TW200949300A - Luminance-enhanced film - Google Patents

Abstract

The present invention relates to a luminance-enhanced film, and more particularly, to a luminance-enhanced film in which island-in-the-sea yarns with birefringence are included in a base material, thus significantly lowering production costs and also rapidly improving luminance. The luminance-enhanced film of the present invention includes a birefringent island-in-the-sea yarn within a base material. Accordingly, unlike a conventional stack type luminance-enhanced film, a luminance enhancement effect is excellent while not forming a number of layers. Further, since several hundreds of layers are not formed in one film, fabrication is very convenient and production costs can be saved greatly.

Description

200949300 IX. INSTRUCTIONS OF THE INVENTION: TECHNICAL FIELD OF THE INVENTION The present invention relates to a film for increasing the visibility, and more particularly to a film for increasing the visibility, wherein the island-in-the-coil having birefringence (island-in-the- Sea yarn) is included in the substrate and thus significantly reduces manufacturing costs and rapidly improves the visibility. [Prior Art] © The information display technology, the cathode ray tube (eath〇de犷machi tube, CRT) of the display device occupied a dominant position in the last half century. However, in line with the rapid advances in the information age, display technology requires a variety of methods. It is expected that flat panel displays will become a technology that outperforms CRT in the near future. Not only small-sized test sets, but also portable computers have been commercialized, and the existing crt method has been replaced by flat-panel display devices, even for a wide variety of monitors and televisions. In the flat display technology, liquid crystal display (LCD), projection display H, «Plasma display panel (PDP) has stabilized its market in the TV field, so it has become the mainstream. With the improvement of related technologies, it is also expected that a field emission display (fieid emissi〇n display ’ FED), an electroluminescence display (ELD), etc. will occupy one party according to individual characteristics. The range of use of liquid crystal displays has now expanded to notebook computers, personal computer monitors, LCD TVs, vehicles, aircraft, etc. LCD monitors account for approximately 80% of the flat panel market, and with the rapid increase in demand for 5 200949300 w-LCDs since the second half of 998, it has already shown its global glory. The liquid crystal display of the transfer and charge has a liquid crystal and an electrode matrix disposed between a pair of optical films that absorb light. In this liquid crystal display, the liquid crystal portion is moved by the influence of the electric field, and the electric field is charged by the application of the electric current to the two electrodes, and the optical state of the liquid crystal is changed accordingly. This process displays information by polarizing the "pixel" in a particular direction, and the pixel already carries information. To this end, the liquid crystal display sentence & soil invites ^ + left to cover the film and the rear optical film to induce this polarization. It is not said that the liquid crystal display device of such a liquid crystal display has high use efficiency for light emitted from a backlight. This is because 5% or more of the light emitted by the backlight is absorbed by the back optical film. Therefore, in order to increase the backlight use efficiency of such a liquid crystal display device, the film 遂 which increases the visibility is disposed between the optical cavity and the liquid crystal module. Figure 2 is a schematic diagram showing the principle of a conventional enhanced brightness film. In detail, the ρ-polarized light of the light directed from the optical cavity to the liquid crystal module is transferred to the liquid crystal module via the film which increases the visibility. The polarized light of light is reflected from the film of increased visibility to the optical cavity, which is re-reflected from the diffuse reflection surface of the optical cavity in a state where the polarization of light becomes random, and then transferred to the film which increases the visibility. Therefore, the S-polarized light is converted into ρ-polarized light which can pass through the polarizer of the liquid crystal module, and then transferred to the liquid crystal element via the film which increases the visibility. The selective reflection of S-polarized light and the transmission behavior of ρ-polarized light are performed as follows with respect to the light emitted by the human on the brightening film: the difference in refractive index between the individual optical layers, the extension process according to the stacked optical layer The optical thickness of each optical layer set to 6 200949300, the refractive index of the optical layer, a flat change, is in the following state: an optical layer on a flat sheet having an anisotropic refractive index and has an isotropic refraction The optical layers on the flat sheets are alternately stacked in a complex number. That is, light incident on the film of increased visibility undergoes reflection of S-polarized light and transmission of p-polarized light as it passes through each optical layer, so that only P-polarized light of incident polarized light is transferred to the liquid crystal module. Further, the reflected S-polarized light is reflected from the diffuse reflection surface of the optical cavity to a random state as described above, and then transferred to the film which increases the visibility. Accordingly, it is possible to reduce the loss of light generated by the light source 2 power waste. However, the conventional method for increasing the brightness of the film is to alternately stack the isotropic optical layer and the anisotropic optical layer on a flat sheet having a different refractive index, and to extend the stacked layer, so that the stacked layer is The individual optical layers have optical thickness and refractive index that are optimized for selective reflection and transmission of incident polarization. Accordingly, the problem is that the process for increasing the brightness of the film is complicated. In particular, since each optical layer of the film of increased visibility has a flat sheet structure, the P-polarized light and the s-polarized light must be separated from each other in order to accommodate a wide range of incident angles of the polarized light. Accordingly, the problem is that the number of stacks of optical layers is excessively increased, and the manufacturing cost is increased geometrically. In addition, the problem is that optical performance may be degraded due to optical losses caused by an excessive number of optical layer stacks. 7 200949300 SUMMARY OF THE INVENTION <Technical Problem> Accordingly, the present invention has been made in view of the above problems occurring in the prior art, and an object of the present invention is to provide a film having increased visibility, which is easy to manufacture and has a low manufacturing cost. And further improving the brightening effect by replacing the conventional stacked type film which increases the visibility. Another object of the present invention is to provide an increased clarity film having excellent visibility and optical effects. &lt;Technical Solution&gt; In order to achieve the above object, a film having a high visibility can include a sea-island yarn having birefringence in a substrate. The substrate preferably has optical homogeneity and a refractive index of 1 &gt; 4 to 2.0. More preferably, the substrate may be used in any one or more of the following: polyethylene naphthalate (PEN), copolymerized polyethylene naphthalate (co_PEN), polyethylene terephthalate (PET), poly Carbonate (PC), polycarbonate (pc) alloy, polystyrene (PS), heat-polymerized ethylene (ps), polymethyl acrylate vinegar (pmma) 'poly terephthalic acid Butane diester (PBT), polypropylene (PP), polyethylene (pE), acrylonitrile butadiene styrene (ABS), polyurethane (PU), polyimine (ρι), polyvinyl chloride (PVC), Styrene acrylonitrile mixture (San), ethylene vinyl acetate (EVA), polydecylamine (PA), polyacetal (POM), phenol, epoxy resin (Ep), urea (UF), black chapter (MF ), unsaturated polyester (UP), bismuth (SI), elastomer, cyclic olefin polymer. Preferably, the sea island yarn may be arranged in a plurality in the direction of the substrate. More preferably, the sea island yarn may be disposed perpendicular to the light source in the substrate. This 200949300 outer 'sea island yarn can be public &amp;&amp; = m or it can be placed in the substrate in the shape of the substrate / J knives scattered in the substrate, which is placed in contact with the substrate 1 The sea island yarn can be one or more layers. ^ and the refractive index of the sea island yarn (4) in the biaxial direction can be 疋G.G3 or less. More preferably, the difference in refractive index of the substrate in the -axis direction may be. .05 or greater The down-axis direction is the length direction of the island yarn in the sea. Better surplus

海 The sea part of the sea island yarn may preferably be uniform, and the island part of the sea island may preferably be anisotropic. The difference in refractive index between the sea portion and the island portion of the sea island yarn relative to the biaxial direction may preferably be 0.03 or less, and the sea portion and the island of the island yarn in the sea. The difference in refractive index of the file relative to the remaining one axis direction may preferably be 〇.〇5 or more. In this case, the remaining one axis direction may be the length direction of the island yarn in the sea. The sea portion preferably has a refractive index of 14 to 2 Torr. The island portion of the island yarn can be configured in plural. More preferably, the ratio of the area of the sea portion to the island portion based on the cross section of the island yarn may be 2: 8 to 8: The sea portion of the sea island yarn may preferably include any one or more of the following: polycaproterate (pEN), copolymerized polyethylene naphthalate (c〇_pEN), polyethylene terephthalate (PET), polycarbonate (Pc), polycarbonate (PC) alloy, polystyrene (PS) ), heat-resistant polystyrene (ps), polymethyl methacrylate CPMMA), polybutylene terephthalate (pbt), polypropylene (pp), polyethylene (PE), acrylonitrile butadiene benzene Ethylene (ABS), Polyurethane (PU), Polyamide 9 200949300 Amine (PI), Polyethylene (PVC), Styrene Acrylonitrile (SAN), Ethylene Vinyl Acetate (EVA), Polyamide (PA) Polyacetal (POM), phenol, cyclic oxime resin (EP), urea (UF), melanin (MF), unsaturated polyester (UP), bismuth (SI), elastomer, cyclic olefin polymer. The island portion of the island yarn may preferably include any one or more of the following: polyethylene naphthalate (PEN), co-PEN, PET, co_PET, polybutylene terephthalate (PBT), poly Propylene (pp). Further, the 'number of island portions may preferably have the same cross section or different cross sections. Even better, the island yarn can extend in the length direction. The film of increased clarity may further comprise a structured surface layer. More preferably, the structured surface layer is formed on a surface from which light can be output. DETAILED DESCRIPTION The structured surface layer can have a prism shape, a lens shape, or a convex lens shape. In this case, the shapes may be arranged regularly or irregularly. Birefringent sea island yarns may or may not be disposed in the structured surface layer. Further, the rear surface of the film which increases the visibility can be subjected to matt I treatment. The sea island yarn may preferably have a thickness of 0.3 to 2 denier. Increasing the number of sea island yarns in the clarity film is 500 to 4,000,000 per cubic centimeter. The wearing surface of the sea island yarn may be round, oval or a variety of non-circular shaped sea portions having a refractive index equal to the refractive index of the substrate. &amp; Nakajima, yarn can be woven at the weft yarn and the end. More preferably, any of the weft yarns and the ends may be island yarns, and the other of the weft yarns and the ends may be oriented fibers. 10 200949300 The weft and the end can be formed from 1 to 200 strands of sea-island yarn. At the same time, the present invention can provide a light-receiving unit including the above-described thinness of increased visibility. Further, the backlight unit may be included in the liquid crystal display device: In this case, the liquid crystal display device may include a phase difference film and/or absorption.

The film for increasing the visibility according to another aspect of the present invention includes a substrate whose refractive index in the z-axis direction may be nX1, and the refractive index in the direction of the vehicle may be nZ1 in the direction of the z-axis, and the sea of birefringence Nakajima yarn with t. When the birefringence sea island yarn (4) has a radiance of ηχ2, ηγ2, ηζ2, at least one of the x, y, and z-axis refractive indices of the substrate may be equal to the X, y, and z-axis refractive indices of the birefringent sea island yarn. In this case, it is more preferable that nX2 &gt; nY2 = nZ1, and the substrate is uniform. g, the refractive index of the axis of the island of the island of the sea, which can be the length of the island of the island of the sea, can be ηΧ3, the refractive index of the island of the island of the sea in the y-axis direction can be ηγ3, sea Nakajima Yoshishima Department: The refractive index in the x-axis direction may be ηΖ3 'and the X-axis of the sea portion of the island yarn in the sea: the refractive index may be ηΧ4, the y-axis direction of the sea portion of the sea island yarn is refracted ^ 疋η Y4 The refractive index in the z-axis direction of the sea portion of the sea island yarn may be =4', and the difference between the refractive indices η Χ 3 and η χ 4 or η γ 3 and ^ may be 0.15 or more. The difference between the refractive index and the heart is less than 〇.〇3. The vocabulary used in the manual is briefly described below. In the following case, unless otherwise stated, the polymer has birefringence, which means that the light irradiated on the polymer with different refractive indices according to the direction 200949300, the light incident on the polymer is refracted into two different directions. Light. "isotropy" - the word refers to the fact that when the light passes through the object, regardless of the direction of the light, the object has a fixed refractive index. Anisotropy—The word means that the optical properties of an object will vary depending on the direction of the light. An anisotropic object has birefringence, which is relative to the uniformity. The term "optical m〇dulation" refers to the refracted light being reflected, refracted, or altered in intensity, wave motion period or nature. &lt;Advantageous Effects&gt; The present invention is a film for increasing the visibility, in which a layer is formed to include a birefringent sea island yarn in a substrate, unlike a conventional stacked type film which increases the visibility. According to this, the film of increased brightness of the present invention can have an excellent effect of increasing the visibility without having to form a plurality of layers. Further, since hundreds of layers are not stacked in a film, it is very convenient to manufacture, and the manufacturing cost saving effect is extremely excellent. DETAILED DESCRIPTION OF THE INVENTION Further objects and advantages of the present invention will become more fully apparent from the detailed description of the appended claims. Specific aspects of the invention will be described in detail below with reference to the drawings. Conventional augmented films are manufactured by alternately stacking an isotropic optical layer and an anisotropic optical layer on a flat sheet having a different refractive index, and then extending the stacked layers so as to have between individual optical layers. Light 12 200949300 Pre-thickness and refractive index, which can be optimized for selective reflection and transmission of incident polarized light. Accordingly, the problem is that the process for increasing the brightness of the film becomes complicated. In particular, since each optical layer of the film of increased visibility has a flat sheet structure, p-polarized light and s-polarized light must be separated from each other in response to a wide range of incident angles of incident polarized light. Accordingly, the problem is that the number of stacks of optical layers is excessively increased, and the manufacturing cost is also increased geometrically. In addition to this, the problem is that optical performance may be degraded due to optical loss due to the excessive number of optical layer stacks in the structure. In view of the above problems, in the present invention, the birefringent sea-island yarn is disposed in the substrate such that the incident light from the light source is at the birefringent interface (ie, the boundary interface between the isotropic substrates of the island fibers in the birefringent sea) Reflection, scattering, and refraction occur, so they are optically modulated. According to this, the visibility can be quickly improved. In detail, the light emitted by an external light source can be broadly classified into S-polarized light and P-polarized light. In the case where only a specific polarized light is required, the p-polarized light passes through the film which increases the visibility without being affected by the birefringent interface. However, the 'S-polarized light is modulated at a wavelength in a random form such as refraction, scattering, reflection, etc., that is, at the birefringent interface, it is converted into S-polarized light or P-polarized light. If the modulated light is again reflected and illuminated on the film which increases the visibility, the P-polarized light passes through the film which increases the visibility, and the S-polarized light is again scattered or reflected. By repeating such a process, desired P-polarized light can be obtained. According to this, if the polymer having the birefringent interface is disposed in the substrate at a boundary interface between the polymer and the substrate, the film can be quickly improved even if the conventional stacked type film having increased visibility is not formed. Brightness. 13 200949300 In addition, the inventors have found that if a polycondensate having a birefringent interface is used as a general birefringent fiber, the advantage is that the manufacturing cost is low and the above is convenient, because a stacked film is not formed, but generally Birefringent fibers may not be used in the industrial field of replacing stacked-type films with increased visibility because the effect of increased brightness is not significant. In order to overcome the above problems, a birefringent sea island yarn is used as a polymer having a birefringent interface. In particular, it has been found that the effect of optical modulation efficiency and brightness increase is significantly improved if birefringent sea island yarns are used compared to the use of typical fiber φ. In particular, the island portion constituting the island yarn of the sea has birefringence, and the sea portion of the divided island portion has an average orientation. In this case, not only the boundary interface between the sea island yarn and the substrate but also the boundary interface between many island portions and the sea portion inside the sea island yarn have a birefringent interface. Accordingly, the effect of the optical modulation is increased by one compared to the typical birefringent fiber in which the birefringent interface is formed only at the boundary interface between the substrate and the birefringent fiber. Because of &amp;, the bismuth birefringent sea island yarn of the present invention can replace the stacked type of film which increases the visibility and can be practically applied in the industrial field. Accordingly, when birefringent sea-island yarns are used, the efficiency of increasing the visibility is superior to that of the typical birefringent fibers. Further, the birefringent sea island yarn includes an island portion and a sea portion which have different optical properties and a birefringent interface and can be formed in the sea island yarn. Therefore, the present invention can significantly improve the efficiency of increasing the visibility as compared with the case where the birefringence interface is not formed in the sea island yarn. Further, the conjugate is formed in the number of tens or tens of sea island yarns. In the case of joining 200949300 fibers, for example, '10 nautical island yarns are formed to form a conjugated fiber, and there are (10) birefringent interfaces in the enamel bonding fiber, which can produce 1 〇〇 or more. Optical modulation. In addition, in the case of producing a plurality of twisted-type sea-in-the-sea yarns, for example, when manufacturing one strand of sea-in-the-sea yarn, the 扼(10) birefringent interfaces in the fibers are joined together, and (10) or more can be produced. Multiple optical modulation. The sea island yarn of the present invention can be produced by a co-extrusion method or the like, but is not limited thereto. Ο

Therefore, it is possible to manufacture microfibers. The typical sea island yarn uses the island portion as a microfiber, which is left after the elute sea portion, regardless of birefringence. In the towel of the present invention, although the sea portion of the sea-island yarn is not washed, the sea-island yarn having the optical properties of the sea portion and the island portion is used as it is. In the present invention, it is assumed that the island portion has an anisotropy and the sea portion has an isotropic property. However, the object of the present invention can be achieved even when the island portion has an isotropic property and the sea portion has an anisotropy. The invention will be described in detail with reference to the drawings. Figure 2 is a schematic cross-sectional view of an enlarged elevation film in accordance with an embodiment of the present invention. In detail, the film of increased visibility has a sea island yarn 2 1 〇 which is birefringent and freely arranged in the oriented substrate 200. Materials that can be used with substrate 200 at this point include thermoplastic and thermoset polymers, and the optical wavelengths of the target range can pass through the polymer. Preferably, a suitable substrate 2 can be amorphous or semi-crystalline and can comprise a single polymer, copolymer or blend thereof. In detail, it is possible to use: polycarbonate (PC); opposite rows and the same row of polystyrene (PS); alkyl styrene; alkyl, such as polymethyl methacrylate (PMMA) and PMMA copolymer, Aromatic and aliphatic drape 15 200949300 (meth) acrylate; ethoxylated and propoxylated (meth) acrylate; polyfunctional (fluorenyl) acrylate; acrylated epoxy; epoxy; Ethylene unsaturated substance; cyclic olefin and cyclic olefin copolymer; acrylonitrile butadiene styrene (ABS); styrene acrylonitrile copolymer (SAN); epoxy resin; polyethylene cyclohexane; PMMA / polyfluorine Ethylene blend; polyoxybenzene alloy; styrene block copolymer; polyimine; polysulfone; polyvinyl chloride; polydimethyl siloxane (PDMS); polyurethane; unsaturated polyester; Polypropylene (PP); polyalkylene terephthalate, for example, polyethylene terephthalate (PET); poly-p-naphthalene dicarboxylate, for example, polynaphthalene Diethyl acrylate; polyamine; ionic polymer; vinyl acetate/polyethylene copolymer; cellulose acetate; Butyl cellulose; fluoropolymer; polystyrene - polyethylene copolymer; PET and PEN copolymers, such as polyolefins and PET PEN; polycarbonate / aliphatic PET blends. More preferably, it can be used singly or in combination: polyethylene naphthalate (PEN), copolymerized polyethylene naphthalate (co-PEN), polyethylene terephthalate (PET), poly Carbonate (PC), polycarbonate (PC) alloy, polystyrene (PS), heat resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT) ), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene (ABS), polyurethane (PU), polyimine (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polyamine (PA), polyacetal (POM), phenol, epoxy resin (EP), urea · melanin (UF.MF), unsaturated polyester (UP ), bismuth (SI), elastomer, cycloolefin polymer (COP, 曰本ΖΕΟΝ, Japan JSR). Furthermore, the substrate may also contain additives such as antioxidants, light stabilizers, heat stabilizers, lubricants, dispersions 16, 200949300, UV absorbers, white pigments, and scent whites, as long as they are not damaged. The above physical properties. The material that the sea &quot;island yarn 210 can employ preferably has optical birefringence and excellent optical transmission. Preferably, although the sea island yarn 21 can have the same material as the base #200, the optical properties of the material used are birefringent. Further, a method of converting an isotropic material into a birefringent material has been generally known. For example, 'if the uniform material is suitable Ο

When stretched under temperature conditions, the isotropic material will orient its polymer molecules and will therefore have birefringence. More preferably, one or more of the following may be used: polyethylene naphthalate (PEN), polyethylene naphthalate (c〇_pEN), polyethylene terephthalate (PET) ), copolymerized ethylene terephthalate (c〇_pET), polycarbonate (pc), polycarbonate (PC) alloy, polystyrene (ps), heat-resistant polystyrene (PS), polymethyl Methyl acrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (pE), acrylonitrile butadiene styrene (ABS), polyurethane (PU), polypyrene Amine (ρι), polystyrene ethylene styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polydecylamine (PA), polycondensation (p0M), phenol, epoxy resin (Ep), urea Melanin (UF, MF), unsaturated polyester (UP), strontium (SI), elastomer, cycloolefin polymer 'as part of the sea and island. In this case, the sea portion and the island portion S may have an orientation, and the other of the sea portion and the island portion may have an anisotropy. More preferably, the island portion may be anisotropic and the sea portion may have an orientation. For example, the sea portion of the sea island yarn can use the uniformity C0_PEN, while the island portion can use the birefringence 17 200949300 PEN. Resins with different optical properties can be used in both the sea and island parts of the island yarn. In addition, in a sea-island yarn having an optically oriented substrate and birefringence, depending on the degree of substantial matching or mismatch of the refractive indices of the x, y, and z axes of the space, the degree of light scattering is affected, and the light is affected. That is, according to the corresponding polarization. In general, the change in scattering power is proportional to the square of the degree of refractive index mismatch. Accordingly, if the degree of mismatch of the refractive index according to the specific axis increases, the light polarized according to the corresponding axis is more strongly scattered. However, when the degree of mismatch according to a particular axis is small, the light polarized according to the corresponding axis scatters less. In the case where the refractive index of the substrate according to a specific axis is substantially equal to the refractive index of the island yarn in the sea, the incident light polarized by the electric field parallel to the axis does not scatter, regardless of the size, shape and density of a part of the island yarn in the sea. However, incident light can pass through the island yarn. Furthermore, in the case where the refractive index of the substrate according to a particular axis is substantially equal to the refractive index of the island yarn in the sea, the light does not substantially scatter but passes through the object. Accordingly, in the present invention, the difference in refractive index of the tantalum substrate and the sea-island yarn with respect to the biaxial direction is preferably 0.03 or less, and the refractive index of the substrate and the sea island yarn relative to the remaining one axis direction. The difference is 0.05 or more. In this case, the ρ wave passes through the birefringent interface of the substrate and the island yarn in the sea. However, the s-wave undergoes optical modulation, is reflected, scattered, or refracted, and then converted into an S-wave or a p-wave. The p-wave again passes through the film that increases the visibility and undergoes optical modulation. In particular, the island portion of the 'birefringent sea island yarn may preferably have an anisotropy' and the sea portion may preferably have an anisotropy. It is assumed that the refractive index of the anisotropic island portion in the X-axis direction is nX3, the refractive index of the anisotropic island portion in the y-axis direction is 200949300, the refractive index is nY3, and the refractive index of the anisotropic island portion in the z-axis direction is nZ3, and both The refractive index of the slanting sea portion in the x-axis direction is nX4, the refractive index of the isotropic sea portion in the y-axis direction is nY4, and the refractive index of the isotropic sea portion in the z-axis direction is nZ4, and the refractive indices nX3 and nX4 The absolute value of the difference between the two is preferably 〇. 〇 5 or greater, and more preferably 〇 15 or greater. In this case, the absolute value of the difference between the refractive indices η Υ 3 and η Υ 4 and / or η Ζ 3 and the like may be less than 0.03.

It is better that in the case where the island yarn is stretched in the X-axis direction, the absolute value of the difference between the refractive indices η χ 3 and η Χ 4 may be 〇〇 5 or more, and (4) = ΠΥ 3 # η Υ 4 and η Ζ 3 # The absolute value of the difference between 〇ηΖ4 can be less than 〇_〇3. In this case, it is advantageous to increase the optical modulation efficiency. In this case, nX3 &gt; nY3 = ηΖ3 can be caused. Preferably, the island portion may comprise a fiber jacket to surround the fiber core. The increased: dioptric film may preferably comprise a plurality of optically modulated fibers with a 5 t section and one or more filler and island portions may comprise Double pounds of polymer (such as birefringence cholesterol). Further, - or more of the optically modulated fibers and island portions may preferably be stretched in the length direction. Regarding the shape of the birefringent sea island yarn of the present invention, the cut of the sea island yarn has an arbitrary shape depending on the purpose, and may have various t-circular cuts, for example, a circle, a (four), and a polygon. In a similar way: the island section of the island yarn can have a non-circular cross section, such as a circle / (four), a polygon, regardless of its shape category. |^| 3 to _/ 1 1 is a side view of a birefringent sea island yarn according to a specific aspect of the present invention. As can be seen from Fig. 3 to &quot;&quot;, in the present invention, the shape and size of the island portion can be efficiently controlled according to its 19 200949300 optical modulation purpose = ... typical sea island yarn 3. . A cross-sectional view in which approximately two = divisions are distinguished by sea portion 310a. Figure 4 is a cross-sectional view of the island yarn in the sea, which makes the area of the sea part more than the area of the island part ship. Fig. 5 is a cross-sectional view of an island yarn in the sea, in which the shape of the island yarn in the sea is a printed shape. In Fig. 6, the island portion is measured as (4), and the island portions 32〇d are arranged in a zigzag manner. ❹ ❹ ❹ ’ ′′ Although the cross-section of the sea-goal island yarn has a rectangular structure, it may have a polygonal structure or a non-circular cross section. As shown in Figures 7 and 8, the island Qiu Ba Λ _ _ 士, , # ^刀32 (^ can be located in the sea in the island yarn, or the sea part 310f can be located in the center of the sea island yarn. : Some specific states The 'island portion may not have the same ruler 1 and... as exemplified in Figures 9 and 10, the sea island yarn may include the island portion g 32lg' having a different cross-sectional dimension. The specific embodiment (10)g) may have another than the island portion - (called) relative: large cross section. The island part can correspond to two or more sets of different feet: two and can have different sizes of real f. Again, as shown in the figure, 1 and / Or the average coverage 33Gi can be added to the island portion 320i. Each of the several island parts can be arranged in the sea island yarn, and the area ratio of the island to the island portion can preferably be 2:8 to 8:2. The sea = with ' ° · · &quot; 0 Danny thickness, and &quot;. Into the substrate. = (the number of mother cubes) The sea island yarn is preferably disposed in the λ of the film. The refractive index of the sea portion can be equal to the refractive index of the substrate having a thinner apparent brightness. In addition, the light that penetrates the birefringent sea island yarn in the substrate can be optically modulated at the bi-fold 20 200949300 interface, as described above. In particular, Figure 12 is a cross-sectional view of a light path through the birefringent sea island yarn of the present invention. In this case, the p-wave (solid line) passes through the birefringent sea island yarn 400 without being subjected to the birefringent interface (i.e., the boundary surface between the substrate and the birefringent sea island yarn 400 and the birefringent sea island yarn 400). The boundary surface between the island portion 420a and the sea portion 410a is affected by 'but the S wave (dashed line) is at the birefringent interface (i.e., the boundary surface between the substrate and the birefringent sea island yarn 400 and/or the birefringent sea) Nakajima Yarn 4〇〇

The boundary surface between the island portion 420a and the sea portion 410a is optically modulated. ..., most of the S waves return to the source via optical modulation (such as reflection, scattering or refraction). The returned s wave becomes s-wave or P-wave again after reflection and then passes through a film that increases the visibility. According to this, if the birefringent sea island yarn is used as described above, the efficiency of increasing the visibility is superior to the case of using the typical birefringent fiber. The birefringent sea island yarn comprises an island portion and a sea portion 'which have different optical properties so that the birefringent interface can be formed in the sea island yarn. Accordingly, the efficiency of the present invention for increasing the visibility can be significantly increased as compared with the case where the birefringence interface is not formed in the sea island yarn. In addition, several sea-in-the-sea yarns can be stretched in the - direction and placed in the soil to better the sea bream yarn 21 〇 1 to be placed in the substrate perpendicular to the source. In this case 'τ to maximize the optical modulation efficiency. On the other hand, if the appropriate 祛 也 也 的 的 的 的 的 的 的 的 的 的 的 的 的 的 的 Si Si Si Si Si Si Si Si Si Si Si Si Si Si Si Si Si Si 210 210 210 210 210 210 210 210 210 Si Si They can be arranged in a tightly formed form. 21 200949300 Furthermore, for example, if three or more sea island yarns having different circular cross-sections are arranged, the three circular centers adjacent to each other in the cross section perpendicular to the long axis direction are obtained. The triangle becomes an inequilateral triangle. Further, in the section (cylinder) perpendicular to the long axis direction of the island yarn in the sea, the arrangement of the cylinder causes the circular shape of the first layer to contact the circular shape of the second layer. However, with respect to each of the island yarns, as long as the following conditions are satisfied: "Every sea island yarn is in contact with two or more different sea island yarns" which are in contact with each other on the side of the cylinder. In this range, for example, in a structure in which the circular shape of the first layer and the circular shape of the second layer contact each other, the circular shape of the second layer and the circular shape of the third layer are inserted into each other. It is also possible that the support media are separated, and the circular shape of the third layer and the circular shape of the fourth layer are in contact with each other. The triangles of the three circular centers that are directly in contact with each other in a section perpendicular to the long axis direction of the island yarn in the sea are preferably at least about the same side length. In particular, the three side lengths of the triangle are preferably about the same. In addition, regarding the stacking state of the sea-island yarn in the thickness direction of the bright-view film, the stacking of the plurality of layers is preferably sequentially in contact with each other. Furthermore, sea island yarns having cylinders of almost the same diameter are more preferably tightly packed. Accordingly, in this preferred form, the plurality of sea-in-the-sea yarns have substantially the same cylindrical shape in a circular diameter in a section perpendicular to the long-axis direction thereof, and the position in the cross-section is more inside than the outermost surface layer. The island yarns in the sea are in contact with the birefringent body, that is, six different cylinders are on the side of the cylinder. Further, it is preferable to use a film having a large brightness of 1 cubic centimeter, preferably 22 200949300. It is advantageous that the birefringent sea island yarn accounts for i% by volume to 9 g% by volume. If the Nakajima yarn is 1% or smaller, the effect of increasing the visibility is not significant. If the volume of the island yarn in the sea is 9〇% or more, there may be a problem. This is because the birefringence interface causes scattering and thus causes optical loss.

Furthermore, the 500-to-bar birefringent sea-island yarn can be placed in a film of 1 cubic centimeter of increased visibility. The cross-sectional diameter of the island portion in the birefringent sea island yarn can also have a significant effect on optical modulation. If the birefringence = the cross-sectional diameter of each island portion in the mid-island yarn is smaller than the optical wavelength, the refraction, scattering, and reflection effects are lowered', so that optical modulation is hardly produced. If the cross-sectional diameter of the island portion is too large, the light will undergo regular reflection from the surface of the island yarn in the birefringent sea and the diffusion in other directions will be extremely insignificant. The cross-sectional diameter of the aligned island portion can vary depending on the intended use of the optical object. For example, the diameter of the fibers can be highly correlated with the wavelength of the electromagnetic radiation, which is important for a particular application and requires fibers of different diameters to reflect, scatter or penetrate visible light, ultraviolet light, infrared light, microwaves. Preferably, the film which increases the clarity can comprise a structured surface layer depending on its purpose. 13 through 18 are cross-sectional views of a structured surface for increasing the clarity film in accordance with an embodiment of the present invention. In Fig. 13, the incident surface and the exit surface of the increased brightness film may be parallel to the light emitted by the light source 5a. In this case, as shown in FIG. 14, the birefringent sea island yarn 52 1 b located on the light source 5001) (adjacent to the light source 5〇〇b) can be closely arranged 'and away from the light source 5〇〇b The refracted sea island yarn 520b can be loosely arranged. A structured surface layer can be formed on the surface of the output light. The structured surface layer may have a serpentine shape, a lens shape or a convex lens shape. In particular, 23 200949300 In Fig. 15, the surface of the output light on the brightening film may have a curved surface 53 0c ' which is a convex lens shape. The curved surface 530c can focus or defocus the light passing through the surface. Further, as shown in FIG. 16, the 稜鏡 pattern 530d may be formed on the light exit surface. In this case, the birefringent sea island yarn 52〇d may not be formed on the structured surface layer 53 0d as shown in FIG. 16; the birefringent sea island yarn 520e may be simultaneously formed on the substrate and the surface layer 53〇e, such as Figure 17

No; or the birefringent sea island yarn 52〇f may be formed only on the structured surface layer 53 Of, as shown in FIG. The uneven portion can be formed on the rear surface of the film of the augmented brightness by the matting treatment, which can impart scratch resistance. This can be done without causing adverse effects to the present invention. Further, the light transmitted from the light source may include natural light and polarized light, and several materials having birefringence may be used as the birefringent sea island yarn. However, from the viewpoints of pointing, cross-sectional shape stability, durability, etc., the birefringent sea-island yarn is preferably solid. As shown in Figures 19 and 20, the sea island yarns are preferably woven using weft yarns 61〇 &amp;, 6〇〇b and warp yarns 600a, 610b. Any of the weft and warp yarns may be sea island yarns, and the other of the weft yarns and warp yarns may be oriented fibers. Preferably, the weft or warp yarn can be made into a seaweed yarn of a line of coffee. The birefringent sea island yarn of the present invention is formed in a direction to form a braid or a bobbin. It can be carried out by a known method or the weaving process of the braid or the bobbin can be spun and stretched, and the rear and back penetration of the substrate and the solidification of the yarn in the sea island yarn can be carried out. It is not particularly limited to this. When the 24 200949300 woven fabric or bobbin &amp; is infiltrated with the substrate and fixed, the following method or the like may be used. The non-woven fabric is immersed in the monomer and/or oligomer solution (ie, the substrate 4). Driving, then using light and/or heat to polymerize the ruthenium drive of the support medium; soaking the braid or the polymer solution of the bobbin to the support medium, then removing the cold agent, making the support medium into a fine powder, making the fine The powder is impregnated into the braid or spool and then melted. ❹

Further, in another approach, the invention can be practiced using a melt extrusion process. In detail, if the cross section perpendicular to the long axis direction of the birefringent sea island yarn dispersed in the substrate is a polygon, the following contour extrusion method may be employed, which divides the discharge drawing of the extruder into several restrictions. In the region, the resin constituting the birefringent sea island yarn is extruded from each spinneret into a polygonal shape, and the resin constituting the substrate is drawn from the (four) filaments (four) between the spinnerets. If the cross section perpendicular to the long axis direction of the birefringent sea island yarn dispersed in the support medium is substantially circular, the following contour extrusion method may be employed: the extruded (four) release outlet ί is divided into several spinnerets, and The resin constituting the birefringent sea island yarn is extruded into a cylindrical shape from a continuous spinneret in a cross section and constitutes a resin of the substrate from the filament head (four) between the spinnerets. In such cases, the extruder and the restriction zone can be designed such that different types of melted resin are alternately extruded from the spinneret of the extruder in a particular form, thereby forming the above-described dispersed arrangement. Further, the present invention can provide a film which increases the visibility of the aforementioned invention, and can also provide a liquid crystal display device including the backlight unit. In this case, the liquid crystal display device may be a phase difference film and/or an absorbing polarizing film. 25 200949300 As a result, in the case of using birefringent sea-island yarns, which include an anisotropic island portion disposed in the isotropic sea portion in a film having increased visibility, as a birefringent fiber, not only the substrate and the double The optical modulation effect is produced between the refraction of the island yarns in the sea, and the optical modulation effect is also produced between the anisotropic island portion and the isotropic sea portion in the birefringent sea island yarn. Accordingly, the optical modulation effect of the enhanced brightness film can be significantly increased. In particular, after the yoke-bonded fibers are formed by the warp yarns in the sea, they are woven into the form of the ends and the weft yarns and are disposed in the film which increases the visibility, and an excellent optical modulation effect can be obtained, which is not the use of typical birefringent fibers. Can compare. &lt;Invention Modes&gt; The present invention will now be described in detail in conjunction with specific aspects and experimental examples. The following specific examples and experimental examples are merely illustrative of the invention, and the scope of the invention is not limited to the specific examples and experimental examples. &lt;Specific Aspect 1&gt; ^ 37 island portions composed of anisotropic PEN (nx=i.88, ny=1.57, nz=1 57) are arranged in the uniformity co-PEN (nx=i.57) ,ny=157 '

‘1.57) made in the filler. The composition was subjected to the following conditions: the untwisted yarn 150 / 24, the spinning temperature was 305 t, the spinning speed was 1,500 m per minute, and the drawn yarn was obtained 5 times/24 after three times of stretching. The sea island yarn manufactured at this time contains 37 island parts composed of anisotropic ΡΕΝ (ηχ=1 88, machi = ι Μ, ηζ~1·57), which is arranged in the uniformity c〇_pEN =X =1·57' ny=1·57' nz=1.57) in the filling. The sea-island yarn made of 4 2 strands (because of 24 strands of raw yarn as a group, the true number of fiber strands is 100,800 strands, ie 4,200x24) is wound in parallel on the millimeter line 26 200949300 shaft. The spools are placed on Pc alloy sheets whose back surface has been matted and then stacked using specific tension. Here, the refractive index of the PC alloy sheet was 1.57. Thereafter, a mixed ultraviolet curable coating resin (having a refractive index of 154) made of epoxy acrylate and amine acetoacetate acrylate was coated on the fiber-stacked PC alloy sheet and introduced into the mirror roll. 'Then then undergoing major and minor UV hardening processes, thereby producing blended sheets in which birefringent sea island yarns are stacked. Although the coating resin exhibited a refractive index of 丨·54 before the outer coating of the enamel coating, the refractive index after curing was 1.57. Based on this fact, a film of increased brightness of 4 〇〇 micron was produced. &lt;Specific Aspect 2&gt; is the same as the specific aspect! The way to make a thickness of 4 〇〇 micron increases the brightness of the film 'except for the number of island portions is 217. &lt;Specific Aspect 3&gt; A film having a thickness of 400 μm and an increase in Θ Θ is produced in the same manner as in the specific aspect 2, except that the sea-island yarn for the specific aspect 2 undergoes four-human conjugate bonding. (50 / 24x4) to get 2 〇〇 / 96 raw yarn before using. &lt;Specific Aspect 4&gt; In order to simplify the process in which the fibers used in the specific aspect 2 are mixed with the PC sheet, 4'200 strands are woven, and the bobbin is used to obtain a weft density of 5 strands per inch, = 4 windings, In order to arrange them in parallel by a reduction of W mm, as described in detail Μ 1. The fabric is subjected to a flat weave to minimize the weft density. The manufactured braid is released from the sheet extrusion die while the stack 27 200949300 is stacked on the pc sheet, as described in the specific aspect 1, and then coated with a coating agent and hardened. A film of increased brightness of 400 microns is produced. &lt;Specific Aspect 5&gt; In order to improve the optical use efficiency of the high-definition film, the structured surface layer was formed on the enlarged vision film of the specific aspect 3. An augmented film having a thickness of 4 μm was produced in the same manner as the specific pattern 3 except that a ruthenium pattern was rolled during the blending sheet process to form a structured surface layer. ❹ &lt;Comparative Example 1 &gt; A film having a thickness of 400 μm for increasing the degree of refraction was produced in the same manner as in the specific aspect 1 except that an unstretched oriented fiber 丨 / 24 ' was used by C0_PEN ( Nx=ny=nz=l 57) is constructed instead of birefringent sea island yarn. &lt;Comparative Example 2&gt; A film having a thickness of 400 μm and an increase in % visibility was produced in the same manner as in the specific aspect 1 except that an unstretched yarn having an island structure in the sea (including 24 island portions) was used. And consists of pET (nx=ny=nz=i 5 and c〇-PEN (nx=ny=nz=l 57). &lt;Comparative Example 3:&gt; The PEN resin of IV 0.53 was polymerized. Non-refractory yarns of 1 50 / 24 are produced after the birefringence of the sea island yarn. The twisting is performed using the following conditions: spinning temperature 3051, spinning speed 1500 ft. per minute The undrawn yarn, which is said to be a ruler, is stretched three times at a temperature of 150 ° C, thereby producing a 50 / 24 drawn yarn. The stretched pen fiber 28 200949300 shows birefringence, And the refractive index in each direction is nx=188, ny=i 57, nz=1.57. A film of increased brightness of 400 micrometers is produced in the same manner as in the specific aspect 1, except that the birefringence PEN is contained. Fiber, not the sea-island yarn of the specific aspect 1. &lt;Experimental example&gt; The selection made according to the specific aspects 1 to 5 and the comparative examples 1 to 3 The film of the apparent brightness was evaluated for the following physical properties, and the results are shown in Table 1. 1 · Brightness In order to measure the apparent brightness of the manufactured high-vision film, the following test was carried out. After assembling the panel on a 52-inch direct-illumination backlight unit with a diffuser and a high-definition film, the bm-7 tester (TOPCON, Korea) was used to measure the brightness at 9:00 and the average value was listed. The penetration is measured according to the ASTM D2003 method, and the penetration is measured using a COH500A analyzer (NIPPON DENSHOKU, Japan) 3. Polarization degree of polarization is measured using a RETS-200 analyzer (OTSKA, Japan) 4^° 4. Humidity absorption Factor According to ASTM D5 70, the film with increased clarity is immersed in water at 23 ° C for 24 hours, and then the change in weight % before and after the process is measured. 5_ 片 sprout (sheet sprout) The film with increased clarity is assembled at 52 The backlight unit of the inch is then left at 29 200949300 60 ° C, 75% under constant temperature and humidity conditions for 96 hours' and then dissolved to visually observe the buds produced by the film of increased clarity. The results of the observation are 〇, △, &gt;&lt;Remarks. (〇: Good normal, X: Poor) 6. UV-resistant properties increase the visibility of the film using SMDT51H (Korea SEI MYUNG VACTRON Co., Ltd.) 130 mW output UV lamp (365 nm) Irradiation for 1 minute at a height of 10 cm. Γι (YeU〇w 前后 before and after this process was measured using an SD-5000 analyzer (NIPPON DENSHOKU, Japan)

Index, yellow index), and evaluate its yellowness index. [Table 1]

From Table 1, it can be seen that the specific aspect 丨 to 5 includes an enlarged vision film comprising double yarns, the optical properties of which are far superior to those of Comparative Examples 1 and 2 including the average island 30 200949300 dimension. It can also be seen that the specific aspect 1 to 5 includes a double-folded sea-island-enriched high-definition film which is far superior in optical properties to Comparative Example 3 including birefringent fibers. &lt;Industrial Applicability&gt; The film of increased brightness of the present invention can be widely used for liquid crystal display devices, for example, mobile phones and LCDs requiring high visibility. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing the principle of a conventional film for increasing the visibility; FIG. 2 is a schematic cross-sectional view showing a film for increasing the visibility according to a specific aspect of the present invention; 81 3 to 11 are according to the present invention. Fig. 12 is a perspective view showing a light path incident on a birefringent sea island yarn of the present invention; Ο Figs. 13 to 18 are enlarged vision films of the present invention. A cross-sectional view of the structured surface; and Figures 9 and 20 show the arrangement of birefringent optically modulated fibers in accordance with an embodiment of the present invention. [Main 2〇〇21〇3〇〇Required Symbol Description] Substrate Haizhong Island Yarn Island Yarn 31 200949300 310a, b, c, d, e, f, g, h, i Sea part 320a, b, c, d, e, f, g, h, i island portion 321g island portion 330i sheathing 400 sea island yarn 410a sea portion 420a island portion 500a 'b light source

510a' b Substrate 520a, b, c, d, e, f Sea island yarn 521b Sea island yarn 530c Curved surface 530d 稜鏡 pattern 530e, f Surface layer 600a Warp 600b Weft 610a Weft 610b Warp BLU Backlight unit PP polarized light SS Polarized light 32

Claims (1)

200949300 X. Patent application: 1. A film that increases the visibility, including a birefringent sea-island yarn in the substrate. 2. A film of increased clarity as in claim 1 of the patent application, wherein the substrate has an average orientation. 3. The film of the invention of claim 2, wherein the substrate comprises one or more selected from the group consisting of polyethylene naphthalate (PEN), copolymerized naphthalene Diethyl citrate (c〇_pEN), polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (ρ〇 alloy, polystyrene (PS), heat resistant polystyrene (Ps), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene (ABS), polyurethane (PU), polyimine (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polyamine (PA), polyacetal (p〇M ), phenol, epoxy resin (Ep), urea (UF), melanin (MF), unsaturated polyester (up), cerium (si), elastomer, cyclic olefin polymer. 〇 ^ 4. The film of the second aspect of the invention, wherein the refractive index of the substrate ranges from 1.4 to 2.0. 5. The film of the invention of increasing the visibility according to the scope of the patent application, wherein the sea island yarn is In the direction of the material, it is arranged in plural. 6. For the film of increased visibility in item 1 of the patent application, wherein the sea island yarn is arranged perpendicular to the light source in the substrate. 7_Additional item 5 of the patent application scope A large-viscosity film in which sea-island yarns are randomly disposed in a substrate. 33 200949300 8. A film of increased clarity as disclosed in claim 5, wherein the sea-island yarns are in contact with each other in the substrate. 9. For example, in the case of increasing the clarity of the film in item 5 of the patent scope of the application, the medium-sea island yarn forms one or more layers of β 10 in the substrate. Degree film, wherein: the difference in refractive index between the substrate and the sea island yarn relative to the biaxial direction is 0. 〇 3 or less, and The difference in refractive index between the substrate and the sea island yarn relative to the remaining-axis direction is 0.05 or more. 11 · As for the film of increased visibility of the first paragraph of the patent application, the remaining axis direction is the length direction of the sea island yarn. 12. For example, the film of the invention of claim 1 increases the brightness of the film, wherein the number of sea-island yarns in the high-definition film is 500 to 4,000,000 per cubic meter, of which 13·such as the patent application The film of the i-thin which increases the visibility, the sea-island yarn has a circular or printed cross section in the longitudinal direction. 14. The sea-island yarn has a non-circular cross section in the longitudinal direction as in the invention of the invention for increasing the brightness of the film of item i. The film of the item of increased visibility, 1 5. If the sea part of the first sea of the island yarn is the uniformity, such as the first part of the patent range, the island part of the sea island yarn is anisotropic. · For example, in the film of the scope of the patent of the invention, the difference between the sea portion and the island portion of the sea-island yarn with respect to the biaxial direction of the refractive index 34 200949300 is 0.03 or less, and = island yarn The difference between the sea portion and the island portion with respect to the remaining one axis is 0.05 or more. I8· For example, in the patent application, item 17 of the large-definition film, the remaining-axis direction is the length direction of the sea-island yarn. 19. A film of large apparentness as in claim 17 of the patent application, wherein the sea portion has a refractive index of 1.4 to 2.0. Ο 〇’ such as the patent scope of China! A film of increased visibility, wherein the island portion of the island yarn is arranged in plural. 21. For example, the application of the patent ϋ 帛 ; ; ; ; ; ; ; 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大22. The method of claim 3, wherein the sea portion of the sea bream comprises one or more selected from the group consisting of: polyethylene naphthalate (PEN) ), copolymerized naphthalene dicarboxylate _ (C〇-PEN), polyethylene terephthalate (PET), polycarbonate (PC), polyurethane (PC) alloy, polystyrene (Ps) ), heat-resistant polystyrene (ps), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene benzene Ethylene (ABS), polyurethane (PU), polyimide (pi), polyethylene (pvc), styrene acrylonitrile (SAN), ethylene vinyl acetate (EVA), polyamine (pa), poly Acetal (POM), phenol, epoxy (EP), urea (UF), melanin (MF), unsaturated polyester (UP), hydrazine (SI), elastomer, cyclic olefin polymer. 23. For example, increase the brightness of the film according to item 1 of the patent scope, 35 200949300 Ο The island portion of the island yarn is anisotropic and includes any one or more selected from the group consisting of polyethylene naphthalate (ΡΕΝ), copolymerized naphthalene dicarboxylate (co-PEN). , polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PC) alloy, polystyrene (PS), heat-resistant polystyrene (PS), polymethyl methacrylate ( PMma), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene benzene (ABS), polyurethane (PU), polyimine (PI), Polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polydecylamine (PA), polyacetal (POM), phenol, epoxy resin (Ep), urea (uf ), melanin (MF), unsaturated polyacetate (UP), hydrazine (SI), elastomer, cyclic olefin polymerization. 24. A film of increased clarity as disclosed in claim 2, wherein the plurality of island portions have the same cross section. 25. A thin medium with increased visibility as disclosed in Section 2 of the patent application, wherein several island portions have different cross sections. 26. A film of increased clarity as claimed in claim 1 wherein the substrate comprises a plurality of sea island yarns having different cross-sectional shapes. 27. If you apply for the beta patent range! A film of increased visibility, wherein the island yarn extends in the length direction. A film of increased brightness in the first item. Further, the first step of the patent application includes a structured surface layer. 29. The structuring surface layer of the 228th aspect of the application is formed in the output light. The structural surface layer has a prism shape. The item increases the apparent brightness of the film, on the surface. Among them, a film having an increased visibility, wherein 36 200949300 ❹ 1. A film of increased visibility as disclosed in claim 30, wherein the structured surface layer has an irregular 稜鏡 shape. 3 2. A film of increased clarity as disclosed in claim 28, wherein the structured surface layer has a lens shape. 33. A thin enamel for increasing visibility as disclosed in claim 32, wherein the structured surface layer has an irregular lens shape. 34. A film of increased clarity as in claim 33, wherein the structured surface layer has a convex lens shape. The film of the invention of claim 34, wherein the structured surface layer has an irregular convex lens shape.雒36', as in the application of claim 28, increases the brightness of the thin enamel, wherein the refracted sea island yarn is or is not disposed in the structured surface layer. 7' The thinning of the apparent brightness of item 28 of the _ 5 green patent range, wherein the rear surface of the a bright-vision film is subjected to matting treatment. , each of the I. Such as the increase in the brightness of the film of the first paragraph of the beta patent range, wherein the thickness of the sea island yarn is 0.3 to 20 denier. Among them, Hai ΛΉ ΛΉ ΛΉ 专利 专利 专利 专利 专利 专利 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大 增大40. If the patent application is patented, the refractive index of the sea portion is equal to the refractive index of the film 5 phase 4 of the substrate. 4 If applying for patent Mingtuzhe, Haizhong Island yarn is woven into weft and warp. Increase the brightness of the thin 臈 42. If you apply for the special: 1 around the 41st increase the brightness of the thin 臈, 3 of which 37 of which are 2009 2009300 weft yarn and the end of any of the sea island yarn, and weft The other of the warp yarns is an isotropic fiber. 43. A film of increased clarity as in claim 41 of the patent application, wherein the weft yarn and the end are formed by 1 to 200 strands of sea-island yarn. A backlight unit comprising a film for increasing the visibility according to any one of the above claims. A liquid crystal display device comprising the backlight unit according to the scope of the patent application. The liquid crystal display device of claim 45, wherein the liquid crystal display device comprises a phase difference film. 47. The liquid crystal display device of claim 45, wherein the liquid crystal display device comprises an absorbing polarizing film. 48. A film for increasing visibility, comprising: a substrate having a refractive index in the X-axis direction of nX1, a refractive index in the y-axis direction being nYl 'the refractive index in the z-axis direction is nZ1; ❹ a birefringent sea-island yarn, which is disposed in In the substrate, the refractive index of the x, y, and z axes of the 'birefringent sea-island yarn' is ηχ2, πΥ2' πΖ2 9 fin «Μ, at least one of the X, y, and z-axis refractive indices of the squeaky material. It is equivalent to the refractive index of the birefringent sea-island. 49. A film of increased clarity as in claim 48 of the patent application wherein nX2 &gt; nY2 = nZ2. 5. A film of increased clarity as disclosed in claim 48, wherein the substrate is uniform. 51_The film of the increased brightness of the 48th item of the patent application scope, wherein 38 200949300 Tianhai Zhongdao Yarn Island part of the refractive index of the z-axis direction (which is the length of the sea in the island, part of the length direction) is ηΧ3, Haizhong Island The island ratio of the y-axis of the island of the yarn is ηΥ3, the refractive index of the z-axis direction of the island part of the island of the sea is two folds, and the refractive index of the sea portion of the island yarn is 11X4, and the island yarn is The refractive index of the sea knives in the y-axis direction is ηΥ4, and the sea portion of the sea island yarn is fortunately. The refractive index of the direction is ηΖ4, and the target refractive index is between ηΧ3 and ηΧ4 or ηΥ3. The absolute value of the difference between η and Υ4 is 〇15 or more.拼 拼 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如XI, circle type, such as the next page 39