WO2009088247A2 - 광학 시트 - Google Patents
광학 시트 Download PDFInfo
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- WO2009088247A2 WO2009088247A2 PCT/KR2009/000119 KR2009000119W WO2009088247A2 WO 2009088247 A2 WO2009088247 A2 WO 2009088247A2 KR 2009000119 W KR2009000119 W KR 2009000119W WO 2009088247 A2 WO2009088247 A2 WO 2009088247A2
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- optical sheet
- layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing 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
- G02B5/0231—Diffusing 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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
- G02B5/045—Prism arrays
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/0005—Production of optical devices or components in so far as characterised by the lithographic processes or materials used therefor
- G03F7/0007—Filters, e.g. additive colour filters; Components for display devices
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/0047—Photosensitive materials characterised by additives for obtaining a metallic or ceramic pattern, e.g. by firing
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
- G03F7/032—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders
- G03F7/035—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders the binders being polyurethanes
Definitions
- the present invention relates to an optical sheet, and more particularly to an optical sheet having a surface structured by an optical solid pattern such as a prism sheet or the like.
- LCD which is used as an optical display element, is an indirect light emission method that displays an image by controlling transmittance of an external light source, and a backlight unit, which is a light source device, is used as an important component for determining the characteristics of an LCD.
- LCD Since LCD has a structure in which light passing through the light diffusion layer is diffused in all directions, the light emitted to the front becomes very insufficient, and thus, efforts to express higher luminance with less power consumption continue. In addition, as the display becomes larger, efforts are being made to widen the viewing angle so that more users can view it.
- the typical optical sheet has a prism array on the surface.
- an optical sheet having a prism array has a triangular array structure having an inclined surface of 45 ° to improve luminance in the front direction.
- the optical structure surface is in the shape of a mountain, the upper part of the mountain is easily broken or distorted due to small external scratches, thereby causing damage to the prism structure.
- the angles emitted by the same type of prism structure are the same for each array, the luminance decreases due to the difference in the light paths emitted between the damaged part and the normal part even by small crushing of the mountain or minute scratches on the inclined surface in the prism array. And failure occurs. Therefore, even in the case of the production of the prism sheet, even in the case of minute defects, the front surface of the produced prism sheet may not be used depending on the position. This leads to a decrease in productivity, which in turn is a burden of cost increase. In fact, even in the assembling of the backlight module, defects due to damage to the prism structure due to scratches when handling the prism sheet become a significant problem.
- a plurality of sheets and films are laminated, and in order to increase the brightness, a plurality of prism films may be mounted.
- the upper prism film and the upper prism film may be in contact with each other. Due to this there was a problem that the prism structure is damaged.
- a general backlight unit uses a light source such as a Cold Cathode Fluorescent Lamp (CCFL) to sequentially pass light emitted through a light diffusing member such as a light guide plate, a light diffusion sheet or a light diffusion plate, and a prism sheet.
- a light diffusing member such as a light guide plate, a light diffusion sheet or a light diffusion plate, and a prism sheet.
- the light guide plate transmits the light emitted from the light source to be distributed over the entire surface of the liquid crystal panel having a flat shape
- the light diffusing member obtains uniform light intensity over the entire screen
- the prism sheet passes through the light diffusing member.
- a light path control function is performed so that the light beam in the direction is converted into a range of viewing angle ⁇ suitable for the viewer to recognize the image.
- the lower portion of the light guide plate is provided with a reflective sheet for increasing the efficiency of use of the light source by being able to be reflected back to the light that is not delivered to the liquid crystal panel
- a plurality of sheets having various functions are mounted.
- a plurality of sheets causes the optical interference to occur, and the film is damaged due to physical contact between the sheets.
- an optical sheet having a structured surface that is not damaged by a force or a rough surface applied from a certain outside when applied to a display.
- an optical sheet having a structured surface that can be easily prevented damage to the structured surface is easy to handle.
- an optical sheet capable of preventing a decrease in luminance due to light path difference is provided.
- the present invention is equivalent to that obtained by mounting a conventional light diffusing member and prism sheet, having a structured surface that is intact against forces or rough surfaces applied from a certain external force when applied to a display. It is an object of the present invention to provide an optical sheet capable of obtaining the above luminance and reducing the number of mounting sheets.
- an embodiment of the present invention is to provide a composite optical sheet having a structured surface that can easily prevent damage to the structured surface is easy to handle.
- an embodiment of the present invention is to provide a composite optical sheet that can reduce the production rate while reducing the production cost and increase the production efficiency.
- an embodiment of the present invention is to provide a compounded optical sheet that can provide a suitable hiding.
- One exemplary embodiment of the present invention is to provide an optical sheet assembly that can reduce the number of optical sheets to be mounted, without requiring the lamination of the protective film.
- the optical sheet made of a curable resin and having a structured surface formed with a plurality of optical three-dimensional pattern, it provides an optical sheet characterized in that the damage load is defined as 20g or more as follows. .
- Damage-resistant load On the structured surface, a coating layer of polyethylene terephthalate film comprising a coating layer containing particles having a surface roughness (Sz) of 0.5 ⁇ m to 15 ⁇ m and a hardness of 2B to 2H is laminated adjacently, and a polyethylene terephthalate film Maximum load at the point where substantially no damage occurs when the optical sheet is pulled at a speed of 300 mm / min and a structured surface is observed under constant load on the phase.
- Sz surface roughness
- the base layer A light diffusion layer formed on at least one surface of the substrate layer and including a binder resin and light diffusing particles; An air layer formed on the light diffusion layer and including a binder resin and foam beads; And a light collecting layer formed on the air layer, made of a curable resin containing or without foamable beads, and having a plurality of optical solid patterns formed thereon to have a structured surface.
- Optical sheet according to an embodiment of the present invention is a substrate layer; A light diffusion layer formed on at least one surface of the substrate layer and including a binder resin and light diffusing particles; And a light condensing layer formed on the light diffusing layer, the curable resin including foamed beads, and having a structured surface formed with a plurality of optical three-dimensional patterns.
- Optical sheet according to an embodiment of the present invention is a substrate layer; A light diffusion layer formed on at least one surface of the substrate layer and including a binder resin and light diffusing particles; And a light collecting layer formed on the light diffusion layer, made of a curable resin, and having a structured surface by forming a plurality of optical three-dimensional patterns.
- Optical sheet according to an embodiment of the present invention is a substrate layer; A particle dispersing layer formed on one surface of the substrate layer and including a binder resin and light diffusing particles; And a light collecting layer formed on the other side of the base layer, made of a curable resin, and having a structured surface by forming a plurality of optical three-dimensional patterns.
- Optical sheet according to an embodiment of the present invention is a substrate layer; A light diffusion layer formed on at least one surface of the substrate layer and including a binder resin, light diffusing particles, and foam beads; And a light collecting layer formed on the light diffusion layer, made of a curable resin, and having a structured surface by forming a plurality of optical three-dimensional patterns.
- the base layer ; And a curable resin formed on at least one surface of the substrate layer, the curable resin including foamed beads and light diffusing particles, and a plurality of optical steric patterns formed thereon to include a light collecting layer having a structured surface.
- the optical sheet according to the embodiment of the present invention may have a damage load of 30 g or more, and preferably, a damage load of 30 g to 500 g.
- the curable resin is at least one compound selected from urethane acrylate compound, styrene compound, butadiene compound, isoprene monomer and silicone acrylate compound, or selected from bisphenol acrylate compound and fluorene acrylate compound Any one or more ultraviolet curable oligomers or ultraviolet curable monomers selected from mixtures with at least one compound; And it may be formed from a curable composition comprising a photoinitiator.
- the curable resin may be formed from a curable composition comprising a urethane acrylate compound and a bisphenol acrylate compound as an ultraviolet curable oligomer or an ultraviolet curable monomer.
- the curable resin may be formed from a curable composition comprising a urethane acrylate compound to 10 to 80 parts by weight based on 100 parts by weight of the total solids, and the curable resin is a bisphenol acrylate compound to 100 parts by weight of the total solids It may be formed from a curable composition comprising 5 to 80 parts by weight relative to.
- the curable resin may be formed from a curable composition that is 100 to 5,000cps when the viscosity is 25 °C.
- the curable resin may have a glass transition temperature of 40 ° C. or less, and preferably the curable resin may have a glass transition temperature of ⁇ 15 to 25 ° C.
- the optical three-dimensional pattern is a polygonal, semi-circular or semi-elliptic polyhedron cross section; Columnar shape having a polygonal, semi-circular or semi-elliptic cross section; And a curved column shape having a polygonal, semi-circular or semi-elliptic cross section.
- the optical three-dimensional pattern may have a columnar shape having a triangle having a vertex angle of 90 °.
- Optical sheet according to an embodiment of the present invention can prevent damage to the structured surface even when a certain load is applied from the outside when applied to the display, there is an effect that is easy to handle.
- the optical sheet according to the embodiment of the present invention can prevent the luminance decrease due to damage, and thus has the effect of maintaining the function unique to the optical sheet imparted at the time of manufacture.
- the film is not easily damaged by the film lamination or external impact during the manufacturing process, the defect occurrence rate is reduced, thereby reducing the production cost and increasing the production efficiency.
- the structured surface may be prevented from being damaged, and thus the light may be easily handled. Not only does it provide the ability to improve brightness while simultaneously spreading, it can also provide excellent concealability.
- the optical sheet according to the embodiment of the present invention can provide a composite optical sheet that can prevent the loss of light and damage to the sheet, such as light interference phenomenon, scattering or absorption caused by stacking a plurality of sheets. have.
- FIG. 1 is a cross-sectional view of an optical sheet according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view of an optical sheet according to another embodiment of the present invention.
- FIG. 3 is a cross-sectional view of an optical sheet according to another embodiment of the present invention.
- FIG. 4 is a cross-sectional view of an optical sheet according to another embodiment of the present invention.
- FIG. 5 is a cross-sectional view of an optical sheet according to another embodiment of the present invention.
- FIG. 6 is a cross-sectional view of an optical sheet according to another embodiment of the present invention.
- FIG. 7 is a cross-sectional view of an optical sheet according to another embodiment of the present invention.
- the optical sheet is not particularly limited, but may be an optical sheet having a predetermined surface, that is, an optical sheet having a structured surface formed by forming an optical three-dimensional pattern, It may be a single layer or a multilayer, and may also be an optical sheet composited with other functional layers.
- the structured surface may be formed of a curable resin obtained by extruding, stamping, or by curing a separate curable composition in a predetermined pattern, but is not limited thereto.
- the upper part of the optical sheet is pointed in the shape of a mountain, and thus can be easily damaged by force applied from the outside or protruding particles.
- the optical sheet according to the embodiment of the present invention preferably has a damage load of 20 g or more.
- the term 'damage-resistant load' means to adjoin the coating layer of the polyethylene terephthalate film including a coating layer containing particles having a surface roughness (Sz) of 0.5 ⁇ m to 15 ⁇ m and a hardness of 2B to 2H on the structured surface.
- the definition of 'substantially no damage' will be understood to the extent that scratches do not occur during visual observation, as well as the crack or height change of the three-dimensional structure does not occur even when observed by SEM.
- the magnification in the observation by SEM may be about X50 to X500.
- the polyethylene terephthalate film including a coating layer containing particles having a surface roughness (Sz) of 0.5 ⁇ m to 15 ⁇ m and a hardness of 2B to 2H used for the evaluation of damage load is used to impart light diffusion to a polyethylene terephthalate substrate.
- a film containing a particle dispersion layer commercially available examples of such a film include Kolon's LD10, LD14, LD34, and the like.
- the particle dispersion layer may be formed from a crude liquid containing light diffusing particles in the binder resin.
- the surface roughness was evaluated by the method using Sz, the average surface roughness value of 10 points of the maximum height of 5 points and the minimum height of 5 points, respectively, at a magnification of X500 using a laser microscope, and the hardness was measured by the pencil hardness method (ASTM 3363 method). It may be measured by.
- Optical sheet according to an embodiment of the present invention is 20 g or more, preferably 30 g or more, more preferably 30 g to 500 g, the damage load is defined in this way, if the damage load is less than 20 g or in contact with other films When under load, cracks or distortions may occur on the structured surface, which may prevent it from functioning as an optical sheet.
- the composition of the elastomer as compared to the tendency of the rubber in the composition for forming an optical sheet material having a structured surface or a separate layer including the structured surface of the optical sheet
- the method of using the material which shows a lot of inclinations but does not inhibit an optical characteristic is mentioned. That is, the method of using the material by which toughness and elasticity were adjusted suitably is mentioned.
- urethane acrylate-based compounds, styrene-based compounds, butadiene-based compounds, isoprene monomers or silicone acrylate-based compounds can be considered as a structured surface forming material, and in terms of toughness, bisphenol acrylate-based compounds or flu It may be advantageous to further include an orene acrylate compound.
- the curable monomer or oligomer included in the structured surface forming material is not limited thereto.
- the curable composition containing a urethane acrylate type compound and a bisphenol acrylate type compound as an ultraviolet curable oligomer and a monomer is mentioned.
- the urethane acrylate compound may impart elasticity to the optical three-dimensional pattern, and the content thereof may be preferably 10 to 80 parts by weight based on 100 parts by weight of the total solids of the composition in terms of imparting proper elasticity.
- the bisphenol acrylate-based compound is a component for improving the toughness, its content may be preferable in terms of imparting proper toughness without impairing elasticity of 5 to 80 parts by weight based on 100 parts by weight of the total solid content of the composition. .
- bisphenol acrylate compound examples include bisphenol A acrylate compounds, bisphenol F acrylate compounds, bisphenol S acrylate compounds, and the like, preferably bisphenol A acrylate compounds. Can be.
- the curable composition may be 100 to 5,000 cps when the viscosity is 25 °C for the process of the optical three-dimensional pattern formation.
- the structured surface formed by the optical three-dimensional pattern which is more advantageous in terms of toughness or reduction of adhesion staining, includes such a structural layer forming material and has a glass transition temperature of 40 ° C. or lower when forming a cured film. It may be formed from a composition.
- the crude liquid has a glass transition temperature higher than 40 ° C. at the time of forming the cured film, the layer including the structured surface loses elasticity and may cause damage to the surface. More preferably, the glass transition temperature is -15 to 25 °C.
- the optical sheet according to an embodiment of the present invention has a structured surface formed by a plurality of optical three-dimensional pattern
- the optical three-dimensional pattern may be a polygonal, semi-circular or semi-elliptic polyhedron cross section, or It may have a columnar pattern that is polygonal, semi-circular or semi-elliptic, or may be curved columnar in cross-section. It may also be a shape in which one or more of these patterns are mixed.
- It also includes a case having a structure arranged in at least one concentric shape when viewed in plan view, and has a structure in which mountains and valleys are formed along the concentric circles.
- the characteristics of the brightness and the wide viewing angle vary greatly according to the angle of the vertex, and it may be advantageous that the angle of the vertex is 80 to 100 ° in consideration of the brightness and the wide viewing angle due to condensing. It may be more advantageous to be 85-95 °.
- the method for manufacturing the optical sheet according to the embodiment of the present invention is not particularly limited, and for example, an additive, such as an ultraviolet curing agent and a photoinitiator, is added to the ultraviolet curing oligomer or the ultraviolet curing monomer to prepare an ultraviolet curing liquid composition.
- An optical sheet can be manufactured by coating and hardening this on a base material layer, and can also manufacture through extrusion or stamping method.
- an optical three-dimensional pattern that satisfies the above-described damage resistance characteristics is formed, and a separate layer having a structured surface (hereinafter, referred to as a light collecting layer) and a layer expressing different functions are combined.
- a separate layer having a structured surface hereinafter, referred to as a light collecting layer
- a layer expressing different functions are combined.
- the optical sheet or the optical sheet that combines other functions in the light collecting layer is provided, which will be described below in more detail with reference to the accompanying drawings.
- FIG. 1 is a cross-sectional view of a compounded optical sheet according to a preferred embodiment of the present invention
- Figures 2 to 7 is a cross-sectional view of the compounded optical sheet according to another preferred embodiment of the present invention.
- the same reference numerals are used for the same components for convenience, but they do not necessarily mean the same things in composition and form.
- FIG. 1 includes light including light diffusing particles 25 on at least one surface of the base layer 10.
- the light collecting layer 40 may also include foamed beads 35.
- a light diffusing layer including light diffusing particles 25 is formed on at least one surface of the base layer 10 without including the air layer 30, and is foamed on the light diffusing layer 20.
- the light collecting layer 40 including the beads 35 may be formed. In this case, the light diffusion layer 20 may not be included as shown in FIG. 4.
- a light diffusing layer 20 including both the light diffusing particles 25 and the foaming beads 35 is formed on at least one surface of the substrate layer 10, and on one surface of the light diffusing layer 20.
- One example is an optical sheet including the light collecting layer 40.
- the optical sheets shown in FIGS. 1 to 5 all include foamed beads 35.
- luminance is eliminated by adhering an element and a prism sheet, which conventionally perform a light diffusion function, to eliminate the air layer.
- the problem of lowering can be solved by including the foaming beads 35.
- the light diffusion function is performed, and the air layer 30 including the foam beads 35 is contained, thereby decreasing the brightness. Can be prevented.
- the light collecting layer 40 may further include the foamed beads 35. In this case, luminance may be further improved.
- the optical sheet shown in FIG. 3 omits the air layer 30 and includes the foam beads 35 only in the light collecting layer 40.
- the luminance may be somewhat lower than that of FIG. In that respect it may be advantageous.
- an optical sheet including a light collecting layer 40 including foamed beads 35 and light diffusing particles 25 is illustrated on a substrate layer 10.
- the substrate layer 10 is provided.
- the luminance may be lowered, but the manufacturing process may be reduced, which may be advantageous in terms of reducing the defective rate. have.
- the foamed beads 35 and the optically dispersed particles 25 are included in the light diffusion layer 20.
- the light source diffused through the diffused particles is refracted through the air layer of the adjacent foamed beads and is directed toward the front direction. By condensing the optical path, the luminance can be improved.
- Such foam beads 35 may be formed by mixing a foaming agent in a resin composition or a binder resin forming a layer including the same, and applying the foaming agent and foaming by applying heat.
- a foaming agent is mixed with a resin composition or binder resin constituting the layer including the foamed beads 35, that is, the light diffusion layer 20, the air layer 30, or the light condensing layer 40.
- the foaming agent is in the form of a bead of a double structure of the shell and the core, and becomes a foamed bead 35 containing air as the core portion swells while being vaporized.
- the particle size of the foam beads 35 is preferably to 2 to 100 ⁇ m, which may be 1.2 to 2 times the particle size of the foaming agent before foaming.
- the content of the foam beads 35 is preferably 30 to 300 parts by weight based on 100 parts by weight of the binder resin when the layer containing the light diffusion layer or the air layer, the layer containing the foam beads 35 is the light collecting layer 40 In the case of, it is preferable to include 1 to 30 parts by weight based on 100 parts by weight of the curable resin composition.
- a blowing agent that performs this function is not particularly limited, it is preferable to use isobutane or isopentane, etc., and it is preferable to apply heat of 60 to 200 ° C. for 3 to 300 seconds for proper foaming of the blowing agent, and photocuring. It can also be foamed by the exotherm of the UV curing lamp which occurs incidentally.
- the air layer 30 may use an acrylic polyol or the like as the binder resin, and may be selected from among resins that may be used as the binder resin of the light diffusion layer described later. Can also be used.
- the foaming beads 35 can be formed by mixing and foaming the foaming agent in the binder resin.
- the thickness of the air layer 30 is preferably 2 to 100 ⁇ m.
- the light diffusing layer 20 is formed on one surface of the base layer 10 and the light diffusing layer is provided.
- Condensing layer 40 is formed on 20, or one surface of the substrate layer is formed with a particle dispersing layer 50 including light diffusing particles 25, and condensing layer 40 on the other surface.
- a particle dispersing layer 50 including light diffusing particles 25, and condensing layer 40 on the other surface is also possible to form.
- the concealability can be improved.
- the base layer 10 is not limited.
- polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polystyrene, polymethacrylate, polymethylmethacrylate, polyacrylate It may be formed of any one or more materials selected from polyimide and polyamide, and mainly polyethylene terephthalate film and polycarbonate film may be used, and may be formed into a structure in which irregularities are formed by further including light diffusing particles as necessary. have.
- the thickness of the base layer 10 may be 10 to 1000 ⁇ m in terms of mechanical strength, thermal stability, and flexibility, and in terms of preventing loss of transmitted light, and more preferably 15 to 400 ⁇ m.
- the light diffusing layer 20 is formed by dispersing the light diffusing particles 25 in the binder resin, the binder resin is good adhesion to the base layer 10 and is dispersed
- the compatibility with the light diffusing particles 25 should be good, so that the light diffusing particles 25 may be evenly dispersed in the binder resin to be separated or not easily precipitated.
- binder resins include unsaturated polyesters, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, normal butyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, and hydroxypropyl methacrylate.
- Acrylic resins such as a copolymer or terpolymer, urethane resin, epoxy resin, melamine resin, etc. can be used.
- the light diffusing particles 25 may use a plurality of organic particles or inorganic particles.
- Representative organic particles include methyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, acrylamide, metyrolacrylamide, glycidyl methacrylate, and ethyl acryl.
- Acrylic particles which are homopolymers or copolymers of latex, isobutyl acrylate, normal butyl acrylate and 2-ethylhexyl acrylate; Olefinic particles such as polyethylene, polystyrene and polypropylene; Copolymer particles of an acrylic resin and an olefin resin; And multi-layered multicomponent particles formed by forming particles of a homopolymer and then overlaid with other types of monomers on the layer.
- the inorganic particles silicon oxide, aluminum oxide, titanium oxide, zirconium oxide, magnesium fluoride and the like can be used.
- organic and inorganic particles are merely exemplary and are not limited to the particles of the organic or inorganic materials listed above, and may be replaced by other known materials as long as the main object of the present invention can be achieved. Obviously, such material change is also within the scope of the technical idea of the present invention.
- the light diffusing particles 25 may be dispersed in a single layer or multiple layers, preferably having a particle diameter of 1 to 80 ⁇ m, and preferably including 50 to 300 parts by weight based on 100 parts by weight of the binder resin. When the light diffusing particles having such a particle diameter are included in the above content, an appropriate light diffusing effect may be provided while preventing whitening and separation of the particles.
- the thickness of the light diffusion layer 20 may be 5 to 100 ⁇ m.
- the components constituting the layer designated as the particle dispersing layer 50 are also equivalent to the binder resin and the light diffusing particles 25 in forming the light diffusing layer 20, and the thickness thereof may be 1 to 100 ⁇ m.
- the light collecting layer 40 has been described above.
- the composition of the mounted sheet including the composite sheet according to the mounting configuration separates the existing light diffusing member and the prism sheet separately. It is advantageous because the light is diffused while providing the same brightness as in the case of use, thereby improving concealability, thereby reducing the manufacturing process and cost, and reducing the number of sheets to be mounted in the optical sheet assembly for backlight.
- the measurement of the glass transition temperature of the cured film obtained from the crude liquid is determined by the result of DSC (Differential Scanning Calorimetry) according to ASTM E1356, wherein the cured film is a glass surface using a bar coater (bar coater) It is obtained by irradiating at 900mJ / cm 2 using an ultraviolet irradiation device (Fusion, 600Watt / inch 2 ) after coating on.
- DSC Different Scanning Calorimetry
- the viscosity of the crude liquid is a value measured using a Viscometer (Brookfield Inc.) at 25 °C.
- 60 parts by weight of the urethane acrylate oligomer prepared in Synthesis Example 1 10 parts by weight of bisphenol A acrylate, 10 parts by weight of phenoxyethyl methacrylate (Sartomer, SR340), and phenoxy to 100 parts by weight of the total solids 15 parts by weight of ethyl acrylate (Sartomer, SR339), 1.5 parts by weight of photoinitiator 2,4,6-trimethylbenzoyl diphenylphosphine oxide, 1.5 parts by weight of photoinitiator methylbenzoylformate, additive bis (1,2,2,6, 6-pentamethyl-4-piperidyl) sebacate 2.0 parts by weight was mixed and mixed at 60 ° C. for 1 hour to prepare a composition (glass transition temperature -30 ° C. when forming a cured film and the viscosity of the crude liquid at 25 ° C., 3500 cps).
- Example 1 An optical sheet was manufactured in the same manner except that the addition of urethane acrylate oligomer and 50 parts by weight of bisphenol A acrylate, 20 parts by weight. At this time, the crude liquid had a viscosity of 2200 cps at 25 ° C. and a glass transition temperature of 2 ° C. when the cured film was formed.
- Example 2 40 parts by weight of the urethane acrylate oligomer and bisphenol A acrylate in Example 1 An optical sheet was prepared in the same manner except adding 30 parts by weight. At this time, the crude liquid had a viscosity of 1300 cps at 25 ° C. and a glass transition temperature of 12 ° C. when the cured film was formed.
- An optical sheet was manufactured in the same manner as in Example 1, except that 30 parts by weight of the urethane acrylate oligomer and 40 parts by weight of bisphenol A acrylate were added. At this time, the crude liquid had a viscosity of 950 cps at 25 ° C. and a glass transition temperature of 25 ° C. when the cured film was formed.
- An optical sheet was manufactured in the same manner as in Example 1, except that 20 parts by weight of the urethane acrylate oligomer and 50 parts by weight of bisphenol A acrylate were added.
- the crude liquid had a viscosity of 720 cps at 25 ° C. and a glass transition temperature of 38 ° C. when the cured film was formed.
- Example 1 an optical sheet was prepared in the same manner except that the urethane acrylate oligomer obtained in Synthesis Example 2 was used as the urethane oligomer. At this time, the crude liquid had a viscosity of 3300 cps at 25 ° C. and a glass transition temperature of ⁇ 15 ° C. when the cured film was formed.
- Example 1 an optical sheet was prepared in the same manner except that the urethane acrylate oligomer obtained in Synthesis Example 3 was used as the urethane oligomer. At this time, the crude liquid had a viscosity of 3100 cps at 25 ° C. and a glass transition temperature of ⁇ 13 ° C. when the cured film was formed.
- Example 1 an optical sheet was prepared in the same manner except that the urethane acrylate oligomer obtained in Synthesis Example 4 was used as the urethane oligomer. At this time, the crude liquid had a viscosity of 3100 cps at 25 ° C. and a glass transition temperature of ⁇ 10 ° C. when the cured film was formed.
- 3M BEFIII prism film was used as an optical sheet.
- Doosan Corporation's Brtie-200 prism film was used as the optical sheet.
- LG's LES-T2 prism film was used as the optical sheet.
- the maximum load at which substantially no damage was caused to the structured surface of the optical sheet was measured and this was determined as the damage resistance load.
- the damage resistance load was evaluated by the same method as the said 1st test except having changed the coating layer of the laminated
- coating layer surface roughness Sz 10.5um, hardness F, standard 30 ⁇ 10 cm, manufactured by Kolon
- the damage resistance load was evaluated by the same method as the said 1st test except having changed the coating layer of the laminated
- optical sheets of Examples and Comparative Examples were mounted in a module state at a temperature of 60 ° C., a humidity of 80%, and 250 hours to observe whether they were in close contact.
- Example 1 Table 1 division Damage load (g) Scratch resistance Level of adhesion Luminance (cd / m2) First Exam Second test Third Exam Example 1 250 g 200 g 150 g ⁇ ⁇ 2430 Example 2 220 g 180 g 100 g ⁇ ⁇ 2435 Example 3 170 g 150 g 70 g ⁇ ⁇ 2438 Example 4 100 g 70 g 50 g ⁇ ⁇ 2440 Example 5 50 g 30 g 20 g ⁇ ⁇ 2445 Example 6 270 g 210 g 170 g ⁇ ⁇ 2425 Example 7 300 g 230 g 200 g ⁇ ⁇ 2418 Example 8 300 g 250 g 210 g ⁇ ⁇ 2401 Comparative Example 1 10 g 7 g 3 g ⁇ ⁇ 2494 Comparative Example 2 10 g 5 g 3 g ⁇ ⁇ 2476 Comparative Example 3 10 g 5 g 3 g ⁇ ⁇ 2466
- the optical sheet formed with the three-dimensional pattern by the composition having elasticity and toughness according to the present invention is 20g or more under severe environment of damage load, and it can be seen that the scratch resistance is very excellent.
- the inherent brightness of the optical sheet was also found to be appropriate.
- Example 9 instead of the linear triangular prism, an optical sheet was manufactured by forming a lenticular lens having a semicircular cross section, a pitch of 50 mu m, and a height of 25 mu m.
- Example 9 instead of the linear triangular prism, an optical sheet was manufactured by forming a linear prism having a semicircular cross section, a pitch of 50 mu m, and a height of 25 mu m.
- an optical sheet was manufactured by forming a linear prism having a pentagonal cross section, a vertex angle of 95 °, a pitch of 50 ⁇ m, and a height of 25 ⁇ m.
- an optical sheet was manufactured by forming a curved prism having a semicircular cross section, a pitch of 50 mu m, and a height of 25 mu m.
- An optical sheet was prepared in the same manner as in Example 9, except that the urethane acrylate oligomer obtained in Synthesis Example 2 was used as the urethane acrylate oligomer. At this time, the crude liquid had a viscosity of 3900 cps at 25 ° C. and a glass transition temperature of ⁇ 22 ° C. when the cured film was formed.
- An optical sheet was prepared in the same manner as in Example 9, except that the urethane acrylate oligomer obtained in Synthesis Example 3 was used as the urethane acrylate oligomer. At this time, the crude liquid had a viscosity of 3400 cps at 25 ° C. and a glass transition temperature of ⁇ 15 ° C. when the cured film was formed.
- An optical sheet was prepared in the same manner as in Example 9, except that the urethane acrylate oligomer obtained in Synthesis Example 4 was used as the urethane acrylate oligomer.
- the crude liquid had a viscosity of 3300 cps at 25 ° C. and a glass transition temperature of ⁇ 7 ° C. when the cured film was formed.
- the optical sheet having a damage resistance load of 20 g or more is very excellent in scratch resistance of the structured surface.
- the inherent brightness of the optical sheet was also found to be appropriate.
- An air layer was formed on one surface of the cured light diffusing layer as follows; 50 parts by weight of methyl ethyl ketone and 90 parts by weight of toluene were weighed and diluted to 100 parts by weight of an acrylic resin (52-666, manufactured by Aekyung Chemical Co., Ltd.) to prepare a binder resin having a refractive index of 1.49, and then isobutane was used with respect to 100 parts by weight of the binder resin. 50 parts by weight of the particles were mixed and monodispersed into a single layer using a milling machine, which was coated using a gravure coater, and applied to a thickness of 20 ⁇ m after drying. After the gravure coating was heat-treated at 120 °C for 60 seconds so that the average particle diameter of the isobutane particles to 15 ⁇ m.
- an acrylic resin 52-666, manufactured by Aekyung Chemical Co., Ltd.
- a light collecting layer was formed on one surface of the air layer as follows; 70 parts by weight of the urethane acrylate oligomer prepared in Synthesis Example 1, 10 parts by weight of phenoxyethyl methacrylate (Sartomer, SR340), 15 parts by weight of phenoxyethyl acrylate (Sartomer, SR339), photoinitiator 2,4, 1.5 parts by weight of 6-trimethylbenzoyl diphenylphosphine oxide, 1.5 parts by weight of photoinitiator methylbenzoylformate, and 2.0 parts by weight of additive bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate at 60 ° C
- the mixture was cured for 1 hour to prepare a curable composition (glass transition temperature of -30 ° C or less at the time of curing film formation, and viscosity of crude solution 4400 cps at 25 ° C).
- the composition is applied to one surface of the air layer and placed on a frame of a prism roller at 35 ° C., and a type-D bulb is mounted on an ultraviolet irradiation device (Fusion, 600 Watt / inch 2 ), and 900 mJ / cm 2 in the substrate layer direction.
- the optical sheet was manufactured by forming a linear triangular prism having a prism vertex angle of 90 °, a pitch of 50 mu m, and a height of 25 mu m.
- Example 17 an optical sheet was manufactured by forming a lenticular lens having a semicircular cross section, a pitch of 50 ⁇ m, and a height of 25 ⁇ m in place of the linear triangular prism when forming the light collecting layer.
- Example 17 an optical sheet was manufactured by forming a linear prism having a semicircular cross section, a pitch of 50 ⁇ m, and a height of 25 ⁇ m instead of the linear triangular prism in forming the light collecting layer.
- Example 17 an optical sheet was manufactured by forming a linear prism having a pentagonal cross section, a vertex angle of 95 °, a pitch of 50 ⁇ m, and a height of 25 ⁇ m instead of the linear triangular prism in forming the light collecting layer.
- Example 17 an optical sheet was manufactured by forming a curved prism having a semicircular cross section, a pitch of 50 ⁇ m, and a height of 25 ⁇ m instead of the linear triangular prism in forming the light collecting layer.
- Example 17 the optical sheet was manufactured in the same manner as in the case of using a curable composition using the urethane acrylate oligomer obtained in Synthesis Example 2 as the urethane acrylate oligomer when forming the light collecting layer.
- the crude liquid had a viscosity of 3900 cps at 25 ° C. and a glass transition temperature of ⁇ 22 ° C. when the cured film was formed.
- Example 17 the optical sheet was manufactured in the same manner as in the case of using a curable composition using the urethane acrylate oligomer obtained in Synthesis Example 3 as the urethane acrylate oligomer when forming the light collecting layer.
- the crude liquid had a viscosity of 3700 cps at 25 ° C. and a glass transition temperature of -15 ° C. when the cured film was formed.
- Example 17 the optical sheet was manufactured in the same manner as in the case of using a curable composition using the urethane acrylate oligomer obtained in Synthesis Example 4 as the urethane acrylate oligomer when forming the light collecting layer.
- the crude liquid had a viscosity of 3300 cps at 25 ° C. and a glass transition temperature of ⁇ 7 ° C. when the cured film was formed.
- Example 17 60 parts by weight of the urethane acrylate oligomer and bisphenol-A acrylate instead of 70 parts by weight of the urethane acrylate oligomer when forming the light collecting layer
- An optical sheet was produced in the same manner except that the curable composition to which 10 parts by weight was added was used. At this time, the crude liquid had a viscosity of 2500 cps at 25 ° C. and a glass transition temperature of 2 ° C. when the cured film was formed.
- the crude liquid had a viscosity of 1500 cps at 25 ° C. and a glass transition temperature of 9 ° C. when the cured film was formed.
- the crude liquid had a viscosity of 1300 cps at 25 ° C. and a glass transition temperature of 15 ° C. when the cured film was formed.
- the crude liquid had a viscosity of 1020 cps at 25 ° C. and a glass transition temperature of 25 ° C. when the cured film was formed.
- Example 17 except that the curable composition was added to 20 parts by weight of urethane acrylate oligomer, 50 parts by weight of bisphenol A acrylate was used instead of 70 parts by weight of urethane acrylate oligomer when forming the light collecting layer. Sheets were prepared. At this time, the crude liquid had a viscosity of 800 cps at 25 ° C. and a glass transition temperature of 38 ° C. when the cured film was formed.
- Example 17 the optical sheet was manufactured in the same manner except that the isobutane particles were mixed at 100 parts by weight with respect to 100 parts by weight of the binder resin when forming the air layer.
- Example 17 an optical sheet was manufactured in the same manner except that no air layer was formed.
- An air layer was formed on one surface of the cured light diffusing layer as follows; 50 parts by weight of methyl ethyl ketone and 90 parts by weight of toluene were weighed and diluted to 100 parts by weight of an acrylic resin (52-666, manufactured by Aekyung Chemical Co., Ltd.) to prepare a binder resin having a refractive index of 1.49, and then isobutane was used with respect to 100 parts by weight of the binder resin. 50 parts by weight of the particles were mixed and monodispersed into a single layer using a milling machine, which was coated using a gravure coater, and applied to a thickness of 20 ⁇ m after drying. After the gravure coating was heat-treated at 120 °C for 60 seconds so that the average particle diameter of the isobutane particles to 15 ⁇ m.
- an acrylic resin 52-666, manufactured by Aekyung Chemical Co., Ltd.
- a light collecting layer was formed on one surface of the air layer as follows; 40 parts by weight of the urethane acrylate oligomer prepared in Synthesis Example 1, 30 parts by weight of bisphenol A acrylate, 10 parts by weight of phenoxyethyl methacrylate (Sartomer, SR340), phenoxyethyl acrylate (Sartomer, SR339) 15 parts by weight, photoinitiator 2,4,6-trimethylbenzoyl diphenylphosphine oxide 1.5 parts by weight, photoinitiator methylbenzoylformate 1.5 parts by weight, additive bis (1,2,2,6,6-pentamethyl-4-piperidyl) 100 parts by weight of a curable composition mixed with 2.0 parts by weight of sebacate was mixed by mixing 5 parts by weight of polymethyl methacrylate particles (MH20F, manufactured by Kolon) and 5 parts by weight of isobutane particles, followed by mixing at 60 ° C.
- the composition (viscosity 3300 cps at the glass transition temperature of 15 °C and 25 °C when forming the cured film) was applied on the air layer and placed on the frame of the prism roller at 35 °C, type in ultraviolet irradiation device (Fusion, 600 Watt / inch 2 ) -D bulb mounted In the open orientation to the base layer 900mJ / cm 2 irradiated to the prism apex angle is 90 °, a pitch of 50 ⁇ m, heat-curing (150 °C, 5 seconds) occurring in the same time the height of ultraviolet gyeonghwagi form a linear triangular prisms of 25 ⁇ m
- the isobutane particles were foamed to have an average particle diameter of 15 ⁇ m, and a light collecting layer having a refractive index of 1.56 was formed.
- Example 32 an optical sheet was manufactured in the same manner except that a light collecting layer was formed on the optical diffuser layer without forming an air layer.
- Prism Roller Frame placed on the ultraviolet ray irradiation apparatus (Fusion ⁇ , 600Watt / inch 2 ) to the type-D bulb and attached to the irradiated with 900mJ / cm 2 in the direction of the substrate layer a prism apex angle is 90 °, a pitch of 50 ⁇ m, a height of 25 ⁇ m A linear triangular prism was formed and the isobutane particles were foamed with a heat of curing (150 ° C., 5 seconds) generated in an ultraviolet curing machine, so that an average particle diameter was 15 ⁇ m, and a light collecting layer having a refractive index of 1.56 was formed.
- An optical sheet was manufactured in the same manner as in Example 33, except that a composition obtained by mixing 10 parts by weight of isobutane particles with respect to 100 parts by weight of the curable composition was used when forming the light collecting layer.
- An optical sheet was manufactured in the same manner as in Example 34, except that a composition in which isobutane particles were mixed at 7 parts by weight with respect to 100 parts by weight of the curable composition was used when forming the light collecting layer.
- An optical sheet was manufactured in the same manner as in Example 34, except that a composition obtained by mixing 9 parts by weight of isobutane particles with respect to 100 parts by weight of the curable composition was used when forming the light collecting layer.
- Example 34 the optical sheet was manufactured in the same manner except for the use of a composition in which the polymethyl methacrylate particles were mixed to 3 parts by weight with respect to 100 parts by weight of the curable composition when the light collecting layer was formed.
- Example 34 the optical sheet was manufactured in the same manner as in the same method, except that the composition in which the polymethyl methacrylate particles were mixed at 7 parts by weight based on 100 parts by weight of the curable composition was used.
- Condensing layer was formed on one surface of the cured light diffusing layer as follows; 40 parts by weight of the urethane acrylate oligomer prepared in Synthesis Example 1, 30 parts by weight of bisphenol A acrylate, 10 parts by weight of phenoxyethyl methacrylate (Sartomer, SR340), phenoxyethyl acrylate (Sartomer, SR339) 15 parts by weight, photoinitiator 2,4,6-trimethylbenzoyl diphenylphosphine oxide 1.5 parts by weight, photoinitiator methylbenzoylformate 1.5 parts by weight, additive bis (1,2,2,6,6-pentamethyl-4-piperidyl) A composition obtained by mixing 2.0 parts by weight of sebacate at 60 ° C.
- a light collecting layer was formed as follows; 40 parts by weight of the urethane acrylate oligomer prepared in Synthesis Example 1, 30 parts by weight of bisphenol A acrylate, 10 parts by weight of phenoxyethyl methacrylate (Sartomer, SR340), phenoxyethyl acrylate (Sartomer, SR339) 15 parts by weight, photoinitiator 2,4,6-trimethylbenzoyl diphenylphosphine oxide 1.5 parts by weight, photoinitiator methylbenzoylformate 1.5 parts by weight, additive bis (1,2,2,6,6-pentamethyl-4-piperidyl) A composition obtained by mixing 2.0 parts by weight of sebacate at 60 ° C.
- a prism film (LC213, manufactured by Kolon Corporation) was laminated on one surface of the light diffusion film (LD602, manufactured by Kolon Corporation).
- a prism film (3M BEF III) was laminated on one surface of the light diffusion film (LD602, manufactured by Kolon Corporation).
- a prism film (Brtie-200 from Doosan Corporation) was laminated on one surface of the light diffusion film (LD602, manufactured by Kolon Corporation).
- a prism film (LES-T2 from LG Corp.) was laminated on one surface of the light diffusion film (LD602, manufactured by Kolon Corporation).
- Luminance was measured after the backlight was turned on using BCON-7 BM-7 for 2 hours, and the value was removed from all the sheets except the reflective sheet and diffuser plate in the backlight unit (BLU, 32 inches). And equipped with an optical member manufactured in Comparative Example, measured at intervals of 1MM on the brightest part and measured at intervals of 1MM in all directions, indicating the percentage of the difference between the highest luminance value and the lowest luminance value divided by the highest luminance value (Waber Fraction,%). ) Value was measured, and this value represents the lamp hiding property of the optical member manufactured according to the above Examples and Comparative Examples. The larger the Weber fraction, the lower the hiding property.
- the optical sheet according to the embodiment of the present invention having a damage resistance load of 20 g or more can be seen that the scratch resistance of the structured surface is very excellent.
- the inherent brightness of the optical sheet was also found to be appropriate.
- the damage resistance is appropriate but the adhesion stain does not occur, which is more advantageous.
- optical sheet according to the embodiments of the present invention was composited, it could be seen that the conventional prism film and the light diffusing film were provided with the same level of brightness and concealment.
- the protective film may be omitted, as the light collecting layer may prevent damage caused by film lamination, it is expected that problems caused by laminating a plurality of films may be prevented.
- the scratch resistance was evaluated to be excellent ( ⁇ ) despite the somewhat low damage load value, which was concealed by foamed beads or the like contained in the air layer or the diffusion layer, or by the laminated structure. Due to the effect, the results of the scratch resistance evaluation by visual observation seemed to be better evaluated.
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Abstract
Description
구분 | 내손상 하중(g) | 내스크래치성 | 밀착수준 | 휘도(cd/㎡) | ||
제1시험 | 제2시험 | 제3시험 | ||||
실시예 1 | 250g | 200g | 150g | ◎ | ◎ | 2430 |
실시예 2 | 220g | 180g | 100g | ○ | ◎ | 2435 |
실시예 3 | 170g | 150g | 70g | ○ | ◎ | 2438 |
실시예 4 | 100g | 70g | 50g | ○ | ◎ | 2440 |
실시예 5 | 50g | 30g | 20g | △ | ◎ | 2445 |
실시예 6 | 270g | 210g | 170g | ◎ | ◎ | 2425 |
실시예 7 | 300g | 230g | 200g | ◎ | ◎ | 2418 |
실시예 8 | 300g | 250g | 210g | ◎ | ◎ | 2401 |
비교예 1 | 10g | 7g | 3g | × | ◎ | 2494 |
비교예 2 | 10g | 5g | 3g | × | ◎ | 2476 |
비교예 3 | 10g | 5g | 3g | × | ◎ | 2466 |
구분 | 내손상 하중(g) | 내스크래치성 | 밀착수준 | 휘도(cd/㎡) | ||
제1시험 | 제2시험 | 제3시험 | ||||
실시예 9 | 450g | 350g | 250g | ◎ | ○ | 2425 |
실시예 10 | 550g | 500g | 400g | ◎ | △ | 2245 |
실시예 11 | 500g | 450g | 400g | ◎ | △ | 2106 |
실시예 12 | 400g | 350g | 300g | ◎ | ○ | 2410 |
실시예 13 | 350g | 300g | 250g | ◎ | ○ | 2418 |
실시예 14 | 270g | 250g | 200g | ◎ | ○ | 2401 |
실시예 15 | 250g | 230g | 180g | ◎ | ○ | 2364 |
실시예 16 | 230g | 200g | 150g | ◎ | ◎ | 2347 |
비교예 1 | 10g | 7g | 3g | × | ◎ | 2494 |
비교예 2 | 10g | 5g | 3g | × | ◎ | 2476 |
비교예 3 | 10g | 5g | 3g | × | ◎ | 2466 |
구분 | 내손상 하중(g) | 내스크래치성 | 밀착수준 | 휘도(cd/㎡) | 은폐성(%) | ||
제1시험 | 제2시험 | 제3시험 | |||||
실시예 17 | 450g | 350g | 250g | ◎ | ○ | 2525 | 0.71 |
실시예 18 | 550g | 500g | 400g | ◎ | △ | 2247 | 0.68 |
실시예 19 | 500g | 450g | 400g | ◎ | △ | 2133 | 0.70 |
실시예 20 | 400g | 350g | 300g | ◎ | ○ | 2475 | 0.70 |
실시예 21 | 350g | 300g | 250g | ◎ | ○ | 2449 | 0.68 |
실시예 22 | 270g | 250g | 200g | ◎ | ○ | 2520 | 0.70 |
실시예 23 | 250g | 230g | 180g | ◎ | ○ | 2520 | 0.69 |
실시예 24 | 230g | 200g | 150g | ◎ | ◎ | 2528 | 0.70 |
실시예 25 | 250g | 200g | 150g | ◎ | ◎ | 2530 | 0.70 |
실시예 26 | 220g | 180g | 100g | ○ | ◎ | 2532 | 0.69 |
실시예 27 | 170g | 150g | 70g | ○ | ◎ | 2535 | 0.69 |
실시예 28 | 100g | 70g | 50g | ○ | ◎ | 2530 | 0.70 |
실시예 29 | 50g | 30g | 20g | △ | ◎ | 2532 | 0.69 |
실시예 30 | 450g | 350g | 250g | ◎ | ○ | 2548 | 0.72 |
실시예 31 | 450g | 350g | 250g | ◎ | ○ | 2501 | 0.80 |
실시예 32 | 210g | 170g | 100g | ○ | ◎ | 2527 | 0.70 |
실시예 33 | 210g | 170g | 100g | ○ | ◎ | 2508 | 0.73 |
실시예 34 | 200g | 150g | 70g | ◎ | ◎ | 2500 | 0.72 |
실시예 35 | 220g | 170g | 100g | ◎ | ◎ | 2518 | 0.68 |
실시예 36 | 180g | 150g | 70g | ◎ | ◎ | 2520 | 0.70 |
실시예 37 | 180g | 150g | 70g | ◎ | ◎ | 2511 | 0.67 |
실시예 38 | 150g | 120g | 70g | ◎ | ◎ | 2505 | 0.71 |
실시예 39 | 150g | 120g | 70g | ◎ | ◎ | 2503 | 0.70 |
실시예 40 | 150g | 100g | 70g | ◎ | ◎ | 2489 | 0.72 |
실시예 41 | 150g | 100g | 70g | ◎ | ◎ | 2480 | 0.71 |
비교예 4 | 10g | 70g | 5g | × | ◎ | 2580 | 0.80 |
비교예 5 | 10g | 7g | 3g | × | ◎ | 2533 | 0.80 |
비교예 6 | 10g | 5g | 3g | × | ◎ | 2528 | 0.80 |
비교예 7 | 10g | 5g | 3g | × | ◎ | 2522 | 0.80 |
Claims (18)
- 경화성 수지로 이루어지고 다수의 광학적 입체패턴이 형성되어 구조화된 표면을 갖는 광학 시트에 있어서,다음과 같이 정의되는 내손상 하중이 20g 이상인 것을 특징으로 하는 광학 시트.내손상 하중: 구조화된 표면 위에, 표면거칠기(Sz)가 0.5um 내지 15um이고 경도가 2B 내지 2H인 입자를 함유하는 코팅층을 포함하는 폴리에틸렌테레프탈레이트 필름의 코팅층을 인접하도록 적층하고, 폴리에틸렌테레프탈레이트 필름 상에 일정 하중을 가한 상태에서 300mm/min 속도로 광학 시트를 잡아당겨 구조화된 표면의 손상여부를 관찰하였을 때 실질적으로 손상이 일어나지 않는 시점의 최대 하중.
- 제 1 항에 있어서,기재층;기재층의 적어도 일면에 형성되며, 바인더 수지와 광확산성 입자를 포함하는 광확산층;광확산층 상에 형성되며, 바인더 수지와 발포성 비드를 포함하는 공기층; 및공기층 상에 형성되고, 발포성 비드를 함유하거나 하지 않은 경화성 수지로 이루어지고 다수의 광학적 입체패턴이 형성되어 구조화된 표면을 갖는 집광층을 포함하는 것을 특징으로 하는 광학 시트.
- 제 1 항에 있어서,기재층;기재층의 적어도 일면에 형성되며, 바인더 수지와 광확산성 입자를 포함하는 광확산층; 및광확산층 상에 형성되고, 발포 비드를 포함하는 경화성 수지로 이루어지며, 다수의 광학적 입체패턴이 형성되어 구조화된 표면을 갖는 집광층을 포함하는 것을 특징으로 하는 광학 시트.
- 제 1 항에 있어서,기재층;기재층의 적어도 일면에 형성되며, 바인더 수지와 광확산성 입자를 포함하는 광확산층; 및광확산층 상에 형성되고, 경화성 수지로 이루어지며 다수의 광학적 입체패턴이 형성되어 구조화된 표면을 갖는 집광층을 포함하는 것을 특징으로 하는 광학 시트.
- 제 1 항에 있어서,기재층;기재층의 일면에 형성되며, 바인더 수지와 광확산성 입자를 포함하는 입자분산층; 및기재층의 나머지 일면에 형성되고, 경화성 수지로 이루어지며 다수의 광학적 입체패턴이 형성되어 구조화된 표면을 갖는 집광층을 포함하는 것을 특징으로 하는 광학 시트.
- 제 1 항에 있어서,기재층;기재층의 적어도 일면에 형성되며, 바인더 수지, 광확산성 입자 및 발포성 비드를 포함하는 광확산층; 및광확산층 상에 형성되고, 경화성 수지로 이루어지며 다수의 광학적 입체패턴이 형성되어 구조화된 표면을 갖는 집광층을 포함하는 것을 특징으로 하는 광학 시트.
- 제 1 항에 있어서,기재층; 및기재층의 적어도 일면에 형성되고, 발포 비드 및 광확산성 입자를 포함하는 경화성 수지로 이루어지며, 다수의 광학적 입체패턴이 형성되어 구조화된 표면을 갖는 집광층을 포함하는 것을 특징으로 하는 광학 시트.
- 제 1 항에 있어서, 내손상 하중이 30g 이상인 것을 특징으로 하는 광학 시트.
- 제 1 항에 있어서, 내손상 하중이 30g 내지 500g인 것을 특징으로 하는 광학 시트.
- 제 1 항에 있어서, 경화성 수지는 우레탄 아크릴레이트계 화합물, 스티렌계 화합물, 부타디엔계 화합물, 이소프렌 단량체 및 실리콘 아크릴레이트계 화합물 중에서 선택된 적어도 하나의 화합물, 또는 비스페놀 아크릴레이트계 화합물 및 플루오렌 아크릴레이트계 화합물 중에서 선택되는 적어도 하나의 화합물과의 혼합물 중에서 선택된 어느 하나 이상의 자외선 경화형 올리고머 또는 자외선 경화형 단량체; 및 광개시제를 포함하는 경화성 조성물로부터 형성된 것을 특징으로 하는 광학 시트.
- 제 1 항에 있어서, 경화성 수지는 자외선 경화형 올리고머 또는 자외선 경화형 단량체로 우레탄 아크릴레이트계 화합물 및 비스페놀 아크릴레이트계 화합물을 포함하는 경화성 조성물로부터 형성된 것을 특징으로 하는 광학 시트.
- 제 11 항에 있어서, 경화성 수지는 우레탄 아크릴레이트계 화합물을 전체 고형분 100중량부에 대하여 10 내지 80중량부 되도록 포함하는 경화성 조성물로부터 형성된 것을 특징으로 하는 광학 시트.
- 제 11 항 또는 제 12 항에 있어서, 경화성 수지는 비스페놀 아크릴레이트계 화합물을 전체 고형분 100중량부에 대하여 5 내지 80중량부 되도록 포함하는 경화성 조성물로부터 형성된 것을 특징으로 하는 광학 시트.
- 제 10 항에 있어서, 경화성 수지는 점도가 25℃일 때 100 내지 5,000cps인 경화성 조성물로부터 형성된 것을 특징으로 하는 광학 시트.
- 제 1 항에 있어서, 경화성 수지는 유리전이온도가 40℃ 이하인 것을 특징으로 하는 광학 시트.
- 제 15 항에 있어서, 경화성 수지는 유리전이온도가 -15~25℃인 것을 특징으로 하는 광학 시트.
- 제 1 항에 있어서, 광학적 입체패턴은 단면이 다각형, 반원형 또는 반타원형인 다면체 형상; 단면이 다각형, 반원형 또는 반타원형인 기둥 형상; 및 단면이 다각형, 반원형 또는 반타원형인 곡선 기둥 형상 중 선택된 한 가지 이상의 형상을 갖는 것을 특징으로 하는 광학 시트.
- 제 1 항에 있어서, 광학적 입체패턴은 꼭지각이 90°인 단면이 삼각형인 기둥 형상을 갖는 것을 특징으로 하는 광학 시트.
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US12/812,431 US8526111B2 (en) | 2008-01-10 | 2009-01-09 | Optical sheet with structured surface |
CN200980108531.XA CN101971061B (zh) | 2008-01-10 | 2009-01-09 | 光学片 |
EP09701086.2A EP2237081A4 (en) | 2008-01-10 | 2009-01-09 | OPTICAL FOILS |
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KR (1) | KR101066635B1 (ko) |
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Also Published As
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US20110051247A1 (en) | 2011-03-03 |
TWI418889B (zh) | 2013-12-11 |
EP2237081A2 (en) | 2010-10-06 |
TW200942922A (en) | 2009-10-16 |
KR20090077709A (ko) | 2009-07-15 |
CN101971061B (zh) | 2014-04-16 |
KR101066635B1 (ko) | 2011-09-22 |
US8526111B2 (en) | 2013-09-03 |
EP2237081A4 (en) | 2014-07-16 |
WO2009088247A3 (ko) | 2009-10-08 |
JP5379162B2 (ja) | 2013-12-25 |
CN101971061A (zh) | 2011-02-09 |
JP2011509436A (ja) | 2011-03-24 |
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