JPH10187056A - Filter for display device, display device, and front surface plate for display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter for display device with antireflection property and to facilitate the adjustment of light transmittance over a wide range, by providing one end face of a plastic film base material with an antireflection film and the other end face of the base material with a colored tacky adhesive layer. SOLUTION: This filter 1 for display device is constituted by forming the antireflection film 3 on one surface side of the plastic base material 1 and the colored tacky adhesive layer 4 on the outer surface side. The antireflection film 3 is preferably formed to the two-layered structure composed of a light absorption film 3a and a dielectric film 3b. As a result, a high antireflection effect is obtainable with the min. film constitution and the adjustment of the light transmittance is made easy by the combination with the colored tacky adhesive layer 4. The light absorption film 3a may be composed of a metallic film, for which metals, for example, Au, Pt, Pd, Ni-Cr, Al, In2 O3 -SnO2 , Ag, CuI, CuS, Cr and Cu, may be exemplified. If the light absorption film 3a is composed of the metallic film, the light absorption film 3a functions as a conductive film as well.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter for a display device in the form of an adhesive film having antireflection properties and capable of adjusting the amount of transmitted light, a display device having the filter, and a front panel for the display device. About.

[0002]

2. Description of the Related Art When an object is viewed through a transparent material, it is troublesome that the reflected light is strong and the reflected image is clear. For example, in a spectacle lens, a reflected image called a ghost or a flare is generated. It may cause discomfort to the eyes. Further, in the case of a looking glass or the like, there is a problem that the contents are not clear due to the reflected light on the glass surface.

Conventionally, a method of coating a substance having a refractive index different from that of a substrate on a substrate by a vacuum deposition method or the like to prevent reflection has been performed. In this case, it is known that the selection of the thickness of the substance that coats the substrate is important in order to maximize the antireflection effect.

For example, in the case of a single-layer film, it is necessary to select a substance having a lower refractive index than that of the substrate to have an optical film thickness of １ ／ or an odd multiple of the light wavelength for which the optical film has a minimum reflectance, that is, a maximum transmission. It is known to give rates.

Here, the optical film thickness is given by the product of the refractive index of the film forming material and the film thickness of the film. Further, a multilayer antireflection film can be formed, and some proposals have been made on the selection of the film thickness in this case (Optical Technology Contact Vol. 9, No. 8, page 17 (1971)).

[0006] These antireflection films are mainly formed of an inorganic oxide or an inorganic halide, and generally have a low reflectance and a high transmittance in a visible light region.

[0007] On the panel surface of the display device, there are cases where external light or illumination light is reflected in the screen and the image becomes difficult to see. In order to suppress such surface reflection, an antireflection film is provided on the panel surface. Often.

On the other hand, in the display device, it is necessary to adjust the transmittance of the display panel in a wide range (20% to 97%) in order to improve the contrast, for example, depending on the structure and use thereof. On the panel glass of a CRT or the acrylic front panel of a transmission type projector (rear projector), the transmittance is adjusted by changing the transmittance of the panel itself.

However, the display panel has a role of maintaining the mechanical strength of the display device. In the method of changing the transmittance of the display device itself, the display panel becomes thicker due to an increase in the size of the display device. In this case, it is necessary to easily change the transmittance of the panel material itself, for example, by changing the degree of dyeing or the concentration of the pigment. Furthermore, in the panel glass of CRT,
Because of the mechanical strength, the thickness is thin at the center and thick at the edges, and the current method of adjusting the transmittance by the panel glass itself has a problem that the transmittance differs between the center and the edge.

Therefore, it is convenient if the transmittance of the display device can be adjusted using a filter different from the display device.

Some of the heat ray blocking films, which are filters using an optical thin film, can adjust the transmittance of an absorption film formed by using a metal thin film. The visible light transmittance of these forms is preferably 60 to 90%.

As an anti-reflection film, there is a filter designed to incorporate an absorption film, and there is a structure called a dark mirror, a selective absorption mirror, or an enhanced absorption mirror. As the anti-reflection film for visible light, a configuration called a dark mirror can be used.
(P160, Nikkan Kogyo Shimbun) proposes a two-layer dark mirror combining an absorption film and a dielectric film.

However, these antireflection films have a high antireflection function in a wide range of visible light region, which cannot be easily obtained with a multilayer structure using only a transparent dielectric film.
Although it can be realized with the smallest film configuration, there is a restriction that the thickness of the absorbing film must exactly match the film thickness, for example, １ ／ of the light wavelength, as described above. Since the refractive index of a material is greatly restricted by the design of the antireflection film, its transmittance is limited to a certain narrow range determined by the material that can be used as the absorbing film, and it is not possible to adjust the transmittance over a wide range. Can not.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a filter for a display device having an antireflection property and capable of easily adjusting the light transmittance in a wide range, and a display device having the filter. It is an object of the present invention to provide a front panel for a display device.

[0015]

The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have reached the present invention described below. That is, the present invention has the following configurations.

That is, in order to achieve the above object, a filter for a display device of the present invention comprises a plastic film substrate, an antireflection film provided on one side of the plastic film substrate, and a plastic film substrate. And a colored pressure-sensitive adhesive layer provided on the other side.

The filter for a display device of the present invention is of an adhesive film type, and can be easily disposed on a panel surface or a front plate of the display device by an adhesive layer formed on a plastic film substrate. Can be. The pressure-sensitive adhesive layer is colored, and an antireflection film is formed on the surface of the plastic film substrate opposite to the surface on which the pressure-sensitive adhesive layer is formed.

Therefore, the filter of the present invention has an antireflection property, and the light transmittance can be easily adjusted by the coloring degree and thickness of the pressure-sensitive adhesive layer. That is, the light transmittance can be adjusted by using a colored plastic film substrate. However, in order to cope with a wide range of light transmittance, for example, types of transmittance such as 12%, 25%, and 46% are used. Although there is a problem that the material cost is high because various types of plastic film base materials must be prepared, the method of coloring the adhesive layer requires one transparent plastic film.
It is possible to arbitrarily adjust the degree of coloring and the thickness of the pressure-sensitive adhesive layer when forming the pressure-sensitive adhesive layer by preparing only the types, which is advantageous in cost.

Further, by forming the anti-reflection film into a layer structure of two or more layers having a light-absorbing film, the light-absorbing film can form an effective anti-reflection film. A large anti-reflection effect is obtained with the configuration of, and in combination with the light absorbing film and the colored adhesive layer,
It is possible to adjust the light transmittance in a wide range.

Such a filter for a display device can be easily attached to a panel surface of a display device or a front plate for a display device through an adhesive layer, and the display surface has low reflection and light transmittance. An adjusted display device and front panel can be obtained.

Therefore, since the light transmittance is adjusted by a filter separate from the display device, only one type of panel material having a high transmittance is required for the display device, so that the cost can be reduced. Further, even when the thicknesses of the central portion and the end portion are different from each other as in the case of a CRT panel, the transmittance is not adjusted by the panel itself, so that the light transmittance is made uniform over the entire panel surface.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be specifically described, but the present invention is not limited to the following embodiments.

FIG. 1 is a sectional view showing one embodiment of a filter for a display device according to the present invention. The display device filter 1 has an antireflection film 3 formed on one surface of a plastic film substrate 2 and a colored adhesive layer 4 formed on the other surface.

As the plastic film substrate 1, any material may be used as long as it is a substrate made of an organic polymer. Optical characteristics such as transparency, refractive index and dispersion, impact resistance and heat resistance are also used. In view of various properties such as durability, etc., in particular, (meth) acrylic resins such as polymethyl methacrylate, copolymers of methyl methacrylate with other alkyl (meth) acrylates, vinyl monomers such as styrene; polycarbonate, Polycarbonate resins such as diethylene glycol bisallyl carbonate (CR-39); homopolymers or copolymers of (brominated) bisphenol A type di (meth) acrylate,
(Brominated) thermosetting (meth) acrylic resins such as polymers and copolymers of urethane-modified monomers of mono (meth) acrylate of bisphenol A; polyesters, especially polyethylene terephthalate, polyethylene naphthalate and unsaturated polyester; acrylonitrile -Styrene copolymers, polyvinyl chloride, polyurethane, epoxy resins and the like are preferred. It is also possible to use an aramid resin in consideration of heat resistance.

The plastic film substrate 2 can be obtained by a method such as stretching these resins or diluting them in a solvent, forming a film, and drying the resin.
About 500 μm.

The surface of the plastic substrate 2 as described above may be covered with a coating material such as a hard coat. Various physical properties such as adhesion, hardness, chemical resistance, durability, and dyeability can be improved.

In order to improve the hardness, it is possible to use a material to which various materials conventionally known as a plastic surface hardening film are applied, for example, Japanese Patent Publication No. 50-28092.
Gazette, Japanese Patent Publication No. 50-28446, Japanese Patent Publication No. 51-
24368, JP-A-52-112698,
The technology disclosed in Japanese Patent Publication No. 57-2735 can be applied. Further, an acrylic cross-linked product using a (meth) acrylic acid ester and a cross-linking agent such as pentaerythritol, or an organopolysiloxane-based product may be used. These can be used alone or in appropriate combination. The thickness of the hard coat is usually about 3 to 10 μm.

As shown in FIG. 1, the antireflection film preferably has a two-layer structure of a light absorption film 3a and a dielectric film 3b. Thereby, a large anti-reflection effect can be obtained with the minimum film configuration, and the light transmittance can be easily adjusted by combination with the colored pressure-sensitive adhesive layer. However, needless to say, a film configuration of three or more layers may be used.

The light absorbing film 3a can be composed of a metal film, for example, Au, Pt, Pd, Ni-Cr, Al, A
g, In ₂ O ₃ —SnO ₂ , CuI, CuS, Cr, C
u or the like, and one or a combination of two or more of these metals may be used, for example, a vapor deposition method, a CVD method, or the like.
It can be obtained by forming a film by a sputtering method, a sputtering method or the like. The film thickness is preferably selected to be 1/4 or an odd multiple of the light wavelength in order to obtain a low reflectance as an optical film thickness, but the thickness is usually about 1 to 500 nm.

The light absorbing film 3a functions as an antireflection film and also has a light absorbing property. The light transmittance of the absorbing film is usually in the range of 60 to 98% at a wavelength of 546 nm due to the limitation of the film thickness.

When the light absorbing film 3a is composed of a metal film, the light absorbing film 3a also functions as a conductive film. In recent years, in a display device such as a display for a computer, a distance between an operator and the display device may be short, and a VLF band (2 to 400 kHz) and an ELF band (5 to 2 kHz) coming out of the display device may be used.
000 Hz) on the human body. For such a leakage electromagnetic field, a standard called MPR-II and a guideline called TCO have been established mainly in Europe, and the needs of products corresponding to these standards are increasing. The electromagnetic field from these display devices can be reduced to some extent by a method such as a circuit canceling method or the provision of an appropriate shield plate.However, with respect to the display surface, a conductive film is provided and the conductive film is grounded to the display device. Dropping is one of the most effective methods (Technical Report of the Institute of Television Engineers of Japan, Vol. 1, No. 2, '95 .1). Therefore, by connecting the light absorbing film 3a to the ground, the influence of such an electromagnetic field on the human body can be reduced.

The dielectric film 3b can be composed of an inorganic substance such as an inorganic oxide or a halogen compound, and for example, silicon dioxide can be exemplified. Various inorganic materials including silicon dioxide can be formed into films by various methods such as PVD (Physical Vapor Deposition) represented by vacuum deposition, ion plating, and sputtering, as well as spraying (for leak electric field). Low-reflection coating ”Technical Report of the Institute of Television Engineers of Japan, VOL.10, No.2, '95 .1), immersion method,
There are a CVD method, a coating method and the like.

[0033] In order to obtain a dielectric film 3b, as the inorganic substance suitable for the PVD method described above, in addition to SiO _2, for example, A
l ₂ O ₃ , ZrO ₂ , TiO ₂ , Ta ₂
O ₅ , TaHf ₂ , SiO, TiO, Ti ₂ O ₃
, HfO ₂ , ZnO, In ₂ O ₃ / SnO _{2
, Y 2 O 3, Yb 2} O 3, Sb 2 O 3,
Examples thereof include inorganic oxides such as MgO and CeO ₂ . The antireflection film formed by such a PVD method can have a layer structure of two or more layers including the light absorption film. In this case, the outermost surface layer film is mainly formed of silicon dioxide. Preferably, it is In cases other than silicon dioxide, sufficient surface hardness may not be obtained.

The thickness of the dielectric film is to be determined according to the required performance other than the antireflection effect. However, in order to maximize the antireflection effect, the optical film of the surface film is required. It is preferable to select the film thickness to be １ ／ of the target light wavelength or an odd multiple thereof, from the viewpoint of giving a minimum reflectance, that is, a maximum transmittance. Its thickness is generally about 10 to 200 nm.

Incidentally, it is of course possible to form an antifouling film or another film on the antireflection film 3.

As the pressure-sensitive adhesive which is the main component of the colored pressure-sensitive adhesive layer 2, any material can be used as long as it can be adhered only by applying pressure at room temperature for a short time without using water, a solvent, heat or the like. However, for example, natural rubber, IR, SBR, NBR
Various adhesives such as rubber-based, acrylic-based, and silicone-based adhesives, and those obtained by adding an ultraviolet crosslinking agent to these substances can be used. Since the adhesive is not removed again after being attached to the display device, an acrylic adhesive having a high degree of crosslinking and for permanent adhesion is suitable as the adhesive. In addition, an adhesive that functions as an adhesive after sticking may be used.

In the present invention, a coloring agent is mixed with the adhesive to form a colored adhesive layer, and the light transmittance is adjusted. Examples of the colorant include dyes and pigments such as carbon black. However, dyes are preferably used from the viewpoints of transmittance stability, uniformity, durability, and the like. The type of color is usually black to gray, and two or more dyes may be mixed to give a black color. Further, colors other than black may be used.

The colored pressure-sensitive adhesive layer 4 has a haze value of 20% so as not to deteriorate the quality of displayed characters and figures.
The one having a low haze of preferably 5% or less is preferable. The absorptance is 95% or less at a wavelength of 546 nm, particularly 40%.
A range of ~ 90% is preferred. Since the product of the light transmittance of the colored pressure-sensitive adhesive layer 4 and the light transmittance of the light absorbing film 3a substantially determines the light transmittance of the filter, the light transmittance of the light absorbing film is adjusted to a desired light transmittance. Both the transmittance and the light transmittance of the pressure-sensitive adhesive layer are taken into consideration. For example, the light transmittance of the absorbing film is 60 to 98%,
When the light transmittance of the pressure-sensitive adhesive layer is 40 to 95%, the light transmittance of the whole filter is about 24 to 93%, and the light transmittance can be adjusted in a wide range.

The pressure-sensitive adhesive layer 4 can be formed by forming a film of a pressure-sensitive adhesive dissolved in a solvent on the plastic film substrate 2 by a method such as doctor coating, gravure printing, or brush coating, and then drying the film, or a hot melt coater. It can be performed by a method such as a method of applying with a liquid. The thickness of the pressure-sensitive adhesive layer 4 is usually about 20 to 200 μm. Usually, the surface of the pressure-sensitive adhesive layer 4 is covered with a release film during storage, and the release film is peeled off and adhered to an adherend when attached to a display device or the like.

Since the filter 1 for a display device of the present invention has an antireflection property and can adjust the light transmittance in a wide range, the filter 1 is adhered to the display surface of the display device using an adhesive layer, and the reflection is performed. It is possible to easily manufacture a display device with reduced light transmittance and adjusted light transmittance. The target display device includes a panel of a display device such as a CRT, a liquid crystal display device, or a plasma display, and a panel of various display devices. In addition, a front panel of a transmission type projector or a CRT is also included.

When the display device filter 1 according to the present invention is attached to a display device, for example, as shown in FIG.
Peeling off the release film at one end of the display device filter 1 having a predetermined size on the panel surface of the display device,
After the exposed pressure-sensitive adhesive layer 4 is attached to one end of the panel surface, the filter is attached to the other end of the panel by applying pressure with, for example, a rubber roller while sequentially peeling the release film, and attaching the filter to the other end of the panel. Can be attached to

FIG. 3 shows a structure in which the display device filter 1 is attached to the panel surface of the CRT. In this structure, an example is shown in which the light absorbing film 3a also serves as a conductive film and can cancel the leakage electromagnetic field.

Such a color cathode ray tube (CRT) 10
The panel 21, the funnel 22, and the neck tube 23 constitute a vacuum container, and the panel 21 and the funnel 22
Bonded by frit glass. A tension band 29 for explosion proof is wound around the outer periphery of the panel 21. The tension band 29 is made of a conductive material such as a metal, and is grounded through a ground wire 30.

On the inner surface of the panel 21, a phosphor screen 26 coated with blue, green and red light emitting phosphors is formed, and a color selection mask 25 is arranged close to the phosphor screen 26. The color selection mask 25 is held by a mask holding frame,
A magnetic shield 27 is mounted on the electron gun side.

The electron beam 28 from the electron gun 24 accommodated in the neck 23 passes through the color selection mask 25 and reaches the phosphor screen 26 formed on the inner surface of the panel, and excites a predetermined phosphor to emit light.

The display device filter 1 is adhered to the surface of the panel 21 with the colored adhesive 4, and the conductive film (light absorbing film) of the display device filter 1 is made conductive by a method not shown in FIG. The conductive tape 31 is connected to the tension band 29. Therefore, the conductive film of the display device filter 1 is grounded via the conductive tape 31 and the tension band 29.

In such a CRT 10, the light transmittance is adjusted by the display device filter 1, the contrast is improved, and the reflection of external light or illumination light reflected on the screen to make the image difficult to see is prevented. High quality display is obtained. In addition, the leakage electromagnetic field can be canceled, and the effect of the electromagnetic field on the human body can be prevented. Further, it is not necessary to adjust the light transmittance of the display panel 21 of the display device, and it is sufficient to prepare one kind of transparent panel, and the light transmittance can be adjusted by retrofitting, and the panel having the changed light transmittance can be used. Since it does not have to be easy, the cost can be reduced. Therefore, as a display panel glass, for example, the spectral transmittance at a wavelength of 546 nm with respect to a glass thickness of 10.16 mm such as clear, gray, tint or the like is 50% or more (EIAJ-ED-21).
38) It is preferable to use those.

FIG. 4 shows a configuration of a structure in which a filter for a display device is provided on a panel surface of a front plate of a transmission type projector or a CRT. The front plate 20 has a structure in which a plastic film base 2 having an antireflection film 3 formed on a transparent panel 11 made of an acrylic plate or the like via an adhesive layer 4 is adhered.

The transmittance of the front panel 10 is adjusted by the display device filter 1, the contrast is improved, and the reflection of external light or illumination light reflected on the screen to make the image difficult to see is prevented. , High quality display is obtained.
Further, since there is no need to adjust the light transmittance of the acrylic plate, it is not necessary to prepare several types of acrylic plates having different light transmittances, and the cost can be reduced.

[0050]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

Example 1 (1) Preparation of Antireflection Film A transparent polyethylene terephthalate (PET) film having a thickness of 100 μm was used as a plastic film substrate. One surface of the PET film is previously subjected to a hard coat treatment for ensuring surface hardness.

The hard coat treatment referred to herein is generally a method of applying an acrylic cross-linkable resin material and cross-linking and curing it with ultraviolet rays or an electron beam, or applying a silicon, melamine or epoxy resin material. , Heat curing or the like.

A 3 nm-thick metal Cr (chromium), which is a light absorbing film, is pre-sputtered by sputtering as an anti-reflection film, and SiO ₂ is further sputtered to a thickness of 75 nm as a dielectric film thereon. Formed.

According to a computer simulation, the anti-reflection film composed of the light absorbing film and the dielectric film has reflection and transmission characteristics on the coated surface as shown in FIGS. 5 and 6, respectively. Is 60%.

(2) Application of pressure-sensitive adhesive An acrylic pressure-sensitive adhesive adjusted to have a transmittance of 80% by adding a black dye is dissolved in a solvent and applied to the other surface of the plastic film substrate. The coating was uniformly applied on one surface with a thickness of 50 ± 2 microns. Thereafter, drying was performed at 60 ° C. to form a pressure-sensitive adhesive having a predetermined adhesive strength.

(3) Lamination Clear glass panel for CRT polished as usual (EIAJ
After assembling as a CRT using H-8601), the above film was adhered to the display surface from one end while applying pressure with a rubber roller to have antireflection properties and a transmittance of 45.8.
% CRT display device was obtained.

(4) Performance Evaluation The transmittance in this case was calculated as follows.

(Transmittance by antireflection film: 60%) × (Transmittance by adhesive: 80%) × (Transmittance decrease by reflection of 4.5% on back surface of glass panel: 95.5%) = 45.8.
%.

In this calculation, the reflection at the boundary between the film and the pressure-sensitive adhesive and between the pressure-sensitive adhesive and the glass panel was considered to be negligible because the difference in refractive index between the two was small.

As a result, the transmittance difference between the center and the end of the display surface (for example, EIAJ H-4601), which cannot be avoided in mechanical strength in a CRT in which transmittance is adjusted by a conventional glass panel.
In glass type 28 CRT, the difference in glass thickness is about 2m
m and a transmittance difference of about 10%), and a CRT device of excellent quality can be obtained.

Further, a glass panel material having a large volume is
For example, since it can be unified to clear glass, it can contribute to cost reduction.

Example 2 (1) Preparation of Antireflection Film As in Example 1, a 100 μm thick polyethylene terephthalate (PET) film with a hard coat was used as a plastic film substrate.

A 6 nm-thick metal Au (gold) which is a light absorbing film is formed thereon by a sputtering method as an anti-reflection film.
Was pre-sputtered, and SiO ₂ was formed thereon as a dielectric film by sputtering with a thickness of 63 nm.

According to a computer simulation, the antireflection film has reflection and transmission characteristics on the coated surface as shown in FIGS. 7 and 8, respectively. The transmittance at a wavelength of 546 nm is 95%.

(2) Application of pressure-sensitive adhesive On the other surface of the plastic film substrate, an acrylic pressure-sensitive adhesive adjusted to have an absorption rate of 90% by adding a black dye is dissolved in a solvent and applied. The coating was uniformly applied on one surface with a thickness of 50 ± 2 microns. Thereafter, drying was performed at 60 ° C. to form a pressure-sensitive adhesive having a predetermined adhesive strength.

(3) Lamination A transparent acrylic plate was used as a front plate of a rear projection television (transmission type projection television), and the film was adhered to the display surface from one end while applying pressure with a rubber roller to reflect light. It has a protective property and a transmittance of 82.
A display device adjusted to 4% was obtained.

(4) Performance Evaluation The transmittance in this case was calculated as follows.

(Transmittance by antireflection film: 95%) × (Transmittance by adhesive: 90%) × (Transmissivity decrease by reflection of 3.6% on back surface of acrylic plate: 96.4%) = 82.4
%.

In this calculation, the reflection at the boundary between the film and the pressure-sensitive adhesive and between the pressure-sensitive adhesive and the acrylic plate was considered to be negligible because the difference in refractive index between the two was small.

Thus, in a projection television in which the transmittance is adjusted by the conventional acrylic front panel, the thickness of the front panel varies depending on the size of the device due to its mechanical strength and the limit of image brightness. Although it was necessary to prepare a plate in which the transmittance of the plate was changed according to the size, the acrylic material having a large volume can be unified into, for example, a highly transparent type, which can contribute to cost reduction.

[0071]

According to the filter for a display device, the display device and the front plate for a display device of the present invention, the transmittance can be adjusted by using an antireflection film, particularly an antireflection film having a light absorbing film and a colored adhesive layer. Has the following effects.

(1) A high antireflection function can be realized with a minimum number of layers.

(2) The transmittance of a wide range can be adjusted without changing the material of the display panel. In particular, in a CRT, the difference in transmittance between the center and the end of the display surface is eliminated, and the display quality is improved.

(3) The material of the display panel can be unified into one type, and industrial advantages such as manufacturing cost are great.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating one embodiment of a configuration of a display device filter of the present invention.

FIG. 2 is a schematic diagram illustrating a method of attaching a display device filter of the present invention to a CRT.

FIG. 3 is a sectional view of a CRT in which a display device filter of the present invention is adhered to a panel surface.

FIG. 4 is a cross-sectional view showing a state in which one embodiment of a filter for a display device of the present invention is attached to a front plate for a display device.

FIG. 5 is a graph showing the reflectance of the display device filter obtained in Example 1.

FIG. 6 is a graph showing the transmittance of the display device filter obtained in Example 1.

FIG. 7 is a graph showing the reflectance of the display device filter obtained in Example 2.

FIG. 8 is a graph showing the transmittance of the display device filter obtained in Example 2.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Filter for display devices, 2 ... Plastic film base material, 3 ... Anti-reflection film, 3a ... Light absorption film, 3b ... Dielectric film, 4 ... Colored adhesive layer

Claims (7)

[Claims] 1. A plastic film substrate comprising: a plastic film substrate; an antireflection film provided on one surface of the plastic film substrate; and a colored adhesive layer provided on the other surface of the plastic film substrate. Features Filters for display devices. 2. The filter for a display device according to claim 1, wherein the antireflection film has two or more layers including a light absorbing film. 3. The display device filter according to claim 2, wherein the light absorbing film is made of a metal. 4. The filter for a display device according to claim 3, wherein the light absorbing film also serves as a conductive film. 5. An anti-reflection film comprising a light absorption film and a dielectric film.
3. The filter for a display device according to claim 2, which has a layer structure. 6. A display device wherein a plastic film substrate having an antireflection film is adhered to a panel surface via a colored adhesive layer. 7. A front plate for a display device, wherein a plastic film substrate having an antireflection film is adhered via a colored adhesive layer.