JP5193426B2 - screen - Google Patents

Description

  The present invention relates to a screen suitably used for a liquid crystal projector.

  Since the projection display device can realize a large screen display relatively easily and in a small size and at a low cost as compared with the direct-view display device, the demand is increasing. In particular, a projection display device having a projection device using a liquid crystal display element as a two-dimensional optical switch element is different from a projection display device using a CRT projection tube, and there is no blur to the periphery of the screen by dot matrix display. Since high-definition display is possible, it is expected as a favorite of high-resolution digital television.

Screens for projecting these images are roughly classified into a reflective screen that is observed from the projector side and a transmissive screen that is observed from the opposite side of the projector with the screen interposed therebetween.
The transmission type screen is usually composed of a Fresnel lens sheet and a lenticular lens sheet. Since the lenticular lens has regularly arranged lenses having a linear shape, a moiré phenomenon tends to occur on the screen.

  Patent Document 1 discloses a transmission screen having a configuration in which a spherical lens is spread on a transparent substrate and fixed with a transparent resin. In this configuration, since a mold is not used, there is no size limitation in manufacturing, and a seamless large transmission screen can be realized. Furthermore, light incident from the spherical lens side converges due to the lens effect and isotropically diverges, so that a wide viewing angle can be obtained in both the horizontal and vertical directions. However, glare is likely to occur depending on the angle, and the display quality may be lowered.

  There is also a transparent screen that is pasted on a show window or the like and displays an advertisement or the like by a moving image or a still image. A hologram element is usually used for the transparent screen, and the image is determined by projecting transmitted light onto the hologram element from a projection device provided on the opposite side of the hologram element to the observer, and the projection light is forwarded by the hologram element. The image is recognized by the observer by diffracting and scattering the light (Patent Document 2).

  However, the hologram element is very expensive and has a problem that the viewing angle is limited because the diffraction and scattering angles are limited. In addition, since the hologram element needs to be a projector and the position of the observer and the observer must be set strictly, there is also a problem that the degree of freedom of installation is extremely low.

On the other hand, as a reflection type screen, an attempt has been made to improve contrast by selectively reflecting only a specific polarized light.
For example, Patent Documents 3 and 4 disclose a circularly polarized reflective screen using cholesteric liquid crystal. These reflect specific circularly polarized light and absorb opposite circularly polarized light to improve contrast. In Patent Document 4, glare due to specular reflection is reduced by controlling the reflection characteristics.

  Patent Document 5 discloses a reflection type screen that reflects a specific linearly polarized light with a multilayer structure. This screen has a mirror surface and is a major cause of glare. In Patent Document 6, an attempt is made to reduce glare by combining the reflective polarizing plate and the diffusing polarizing plate, but the effect is not sufficient and has not been put into practical use.

JP-A-2-77736 JP-A-11-202417 JP-A-5-107660 JP 2005-17751 A Special Table 2002-540445 WO03 / 098346

  An object of the present invention is to provide a screen with a bright projected image with high contrast and less moire and glare at low cost.

  In order to solve the above-mentioned problems, the present inventors have intensively studied a polymer material, a shape and the like for a polarizing plate. As a result, it has been found that a reflective projector having high contrast can be realized by using a screen in which an absorbing polarizing fiber and a reflecting polarizing fiber are crossed, and the present invention has been achieved.

That is, the present invention is as follows.
[1] A screen for receiving projected light having polarization to display an image, the screen including a molded product formed by intersecting an absorbing polarizing fiber and a reflecting polarizing fiber screen.
[2] The absorptive polarizing fiber is
2. The screen according to claim 1, wherein the thermoplastic resin fiber (A) adsorbs the dichroic dye (a).
[3] The reflective polarizing fiber is
(B) A fiber composed of at least two types of thermoplastic resins and having an alternating layer-like cross-sectional structure, the alternating layer being 5 layers or more, and the thickness of each layer being in the range of 0.02 to 1.0 μm And at least the two thermoplastic resins are fibers (B) having an optical interference function in which a difference in refractive index at a wavelength of 589 nm in the cross-sectional direction with respect to the length direction of the fibers is 0.01 or less. The screen according to claim 2 .
[4] The molded product is
(C) It contains an optical transparent resin (C) having a refractive index substantially equal to the refractive index in the cross-sectional direction with respect to the length direction of the fiber (B), and the fiber (A) is arranged in a unidirectional plane. 4. The screen according to claim 3, wherein the fibers (B) are arranged in a plane shape orthogonal to the fibers (A).
[5] The molded article according to claim 1 or 2 screen, wherein the including the set to absorptive polarizing fibers the reflective polarizing fiber and the warp yarns, and one of the weft fabric.
[6] The fibers (A) and (B) is screen according to claim 4, characterized in that encapsulated immobilized by the optically transparent resin (C).
[7] The screen according to claim 6, wherein the fiber (A) is a fiber made of a polyvinyl alcohol resin.
[8] The screen according to claim 7, wherein the polyvinyl alcohol resin has a degree of polymerization of 1000 or more and 40000 or less and a degree of saponification of 80 mol% or more and 100% or less.
[9] The screen according to any one of claims 7 to 8, wherein an average diameter of the polyvinyl alcohol-based resin fiber is 0.7 μm or more and 100 μm or less.
[10] The screen according to any one of [2] to [4] and [6] to [9], wherein the dichroic dye is iodine.
[11] screen according to any one of claims 3-4, and 6-9 refractive index difference of at least two thermoplastic resin of the fibers (B) is characterized in that at least 0.02.
[12] The screen according to any one of claims 3 to 4, and 6 to 9 , wherein an average diameter of the fiber (B) is 0.7 μm or more and 100 μm or less.
[13] The screen according to any one of claims 4 and 6 to 9 , wherein the optically transparent resin (C) is a thermoplastic resin.
[14] The screen according to any one of claims 4 and 6 to 9 , wherein the optically transparent resin (C) is a curable resin.
[15] The screen according to any one of claims 1 to 14, further comprising a metal reflective layer.

  According to the present invention, a fiber (A) in which thermoplastic resin fibers impregnated with a dichroic dye that is an absorbing polarizing fiber are arranged in a single direction, and a fiber (B) that has an optical interference function that is a reflecting polarizing fiber. ) Are arranged in a plane in an orthogonal direction, it is possible to provide a projector screen with a wide viewing angle at a low cost with a bright and high-quality image, high contrast, little moire and glare.

Hereinafter, the present invention will be described in detail.
The screen of the present invention crosses the absorbing polarizing fiber and the reflecting polarizing fiber to form a sheet having different reflection, absorption, and transmission optical characteristics depending on the polarization axis direction of linearly polarized light, and more preferably, a scattering layer, This is a reflection type projector screen in which scattering characteristics are controlled by adding and laminating an optical layer such as a scattering film.

  The screen used in the present invention is formed of an absorbing polarizing fiber and a reflecting polarizing fiber, and is characterized by combining selective absorption and selective reflection characteristics for polarized light with respect to the polarizing characteristics of the fiber. Therefore, when linearly polarized light is incident, the screen has a polarization direction (reflection axis) where reflection is greatest and a direction (absorption axis) where absorption is greatest (in the plane of the screen). When the polarization is matched with the reflection axis, the reflected light is strongly recognized by reflection of light and it is difficult to see through the opposite side. When the polarization is matched with the absorption axis, the light is absorbed and exhibits black.

  The screen of the present invention is characterized in that it is a sheet in which an absorbing polarizing fiber and a reflecting polarizing fiber are crossed, but when maximizing absorption with respect to the polarized light of the absorbing polarizing fiber, an orthogonal arrangement is preferable. The intersecting axis is not limited to being orthogonal, but can be adjusted to match the optical characteristics of the screen.

The absorptive polarizing fiber used in the present invention can be realized by the thermoplastic resin fiber (A) on which the dichroic dye is adsorbed, and the reflective polarizing fiber can be realized by the fiber (B) having an optical interference function. Can be obtained. Moreover, in order to make the best use of the optical characteristics of these polarizing fibers, it is preferable to suppress the surface reflection component. As one of the methods, the screen of the present invention receives projected light having polarization and displays an image. A screen, wherein the screen is formed by intersecting a thermoplastic resin fiber (A) on which a dichroic dye is adsorbed and a fiber (B) having an optical interference function, and the fiber (A) and the fiber (B) and the optically transparent resin (C) are formed into a molded product. Specifically, the fiber (A) and the fiber (B) are encapsulated and fixed by the optically transparent resin (C). It is done. Specific examples of these fibers (A) and (B) and the optically transparent resin (C) will be shown.

[Fibers made of thermoplastic resin fibers (A)]
The fiber (A) in the present invention is optically transparent and is preferably a fiber formed from a thermoplastic resin capable of adsorbing and orienting the dichroic dye. Examples of such thermoplastic resins include polyvinyl alcohol (hereinafter simply referred to as PVA), acrylic resin, nylon resin, polyolefin, polyester, polystyrene, polyether, polycarbonate, vinyl resin, polyurethane, polyamide, polyimide, and epoxy resin. Among these, PVA or a derivative thereof is particularly preferable. Derivatives of PVA include polyvinyl formal, polyvinyl acetal and the like, olefins such as ethylene and propylene, unsaturated carboxylic acids such as acrylic acid, methacrylic acid and crotonic acid, alkyl esters thereof, acrylamide and the like. (Hereinafter, PVA or a derivative thereof may be referred to as a PVA resin). The polymerization degree of PVA or a derivative thereof is about 1000 to 40000, and the saponification degree is about 80 to 100 mol%. Here, in order to use it as a polarizer, an element having excellent durability is obtained when the degree of polymerization and saponification of PVA or a derivative thereof is higher. Therefore, the degree of polymerization is 1200 or more and 30000 or less, and the degree of saponification is 90 or more. PVA of 100 mol% or less or a derivative thereof is preferable, and a polymerization degree of 1500 to 20000 and a saponification degree of 98 to 100 mol% are more preferable.

Hereinafter, as a material of the thermoplastic resin fiber, a fiber made of PVA resin (hereinafter simply referred to as PVA resin fiber) will be described as an example.
A plasticizer etc. can also be mix | blended with the said PVA-type resin fiber. Examples of the plasticizer include polyols and condensates thereof, and examples thereof include glycerin, diglycerin, triglycerin, ethylene glycol, propylene glycol, and polyethylene glycol. The amount of the plasticizer used is not particularly limited, but is preferably 20% by weight or less in the PVA resin. Moreover, additives, such as antioxidant, a ultraviolet absorber, a crosslinking agent, surfactant, can also be contained in PVA-type resin fiber.

  As a method (spinning method) for fiberizing the PVA-based resin, any commonly used method such as dry, wet, and dry wet can be employed. In these systems, the PVA resin can be produced (spun) using a solution dissolved in the following solvent. For example, water, dimethyl sulfoxide, dimethylformamide, dimethylacetamide, N-methylpyrrolidone, 1,3 dimethyl 2-imidazolidinone, ethylenediamine, diethylenetriamine, diethylenetriamine, glycerin, ethylene glycol, 3-methylpentane-1,3, Polyhydric alcohols such as 5-triol are used alone or in combination. Furthermore, any resin that dissolves the resin, such as an aqueous solution of an inorganic salt such as zinc chloride, magnesium chloride, rhodium calcium, or lithium bromide, or an aqueous solution of isopropanol can be used.

  The PVA-based resin fiber used in the present invention is a stretched product. This stretching process may be performed before dichroic dye dyeing, may be performed simultaneously with dyeing, or performed after dyeing. Also good. Of course, stretching may be performed in a plurality of stages. When the dichroic dye is dyed after drawing the fiber, the adsorbed dichroic dye is oriented along the drawing axis. At this dyeing stage, the dichroic dye is oriented and adsorbed along the drawing axis, while at the same time as the dichroic dye is dyed, or after dyeing, from the stretched spinning dope to immediately before dry heat drawing, or dry. You may impregnate a dichroic dye in any after hot-drawing. Examples of the method for applying the dichroic dye to the PVA fiber include a roller touch method, a dipping method, and a glass mouth contact method.

  The stretch ratio of the PVA resin fiber used in the present invention can be about 10 to 30 times as the maximum stretch ratio. At this time, the maximum draw ratio represents the ratio at which the fiber cuts during dry heat drawing. However, when the draw ratio is close to the maximum draw ratio, voids are generated inside the PVA-based resin fibers, whitening due to so-called irregular reflection of light is observed, and the transmittance and the degree of polarization are deteriorated. On the other hand, when the draw ratio is low, the orientation of the molecular chain and the dichroic dye is insufficient, and the strength and the degree of polarization are reduced. Therefore, the draw ratio of the PVA resin fiber is preferably 40% or more and 80% or less of the maximum draw ratio, more preferably 45% or more and 75% or less, and most preferably 50% or more and 70% or less. By this stretching process, a PVA resin fiber having a dichroic dye adsorbed and oriented is obtained.

  The thickness of the PVA-based resin fiber is preferably 0.7 μm or more and 100 μm or less, more preferably 0.8 μm or more and 80 μm or less, and further preferably 1 μm or more and 50 μm or less. If the fiber thickness is less than 0.7 μm, it is difficult to spin and stretch the fiber, and it is difficult to obtain a uniform color display due to surface scattering at a wavelength in the visible region depending on the fiber size. On the other hand, when the thickness of the fiber exceeds 100 μm, the fiber is too thick, so when trying to create a screen with a desired thickness when arranged in one direction, a gap occurs, resulting in a light leakage defect, It becomes difficult to achieve a high degree of polarization.

  As a PVA-based resin fiber that adsorbs and orients a dichroic dye, the thickness of the fiber does not need to be uniform, and if it achieves a high degree of polarization as a polarization function without gaps when arranged in one direction, A mixture of fine fibers and thick fibers may be used as an aggregate. The shape of the fiber is not limited to a circle, but may be an ellipse, triangle, quadrangle, pentagon, hexagon, or a polygon larger than that. As long as a high degree of polarization is achieved, the shape is not limited. Also, the shape of the aggregate fiber used for one PVA resin fiber does not need to be uniform, and may be a composite of various shaped fibers. This is preferable because it is not necessary to adjust them uniformly. The PVA-based resin fiber does not need to be an infinitely long fiber and includes a needle-like shape, and the aspect ratio is 10 or more, preferably 20 or more, more preferably the aspect ratio is 100 or more. . Here, the aspect ratio is the ratio of the length to the minor axis diameter. When the fiber shape is a polygon, the minor axis diameter is defined as the diameter of the circumscribed circle of the polygon. When the aspect ratio of the PVA-based resin fiber is less than 10, it is difficult to obtain a uniform alignment when aligning in the major axis direction. Although it is the maximum value of the aspect ratio, there is no upper limit as long as the PVA resin fiber is not cut.

The PVA resin fiber is used as an aggregate, that is, a bundle of fibers. Here, the number of fibers is not particularly limited depending on the thickness of the fibers and within a range in which the object and effect of the present invention can be achieved. For example, the density is 100 to 25 million fibers / cm ² .
For the purpose of improving the adhesion between the PVA-based resin fiber and the optical transparent resin, various different adhesion treatments such as corona treatment may be applied to the fiber surface.

  The PVA-based resin fibers are arranged in a plane in one direction. The arrangement is preferably such that the fibers are arranged in one direction in one or more layers. In the present invention, the state of one layer is also called a fiber. With regard to the optimum number of layers, it is possible to obtain relatively high polarization performance even with one layer, but it is a very difficult technique to arrange PVA resin fibers without gaps in one layer. When the PVA resin fibers are used, the number of laminated layers is preferably 2 or more and 100 or less, more preferably 3 or more and 100 or less, and most preferably 5 or more and 100 or less.

[Dichroic dye and dyeing method of thermoplastic resin fiber]
The fiber (A) made of the thermoplastic resin fiber has iodine or dichroic dye, which is a dichroic dye, adsorbed and oriented.

  When the thermoplastic resin fiber is a PVA-based resin fiber and the dichroic dye adsorbs iodine to it, an aqueous iodine solution can be used, and iodine ions are included as iodine and a dissolution aid, for example, potassium iodide. An aqueous solution is used. The iodine concentration is preferably about 0.01 to 0.5% by weight, and the potassium iodide concentration is preferably 0.01 to 10% by weight. In the iodine staining treatment, the temperature of the iodine solution is usually 20 to 50 ° C., and the immersion time is in the range of about 10 to 300 seconds. In addition, it is preferable to adjust the iodine content in the PVA-based resin fiber so that it is usually about 1 to 4% by weight so that the polarizer exhibits a good degree of polarization. In such iodine dyeing treatment, the iodine content in the PVA resin fiber is within the above range by adjusting the conditions such as the concentration of the iodine solution, the immersion temperature of the PVA resin fiber in the iodine solution, and the immersion time. Can be adjusted. Next, the PVA resin fiber subjected to iodine staining is subjected to boric acid treatment. The boric acid treatment is performed by immersing a PVA resin fiber dyed with iodine in an aqueous boric acid solution. The boric acid concentration in the boric acid aqueous solution is preferably about 2 to 15% by weight, the temperature of the boric acid aqueous solution is preferably in the range of 50 to 85 ° C., and the immersion time is preferably about 30 to 1000 seconds. The aqueous boric acid solution can contain iodine ions with potassium iodide. A boric acid aqueous solution containing potassium iodide can obtain a so-called neutral gray polarizing fiber having a substantially constant absorbance over almost the entire wavelength range of visible light, that is, a screen with little coloration.

  When the dichroic dye is a dichroic dye, the dichroic dye is preferably a water-soluble dye such as an acid dye or a direct dye, and the structure thereof includes, for example, an azo dye, a stilbene dye, or an anthraquinone dye. Dyes, methine dyes, cyanine dyes and the like can be used. Specific examples include the disazo compounds described in JP-A-59-145255 and JP-A-60-156759, the trisazo compounds described in JP-A-3-78703, and the color index general name. CI Direct Yellow 12, CI Direct Yellow 44, CI Direct Orange 26, CI Direct Orange 39, CI Direct Red 2, CI Direct Red 23, CI Direct Red 31, CI Direct Red 79, CI Direct Red 81, CI Direct Vilet 9, CI DirectVilet 35, CI Direct Vilet 51, CI Direct Blue 15, CI Direct Blue 78, CI Direct Blue 90, CI Direct Blue 168, CI Direct Blue 202, CI Direct Blue 203, CI Direct Brown 2, CI Direct Black 17, CI Direct Black 19, CI Direct Black 118, CI Direct Black 132 and the like. These water-soluble dyes preferably have a pigment component content that can impart polarizing ability of 95%, more preferably 99% or more (both in weight ratio). Impurities other than the dye component are removed by a method such as an ion exchange membrane method or a recrystallization method. In actual use, since a single dye has a polarization characteristic only in a specific wavelength range, a polarizing element film having excellent polarization characteristics over the entire wavelength range of visible light of 400 to 700 nm, which is most commonly used, is used. In order to obtain it, it is preferable to use two or more water-soluble dyes having absorption characteristics in different ranges within this wavelength range. Examples of specific combinations include CI Direct Orange 39, CI Direct Red 81, green blue described in Example 23 of JP-A-59-145255, and blue of JP-A-3-78703. There are blends. As a dichroic dyeing method, an aqueous dye solution having a dye concentration of 0.02 to 0.1% by weight is used, and a PVA resin fiber is used at a temperature of 30 to 50 ° C. for about 100 to 600 seconds. Immerse. The dyed PVA resin fiber is preferably immersed in an aqueous boric acid solution having a boric acid concentration of about 2 to 15% by weight, as in the case of iodine.

[Fiber having optical interference function (B)]
The fiber having an optical interference function is one that interferes and develops the color of the wavelength in the visible light region by optical reflection and interference effects. Examples of fibers having an optical interference function are disclosed in Japanese Patent No. 3356438, Japanese Patent Application Laid-Open No. 11-124773, and Japanese Patent Application Laid-Open No. 2005-15962. The fiber having an optical interference function is a fiber having an alternating layered cross-sectional structure composed of two or more types of thermoplastic resin components, and the refractive index of the optical resin is different because the refractive index of the thermoplastic resin is different. And an interference effect due to the product of the thickness of each layer.

  The optical interference effect is greatly influenced by the refractive index difference between the two thermoplastic resin layers, the optical distance of each layer (refractive index × the thickness of each layer), and the number of layers.

  First, regarding the two types of thermoplastic resins used for fibers having an optical interference function, the higher refractive index resin (sometimes referred to as a high refractive index resin) has a refractive index of 1.49 to 1.88. The resin having a lower refractive index (sometimes referred to as a low refractive resin) is preferably appropriately selected from those having a refractive index in the range of 1.35 to 1.55. In particular, the refractive index difference between the two thermoplastic resins is at least 0.02 or more, preferably 0.07 or more, and most preferably 0.15 or more. As for the combination of the thermoplastic resins, aromatic polyesters such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, and polycarbonate are preferable as the high refractive resin having a high refractive index and fiber forming property. The refractive indexes of these resins are as high as 1.58 for polyethylene terephthalate, 1.63 for polyethylene naphthalate, 1.55 for polybutylene terephthalate, 1.55, and 1.59 for polycarbonate, for example. Furthermore, when these resins are used to form fibers, high orientation occurs in the fiber axis direction, resulting in large birefringence. The birefringence has a high value such as 0.22 for polyethylene naphthalate, 0.153 for polyethylene naphthalate, and 0.20 for polycarbonate. On the other hand, examples of low refractive resins include methacrylates such as polymethyl methacrylate (refractive index 1.49), polyolefins such as polyethylene (refractive index 1.51) and polypropylene, nylon 6 (refractive index 1.53), and the like. Mention may be made of aliphatic polyamides. Among these resins, polymethyl methacrylate has a birefringence of almost 0, and nylon 6 has a lower value than a highly refractive resin such as 0.08.

  Moreover, it is preferable that the thickness of the thermoplastic resin layer required for the cross-sectional structure of an alternating layer form is the range of 0.02-1.0 micrometer. When the thickness is less than 0.02 μm or exceeds 1.0 μm, it is difficult to obtain the expected optical interference effect in the visible light region. Furthermore, the thickness is preferably in the range of 0.05 to 0.15 μm. Further, when the optical distance between the two components, that is, the product of the layer thickness and the refractive index is equal, a higher optical interference effect can be obtained. In particular, when twice the sum of the two optical distances equal to the primary reflection is equal to the distance of the specific wavelength, the maximum interference effect at the specific wavelength can be obtained. In this case, it is necessary to adjust so as to obtain a uniform interference effect in the visible light region, particularly 400 to 700 nm, and it is difficult to obtain this characteristic with a monofilament. A fiber having an optical interference function having a maximum in the vicinity of 550 nm and 650 nm was combined, and a multifilament that obtains substantially uniform optical interference in the visible light region (400 to 700 nm) was used.

  Furthermore, the number of layers that require an alternate layered cross-sectional structure is preferably 5 to 120 layers. When the number of layers is less than 5, not only the interference effect is small, but also the interference color changes greatly depending on the viewing angle. On the other hand, when the number of layers exceeds 120, the die structure becomes complicated, and it becomes difficult to produce the yarn, and the laminar flow is liable to occur, resulting in a non-uniform layered structure. The alternating layered cross-sectional structure is more preferably 10 to 100 layers or less, and most preferably 10 to 80 layers or less.

  The cross-sectional shape of the fiber having an optical interference function is not particularly limited, but it is a flat structure, and it is preferable that the long axis of the cross-sectional structure of the alternate layer shape is arranged in parallel with the long-axis direction of the flat cross-section. When the fiber has a flat cross-sectional shape and has a long axis of a cross-sectional structure of alternating layers parallel to the long axis direction, the fiber is viewed from a direction perpendicular to the surface formed in the flat long axis direction and the fiber length direction. Sometimes, the reflected light due to optical coherence can be observed most strongly. At this time, when processing a fiber having an optical interference function consisting of a flat cross-sectional shape, the long axis of the flat cross-sectional shape is aligned in parallel to the stressed surface by external stress such as tension or friction force acting on the fiber. Orientation controllability can be expressed. At this time, the optical interference function can be maximized by adjusting the incident light so that the surface is formed in the flat major axis direction and the fiber length direction. In order to give the fiber self-orientation controllability, it is necessary that the flatness is 2 or more and 15 or less. For fibers with a flatness ratio of 2 or less, good self-orientation controllability cannot be obtained, and gathers in a close-packed shape in the fiber laminate due to external stress such as tension and friction force acting on the fibers, The orientation of the cross-sectional structure of the alternating layers of fibers that exhibit an optical interference function is a random arrangement, and a sufficient optical interference function cannot be obtained. On the other hand, if the flatness ratio exceeds 15, the shape becomes excessively thin, so that it becomes difficult to maintain the cross-sectional form, and defects such as a part of the cross-section being bent occur. The flatness of the fiber having an optical interference function is more preferably 2.5 or more and 13 or less, and most preferably 3 or more and 10 or less.

  Regarding the refractive index difference in the cross-sectional direction of each of the two or more kinds of thermoplastic resins in the optical interference fiber, 0.01 or less is preferable at a wavelength of 589 nm. When the refractive index difference in the cross-sectional direction of each of the two or more kinds of thermoplastic resins is large, when the fiber in the present invention is formed as a polarizing element, the transmission axis of the polarizing element and the cross-sectional direction of the fiber having an optical interference function are the same. However, when the refractive index in the cross-sectional direction of the cross-sectional structure of the alternating layer structure is different, the reflected light is generated due to the difference in refractive index between the layers, so that the amount of transmitted light is reduced and the polarization function as a polarizing element is reduced. It becomes. The difference in the refractive index at the wavelength 589 nm is minimized because the wavelength 589 nm corresponds to the NaD line, so that the refractive index can be easily observed with a light source using the NaD line, and the green color with high visibility is obtained. By adjusting the refractive index difference to the minimum at the wavelength to be exhibited, there is an effect of maintaining good polarization characteristics in visible light and minimizing the influence of visual tint. In the fiber having an optical interference function in the present invention, the difference in refractive index in the cross-sectional direction of each of the two or more thermoplastic resin components is an average refractive index difference of 0.01 or less in the wavelength range of 500 to 700 nm. More preferably, the average refractive index difference is 0.01 or less in the wavelength range of 400 to 700 nm. As a method of adjusting the difference in refractive index in the cross-sectional direction in each of two or more kinds of thermoplastic resin components, the refraction in the cross-sectional direction can be achieved by drawing a fiber having an optical interference function to a specific draw ratio. The ratio can be adjusted, and the draw ratio needs to be adjusted depending on the type of resin used. As a drawing process of a fiber having an optical interference function, the undrawn fiber is 2 to 20 times in a heating bath at a temperature higher than the glass transition temperature of the high refractive index resin and the low refractive index resin and lower than the crystal temperature. It is good to stretch. Regarding the draw ratio, if the draw ratio is less than 2 times, it is difficult to realize a predetermined layer thickness having optical interference, and if the draw ratio exceeds 20 times, fiber breakage or fiber voids are generated. , Scattering of light occurs, causing the characteristics of the polarizing element to deteriorate.

  The fiber diameter (or the length of the major axis of the cross section) having an optical interference function is preferably 1 μm or less and 50 μm or more. When the fiber diameter having the optical interference function is 1 μm or less, it becomes difficult to take an alternate layered cross-sectional structure necessary for the optical interference function, and when the fiber diameter is 50 μm or more, it becomes difficult to control the resin discharge of the fiber processing. Therefore, it becomes difficult to obtain a homogeneous fiber. More preferably, they are 2 micrometers or more and 40 micrometers or less, More preferably, they are 3 micrometers or more and 30 micrometers or less.

  Examples of the fiber having an optical interference function include the shapes shown in FIGS. 1- (a) to (d) as typical examples, but the layered structure is divided into two layers, and the layered structure among the fibers. Is divided into two or three, as long as it has an alternate layer structure having an optical interference function. 1- (a) shows a shape in which two types of resins having different refractive indexes are alternately laminated in the major axis direction of the flat cross section, and FIG. 1- (b) shows a flat cross-sectional shape laminated in a donut shape. FIG. 1- (c) shows a shape in which reinforcing portions made of the above-mentioned resin or other resin are interposed in the intermediate portion of the alternating lamination, and FIG. 1- (d) shows a reinforcing portion on the outer peripheral portion. Show shape.

  The fiber having the optical interference function is arranged in a plane in one direction. The arrangement is preferably such that the fibers are arranged in one direction in one or more layers. With regard to the optimum number of layers, it is possible to obtain a relatively high polarization performance even with one layer, but it is a very difficult technique to arrange fibers without gaps in one layer. When the fibers are used, the number of laminated layers is preferably 2 or more and 100 or less, more preferably 3 or more and 100 or less, and most preferably 5 or more and 100 or less. As a fiber having an optical interference function to be laminated, in order to obtain an optical interference function uniformly at a wavelength of visible light, a fiber having a maximum optical interference effect has a wavelength of 400 to 500 nm, a fiber of 500 to 600 nm, 600 to 700nm fibers may be combined and laminated, and if the effect of optical interference of visible light is obtained, there is no limitation on the type of fiber combination, but if the number of types increases, the number of layers increases too much, Since the amount of transmitted light is reduced, 10 or less types are preferable.

  Regarding the fiber (B), in order to complement the RGB colors, the fiber (B) corresponding to three or more colors may be used at once, or may be used as a twisted yarn, and the three colors may be regularly ordered. You can line them up. In order to suppress the glare of the reflected light of the fiber (B) and widen the viewing angle, it is effective to increase the ratio of the number of twisted yarns, and the twist can be adjusted in accordance with the optical characteristics. As the number of twists of the fiber (B), sweet twist (about 500 to 1000 times / m), medium twist (about 500 to 1000 times / m), strong twist (about 1000 to 2500 times / m), Although there are extremely strong twists (twist number of 2500 times / m or more), any of them may be used according to the optical characteristics. The number of twists of the fiber (B) is preferably greater than 0 and less than 2500 times / m, more preferably 10 to 2000 times / m, and still more preferably 100 to 1500 times / m.

[Optical transparent resin (C)]
In the present invention, it is basically formed from a thermoplastic resin fiber (A) containing a dichroic dye, a fiber (B) having an optical interference function, and an optical transparent resin (C). For example, the thermoplastic resin fiber (A) and the fiber (B) having an optical interference function take the form of a plate or the like that is wrapped and fixed by the optical transparent resin (C). This is because the fiber (A) and the fiber (B) alone cannot maintain the state of being aligned in one direction, and the polarization performance cannot be continuously expressed, and the thermoplastic resin fiber as the fiber (A) is in the atmosphere. This is because the directly exposed form is remarkably affected by temperature and humidity, tends to cause shrinkage due to moisture absorption, disorder of orientation of the dichroic dye, etc., and cannot achieve high durability. The optically transparent resin (C) plays an important role as a function of suppressing deterioration of the screen while fixing and holding the fibers (A) and (B).

  As the optical transparent resin (C), the fiber (A) and the fiber (B) are arranged and finally fixed, and plays a role as a substrate as a screen. Therefore, the optically transparent resin (C) is preferably one that has little or no absorption in the visible region and exhibits good adhesion to the fibers constituting the fibers (A) and (B). The optical transparent resin functions as a base material for the screen. Therefore, if the substrate itself has birefringence, it can be a disadvantage of light penetration when the screen is arranged in crossed Nicols, so materials such as thermoplastic resins, heat or photo-curing resins having low birefringence are preferred. . The optical transparent resin in the present invention is indispensable to be transparent in the visible region. Specifically, when the optical transparent resin is a film having a thickness of 50 μm at a wavelength of 400 nm to 800 nm, The measured light transmittance needs to be 80% or more, preferably 85% or more, and most preferably 90% or more.

Examples of the material of the optically transparent resin (C) are shown below.
Specific examples of the thermoplastic resin include acrylic resins such as poly (methyl methacrylate), polyolefins such as polyethylene, polyesters such as polyethylene terephthalate, polyethers such as polyphenylene oxide, vinyl resins such as polyvinyl alcohol, polyurethane, polyamide, Polyimide, epoxy resin, copolymer using two or more monomers constituting these, further poly (methyl methacrylate) and polyvinyl chloride weight ratio 82:18 mixture, poly (methyl methacrylate) and polyphenylene oxide weight Non-birefringent polymer blends such as a 65:35 ratio mixture and a 77:23 weight ratio of styrene / maleic anhydride copolymer and polycarbonate may be exemplified, but are not limited thereto.

  One example of the optically transparent resin is a curable resin. This is preferable as a material excellent in workability, for example, in that the resin (C) is rapidly cured after the resin is applied to the fibers (A) and (B). A representative example of the curable resin is a crosslinked resin obtained by curing through a crosslinking reaction or the like by external excitation energy. These are actinic radiation curable resins that are cured by irradiation with actinic rays such as ultraviolet rays and electron beams, and thermal crosslinkable resins that initiate a crosslinking reaction by heat.

  A typical example of the actinic radiation curable resin is an ultraviolet curable resin. Examples thereof include an ultraviolet curable polyester acrylate resin, an ultraviolet curable acrylic urethane resin, an ultraviolet curable methacrylate ester resin, an ultraviolet curable polyester acrylate resin, and an ultraviolet curable polyol acrylate resin. In particular, UV curable polyol acrylate resins are good, such as trimethylolpropane triacrylate, ditrimethylolpropane tetraacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, alkyl-modified dipenta. Photopolymerizable monomer oligomers such as erythritol pentaerythritol are preferred.

  Examples of the electron beam curable resin are preferably those having an acrylate functional group, such as a polyester resin, polyether resin, acrylic resin, epoxy resin, urethane resin, alkyd resin, spiroacetal resin having a relatively low molecular weight. , Polybutadiene resin, polythiol polyene resin and the like.

  Examples of the thermosetting resin include an epoxy resin, a phenoxy resin, a phenoxy ether resin, a phenoxy ester resin, an acrylic resin, a melamine resin, a phenol resin, and a urethane resin, or a mixture thereof.

  In the present invention, any of the above-mentioned curable resins can be used suitably, but it is necessary to select an optical transparent resin having a refractive index that substantially matches the refractive index in the cross-sectional direction of the fiber (B). . Here, “substantially match” means that the difference from the value of the refractive index in the cross-sectional direction of the fiber (B) is within 0.01. By using the optical transparent resin (C) having a refractive index that substantially matches the refractive index in the cross-sectional direction of the fiber (B), a screen having a high transmittance can be obtained.

[Textile processing]
The screen of the present invention can be preferably composed of a woven fabric composed of fibers (A) and fibers (B). For use as a screen, it is preferable to weave at a crossing angle of approximately 90 ° preferably at a high density, and it is preferable that there is no gap between the fabrics. Examples of techniques for forming fibers into high-density fabrics include techniques disclosed in Japanese Patent Application Laid-Open Nos. 09-170175 and 2000-008247, for example. However, existing high density woven fabric technology may be used. As for the woven fabric, in order to eliminate the gap between the fibers, a secondary process such as calendering by hot pressing or the like to flatten the fibers may be performed. The fiber used for the woven fabric may be either a monofilament or a multifilament, but a multifilament is preferable in that the handleability of the handling surface and the degree of polarization are further improved because the gap between the fibers is reduced. . The width and length of the obtained woven fabric are not particularly limited, but industrially, 400 mm or more and 4000 mm width or less, preferably 1 m or more in length, 500 mm or more and 3500 mm width or less, and more preferably 10 m or more in length. Most preferably, the width is 600 mm or more and 3000 mm or less and the length is 100 m or more. When the width is less than 400 mm and the length is less than 1 m, the merit of a large screen that can be used for the screen is lost, and when the width is larger than 4000 mm, it is difficult to wind up uniformly as a roll film. The warp and weft in the woven fabric. When the fiber (A) is used as the warp, the fiber (B) is used as the weft, and when the fiber (B) is used as the warp, the fiber (A) is used as the weft. It does n’t matter.

  At this time, when a screen is made using a woven fabric having warps as fibers (A), the screen has a roll shape because the absorption axis of the screen is in the major axis direction (length direction) of the fibers (A). It can be adjusted in the direction perpendicular to the winding direction when it is created.

  In addition, in a conventionally known biaxial woven fabric, a fiber (A) is attached at a certain angle with respect to the length direction of the woven fabric by using a “diagonal weaving” loom that diagonally intersects warp and weft. Can be processed into a sheet. Techniques for oblique weaving of biaxial woven fabrics are disclosed in Japanese Patent Publication No. 48-30032, Japanese Patent Publication No. 48-31951, Japanese Patent Publication No. 51-28748, and Japanese Patent Publication No. 63-196738. In recent years, it has been announced that Kuwamura Textile (Nakamachi, Taka-gun, Hyogo) and a loom sales company “Katayama Shoten” (Nishiwaki City) have developed a special weaving machine for “diagonal weaving” that crosses warp and weft diagonally. (Kobe Shimbun 2005/2/25 article). In this diagonally woven biaxial woven fabric, the fiber (A) is used for the warp and the fiber (B) is used for the weft. By adjusting the crossing direction of the fibers (A) that are the wefts, it is possible to adjust the angle of the absorption axis of the screen made of the obtained oblique fabric sheet.

As the other woven fabric used in the present invention, it is possible to use a multiaxial fiber woven fabric such as a triaxial woven fabric or a four-axial woven fabric, and the fiber (A) is provided in the longitudinal direction of the woven fabric. It can be processed into a sheet with a specific angle. As a method of creating a multiaxial fiber fabric that exceeds the biaxial direction, the yarns in one direction are arranged, and the yarns in different directions are arranged in the same manner, and further overlapped in the direction exceeding two directions. Manufactured by fixing with multi-directional yarn by applying adhesive solution, powder, stitching and integrating with yarn, or pre-spraying thermal adhesiveness to one-direction yarn I can do it. All of these production methods can be created by equipment for aligning yarns in one direction and in other directions and manufacturing equipment for fixing each yarn to maintain the yarns that are aligned when bonded (for example, JP (See Sho 62-54904, JP 47-6585). Further, as the adjustment of the crossing angle between the warp warp and the weft weft, it is possible to easily adjust the crossing angle between the warp warp and the weft weft by passing through the fabric angle adjusting device. The angle-adjusted woven fabric may be used as a single woven fabric, or the angle-adjusted woven fabric may be laminated and melt-pressed to be handled as a high-order multiaxial fiber woven fabric.
Examples of the woven fabric include plain weave, twill weave, satin weave, horizontal stripe weave, and leash weave, and any of them may be used.

〔screen〕
The thickness of the screen of the present invention can usually be 0.02 to 3 mm.
As a method for producing the screen of the present invention, as an example of using a cured resin as the optical transparent resin (C), the cured resin is applied to the fibers (A) and (B) using a solvent or the like as necessary, and cured. The method of manufacturing through drying etc. is mentioned. In view of productivity, it is preferable to form a cured resin layer immediately after application, and an ultraviolet curable resin is more preferable in consideration of materials used for general purposes and processing equipment.

  The screen of the present invention may be surface treated. As the surface treatment, a surface which is not bonded to the liquid crystal cell may be subjected to a treatment for the purpose of hard coat layer, antireflection treatment, sticking prevention, diffusion or antiglare.

  Anti-glare treatment is performed for the purpose of preventing the external light from being reflected on the surface of the screen and obstructing the visibility of the light transmitted through the screen, for example, a roughening method using a sandblasting method or an embossing method, It can be formed by imparting a fine concavo-convex structure to the surface of the transparent protective film by an appropriate method such as a method of blending transparent fine particles. The fine particles to be included in the formation of the surface fine concavo-convex structure are, for example, conductive materials made of silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide, antimony oxide or the like having an average particle size of 0.5 to 50 μm. In some cases, transparent fine particles such as inorganic fine particles, organic fine particles made of a crosslinked or uncrosslinked polymer, etc. are used. When forming a surface fine uneven structure, the amount of fine particles used is generally about 2 to 50 parts by weight, preferably 5 to 25 parts by weight, based on 100 parts by weight of the transparent resin forming the surface fine uneven structure. The antiglare layer may also serve as a diffusion layer (viewing angle expanding function or the like) for diffusing polarized transmitted light to expand a viewing angle or the like.

  The screen of the present invention is installed such that the reflection axis direction of the reflective polarizing fiber coincides with the polarization direction of the liquid crystal projector. This makes it possible to effectively scatter linearly polarized light that contributes to the image, and a bright display can be obtained. In addition, since light orthogonal to the reflection axis that is not related to the image is in the same direction as the absorption axis of the absorbing polarization fiber, scattering can be suppressed by absorbing the light. Therefore, it becomes possible to effectively absorb external light and improve the contrast of the display image.

  If the liquid crystal projectors are not aligned in the three polarization directions RGB, the directions need to be aligned. As a method for aligning the linearly polarized light of the projector, for example, a color select film manufactured by Color Link Inc. can be used.

The screen of the present invention may be affixed to a transparent substrate using an adhesive or a pressure sensitive adhesive. Examples of the transparent substrate include a glass plate and an acrylic plate.
There is no limitation on the position of the screen on the transparent substrate, whether it is on the projector side or on the opposite side of the projector.

  The screen of the present invention may be provided with a reflective layer such as a metal layer on the back surface. In the case of a reflective screen, an image backscattered on the projector side (rear) is observed. However, a part of the image is scattered forward and escapes to the opposite side of the observer, and the brightness of the image may decrease. In order to prevent this, a reflective layer made of a metal layer or the like may be provided on the rearmost surface when viewed from the projector side. The reflection layer reflects the forward scattered image and returns to the rear, so that the brightness of the image can be increased. On the other hand, polarized light irrelevant to the image is absorbed by the absorptive polarizing fiber, so that there is no risk of contrast reduction or glare.

  There is no restriction | limiting in particular in this reflection layer, Metal thin films, such as aluminum and silver, metal foil, a metal plate, etc. can be illustrated preferably. According to the present invention, a projector screen having excellent display quality is provided by forming a scattering layer containing a filler on a sheet made of a polarizing fiber having different optical characteristics depending on the polarization axis direction of linearly polarized light. can do.

Examples of the present invention will be described below, but the present invention is not limited thereto. Moreover, the material characteristic value etc. which are described in this specification were obtained by the following evaluation methods.
(1) Measurement of refractive index measurement in the fiber cross-sectional direction of the fiber (B) Using a polarizing microscope, an interference filter (589 nm) was installed in the light source and adjusted to be a linearly polarized light source.
The fiber was placed on a glass slide and installed so that linearly polarized light was parallel to the cross-sectional direction of the fiber.
Using the refraction adjusting liquid, from 1.500 to 1.600, at 0.002 STEP, while observing the microscope, it was observed that the outer shape of the fiber disappeared by dropping the refraction adjusting liquid sequentially. .
(2) Thickness measurement Measured with an electronic micro manufactured by Anritsu Corporation.
(3) Evaluation of projector screen The visibility on the opposite side of the screen was evaluated visually. The items were brightness, contrast, and glare, with the case being excellent being excellent, the level having no problem in use being good and being inferior.

[Example 1]
PVA (Kuraray Co., Ltd., polymerization degree 4000, saponification degree 99.9%) was dissolved in dimethyl sulfoxide (hereinafter abbreviated as DMSO) as a solvent to prepare a spinning stock solution having a PVA concentration of 16% by weight. This spinning stock solution is dried and wet-spun with a spinning draft of 2.0 and an air gap of 30 mm in a coagulation bath made of methanol from a die having a pore size of 100 μm and a pore number of 300 at 100 ° C., and then DMSO is extracted with methanol in a methanol bath. Spinning and drawing were performed, followed by drying to obtain an undrawn PVA yarn (diameter 10 μm). This unstretched yarn was stretched 6.5 times using a heating roller at 110 ° C. to obtain a PVA fiber (diameter 2 μm). This PVA fiber was fixed in the length direction and immersed for 60 seconds in an aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.075 / 5/100. Next, it was immersed in a boric acid-containing aqueous solution at 65 ° C. in which the weight ratio of potassium iodide / boric acid / water was 6 / 7.5 / 100 for 300 seconds. This was pure, washed with water and dried.

  Next, polyethylene naphthalate copolymerized with 10 mol% of terephthalic acid and 1 mol% of sodium sulfoisophthalic acid (the intrinsic viscosity is 0.58; 89 mol% of naphthalenedicarboxylic acid, hereinafter referred to as copolymerized PEN) Nylon 6 (intrinsic viscosity 1.3) was melt-spun so that the number of layers of the alternating laminate portion was 61 and the surroundings were covered with copolymerized PEN, and wound at a speed of 1000 m / min. I took it. The obtained unstretched fiber was stretched 2.0 times with a roller stretching machine. The obtained fiber is a multi-fiber consisting of 12 filaments, and the cross-sectional shape thereof is as shown in FIG. 1- (d). The major axis length in the fiber section direction is 60 μm, the minor axis length is 19 μm, and the flat shape is flat. The thickness of the copolymer PEN layer was 0.09 μm and the thickness of the nylon layer was 0.10 μm. At this time, as an interference effect of the fiber having the optical interference function, a red to orange interference color having a maximum reflection characteristic at a wavelength of 640 nm was confirmed (optical interference fiber (red)). Similarly to the above, as a fiber having an optical interference function made of copolymerized PEN and nylon 6, a fiber having a maximum reflection characteristic at a wavelength of 530 nm with respect to a green color (major axis length in the fiber cross-sectional direction is 49 μm, minor axis length is 14 μm). The flatness is 3.5, and the layers of the alternately laminated portions have a maximum thickness of 0.07 μm for the copolymerized PEN layer, 0.08 μm for the nylon layer, an optical interference fiber (green), and a reflection characteristic with a wavelength of 460 nm for blue. The resulting fiber (major axis length 45 μm in the fiber cross-sectional direction, minor axis length 11 μm, flatness 4.1, between the layers of the alternately laminated portion, the copolymer PEN layer thickness 0.06 μm, nylon layer thickness 0.06 μm, Optical interference fiber (blue)) was obtained (all multifilaments consisting of 12 filaments). The refractive index in the cross-sectional direction at a wavelength of 589 nm of any of these fibers having an optical interference function was 1.526. Moreover, the refractive index of copolymer PEN is 1.62, the refractive index of nylon 6 is 1.53, and the refractive index difference between the two thermoplastic resins is 0.09.

  This iodine-impregnated PVA fiber (A) and each optical interference fiber that is a multifilament (red, about 90 μm, blue, about 60 μm, green, about 70 μm, about 5 layers each for a total of about 15 layers. Each polyester fiber (B) of layer) was subjected to a plain weaving process using three bundles of twisted yarns with warps as fibers (A) and wefts as fibers (B) to prepare a fiber fabric.

Next, BPEF-A: 66 parts by weight, UA: 434 parts by weight, toluene: 40 parts by weight as a diluent solvent, “Irgacure” 184: 15 parts by weight as a photoinitiator, and SH28PA: 0.18 parts by weight as a leveling agent Were sequentially added to prepare a solution that was stirred until uniform.
BPEF-A: Bisphenoxyethanol full orange acrylate (manufactured by Osaka Gas)
UA: urethane acrylate (“NK Oligo U-15HA” manufactured by Shin-Nakamura Chemical)
"Irgacure" 184 (Ciba Geigy)
SH28PA (Toray Dow Corning)

The prepared solution was uniformly applied on the woven fabric composed of the fibers (A) and (B) prepared above to form a state in which the fiber woven fabric was encapsulated by the solution. This was irradiated with ultraviolet light having a cumulative light quantity of 700 mJ / cm ² with a high-pressure mercury lamp having a strength of 160 w, the solution was cured, and a woven fabric composed of PVA fibers (A) and polyester fibers (B) was encapsulated by an optical transparent resin. A projector screen having a thickness of 240 μm was obtained. At this time, the refractive index of the optical transparent resin was 1.526.
The projector screen thus obtained was arranged as shown in FIG. 2, and the visibility of the screen was evaluated.

The projector screen performance was as follows.
Brightness Excellent Contrast Excellent Glitter Excellent

[Comparative Example 1]
In accordance with the description in Patent Document 6 (7 pages, lines 23 to 27), a laminate of 3MDPRF and DBEF was used as a screen. In this case, the transmission axis of DRPF and the transmission axis of DBEF are arranged to be the same.
The projector screen thus obtained was arranged as shown in FIG. 2, and the visibility of the screen was evaluated.

The projector screen performance was as follows.
Brightness Poor Contrast Good Glitter Poor

  The screen of the present invention can be preferably used as a screen of a reflective projector.

1A to 1D are conceptual diagrams showing fibers having an optical interference function in the present invention. It is a simplified diagram showing the arrangement | positioning at the time of the performance evaluation of a projector screen.

Explanation of symbols

1: Projector screen 2: Adhesive 3: Glass (support base material)
4: Liquid crystal projector 5: Observer

Claims (15)

  A screen for receiving projection light having polarized light to display an image, the screen including a molded product formed by intersecting an absorbing polarizing fiber and a reflecting polarizing fiber. The absorptive polarizing fiber is
2. The screen according to claim 1, wherein the thermoplastic resin fiber (A) adsorbs the dichroic dye (a). The reflective polarizing fiber is
(B) A fiber composed of at least two types of thermoplastic resins and having an alternating layer-like cross-sectional structure, the alternating layer being 5 layers or more, and the thickness of each layer being in the range of 0.02 to 1.0 μm And at least the two thermoplastic resins are fibers (B) having an optical interference function in which a difference in refractive index at a wavelength of 589 nm in the cross-sectional direction with respect to the length direction of the fibers is 0.01 or less. The screen according to claim 2 . The molded article is
(C) It contains an optical transparent resin (C) having a refractive index substantially equal to the refractive index in the cross-sectional direction with respect to the length direction of the fiber (B), and the fiber (A) is arranged in a unidirectional plane. 4. The screen according to claim 3, wherein the fibers (B) are arranged in a plane shape orthogonal to the fibers (A). The molded article according to claim 1 or 2 screen, wherein the including the set to absorptive polarizing fibers the reflective polarizing fiber and the warp yarns, and one of the weft fabric. It said fibers (A) and (B) is screen according to claim 4, characterized in that encapsulated immobilized by the optically transparent resin (C). The screen according to claim 6, wherein the fiber (A) is a fiber made of a polyvinyl alcohol-based resin.   The screen according to claim 7, wherein the polyvinyl alcohol resin has a degree of polymerization of 1000 or more and 40000 or less and a degree of saponification of 80 mol% or more and 100% or less.   The screen according to any one of claims 7 to 8, wherein an average diameter of the polyvinyl alcohol-based resin fiber is 0.7 µm or more and 100 µm or less. The screen according to any one of claims 2 to 4 and 6 to 9, wherein the dichroic dye is iodine. The screen according to any one of claims 3 to 4, and 6 to 9 , wherein a difference in refractive index between at least two thermoplastic resins of the fibers (B) is 0.02 or more. Screen according to any one of claims 3-4, and 6-9 wherein the average diameter of the fiber (B), characterized in that at 0.7μm or 100μm or less. The screen according to any one of claims 4 and 6 to 9 , wherein the optically transparent resin (C) is a thermoplastic resin. The screen according to any one of claims 4 and 6 to 9 , wherein the optically transparent resin (C) is a curable resin.   Furthermore, the screen in any one of Claims 1-14 which has a metal reflective layer.

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