JP2007101639A - Filter for image display device and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter for an image display device that can properly suppress external light reflection and properly guides image light from an image display device to the outside so as to display sharp images. <P>SOLUTION: The filter 10 for the image display device has a transparent base material 1, a netted metal layer and a blackened layer 3 provided on one side of the transparent base material 1, and a condenser lens 11 provided in an opening part 4 of the net-like metal layer 2 and blackened layer 3. The condenser lens 11 has a projection part 11a projecting from the blackened layer 3, and a blackened surface 11b is formed on a flank of the projection part 11a of the condenser lens 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a light-transmitting image display device filter and a manufacturing method thereof, and more particularly to an image display device filter having an optical filter function and particularly suitable for a display such as a PDP and a manufacturing method thereof.

  When observing an image display device such as a PDP (plasma display panel) or CRT (cathode ray tube) in a bright place, external light (external light such as fluorescent light or sunlight) is reflected on the screen, and the screen is whitened. There was a problem that the image contrast was lowered.

  To solve this problem, install a front filter in the form of a mesh (mesh, grid) with the observer side black (light collecting), and absorb the incident external light. It is known to improve image contrast (hereinafter also referred to as “light”) (see Patent Document 1 and Patent Document 2).

Image display devices using PDP, CRT, etc. also radiate unnecessary electromagnetic waves, and therefore need to be shielded. Therefore, the surface of a conductive metal mesh having electromagnetic wave shielding performance is subjected to blackening treatment, and the image display device filter (front filter) has both effects of preventing contrast reduction in bright places due to external light reflection and electromagnetic wave shielding. ) Is also known. (See Patent Document 3 and Patent Document 4).
Japanese Utility Model Publication No. 49-79123 Japanese Patent No. 2622762 Japanese Patent No. 2979021 JP 2002-9484 A

  In the conventional front filter as described above, a black mesh is used, which has external light absorption and image light absorption. For this reason, it is necessary to reduce the aperture ratio (increase the area ratio of the black portion) in order to enhance the external light reflection prevention (contrast improvement) performance. For example, in order to obtain sufficient antireflection performance in a bright room where sunlight enters from a window, the aperture ratio needs to be 70% or less. Therefore, when the aperture ratio of the black mesh is increased as described above, the image light transmitted through the mesh is reduced in the future, and the image is inevitably darkened. In order to increase the brightness of the screen, the aperture ratio needs to be 85% or more. As a result, there is no common part in the aperture ratio range satisfying both performances.

  As a result, it was impossible to achieve both the anti-light reflection performance (light contrast improvement effect) and the brightness of the image.

  The present invention has been made in consideration of such points, and a filter for an image display device capable of suppressing reflection of external light on a screen as much as possible and making image light to be observed clearer and its manufacture. It aims to provide a method.

  The present invention relates to a filter for an image display device arranged on the front side of an image display device, wherein a transparent base material and an opening having a predetermined aperture ratio are formed on the opposite side of the transparent base material from the image display device. And a light guide lens that is disposed in the opening of the blackening layer and guides image light from the image display device outward, and the light guide lens is outward from the opening of the blackening layer. The image display device filter is characterized in that a blackened surface is formed on a side surface of a portion of the light guide lens protruding from the blackened layer.

  According to the present invention, there is provided an image display wherein a mesh-like metal layer for electromagnetic wave shielding is provided on the side opposite to the image display device of the transparent substrate, and the blackening layer is formed on the surface of the mesh-like metal layer. This is a device filter.

  The present invention is the filter for an image display device, wherein each light guide lens is surrounded by an external resin.

  The present invention is a filter for an image display device, characterized in that a side section of a light guide lens is formed in a trapezoidal shape that tapers outward.

  The present invention is the image display device filter, wherein the light guide lens has a rectangular cross section.

  In the present invention, the blackened surface of the side surface of the light guide lens is made of an external resin containing a black pigment filled in the space between the light guide lenses on the blackened layer forming surface side of the transparent substrate. Is a filter for an image display device.

  The present invention relates to a method for manufacturing a filter for an image display device disposed on the front side of an image display device, and a step of preparing a transparent substrate, and an opening having a predetermined aperture ratio on one surface of the transparent substrate. A step of forming the formed blackening layer, a step of providing a photosensitive resin on one side of the transparent substrate, a step of exposing the photosensitive resin by applying light from the other side of the transparent substrate, and a photosensitive A step of forming a light guide lens protruding outward from the opening of the blackening layer by developing the photosensitive resin, and a step of providing a blackening surface on the side surface of the portion of the light guide lens protruding from the blackening layer And a manufacturing method of a filter for an image display device.

  The present invention provides an image display device characterized in that when a blackened surface is provided on a side surface of a light guide lens, a black ink layer is applied to the upper surface of the light guide lens, and then a black ink is applied. It is a manufacturing method of a filter.

  The present invention further includes a step of providing a mesh-like metal layer for electromagnetic wave shielding on one surface of the transparent substrate before forming the blackened layer, and the blackened layer is formed on the surface of the mesh-like metal layer. A method for manufacturing a filter for an image display device.

  The present invention is characterized in that, on the blackened layer forming surface side of the transparent substrate, an external resin surrounding each light guide lens is formed by filling a space between the light guide lenses with a transparent resin. This is a method for manufacturing a filter for an image display device.

  In the present invention, the step of providing the blackened surface on the side surface of the light guide lens includes filling the space between the light guide lenses with a resin containing a black pigment on the blackened layer forming surface side of the transparent substrate. It is a manufacturing method of the filter for image display apparatuses characterized by including.

  As described above, according to the present invention, external light that is incident mainly from the oblique direction by the blackened layer having the opening existing in the plane and the blackened surface of the side surface of the light guide lens protruding in the direction orthogonal thereto. Reflection can be appropriately suppressed, and image light from the image display device can be guided outward by a light guide lens to display a clearer image.

Hereinafter, typical embodiments of the present invention will be described with reference to the drawings.
1 to 8 are diagrams showing an embodiment of the present invention.

  First, the filter for an image display device according to the present invention (also referred to as an electromagnetic wave shielding filter when it also has an electromagnetic wave shielding mesh-like metal layer) will be described with reference to FIGS. The filter 10 for an image display device is disposed on the front side of various image display devices 20 such as a PDP and a CRT display.

  Such a filter 10 for an image display device is provided on the transparent substrate 1 and one surface of the transparent substrate 1 (a surface opposite to the image display device 20, also referred to as a surface), and has a predetermined aperture ratio ( The mesh-shaped metal layer 2 for electromagnetic wave shielding in which the opening 4 having about 45 to 93% is formed, and the blackening layer 3 formed on the surface of the metal layer 2 are provided.

  Among these, as shown to FIG. 6 (a) (b), the mesh-shaped metal layer 2 is provided through the adhesive agent 9 on the transparent base material 1, and etches metal foils, such as copper foil, as mentioned later Can be obtained. Further, the blackening layer 3 may be formed only on the surface of the metal layer 2 (FIG. 6A), and the blackening layer 3 may be formed on the side surface in addition to the surface of the metal layer 2 (FIG. 6). (B)).

  Further, since the blackened layer 3 is provided on the metal layer 2, the blackened layer 3 is provided with an opening 4 having an opening ratio similar to that of the metal layer 2 (about 45 to 93%). .

On one surface of the transparent substrate 1, a light guide lens 11 that guides the image light L ₁ from the image display device 20 outward is provided in the opening 4 of the metal layer 2 and the blackening layer 3. Yes. Further, an external resin 12 surrounding the light guide lens 11 is provided on one surface of the transparent substrate 1.

  As shown in FIG. 4, the light guide lens 11 is typically formed in a trapezoidal shape whose side cross-sectional shape is tapered outward (upward), and the light guide lens 11 is on the opening between the blackening layers 3. And projecting outward from the opening 4 to form a projecting portion 11a. Further, a blackened surface 11 b is formed on the side surface of the protruding portion 11 a of the light guide lens 11. There is no blackened surface at the tip (upper surface) of the protrusion. The total thickness of the light guide lens 11 is about 20 to 70 μm, and the thickness of the protruding portion 11a of the light guide lens is a value obtained by subtracting the total thickness of the blackened layer and all the layers laminated thereon from the total thickness. It becomes. Specifically, it is about 10 to 68 μm.

  The side cross-sectional shape of the light guide lens 11 may be a trapezoid whose slope is inclined with respect to the transparent substrate (see FIG. 4), and the slope is a rectangular shape upright from the transparent substrate. (See FIG. 5).

  Further, a toning layer 5, a transparent colored resin layer 6, and an antireflection layer 8 are sequentially provided on the surfaces of the mesh-like metal layer 2 and the blackening layer 3.

  In addition, you may provide the antirust layer 3a on the blackening layer 3. FIG.

  The metal mesh layer 2, the toning layer 5, the transparent colored resin layer 6, the antireflection layer 8, and the rust prevention layer described later are indispensable in the present invention. However, it is usually preferable to provide it from the viewpoint of improving the overall performance of the image display device.

  Next, each constituent material of the filter 10 for an image display device of the present invention will be further described.

[Transparent substrate 1]
The transparent substrate 1 is a layer for reinforcing a blackened layer having a low mechanical strength or a mesh layer. Therefore, as long as it has light transmittance as well as mechanical strength, it may be selected and used depending on the application, taking into account heat resistance, insulation, etc. as appropriate. Specific examples of the transparent substrate include a sheet made of resin or glass (or a film, the same applies hereinafter), a plate, and the like.

  Examples of transparent resins include polyethylene resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, terephthalic acid-isophthalic acid-ethylene glycol copolymer, terephthalic acid-cyclohexanedimethanol-ethylene glycol copolymer, nylon 6 Polyamide resins such as polypropylene, polyolefin resins such as polymethylpentene, acrylic resins such as polybutyl methacrylate and polymethyl methacrylate, styrene resins such as polystyrene and styrene-acrylonitrile copolymer, and cellulose such as triacetyl cellulose Resin, imide resin, polycarbonate resin and the like.

  In addition, these resins are used as a single or a plurality of types of mixed resins (including polymer alloys) as a resin material, and as a layer, they are used as a single layer or a laminate of two or more layers. In the case of a resin sheet, a uniaxially stretched or biaxially stretched sheet is more preferable in terms of mechanical strength.

  Moreover, you may add additives, such as a ultraviolet absorber, a filler, a plasticizer, an antistatic agent, in these resins suitably as needed.

  Examples of the glass include quartz glass, borosilicate glass, and soda lime glass. More preferably, the glass has a low coefficient of thermal expansion, excellent dimensional stability and workability in high-temperature heat treatment, and does not contain an alkali component in the glass. Examples include alkali-free glass.

  In addition, the thickness of the transparent base material 1 should just be according to a use, and there is no restriction | limiting in particular, When it consists of transparent resin, it is about 12-1000 micrometers normally, Preferably it is about 50-500 micrometers. On the other hand, when a transparent base material is a glass plate, about 1-5 mm is usually suitable. In any material, if the thickness is less than the above, the mechanical strength is insufficient, causing warping, sagging, breakage, etc. If the thickness exceeds the above, it becomes excessive performance and high cost, and thinning is difficult. .

  In addition, as the transparent substrate 1, a sheet (or film), a plate, or the like made of these inorganic materials, organic materials, or the like can be applied, and the transparent substrate is a display body composed of a front substrate, a back substrate, and the like. However, in the form used in combination with the electromagnetic wave shielding filter as a front filter disposed in front of the front substrate, the sheet is thinner than the plate in terms of thinness and lightness. Needless to say, the resin sheet is superior to the glass plate in that it is excellent and does not break.

  In addition, the transparent base material is preferably handled in the form of a continuous belt-like sheet at least at the initial stage of production, such as mesh layer formation, in that the electromagnetic shielding filter can be continuously produced and productivity can be improved. .

  In this respect, a resin sheet is a preferable material for the transparent substrate 1, but among the resin sheets, polyester resin sheets such as polyethylene terephthalate and polyethylene naphthalate, and cellulose resin sheets are particularly transparent. In view of heat resistance and cost, a polyethylene terephthalate sheet is more preferable. In addition, although the transparency of a transparent base material is so good that it is high, Preferably the light transmittance which becomes 80% or more by visible light transmittance | permeability is good.

  In addition, a transparent substrate such as a resin sheet is appropriately coated on the surface thereof with known easy processes such as corona discharge treatment, plasma treatment, ozone treatment, flame treatment, primer treatment, pre-heat treatment, dust removal treatment, vapor deposition treatment, and alkali treatment. An adhesion treatment may be performed.

[Mesh-like metal layer]
The mesh metal layer 2 has an opening 4 having a predetermined aperture ratio (about 45 to 93%) and is a layer that bears an electromagnetic wave shielding function. Moreover, even if it is opaque per se, the presence of the opening 4 in a mesh shape makes it possible to achieve both electromagnetic shielding performance and light transmission.

  The shape of the mesh of the metal layer 2 is not particularly limited, but the shape of the opening 4 is typically square. The shape of the opening 4 is, for example, a triangle such as a regular triangle, a square such as a square, a rectangle, a rhombus, or a trapezoid, a polygon such as a hexagon, or a circle or an ellipse. The mesh-like metal layer 2 has a plurality of openings 4 having these shapes, and the openings 4 are usually line-shaped line portions having a uniform width. Usually, the openings and the openings have the same shape on the entire surface. Size. For example, the aperture ratio is 75%.

  Note that the bias angle (the angle formed between the mesh line portion and the outer periphery of the electromagnetic wave shielding filter) may be appropriately set to an angle at which moire is difficult to occur in consideration of the pixel pitch of the display and the light emission characteristics.

  In general, the metal layer 2 is typically formed by etching a metal foil. Therefore, in this invention, the material and formation method of the metal layer 2 are not specifically limited, The various metal layers 2 in a conventionally well-known light-transmitting electromagnetic wave shield filter can be employ | adopted suitably. For example, a conductive layer is formed in a mesh shape on a transparent substrate from the beginning using a printing method, a plating method, or the like, or a conductive layer is formed on the entire surface from the beginning by a plating method. Things may be used.

  In the case where the mesh-like metal layer 2 is formed by etching, the metal layer 2 laminated on the transparent substrate 1 can be formed by patterning by etching and opening the openings to form a mesh. In order to laminate the metal layer 2 on the transparent substrate 1, the metal layer 2 prepared as a metal foil is laminated on the transparent substrate with the adhesive 9, or the metal layer 2 is deposited without using the laminating adhesive. Further, it can be laminated on the transparent substrate by using one or more physical or chemical forming techniques such as sputtering and plating. In addition, the metal layer 2 by etching can also be formed by patterning a single metal foil before lamination on a transparent substrate by etching to form a mesh. The mesh-shaped metal layer 2 alone is laminated on a transparent substrate with an adhesive or the like. Among these, a metal foil is laminated on the transparent substrate 1 with the adhesive 9 in terms of easy handling of the mesh-like metal layer 2 having low mechanical strength and excellent productivity, and then etching. The metal layer 2 which is processed into a mesh and is laminated on the transparent substrate via an adhesive is desirable.

  The metal layer 2 is not particularly limited as long as it has a conductivity sufficient to exhibit an electromagnetic wave shielding function, but the metal layer 2 can be formed by vapor deposition, plating, metal foil lamination, or the like as described above. . Examples of the metal material of the metal layer or the metal foil include gold, silver, copper, iron, nickel, and chromium. The metal of the metal layer may be an alloy, and the metal layer may be a single layer or multiple layers.

  In addition, the thickness of the metal layer 2 is about 1-100 micrometers, Preferably it is 5-20 micrometers. If the thickness is too thin, it will be difficult to obtain sufficient electromagnetic shielding performance due to an increase in electrical resistance, and if the thickness is too thick, it will be difficult to obtain a high-definition mesh shape. The side of the mesh disturbs the display angle of the display.

  Moreover, it is preferable that the surface of the metal layer 2 is a rough surface in order to improve adhesiveness with adjacent layers, such as the transparent adhesive 9. For example, in the case of copper foil, a rough surface is obtained on the surface (the surface of the blackened layer) simultaneously with the formation of the blackened layer by the blackening treatment. In addition, the grade of the rough surface is 10-point average roughness Rz [JIS-B0601 conformity (1994 version)], about 0.1-10 micrometers is good, More preferably, it is 0.5-1.5 micrometers. If the roughness is less than this, the effect of roughening cannot be sufficiently obtained, and if the roughness is larger than this, bubbles tend to be embraced during application of an adhesive, a resist or the like.

  A rust preventive layer 3 a may be provided on the blackened layer 3.

[Rust prevention layer 3a]
Since the metal layer 2 may rust and change during manufacturing, handling, etc., resulting in deterioration of electromagnetic shielding performance, if it is necessary to prevent rust, the surface of the metal layer 2 is covered with a rust prevention layer 3a. Good. Moreover, when the blackening layer 3 mentioned later tends to rust, it coat | covers also including the blackening layer 3. FIG. The coating may be performed on a surface selected in consideration of manufacturing cost or the like from one or more required surfaces among the front surface, back surface, and side surfaces of the conductor layer.

  The rust preventive layer 3a is not particularly limited as long as it is less likely to rust than the metal layer 2 to be formed, such as an inorganic material such as a metal, an organic material such as a resin, or a combination thereof. In some cases, the blackened layer 3 is also covered with a rust-preventing layer, so that the particles of the blackened layer 3 can be prevented from falling off and deformed, and the blackness of the blackened layer can be increased.

  As the rust prevention layer 3a, a conventionally known layer may be used as appropriate, for example, a metal or alloy such as chromium, zinc, nickel, tin, copper, or a metal oxide metal compound layer. These can be formed by a known plating method or the like. Here, if it shows an example of a rust prevention layer preferable at points, such as a rust prevention effect and adhesiveness, the chromium compound layer obtained by carrying out a chromate process after galvanization will be mentioned.

  In the chromate treatment, galvanization before the treatment is preferable in terms of adhesion and rust prevention effect. In addition, the rust preventive layer may contain a silicon compound such as a silane coupling agent in order to improve acid resistance during etching or acid cleaning.

  In addition, the thickness of a rust prevention layer is about 0.001-10 micrometers normally, Preferably it is 0.01-1 micrometer.

[Blackening layer 3]
The blackening layer 3 can improve the contrast of the image in the bright room of the display. Some of the blackened layers 3 have a roughened surface as described above and can improve adhesion. The blackening layer is preferably provided on all the surfaces and the side surfaces of the metal layer 2 that can be seen by the observer in terms of improving the contrast of the display image.

  In any case, the blackening layer 3 may be any layer that exhibits a dark color such as black, and may be any layer that satisfies basic physical properties such as adhesion, and the known blackening layer 3 is appropriately employed. obtain.

  Therefore, as the blackening layer 3, an inorganic material such as a metal, an organic material such as a black colored resin, or the like can be used. For example, as the inorganic material, a metal, an alloy, a metal oxide, a metal compound of a metal sulfide, or the like It is formed as a metal-based layer. As a method for forming the metal layer, various conventionally known blackening methods can be appropriately employed. Especially, the blackening process by a plating method is preferable at adhesiveness, uniformity, ease, etc. As a material for the plating method, for example, a metal such as copper, cobalt, nickel, zinc, molybdenum, tin, or chromium, a metal compound, or the like is used. These are superior to the case of cadmium or the like in terms of adhesion and blackness.

  In addition, when the metal layer 2 is copper, a preferable plating method as the blackening treatment for forming the blackened layer 3 includes a conductor layer made of copper in an electrolytic solution made of sulfuric acid, copper sulfate, cobalt sulfate, or the like. Then, there is a cathodic electrodeposition plating method in which a cationic particle is applied to attach cationic particles. According to this method, the rough surface can be obtained simultaneously with the black color by the adhesion of the cationic particles. Copper particles and copper alloy particles can be adopted as the cationic particles. The copper alloy particles are preferably copper-cobalt alloy particles, and the average particle size is preferably 0.1 to 1 μm. By the copper-cobalt alloy particles, the blackened layer 3 composed of a copper-cobalt alloy particle layer is obtained. The cathodic electrodeposition method is also preferable in that the average particle size of the cationic particles to be adhered is adjusted to 0.1 to 1 μm. When the average particle diameter exceeds the above range, the density of the adhered particles is reduced, blackness is reduced and unevenness occurs, and particle falling off (powder falling) is likely to occur. On the other hand, even if the average particle diameter is less than the above range, the blackness is lowered.

  Further, black chrome, black nickel, nickel alloy or the like is preferable as the blackening layer 3, and the nickel alloy is a nickel-zinc alloy, a nickel-tin alloy, or a nickel-tin-copper alloy. In particular, the nickel alloy has a good degree of blackness and conductivity, can also impart a rust prevention function to the blackened layer (becomes a blackened layer and a rustproof layer), and can omit the rustproof layer. In addition, since the particles of the blackened layer 3 are usually needle-shaped, the external appearance tends to change due to external force, but the nickel blackened layer 3 made of nickel alloy is difficult to deform and the appearance changes in the post-processing step. There are also advantages that are difficult to achieve. In addition, the formation method of a nickel alloy as a blackening layer may be a known electrolytic or electroless plating method, and the nickel alloy may be formed after nickel plating.

[Transparent adhesive 9]
The transparent adhesive 9 is used to bond and fix the metal layer 2 to the transparent substrate 1 and is also an unnecessary and omissible layer depending on the method for forming the mesh layer. The case where the transparent adhesive 9 is required is a case where the metal foil 2 is bonded and fixed to the transparent substrate with an adhesive. In this case, as an adhesive for adhering the metal foil to the transparent substrate 1, it is necessary to use a transparent adhesive so that the adhesive visible from the opening of the conductor layer does not impair the light transmittance.

  In addition, as a specific lamination | stacking method of the metal foil 2 and the transparent base material 1, it does not specifically limit and a well-known lamination | stacking method is employ | adopted suitably, Among these, a transparent base material is a typical resin sheet. In general, the dry lamination method is generally used.

  The transparent adhesive used for the transparent adhesive 9 is not particularly limited, and a known adhesive may be appropriately employed. For example, urethane adhesives, acrylic adhesives, epoxy adhesives, rubber adhesives and the like can be mentioned. Among them, urethane adhesives are preferable in terms of adhesive strength and the like. Such urethane adhesives include two-part curable urethane resin adhesives, and the two-part curable urethane resin-based adhesive includes various hydroxyl group-containing compounds and various polyisocyanate compounds. It is an adhesive using a liquid curable urethane resin.

  The transparent adhesive 9 is formed by applying a transparent adhesive to any one or both of a metal foil (before forming a mesh) or a transparent substrate by a known forming method, and then laminating them. It is formed by doing. Examples of the coating method include coating methods such as roll coating, comma coating, and gravure coating, and printing methods such as screen printing and gravure printing. In addition, although there is no restriction | limiting in particular in the thickness (at the time of drying) of a transparent adhesive bond layer, Although it is 0.1-20 micrometers in a hall, More preferably, it is 1-10 micrometers from points, such as adhesive force, cost, workability | operativity.

[Transparent colored resin layer 6]
The transparent colored resin layer 6 is a layer that also imparts an optical filter function to the electromagnetic wave shielding filter 10, and is a resin layer in which a pigment is contained in a matrix made of a transparent resin. The transparent colored resin layer can be formed by a known layer forming means such as coating with a resin composition containing a desired pigment in a binder made of a transparent resin or the like. The transparent colored resin layer is also preferably used as an adhesive layer for stacking and integration with functional layers such as other optical filters and optical articles.

  The term “coloring” as used herein means absorption at least at a part of the wavelength band extending from ultraviolet rays to visible rays and further to infrared rays. For example, if the pigment used absorbs light in the visible light region, it appears to be colored (including achromatic colors such as dark gray) literally, but it absorbs only ultraviolet light or light in the infrared region, and the light in the visible light region is completely absent. Alternatively, if it does not absorb substantially, it will not be colored and visible to the human eye, but such a case is also referred to as “coloring” in the present invention.

  As the dye, a dye corresponding to the purpose as an optical filter may be used. Therefore, for example, if the neon emission emitted from the PDP is suppressed and the color reproducibility is improved as the optical filter, a dye having a large light absorption around 590 nm of the neon emission spectrum may be used. In order to prevent malfunction of the infrared device, it is preferable to use a dye having absorption in the infrared or near infrared region. In addition, in order to prevent such a dye from absorbing in the visible light region and coloring it because it is not uniform in the visible light region and losing the white balance of the image, light absorption in the entire visible light region is prevented. In order to achieve neutral (achromatic color), it is preferable to use a dye having absorption in other portions in the visible light region.

  As such a dye, known dyes such as inorganic and organic can be used as appropriate, but those having a small increase in haze are preferable in terms of light transmittance. Dyes are preferred over pigments. However, some pigments have good light transmittance (light transmittance) and generally have better weather resistance than dyes.

  Specific examples of such dyes include, for example, infrared rays, and particularly dyes that absorb near infrared rays (near infrared absorbers, NIR absorbers) such as phthalocyanine dyes, naphthalocyanine dyes, and diimmonium salt dyes. And pigments.

  In addition, dyes that absorb neon light (neon light absorber, Ne light absorber), when applied to a PDP, block light at a wavelength of about 590 nm due to the neon light emission, adjust the hue of the image, and reproduce the color. Such a colorant can be used as long as it has a maximum absorption in the vicinity of the wavelength, and a representative one is a polymethine colorant (dye) (for example, Japanese Patent Application Laid-Open No. 2004-2005). -53799), cyanine dyes, xanthene dyes, azomethine dyes, porphine dyes, and the like.

  In addition, as a dye for light in the visible light region, various known dyes such as pigments and dyes, for example, azo dyes, phthalocyanine dyes, anthraquinone dyes, and the like may be used as appropriate.

  The transparent resin used for the transparent colored resin layer 6 is not particularly limited as long as it is a transparent resin, and a known resin may be appropriately adopted in consideration of adhesion to an adjacent layer such as a transparent blocking layer or a functional layer. good. For example, a thermoplastic resin, a thermosetting resin, an ionizing radiation curable resin, or the like. For example, thermoplastic resins are acrylic resins, polyester resins, thermoplastic urethane resins, vinyl acetate resins, etc., and thermosetting resins are urethane resins, epoxy resins, curable acrylic resins, etc. Examples of the radiation curable resin include acrylate resins that are cured by ultraviolet rays or electron beams.

  The transparent colored resin layer 6 is also preferably used by further laminating a functional layer such as an optical filter on the transparent colored resin layer and also serving as an adhesive layer for bonding and integrating the functional layers. By integrating the adhesive layer as an adhesive layer, advantages such as cost reduction, haze reduction, improved light transmission, lighter weight, and improved thickness can be obtained by reducing the constituent layers (no additional adhesive layer is required). . When the transparent colored resin layer is also used as an adhesive layer with the functional layer, as the resin for the transparent colored resin layer, a resin that serves as an adhesive can be used in addition to the resin as described above. Examples of the resin that becomes the pressure-sensitive adhesive include acrylic resins, silicone resins, rubber resins, and the like.

  If the transparent colored resin layer 6 is not formed as an adhesive layer with the functional layer, a known layer formation method for the coating method is formed on the surface of the transparent base material on which the mesh layer has been deposited. It can be formed by the method. In addition, if the transparent colored resin layer is laminated in a form that also serves as an adhesive layer with the functional layer, as a method other than this, on the surface of the functional layer prepared as a tangible material such as a sheet before lamination on the mesh layer. On the other hand, once formed by a known layer forming method such as a coating method, this transparent colored resin layer laminated functional layer is used on the transparent colored resin layer side using a pressure roll or the like on the mesh layer. Lamination and lamination may be integrated.

  Further, the thickness of the transparent colored resin layer 6 may be appropriately determined according to the amount of the dye added, the desired light absorption strength, the adhesion function as an adhesion layer by adhesion or adhesion, thickness uniformity, ease of production, etc. For example, it is about 0.1 to 30 μm. The thickness uniformity refers to color uniformity, and the thickness is an average thickness in the opening area of the mesh layer even if the surface of the transparent blocking layer is an uneven surface. May be uniform over the entire surface of the electromagnetic wave shielding filter, and the thickness of the opening and the non-opening in other portions may be non-uniform.

[Toning layer 5]
A toning layer 5 for adjusting the color of the electromagnetic wave shielding filter 10 is interposed between the mesh-like metal layer 2 and the transparent colored resin layer 6.

[Antireflection layer 8]
In addition, there are several methods for the antireflection layer (Anti Reflection layer, generally AR layer). For example, the low refractive index layer and the high refractive index layer are alternately laminated, and the outermost surface has a low refractive index. An example is a dielectric multilayer interference method using an index layer. It can be formed by a dry method such as vapor deposition or sputtering, or by using a wet method such as coating. Note that silicon oxide, magnesium fluoride, fluorine-containing resin, or the like is used for the low refractive index layer, and titanium oxide, zinc sulfide, zirconium oxide, niobium oxide, or the like is used for the high refractive index layer.

  As another method, a method using light diffusion at the surface of the surface with fine irregularities or a refractive index discontinuity in the layer (commonly known as anti-glare Anti Glare or AG layer), a resin binder such as silica It can be formed as a layer provided with fine irregularities that irregularly reflect external light on the surface of the layer by forming a coating film with an inorganic filler added or by shaping using a shaping sheet or shaping plate. As the resin of the resin binder, a curable acrylic resin, an ionizing radiation curable resin, or the like is preferably used because surface strength is desired as the surface layer.

  Next, the operation of the image light from the image display device 20 when the image display device filter 10 according to the present invention is disposed in front of the image display device 20 will be described.

As shown in FIG. 1, the image light L ₁ emitted from the image display device 20 is incident on the transparent substrate 1 side of the filter 10 for the image display device. The image light L ₁ incident on the transparent substrate 1 is then sent outward through the opening 4 formed between the blackening layers 3. When the light guide lens 11 has a shape that tapers outward as shown in FIG. 1 or FIG. 4 (see FIG. 4 in particular), the light guide lens 11 reaches the blackened surface on the side surface of the protruding portion 11a of the light guide lens. In order to prevent the captured image light from being absorbed by the blackened surface 11b, the refractive index of the material constituting the blackened surface (resin binder or the like) is selected to be lower than the refractive index of the material constituting the protruding portion 11a. It is preferable to do. In this way, the image light L ₁ is totally reflected by the interface between the protruding portion 11a and the blackening surface 11b of the light guide lens is condensed and guided to the full all outward. Thereafter, the image light L ₁ exits outward through the toning layer 5, the transparent colored resin layer 6 and the antireflection layer 8.

In this case, since the opening 4 formed in the mesh-like metal layer 2 and the blackening layer 3 has an aperture ratio of about 45 to 93%, 7 to 55% of the outside light L ₂ from the outside is , It is absorbed by the blackening layer 3 other than the opening 4 having an area of 7 to 55%. Of the outer L ₂ , 45 to 93% of light incident toward the opening that cannot be absorbed by the blackened layer 3 is blackened when the light is obliquely incident on the blackened layer. Most of the light is absorbed by the blackened surface 11b that rises vertically or obliquely outward from the layer 3. Incidentally external light L ₂ is mostly oblique incident component. Thus, a significant portion of the external light L ₂ is absorbed by either a blackening layer 3 and blackening surface 11b.

Possibly Therefore external light L ₂ is reflected light L ₃ is reflected to the transparent substrate 1 (see FIG. 7) decreases. As a result, the screen whitening (noise N) due to the reflected light L ₃ is reduced, and the image light L ₁ (signal S) emitted from the image display device 20 can be led out to the viewer side with almost no attenuation. Therefore, the S / N ratio of the image on the observation side is improved, and the image can be clearly seen from the outside even in a bright place.

Here, as in the comparative example shown in FIG. 7, when the light guide lens is not provided on the image display device 20 side of the transparent base material 1, a portion other than the opening 4 of the metal layer 2 and the blackening layer 3, that is, the entire portion. in 7-55% of the surface area, the reflection of 7-55% of Tamesoto light _{L 2} which absorbs external light _{L 2} can be prevented, the external light of the remaining 45-93% is the opening 4 And mixed with image light that also passes through the opening 4. However, when the aperture ratio is lowered, the external light reflectance is further reduced. On the other hand, most of the image light L ₁ is simultaneously shielded by the mesh-like metal layer 2 and the blackening layer 3 and is emitted outward. Can not. Eventually, the S / N ratio of the image does not improve.

On the other hand, according to the present invention, since the light guide lens 11 is provided on the transparent base material 1 and the side surface (only) thereof is the blackened surface 11b, the blackened layer provided on the surface of the metal layer 2 3 and the blackened surface 11 b of the light guide lens 11 can absorb more of the reflection of the outside L ₂ , and the image light L ₁ passing through the opening 4 from the image display device 20 can be absorbed by the light guide lens 11. Can be guided outward without being absorbed. For this reason, the attenuation of the image light (signal S) is suppressed as much as possible, and at the same time, the image whitening (noise N) due to the reflection of external light is attenuated, thereby improving the S / N ratio of the image and thereby clarifying the image contrast. it can.

  Next, a manufacturing method of the image display device filter 10 will be described with reference to FIGS.

  First, as shown to Fig.2 (a), while preparing the transparent base material 1, the metal foil 2 is provided in one surface (surface on the opposite side to an image display apparatus) of the transparent base material 1. FIG. Next, a resist 21 is applied on the metal foil 2, and a mask 22 is disposed on the resist 21 and exposed.

  Next, a developing solution is supplied to the resist 21 on the metal foil 2 provided on the transparent substrate 1 and developed to remove the resist 21 corresponding to the opening 4 (FIG. 2B). Thereafter, an etching solution is applied on the resist 21 to etch the metal foil 2 (FIG. 2C), and then the resist 21 is stripped (FIG. 2D).

  In this way, the mesh-like metal layer 2 having the opening 4 can be provided on the transparent base material 1, and then the blackening process is performed on the surface and side surfaces of the metal layer 2 to form the blackening layer 3. Can do.

  In addition, when providing the metal foil 2 on the transparent base material 1 as shown to Fig.2 (a), the blackening process may be performed to the metal foil 2 surface previously, and the blackening layer 3 may be provided. In this case, since the blackened layer 3 is provided in advance on the surface of the metal foil 2 and the metal foil 3 is etched in a later process, the blackened layer 3 remains only on the surface of the metal layer 2.

  Next, as shown in FIGS. 3A, 3 </ b> B, 3 </ b> C, and 3 </ b> D, a negative photosensitive resin 25 is applied to one surface of the transparent substrate 1, and the metal is applied from the other surface side of the transparent substrate 1. Exposure is performed by irradiating light with the layer 2 as an exposure mask (FIG. 3A).

  In this case, as the negative photosensitive resin 25, an acrylate monomer, a prepolymer, a cinnamic acid ester, an epoxy resin, or the like containing a benzotriazole photoinitiator can be used. On the other hand, after that, a developing solution is applied, and only the portion of the negative photosensitive resin 25 irradiated with light remains, and the other portion is removed (FIG. 3B).

  In this way, the photosensitive resin 25 having a trapezoidal side cross-sectional shape remains.

  At this time, a recess 25a is formed between the portions of the negative photosensitive resin 25 left by the development.

  Next, a black ink layer 28 (liquid repellent layer) that repels black ink is applied to the upper surface of the negative photosensitive resin 25 by a flexographic printing method or the like, and then a curtain flow coat or the like is applied to the side surface of the negative photosensitive resin 25. The black ink is coated by this coating method, and the blackened surface 11 b is formed on the side surface of the photosensitive resin 25. Next, a filling resin made of acrylic resin, urethane resin, epoxy resin, vinyl chloride-vinyl acetate copolymer or the like is filled in the recesses 25a between the negative photosensitive resins 25 to form the external resin 12 (wiping). .

  At this time, the light guide lens 11 is formed by the negative photosensitive resin 25 and the external resin 12 is formed by the filling resin. The light guide lens 11 has a height / width aspect ratio of approximately 2/1.

  Next, a toning layer 5, a transparent colored resin layer 6 and an antireflection layer 8 are sequentially provided on the mesh-like metal layer 2 side of the transparent base material 1 with a transparent adhesive 9, and the image display apparatus as shown in FIG. Filter 10 is produced.

In addition, it is not always necessary to provide the metal layer as the filter 10 for the image display device, and the light guide having the blackened surface 11b in the opening 4 while providing the blackened layer 3 having the opening 4 on the transparent substrate 1. The lens 11 is provided, and the image light L ₁ from the image display device 20 is guided outward by the light guide lens 11 from the opening 4 to be emitted, and is externally exposed by the blackening layer 3 and the blackened surface 11 b of the light guide lens 11. the reflection of light L ₂ may be prevented.

  As another form for forming the blackened surface 11 b of the light guide lens 11, a black pigment can be added to the external resin 12. As the black pigment, carbon black (black), aniline black, or the like is used.

The figure which shows the layer structure of the filter for image display apparatuses by this invention. The figure which shows the manufacturing method of the filter for image display apparatuses by this invention. The figure which shows the manufacturing method of the filter for image display apparatuses by this invention. The figure which shows the shape of the light guide lens of the filter for image display apparatuses by this invention. The figure which shows the shape of the light guide lens of the filter for image display apparatuses by this invention. The figure which shows the metal layer and blackening layer of the filter for image display apparatuses by this invention. The figure which shows the comparative example of the filter for image display apparatuses.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transparent base material 2 Mesh-like metal layer 3 Blackening layer 4 Opening part 10 Filter 11 for image display apparatuses Light guide lens 11a Projection part 11b Blackening surface 12 External resin 20 Image display apparatus 21 Resist 22 Mask 25 Negative photosensitive resin 25a recess

Claims (11)

In the image display device filter disposed on the front side of the image display device,
A transparent substrate;
A blackened layer provided on the opposite side of the image display device of the transparent substrate and having an opening having a predetermined aperture ratio;
A light guide lens that is disposed in the opening of the blackening layer and guides the image light from the image display device outward;
With
The light guide lens protrudes outward from the opening of the blackened layer, and a blackened surface is formed on a side surface of the portion of the light guide lens that protrudes from the blackened layer. filter.   2. The image according to claim 1, wherein a mesh-like metal layer for electromagnetic wave shielding is provided on the opposite side of the transparent substrate from the image display device, and the blackening layer is formed on the surface of the mesh-like metal layer. Filter for display device.   The image display device filter according to claim 1, wherein each light guide lens is surrounded by an external resin.   2. The filter for an image display device according to claim 1, wherein a side cross section of the light guide lens is formed in a trapezoidal shape that tapers outward.   2. The filter for an image display device according to claim 1, wherein a side cross section of the light guide lens is formed in a rectangular shape.   The blackened surface of the side surface of the light guide lens is made of an external resin containing a black pigment filled in the space between the light guide lenses on the blackened layer forming surface side of the transparent substrate. The filter for an image display device according to claim 1. In the manufacturing method of the filter for an image display device arranged on the front side of the image display device,
Preparing a transparent substrate;
Forming a blackened layer in which an opening having a predetermined opening ratio is formed on one surface of the transparent substrate;
Providing a photosensitive resin on one surface of the transparent substrate;
Exposing the photosensitive resin by applying light from the other surface side of the transparent substrate;
Developing a photosensitive resin to form a light guide lens protruding outward from the opening of the blackening layer; and
Providing a blackened surface on the side surface of the portion of the light guide lens protruding from the blackened layer;
A method for manufacturing a filter for an image display device.   8. The image display according to claim 7, wherein when the blackened surface is provided on the side surface of the light guide lens, a black ink is applied after a black ink layer that repels black ink is provided on the upper surface of the light guide lens. Manufacturing method of filter for apparatus. Before forming the blackening layer, further comprising the step of providing a mesh-like metal layer for electromagnetic wave shielding on one side of the transparent substrate,
8. The method for manufacturing a filter for an image display device according to claim 7, wherein the blackening layer is formed on the surface of the mesh-like metal layer.   8. The external resin surrounding each light guide lens is formed by filling a space between each light guide lens with a transparent resin on the blackened layer forming surface side of the transparent substrate. The manufacturing method of the filter for image display apparatuses of description.   The step of providing the blackened surface on the side surface of the light guide lens includes filling the space between the light guide lenses with a resin containing a black pigment on the blackened layer forming surface side of the transparent substrate. A method for manufacturing a filter for an image display device according to claim 7.

Images