JP2009133949A - Front filter for plasma display and plasma display using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a front filter for plasma display, which has preferable transparency, permits remarkable improvement of the contrast and is excellent in electromagnetic wave shielding property, and to provide a plasma display which is excellent in image quality and also can reduce a manufacturing cost. <P>SOLUTION: The front filter for plasma display is formed as a laminate provided with a transparent resin layer 3 on one side surface of a transparent film base material 2, the transparent resin layer 3 has a plurality of groove parts 4 on the surface 3a of the opposite side to the transparent film base material 2 such that the plurality of groove parts are disposed in parallel to one another, and black resin 5 and such conductive material 6 as to be located over the black resin 5 and fill the groove parts are arranged in the groove parts, wherein the black resin 5 is caused to exist so as to cover at least wall surfaces of the groove parts 4 by at least one half of the depth from the innermost part 4a of the groove parts 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a front filter for a plasma display, and more particularly to a front filter for preventing emission of electromagnetic waves from a plasma display panel and improving contrast, and a plasma display using the front filter.

In recent years, there has been an increasing demand for larger and thinner image display media, and the plasma display panel (PDP) is rapidly growing as a display medium that can cope with this demand. However, although a plasma display panel can provide high-luminance display characteristics, it has been suggested that the plasma display panel may emit strong electromagnetic waves and may cause damage to various instruments and the human body.
Further, since the plasma display panel uses an inert gas discharge of xenon or helium, it emits near infrared rays having a wavelength of 800 to 1000 nm. Such near infrared rays may cause malfunction of cordless telephones, infrared remote controllers, and the like. Further, there has been a problem that the color purity is lowered due to orange light emission (Ne light) of the Ne component contained in the inert gas.
Furthermore, the PDP has a problem that the contrast is insufficient and the image quality is deteriorated under a bright external condition, that is, in a bright room condition.

In order to solve such problems, there is a growing demand for front filters that can suppress the emission of electromagnetic waves, near infrared rays, and Ne light as described above, and can improve contrast in a bright room. A front filter having a multilayer structure composed of functional layers has been developed (Patent Document 1).
JP 2006-189867 A

However, the conventional front filter is a resin film having a layer for shielding electromagnetic waves, a layer for shielding near infrared rays, a layer for shielding Ne light, and a layer for shielding external light to improve contrast. Since the structure is laminated, the light transmittance is lowered, and the layer structure is complicated, so that there is a limit to the reduction in manufacturing cost.
The present invention has been made in view of such circumstances, and has a front filter for plasma display that has excellent transparency, excellent electromagnetic wave shielding properties, and excellent contrast improvement, and excellent image quality and manufacturing cost. An object is to provide a plasma display that can be reduced.

In order to achieve such an object, the front filter for plasma display of the present invention comprises a transparent film substrate, and a transparent resin layer provided on one surface of the transparent film substrate, the transparent resin layer comprising: A plurality of grooves are provided in parallel on the surface opposite to the transparent film substrate, the grooves are filled with a black resin and a conductive material located on the black resin, and the black resin is the innermost portion of the grooves. It was set as the structure arrange | positioned so that the wall surface of the said groove part might be coat | covered at least so that it might become 1/2 or more of depth from.
As another aspect of the present invention, a plurality of conductive stripes parallel to each other are disposed on the surface of the transparent resin layer so as to intersect the groove, and the conductive stripe is located in the groove. It was set as the structure which contacts a electrically conductive material.

The front filter for plasma display of the present invention comprises a transparent film substrate and a transparent resin layer provided on one surface of the transparent film substrate, and the transparent resin layer is opposite to the transparent film substrate. The groove portion is formed in a lattice shape on the surface, and the groove portion is filled with a black resin and a conductive material located on the black resin, and the black resin has a depth of 1 / depth from the innermost portion of the groove portion. It was set as the structure arrange | positioned so that the wall surface of the said groove part might be covered at least so that it might become two or more.
As another aspect of the present invention, the thickness of the transparent resin layer is in the range of 50 to 500 μm, the depth of the groove is 75 to 300 μm, the width is 10 to 80 μm, and the pitch is in the range of 50 to 300 μm. The configuration.
As another aspect of the present invention, the transparent film substrate surface on which the transparent resin layer is not formed has at least one of a near-infrared shielding layer, a Ne light shielding layer, and an ultraviolet absorption layer.
As another aspect of the present invention, the transparent film substrate surface on which the transparent resin layer is not formed has an antireflection layer so as to be the outermost layer.

The plasma display of the present invention includes a plasma display panel having a front plate and a back plate disposed in parallel and facing each other, and a number of cells formed between the front plate and the back plate, and the plasma display. And a front filter disposed on the front plate side of the panel. The front filter is a front filter for a plasma display according to any one of claims 1 to 6, wherein the transparent resin layer side of the front filter is plasma. It was set as the structure arrange | positioned so as to oppose the front plate of a display panel.
As another aspect of the present invention, another base material is interposed between the front plate and the front filter.
As another aspect of the present invention, the base material is configured to be a glass substrate provided with a space with the front plate.

In the present invention, the black resin located in the groove portion of the transparent resin layer constituting the front filter exhibits a function of effectively absorbing incident light from the outside and improving the contrast of the plasma display, and the conductive material located in the groove portion. The material exhibits an electromagnetic wave shielding function, and as a result, the layer for improving contrast and the electromagnetic wave shielding layer, which existed as individual layers in the conventional front filter, are combined into one transparent resin layer, and the layer structure is simple. Therefore, the light transmittance is high, and at the same time, the manufacturing cost can be reduced.
When the transparent film substrate has at least one of a near-infrared shielding layer, a Ne light shielding layer, and an ultraviolet absorption layer, the desired near-infrared shielding in addition to the above-described contrast improving function and electromagnetic wave shielding function. Function, Ne light shielding function, ultraviolet absorption function can be expressed, and the layer structure is simpler than the conventional front filter having the same function, so the light transmittance is high and at the same time the manufacturing cost Can be reduced.
Furthermore, when it has an antireflection layer on the surface of the transparent film base so as to be the outermost layer, it is possible to express an antireflection function and has a layer structure as compared with a conventional front filter having the same function. However, the light transmittance is high, and at the same time, the manufacturing cost can be reduced.

  In addition, the plasma display of the present invention suppresses the emission of electromagnetic waves and has high contrast under bright room conditions and excellent image quality. If the front filter to be used has at least one of a near-infrared shielding layer, a Ne light shielding layer, and an ultraviolet absorption layer, it is possible to further suppress near-infrared emission, Ne light emission, and ultraviolet exposure prevention. In addition, when the front filter used has an antireflection layer as the outermost layer, it is possible to suppress the influence of external light and display a high quality image.

Next, embodiments of the present invention will be described with reference to the drawings.
[Front filter]
(First embodiment)
FIG. 1 is a partial plan view showing an embodiment of the front filter of the present invention, and FIG. 2 is an enlarged cross-sectional view of the front filter of the present invention shown in FIG. 1 and 2, the front filter 1 includes a transparent film substrate 2 and a transparent resin layer 3 provided on one surface 2 a of the transparent film substrate 2. The transparent resin layer 3 constituting the front filter 1 includes a plurality of groove portions 4 in parallel on the surface 3 a opposite to the transparent film base 2. The groove 4 is filled with a black resin 5 and a conductive material 6, and the conductive material 6 is located on the black resin 5 and exposed on the surface 3 a of the transparent resin layer 3.

  FIG. 3 is a view for explaining the black resin 5 filled in the groove 4. In the present invention, the black resin 5 filled in the groove portion 4 is disposed so as to cover at least the wall surface of the groove portion 4 so as to be 1/2 or more of the depth from the innermost portion 4a of the groove portion 4. In FIG. 3A, the black resin 5 is densely filled from the deepest portion 4a of the groove portion 4 having a wedge-shaped cross section to a portion having a depth of ½ or more, and in the vicinity of the opening portion 4b of the groove portion 4 above it. The cross-section for filling the conductive material 6 leaves a space having a bowl shape. In FIG. 3 (B), the cross section for the black resin 5 to be densely filled from the deepest part 4a of the groove part 4 to a part that is ½ or more of the depth and to be filled with the conductive material 6 is shown. Leaves a square space. In FIG. 3C, the black resin 5 is disposed so as to cover the wall surface of the groove portion 4 from the innermost portion 4a to the opening portion 4b, and the groove portion 4 is filled with the conductive material 6. Leaving the space. Further, in FIG. 3D, the black resin 5 is disposed so as to cover the wall surface of the groove portion 4 from the innermost portion 4a to a portion having a depth of ½ or more of the depth. A space for filling the material 6 is left.

  The transparent film substrate 2 constituting the front filter 1 of the present invention needs to have appropriate transparency and heat resistance. For example, the transparency has a light transmittance of 80% or more at a wavelength of 400 nm. In addition, the heat resistance is preferably such that the glass transition temperature is 65 ° C. or higher. Specific examples of the transparent film substrate 2 to be used include, for example, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polymethyl methacrylate, polyolefin, cyclic polyolefin, norbornene, polyarylate, fluororesin (PTFE, CTFE, ETFE), transparent Examples include polyimide, polyamide, polypropylene, polyether sulfone, polyether ether ketone, polyether imide, polyphenyl sulfone, and triacetyl cellulose. The thickness of the transparent film substrate 2 is not particularly limited, but a film having a thickness in the range of about 50 to 300 μm, preferably about 75 to 200 μm is used from the viewpoint of mechanical strength.

  The transparent resin layer 3 constituting the front filter 1 of the present invention needs to have appropriate transparency and heat resistance. For example, the transparency has a light transmittance of 80% or more at a wavelength of 400 nm. In addition, the heat resistance is preferably such that the glass transition temperature is 90 ° C. or higher. Examples of such transparent resin layer 3 include polymethyl methacrylate resin, polyacrylate resin, polycarbonate resin, polyvinyl alcohol resin, polyvinyl pyrrolidone resin, hydroxyethyl cellulose resin, carboxymethyl cellulose resin, polyvinyl chloride resin, melamine resin, and phenol resin. Alkyd resin, epoxy resin, polyurethane resin, polyester resin, maleic acid resin, polyamide resin and the like, and can be appropriately selected in consideration of adhesion to the transparent film substrate 2 and the like. The thickness of the transparent resin layer 3 is not particularly limited, but may be set in the range of 50 to 500 μm, preferably about 75 to 200 μm from the viewpoint of effectively expressing the contrast improving function by the black resin formed in the groove 4. it can.

The cross-sectional shape of the groove 4 in which the transparent resin layer 3 is formed is a wedge shape in the above-described example, but is not limited to this, and for example, FIG. 4 (A), FIG. 4 (B), FIG. The cross-sectional shape as shown in C) can be obtained. The depth D of the groove 4 is 75 to 300 μm, preferably 100 to 150 μm, the width W1 is 10 to 80 μm, preferably 15 to 40 μm, and the pitch P1 is 50 to 300 μm, preferably 50 to 100 μm. It can be set appropriately. If the dimension of the groove portion 4 is out of the above range, the function of improving the contrast and the electromagnetic wave shielding function are insufficient, and the light transmittance of the front filter is not preferable.
The black resin 5 located in the groove portion 4 expresses a function of improving contrast. For example, polymethyl methacrylate resin, polyacrylate resin, polycarbonate resin, polyvinyl alcohol resin, epoxy resin, polyurethane resin, polyester resin, A material obtained by adding a black pigment such as carbon black or a dye to a resin material such as polyamide resin can be used. Further, as shown in FIGS. 3C and 3D, when the black resin 5 is disposed so as to cover the wall surface of the groove portion 4, the thickness of the black resin 5 is 0.1 μm. As described above, it can be set to be preferably 0.5 μm or more.

  The conductive material 6 located in the groove 4 and exposed on the surface of the transparent resin layer 3 exhibits an electromagnetic wave shielding function. For example, gold, silver, copper, aluminum, chromium, titanium, zinc, tin The conductive paste containing conductive fine particles such as nickel is filled in the groove portion 4 and then the resin component is removed to form the conductive paste. Alternatively, the conductive material 6 can be formed by filling the groove portion 4 with a conductive material such as gold, silver, copper, aluminum, or chromium by a vacuum film forming method or the like. Such a conductive material 6 has a thickness (maximum thickness) of 0.05 μm, preferably 0.1 μm or more. If the thickness of the conductive material 6 is less than 0.05 μm, sufficient conductivity cannot be obtained and the electromagnetic shielding performance is lowered, which is not preferable. The sheet resistance on the transparent resin layer 3 side of the front filter 1 is preferably in the range of 0.001 to 0.5Ω / □. Sheet resistance is measured by the 4-terminal method using Loresta manufactured by Mitsubishi Chemical Corporation.

  In such a front filter 1 of the present invention, the black resin 5 located in the groove 4 of the transparent resin layer 3 effectively absorbs incident light from the outside, and exhibits a function of improving the contrast of the plasma display. The conductive material 6 positioned in the groove portion 4 exhibits an electromagnetic wave shielding function, whereby the layer for improving contrast and the electromagnetic wave shielding layer, which existed as individual layers in the conventional front filter, are collected in the transparent resin layer 3. Therefore, the layer structure is simple, and therefore the light transmittance is high, and at the same time, the manufacturing cost can be reduced.

(Second Embodiment)
FIG. 5 is a partial plan view showing another embodiment of the front filter of the present invention, and FIG. 6 is an enlarged sectional view taken along line BB of the front filter of the present invention shown in FIG. 5 and 6, the front filter 11 includes a transparent film substrate 12 and a transparent resin layer 13 provided on one surface 12 a of the transparent film substrate 12. The transparent resin layer 13 constituting the front filter 11 includes a plurality of groove portions 14 in parallel on the surface 13a opposite to the transparent film substrate 12. The groove portion 14 is filled with a black resin 15 and a conductive material 16, and the conductive material 16 is located on the black resin 15 and exposed on the surface 13 a of the transparent resin layer 13. The black resin 15 filled in the groove portion 14 is disposed so as to cover at least the wall surface of the groove portion 14 so as to be 1/2 or more of the depth from the innermost portion 14a of the groove portion 14. Further, the front filter 11 is provided with a plurality of conductive stripes 17 (hatched in FIG. 5) parallel to each other on the surface 13 a of the transparent resin layer 13 so as to intersect the groove 14. The conductive stripe 17 is in contact with the conductive material 16 located in the groove portion 14.

Such a front filter 11 is the same as the front filter 1 of the first embodiment described above except that the conductive filter 17 is provided. Therefore, the transparent film substrate 12, the transparent resin layer 13, the groove portion 14, the black resin 15, and the conductive material 16 are the transparent film substrate 2, the transparent resin layer 3, the groove portion 4, the black resin 5, and the conductive material 6 of the front filter 1. The description here is omitted.
The conductive stripes 17 constituting the front filter 11 exhibit an electromagnetic wave shielding function in cooperation with the conductive material 16. Such a conductive stripe 17 is printed by a screen printing method using a conductive paste containing conductive fine particles such as gold, silver, copper, aluminum, chromium, titanium, zinc, tin, and nickel. It can be formed by removing the resin component. Alternatively, a conductive material such as gold, silver, copper, aluminum, or chromium can be formed on the transparent resin layer 13 through a mask pattern by a vacuum film forming method or the like to form the conductive stripe 17. The width W2 of the conductive stripe 17 can be appropriately set in the range of 10 to 80 μm, preferably 10 to 40 μm, and the pitch P2 is 50 to 300 μm, preferably 50 to 100 μm. If the size of the conductive stripe 17 is out of the above range, the electromagnetic wave shielding function is insufficient, or the light transmittance of the front filter is not preferable.

Moreover, the thickness T of the conductive stripe 17 can be set to a range of 0.2 to 30 μm, preferably 1 to 15 μm, when a conductive paste is used, and is formed by a vacuum film forming method. In the case, it can be in the range of 0.05 to 5 μm, preferably 0.1 to 2 μm. If the thickness of the conductive stripe 17 is less than the above-mentioned thickness, sufficient conductivity cannot be obtained and the electromagnetic shielding performance is deteriorated. If the thickness exceeds the above range, the conductive stripe 17 and the transparent resin layer 13 It is not preferable because the adhesiveness of the resin becomes low and peeling or the like may occur. The sheet resistance on the transparent resin layer 13 side of the front filter 11 is preferably in the range of 0.001 to 0.5Ω / □.
Furthermore, the angle at which the conductive stripes 17 and the groove portions 14 (conductive material 16) intersect can usually be 90 °, and can be set as appropriate within a range of 90 ° ± 45 °, for example.

  In such a front filter 11 of the present invention, the black resin 15 located in the groove 14 of the transparent resin layer 13 effectively absorbs incident light from the outside, and exhibits a function of improving the contrast of the plasma display, The conductive material 16 located in the groove 14 and the conductive stripe 17 located on the transparent resin layer 13 exhibit an electromagnetic wave shielding function, thereby improving the contrast existing as individual layers in the conventional front filter. And the electromagnetic wave shielding layer are integrated into one transparent resin layer 13 to make the layer structure simple. Therefore, the light transmittance is high, and at the same time, the manufacturing cost can be reduced.

(Third embodiment)
FIG. 7 is a partial plan view showing another embodiment of the front filter of the present invention, and FIG. 8A is an enlarged cross-sectional view of the front filter of the present invention shown in FIG. 8 (B) is an enlarged sectional view taken along line D-D of the front filter of the present invention shown in FIG. 7 and 8, the front filter 21 includes a transparent film base material 22 and a transparent resin layer 23 provided on one surface 22 a of the transparent film base material 22. The transparent resin layer 23 constituting the front filter 21 includes grooves 24 formed in a lattice shape on the surface 23 a opposite to the transparent film substrate 22. The groove 24 is filled with a black resin 25 and a conductive material 26, and the conductive material 26 is located on the black resin 25 and exposed on the surface 23 a of the transparent resin layer 23. Further, the black resin 25 filled in the groove portion 24 is disposed so as to cover at least the wall surface of the groove portion 24 so as to be 1/2 or more of the depth from the innermost portion 24 a of the groove portion 24.

Such a front filter 21 is the same as the front filter 1 of the first embodiment described above except that the grooves 24 are not in a stripe shape parallel to each other but in a lattice shape. Therefore, the transparent film substrate 22, the transparent resin layer 23, the groove 24, the black resin 25, and the conductive material 26 are the transparent film substrate 2, the transparent resin layer 3, the groove 4, the black resin 5, and the conductive material 6 of the front filter 1. The description here is omitted. The sheet resistance on the transparent resin layer 23 side of the front filter 21 is preferably in the range of 0.001 to 0.5Ω / □.
Such a front filter 21 of the present invention exhibits a function in which the black resin 25 located in the lattice-shaped grooves 24 of the transparent resin layer 23 effectively absorbs incident light from the outside and improves the contrast of the plasma display. At the same time, the conductive material 26 located in the groove 24 exhibits an electromagnetic wave shielding function, so that the layer for improving contrast and the electromagnetic wave shielding layer, which existed as individual layers in the conventional front filter, are transparent resin layer 23. Therefore, the layer structure is simple and the light transmittance is high. At the same time, the manufacturing cost can be reduced.

(Fourth embodiment)
FIG. 9 is a cross-sectional view corresponding to FIG. 2 showing another embodiment of the front filter of the present invention. In FIG. 9, the front filter 31 further includes a near-infrared / Ne-light shielding layer 33 and an ultraviolet absorption layer 34 on the surface 2 b of the transparent film substrate 2 of the above-described front filter 1 via an adhesive layer 32. It is prepared by stacking.
FIG. 10 is a cross-sectional view corresponding to FIG. 2 showing another embodiment of the front filter of the present invention. In FIG. 10, the front filter 31 ′ is obtained by disposing an antireflection layer 36 via an adhesive layer 35 on the ultraviolet absorbing layer 34 of the front filter 31.
The near-infrared / Ne-light shielding layer 33 and the ultraviolet absorbing layer 34 constituting the front filters 31 and 31 'are constituted by, for example, an ultraviolet absorbing film containing an ultraviolet absorber, and the ultraviolet absorbing film. It can be set as the laminated | multilayer film which formed the near-infrared and Ne light shielding layer 33 on it.

As the ultraviolet absorbing film containing the ultraviolet absorber in a dispersed manner, for example, a polyethylene terephthalate film, a polyethylene naphthalate film, a polyvinyl alcohol film or the like containing a conventionally known ultraviolet absorber can be used.
The near-infrared / Ne-light shielding layer 33 includes a near-infrared absorber having an absorption maximum in the near-infrared wavelength region and a Ne light-absorbing material having an absorption maximum in the wavelength region of 570 to 600 nm that is the emission spectrum band of Ne. Can be dispersed in a binder resin. The near-infrared absorbing material is a material having absorptivity to light in the wavelength range of 800 to 1100 nm, and examples thereof include an immonium compound, a diimmonium compound, a phthalocyanine compound, an aluminum salt compound, and a metal complex compound. Can do. Examples of the Ne light absorbing material include cyanine dyes, subphthalocyanine dyes, porphyrin dyes, and tetraazaporphyrin dyes. Further, the binder resin is not particularly limited as long as it has transparency and has high mechanical strength after curing. For example, an acrylic resin, an alkyd resin, a urethane resin, an epoxy resin, a silicon resin, Examples thereof include thermosetting resins such as fluorine resins and melamine resins, and photocurable resins.

  Such a near-infrared / Ne-light shielding layer 33 is formed by applying a resin composition containing a near-infrared absorbing material and a Ne light-absorbing material on an ultraviolet-absorbing film, and curing the near-infrared absorbing material and the Ne light-absorbing material. It can form by the method of laminating | stacking the sheet | seat formed using the resin composition to contain on a ultraviolet absorption film. The thickness of the near infrared / Ne light shielding layer 33 can be appropriately set within a range of 0.5 to 200 μm, preferably 2 to 30 μm. The near infrared / Ne light shielding layer 33 may be formed by laminating a near infrared shielding layer and a Ne light shielding layer individually.

  The antireflection layer 36 is a layer for preventing the visibility of the image from being deteriorated due to light reflection in the plasma display equipped with the front filter 31 ′ of the present invention. Such an antireflection layer 36 is preferably a layer having a light reflectance of 1 to 50% in a visible light region having a wavelength of 400 to 700 nm. As the antireflection layer 36, a conventionally known antireflection layer can be used. For example, the antireflection layer 36 can have a surface irregularity and can scatter external light. In addition, the antireflection layer 36 includes a layer having a high refractive index, a layer having a low refractive index, and a layer having an intermediate refractive index to cause interference of light, and among the optical properties of reflection, transmission, and absorption, reflection. A layer using a method for reducing the strength can also be used. Specifically, a low refractive index layer / high refractive index layer / low refractive index layer are laminated to form an antireflection layer 36, or a middle refractive index layer / high refractive index layer / low refractive index layer are laminated to prevent reflection. Layer 36 may be used.

Here, the high refractive index, medium refractive index, and low refractive index mean the relative high and low refractive indexes in the visible light region, and are usually defined by the refractive index at 550 nm. In addition, the high refractive index layer, the middle refractive index layer, and the low refractive index layer must be transparent. A chemical film or the like can be used. The metal element used for each of these layers is not limited to one type, and two or more types of metals and alloys thereof can be used, and examples thereof include an indium tin oxide film (ITO).
The type of the adhesive layer 32 is not particularly limited as long as it can fix the transparent film substrate 2 and the near infrared / Ne light shielding layer 33. The pressure-sensitive adhesive layer 35 is not particularly limited as long as it can fix the ultraviolet absorbing layer 34 and the antireflection layer 36. Specifically, as the adhesive layers 32 and 35, acrylic resin, polyester resin, polyvinyl alcohol, polyurethane resin, polyimide resin, epoxy resin, vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, and the like can be given. It is done.

  Such front filters 31 and 31 ′ of the present invention exhibit a function that the black resin 5 positioned in the groove 4 of the transparent resin layer 3 effectively absorbs incident light from the outside and improves the contrast of the plasma display. In addition, the conductive material 6 positioned in the groove 4 exhibits an electromagnetic wave shielding function, and thereby, a layer for improving contrast and an electromagnetic wave shielding layer, which existed as individual layers in the conventional front filter, are one transparent resin. The layer structure is integrated into a simple layer structure, and the near-infrared / Ne-light shielding layer 33 and the ultraviolet-absorbing layer 34 can exhibit a near-infrared shielding function, an Ne-light shielding function, and an ultraviolet-absorbing function. Since the layer structure is simpler than a conventional front filter having the same function, the light transmittance is high, and at the same time, the manufacturing cost can be reduced.

Further, the front filter 31 ′ having the antireflection layer 36 as the outermost layer can exhibit an antireflection function in addition to the above functions, and compared with a conventional front filter having the same function. Since the layer structure is simple, the light transmittance is high, and at the same time, the manufacturing cost can be reduced.
In the above example, the near-infrared / Ne-light shielding layer 33 and the ultraviolet absorbing layer 34 are further laminated on the surface 2 b of the transparent film substrate 2 of the front filter 1 via the adhesive layer 32. However, it is a matter of course that the front filters 11 and 21 described above may be used in place of the front filter 1.

(Production method)
Next, an example of a method for manufacturing a front filter according to the present invention will be described with reference to FIG.
First, a radiation curable resin composition for a transparent resin layer is applied on the transparent film substrate 2 to form a transparent resin coating film 3 '(FIG. 11A). Next, the mold 51 for groove formation is pressed against this transparent resin coating film 3 ', and in this state, the transparent resin coating film 3' is cured by irradiating radiation from the transparent film substrate 2 side (FIG. 11 ( B)) Then, the metal mold | die 51 is removed and the transparent resin layer 3 provided with the some groove part 4 in parallel is formed (FIG.11 (C)).
Next, a radiation curable black resin composition is applied onto the transparent resin layer 3, the excess black resin composition is scraped off with a doctor, the groove portion 4 is filled with the black resin composition, and then irradiated with radiation. To cure. Thereby, the black resin 5 is densely filled from the deepest portion 4a of the groove portion 4 having a wedge-shaped cross section to a portion that is 1/2 or more of the depth (FIG. 11D). This black resin 5 leaves a space having a bowl-shaped cross section for filling the conductive material 6 in the vicinity of the opening 4b of the groove 4 on it.

Next, a conductive paste is applied onto the transparent resin layer 3, and the excess conductive paste is scraped off with a doctor, and the space in the groove 4 is filled with the conductive paste, followed by baking treatment. By removing the organic component to form the conductive material 6, the front filter 1 of the present invention can be obtained (FIG. 11E).
In addition, by using a black resin composition having a high cure shrinkage, a black resin 5 as shown in FIG. 3B can be formed in which the space for filling the conductive material 6 is larger. Further, the black resin as shown in FIG. 3B can be obtained by controlling the amount of the black resin composition injected into the groove portion 4 instead of the method of scraping off the excess black resin composition with the doctor as described above. 5 can be formed.
Moreover, FIG. 12 is process drawing for demonstrating the other example of the manufacturing method of the front filter of this invention. This manufacturing method is the same as the manufacturing method described above up to the formation of the groove 4 (FIG. 11C).

Next, an appropriate amount of a black resin composition is injected into the groove 4 formed in the transparent resin layer 3 so that the black resin composition is attached only to the wall surface of the groove 4, and then cured by irradiation with radiation. Thereby, the black resin 5 is formed so as to cover the wall surface of the groove 4 from the innermost portion 4a to the opening 4b (see FIG. 3C) (FIG. 12A). The black resin 5 leaves a space for filling the conductive material 6 at the center of the groove 4. Next, a conductive paste is applied onto the transparent resin layer 3, and the excess conductive paste is scraped off with a doctor, and the space in the groove 4 is filled with the conductive paste, followed by baking treatment. By removing the organic component to obtain the conductive material 6, the front filter 1 of the present invention can be obtained (FIG. 12B).
By controlling the amount of the black resin composition injected into the groove portion 4, as shown in FIG. 3D, the black resin 5 is moved from the innermost portion 4a to the middle of the opening portion 4b (1/2 of the depth). Up to the above, it can be formed so as to cover the wall surface of the groove portion 4.

[Plasma display]
The plasma display according to the present invention includes the front filter of the present invention on the front plate of the plasma display panel. That is, if the front filters 1, 11, 21, 31, 31 'shown in the above embodiments are taken as an example, the transparent resin layers 3, 13, 23 constituting each front filter are connected to the front plate of the plasma display panel. It is fixed to.
FIG. 13 is a schematic configuration diagram showing an example of the plasma display of the present invention. The plasma display 71 has a front filter 31 ′ of the present invention fixed to the front plate side of the plasma display panel 72 through an adhesive layer 73. It is provided. A plasma display panel 72 used in the plasma display 71 of the present invention has a front plate and a back plate arranged in parallel and facing each other, and a large number of cells formed between the front plate and the back plate. Conventionally known AC type plasma display panels and DC type plasma display panels can be used. The adhesive layer 73 is not particularly limited as long as it can fix the plasma display panel 72 and the front filter 31 'and has high light transmittance.

In such a plasma display 71 of the present invention, the front filter 31 'suppresses the emission of electromagnetic waves and has high contrast under bright room conditions, and also suppresses near-infrared emission, Ne light emission, and ultraviolet light. Exposure can be prevented, and furthermore, high-quality image display can be achieved while suppressing the influence of external light.
Further, the plasma display of the present invention may be one in which another substrate is interposed between the front plate and the front filter of the plasma display panel. Such a base material may be, for example, a glass substrate provided with a space and a front plate of a plasma display panel, or a toning layer or the like.
In addition, the above-mentioned embodiment is an illustration and this invention is not limited to these embodiment.

Next, an Example is shown and this invention is demonstrated further in detail.
[Example 1]
A polyethylene terephthalate film (Lumirror T-60 manufactured by Toray Industries, Inc., thickness 188 μm) is prepared as a transparent film substrate, and an ultraviolet curable resin composition (manufactured by JSR Corporation) is formed on one surface of the transparent film substrate. Optomer) was applied with a die coater to form a transparent resin coating (thickness: 200 μm).
Next, the mold for groove formation is pressed against this transparent resin coating film, and in this state, the transparent resin coating film is irradiated with radiation from the transparent film substrate side to cure the transparent resin coating film. A transparent resin layer (thickness: 180 μm) having parallel grooves was formed. The groove forming mold used was formed by a continuous convex body having a wedge-shaped cross section (bottom 20 μm, height 105 μm) arranged on a flat plate in parallel with each other at a pitch of 75 μm. The groove portion reflected the shape of the wedge-shaped continuous convex body of this mold. That is, the groove portion had a cross-sectional wedge shape with a depth of 105 μm, a width of 20 μm, and a pitch of 75 μm.

Next, an ultraviolet curable black resin composition (black pigment dispersion optomer manufactured by JSR Co., Ltd.) is applied on the transparent resin layer with a die coater, and the excess black resin composition is scraped off with a doctor to blacken the groove. The resin composition was filled, and then cured by irradiation with ultraviolet rays. As a result, the black resin was densely filled from the deepest part of the groove portion having a wedge-shaped cross section to the vicinity of the opening, and a space having a cross-sectional shape with a depth of 5 μm was formed on the black resin in the groove portion. .
Next, while dropping silver paste (Nanodote from Fujikura Chemical Co., Ltd.) from the nozzle onto the transparent resin layer, scrape off the excess silver paste with a doctor and fill the above space in the groove with the silver paste. Thereafter, baking treatment (130 ° C., 30 minutes) was performed to remove the organic components of the silver paste by baking. Thereby, a conductive material was formed on the black resin, and the front filter of the present invention was obtained.

  The sheet resistance on the transparent resin layer side of the front filter thus obtained was measured by a 4-terminal method using a Loresta manufactured by Mitsubishi Chemical Corporation. As a result, it was 0.45Ω / □, and good electromagnetic shielding performance was obtained. It was confirmed to have. Moreover, as a result of measuring the light transmittance in wavelength 400nm using the spectrophotometer made from Shimadzu Corporation, it was 75%, and it was confirmed that it has favorable transparency.

[Example 2]
On the transparent resin layer of the front filter prepared in Example 1, a plurality of stripes were formed by screen printing so as to be orthogonal to the groove using the silver paste used in Example 1. Then, the baking process (120 degreeC, 30 minutes) was performed, and the organic component of the silver paste was baked and removed. As a result, a plurality of conductive stripes (thickness μm) parallel to each other with a line width of 30 μm and a pitch of 300 μm were formed, and the front filter of the present invention was obtained.
The sheet resistance on the transparent resin layer side of the front filter thus obtained was measured in the same manner as in Example 1. As a result, it was 0.08Ω / □, and it was confirmed that the sheet had good electromagnetic shielding performance. Moreover, as a result of measuring light transmittance similarly to Example 1, it is 72%, and it was confirmed that it has favorable transparency.

[Example 3]
Example 1 except that a continuous convex body having a wedge-shaped cross section (bottom side of 20 μm, height of 105 μm) is disposed in a lattice shape at a pitch of 140 μm on a flat plate is used as a groove forming die. The front filter of the present invention was produced in the same manner as described above.
The sheet resistance on the transparent resin layer side of the front filter thus obtained was measured in the same manner as in Example 1. As a result, it was 0.02Ω / □, and it was confirmed that the sheet had good electromagnetic wave shielding performance. Moreover, as a result of measuring light transmittance similarly to Example 1, it is 64%, and it was confirmed that it has favorable transparency.

  Useful in the manufacture of plasma displays.

It is a top view which shows one Embodiment of the front filter of this invention. It is an AA arrow expanded sectional view of the front filter shown by FIG. It is a figure for demonstrating the black resin which comprises the front filter of this invention. It is a figure for demonstrating the cross-sectional shape of the groove part which comprises the front filter of this invention. It is a fragmentary top view which shows other embodiment of the front filter of this invention. FIG. 6 is an enlarged cross-sectional view of the front filter shown in FIG. It is a fragmentary top view which shows other embodiment of the front filter of this invention. (A) is CC sectional view expanded sectional drawing of the front filter shown by FIG. 7, (B) is DD sectional view enlarged sectional view of the front filter shown by FIG. It is sectional drawing equivalent to FIG. 2 which shows other embodiment of the front filter of this invention. It is sectional drawing equivalent to FIG. 2 which shows other embodiment of the front filter of this invention. It is process drawing for demonstrating an example of the manufacturing method of the front filter of this invention. It is process drawing for demonstrating the other example of the manufacturing method of the front filter of this invention. It is a schematic block diagram which shows an example of the plasma display of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 11, 21, 31, 31 '... Front filter 2, 12, 22 ... Transparent film base material 3, 13, 23 ... Transparent resin layer 4, 14, 24 ... Groove part 4a, 14a, 24a ... Deepest part of a groove part 5, 15, 25 ... Black resin 6, 16, 26 ... Conductive material 17 ... Conductive stripe 33 ... Near infrared / Ne light shielding layer 34 ... Ultraviolet absorbing layer 36 ... Antireflection layer 71 ... Plasma display 72 ... Plasma display panel

Claims (9)

  A transparent film substrate and a transparent resin layer provided on one surface of the transparent film substrate, the transparent resin layer having a plurality of grooves in parallel on the surface opposite to the transparent film substrate, The groove portion is filled with a black resin and a conductive material located on the black resin, and the black resin covers at least the wall surface of the groove portion so as to be 1/2 or more of the depth from the innermost portion of the groove portion. A front filter for a plasma display, characterized by being arranged as described above.   A plurality of conductive stripes parallel to each other are disposed on the surface of the transparent resin layer so as to intersect the groove portions, and the conductive stripes are in contact with the conductive material located in the groove portions. The front filter for a plasma display according to claim 1.   A transparent film substrate and a transparent resin layer provided on one surface of the transparent film substrate, the transparent resin layer having grooves formed in a lattice shape on the surface opposite to the transparent film substrate The groove is filled with a black resin and a conductive material positioned on the black resin, and the black resin has at least the wall surface of the groove so as to be at least half of the depth from the innermost part of the groove. A front filter for a plasma display, wherein the front filter is disposed so as to cover.   The thickness of the transparent resin layer is in the range of 50 to 500 µm, the depth of the groove is 75 to 300 µm, the width is 10 to 80 µm, and the pitch is in the range of 50 to 300 µm. Item 4. The front filter for plasma display according to any one of Items 3 to 4.   5. The transparent film substrate surface on which the transparent resin layer is not formed has at least one of a near infrared shielding layer, a Ne light shielding layer, and an ultraviolet absorption layer. A front filter for a plasma display according to claim 1.   6. The front surface for a plasma display according to claim 1, further comprising an antireflection layer on the surface of the transparent film base on which the transparent resin layer is not formed so as to be an outermost layer. filter.   A plasma display panel having a front plate and a back plate disposed in parallel to each other, and a large number of cells formed between the front plate and the back plate, and disposed on the front plate side of the plasma display panel The front filter is a front filter for a plasma display according to any one of claims 1 to 6, wherein the transparent resin layer side of the front filter faces the front plate of the plasma display panel. A plasma display, characterized by being arranged to do so.   The plasma display according to claim 7, wherein another base material is interposed between the front plate and the front filter.   The plasma display according to claim 8, wherein the base material is a glass substrate provided with a space with the front plate.

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