TW201211593A - Luminance- enhanced film - Google Patents

Abstract

Disclosed is a luminance-enhanced film, more particularly a luminance-enhanced film with the broken filament improved by preventing breakage of the birefringent island-in-the-sea yarn. With no fibrous band occurring by preventing entanglement of birefringent island-in-the-sea yarns, the luminance-enhanced film has improved visibility. In addition, when the birefringent island-in-the-sea yarns are used as monofilaments or when they are composited as composite filaments, breakage of fiber during spinning or stretching can be prevented since only a few thick strands of fiber need to be composited, and thus broken filament can be prevented.

Description

201211593 VI. Description of the Invention: [Technical Field] The present invention relates to a brightness enhancement film, and more particularly to a brightness enhancement film comprising a birefringent island-in-the-sea yarn, which has a problem of broken monofilament It is solved by preventing the birefringence island yarn from breaking. [Prior Art] Liquid crystal displays (LCDs), projection displays, and plasma display panels (PDPs) have a strong market in the field of flat panel display TVs. We also expect Field Emission Display (FED), Electroluminescent Display (ELD), etc., to 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 201211593, the LCD device does not necessarily have high use efficiency for the light emitted by the backlight. Therefore, in order to increase the efficiency of use of the backlight light in the LCD device, a luminance enhancement film can 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 component via the luminance enhancement film, and the § 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 polarizer 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-sensitive 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, in which a flat optical layer having an anisotropic reflection coefficient and a flat optical layer having an isotropic reflection coefficient are alternately stacked in plural. That is, the light incident on the luminance enhancement film is reflected by the spolarized 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 reflective surface of the optical recess, and its state of polarization is random 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. 201211593 The conventional brightness enhancement film is manufactured by alternately stacking a plate-shaped isotropic optical layer and a flat-plate anisotropic optical layer having different refractive indices and performing an extension process on the stacked structure. The stacked layer has a refractive index and an optical thickness of the respective optical layers that are optimized for selective reflection and penetration of incident polarized light. Therefore, this manufacturing process is complicated. In particular, since each optical layer of the luminance enhancement film has a flat plate shape, the p-polarized light and the s-polarized light must be spaced apart from each other for a wide range of incident angles of the incident polarized light. Therefore, the structure of this film is stacked with an excessively increased number of optical layers, thus causing an exponential increase in manufacturing cost. Moreover, this structure has the disadvantage of causing optical loss, thus deteriorating optical performance. It has been found that a brightness enhancement film comprising a birefringent island-in-the-sea yarn in a matrix is extremely advantageous in solving the above problems. Specifically, when birefringent island-in-the-sea yarns are used, optical modulation efficiency and luminance can be remarkably improved as compared with the case of using general birefringent fibers. The island island of Yarn Island is anisotropic, while the sea is anisotropic. In this case, since the boundary between the island portion of the island yarn and the sea portion is a birefringent interface, in addition to being between the island yarn and the substrate, the birefringent interface is formed only on the substrate and compared with the general birefringent fiber. The boundary between the birefringent fibers, the optical modulation effect is significantly improved, which makes it possible to replace the stacked brightness enhancement film for industrial use. As a result, the use of birefringent island-in-the-sea yarns provides better brightness improvement than the use of conventional birefringent fibers. That is to say, the formation of the birefringent interface inside the birefringent island-in-the-sea yarn is caused by the different optical properties of the island and the sea, and provides a more remarkable brightness improvement. 201211593 The maximum m-fold ratio is maximized, preferably in the area of the birefringent interface existing in the island of the island. To this end, the number of islands in the island yarn should be large. In any case, ^ know ^: at least includes islands arranged concentrically around a spinning core. : = When the number is small, there is no problem with the structure of the section. However, the volume: the number of times (about one or more), due to the high density, in the spinning; the door: the island adjacent to the spinning core formed in the center of the island yarn can be coagulated: agglomerated). More specifically, the 'lb' shows a cross-sectional view of a conventional island-in-the-sea yarn comprising 331 islands. In the figure, in the island yarn, the island portion 12 is arranged concentrically around the spinning core 11 i and the island portion occupies 30% to 7 G% of the entire section of the island yarn. When the number of islands is small, the structure of these sections is not problematic. However, when the number of islands is large (about 300 or more), due to the high density, the portions adjacent to the spinning core i i formed at the center of the island yarn can be agglomerated during the spinning. In other words, when the number of islands on the island yarn increases, the aggregation of the islands in the center of the island yarn and the adverse side effects of agglomeration (island agglutination) are easy to occur. Therefore, due to the island/collision phenomenon, as the number of islands increases, the birefringent island-in-the-sea yarn having a general profile has a significantly reduced birefringence interface region, and the optical modulation efficiency cannot be improved as much as possible. Since the conventional birefringent island-in-the-sea yarn used for the luminance enhancement film has only 36-300 island portions having a diameter of 1〇_3〇μη and having a (10)·fine island portion, the birefringent island yarn monofilament has been twisted Become 7-144 shares (40 Danny / 12 monofilament to Danny / 144) to improve the fresh modulation efficiency of the material. Although the optical modulation efficiency is improved due to the increase of the birefringence interface, 201211593 pulls two: the medium fiber ribbon. Furthermore, when a crack is included in the crack, the yarn breaks, causing the broken monofilament. Since the strong film is used in the LCD, the reverse polarization effect occurs. When the brightness is increased. In addition, during the LI optical modulation efficiency is lowered and the absence of the defect causes the weaving of the island yarn (fabric manufacturing), the breaking sheet 4 causes poor opening, thereby causing poor workability of the weaving. Early [Summary of the Invention] The sea-providing-luminance (four) film ' does not cause a fiber band by preventing the entanglement of the double-fold island, :/. The disclosure of the present invention also points to providing a luminosity y ^ ^ ^ ^ ^ ^ ^ ^ rupture of the island-in-the-sea yarn without the occurrence of a rupture material strong film by preventing the double-folding of the human in the aspect of the invention. , the ^-matrix; and the birefringent island-in-the-sea yarn in the base f, and the birefringent interface 'is used to improve the 学 调 在 在 在 在 在 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少Equation 1] · A = - Number of islands of monofilament / Number of filaments of a composite yarn In the disclosed embodiment - the value of A may be 1 〇〇〇 or 'preferably 5000 or more, more preferably Is nnn or above. More preferably, it is 1 〇 or more, and even more preferably 20 _. In another embodiment of the present invention, the monofilament 201211593' of the birefringent island-in-the-sea yarn may have 1000 or more islands, preferably 5,000 or more. The island is better than the island of 10,000 or more, and the best is the island of 20,000 or more. In one embodiment of the present invention, the monofilament of the birefringent island-in-the-sea yarn may have a diameter of 30 μm or more, preferably 40 to 100 μm. In another embodiment of the present disclosure, the birefringent island-in-the-sea yarn can be 15-500 denier/1-6 monofilament. In another embodiment of the present disclosure, the birefringent island-in-the-sea yarn can be a monofilament or a 2-6 strand composite yarn. In another embodiment of the present disclosure, the birefringent island-in-the-sea yarn can be woven into a fabric, one of the weft and warp yarns of the fabric can be a birefringent island-in-the-sea yarn, and the other can be a fiber, and the island of birefringent island yarn The melting initiation temperature of the portion may be higher than the melting temperature of the fiber. 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. In a particular embodiment of the invention disclosed, the fibers can be optically isotropic 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 portion of the birefringent island-in-the-sea yarn may be higher than the melting temperature of the sea portion. More preferably, the melting initiation temperature of the island of the double-refraction island yarn may be 30 ° C or more higher than the melting temperature of the sea portion. 201211593 The illusion initiation temperature of the other part disclosed in the present invention can be embodied as an island of birefringent island yarn

The melting of the island island of the island of yarn is 'double fold or more. (10) The initial temperature of the chemical is higher than the melting temperature of the fiber by 30T. The part can be partially =: = another - the specific example of the 'birefringent island yarn of the sea island fried in the present hair _ show another - specific implementation, the island can be optical birefringence And the sea can be optically isotropic. In addition, the specific implementation, the base f and the birefringent sea: the refractive index difference in the axial direction may be (four) or less, and the difference in refractive index between the matrix and the birefringent island-in-the-sea yarn in the remaining axial direction . Specifically, it is assumed that the refractive indices of the matrix in the χ·, y-, and z-axis directions are ηχι, ηγι, and nZl′, respectively, and the refractive indices of the birefringent island-in-the-sea yarns in the X_, y-, and Ζ· axes are respectively For nX2, ηγ2, and nz2, at least one of the refractive indices of the matrix in the X and & axial directions may be the same as the refractive index of the birefringent island yarn. More specifically, it is possible to have the following relationship: nX2 &gt; nY2=n22 In another embodiment of the present disclosure, the refractive index difference between the sea portion of the birefringent island-in-the-sea yarn and the island portion in the biaxial direction is 〇 〇5 or less, and the difference in refractive index between the sea portion of the birefringent island-in-the-sea yarn and the island portion in the remaining one-axis direction is 0.1 or more. More specifically, it is assumed that the refractive index of the island portion of the birefringent island-in-the-sea yarn in the χ_(longitudinal) 201211593, y-, and z-axis directions is divided into X-, y-, and z-axis directions...ηχ3 ηγ3 and 3, and the sea-based matrix in the X-, y- and Μ by: the rate is η χ 4, ~ and kiss, then the island of yarn has the same refractive index. At least the ratio of the radiance can be different from the absolute value of the birefringence (the difference between the refractive index kiss and the η Χ 4 in the U-f is another in the present invention - and the sea-removed object (four) gives the island yarn in the present The invention discloses another and weave so that the birefringent island-in-the-sea yarn is more asymmetrical than the fiber, and here (10) the term will give a description of the technique. And the two π:: ϊ birefringence means that when the light is irradiated Refraction in two different directions in different directions. The light rays that are incident on the fibers are in the two-isometric, and the optical properties of the article are the optical properties of the article. When the light passes through the object 4' the refractive index of the article in all directions The same is true. The opposite of the optical properties of the heterogeneous object is the isotropic. I first learn to mean - a kind of program reflection, refraction or scattering, or its strong family, ", shoot First, the term "single-replacement clothing or characteristics are changed. The stock soap 4" is a kind of fiber formed by the private soap. It is spun from a spinning spout and is twisted by twists and turns. Bu 4 soap version, and is used for winding. Only, for example, heart &quot;4" is a monofilament of - or more The resulting iron dimension is rotated or bridged, for example, such that the different capillary or island portions of the distribution plate that have passed through the spinning nozzle are not included in the fiber that is bonded before the extrusion for spinning after 201211593 Therefore, the birefringent island-in-the-sea yarn having the fine fiber island portion is a monofilament rather than a composite yarn because the fine fiber island portion has passed through different spinning nozzles, and then combined before spinning to form a pair. Refraction island yarn. The term "fractured monofilament" refers to the defect caused by the breakage of some strands of the fibers constituting the composite yarn. The term "spinning core" means a reference to the island yarn in the longitudinal section of the island yarn. At a specific point of the point, the islands surrounding the point are divided into groups (divisionalization). The term "standard spinning core" refers to the spinning core as the center; and the term "peripheral spinning core" means surrounding The remaining spinning cores of the standard spinning core, which are plural and arranged around a spinning core. The phrase "arrange the islands in groups" means the islands in the island yarn. ring The state of being arranged around a spinning core is arranged in such a manner that the islands are separated into groups having a predetermined shape. For example, when there are two spinning cores in the island yarn, the islands are predetermined The shape is arranged around each of the spinning cores, so that the islands are divided into two groups in the island yarn. The term "melting initiation temperature" means the temperature at which the polymer begins to melt, and the term "melting temperature" means melting. The fastest temperature occurs. Therefore, when the melting temperature of the polymer is observed by Differential Scanning Calorimetry (DSC), the temperature at the start of the melting endotherm is the melting onset temperature and corresponds to the top of the endothermic peak. The temperature is fused 12 201211593. The brightness of the birefringence island yarn is improved. The H R1 π is further defined because the entangled monofilament of the birefringent island yarn (monofilament) does not occur or In addition, when the _ birefringent island yarn is used as two composite yarns, it is composited due to only some coarse strands of fibers, and can be prevented from being broken, and can be broken or pulled. During the stretching, the fiber breaks, and because of the light wind, because of the anti-polarization effect, the efficiency of the nine-dimensional modulation can be improved, and the improved brightness is increased by _ _ because the luminance enhancement film has no defects and can be displayed # θι ^ ^ J , Exterior. Furthermore, since it is not opened during weaving. This interrupts the movement of the weft yarn, so that the woven workability can be improved. Other features and aspects of the invention are apparent from the following detailed description, drawings and claims. Circles [Embodiment] The advantages, features, and aspects of the present invention will be apparent from the following description of the specific embodiments. The present invention reveals that the "how" may not be embodied and should not be construed as being limited to the specific embodiments herein. The specific embodiments are provided to provide a thorough and complete disclosure and will be fully conveyed to the disclosure of the present invention. The terminology used herein is used merely to describe A\. The examples are not intended to limit the specific embodiments. As used herein, the <RTI ID=0.0>" </ RTI> </ RTI> </ RTI> and "the" are intended to include the plural, unless the context clearly dictates otherwise. It is further understood that the term "at least, including" when referring to the specification indicates the presence of the feature, integer 201211593, steps, operations, components and/or components, but does not exclude the presence or addition of one or more other features, integers, steps. , operations, components, components, and/or groups. Exemplary embodiments are described in detail below with reference to the accompanying drawings. As described above, island agglutination occurs in a conventional birefringent island-in-the-sea yarn which is used for a brightness enhancement film having 100 to 300 island portions. Birefringent island-in-the-sea yarn (monofilament) having a diameter of 1〇-3〇μΠ1 and having 36_3 islands twisted into 7-η Γ strands (40 denier m filaments to 500 denier/144 filaments) Department, used to improve the optical modulation efficiency in commercial applications, because the number of islands> _ ─   due to the increase in birefringence interface improved optical modulation efficiency 'in the composite birefringence island yarn, _ _ When the reinforcing film is entangled as a monofilament, the fiber ribbon is still prone to occur. In addition, when the material of the root strand is stretched, some of the material may break (the yarn breaks), causing the broken monofilament. The reverse direction effect occurs due to fiber orientation changes caused by yarn breakage. This leads to a decrease in the optical scale and a defect in the film. Furthermore, the problem with the 'fractured monofilaments' is that the broken fibers are caught by the body and radius of the weft machine heald during the weaving (weaving) of the birefringent island-in-the-sea yarn, thus causing poor woven workability. A spinning nozzle has been disclosed in the Korean Patent Application No. 2-910138 for the preparation of 'island yarns. Specifically, Fig. 2 shows a cross section of the spun nozzle. The spun nozzle includes at least a polymer injection unit 2 that emits an island portion and a sea portion polymer. Fig. 3 shows the distribution plate 30 above the spout. A plurality of blister ejection units 31 are formed to spin a plurality of birefringent sea island yarns. Here, the lower spinner plate (Fig. 4) has a polymer with an upper sub-plate 30 formed in the spun nozzle 201211593 (for example, the number of polymer ejection ports is the same as the polymer row if ^. number a) The discharge ports 41, 42, 43 corresponding to the injection unit 31 can thus damage the birefringence island map having the island portion. As shown in Fig. 2, the island-in-the-sea yarn can be prepared from the polymer injection unit (Fig. 5 and as shown in Fig. 3, a plurality of island yarns can be produced from a plurality of polymers. In other words, The distributor plate on the spinning nozzle shown in Fig. 3 can have a series of 2·2 () polymer injection units shown in Fig. 2, which are arranged in a string or a flat file. For example, if there are 12 distribution plates on the spinning nozzle, The polymer injection unit (Fig. 3) can damage 12 individual discharge ports 4, 42, 43 (Fig. 4) corresponding to the respective polymer ejection units of the upper distribution plate of the nozzle. The lower nozzle plate is coupled and coupled to form a spinning nozzle. As a result, the birefringent island-in-the-sea yarn shown in Fig. 5 (the number of monofilament islands = 1 〇 16 pieces, the diameter of the monofilament = 19 is used - the mouth can be spun into 12 4. However, 'the birefringent sea ^ ν (monofilament) of the 16 islands shown in Fig. 5 is only a monofilament (diameter, (4) and has a low optical modulation effect, which is prepared as 40 denier / 12 monofilament (strand), 80 / 24 (Danny / σ,,) complex S, 复合 and composite yarn is woven into a weft or warp fabric: and used for brightness enhancement Specifically, 'Fig. 6 and Fig. 7, the fabric obtained from the composite 5th W birefringent island yarn (material). 6G 'and woven into weft or warp. By composite-birefringence island The yarn 61 is 8 〇/24 (Danny/monofilament) as a warp yarn, and the composite-isotropic fiber 62 is used as a weft yarn to prepare a woven fabric 6G which is woven. As a result, although the optical 5-week change efficiency is improved, Due to the small monofilament diameter and a large number of wire openings, the fracture (the a, b, c in Fig. 6) causes the broken monofilament. 15 201211593 The present invention provides a brightness enhancement film comprising: The inside of the matrix - the birefringent island yarn position and the sea part of the bird at least - /, in the middle of the island

The letter A5_ is determined to have a different refractive index and the value of A defined by Equation 1 is 咏m. As a result, the wrap and the yarn are broken, so that the f 4 is not corrected. Therefore, the defect of the strong solar film is improved and the luminance of the uniform sentence can be maintained without the problem of reverse polarization. - [Equation 1] A = number of islands of a single filament / number of filaments of a composite yarn, which is a composite of 5 strands of birefringent island-in-the-sea yarns having 300 islands, or will have 1 () The customary 12-strand birefringent island yarn of 16 islands is compounded. In this case, the A values are only 6 and 84, respectively, much less than 500. Also, 48 strands of birefringent island-in-the-sea yarns with 127 islands are compounded, or 8 strands of birefringence with 297 islands. The island yarn is compounded. In this case, the A values are only 2.6 and 37.1 each, which is much smaller than 5 〇〇. In contrast, when using a birefringent island yarn with 12,192 islands (1 share), 6,096 islands (2 shares), 2,504 islands (1 share), or 5008 islands (5 shares), then A The values are 12192, 3〇48, 25〇4〇 and 1001.6, which are much larger than 500. Compared with the case when a number of strands are compounded, since the use of a monofilament significantly reduces the risk of entanglement and breaking of the filaments due to yarn breakage, we prefer to use the birefringent island-in-the-sea yarn's A value. It is 1000 or more, 10000 or more, or 20,000 or more. A monofilament of the birefringent island-in-the-sea yarn having the most or more islands, or a composite yarn of about 2 strands, can be used to effectively avoid fiber entanglement and breakage of the monofilament. If a single record with a different number of islands is combined (for example, if 201211593 will have 8 monofilaments with 297 islands and a composite of 127 islands), the average number can be defined as a monofilament. Number of islands. When a 丨_2 strand birefringent island-in-the-sea yarn having 1016 islands is used, although the value of A satisfies the above, the optical cost efficiency is lowered due to a significant reduction in the area of the birefringent interface. Therefore, in a specific embodiment of the age of the present invention, the composite yarn of the birefringent island-in-the-sea yarn may have one or more island portions. The number of islands of the monofilament of the birefringent island yarn may be 5 〇 〇 or more, more preferably 10,000 or more, and most preferably 20,000 or more. In a specific embodiment disclosed in the following month, the monofilament of the birefringent island-in-the-sea yarn may have a diameter of 30 μm or more. When the diameter of the monofilament is less than 3 〇μηι, monofilament anger or yarn breakage may occur between the two stretches d (see the examples). Specifically: the monofilament of the birefringent island yarn can have a diameter of 4 (M Qing m. In this example, the composite island yarn can be 6 said Danny Μ = Danny Danieli 4 monofilament. When the birefringent island-in-the-sea yarn is smaller and the cracking of the polymer material occurs due to the increase of the hysteresis (four), the spinning efficiency is not full, and, after 60 denier, the curing after spinning: Shi Ba vortex and the field exceeds the excessive fluidity, and when the f-w is caused by the fiber strands, the spinning performance is in the spinning/swinging, and the yarn breakage occurs when the composite is greater than 7 as the core or the stretching. , ^ ^ ^ 2 and 3 ® each indicate - the injection unit and - a plurality of injection units for preparing the nozzle, using the above-mentioned upper distribution plate and the 4th = 2: 2138 island yarn. The figure shows a pair of islands in the form of a pair of islands in the form of a spun yarn, such as the first island of the island. The disclosure of the Korean Patent Application No. 17 201211593, the disclosure of which is incorporated herein by reference. The lower nozzle plate is shown in Fig. 8, wherein the n individual discharge ports are merged into a row of outlets instead of using the lower one shown in Fig. 4. For the spinning of a birefringent island yarn, a birefringent island-in-the-sea yarn (monofilament) having 12192 islands and a diameter of 66 μm as shown in Fig. 9 can be prepared. [Korean Patent Application No. 2010] The disclosure of the '0028219 is incorporated herein by reference. However, the disclosure of the present invention is not limited thereto, but the island-in-the-sea yarn can be prepared using a variety of simple mouth patterns. [8] Figure 8 is a disclosure according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT, A cross-sectional view of a lower spinner plate for preparing a spinning nozzle of a sea-island yarn. The flow channels 820, 821 are formed so that the polyss supplied by the individual polymer injection units of the distribution plate above the spinning nozzle can flow. - Discharge port (4). The flow passages may vary in number, and depending on the type. Through the discharge port 81, the polymer that has flowed through the flow passages 82, 821 is finally discharged. The number of polymer injection units / is optimally formed - the outlet is discussed. Figure 9 shows the island yarn (monofilament) spun by the spinning nozzle, which has the diameter of the island and the diameter of the ΙΟΟμιη. 9 maps of the island yarn have a loose space The island here is not concentrated in the center of the towel, so island agglutination does not occur. As is generally used to prepare the spinning nozzle of the island yarn, the level σ of the spinning nozzle disclosed in the present invention has a funnel shape, wherein The distribution plate above the spinning nozzle can have a circular shape on the spinneret until the diameter of the distribution plate above the spun yarn is discharged. However, according to the desired shape of the island yarn, the material can be set. When the profile is circular, although the diameter of the island yarn is 201211593, the diameter of the upper distribution plate is preferably 7〇j5〇mm, and the upper distribution plate may have a thickness of 1〇-30mm. However, there is no limitation here. In general, the diameter of the lower spinner plate may be equal to or smaller than the diameter of the upper distribution plate. The discharge outlet diameter may be 2-.2-1.0 mm, the flow passage length may be 4〇_12〇mm, and the flow passage width may be 4-l〇mm. However, there is no restriction here. According to the specifications of the island yarn, the spinning nozzles can have different designs. 1st and 11th are the monofilaments (unordered composite) of the birefringent island-in-the-sea yarn of Fig. 9 as the warp yarn 1 (n, and an isotropic fiber as the weft (10) woven fabric 1 () ( The optical microscopy image of the birefringent island-in-the-sea yarn that satisfies the above range is different from the one that cannot satisfy the diameter range: no broken yarn or broken monofilament, and the birefringent island yarn (monofilament) shown in Fig. 9. For example only, and =T upper and lower plates, and the birefringent islands can be made of different sizes and thicknesses. For example, when using one with eight mouths to damage the monofilaments with i islands , by the use of - row t can be made, with 9600 islands of birefringent island yarn (monofilament). Yi Tian uses the distribution plate shown in Figure 3 and the mouth plate shown in Figure 8, so that When the island yarn is refracted for spinning, if the island yarn has an island portion, as shown in Fig. 3, if the sheaths are arranged along the spinning core, the spinning is difficult because the sheath is closely concentrated. Therefore, in the present invention, the specific embodiment is used to prepare the island spinning nozzle configuration as shown in FIG. Figure 13 to solve this problem. Guan 2 this point 'Korean Patent Application No. 2G1G.767G is hereby for reference. However, 'it is only an example, and according to the purpose, the spinning nozzle can have ^ 201211593 The same design. Fig. 12 shows a section of a distribution plate 12A on a spinning nozzle for preparing a sea-island yarn according to a specific embodiment of the present invention. The upper distribution plate 120 includes at least a core unit. 122, which is formed at the center and prevents island agglutination 'a plurality of island supply units 121 are formed lightly around the core unit 122, and have - island supply passages 124 formed therebetween - a plurality of sea supply units 123 surround the island The periphery of the supply unit m is formed and includes at least a plurality of sea supply channels. The island supply unit 121 to/includes a plurality of island supply passages 124. Since approximately 800_14 (8) island supply passages 124 can be formed in an island supply In the unit 121, if the 1252 portion supply passage 124 is formed in the island portion supply single phantom 21, and the number of the island portion supply unit ～ unit 121 is 2 ,, the birefringent island of the spinning and about 25,000 island portions are formed. Again The island supply unit 121 may be surrounded by the sea supply unit 123 in the upper plate of the pizza shape for preparing the spun yarn of a sea-island yarn, and the core unit 122 of the spun may have no island supply unit. The sea can easily penetrate the island and the center, where the conventional spinning nozzle used to prepare a sea-island yarn is still a problem of middle agglutination. ^As long as the island yarn is prepared and the island agglutination is suppressed If feasible, the number of sea supply channels in a sea otter supply unit is not _, but may be the same according to the required specifications of the island 2. Specifically, one supply unit may have 3:25 sea supply channels. And the total number of sea channel supply channels can be (9). The sea portion 20 201211593 can be provided with 20-500 sea portion supply passages around the periphery of the core 4 122. According to the composition of the island yarn, the direct supply of the island supply channel and the sea supply channel can be different. Specifically, the island supply passage may have a diameter of 0.13, and the sea supply passage may have a straight diameter f of 22.2 mm, which is not limited here. Although the upper distribution plate of the spout may have a circular cross-section, the cross-sectional shape of the upper distribution plate may vary depending on the desired shape of the island-in-the-sea yarn. If the profile has a round shape, the diameter of the upper distribution plate may vary depending on the desired diameter of the island yarn. Specifically, the diameter may be 70-250 mm. Further, the upper distribution plate may have a thickness of from 1 to 30 mm, but is not limited thereto. Figure 13 shows a lower spinner plate in accordance with an embodiment of the present invention. The lower spinner plate can be coupled to the upper distribution plate shown in FIG. Specifically, the polymer supplied from the island portion supply unit 121 and the sea portion supply unit 123 can be collected at the discharge port 132 after passing through the flow path 131 for spinning. The lower spinneret discharge port may have a diameter of 0.2 to 1.0 mm, and the flow path may have a length of 40 to 120 mm and a width of 3 to 10 mm. The width of the lower spinneret plate may be equal to or less than the width of the upper distribution plate and the length is 3-30 mm, but there is no limitation here. Furthermore, additional distribution plates can be placed on the upper and/or lower sides of the upper distribution plate to facilitate the distribution and mixing of the islands and the sea. Figure 14 shows the monofilament of the double-dip island yarn prepared by a spinning nozzle (the number of islands = 25040, diameter = 66.5 μιη). The reading spun at least includes the upper distribution plate as shown in Fig. 12 and The mouthpiece is shown below in Figure 13. Although the number of islands exceeds 20,000, island agglutination does not occur. 21 201211593 The figure shows the use of the birefringent island-in-the-sea yarn (monofilament) shown in Fig. 14 as a warp yarn, and the use of an isotropic fiber as a weft-woven fabric. We can confirm that there is no broken monofilament or yarn breakage in the birefringent island yarn. The above-mentioned technical features for producing a birefringent island-in-the-sea yarn are characterized by an upper distribution plate and a lower spinner plate. The coupling of the upper distribution plate, the lower spinneret plate and other structures may be the same as those of other conventional spinning nozzles used to make island-in-the-sea yarns. The spinning nozzle for preparing a birefringent island yarn and the preparation of the birefringent island yarn using the spinning nozzle are merely illustrative. In fact, the birefringent sea island yarn satisfying Equation 1 can be prepared in different ways. When the birefringent island-in-the-sea yarn satisfies Equation 1, a brightness enhancement film including at least the birefringent island-in-the-sea yarns has an improved appearance quality because entanglement of birefringent island-in-the-sea yarns (monofilaments) does not occur, and thus no fiber ribbon form. Furthermore, since the birefringent island-in-the-sea yarn can be used as a monofilament or combined with some coarse strands, yarn breakage can be avoided during spinning or stretching. Therefore, the broken monofilament can be avoided. Therefore, since the reverse polarization effect does not occur, the optical modulation efficiency can be maintained and the appearance quality of the luminance enhancement film can be remarkably improved. Furthermore, since the interruption of the weft movement caused by the opening problem does not occur, the woven workability can be improved. Although the birefringent island-in-the-sea yarns are combined as they are into one luminance enhancement film, the birefringent island-in-the-sea yarn can be easily moved (e.g., entangled) during, for example, lamination. Since the fabric including the birefringent island-in-the-sea yarn is woven, the fabric is laminated at the base = to repair the birefringence sea. However, if the birefringent island-in-the-sea yarn is incorporated into the luminance enhancement film to become a fabric fork, the liquid crystal display (LCD) is formed even if it is composed. The fabric (fiber) is visible when it is illuminated from the outside. Therefore, there are great obstacles to commercialization. Therefore, in order to solve the above problems, the present invention provides a brightness enhancement film comprising at least a fabric in which one of a weft yarn and a noisy fabric is double, a sea-island yarn, and the other side is a fiber, and The melting initiation temperature of the island of the island of refraction is higher than the melting temperature of the fiber. First, the fabric included in the luminance enhancement film can be referred to in Fig. 10 for a photograph of the fabric disclosed in the present invention. The iron 1 includes at least the weft yarn 102 and the warp yarn 101. One of the weft yarns 102 and the warp yarns 101 is a birefringent island-in-the-sea yarn, and the other one is a fiber. In other words, when a yttrium birefringent island yarn is used as the weft yarn 102, a fiber is used as the warp yarn 101. And when the birefringent island-in-the-sea yarn is used as the warp yarn 101', the fiber is used as the weft yarn 102. The weft and warp yarns constituting the fabric can be weiming or half (four) shots to pass the light. The dashed starting temperature of the island island of the birefringent island is higher than the melting temperature of the fiber. Therefore, 'when heat and/or pressure is applied to laminate the fabric with the substrate, and the temperature is at the temperature of the melting of the fiber and the initial temperature of the island, since the temperature has not yet reached the melting initiation temperature, the island is still booted. However, the fiber has been partially: ΐ = two: the fiber of the weft or warp, the birefringent sea 2 "丨之 / 卩 77 ' is only the birefringence island V inside the obtained brightness enhancement film. ,,,. If the fiber is visible, use an additional adhesive. Therefore, the island portion of the 'birefringent island-in-the-sea yarn can have a grafting initiation temperature south of the melting temperature of the fiber. Specifically, the melting initiation temperature of the island of the island of the birefringent sea 23 201211593 may be higher than the fiber melting temperature by 3 〇〇 c or more, more preferably 50 ° C or more. At the same time, the melting initiation temperature of the island of the birefringent island yarn may be higher than the melting temperature of the sea, and it is more preferable that the melting initiation temperature of the island of the birefringent island yarn is 30 V or more higher than the melting temperature of the sea portion. As a result, since the sea portion of the birefringent island yarn can be partially or completely melted, the problem of fiber visibility can be improved, and the fabric can be adhered to the substrate without using an additional adhesive. In a specific embodiment of the present invention, the melting initiation temperature of the island portion of the birefringent island-in-the-sea yarn may be 130-430 ° C, and the melting temperature of the isotropic fiber may be 100 400 C, and the melting of the sea portion of the birefringent island yarn is The temperature can be 100-400%, and the lamination temperature can be 丨00_42 (rc, but there is no limitation here. The conclusion is that the melting temperature of the isotropic fiber used as the weft or warp of the fabric is lower than that of the warp. Or the melting initiation temperature of the birefringent island-in-the-sea yarn of the weft yarn. When the four layers are at a temperature between the melting initiation temperature of the isotropic fiber and the melting temperature of the birefringent island yarn, the fabric of the fabric is included. Strong film can solve the fiber visibility problem, because the isotropic fiber ^ or all melted. In addition, the sea portion of the birefringent island yarn (4) is heated at the island starting temperature, if the lamination is between The temperature of the two rooms is 'partial or fully hybrid' to provide interlayer adhesion: no additional adhesive is required. In another embodiment of the invention, the fabric may be woven to make birefringent island yarn More exposed to the surface than the fiber For the fabric surface, it refers to any surface on both sides of the fabric. Here, the warp and weft of the fabric structure have less twisting, and float to the surface after 24 201211593. The fabric pattern with a 1 ί reading and a weft yarn left and left in the brightness enhancement film is the most +. The fabric can make the residue track. The fabric can be laminated via a twist comprising a vacuum C yarn and a twisted yarn. This method is often too strong in brightness = method and matrix. If vacuum hot laminate, we are looking forward to it. For example, after that, the birefringent yarn is melted to lose the state of the yarn x hot laminate process. The pressure of the spine causes a double fold Y, in the twisted point of the weft yarn and the warp yarn, to be generated by hot pressing, thereby leaving a pattern on the brightness enhancement film. The skein form changes the ripple phenomenon on the screen, and this phenomenon can be asymmetrically woven into 2 in the refractive island yarn more exposed to the surface than the fiber. Solve, so that the matrix 'matrix' can be made of thermoplastic or thermoset poly, which can transfer light wavelengths to the desired range, which can be used to make twisted or translucent materials. In particular, the easily penetrable f' can be a homopolymer, a copolymer or a mixture thereof. Carbonate (PC); paired and homogenous polystyrene (PS); alkyl benzoquinone alkyl, aromatic or alicyclic (meth) acrylates, such as polyethyl acrylate ( ΡΜΜΑ) and ΡΜΜΑ copolymer; (meth) hexyl acrylate and propanolate; polyfunctional (meth) acrylate; acrylated epoxy resin; epoxy resin, other ethylene and compounds; Sparse hydrocarbon and cyclofflower copolymer; acrylonitrile-butadiene-styrene (ABS); styrene acrylonitrile (SAN) copolymer; polyvinyl cyclohexane; ruthenium/polyvinyl fluoride blend; Phenyl ether alloy; styrene block copolymer; polyimine; polysulfone; polyvinyl chloride; polydimethyl siloxane (PDMS); polyurethane; unsaturated polyester; polyethylene 25 201211593 Polypropylene (PP); polyalkyl phthalate, such as polyethylene terephthalate (PET); polyalkyl naphthalate, such as polyethylene naphthalate (PEN); polydecylamine Ionic polymer; vinyl acetate/polyethylene copolymer; cellulose acetate; cellulose acetate butyrate; fluoropolymer; polystyrene polyethylene copolymer; PET and PEN copolymer For example, polyolefin PET and PEN; and polycarbonate/aliphatic 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), polymethyl 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 (EVA), polyamine (PA), poly (oxygen) (P0M), polyphenol, epoxy (EP), urea (UF), melamine (MF), no Saturated polyester (UP), bismuth (si), elastomer, and cyclic olefin polymer (COP, Japan ZE0N Co., Ltd., and Japan JSR Co., Ltd.), which may be used singly or in combination. More specifically, the substrate may be constructed of the same 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 thermal stabilizer, a lubricant, a dispersant, a UV absorber, and a white color. Pigment, and glory brightener. 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, in the lamination process, the matrix can be partially melted completely, so that the adhesion between the birefringent island-in-the-sea yarn and the substrate can be improved without using an adhesive other than the amount 201211593. The matrix can comprise three layers. Specifically, the three layers may be formed to have a stacked structure including a surface layer (B 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 and/or fibers to enhance adhesion to the birefringent island yarn. The core layer may be made of a material having a higher melting temperature than the sea portion and/or the fiber to prevent deformation of the substrate due to heat generated by the lamp. Next, fibers which can be used as weft or warp yarns of the fabric will be described. Any fiber ' can be used as long as it can be woven with a birefringent island-in-the-sea yarn to form a fabric and meets the above-mentioned temperature requirements, and is not limited to the fiber type. Specifically, the fibers may be optically isotropic when it is considered to woven the fibers perpendicular to the birefringent island-in-the-sea yarn. This is because if the fiber is also (4) = Sexuality, the light modulated by the birefringent island yarn may not pass the °. More specifically, the fiber may be the same material as the sea of the birefringent island yarn. Furthermore, in the present invention, the double-precision me, _ otherwise, the refractive index of the sea portion of the birefringent island-in-the-sea yarn may be the same as the refractive index of the matrix. Two:: The description can be used as the birefringence island of the weft or warp of the fabric. So that the light wind W island scarf &amp; and the sea can have different optical properties: to maximize the efficiency of the first learning modulation. More specific and the sea can be isotropic.丨 为 异 = = = = = = = = = = = = = = = = = = = = : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : In general, the scattering performance 27 201211593 varies proportionally with the square of the difference in refractive index. Therefore, the light polarized along the axis will scatter more strongly as the difference in refractive index at a particular axis increases. In another aspect, the difference in refractive index at a particular axis is small, and the light polarized along the axis is weakly scattered. When the refractive index of the sea portion of a particular axis is substantially equal to the refractive index of the island portion, regardless of the size, shape and density of the island-in-the-sea yarn, the incident light that is polarized by the electric field and parallel to the axis may pass through the island yarn without being scattering. More specifically, the P-wave (through the island yarn in a solid line is not 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 s_wave ( Represented by the Lu line) is affected by the interface between the matrix and the birefringent island-in-the-sea yarn and/or the interface between the island and the sea of the birefringent island yarn, and thus is optically modulated. The above optical modulation phenomenon mainly occurs in the matrix and the double Refraction of the interface between the island yarns and/or the interface between the islands of the birefringent island yarn and the sea. In terms of the body, when the matrix is optically isotropic, as in the case of general physics, the matrix and birefringent island yarns occur. The interface between the two is: body: Lu's refraction in the biaxial direction between the matrix and the island yarn (4) 0.05 or less, and the difference in refractive index in the remaining one axis direction 〇 1 = above. More specifically, 'assuming the matrix is in Χ _, The refractive index of the Μ z_axis direction is ηχι, ηγι, and nzl, respectively, and the refractive index of the birefringent island-in-the-sea yarn is nX2, ηγ2, and nz2 'substrate at: = at least the refractive index - and the birefringent island yarn The same as δ, can have the following relationship: ΧΧ2&gt;ηγ produces nz2〇"" At the same time, in the birefringent island yarn, the island and the sea can be optically formed to form a birefringent interface. Stars /, different, body and tongue, when the island is anisotropic 28 201211593 Boundary =::_ can form birefringence below the boundary between the island and the sea, :: 差异 The difference in refractive index in the biaxial direction can be 0.05 or above. The difference in refractive index in the direction of the ^ axis can be w Or in the case of two =, the P-wave passes through the birefringence interface of the island yarn, and the s-wave is used for more detail (four), the false refraction of the sea in the Bohai tTz • (four) Che Wu ^, post and kiss, η; The refractive index of the axis of the mandrel is different. J is the kiss, (four), and the birefringence of 'good X-, y_, and ζ&quot;&quot; at least one of the refractive indices in the axial direction can be the same as the = fold, the island yarn. The absolute value of the difference between the ratios ηχ3 and ηχ4 can be two. More specifically, when the difference between the vertical β refractive index of the sea portion and the island portion of the island yarn is 0J or more and the refractive index of the sea and the island in the remaining two axes is The f-phase material maximizes the efficiency of optical modulation. At the same time, when the earth/birefringent island yarn has a phase in the sea In the case of the refractive index, the optical modulation efficiency can be easily improved. In order to improve the optical modulation efficiency, it is possible to select a birefringence in which the refractive index difference between the island portion and the sea portion in the longitudinal direction is large, and at the same time, the other two axes have substantially the same refractive index. Island yarn. The sea and / or island of the birefringent island yarn can be made of polyethylene naphthalate (PEN), copolymerized naphthalene diacetate (c〇_pEN), polyethylene terephthalate ( PET), polycarbonate (ρ〇, polycarbonate (pC) alloy, polystyrene (ps), heat-resistant polystyrene (PS), poly(meth) methacrylate (PMMA), poly(p-butyl phthalate) Ester (PBT), Polypropylene (PP), Polyethylene (PE), Acrylonitrile Butadiene Styrene (ABS), Polyurethane (PU), Polyimine (PI), Gas Ethylene (PVC), styrene acrylonitrile (SAN) blend, ethylene vinyl acetate 29 201211593 (EVA), polyamine (PA), poly shrink (P0M), polyphenol, epoxy (Ep) Urea (UF), melamine (MF), unsaturated polyester (UP), cerium (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 portion of the birefringent island yarn, and copolymerized naphthalene diacetate, polycarbonate alloy or a combination thereof is used. For the material of the sea, the brightness can be greatly improved compared to the birefringent island yarn made of a common material. Particularly when a polycarbonate 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 polycarbonate and a modified poly(p-butylene phthalate) (PCTG). More specifically, the use of at least polycarbonate and modified polyparasinic acid cyclohexyldiiminodecyl diol (PCTG) and a weight ratio of 15:85 to 85:15 Ester alloy, which can effectively enhance the brightness. When the amount of the polycarbonate is less than 15%, the viscosity of the known compound required for the spinning is excessively increased, and there is a disadvantage that the spinning machine cannot be used. And when the amount of the polycarbonate is more than 85%, the glass transition temperature increases and the spinning tension increases after the nozzle is ejected, so it becomes difficult to ensure the spinning performance is optimal. The use includes at least polycarbonate and modification. The poly(p-nonanoic acid) is a polycarbonate alloy of 4:6 to 6:4 in a weight ratio of cyclohexyldifluorenyl S-diol (PCTG), which is effective for enhancing the luminance. Furthermore, in view of the efficiency improvement of the optical modulation efficiency, it is preferable that the island portion and the sea portion are selected to have a large refractive index difference in the longitudinal direction 201211593 and substantially the same in the other two axes: the isotropic material is modified into a birefringent material. The method is in the art::: well known. For example, 'polymer molecules can be oriented, so when 1 is stretched under suitable temperature conditions, it will become birefringent. W, 〃 In the present invention, the brightness disclosed in the present invention is strong; the surface layer can be structured. More specifically, the dim layer may be formed on the side of the emitted light. The structured surface layer can be in the form of a prism, a lenticular lens or a convex lens. More specifically, the light-emitting side of the luminance enhancement film may have a curved surface in the form of a convex lens. The surface can focus or defocus the light that passes through the surface. x, which emits a light meter and a mirror pattern. 〃 Next, a method of preparing the luminance enhancement film disclosed in the present invention will be described. First, after the above fabric is woven, the fabric may be disposed between the substrates and thereafter laminated. The lamination can be carried out by, for example, a winding or hot pressing procedure. Specifically, in order to prevent foaming, hot pressing can be performed under vacuum, whereby the adhesion and the luminance can be improved. Specifically, the degree of vacuum during hot pressing may be 5_5 Torr, the applied pressure may be i.O-iOOkgf/cm2, and the treatment time may be minutes. As described in detail above, the lamination temperature can be appropriately selected between the stimuli onset temperature of the island portion of the birefringent island-in-the-sea yarn and the melting temperature of the fiber and/or sea portion. When the degree of vacuum is less than 5 Torr, the process efficiency is unsatisfactory. When it is larger than 5 Torr, the defoaming is not sufficient. When the applied pressure is less than 1 〇kgf/cm2, the film adhesion is insufficient, and when the pressure exceeds WOkgf/cm2, the fiber arrangement is interrupted due to the excessive pressure. When the treatment time is less than 1 minute, the defoaming is followed by insufficient. And when the processing time exceeds 3 minutes, the efficiency of the process is not satisfactory. The brightness enhancement film disclosed in the present invention comprises at least a release film which can be easily attached and detached on one side or both sides of the brightness enhancement film to protect the surface. In order to increase the haze value and prevent visibility problems of the luminance enhancement film, a structured surface is formed on the luminance enhancement film. The structured surface can be a continuous three-dimensional pattern of 稜鏡, hemisphere, and the like. However, when a three-dimensional structure is formed to form a single crucible, for example, on a roll, pressure is applied to the brightness enhancement film to form a structured surface on the brightness enhancement film, and the release film is adhered to the brightness enhancement layer. The pressure on the release film may not be accurately transferred to the surface of the brightness enhancement film, causing haze reduction and visibility problems of the brightness enhancement film. Therefore, in order to solve the problem, a brightness enhancement film is provided which at least includes: a matrix film comprising at least one birefringent island-in-the-sea yarn having a birefringent interface at a boundary between an island portion and a sea portion; and at least one formed on the matrix film a release film of the side, wherein the release film comprises at least: a first layer comprising at least two or more incompatible polymers; and a second layer formed on the first layer 'by this, applied to The pressure of the release film can be accurately transferred to the surface of the brightness enhancement film'. Therefore, the haze of the brightness enhancement film can be remarkably increased, and the problem of visibility can be improved. In a specific embodiment of the present disclosure, the first layer comprises at least two or more incompatible polymers selected from the group consisting of polypropylene, polyethylene, polyester, polystyrene, and polyamidamine. More specifically, the incompatible polymers can be polypropylene and polyethylene. In this case, the polyethylene content in the first layer may be from 3 to 80% by weight, more preferably from 15 to 2% by weight. When the polyethylene content is outside this range, the desired effect cannot be achieved. 32 201211593 The second broad layer formed on the first layer includes at least 〇 〇栝 〇栝 〇栝 〇 〇 〇 〇 或 或 或 或 i i 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 A sound and an ancient 1 · μ ^ Ηψ 弟 及 and Le 赝 can have a thickness ratio of 1:5 to 1: 10. Embodiments illustrate the examples and experimental methods of the present invention. The following examples and experiments The method is only for diligence and is not intended to limit the scope of the invention. &lt;Example 1&gt; As sea portion (ηχ 57 57, ny=1.57, nz 吐 57, refining temperature = 145. 〇 is an isotropic polycarbonate (PC) alloy, which includes pc and modified poly For the decanoic acid cyclohexyldifluorenyl g diol (PCTG), the ratio is 5 · · 5, and the island is made of anisotropic polyethylene naphthalate (pEN) (n ^ i 88, %=1.57, nz=1.57, pure starting temperature=262 clever. By supplying the island and the sea to the figure as shown in Fig. 3, the spinning spout having the upper distribution plate with 12 island supply units Figure 8 shows a row of outlets under the spinneret plate to prepare birefringent island-in-the-sea yarns with a cross section as shown in Fig. 9 (monofilaments, number of islands = 12192, diameter = 66 μm). The birefringent island-in-the-sea yarn (monofilament) was used as a warp yarn, and the same isotropic PC alloy fiber as the sea portion (melting temperature = 145. 〇 was used as weft woven fabric (60/24). Thereafter, the fabric was placed in two Isotropic pc alloy sheet [. Surface layer / core layer / surface layer of three-layer structure, core layer: PC (melting temperature -149 C ' ι5 〇 μιη) ' Surface layer: pc alloy (melting temperature: 145 〇 c , 3 ^ called ^, with = sea part)], and using vacuum hot pressing (Meiki) under a vacuum of 20 Torr at 150 ° C (lamination temperature) and the pressure is i5kgf / cm2 after 20 minutes 33 201211593 clock To obtain a 400-μιη thick luminance enhancement film. The crack occurrence is shown in the figure. The surface (4), image. The birefringent island yarn used as the warp yarn can be observed: <Example 2> A σ also, The ratio von 5 : 5 ; j is used as the sea (nx=1.57, ny=1.57, n 1 ^ 11 wide 1.57, melting temperature = 145. And anisotropic ΡΕΝ (ηχ=1.88, ny 57 ηζ-1·57, melting The initial 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. 14, the materials are supplied to a spun which has a shape as shown in Fig. 12. A distribution plate above the island supply unit and a lower spinner plate having a discharge port as shown in Fig. 13 to prepare a birefringent island yarn (monofilament) as shown in Fig. 14 The number of islands = 25_, straight (four) 6 5 (four). After the partial yarn to the yarn (ρ() γ, 85 Danny eight monofilament) at a spinning rate of 2500 MPM, the crucible is at 140. (: stretched 2&gt; 1 time to prepare fy (4 〇 Danny / 1 monofilament). The birefringent island-in-the-sea yarn (monofilament, 40 Danny Λ monofilament) thus prepared was used as a warp yarn, and the use was the same as that of the sea portion. The sex PC alloy fiber (melting temperature = M5QC 'POY6 〇 Danny / 24 monofilament) is used as the weft yarn to weave the fabric. Thereafter, the fabric was laminated under vacuum as shown in Example 1 to obtain a luminance enhancement film having a thickness of 400 μm. Fig. 15 is a view showing the image of the surface of the fabric wound in Example 2. We can observe the birefringence island yarn used as warp yarn without yarn breakage 34 201211593 or broken monofilament. · . &lt;Comparative Example ι&gt; An isotropic PC alloy including a PC and a PCTG ratio of 5:5 was used as the sea portion (nx=1.57, ny=i.57, nz=1.57, melting temperature ^^), and anisotropy PEN (nx-1.88, ny = 1.57, nz = 1.57 'melting onset temperature = 262 ° C) was used as the island portion. In order to obtain a birefringent island-in-the-sea yarn having a cross section as shown in Fig. 5, the materials are supplied to a spinning nozzle having an upper distribution plate as shown in Fig. 3 and a lower nozzle plate as shown in Fig. 4. Prepare a birefringent island-in-the-sea yarn with a cross-section as shown in Fig. 5 (monofilament, number of islands = 1〇16, straight = at a spinning rate of 2500 MPM and a spinning temperature of 290. (: Preparation of Ρ〇γ ( After 85 Danny/12 monofilament), 1 &gt; 0 ¥ was stretched 21 times at 140 ° C to prepare ργ (4 〇 Danny / 12 monofilament). Using composite to become a birefringence of 80 Danny / 24 monofilament Two strands of the island yarn FY40/12 were used as warp yarns, and the same isotropic alloy fibers (melting temperature = 145. (:, POY 60/24) as the weft yarns were used to weave the fabric. Thereafter, as in Example 1 The fabric was laminated under vacuum to obtain a brightness enhancement film having a thickness of 400 μm. The figure is shown in the image of the surface of the fabric prepared in Comparative Example 1. We can observe the occurrence of birefringence island yarn entanglement and yarn breakage. Β , C) (, has a high degree of optical modulation and no defects, this application can be widely used in applications requiring optical modulation. = Hui said that it can be widely used in high demand A camera such as an LCD, a carnival, and a light-emitting diode 35201211593 (Light-emitting Diode, LED), Micromirrors and other optical devices, automotive interior and exterior parts, mobile phones and display devices, flat panel displays such as projection displays, plasma display panels (PDPs), field emission displays (FEDs) and electroluminescent displays (ELD) The present invention has been described with respect to the specific embodiments, and the present invention may be variously modified and modified without departing from the spirit and scope of the invention as described in the following claims. BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the invention will be apparent from the description of the appended claims. Schematic diagram of the membrane principle; Figure lb is a cross-sectional view of a conventional birefringent island-in-the-sea yarn; Figure 2 is a cross-sectional view of an injection unit of a spinning nozzle for making an island yarn according to a specific embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION A specific embodiment of the invention discloses a cross-sectional view of a distribution plate on a spinning nozzle for making an island yarn; and FIG. 4 is a conventional spinning nozzle 4 for preparing an island yarn. Figure 5 is a cross-sectional view of a conventional birefringent island-in-the-sea yarn; Figure 6 is a Scanning Electron Microscopic 'SEM 3 image of a fabric comprising at least one conventional birefringent island-in-the-sea yarn. 36 201211593 (X25) ' ' Figure 7 is an SEM image (X40) of at least one fabric of a conventional birefringent island-in-the-sea yarn; Figure 8 is a spinning example of a spinning machine according to a specific embodiment of the present invention. FIG. 9 is a cross-sectional view of a birefringent island-in-the-sea yarn according to a specific embodiment of the present invention; FIG. 10 is an SEM image of a fabric including at least one birefringent island-in-the-sea yarn according to a specific embodiment of the present invention. (X30); FIG. 11 is an SEM image (X100) of a fabric comprising at least one birefringent island-in-the-sea yarn according to a specific embodiment of the present invention; FIG. 12 is a view of a specific embodiment according to the present disclosure for preparing a FIG. 13 is a cross-sectional view of a lower spinner plate for preparing a spun yarn of a sea-island yarn according to a specific embodiment of the present invention; FIG. 14 is a perspective view of the present invention Specific embodiment, A birefringent illustrates a SEM cross-sectional image of the sea yarns; FIG. 15 of the system according to an embodiment of the present invention specifically disclosed, comprising at least a SEM image of a birefringent island fabric yarns. It should be understood that the drawings are not necessarily to scale, and that the representative embodiments of the various preferred features are sufficient to illustrate the basic principles disclosed herein. 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. 37 201211593 In the figures, reference numerals are used to indicate the same or equivalent parts of the various figures in the drawings. [Main component symbol description] 11 Spinning core 12 Island portion 20 Polymer injection unit 30 Upper distribution plate 31 Polymer injection unit 41, 42 and 43 Discharge port 60 Fabric 61 Birefringent island yarn 62 Isotropic fiber 100 Fabric 101 Warp 102 Weft yarn 120 Upper distribution plate 121 Island supply unit 122 Core unit 123 Sea supply unit 124 Island supply passage 131 Flow passage 132 Discharge port 810 Discharge port 38 201211593 820, 821 Flow path A, B, C Yarn break PP polarized light S s polarized light 39

Claims (1)

201211593 201211593 VII. Patent application scope: 1. A brightness enhancement film comprising at least: a substrate; and a birefringent island-in-the-sea yarn 'located at the base (4), having a birefringence interface at the island portion and the ...= boundary, With improved optical modulation, the island and the sea of the birefringent island yarn have different refractive indices, and the direction of the axis &amp; axis [equation ^ Equation 1 A value of or above: A monofilament Number of islands / number of monofilaments of composite filaments. = Declare the special Wei _ 丨 所述 所述 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 The value is = 10,000 or more for the brightness of the application. A value is == the brightness enhancement film described in the third paragraph of the patent scope, 20000 or above. /A value = the brightness enhancement film described in the patent application, wherein (4) the monofilament of the island yarn has a measured or more island portion. 6: The luminance enhancement film of the above item 1, wherein the birefringent island (four) early filament has an island portion of 1 () or more. 7. The brightness enhancement film of item 1, wherein the monofilament of the birefringent island-in-the-sea yarn has an island portion of 2_0 or more. The invention relates to a brightness enhancement film according to the item 1, wherein the birefringent island (four) monofilament has a diameter of 30 μm or more. 9. The brightness enhancement film of claim 1, wherein the birefringence 201211593 island yarn has a single twisted wire diameter of 40-1 ΟΟμπι. 10. The brightness enhancement film of claim 1, wherein the birefringent island yarn comprises at least 15-500 denier per 1-6 monofilament. 11. The brightness enhancement film of claim 1, wherein the birefringent island yarn is a monofilament or a 2-6 strand composite yarn. 12. The brightness enhancement film of claim 1, wherein the birefringent island-in-the-sea yarn is woven into a fabric, one of the weft and warp yarns of the fabric is a birefringent island-in-the-sea yarn, and the other is a fiber, the birefringence The melting initiation temperature of the island island is higher than the melting temperature of the fiber. 13. The brightness enhancement film of claim 12, wherein the island portion of the birefringent island yarn is optically anisotropic, and the sea portion and the fiber are optically isotropic. H. The brightness enhancement film of claim 12, wherein the fiber is selected from the group consisting of polymer fibers, natural fibers, and inorganic fibers. 15. The brightness enhancement film of claim 12, wherein a melting initiation temperature of the island portion of the birefringent island-in-the-sea yarn is higher than a melting temperature of the sea portion and/or the fiber. 16. The brightness enhancement film of claim 12, wherein the island of the birefringent island-in-the-sea yarn has a melting onset temperature 30 ° C or more higher than a melting temperature of the sea portion and/or the fiber. 17. The brightness enhancement film of claim 12, wherein the fiber and/or the sea portion is partially or completely melted. 18. The brightness enhancement film of claim 1, wherein the substrate 201211593 and the birefringent island (four) have a refractive index of two or less, and the matrix and the birefringent island yarn have a refractive index of two. The difference is above 0.1 sst. The glaze enhancement film according to claim 1, wherein the difference between the refractive index of the sea portion and the island portion of the birefringent island yarn in the biaxial direction is 〇.〇5 or less, and the double The difference in refractive index between the sea portion and the island portion of the refracting island yarn in the remaining one-axis direction is 〇1 or more. The brightness enhancement film of claim 1, wherein the refractive index of the sea portion of the birefringent island-in-the-sea yarn is the same as the refractive index of the substrate. 21. The brightness enhancement film of claim 1, wherein a release film is formed on at least one side of the substrate, and the release film comprises at least: a first layer comprising at least two or more a compatible polymer; and a second layer formed on the first layer. 22. The brightness enhancement film of claim 21, wherein the two or more incompatible polymers are selected from the group consisting of polypropylene, polyethylene, polyester, polystyrene, and polyamidamine. group. 42