WO2007029649A1 - Filter for display device - Google Patents

Abstract

A filter for a display device is provided with a transparent supporting body, and a selective transmitting layer arranged at least on one plane of the transparent supporting body. The selective transmitting layer has at least one minimum transmittance in each of wavelength ranges of 480nm-530nm and 570nm-600nm, and at least one maximum transmittance in a wavelength range of 530nm-570nm. The maximum transmittance is within a range of 65%-99% and a half-value width of a peak including the maximum transmittance is within a range of 10nm-50nm.

Description

 Specification

 Filter for display device

 Technical field

 [0001] The present invention relates to a filter for a display device and a screen for the display device.

 Background art

 [0002] In recent years, display devices for televisions and personal computers have been flattened and thinned. In these flat display devices such as a plasma display, the contrast is generally worse in a bright place where there is external light due to room lighting or the like than in a dark place. This is because external light is reflected on the display surface due to external light from lighting, etc., and this influence increases the brightness of the black part of the display image and lowers the contrast. For example, in the case of a plasma display, the phosphor on the display surface reflects external light, and light unnecessary for light emission from the phosphor as a display image is mixed to reduce color purity.

 [0003] In order to improve contrast in bright places, there is a method to reduce the visible light transmittance by using a front filter having a certain transmittance and reduce the transmitted light such as external light reflection in the phosphor. (For example, see Patent Document 1.) o This principle will be described with reference to FIG. FIG. 12 is a side sectional view showing a state in which Tint glass is mounted on a plasma display panel as a conventional front filter. Tint glass has a certain transmittance over the entire visible light region. For example, if there is Tint glass 60 with a transmittance of 50% here, the display light 31B (blue), 31G (green), 31R (red) (with intensity L) from the plasma display panel 62 is Tint glass. Through 60, display light 32B, 32G, 32R with an intensity ratio of 50% is obtained. On the other hand, assuming that the external light 3 3 (intensity is R) is totally reflected on the phosphor surface, the reflected light 34 passes through the Tint glass 60 and reaches the phosphor surface, and is reflected and reflected again. Passing through the backside force, it is visible to the observer. As a result, the reflected light 34 has an intensity ratio of 25% (50% × 50%) with respect to the original outside light 33. As shown in the following formula (1), the contrast (LZR) in the light place is double that of the Tint glass 60 without the Tint glass 60, but the transmittance of the entire visible light region is lowered. In addition, the light emission brightness and the sharpness of the image are reduced.

[0004] 0.5L / 0.25R = 2L / R (1) Patent Document 1: Japanese Patent Application Laid-Open No. 01-307797

 Disclosure of the invention

 Problems to be solved by the invention

[0006] The present invention has been made in view of the above-mentioned problems of the prior art. As a front filter for a flat display device such as a plasma display, the present invention is based on indoor lighting that impairs the original light emission of a display image. The object is to provide good contrast, light emission luminance, color purity, and image clarity even in the presence of external light.

 Means for solving the problem

[0007] A filter for a display device according to the present invention comprises a transparent support,

 A selectively permeable layer provided on at least one surface of the transparent support;

 With

 The selective transmission layer has at least one minimum transmittance in a wavelength range of 480 nm to 530 nm and a wavelength range of 570 nm to 600 nm, and at least one maximum transmittance in a wavelength range of 530 nm to 570 nm. And the maximum value of the transmittance is in the range of S65% to 99%, and the half width of the peak including the maximum value of the transmittance is in the range of 10 nm to 50 nm. And

 [0008] The minimum value of the transmittance is preferably in the range of 0.01% to 30%.

 [0009] Further, the selective transmission layer further has at least one maximum value of transmittance in a wavelength range of 400 nm to 480 nm and a wavelength range of 600 nm to 650 nm, respectively, It is preferable that the value is in the range of 65% to 99%, and the difference between the maximum value and the minimum value in each maximum value of the transmittance is in the range of 10%.

 [0010] The selective transmission layer may have a single-layer structure including two or more kinds of organic dyes or derivatives of organic dyes.

 [0011] Further, the selective transmission layer may have a sub-structure divided in units of pixels of red (R), green (G), and blue (B). In this case, each of the substructures of R, G, and B may contain two or more kinds of organic dyes or organic dye derivatives.

[0012] Still further, the selective transmission layer is characterized in that at least one derivative of the organic dye is immobilized in a non-associated state. [0013] The selective transmission layer has a wavelength of 480ηπ! ~ 530nm range, or wavelength 570ηπ! It is characterized by containing an organic dye or a derivative of an organic dye having at least one minimum value of transmittance in at least one of the range of ˜6 OOnm.

 [0014] The derivative of the organic dye may have at least one substituent that is sterically hindered in a bonded state. The derivative of the organic dye may have a dendrimer structure with the organic dye as a nucleus. Furthermore, the derivative of the organic dye may have a structure in which the organic dye is introduced into the side chain of the linear polymer compound. Alternatively, the organic dye derivative may have a structure in which a C to C alkyl group is introduced into the organic dye.

 10 18

 [0015] Further, the permselective layer may contain perylene and copper phthalocyanine as organic dyes.

 [0016] The selective transmission layer further has a wavelength of 850ηπ! ~ L It may have lOOnm infrared absorption function. Furthermore, the selective transmission layer further has a wavelength of 200ηπ! It may have an ultraviolet absorption function of up to 380 nm.

 [0017] Furthermore, an antireflection layer may be further provided on the surface on the viewer side. Further, an antiglare layer may be further provided on the surface on the viewer side.

[0018] The display device filter according to the present invention can be used in various display devices, for example, a transmissive projection screen capable of color display. This transmission type projection screen has the display device filter on the viewer side surface,

 A lenticular lens sheet and a Fresnel lens sheet are provided on opposite surfaces.

 Furthermore, the display device filter according to the present invention can be used in a reflection type projection screen dedicated to a laser projector capable of color display. The reflective projection screen dedicated to this laser projector has the display device filter on the viewer side,

 A reflective film on the opposite surface;

 Is provided.

Furthermore, the display device filter according to the present invention can be used for an EL display capable of color display. This EL display uses the display device filter as an observer. Prepare on the side surface.

 BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, a filter for a display device and a screen according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the drawings, substantially the same members are denoted by the same reference numerals.

 [0022] (Embodiment 1)

 A display device according to Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a side sectional view showing a state where the selective transmission filter 10 of the present invention is mounted on the front surface of the plasma display panel 20. The selective transmission filter 10 is a structure in which a selective transmission layer 12 is formed on a filter substrate 11 and is fixed to the front surface of the plasma display panel 20 via an adhesive layer 13. Further, an antireflection layer 14 may be provided on the forefront.

[0023] The structure of the plasma display panel 20 is such that, for example, a plurality of rows of striped transparent display electrodes 22 are formed on a transparent front substrate 21 such as a glass substrate, and a scan electrode and a sustain electrode are paired. Furthermore, a front dielectric layer 23 is formed so as to cover these display electrode groups. Further, a protective layer may be provided on the front dielectric layer 23 (omitted in FIG. 1). In addition, on the rear substrate 28 arranged to face the front substrate 21, stripe-shaped address electrodes 27 are formed so as to be orthogonal to the display electrodes 22, and so as to cover these address electrodes 27. Thus, the dielectric layer 26 is formed. Further, on the dielectric layer 26, a plurality of stripe barrier ribs 25 are provided in parallel with the address electrodes 27, and a phosphor layer 24 is provided on a side surface between the barrier ribs and on the surface of the dielectric layer 26. . The front substrate 21 and the rear substrate 28 are arranged opposite each other with a minute discharge space so that the display electrode 22 and the address electrode 27 are orthogonal to each other, and helium, neon, argon, and xenon are included in the discharge space. Of these, one or more kinds of mixtures are filled as a discharge gas, and the periphery is sealed. The discharge space is partitioned into a plurality of stripe-shaped sections by the partition walls 25, and discharge cells are formed at the intersections of the display electrodes 22 and the address electrodes 27. In each discharge cell, R, G, and B phosphor layers 24 are formed in different colors. In the plasma display panel 20 having such a configuration, a write pulse is applied between the scan electrode (shown as the display electrode 22 in FIG. 1) and the address electrode 27 according to desired display data. By applying an address discharge between the two electrodes and selecting a discharge cell, a periodic sustaining pulse that is alternately inverted is applied between the scan electrode and the sustain electrode, so that Sustain discharge is performed. Electrons ionized by this discharge collide with discharge gas atoms and are excited to emit light. The light emission of the discharge gas excites the phosphor in the discharge cell to generate visible light, and a predetermined display is performed.

 Next, each component of the selective transmission filter 10 will be described in detail.

First, the filter substrate 11 will be described. The filter substrate 11 may support the layers formed on the upper and lower sides thereof, and may be made of a material having a high transmittance in the visible light region. The transmittance in the visible light region is preferably 80% or more, and more preferably 85% or more. Furthermore, it is preferable that the adhesiveness with each layer formed up and down is excellent. As the filter base 11, an inorganic compound such as glass, a transparent resin sheet, or the like can be used. The glass base material is a force that can be used for various commercially available glass materials such as soda lime glass (blue plate), low expansion glass, non-alkali glass (NA), and quartz glass. It is not something. The thickness can be set as appropriate in consideration of transparency, strength, etc., but is about 0.3mn! About 10 mm is preferable. In addition, as the resin base material, polyesters such as polyethylene terephthalate and polyethylene naphthalate, polystyrene, polyarylate, polycarbonate, polyethylene, polypropylene and other polyolefins, nylon 6 and other polyamides, polyimide and triacetyl cellulose and other cellulose-based resins, Fluorine resins such as polysulfone, polyethersulfone, polyetherketone, polyetherimide, polyoxyethylene, polyurethane, polytetrafluoroethylene, vinyl compounds such as polyvinyl chloride, polyacrylic acid, polyacrylic ester, poly Addition polymer of acrylonitrile, bur compound, polymethacrylic acid, polymethacrylic acid ester, polyvinylidene compound such as polyvinylidene, vinylidene fluoride Z trifluoro Forces including, but are not limited to, vinyl compounds such as tyrene copolymers, ethylene Z butyl acetate copolymers, copolymers of fluorine compounds, polyethers such as polyethylene oxide, epoxy resins, polyvinyl alcohol, polyvinyl butyral, etc. It is not something. These resin sheets may be in the form of a film as long as the main surface is smooth. The thickness can be appropriately set in consideration of permeability, strength, etc. About 00 / zm is preferable. Furthermore, the surface of the filter substrate 11 is preferably subjected to a surface treatment in order to improve the adhesion with each layer. Surface treatment methods include chemical treatment, mechanical treatment, corona discharge treatment, flame treatment, ultraviolet irradiation treatment, high frequency treatment, glow discharge treatment, active plasma treatment, laser treatment, mixed acid treatment, and ozone oxidation treatment. The

 Next, the selective transmission layer 12 will be described. For the selective transmission layer 12, an organic dye (including an organic pigment or an organic dye) or an inorganic pigment having absorption in a specific wavelength region can be used. Further, in the permselective layer 12, at least one kind of organic dye or its derivative is fixed in a state in which the interaction is suppressed as much as possible, that is, in a non-association state. The action of fixing the organic dye derivative in a non-associated state in this way will be described below.

 [0026] In general, an organic dye exhibits a steep absorption spectrum in the liquid phase, but forms an association state due to interaction between molecules in the solid phase, and exhibits a broad absorption spectrum. When this is used for a front filter of a display device, even if the absorption maximum is in the desired wavelength region, the absorption at the bottom of the peak reduces the display light generated by the display device, causing a decrease in luminance. It was. Therefore, the selective transmission layer 12 according to the embodiment of the present invention suppresses the interaction as much as possible by immobilizing in the non-association state, and realizes the selective transmission in the above wavelength range.

 [0027] As a method of realizing the above-mentioned non-association state, there is a method of introducing a substituent that becomes a steric hindrance in the binding state of the organic dye derivative. As a method for introducing a substituent that causes such steric hindrance into a derivative of an organic dye, for example, there is a method of introducing an organic dye into a side chain of a linear polymer compound. In this case, the linear polymer skeleton inhibits the association of dyes, and as a result, a steep absorption spectrum can be maintained.

FIG. 2 is a graph showing an example of a change in absorption spectrum when a substituent causing steric hindrance is introduced into an organic dye derivative. Figure 2 shows the absorption spectrum of rhodamine dye in the film (solid line), the absorption spectrum in solution (broken line), and the absorption spectrum of the film containing dendrimer with rhodamine dye incorporated in the core (dotted line). Are listed for comparison. From Fig. 2, it can be seen that the introduction of the dendrimer structure causes a sharp absorption of the liquid phase. You can see that he keeps the vector.

 [0029] The side chain of the dye is introduced by a synthesis method such as dehydration (such as esterification) or desalting (such as Friedel-Crafts reaction). Another example of the permselective layer 12 is a method of introducing an alkyl group into the skeleton end of an organic dye. In this case, the alkyl group becomes a steric hindrance and inhibits the association of the organic dye, resulting in maintaining a steep absorption spectrum. The alkyl group preferably has a chain length in the range of C to C in view of the effect as a steric hindrance and problems such as film-forming properties. Furthermore, as another example of the selective transmission layer 12, an organic color is used.

10 18

 There is a method of forming a dendrimer structure with a polymer compound using elemental as a core. In this case, the polymer compound becomes a steric hindrance and inhibits association of organic dyes.

 [0030] Next, as an example of a method for synthesizing a dendrimer structure using an organic dye as a nucleus, a method of repeatedly performing an esterification reaction will be described with reference to FIGS. 3 and 4 show the molecular structures of molecular unit A and molecular unit B, which are derivatives of the azobenzene molecule as two kinds of starting materials. In the molecular unit A shown in FIG. 3, a hydrophobic hydrocarbon group is bonded to one branched end and a carboxylic acid group is bonded to the other end. In addition, molecular unit B shown in FIG. 4 has a hydroxyl group at one branched end, but a protective group such as a hydrophobic hydrocarbon group is bonded to the other end. RU A second-generation molecular unit consisting of two molecular units A and one molecular unit B as shown in Fig. 5 by esterification with the carboxylic acid group of molecular unit A and the hydroxyl group of molecular unit B Produces. Next, a deprotection reaction generates a carboxylic acid group on the molecular unit B side as shown in FIG. 6 (third generation molecular unit). By repeating the basic reaction between each generation molecular unit and molecular unit B in this way, a high-generation dendrimer structure is formed. The dendrimer structure in the present invention includes all structures having a structure in which at least one or more repeating unit units are repeated at least two or more stages, as in the above-described example. Further, the external shape may be various shapes as shown in (b) or (c) with respect to the core shown in (a) of FIG. Note that the synthesis method is not limited to the above-described example.

[0031] Examples of the organic dye used in the selective transmission layer 12 include polycyclic aromatic hydrocarbon compounds such as naphthalene, perylene, rubrene, anthracene, pyrene, naphthacene, and derivatives thereof. And heteroaromatic compounds such as coumarin, quinoline, oxadiazole, oral fin, Nile red, 4H-bila-lidene propanedi-tolyl, phenoxazone, quinacridone, and derivatives thereof, polymethines such as cyanine, oxol, azulenium, pyrylium, etc. Compounds, styryl compounds such as bis (diphenyl) biphenyl, borphyrin compounds such as chlorophyll, chelate metal complexes, chelate lanthanide complexes, phenolphthalein, malachite green, fluorescein, rhodamine B, rhodamine 6G, etc. Xanthene compounds, diketopyrrolopyrrole compounds, anthraquinone compounds, benzoquinone compounds, naphthoquinone compounds, benzidine compounds, bisazo compounds, phthalocyanine compounds, naphthalocyanine compounds , Dioxazine compounds, perylene compounds, irgazine compounds, triarylmethane compounds, indigo compounds, styryl compounds, spiropyran compounds, spiroxazine compounds, scyllium compounds, chrome compounds, and derivatives thereof. It is not limited to these. Furthermore, additives such as a binder resin and a dispersant may be mixed as necessary, such as chromaticity adjustment and viscosity adjustment.

 On the other hand, as the inorganic pigment used in the selective transmission layer 12, oxide pigments, hydroxide pigments, sulfide pigments, silicate pigments, phosphate pigments, carbonate pigments, metals It may be a powder-based pigment, a carbon-based pigment or the like, or a mixed crystal thereof. Examples include, but are not limited to, complex oxides such as Zn, Ti, Ni, Bi, V, and Y.

 [0033] The selective transmission layer 12 is formed by dispersing or dissolving the organic dye, or its derivative, additive, binder resin, etc. in an arbitrary organic solvent, and then ink jet. , Dating method, spin coating method, screen printing method, bar coating method, and other known solvent casting methods can be used. Further, as other film forming methods, methods such as thermal transfer and pressure transfer, and vapor deposition methods may be used, but are not limited thereto.

Next, the operation of the selective transmission filter in this embodiment will be described with reference to FIGS. Figure 9 shows the spectral characteristics of a typical fluorescent lamp (three-wavelength fluorescent tube). The fluorescent light has a peak of 力 near 440 nm, a G peak near 550 nm, and an R peak near 610 nm, while it also peaks around 490 nm between BG and 580 nm between GR. There is FIG. 10 shows spectral characteristics of a general plasma display. Generally used for plasma displays, B and G phosphors have a broad emission spectrum. Because of the overlapping of the bottoms of both peaks, light emission can be seen around 490nm. That is, unnecessary light emission is a factor that lowers the color purity. As shown in Figure 8, if the selective transmission filter attached to the plasma display panel is provided with absorption bands near 490 nm and 580 nm, the light emitted from the plasma display panel can be transmitted efficiently. The reflection of the wavelength component is suppressed, and the external light contrast is improved. The maximum value of the transmittance around 530 nm (G light) sandwiched between the absorption bands around 490 η m and 580 nm is preferably in the range of 65% to 99%. When the maximum value of the transmittance is low, the display light having the power of the plasma display panel is attenuated, and the luminance is remarkably lowered. Moreover, it is preferable that the half-value width of the maximum peak of the transmittance is in the range of lOnm to 50 nm. When it is 10 nm or less, the amount of display light near 530 nm (G light) decreases, and when it is 50 nm or more, the color purity is significantly reduced. Furthermore, it is preferable that the maximum values of the three points including the maximum values of transmittance around 450 nm (B light) and 620 nm (R light) are within a range of 10%. When a difference of 10% or more occurs, the object color of the filter is markedly colored. Furthermore, it is preferable that the minimum value of the transmittance of the absorber near the absorption band near 490 nm and around 580 nm is in the range of 0.01% to 30%. When it exceeds 30%, the external light contrast is significantly reduced.

 [0035] This action will be described in more detail with reference to FIG. Here, for the sake of convenience, it is assumed that the RGB transmittance is 100%, and the total transmittance is cut by 50% due to absorption in the wavelength region between BG and GR. Display light 31R, 3 1G, 31B from the plasma display panel 20 (in which the intensity is D) is not absorbed even if it passes through the selective transmission filter 10, and is emitted as display light 32 with an intensity ratio of 100%. . On the other hand, it is assumed that the external light 33 (in which the intensity is R) is totally reflected by the phosphor surface of the plasma display panel 20, and the reflected light 34 is reduced in light amount when passing through the selective transmission filter 10 twice. The strength ratio is 25% (50% X 50%). Therefore, as shown in the following formula (2), the contrast (LZR) in the bright place is 4 times that without the front filter and 2 times when the conventional front filter is used. In addition, the brightness of the display device is doubled compared to the case of using a conventional front filter, and the color purity is improved because light emission other than RGB is selectively cut.

 [0036] L / 0. 25R = 4L / R (2)

[0037] As an example of the organic dye used in the selective transmission layer 12 that realizes these functions, The absorption in the wavelength region includes perylene, and the absorption in the wavelength region between GR includes a combination of copper phthalocyanine.

 [0038] (Embodiment 2)

 A display device according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 13 shows a transmission projection screen provided with the selective transmission filter 10 of the present invention. This transmission type projection screen 40 is composed of a combination of a Fresnel lens sheet 42 and a lenticular sheet 41, and a selective transmission filter 10 similar to that of the first embodiment is disposed on the outermost surface on the observer side. And fixed via an adhesive layer 13. Since the external light 33 incident on the transmission projection staline is absorbed only in the wavelength region other than RGB by the selective transmission layer 12, reflection is suppressed (reflected light 34). On the other hand, the display lights 31R, 31G, and 3IB from the projector are passed through the selective transmission layer 12 efficiently only by the RGB components, and are viewed by the observer as display lights 32R, 32G, and 32B. Therefore, it is possible to realize a display with good external light contrast without reducing the luminance of the display light. In addition, the color purity of the display is improved. In this case, the permselective layer 12 is preferably a solid film.

 [0039] (Embodiment 3)

A display device according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 14 shows a screen for a laser projector provided with the selective transmission filter 10 of the present invention. This screen for a laser projector is configured by combining a selective transmission filter 10 similar to that in Embodiment 1 with a reflective film 15 that reflects the laser with high efficiency, and is particularly suitable for color display applications using an RGB laser. Is suitable. As the reflective film 15, a diffuse reflective film coated with an aluminum vapor deposition film or titanium oxide titanium can be used. Since the external light 33 incident on the laser projector screen is absorbed by the selective transmission layer 12 only in the wavelength region other than RGB, reflection is suppressed (reflected light 34). On the other hand, for the display lights 31R, 31G, and 3IB from the laser projector, only the RGB component efficiently passes through the selective transmission layer 12, is reflected by the reflective film 15, and becomes display lights 32R, 32G, and 32B. To be seen by the observer. Therefore, it is possible to realize a display with good external light contrast without reducing the luminance of the display light. Furthermore, the color purity of the display is improved. In this case, the permselective layer 12 is preferably a solid film. [0040] (Embodiment 4)

 A display device according to Embodiment 4 of the present invention will be described with reference to FIG. FIG. 15 is a side sectional view showing a state where the selective transmission filter of the present invention is mounted on the front surface of the plasma display panel. The fourth embodiment is a modification of the first embodiment, and differs from the first embodiment in that the selective transmission layer 12 of the selective transmission filter 10a is color-coded for RGB. The selective transmission layers 12R, 12G, and 12B are respectively arranged corresponding to the RGB light emitting cells of the plasma display panel 20. The selective transmission layer 12R transmits only R light emission, and the selective transmission layer 12G transmits only G light emission. The selective transmission layer 12B transmits only B light emission. According to the present embodiment, the display light 31 from the plasma display panel 20 is visually recognized by the observer as the display light 32 with a high transmittance as in the first embodiment. On the other hand, the external light 33 is absorbed by the selective transmission layer 12R in the wavelength region other than R, and the selective transmission layers 12G and 12B are also absorbed in the wavelength regions other than G and B by the reflected light per unit area. 34 is suppressed to about 1Z3 in the first embodiment, and as a result, the external light contrast is improved three times. The selective transmission filter 10a may include a partition wall 16. The partition wall 16 may be a black matrix. As a result, it is possible to prevent the mixture of the selective transmission layers 12R, 12G, and 12B and to further improve the external light contrast. Furthermore, an antireflection layer 14 or the like may be provided on the foreground on the viewer side.

 [0041] The selective transmission filter 10a is formed on the transparent filter substrate 11 by patterning a metal multilayer film by a sputtering method or by forming a pattern by a photolithographic method or an etching method after forming a coating film using a resin material. It can be formed by forming the partition wall 16 and further forming each selectively permeable layer 12.

 [0042] (Embodiment 5)

A display device according to Embodiment 5 of the present invention will be described with reference to FIG. FIG. 16 is a side sectional view showing a state where the selective transmission filter of the present invention is mounted on the front surface of a three-color juxtaposition type color EL display panel. In this display device, a selective transmission filter 10b similar to that in the first embodiment is fixed to the front surface of the EL display panel 50 via an adhesive layer 13. The general structure of the EL display panel 50 is such that a plurality of transparent electrodes 52 are formed on a transparent front substrate 51 such as a glass substrate, and a hole transport layer 5 is formed on the transparent electrode 52. 3. A light emitting layer 54 is sequentially laminated, and a metal electrode 55 is formed thereon. The transparent electrode 52 may be connected to a switching element such as a thin film transistor (not shown in FIG. 16). This enables active driving, while determining a certain aperture ratio. According to the present embodiment, the display light 31 from the EL display panel 50 is visually recognized by the observer as the display light 32 with a high transmittance as in the first embodiment. On the other hand, since the external light 33 is absorbed only in the wavelength region other than RGB by the selective transmission layer 12, the reflected light 34 is suppressed. Therefore, it is possible to realize a display with good external light contrast without reducing the luminance of the display light. In addition, the color purity of the display is improved. Furthermore, an antireflection layer 14 or the like may be provided on the foreground on the viewer side.

 [0043] (Embodiment 6)

 A display device according to Embodiment 4 of the present invention will be described with reference to FIG. FIG. 17 is a side sectional view showing a state in which the selective transmission filter of the present invention is mounted on the front surface of a three-color juxtaposition type color EL display panel. The sixth embodiment is a modification of the fifth embodiment, and is different from the fifth embodiment in that the selective transmission layer 12 of the selective transmission filter 10b is color-coded for RGB. The selective transmission filter 10c is substantially the same as the selective transmission filter 10b of the display device according to Embodiment 4, and detailed description thereof is omitted. According to the present embodiment, the display light 31 from the EL display panel 50 is visually recognized by the observer as the display light 32 with high transmittance as in the first embodiment. On the other hand, the external light 33 is absorbed by the selective transmission layer 12R in the wavelength region other than R, and the selective transmission layers 12G and 12B are also absorbed in the wavelength region other than G and other than B, respectively. The light 34 is suppressed to about 1Z3 in the fifth embodiment, and as a result, the external light contrast is improved about three times.

 Note that each of the above-described embodiments is an example, and the configuration is not limited to the configuration of each embodiment.

 Industrial applicability

[0045] The filter for a display device according to the present invention is provided with a narrow band selective absorption band at around 490 nm and around 580 nm, so that the original light emission of the display device can be reduced without impairing the original light emission of the display image. Even in the presence of external light, etc., it is possible to achieve a good contrast display, achieving both high brightness and high external light contrast, and improving the color purity of the display device and the sharpness of the display image. can do. In particular, it is useful as a display device such as a television.

Brief Description of Drawings

FIG. 1 is a side sectional view showing a state where a filter for a display device according to a first embodiment of the present invention is attached to the front surface of a plasma display.

 FIG. 2 is a graph showing an example of the change in absorption spectrum when a substituent causing steric hindrance is introduced into a rhodamine dye.

 FIG. 3 is a diagram showing the molecular structure of molecular unit A, which is a derivative of an azobenzene molecule.

FIG. 4 is a diagram showing the molecular structure of molecular unit B, which is a derivative of an azobenzene molecule.

FIG. 5 is a diagram showing the molecular structure of the second generation molecular unit.

FIG. 6 is a diagram showing the molecular structure of the third generation molecular unit.

 [FIG. 7] (a) is a conceptual diagram showing a core of a dendrimer structure, and (b) and (c) are conceptual diagrams showing an example of a dendrimer.

 FIG. 8 is a spectral characteristic diagram showing an example of light transmittance of the filter for a display device of the present invention.

FIG. 9 is a spectral characteristic diagram showing an example of a fluorescent lamp.

 FIG. 10 is a spectral characteristic diagram showing an example of light emission by the plasma display panel force.

 FIG. 11 is a schematic view for explaining the operation of the filter for a display device of the present invention.

 FIG. 12 is a side sectional view showing a conventional front filter for a plasma display.

 FIG. 13 is a side sectional view showing a state in which a display device filter according to a second embodiment of the present invention is mounted on a transmission type projection screen.

 FIG. 14 is a side cross-sectional view showing a state in which a filter for a display device according to a third embodiment of the present invention is attached to a reflection type process screen.

 FIG. 15 is a side sectional view showing a state where a filter for a display device according to a fourth embodiment of the present invention is attached to the front surface of the plasma display.

 FIG. 16 is a side sectional view showing a state in which a display device filter according to a fifth embodiment of the present invention is attached to the front surface of an EL display panel.

 FIG. 17 is a side sectional view showing a state in which a display device filter according to a sixth embodiment of the present invention is attached to the front surface of an EL display panel.

Explanation of symbols 10, 10a, 10b, 10c Selective transmission filter, 11 Filter substrate, 12 Selective transmission layer, 13 Adhesive layer, 14 Anti-reflection (AR) layer, 15 Reflective film, 16 Bulkhead, 20 Plasma display panel, 21 Front substrate, 22 Transparent display electrode, 23 insulating layer, 24 phosphor layer, 25 barrier rib, 26 insulating layer, 27 address electrode, 28 back substrate, 31B, 31G, 31R display light, 32B, 32G, 32R display light, 33 external light, 34 reflection Light, 41 Lenticular lens sheet, 42 Fresnel lens sheet, 50 EL display panel, 51 Transparent substrate, 52 Transparent electrode, 53 Hole transport layer, 54 Light emitting layer, 55 Metal electrode, 60 Tint glass, 62 Plasma display plate

Claims

The scope of the claims  [1] a transparent support;  A selectively permeable layer provided on at least one surface of the transparent support;  With  The selective transmission layer has at least one minimum transmittance in a wavelength range of 480 nm to 530 nm and a wavelength range of 570 nm to 600 nm, and at least one maximum transmittance in a wavelength range of 530 nm to 570 nm. And the maximum value of the transmittance is in the range of S65% to 99%, and the half width of the peak including the maximum value of the transmittance is in the range of 10 nm to 50 nm. Filter for display device.  [2] The filter for a display device according to [1], wherein the minimum value of the transmittance is in a range of 0.01% to 30%.  [3] The selective transmission layer further has at least one maximum value of transmittance in a wavelength range of 400 nm to 480 nm and a wavelength range of 600 nm to 650 nm, and each maximum value of the transmittance is 65. The range between% and 99%, and the difference between the maximum value and the minimum value at each maximum value of the transmittance is within a range of 10%. Filter for display devices.  [4] The display device according to any one of claims 1 to 3, wherein the selective transmission layer has a single-layer structure including two or more kinds of organic dyes or derivatives of organic dyes. Fineleta.  [5] The selective transmission layer has a sub-structure divided in units of pixels of red (R), green (G), and blue (B), and each of the sub-structures of R, G, and B The display device filter according to any one of claims 1 to 3, further comprising two or more kinds of organic dyes or derivatives of organic dyes.  6. The display device filter according to claim 4 or 5, wherein at least one kind of the organic dye derivative is fixed in a non-associated state in the selective transmission layer. [7] The selective transmission layer includes an organic dye or a derivative of an organic dye having a minimum value of at least one transmittance in a wavelength range of 480 nm to 530 nm or in a wavelength range of 570 nm to 600 nm. The display device filter according to claim 6. 8. The filter for a display device according to claim 6, wherein the derivative of the organic dye has at least one substituent that becomes a steric hindrance in a bonded state. [9] The display device filter according to any one of [4] to [8], wherein the derivative of the organic dye has a dendrimer structure having the organic dye as a nucleus. [10] The display device according to any one of [4] to [8], wherein the derivative of the organic dye has a structure in which the organic dye is introduced into a side chain of the linear polymer compound. Filter.  [11] The organic pigment derivative has a structure in which a C to C alkyl group is introduced into the organic pigment.  10 18  The filter for a display device according to any one of claims 4 to 8, characterized by comprising: [12] The filter for a display device according to any one of [1] to [11], wherein the selective transmission layer contains perylene and copper phthalocyanine as organic dyes. [13] The selective transmission layer further has a wavelength of 850ηπ! The filter for a display device according to any one of claims 1 to 11, having an infrared absorption function of ~ l lOOnm. [14] The selective transmission layer further has a wavelength of 200ηπ! The filter for a display device according to any one of claims 1 to 13, having an ultraviolet absorption function of 380 nm. [15] The filter for a display device according to any one of [1] to [14], further comprising an antireflection layer on the surface on the viewer side. [16] The filter for a display device according to any one of [1] to [15], further comprising an antiglare layer on the surface on the viewer side. [17] The filter for a display device according to any one of claims 1 to 16, on a surface on an observer side,  A transmissive projection screen capable of color display, comprising a lenticular lens sheet and a Fresnel lens sheet on opposite surfaces. [18] The display device filter according to any one of claims 1 to 16, on a viewer side surface;  A reflective film on the opposite surface; Reflective projector for color projectors with color display clean.  An EL display capable of color display, comprising the display device filter according to any one of claims 1 to 16 on a viewer-side surface.