TWI509298B - Method and apparatus for manufacturing multilayer reflective polarizer - Google Patents

Description

Method and apparatus for manufacturing multilayer reflective polarizer Technical field

The present invention relates to a method and apparatus for fabricating a multilayer reflective polarizer, and more particularly to a method and apparatus for fabricating a multilayer reflective polarizer, the multilayer reflective polarizer comprising different averages A core layer of a plurality of layers of optical thickness, and a surface layer formed integrally with the core layer, and no adhesive layer is formed between adjacent layer groups of the layer groups.

Background technique

Flat panel display technology covers a major part of the television (TV) market, including liquid crystal displays (LCDs), projection displays, and plasma display panels (PDPs). Field emission displays (FEDs) and electroluminescent displays (ELDs) are also expected to gain a foothold in the market due to their advantageous characteristics and related technological improvements. The application range of the liquid crystal display is currently extended to notebook computers, personal computer screens, LCD TVs, vehicles, aircraft and the like. Liquid crystal displays account for about 80% of the flat panel display market and with the rapid increase in demand, global sales are currently very large.

In a conventional liquid crystal display, a liquid crystal and an electrode substrate are provided. Placed between a pair of light absorbing optical films. In the liquid crystal display, since an electric field is generated by a voltage applied between two electrodes, the liquid crystal changes their orientation, thus changing its optical properties. This program produces a "pixel" containing information to display an image using polarized light in a particular orientation. To this end, the liquid crystal display includes a front optical film and a rear optical film to generate polarized light.

The optical film used in the liquid crystal display does not effectively utilize light emitted by a backlight. This is because at least 50% of the light emitted by the backlight is absorbed by a rear side optical film (a light absorbing polarizing film). Therefore, in the liquid crystal display, a reflective polarizing plate is disposed between an optical resonant cavity and a liquid crystal assembly to enhance the efficiency of using light emitted by the backlight.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the optical principle of a conventional reflective polarizing plate. In detail, the P-polarized component of the light guided to the liquid crystal assembly by the optical cavity is transmitted to the liquid crystal assembly after passing through the reflective polarizing plate. On the other hand, the S-polarized component of the light is reflected by the reflective polarizing plate toward the optical resonant cavity, and then reflected by the diffuse reflective surface of one of the optical resonant cavity such that the polarization direction thereof is random and, therefore, the S-polarized light Then, it is projected on the reflective polarizing plate. Finally, the S-polarized light is converted into P-polarized light that can pass through the polarizing plate of the liquid crystal assembly. Therefore, after passing through the reflective polarizing plate, the converted P-polarized light is transmitted to the liquid crystal assembly.

The function of the reflective polarizer for incident light, that is, selectively reflecting S-polarized light and transmitted P-polarized light, can be achieved according to a refractive index between two different flat optical layers, and the flat optical layers are at the same Flat optical layer The reflective polarizing plates which are alternately stacked have an anisotropic refractive index and an isotropic refractive index, respectively, an optical thickness of each of the optical layers obtained after stretching of the optical layer, and the optical of the stretching The change in the refractive index of the layer.

That is, the light projected on the reflective polarizing plate repeatedly performs S-polarized reflection and P-polarized light transmission when applied to the respective optical layers, and therefore, only the P-polarized component of the projected polarized light is transmitted to the total of the liquid crystal. to make. On the other hand, the reflected S-polarized light is reflected by the diffuse reflection surface of the optical resonant cavity in a state of random polarization and then transmitted to the reflective polarizing plate. This reduces the loss of light generated by a light source and the waste of electricity.

However, a problem with the above-mentioned conventional reflective polarizing plate is that the reflective polarizing plate forms a multilayer structure by alternately stacking a flat isotropic optical layer and a flat anisotropic optical layer having different refractive indices, and pulling Extending the multilayer structure such that the optical thickness and refractive index of each optical layer are optimal for selective reflection or transmission of incident light, the fabrication process of the conventional reflective polarizer is complicated. In particular, since each optical layer of the reflective polarizer has a flat structure, the number of stacked optical layers may be excessive for separating P-polarized light and S-polarized light within a large incident angle range of incident light. In this case, the manufacturing cost will increase exponentially. In addition, the problem of an excessive number of stacked optical layers is that there is a loss of light that causes a drop in optical performance.

2 is a cross-sectional view showing a conventional multilayer reflective polarizing plate (for example, a dual brightness enhancement film (DBEF)). In detail, the multilayer reflective polarizing plate includes a core layer 8 and surface layers 9 and 10 formed on the opposite faces of the core layer 8. The core layer 8 is divided into four layers 1, 2, 3 and 4. Layer Groups 1, 2, 3, and 4 have a multi-layered structure in which an isotropic layer and an anisotropic layer are alternately stacked. Each layer group 1, 2, 3 and 4 comprises approximately 200 layers. At the same time, the separate adhesive layers 5, 6 and 7 are formed such that the adhesive layers 5, 6 and 7 are disposed between adjacent ones of the four layer groups 1, 2, 3 and 4 forming the core layer 8. When the layer groups 1, 2, 3 and 4 are independently extruded, since each of the layer groups 1, 2, 3 and 4 has only about 200 layers, it has a very small thickness, so that they may be destroyed. To this end, each layer group 1, 2, 3 and 4 may comprise a protective boundary layer (PBL). However, in this case, there is a problem that the thickness of the core layer is increased and the manufacturing cost is increased. Further, in the case where a reflective polarizing plate is included in a display panel, the thickness of a core layer is limited to be thinned. When the adhesive layer is formed between the core layer and/or the surface layer in the reflective polarizing plate, there may be a problem that the reflective polarized light is reduced due to the thickness of the core layer caused by the provision of the adhesive layers. The optical properties of the board may deteriorate. Since the adjacent layers of the core layer are coupled by the adhesive layers, and the core layer and the surface layers are coupled by the corresponding adhesive layer, there may be a problem that the peeling phenomenon between the layers may be subjected to an external force on the reflective polarizing plate. It may occur after being used or stored for a period of time, or after the reflective polarizer is stored in an unfavorable environment. In addition, the failure rate in the procedure of attaching the adhesive layer is too high. Moreover, it is possible that the reflective polarizing plate is offset from a light source by the formation of the adhesive layers.

As described above, the surface layers 9 and 10 are formed on the opposite surfaces of the core layer 8, respectively. In order to couple the surface layers 9 and 10, separate adhesive layers 11 and 12 are formed between the core layer 8 and the surface layer 9, respectively, and between the core layer 8 and the surface layer 10. When made of a polycarbonate material The surface layer is combined with a plurality of layers of polyethylene 2,6 naphthalate (PEN) and a plurality of copolymerized ethylene 2,6 naphthalate (coPEN) layers which are alternately stacked by means of squeezing. When integrated, peeling occurs due to lack of compatibility between the surface layers and the core layer. Moreover, it is highly probable that after a stretching process, birefringence will occur with respect to a stretching axis due to about 15% crystallinity. Therefore, for the application of a non-stretched polycarbonate sheet, an adhesive layer must be formed. In this case, there is a case where the yield is reduced due to inclusion of foreign matter and processing defects caused by the addition of an adhesive layer forming procedure. Generally, when a non-stretched polycarbonate sheet is produced for the surface layers, birefringence is caused by uneven shear pressure in a winding process. In order to avoid this problem, different controls such as changing the molecular structure of the polymer or controlling the speed of an extrusion line must be implemented. Therefore, the yield is lowered.

A method for manufacturing the above-described conventional multilayer reflective polarizing plate will be briefly described below. The core layer is formed by independently co-extruding a four-layer group having different average optical thicknesses to form the core layer, stretching the co-extruded four-layer group, and then bonding the stretched four-layer group with an adhesive. Manufacturing. The reason why the bonding is performed after the stretching is that if the core layer is stretched after being bonded by the adhesive, a peeling phenomenon occurs. Then, the surface layers are respectively bonded to the opposite surfaces of the core layer. For example, in the case of forming a multilayer structure of each layer group, a two-layer structure is folded to form a four-layer structure, and the folding is continued to form a multilayer structure having a desired number of layers (for example, 209 layers). The multilayer layer stack is then coextruded. Due to this procedure, it is impossible to change the thickness of each layer group. Therefore, in a single program in a multi-layer structure It is difficult to form a majority layer. Thus, in the conventional case, four layers of different average optical thicknesses are extruded independently and then bonded together.

Since the above-described programs are intermittently implemented, a large increase in manufacturing costs occurs. Therefore, the reflective polarizing plate is the most expensive in an optical film contained in a backlight unit. Therefore, in some cases, although a case where the brightness is lowered, a liquid crystal display having no reflective polarizing plate is manufactured to reduce the manufacturing cost. This can be a serious problem as the manufacturing of the product increases.

To this end, a multilayer reflective polarizer has been proposed. Unlike the multilayer reflective polarizing plate, in the multilayer reflective polarizing plate, a plurality of longitudinally stretched birefringent polymers are disposed in a matrix to obtain a reflective polarizing plate function. 3 is a perspective view of a reflective polarizing plate 20 including one of a plurality of rod-shaped polymers. Most of the longitudinally stretched birefringent polymers 22 are disposed in a matrix 21 such that they extend in one direction. In the reflective polarizing plate 20, an optical modulation effect is produced by a birefringent interface between the substrate 21 and each of the birefringent polymers 22. Therefore, the reflective polarizing plate 20 can perform a function of a reflective polarizing plate. However, in the reflective polarizing plate 20, there is a problem in that it is difficult to reflect light in all wavelength ranges of visible light, and thus an excessively low optical modulation efficiency is generated as compared with the above-described alternately stacked reflective polarizing plates. Of course, although this method has a problem of an excessive number of such birefringent polymers 22, by increasing the number of birefringent polymers 22 in the matrix 21, transmission similar to that of the alternately stacked reflective polarizers can be obtained. Transmittance and reflectivity of rate and reflectivity. In detail, when manufacturing a display panel having a horizontal length of 32 inches, Based on the vertical cross section of a reflective polarizer, one having a diameter of 0.1 to 0.3 μm and at least one million circular or elliptical birefringent polymer 22 should be included in a horizontal length of one, 1,580 mm and one equal to Or a substrate 21 having a height (thickness) of less than 400 μm so that the reflective polarizing plate has optical properties similar to those of the above-described alternately stacked reflective polarizing plates. In this case, the manufacturing cost is excessively increased. In addition, the equipment used to manufacture the reflective polarizer is very complicated. Therefore, it is not impossible to manufacture the device, and therefore, it is difficult to commercialize the reflective polarizing plate. Moreover, it is also difficult for the birefringent polymers 22 included in the matrix to have various optical thicknesses. Therefore, it is difficult to achieve light reflection in all wavelength ranges of visible light, and thus physical properties are deteriorated.

In order to solve the above problems, many birefringent sea-island yarns disposed in a matrix have been proposed. Figure 4 is a number of birefringent sea-island yarns disposed in a matrix. When the sea-island yarn is used, an optical modulation effect may be produced at the optical modulation interface between most islands and sea components. In this case, therefore, the desired optical properties can be obtained without the majority of sea-island yarns being disposed, unlike in the case of using a birefringent polymer. However, since the birefringent sea-island yarn is a fiber, there is compatibility between the birefringent sea-island yarn and a matrix of the polymer, adhesion of the birefringent sea-island yarn to the substrate, and Various problems in the treatment of birefringent sea-island yarns. Further, since the birefringent sea-island yarn has a circular shape, light scattering occurs, thereby reducing the efficiency of reflection and polarization in the wavelength range of visible light. Therefore, deterioration of polarization characteristics occurs in comparison with existing products. Therefore, there is a limit to enhancing brightness. In addition, in the above-mentioned sea-island yarn, the aggregation of most island components is reduced. Under the conditions, the area of the sea component is subdivided. Therefore, many voids causing light leakage, that is, light loss, are formed, thus causing deterioration of optical characteristics. Further, since the sea-island yarn has a woven structure, there is a limitation in forming a multilayer structure. Therefore, there is a limit to enhancing reflection and polarization characteristics.

Summary of the invention

Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a method and apparatus for manufacturing a multilayer reflective polarizing plate comprising a plurality of layer groups including different average optical thicknesses. a core layer and a surface layer formed simultaneously with the formation of the core layer.

According to an aspect of the present invention, the above and other objects are achieved by providing a method for manufacturing a multilayer reflective polarizing plate, and the multilayer reflective polarizing plate comprises a core layer including a first group alternately stacked And the second component, in addition, the manufacturing method comprises the steps of: (1) supplying a first component material and a second component material to each of the extrusion units; (2) delivering the extrusion unit by the extrusion unit The first and second component materials are injected into the plurality of slit-type extrusion dies, thereby forming two or more multilayer composites each including a plurality of overlapping layer units of the first and second components alternately stacked, and Each of the overlapping layer units includes a first component and a second component, and the two or more multilayer composites are different in terms of an average optical thickness of the plurality of overlapping layer units, respectively Reflecting most transverse waves with different wavelengths (S (3) laminating the two or more multilayer composites to form a core layer; and (4) expanding the core layer through a flow control unit.

The method may further comprise, between the step (3) and the step (4), when the surface layer material is sent out by the extrusion unit supplied to the surface layer material in the step (1), at the step ( 3) a step of laminating the surface layer material on at least one surface of the formed core layer.

The method may further include laminating the surface layer material on at least one surface of the core layer in the step (3) when the surface layer material is fed by one of the surface layer materials supplied in the step (1). A step of.

According to another aspect of the present invention, an apparatus for manufacturing a multilayer reflective polarizing plate is provided, and the multilayer reflective polarizing plate comprises a core layer having one of a first component and a second component alternately stacked, and further, the device The method comprises: two or more extrusion units, and one of the first component materials and one of the second components are respectively supplied to the two or more extrusion units; a rotating block, including a majority a slit type squeezing for accommodating a first component material sent from a corresponding one of the pressing units and a second component material sent from a corresponding one of the pressing units Stamping, thus forming two or more multilayer composites of a plurality of overlapping layer units of each of the first and second components, and having different averages of the overlapping layers of the multilayer composites Optical thickness, in order to reflect a majority of the transverse wave (S wave) of the desired wavelength; a collecting block for laminating the two or more multilayer composites sent out by the rotating block, thereby forming the core layer; and a flow control Unit to expand by Feeding agglomerates of the core layer.

The device further comprises: an extrusion unit, and a surface layer material Provided separately to the extrusion unit; and a feed block in communication with the extrusion unit supplied to the surface layer material for at least one surface of a structure comprising one of the multilayer composites fed by the rotary block Laminating a surface layer.

Alternatively, the apparatus may further comprise a pressing unit, and a surface layer material is separately supplied to the pressing unit. The extrusion die can be in communication with the collection block to laminate a surface layer on at least one surface of the core layer.

The rotating block may include: a first pressing unit for supplying a first component material sent from the pressing unit supplied with the first component material to one of the slit type extrusion dies a slit type extrusion die; and a second pressurizing unit for supplying a second component material sent from the extrusion unit supplied by the second component material to one of the slit type extrusion dies Slot type extrusion die.

According to the manufacturing method of the present invention, a plurality of multilayer composite systems having different average optical thicknesses are produced through a plurality of slit-type extrusion dies, and then laminated in a molten state. Therefore, it is not necessary to provide another adhesive layer and/or a protective boundary layer (PBL) in the core layer. Further, since the surface layer is formed on at least one surface of one of the core layers in a molten state, the surface layer is not subjected to another bonding process. Therefore, the manufacturing cost can be significantly reduced. Also, there is a great advantage in maximizing optical properties in a finite thickness.

1,2,3,4‧‧ ‧ layer group

5,6,7‧‧‧Adhesive layer

8‧‧‧ core layer

9,10‧‧‧ surface layer

11,12‧‧‧Adhesive layer

20‧‧‧Reflective polarizer

21‧‧‧Material

22‧‧‧Birefringent polymer

50,52,53,60,61,62,63,67,68,69,70‧‧‧first component supply channel

51,54,55,56,57,58,59,64,65,66,71,72,73‧‧‧second component supply channel

74‧‧‧First Passage

75‧‧‧second channel

76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93‧‧

94‧‧‧Export

100,102‧‧‧First component

101,103‧‧‧ second component

130,131‧‧‧First pressurizing unit

132,133‧‧‧Slit extrusion die

140,141‧‧‧Second pressurizing unit

142,143‧‧‧Slit extrusion die

161,162,163,164‧‧‧Multilayer complex

165‧‧‧ core layer

180‧‧‧ core layer

181,183,185,187‧‧‧ first floor

182,184,186,188‧‧‧ second floor

189,190‧‧‧ surface layer

220‧‧‧First extrusion unit

221‧‧‧Second extrusion unit

222‧‧‧ Third extrusion unit

223,224,225,226‧‧‧Slit extrusion die

227‧‧‧Collection block

228‧‧‧feed block

229‧‧‧Flow Control Unit

233,234,235,236‧‧‧First pressurizing unit

237,238,239,240‧‧‧second pressurizing unit

241,242,243,244‧‧‧Slit extrusion die

245‧‧‧ polarized light absorbing film

250,251‧‧‧Slit extrusion die

258, 259, 260, 261 ‧ ‧ first laminated unit

262‧‧‧Second layered unit

270‧‧‧Frame

280‧‧‧reflector

290‧‧‧Cold Cathode Fluorescent Lamp

300‧‧‧Mold frame

310‧‧‧LCD panel

320‧‧‧Optical film

321‧‧‧Diffuser

322‧‧‧Light diffusing film

323‧‧‧稜鏡film

324‧‧‧Reflective polarizer

325‧‧‧ polarized light absorbing film

A, B, C, D‧‧‧ layer

C‧‧‧ rotating block

R1, R2‧‧‧ resurfacing unit

S1‧‧‧ first distribution board

S2‧‧‧Second distribution board

S3‧‧‧ third distribution board

S4‧‧‧ fourth distribution board

S5‧‧‧ fifth distribution board

S6‧‧‧ sixth distribution board

T1-T6‧‧‧ distribution board

The above and other objects, features and other advantages of the present invention will become more apparent from 2 is a cross-sectional view showing a conventional multilayer reflective polarizing plate (for example, a double brightness enhancement film (DBFE)); FIG. 3 is a perspective view of a reflective polarizing plate including a rod-shaped polymer; A cross-sectional view of a path of movement of light on a birefringent sea-island yarn used in a reflective polarizing plate; and FIG. 5 is a perspective view showing a distribution plate of a slit type extrusion die which can be used in the present invention; 3 is a perspective view showing a coupled state of a slit type extrusion die shown in FIG. 5; and FIG. 8 is a cross-sectional view showing a multilayer composite body according to a preferred embodiment of the present invention; Figure 9 is a schematic view showing two first pressurizing units for forming a two-layer composite according to a preferred embodiment of the present invention; Figure 10 is a view showing the formation of two layers in accordance with a preferred embodiment of the present invention. 2 is a schematic view showing two first pressurizing units of a composite; FIG. 11 is a schematic view showing a laminated unit for laminating a multilayer composite and a surface layer according to a preferred embodiment of the present invention; FIG. 12 is a view showing a laminate according to the present invention; A cross-sectional view of a hanger mold of a preferred embodiment; Figure 13 The side view corresponding to FIG. 15; FIG. 14 is a cross-sectional view of one embodiment of a multilayer based reflective polarizer of a preferred embodiment of the present invention; FIG. 15 is one embodiment according to the present invention, a further preferred embodiment of the multilayer reflective polarizer Figure 16 is a cross-sectional view of a multilayer reflective polarizer in accordance with another preferred embodiment of the present invention; and Figure 17 is a perspective view of a multilayer reflective polarizer in accordance with a preferred embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 18 is a schematic view of an apparatus for manufacturing a multilayer reflective polarizing plate according to another preferred embodiment of the present invention; FIG. 19 is a view of another preferred embodiment of the present invention. A schematic view of a device for manufacturing a multilayer reflective polarizing plate; and FIG. 20 is an exploded perspective view showing a liquid crystal display (LCD) device using the reflective polarizing plate of the present invention.

Best mode

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

According to a preferred embodiment of the present invention, a method for manufacturing a multilayer reflective polarizing plate is provided, and the multilayer reflective polarizing plate includes a core layer including a first component and a second stacked alternately Component. The manufacturing method comprises the steps of: (1) supplying a first component material and a second component material to respective extrusion units; (2) feeding the first and second components by the extrusion units The material is injected into the plurality of slit-type extrusion dies, thereby forming two or more multilayer composites each including a plurality of overlapping layer units of the first and second components alternately stacked, and each of the repeated layer units includes a first a component and a second component, and the two or more multilayer composites are different in terms of an average optical thickness of one of the repeating layer units, Reflecting a plurality of transverse waves (S waves) having different wavelengths respectively; (3) laminating the two or more multilayer composites to form a core layer; and (4) expanding the core layer through a flow control unit.

According to a preferred embodiment of the present invention, the manufacturing method may further include between the step 3 and the step 4, when the surface layer material is fed by one of the surface layer materials supplied by the extrusion unit at the step 1. And the step of laminating the surface layer material on at least one surface of the core layer formed in the step 3.

According to another preferred embodiment of the present invention, the manufacturing method may further include, when the surface layer material is fed by one of the surface layer materials supplied in the step 1, the step 3 is in the core layer. The step of laminating the surface layer material on at least one surface.

According to this method, first, in step 1, one of the first component materials, one of the second component materials, and one of the surface layers is supplied to each of the extrusion units. When the reflective polarizer includes only the core layer, the surface layer material may be omitted. The material of the first component is one of the second components to be dispersed in a matrix which will form a matrix. As the polymer material, a polymer material which can be used in a general polymer-dispersed reflective polarizing plate can be used without limitation. Preferably, the polymer material may be polyethylene 2,6 naphthalate (PEN), copolymerized 2,6 naphthalate (co-PEN), polyethylene terephthalate (PET) ), polycarbonate (PC), polycarbonate (PC) alloy, polystyrene (PS), heat-resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene (ABS), polyurethane (PU), polyimine (PI), polyvinyl chloride (PVC) Styrene C Alkyne (SAN) mixture, ethylene vinyl acetate (EVA), polydecylamine (PA), polyacetal (polyoxymethylene: POM), phenol, epoxy resin (EP), urea (UF), melanin (MF) , unsaturated polyester (UP), cerium (Si) or cyclic olefin polymer (COP). More preferably, the polymeric material may be polyethylene 2,6 naphthalate.

The second component material forms the matrix. As the second component material, a material which can be used as a matrix material in a general polymer-dispersed reflective polarizing plate can be used without limitation. Preferably, the second component material may be polyethylene 2,6 naphthalate (PEN), copolymerized 2,6 naphthalate (co-PEN), polyethylene terephthalate. (PET), polycarbonate (PC), polycarbonate (PC) alloy, polystyrene (PS), heat resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate Diester (PBT), Polypropylene (PP), Polyethylene (PE), Acrylonitrile Butadiene Styrene (ABS), Polyurethane (PU), Polyimine (PI), Polyvinyl Chloride (PVC), styrene acrylonitrile (SAN) mixture, ethylene vinyl acetate (EVA), polyamine (PA), polyacetal (polyoxymethylene: POM), phenol, epoxy resin (EP), urea (UF a material or a mixture of melanin (MF), unsaturated polyester (UP), cerium (Si), and cyclic olefin polymer (COP). More preferably, the second component material may be a copolymerized 2,6 naphthalenedicarboxylic acid in which a monomer of dimethyl-2,6-dicarboxynaphthalene, ethylene glycol or cyclohexanedimethanol (CHDM) is appropriately polymerized. Ethylene glycol ester.

As the surface layer material, a material which can be used in a general polymer-dispersed reflective polarizing plate can be used without limitation. Preferably, the surface layer material may be polyethylene 2,6 naphthalate (PEN), copolymerized 2,6 naphthalate (co-PEN), polyethylene terephthalate (PET) ), polycarbonate (PC), polycarbonate (PC) alloy, polystyrene (PS), heat-resistant polyphenylene Ethylene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene (ABS), Polyurethane (PU), polyimine (PI), polyvinyl chloride (PVC), styrene acrylonitrile (SAN) mixture, ethylene vinyl acetate (EVA), polyamine (PA), poly Acetal (polyoxymethylene: POM), phenol, epoxy (EP), urea (UF), melanin (MF), unsaturated polyester (UP), cerium (Si) or cyclic olefin polymer (COP). Preferably, the polycarbonate alloy may comprise polycarbonate and denatured ethylene glycol terephthalate (PCTG). More preferably, the polycarbonate alloy may comprise polycarbonate and denatured ethylene glycol terephthalate (PCTG) in a weight ratio of from 5:95 to 95:5. At the same time, a material having a small change in refractive index during the expansion and stretching process can be used as the surface layer material. More preferably, the surface layer material may be polycarbonate (PC) or a polycarbonate alloy.

At the same time, the first component material, the second component material, and the surface layer material may be separately supplied to separate extrusion units. In this case, three or more extrusion units can be used. Alternatively, the materials may be supplied to a single extrusion unit comprising a plurality of separate supply channels and a plurality of separate dispensing ports to prevent mixing of the materials, i.e., polymeric materials. This embodiment is also within the scope of the invention. Each extrusion unit can be an extruder. The extrusion unit can further include a heater to convert a solid polymeric material into a liquid phase.

Then, in step 2, two or more multilayer composites are formed. In each of the multilayer composites, the first and second components are alternately stacked in the form of a plurality of overlapping layer units. That is, sent by each extrusion unit The first and second component materials are injected into a plurality of composite extrusion dies to form two or more multilayer composites, and are used to reflect repetitive layers of transverse waves (S waves) having different wavelengths. The two or more multilayer composites are different in terms of the average optical thickness.

In detail, Figs. 5 to 7 are perspective views respectively showing the disassembled and coupled state of the distribution plate which can be used in one slit type extrusion die in the present invention. In particular, Figure 5 is a top view and Figure 6 is a bottom view. The slit type extrusion die includes a first distribution plate S1 disposed at one of the tops of the slit type extrusion die. The first distribution plate S1 includes a first component supply passage 50 and a second component supply passage 51. The first component material sent from the corresponding extrusion unit is injected into the first component supply passage 50, and the second component material sent from the corresponding extrusion unit is injected into the second component supply passage 51. The first distribution plate S1 may include three or more supply channels if necessary. The polymer material of the portion of the material discharged from the first distribution plate S1 is sent to a second distribution plate S2 disposed below the first distribution plate S1. In the second distribution plate S2, the first component material injected into the first component supply passage 50 is fed in a branch along a passage through a plurality of first components formed in the second distribution plate S2. Supply channels 52 and 53. Further, the second component material injected into the second component supply passage 51 is fed in a branch manner along another passage in the second distribution plate S2 through a plurality of portions formed in the second distribution plate S2. Two component supply channels 54, 55 and 56. The polymer material discharged from the second distribution plate S2 is then sent to a third distribution plate S3 disposed below the second distribution plate S2.

In the third distribution plate S3, the supply is supplied through each of the first components The first component materials of the passages 52 and 53 are fed in a branch along a passage through the first component supply passages 60, 61, 62, 63, 67, 68 formed in the third distribution plate S3, Corresponding to the first component supply channel of 69 and 70. Further, the second component material supplied through each of the second component supply passages 54, 55 and 56 is fed in a branch manner along the other passage in the third distribution plate S3 to form a third distribution. The second component of the plate S3 is supplied to a corresponding second component supply passage of the passages 57, 58, 59, 64, 65, 66, 71, 72 and 73. Supplying to a portion of the first component supply passage formed in the third distribution plate S3, that is, the first component supply passages 60 and 67, the first component material is fed to include The fourth distribution plate S4 of most channels. In detail, the first component material supplied to the first component supply channels 60 and 67 is fed to one of the first channels 74 of the fourth distribution plate S4. Similarly, the second component material supplied to a portion of the second component supply passage formed in the third distribution plate S3, that is, the first component supply passages 57, 64 and 71, is Feeding to one of the second channels 75 of the fourth distribution plate S4. In this manner, the first component material fed through the first component supply channel of the third distribution plate S3 is distributed to the odd-numbered symbol channels in the channel of the fourth distribution plate S4, that is, the channels 74, 76, 78 and 80, and the second component material fed through the second component supply passage of the third distribution plate S3 is distributed to the even symbol passages in the passage of the fourth distribution plate S4, that is, Channels 75, 77 and 79. Therefore, the first component and the second component are alternately stacked. It will be appreciated by those of ordinary skill in the art that, in accordance with the principles described above, a distribution plate having a greater number of passages in a direction perpendicular to one of the configuration directions in the fourth distribution plate S4 can be disposed therein. First Below the four distribution plates S4, and the configuration can be repeated to increase the number of channels such that the number of channels corresponds to the desired number of layers. Meanwhile, according to the above principle, the first component material fed through the odd-numbered symbol passages 74, 76, 78 and 80 of the fourth distribution plate S4 is fed to a fifth distribution plate S5, in detail, the Five even-numbered symbol channels 81, 83, 85, 87, 89, 91 and 93 of the distribution plate S5. Further, the second component material fed through the even symbol channels 75, 77 and 79 of the fourth distribution plate S4 is fed to the fifth distribution plate S5, in detail, the even number of the fifth distribution plate S5 Symbol channels 82, 84, 86, 88, 90 and 92. Figure 6 is a perspective bottom view of the slit type extrusion die of Figure 5. As shown in FIG. 6, each channel of the fifth distribution plate S5 does not adopt a structure including one of the plurality of divided holes, but adopts a slit structure. When the first and second component materials channel corresponding passages in the channels, i.e., slits, they form respective layers. Therefore, the number of layers in a multilayer composite can be determined depending on the number of slits in the fifth distribution plate S5. The number of layers may be equal to or greater than 100, preferably equal to or greater than 150, more preferably equal to or greater than 200, and most preferably equal to or greater than 300. Then, a multilayer composite is discharged through one of the outlets 94 of a sixth distribution plate S6. Figure 8 is a cross-sectional view showing a multilayer composite. Referring to FIG. 8, first components 100 and 102 and second components 101 and 103 are alternately stacked. In this case, a first component 100 and the second component 101 contacting the first component 100 can be defined as a re-coating unit. A composite includes a plurality of resurfacing units.

Figures 5 through 7 show a plurality of distribution plates that can be used in one of the slit type extrusion dies that can be used in the present invention. What should be understood by those of ordinary skill in the art of the invention is the number and structure of the distribution plates and the dimensions of the distribution channels. The size and shape can be determined by one of ordinary skill in the art to make a plurality of first and second components alternately stacked one multilayer composite. The slit width in the fifth distribution plate and on the lower surface of one of the fifth distribution plates may be 0.17 to 0.6 mm, and the width of the outlet may be 5 to 50 mm, but the invention is not limited thereto. Moreover, it should be understood by those of ordinary skill in the art that the width of each slit can be determined in consideration of the expansion and stretching procedures to be subsequently performed.

Meanwhile, in order to allow the plurality of multilayer composites to cover different wavelength ranges of light, the optical thicknesses of the overlapping layer units of the first and second components alternately stacked and the number of the overlapping layer units are The different multilayer composites in the multilayer composites can be different. To this end, the multilayer extrusion dies corresponding to different multilayer composites may be different in terms of the dimensions of the channels, the thickness and shape or the number of layers of the slits. Reflective polarizers made entirely through expansion and stretching procedures include a majority of the layers formed therein, including a plurality of repeater units. The layers can be set to have different optical thicknesses.

As described above, "optical thickness" means "n (refractive index) x d (physical thickness)". Therefore, when the multilayer composite having the same material as the first component is formed, that is, when there is no refractive index difference between the two multilayer composites, the first and the first inclusions included in each multilayer composite are adjusted The average of the physical thicknesses d of the respective overlapping layer units of the two components is such that the average physical thickness values in the multilayer composites are different, and an optical thickness difference can be produced between the multilayer composites. In this manner, multilayer composites having different optical thicknesses can be fabricated by designing slit-type extrusion dies having different slit widths.

At the same time, to cover the entire range of wavelengths of visible light, the average optical thickness of the multilayer composites must be determined such that the average optical thickness corresponds to various wavelengths of light. For example, when the average optical thickness of the repeated layer units in the three-layer composite is set to correspond to wavelengths of 450 mm, 550 nm, and 650 nm, respectively, they may have at least 5%, more preferably equal to or greater than 10%. Deviation. By this thickness deviation, S waves in the entire wavelength range of visible light can be reflected. In this case, the thicknesses of the first and second components constituting the repeating layer unit may be equal.

In the slit type extrusion die for forming a multilayer composite, the number of channels, the cross-sectional area and shape, and the width of the slits may be the same or different. Further, the optical thicknesses of the repeating layer units forming a multilayer composite may have a deviation from the average value of preferably equal to or less than 20%, more preferably equal to or less than 15%. For example, when the average optical thickness of the resurfacing units of the multilayer composite is 200 nm, the first components may have an optical thickness deviation of about 20% or less. Meanwhile, as described above, the wavelength of light and the optical thickness are defined according to the following formula 1: [Formula 1] λ = 4 nd

Wherein "λ" represents the wavelength (nm) of light, "n" represents a refractive index, and "d" represents a physical thickness (nm).

Therefore, when there is a deviation in the optical thickness (nd), it can cover not only the target wavelength of a light but also a certain wavelength range including the target wavelength. Therefore, in this case, uniform optical properties can be easily promoted. Meanwhile, the thickness "d" represents the thickness of one layer. Here, due to the various overlapping units The two layers formed by the first and second components are respectively formed, so the relationship between the overlapping layer units and the wavelength of light can be defined according to the following formula 2.

[Formula 2] λ = 2 (n ₁ d ₁ + n ₂ d ₂ )

Wherein, "λ" represents the wavelength of light (nm), "n ₁ " represents the refractive index of a first layer, "d ₁ " represents the physical thickness (nm) of a first layer, and "n ₂ " represents a second The refractive index of the layer, "d ₂ ", represents the physical thickness (nm) of a second layer.

The above optical thickness deviation can be obtained by using a slit-type extrusion die having a deviation in the number of channels, the cross-sectional area and shape, and the width of the slit. The above optical thickness deviation can also be naturally obtained by a small difference in the separation pressure naturally generated in an extended program.

Thus, most of the multilayer composites of the present invention can encompass the full range of wavelengths of visible light by the average optical thickness of the repeating layer units disposed in the multilayer composites such that the average optical thicknesses are different. Further, when the overlapping layer unit of each of the multilayered composites has a proper thickness deviation, the multilayered composite can reflect S waves of a large wavelength range. Meanwhile, although a multilayer composite produced by a slit type extrusion die has been described with reference to Figs. 5 to 7, the slit type extrusion die can be divided into a plurality of segments to produce a multilayer composite, and then laminated. The resulting multilayer composite. This extrusion die is also considered to be an integral slit type extrusion die and, therefore, it is within the scope of the present invention. By designing a plurality of slit-type extrusion dies, the slit-type extrusion dies are different in terms of slit widths included in the slit-type extrusion dies, and multilayer composites having different optical thicknesses can also be produced. body.

According to another preferred embodiment of the present invention, the manufacturing method can be further Included between step 1 and step 2, respectively, through a plurality of first pressurizing units having different displacements, supplying the first component material sent from the corresponding extrusion unit to different slit-type extrusion dies to form A multilayer composite having different average optical thicknesses. In detail, Figure 9 is a schematic view showing a plurality of first pressurizing units for forming a two-layer composite. The first component material sent out by the corresponding pressing unit (not shown) is supplied to the first pressurizing units 130 and 131 in a branched manner. The constituent materials from the first pressurizing units 130 and 131 are then supplied to the slit-type extrusion dies 132 and 133, respectively. In this case, the first pressurizing units 130 and 131 have different displacements. Therefore, even when the slit-type extrusion dies 132 and 133 have the same specifications (in terms of the width of the slit), the average optical thickness is formed by the respective slit-type extrusion dies 132 and 133. One can be different from the second multilayer composite.

To this end, the first pressurizing units 130 and 131 may have a displacement of 1 to 100 kg/h. Of course, the invention is not limited to this value.

Meanwhile, the first component material may be fed to the two slit type extrusion die by a first pressing unit, and the two multilayer composite bodies respectively formed by the two slit type extrusion dies are laminated to form a layer group. . In this case, the completed reflective polarizer may have a four-layer group formed by four first pressurizing units and eight slit type extrusion dies. It is also possible to feed the first component material to three or more slit type extrusion dies using a first pressurizing unit.

According to another preferred embodiment of the present invention, the manufacturing method may further include, between step 1 and step 2, respectively, supplying a second pressing unit having a different displacement, and supplying the second unit sent by the corresponding pressing unit. The steps of the component materials to different slit-type extrusion dies to form different average optical thicknesses Multi-layer composite. In detail, Figure 10 is a schematic diagram showing a plurality of second pressurizing units for forming a two-layer composite. The second component material sent out by the corresponding pressing unit (not shown) is supplied to the second pressurizing units 140 and 141 in a branched manner. The constituent materials from the second pressurizing units 140 and 141 are then supplied to the slit-type extrusion dies 142 and 143, respectively. In this case, the second pressurizing units 140 and 141 have different displacements. Therefore, even when the slit-type extrusion dies 142 and 143 have the same specifications (in terms of the shape, diameter, etc. of the second component supply passage), the average optical thickness of the second component is transmitted through The first and second multilayer composites formed by the respective slit-type extrusion dies 142 and 143 may be different. To this end, the second pressurizing units 140 and 141 may have a displacement of 1 to 100 kg/hr. Of course, the invention is not limited to this value.

At the same time, the second component material can be fed to the two-slit extrusion die by a second pressing unit, and the two-layer composite formed by the two slit-type extrusion dies can be laminated to form a layer. . In this case, the completed reflective polarizer may have a four-layer group formed by four second pressurizing units and eight slit type extrusion dies. It is also possible to feed the second component material to three or more slit type extrusion dies using a second pressurizing unit.

Then, in step 3, two or more layers of the composite are laminated to form the core layer. In detail, FIG. 11 is a schematic view showing a laminated unit for laminating a multilayer composite. The build-up unit laminates the multilayer composites 161, 162, 163 and 164 manufactured by the respective slit-type extrusion dies to form a core layer 165. At the same time, the lamination step can be carried out in another place. Alternatively, when an integral slit type extrusion die is used, the lamination step may use one In addition, the distribution board of the channel grouping. When the number of multilayer composites is large, multi-stage lamination can be carried out in order to achieve an easy lamination. That is, the multilayer composites are divided into a multi-layer composite group in which the multilayer composites are laminated, and then the laminates are laminated. Meanwhile, in order to laminate the surface layer material, the method may further include, in step 3, laminating a surface layer material from an extrusion unit on at least one surface of the core layer, or the surface layer material before performing step 4. The step of laminating on the core layer formed in step 3. The surface layer material can be laminated on opposite surfaces of the core layer. When the surface layers are respectively laminated on the opposite surfaces of the core layer, the surface layers may be the same or different in terms of material and thickness.

At the same time, another pre-expansion step can be implemented between step 2 and step 3 or between step 3 and step 4 to easily achieve the expansion of the repeating layer units, as will be explained later.

Next, in step 4, the core layer of the surface layer is expanded by a flow control unit. In detail, Figure 12 is a cross-sectional view showing a hanger mold which is preferably one of the flow control units in accordance with the present invention. Figure 13 is a side view corresponding to Figure 12. Using the hanger mold, the extent of expansion of the core layer can be suitably adjusted such that the repeating layer units have an optical thickness suitable for reflecting one of the desired wavelengths of light. This adjustment can be designed in consideration of the fact that the optical thickness will be further reduced in the subsequent stretching process. In detail, since the surface layer core layer fed to the hanger mold through a certain passage is widely spread laterally in the hanger mold, as shown in FIG. 12, it is included in the core layer. The components are also extensively expanded laterally. Moreover, as shown in the side view of FIG. 13, the hanger mold has a slit structure, and the slit structure has a downwardly reduced cross section. The area has a large longitudinal width at the same time, and thus the surface layered core layer is expanded in one width direction while the thickness is reduced. That is, the Pascal principle is applied to the core layer. In a constrained system, a fluid expands in a width direction based on the principle that fluid pressure is transmitted to all portions of a constrained system that includes a plurality of fine portions. According to this principle, the hanger mold has a structure in which an outlet is widened in a width direction and reduced in a thickness direction as compared with an inlet. That is, the hanger mold uses the Pascal principle to control the flow and shape of a molten material by one of the pressures in a constrained system. In this regard, it is desirable to produce a desired flow rate of a polymer and a desired viscosity of a polymer to produce a laminar flow having a Reynolds number equal to or less than 2,500. When a vortex of a polymer having one of the Reynolds numbers of more than 2,500 is produced, it is impossible to produce a uniform plate shape. In this case, it is possible to produce a deviation in optical properties. The exit of the hanger mold can have a longitudinal width of 800 to 2,500 mm. In this case, it is necessary to control the pressure of the polymer stream in order to prevent the Reynolds number of the polymer stream from exceeding 2,500. This is because when the Reynolds number of the polymer stream exceeds 2,500, it becomes eddy current, thus displacing the polymer configuration of the core layer. In addition, the temperature within the core layer can range from 265 to 310 °C.

The flow control unit can be a T-shaped film or a split-type hanger mold that can produce an extension of the overlapping layer units. Of course, the invention is not limited to the hanger mold. A variety of different hanger molds can be used without limitation, as long as they produce an extension of the core layer.

According to the manufacturing method of the present invention, since a plurality of slit-type extrusion dies are used to manufacture a plurality of multilayer composites having different average optical thicknesses, and then A layer is laminated in a molten state, so no additional adhesive layer and/or a protective boundary layer (PBL) is required. It is also possible to completely reflect the S wave in the entire wavelength range of visible light. Further, according to the manufacturing method of the present invention, a surface layer is formed on at least one surface of the core layer in a molten state and, therefore, the core layer undergoes another bonding process. Therefore, the manufacturing cost can be remarkably reduced. Also, there is a great advantage in maximizing optical properties in a finite thickness.

According to a preferred embodiment of the present invention, the manufacturing method may further comprise the step (5) of cooling and planarizing the extended polarizing plate sent by the flow control unit after the step 4, and stretching the polarizing after the planarizing step. Step (6) of the plate, and step (7) of hardening the stretched polarizing plate.

First, in step 5, that is, the step of cooling and planarizing the extended polarizing plate sent out by the flow control unit can be carried out in the same manner as the general reflective polarizing plate manufacturing method. That is, the expanded polarizing plate is cooled and solidified, and then planarized by a casting roll program.

Then, the polarizing plate after the planarization step is subjected to a stretching process. This stretching can be carried out using a general reflection type polarizing plate stretching program. A refractive index difference is produced between the first component and the second component by the stretching procedure. Thus, light modulation can occur at the interface between the first component and the second component. Through the stretching, the extended repeating unit finally has an optical thickness corresponding to one of a desired wavelength range. Therefore, in consideration of the width of the slit-type extrusion die, the conditions for the expansion, and the stretching ratio, the desired optical thickness of one of the overlapping layer units in the reflective polarizing plate can be appropriately set. Therefore, in order to obtain an intended aspect ratio, the stretching procedure can be carried out by uniaxial stretching or biaxial stretching. More preferably, uniaxial stretching can be carried out. In uniaxial stretching, the stretching direction may be a longitudinal direction. Also, the draw ratio may be 3 or 12. At the same time, one method of converting an isotropic material such that the material has birefringence is well known in the art. For example, when a polymer is stretched at a suitable temperature, the molecules of the polymer can be aligned and, therefore, the polymer has birefringence.

Then, in step 7, the stretched polarizing plate is hardened. Therefore, a completed reflective polarizer is fabricated. This hardening can be carried out using a general method. Preferably, the hardening can be carried out at 180 to 200 ° C for 0.1 to 3 minutes using an infrared (IR) heater.

Meanwhile, when the desired average optical thickness of the repeated layer units in each layer group is determined, the criteria of the slits, the standard of the flow control unit, the stretching ratio, etc. can be appropriately controlled in consideration of the determination values. And thus the reflective polarizing plate of the present invention is fabricated.

The multilayer reflective polarizing plate manufactured according to the above method comprises a core layer, and the core layer comprises a plurality of first layers having an inner birefringence and a plurality of second layers alternately stacked with the first layers to transmit The first polarizing component of the light irradiated on the outer side of the reflective polarizing plate simultaneously reflects the second polarizing component of the light. The first and second layers have a refractive index difference in at least one axial direction. The first and second layers are stretched in at least one axial direction. The first and second layers form a plurality of repeating layer units each including a first layer and a second layer. The overlapping layer elements are divided into a plurality of arrays for reflecting a plurality of transverse waves (S waves) of a desired wavelength, respectively. The number of sets of the repeated layer units is two or more. These groups are combined into one. The different sets of such re-coating units have different average optical thicknesses. a surface layer can be integrally formed at the core On at least one surface of the layer. In this case, no adhesive layer is formed between the core layer and the surface layer.

Figure 14 is a cross-sectional view showing a multilayer reflective polarizing plate in accordance with an embodiment of the present invention. In the reflective polarizing plate, surface layers 189 and 190 are formed on the opposite surfaces of a core layer 180, respectively. The core layer 180 is divided into two layers A and B. The dashed line in Fig. 5 for dividing the core layer 180 into the layer groups A and B is an imaginary line. This layer group A comprises first layers 181 and 183 of the first component and second layers 182 and 184 of the second component. The first layers 181 and 183 and the second layers 182 and 184 are alternately stacked. Here, one of the first layer and the second layer in the layer group A corresponds to the second layer. For example, the first layer 181 and the second layer 182 are defined as a double layer unit R1. This layer group A can comprise at least 25 overlapping layer units. Similarly, layer group B includes first layers 185 and 187 of the first component, and second layers 186 and 188 of the second component. The first layers 185 and 187 and the second layers 186 and 188 are alternately stacked. Here, one of the first layer and the second layer in the layer group B corresponds to the second layer. For example, the first layer 185 and the second layer 186 are defined as a double layer unit R2. This layer group B may comprise at least 25 overlapping layer units. The number of the recoat units is preferably equal to or greater than 50, more preferably equal to or greater than 100, and most preferably equal to or greater than 150. Each of the first layers and each of the second layers may have the same thickness.

Moreover, each of the overlapping layer units R1 of the layer group A and the respective overlapping layer units R2 of the layer group B have different average optical thicknesses. Therefore, the overlapping layer units R1 and R2 respectively reflect S transverse waves of different wavelength ranges. The optical thickness of each of the overlapping layer units R1 of the layer group A may have a preferred optical thickness equal to or less than 20% with respect to the average optical thickness of the overlapping layer units R1 of the layer group A, and More preferably equal to or less than 15% deviation. Therefore, when the re-coating unit R1 of the layer group A has an average optical thickness of 200 nm, according to the formula 2, the layer group A can reflect a transverse wave (S-wave) having a wavelength of 400 nm. When the re-coating unit R1 of the layer group A has a thickness deviation of 20% in this case, the layer group A can cover a wavelength range of 320 to 480 nm. On the other hand, when the re-coating unit R2 of the layer group B has an average optical thickness of 130 nm, according to the formula 2, the layer group B can reflect a transverse wave (S-wave) having a wavelength of 520 nm. When the repeating layer units R2 of the layer B have a thickness deviation of 20% in this case, the layer group B may cover a wavelength range of 420 to 620 nm. In this case, the wavelength range of the layer group B partially overlaps with the wavelength range of the layer group A, and therefore, the optical modulation effect can be maximized. Moreover, since the plate-shaped polymers should transmit P waves and reflect S waves, when the first layers have birefringence, they must be set in a light transmission direction, that is, a thickness direction, and the same weight. One of the cladding units has a refractive index n, (z-axis refractive index), and calculates an average optical thickness of one of the overlapping layer units.

Figure 15 is a cross-sectional view showing a multilayer reflective polarizing plate in accordance with another preferred embodiment of the present invention. This reflective polarizing plate will be mainly explained together with the difference from the reflective polarizing plate of Fig. 14. In the reflective polarizing plate of Fig. 15, three layers A, B and C are formed in a core layer. The layer groups A, B and C are different in terms of the average optical thickness of the repeating unit.

Figure 16 is a cross-sectional view showing a multilayer reflective polarizing plate in accordance with another preferred embodiment of the present invention. In detail, the reflective polarizing plate comprises a core layer divided into four layers. Each layer set may have an average optical thickness, and the average optical thicknesses are adjusted to cover 350 nm, 450 nm, respectively. The wavelength range of light at 550 nm and 650 nm. In this case, the layer group formed as the outer layer portion of the core layer may have a large average optical thickness, and the layer group formed as the inner layer portion of the core layer may have a small average optical thickness. Meanwhile, in order to cover the entire wavelength range of visible light, the average optical thickness of the polymer in each layer group should be determined to correspond to various light wavelengths. When the average optical thickness of the overlapping layer units of each layer group in the core layer is determined to correspond to optical wavelength ranges including 350 nm, 450 nm, 550 nm, and 650 nm, respectively, the average optical thickness may be in the layer group There is a deviation of at least 5%, more preferably equal to or greater than 10%. Therefore, S waves in the entire wavelength range of visible light can be reflected.

At the same time, the layer stack of the core layer can be integrally formed without forming an adhesive layer between adjacent layer groups. Further, the core layer and the surface layers are integrally formed. Therefore, not only the deterioration of the optical properties caused by an adhesive layer but also the formation of more layers in the core layer having a finite thickness can be avoided. Therefore, the optical properties can be remarkably improved. Further, the surface layers are subjected to a stretching process after being formed together with the core layer. Thus, unlike the conventional case where the core layer is bonded to the non-stretched surface layer after being stretched, the surface layers of the present invention can be stretched in at least one direction. Therefore, the surface layer of the present invention has a higher surface hardness than the non-stretched surface layer. Therefore, improvement in scratch resistance and improvement in heat resistance are achieved.

In accordance with a preferred embodiment of the present invention, a birefringent interface can be formed between the first layer and the second layer of each of the repeating layer units forming the core layer. In detail, in one of the first and second layers of the multilayer reflective polarizing plate, one of the first and second layers X, Y or The fact that the refractive indices of the Z-axis are substantially equal or unequal affects the degree of scattering of the polarized light in the corresponding axis. Generally, the scattering power is proportional to the square of the degree of unequal refractive index. Thus, as the refractive indices along a particular axis increase unequally, the light polarized along that axis scatters more strongly. Conversely, when the refractive indices along a particular axis decrease unequally, the degree of scattering of light polarized along the axis decreases. When the refractive index of the second layer in one axis is substantially equal to the refractive index of the first layer, regardless of the size, shape or density of the first layer, incident light polarized by an electric field parallel to the axis will The first layer is passed without scattering. More specifically, the first polarized light (P wave) passes through the reflective polarizer without being affected by a birefringent interface formed at one of the boundaries between the first and second layers, and the second The polarized light (S wave) is affected by the birefringent interface formed at the boundary between the first and second layers, and will be modulated. Therefore, the P waves are transmitted through the reflective polarizer, and the S waves are modulated by, for example, scattering or reflection. Therefore, the P and S polarized beams are separated.

Therefore, when a birefringent interface is formed between the first and second layers, a light modulation effect can be produced. Therefore, when the second layer is optically isotropic, the first layer must have birefringence. Conversely, when the second layer is optically birefringent, the first layer must be optically isotropic. In detail, when the first layer has an x-axis refractive index nX1, a y-axis refractive index nY1 and a z-axis refractive index nZ1, and the second layer has an x-axis refractive index nX2, a y-axis refractive index In the case of nY2 and a z-axis refractive index nZ2, in-plane birefringence occurs between nX1 and nY1. More preferably, the first and second layers may differ from each other in terms of at least one refractive index of their x, y and z axis refractive indices. Better, when When the axis of extension is the x-axis, the first and second layers have a refractive index difference equal to or less than 0.05 in the y-axis and z-axis directions, and a refraction equal to or greater than 0.1 in one of the x-axis directions Rate difference. Generally, when the first and second layers have a refractive index difference equal to or less than 0.05, they are considered to be similar.

According to a preferred embodiment of the present invention, the total number of layers in the core layer of the multilayer reflective polarizing plate may be from 100 to 2,000. The thickness range of each of the overlapping layer units can be appropriately designed according to a wavelength range of a desired light and a desired refractive index. The thicknesses of the first and second layers constituting each of the overlapping layer units may be substantially the same or different. Meanwhile, in the present invention, the core layer may have a thickness of 10 to 300 μm, and each surface layer may have a thickness of 50 to 190 μm. Of course, the invention is not limited to this thickness.

According to a preferred embodiment of the present invention, there is provided an apparatus for manufacturing a multilayer reflective polarizing plate, the multi-layer reflective polarizing plate comprising a core layer having first and second components alternately stacked, The device comprises: two or more extrusion units, and the materials of the first component and the materials of the second components are respectively supplied to the two or more extrusion units; a rotating block, including a majority a slit type extrusion for accommodating a first component material sent from a corresponding one of the extrusion units and a second component material sent from the extrusion unit to the extrusion unit a mold, thus forming a multilayer composite comprising two or more alternating stacked repeating unit units of the first and second components, and the overlapping layer units of the multilayer composites have different average optical thicknesses so that a transverse wave (S wave) reflecting a desired wavelength; a collecting block for stacking two or more multilayer composites sent out by the rotating block, thereby forming the core layer; and a flow control unit for To expand the surface layer core layer sent by the collection block.

When a surface layer is to be laminated on at least one surface of the core layer, the apparatus may further include a feed block in communication with one of the extrusion units that are separately injected into the surface layer material, to include the rotating block A surface layer is laminated on at least one surface of one of the structures of the multi-layered composite. Alternatively, in accordance with a preferred embodiment of the present invention, the apparatus may further include an extrusion unit, and a surface layer material is separately injected into the extrusion unit, and the extrusion mold is connectable to the collection block to A surface layer is laminated on at least one surface of the core layer.

Figure 17 is a schematic diagram of an apparatus for fabricating a multilayer reflective polarizer comprising a core layer and a plurality of surface layers integrated with the core layer in accordance with a preferred embodiment of the present invention. In detail, the apparatus includes a first extrusion unit 220 for supplying a first component material, a second extrusion unit 221 for supplying a second component material, and a third extrusion for supplying a surface layer material. Unit 222. The first pressing unit 220 is in communication with a rotating block C including one of the four slit type extrusion dies 223, 224, 225 and 226. In this case, the first pressing unit 220 supplies the first component material to the four slit type extrusion dies 223, 224, 225 and 226 in a molten state. Further, the second pressing unit 221 is in communication with the rotating block C, and supplies the second component material to the four slit type extrusion dies 223, 224, 225 and 226 in a molten state. Through the four slit type extrusion dies 223, 224, 225 and 226, four multilayer composites having different average optical thicknesses are produced. Each of the multilayer composites has a structure in which the overlapping layer units of the first and second components are alternately stacked. The multilayer composites are different in terms of the average optical thickness of the resurfacing units of. Therefore, each of the slit-type extrusion dies of the four-slot type extrusion dies 223, 224, 225, and 226 may be the slit-type extrusion die shown in Fig. 8. Although the four-slot extrusion die is shown, it will be appreciated that an integral slit extrusion die is also within the scope of the present invention. The four-layer composite system produced by the slit-type extrusion dies 223, 224, 225 and 226 is laminated in a collecting block 227 to form a core layer. In this case, the collection block 227 can have a separate structure. Alternatively, when an integral slit type extrusion die is used, the collection block 227 may take the form of a channel grouping distribution plate disposed in the slit type extrusion die to laminate the multilayer composites. The core layer formed by laminating in the collection block 227 is fed to a feed block 228. In the feed block 228, the surface layer material fed from the third extrusion unit 222 is layered on the core layer. To this end, the third pressing unit 222 is in communication with the feed block 228. The surface layer core layer is sent to a flow control unit 229, and the flow control unit 229 regenerates the expansion of the first component in the core layer. The flow control unit can be a T-die or a hanger mold such that the first components can be formed into a plate shape. Meanwhile, when the layer of the core layer and the surface layer are implemented in the collecting block 227, the feeding block 228 may be omitted.

Figure 18 is a schematic view of an apparatus for manufacturing a multilayer reflective polarizing plate in accordance with another preferred embodiment of the present invention. This device will be explained primarily in conjunction with its differences from the device of Figure 17. The first pressing unit 220 feeds the first component material to the four first pressurizing units 233, 234, 235 and 236. The first pressurizing units 233, 234, 235 and 236 have different displacements, and respectively discharge the first component material to the plurality of slit-type extrusion dies 241, 242, 243 and 244. The second pressing unit 221 feeds the second component material to the fourth second pressurizing units 237, 238, 239 and 240. The second pressurizing units 237, 238, 239 and 240 have different displacements and discharge the second component material to the plurality of slit-type extrusion dies 241, 242, 243 and 244, respectively. Through the four slit type extrusion dies 241, 242, 243 and 244, four multilayer composites having different average optical thicknesses are produced. The first pressurizing unit, the second pressurizing unit, and the plurality of slit-type extrusion dies constitute a rotating block C.

Figure 19 is a schematic view of an apparatus for manufacturing a multilayer reflective polarizing plate in accordance with another preferred embodiment of the present invention. This device will be explained primarily in conjunction with its differences from the device of Figure 18. Unlike the case of using a four-slot type extrusion die, this apparatus has a feature of performing a multi-stage laminate using an 8-slot type extrusion die to fabricate a multilayer reflection type polarizing plate comprising a four-layer group. In detail, the first pressurizing unit 233 discharges the first component material to the two slit type extrusion dies 250 and 251. The second pressurizing unit 234 also discharges the second component material to the two slit-type extrusion dies 250 and 251. In this case, the first and second pressurizing units 233 and 234 are equal, and the two slit-type extrusion dies 250 and 251 are equal. Therefore, the multilayer composite formed by the slit-type extrusion dies 250 and 251 has the same average optical thickness. In the above manner, an 8-layer composite is formed, and then each of the two multilayer composites of the eight-layer composite is laminated in the first laminate units 258, 259, 260, and 261 so that each of the two average optical thicknesses has two The multilayer composite is laminated in one of the first laminate units 258, 259, 260, and 261 corresponding to the first laminate unit to form a four-layer composite. The multilayer composites are then laminated in a second buildup unit 262 to form a core layer.

Meanwhile, although the first pressurizing unit feeds the first component material to the two slit type extrusion die in conjunction with FIG. 19, those having ordinary knowledge in the art to which the invention pertains should understand that each of the first pressurizing units can be The first component material is fed to three or more slit type extrusion dies. This can also be applied to the second pressurizing units.

Further, in accordance with a preferred embodiment of the present invention, a liquid crystal display (LCD) device including the reflective polarizing plate of the present invention is provided. In detail, Fig. 20 shows an example of a liquid crystal display device using one of the reflective polarizers of the present invention. Referring to FIG. 20, a reflector 280 is embedded in a frame 270, and a plurality of cold cathode fluorescent lamps (CCFLs) 290 are disposed on an upper surface of the reflector 280. An optical film 320 is disposed on an upper surface of the cold cathode fluorescent lamp 290. The optical film 320 includes a diffusion plate 321 , a light diffusion film 322 , a film 323 , a reflective polarizer 324 , and a polarizing absorption film 325 . The stacking sequence can be varied depending on the intended purpose, and certain elements of the optical film 320 can be omitted or a plurality of components can be provided. For example, the diffusion plate 321, the light diffusion film 322, or the tantalum film 323 may be omitted from the optical film 320, or its stacking order or position may be changed. Further, a retardation film (not shown) or the like may be disposed at an appropriate position in the liquid crystal display device. Further, a liquid crystal display (LCD) panel 310 may be disposed on an upper surface of the optical film 320 in a state in which the liquid crystal display panel 310 is embedded in a mold frame 300.

Hereinafter, the liquid crystal display device will be mainly explained together with the movement path of the same light. Light emitted from the cold cathode fluorescent lamps 290 reaches the diffusion plate 321 of the optical film 320. Then, the light emitted by the diffusion plate 321 The light diffusing film 322 is passed through such that it can be transported in a direction perpendicular to the optical film 320. Then, the light emitted from the light-diffusing film 322 passes through the tantalum film 323 and reaches the reflective polarizing plate 324, thereby generating optical modulation of the light. In detail, the P wave component of the light passes through the reflective polarizing plate 324 without optical loss, and after performing optical modulation (reflection, scattering, refraction, etc.), the S wave component of the light The reflection plate 280 disposed on the rear side of the cold cathode fluorescent lamp 290 is reflected. The S-wave component of the light is then randomly converted into a P or S wave and passed through the reflective polarizer 324. After passing through the polarizing absorbing film 245, the light reaches the liquid crystal display panel 310. Therefore, it is expected that when the reflective polarizing plate of the present invention is used in a liquid crystal display device, a substantial increase in brightness is achieved in accordance with the above principle as compared with a general reflective polarizing plate. At the same time, the cold cathode fluorescent lamps 290 can be replaced by light emitting diodes (LEDs).

Although the use of the reflective polarizing plate according to the present invention has been mainly described together with the liquid crystal display device, the present invention is not limited thereto. The reflective polarizer can be widely used in flat panel display technology related to projection displays, plasma display panels (PDPs), electroluminescent displays (ELDs) and the like.

Form of invention

Hereinafter, the present invention will be described in detail with reference to a plurality of examples and experimental examples. The following examples and experimental examples are intended to illustrate and not to limit the scope of the invention.

example 1

The procedure shown in Fig. 17 is implemented. In detail, a first component A second component material and a surface layer material are separately injected into the first, second and third extrusion units. The first component material is polyethylene 2,6 naphthalate (PEN) having a refractive index of 1.65. The second component material is copolymerized ethylene 2,6 naphthalate (co-PEN) having a refractive index of 1.64. The copolymerized ethylene glycol 2,6 naphthalate is obtained by mixing dimethyl terephthalate and dimethyl-2,6-dicarboxynaphthalene with a molar ratio of 6:4 to ethylene glycol. (EG) is produced by a molar ratio of 1:2. The surface layer material is a polycarbonate alloy having a refractive index of 1.58, and the polycarbonate alloy is polymerized with 90% by weight of polycarbonate and 10% by weight of poly(ethylene terephthalate) (PCTG). The first and second component materials were extruded at a temperature of 295 ° C and the polymer flow system was examined using a capillary rheometer, and then corrected by I.V. adjustment according to the results of the inspection. The extrusion process for the surface layer material was carried out at a temperature of 280 °C.

A four-slit extrusion die as shown in Figures 6 and 7 was used to produce four composites having different average optical thicknesses. In detail, the first component material sent from the first pressurizing unit and the second component material sent from the second pressurizing unit are supplied to the four slit type extrusion dies. Each slit type extrusion die was formed into 300 layers. The thickness of the slit in the lower surface of the fifth distribution plate in the fifth distribution plate is 0.26 mm in the case of the first slit type extrusion die, and in the case of the second slit type extrusion die 0.21 mm is 0.17 mm in the case of the third slit type extrusion die, and is 0.30 mm in the case of the fourth slit type extrusion die. The outlet of the sixth distribution plate of each slit type extrusion die has a size of 15 mm × 15 mm. The four composite systems discharged from the four-slot extrusion die are fed along separate channels and then laminated in a collection block. To form a single core layer polymer. The surface layer material from the third extrusion unit is supplied to a feed block having a three-layer structure to form a surface layer on the lower layer polymer and on the lower surface polymer. The core layer formed with the surface layers is expanded in a hanger mold as shown in Figs. 15 and 16 by adjusting the flow rate and pressure gradient. In detail, the hanger mold has a longitudinal width of 200 mm and a lateral width of 20 mm at its inlet and a longitudinal width of 960 mm and a lateral width of 2.4 mm at its outlet. Further, the hanger mold has a flow rate of 1 m/min. Then, a cooling process and a flattening process are implemented. This flattening procedure is carried out using a casting roll. Next, the expanded core layer polymer was stretched at a stretching speed of 6 times in a machine direction (MD direction). Thus, the longitudinal vertical cross-section of each of the first components has a shortened shorter axial length and no change in longer axial length. The hardening was then carried out at 180 ° C for 2 minutes using an infrared heater. Therefore, a multilayer reflective polarizing plate as shown in Fig. 7 was produced. In the reflective polarizing plate, the first component has an x-axis refractive index nx of 1.88, a y-axis refractive index ny of 1.64, and a z-axis refractive index nz of 1.64, and the second component has a 1.64. Refractive index. Further, in the layer group A of the reflective polarizing plate including the layer groups A to D, the number of layers is 300 (150 overlapping layer units), the thickness of each of the overlapping layer units is 168 nm, and the average optical thickness is 275.5 nm. And the optical thickness deviation is about 20%. In the layer group B, the number of layers is 300 (150 overlapping layer units), the thickness of each of the overlapping layer units is 138 nm, the average optical thickness is 226.3 nm, and the optical thickness deviation is about 20%. In the layer group C, the number of layers is 300 (150 overlapping layer units), the thickness of each of the overlapping layer units is 110 nm, the average optical thickness is 180.4 nm, and the optical thickness deviation is about 20%. In layer D, the number of layers is 300 (150 The recoat unit) has a thickness of 200 nm, the average optical thickness is 328 nm, and the optical thickness deviation is about 20%. The core layer of the prepared multilayer reflective polarizer has a thickness of 92.4 μm. Each of the surface layers has a thickness of 153.8 μm such that the multilayer reflective polarizing plate has a total thickness of 400 μm.

Example 2

An 800-layer reflective polarizing plate was produced by the same procedure as in Example 1, except that the number of layers in each of the slit-type extrusion dies in the four-slot type extrusion die was 200. The core layer of the resulting multilayer reflective polarizer has a thickness of 61.6 μm. Each of the surface layers has a thickness of 169.2 μm such that the multilayer reflective polarizing plate has a total thickness of 400 μm.

Example 3

A 600-layer reflective polarizing plate was fabricated by the same procedure as in Example 2, but the third slit-type extrusion die was not used.

Comparative example 1

An 800-layer reflective polarizing plate comprising the same layer set was fabricated by the same procedure as in Example 2, but none of the four extrusion dies had the same slit width.

Comparative example 2

Using the four slit type extrusion die of Example 1, a plurality of sheets corresponding to the respective multilayer reflective polarizing plates of the four sets of multilayer reflective polarizing plates manufactured in Example 1 were prepared, and then the sheets were individually stretched. The four sets of sheets are bonded using a pressure sensitive adhesive to form a core layer. Then, a plurality of surface layers are respectively bonded to the opposite surfaces of the core layer. So make an 800 layer reflection Polarizer. The core layer of the prepared multilayer reflective polarizer has a thickness of 83.2 μm. Each of the surface layers has a thickness of 158.4 μm such that the multilayer reflective polarizing plate has a total thickness of 400 μm. The thickness of the pressure sensitive adhesive layer includes the thickness of each of the core layer and a plurality of surface layers.

Experimental example

The properties of the reflective polarizing plates manufactured in the above Examples 1 to 3 and Comparative Examples 1 and 2 were measured as follows. Again, the results of these measurements are shown in Table 1.

Transmittance

Transmission axis transmittance and reflection axis transmittance were measured according to an ASTM D1003 method using a COH300A analysis apparatus available from NIPPON DENSHOKU Co., Ltd., Japan.

2. Polarization

The degree of polarization was measured using a RETS-100 analytical device purchased by OTSKA.

3. Relative brightness

For each of the reflective polarizing plates manufactured as described above, luminance measurement was performed as follows. A panel was assembled on a 32" direct type backlight unit having a diffusing plate and the reflective polarizing plate, and 9 points were measured using a BM-7 meter purchased by Topcon Corporation. One of the measured values is an average value. It is expressed as a relative brightness.

When the brightness of the reflective polarizing plate of Example 1 is set to 100 (reference value), the relative values of the brightness of the reflective polarizing plate of each of the examples and the comparative examples to the brightness of the reflective polarizing plate of Example 1 are A relative brightness representation.

As can be seen from Table 1, it can be seen that the reflective polarizing plates of Examples 1 to 3 of the present invention have optical properties which are significantly superior to those of the reflective polarizing plates of Comparative Examples 1 and 2. Further, in Comparative Example 2 including the same number of layers as in Comparative Example 2, the comparative example 2 including the adhesive layer exhibited deterioration in optical properties. This is because the optical properties deteriorate due to the interference of the adhesion layers with the wavelength of the light.

Industrial applicability

The reflective polarizing plate according to the present invention has an excellent light modulation performance, and thus can be widely applied to the field requiring light modulation. In detail, the reflective polarizing plate of the present invention can be widely used in, for example, action Display, liquid crystal display and light-emitting diodes, projection displays, plasma displays, field emission displays, electroluminescent displays (ELD) and other flat panel display technologies that require high brightness liquid crystal display devices.

While the invention has been described in connection with the preferred embodiments of the present invention, it should be understood that Additions and replacements are possible.

50,52,53,60,61,62,63,67,68,69,70‧‧‧first component supply channel

51,54,55,56,57,58,59,64,65,66,71,72,73‧‧‧second component supply channel

74‧‧‧First Passage

75‧‧‧second channel

76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93‧‧

94‧‧‧Export

S1‧‧‧ first distribution board

S2‧‧‧Second distribution board

S3‧‧‧ third distribution board

S4‧‧‧ fourth distribution board

Claims (14)

A method for manufacturing a multilayer reflective polarizing plate, comprising: a core layer comprising a first component and a second component which are alternately stacked, and further, the manufacturing method comprises the following steps (1) supplying a first component material, a second component material, and a surface layer material to each of the extrusion units; (2) the first and second component materials to be sent by the extrusion units Injecting a plurality of slit-type extrusion dies having a component supply passage of 100 or more layers, thereby forming two or more multilayer composites each including a plurality of overlapping layer units of the first and second components alternately stacked And each of the overlapping layer units includes a first component and a second component, and the two or more multilayer composites are different in terms of an average optical thickness of the one of the plurality of overlapping layer units, To respectively reflect a plurality of transverse waves (S waves) having different wavelengths; (3) stacking the two or more multilayer composites to form a core layer; and (4) expanding the core layer through a flow control unit, wherein The method further includes the following steps: at this step (3) Between the step (4), laminating the surface layer material on at least one surface of the core layer formed in the step (3); or, the method further comprises the following step: in the step (3), The surface layer material is laminated on at least one surface of the core layer. The method of claim 1, wherein four or more sea-island type complexes are formed in the step (2). The method of claim 1, wherein the plurality of slit-type extrusion molding systems are integrated. The method of claim 1, further comprising the step of: between the step (1) and the step (2), the first component material sent by the corresponding one of the pressing units The different slit-type extrusion dies in the slit-type extrusion dies are injected through a plurality of first pressing units having different displacements so that the multi-layered composites have different average optical thicknesses. The method of claim 1, further comprising the step of: between the step (1) and the step (2), feeding a second component material corresponding to one of the extrusion units to the extrusion unit The different slit-type extrusion dies in the slit-type extrusion dies are injected through a plurality of second pressing units having different displacements so that the multi-layered composites have different average optical thicknesses. The method of claim 1, wherein each slit-type extrusion die comprises at least one distribution plate, and the at least one distribution plate has a plurality of slits for supplying and dispensing the first and second component materials, and The slits of the distribution plates of the slit-type extrusion dies have different widths for producing different multilayer composites through the slit-type extrusion dies. The method of claim 1, wherein each slit-type extrusion die comprises a plurality of layers equal to or greater than 200 component supply channels. Such as the method of claim 1, wherein each slit type extrusion die package The majority of the layers are equal to or greater than the 300 component supply channels. The method of claim 1, wherein the optical thickness of the repeating layer units included in each of the multilayer composites has a thickness deviation equal to or less than 20% with respect to an average optical thickness of the overlapping layer units. The method of claim 1, wherein the optical thickness of the repeating layer units included in each of the multilayer composites has a thickness deviation of equal to or less than 15% with respect to an average optical thickness of the overlapping layer units. The method of claim 1, wherein the average optical thickness of the repeating unit in the multilayer composite has a thickness deviation equal to or greater than 10%. An apparatus for manufacturing a multilayer reflective polarizing plate, comprising: a core layer having one of a first component and a second component alternately stacked, and one of laminating at least one surface of the core layer a surface layer, in addition, the apparatus comprises: three or more extrusion units, and one of the first component materials and one of the second component materials and a surface layer material are respectively supplied to the three or three The above extrusion unit; a rotating block comprising a plurality of materials for receiving the first component material sent by the corresponding one of the pressing units and being sent by the corresponding one of the pressing units a slit type extrusion die of a second component material having a component supply passage of 100 or more layers, thereby forming two or two of a plurality of overlapping layer units each including the first and second components alternately stacked The above multilayer composites, and the repeating layer units of the multilayer composites have different average optical thicknesses to reflect a plurality of transverse waves (S-waves) of a desired wavelength; a collecting block for stacking the two or more multi-layered composites sent by the rotating block, thereby forming the core layer; and a flow control unit for expanding The collecting layer sends out the core layer, wherein the device further comprises: an extrusion unit, and a surface layer material is separately supplied to the pressing unit; and a feeding block is supplied to the surface layer material The pressing unit is in communication to laminate a surface layer on at least one surface including a structure of one of the multilayer composites fed from the rotating block. An apparatus for manufacturing a multilayer reflective polarizing plate, comprising: a core layer having one of a first component and a second component alternately stacked, and one of laminating at least one surface of the core layer a surface layer, the device comprising: three or more extrusion units, and one of the first component materials and one of the second component materials and a surface layer material are respectively supplied to the three or more a rotating unit; a rotating block comprising a plurality of first component materials for receiving the corresponding one of the pressing units and a corresponding one of the pressing units a slit type extrusion die of a two-component material having a component supply passage of 100 or more layers, thereby forming two or more of a plurality of overlapping layer units each including the first and second components alternately stacked Multi-layer composite, and the multi-layer composite The re-coating units have different average optical thicknesses for reflecting a plurality of transverse waves (S-waves) having a desired wavelength; and a collecting block for laminating the two or more multi-layered composites sent by the rotating block, Forming the core layer; and a flow control unit for expanding the core layer sent by the collecting block, wherein the device further comprises: a pressing unit, and a surface layer material is separately supplied to the pressing unit, and The extrusion die can be in communication with the collection block to laminate a surface layer on at least one surface of the core layer. The apparatus of claim 12 or 13, wherein the rotating block comprises: a first pressurizing unit for supplying the first component material sent from the pressing unit supplied with the first component material to the One of the slit-type extrusion dies corresponding to the slit-type extrusion die; and a second pressing unit for supplying the second component material sent from the extrusion unit supplied by the second component material to One of the slit type extrusion dies corresponds to a slit type extrusion die.