KR20080092729A - Optical multi-layer film for multi-function using light diffusing agent - Google Patents

Optical multi-layer film for multi-function using light diffusing agent Download PDF

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Publication number
KR20080092729A
KR20080092729A KR1020070036480A KR20070036480A KR20080092729A KR 20080092729 A KR20080092729 A KR 20080092729A KR 1020070036480 A KR1020070036480 A KR 1020070036480A KR 20070036480 A KR20070036480 A KR 20070036480A KR 20080092729 A KR20080092729 A KR 20080092729A
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KR
South Korea
Prior art keywords
binder resin
light
light diffusing
prism
diffusing agent
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Application number
KR1020070036480A
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Korean (ko)
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KR100895335B1 (en
Inventor
김광원
김영진
김용성
박광배
박용완
최용준
Original Assignee
주식회사 상보
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Priority to KR1020070036480A priority Critical patent/KR100895335B1/en
Publication of KR20080092729A publication Critical patent/KR20080092729A/en
Application granted granted Critical
Publication of KR100895335B1 publication Critical patent/KR100895335B1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/02Diffusing elements; Afocal elements
    • G02B5/0205Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0226Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures having particles on the surface
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/02Diffusing elements; Afocal elements
    • G02B5/0205Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0231Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having microprismatic or micropyramidal shape
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/02Diffusing elements; Afocal elements
    • G02B5/0205Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/04Prisms
    • G02B5/045Prism arrays
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0035Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/00362-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/005Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051Diffusing sheet or layer
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/005Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053Prismatic sheet or layer; Brightness enhancement element, sheet or layer

Abstract

The present invention relates to an optical laminated film, and more particularly, the light condensing and light diffusion in the prism sheet can be improved so that the luminance in the multi-layer structure of the diffusion film, prism film, prism protection film currently being applied and the viewing angle can be compensated for. The present invention relates to an optical laminated film using a light diffusing agent, which is simultaneously realized and also prevents scratches from occurring on the contact surface of the optical sheet and the light guide plate and simultaneously prevents blocking.
The optical laminated film using the light diffusing agent according to the present invention is a light laminated on the base layer and the upper surface of the base layer and comprises a first binder resin and a plurality of light diffusing agents contained in the first binder resin A diffusion sheet including a diffusion layer and a coating layer stacked on a lower surface of the base layer and including a second binder resin and beads contained in the second binder resin, and stacked on an upper portion of the diffusion sheet, The prism portion is protruded, the surface of the prism portion comprises a prism sheet coated with a plurality of beads, characterized in that the light can be focused and diffused in the prism sheet.
In addition, the optical laminated film using the light diffusing agent according to the present invention comprises a base layer and a plurality of light diffusing agents laminated on the upper surface of the base layer and contained in the first binder resin and the first binder resin. A diffusion sheet having a light diffusing layer and a coating layer laminated on a lower surface of the base layer, the coating layer including a second binder resin and beads contained in the second binder resin, and laminated on an upper surface of the diffusion sheet. And a prism sheet having a plurality of prism portions formed therein and containing a plurality of beads therein, wherein light may be collected and diffused by the prism sheet, and the prism portion of the prism sheet may be coated with a plurality of beads. It is characterized by.

Description

Optical laminated film using light diffusing agent {OPTICAL MULTI-LAYER FILM FOR MULTI-FUNCTION USING LIGHT DIFFUSING AGENT}

1 is an exploded perspective view of a general backlight unit.

2a to 2c are schematic partial cross-sectional views of one embodiment of an optical laminated film using a light diffusing agent according to the present invention.

3a to 3c are schematic partial cross-sectional views of another embodiment of an optical laminated film using a light diffusing agent according to the present invention.

※ Explanation of code for main part of drawing

100: diffusion sheet 110: substrate layer

120: light diffusion layer 122, 132: binder resin

124: light diffusing agent 130: coating layer

134, 212, 214: Bead 200: Prism sheet

210: prism section

The present invention relates to an optical laminated film, and more particularly, condensing and light diffusion are simultaneously implemented in a prism sheet so that the luminance of the diffusion film, the prism film, and the prism protective film that are currently applied can be improved and the viewing angle can be compensated. In addition, the present invention relates to an optical laminated film using a light diffusing agent that can prevent scratches generated at the contact surface of the optical sheet and the light guide plate and at the same time prevent blocking.

The backlight unit emits light from the back of a liquid crystal display (LCD), and image information is made in the liquid crystal display by using white light supplied by the backlight unit.

The structure for a general backlight unit is shown in FIG. As shown in FIG. 1, the backlight unit includes a light source 4, a light guide plate 5 for guiding the light emitted from the light source 4 to a display unit (not shown), and the light guide plate 5. ) And an optical sheet (6, 7, 8) disposed between the display unit (not shown) to improve the efficiency of light emitted from the light guide plate (5), and the light generated from the light source is exposed to the outside The reflective plate 2, the light source reflecting plate 3, and the mold frame 1 are disposed on the lower portion of the light guide plate to be prevented, and the reflecting plate 2, the light source reflecting plate 3, and the light guide plate are formed on the mold frame 1. (5), the optical sheets 6, 7, 8 are sequentially stacked.

Looking at the optical sheet (6, 7, 8) in detail, the optical sheet (6, 7, 8) is formed by sequentially stacking the diffusion sheet (6), prism sheet (7) and protective sheet (8) As the diffusion sheet 6 scatters the light emitted from the light guide plate 5 and is incident on the display unit (not shown), the diffusion sheet 6 serves to uniform the luminance distribution of the light, and the prism sheet 7 has an upper portion. A prism having a triangular cross-sectional shape is repeatedly formed on the surface, and the light diffused by the diffusion sheet 6 is focused in a direction perpendicular to the plane of the display unit (not shown) to increase luminance. Accordingly, the light passing through the prism sheet 7 almost passes perpendicular to the plane of the display unit (not shown) to have a uniform luminance distribution. In addition, the protective sheet 8 is laminated on the prism sheet 7 to protect the surface of the prism sheet 7 and to uniformly distribute the light incident through the prism sheet 7. In order to diffuse the light.

However, although the optical sheets 6, 7, and 8 allow the light to be diffused by the light diffusing agent contained in the diffusion sheet 6, there is a problem that the light diffusion efficiency is not high, and the prism sheet 7 The focused light has a problem that the luminance is increased but the viewing angle is narrowed. In addition, there is a problem that scratches are generated due to friction between the contact surface of the diffusion sheet 6 and the light guide plate 5.

Accordingly, an object of the present invention is to provide an optical system using a light diffusing agent capable of simultaneously condensing and diffusing light in a prism sheet to improve luminance and compensate a viewing angle of a diffusion film, a prism film, and a prism protective film that are currently applied. In providing a laminated film.

In addition, an object of the present invention is to provide an optical laminated film using a light diffusing agent that can prevent the occurrence of scratches generated at the contact surface of the optical sheet and the light guide plate and at the same time prevent blocking.

The above object of the present invention,

A light diffusing layer laminated on a base layer and an upper surface of the base layer, the light diffusing layer comprising a first binder resin and a plurality of light diffusing agents contained in the first binder resin, and a second binder being laminated on a bottom surface of the base layer; A diffusion sheet including a coating layer comprising a resin contained in the resin and the second binder resin, and a plurality of prism portions protruded from one surface of the diffusion sheet, the surface of the prism portion being a plurality of beads. It is achieved by providing an optical laminated film using a light diffusing agent comprising a prism sheet to be coated, wherein the light can be focused and diffused in the prism sheet.

In addition, the above object of the present invention,

A light diffusing layer laminated on a base layer and an upper surface of the base layer and including a first binder resin and a plurality of light diffusing agents contained in the first binder resin, and a second binder being laminated on a bottom surface of the base layer; A diffusion sheet including a coating layer comprising a resin and a bead contained in the second binder resin, and a prism laminated on an upper portion of the diffusion sheet and having a plurality of prism portions protruding from one surface thereof and containing a plurality of beads therein. It is also achieved by providing an optical laminated film using a light diffusing agent comprising a sheet, characterized in that the light can be focused and diffused by the prism sheet, according to a preferred feature of the present invention, the prism of the prism sheet The swollen surface is coated with a plurality of beads.

According to a more preferred feature of the invention, the light diffusing agent has a specific gravity of 1.0 to 1.2 g / cm 3 and the coefficient of variation for the particle size is 15% or less, the light diffusing agent with respect to 100 parts by weight of the first binder resin 40 to 140 parts by weight.

According to a still further preferred feature of the invention, the second binder resin has a tensile modulus of 300 MPa or less, and the beads have a coefficient of friction of 0.36 (MIU) or less.

According to a still further preferred feature of the present invention, the beads consist of acrylic, nylon or silicone compounds.

According to a further preferred feature of the present invention, the second binder resin is made of any one of a UV curable binder resin including a UV curable urethane acrylic binder, a UV curable epoxy binder or silicone.

In addition, the above object of the present invention,

A prism sheet laminated on an upper surface of the substrate layer and having a plurality of prism portions protruded on one surface thereof, wherein a surface of the prism portion is coated with a plurality of beads; and a binder resin laminated on a lower surface of the substrate layer. It is also achieved by providing an optical laminated film using a light diffusing agent comprising a coating layer comprising a bead contained in the binder resin, the light can be focused and diffused by the prism sheet, According to a preferred feature of the invention, the antistatic agent is added to the inside of the binder resin to prevent static electricity.

In addition, the above object of the present invention,

A prism sheet including a base layer, a top surface of the base layer, a plurality of prism portions protruding from one surface, and containing a plurality of beads therein; and a bottom surface of the base layer, the binder resin and the binder resin It is also achieved by providing an optical laminated film using a light diffusing agent, characterized in that the coating layer is provided with a bead contained therein, characterized in that the light can be focused and diffused by the prism sheet, preferred of the present invention According to a feature, the prism portion of the prism sheet is coated with a plurality of beads on the surface, and an antistatic agent is added to the inside of the binder resin to prevent static electricity.

According to a further preferred feature of the invention, the binder resin has a tensile modulus of 300 MPa or less, and the beads have a coefficient of friction of 0.36 (MIU) or less.

According to a still further preferred feature of the present invention, the beads consist of acrylic, nylon or silicone compounds.

According to a further preferred feature of the invention, the binder resin is made of any one of a UV curable binder resin including a UV curable urethane acrylic binder, a UV curable epoxy binder or silicone.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, this is only to describe in detail enough to be able to easily carry out the invention by those skilled in the art, which does not mean that the technical spirit and scope of the present invention is limited.

2A to 2C are schematic partial cross-sectional views of one embodiment of an optical laminated film using a light diffusing agent according to the present invention. As shown in FIGS. 2A to 2C, the optical laminated film using the light diffusing agent includes a diffusion sheet 100 and a prism sheet 200.

The diffusion sheet 100 is stacked on top of the light guide plate (not shown) of the backlight unit to scatter or refract light incident from the light guide plate to spread the light evenly on the entire LCD screen. As shown in FIG. 2C, the light diffusing layer 120 stacked on the top surface of the base layer 110 and the base layer 110 and the coating layer 130 stacked on the bottom surface of the base layer 110 are provided.

The base layer 110 is a transparent sheet through which light can be transmitted. In general, polyethersulphone (PES), polyacrylate (PAR), polyetherimide (PEI), and polyethylene naphthalate (polyethyelenen napthalate; PEN) polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyallylate, polyimide, polycarbonate (PC), cellulose triacetate (TAC) ), Cellulose acetate propionate (CAP) may include at least one, and particularly preferably made of polyethylene terephthalate (PET). The base layer 110 should be excellent in adhesion with the following first binder resin 122, the transmittance of light incident from the rear surface should be 90% or more, and the smoothness of the surface should be uniform so that there is no variation in luminance. In addition, the thickness of the base layer 110 is preferably 50 to 250㎛, if less than 50㎛ handleability in the manufacturing process, if it exceeds 250㎛ has a structure contrary to the recent trend of thinning of the LCD module.

The light diffusing layer 120 is stacked on an upper surface of the base layer 110 and includes a first binder resin 122 and a light diffusing agent 124 contained in the first binder resin 122. .

The light diffusing agent 124 is to be diffused by scattering light passing through the base layer 110, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, normal butyl methacrylate, normal butyl After forming the acrylate-based particles such as acrylic, polyethylene, polystyrene, polypropylene, such as methyl methacrylate, acrylic acid, methacrylic acid, copolymer or terpolymer, particles of acryl and olefin-based copolymer, homopolymer, Organic particles such as multi-layered multicomponent particles coated with different types of monomers on the layer may be used, preferably polymethyl methacrylate (PMMA) may be used, and such a light diffusing agent 124 may be used as a first binder. It is contained in a plurality of resins 122, the light can be spread evenly across the surface.

The light diffusing agent 124 has a specific gravity of 1.0 to 1.2 g / cm 3 and a coefficient of variation for particle size is preferably 15% or less, which is to maximize the light diffusion effect. Here, the coefficient of variation is defined as 'variation coefficient = (standard deviation ÷ mean) × 100', and in general, although the standard deviation is used as a method of expressing the scatter diagram, in the present invention, the mean value is compared with the mean value rather than the standard deviation. Regardless, the distribution coefficient of light diffuser can be controlled and the coefficient of variation can be applied to the process. As can be seen from the definition, the coefficient of variation means that the closer the value is to '0', the smaller the variation between particles is. When the coefficient of variation of the light diffusing agent 124 exceeds 15%, even if the thickness of the light diffusing layer 120 is coated to be the same as the thickness of the light diffusing agent 124 in the coating process of the initial light diffusing layer 120 Due to the large particle size distribution between the agents 124, the light diffusing agent 124 particles may be laminated in multiple layers instead of a single layer, thereby reducing the light diffusion effect. 2A to 2C, although the light diffusing agent 124 having the same size is coated in a single layer inside the first binder resin 122, the present invention is not limited thereto. The light diffusing agent 124 containing the large size 124 is coated with a single layer, and the light diffusing agent 124 having a small size is filled in the space therebetween, thereby maximizing the light diffusion effect. In addition, the specific gravity of the light diffusing agent 124 is a matter to be considered in relation to the specific gravity of the solvent used. If the specific gravity is less than 1.0 g / cm 3, the specific gravity may be smaller than that of the solvent which can be used, resulting in poor dispersibility. It is difficult to manage the thickness distribution of the coating in the production process, and if it exceeds 1.2g / cm 3, since the sedimentation rate in the solvent is large, a process loss of frequent re-stirring in the coating process may occur, thus causing 1.0 to 1.2 g. In the case of having a specific gravity of / cm 3, the above problem can be solved.

The first binder resin 122 has a light transmittance and a light diffusing rate varying according to a ratio of the light diffusing agent 124 contained therein, and a light diffusing agent contained in the resin in order to show a high light transmittance and a light diffusing rate ( 124) is preferably 40 to 140 parts by weight based on 100 parts by weight of the first binder resin 122. When the content is less than 40 parts by weight, light diffusing effect due to scattering is insufficient. Because it can fall. On the other hand, the first binder resin 122 is advantageous when the adhesion to the substrate layer 110 of the diffusion sheet 100 is advantageous, and must be compatible with the light diffusing agent 124 used, the first A curing agent may be added to the binder resin 122 in order to improve physical properties, that is, heat resistance, wear resistance, and adhesiveness.

The coating layer 130 is stacked on the lower surface of the base layer 110 to prevent scratches, the second binder resin 132 and the beads contained in the second binder resin 132 ( 134).

The second binder resin 132 preferably has a tensile modulus of 300 MPa or less, which is to prevent scratches caused by friction with the light guide plate (not shown). When the tensile modulus of elasticity of the second binder resin 132 is 300 MPa or less, the elastic modulus of the acrylic resin laminated on the conventional light guide plate may be smaller than 900 to 1000 MPa, which may prevent scratching, and scratches of the coating layer and scratches of the light guide plate may be prevented. Occurrence can be prevented at the same time. The second binder resin 132 is not particularly limited as long as the material has a tensile modulus of 300 MPa or less, but is preferably any one of a UV curable urethane acrylic binder, a UV curable epoxy binder, and a UV curable binder resin including silicone. (2-acryloxyethyl) isocyanurate-2-propenoic acid (Tris (2-acryloxyethyl) isocyanurate-2-Propenoic acid), (1-methylethylidene) bis (4,1-phenyleneoxy (1-methlyethyliden) bis (4,1-phenyleneoxy-2,1-ethanediyloxy-2,1-ethanediyl) ester and 1-hydroxy More preferred are terpolymers of 1-hydroxy-cyclohexyl-phenyl ketone. The terpolymer may be a block copolymer or a random copolymer, and has a glass transition temperature (Tg) of about 52 ° C. and a number average molecular weight of about 4500.

The bead 134 is contained in the second binder resin 132 and serves to diffuse light passing through the coating layer 130. The bead 134 is preferably contained to protrude out of the second binder resin 132 so that the anti-blocking property is imparted to the coating layer 130. Here, blocking generally refers to a phenomenon in which inner surfaces of the films stick to each other, and blocking occurs between the light guide plate (not shown) and the coating layer 130 of the diffusion sheet 110 stacked on the upper surface of the light guide plate, and the blocking operation is performed. Not only does the image interfere, but the interference pattern is generated due to the adhesion between the coating layer 130 of the diffusion sheet 110 and the light guide plate. Therefore, when a part of the bead 134 protrudes to the outside, the blocking phenomenon may be prevented, and the bead 134 may protrude from 3 to 5 μm from the surface of the coating layer 220. As the bead 134 protrudes as described above, blocking may be prevented because the contact area between the diffusion sheet 110 and the light guide plate may be reduced to minimize contact with the light guide plate. Therefore, in addition to the effect of diffusing light by the bead 134, it is possible to obtain an effect of preventing blocking.

In addition, the friction coefficient of the bead 134 needs to be small, but preferably has a friction coefficient of 0.36 (MIU) or less. The (MIU) is a unit value of the mean value of coefficient of friction (non-unit) by KES measurement. This is to prevent the bead 134 is in contact with the light guide plate, the friction occurs and the scratch generated by the friction. Typically, the group used in the light guide plate is an acrylic resin, and the acrylic resin has a coefficient of friction of 0.37 to 0.38. If the friction coefficient of the bead 134 is 0.36 (MIU) or less, scratching of the light guide plate may be prevented.

In addition, the bead 134 is preferably made of an acrylic, nylon or silicon-based compound, the friction coefficient is less than 0.36 (MIU) material of methyl silicone powder (Methyl silicone powder) or nylon powder (Nylon powder, for example, Nylon-12) and the like can be used, but is not limited thereto. In the case of the methylsilicone powder or nylon powder, since the elasticity is itself, the scratch of the bead 134 itself due to friction with the light guide plate may be prevented.

The prism sheet 200 is stacked on the diffusion sheet 100 to condense the light passing through the diffusion sheet 100 to increase the brightness of the light. A plurality of prism portions 210 protrude from one surface of the prism sheet 200, and the light diffused by the diffusion sheet 100 is collected so that the prism portion 210 may emit light in a direction perpendicular to the LCD screen. Is emitted. Here, although the prism portion 210 having a triangular cross section is shown in FIGS. 2A to 2C, it may be formed in various shapes such as a spherical shape or a lens shape.

In the prism sheet 200, as shown in FIG. 2A, the surface of the prism portion 210 is coated with a plurality of beads 212, and the light focused by the prism sheet 200 receives the prism portion 210. By being diffusely reflected by the beads 212 at the surface of), the condensing and diffusing of the light can be simultaneously realized so that the viewing angle can be compensated. On the other hand, since the bead 212 is coated on the entire surface of the prism sheet 200, the prism portion 210 can be protected, and in this case, a protective sheet conventionally used is unnecessary.

In addition, the prism sheet 200 includes a plurality of beads 214 therein, as shown in FIG. 2B. This is to allow the light to be diffused by the beads 214 as the light converges to the prism portion 210 of the prism sheet 200 so that the light is more uniformly distributed. Because it is diffusely reflected and diffused by), condensing and diffusion occur simultaneously. 2 illustrates that one of the plurality of prism portions 210 contains one bead 214 at the lower portion of each prism portion 210, but is not limited thereto, and the plurality of beads 214 may be regularly or irregularly. It may be contained, and the content of the bead 214 may be appropriately adjusted to adjust the brightness and viewing angle.

In addition, the prism sheet 200, as shown in Figure 2c, not only contains a plurality of beads 214 therein, the surface of the prism portion 210 may be coated with beads 212, In this way, the prism sheet 200 itself can obtain a diffusion effect maximized at the same time as the light condensing, and a sufficient viewing angle can be secured.

Referring to the process of transmitting light through the optical laminated film using the light diffusing agent of Figure 2a to 2c as follows. First, light emitted from a light source (not shown) and guided by a light guide plate (not shown) is diffusely reflected by the beads 134 while passing through the coating layer 130, and the diffused light is transferred to the transparent base layer 110. Will pass. Then, the light passing through the base layer 110 is diffused by the light diffusing agent 124 while passing through the light diffusing layer 120 and condensed on the prism sheet 200 with a uniform distribution. The light condensed by the prism sheet 200 and the brightness is increased is re-diffused again by the beads 214 contained in the prism sheet 200 or the beads 212 on the surface of the prism sheet 200. Therefore, the light is incident on the entire LCD screen (not shown) due to condensing and diffusing in the prism sheet 200, thereby illuminating the entire screen.

3A to 3C are schematic partial cross-sectional views of another embodiment of an optical laminated film using a light diffusing agent according to the present invention. As shown in FIGS. 3A and 3B, the optical laminated film using the light diffusing agent includes a substrate layer 110, a prism sheet 200, and a coating layer 130. The substrate layer 110, the prism sheet 200, and the coating layer 130 of the optical laminated film using the light diffusing agent shown in FIGS. 3A to 3C are one of the optical laminated films using the light diffusing agent according to the present invention. The technical features are the same as in the embodiment. That is, in the optical laminated film using the light diffusing agent of FIGS. 3A to 3C, the light diffusing layer 120 containing the light diffusing agent 122 is excluded from the optical laminated film using the light diffusing agent of FIGS. 2A to 2C. will be. The light diffusion layer 120 is removed in order to implement a slimming of the backlight unit. Even without the light diffusion layer 120, the beads 134 of the coating layer 130 stacked on the bottom surface of the base layer 110 and Sufficient light diffusion effect may be obtained due to the beads 214 contained in the prism sheet 200 or the beads 212 coated on the prism portion 210.

On the other hand, between the upper surface of the coating layer 130 and the lower surface of the base layer 110 is preferably formed an air layer to some extent so that light can be efficiently refracted and transmitted, the substrate is usually formed of film paper The layer 110 and the coating layer 130 may be in close contact with each other due to static electricity, so that the occurrence of static electricity may be prevented inside the binder resin 132 of the coating layer 130 to prevent such a phenomenon. It is preferred that any antistatic agent is added. The antistatic agent is not particularly limited, and products commonly used in the art may be used, and the antistatic agent may also function to prevent contamination by dust or impurities that may occur during manufacture of the backlight unit.

Other technical features of the binder resin 132 and the bead 134 are the same as in the embodiment of the optical laminated film using the light diffusing agent according to the present invention described above will be omitted.

The process of transmitting light through the optical sheet of FIGS. 3A and 3B is as follows. First, light emitted from a light source (not shown) and guided by a light guide plate (not shown) is diffusely reflected by the beads 134 inside the coating layer 130 while passing through the coating layer 130. Incident on the substrate layer 110 in a uniform distribution. Then, the light passing through the base layer 110 is directly focused on the prism sheet 200. Light condensed by the prism sheet 200 and the brightness is increased is again diffused by the beads 214 inside the prism sheet 200 or the beads 212 on the surface of the prism sheet 200. Therefore, the light is incident on the entire LCD screen (not shown) due to condensing and diffusing in the prism sheet 200, thereby illuminating the entire screen.

As described above, according to the optical laminated film using the light diffusing agent according to the present invention, the bead is contained or the surface of the prism sheet is coated with beads so as to diffuse the light inside the prism sheet, the light in the prism sheet At the same time that the light is focused, a sufficient viewing angle of light diffused through the prism sheet can be secured.

In addition, since the prism sheet can be protected by the bead contained inside the prism sheet or the surface is coated with the bead, a separate prism protection sheet is not required, thereby reducing the number of parts and the thickness of the optical sheet, resulting in slim backlight unit. Can be.

In addition, since a sufficient light diffusing effect can be obtained by the beads contained in the inside of the prism sheet or coated on the surface, it is possible to remove the light diffusing layer that has been used previously, so that the backlight unit can be made slimmer.

Claims (15)

  1. A light diffusion layer comprising a substrate layer, a light diffusion layer stacked on an upper surface of the substrate layer and including a first binder resin and a plurality of light diffusing agents contained in the first binder resin, and laminated on a lower surface of the substrate layer. A diffusion sheet having a coating layer comprising a second binder resin and beads contained in the second binder resin; And
    And a prism sheet laminated on the diffusion sheet and having a plurality of prism portions protruding from one surface thereof, wherein a surface of the prism portion is coated with a plurality of beads, wherein light may be collected and diffused in the prism sheet. Optical laminated | multilayer film using the light diffusing agent characterized by the above-mentioned.
  2. A light diffusion layer comprising a substrate layer, a light diffusion layer stacked on an upper surface of the substrate layer and including a first binder resin and a plurality of light diffusing agents contained in the first binder resin, and laminated on a lower surface of the substrate layer. A diffusion sheet having a coating layer comprising a second binder resin and beads contained in the second binder resin; And
    And a prism sheet laminated on the diffusion sheet, and having a plurality of prism portions formed on one surface thereof and containing a plurality of beads therein, wherein the light can be focused and diffused by the prism sheet. Optical laminated film using a light diffusing agent.
  3. The method of claim 2,
    The prism portion of the prism sheet is an optical laminated film using a light diffusing agent, characterized in that the surface is coated with a plurality of beads.
  4. The method according to any one of claims 1 to 3,
    The light diffusing agent has a specific gravity of 1.0 to 1.2 g / cm 3 and the coefficient of variation for the particle size of the optical laminated film using a light diffusing agent, characterized in that not more than 15%.
  5. The method of claim 4, wherein
    The light diffusing agent is an optical laminated film using a light diffusing agent, characterized in that 40 to 140 parts by weight based on 100 parts by weight of the first binder resin.
  6. The method according to any one of claims 1 to 3,
    The second binder resin has a tensile modulus of 300 MPa or less, and the beads have a coefficient of friction of 0.36 (MIU) or less, and the optical laminated film using the light diffusing agent.
  7. The method of claim 6,
    The bead is an optical laminated film using a light diffusing agent, characterized in that the acrylic, nylon or silicon-based compound.
  8. The method of claim 6,
    The second binder resin is an UV curable urethane acrylic binder, an UV curable epoxy binder, or any one of a UV curable binder resin including silicone, an optical laminated film using a light diffusing agent.
  9. Base layer;
    A prism sheet laminated on an upper surface of the substrate layer, the prism portion protruding from one surface thereof, and the prism sheet being coated with a plurality of beads; And
    It is laminated on the lower surface of the base layer, the coating layer is provided with a binder resin and the bead contained in the binder resin; including; light diffusion characterized in that the light can be focused and diffused by the prism sheet Optical laminated film using the agent.
  10. Base layer;
    A prism sheet laminated on an upper surface of the substrate layer, the prism portion protruding from one surface thereof, and containing a plurality of beads therein;
    It is laminated on the lower surface of the base layer, the coating layer is provided with a binder resin and the bead contained in the binder resin; including; light diffusion characterized in that the light can be focused and diffused by the prism sheet Optical laminated film using the agent.
  11. The method of claim 10,
    The prism portion of the prism sheet is an optical laminated film using a light diffusing agent, characterized in that the surface is coated with a plurality of beads.
  12. The method according to any one of claims 9 to 11,
    An optical laminated film using a light diffusing agent, characterized in that an antistatic agent is added to the inside of the binder resin to prevent static electricity.
  13. The method of claim 12,
    The binder resin has a tensile modulus of 300 MPa or less, and the beads have a coefficient of friction of 0.36 (MIU) or less, and the optical laminated film using the light diffusing agent.
  14. The method of claim 12,
    The bead is an optical laminated film using a light diffusing agent, characterized in that the acrylic, nylon or silicon-based compound.
  15. The method of claim 12,
    The binder resin is a UV curable urethane acrylic binder, a UV curable epoxy binder, or an optical laminated film using a light diffusing agent, characterized in that any one of a UV curable binder resin containing silicone.
KR1020070036480A 2007-04-13 2007-04-13 Optical multi-layer film for multi-function using light diffusing agent KR100895335B1 (en)

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KR1020070036480A KR100895335B1 (en) 2007-04-13 2007-04-13 Optical multi-layer film for multi-function using light diffusing agent
TW096128523A TWI372286B (en) 2007-04-13 2007-08-03 Multifunctional optical multilayer film using light diffusers
JP2007208555A JP2008262147A (en) 2007-04-13 2007-08-09 Optical laminated film using light diffusing agent
CN2007101404661A CN101285961B (en) 2007-04-13 2007-08-14 Multifunctional optical multilayer film using optical diffuser

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CN101285961A (en) 2008-10-15
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CN101285961B (en) 2011-11-16
KR100895335B1 (en) 2009-05-07
TWI372286B (en) 2012-09-11

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