KR101906252B1 - Multilayer reflective polizer and Manufacturing method thereof - Google Patents

Abstract

The method of manufacturing a reflective polarizer according to the present invention comprises the steps of preparing a plurality of multi-layer composite streams having different average optical thicknesses by using a plurality of composite extrusion rollers and joining them in a molten state, so that a separate adhesive layer and / It is possible to reflect all the S waves in the visible light wavelength range without the need for the PBL. This makes it possible to remarkably reduce the manufacturing cost and to maximize optical properties at a limited thickness.

Description

[0001] The present invention relates to a multilayer reflective polarizer and a manufacturing method thereof,

The present invention relates to a multilayer reflective polarizer and a method of manufacturing the same, and more particularly to a multilayer reflective polarizer including a core layer including a plurality of groups having different average optical thicknesses inside the core layer and not forming an intergroup adhesion layer, And a manufacturing method thereof.

Flat panel display technology is mainly composed of liquid crystal display (LCD), projection display, and plasma display (PDP), which have already secured a market in the TV field. In addition, field emission display (FED) and electroluminescence display (ELD) And it is expected to occupy the field according to each characteristic. Liquid crystal displays are currently being used in a wide range of applications such as notebook computers, personal computer monitors, liquid crystal TVs, automobiles, and aircrafts, accounting for 80% of the flat panel market, and booming demand for LCDs worldwide.

Conventional liquid crystal displays place a liquid crystal and an electrode matrix between a pair of light absorbing optical films. In liquid crystal displays, the liquid crystal portion has an optical state that changes accordingly by moving the liquid crystal portion by an electric field generated by applying a voltage to the two electrodes. This process displays an image by using a polarized light in a specific direction as a 'pixel' containing information. For this reason, liquid crystal displays include a front optical film and a rear optical film that induce polarization.

  The optical film used in such a liquid crystal display does not necessarily have a high utilization efficiency of light emitted from the backlight. This is because 50% or more of the light emitted from the backlight is absorbed by the back side optical film (absorption type polarizing film). Therefore, in order to improve the utilization efficiency of the backlight in the liquid crystal display, a reflection type polarizer is provided between the optical cavity and the liquid crystal assembly.

  1 is a view showing the optical principle of a conventional reflective polarizer. Specifically, the P polarized light from the optical cavity toward the liquid crystal assembly is transmitted through the reflective polarizer to the liquid crystal assembly. The S polarized light is reflected from the reflective polarizer into the optical cavity, Direction is reflected in a randomized state and is then transmitted to the reflective polarizer so that the S polarized light is converted into P polarized light that can pass through the polarizer of the liquid crystal assembly and is transmitted to the liquid crystal assembly after passing through the reflective polarizer.

The selective reflection of the S polarized light and the transmission of the P polarized light with respect to the incident light of the reflective polarizer are performed in such a manner that the refractive index of each optical layer in the state of alternately stacking the flat optical layer having the anisotropic refractive index and the flat optical layer having the isotropic refractive index The optical thickness of each of the optical layers in accordance with the difference and the elongation process of the laminated optical layer, and the change of the refractive index of the optical layer.

  That is, the light incident on the reflective polarizer repeats the reflection of the S polarized light and the transmission of the P polarized light while passing through each optical layer, and finally, only the P polarized light of the incident polarized light is transmitted to the liquid crystal assembly. On the other hand, as described above, the reflected S polarized light is reflected in the polarization state of the diffused reflection plane of the optical cavity in a randomized state and then transmitted to the reflective polarizer. As a result, it is possible to reduce the waste of power with loss of light generated from the light source.

 However, such a conventional reflective polarizer has a structure in which an isotropic optical layer and an anisotropic optical layer having different refractive indexes are alternately stacked and subjected to an elongation treatment, whereby the optical thickness and refractive index of each optical layer, which can be optimized for selective reflection and transmission of incident polarized light, The manufacturing process of the reflection type polarizer is complicated. In particular, since each optical layer of the reflective polarizer has a flat plate structure, the P polarized light and the S polarized light must be separated in accordance with a wide incident angle range of incident polarized light, so that the number of layers of the optical layer is excessively increased and the production cost exponentially There was an increasing problem. Further, there is a problem that optical performance is deteriorated due to optical loss due to the structure in which the number of layers of the optical layer is excessively formed.

2 is a cross-sectional view of a conventional multilayer reflective polarizer (DBEF). Specifically, in the multilayer reflective polarizer, the skin layers 9 and 10 are formed on both sides of the core layer 8. The core layer 8 is divided into four groups (1, 2, 3, 4), in which each of the isotropic layers and the anisotropic layers are alternately stacked to form approximately 200 layers. Separate adhesive layers 5, 6, and 7 are formed between the four groups 1, 2, 3, and 4 forming the core layer 8. In addition, since each group has a very thin thickness of about 200 layers, these groups often contain a protective layer (PBL) since individual groups can be damaged if they are individually pneumatically shipped. In this case, there is a problem that the thickness of the core layer becomes thick and the manufacturing cost rises. In addition, since the reflective polarizer included in the display panel is limited in the thickness of the core layer for slimming, if the adhesive layer is formed on the core layer and / or the skin layer, the core layer is reduced by the thickness thereof, There was no problem. Further, since the inside of the core layer and the core layer and the skin layer are bonded by the adhesive layer, there is a problem that when the external force is applied, the elapse of time elapses, or the storage place is poor, delamination occurs. In addition, not only the defect rate is excessively increased in the process of adhering the adhesive layer, but also the destructive interference to the light source occurs due to the formation of the adhesive layer.

Skin layers 9 and 10 are formed on both sides of the core layer 8 and separate adhesive layers 11 and 12 are formed between the core layer 8 and the skin layers 9 and 10 for bonding them. do. When the conventional skin layer of polycarbonate and PEN-coPEN are integrated with the alternately laminated core layer by co-extrusion, peeling may occur due to the compatibility member and the crystallization degree is about 15% There is a high risk of occurrence of birefringence. Accordingly, in order to apply the polycarbonate sheet of the non-smelting process, an adhesive layer has to be formed. As a result, the yield decreases due to external foreign matters and process defects due to the addition of the adhesive layer process. Generally, in producing a polycarbonate-free sheet of the skin layer, birefringence occurs due to uneven shear pressure due to the winding process, It is necessary to control the molecular structure of the polymer and speed control of the extrusion line in order to compensate for the deterioration of productivity.

The method of producing the conventional multilayer reflective polarizer described above will be briefly described. After four co-extruded groups having different average optical thicknesses forming the core layer are separately co-extruded, the four co-extruded four groups are stretched, And then the four layers are adhered with an adhesive to form a core layer. This is because the peeling phenomenon occurs when the core layer is stretched after bonding the adhesive. Thereafter, the skin layers are bonded to both sides of the core layer. As a result, in order to construct a multi-layer structure, a two-layer structure is folded to form a four-layer structure, and a group (209-layer) is formed through a process of forming a multi-layer structure in a continuous folding manner. It was difficult to form a group in the multilayer in the process. As a result, four groups having different average optical thicknesses have to be separately co-extruded and bonded.

Since the above-described process is intermittently performed, a remarkable increase in the manufacturing cost has been brought about. As a result, the cost of all the optical films included in the backlight unit is the most expensive. As a result, there has been a serious problem that liquid crystal displays other than the reflective polarizer are frequently released even when the decrease in luminance is reduced in terms of cost reduction.

Thus, a multi-layer reflective polarizer capable of achieving the function of a reflection-type polarizer by arranging a birefringent polymer stretched in the longitudinal direction inside a substrate, not a multilayer reflective polarizer, has been proposed. 3 is a perspective view of a reflective polarizer 20 including a rod-shaped polymer, in which birefringent polymers 22 stretched in the longitudinal direction are arranged in one direction inside the base material 21. Fig. The birefringent interface between the base material 21 and the birefringent polymer 22 causes a light modulation effect to perform the function of the reflection type polarizer. However, as compared with the above-mentioned alternately stacked reflective polarizer, it is difficult to reflect light in the entire wavelength range of visible light, resulting in a problem that the light modulation efficiency is too low. Accordingly, in order to have a transmittance and a reflectance similar to those of the alternately stacked reflective polarizer, an excessively large number of birefringent polymers 22 must be disposed inside the substrate. Specifically, in order to have optical properties similar to those of the above-described laminate-type reflective polarizer in the substrate 21 having a width of 1580 mm and a height (thickness) of 400 μm or less when a horizontal 32-inch display panel is manufactured on the basis of the vertical cross section of the reflective polarizer, At least 100% of circular or elliptical birefringent polymer 22 having a cross-sectional diameter in the longitudinal direction of 0.1 to 0.3 탆 must be contained. In this case, not only the production cost is excessively increased but also the facilities are excessively complicated, There is a problem that it is difficult to produce the facility itself and thus it is difficult to commercialize it. Further, since it is difficult to make various optical thicknesses of the birefringent polymer 22 contained in the sheet, it is difficult to reflect light in the entire visible light region, and there is a problem that the physical properties are reduced.

In order to overcome this problem, a technical idea including a birefringent sea chart was proposed in the substrate. FIG. 4 is a cross-sectional view of a birefringent chart paper included in the inside of the base material. The birefringent chart paper can generate a light modulation effect at the light modulation interface of the internal part and the dissolution part, The optical properties can be achieved without arranging chart marks. However, since the fiber is a birefringent graphite sheet, compatibility with a base material such as a polymer, ease of handling, and adhesiveness have been encountered. Furthermore, the light-scattering is induced by the circular shape, and the reflection polarizing efficiency against the light wavelength in the visible light region is lowered. As a result, the polarizing characteristic is lowered compared with the existing product and the luminance improvement is limited. In addition, As the area is subdivided, due to the occurrence of pores, light leakage, that is, light loss phenomenon, has been caused. In addition, due to the structure of the fabric in the form of a structure, there is a problem that limitations are imposed on improvement of reflection and polarization characteristics due to limitations of the layer structure.

In addition, when the surface of the reflective polarizer is directly angled to improve the luminance, there is a risk of damaging the reflective polarizer, and the pattern shape is difficult to be precisely cut, resulting in a problem that the luminance increasing effect is lower than expected.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and a first object of the present invention is to provide a multilayer reflective polarizer capable of remarkably reducing the manufacturing cost as compared with the conventional multilayer reflective polarizer, and a manufacturing method thereof.

A second object of the present invention is to provide a multi-layer reflection type liquid crystal display device which can be manufactured by integrally forming an adhesive layer between respective groups inside a core layer and can precisely tilt the pattern shape of the surface to minimize irregular reflection, And to provide a polarizer and a manufacturing method thereof.

A method of manufacturing a multilayer reflective polarizer according to the present invention for producing a multilayer reflective polarizer including a core layer in which a first component and a second component are alternately laminated is characterized by comprising the steps of: And a second component to the extruding portions, respectively; (2) repeating units of the first component and the second component form two or more multi-layered composite streams alternately stacked, and each of the multi-layer composite streams has a plurality of multi- Forming a plurality of multi-layer composite streams having different average optical thicknesses of the repeating units by injecting the first component and the second component transferred from the first and second components into a plurality of composite extrusion compartments; (3) combining the two or more multilayer composite streams to form a core layer; And (4) inducing spreading of the core layer in a flow control section; (5) stretching the core layer; And (6) forming a structured surface layer on at least one side of the stretched core layer.

 According to a preferred embodiment of the present invention, the first component is selected from the group consisting of polyethylene naphthalate (PEN), copolyethylene naphthalate (co-PEN), polyethylene terephthalate (PET), polycarbonate (PC) (PS), heat resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene ), Polyurethane (PU), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile blend (SAN), ethylene vinyl acetate (EVA), polyamide (PA), polyacetal Phenol, epoxy (EP), urea (UF), melamine (MF), unsaturated polyester (UP), silicone (SI) and cycloolefin polymers.

According to another preferred embodiment of the present invention, the second component is selected from the group consisting of polyethylene naphthalate (PEN), copolyethylene naphthalate (co-PEN), polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PS), heat resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene (PU), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile (SAN), ethylene vinyl acetate (EVA), polyamide (PA) (EP), urea (UF), melamine (MF), unsaturated polyesters (UP), silicon (SI) and cyclic olefin polymers may be used alone or in combination. More preferably, co- .

According to another preferred embodiment of the present invention, the step (2) may form three or more, but preferably four or more multi-layer composite streams.

According to another preferred embodiment of the present invention, the plurality of composite extrusion mouthpieces may be integrated.

According to another preferred embodiment of the present invention, the composite extrusion head may be a slit type composite extrusion head.

According to another preferred embodiment of the present invention, the first component conveyed in the extrusion part between steps (1) and (2) may include a plurality of layers having a different ejection amount to have different average optical thicknesses And then discharged through the first pressurizing means into different composite extrusion ports, respectively.

According to another preferred embodiment of the present invention, the second component conveyed in the extrusion part between the step (1) and step (2) includes a plurality of components having different discharge amounts in order to have different average optical thicknesses 2 compression means, respectively, into different composite extrusion ports.

According to another preferred embodiment of the present invention, the plurality of composite extrusion orifices have diameters of the polymer supply paths on the separation plate on which the first component and the second component are supplied and distributed in order to produce a multi- Can be different.

According to another preferred embodiment of the present invention, the plurality of composite extrusion orifices include a number of layers of the polymer supply path on the holding distribution plate on which the first component and the second component are supplied and distributed in order to produce a multi- May be different.

According to another preferred embodiment of the present invention, the plurality of composite extrusion tools have a number of layers of at least 50, preferably at least 100, more preferably at least 200, and most preferably at least 50, More than 300 can be.

According to another preferred embodiment of the present invention, the plurality of composite extrusion / detaching mechanisms may have a number of layers of 400 or more.

According to another preferred embodiment of the present invention, the flow control unit may be a T-die or a coat-hanger die.

According to another preferred embodiment of the present invention, the average optical thicknesses between the first component and / or the second component forming the different multilayer composite streams may be different from each other.

According to another preferred embodiment of the present invention, the optical thicknesses of the repeating units forming the same multi-layer composite stream may preferably be within 20%, more preferably within 15% of the average optical thickness.

According to another preferred embodiment of the present invention, the plurality of multi-layer composite streams may have an average optical thickness of 5% or more, preferably 10% or more.

According to another preferred embodiment of the present invention, the method may further comprise forming a primer layer on at least one side of the core layer between the step (5) and the step (6).

According to another preferred embodiment of the present invention, the structured surface layer may be a fine patterned layer, and more preferably, the fine pattern is formed of a material selected from the group consisting of prism, lenticular, microlens, triangular pyramid and pyramid pattern It can be more than one.

According to another preferred embodiment of the present invention, the step (6) may be carried out through a pattern-forming mold film.

According to another preferred embodiment of the present invention, the step (6) comprises the steps of: a) transferring the core layer; b) transferring the mold film for pattern formation formed on one surface of the reversed phase pattern of the structured surface layer; c) bringing the one side of the core layer and the one side of the pattern-forming mold film into contact with each other; d) injecting a fluid material into a region where the core layer and the mold film for pattern formation are in close contact with each other to fill the spaces between the patterns; e) applying the material to the core layer by curing the material filled between the patterns; And f) separating the mold film for pattern formation from the core layer coated with the material, wherein steps a) and b) may be performed in any order.

According to another preferred embodiment of the present invention, between step d) and step e), a step of evenly filling the material between the patterns by applying pressure to the core layer and the mold film in close contact .

According to another preferred embodiment of the present invention, the step e) may include irradiating heat or UV to the material filled between the patterns.

According to another preferred embodiment of the present invention, the step (6) comprises the steps of: i) closely contacting and transferring the core layer to a master roll formed on one surface of the reversed phase pattern of the structured surface layer, Applying a molten polymer resin to the core layer surface; And ii) UV-curing the polymer resin by irradiating UV or heat while the polymer resin is press-formed on the pattern surface of the master roll, and separating the polymer resin.

According to another preferred embodiment of the present invention, the polymer resin may be secondarily cured by irradiating UV or heat again after the step ii).

According to another preferred embodiment of the present invention, a first layer having in-plane birefringence and a second layer alternately stacked with the first layer are included so as to transmit the first polarized light to be externally irradiated and to reflect the second polarized light Wherein the first layer and the second layer are different in refractive index in at least one axial direction and the first and second layers are elongated in at least one axial direction, Wherein the repeating units form a group for reflecting a transverse wave of a desired wavelength (S wave), wherein the groups are two or more, the groups are integrally formed, and the average optical A core layer having a different thickness; And a structured surface layer formed on at least one side of the core layer.

According to another preferred embodiment of the present invention, a primer layer for enhancing adhesion between the core layer and the structured surface layer may be further included.

According to another preferred embodiment of the present invention, the structured surface layer may be a fine patterned layer, and more preferably, the fine pattern is formed of a material selected from the group consisting of prism, lenticular, microlens, triangular pyramid and pyramid pattern It can be more than one.

According to another preferred embodiment of the present invention, the prism pattern may have a height of 10 to 50 μm and a pitch of 20 to 100 μm.

According to another preferred embodiment of the present invention, the microlens pattern may have a height of 10 to 50 탆 and a lens diameter of 20 to 100 탆.

According to another preferred embodiment of the present invention, the lenticular pattern may have a height of 10 to 50 mu m and a pitch of 20 to 100 mu m.

Hereinafter, terms used in this specification will be briefly described.

'Polymer has birefringence' means that when light is irradiated to fibers of different refractive index along the direction, the light incident on the polymer is refracted into two light beams with different directions.

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

'Anisotropy' means that the optical properties of an object are different according to the direction of light, and anisotropic objects have birefringence and correspond to isotropy.

'Light modulation' means that the irradiated light reflects, refracts, scatters, changes the intensity of the light, the period of the wave or the nature of the light.

The manufacturing method of the present invention requires a separate adhesive layer and / or a protective layer (PBL) in the core layer since a plurality of multi-layer composite streams having different average optical thicknesses are manufactured using a plurality of composite extrusion / It is possible to reflect all of the S waves in the visible light wavelength range. This makes it possible to remarkably reduce the manufacturing cost and to maximize optical properties at a limited thickness.

Furthermore, the risk of damage to the reflective polarizer can be minimized compared with the case of forming a fine pattern with a conventional direct angle, and the pattern shape can be precisely tilted to prevent irregular reflection and to maximize the luminance increase effect.

1 is a schematic view for explaining the principle of a conventional reflective polarizer.
2 is a cross-sectional view of a currently used multi-layer reflective polarizer (DBEF).
3 is a perspective view of a reflection type polarizer including a bar-shaped polymer.
4 is a cross-sectional view showing a path of light incident on a birefringent chart used for a reflection type polarizer.
Fig. 5 is a perspective view of the claw distribution plates of the slit-type extrusion head which can be used in the present invention, Fig. 6 is a bottom view thereof, and Fig. 7 is a coupling diagram.
8 is a cross-sectional view of a multi-layer composite flow according to a preferred embodiment of the present invention.
9 is a schematic diagram including two first pressing means for forming two multi-layer composite streams according to a preferred embodiment of the present invention.
10 is a schematic diagram including two second pressurizing means for forming two multi-layer composite streams according to a preferred embodiment of the present invention.
11 is a schematic view showing a laminated portion of a multilayer composite flow according to a preferred embodiment of the present invention.
Figure 12 is a cross-sectional view of a coat-hanger die in accordance with a preferred embodiment of the present invention, and Figure 13 is a side view.
FIG. 14 is a schematic view of a process of forming a fine pattern according to a preferred embodiment of the present invention, and FIG. 15 is a cross-sectional view showing the detailed structure of the forming unit of FIG.
16 is a schematic view of a process of forming a fine pattern according to a preferred embodiment of the present invention.
17 is a schematic view of a process of forming a fine pattern according to a preferred embodiment of the present invention.
18 is a cross-sectional view of a multilayer reflective polarizer according to a preferred embodiment of the present invention.
19 is a sectional view of a multilayer reflective polarizer according to another preferred embodiment of the present invention.
20 is a cross-sectional view of a multilayer reflective polarizer according to another preferred embodiment of the present invention.
FIG. 21 is a perspective view of a reflective polarizer in which a lenticular pattern is regularly formed according to a preferred embodiment of the present invention, and FIG. 22 is a perspective view of a reflective polarizer in which a lenticular pattern is irregularly formed.
FIG. 23 is a perspective view of a reflective polarizer in which microlenses are regularly formed according to a preferred embodiment of the present invention, and FIG. 24 is a perspective view of a reflective polarizer in which microlenses are irregularly formed.
FIG. 25 is a perspective view of a reflective polarizer in which a prism pattern is regularly formed according to a preferred embodiment of the present invention, and FIG. 26 is a perspective view of a reflective polarizer in which a prism pattern is irregularly formed.
27 is a schematic view of an apparatus for manufacturing a multilayer reflective polarizer according to a preferred embodiment of the present invention.
28 is a schematic view of an apparatus for manufacturing a multilayer reflective polarizer according to another preferred embodiment of the present invention.
29 is a schematic view of an apparatus for manufacturing a multilayer reflective polarizer according to another preferred embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail with reference to the accompanying drawings.

According to a preferred embodiment of the present invention, there is provided a method of producing a multilayer reflective polarizer wherein a first component and a second component comprise alternately laminated core layers, the method comprising the steps of: (1) ; (2) repeating units of the first component and the second component form two or more multi-layered composite streams alternately stacked, and each of the multi-layer composite streams has a plurality of multi- Forming a plurality of multi-layer composite streams having different average optical thicknesses of the repeating units by injecting the first component and the second component transferred from the first and second components into a plurality of composite extrusion compartments; (3) combining the two or more multilayer composite streams to form a core layer; And (4) inducing spreading of the core layer in a flow control section; (5) stretching the core layer; And (6) forming a structured surface layer on at least one side of the elongated core layer.

First, as step (1), the first component and the second component are supplied to the extruding portions, respectively. The first component can be used without limitation as long as it is used in a conventional multilayer reflective polarizer as a polymer dispersed in the second component forming the substrate, preferably polyethylene naphthalate (PEN), copolyethylene naphthalate (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 SAN, ethylene vinyl acetate (EVA), polyamide (PA), polyacetal (POM), phenol, epoxy (EP), urea (UF), melanin (MF), unsaturated polyesters And cyclic olefin polymers can be used More preferably PEN.

The second component forms a substrate and can be used without limitation as long as it is used as a material of a substrate in a multilayer reflective polarizer. Preferably, the second component is selected from the group consisting of polyethylene naphthalate (PEN), copolyethylene naphthalate (co-PEN) (PS), polymethylmethacrylate (PMMA), polybutylene terephthalate (PBT), poly (ethylene terephthalate), poly (ethylene terephthalate) Polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene (ABS), polyurethane (PU), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile blend (EVA), polyamide (PA), polyacetal (POM), phenol, epoxy (EP), urea (UF), melanin (MF), unsaturated polyester (UP) Can be used alone or in combination And more preferably monomers such as dimethyl-2,6-naphthalene dicarboxylate, dimethyl terephthalate and ethylene glycol, cyclohexanedimethanol (CHDM) may be co-PEN suitably polymerized.

Meanwhile, the first component and the second component may be separately supplied to independent extruders, and in this case, the extruder may be composed of two or more. It is also included in the present invention to feed one extruded portion including a separate supply path and a distribution port so that the polymers do not mix. The extruder may be an extruder, which may further include a heating means or the like to convert the supplied polymers in the solid phase into a liquid phase.

Next, as step (2), two or more multi-layer composite streams in which the repeating units of the first component and the second component are alternately stacked are formed, and each of the multi-layer composite streams is formed so as to reflect a transverse wave , And the first component and the second component transferred from the extrusion unit are put into a plurality of compound extrusion compartments to form two or more multilayer composite streams having different average optical thicknesses of the repeating units.

5 to 7 are a perspective view, a bottom view, and a coupling view of the cage dividing plates of the slit type extrusion orifice usable in the present invention. FIG. 6 is a perspective view showing the coupling structure of the detent plates of the slit-type extrusion apparatus. FIG. The first receiving distribution plate S1 located at the upper end of the slit-shaped extrusion opening may be constituted by the first component supply path 50 and the second component supply path 51 in the interior thereof. So that the first component transferred through the extrusion portion can be supplied to the first component supply path 50 and the second component can be supplied to the second supply path 51. A plurality of such supply paths may be formed as the case may be. Polymers that have passed through the first receiving distribution plate S1 are transported to the second receiving distribution plate S2 located below. The first component injected through the first component supply path 50 is branched and transferred to the plurality of first component supply paths 52 and 53 along the flow path. In addition, the second component injected through the second component supply path (51) is branched and transferred to the plurality of second component supply paths (54, 55, 56) along the flow path. The polymers passing through the second separating distribution plate S2 are transported to the third separating distribution plate S3 located below.

The first component supplied through the first component supply paths 52 and 53 is connected to the first component supply paths 60, 61, 62, 63, 67, 68, 69, 70 along the flow path. Similarly, the second components injected through the second component supply paths 54, 55 and 56 are respectively connected to the second component supply paths 57, 58, 59, 64, 65, 66 , 71, 72 and 73 along the flow path. The first component introduced through the first component supply passages 60 and 67 of the first component supply passages formed in the third pickling distribution plate S3 is supplied to the first component supply passages 60 and 67, To the first flow path 74 of the first flow path 74. Likewise, the first component injected through the second component supply paths 57, 64 and 71 of the second component supply paths formed in the third pickling distribution plate S3 flows through the second component supply path 57, To the second one of the first and second flow paths (75). In this way, the first component transferred through the first component supply paths of the third holding distribution plate S3 is distributed to the odd-numbered flow paths 74, 76, 78, 80 of the fourth holding distribution board S4 And the second component transferred through the second component supply paths of the third component distribution plate S3 is transferred to the even flow channels 75, 77, 79 of the fourth component distribution plate S4. Whereby the first component and the second component can be alternately stacked. According to the above-described principle, the lower portion of the fourth housing distribution plate S4 may further include a separation plate (not shown) perpendicular to the flow direction of the fourth housing distribution plate and having a larger number of flow channels, It is obvious to those skilled in the art to extend the number of channels by the number. On the other hand, the first component transferred through the odd-numbered flow paths 74, 76, 78, 80 of the fourth bundled distribution plate S4 is divided into the odd-numbered flow paths 81, And the second component transferred through the even-numbered flow paths 75, 77 and 79 of the fourth holding distribution plate S4 is transferred to the fifth holding distribution plate 82, 84, 86, 88, 90, 91, 92 of the first to fifth flow paths S5, S5. FIG. 6 is a bottom view of the slit-type push-pulling apparatus of FIG. 5, and the outlet of the fifth pick-up distributing plate S5 is formed integrally with a slit-type not separated by a hole type. Whereby the first component and the second component form respective layers. Therefore, the number of layers of the multilayer composite stream can be determined according to the number of slits in the fifth holding distribution board S5. The number of preferable layers may be 100 or more, more preferably 150 or more, more preferably 200 or more, and most preferably 300 or more. Thereafter, the multilayer composite flow is discharged through the discharge port 94 of the sixth holding distribution plate. 8 is a cross-sectional view of a multi-layer composite current flow, in which the first component 100, 102 and the second component 101, 103 are alternately laminated. In this case, one of the first component 100 and the deposited second component 101 can be defined as a repeating unit, and one compound stream includes a plurality of repeating units.

5 to 7 are illustrations of a cowling distribution plate that can be used in a slit-type extrusion apparatus according to the present invention. In order to manufacture a multi-layer composite stream in which a first component and a second component are alternately stacked, It is obvious that a person skilled in the art will appropriately design and use the number, structure, size and shape of the holding hole, the slit size of the fifth holding distribution plate, and the size of the discharge port. On the other hand, the diameter of the slits in the bottom view of the fifth housing distribution plate may be 0.17 to 0.6 mm, and the diameter of the discharge port may be 5 to 50 mm, but the present invention is not limited thereto. The diameter of the slit and the like are well known to those skilled in the art.

On the other hand, the plurality of multi-layer composite streams have different optical thicknesses, the number of repeating units, etc. of the repeating units of alternately stacked first and second components forming different multi-layer composite streams to cover different wavelength ranges of light, can do. For this purpose, the size of the spinneret, the thickness of the slit, the shape, or the number of layers may be different from each other in each multilayer extrusion opening. The reflection type polarizer, which is finally manufactured through the spreading and stretching processes, has a plurality of repeating units stacked therein to form one group, and each group can be set to have a different average optical thickness.

More specifically, the optical thickness means n (refractive index) x d (physical thickness). Therefore, if two multilayer composite streams are formed, the optical thickness is proportional to the physical thickness (d) if there is no difference in refractive index between the first and second components of the multi-layer composite stream. Therefore, by varying the average value of the physical thickness (d) of the repeating units of the first component and the second component contained in each of the multi-layer composite streams, it is possible to derive the difference in optical thickness between the multi-layer composite streams. For this purpose, the thickness of the slits included in the slit-type extrusion opening can be designed differently for each extrusion opening, thereby making it possible to produce multi-layer composite streams having different average optical thicknesses.

 On the other hand, in order to cover the entire visible light region, the average optical thickness of the multilayer composite flow must be determined so as to correspond to various light wavelengths. For example, in order to set the average optical thicknesses of the repeating units of the multi-layer composite stream such that three complex streams are formed and correspond to 450 nm, 550 nm and 650 nm of the wavelength range of each light, the average optical thickness May be at least 5% different, more preferably at least 10% different. This allows reflection of the S wave in the entire visible region. In this case, the thicknesses of the first component and the second component forming the same repeating unit may be the same.

 Also, the number, the cross-sectional area, the shape, the diameter of the slit, and the like of the spinneret holes may be the same or different in the slit-type extrusion nozzle forming one multilayer composite flow. Furthermore, the optical thickness of the repeating units forming the same multi-layer composite stream may have a deviation of preferably 20% or less, more preferably 15% or less, relative to the average optical thickness. For example, if the average optical thickness of the repeating units of the first multi-layer composite stream is 200 nm, the repeating units forming the same first multi-layer composite stream may have an optical thickness variation within about 20%. On the other hand, the wavelength of light and the optical thickness are defined by the following relational expression (1).

[Relation 1]

λ = 4nd

Where? Is the wavelength of light (nm), n is the refractive index, d is the physical thickness (nm)

Therefore, when the optical thickness (nd) deviates, it is possible to cover not only the wavelength of the target light but also the wavelength range of the light including the target, thereby greatly improving uniform optical properties. On the other hand, d means the thickness of one layer, and since the repeating unit is composed of two layers of the first component and the second component, if the physical thicknesses of the first component and the second component are the same, Can be defined according to the following relation (2).

[Relation 2]

? = 2 (n ₁ d ₁ + n ₂ d ₂ )

(Nm), n ₁ is refractive index of one layer, n ₂ is refractive index of two layers, d ₁ is physical thickness of one layer (nm), and d ₂ is physical thickness of two layers (nm).

 The deviation of the optical thickness described above can be attained through imparting a deviation to the number, the cross-sectional area, the shape, the diameter of the slit or the like of the fixing hole in one slit-type extrusion mouth, or naturally achieved through a fine pressure distribution in the spreading process or the like You can.

Therefore, the plurality of multi-layered composite streams of the present invention can cover the entire visible light region by setting the average optical thicknesses of the repeating units constituting the composite stream differently, It is possible to reflect an S wave in a wide wavelength range by giving a deviation. Furthermore, although FIGS. 5-7 illustrate the production of one multi-layer composite stream in one slit-type extrusion slot, sections are added to the inside of the slit-type extrusion slot to produce a plurality of multi-layer composite streams, Is also included in the scope of the present invention corresponding to the integral slit-type extrusion mouthpiece. In addition, the thickness of the slit included in the slit-type extrusion slot can be designed differently for each extrusion slot to produce multi-layer composite streams having different average optical thicknesses.

 According to another preferred embodiment of the present invention, the first component conveyed in the extrusion part between steps (1) and (2) may include a plurality of components having different ejection amounts to have different average optical thicknesses 1 pressing means, respectively, into different slit-type extrusion ports. Specifically, FIG. 9 is a schematic diagram including a first pressing means for forming two multi-layer composite streams, in which a first component transferred from an extrusion (not shown) passes through the plurality of first pressing means 130,131 And is separately supplied to each of the slit-shaped extrusion ports 132, 133 in each of the first pressurizing means 130, 131. In this case, the first pressurizing means 130 and 131 have different discharge amounts, and an area difference occurs. When the slits 132 and 133 have the same specifications (when the diameters of the slits are the same) The average optical thickness of the first multi-layer composite stream and the second multi-layer composite stream formed through the second multi-layer composite stream may be different.

To this end, the discharge amount of the first pressurizing means 130 and 131 may be preferably 1 to 100 kg / hr, but is not limited thereto.

On the other hand, one first pressing means feeds the first component to the two slit-type push-pull corners and the two multi-layer composite streams formed by the two slit-type push-pull cores are joined to form one multi-layer composite stream, It is also possible that a group is formed. In this case, the final reflection type polarizer may be formed of four groups through four first component pressing means and eight slit type extrusion / detaching mechanisms. It is also possible that one of the first pressing means transports the first component to three or more slit-shaped push-pull tabs.

According to another preferred embodiment of the present invention, the second component conveyed in the extrusion part between the step (1) and step (2) includes a plurality of components having different discharge amounts in order to have different average optical thicknesses Respectively, through the two pressing means. Specifically, FIG. 10 is a schematic diagram including two second pressing means for forming two multi-layer composite streams, wherein a second component transferred from an extrusion (not shown) And is separately supplied to each of the slit-shaped extrusion seats 142, 143 in each of the second pressurizing means 140, 141. At this time, the first pressurizing means 150 and 151 have different discharging amounts, and through which the slits 152 and 153 have the same specifications (when the shape diameters of the supply conduits, etc. are the same) Layer composite stream and the second component of the second multi-layer composite stream may have different average optical thicknesses. For this, the discharge amount of the second pressing means 150 and 151 may be preferably 1 to 100 kg / hr, but is not limited thereto.

On the other hand, one second pressurizing means feeds the second component to the two slit-type extrusion drills, and the two multi-layer composite streams formed in the two slit-type extrusion drums are joined to form one multi-layer composite stream, It is also possible that a group is formed. In this case, the final reflection type polarizer may be formed of four groups through four second component pressing means and eight slit-type extrusion / detaching units. It is also possible that one second pressing means transports the second component to three or more slit-shaped extrusion orifices.

In the next step (3), the two or more multilayer composite streams are combined into one to form a core layer. Specifically, FIG. 11 is a schematic view showing a laminated portion of a multilayer composite flow, in which a plurality of multi-layer composite flows 161, 162, 163, and 164 manufactured through respective slit- Lt; / RTI > Meanwhile, the lapping step may be performed in a separate place, or in a case where an integral slit-type extrusion / detaching unit is used, the laminating unit may be joined together through a separate collecting / collecting distribution plate. When the number of the multi-layered composite streams is large, it is also possible to perform a multi-stage laminated structure in which some multi-layer composite streams are first lapped and lapped again to facilitate laminating.

Meanwhile, a separate preliminary spreading step may be further carried out between the steps (2) and (3) or between the steps (3) and (4) to facilitate the spreading of the repeating units described below.

Next, in step (4), the core layer is allowed to spread in the flow control section. Specifically, Figure 12 is a cross-sectional view of a coat-hanger die, which is one type of preferred flow control that may be applied to the present invention, and Figure 13 is a side view. The degree of spreading of the core layer can be appropriately adjusted to adjust the repeating unit to have an optical thickness suitable for reflecting light of a desired wavelength. This can be suitably designed in consideration of further reducing the optical thickness in the subsequent stretching process. Specifically, in FIG. 12, the core layer having the skin layer sandwiched therebetween is spread widely to the left and right in the coat-hanger die, so that the first component included therein also spreads to the left and right. In addition, as shown in the side view of FIG. 13, the coat hanger die is widely spread to the left and right but has a structure of shrinking up and down so that the skin layer purges horizontally in the laminated core layer and shrinks in the thickness direction. This is based on Pascal's principle, in which the fluid in the enclosure is guided to spread widely in the width direction by the principle that the pressure is transmitted to the fine portion by a certain pressure. Therefore, the outlet size is wider in the width direction than the die inlet size, and the thickness is reduced. This requires the use of the Pascal principle in which the molten liquid material can flow and shape controlled by pressure in a closed system, preferably a polymer flow rate and viscosity induction such that a flow of laminar flow of less than 2,500 Reynolds numbers is preferred. When the flow of the turbulent flow is 2,500 or more, the induction of the plate-like type becomes uneven, and there is a possibility that the optical characteristic is varied. The left and right die width of the outlet of the coat-hanger die may be between 800 and 2,500 mm and the fluid flow of the polymer is required to regulate the pressure so that the Reynolds number does not exceed 2,500. The reason is that the polymer flow becomes turbulent and the arrangement of the cores may be disturbed. Also, the internal temperature may be 265 to 310 ° C.

The flow control unit may be a T-die or a manifold type Coat-hanger die capable of inducing the spread of the repeating unit, but is not limited thereto, and may be used without limitation as long as it can induce spreading of the core layer.

The manufacturing method of the present invention requires a separate adhesive layer and / or a protective layer (PBL) in the core layer since a plurality of multi-layer composite streams having different average optical thicknesses are manufactured using a plurality of composite extrusion / It is possible to reflect all of the S waves in the visible light wavelength range. This makes it possible to remarkably reduce the manufacturing cost and to maximize optical properties at a limited thickness.

According to a preferred embodiment of the present invention, after step (4), the reflective polarizer is stretched as step (5).

First, the step of cooling and smoothing the polarizer transferred from the flow control unit may be performed by cooling the same used in the production of a general reflective polarizer, solidifying it, and then performing a smoothing step through a casting roll process or the like.

Thereafter, a step of stretching the polarizer through the smoothing step is performed. The stretching may be performed through a conventional stretching process of a reflective polarizer, thereby causing a refractive index difference between the first component and the second component to cause a light modulation phenomenon at the interface, and the stretch- The optical thickness corresponding to the desired wavelength range is finally obtained. Therefore, in order to adjust the optical thickness of the repeating unit in the final reflective polarizer, it can be appropriately set in consideration of the slit diameter, spreading inducing condition, and stretching ratio of the slit-type extrusion / For this purpose, the uniaxial stretching or biaxial stretching can be preferably performed in the stretching step, and more preferably uniaxial stretching can be performed. In the case of uniaxial stretching, stretching can be performed in the longitudinal direction. The stretching ratio may be 3 to 12 times. On the other hand, a method of changing an isotropic material to birefringent is commonly known. For example, when stretching under appropriate temperature conditions, polymer molecules may be oriented so that the material becomes birefringent.

Next, as a step, the final reflective polarizer can be manufactured through a step of heat-setting the stretched polarizer. The thermal fixation may be heat-set through a conventional method, preferably at 180 to 200 ° C for 0.1 to 3 minutes through an IR heater.

On the other hand, in the present invention, when the average optical thickness of the target repeating unit between groups is determined, the reflection type polarizer of the present invention can be manufactured by properly controlling the slit size, the size of the flow control unit, and the stretching ratio .

Next, a structured surface layer is formed on at least one surface of the reflective polarizer (core layer) manufactured as the step (6). At this time, a primer layer may be further formed on at least one surface of the core layer to facilitate the formation of the structured surface layer. This makes it possible to improve the adhesion, appearance and electrophotographic characteristics of the structured surface layer. Examples of the material include, but are not limited to, acrylic, ester, and urethane. The primer layer can be formed thinner than the other layers, and the thickness of the primer layer can be adjusted to improve the light transmittance and reduce the reflectance.

The thickness of such a primer layer may be from 5 nm to 300 nm. If the thickness of the primer layer is less than 5 nm, the adhesion between the core layer and the structured surface layer may be insufficient. If the thickness of the primer layer exceeds 300 nm, unevenness or molecular aggregation may occur during primer treatment.

Meanwhile, the reflective polarizer of the present invention can form a structured surface layer on at least one surface to maximize the light collecting effect and prevent irregular reflection on the surface, thereby remarkably improving the brightness.

The structured surface layer that can be applied in the present invention is a structure capable of improving the light collecting effect, and may be a fine pattern layer. The fine patterns that can be applied in this case may be any one or more selected from the group consisting of prisms, lenticular, microlenses, triangular pyramid, and pyramid patterns, and each of them may be formed by forming a pattern alone or in combination. Also, even when a pattern is formed alone, the pattern may be constant, or the height, the pitch, and the like may be differently arranged.

The material of the structured surface layer is preferably a polymer resin including a thermosetting or photocurable acrylic resin or the like. For example, the prism pattern can be an unsaturated fatty acid ester, an aromatic vinyl compound, an unsaturated fatty acid and a derivative thereof, or a vinyl cyanide compound such as methacryl nitrile. Specific examples thereof include uretanic acrylate, methacrylic acrylate Resin or the like can be used. The structured surface layer can also be made of a material having a higher refractive index than the reflective polarizer.

On the other hand, the fine pattern layer can be produced through a mold film for pattern formation. As the material of the mold film for pattern formation, a film having transparency, flexibility, predetermined tensile strength and durability can be used, and it is preferable to use a PET film.

In this case, according to a preferred embodiment of the present invention, the step (6) includes the steps of: i) closely contacting and transferring the core layer to a master roll formed on one side of a pattern that is a reverse phase of the structured surface layer, Applying a molten polymer resin to the core layer surface; And ii) UV-curing the polymer resin by irradiating UV or heat while the polymer resin is press-formed on the pattern surface of the master roll, and separating the polymer resin.

According to another preferred embodiment of the present invention, the polymer resin may be secondarily cured by irradiating UV or heat again after the step ii).

14 is a schematic view of a process of forming a fine pattern according to a preferred embodiment of the present invention, and FIG. 15 is a cross-sectional view showing a detailed structure of the molding unit of FIG. In FIG. 14, the reflective polarizer 770 is released from the star trolley 755 and passes through the guide roll 754 and the infrared lamp 751. In this process, the reflection type polarizer 770 is surface-modified by the infrared rays of the infrared lamp, and the adhesion with the pattern formation layer 771 is improved. The reflective polarizer 770 leaving the star trolley 755 enters the master roll 705 via the pattern guide roll 764 so that the patterned surface of the master roll 705 from the injection unit 742, (771) material, a pattern layer polymer is applied and merged with the base layer (770). In this process, the resin is a resin melted at room temperature and can be primary-cured due to the primary UV light emitted from the primary UV curing unit 752 provided under the master roll 705. In this case, the temperature around the curing unit 752 is 20 to 30 ° C, the temperature of the heat generated when the resin is cured is 40 to 80 ° C, and the glass transition temperature (Tg:

A temperature that indicates a change in properties such as soft rubber before undergoing a complete phase change from solid to liquid). In the glass transition state, the pattern forming layer 771, which completely copies the pattern shape of the master roll surface, passes through the pattern guide rolls 764 again, and a pattern in which the reflection type polarizing element 770 and the pattern forming layer 771 are combined is formed Shaped by the reflection type polarizer 772, passed through the guide roll 754, and wound on the finish roll 756.

As shown in FIG. 15, the cross section of the reflection type polarizer 772 formed with the turn produced by irradiating UV twice is a surface contrary to the cross section of the master roll 705. For example, If it is an engraved surface, the reflective polarizer 772 with the turn formed becomes the embossed surface of the emboss.

In this case, according to a preferred embodiment of the present invention, the step (6) includes the steps of: a) transferring the core layer; b) transferring the mold film for pattern formation formed on one surface of the reversed phase pattern of the structured surface layer; c) bringing the one side of the core layer and the one side of the pattern-forming mold film into contact with each other; d) injecting a fluid material into a region where the core layer and the mold film for pattern formation are in close contact with each other to fill the spaces between the patterns; e) applying the material to the core layer by curing the material filled between the patterns; And f) separating the mold film for pattern formation from the core layer coated with the material, wherein steps a) and b) may be performed in any order.

Preferably, between step d) and step e), a pressure is applied to the adhered core layer and the mold film to fill the material evenly between the patterns.

Advantageously, the step e) may comprise irradiating the material filled between the patterns with heat or UV.

16 is a schematic view of a process of forming a fine pattern according to another preferred embodiment of the present invention. First, the reflective polarizer 810 wound on the first roll 820 is conveyed by guide rollers 830a through 830c. At this time, the shaping mold 842 of the pattern molding unit 840 is also conveyed / rotated while being wound around the master roll 844 and the pattern guide rolls 846a and 846b. At this time, since the master roll 844 is engaged with the guide rolls 830c and 830d, the reflective polarizer 810 is attracted to the guide roll 830c and engaged with the molding die 842. [ Here, the guide roll 830c performs a gap adjusting function to adjust the thickness of the pattern layer of the coating liquid applied to the reflective polarizer 810, that is, the angled reflective polarizer 812 in which the pattern layer is made of resin. More specifically, when the guide roll 830c is brought into close contact with the master roll 844, the pattern layer of the reflective polarizer can be made thinner. On the contrary, when the guide roll 830c is further separated from the master roll, The pattern layer can be formed thicker. The thickness of the reflective polarizer pattern layer can be controlled by the viscosity of the coating liquid, the patterning speed, and the tension of the reflective polarizer in addition to the interval between the guide roll 830c and the master roll 844.

The coating liquid is injected by the coating liquid injecting means 860 at the point where the guide roll 830c and the master roll 844 are engaged with each other by the reflective polarizer 810 and is pushed into the patterns of the molding die 842, Is uniformly distributed and pattern-formed by the pressure between the guide roll 830c and the master roll 844. [ The coating liquid distributed between the patterns is cured by heat or UV emitted from the curing means 870. The reflection type polarizing element having the patterned coating liquid cured and applied is separated from the molding die 842 while being guided by the guide roll 830d and the reflective polarizing element 812 having the pattern is conveyed by the guide roll 830e, 2 roll 850. As shown in Fig. Here, the guide roll 830d performs a peeling function for separating the reflective polarizer 812 having the coating liquid applied thereto, that is, the pattern layer formed thereon, from the molding die 842.

In the above description, the reflective polarizer 810 and the reflective polarizer 812 having the pattern layer are connected to each other and are classified for ease of explanation. That is, the reflective polarizer 810 refers to a state before a pattern is formed, and the reflective polarizer 812 having the pattern layer formed thereon is coated with the coating liquid, which is patterned while passing through the pattern molding portion 840, And the state is completed. In Fig. 16, only a part of the pattern layer formed on the reflective polarizer 812 on which the pattern layer is formed is shown. In reality, the reflective polarizer wound on the second roll 850 also has a pattern layer formed thereon.

17 is a schematic view of a process of forming a fine pattern according to another preferred embodiment of the present invention. Specifically, the forming mold 942 is formed into a roll type with a length corresponding to the length of the reflective polarizer 910, so that the reflective polarizer 912 on which the pattern layer is formed has no seams.

The second embodiment of the optical member manufacturing apparatus according to the present invention also includes a first roll 920 on which a reflective polarizer 910 is wound and a second roll 950 on which a reflective polarizer 912 with a pattern layer is wound Guide rolls 930a to 930f are provided between the first roll 920 and the second roll 950 for transferring the reflective polarizer having the reflective polarizer and the pattern layer formed on both sides thereof. Between the guide roll 930c and the guide roll 930d, a master roll 946 of the pattern molding portion 940 is closely attached to apply the coating liquid to the reflective polarizer 910. It goes without saying that the number and position of the guide rollers 930a to 930f may be changed according to the operation state. The pattern molding unit 940 includes a film forming mold 942 in which a pattern shape is implemented, a third roll 944 on which a forming mold is wound, a pressing roll 944 for pressing the coating liquid onto the forming mold, A master roll 946 for shaping and applying this to the reflection type polarizer 910, pattern guide rolls 947a to 947d for conveying the forming mold, and a fourth roll 948 for conveying the formed molding mold. It goes without saying that the number and position of the pattern guide rolls 947a to 947d can be changed according to the operation state.

The forming mold 942 is conveyed by the master roll 946 and the guide rolls 947a to 947d while being wound on the third roll 944 in contrast to the embodiment of Fig. 16, and is fed to the reflective polarizer 910 After the pattern of the coating liquid is formed, it is wound on the fourth roll 948. At this time, it is preferable that the forming mold 942 is formed to have the same length as that of the reflection type polarizer 910, and the reflection type polarizer 912 having the pattern layer formed thereon can be provided with the entire area So that the pattern is uniformly formed. Although only a part of the pattern embodied in the pattern layer of the forming mold is shown in FIG. 17, in actual practice, the pattern is implemented over the entire forming mold.

A coating liquid injecting unit 960 for injecting a coating liquid is provided at a point where the reflective polarizer 910 is drawn into the pattern molding unit 940, that is, at a point where the guide roll 930c and the master roll 946 are in close contact with each other A curing unit 970 for curing the coating liquid by irradiating heat or UV is provided at a point where the reflection type polarizer and the forming mold 942 are in close contact with each other.

The multilayer reflective polarizer of the present invention produced by the above-described method has a first layer and a first layer having in-plane birefringence and a second layer having an in-plane birefringence and a second layer alternately stacked in order to transmit the first polarized light irradiated from the outside and reflect the second polarized light. Wherein the first layer and the second layer are different in refractive index in at least one axial direction and the first and second layers are elongated in at least one axial direction, Layer forms one repeating unit, and the repeating units form a group for reflecting a transverse wave (S wave) of a desired wavelength, wherein the number of the groups is two or more, the groups are integrally formed, A core layer having a different average optical thickness; And a structured surface layer formed on at least one side of the core layer.

18 is a cross-sectional view of a multilayer reflective polarizer according to a preferred embodiment of the present invention. Specifically, the core layer 180 is divided into two groups (A, B). In the drawing, a dotted line dividing groups A and B means a virtual line. In the group A, the first layers 181 and 183 corresponding to the first component and the second layers 182 and 184 corresponding to the second component are alternately stacked. Herein, the first layer 181 and the second layer 182 are defined as one repeating unit (R1), and the group A may include at least 25 repeating units. Group B also alternately stacks the first layer (185, 187) and the second layer (182, 184) corresponding to the second component. Herein, the first layer 185 and the second layer 186 are defined as one repeating unit (R2), and the group A includes at least 25 repeating units, preferably 50 or more, more preferably 100 Or more, and most preferably 150 or more. The thicknesses of the first layer and the second layer may be the same.

On the other hand, the average optical thicknesses of the repeating units (R1) included in the group A and the average optical thicknesses of the repeating units (R2) included in the group B are different. This makes it possible to reflect different wavelengths of S waves. In addition, the optical thickness of the repeat units contained in group A may have an optical thickness variation preferably within 20%, more preferably within 15%, based on the average optical thickness of group A. Therefore, when the average optical thickness of the group A is 200 nm, it is possible to reflect a transverse wave (S wave) of a wavelength of 400 nm by the above-mentioned relational expression 2. [ In this case, if the thickness deviation is 20%, the wavelength band of about 320 to 480 nm can be covered. If the average optical thickness of the repeating units (R2) in the group B is 130 nm, the transverse wave (S wave) of 520 nm wavelength can be reflected by the relational expression 1. If the thickness deviation is 20%, the wavelength band of about 420 to 620 nm And in this case can be partially overlapped with the wavelength band of the group A, thereby maximizing the light modulation effect. In addition, since the first layer having the in-plane birefringence must transmit the P wave and reflect the S wave, the refractive index (n) can be set based on the thickness direction (refractive index of the z axis) through which the light passes and the average optical thickness can be calculated.

On the other hand, since the adhesive layer is integrally formed without grouping between the groups, the manufacturing cost can be remarkably reduced and deterioration of the optical properties due to the adhesive layer can be prevented, and more layers can be added to a limited thickness. Can be remarkably improved.

19 is a sectional view of a multilayer reflective polarizer according to another preferred embodiment of the present invention. 14, three groups (A, B, and C) having different average optical thicknesses are formed in the core layer, and the average optical thicknesses of the inter-group repeating units are different from each other.

20 is a cross-sectional view of a multilayer reflective polarizer according to another preferred embodiment of the present invention. Specifically, the core layer is formed of four groups, and each of the groups can be adjusted in the average optical thickness to cover the light wavelength band of 350 nm, 450 nm, 550 nm and 650 nm, respectively. In this case, the outer layer of the core layer is formed with groups having a large average optical thickness, and groups having a small average optical thickness in the inner layer can be formed. On the other hand, in order to cover the entire visible light region, the average optical thickness of the repeating units should be determined so as to correspond to various light wavelengths. To set the average optical thickness of the repeat units per group within the core layer to correspond to the optical wavelength band of 350 nm, 450 nm, 550 nm and 650 nm, the average optical thickness of the first component between the groups may be different by at least 5% , And more preferably 10% or more. This allows reflection of the S wave in the entire visible region.

FIG. 21 is a perspective view of a reflective polarizer having a structured surface layer according to an embodiment of the present invention, in which a core layer in which isotropic layers 210 and anisotropic layers 211 are alternately laminated, and FIG. A primer layer 212 may be selectively formed on one surface of the core layer. This makes it possible to improve the adhesion, appearance and electrophotographic characteristics of the structured surface layer. Examples of the material include, but are not limited to, acrylic, ester, and urethane. The primer layer can be formed thinner than the other layers, and the thickness of the primer layer can be adjusted to improve the light transmittance and reduce the reflectance.

The thickness of the primer layer 212 may be 5 nm to 300 nm. If the thickness of the primer layer is less than 5 nm, the adhesion between the core layer and the structured surface layer may be insufficient. If the thickness of the primer layer exceeds 300 nm, unevenness or molecular aggregation may occur during primer treatment.

Meanwhile, the reflective polarizer of the present invention can maximize the light condensing effect by preventing the diffuse reflection on the surface by forming the structured surface layer 213 on at least one surface, and thus the brightness can be remarkably improved.

The structured surface layer 213 that can be applied in the present invention is a structure capable of improving the light collecting effect, and may be a fine pattern layer. The fine patterns that can be applied in this case may be any one or more selected from the group consisting of prisms, lenticular, microlenses, triangular pyramid, and pyramid patterns, and each of them may be formed by forming a pattern alone or in combination.

21, the lenticular pattern layer 213 is formed on one surface of the reflective polarizer, and the height (a) of the lenticular may be 10 to 50 탆. If the height of the lenticular pattern is less than 10 mu m, it may be difficult to realize the pattern layer. If the height of the lenticular pattern is more than 50 mu m, the brightness may decrease due to an increase in the total reflection amount of light.

The pitch (b) of the lenticular may be 20 to 100 mu m. If the pitch of the lenticular pattern is less than 20 占 퐉, the convergence effect of the lens shape is somewhat deteriorated due to an increase in the valley portion of the film per unit area, and the limitation of the accuracy of shape processing and the pattern shape are too narrow, If the thickness exceeds 100 탆, the possibility of occurrence of moire between the pattern structure and the panel becomes very large.

On the other hand, when the short axis radius of the elliptical cross section is a and the long axis radius is b, the ratio of the major axis / minor axis (b / a) is 1.0 to 3.0 per lenticular lens. If the ratio of the major axis / minor axis (b / a) is out of the above-mentioned range, there may arise a problem that the luminance line concealing efficiency for the light passing through the birefringent polarizing layer is inferior.

Further, in defining the height h of the lenticular lens, the tangent angle alpha at both end points of the lower end of the lens must be between 30 and 80 degrees. At this time, if? Is less than 30 degrees, the luminance line concealment efficiency is lowered, and if it is larger than 80 degrees, there is a problem that lens pattern production becomes difficult. When the cross-sectional shape of the lenticular lens is triangular, it is preferable that the vertex angle &thetas; satisfies 90 to 120 degrees for the hue line concealment effect.

On the other hand, the lenticular shape may be formed as a pattern having the same height and pitch as shown in Fig. 21, or lenticular patterns having different heights and pitch as shown in Fig. 22 may be mixed.

FIG. 23 shows a microlens pattern layer formed on one surface of the reflective polarizer, and the height of the microlenses may be 10 to 50 .mu.m. If the height of the microlens pattern is less than 10 mu m, the light collecting effect is somewhat deteriorated, and the pattern implementation may be difficult. When the height exceeds 50 mu m, the moiré phenomenon tends to occur and the pattern may appear in the image.

Further, the diameter of the microlenses may be 20 to 100 mu m. Preferably 30 to 60 mu m. The light-converging function and the light-diffusing property of the microlens can be excellent while the appearance characteristic is good in the above-mentioned range, and the microlens can be actually manufactured easily. If the diameter of the microlens pattern is less than 20 mu m, there is a problem of low condensing efficiency with respect to the incident light incident at an angle that is not effective. If the diameter exceeds 100 mu m, the condensing efficiency with respect to the vertical light is reduced. May occur.

On the other hand, the microlens pattern layer may be formed in a pattern having the same height and diameter as shown in FIG. 23, or microlens patterns having different heights and diameters as shown in FIG. 24 may be mixed. It is ideal that the microlens pattern increases the density to a maximum and has a degree of impregnation of 1/2 because the optical characteristics vary greatly depending on the density and the aspect ratio of the lens.

In FIG. 25, the prism pattern layer 213 is formed on one surface of the reflective polarizer, and the height (a) of the prism may be 10 to 50 .mu.m. If the height of the prism pattern is less than 10 mu m, the base film may be damaged by pressure when manufacturing the shape of the prism pattern portion. If the height exceeds 50 mu m, the light transmittance of the light incident on the light source may be reduced.

Also, the pitch b of the prism may be 20 to 100 mu m. If the pitch of the prism pattern is less than 20 탆, the embossing is difficult and the complication of the pattern layer implementation and manufacturing process may occur. If the pitch exceeds 100 탆, the moire phenomenon tends to occur, .

On the other hand, the prism shape may be formed as a pattern having the same height and pitch as shown in Fig. 25, or prism patterns having different heights and pitch as shown in Fig. 26 may be mixed. Such a prism pattern may be made of a material having a refractive index higher than that of the base film. If the refractive index of the base film is higher, a part of the light incident on the back surface of the base film may not be incident on the prism structure Because. Preferably, the prism shape is preferably a linear prism shape, the vertical section is triangular, and the triangle has an angle of 60 to 110 degrees with respect to a vertex opposed to the lower surface.

The material of the structured surface layer is preferably a polymer resin including a thermosetting or photocurable acrylic resin or the like. For example, the prism pattern can be an unsaturated fatty acid ester, an aromatic vinyl compound, an unsaturated fatty acid and a derivative thereof, or a vinyl cyanide compound such as methacryl nitrile. Specific examples thereof include uretanic acrylate, methacrylic acrylate Resin or the like can be used. The structured surface layer can also be made of a material having a higher refractive index than the reflective polarizer.

According to a preferred embodiment of the present invention, a birefringence interface may be formed between the first layer and the second layer forming the core layer. Specifically, in the multilayer reflective polarizer in which the first layer and the second layer are alternately laminated, the substantial coincidence or incoincidence of the refractive index along the X, Y and Z axes in the space between the first and second layers is determined by the axis Which affects the degree of scattering of the polarized light beam. Generally, the scattering ability changes in proportion to the square of the refractive index mismatch. Thus, the greater the degree of discrepancy in refractive index along a particular axis, the more scattered light rays are polarized along that axis. Conversely, when the inconsistency along a particular axis is small, the polarized light rays along the axis are scattered to a lesser degree. If the refractive index of the second layer substantially coincides with the refractive index of the first layer along an axis, incident light polarized with an electric field parallel to this axis is not scattered regardless of the size, shape and density of the portion of the first layer Will pass through the first layer. Also, when the refractive index along the axis is substantially coincident, the light rays pass through the object without being substantially scattered. More specifically, the first polarized light (P wave) is transmitted without being influenced by the birefringent interface formed at the boundary between the second layer and the first layer, while the second polarized light (S wave) The light is affected by the birefringent interface formed at the boundary. As a result, the P wave is transmitted and the S wave is modulated by light such as scattering and reflection of light, resulting in separation of polarized light.

Therefore, the first layer and the second layer may form a birefringence interface at the cemented surface to cause a light modulation effect. Therefore, when the second layer is optically isotropic, the first layer may have birefringence. Specifically, when the refractive index in the x-axis direction is nX1, the refractive index in the y-axis direction is nY1, the refractive index in the z-axis direction is nZ1, and the refractive indexes of the second layer are nX2, nY2 and nZ2, Plane birefringence may occur. More preferably, the first layer and the second layer may differ in at least one of X, Y, and Z-axis refractive indexes, and more preferably, when the extension axis is the X-axis, Is 0.05 or less, and the difference in refractive index with respect to the X-axis can be 0.1 or more. On the other hand, when the difference in the refractive index is 0.05 or less, it is interpreted as matching.

Meanwhile, according to a preferred embodiment of the present invention, the total number of layers of the multilayer reflective polarizer may be 100 to 2000. The thickness range of the repeating unit can be appropriately designed according to the wavelength range of the desired light and the refractive index, and may preferably be 65 to 300 nm. The thicknesses of the first layer and the second layer forming the repeating unit may be the same or different. In the present invention, the thickness of the core layer may be 10 to 300 탆.

According to another preferred embodiment of the present invention, there is provided an apparatus for producing a multilayer reflective polarizer in which a first component and a second component comprise alternately laminated core layers, wherein the first component and the second component are separately introduced Two or more extruding portions; Layered composite streams in which the repeating units of the first component and the second component are alternately stacked, and each of the multi-layer composite streams includes a plurality of multi- A spin block including a composite extrusion nozzle for injecting a first component and a second component to produce two or more multi-layer composite streams having different average optical thicknesses of the repeating units; A collection block for forming a core layer by laminating two or more multi-layer composite streams transferred from the spin block part; And a flow control unit for guiding the spread of the core layer transferred in the collection block unit.

27 is a schematic view of an apparatus for producing a multilayer reflective polarizer in which a core layer is integrally formed according to a preferred embodiment of the present invention. And includes a first extrusion part 220 into which the first component is injected and a second extrusion part 221 into which the second component is injected. The first extrusion part 220 is connected to the spin block part C including the four slit type extrusion tools 223, 224, 225 and 226. At this time, the first extruding unit 220 supplies the first component to the four slit-type extrusion seats 223, 224, 225, and 226 in a molten state. The second extruded portion 221 is also connected to the spin block portion C and supplies the second component to the four slit-shaped extrusion orifices 223, 224, 225, and 226 contained therein in a molten state. The four components of the multi-layer composite stream are alternately stacked with the first component and the second component through the four slit-type extrusion ports 223, 224, 225, and 226, and the average optical thicknesses of the repeating units are different. For this purpose, the respective slit diameters of the four slit-shaped extrusion ports may be different. The four slit-type pushing-in prongs 223, 224, 225, and 226 may be the slit-type pushing-out prongs shown in FIG. In addition, although four slit-type extrusion / detachment mechanisms have been described as an example, it is also within the scope of the present invention that a single slit-type extrusion / detachment mechanism can be used. The four multi-layer composite streams produced through the four slit-shaped extrusion ports 223, 224, 225 and 226 are joined together in the collection block section 227 to form one core layer. In this case, the collection block portion 227 may be formed separately or may be combined with the multi-layer composite streams in the form of a bundle of nuts in the slit-type extrusion slot when a single slit-type extrusion slot is used. The core layer laminated in the collection block section 227 is transferred to the flow control section 229 and the spread of the first component is induced. Preferably, the flow control may be a T-die or a coat-hanger die.

28 is a schematic view of an apparatus for manufacturing a multilayer reflective polarizer according to another preferred embodiment of the present invention. 27, the first extruding unit 220 feeds the first component to the four first pressing units 233, 234, 235, and 236. The first pressurizing means 233, 234, 235 and 236 have different discharge amounts and discharge the first component into the plurality of slit-shaped extrusion ports 241, 242, 243 and 244. The second extruding portion 221 feeds the second component to the four second pressing means 237, 238, 239, 240. The second pressurizing means 237, 238, 239 and 240 have discharge amounts different from each other and discharge the second component to the plurality of slit-shaped extrusion ports 241, 242, 243 and 244. Four multi-layer composite streams having different average optical thicknesses are produced through four slit-type extrusion ports 241, 242, 243, and 244. The first pushing means, the second pushing means, and the plurality of slit-shaped pushing-out portions form a spin block portion (C).

29 is a schematic view of an apparatus for manufacturing a multilayer reflective polarizer according to another preferred embodiment of the present invention. 18, the present invention is characterized in that, in order to manufacture a multilayer reflective polarizer having four groups, eight slit-type extrusion / detaching units are used instead of four slit-type extrusion / detaching units, and multi-stage laminating is performed . Specifically, the first pressing means 233 discharges the first component to the two slit-shaped pushing-out portions 250, 251. The second pressing means 234 also discharges the first component to the two slit-shaped pushing-out portions 250, 251. The two slit-shaped extrusion ports 250 and 251 have the same average optical thickness between the multilayer composite streams since the first component and the second component are transported through the same first pressing means and second pressing means. In this way, eight multi-layer composite streams are formed and the two multi-layer composite streams have the same average optical thickness. The two multilayer composite streams having the same average optical thickness are laminated in the first leg portions 258, 259, 260, and 261 to form four multi-layer composite streams, respectively, and the four multi- ) To form one core layer.

On the other hand, in Fig. 29, although it has been described that one first pressing means transfers the first component to two slit-type extrusion seals, it is possible to transfer the first component to two or more slit- And this can be equally applied to the second pressing means.

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.

≪ Example 1 >

The process was performed as shown in FIG. Specifically, a mixture of PEN having a refractive index of 1.65 as a first component and dimethyl terephthalate and dimethyl-2,6-naphthalene dicarboxylate as a second component in a molar ratio of 6: 4 was mixed with ethylene glycol (EG) and 1 : 2 molar ratio of co-PEN having a refractive index of 1.64 were charged into the first extruder and the second extruder, respectively. The extrusion temperature of the first component and the second component was 295 캜, and Cap. The polymer flow was calibrated through adjustment and the skin layer was subjected to an extrusion process at a temperature level of 280 占 폚.

Four composite flow types having different average optical thicknesses were prepared by using four slit-type extrusion nozzles of Figs. Specifically, the first component transferred from the first extruder is distributed to the four slit-type extrusion drills, and the second component transferred from the second extruder is transferred to the four slit-type extrusion drills. One slit-type extrusion slot is composed of 300 layers. The thickness of the slit of the first slit-type extrusion slot on the bottom surface of the fifth slotted distribution plate in Fig. 7 is 0.26 mm, the slit thickness of the second slit- , The slit thickness of the third slit-type extrusion nozzle was 0.17 mm, the slit thickness of the fourth slit-type extrusion nozzle was 0.30 mm, and the diameter of the discharge port of the sixth nozzle distribution plate was 15 mm 15 mm. Four composite streams discharged through the four slit-type extrusion ports were transported through a separate flow path and then lapped in a collection block to form one core layer polymer. The spread of the core layer polymer was induced in the coat hanger die of Figs. 12 and 13, which corrected the flow rate and pressure gradient. Specifically, the width of the die inlet is 200 mm, the thickness is 10 mm, the width of the die outlet is 960 mm, the thickness is 0.78 mm, and the flow rate is 1 m / min. Then, a smoothing process was performed on the cooling and casting rolls and stretched 6 times in the MD direction. Next, thermal fixation was carried out through an IR heater at 180 ° C for 2 minutes to produce a multilayer reflective polarizer shown in FIG. The refractive index (nx: 1.88, ny: 1.64, nz: 1.64) of the first component of the produced reflective polarizer was 1.64 and the refractive index of the second component was 1.64. The A group had 300 layers (150 repetition units), the thickness of the repeating unit was 168 nm, the average optical thickness was 275.5 nm, and the optical thickness variation was about 20%. The B group had 300 layers (150 repetition units), the thickness of the repeating unit was 138 nm, the average optical thickness was 226.3 nm, and the optical thickness variation was about 20%. The C group had 300 layers (150 repetition units), the thickness of the repeating unit was 110 nm, the average optical thickness was 180.4 nm, and the optical thickness variation was about 20%. The D group had 300 layers (150 repetition units), the thickness of the repeating unit was 200 nm, the average optical thickness was 328 nm, and the optical thickness variation was about 20%. The thickness of the core layer of the manufactured multilayer reflective polarizer is 92.4 탆.

Thereafter, the produced reflective polarizer was subjected to the same process as shown in FIG. 16 to prepare a reflective polarizer having a urethane acrylic lenticular pattern layer having a refractive index of 1.59. The height in the lenticular pattern was 25 mu m and the pitch was 50 mu m.

≪ Example 2 >

A reflective polarizer was produced in the same manner as in Example 1, except that a reflective polarizer having a microlens pattern layer having a height of 30 탆 and a diameter of 60 탆 was formed instead of a lenticular pattern layer.

≪ Example 3 >

A reflective polarizer was produced in the same manner as in Example 1, except that a reflective polarizer having a prism pattern layer having a height of 12 탆 and a pitch of 24 탆 was formed instead of the microlens pattern layer.

≪ Comparative Example 1 &

A reflective polarizer was produced in the same manner as in Example 1, except that a lenticular pattern layer (having the same height and pitch) was formed in a straight-line pattern in the drawing step.

≪ Comparative Example 2 &

A reflective polarizer was produced in the same manner as in Example 1 except that the height of the lenticular pattern was 55 mu m and the pitch was 110 mu m.

≪ Comparative Example 3 &

A reflective polarizer was produced in the same manner as in Example 1 except that the microlens had a height of 55 탆 and a diameter of 110 탆.

≪ Comparative Example 4 &

A reflective polarizer was produced in the same manner as in Example 1 except that the height of the prism was 55 μm and the pitch was 110 μm.

<Experimental Example>

The following properties of the reflective polarizer prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were evaluated, and the results are shown in Table 1.

1. Relative luminance

In order to measure the brightness of the produced reflective polarizer, the following procedure was performed. The panel was assembled on a 32 "direct-type backlight unit equipped with a diffuser plate and a reflective polarizer, and the brightness was measured at nine points using a BM-7 meter of Topcon Co. The average value was shown.

The relative luminance is a relative value of the luminance of the other Embodiment 2, Embodiment 3 and Comparative Examples 1 to 4 when the luminance of the reflection type polarizer of Embodiment 1 is taken as 100 (reference).

2. Moire

The moire phenomenon of the produced reflective polarizer was laminated on a prism sheet of a backlight unit in which a light source, a diffuser plate and a prism sheet were laminated in order, and then the degree of occurrence of a moire phenomenon caused by the prism sheet was visually judged Respectively.

Relative luminance (%) Moire Example 1 100 none Example 2 97.1 none Example 3 104.6 none Comparative Example 1 72.2 none Comparative Example 2 99.6 Occur Comparative Example 3 96.2 Occur Comparative Example 4 104.1 Occur

As can be seen from Table 1, the reflection type polarizers of Examples 1 to 3 of the present invention have improved optical properties due to an increase in the amount of vertical output light and an efficiency of light collection compared with the reflection type polarizers of Comparative Examples 1 to 4 , It can be confirmed that excellent image quality can be realized due to excellent moiré prevention effect.

Since the reflective polarizer of the present invention has excellent light modulation performance, it can be widely used in fields where optical modulation is required. Specifically, it can be widely used in flat panel display technologies such as a liquid crystal display device, a projection display, a plasma display, a field emission display, and an electroluminescence display which require high brightness such as a mobile display, an LCD and an LED.

Claims (18)

A method for producing a multilayer reflective polarizer in which a first component and a second component comprise alternating layers of a core,
(1) supplying a first component and a second component to the extruding portions, respectively;
(2) repeating units of the first component and the second component form two or more multi-layered composite streams alternately stacked, and each of the multi-layer composite streams has a plurality of multi- Into the plurality of slit-type extrusion ports to transfer two or more multi-layer composite streams having different average optical thicknesses of the repeating units ;
(3) combining the two or more multilayer composite streams to form a core layer;
(4) inducing the core layer to spread in a flow control section;
(5) stretching the core layer; And
(6) forming a structured surface layer on at least one side of the stretched core layer. The method of claim 1, wherein the flow control is a T-die or a coat-hanger die. The method according to claim 1,
Further comprising forming a primer layer on at least one side of the core layer between steps (5) and (6). The method according to claim 1,
Wherein the structured surface layer is a fine patterned layer. 5. The method of claim 4,
Wherein the fine pattern is at least one selected from the group consisting of a prism, a lenticular, a micro lens, a triangular pyramid, and a pyramid pattern. The method according to claim 1 or 3,
Wherein the step (6) is performed through a pattern-forming mold film. 7. The method of claim 6, wherein step (6)
a) transferring the core layer;
b) transferring the mold film for pattern formation formed on one surface of the reversed phase pattern of the structured surface layer;
c) bringing the one side of the core layer and the one side of the pattern-forming mold film into contact with each other;
d) injecting a fluid material into a region where the core layer and the mold film for pattern formation are in close contact with each other to fill the spaces between the patterns;
e) applying the material to the core layer by curing the material filled between the patterns; And
f) separating the mold film for pattern formation and the core layer coated with the material,
Wherein the steps a) and b) are performed independently of the order. 8. The method of claim 7,
Between step d) and step e)
Further comprising the step of applying pressure to the core layer and the mold film in close contact to fill the material evenly between the patterns. 8. The method of claim 7,
Wherein the step e) comprises irradiating heat or UV to the material filled between the patterns. 7. The method of claim 6, wherein step (6)
I) The core layer is closely contacted to a master roll formed on one side of the reversed phase pattern of the structured surface layer, and the melted polymer resin is applied to the pattern side or the core side of the master roll; And
Ii) UV-curing the polymer resin by irradiating UV or heat while the polymer resin is press-formed on the pattern surface of the master roll, and separating the polymer resin. 11. The method of claim 10,
Curing the polymer resin by irradiating UV or heat again after the step ii); / RTI &gt; of claim &lt; / RTI &gt; A first layer having an in-plane birefringence and a second layer alternately stacked with the first layer so as to transmit the externally irradiated first polarized light and reflect the second polarized light, wherein the first and second layers comprise at least The first layer and the second layer being elongated in at least one axial direction, the first and second layers forming one repeating unit, the repeating units having a desired wavelength (S wave) of the inter-group repeating units, wherein the groups are two or more, the groups are integrally formed, and the inter-group repeating units have different average optical thicknesses; And
And a structured surface layer formed on at least one side of the core layer. 13. The method of claim 12,
Further comprising a primer layer for enhancing adhesion between the core layer and the structured surface layer. The method according to claim 12 or 13,
Wherein the structured surface layer is a micropatterned layer. 15. The method of claim 14,
Wherein the fine pattern is at least one selected from the group consisting of a prism, a lenticular, a microlens, a triangular pyramid, and a pyramid pattern. 16. The method of claim 15,
Wherein the prism pattern has a height of 10 to 50 占 퐉 and a pitch of 20 to 100 占 퐉. 16. The method of claim 15,
Wherein the microlens pattern has a height of 10 to 50 占 퐉 and a lens diameter of 20 to 100 占 퐉. 16. The method of claim 15,
Wherein the lenticular pattern has a height of 10 to 50 占 퐉 and a pitch of 20 to 100 占 퐉.

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