WO2005083474A1 - 光学部材およびそれを用いたバックライト - Google Patents
光学部材およびそれを用いたバックライト Download PDFInfo
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- WO2005083474A1 WO2005083474A1 PCT/JP2005/003018 JP2005003018W WO2005083474A1 WO 2005083474 A1 WO2005083474 A1 WO 2005083474A1 JP 2005003018 W JP2005003018 W JP 2005003018W WO 2005083474 A1 WO2005083474 A1 WO 2005083474A1
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- WIPO (PCT)
- Prior art keywords
- light
- optical member
- backlight
- guide plate
- light guide
- Prior art date
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/18—Coatings for keeping optical surfaces clean, e.g. hydrophobic or photo-catalytic films
-
- 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
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
-
- 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
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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
Definitions
- the present invention relates to an optical member used for a light diffusing plate, a light guide plate, and other backlights, and more particularly to an optical member that does not change its dimensions over time and does not impair optical characteristics.
- the invention also relates to a backlight using these optical members.
- Edge-light type backlights are used for notebook PCs because the thickness of the knock light itself can be reduced, and direct-type backlights are often used for large LCD televisions.
- These backlights include a light source, a light guide plate, a light diffusion plate, a prism sheet, a light diffusion film, a light reflection film, a polarizing film, a reflection type polarizing film, a retardation film, an electromagnetic wave shielding film, and the like. (See Patent Document 1).
- Patent Document 1 JP-A-9127314 (Claim 1, Paragraph No. 0034)
- the inventors of the present invention have conducted intensive studies to solve the above-mentioned problems.
- the present inventors have found that wrinkles are locally gathered on the material, and that the major cause of bending, waving, wrinkling, and the like of these optical members is due to moisture absorption and desorption of the optical members, and led to the present invention.
- the optical member of the present invention is a planar optical member composed of a single layer or a plurality of layers. It is characterized by being covered with a moisture-proof layer made of a substance having a lower water vapor permeability than the above layer.
- the optical member includes, in addition to the light diffusion plate and the light guide plate, a prism sheet, a light diffusion film, a light reflection film, a polarization film, a reflection type polarization film, and a prism sheet mainly used for a backlight.
- a prism sheet includes optical films or sheets such as phase difference films and electromagnetic wave shielding films.
- the optical member of the present invention is a light diffusion plate made of a synthetic resin, and has a moisture-proof layer made of a substance having a lower water vapor permeability than the light diffusion plate, on both surfaces and Z or end surfaces of the light diffusion plate. It is characterized by having.
- the optical member of the present invention is a light guide plate made of a synthetic resin having at least one end as a light incident surface and a surface substantially orthogonal to the light exit surface, and both surfaces of the light guide plate and Z Alternatively, a moisture-proof layer made of a material having a lower water vapor permeability than the light guide plate is provided on the end face.
- the optical member of the present invention is an optical sheet for a knock light, which has a moisture-proof layer made of a material having a lower water vapor permeability than the member on both surfaces and Z or an end surface of the member. It is characterized by the following.
- the optical member of the present invention is an optical member for a backlight having a functional layer on a synthetic resin base material, and a substance having a lower water vapor permeability than the base material on both surfaces and Z or end surfaces of the base material.
- the present invention is characterized in that a moisture-proof layer which is strong is provided.
- the backlight of the present invention incorporates the optical member of the present invention, and at least one optical member among the light diffusion plate, the light guide plate, and other optical members incorporated in the knock light is the present invention.
- Optical member that is, a backlight according to the present invention is a backlight including a light source and a light diffusion plate disposed on the light source, wherein the light diffusion plate according to the present invention is used as the light diffusion plate. It is a feature.
- a backlight of the present invention is a backlight including a light guide plate and a light source disposed at least at one end of the light guide plate, wherein the light guide plate of the present invention is used as the light guide plate. It is characterized by the following.
- the knock light of the present invention is a backlight or a light guide plate having a light source and a light diffusing plate disposed on the light source, and a light disposed at at least one end of the light guide plate.
- a knock light comprising: a backlight; and one or more optical sheets or optical members for a knock light according to the present invention in a backlight. The invention's effect
- the optical member of the present invention has a moisture-proof layer made of a substance having a low water vapor permeability on both surfaces and on the Z or end surface, so that a plate such as a light diffusion plate or a light guide plate is provided.
- a plate such as a light diffusion plate or a light guide plate
- the occurrence of bending etc. can be prevented, and when this is incorporated in a backlight, local wrinkles are prevented from occurring in the sheet or film-like optical member used in combination
- no image defect occurs on the liquid crystal display.
- the optical member is a sheet or film-like member, it is possible to prevent wrinkles due to moisture absorption and release of the optical member itself, and to prevent local image defects of the liquid crystal display. Can be done.
- Most light diffusion plates and light guide plates are made of synthetic resins from the viewpoints of optical characteristics, weight, and the like, but synthetic resins generally have a high water vapor permeability and tend to absorb moisture easily.
- an optical member that easily absorbs moisture and has a material strength is left in a high-humidity environment for a long time, moisture is sufficiently absorbed by the optical member.
- the backlight is turned on in a state where the optical member has sufficiently absorbed moisture, rapid moisture release starts due to the heat of the light source. This moisture release does not occur uniformly in the optical member, and tends to occur near the light source in the light diffusion plate and the light guide plate. This causes the moisture-depleted part to shrink compared to the part that remains moisture-absorbed. It is in a warped state.
- FIG. 12 shows a state in which the light diffusion plate 1 is bent in the direct backlight.
- Synthetic resins are often used in sheet-like (film-like) optical members such as prism sheets, light diffusion films, light reflection films, polarizing films, reflection type polarizing films, retardation films, and electromagnetic wave shielding films. Therefore, when these optical members are left in a high-humidity environment for a long time, they are easily absorbed by moisture. In the sheet-shaped optical member 1, the absorbed moisture is released from the vicinity of the end face, and immediately causes unevenness in the moisture absorption between the inside and the end, thereby causing, for example, wrinkles as shown in FIG.
- the wrinkles generated in such a sheet-shaped optical member can themselves cause image defects on the display screen of the liquid crystal display, but the light diffusing plate or the light guide plate in the bent state as described above.
- wrinkles are locally generated on the sheet-shaped optical member, and the local image defect becomes extremely remarkable.
- the deflection of the optical member becomes more remarkable as the size of the liquid crystal display increases and the area of the backlight increases, and as a result, the area of the optical member increases.
- the present invention by providing a moisture-proof layer having a material strength with a water vapor transmission rate lower than that of the member on both surfaces and the Z or end surface of the optical member, it is possible to prevent the optical member from absorbing moisture, Even when moisture is absorbed, it can be prevented from being rapidly released. Accordingly, it is possible to prevent the optical member, particularly, the light diffusion plate or the light guide plate from being bent, and to prevent the occurrence of a local image defect of the liquid crystal display.
- a backlight provided with a light diffusion plate may be provided with only a light diffusion plate, or a backlight provided with a light guide plate provided with a moisture-proof layer only on a light guide plate.
- a backlight incorporating a sheet-like optical member even when a moisture-proof layer is provided only on a sheet-like optical member, the effect of the present invention of preventing occurrence of local image defects can be obtained.
- the highest effect can be obtained by providing a moisture-proof layer on both.
- the present invention can prevent the occurrence of deflection. Is extremely useful.
- a synthetic resin constituting the optical member a means for preventing the occurrence of bending by using a synthetic resin having a low water vapor transmission rate can be considered.
- a resin having a low water vapor transmission rate may be used.
- the balance of light transmittance, mechanical strength, heat resistance, solvent resistance, price, etc. is inferior.
- the configuration of the present invention is preferable.
- the light diffusion plate is installed on the light source of the direct-type knock light, has a function of extinguishing the pattern of the light source, and is mainly made of synthetic resin. Since such a light diffusion plate is used to eliminate the pattern of the light source, it needs to be as thick as 110 mm to provide a proper viewing angle while improving the front luminance. It is different from the light diffusion film, which has a thickness of 12-350 m. Further, the area of the light diffusing plate is not particularly limited, but in the present invention, a particularly remarkable effect is exerted on a light diffusing plate having a large area of 900 cm 2 or more in which the problem of deflection is likely to occur.
- Examples of the synthetic resin constituting the light diffusion plate include polyester resin, acrylic resin, acrylic urethane resin, polyester acrylate resin, polyurethane acrylate resin, and epoxy acrylate resin.
- polyester resin acrylic resin, acrylic urethane resin, polyester acrylate resin, polyurethane acrylate resin, and epoxy acrylate resin.
- urethane-based S epoxy-based S, polycarbonate-based resin, cellulose-based resin, acetal-based resin, polyethylene-based resin, polystyrene-based resin, polyamide-based resin, polyimide-based resin
- thermoplastic resins such as melamine-based resins, phenol-based resins, and silicone-based resins, thermosetting resins, and ionizing radiation-curable resins.
- acrylic resins having excellent optical properties are preferably used.
- Fine particles are added to the light diffusion plate in order to impart light diffusion.
- the fine particles include inorganic fine particles such as silica, clay, talc, calcium carbonate, calcium sulfate, barium sulfate, aluminum silicate, titanium oxide, synthetic zeolite, alumina, smectite, styrene resin, urethane resin, benzoguanamine, etc.
- Grease silicone grease, acrylic grease, etc.
- Organic fine particles that are also powerful.
- the light guide plate has a substantially flat plate-like shape formed so that at least one end is a light incident surface and one surface substantially orthogonal to the light incident surface is a light exit surface, and is used for, for example, an edge light type backlight. Is done.
- “on the light exit surface of the light guide plate and on the surface opposite to Z or the light exit surface” may be simply referred to as “on the light guide plate”.
- the light guide plate is mainly made of synthetic resin, and each surface has a complicated surface shape instead of a uniform flat surface, or is provided with diffusion printing such as a dot pattern. There may be.
- the thickness of the light guide plate is about 110 mm.
- the area of the light guide plate is not particularly limited, the present invention has a particularly remarkable effect in a light guide plate having a large area of 900 cm 2 or more, in which the problem of deflection is likely to occur.
- the resin constituting the light guide plate those similar to those exemplified as the resin constituting the light diffusion plate can be used.
- an acrylic resin having excellent optical properties is preferably used.
- organic fine particles may be added to the light guide plate as needed. The same organic fine particles as those added to the light diffusion plate can be used.
- Examples of the optical member or optical sheet for a backlight of the present invention include a prism sheet, a light diffusing film, a light reflecting film, a polarizing film, a reflective polarizing film, a retardation film, and an electromagnetic wave shielding film.
- the light-diffusing film is used to provide appropriate light-diffusing properties while improving the frontal brightness, and has a thin thickness of 12 to 350 m, and is used to erase the light source pattern described above. This is different from the light diffusion plate that is used.
- the knock light optical member 1 has at least one of a synthetic resin base material 11 having a shape such as a film or a plate as shown in FIGS. On the surface, a functional layer 12 having the function may be provided.
- Examples of the synthetic resin base material include a base material having a strong force such as polyethylene terephthalate, polybutylene terephthalate, polycarbonate, and acryl.
- the functional layer is used for backlighting such as light diffusion function, light reflection function, and electromagnetic wave shielding function. It is a layer for imparting a function when used as a scientific member, and also acts as a binder resin, pigment, and other additives. For example, it is possible to form a layer having a light diffusing function with a binder resin and fine particles, and to form a layer having a light reflecting function from a binder resin and a white pigment.
- the moisture-proof layer is a layer or a sealing material (collectively, a moisture-proof layer) on both sides and Z or end face of the light diffusion plate, the light guide plate, the other optical member (optical sheet) or the base material constituting the same.
- Water vapor permeability of the moisture barrier, it 15 is a different force upper limit depending portion Ya member that is provided [g / (m 2 '24h )] or less preferably tool 5 [g / (m 2' 2 4h)] less, more preferably tool l [g / (m 2 ' 2 4h)] or less is more preferable.
- the lower limit of the water vapor permeability is about 0.01 [g / (m 2 '24h)].
- Such substances having a low water vapor transmission rate include inorganic substances and organic substances, and inorganic substances such as silicon, aluminum, titanium, selenium, magnesium, barium, zinc, tin, indium, calcium, and tantalum. And oxides such as zirconium, thorium, and thallium; and inorganic metal compounds such as singly and in mixtures of rosin diapers; and ceramics such as glass.
- Shiridani Viylidene Monoshidani vinyl copolymer bilidene chloride-acrylonitrile copolymer, Shiridani bilidene-acrylic copolymer, biaxially oriented polypropylene (OPP), Unstretched polypropylene (CPP), cyclic polyolefin, polychlorotrifluoroethylene (PCTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene perfluoroalkyl butyl ether
- a synthetic resin such as a polymer (PFA) can be used. Although these are synthetic resins, they have low water vapor permeability.
- the moisture-proof layer from the viewpoint of the moisture-proof property of the obtained moisture-proof layer and from the viewpoint of ⁇ ⁇ , it is preferable to use an inorganic substance. Considering physical properties such as properties, heat resistance, surface hardness, etc., handleability, and price, it is preferable to use silica!
- the water vapor transmission rate of a substance is (thickness)
- a material obtained by evaporating silica to a thickness of 0.04 ⁇ m on polyethylene terephthalate having a thickness of 12 ⁇ m) is about 1 [gZ (m 2 '24h)].
- g / (m 2 '24h)] In the case of an organic substance (synthetic resin), it is about 0.2-1.5 [g / (m 2 '24h)] at a thickness of 100 / zm, and about 6 . 9 [g / (m 2 - 24h)] become a little water vapor transmission rate as compared to, Ru.
- the optical member of the present invention is provided with the above-described moisture-proof layer on both surfaces and Z or end surfaces of the member or the base material constituting the member, and can take various forms.
- each embodiment will be described with reference to the drawings, but the present invention is not limited to these embodiments.
- FIGS. 4A and 4C are cross-sectional views showing an embodiment of the light diffusion plate 3 and the light guide plate 3 of the present invention.
- (A) has a moisture-proof layer 2 on both surfaces of the light diffusion plate 1 or the light guide plate 1
- (b) has a moisture-proof layer 2 on the end face la of the light diffusion plate 1 or the light guide plate 1.
- (C) has a moisture-proof layer 2 on both surfaces and end surfaces of the light diffusion plate 1 or the light guide plate 1.
- FIGS. 5 (a) and 5 (b) are a cross-sectional view and a plan view showing an embodiment of an optical sheet having a single layer according to the present invention.
- the illustrated optical sheet for backlight 3 is obtained by sealing the end face la of the optical sheet 1 with a substance 2 having a lower water vapor permeability than the sheet material.
- FIGS. 6A to 6C show an embodiment in which the present invention is applied to an optical sheet 1 (FIGS. 1 to 3) having a functional layer 12 on one or both sides of a single layer or a base material 11.
- FIG. The illustrated optical sheet for knock light 3 has a moisture-proof layer 2 on both surfaces of the optical sheet 1, which is also a material having lower water vapor permeability than the optical sheet or the base material.
- FIGS. 7A and 7B are cross-sectional views showing an embodiment in which the present invention is applied to an optical sheet 1 (FIGS. 2 and 3) having a functional layer 12 on one or both sides of a base material 11. It is.
- the optical sheet for backlight 3 shown in the figure is provided on both surfaces of the synthetic resin base material 11 with a moisture-proof layer 2 having a material having a lower water vapor permeability than the optical sheet or the base material, and a functional layer 12 provided thereon. Is provided.
- FIG. 8 shows both optical sheets 1 (FIG. 3) having a functional layer 12 on one side of a synthetic resin substrate 11.
- a moisture-proof layer 2 made of a substance having a lower water vapor permeability than the synthetic resin base material is provided, and a functional layer 12 is provided on one of the moisture-proof layers 2.
- the cause of deflection is mainly due to the hygroscopic property of the synthetic resin base material, and therefore, as shown in Figs.
- a moisture-proof layer directly on a synthetic resin substrate, deflection can be effectively prevented.
- the surface of the optical member for backlight can be protected.
- it is provided on the outermost surface of the member.
- the refractive index of the inorganic substance used as the moisture-proof layer is set lower than that of the base material / functional layer, and is adjusted to a specific thickness.
- the moisture-proof layer is the outermost surface, the light reflectivity can be controlled to improve the light transmittance.
- FIG. 9 is a cross-sectional view showing an embodiment of the optical member in which the moisture-proof layer 21 is provided not only on both sides of the optical sheet or the synthetic resin base but also on the end face la.
- FIG. 6 (a) shows a case where a moisture-proof layer is provided on the end face of the optical sheet 3 in FIG. 6 (a), the optical sheet shown in FIGS. 6 (b), (c), FIG. 7, and FIG. .
- the end surface of the synthetic resin base material that is connected to the end surface of the entire optical member may be sealed with a moisture-proof layer.
- the moisture-proof layer is formed on both surfaces or end faces of the optical member or the base material by the above-described substance having a low water vapor permeability by a vacuum deposition method, a sputtering method, an ion plating method, or the like. Can be formed by dissolving or dispersing the compound in a solvent, coating and drying by a known coating method.
- a material obtained by forming a moisture-proof layer on a synthetic resin film by the above-described method may be laminated on both surfaces and end surfaces of the optical member and the substrate.
- a synthetic resin film is formed from a synthetic resin having a low water vapor transmission rate, and the film is bonded to both surfaces or end surfaces of the optical member and the substrate by using an adhesive or by heat melting.
- the thickness of the moisture-proof layer is not particularly limited, but in the case of an inorganic substance, the lower limit is preferably 0.01 m or more, more preferably 0.02 m or more. Make the thickness 0.01 m or more Thereby, the water vapor permeability can be sufficiently suppressed.
- the upper limit of the thickness is preferably 0.5 m or less, and more preferably 0.3 m or less, from the viewpoint of cost effectiveness.
- the lower limit is preferably L m or more, more preferably 10 m or more. By setting the thickness to 1 m or more, the water vapor permeability can be sufficiently suppressed.
- the upper limit of the thickness is more preferably 50 m or less, preferably 100 m or less, from the viewpoint of not making the overall thickness too large.
- the width of the outer peripheral portion sealed by the moisture-proof layer is preferably 3 mm or more, more preferably 1 mm or less at the lower limit.
- the width of the sealing portion is preferably 3 mm or more, more preferably 1 mm or less at the lower limit.
- the width of the sealing portion is preferably 3 mm or more, more preferably 1 mm or less at the lower limit.
- the width of the sealing portion is preferably 20 mm or less, more preferably 10 mm or less, from the viewpoint of cost effectiveness and optical characteristics.
- the light diffusion plate, light guide plate, and optical sheet of the present invention described above are mainly used as one component of a knock light constituting a liquid crystal display, an illuminated signboard, and the like.
- the light diffusing plate is used as a component of a so-called direct type knock light
- the light guide plate is used as a component of a so-called edge light type backlight.
- the backlight of the present invention has at least a light diffusion plate or a light guide plate and a light source, and further has one or two or more types of optical sheets according to the purpose. And at least one of the optical sheets comprises the light diffusion plate, light guide plate or optical sheet of the present invention described above.
- a backlight having the light diffusion plate of the present invention will be described.
- a backlight having a light diffusion plate is called a direct-type backlight, and includes a light source and a light diffusion plate arranged on the light source as basic components.
- a cold cathode tube is mainly used.
- Examples of the shape of the light source include a linear light source and a U-shaped light source.
- the above-described light diffusing plate of the present invention is used. That is, a moisture-proof layer made of a substance having a lower water vapor permeability than the synthetic resin constituting the light diffusion plate is provided on both sides and Z or the end face. Use the formed one.
- One or two or more optical members may be provided on the surface of the light diffusion plate opposite to the light source, depending on the purpose. Further, these optical members may be provided in other portions of the direct-type backlight, such as the side opposite to the light diffusion plate of the light source.
- Examples of such an optical member include a prism sheet, a light diffusion film, a light reflection film, a polarizing film, a reflective polarizing film, a retardation film, and an electromagnetic wave shielding film.
- the optical members of the present invention that is, those having a moisture-proof layer formed on both surfaces and Z or end surfaces thereof, which also has a material having lower water vapor permeability than the members, are generally used. It may be an optical member.
- an optical member for example, as a prism sheet, there are BEF, trade name RBEF, trade name wave film of Sumitomo 3LEM, and diamond art trade name of Mitsubishi Rayon Co., Ltd.
- the light diffusion film include Opulse (trade name of Keiwasha) and D114 (trade name of Jidden).
- Examples of the light reflection film include Leila, a trade name of Eiwa, and ESR, a trade name of Sumitomo 3LEM.
- the polarizing film include NPF (trade name of Nitto Denko Corporation) and Sumikaran (trade name of Sumitomo Iridakusha).
- DBEF sumitomo 3LEM.
- Electromagnetic shield films include Electrista, a brand name of Nitto Denko Corporation, and Leftel, a brand name of Teijin Limited.
- FIG. 10 shows an example of a typical direct-type backlight to which the present invention is applied.
- the backlight 9 has a plurality of light sources 7 arranged on a reflection film 6 housed in a chassis 8 and a light diffusion film 4 and a prism on the light diffusion plate 31 of the present invention.
- Sheet 5 is located.
- the backlight of the present embodiment uses a light diffusion plate having a moisture-proof layer made of a material having low water vapor permeability on both surfaces and Z or an end surface.
- a light diffusion plate having a moisture-proof layer made of a material having low water vapor permeability on both surfaces and Z or an end surface.
- the optical member provided on the light diffusion plate is bent, as well as to prevent the light diffusion plate from being bent, thereby preventing a local image defect of the display.
- the area of the light exit surface where the problem of deflection is likely to occur is 900 cm 2 or more. It has a remarkable effect on backlight.
- the present invention is particularly suitable for a direct backlight because such a wide area knock light is widely used in a direct backlight.
- a backlight having the light guide plate of the present invention will be described.
- a backlight having a light guide plate is called an edge light type backlight, and includes a light guide plate and a light source arranged at least at one end of the light guide plate as basic components.
- a cold cathode tube is mainly used.
- Examples of the shape of the light source include a linear light source and an L-shaped light source.
- optical members are provided on the light exit surface of the light guide plate of the edge light type backlight and on the surface opposite to the Z or the light exit surface depending on the purpose.
- Examples of such an optical member include a prism sheet, a light diffusion film, a light reflection film, a polarizing film, a reflection type polarizing film, a retardation film, and an electromagnetic wave shielding film similar to those exemplified in the direct type backlight.
- these optical members may be provided in other parts in the edge light type backlight, such as around the light source of the edge light type backlight.
- the optical member of the present invention in which a moisture-proof layer is provided on both surfaces or end surfaces of the member or the substrate, may be used in combination with part or all of these optical members.
- FIG. 11 shows an example of a typical edge-light type backlight to which the present invention is applied.
- the knock light 9 has a configuration in which the light sources 7 are provided at both ends of the above-described light guide plate 32 of the present invention, and the light diffusion film 4 and the prism sheet 5 are arranged above the light guide plate 32.
- the light source 7 is covered with the reflection film 6 except for the portion facing the light guide plate 32 so that the light from the light source 7 is efficiently incident on the light guide plate 32.
- the reflection film 6 housed in the chassis 8 is provided below the light guide plate 32.
- a light guide plate having a moisture-proof layer having a low water vapor permeability and also having a material strength is used as a light guide plate.
- the same effects as those of the backlight according to the first embodiment can be obtained.
- the embodiment of the backlight of the present invention has been described. It is sufficient if it has the characteristics of the component.
- a light diffusing plate an inorganic material or a material for imparting light diffusing property to synthetic resin can be used.
- a conventional light diffusion plate formed by adding organic fine particles, and combining it with a prism sheet a light diffusion film, a light reflection film, a polarizing film, a reflection type polarizing film, a retardation film, and an electromagnetic wave shielding film.
- a member having a moisture-proof layer on both sides and end surfaces of the member or the substrate is used as a direct-type backlight, or a conventional light guide plate made of a synthetic resin is used as the light guide plate.
- an optical member having a moisture-proof layer on both surfaces or end surfaces of the member or the base material to form an edge light type backlight is also included in the present invention.
- a direct-type knock light (light-emitting surface area: 2090 cm 2 ) was taken out from a commercially available 26-inch LCD TV using a direct-type backlight as the knock light.
- the direct backlight has a light diffusion plate, a light diffusion film, a prism sheet, and a polarizing film on a light source.
- an acrylic resin light diffusion plate (area 2090 cm 2 ) was taken out of the direct type backlight, and both surfaces of the light diffusion plate were treated as a substance having a lower water vapor permeability than the light diffusion plate.
- the following moisture-proof layer coating solution using bilyden resin is applied and dried to form a moisture-proof layer having a water vapor permeability of about 7 [gZ (m 2 '24h)]. Obtained.
- the light diffusing plate was returned to the backlight to obtain the backlight of the present invention.
- edge-light type backlight (light exit surface area: 993 cm 2 ) was also extracted for the 18-inch desktop PC LCD display that uses an edge-light type backlight as a knock light.
- the edge light type backlight has light sources at both ends of the light guide plate, has a light diffusion film, a prism sheet, and a polarizing film on the light emission surface of the light guide plate, and has a surface opposite to the light emission surface of the light guide plate. It had a reflective film on top.
- an acrylic resin light guide plate (993 cm 2 ) was taken out from the edge light type backlight, and both surfaces of the light guide plate were treated with vinyl chloride as a substance having a lower water vapor permeability than the light guide plate.
- the same moisture-proof layer coating solution as in Example 1 using a resin was applied and dried to form a moisture-proof layer having a water vapor permeability of about 7 [gZ (m 2 '24h)].
- a light plate was obtained.
- the light guide plate was returned to the backlight to obtain the backlight of the present invention.
- a knock light of Comparative Example 1 was obtained in the same manner as in Example 1, except that the light diffusion plate was not provided with a moisture-proof layer.
- a backlight of Comparative Example 2 was obtained in the same manner as in Example 2, except that a moisture-proof layer was not provided on the light guide plate.
- the deflections of the obtained backlights of Comparative Examples 1 and 2 were evaluated in the same manner as in Examples 1 and 2, and after three hours had elapsed since the liquid crystal TV or the liquid crystal display was turned on, the surrounding area was displayed on the liquid crystal display. A phenomenon was observed in which a portion where the image state was different from that of the image occurred locally. This localized image defect was gradually reduced in size over time, but could not disappear completely even after several days.
- a light diffusion layer coating solution of the following formulation on one side of a synthetic resin base material (polyethylene terephthalate, thickness 100 / zm) with a water vapor permeability of about 6.9 [g / (m 2 ⁇ 24h)] Coating and drying were performed to a thickness of 12 m to form a light diffusion layer, and a light diffusion film was obtained.
- a synthetic resin base material polyethylene terephthalate, thickness 100 / zm
- a water vapor permeability about 6.9 [g / (m 2 ⁇ 24h)]
- the end face and the outer peripheral portion of the light diffusion film were made to have a sufficiently low water vapor transmission rate than the light diffusion film, and a silica vapor deposition film (Tech Barrier V: Mitsubishi Plastics, water vapor transmission rate of about 0).
- a light diffusing plate is disposed on the light source, and the backlight optical member (light diffusing film) of the present invention obtained in Example 3 is disposed on the light diffusing plate. I got a backlight (size 26).
- a synthetic resin base material (polyethylene terephthalate) with a water vapor permeability of about 6.9 [g / (m 2 ⁇ 24h)] DOO, the end face and the outer peripheral portion of the thickness 100 / zm), low water vapor transmission rate silica-deposited fill beam (Tech Barrier V: Mitsubishi ⁇ Co., vapor permeability of about 0. 7 [g / (m 2 - 24h)] ) was sealed via an adhesive. The width of the sealed outer peripheral portion was 10 mm.
- a light diffusion layer was formed on one surface of the synthetic resin base material subjected to the sealing treatment in the same manner as in Example 3, to obtain an optical member for a backlight (light diffusion film) of the present invention.
- Example 4 light sources were arranged at both ends of the light guide plate, and further, the backlight optical member (light diffusion film) of the present invention obtained in Example 4 was arranged on the light emission surface of the light guide plate, and the edge light of the present invention was arranged. A type backlight was obtained (size is 18 type).
- Example 5 a light diffusing plate was disposed on the light source, and the backlight optical member (light diffusing film) of the present invention obtained in Example 5 was disposed on the light diffusing plate. I got a backlight (size 26).
- Both surfaces of a synthetic resin substrate (polyethylene terephthalate, 100 m thick) with a water vapor permeability of about 6.9 [g / (m 2 ⁇ 24h)] are coated with silica as a substance with low water vapor permeability.
- a light diffusion layer was formed on one of the moisture-proof layers in the same manner as in Example 5.
- An optical member (light diffusion film) for a knock light of Example 6 was obtained.
- Example 6 Light sources were arranged at both ends of the light guide plate, and further, the optical member for a backlight (light diffusion film) of the present invention obtained in Example 6 was arranged on the light emitting surface of the light guide plate. An edge-light type backlight (size 18 type) was obtained.
- Comparative Examples 3 and 4 the light-diffusing films of Comparative Examples 3 and 4 were produced in the same manner as in Examples 3 and 4, except that the moisture-proof layer was not formed on the backlight optical member of Examples 3 and 4. And got the backlight.
- the deflections of the obtained backlights of Comparative Examples 3 and 4 were evaluated in the same manner as in Examples 1 and 2, and after three hours had elapsed since the liquid crystal TV and the liquid crystal display were turned on, they were displayed on the liquid crystal display. However, a phenomenon was observed in which a portion where the image state was different from that of the surroundings occurred locally. These localized image defects were gradually reduced over time, and did not disappear completely after several days.
- the backlight optical member (light diffusion film) incorporated in the liquid crystal TV and the liquid crystal display was taken out, local wrinkles were observed.
- FIG. 1 is a cross-sectional view illustrating an example of a conventional optical member for a backlight.
- FIG. 2 is a cross-sectional view showing another embodiment of a conventional optical member for a backlight.
- FIG. 3 is a cross-sectional view showing another example of a conventional optical member for a backlight.
- FIG. 4 is a cross-sectional view showing one embodiment of the light diffusion plate of the present invention or the light guide plate of the present invention.
- FIG. 5 shows an embodiment of an optical member for a backlight according to the present invention, in which (a) is a cross-sectional view and (b) is a plan view.
- FIG. 6 is a cross-sectional view showing a plurality of embodiments of the optical member for a backlight according to the present invention.
- FIG. 7 is a cross-sectional view showing a plurality of embodiments of the optical member for a backlight according to the present invention.
- FIG. 8 is a cross-sectional view showing another embodiment of the backlight optical member of the present invention.
- FIG. 9 is a sectional view showing another embodiment of the backlight optical member of the present invention.
- FIG. 10 is a cross-sectional view showing one embodiment of the backlight of the present invention.
- FIG. 11 is a sectional view showing another embodiment of the backlight of the present invention.
- FIG. 12 is a view for explaining a state of deflection in a light diffusion plate or a light guide plate.
- FIG. 13 is a view for explaining a state of deflection in an optical sheet.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Liquid Crystal (AREA)
- Optical Elements Other Than Lenses (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/590,872 US20110110117A1 (en) | 2004-02-27 | 2005-02-24 | Optical member and backlight using the same |
JP2006510445A JPWO2005083474A1 (ja) | 2004-02-27 | 2005-02-24 | 光学部材およびそれを用いたバックライト |
Applications Claiming Priority (10)
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JP2004052781 | 2004-02-27 | ||
JP2004-052781 | 2004-02-27 | ||
JP2004-052780 | 2004-02-27 | ||
JP2004052780 | 2004-02-27 | ||
JP2004088625 | 2004-03-25 | ||
JP2004-088625 | 2004-03-25 | ||
JP2004094652 | 2004-03-29 | ||
JP2004-094652 | 2004-03-29 | ||
JP2004094651 | 2004-03-29 | ||
JP2004-094651 | 2004-03-29 |
Publications (1)
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WO2005083474A1 true WO2005083474A1 (ja) | 2005-09-09 |
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PCT/JP2005/003018 WO2005083474A1 (ja) | 2004-02-27 | 2005-02-24 | 光学部材およびそれを用いたバックライト |
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US (1) | US20110110117A1 (ja) |
JP (1) | JPWO2005083474A1 (ja) |
WO (1) | WO2005083474A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7572507B2 (en) * | 2006-01-31 | 2009-08-11 | Kabushiki Kaisha Topcon | Optical element and moisture-proof coating method thereof |
WO2013011774A1 (ja) * | 2011-07-15 | 2013-01-24 | 富士フイルム株式会社 | 面状照明装置 |
WO2018105365A1 (ja) * | 2016-12-07 | 2018-06-14 | セントラル硝子株式会社 | 導光板、面発光装置及び導光板の製造方法 |
JP2018133322A (ja) * | 2017-02-17 | 2018-08-23 | 采資新技股▲ふん▼有限公司Tsaize Technology Co., Ltd. | ランプカバーのオプティカルディバイス |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US20120120682A1 (en) * | 2010-11-16 | 2012-05-17 | Qualcomm Mems Technologies, Inc. | Illumination device with light guide coating |
CN105652520B (zh) * | 2016-04-08 | 2019-03-08 | 深圳市华星光电技术有限公司 | 一种超薄lcd模组及液晶显示器 |
US10356963B2 (en) * | 2016-04-08 | 2019-07-16 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Ultrathin LCD module and liquid crystal display |
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Also Published As
Publication number | Publication date |
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JPWO2005083474A1 (ja) | 2007-11-22 |
US20110110117A1 (en) | 2011-05-12 |
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