WO2011071065A1 - 光拡散フィルム及びそれを組み込んだバックライト装置 - Google Patents
光拡散フィルム及びそれを組み込んだバックライト装置 Download PDFInfo
- Publication number
- WO2011071065A1 WO2011071065A1 PCT/JP2010/071981 JP2010071981W WO2011071065A1 WO 2011071065 A1 WO2011071065 A1 WO 2011071065A1 JP 2010071981 W JP2010071981 W JP 2010071981W WO 2011071065 A1 WO2011071065 A1 WO 2011071065A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- film
- light diffusion
- diffusion film
- adhesive layer
- Prior art date
Links
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- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 3
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- XBFJAVXCNXDMBH-UHFFFAOYSA-N tetracyclo[6.2.1.1(3,6).0(2,7)]dodec-4-ene Chemical compound C1C(C23)C=CC1C3C1CC2CC1 XBFJAVXCNXDMBH-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
-
- 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
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
Definitions
- the present invention relates to a light diffusing film excellent in light diffusibility and adhesiveness, and a backlight device incorporating the same.
- the light diffusion film is widely used as a member of various lighting fixtures, display devices or screens.
- the light diffusing film may be used by being stuck with an adhesive or a pressure-sensitive adhesive for workability and shape stability, in addition to being used by simply overlapping with other members.
- the light diffusing film is used by being attached to the surface of the light guide plate with an adhesive or an adhesive when incorporated in a planar light source device or a backlight device (see, for example, Patent Documents 1 to 3).
- this method requires a step of laminating an adhesive or the like, and has a problem that it is economically disadvantageous.
- Patent Document 1 a surface light diffusion type light diffusion film of a bead coating method is bonded to the surface of the light guide plate with a UV curable adhesive, but no mention is made of the brightness enhancement effect by the bonding.
- Patent Document 2 a directional light diffusing film is bonded to the light exiting surface of the light guide plate with a light diffusing adhesive containing fine particles. Not mentioned.
- Patent Document 3 a liquid resin made of acrylic acid prepolymer is applied to the surface of a light guide plate made of acrylic resin, a light diffusion film made of polycarbonate resin is laminated on the coated surface, and then the liquid resin is cured to be integrated. It has become.
- Patent Document 3 describes that air and foreign matters are prevented from being mixed at the interface between the light guide plate and the diffusion film, and light emission and reduction of diffusion due to this are suppressed. This method is described that the brightness is higher than when pasted with a double-sided adhesive tape, suggesting that the refractive index difference at the interface between the light guide plate and the light diffusion film affects the brightness. However, the effect is not clearly shown.
- the light diffusion film made of polycarbonate resin is shown to be a surface diffusion type light diffusion film utilizing the diffusion and scattering of light by the surface protrusions from the described figure, but its specific contents No optical properties are disclosed.
- Patent Document 4 an optical film that has been processed to have a concavo-convex process so as to increase the surface area is bonded to the surface of the basic unit of the backlight device with an adhesive layer.
- the problem to be solved by the invention of Patent Document 4 is that “an optical sheet with an adhesive provided with an optical adhesive layer can be attached to an adherend that emits light to efficiently emit light.
- the diffusion plate, the BEF, and the diffusion plate that were installed on the backlight used for luminance evaluation are mounted as they are. Only the comparison is made, and the effect of bonding in the same optical film is not disclosed.
- Patent Document 5 discloses a light-scattering laminated film in which a transparent resin layer is laminated on at least one surface of a light-scattering layer composed of a continuous phase and a particulate dispersed phase having different refractive indexes. An unmodified polypropylene resin is used for the transparent resin layer, and the adhesiveness is insufficient.
- Patent Document 6 discloses a light reflecting film provided with an adhesive layer, but does not provide an adhesive layer on a light diffusion film.
- An object of the present invention is to solve the above-mentioned problems of the prior art, a light diffusing film having excellent light diffusibility and light resistance, excellent economical efficiency, and excellent adhesion to other members. And a backlight device incorporating the same.
- the present invention comprises the following configurations (1) to (9).
- An adhesive layer containing a polyolefin resin containing a polar group as a main component on at least one surface of a light diffusion layer containing two kinds of mutually incompatible polyolefin resins as a main component is the outermost surface.
- a light diffusing film, wherein the film has a total light transmittance of 66 to 100% and a haze of the film of 20 to 100%.
- the light diffusing film as described in (1) wherein the diffusivity in the main diffusion direction of the transmitted light measured at an incident angle of 0 degrees is 140 to 180 degrees.
- the two types of mutually incompatible polyolefin resins are composed of a polypropylene resin and a polyolefin resin containing ethylene and / or butene, according to any one of (1) to (3) Light diffusion film.
- a backlight device comprising a base material surface of a light exit surface of a basic unit of a backlight, and the adhesive layer surface of the light diffusing film according to any one of (1) to (6) bonded together.
- the light diffusing film of the present invention is excellent in both light transmission and diffusing properties, has good light resistance, and has excellent adhesion to other members.
- other members can be bonded by thermocompression bonding. It can be easily bonded, and is also economical. Therefore, it can be used suitably for various lighting devices, display devices and optical devices and devices such as screens.
- the light diffusing film of the present invention for a backlight device the light output efficiency of the backlight device can be increased, and the brightness of the backlight device can be increased.
- the economical efficiency of the backlight device can be improved by reducing the output of the light source of the backlight device and reducing the number of used optical films.
- an adhesive layer containing a polyolefin resin containing a polar group as a main component is laminated on at least one surface of a light diffusing layer containing two kinds of mutually incompatible polyolefin resins as a main component.
- the total light transmittance of the film is 66 to 100%, and the haze of the film is 20 to 100%.
- the light diffusion layer of the present invention contains two kinds of mutually incompatible polyolefin resins as main components.
- a main component means that a content rate is 50 mass% or more, Preferably it is 70 mass% or more.
- a polyolefin resin does not have an aromatic ring and thus is not easily deteriorated by ultraviolet irradiation. Therefore, since yellowing by ultraviolet irradiation is suppressed, it is suitable as a constituent material for the light diffusion film.
- the two types of incompatible polyolefin resins are not limited as long as they are a combination of resins that are incompatible with each other, but are preferably composed of a polypropylene resin and a polyolefin resin containing ethylene and / or butene.
- the two types of mutually incompatible polyolefin resins are preferably composed of a cyclic polyolefin resin and a polyethylene resin.
- a nanocrystal structure control polyolefin elastomer resin may be further combined with the above two combinations.
- the polyolefin resin is not limited as long as 70 mol% or more thereof is composed of an olefin monomer.
- the proportion of the olefin monomer is preferably 90 mol% or more, more preferably 95% or more, and further preferably 98% or more.
- polyolefin resins include polyethylene resins, polypropylene resins, polybutene resins, polyolefin resins such as cyclic polyolefin resins and polymethylpentene resins, and copolymers thereof.
- modified polyolefin resins in which functional groups such as carboxyl groups, ester groups, and hydroxyl groups are introduced into these resins are also preferably used.
- the polyethylene resin may be a single polymer or a copolymer. In the case of a copolymer, it is preferable that 50 mol% or more is an ethylene component.
- the density and polymerization method of the resin are not limited, but it is preferable to use a copolymer having a density of 0.909 or less. For example, a copolymer with octene is mentioned.
- the polymerization method may be either a metallocene catalyst method or a nonmetallocene catalyst method.
- the polypropylene resin may be a single polymer or a copolymer. In the case of a copolymer, it is preferable that 50 mol% or more is a propylene component.
- the production method, molecular weight and the like of the resin are not limited, but those having high crystallinity are preferable from the viewpoint of heat resistance and the like. Specifically, the crystallinity is determined by the heat of fusion measured by a differential scanning calorimeter (DSC), and preferably has a heat of fusion of 65 J / g or more.
- polyolefin resins containing ethylene and / or butene examples include homopolyethylene resins, homopolybutene resins, copolymers of these resins with other olefinic monomers, acrylic acid, methacrylic acid, and ester derivatives thereof.
- a copolymer etc. are mentioned.
- any of random, block and graft copolymers may be used.
- a dispersion such as EP rubber may be used.
- the production method and molecular weight of the resin For example, it is preferable to use the polyethylene resin or a copolymer of ethylene and butene.
- cyclic polyolefin-based resin examples include those having a cyclic polyolefin structure such as norbornene and tetracyclododecene.
- a resin obtained by hydrogenating a ring-opening (co) polymer of a norbornene-based monomer after performing polymer modification such as addition of maleic acid or cyclopentadiene, if necessary (2) a norbornene-based polymer Examples thereof include resins obtained by addition-type polymerization of monomers, and (3) resins obtained by addition-type copolymerization of norbornene monomers and olefin monomers such as ethylene and ⁇ -olefin.
- the polymerization method and the hydrogenation method can be performed by conventional methods.
- the nano-crystal structure control type polyolefin elastomer resin is a thermoplastic polyolefin-based elastomer in which the crystal / amorphous structure of the polymer is controlled in the nano order and the crystal has a network structure in the nano order.
- the conventional polyolefin-based elastomer resin has a crystal size on the order of microns, whereas the nanocrystal structure control-type polyolefin-based elastomer resin has a feature that the crystal size is controlled on the order of nanometers.
- the blending ratio of the two mutually incompatible polyolefin resins is preferably 10/90 to 90/10, more preferably 20/80 to 80/20, and more preferably 30/70 to 70 / 30 is more preferable.
- At least two types of incompatible polyolefin-based resins may be blended in the film forming step, or may be blended in advance by a kneading method or the like.
- two kinds of resins other than mutually incompatible polyolefin resins may be blended, and additives such as a compatibilizing agent and a dispersion diameter adjusting agent for improving the conformability of each resin are added.
- additives such as a compatibilizing agent and a dispersion diameter adjusting agent for improving the conformability of each resin are added.
- blend additives such as stabilizers, such as antioxidant and a ultraviolet absorber, and antistatic agent.
- fine particles such as inorganic particles and polymer beads may be added as long as the above optical characteristics are not impaired.
- the melt flow rate of the two kinds of mutually incompatible polyolefin resins is not particularly limited as long as the above optical characteristics are satisfied.
- Each resin is appropriately selected in the range of a melt flow rate measured at 230 ° C. of 0.1 to 100, preferably 0.2 to 50.
- the adhesive layer of the present invention contains a polyolefin resin containing a polar group as a main component.
- a main component means that a content rate is 10 mass% or more, Preferably it is 30 mass% or more.
- the polyolefin resin containing a polar group preferably contains at least one monomer of ethylene, propylene, butene, hexene, octene, methylpentene and cyclic olefin as the skeleton. It may be a homopolymer using one kind of the above monomer or a copolymer using two or more kinds.
- polar group contained in the polyolefin resin carboxyl group, sulfonic acid group, phosphonic acid group, hydroxyl group, glycidyl group, isocyanate group, amino group, imide group, oxazoline group, ester group, ether group, carboxylate metal base
- examples include sulfonic acid metal bases, phosphonic acid metal bases, tertiary amine bases, and quaternary amine bases.
- the polar group may be one kind or two or more kinds.
- the polar group preferably contains at least a carboxyl group.
- the polar group may be introduced directly into the polymer chain of the polyolefin resin, or may be introduced into another resin, added to the polyolefin resin, and mixed.
- the polyolefin resin can also be used after being modified by reacting, for example, a carboxyl group or a hydroxyl group with a compound capable of reacting with these introduced into the terminal or inside of the molecular chain.
- the polyolefin resin containing a polar group may be used alone or in combination of two or more. Moreover, the compound of the polyolefin resin which does not contain a polar group, and another kind of resin may be sufficient. By using a polyolefin resin containing a polar group, the adhesive layer of the present invention can be bonded by heat.
- the configuration and the manufacturing method are not limited.
- the adhesive layer may be laminated on either one side or both sides of the light diffusion layer.
- the total thickness of the film is not limited, but is preferably 10 to 500 ⁇ m.
- the thickness of the adhesive layer is preferably 2 to 100 ⁇ m on one side.
- the ratio of the thickness of the light diffusion layer / adhesion layer in the light diffusion film is preferably 10/1 to 3/1, more preferably 6/1 to 4/1. By setting such a ratio of thickness, the smoothness of the adhesive layer can be sufficiently obtained.
- the total light transmittance of the light diffusing film of the present invention is 66 to 100%, preferably 68% or more, more preferably 70% or more, and most preferably 100%.
- the upper limit of the total light transmittance is 100% in principle. If the total light transmittance is less than 66%, the utilization efficiency of the amount of light emitted from the light source decreases, which is not preferable.
- the haze of the light diffusion film of the present invention is 20 to 100%, preferably 25% or more, and more preferably 30% or more. In principle, the upper limit of haze is 100%.
- the haze of the film is preferably 72% or more, and more preferably 75% or more. If the haze is less than 20%, the light diffusibility is too low, and the effect of controlling the diffusivity is insufficient.
- the light diffusion film of the present invention preferably has a diffusivity in the main diffusion direction of transmitted light of 140 to 180 degrees measured at an incident angle of 0 degree with a goniophotometer measured by the method described in the examples. .
- the diffusion degree is more preferably 145 to 180 degrees, and further preferably 150 to 180 degrees.
- the light diffusion film of the present invention preferably has a light inflection of 1 to 100% in the main diffusion direction measured by the method described in Examples.
- the inflection degree of light is more preferably 2 to 100%, further preferably 5 to 100%.
- the method for producing the light diffusing film is not particularly limited as long as the above optical characteristics are satisfied, but a method of forming a film by a melt extrusion method is preferable from the viewpoint of economy.
- the light diffusibility is imparted by blending the polyolefin resin of the film without containing the non-melting fine particles. Therefore, even if it is carried out by melt extrusion molding, Filtering filter clogging can be reduced, productivity is excellent, and the resulting film has high clarity.
- each layer is extruded by a plurality of separate extruders, and the layers are merged in a die to form a film
- a so-called multilayer extrusion method a light diffusing layer film and an adhesive layer film.
- a method of forming films separately and sticking them with an adhesive or a pressure-sensitive adhesive a so-called extrusion laminating method in which an adhesive layer or a light diffusion layer is melt-extruded and laminated on a light diffusion layer film or an adhesive layer film, etc. Is mentioned.
- the multilayer extrusion method is preferable in terms of the adhesive force between the light diffusion layer and the adhesive layer.
- the melt extrusion method is not particularly limited, and may be, for example, either a T-die method or an inflation method.
- the film may be an unstretched film or may be subjected to a stretching process.
- the backlight device of the present invention is formed by bonding the adhesive layer surface of the above-mentioned light diffusion film to the base material surface of the light exit surface of the basic unit of the backlight device.
- the basic unit of the backlight device of the present invention is not particularly limited as long as it has a light emitting surface on at least one side.
- any of an edge light system and a direct type may be used.
- a double-sided light emission type may be used.
- the base material surface of the light exit surface of the basic unit of the backlight device is, for example, the light exit surface of the light guide plate in the case of the edge light system.
- a direct type it refers to the upper substrate surface.
- the double-sided light emission type it refers to the surfaces on both sides of the edge light type light guide plate.
- a reflective film or a reflector is used on the opposite surface of the light emitting surface for the purpose of increasing the luminance of the light emitting surface.
- the reflective film and the reflector include a diffusing type made of a white body, a highly directional film utilizing reflection by metallic luster, and a film having both characteristics.
- the edge light type backlight device employs a method of applying a light emission pattern by printing, engraving, engraving, etc. It doesn't matter. Since the method of the present invention differs greatly from the conventional method in which various optical members are simply overlapped and installed, the light emission profile is greatly different. Therefore, the light emission pattern is designed to be compatible with the method of the present invention. preferable. In the method of the present invention, since the amount of emitted light at a short distance from the light source is increased, it is preferable to further increase the inclination of the light emission pattern.
- the basic unit of the backlight device is preferably an edge light type light guide plate.
- the amount of light emitted to the surface of the backlight device due to a change in the critical angle of incident light propagating through the light guide plate is increased, and the brightness improvement effect is further increased.
- the backlight device can be made thinner than the direct type, it is easy to meet market demands for thin display devices and lighting devices.
- the reason for the brightness improvement effect of the backlight device of the present invention is presumed as follows. That is, for example, when propagating through the light guide plate, light having an angle exceeding the critical angle is reflected at the interface between the light guide plate and the light diffusion film, and does not exit the surface of the light guide plate.
- a conventionally widely used light diffusion film is simply superimposed on the surface of the light guide plate, an air layer exists between the light diffusion film and the substrate. Since the refractive index of air is significantly lower than the refractive index of the base material, the critical angle becomes small, so that the amount of light emitted to the surface of the base material becomes low, and as a result, the luminance decreases.
- the refractive index of the resin used for the light diffusion film is larger than that of air. Therefore, by bonding the light diffusion film, the critical angle of light propagating through the light guide plate is increased, so that the amount of light emitted to the surface of the light guide plate is increased, resulting in an improvement in luminance.
- the above-mentioned brightness enhancement effect is first manifested by using the light diffusion film of the present invention.
- a light diffusion component such as beads is applied to the surface of a conventionally used shaping method or transparent film.
- the effect is small.
- the light diffusion film of the present invention is a so-called internal diffusion film that imparts light diffusibility by light scattering by a light scatterer made of mutually incompatible resins existing inside the film, and is a surface diffusion type light diffusion. The light diffusing effect is greatly different from the film.
- the light diffusing film of the present invention is a multilayer scattering type in which light scattering occurs throughout the film, and since this light scattering acts in a multilayer manner, the critical angle is widened to the surface of the light guide plate.
- the emitted light effectively acts to improve the luminance.
- luminance improves efficiently by limiting the optical characteristic of a light-diffusion film to the above ranges.
- the method of bonding the adhesive layer surface of the light diffusion film and the substrate surface is not particularly limited as long as the air layer existing between the light diffusion film and the substrate is excluded.
- it may be bonded with a pressure-sensitive adhesive or an adhesive, or may be bonded together with a liquid. Since a light-diffusion film has heat adhesiveness, the method of bonding both by the heat bonding method is preferable.
- the present invention by adhering the light diffusing film and the base material, for example, there is also a secondary effect that a dimensional change due to an environmental change such as a temperature of the light diffusing film can be suppressed.
- the difference in refractive index between the adhesive layer of the light diffusing film and the substrate is preferably ⁇ 0.2 to +0.5.
- the difference in refractive index is more preferably ⁇ 0.1 to +0.2, and most preferably 0.
- the refractive index is displayed up to 3 digits after the decimal point.
- the refractive index may be evaluated by the difference in 1 digit after the decimal point (rounded off to 2 digits after the decimal point).
- the refractive index is measured by a regular method using a refractometer.
- literature values may be used for resins with literature values. In the case of a mixture of resins, the value obtained by weighted averaging according to the composition ratio using the value of a single resin was used.
- the backlight device of the present invention it is preferable to use only one light diffusion film. This is because the multilayer diffusion film has high brightness, uniformity of brightness, and disappearance of the light emission pattern, and thus it is not necessary to use an optical film such as a lens film or a brightness enhancement film. However, in combination with the lens film, it is possible to further increase the luminance and to further reduce the output of the lamp used in the backlight device.
- the backlight device of the present invention can be used as a light source for a display device. Since the backlight device of the present invention has high luminance, when used as a light source for a display device, the brightness of the display device can be improved and the visibility of the display screen can be improved. When high brightness is not required, the amount of light of the backlight lamp can be reduced, so that the manufacturing cost and energy consumption of the display device can be reduced.
- the display device is not limited as long as the device has a function of transmitting some information by light emitted from the backlight device. For example, LCD display devices for transportation devices such as personal computers, TVs and vehicles can be mentioned. In addition, non-moving image display devices such as advertisements and information boards are listed.
- the backlight device of the present invention can be used as a light source for illumination. Since the backlight device of the present invention has high luminance, that is, high illuminance, the brightness of the lighting device can be improved as a light source for lighting. Similarly, when high illuminance is not required, the manufacturing cost and energy consumption of the lighting device can be reduced.
- the backlight device itself may be used as the illumination light source.
- surface it incident and measured from the contact bonding layer side. When the adhesive layer was laminated on both surfaces and there was a difference in the surface roughness of both surfaces, the measurement was performed by entering light from the surface having the smaller surface roughness.
- Diffusion degree of transmitted light in main diffusion direction Measurement was performed using an automatic variable angle photometer (GP-200: manufactured by Murakami Color Research Co., Ltd.). Transmission measurement mode, light incident angle: 0 ° (angle that is perpendicular to the sample surface, up and down, right and left), light receiving angle: -90 ° to 90 ° (angle on the equator plane), filter: ND10 used, luminous flux Under the conditions of aperture: 10.5 mm (VS-1 3.0), light receiving aperture: 9.1 mm (VS-3 4.0), SENSITIVITY: 950, HIGH VOLTON: 600, and variable angle interval 0.1 degree, The frequency of the angle between the peak rising angle and the peak ending angle of the variable angle luminous intensity curve of the transmitted light obtained by moving the light receiver from 90 degrees to +90 was obtained (see FIG.
- the measurement was performed by entering light from the surface having the smaller surface roughness.
- the film direction with the larger diffusivity was defined as the main diffusion direction.
- the light-up film (product registration) 100DX2 film which is a light diffusion film manufactured by Kimoto Co., Ltd.
- the film winding direction is parallel to the vertical direction of the sample fixing base, and diffusion is performed.
- the sample was fixed to the sample fixing base so that the layer side was the light emission side, and the variable angle photometric measurement was performed under the same conditions as described above.
- Inflection of light Measurement was performed using an automatic goniophotometer (GP-200: manufactured by Murakami Color Research Co., Ltd.). Transmission measurement mode, light incident angle: 0 ° (angles perpendicular to the sample surface, up and down, right and left), light receiving angle: -90 ° to 90 ° (angle on the equator plane), filter: ND10 used, beam stop 10.5 mm (VS-1 3.0), light-receiving aperture: 9.1 mm (VS-3 4.0), and measurement with a variable angle interval of 0.1 degree.
- GP-200 manufactured by Murakami Color Research Co., Ltd.
- the peak height (H0) of transmitted light obtained by changing the settings of SENSITIVITY and HIGH VOLTON so that it is 40 to 90% (H0), and the incident angle of light is 60 ° (angle on the equator line)
- the height (H60) at an angle of 0 degree of the peak of transmitted light when measured under the same conditions as described above was obtained except for changing to. Inflection degree was calculated
- required by this method. See FIG. Inflection of light H60 / H0 x 100 (%)
- the surface on which the light receiver is moved is defined as the equator plane. The inflection of light was determined by measurement in the main diffusion direction.
- Adhesive strength between the light diffusion film and the base material A 3 mm thick and transparent acrylic plate (Mitsubishi Rayon Co., Ltd .: Acrylite) is set on the fixed base of the hot press machine. A sample is placed on top, and a silicone rubber sheet with a thickness of 3 mm (hardness HsA 50 °) is laid on the sample, and is pressed from above the silicone rubber sheet with a presser indenter whose surface temperature is set to 180 ° C. In addition, a pressing pressure of 49 N / cm 2 was applied for 30 seconds.
- Adhesive strength is 0.1 N / 15 mm or more: Good Adhesive strength is less than 0.1 N / 15 mm: Poor
- Front luminance Example 1 to 5 and Comparative Examples 1 to 5, and the light diffusion film of Reference Example 1 bonded to a backlight unit are referred to as Examples 6 to 10, Comparative Examples 6 to 10, and Reference Example 2, respectively.
- the front luminance of was measured.
- the measuring method is as described in each example, comparative example, and reference example.
- the opening in the front luminance measurement was observed with the naked eye in a state in which the backlight was turned on, and judged according to the following criteria.
- the light guide plate mesh is not visible at all: Good
- the light guide plate mesh is faint: Somewhat poor
- the light guide plate mesh is clearly visible: Bad
- Example 1 Using two melt extruders, 35 parts by mass of a cyclic polyolefin resin (TOPAS (TM) 6013S-04 Topas Advanced Polymers melt flow rate: 2.0 (230 ° C.)) was used in the first extruder.
- TOPAS (TM) 6013S-04 Topas Advanced Polymers melt flow rate: 2.0 (230 ° C.) was used in the first extruder.
- a block copolymer resin composed of ethylene and octene (INFUSE (TM) D9817.15 melt flow rate: 26 (230 ° C.) manufactured by Dow Chemical Co., Ltd.) is formed into a light diffusion layer of 65 parts by mass, and the second extruder
- an adhesive layer composed of a maleated polypropylene resin (Admer (TM) QF551, Mitsui Chemicals, Ltd., melt flow rate: 5.7 (190 ° C.)) as the adhesive resin forms both sides of the light diffusion layer.
- the light diffusion layer is cooled by cooling with a cooling roll with a mirror surface.
- a light diffusion film having a total thickness of 400 ⁇ m with an adhesive layer laminated on the surface was obtained, and the film was closely attached to the cooling roll during the cooling using a vacuum chamber (layer thickness structure (adhesion layer / light diffusion layer / The adhesive layer was 40/320/40 ( ⁇ m).
- Table 1 shows the characteristics of the obtained light diffusion film.
- the light diffusion film obtained in this example was excellent in light diffusion characteristics and adhesiveness.
- Comparative Example 1 In the method of Example 1, the resin of the adhesive layer formed by the second extruder was a cyclic polyolefin resin (TOPAS (TM) 6013S-04 Topas Advanced Polymers melt flow rate: 2.0 (230 ° C.)).
- a light diffusing film was obtained in the same manner as in Example 1 except that the above was changed. Table 1 shows the characteristics of the obtained light diffusion film.
- the light diffusing film obtained in this Comparative Example was excellent in light diffusing properties, but was inferior in adhesiveness.
- Example 2 In the method of Example 1, except that the total thickness of the light diffusing film is changed to 175 ⁇ m and the layer thickness configuration is changed to 25/125/25 ( ⁇ m), the light diffusing film is formed in the same manner as in Example 1. Obtained. Table 1 shows the characteristics of the obtained light diffusion film.
- the light diffusion film obtained in this example was excellent in light diffusion characteristics and adhesiveness.
- Comparative Example 2 In the method of Example 2, the resin of the adhesive layer formed by the second extruder was a cyclic polyolefin resin (TOPAS (TM) 6013S-04 Topas Advanced Polymers melt flow rate: 2.0 (230 ° C.)).
- a light diffusing film was obtained in the same manner as in Example 2 except that the above was changed. Table 1 shows the characteristics of the obtained light diffusion film.
- the light diffusing film obtained in this Comparative Example was excellent in light diffusing properties, but was inferior in adhesiveness.
- Example 3 In the method of Example 1, the resin of the light diffusion layer formed by the first extruder was a cyclic polyolefin resin (TOPAS (TM) 6015 Topas Advanced Polymers melt flow rate: 0.41 (230 ° C.)). Block copolymer resin consisting of 50 parts by mass, ethylene and octene (INFUSE (TM) D9817.15 melt flow rate: 26 (230 ° C.) manufactured by Dow Chemical Co., Ltd.) Same as Example 1 except for changing to 50 parts by mass A light diffusion film was obtained by the method. Table 1 shows the characteristics of the obtained light diffusion film. The light diffusion film obtained in this example was excellent in light diffusion characteristics and adhesiveness.
- TOPAS (TM) 6015 Topas Advanced Polymers melt flow rate: 0.41 (230 ° C.) Block copolymer resin consisting of 50 parts by mass, ethylene and octene (INFUSE (TM) D9817.15 melt flow rate: 26 (230 ° C.) manufactured by Dow Chemical Co., Ltd
- Table 1 shows the characteristics of the obtained light diffusion film.
- the light diffusing film obtained in this Comparative Example was excellent in light diffusing properties, but was inferior in adhesiveness.
- Example 4 In the method of Example 3, except that the total thickness of the light diffusion film is changed to 200 ⁇ m and the layer thickness configuration is changed to 20/160/20 ( ⁇ m), the light diffusion film is formed in the same manner as in Example 3. Obtained. Table 1 shows the characteristics of the obtained light diffusion film.
- the light diffusion film obtained in this example was excellent in light diffusion characteristics and adhesiveness.
- Comparative Example 4 In the method of Comparative Example 3, a light diffusing film was obtained in the same manner as in Comparative Example 3, except that the total thickness of the light diffusing film was changed to 200 ⁇ m and the layer thickness configuration was changed to 20/160/20 ( ⁇ m). It was. Table 1 shows the characteristics of the obtained light diffusion film.
- the light diffusing film obtained in this Comparative Example was excellent in light diffusing properties, but was inferior in adhesiveness.
- Example 5 In the method of Example 1, the resin composition of the light diffusing layer was changed to a block copolymer resin (INFUSE (TM) manufactured by Dow Chemical Co., Ltd.) composed of 65 parts by mass of polypropylene resin (Sumitomo Chemical Co., Ltd., Sumitomo Nobrene FS2011DG3) and ethylene and octene. D9817.15 Melt flow rate: 26 (230 ° C.) An unstretched sheet was obtained in the same manner as in Example 1 except that the content was changed to 35 parts by mass. Subsequently, this unstretched sheet was stretched 4.5 times at a stretching temperature of 118 ° C.
- the light diffusion film obtained in this example was excellent in light diffusion characteristics and adhesiveness.
- Example 5 In the method of Example 5, the resin of the adhesive layer formed by the second extruder was changed from a polypropylene-based adhesive resin (Admer (TM) QF551, Mitsui Chemicals, melt flow rate: 5.7 (190 ° C.)).
- a light diffusion film was obtained in the same manner as in Example 5 except that the resin was changed to polypropylene resin (Sumitomo Chemical Co., Ltd., Sumitomo Noblen FS2011DG3). Table 1 shows the characteristics of the obtained light diffusion film.
- the light diffusing film obtained in this comparative example was excellent in light diffusing properties, but was inferior in adhesiveness.
- Example 6 to 10 and Comparative Examples 6 to 10 Near the center on the acrylic plate on the outgoing light side of a 19-inch light guide plate type (mesh type using a white reflective film) with three cold cathode tubes on each side of the long diameter side (lateral direction)
- An evaluation sample of 40 mm x 60 mm square (60 mm side is the horizontal direction) is placed on the surface, a silicone rubber sheet is placed on the surface, and the surface temperature is about 180 ° C from the surface of the silicone rubber sheet. Then, press and stick for about 1 minute, and install the black shading paper provided with a 30mm x 50mm square (50mm side is the horizontal direction) so that the center of the cutout part is the center of the evaluation sample The brightness was measured in a dark room.
- the black light-shielding paper was fixed so that the entire backlight unit was covered, and measurement was performed so that light did not leak. Moreover, the backlight unit was installed horizontally and measured. Luminance was measured using a Topcon Spectroradiometer SR-3A manufactured by Topcon Technohouse Co., Ltd. at a measurement angle of 2 degrees, at a distance of 40 cm from the backlight unit surface, and at the position where the center of the sample for evaluation was directly below. did. The measurement was performed by installing the sample for evaluation so that the main diffusion direction was perpendicular to the longitudinal direction of the cold cathode tube. The results obtained by using the light diffusing films of Examples 1 to 5 and Comparative Examples 1 to 5 as evaluation samples are shown in Table 2 as Examples 6 to 10 and Comparative Examples 6 to 10, respectively.
- the light diffusion films of Examples 1 to 5 are adhered to the acrylic plate surface by an adhesive layer, air between the acrylic plate and the light diffusion film is excluded, and the difference in refractive index at the interface becomes small. Was expensive. In addition, since the optical characteristics of inflection and diffusivity are in a preferable range, the light emission pattern is excellent in disappearance. On the other hand, the light diffusing films of Comparative Examples 1 to 5 have a weak adhesive force between the acrylic plate and the light diffusing film, and air between the two materials is not excluded, resulting in a large difference in the refractive index of the interface between the two members. Compared with the light diffusion films of Examples 1 to 5, the front luminance was remarkably inferior.
- the light guide plate was placed in an oven at 80 ° C. and allowed to stand for 240 hours.
- those maintaining the same dimensions and shape as those before warming were excellent and considered good.
- those that curled or reduced in size due to the heating treatment were considered inferior and were judged to be defective.
- the results are shown in Table 2.
- the light diffusing films obtained in Examples 1 to 5 were not deformed and maintained the same size and shape as before heating, but the light diffusing films obtained in Comparative Examples 1 to 5 were subjected to heating treatment. The light diffusing film curled and the dimensions were reduced.
- An unstretched sheet was obtained by performing melt coextrusion by a T-die method and cooling with a casting roll at 20 ° C. so that A and the light diffusion layer B were laminated.
- this unstretched sheet was stretched 4.8 times at a stretching temperature of 120 ° C. using the difference in roll peripheral speed of a longitudinal stretching machine, and subsequently heated at 165 ° C. by a tenter-type stretching machine, and then stretched at 155 ° C. The film was stretched 9 times in the transverse direction at the temperature.
- heat setting was performed at 166 ° C. to obtain a light diffusion film in which the thickness of the base layer A / light diffusion layer B was 22.2 / 2.8 ( ⁇ m), respectively.
- Table 1 shows the characteristics of the obtained light diffusion film. Further, using the obtained light diffusion film, front luminance, dimensional stability, and light emission pattern disappearance were measured in the same manner as in Examples 6 to 10 and Comparative Examples 6 to 10. The results are shown in Table 2.
- the light diffusion film of this reference example was inferior in dimensional stability because there was no adhesive layer. Also, it is indicated that high brightness cannot be obtained because the inflection and diffusion are low. Moreover, the disappearance of the light emission pattern was also inferior.
- Reference Example 2 Near the center on the acrylic plate on the outgoing light side of a 19-inch light guide plate type (mesh type using a white reflective film) with three cold cathode tubes on each side of the long diameter side (lateral direction)
- the light diffusion film obtained in Reference Example 1 of 40 mm ⁇ 60 mm square (the 60 mm side is the horizontal direction) is attached to the part with an acrylic optical adhesive tape (double-sided separate film type), and the 30 mm ⁇ 50 mm square (the 50 mm side is horizontal)
- a black shading paper provided with a cutout portion in the direction) was placed so that the center of the cutout portion was the center portion of the evaluation sample, and the luminance was measured in a dark room.
- the black light-shielding paper was fixed so that the entire backlight unit was covered, and measurement was performed so that light did not leak. Moreover, the backlight unit was installed horizontally and measured. Luminance was measured using a Topcon Spectroradiometer SR-3A manufactured by Topcon Technohouse Co., Ltd. at a measurement angle of 2 degrees, at a distance of 40 cm from the backlight unit surface, and at the position where the center of the sample for evaluation was directly below. did. The measurement was performed by installing the sample for evaluation so that the main diffusion direction was perpendicular to the longitudinal direction of the cold cathode tube. Bonding was performed such that the layer A side of the light diffusion film was the adhesive tape side.
- the light diffusing film of this reference example has a lower degree of inflection and diffusion than the light diffusing films obtained in Examples 1 to 5, and therefore, unlike the light diffusing films obtained in Examples 1 to 5, It was shown that the brightness improvement effect by bonding was small. Moreover, the disappearance of the light emission pattern was also inferior.
- the light diffusing film of the present invention has both excellent light transmissive and diffusive properties and good light resistance, and can be easily bonded to other members by thermocompression bonding. Therefore, it can be suitably used for various lighting devices, display devices, optical devices and devices such as screens. Furthermore, by using the light diffusing film of the present invention for a backlight device, it is possible to increase the brightness of the backlight device and to improve the economics of the backlight device.
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Abstract
Description
(1)二種の互いに非相溶性のポリオレフィン系樹脂を主成分として含有する光拡散層の少なくとも片面に、極性基を含有するポリオレフィン樹脂を主成分として含有する接着層が最表面になるように積層された光拡散フィルムであって、前記フィルムの全光線透過率が66~100%であり、かつ前記フィルムのヘーズが20~100%であることを特徴とする光拡散フィルム。
(2)入射角0度で測定した透過光の主拡散方向の拡散度が140~180度であることを特徴とする(1)に記載の光拡散フィルム。
(3)主拡散方向の光の変曲度が1~100%であることを特徴とする(1)又は(2)に記載の光拡散フィルム。
(4)二種の互いに非相溶性のポリオレフィン系樹脂が、ポリプロピレン系樹脂とエチレン及び/又はブテンを含有するポリオレフィン樹脂とからなることを特徴とする(1)~(3)のいずれかに記載の光拡散フィルム。
(5)二種の互いに非相溶性のポリオレフィン系樹脂が、環状ポリオレフィン系樹脂とポリエチレン系樹脂とからなることを特徴とする(1)~(3)のいずれかに記載の光拡散フィルム。
(6)極性基を含有するポリオレフィン樹脂がカルボキシル基を含有することを特徴とする(1)~(5)のいずれかに記載の光拡散フィルム。
(7)バックライトの基本ユニットの出光面の基材表面に、(1)~(6)のいずれかに記載の光拡散フィルムの接着層面を貼り合せてなることを特徴とするバックライト装置。
(8)基材と接着層の屈折率差が-0.2~+0.5であることを特徴とする(7)に記載のバックライト装置。
本発明の光拡散フィルムは、二種の互いに非相溶性のポリオレフィン系樹脂を主成分として含有する光拡散層の少なくとも片面に、極性基を含有するポリオレフィン樹脂を主成分として含有する接着層が積層されてなり、フィルムの全光線透過率が66~100%であり、かつフィルムのヘーズが20~100%であることを特徴とする。
本発明のバックライト装置は、バックライト装置の基本ユニットの出光面の基材表面に、上述の光拡散フィルムの接着層面を貼り合わせてなるものである。
日本電色工業株式会社製ヘーズ測定器「NDH-2000」を用いて、JIS-K-7136に準拠して測定した。
フィルムの巻き方向を垂直方向及び水平方向にそれぞれ上記測定器の試料台に固定して測定し、それぞれ3回の測定で得られた測定値の平均値を用い、さらに両方向の測定値の平均値を求めて表示した。該対応をするのは、フィルムの巻き方向を垂直方向及び水平方向により平行光線透過率が大きく変わることがあるためである。
なお、接着層が片面に積層されたサンプルについては、接着層側より入光して測定をした。接着層が両面に積層され、かつ両面の表面粗さに差がある場合は、表面粗さが小さい方の面より入光して測定した。
自動変角光度計(GP-200:株式会社村上色彩研究所製)を用いて測定を行った。
透過測定モード、光線入射角:0°(試料面に対して上下、左右共に直角になる角度)、受光角度:-90°~90°(赤道線面上の角度)、フィルター:ND10使用、光束絞り:10.5mm(VS-1 3.0)、受光絞り:9.1mm(VS-3 4.0)、SENSITIVITY:950、HIGH VOLTON:600及び変角間隔0.1度の条件で、-90度から+90まで受光器を移動させて測定することにより得た、透過光の変角光度曲線のピーク立ち上がり角度とピークの終了の角度との間の角度の度数を求めた(図1参照)。ピークの立ち上がり及び終了の角度は、これらの部分を10倍のルーペで観察して、ピークの線が消えた最先端の角度をそれぞれの角度とした。
なお、受光器を移動させる面を赤道面と定義した。
上記角度をフィルムの巻き方向が試料固定台の上下方向と平行方向及び水平方向になるように固定して測定し、該角度の大きい方の値を拡散度とした。
なお、接着層が片面に積層されたサンプルについては、接着層側より入光して測定した。接着層が両面に積層され、かつ両面の表面粗さに差がある場合は、表面粗さが小さい方の面より入光して測定した。
拡散度の大きい方のフィルム方向を主拡散方向とした。
測定に際しては、試料の測定の前に、きもと株式会社製の光拡散フィルムであるライトアップフィルム(商品登録)100DX2フィルムをフィルムの巻き方向が試料固定台の上下方向と平行方向になり、かつ拡散層側が出光側になるように試料固定台に固定して、上記と同じ条件で変角光度測定を実施した。この測定において、変角光度曲線のピークトップの高さがフルスケールに対して、80%を超えるか、あるいは70%未満であった場合は、この値がフルスケールに対して70~80%になるようにSENSITIVITYあるいはHIGH VOLTONダイヤルの数値の微調整を行った。
自動変角光度計(GP-200:株式会社村上色彩研究所製)を用いて測定を行った。
透過測定モード、光線入射角:0°(試料面に対して上下、左右共に直角の角度)、受光角度:-90°~90°(赤道線面上の角度)、フィルター:ND10使用、光束絞り:10.5mm(VS-1 3.0)、受光絞り:9.1mm(VS-3 4.0)及び変角間隔0.1度の条件で測定し、透過光のピークトップが、チャートの40~90%になるようにSENSITIVITYやHIGH VOLTONの設定を変更して測定することにより得た透過光のピークの高さ(H0)と、光線入射角を60°(赤道線面上の角度)に変更する以外は、上記条件と同じ条件で測定した時の透過光のピークの角度0度における高さ(H60)とを求めた。この方法で求めたH60とH0を用いて下記式で変曲度を求めた。図2参照。
光の変曲度=H60/H0×100(%)
なお、受光器を移動させる面を赤道面と定義した。
光の変曲度は、主拡散方向において測定して求めた。
熱プレス機の固定台の上に、厚みが3mmの表面が平滑で透明なアクリル板(三菱レイヨン(株)製:アクリライト)をセットし、そのアクリル板上に試料を置き、さらに、その上に厚みが3mm(硬度HsA50°)のシリコーンゴムシートを敷き、表面温度が180℃に設定された加圧用の圧子により、上記のシリコーンゴムシートの上より押さえ付けて、49N/cm2の圧力で30秒間押し圧をした。加熱圧着後、温度23℃、相対湿度65%の環境下で30分放置し、東洋精機社製「テンシロン」(UTM-IIIL)を用いて、300mm/分の速度で180度剥離した際の抵抗値を接着力とした。
接着力の判定は、以下の基準で実施した。
接着力が0.1N/15mm以上:良
接着力が0.1N/15mm未満:不良
JIS-K-7210 A法に準拠して、2.16kgfの条件で測定した。
実施例1~5及び比較例1~5、参考例1の光拡散フィルムをバックライトユニットに貼り合せたものをそれぞれ実施例6~10及び比較例6~10、参考例2とし、それらの正面輝度を測定した。測定方法は各実施例、比較例、参考例に記載したとおりである。
正面輝度測定における開口部をバックライトが点灯させた状態で肉眼観察し、以下の基準で判定した。
導光板のメッシュが全く見えない:良
導光板のメッシュがかすかに見える:やや不良
導光板のメッシュがはっきり見える:不良
2台の溶融押し出し機を用い、第1の押し出し機にて、環状ポリオレフィン系樹脂(TOPAS(TM)6013S-04 Topas Advanced Polymers社製 メルトフローレート:2.0(230℃))35質量部とエチレンとオクテンよりなるブロック共重合樹脂(ダウ・ケミカル社製 INFUSE(TM) D9817.15 メルトフローレート:26(230℃))65質量部とからなる光拡散層を形成し、第2の押し出し機にて、接着性樹脂としてマレイン化ポリプロピレン系樹脂((アドマー(TM)QF551 三井化学社製 メルトフローレート:5.7(190℃))からなる接着層が光拡散層の両面を形成するように、Tダイ方式にて溶融共押出し後、鏡面の冷却ロールで冷却することにより、光拡散層の両面に接着層が積層された総厚み400μmの光拡散フィルムを得た。上記冷却時の冷却ロールへのフィルムの密着はバキュームチャンバーを用いて行った。層厚み構成(接着層/光拡散層/接着層)は40/320/40(μm)であった。
得られた光拡散フィルムの特性を表1に示す。
本実施例で得られた光拡散フィルムは、光拡散特性に優れ、かつ接着性にも優れていた。
実施例1の方法において、第2の押し出し機にて形成する接着層の樹脂を、環状ポリオレフィン系樹脂(TOPAS(TM)6013S-04 Topas Advanced Polymers社製 メルトフローレート:2.0(230℃))に変更した以外は、実施例1と同様の方法で、光拡散フィルムを得た。
得られた光拡散フィルムの特性を表1に示す。
本比較例で得られた光拡散フィルムは、光拡散特性に優れているが、接着性に劣っていた。
実施例1の方法において、光拡散フィルムの総厚みを175μmに変更し、層厚み構成を25/125/25(μm)に変更する以外は、実施例1と同様の方法で、光拡散フィルムを得た。
得られた光拡散フィルムの特性を表1に示す。
本実施例で得られた光拡散フィルムは、光拡散特性に優れ、かつ接着性にも優れていた。
実施例2の方法において、第2の押し出し機にて形成する接着層の樹脂を、環状ポリオレフィン系樹脂(TOPAS(TM)6013S-04 Topas Advanced Polymers社製 メルトフローレート:2.0(230℃))に変更した以外は、実施例2と同様の方法で、光拡散フィルムを得た。
得られた光拡散フィルムの特性を表1に示す。
本比較例で得られた光拡散フィルムは、光拡散特性に優れているが、接着性に劣っていた。
実施例1の方法において、第1の押し出し機にて形成する光拡散層の樹脂を、環状ポリオレフィン系樹脂(TOPAS(TM)6015 Topas Advanced Polymers社製 メルトフローレート:0.41(230℃))50質量部とエチレンとオクテンよりなるブロック共重合樹脂(ダウ・ケミカル社製 INFUSE(TM) D9817.15 メルトフローレート:26(230℃))50質量部に変更する以外は、実施例1と同様の方法で、光拡散フィルムを得た。
得られた光拡散フィルムの特性を表1に示す。
本実施例で得られた光拡散フィルムは、光拡散特性に優れ、かつ接着性にも優れていた。
環状ポリオレフィン系樹脂(TOPAS(TM)6015 Topas Advanced Polymers社製 メルトフローレート:0.41(230℃))50質量部とエチレンとオクテンよりなるブロック共重合樹脂(ダウ・ケミカル社製 INFUSE(TM) D9817.15 メルトフローレート:26(230℃))50質量部を池貝鉄工社製PCM45押出機を用いて樹脂温度250℃にて溶融混合してTダイで押出し、梨地加工した冷却ロール(Ra=0.55)で冷却することにより、厚み400μmの光拡散フィルムを得た。上記冷却ロールの反対面は表面に離型処理をした(Ra=1.0)押さえロールを用いた。
得られた光拡散フィルムの特性を表1に示す。
本比較例で得られた光拡散フィルムは、光拡散特性に優れているが、接着性に劣っていた。
実施例3の方法において、光拡散フィルムの総厚みを200μmに変更し、層厚み構成を20/160/20(μm)に変更する以外は、実施例3と同様の方法で、光拡散フィルムを得た。
得られた光拡散フィルムの特性を表1に示す。
本実施例で得られた光拡散フィルムは、光拡散特性に優れ、かつ接着性にも優れていた。
比較例3の方法において、光拡散フィルムの総厚みを200μmに変更し、層厚み構成を20/160/20(μm)に変更する以外は、比較例3と同様の方法で光拡散フィルムを得た。
得られた光拡散フィルムの特性を表1に示す。
本比較例で得られた光拡散フィルムは、光拡散特性に優れているが、接着性に劣っていた。
実施例1の方法において、光拡散層の樹脂配合を、ポリプロピレン樹脂(住友化学社製、住友ノーブレン FS2011DG3)65質量部にエチレンとオクテンよりなるブロック共重合樹脂(ダウ・ケミカル社製 INFUSE(TM) D9817.15メルトフローレート:26(230℃))35質量部に変更する以外は、実施例1と同様の方法で、未延伸シートを得た。次いでこの未延伸シートを縦延伸機のロール周速差を利用して延伸温度118℃で4.5倍に延伸し、引き続きその片面にコロナ処理をして厚み200μmの光拡散フィルムを得た。
得られた光拡散フィルムの特性を表1に示す。
本実施例で得られた光拡散フィルムは、光拡散特性に優れ、かつ接着性にも優れていた。
実施例5の方法において、第2の押出し機にて形成する接着層の樹脂をポリプロピレン系の接着性樹脂(アドマー(TM)QF551 三井化学社製 メルトフローレート:5.7(190℃))から、ポリプロピレン樹脂(住友化学社製、住友ノーブレン FS2011DG3)に変更する以外は、実施例5と同様の方法で、光拡散フィルムを得た。
得られた光拡散フィルムの特性を表1に示す。
本比較例で得られた光拡散フィルムは、光拡散特性に優れているが、接着性に劣っていた。
長径側(横方向)の両側に冷陰極管がそれぞれ3本ずつ設けられた19インチの導光板タイプ(白色反射フィルム使用でメッシュタイプ)のバックライトユニットの出射光側のアクリル板上のほぼ中央部に40mm×60mm角(60mm側が横方向)の評価サンプルを設置し、その表面にシリコーンゴムシートをおいて、そのシリコーンゴムシートの表面より、表面温度が約180℃の平板状の加熱治具で、約1分間押さえつけて貼着して、30mm×50mm角(50mm側が横方向)の切り抜き部分を設けた黒色の遮光紙を切り抜き部分の中心が評価サンプルの中心部になるように設置して、暗室で輝度を測定した。黒色の遮光紙はバックライトユニットの全体が覆われる大きさとして固定して光が漏れないようにして測定した。
また、バックライトユニットは水平に設置して測定した。
輝度は(株)トプコンテクノハウス社製のトプコン分光放射計SR-3Aを用いて、測定角度2度で、バックライトユニット表面との距離が40cmで評価用サンプルの中心が直下になる位置で測定した。
測定は、評価用サンプルの主拡散方向が冷陰極管の長手方向と直交方向になるように設置して行った。
実施例1~5及び比較例1~5の光拡散フィルムを評価サンプルとして使用して得られた結果をそれぞれ実施例6~10及び比較例6~10とし、表2に示す。
一方、比較例1~5の光拡散フィルムは、アクリル板と光拡散フィルムの接着力が弱く、両材料間の空気が排除されないために、両部材間の界面の屈折率に大きな差が生じ、実施例1~5の光拡散フィルムに比べて、正面輝度が著しく劣っていた。
寸法安定性の評価において、加温前と同じ寸法と形状を保っているものは優れており、良とした。また加温処理によりカールあるいは寸法の縮小がみられたものは劣るとし、不良とした。結果を表2に示す。
実施例1~5で得られた光拡散フィルムは変形せずに、加温前と同じ寸法と形状を保っていたが、比較例1~5で得られた光拡散フィルムは、加温処理により、光拡散フィルムがカールし、かつ寸法が縮小した。
2台の溶融押し出し機を用い、第1の押し出し機にて、ポリプロピレン樹脂WF836DG3(住友化学社製、住友ノーブレン)100質量部を溶融して基層Aを形成し、第2の押し出し機にて、ポリプロピレン樹脂WF836DG3(住友化学社製、住友ノーブレン)17質量部とプロピレン・エチレン共重合体 HF3101C(日本ポリプロ社製)83質量部を溶融混合して光拡散層Bを形成し、ダイス内にて基層Aと光拡散層Bが積層されるように、Tダイ方式にて溶融共押出し後、20℃のキャスティングロールで冷却することにより未延伸シートを得た。次いでこの未延伸シートを縦延伸機のロール周速差を利用して延伸温度120℃で4.8倍に延伸し、引き続いてテンタ―式延伸機により、165℃で加熱後、155℃の延伸温度で横方向に9倍延伸した。次いで166℃で熱固定を行って、基層A/光拡散層Bの厚み構成がそれぞれ22.2/2.8(μm)の光拡散フィルムを得た。巻き取り直前において基層A表面にコロナ処理を行った。
得られた光拡散フィルムの特性を表1に示す。また、得られた光拡散フィルムを使用して実施例6~10及び比較例6~10と同様にして正面輝度、寸法安定性、及び出光パターン消失性を測定した。その結果を表2に示す。
本参考例の光拡散フィルムは、接着層がないので寸法安定性に劣っていた。また、変曲度や拡散度が低いので、高輝度が得られないことが示される。また、出光パターンの消失性も劣っていた。
長径側(横方向)の両側に冷陰極管がそれぞれ3本ずつ設けられた19インチの導光板タイプ(白色反射フィルム使用でメッシュタイプ)のバックライトユニットの出射光側のアクリル板上のほぼ中央部に40mm×60mm角(60mm側が横方向)の参考例1で得られた光拡散フィルムをアクリル系の光学用粘着テープ(両面セパレートフィルムタイプ)で貼り付けて、30mm×50mm角(50mm側が横方向)の切り抜き部分を設けた黒色の遮光紙を切り抜き部分の中心が評価サンプルの中心部になるように設置して、暗室で輝度を測定した。黒色の遮光紙はバックライトユニットの全体が覆われる大きさとして固定して光が漏れないようにして測定した。
また、バックライトユニットは水平に設置して測定した。
輝度は(株)トプコンテクノハウス社製のトプコン分光放射計SR-3Aを用いて、測定角度2度で、バックライトユニット表面との距離が40cmで評価用サンプルの中心が直下になる位置で測定した。
測定は、評価用サンプルの主拡散方向が冷陰極管の長手方向と直交方向になるように設置して行った。
なお、貼り合わせは、光拡散フィルムのA層側が粘着テープ側になるようにして行った。
また、実施例6~10及び比較例6~10と同様にして寸法安定性及び出光パターン消失性を測定した。その結果を表2に示す。
本参考例の光拡散フィルムは、実施例1~5で得られた光拡散フィルムに比べて変曲度や拡散度が低いので、実施例1~5で得られた光拡散フィルムとは異なり、貼り合わせによる輝度向上効果が小さいことが示された。また、出光パターンの消失性も劣っていた。
Claims (8)
- 二種の互いに非相溶性のポリオレフィン系樹脂を主成分として含有する光拡散層の少なくとも片面に、極性基を含有するポリオレフィン樹脂を主成分として含有する接着層が最表面になるように積層された光拡散フィルムであって、前記フィルムの全光線透過率が66~100%であり、かつ前記フィルムのヘーズが20~100%であることを特徴とする光拡散フィルム。
- 入射角0度で測定した透過光の主拡散方向の拡散度が140~180度であることを特徴とする請求項1に記載の光拡散フィルム。
- 主拡散方向の光の変曲度が1~100%であることを特徴とする請求項1又は2に記載の光拡散フィルム。
- 二種の互いに非相溶性のポリオレフィン系樹脂が、ポリプロピレン系樹脂とエチレン及び/又はブテンを含有するポリオレフィン樹脂とからなることを特徴とする請求項1~3のいずれかに記載の光拡散フィルム。
- 二種の互いに非相溶性のポリオレフィン系樹脂が、環状ポリオレフィン系樹脂とポリエチレン系樹脂とからなることを特徴とする請求項1~3のいずれかに記載の光拡散フィルム。
- 極性基を含有するポリオレフィン樹脂がカルボキシル基を含有することを特徴とする請求項1~5のいずれかに記載の光拡散フィルム。
- バックライトの基本ユニットの出光面の基材表面に、請求項1~6のいずれかに記載の光拡散フィルムの接着層面を貼り合せてなることを特徴とするバックライト装置。
- 基材と接着層の屈折率差が-0.2~+0.5であることを特徴とする請求項7に記載のバックライト装置。
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- 2010-12-08 JP JP2010273243A patent/JP5771963B2/ja active Active
- 2010-12-08 KR KR1020127015523A patent/KR101711689B1/ko active IP Right Grant
- 2010-12-08 WO PCT/JP2010/071981 patent/WO2011071065A1/ja active Application Filing
- 2010-12-09 TW TW099143010A patent/TWI440898B/zh not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
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TW201128241A (en) | 2011-08-16 |
CN102753999A (zh) | 2012-10-24 |
TWI440898B (zh) | 2014-06-11 |
KR101711689B1 (ko) | 2017-03-02 |
KR20120130079A (ko) | 2012-11-28 |
JP5771963B2 (ja) | 2015-09-02 |
JP2011150303A (ja) | 2011-08-04 |
CN102753999B (zh) | 2015-05-20 |
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