TW201211594A - Luminance- enhanced film - Google Patents

Abstract

Disclosed is a luminance-enhanced film capable of preventing island aggregation and solving broken filament problem even when the number of island portions of the birefringent island-in-the-sea yarn is increased remarkably.

Description

201211594 VI. OBJECTS OF THE INVENTION · TECHNICAL FIELD OF THE INVENTION The present invention relates to a brightness enhancement film, particularly to a brightness enhancement film, which can prevent an island even if the number of islands of the birefringent island yarn is significantly increased. The part agglutinates and solves the problem of broken wire. [Prior Art] A liquid crystal display (LCD), a projection display, and a Plasma Display Panel (PDP) have a strong market in the field of flat panel display TVs. We also hope that Field Emission Display (FED), Electroluminescent Display (ELD), etc. will have a place in the market with these various advantageous features along with the related technical improvements. LCD applications have extended to notebook computers, personal computer monitors, LCD TVs, vehicles, airplanes, and more. Since the second half of 1998, thanks to the rapid increase in demand, LCDs account for about 80% of the tablet market, and global sales are extremely strong. In a conventional LCD structure, a liquid crystal and an electrode substrate are disposed between a pair of optical films that absorb light. In an LCD, a liquid crystal moves by applying a voltage to an electric field generated by two electrodes, and thus has an optical state that changes with an electric field. This program displays "pixel" image storage information by polarizing in a specific direction. Accordingly, the LCD includes a front optical film and a rear optical film to induce this polarization. Since more than 50% of the light emitted by the backlight is absorbed by the rear side optical film 201211594, the LCD device does not necessarily have high use efficiency for the light emitted from the backlight. Therefore, in order to increase the efficiency of use of the backlight light in the LCD device, a brightness enhancement film may be interposed between the optical recess and the liquid crystal module. Figure la is a schematic diagram of the optical principle of a conventional luminance enhancement film. Specifically, the p-polarized light of the light guided by the optical recess to the liquid crystal component can be transferred to the liquid crystal module via the luminance enhancement film, and the s-polarized light is reflected to the optical cavity by the luminance enhancement film, and then The diffuse reflective surface of the optical cavity is reflected, wherein the direction of polarization of the light becomes random and then transferred to the luminance enhancement film again. As a result, the S-polarized light is converted into P-polarized light which can pass through the polarizing month of the liquid crystal module and then transferred to the liquid crystal module via the luminance enhancement film. The selective reflection of the S-polarized light with respect to the incident light on the luminance enhancement film and the penetration of the P-polarized light are performed by the difference in refractive index between the respective optical layers, according to the extension of the stacked optical layers And the change in the refractive index of the optical layer determines the optical thickness of each optical layer, and the flat optical layer having the anisotropic reflection coefficient and the flat optical layer having the isotropic reflection coefficient are alternately stacked in plural in the state. That is, the light incident on the luminance enhancement film is reflected by the S-polarized light and penetrated by the p-polarized light to pass through the received optical layers. Therefore, only the P-polarized light of the incident polarized light is transferred to the liquid crystal element. At the same time, the reflected S-polarized light is reflected by the diffuse reflection surface of the optical cavity, and its polarization state is randomized as described above, and then transferred to the luminance enhancement film again. Therefore, it is possible to reduce the light loss and power waste generated from a light source. 201211594 The illuminance enhancement film is manufactured by stacking a flat-shaped isotropic dry layer and a flat anisotropic optical layer, which have different refractive indices and are executed on the stack # structure. The program is such that the stacking layers of the respective optical layers have a refractive index and an optical thickness that are optimized for selective reflection and penetration of incident polarized light. Therefore, this manufacturing material is complicated. In particular, since each of the optical enhancement films has a flat shape, the p-polarized light and the s-polarized light (four) human incident polarized light have a wide range of incident angles and must be spaced apart from each other. Therefore, the number of optical layers which are excessively increased is stacked in the film, and thus the exponential increase of the cost. Moreover, this structure has the disadvantage that the wire is thus degraded in optical performance. Beibei' We have found that a brightness enhancement film containing a birefringent island-in-the-sea yarn in the matrix is extremely advantageous in solving the above problems. Specifically, when a double-folded island yarn is used, optical efficiency and luminance can be remarkably improved as compared with the use of a general birefringent fiber. The island island of Yarn Island is an anisotropic H-faced sea. In this case, • the birefringent interface between the island of the island yarn and the sea is 'in addition to the island yarn and the base f, compared to the two fibers', wherein the birefringent interface is formed only on the matrix and the birefringent fiber. At the boundary of 5, the effect of vocational education has been improved, which makes it possible to use a stacked type of brightness enhancement film for industrial use. As a result, the use of birefringent island yarns provides a better quality than the use of birefringent fibers. That is to say, the shape of the birefringent interface inside the birefringent island-in-the-sea yarn is improved by the brightness of the different optical properties of the & Therefore, for more 201211594, in order to make the optical adjustment - dry, the main skin of the weight 1 exists in the cone refraction island (four) birefringence interface (four) increase. For this purpose, the number of islands in the bismuth birefringent island yarn should be large. However, conventional island yarns include at least island portions that are concentrically arranged around the spinning core. When the number of islands is small, the structure of the section is not problematic. However, when the number of islands is long (about 3 〇 0 or more) ' due to the high density, the islands adjacent to the spinning core which are formed at the center of the island yarn during spinning can be agglomerated together. In the figure, the lb diagram shows a cross-sectional view of a conventional island 2 including a tamping island portion. In the figure, the island portion 12 is disposed in the same manner as the spinning core u in the island yarn, and the island portion occupies the entire island yarn. Section: When the number of islands is small, these sections (4) are combined (4). = 'When the number of islands is large (about one or more), due to the high density, at _ 2 and formed at the center of the island yarn The island part adjacent to the spinning core 11 can be condensed and said, 'When the number of islands in the island yarn is increased, the island's material section and the bad afforestation of the agglomeration (island agglutination) are easy to occur. Aggregation phenomenon, when the number of islands is increased ==, there is a significantly reduced birefringence interface area, such as the desired improved optical modulation efficiency. [Invention] The present invention discloses that the pointing is provided - with enough:: island even The number of islands of the birefringent island yarn is remarkable: increase the prevention of island agglutination and solve the broken wire Problem - The present disclosure also points to providing a sea-island yarn that can be used for a brightness enhancement film, 6 201211594 and capable of exhibiting the same color. In a general aspect, the present invention provides a brightness enhancement film comprising: a substrate; And a birefringent island-in-the-sea yarn in the matrix, wherein a boundary between an island portion and a sea portion of the birefringent island-in-the-sea yarn forms a birefringent interface to induce optical modulation, and the birefringent island-in-the-sea yarn comprises: a core for preventing An island agglomeration; a plurality of island groups formed radially around the core. In a particular embodiment of the invention, a boundary may be formed between the island groups such that the boundary per unit area (μιη2) The number of islands is less than the number of islands per unit area (μηι2) in the adjacent island group, and the adjacent island groups are separated by boundaries. In another specific embodiment of the present disclosure, the boundary is formed around the core In a particular embodiment of the invention, the number of islands per unit area (μηι2) of the core is greater than the unit area of the island group The number of islands (μιη2) is small. Specifically, the number of islands per unit area (μιη2) of the core is equal to or less than 1/2 of the number of islands per unit area (μιη2) in the island group. Or 1/3. More specifically, the number of islands per unit area (μιη2) at the boundary is equal to or less than 3/4 or 1/ of the number of islands per unit area (μιη2) in the island group. 2. In another particular embodiment of the present disclosure, the boundary surrounds the core and is formed in a ring shape in a plurality. In another specific embodiment disclosed in the present disclosure, the island group has a cross-sectional shape of a sector A sector, an isosceles triangle or an isosceles trapezoid. In another specific embodiment of the present disclosure, the number of island groups 201211594 is 10-50, and the number of islands included in an island group is 800-2000 In another particular embodiment of the present disclosure, the total number of islands included in the birefringent island-in-the-sea yarn is 20,000-30,000. In another particular embodiment of the present disclosure, the birefringent island-in-the-sea yarn has an A value of 500 or greater as defined by Equation 1. [Equation 1] A = - Number of islands of monofilament / Number of filaments of a composite yarn In another embodiment disclosed in the present invention, a birefringent island-in-the-sea yarn can be woven into a fabric, a weft of a fabric and a warp yarn In the case of a birefringent island-in-the-sea yarn, and the other may be a fiber, in another specific embodiment of the invention, the melting initiation temperature of the island portion of the birefringent island-in-the-sea yarn may be higher than the melting temperature of the fiber. In another particular embodiment of the present invention, the birefringent island yarn is woven into a monofilament. In another embodiment of the present disclosure, a birefringent interface can be formed at the boundary between the island portion of the birefringent island-in-the-sea yarn and the sea portion. More specifically, the island is optically birefringent and the sea is optically isotropic. In another embodiment of the present disclosure, the fibers can be optically oriented fibers. In another embodiment of the present disclosure, the fibers may be one or more fibers selected from the group consisting of polymeric fibers, natural fibers, and inorganic fibers. In another embodiment of the present disclosure, the melting initiation temperature of the island 8 201211594 of the birefringent island-in-the-sea yarn may be higher than the melting temperature of the sea portion. In another embodiment of the present disclosure, the island of birefringent island yarn The melting initiation temperature of the portion is 30 ° C or more higher than the melting temperature of the fiber. The melting initiation temperature of the island of the double-split island yarn is 30 ° C or more higher than the melting temperature of the sea. In another embodiment of the present disclosure, the fibers and/or sea portions may be partially or fully melted. In another embodiment of the present disclosure, the sea portion of the fiber and the birefringent sea island yarn may be made of the same material. In another embodiment of the present disclosure, the difference in refractive index between the substrate and the birefringent island-in-the-sea yarn in the biaxial direction may be 0.05 or less, and the refraction in the remaining axis direction between the substrate and the birefringent island-in-the-sea yarn The difference in rates is 0.1 or more. In another specific embodiment of the present disclosure, it is assumed that the refractive indices of the matrix in the X-, y-, and z-axis directions are nxl, nY1, and nzl, respectively, and the birefringent island-in-the-sea yarn is in X-, y- And the refractive indices in the Z-axis direction are Πχ2, Πγ2, and ηΖ2, respectively, and at least one of the refractive indices of the matrix in the χ-, y-, and ζ-axis directions may be the same as the refractive index of the birefringent island-in-the-sea yarn. In another embodiment of the present disclosure, the difference in refractive index between the sea portion of the birefringent island-in-the-sea yarn and the island portion in the biaxial direction is 0.05 or less, and the sea portion of the birefringent island yarn and the island portion are The difference in refractive index in one axial direction is 0.1 or more. In another specific embodiment of the present disclosure, it is assumed that the islands of the birefringent island-in-the-sea yarn have refractive indices in the χ-(longitudinal), y-, and ζ-axis directions of 201211594 Ι1χ3, Πγ3, and Πζ3′, respectively. The refractive indices of the sea in the X-, y_ and Z-axis directions are nX4, ny4 and nZ4, respectively, and at least one of the refractive indices of the matrix in the X-, y- and z-axis directions can be combined with the birefringent island yarn The refractive index is the same. In another particular embodiment of the present disclosure, the absolute value of the difference between the refractive indices nX3 and nX4 may be 0.1 or more. In another embodiment of the present disclosure, the birefringent island-in-the-sea yarn has a diameter of from 1 〇 to 1 μm. In another general aspect, the present invention provides a sea-island yarn for enhancing brightness, comprising: a core for preventing island agglutination in the island-in-the-sea yarn: and a plurality of island groups, the surrounding core being formed into radiation shape. In another specific embodiment of the present disclosure, a boundary system is formed between the group of islands such that the number of islands per unit area (μιη2) at the boundary is smaller than the unit area per unit area (μιη2) of the adjacent island group. The number of islands, and the adjacent island group is separated by boundaries. In another particular embodiment of the present disclosure, the boundary is formed as a light shot around the core. In another specific embodiment of the present invention, the number of islands per unit area (μιη2) of the core is smaller than the number of islands per unit area (μιη2) in the island group. In another particular embodiment of the present disclosure, the boundary surrounds the core and is formed in a ring shape in a plurality. In another particular embodiment of the present disclosure, the island group has a cross-sectional shape of a sector gear, an isosceles triangle or an isosceles trapezoid. In another specific embodiment of the present disclosure, the number of island groups 201211594 is 10-50, and the number of islands included in an island group is 800-2000. In another particular embodiment of the present disclosure, the total number of islands included in the birefringent island yarn is from 20,000 to 30,000. The terms used herein will be given a brief description. The phrase "fibrous birefringent" means that when light is irradiated to fibers having different refractive indices in different directions, the light rays incident on the fibers are refracted in two different directions. The term "isotropic" refers to an optical property of an article that has the same refractive index in all directions as it passes through the article. The term "anisotropy" refers to the optical properties of an article depending on the direction. An anisotropic article has a double-fold, the opposite of the anisotropy. The term "optical modulation" means a procedure in which the irradiated light is reflected, refracted or scattered, or its intensity, wave. The loop or feature is changed. The term "core" refers to a central portion from which the group of islands and the boundary are formed into a radial shape having a predetermined area to prevent agglomeration in the island portion of the profile of the sea island yarn. The "refining start temperature" means the temperature at which the polymer begins to melt, and the term "melting temperature" means the temperature at which the melting occurs the fastest. Therefore, when the melting temperature of the polymer is observed by Differential Scanning Calorimetry (DSC), the temperature at which the melting endothermic peak starts is the melting onset temperature, and the temperature corresponding to the tip end of the endothermic peak is the melting temperature. The term "photochromic fiber" refers to a color-inducing agent which, by virtue of the conformation/optical design of the knot of the fiber of the interference light, makes the fiber appear color without physical/chemical bonding to, for example, a dye or a pigment. According to the present invention, the luminance enhancement film containing the birefringent island-in-the-sea yarn does not cause island aggregation in the central portion of the island-in-the-sea yarn even if the number of island portions is 20_ or more. Since the island portion of 20,000 or more can be formed in the island yarn, the area of the optical modulation interface is maximized, and the optical modulation effect is remarkably improved. Therefore, compared to the use of known birefringent fibers or island-in-the-sea yarns having about 500 islands, the brightness enhancement film comprising the two-shot island of the present invention has a very superior optical modulation effect. The area of the interface is significantly increased, so that the brightness can be significantly improved. When the birefringent island-in-the-sea yarn is woven into a fiber form, and is contained in the hui=film, since it has a large number of island portions, even if it is a (birefringent sea) early yarn, the desired luminance can be obtained, and therefore, And it is necessary to improve the number of birefringence island yarns used to improve the brightness of the yarn, so that yarn breakage and broken yarn can be avoided. ‘,' In addition, the precision of the majority of the islands used for the brightness of the yarn can be reduced. Since it is possible to manufacture ultra-fibrous fibers in an island=transmission, it is not only advantageous for manufacturing ultrafine fibers, but also can be significantly reduced in manufacturing cost. - The other features and aspects of the invention are apparent from the following detailed description, drawings and claims. (4) and A. [Embodiment] 12 201211594 t:: The following specific embodiments of the drawings are referred to, and the features, points, features and aspects will be apparent. The invention is disclosed, and can be embodied in various forms and should be limited by the specific embodiments. Of course, these specific implementations _== this = complete and complete, and will be fully communicated to the familiarity of the invention. The terminology used herein is for the purpose of description only. As used herein, "the" and "the" are also intended to include the plural unless otherwise clearly indicated below. The term "at least, includes" when used in this document indicates the presence of such features, integers, operations, components and/or components, but does not exclude the presence or addition of various other features, integers, steps, Operations, components, components and/or groups: and 〇 '

Exemplary embodiments are described in detail below with reference to the accompanying drawings. As described above, the yarn prepared by the spinning nozzle known to manufacture sea-island yarns includes at least a island which is concentrically arranged around a spinning core: the island portion is randomly arranged in a non-woven core manner. When the number of islands is small, Shao, or the structure of the section is no problem. However, when the number of islands is large (about Deng 0 = more species), then during spinning, due to the high density, adjacent to the island formed in the island = the center of the spinning core, agglutination together (island agglutination) ). When the number of islands in the island of s I increased, at the island yarn center, Qiu Ba, said Tian Tianji (fig. lb). The 77th will be condensed in Korean Patent Application No. 2009-7642, as in its 31st household _ the present inventors have used the distribution plate above the spinning nozzle to prepare a brightness enhancement ^ No, and its 13 201211594 is contained in a monofilament 1016 islands of birefringent island yarn. Fig. 2a shows a birefringent island-in-the-sea yarn having 1016 islands. It is known that although the number of islands exceeds 500, the agglomeration of the island does not occur in the central portion of the birefringent island-in-the-sea yarn. However, since the birefringent island-in-the-sea yarn (monofilament) having 1 〇 16 islands shown in Fig. 5 is only a monofilament (diameter = 丨 9 μm) and has low optical modulation efficiency, it is prepared as 40. A composite yarn of denier/12 monofilament (strand), 80/24 (danny/monofilament), and the composite yarn is woven into a weft or warp fabric, and is used for a brightness enhancement film. Specifically, the ninth and second graphs show the fabric 6 of the birefringent island-in-the-sea yarn (monofilament) of Fig. 2a. The fabric is prepared by using a conjugated-strand (monofilament) birefringent island-in-the-sea yarn 61 as a weft (Danny/single-dimerity fiber 62 as a weft yarn. 2. Results 'Although the optical modulation efficiency is improved, 5 is the diameter of the 彳, the diameter of the monofilament and the Α 因而 因而 = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = , the birefringent island yarn disclosed by the number still exists in the island of the condensed moon collection 2009-7642. To solve this problem, the present invention provides a possibility of stimulating. - a matrix; and a birefringent sea located inside the matrix : The island yarn contains a core to prevent the island from agglutinating; wherein the birefringence is formed around the core to form a radial shape. As a result, 'the drum island group, the number of parts exceeds 2_0, and the island agglutination does not cause the double island. The yarn is made in the yarn without the birefringence island yarn composite. Therefore, when the fabric is increased by the birefringence interface, the high brightness can be maintained. The entanglement of the monofilament in the strong film in the island yarn and the yarn breakage can be included. In the case of the increase in brightness, it does not occur in 201211594 broken monofilament. The defect of the luminance enhancement film can be avoided, and the uniform luminance can be maintained without reverse polarization. Referring to Fig. 3, the birefringent island-in-the-sea yarn included in the luminance enhancement film disclosed in the present invention will be described in detail, and the third The present invention is an electron microscope image (X1000) of a sea-island yarn profile included in a brightness enhancement film according to a specific embodiment of the present invention. The birefringent island-of-the-sea yarn comprises at least a core 510' for preventing island agglutination; And a plurality of island groups 52〇, which are formed in a radial shape around the core 510. First, the core HO formed in the birefringent island-in-the-sea yarn is described. The core 51 is formed in the birefringent island yarn to prevent island agglutination. Specifically, it is formed in the central portion of the birefringent island yarn and is surrounded by the island group 52〇 and other end portions. In general, if the number of islands of the birefringent island yarn increases, due to the island Focusing on the central portion of the island yarn, island agglomeration is apt to occur in the center portion. Therefore, in the disclosure of the present invention, the core 510 system capable of avoiding island agglutination is formed in the birefringent island yarn. In order to prevent island agglutination, even if the number of islands increases significantly: In particular, when the number of islands per area (μιη2) in the core 51〇 is smaller than the area per unit area (μηι2) in the island group The number of islands 'prevents island agglutination is extremely beneficial. Specifically, in Figure 3, when comparing C shows the core part' and shows the inside of the island group, we can observe the number of islands per unit area, in c is much smaller than eight. When the birefringent island yarn is spun from the spinning nozzle, the island is brewed and expanded due to the swelling of the town (9)e (IHng). The island even secretly expands to the area where only the sea is present. Therefore, in the early stage of spinning, when the void (or only the sea portion) is formed in the central portion of the island yarn, at the end of the spinning, the 15 201211594 = expansion: expansion to the central portion of the island yarn. However, since it is in the island of the island, the agglomeration of the island of the island in the central part of the island yarn can be avoided. That is, in the early stage of spinning, although there is no void in the core, such as the central portion of the island yarn, the island is swollen and expanded to the core due to swelling of the town. However, since the island is initially almost broken in the core of the island yarn, when the swelling occurs in the town, the number of islands in the core area of the core t is smaller than that in the island group (〆). Number of islands. Specifically, the number of islands per unit area in the core (the number of islands per μη〇 is smaller than or equal to 1/2' per unit area (〆) in the island group is preferably 1/3. The mosquitoes may be compared with the number of islands in the core group 510 and the island group 520, 530. Specifically, the unit area may be Ιμηι2, but is not limited thereto. One of the specific embodiments disclosed in the present invention, The core 510 has a straight cymbal which is sufficient to prevent the island from agglutinating and corresponding to the area. The diameter and the area may vary depending on the diameter of the birefringent island-in-the-sea yarn and the number of islands. Specifically, when the core 51〇 It has a circular shape and may have a diameter of 〇2_5μιη. When the core 510 has an egg shape, the major axis may be 0.5-ΙΟμιη, and when the core 510 has a polygonal shape, the distance from a vertex to the farthest vertex may be 0.5-10 μm. The core 510 is formed so as to be smaller than the island portion of the island group, thereby preventing the island from being aggregated. Next, the island group 520, 530 and the island group 520, 530 are described in detail. Boundary 54〇' as used here, island It refers to the microfibrils contained in the birefringent island yarn. Some islands from the island group and the island group exist in plural. In particular, the island group 520, 530 is surrounded by a plurality of cores 510 of 201211594. Formed as a radial ' and a plurality of island groups 520, 530 are separated by a boundary 540 formed between adjacent island groups 520, 530. In particular, the boundary 540 is formed radially around the core 510. And the number of boundaries 540 is at least less than the number of island groups. Specifically, the number of islands per unit area (μ^2) formed at the boundary between adjacent island groups 520, 530 is smaller than that in the island. The number of islands per unit area (μπι2) in the group to prevent agglutination of the island. Specifically, in Fig. 3, when comparing the area showing the boundary 54〇, and showing the inside of the island group 520, we can The number of islands per unit area (μηι2) was observed, which is smaller than that of A. When the birefringent island yarn is spun from the spinning nozzle, the island is swollen due to the expansion of the magnesium mouth. The island is even swollen. To the area where only the sea is present, so in the early days of spinning The combination can be formed as the center material of the sea yarn, and it is swollen to the boundary in the island. Since there is no island at the boundary of the island yarn, it is avoided at the border of the island yarn. That is, because the island is the most non-existent at the boundary of the island yarn, even when the swelling of the town mouth occurs, the number of islands per unit area (μπι2) at the boundary is much smaller than that per unit area (μπι2) in the group. The number of islands. Specifically, the number of islands per unit area (〆) at the boundary may be equal to or less than 3/4, preferably 1 per island area (4) in the island group. /2. The decision on the area of the military is based on the border 54 and the island group 52〇, 5. Specifically, the unit area may be set to 1 μm 2 , but not in the specific embodiment disclosed in the present invention, the side core is formed into a radial shape, another garment shape, and one or more annular boundaries 17 201211594 _ = formed into concentric circles. The annular boundary can be continuous or discontinuous. The shape of the heart 5^ shape= is not particularly limited, as long as it can surround the core as a sector tooth & ^ ^ can have the shape of a cross section, a wheel, a waist triangle or an isosceles trapezoid. Another specific embodiment disclosed by fotf is 'the number of the plurality of island groups -' and the number of islands included in an island group is __2_. In the other case, the total number of the examples included in the birefringent island, / / Nakajima neighborhood is 2〇〇〇〇·3〇〇〇〇. In particular, one of the specific embodiments of the invention discloses that the electric island-like birefringent island-in-the-sea yarn of the island-in-the-sea yarn has two. The island group, each island / has 1,250 islands, and is included in the birefringence sea 25000. Because., 钿站丄八η...•The number of horse mouth 为 is 1〇_ $, according to the present disclosure, the birefringent sea bream yarn is preferably s or more, more preferably 20,000 or more, used for brightness Oh, the island can maximize the brightness improvement and prevent the wire from breaking. The diameter of the birefringent island-in-the-sea yarn disclosed herein is preferably 1 40 40. 1 〇〇 μπι, but is not limited thereto. Ιιη,更=说' As shown in the 2& figure, even if the number of islands exceeds that of Nassen: a birefringent island yarn with 1016 islands, in the case of 'the right island number 10_ or more, the island Condensed. Furthermore, as shown in Fig. 2 and Fig. 2d, when birefringence = hair is made into 80/24 (Danny/monofilament), and the composite yarn is woven into an island yarn, the weft yarn is produced, and the crack is generated. And the silk is, it will be warp or reversed. Thus, the enthalpy value defined by Equation 1 in the other embodiments of the present invention - the split wire and the island yarn is 500 or more. ^Birefringence In this case, 18 201211594 ^In the m-luminance enhancement of the single (four) and the yarn breakage will not be detected to avoid breaking the wire. As a result, the brightness of the film is weak and the brightness can be maintained evenly. s , , day can be avoided, [Equation 1] 数目 The number of islands of I monofilament / the number of monofilaments of composite filaments will be the same as the conventional 5 〇 double compound of 300 islands, ' Or a conventional 12-strand birefringence with 1G16 islands, or a composite. In this case, the A values are only 6 and 500 respectively. In contrast, the Mi Gu θ 丄 retreats a small Liang Le has 25,000 island 〇 strands) or 15 _ i W birefringent island yarn, the depreciation each become 25000 and the transport is greater than 500. Compared to the case when several strands are compounded, since the use of monofilaments significantly reduces the risk of fiber entanglement and rupture of monofilaments due to yarn breakage, we prefer to use birefringent island-in-the-sea yarns with an A value of 1000 or Above, 5〇0〇 or more, 10000 or more, or 20,000 or more. Preferably, a monofilament of birefringent island-in-the-sea yarn having 10,000 to 20,000 or more islands, or a composite yarn of about 2 strands, can be used to effectively avoid fiber entanglement and breakage of the monofilament. Fig. 5 is a view showing a specific embodiment of the axe according to the present invention, using a monofilament yarn having a sea-island yarn (having a 25-inch island portion) as a warp yarn. As shown in Fig. 5, yarn breakage does not occur in the birefringent island yarn. If the monofilaments with different numbers of islands are combined (for example, if 10 monofilaments with 300 islands and 10 monofilaments with 5 islands are compounded), the average number can be defined as a single Number of Silk Island Departments. In another embodiment of the present invention, the melting initiation temperature of the island portion of the birefringent island-in-the-sea yarn is higher than the melting temperature of the fiber and/or the sea portion. When 19 201211594 birefringent island yarns are merged as they are - a luminance enhancement film, the birefringence island can be easily moved (e.g., entangled) during, for example, lamination. Therefore, after the fabric including at least the birefringent island-in-the-sea yarn is woven, the fabric can be laminated between the substrates to repair the birefringent island-in-the-sea yarn. (4) If the birefringent island-in-the-sea yarn is incorporated into the brightness enhancement film into a fabric form, instead of being used as it is for the liquid crystal display, even if the fibers constituting the fabric are made of a transparent material, the fabric (fiber) is visible from the outside. Therefore, there is a limit to commercialization: Therefore, in order to solve such problems, the present invention provides a luminance enhancement film wherein the temperature of the birefringence island island is higher than the fiber melting temperature. I first - Fig. 5' details the weave included in the luminance enhancement film. Figure 5 is not shown to be useful in the fabrics disclosed herein. The fabric contains warp yarns and turns. Through the material, the spring is a yarn, and the shirt is a fiber. In other words, when a birefringent island-in-the-sea yarn is used as the weft yarn, the fiber is used as a warp yarn. And when the birefringent island-in-the-sea yarn is used as a warp yarn, the dimension is used as a turn. The fabric constituting the warp and warp yarns can be made of material to allow light to pass through. In the disclosed embodiment - the specific embodiment, the melting initiation temperature of the island portion of the birefringent island-in-the-sea yarn is higher than the melting temperature of the fiber. Therefore, when 敎 and / == are applied to the matrix stack, and the temperature is at the tempering temperature of the fiber and the island (4) melting initiation temperature (four), the island is still insoluble due to the lack of threat (4), but the fiber has been Part or all melted. Therefore, the fiber as the weft or warp yarn is formed in the lamination period (4) and becomes a part of the substrate. 201211594 minutes, only the birefringent island-in-the-sea yarn inside the obtained brightness enhancement film remains. The fiber I visibility problem can be significantly improved. Furthermore, due to melting of the fibers. But you can be an adhesive. The fabric can be adhered to the substrate without using an extra. Therefore, the Birefringence Island (4) Part A can have a melting fox having a hybrid starting temperature higher than ^. Specifically, the island portion of the birefringent island-in-the-sea yarn may have a temperature higher than or equal to or higher than the fiber melting temperature, more preferably, or from the beginning, and the melting initiation temperature of the island of the birefringent island may be high. The sea melting temperature is better for the island temperature of the island of birefringence island yarn; the temperature of the sea is higher than that of the sea. As a result, the birefringence sea can be partially or fully hybridized. In the specific embodiment disclosed in the present invention, the melting initiation temperature of the island portion of the refraction island yarn may be 13 (M3 〇 () c, and the refining temperature of the same fiber may be i (9) - 嫣., the sea portion of the birefringent island yarn The temperature can be 100-400 ° C, and the lamination temperature can be 42 〇. Unrestricted b The conclusion is that the melting temperature of the isotropic fiber used as the weft or warp of the fabric is lower than that used for Qing or The birefringence island yarn singulation starting temperature of the weft yarn is performed at a temperature between the melting temperature of the isotropic fiber initializing temperature and the island yarn, and the brightness enhancement film containing the fabric can solve the fiber visibility problem. This is because of the isotropic fiber or all the veins. Moreover, since the sea surface secret temperature of the birefringent island yarn is lower than the melting initiation temperature of the island, if the lamination is carried out at a temperature between the two , the sea part is either fully hybridized, and the layer is provided without the use of an additional adhesive. The matrix is described, and the matrix can be made of a thermoplastic or thermosetting polymer 21 201211594 'The required range of wavelength of the transferable light can be To allow light to be easily worn Transparent or translucent material. Specifically, the substrate may be amorphous or semi-crystalline, and may be a homopolymer, a copolymer or a mixture thereof. Specific examples include polycarbonate (pc); Polystyrene (PS); alkyl stupid ethylene; alkyl, aromatic or alicyclic (fluorenyl) acrylates, such as polyacrylic acid vinegar (PMMA) and PMMA copolymer; (fluorenyl) acrylic acid Ethyl ethoxide and propoxide; polyfunctional (fluorenyl) acrylate; acrylated epoxy resin; epoxy resin; other ethylenically unsaturated compound; cyclic olefin and cyclic olefin copolymer; acrylonitrile-butadiene-styrene (ABS); styrene acrylonitrile (SAN) copolymer; polyvinyl cyclohexane; PMMA/polyvinyl fluoride blend; polyphenylene ether alloy; styrene block copolymer; polyimine; Polyvinyl chloride; polydimethyl methoxy oxane (PDMS); polyamino phthalate; unsaturated polyester; polyethylene; polypropylene (PP); polyalkyl phthalate, such as polyethylene terephthalate Ester (PET); polyalkyl naphthalate's such as polyethylene naphthalate (PEN); polyamine; ionic polymer; Ester/polyethylene copolymer; cellulose acetate; cellulose acetate butyrate; fluoropolymer; polystyrene polyethylene copolymer; PET and PEN copolymers, such as polyolefin PET and PEN; and polycarbonate/fat Group PET blends. More specifically, polyethylene naphthalate (PEN), ethylene naphthalate copolymer (C0_peN), polyethylene terephthalate (PET), polycarbonate ( PC), polycarbonate (PC) alloy, polystyrene (PS), heat resistant polystyrene (PS), polydecyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile-butadiene-styrene (ABS), polyamino phthalate (PU), polyimine (PI), polyethylene (PVC), styrene Acrylonitrile (SAN) Blend, Ethylene Vinyl Acetate 22 201211594 (EVA), Polydecylamine (PA), Polycondensation (P0M), Polymerization, Epoxy Resin (IV), Urea (UF), Melamine (_ ), unsaturated poly(up), shixi (9), elastomer and cyclomethine polymer (C〇P, Japan Z Co., Ltd. and Nippon Dish Co., Ltd.)' These can be used alone or in their Used in combination. More specifically, the substrate may be constructed of the same (four) material as the sea portion of the birefringent island-in-the-sea yarn. Furthermore, the substrate may also contain an additive as long as the additive does not cause deterioration of physical properties; such additives include, for example, an antioxidant, a light stabilizer, a lubricant, a dispersant, a uv absorber, and a white color. Pigments, and fluorescent brighteners. The matrix can be optically isotropic. In consideration of different physical properties, the constituents of the matrix or its optical properties may be selected to be the same as those of the sea and/or fiber. In this case, the matrix may be partially or completely melted during the lamination process, so that the adhesion between the birefringent island-in-the-sea yarn and the substrate can be improved about without using an additional adhesive. The matrix can comprise two layers. Specifically, the three layers may be formed to have a structure of a stack 4 including a surface layer, a core layer (layer A), and a surface layer (layer B) via coextrusion of a polymer. The skin layer corresponding to the fabric may have the same melting temperature as the sea portion and/or the fiber to adhere to the birefringent island yarn. The core layer may be made of a material having a higher melting temperature than the sea and/or fibers to prevent deformation of the substrate due to heat generated by the luminaire. Therefore, when the above-mentioned fabric is laminated between the three-layer sheets, the surface layer (A 1) / core layer (B1) / surface layer (A2) / fabric / surface layer (A3) / core layer (B2) / surface layer (A4) can be obtained. )Structure. When the surface layer has the same melting temperature as the sea and/or the fiber, the surface layer and the sea portion can be melted together so that the surface layer (A2, Λ 3) and the fabric layer become a layer. 23 201211594 Next 'Description can be used as fabric fiber, as long as it can be with, or! Yarn of yarn. Any temperature-related regulations may be given, y, woven to form a fabric and conform to the above. Specifically, when Kao Xiong, and for the fiber type, there is no limited weaving, the fiber can be optically perpendicular to the island of the island yarn. The way it is raw is modulated by the birefringent island yarn: Also a double-fold fiber. The fibers may be polymers, the antenna may not pass through the dimension, or a combination thereof. Moreover, the machine fiber (for example, the same material of the glass fiber portion. Further, f:, the fiber may be the sea bream with the birefringent island yarn), in the present invention, the η ii can be folded with the matrix: the rate yarn. The birefringence islands in the double-refraction island yarn, so that the optical modulation can change the effect of the county; the island money sea can have different optical flatness. More lies, the sex and the sea can be the same direction The ruler / body and & the island can be in the island yarn of the opposite direction, along the = to 1 including the optically isotropic sea and the anisotropic island degree or not "Meet 2: t::: refraction : In essence, the equal process proportionally increases the scattering efficiency of the factory with the square of the difference in refractive index. ί The polarization of the light along the axis will be smaller. (4) Scattering. When the refraction of a particular pumping part is equal to the refractive index of the island, regardless of the size and shape of the island's yarn, the incident light parallel to the axis may be crossed by the electric field, and may not pass the island. Scattering. More specifically, Figure 4 illustrates a cross-sectional view of the light passing through 24 201211594 birefringent island yarn. In this case, the P-wave (represented by the solid line) passes through the island-in-the-sea yarn without being affected by the interface between the outer and birefringent island-in-the-sea yarns and the interface between the island and the sea of the birefringent island yarn, and the 8 wave (with a dotted line) Representation) The interface between the substrate and the birefringent island yarn and/or the interface between the island and the sea of the birefringent island yarn is optically modulated. The above optical modulation phenomenon mainly occurs in the matrix and birefringent island yarn. The interface between the island and the sea between the birefringent island yarn and the sea. Specifically, when the matrix is optically isotropic, like ordinary birefringent fibers, optical modulation occurs in the matrix and birefringent island yarn. The interface between the two, more specifically, the difference in refractive index between the matrix and the island yarn may be 0.05 or less, and the difference in refractive index in the remaining one axis may be 〇 or more. S, assuming that the refractive indices of the matrix in the x_ and M ζ-axis directions are nxl, nY1, and ηζ, respectively, and the refractive indices of the birefringent island-in-the-sea yarns in the x_, y-, and ζ-axis directions are respectively ηΧ2, shame 2, and 2 , the matrix is in the direction of χ_, ^ and ζ_axis At least the rate of incidence may be the same as that of the birefringent island-in-the-sea yarn yarn, JnX2>nY2=nz2. Further, at the same time, in the birefringent island-in-the-sea yarn, the island portion and the sea portion may have different optical properties. Forming a birefringent interface. Specifically, when the island portion is anisotropic and the sea portion is isotropic, a birefringent interface can be formed at the boundary between the island portion and the sea portion. More specifically, the refractive index in the biaxial direction The difference may be 〇〇5 or less, and the difference in refractive index in the remaining -axis directions may be 〇1 or more. In this case, the P-wave passes through the birefringent interface of the island-in-the-sea yarn, and the s_wave is optically modulated. For a more detailed explanation, it is assumed that the refractive indices of the islands of the birefringent island yarn in the Χ-(longitudinal), y-, and Z_ axes are respectively n illusion, Μ, 25 201211594 and the sea is at χ·, y- And the refractive indices in the Z-axis direction are ηχ4, ηγ4, and ηΖ4', respectively, and at least one of the refractive indices of the matrix in the X-, y-, and Ζ-axis directions may be the same as those of the birefringent island-in-the-sea yarn. The absolute value of the difference between the refractive index nx3 and nx4 may be 〇. 1 or more. More specifically, the optical modulation efficiency can be maximized when the difference in refractive index between the sea portion and the island portion in the longitudinal direction of the island yarn is 0.1 or more and the refractive indices of the sea portion and the island portion are substantially equal in the remaining two axes. At the same time, when the matrix has the same refractive index as the sea portion of the birefringent island-in-the-sea yarn, the optical modulation efficiency can be easily improved. Therefore, in order to improve the optical modulation efficiency, a birefringent island-in-the-sea yarn having a large difference in refractive index between the island portion and the sea portion in the longitudinal direction and having substantially the same refractive index in the other two axes can be selected. The sea and/or island of the birefringent island yarn may be composed of polyethylene naphthalate (PEN), copolyethylene naphthalate (co-PEN), polyethylene terephthalate (ΙΈΤ), poly Carbonate (pc), polycarbonate (PC) alloy, polystyrene (PS), heat resistant polystyrene (PS), polydecyl methacrylate (PMMA), polybutylene terephthalate (PBT) , Polypropylene (PP), Polyethylene (PE), Acrylonitrile Butadiene Styrene (ABS), Polyurethane (PU), Polyimine (PI), Polyvinyl Chloride (PVC) ), styrene acrylonitrile (SAN) blend, ethylene vinyl acetate (EVA), polydecylamine (PA), polyacetal (POM), polyphenol, epoxy resin (EP), urea (UF) Made of melamine (MF), unsaturated polyester (UP), bismuth (SI), elastomer and cyclic olefin polymers, and combinations thereof. Specifically, in view of an effective increase in optical modulation, a material having an island portion and a sea portion having substantially the same refractive index on both axes but having a large difference in refractive index on one axis can be selected. However, more specifically, when polyethylene naphthalate (PEN) is used as the material of the island of the island of the birefringent sea 26 201211594, and the copolymer of ethylene naphthalate or polycarbonate is used. When it is used as a material for the sea, it can greatly enhance the brightness compared to the birefringent island yarn made of common materials. Particularly when a bismuth alloy is used as the sea portion, a birefringent island-in-the-sea yarn having the most excellent optical modulation properties can be prepared. In this case, the polycarbonate alloy preferably includes at least a polynuclear&L ester and a modified polyparaxylcyclohexyl dimethylene glycol (PCTG). More specifically, at least a polycarbonate and a modified poly-p-cyclohexylene dimethyl dimethyl diol (pcTG) are used and the weight ratio of the two is 15.85 to 85:15. A polycarbonate alloy which can effectively enhance the glow, and when the amount of the field carbonate is less than 15%, the spinning effect is excessively increased: the viscosity of the polymer is determined, and the disadvantage of the spinning machine cannot be used. When the amount of the field of the carbon (4) exceeds 85%, the glass transfer/magnification increases and the spinning tension increases after the nozzle is ejected, so it becomes difficult to ensure the spinning performance. And a modified poly(p-citric acid) cyclohexylmonomethylene glycol diol (PCTG) and a weight ratio of 4: ό to 聚碳酸酯. 4 of the polycarbonate alloy, which can effectively enhance the brightness. Further, in view of the efficiency improvement of the optical modulation efficiency, it is preferable that the sea portion of the island material has a large difference in the longitudinal refractive index and a substantially the same refractive index in the other two axes. Methods for upgrading isotropic materials to birefringent materials are well known in the art. For example, polymer molecules can be oriented so that when stretched at the appropriate temperature conditions, they will become birefringent. The birefringent island-in-the-sea yarn disclosed in the present invention can be produced, for example, by co-extrusion, but is not limited thereto. Therefore, it is known that the island yarn only uses the 27 201211594 island portion left after melting the sea portion as the fine fiber, and the island-in-the-sea yarn contains at least the heart-shaped shot, but the present invention discloses that the sea portion having the substitute dazzling island yarn has the raw material. The sea and the islands are directional, while the seas are the same as the sympathy. However, the opposite case is also optional. The island and the optical modulation efficiency of the birefringent island-in-the-sea yarn are maximized. The surface has a different optical property and is used for optical modulation. To this end, the number of islands should be increased. Specifically, light 1 22 is greater than 500. However, in the known island-in-the-sea yarn, even if the island portion is a child, 0 and the sea portion is optically isotropic, when the number of island portions exceeds 50 C', the island portion tends to aggregate. As a result, the optical modulation interface area is reduced and the photon modulation efficiency is lowered. In contrast, the birefringent island-in-the-sea yarn disclosed in the present invention is capable of preventing agglomeration of islands. As a result, the optical modulation efficiency of the island yarn is maximized, and according to the present invention, when the birefringent island-in-the-sea yarn is used as the luminance enhancement lining, the luminance of the optical modulation efficiency and the luminance increase is as follows, and can be made extremely large. Improvement. In one embodiment of the present disclosure, the brightness enhancement film disclosed herein may have a structured surface layer. More specifically, the structured surface layer can be formed on the side of the emitted light. The structured surface layer can be in the form of a 稜鏡, lenticular lens or a convex lens. More specifically, a curved surface in the form of a convex lens may be provided on the side of the light emitted from the luminance enhancement film. The surface can be spotted or defocused through the light from the surface. Further, the surface of the emitted light may have a prismatic pattern. Next, the method of manufacturing the birefringent island-in-the-sea yarn disclosed in the present invention 28 201211594 will be explained. These birefringent island-in-the-sea yarns can be produced by any method generally used for the production of island-in-the-sea yarns, and are not particularly limited. Any spinner or spinning nozzle can be used without limiting its shape as long as it can produce a birefringent island-in-the-sea yarn. In general, the spun or spinning nozzle used may have substantially the same shape as the island configuration pattern seen from the birefringent sea island yarn profile. Specifically, any spinning nozzle can be used as long as it can prepare an island-in-the-sea yarn by combining an island portion extruded from a hollow pin or a spinning nozzle with a sea portion supplied from a passage. Wherein the hollow plug or the spinning nozzle is partitioned by the "field", and the channel is partially partitioned, and the channel is designed to fill the space therebetween; and extruded through a discharge port which gradually narrows the combined flow The set of mouth machines forms an island yarn having two or more spinning cores. A specific example of a suitable spinning nozzle is shown in Fig. 6, but the spinning nozzle which can be used in the present invention is not limited thereto. Figure 6 is a cross-sectional view showing an upper distribution plate for preparing a spun yarn of a island-in-the-sea yarn in accordance with a specific embodiment of the present invention. The upper distribution plate comprises at least: a core 121 which forms a heart and prevents agglutination, and a plurality of island supply units 123, 124 which are around the core 121 and are provided with a plurality of island supply channels 122. In the meantime, several seas are formed. (5 The supply unit 125 is formed along the outer circumference of the island supply units in, 124, and has a plurality of sea supply passages in its towel. Korean Patent Application No. 1〇-2〇1〇_0〇27670 is incorporated herein. For reference, the spinning nozzle for the birefringent island-in-the-sea yarn of the present invention includes the above-mentioned upper distribution plate which may be different from the characteristics of the island-in-the-sea yarn according to the desired shape. The upper distribution plate is arranged in the upper part. Thereafter, the spinneret having the funnel shape 1 can be arranged in the lower portion as the discharge port of the island yarn. Meanwhile, as shown in the figure 29 201211594, the lower spinner plate 130 includes the flow passages 52, 53' to supply the unit from the island. The polymer material supplied by the jellyfish supply unit can flow to a row of outlets 131. Depending on the structure of the nozzle, the number and shape of the flow passages 132, 133 can be differently designed. The discharge port 131 can be arranged in accordance with the flow path. Furthermore, an additional distribution plate may be disposed above and/or below the upper distribution plate to promote the distribution and mixing of the island portion and the sea portion. Next, a method for preparing the brightness enhancement film disclosed in the present invention will be described. Above, in use After the island yarn is refracted so that the fabric is woven, the fabric can be disposed between the substrates and thereafter laminated. Specifically, the substrate has a two-layer structure of a surface layer/core layer/surface layer. When laminated, a surface layer can be formed (A丨) / core layer (B) / surface layer (A2) / fabric layer (〇 / surface layer (A3) / core layer (B2) / surface layer (A4) a total of seven layers. As mentioned above, if adjacent to the fabric layer A2, A3 Having the same melting temperature as the sea portion of the birefringent island-in-the-sea yarn and the fiber, these may be partially or completely melted. The lamination may be carried out by, for example, a winding or hot pressing procedure. In this case, in order to prevent foaming, vacuum may be applied. The hot pressing is performed in the state, so that the adhesion force and the luminance can be improved. Specifically, the degree of vacuum during hot pressing can be 5 to 500 Torr, and the applied pressure can be i.〇_i〇〇kgf/cm2, and the processing time It can be 1-30 minutes. As detailed above, the lamination temperature can be selected between the melting initiation temperature of the island of the birefringent island yarn and the melting temperature of the fiber and/or sea portion. When the degree of vacuum is less than 5牦The process efficiency is not satisfactory. When it is more than 500 Torr, the defoaming is not sufficient. When the applied pressure is lower than lokgfycm2, the adhesion of the film is not sufficient, and when the pressure exceeds l〇〇kgf/cm2, the fiber arrangement is interrupted due to excessive pressure. When the treatment time is less than i minutes, defoaming and then insufficient And when the processing time exceeds 30 minutes, 201211594 'the process efficiency is not satisfactory. · The brightness enhancement film disclosed in the invention can be widely used in flat panel displays, including LCD, LED TV, projection display, plasma display, field The present invention is described by way of example only, and is not intended to limit the scope of the invention. <Example 1> As a sea portion (11^1.57, 1¥=1.57, 112=1.57, melting temperature=145〇〇:), an isotropic polycarbonate (PC) alloy including pc and modified PCTG, the ratio is 5:5, and the island system uses an anisotropy ρΕΝ (ηχ=188, %=1.57, ηζ=1.57, melting initiation temperature=262〇c). In order to obtain a birefringent island-in-the-sea yarn having a cross-section as shown in Fig. 3, the materials are supplied to a --spinning nozzle which has a distribution plate on top of 12 island supply units as shown in Fig. 6, and has Figure 7 shows the lower (four) plate with a row of outlets. A birefringent island-in-the-sea yarn having a cross section as shown in Fig. 3 (monofilament, number of islands = 25040, diameter = 66 5 μmη) was prepared. After preparing a partially oriented yarn (ρ〇γ, 85 denier/1 monofilament at a spinning rate of 2500 '), the crucible was stretched at 140 ° C to prepare fy (4 〇 Danny eight using the birefringent island yarn thus prepared) (monofilament, 4 inch Danny eight monofilament as warp yarn, and the same isotropic sea 之 alloy fiber _ temperature =, drive G Danny / 24 monofilament) as a special woven fabric. 201211594 ceremony; 5 map It is shown that the surface of the fabric prepared in Example 1 can be observed as a birefringent island-in-the-sea yarn used as a warp yarn without yarn breakage. 0 Comparative Example 1> including PC and pCTG ratio of 5:5 The isotropic π alloy is used as the sea portion (ηχ eat 57, ny=1.57, nz=l 57, refining temperature = 145. 〇, and anisotropic PEN (nx=l 88, η=]57 _ ny 1· 57, η ζ = 157, melting initiation temperature = 262 ° C) is used as an island portion. In order to obtain a birefringent island-in-the-sea yarn having a cross section as shown in Fig. 2a, the materials are supplied to (d), which has a pattern as shown in Fig. 2b. The distribution plate is shown above. It is prepared to have a birefringent birefringent yarn (the monofilament, the number of islands is 1016 'straight skills' (four) as in the 5th. In the spinning speed _ 2·na% and spinning After preparing ρ〇γ (85 denier/12 monofilament) at a yarn degree of 290 C, ρ〇γ was stretched 2·1 times at 14〇〇c to prepare FY (40 denier/12 monofilament). Two strands of birefringent island-in-the-sea yarn FY40/12 of 80 Danny/24 monofilaments were used as warp yarns, and the same isotropic pc alloy fiber as the sea portion was used (melting temperature = 145. (:, ρ〇γ 6〇/24 ) weave the fabric as a weft yarn.

Figure 2c shows the SEM image of the surface of the fabric prepared in the comparative example. It has been observed that yarn breakage occurs in the birefringent island yarn as warp yarn. Since the luminance enhancement film disclosed in the present invention exhibits an excellent prior tone modulation effect, it can be widely used in optical devices such as a camera and an LCD device requiring high brightness such as a mobile phone, an LCD, an LEDTv, and the like. 32 201211594 The disclosure of the present invention has been described in terms of specific embodiments, and various changes and modifications may be made without departing from the following claims. The spirit of the tree and the invention may be changed to those skilled in the art. The above and other objects, features and advantages of the present invention are disclosed in the accompanying drawings. The scraped surface of the conventional birefringent island yarn; the second drawing is a sectional view of the birefringent island-in-the-sea yarn; the 31st is the upper distribution plate of the spinning nozzle of the birefringent island yarn of the second drawing; An electron microscope image of a birefringent island-in-the-sea yarn fabric comprising a second embodiment of Fig. 2a is an electron microscope image of a cross section of a specific embodiment according to the present invention; and Fig. 4 is a specific embodiment according to the present invention. , an electron microscope image of a face; FIG. 5 is a fabric of island yarn according to a specific embodiment of the present invention, for use in the light of the present invention - the brightness increase _ wide sea, the sixth figure is according to the present invention A specific cross-sectional view of the upper distribution plate for the island, y, and the spinning nozzle; and a seventh embodiment for producing a sea 33, the opening of the island yarn of the 201211594 island yarn according to the present invention The lower plate section view. It should be understood that the appended drawings are not necessarily to Specific design features of the present disclosure as disclosed herein, including, for example, particular dimensions, directionality, location, and shape, are to be determined to some extent by the particular intended application and use. In the figures, reference numerals indicate the same or equivalent parts of the various figures in the drawings. [Description of main components] 11 Spinning core 12 Island 20 Polymer injection unit 60 Fabric 61 Birefringent island yarn 62 Isotactic fiber 120 Upper distribution plate 121 Core 122 Island supply passage 123 Island supply unit 124 Island supply Unit 125 Sea Supply Unit 130 Lower Spinner Plate 131 Discharge Port 34 201211594 132 , 133 Flow Path 510 Core 520 , 530 Island Group 540 Boundary A, B, C Yarn Break

Claims (1)

201211594 VII. Patent application scope: 1. A brightness enhancement film comprising: at least: a substrate; and a birefringent island-in-the-sea yarn, which is located in a matrix, wherein birefringence is formed at a boundary between the island portion of the birefringent island yarn and the sea portion The interface is to induce optical modulation, and the birefringent island-in-the-sea yarn comprises: a core for preventing island agglutination; and a plurality of island groups surrounding the core to form a radial shape. 2. The brightness enhancement film of claim 1, wherein a boundary is formed between the group of islands such that the number of islands per unit area (μπι2) at the boundary is smaller than the area per unit area of the adjacent island group. The number of islands (μιη2), and the adjacent island group is separated by boundaries. 3. The brightness enhancement film of claim 2, wherein the boundary is broken around the core to become a light shot. 4. The brightness enhancement film according to claim 1, wherein the number of islands per unit area (μιη2) of the core is smaller than the number of islands per unit area (μπι2) of the island group. 5. The luminance enhancement film according to item 4 of the patent application, wherein the number of islands per unit area (μιη2) of the core is equal to or smaller than the number of islands per unit area (μιη2) in the island group. /2 or 1/3. 6. The brightness enhancement film of claim 3, wherein the boundary surrounds the core and is formed in a ring shape in plural. 7. The brightness enhancement film of claim 1, wherein the island group has a cross-sectional shape of a sector gear, an isosceles triangle or an isosceles trapezoid. 8. For the brightness enhancement film described in item 1 of the patent application, the number of the plurality of islands 36 201211594 is 10.5〇, 800-2000. And the number of islands in the island of the island is 9. The patented range is the first to refract the island of the island, and the brightness enhancement film is included in the double-application patent ^ Brightness enhancement film per unit area (_2); !=, where the number of islands at the boundary is the same as that of the island, such as the patent application J or less than 3/4 or 1/2. The island yarn has a degree-enhancing film, in which the double-ejection [Equation Magic] has an eight value of 500 or more: such as the number of monofilaments of the composite yarn. The island yarn is woven into a fabric, a :: degree reinforced film 'where birefringent island yarn, another - is::. The weft and warp yarns are birefringent. 13. If the scope of application is 丨14 = the degree of the part is higher than the birefringence. The brightness of the sea is increased, and its "refraction. For example, the 12th item of the material, the lining: the island yarn The island is optically anisotropic, and the sea part is = 16.ΓΠ:: the brightness enhancement film of the 12th item, wherein the fiber is selected from the group consisting of: mouth fiber, natural fiber and inorganic fiber. 37. The brightness enhancement film according to claim 12, wherein the melting initiation temperature of the island portion of the birefringent island-in-the-sea yarn is higher than the melting temperature of the sea portion. The brightness enhancement film according to Item 12, wherein the melting initiation temperature of the island portion of the birefringent island-in-the-sea yarn is higher than the melting temperature of the fiber by 3 〇〇 c or more. 19. As described in claim π Patent & The brightness enhancement film, wherein the luminescence initiation temperature of the island of the birefringent island is higher or higher than the melting temperature of the sea portion. 20. The brightness enhancement film according to claim 12, wherein the fiber is partially or Completely melted. The brightness increase according to the item, wherein the difference in refractive index between the matrix and the birefringent island in the biaxial direction is _ or less' and the refractive index difference between the matrix and the birefringent island-in-the-sea yarn in the residual-axis direction is 0.1 or more 22. The brightness enhancement film according to claim 1, wherein the sea portion and the island portion of the birefringent island-in-the-sea yarn have a refractive index difference of 0 05 or less in the biaxial direction, and the sea portion and the island of the birefringent island yarn are used. The difference in refractive index in the residual-axis direction is 0.1 or more. 23. The brightness enhancement enthalpy of claim 1, wherein the birefringent island-in-the-sea yarn has a diameter of 1 〇_1 〇〇 μηι.