WO2017115957A1 - Film polarisant réfléchissant composite - Google Patents

Film polarisant réfléchissant composite Download PDF

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Publication number
WO2017115957A1
WO2017115957A1 PCT/KR2016/006933 KR2016006933W WO2017115957A1 WO 2017115957 A1 WO2017115957 A1 WO 2017115957A1 KR 2016006933 W KR2016006933 W KR 2016006933W WO 2017115957 A1 WO2017115957 A1 WO 2017115957A1
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WIPO (PCT)
Prior art keywords
polarizing film
reflective polarizing
layer
light
reliability
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PCT/KR2016/006933
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English (en)
Korean (ko)
Inventor
배중석
김효석
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도레이케미칼 주식회사
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Priority to JP2018534749A priority Critical patent/JP6726282B2/ja
Publication of WO2017115957A1 publication Critical patent/WO2017115957A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3066—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state involving the reflection of light at a particular angle of incidence, e.g. Brewster's angle

Definitions

  • the present invention relates to a composite reflective polarizing film, and more particularly, to minimize light loss, to have excellent luminance, and to be excellent in reliability in a high temperature / humid environment in a module manufacturing process such as a display or in use.
  • the present invention relates to a composite reflective polarizing film which is excellent in color and remarkably excellent in color reproducibility.
  • LCD liquid crystal display
  • PDP plasma display
  • FED field emission display
  • ELD electroluminescent display
  • liquid crystal displays arrange a liquid crystal and an electrode matrix between a pair of light absorbing optical films.
  • the liquid crystal portion has an optical state that is changed accordingly by moving the liquid crystal portion by an electric field generated by applying a voltage to two electrodes. This process displays an image of a 'pixel' carrying information using polarization in a specific direction.
  • liquid crystal displays include a front optical film and a back optical film that induce polarization.
  • the optical film used in such a liquid crystal display does not necessarily have high utilization efficiency of light emitted from the backlight. This is because more than 50% of the light irradiated from the backlight is absorbed by the back side optical film (absorption type polarizing film). Therefore, in order to increase utilization efficiency of backlight light in a liquid crystal display, a reflective polarizing film may be provided between the optical cavity and the liquid crystal assembly.
  • the reflective polarizing film prevents optical degradation due to light loss and at the same time, the reflective polarizing film is slimmed down to the thickness of the slimming display panel, and in the direction of simplifying the manufacturing process, minimizing defects in the manufacturing process, and improving productivity and economy. Ongoing research is ongoing.
  • FIG. 1 is a view showing the optical principle of a conventional reflective polarizing film. Specifically, P polarization of the light from the optical cavity to the liquid crystal assembly passes through the reflective polarization film to the liquid crystal assembly, and S polarization is reflected from the reflective polarization film to the optical cavity, and then polarized light on the diffuse reflection surface of the optical cavity. The direction is reflected in a randomized state and then transmitted back to the reflective polarization film, so that the S polarization is converted into P polarization that can pass through the polarizer of the liquid crystal assembly, and then passed through the reflective polarization film to be transferred to the liquid crystal assembly.
  • the selective reflection of S-polarized light and the transmission of P-polarized light with respect to incident light of the reflective polarizing film have a refractive index between the optical layers in a state where an optical layer on a plate having anisotropic refractive index and an optical layer on a plate having an isotropic refractive index are alternately stacked. It is made by the optical thickness setting of each optical layer and the refractive index change of the optical layer according to the difference and the stretching process of the stacked optical layers.
  • the light incident on the reflective polarizing film passes through each optical layer, and the P polarized light is repeatedly transmitted to the liquid crystal assembly.
  • the reflected S-polarized light as described above the polarized state is reflected in a randomized state on the diffuse reflection surface of the optical cavity is transmitted to the reflective polarizing film again. As a result, power loss can be reduced together with the loss of light generated from the light source.
  • the conventional reflective polarizing film has an optical thickness and a refractive index between the optical layers that can be optimized for selective reflection and transmission of incident polarization by extending and stacking an isotropic optical layer and anisotropic optical layer on a plate having different refractive indices. Since it was produced, there was a problem that the manufacturing process of the reflective polarizing film was complicated. In particular, since each optical layer of the reflective polarizing film has a flat plate structure, the P-polarized light and the S-polarized light must be separated to correspond to a wide range of incidence angles of incident polarization, so that the number of optical layers is excessively increased and the production cost is exponentially increased. There was a growing problem. In addition, due to the structure in which the number of laminated layers of the optical layer is excessively formed, there is a problem that the optical performance decrease due to light loss.
  • FIG. 2 is a cross-sectional view of a conventional multilayer reflective polarizing film (DBEF).
  • DBEF multilayer reflective polarizing film
  • skin layers 9 and 10 are formed on both surfaces of the substrate 8.
  • the substrate 8 is divided into four groups (1, 2, 3, 4), each group having an isotropic layer and an anisotropic layer alternately forming about 200 layers.
  • separate adhesive layers 5, 6, 7 for bonding them are formed between the four groups 1, 2, 3, 4 forming the substrate 8.
  • each group since each group has a very thin thickness of about 200 layers, each group may be damaged when co-extrusion of these groups individually, so the groups often include a protective layer (PBL). In this case, there is a problem that the thickness of the substrate becomes thick and the manufacturing cost increases.
  • PBL protective layer
  • the thickness of the substrate is limited for slimming, and thus, when the adhesive layer is formed on the substrate and / or the skin layer, the substrate is reduced by the thickness thereof. there was. Furthermore, since the inside of the substrate and the substrate and the skin layer are bonded by an adhesive layer, there is a problem in that an interlayer peeling phenomenon occurs when an external force is applied, when a long time passes, or when the storage location is poor. In addition, in the process of attaching the adhesive layer, not only the defect rate is excessively high but also there is a problem in that offset interference with the light source occurs due to the formation of the adhesive layer.
  • Skin layers 9 and 10 are formed on both sides of the substrate 8, and separate adhesive layers 11 and 12 are formed to bond them between the substrate 8 and the skin layers 9 and 10.
  • peeling may occur due to incompatibility, and the birefringence of the stretching axis during the stretching process is performed because the crystallinity is about 55%. High risk of occurrence. Accordingly, in order to apply the polycarbonate sheet of the non-stretching process, the adhesive layer was inevitably formed. As a result, the addition of the adhesive layer process results in a decrease in yield due to external foreign matters and process defects.
  • a reflective polarizing film in which a dispersion in which a birefringent polymer extending in a longitudinal direction is arranged inside a substrate rather than a multilayer reflective polarizing film to achieve the function of the reflective polarizing film is dispersed is proposed.
  • 3 is a perspective view of a reflective polarizing film 20 including a rod-shaped polymer, in which the birefringent polymer 22 extending in the longitudinal direction is arranged in one direction in the substrate 21.
  • FIG. 4 is a cross-sectional view of a birefringent island-in-the-sea yarn included in the substrate, and the birefringent island-in-the-sea yarn may generate a light modulation effect at an optical modulation interface between the inner and sea portions of the inner portion, and thus, a very large number such as the birefringent polymer described above. Optical properties can be achieved even if the island-in-the-sea yarns are not disposed.
  • the birefringent island-in-the-sea yarn is a fiber
  • problems of compatibility, ease of handling, and adhesion with a substrate which is a polymer have arisen.
  • the circular shape due to the circular shape, light scattering is induced, and thus the reflection polarization efficiency of the visible wavelength is reduced, and the polarization characteristic is lowered compared to the existing products, thereby limiting the luminance improvement.
  • the voids cause the optical leakage due to light leakage, that is, light loss.
  • a limitation occurs in the reflection and polarization characteristics due to the limitation of the layer configuration due to the organization of tissue in the form of a fabric.
  • the dispersion type reflective polarizing film the visible line is observed due to the space between the layers and the space between the dispersions.
  • the polarized polarizing films proposed to date have all disadvantages.
  • the multilayered polarizing polarizing films have a high manufacturing cost and have a problem of increasing the product cost for use in actual products.
  • a polymer dispersed reflective polarizing film in which a polymer is dispersed in a substrate may be more preferable. .
  • the polymer dispersed reflective polarizer film developed to date has many defects in appearance as the base material is translucent and foreign material is shown on the exterior of the film, and the light leakage, visible light phenomenon, narrow viewing angle are narrow, and the light loss cannot be minimized. There was a problem that is lowered.
  • the present invention has been made to solve the above-mentioned problems, minimizes light loss, has excellent brightness, and has excellent reliability and excellent film appearance quality even in a module manufacturing process such as a display or a high temperature / humid environment during use.
  • the present invention provides a method for producing a composite reflective polarizing film that is remarkably excellent in color reproducibility.
  • a composite reflective polarizing film comprising a reflective polarizing film in which a polymer is dispersed in the substrate, the composite reflective polarizing film is a light diffusion layer formed on the upper surface of the reflective polarizing film; And a reliability support layer formed on the lower surface of the reflective polarizing film, and provides the composite reflective polarizing film, which satisfies the following conditions (1) and (2).
  • the reliability support layer has a coefficient of thermal expansion of 4 to 35 ⁇ m / m ⁇ ° C in the temperature range of 70 to 80 ° C.
  • the haze value of the composite reflective polarizing film is 65% or more.
  • the light diffusion layer may include at least one micropattern selected from the group consisting of a prism, a lenticular, a microlens, a triangular pyramid and a pyramid pattern; And bead coating layers; It may include any one or more of.
  • the micropattern may include a micro lens.
  • the reliability support layer may be a polyester film stretched in at least one direction.
  • the reliability support layer may have a thickness of 10 ⁇ 600 ⁇ m.
  • the reliability support layer may satisfy a thermal expansion coefficient of 10 to 25 ⁇ m / m ⁇ ° C at a temperature range of 70 to 80 ° C.
  • the reflective polarizing film includes a substrate and a plurality of dispersions for transmitting the first polarized light that is irradiated from the outside and reflected inside the substrate and reflecting the second polarized light
  • the plurality of dispersions have a refractive index different from the substrate in at least one axial direction, and at least 80% of the plurality of dispersions contained in the substrate have an aspect ratio of the short axis length to the major axis length based on the vertical cross section in the longitudinal direction.
  • the dispersion having an aspect ratio of less than or equal to 1/2 is included in at least three groups according to the cross-sectional area, the dispersion cross-sectional area of the first group of the group is 0.2 ⁇ 2.0 ⁇ m 2 , dispersion of the cross-sectional area is less than 2 5.0 ⁇ m from 2.0 ⁇ m 2, greater than the cross-sectional area of the dispersion according to the third group is 2 or less from 10.0 ⁇ m 5.0 ⁇ m than 2, the dispersion of the first group to third group is randomly It may be listed.
  • a core layer comprising a substrate and a plurality of dispersions contained in the substrate; And an integrated skin layer formed on at least one surface of the core layer.
  • the haze value of the composite reflective polarizing film under the above condition (2) may be 73% or more.
  • the present invention is a composite reflective polarizing film comprising a reflective polarizing film in which a polymer is dispersed in the substrate, the composite reflective polarizing film comprises a reliability support layer formed on the upper surface of the reflective polarizing film; And a light diffusion layer formed on an upper surface of the reliability support layer, and provides the composite reflective polarizing film, which satisfies the following conditions (1) and (2).
  • Reliability support layer has a coefficient of thermal expansion of 4 to 35 ⁇ m / m ⁇ °C in the temperature range of 70 ⁇ 80 °C
  • the haze value of the composite reflective polarizing film is 65% or more.
  • the present invention is a composite reflective polarizing film comprising a reflective polarizing film in which a polymer is dispersed in the substrate, the composite reflective polarizing film comprises a light diffusion layer formed on the upper surface of the reflective polarizing film; And a reliability support layer formed on an upper surface of the light diffusion layer, and provides a composite reflective polarizing film, which satisfies the following conditions (1) and (2).
  • the reliability support layer has a thermal expansion coefficient of 4 to 35 ⁇ m / m ⁇ ° C at a temperature range of 70 to 80 ° C.
  • the haze value of the composite reflective polarizing film is 65% or more.
  • the present invention is a composite reflective polarizing film comprising a reflective polarizing film in which a polymer is dispersed in the substrate, the composite reflective polarizing film comprises a light diffusion layer formed on the upper surface of the reflective polarizing film; A reliability support layer formed on a lower surface of the reflective polarizing film; And a light collecting layer formed on the lower surface of the reliability support layer, and provides the composite reflective polarizing film, which satisfies the following conditions (1) and (2).
  • the reliability support layer has a thermal expansion coefficient of 4 to 35 ⁇ m / m ⁇ ° C at a temperature range of 70 to 80 ° C.
  • the haze value of the composite reflective polarizing film is 65% or more.
  • the light collecting layer may include a support part and a prism pattern part formed on the support part, and the prism pattern part may be formed to face the lower surface of the reliability support layer.
  • the support may have a thickness of 10 ⁇ 300 ⁇ m.
  • the present invention is a composite reflective polarizing film comprising a reflective polarizing film in which a polymer is dispersed in the substrate, the composite reflective polarizing film comprises a light diffusion layer formed on the upper surface of the reflective polarizing film; A reliability support layer formed on a lower surface of the reflective polarizing film; And a support part, the light collecting layer formed on a lower surface of the reliable support layer, wherein a value of Equation 1 below about the thickness of the reflective polarizing film, the thickness of the reliable support layer, and the support part thickness of the light collecting layer is 0.3 to 2.0. It provides a composite reflective polarizing film, characterized in that.
  • the value of Equation 2 for the thickness of the reliability support layer and the thickness of the support portion of the light collecting layer may be 0.25 to 4.
  • the present invention is a composite reflective polarizing film comprising a reflective polarizing film in which a polymer is dispersed in the substrate, the composite reflective polarizing film is a light diffusion layer formed on the upper surface of the reflective polarizing film; A reliability support layer formed on a lower surface of the reflective polarizing film; And a multi-functional layer formed under the reliability support layer and guiding and condensing light irradiated from the light source, wherein the composite reflective polarizing film satisfies the following conditions (1) and (2).
  • Reliability support layer has a coefficient of thermal expansion of 4 to 35 ⁇ m / m ⁇ °C in the temperature range of 70 ⁇ 80 °C
  • the haze value of the composite reflective polarizing film is 65% or more.
  • the multi-functional layer comprises a fine pattern layer for condensing light emitted from a light source; And a light guide layer formed under the micropattern layer and supporting the micropattern layer and guiding light emitted from the light source.
  • the present invention provides a backlight unit including the composite reflective polarizing film according to the present invention described above.
  • the present invention provides a liquid crystal display device including the backlight unit according to the present invention.
  • dispersion has birefringence means that when light is irradiated on a fiber having a different refractive index depending on the direction, the light incident on the dispersion is refracted by two or more lights having different directions.
  • isotropic means that the refractive index is constant regardless of the direction when light passes through the object.
  • anisotropy means that the optical properties of the object vary according to the direction of light, and the anisotropic object has birefringence and corresponds to isotropy.
  • the term "light modulation” means that the irradiated light is reflected, refracted, scattered, or the intensity of the light, the period of the wave, or the property of the light is changed.
  • spect ratio refers to the ratio of the short axis length to the long axis length relative to the vertical section in the longitudinal direction of the dispersion.
  • the spatially relative terms “below”, “beneath”, “lower”, “above”, “upper” and the like As shown in the figure, it can be used to easily describe the correlation between one component and the other components. Spatially relative terms are to be understood as including terms in different directions of components in use or operation in addition to the directions shown in the figures. For example, when flipping a component shown in the drawing, a component described as “below” or “beneath” of another component may be placed “above” the other component. Can be. Thus, the exemplary term “below” may include both the direction below and above. The components can be oriented in other directions as well, so that spatially relative terms can be interpreted according to the orientation.
  • the method of manufacturing a composite reflective polarizing film according to the present invention minimizes light loss, and has excellent brightness, and at the same time, appearance changes such as film crying or wrinkles occur in a module manufacturing process such as a display or a high temperature / humid environment during use. It is excellent in reliability, and is excellent in quality due to no defects such as appearance of light, light leakage and bright lines in the appearance of the film.
  • FIG. 1 is a schematic view illustrating the principle of a conventional reflective polarizing film.
  • DBEF multilayer reflective polarizing film
  • FIG 3 is a perspective view of a reflective polarizing film including a rod-shaped polymer.
  • FIG. 4 is a cross-sectional view showing a path of light incident on a birefringent island-in-the-sea yarn used in a reflective polarizing film.
  • FIG. 5 is a cross-sectional view of a composite reflective polarizing film according to a first embodiment of the present invention.
  • FIG. 6 is a cross-sectional view of a reflective polarizing film in which a dispersion is randomly dispersed in a substrate according to a preferred embodiment of the present invention.
  • Figure 7 is a vertical cross-sectional view in the longitudinal direction of the dispersion used in one preferred embodiment of the present invention.
  • FIG. 8 is a perspective view of a reflective polarizing film according to an exemplary embodiment of the present invention.
  • 9 to 14 are perspective views of the composite reflective polarizing film according to a preferred embodiment of the present invention.
  • 15 to 17 are cross-sectional views of the light diffusing layer in the composite reflective polarizing film according to a preferred embodiment of the present invention.
  • FIG. 18 is a cross-sectional view of a composite reflective polarizing film according to a preferred embodiment of the present invention.
  • FIG. 19 is a cross-sectional view of a coat-hanger die, which is a kind of preferred flow control unit that may be applied to the present invention
  • FIG. 20 is a side view of FIG.
  • FIG. 21 is a schematic diagram of a micropattern forming process according to an exemplary embodiment of the present invention
  • FIG. 22 is a cross-sectional view illustrating a detailed structure of the molding part of FIG. 21.
  • 23 and 24 are schematic views of a micropattern forming process according to another preferred embodiment of the present invention.
  • 25 is a cross-sectional view of the laminated reflective film and the reliability support layer according to a preferred embodiment of the present invention.
  • 26 is a cross-sectional view of a composite reflective polarizing film according to a second preferred embodiment of the present invention.
  • FIG. 27 is a perspective view of a light collecting layer included in a preferred embodiment of the present invention.
  • 28 and 29 are schematic views of a process of forming a fine pattern of a light collecting layer according to a preferred embodiment of the present invention.
  • FIG. 30 is a cross-sectional view of a liquid crystal display according to an exemplary embodiment of the present invention.
  • 31 is a liquid crystal display device employing a complex reflective polarizing film according to an embodiment of the present invention.
  • FIG. 32 is a schematic diagram of a device for producing a plate-shaped polymer dispersed reflection polarization film included in a preferred embodiment of the present invention.
  • FIG. 33 is a perspective view illustrating a coupling structure of the distribution plates of the sea-island type extruded molds in which a plate-shaped polymer dispersed reflection polarization film included in a preferred embodiment of the present invention may be manufactured.
  • FIG. 34 is a cross-sectional view of a plate-shaped polymer dispersed reflection polarization film according to an embodiment of the present invention.
  • the polymer dispersed reflection polarizing film has a high defect rate of appearance as the base material is translucent and foreign matter is displayed on the appearance of the film, the light leakage, visible light phenomenon, narrow viewing angle is narrow, and the light loss cannot be minimized so that the luminance is low.
  • a composite reflective polarizing film including a reflective polarizing film in which a polymer is dispersed in a substrate, wherein the composite reflective polarizing film comprises: a light diffusion layer formed on an upper surface of the reflective polarizing film; And a reliability support layer formed on the lower surface of the reflective polarizing film, and the solution of the above-described problems was sought by providing a composite reflective polarizing film, which satisfies the following conditions (1) and (2). This minimizes light loss, and has excellent brightness and excellent reliability due to no change in appearance such as film crying or wrinkles even in module manufacturing process such as display or high temperature / high humidity during use. There is no defect such as vision, light leakage, and dotted lines, so the quality is excellent, and color reproducibility can be remarkably improved.
  • the reliability support layer has a thermal expansion coefficient of 4 to 35 ⁇ m / m ⁇ ⁇ in a temperature range of 70 to 80 ° C, and (2) a haze value of the composite reflective polarizing film is 65% or more.
  • the complex reflective polarization film 1000 may include a light diffusion layer 100 formed on an upper surface of the reflective polarization film 200 and a lower surface of the reflective polarization film 200. It may include a reliability support layer 300 formed in, and may include a first primer layer 400 for strengthening the adhesion between the reflective polarizing film 200 and the reliability support layer 300.
  • the reflective polarizing film 200 will be described.
  • the reflective polarizing film 200 may be a conventional polymer dispersed reflective polarizing film in which a polymer is dispersed in a substrate.
  • the conventional polymer spray type reflective polarizing film may be a known conventional reflective polarizing film including a rod-shaped polymer as shown in FIG. 3.
  • the present invention is particularly limited in terms of the shape of the polymer dispersed in the substrate, the number of polymers, the dispersion form, and the like. I never do that.
  • the reflective polarizing film in which the polymer is dispersed in the conventional substrate has a problem in that light leakage, visible light phenomenon, narrow viewing angle are narrow, and light loss cannot be minimized.
  • the reflective polarizing film includes a substrate and a plurality of dispersions for transmitting the first polarized light emitted from the outside and reflecting the second polarized light, which are included inside the substrate, Dispersions differ in refractive index in at least one axial direction from the substrate, and at least 80% of the plurality of dispersions contained in the substrate have an aspect ratio of the short axis length to the major axis length based on the vertical cross section in the longitudinal direction Dispersions of less than 1/2, the aspect ratio of less than 1/2 is included in at least three groups according to the cross-sectional area, the dispersion cross-sectional area of the first group of the group is 0.2 ⁇ 2.0 ⁇ m 2 , dispersion of the second group and the body cross-sectional area is less than 2 from 5.0 ⁇ m 2.0 ⁇ m 2, greater than the cross-sectional area of the dispersion according to the third group is 2 or less from 10.0 ⁇ m 5.0 ⁇ m than 2, the dispersion of the
  • the reflective polarizing film is included in the above-described substrate and the substrate, the reflective polarization comprising a plurality of dispersions satisfying the conditions according to the preferred embodiment of the present invention
  • the film may be a core layer, and may have a structure including an integrated skin layer formed on at least one surface of the core layer, and further include a skin layer to contribute to core layer protection.
  • the reflective polarizing film according to one embodiment not including the skin layer and the other embodiment including the skin layer may have a difference in use, and the reflective polarizing film including the skin layer is used in various general-purpose liquid crystal display devices such as displays. It may be preferable to use, and in the case of a portable liquid crystal display device, for example, a portable electronic device, a smart electronic device, a smart phone, it may be preferable to use a reflective polarizing film that does not include a skin layer, but is not limited thereto.
  • the composite reflective polarizing film according to the present invention can achieve the purpose of core layer protection even if it does not have a skin layer for core layer protection by including a reliability support layer described later on one surface of the reflective polarizing film.
  • a core layer 210 in which a plurality of dispersions 212 to 217 are randomly dispersed and arranged inside the substrate 211 and a skin layer 220 integrally formed on at least one surface of the core layer are provided. It may be implemented to include a reflective polarizing film.
  • 80% or more of the plurality of dispersions included in the substrate may have an aspect ratio of the short axis length to the long axis length of the core layer 210 based on the vertical cross section in the longitudinal direction, and more preferably, 90% or more may satisfy the aspect ratio value of 1/2 or less.
  • Figure 7 is a vertical cross section in the longitudinal direction of the dispersion used in a preferred embodiment of the present invention, when the long axis length is a and the short axis length b is the length of the long axis length (a) and short axis length (b)
  • the relative length ratio may be less than or equal to 1/2.
  • the long axis length (a) is 2
  • the short axis length (b) may be less than or equal to 1 that is 1/2. If the dispersion having a ratio of the short axis length to the long axis length of more than 1/2 is included in 20% or more of the total number of dispersions, it is difficult to achieve the desired optical properties.
  • Dispersions having an aspect ratio of 1/2 or less may include three or more groups having different cross-sectional areas.
  • the first group of dispersions 202 and 203 having the smallest cross-sectional area
  • the second group of dispersions 204 and 205 having an intermediate cross-sectional area
  • the third group having the largest cross-sectional area ( All of the dispersions of 206 and 207 are randomly dispersed.
  • the cross-sectional area of the first group is 0.2 to 2.0 ⁇ m 2
  • the cross-sectional area of the second group is greater than 2.0 ⁇ m 2 to 5.0 ⁇ m 2
  • the cross-sectional area of the third group is greater than 5.0 ⁇ m 2 to 10.0 ⁇ m 2 or less.
  • the dispersion of one group, the dispersion of the second group and the dispersion of the third group are randomly arranged. If the dispersions of any one group of the first to third groups are not included, it is difficult to achieve the desired optical properties (see Table 1).
  • the number of dispersions of the third group of the dispersions having an aspect ratio of 1/2 or less may be 10% or more. If less than 10%, the optical properties may be insufficient. More preferably, the number of dispersions corresponding to the first group among the dispersions having an aspect ratio of 1/2 or less may satisfy 30 to 50%, and the number of dispersions corresponding to the third group may be 10 to 30%. This can improve optical properties (see Table 1).
  • the number of dispersions of the first group / the number of dispersions of the third group has a value of 3 to 5 may be very advantageous to maximize the optical properties (see Table 1).
  • the number of dispersions corresponding to the second group among the dispersions having an aspect ratio of 1/2 or less may satisfy 25 to 45%.
  • the dispersion outside the range of the cross-sectional area of the first to third dispersion may be included as a residual amount in the dispersion having the aspect ratio of 1/2 or less.
  • FIG. 8 is a perspective view of a reflective polarizing film included in a preferred embodiment of the present invention, wherein a plurality of random dispersions 208 are elongated in a longitudinal direction in a substrate 201 of a core layer 210 and have a skin layer. 220 is formed on and / or under the core layer 210.
  • the random dispersion 208 may each extend in various directions, but it is preferable to extend in parallel in any one direction, and more preferably in a direction perpendicular to light irradiated from an external light source. Stretching parallel to the trunk is effective to maximize the light modulation effect.
  • a birefringent interface may be formed between the dispersion (first component) and the substrate (second component) included in the substrate.
  • the magnitude of the substantial coincidence or mismatch of the refractive indices along the X, Y, and Z axes in the space between the substrate and the dispersion is the scattering of the polarized light along that axis. Affects the degree. In general, the scattering power varies in proportion to the square of the refractive index mismatch. Thus, the greater the degree of mismatch in refractive index along a particular axis, the more strongly scattered light polarized along that axis.
  • the light polarized along that axis is scattered to a lesser extent. If the refractive index of the substrate along a certain axis substantially matches the refractive index of the dispersion, incident light polarized with an electric field parallel to this axis passes through the dispersion without scattering regardless of the size, shape and density of the portion of the dispersion. something to do. Also, when the refractive indices along that axis are substantially coincident, the light beam passes through the object without being substantially scattered.
  • the first polarized light (P wave) is transmitted without being affected by the birefringent interface formed at the boundary between the substrate and the dispersion, while the second polarized light (S wave) is formed at the boundary between the substrate and the dispersion.
  • the modulation of the light occurs due to the interface.
  • the P wave is transmitted, and the S wave generates light modulation such as scattering and reflection of light, and thus, polarization is separated.
  • the substrate and the dispersion may cause a photomodulation effect by forming a birefringent interface
  • the dispersion when the substrate is optically isotropic, the dispersion may have birefringence and conversely, when the substrate is optically birefringent
  • the dispersion may have optical isotropy.
  • the refractive index of the dispersion is nX 1 in the x-axis direction
  • the refractive index in the y-axis direction is nY 1 and the refractive index in the z-axis direction is nZ 1
  • the refractive index of the substrate is nX 2 , nY 2 and nZ 2
  • In-plane birefringence between nX 1 and nY 1 may occur.
  • At least one of the X, Y, and Z axis refractive indices of the substrate and the dispersion may be different, and more preferably, the difference in refractive index with respect to the Y and Z axis directions is 0.05 or less when the extension axis is the X axis.
  • the difference in refractive index with respect to the X-axis direction may be 0.1 or more. On the other hand, if the difference in refractive index is 0.05 or less, it is usually interpreted as a match.
  • the thickness of the core layer is preferably 20 to 350 ⁇ m, more preferably 50 to 250 ⁇ m, but is not limited thereto. Specific uses and inclusions of the skin layer and thickness of the skin layer Accordingly, the thickness of the core layer can be designed differently. In addition, the total number of dispersions may be 25,000,000 to 80,000,000 when the thickness of the substrate is 120 ⁇ m based on 32 inches, but is not limited thereto.
  • the skin layer 220 that can be included in at least one surface of the core layer will be described.
  • the skin layer component may be used a component that is commonly used, and can be used without limitation as long as it is commonly used in a reflective polarizing film, preferably polyethylene naphthalate (PEN), copolyethylene 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), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene Vinyl acetate (EVA), polyamide (PA), polyacetal (POM), phenol, epoxy (EP), urea (UF), melanin (MF), unsaturated polyester (UP), silicone (SI)
  • the thickness of the skin layer may be 30 ⁇ 500 ⁇ m, but is not limited thereto.
  • the skin layer is integrally formed between the core layer 210 and the skin layer 220.
  • the skin layer of the present invention can be stretched in at least one axial direction, unlike when the unstretched skin layer is bonded after the conventional core layer is stretched. .
  • the surface hardness is improved compared to the unstretched skin layer, thereby improving scratch resistance and heat resistance.
  • the light diffusing layer 100 may improve the light collecting effect, prevent diffuse reflection on the surface, and significantly increase the brightness, and increase the haze value of the complex reflective polarizing film through scattering of light, thereby causing foreign objects to be displayed in the film. It can minimize appearance defects.
  • the light diffusion layer 100 may be formed on the reflective polarization film 200 or on an adhesive layer (not shown) formed on the reflective polarization film 200.
  • the light diffusion layer 100 may include a fine pattern.
  • the micropattern is not particularly limited as long as the micropattern is a micropattern capable of simultaneously improving luminance, light converging effect, and haze value of the complex reflective polarizing film, but more preferably, the micropattern includes a prism, a lenticular, a microlens, It may include any one or more patterns selected from the group consisting of a triangular pyramid and a pyramid pattern, each of them may be formed by forming a pattern alone or in combination, more preferably any one of lenticular, micro lens, prism It may be the above, and more preferably may be a micro lens that can satisfy all the physical properties at the same time.
  • Figure 9 is a perspective view of a composite reflective polarizing film according to an embodiment of the present invention
  • the reflective polarizing film 200 is a plurality of dispersions are extended in the longitudinal direction inside the substrate and these core layer 210 Form.
  • each of the dispersions may be elongated in various directions, but is preferably advantageously extended in parallel in one direction, more preferably in parallel to the elongated bodies in a direction perpendicular to the light irradiated from an external light source. Stretching is effective to maximize the light modulation effect.
  • the light diffusion layer 100 formed on the reflective polarization film 200 may perform an improved light condensing function and a brightness enhancement function by including a fine pattern
  • FIG. 9 is a light diffusion layer 110 including a lenticular pattern. Indicates.
  • the height (h) of the lenticular may be 10 ⁇ 50 ⁇ m. If the height of the lenticular pattern is less than 10 ⁇ m, it may be difficult to implement the pattern. If the height of the lenticular pattern exceeds 50 ⁇ m, the luminance may decrease due to an increase in total reflection of light.
  • the pitch of the lenticular may be 20 ⁇ 100 ⁇ m. If the pitch of the lenticular pattern is less than 20 ⁇ m, the condensing effect of the lens shape is somewhat decreased due to the increase of the valley portion of the film per unit area, and the limitation of the precision of the shape processing and the pattern shape are too narrow may cause a problem of difficult to implement the pattern. If the thickness exceeds 100 ⁇ m, the possibility of moiré between the pattern structure and the panel becomes very large.
  • the ratio of the long axis / short axis (b / a) may satisfy 1.0 to 3.0. If the ratio of the long axis / short axis d / c is out of the above range, a problem may occur in that the concealment efficiency of light on the light passing through the birefringent polarization layer is lowered.
  • the tangential angle ⁇ at both ends of the lower end of the lens must satisfy 30 to 80 °.
  • the concealment efficiency of the bright line is inferior, and when ⁇ is larger than 80 °, there is a problem that the production of the lens pattern becomes difficult.
  • the cross-sectional shape of the lenticular lens is a triangle, it is preferable that the vertex angle ⁇ satisfies 90 to 120 ° for the concealed light effect.
  • the lenticular shape may be formed in a pattern having the same height and pitch as illustrated in FIG. 9, or the lenticular patterns 111 having different height and pitch may be mixed as illustrated in FIG. 10.
  • Figure 11 is a perspective view of a composite reflective polarizing film according to a preferred embodiment of the present invention
  • the light diffusion layer 112 includes a micro lens pattern.
  • the height of the micro lens may be 10 ⁇ 50 ⁇ m. If the height of the micro-lens pattern is less than 10 ⁇ m may cause a problem of light condensing slightly and difficult to implement the pattern, if it exceeds 50 ⁇ m may cause a moire phenomenon, a problem that the pattern is visible on the image.
  • the diameter of the micro lens may be 20 ⁇ 100 ⁇ m. Preferably it may be 30 ⁇ 60 ⁇ m. While the appearance characteristics are good in the above range, the light condensing function and the light diffusing characteristics of the microlenses may be excellent and the actual manufacturing may be easy. If the diameter of the microlens pattern is less than 20 ⁇ m, a problem may occur that shows a low light collection efficiency for incident light incident from an invalid angle. If the diameter of the micro lens pattern exceeds 100 ⁇ m, the light collection efficiency for vertical light may be deteriorated. May occur.
  • the micro lens pattern may also be formed in a pattern having the same height and diameter as shown in FIG. 11, or the micro lens patterns 113 having different heights and diameters may be mixed as shown in FIG. 12. Since the microlens pattern has a large difference in optical characteristics according to the density of the lens and the degree of impregnation, the microlens pattern may have the highest density, and the degree of impregnation should be 1/2.
  • Figure 13 is a perspective view of a composite reflective polarizing film according to a preferred embodiment of the present invention
  • the light diffusion layer 113 includes a prism pattern.
  • the height (h) of the prism may be 10 ⁇ 50 ⁇ m. If the height of the prism pattern is less than 10 ⁇ m, the base film may be damaged by pressure when manufacturing the shape of the prism pattern part. If the height of the prism pattern exceeds 50 ⁇ m, the transmittance of light incident on the light source may be reduced.
  • the pitch of the prism may be 20 ⁇ 100 ⁇ m. If the pitch of the prism pattern is less than 20 ⁇ m, the engraving is not good, and the pattern layer implementation and manufacturing process may have complicated problems. If it exceeds 100 ⁇ m, the moire phenomenon is likely to occur, and the pattern may be seen on the image. .
  • the prism shape may be formed of the pattern 113 having the same height and pitch as shown in FIG. 13, or the prism patterns 115 having different height and pitch may be mixed as shown in FIG. 14.
  • the prism pattern may be formed of a material having a higher refractive index than that of the base film. When the refractive index of the base film is higher, a part of the light incident to the rear surface of the base film may be totally reflected at the surface of the prism pattern and thus may not be incident to the prism structure. Because.
  • the prism shape is a linear prism shape, the vertical cross section is triangular, and the triangle forms an angle of 60 to 110 ° with a vertex facing the lower surface.
  • the light diffusion layer including the above-described micropattern may be formed by curing including at least one polymer resin of photocurable polymer resin or thermosetting polymer resin.
  • Preferred examples of the polymer resin may be a polymer resin including a thermosetting or photocurable acrylic resin.
  • the type of the polymer resin used according to the shape of the micropattern specifically included in the light diffusion layer may be changed and used.
  • an unsaturated fatty acid ester, an aromatic vinyl compound, an unsaturated fatty acid and its derivatives, a vinyl cyanide compound such as methacrylonitrile, and the like can be used as the prism pattern, and specifically, a urethane acrylate and a methacrylic acrylic Rate resins and the like can be used.
  • the light diffusion layer may be formed of a material having a higher refractive index than the reflective polarizing film.
  • the light diffusion layer may include a bead coating layer.
  • the bead coating layer may be a coating layer (see FIG. 15) in which the beads 108 are included in the resin layer 107, and may be formed by embedding a portion of the beads on the resin layer (see FIG. 16).
  • the portion of the bead protruding different from FIG. 16 may be different from at least some of the beads, it may be configured such that the diameter of the included beads are also different.
  • beads may be attached to the upper surface of the resin layer and / or beads may be directly attached to the upper surface of the reflective polarizing film without the resin layer.
  • the diameter of the bead may be 0.1 ⁇ 100 ⁇ m, when the bead that satisfies this diameter can be implemented excellent optical properties.
  • the density of the beads and the spacing between the beads can be designed differently according to the desired optical properties, and are not particularly limited in the present invention. However, if the spacing between the beads is too small, light transmission characteristics may be disadvantageous as the number of beads included per unit area increases, so the spacing between the beads may be preferably about 1 ⁇ m or more, but is not limited thereto.
  • the beads may include at least one of organic beads and inorganic beads.
  • the organic beads may include acryl, styrene, melamine formaldehyde, propylene, ethylene, silicone, urethane, methyl (meth) acrylate, polycarbonate, and the like. Homopolymers, copolymers, etc. which are obtained using a monomer can be illustrated.
  • the inorganic beads include silica, zirconia, calcium carbonate, barium sulfate, titanium oxide, and the like.
  • the resin constituting the resin layer is not particularly limited in the present invention, but may be a UV curable material, and as (meth) acrylate or a polyfunctional (meth) acrylate monomer, for example, 2-hydroxyethyl (meth) acryl Rate, 2-hydroxypropyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, butoxy ethyl (meth) acrylate, ethyldiethylene glycol (meth) acrylate, 2-ethylhexyl (meth) acrylic Rate, cyclohexyl (meth) acrylate, phenoxyethyl (meth) acrylate, dicyclopentadiene (meth) acrylate, polyethylene glycol (meth) acrylate, polypropylene glycol (meth) acrylate, methyltriethylenedi Glycol (meth) acrylate, isobonyl (meth) acrylate, N-vinylpyr
  • a material having high lubricity may be applied.
  • a silicon based additive and a fluorine based additive may be applied.
  • a reactive monomer or a reactive oligomer having a silicone group for example, a silicone group-containing vinyl compound, a silicone group-containing (meth) acrylate compound, a (meth) acryloxy group-containing organosiloxane, silicone polyacrylate) Etc.
  • a reactive monomer or reactive oligomer having a fluorine group e.g., a fluoroalkyl group-containing vinyl compound, a fluoroalkyl group-containing (meth) acrylate compound, fluorine polyacrylate, etc.
  • a silicone group or a fluorine group A resin for example, polydimethylsiloxane, a fluoropolymer, etc.
  • the content ratio of the UV curable material and the additive may be in the range of 100: 0.001 weight ratio to 100: 10 weight ratio, and preferably 100: 0.01 weight ratio to 100: 5 weight ratio.
  • the UV curable material and additives may further include a photoinitiator.
  • the photoinitiator is one or more free radical initiators selected from benzyl ketals, benzoin ethers, acetophenone derivatives, ketoxime ethers, benzophenones, benzo or thioxanthone compounds, onium salts, ferrocenium salts ( ferrocenium salts, and one or more cationic initiators selected from diazonium salts, or mixtures thereof.
  • the degree of physical properties expressed in the composite reflective polarizing film through the light diffusion layer may vary depending on the specific shape of the micropattern. Specifically, when the micropattern is a prism and / or a lenticular shape, the light collecting effect may be further maximized. On the other hand, the haze value increase of the composite reflective polarizing film may be relatively lower than that of the microlens shape.
  • the haze value of the composite reflective polarizing film may be remarkably increased to realize a very good surface appearance quality, while the light transmittance may be remarkably reduced, so that light condensing effect and luminance Etc.
  • the optical properties may be significantly reduced in comparison with a fine pattern, preferably when the fine pattern is in the shape of a micro lens. Therefore, the shape of the light diffusing layer may be selected differently according to the desired physical properties.
  • the light diffusing layer may be used to express not only optical characteristics such as light condensing and luminance, but also surface appearance quality improvement by increasing the haze value of the composite reflective polarizing film. It may be more preferable to include the micro pattern of the micro lens shape.
  • an adhesive layer (not shown) may be selectively formed on the upper surface of the skin layer 220a of the reflective polarizing film 200. Through this, it is possible to improve the adhesion, appearance, and total light characteristics of the light diffusion layer 100.
  • Its material may be acrylic, ester, urethane, and the like, but is not limited thereto.
  • the adhesive layer may be formed thinner than other layers, and the thickness of the adhesive layer may be adjusted to improve light transmittance and to lower the reflectance.
  • the thickness of the adhesive layer may be 5nm to 300nm. If the thickness of the adhesive layer is less than 5nm, the adhesion between the reflective polarizing film and the light diffusing layer may be insignificant. If the thickness of the adhesive layer exceeds 300nm, staining or aggregation of molecules may occur during the adhesive treatment.
  • the reliability support layer 300 formed on the lower surface of the reflective polarizing film 200 will be described.
  • the reliability support layer 300 is a reflective polarizing film containing a polymer dispersed in the substrate to significantly improve the thermal reliability degradation generated in various processes for manufacturing a backlight unit, and further improves haze to appearance foreign matters or bright lines, etc. In addition, it is possible to minimize the reduction in luminance that may occur when a separate configuration is included to improve reliability while significantly improving the appearance defects.
  • the reliability of the composite reflective polarizing film is that the reflective polarizing film generally has a very high thermal expansion coefficient due to the characteristics of the material, so that the module manufacturing process of the composite reflective polarizing film, the backlight unit, etc. and / or the high temperature of the product using the same Due to the high temperature in a humid environment, the surface of the reflective polarizing film does not affect the appearance of wrinkles such as curtains, bends, and / or optical properties such as deterioration in brightness, and the appearance of wrinkles and bends due to the appearance of wrinkles. This means that there are no panel smears due to gaps between the peaks and valleys, and there is no appearance damage such that the reflective polarizing film is easily torn or damaged in the stretched direction when stretched on at least one axis. .
  • the reliability support layer according to the present invention is a condition (1) according to the present invention, the temperature of 70 ⁇ 80 °C
  • the thermal expansion coefficient should satisfy 4 to 35 ⁇ m / m ⁇ ° C in the interval, and preferably the thermal expansion coefficient may satisfy 10 to 25 ⁇ m / m ⁇ ° C in the temperature range of 70 to 80 ° C. As it satisfies this, even in the module manufacturing process of the composite reflective polarizing film and the backlight unit and / or the high temperature and high humidity environment of the product to which the same is applied, the appearance of wrinkles, bends, etc.
  • the excellent composite reflective polarizing film can have excellent reliability. If the above range is not satisfied, there may be a problem that the physical properties such as prevention of the desired optical properties, reliability and surface appearance defects may not be realized.
  • the thermal expansion coefficient is 35 ⁇ m / m in the temperature range of 70 to 80 ° C. This problem may be further exacerbated when it exceeds C, which may not be used in the backlight unit as a composite reflective polarizing film, and is excellent in terms of reliability when the coefficient of thermal expansion is less than 4 ⁇ m / m ⁇ ° C. Material having excellent optical properties and at the same time is difficult to develop, and even if developed, there is a problem that it is difficult to select a production cost at a very expensive price.
  • the material of the reliability support layer is not limited as long as it satisfies the condition (1) according to the present invention described above, but preferably may be a polyester resin in consideration of optical properties, heat resistance, chemical resistance, mechanical properties and economical efficiency. .
  • the polyester resin is polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytetramethylene terephthalate (PTT), polyhexylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene-1, 2-bis (phenoxy) ethane-4,4'-dicarboxylate, polyethyleneisophthalate / terephthalate copolymer, polybutylene terephthalate / isophthalate copolymer and polybutylene terephthalate / decane-dicarboxyl It may include at least one component selected from the group consisting of a rate copolymer, and may preferably be polyethylene terephthalate (PET) or modified polyethylene terephthalate, more preferably polyethylene terephthalate (PET).
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • PTT polytetramethylene terephthal
  • the modified polyethylene terephthalate may further include a sulfonated metal salt in addition to terephthalic acid as a diol component of ethylene glycol and an acid component as a monomer, for example, dimethyl sulfoisophthalate sodium salt and the like There may be.
  • an aromatic polyhydric carboxylic acid other than terephthalic acid may be further included as a monomer, and as an example thereof, may be any one or more of dimethyl terephthalate, isophthalate and dimethyl isophthalate.
  • a diol component other than ethylene glycol may be further included as a monomer as a diol component, and as an example of such a diol component, neopentyl glycol, diethylene glycol, neopentyl glycol, 1,3-propanediol, 1,4-butanediol , 1,6-hexanediol and the like.
  • the specific composition and composition ratio of the modified polyethylene terephthalate are not particularly limited in the present invention.
  • the reliability support layer may be a film stretched in at least one direction to further express physical properties such as improved strength, dimensional stability, heat resistance, more preferably a biaxially stretched film, even more preferably It may be a film heat-fixed at 175 ⁇ 225 °C after biaxial stretching, more preferably may be a polyethylene terephthalate film heat-fixed after biaxial stretching.
  • the thickness of the reliability support layer may be 10 ⁇ 600 ⁇ m, more preferably, the thickness is 60 ⁇ 300 ⁇ m, even more preferably to minimize the reduction of the brightness according to the increase of the thickness of the support layer and to achieve the desired reliability
  • the thickness may be 100 ⁇ 200 ⁇ m.
  • the protective function of the film may not be performed properly. If the thickness of the reliability support layer exceeds 600 ⁇ m, high reliability may be realized, but there may be a problem in that the luminance is significantly reduced due to the thickness of the reliability support layer that is thickened. However, it is not limited to the preferred thickness range of the above-described reliability support layer, and may be adjusted differently according to the thickness of the reflective polarizing film used.
  • the reflective polarizing film 200 and the reliability support layer 300 may further include a first primer layer for enhancing the adhesion.
  • the first primer layer may be formed by curing including at least one polymer resin of photocurable polymer resin or thermosetting polymer resin.
  • the polymer resin any polymer resin capable of minimizing the brightness reduction due to the primer layer may be used without limitation, and the material thereof may be a silicone-based, urethane-based, silicone-urethane hybrid structure SU polymer, acrylic, isocyanate, It may be a polymer resin containing a polymer material classified into polyvinyl alcohol, gelatin, vinyl, latex, polyester, aqueous polyester, and the like.
  • it may be a UV curable adhesive composition containing the oligomer and monomer in a weight ratio of about 20 to 80%: 80 to 20%.
  • oligomers selected from urethane, epoxy acrylate, and polyester series may be applied.
  • the monomers include 6,5,4,3,2,1 functional groups, Dipentaerythritol Hexaacrylate (DPHA), Dipentaerythritol Pentaacrylate (DPPA), trimethylolpropane triacrylate (TMPTA), Trimethylol propane triacrylate (TMPTMA), Hexanedioldiacrylate (HDPA), and DPGDA (DPGDA).
  • DPHA Dipentaerythritol Hexaacrylate
  • DPPA Dipentaerythritol Pentaacrylate
  • TMPTA trimethylolpropane triacrylate
  • TMPTMA Trimethylol propane triacrylate
  • HDPA Hexanedioldiacrylate
  • DPGDA DPGDA
  • Dipropylene Glycol Diacrylate Tripropylene Glycol Diacrylate (TPGDA), Phenoxyethylacrylate (PEA), Isobonylmethacrylate (IBOA), 2-Hydroxyethyl Methacrylate (2-HEMA), and 2-hydroxyethyl acrylate (2-HEA)
  • One or more monomers selected from may be applied. More specifically, as a non-limiting example, as the monomer, DPAH (5-30%), DPPA (5-30%), TMTPA (3-20), PEA (10-50%), IBOA (10-40) %), 2-HEMA (1-10), 2-HEA (1-10%), and other monomers (1-30%).
  • the first primer layer may be formed thinner than other layers, and the thickness of the first primer layer may be adjusted to improve light transmittance and lower reflectance.
  • the first primer layer may have a thickness of about 1 ⁇ m to about 10 ⁇ m. If the thickness of the first primer layer is less than 1 ⁇ m, the adhesion between the reflective polarizing film and the reliability support layer may be insignificant. If the thickness of the first primer layer exceeds 10 ⁇ m, staining or agglomeration of molecules may occur during the treatment of the first primer layer. May occur.
  • the composite reflective polarizing film according to the first embodiment of the present invention has a haze value of 65% or more, preferably 73% or more, as the condition (2) according to the present invention. Preferably at least 85%, even more preferably at least 90%.
  • the haze value By satisfying the haze value, it is possible to prevent various foreign substances, bubbles, etc., which may be included in the film in the manufacturing process, from appearing on the appearance, thereby improving the appearance quality. If the above range is not satisfied, there is a problem in that the appearance quality is deteriorated and additional devices or other components are added to prevent foreign matters from appearing. Since it is not preferable, there is a problem that causes an increase in manufacturing time, manufacturing cost due to the added configuration.
  • the present invention includes embodiments in which the stacking order of the light diffusing layer 100, the reflective polarizing film 200 and the reliability support layer 300 in the first embodiment according to the present invention is different, for example, composite reflection
  • the polarizing film may be implemented by stacking the reflective polarizing film 200 ′, the reliability support layer 300 ′, and the light diffusion layer 100 ′ as shown in FIG. 18.
  • the composite reflective polarizer film as shown in FIG. 18 may reduce the luminance slightly due to the reliability support layer in comparison with the composite reflective polarizer film as shown in FIG. 5, but may prevent the appearance of excellent reliability and surface appearance at a similar level.
  • a complex reflective polarizing film may be implemented by stacking the reflective polarizing film, the light diffusing layer, and the reliability support layer differently from FIGS. 5 and 18.
  • the brightness may be reduced due to the reliability support layer, but there is an advantage of preventing the appearance of excellent reliability and surface appearance at a similar level.
  • the light diffusing layer may include a fine pattern, more preferably a prism pattern, in order to improve decreasing optical characteristics.
  • the first embodiment described above may be manufactured through the following manufacturing method, but is not limited thereto. Specifically, (1) forming a light diffusion layer on the upper surface of the reflective polarizing film; And (2) forming a reliability support layer on the lower surface of the reflective polarizing film, wherein steps (1) and (2) may be performed regardless of the order.
  • steps (1) and (2) may be performed regardless of the order.
  • step (1) the step of forming a light diffusion layer on the upper surface of the reflective polarizing film.
  • the reflective polarizing film includes (a) a substrate and a plurality of dispersions included in the substrate to transmit the first polarized light irradiated from the outside and to reflect the second polarized light, wherein the plurality of dispersions are formed with the substrate.
  • the refractive index is different in at least one axial direction, and at least 80% of the plurality of dispersions contained in the substrate have an aspect ratio of the short axis length to the major axis length of 1/2 or less based on the vertical section in the longitudinal direction.
  • Dispersions having an aspect ratio of 1/2 or less are included in at least three groups according to the cross-sectional area, the dispersion cross-sectional area of the first group of the group is 0.2-2.0 ⁇ m 2 , and the dispersion cross-sectional area of the second group is greater than 2.0 ⁇ m 2. further comprising: from 5.0 ⁇ m 2 or less, dispersion of the cross-sectional area of the third group is 2 or less from 10.0 ⁇ m 5.0 ⁇ m than 2, the dispersion of the first group to third group is to be arranged at random; It may be prepared to include.
  • the reflective polarizing film prepared through the step (a) as a core layer (b), forming a skin layer integrated on at least one surface of the core layer It may further comprise a; reflective polarizing film may be prepared.
  • the base component, the dispersion component, and the skin layer component are supplied to the extruder.
  • the substrate component and the dispersion component may be separately supplied to independent extrusion parts, in which case the extrusion parts may be composed of two or more parts.
  • a feed to one extruder comprising a separate feed passage and distributor so that the polymers do not mix.
  • the extruder may be an extruder, which may further include heating means or the like to convert the supplied polymers in the solid phase into the liquid phase.
  • the viscosity is so designed that there is a difference in polymer flow so that the dispersion component can be arranged inside the base component, and the base component is preferably made to have better flowability than the dispersion component.
  • the dispersion component is randomly arranged in the substrate through the difference in viscosity while the substrate component and the dispersion component pass through the mixing zone and the mesh filter zone.
  • the skin layer component may be laminated on both surfaces of the core layer.
  • the material and the thickness of the skin layer may be the same or different from each other.
  • the size and arrangement of the cross-sectional area of the dispersion component may be randomly adjusted by appropriately adjusting the spreading degree of the substrate through a coat-hanger die, which is a kind of flow control unit as shown in FIGS. 19 and 20.
  • a coat-hanger die which is a kind of flow control unit as shown in FIGS. 19 and 20.
  • the dispersion component contained therein also spreads from side to side.
  • the cooling used in the manufacture of a conventional reflective polarizing film may be solidified, and then the smoothing step may be performed through a casting roll process or the like.
  • the stretching may be performed through a conventional stretching process of the reflective polarizing film, thereby causing a difference in refractive index between the base component and the dispersion component, causing a light modulation phenomenon at the interface, and spreading the first component ( Dispersion component) further reduces the aspect ratio through stretching.
  • the stretching step may be performed uniaxially or biaxially, and more preferably, uniaxially.
  • the stretching direction may be performed in the longitudinal direction of the first component.
  • the draw ratio may be 3 to 12 times.
  • methods for changing an isotropic material to birefringence are commonly known and, for example, when drawn under appropriate temperature conditions, the dispersion molecules can be oriented so that the material becomes birefringent.
  • the final reflective polarizing film may be manufactured by heat-setting the stretched reflective polarizing film.
  • the heat setting may be heat setting through a conventional method, preferably from 180 to 200 may be performed through an IR heater for 0.1 to 3 minutes.
  • the step of forming the light diffusion layer on the upper surface of the reflective polarizing film that can be produced by the above-described method is performed.
  • an adhesive layer may be further formed on the upper surface of the reflective polarizing film in order to more easily form the light diffusion layer and to improve the adhesion, appearance, and total light characteristics of the light diffusion layer.
  • a specific method is not particularly limited in the present invention, but preferably a master roll or a reverse pattern of the fine pattern is formed by the reverse pattern of the fine pattern is molded It may be formed on the reflective polarizing film through the patterned mold film.
  • the inverse of the one or more micropatterns selected from the group consisting of prism, lenticular, microlens, triangular pyramid, bead and pyramid pattern Transferring the reflective polarizing film to the master roll having the pattern formed on the outer surface, and applying the molten polymer resin to the pattern surface or the reflective polarizing film of the master roll; And 1-ii) applying the at least one of light and heat to the polymer resin while pressing the patterned surface of the master roll to cure the polymer resin and to separate the polymer resin.
  • step 1-ii) by irradiating again UV or heat to the second step of curing the polymer resin may further comprise a.
  • FIG. 21 is a schematic diagram of a micropattern forming process according to an exemplary embodiment of the present invention
  • FIG. 22 is a cross-sectional view illustrating a detailed structure of the molding part of FIG. 21.
  • the reflective polarizing film 770 passes through the infrared lamp 751 through the guide roll 754 while being released from the start trol 755.
  • the reflective polarizing film 770 is surface-modified by the infrared rays of the infrared lamp, so that the adhesion with the light diffusion layer 771 is improved.
  • the reflective polarization film 770 leaving the start trol 755 is introduced into the master roll 705 via the pattern guide roll 764, the light diffusion layer is formed on the pattern surface of the master roll 705 from the injection portion 742.
  • a polymer used as a material is coated to be combined with the reflective polarizing film 770.
  • the resin is a resin melted at room temperature, and may be primarily cured due to the primary UV light irradiated from the primary UV curing device 752 disposed under the master roll 705.
  • the temperature around the curing device (752) is 20 ⁇ 30 °C
  • the temperature of heat generated while the resin is curing is 40 ⁇ 80 °C
  • the glass transition temperature Tg: complete from solid to liquid in the polymer resin
  • the temperature exhibiting changed properties like soft rubber the glass transition temperature (Tg: complete from solid to liquid in the polymer resin)
  • the light diffusion layer 771 which completely transfers the pattern shape of the master roll surface exits through the pattern guide roll 764 again, and is a reflection polarization film in which the reflection polarization film 770 and the light diffusion layer 771 are incorporated. It is molded into 772 and wound around the guide roll 754 to the finish roll 756.
  • the cross-section of the reflective polarization film 772 having the turn formed by irradiating UV over two times is a surface opposite to the cross-section of the master roll 705. If it is an engraved surface, the turn-shaped reflective polarization film 772 becomes an embossed surface of the relief.
  • the material of the pattern forming mold film may be a transparent, flexible, film having a predetermined tensile strength and durability, and PET. Preference is given to using films.
  • the step (1) is at least one micropattern selected from the group consisting of 1-1) reflective polarizing film and prism, lenticular, micro lens, triangular pyramid, bead and pyramid pattern Transferring the mold film for forming a pattern on one surface of which the reverse phase pattern with respect to; 1-2) closely contacting an upper surface of the reflective polarizing film with one surface on which a pattern is formed in the mold film for pattern formation; 1-3) filling an empty space between the two films formed by the pattern by injecting a fluid material between the closely-adhesive reflective polarizing film and the pattern forming mold film; 1-4) hardening the filled material and separating the mold film for pattern formation.
  • 1-1) reflective polarizing film and prism, lenticular, micro lens, triangular pyramid, bead and pyramid pattern Transferring the mold film for forming a pattern on one surface of which the reverse phase pattern with respect to; 1-2) closely contacting an upper surface of the reflective polarizing film with one surface on which a pattern is formed in the mold
  • the step of applying pressure to the closely-adhesive reflective polarizing film and the pattern forming mold film to evenly fill the empty space between the two films formed by the pattern may include.
  • the step 1-4) may include applying any one or more of heat and light to the material filled in the empty space between the two films formed by the pattern.
  • FIG. 23 is a schematic diagram of a micropattern forming process according to another preferred embodiment of the present invention.
  • the reflective polarizing film 810 wound on the first roll 820 is transferred by the guide rolls 830a to 830c.
  • the molding mold 842 of the pattern molding part 840 is also in a state of being transported / rotated while being wound around the master roll 844 and the pattern guide rolls 846a and 846b.
  • the reflective polarizing film 810 is drawn by the guide roll 830c to be engaged with the molding mold 842.
  • the guide roll 830c performs a gap control function of controlling the thickness of the coating liquid applied to the reflective polarizing film 810, that is, the pattern of the light diffusion layer in which the light diffusing layer is resin.
  • the pattern of the light diffusion layer may be thinner.
  • the pattern of the light diffusion layer may be formed. It can form thicker.
  • the pattern thickness of the light diffusion layer can be adjusted by the viscosity of the coating liquid, the patterning speed, the tension of the reflective polarizing film, and the like, in addition to the gap between the guide roll 830c and the master roll 844.
  • the reflective polarizing film 810 is filled with the coating liquid is injected by the coating liquid injection means 860 to the point where the guide roll 830c and the master roll 844 is engaged, and is pushed and filled between the pattern of the molding mold 842,
  • the pressure is uniformly distributed by the pressure between the guide roll 830c and the master roll 844 to form a pattern.
  • the coating liquid distributed between the patterns is cured by heat and / or UV emitted from the curing means 870.
  • the reflective polarizing film on which the patterned coating solution is cured and applied is separated from the molding mold 842 while being drawn by the guide roll 830d, and the reflective polarizing film 812 having the pattern formed is transferred by the guide roll 830e. It is wound on two rolls 850.
  • the guide roll 830d performs a peeling function of separating the reflective polarizing film 812 to which the coating liquid is applied, that is, the light diffusion layer is formed, from the molding mold 842.
  • the reflective polarizing film 810 and the reflective polarizing film 812 formed on one surface of the reflective polarizing film 810 are classified with respect to the convenience of description in a state of being connected to each other. That is, the reflective polarizing film 810 means a state before the light diffusing layer is formed, and the reflective polarizing film 812 on which the light diffusing layer is formed passes through the pattern molding part 840, and the coating liquid patterned on the reflective polarizing film It means the state applied and completed.
  • FIG. 23 shows only a part of the pattern layer formed on the reflective polarizing film 812 on which the light diffusing layer is formed. In fact, the light diffusing layer is also formed on the reflective polarizing film wound on the second roll 850.
  • Figure 24 is a schematic diagram of a micropattern forming process according to another preferred embodiment of the present invention.
  • the molding mold 942 is formed in the shape of a roll as long as the length of the reflective polarizing film 910 so that the reflective polarizing film 912 in which the light diffusing layer is formed is seamless.
  • the first roll 920, on which the reflective polarizing film 910 is wound, and the second roll 950, on which the reflective polarizing film 912 is formed are formed.
  • Guide rolls 930a to 930f provided on both sides and transferring the reflective polarization film and the reflective polarization film having the light diffusion layer are provided between the first roll 920 and the second roll 950.
  • the master roll 946 of the pattern molding part 940 is in close contact between the guide roll 930c and the guide roll 930d to apply the patterned coating solution to the reflective polarizing film 910.
  • the number and position of the guide rolls 930a to 930f may be changed depending on the embodiment.
  • the pattern molding part 940 compresses the coating liquid according to the pattern of the molding mold by compressing a molding mold 942 having a film shape with a pattern shape, a third roll 944 on which the molding mold is wound, and a coating liquid injected into the molding mold. It consists of a master roll 946 for molding and applying it to the reflective polarizing film 910, pattern guide rolls 947a to 947d for transferring the molding mold, and a fourth roll 948 to which the transferred molding mold is wound. The number and position of the pattern guide rolls 947a to 947d can be changed depending on the embodiment.
  • the molding mold 942 is wound on the third roll 944 and transferred to the reflective polarization film 910 while being transferred by the master roll 946 and the guide rolls 947a to 947d.
  • the molding mold 942 is preferably formed to have the same length as the reflective polarizing film 910, through which a pattern defect or a pattern is broken due to a seam in the reflective polarizing film 912 in which a light diffusing layer including a pattern is formed. Without this, the pattern is formed evenly over the entire area.
  • FIG. 24 only a part of the pattern in which the pattern is implemented is illustrated in the molding mold, but in practice, the pattern is implemented throughout the molding mold.
  • a coating solution injection means 960 for injecting a coating solution is provided.
  • curing means 970 is provided to cure the coating liquid by irradiating heat or UV.
  • the bead coating layer is not particularly limited to the method of forming the bead coating layer on the reflective polarizing film, but the bead coating layer-forming composition may be coated on the reflective flat polarizing film by a conventional method.
  • the coating method may be formed by any one of comma coating, reverse coating, gravure coating, braid coating, silk screen coating, and slot die head coating.
  • the bead coating layer may be formed such that the bead is included in the resin layer by adjusting the thickness according to the bead diameter included in the composition and the amount of the applied composition, or only a portion of the bead may be formed as a buried bead coating layer.
  • the coated composition may be cured through light and / or heat depending on the type of resin included according to conventional conditions, and the light may preferably be UV.
  • step (2) the step of forming a reliability support layer on the lower surface of the reflective polarizing film.
  • Step (2) comprises the steps of 2-1) forming a first primer layer on the upper surface of the reliability support layer to enhance adhesion between the reflective polarizing film and the reliability support layer; And 2-2) laminating the first primer layer and the lower surface of the reflective polarizing film to be in contact with each other.
  • the method of forming the first primer layer on top of the reliability support layer may be a known method, and the present invention is not particularly limited thereto.
  • the method may be a comma coating, a reverse coating, a gravure coating, a braid coating, or a silk screen coating. And slot die head coating or the like.
  • the first primer layer may be cured by laminating to the reflective polarizing film in a semi-cured state or laminating to the reflective polarizing film as it is coated or cured.
  • the curing may be a specific method according to the type of polymer resin used as the first primer layer, preferably can be cured through heat and / or light, the specific method for performing this employ a known method This is not particularly limited in the present invention.
  • FIG. 25 is a cross-sectional view of the laminated reflective polarizing film and the reliability support layer according to the preferred embodiment of the present invention, and the first primer layer 400 is formed on the lower surface of the reflective polarizing film 200.
  • the laminated reflective polarizing film / first primer layer / reliable support layer is formed in the star of FIG. 22.
  • the light diffusion layer may be formed on the upper surface of the reflective polarizing film by being injected into the troll 755 or the first roll 820 of FIG. 23.
  • the complex reflective polarization film 1000 may include a light diffusion layer 100 formed on an upper surface of the reflective polarization film 200, a reliability support layer 300 formed on a lower surface of the reflective polarization film 200, and the And a light collecting layer 600 formed on the lower surface of the reliability support layer, wherein the first primer layer 400 and the reliability support layer 300 are provided to enhance adhesion between the reflective polarizing film 200 and the reliability support layer 300.
  • the light collecting layer 600 may further include a second primer layer 500 for enhancing adhesion.
  • the reliability support layer 300 may have a thickness of 10 ⁇ m to 300 ⁇ m due to the light collecting layer 600 to be described later. More preferably, the reliability support layer 300 may have a thickness of 30 to minimize the reduction in luminance and to more easily implement the desired reliability. ⁇ 200 ⁇ m, even more preferably a thickness of 80 to 150 ⁇ m. If the thickness of the reliability support layer is less than 10 ⁇ m, the desired reliability may not be realized, and even if the reliability is compensated for through the light collecting layer to be described later, a thick light collecting layer should be used to realize the desired reliability. It may be significantly reduced, and may not cover the appearance of foreign matter on the appearance of the reflective polarizing film.
  • the composite reflective polarizing film when considering a product such as a backlight unit including the composite reflective polarizing film Is bound to have a limited thickness, but the thickness of the light collecting layer to be described later is reduced due to the increase in the thickness of the reliability support layer, there is a problem that may not realize the effect according to the target light collecting layer.
  • the present invention is not limited to the above-described preferred thickness range of the reliability support layer, and may be differently adjusted according to the thickness of the reflective polarizing film used and the support thickness range in the light collecting layer described later.
  • the light collecting layer 600 formed on the lower surface of the reliability support layer 300 in the composite reflective polarizing film will be described.
  • FIG. 27 is a perspective view of a light collecting layer included in a preferred embodiment of the present invention, wherein the light collecting layer 600 includes a support part 620 and a prism pattern part 610 formed on one surface of the support part 620.
  • the prism pattern part 610 may be coupled to face the bottom surface of the reliability support layer (not shown) or the bottom surface of the second primer layer (not shown).
  • the support part 620 serves to support the prism pattern part 610 included in the light collecting layer 600, and also functions to further improve the reliability of the composite reflective polarizing film. That is, as the light collecting layer for the light collecting function is integrated into the composite reflective polarizing film, the light collecting layer may simultaneously perform the function of supporting the complex reflective polarizing film as well as the light collecting function, and the thin film due to the supporting function performed by the light collecting layer Even if the reliability support layer is implemented, the composite reflective polarizing film may not have a problem in maintaining reliability as a whole, and thus all properties may be satisfied at the same time, and may be very advantageous in thinning the optical film included in the backlight unit.
  • the support 620 may be used without limitation in the case of a material capable of supporting various structured patterns included in the art for improving optical properties and a material that does not inhibit the transmission of light.
  • a material capable of supporting various structured patterns included in the art for improving optical properties for improving optical properties
  • a material that does not inhibit the transmission of light for example, polycarbonate series, polysulfone series, polyacrylate series, polystyrene series, polyvinyl chloride series, polyvinyl alcohol ), Poly norbornene (poly norbornene), polyester (poly ester) may include a material, but is not limited thereto.
  • the support part 620 preferably includes a polyester-based material in consideration of remarkably excellent support ability, product cost, heat resistance, and light transmittance, and more preferably, the polyester-based material is polyethylene terephthalate (PET). Can be.
  • the polyethylene terephthalate film may be a film stretched in at least one axial direction.
  • the thickness of the support part 620 may be designed differently depending on the height of the prism pattern part formed on the support part, the total thickness of the complex reflective polarizing film, the thickness of the reliability support layer, and the desired physical properties such as minimizing the luminance reduction. It is preferable to have a thickness of 10 to 300 ⁇ m, more preferably 60 to 200 ⁇ m, in order to remarkably improve the reliability of the composite reflective polarizing film according to the minimum support function for the light collecting layer and the synergistic effect with the support layer. More preferably, it has a thickness of 80-200 micrometers. If the thickness of the support portion is less than 10 ⁇ m, the support function of the prism pattern portion may not be smoothly performed, and the reliability improvement of the composite reflective polarizing film may be insignificant. In addition, if the thickness exceeds 300 ⁇ m may be advantageous for the expression of the reliability of the desired composite reflective polarizing film, there may be a problem that the optical properties such as luminance is significantly reduced.
  • the support portion may satisfy the thermal expansion coefficient of 4 ⁇ 35 ⁇ m / m ⁇ °C in 70 ⁇ 80 °C temperature range, more preferably 70 ⁇ 80 °C temperature range
  • the thermal expansion coefficient at may satisfy 10 to 25 ⁇ m / m ⁇ ° C.
  • the coefficient of thermal expansion exceeds 35 ⁇ m / m ⁇ °C in the temperature range of 70 ⁇ 80 °C
  • the coefficient of thermal expansion If it is less than 4 ⁇ m / m ⁇ °C excellent in terms of reliability, but the reliability support layer having such a thermal property can not be produced in the form of a film or the optical properties can be very degraded, and generally the material used for the optical film thermal expansion
  • the draw ratio In order to produce a coefficient of less than 4 ⁇ m / m ⁇ ° C., the draw ratio must be made very high or the thickness of the film itself is made very thick. Therefore, there is a problem in that optical characteristics such as luminance are degraded.
  • the prism pattern part 310 may be formed of a plurality of prisms 611 and 612 formed on the support part 620 as shown in FIG. 27 to enhance the light condensing function at the bottom of the composite reflective polarization film.
  • each prism 611 includes a prism surface inclined to both sides with respect to the peak portion 611a at the upper end.
  • the vertex angles of the prisms 611, 612 may be in the range of 45 ° to 135 °, in the range of 60 ° to 130 °, or 85 ° to 105 °.
  • the pitch of the prism 611 may be about 20 to 100 ⁇ m
  • the height may be about 10 to 60 ⁇ m.
  • the prism 611 may be continuously formed from one side to the other side of the support part 620. Adjacent prisms 611, 612 may be adjacent to each other, but may also be partially spaced apart. Here, when the prisms 611 and 612 are adjacent to each other, the bottom surfaces of the prisms are adjacent to each other.
  • the prisms 611 and 612 may be formed on the entire surface of the support part 620.
  • the first direction X1 which is an extension direction of the prisms 611 and 612, may be parallel to the long side or the short side of the support part 620.
  • each of the first directions X1 may have an acute angle of intersection with the long side and / or short side of the support 620.
  • the crossing angle may be in the range of ⁇ 5 to ⁇ 30 °.
  • the prism pattern part 610 may be a silicone polymer, a urethane polymer, a silicone-urethane hybrid structure, a SU polymer, an acrylic, an isocyanate, a polyvinyl alcohol, a gelatin, a vinyl, a latex, a polyester, an aqueous polyester, or the like. It may be formed of a polymer resin comprising, preferably may be formed by curing through heat and / or light.
  • a second primer layer 500 may be further included between the reliability support layer and the light condensing layer to enhance adhesion.
  • the second primer layer 500 may be formed by curing including at least one polymer resin of a photocurable polymer resin or a thermosetting polymer resin, the specific type is the material of the first primer layer in the first embodiment described above It can be adopted.
  • the second primer layer may be formed thinner than other layers, and the thickness of the second primer layer may be adjusted to improve the light transmittance and lower the reflectance.
  • the thickness of the second primer layer may be 3 ⁇ m to 10 ⁇ m. If the thickness of the second primer layer is less than 3 ⁇ m, the adhesion between the reliability support layer and the light collecting layer may be insignificant. If the thickness of the second primer layer exceeds 10 ⁇ m, staining or aggregation of molecules may occur when the second primer layer is treated. Can be.
  • the composite reflective polarizing film according to the second embodiment of the present invention may be implemented so that the value of the following equation 1 satisfies 0.3 ⁇ 2.0.
  • the composite reflective polarization film includes a reflective polarization film 200 and a reliability support layer 300 for maintaining the reliability of the reflective polarization film, thereby increasing condensing.
  • the light collecting layer 600 is provided, and the multifunction is integrally combined.
  • the light collecting layer 600 includes a support part 620 that performs a function of supporting the light collecting layer.
  • the support 620 of the light collecting layer 600 provided to increase the light collecting power is divided and shared by the support function of the reliable support layer provided to maintain the reliability of the composite reflective polarizing film, thereby making the composite support reflective layer 300 without thickening.
  • the polarizing film may minimize the deterioration of optical properties such as luminance, which may be generated by providing the desired reliability and at the same time having the support layer.
  • the value of Equation 1 according to the present invention should satisfy 0.3 to 2.0, and preferably, the value of Equation 1 may be 0.6 to 1.6.
  • the value of Equation 1 according to the present invention is less than 0.3, the wrinkles or bends of the reflective polarizing film at high temperature and / or the composite reflective polarizing film are warped by heat in accordance with the thermal expansion coefficient difference between the reflective polarizing film and the reliable support layer. It may be difficult to prevent such a change in appearance, the reliability is very low, the wrinkles or bends may cause panel staining phenomenon.
  • the thickness of the support may be thin, so that the support function for the light collecting layer may be difficult to express the physical properties of the light collecting layer as the support function of the light collecting layer is deteriorated.
  • the value of Equation 1 exceeds 2.0, the deterioration of optical properties such as luminance may be remarkable, and thus the desired physical properties may not be obtained, which is not very desirable for thinning the complex reflective polarizing film.
  • the composite reflective polarizing film according to the preferred embodiment of the present invention may not prevent the appearance change of the wrinkles or bends of the film or the brightness is lowered to satisfy the value of 0.25 to 4.0 according to Equation 2 below. More preferably 0.6 to 2.5 and even more preferably 0.9 to 2.0.
  • Equation 2 If the value of Equation 2 is less than 0.25, the relatively reliable support layer becomes very thin, and thus it may be difficult to prevent appearance changes such as wrinkles and bends that may occur in the reflective polarizing film, and damage such as tearing of the reflective polarizing film easily. Can be difficult to prevent. In addition, if the value of Equation 2 exceeds 4, there is a problem in that the thickness of the reliability support layer becomes too thick and the deterioration of optical properties such as luminance increases.
  • the composite reflective polarizing film according to the second embodiment of the present invention described above comprises the steps of: (a) forming a light diffusion layer on an upper surface of the reflective polarizing film; (b) laminating the upper surface of the reliability support layer to abut the lower surface of the reflective polarizing film; And (c) forming a light collecting layer on a lower surface of the reliability support layer; It may be prepared to include.
  • Steps (a) and (b) correspond to steps (1) and (2) according to the first embodiment of the present invention as described above, and thus a detailed description thereof will be omitted.
  • step (c) is a step of forming a light collecting layer on a lower surface of the reliability support layer.
  • the light collecting part of the light collecting layer is a prism pattern will be described as an example (step c).
  • a specific method of forming the prism pattern on the upper surface of the support is not particularly limited in the present invention, but preferably, a master roll having a reverse pattern of the prism pattern is imprinted or a pattern forming mold film having the reverse pattern of the prism pattern formed thereon. Through the upper portion of the support can be formed.
  • the support part is closely adhered to the master roll formed on the outer surface of the pattern inverse to the prism pattern, Applying a molten polymer resin to the pattern surface or the support of the master roll; And hardening and separating the polymer resin by applying any one or more of light and heat while the polymer resin is press-molded on the pattern surface of the master roll.
  • FIG. 28 is a schematic view of a process for forming a fine pattern of a light collecting layer according to an exemplary embodiment of the present invention.
  • the support part 1070 is released from the star trol 1055 and passes through the guide roll 1054 to the infrared lamp. (1051).
  • the support part 1070 is surface-modified by the infrared rays of the infrared lamp, so that the adhesion to the prism pattern part 1071 is improved.
  • the prism pattern part from the injection part 1042 is formed on the pattern surface of the master roll 705).
  • the resin is a resin melted at room temperature, and may be primarily cured due to the primary UV light irradiated from the primary UV curing device 1052 disposed below the master roll 1005.
  • the temperature around the curing apparatus 1052 is 20 to 30, and the temperature of heat generated while the resin is cured is 40 to 80, and the glass transition temperature (Tg: polymer phase of the resin is completely changed from solid to liquid). Before going through, it can be near the temperature exhibiting the changed properties, like soft rubber.
  • the prism pattern portion 1071 which completely transfers the pattern shape of the master roll surface in the glass transition state, exits through the pattern guide roll 1064 again, and the condensing layer in which the support portion 1070 and the prism pattern portion 1071 are combined ( 1072 is formed and wound on the finish roll 1056 past the guide roll 1054.
  • the cross-section of the light collecting layer 1072 having the turn formed by irradiating UV over two times is a surface opposite to the cross-section of the master roll 1005.
  • the master roll is intaglio engraving. If it is an (engraved) surface, the turn-shaped reflective polarization film 772 becomes an embossed surface of the relief.
  • the material of the pattern forming mold film may be a transparent, flexible, film having a predetermined tensile strength and durability, and PET. Preference is given to using films.
  • the method may further include applying a pressure to the tightly supported support part and the mold-forming mold film to evenly fill the empty space between the two films formed by the pattern.
  • the curing may be performed by applying any one or more of heat and light to the material filled in the empty space between the two films formed by the pattern.
  • FIG. 29 is a schematic diagram of a process for forming a fine pattern of a light collecting layer according to another exemplary embodiment of the present invention.
  • the support part 1110 wound on the first roll 1120 is transferred by guide rolls 1130a to 1130c. do.
  • the molding mold 1142 of the pattern molding part 1140 is also in a state of being transported / rotated while being wound on the master roll 1144 and the pattern guide rolls 1146a and 1146b.
  • the support part 1110 is led by the guide roll 1130c to be engaged with the molding mold 1142.
  • the guide roll 1130c performs a gap adjusting function for adjusting the thickness of the coating liquid applied to the support part 1110, that is, the pattern of the prism pattern part in which the prism pattern part is a resin. More specifically, when the guide roll 1130c is in close contact with the master roll 1144, the pattern of the prism pattern portion may be formed thinner. On the contrary, when the guide roll 1130c is further away from the master roll, the pattern of the prism pattern portion may be more plentiful. Can form thick. The pattern thickness of such a prism pattern part can be adjusted by the viscosity of a coating liquid, the patterning speed, the tension of a reflective polarizing film, etc. other than the space
  • the support portion 1110 is filled with the coating liquid is injected by the coating liquid injection means 1160 to the point where the guide roll 1130c and the master roll 1144 is engaged, and is pushed and filled between the patterns of the molding mold 1142, the guide roll Uniformly distributed by the pressure between the 1130c and the master roll 1144 is pattern molded.
  • the coating liquid distributed between the patterns is cured by heat and / or UV emitted from the curing means 1170.
  • the reflective polarizing film on which the patterned coating solution was cured and applied is separated from the molding mold 1142 while being drawn by the guide roll 1130d, and the light collecting layer 1112 having the prism pattern portion formed on the support 1110 is a guide roll 1130e.
  • the guide roll 1130d performs a peeling function of separating the support part 1110 to which the coating liquid is applied, that is, the prism pattern part is formed from the molding mold 1042.
  • the support 1110 and the support 1110 formed on one surface of the prism pattern part are classified for convenience of description in a state of being connected to each other. That is, the support part 1110 means a state before the prism pattern part is formed, and the half support part 1110 on which the prism pattern part is formed passes through the pattern molding part 1040 and a pattern-forming coating liquid is applied to the support part 1110. It means the completed state. 28 shows only a part of the pattern formed in the support part 1110 on which the prism pattern part is formed, and in reality, the prism pattern part is also formed on the support part wound on the second roll 1150.
  • Step (c) is a step of laminating the light collecting layer manufactured through the manufacturing process as shown in FIG. 28 or 29 to the lower surface of the reliability support layer, specifically c-1) to enhance the adhesion between the reliability support layer and the light collecting layer.
  • the method of forming the second primer layer under the reliability support layer may be a well-known method, and the present invention is not particularly limited thereto.
  • comma coating, reverse coating, and gravure coating may be used. It may be formed by any one method, such as braid coating, silk screen coating and slot die head coating.
  • the step of laminating one surface of the light collecting layer, more preferably the prism pattern portions of the light collecting layer, may be in contact with each other.
  • the second primer layer may be cured after being laminated to the reflective polarizing film as it is laminated or cured or coated with the light condensing layer in a semi-cured state.
  • the curing may be a specific method according to the type of the polymer resin used as the second primer layer, preferably can be cured through heat and / or light, the specific method for performing this employs a known method This is not particularly limited in the present invention.
  • the second primer layer is laminated to be in contact with each other, and the prism pattern portion of the light collecting layer.
  • the second primer layer has a reversed phase on all or a part of the prism pattern. Intaglio may be imprinted. At this time, the degree of engraving may be engraved so as to correspond to the inverse of the part or the whole of the prism peak based on one cross section of the prism.
  • a portion of the second primer layer in which the inverted intaglio is not engraved may form a constant inclined surface based on the support of the light collecting layer, and the inclination angle may form an inclination angle of about 1 to 4.5 ° based on the support surface.
  • the inclination angle may form an inclination angle of about 1 to 4.5 ° based on the support surface.
  • the prism pattern of the second primer layer and the light collecting layer may have a space between the support upper surface of the light collecting layer and the valley of the prism pattern formed on the upper surface, or may be formed on the upper surface of the support and the upper surface of the light collecting layer. It can be combined leaving a certain space between the valleys of the prism pattern, which can be filled with a vacuum or air layer.
  • the method of manufacturing a composite reflective polarizing film according to the second embodiment of the present invention described above may be prepared by performing steps (a) to (c) regardless of the order.
  • the first primer layer 400 is formed on the lower surface of the reflective polarization film 200
  • the reliability support layer 300 is formed on the bottom surface of the reflective polarization film 200.
  • the laminated reflective polarizing film / first primer layer / reliable support layer is carried out to perform step (a) of FIG. 21.
  • the light diffusion layer may be formed on the upper surface of the reflective polarizing film by being injected into the first roll 820, and then step (c) may be performed.
  • the reflective polarizing film 200 and the reliability support layer 400 are (B) to produce the laminated reflective polarizing film / reliable support layer / condensing layer by performing the step of laminating (b). Then, the laminated reflective polarizing film / reliable support layer / condensing layer is coated.
  • the composite reflective polarizing film including the light collecting layer may be manufactured.
  • steps (a) to (c) may be performed regardless of the order, and thus, the present invention does not specifically limit any particular order.
  • the composite reflective polarizing film manufactured according to the second embodiment described above includes a reliability supporting layer 300 for maintaining the reliability of the reflective polarizing film, and includes a light collecting layer 600 in order to increase condensing to express improved optical properties.
  • the light collecting layer 600 includes a support part 620 that performs a function of supporting the light collecting layer, and when the thickness of the reliability support layer 300 is increased to ensure high reliability, the appearance of fine lines or bends is increased. Instead of reducing the change, a warpage phenomenon may occur frequently in which the composite reflective polarizer film is warped as a bimetal as a whole due to the difference in coefficient of thermal expansion between the reflective polarizer film and the reliability support layer.
  • the support 620 for supporting the light collecting layer 600 provided to increase the light collecting power is divided and shared by the reliability support layer 300 to maintain the reliability of the composite reflective polarizing film without thickening the reliability support layer 300 It is possible to prevent warpage of the composite reflective polarizing film as a whole, to minimize the deterioration of optical properties such as luminance, which may occur by providing a support layer, and thus may implement the desired physical properties of the present invention.
  • the composite reflective polarizing film according to the third embodiment of the present invention comprises a reflective polarizing film in which a polymer is dispersed in the substrate, the composite reflective polarizing film is formed on the upper surface of the reflective polarizing film Light diffusion layer; A reliability support layer formed on a lower surface of the reflective polarizing film; And a multi-functional layer formed under the reliability support layer to guide and collect light irradiated from the light source, and is implemented to satisfy the following conditions (1) and (2).
  • the reliability support layer has a thermal expansion coefficient of 4 to 35 ⁇ m / m ⁇ ⁇ in a temperature range of 70 to 80 ° C, and (2) a haze value of the composite reflective polarizing film is 65% or more.
  • the reliability support layer may have a thickness of 10 ⁇ m to 300 ⁇ m, more preferably 60 ⁇ m to 220 ⁇ m, even more preferably in order to minimize a decrease in luminance due to an increase in the thickness of the support layer and to achieve a desired reliability. Thickness may be 80 to 200 ⁇ m. Through this, it is possible to minimize the deterioration of luminance that may occur by including the reliability support layer, and at the same time, to realize the properties of the composite reflective polarizing film such as desired reliability.
  • the desired reliability may not be expressed only by the light guide layer of the multi-functional layer described below, and the wrinkle of the reflective polarizing film may be increased even if the thickness of the light guide layer of the multi-functional layer is increased to improve the reliability. Appearance changes such as bending and bending may occur.
  • a multi-functional layer including a thick light guide layer can significantly reduce optical properties such as luminance.
  • the thickness of the reliability support layer exceeds 300 ⁇ m the brightness can be significantly reduced, the thickness of the thickness of the reliability support layer is not very desirable for the thinning of the composite reflective polarizing film, the backlight unit including the composite reflective polarizing film
  • the use may be limited in view of the slimming trend of the display panel including such a unit.
  • the thickness of the multi-functional layer to be described later is reduced due to the increase in the thickness of the reliability support layer, there is a problem that can not implement the effect according to the desired multi-functional layer.
  • the multi-functional layer may include a light pattern layer and a micropattern layer including a prism pattern formed on one surface of the light guide layer.
  • the micropattern layer is the same as the description of the micropattern layer of the light condensing layer in the second embodiment, and thus a detailed description thereof will be omitted.
  • the light guide layer serves to guide the light irradiated from the light source and at the same time supports the micropattern layer included in the multi-functional layer.
  • the light guide layer shares the role of the above-described reliability support layer, thereby ensuring the reliability of the composite reflective polarizing film.
  • it should include a fine pattern layer to be described later, in which case, the fine pattern layer is provided with a separate support layer for supporting it, as in the second embodiment described above.
  • the multi-functional layer included in the present invention can support the micropattern layer through the light guide layer without a separate support layer for supporting the micropattern layer, and can reduce optical characteristics such as luminance by not providing a separate support layer. At the same time it can be more advantageous for the thinning of the optical film included in the backlight unit.
  • the light guide layer may partially play the role of the reliability support layer in terms of reliability, and thus, the thickness of the reliability support layer may be reduced, thereby realizing all the desired physical properties and at the same time providing the optical film. It is very preferable because it can thin.
  • the material of the light guide layer may be used without limitation in the case of the material of the light guide layer commonly used in the art, and as a preferable example thereof, polycarbonate-based, polysulfone-based, and polyacrylate 1 type or a polystyrene, polyvinyl chloride, polyvinyl alcohol, poly norbornene, or polyester It may contain two or more kinds.
  • the optical properties are excellent, but the heat resistance is not good, and thus it is not preferable to increase the reliability of the composite reflective polarizing film, and the material is very hard and easily cracked.
  • the composite reflective polarizing film may not be compounded through a continuous manufacturing process, and as each layer needs to be laminated on the individually cut light guide layer, the production process may be complicated and productivity may be degraded.
  • polycarbonate in consideration of the remarkably excellent support for the fine pattern layer, product cost, heat resistance, light guide, and the flexibility to wind the optical film on the roller in the manufacturing process It is preferable to include a series.
  • the light guide layer can be continuously combined with other layers without being cut, and the film can be wound on a roller in the compounding process, thereby increasing productivity.
  • the thickness of the light guide layer may be designed differently depending on the minimum thickness necessary to maintain the function of the light guide layer, the height of the fine pattern layer formed on the layer, the total thickness of the composite reflective polarizing film, and the desired physical properties such as minimizing the luminance reduction.
  • the thickness of the light guide layer exceeds 1000 ⁇ m, the brightness may be significantly reduced, and the thickness of the light guide layer becomes thick, which is not very desirable for thinning the composite reflective polarizing film, and the backlight unit including the composite reflective polarizing film
  • the use may be limited in view of the slimming trend of the display panel including such a unit.
  • the total thickness of the reliability support layer and the light guide layer has a constant thickness range, and the increase in the thickness of the light guide layer causes a decrease in the thickness of the reliability support layer and thus reliability.
  • the support layer may not prevent the occurrence of fine wrinkles or bends in the reflective polarizing film, which may be very undesirable in terms of reliability of the composite reflective polarizing film.
  • the reliability support layer and the multi-functional layer may further include a second primer layer for strengthening the adhesion, which is the same as the above-described second embodiment, a detailed description thereof will be omitted.
  • the third embodiment described above (A) forming a light diffusion layer on the upper surface of the reflective polarizing film; (B) laminating the upper surface of the reliability support layer to abut the lower surface of the reflective polarizing film; And (C) forming a multifunctional layer on the bottom surface of the reliability support layer; To include, but including, step (A) to (B) can be prepared by performing irrespective of the order.
  • Steps (A) to (C) correspond to steps (a) to (c) of the second embodiment described above, except that the multi-functional layer is formed in place of the light collecting layer of step (c). Are the same, and a detailed description thereof will be omitted.
  • the composite reflective polarizing film prepared according to the third to third embodiments of the present invention may have a haze value of 65% or more, preferably 73% or more, more preferably 85 Can be more than%.
  • a haze value of 65% or more, preferably 73% or more, more preferably 85 Can be more than%.
  • the complex reflective polarization film described above may be used to improve light efficiency by being employed in a light source assembly or a liquid crystal display including the same.
  • the light source assembly is classified into a direct type light source assembly in which the lamp is located at the bottom, an edge type light source assembly in which the lamp is located at the side, and the like.
  • the complex reflective polarizing film according to embodiments of the present invention may be employed in any kind of light source assembly. .
  • the present invention is also applicable to a back light assembly disposed below the liquid crystal panel and a front light assembly disposed above the liquid crystal panel.
  • a complex reflective polarization film according to one embodiment as shown in FIG. 5 or FIG. 26 is applied to a liquid crystal display including an edge type light source assembly.
  • FIG. 30 is a cross-sectional view of a liquid crystal display device according to an exemplary embodiment of the present invention, wherein the liquid crystal display device 2000 includes a backlight unit 2400 and a liquid crystal panel assembly 2500.
  • the backlight unit 2400 includes a composite reflective polarizing film 2111 that modulates optical characteristics of the emitted light, wherein the other components included in the backlight unit and the positional relationship between the other components and the composite reflective polarizing film 2111 May vary depending on the purpose and is not particularly limited in the present invention.
  • the light guide 2410 As shown in FIG. 30, the light guide 2410, the light guide plate 2420 for guiding light emitted from the light source 2410, and the reflective film 2315 disposed under the light guide plate 2420. ) And a composite reflective polarizing film 2111 disposed on the light guide plate 2420.
  • the light sources 2410 are disposed at both sides of the light guide plate 2420.
  • the light source 2410 may be, for example, a light emitting diode (LED), a cold cathode fluorescent lamp (CCFL), a hot cathode fluorescent lamp (HCFL), an external electrofluorescent lamp (EEFL), or the like.
  • the light source 2410 may be disposed only on one side of the light guide plate 2420.
  • the light guide plate 2420 moves the light emitted from the light source 2410 through total internal reflection and emits upward through scattering patterns formed on the bottom surface of the light guide plate 2420.
  • a reflective film 2415 is disposed below the light guide plate 2420 to reflect light emitted downward from the light guide plate 2420 upward.
  • the complex reflective polarizing film 2111 is disposed on the light guide plate 2420. Since the composite reflective polarizing film 2111 has been described in detail above, redundant description thereof will be omitted. Other optical sheets may be further disposed above or below the composite reflective polarizing film 2111. For example, a liquid crystal film that partially reflects incident circularly polarized light, a retardation film that converts circularly polarized light into linearly polarized light, and / or a protective film may be further provided.
  • the light source 2410, the light guide plate 2420, the reflective film 2415, and the composite reflective polarizing film 2111 may be received by the bottom chassis 2440.
  • the liquid crystal panel assembly 2500 includes a first display panel 2511, a second display panel 2212, and a liquid crystal layer (not shown) interposed therebetween, and includes a first display panel 2511 and a second display panel 2412. It may further include a polarizing plate (not shown) attached to each surface.
  • the liquid crystal display 2000 may further include a top chassis 2600 that covers an edge of the liquid crystal panel assembly 2500 and surrounds side surfaces of the liquid crystal panel assembly 2500 and the backlight unit 2300.
  • FIG. 31 is an example of a liquid crystal display device employing the composite reflective polarizing film of the present invention, in which a reflecting plate 3280 is inserted into a frame 3270, and a cold cathode fluorescent lamp 3290 is provided on an upper surface of the reflecting plate 3280. ) Is located.
  • An optical film 3320 is positioned on an upper surface of the cold cathode fluorescent lamp 3290, and the optical film 3320 is in the order of a diffuser plate 3321, a composite reflective polarizing film 3322, and an absorption polarizing film 3323.
  • the components included in the optical film and the stacking order between the respective components may vary depending on the purpose, and some components may be omitted or provided in plurality.
  • a retardation film (not shown) or the like may also be inserted at an appropriate position in the liquid crystal display device.
  • the liquid crystal display panel 3310 may be inserted into the mold frame 3300 on the upper surface of the optical film 3320.
  • the light irradiated from the cold cathode fluorescent lamp 3290 reaches the diffusion plate 3321 of the optical film 3320.
  • the light transmitted through the diffuser plate 3321 passes through the composite reflective polarizing film 3322 in order to propagate the light in the vertical direction with respect to the optical film 3320.
  • the P-wave transmits the reflective polarizing film without loss, but in the case of the S-wave, light modulation (reflection, scattering, refraction, etc.) occurs and is reflected by the reflecting plate 3280, which is the back of the cold cathode fluorescent lamp 3290, and the After the light is randomly changed to P or S waves, the light passes through the composite reflective polarizing film 3322 again. Thereafter, after passing through the absorption polarizing film 3323, the liquid crystal display panel 3310 is reached. Meanwhile, the cold cathode fluorescent lamp 3290 may be replaced with an LED.
  • Embodiments described above are applied to the composite reflective polarizing film according to the embodiments of the present invention, it can effectively exhibit a plurality of light modulation characteristics, the brightness can be improved, the light leakage, bright lines do not generate foreign matter Appearance of the appearance can be prevented and at the same time there is an advantage that can ensure the reliability of the composite reflective polarizing film in a high temperature and high humidity environment in which a liquid crystal display device is used.
  • the light diffusing layer and the light collecting layer having respective functions are integrated into the reflective polarizing film, the thickness of the light source assembly can be reduced and the assembly process can be simplified. Accordingly, the image quality of the liquid crystal display including the light source assembly may be improved.
  • the use of the reflective polarizing film has been described based on the liquid crystal display, but the present invention is not limited thereto, and may be widely used in flat panel display technologies such as projection displays, plasma displays, field emission displays, and electroluminescent displays.
  • PCTG polycyclohexylene dimethylene terephthalate
  • thermal stabilizer containing phosphate The raw material was put into the 1st extrusion part and the 2nd extrusion part, respectively.
  • PCTG polycyclohexylene dimethylene terephthalate
  • the extrusion temperature of the base component and the dispersion component was 245, and the I.V.
  • the polymer flow was corrected, and the dispersion was randomly dispersed in the substrate by passing through the flow path to which the filter mixer was applied, and then the skin layer component was laminated on both sides of the substrate layer component.
  • the polymer was induced to spread in the coat hanger die of FIGS. 18 and 19 to correct the flow rate and pressure gradient.
  • the width of the die inlet was 200 mm
  • the thickness was 10 mm
  • the width of the die outlet was 1,260 mm
  • the thickness was 2.5 mm
  • the flow rate was 1.0 m / min.
  • a smoothing process was then performed on the cooling and casting rolls and stretched six times in the MD direction.
  • PEN polyethylene naphthalate
  • the refractive index of 38 wt% of polycyclohexylene dimethylene terephthalate (PCTG) polymerized at 2 molar ratio and 2 wt% of the thermal stabilizer containing phosphate was 1.58.
  • the core layer thickness was 120 ⁇ m
  • the skin layer thickness was 40 ⁇ m, respectively
  • the total thickness of the reflective polarizing film was 200 ⁇ m.
  • a light diffusing layer including a urethane acrylic microlens pattern having a refractive index of 1.59 was formed on the upper surface of the reflective polarizing film through the prepared reflective polarizing film. At this time, the height of the lens in the microlens pattern was 20 ⁇ m.
  • the height of the lenticular lens of Example 8 was 20 ⁇ m and the pitch was 40 ⁇ m
  • the height of the prism pattern of Example 9 was 20 ⁇ m and the pitch was 40 ⁇ m.
  • Example 10 a PET film (EXCELL, Toray Advanced Materials) having a thermal expansion coefficient of 24.69 ⁇ m / m ⁇ ⁇ was used at a temperature range of 70 to 80 ° C.
  • Example 11 a PET film (Toyobo Co., Ltd.) having a coefficient of thermal expansion of 27.27 ⁇ m / m ⁇ ⁇ was used at a temperature range of 70 to 80 ° C.
  • the plate-shaped polymer dispersed reflective polarizing film was subjected to a process as shown in FIG. 32. Specifically, PEN having a refractive index of 1.65 as a first component and dimethyl terephthalate and dimethyl-2,6-naphthalene dicarboxylate as a second component in a molar ratio of 6: 4 are mixed with ethylene glycol (EG) and 1.
  • EG ethylene glycol
  • the polycarbonate alloy of 1.58 was introduced into the first extruded part 220, the second extruded part 221, and the third extruded part 222, respectively.
  • the extrusion temperature of the first component and the second component was 295 ° C. and the Cap.Rheometer was confirmed to correct the polymer flow through IV adjustment.
  • the skin layer was subjected to the extrusion process at a temperature level of 280 ° C.
  • the first component was transferred to the first pressurizing means 230 (Kawasaki gear pump) and the second component was also transferred to the second pressurizing means 231 (Kawasaki gear pump).
  • the discharge amount of the first pressurizing means is 8.9 kg / h in order, respectively, and the discharge amount of the second pressurizing means is 8.9 kg / h.
  • An island-in-the-sea composite product was prepared using the island-in-the-sea extrusion mold as shown in FIG. 33.
  • the number of island component layers of the fourth mold distribution plate S4 among the island-in-the-sea extrusion molds was 400, the diameter of the hole in the island component supply passage was 0.17 mm, and the number of island component supply passages was 25,000, respectively.
  • the diameter of the discharge port of the sixth mold distribution plate was 15 mm x 15 mm.
  • the width of the die inlet is 200 mm
  • the thickness is 20 mm
  • the width of the die outlet is 960 mm
  • the thickness is 2.4 mm
  • the flow rate was 1 m / min.
  • a smoothing process was then performed on the cooling and casting rolls and stretched six times in the MD direction. As a result, the long axis length of the first component was not changed, but the short axis length was reduced. Thereafter, heat setting was performed through an IR heater at 180 ° C. for 2 minutes to prepare a reflective polarizing film in which a polymer as shown in FIG.
  • the refractive index of the first component of the prepared reflective polarizing film was (nx: 1.88, ny: 1.64, nz: 1.64) and the refractive index of the second component was 1.64.
  • the aspect ratio of the polymer was approximately 1/180000, the number of layers was 400 layers, the short axis length (thickness direction) was 84 nm, the major axis length was 15.5 mm, and the average optical thickness was 138 nm.
  • the prepared reflective polarizing film core layer thickness was 59 ⁇ m, and the total thickness of the skin layer was 141 ⁇ m.
  • a PET film (TSI) having a thermal expansion coefficient of 36.25 ⁇ m / m ⁇ ° C was used at a temperature range of 70 to 80 ° C.
  • the panel was assembled on a 32 "direct backlight unit equipped with a composite reflective polarizer film, a diffuser plate, a diffusion sheet, a prism sheet, and a luminance-enhanced film.
  • the number of bright lines was evaluated as 0 very good, 1 good, 2 to 3 normal, and 4 to 5 or more defective.
  • the degree of polarization was measured using an OTSKA RETS-100 analyzer.
  • Haze was measured using a haze and permeability measuring instrument (manufactured by Nippon Denshoku Kogyo Co.).
  • the appearance of the composite reflective polarizing film was visually observed to evaluate whether the foreign material in the film was visible to the naked eye.
  • the change was observed up to 1000 hours to evaluate whether the composite reflective polarizing film had a change in appearance such as crying or wrinkles. .
  • the case of no change in appearance was represented by 0, and as the degree of change was severe, it was represented by 1 to 5.
  • Examples 1 to 5 were superior in brightness, polarization degree, and bright line display as compared with Examples 6 and 7.
  • Example 1 belonging to the range of 1/3 group showed excellent optical properties compared to Examples 2 to 4 that do not satisfy this. Furthermore, the optical properties of Example 1 were very excellent compared to Example 5, where the content of Group 1 was out of range.
  • Example 1 is more excellent in physical properties such as foreign material display.
  • the reliability of the support layer may be lower than that of Examples 1 and 10 when the coefficient of thermal expansion exceeds 25 ⁇ m / m ⁇ ° C. .
  • Example 12 changed to a plate-shaped polymer dispersion type reflective polarizing film, it can be seen that the optical properties such as brightness, polarization degree, etc. are much worse than Example 1.
  • Example 1 including the reliability support layer
  • Comparative Example 1 which includes the same configuration and does not include the reliability support layer, has the effect of improving the luminance due to the inclusion of the reliability support layer, but the reliability is high. It can be seen that the significantly decreased.
  • Comparative Example 4 that does not satisfy the linear expansion coefficient of the reliability support layer according to the present invention it can be confirmed that the desired reliability can not be achieved.
  • PCTG polycyclohexylene dimethylene terephthalate
  • thermal stabilizer containing phosphate The raw material was put into the 1st extrusion part and the 2nd extrusion part, respectively.
  • PCTG polycyclohexylene dimethylene terephthalate
  • the extrusion temperature of the base component and the dispersion component is set to 245 ° C. and the Cap.
  • the polymer flow was corrected, and the dispersion was randomly dispersed in the substrate by passing through the flow path to which the filter mixer was applied, and then the skin layer component was laminated on both sides of the substrate layer component.
  • the polymer was induced to spread in the coat hanger dies of FIGS. 19 and 20 to correct flow rates and pressure gradients. Specifically, the width of the die inlet was 200 mm, the thickness was 10 mm, the width of the die outlet was 1,260 mm, the thickness was 2.5 mm, and the flow rate was 1.0 m / min. A smoothing process was then performed on the cooling and casting rolls and stretched six times in the MD direction.
  • PEN polyethylene naphthalate
  • the refractive index of 38 wt% of polycyclohexylene dimethylene terephthalate (PCTG) polymerized at 2 molar ratio and 2 wt% of the thermal stabilizer containing phosphate was 1.58.
  • the core layer thickness was 120 ⁇ m
  • the skin layer thickness was 40 ⁇ m, respectively
  • the total thickness of the reflective polarizing film was 200 ⁇ m.
  • a light diffusing layer including a urethane acrylic microlens pattern having a refractive index of 1.59 was formed on the upper surface of the reflective polarizing film through the prepared reflective polarizing film. At this time, the height of the lens in the microlens pattern was 20 ⁇ m.
  • the DPHA Dipentaerythritol Hexaacrylate
  • PET polyethylene terephthalate
  • EXCEL Toray Advanced Materials
  • DPPA Dipentaerythritol Pentaacylate
  • TMPTA trimethylolpropane triacylate
  • PEA phenoxyethylacrylate
  • IBOA isobornyl methacrylate
  • 2-hydroxyethyl Methacrylate After preparing a reliable support layer having a thickness of 5 ⁇ m of a second primer including 8 wt% of (2-HEMA) and 5 wt% of 2-Hydroxyethyl acrylate (2-HEA), the second primer layer and the prepared light collecting layer were The prism pattern portion was bonded to abut.
  • the light collecting layer is biaxially stretched four times in the longitudinal direction and the transverse direction as a supporting part, and then heat-fixed to 190.
  • the thickness of the polyethylene terephthalate (PET) film (EXCEL, Toray Advanced Materials) is 100 ⁇ m. It was prepared to include a urethane acrylic prism pattern (20 mu m in height, 40 mu m in pitch) having a refractive index of 1.59 through the same process.
  • DPHA Dipoentaerythritol Hexaacrylate
  • DPPA Dipoentaerythritol Pentaacylate
  • TMPTA trimethylolpropane triacylate
  • PEA phenoxyethyl acrylate
  • IBOA methacrylate
  • 2-HEMA 2-hydroxyethyl methacrylate
  • 2-HEA 2-Hydroxyethyl acrylate
  • Example 16 a PET film (EXCELL, Toray Advanced Materials) having a thermal expansion coefficient of 24.69 ⁇ m / m ⁇ ⁇ was used at a temperature range of 70 to 80 ° C.
  • Example 17 a PET film (Toyobo Co., Ltd.) having a thermal expansion coefficient of 27.27 ⁇ m / m ⁇ ⁇ was used at a temperature range of 70 to 80 ° C.
  • Example 12 It was prepared in the same manner as in Example 13, but instead of the random dispersed reflective polarizing film, a composite reflective polarizing film as shown in Table 3 was prepared using the plate-shaped polymer dispersed reflective polarizing film of Example 12.
  • the composite reflective polarizing film of Table 4 was prepared in the same manner as in Example 13 except that the thickness of the reliability supporting layer and / or the light collecting layer support was changed under the conditions of Table 4 below.
  • a PET film (TSI) having a thermal expansion coefficient of 36.25 ⁇ m / m ⁇ ° C was used at a temperature range of 70 to 80 ° C.
  • Example 13 Through Examples 13 to 15, it can be seen that the shape of the micropattern included in the light diffusion layer is significantly superior in the appearance of haze properties than when the microlens is a prism or lenticular shape. In the physical properties of Example 13 it can be seen that better.
  • Example 19 changed to a plate-shaped polymer dispersion type reflective polarizing film, it can be seen that the optical properties such as brightness, polarization degree, etc. are much worse than those of Example 13.
  • Comparative Example 5 which does not include a light collecting layer in comparison with Example 13, it can be seen that the optical properties such as luminance is significantly reduced. In addition, although the wrinkles or bending did not occur on the surface of the film, it can be seen that the bending of the film as a whole occurred.
  • Comparative Example 6 which does not include the reliability support layer, optical properties such as luminance were expressed at a level similar to that of Example 13, but wrinkles and curvatures occurred on the surface appearance of the film, and it was confirmed that the film was bent as a whole.
  • Example 21 which is not satisfied with Equation 2
  • Example 22 has a thickness of the light collecting layer. Too thin, it can be seen that the luminance is lower than that of Example 1, where the sum of the thicknesses of the reliability support layer and the light collecting layer is similar.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)
  • Laminated Bodies (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

La présente invention concerne un procédé de fabrication d'un film polarisant réfléchissant composite et, plus spécifiquement, un procédé de fabrication d'un film polarisant réfléchissant composite qui rend minimale une perte de lumière, possède à la fois une excellente brillance et une excellente fiabilité dans un processus de fabrication de module pour un afficheur et similaires ou même dans un environnement à température/humidité élevée lors de l'utilisation, possède une excellente qualité extérieure de film, et est remarquablement excellent en termes de reproductibilité des couleurs.
PCT/KR2016/006933 2015-12-29 2016-06-29 Film polarisant réfléchissant composite WO2017115957A1 (fr)

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