WO2011122795A2 - Liquid crystal display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device employing a light modulation film, and more particularly, to a liquid crystal display device employing a light modulation film for preventing the breakage of birefringent sea island fibers and improving pilling properties. The thus-manufactured light modulation material is not prone to the entanglement of birefringent sea island fibers (monofilament) and to the formation of fiber stripes, and therefore has improved visibility. Also, when birefringent sea island fibers are not subjected to a separate fiber-combining process or are combined, only a few thick fiber strands may be combined to prevent a portion of the fibers from being broken and the occurrence of pilling.

Description

 【Specification】

 [Name of invention]

 LCD Display

 [Technical Field]

 <1> The present invention relates to a liquid crystal display device comprising an optical modulation film, and more particularly to a liquid crystal display device comprising an optical modulation film that improves the phenomenon of cows by preventing the birefringent islands thread trimming.

 [Background technology]

 <2> Flat panel display technology has already gained a good reputation in TV

 Liquid crystal displays (LCDs), projection displays, and plasma displays (PDPs) are mainstream, and field emission displays (FEDs) and electroluminescent displays (ELDs), etc., share related fields with each characteristic along with improvements in related technologies. It is expected to do. LC displays are currently expanding their range of use, including notebooks, personal computer monitors, LCD TVs, automobiles, and airplanes, accounting for about 80% of the flat panel market.

 The conventional LC display arranges liquid crystal and electrode matrix between a pair of light absorbing optical films. In an LC display, the liquid crystal portion has an optical state that is changed accordingly by moving the liquid crystal portion by an electric field generated by applying a voltage to two electrodes. This process displays the image of the "pixel" containing information using polarization in a specific direction. For this reason, LC displays include front and back optical films that induce polarization.

The liquid crystal display of such an LC display does not necessarily have a high utilization efficiency of light emitted from the backlight. This is because more than 50% of the light emitted from the backlight is absorbed by the rear optical film. Therefore, in order to increase the utilization efficiency of the backlight light in the liquid crystal display device, the light between the optical cavity and the liquid crystal assembly is increased. Install the modulation film _''

Fig. 5 is a diagram showing the optical principle of a light modulation film mounted on a conventional liquid crystal display device. Specifically, P-polarized light from the optical cavity to the liquid crystal assembly passes through the optical modulation film to be transmitted to the liquid crystal assembly, and S-polarized light is reflected from the optical modulation film to the optical cavity, and then the light is reflected on the diffuse reflection surface of the optical cavity. The polarization direction is reflected in a randomized state and is transmitted back to the optical modulation film. In the end, S-polarized light is converted into P-polarized light that can pass through the polarizer of the liquid crystal assembly, and then passes through the optical modulation film. To be delivered to the assembly.

 The selective reflection of the S-polarized light and the transmission of the P-polarized light to the incident light of the optical modulation film are performed in a state where the optical layers on the plate having anisotropic refractive index and the optical layers on the plate having an isotropic refractive index are alternately stacked. It is made by setting the optical thickness of each optical layer and the refractive index change of the optical layer according to the difference in refractive index and the elongation of the stacked optical layers.

 That is, the light incident on the optical modulation film repeats the reflection of S-polarized light and the transmission of P-polarized light through each optical layer, and eventually only the P-polarized light of the incident polarization is transmitted to the liquid crystal assembly. On the other hand, the reflected S-polarized light is reflected in a state in which the polarization state is randomized at the diffuse reflection surface of the optical cavity and is transmitted to the light modulation film again. As a result, it is possible to reduce power waste with loss of light generated from the light source.

 However, such a conventional optical modulation film has an optical thickness between each optical layer that can be optimally optimized for selective reflection and transmission of incident polarization by extending the stack of isotropic optical layers and anisotropic optical layers having different refractive indices. Because it is manufactured to have a refractive index, there is a problem that the manufacturing process of the optical modulation film is complicated. In particular, since each optical layer of the optical modulation film has a flat plate structure, it is necessary to separate P-polarized light and S-polarized light in response to a wide range of incident angles of incident polarization, so that the number of optical layers is excessively increased and the production cost is exponential. In addition, due to the structure in which the number of laminated layers of the optical layer is excessively formed, there is a problem that the optical performance is deteriorated due to light loss.

Accordingly, it has been found that the liquid crystal display device having the optical modulation film including the birefringent island-in-the-sea yarn inside the substrate is advantageous in overcoming the above-mentioned problems. In particular, the birefringent island-in-the-sea yarn was found to have significantly improved the effects of light modulation efficiency and luminance improvement than the conventional birefringent fibers. Among the parts constituting the island-in-the-sea yarn, the island portion has anisotropy, and the solution portion partitioning the island portion has isotropy. In this case, not only the hard interface between the island-in-the-sea yarn and the base material, but also the hard interface of the seams and the sea part of the sea yarn has a birefringent interface, so a birefringent interface occurs only at the hard interface between the base material and the birefringent fibers. Compared with the conventional birefringent fibers, the optical modulation effect is significantly increased, and thus, the laminated type optical modulation film can be substituted for actual industrial use. Therefore, the birefringent island-in-the-sea yarn is used as compared to the conventional birefringent fibers. In this case, the efficiency of brightness enhancement is excellent, and optical properties of the island portion and sea portion inside the birefringent islands In this case, the birefringence interface can be formed inside the island-in-the-sea yarn, and the luminance enhancement efficiency can be remarkably improved in comparison with the case where it is not.

Meanwhile, in order to maximize the light modulation efficiency, the area of the birefringent interface is advantageously wide in the birefringent islands, and for this purpose, the number of islands in the birefringent islands should be large. However, the conventional islands and islands are arranged concentrically around a single spinning core inside the islands, and the structure of such a cross section is fine when the number of the islands is small, but when the number of the islands increases (about 300 or more), in the case of the island portion adjacent to the spinning core formed at the center of the island, the density becomes large, and the phenomenon of agglomeration (conjugation phenomenon) occurs in the portion of the coating located around the spinning core during the spinning process. . More specifically, FIG. Lb is a cross section of the conventional islands of the islands (FIG. 331), wherein the islands 12 are arranged concentrically around a single spinning core 11 within the islands. The cross section occupies 30 to 70%. This cross-sectional structure is not abnormal when the number of islands is small, but when the number of islands increases (about 300 or more) or when the ratio of the cross-sectional area of the islands in the island area becomes high, the radiation is formed at the center of the islands. In the case of the proximal portion adjacent to the core 11, the density becomes large, and a phenomenon of agglomeration between the proximal portions positioned around the radiating core occurs in the spinning process. In other words, the greater the number of islands in the island, the greater the number of islands in the central portion of the islands will form agglomerates (degrees of bonding),

 <ιι> Therefore, birefringent islands with a cross-sectional shape of the conventional islands of seaweed have a problem that the birefringence interface is reduced due to the degree of coupling as the number of islands increases, so that the optical modulation efficiency is not greatly improved.

 <12> Furthermore, the number of birefringent islands and islands arranged in the conventional optical modulation film

Since only 36 ~ 300 pieces, the birefringent islands mono yarn with 10 ~ 30 diameter and 100 ~ 300 diameter is used in the form of twisted 7 ~ 144 strands in order to increase the light modulation efficiency. 40de / 12fila to 500de / 144f i la). As a result, the birefringence interface was increased, but the optical modulation efficiency was improved, but entanglement occurred between the monofilamented monofibers. In addition, when several tens of mono yarns are drawn together and stretched, some of the fibers are broken (broken), resulting in the occurrence of hair growth. As a result, the direction of the fibers is changed in the area where the yarns are broken. Not only decreases the light modulation efficiency but also drawbacks when the light modulation film is used in the liquid crystal display. It's fun to work with. In addition, when the wool occurs, the problem that the weaving is poor due to the impediment of the weft due to the poor opening movement (when manufacturing the fabric) during the weaving of the birefringent sea island yarns caused a problem of lowering the weaving workability.

 [Invention and detailed explanation]

 [Technical Challenges]

 The present invention has been made to solve the above-described problems, the first problem to be solved by the present invention is to prevent the entanglement between birefringent islands and islands to prevent the occurrence of a fiber band liquid crystal display comprising a light modulation film To provide a device.

 A second object of the present invention is to provide a liquid crystal display device including a light modulating film that prevents birefringent island-in-the-sea yarn trimming so that no phenomenon occurs.

 [Technical Solution]

 The present invention, in order to achieve the first object, the backlight for irradiating light;

 An optical modulation film positioned on an upper end of the backlight and modulating the light irradiated from the backlight, including an island-in-the-sea yarn having birefringence in a substrate; And a liquid crystal display panel for realizing a predetermined image through the light modulated by the light modulating film, wherein the birefringent island-in-the-sea yarn comprises a liquid crystal display device having a diameter of at least 30 mono monoliths and at least 1000 island components. to provide.

 According to a preferred embodiment of the present invention, more preferably, the diameter of the mono yarn may be 40 ~ ΙΟΟΐΜ.

According to another preferred embodiment of the present invention, the birefringent islands are 15 to 15

 It can be 500 denier / 1 to 6 strands.

According to another preferred embodiment of the present invention, the birefringent islands

 A value of the following relation 1 may be 500 or more.

 According to another preferred embodiment of the present invention, the A value may be 1000 or more, preferably 5000 or more, more preferably 10000 or more, and more preferably 20000 or more.

 <21> [Relationship 1]

 <22> A = number of islands of mono yarn I Number of mono yarns forming one plywood

According to another preferred embodiment of the present invention, the number of birefringent island-in-the-sea yarn may be 1000 or more, preferably 5000 or more, and more preferably 10000 or more. And most preferably may be more than 20000, According to another preferred embodiment of the present invention, the number of birefringent island-in-the-sea yarns may be 10000 or more.

 According to another preferred embodiment of the present invention, the number of birefringent island-in-the-sea yarns may be 20000 or more. According to another preferred embodiment of the present invention, the birefringent island-in-the-sea yarn may be a mono yarn or two to five strands.

 According to another preferred embodiment of the present invention, the birefringent island-in-the-sea yarn is woven in the form of a fabric, one of the weft or warp of the fabric is a birefringent seaweed yarn and the other is a fiber, the birefringent island-in-the-sea yarn The initiation temperature of the coating may be higher than the melting temperature of the fibers.

 According to another preferred embodiment of the present invention, a birefringent interface may be formed at the boundary between the island portion and the sea portion of the birefringent islands.

 According to a preferred embodiment of the present invention, the fiber may be isotropic fiber of optical properties.

 According to another preferred embodiment of the present invention, the fibers may be any one or more fibers selected from the group consisting of polymer fibers, natural fibers and inorganic fibers.

According to another preferred embodiment of the present invention, the melting start temperature of the island portion of the birefringent islands may be higher than the melting temperature of the sea portion, more preferably the melting start temperature of the island portion of the birefringent islands It may be 30 ^° C above the melting temperature of the powder,

 According to another preferred embodiment of the present invention, the melting initiation temperature of the island portion of the birefringent island-in-the-sea yarn may be 3 (rc or more) higher than the melting temperature of the fiber.

 According to another preferred embodiment of the present invention, the melting start temperature of the island portion of the birefringent islands may be higher than the sea portion and the melting temperature, more preferably the melt start temperature of the island portion of the birefringent islands 3 (rc may be higher than the melting temperature of

According to another preferred embodiment of the present invention, the island portion of the birefringent islands and the melting start temperature may be 30 ^° C or more higher than the melting temperature of the fiber.

According to another preferred embodiment of the present invention, part or all of the sea portion of the birefringent island-in-the-sea yarn may be molten. According to another preferred embodiment of the present invention, the sea portion of the fiber and the birefringent seaweed yarn may be the same component.

According to another preferred embodiment of the present invention, the optical properties of the island portion may be birefringent, and the optical properties of the sea portion may be isotropic.

According to another preferred embodiment of the present invention, the refractive index of the base material and the birefringent seaweed yarn has a difference in refractive index of 0.05 or less in two axial directions, and a difference in refractive index of the other one axial direction. May be equal to or greater than 1, and preferably, the refractive index of the substrate in the X-axis direction is nXl, the refractive index in the y-axis direction is nYl, and the refractive index in the ζ-axis direction is nZl, and the refractive indices of the birefringent island-in-the-sea yarns are nX2 ᅳ nY2 and ηΖ2 In this case, at least one of the lobster and the birefringent seaweed yarn X, Υ, Ζ axial refractive index may coincide, more preferably ηΧ2> ηΥ2 = ηΖ2.

According to another preferred embodiment of the present invention, the refractive index of the sea portion and the island portion of the birefringent island-in-the-sea yarn is 0? 05 or less in two axial directions, and for the other one axial direction. The difference in refractive index may be greater than or equal to 0.1. Preferably, the refractive index in the X-axis direction in the longitudinal direction of the island portion of the birefringent island-in-the-sea yarn is nX3, the refractive index in the y-axis direction is nY3, and the refractive index in the ζ-axis direction is η23, anatomy When the refractive index in the χ-axis direction is nX4, the refractive index in the y-axis direction is nY4, and the ζ-axis direction and the refractive index are ηΖ4, at least one of the X, 재, and Ζ-axis refractive indices of the substrate and the birefringent islands More preferably, the absolute value of the difference between the refractive indices of η 3 and η 4 may be greater than or equal to 0′1.

 According to another preferred embodiment of the present invention, 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 substrate.

 According to another preferred embodiment of the present invention, the fabric may be woven into a non-symmetrical structure so that the birefringent seaweed is exposed to the surface more than the fiber.

The terminology used herein is briefly described.

<44>, the fibers have a birefringent "means is that the one direction light incident on the polymer if the refractive index is irradiated with light to other fibers in accordance with the direction of refraction in the other two light _'

 'Isotropic' means that the refraction is constant regardless of the direction in which light passes through the object.

<46>'Anisotropy' means that the optical properties of an object vary depending on the direction of light. This anisotropic object has birefringence and corresponds to isotropy. Light modulation means that the irradiated light reflects, refracts, scatters, or changes in the intensity of the light, the frequency of the wave, or the nature of the light.

 <48> 'Monosa' refers to the form of fibers used by winding single strands of thread rather than twisting several strands of thread into a single thread. Refers to a strand of fiber.

"49" means the shape of the fiber in which more than one strand of mono yarn bends and uses several strands of thread simultaneously through twisting, entanglement, etc., acting as if it is a strand of thread. It is not included in the plywood of the present invention that the fibers passing through the different capillary or island component supply sections of the upper distribution plate are not included in the yarn of the present invention. Forming a birefringent island-in-the-sea yarn before spinning after passing through is itself mono mono _'

 <50> 'Moor phenomenon' refers to a defect that occurs when some of the fibers of the male strands that make up the plywood are cut off.

 <51> The term 'spinning core' means that when cutting the islands in the longitudinal direction, the islands are grouped at a certain point inside the islands (the center of the yarn). If arranged, it means a certain point.

<52>'Radiation reference core' means a radiation core which is a center when a plurality of radiation cores exist and the other radiation cores are arranged around one radiation core, and the 'radiation peripheral core' is one radiation core. refers to the remaining radiation core is arranged around the core _\.

<53> 'The island parts are grouped and arranged' means that the island parts of the islands are divided and arranged in a uniform shape around a single radiation core. In the case of two cores, the islands in the island are divided into two groups because the islands are arranged in a uniform shape around each spinning core.

 <54> 'Melting start temperature' refers to the temperature at which the melting of a polymer begins, and 'melting temperature' refers to the temperature at which melting occurs most rapidly. If the end point of the endothermic peak due to melting is the start of melting, the temperature corresponding to the vertex of the endothermic peak becomes the melting temperature.

 Advantageous Effects

<55> A liquid crystal display device employing an optical modulation film including a birefringent island-in-the-sea yarn that satisfies the conditions of the present invention does not generate entanglement between birefringent island-in-the-sea yarns (monosa). Because of this, visibility is improved. In addition, even when the bi-refractive seaweed yarn is used or woven in the form of mono yarn without a separate weaving process, only a few strands of coarse fibers are spliced. Can be blocked. As a result, since the reverse polarization effect does not occur, the light modulation efficiency can be maintained and the appearance characteristics of the light modulation film can be remarkably improved since no defect occurs in the light modulation film. In addition, weaving process can be improved because weaving process does not occur by weaving weft due to poor opening movement during weaving process.

 [Brief Description of Drawings]

 La is a schematic view illustrating the principle of a conventional optical modulation film.

 Lb is a cross-sectional photograph of a conventional birefringent island-in-the-sea yarn.

 Figure 2 is a cross-sectional view of the injection portion of the spinneret for manufacturing sea islands according to an embodiment of the present invention.

 3 is a cross-sectional view of the upper distribution plate of the spinneret for producing sea island yarn according to an embodiment of the present invention.

FIG. 4 is a bottom plate and a cross-sectional view of a conventional spinneret for producing sea island yarn.

 5 is a cross-sectional photograph of a conventional birefringent island-in-the-sea yarn.

 6 is a SEM (25 times) photograph of a fabric including a conventional birefringent island-in-the-sea yarn.

7 is a SEM (40 times) photograph of a fabric including a conventional birefringent island-in-the-sea yarn.

8 is a cross-sectional view of the lower holding plate of the spinneret for producing sea island yarn according to an embodiment of the present invention.

 9 is a cross-sectional photograph of a birefringent island-in-the-sea yarn according to a preferred embodiment of the present invention.

 10 is a SEM (30 times) photograph of a fabric including a birefringent island-in-the-sea yarn according to a preferred embodiment of the present invention.

11 is a SEM (30 times) photograph of a fabric including a birefringent island-in-the-sea yarn according to a preferred embodiment of the present invention.

<68> Figure 12 is a cross-sectional view of a portion of the gold sphere preferred embodiment may be according to the example used for making a spinneret of the present invention back _plate,

 FIG. 13 is a cross-sectional view of the lower plate of the spinneret for manufacturing island-in-the-sea yarn according to the preferred embodiment of the present invention.

FIG. 14 is a cross-sectional SEM of a birefringent island-in-the-sea yarn according to an embodiment of the present invention. It is a photograph.

 FIG. 15 is a SEM photograph of a fabric including a birefringent island-in-the-sea yarn according to a preferred embodiment of the present invention.

 FIG. 16 is an exploded perspective view of a liquid crystal display device including the optical modulation film of the present invention. FIG.

 [Best Mode for Implementation of the Invention]

 Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

 As described above, when the number of birefringent islands in the optical modulation film included in the conventional LCD is 100 to 300, the degree of joint bonding phenomenon (Fig. Lb) occurs. In addition, the number of island parts is small, so that the efficiency of light modulation is increased, so that it can be used for commercial purposes. 7 ~ 144 birefringent sea islands (monosa) having a diameter of 10 to 30 / 皿 and 36 to 300 degree parts Was used in combination. As a result, the optical modulation efficiency was improved by increasing the birefringent interface, but dozens of fibers were intertwined, causing entanglement (twist) between mono yarns. In addition, when several tens of hundreds of mono yarns are spliced together and stretched, some strands of the fibers are broken (broken), resulting in the appearance of the cattle phenomenon. As a result, the direction of the fiber is changed in the part where the trimming occurs, so that the reverse polarization effect appears and not only decreases the light modulation efficiency but also acts as a defect when the light modulation film is used in the display sheet. In the case of birefringent seaweed weaving (when manufacturing fabrics), weaved fiber was cut during the passing of the weaving machine and the radial heald, resulting in a problem of reducing the weaving workability.

The present inventors have disclosed the spinneret for manufacturing sea island yarn of Korean Patent Application No. 2009-12138. Specifically, FIG. 2 is a cross-sectional view of the spinneret and includes a polymer injecting part 20 capable of injecting the island component and the sea component polymer. FIG. 3 shows the captive partial plate 30 included in the spinneret. In this case, a plurality of polymer injection portions 31 are formed to emit a plurality of birefringent island-in-the-sea yarns. Each of the polymer injection portions 31 formed in the depressed partial plate 30 has a discharge hole 41 corresponding to this. 42, 43) are formed (to match the number of the polymer injection holes and the number of discharge holes) to manufacture a lower billet plate (FIG. 4) through which the birefringent islands having a number of islands 1016 in the birefringent islands A yarn (monosa yarn, FIG. 5) was prepared. That is, as shown in FIG. 2, one group island-in-the-sea yarn (FIG. 5) is manufactured in one polymer injection unit, and a plurality of group islands-in-the-sea islands are manufactured when the polymer injection unit is formed in plural as shown in FIG. 3. In other words, the detentional partial plate of FIG. 3 may have 2 to 20 polymer injection units arranged in series or in parallel. For example, if 12 polymer injection portions are gathered to form a delimiting partial plate (FIG. 3), each of the polymer injection portions having 12 individual discharge ports 41, 42, 43 corresponding to each of the polymer injection portions formed on the deformed partial plate is formed. It is to produce a lower spinneret plate (FIG. 4) and combine it to produce a whole spinneret. Through this, it is possible to radiate 12 strands of the birefringent islands of FIG. 5 (the number of the monoliths of the mono yarns, the diameter of the mono yarns 19), and finally to emit 12 strands of the mono yarns through a single spinneret. .

 However, even in the case of the birefringent island-in-the-sea yarn (monosa yarn) of FIG. 5, the mono yarn (diameter: 19) itself has low light modulation efficiency, so it is actually 40 de (denier) / 12 fila (strand), 80/24 (de / fila) and then weaved into a weft or inclined fabric to be disposed inside the light modulation film. Specifically, FIGS. 6 and 7 illustrate the birefringent sea island yarn (monosa) of FIG. A woven fabric 60 woven by weaving and weaving or warping it, the woven fabric 60 is a birefringent seaweed yarn 61 (monosa) as a warp yarn 80/24 (de / fila) and isotropic as a weft yarn Weaving the fabric by weaving the fibers 62. As a result, the light modulation efficiency is improved, but the monosawa diameter is small and the number of strands to be spliced is increased, so that the trimming (A, B, C in Fig. 6) appears in some mono yarns. Eventually, the phenomenon of occurrence occurs and eventually the light modulation film and the liquid crystal including the same The display has been shown to be defective.

 Thus, in the present invention, the present invention, a backlight for irradiating light in order to achieve the first object; An optical modulation film positioned on an upper end of the backlight and modulating the light irradiated from the backlight, including an island-in-the-sea yarn having birefringence in a substrate; And a liquid crystal display panel including a liquid crystal display panel for realizing a predetermined image through light modulated by the light modulating film, wherein the birefringent island-in-the-sea monofilament has a diameter greater than or equal to 1000 or more. By solving the above-described problems ᅳ through this does not occur entanglement and trimming between the mono yarns included in the light modulating film does not cause the phenomenon. As a result, not only defects appear on the LCD, but also reverse polarization does not appear, so that the luminance can be maintained uniformly.

 According to one feature of the present invention, the condition of the birefringent islands included in the light modulating film has a diameter of 30 micrometers and the number of monocomponents of mono yarns should be satisfied at the same time.

If the diameter of the mono yarn is less than 30 (particularly as follows conventionally), there may be a problem of entanglement between the mono fibers and some fibers are trimmed in the synthetic yarn and stretching process (see Examples and Comparative Examples). Preferably, the mono yarn diameter of the birefringent island-in-the-sea yarn may be 40 to 100 ^ ni. Meanwhile, the number of island components is about 300 as in the prior art. If the diameter of the mono yarn is more than 30 / while maintaining the trimming, trimming may be prevented, but the light modulation effect is remarkably lowered due to the lack of the number of island components. In order to maintain the conventional light modulation effect, the brightness can be improved. In this case, only the thickness of the mono yarns is thicker than the conventional ones, and thus, there may be a problem in that the appearance of the fiber is very poor due to the occurrence of fiber ratio sedimentation on the outside. At the same time, it should be satisfied to prevent the trimming and at the same time to prevent the decrease of luminance and the sedimentation of the fiber.

 Also according to one aspect of the present invention, the braided island-in-the-sea yarn may be 15 to 500 denier / 1 to 6 strands, more preferably 20 to 60 denier / 1 to 4 strands, if birefringence If the sea island is less than 20 denier, the residence time of the polymer raw material is longer, which may cause thermal decomposition, and the strength is low, which may lower the radioactivity. If it exceeds 60 denier, the solidification is poor after spinning. It may worsen and cause radioactive deterioration. In addition, if the number of strands to be spliced exceeds 7, trimming may occur in the spinning or stretching process.

 As described above, FIGS. 2 and 3 illustrate an injection part of a spinneret for manufacturing sea island yarn disclosed in Korean Patent Application No. 2009-12138 and an upper holding plate including a plurality of the injection parts. In combination with the lower plate, the number of islands of FIG. 5 emits 1016 birefringent islands. Meanwhile, Korean Patent Application No. 2009-12138 is incorporated by reference of the present invention.

 However, the birefringent island-in-the-sea yarns do not use the lower portion plate of FIG. 3 but use the lower portion plate to form only one discharge hole as shown in FIG. In the case of spinning the birefringent islands (monosa) having a diameter of 12192 pieces and a diameter as shown in Figure 9 can be manufactured, and the related spinnerets for manufacturing sea island yarns related to this, Korean Patent Application No. 2010-0028219 Is inserted into the reference to the present invention, but is not limited to this, if it is in accordance with the object of the present invention can be prepared sea island yarn through various forms of spinneret.

 Specifically, FIG. 8 is a cross-sectional view of the lower plate of the spinneret for producing island-in-the-sea yarn production according to an aspect of the present invention. The flow paths 820 and 821 are polymers introduced through respective polymer injection portions formed in the upper portion of the cage. It is formed to flow toward the discharge port 810 of the can be designed in various numbers and shapes depending on the arrangement of spinneret.

The discharge port 810 finally discharges the polymers collected through the flow paths 820 and 821. The number of ejection openings 820 and 821 may be smaller than the number of polymer injecting portions, and most preferably, one ejection opening 810 may be formed. It is possible to manufacture sea island yarn (mono yarn) having 12192 pieces and a diameter of 40 to 100 m. The island-in-the-sea yarn of FIG. 9 has a space in which the island portion is not dense at the central portion thereof, so that no seam is generated.

 On the other hand, the spinneret of the present invention, like the spinnerets for manufacturing sea islands in general, the diameter of the lower holding plate, which is the portion where the actual islands are discharged, becomes narrower than that of the upper part of the spinneret. Can have a shape

The shape of the cross section of the portion of the crest of the upper plate of the present invention may be circular, but it is possible to design by deforming to various shapes of the portion of the crest of the plate according to the shape of the desired island, the shape of the cross section The diameter of the cross section of the gold platelet may vary depending on the diameter of the desired island-in-the-sea yarn, but may preferably be 70 to 250 mm 3. In addition, the thickness of the upper plate portion may be 10 to 30 countries, but is not limited thereto. The diameter of the lower plate may be the same as or smaller than that of the upper portion plate, and the discharge port and the diameter may be 2 to 1.0 醒. The length of the flow path may be 40 ~ 120 있고, the width of the flow path may be 4 ~ 10 I 腿 but is not limited to this can be variously designed according to the specifications of the island.

 10 and 11 are optical micrographs of the woven fabric 100 woven from the birefringent island-in-the-sea yarn of FIG. 8, using it as the warp 101 as the mono yarn itself and using the isotropic fibers as the weft yarn 102. It can be seen that the birefringent islands that satisfy the diameter range of the mono yarns of the present invention, unlike the birefringent islands that do not satisfy this, the appearance of the trimming and mourning of the mono yarns.

Meanwhile, the above-described birefringent island-in-the-sea yarn (monosa yarn) of FIG. 9 is merely an example, and in reality, the number and diameter of the discharge ports included in the upper plate and the lower plate having various configurations and the number of drawing portions are described. By combining them properly, birefringent islands of various sizes and thicknesses can be produced. In other words, in the case of manufacturing a single discharge port from a spinneret having 1200 pieces of mono yarns and 8 individual discharge holes, a birefringent sea yarn (monosa yarn) having 9600 islands may be produced.

Meanwhile, when the birefringent islands are radiated using the upper portion distribution plate of FIG. 3 and the lower plate of FIG. 8, the islands of the islands having the number of islands of 20000 or more are centered as shown in FIG. 3. In the case of arranging the pins in a concentric shape, the density of the pins may be difficult to manufacture. Accordingly, according to an aspect of the present invention shown in Figures 12 and 13 As described above to solve the above problems by manufacturing a spinneret for manufacturing sea island yarn, Korea Patent Application No. 2010-0027670 related to this is inserted as a reference of the present invention, which corresponds to an example and in accordance with the object of the present invention Various types of spinnerets can be designed and used.

Specifically, FIG. 12 is a cross-sectional view of the spherical part plate 120 of the spinneret for producing island-in-the-sea yarn manufacturing according to an aspect of the present invention, which is formed at the center and prevents the joining of the core part 121 and the core part ( 121 is formed radially around the plurality of island component supply paths 122 are formed along the outer periphery of the plurality of island component supply units 123 and 124 and the island component supply units 123 and 124 formed therein. And a plurality of sea component supply units 125 including a sea component supply passage. The island component supply unit 122 includes a plurality of island component supply passages 124. Since approximately 800 to 1400 island component supply paths 124 may be formed in one island component supply unit 121, 1252 island component supply paths 124 may be formed in one island component supply unit 121. When the number of the island component supply unit 121 is 20, the number of the island portions of the radiated birefringent island-in-the-sea yarn is approximately 25,000.

 Further, the detentional partial distribution plate of the spinneret for producing a pizza type island-in-the-sea yarn surrounds a single island component supply unit 121 with a sea component supply unit 123, and supplies a island component to the core portion 122 of the spinneret. It may not form wealth. As a result, the sea component of the birefringent island-in-the-sea yarn can penetrate well into the inside of the island component, and the center portion, which is a portion where the island component is concentrated in the spinnerets for manufacturing the island-in-the-sea yarn, is empty, so that the joint formation phenomenon occurs when the number of island components is large. It will not appear.

 On the other hand, the number of sea component supply paths included in one sea component supply unit is not limited as long as the sea island yarn can be manufactured and the degree of prevention of the seam can be prevented. Preferably, the number of sea component supply passages included in one sea component supply unit may be 3 to 25, and the total number of sea component supply passages may be 60 to 2500 units. In addition, the number of sea component supply paths formed in the sea component supply unit 126 continuously formed along the outer circumference of the core portion 121 may be 20 to 500.

 Meanwhile, the diameters of the island component supply passage and the sea component supply passage used in the present invention may be variously designed depending on the composition of the island-in-the-sea yarn manufactured. Preferably, the diameter of the island component supply passage is 0.1 to 0.3 mm 3. For example, the diameter of the sea component supply path may be 0.2 to 2。0 匪, but is not limited thereto.

In addition, the shape of the cross-section of the detentional partial plate of the present invention may be circular, but the desired It is possible to design by deforming to various shapes of the upper portion of the plate according to the islands and seams, and if the cross-sectional shape is circular, the diameter of the cross section of the portion of the cage portion may vary depending on the diameter of the desired sea island, but preferably It may be 70 to 250 microns. In addition, the thickness of the detentional partial plate may be 10 ~ 30 ~, but is not limited thereto. FIG. 13 may be used in combination with the detention plate partial plate of FIG. 12 as a lower holding plate according to an aspect of the present invention. Specifically, the polymer supplied from the island component supply unit 121 and the sea component supply unit 123 may be used. Can be radiated after being collected at the discharge port 132 along the flow path 131. The diameter of the discharge port of the lower stopper plate can be 0'2 ~ ： L0 匪, the length of the flow path can be 40 ~ 120 醒, and the width of the flow path can be 3 ~ 10 腿 ᅳ The width of the lower stopper plate can be It may be less than or equal to the width of the gold plate, and the length may be 3 to 30 隱, but is not limited thereto.

 Furthermore, in order to facilitate the distribution and mixing of island and sea components in addition to the detentional partial distribution plate of the present invention, a separate distribution plate is provided with appropriate numbers on the upper and / or lower portions of the detentional partial distribution plate to form spinnerets. It is also possible to form

 FIG. 14 shows the birefringent sea island yarn (fiber component number: 25040, diameter: 66.5 / ΛΠ) manufactured through the spinneret including the upper partial plate of FIG. 12 and the lower plate of FIG. Even when the number of island components exceeds 20000 as a mono yarn, no conjugation phenomenon occurs.

 FIG. 15 is a view showing that the occurrence of hair loss and trimming does not occur in the birefringent seaweed yarn used as the warp fabric which is woven with the birefringent seaweed yarn (monosa yarn) of FIG. 14 described above as the warp yarn and the isotropic fiber as the weft yarn. I can confirm it.

 On the other hand, the above-described birefringent islands for manufacturing spinneret is characterized in the upper portion of the detention plate and the lower portion of the detention, respectively, and the configuration and the other combinations of these can be applied to the configuration of the spinneret for manufacturing the island Furthermore, the above-described birefringent island-in-the-sea yarn production yarns and a method of manufacturing the birefringent island-in-the-sea yarn using the same are examples for satisfying the relational formula 1 of the present invention and actually satisfy the relational formula 1 of the present invention by various methods. It will be possible to manufacture the yarn.

According to an aspect of the present invention, the birefringent island-in-the-sea yarn may have an A value of 500 or more in relation to '1 _'

<ιοο> [Relationship 1]

 <ιοι> A = number and degree of mono yarns I Mono yarns and numbers forming one plywood

In other words, when the number of birefringent islands in the conventional birefringent islands is 300, 50 strands In the case of using 1016, or in the case of the number of islands is 1016, 12 strands are used together, and when the values are substituted in Equation 1, the A values are 6, 84.7, which is far less than 500. In addition, when the number of islands is 127, 48 strands are used together, or when the number of islands is 297, 8 strands are used together. Substituting this into the above equation 1 results in 2.6 and 37.1, respectively. Much less than 500.

On the other hand, as described above, when 12192 degrees (1 strand), 6096 degrees (2 strands), 25040 degrees (1 strand), 5008 degrees (5 strands) are used as birefringent seams, respectively, the A value is 12192. , 3048, 25040, and 1001.6, well beyond 500. At this time, the use of a mono yarn rather than a plurality of strands is significantly reduced the possibility of occurrence of hair phenomena due to fiber entanglement and fiber cutting, more preferably A value of 1000 or more, 10,000 or more Alternatively, it is advantageous to use birefringent island-in-the-sea yarns of 20000 or more, and most preferably, the use of mono- or two strands of birefringent island-in-the-sea yarns of 10000 or 20000 or more bi-refringent island-in-the-sea yarns is preferred. It is most effective in preventing a phenomenon

 Further, if the birefringent islands are not fused mono mono yarns having the same number of island components, but mono yarns having a different number of island components (for example, 297 mono For eight yarns and 48 mono yarns with 127 sections), the average value can be defined as the number of mono yarn sections.

 After all, when the birefringent island-in-the-sea yarn satisfies the above-described thickness condition of the mono yarn and the number of island components and / or the above relation 1, the liquid crystal display including the same may be used between the birefringent island-in-the-sea yarn (monosa). Since no entanglement occurs, no fiber band is formed, thereby improving visibility. In addition, even when the birefringent island-in-the-sea yarns do not undergo a separate weaving process, even if they are used in the form of mono yarn or they are spliced together, only a few strands of coarse fiber are spliced, so that some fibers are not trimmed in the stretching process. can do. As a result, the reverse polarization effect does not occur, so that the optical modulation efficiency can be maintained and the defects in the liquid crystal display do not occur. Therefore, the visibility of the liquid crystal display can be remarkably improved. In addition, it is possible to improve the weaving operation because the phenomenon of the thread being trimmed does not occur during the passing of the weaving machine and the Radius Heald.

According to another aspect of the present invention, when the birefringent islands are themselves included in the optical modulation film, the birefringent islands are easily moved in the lamination process (because they become large), so this is appropriate. Difficult to deploy Thus, the birefringence When weaving a fabric containing a composite island-in-the-sea yarn and laminating it between the substrates and laminating it, the birefringent island-in-the-sea yarn is fixed so that it can be properly disposed. When inserted into the form of the fabric rather than itself, it is included in the light modulating film. When the fiber constituting the fabric is used as a transparent material, even when irradiated with light from outside (the light from the light source of the liquid crystal display In the case of passing through the light modulating film, the inside of the fabric (fiber) was seen to the outside, which was a major obstacle to commercialization.

 In the present invention, the birefringent island-in-the-sea yarn is woven into the fabric, one of the weft or warp of the fabric is a birefringent island-in-the-sea yarn and the other is a fiber, the melting start temperature of the island portion of the birefringent island-in-the-sea yarn The above problem has been solved by providing a light modulating film higher than the melting temperature of the fiber.

 First, the fabric included in the light modulating film of the present invention will be described with reference to FIG. 10 is a photograph of a fabric that may be used in the present invention, first, the fabric 100 may be made of weft 102 and warp 101, either of which weft 102 or warp 101 Is a birefringent island-in-the-sea yarn and the other is a fiber. In other words, when the birefringent island-in-the-sea yarn is used as the weft yarn 102, the fiber becomes the warp 101 and the birefringent seaweed yarn is used as the warp 101. The fiber then becomes weft 102. The wefts and warps that make up the fabric may be transparent or translucent to allow light to pass through, depending on the purpose.

On the other hand, the melt onset temperature of the island portion of the birefringent island-in-the-sea yarn is higher than the melt temperature of the fiber. This allows the fabric to be placed between substrates and subjected to a lamination process by applying heat and / or pressure. If the lamination process is carried out at a temperature between the melting temperature and the melting start temperature of the coating portion, the coating portion is not melted because the melting initiation temperature has not been reached, but the lamination process is performed at a temperature higher than the melting temperature of the fiber. Is partially or fully melted. The result is that the weft or warp weaved fibers are melted in the lamination process and become part of the substrate, leaving only the birefringent islands in the interior of the final optical modulation film. It is possible to bond fabrics and substrates without the need for additional adhesives because molten fibers can act as adhesives. Therefore, the degree of coating and the initiation temperature of the birefringent islands are higher than the melting temperature of the fibers. One, preferably the melting start temperature of the island portion of the birefringent islands of the yarn may be 3 (rc or more higher than the melting temperature of the fiber, more preferably 50 ^° C or more. On the other hand, the melting start temperature of the island portion of the birefringent island-in-the-sea yarn may be higher than the melting temperature of the sea portion, and more preferably, the melt initiation temperature of the island portion of the birefringent island-in-the-sea yarn is 3 (rc or more higher than the melting temperature of the sea portion. As a result, the sea portion of the birefringent island-in-the-sea yarn may be partially or fully melted, and as a result, the fiber and / or sea portion may be partially or completely melted, thereby improving the fiber visibility and a separate adhesive. On the other hand, according to a preferred embodiment of the present invention, the melting start temperature of the island portion of the birefringent island-in-the-sea yarn may be 130 ~ 430 ^° C, the melting temperature of the isotropic fibers It is 100 ~ 40CTC, and the melting temperature of the birefringent's anatomy minutes even may be in the 100 ~ 400 ^° C the lamination temperature but this may be 100 ~ 420 X Not one.

 After all, the optical modulation film including the fabric according to the present invention has a melting start temperature of the isotropic fibers forming the weft or warp of the fabric is lower than the melting start temperature of the birefringent islands of the warp yarn forming another weft or warp, the melting start temperature of the isotropic fiber When the lamination process is performed at a temperature between the birefringent islands and the melting temperature of the yarn, some or all of the isotropic fibers are melted, so that the fiber visible phenomenon of the optical modulation film can be solved. Furthermore, since the melting temperature of the sea portion of the birefringent islands is lower than the melting start temperature of the island portion, when the lamination process is performed at the temperature therebetween, part or all of the sea portion is melted and the lamination process is performed at the temperature therebetween. In this case part or all of the seam is melted to have the effect of laminating the sheet and the fabric into one layer without a separate adhesive.

According to another aspect of the invention, the fabric may be woven into an asymmetrical tissue such that the birefringent islands-in-the-sea yarns are more exposed to the surface than the fibers. The surface of the fabric refers to either side of the fabric. Asymmetrical tissue refers to the organization of fabrics with few intersections of warp and weft, and the fabrics that float on the surface continuously in either warp or weft direction. Such asymmetrical fabrics can minimize the appearance of fabric patterns (traces of intersections of warp and weft) on the light modulating film. The fabric and substrate can be combined by various methods such as vacuum hot press laminating, which can generally leave the pattern of the fabric on the light modulating film. In other words, when the vacuum hot press lamination is described as an example, it is preferable that the non-birefringent yarn loses its yarn form after the vacuum hot press lamination process, in which case the birefringence at the intersection point of the weft and the warp by the pressure of the hot press is lost. Changes in the shape of saint-like yarn As a result, the pattern of the intersection point of the optical modulation film is left, the pattern of the intersection point may cause moiré phenomenon on the screen of the liquid crystal display, but when the birefringent islands are woven into the asymmetrical tissue to expose more to the surface than the fiber You can solve this problem,

Next, the description that can be used in the present invention will be described. Materials used for the substrate include thermoplastic and thermosetting polymers that transmit a desired wavelength of light, and may be transparent or translucent materials that are easy to transmit light. Preferably, suitable substrates may be amorphous or semicrystalline and may comprise homopolymers, copolymers or blends thereof. Specifically poly (carbonate) (PC); Syndiotactic and isotactic ticpoly (styrene) (PS); Alkyl styrenes; Alkyl, aromatic and aliphatic ring-containing (meth) acrylates including poly (methylmethacrylate) (PMMA) and PMMA copolymers; Ethoxylated and propoxylated (meth) acrylates; Polyfunctional (meth) acrylates; Acrylated epoxy; Epoxy; And other ethylenically unsaturated substances; Cyclic olephine and cyclic olephine copolymers; Acrylonitrile butadiene styrene (ABS); Styrene acrylonitrile copolymer (SAN); Epoxy; Poly (vinylcyclonucleic acid); PMMA / poly (vinylfluoride) blends; Poly (phenylene oxide) alloys; Styrene butyl copolymer; Polyimide; Polysulfones; Poly (vinyl chloride); Poly (dimethylsiloxane) (PDMS); Polyurethane; Unsaturated polyesters; Polyethylene; Poly (propylene) (PP); Poly (alkane terephthalate) such as poly (ethylene terephthalate) (PET); Poly (alkane naphthalate) such as poly (ethylene naphthalate) (PEN); Polyamides; Ionomers; Vinyl acetate / polyethylene copolymers; Salose acetate; Cellulose acetate butyrate; Fluoropolymers; Poly (styrene) -poly (ethylene) copolymers; PET and PEN copolymerizers including polyolefin PET and PEN; And poly (carbonate) / aliphatic PET blends can be used. More preferably, polyethylene naphthalate (PEN), polyethylene naphthalate copolymer (co-PEN) polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PC) alloy, polystyrene ( PS), heat-resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene (ABS), polyurethane (PU), polyimide (PI), polyvinyl chloride (PVC), styreneacrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polyamide (PA), polyacetal (POM), phenol, epoxy ( EP), urea melanin (UF ᅳ MF), unsaturated polyester (UP), silicone (SI), elastomer, cycloolefin polymer (COP, Japan ZE0N, JSR) can be used alone or in combination. More preferably the same as the sea portion of the birefringent islands You can use the minutes All. Furthermore, the substrate may contain additives such as antioxidants, light stabilizers, thermal stabilizers, lubricants, dispersants, ultraviolet absorbers, white pigments, fluorescent whitening agents, and the like, as long as the above-described physical properties are not impaired. Can be.

On the other hand, the substrate may be configured in the same manner as the components of the base and / or the components of the fiber and its optical properties in consideration of various physical properties. In this case, part or all of the substrate may be melted in the lamination process, thereby improving adhesion between the birefringent islands and the substrate without using a separate adhesive. In this case, the substrate may have three layers. Specifically, the three-stage layer may be composed of a laminated structure of skin layer (B layer) / core layer (A layer) / skin layer (B layer) by co-extrusion of a polymer. The skin layer corresponding to the fabric and corresponding to the outside of the sheet may have the same melting temperature as sea areas and / or fibers in order to improve adhesion with birefringent island-in-the-sea yarns. Materials with higher melting temperatures than sea areas and / or fibers can be used to prevent this.

Next, fibers that can be used as the weft or warp yarn of the fabric of the present invention will be described.

The additive fiber can be used without limitation of type as long as it can be woven with birefringent island-in-the-sea yarn and satisfies the above-mentioned temperature conditions. Preferably, the fiber is optical in view of being woven perpendicular to the birefringent island-in-the-sea yarn. It is preferable to use isotropic fibers because the light modulated through birefringent islands may not pass through the fiber if the fiber also has birefringence. On the other hand, the fibers may be used alone or in combination of polymer fibers, natural fibers, inorganic fibers (glass fibers, etc.), more preferably the same material and fibers as the components of the sea birefringent islands. Furthermore, according to another preferred embodiment of the present invention, 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 substrate _'

 Next, the birefringent islands used in the weft or warp yarn of the fabric of the present invention will be described. The birefringent islands used in the present invention is different in the optical properties of the island portion and sea portion to maximize the light modulation efficiency More preferably, the island portion is anisotropic and the sea portion is isotropic.

Specifically, in an island-in-the-sea island comprising an optically isotropic sea portion and an island portion having anisotropy, the magnitude of the substantial coincidence or mismatch of the refractive indices along the XJ and Z axes in space depends on the degree of scattering of the light polarized along the axis. In general, the scattering power changes in proportion to the square of the refractive index mismatch. Thus, deflection along a particular axis The greater the degree of inconsistency of the rate, the more strongly scattered light is polarized along its axis. Conversely, when the mismatch along a particular axis is small, the light polarized along that axis is scattered to a lesser extent. If the refractive index of the sea portion along the axis is substantially coincident with the refractive index of the island portion, the incident light polarized by an electric field parallel to this axis will not scatter but irrespective of the size, shape and density of the portion of the island. Will pass through. Further, when the refractive indices along the axis are substantially coincident, the light beam passes through the object without being substantially scattered. More specifically, FIG. 13 is a cross-sectional view showing a path of light transmitted through the birefringent islands of the present invention. In this case, the P wave (solid line) is transmitted without being affected by the interface between the outer and birefringent island-in-the-sea yarns and the birefringence interface between the seam and the sea portion inside the birefringent island-in-the-sea yarn, while the S-wave (dotted line) Modulation of light occurs depending on the interface between the birefringent island-in-the-sea yarns and / or the birefringent interface between the seam and the seam interface inside the birefringent island-in-the-sea yarns.

 The light modulation phenomenon at the birefringent interface is mainly generated at the interface between the substrate and the birefringent island-in-the-sea yarn and inside the birefringent island-in-the-sea yarn. Specifically, when the optical property of the substrate is isotropic. The optical modulation occurs at the interface between the substrate and the birefringent island-in-the-sea yarn as in the conventional birefringent fibers. More specifically, the refractive index of the substrate and the birefringent island-in-the-sea yarn is 0.05 or less in difference between the two axial directions. The difference in refractive index in one axial direction may be greater than or equal to 0'1. More specifically, when the refractive index of the base material and the X-axis direction is nXl, the refractive index of the y-axis direction is nYl, the refractive index of the ζ-axis direction is nZl, and the refractive index of the birefringent island-in-the-sea yarn is nX2, nY2 and ηΖ2, the substrate and the birefringence At least one of X, X, and Z-axis refractive indices of the island-in-the-sea yarn may coincide, and the refractive index of the birefringent island-in-the-sea yarn may be ηΧ2> ηΥ2 = ηΖ2.

On the other hand, in the present invention, the optical quality of the island portion and the sea portion of the birefringent islands is different, it is advantageous to create a birefringent interface. Specifically, when the island portion is anisotropic and the sea portion is isotropic, a birefringence interface may be formed at the interface between the island portion and the sea portion, and more preferably, the refractive index is 0.05 or less, and the difference between the refractive indices in the two axial directions It is preferable that the difference in refractive index with respect to one axial direction is 0.1 or more. In this case, Ρ waves pass through the birefringent interface of island-in-the-sea yarns, but S waves can cause light modulation. In more detail, the refractive index in the longitudinal direction of the birefringent island-in-the-sea yarn is nX3, the refractive index in the y-axis direction is nY3, and the refractive index in the ^ζ- axis direction is ηΖ3, When the refractive index is nX4, the refractive index in the y-axis direction is nY4 and the refractive index in the ζ-axis direction is ηΖ4, the X, Υ, and Ζ axis refractions of the substrate and the birefringent islands At least one of the rates may coincide, and an absolute value of the difference between the refractive indices of nX3 and nX4 may be 0.1 or more. Most preferably, the difference in refractive index in the longitudinal direction of the sea portion and the island portion of the island-in-the-sea yarn is 0.1 subphase, and the light modulation efficiency may be maximized when the sea portion and the island portion in the remaining two axial directions substantially coincide with each other. All. On the other hand, it is advantageous to increase the light modulation efficiency when the refractive index of the sea portion of the substrate and the birefringent islands of the sea coincides.

 Therefore, the birefringent island-in-the-sea portion and the sea portion of the birefringent islands have substantially the same refraction in two axial directions, but selecting a material having a large difference in refractive index in one axial direction improves the light modulation efficiency. effective.

The sea portion and / or island portion of the birefringent island-in-the-sea yarn that may be used in the present invention may be polyethylene naphthalate (PEN), copolyethylenenaphthalate (c PEN), polyethylene terephthalate (PET), polycarbonate ( PC), polycarbonate (PC) alloy, polystyrene (PS), heat-resistant polystyrene (PS), polymethylmethacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene ( PE), acrylonitrile butadiene styrene (ABS), polyurethane (PU), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), poly In amide (PA), polyacetal (POM), phenol, epoxy (EP), urea (UF), melanin (MF), unsaturated polyester (UP), silicone (SI), elastomer and cycloolefin polymer It may be any one or more, preferably the above portion and solution The part selects a material in which the refractive indices in two axial directions substantially match but the difference in refractive indices in one axial direction is effective to improve the light modulation efficiency. Most preferably, however, polyethylene naphthalate (PEN) is used as the island portion as the birefringent island-in-the-sea yarn 31, and copolyethylene naphthalate and polycarbonate alloy alone or in combination are used as sea portions. In this case, the brightness is remarkably improved as compared with the birefringent islands of the art made of conventional materials. In particular, when the polycarbonate alloy is used as the sea portion, a birefringent island-in-the-sea yarn having excellent optical modulation properties can be produced. In this case, the polycarbonate alloy is preferably modified with polycarbonate. It may be made of glycol polycyclohexylene dimethyl ene terephthalate (PCTG), more preferably, polycarbonate and modified glycol polycyclonuclear styrene dimethylene terephthalate (PCTG) is 15: 85 ~ The use of a polycarbonate alloy with a weight ratio of 85:15 is effective for brightness enhancement. If polycarbonate is added at less than 15%, the viscosity of the polymer necessary for securing radioactivity becomes high, There is a problem that can not use the radiator, and if it exceeds 85%, the glass transition temperature is high, after the nozzle discharge, the radiation tension is high, it is difficult to secure the radioactivity.

 Most preferably, the polycarbonate and the modified glycol polycyclonuclear silane dimethylene terephthalate (PCTG) in a weight ratio of 4: 6 to 6: 4 have the best effect on brightness enhancement. For the solution part, selecting materials that have substantially the same refractive indices in the two axial directions but having a large difference in the refractive indices in one axial direction is effective in improving the light modulation efficiency.

On the other hand, methods for converting isotropic materials to birefringence are generally known and, for example, when stretched under appropriate temperature conditions, the polymer molecules can be oriented and the material can be birefringent.

 On the other hand, according to a preferred embodiment of the present invention, the optical modulation film of the present invention may have a structured surface layer on its surface, and more specifically, the structured surface layer is formed on the surface from which light is emitted Can be. The additive structured surface layer may have a prism shape, a lenticler shape, or a convex lens shape. Specifically, the surface on which the light is emitted on the light modulation film may have a curved surface having a convex lens shape. The light may focus or defocus light transmitted through the surface. It can also have a prism pattern on the light exit surface.

Next, a method of manufacturing the light modulating film of the present invention will be described. First, weaving the fabric having the above-described configuration, and then placing the fabric between the substrate and the base material may be laminated. In this case, the lamination process may be performed in a hot press, etc., but preferably Preferably, the vacuum hot press is effective in preventing adhesion of bubbles and improving adhesion and brightness. In this case, the degree of vacuum in the pressurizing and heating steps is 5 to 500 torr, the applied pressure is 1.0 to 100 kgf / cm ^2, and the processing time ^ is preferably 30 minutes. The lamination temperature is as described above. The temperature can be appropriately selected from the temperature between the initiation temperature and the melting temperature of the fiber and / or the dissection. On the other hand, when the vacuum degree is less than 5 torr, the process efficiency may be lowered, and when it exceeds 500 torr, bubbles are removed. There is a risk of delamination. In addition, when the applied pressure is less than 1.0kgf / cm ² The adhesive force of the film may not be layered, and when the pressure exceeds 100k _g f / cm ² , the pressure is excessive, the tissue structure of the fabric may be disturbed and the arrangement of fibers may collapse. If the time is less than 1 minute, bubble removal and adhesion may be unsatisfactory, and when it exceeds 30 minutes, it is not preferable in terms of plant efficiency. On the other hand, the configuration of the liquid crystal display device including the optical modulator film of the present invention will be described with reference to FIG. 16 as an example of the liquid crystal display device employing the optical modulator film of the present invention. The reflecting plate 220 is inserted, and the 넁 cathode fluorescent lamp 230 is positioned on the upper surface of the reflecting plate 220. The optical film 240 is positioned on the upper surface of the cold cathode fluorescent lamp 230, and the optical film The 240 is laminated in the order of the diffuser plate 241, the light diffusing film 242, the prism film 243, the light modulating film 244, and the absorption polarizing film 245, but the lamination order varies depending on the purpose. Some components may be omitted or provided in plurality. For example, the diffuser plate 241, the light diffusing film 242 or the prism film 243 may be proposed in the overall configuration and may be reversed or different. It may be formed at a location. Furthermore, a retardation film (not shown) or the like may also be inserted at an appropriate position in the liquid crystal display. Meanwhile, the liquid crystal display panel 260 may be inserted into the mold frame 250 on the upper surface of the optical film 240.

 Looking at the light path, the light irradiated from the backlight 230 is an optical film.

The diffusion plate 241 of 240 is reached. The light transmitted through the diffuser plate 241 passes through the light diffusion film 242 in order to proceed the direction of light perpendicular to the optical film 240. After passing through the light diffusing film 242, the film passes through the prism film 243 and reaches the light modulating film 244 to generate light modulation. Specifically, P wave is a light side ^; Transmissive of the crude film 244 without loss, but in the case of S-waves, light modulation (reflection, scattering, refraction, etc.) occurs and is reflected back by the reflecting plate 220, which is the back of the cathode cathode fluorescent lamp 230 and the light After changing the properties of the P wave or S wave randomly is to pass through the light modulation film 244 again. Then, after passing through the hop number polarizing film 245, the liquid crystal display panel 260 is reached. Finally, the optical modulating film of the present invention is inserted into the liquid crystal display device by using the above-described principle. It is possible to expect a significant improvement in brightness compared to the modulation film. In addition, the LED can be used as a light source in place of the polar cathode fluorescent lamp 230, and the liquid crystal display device to which the optical modulation film of the present invention is applied is various. Can be used in variations of form and configuration,

On the other hand, the birefringent island-in-the-sea yarn used in the conventional optical modulation film was manufactured to have an elongation at break of 15 to 40% in order to improve the strength of the yarn. The island-in-the-sea yarn is not only difficult to align the yarns due to sagging of yarns, but also entanglement or twisting occurs between yarns. Smudges and foreign matter appear on the screen, which can reduce the quality of the display. Done,

 Accordingly, according to one embodiment of the present invention, in the method of manufacturing a light modulating film including birefringent island-in-the-sea yarn, (1) spinning a plurality of birefringent island-in-the-sea yarns through a spinneret, (2) Stretching the plurality of birefringent islands-in-the-sea yarns satisfying the following Equation 1, and (3) providing a method of manufacturing an optical modulation film including the step of placing the stretched birefringent islands-in-the-sea yarn on a substrate yarn and laminating them In order to solve the above-mentioned problems.

 <130> [Relationship 1]

 <i3i> 3000 <A <7000

 <132> 3% <Elongation at Break (B) <7%

 Where A is the spinning speed (m / min) elongation ratio.

 Specifically, the manufacturing method of the optical modulated film of the present invention satisfies the values A and B of the above-described relation 1. First, in the formula 1, A is the product of the spinning speed and the draw ratio, and the A value is less than 3000. If the yarn is high, the yarn may be entangled or twisted due to the twisting. If the yarn exceeds 7000, the tension of the yarn received in the spinning or stretching process may be so high that cutting of the yarn may occur during the process. The breaking elongation (%) of the island-in-the-sea yarn is less than 3%, and may cause a problem in that the cutting ratio is greatly increased due to the lack of flexibility of the yarn fiber generated during the weaving process. The entrepreneurs of the saints may be entangled and foreign objects and defects may occur in the optical modulation film including the same.

After all, compared to the conventional optical modulation film including birefringent island-in-the-sea yarn, the sagging of the yarn does not occur, so that the arrangement of the yarn is not disturbed or the entanglement between the yarns does not occur. It does not deteriorate the display and image quality because it does not cause smudges or foreign objects on the screen.

 [Form for implementation of invention]

 Hereinafter, the present invention will be described in detail by Examples and Experimental Examples. The following Examples and Experimental Examples are only illustrative of the present invention, but the scope of the present invention is not limited to the following Examples and Experimental Examples.

 <137> <Release] 1>

 <138> Polycarbonates and Modified Glycol Polycyclonuclear Sylenes

Isotropic PC alloy with dimethylene terephthalate (PCTG) mixed at 5: 5 as a sea component (nx = l „57, ny = 1.57, nz = l ᅳ 57, melting temperature: 145 ^° C), anisotropic PEN ( nx = l „88, ny = l, 57, nz = L57, melting start temperature: 262 ^° C.). It has a cross-section of FIG. 9 by supplying the island component and the sea component to a spinneret including a portion of the detention plate including twelve island component supply parts corresponding to FIG. 3 and a lower compartment plate having one discharge port of FIG. 8. A birefringent island-in-the-sea yarn (mono yarn, island component number: 12192 pieces, diameter: 66 ^) was prepared.

The prepared birefringent island-in-the-sea yarn (monosa) was inclined (40de / lfila), and an isotropic PC alloy fiber (melting temperature: 145 ^° C) having the same composition as the above seaweed was prepared at 60/24, and then Was woven into a fabric. The fabric was then placed into two isotropic PC alloy sheets [skin / core / skin three-layer structure, core layer (melting temperature: 149 ^° C, 150 ^ 1, polycarbonate), skin layer (melting temperature: 145 ^° C, 30 ^, polycarbonate alloy (same as sea component)] and then vacuum hot press machine (MEIKI Co., Ltd.) under vacuum of 20torr,

A light modulated film having a thickness of 400 was prepared by heating / pressing for 20 minutes at a temperature of 150 ^° C (lamination temperature) and a pressure of 15 kgf / cm ² .

FIG. 10 is an SEM image of the surface of a fabric prepared in Example 1. FIG. Through the photographs, it can be seen that the trimming does not occur in the birefringent islands used as a ramp.

<141>^'<Example2>

 <142> Polycarbonates and Modified Glycol Polycyclonuclear Silylenes

Isotropic PC alloy with dimethylene terephthalate (PCTG) mixed at 5: 5 as a sea component (nx = 1.57, ny = L57, nz = 1.57, melting temperature: 145 ^° C), anisotropic PEN (nx = l, 88, ny-1.57, nz = 1.57, melting initiation temperature: 262 ^° C. The demagnetizing partial plate corresponding to Fig. 12 was discharged to obtain birefringent island-in-the-sea yarn as shown in Fig. 14. The birefringent islands (monosa, number of components: 25040, diameter: 66.¾ffli) of FIG. 14 were injected into the spinneret including the twelve spheres) and the bottom plate of FIG. 13 (one discharge port). Prepared. At this time, P0Y (partial alignment yarn) 85/1 having a spinning speed of 2500MPM was prepared, and the FY 40/1 was prepared by performing 2.1-fold stretching at a temperature of 140 degrees.

The prepared birefringent island-in-the-sea yarn (monosa) is inclined (40de / lfila), and the isotropic PC alloy fibers (melting temperature: 145 ^° C) having the same composition as the above seaweed are referred to as weft yarn (P0Y 60/24). Weaved into a fabric for brightness-enhanced film. Then, a light modulating film having a thickness of 400 1 was prepared under the same conditions as in Example 1.

15 is a SEM photograph of the surface of the fabric produced in Example 2. The photorefraction and hair swelling do not occur in the birefringent islands used as a slope through the photograph You can see that _"

<145> <Comparative Example 1>

 <146> Polycarbonates and Modified Glycol Polycyclonuclear Silylenes

Isotropic PC alloy with dimethylene terephthalate (PCTG) mixed at 5: 5 as a sea component (ηχ = 1,57, ny ^ l, 57, nz = 1.57 _> melting temperature: 145 ^° C), anisotropic PEN (nx = l ᅳ 88, ny = 1.57, nz = 1.57, melting start temperature: 262 ^° C.) and the constituent parts.

 << 47> In order to obtain the birefringent island-in-the-sea yarn of the cross section as shown in FIG. A star-shaped island-in-the-sea yarn (mono yarn, number of island components: 1016, diameter: 19 / ιη) was prepared. After producing P0Y 85de / 12f i la with a spinning speed of 2500MPM and a spinning temperature of 290 degrees, FY 40de / 12f i la was drawn by stretching 2 „1 times at 140 degrees.

The prepared sea island yarn FY 40/12 was spun into two strands (80de / 24f i la), followed by inclination, and an isotropic PC alloy fiber (melting temperature: 145 ^° C) having the same composition as the above seaweed was wefted. To weave the fabric. Thereafter, a lamination process was performed under the same conditions as in Example 1 to prepare a light modulating film having a thickness of 400.

FIG. 6 is a SEM photograph of the surface of a fabric prepared through Comparative Example 1. FIG. Through the above picture, it can be confirmed that entanglement and trimming (A, B, C) occurred between birefringent islands used as a slope.

 Industrial Applicability

 The liquid crystal display device including the optical modulating film of the present invention is widely used for modulating light and improving luminance in liquid crystal display devices requiring high brightness, such as LCD and LED, because of excellent optical modulation performance and no defects. It is possible.

Claims

[Claims]

 [Claim 1]

 A backlight for irradiating light; A light modulation film positioned on top of the backlight and modulating the light irradiated from the backlight, including an island-in-the-sea yarn having birefringence in the substrate; and a liquid crystal display for realizing a predetermined image through the light modulated by the light modulation film. A liquid crystal display device comprising a panel, wherein the birefringent island-in-the-sea yarn has a diameter of at least 30 of mono yarns and at least 1000 islands.

 [Claim 2]

 The method of claim 1,

 The diameter of the mono yarns of the birefringent island-in-the-sea yarn is 40 to 100 Liffiffli,

 [Claim 3]

 The method of claim 1,

 The birefringent island-in-the-sea yarn is a liquid crystal display, characterized in that 15 ~ 500 denier / 1 ~ 6 strands.

 [Claim 4]

 According to claim 1,

 The birefringent island-in-the-sea yarn is a liquid crystal display device characterized in that the mono yarns or 2 to 5 strands are spliced. '

 [Claim 5]

 The method of claim 1,

 The birefringent island-in-the-sea yarn is a liquid crystal display device, characterized in that the A value of the following relation 1 is 500 or more,

 [Relationship 1]

 A = number of islands in mono yarn I Number of mono yarns forming one plywood

[Claim 6]

 The method of claim 5,

 A liquid crystal display device, wherein said A value is 1000 or more.

 [Claim 7]

 The method of claim 5,

 A liquid crystal display device characterized in that the A value is 10000 or more.

[Claim 8] According to claim 5,

 A liquid crystal display device characterized in that the A value is 20000 or more.

 [Claim 9]

 The method of claim 1,

 The birefringent island-in-the-sea yarn has a liquid crystal display device characterized in that the number of islands of the mono yarn is 5000 or more.

 [Claim 10]

 In U,

 The birefringent island-in-the-sea yarn is a liquid crystal display device characterized in that the number of islands of mono yarn is 10,000 or more.

 [Claim 11]

 The method of claim 1,

 The birefringent island-in-the-sea yarn is a liquid crystal display device characterized in that the number of islands of mono yarn is more than 20000;

 [Claim 12]

 The method of claim 1,

 The birefringent island-in-the-sea yarn is woven in the form of a fabric, wherein either the weft or the warp yarn of the fabric is a birefringent island-in-the-sea yarn and the other is a fiber, and the melting start temperature of the island portion of the birefringent seaweed yarn is melted of the fiber. Liquid crystal display characterized by higher temperature

 [Claim 13]

 The method of claim 12,

 The liquid crystal display device having optical anisotropy of the island portion of the birefringent island-in-the-sea yarn, and the sea portion and the fiber having optical isotropy.

 [Claim 14]

 The method of claim 12,

 The fiber is a liquid crystal display device, characterized in that any one or more fibers selected from the group consisting of polymer fibers, natural fibers and inorganic fibers

 [Claim 15]

 13. The liquid crystal display device according to claim 12, wherein the melting start temperature of the island portion of the birefringent island-in-the-sea yarn is higher than the melting temperature of the sea portion and / or the fiber.

[Claim 16] The liquid crystal display device according to claim 12, wherein a melting start temperature of the island portion of the birefringent islands-in-the-sea yarn is 30 ^° C or more higher than the melting temperature of the portion and / or the fiber.

[Window 17]

 The method of claim 12,

 Liquid crystal display device characterized in that the fiber and / or sea portion is part or all melted,

 [Claim 18]

 The liquid crystal display device according to claim 1, wherein the refractive index of the substrate and the birefringent island-in-the-sea yarns is less than or equal to 05 in the two axial directions and less than or equal to 0.1 in the other one axial direction. .

 [Claim 19]

 The refractive index of the sea portion and the island portion of the birefringent island-in-the-sea yarn has a difference in refractive index of 0.05 or less in two axial directions, and a difference in refractive index of the other one axial direction of 0.1 or more. LCD display.

 [Claim 20]

 The liquid crystal display device according to claim 1, wherein the refractive index of the sea portion of the birefringent island-in-the-sea yarn and the refractive index of the base material coincide.

 [Claim 21]

 The liquid crystal display device according to claim 1, wherein the birefringent island-in-the-sea yarn has an elongation at break of 3 to 7%.

 [Claim 22]

 The method of claim 21, wherein the light modulating film is manufactured by

 (1) spinning a plurality of birefringent island-in-the-sea yarns through a spinneret;

 (2) stretching the radiated plurality of birefringent islands to satisfy the following Equation 1; And

The liquid crystal display device manufactured under contains the _"; (3) the step of laying between theta laminated substrate for use even if the extended birefringence

 [Relationship 1]

 3000 <A <7000

 3 <elongation at break (B) <7%

 Where A is the spinning speed (in / min) X draw ratio.