WO2011122796A2

WO2011122796A2 - Brightness-enhancing film

Info

Publication number: WO2011122796A2
Application number: PCT/KR2011/002061
Authority: WO
Inventors: 지성대; 김규창; 조덕재; 김진수; 김도현; 양인영; 이현수
Original assignee: 웅진케미칼 주식회사
Priority date: 2010-03-30
Filing date: 2011-03-25
Publication date: 2011-10-06
Also published as: TW201211594A; KR20110108856A; WO2011122796A3; KR101167776B1

Abstract

Disclosed is a brightness-enhancing film that can prevent island component conglomeration and also reduce pilling, even when the number of island components of birefringent sea island fiber is dramatically increased.

Description

【Specification】

[Name of invention]

Brightness Enhancement Film

Technical Field

<1> The present invention relates to a luminance-enhanced film, and more particularly to a luminance-enhanced film that can not only prevent the bonding but also improve the phenomena even if the number of island components of the birefringent island-in-the-sea yarn is significantly increased. It is about.

Background Art

<2> Flat panel display technology has already secured market 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 improvement of related technologies. LC displays are currently expanding their range of use in laptops, personal computer monitors, LCD TVs, automobiles and aircraft, accounting for about 80% of the flat panel market. Soaring and booming until now,

Conventional LC displays arrange liquid crystals and electrode matrices between a pair of light absorbing optical films. In the 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 an image with a 'pixal' containing information using polarization in a specific direction. For this reason, IX displays include front and back optical films that induce polarization.

<4> The luminance-enhanced film of such an LC display does not necessarily have high utilization efficiency of light emitted from the backlight. This is because at least 50% of the light emitted from the backlight is absorbed by the rear side optical film. Therefore, in order to increase the utilization efficiency of the backlight light in the brightness enhancement film, the brightness enhancement film is provided between the optical cavity and the liquid crystal assembly. Install it.

<5> FIG. La is a figure which shows the optical principle of the conventional brightness enhancement film. Specifically, P-polarized light from the optical cavity to the liquid crystal assembly passes through the luminance-enhanced film to be transmitted to the liquid crystal assembly, and S-polarized light is reflected from the luminance-enhanced film to the optical cavity and then polarized light on the diffuse reflection surface of the optical cavity. The direction is reflected in a randomized state and is transmitted to the luminance-enhanced film, and eventually S-polarized light is converted into P-polarized light that can pass through the polarizer of the liquid crystal assembly, and then passed through the luminance-enhanced film and then transferred to the liquid crystal assembly. To do that.

The selective reflection of S-polarized light and the transmission of P-polarized light with respect to the incident light of the luminance-enhanced film are characterized in that the refractive index between the optical layers in the state that the optical layer on the plate having anisotropic refractive index and the optical layer on the plate having an isotropic refractive index are alternately stacked. It is made by the optical thickness setting of each optical layer and the refractive index change of the optical layer according to the difference and the stretching process of the stacked optical layers.

In other words, the light incident on the luminance-enhanced 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. As described above, in the diffuse reflection surface of the optical cavity, the polarization state is reflected in a randomized state and then transmitted to the luminance-enhanced film. As a result, it is possible to reduce power waste with loss of light generated from the light source.

However, the conventional luminance-enhanced film alternately stacks anisotropic optical layers and anisotropic optical layers on flat plates having different refractive indices, and extends them to obtain optical thicknesses and refractive indices between optical layers that can be optimized for selective reflection and transmission of incident polarization. Since the manufacturing process of the luminance-enhanced film is complicated, the optical layer of the luminance-enhanced film has a flat plate structure, so that the P-polarized light and the S-polarized light are separated by a wide range of incident angles of incident polarization. As the number of optical layers is excessively increased, the production cost is increased exponentially. Also, the optical performance is deteriorated due to light loss due to the structure in which the number of optical layers is excessively formed. There was this.

In this regard, it was found that the luminance-enhanced film including the birefringent island-in-the-sea yarn inside the substrate is advantageous in overcoming the above-described problem. Specifically, the use of birefringent island-in-the-sea yarns significantly improved the effects of light modulation efficiency and luminance improvement compared to the case of using conventional birefringent fibers. The sea portion partitioning the island component has isotropy. In this case, not only the interface between the island-in-the-sea yarn and the base material, but also the interface between the island components and sea portions constituting the inside of the island-in-the-sea yarn has a birefringent interface, so that a birefringent interface occurs only at the interface between the base material and the birefringent fibers. Compared to the fiber, the light modulation effect is remarkably increased, and it can be applied to the actual industrial field by replacing the laminated luminance-enhanced film. Therefore, the use of birefringent island-in-the-sea yarn is superior to the use of ordinary birefringent fibers, and the efficiency of brightness enhancement is excellent, and the optical properties of the island component and sea portion are different in the birefringent island-in-the-sea islands. In this case, the birefringence interface can be formed to improve the luminance enhancement efficiency significantly.

On the other hand, in order to maximize the light modulation effect, the larger the area of the birefringent interface inside the birefringent islands, the more advantageous, the number of island components in the birefringent islands should be larger. The island components are arranged concentrically around a single spinning core inside the island, and the cross-sectional structure is fine when the number of island components is small, but when the number of island components increases (about 300 or more), In the case of the island component adjacent to the spinning core formed at the center of the island, the density becomes large, and a phenomenon of agglomeration (conjugation phenomenon) occurs in the conductive portion located around the spinning core during the spinning process. lb is a cross section of a conventional islands-in-the-sea yarn (331 degrees of island components), and the islands components 12 are concentrically shaped around one spinning core 11 inside the islands of the islands-in-the-sea yarn. It is arranged and the cross-sectional area occupied by conductive minutes if the entire company is 30% to 70%. This cross-sectional structure does not have an abnormality when the number of island components is small, but when the number of island components increases (about 300 or more) or when the ratio of the cross-sectional area of the island components in the islands is increased, a radiation core formed at the center of the islands In the case of the island component adjacent to (11), the density becomes large, and in the spinning process, the phenomenon of agglomeration of the earth component located around the spinning core occurs. In other words, as the number of island components in the islands of the sea island increases, the island components in the center portion of the islands of the islands agglomerate to form a lump.

Therefore, the birefringent island-in-the-sea yarn having a cross-sectional shape of a conventional island-in-the-sea yarn has a problem in that the birefringence interface is reduced due to the degree of doping bonding, and thus the optical modulation efficiency is not significantly improved.

[Detailed Description of the Invention]

[Technical problem]

The present invention has been made to solve the above-mentioned problems, and the first problem to be solved by the present invention is a birefringent chart that does not occur even when the number of island components is significantly increased. It is to provide a brightness enhancing film containing yarn.

A second object of the present invention is to provide an island-in-the-sea yarn that can be used in a luminance-enhanced film and has color development in itself.

Technical Solution

In order to solve the 1st subject of this invention mentioned above, it is described; The birefringent solution In order to generate a light modulation effect, the yarn is formed with a birefringent interface at an interface between the island component and the sea component, and the birefringent island is a plurality of conductively formed radially around the core portion and the core portion to prevent conduction therein. Provided is a luminance-enhanced film including a birefringent islands-in-the-sea yarn including a minute group.

According to a preferred embodiment of the present invention, the number of island components per unit area (/ m 2) formed at the boundary between adjacent island component groups is greater than the number of island components per unit area within the island component group. Small boundaries may be formed and adjacent islands groups may be defined by the boundaries.

According to another preferred embodiment of the present invention, the boundary portion may be formed radially around the core portion.

<17> According to another preferred embodiment of the present invention, the island component, the number of number than that of the core portion per unit area ⁽²⁾ island component of the group inside the unit area ^{(2) The} island component of the number of the small and preferably It may be less than 1/2 or less than 1/3. 2) The number of island components ( ² ) per unit area of the boundary may be smaller than the number of island components per unit area within the island component group. It may be less than 1/2.

According to another preferred embodiment of the present invention, one or more annular borders may be formed around the core part.

According to another preferred embodiment of the present invention, the cross-sectional shape of the island component group may be a sector, an isosceles triangle, or an isosceles trapezoid.

According to another preferred embodiment of the present invention, the number of the plurality of island component groups may be 10 to 50, and the number of island components included in one island component group is 800 to 2000 days. ᅳ

According to another preferred embodiment of the present invention, the total number of islands contained in the birefringent island-in-the-sea yarn may be 20000 to 30000.

According to another preferred embodiment of the present invention, the birefringent island-in-the-sea yarn may have an A value of 500 or more.

<23> [Relationship 1]

<24> A = number of island components of monosa

According to another preferred embodiment of the present invention, the birefringent island-in-the-sea yarn is woven in the form of a fabric, wherein either the weft or warp of the fabric is a birefringent seaweed yarn and the other may be a fiber.

According to another preferred embodiment of the present invention, the birefringent island-in-the-sea yarn Melting start temperature of the island component may be higher than the melting temperature of the fiber.

According to another preferred embodiment of the present invention, the birefringent island-in-the-sea yarn may be woven into mono yarns.

According to another preferred embodiment of the present invention, a birefringent interface may be formed at the boundary between the island component and the sea portion of the birefringent island-in-the-sea yarn, and more preferably, the optical property of the island component is birefringent, and anatomy The optical properties of the minute may be isotropic.

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

According to another preferred embodiment of the present invention, the fiber 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 component of the birefringent island-in-the-sea yarn may be higher than the melting temperature of the sea portion.

According to another preferred embodiment of the present invention, the melt initiation temperature of the island component of the birefringent island-in-the-sea yarn may be at least 30 ^° C higher than the melting temperature of the fiber, the island component of the birefringent island-in-the-sea yarn Melting initiation temperature can be 3 ⁽ rc or higher) above the melting temperature ^{of the} sea section.

According to another preferred embodiment of the present invention, the fiber and / or sea portion may be a part or all melted.

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 refractive index of the substrate and the birefringent seaweed yarn is less than 0.05 difference in the refractive index in two axial directions, the difference in refractive index in the other one axial direction May be greater than or equal to 0.1.

According to another preferred embodiment of the present invention, the index of refraction in the X-axis direction of the substrate is nXl, the index of refraction in the y-axis direction is nYl and the index of refraction in the ζ-axis direction is nZl, and the refractive index of the birefringent island-in-the-sea yarn is nX2. , nY2 and ηΖ2, at least one of the X, Υ, and Ζ axis refractive indices of the substrate and the birefringent island-in-the-sea yarn may coincide.

According to another preferred embodiment of the present invention, the refractive index of the sea portion and the island component of the birefringent island-in-the-sea yarn is 0.05 or less in difference between the two axial directions, and the refractive index of the other one axial direction The difference can be greater than 0,1.

According to another preferred embodiment of the present invention, the birefringent island-in-the-sea yarn The refractive index in the longitudinal direction of the island component is nX3, the refractive index in the y-axis direction is nY3, and the refractive index in the ^ζ- axis direction is ηΖ3, the refractive index in the X-axis direction of the sea portion is nX4, and the refractive index in the y-axis direction is _η γ4 And when the refractive index in the ζ-axis direction is ηΖ4, at least one of the substrate, the birefringent island-in-the-sea yarn, Υ, and the Ζ-axis refractive index may coincide.

According to another preferred embodiment of the present invention, the absolute value of the difference between the refractive index of η 3 and η 4 may be 0.1 or more.

According to another preferred embodiment of the present invention, the diameter of the birefringent island-in-the-sea yarn may be 10-100.

In order to solve the second problem of the present invention described above, there is provided a luminance-enhanced island-in-the-sea yarn comprising a core portion for preventing the joining of the island inside the island-in-the-sea yarn and a plurality of groupings formed radially around the core portion. do.

<42> The preferred According to another embodiment, the number of the island component per unit area formed on the interface between the island component group adjacent than the number of the group inside the unit area ⁽²⁾ island component of ⁽²⁾ island component of the present invention Small boundaries are formed and adjacent boundary component groups can be defined by the boundaries.

According to another preferred embodiment of the present invention, the number of m 2) island components per unit area of the core portion may be smaller than the number of island components (2) within the island component group.

According to another preferred embodiment of the present invention, one or more annular boundary portions may be formed around the core portion.

According to another preferred embodiment of the present invention, the cross-sectional shape of the island group may be a sector, an isosceles triangle or an isosceles trapezoid.

According to another preferred embodiment of the present invention, the number of the plurality of island component groups may be 10 to 50, the number of island components contained in one island component group is 800 to 2000 days Can be.

According to another preferred embodiment of the present invention, the total number of islands contained in the birefringent island-in-the-sea yarn may be 20000-30000.

The terminology used herein is briefly described. <51>'Fiber has birefringence' means that when light is irradiated on fibers having different refractive indices depending on the direction, the light incident on the polymer is refracted by two different directions of light.

'Isotropic' means that when light passes through an object, the refractive index is constant regardless of the direction.

"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 light intensity, wave periodicity, or light properties.

The core portion is a portion that becomes the radiation center of the ^island component group and the boundary formed radially and means a portion having a constant area in order to prevent the joining in the cross section of the island.

<56> 'Initiation of melting' means 'the temperature at which a polymer begins to melt,'

The melting temperature 'means the temperature at which melting occurs most rapidly. Therefore, when the melting temperature of a polymer is observed by DSC, the end point of the endothermic peak due to melting is the melting start temperature. Becomes the melting temperature,

<57> 'Photochromic fibers' are not colored by physical / chemical combinations of materials of color such as dyes or pigments, but rather by the interference of light due to the structural and optical design of the fibers. It means the fiber to be expressed.

Advantageous Effects

In the luminance-enhanced film including the birefringent island-in-the-sea yarn according to the present invention, even when the number of island components is 20,000 or more, aggregation of the island components does not occur in the central portion of the islands. Therefore, since more than 20,000 islands can be formed inside one island-in-the-sea yarn, the area of the light modulation interface can be maximized, so that the light modulation effect is significantly increased. Therefore, the luminance-enhanced film including the island-in-the-sea yarn of the present invention has a very good light modulation effect, so that the optical modulation interface is used as compared with the case of using a conventional island-in-the-sea yarn having about 500 birefringent fibers or island components. Since the area of is remarkably increased, the brightness is remarkably improved.

In addition, even when weaving a birefringent island-in-the-sea yarn in the form of a woven fabric and including it in the luminance-enhanced film, there is a large number of island components in the mono yarn (birefringent island-in-the-sea yarn), so that only mono yarn improves the desired luminance. Since it is possible to achieve the improvement of the brightness, the trimming and the hair phenomena do not occur as compared with the case of weaving with dozens of birefringent islands for weaving. It becomes.

Furthermore, the island-in-the-sea yarn that can be applied to the luminance-enhanced film of the present invention can arrange the island components, thereby reducing the fineness of the island components, which is very advantageous for producing ultra-fine yarns, and the number of island components in one island-in-the-sea yarn. It can produce more than 20,000 microfibers, which can significantly reduce the production cost.

[Brief Description of Drawings]

Fig. 6 is a schematic diagram illustrating the principle of a conventional brightness enhancing film.

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

FIG. 2A is a cross-sectional photograph of a birefringent island-in-the-sea yarn, and FIG. 2B is a captive partial plate for producing the birefringent island-in-the-sea yarn of FIG. 2A, and 2C and 2D are fabrics including the birefringent island-in-the-sea yarn of FIG. 2A. It is an electron microscope photograph of.

3 is an electron micrograph of the island-in-the-sea cross-section according to the preferred embodiment of the present invention.

4 is an electron micrograph of a cross-sectional view of the island-in-the-sea yarn in accordance with a preferred embodiment of the present invention.

5 is a photograph of a fabric used in the luminance-enhanced film including the island-in-the-sea yarn of the present invention according to an embodiment of the present invention.

FIG. 6 is a cross-sectional view of the captive partial plate for island-in-the-sea yarn production according to the preferred embodiment of the present invention.

7 is a cut-away view of the lower plate of the detention for manufacturing island-in-the-sea yarn according to an embodiment of the present invention.

[Best form for implementation of the invention]

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

As described above, the island-in-the-sea yarn manufactured by the spinneret for manufacturing a conventional island-in-the-sea yarn is arranged in a concentric circle shape or randomly arranged without any spinning core in the island. do. Such a cross-sectional structure is not abnormal when the number of island components is small, but when the number of island components increases (about 300 or more), the density of the island components adjacent to the spinning core formed at the center of the island is increased. In the spinning process, agglomeration occurs between the cores located around the spinning core. In other words, the number of island components in the island of the sea islands increases, the side effect of the island components of the islands of the sea islands are aggregated to form a lump (Fig. Lb).

<7i> The inventors of the present invention through the Korean Patent Application No. 2009-7642 A luminance-enhanced film employing a birefringent island-in-the-sea yarn having a number of 1016 was manufactured through a spinneret including the detention part partial plate of FIG. 2B. FIG. 2A is a birefringent sea yarn of 1016 degrees as described above, and even when the number of birefringent sea island yarns exceeds 500, the splicing phenomenon does not occur in the center portion of the sea yarn. However, even in the case of the birefringent island-in-the-sea yarn (monosa yarn) of FIG. 2A above, the mono yarn (diameter: 19;) itself has low light modulation efficiency, so it is actually 40 de (denier) / 12 fila (strand). , 80/24 (de / fi la) and weaved it into a fabric and placed it inside the luminance-enhanced film. Specifically, FIGS. 2C and 2D show the fabric including the birefringent island-in-the-sea yarn of FIG. 2A. As the fabric 60, the birefringent island-in-the-sea yarn 61 (mono yarn) is braided to 80/24 (de / fila) as a warp yarn, and the isotropic fibers 62 are braided to weave the fabric. As a result, the light modulation efficiency was improved, but the diameter of the mono yarn was small and the number of strands was increased. Some of the mono yarns showed trimming (A, B, and C in FIG. 2C), and eventually caused the phenomenon of mauve appearing as a defect in the luminance-enhanced film. It became. Furthermore, the birefringent islands of Korea Patent Application No. 2009-7642 by themselves were still more likely to appear when the number of island components exceeds 10000.

Accordingly, in order to solve the first problem of the present invention described above, the present invention includes a base, a core part for preventing the joining inside the base, and a plurality of island component groups formed in a manner centering on the core part. The above-mentioned problem has been solved by providing a brightness enhancement film including a birefringent island-in-the-sea yarn. As a result, even when the number of island components in the birefringent island-in-the-sea yarn is formed more than 20,000, the degree of birefringence does not occur. High brightness can be maintained even when mono yarns are used without slicing yarns. This prevents entanglement and trimming between the mono yarns contained in the luminance-enhanced film. Not only does it show no defects but also no reverse polarization, resulting in a uniform brightness.

When the birefringent islands included in the luminance-enhanced film of the present invention in detail with reference to Figure 3, Figure 3 is a birefringence included in the interior of the luminance-enhanced film according to an embodiment of the present invention As a cross-sectional photograph (1000 times magnification) of a saint islands, the birefringent islands of the present invention and the plurality of island component groups 520 formed radially around the core portion 510 and the core portion 510 to prevent the conduction 530).

First, the core portion 510 formed inside the birefringent island-in-the-sea yarn will be described. The core portion 510 is formed inside the birefringent island-in-the-sea yarn to prevent conjugation. Preferably, the core portion 510 is formed at the center of the birefringent island-in-the-sea yarn and surrounded by the vertices of the island component groups 520 and 530. In general, the birefringent island-in-the-sea yarn has a higher density of island components, which results in a higher density of island components at the center of the island-in-the-sea yarn, resulting in a joining junction. Accordingly, in the present invention, the core portion 510 is formed inside the birefringent island-in-the-sea yarn to prevent the bonding even when the number of the island components is significantly increased. On the other hand, preferably, the core 510 is very much in preventing the island component per unit area of the inner group of units ⁽²⁾ per unit area of the core portion than the number of island component / m ²⁾ island component also joining the smaller the number of free Do. Specifically, C of FIG. 3 is a constant region of the core portion, and A is a predetermined region inside the island component group. When C and A are compared, it can be seen that C has a much smaller number of zm ² ) island components per unit area than A. . In case of birefringent islands, the island components expand and disperse due to dieswelling during spinning through spinnerets. If empty spaces are formed in the sea (the same is true when only seaborne components are formed), at the end of spinning, the island components will disperse and expand to the center portion of sea islands. The conjugation phenomenon that the island components are agglomerated with the island components at the center of the island-in-the-sea yarn does not occur. As a result, in the early stage of spinning, empty space is formed in the core part of seaweed yarn, but during the spinning process, the island component expands and disperses to the core part by dieswelling. because of the minute did not substantially present will be reduced to the number of dice is dwelling phenomenon occurs even if the core portion per unit area than the number of the island component group per unit area ⁽²⁾ of the island component 2) island component significantly. Preferably, the number of ( ² ) island components per unit area may be 1/2 or less, and more preferably 1/3 or less. On the other hand, the basis of the unit area is a layer that can be compared to the number of island components of the core portion 510 and the island component groups (520, 530) with the same criteria, and preferably the number of island components per ² May be, but is not limited thereto.

On the other hand, according to a preferred embodiment of the present invention, the core portion 510 has a predetermined diameter and area according to which no conjugation occurs, and the predetermined diameter and area are the diameters of the birefringent island-in-the-sea yarns. , Depending on the number of islands, Can have. Preferably, if the shape of the core portion 510 is circular, the diameter may be 0.2 to 0.2, and if the ellipse is the diameter of the major axis, 0.5 to lOim, and if the polygon to the farthest vertex based on one vertex The length may be 0.5 to 10, but is not limited thereto, and the core part 510 may be a region having a lower density of the component than the component group to prevent the joining.

Next, the island component groups 520 and 530 and the boundary part 540 which divide the island component groups 520 and 530 will be described. First, the island component of the present invention refers to an ultrafine fiber contained in the birefringent island-in-the-sea yarn, and the island components are gathered to form one island component group, and a plurality of island component groups exist. In detail, a plurality of island component groups 520 and 530 of the present invention are radially formed with the core portion 510 as described above, and the plurality of island component groups 520 and 530 are adjacent island component groups 520. It may be partitioned by the boundary portion 540 formed between the, 530. In this case preferably

The boundary part 540 may be formed radially about the core part 510, and the number of the boundary parts 540 may be one or more smaller than the number of island component groups. On the other hand, the bar preferably from between the core portion 510 and similarly the adjacent island component group (520, 530) a boundary formed between the well island component in contact with conductive than the number of the group inside the unit area ⁽²⁾ island component of the molecular group The small number of ( ² ) island components per unit area formed at the boundary is very advantageous for preventing the joining. Specifically, B in FIG. 3 is a constant region of the boundary portion 540, and A is a constant region inside the island component group 520. When B and A are compared, B is the number of m ² ) island components per unit area compared to A. It can be seen that is relatively small. In the process of spinning through the spinneret, the birefringent sea island causes the island component to expand around due to the dieswelling phenomenon. Therefore, if the boundary portion (which may be formed as a marine constituent) is formed between the island component group and the group at the beginning of the radiation, the island component expands to the boundary after the radiation is completed. Since the island component does not exist, the die swelled island component can expand to the boundary of the island-in-the-sea yarn, reducing the density of the island component within the island component group. it is possible to solve, and further _f radiation initially has not almost exist in the island component on the border of the yarn even in the first place, compared with the number of the die dwelling any phenomenon occurs turns island component group per unit area ⁽²⁾ of the island component Per unit area of boundary ( IM) The number of island components is remarkably small. Preferably, the number of () islands per unit area may be 3/4 or less, and more preferably 1/2 or less. On the other hand, the basis of the unit area is a layer divided enough to compare the number of island components of the boundary portion 540 and the island component groups 520 and 530 on the same basis, and preferably the number of sugar components can be compared. It is not limited.

Meanwhile, according to another preferred embodiment of the present invention, the boundary portion may be formed radially around the core portion, and at least one annular boundary portion may be formed around the core portion, and the annular boundary portion may be formed. It can be continuous or intermittent.

According to an aspect of the present invention, the cross-sectional shape of the island component group may be applied without limitation as long as it can be formed radially about the core portion 510, but preferably is a fan, an isosceles triangle, or an isosceles trapezoid. Can be.

According to another aspect of the present invention, the number of the plurality of island component groups may be preferably 10 to 50, and the number of island components included in one island component group is preferably goo-2000. Can be a dog.

According to another aspect of the present invention, the total number of islands contained in the birefringent island-in-the-sea yarn may be 20000 to 30000 pieces, specifically, FIGS. 3 and 4 are according to a preferred embodiment of the present invention. An optical photograph of birefringent islands, wherein the birefringent islands have 20 island component groups therein and the number of islands contained within one island component group is 1250, and the number of islands contained within the entire birefringent islands 25000 pieces. Therefore, the birefringent island-in-the-sea yarn according to the present invention preferably forms 10000 or more, more preferably 20,000 or more islands therein, and when it is used in a brightness-enhanced film, it improves brightness while preventing the occurrence of cows. Can maximize the effect.

Meanwhile, the diameter of the birefringent island-in-the-sea yarn of the present invention is not limited but is preferably 10 to

It may be 100zm, more preferably 40-100.

On the other hand, as described above, even if the number of birefringent islands in which the number of island components of FIG. 2A is 1016 is greater than 500, the degree of conduction does not occur, but the number of island components is 10000 under the same conditions. In case of more than two, not only the splicing phenomenon still occurs, but also when weaving at 80/24 (de / fila) and weaving it with the weft or inclination of the fabric as shown in FIGS. Reverse polarization occurs. According to another aspect of the present invention, When the refractive index of the island is not less than 500 when the A value of the relation 1 is greater than 500, entanglement and trimming between the mono yarns included in the luminance-enhanced film do not occur, so that no phenomenon occurs. As a result, not only defects appear on the luminance-enhanced film but also reverse polarization does not appear, so that the luminance can be maintained uniformly.

[Relationship 1]

A = number of strands of mono yarn I number of strands

In other words, in the conventional birefringent islands, when the number of islands is 300, 50 strands are used, or when the number of islands is 1016, 12 strands are used. The values of A are 6, 84.7, which is far below 500. On the other hand, when the birefringent islands of the present invention are used at 25000 degrees (1 strand), 15000 degrees (2 strands), and the like, the A values are 2500 and 7500. Since it is more than 500, the use of a mono yarn form rather than weaving several strands is significantly less likely to occur due to fiber entanglement and fiber trimming, more preferably A value of 1000 or more ， It is advantageous to use birefringent sea yarn which is more than 5000, more than 10000 or more than 20000. Most preferably, the number of island parts is 10000 or more than 20000 birefringent sea yarn. This is to use the braided yarn or about two strands are effective for the prevention and fiber entanglement Motor symptoms and most preferably, it is most effective for weaving a mono's form. 5 is a woven fabric fabricated with a mono yarn of the birefringent seaweed yarn (25000 number of islands components) of FIG. 3 as a preferred embodiment of the present invention as inclined, and as shown in FIG. Does not occur 발생

On the other hand, if the birefringent island-in-the-sea yarns are not fused with mono yarns having an equal number of island components, and mono yarns having various numbers of island components are fused together (for example, a mono with 300 islands) The average value can be defined as the number of mono yarns in ten yarns and ten mono yarns having 500 counts.

According to yet another aspect of the present invention, 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 fiber and / or sea portion. When included inside the reinforcement film, birefringent islands in the lamination process, etc. are easily moved (because they become moldy), so it is difficult to properly arrange them. Therefore, when the woven fabric including the birefringent island-in-the-sea yarn is woven and the fabric is placed between the substrates and laminated, the birefringent island-in-the-sea yarn is fixed so that it can be properly disposed. However, when the birefringent island-in-the-sea yarn in the luminance-enhanced film is inserted into the form of the fabric rather than the fiber itself, the fabric is used when it is included in the liquid crystal display. Even when the fiber constituting the fiber is made of a transparent material, when the light is irradiated from the outside (when light passes through the luminance-enhanced film from the light source of the liquid crystal display), a phenomenon occurs in which the fabric (fiber) inside is visible to the outside. It became a major obstacle to commercialization. In the present invention, the above problem is solved by providing a luminance-enhanced film in which the melting start temperature of the island portion of the birefringent island-in-the-sea yarn is higher than the melting temperature of the fiber and / or sea portion.

First, the fabric included in the luminance-enhanced film of the present invention with reference to FIG.

Explain. 5 schematically shows a fabric that can be used in the present invention

Schematic diagram. First, the fabric may be made of weft and warp yarns, either of which are weft yarns or warp yarns, which are birefringent islands, and the other fiber. When the birefringent island-in-the-sea yarn is used as a warp as shown in FIG. 5, the fiber is a warp yarn. On the other hand, weft and warp constituting the fabric may be a transparent material so that light can be transmitted.

According to an aspect of the present invention, the melt initiation temperature of the island portion of the birefringent island-in-the-sea yarn may be higher than the melting temperature of the fiber. Through this, the fabric is placed between the substrates and subjected to heat and / or pressure to carry out the lamination process if the lamination process is performed at a temperature between the melting temperature of the fiber and the melting initiation temperature of the coating. It is not melted because it is not, but the fiber is melted partly or all because the lamination process is performed at a silver higher than the melting temperature of the fiber. As a result, the fibers woven by weft or warp are melted in the lamination process and become part of the substrate, leaving only the birefringent sea island yarn inside the final luminance-reinforced film. It can be improved. Therefore, the melting initiation temperature of the island portion of the birefringent island-in-the-sea yarn is higher than the melting temperature of the fiber, but preferably, the melting initiation temperature of the island portion of the birefringent island-in-the-sea yarn is 30 ^° C. or more higher than the melting temperature of the fiber. Preferably it may be higher than 50 ^° C.

Furthermore, the melting initiation temperature of the island portion of the birefringent islands may be higher than the melting temperature of the sea portion, and more preferably, the melting initiation temperature of the island portion of the birefringent islands is higher than the melting temperature of the sea portion. ^It can be higher than ^° C. As a result, the sea portion of the birefringent island-in-the-sea yarn may be partially or fully melted. Meanwhile, 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 to 43 CTC, and the isotropic fibers The melting temperature of may be 100 ~ 400 ^° C, the melting temperature of the sea portion of the birefringent islands may be 100 ~ 400 ^° C and the lamination temperature may be 100 ~ 420 ^° C However, this is not limiting.

After all, the luminance-enhanced film including the fabric according to the present invention is an isotropic fiber because the melting temperature of the isotropic fibers forming the weft or warp yarn of the fabric is lower than the melting start temperature of the birefringent sea island yarn forming another weft or warp yarn. When the lamination process is performed at a temperature between the melting start temperature of the birefringent islands and the melting temperature of the birefringent islands, some or all of the isotropic fibers are melted, thereby solving the fiber visible phenomenon of the luminance-enhanced film. Furthermore, since the melting temperature of the sea portion of the birefringent island-in-the-sea yarn 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. If part or all of the seam is melted, it has the effect of laminating the sheet and fabric into a single layer without adhesive.

Next, the substrate that can be used in the present invention will be described. The materials used in the substrate include thermoplastic and thermosetting polymers that transmit a light wavelength in a desired range, and may be transparent or translucent materials that are easy to transmit light. Preferably, suitable substrates may be amorphous or semicrystalline and may include 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 olefins and cyclic olefin copolymers; Acrylonitrile butadiene styrene (ABS); Styrene acrylonitrile copolymer (SAN); Epoxy; Poly (vinylcyclonucleic acid); PMMA / poly (vinylfluoride) blends; Poly (phenylene oxide) alloys; Styrene block copolymers; 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 copolymers and poly (carbonate) / aliphatic PET blends, including polyolefin PET and PEN, can be used. More preferably, polyethylene naphthalate (PEN), polyethylene naphthalate copolymer (co-PEN) poly Ethylene Terephthalate (PET), Polycarbonate (PC), Polycarbonate (PC) Alloy, Paul Restyrene (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), polyamide (PA), polyacetal (POM), Phenol, Epoxy (EP), Urea, Melanin (UF.MF), Unsaturated polyester (UP), Silicone (SI), Elastomer, Cycloolefin polymer (COP, Japan ZE0N, JSR) can be used alone or in combination. More preferably, it is possible to use the same components as the sea portion of the birefringent islands. Furthermore, the substrate may contain additives such as antioxidants, light stabilizers, thermal stabilizers, lubricants, dispersants, ultraviolet absorbers, white pigments, fluorescent brighteners, 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 and optical properties of the sea portion and / or fiber and the optical properties of the substrate 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 (A1) / core layer (B1) / skin layer (A2) by co-extrusion of a polymer. Skin corresponding to the fabric and corresponding to the outside of the sheet The layer may have the same melting temperature as sea areas and / or fibers to improve adhesion with birefringent islands and seams, and the core layer may have a melting temperature of sea areas and / to prevent deformation of the sheet due to heat generation of the lamp. Alternatively, materials higher than fiber can be used.

Therefore, when the fabric of the structure described above is laminated between the sheets of the three-layer structure, the skin layer (A1) / core layer (B1) / skin layer (A2) / fabric / skin layer (A3) / core layer ( It has a structure of B2) / skin layer A4. At this time, if the melting temperature of the skin layer and the sea portion and / or the fiber is the same, the skin layer (A2 „A3) and the fabric layer which is melted and laminated on the fabric layer may form almost one layer. have.

Next, a fiber which can be used as the weft or warp yarn of the fabric of the present invention will be described.

The fiber may be woven with birefringent island-in-the-sea yarn to form a fabric, and may be used without limitation as long as it satisfies the above-described temperature conditions. Preferably, the fiber is considered in that it is woven perpendicular to the birefringent island-in-the-sea yarn. It is preferable that the optically isotropic fibers ᅳ because if the fibers also have birefringence, light modulated through birefringent islands may not pass through the fibers. Meanwhile, the fiber may be a polymer fiber, natural fiber, inorganic fiber (glass fiber, etc.) alone or It can be used in combination, and more preferably, fibers of the same material as that of the sea component of the birefringent island-in-the-sea yarn can be used.

Next, a birefringent island-in-the-sea yarn used as the weft or warp yarn of the fabric of the present invention will be described. The birefringent island-in-the-sea yarn that can be used in the present invention differs in the optical properties of the island portion and the sea portion in order to maximize the light modulation efficiency. More preferably, the island portion is anisotropic and the sea portion is isotropic.

<8> Specifically, it includes an optical part isotropic and the island part having anisotropy

The magnitude of the substantial coincidence or discrepancy of the refractive indices along the X and Z axes in space in the islands also affects the degree of scattering of light polarized along that axis. In general, the acid ranneung is changed in proportion to the square of refractive index mismatches. Thus, a group of the mismatch degree of the refraction of the particular axis ^■ The larger the more, the more the polarized light, depending on its axial strongly scattering. Conversely, when the mismatch along a particular axis is small, the light polarized along that axis is scattered to a lesser extent. When the refraction of the sea portion along a certain axis is substantially coincident with the refractive index of this island portion, the incident light polarized by an electric field parallel to this axis is not scattered and irrespective of the size, shape and density of the portion of the island. Will pass through. Also, when the refractive indices along that axis are substantially coincident, the light beam passes through the object without being substantially scattered. More specifically, FIG. 4 is a cross-sectional view showing a path of light transmitted through the birefringent island-in-the-sea yarn 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 due to the birefringent interface between the interface between the birefringent island-in-the-sea yarn and / or the interface between the island and sea within the birefringent island-in-the-sea yarn.

The optical modulation phenomenon at the birefringent interface described above occurs mainly 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 in the interface between the substrate and the birefringent island-in-the-sea yarns as in the conventional birefringent fibers. More specifically, the refractive index of the substrate and the birefringent island-in-the-sea yarns may have a difference in refractive index between two axial directions of 005 or less and a difference in refractive index for the other one axial direction may be 0.1 or more. When the refractive index 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 islands are nX2, nY2, and ηΖ2, X, X, Y At least one of the axial refractive indices may coincide, and the refractive index of the birefringent island-in-the-sea yarn may be ^η 2> ^η 2 = ^η 2. Meanwhile, in the present invention, it is advantageous that the optical quality of the island portion and the sea portion of the birefringent islands is different from each other 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 is the remaining. It is preferable that the difference in refractive index with respect to one axial direction is 0.1 or more. In this case, the p-wave passes through the birefringent interface of the island-in-the-sea yarn, but the S-wave 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, the refractive index in the ζ-axis direction is η 의 3, and the refractive index in the X-axis direction of the sea portion. When the refractive index in the nX4 and y-axis directions is nY4 and the refractive index in the ζ-axis direction is ηΖ4, at least any one of the X Υ and the Ζ-axis refractive indices of the substrate and the birefringent island-in-the-sea yarn may coincide, and the refractive indices of η 3 and η 4 are The absolute value of the difference can be greater than 0.1. 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 or more, and the light modulation efficiency may be maximized when the refractive index of the island portion and the island portion in the remaining two axial directions substantially coincide. 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 island-in-the-sea yarn coincide.

<ιοι> Therefore, the birefringent island-in-the-sea portion and the sea portion have substantially the same refractive index in two axial directions, but selecting a material having a large difference in refractive index in one axial direction is effective to improve the light modulation efficiency. to be.

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 polyethylenenaphthalate (PEN), copolyethylenenaphthalate (co-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), polyamide Any of (PA), polyacetal (POM), phenol, epoxy (EP), urea (UF), melanin (MF), unsaturated polyester (UP), silicone (SI), elastomer and cycloolefin polymer There may be more than one. Preferably, the material portion and the solution portion have substantially the same refractive indices in two axial directions, but a material having a large difference in refractive index in one axial direction is effective to improve the light modulation efficiency. Most preferably, as birefringent island-in-the-sea yarns, polyethylene naphthalate (PEN) is used as the island portion, and copolyethylene naphthalate and polycarbonate are used. When the alloy is used alone or in combination, the brightness is remarkably improved as compared to the birefringent island-in-the-sea yarns made of conventional materials. In particular, when the polycarbonate alloy is used as the sea portion, the birefringent island-in-the-sea yarn having the best optical modulation properties can be prepared. In this case, the polycarbonate alloy is preferably polycarbonate and It may be made of modified glycol polycyclohexylene dimethylene terephthalate (PCTG), more preferably polycarbonate and modified glycol polycyclonuclear silane dimethylene terephthalate (PCTG). It is effective to increase the brightness by using a polycarbonate alloy composed of a weight ratio of 85 to 15. If polycarbonate is added to less than 15¾, the viscosity of the polymer necessary for securing radioactivity becomes high, which makes it impossible to use a normal spinning machine. If it exceeds 85%, the glass transition temperature increases, and after the nozzle ejection, the radiation tension increases and the radioactivity is increased. There is a problem that is difficult to secure.

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 min, selecting materials that have substantially the same refractive indices in the two axial directions but large differences in the refractive indices in one axial direction are effective in improving the light modulation efficiency.

On the other hand, a method for converting an isotropic material into birefringence is commonly known and, for example, when drawn under suitable temperature conditions, polymer molecules may be oriented so that the material becomes birefringent. The birefringent island-in-the-sea yarn of the present invention may be manufactured by a coextrusion method or the like, but is not limited thereto.

Therefore, in the present invention, if the island-in-the-sea yarn is used as the microfiber yarn by eluting the sea portion regardless of the birefringence to produce the microfiber, the present invention does not elute the sea portion of the island-in-the-sea island in the present invention. The island-in-the-sea yarn having different optical properties of powder and island portions is used by itself. In the present invention, only the case where the island portion is composed of anisotropy and the sea portion is isotropic is assumed, but vice versa. Will be achieved.

As a result, in order to maximize the light modulation efficiency of the birefringent island-in-the-sea yarn as described above, the optical properties of the island portion and the sea portion should be different, and the area of the light modulation interface should be wide. For this purpose, the number of the drawing parts should be large, and preferably, the number of drawing parts should exceed 500. However, even if the refractive index of the island portion is anisotropic and the refractive index of the sea portion is arranged isotropic in the conventional islands and islands, the number of island portions is 500. If it exceeds, there is a fatal problem in which the agglomeration of the islands occurs and the area of the light modulation interface is reduced to decrease the light modulation efficiency. Accordingly, the birefringent islands of the present invention can prevent the phenomenon of the island portion agglomeration. As a result, the light modulation efficiency of the island-in-the-sea yarn is maximized, and when the birefringent island-in-the-sea yarn according to the embodiment of the present invention is added to the luminance-enhanced film and the luminance-enhanced film described below, a significant improvement in light modulation effect and luminance can be expected.

On the other hand, according to a preferred embodiment of the present invention, the luminance-enhanced 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 structured surface layer may be prismatic, lenticular or convex. Specifically, the surface on which the light is emitted on the luminance-enhanced film may have a curved surface having a convex lens shape. The curved surface 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 birefringent island-in-the-sea yarn of the present invention will be described. The birefringent island-in-the-sea yarn of the present invention can be applied without any limitation as long as it is a method capable of producing a conventional island-in-the-sea yarn, such as a composite spinning process. The spinnerets and spinnerets used can be used without limitation in form as long as they can produce birefringent sea yarns, but generally spinnerets and spinnerets designed to substantially match the arrangement of the parts in the cross-section of the birefringent islands Can be used. Specifically, joining the island components extruded from an appropriately designed expansion pin or a spinning nozzle so that the islands can be partitioned inside the spinneret, and the sea component streams supplied from the flow passages designed to fill the gaps therebetween, Although it can be used without any limitation as long as the spinneret capable of forming the island-in-the-sea yarn by extruding from the discharge port while gradually thinning, the birefringent island-in-the-sea yarn of the present invention can be used, but preferably the sphere shown in FIG. 6 may be radiated through a spinneret including a gold platelet. FIG. 6 is a cross-sectional view of a cage platelet plate for sea-sea yarn manufacturing according to a preferred embodiment of the present invention. 121, a plurality of radially formed around the core portion 121, the plurality of island component supply paths 122 are formed therein It is designed to include a plurality of sea component supply unit 125 formed along the periphery of the island component supply unit (123, 124) and the island component supply unit (123, 124) and including a plurality of sea component supply paths. Korean Patent Application No. 10-2010-0027670 is incorporated by reference. Meanwhile, the spinneret for radiating the birefringent island-in-the-sea yarn of the present invention may include the above-mentioned detained partial plate. If the case can be used in various combinations depending on the shape and specifications of the island. For example, the discharge portion, which is the portion where the depressed partial plate of the present invention is placed on the upper portion and the actual sea islands are discharged, may be configured in the shape of a funnel. Meanwhile preferably

As shown in FIG. 5, the lower plate 130 may include flow paths 52 and 53 for allowing polymers supplied from each island component supply unit and sea component supply unit to flow toward one discharge port 131. In this case, the flow paths 132 and 133 may be designed in various numbers and shapes according to the arrangement of the spinneret, and the discharge port 131 may be formed in an area where the flow path and the flow path intersect.

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

<ιιο> Next, a method of manufacturing the luminance-enhanced film of the present invention will be described. First, after weaving a fabric including the birefringent island-in-the-sea yarn having the above-described configuration, the fabric may be placed between the substrate and the substrate, and then laminated. At this time, the substrate usable may preferably have a three-layer structure of a skin layer / core layer / skin layer. After the lamination process, the skin layer (A1) / core layer (B) / skin layer (A2) / fabric layer (C) / skin layer (A3) / core layer (B2) / skin layer (A4) A layer may be formed, as described above, all or part of these portions may be melted if the sea layers of the birefringent islands and the melting temperatures of the fibers are the same as the skin layers A2 and A3 facing the fabric layer. At this time, the lamination process may be performed in a roll-to-roll, hot press, etc., but preferably carried out in a vacuum hot press is effective to improve the adhesion and brightness by preventing the generation of bubbles 진공 vacuum in the pressurizing and heating step in this case Is

The pressure is 5 ~ 500torr, the applied pressure is 1.0 ~ 100kgf / cm ^2, and the process time is 1 ~ 30 minutes. As described above, the lamination temperature may be appropriately selected and applied from a temperature between the melting start temperature of the island portion of the birefringent island-in-the-sea yarn and the melting temperature of the fiber and / or sea portion. On the other hand, when the vacuum degree is less than 5torr, there is a fear that the process efficiency is lowered, when the vacuum degree exceeds 500torr, there is a fear that bubble removal is uneven. Also, when the applied pressure is less than l.Okgf / αη ² , the adhesive force of the film may not be sufficient, and when the applied pressure exceeds 100 kgf / cm ² , the pressure may be excessive to disturb the tissue of the fabric, thereby collapsing the arrangement of the fibers. If the time is less than 1 minute, bubble removal and adhesion may be insufficient. If the time exceeds 30 minutes, it is not preferable in terms of process efficiency.

<πι> The luminance-enhanced film of the present invention is a flat panel display such as liquid crystal display, LED TV, projection display, plasma display, field emission display and electroluminescent display It can be widely used in technology.

[Form for implementation of invention]

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

<113> <Example 1>

<U4> polycarbonate and modified glycol polycyclonuclear silane

Anisotropic PC alloy having dimethylene terephthalate (PCTG) mixed at 5: 5 as a sea component (nx = 1.57, ny = 1.57, nz = 1.57, melting temperature: 145 ^° C), anisotropic PEN (nx = l, 88, ny = 1.57, nz = l ᅳ 57, melting start temperature: 262 ^° C.). In order to obtain a birefringent island-in-the-sea yarn having a cross-section as shown in FIG. 3, the composition is injected into a spinneret including the upper portion of the depressor plate (12 discharge holes) corresponding to FIG. 6 and the lower plate (1 discharge port) of FIG. 7. Then, the birefringent island-in-the-sea yarn (mono sand, island component number: 25040, diameter: 66, ¾ | ιπ) of FIG. 3 was produced. At this time, Υ0Υ (partial aligning yarn) 85/1 having a spinning speed of 2500Μ ΡΜ was prepared and stretched 2.1 times at a temperature of 140 degrees to prepare FY 40 / 1ol.

<ιΐ5> The prepared birefringent island-in-the-sea yarn (monosa) was inclined (40de / lfila) and the isotropic PC alloy fibers (melting temperature: 145 ^° C) having the same composition as the above-mentioned seaweeds were prepared as weft yarn (P0Y 60/24). W was woven into a fabric for luminance enhanced film.

< ⁾⁾ 6> FIG. 5 is a SEM photograph of the surface of the fabric prepared in Example 1. FIG. Through the above pictures, it can be seen that the trimming does not occur in the birefringent islands used as the warp yarn.

<117> <Comparative Example 1>

<118> pulleycarbonate and modified glycol polycyclonuclear

Isotropic PC alloy with dimethylene terephthalate (PCTG) mixed at 5: 5 as a sea component (nx = l ᅳ 57, ny = 1.57, nz = 1.57, melting temperature: 145 ^° C), anisotropic PEN (nx = L88, ny = 1.57, nz-1.57, melting start temperature: 262 ^° C.).

In order to obtain a birefringent island-in-the-sea yarn having a cross-section as shown in FIG. 2A, the composition is introduced into a spinneret including the spherical partial plate as shown in FIG. 2 corresponding to FIG. (Mono sand, the number of island components: 1016, the diameter: 19) were prepared. P0Y (partial alignment yarn) 85/12 was manufactured at a spinning speed of 2500 MPM and a spinning temperature of 290 degrees, followed by stretching 2.1 times at 140 degrees. FY 40/12 was prepared. The prepared island-in-the-sea yarn FY 40/12 two strands of plywood (80de / 24fila) were inclined and then the same components as those of the sea component Isotropic PC alloy fibers (melting temperature: 145 ^° C.) were woven into the fabric with a weft. Figure 2c is a SEM photograph of the surface of the fabric prepared in Comparative Example 1, it can be seen through the photographs that the trimming occurred in the birefringent islands used inclined.

Industrial Applicability

Since the luminance-enhanced film of the present invention has excellent optical modulation performance, it can be widely used in optical devices such as cameras and liquid crystal display devices requiring high brightness such as mobile phones, LCDs, and LED TVs.

Claims

[Range of request]

[Claim 11

materials;

A birefringent island-in-the-sea yarn is included in the substrate, wherein the birefringent island-in-the-sea yarn is formed at an interface between island and sea components in order to generate a light modulation effect, and the birefringent island-in-the-sea yarn prevents conjugation therein. A luminance-enhanced film comprising a plurality of island component groups radially formed around the core portion and the core portion, but including a birefringent sea island.

[Claim 2]

The method of claim 1,

A boundary portion having a smaller number of ( ² ) island components per unit area is formed at a boundary between adjacent island component groups than the number of island components per unit area (mi ² ) within the island component group, and the neighboring island group is partitioned by the boundary. Luminance-enhanced film 으로 characterized in that

[Claim 3]

The method of claim 2,

The boundary portion is luminance-enhanced film, characterized in that formed in the radial centered on the core.

[Claim 4]

The method of claim 1,

A luminance-enhanced film, characterized in that the number of m ² ) islands components per unit area of the core portion is smaller than the number of islands components per unit area ( ² ) in the island component group,

[Claim 5]

5. The luminance-enhanced film according to claim 4, wherein the number of ffli ² ) island components per unit area of the core portion is 1/2 or 1/3 or less than the number of island components (μ ^η2 ) island components in the island component group.

[Claim 6]

The method of claim 3,

At least one annular boundary portion is formed around the core portion. Brightness Enhancement Film

[Claim 7]

In that U term,

The cross-sectional shape of the island component group is a luminance-enhanced film, characterized in that the sector, isosceles triangle or equilateral trapezoid.

[Claim 8]

The method of claim 1,

The number of the plurality of island component groups is 10 to 50, the brightness enhancement film, characterized in that the number of island components contained in one island component group is 800 to 2000. [Claim 91]

According to the U clause,

The luminance-enhanced film, characterized in that the total number of islands contained in the birefringent islands are 20000 ~ 30000.

[Claim 10]

The method of claim 2,

The luminance-enhanced pillar, characterized in that the number of (/ in ² ) island components per unit area of the boundary portion is less than or equal to 3/4 or 1/2 of the number of (m ² ) island components in the island component group.

[Claim 111]

The method of claim 1,

The birefringent island-in-the-sea yarn is a luminance-enhanced film, characterized in that the A value of the relation 1 below.

[Relationship 1]

A = number of island components in mono

[Claim 12]

The method of claim 1,

The birefringent island-in-the-sea yarn is woven in the form of a fabric, wherein any one of the weft or warp yarn of the fabric is a birefringent island-in-the-sea yarn and the other is a brightness-enhanced film.

[Claim 13]

The method of claim 12,

Melting start temperature of the island component of the birefringent island-in-the-sea yarn is lower than the melting temperature of the fiber Brightness-enhanced film, characterized in that high.

[Claim 14]

The method of claim 12,

The birefringent island-in-the-sea yarn is luminance-enhanced

[Claim 15]

The method of claim 12,

The island portion of the birefringent island-in-the-sea yarn is optically anisotropic, and the sea portion and the fiber are optically isotropic.

[Claim 16]

The method of claim 12,

The fiber is any one or more fibers selected from the group consisting of polymer fibers, natural fibers and inorganic fibers.

[Claim 17]

13. The luminance-enhanced film of claim 12, wherein the melting start temperature of the island component of the birefringent island-in-the-sea yarn is higher than the melting temperature of the sea portion.

[Claim 18]

13. The luminance-enhanced film ᅳ according to claim 12, wherein a melting start temperature of the island component of the birefringent island-in-the-sea yarn is 3 (rc or more higher than a melting temperature of the island oil).

[Claim 19]

13. The luminance-enhanced film of claim 12, wherein the melting start temperature of the island component of the birefringent island-in-the-sea yarn is 30 ^° C or more higher than the melting temperature of the sea portion.

[Claim 20]

The method of claim 12,

The fiber is a luminance-enhanced film, characterized in that the melting part or all.

2. The method of claim 1, wherein the refractive index of the substrate and the birefringent island-in-the-sea yarn has a difference in refractive index of 0.05 or less in two axial directions, and the difference in refractive index of the other one axial direction is 0 1 or more. film.

[Claim 22]

The refractive index of the birefringent island-in-the-sea yarn and the island component has a difference in refractive index between two axial directions of 0.05 or less, and the refraction for one remaining axial direction. A luminance-enhanced film, characterized in that the difference in rate is 0 1 or more.

[Claim 23]

The method of claim 1,

The birefringent island-in-the-sea yarn has a diameter of 10 to 100, characterized in that the luminance-enhanced film.