JP2001083890A - Display front plate and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display front plate which can be improved in the productivity, which does not decrease the visibility and sharpness of a picture or image projected on the display are not decreased, and which can sufficiently prevent damages such as peeling of an electromagnetic shield layer, and to realize the production method of the plate. SOLUTION: In the production method of the display front plate, a shield mesh 15 having shielding property against electromagnetic waves is housed in a die 10, a liquid material 14 containing a polymerizable resin monomer is injected into the die 10 and the liquid material 14 is polymerized and solidified to obtain the display front plate having a transparent substrate containing the aforementioned resin and having the shield mesh 15 embedded in the transparent substrate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a display front panel and a method of manufacturing the same, and more particularly, to a display front panel having an electromagnetic wave shielding property and a method of manufacturing the same.

Generally, a front panel of a display (hereinafter, referred to as a front panel)
The “display front plate” is used for the purpose of preventing image blurring due to reflection of illumination light and the like, and for protecting the display surface and preventing the display surface from being stained. Various kinds of stains are used. Some displays, such as a plasma display panel (PDP) and EL display panels, emit near-infrared light in addition to visible light. May cause malfunction of the remote control system. Further, some of the above-mentioned displays emit high-frequency (several kHz to several GHz) electromagnetic waves, and this electromagnetic wave causes peripheral devices to malfunction or generate high-frequency noise, which is a problem of so-called EMI (Electromagnetic Interference). Has been pointed out. In order to solve such a problem, Japanese Patent Application Laid-Open No. H10-153964 and Japanese Patent Application Laid-Open No.
Japanese Patent Application Laid-Open Publication No. H11-157, etc. disclose a display front plate having an electromagnetic wave shielding layer laminated on a resin plate containing a copper compound and a phosphoric acid ester compound and having near-infrared light absorption and electromagnetic wave shielding.

[0003]

However, in order to manufacture the above display front plate, after forming and processing a resin plate, an electromagnetic wave shielding layer is bonded to the surface of the resin plate using an adhesive or the like. A step of further laminating the shielding layer with a coating material such as a resin film after the lamination is necessary, which has resulted in an increase in the number of parts and man-hours. Further, the light emitted from the display may be scattered by the adhesive or the coating material, and the clarity of an image or image projected on the display may be reduced. Furthermore, the electromagnetic wave shielding layer may be peeled off due to deterioration with time of the adhesive component or the like.

Therefore, the present invention has been made in view of such circumstances, and can improve productivity, without impairing the visibility and clarity of an image projected on a display, and It is another object of the present invention to provide a display front plate capable of sufficiently preventing damage such as peeling of an electromagnetic wave shielding layer and a method of manufacturing the same.

[0005]

That is, a display front plate according to the present invention comprises a transparent substrate containing a resin, and a conductive member embedded in the transparent substrate and shielding electromagnetic waves. It is characterized by the following. In the display front plate configured as described above, light emitted from the display passes through the transparent substrate, so that images and images projected on the display can be clearly seen. In addition, since the electromagnetic wave emitted from the display is sufficiently weakened by the conductive member, malfunction of the peripheral device due to the electromagnetic wave and the display becoming a noise source are effectively prevented. Then, the electromagnetic wave is sufficiently reduced (that is, EMI is sufficiently removed).
Therefore, it is possible to prevent the human body from being exposed to the electromagnetic waves while watching the video or image on the display. Further, since this conductive member is embedded in the transparent substrate, compared to the conventional method of pasting the electromagnetic wave shielding layer to the transparent substrate,
The manufacturing process is simplified, the number of steps can be reduced, and the thickness of the display front plate can be reduced. Further, since no adhesive or coating material is required, the number of parts can be reduced as compared with the conventional case. Also,
Since an adhesive or a coating material is not necessary, scattering of light emitted from the display due to these is less likely to occur. further,
Since the conductive member is embedded in the transparent substrate without using an adhesive or a coating material, there is no possibility that damage such as peeling of the electromagnetic wave shielding layer, which has been a problem in the past, may occur. Moreover, since the conductive member is embedded in the transparent substrate, there is an advantage that the conductive member functions as a reinforcing material and the mechanical strength and impact resistance of the transparent substrate are enhanced.

It is preferable to use, as the conductive member, a mesh member in which conductive thin wires are braided, a so-called shield mesh (mesh for electromagnetic wave shielding). As a shield mesh, for example, Japanese Patent Application Laid-Open
The conductive mesh described in -11967 can be used. In particular, it is preferable that the thin wires constituting the shield mesh are made of metal-coated organic fibers from the viewpoints of weight reduction, toughness, flexibility and the like of the shield mesh. In addition, since such a shield mesh has an opening, compared to using a film-shaped conductive member, for example, when the material of the transparent substrate is a liquid polymerizable resin, the liquid material is used. Easy to embed inside. Further, as described in JP-A-11-119674, the opening area may be adjusted by appropriately selecting the mesh size of the shield mesh and the wire diameter of the fine wire. By doing so, the transmissivity of light emitted from the display can be sufficiently ensured, and the visibility and clarity of images and images projected on the display can be prevented from lowering, and good electromagnetic shielding properties can be achieved. It is possible.

The transparent substrate is preferably formed from a resin composition containing a phosphate compound represented by the following formula (1), a copper compound, and a resin.

[0008]

Embedded image

[In the formula (1), R is the following formula (2):
A group represented by (3), (4), (5), (6), (7), (8) or (9), an alkyl group, an aryl group, an aralkyl group, or an alkenyl group; R is 1 or 2, and when n is 1, R may be the same or different.

[0010]

Embedded image

(In the formulas (2) to (9), R ^{11 to} R ^{17 each} represent an alkyl group having 1 to 20 carbon atoms, an aryl group or an aralkyl group having 6 to 20 carbon atoms (however, A hydrogen atom bonded to a constituent carbon atom may be substituted by at least one of an alkyl group having 1 to 6 carbon atoms or a halogen), and R ^{21 to} R ²⁵ are each a hydrogen atom or a carbon atom having 1 carbon atom.
Indicates to 4 alkyl groups (except when R ^23, R ^24, R ²⁵ are all hydrogen atoms), R ³¹ and R ³² represents an alkylene group having 1 to 6 carbon atoms, R ⁴¹ is a carbon Number is 1 to 10
Wherein R ⁵¹ and R ^{52 each} have 1 to 2 carbon atoms.
0 represents an alkyl group, R ⁶¹ represents a hydrogen atom or a methyl group, m represents an integer of 1 to 6, k represents an integer of 0 to 5, p represents an integer of 2 to 97, and r represents Shows an integer of 1 to 10. )]

In the display front plate having such a transparent substrate, the phosphate group of the above-mentioned phosphate compound binds to the copper ion through coordination bond and / or ionic bond, and the copper ion is surrounded by the phosphate ester. Is dissolved or dispersed in the resin in a state of being put into the resin. Then, since near-infrared light is absorbed by the electron transition of the d-orbit of the copper ions, a display front panel having excellent selective absorption of near-infrared light can be obtained. In particular, when the above-mentioned compounds are used as the phosphoric ester compound, the near-infrared light absorption is particularly improved. On the other hand, since visible light is not absorbed by the above-mentioned electronic transition of copper ions, the visibility and clarity of images and images on the display are not impaired.

Further, the conductive member is a planar member, and the conductive member is preferably represented by the following formula (10): 0.01 mm ≦ Dav ≦ 0.5 mm (10) wherein Dav is The average distance (mm) between one surface of the transparent substrate and the surface of the conductive member facing this one surface is shown. ], More preferably the following formula (11); 0.01 mm ≤ Dav ≤ 0.3 mm ... formula (11) Particularly preferably, the following formula (12); 0.01 mm ≤ Dav ≤ 0.1 mm ... formula (12) More preferably, it is embedded in a transparent substrate so as to satisfy the relationship. In such a display front panel, the conductive member is disposed very near the surface in the transparent substrate. If this display front plate is installed such that the transparent substrate surface where the conductive member is located in the vicinity faces the display, the conductive member comes close to the panel surface of the display. Light emitted from the light emitting cells constituting the display is emitted so as to spread at a certain radiation angle, but when the conductive member and the panel surface of the display are close to each other as described above, the light is hardly scattered. Therefore, it is possible to further prevent a decrease in the visibility and clarity of the video or image projected on the display.

The method for manufacturing a display front plate according to the present invention is a method for suitably manufacturing the display front plate according to the present invention, in which a conductive member having an electromagnetic wave shielding property is housed in a mold, and the mold is formed. A liquid material containing a polymerizable resin monomer is injected, and the liquid material is polymerized and solidified. With this configuration, it is not necessary to bond a separately prepared or manufactured member serving as an electromagnetic wave shielding layer to the transparent substrate using an adhesive or a coating material after manufacturing the transparent substrate as in the related art. Therefore, since the display front panel having the electromagnetic wave shielding property can be obtained at once in the process of manufacturing the transparent substrate, the number of steps is reduced and the number of steps is reduced.
In addition, the number of parts is reduced. Therefore, the productivity of the display front panel can be remarkably improved. Also,
The obtained display front plate has a special effect as described above.

Further, it is preferable to use, as the liquid material, a resin composition containing the phosphate compound represented by the formula (1), a copper compound, and a polymerizable resin monomer. The phosphate compound and the copper compound are easily dissolved or dispersed in the polymerizable resin monomer, and the copper ions are easily dispersed uniformly in the liquid material. By polymerizing and solidifying such a liquid material, a copper ion is uniformly dispersed, and a display front panel having good near-infrared light absorption over the entire surface can be obtained. Further, as described above, the display front plate containing the phosphate compound and the copper compound has extremely excellent near-infrared light absorption.

Further, the mold includes at least two opposing plate-like members and a sealing member disposed at a peripheral portion between the plate-like members, and a conductive member is accommodated therein. It is preferable that the liquid material is polymerized and solidified in a state where the mold into which the liquid material has been injected is held such that the opposing plate-like bodies are arranged vertically. This prevents the conductive member from being exposed to the outside from the transparent substrate surface. This is presumably because the liquid material permeates into the minute gaps between the conductive member and the glass substrate surface due to its fluidity, and the liquid material is polymerized and solidified in that state. Therefore, the above equation (1)
It is possible to reliably and easily obtain a display front plate in which a conductive member is embedded in a transparent substrate so as to satisfy the relationship of 0). Further, since the conductive member is not exposed to the outside from the transparent substrate surface, the smoothness of the transparent substrate surface is maintained.
Therefore, workability such as post-processing of the transparent substrate surface can be improved.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a display front panel and a method of manufacturing the same according to the present invention will be described in detail. Note that the same components are denoted by the same reference numerals, and redundant description will be omitted. FIG. 1 is a cross-sectional view schematically showing a state in which a method for manufacturing a display front plate of the present invention is performed, and FIG. 2 is a cross-sectional view showing one embodiment of the display front plate of the present invention. First, a glass substrate 11b as a plate-like body is placed flat, and a packing 12 as a sealing member is arranged on a peripheral portion on the glass substrate 11b. Then, another glass substrate 11a is placed thereon, and the glass substrates 11a and 11b are arranged so as to face each other with the packing 12 interposed therebetween. Next, the glass substrates 11a and 11b
Is clamped from outside of the glass substrates 11a and 11b with a clamp, and the inner surfaces of the glass substrates 11a and 11b are pressed against the packing 12 to assemble the mold 10. In this state, a shield mesh 15 as a conductive member having a planar shape is accommodated in the inner space of the mold 10 formed by the glass substrates 11a and 11b and the packing 12. Next, a liquid material 14 containing a polymerizable resin monomer, which is a material of the transparent substrate, is injected into the internal space, and the internal space is hermetically sealed.

Next, the liquid material 14 is polymerized and solidified under polymerization conditions suitable for the components and amounts of the liquid material 14 while the mold 10 is left horizontally, and after the polymerization and solidification is completed,
The clamp 13, the glass substrates 11a and 11b, and the packing 12 of the mold 10 are removed, and the resin molded body in which the liquid material 14 is solidified and becomes a plate shape is released. By cutting this plate-like body into a shape having desired vertical and horizontal dimensions, a display front panel 2 including a transparent substrate 21 shown in FIG.
Get 0. When the liquid material 14 is polymerized and solidified, the shield mesh 15 sinks below the liquid material 14 by its own weight and is located on the glass substrate 11b side. As a result, as shown in FIG. 2, the shield mesh 15 is arranged near the surface 21b of the transparent substrate 21. According to the method for manufacturing a display front panel of the present invention, the shield mesh 15
Is not fixed in a state of being exposed from the surface 21b of the transparent substrate 21 to the outside, and it has been confirmed that the surface 21b of the transparent substrate 21 is smooth. This is because the liquid material 14 has a fluidity that causes the shielding mesh 15 and the glass substrate 1 to flow.
It is presumed that the liquid material permeated into the fine voids with the surface 1b and the liquid material was polymerized and solidified in that state.

In the display front panel 20, the shield mesh 15 is preferably represented by the following formula (1).
3); 0.01 mm ≦ D′ av ≦ 0.5 mm Equation (13) [where D′ av is the average of the surface 21 b of the transparent substrate 21 and the surface of the shield mesh 15 facing the surface 21 b. Indicates the distance (mm). However, since the shield mesh 15 is formed by braiding a thin wire, the “surface of the shield mesh” includes the point coordinates located closest to the surface 21 b on the surface of each thin wire constituting the shield mesh 15. Let it be a virtual plane. And more preferably the following formula (1)
4); 0.01 mm ≦ D′ av ≦ 0.3 mm Equation (14) Particularly preferably, the following equation (15): 0.01 mm ≦ D′ av ≦ 0.1 mm Equation (15) is satisfied. Embedded in the transparent substrate 21.

FIG. 3 is a perspective view showing a use state of the display front panel 20 shown in FIG. As shown in FIG. 3, the display front plate 20 is
1a is arranged forward, that is, the surface 21b of the transparent substrate 21 in which the shield mesh 15 is located is opposed to and close to the panel surface 41 of the PDP 4 as a display. The display front plate 20 is a PD
The plane size is larger than the panel surface 41 of P4, and the entire panel surface 41 is covered by the display front plate 20. Further, the shield mesh 15 embedded in the display front plate 20 is pulled out from an end face of the display front plate 20, for example, at least one of four corners of the display front plate 20, and connected to an unillustrated housing ground of the PDP 4. I have.

According to the display front panel manufacturing method and the display front panel 20 described above, the light emitted from the panel surface 41 of the PDP 4 reaches the display front panel 20 disposed in front of and near the panel surface 41. Since the transparent substrate 21 constituting the display front panel 20 has translucency, the images and images projected on the panel surface 41 can be clearly seen. In addition, since the electromagnetic wave emitted from the panel surface 41 is sufficiently reduced by the shield mesh 15, a malfunction due to the electromagnetic wave of the peripheral device,
PDP 4 is sufficiently prevented from becoming a high frequency noise source. Also, since electromagnetic waves are sufficiently reduced in this way,
It is possible to prevent the human body from being exposed to electromagnetic waves while watching a video or image on the panel surface 41 of the PDP 4.

Further, since the shield mesh 15 is embedded in the transparent substrate, the manufacturing process can be simplified and the number of steps can be reduced, and the thickness of the display front plate 20 can be reduced as compared with the conventional case. It is possible to do. Further, since no adhesive or coating material is required, the number of parts is reduced as compared with the related art. As a result, the productivity of the display front panel 20 can be significantly improved. In addition, since an adhesive or a coating material is unnecessary, there is no possibility that light emitted from the panel surface 41 of the PDP 4 is scattered by the adhesive or the coating material. Therefore, it is possible to sufficiently prevent the sharpness of the image projected on the panel surface 41 from being reduced. Further, since the shield mesh 15 is embedded in the transparent substrate 21, there is no disadvantage such as peeling of the electromagnetic wave shielding layer, which is a problem in the related art. In addition, since the shield mesh 15 is embedded in the transparent substrate 21, the shield mesh 15 serves as a reinforcing material, and the mechanical strength and impact resistance of the transparent substrate 21 can be increased.

Further, the shield mesh 15 used as the conductive member is a braided thin wire and has an opening (gap), so that, for example, a film-shaped conductive member is used. Therefore, it easily sinks into the liquid material 14 and is easily embedded in the transparent substrate 21. And
If the mesh size of the shield mesh 15 and the wire diameter of the fine wire are appropriately selected and the opening area is adjusted, the transmissivity of light emitted from the display is sufficiently ensured, and the image and the image projected on the display are displayed. It is possible to prevent the visibility and the sharpness from being lowered, and to achieve good electromagnetic wave shielding properties. When metal-coated organic fibers are used as the thin wires constituting the shield mesh 15, it is preferable from the viewpoint of the toughness and flexibility of the shield mesh 15, and moreover, the weight of the shield mesh 15 and thus the display front panel 20 can be reduced. Furthermore, since the shield mesh 15 has conductivity and is grounded, the display front panel 20 is less likely to be charged with static electricity. Therefore, adhesion of dust and the like on the display front panel 20 due to the electrostatic action can be suppressed.

Further, the shield mesh 15 is embedded in the transparent substrate 21 so as to satisfy the relationship shown in the above formula (11), and as shown in FIG. 3, the display front plate 20 is positioned near the shield mesh 15. Surface 21b
Is disposed so as to face and be close to the panel surface 41 of the PDP 4, so that the shield mesh 15 is in a state extremely close to the panel surface 41. Therefore, light rays emitted from the light emitting cells constituting the PDP 4 are less likely to be scattered, so that it is possible to further prevent a decrease in the visibility and clarity of an image or image projected on the panel surface 41 of the PDP 4. . In addition, since the liquid material 14 is polymerized and solidified in a state where the mold 10 is placed flat and still, the shield mesh 15 is embedded in the transparent substrate 21 so as to satisfy the relationship of the above formula (11). Display front panel 2
0 can be reliably and easily obtained.

The polymerizable resin monomer contained in the liquid material 14 is not particularly limited as long as it has transparency to visible light after polymerization and solidification. An acrylic resin or a monomer of a resin other than the acrylic resin can be preferably used, and an acrylic resin is preferred from the viewpoint of transparency, weather resistance, and the like. As the acrylic resin monomer, a (meth) acrylate monomer is preferable, and specific examples of the (meth) acrylate monomer include methyl (meth) acrylate and ethyl (meth) acrylate. , N-
Alkyl (meth) acrylates such as propyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, tertiary butyl (meth) acrylate, n-hexyl (meth) acrylate, and n-octyl (meth) acrylate , Glycidyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, isobornyl (meth) acrylate, methoxypolyethylene (meth) acrylate, phenoxy ( Modified (meth) acrylates such as meth) acrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, polyethylene glycol di (meth)
Acrylate, polypropylene glycol di (meth) acrylate, 1,3-butylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (Meth) acrylate, 2-hydroxy-1,3-di (meth) acrylate, 2,2-bis [4- (meth) acryloxyethoxyphenyl] propane, 2-hydroxy-1- (meth) acryloxy-3- Multifunctional (meth) such as (meth) acryloxypropane, trimethylolpropane tri (meth) acrylate, pentaerythrit tri (meth) acrylate, pentaerythrit tetra (meth) acrylate
Acrylates and the like. Note that the meaning of “meth” enclosed in parentheses is used for convenience to simplify the description when it is necessary to describe both acrylic acid or a derivative thereof and methacrylic acid or a derivative thereof. This is a description method, which is also adopted in this specification.

Further, as another acrylic resin, other (meth) acrylic ester monomers and other copolymerizable copolymerizable with the (meth) acrylic ester monomers can be used. Monomers may also be used. Specific examples of such a copolymerizable monomer include (meth) acrylic acid, 2- (meth) acryloyloxyethylsuccinic acid, and 2- (meth) acrylic acid.
Unsaturated carboxylic acids such as acryloyloxyethylphthalic acid, acrylamides such as N, N-dimethylacrylamide, fragrances such as styrene, α-methylstyrene, chlorostyrene, dibromostyrene, methoxystyrene, vinylbenzoic acid, and hydroxymethylstyrene Group vinyl compounds and the like.

Further, there may be mentioned aromatic vinyl compounds such as styrene, α-methylstyrene, chlorostyrene, dibromostyrene, methoxystyrene, vinylbenzoic acid and hydroxymethylstyrene. The above resin monomers can be used alone or in combination of two or more. When only a monofunctional resin monomer is used, a thermoplastic transparent substrate 21 is obtained. Since the curable transparent substrate 21 is obtained, by appropriately selecting these resins and including them in the liquid material 14, it is possible to obtain the display front panel 20 according to the purpose of use, application, processing method, and the like. If a thermoplastic material is used, remolding after polymerization and solidification is facilitated, so that the formability of the display front panel 20 can be improved. Further, a light diffusing agent, a coloring agent, a release agent, a stabilizer, an ultraviolet absorber, an antioxidant, an antistatic agent, a flame retardant, and the like may be appropriately added to the liquid material 14 as needed. .

It is preferable that the liquid material 14 further contains a phosphate compound represented by the formula (1) and a copper compound. In this case, the phosphate group of the phosphate compound binds to the copper ion through a coordination bond and / or an ionic bond, and the copper ion is dissolved or dissolved in the transparent substrate 21 in a state surrounded by the phosphate ester. Distributed. And since near-infrared light is absorbed by the electron transition of the d-orbit of the copper ions, the display front panel 20 having excellent selective absorption of near-infrared light can be obtained. Further, the above-mentioned phosphate compound and copper compound are easily dissolved or dispersed in the polymerizable resin monomer, and the liquid material 1
4 easily disperses copper ions uniformly. Therefore, by polymerizing and solidifying such a liquid material 14, copper ions are uniformly dispersed, and a display front panel 20 having good near-infrared light absorption over the entire surface is obtained.

In particular, when the above-mentioned compounds are used as the phosphoric ester compound, the near-infrared light absorption is particularly improved.
Therefore, the near-infrared light emitted from the panel surface 41 of the PDP 4 shown in FIG. 3 is sufficiently absorbed by the display front panel 20, and preferably has an intensity of 20% or less, more preferably 15% or less, and particularly preferably. Preferably, it is reduced to 10% or less. In this way, the possibility that a malfunction of the peripheral device that performs near-infrared light communication is caused can be significantly reduced. On the other hand, since visible light is hardly absorbed by the above-mentioned electronic transition of copper ions, the panel surface 4
1 can be viewed without any trouble, and there is no possibility that the visibility and clarity of the image and the image are impaired.

As the above-mentioned copper compound, a copper salt for supplying copper ions is used. Specific examples thereof include copper acetate, copper acetate monohydrate, copper formate, copper stearate, copper benzoate. Copper salts of organic acids such as copper, ethyl acetoacetate, copper pyrophosphate, copper naphthenate, copper citrate, anhydrides and hydrates, or copper hydroxide, copper chloride, copper sulfate, copper nitrate, basic copper carbonate, etc. And anhydrides and hydrates of copper salts of inorganic acids. Of these, copper acetate, copper acetate monohydrate, copper benzoate, copper hydroxide, and basic copper carbonate are preferably used. The liquid material 14 may contain metal ions other than copper ions (hereinafter, referred to as “other metal ions”). Examples of other metal ions include sodium, potassium, calcium, iron, and manganese. , Magnesium, nickel and the like.

FIG. 4 is a sectional view showing another preferred embodiment of the display front panel according to the present invention. FIG.
The display front plate 30 shown in FIG. 2 is provided on the surface 21b of the transparent substrate 21 shown in FIG.
R) and an anti-glare (anti-glare; AG) coated film 32 are bonded together, and AR film is formed on the opposite surface 21a.
The coated film 31 is bonded. The display front plate 30 thus configured
Is replaced with a PD shown in FIG.
It is also suitable to install it in front of P4. At this time, it is preferable to arrange the display front panel 30 so that the film 32 faces the panel surface 41 because the shield mesh 15 is close to the panel surface 41.

In this case, external light (mainly natural light or light from lighting or an electric light) entering the panel surface 41 of the PDP 4 from the display front plate 30 side is the film 31 bonded to the display front plate 30. Although the light enters the panel surface 41 from the side, reflection to the incident side is suppressed by the AR coating of the film 31. Therefore, PDP4
Panel surface 41 due to the reflection of external light even if the surrounding area is bright.
This makes it possible to prevent the video or image from becoming difficult to see. In addition, a small part of the external light is transmitted to the film 31 and the transparent substrate 2.
1 and the transmitted light is transmitted through the AR / A
Since the reflection and glare are suppressed by the G coating, the visibility and clarity of the image and image on the panel surface 41 can be further prevented from lowering.

In each of the above embodiments, for example, a transparent film having a conductive thin film formed on its surface and having a plurality of holes may be used instead of the shield mesh 15. This conductive thin film is formed by plating a metal such as platinum, gold, silver, copper and palladium, or a conductive metal oxide such as tin oxide and indium oxide by plating, vapor deposition, sputtering or the like, and applying a transparent conductive paint. Method,
It can be formed using various known methods such as a method of forming a layer made of a conductive polymer. In the display front panel of the present invention, the phosphoric acid ester copper compound and the copper compound represented by the above formula (1) are used as the near-infrared light-absorbing component. A light absorbing component may be used.

Further, in the display front plate 30, films 31 and 32 having an AR coating and an AR / AG coating applied to a transparent substrate 21 are bonded to each other. AR coating and AR / AG coating may be provided directly. Further, at least one surface of the transparent substrate 21 may be subjected to a conventional antifouling treatment or hard coating, or a transparent film subjected to such treatment may be bonded. Furthermore, it is also preferable to apply a treatment such as a water-repellent treatment to the surfaces of the glass substrates 11a and 11b constituting the mold 10 that are in contact with the liquid material 14 to promote mold release. The sealing member constituting the mold 10 is a packing 1.
The hard member is not limited to 2 and may be any member as long as the liquid material 14 does not leak to the outside of the mold 10, and the hard member may be joined by an adhesive.

[0035]

EXAMPLES Hereinafter, specific examples according to the present invention will be described, but the present invention is not limited thereto.

Example 1 (1) Preparation of Monomer: 36 g of bis (oxyethyl methacrylate) acid phosphate represented by the following formula (16), and mono (oxyethyl methacrylate) represented by the following formula (17) ) 34 g of acid phosphate, 745 g of methyl methacrylate, and 1.8 g of α-methylstyrene were weighed and mixed in a 2 liter glass beaker. To this mixture was added 30.8 g of copper acetate monohydrate,
The mixture was heated to 60 ° C. and stirred for 2 hours. After completion of the stirring, the copper acetate monohydrate was completely dissolved, and a blue transparent monomer solution was obtained.

[0037]

Embedded image

(2) Assembling of a glass mold (mold) for polymerization and setting of a shield mesh (mesh for electromagnetic wave shielding); dimensions 550 mm × 400 mm × thickness 10
2 mm glass substrates, dimensions 530 mm x 380 mm
(Trade name: Pratt Su-4x-13540, manufactured by Seiren Co., Ltd.) was prepared. A shield mesh is placed on one glass substrate, and then a packing made of soft PVC is placed on the periphery of one glass substrate, and then another glass substrate is placed thereon, and a glass substrate is placed. A peripheral portion where the packing was arranged from both sides was pressed and held by a clamp, and a glass mold (mold) for polymerization as shown in FIG. 1 was assembled.

(3) Forming a resin plate in which a shield mesh is embedded; t is added to the monomer solution prepared in (1) above.
6 g of butyl peroxydecane are added and mixed,
A polymerization monomer solution (liquid material) was prepared. This monomer solution for polymerization was injected into the glass mold for polymerization assembled in the above (2). Then, the polymerization glass mold into which the monomer solution was injected was placed in an oven,
At a constant temperature of 40 ° C for 3 hours.
Time, 100 ° C for 2 hours, 100 ° C to 70 ° C
The liquid material was polymerized and solidified while controlling the temperature so that the temperature was lowered by 2 hours. After the polymerization solidification is completed, take out the glass mold for polymerization from the oven, clamp,
The glass substrate and the packing were removed to obtain a 3 mm-thick resin plate (the display front plate 20 shown in FIG. 2) in which the shield mesh was embedded in the transparent substrate. In this resin plate, a shield mesh is embedded in the vicinity of one surface of the resin plate, and the average distance Dav (m) between one surface of the resin plate described above and the surface of the shield mesh opposed to this one surface.
m) was 0.015 mm.

(4) EMI Measurement: The obtained resin plate was cut into a size of 500 mm × 360 mm, a conductive paste was applied to a mesh portion of the cut end face, and a lead wire was drawn out from the shield mesh. With this lead wire grounded,
When the MI measurement was performed, a maximum of 5
8 dB (corresponding to electric field strength; the same applies hereinafter), frequency 1 GHz
It was confirmed that the sample had an electromagnetic wave shielding performance of up to 60 dB.

(5) Spectral characteristics measurement and moisture resistance test: The spectral characteristics of the resin plate were measured using a spectrophotometer “U-4000”.
It was measured using [manufactured by Hitachi, Ltd.]. FIG. 5 shows the result of the obtained spectral transmittance spectrum (wavelength 250 to 1200 nm). From FIG. 5, it was confirmed that this resin plate had excellent near-infrared light absorption and visible light transmittance.
Further, as a moisture resistance test, the resin plate was heated to an ambient temperature of 60 ° C.
After leaving for 1000 hours in an environment at 90 ° C. and a relative humidity of 90%, the spectral transmittance of the resin plate and the presence or absence of warpage were observed. As a result, no change was observed in the spectral characteristics of the resin plate after the test, and no warpage occurred. From this, it was confirmed that this resin plate was excellent in moisture resistance.

(6) Manufacture of a display front panel; a transparent film (manufactured by NOF Corporation, trade name: AR / AG coating applied to the surface of the above-mentioned resin plate on which the shield mesh is embedded in the vicinity) Rialok 2301
(AR / AG, with an adhesive)) and a film (product name: RIALOK 2201 (AR, with an adhesive) manufactured by NOF Corporation) on the opposite surface of which is coated with an AR coating, respectively, as shown in FIG. A display front plate (display front plate 30 shown in FIG. 4) in which reflection and glare on the surface were suppressed as shown in FIG. 4 was obtained.

Example 2 (1) Preparation of Monomer: 56 g of bis (oxyethyl methacrylate) acid phosphate represented by the above formula (16) and mono (oxyethyl methacrylate) represented by the above formula (17) ) 54 g of acid phosphate, 726 g of methyl methacrylate, and 1.8 g of α-methylstyrene were weighed and mixed in a 2 liter glass beaker. 15 g of cupric hydroxide is added to this mixture,
And stirred for 2 hours. After completion of the stirring, cupric hydroxide was completely dissolved, and a blue transparent monomer solution was obtained.

(2) Molding of resin plate and EMI measurement: A resin plate having a shield mesh embedded therein was molded in the same manner as in Example 1 except that the monomer solution prepared in the above (1) was used. Also in this resin plate, the shield mesh was embedded near one surface of the resin plate, and the above average distance Dav (mm) was 0.03 mm.
When EMI measurement was performed on this resin plate in the same manner as in Example 1, it was confirmed that the resin plate had an electromagnetic wave shielding performance of up to 58 dB at a frequency of 100 MHz and up to 60 dB at a frequency of 1 GHz.

(3) Measurement of Spectral Characteristics, Moisture Resistance Test, and Production of Display Front Plate: Spectral characteristics of the resin plate were measured in the same manner as in Example 1. FIG. 6 shows the results of the obtained spectral transmittance spectrum (wavelength 250 to 1200 nm). From FIG. 6, it was confirmed that this resin plate had excellent near-infrared light absorption and visible light transmittance. Furthermore, as a result of performing the same moisture resistance test as in Example 1, no change was observed in the spectral characteristics of the resin plate after the test, and no warpage occurred. From this, it was confirmed that this resin plate was excellent in moisture resistance. Further, the same AR / AG coating film and AR coating film as used in Example 1 were bonded to both surfaces of the resin plate to obtain a display front plate.

Example 3 (1) Preparation of Monomer: 36 g of bis (oxyethyl methacrylate) acid phosphate represented by the above formula (16) and mono (oxyethyl methacrylate) represented by the above formula (17) ) 34 g of acid phosphate, 745 g of methyl methacrylate, and 1.8 g of α-methylstyrene were weighed and mixed in a 2 liter glass beaker. To this mixture was added 15 g of cupric hydroxide and 100
The mixture was refluxed and dehydrated for 2 hours while heating and stirring at ℃. After a lapse of 2 hours, the cupric hydroxide was completely dissolved, and a blue transparent monomer solution was obtained.

(2) Molding of resin plate and EMI measurement: A resin plate having a shield mesh embedded therein was molded in the same manner as in Example (1) except that the monomer solution prepared in the above (1) was used. . Also in this resin plate, the shield mesh was embedded in the vicinity of one surface of the resin plate, and the above-mentioned average distance Dav (mm) was 0.05 mm. This resin plate was subjected to EMI in the same manner as in Example 1.
When the measurement was performed, the maximum frequency was 58 d at 100 MHz.
B, it was confirmed that the filter had an electromagnetic wave shielding performance of 60 dB at a frequency of 1 GHz.

(4) Measurement of Spectral Characteristics, Moisture Resistance Test, and Production of Display Front Plate: The spectral characteristics of the resin plate were measured in the same manner as in Example 1. The result of the obtained spectral transmittance spectrum (wavelength 250 to 1200 nm) is shown in FIG. From FIG. 7, it was confirmed that this resin molded article had excellent near-infrared light absorption and visible light transmittance. further,
As a result of performing the same moisture resistance test as in Example 1, no change was observed in the spectral characteristics of the resin plate after the test, and no warpage occurred. From this, it was confirmed that this resin plate was excellent in moisture resistance. Further, the same AR / AG coating film and AR coating film as used in Example 1 were bonded to both surfaces of the resin plate to obtain a display front plate.

Example 4 Mono [1- (acetyloxymethyl) represented by the following formulas (18) to (22):
Ethyl] phosphate, bis [1- (acetyloxymethyl) ethyl] phosphate, mono [2- (acetyloxy) propyl] phosphate, bis [2- (acetyloxy) propyl] phosphate and [1- (acetyloxymethyl) ethyl 100 g of a mixture of [2- (acetyloxy) propyl] phosphate, 726 g of methyl methacrylate, and 1.8 g of α-methylstyrene were weighed and mixed in a 2 liter glass beaker. To this mixture, 30.8 g of copper acetate monohydrate was added, heated to 60 ° C., and stirred for 2 hours. After completion of the stirring, the copper acetate monohydrate was completely dissolved, and a blue transparent monomer solution was obtained.

[0050]

Embedded image

(2) Molding of resin plate and EMI measurement: A resin plate having a shield mesh embedded therein was molded in the same manner as in Example 1 except that the monomer solution prepared in the above (1) was used. Also in this resin plate, the shield mesh was embedded in the vicinity of one surface of the resin plate, and the above-mentioned average distance Dav (mm) was 0.05 mm.
When EMI measurement was performed on this resin plate in the same manner as in Example 1, it was confirmed that the resin plate had an electromagnetic wave shielding performance of up to 58 dB at a frequency of 100 MHz and up to 60 dB at a frequency of 1 GHz.

(3) Measurement of Spectral Characteristics, Moisture Resistance Test, and Production of Display Front Plate: The spectral characteristics of the resin plate were measured in the same manner as in Example 1. As a result, this resin plate was excellent in near-infrared light absorption. And it was confirmed to have visible light transmittance. Furthermore, as a result of performing the same moisture resistance test as in Example 1, no change was observed in the spectral characteristics of the resin plate after the test, and no warpage occurred. From this, it was confirmed that this resin plate was excellent in moisture resistance. The same AR / A as used in Example 1 was used on both sides of the resin plate.
The G coating film and the AR coating film were respectively bonded to obtain a display front plate.

Example 5 17.6 g of mono (1-methoxypropyl) phosphate represented by the following formula (23)
And 10.6 g of bis (1-methoxypropyl) phosphate, 714 g of methyl methacrylate, and 1.8 g of α-methylstyrene were weighed and mixed in a 2 liter glass beaker. To this mixture, 25.9 g of copper acetate monohydrate was added, heated to 60 ° C., and stirred for 2 hours. After completion of the stirring, the copper acetate monohydrate was completely dissolved, and a blue transparent monomer solution was obtained.

[0054]

Embedded image

(2) Molding of resin plate and EMI measurement: A resin plate having a shield mesh embedded therein was molded in the same manner as in Example 1 except that the monomer solution prepared in the above (1) was used. Also in this resin plate, the shield mesh was embedded in the vicinity of one surface of the resin plate, and the above-mentioned average distance Dav (mm) was 0.05 mm.
When EMI measurement was performed on this resin plate in the same manner as in Example 1, it was confirmed that the resin plate had an electromagnetic wave shielding performance of up to 58 dB at a frequency of 100 MHz and up to 60 dB at a frequency of 1 GHz.

(3) Measurement of Spectral Characteristics, Moisture Resistance Test, and Production of Display Front Plate: The spectral characteristics of the resin plate were measured in the same manner as in Example 1. As a result, this resin plate was excellent in near-infrared light absorption. And it was confirmed to have visible light transmittance. Furthermore, as a result of performing the same moisture resistance test as in Example 1, no change was observed in the spectral characteristics of the resin plate after the test, and no warpage occurred. From this, it was confirmed that this resin plate was excellent in moisture resistance. The same AR / A as used in Example 1 was used on both sides of the resin plate.
The G coating film and the AR coating film were respectively bonded to obtain a display front plate.

Example 6 (1) Molding of resin plate and EMI measurement: 805 g of methyl methacrylate and 1.8 g of α-methylstyrene were weighed and mixed in a 2 liter glass beaker to obtain a monomer solution. . A resin plate in which a shield mesh was embedded was molded in the same manner as in Example 1 except that this monomer solution was used. Also in this resin plate, the shield mesh was embedded near one surface of the resin plate, and the above-mentioned average distance Dav (mm) was 0.3 mm. Next, when EMI measurement was performed in the same manner as in Example 1, the maximum was 58 dB at a frequency of 100 MHz, and the frequency was 1 GH.
It was confirmed that the filter had an electromagnetic wave shielding performance of 60 dB at maximum in z.

Comparative Example 1 A resin plate was formed in the same manner as in Example (1) except that no shield mesh was embedded. Next, on one side of this resin plate,
The same shield mesh as used in the above was bonded using an adhesive having a thickness of 20 μm. The same AR / AG coating film as used in Example 1 was bonded to this shield mesh bonding surface, and the same surface as that used in Example 1 was used on the opposite surface of the AR / AG film bonding surface. An AR film was bonded to obtain a display front plate. When EMI measurement was performed on this display front plate in the same manner as in Example 1, the maximum was 58 dB at a frequency of 100 MHz.
It was confirmed that it had an electromagnetic wave shielding performance of a maximum of 60 dB at a frequency of 1 GHz.

<Visibility Test> Each display front panel manufactured in each of Examples 1 to 6 and Comparative Example 1 was placed on the front of a PDP as shown in FIG. 3, and the visibility of an image was visually checked. First, the shield mesh side was installed so as to face the panel surface of the PDP. As a result, when the display front plates of Examples 1 to 6 were installed, Comparative Example 1
It was confirmed that the brightness and clarity of the image projected on the panel surface were excellent as compared with the case where the display front plate was installed. Next, the display front plate was turned upside down, and the surface opposite to the surface on the shield mesh side was installed so as to face the panel surface of the PDP. As a result, Examples 1 to
It was confirmed that, when the display front panel of No. 6 was installed, the brightness and clarity of the image were superior to the case where the display front panel of Comparative Example 1 was installed, similarly to the above. Also, before turning over the display front panel of Examples 1 to 6, ie, the surface on the shield mesh side, the PDP was used.
The sharpness of the image was perceived to be higher when the panel was installed so as to face the panel surface. From this, it was confirmed that according to the display front panel of the present invention, the visibility of the image projected on the display was enhanced, and excellent clarity was imparted.

[0060]

As described above, according to the method for manufacturing a display front panel of the present invention, the productivity of a display front panel having an electromagnetic wave shielding property can be improved, and the image and image projected on the display can be improved. It is possible to obtain a display front plate that does not impair visibility and sharpness, and it is possible to sufficiently prevent damage to the display front plate such as peeling of the electromagnetic wave shielding layer. Further, according to the present invention, it is possible to obtain a display front panel in which productivity is improved, the visibility and clarity of an image or image projected on a display are not impaired, and damage is sufficiently prevented. it can.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing a state in which a method of manufacturing a display front panel according to the present invention is being performed.

FIG. 2 is a cross-sectional view showing one embodiment of a display front panel of the present invention.

FIG. 3 is a perspective view showing a use state of the display front panel of the present invention.

FIG. 4 is a cross-sectional view illustrating another embodiment of a display front panel according to the present invention.

FIG. 5 is a graph showing a spectral transmission spectrum of a display front panel of Example 1.

FIG. 6 is a graph showing a spectral transmission spectrum of a display front plate of Example 2.

FIG. 7 is a graph showing a spectral transmission spectrum of a display front plate of Example 3.

[Explanation of symbols]

4 ... PDP (display), 10 ... type, 11a, 11
b: glass substrate (plate), 12: packing (sealing member), 14: liquid material, 15: shield mesh (conductive member), 20, 30: display front plate, 21: transparent substrate.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shoichi Kunii 16 Nishimachi Ochiai, Nishikicho, Iwaki-shi, Fukushima F-term (reference) in Nishiki Plant of Kureha Chemical Industry Co., Ltd. 2H048 CA04 CA09 CA11 CA12 CA13 CA19 CA21 5G435 AA16 BB05 BB06 GG33 KK07

Claims (6)

[Claims] 1. A display front plate comprising: a transparent substrate containing a resin; and a conductive member embedded in the transparent substrate and capable of shielding electromagnetic waves. 2. The method according to claim 1, wherein the transparent substrate is formed of a resin composition containing a phosphate compound represented by the following formula (1), a copper compound, and a resin. Item 2. A display front panel according to Item 1. Embedded image [In the formula (1), R is the following formula (2), (3), (4),
A group represented by (5), (6), (7), (8) or (9), an alkyl group, an aryl group, an aralkyl group, or an alkenyl group, n is 1 or 2, and n is In the case of 1, R may be the same or different. Embedded image (In the formulas (2) to (9), R ^{11 to} R ^{17 each} have 1 to 20 carbon atoms.
Represents an alkyl group, an aryl group having 6 to 20 carbon atoms or an aralkyl group (provided that at least one hydrogen atom bonded to a carbon atom constituting the aromatic ring is substituted by an alkyl group having 1 to 6 carbon atoms or halogen) may be), R ²¹ to R ²⁵ is a hydrogen atom or a carbon atoms represents 1-4 alkyl group (except when R ^23, R ^24, R ²⁵ are all hydrogen atoms), R ³¹ and R ³² represents an alkylene group having 1 to 6 carbon atoms, R ⁴¹ represents an alkylene group having 1 to 10 carbon atoms, R ⁵¹ and R ⁵² represent an alkyl group having 1 to 20 carbon atoms, and R ⁶¹ Represents a hydrogen atom or a methyl group; m represents an integer of 1 to 6; k represents an integer of 0 to 5;
And r represents an integer of 1 to 10. )] 3. The conductive member has a planar shape,
The conductive member is represented by the following formula (10); 0.01 mm ≦ Dav ≦ 0.5 mm Formula (10) [wherein Dav is one surface of the transparent substrate and the surface of the conductive member facing the one surface. And the average distance (mm). 3. The display front panel according to claim 1, wherein the display front panel is embedded in the transparent substrate so as to satisfy the relationship shown in [1]. 4. A display comprising: a conductive member having an electromagnetic wave shielding property; and a liquid material containing a polymerizable resin monomer is injected into the mold, and the liquid material is polymerized and solidified. Manufacturing method of front plate. 5. A resin composition comprising a phosphate compound represented by the formula (1), a copper compound, and a polymerizable resin monomer as the liquid material. Item 5. A method for manufacturing a display front panel according to Item 4. 6. The mold includes at least two opposing plate-like bodies, and a sealing member disposed at a peripheral portion between the plate-like bodies, wherein the conductive member is housed, and The method according to claim 4, wherein the liquid material is polymerized and solidified in a state where the mold into which the liquid material has been injected is held such that the opposed plate-shaped bodies are arranged vertically. Manufacturing method of display front panel.