably 4.0 N / 25 mm width or more, more preferably 5.0 N / 25 mm width or more, and further preferably 6.0 N / 25 mm width or more. . The higher the tensile strength and the adhesive strength of the plasma display optical member 10, the better, and there is no particular upper limit.
Here, the tensile strength and the adhesive strength of the optical member 10 for plasma display are numerical values measured based on JIS A 5759 (standard of anti-scattering film for window glass).

  The optical member for plasma display 10 is formed, for example, by sequentially forming a hard coat layer 12 and an antireflection layer 13 on the surface of the base material 11 to form an upper film, and separately, an adhesive layer 17 is provided on the back surface of the electromagnetic wave shielding layer 15. It can be manufactured by forming the lower film and bonding them together via the adhesive layer 14.

(Plasma display)
The plasma display of the present invention is obtained by bonding the plasma display optical member 10 to the front surface of the PDP and the adhesive layer 17 to the front surface side of the PDP.
In the PDP, for example, a back glass substrate and a front glass substrate on which a large number of linear electrodes are arranged at a predetermined interval are bonded together so that the electrodes are orthogonal to each other, and xenon or neon is formed between the two substrates. It has a structure filled with a mixed gas or the like. In this PDP, a discharge cell is formed at each position where the electrodes on the back side and the front side are orthogonal to each other, and ultraviolet rays generated by the discharge in the discharge cell are provided on the glass substrate on the back side or the front side. When hitting the phosphor, visible light is emitted from the phosphor.

[Example 2]
FIG. 2 is a cross-sectional view showing another example of the optical member for plasma display of the present invention. The optical member 20 for plasma display includes a base material 11, a hard coat layer 12 formed on the surface of the base material 11, and a film 22 composed of a multilayer thin film layer 21 formed on the hard coat layer 12, and It consists of an adhesive layer 17 for attaching the film 22 to the PDP.
About the base material 11, the hard-coat layer 12, and the adhesion layer 17, since it is the same as the thing of the example 1, the detailed description of these is abbreviate | omitted.

(Multilayer thin film layer)
The multilayer thin film layer 21 has a multilayer structure formed of a plurality of transparent thin film layers and a metal thin film layer sandwiched between the transparent thin film layers. It has a prevention function.

A transparent thin film layer is a layer which has transparency with respect to visible light, and is a layer which prevents the light ray reflection of the visible region in a metal thin film layer by the refractive index difference with a metal thin film layer.
As a material for forming the transparent thin film layer, a material having a high refractive index, specifically a material having a refractive index with respect to visible light of 1.6 or more, preferably 1.7 or more is used in order to reduce the thickness. Such materials include indium, titanium, zirconium, bismuth, tin, zinc, antimony, tantalum, cerium, neodymium, lanthanum, thorium, magnesium, gallium and other oxides, or mixtures of these oxides, zinc sulfide. Etc. These oxides or sulfides may be in a range that does not greatly change the optical characteristics even if the stoichiometric composition of the metal and oxygen or sulfur is different. However, when using sulfides, it is necessary to consider the influence of sulfur on the silver alloy. An organic compound can also be used if the refractive index is within the above range. In that case, metal fine particles or the like may be added to increase the refractive index.

Among these, indium oxide, a mixture of indium oxide and tin oxide (ITO), and a mixture containing indium oxide and cerium oxide as a main component (ICO) have high transparency and a high refractive index, and are sputtered by DC discharge. (DC sputtering) It is preferable because film formation is possible, the film formation rate is high, and the adhesion with the metal thin film layer is good. Further, by using an oxide semiconductor thin film having relatively high conductivity such as ITO, absorption of electromagnetic waves can be increased.
For forming the transparent thin film layer, conventionally known methods such as sputtering, ion plating, ion beam assist, vacuum deposition, and wet coating can be employed.

  The metal thin film layer is a thin film made of metal, and preferably has a refractive index of light having a wavelength of 550 nm of 0.2 or less and an extinction coefficient of 5.0 or less. If the refractive index of light having a wavelength of 550 nm is 0.2 or less, the transparency is higher, and if the extinction coefficient is 5.0 or less, high transparency can be ensured even in a multilayer structure. In addition, the metal atoms in the metal thin film layer preferably have a continuous structure rather than an island structure from the viewpoint of conductivity or the like.

  Examples of a material having such a refractive index and extinction coefficient include silver or an alloy containing silver. Silver is excellent in electroconductivity (electromagnetic wave shielding property), infrared reflectivity, and visible light transmittance when multilayered. Further, an alloy containing silver can improve the chemical stability and physical stability of silver, and can prevent deterioration and aggregation due to environmental pollutants, water, oxygen, alkali, halogen, sulfur, heat, light, and the like.

Examples of metals other than silver in silver alloys include gold, platinum, palladium, copper, indium, tin, bismuth and other precious metals that are stable to the environment, and metals such as rare earth that move near the silver interface and form a protective layer. preferable. Two or more kinds of these metals may be contained. Among these, substitutional elements that do not destroy the face-centered cubic lattice structure, which is a crystal structure of silver, and elements that move and precipitate at the interface after forming the metal thin film layer to form a protective film for the metal thin film layer are preferable.
The silver content in the silver-containing alloy is preferably 0.3% by mass or more and less than 30% by mass, which is in a range not largely different from the conductivity and optical characteristics of the silver thin film.
For the formation of the metal thin film layer, any conventionally known method such as sputtering, ion plating, vacuum deposition, or plating can be employed.

  The layer structure of the multilayer thin film layer 21 is transparent thin film layer / metal thin film layer / transparent thin film layer / metal thin film layer / transparent thin film layer / from the point that the electromagnetic wave shielding function, the near infrared ray cutting function and the antireflection function are sufficiently exhibited. 7 layers of metal thin film layer / transparent thin film layer, or transparent thin film layer / metal thin film layer / transparent thin film layer / metal thin film layer / transparent thin film layer / metal thin film layer / transparent thin film layer / metal thin film layer / transparent thin film layer 9 A layer structure is preferred. Further, by optimizing the layer configuration such as the material and the film thickness, it is possible to provide heat dissipation and heat shielding functions.

(Optical member for plasma display)
The optical member 20 for plasma display that is directly attached to the front surface of the PDP is required to have impact resistance for protecting the tempered glass on the front surface of the PDP, and to prevent scattering of glass fragments when the tempered glass is broken. Therefore, the plasma display optical member 20 needs to have a tensile strength of 100 N / 25 mm width or more and an adhesive strength of 3.0 N / 25 mm width or more as a whole.
The tensile strength of the plasma display optical member 20 is preferably 200 N / 25 mm width or more, more preferably 300 N / 25 mm width or more, and further preferably 400 N / 25 mm width or more. Moreover, the adhesive strength of the optical member 20 for plasma display is preferably 4.0 N / 25 mm width or more, more preferably 5.0 N / 25 mm width or more, and further preferably 6.0 N / 25 mm width or more. . The higher the tensile strength and the adhesive strength of the optical member 20 for plasma display, the better, and there is no particular upper limit.

Here, the tensile strength and adhesive strength of the plasma display optical member 20 can be measured in the same manner as the plasma display optical member 10 of the first embodiment.
The optical member 20 for plasma display can be manufactured, for example, by sequentially forming the hard coat layer 12 and the multilayer thin film layer 21 on the surface of the base material 11 and further forming the adhesive layer 17 on the back surface of the base material 11. .

(Plasma display)
The plasma display of the present invention is obtained by bonding the plasma display optical member 20 to the front surface of the PDP and the adhesive layer 17 to the front surface side of the PDP.
Examples of the PDP include the same as those in the first embodiment.

[Example 3]
FIG. 3 is a cross-sectional view showing another example of the optical member for plasma display of the present invention. The optical member 30 for plasma display includes a base material 11, a second base material 31 bonded to the base material 11 through an adhesive layer 14, a hard coat layer 12 formed on the surface of the base material 11, and a hard coat layer. 12, a film 32 composed of an antireflection layer 13 formed on the surface 12 and an electromagnetic wave shielding layer 15 provided on the back surface of the second base material 31 via an adhesive layer 14, and affixing the film 32 to the PDP It consists of the adhesive layer 17 for attaching.
Since the base material 11, the hard coat layer 12, the antireflection layer 13, the adhesive layer 14, the electromagnetic wave shielding layer 15, and the adhesive layer 17 are the same as those of the first embodiment, their detailed description is omitted. .

(Second base material)
The second substrate 31 may be transparent in the visible wavelength region, and the same material as the substrate 11 can be used as the material thereof.
Among these, as the 2nd base material 31, PBT, PCT, PEN, PBN, PC, and polyarylate are preferable at the point which is excellent in impact resistance and the scattering prevention effect of glass. In addition, since the optical member for plasma display may be required to have impact resistance, among these, PC is particularly preferable because of its low thermal conductivity, heat resistance, impact resistance, and excellent glass scattering prevention effect. preferable.

  The second base material 31 may contain a known additive such as an ultraviolet absorber, a plasticizer, a lubricant, a colorant, an antioxidant, a flame retardant, and the like. In particular, in order to give the second substrate 31 an ultraviolet cut function, it is preferable to include an ultraviolet absorber such as benzophenone, benzotriazole, UVA, or triazine or a light stabilizer (HALS).

  Further, the second base material 31 may be a multilayer base material in which two or more layers of the same type or different types of base materials are laminated by hot pressing, coextrusion or the like. By setting it as such a multilayer base material, compared with the case where the single layer base material of the same thickness is used, the tensile strength of the film 32 increases and an impact resistance and the scattering prevention effect of glass further improve. Further, by sandwiching a PC having high impact resistance but inferior heat resistance with a substrate having high heat resistance, the second substrate 31 can be simultaneously provided with heat resistance and impact resistance. As a structure of a multilayer base material, PET (with an ultraviolet cut function) / PEN, PET (with an ultraviolet cut function) / PC / PET, etc. are mentioned, for example.

  The thickness of the second base material 31 is preferably in the range of 50 to 500 μm as the total thickness with the base material 11. If the total thickness of these substrates is less than 50 μm, the strength, impact resistance, and glass scattering prevention effect of the film 32 may be insufficient, and the heat conduction of the film 32 tends to increase. On the other hand, when the total thickness of these base materials exceeds 500 μm, the flexibility is insufficient, so that the film 32 is not suitable for being wound with a roll.

(Optical member for plasma display)
The optical member 30 for plasma display directly attached to the front surface of the PDP is required to have impact resistance for protecting the tempered glass on the front surface of the PDP and to prevent scattering of glass fragments when the tempered glass is broken. Therefore, the plasma display optical member 30 needs to have a tensile strength of 100 N / 25 mm width or more and an adhesive strength of 3.0 N / 25 mm width or more as a whole.
The tensile strength of the plasma display optical member 30 is preferably 200 N / 25 mm width or more, more preferably 300 N / 25 mm width or more, and further preferably 400 N / 25 mm width or more. Moreover, the adhesive strength of the optical member 30 for plasma display is preferably 4.0 N / 25 mm width or more, more preferably 5.0 N / 25 mm width or more, and further preferably 6.0 N / 25 mm width or more. . The higher the tensile strength and the adhesive strength of the plasma display optical member 30, the better, and there is no particular upper limit.

Here, the tensile strength and adhesive strength of the plasma display optical member 30 can be measured in the same manner as the plasma display optical member 10 of the first embodiment.
The optical member 30 for plasma display is formed, for example, by sequentially forming a hard coat layer 12 and an antireflection layer 13 on the surface of the substrate 11 to form an upper film, and separately from this, an electromagnetic wave shield is formed on the back surface of the second substrate 31. It can be manufactured by attaching the layer 15 via the adhesive 14, forming the adhesive layer 17 on the back surface of the electromagnetic wave shielding layer 15 to form a lower film, and attaching them together via the adhesive layer 14.

(Plasma display)
In the plasma display of the present invention, the optical member 30 for plasma display is bonded to the front surface of the PDP, and the adhesive layer 17 is bonded to the front surface side of the PDP.
Examples of the PDP include the same as those in the first embodiment.

[Example 4]
FIG. 4 is a sectional view showing another example of the optical member for plasma display of the present invention. This optical member for plasma display 40 was formed on the base material 11, the hard coat layer 12 formed on the surface of the base material 11, the antireflection layer 13 formed on the hard coat layer 12, and the back surface of the base material 11. Infrared cut layer 41, second substrate 31 attached to infrared cut layer 41 via adhesive 14, and electromagnetic wave shielding layer 42 provided on the back surface of second substrate 31 via adhesive layer 14 And a pressure-sensitive adhesive layer 17 for attaching the film 43 to the PDP.
The base material 11, the hard coat layer 12, the antireflection layer 13, the adhesive layer 14, and the adhesive layer 17 are the same as those in the first embodiment, and the second base material 31 is the one in the third embodiment. Since these are the same, detailed description thereof will be omitted.

(Infrared cut layer)
The infrared cut layer 41 is formed, for example, by coating a transparent resin containing a near infrared absorber on the substrate 11.
Examples of the transparent resin include an acrylic resin and a polycarbonate resin.
As a near-infrared absorber, the same thing as what was used with the transparent resin 19 of the electromagnetic wave shield layer 15 of the form example 1 can be used.
The thickness of the infrared cut layer 41 is usually in the range of 5 to 30 μm.

(Electromagnetic wave shielding layer)
The electromagnetic wave shielding layer 42 is formed by coating the metal mesh 18 with a transparent resin 44 to form a film.
The transparent resin 44 is obtained by removing the near-infrared absorber from the transparent resin 19 of the first embodiment. The base resin is the same as the transparent resin 19.

(Optical member for plasma display)
The plasma display optical member 40 directly attached to the front surface of the PDP is required to have impact resistance for protecting the tempered glass on the front surface of the PDP, and to prevent scattering of glass fragments when the tempered glass is broken. Accordingly, the plasma display optical member 40 needs to have a tensile strength of 100 N / 25 mm width or more and an adhesive strength of 3.0 N / 25 mm width or more as a whole.
The tensile strength of the plasma display optical member 40 is preferably 200 N / 25 mm width or more, more preferably 300 N / 25 mm width or more, and further preferably 400 N / 25 mm width or more. The adhesive strength of the plasma display optical member 40 is preferably 4.0 N / 25 mm width or more, more preferably 5.0 N / 25 mm width or more, and still more preferably 6.0 N / 25 mm width or more. . The higher the tensile strength and the adhesive strength of the plasma display optical member 40, the better, and there is no particular upper limit.

Here, the tensile strength and adhesive strength of the plasma display optical member 40 can be measured in the same manner as the plasma display optical member 10 of the first embodiment.
The plasma display optical member 40 is formed, for example, by sequentially forming the hard coat layer 12 and the antireflection layer 13 on the surface of the base material 11 and forming the infrared cut layer 41 on the back surface of the base material 11 to form an upper film. Separately, the electromagnetic wave shielding layer 42 is attached to the back surface of the second base material 31 via the adhesive 14, and the adhesive layer 17 is formed on the back surface of the electromagnetic wave shielding layer 42 to form a lower film, and these are bonded. It can be manufactured by bonding through the layer 14.

(Plasma display)
The plasma display of the present invention is obtained by bonding the plasma display optical member 40 to the front surface of the PDP and the adhesive layer 17 to the front surface side of the PDP.
Examples of the PDP include the same as those in the first embodiment.

[Example 5]
FIG. 5 is a cross-sectional view showing another example of the optical member for plasma display of the present invention. The optical member for plasma display 50 includes a base material 11, a hard coat layer 12 formed on the surface of the base material 11, a multilayer thin film layer 21 formed on the hard coat layer 12, and an adhesive layer on the back surface of the base material 11. 14 includes a film 51 composed of an electromagnetic wave shielding layer 42 provided via 14 and an adhesive layer 17 for attaching the film 51 to a PDP.
About the base material 11, the hard-coat layer 12, and the adhesion layer 17, it is the same as the thing of the form example 1, About the multilayer thin film layer 21, it is the same as the thing of the form example 2, About the electromagnetic wave shielding layer 42 Since this is the same as that of the fourth embodiment, detailed description thereof will be omitted.

(Optical member for plasma display)
The optical member 50 for plasma display directly attached to the front surface of the PDP is required to have impact resistance for protecting the tempered glass on the front surface of the PDP and to prevent scattering of glass fragments when the tempered glass is broken. Therefore, the plasma display optical member 50 needs to have a tensile strength of 100 N / 25 mm width or more and an adhesive strength of 3.0 N / 25 mm width or more as a whole.
The tensile strength of the plasma display optical member 50 is preferably 200 N / 25 mm width or more, more preferably 300 N / 25 mm width or more, and further preferably 400 N / 25 mm width or more. The adhesive strength of the optical member 50 for plasma display is preferably 4.0 N / 25 mm width or more, more preferably 5.0 N / 25 mm width or more, and still more preferably 6.0 N / 25 mm width or more. . The higher the tensile strength and the adhesive strength of the plasma display optical member 50, the better, and there is no particular upper limit.

Here, the tensile strength and adhesive strength of the plasma display optical member 50 can be measured in the same manner as the plasma display optical member 10 of the first embodiment.
The optical member 50 for plasma display, for example, sequentially forms the hard coat layer 12 and the multilayer thin film layer 21 on the surface of the base material 11 to form an upper film, and separately, the adhesive layer 17 is formed on the back surface of the electromagnetic wave shielding layer 42. It can be manufactured by forming the lower film and bonding them together via the adhesive layer 14.

(Plasma display)
The plasma display of the present invention is obtained by bonding the plasma display optical member 50 on the front surface of the PDP and the adhesive layer 17 on the front surface side of the PDP.
Examples of the PDP include the same as those in the first embodiment.

[Example 6]
FIG. 6 is a cross-sectional view showing another example of the optical member for plasma display of the present invention. This optical member 60 for plasma display includes a base material 11, a second base material 31 bonded to the base material 11 via an adhesive layer 14, a hard coat layer 12 formed on the surface of the base material 11, a hard coat layer. 12, a film 61 composed of a multilayer thin film layer 21 formed on 12 and an electromagnetic wave shielding layer 42 provided on the back surface of the second base material 31 via an adhesive layer 14, and this film 61 is attached to a PDP It consists of the adhesive layer 17 for attaching.
About the base material 11, the hard-coat layer 12, and the adhesion layer 17, it is the same as the thing of the example 1, and about the multilayer thin film layer 21, it is the same as the thing of the example 2, and the 2nd base material Since 31 is the same as that of Embodiment 3, and the electromagnetic wave shielding layer 42 is the same as that of Embodiment 4, detailed description thereof will be omitted.

(Optical member for plasma display)
The optical member 60 for plasma display that is directly attached to the front surface of the PDP is required to have impact resistance for protecting the tempered glass on the front surface of the PDP, and to prevent scattering of glass fragments when the tempered glass is broken. Therefore, the plasma display optical member 60 needs to have a tensile strength of 100 N / 25 mm width or more and an adhesive strength of 3.0 N / 25 mm width or more as a whole.
The tensile strength of the plasma display optical member 60 is preferably 200 N / 25 mm width or more, more preferably 300 N / 25 mm width or more, and further preferably 400 N / 25 mm width or more. Moreover, the adhesive strength of the optical member 60 for plasma display is preferably 4.0 N / 25 mm width or more, more preferably 5.0 N / 25 mm width or more, and further preferably 6.0 N / 25 mm width or more. . The higher the tensile strength and the adhesive strength of the plasma display optical member 60, the better, and there is no particular upper limit.

Here, the tensile strength and adhesive strength of the plasma display optical member 60 can be measured in the same manner as the plasma display optical member 10 of the first embodiment.
The optical member 60 for plasma display, for example, sequentially forms the hard coat layer 12 and the multilayer thin film layer 21 on the surface of the base material 11 to form an upper film, and separately from this, an electromagnetic wave shield is formed on the back surface of the second base material 31. It can be manufactured by attaching the layer 42 via the adhesive 14, forming the adhesive layer 17 on the back surface of the electromagnetic wave shielding layer 42 to form a lower film, and attaching them together via the adhesive layer 14.

(Plasma display)
In the plasma display of the present invention, the plasma display optical member 60 is bonded to the front surface of the PDP and the adhesive layer 17 is bonded to the front surface side of the PDP.
Examples of the PDP include the same as those in the first embodiment.

[Other examples]
The optical member for plasma display according to the present invention is not limited to the above-described embodiments 1 to 6, and is formed on one side of this film with a film having at least an electromagnetic wave shielding function, a near infrared ray cutting function, and an antireflection function. As long as it has an adhesive layer, the tensile strength is 100 N / 25 mm width or more, and the adhesive strength is 3.0 N / 25 mm width or more, it may be in any form.

  For example, the base material may be provided with a near-infrared absorber or a dye that absorbs a wavelength of 595 nm to give a near-infrared cut function or a color tone correction function, or the near-infrared cut layer has a wavelength of 595 nm. It is also possible to provide a color tone correction function by including a dye that absorbs. Further, an antifouling layer may be provided. The antifouling layer is a layer having water repellency, oil repellency, and low friction, for example, silicon oxide, fluorine-containing silicon compound, fluoroalkylsilazane, fluoroalkylsilane, fluorine-containing silane compound, perfluoropolyether group-containing It is formed by coating the film surface with a silane coupling agent or the like.

(Heat dissipation layer)
In addition, the plasma display optical member may be required to suppress heat transmitted from the front surface of the PDP to the front surface of the film (surface not in contact with the PDP) as much as possible. Therefore, it is preferable that at least any one of the layers including the above-described base material has a heat dissipation function to serve as a heat dissipation layer. Alternatively, a heat dissipation layer may be provided independently of these layers.

The heat dissipating layer is a layer for dissipating heat transmitted from the front surface of the PDP. Specifically, the heat dissipating layer rapidly transmits heat to the inside of the layer and releases the heat from the periphery of the heat dissipating layer, so that the plasma display optical It is a layer that suppresses temperature rise near the surface of the member.
The heat dissipation efficiency in the heat dissipation layer depends on the thermal conductivity of the material of the layer and the film thickness of the layer. Therefore, it is preferable to use a resin having a high thermal conductivity and / or to include organic particles or inorganic particles having a high thermal conductivity in the layer serving as the heat dissipation layer. The film thickness is preferably thick because it is excellent in heat dissipation efficiency and impact resistance, but if it is too thick, it is not preferable in terms of transparency and handling.

(Heat shield layer)
In addition, the plasma display optical member may be required to suppress heat transmitted from the front surface of the PDP to the front surface of the film (surface not in contact with the PDP) as much as possible. Therefore, it is preferable that at least any one of the layers including the above-described base material has a heat shielding function to serve as a heat shielding layer. Alternatively, a heat shield layer may be provided independently of these layers.

The heat shielding layer is a layer that suppresses the temperature rise near the surface of the optical member for plasma display by shielding heat transmitted from the front surface of the PDP.
The shielding efficiency in the heat shielding layer depends on the thermal conductivity of the material of the layer and the film thickness of the layer. Therefore, it is preferable to use a resin having a low thermal conductivity and / or to include organic particles or inorganic particles having a low thermal conductivity in the layer serving as the heat shielding layer. Further, the layer may be composed of a material that reflects heat, or particles that reflect heat may be included. Further, the near infrared absorbing agent may be added. The film thickness is preferably thick because it is excellent in heat shielding efficiency and impact resistance, but if it is too thick, it is not preferable in terms of transparency and handling.

  By providing either one of the heat dissipation layer and the heat shield layer, it is possible to suppress the temperature rise near the surface of the optical member for plasma display, but this effect is further improved by combining these two layers. Can be made. Specifically, the heat dissipation layer is preferably provided between the heat shield layer and the adhesive layer, or the adhesive layer is preferably provided with a heat dissipation function. By setting it as such a structure, before heat | fever reaches | attains a thermal insulation layer, it is thermally radiated by the thermal radiation layer, and heat can be more reliably shielded by the thermal insulation layer.

  By attaching the plasma display optical member of the present invention to the front surface of the PDP, there is no need to separately arrange an optical filter with a gap in front of the PDP as in the prior art. An improved plasma display can be provided.

It is sectional drawing which shows an example of the optical member for plasma displays of this invention. It is sectional drawing which shows the other example of the optical member for plasma displays of this invention. It is sectional drawing which shows the other example of the optical member for plasma displays of this invention. It is sectional drawing which shows the other example of the optical member for plasma displays of this invention. It is sectional drawing which shows the other example of the optical member for plasma displays of this invention. It is sectional drawing which shows the other example of the optical member for plasma displays of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Plasma display optical member 11 Base material 16 Film 17 Adhesive layer 20 Plasma display optical member 21 Multilayer thin film layer 22 Film 30 Plasma display optical member 31 2nd base material 32 Film 40 Plasma display optical member 43 Film 50 Plasma Optical member for display 51 Film 60 Optical member for plasma display 61 Film

Claims (7)

A film having at least an electromagnetic wave shielding function, a near infrared ray cutting function, and an antireflection function;
Having an adhesive layer formed on one side of this film,
An optical member for plasma display having a tensile strength of 100 N / 25 mm width or more and an adhesive strength of 3.0 N / 25 mm width or more.   The optical member for plasma display according to claim 1, wherein the film has a base material, and the base material is a multilayer base material composed of two or more base materials.   3. The plasma display optical according to claim 1, wherein the adhesive layer has a multilayer structure comprising a plurality of adhesive layers and an adhesive layer base material sandwiched between the adhesive layers. Element.   4. The plasma according to claim 1, wherein the film has a multilayer thin film layer formed of a plurality of transparent thin film layers and a metal thin film layer sandwiched between the transparent thin film layers. Optical member for display.   The optical member for plasma display according to any one of claims 1 to 4, wherein the adhesive layer has a color correction function.   The optical member for a plasma display according to any one of claims 1 to 5, wherein the film has a base material, and the base material has an ultraviolet cut function. A plasma display panel;
A plasma display comprising: the plasma display optical member according to any one of claims 1 to 6 bonded to a front surface of a plasma display panel.

Images