WO2007086244A1 - 光学フィルムおよびそれを用いたバックライト装置 - Google Patents
光学フィルムおよびそれを用いたバックライト装置 Download PDFInfo
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- WO2007086244A1 WO2007086244A1 PCT/JP2007/050016 JP2007050016W WO2007086244A1 WO 2007086244 A1 WO2007086244 A1 WO 2007086244A1 JP 2007050016 W JP2007050016 W JP 2007050016W WO 2007086244 A1 WO2007086244 A1 WO 2007086244A1
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- optical film
- light
- backlight device
- light diffusing
- styrene
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Classifications
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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
-
- 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
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/16—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer formed of particles, e.g. chips, powder or granules
-
- 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
-
- 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
-
- 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
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- 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
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/02—Composition of the impregnated, bonded or embedded layer
- B32B2260/025—Particulate layer
-
- 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
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/04—Impregnation, embedding, or binder material
- B32B2260/046—Synthetic resin
-
- 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
- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
- B32B2264/02—Synthetic macromolecular particles
- B32B2264/0214—Particles made of materials belonging to B32B27/00
- B32B2264/025—Acrylic resin particles, e.g. polymethyl methacrylate or ethylene-acrylate copolymers
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0051—Diffusing sheet or layer
Definitions
- the present invention relates to a knocklight device suitably used for applications such as a liquid crystal display, and an optical film suitably used as a member constituting the knocklight device.
- an edge light type or direct type backlight device is used as a liquid crystal display or the like.
- Edge-light type backlight devices are used in notebook PCs because the thickness of the knock light itself can be reduced, and direct-type backlight devices are often used in large liquid crystal televisions. .
- an optical member such as a prism sheet or a lens sheet is installed on the light exit surface side of the light guide plate ( Patent Document 1).
- Patent Document 1 Japanese Patent Laid-Open No. 5-203947 (Claims)
- an object of the present invention is to provide an optical film capable of improving the front luminance and light diffusivity without using such a problematic prism sheet.
- the present inventors have made extensive studies on the material and structure of the optical film, and as a result, have improved the front luminance by stacking a plurality of optical films.
- the ability to improve the front luminance as the number of sheets to be stacked increases.
- a specific material is used, it has been found that high front luminance can be achieved even if the number of layers to be stacked is small. .
- the optical film of the present invention comprises two laminated bodies each having a light diffusing layer in which an acrylic resin particle and a styrene-acrylic copolymer resin binder force are also formed on a transparent support. It is characterized by being combined.
- the optical film of the present invention is preferably characterized in that the glass transition temperature power of the styrene-acrylic copolymer resin binder is 0 ° C or higher.
- the light diffusing layer has a glass transition temperature of 3
- It contains an acrylic resin binder at 0 ° C or lower.
- a light source is disposed at least at one end, a light guide plate having a light exit surface that is substantially orthogonal to the one end, and a light exit surface of the light guide plate.
- the optical film of the present invention is used as the optical member.
- the backlight device of the present invention includes a light source, a light diffusing material disposed on one side of the light source, and an optical member disposed on a side of the light diffusing material different from the light source.
- the optical film of the present invention is used as the optical member.
- the optical film of the present invention has a constitutional force obtained by superposing two laminates having a special constitutional force, the front luminance and the light diffusibility can be improved.
- the knocklight device of the present invention uses the optical film of the present invention as an optical member, the front luminance and light diffusibility can be improved, and the prism sheet can be used alone. The problem of glare as in the case of using can reduce the occurrence of scratches.
- FIG. 1 is a cross-sectional view showing an embodiment of the optical film 1 of the present invention.
- the optical film 1 is formed on an acrylic resin particle and a styrene-acrylic copolymer film on a transparent support 11.
- the laminate has a structure in which two laminates each having a light diffusing layer 12 formed with a fat binder force are overlapped.
- an optical film having good front luminance and light diffusibility can be obtained by stacking two laminated bodies each having a specific structure.
- “superposition” means superposition so that an air layer is interposed between two laminates.
- a spacer may be provided between them to have a predetermined interval, or they may be simply overlapped.
- the air layer is interposed between the two laminated bodies.
- the air layer may be interposed near the center except for the vicinity of the outer periphery.
- a laminate of two sheets may be bonded with an adhesive only near the outer periphery.
- the air layer is not interposed, and thus is not included in the “overlap” in the present invention.
- the light diffusing layer side of one laminate and the side opposite to the light diffusing layer of the other laminate are overlapped.
- the haze JIS K7136: 2000
- total light transmittance JIS K7361—1: 1997)
- the haze was 85% or more and the total light transmittance was 90% or more. It is more preferable that the haze is 90 to 99% and the total light transmittance is 95% or more.
- the support of the laminate can be used without particular limitation as long as it has transparency.
- a transparent support for example, a strong transparent plastic film such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, polystyrene, triacetyl cellulose, acrylic, polychlorinated butyl can be used.
- a polyethylene terephthalate film force that has been stretched, particularly biaxially stretched is preferred in terms of excellent mechanical strength and dimensional stability.
- the thickness of the transparent support is about 25 to 400 ⁇ m.
- the light diffusing layer of the laminate includes at least acrylic resin particles and styrene-acrylic copolymer.
- a polymer resin binder is formed.
- the acrylic resin particles form irregularities on the surface of the light diffusing layer to generate external haze, and also generate internal haze due to a difference in refractive index from the binder resin, and the action of these external haze and internal haze. Therefore, it has a role of improving the front luminance and light diffusibility.
- the acrylic resin particle is not particularly limited as long as it is a particle formed from a material strength containing a resin usually referred to as an acrylic resin, but polymethylmethacrylate. It is preferable to use true spherical particles.
- the acrylic resin particles are preferably those crosslinked with dibulebenzene or the like in terms of heat resistance, solvent resistance, and heat stability.
- the average particle diameter of the acrylic resin particles is preferably 10 to 30 ⁇ m, more preferably 15 to 22 ⁇ m. By setting the average particle size in such a range, the front luminance can be improved.
- the acrylic resin particles preferably have a coefficient of variation in particle size distribution of 10 to 40%, more preferably 15 to 30%.
- the variation coefficient is a value indicating the dispersion state of the particle size distribution, and is obtained by dividing the standard deviation of the particle size distribution (square root of unbiased distribution) by the arithmetic average value (average particle size) of the particle size. The percentage.
- the content of the acrylic resin particles varies depending on the average particle diameter of the particles depending on the thickness of the light diffusing layer, and cannot be generally specified, but is 180 to 270 parts by weight with respect to 100 parts by weight of the binder. Is more preferably 200 to 250 parts by weight. When the amount is 180 parts by weight or more, an optical film having good front luminance and light diffusibility can be obtained, and when the amount is 270 parts by weight or less, a decrease in coating film strength can be prevented.
- the styrene-acrylic copolymer resin binder functions as a binder for holding the acrylic resin particles.
- a resin can be obtained by copolymerizing an acrylic monomer (or talyl resin) and a styrene monomer (or styrene resin). Or graft polymerization of styrene monomer on the side chain of acrylic resin Alternatively, it may be one obtained by graft polymerization with an acrylic monomer on the side chain of a styrene-based resin.
- acrylic monomers include, for example, methyl methacrylate monomers such as methyl methacrylate and ethyl methacrylate, acrylate monomers such as methyl acrylate and ethyl acrylate, hydroxyethyl methacrylate and acrylamide.
- methyl methacrylate monomers such as methyl methacrylate and ethyl methacrylate
- acrylate monomers such as methyl acrylate and ethyl acrylate, hydroxyethyl methacrylate and acrylamide.
- styrene, ⁇ -methylstyrene, butyltoluene and the like can be exemplified as styrene monomers.
- these monomers are used as main components, and other monomers can be copolymerized as necessary.
- the ratio of the styrene component and the acrylic component in the styrene-acrylic copolymer resin is preferably 1: 4 to 4: 1 by weight. By setting it as such a range, the front luminance and light diffusibility of an optical film can be made favorable.
- the styrene-acrylic copolymer resin binder preferably has a glass transition temperature of 40 ° C or higher, more preferably a glass transition temperature of 70 ° C or higher.
- a resin binder having a glass transition temperature of 40 ° C. or higher the front luminance and light diffusibility of the optical film can be improved.
- the glass transition temperature can be adjusted by appropriately changing the degree of polymerization of the resin, the ratio of the acrylic component and the styrene component in the resin.
- the glass transition temperature of styrene homopolymer is 100 ° C
- the glass transition temperature can be adjusted by selecting an acrylic monomer to be copolymerized therewith.
- acrylic monomers are known to have glass transition temperatures from 0 ° C or lower to 100 ° C or higher, and the glass transition temperature can be adjusted by selecting the type of acrylic component.
- the ratio of the styrene-acrylic copolymer resin binder in the total resin binder of the light diffusing layer is preferably 20% or more, more preferably 40% or more. By making such a range, the front luminance and light diffusibility of the optical film are good. Can be.
- the resin binder of the light diffusing layer preferably contains an acrylic resin binder having a glass transition temperature of 30 ° C or lower in addition to the above-mentioned styrene-acrylic copolymer resin binder. .
- an acrylic resin binder having a glass transition temperature of 30 ° C or less as a binder, the front luminance and light diffusibility of the optical film can be improved, and curling of individual laminates can be prevented.
- the glass transition temperature of the acrylic resin binder is more preferably 20 ° C or lower.
- the monomer of acrylic resin having a glass transition temperature of 30 ° C or lower includes the same monomer as the acrylic monomer of styrene-acrylic copolymer resin described above.
- the glass transition temperature can be adjusted to 30 ° C or lower by appropriately changing the ratio of the monomer.
- Commercially available acrylic resins having a glass transition temperature of 30 ° C or less include, for example, the product name Ataridick A811 (Tg: 19 ° C) of Dainippon Yakugaku Ink Industries, Ltd., and the product name Ataridick 49-394IM. (Tg: 16 ° C), trade name Ataridic 52-614 (Tg: 16 ° C), tradename Ataridic 48-261 (Tg: 30 ° C), etc.
- a styrene-acrylic copolymer resin binder and an acrylic resin binder having a glass transition temperature of 30 ° C or less are used in combination as the resin binder of the light diffusing layer, the former resin and the latter resin are used.
- the weight ratio to fat is preferably in the range of 1: 4 to 4: 1, and more preferably in the range of 1: 3 to 3: 1.
- the light diffusibility can be obtained.
- other resin binders can be contained.
- the total proportion of the styrene-acrylic copolymer resin binder and the acrylic resin binder having a glass transition temperature of 30 ° C. or less is 60% or more of the total resin binder in the light diffusing layer. It is more preferable that it is 70% or more.
- hardeners such as isocyanate compounds and melamine compounds can be used.
- a curing agent in a range not exceeding 40%, it is possible to improve performance such as adhesion to the support, coating strength, and solvent resistance.
- the thickness of the light diffusing layer is not particularly limited, but is preferably 15 to 50 m.
- additives such as surface active agents such as leveling agents and antifoaming agents, antioxidants, and UV absorbers, and other additives, as long as the above-described performance is not impaired. Fats may be added.
- the light diffusing layer is formed by applying a coating solution prepared by dissolving a material such as the resin particles constituting the same layer in a suitable solvent onto the support by a known coating method such as a bar coating method. However, it can be formed by drying.
- the surface of the laminate opposite to the surface on which the light diffusing layer is formed is subjected to a fine matte treatment to prevent adhesion with another laminate or other member (light guide plate, etc.). You can also apply a knock coat layer, etc. Further, an anti-curl layer may be formed to prevent the occurrence of curling, or an anti-reflection treatment may be applied to improve the light transmittance.
- the knock coat layer can also serve as a curl prevention layer.
- the optical film of the present invention is a force obtained by stacking two of the above-described laminates.
- the laminates may be the same or different.
- a laminate in which the same light diffusing layer is provided on a support having a different thickness may be combined, or a light diffusing layer having a different ratio of acrylic resin particles to resin binder is provided on the same support. You may combine laminated bodies.
- the thickness of the optical film (the total thickness of the two laminates) varies depending on the application and cannot be generally specified, but is usually less than 1 mm. Further, it is often used at a thickness of about 150 to 800 / ⁇ ⁇ .
- the optical film of the present invention described above is mainly used as a part of a backlight device that constitutes a light source of a liquid crystal display, an electric signboard, or a scanner copy machine.
- a backlight device that constitutes a light source of a liquid crystal display, an electric signboard, or a scanner copy machine.
- FIG. 2 shows an edge light type knock light device which is an embodiment of the knock light device of the present invention.
- the edge light type knock light device includes a light guide plate 21 in which a light source 22 is disposed at least at one end and a surface substantially orthogonal to the one end is a light emitting surface, and the light guide plate
- the configuration includes an optical member 23 disposed on the light emitting surface.
- the force light source showing the light source 22 disposed at both ends may be disposed at one end, or may be disposed at an end other than both ends.
- the above-described optical film of the present invention is used as the optical member 23.
- the optical film is preferably used such that the surface on the light diffusing layer 232 side becomes a light emitting surface. With such a configuration, it is possible to provide a backlight device that has an excellent balance of front luminance and light diffusibility (viewing angle) and is free from glare that may occur when a prism sheet is used.
- the light guide plate 21 is a substantially flat force formed so that at least one side surface is a light incident surface and one surface substantially orthogonal to the light incident surface is a light emission surface, and is mainly composed of polymethyl methacrylate and the like. It consists of a matrix resin selected from highly transparent resin. Moreover, in the light guide plate, resin particles having a refractive index different from that of the matrix resin may be added as necessary. Each surface of the light guide plate may have a complicated surface shape rather than a uniform plane, or may be provided with diffusion printing such as a dot pattern.
- the light source 22 may be a cold cathode tube or an LED. In the configuration shown in the figure, the light source 22 is covered with a light source reflector 24 except for a portion facing the light guide plate 21 so that light from the light source 22 is efficiently incident on the light guide plate 21.
- the edge light type backlight device includes a reflection plate, a polarizing film, an electromagnetic wave shielding film, and the like depending on the purpose.
- a laminate may be further used, or a prism sheet may be used.
- a reflective plate 25 housed in a chassis 26 is provided below the light guide plate 21.
- FIG. 3 shows a direct type backlight device as an embodiment of the knock device of the present invention.
- a plurality of light sources 32 are arranged on a reflector 31 housed in a chassis 35, and an optical film 34 is placed thereon via a light diffusing material 33. It has a structure.
- the optical member 34 is the above-described optical film of the present invention.
- the optical film 34 is arranged so that the surface on the light diffusing layer 342 side becomes the light emitting surface. With such an arrangement, it is possible to obtain a knock rye device that has an excellent balance of front luminance and light diffusibility (viewing angle) and that is free from glare that may occur when a prism sheet is used.
- the light diffusing material 31 is for erasing the pattern of the light source 33, and a milky white resin board or the like can be used.
- the light diffusing material 31 is used to erase the pattern of the light source and has a thickness of 1 to: LOmm. Therefore, it is used to impart appropriate light diffusibility while improving the front luminance, and is different from the thin optical film 34 with a thickness of less than 1 mm.
- the light source 32 may be a cold cathode tube or an LED without particular limitation.
- the direct type backlight device may include a polarizing film, an electromagnetic wave shielding film, and the like depending on the purpose.
- a laminate or a prism sheet In order to further improve the front brightness, use a laminate or a prism sheet.
- the backlight device of the present invention uses the specific optical film as the optical member for controlling the direction of the light emitted from the light source or the light guide plate force.
- the diffusibility can be improved, and the problem of glare as in the case of using a prism sheet alone can also reduce the occurrence of scratches.
- the light diffusing layer coating solution a having the composition described above was applied by a bar coating method so that the thickness after drying was 25 m, and dried at 110 ° C. for 2 minutes to form a light diffusing layer.
- a backcoat layer coating solution b having the following composition was applied by a bar coating method so that the thickness after drying was 5 m, and the temperature was 110 ° C. And dried for 2 minutes to form a backcoat layer, and a laminate was produced.
- the two laminates are overlaid so that the back coat layer side of one laminate and the light diffusing layer side of the other laminate face each other.
- an optical film of Example 1 was obtained.
- Example 2 The added amount of styrene-acrylic copolymer resin in the light diffusing layer coating solution a of Example 1 was changed to 18 parts, the added amount of acrylic resin was changed to 6 parts, and the added amount of isocyanate curing agent was changed to 5 parts.
- the optical film of Example 2 was obtained in the same manner as Example 1 except for the above.
- Example 1 Light Diffusing Layer Coating Solution a Styrene Acrylic Copolymer Resin Addition Amount 6.3 parts, Acrylic Resin Addition Amount 18.9 parts, Isocyanate Curing Agent Addition Amount 4 parts
- An optical film of Example 3 was obtained in the same manner as Example 1 except that the content was changed to.
- Example 4 The addition amount of the styrene-acrylic copolymer resin in the light diffusing layer coating solution a of Example 1 was changed to 23.4 parts, the addition amount of the isocyanate curing agent was changed to 5.5 parts, and the acrylic resin was removed.
- the optical film of Example 4 was obtained in the same manner as Example 1 except that.
- Example 1 Light Diffusing Layer Coating Solution a Styrene Acrylic Copolymer Resin Attaridic 55-129 (Dai Nippon Ink Chemical Co., Ltd., solid content 65%, glass transition temperature 57 ° C., styrenic component 42% ) was changed to 17.3 parts, the additive amount of isocyanate hardener was changed to 5.5 parts, and acrylic resin was removed. Thus, an optical film of Example 5 was obtained.
- each of the laminates A to E is a transparent support.
- the light diffusing layer was provided on one side and the back coat layer was provided on the other side.
- the light diffusing layers of the laminates A to E are all made of acrylic resin particles and an acrylic resin binder.
- the two laminates A are arranged so that the light diffusing layer side of one laminate A and the side opposite to the light diffusing layer of the other laminate A (back coat layer side) are opposed to each other.
- an optical film of Comparative Example 1 was obtained.
- two laminates B to E were superposed to obtain optical films of Comparative Examples 2 to 5.
- the three laminates A were overlapped so that the light diffusing layers faced in the same direction, whereby an optical film of Comparative Example 6 was obtained.
- three laminates B to E were superposed to obtain optical films of Comparative Examples 7 to 10.
- the results obtained for the optical films of Examples 1 to 5 and Comparative Examples 1 to 10 are shown in Table 1 (unit: “cdZm 2 ”). In addition, the measurement result of the brightness
- the edge-light type backlight device incorporating the optical films of Examples 1 to 5 (using two laminates) is the same as the optical films of Comparative Examples 1 to 5 ( The front brightness was about 70 to 150 (cd / m 2 ) higher than that of a backlight device incorporating two laminates.
- the edge-light type backlight device incorporating the optical films of Examples 1 to 5 has a luminance of 30 degrees on the left and right although the front luminance is high, and the backlight device incorporating the optical films of Comparative Examples 1 to 5
- the brightness ratio between the left and right 45 degrees and the front was about 50%, providing sufficient light diffusivity.
- the front brightness was extremely high compared to those in Reference Examples 1 to 10 in which only one laminate was used.
- optical films of Examples 1 to 5 are force laminates in which two laminates are superposed. Comparative Example 6 with three bodies superimposed: Front brightness equivalent to or better than LO optical film. Thus, according to the optical films of Examples 1 to 5, excellent front luminance could be obtained with a small number of laminates.
- the optical film is placed on a light diffusing material (milky white resin plate) so that the light diffusing layer side surface of the optical film is a light emitting surface, and the front luminance and central brightness at the center of the knocklight device are set.
- luminance for every outgoing angle of the long side direction of the backlight apparatus in the center on a backlight apparatus was measured.
- the results obtained for the optical films of Examples 1 to 5 and Comparative Examples 1 to 10 are shown in Table 2 (the unit is “cdZm 2 ”).
- luminance when only one laminated body used in Examples 1-5 and Comparative Examples 1-5 was installed on the light-diffusion material is shown as Reference Examples 1-10.
- the direct type backlight device incorporating the optical films of Examples 1 to 5 (using two laminates) is the same as the optical films of Comparative Examples 1 to 5 (laminates).
- the front brightness was about 130 to 450 (cd / m 2 ) higher.
- the edge-light type backlight device incorporating the optical films of Examples 1 to 5 has a brightness of 4200 (cdZm 2 ) or more at 45 degrees left and right, and the brightness ratio between 45 degrees left and right and the front is about 50%. It had a good light diffusivity.
- the front brightness was extremely higher than those in Reference Examples 1 to 10 in which only one laminate was used.
- the optical films of Examples 1 to 5 are the force obtained by superimposing two laminated bodies. Comparative Examples 6 to 3 in which three laminated bodies are superposed: Front luminance equal to or higher than that of the optical film of LO become Yes. Thus, the optical films of Examples 1 to 5 were able to obtain excellent front luminance with a small number of laminates.
- FIG. 1 is a cross-sectional view showing an example of the optical film of the present invention.
- FIG. 2 is a cross-sectional view showing an embodiment of the backlight device of the present invention.
- FIG. 3 is a sectional view showing another embodiment of the backlight device of the present invention.
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Abstract
Description
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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JP2007555879A JP5270170B2 (ja) | 2006-01-24 | 2007-01-05 | 光学フィルムおよびそれを用いたバックライト装置 |
MX2008009589A MX2008009589A (es) | 2006-01-24 | 2007-01-05 | Pelicula optica y unidad de retroalimentacion que la utiliza. |
CN2007800033855A CN101375184B (zh) | 2006-01-24 | 2007-01-05 | 光学薄膜与使用该光学薄膜的背光装置 |
KR1020087017376A KR101251702B1 (ko) | 2006-01-24 | 2007-01-05 | 광학 필름 및 이것을 사용한 백라이트 장치 |
US12/087,334 US20090067190A1 (en) | 2006-01-24 | 2007-01-05 | Optical Film and Backlight Unit Using the Same |
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JP2006014806 | 2006-01-24 | ||
JP2006-014806 | 2006-01-24 |
Publications (1)
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WO2007086244A1 true WO2007086244A1 (ja) | 2007-08-02 |
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PCT/JP2007/050016 WO2007086244A1 (ja) | 2006-01-24 | 2007-01-05 | 光学フィルムおよびそれを用いたバックライト装置 |
Country Status (8)
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US (1) | US20090067190A1 (ja) |
JP (1) | JP5270170B2 (ja) |
KR (1) | KR101251702B1 (ja) |
CN (1) | CN101375184B (ja) |
MX (1) | MX2008009589A (ja) |
PL (1) | PL386474A1 (ja) |
TW (1) | TWI421544B (ja) |
WO (1) | WO2007086244A1 (ja) |
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JP5937357B2 (ja) * | 2009-12-17 | 2016-06-22 | 株式会社きもと | 光拡散性シート及びこれを用いたバックライト |
JP5985187B2 (ja) * | 2009-12-17 | 2016-09-06 | 株式会社きもと | 光拡散性シート及びこれを用いたバックライト |
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Also Published As
Publication number | Publication date |
---|---|
US20090067190A1 (en) | 2009-03-12 |
JPWO2007086244A1 (ja) | 2009-06-18 |
CN101375184B (zh) | 2012-02-22 |
JP5270170B2 (ja) | 2013-08-21 |
PL386474A1 (pl) | 2009-04-14 |
TWI421544B (zh) | 2014-01-01 |
CN101375184A (zh) | 2009-02-25 |
TW200734691A (en) | 2007-09-16 |
KR101251702B1 (ko) | 2013-04-05 |
KR20080092922A (ko) | 2008-10-16 |
MX2008009589A (es) | 2008-09-11 |
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