KR20110076331A - Integrating brightness enhancement film formed pattern - Google Patents

Abstract

PURPOSE: An integration type brightness-enhanced film including a pattern is provided to increase brightness in comparison with a prior brightness-enhanced film. CONSTITUTION: A brightness-enhanced film is formed with a lamination of a first supporting film(110), a reflective polarization film(120), and a second supporting film(130). The first supporting film has a shape of a lens. The reflective polarization film is formed with a fabric. A ratio of height to diameter in the shape of the lens is 1.5:20 to 6:20.

Description

Integrated brightness enhancement film formed pattern

The present invention relates to a luminance-enhanced film in which a pattern is formed, and more particularly, to a luminance-enhanced film in which a pattern is formed by integrally stacking a first support film, a reflective polarizing film, and a second support film.

Recently, various flat panel display devices have been developed. The flat panel display devices include liquid crystal displays (LCDs), plasma display panels (PDPs), and field emission displays (FEDs). In addition, studies are being actively conducted to improve the display quality of such flat panel displays.

Among them, LCD is a device that injects liquid crystal between two sheets of glass and applies power to the electrodes installed on the upper and lower glass plates to change the arrangement of liquid crystal molecules and display images in each pixel. Such an LCD display device is usually composed of an LCD panel unit, a driver, and a backlight unit. The LCD panel does not emit light by itself and has only a function of transmitting light on the rear surface. Therefore, in the absence of light, that is, at night or indoors, it is a structure that can not display images without the help of backlight. The backlight unit refers to a system for implementing the backlight of such an LCD. LCD Currently, the range of use of laptops, personal computer monitors, LCD TVs, automobiles, and airplanes is expanding, accounting for about 80% of the flat panel market, and the global demand for LCDs has soared.

Conventional LCDs arrange liquid crystals and electrode matrices between a pair of light absorbing optical films. In LCDs, the liquid crystal portion has an optical state that is changed accordingly by moving the liquid crystal portion by an electric field generated by applying voltage to two electrodes. This process displays an image of a 'pixel' carrying information using polarization in a specific direction. For this reason, LCDs include a front optical film and a back optical film that induce polarization.

Such LCD liquid crystal display devices do not have high utilization efficiency of light emitted from the backlight. This is because more than 50% of the light emitted from the backlight is absorbed by the rear optical film. Therefore, in order to increase the utilization efficiency of the backlight light in the liquid crystal display device, a brightness enhancing film is provided between the optical cavity and the liquid crystal assembly.

 1 illustrates the optical principle of a conventional brightness enhancement film.

 Specifically, P-polarized light from the optical cavity to the liquid crystal assembly passes through the luminance-enhanced film to be transmitted to the liquid crystal assembly, and S-polarized light is reflected from the luminance-enhanced film to the optical cavity, and then the light is reflected on the diffuse reflection surface of the optical cavity. The polarization direction is reflected in a randomized state and then transmitted to the luminance-enhanced film, which eventually converts the S-polarized light into P-polarized light that can pass through the polarizer of the liquid crystal assembly, and then passes the luminance-enhanced film to the liquid crystal assembly. .

Selective reflection of S-polarized light and transmission of P-polarized light with respect to incident light of the luminance-enhanced film are performed in a state where a flat optical layer having anisotropic refractive index and a flat optical layer having an isotropic refractive index are alternately stacked in multiple layers. The difference in refractive index between each optical layer and the optical thickness of each optical layer according to the stretching process of the stacked optical layer and the refractive index change of the optical layer.

That is, the light incident on the luminance-enhanced film repeats the reflection of S-polarized light and the transmission of P-polarized light while passing through each optical layer, and eventually only the P-polarized light of the incident polarization is transmitted to the liquid crystal assembly. On the other hand, the reflected S-polarized light is reflected in a state in which the polarization state is randomized at the diffuse reflection surface of the optical cavity and is transmitted to the luminance-enhanced film as described above. As a result, power loss can be reduced together with the loss of light generated from the light source.

However, such a conventional brightness enhancement film has an optical thickness between the optical layers that can be optimized for the selective reflection and transmission of incident polarization by extending the isotropic optical layer and the anisotropic optical layer on the plate having different refractive indices alternately. Since it is manufactured to have a refractive index, there is a problem that the manufacturing process of the luminance-enhanced film is complicated.

In particular, since each optical layer of the luminance-enhanced film has a flat plate structure, it is necessary to separate P-polarized light and S-polarized light in response to a wide range of incidence angles of incident polarization. There was a growing problem. In addition, due to the structure in which the number of laminated layers of the optical layer is excessively formed, there is a problem that the optical performance decrease due to light loss.

Accordingly, it has been desired to develop a luminance-enhanced film in which the luminance is further increased while improving performance degradation due to light loss in the luminance-enhanced film.

In order to solve the above problems, an object of the present invention is to provide a film in which the brightness is further improved as compared to the general brightness enhancement film in the brightness enhancement film.

In order to achieve the above object, the present invention is a luminance optical film that is sequentially laminated with a first support film, a reflective polarizing film and a second support film, the surface of the first support film is made of a lens shape, the reflection Polarizing film is made of a fabric, the ratio of the height (H) and diameter (D) of the lens shape provides an integrated luminance-enhanced film with a pattern, characterized in that 1.5: 20 to 6:20.

In another aspect, the present invention provides an integrated luminance-enhanced film having a pattern, characterized in that the tangential angle (Q) with the surface in the lens shape is 120 to 165 °.

In another aspect, the present invention provides a monolithic luminance-enhanced film is formed with a pattern, characterized in that the illumination is given to the second support film.

In another aspect, the present invention provides an integrated luminance-enhanced film having a pattern, characterized in that the lens shape is in close contact with the same size and uniformly arranged and the diameter (D) of the lens shape is 30 to 60㎛.

In another aspect, the present invention provides an integrated luminance-enhanced film with a pattern, characterized in that the distance between the lens shape (L) is 0 to 60㎛.

In another aspect, the present invention provides an integrated luminance-enhanced film having a pattern, characterized in that the first support film and the second support film is isotropic and is a polymer resin of the same material.

In addition, the present invention is the first support film and the second support film polyethylene naphthalate (PEN), copolyethylene naphthalate (co-PEN), polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PC) Alloy, polystyrene (PS), heat-resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene (ABS) , Polyurethane (PU), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polyamide (PA), polyacetal (POM), phenol , Epoxy (EP), urea (UF), melanin (MF), unsaturated polyester (UP), silicone (SI), elastomer and cycloolefin polymer formed with a pattern, characterized in that it comprises at least one of To provide.

In another aspect, the present invention provides an integrated luminance-enhanced film with a pattern, characterized in that the refractive index of the first support film and the second support film is 1.4 to 2.0.

In another aspect, the present invention provides a monolithic luminance-enhanced film is formed with a pattern, characterized in that the fabric is made of island-in-the-sea yarn.

The present invention also provides an integrated luminance-enhanced film having a pattern, characterized in that the sea portion of the island-in-the-sea yarn is isotropic and the island portion is anisotropic.

In addition, the present invention, the material of the island-in-the-sea yarn is polyethylene naphthalate (PEN), copolyethylene naphthalate (co-PEN), polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PC) alloy, polystyrene (PS) ), Heat-resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene (ABS), polyurethane (PU) , Polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polyamide (PA), polyacetal (POM), phenol, epoxy (EP), Provided is an integrated luminance-enhanced film having a pattern, characterized in that at least one of urea (UF), melanin (MF), unsaturated polyester (UP), silicone (SI), elastomer and cycloolefin polymer.

The present invention also provides an integrated luminance-enhanced film having a pattern, characterized in that the thickness of the island-in-the-sea yarn is 0.3 to 20 denier.

The present invention also provides an integrated luminance-enhanced film having a pattern, wherein the refractive index of the sea portion of the island-in-the-sea yarn is the same as that of the first and second support films.

The luminance-enhanced film according to the present invention further improves the luminance as compared to the general luminance-enhanced film, about 1 to 2% compared to the luminance-enhanced film without the lens shape, and about 5% compared to the luminance-enhanced film to give the lens shape. Has the effect of improving the luminance.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

As used herein, the terms "about", "substantially", and the like, are used at, or in close proximity to, numerical values as are indicative of preparation and material tolerances inherent in the meanings mentioned, and are intended to be accurate or to facilitate understanding of the invention. Absolute figures are used to prevent unfair use by unscrupulous infringers.

As used herein, the term "film" is used to mean a film, sheet, plate, or the like having a predetermined width and thickness.

In addition, the term "tangential angle" is defined as meaning the angle between the tangent line and the surface at the point where the lens shape is in contact with the surface.

In addition, "isotropic" means that the refractive index is constant regardless of the direction when light passes through the object.

In addition, "anisotropy" is a concept corresponding to isotropy, the optical properties of the object is different depending on the direction of the light, the anisotropic object has a birefringence.

In addition, "light modulation" means that the irradiated light is reflected, refracted, scattered, or the intensity of the light, the period of the wave, or the nature of the light is changed.

2 and 3 are cross-sectional views of the integrated luminance-enhanced film with a pattern formed in accordance with a preferred embodiment of the present invention, the luminance-enhanced film is formed including a first support film, a reflective polarizing film and a second support film do.

The luminance-enhanced film according to the present invention is characterized in that the first support film has a lens shape, wherein the first support film indicates a direction in which light is emitted. When the ratio of the height (Height, H) and the diameter (Diameter, D) occurs in the lens shape of the first support film, there is a characteristic that the brightness is changed. It has been found that especially at a constant ratio of diameter D, the luminance is improved.

The luminance-enhanced film according to the preferred embodiment of the present invention is characterized in that to form a surface shape on the first support film 110, the reflective polarizing film 120 between the first support film 110 and the second support film 130 However, the surface of the first support film 110 is formed of a lens shape 111, the ratio of the height (H) and diameter (D) of the lens shape 111 is preferably 1.5: 20 to 6:20. Within this range, the brightness is increased as compared with the hemispherical lens shape or the brightness-enhancing film without the lens shape.

In addition, it is preferable that the tangent angle Q formed between the tangent line and the surface at the point of contact with the surface of the lens shape 111 is 120 to 165 °. When the lens shape is formed within the above range, the brightness is increased by about 5% compared to the brightness enhancement film having the hemispherical lens shape, and the brightness is increased by 1 to 2% compared to the brightness enhancement film without the lens shape.

Lens shape 111 of the first support film 110 is preferably a diameter (D) of 30 to 60㎛. Although the light condensing effect is excellent within the above range, when the diameter (D) exceeds 60 μm, there occurs a problem that moiré phenomenon occurs. In addition, the lens shape 111 is uniformly arranged by a plurality of lenses in close contact with the same size, the array of lens shape 111 is characterized in that evenly arranged at an angle of 60 ° in the form of an equilateral triangle when connecting the rounded origin. (See Figure 4)

In addition, it is preferable that the distance L between the lens shapes 111 is 0 to 60 μm, and the luminance is improved within the above range.

In the present invention, the characteristics of the material used as the first support film 110 and the second support film 130 are as follows. The first support film 110 and the second support film 130 has optical isotropy, the refractive index is preferably 1.4 ~ 2.0. Such materials include thermoplastic and thermoset polymers that transmit the desired wavelength of light. Suitable films may preferably be amorphous or semicrystalline and may comprise homopolymers, copolymers or blends thereof. Specifically poly (carbonate) (PC); Syndiotactic and isotactic poly (styrene) (PS); Alkyl styrenes; Alkyl, aromatic and aliphatic ring containing (meth) acrylates including poly (methylmethacrylate) (PMMA) and PMMA copolymers; Ethoxylated and propoxylated (meth) acrylates; Polyfunctional (meth) acrylates; Acrylated epoxy; Epoxy; And other ethylenically unsaturated substances; Cyclic olefins and cyclic olefin copolymers; Acrylonitrile butadiene styrene (ABS); Styrene acrylonitrile copolymer (SAN); Epoxy; Poly (vinylcyclohexane); PMMA / poly (vinylfluoride) blends; Poly (phenylene oxide) alloys; Styrene block copolymers; Polyimide; Polysulfones; Poly (vinyl chloride); Poly (dimethylsiloxane) (PDMS); Polyurethane; Unsaturated polyesters; Polyethylene; Poly (propylene) (PP); Poly (alkane terephthalates) such as poly (ethylene terephthalate) (PET); Poly (alkane naphthalate) such as poly (ethylene naphthalate) (PEN); Polyamides; Ionomers; Vinyl acetate / polyethylene copolymers; Cellulose acetate; Cellulose acetate butyrate; Fluoropolymers; Poly (styrene) -poly (ethylene) copolymers; PET and PEN copolymers, including polyolefin PET and PEN; And poly (carbonate) / aliphatic PET blends. More preferably, polyethylene naphthalate (PEN), polyethylene naphthalate copolymer (co-PEN) polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PC) alloy, polystyrene (PS), heat resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene (ABS), polyurethane (PU), polyimide ( PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polyamide (PA), polyacetal (POM), phenol, epoxy (EP), urea (UF) , Melanin (MF), unsaturated polyester (UP), silicone (SI), elastomer, cycloolefin polymer (COP, Japan ZEON Co., JSR Co., Ltd.) may be prepared as a film alone or mixed. In addition, the melting point of the material is preferably 140 to 180 ° C, but is not limited thereto.

In addition, the first support film 110 and the second support film 130 is preferably used of the same material with the same refractive index. Since the P-polarized light passing through the second support film 130 may cause light modulation in the first support film 110 due to refraction, the luminance may be degraded, and thus, the same material having the same refractive index may be used.

In addition, antioxidants, light stabilizers, heat stabilizers, lubricants, dispersants, ultraviolet absorbers, white pigments, fluorescent brighteners, etc., so long as the physical properties of the first support film 110 and the second support film 130 are not impaired. It may contain an additive of.

In addition, the surface of the second support film 130 may be matte to provide roughness 131 to prevent scratches from occurring outside.

On the other hand, the reflective polarizing film 120 used in the present invention is preferably made of a fabric. The fabric is characterized as follows.

The fabric may be formed by weaving the fibers at an angle with the weft yarn, it is preferable that the fibers are sea island yarn. In addition, any one of the weft and the warp yarn is island-in-the-sea yarn, the other may be isotropic fibers. The weft yarn or warp yarn may be formed by gathering 1 to 200 strands.

The island-in-the-sea yarn has birefringence, and the light incident from the light source is reflected , scattered, and refracted at the birefringent interface, which is an interface between the birefringent island-in-the-sea yarn and the isotropic support film , thereby generating light modulation, thereby dramatically improving luminance. Specifically, light irradiated from an external light source can be largely divided into S polarization and P polarization. When only a specific polarization is desired, P polarization passes through the luminance-enhanced film without being affected by the birefringent interface, whereas S polarization is When the birefringent interface is modulated into a wavelength of refraction, scattering, and reflection, that is, S-polarized light or P-polarized light, and is reflected and irradiated onto the luminance-enhanced film, P-polarized light passes through the luminance-enhanced film and S-polarized light is scattered again. It is reflected. If this process is repeated, the desired P polarization can be obtained.

Therefore, when a plurality of polymers having a birefringent interface on the support film and the interface are disposed in the support film, the luminance can be improved remarkably without a conventional luminance-enhanced film laminated.

Accordingly, a birefringent island-in-the-sea yarn was used as the polymer having the birefringent interface and manufactured in the form of a fabric to overcome the above-mentioned problems. More specifically, when the birefringent island-in-the-sea yarn was used, it was confirmed that the effect of improving the light modulation efficiency and luminance was significantly improved than when using the conventional fiber. More specifically, the island portion of the portion constituting the island-in-the-sea yarn has birefringence, and the sea portion partitioning the island portion has isotropy. In this case, not only the interface between the island-in-the-sea yarn and the supporting film, but also the boundary surfaces of the islands and sea portions of the island-in-the-sea yarn have a birefringent interface, so that a birefringent interface occurs only at the interface between the support film and the birefringent fibers. Compared with birefringent fibers, the light modulation effect is remarkably increased, which can be applied to actual industrial sites in place of the laminated luminance-enhanced film.

Therefore, the use of birefringent island-in-the-sea yarn is superior to the use of ordinary birefringent fibers, and the efficiency of brightness enhancement is excellent. What can form an interface is that the brightness enhancement efficiency can be remarkably improved as compared with the case where it is not.

Furthermore, in the case of producing a composite fiber by twisting multiple strands or dozens of islands, for example, when manufacturing one composite fiber by twisting 10 islands or yarns, the composite fiber has 100 birefringent interfaces and at least 100 times of light. Modulation can occur.

After all, if a conventional island-in-the-sea yarn utilizes the remaining island portion as a micro-fine yarn by eluting the sea portion irrespective of birefringence to produce microfiber, the present invention does not elute the sea portion of the island-in-the-sea island rather than the sea portion and island portion. It is assumed that the island-in-the-sea yarn having different optical properties is used by itself. In the present invention, only the case where the island portion is composed of anisotropy and the sea portion is isotropic is assumed, but the object of the present invention may be achieved in the opposite case. .

The island-in-the-sea yarn may preferably use a material that is optically birefringent and excellent in light transmittance. Preferably, a material having the same material as the support film but having birefringence may be used. On the other hand, a method for changing an isotropic material to birefringence is commonly known and, for example, when drawn under suitable temperature conditions, the polymer molecules are oriented so that the material becomes birefringent.

The material that can be used as the island-in-the-sea yarn is polyethylene naphthalate (PEN), copolyethylene naphthalate (co-PEN), polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PC) alloy, polystyrene (PS), heat-resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene (ABS), polyurethane ( PU), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polyamide (PA), polyacetal (POM), phenol, epoxy (EP ), Urea (UF), Melanin (MF), Unsaturated Polyester (UP), Silicone (SI), Elastomer and Cycloolefin polymer can be selected as one or more of the one or more of which can be used as sea component and island component, respectively In this case, either sea part or island part isotropically And in the other one It can be comprised anisotropically. Preferably, the sea portion is isotropic and the island portion may be anisotropic. For example, the sea portion of the islands in the sea island may use isotropic polycarbonate (PC) and the island portion may use polystyrene (PS) having birefringence. .

On the other hand, in the island-in-the-sea yarn having the optical isotropic support film and the birefringence, the magnitude of the substantial coincidence or mismatch of the refractive indices along the X, Y and Z axes in the space affects the degree of scattering of the light polarized along the axis. In general, the scattering power varies in proportion to the square of the refractive index mismatch. Thus, the greater the degree of mismatch in refractive index along a particular axis, the more strongly scattered light polarized along that axis. Conversely, when the mismatch along a particular axis is small, the light polarized along that axis is scattered to a lesser extent. If the index of refraction of the support film along a certain axis is substantially coincident with the index of refraction of the islands of the islands, the incident light polarized by an electric field parallel to these axes is not scattered, regardless of the size, shape and density of the portion of the islands of the islands. Will pass. Also, when the refractive indices along that axis are substantially coincident, the light beam passes through the object without being substantially scattered.

Therefore, the refractive index of the first support film 110 and the second support film 130 and the refractive index of the island-in-the-sea yarn have a difference in refractive index of 0.03 or less in two axial directions and a difference in refractive index in the other one axial direction of 0.05 or more. desirable. In this case, the P wave passes through the birefringent interface between the support film and the island-in-the-sea yarn, but the S wave causes light modulation to be reflected, scattered, or refracted, and then converted into the S wave or P wave form, of which P wave passes through the support film and S The wave again causes light modulation.

Specifically, the birefringent island-in-the-sea yarn is preferably isotropic in the sea portion and anisotropic in the island portion, the refractive index in the x-axis direction of the anisotropic island portion is nX3, the refractive index of the y-axis direction is nY3 and the refractive index of the z-axis direction is nZ3 When the refractive index in the x-axis direction of the solution portion is nX4, the refractive index in the y-axis direction is nY4 and the refractive index in the z-axis direction is nZ4, the absolute value of the difference between the refractive indexes of the nX3 and nX4 is 0.05 or more, more preferably. May be greater than or equal to 0.15. In this case, the absolute value of the difference between the refractive indices of nY3 and nY4 and / or nZ3 and nZ4 may be less than 0.03.

More preferably, when the island-in-the-sea yarn is drawn in the x-axis direction, the absolute value of the difference between the refractive indices of nX3 and nX4 is 0.05 or more and the absolute value of the difference in the refractive indices of nY3 and nY4 and nZ3 and nZ4 is less than 0.03. It is advantageous to increase. In this case, nX3> nY3 = nZ3.

Regarding the shape of the birefringent island-in-the-sea yarn of the present invention, the cross-sectional view of the island-in-the-sea yarn may have any shape depending on the purpose, and may have various cross-sectional shapes of circular, oval, and polygonal shapes. Likewise, the cross section of the island portion of the islands of the islands may have a heterogeneous cross section such as a circle, an ellipse, or a polygon, regardless of the shape.

A plurality of islands of the island-in-the-sea yarn are disposed in the island-in-the-sea yarn, and an area ratio of the sea portion and the island portion may be 2: 8 to 8: 2. The thickness of the island-in-the-sea yarn may preferably be 0.3 to 20 denier. In addition, the refractive index of the sea portion may correspond to the refractive indices of the first support film 110 and the second support film 130 of the luminance-enhanced film in some cases.

Hereinafter, embodiments of the present invention will be described in detail.

Example  One

The first support film and the second support film were made of the same material, and a polyester resin mainly composed of 1,4-cyclohexanedicarboxylic acid and bisphenol-A [2,2-bis (4-hydroxy Phenyl) propane] was prepared by blending in a 1: 1 ratio. Seaweed yarn was used as the fabric of the reflective polarizing film, and the sea component of the seaweed yarn was made of polycarbonate (PC) made of isotropic material and polyethylene naphthalate (PEN) made of anisotropic material. . In addition, in the first support film, the lens shape was the same size, and the height H was 4 μm, and the diameter D was 50 μm to produce a brightness enhancement film.

Example  2

In the same manner as in Example 1, in the first support film, the lens shape was prepared with a luminance-enhanced film having a height (H) of 15 µm and a diameter (D) of 50 µm.

Example  3 and 4

In the same manner as in Examples 1 and 2, but to give a roughness to the second support film to produce a brightness-enhanced film.

Comparative example  One

In the same manner as in Example 1, the lens shape was formed into a hemispherical lens shape, the height H of the lens shape was 25㎛, the diameter (D) was 50㎛ to produce a luminance-enhanced film.

Comparative example  2

In the same manner as in Example 1, a luminance-enhanced film was prepared without imparting a lens shape to the first support film.

* Test Methods

1. Transmittance (TT) and haze (Haze): Measured by ASTM D1003 method using NIPPON DENSHOKU 300A analyzer.

2. Luminance: The manufactured film was mounted on the backlight unit (diffusion plate-diffusion film-prism film-brightness-enhanced film), and TOPCON BM-7 was installed under CCFL voltage of 16.5V and dimming value of 2.8V. Measure on stage.

Table 1 shows the results of testing optical characteristics such as transmittance for each of Examples and Comparative Examples.

division Transmittance (%) Haze (%) Luminance (cd / ㎡) Example 1 65 90.2 10150 Example 2 66 90.4 10080 Example 3 63 90.1 10060 Example 4 62 90.5 10030 Comparative Example 1 62 90.2 9710 Comparative Example 2 61 90.6 9970

Experimental results The luminance-enhanced film prepared in the Examples is further improved in brightness compared to the luminance-enhanced films prepared in Comparative Examples 1 and 2, about 2% compared to the luminance-enhanced film without the lens shape, the lens shape About 5% of the luminance was improved compared to the luminance-enhanced film.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be clear to those who have knowledge of.

1 illustrates the optical principle of a conventional brightness enhancement film.

2 and 3 show a cross-sectional view of the luminance-enhanced film according to an embodiment of the present invention.

Figure 4 shows the position of the lens shape in the brightness enhancement film according to an embodiment of the present invention.

Claims (13)

In the luminance optical film formed by sequentially laminating a first support film, a reflective polarizing film and a second support film, The first support film surface is made of a lens shape, the reflective polarizing film is made of a fabric, The ratio of the height (H) and the diameter (D) of the lens shape is an integrated luminance-enhanced film having a pattern, characterized in that 1.5: 20 to 6:20. The method of claim 1, Tangential angle (Q) with the surface in the lens shape is integral luminance-enhanced film with a pattern, characterized in that 120 to 165 °. The method according to claim 1 or 2, Integrated luminance-enhanced film with a pattern, characterized in that the illumination is given to the second support film. The method according to claim 1 or 2, The lens shape is in close contact with the same size and uniformly arranged, the diameter (D) of the lens shape is integral luminance-enhanced film with a pattern, characterized in that 30 to 60㎛. The method according to claim 1 or 2, The interval between the lens shape (L) is integral luminance-enhanced film with a pattern, characterized in that 0 to 60㎛. The method according to claim 1 or 2, The first support film and the second support film is isotropic, integral luminance-enhanced film having a pattern, characterized in that the polymer resin of the same material. The method according to claim 1 or 2, The first support film and the second support film are polyethylene naphthalate (PEN), copolyethylene naphthalate (co-PEN), polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PC) alloy, polystyrene (PS), heat-resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene (ABS), polyurethane ( PU), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polyamide (PA), polyacetal (POM), phenol, epoxy (EP ), Urea (UF), melanin (MF), unsaturated polyester (UP), silicone (SI), elastomer and cycloolefin polymer formed with a pattern, characterized in that it comprises one or more of the polyolefin polymer. The method according to claim 1 or 2, The refractive index of the first support film and the second support film is integral luminance-enhanced film having a pattern, characterized in that 1.4 to 2.0. The method according to claim 1 or 2, The fabric is integral luminance-enhanced film with a pattern, characterized in that consisting of islands. 10. The method of claim 9, The sea portion of the island-in-the-sea yarn is isotropic, and the island portion is anisotropic luminance-enhanced film with a pattern, characterized in that. 10. The method of claim 9, Examples of the island-in-the-sea material include polyethylene naphthalate (PEN), copolyethylene naphthalate (co-PEN), polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PC) alloy, polystyrene (PS), heat resistant Polystyrene (PS), Polymethyl methacrylate (PMMA), Polybutylene terephthalate (PBT), Polypropylene (PP), Polyethylene (PE), Acrylonitrile butadiene (ABS), Polyurethane (PU), Polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polyamide (PA), polyacetal (POM), phenol, epoxy (EP), urea (UF ), Melanin (MF), unsaturated polyester ester (UP), silicone (SI), elastomer and cycloolefin polymer formed with a pattern, characterized in that it comprises one or more of the polyolefin polymer. 10. The method of claim 9, The thickness of the island-in-the-sea yarn is integral luminance-enhanced film having a pattern, characterized in that 0.3 to 20 denier. 10. The method of claim 9, An integrated luminance-enhanced film having a pattern, wherein the refractive index of the sea portion of the island-in-the-sea yarn is the same as that of the first support film and the second support film.

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