WO2011025017A1 - Dispositif d'éclairage plan - Google Patents

Dispositif d'éclairage plan Download PDF

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Publication number
WO2011025017A1
WO2011025017A1 PCT/JP2010/064754 JP2010064754W WO2011025017A1 WO 2011025017 A1 WO2011025017 A1 WO 2011025017A1 JP 2010064754 W JP2010064754 W JP 2010064754W WO 2011025017 A1 WO2011025017 A1 WO 2011025017A1
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WO
WIPO (PCT)
Prior art keywords
light
light guide
guide sheet
incident surface
light incident
Prior art date
Application number
PCT/JP2010/064754
Other languages
English (en)
Japanese (ja)
Inventor
修 岩崎
Original Assignee
富士フイルム株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 富士フイルム株式会社 filed Critical 富士フイルム株式会社
Priority to CN2010800383992A priority Critical patent/CN102483197A/zh
Publication of WO2011025017A1 publication Critical patent/WO2011025017A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/61—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using light guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/68—Details of reflectors forming part of the light source
    • 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
    • G02B6/0045—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 by shaping at least a portion of the light guide
    • G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
    • 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
    • G02B6/0055—Reflecting element, sheet or layer
    • 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
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0091—Positioning aspects of the light source relative to the light guide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V2200/00—Use of light guides, e.g. fibre optic devices, in lighting devices or systems
    • F21V2200/20—Use of light guides, e.g. fibre optic devices, in lighting devices or systems of light guides of a generally planar shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to a light guide plate in which light emitted from a light source is incident and propagates, scatters and exits from a light exit surface, and a planar illumination device that illuminates the interior and the exterior having the light guide plate and the light source, Alternatively, the present invention relates to a planar illumination device used as a backlight for illuminating a liquid crystal panel of a liquid crystal display device or a backlight for an advertisement panel, an advertising tower, a signboard, or the like.
  • a backlight unit that irradiates light from the back side of the liquid crystal display panel and illuminates the liquid crystal display panel.
  • the backlight unit is configured by using components such as a light guide plate that diffuses light emitted from a light source for illumination and irradiates the liquid crystal display panel, a prism sheet that diffuses light emitted from the light guide plate, and a diffusion sheet. .
  • a backlight unit of a large-sized liquid crystal television is mainly used in a so-called direct type in which a light guide plate is disposed directly above a light source for illumination.
  • a plurality of cold-cathode tubes, which are light sources are arranged on the back surface of the liquid crystal display panel, and a uniform light quantity distribution and necessary luminance are ensured with the inside as a white reflecting surface.
  • the direct type backlight unit needs a thickness of about 30 mm in the vertical direction with respect to the liquid crystal display panel, and it is difficult to make it thinner.
  • the light emitted from the light source for illumination is guided in a predetermined direction, and is emitted from the light emitting surface that is different from the surface on which the light is incident.
  • a backlight unit using a light guide plate As such a backlight unit using a light guide plate, a plate-shaped light guide plate in which light is incident from a side surface and light is emitted from the surface, in which scattering particles for scattering light are mixed into a transparent resin, is used.
  • a backlight unit of a method to be used has been proposed.
  • Patent Document 1 includes a light scattering light guide having at least one light incident surface region and at least one light extraction surface region, and light source means for performing light incidence from the light incident surface region
  • the light-scattering light-guiding light source device is characterized in that the light-scattering light-guiding body has a region having a tendency to decrease in thickness as the distance from the light incident surface increases.
  • Patent Document 2 includes a light scattering light guide, a prism sheet disposed on the light extraction surface side of the light scattering light guide, and a reflector disposed on the back side of the light scattering light guide. A surface light source device is described.
  • Patent Document 3 includes a light emission direction correcting element made of a plate-like optical material including a light incident surface having repetitive undulations in a prism array and a light emission surface provided with light diffusibility.
  • a liquid crystal display is described
  • Patent Document 4 discloses a light source device that includes a light scattering light guide provided with scattering ability therein, and a light supply unit that supplies light from an end surface of the light scattering light guide. Is described.
  • the thickness of the intermediate portion is formed larger than the thickness of the end portion on the incident side and the end portion on the opposite side, and the thickness increases as the distance from the light incident portion increases.
  • An optical plate has also been proposed (see, for example, Patent Documents 5 to 8).
  • Patent Document 9 discloses a long light source containing a light source.
  • a light guide plate unit is described in which a light guide plate holding member holds an end portion of a light guide plate containing a light scatterer.
  • the backlight unit is required to be larger and thinner and lighter. Therefore, a backlight unit using a light guide plate that mixes scattering particles that scatter light as described above, guides light incident on the light incident surface in a direction different from the direction in which the light is incident, and emits the light from the light exit surface.
  • a backlight unit using a light guide plate that mixes scattering particles that scatter light as described above guides light incident on the light incident surface in a direction different from the direction in which the light is incident, and emits the light from the light exit surface.
  • Various proposals have been made. By arranging the light source on the side surface of the light guide plate in this way, it is possible to realize a thin and light weight compared to the backlight unit in which the light source is arranged on the back surface of the light guide plate.
  • further thinning has been demanded for large displays such as large liquid crystal televisions.
  • the light guide plate is flexible, that is, with flexibility, and the surface of the light guide plate is formed into various curved surfaces, so that it can be used not only as a liquid crystal display but also as electric decoration and general lighting.
  • a planar lighting device that can be used.
  • various types of lighting devices that use organic EL or inorganic EL have been proposed as thin and flexible lighting devices, but it is difficult to increase the size of devices using organic EL or inorganic EL.
  • the object of the present invention is to solve the above-mentioned problems of the prior art and cause the light guide plate to expand or contract due to heat or moisture absorption even in a planar lighting device that uses a large, thin, and flexible light guide plate. Even if the light guide plate is deformed due to vibration or the like, the distance and the positional relationship between the light incident portion of the light guide plate and the LED or the like serving as the light source can be properly maintained. Plane shape that prevents the light usage efficiency from being reduced due to the expansion and contraction, warping, and vibration of the light guide plate, and that guides the incident light to the back of the light guide plate to achieve uniform illumination The object is to provide a lighting device.
  • the present invention provides a rectangular light emitting surface, at least one light incident on which light traveling in a direction parallel to the light emitting surface is provided.
  • a plurality of light sources having a surface and a light guide sheet having a back surface opposite to the light emitting surface, a light source disposed to face the light incident surface, and a support member that supports the light source
  • the light source unit is arranged in the extending direction of the light incident surface, and at least the surface of the support member of the light source unit, the light emitting surface and the back surface of the light guide sheet
  • the planar illumination device is characterized in that one end on the light incident surface side is fixed in close contact.
  • the surface of the support member of the light source unit and the end portion on the light incident surface side of at least one of the light emitting surface and the back surface of the light guide sheet are bonded and fixed.
  • the said support member of the said light source unit clamps and fixes the said light guide sheet from the said light-projection surface side and the said back side of the said light guide sheet.
  • the reflective material is a plurality of reflective films arranged in the extending direction of the light incident surface, and the light incident surface side end of at least one of the light emitting surface and the back surface of the light guide sheet It is preferable to arrange it by adhering to. Moreover, it is preferable that the said reflective film is adhere
  • the said light source consists of a some point light source arranged in the extension direction of the said light-incidence surface facing the said light-incidence surface.
  • the said light guide sheet is a film-like thing whose thickness of the direction perpendicular
  • the connection member which has the elasticity which connects the said light source unit and the adjacent light source unit.
  • the surface of the light guide sheet is covered with an optically transparent hard coat material. Further, the hard coat material preferably has a refractive index of 1.43 to 1.65.
  • the light source unit has a width in the extending direction of the light incident surface of the light guide sheet of 10 to 200 mm.
  • the width of the light source unit in the direction perpendicular to the light incident surface of the light guide sheet is preferably 10 to 20 mm.
  • the said light guide sheet is suspended and hold
  • the light incident surface is provided on two opposite sides of the light emitting surface, and a plurality of the light source units are arranged so that the light sources face the two light incident surfaces, respectively. It is preferable. Alternatively, it is preferable that the light incident surface is provided on one end side of the light emitting surface, and the light source unit is arranged so as to face the light source with respect to one light incident surface. . Whether the light source unit is arranged on two light incident surfaces or one light incident surface may be selected according to the performance and cost required for the apparatus.
  • the light source unit By arranging the light source unit on the two light incident surfaces, the light amount and the illuminance distribution can be made more suitable. On the other hand, by adopting a configuration in which the light source unit is arranged on one light incident surface, the number of light sources can be reduced and the cost can be reduced.
  • the thickness of the light guide sheet gradually increases as the thickness of the light guide sheet increases from the light incident surface.
  • the thickness of the light guide sheet gradually decreases as the light guide sheet is separated from the light incident surface. What is necessary is just to select the shape of a light guide sheet according to the performance etc. which are calculated
  • a light scatterer is kneaded and dispersed in the light guide sheet. Furthermore, it is preferable that the light guide sheet is composed of a plurality of layers having different particle concentrations of the light scatterer.
  • the distance and the positional relationship between the light incident surface of the light guide plate and the light source can be appropriately maintained, and the light guide plate can be formed by heat or moisture absorption. It is possible to prevent the light use efficiency from being lowered due to expansion and contraction, warpage, and deformation of the light guide plate due to vibrations, and to realize uniform illumination.
  • FIG. 2 is a sectional view taken along line II-II of the liquid crystal display device shown in FIG. (A) is a partially omitted plan view showing a light source and a light guide plate of the planar illumination device shown in FIG. 2, and (B) is a sectional view taken along line BB of (A).
  • FIG. (A) to (C) are cross-sectional views schematically showing another example of the light guide sheet.
  • FIG. 1 shows schematic structure of the light source of the planar illuminating device shown in FIG. FIG.
  • FIG. 4 is a schematic perspective view showing a part of the backlight unit shown in FIG. It is sectional drawing which shows a part of other example of a backlight unit typically. It is sectional drawing which shows a part of other example of a backlight unit typically.
  • (A) is a plan view schematically showing a part of another example of a backlight unit, and (B) is a sectional view taken along the line CC of (A).
  • FIG. 1 is a perspective view schematically showing a liquid crystal display device provided with a planar illumination device according to the present invention
  • FIG. 2 is a cross-sectional view taken along the line II-II of the liquid crystal display device shown in FIG. 3A is a view taken along the line III-III of the planar illumination device (hereinafter also referred to as “backlight unit”) shown in FIG. 2, and FIG.
  • FIG. 1 is a perspective view schematically showing a liquid crystal display device provided with a planar illumination device according to the present invention
  • FIG. 2 is a cross-sectional view taken along the line II-II of the liquid crystal display device shown in FIG. 3A is a view taken along the line III-III of the planar illumination device (hereinafter also referred to as “backlight unit”) shown in FIG. 2, and FIG.
  • backlight unit planar illumination device
  • the liquid crystal display device 10 includes a backlight unit 20, a liquid crystal display panel 12 disposed on the light emission surface side of the backlight unit 20, and a drive unit 14 that drives the liquid crystal display panel 12.
  • a part of the liquid crystal display panel 12 is not shown in order to show the configuration of the backlight unit.
  • the liquid crystal display panel 12 applies a partial electric field to liquid crystal molecules arranged in a specific direction in advance to change the arrangement of the molecules, and uses the change in the refractive index generated in the liquid crystal cell to make a liquid crystal display. Characters, figures, images, etc. are displayed on the surface of the display panel 12.
  • the drive unit 14 applies a voltage to the transparent electrode in the liquid crystal display panel 12, changes the direction of the liquid crystal molecules, and controls the transmittance of light transmitted through the liquid crystal display panel 12.
  • the backlight unit 20 is an illuminating device that irradiates light from the back surface of the liquid crystal display panel 12 to the entire surface of the liquid crystal display panel 12, and has a light emission surface 24a having substantially the same shape as the image display surface of the liquid crystal display panel 12.
  • the backlight unit 20 in this embodiment includes a plurality of LED arrays 28, a light guide sheet 30, an optical member unit 32, and a reflective film. 34, a lighting device body 24 having a plurality of upper guide reflection films 36 and a plurality of lower guide reflection films 38, a lower housing 42, an upper housing 44, an upper spacer 72, and a housing 26 having a lower spacer 74, and a slide.
  • a power storage unit 49 that stores a plurality of power supplies for supplying power to the LED array 28 is attached to the back side of the lower housing 42 of the housing 26.
  • each component which comprises the backlight unit 20 is demonstrated.
  • the illuminating device main body 24 scatters the light emitted from the LED array 28 that emits light, the light guide sheet 30 that emits light emitted from the LED array 28 as planar light, and the light emitted from the light guide sheet 30.
  • An optical member unit 32 that diffuses light to make it more uniform, and an upper guide reflection film 36 and a lower guide reflection film 38 for allowing light emitted from the LED array 28 to enter the light guide sheet 30 efficiently.
  • FIG. 4 is a schematic perspective view showing the shape of the light guide sheet.
  • the light guide sheet 30 is a film-like member having a thickness of 1 mm or less.
  • the light emitting surface 30 a having a rectangular shape and a long side of the light emitting surface 30 a are provided.
  • Two light incident surfaces (a first light incident surface 30d and a second light incident surface 30e) formed on both end surfaces substantially perpendicular to the light emitting surface 30a, and opposite to the light emitting surface 30a, that is, a light guiding surface.
  • a first light incident surface 30d and a second light incident surface 30e formed on both end surfaces substantially perpendicular to the light emitting surface 30a, and opposite to the light emitting surface 30a, that is, a light guiding surface.
  • the light guide sheet 30 has a thickness that increases from the first light incident surface 30d and the second light incident surface 30e toward the center, and is thickest at a portion corresponding to the bisector ⁇ in the center.
  • the two light incident surfaces (first light incident surface 30d and second light incident surface 30e) at both ends are the thinnest.
  • the light guide sheet 30 is formed by kneading and dispersing scattering particles for scattering light in a transparent resin.
  • the transparent resin material used for the light guide sheet 30 include PET (polyethylene terephthalate), PP (polypropylene), PC (polycarbonate), PMMA (polymethyl methacrylate), benzyl methacrylate, MS resin, or COP (cycloolefin).
  • an optically transparent resin such as a polymer.
  • fine particles such as silicone particles such as Tospearl (trademark), silica particles, zirconia particles, dielectric polymer particles, and the like can be used.
  • the light guide sheet 30 includes a first layer 60 on the light emitting surface 30a side, a third layer 64 on the curved portion 30h side, and a second layer 62 between the first layer 60 and the third layer 64. It is formed in a three-layer structure divided into two. Specifically, the light emitting surface 30a, a part of the first light incident surface 30d and the second light incident surface 30e on the light emitting surface 30a side, and the end portions are the first light incident surface 30d and the second light incident surface. A region in which the cross section surrounded by the surface included in 30 e is a rectangle is the first layer 60.
  • the layer is adjacent to the first layer, the end portion of which is included in the first light incident surface 30d and the second light incident surface 30e, and the back surface of the first light incident surface 30d and the second light incident surface 30e.
  • the section surrounded by a part of the side, the first inclined surface 30b and the second inclined surface 30c, and the surface connecting the ends of the first inclined surface 30b and the second inclined surface 30c on the curved portion 30h side is rectangular.
  • the trapezoidal shape becomes the second layer 62.
  • the cross section surrounded by the curved portion 30h which is a layer adjacent to the second layer and connects the ends of the first inclined surface 30b and the second inclined surface 30c on the curved portion 30h side, has an arcuate shape.
  • the region becomes the third layer 64.
  • the end surface of which is included in the first light incident surface 30d and the second light incident surface 30e is the boundary surface Z between the first layer 60 and the second layer 62, and the first inclined surface 30b and the second inclined surface.
  • a surface connecting the ends of the curved portion 30h side of 30c is defined as a boundary surface Y between the second layer 62 and the third layer 64, in order from the light emitting surface 30a side, the first layer 60, the second layer 62, and the second layer Three layers 64 are formed.
  • the light guide sheet 30 is divided into the first layer 60, the second layer 62, and the third layer 64 at the boundary surface Z and the boundary surface Y, but the first layer 60, the second layer 62, and the third layer 64 are separated.
  • the layer 64 has a structure in which the same scattering particles are dispersed in the same transparent resin only in the particle concentration, and is integrated in structure. That is, when the light guide sheet 30 is divided on the basis of the boundary surface Z and the boundary surface Y, the particle concentration in each region is different, but the boundary surface Z and the boundary surface Y are virtual lines.
  • the layer 60, the second layer 62, and the third layer 64 are integrated.
  • the particle concentration of the scattering particles in the first layer 60 is Np1
  • the particle concentration of the scattering particles in the second layer 62 is Np2
  • the particle concentration of the scattering particles in the third layer is Np3, Np1, Np2, and Np3
  • the relationship is Np1 ⁇ Np2 ⁇ Np3. That is, the light guide sheet 30 has a higher particle concentration of scattering particles in the layer on the curved portion 30h (back side) side than in the layer on the light exit surface 30a side.
  • a monomer resin in which scattering particles are dispersed on a produced base film by producing a base film containing scattering particles as a first layer by an extrusion molding method or the like After applying the liquid (transparent resin liquid), the monomer resin liquid is cured by irradiating with ultraviolet rays or visible light to produce the second and third layers of the desired particle concentration.
  • the monomer resin liquid is cured by irradiating with ultraviolet rays or visible light to produce the second and third layers of the desired particle concentration.
  • the light guide sheet 30 is shaped so as to become thicker as it is away from the light incident surface (30d, 30e), and the particle concentration in the light guide sheet 30 is changed between the first layer 60, the second layer 62, and the third layer 64.
  • the particle concentration of the first layer 60 on the light emitting surface 30a side is set to be lower than the particle concentration of the second layer 62, and the particle concentration of the third layer 64 on the curved portion 30h (back side) side is set to the second layer.
  • the concentration higher than the particle concentration of 62 By making the concentration higher than the particle concentration of 62, as the distance from the light incident surfaces 30d and 30e increases (towards the center of the two light incident surfaces), the composite particle concentration of the scattering particles gradually increases, so that As the distance from the incident surfaces 30d and 30e increases, the amount of light reflected toward the light exit surface 30a increases due to the action of the scattering particles.
  • the light guide sheet having one type of density that is, the overall density is uniform. Compared to the light guide sheet) It can be made uniform illuminance distribution in such proportions.
  • the effect similar to that of a flat light guide sheet provided with a concentration distribution of scattering particles in the depth direction can be exhibited, and the luminance distribution (concentration distribution of scattering particles) can be arbitrarily adjusted by adjusting the shape of the back surface. And the light utilization efficiency can be maximized.
  • the illuminance distribution can be made uniform even when the light guide sheet is made thin and flexible, and the light utilization efficiency can be improved.
  • the composite particle concentration is derived from the amount of scattered particles added (synthesized) in a direction perpendicular to the light exit surface at a certain position away from the light entrance surface toward the other entrance surface. It is the density
  • the light guide sheet can be made flexible, that is, a flexible light guide sheet can be obtained. It becomes possible to deform into a shape, and the surface of the light guide sheet can be formed into various curved surfaces.
  • the light guide sheet flexible, for example, when a planar illumination device using the light guide sheet is used as illumination (illumination) or illumination, it can be attached to a wall having a curvature, The planar lighting device can be used for more types of lighting, lighting, etc. in a wider usage range.
  • casing is formed corresponding to the curved surface, and accommodates and supports the light guide sheet formed in the curved surface.
  • the back surface of the light guide sheet has an inverted wedge shape having two inclined surfaces.
  • the present invention is not limited to this, and the back surface has a curved surface or a flat surface (that is, a flat plate shape). Light guide sheet) or a combination of these.
  • the back surface may have a wedge shape that is inclined in a direction approaching the light emitting surface as the distance from the light incident surface increases. What is necessary is just to select the shape of the back surface of a light guide sheet suitably according to the performance calculated
  • a back surface shape that is inclined in a direction approaching the light exit surface as it goes toward the center of the light guide sheet is suitable.
  • the back surface shape inclined in the direction away from a light-projection surface is suitable as it goes to the center of a light guide sheet.
  • the light emitting surface 30a is a rectangular flat surface.
  • the present invention is not limited to this, and the light emitting surface may be a concave surface that approaches the back surface as the distance from the light incident surface increases. Good.
  • the light exit surface concave it is possible to reduce the contact of the light guide sheet with the liquid crystal display device by warping the light exit surface when the light guide sheet expands and contracts.
  • luminance of a center part can be made high by making a light guide sheet into the shape which becomes thin as it goes to the center.
  • the light guide sheet is composed of three layers having different particle concentrations of the scattering particles
  • the present invention is not limited to this, and may be a light guide sheet having two or more layers, or alternatively, A light guide sheet having a uniform particle concentration of scattering particles may be used.
  • the light guide sheet is composed of a plurality of layers having different particle concentrations, it is preferable to adjust the particle concentration of each layer so that the synthetic particle concentration increases as the distance from the light incident surface increases. By increasing the synthetic particle concentration as the distance from the light incident surface increases, light incident from the light incident surface can be guided to the back of the light guide sheet, so that the light emitted from the light output surface can be made uniform. can do.
  • the light guide sheet 110 shown in FIG. 5A has the same configuration as the light guide sheet 30 except that the light guide sheet 30 shown in FIG. 3 is a light guide sheet composed of two layers having different particle concentrations of scattering particles. Therefore, the same portions are denoted by the same reference numerals, and the following description will mainly be made on different portions.
  • the light guide sheet 110 includes a first layer 112 on the light emitting surface 30a side, and a second layer 114 on the back surface (first inclined surface 30b and second inclined surface 30c) side having a higher concentration of scattering particles than the first layer 112. Are formed in a two-layer structure.
  • the boundary surface Z between the first layer 112 and the second layer 114 is formed at a position where two opposing sides are included in the first light incident surface 30d and the second light incident surface 30e, respectively, and
  • the light emitting surface 30a is formed in parallel. That is, the light guide sheet 110 has a rectangular first shape that forms part of the light emitting surface 30a and the light incident surface (the first light incident surface 30d and the second light incident surface 30e) with the boundary surface Z as a boundary.
  • the layer 112 includes a second layer 114 that forms part of the light incident surface and an inclined surface and has a particle concentration higher than that of the first layer 112.
  • the light guide sheet by configuring the light guide sheet with two layers having different particle concentrations of the scattering particles, it is possible to emit illumination light from the light exit surface 30a with low brightness unevenness and illuminance unevenness at medium and high levels. Utilization efficiency can be improved.
  • the light guide sheet 120 shown in FIG. 5 (B) is a light guide sheet except that the light guide sheet 120 shown in FIG. 3 has a flat back surface and is composed of two layers having different particle concentrations of scattering particles.
  • 30 have the same configuration, the same parts are denoted by the same reference numerals, and the following description will mainly focus on different parts.
  • the light guide sheet 120 is a light guide sheet having a flat plate shape and having two layers with different particle concentrations inside. That is, the light guide sheet 120 has a back surface 120b formed in a flat plane parallel to the light emitting surface 30a.
  • the inside of the light guide sheet 120 is a curved surface having a shape that is separated from the back surface 120b toward the center of the light guide sheet 120 from the end on the back surface 120b side of the light incident surface (30d and 30e), that is, the light guide sheet.
  • a curved surface having a shape approaching the light emitting surface 30a toward the center of 120 is defined as a boundary surface Y, and includes a first layer 122 on the light emitting surface 30a side and a second layer 124 on the back surface 120b side. That is, the first layer 122 on the light emitting surface 30 a side has a shape that becomes thinner toward the center of the light guide sheet 120, and the second layer 124 on the back surface 120 b side becomes thicker toward the center of the light guide sheet 120.
  • the scattering particles are dispersed so that the particle concentration of the second layer 124 is higher than that of the first layer 122.
  • the area of the light incident surface can be increased even when a film-like light guide sheet having a thickness of 1 mm or less is formed, and light is incident. Efficiency can be improved.
  • the inside of the light guide sheet is composed of two layers having different particle concentrations of scattering particles, and the thickness of the second layer having a higher particle concentration is increased toward the center of the light guide plate. Even when the shape of the light sheet is a flat plate, a medium-high luminance distribution can be realized.
  • the light guide sheet 140 shown in FIG. 5C has the same configuration as the light guide sheet 120 except that the light emitting surface of the light guide sheet 120 shown in FIG. Reference numerals are attached, and the following description mainly focuses on different parts.
  • the light guide sheet 140 is a light guide sheet that has a light exit surface formed as a concave surface and has two layers with different particle concentrations.
  • the light exit surface 140a of the light guide sheet 140 is formed as a concave surface that is curved so as to approach the back surface 120b as the distance from the light incident surface (30d, 30e) increases.
  • the inside of the light guide sheet 140 includes a first layer 142 on the light output surface 140a side and a back surface with a boundary surface Y that is a curved surface approaching the light output surface 140a toward the center of the light guide sheet 140.
  • the second layer 124 on the 120b side That is, the first layer 142 on the light emitting surface side has a shape that becomes thinner toward the center of the light guide sheet 140.
  • the particle concentration of the first layer 142 is lower than the particle concentration of the second layer 124.
  • a film-shaped light guide sheet having a thickness of 1 mm or less was used.
  • the thickness of the light guide sheet of the present invention is not particularly limited, and is a light guide sheet having a thickness of several millimeters. May be.
  • the surface of the light guide sheet 30 is preferably provided with a hard coat.
  • a hard coat By applying a hard coat to the surface of the light guide sheet 30, it is possible to prevent the surface of the light guide sheet 30 from being damaged.
  • the surface of the film-like light guide sheet having a thickness of 1 mm or less is hard-coated.
  • the refractive index of the hard coat material is preferably 1.43 to 1.65, and more preferably the same as the refractive index of the light guide sheet 30. By setting the refractive index of the hard coat material within this range, it is possible to prevent light from being scattered when light enters the light guide sheet 30.
  • the thickness of the hard coat is preferably several ⁇ m to several tens of ⁇ m.
  • the optical path in the hard coat material is sufficiently small compared to the length of light guided from the incident to the output (total optical path length), so the influence of light absorption by the hard coat material is minimized. It is possible to prevent color unevenness from occurring in the emitted light.
  • a hard-coat material it is more preferable that there is little absorption of light.
  • a plasticizer in said transparent resin By producing the light guide sheet with a material in which a transparent material and a plasticizer are mixed, the light guide sheet can be made more flexible, and the light guide sheet can be further easily deformed into various shapes. It can be used for many applications.
  • phthalate ester specifically, dimethyl phthalate (DMP), diethyl phthalate (DEP), dibutyl phthalate (DBP), di-2-ethylhexyl phthalate (DOP (DEHP)) ), Di-normal octyl phthalate (DnOP), diisononyl phthalate (DINP), dinonyl phthalate (DNP), diisodecyl phthalate (DIDP), phthalic acid mixed ester (C 6 -C 11 ) (610P, 711P, etc.) And butylbenzyl phthalate (BBP).
  • DMP dimethyl phthalate
  • DEP diethyl phthalate
  • DBP dibutyl phthalate
  • DOP di-2-ethylhexyl phthalate
  • DnOP Di-normal octyl phthalate
  • DINP diisononyl phthalate
  • DNP dinonyl phthalate
  • dioctyl adipate DOA
  • diisononyl adipate DINA
  • di-normal alkyl adipate C6, 8, 10
  • dialkyl adipate C7, 9
  • dioctyl azelate DOZ
  • dibutyl sebacate DBS
  • dioctyl sebacate DOS
  • tricresyl phosphate TCP
  • tributyl acetylcitrate ATBC
  • ESBO epoxidized soybean oil
  • trimellitic acid examples include trioctyl (TOTM), polyester, and chlorinated paraffin.
  • the LED array 28 will be described.
  • a plurality of LED arrays 28 are arranged in the longitudinal direction of the light incident surfaces (30d, 30e) in a state of being spaced apart from each other by a light guide.
  • the sheet 30 is bonded and supported on the upper guide reflection film 36 disposed on the light incident surface (30d, 30e) side end of the light emitting surface 30a of the sheet 30.
  • the upper guide reflection film 36 will be described in detail later.
  • FIG. 6 is a schematic perspective view showing a schematic configuration of the LED array 28 of the backlight unit 20 shown in FIGS. 1 and 2.
  • the LED array 28 includes a plurality of light emitting diode chips (hereinafter referred to as “LED chips”) 50 and an LED array substrate 52.
  • LED chips light emitting diode chips
  • the LED chip 50 is a chip in which a fluorescent material is applied to the surface of a light emitting diode that emits blue light.
  • the LED chip 50 has a light emitting surface 58 having a predetermined area, and emits white light from the light emitting surface 58. That is, when the blue light emitted from the surface of the light emitting diode of the LED chip 50 passes through the fluorescent material, the fluorescent material fluoresces. Accordingly, white light is generated and emitted from the LED chip 50 by the blue light emitted from the light emitting diode and the light emitted by the fluorescent substance fluorescent.
  • the LED chip 50 a so-called pseudo white light emitting diode such as a chip in which a YAG (yttrium, aluminum, garnet) fluorescent material is coated on the surface of a GaN light emitting diode, InGaN light emitting diode or the like can be used.
  • the LED chip 50 is not limited to a pseudo white light emitting diode, and may be configured to emit white light using three color light emitting diodes.
  • the thickness of the LED chip 50 in the direction perpendicular to the light exit surface 30a of the light guide sheet 30 is greater than the thickness of the light entrance surface (30d, 30e) of the light guide sheet 30 in the direction perpendicular to the light exit surface 30a. Is preferably small.
  • the distance between the light emitting surface 58 of the LED chip 50 and the light incident surface (30d, 30e) of the light guide sheet 30 is not particularly limited, but the LED array 28 and the light guide sheet 30 are bonded. Therefore, the distance between the light emitting surface 58 of the LED chip 50 and the light incident surface (30d, 30e) of the light guide sheet 30 can be reduced, and the light incident efficiency can be improved. it can.
  • the distance between the light emitting surface 58 of the LED chip 50 and the light incident surface (30d, 30e) of the light guide sheet 30 is preferably 0.05 mm or more in consideration of tolerances.
  • the thickness is 58 or less than 1/5 of the thickness in the direction perpendicular to the light exit surface 30a of the light guide sheet 30.
  • the distance between the light emitting surface 58 of the LED chip 50 and the light incident surface (30d, 30e) of the light guide sheet 30 within this range, the light of the light emitting surface 58 of the LED chip 50 and the light of the light guide sheet 30 is obtained.
  • the incident efficiency of light can be improved without contact with the incident surfaces (30d, 30e).
  • a sealing agent 70 is disposed between the light emitting surface 58 of the LED chip 50 and the light incident surface (30d, 30e) of the light guide sheet 30.
  • the sealing agent 70 it is preferable to use a silicone-based or acrylic-based adhesive having a refractive index close to that of the transparent resin forming the light guide sheet 30.
  • the LED chips 50 are preferably arranged discretely with gaps between the adjacent LED chips 50, and the light emitting surface 58 of the LED chip 50 is incident on the light guide sheet 30. It is preferable to adhere to the surface. The distance between the light incident surface of the light guide sheet 30 and the LED chip 50 even if the light guide sheet 30 expands and contracts by adhering the LED chips 50 to the light incident surface of the light guide sheet 30 and discretely arranging them. Therefore, it is possible to prevent a decrease in light use efficiency. In order to arrange the LED chip by adhering to the light incident surface of the light guide sheet 30, it is desirable to use an adhesive having an expansion / contraction rate larger than that of the light guide plate base material. Silicone adhesives are suitable for this application. The size of the gap between the LED chips 50 is not particularly limited, and may be set as appropriate according to the performance of the LED chips, the performance required for the backlight unit, and the like.
  • the LED array substrate 52 is a member that holds the LED chip 50 so that the light emitting surface 58 faces the light incident surface (30d, 30e) of the light guide sheet 30, and a plate-like LED that holds the LED chip 50.
  • a support 54, a plate-like adhesive portion 56 for adhering and fixing the LED array 28 to the upper guide reflection film 36 disposed on the light guide sheet 30, and electrical wiring 68 connected to the LED array 28 are accommodated.
  • a wiring storage portion 66 The LED array substrate 52 supports the plurality of LED chips 50 on the surface of the LED support portion 54 on the light guide sheet 30 side in a state of being spaced apart from each other by a predetermined distance.
  • the plurality of LED chips 50 constituting the LED array 28 are arranged in an array along the longitudinal direction of the first light incident surface 30d or the second light incident surface 30e of the light guide sheet 30, and the LEDs It is fixed on the LED support portion 54 of the array substrate 52.
  • the wiring housing portion 66 is a portion having a concave cross section perpendicular to the longitudinal direction of the light incident surfaces (30d, 30e) of the light guide sheet 30 disposed on the opposite side of the light guide sheet 30 with the LED chip 50 interposed therebetween. Yes, it is a part that houses the electrical wiring 68 of the LED array 28.
  • the length in the longitudinal direction of the light incident surfaces (30d, 30e) of the light guide sheet 30 of the LED array 28 disposed on the upper guide reflection film 36 disposed on the light output surface 30a of the light guide sheet 30 is not particularly limited, but the length of the LED array 28 is 10 mm in that it is easy to follow expansion / contraction, deformation, or the like of the light guide sheet 30. As mentioned above, 200 mm or less is preferable. Also, the arrangement interval of the LED array 28 is not particularly limited, and the length of the LED array 28, the formation material of the LED array substrate 52, the arrangement interval of the LED chips 50, the amount of expansion and contraction of the light guide sheet 30, and deformation.
  • the arrangement interval of the LED arrays 28 is narrow in terms of making the arrangement interval of the LED chips 50 constant. Further, the heat of the LED array substrate 52 and the light guide sheet 30 is preferable. In consideration of the amount of expansion / extension due to moisture absorption, the arrangement interval of the LED array 28 is preferably 0.1 mm or more and 2 mm or less.
  • the length of the LED array 28 is L LED
  • the length of the light incident surface (30d, 30e) of the light guide sheet 30 in the longitudinal direction is L LGP
  • the linear expansion coefficient of the light guide sheet 30 is ⁇ l
  • the LED array 28 If the allowable expansion / contraction length of the adhesive that bonds the light guide sheet 30 is L BIND , the expansion / contraction length of the light guide sheet 30 for one LED array is ⁇ l ⁇ (L LED / L LGP ).
  • ⁇ l ⁇ (L LED / L LGP ) ⁇ L BIND is a condition for preventing the LED array 28 and the light guide sheet 30 (upper guide reflection film 36) from peeling off, and the length of the LED array 28 to satisfy this equation It is preferable to set the L LED .
  • the width of the bonding portion 56 of the LED array substrate 52 in the direction perpendicular to the light incident surface (30d, 30e) of the light guide sheet 30 is preferably 10 to 20 mm. By making the width of the bonding portion 56 of the LED array substrate 52 within this range, the bonding portion 56 of the LED array substrate 52 and the upper guide reflection film 36 disposed on the light guide sheet 30 are more reliably bonded. Can do.
  • the LED array substrate 52 is formed by attaching a flexible plastic circuit (FPC) to a metal substrate having good thermal conductivity such as aluminum.
  • the LED array substrate 52 may be composed of only FPC. However, it is preferable that the FPC is attached to a metal substrate in order to efficiently dissipate heat generated from the LED chip 50. Further, the LED array substrate 52 may be provided with fins or a heat pipe that transfers heat to the heat radiating member.
  • various adhesives such as a silicone-based adhesive and an adhesive tape are used.
  • a mechanical mechanism becomes unnecessary, and the LED array 28 and the upper guide reflection are reduced even if the backlight unit is thinned.
  • the film 36 can be securely fixed.
  • the cost can be reduced, and the backlight unit can be made thinner.
  • the LED array 28 and the light guide sheet 30 expand / contract due to heat and moisture.
  • the LED array 28 and the light guide sheet 30 have different linear expansion coefficients, the LED array 28 and the light guide sheet 30.
  • an adhesive or a pressure-sensitive adhesive tape that can be elastically deformed and can absorb the positional deviation between the LED array 28 and the light guide sheet 30.
  • the LED chip 50 of the LED array 28 generates heat, it is preferable to use a heat-resistant adhesive or adhesive tape.
  • the LED array 28 in which a plurality of LED chips 50 are arranged is placed on the upper guide reflection film 36 disposed on the light incident surface (30d, 30e) side end of the light emitting surface 30a of the light guide sheet 30.
  • the light guide sheet may expand or contract due to heat or moisture absorption, or may be guided by vibration or the like.
  • the fall of the utilization efficiency of light can be prevented, the incident light can be guided to the back of a light-guide plate, and uniform illumination can be performed. Further, when the light guide sheet is used while being bent, the light guide sheet can be not only in a curved state as viewed in the longitudinal direction of the light incident surface but also in a curved state as viewed in a direction perpendicular to the light incident surface.
  • the bonding portion 56 of the LED array substrate 52 is bonded to the upper guide reflection film 36 from the light emitting surface 30 a side of the light guide sheet 30.
  • the present invention is not limited to this, and the light guide sheet 30 is not limited thereto. You may make it adhere
  • FIG. 7 is a schematic perspective view showing a part of the light guide sheet 30 and the upper guide reflection film 36 of the backlight unit shown in FIG.
  • the upper guide reflection film 36 is provided to reflect light leaking from the light exit surface 30 a in the vicinity of the light incident surfaces (30 d, 30 e) of the light guide sheet 30 so as to enter the light guide sheet 30 again. Thereby, the incident efficiency of light can be improved.
  • the plurality of upper guide reflection films 36 are disposed between the light guide sheet 30 and the LED array 28, that is, the end of the light exit surface 30a of the light guide sheet 30 (the end on the first light incident surface 30d side and the second light). (The end on the incident surface 30e side) are arranged so as to cover each other.
  • the LED array 28 is adhered and disposed on the surface of the upper guide reflection film 36 on the side opposite to the surface on the light guide sheet 30 side.
  • the upper guide reflection film 36 is disposed so that a part of the upper guide reflection film 36 overlaps with the adjacent upper guide reflection film 36 in the longitudinal direction of the light incident surface (30d, 30e) of the light guide sheet 30.
  • the portion of the upper guide reflection film 36 that contacts the light guide sheet 30 is bonded and fixed. Further, one of the portions overlapping with the adjacent upper guide reflection film 36 is bonded to the light guide sheet 30, but the other is not fixed and can slide on the other upper guide reflection film 36. It is.
  • the light guide sheet 30 expands / shrinks due to heat or moisture by arranging the adjacent upper guide reflection films 36 so as to partially overlap each other, and the light guide sheet 30 and the upper guide reflection film 36 Even when the position of the light guide sheet 30 is shifted, it is possible to absorb the amount of misalignment between the light guide sheet 30 and the upper guide reflection film 36, and even when the light guide sheet 30 expands, the upper guide reflection film 36 is It is possible to cover the light incident surface (30d, 30e) side of the 30 light emitting surface 30a without any gap, thereby preventing a decrease in light incident efficiency.
  • the length of the upper guide reflection film 36 in the longitudinal direction of the light incident surface (30d, 30e) of the light guide sheet 30 (hereinafter referred to as “the length of the upper guide reflection film”, the same applies to the lower guide reflection film).
  • the length of the LED array 28 and the length of two gaps between the adjacent LED arrays 28 are added, and the LED array 28 is bonded to a portion that does not overlap with the adjacent upper guide reflection film 36. Yes.
  • the upper guide reflection film 36 may be formed of any material as long as it can reflect light leaking from the light incident surface (30d, 30e) side end of the light exit surface 30a of the light guide sheet 30.
  • a resin sheet in which a void is formed by kneading and stretching a filler in PET, PP (polypropylene) or the like to increase the reflectance a sheet having a mirror surface formed by aluminum vapor deposition on the surface of a transparent or white resin sheet, aluminum It can be formed of a metal foil such as a resin sheet carrying a metal foil, or a metal thin plate having sufficient reflectivity on the surface.
  • the upper guide reflection film 36 is disposed on the light incident surface (30d, 30e) side end portion of the light emitting surface 30a of the light guide sheet 30, so that the light emitted from the LED array 28 is guided to the light guide sheet. It is possible to prevent leakage to the light exit surface 30a side without entering the light source 30 and leakage of light incident on the light guide sheet 30 from the portion of the light exit surface 30a to which the LED array 28 is bonded. . Thereby, the light emitted from the LED array 28 can be efficiently incident on the first light incident surface 30d and the second light incident surface 30e of the light guide sheet 30, and the light incident efficiency can be improved.
  • the lower guide reflection film 38 reflects light leaking from the back surface (the first inclined surface 30b and the second inclined surface 30c) in the vicinity of the light incident surfaces (30d, 30e) of the light guide sheet 30, and again the light guide sheet 30.
  • the incident efficiency of light can be improved.
  • the plurality of lower guide reflection films 38 are provided at the end portions (the first light incident surface 30d side end portion and the second light incident surface 30e side) of the rear surface (first inclined surface 30b and second inclined surface 30c) of the light guide sheet 30. Are arranged so as to cover the end of each of them.
  • the lower guide reflection film 38 is disposed so as to partially overlap the adjacent lower guide reflection film 38 in the longitudinal direction of the light incident surface (30d, 30e) of the light guide sheet 30. A portion in contact with the light guide sheet 30 is bonded and fixed. In addition, one of the portions overlapping with the adjacent lower guide reflection film 38 is fixed to the light guide sheet 30, but the other is not fixed and is slidable.
  • the light guide sheet 30 expands / shrinks due to heat or moisture by arranging the adjacent lower guide reflection films 38 to overlap each other, and the light guide sheet 30 and the lower guide reflection film 38 Even when the position of the light guide sheet 30 is shifted, it is possible to absorb the amount of misalignment between the light guide sheet 30 and the lower guide reflection film 38, and when the light guide sheet 30 is expanded, the lower guide reflection film 38 is
  • the light incident surface (30d, 30e) side of the back surface (30b, 30c) of 30 can be covered without a gap, thereby preventing a decrease in light incident efficiency.
  • the lower guide reflection film 38 various materials used for the upper guide reflection film 36 described above can be used.
  • the width of the upper guide reflection film 36 and the lower guide reflection film 38 in the direction perpendicular to the light incident surface of the light guide sheet 30 (hereinafter, “the width of the upper guide reflection film” and “the width of the lower guide reflection film”). Is not particularly limited, but is preferably longer than the width of the bonding portion 56 of the LED array substrate 52.
  • the length of the lower guide reflection film 38 is not particularly limited, but is the same length as the upper guide reflection film 36 (that is, the length of the LED array 28 and two gaps between the adjacent LED arrays 28). It is preferable that the length of the LED array 28 and five gaps between adjacent LED arrays 28 are added to the length. By setting the length of the lower guide reflection film 38 within this range, it becomes easier to follow the expansion and contraction, deformation, etc. of the light guide sheet 30, and the positional relationship between the lower guide reflection film 38 and the light guide sheet 30 can be maintained appropriately. it can.
  • the reflection film 34 is provided to reflect light leaking from the back surface (the first inclined surface 30b, the second inclined surface 30c, and the curved portion 30h) of the light guide sheet 30 and to make it incident on the light guide sheet 30 again. It is a flat plate-shaped member, and the light utilization efficiency can be improved.
  • derivation reflective film 36 mentioned above can be used as the reflective film 34.
  • the reflective film 34 has a flat plate shape, but may have a shape corresponding to the back surface of the light guide sheet 30 so as to cover the back surface.
  • the reflective film 34 may also be formed in a shape that complements this.
  • the optical member unit 32 is for making the illumination light emitted from the light emitting surface 30a of the light guide sheet 30 light with more uneven brightness and illuminance and emitting it from the light emitting surface 24a of the illuminating device body 24.
  • a diffusion sheet 32a that diffuses illumination light emitted from the light emitting surface 30a of the light guide sheet 30 to reduce luminance unevenness and illuminance unevenness, light incident surfaces 30d and 30e, and light emitting surface 30a.
  • the prism sheet 32b in which microprism rows parallel to the tangent line are formed, and the diffusion sheet 32c that diffuses the illumination light emitted from the prism sheet 32b to reduce luminance unevenness and illuminance unevenness.
  • the diffusion sheets 32a and 32c and the prism sheet 32b are not particularly limited, and known diffusion sheets and prism sheets can be used.
  • Japanese Patent Application Laid-Open No. 2005-23497 related to the application of the present applicant [ The ones disclosed in [0028] to [0033] can be applied.
  • the optical member unit is constituted by the two diffusion sheets 32a and 32c and the prism sheet 32b disposed between the two diffusion sheets.
  • the arrangement order and arrangement of the prism sheets and the diffusion sheets are not limited.
  • the number is not particularly limited, and is not particularly limited as a prism sheet or a diffusion sheet, and it is possible to further reduce luminance unevenness and illuminance unevenness of illumination light emitted from the light emitting surface 30a of the light guide sheet 30. If so, various optical members can be used.
  • a transmittance adjusting member in addition to or instead of the above-described diffusion sheet and prism sheet, a transmittance adjusting member in which a large number of transmittance adjusting bodies made of a diffuse reflector are arranged in accordance with luminance unevenness and illuminance unevenness is also used. You can also. Further, the optical member unit may have a two-layer configuration using one prism sheet and one diffusion sheet, or using only two diffusion sheets.
  • the optical member unit 32 is disposed between the sliding member 76 of the fixing means 22 and the upper housing 44, which will be described in detail later, the optical member unit 32 can be easily taken out by removing the upper housing 44. Therefore, the optical member unit 32 can be easily changed according to the application. In addition, the deflection of the sheet constituting the optical member unit 32 can be suppressed.
  • the housing 26 accommodates and supports the lighting device main body 24, and is sandwiched and fixed from the light emitting surface 24 a side and the back side of the light guide sheet 30.
  • the body 42, the upper housing 44, the upper spacer 72, and the lower spacer 74 are included.
  • the housing accommodates and supports the planar light guide sheet 30 (illuminating device main body 24).
  • the housing is formed in a shape corresponding to the curved surface of the light guide sheet.
  • the lower housing 42 has a shape having an open top surface, a bottom surface portion, and a side surface portion provided on four sides of the bottom surface portion and perpendicular to the bottom surface portion. That is, it is a substantially rectangular parallelepiped box shape with one surface open. As shown in FIG. 2, the lower housing 42 supports the illuminating device main body 24 accommodated from above by the bottom surface portion and the side surface portion, and also a surface other than the light emitting surface 24 a of the illuminating device main body 24, that is, the illuminating device. The main body 24 covers the surface (back surface) and the side surface opposite to the light emitting surface 24a.
  • the upper housing 44 has a rectangular parallelepiped box shape in which a rectangular opening smaller than the rectangular light emitting surface 24a of the lighting device body 24 serving as an opening is formed on the upper surface, and the lower surface is opened.
  • the upper housing 44 includes the lighting device main body 24 and the lower housing 42 in which the lighting device main body 24 and the lower housing 42 are housed from above the lighting device main body 24 and the lower housing 42.
  • the side portion is also placed so as to cover the side portion.
  • various materials such as a metal and resin, can be used for the upper housing
  • a material it is preferable to use a lightweight and high-strength material.
  • the upper spacer 72 is disposed between the LED array substrate 52 and the upper housing 44, and the LED array substrate 52 and the light guide sheet 30 fixed integrally with the LED array substrate 52 are disposed in the housing 26.
  • the upper spacer 72 is a member that extends in the longitudinal direction of the light incident surface (30d, 30e) of the light guide sheet 30 and has a rectangular cross section perpendicular to the extending direction.
  • the upper spacer 72 may have any shape as long as the LED array substrate 52 can be restricted from moving in the direction perpendicular to the light emitting surface 30 a of the light guide sheet 30.
  • the lower spacer 74 is disposed between the LED array substrate 52 and the lower housing 42, and the LED array substrate 52 and the light guide sheet 30 fixed integrally with the LED array substrate 52 are disposed in the housing 26.
  • the lower spacer 74 is a member that extends in the longitudinal direction of the light incident surface (30d, 30e) of the light guide sheet 30 and has a rectangular cross section perpendicular to the extending direction.
  • the lower spacer 74 may have any shape as long as the LED array substrate 52 can be restricted from moving in the direction perpendicular to the light emitting surface 30a of the light guide sheet 30.
  • the upper spacer 72 and the lower spacer 74 can be made of various materials such as metal and resin, and preferably have cushioning properties. Further, although the upper spacer 72 and the lower spacer 74 are provided independently of each other, the present invention is not limited to this, and may be formed integrally with the upper housing 44 and the lower housing 42, respectively.
  • the fixing means 22 supports the light guide sheet 30 so as to be slidable within the housing 26, and includes a sliding member 76, a first fixing member 78, and a second fixing member. 80 and fixing pins 82 and 84.
  • the sliding member 76 includes the light guide sheet 30, the LED array 28 fixed integrally with the light guide sheet 30, the upper guide reflection film 36, and the lower guide reflection film 38 within the housing 26. It is a member for preventing and holding movement in a direction perpendicular to the light emitting surface 30a so as to be slidable in a direction parallel to the light emitting surface 30a.
  • the sliding member 76 is between the LED array substrate 52, the upper spacer 72 and the optical member unit 32, and between the LED array substrate 52 and the lower guide reflection film 38, and the lower spacer 74 and the reflection film 34, respectively. Has been placed.
  • any material may be used as long as the light guide sheet 30 and the member fixed to the light guide sheet 30 can be slidably held.
  • Teflon registered trademark
  • a fluororesin such as can be used.
  • the light guide sheet 30 and the member fixed to the light guide sheet 30 are slidably held by the slide member 76.
  • 30 and the member fixed to the light guide sheet 30 can move (expand / contract) in a direction parallel to the light emitting surface 30a within the housing 26, and therefore the light guide sheet 30 is deformed by expansion / contraction of the light guide sheet 30. Can be prevented.
  • the first fixing member 78 is a part that engages with a fixing pin 82 described later and positions the light guide sheet 30 with respect to the housing 26.
  • the first fixing member 78 is a plate-like member having a round hole 78a, and the first light incident surface 30d of the light guide sheet 30 is engaged so that the round hole 78a is engaged with the fixing pin 82 fixed to the housing 26. It is fixed at one corner of the side.
  • the second fixing member 80 is a part for engaging with a fixing pin 84 described later and positioning the light guide sheet 30 with respect to the housing 26.
  • the second fixing member 80 is a plate-like member having a long hole 80a in a direction in which the direction perpendicular to the light incident surface (30d, 30e) of the light guide sheet 30 is the long axis direction.
  • the light guide sheet 30 is fixed to a corner of the light guide sheet 30 opposite to the first fixing member 78 so as to engage with the fixed pin 84 that is fixed.
  • the 1st fixing member 78 and the 2nd fixing member 80 are plate-shaped members formed with the material whose intensity
  • the upper reinforcing member is preferably formed of super engineer plastic or metal.
  • examples of the metal include aluminum alloy and stainless steel.
  • the fixing pin 82 is fixed to the housing 26 and is inserted into the round hole 78 a of the first fixing member 78.
  • the fixing pin 84 is fixed to the housing 26 and is inserted through the long hole 80 a of the second fixing member 80.
  • the fixing unit 22 prevents the light guide sheet 30 (and the member fixed to the light guide sheet 30) from moving in the direction perpendicular to the light emitting surface 30a by the sliding member 76. It is slidably held in a direction parallel to the light emitting surface 30a. Further, the first fixing member 78 having the round hole 78a engages with the fixing pin 82, and the second fixing member 80 having the long hole 80a in the direction in which the longitudinal direction of the light incident surface (30d, 30e) becomes the major axis direction. Is engaged with the fixing pin 84, the end of the light guide sheet 30 on the side on which the first fixing member 78 and the second fixing member 80 are fixed is the length of the light incident surface (30d, 30e).
  • the corner that is fixed in the direction and to which the second fixing member 80 is fixed is movable in a direction perpendicular to the light incident surface (30d, 30e).
  • the ends on the side where the first fixing member 78 and the second fixing member 80 are not fixed are the longitudinal direction of the light incident surfaces (30d, 30e) and the direction perpendicular to the light incident surfaces (30d, 30e). It is possible to move.
  • the fixing means 22 prevents the light guide sheet 30 from moving in the direction perpendicular to the light emitting surface 30a, and the longitudinal direction of the light incident surfaces (30d, 30e) and the light incident surface (30d). , 30e) in such a manner that the light guide sheet 30 expands and contracts due to heat and moisture, so that the expansion and contraction is not suppressed. Can be prevented.
  • the backlight unit 20 can be made thin by comprising the fixing means 22 by the sliding member 76 and the 1st fixing member 78 and the 2nd fixing member 80 which are plate-shaped members.
  • the backlight unit 20 is basically configured as described above.
  • light emitted from the LED arrays 28 disposed at both ends of the light guide sheet 30 is incident on the light incident surfaces (the first light incident surface 30 d and the second light incident surface 30 e) of the light guide sheet 30.
  • the light incident surfaces the first light incident surface 30 d and the second light incident surface 30 e
  • first inclined surface 30b, second inclined surface 30c the back surface
  • the light exits from the light exit surface 30a At this time, part of the light leaking from the back surface is reflected by the reflective film 34 and enters the light guide sheet 30 again.
  • the light emitted from the light emitting surface 30 a of the light guide sheet 30 passes through the optical member 32 and is emitted from the light emitting surface 24 a of the illuminating device body 24 to illuminate the liquid crystal display panel 12.
  • the liquid crystal display panel 12 displays characters, figures, images, and the like on the surface of the liquid crystal display panel 12 by controlling the light transmittance according to the position by the drive unit 14.
  • the LED array was comprised with the LED array board
  • FIG. 8 is a cross-sectional view schematically showing a part of another example of the backlight unit.
  • the backlight unit 100 shown in FIG. 8 has the same configuration except that it has the LED array 102 instead of the LED array 28 in the backlight unit 20 shown in FIG.
  • the following description mainly performs different parts.
  • the backlight unit 100 shown in FIG. 8 includes a light guide sheet 30, an LED array 102, an upper guide reflection film 36, and a lower guide reflection film 38. Although not shown, the backlight unit 100 also includes an optical member unit, a reflector, a housing, and a fixing unit, like the backlight unit 20.
  • the LED array 102 includes a plurality of LED chips 50 and two LED array substrates 104.
  • the two LED array substrates 104 are plate-like members, and the LED chip 50 disposed to face the light incident surface (30d, 30e) of the light guide sheet 30 is connected to the light emitting surface 30a side of the light guide sheet 30. They are respectively held from the back (first inclined surface 30b, second inclined surface 30c) side.
  • the positions of the two LED array substrates 104 corresponding to the light guide sheet 30 are respectively disposed at the end portions of the light guide sheet 30 on the side of the light emitting surface 30a and the rear light incident surface (30d, 30e).
  • the upper guide reflection film 36 and the lower guide reflection film 38 are adhered and fixed.
  • the LED array substrate is configured to have two plate-like members and the LED chip and the light guide sheet are sandwiched between them, the light guide sheet is stretched or warped by heat or moisture absorption, or is guided by vibration or the like.
  • the distance and the positional relationship between the light incident surface of the light guide sheet and the LED chip can be properly maintained. The use efficiency can be prevented from being lowered, and the incident light can be guided to the back of the light guide plate to perform uniform illumination.
  • the both-sides incidence which arranged the LED array in the two light-incidence surfaces of a light guide sheet it is not limited to this, As the one-sided incidence which arranged the LED array in one light-incidence surface Also good. Whether it is a double-sided incident or a single-sided incident may be appropriately selected according to the performance, cost, and the like required for the planar illumination device.
  • both-side incidence the amount of light incident on the light guide sheet can be increased, so that the amount of emitted light can be increased, and the illuminance distribution of the emitted light can be more suitably adjusted.
  • single-sided incidence the number of LEDs can be reduced, and the device configuration is simplified, so that the number of parts can be reduced and the cost can be reduced.
  • FIG. 9 is a schematic cross-sectional view showing a part of another example of the backlight unit of the present invention.
  • 9 has the light guide sheet 132 instead of the light guide sheet 30, and is the same as the backlight unit 20 except that the LED array is disposed only on one light incident surface side. Since it has a structure, the same code
  • the backlight unit 130 shown in FIG. 9 includes a light guide sheet 132, a plurality of LED arrays 28 arranged to face the first light incident surface 30 d of the light guide sheet 132, and between the light guide sheet 132 and the LED array 28. And the lower guided reflection film 38 disposed on the back surface 132b side of the light guide sheet 132.
  • the light guide sheet 132 includes a side surface 132e that is a surface facing the light incident surface 30d, and a back surface 132b that is inclined in a direction approaching the light emitting surface 30a as the distance from the light incident surface 30d increases. That is, the thickness of the light guide sheet 132 in the direction perpendicular to the light emitting surface 30a decreases as it goes from the light incident surface 30d to the side surface 132e. Further, scattering particles are uniformly kneaded and dispersed inside the light guide sheet 132.
  • the LED array 28 is disposed only on the light incident surface 30d side and is not disposed on the side surface 132e side.
  • the LED array is configured to be one-side incident arranged on one light incident surface of the light guide sheet
  • the plurality of LED arrays are arranged on the light incident surface side end of the light output surface of the light guide sheet.
  • the light guide sheet is stretched or warped due to heat or moisture absorption, or the light guide sheet is deformed by vibration or the like, the light incident surface of the light guide sheet and the LED chip are bonded.
  • the distance and the positional relationship can be kept appropriate. Thereby, the fall of the utilization efficiency of light can be prevented, the incident light can be guided to the back of a light-guide plate, and uniform illumination can be performed.
  • the shape of the light guide sheet may be a wedge shape whose thickness decreases as the distance from the light incident surface increases.
  • the LED array 28 and the light guide sheet 30 are bonded and fixed.
  • the present invention is not limited to this, and the LED array holds the light guide sheet.
  • the LED array and the light guide sheet may be fixed.
  • FIG. 10 (A) is a schematic plan view showing a part of another example of the backlight unit
  • FIG. 10 (B) is a sectional view taken along the line CC of FIG. 10 (A).
  • the backlight unit 200 shown in FIG. 10 has an LED array 202 and a connecting member 212 instead of the LED array 28 and the fixing means 22, and is replaced with the light guide sheet 30. Since it has the same configuration as the backlight unit 20 except that it has the light guide sheet 120 shown in FIG. 5 (B), the same portions are denoted by the same reference numerals, and the following description will mainly be performed on different portions.
  • the backlight unit 200 includes an optical member unit, a reflecting plate, and a housing, similarly to the backlight unit 20.
  • the LED array 202a includes a plurality of LED chips 50, an LED array substrate 204a, a fixing bolt 206a, and a fixing nut 206b.
  • the LED array substrate 204a is a member that extends in the longitudinal direction of the light incident surface (the first light incident surface 30d and the second light incident surface 30e) of the light guide sheet 120 and has a substantially C-shaped cross section perpendicular to the extending direction. It is. Specifically, a base having a surface facing the light incident surface of the light guide sheet 120, and both ends of the base (the both ends in the thickness direction of the light guide sheet 120) stand up against the base. And two plate-like standing portions to be provided.
  • a plurality of LED chips 50 are arranged on the base of the LED array substrate 204a facing the light incident surface of the light guide sheet 120 so that the light emitting surface 58 faces the light incident surface. Further, a screw hole into which a fixing screw 214 for fixing a connecting member 212 described later is screwed is formed on the surface of the base of the LED array substrate 204a opposite to the light incident surface.
  • the two standing portions of the LED array substrate 204a are disposed in close contact with the light emitting surface 30a and the back surface 120b of the light guide sheet 120, respectively.
  • an upper guide reflection film 36 and a lower guide reflection film 38 are disposed between the LED array substrate and the light guide sheet. Therefore, the standing portion of the LED array substrate 204 a is in close contact with the upper guide reflection film 36 and the lower guide reflection film 38 that are bonded to the light guide sheet 120.
  • two round holes for engaging with fixing bolts 206a described later are formed in the two standing portions of the LED array substrate 204a.
  • the fixing bolt 206a and the fixing nut 206b are for pressing the two standing portions of the LED array substrate 204a toward the light guide sheet 120 so that the two standing portions of the LED array substrate 204a hold the light guide sheet 120. It is a member.
  • the fixing bolts 206a are respectively inserted into two round holes formed in the standing portion of the LED array substrate 204a and screwed with the fixing bolts 206b.
  • the upper guide reflection film 36 in which the LED array 202a in which the plurality of LED chips 50 are arranged is arranged on the light incident surface (30d, 30e) side ends of the light emitting surface 30a and the back surface 120b of the light guide sheet 30.
  • the light guide sheet 120 can be expanded or contracted by heat or moisture absorption.
  • the distance and the positional relationship between the light incident surface of the light guide sheet and the LED chip are properly maintained. be able to. Thereby, the fall of the utilization efficiency of light can be prevented, the incident light can be guided to the back of a light-guide plate, and uniform illumination can be performed.
  • the LED array substrate 204a is configured to hold the light guide sheet 120 using the fixing bolt 206a and the fixing nut 206b.
  • the present invention is not limited to this, and the LED array substrate 204a is not limited thereto. It is good also as a structure which changes into one round hole of these two standing-up parts, forms a screw hole, and this and a fixing bolt are screwed together. Moreover, it is good also as a structure which clamps a light guide sheet by forming the gap
  • a first contact member that closely contacts the LED array substrate with the light exit surface of the light guide sheet, and a second contact member that is rotatably connected to the first contact member and contacts the back surface of the light guide sheet. It is good also as a structure which a 1st contact member and a 2nd contact member hold
  • the LED array substrate 204b of the LED array 202b has the same configuration as the LED array substrate 204a except that a round hole 208 is formed.
  • the LED array substrate 204b is disposed at one end of the first light incident surface 30d of the light guide sheet 120.
  • a round hole 208 for engaging with the fixing pin 82 is formed in the base of the LED array substrate 204b.
  • the LED array substrate 204c of the LED array 202c has the same configuration as the LED array substrate 204a except that the long hole 210 is formed.
  • the LED array substrate 204c is disposed at the end of the first light incident surface 30d of the light guide sheet 120 opposite to the side where the LED array 202b is disposed.
  • a long hole 210 is formed in the base of the LED array substrate 204c so that the longitudinal direction of the light incident surface is the major axis direction to engage with the fixing pin 84.
  • the light guide sheet 120 is prevented from moving in a direction perpendicular to the light exit surface 30a, and is expanded and contracted in the longitudinal direction of the light incident surface (30d, 30e) and in the direction perpendicular to the light incident surface (30d, 30e). Since the expansion and contraction is not suppressed when the light guide sheet 30 expands and contracts due to heat or moisture, the light guide plate can be prevented from warping in a direction perpendicular to the light emitting surface 30a.
  • the backlight unit 200 has the connection member 212 which connects an LED array as a preferable aspect.
  • the connecting member 212 is a member having elasticity that connects adjacent LED arrays 202 (LED arrays 202a, 202b, and 202c).
  • the connecting member 212 includes a connecting portion disposed in contact with a surface of the base of two adjacent LED array substrates 204 (LED array substrates 204a, 204b, and 204c) opposite to the light guide sheet, and the connecting portion. And a plate-like position restricting portion erected from the central portion of the surface on the light guide sheet side.
  • connection portion of the connection member 212 is provided with two round holes corresponding to the screw holes formed in the two adjacent LED array substrates 204, and the two LED array substrates are fixed by the fixing screws 214. 204.
  • the position restricting portion of the connecting member 212 is disposed between the two adjacent LED array substrates 204, and the gap between the adjacent LED arrays 202 is set to a predetermined size.
  • the connecting member 212 has elasticity, the LED array 202 can be connected without suppressing the expansion and contraction of the light guide sheet 120 even when the light guide sheet 120 expands and contracts due to heat and moisture.
  • the material of the connecting member 212 may be a stretchable material such as a resin such as polyacetal or polypropylene, or a metal spring. Further, by attaching the plurality of LED arrays 202 to the light guide sheet 120 in a state where the plurality of LED arrays 202 are connected by the plurality of connecting members 212, the assembly of the device is facilitated.
  • the shape of the connecting member is not limited to this, and it is sufficient that the LED array can be connected.
  • the connecting member 212 may have a plate shape that does not have the position restricting portion.
  • the means for connecting the connecting member and the LED array substrate is not limited to screwing, and various known fixing means such as adhesion by an adhesive or fixing by a fixing pin can be used.
  • the backlight unit 200 in the illustrated example has a double-sided incident configuration in which light is incident from two light incident surfaces. However, similarly to the backlight unit 130 illustrated in FIG. 9, light is transmitted from one light incident surface. It is good also as a structure of the one side incidence which injects.
  • planar lighting device has been described in detail according to the present invention.
  • the present invention is not limited to the above embodiment, and various improvements and modifications are made without departing from the gist of the present invention. Also good.
  • the LED array may be disposed to face the short side surface of the light emitting surface of the light guide sheet. Increasing the number of LED arrays can increase the intensity of light emitted from the device.
  • the said embodiment it is an upper induction
  • An organic layer containing a reflective pigment may be applied to the end on the 30e) side.
  • the reflective film was arrange

Abstract

L'invention porte sur un dispositif d'éclairage plan, qui est apte à empêcher la dilatation, la contraction et la courbure d'une plaque de guidage de lumière du fait de l'absorption de chaleur et d'humidité, et qui empêche des réductions de rendement d'utilisation de lumière pouvant être attribuées à des changements de la forme de plaque de guidage de lumière à partir de vibrations, et analogues ; et qui est apte à guider une lumière incidente vers l'arrière de la plaque de guidage de lumière et à réaliser un éclairage uniforme. Une pluralité d'unités de source de lumière sont disposées dans la direction d'étendue de la surface d'incidence de lumière d'une feuille de guidage de lumière, et elles ont une structure dans laquelle la surface de l'élément de support des unités de source de lumière et l'extrémité, sur le côté de surface d'incidence de lumière, d'au moins l'une soit de la surface de lumière sortante soit de la surface arrière de la feuille de guidage de lumière, sont amenées à adhérer et sont fixées l'une à l'autre.
PCT/JP2010/064754 2009-08-28 2010-08-30 Dispositif d'éclairage plan WO2011025017A1 (fr)

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JP2009198174 2009-08-28
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JP2010-186952 2010-08-24

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WO2012132485A1 (fr) * 2011-03-28 2012-10-04 富士フイルム株式会社 Dispositif d'éclairage plan
WO2012132510A1 (fr) * 2011-03-28 2012-10-04 富士フイルム株式会社 Dispositif d'éclairage plan
WO2012153615A1 (fr) * 2011-05-10 2012-11-15 富士フイルム株式会社 Dispositif d'éclairage de forme plane
JP2013089430A (ja) * 2011-10-18 2013-05-13 Kowa Co 照明装置
JP2014071378A (ja) * 2012-09-28 2014-04-21 Keiwa Inc 導光シート、エッジライト型バックライトユニット及びラップトップコンピュータ
WO2014103385A1 (fr) * 2012-12-26 2014-07-03 株式会社 東芝 Appareil d'affichage et unité d'affichage
US10488582B2 (en) 2016-06-24 2019-11-26 Minebea Mitsumi Inc. Planar illumination apparatus
EP4023932A4 (fr) * 2019-08-27 2022-07-06 Mitsubishi Electric Corporation Dispositif d'éclairage

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WO2013161934A1 (fr) * 2012-04-27 2013-10-31 株式会社ニコン Unité de source de lumière et dispositif électronique
JP2014010920A (ja) * 2012-06-27 2014-01-20 Sharp Corp 光源モジュール、及び、液晶表示装置
JP6296902B2 (ja) * 2014-05-29 2018-03-20 株式会社沖データ 半導体装置、半導体装置を用いた画像形成装置及び画像読み取り装置
KR102333790B1 (ko) 2015-01-23 2021-12-01 삼성디스플레이 주식회사 곡면표시장치
JP6523360B2 (ja) * 2016-06-24 2019-05-29 ミネベアミツミ株式会社 面状照明装置

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WO2012132485A1 (fr) * 2011-03-28 2012-10-04 富士フイルム株式会社 Dispositif d'éclairage plan
WO2012132510A1 (fr) * 2011-03-28 2012-10-04 富士フイルム株式会社 Dispositif d'éclairage plan
JP2012204267A (ja) * 2011-03-28 2012-10-22 Fujifilm Corp 面状照明装置
JP2012204323A (ja) * 2011-03-28 2012-10-22 Fujifilm Corp 面状照明装置
WO2012153615A1 (fr) * 2011-05-10 2012-11-15 富士フイルム株式会社 Dispositif d'éclairage de forme plane
JP2013089430A (ja) * 2011-10-18 2013-05-13 Kowa Co 照明装置
JP2014071378A (ja) * 2012-09-28 2014-04-21 Keiwa Inc 導光シート、エッジライト型バックライトユニット及びラップトップコンピュータ
WO2014103385A1 (fr) * 2012-12-26 2014-07-03 株式会社 東芝 Appareil d'affichage et unité d'affichage
US10488582B2 (en) 2016-06-24 2019-11-26 Minebea Mitsumi Inc. Planar illumination apparatus
EP4023932A4 (fr) * 2019-08-27 2022-07-06 Mitsubishi Electric Corporation Dispositif d'éclairage
US11828973B2 (en) 2019-08-27 2023-11-28 Mitsubishi Electric Corporation Illumination device

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JP2012069245A (ja) 2012-04-05
KR20120082862A (ko) 2012-07-24

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