WO2016186158A1 - Dispositif d'éclairage et dispositif d'affichage - Google Patents

Dispositif d'éclairage et dispositif d'affichage Download PDF

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Publication number
WO2016186158A1
WO2016186158A1 PCT/JP2016/064843 JP2016064843W WO2016186158A1 WO 2016186158 A1 WO2016186158 A1 WO 2016186158A1 JP 2016064843 W JP2016064843 W JP 2016064843W WO 2016186158 A1 WO2016186158 A1 WO 2016186158A1
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WIPO (PCT)
Prior art keywords
light
wavelength
conversion sheet
wavelength conversion
selection filter
Prior art date
Application number
PCT/JP2016/064843
Other languages
English (en)
Japanese (ja)
Inventor
田中　正太郎
隆一 若原
裕介 塚村
Original Assignee
東レ株式会社
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Application filed by 東レ株式会社 filed Critical 東レ株式会社
Priority to JP2016542784A priority Critical patent/JP6787127B2/ja
Priority to CN201680024009.3A priority patent/CN107533257B/zh
Priority to KR1020177031309A priority patent/KR102538377B1/ko
Publication of WO2016186158A1 publication Critical patent/WO2016186158A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • 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
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • G02F1/133507—Films for enhancing the luminance
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G02F1/133521—Interference filters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides

Definitions

  • the present invention relates to an illumination device used for, for example, a liquid crystal display and a display device using the same.
  • a lighting device used for a liquid crystal display or the like is a lighting device for expressing a high-efficiency and pure color.
  • a light emitting element such as a blue LED or a blue laser is used as a light source, and a film containing quantum dots or phosphors is further used.
  • An illuminating device that performs color adjustment using it is used (Patent Document 1).
  • blue light is emitted from a light emitting element such as a blue LED or a blue laser toward a film containing quantum dots and phosphors, and the emitted blue light is converted into green light and red light with quantum dots and phosphors. Change the color. Then, the blue light of the light emitting element is combined with the green light and the red light that are color-converted with the quantum dots and the phosphor to obtain white light.
  • a light emitting element such as a blue LED or a blue laser toward a film containing quantum dots and phosphors
  • the emitted blue light is converted into green light and red light with quantum dots and phosphors. Change the color.
  • the blue light of the light emitting element is combined with the green light and the red light that are color-converted with the quantum dots and the phosphor to obtain white light.
  • the central portion of the illumination device In the illumination device used for the liquid crystal display as described above, that is, the illumination device that obtains white light using a light emitting element such as a blue LED or a blue laser, and a film containing quantum dots or phosphors, the central portion of the illumination device
  • the color near the edge of the lighting device (display color near the edge of the screen in the case of a liquid crystal display) is lighter than the color near it (display color near the center of the screen if it is a liquid crystal display)
  • the influence of the luminescent color of the light becomes strong (if the light emitting element is a blue LED or a blue laser, the color becomes bluish).
  • An object of the present invention is to improve the problem that the color near the center of the lighting device is different from the color near the end, and to provide a lighting device with little color unevenness and a display device using the same.
  • a light wavelength conversion sheet [1] a light wavelength conversion sheet; An optical wavelength selection filter; A light emitting element; A lighting device comprising: A light emitting element, a light wavelength conversion sheet, and a light wavelength selection filter are provided in this order, The area of the light wavelength selection filter is smaller than the area of the light wavelength conversion sheet, The illuminating device, wherein the light emitting element is separated from the light wavelength conversion sheet.
  • a light wavelength conversion sheet comprising: A light emitting element, an optical wavelength selection filter, and an optical wavelength conversion sheet are provided in this order.
  • the area of the light wavelength selection filter is smaller than the area of the light wavelength conversion sheet, The illuminating device, wherein the light emitting element is separated from the light wavelength conversion sheet.
  • a first light wavelength conversion sheet; A second light wavelength conversion sheet; A light emitting element; A lighting device comprising: The first light wavelength conversion sheet, the light emitting element, and the second light wavelength conversion sheet are provided in this order, The area of the first light wavelength conversion sheet is smaller than the area of the second light wavelength conversion sheet, The illuminating device, wherein the light emitting element is provided apart from the second light wavelength conversion sheet.
  • ⁇ 1 Light emission wavelength of light emitting element (nm)
  • ⁇ 2 wavelength at which the transmittance of the optical wavelength selection filter becomes 70%
  • ⁇ 3 wavelength (nm) at which the transmittance of the optical wavelength selection filter is 30%.
  • the illumination device according to [3], further comprising a light guide plate disposed in an optical path from the light emitting element to the second light wavelength conversion sheet for light emitted from the light emitting element.
  • a brightness enhancement film is further included, and the brightness enhancement film is provided on the emission side of any member of the light emitting element, the light wavelength sheet, and the light wavelength selection filter.
  • the illumination device according to any one of [3].
  • the angle between the direction in which the transmittance at the wavelength ⁇ 3 of the optical wavelength selection filter is maximized and the direction in which the transmittance at the wavelength ⁇ 3 of the brightness enhancement film is maximized is 10 ° or less.
  • the angle between the direction in which the transmittance at the wavelength ⁇ 3 of the optical wavelength selection filter is maximized and the direction in which the transmittance at the wavelength ⁇ 3 of the brightness enhancement film is maximized is 80 ° or more.
  • a specular reflective film is further included, and the specular reflective film is provided on the opposite side of the light-emitting element, light wavelength sheet, and light wavelength selection filter from the emission side.
  • the illumination device according to any one of [1] to [3].
  • a display device comprising a display panel and a lighting device provided adjacent to the display panel, The lighting device is [1] A display device comprising the illumination device according to any one of [14].
  • an illumination device with little color unevenness can be obtained, and if it is used for a display device, a display device with excellent display performance with little color unevenness can be obtained.
  • FIG. 1A is a schematic cross-sectional view of an example of the illumination device of the present invention
  • FIG. 1B is a schematic plan view of a substrate, an LED, and a reflector.
  • FIG. 2 is a schematic cross-sectional view when a liquid crystal display is used as a display device, for example.
  • the liquid crystal display include, but are not limited to, a TV, a monitor, a notebook personal computer, a tablet portable terminal, and a smartphone.
  • the lighting device can be used for display devices such as signboards and vending machines, and can also be suitably used as various lighting devices such as household lighting devices and facility lighting devices. It is not limited to these.
  • As the optical film of FIGS. 1 and 2 a diffusion film, a prism film, a retroreflective film, or the like is used.
  • the light wavelength conversion sheet is a sheet that converts light of a specific wavelength into light of another wavelength.
  • a light wavelength conversion sheet that converts light having a specific wavelength (light having a first wavelength) into light having another wavelength (light having a second wavelength) is preferably used.
  • converting light of a specific wavelength into light of another wavelength means that light having a peak at a specific wavelength (light of the first wavelength) has light at a wavelength other than the specific wavelength (first 2).
  • the light having the second wavelength may be light having a peak at one wavelength, or light having a peak at each of the two wavelengths. That is, the light of the first wavelength is converted by the light wavelength conversion sheet into light of the second wavelength having a peak at one wavelength (second wavelength) different from the peak wavelength of the light of the first wavelength.
  • the light may be converted into two lights, light having a peak at the second wavelength ⁇ and light having a peak at the second wavelength ⁇ .
  • the light of the first wavelength is preferably light having a wavelength having a peak at 200 nm to less than 380 nm (near ultraviolet) and / or light having a wavelength having a peak at 380 nm to less than 495 nm (blue). More preferably, it is light having a wavelength having a peak at 220 nm or more and 350 nm or less and / or light having a wavelength having a peak at 400 nm or more and 470 nm or less, more preferably light having a wavelength having a peak at 240 nm or more and 320 nm or less and / or 410 nm or more. It is light having a wavelength having a peak at 460 nm or less.
  • Examples of light emitting elements that emit light of these wavelengths include near ultraviolet LEDs and blue LEDs.
  • light having the second wavelength light having a wavelength having a peak at 495 nm to less than 570 nm (green), light having a wavelength having a peak at 570 nm to less than 590 nm (yellow), and a peak having a peak at 590 nm to 750 nm (red) It is preferable that the light is at least one wavelength selected from the group consisting of light having a wavelength.
  • the optical wavelength selection filter is a filter that transmits or reflects light of a specific wavelength.
  • the area of the light wavelength selection filter is preferably smaller than the area of the light wavelength conversion sheet. If the area of the light wavelength selection filter is made smaller than the area of the light wavelength conversion sheet and is partially disposed in the illumination device, it is preferable because the color of the emitted light of the illumination device can be partially adjusted.
  • a light-emitting element refers to a semiconductor element that emits light.
  • the light emitting element may be provided in any way in the lighting device.
  • a plurality of light emitting elements are provided corresponding to the entire surface of the light wavelength conversion sheet from the viewpoint of efficiently emitting light.
  • a plurality of light guide plates are provided along the end of the light guide plate from the viewpoint of light emission efficiency.
  • FIG. 3 is a schematic diagram in the first embodiment of the illumination device of the present invention.
  • a light wavelength conversion sheet 31 and a light wavelength selection filter 32 are provided, and a blue LED 33 is provided on the substrate 34 as a light emitting element.
  • a reflecting plate 37 and a diffusing plate 38 are provided to reflect and diffuse light from the light emitting element.
  • Blue LED 33, light wavelength conversion sheet 31, and light wavelength selection filter 32 are provided in this order.
  • the blue LED 33 is provided apart from the light wavelength conversion sheet 31 and emits light toward the light wavelength conversion sheet 31.
  • the area of the light wavelength selection filter 32 is preferably smaller than the area of the light wavelength conversion sheet 31. If the area of the light wavelength selection filter 32 is made smaller than the area of the light wavelength conversion sheet 31 and is partially disposed in the illumination device, it is preferable because the color of the emitted light of the illumination device can be partially adjusted efficiently.
  • the optical wavelength selection filter 32 reflects the first wavelength light emitted from the blue LED 33, and the second wavelength generated by the light wavelength conversion sheet 31 converting the first wavelength light. It transmits light of a wavelength.
  • the light wavelength selection filter 32 in the first embodiment has a peak wavelength (hereinafter sometimes referred to as a peak wavelength of the second wavelength) for the light of the second wavelength converted by the light wavelength conversion sheet 31.
  • a peak wavelength of the second wavelength for the light of the second wavelength converted by the light wavelength conversion sheet 31.
  • the filter has a transmittance of 85% or more at the peak wavelength of the second wavelength and a reflectance of 20% or more at the peak wavelength of the first wavelength.
  • it when there are two or more light beams having the second wavelength, it means a filter having a transmittance of 85% or more for all the light beams having the second wavelength.
  • the light of the first wavelength is light having a peak at a specific wavelength
  • the light of the second wavelength is light having a peak at a wavelength different from the light of the first wavelength
  • FIG. 4 is an example of the first wavelength and the second wavelength.
  • the light emitting element is a blue LED
  • the light wavelength conversion sheet converts the blue light of the blue wavelength, which is the first wavelength emitted from the blue LED, to the green that is the second wavelength.
  • Two types of quantum dots are included: a green quantum dot that emits green light of a wavelength, and a red quantum dot that emits red light that is red wavelength, which is the second wavelength, by converting blue light.
  • the blue LED has a blue light peak of 450 nm, a green light peak of 550 nm, and a red light peak of 610 nm. By combining these lights, white light can be obtained.
  • 5 and 6 are diagrams showing optical paths when there is no optical wavelength selection filter 32 and when there is no optical wavelength selection filter 32, respectively.
  • the light wavelength selection filter 32 transmits green light and red light converted by the light wavelength conversion sheet, and reflects a part or all of the blue light emitted by the blue LED.
  • reflecting part of the blue light emitted by the blue LED means that the reflectance at the peak wavelength of the blue light emitted by the blue LED is 20% or more, and the blue light emitted by the blue LED is emitted.
  • the reflection of all of the above means that the reflectance at the peak wavelength of the blue light emitted by the blue LED is 100% or more.
  • the bluishness of the light emitted to the emission surface side of the light wavelength selection filter 32 is reduced as compared with the light emitted to the emission surface side in the case of FIG. 5, that is, when there is no light wavelength selection filter 32.
  • the light wavelength selection filter 32 is partially disposed in a portion with strong bluishness (a portion where the influence of the light emission color of the light emitting element is strong) such as near the end of the lighting device, so that the color unevenness of the lighting device can be obtained. Can be improved.
  • the blue light reflected by the light wavelength selection filter 32 is reused in the lighting device by being reflected by a reflector or the like, so that there is little light loss. Accordingly, color adjustment can be performed with less light loss compared to other color adjustment methods that reduce blueness by the principle of absorbing blue light.
  • the optical wavelength selection filter 32 preferably has a reflectance of 20% or more at the peak wavelength of the first wavelength.
  • the reflectance at the peak wavelength of the first wavelength is more preferably 25 to 90%. More preferably 30 to 80%.
  • the light wavelength selection filter 32 preferably has a transmittance of the peak wavelength of the second wavelength of 85% or more, more preferably 87% or more, and further preferably 90% or more.
  • the light wavelength selection filter 32 may be laminated on the light wavelength conversion sheet 31, for example, as shown in FIG.
  • the optical wavelength selection filter 32 satisfies the following formula (1).
  • the following formula (1) indicates that the change in transmittance between the wavelength band that reflects light and the wavelength band that transmits light is steep, and as
  • ⁇ 1 Light emission wavelength of light emitting element (nm)
  • ⁇ 2 wavelength at which the transmittance of the optical wavelength selection filter becomes 70%
  • ⁇ 3 wavelength (nm) at which the transmittance of the optical wavelength selection filter is 30%.
  • the optical wavelength selection filter is preferably a laminate of two types of films having different refractive indexes that are transparent in the visible light region.
  • the optical wavelength selection filter is preferably a laminate of two types of films having different refractive indexes that are transparent in the visible light region.
  • the two types of films may be organic resin materials or inorganic materials, and the organic resin may be either a thermoplastic resin or a curable resin. Further, it may be a homo resin, a copolymer resin or a blend of two or more kinds of resins. More preferably, it is a thermoplastic resin because of good moldability.
  • various additives such as antioxidants, antistatic agents, crystal nucleating agents, inorganic particles, organic particles, viscosity reducers, thermal stabilizers, lubricants, infrared absorbers, ultraviolet absorbers, A dopant for adjusting the refractive index may be added.
  • a fluorescent whitening agent is included in the light wavelength selection filter.
  • the fluorescent whitening agent is one that emits blue light when excited by light having a wavelength shorter than the emission wavelength of the blue LED.
  • the fluorescent whitening agent is emitted from the LED by including the fluorescent whitening agent. Light of a short wavelength that cannot be converted can be converted into blue light that can be converted into green light or red light by a light wavelength conversion sheet, and brightness can be improved when the lighting device is formed.
  • thermoplastic resins examples include polyolefin resins such as polyethylene, polypropylene, polystyrene and polymethylpentene, alicyclic polyolefin resins, polyamide resins such as nylon 6 and nylon 66, aramid resins, polyethylene terephthalate, polybutylene terephthalate and polypropylene terephthalate.
  • Polyester resin such as polybutyl succinate, polyethylene-2,6-naphthalate, polycarbonate resin, polyarylate resin, polyacetal resin, polyphenylene sulfide resin, tetrafluoroethylene resin, trifluorinated ethylene resin, trifluorinated ethylene chloride resin
  • Fluorine resin such as ethylene tetrafluoride-6-propylene copolymer, vinylidene fluoride resin, acrylic resin such as PMMA, methacrylic resin, poly Acetal resin, polyglycolic acid resin, polylactic acid resin, acrylonitrile-butadiene-styrene copolymer, acrylonitrile-ethylene - propylene rubber, or the like can be used styrene copolymer.
  • a polyester resin is particularly preferable from the viewpoint of strength, heat resistance, and transparency.
  • polyester resins polyethylene terephthalate and copolymers thereof, polyethylene naphthalate and copolymers thereof, polybutylene terephthalate and copolymers thereof, polybutylene naphthalate and copolymers thereof, and polyhexamethylene terephthalate and copolymers thereof. It is preferable to use a polymer, polyhexamethylene naphthalate, and a copolymer thereof.
  • an optical wavelength selective filter that satisfies the above formula (1)
  • the number of layers tends to increase, by controlling the thickness of a large number of layers, it becomes easy to sharpen the change from the wavelength band, in particular from the reflected wavelength band to the transmitted wavelength band.
  • the shape of the optical wavelength selection filter may be a planar shape, a shape having a large number of holes in the surface, a mesh shape, a circle, an ellipse, a shape surrounded by other curves, a triangle, a rectangle, other Various shapes such as a polygon may be used.
  • the optical wavelength selection filter in which two kinds of films having different refractive indexes as described above are stacked can be used by stacking on another sheet.
  • the shape of the optical wavelength selection filter when laminating to another sheet may be a planar shape, a shape having a large number of holes on the surface, a mesh shape, or a layered state such as a dot shape.
  • Various shapes such as a circle, an ellipse, a shape surrounded by other curves, a triangle, a quadrangle, and other polygons may be used.
  • the surface of the light wavelength selection filter and / or the light wavelength conversion sheet has an uneven shape. Having an uneven shape here means that Rz in JIS B0601 (2001) is 1 ⁇ m or more when the surface roughness of the light wavelength selection filter and / or the light wavelength conversion sheet is measured. More preferably, Rz is 10 ⁇ m or more, and the following effects can be easily obtained.
  • the first effect of the surface of the light wavelength selection filter and / or the light wavelength conversion sheet having an uneven shape is easy slipping. Since the surface has a concavo-convex shape, the slipperiness is expressed, so that it is possible to suppress the occurrence of scratches when the light wavelength selection filter and / or the light wavelength conversion sheet is incorporated into the lighting device.
  • the second effect is light extraction.
  • the inventors of the present invention have found a phenomenon that in the light wavelength conversion sheet, a phenomenon that light is reflected in the light wavelength conversion sheet causes a phenomenon that the light is confined in the sheet like an optical fiber and the luminance is lowered.
  • the surface of the light wavelength selection filter and / or the light wavelength conversion sheet has a concavo-convex shape, light is extracted from the concavo-convex interface, thereby reducing the light taken into the light wavelength conversion sheet and improving the brightness. The effect of is obtained.
  • the third effect is the adjustment of the optical path of light.
  • the light from the light emitting element particularly the light emitting diode, travels with a relatively high directivity to the display side, whereas the light from the light wavelength conversion sheet emits isotropically. It will cause a drop.
  • the surface of the light wavelength selection filter and / or the light wavelength conversion sheet has a concavo-convex shape, it is easy to adjust the direction of light at the concavo-convex interface, and in particular, to improve brightness by condensing in the front direction.
  • other optical members can be omitted when forming the lighting device and the display device, which contributes to cost reduction.
  • the uneven shape is preferably a microlens shape, a prism shape, a substantially triangular shape, or a substantially semicircular shape.
  • the microlens shape indicates a substantially hemispherical unevenness
  • the prism shape indicates a substantially triangular unevenness.
  • a light-emitting element is a semiconductor element that emits light, and any suitable light-emitting element such as an LED or a laser having a blue or near-ultraviolet wavelength can be used as the light-emitting element.
  • the light wavelength conversion sheet is a sheet that converts light of a specific wavelength into light of another wavelength as described above.
  • the light wavelength conversion sheet is a sheet containing quantum dots or phosphors having a function of converting a light wavelength.
  • a resin sheet containing quantum dots or phosphors may be used, or a film containing quantum dots or phosphors may be laminated on a sheet serving as a substrate.
  • the area of the light wavelength selection filter is the area of the film containing quantum dots or phosphors. It is preferable to make it smaller. If the area of the light wavelength selection filter is made smaller than the area of the film containing quantum dots and phosphors and is partially disposed in the illumination device, the color of the emitted light of the illumination device can be partially adjusted efficiently. Therefore, it is preferable.
  • a blue LED blue light having a blue wavelength, which is the first wavelength emitted from the blue LED, is converted to the second light.
  • red quantum dots that emit light of a red wavelength that is a second wavelength by converting light of a near-ultraviolet wavelength that is the first wavelength emitted from the near-ultraviolet LED; Green quantum dots that emit green light having a green wavelength, which is a second wavelength by converting light having a near ultraviolet wavelength, and blue light having a blue wavelength, which is a second wavelength, by converting light having a near ultraviolet wavelength You may use what contains the quantum dot for blue to light-emit.
  • quantum dots examples include CdSe having a ZnS shell.
  • a core / shell luminescent nanocrystal containing CdSe / ZnS, InP / ZnS, PbSe / PbS, CdSe / CdS, CdTe / CdS, or CdTe / ZnS may be used.
  • Examples of the phosphor include SrGa 2 S 4 : Eu 2+ as a green phosphor and (Ca, Sr, Ba) S: Eu 2+ as a red phosphor.
  • SrGa 2 S 4 Eu 2+ as a green phosphor
  • Ca, Sr, Ba Ce 2+ as a red phosphor.
  • white light is obtained in the present embodiment, it is possible to appropriately select the type of light emitting element or phosphor in order to obtain light of a desired color as light emitted from the illumination device.
  • an optical sheet is provided on the light exit side of the optical wavelength selection filter, as in FIGS. It is preferable to be provided.
  • Prism sheets, microlenses, and polarizing / reflecting films have traditionally been beneficially used to improve frontal brightness, but when used in combination with a light wavelength conversion sheet, the light once transmitted through the light wavelength conversion sheet is used. It can be reflected on the optical film and reflected / re-wavelength converted to the light wavelength conversion sheet side, and the cost can be reduced by reducing the amount of expensive quantum dots used.
  • the angle between the direction in which the transmittance at the wavelength ⁇ 3 of the optical wavelength selection filter is maximized and the direction in which the transmittance at the wavelength ⁇ 3 of the brightness enhancement film is maximized is arranged to be 80 ° or more.
  • the direction in which the transmittance is maximum is a direction in which polarized light having a wavelength ⁇ 3 is incident perpendicularly to the film surface and the polarization surface is rotated by 5 ° to maximize the transmittance.
  • the direction in which the transmittance of the light wavelength selection filter and the brightness enhancement film becomes maximum is orthogonal, the polarization that could not be reflected by the light wavelength selection filter can be efficiently reflected by the brightness enhancement film. It is possible to further improve the effect.
  • the reflection plate 37 a light diffusive reflection film such as a white film may be used, but a regular reflection film is more preferable.
  • the specular reflectivity means that the glossiness measured at an incident angle of 60 ° and an outgoing angle of 60 ° is 100 or more as per JIS Z8741 (1997).
  • FIG. 8 is a schematic diagram of the lighting apparatus according to the second embodiment of the present invention.
  • a light wavelength conversion sheet 81 and a light wavelength selection filter 82 are provided, and a blue LED 83 is provided as a light emitting element at an end of the light guide plate 85.
  • Blue LED 83, light wavelength conversion sheet 81, and light wavelength selection filter 82 are provided in this order.
  • Blue LED 83 is provided apart from light wavelength conversion sheet 81.
  • the light of the blue LED 83 enters from the end of the light guide plate 85 and is emitted while being guided by the light guide plate. Based on this principle, light is emitted toward the light wavelength conversion sheet 81.
  • the area of the light wavelength selection filter 82 is preferably smaller than the area of the light wavelength conversion sheet 81. If the area of the light wavelength selection filter 82 is made smaller than the area of the light wavelength conversion sheet 81 and is partially disposed in the illumination device, it is preferable because the color of the emitted light from the illumination device can be partially adjusted efficiently.
  • FIG. 9 is a schematic diagram in the third embodiment of the illumination device of the present invention.
  • a light wavelength conversion sheet 91 and a light wavelength selection filter 92 are provided, and a blue LED 93 is provided on the substrate 94 as a light emitting element. Further, a reflecting plate 97 and a diffusing plate 98 are provided in order to reflect and diffuse light from the light emitting element.
  • Blue LED 93, light wavelength selection filter 92, and light wavelength conversion sheet 91 are provided in this order.
  • the blue LED 93 is spaced apart from the light wavelength conversion sheet 91 and emits light toward the light wavelength conversion sheet 91.
  • the area of the light wavelength selection filter 92 is preferably smaller than the area of the light wavelength conversion sheet 91. If the area of the light wavelength selection filter 92 is made smaller than the area of the light wavelength conversion sheet 91 and is partially disposed in the illumination device, it is preferable because the color of the emitted light from the illumination device can be partially adjusted efficiently.
  • the light wavelength selection filter 92 transmits the first wavelength light emitted from the blue LED 93, and the second wavelength generated by the light wavelength conversion sheet 91 converting the first wavelength light. It reflects light of a wavelength.
  • the optical wavelength selection filter 92 transmits 85% or more of the peak wavelength of light emitted from the blue LED 93 (hereinafter sometimes referred to as the peak wavelength of the first wavelength). And a filter that reflects 20% or more of light having a peak wavelength (hereinafter sometimes referred to as a peak wavelength of the second wavelength) with respect to the light having the second wavelength generated by being converted by the light wavelength conversion sheet 91. That means. That is, the filter has a transmittance of 85% or more at the peak wavelength of the first wavelength and a reflectance of 20% or more at the peak wavelength of the second wavelength. In addition, when there are two or more light beams having the second wavelength, it means a filter having a reflectance of 20% or more for all the light beams having the second wavelength.
  • FIGS. 10 and 11 are diagrams showing optical paths when there is no optical wavelength selection filter 92 and when there is no optical wavelength selection filter 92, respectively.
  • the light emitted to the opposite side of the emission surface among the green light and red light emitted from the light wavelength conversion sheet diffuses in the illumination device. To do.
  • the light wavelength selection filter 92 transmits the blue light emitted from the blue LED, and is emitted to the opposite side of the emission surface side among the green light and red light emitted from the light wavelength conversion sheet. A part or all of the light is reflected, and the green light and the red light are emitted to the vicinity of the light exit surface provided with the light wavelength selection filter. Therefore, the bluishness of the light emitted toward the emission surface in the vicinity of the light wavelength selection filter 92 is reduced as compared with the light emitted toward the emission surface in the case of FIG. 10, that is, when there is no light wavelength selection filter 92.
  • the light wavelength selection filter 92 transmits the blue light emitted from the blue LED, and is emitted to the opposite side of the emission surface side among the green light and red light emitted from the light wavelength conversion sheet. A part or all of the light is reflected, and the green light and the red light are emitted to the vicinity of the light exit surface provided with the light wavelength selection filter. Therefore, the bluishness of
  • the light wavelength selection filter 92 is partially disposed in a portion with a strong bluish color (a portion where the influence of the light emission color of the light emitting element is strong) such as near the end of the lighting device, so that the color unevenness of the lighting device can be obtained. Can be improved.
  • color adjustment can be performed with less light loss compared to other color adjustment methods that reduce blueness by the principle of absorbing blue light.
  • the light wavelength selection filter 92 preferably has a transmittance at the peak wavelength of the first wavelength of 85% or more, more preferably 87% or more, and further preferably 90% or more.
  • the optical wavelength selection filter 92 preferably has a reflectance at the peak wavelength of the second wavelength of 20% or more, more preferably 30% or more, further preferably 70% or more, and 90% or more. It is particularly preferred that
  • the optical wavelength selection filter 92 satisfies the following formula (1).
  • the following formula (1) indicates that the change in transmittance between the wavelength band that reflects light and the wavelength band that transmits light is steep, and as
  • blue light is converted by the light wavelength conversion sheet from the wavelength band that transmits from the reflected wavelength band, that is, the wavelength band that transmits the blue light emitted by the blue LED in the third embodiment.
  • the wavelength band that reflects green light of the green wavelength that is the emission wavelength it is possible to reflect green light and red light while selectively and efficiently transmitting only blue light, This makes it easier to obtain the effect of the optical wavelength selection filter to the maximum extent.
  • ⁇ 1 Light emission wavelength of light emitting element (nm)
  • ⁇ 2 wavelength at which the transmittance of the optical wavelength selection filter becomes 70%
  • ⁇ 3 wavelength (nm) at which the transmittance of the optical wavelength selection filter is 30%.
  • the light wavelength selection filter 92 may be laminated on a light wavelength conversion sheet 91 as shown in FIG.
  • an optical sheet is provided on the light exit side of the optical wavelength selection filter as in FIGS. 1 and 2, but in particular, a brightness enhancement film such as a prism sheet, a microlens sheet, or a polarizing reflection film is used.
  • a brightness enhancement film such as a prism sheet, a microlens sheet, or a polarizing reflection film is used.
  • the angle between the direction in which the transmittance at the wavelength ⁇ 3 of the optical wavelength selection filter is maximized and the direction in which the transmittance at the wavelength ⁇ 3 of the brightness enhancement film is maximized is 10 ° or less.
  • the light wavelength selection filter and the brightness enhancement film are parallel to each other in the direction in which the transmittance is maximum, so that the light reflected from the brightness enhancement film to the light wavelength conversion sheet and the light wavelength selection filter can be efficiently reflected. It is possible to suppress the reflection and reflection to the light emitting element, and the effect of suppressing the color unevenness of the lighting device can be obtained.
  • FIG. 13 is a schematic diagram of the illumination device according to the fourth embodiment of the present invention.
  • a light wavelength conversion sheet 131 and a light wavelength selection filter 132 are provided, and a blue LED 133 is provided as a light emitting element at an end of the light guide plate 135.
  • Blue LED 133 light wavelength selection filter 132, and light wavelength conversion sheet 131 are provided in this order.
  • the blue LED 133 is provided apart from the light wavelength conversion sheet 131.
  • the light of the blue LED 133 enters from the end of the light guide plate 135 and is emitted while being guided by the light guide plate. Based on this principle, light is emitted toward the light wavelength conversion sheet 131.
  • the area of the light wavelength selection filter 132 is preferably smaller than the area of the light wavelength conversion sheet 131. If the area of the light wavelength selection filter 132 is made smaller than the area of the light wavelength conversion sheet 131 and is partially disposed in the illumination device, it is preferable because the color of the emitted light from the illumination device can be partially adjusted efficiently.
  • FIG. 14 is a schematic diagram in the fifth embodiment of the illumination device of the present invention.
  • a first light wavelength conversion sheet 146 and a second light wavelength conversion sheet 141 are provided, and a blue LED 143 is provided on the substrate 144 as a light emitting element.
  • a reflection plate 147 and a diffusion plate 148 are provided to reflect and diffuse light from the light emitting element.
  • the first light wavelength conversion sheet 146, the blue LED 143, and the second light wavelength conversion sheet 141 are provided in this order.
  • the blue LED 143 is provided apart from the second light wavelength conversion sheet 141 and emits light toward the second light wavelength conversion sheet 141.
  • the area of the first light wavelength conversion sheet 146 is preferably smaller than the area of the second light wavelength conversion sheet 141. If the area of the first light wavelength conversion sheet 146 is made smaller than the area of the second light wavelength conversion sheet 141 and is partially disposed in the lighting device, the color of the emitted light of the lighting device is partially adjusted efficiently. This is preferable because it is possible.
  • FIGS. 15 and 16 are diagrams showing optical paths when there is no first optical wavelength selection filter 146 and when there is no first optical wavelength selection filter 146, respectively.
  • a part of the blue light emitted from the blue LED toward the second light wavelength conversion sheet 141 is reflected by the surface of the diffusion plate 148 and emitted to the side opposite to the emission surface side.
  • a part is reflected also on the surface of another optical sheet and the surface of the 2nd light wavelength conversion sheet, and it radiate
  • the light emitted to the opposite side to the emission surface side is reflected by the reflecting plate and directed to the emission surface side, and a part of the light is reflected again by the surface of the diffusion plate 148 and the like and emitted to the opposite side to the emission surface side. Repeat that.
  • the blue light emitted to the side opposite to the emission surface side peaks at a wavelength different from the peak wavelength of the blue wavelength, such as green light and red light. Then, the light is output to the output surface side by the reflector.
  • the blue light emitted to the side opposite to the emission surface side is emitted to the emission surface side by the reflector without being wavelength-converted. Therefore, when there is the first light wavelength conversion sheet 146, the bluishness of the light emitted toward the emission surface in the vicinity of the first light wavelength conversion sheet 146 is the case of FIG. 15, that is, the first light wavelength conversion sheet 146 is When there is no light, it is reduced compared to the light emitted to the emission surface side.
  • the light wavelength conversion sheet 146 is partially disposed in a portion with strong bluishness (a portion where the influence of the light emission color of the light emitting element is strong) such as near the end of the lighting device, so that the color unevenness of the lighting device can be obtained. Can be improved.
  • color adjustment can be performed with less light loss compared to other color adjustment methods that reduce blueness by the principle of absorbing blue light.
  • the first light wavelength conversion sheet 146 may be laminated on a reflector as shown in FIG.
  • the first light wavelength conversion sheet 146 may contain a quantum dot or a phosphor in a reflection plate.
  • a sheet containing quantum dots or phosphors in a reflector plate has a wavelength conversion function and a reflection function.
  • the shape of the first light wavelength conversion sheet may be a planar shape, a shape having a large number of holes in the surface, a mesh shape, a circle, an ellipse, a shape surrounded by other curves, a triangle, a quadrangle, Various shapes such as other polygons may be used.
  • the first light wavelength conversion sheet is a sheet that converts light of a specific wavelength into light of another wavelength as described above, and contains, for example, quantum dots and phosphors having a function of converting light wavelength. It is a sheet.
  • a resin sheet containing quantum dots or phosphors may be used, or a film containing quantum dots or phosphors may be laminated on a sheet serving as a substrate.
  • the shape of the film containing quantum dots and phosphors to be laminated on the base sheet may be a shape with a large number of holes on the surface, a mesh shape, or a layered state such as a dot shape.
  • Various shapes such as a circle, an ellipse, a shape surrounded by other curves, a triangle, a quadrangle, and other polygons may be used.
  • the area of the film containing the quantum dot or phosphor of the first light wavelength conversion sheet is: It is preferable to make it smaller than the area of the film
  • the area of the film containing the quantum dots and the phosphor of the first light wavelength conversion sheet is made smaller than the area of the film containing the quantum dots and the phosphor of the second light wavelength conversion sheet and partially arranged in the lighting device. This is preferable because the color of the light emitted from the illumination device can be partially adjusted efficiently.
  • FIG. 18 is a schematic diagram of the sixth embodiment of the illumination device of the present invention.
  • a first light wavelength conversion sheet 186 and a second light wavelength conversion sheet 181 are provided, and a blue LED 183 is provided as a light emitting element at an end of the light guide plate 185.
  • the first light wavelength conversion sheet 186, the blue LED 183, and the second light wavelength conversion sheet 181 are provided in this order.
  • the blue LED 183 is provided apart from the second light wavelength conversion sheet 181.
  • the light of the blue LED 183 enters from the end of the light guide plate 185 and is emitted while being guided by the light guide plate. Based on this principle, light is emitted toward the second light wavelength conversion sheet 181.
  • the area of the first light wavelength conversion sheet 186 is preferably smaller than the area of the second light wavelength conversion sheet 181. If the area of the first light wavelength conversion sheet 186 is made smaller than the area of the second light wavelength conversion sheet 181 and is partially disposed in the lighting device, the color of the emitted light of the lighting device is partially adjusted efficiently. This is preferable because it is possible.
  • the attached Grandeira polarizer is installed, the sample is fixed in a certain direction, and the transmittance is measured by rotating the polarizer by 5 °. The angle at which was the maximum was measured.
  • Color coordinates / luminance of illumination device The illumination device A is configured as described in Examples 1 to 10, and the color coordinates (x value, y value) at the center thereof are set as follows using the following spectral radiance meter. The measurement was performed in a dark room under the conditions. In determining the central portion, the central portion of the prism film (155 mm ⁇ 98 mm) installed on the uppermost surface of the lighting device A was defined as the central portion. The distance between the spectral radiance meter used in the illumination device and the display was 500 mm.
  • Spectral radiance meter CS-1000A Konica Minolta Sensing Co., Ltd.
  • Objective lens Macro objective lens
  • Lighting device used for evaluation A Kindle Fire HDX 7 backlight was used as the illumination device A in which the light source is a blue LED and the light wavelength conversion sheet is mounted.
  • the size of the light wavelength conversion sheet was 158 mm ⁇ 98 mm.
  • the light wavelength conversion sheet mounted on the lighting device A was used as the second light wavelength conversion sheet.
  • FIG. 19 is a simplified diagram of the lighting device A.
  • the configuration was a blue LED 193, a light guide plate 195, a reflective film 197 having a gloss level of 930 (excluding Example 6), a light wavelength conversion sheet 191, and a prism sheet 199 (two sheets).
  • the blue wavelength of the blue light emitted from the blue LED has a peak at 450 nm
  • the green wavelength of the green light converted by the light wavelength conversion sheet and the red wavelength of the red light are There were peaks at 550 nm and 610 nm, respectively.
  • optical wavelength selection filter A was obtained by the method shown below.
  • polyester A polyethylene terephthalate having an intrinsic viscosity of 0.8 was used.
  • polyester B a blend chip in which 62% by mass of a copolymerized polyester obtained by copolymerizing 30 mol% of cyclohexanedimethanol and 38% by mass of polyethylene terephthalate was used. These polyester A and polyester B were each dried and then fed to an extruder.
  • the combined polyester A and polyester B are supplied to a static mixer, combined in a 501 layer feed block, and alternately laminated in the thickness direction with A / B / A... B / A and 501 layers laminated. did.
  • the laminate composed of the total of 501 layers thus obtained was supplied to a T die and formed into a sheet shape, and then rapidly cooled and solidified on a casting drum maintained at a surface temperature of 25 ° C. while applying electrostatic force.
  • the obtained cast film was heated by a roll group set at 85 ° C. to 100 ° C., stretched 3.3 times in the longitudinal direction, and then the uniaxially stretched film was led to a tenter, preheated with hot air at 100 ° C., and then heated at 110 ° C.
  • the film was stretched 3.8 times in the width direction at temperature.
  • the stretched film was heat-treated with hot air at a relaxation rate of 3% and 150 ° C. in a tenter, gradually cooled to room temperature, and wound up.
  • An optical wavelength selective filter A having a thickness of 40 ⁇ m and a thickness of each layer gradually changing from 43 to 83 nm was obtained.
  • the reflectance at 450 nm was 69%
  • the transmittance at 550 nm was 88%
  • the transmittance at 610 nm was 90%.
  • the light wavelength selection filter A was cut out to 60 mm ⁇ 98 mm and placed between the light wavelength conversion sheet and the prism sheet of the illumination device A.
  • the 60 mm side was arranged in parallel with the long side of the illuminating device, and the central portion of the light wavelength selection filter A was arranged so as to be the central portion of the illuminating device A.
  • the central portion of the prism film (155 mm ⁇ 98 mm) installed in the illumination device A was defined as the central portion.
  • Example 2 Except that the arrangement location of the optical wavelength selection filter A is between the two prism sheets of the illumination device A, the color coordinates (x value, (y value), luminance, and color coordinates (x value, y value) and luminance when not arranged were measured.
  • the evaluation results are shown in Table 1.
  • Example 3 A polarizing reflection film having a degree of polarization of 90% is provided on the prism sheet of Example 1, and the direction in which the transmittance of the light selective wavelength filter A is maximized and the direction in which the transmittance of the polarization reflecting film is maximized are 90 °.
  • the color coordinates (x value, y value) when the optical wavelength selection filter A is arranged, the luminance, and the color coordinates when the optical wavelength selection filter A is not arranged (except for the arrangement so as to be orthogonal to each other) x value, y value) and luminance were measured. The evaluation results are shown in Table 1.
  • the optical wavelength selection filter B was implemented except that polyester B was a copolyester obtained by copolymerizing 25 mol% of spiroglycol and 30 mol% of cyclohexanedicarboxylic acid, the thickness was changed to 70 ⁇ m, and the thickness of each layer was changed stepwise from 76 to 145 nm. In the same manner as in Example 1, an optical wavelength selection filter B was obtained.
  • the transmittance at 450 nm was 90%
  • the reflectance at 550 nm was 34%
  • the reflectance at 610 nm was 90%.
  • the light wavelength selection filter B is used as the light wavelength selection filter, and the light wavelength selection filter B is disposed between the light guide plate and the light wavelength conversion sheet of the illuminating device A in the same manner as in Example 1 except that the light wavelength selection filter B is disposed.
  • the color coordinates (x value, y value) and luminance when the selection filter B was arranged, and the color coordinates (x value, y value) and luminance when the selection filter B was not arranged were measured. The evaluation results are shown in Table 1.
  • Example 5 A polarizing reflection film having a polarization degree of 90% is provided on the prism sheet of Example 4, and the direction in which the transmittance of the light selective wavelength filter B is maximized and the direction in which the transmittance of the polarization reflecting film is maximized are parallel.
  • the color coordinates (x value, y value) and luminance when the optical wavelength selection filter B is arranged, the luminance, and the color coordinates (x value when not arranged) are the same as in Example 4 except that the arrangement is made as follows. , Y value) and luminance.
  • the evaluation results are shown in Table 1.
  • Example 6 Except that the reflective film of Example 4 is a white film having a glossiness of 32, the color coordinates (x value, y value), luminance, and arrangement when the optical wavelength selection filter B is arranged are the same as in Example 4. The color coordinates (x value, y value) and luminance when not performed were measured. The evaluation results are shown in Table 1.
  • the light wavelength selection filter B was coated with the coating agent 1 to form a coating film having a thickness of 5 ⁇ m.
  • Adeka optomer KRM-2199 Adeka optomer KRM-2199 (Asahi Denka Kogyo Co., Ltd.) 10 parts by mass Aron Oxetane OXT-221 (Toagosei Co., Ltd.) 1 part by mass Adeka optomer SP170 (Asahi Denka Kogyo Co., Ltd.) 0.25 Part by mass Pressing a mold in which a plurality of concave grooves whose cross-sectional shape is perpendicular to the longitudinal direction is pressed against the surface coated with the coating agent 1, ultraviolet rays are emitted from the back surface of the coated surface by an ultrahigh pressure mercury lamp at 300 mJ / cm The coating was cured by two irradiations, and the mold was released to obtain a lens shape.
  • the lens shape obtained here had a prism shape with a pitch of 2 ⁇ m and a height of 1 ⁇ m.
  • Example 8 Color coordinates when the optical wavelength selection filter B is arranged in the same manner as in Example 4 except that 0.1% by mass of “OB-1” manufactured by Eastman, which is a fluorescent whitening agent, is added to the polyester B. (X value, y value), luminance, and color coordinates (x value, y value) and luminance when not arranged were measured. The evaluation results are shown in Table 1.
  • a composite film forming apparatus having an extruder B, 100 parts by mass of polyethylene terephthalate pellets are vacuum dried and then supplied to an extruder A heated to 250 ° C. to 300 ° C. to form a polyester layer (first layer).
  • an extruder A heated to 250 ° C. to 300 ° C. to form a polyester layer (first layer).
  • second layer 77.5 parts by mass of a dried polyethylene terephthalate raw material and 20 parts by mass of a dried polymethylpentene resin (hereinafter sometimes abbreviated as PMP) manufactured by Mitsui Chemicals, Inc.
  • PMP dried polymethylpentene resin
  • a polyethylene terephthalate raw material is mixed with 2.5 parts by mass of a master pellet obtained by adding a phosphor to polyethylene terephthalate (“Lumogen” F Yellow 083: 400 ⁇ g / g manufactured by BASF as a phosphor with respect to the total amount of the master pellet). PMP content in the total amount of 100% by mass of 20% by mass, phosphor was adjusted to 0 Pg / g, the polyethylene terephthalate raw material was vacuum dried and fed to an extruder B heated to 250 ⁇ 300 ° C., and introduced into a T-die three-layer composite in the die to melt.
  • Three layers of these polymers were laminated through a three-layer laminating apparatus so as to be A layer (first layer) / B layer (second layer) / A layer (first layer), and formed into a sheet form from a T-die. Further, the unstretched film obtained by cooling and solidifying this sheet-like film with a cooling drum having a surface temperature of 10 ° C. to 40 ° C. is led to a group of rolls heated to 70 to 98 ° C. Then, the film was stretched 3.6 times in the direction perpendicular to the longitudinal direction in an atmosphere heated to 120 ° C. while being guided to a tenter while holding both ends of the longitudinally stretched film with clips. Thereafter, the film was heat-fixed at 180 to 240 ° C. in a tenter to obtain a film having a thickness of 150 ⁇ m.
  • the evaluation results are shown in Table 1.
  • Example 10 Master pellets obtained by adding phosphor to polyethylene terephthalate to 79.75 parts by weight of dried polyethylene terephthalate raw material and 20 parts by weight of dried polymethylpentene resin manufactured by Mitsui Chemicals to form a polyester layer (second layer) (Plum content of 100% by mass of polyethylene terephthalate raw material by mixing 0.25 parts by mass of “Lumogen” F Yellow 083: 400 ⁇ g / g made by BASF as phosphor with respect to the total amount of master pellets) A film was prepared in the same manner as in Example 4 except that the amount was adjusted to 20 mass% and the phosphor was 1 ⁇ g / g, and the first light wavelength conversion sheet B was obtained.
  • second layer Plum content of 100% by mass of polyethylene terephthalate raw material by mixing 0.25 parts by mass of “Lumogen” F Yellow 083: 400 ⁇ g / g made by BASF as phosphor with respect to the total amount of master pellets
  • the evaluation results are shown in Table 1.
  • FIG. 20 shows an xy chromaticity diagram.
  • Example 2 As described in Table 1, when the light wavelength selection filters A and B and the first light wavelength conversion sheets A and B are arranged, either the x value or the y value is compared with the case where they are not arranged. Either is larger at the same value, or both are larger. The largest change in the x and y values was in Example 2, followed by Example 1.
  • the coordinate position of the strong blue color is the direction in which the x value and the y value become smaller, and on the contrary, the blue color is reduced. , X value and y value become larger.
  • either the x value or the y value is the same value and either is greater than when the light wavelength selection filters A and B are not disposed. Or both are large, that is, the bluish color is reduced, and the light wavelength selection filters A and B and the first light wavelength conversion sheets A and B are partially arranged in the vicinity of the strong bluish color in the lighting device. If it arrange

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Abstract

L'invention concerne un dispositif d'éclairage qui comporte une feuille de conversion de longueur d'onde de lumière, un filtre de sélection de longueur d'onde de lumière et un élément électroluminescent, et qui est caractérisé : en ce que l'élément électroluminescent, la feuille de conversion de longueur d'onde de lumière et le filtre de sélection de longueur d'onde de lumière sont agencés dans le dispositif dans cet ordre ; en ce que l'aire du filtre de sélection de longueur d'onde de lumière est inférieure à l'aire de la feuille de conversion de longueur d'onde de lumière ; et en ce que l'élément électroluminescent est agencé à une certaine distance de la feuille de conversion de longueur d'onde de lumière. L'invention concerne : un dispositif d'éclairage dont l'inégalité de couleurs est supprimée en améliorant le problème de différence de couleur entre la couleur proche de la partie centrale et la couleur proche de la partie de bord du dispositif d'éclairage ; et un dispositif d'affichage qui utilise ce dispositif d'éclairage.
PCT/JP2016/064843 2015-05-20 2016-05-19 Dispositif d'éclairage et dispositif d'affichage WO2016186158A1 (fr)

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WO2019065188A1 (fr) * 2017-09-27 2019-04-04 東レ株式会社 Unité de source de lumière
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WO2019225423A1 (fr) * 2018-05-25 2019-11-28 パナソニックＩｐマネジメント株式会社 Filtre optique, filtre optique multiplex, et dispositif électroluminescent et système d'éclairage utilisant lesdits filtres
JP2020067663A (ja) * 2018-10-25 2020-04-30 三星ディスプレイ株式會社Ｓａｍｓｕｎｇ Ｄｉｓｐｌａｙ Ｃｏ．，Ｌｔｄ． 表示装置
JP2020516015A (ja) * 2017-03-28 2020-05-28 ナノシス・インク． 量子ドットを使用してマイクロｌｅｄ装置の光出力を増大させる方法
WO2020153197A1 (fr) * 2019-01-23 2020-07-30 パナソニックＩｐマネジメント株式会社 Structure de cristal colloïdal, et dispositif électroluminescent et système d'éclairage l'utilisant
JP6798655B1 (ja) * 2019-06-14 2020-12-09 昭和電工マテリアルズ株式会社 波長変換部材及びその使用、バックライトユニット、並びに画像表示装置
JP2022022964A (ja) * 2020-03-31 2022-02-07 大日本印刷株式会社 面光源装置および表示装置
JP2022532816A (ja) * 2018-11-28 2022-07-20 アイセーフ インコーポレイテッド 発光の改変

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JP2022022964A (ja) * 2020-03-31 2022-02-07 大日本印刷株式会社 面光源装置および表示装置
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