WO2015190202A1 - 光拡散性シート及び該シートを含むバックライト装置 - Google Patents
光拡散性シート及び該シートを含むバックライト装置 Download PDFInfo
- Publication number
- WO2015190202A1 WO2015190202A1 PCT/JP2015/063486 JP2015063486W WO2015190202A1 WO 2015190202 A1 WO2015190202 A1 WO 2015190202A1 JP 2015063486 W JP2015063486 W JP 2015063486W WO 2015190202 A1 WO2015190202 A1 WO 2015190202A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- light diffusing
- sheet
- parts
- resin
- Prior art date
Links
Images
Classifications
-
- 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/023—Optical properties
-
- 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
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
Definitions
- the present invention relates to a light diffusing sheet and a backlight device including the sheet.
- edge light type backlight device There are two types of backlight devices used in display devices such as edge light type and direct type, and in recent years, edge light type has become mainstream due to demands for thinner and lighter devices.
- a light guide plate is used in combination with a light source such as an LED or a cold cathode tube, and an optical member such as a light diffusing film is incorporated on the light guide plate.
- a light source such as an LED or a cold cathode tube
- an optical member such as a light diffusing film
- the light diffusive sheet a highly diffusive and highly diffusive light diffusive sheet is often used.
- Patent Document 1 discloses light that improves the luminance in the front direction of the display screen while satisfying the original performance of the light diffusive sheet that makes the pattern provided on the light guide plate invisible.
- a diffusive sheet is proposed.
- the frame of the display screen tends to be narrowed.
- the area close to the light source of the backlight device is also included in the area of the display unit.
- luminance unevenness near the light source of the display unit is reduced, and light leakage at the end of the light guide plate is made inconspicuous.
- the light diffusing sheet of Patent Document 1 does not consider the problem of reducing luminance unevenness in the vicinity of the light source of the display unit and making light leakage at the end of the light guide plate inconspicuous.
- the type, particle size, amount, etc. of the resin particles (light diffusing material) in the light diffusing layer are used to make the light diffusing layer a coating film having a high haze value.
- the haze value reaches a peak at a certain high value, and even with such a high haze value, it is not possible to obtain a coating film that sufficiently reduces the above-described luminance unevenness and light leakage. Even when the resin particles are added, there are problems such as the coating film becomes brittle and the brightness decreases.
- An object of the present invention is to provide a light diffusive sheet that has high light diffusibility and reduces local luminance unevenness and local light leakage while suppressing a decrease in luminance as much as possible. It is.
- the present inventors have not used a haze value (JIS K7105) that has been widely used in this field as a light diffusivity index, but a CIE (International Commission on Illumination) -XYZ table. Evaluation of “high light diffusibility” by “Y value (brightness)” by color system, and found that by setting the Y value in a specific range, the above-described luminance unevenness and light leakage at the end can be improved. The present invention has been achieved.
- the light diffusing sheet of the present invention is a light diffusing sheet having a light diffusing layer, and the light diffusing layer includes a binder resin, light diffusing resin particles, and inorganic fine particles, and the light
- the diffusive sheet is characterized in that a Y value according to a transmission measurement method of a D65 light source of JIS Z 8722: 2000 is 0.3 or more and 2.1 or less.
- the light diffusing sheet of the present invention is based on the above characteristics, and the inorganic fine particles and the binder can take the following modes.
- the inorganic fine particle is a high refractive index metal oxide having a higher refractive index than that of the binder resin.
- the refractive index of the inorganic fine particles is 1.9 or more.
- the high refractive index metal oxide is at least one selected from zirconium oxide, titanium oxide, and zinc oxide.
- the inorganic fine particles are zirconium oxide, and are contained in 120 to 320 parts by weight with respect to 100 parts by weight of the binder resin (solid content).
- the binder resin contains an acrylic polyol resin having a glass transition temperature of 30 ° C. or lower.
- the binder resin further contains an acrylic polyol resin having a glass transition temperature of 40 ° C. or higher.
- the glass transition temperature is 30 ° C. or lower.
- the acrylic polyol resin is 50 parts by weight or more.
- the light diffusing sheet of the present invention is characterized in that the total light transmittance is 45% to 88%.
- the light diffusing sheet of the present invention comprises a binder resin, 60 to 120 parts by weight of light diffusing resin particles and 100 parts by weight of the binder resin (solids) with respect to 100 parts by weight of the binder resin (solids). 40 to 480 parts by weight of inorganic fine particles, the refractive index of the inorganic fine particles is 1.9 or more, and the Y value according to the transmission measurement method of the D65 light source of JIS Z 8722: 2000 is 0.3 or more and 2 0.1 or less, and the total light transmittance is 45% to 88%.
- the backlight device of the present invention is disposed on the reflective sheet, the light guide plate installed above the reflective sheet, the light source disposed on the side surface of the light guide plate, and the light emitting surface side of the light guide plate.
- a prism sheet disposed on the light emission surface side of the light diffusive sheet, and the light diffusive sheet of the present invention is used as the light diffusive sheet.
- the backlight device of the present invention is disposed above the diffusion plate, the light source, the diffusion plate disposed on one side of the light source, the reflective film disposed on the other side of the light source.
- a light diffusing sheet and a prism sheet disposed on the light emitting surface side of the light diffusing sheet are provided, and the light diffusing sheet of the present invention is used as the light diffusing sheet.
- the light diffusive sheet includes those in the form of a film, and the light diffusive sheet of the present invention is composed of a single layer of a light diffusing layer and supports a transparent substrate and the like. It includes a laminate of a light diffusion layer on the body.
- a light diffusive sheet having high light diffusibility can be provided by setting the Y value in a desired range.
- seat of this invention The schematic diagram which shows one Embodiment of the backlight apparatus using the light diffusable sheet
- the light diffusing sheet of the present invention is a light diffusing sheet having a light diffusing layer, and the light diffusing layer contains a binder resin, light diffusing resin particles, and inorganic fine particles.
- the light diffusive sheet has a Y value of 0.3 or more and 2.1 or less according to a transmission measurement method of a D65 light source of JIS Z 8722: 2000.
- the Y value which is one of the tristimulus values, takes a value from 0 to 100. The lower the Y value, the lower the luminous transmittance and the higher the concealability.
- the present invention by setting the Y value in the above-described range, it is possible to prevent uneven luminance of the display surface and light leakage without reducing the luminance of a display device or the like to which the light diffusing sheet of the present invention is applied. .
- the Y value is determined by the elements constituting the light diffusing sheet, particularly the elements constituting the light diffusing layer, and the target Y value can be realized by adjusting these.
- the target Y value can be realized by adjusting these.
- the structure of the light diffusing sheet of the present invention may be a single light diffusing layer or a structure in which a light diffusing layer is laminated on a support as long as it includes a light diffusing layer. Moreover, as long as the function of a light-diffusion layer is not inhibited, you may have another layer (a light-diffusion layer is included).
- the light diffusing sheet of this embodiment may include a light diffusing layer 11, a support 12, and a backcoat layer.
- the light diffusion layer includes at least a binder resin, light diffusing resin particles, and inorganic fine particles.
- binder resin for the light diffusion layer examples include ionizing radiation curable resins, thermosetting resins, and thermoplastic resins.
- ionizing radiation curable resin a photopolymerizable prepolymer that can be crosslinked and cured by irradiation with ionizing radiation (ultraviolet ray or electron beam) can be used.
- An acrylic prepolymer having at least one acryloyl group and having a three-dimensional network structure by crosslinking and curing is particularly preferably used.
- the acrylic prepolymer urethane acrylate, polyester acrylate, epoxy acrylate, melamine acrylate, polyfluoroalkyl acrylate, silicone acrylate and the like can be used.
- these acrylic prepolymers can be used alone, but it is preferable to add a photopolymerizable monomer in order to improve the cross-linking curability and further improve the hardness of the light diffusion layer.
- photopolymerizable monomers examples include monofunctional acrylic monomers such as 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and butoxyethyl acrylate, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, and diethylene glycol.
- bifunctional acrylic monomer such as diacrylate, polyethylene glycol diacrylate, hydroxypivalate ester neopentyl glycol diacrylate, etc.
- polyfunctional acrylic monomer such as dipentaerythritol hexaacrylate, trimethylpropane triacrylate, pentaerythritol triacrylate, or the like Two or more are used.
- additives such as a photopolymerization initiator and a photopolymerization accelerator when curing by ultraviolet irradiation.
- photopolymerization initiator examples include acetophenone, benzophenone, Michler's ketone, benzoin, benzylmethyl ketal, benzoylbenzoate, ⁇ -acyloxime ester, thioxanthone and the like.
- the photopolymerization accelerator can reduce the polymerization obstacle due to air during curing and increase the curing speed.
- p-dimethylaminobenzoic acid isoamyl ester p-dimethylaminobenzoic acid ethyl ester, etc.can be mentioned.
- Thermosetting resins include silicone resins, phenolic resins, urea resins, melamine resins, furan resins, unsaturated polyester resins, epoxy resins, diallyl phthalate resins, guanamine resins, ketone resins, Examples include amino alkyd resins, urethane resins, acrylic resins, and polycarbonate resins. These can be used alone, but it is desirable to add a curing agent in order to further improve the crosslinkability and the hardness of the crosslinked cured coating film.
- a compound such as polyisocyanate, amino resin, epoxy resin, carboxylic acid or the like can be appropriately used in accordance with a suitable resin.
- thermoplastic resins ABS resin, norbornene resin, silicone resin, nylon resin, polyacetal resin, polycarbonate resin, modified polyphenylene ether resin, polybutylene terephthalate, polyethylene terephthalate, sulfone resin, imide resin, fluorine resin Resin, styrene resin, acrylic resin, vinyl chloride resin, vinyl acetate resin, vinyl chloride-vinyl acetate copolymer resin, polyester resin, urethane resin, rubber resin, polyvinyl ether, polyvinyl alcohol, polyvinyl butyral , Polyvinyl pyrrolidone, polyethylene glycol and the like.
- thermosetting resins or thermoplastic resins acrylic resin thermosetting resins or from the viewpoint of obtaining coating film strength and good transparency when used as a resin layer It is preferable to use a thermoplastic resin.
- thermosetting resins or thermoplastic resins can also be used as composite resins in which a plurality of types are combined.
- the binder resin can adjust the properties of the light diffusion layer by adjusting the glass transition temperature (Tg).
- the binder resin preferably has a low glass transition temperature (Tg).
- those having a low glass transition temperature (Tg) have a glass transition temperature of 30 ° C. or lower, preferably 20 ° C. or lower.
- the binder resin preferably includes a resin having a high glass transition temperature (Tg).
- those having a high glass transition temperature (Tg) have a glass transition temperature of 40 ° C. or higher, preferably 50 ° C. or higher.
- the binder resin having the glass transition temperature (Tg) an acrylic polyol resin is preferable.
- the glass transition temperature (Tg) of the binder resin can be adjusted by appropriately changing the type and ratio of monomer components such as an acrylic component and a styrene component in the resin, for example, in the case of an acrylic polyol resin.
- the glass transition temperature of a styrene homopolymer is 100 ° C.
- the glass transition temperature can be adjusted by selecting an acrylic monomer to be copolymerized therewith.
- acrylic monomers have a glass transition temperature 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.
- Typical examples of the acrylic component monomer include methacrylate monomers such as methyl methacrylate and ethyl methacrylate, acrylate monomers such as methyl acrylate and ethyl acrylate, hydroxyethyl methacrylate, acrylamide, and the like.
- Typical examples of the styrene monomer include styrene. As typical examples, ⁇ -methylstyrene, vinyltoluene, and the like can be given.
- styrene monomer may be graft-polymerized on the side chain of the acrylic resin or the styrene resin may be copolymerized.
- the side chain may be obtained by graft polymerization of an acrylic monomer.
- acrylic polyol resins having a glass transition temperature of 30 ° C. or lower include, for example, DIC's trade name ACRICID A811 (Tg: 19 ° C.), trade name ACRYDIC 49-394IM (Tg: 16 ° C.), trade name Examples include ACRIDIC 52-614 (Tg: 16 ° C.), and trade name ACRICID 48-261 (Tg: 30 ° C.).
- examples of commercially available acrylic polyol resins having a glass transition temperature of 40 ° C. or higher include, for example, DIC Corporation's trade name ACRICID A817 (Tg: 96 ° C.), trade name ACRICID A814 (Tg: 87 ° C.), and trade name.
- examples include ACRIDIC A815-45 (Tg: 101 ° C.) and trade name ACRICID A808 (Tg: 70 ° C.).
- the binder resin contains an acrylic polyol resin having a glass transition temperature of 30 ° C. or lower as a low glass transition temperature (Tg).
- binder resin can contain acrylic polyol resin whose glass transition temperature is 40 degreeC or more as binder resin of high glass transition temperature in addition to binder resin of low glass transition temperature.
- the mixing of the two is a resin (solid content) mixing ratio, a resin having a high glass transition temperature: a low glass transition temperature.
- the ratio of the resin is preferably in the range of 5: 5 to 0:10.
- the binder resin preferably contains 50 parts by weight or more of the resin having a low glass transition temperature.
- the acrylic polyol resin having a glass transition temperature of 30 ° C. or lower and the acrylic polyol resin having a glass transition temperature of 40 ° C. or higher is 100 parts by weight
- the acrylic polyol resin having a glass transition temperature of 30 ° C. or lower is 50 parts by weight. The above is preferable.
- the light diffusing resin particles materials generally used as light diffusing resin particles can be used. Specifically, styrene resin, urethane resin, nylon resin, benzoguanamine resin, silicone resin, acrylic resin, etc. These resin particles can also be used. Among these, it is preferable to use an acrylic resin from the viewpoint of high light transmittance and improving luminance performance. These particles can be used in combination of not only one type but also a plurality of types.
- the size of the light diffusing resin particles is preferably an average particle diameter of 0.5 to 10 ⁇ m, more preferably 1 to 8 ⁇ m.
- the average particle size is preferably an average particle diameter of 0.5 to 10 ⁇ m, more preferably 1 to 8 ⁇ m.
- the light diffusive sheet can be thinned, and by setting the average particle size to 0.5 ⁇ m or more, the light diffusibility and the front luminance can be improved.
- those having an average particle diameter of 1 to 4 ⁇ m are more preferable.
- particles having an average particle size of 1 to 4 ⁇ m and particles having a larger average particle size are preferably those having an average particle size of 4 to 10 ⁇ m, and more preferably 5 to 8 ⁇ m.
- the ratio of particles having a large average particle size in the case of combining both is preferably equal to or less than that of particles having a small average particle size, and the ratio of particularly small particles to large particles is 100: 40 to 100: 60. A range is preferred.
- the shape of the light diffusing resin particles is not particularly limited, but is preferably close to true spherical particles. With such a shape, the front luminance can be improved.
- the refractive index of the light diffusing resin particles is not particularly limited, but preferably has a small refractive index difference from the binder resin.
- the difference in refractive index between the binder resin and the particles is preferably 0.03 or less, and more preferably 0.02 or less. By setting it as such a range, it is easy to reduce the light transmission loss by the internal haze in a light-diffusion layer. Since the refractive index of the binder resin is about 1.43 to 1.57, specifically, the refractive index of the light diffusing resin particles is preferably 1.40 to 1.60, and preferably 1.45 to 1. 55 is more preferred.
- the content ratio of the light diffusing resin particles to the binder resin is preferably 60 to 220 parts by weight, more preferably 80 to 200 parts by weight, based on 100 parts by weight of the binder resin (solid content), although it depends on the average particle diameter.
- the above-described particles having a small average particle diameter are preferably 60 to 180 parts by weight with respect to 100 parts by weight of the binder resin (solid content) in order to exhibit the required light diffusibility. From the viewpoint of further improving the front luminance, it is more preferable to contain 80 to 120 parts by weight.
- the particles having a large average particle diameter are contained in an amount of 180 parts by weight within the above-mentioned ratio range (the same amount or less) with respect to the small particles. It can be added without being limited to a proportion.
- the inorganic fine particles are added in order to obtain a predetermined Y value without lowering the luminance.
- Inorganic fine particles having a higher refractive index than the binder resin are preferable, and high refractive index metal oxides and metal salts are particularly preferable.
- the refractive index of the inorganic fine particles is preferably 1.9 or more, more preferably 2.0 or more, and particularly preferably 2.3 or more. When the refractive index is increased, the reflectance of light can be increased, and a low Y value can be realized even if the amount of inorganic fine particles added is reduced. Further, when the light diffusion layer is formed on the support by reducing the amount of inorganic fine particles added, good adhesion of the light diffusion layer to the support can be maintained.
- high refractive index metal oxide or metal salt examples include lead hydroxycarbonate (2PbCO 3 Pb (OH) 2 ) (refractive index 1.94 to 2.09), titanium oxide (refractive index 2.71), zirconium oxide (refractive Preferably 2.4), zinc oxide (refractive index 1.95), aluminum oxide (refractive index 1.76) and the like.
- the inorganic fine particles preferably exhibit white color in the light diffusion layer coating film.
- the light diffusive sheet is white, the luminance unevenness near the light source of the backlight device is reduced, and the effect of making the light leakage at the end of the light guide plate inconspicuous can be enhanced.
- zirconium oxide, titanium oxide, and zinc oxide are particularly preferable as the inorganic fine particles exhibiting whiteness, and zirconium oxide and titanium oxide are particularly preferable.
- the above-described high refractive index metal oxide, metal salt, or white inorganic fine particles can be used in combination of not only one type but also a plurality of types. By combining multiple types, it becomes easy to adjust the content of the inorganic fine particles as a whole, the resulting Y value and other properties of the light diffusion layer coating film, such as adhesion to the support and anti-curl property. .
- the primary particle size of the inorganic fine particles is not particularly limited, but those having a particle size of 10 to 50 nm can be used. Such fine particles of the order of nm are mostly contained in the light diffusion layer as aggregates when dispersed in the light diffusion layer. By including the inorganic fine particles as an aggregate, it becomes easy to obtain a predetermined Y value, and an excessive dispersion step is not required, so that the liquid production step is improved.
- the average particle diameter (secondary particle diameter) as an aggregate is preferably 100 to 2000 nm from the viewpoint of obtaining high diffusibility while suppressing a decrease in luminance as much as possible by having a predetermined Y value or a predetermined whiteness. More preferably, it is ⁇ 1000 nm.
- the particle diameter of the aggregate in a light-diffusion layer can measure a coating-film cross section etc. with a transmission electron microscope (TEM).
- TEM transmission electron microscope
- the blending amount of inorganic fine particles with respect to 100 parts by weight of the binder resin is preferably 40 parts by weight to 480 parts by weight, preferably 120 parts by weight, although it depends on the type of inorganic fine particles. From the above, it is more preferably 320 parts by weight or less, and further preferably from 160 parts by weight to 240 parts by weight.
- the lower limit of the amount of the inorganic fine particles to 100 parts by weight of the binder resin (solid content) is preferably 120 parts by weight or more, more preferably 140 parts by weight or more, and further 160 parts by weight or more.
- the upper limit is preferably 320 parts by weight or less, more preferably 280 parts by weight or less, and further preferably 240 parts by weight or less.
- the lower limit of the amount of the inorganic fine particles based on 100 parts by weight of the binder resin (solid content) is preferably 40 parts by weight or more, more preferably 50 parts by weight or more, and the upper limit is 130 weights. Part or less, preferably 120 parts by weight or less, more preferably 110 parts by weight or less. By making it 40 parts by weight or more, the uniformity of luminance is improved. By making it 130 parts by weight or less, the light diffusion layer is prevented from being colored yellow.
- the lower limit value of the amount of the inorganic fine particles to 100 parts by weight of the binder resin (solid content) is preferably 200 parts by weight or more, more preferably 220 parts by weight or more, and further 240 parts by weight or more.
- the upper limit is preferably 480 parts by weight or less, more preferably 420 parts by weight or less, and still more preferably 360 parts by weight or less.
- the range of the suitable compounding quantity has shifted
- the range of the compounding quantity of the whole inorganic fine particle is according to each compounding ratio. Any intermediate range may be used.
- the total amount of both is preferably 80 to 200 parts by weight, more preferably 100 to 180 parts by weight with respect to 100 parts by weight of the binder resin (solid content).
- the light diffusion layer in addition to the binder resin, light diffusing resin particles and inorganic fine particles described above, surfactants such as leveling agents and antifoaming agents, additives such as antioxidants and ultraviolet absorbers are added. Also good.
- the thickness of the light diffusing layer is preferably 10 to 500 ⁇ m, more preferably 10 to 250 ⁇ m, when the light diffusing sheet of the present invention is composed of a single light diffusing layer.
- the thickness is preferably 2 to 20 ⁇ m, preferably 3 to 15 ⁇ m, from the viewpoint of easily obtaining the desired emission characteristics of the present invention while exhibiting the light diffusion performance. More preferably.
- the thickness of the light diffusion layer means the thickness from the tip of the convex portion of the uneven surface of the light diffusion layer to the surface of the light diffusion layer opposite to the uneven surface.
- the support can be used without particular limitation as long as the support is a plastic film having high optical transparency, as long as it does not deviate from the range of the Y value.
- polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, polystyrene, triacetyl cellulose, acrylic, polyvinyl chloride, norbornene compound and the like can be used.
- a stretched polyethylene terephthalate film particularly a biaxially stretched film, is preferred because of its excellent mechanical strength and dimensional stability.
- the thickness of the support is usually preferably about 10 to 400 ⁇ m.
- the surface of the light diffusing sheet of the present invention opposite to the uneven surface is subjected to a fine matte treatment to prevent adhesion to other members, or an antireflection treatment to improve light transmittance. You may give it. Furthermore, you may provide a backcoat layer, an antistatic layer (not shown in FIG. 1), and an adhesion layer (not shown in FIG. 1) by the following coating and drying methods.
- the basic function of the back coat layer is to prevent adhesion with the opposing member, and it can also have the ability to prevent damage to the opposing member and diffusibility.
- a back coat layer has a concavo-convex shape on the surface, and includes, for example, a binder resin and particles.
- the binder resin and particles can be the same as the binder resin and particles used in the light diffusing layer of the light diffusing sheet described above.
- an appropriate material an appropriate material can be used. It is preferred to use an amount.
- nylon resin particles and / or silicone resin particles are as follows: It is preferable from the viewpoint. These resin particles may be used not only alone but also in appropriate combination.
- the binder resin a thermosetting resin having a glass transition temperature Tg of 15 to 100 ° C. is preferably used.
- the content ratio of the particles with respect to the binder resin in the back coat layer is preferably 0.1 to 2 parts by weight with respect to 100 parts by weight of the binder resin (solid content), but may be further contained.
- the nylon resin particles are particularly good.
- the nylon resin particles preferably have an average particle diameter of 1 to 10 ⁇ m. Further, the nylon resin particles are preferably contained in an amount of 0.1 to 2 parts by weight with respect to 100 parts by weight of the thermosetting resin, but more may be contained.
- Resin particles are preferred.
- the silicone resin particles preferably have an average particle diameter of 1 to 10 ⁇ m.
- the silicone resin particles particularly preferably have a double structure in which a spherical core made of silicone rubber is covered with a silicone resin film.
- the silicone resin particles are preferably contained in an amount of 0.1 to 2 parts by weight with respect to 100 parts by weight of the thermosetting resin, but more can be contained.
- the back coat layer can be imparted with light diffusibility in addition to adhesion prevention.
- the haze of the light diffusing backcoat layer is preferably lower than the haze of the light diffusing layer from the viewpoint of improving the light diffusing property while maintaining the front luminance.
- the haze is preferably about 50% to 70%.
- the front luminance is set to be lower than the content ratio of the binder resin and the particles in the light diffusion layer. It is preferable from the viewpoint of preventing the decrease.
- the thickness of the back coat layer is generally preferably 1 to 10 ⁇ m.
- additives such as a dispersing agent, an antistatic agent, and a leveling agent, can also be suitably contained as needed.
- the antistatic layer may be a general one as long as it does not deviate from the range of the Y value, and the thickness of the antistatic layer is preferably 0.1 ⁇ m or less.
- the adhesive layer may be a general one as long as it does not deviate from the range of the Y value, and the thickness of the adhesive layer is preferably 30 ⁇ m or less.
- the light diffusing sheet of the present invention is a light diffusing layer coating solution prepared by dissolving or dispersing the above-described materials such as the binder resin and particles in an appropriate solvent, a back coating layer coating solution provided as necessary, and the like. Is applied on a support by a conventionally known method, for example, a bar coater, a blade coater, a spin coater, a roll coater, a gravure coater, a flow coater, a die coater, spraying, screen printing or the like, and dried. be able to. Moreover, it can also be set as the light diffusable sheet which consists of a single light-diffusion layer by peeling and removing the said support body from what formed the light-diffusion layer on the support body.
- the light diffusing sheet of the present invention reduces the luminance as much as possible in the backlight device by setting the Y value to 0.3 or more and 2.1 or less based on the transmission measurement method of D65 light source of JIS Z 8722: 2000. While suppressing, it can be set as the light diffusable sheet which can improve local brightness nonuniformity and local light leakage. If the measured Y value is too low, the light shielding property becomes high.
- the lower limit value of the Y value is preferably 0.3 or more, more preferably 0.4 or more, and 0.45 or more. More preferred is 0.5 or more.
- the upper limit of the Y value is preferably 2.1 or less, more preferably 1.8 or less, further preferably 1.5 or less. .2 or less is particularly preferable.
- the light diffusing sheet of the present invention is preferably so-called white so that the light from the light source is not tinted.
- the inorganic fine particles preferably exhibit white in the light diffusion layer coating film.
- the preferable range of the whiteness of the light diffusing sheet of the present invention is preferably 0.30 or more, more preferably 0.31 as the lower limit of the x value of Yxy according to the transmission measurement method of D65 light source of JIS Z 8722: 2000.
- the lower limit of the y value is preferably 0.31 or more, more preferably 0.32 or more, and the upper limit of the x value is preferably 0.36 or less, more preferably 0.35 or less, and the upper limit of the y value. Is preferably 0.37 or less, more preferably 0.36 or less.
- the lower limit of the range of the total light transmittance measured based on the JIS K 7105 measurement method is preferably 45% or more, more preferably 54% or more, and further preferably 60% or more.
- the upper limit is preferably 88% or less, more preferably 84% or less, and even more preferably 80% or less.
- the light diffusive sheet of the present invention decreases the total light transmittance as the Y value is kept low, but the luminance value when incorporated in a backlight device is higher than that of a high total light transmittance. Almost does not go down. The reason is considered as follows.
- the whiteness becomes strong and the total light transmittance itself decreases due to the decrease in the Y value.
- the light diffusing sheet of the present invention is incorporated in a backlight device, the light incident on the sheet is repeatedly reflected on the surface of a large number of inorganic fine particles dispersed in the light diffusing layer.
- the inorganic fine particles used in the present invention have a high refractive index, that is, a high reflectivity, and it is considered that light transmission and absorption hardly occur in the fine particle portion.
- the incident light that has been repeatedly reflected cannot be emitted in the front direction at first, the incident light is emitted in the front direction or reflected by the reflection sheet 36 installed on the back surface of the backlight device while the reflection is repeated. Eventually, almost all of the incident light rays are emitted in the front direction without loss, so it is considered that the front luminance is maintained high.
- the backlight device can be applied to either a direct type structure or an edge light type structure. Further, it may be used for either large or small liquid crystal displays.
- FIG. 2 shows an edge light type backlight device 30 as an embodiment of a backlight device using the light diffusing sheet of the present invention.
- This backlight device is mainly disposed on the light guide plate 35, the light source 34 disposed at one end thereof, the reflection sheet 36 disposed below the light guide plate 35, and the light guide plate 35.
- a light diffusing sheet 33 and prism sheets 31 and 32 are provided. 2 shows a case where one light diffusive sheet 33 and two prism sheets 31 and 32 are used. However, only one sheet may be used, or a plurality of sheets may be used in a stacked manner. Good.
- the light guide plate 35 has a substantially flat plate shape 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 polymethylmethacrylate, polycarbonate, It consists of matrix resin chosen from highly transparent resin, such as an amorphous olefin resin. If necessary, resin particles having a refractive index different from that of the matrix resin may be added.
- Each surface of the light guide plate may have a complicated surface shape instead of a uniform plane, or may be provided with light diffusion printing such as a dot pattern.
- the light source 34 is disposed at least at one end of the light guide plate 35, and a cold cathode tube, an LED light source, or the like is mainly used.
- Examples of the shape of the light source include a dot shape, a line shape, and an L shape.
- the reflection sheet 36 is disposed under the light guide plate 35.
- the reflective sheet is not particularly limited as long as the luminance value is not lowered.
- a metallic glossy reflection sheet on which silver vapor deposition or aluminum is supported is preferably used.
- Prism sheets 31 and 32 are disposed on the light diffusing sheet 33.
- a conventionally known prism sheet may be used as long as the luminance value is not lowered.
- the backlight device is provided with a polarizing film, an electromagnetic wave shielding film, and the like depending on the purpose in addition to the prism sheet, the light diffusing sheet, the light guide plate, the reflection sheet, and the light source.
- the backlight device 30 of the present embodiment includes the light guide plate 35 and the light source 34 disposed at least at one end of the light guide plate 35, and the light of the present invention described above on the light output surface of the light guide plate 35. Since the diffusive sheet 33 and the prism sheets 31 and 32 are provided in this order, even if the frame of the display screen of the backlight device is narrowed, the luminance is not so lowered as compared with the conventional backlight device, and the vicinity of the light source 34 is reduced. Luminance unevenness can be reduced and light leakage at the end of the light guide plate 35 can be made inconspicuous.
- FIG. 3 shows a direct-type backlight device 50 as another embodiment of the backlight device using the light diffusing sheet of the present invention.
- This backlight device has, as a main configuration, a reflection film 56 housed in a chassis 55, a plurality of light sources 54 disposed on the reflection film 56, and a light diffusion plate 53 on the light diffusion plate 53.
- the sheet 52 has a structure in which a prism sheet 51 is disposed. Note that FIG. 3 shows a case where one light diffusing sheet 52 and one prism sheet 51 are used, but a plurality of each may be used in an overlapping manner.
- the diffusion plate 53 is installed on the light source of the direct type backlight device, has a role of reducing the pattern of the light source, and is mainly made of synthetic resin. Such a diffusion plate needs to be as thick as 1 to 10 mm in order to simply have light diffusibility, and supports the light diffusive sheet, which is different from the light diffusive sheet of the present invention.
- Synthetic resins constituting the diffusion plate 53 include polyester resins, acrylic resins, acrylic urethane resins, polyester acrylate resins, polyurethane acrylate resins, epoxy acrylate resins, urethane resins, epoxy resins, polycarbonate resins. , Cellulosic resin, Acetal resin, Polyethylene resin, Polystyrene resin, Polyamide resin, Polyimide resin, Melamine resin, Phenol resin, Silicone resin and other thermoplastic resins, Thermosetting resin, Ionizing radiation curing Resin etc. are mentioned. Among these, acrylic resins having excellent optical properties are preferably used.
- fine particles are added to impart light diffusibility.
- fine particles silica, clay, talc, calcium carbonate, calcium sulfate, barium sulfate, aluminum silicate, titanium oxide, synthetic zeolite, alumina, smectite and other inorganic fine particles, styrene resin, urethane resin, benzoguanamine resin, silicone resin, Organic fine particles made of acrylic resin and the like can be mentioned.
- the light source 54 a cold cathode tube, an LED light source or the like is mainly used.
- Examples of the shape of the light source include a dot shape, a line shape, and an L shape.
- the reflective film 56 may be disposed under the light source 54. There is no particular limitation as long as the luminance value is not lowered. Specifically, a white film is preferably used.
- the prism sheet 51 may be disposed on the light diffusing sheet of the present invention. As long as the luminance value is not lowered, a conventionally known one may be used.
- the chassis 55 may be a conventionally known one used for a direct type backlight device.
- the backlight device not only the light diffusing sheet of the present invention but also conventionally known optical members can be used in appropriate combination.
- the backlight device includes a reflecting plate, a polarizing film, an electromagnetic wave shielding film, and the like depending on the purpose.
- a light diffusing sheet 52 of the present invention is disposed through a reflection film 56, a plurality of light sources 54 disposed on the reflection film 56, and the reflection film 53 accommodated in the chassis 55. Since the prism sheet 51 is further arranged, even if the frame of the display screen of the backlight device is narrowed, the luminance is not so much lower than that of the conventional backlight device, Luminance unevenness near the light source 54 can be reduced and light leakage at the end of the diffusion plate 53 can be made inconspicuous.
- the present invention is characterized by a light diffusing sheet, and the present invention is a backlight device other than the above-described embodiment or a light source device other than the backlight device as long as the light diffusing sheet of the present invention is used.
- the present invention can also be applied as appropriate.
- Example 1 Production of Light Diffusing Sheet ⁇ Example 1> After mixing and stirring the coating solution for the light diffusing layer having the following formulation, on a support made of a polyethylene terephthalate film (Lumirror T60: Toray Co., Ltd.) having a thickness of 23 ⁇ m, by a bar coating method so that the thickness after drying becomes 5 ⁇ m. The light diffusion layer was formed by coating and drying. Then, on the surface opposite to the surface on which the light diffusion layer of the support is formed, the back coating layer coating liquid having the following formulation is applied by a bar coating method so that the thickness after drying is 5 ⁇ m, and dried. A back coat layer was formed to obtain the light diffusive sheet of Example 1.
- a polyethylene terephthalate film Limirror T60: Toray Co., Ltd.
- Acrylic polyol resin 4 parts (Acridic A-817: DIC, solid content 50%, Tg 96 ° C., refractive index 1.51)
- Acrylic polyol resin 6 parts (Acridic A-811: DIC, solid content 50%, Tg 19 ° C., refractive index 1.49)
- Polyisocyanate 2 parts (Takenate D110N: Mitsui Chemicals, solid content 60%)
- Acrylic resin particles 10 parts Polymethylmethacrylate true spherical particles, average particle size 2 to 3 ⁇ m, refractive index 1.49) -Zirconium dioxide 14.4 parts (zirconium oxide PCS: Nippon Electric Works, primary particle diameter 20 nm, refractive index 2.40, specific gravity 6) ⁇ 94 parts of diluted solvent
- Example 1 ⁇ Backcoat layer coating solution of Example 1> ⁇ Acrylic polyol resin 10 parts (Acridic A-807: DIC, solid content 50%) Polyisocyanate 2 parts (Takenate D110N: Mitsui Chemicals, solid content 60%) ⁇ Nylon resin particles 0.1 parts (Nylon resin true spherical particles: average particle size 5 ⁇ m) ⁇ 38 parts of diluted solvent
- Example 2 A light diffusable sheet of Example 2 was obtained in the same manner as in Example 1 except that the weight part of zirconium dioxide was changed to 16.8 parts of the coating solution for light diffusing layer of Example 1.
- Example 3 A light diffusable sheet of Example 3 was obtained in the same manner as in Example 1 except that the weight part of zirconium dioxide was changed to 19.2 parts of the coating solution for light diffusing layer of Example 1.
- Example 4 A light diffusable sheet of Example 4 was obtained in the same manner as Example 1 except that the weight part of zirconium dioxide was changed to 21.6 parts of the coating solution for light diffusing layer of Example 1.
- Example 5 A light diffusable sheet of Example 5 was obtained in the same manner as in Example 1 except that, in the coating solution for light diffusing layer of Example 1, the weight part of zirconium dioxide was changed to 24.0 parts.
- Example 6 A light diffusing sheet of Example 6 was obtained in the same manner as in Example 1 except that the coating solution for the light diffusing layer of Example 1 was changed to the following formulation.
- ⁇ Coating liquid for light diffusion layer coating film of Example 6> Acrylic polyol resin 10 parts (Acridic A-811: DIC, solid content 50%, Tg 19 ° C., refractive index 1.49) Polyisocyanate 2 parts (Takenate D110N: Mitsui Chemicals, solid content 60%) ⁇ Acrylic resin particles 10 parts (Polymethylmethacrylate true spherical particles, average particle size 2 to 3 ⁇ m, refractive index 1.49) ⁇ Zirconium dioxide 24.0 parts (zirconium oxide PCS: Nippon Electric Works, primary particle diameter 20 nm, refractive index 2.40, specific gravity 6) ⁇ 94 parts of diluted solvent
- Example 7 A light diffusable sheet of Example 7 was obtained in the same manner as Example 6 except that the weight part of zirconium dioxide was changed to 26.4 parts of the coating solution for light diffusing layer of Example 6.
- Example 8 A light diffusable sheet of Example 8 was obtained in the same manner as Example 6 except that the weight part of zirconium dioxide was changed to 28.8 parts of the coating solution for light diffusing layer of Example 6.
- Example 9 A light diffusable sheet of Example 9 was obtained in the same manner as in Example 6 except that the weight part of zirconium dioxide was changed to 33.6 parts of the coating solution for the light diffusing layer of Example 6.
- Example 10 A light diffusable sheet of Example 10 was obtained in the same manner as in Example 6 except that the light diffusion layer coating liquid of Example 6 was changed to 38.4 parts by weight of zirconium dioxide.
- zirconium dioxide is titanium dioxide (rutile TiO 2 ) (Tronox R-KB-2, Bayer, primary particle diameter 20 nm, refractive index 2.71, specific gravity 4.
- the light diffusable sheet of Example 11 was obtained in the same manner as in Example 6 except that the weight part was changed to 3) and the weight part was changed to 7.2 parts.
- Example 12 Of the coating solution for the light diffusing layer of Example 6, zirconium dioxide was changed to titanium dioxide similar to that used in Example 11, and the parts by weight were changed to 14.4 parts. Similarly, a light diffusing sheet of Example 12 was obtained.
- Example 13 Of the coating solution for the light diffusion layer of Example 6, zirconium dioxide was changed to zinc oxide (Nanofine 50A, Sakai Chemical Industry, primary particle diameter 20 nm, refractive index 1.95, specific gravity 5.6), and the weight part was changed. A light diffusing sheet of Example 13 was obtained in the same manner as Example 6 except that the content was changed to 28.8 parts.
- Example 14 Of the coating solution for the light diffusing layer of Example 6, zirconium dioxide was changed to zinc oxide similar to the zinc oxide used in Example 13, and the parts by weight were changed to 57.6 parts. Similarly, a light diffusing sheet of Example 14 was obtained.
- Comparative Example 1 A light diffusable sheet of Comparative Example 1 was obtained in the same manner as in Example 6 except that the weight part of zirconium dioxide in the coating solution for light diffusing layer of Example 6 was changed to 12.0 parts.
- Example 15 A light diffusing sheet was prepared in the same manner as in Example 1 except that the light diffusion layer coating liquid of Example 1 was changed to the following formulation. Among the following formulations, only the content M of acrylic resin particles (small particles) was changed to 11.2 parts, 14.4 parts, 18 parts, and 21.6 parts to obtain four types of light diffusive sheets. .
- Acrylic polyol resin 10 parts (Acridic A-811: DIC, solid content 50%, Tg 19 ° C., refractive index 1.49) Polyisocyanate 2 parts (Takenate D110N: Mitsui Chemicals, solid content 60%) ⁇ Acrylic resin particles (small particles) M part (polymethylmethacrylate true spherical particles, average particle diameter of 2 to 3 ⁇ m, refractive index of 1.49) Acrylic resin particles (large particles) 4.8 parts (polymethyl methacrylate true spherical particles, average particle diameter 5 ⁇ m, refractive index 1.49) 6 parts of titanium dioxide (rutile TiO 2 ) (Tronox R-KB-2, Bayer, primary particle diameter 20 nm, refractive index 2.71, specific gravity 4.3) 94 parts diluted solvent
- Example 16 A light diffusing sheet was prepared in the same manner as in Example 15 except that the light diffusion layer coating liquid of Example 15 was changed to the following formulation.
- the zirconium dioxide content L is fixed to 7.2 parts
- the titanium dioxide content N is varied to 4.8 parts, 5.4 parts, and 6 parts.
- Three types of light diffusing sheets were obtained.
- Acrylic polyol resin 10 parts (Acridic A-811: DIC, solid content 50%, Tg 19 ° C., refractive index 1.49) Polyisocyanate 2 parts (Takenate D110N: Mitsui Chemicals, solid content 60%) ⁇ Acrylic resin particles (small particles) 9.6 parts (polymethyl methacrylate true spherical particles, average particle diameter of 2 to 3 ⁇ m, refractive index of 1.49) Acrylic resin particles (large particles) 4.8 parts (polymethyl methacrylate true spherical particles, average particle diameter 5 ⁇ m, refractive index 1.49) ⁇ Zirconium dioxide L part (Zirconium oxide PCS: NIPPON Denko, primary particle diameter 20 nm, refractive index 2.40, specific gravity 6) Titanium dioxide (rutile TiO 2 ) N part (Tronox R-KB-2, Bayer, primary particle diameter 20 nm, refractive index 2.71,
- Example 17-19> A plurality of light diffusing sheets having the same formulation as in Example 16 and different proportions of two kinds of inorganic fine particles (zirconium dioxide and titanium dioxide) were prepared.
- the content N of titanium dioxide in the formulation of Example 16 was fixed to 2.4 parts, and the content L of zirconium dioxide was 9.6 parts, 12 parts, 14.4 parts, 16.8 parts.
- Example 18 the content N of titanium dioxide in the formulation of Example 16 was fixed at 3.6 parts, and the content L of zirconium dioxide was varied from 9.6 parts, 12 parts, and 14.4 parts. .
- Example 19 the content N of titanium dioxide in the formulation of Example 16 was fixed to 4.8 parts, and the content L of zirconium dioxide was 8.4 parts, 9.6 parts, 12 parts, 14.4 parts. , 16.8 parts.
- Example 20 In the coating solution for the light diffusion layer of Example 16, the content L of zirconium dioxide and the content N of titanium dioxide were 9.6 parts and 4.8 parts, respectively (14.4 parts as the content of inorganic fine particles).
- a plurality of light diffusing sheets were prepared by fixing and varying the ratio of small particles and large particles of acrylic resin particles.
- the large particle content was fixed at 4.8 parts, the same as in Example 16, and the small particle content was changed to 4.8 parts and 7.2 parts.
- Example 21 the content of small particles was fixed at 9.6 parts as in Example 16, and the content of large particles was changed to 2.4 parts and 3.6 parts.
- the light diffusive sheets of Examples 1 to 21 and Comparative Examples 1 to 7 were used as 4-inch edge light type backlights (8 LED light sources with a luminous intensity of 1300 mcd, made of polycarbonate with a thickness of 0.5 mm).
- the back coat layer of the light diffusive sheet is incorporated so as to face the light guide plate, and the first prism sheet (TBEF2-) having a thickness of 65 ⁇ m is further formed on the light diffusive layer of the light diffusive sheet.
- Luminance uniformity evaluation by visual observation In the backlight device produced in the above-mentioned "Production of Backlight Device", the two prism sheets were removed and turned on (only with the light diffusing sheet), and Examples 1 to 14 and Comparative Example The light diffusive sheets 1 to 7 were visually evaluated for luminance unevenness near the light source and light leakage at the edge of the light guide plate.
- the evaluation is that the pattern of the LED light source (point light source) is not visible from a distance of 30 cm almost vertically from the light emitting surface of the backlight device, and there is no light leakage at the end of the light emitting surface, and the entire display surface Is shown as “ ⁇ ”, and the LED light source pattern is seen, or light leakage at the end is seen and the whole display surface is not seen uniformly as “x”.
- Evaluation Table 1 shows the measurement results for Examples 1 to 14 and Comparative Examples 1 to 7.
- Table 2 shows the results of a typical example.
- the amount (phr) is the parts by weight of the inorganic fine particles with respect to 100 parts by weight of the binder resin (solid content).
- the amount of polyisocyanate as a curing agent is included in 100 parts by weight of the binder resin (solid content).
- Example 5 When Example 5 and Example 6 (not including a resin having a high glass transition temperature in the binder resin) were compared, Example 5 showed some concave curls on the light diffusion layer side, but there was no problem in actual use. There wasn't. On the other hand, the evaluation of Table 1 and various physical properties of Example 6 were the same as those of Example 5, but no curling occurred.
- the light diffusable sheets of Examples 1 to 21 were visually white. Therefore, regarding Example 8 and Example 12 as representatives, the x value (small x value) and y value (small y value) of “Yxy” in the CIE-XYZ color system are set to “3. Measurement of Y value”. The same measurement was performed with the color meter described in the section. As a result, the x value of Example 8 was 0.3344, the y value was 0.3430, the x value of Example 12 was 0.3308, and the y value was 0.3433. From the measurement results of the x value and the y value, it was found that the light diffusive sheet of the present invention including Examples 8 and 12 exhibited white in the CIE-XYZ color system. When comparing the light diffusing sheets Examples 1 to 10 containing zirconium dioxide with the light diffusing sheet of Example 12 containing titanium dioxide, the sheets of Examples 1 to 10 are more preferable than the sheets of Example 12. The whiteness was higher.
- Comparative Example 1 to Comparative Example 4 have a Y value outside the range of 0.3 to 2.1, luminance unevenness near the light source and light leakage at the end of the light guide plate were not improved.
- Comparative Example 5 to Comparative Example 7 improved luminance unevenness in the vicinity of the light source and light leakage at the end of the light guide plate, the Y value was outside the range of 0.3 to 2.1. .
- Comparative Example 5 curling on the light diffusing layer side occurred and was not suitable for actual use.
- Comparative Example 6 curling did not occur, but the light diffusion layer was colored yellow and was not suitable for actual use.
- Comparative Example 7 curling occurred and coating film adhesion was poor.
- Example 15 is an example in which titanium dioxide is used as the inorganic fine particles, and two types of resin particles (referred to as small particles and large particles) having different average particle diameters are used as the light diffusing resin particles.
- the total amount of acrylic resin particles in Example 15 is larger than that in Example 11, the content of titanium dioxide is small (Example 11 is 100 parts of binder resin).
- 60 parts for Example 15 and 50 parts for Example 15 were 50 parts for 100 parts of binder resin), the total light transmittance increased from Example 11, and the average of the four types was about 65% or more.
- the Y value is also in a range of approximately 1.0 ⁇ 0.1, and sufficient luminance uniformity can be achieved.
- the Y value was kept in a desired range even when large particles for preventing scratches were added.
- the Y value tended to decrease with an increase in the content of small particles mainly contributing to light diffusibility, but an appropriate Y value can be maintained within a suitable small particle content range.
- the horizontal axis represents the content of light diffusing resin particles as small particles (parts relative to 100 parts of binder resin).
- Example 16 is an example in which titanium dioxide was used in combination under the condition that the amount of zirconium dioxide in the inorganic fine particles was small (7.2 parts: 60 parts with respect to 100 parts of binder).
- the Y value decreased from 0.98 to 0.86, but both maintained a high luminance ratio and had a total light transmittance of 65% or more. I was able to keep it. That is, the effect of the present invention that the hiding property is increased without lowering the luminance ratio was confirmed.
- Example 1 Compared with Example 1 using only zirconium dioxide, the Y value decreased despite the small content of inorganic fine particles. From this result, it can be seen that high luminance uniformity can be achieved without increasing the content by using zirconium dioxide and titanium dioxide together.
- Examples 17 to 19 are examples in which changes in the Y value were examined based on the knowledge of Example 16 when the ratios of titanium dioxide and zirconium dioxide were varied.
- FIG. 5 shows changes in the Y value when the proportions of these two types of inorganic fine particles are varied.
- the horizontal axis represents the total content of two types of inorganic fine particles (parts relative to 100 parts of binder resin).
- FIG. 5 shows changes in the Y value of the light diffusing sheets of Examples 1 to 4 (four examples having different zirconium dioxide contents).
- the change in the Y value depending on the content can be made smoother than when one type of inorganic fine particles is used. It can be seen that the value is easy to adjust.
- inorganic particles that require a relatively large content for example, zirconium dioxide
- inorganic particles with a relatively small content for example, titanium dioxide
- Example 20 and Example 21 the content of the two kinds of inorganic fine particles was fixed to 14.4 parts (120 parts with respect to 100 parts of the binder resin), and the ratio and total amount of the two kinds of light diffusing resin particles were The content is different. From the results of Examples 20 and 21, even if the amount of light diffusing particles (particularly the content of small particles) is small, the Y value is about 1.16 at the maximum if the inorganic fine particles are in an appropriate range. It was confirmed that homogenization could be achieved.
Abstract
Description
無機微粒子の屈折率が1.9以上である。
高屈折率金属酸化物が、酸化ジルコニウム、酸化チタン、および酸化亜鉛から選ばれる一種以上である。
無機微粒子が、酸化ジルコニウムであり、前記バインダー樹脂(固形分)100重量部に対し、120~320重量部含まれる。
バインダー樹脂が、さらに、ガラス転移温度が40℃以上のアクリルポリオール樹脂を含む。
ガラス転移温度が30℃以下のアクリルポリオール樹脂(固形分)と前記ガラス転移温度が40℃以上のアクリルポリオール樹脂(固形分)の合計が100重量部の場合に、前記ガラス転移温度が30℃以下のアクリルポリオール樹脂が50重量部以上である。
上述した高屈折率金属酸化物や金属塩、或いは白色無機微粒子は、1種だけでなく、複数種を組み合わせて使用することもできる。複数種組み合わせることにより、無機微粒子全体としての含有量や、その結果としてのY値やそれ以外の光拡散層塗膜の性質、例えば、支持体に対する接着性やカール防止性などが調整しやすくなる。
<実施例1>
下記処方の光拡散層用塗布液を混合し撹拌した後、厚み23μmのポリエチレンテレフタレートフィルム(ルミラーT60:東レ社)からなる支持体上に、乾燥後の厚みが5μmとなるようにバーコーティング法により塗布、乾燥して光拡散層を形成した。次いで、当該支持体の光拡散層が形成された面とは反対面に、下記処方のバックコート層用塗布液を乾燥後の厚みが5μmとなるようにバーコーティング法により塗布、乾燥して、バックコート層を形成し、実施例1の光拡散性シートを得た。
・アクリルポリオール樹脂 4部
(アクリディックA-817:DIC社、固形分50%、Tg96℃、屈折率1.51)
・アクリルポリオール樹脂 6部
(アクリディックA-811:DIC社、固形分50%、Tg19℃、屈折率1.49)
・ポリイソシアネート 2部
(タケネートD110N:三井化学社、固形分60%)
・アクリル樹脂粒子 10部
(ポリメチルメタクリレート真球状粒子、平均粒子径2~3μm、屈折率1.49)
・二酸化ジルコニウム 14.4部
(酸化ジルコニウムPCS:日本電工社、一次粒子径20nm、屈折率2.40、比重6)
・希釈溶剤 94部
・アクリルポリオール樹脂 10部
(アクリディックA-807:DIC社、固形分50%)
・ポリイソシアネート 2部
(タケネートD110N:三井化学社、固形分60%)
・ナイロン樹脂粒子 0.1部
(ナイロン樹脂真球状粒子:平均粒子径5μm)
・希釈溶剤 38部
実施例1の光拡散層用塗布液のうち、二酸化ジルコニウムの重量部を16.8部に変更した以外は、実施例1と同様にして、実施例2の光拡散性シートを得た。
実施例1の光拡散層用塗布液のうち、二酸化ジルコニウムの重量部を19.2部に変更した以外は、実施例1と同様にして、実施例3の光拡散性シートを得た。
実施例1の光拡散層用塗布液のうち、二酸化ジルコニウムの重量部を21.6部に変更した以外は、実施例1と同様にして、実施例4の光拡散性シートを得た。
実施例1の光拡散層用塗布液のうち、二酸化ジルコニウムの重量部を24.0部に変更した以外は、実施例1と同様にして、実施例5の光拡散性シートを得た。
実施例1の光拡散層用塗布液を下記処方に変更した以外は、実施例1と同様にして、実施例6の光拡散性シートを得た。
<実施例6の光拡散層塗膜用塗布液>
・アクリルポリオール樹脂 10部
(アクリディックA-811:DIC社、固形分50%、Tg19℃、屈折率1.49)
・ポリイソシアネート 2部
(タケネートD110N:三井化学社、固形分60%)
・アクリル樹脂粒子 10部
(ポリメチルメタクリレート真球状粒子、平均粒子径2~3μm、屈折率1.49)
・二酸化ジルコニウム 24.0部
(酸化ジルコニウムPCS:日本電工社、一次粒子径20nm、屈折率2.40、比重6)
・希釈溶剤 94部
実施例6の光拡散層用塗布液のうち、二酸化ジルコニウムの重量部を26.4部に変更した以外は、実施例6と同様にして、実施例7の光拡散性シートを得た。
実施例6の光拡散層用塗布液のうち、二酸化ジルコニウムの重量部を28.8部に変更した以外は、実施例6と同様にして、実施例8の光拡散性シートを得た。
実施例6の光拡散層用塗布液のうち、二酸化ジルコニウムの重量部を33.6部に変更した以外は、実施例6と同様にして、実施例9の光拡散性シートを得た。
実施例6の光拡散層用塗布液のうち、二酸化ジルコニウムの重量部を38.4部に変更した以外は、実施例6と同様にして、実施例10の光拡散性シートを得た。
実施例6の光拡散層用塗布液のうち、二酸化ジルコニウムを二酸化チタン(ルチル型TiO2)(トロノックスR-KB-2、バイエル社、一次粒子径20nm、屈折率2.71、比重4.3)に変更し、重量部を7.2部に変更した以外は、実施例6と同様にして、実施例11の光拡散性シートを得た。
実施例6の光拡散層用塗布液のうち、二酸化ジルコニウムを実施例11で使用した二酸化チタンと同様の二酸化チタンに変更し、重量部を14.4部に変更した以外は、実施例6と同様にして、実施例12の光拡散性シートを得た。
実施例6の光拡散層用塗布液のうち、二酸化ジルコニウムを酸化亜鉛(ナノファイン50A、境化学工業、一次粒子径20nm、屈折率1.95、比重5.6)に変更し、重量部を28.8部に変更した以外は、実施例6と同様にして、実施例13の光拡散性シートを得た。
実施例6の光拡散層用塗布液のうち、二酸化ジルコニウムを実施例13で使用した酸化亜鉛と同様の酸化亜鉛に変更し、重量部を57.6部に変更した以外は、実施例6と同様にして、実施例14の光拡散性シートを得た。
実施例6の光拡散層用塗布液のうち、二酸化ジルコニウムの重量部を12.0部に変更した以外は、実施例6と同様にして、比較例1の光拡散性シートを得た。
実施例6の光拡散層用塗布液のうち、二酸化ジルコニウムの重量部を9.6部に変更した以外は、実施例6と同様にして、比較例2の光拡散性シートを得た。
実施例6の光拡散層用塗布液のうち、二酸化ジルコニウムを実施例13で使用した酸化亜鉛と同様の酸化亜鉛に変更し、重量部を14.4部に変更した以外は、実施例6と同様にして、比較例3の光拡散性シートを得た。
実施例6の光拡散層用塗布液のうち、二酸化ジルコニウムを実施例13で使用した酸化亜鉛と同様の酸化亜鉛に変更し、重量部を7.2部に変更した以外は、実施例6と同様にして、比較例4の光拡散性シートを得た。
実施例6の光拡散層用塗布液のうち、二酸化ジルコニウムの重量部を48.0部に変更した以外は、実施例6と同様にして、比較例5の光拡散性シートを得た。
実施例6の光拡散層用塗布液のうち、二酸化ジルコニウムを実施例11で使用した二酸化チタンと同様の二酸化チタンに変更し、重量部を28.8部に変更した以外は、実施例6と同様にして、比較例6の光拡散性シートを得た。
実施例6の光拡散層用塗布液のうち、二酸化ジルコニウムを実施例13で使用した酸化亜鉛と同様の酸化亜鉛に変更し、重量部を72.0部に変更した以外は、実施例6と同様にして、比較例7の光拡散性シートを得た。
実施例1の光拡散層用塗布液を下記処方に変更した以外は、実施例1と同様にして、光拡散性シートを作成した。下記処方のうち、アクリル樹脂粒子(小粒子)の含有量Mのみを、11.2部、14.4部、18部、21.6部に異ならせて4種の光拡散性シートを得た。
・アクリルポリオール樹脂 10部
(アクリディックA-811:DIC社、固形分50%、Tg19℃、屈折率1.49)
・ポリイソシアネート 2部
(タケネートD110N:三井化学社、固形分60%)
・アクリル樹脂粒子(小粒子) M部
(ポリメチルメタクリレート真球状粒子、平均粒子径2~3μm、屈折率1.49)
・アクリル樹脂粒子(大粒子) 4.8部
(ポリメチルメタクリレート真球状粒子、平均粒子径5μm、屈折率1.49)
・二酸化チタン(ルチル型TiO2) 6部
(トロノックスR-KB-2、バイエル社、一次粒子径20nm、屈折率2.71、比重4.3)
希釈溶剤 94部
実施例15の光拡散層用塗布液を下記処方に変更した以外は、実施例15と同様にして光拡散性シートを作成した。下記処方の2種の無機微粒子のうち、二酸化ジルコニウムの含有量Lを7.2部に固定し、二酸化チタンの含有量Nを4.8部、5.4部、6部に異ならせて、3種の光拡散性シートを得た。
・アクリルポリオール樹脂 10部
(アクリディックA-811:DIC社、固形分50%、Tg19℃、屈折率1.49)
・ポリイソシアネート 2部
(タケネートD110N:三井化学社、固形分60%)
・アクリル樹脂粒子(小粒子) 9.6部
(ポリメチルメタクリレート真球状粒子、平均粒子径2~3μm、屈折率1.49)
・アクリル樹脂粒子(大粒子) 4.8部
(ポリメチルメタクリレート真球状粒子、平均粒子径5μm、屈折率1.49)
・二酸化ジルコニウム L部
(酸化ジルコニウムPCS:日本電工社、一次粒子径20nm、屈折率2.40、比重6)
・二酸化チタン(ルチル型TiO2) N部
(トロノックスR-KB-2、バイエル社、一次粒子径20nm、屈折率2.71、比重4.3)
希釈溶剤 94部
実施例16と同様の処方で、2種の無機微粒子(二酸化ジルコニウムと二酸化チタン)の割合を異ならせた複数の光拡散シートを作成した。実施例17では、実施例16の処方における二酸化チタンの含有量Nを2.4部に固定し、二酸化ジルコニウムの含有量Lを9.6部、12部、14.4部、16.8部と異ならせた。また実施例18では、実施例16の処方における二酸化チタンの含有量Nを3.6部に固定し、二酸化ジルコニウムの含有量Lを9.6部、12部、14.4部と異ならせた。実施例19では、実施例16の処方における二酸化チタンの含有量Nを4.8部に固定し、二酸化ジルコニウムの含有量Lを8.4部、9.6部、12部、14.4部、16.8部と異ならせた。
実施例16の光拡散層用塗布液のうち、二酸化ジルコニウムの含有量L及び二酸化チタンの含有量Nをそれぞれ9.6部、4.8部(無機微粒子の含有量として14.4部)に固定し、アクリル樹脂粒子の小粒子と大粒子との割合を異ならせて、複数の光拡散性シートを作成した。実施例20では大粒子の含有量を実施例16と同じ4.8部に固定し、小粒子の含有量を4.8部、7.2部に変えた。実施例21では小粒子の含有量を実施例16と同じ9.6部に固定して、大粒子の含有量を2.4部、3.6部に変えた。
実施例1~21、比較例1~7の光拡散性シートを、4インチのエッジライト型バックライト(光度1300mcdのLED光源8灯、厚さ0.5mmのポリカーボネート製の導光板内蔵)において、当該光拡散性シートのバックコート層が当該導光板と対向するように組み込み、更に、当該光拡散性シートの光拡散層上に、厚み65μmの第一のプリズムシート(TBEF2-GT:住友スリーエム社)と厚み68μmの第二のプリズムシート(TBEF2-GM:住友スリーエム社)を重ねて配置し、実施例1~21、比較例1~7の各々のバックライト装置を作製した。なお、2枚のプリズムシートは、構造列を上側(出射側)にし、構造列それぞれの稜線が直交するように配置した。
CIE-XYZ表色系による、「Y値」で「高光拡散性」を評価した。カラーメーター(日本電色工業社、ZE-2000)により、光拡散性シートの光拡散層を入光面として、JIS Z 8722:2000のD65光源の透過測定方法によるY値を測定した。
上記「バックライト装置の作製」で作製したバックライト装置で、2枚のプリズムシートを取り外して(光拡散性シートのみで)点灯して、実施例1~14、比較例1~7の光拡散性シートの、光源付近の輝度ムラ及び導光板端部の光漏れを目視により評価した。評価は、バックライト装置の光出射面からほぼ垂直に30cmの距離から、LED光源(点光源)のパターンが見えず、且つ、光出射面端部の光漏れが無く、総合して表示面全体が均一に見えるものを「○」、LED光源パターンが見えてしまうか、あるいは、端部の光漏れが見え、総合して表示面全体が均一に見えないものを「×」とした。
上記「バックライト装置の作製」で作製したバックライト装置(2枚のプリズムシート含む)を点灯し、色彩輝度計 CS-200(コニカミノルタ 社製)を用いて、正面方向の輝度を測定し、無機微粒子を含まない光拡散性シートの正面輝度測定値(12,000 cd/m2)で除して、各光拡散性シートの輝度比を算出した。輝度の測定は暗室下で行った。
<測定条件>
・測定距離: 30 cm
・測定角(受光角): 1度
・測定点: 中央1点
JIS K 7105測定方法に従って、ヘーズメーター(スガ試験機社、型式HGM-2K)、カラーコンピューター(スガ試験機社、型式SM-4)により、光拡散性シートの光拡散層を入光面として、全光線透過率(Tt)およびヘーズ(Haze)を測定した。
実施例1~14及び比較例1~7について、測定結果を表1に示す。また実施例15~21について、それぞれ、代表的な一例についての結果を表2に示す。表1及び表2において、量(phr)はバインダー樹脂(固形分)100重量部に対する無機微粒子の重量部である。なお、バインダー樹脂(固形分)100重量部には、硬化剤としてのポリイソシアネートの量を含む。
11 光拡散層
12 支持体
13 バックコート層
30 エッジライト型バックライト装置
31 プリズムシート
32 プリズムシート
33 光拡散性シート
34 光源
35 導光板
36 反射シート
50 直下型バックライト装置
51 プリズムシート
52 光拡散性シート
53 拡散版
54 光源
55 シャーシ
56 反射フィルム
Claims (18)
- 光拡散層を有する光拡散性シートであって、
前記光拡散層は、バインダー樹脂と、光拡散性樹脂粒子と、無機微粒子と、を含み、
前記光拡散性シートは、JIS Z 8722:2000のD65光源の透過測定方法によるY値が、0.3以上2.1以下であることを特徴とする光拡散性シート。 - 請求項1に記載の光拡散性シートであって、
前記無機微粒子が、前記バインダー樹脂より屈折率が高い高屈折率金属酸化物であることを特徴とする光拡散性シート。 - 請求項1に記載の光拡散性シートであって、
前記無機微粒子の屈折率が1.9以上であることを特徴とする光拡散性シート。 - 請求項2に記載の光拡散性シートであって、
前記高屈折率金属酸化物が、酸化ジルコニウム、酸化チタン、および酸化亜鉛から選ばれる一種以上であることを特徴とする光拡散性シート。 - 請求項1に記載の光拡散性シートであって、
前記無機微粒子が、酸化ジルコニウムであり、前記バインダー樹脂(固形分)100重量部に対し、120~320重量部含まれることを特徴とする光拡散性シート。 - 請求項4に記載の光拡散性シートであって、
前記高屈折率金属酸化物として、酸化ジルコニウム及び酸化チタンを用いることを特徴とする光拡散性シート。 - 請求項6に記載の光拡散性シートであって、
酸化ジルコニウムと酸化チタンとの重量比が、50:50~80:20であることを特徴とする光拡散性シート。 - 請求項7に記載の光拡散性シートであって、
前記酸化ジルコニウムと酸化チタンの合計含有量が、前記バインダー樹脂(固形分)100重量部に対し、80~200重量部であることを特徴とする光拡散性シート。 - 請求項1又は6に記載の光拡散性シートであって、
前記光拡散性樹脂粒子は、平均粒子径の異なる2種の樹脂粒子を含むことを特徴とする光拡散性シート。 - 請求項9に記載の光拡散性シートであって、
前記光拡散性樹脂粒子は、平均粒子径の大きい方の樹脂粒子の割合が平均粒子径の小さい方の樹脂粒子の割合と同じかそれ以下であることを特徴とする光拡散性シート。 - 請求項10に記載の光拡散性シートであって、平均粒子径の小さい方の樹脂粒子の平均粒子径が1μm以上4μm以下であることを特徴とする光拡散性シート。
- 請求項1から11のいずれか一項に記載の光拡散性シートであって、
前記バインダー樹脂が、ガラス転移温度が30℃以下のアクリルポリオール樹脂を含むことを特徴とする光拡散性シート。 - 請求項12に記載の光拡散性シートであって、
前記バインダー樹脂が、さらに、ガラス転移温度が40℃以上のアクリルポリオール樹脂を含むことを特徴とする光拡散性シート。 - 請求項13に記載の光拡散性シートであって、
前記ガラス転移温度が30℃以下のアクリルポリオール樹脂(固形分)と前記ガラス転移温度が40℃以上のアクリルポリオール樹脂(固形分)の合計が100重量部の場合に、前記ガラス転移温度が30℃以下のアクリルポリオール樹脂が50重量部以上であることを特徴とする光拡散性シート。 - 請求項1から14のいずれか一項に記載の光拡散性シートであって、
全光線透過率が45%~88%であることを特徴とする光拡散性シート。 - バインダー樹脂と、前記バインダー樹脂(固形分)100重量部に対し60~220重量部の光拡散性樹脂粒子と、前記バインダー樹脂(固形分)100重量部に対し40~480重量部の無機微粒子と、を含み、
前記無機微粒子の屈折率が1.9以上であって、JIS Z 8722:2000のD65光源の透過測定方法によるY値が0.3以上2.1以下、全光線透過率が45%~88%であることを特徴とする光拡散性シート。 - 反射シートと、前記反射シートの上方に設置された導光板と、前記導光板の側面に配置された光源と、前記導光板の光出射面の側に配置された光拡散性シートと、前記光拡散性シートの光出射面の側に配置されたプリズムシートとを備えたバックライト装置であって、前記光拡散性シートとして請求項1から16のいずれか一項に記載の光拡散性シートを用いたことを特徴とするバックライト装置。
- 光源と、前記光源の一方の側に配置された拡散板と、前記光源の他方の側に配置された反射フィルムと、前記拡散板の上方に配置された光拡散性シートと、前記光拡散性シートの光出射面の側に配置されたプリズムシートとを備えたバックライト装置であって、前記光拡散性シートとして請求項1から16のいずれか一項に記載の光拡散性シートを用いたことを特徴とするバックライト装置。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020167034585A KR102393476B1 (ko) | 2014-06-10 | 2015-05-11 | 광확산성 시트 및 그 시트를 포함하는 백라이트 장치 |
JP2016527697A JPWO2015190202A1 (ja) | 2014-06-10 | 2015-05-11 | 光拡散性シート及び該シートを含むバックライト装置 |
CN201580027945.5A CN106461820B (zh) | 2014-06-10 | 2015-05-11 | 光扩散性片及包含该片材的背光装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014119471 | 2014-06-10 | ||
JP2014-119471 | 2014-06-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015190202A1 true WO2015190202A1 (ja) | 2015-12-17 |
Family
ID=54833307
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2015/063486 WO2015190202A1 (ja) | 2014-06-10 | 2015-05-11 | 光拡散性シート及び該シートを含むバックライト装置 |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPWO2015190202A1 (ja) |
KR (1) | KR102393476B1 (ja) |
CN (1) | CN106461820B (ja) |
TW (1) | TWI662300B (ja) |
WO (1) | WO2015190202A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017154397A1 (ja) * | 2016-03-10 | 2017-09-14 | 富士フイルム株式会社 | ガスバリアフィルムおよび波長変換フィルム |
JP2019124786A (ja) * | 2018-01-15 | 2019-07-25 | 恵和株式会社 | 拡散シート、バックライトユニット及び液晶表示装置 |
JP2021518929A (ja) * | 2018-04-17 | 2021-08-05 | エルジー・ケム・リミテッド | 光拡散性バリアフィルム |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109946773A (zh) * | 2017-12-21 | 2019-06-28 | 张家港康得新光电材料有限公司 | 一种薄型光扩散层及光扩散片 |
CN109946772A (zh) * | 2017-12-21 | 2019-06-28 | 张家港康得新光电材料有限公司 | 一种光扩散层及光扩散片 |
CN109946774A (zh) * | 2017-12-21 | 2019-06-28 | 张家港康得新光电材料有限公司 | 一种薄型高透光的光扩散层及光扩散片 |
JP6886992B2 (ja) | 2018-03-30 | 2021-06-16 | 恵和株式会社 | 光拡散板積層体、バックライトユニット、及び液晶表示装置 |
EP3736624A1 (en) | 2019-03-13 | 2020-11-11 | Keiwa Inc. | Multilayer of light diffusers, backlight unit, and liquid crystal display device |
CN110456563A (zh) * | 2019-07-30 | 2019-11-15 | 武汉华星光电技术有限公司 | 背光模组及液晶显示装置 |
CN111276035B (zh) * | 2020-03-20 | 2022-04-12 | 苏州和萃新材料有限公司 | 一种温度指示标签 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005275015A (ja) * | 2004-03-25 | 2005-10-06 | Kimoto & Co Ltd | 光拡散板、導光板、およびこれらを用いたバックライト |
JP2005326774A (ja) * | 2004-05-17 | 2005-11-24 | Soken Chem & Eng Co Ltd | 光拡散シートおよびこれに用いる樹脂組成物 |
JP2006206775A (ja) * | 2005-01-28 | 2006-08-10 | Fuji Photo Film Co Ltd | 光拡散層用塗布組成物、反射防止フィルム及びその製造方法、並びに反射防止フィルムを用いた偏光板及び画像表示装置 |
JP2007272208A (ja) * | 2006-03-06 | 2007-10-18 | Nippon Shokubai Co Ltd | 光拡散シートおよび光拡散板、ならびにそれらを用いたバックライトユニットおよび液晶表示装置 |
JP2008040479A (ja) * | 2006-08-04 | 2008-02-21 | Kofukin Seimitsu Kogyo (Shenzhen) Yugenkoshi | 光拡散板 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2958191B2 (ja) | 1992-08-11 | 1999-10-06 | 株式会社きもと | 光拡散性シート |
JP4271462B2 (ja) * | 2002-03-26 | 2009-06-03 | 恵和株式会社 | 光拡散シート及びこれを用いたバックライトユニット |
JP2006259575A (ja) * | 2005-03-18 | 2006-09-28 | Kimoto & Co Ltd | スクリーン |
CN100356247C (zh) * | 2005-11-29 | 2007-12-19 | 长兴化学工业股份有限公司 | 光学薄片 |
JP5141528B2 (ja) * | 2008-12-15 | 2013-02-13 | 東レ株式会社 | 積層フィルムおよびこれを用いたバックライトユニット |
CN101840103B (zh) * | 2010-04-23 | 2011-07-13 | 上海凯鑫森产业投资控股有限公司 | 一种用于背光模块的扩散片 |
JP6275934B2 (ja) * | 2010-09-17 | 2018-02-07 | 日東電工株式会社 | 光拡散素子、光拡散素子付偏光板、偏光素子、およびこれらを用いた液晶表示装置 |
JP5859224B2 (ja) * | 2011-05-18 | 2016-02-10 | 恵和株式会社 | 光拡散シート、これを用いたバックライトユニット及び光拡散シートの製造方法 |
-
2015
- 2015-05-11 WO PCT/JP2015/063486 patent/WO2015190202A1/ja active Application Filing
- 2015-05-11 KR KR1020167034585A patent/KR102393476B1/ko active IP Right Grant
- 2015-05-11 CN CN201580027945.5A patent/CN106461820B/zh active Active
- 2015-05-11 JP JP2016527697A patent/JPWO2015190202A1/ja active Pending
- 2015-05-26 TW TW104116825A patent/TWI662300B/zh active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005275015A (ja) * | 2004-03-25 | 2005-10-06 | Kimoto & Co Ltd | 光拡散板、導光板、およびこれらを用いたバックライト |
JP2005326774A (ja) * | 2004-05-17 | 2005-11-24 | Soken Chem & Eng Co Ltd | 光拡散シートおよびこれに用いる樹脂組成物 |
JP2006206775A (ja) * | 2005-01-28 | 2006-08-10 | Fuji Photo Film Co Ltd | 光拡散層用塗布組成物、反射防止フィルム及びその製造方法、並びに反射防止フィルムを用いた偏光板及び画像表示装置 |
JP2007272208A (ja) * | 2006-03-06 | 2007-10-18 | Nippon Shokubai Co Ltd | 光拡散シートおよび光拡散板、ならびにそれらを用いたバックライトユニットおよび液晶表示装置 |
JP2008040479A (ja) * | 2006-08-04 | 2008-02-21 | Kofukin Seimitsu Kogyo (Shenzhen) Yugenkoshi | 光拡散板 |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017154397A1 (ja) * | 2016-03-10 | 2017-09-14 | 富士フイルム株式会社 | ガスバリアフィルムおよび波長変換フィルム |
US10712476B2 (en) | 2016-03-10 | 2020-07-14 | Fujifilm Corporation | Gas barrier film and wavelength conversion film |
JP2019124786A (ja) * | 2018-01-15 | 2019-07-25 | 恵和株式会社 | 拡散シート、バックライトユニット及び液晶表示装置 |
JP2021518929A (ja) * | 2018-04-17 | 2021-08-05 | エルジー・ケム・リミテッド | 光拡散性バリアフィルム |
US11508937B2 (en) | 2018-04-17 | 2022-11-22 | Lg Chem, Ltd. | Light-diffusing barrier film |
JP7292651B2 (ja) | 2018-04-17 | 2023-06-19 | エルジー・ケム・リミテッド | 光拡散性バリアフィルム |
Also Published As
Publication number | Publication date |
---|---|
KR20170018327A (ko) | 2017-02-17 |
TWI662300B (zh) | 2019-06-11 |
CN106461820A (zh) | 2017-02-22 |
JPWO2015190202A1 (ja) | 2017-04-20 |
TW201602643A (zh) | 2016-01-16 |
KR102393476B1 (ko) | 2022-05-02 |
CN106461820B (zh) | 2020-01-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2015190202A1 (ja) | 光拡散性シート及び該シートを含むバックライト装置 | |
JP5349041B2 (ja) | レンズシート、面光源装置及び液晶表示装置 | |
KR101918334B1 (ko) | 방현성 필름, 편광판 및 화상 표시 장치 | |
TWI421544B (zh) | An optical film and a backlight device using the same | |
JP2002196117A (ja) | 光拡散層、光拡散性シート及び光学素子 | |
WO2009107536A1 (ja) | 防眩フィルム、防眩性偏光板および画像表示装置 | |
JP6062923B2 (ja) | エッジライト型バックライト装置及び光拡散性部材 | |
KR20100094469A (ko) | 방현 필름, 방현성 편광판 및 화상 표시 장치 | |
JP2009169409A (ja) | 防眩フィルム、防眩性偏光板および画像表示装置 | |
JP6550992B2 (ja) | 量子ドットシート、バックライト及び液晶表示装置 | |
KR101297012B1 (ko) | 광확산성 시트 | |
KR100909427B1 (ko) | 광제어 필름 | |
JP6586805B2 (ja) | エッジライト型バックライト及び液晶表示装置 | |
WO2018225463A1 (ja) | 上用光拡散シートおよびそれを備えたバックライトユニット | |
JP6062922B2 (ja) | エッジライト型バックライト装置及び光拡散性部材 | |
KR20120078508A (ko) | 광학 시트 | |
JP2009122645A (ja) | 防眩フィルム、防眩性偏光板および画像表示装置 | |
JP2008203839A (ja) | 光拡散シート用アクリル樹脂、光拡散シート、レンズシート、面光源装置及び液晶表示装置 | |
EP3715111A1 (en) | Anti-glare film, polarizing plate, and display device | |
KR100804062B1 (ko) | 액정 백라이트 유니트용 광확산필름 | |
TW202411066A (zh) | 顯示器 | |
JP6627297B2 (ja) | 量子ドットシート、バックライト及び液晶表示装置 | |
US20220206188A1 (en) | Anti-glare film, polarizing plate and display apparatus | |
JP2009265613A (ja) | レンズシート、面光源装置および液晶表示装置 | |
JP2017021296A (ja) | 量子ドットシート、バックライト及び液晶表示装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 15806783 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2016527697 Country of ref document: JP Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 20167034585 Country of ref document: KR Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 15806783 Country of ref document: EP Kind code of ref document: A1 |