JP2005242265A - Optical filter and filter for plasma display using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical filter for a display that suppress the intake of an air bubble at a frame print edge step part and balances designability and light shielding property of display part peripheral part frame print of a PDP optical filter at a high level. <P>SOLUTION: A frame print part is formed of a light shielding resin. A frame print layer can be formed which has sufficient light shielding property even when the film thickness is thin. The frame print part is provided with a protection layer to increase flaw resistance etc. Further, the frame print layer can have both thin film thickness and light shielding property even when colored not in black. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical filter suitably used for a display device such as a plasma display (PDP).

  With the advancement of information technology in recent social situations, the importance of display devices that play the role of man-machine interface is increasing. Among them, large-screen display devices used for televisions, personal computers, guidance displays such as stations and airports, and other various information provisions are required to have high image quality, high efficiency, and thinning.

  Currently, plasma display panels (hereinafter referred to as PDP) are attracting attention as next-generation large-screen flat panel displays, and some of them are already on the market. However, the PDP has a problem that a strong leakage electromagnetic field is generated due to a problem in principle. Leaked electromagnetic fields cause malfunctions of other electrical and electronic devices and communication failures, and recently there are concerns about the effects on the human body. In particular, the PDP device has a problem that near infrared light generated from excited atoms in the plasma acts on electronic devices such as cordless phones and remote controllers.

  For this reason, filters for shielding leakage electromagnetic fields and near-infrared light are generally used in display devices, particularly PDPs. The structure of a general electromagnetic wave shielding filter for display is such that an electromagnetic wave shielding layer is formed on one side of a support plate, and an antireflection layer is formed on the other side of the support plate and the film surface on which the electromagnetic wave shielding layer is formed. Can be mentioned. These members are used in combination as a PDP optical filter by bonding and coating.

  As an example of the electromagnetic shielding filter, there is an electromagnetic shielding plate prepared by applying and drying a conductive paste in a mesh shape on a transparent resin plate as described in JP-A-09-330667 (Patent Document 1). On the other hand, as an example of forming a transparent conductive thin film on a substrate, in Japanese Patent Application Laid-Open No. 10-073719 (Patent Document 2), a high refractive index transparent thin film layer (A) is formed on one main surface of a transparent polymer film. The metal thin film layer (B) was successively laminated four or more times with (A) / (B) as a repeating unit, and a high refractive index transparent thin film layer (A) and a transparent resin layer were further formed thereon. Examples thereof include an optical filter for display on which an optical film is bonded. When these electromagnetic wave shielding filters for displays are used, it is possible to efficiently shield electromagnetic waves generated from the PDP (housing) and near infrared rays. These electromagnetic wave shielding layers themselves are used by being laminated on a support plate such as a glass plate or a plastic plate because of insufficient mechanical strength.

  Also, regarding a frame printing unit located outside a PDP image display unit of a PDP (plasma display panel) optical filter, for example, in JP-A-09-049909 (Patent Document 3), There is an optical filter for display which can accurately and easily shield a portion that obstructs the visual field such as a PDP display peripheral connector portion by providing a light shielding portion printed in black. Furthermore, Japanese Patent Application Laid-Open No. 2002-352737 (Patent Document 4) discloses an example of an optical filter for display in which black frame printing is directly formed on the outer periphery of a plasma display panel.

In recent years, especially in the trend of lowering the price of PDP (plasma display panel) by overseas manufacturers, there is an increasing demand for a display filter with a differentiated design. Along with the color tone and contrast of the filter itself, there is a trend toward frame printing with high design and color design with sufficient light hiding.
JP 09-330667 A JP-A-10-073719 JP 09-049909 A JP 2002-352737 A

    In the conventional black ceramic frame printing, the film thickness of the frame printing is 15 to 20 μm. There is a defective product due to the entrapment of bubbles between the electromagnetic wave shielding film, antireflection film, near infrared ray shielding film, or visible light absorbing film laminated at a slight step between the printed part and the substrate generated by this frame printing. It has been found that there are problems that may occur and hinder yield improvement. Furthermore, the present inventors have also found a problem that it is extremely difficult to maintain a sufficient light-shielding property in color printing with a high design, especially with ceramic-based inks that have been used in the past. Furthermore, it has also been found that new problems such as printing streaks and unevenness do not disappear.

  The present invention has been made in view of the above-mentioned problems, and it is possible to balance the design of the frame printing at the peripheral portion of the display portion of the PDP optical filter and the light concealment at a high level. It is an object to provide an optical filter for display.

  As a result of repeated investigations, the present inventors have found that a frame printing portion containing a resin having a light concealing property is extremely effective for this problem. That is, it was found that the frame printing part can maintain a sufficient light-shielding property even when the film thickness is thin, and further, it is possible to form a clean printing layer that does not generate printing stripes and unevenness. In addition, since the printed film thickness can be reduced, it has been found that air bubble entrainment can be suppressed at the frame printing wrinkle step. It turned out that it can also be set as the frame printing part applicable to another kind of color.

  When resin ink having light shielding properties is used, scratch resistance and the like may be insufficient, but this has been found to be overcome by laminating a protective layer on the frame printing portion. Invented.

That is, the present invention
The present invention relates to an optical filter for a plasma display having a frame printing portion containing a light concealing resin. The optical filter for display according to the present invention is less likely to be defective and has an excellent surface shape of the frame printing portion.

  The present invention also relates to an optical filter for plasma display, wherein the frame printing section preferably has a laminated structure including a protective layer. The optical filter for display of the present invention is excellent in surface scratch resistance.

  The present invention also relates to an optical filter for plasma display, wherein the protective layer preferably has a function selected from electromagnetic wave shielding properties, antireflection properties, near infrared ray shielding properties, visible light absorption properties, and charge removal properties. The optical filter of the present invention can have a simple configuration.

  In addition, the present invention preferably relates to an optical filter for display in which the color of the frame printing portion is other than black. The display optical filter of the present invention is excellent in design.

  The present invention is a filter for a plasma display using the above optical filter. The filter for plasma display of the present invention is less likely to produce defective products, has an excellent surface shape of the frame printing portion, and is excellent in design.

  By using resin ink with light concealment in the frame printing part located outside the image display part of the optical filter, it is possible to reduce the film thickness of the frame printing part, which has become apparent in conventional black ceramic frame printing. It has become possible to suppress the entrapment of bubbles generated at the level difference between the frame printing portion and the substrate. On the other hand, even if the printed film thickness is thin, it is possible to maintain a sufficient light concealing property, and it is possible to form a frame printing portion having a clean surface shape that does not generate printing stripes and unevenness. Furthermore, by covering the frame printing portion with a protective layer, it becomes possible to provide an optical filter for display having excellent scratch resistance and high design, and thus the industrial significance of the present invention is great.

  The optical filter of the present invention has a frame printing portion containing a light shielding resin. The above-mentioned frame printing part is usually formed on the peripheral part on the transparent support. A specific example is a shape as shown in FIG. That is, the frame printing portion 1 is formed on the peripheral edge of the transparent support 2.

  A typical configuration of the optical filter of the present invention will be described with reference to FIG. 2 to FIG. 7 by taking an optical filter for plasma display as one embodiment as an example.

  2 to 7 are schematic views of typical optical filters. (The present invention is not limited only to the structure.) A frame printing portion 1 made of a light shielding resin is formed on the main surface of the transparent support 2, and the electromagnetic shielding layer 3 and the antireflection layer are formed thereon. Layer and electrode layer 5 having a property and / or near-infrared shielding property are laminated. Moreover, you may have the electromagnetic shielding layer 3 and the layer 4 which has antireflection property and / or near-infrared shielding property also on the main surface on the opposite side of the transparent support 2. The electromagnetic shielding layer 3 may be either a sputter type or a mesh type as will be described later.

  The optical filter of this invention can illustrate a structure like FIGS. 2-7 according to each layer structure of an end surface. FIG. 2 shows a structure in which the electromagnetic shielding layer 3 covers the entire surface of the frame printing unit 1 on the transparent support 2. In FIG. 3, a structure in which the layer 4 having antireflection properties and / or near-infrared shielding properties covers the entire surface of the frame printing portion 1 on the transparent support 2 and the electromagnetic shielding layer 3 is formed on the opposite side of the substrate. Show. FIG. 4 shows a structure in which a layer 4 having antireflection properties and / or near-infrared shielding properties is further formed on the electromagnetic wave shielding layer 3 of FIG. FIG. 5 shows a configuration in which a layer 4 having antireflection properties and / or near-infrared shielding properties is formed on the opposite main surface of the transparent support of FIG. 4 where the frame printing portion 1 is formed. FIG. 6 shows that the frame printing portion 1 is formed on the transparent support 2, and the frame printing portion 1 is completely covered with the electromagnetic shielding layer 3 and the layer 4 having antireflection and / or near-infrared shielding properties thereon. The electrode layer 5 is formed so as to straddle the frame printing layer 1, the electromagnetic shielding layer 3, the antireflection and / or the near infrared shielding layer 4, and exhibits porosity. Said electrode layer is a layer required in order to neutralize the electric current which generate | occur | produces when the electromagnetic wave shielding layer absorbs electromagnetic waves. FIG. 7 shows a structure in which a layer 4 having antireflection properties and / or near-infrared shielding properties is formed on the main surface of the transparent support 2 in FIG. 6 opposite to the frame printing portion 1.

  As described above, the optical filter of the present invention preferably has a laminated structure. In order to form this laminated structure, in addition to the method of bonding the members of each layer using an adhesive material, the bar coating method, reverse coating method, gravure coating method, die coating method, roll coating method, etc., or sputtering A known method such as a vacuum deposition method such as a method, an ion plating method, an ion beam assist method, a vacuum deposition method, or a wet coating method can be employed without limitation.

  Since the optical filter of the present invention requires flatness, dimensional stability, mechanical strength for protecting the display body, and ease of installation, it is preferable to use a plate-like transparent support. Moreover, in order to shield the electromagnetic wave which may generate | occur | produce from a display in this invention, it is preferable to form an electromagnetic wave shielding layer. This electromagnetic wave shielding layer can be formed mainly on either of the two main surfaces of the transparent support. A known transparent metal thin film layer or a metal mesh layer can be adopted as the electromagnetic shielding layer. These layers can be formed directly on the transparent support. In addition, a method in which a transparent conductive film is formed on a transparent film and a transparent conductive film is bonded to a transparent support with an adhesive or the like is used for productivity, ease of electrode formation, It can employ | adopt suitably in terms of obtaining a manual contact.

  As the transparent support, transparent glass, semi-tempered glass, tempered glass, transparent plastic and the like can be suitably used from the viewpoint of mechanical strength, lightness, and resistance to cracking. The transparent plastic film is not particularly limited as long as it is transparent in the visible range. For example, acrylic resin such as polymethyl methacrylate (PMMA), polyethylene terephthalate, polyethersulfone, polyarylate, polyacrylate, polycarbonate, transparent Examples include resin films and resin plates made of homopolymers such as ABS resin, polyether ether ketone, polyethylene, polyester, polypropylene, polyamide, polyimide, and copolymers of these resins with monomers copolymerizable. . In particular, PMMA can be suitably used because of its high transparency in a wide wavelength region and high mechanical strength. The thickness of the resin plate is not particularly limited, but is usually about 0.5 mm to 10 mm. Depending on the application, if the main surface is smooth, in addition to a plate (sheet) shape, a film shape thinner than the above thickness may be used. The thickness of the film is preferably 10 μm to 500 μm, more preferably 50 μm to 250 μm. Moreover, when using a glass plate as a transparent support body, it is desirable to use the semi-tempered glass plate or the tempered glass plate which performed the chemical strengthening process or the air-cooling strengthening process in order to add mechanical strength. The transparent support (1) can also contain a pigment.

  In general, the optical filter is attached to the front of the panel of the plasma display, but in the peripheral part outside the panel image display part, some of the connectors connected to the drive circuit etc. and seed light emission for improving the discharge characteristics of the plasma display It is preferable to shield these because they enter the field of view when viewing the display image. As one countermeasure, a method of providing a light shielding part at the peripheral part of the display window of the optical filter corresponding to the outside of the boundary of the light emitting part of the plasma display is employed. The light shielding part is formed by printing a black ink in a frame shape by a bar coating method, a reverse coating method, a gravure coating method, a die coating method, a roll coating method, a silk screen method or the like while leaving a display window of an optical filter. Generally, this part is called a frame printing part. Among them, the silk screen printing method is more preferably used because it can be printed easily and can be printed together with various frame sizes.

As a characteristic required for the above black frame printing,
1. Have sufficient light shielding ability.
2. There must be no uneven printing or streaks.
In addition to
3. Print as thin film as possible.
Is mentioned.

  In the third item, for example, if the level difference between the transparent support and the frame printing portion is large, bubbles are taken in at the level difference part (sometimes referred to as a wrinkle level difference) when the films are bonded (laminated). Since this grows with time and becomes a cause of appearance defects, this bubble has the necessary characteristics to cope with the fact that it is required to make the bubble as small as possible, preferably not at all. is there.

  Conventionally, for this black frame printing, an inorganic ceramic fired body has been used with a transparent support as a glass plate. Examples of the ceramic contained in the ink include oxides such as chromium oxide and iron oxide, carbides such as chromium carbide and tungsten carbide, carbon black, and mica. The frame printing section is obtained by melting these ceramics with an ink composed of silica, forming the ceramic into a frame shape, and then firing it. As described above, since the above-described ink requires a melting and baking process, it is generally used as a commercially available glass-only ink. However, the frame printing section using this inorganic ceramic fired body needs to have a relatively thick film thickness in order to exhibit light shielding properties. Is not necessarily enough.

Since the optical filter of the present invention has a frame printing portion formed using, for example, an ink containing a light shielding resin, the film thickness of the frame printing portion can be reduced, and sufficient light concealment can be maintained. Can do. For this reason, generation | occurrence | production of the bubble in the said wrinkle level | step difference part can be suppressed. In the optical filter of the present invention, the size of bubbles in the wrinkle step portion is preferably less than φ0.5 mm, more preferably φ0.3 mm or less. Further, the number is preferably less than 10 pieces / cm ² , more preferably 5 pieces / cm ² or less.

  Furthermore, since the frame printing portion of the present invention uses the above-described light shielding resin, it is more versatile while maintaining light shielding properties and a thin film thickness as compared to a frame printing portion made of an inorganic ceramic fired body. A frame printing unit having a color can be realized. Furthermore, the frame printing portion according to the present invention has an excellent surface shape, and can be easily realized in a shape without streaks or unevenness.

  In recent years, especially in the trend of reducing the price of PDPs (plasma display panels) by overseas manufacturers, optical filters with differentiated design have been required as one means for increasing the added value of products. As one of the methods, regarding the frame printing section, it is required to realize a frame printing section having various colors as well as black while having sufficient light hiding. The optical filter of the present invention is also suitable from the above points.

  On the other hand, the present inventors have revealed that problems such as printing unevenness, streaks, etc. become apparent because conventional color frame printing parts using inorganic ceramic inks cannot maintain sufficient light shielding ability. It has been confirmed.

  The light shielding resin may have insufficient scratch resistance and solvent resistance, but this is a protective layer such as a film layer, a laminate, a coating layer (UV curable / thermosetting resin), or a hard coat layer. Can be overcome by forming the above on the light shielding resin layer. As the protective layer, the electromagnetic wave shielding layer, the antireflection layer, the near-infrared shielding layer, the electrode layer, and the like shown in FIGS.

  As described above, the frame printing portion of the optical filter of the present invention preferably has high scratch resistance and solvent resistance. In the present invention, high scratch resistance means that the frame print layer is not damaged even in a scratch test with a surface pencil hardness of 4H. Therefore, the protective layer according to the present invention preferably has the above scratch resistance.

  Examples of the light shielding resin according to the present invention include epoxy resins, acrylic resins, polyethylene terephthalate, polyethersulfone, polyarylate, polyacrylates, polycarbonates, transparent ABS resins containing light shielding dyes and pigments. , Polyetheretherketone, polyethylene, polyester, polypropylene, polyamide, polyimide, and other homopolymers, and resins composed of copolymers of these resins with monomers that can be copolymerized. The dye or pigment is not particularly limited as long as it can block visible light. Dyes, imonium dyes, dithiol metal complexes, azo compounds, anthraquinone dyes, nitroso pigments, nitro pigments, or metal fine particles such as aluminum powder, copper powder, silver powder, titanium oxide, zinc oxide And metal oxide fine particles such as chromium carbide and metal carbide fine particles such as chromium carbide. Since these various materials can be used, the optical filter of the present invention can realize a filter having a frame printing portion of many colors.

  For the printing of the resin ink on the transparent support, known methods such as a bar coating method, a reverse coating method, a gravure coating method, a die coating method, a roll coating method, and a silk screen method can be used without limitation. Among these, the silk screen printing method is more preferable because it can be printed easily and can be printed together with various frame sizes.

  As for the thickness of the frame printing part according to the present invention, it is preferable that the frame printing wrinkle step is as small as possible because the generation of bubbles is suppressed. Specifically, as observed in conventional black ceramic frame printing, when a frame is formed with a thickness of about 15 to 20 μm, a step is generated between the glass flat portion and the frame printing site, and an electromagnetic shielding layer is formed as a protective layer. , And / or antireflection layer, and / or near-infrared shielding layer, and / or light absorption layer, and / or electrode layer are stuck together using adhesive material, bite of bite occurs in the frame wrinkles And may cause poor appearance. Therefore, the film thickness of the frame printing portion by the organic ink is preferably less than 15 μm, more preferably 10 μm or less.

  Inorganic black frame printing can be obtained by forming a desired shape by, for example, silk screen printing, and drying and baking the ceramic at several hundred degrees Celsius. On the other hand, the frame printing unit using the above resin is a method of forming a desired shape by mixing two or more liquid inks by silk screen printing or the like and printing at room temperature in the case of frame printing of epoxy resin, for example. Can be illustrated. In the case of using an acrylic resin, a method of preparing a desired shape of the corresponding resin solution by the above printing method and curing it by ultraviolet (UV) irradiation can also be applied.

  As described above, since the frame printing layer containing the light shielding resin of the present invention can be formed under mild conditions, it is also preferable in that it can be applied to various transparent support substrates.

  As described above, the optical filter of the present invention may have an electromagnetic wave shielding layer, an antireflection layer, a near infrared shielding layer, an electrode layer, and the like. Of course, other known layers such as an antiglare layer, an antifouling layer, an anti-Newton ring layer, a UV cut layer, a hard coat layer, a toning layer and the like may be used. These layers can be laminated with a film having the above functions, or can be formed directly on a filter by using a coating method, a vacuum film forming method, or the like. In addition, the toning layer and the UV cut layer are formed by adding a dye or a UV absorber selected according to the use in the pressure-sensitive adhesive layer or the adhesive layer used for bonding. Is also possible.

  The details described in, for example, Japanese Patent No. 3004222 and Japanese Patent Application Laid-Open No. 2002-323861 can be applied to the details such as the electromagnetic wave shielding layer and the antireflection layer and the bonding method.

  The optical filter of the present invention can be used as a filter for various displays. In particular, it can be suitably used as a filter for plasma display.

  The optical filter of the present invention has excellent light shielding properties even if the frame printing portion is thinned. For this reason, when bonded to a film member or the like, bubbles are unlikely to be generated in the wrinkle step portion of the frame printing portion, and there are few occurrences of defective products due to poor appearance. In addition, since a frame printing section with various colors can be realized, an optical filter excellent for design students can be obtained.

  Whether or not the resin ink is used in the frame printing portion of the optical filter of the present invention is determined by, for example, carefully removing the protective layer and then dissolving by FD-MS, GC-MS, NMR, XRD, and various organic solvents. It can be easily detected by infrared absorption spectrum analysis (IR), nuclear magnetic resonance spectrum analysis (NMR), liquid chromatography (LC), etc. of the test and solvent extraction components. The structure of the optical filter can be easily observed with a cross-sectional SEM, cross-sectional TEM, FIB-TEM (SEM), AFM, optical microscope, or the like.

  As for the surface hardness of the frame printing portion, a simple method is to perform a surface scratch test from the upper surface of the optical filter and evaluate the pencil hardness.

  In addition, regarding the degree of bubble generation in the frame printing wrinkle step portion, the number of occurrences and the size can be measured by observing the resin-based frame printing site with a loupe with transmitted light such as a fluorescent lamp. Regarding the film thickness of the frame printing part that induces the generation of bubbles in the wrinkle step part, the optical filter can be cut out and measured with a surface step meter or AFM.

  Hereinafter, the present invention will be described by way of examples. The present invention is not limited to the scope of these examples.

Example 1
An optical filter having a laminated structure as shown in FIG. 8 was produced by the following method.
The frame printing part 1 is formed by silk printing on a semi-tempered glass plate 20 (manufactured by Central Glass Co., Ltd.) using an epoxy resin ink containing an aluminum filler, plate thickness: 2.5 mm, external dimensions: 1001.8 mm × 590.8 mm; Inner frame size: A substrate of 921 mm × 519 mm was used.
Using a laminator, an electromagnetic shielding sputter film 30 (manufactured by Mitsui Chemicals Co., Ltd.) having a 75 μm thick indium oxide thin film / silver thin film laminated structure in which a dye adhesive material having a thickness of 25 μm is coated on the main surface of the substrate is measured using a laminator It bonded together to the size of 997.8 mm x 587 mm. Further thereon, an antireflection film 40 having a thickness of 105 μm (AR film: Realak 7702UV manufactured by NOF Corporation) was bonded to a size of 969.8 mm × 561 mm using a laminator. Similarly, on the opposite main surface of the semi-tempered glass 20, an antireflection film 40 (AR film: Realoc 7702UV manufactured by Nippon Oil & Fats Co., Ltd.) was bonded to the entire surface using a laminator. After laminating, autoclave treatment (65 ° C., 14 kgf / cm ² 60 minutes holding) was performed to obtain an optical filter. This filter is used such that the surface opposite to the surface on which the frame printing unit 1 is formed is the viewing side.
The optical filter obtained as described above has a laminated structure as shown in FIG. In addition, it had a silver frame that was unprecedented and had a beautiful frame printing surface with no printing unevenness or streaks. In addition, the generation of bubbles in the frame printing wrinkles with a step was suppressed to less than φ0.5 mm and 3 / cm ² .
The results are summarized in Table 1 for the characteristics of the frame printing portion 1 of the electromagnetic wave shielding filter for display.

Example 2
An optical filter having a laminated structure as shown in FIG. 9 was produced by the following method.
The frame printing portion 1 is formed by silk printing on a semi-tempered glass plate 20 (manufactured by Central Glass Co., Ltd.) using an epoxy resin ink containing an aluminum filler. 590.8 mm; Frame inner dimension: A substrate of 921 mm × 519 mm was used.
Using a laminator, an electromagnetic shielding mesh film 35 (MR420F0L-100, manufactured by Dai Nippon Printing Co., Ltd.) made of a copper mesh with a thickness of 125 μm coated with a dye adhesive material with a thickness of 25 μm on the main surface of the substrate is 999 mm × It bonded together to the size of 588 mm. Furthermore, a 110 μm-thick near-infrared shielding film 45 (NIR film: Clearlass NIR-MC03N manufactured by Sumitomo Osaka Cement Co., Ltd.) was bonded to a size of 961.8 mm × 554 mm using a laminator. On the opposite main surface of the semi-tempered glass 20, an antireflection film 40 (AR film: Realoc 7702UV manufactured by NOF Corporation) was bonded to the entire surface using a laminator. After laminating, an autoclave treatment (holding at 65 ° C. and 14 kgf / cm ^{2 for} 60 minutes) was performed to obtain an optical filter. This filter is used so that the surface opposite to the surface on which the frame printing unit 1 is formed is the viewing side.
The optical filter obtained as described above has a laminated structure as shown in FIG. In addition, it had a silver frame that was unprecedented and had a beautiful frame printing surface with no printing unevenness or streaks. Further, the generation of bubbles in the frame printing wrinkle portion having a step was suppressed to less than φ0.5 mm and 5 / cm ² .
The results are summarized in Table 1 for the characteristics of the frame printing section 1 of the optical filter.

Example 3
Except that the silver electrode printing layer 50 was formed by applying silver paste (MSP600F manufactured by Mitsui Chemicals, Inc.) by screen printing in a range of 18 mm wide so as to cover the periphery of the edges of the sputter film 30 and antireflection film 40 and drying at room temperature. In the same manner as in Example 1, an optical filter of the present invention as shown in FIG. 10 was produced. At this time, the frame printing unit 50 was completely covered with the sputter film 30, the antireflection film 40, and the silver paste printing 50.
The optical filter has a silver frame that is unprecedented and has a beautiful frame printing section 1 that does not show any printing unevenness or streaks. Moreover, the sputter | spatter film 30, the antireflection film 40, and the silver electrode printing layer 50 were not visually recognized through the frame printing part 1 from the visual recognition side. In addition, in the pencil hardness test at a pencil hardness of 4H of the frame printing section, the frame printing section 1 viewed from the viewing side main surface was not changed, although the silver paste side was slightly scratched. Further, the generation of bubbles in the frame printing wrinkle region was suppressed to less than φ0.5 mm and 3 / cm ² . The results of the frame printing section 1 of the display filter are summarized in Table 1.

Example 4
Except that the silver electrode printing layer 50 is formed by applying silver paste (MSP600F manufactured by Mitsui Chemicals, Inc.) by screen printing in a range of 18 mm width so as to cover the periphery of the edges of the mesh film 35 and the near-infrared shielding film 45 and drying at room temperature. In the same manner as in Example 1, an optical filter of the present invention as shown in FIG. 10 was produced. At this time, the frame printing unit 50 was completely covered with the sputter film 30, the antireflection film 40, and the silver paste printing 50.
The optical filter has a silver frame that is unprecedented and has a beautiful frame printing section 1 that does not show any printing unevenness or streaks. Moreover, the mesh film 35, the near-infrared shielding film 45, and the silver electrode printing layer 50 were not visually recognized through the frame printing part 1 from the visual recognition side. In addition, in the pencil hardness test at a pencil hardness of 4H of the frame printing section, the frame printing section 1 viewed from the viewing side main surface was not changed, although the silver paste side was slightly scratched. Further, the generation of bubbles in the frame printing wrinkle region was suppressed to less than φ0.5 mm and 5 / cm ² . The results of the frame printing section 1 of the display filter are summarized in Table 1.

Comparative Example 1
An electromagnetic wave shielding filter for a display having the same configuration and size as in Example 3 was prepared except that a substrate on which a black frame printing portion (see Table 1) made of inorganic ceramic was formed by a printing method as in the past was used.
Bubbles in the frame print wrinkle region were observed with a size of about φ0.5 mm to 1.0 mm connected to 10 pieces / cm ² or more. In addition, since it is a conventional black picture frame printing filter, it was not particularly replaced in terms of design and appearance.
The results are summarized in Table 1 for the characteristics of the frame printing portion of the optical filter.

Comparative Example 2
An electromagnetic wave shielding filter for display having the same configuration and size as in Example 3 was prepared except that a substrate on which a silver color frame printing portion (see Table 1) formed of inorganic ceramic was formed as in the conventional case. In addition, thin color unevenness (streaks) was observed with the naked eye at four corners. In addition, the generation of bubbles in the frame printing wrinkles with steps is less than φ0.5mm and 5 / cm ² , but the light shielding property of visible light cannot be obtained, and the sputter film, antireflection film, electrode printing The layer was visible through the frame print. In addition, printing unevenness and streaks were observed in the frame printing section.
The results are summarized in Table 1 for the characteristics of the frame printing portion of the optical filter.

It is a top view which shows the outline | summary of the shape of the frame printing part of the optical filter of this invention. It is sectional drawing which shows an example of the optical filter of this invention. It is sectional drawing which shows an example of the optical filter of this invention. It is sectional drawing which shows an example of the optical filter of this invention. It is sectional drawing which shows an example of the optical filter of this invention. It is sectional drawing which shows an example of the optical filter of this invention. It is sectional drawing which shows an example of the optical filter of this invention. 2 is a cross-sectional view illustrating an outline of a configuration of an optical filter created in Example 1. FIG. 6 is a cross-sectional view illustrating an outline of a configuration of an optical filter created in Example 2. FIG. 6 is a cross-sectional view illustrating an outline of a configuration of an optical filter created in Example 3. FIG. FIG. 6 is a cross-sectional view schematically showing the configuration of an optical filter created in Example 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame printing part 2 Transparent support 3 Electromagnetic wave shielding layer 4 Layer which has anti-reflective property and / or near-infrared shielding 5 Electrode layer 20 Semi-strengthened glass plate 30 Sputtered film 35 Mesh film 40 AR film 45 NIR film 50 Silver electrode printing layer

Claims (5)

An optical filter having a frame printing portion containing a light-shielding resin. The optical filter according to claim 1, wherein the frame printing portion has a laminated structure including a protective layer. The optical filter according to claim 2, wherein the protective layer has a function selected from electromagnetic wave shielding properties, antireflection properties, near infrared ray shielding properties, visible light absorption properties, and static elimination properties. The optical filter according to claim 1, wherein the frame printing portion has a color other than black. A filter for plasma display using the optical filter according to claim 1.

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