KR20160080679A - Complex reflective polarized light film - Google Patents

Abstract

The present invention relates to a complex reflective polarizing film. More specifically, the present invention relates to a complex reflective polarizing film which minimizes an optical loss, has excellent reliability even in a module manufacturing process of a display or the like or in a using environment of high temperature and humidity while having excellent brightness, has an excellent exterior quality, and has significantly excellent color reproductivity. The complex polarizing film comprises: a light diffusion layer; a reliability support layer; and a multi-functional layer.

Description

Complex reflective polarized light film < RTI ID = 0.0 >

The present invention relates to a composite reflective polarizing film and, more particularly, to a composite reflective polarizing film which is capable of minimizing optical loss, modularizing processes such as brightness and display, The present invention relates to a composite reflective polarizing film in which functions such as excellent reliability in a high temperature / high humidity environment, excellent quality of a film appearance, and excellent color reproducibility are integrally combined.

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

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

The optical film used in such a liquid crystal display does not necessarily have a high utilization efficiency of light emitted from the backlight. This is because at least 50% of the light emitted from the backlight is absorbed by the back side optical film (absorption type polarizing film). Thus, a reflective polarizing film may be provided between the optical cavity and the liquid crystal assembly to enhance the utilization efficiency of the backlight in the liquid crystal display.

The reflective polarizing film is required to reduce the optical performance of the reflective polarizing film in accordance with the thickness of the display panel to be slim, and to reduce the thickness of the reflective polarizing film, thereby simplifying the manufacturing process, minimizing defects in the manufacturing process, Continuous research is ongoing.

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

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

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

However, such a conventional reflective polarizing film has such a structure that an isotropic optical layer and an anisotropic optical layer having different refractive indexes are alternately laminated and stretched to have optical thickness and refractive index between each optical layer that can be optimized for selective reflection and transmission of incident polarized light. There is a problem that the manufacturing process of the reflective polarizing film is complicated. Particularly, 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 in accordance with a wide incident angle range of the incident polarized light, so that the number of stacked layers of the optical layer excessively increases and the production cost exponentially There was an increasing problem. Further, there is a problem that optical performance is deteriorated due to optical loss due to the structure in which the number of layers of the optical layer is excessively formed.

2 is a cross-sectional view of a conventional multilayer reflective polarizing film (DBEF). Specifically, in the multilayer reflective polarizing film, the skin layers 9 and 10 are formed on both sides of the substrate 8. The substrate 8 is divided into four groups (1, 2, 3, 4), where each of the isotropic and anisotropic layers is alternately layered to form about 200 layers. Separate bonding layers 5, 6 and 7 are formed between the four groups 1, 2, 3 and 4 forming the substrate 8, respectively. In addition, since each group has a very thin thickness of about 200 layers, these groups often contain a protective layer (PBL) since individual groups can be damaged if they are individually pneumatically shipped. In this case, there is a problem that the thickness of the base material becomes thick and the production cost rises. In addition, since the reflective polarizing film included in the display panel is limited in thickness of the base material in order to make it slim, when an adhesive layer is formed on the base material and / or the skin layer, the base material is reduced by the thickness thereof. there was. Furthermore, since the inside of the substrate and the substrate and the skin layer are bonded with the adhesive layer, there is a problem that when the external force is applied, the elapsed time elapses, or the storage place is poor, delamination occurs. In addition, not only the defect rate is excessively increased in the process of adhering the adhesive layer, but also the destructive interference to the light source occurs due to the formation of the adhesive layer.

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

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

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

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

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

As described above, the reflective polarizing films proposed so far have all the disadvantages. Particularly, the multi-layer reflective polarizing films have a problem in that the production cost is remarkably high because they are used in actual products, The polymer dispersion type reflective polarizing film in which the polymer is dispersed in the substrate may be more preferable because of problems such as poor quality due to the intervention of foreign matter generated during production, complexity of the manufacturing process, and reduction of brightness due to a very large amount of adhesive layer .

However, since the polymer dispersed type reflective polarizing film developed up to now has a translucency of the base material and foreign objects are displayed on the outer surface of the film, the defect ratio of the appearance is large, and the light leakage, the bright line appearance phenomenon, the narrow viewing angle, Is lowered.

In addition, there is a problem that the reliability is remarkably reduced due to bending of the reflective polarizing film due to high heat conditions applied in a process of manufacturing a reflective polarizing film as a module such as a backlight unit and / or heat generated in an environment where such a module is used there was.

Furthermore, in order to solve such a problem, the composite film obtained by adding a separate structure to the polymer-dispersed reflective polarizing film can not solve the problem of lowering the reliability of the reflective polarizing film. At the same time, there is a problem that the luminance is remarkably reduced, and when the decrease in the luminance is minimized, it is difficult to prevent the appearance of foreign objects in the appearance, and all the desired physical properties can not be satisfied at the same time.

Further, a backlight unit (BLU) included in a typical display includes a light guide plate for guiding light emitted from a light source such as an LED or a CCFL. The backlight unit includes a reflective polarizing film, a light guide plate, It is very difficult to attain slimming of the entire thickness of the backlight unit unless the respective films are thinned when the films are laminated separately, and since a line is required to be laminated on each film in the manufacturing process, There is a problem that the productivity is remarkably lowered.

Therefore, it is urgently required to develop a composite reflective polarizing film capable of simultaneously achieving all desired properties while achieving slimness and improving productivity.

DISCLOSURE Technical Problem The present invention has been devised to solve the problems described above, and it is an object of the present invention to provide a method for manufacturing a module, such as minimizing optical loss, / Complex reflection polarizing film in which functions such as excellent reliability in an environment of high humidity, excellent quality of film appearance and excellent color reproducibility are integrally combined.

According to an aspect of the present invention, there is provided a composite reflective polarizing film comprising a reflective polarizing film in which a polymer is dispersed in a substrate, the composite reflective polarizing film comprising: a light-diffusing layer formed on an upper surface of a reflective polarizing film; A reliable supporting layer formed on a lower surface of the reflective polarizing film; And a multi-functional layer formed on the lower portion of the reliability supporting layer and adapted to guide and condense the light emitted from the light source.

According to a preferred embodiment of the present invention, the light-diffusing layer may be formed by curing a photo-curable polymer resin or a thermosetting polymer resin including at least one polymer resin.

According to another preferred embodiment of the present invention, the light-diffusing layer includes at least one fine pattern layer selected from the group consisting of a prism, a lenticular, a microlens, a triangular pyramid, and a pyramid pattern; And a bead coating layer; Or the like.

According to another preferred embodiment of the present invention, the light diffusing layer includes a fine pattern layer, and the fine pattern layer may include a microlens.

According to another preferred embodiment of the present invention, the reliability supporting layer may be a polyester film stretched in at least one direction.

According to another preferred embodiment of the present invention, the thickness of the reflective polarizing film may be 80 to 320 탆.

According to another preferred embodiment of the present invention, a first primer layer for enhancing adhesion between the reflective polarizing film and the reliable supporting layer may be further included.

According to another preferred embodiment of the present invention, at least one of the reliability supporting layer and the light guide layer of the multi-functional layer may satisfy a thermal expansion coefficient of 4 to 35 탆 / m 占 폚 at a temperature condition of 70 to 80 占 폚.

According to another preferred embodiment of the present invention, the reflective polarizing film includes a base material and a plurality of dispersing bodies contained in the base material, the plurality of dispersing materials transmitting the first polarized light irradiated from the outside and reflecting the second polarized light, Wherein at least 80% of the plurality of dispersions contained in the base material have different refractive indexes in at least one axial direction from the base material, and the aspect ratio of the minor axis length to the major axis length Is 1/2 or less and the aspect ratio is 1/2 or less is included in at least three groups according to the cross-sectional area, the first group of the disperse bodies of the group is 0.2 to 2.0 탆 ² , and the second group dispersion of the cross-sectional area is less than ² 5.0㎛ from 2.0㎛ ^2, greater than the cross-sectional area of the dispersion according to the third group is ² or less from 10.0㎛ 5.0㎛ than ^2, the dispersion of the first group to third group is randomly It may comprise; open core layer.

According to another preferred embodiment of the present invention, the reflective polarizing film may further include an integrated skin layer formed on at least one side of the core layer.

According to another preferred embodiment of the present invention, the number of dispersions of the third group among the dispersions having the aspect ratio of 1/2 or less may be 10% or more.

According to another preferred embodiment of the present invention, the number of dispersions of the first group among the dispersions having the aspect ratio of 1/2 or less may be 30 to 50%, and the number of dispersoids of the third group may be 10 to 30% .

According to another preferred embodiment of the present invention, the ratio of the number of dispersions of the first group to the number of dispersions of the third group among the dispersions having the aspect ratio of 1/2 or less may be 3 to 5: 1.

According to another preferred embodiment of the present invention, the refractive index of the substrate and the dispersion body may be 0.05 or less in refractive index with respect to the two axial directions, and the difference in refractive index with respect to the remaining one axial direction may be 0.1 or more.

According to another preferred embodiment of the present invention, the reflective polarizing film may be stretched in at least one axial direction.

According to another preferred embodiment of the present invention, the multi-functional layer includes a fine pattern layer for condensing light emitted from a light source; And a light guide layer formed below the fine pattern layer and supporting the fine pattern layer and guiding light emitted from the light source.

According to another embodiment of the present invention, the fine pattern layer may include at least one fine pattern selected from the group consisting of a prism, a lenticular, a microlens, a triangular pyramid, and a pyramid pattern.

According to another preferred embodiment of the present invention, the fine pattern layer may include a prism fine pattern.

According to another preferred embodiment of the present invention, a second primer layer for enhancing adhesion between the reliability supporting layer and the multi-functional layer may be further included.

According to another preferred embodiment of the present invention, the light guide layer may be a polycarbonate-based material.

According to another preferred embodiment of the present invention, the multifunctional layer includes a light guide layer, and the value of the following Equation 1 with respect to the thickness of the light guide layer, the thickness of the reflective polarizing film and the thickness of the reliability support layer may be 2.2 to 6.5 have.

[Equation 1]

According to another preferred embodiment of the present invention, a second primer layer for enhancing adhesion between the reliability supporting layer and the multi-functional layer may be further included.

According to another preferred embodiment of the present invention, the value of Equation (1) for the thickness of the reflective polarizing film, the thickness of the reliability supporting layer and the thickness of the light guide layer of the multi-functional layer may be 2.5 to 5.8.

According to another preferred embodiment of the present invention, the thickness of the reliability supporting layer and the thickness of the light guide layer of the multifunctional layer may be 0.06 to 0.55.

&Quot; (2) "

According to another preferred embodiment of the present invention, the haze value of the composite reflective polarizing film may be 90% or more.

In order to solve the above problems, the present invention provides a backlight unit including a composite reflective polarizing film according to the present invention.

Further, in order to solve the above-described problems, the present invention provides a liquid crystal display device including a backlight unit according to the present invention.

Hereinafter, terms used in this specification will be described.

As used herein, the term " the dispersant has birefringence "means that, when light is irradiated to fibers having different refractive indexes along the direction, the light incident on the dispersant is refracted into two or more lights having different directions.

As used herein, the term "isotropic" means that, when light passes through an object, the refractive index is constant regardless of the direction.

As used herein, the term "anisotropy" means that the optical properties of an object are different depending on the direction of light, and an anisotropic object has birefringence and corresponds to isotropy.

The term "optical modulation" as used herein means that the irradiated light reflects, refracts, scatters, changes the intensity of light, the period of waves, or the nature of light.

As used herein, the term "aspect ratio" means the ratio of the minor axis length to the major axis length based on the vertical cross section in the longitudinal direction of the dispersion.

As used herein, the terms spatially relative, "below", "beneath", "lower", "above", " And can be used to easily describe a correlation between one component and other components as shown in the drawings. Spatially relative terms should be understood in terms of the directions shown in the drawings, including the different directions of components at the time of use or operation. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element . Thus, the exemplary term "below" may include both downward and upward directions. The components can also be oriented in different directions, so that spatially relative terms can be interpreted according to orientation.

Also, these spatially relative terms "upper,""upper,""upper,""lower,""lower," and "lower" include both the meaning of "directly" and "indirectly".

The composite reflective polarizing film according to the present invention has functions of minimizing optical loss, excellent brightness, module manufacturing process such as display, excellent reliability in a high heat / humidity environment during use, excellent quality of film appearance, excellent color reproducibility It can contribute to slimming down the display, and it is possible to remarkably improve the display productivity as the processes of laminating the films performing each function are reduced. Can be achieved.

1 is a schematic view for explaining the principle of a conventional reflective polarizing film.
2 is a cross-sectional view of a currently used multilayer reflective polarizing film (DBEF).
3 is a perspective view of a reflective polarizing film including a bar-shaped polymer.
4 is a cross-sectional view showing a path of light incident on a birefringent graphite sheet used for a reflective polarizing film.
5 is a cross-sectional view of a composite reflective polarizing film according to a preferred embodiment of the present invention.
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.
FIG. 7 is a longitudinal sectional view of the dispersion body used in a preferred embodiment of the present invention. FIG.
8 is a perspective view of a reflective polarizing film according to a preferred embodiment of the present invention.
9 is a perspective view of a composite reflective polarizing film according to a preferred embodiment of the present invention.
10 is a perspective view of a composite reflective polarizing film according to a preferred embodiment of the present invention.
11 is a perspective view of a composite reflective polarizing film according to a preferred embodiment of the present invention.
12 is a perspective view of a composite reflective polarizing film according to a preferred embodiment of the present invention.
13 is a perspective view of a composite reflective polarizing film according to a preferred embodiment of the present invention.
14 is a perspective view of a composite reflective polarizing film according to a preferred embodiment of the present invention.
15 is a cross-sectional view of a light diffusing layer in a composite reflective polarizing film according to a preferred embodiment of the present invention.
16 is a cross-sectional view of a light diffusing layer in a composite reflective polarizing film according to a preferred embodiment of the present invention.
17 is a cross-sectional view of a light diffusing layer in a composite reflective polarizing film according to a preferred embodiment of the present invention.
18 is a perspective view of a multi-functional layer included in a preferred embodiment of the present invention.
Figure 19 is a cross-sectional view of a coat-hanger die, which is a type of preferred flow control that may be applied to the present invention.
Fig. 20 is a side view of Fig. 19. Fig.
21 is a schematic view of a process of forming a fine pattern according to a preferred embodiment of the present invention.
22 is a cross-sectional view showing the detailed structure of the molding part of Fig.
23 is a schematic view of a process of forming a fine pattern of a light diffusion layer according to another preferred embodiment of the present invention.
24 is a schematic view of a process of forming a fine pattern of a light diffusion layer according to another preferred embodiment of the present invention.
25 is a schematic view of a process of forming a fine pattern of a multi-functional layer according to another preferred embodiment of the present invention.
26 is a schematic view of a process of forming a fine pattern of a multi-functional layer according to another preferred embodiment of the present invention.
FIG. 27 is a cross-sectional view of a reflective polarizing film / reliability supporting layer / multi-function layer laminated according to a preferred embodiment of the present invention.
28 is a cross-sectional view of a liquid crystal display device according to a preferred embodiment of the present invention.
29 is a liquid crystal display device employing a composite reflective polarizing film according to a preferred embodiment of the present invention.
30 is a schematic view of an apparatus for producing a plate-shaped polymer dispersed reflective polarizing film included in a preferred embodiment of the present invention.
FIG. 31 is a perspective view showing a coupling structure of a cocoon distribution plate of a sea-island type extrusion cradle capable of producing a plate-shaped polymer dispersed reflective polarizing film included in a preferred embodiment of the present invention.
32 is a sectional view of a plate-shaped polymer dispersed reflective polarizing film according to a preferred embodiment of the present invention.

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

As described above, in the polymer-dispersed reflective polarizing film, since the substrate is translucent and the foreign object is displayed on the outer surface of the film, the defective rate of the appearance is large, and the light leakage, bright line phenomenon, narrow viewing angle, And a typical material of the reflective polarizing film is a polycarbonate-based material and has a very high thermal expansion coefficient at a high temperature, so that a high thermal condition applied in a process of manufacturing a module such as a backlight unit and / There is a problem that the reliability is remarkably reduced, for example, the reflection polarizing film is bent due to heat generated in the environment. Further, a backlight unit (BLU) included in a typical display includes a light guide plate for guiding light emitted from a light source such as an LED or a CCFL. The backlight unit includes a reflective polarizing film, a light guide plate, It is very difficult to attain slimming of the entire thickness of the backlight unit, and since a line is required to be stacked on each film in the manufacturing process, the manufacturing time is increased and the equipment cost is increased There is a problem that the productivity such as productivity is remarkably deteriorated.

Accordingly, the present invention provides a composite reflective polarizing film comprising a reflective polarizing film in which a polymer is dispersed in a substrate, the composite reflective polarizing film comprising: a light-diffusing layer formed on an upper surface of a reflective polarizing film; A reliable supporting layer formed on a lower surface of the reflective polarizing film; And a multifunctional layer formed on the lower portion of the reliability supporting layer and for guiding and condensing the light emitted from the light source, thereby solving the above-mentioned problem. Thus, it is possible to exhibit all functions such as minimization of optical loss, module fabrication such as excellent luminance and display, excellent reliability in a high temperature / humidity environment during use, excellent quality of film appearance, excellent color reproducibility, The thickness of the display can be made thinner than the case of stacking all of the films performing the function, and the display productivity can be remarkably improved by reducing the number of steps of laminating the films performing the respective functions.

5 is a cross-sectional view of a composite reflective polarizing film according to an exemplary embodiment of the present invention. FIG. 5 is a cross-sectional view of a reflective polarizing film 200, A composite reflective polarizing film (1000) formed on a lower surface of a substrate, a reliability supporting layer (300) formed on a lower surface, and a multi functional layer (600) formed on a lower surface of the reliability supporting layer to light and condense light emitted from a light source, The reliability supporting layer 300 may further include a first primer layer 400 for enhancing adhesion between the film 200 and the reliability supporting layer 300 and a second primer layer 400 for enhancing adhesion between the reliability supporting layer 300 and the multi- And may further include a primer layer 500.

First, the reflective polarizing film 200 will be described.

The reflective polarizing film included in the preferred embodiment of the present invention can be inserted into Korean Patent Application No. 2013-0169215 and Korean Patent Application No. 2013-0169217 by the same applicant.

The reflective polarizer film 200 may be a conventional polymer-dispersed reflective polarizer film in which a polymer is dispersed in a substrate. The conventional polymer-injected reflective polarizing film may be a reflective polarizing film for a publicly known tube including a rod-shaped polymer as shown in Fig. 3. The present invention is particularly limited to the shape, the number of the polymer, I never do that.

However, as described above, the reflective polarizing film in which the polymer is dispersed in the conventional substrate has a problem that the light leakage, the bright line viewing phenomenon, the wide viewing angle are narrow, the light loss can not be minimized, and the luminance is lowered.

Accordingly, according to a preferred embodiment of the present invention, the reflective polarizing film comprises a base material and a plurality of dispersing bodies contained in the base material to transmit the first polarized light to be externally irradiated and to reflect the second polarized light, Wherein at least 80% of the plurality of dispersions contained in the substrate have different refractive indexes in at least one axial direction with respect to the substrate, and the aspect ratio of the minor axis length to the major axis length Wherein the dispersoids having an aspect ratio of 1/2 or less are contained in at least three groups according to the cross-sectional area, the first group of the dispersoids have a cross-sectional area of 0.2 to 2.0 占 퐉 ² , and the body cross-sectional area is less than ² from 5.0㎛ 2.0㎛ ^2, greater than the cross-sectional area of the dispersion according to the third group is ² or less from 10.0㎛ 5.0㎛ than ^2, the dispersion of the first group to the third group at random times It can be.

According to another preferred embodiment of the present invention, the reflective polarizing film may include an integrated skin layer formed on at least one surface of the core layer to protect the core layer.

Further, according to another preferred embodiment of the present invention, the reflective polarizing film comprises the above-described base material and the reflective polarized light including a plurality of dispersions contained in the base material and satisfying the conditions according to a preferred embodiment of the present invention The film may be a core layer and an integrated skin layer formed on at least one side of the core layer. The skin layer may further contribute to protection of the core layer.

The reflection polarizing film according to another embodiment including the skin layer and the skin layer may be different in use, and various general liquid crystal display devices such as a display may be provided with a reflection polarizing film And it may be preferable to use a reflective polarizing film not including a skin layer in a portable liquid crystal display device, for example, a portable electronic device, a smart electronic device, or a smart phone, but the present invention is not limited thereto.

On the other hand, the composite reflective polarizing film according to the present invention may include a reliable supporting layer, which will be described later, on one side of the reflective polarizing film to achieve the object of protecting the core layer without providing a skin layer for protecting the core layer.

Hereinafter, the reflective polarizing film will be specifically described with respect to the reflective polarizing film including the skin layer.

Specifically, 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. A core layer 210 in which a plurality of dispersions 212 to 217 are randomly dispersed and arranged in a base material 211 and a skin layer 220 formed integrally on at least one surface of the core layer.

First, the core layer 210 will be described.

In the core layer, 80% or more of a plurality of dispersions contained in the substrate should have an aspect ratio of a minor axis length to a major axis length of 1/2 or less, more preferably 90% or more The aspect ratio value should be 1/2 or less.

Specifically, FIG. 7 is a vertical section in the longitudinal direction of the dispersion used in a preferred embodiment of the present invention, wherein the long axis length is a and the short axis length is b, and the long axis length a and the short axis length b The relative length ratio (aspect ratio) should be less than 1/2. In other words, when the major axis length (a) is 2, the minor axis length (b) should be less than or equal to 1, which is 1/2 thereof. If the dispersion having a ratio of the minor axis length to the major axis length of 1/2 is contained in an amount of 20% or more of the total dispersion, the desired optical properties are difficult to achieve.

The dispersion body having the aspect ratio of 1/2 or less includes three or more groups having different cross-sectional areas. Specifically, in FIG. 6, the first group of dispersions 202 and 203 having the smallest cross-sectional area and the second group of dispersions 204 and 205 having an intermediate cross-sectional area and the third group 206 and 207 having the largest cross- ) Are dispersed randomly. In this case, a sectional area of the first group ² 0.2 ~ 2.0㎛, the cross-sectional area of the second group is ² or less 5.0㎛ from 2.0 ㎛ ^2, greater than the cross-sectional area of the third group is ² or less from 10.0㎛ 5.0㎛ than ^2, the The dispersoids of the first group, the dispersant of the second group and the dispersant of the third group are randomly arranged. If the dispersion of any one of the first to third groups of dispersions is not included, desired optical properties are difficult to achieve (see Table 1).

In this case, preferably, the number of dispersions of the third group among the dispersions having the aspect ratio of 1/2 or less may be 10% or more. If it is less than 10%, improvement in optical properties may be insufficient. More preferably, the number of dispersions corresponding to the first group of the dispersions having the aspect ratio of 1/2 or less is 30 to 50%, and the number of dispersions corresponding to the third group is 10 to 30% This can improve optical properties (see Table 1)

On the other hand, more preferably, when the number of dispersants of the first group / the number of dispersants of the third group is 3 to 5, it may be very advantageous to maximize optical properties (see Table 1)

Preferably, the number of dispersions corresponding to the second group among the dispersions having the aspect ratio of 1/2 or less can satisfy 25 to 45%. Also, the dispersions which are out of the range of the cross-sectional areas of the first to third dispersions may be contained in the dispersion in which the aspect ratio is 1/2 or less. As a result, it is possible to maximize the brightness enhancement while minimizing the light loss and wide viewing angle, while improving the bright line visibility compared to the conventional dispersion type reflective polarizing film.

FIG. 8 is a perspective view of a reflective polarizing film according to an embodiment of the present invention. A plurality of random dispersions 208 extend in the longitudinal direction within a base material 201 of a core layer 210, 220 are formed on the top and / or bottom of the core layer 210. In this case, each of the random dispersions 208 may be elongated in various directions, but it is preferable to elongate in parallel in any one direction, more preferably, elongation in the direction perpendicular to the light irradiated from the external light source Elongation parallel to the trunk is effective in maximizing the light modulation effect.

According to a preferred embodiment of the present invention, a birefringent interface may be formed between the dispersion (first component) contained in the substrate and the substrate (second component). Specifically, in a reflective polarizing film including a dispersion within a substrate, the magnitude of the substantial agreement or inconsistency of the refractive index along the X, Y, and Z axes in space between the substrate and the dispersion body depends on the scattering of the polarized light along its axis . Generally, the scattering ability changes in proportion to the square of the refractive index mismatch. Thus, the greater the degree of discrepancy in refractive index along a particular axis, the more scattered light rays are polarized along that axis. Conversely, when the inconsistency along a particular axis is small, the polarized light rays along the axis are scattered to a lesser degree. When the refractive index of the substrate is substantially coincident with the refractive index of the dispersion along an axis, the incident light polarized by the electric field parallel to this axis is not scattered regardless of the size, shape and density of the dispersion, something to do. Also, when the refractive index along the axis is substantially coincident, the light rays pass through the object without being substantially scattered. More specifically, the first polarized light (P wave) is transmitted without being influenced by the birefringent interface formed at the interface between the substrate and the dispersion body, while the second polarized light (S wave) is transmitted through the birefringent Modulation of light is affected by the interface. As a result, the P wave is transmitted and the S wave is modulated by light such as scattering and reflection of light, resulting in separation of polarized light.

Therefore, since the base material and the dispersion body can form a birefringent interface to cause a light modulation effect, when the base material is optically isotropic, the dispersion material can have birefringence, and conversely, when the base material has optical birefringence The dispersion body may have optical isotropy. Specifically, the refractive index of the refractive index of the x-axis direction of the dispersion nX _1, y is the axial refractive index nY ₁ and z-axis direction nZ _1, the refractive index of the base material nX _2, nY ₂ and nZ when _2, plane birefringence between nX ₁ and nY ₁ may occur. More preferably, at least one of the X, Y, and Z axis refractive indexes of the substrate and the dispersion body may be different, and more preferably, when the elongation axis is the X axis, the difference in refractive indexes in the Y axis and Z axis directions is not more than 0.05 , And the difference in refractive index with respect to the X-axis direction may be 0.1 or more. On the other hand, when the difference in the refractive index is 0.05 or less, it is interpreted as matching.

The thickness of the core layer in the present invention is preferably 20 to 350 占 퐉, more preferably 50 to 250 占 퐉. However, the present invention is not limited thereto. For example, Accordingly, the thickness of the core layer can be designed differently. The number of the total dispersions may be 25,000,000 to 80,000,000 when the thickness of the substrate is 120 占 퐉 based on 32 inch, but is not limited thereto.

Next, the skin layer 220 that can be included on at least one side of the core layer will be described.

The skin layer component may be a conventionally used component and is not particularly limited as long as it is used in a reflective polarizing film. Preferably, the component is polyethylene naphthalate (PEN), co-polyethylene naphthalate (co-PEN) (PS), polymethylmethacrylate (PMMA), polybutylene terephthalate (PBT), polybutylene terephthalate (PBT), and polyethylene terephthalate (PET), polycarbonate Polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene (ABS), polyurethane (PU), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile blend (EVA), polyamide (PA), polyacetal (POM), phenol, epoxy (EP), urea (UF), melanin (MF), unsaturated polyester (UP) Polymers may be used singly or in combination. Can be and is more preferably dimethyl-2,6-naphthalene dicarboxylate, dimethyl terephthalate and ethylene glycol, Im chroman-hexane dimethanol monomers days properly co-polymerization, such as PEN (CHDM).

According to a preferred embodiment of the present invention, the thickness of the skin layer may be 10 to 500 mu m, but is not limited thereto.

On the other hand, when the skin layer is formed, it is also integrally formed between the core layer 210 and the skin layer 220. As a result, deterioration of optical properties due to the adhesive layer can be prevented, and more layers can be added to a limited thickness, so that optical properties can be remarkably improved. Further, since the skin layer is prepared simultaneously with the core layer and then the stretching process is performed, the skin layer of the present invention can be stretched in at least one axial direction, unlike the case of adhering the unstretched skin layer after stretching the conventional core layer . As a result, the surface hardness is improved as compared with the non-drawn skin layer, and the scratch resistance is improved and the heat resistance can be improved.

Next, the light-diffusing layer 100 formed on the upper surface of the reflective polarizing film 200 will be described.

The light diffusing layer 100 maximizes the light collecting effect and prevents irregular reflection on the surface, thereby remarkably improving the brightness. The haze value of the composite reflective polarizing film through scattering of light is increased, It can minimize defects. The light diffusing layer 100 may be formed on the reflective polarizing film 200 or on an adhesive layer (not shown) formed on the reflective polarizing film 200.

According to a preferred embodiment of the present invention, the light diffusion layer 100 may include a fine pattern. The fine pattern is not particularly limited as far as it is a fine pattern capable of improving brightness and improving the light collecting effect, but more preferably the fine pattern is composed of a prism, a lenticular, a microlens, a triangular pyramid and a pyramid pattern , And each of the patterns may be formed by forming a pattern alone or in combination, more preferably, it may be any one or more of a lenticular, a microlens, and a prism, and more preferably, May be a microlens capable of simultaneously satisfying all physical properties.

Specifically, FIG. 9 is a perspective view of a composite reflective polarizing film according to a preferred embodiment of the present invention. In the reflective polarizing film 200, a plurality of dispersing bodies are elongated in the longitudinal direction of the substrate 200, . In this case, each of the dispersing bodies may be elongated in various directions, but it is preferable to elongate them in parallel in any one direction, more preferably in a direction perpendicular to the light irradiated from the external light source Elongation is effective in maximizing the light modulation effect. The light diffusing layer 100 formed on the reflective polarizing film 200 can perform an enhanced light converging function and a brightness enhancing function by including a fine pattern. FIG. 9 shows a light diffusing layer 110 including a lenticular pattern, .

To describe the lenticular pattern more specifically, the height h of the lenticular may be 10 to 50 탆. If the height of the lenticular pattern is less than 10 탆, the pattern may be difficult to implement. If the height of the lenticular pattern is more than 50 탆, the brightness may decrease due to an increase in the total amount of light.

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

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

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

In addition, the lenticular shape may be formed as a pattern having the same height and pitch as shown in Fig. 9, or lenticular patterns 111 having different heights and pitch as shown in Fig. 10 may be mixed.

Meanwhile, FIG. 11 is a perspective view of a composite reflective polarizing film according to a preferred embodiment of the present invention, wherein the light diffusion layer 112 includes a microlens pattern. To describe the microlens pattern specifically, the height of the microlens may be 10 to 50 mu m. If the height of the microlens pattern is less than 10 mu m, the light collecting effect is somewhat deteriorated, and the pattern implementation may be difficult. When the height exceeds 50 mu m, the moiré phenomenon tends to occur and the pattern may appear in the image.

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

Also, the microlens patterns may be formed in a pattern having the same height and diameter as shown in FIG. 11, or microlens patterns 113 having different heights and diameters as shown in FIG. 12 may be mixed. It is ideal that the microlens pattern increases the density to a maximum and has a degree of impregnation of 1/2 because the optical characteristics vary greatly depending on the density and the aspect ratio of the lens.

Meanwhile, FIG. 13 is a perspective view of a composite reflective polarizing film according to an exemplary embodiment of the present invention, wherein the light diffusion layer 113 includes a prism pattern. To describe the prism pattern, the height (a) of the prism may be 10 to 50 탆. If the height of the prism pattern is less than 10 mu m, the base film may be damaged by pressure when manufacturing the shape of the prism pattern portion. If the height exceeds 50 mu m, the light transmittance of the light incident on the light source may be reduced.

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

In addition, 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 heights and pitch as shown in FIG. 14 may be mixed. Such a prism pattern may be made of a material having a refractive index higher than that of the base film. If the refractive index of the base film is higher, a part of the light incident on the back surface of the base film may not be incident on the prism structure Because. Preferably, the prism shape is preferably a linear prism shape, the vertical section is triangular, and the triangle has an angle of 60 to 110 degrees with respect to a vertex opposed to the lower surface.

The light-diffusing layer including the above-described fine pattern may be formed by curing including at least one polymer resin of a photocurable polymer resin or a thermosetting polymer resin. As a preferable example of the polymer resin, a polymer resin including a thermosetting or photocurable acrylic resin may be used. However, the kind of the polymer resin used may be changed depending on the shape of the fine pattern specifically included in the light diffusion layer. For example, the prism pattern may include an unsaturated fatty acid ester, an aromatic vinyl compound, an unsaturated fatty acid and a derivative thereof, and a vinyl cyanide compound such as methacryl nitrile. Specific examples thereof include uretanic acrylate, methacrylic acryl Late resin and the like can be used. The light diffusion layer may be made of a material having a higher refractive index than the reflective polarizing film.

Further, according to a preferred embodiment of the present invention, the light-diffusing layer may include a bead coating layer. 15 to 17 are cross-sectional views of a light diffusion layer according to a preferred embodiment of the present invention. The bead coating layer may be a coating layer (see FIG. 15) in which the beads 108 are included in the resin layer 107, (See Fig. 16), a bead is attached to the upper surface of the resin layer (see Fig. 17) and / or a bead is directly attached to the upper surface of the reflective polarizing film without the resin layer Lt; / RTI > The diameter of the beads may be 0.1 to 100 탆, and when the beads satisfying such diameters are included, excellent optical properties may be realized. The density of the beads in the bead coating layer 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 distance between the beads is too small, the light transmission characteristics may be disadvantageous as the number of beads included per unit area increases. It is preferable that the distance between the beads is about 1 탆 or more.

The beads may include at least one of organic beads and inorganic beads. Examples of the organic beads include acrylic, styrene, melamine formaldehyde, propylene, ethylene, silicone, urethane, methyl (meth) acrylate, polycarbonate A homopolymer or a copolymer obtained by using a monomer can be exemplified. Examples of the inorganic beads include silica, zirconia, calcium carbonate, barium sulfate, and titanium oxide.

The resin constituting the resin layer is not particularly limited in the present invention but may be a UV curable material. Examples of the (meth) acrylate or polyfunctional (meth) acrylate monomer include 2-hydroxyethyl (meth) (Meth) acrylate, 2-hydroxypropyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, butoxyethyl (meth) acrylate, ethyldiethylene glycol Rate, cycle

(Meth) acrylates such as hexyl (meth) acrylate, phenoxyethyl (meth) acrylate, dicyclopentadiene (meth) acrylate, polyethylene glycol (meth) acrylate, polypropylene glycol (Meth) acrylate, isobornyl (meth) acrylate, N-vinylpyrrolidone, N-vinylcaprolactam, diacetone acrylamide, isobutoxymethyl (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, Acrylate, pentaerythritol tetra (meth) acrylate, ethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, polyethylene glycol di (Meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, trimethylolpropane trioxyethyl (meth) acrylate, Acrylate, dicyclopentane di (meth) acrylate, dicyclodecane dimethanol di (meth) acrylate, tripropylene glycol di (meth) acrylate, (Meth) acrylate and the like, and the above listed materials may be used singly or in combination.

In addition to the above-listed resins, additives may further be included, and as the additive, a material having high lubricity may be applied. For example, at least one of a silicone-based additive and a fluorine-based additive may be applied. Specifically, a reactive monomer having a silicon group or a reactive oligomer (for example, a silicone group-containing vinyl compound, a silicon group-containing (meth) acrylate compound, a (meth) acryloxy group-containing organosiloxane, A fluoroalkyl group-containing (meth) acrylate compound, a fluorine polyacrylate, etc.) having a fluorine group or a fluorine group, a reactive monomer or a reactive oligomer having a fluorine group A resin (e.g., polydimethylsiloxane, fluoropolymer, etc.), a silicone group or a surfactant having a fluorine group or an oil (for example, dimethylsilicone oil) may be used alone or in combination.

The content ratio of the UV curable material and the additive may range from 0.001 part by weight to 100 parts by weight: 10 parts by weight, preferably 100 parts by weight: 0.01 parts by weight to 100 parts by weight: 5 parts by weight .

Further, in addition to the UV curable material and the additive, a photoinitiator may be further included. Wherein the photoinitiator is selected from the group consisting of at least one free radical initiator selected from benzyl ketaldehyde, benzoin ethers, acetophenone derivatives, ketoxime ethers, benzophenone, benzo or thioxanthone compounds, onium salts, ferrocenium salts ferrocenium salts, and diazonium salts, or a mixture thereof.

The degree of physical properties of the composite reflective polarizing film may vary depending on the specific shape of the fine pattern described above. Specifically, when the fine pattern is a prism and / or a lenticular shape, While the increase in the haze value of the composite reflective polarizing film may be relatively lower than that in the case of the microlens shape. In addition, when the light diffusion layer does not include a fine pattern and has a bead coating layer, 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 is significantly lowered, The optical properties can be significantly reduced as compared with when the fine pattern is a microlens shape. Accordingly, the shape of the light-diffusing layer can be selected in accordance with the desired physical properties required. However, in order to simultaneously exhibit not only optical characteristics such as light condensation and luminance but also improvement in surface appearance quality by increasing the haze value of the composite reflective polarizing film, It may be more preferable to include a microlens-shaped fine pattern.

Meanwhile, a primer layer (not shown) may be selectively formed on the upper surface of the skin layer 220a of the reflective polarizer film 200. [ Thus, the light diffusion layer 100 can improve the adhesion during lamination and improve the appearance and electrophotographic characteristics. Examples of the material include, but are not limited to, acrylic, ester, and urethane. The adhesive layer can be formed thinner than the other layers, and the thickness of the adhesive layer can be adjusted to improve the light transmittance and reduce the reflectance. The thickness of the adhesive layer may be from 5 nm to 300 nm. If the thickness of the adhesive layer is less than 5 nm, the adhesion between the reflective polarizing film and the light diffusion layer may be insignificant. If the thickness of the adhesive layer exceeds 300 nm, unevenness or molecular aggregation may occur during the adhesive treatment.

Next, the reliability supporting layer 300 formed on the lower surface of the reflective polarizing film 200 will be described.

The reliability supporting layer 300 significantly improves the thermal reliability degradation caused by various processes for manufacturing a backlight unit and the like, and improves the haze, It is possible to remarkably improve appearance defects in which a bright line or the like is displayed on the display panel and to minimize a decrease in luminance that may occur when a separate structure is included for reliability improvement.

The reliability of the composite reflective polarizing film in the description of the present invention means that the reflective polarizing film usually has a very high coefficient of thermal expansion due to the nature of the material thereof and is therefore suitable for manufacturing a module such as a composite reflective polarizing film and a backlight unit and / The surface of the reflective polarizing film is not affected by changes in appearance such as wrinkles and curvature such as curtains and / or deterioration of luminance due to high temperature in a humid environment, and wrinkles and bends appear on the outer appearance, Means that there is no panel unevenness due to a gap difference between the mountain portion and the valley portion and that there is no appearance damage such as being easily torn or damaged in the stretched direction when the reflective polarizing film is stretched on at least one axis .

Meanwhile, the composite reflective polarizing film according to the present invention can significantly improve the reliability as described above, and at the same time, in order to maintain optical properties such as brightness, according to a preferred embodiment of the present invention, The thermal expansion coefficient can be in the range of 4 to 35 占 퐉 / m 占 폚, and more preferably in the temperature range of 70 to 80 占 폚, the thermal expansion coefficient can be in the range of 10 to 25 占 퐉 / m 占 폚. It is possible to prevent a change in appearance such as wrinkles and bending of the reflective polarizing film due to high temperature even in a high temperature and high humidity environment of a module manufacturing process such as a composite reflective polarizing film and a backlight unit and / As the optical property is prevented from deteriorating, excellent composite reflective polarizing film can have excellent reliability. If the above range is not satisfied, there may be a problem that physical properties such as desired optical characteristics, reliability and prevention of defective surface appearance may not be realized. Specifically, there is a problem that a thermal expansion coefficient of 35 μm / m ° C, the problem can be further exacerbated, and the composite reflective polarizing film may not be used in a backlight unit. When the thermal expansion coefficient is less than 4 μm / m · ° C., A reliability supporting layer having a characteristic can greatly deteriorate the optical characteristics, and a material having a thermal expansion coefficient of less than 4 占 퐉 / m 占 폚 while having the optical characteristic required for an optical film is rarely developed, Because it is expensive, it is very difficult to use it as a product reliability virtual trust base.

Specifically, the material of the reliability supporting layer is not particularly limited, but it may preferably be a polyester resin in consideration of optical properties, heat resistance, chemical resistance, mechanical properties and economy. The polyester resin may be at least one selected from the group consisting of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytetramethylene terephthalate (PTT), polyhexylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, (Phenoxy) ethane-4,4'-dicarboxylate, polyethylene isophthalate / nephthalate copolymer, polybutylene terephthalate / isophthalate copolymer and polybutylene terephthalate / decane-dicarboxylate (PET), or modified polyethylene terephthalate, and more preferably polyethylene terephthalate (PET). [0033] The term " polyethylene terephthalate . As a non-limiting example of the modified polyethylene terephthalate, ethyleneglycol as a diol component and a sulfonated metal salt other than terephthalic acid as an acid component may be further included as a monomer. For example, dimethylsulfone isophthalate sodium salt, Can be. Further, it may further include an aromatic polycarboxylic acid other than terephthalic acid as a monomer, and for example, it may be any one or more of dimethyl terephthalate, isophthalate and dimethyl isophthalate. Further, as the diol component, a diol component other than ethylene glycol may be further included as a monomer. Examples of such a diol component include neopentyl glycol, diethylene glycol, neopentyl glycol, 1,3-propanediol, , 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.

Further, the reliability supporting layer may be a film stretched in at least one direction, more preferably a biaxially stretched film, and more preferably a biaxially stretched film in order to further improve physical properties such as improved strength, dimensional stability, It may be a film thermally fixed at 175 to 225 占 폚 after biaxial stretching, more preferably a polyethylene terephthalate film heat-fixed after biaxial stretching.

According to a preferred embodiment of the present invention, the thickness of the reliability supporting layer may be 10 to 300 mu m, and more preferably, the thickness may be increased to minimize the decrease in luminance as the thickness of the supporting layer is increased, More preferably 60 to 220 탆, and still more preferably 80 to 200 탆. This makes it possible to realize the properties of a composite reflective polarizing film such as a desired reliability at the same time while minimizing a luminance drop caused by including a reliability support layer. If the thickness of the reliability supporting layer is less than 10 mu m, the desired reliability can not be exhibited only by the light guide layer of the multifunctional layer to be described later. Even if the thickness of the light guide layer of the multi- Or a change in appearance such as bending may occur. In addition, the multi-functional layer including the light-guiding layer having a large thickness can significantly lower the optical properties such as brightness. In addition, if the thickness of the reliability supporting layer exceeds 300 mu m, the brightness may be remarkably lowered, and the thickness of the reliability supporting layer that is thickened is not preferable for thinning the composite reflective polarizing film. Or the display panel including such a unit is becoming slimmer, there is a problem that its use may be limited. Also, the thickness of the multi-functional layer to be described later may be reduced due to an increase in the thickness of the reliability supporting layer, which may result in failure to realize the desired multi-functional layer effect.

According to a preferred embodiment of the present invention, a first primer layer may be further provided between the reflective polarizing film and the reliability supporting layer for enhancing adhesion.

The first primer layer may be formed by curing a photopolymerizable resin or a thermosetting polymeric resin and including at least one polymer resin. As a specific type of such a polymer resin, any polymer resin capable of minimizing the luminance reduction due to the primer layer can be used without limitation, and examples of the material include silicone polymers, urethane polymers, SU-polymers having a silicone-urethane hybrid structure, acrylics, isocyanates, Based resin, a polyvinyl alcohol-based polymer, a gelatin-based polymer, a vinyl-based polymer, a latex-based polymer, a polyester-based polymer and a water-based polyester polymer. By way of non-limiting example, it may be a UV curable adhesive composition containing oligomers and monomers in a weight ratio of about 20-80%: 80-20%.

As the oligomer, one or more oligomers selected from urethane, epoxy acrylate, and polyester series may be applied. Examples of the monomer include DPHA (Dipentaerythritol Hexaacrylate), DPPA (Dipentaerythritol Pentaacrylate), TMPTA (trimethylolpropane triacrylate), TMPTMA (Trimethylol propane triacrylate), HDDA (Hexanedioldiacrylate), DPGDA 2-Hydroxyethyl acrylate (2-HEA), 2-Hydroxyethyl Methacrylate (2-HEMA), and 2-Hydroxyethyl acrylate (TPE) ≪ / RTI > may be applied. More specifically, as a non-limiting example of this, DPAH (5-30%), DPPA (5-30%), TMTPA (3-20), PEA (10-50%), IBOA %), 2-HEMA (1 to 10), 2-HEA (1 to 10%), and other monomers (1 to 30%).

The first primer layer may be formed thinner than the other layers, and the thickness of the first primer layer may be adjusted to improve the light transmittance and reduce the reflectance. The thickness of the first primer layer may be 1 占 퐉 to 10 占 퐉. If the thickness of the first primer layer is less than 1 mu m, adhesion between the reflective polarizer film and the reliability supporting layer may be insufficient. If the thickness of the first primer layer exceeds 10 mu m, Lt; / RTI >

Next, the multifunctional layer 600 formed on the lower surface of the reliability supporting layer 300 in the composite reflective polarizing film will be described.

18 is a perspective view of a multi-functional layer included in a preferred embodiment of the present invention. The multi-functional layer 600 includes a prism pattern formed on one side of the light guide layer 620 and the light guide layer 620 And a fine pattern layer 610 including the prism pattern may be formed on the lower surface of a reliable support layer (not shown) or a second support layer (not shown) that can be interposed between the reliable support layer and the multi- And may be coupled to face the lower surface of the primer layer (not shown).

First, the light guide layer 620 of the multi-function layer 600 will be described.

The light guide layer 620 serves to guide the light emitted from the light source and to support the fine pattern layer 610 included in the multi-function layer 600. In addition, the light guide layer 620 plays a role of the above- Thereby further improving the reliability of the composite reflective polarizing film. In general, in order to improve the focusing function of light among the optical films included in the backlight unit, it is necessary to include a fine pattern layer to be described later. In this case, the fine pattern layer generally has a separate support layer for supporting the fine pattern layer. However, the multi-functional layer included in the present invention can support the fine pattern layer through the light-guiding layer without a separate supporting layer for supporting the fine pattern layer. Therefore, since the supporting layer is not provided, And at the same time, it can be more advantageous in reducing the thickness of the optical film included in the backlight unit. Further, when a heat-resistant material is used as the light-guiding layer, the light-guiding layer can partially perform the role of a reliable supporting layer in terms of reliability, thereby reducing the thickness of the reliable supporting layer. It can be thinned, which is highly desirable.

The material of the light guide layer 620 can be used without limitation as a material of the light guide layer commonly used in the art. For example, a polycarbonate series, a polysulfone series, a polyacrylate a polyvinyl alcohol series, a polyvinyl alcohol series, a poly norbornene series, and a polyester ester series material may be used in the present invention. The term " polyvinyl alcohol series, polyvinyl alcohol series, polyacrylate series, polystyrene series, polyvinyl chloride series, One or two or more of them may be included.

However, in the case of polysulfone or polyacrylic type films among the above materials, it is not preferable for improving the reliability of the composite reflective polarizing film because the optical properties are excellent but the heat resistance is poor, and the material is very hard and easily broken. The composite reflective polarizing film can not be combined with each other through a continuous manufacturing process and the layers are stacked on the separately cut light guide layer, so that the production process is complicated and the productivity is low.

Thus, according to a preferred embodiment of the present invention, in consideration of the remarkably excellent supporting ability for the fine pattern layer, the product unit price, the heat resistance, the light transmittance, and the flexibility to wind the optical film on the roller at the top of the manufacturing process, Series. ≪ / RTI > Accordingly, it is possible to composite other layers continuously without cutting the light guide layer one by one, and the film can be wound on the rollers in the process of compounding, which is advantageous in that the productivity is greatly increased.

The thickness of the light guide layer 620 may be designed differently depending on the desired properties such as the minimum thickness necessary for maintaining 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, In order to exhibit a remarkable synergistic effect with respect to the reliability supporting layer in terms of light transmittance to be achieved through the multi-functional layer, support of the fine pattern layer, and reliability of the composite reflective polarizing film, a thickness of 400 to 1000 mu m And more preferably 600 to 900 占 퐉. If the thickness of the light guide layer is less than 400 mu m, the function of guiding the light of the light guide layer may be deteriorated. If the thickness of the light guide layer is more than 1000 mu m, the brightness may be significantly lowered, and the thickness of the light guide layer may become too thick for thinning the composite reflective polarizing film. Or the display panel including such a unit is becoming slimmer, there is a problem that its use may be limited. Also, considering the reliability of the composite reflective polarizing film, it is preferable that the total thickness of the reliability supporting layer and the light guiding layer has a constant thickness range. The increase in the thickness of the light guiding layer leads to a decrease in the thickness of the reliable supporting layer, The support layer can not prevent the occurrence of fine lines or bends in the reflective polarizing film, which may be highly undesirable in terms of reliability of the composite reflective polarizing film.

In order to further improve the reliability of the composite reflective polarizing film, the thickness of each of the reflective polarizing film, the reliability supporting layer, and the light guiding layer may satisfy the following equation (1): 2.2 to 6.5.

[Equation 1]

5, a composite reflective polarizing film according to an exemplary embodiment of the present invention includes a reflective polarizing film 200 and a reliability supporting layer 300 for maintaining the reliability of the reflective polarizing film. Function layer 600 for enhancing light guiding and condensing. When the thickness of the reliability supporting layer 300, which is provided for securing high reliability, is increased, the appearance change of the fine lines and the curvature is reduced, And the like may be deteriorated.

Thus, the light guide layer 620 of the multi-function layer 600 divides and shares the supporting function of the reliability supporting layer provided to maintain the reliability of the composite reflective polarizing film, so that the reliability of the composite reflecting polarizing film And it is possible to minimize the deterioration of optical properties such as brightness which may be caused by the provision of the support layer and to reduce the thickness of the composite reflective polarizing film. Thus, the desired properties of the present invention can be very advantageously realized.

If the value of Equation (1) according to the present invention is less than 2.2, it may be difficult to prevent appearance changes such as wrinkles and curvature of the reflective polarizing film at high temperature, and thus the reliability is very low and / The light guiding function of the light guiding layer may not be performed, and the supporting function for the light guiding layer formed on the light guiding layer may be weakened, so that the optical properties such as the luminance increase due to the light guiding layer may not be improved to a desired level. When the value of the formula (1) exceeds 6.5, the optical properties such as brightness are remarkably deteriorated and desired physical properties may not be obtained, which is not preferable for thinning the composite reflective polarizing film.

Meanwhile, in the composite reflective polarizing film according to one preferred embodiment of the present invention, the value of Equation 1 according to the present invention may satisfy 2.5 to 5.8, and more preferably the value of Equation 1 may be 3.5 to 5.5 . Thus, the reliability of the composite reflective polarizing film can be remarkably improved, and at the same time, the composite reflective polarizing film can be very suitable for satisfying all of the desired physical properties such as thinness and excellent optical properties such as brightness.

Although the total thickness of the light-emitting layer 620 of the multi-functional layer 600 and the reliability supporting layer 300 may satisfy the value of Equation 1 according to the present invention, when the thickness of any one of the two layers is relatively thick There may be a problem that the function of the relatively thin layer is not properly developed, and there may be a problem that the physical properties such as luminance may be lowered due to the relatively thick layer. Accordingly, the composite reflective polarizing film according to one preferred embodiment of the present invention can satisfy the following formula (2): 0.06 - 0.55, more preferably 0.1 - 0.5.

&Quot; (2) "

If the value of Equation (2) is less than 0.06, the thickness of the reliability supporting layer is too thin, so that the reflection polarizing film may not be prevented from being wrinkled or bent even if the light guide layer is thick. If it exceeds 0.55, The light guiding function may be deteriorated or the thickness of the light guiding layer may perform the light guiding function. However, since the thickness of the reliability supporting layer is increased, the brightness may be decreased.

Next, the fine pattern layer 610 formed on one side of the light guide layer 620 will be described.

The fine pattern layer is for enhancing the light collecting function of focusing the light guided by the light guide plate after being emitted from the light source. The fine pattern layer may include any fine pattern capable of condensing light, , A micro lens, a triangular pyramid, and a pyramid pattern, and more preferably, a prism pattern.

18 is a perspective view of a multi-functional layer according to a preferred embodiment of the present invention, and shows a plurality of prisms 611 and 612 patterns 610 formed on the light guide layer 620. As shown in FIG.

Each prism 611 includes a prism surface inclined to both sides with respect to the upper crest 611a. The apex angle of the prisms 611 and 612 may preferably be in the range of 45 DEG to 135 DEG, more preferably in the range of 60 DEG to 130 DEG, and still more preferably in the range of 85 DEG to 105 DEG. The pitch of the prism 611 may be about 20 to 100 占 퐉, and the height may be about 10 to 60 占 퐉.

The prism 611 may be continuously formed from one side of the light guide layer 620 to the other side, but is not limited thereto. Further, the neighboring prisms 611 and 612 may be adjacent to each other, but may be partially separated. Here, the adjacency of the prisms 611 and 612 means that 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 light guide layer 620. The first direction X1 that is the extending direction of the prisms 611 and 612 may be parallel to the long side or the short side of the light guide layer 620 when the light guide layer 620 is rectangular in plan view. In some other embodiments, the first direction X1 may be an acute angle with respect to the long side and / or the short side of the light guide layer 620, respectively. For example, the crossing angle may be in the range of ± 5 to ± 30 degrees.

The material of the fine pattern layer including the above-described prism pattern may be a known material, may be selected depending on the shape of the selected pattern, and may be a material which does not limit the physical properties realized according to the shape of the desired pattern , It can be used without limitation. As a preferable example, the fine pattern layer may be formed by curing a polymer resin including at least one of a photocurable polymer resin and a thermosetting polymer resin. As a preferable example of the polymer resin, a polymer resin including a thermosetting or photocurable acrylic resin may be used. However, the kind of the polymer resin used may be changed depending on the shape of the fine pattern specifically included in the light diffusion layer. For example, the prism pattern may include an unsaturated fatty acid ester, an aromatic vinyl compound, an unsaturated fatty acid and a derivative thereof, and a vinyl cyanide compound such as methacryl nitrile. Specific examples thereof include uretanic acrylate, methacrylic acryl Late resin and the like can be used.

In addition, according to a preferred embodiment of the present invention, a second primer layer may be further provided between the reliability supporting layer and the multi-functional layer.

The second primer layer may be formed by curing at least one of a photopolymerizable resin and a thermosetting polymer resin. As a specific type of such a polymer resin, any polymer resin capable of minimizing the luminance reduction due to the primer layer can be used without limitation, and examples of the material include silicone polymers, urethane polymers, SU-polymers having a silicone-urethane hybrid structure, acrylics, isocyanates, Based resin, a polyvinyl alcohol-based polymer, a gelatin-based polymer, a vinyl-based polymer, a latex-based polymer, a polyester-based polymer and a water-based polyester polymer. By way of non-limiting example, it may be a UV curable adhesive composition containing oligomers and monomers in a weight ratio of about 20-80%: 80-20%.

As the oligomer, one or more oligomers selected from urethane, epoxy acrylate, and polyester series may be applied. Examples of the monomer include DPHA (Dipentaerythritol Hexaacrylate), DPPA (Dipentaerythritol Pentaacrylate), TMPTA (trimethylolpropane triacrylate), TMPTMA (Trimethylol propane triacrylate), HDDA (Hexanedioldiacrylate), DPGDA 2-Hydroxyethyl acrylate (2-HEA), 2-Hydroxyethyl Methacrylate (2-HEMA), and 2-Hydroxyethyl acrylate (TPE) ≪ / RTI > may be applied. More specifically, as a non-limiting example of this, DPAH (5-30%), DPPA (5-30%), TMTPA (3-20), PEA (10-50%), IBOA %), 2-HEMA (1 to 10), 2-HEA (1 to 10%), and other monomers (1 to 30%).

The second primer layer can be formed thinner than the other layers, and the thickness of the second primer layer can be adjusted to improve the light transmittance and reduce the reflectance. The thickness of the second primer layer may be 3 탆 to 10 탆. If the thickness of the second primer layer is less than 3 mu m, adhesion between the reliability supporting layer and the multi-functional layer may be insufficient. If the thickness of the second primer layer exceeds 10 mu m, Lt; / RTI >

On the other hand, when the fine pattern layer is formed of the material used for the second primer layer, the desired adhesion can be improved without interposing the second primer layer between the reliability supporting layer and the multi-functional layer, It is possible to prevent the luminance from being reduced and to further reduce the thickness of the composite reflecting piece and the film.

As described above, the composite reflective polarizing film according to one preferred embodiment of the present invention has a haze value of 73% or more, preferably 85% or more, and more preferably 90% or more.

By satisfying the haze value, it is possible to prevent the appearance of various foreign substances, bubbles, etc., which may be contained in the film in the manufacturing process, thereby improving the appearance quality. If the above range is not satisfied, there is a problem that the quality of the outer appearance is deteriorated and a separate device or another separate structure must be added in order to prevent visible foreign substances. And there is a problem that the manufacturing time and manufacturing cost are increased due to the added structure.

According to another embodiment of the present invention, there is provided a composite reflective polarizing film comprising a reflective polarizing film in which a polymer is dispersed in a substrate, the composite reflective polarizing film comprising: a reliable supporting layer formed on an upper surface of a reflective polarizing film; And a light diffusion layer formed on an upper surface of the reliability supporting layer; And a multi-functional layer formed on the lower surface of the reflective polarizing film.

The composite reflective polarizing film in which the stacking order of each layer is different from that of the composite reflective polarizing film according to one embodiment described above can be slightly reduced in optical characteristics such as luminance as compared with the composite reflective polarizing film according to the above- However, there is an advantage that excellent reliability of a similar level can be expressed and defects of the surface appearance can be prevented.

In addition, the light diffusing layer, the reflective polarizing film, the reliability supporting layer and the multi-functional layer can be laminated in a sequence different from the above-described other embodiments. In this case, the reliability of the desired composite reflective polarizing film may not be a problem, The characteristics can be degraded.

Next, a method for producing a composite reflective polarizing film according to a preferred embodiment of the present invention will be described. However, the manufacturing method described below is a preferred embodiment, and the present invention is not limited thereto.

Specifically, a composite reflective polarizing film according to one preferred embodiment of the present invention includes (1) forming a light diffusion layer on a top surface of a reflective polarizing film; (2) bonding the upper surface of the reliable supporting layer to the lower surface of the reflective polarizing film; And (3) forming a multi-functional layer on a lower surface of the reliability supporting layer; , And the steps (1) to (3) may be carried out in any order.

First, in step (1), a step of forming a light diffusion layer on the upper surface of the reflective polarizing film will be described.

According to a preferred embodiment of the present invention, the reflective polarizing film includes: (a) a base material and a plurality of dispersing materials contained in the base material, the plurality of dispersing materials for transmitting the first polarized light radiated from the outside and reflecting the second polarized light Wherein at least 80% of the plurality of dispersions contained in the base material have different refractive indexes in at least one axial direction from the base material, and the ratio of the short axis length to the major axis length Of the first group among the groups is 0.2 to 2.0 占 퐉 ² , and the second group of the second group of the second group contains 0.2 to 2.0 占 퐉 ² , and the second Group has a dispersoid cross-sectional area of more than 2.0 mu m ² to 5.0 mu m < ² > or less, a third group of dispersoids has a cross-sectional area of more than 5.0 mu m ² to 10.0 mu m ² or less, ; . ≪ / RTI >

According to a preferred embodiment of the present invention, there is provided a method for manufacturing a polarizing plate, comprising the steps of: (a) forming an integrated skin layer on at least one surface of the core layer using the reflective polarizing film produced through the step (a) ; ≪ / RTI > a reflective polarizing film can be produced.

The description of the core layer and the skin layer is the same as that described above, and will be described focusing on the manufacturing process. The process of performing both of the above (a) and (b) will be described, but the present invention is not limited thereto.

The steps (a) and (b) may be performed through any process which will be described later but not intermittently.

Specifically, first, the base component, the dispersion component and the skin layer component are supplied to the extruding portion. The base component can be used without limitation as long as it is used in a reflective polarizing film in which a conventional dispersion is dispersed. Preferably, the base component is polyethylene naphthalate (PEN), co-polyethylene naphthalate (co-PEN), polyethylene terephthalate (PET) (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PS), polyethylene terephthalate (PE), acrylonitrile butadiene styrene (ABS), polyurethane (PU), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile blend (SAN), ethylene vinyl acetate It is possible to use amide (PA), polyacetal (POM), phenol, epoxy (EP), urea (UF), melanin (MF), unsaturated polyester (UP) It can be a PEN.

The dispersion component can be used without limitation as long as it is usually used in a reflective polarizing film in which a dispersion is dispersed. Preferably, the component is polyethylene naphthalate (PEN), co-polyethylene naphthalate (co-PEN), polyethylene terephthalate (PET) (PS), polymethylmethacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polypropylene (PP) (PE), acrylonitrile butadiene styrene (ABS), polyurethane (PU), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile blend (SAN), ethylene vinyl acetate (EVA) (PA), polyacetal (POM), phenol, epoxy (EP), urea (UF), melanin (MF), unsaturated polyester (UP), silicone (SI) and cycloolefin polymers, Can be used and more desirable It may be a dimethyl 2,6-naphthalenedicarboxylate, dimethyl terephthalate and ethylene glycol, Im chroman-hexane dimethanol (CHDM), such as the monomers are suitably polymerized co-PEN.

The skin layer component may be a conventionally used component, but is not particularly limited as long as it is used in a reflective polarizing film, and preferably polyethylene naphthalate (PEN), co-polyethylene naphthalate (co-PEN) (PS), polymethylmethacrylate (PMMA), polybutylene terephthalate (PBT), polybutylene terephthalate (PBT), and polyethylene terephthalate (PET), polycarbonate Polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene (ABS), polyurethane (PU), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile blend (EVA), polyamide (PA), polyacetal (POM), phenol, epoxy (EP), urea (UF), melanin (MF), unsaturated polyester (UP) Polymers may be used singly or in combination. Monomers such as dimethyl-2,6-naphthalene dicarboxylate, dimethyl terephthalate and ethylene glycol, cyclohexanedimethanol (CHDM), etc. may be suitably polymerized co-PEN.

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

The viscosity of the base component is designed to be different from that of the dispersion component so that there is a difference in polymer flow so that the dispersion component can be arranged inside the base component. The following base component and the dispersion component pass through the mixing zone and the mesh filter zone, and the dispersion component is randomly arranged in the base material with a difference in viscosity.

Then, at least one surface of the core layer is joined with the skin layer component transferred from the extrusion portion. Preferably, the skin layer component may be laminated on both sides of the core layer. When the skin layers are laminated on both sides, the material and the thickness of the skin layer may be the same or different from each other.

Next, the dispersion control unit induces spreading in the flow control unit so that the dispersion component contained in the substrate can be randomly arranged. Specifically, Figure 19 is a cross-sectional view of a coat-hanger die, which is a type of preferred flow control that may be applied to the present invention, and Figure 20 is a side view of Figure 19. The size and arrangement of the cross-sectional areas of the dispersion components can be controlled at random by appropriately adjusting the extent of spreading of the substrate. In FIG. 18, since the substrate on which the skin layer transferred through the flow path is spread spreads widely from side to side in the coat-hanger die, the dispersion component contained therein also spreads to the left and right.

According to a preferred embodiment of the present invention, there is provided a method of manufacturing a liquid crystal display device, comprising the steps of: cooling and smoothing a reflection polarized film transferred from a flow control unit; And a step of thermally fixing the stretched reflective polarizing film.

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

Thereafter, a process of stretching the reflective polarizing film through the smoothing step is performed.

The stretching may be performed through a conventional stretching process of a reflective polarizing film, thereby causing a refractive index difference between a base component and a dispersing component to cause light modulation at the interface, and the spreading induced first component Dispersion component) is further reduced in aspect ratio through stretching. For this purpose, the uniaxial stretching or biaxial stretching can be preferably performed in the stretching step, and more preferably uniaxial stretching can be performed. In the case of uniaxial stretching, stretching may be performed in the longitudinal direction of the first component. The stretching ratio may be 3 to 12 times. On the other hand, a method of changing an isotropic material to birefringent is commonly known. For example, in the case of stretching under an appropriate temperature condition, the dispersion molecules may be oriented so that the material becomes birefringent.

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

Next, a step of forming a light diffusion layer on the upper surface of the produced reflective polarizing film is performed.

At this time, an adhesive layer may be further formed on the upper surface of the reflective polarizing film to facilitate the formation of the light diffusion layer. As a result, the adhesive strength, appearance, and electrooptic characteristics of the light diffusion layer can be improved. Examples of the material include, but are not limited to, acrylic, ester, and urethane. The adhesive layer can be formed thinner than other layers, and the thickness of the primer layer can be adjusted to improve the light transmittance and reduce the reflectance. The thickness of the adhesive layer may be from 5 nm to 300 nm. If the thickness of the adhesive layer is less than 5 nm, the adhesion between the reflective polarizing film and the light diffusion layer may be insignificant. If the thickness of the adhesive layer exceeds 300 nm, unevenness or molecular aggregation may occur during the adhesive layer treatment.

 According to a preferred embodiment of the present invention, the light diffusion layer may form a fine pattern on at least one surface or form a bead coating layer, thereby maximizing the light collecting effect and preventing irregular reflection on the surface, thereby remarkably improving the brightness. The fine pattern may be at least one pattern selected from the group consisting of a prism, a lenticular, a micro lens, a triangular pyramid, and a pyramid pattern, and each of these patterns may be formed by forming a pattern alone or in combination. Also, even when a pattern is formed alone, the pattern may be constant, or the height, the pitch, and the like may be differently arranged. The bead coating layer may be a coating layer in which the beads are contained in the resin layer, a part of the beads is embedded in the upper part of the resin layer, beads are attached to the upper surface of the resin layer and / Beads may be directly formed.

The material of the light diffusion layer is preferably a polymer resin including a thermosetting or photo-curable acrylic resin. For example, the prism pattern can be an unsaturated fatty acid ester, an aromatic vinyl compound, an unsaturated fatty acid and a derivative thereof, or a vinyl cyanide compound such as methacryl nitrile. Specific examples thereof include uretanic acrylate, methacrylic acryl Late resin and the like can be used.

The light diffusion layer may be made of a material having a higher refractive index than the reflective polarizing film.

A specific method of forming the light diffusion layer including the fine pattern as described above on the upper surface of the reflective polarizing film is not particularly limited in the present invention, but preferably, the reverse pattern of the fine pattern is formed on the master roll or the fine pattern Can be formed on the reflective polarizing film through the mold film for forming a pattern.

According to a preferred embodiment of the present invention, in a method using a master roll in which a reverse pattern of the fine pattern is formed, 1-i) prisms, a lenticular, a microlens, a triangular pyramid, a bead and a pyramid pattern Applying a reflective polarizing film to a master roll formed on an outer surface in a reversed phase pattern with respect to at least one selected fine pattern and applying the molten polymer resin to the pattern surface of the master roll or the reflective polarizing film; And 1-ii) curing the polymer resin by applying at least one of light and heat while the polymer resin is press-formed on the pattern surface of the master roll, and separating the polymer resin.

The method may further include the step of secondarily curing the polymer resin by irradiating UV or heat again after the step 1-ii).

21 is a schematic view of a process of forming a fine pattern according to a preferred embodiment of the present invention, and FIG. 22 is a cross-sectional view showing a detailed structure of the forming unit of FIG. In FIG. 22, the reflection type polarizing film 770 is released from the star trolley 755, passes through the guide roll 754, and passes through the infrared lamp 751. In this process, the reflection type polarizing film 770 is surface-modified by the infrared rays of the infrared lamp to improve the adhesion with the light diffusion layer 771. The reflective polarizing film 770 leaving the star trolley 755 is guided to the master roll 705 via the pattern guide roll 764 so that the patterned surface of the master roll 705 from the injection portion 742, The polymer as the material of the reflective polarizing film 770 is applied and combined with the reflective polarizing film 770. In this process, the resin is a resin melted at room temperature and can be primary-cured due to the primary UV light emitted from the primary UV curing unit 752 provided under the master roll 705. At this time, the temperature around the curing unit 752 is 20 to 30 ° C, and the temperature of the heat generated when the resin is cured is 40 to 80 ° C, and the glass transition temperature of the resin (Tg: Temperature that represents a changed characteristic, such as soft rubber, before undergoing a phase change). The light diffusing layer 771, which has completely transferred the pattern of the master roll surface in the glass transition state, passes through the pattern guide roll 764 again and is reflected by the reflective polarizing film 770 and the light diffusing layer 771, (772), passed through a guide roll (754) and wound on a finish roll (756).

As shown in FIG. 20, the end face of the reflective polarizing film 772 formed with the turn formed by irradiating UV light twice is a face contrary to the end face of the master roll 705. For example, If the surface is an engraved surface, the reflective polarizing film 772 on which the turn is formed becomes an embossed surface of the embossed surface.

Next, in the case of a method using a mold film for pattern formation in which an inverse pattern of a fine pattern is formed, a film having transparency, flexibility, predetermined tensile strength and durability can be used as the material of the mold film for pattern formation, It is preferable to use a film.

In this case, according to a preferred embodiment of the present invention, the step (1) may include: 1-1) a step of repeating the steps of: 1-1) forming at least one fine pattern selected from the group consisting of reflective polarizing film and prism, lenticular, microlens, triangular pyramid, bead, Transferring a mold-forming mold film formed on one surface of a pattern which is in a reverse phase to that of the pattern-forming mold film; 1-2) bringing the upper surface of the reflective polarizing film and the pattern-forming mold film into contact with one surface of the patterned surface; 1-3) filling a void space between two films formed by the pattern by injecting a fluid material between the adhered reflective polarizing film and the mold film for pattern formation; 1-4) curing the filled material and separating the mold film for pattern formation.

Preferably, the step of filling the material between the two reflective films formed by the pattern by uniformly applying pressure between the reflective polarizing film and the mold film for pattern formation between steps 1-3) and 1-4) .

Preferably, the step 1-4) may include the step of applying at least one of heat and light to the material filled in the void space between the two films formed by the pattern.

23 is a schematic view of a process of forming a fine pattern according to another preferred embodiment of the present invention.

First, the reflective polarizing film 810 wound on the first roll 820 is conveyed by guide rollers 830a through 830c. At this time, the shaping mold 842 of the pattern molding unit 840 is also conveyed / rotated while being wound around the master roll 844 and the pattern guide rolls 846a and 846b. At this time, since the master roll 844 is engaged with the guide rolls 830c and 830d, the reflective polarizing film 810 is attracted by the guide roll 830c to be engaged with the molding mold 842. [ Here, the guide roll 830c performs a gap adjusting function to adjust the thickness of the pattern of the coating liquid applied to the reflective polarizing film 810, that is, the angle of the light diffusing layer of which the light diffusion layer is made of resin. More specifically, when the guide roll 830c is in close contact with the master roll 844, the pattern of the light diffusion layer can be made thinner. On the contrary, when the guide roll 830c is further separated from the master roll, It can be formed thick. The pattern thickness of the light diffusion layer can be adjusted by the viscosity of the coating liquid, the patterning speed, and the tension of the reflective polarizing film in addition to the interval between the guide roll 830c and the master roll 844.

The coating liquid is injected into the reflective polarizing film 810 at a position where the guide roll 830c and the master roll 844 are engaged with each other by the coating liquid injecting means 860 and is pushed into the patterns of the molding die 842, Is uniformly distributed and pattern-formed by the pressure between the guide roll 830c and the master roll 844. [ The coating liquid distributed between the patterns is cured by heat and / or UV emitted from the curing means 870. The patterned coating liquid is cured and applied to the reflective polarizing film. The cured and applied reflective polarizing film is separated from the molding die 842 while being guided by the guide roll 830d. The patterned reflective polarizing film 812 is transferred by the guide roll 830e, 2 roll 850. As shown in Fig. Here, the guide roll 830d performs a peeling function to separate the reflective polarizing film 812 on which the coating solution is applied, that is, the light diffusion layer, from the molding die 842. [

The reflective polarizing film 810 and the reflective polarizing film 812 having the light-diffusing layer formed on one surface thereof are connected to each other and are classified for ease of explanation. That is, the reflective polarizing film 810 refers to a state before the light diffusion layer is formed, and the reflective polarizing film 812 having the light diffusion layer formed thereon passes through the pattern molding portion 840, It means that it is applied and finished. In Fig. 23, only a part of the pattern layer formed on the reflective polarizing film 812 on which the light-diffusing layer is formed is shown. In reality, the light-diffusing layer is also formed on the reflective polarizing film wound on the second roll 850.

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

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

The shaping mold 942 is conveyed by the master roll 946 and the guide rolls 947a to 947d while being wound on the third roll 944 in contrast to the embodiment of Figure 23 and is fed to the reflective polarizing film 910 After the pattern of the coating liquid is formed, it is wound on the fourth roll 948. At this time, it is preferable that the forming mold 942 is formed to have the same length as the reflective polarizing film 910, and a pattern defect due to the seam or a discontinuity in the pattern is caused in the reflective polarizing film 912 in which the light- The pattern is uniformly formed over the entire region without the formation of the pattern. In FIG. 24, only a part of the pattern embodying the pattern is shown in the forming mold, but in actual practice, the pattern is implemented throughout the forming mold.

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

On the other hand, the method of forming the bead coating layer on the reflective polarizing film is not particularly limited, but the bead coating layer forming composition may be coated on the reflective polarizing film by a conventional method. Preferably, 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. At this time, the bead coating layer may be formed so that the bead is contained in the resin layer by adjusting the bead diameter included in the composition and the thickness according to the amount of the applied composition, or the bead coating layer may be formed with only a part of the bead embedded therein. The coated composition may be cured through light and / or heat depending on the kind of resin contained, depending on the usual conditions, and the light may preferably be UV.

Next, in step (2) according to a preferred embodiment of the present invention, a step of forming a reliable supporting layer on the lower surface of the reflective polarizing film is performed.

According to a preferred embodiment of the present invention, the step (2) comprises the steps of: 2-1) forming a first primer layer on the upper surface of the reliability supporting layer to enhance adhesion between the reflective polarizing film and the reliability supporting layer; And 2-2) bonding the first primer layer and the lower surface of the reflective polarizing film so as to be in contact with each other.

According to a preferred embodiment of the present invention, in the step 2-1), the reflective polarizing film may be stretched in at least one axial direction, and the reliability supporting layer may be a uniaxially stretched polyethylene terephthalate film.

The first primer layer may form at least one polymer resin of a photocurable polymer resin or a thermosetting polymer resin on the lower surface of the reflective polarizing film or on the upper surface of the reliable support layer, . As a specific type of such a polymer resin, any polymer resin capable of minimizing the luminance reduction due to the primer layer can be used without limitation, and examples of the material include silicone polymers, urethane polymers, SU-polymers having a silicone-urethane hybrid structure, acrylics, isocyanates, Based resin, a polyvinyl alcohol-based polymer, a gelatin-based polymer, a vinyl-based polymer, a latex-based polymer, a polyester-based polymer and a water-based polyester polymer. Such a polymer resin can be formed by coating the upper surface of the reliability supporting layer by a conventional method.

Examples of the material and thickness of the first primer layer are the same as those described above.

Next, in step 2-2), a step of joining the lower surface of the reflective polarizing film to the formed first primer layer is performed. At this time, the first primer layer may be cured after being laminated to the reflective polarizing film in a semi-cured state and cured or coated in the state of being laminated to the reflective polarizing film. The curing can be determined according to the kind of the polymer resin used as the first primer layer, and can be preferably cured through heat and / or light, and a specific method of performing the curing is a known method And is not particularly limited in the present invention.

Next, in step (3) according to a preferred embodiment of the present invention, a step of forming a multi-functional layer on the lower surface of the reliability supporting layer, wherein the multi-functional layer comprises a light guide layer and a fine pattern layer The fine pattern portion may include a prism pattern. In this case, the prism pattern may have a constant pattern, a different height, a different pitch, or the like.

The detailed description of the material of the light guide layer and the fine pattern layer is the same as that described above, so that the description thereof will be omitted and a method of forming a fine pattern layer on the light guide layer will be mainly described.

A specific method of forming the fine pattern layer on the upper surface of the light guide layer is not particularly limited in the present invention, but it is preferable to use a master roll having a reverse pattern of the fine pattern or a pattern forming Can be formed on the light guide layer through the mold film.

In the following description of the process, the fine pattern included in the fine pattern layer will be described mainly on the prism pattern.

According to a preferred embodiment of the present invention, a light guide layer is closely adhered to a master roll formed in a reverse surface to a prism pattern on an outer surface of the master roll, Applying a molten polymer resin to the pattern surface of the master roll or the light guide layer; And curing the polymer resin by applying at least one of light and heat while the polymer resin is press-formed on the pattern surface of the master roll, and separating the polymer resin.

More specifically, FIG. 25 is a schematic view of a process of forming a fine pattern of a multi-functional layer according to a preferred embodiment of the present invention. In FIG. 25, the light guide layer 1070 passes through a guide roll 1054 while being unrolled from a star trolley 1055 And passes through an infrared lamp 1051. In this process, the light guide layer 1070 is surface-modified by the infrared rays of the infrared lamp, and the adhesion with the prism pattern portion 1071 is improved. The light guide layer 1070 leaving the star trolley 755 enters the master roll 1005 through the pattern guide roll 1064 so that the pattern surface of the master roll 705 from the injection portion 1042, A polymer serving as a material for the light guide layer 1071 is applied and merged with the light guide layer 1070. In this process, the resin is a resin melted at room temperature and can be primary-cured by the primary UV light emitted from the primary UV curing apparatus 1052 provided under the master roll 1005. At this time, the temperature around the curing device 1052 is 20 to 30 ° C, and the temperature of heat generated when the resin is cured is 40 to 80 ° C, and the glass transition temperature of the resin (Tg: Temperature that represents a changed characteristic, such as soft rubber, before undergoing a phase change). The prism fine pattern layer 1071, which has completely transferred the pattern shape of the surface of the master roll in the glass transition state, passes through the pattern guide roll 1064 again, while the light guide layer 1070 and the prism fine pattern layer 1071 are combined Functional layer 1072, passes through the guide roll 1054, and is wound on the finish roll 1056. The multi-

As shown in FIG. 25, the cross section of the multifunctional layer 1072 formed by turning the UV light two times is a surface contrary to the cross section of the master roll 1005. For example, If it is an engraved surface, the multifunctional layer 1072 on which the turn is formed becomes an embossed surface of the emboss.

Next, in the case of a method using a mold film for pattern formation in which an inverse pattern of a fine pattern is formed, a film having transparency, flexibility, predetermined tensile strength and durability can be used as the material of the mold film for pattern formation, It is preferable to use a film.

In this case, according to a preferred embodiment of the present invention, the multifunctional layer comprises the steps of: 3-1) transferring a mold film for pattern formation formed on one surface of a pattern having a reversed phase to the light guide layer and the prism pattern; 3-2) Contacting the upper surface of the light guide layer and one surface of the pattern-forming mold film with the pattern formed thereon; 3-3) filling a void space between two substrates formed by the pattern by injecting a fluid material between the contact light-guiding layer and the mold film for pattern formation; And 3-4) curing the filled material and separating the mold film for pattern formation.

Preferably, the method further comprises the step of applying pressure to the closely-packed light guide layer and the pattern-forming mold film to uniformly fill the material in the void space between the two films formed by the pattern.

Further, preferably, the curing can be performed by applying at least one of heat and light to a material filled in a void space between two films formed by the pattern.

26 is a schematic view of a process of forming a fine pattern of a multi-functional layer according to another preferred embodiment of the present invention.

First, the light guide layer 1110 wound on the first roll 1120 is conveyed by the guide rolls 1130a to 1130c. At this time, the shaping mold 1142 of the pattern molding unit 1140 is also conveyed / rotated while being wound around the master roll 1144 and the pattern guide rolls 1146a and 1146b. At this time, since the master roll 1144 is engaged with the guide rolls 1130c and 1130d, the light guide layer 1110 is attracted to the guide roll 1130c and engaged with the forming mold 1142. [ Here, the guide roll 1130c performs a gap adjustment function to adjust the thickness of the pattern of the coating liquid applied to the light guide layer 1110, that is, the prism pattern portion which is a prism pattern portion made of resin. More specifically, when the guide roll 1130c is in close contact with the master roll 1144, the pattern of the prism pattern portion can be made thinner. On the contrary, when the guide roll 1130c is further separated from the master roll, It can be formed thick. The pattern thickness of the prism pattern portion can be adjusted by the viscosity of the coating liquid, the patterning speed, and the tension of the reflective polarizing film in addition to the interval between the guide roll 1130c and the master roll 1144.

The coating liquid is injected into the light guide layer 1110 at the point where the guide roll 1130c and the master roll 1144 are engaged with each other by the coating liquid injecting means 1160 and is pushed into between the patterns of the molding die 1142, Is uniformly distributed and pattern-formed by the pressure between the roll 1130c and the master roll 1144. The coating liquid distributed between the patterns is cured by heat and / or UV emitted from the curing means 1170. The multi-functional layer 1112, on which the prismatic pattern portion is formed on the light guide layer 1110, is separated from the molding die 1142 by being guided by the guide roll 1130d while being guided by the guide roll 1130d, And is wound on the second roll 1150. Here, the guide roll 1130d performs a peeling function for separating the light guide layer 1110 to which the coating liquid is applied, that is, the prism pattern portion, from the molding die 1042. [

The light guide layer 1110 and the light guide layer 1110 formed on one side of the prism pattern portion are connected to each other and are classified for ease of explanation. In other words, the light guide layer 1110 refers to a state before the prism pattern portion is formed, and the semi-light guide layer 1110 having the prism pattern portion passes through the pattern molding portion 1040, And is completed. In FIG. 26, only a part of the pattern formed on the light guide layer 1110 having the prism pattern portion is shown. In reality, the prism pattern portion is also formed on the light guide layer wrapped around the second roll 1150.

Step (3) according to a preferred embodiment of the present invention comprises laminating the multi-functional layer manufactured as described above to the lower surface of the reliability supporting layer, specifically c-1) strengthening the adhesion of the multi- Forming a second primer layer on a lower surface of the reliable support layer for the first support layer; And c-2) bonding the first primer layer and one side of the multi-functional layer to each other.

In the step c-1), the second primer layer may form at least one polymer resin of the photocurable polymer resin or the thermosetting polymer resin on the lower surface of the reliability supporting layer. As a specific type of such a polymer resin, any polymer resin capable of minimizing the luminance reduction due to the primer layer can be used without limitation, and examples of the material include silicone polymers, urethane polymers, SU-polymers having a silicone-urethane hybrid structure, acrylics, isocyanates, Based resin, a polyvinyl alcohol-based polymer, a gelatin-based polymer, a vinyl-based polymer, a latex-based polymer, a polyester-based polymer and a water-based polyester polymer. Such a polymer resin can be formed by coating the lower surface of the reliability supporting layer by a conventional method.

The specific examples of the material and thickness of the second primer layer are the same as those described above and will not be described.

Next, in step c-2), it is possible to perform the step of laminating the formed second primer layer so that one surface of the multi-functional layer, more preferably the prism micropattern layer of the multi-functional layer, is in contact with each other. At this time, the second primer layer may be cured after being laminated on the multi-functional layer in a semi-cured state and cured or coated on the multi-functional layer. The curing can be determined according to the kind of the polymer resin used as the second primer layer, and can be preferably cured through heat and / or light, and a specific method of performing the curing is a known method And is not particularly limited in the present invention.

In the step c-2), the second primer layer is laminated so as to be in contact with the prism micropattern layer of the multifunctional layer. In order to exhibit a more improved bonding force, the second primer layer may have reversed phase The engraving may be engraved. At this time, the degree of engraving can be engraved so as to correspond to a reverse phase of a part or all of the prism mountain portion with respect to one cross section of the prism. An improved bonding force can be exhibited when the second primer layer in which the pattern portion of the engraved pattern corresponding to the acid portion of the prism pattern and the second primer layer marked thereon are matched and bonded to each other.

At this time, the portion of the second primer layer where the negative angle of the reverse phase is not impressed may have a constant slope with respect to the light guide layer of the multifunctional layer. The inclination angle may be an inclination angle of about 1 to 4.5 degrees with respect to the light guide layer surface In this case, since the angle of incidence can be increased by the obtuse angle pattern at the interface of the second primer layer, more light is refracted, so that more light can be focused in the upward direction, There is an advantage that can be.

The prism fine patterned layer of the second primer layer and the multifunctional layer may be formed by bonding the space between the upper surface of the light guide layer of the multifunctional layer and the valley portion of the prism pattern formed on the upper surface, And a bottom surface of the prism pattern formed on the upper surface, and the space may be filled with a vacuum or an air layer.

Meanwhile, the steps (1) to (3) of the method for producing a composite reflective polarizing film according to a preferred embodiment of the present invention described above can be performed independently of the order, have.

23, the reliability supporting layer 300 in which the first primer layer 400 is formed on the lower surface of the reflective polarizer film 200 is formed by stacking the first primer layer 400 on the reflective polarizer film The first primer layer / reliable support layer laminated to the step (1) is applied to the star trolley 755 of FIG. 21, so as to perform the step (2) Or the first roll 820 of FIG. 23 to form a light diffusion layer on the upper surface of the reflective polarizing film, and then the step (3) may be performed.

27 is a cross-sectional view of the reflective polarizing film / reliable supporting layer / multi-functional layer laminated according to a preferred embodiment of the present invention, and the step (2) of laminating the reflective polarizing film 200 and the reliability supporting layer 400 (Step (2) to step (3)) by performing step (3) of bonding the multi-function layer 600 to the lower surface of the reliability supporting layer 400 (3) to (2)) by performing (2) a step of laminating the reflective polarizing film (200) and the reliability supporting layer (400) The laminated body in which the reflective polarizing film / reliable supporting layer / multi-functional layer is laminated can be produced by stacking the laminated reflective polarizing film / reliable supporting layer / multi-functional layer on the stroller 755 of FIG. 1 roll 820 to form a light diffusion layer on the upper surface of the reflective polarizing film, It is possible to manufacture the composite reflective polarizing film.

As described above, since the steps (1) to (3) can be performed in any order, the present invention is not particularly limited to any specific sequence.

The composite reflective polarizing film described above may be employed in a light source assembly or a liquid crystal display including the same, and may be used to enhance light efficiency. The light source assembly may be classified as a direct light source assembly in which the lamp is located at the bottom, an edge light source assembly in which the lamp is located at the side, and the like. The composite reflective polarizing film according to embodiments of the present invention may be applied to any kind of light source assembly . It is also applicable to a back light unit disposed below the liquid crystal panel or a front light unit disposed above the liquid crystal panel. Hereinafter, as an example of various applications, a composite reflective polarizing film according to an exemplary embodiment as shown in FIG. 5 is applied to a liquid crystal display including an edge light source assembly.

28 is a cross-sectional view of a liquid crystal display device according to an exemplary embodiment of the present invention. 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 for modulating the optical characteristics of the emitted light. The other components included in the backlight unit and the positional relationship between the other components and the composite reflective polarizing film 2111 Is not particularly limited in the present invention.

However, according to a preferred embodiment of the present invention, as shown in FIG. 28, the light emitted from the light source 2410 and the light source 2410 is guided to the front surface of the liquid crystal display device, A reflective film 2420 disposed under the light guide plate positioned below and below the polarizing film 2111 and the composite reflective polarizing film 2111 can be constructed and arranged.

At this time, the light source 2410 is disposed on both sides of the light guide layer of the composite reflective polarizing film 2111. The light source 2410 may be a light emitting diode (LED), a cold cathode fluorescent lamp (CCFL), a hot cathode fluorescent lamp (HCFL), or an external electro fluorescent lamp (EEFL). In another embodiment, the light source 2410 may be disposed only on one side of the light guide layer of the composite reflective polarizing film 2111. [

The light guiding layer of the composite reflective polarizing film 2111 moves the light emitted from the light source 2410 through total internal reflection and emits the light upward through a scattering pattern or the like formed on the bottom surface of the light guide layer. A reflective film 2420 is disposed under the light guide layer to reflect the light emitted downward from the light guide layer to the upper side.

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 reflective film 2420 and the composite reflective polarizing film 2111 may be housed by the bottom chassis 2440 to realize the backlight unit 2400.

The liquid crystal panel assembly 2500 includes a first display panel 2511, a second display panel 2512 and a liquid crystal layer (not shown) interposed therebetween. The liquid crystal panel assembly 2500 includes a first display panel 2511 and a second display panel 2512 And a polarizing plate (not shown) attached to the surface of the polarizing plate.

The liquid crystal display device 2700 may further include a top chassis 2600 covering the edges of the liquid crystal panel assembly 2500 and surrounding the sides of the liquid crystal panel assembly 2500 and the backlight unit 2400.

Specifically, FIG. 29 shows an example of a liquid crystal display device employing the composite reflective polarizing film of the present invention, in which a reflection plate 3280 is inserted on a frame 3270, and a cold cathode fluorescent lamp (3290). An optical film 3320 is disposed on the upper surface of the cold cathode fluorescent lamp 3290 and the optical film 3320 is disposed in the order of the diffusion plate 3321, the composite reflective polarizing film 3322, and the absorbing polarizing film 3323 However, the structure of the optical film and the stacking order between the respective structures may vary depending on the purpose, and some of the constituent elements may be omitted or a plurality thereof may be provided. Further, a phase difference film (not shown) or the like can also be inserted at an appropriate position in the liquid crystal display device. On the other hand, the liquid crystal display panel 3310 may be positioned on the upper surface of the optical film 3320 by being inserted into the mold frame 3300.

The light emitted from the cold cathode fluorescent lamp 3290 reaches the diffuser plate 3321 of the optical film 3320. The light transmitted through the diffuser plate 3321 passes through the composite reflective polarizing film 3322 to cause the light to proceed in the direction perpendicular to the optical film 3320 while the light is modulated. Specifically, the P wave transmits the reflection polarizing film without loss, but in the case of the S wave, light modulation (reflection, scattering, refraction, etc.) occurs and is reflected by the reflection plate 3280, which is the back surface of the cold cathode fluorescent lamp 3290, The properties of the light are randomly changed into a P wave or an S wave, and then pass through the composite reflective polarizing film 3322 again. And then reaches the liquid crystal display panel 3310 after passing through the absorption polarizing film 3323. [ Meanwhile, the cold cathode fluorescent lamp 3290 may be replaced with an LED.

The embodiments described above can effectively exhibit a plurality of light modulation characteristics and can improve brightness by using the composite reflective polarizing film according to one embodiment of the present invention, It is possible to prevent appearance defects appearing on the appearance and to secure the reliability of the composite reflective polarizing film even in a high temperature and high humidity environment where a liquid crystal display device is used. Further, by integrating the light-diffusing layer and the multi-function layer having functions into the reflective polarizing film, the thickness of the light source assembly can be reduced, and the assembling process can be simplified. Accordingly, the image quality of a liquid crystal display including such a light source assembly can be improved.

In the present invention, the use of the reflective polarizing film has been described mainly with respect to a liquid crystal display, but the present invention is not limited thereto, and can be widely used in flat panel display technologies such as a projection display, a plasma display, a field emission display and an electroluminescence display.

The present invention will now be described more specifically with reference to the following examples. However, the following examples should not be construed as limiting the scope of the present invention, and should be construed to facilitate understanding of the present invention.

≪ Example 1 >

(PEN) having a refractive index of 1.65 as a dispersion component, and polycyclohexylenediamine (PEN) having a polymerization activity of 1: 2 by mole ratio of terephthalate, ethyl glycol and cyclohexane dimethanol to 60% by weight of polycarbonate as a base component 38% by weight of methyl cyclohexylene dimethylene terephthalate (PCTG) and 2% by weight of a heat stabilizer containing phosphate The raw materials were respectively fed into the first extruder and the second extruder. 38% by weight of polycyclohexylene dimethylene terephthalate (PCTG) polymerized with 60% by weight of polycarbonate as a skin layer component and terephthalate, polymerization reaction of ethyl glycol and cyclohexane dimethanol at a molar ratio of 1: 2, 2 wt% of a phosphate stabilizer was added to the third extruder.

The extrusion temperature of the base component and the dispersion component was adjusted to 245 占 폚, and Cap. The polymer flow was adjusted through adjustment, and the dispersion fluid was randomly dispersed in the substrate through the passage through which the filteration mixer was applied. Then, the skin layer components were laminated on both sides of the substrate layer component. The spread of the polymer was induced in the coat hanger dies of Figs. 19 and 20, which corrected the flow rate and pressure gradient. 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. Then, a smoothing process was performed on the cooling and casting rolls and stretched 6 times in the MD direction. Then, heat setting was performed through a heater chamber at 180 ° C for 2 minutes to produce a randomly distributed reflective polarizing film having a thickness of 120 μm (thickness including a skin layer of 300 μm). (Nx: 1.88, ny: 1.58, nz: 1.58) of the polyethelene naphthalate (PEN) component of the produced reflective polarizing film, and the content of terephthalate, ethyl glycol and cyclohexanedimethanol 1: 38 wt.% Of polycyclohexylene dimethylene terephthalate (PCTG) polymerized in a molar ratio of 2: 1 and a refractive index of 2 wt.% Of a phosphate-containing heat stabilizer was 1.58. At this time, the thickness of the core layer was 120 占 퐉, and the thickness of the skin layer was 40 占 퐉, respectively, and the total thickness of the reflective polarizing film was 200 占 퐉.

Thereafter, the produced reflective polarizing film was subjected to a process as shown in FIG. 21 to form a light-diffusing layer including a urethane acrylic micro lens pattern having a refractive index of 1.59 on the upper surface of the reflective polarizing film. At this time, the height of the lens in the microlens pattern was 20 mu m.

On the other hand, on the lower surface of a polyethylene terephthalate (PET) film (EXCEL, Toray Advanced Material) having a thickness of 188 占 퐉 obtained by biaxially stretching four times in the longitudinal direction and in the transverse direction respectively and thermally fixed at 190 占 폚 by using the reliability supporting layer, DPHA (Dipentaerythritol Hexaacrylate ), 15 wt% of dipentaerythritol pentaacylate (DPPA), 12 wt% of trimethylolpropane triacylate (TMPTA), 25 wt% of phenoxyethyl acrylate (PEA), 20 wt% of isobornyl methacrylate (IBOA) A reliable support layer having a thickness of 5 탆 was formed on a second primer layer containing 8% by weight of methacrylate (2-HEMA) and 5% by weight of 2-hydroxyethyl acrylate (2-HEA) Layer prism fine pattern layer were brought into contact with each other. At this time, the multifunctional layer is a urethane acryl prismatic pattern having a refractive index of 1.59 (20 탆 in height and 40 탆 in pitch) through a process as shown in Fig. 25 on the upper surface of a polycarbonate film (Glacel, Tourei Chemical) Mu m).

Thereafter, 15 wt% of DPHA (Dipentaerythritol Hexaacrylate), 15 wt% of DPPA (Dipentaerythritol Pentaacylate), 12 wt% of TMPTA (trimethylolpropane triacylate), 25 wt% of phenoxyethyl acrylate (PEA) A first primer was formed to a thickness of 5 탆 on the first primer including 20 wt% of methacrylate (IBOA), 8 wt% of 2-hydroxyethyl methacrylate (2-HEMA) and 5 wt% of 2-hydroxyethyl acrylate (2-HEA) A composite reflective polarizing film as shown in Table 1 was prepared by lamination such that the lower surface of the reflective polarizing film on which the diffusion layer was formed and the surface of the PET supporting the reliability supporting layer on which the first primer was formed were in contact with each other.

≪ Examples 2 to 11 >

A composite reflective polarizing film was produced in the same manner as in Example 1 except for the conditions shown in Table 1 below.

The height of the lenticular lens of Example 8 was 20 mu m and the pitch was 40 mu m, and the height of the prism pattern of Example 9 was 20 mu m and the pitch was 40 mu m.

The PET film used as the reliability supporting layer in Example 10 was a PET film (Toyobo Co.) having a thermal expansion coefficient of 27.27 占 퐉 / m 占 폚 at a temperature range of 70 to 80 占 폚.

≪ Example 11 >

A polymer reflection polarizing film was prepared in the same manner as in Example 1 except that a randomly dispersed reflective polarizing film was produced by the following method to prepare a composite reflective polarizing film as shown in Table 2.

The plate-like polymer-dispersed reflective polarizing film was processed as shown in Fig. Specifically, a mixture of PEN having a refractive index of 1.65 as a first component and dimethyl terephthalate and dimethyl-2,6-naphthalene dicarboxylate as a second component in a molar ratio of 6: 4 was mixed with ethylene glycol (EG) and 1 : 2, a refractive index of 1.64 and a refractive index obtained by polymerizing 90 wt% of polycarbonate and 10 wt% of polycyclohexylene dimethylene terephthalate (PCTG) as a skin layer component 1.58 were injected into the first extruding part 220, the second extruding part 221 and the third extruding part 222, respectively. The extrusion temperature of the first component and the second component was adjusted to 295 캜 and the Cap flow meter was calibrated through IV adjustment to adjust the polymer flow, and the skin layer was subjected to the extrusion process at a temperature of 280 캜. 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 amounts of the first pressurizing means are respectively 8.9 kg / h and 8.9 kg / h, respectively. And a sea-island type mixed flow was produced by using the sea-island extrusion-opening as shown in Fig. Specifically, the number of layers of the fourth component distribution plate (T4) was 400, the diameter of the hole of the component supply channel was 0.17 mm, and the number of the component supply channels was 25,000. The diameter of the discharge port of the sixth corrugated distribution plate was 15 mm x 15 mm. In the three-layered feed block, skin layer components flowed from the third extruded portion through the flow path to form a skin layer on the upper and lower surfaces of the sea-island composite stream (core layer polymer). Spreading was induced in the coat hanger dies of Figs. 19 and 20 in which the core layer polymer having the skin layer formed so as to have an aspect ratio of the sea-island complex flow of 1/30295 was corrected for flow velocity and pressure gradient. Specifically, 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. Then, a smoothing process was performed on the cooling and casting rolls and stretched 6 times in the MD direction. As a result, the major axis length of the first component was not changed but the minor axis length was decreased. Thereafter, thermal fixation was carried out through an IR heater at 180 ° C for 2 minutes to produce a reflective polarizing film in which the polymer was dispersed as shown in Fig. The refractive index of the first component of the produced 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, the minor axis length (thickness direction) was 84 nm, the major axis length was 15.5 mm, and the average optical thickness was 138 nm. The thickness of the fabricated reflective polarizing film core layer was 59 탆, and the total thickness of the skin layer was 141 탆.

≪ Examples 12 to 22 >

A composite reflective polarizing film was produced in the same manner as in Example 1 except for the conditions shown in Tables 2 and 3 below.

≪ Comparative Examples 1 and 2 &

A composite reflective polarizing film was produced in the same manner as in Example 1 except for the conditions shown in Table 4 below.

<Experimental Example>

The following properties were evaluated for the reflection type polarizers prepared by the above-mentioned Examples and Comparative Examples, and the results are shown in Tables 1 and 2. &lt; tb &gt;&lt; TABLE &gt;

1. Relative luminance

The brightness of the composite reflective polarizing film was measured in the following manner. The panel was assembled on an edge-type backlight unit as shown in FIG. 28 having a diffusion plate and a composite reflective polarizing film, and the brightness was measured at nine points using a BM-7 meter of Topcon Co. The average value was shown.

The relative luminance is a relative value of the luminance of the other examples and the comparative example when the luminance of the composite reflective polarizing film of Example 1 is taken as 100. [

2. Visible lines

The panel was assembled on a 32 "direct underlying type backlight unit equipped with a composite reflective polarizing film, a diffusion plate, a diffusion sheet, a prism sheet, and a brightness enhancement film, and then evaluated for a bright line appearance. Specifically, the bright line visibility was evaluated by visually observing a bright line, and the number of bright lines was evaluated as 0 excellent, 1 good, 2 to 3 normal, and 4 to 5 or more poor.

3. Polarization degree

The degree of polarization was measured using a RETS-100 analyzer from OTSKA.

4. Haze measurement

Reliability The haze was measured using a haze and permeability analyzer (Nippon Denshoku Kogyo Co.) analysis equipment for the support layer.

5. Whether a foreign object

The appearance of the composite reflective polarizing film was visually observed to evaluate whether the foreign substance in the film was visible to the naked eye. As a result, the result was expressed as 0 when no foreign matter was observed and 1 to 5 according to the degree of foreign matter being visually observed.

6. Reliability assessment

The composite reflective polarizing film was allowed to stand at 60 DEG C and 75% relative humidity, and then 96 hours was first observed. After that, the degree of change was observed up to 1000 hours to evaluate whether the appearance of the composite reflective polarizing film was changed or wrinkles were formed . The evaluation results were 0 for no change in appearance, and 1 to 5 for the greater degree of change.

7. Mathematical satisfaction

When the value of the following expression (1) satisfies 0.16 to 2.0, it is indicated as?, When it is unsatisfactory, it is represented as 占 and when the value of the following expression (2) satisfies 0.25 to 4.0,?

[Equation 1]

&Quot; (2) &quot;

Specifically, as can be seen from Tables 1 to 4,

Examples 1 to 5 were superior to those of Examples 6 and 7 in luminance, polarization and bright line appearance. According to a preferred embodiment of the present invention, Example 1 belonging to the 1/3 group range exhibited excellent optical properties as compared with Examples 2 to 4 which do not satisfy this requirement. Furthermore, the optical properties of Example 1 were superior to those of Example 5 in which the content of one group was out of the range.

It can also be seen from Examples 1, 8 and 9 that the fine pattern included in the light-diffusing layer is significantly superior in surface appearance quality due to the rise in haze when the microlenses are in the form of prisms or lenticular lenses.

In addition, it can be confirmed from Example 10 that the reliability can be lowered as compared with Example 1 when the thermal expansion coefficient of the reliability supporting layer exceeds 25 탆 / m 캜.

Further, it can be confirmed that Example 11 in which the reflection type polarizing film of the plate-type polymer dispersion type was changed was not very good in optical characteristics such as brightness than Example 1. [

Further, in Comparative Example 1 in which the multifunctional layer was not included in contrast to Example 1, it was confirmed that the light-guiding function such as luminance was not performed and the optical characteristics were remarkably lowered. Further, the haze value remarkably decreased, and foreign matter and bright lines appeared.

In Comparative Example 2, which did not include the reliability supporting layer, the optical properties such as luminance were improved as compared with Example 1, but the surface appearance of the film was severely wrinkled or curved, and the reliability was not significantly improved.

Further, it can be seen that Example 1 and Examples 13 to 17 satisfying Formula (1), which is a preferred condition of the present invention, have remarkably excellent optical properties and reliability such as luminance as compared with unsatisfactory Examples 12 and 18, 12 is too thin as the light guide layer, and the function of the light guide layer is not properly performed, so that the decrease of the brightness is remarkable. In addition, in Example 18, the light guide layer was too thick, which was not good in terms of thinning of the composite reflective polarizing film.

Also, in the case of satisfying the expression (1) according to the present invention, Examples 20 and 22, which are unsatisfactory in the expression (2), show that defects such as wrinkles or bending are generated on the surface or a large decrease in luminance Can be confirmed.

Claims (26)

A composite reflective polarizing film comprising a reflective polarizing film in which a polymer is dispersed in a substrate,
A light diffusion layer formed on an upper surface of the reflective polarizing film;
A reliable supporting layer formed on a lower surface of the reflective polarizing film; And
And a multifunctional layer formed on the lower portion of the reliability supporting layer to guide and condense the light emitted from the light source.
The method according to claim 1,
Wherein the light diffusing layer comprises at least one polymer resin selected from the group consisting of a photocurable polymer resin and a thermosetting polymer resin.
The light-emitting device according to claim 1, wherein the light-
At least one fine patterned layer selected from the group consisting of a prism, a lenticular, a micro lens, a triangular pyramid, and a pyramid pattern; And a bead coating layer; Wherein the reflective polarizing film comprises at least one of the following materials.
The method of claim 3,
Wherein the light diffusing layer comprises a micropatterned layer and the micropatterned layer comprises a microlens.
The method according to claim 1,
Wherein the reliability supporting layer is a polyester film stretched in at least one direction.
The method according to claim 1,
Wherein the reflective polarizing film has a thickness of 10 to 400 mu m.
The method according to claim 1,
And a first primer layer for enhancing adhesion between the reflective polarizing film and the reliable supporting layer.
The method according to claim 1,
Wherein at least one of the reliability supporting layer and the light guide layer of the multi-functional layer satisfies a thermal expansion coefficient of 4 to 25 占 퐉 / m 占 폚 at a temperature condition of 70 to 80 占 폚.
The liquid crystal display according to claim 1, wherein the reflective polarizing film
And a plurality of dispersing members contained in the substrate to transmit the first polarized light emitted from the outside and reflect the second polarized light,
The plurality of dispersing bodies are different in refractive index from the substrate in at least one axial direction,
Wherein at least 80% of the plurality of dispersions contained in the substrate have an aspect ratio of a minor axis length to a major axis length of 1/2 or less with respect to a vertical cross section in the longitudinal direction,
The dispersions having the aspect ratio of 1/2 or less are included in at least three groups according to the cross-sectional area,
Dispersion of the cross-sectional area of the first group of the group is 0.2 ~ ² 2.0㎛, and dispersion of the cross-sectional area of the second group is at most ² from 5.0㎛ 2.0㎛ ^2, greater than the cross-sectional area of the dispersion according to the third group is greater than ² from 5.0㎛ 10.0 占 퐉 ² or less,
Wherein the dispersions of the first group to the third group are randomly arranged.
The method of claim 9, wherein the reflective polarizing film
A core layer comprising a substrate and a plurality of dispersions contained in the substrate; And
And an integrated skin layer formed on at least one side of the core layer.
10. The method of claim 9,
Wherein the number of dispersions of the third group among the dispersions having the aspect ratio of 1/2 or less is 10% or more.
10. The method of claim 9,
Wherein the number of dispersions of the first group is 30 to 50% and the number of dispersions of the third group is 10 to 30% among the dispersions having the aspect ratio of 1/2 or less.
10. The method of claim 9,
Wherein the ratio of the number of dispersions of the first group to the number of dispersions of the third group among the dispersions having the aspect ratio of 1/2 or less is 3 to 5: 1.
10. The method of claim 9,
Wherein the refractive index of the base material and the dispersion body is 0.05 or less in refractive index with respect to the two axial directions and the difference in refractive index with respect to the remaining one axial direction is 0.1 or more.
The method according to claim 1,
Wherein the reflective polarizing film is stretched in at least one axial direction.
The multi-functional layer according to claim 1,
A fine pattern layer for condensing the light irradiated from the light source; And
And a light guide layer formed below the fine pattern layer and supporting the fine pattern layer and guiding light emitted from the light source.
17. The method of claim 16,
Wherein the fine pattern layer comprises at least one fine pattern selected from the group consisting of a prism, a lenticular, a micro lens, a triangular pyramid, and a pyramid pattern.
18. The method of claim 17,
Wherein the fine pattern layer comprises a prism fine pattern.
17. The method of claim 16,
Wherein the light guide layer comprises polycarbonate.
The method according to claim 1,
Wherein the multi-function layer includes a light guide layer,
Wherein the thickness of the light guide layer, the thickness of the reflective polarizing film, and the thickness of the reliability supporting layer satisfy the following equation (1): 2.2 to 6.5.
[Equation 1]

The method according to claim 1,
And a second primer layer for enhancing adhesion between the reliability supporting layer and the multi-functional layer.
21. The method of claim 20,
Wherein the thickness of the reflective polarizing film, the thickness of the reliability supporting layer, and the thickness of the light guide layer of the multi-functional layer satisfy a value of 2.5 to 5.8.
21. The method of claim 20,
Wherein the thickness of the reliability supporting layer and the thickness of the light guide layer in the multifunctional layer have a value of 0.06 to 0.55.
&Quot; (2) &quot;

The method according to claim 1,
Wherein the composite reflective polarizing film has a haze value of 90% or more.
A backlight unit comprising a composite reflective polarizing film according to any one of claims 1 to 24.
26. A liquid crystal display comprising the backlight unit according to claim 25.

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