WO2016158371A1 - 照明装置、表示装置及びテレビ受信装置 - Google Patents
照明装置、表示装置及びテレビ受信装置 Download PDFInfo
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- WO2016158371A1 WO2016158371A1 PCT/JP2016/058091 JP2016058091W WO2016158371A1 WO 2016158371 A1 WO2016158371 A1 WO 2016158371A1 JP 2016058091 W JP2016058091 W JP 2016058091W WO 2016158371 A1 WO2016158371 A1 WO 2016158371A1
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- light
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- 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
- F21K9/64—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—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
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
- G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
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- 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
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- 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
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- 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
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—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 characterised by the light source being coupled to the light guide
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
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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
- G02F1/1336—Illuminating devices
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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
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- 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]
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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
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133608—Direct backlight including particular frames or supporting means
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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
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133613—Direct backlight characterized by the sequence of light sources
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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
- G02F1/1336—Illuminating devices
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
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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
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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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
- G02F2202/00—Materials and properties
- G02F2202/36—Micro- or nanomaterials
Definitions
- the present invention relates to a lighting device, a display device, and a television receiver.
- the liquid crystal display device includes an illumination device (backlight device) that supplies light to the liquid crystal panel together with the liquid crystal panel.
- an illumination device backlight device
- a so-called edge light type (or side light type) device is known in which LEDs (Light Emitting Diodes) are arranged along the end face of the light guide plate.
- LEDs Light Emitting Diodes
- Such an illuminating device is arranged on the back side of the liquid crystal panel, and supplies light spread in a planar shape toward the back side of the liquid crystal panel.
- the light emitted from the end side (peripheral side) of the light emitting surface is primary without being wavelength-converted because the number of retroreflections is less than the light emitted from the center side. A lot of light in the light state is emitted. For this reason, light with an end side (peripheral side) colored with a primary light color (for example, blue) may be emitted from the center side.
- a primary light color for example, blue
- An object of the present invention is to provide a technique for suppressing color unevenness of emitted light whose end side is colored by the color of the primary light of the light source from the center side in an edge light type illumination device using a phosphor sheet as an optical member. It is.
- An illumination device includes a light source that emits primary light included in a predetermined wavelength region, a light incident surface that is opposed to the light source and on which the primary light from the light source is incident, and the light incident surface.
- a light exit surface that emits the incident primary light, an opposite surface that is disposed on the opposite side of the light exit surface, and has light reflectivity and light scattering properties on the opposite surface in a spread state. It consists of a collection of a plurality of dot portions to be formed, and is provided on the end side of the opposite surface among the plurality of dot portions and has a relationship between a reference color and a complementary color that the primary light exhibits by absorbing the primary light.
- a light guide plate having a plurality of complementary color dot portions exhibiting a certain color, and a light reflection / scattering pattern having a plurality of white dot portions arranged in the center of the complementary color dot portions and exhibiting white, and the primary light Different from the wavelength region when excited.
- the illuminating device having such a configuration can suppress uneven color of emitted light (surface light) that is colored with the primary light color of the light source at the end side rather than at the center side.
- the light reflection / scattering pattern may be set such that a density per unit area on the opposite surface gradually increases as the distance from the light incident surface increases.
- the light reflection / scattering pattern has a density per unit area on the opposite surface that is closer to a light source non-facing end surface than an end surface of the light guide plate that does not face the light source, compared to the light incident surface side. It may be set to be higher.
- the plurality of complementary color dot portions may be set so that a color having a relationship of the reference color and the complementary color gradually becomes lighter from the end side of the opposite surface toward the center side.
- the plurality of complementary color dot portions may be provided on the opposite surface along the end portion of the light guide plate.
- the plurality of complementary color dot portions are provided on the opposite surface so as to be along a light source non-opposing adjacent end portion including a light source non-facing adjacent end surface that is adjacent to the light incident surface and does not face the light source. May be.
- the plurality of complementary color dot portions may have a frame shape surrounding the plurality of white dot portions.
- the complementary color dot portion may be set so that a color having a complementary color relationship with the reference color is exhibited entirely or partially.
- the dot portion constituting the light reflection / scattering pattern includes a coating film containing a colorant, and the complementary color dot portion absorbs the primary light as the colorant and absorbs the primary light. May include a complementary colorant exhibiting a color complementary to the reference color exhibited by.
- the dot portion constituting the light reflection / scattering pattern is formed of a dot-shaped recess formed on the opposite surface of the light guide plate, and the complementary color dot portion is formed on the recess with the primary light. It may be formed by applying a paint exhibiting a color complementary to the reference color exhibited by the primary light.
- the primary light is blue light
- the wavelength conversion member is excited by the blue light as the primary light and emits green light as the secondary light as the phosphor. It contains at least a phosphor and a red phosphor that is excited by the blue light as the primary light and emits red light as the secondary light, and the complementary color dot portion exhibits a yellow color. Good.
- the illumination device may include a reflective polarizing member disposed so as to cover the wavelength conversion member.
- the display device includes the illumination device and a display panel that displays an image using light from the illumination device.
- the display panel may be a liquid crystal panel.
- the television receiver according to the present invention includes the display device.
- FIG. 1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention.
- the top view which represented typically the arrangement
- the top view which represented typically the arrangement
- FIG. The figure which shows the complementary color dot part of the modification 1.
- Embodiment 1 of the present invention will be described with reference to FIGS.
- a television receiver 10TV an example of the liquid crystal display device 10) including the illumination device (backlight device) 12 is illustrated.
- the illumination device backlight device 12
- an X axis, a Y axis, and a Z axis are shown.
- FIG. 1 is an exploded perspective view showing a schematic configuration of a television receiver 10TV according to Embodiment 1 of the present invention
- FIG. 2 is a cross-sectional view taken along line AA of FIG.
- the television receiver 10TV mainly includes a liquid crystal display device (an example of a display device) 10 and both front and back cabinets 10Ca and 10Cb that hold the liquid crystal display device 10 so as to be sandwiched from both front and rear (front and back) sides.
- a power source 10P a power source 10P, a tuner (reception unit) 10T that receives a television signal, and a stand 10S.
- the liquid crystal display device 10 of the present embodiment generally has a horizontally long rectangular shape extending long in the left-right direction. Further, as shown in FIG. 2, the liquid crystal display device 10 mainly includes a liquid crystal panel 11 used as a display panel, and an illumination device (backlight device) as an external light source that supplies light to the liquid crystal panel 11. 12 and a frame-like bezel 13 for holding the liquid crystal panel 11, the lighting device 12, and the like.
- a liquid crystal panel 11 used as a display panel
- an illumination device backlight device
- a frame-like bezel 13 for holding the liquid crystal panel 11, the lighting device 12, and the like.
- the liquid crystal panel 11 mainly comprises a pair of transparent substrates and a liquid crystal layer sealed between them, and utilizes the light emitted from the illumination device 12 to provide a panel. An image is displayed in a state that is visible on the surface.
- the liquid crystal panel 11 generally has a horizontally long rectangular shape in plan view.
- one substrate is an array substrate, and TFTs (Thin Film Transistors), pixel electrodes, etc., which are switching elements, are arranged in a matrix on a transparent glass substrate.
- TFTs Thin Film Transistors
- pixel electrodes, etc. which are switching elements, are arranged in a matrix on a transparent glass substrate.
- the other substrate is a color filter (hereinafter referred to as CF) substrate, which is formed by arranging color filters of red, green, and blue in a matrix on a transparent glass substrate.
- CF color filter
- the lighting device 12 is a device that is arranged on the back side of the liquid crystal panel 11 and supplies light toward the liquid crystal panel 11.
- the illuminating device 12 is configured to emit white light.
- the illuminating device 12 of this embodiment is what is called an edge light type (or side light type).
- the illumination device 12 includes a chassis 14, an optical member 15, a frame 16, an LED 17, an LED substrate 18, a light guide plate 19, a reflection sheet 20, and the like.
- the chassis 14 generally has a substantially box shape opened to the front side, and is made of a metal plate such as an aluminum plate or an electrogalvanized steel plate (SECC). Similar to the liquid crystal panel 11 and the like, the chassis 14 includes a bottom plate 14a having a substantially rectangular shape in plan view, and a side wall plate 14b surrounding the bottom plate 14a while rising from the periphery of the bottom plate 14a.
- SECC electrogalvanized steel plate
- Various members such as the LED 17, the LED substrate 18, the reflection sheet 20, the light guide plate 19, and the optical member 15 are accommodated inside the chassis 14.
- a board such as a control board and an LED driving board (not shown) is attached to the outside of the chassis 14.
- the reflection sheet (an example of a reflection member) 20 is a light-reflective sheet-like member, and is made of, for example, white foamed polyethylene terephthalate (an example of a white plastic sheet). Further, the light guide plate 19 is accommodated in the chassis 14 so as to be placed on the reflection sheet 20.
- the light guide plate 19 is made of a synthetic resin material (for example, acrylic resin such as PMMA, polycarbonate resin, etc.) that has a refractive index sufficiently higher than air, is transparent, and is excellent in light transmittance. Similar to the liquid crystal panel 11 and the like, the light guide plate 19 is made of a plate-like member having a substantially rectangular shape in a plan view, and the front surface 19 a faces the liquid crystal panel 11 and the back surface (opposite surface) 19 b faces the reflection sheet 20. Thus, it is accommodated in the chassis 14.
- a synthetic resin material for example, acrylic resin such as PMMA, polycarbonate resin, etc.
- the surface 19a of the light guide plate 19 is a light emitting surface 19a that emits light toward the liquid crystal panel 11 side. Between the light emitting surface 19a and the liquid crystal panel 11, the optical member 15 is disposed in a state supported by the frame 16. Further, one long side end surface 19c of the light guide plate 19 is a light incident surface 19c on which light from the LED 17 is incident. The end portion of the light guide plate 19 including the light incident surface 19c is referred to as an incident end portion 190.
- the other long side end surface 19d of the light guide plate 19 and the two short side end surfaces 19e and 19f of the light guide plate 19 do not face the LED 17 and the light source (LED 17), they are referred to as “light source non-opposing end surfaces”. There is a case.
- the end portions 191, 192, and 193 of the light guide plate including the light source non-opposing end surface may be referred to as “light source non-opposing end portions”.
- the short-side end surfaces 19e and 19f of the light guide plate 19 which are adjacent to the light incident surface 19c and do not face the LED (light source) 17 are referred to as “light source non-opposing adjacent end surfaces” and include the light source non-opposing adjacent end surfaces.
- the 19 end portions 192 and 193 may be referred to as “light source non-opposing adjacent ends”.
- the light source non-facing end surface (long-side end surface 19d) on the opposite side of the light incident surface 19c is referred to as “opposite light source non-facing end surface”, and the end of the light guide plate 19 including the opposite light source non-facing end surface 191 may be referred to as an “opposite side light source non-facing end”.
- the frame 16 generally has a frame shape (frame shape) that covers the outer peripheral end of the light guide plate 19 from the front side, and is assembled to the opening of the chassis 14 from the front side.
- the frame 16 is made of, for example, a synthetic resin and is painted white so as to have light reflectivity.
- the frame 16 has a frame shape in plan view, and an inner peripheral edge thereof is addressed from the front side to the outer peripheral end of the light guide plate 19 accommodated in the chassis 14, and the frame main body portion A standing wall portion 162 that extends from 161 toward the bottom plate 14 a side of the chassis 14 and is accommodated in the chassis 14 is provided.
- the frame main body 161 has a frame shape with a predetermined width such that the inner peripheral edge side overlaps with the outer peripheral end portion of the light guide plate 19 and the outer peripheral edge side overlaps with the upper end portion of the side wall plate 14b of the chassis 14.
- An elastic member 21 made of urethane foam or the like is attached to the back surface on the inner peripheral edge side of the frame main body portion 161.
- the elastic member 21 of this embodiment is black and has a light shielding property.
- the elastic member 21 has a frame shape (annular shape) as a whole, and comes into contact with the outer peripheral end of the light guide plate 19 from the front side.
- the inner peripheral edge surface of the frame main body 161 is set to be one step lower than the outer peripheral edge surface, and the end of the optical member 15 is placed on the lower portion.
- a projection (not shown) is provided on the inner peripheral surface of the frame body 161, and a hole provided at the end of the optical member 15 is fitted into the projection so that the optical member is fitted. 15 is supported by the frame main body 161.
- the standing wall portion 162 has a plate shape that faces the end surface 19c of the light guide plate 19 while extending from the back surface on the outer peripheral edge side of the frame main body portion 161 toward the bottom plate 14a of the chassis 14. Further, the standing wall 162 has a cylindrical shape that surrounds the light guide plate 19 as a whole.
- An LED substrate 18 on which the LEDs 17 are mounted is attached to a portion of the standing wall 162 that faces the one long side end surface 19c of the light guide plate 19. The remaining portions other than the portion to which the LED substrate 18 is attached are accommodated in the chassis 14 so as to be fitted between the end face of the light guide plate 19 and the side wall plate 14b of the chassis 14, respectively.
- LED (an example of a light source) 17 contains a chip-like blue LED element (blue light emitting element) that is a light emitting source, a transparent sealing material that seals the blue LED element, and a blue LED element and a sealing material. And a substantially box-shaped case portion configured to emit blue light.
- the blue LED element is, for example, a semiconductor made of InGaN or the like, and light (that is, blue light) included in the wavelength region of blue light (about 420 nm to about 500 nm) when a voltage is applied in the forward direction. Is emitted. In the present specification, the light emitted from the LED 17 may be referred to as primary light.
- FIG. 3 is a plan view schematically showing the arrangement relationship between the LED 17 and the light guide plate 19 as viewed from the front side.
- the LED 17 is a so-called top emission type, and is surface-mounted on a plate surface 18a of the LED substrate 18 having a long shape.
- a plurality of LEDs 17 are mounted on the LED substrate 18 so as to be arranged in a line at equal intervals.
- the LED 17 is mounted on the LED board 18 and is attached to the standing wall 162 of the frame 16 so that the light emitting surface 17a faces one long side end surface (light incident surface) 19c of the light guide plate 19. Thus, it is accommodated in the chassis 14.
- the LED 17 emits light (blue light) toward the light incident surface 19 c of the light guide plate 19.
- the optical member 15 has a horizontally long and substantially rectangular shape in plan view, like the liquid crystal panel 11 and the like.
- the optical member 15 is arranged between the light emitting surface 19 a of the light guide plate 19 and the back surface of the liquid crystal panel 11 such that the outer peripheral end portion thereof is placed on the frame main body portion 161 of the frame 16 from the front side.
- the optical member 15 has a function of transmitting light emitted from the light guide plate 19 to the liquid crystal panel 11 side while providing a predetermined optical action.
- the optical member 15 is composed of a plurality of sheet-like members (optical sheets) stacked on each other.
- optical sheets include, for example, a diffusion sheet, a lens sheet, a reflective polarizing sheet, and the like.
- the optical member 15 of the present embodiment includes a phosphor sheet (an example of a wavelength conversion member) 150 containing a quantum dot phosphor as an essential member (optical sheet).
- the phosphor sheet 150 is disposed closest to the light emitting surface 19 a side.
- the phosphor sheet 150 Similar to the liquid crystal panel 11 and the like, the phosphor sheet 150 has a substantially rectangular shape in plan view.
- the phosphor sheet 150 transmits a part of the light from the LED 17 in the thickness direction as it is, absorbs a part of the light from the LED 17 and converts the light into light (secondary light) in another wavelength region. It has a function to release.
- Such a phosphor sheet 150 includes, for example, a wavelength conversion layer, a pair of support layers that sandwich the wavelength conversion layer, and a pair of barriers that are stacked outside each support layer and sandwich the wavelength conversion layer and the pair of support layers. With layers.
- the wavelength conversion layer contains an acrylic resin as a binder resin and a quantum dot phosphor (an example of a phosphor) blended in a dispersed state in the acrylic resin.
- the acrylic resin is transparent, has optical transparency, and has adhesion to the support layer.
- the support layer is a sheet-like (film-like) member made of a polyester-based resin such as polyethylene terephthalate (PET).
- Quantum dot phosphors are phosphors with excellent quantum efficiency. They confine electrons, holes, and excitons in all directions in a three-dimensional space in a nano-sized semiconductor crystal (for example, about 2 nm to 10 nm in diameter). The peak wavelength (emission color) of emitted light can be freely selected by changing the size of the dot having discrete energy levels.
- a green quantum dot phosphor that emits green light (wavelength region of about 500 nm to about 570 nm) and a red light (about 600 nm to about 780 nm).
- a red quantum dot phosphor that emits light in a wavelength region).
- the emission spectrum of green light and the emission spectrum of red light emitted from the green quantum dot phosphor and the red quantum dot phosphor have sharp peaks, respectively, and their half-value widths are narrowed. Each purity of red light becomes extremely high, and their color gamut is also widened.
- the green quantum dot phosphor absorbs light from the LED 17 (blue light, primary light, excitation light) and is excited to emit green light (wavelength range of about 500 nm to about 570 nm). That is, the green quantum dot phosphor has a function of converting light (blue light, primary light, excitation light) from the LED 17 into other light (green light, secondary light) having a different wavelength region.
- the red quantum dot phosphor absorbs light from the LED 17 (blue light, primary light, excitation light) and is excited to emit red light (wavelength range of about 600 nm to about 780 nm). That is, the red quantum dot phosphor has a function of converting light (blue light, primary light, excitation light) from the LED 17 into other light (red light, secondary light) having a different wavelength region.
- Materials used for the quantum dot phosphor include a combination of Zn, Cd, Pb and the like that can be a divalent cation and O, S, Se, Te, and the like that can be a divalent anion (for example, , Cadmium selenide (CdCe), zinc sulfide (ZnS), etc.), a combination of Ga, In, etc., which can be a trivalent cation, and P, As, Sb, etc., which can be a trivalent anion (for example, phosphorus Indium phosphide (InP), gallium arsenide (GaAs), and the like, and chalcopyrite type compounds (CuInSe 2 and the like).
- CdSe is used as an example of the material of the quantum dot phosphor.
- quantum dot phosphors green quantum dot phosphors and red quantum dot phosphors
- the acrylic resin constituting the wavelength conversion layer so as to be substantially uniform.
- other components such as a scattering agent may be included.
- the barrier layer is made of a metal oxide film such as alumina or silicon oxide, and has a function of protecting the quantum dot phosphor in the wavelength conversion layer from coming into contact with moisture (moisture) or oxygen.
- the barrier layer is formed on the support layer by using, for example, a vacuum deposition method.
- FIG. 4 is a plan view schematically showing the arrangement relationship between the LED 17 and the light guide plate 19 as viewed from the back side. As shown in FIG. 4, a light reflection / scattering pattern 220 is formed on the back surface (opposite surface) 19 b of the light guide plate 19.
- the light reflection / scattering pattern 220 has a function of reflecting or scattering light incident on the light guide plate 19 and rising toward the light exit surface 19a side.
- the light reflection / scattering pattern 220 is composed of a collection of a plurality of dot portions 22 each having light reflectivity and scattering properties.
- the plurality of dot portions 22 spread in a planar shape on the back surface (opposite surface) 19b of the light guide plate 19 while forming a predetermined pattern.
- Each dot portion 22 has a circular shape in plan view.
- the plurality of dot portions 22 of the present embodiment are provided on the respective end portions 190, 191, 192, and 193 side of the light guide plate 19, absorb primary light (blue light) from the LED 17, and produce primary light (blue light). ), A plurality of complementary color dot portions 22a exhibiting a color (yellow) complementary to the reference color (blue), and a plurality of white dot portions 22b arranged on the center side of the complementary color dot portion 22a and exhibiting white It has.
- the dot portion 22 of the present embodiment is made of a coating material obtained by adding a colorant or the like to a base resin (that is, a coating film).
- the dot portions 22 are appropriately formed on the back surface 19b of the light guide plate 19 using a known printing technique such as silk printing or ink jet printing.
- a colorant a pigment, a dye or the like corresponding to the target color is used.
- the complementary color dot portion 22a absorbs primary light (blue light) from the LED 17 as a colorant, and a color (yellow) that is complementary to the reference color (blue) exhibited by the primary light (blue light).
- a yellow colorant that exhibits (reflects) is used.
- a yellow pigment, a yellow dye, a yellow phosphor, or the like is used as the yellow colorant.
- a white pigment, a white dye, or the like is used as a colorant.
- the light reflection / scattering pattern 220 is set so that the density per unit area to be formed differs depending on the location of the back surface (opposite surface) 19b of the light guide plate 19. For example, as shown in FIG. 4, the light reflection / scattering pattern 220 has a density per unit area on the back surface (opposite surface) 19b as it moves away from the light incident surface 19c toward the opposite light source non-facing end surface 19d. It is set to gradually increase.
- the density per unit area S1 of the dot portion 22 (light reflection / scattering pattern 220) in the vicinity of the light incident surface 19c in the back surface 19b is set low, and the opposite side light source is not opposed.
- the density per unit area S3 of the dot portion 22 (light reflection / scattering pattern 220) near the end face 19d is set high.
- the density per unit area S2 of the dot portion 22 (light reflection / scattering pattern 220) at the position between the light incident surface 19c and the opposite light source non-facing end surface 19d of the back surface 19b is the unit area S1. Is set to be lower than the density per unit area S3.
- the light reflection / scattering pattern 220 has an end surface (light source non-opposing end surface) of the light guide plate 19 whose density per unit area on the back surface (opposite surface) 19b does not face the LED (light source) 17 as compared with the light incident surface 19c side. ) 19d, 19e, 19f side is set to be higher. As shown in FIG. 4, the dot portion 22 (light reflection / scattering pattern 220) in the vicinity of one light source non-facing end surface (that is, the light source non-facing adjacent end surface) 19e adjacent to the light incident surface 19c in the back surface 19b.
- the density per unit area S4 is set higher than the density per unit area S1.
- the dot portion 22 (light reflection / scattering pattern 220) per unit area S5 near the other light source non-facing end surface (that is, the light source non-facing adjacent end surface) 19f adjacent to the light incident surface 19c The density is set higher than the density per unit area S1.
- the density per unit area S3 of the dot portion 22 (light reflection / scattering pattern 220) in the vicinity of the opposite light source non-facing end surface 19d in the back surface 19b is higher than the density per unit area S1. Is also set high.
- the density (dense / dense) of the light reflection / scattering pattern 220 per unit area on the back surface 19b can be adjusted by appropriately setting the size and number of dot portions.
- FIG. 5 is an enlarged cross-sectional view of the liquid crystal display device 10 in which the vicinity of the LED 17 is enlarged
- FIG. 6 is an enlarged cross-sectional view of the liquid crystal display device 10 in which the vicinity of the light source non-opposing adjacent end 192 is enlarged. 6 is a cross-sectional view of a portion corresponding to the line BB in FIG.
- the amount of light supplied from the LED 17 into the light guide plate 19 is reduced to the light incident surface 19c side or back surface. Compared to the central side of 19b, there is a tendency to decrease. Further, even near the light source non-opposing adjacent end faces 19e and 19f adjacent to the light incident surface 19c, the amount of light supplied from the LED 17 into the light guide plate 19 is compared with the light incident surface 19c side and the center side of the back surface 19c. Tend to decrease. Therefore, in such a place, by increasing the density per unit area of the dot portions 22 (light reflection / scattering pattern 220) to be formed, a sufficient amount from the light guide plate 19 toward the light exit surface 19a side. Has launched a light.
- the density per unit area of the light reflection / scattering pattern 220) is increased.
- the density per unit area of the complementary color dot portion 22a is higher in the vicinity of the light source non-opposing adjacent end faces 19e and 19f than in the vicinity of the opposite light source non-opposing end face 19d.
- the plurality of complementary color dot portions 22a have a frame shape surrounding the plurality of white dot portions 22b.
- the plurality of complementary color dot portions 22 a are formed on the back surface 19 b along the end portions 190, 191, 192, and 193 of the light guide plate 19. That is, the complementary color dot portion 22a is formed on the back surface 19b in a shape along the direction in which each side of the light guide plate 19 extends.
- the complementary color dot portions 22a formed at the respective non-light source adjacent end portions 192 and 193 are more than the complementary color dot portions 22a formed at the opposite light source non-facing end portion 191 and the incident end portion 190.
- the density per unit area is set to be high.
- the complementary color dot portion 22a formed at the opposite-side light source non-opposing end portion 191 is set to have a higher density per unit area than the complementary color dot portion 22a formed at the incident end portion 190.
- each LED 17 when power is supplied to each LED 17, each LED 17 is turned on, and light (primary light, blue light) emitted from each LED 17 is transmitted from the light incident surface 19c to the light guide plate 19. Incident in.
- the light incident on the light guide plate 19 propagates while being repeatedly reflected in the light guide plate 19.
- the light hitting the light reflection / scattering pattern 220 (dot portion 22) on the back surface 19 b rises toward the light exit surface 19 a and further travels from the light exit surface 19 a to the phosphor sheet 150. Supplied.
- the phosphor sheet 150 As described above, part of blue light is transmitted as it is as blue light, but the other part of blue light is wavelength-converted and emitted as yellow light.
- Light (blue light, yellow light) emitted from the phosphor sheet 150 is reflected on another optical member (optical sheet) 15 laminated on the phosphor sheet 150 or on the back surface 19b side of the light guide plate 19. After passing through the phosphor sheet 150 a plurality of times while repeating the retroreflection a plurality of times by hitting the sheet 20 or the like, it finally spreads from the optical member 15 so as to face the back surface of the liquid crystal panel 11. It is emitted as light (surface light).
- FIG. 3 shows the light guide plate 19 as viewed from the light exit surface 19a side.
- the light emitting surface 19a having a rectangular shape
- the number of retroreflections is reduced compared to the region on the center side of the surface 19a.
- the light emitting surface 19a In the light emitting surface 19a, light is supplied mainly to the central region from the plurality of LEDs 17 arranged on the central side among the plurality of LEDs 17 arranged in a line.
- the regions R1 and R2 existing on the left and right sides of the light exit surface 19a are supplied from the LEDs 17 arranged on the end side among the plurality of LEDs 17 arranged in a line.
- each LED 17 has an orientation distribution that spreads at a certain angle, the straightness is high. Therefore, light from each LED 17 disposed on the center side of the LED substrate 18 is difficult to be supplied to both end sides of the light guide plate 19 (on the side of the non-opposing adjacent end surfaces 19e and 19f adjacent to the light incident surface 19c). Yes.
- a rectangular region (dashed line) 130 shown along the peripheral edge of the light emitting surface 19 a is the inner periphery of the frame 16 (the inner periphery of the frame main body 161, the inner periphery of the bezel 13. ) Position.
- the light actually supplied to the liquid crystal panel 11 that is, the light emitted from the illumination device 12
- the region R11 surrounded by the region 130 and the region R1 and the region R22 surrounded by the region 130 and the region R2 are mainly recursive compared to the center side. This is a portion where light with a small number of reflections is emitted.
- the range is considerably narrower than the regions R1 and R2 (regions R11 and R22), a portion along the opposite light source non-opposing end surface 19d and a portion along the light incident surface 19c in the light emitting surface 19a. Also, the number of retroreflections is reduced for the light emitted from the two.
- the complementary color dot portion 22a of the light reflection / scattering pattern 220 is arranged on the back surface 19b of the light guide plate 19 so that it overlaps at least in plan view with a portion where light with a small number of retroreflections is emitted. Is done.
- the complementary color dot portions 22a exhibiting yellow are arranged in the respective regions R1 and R2. That is, when the light guide plate 19 is viewed in plan, the complementary color dot portion 22a is formed so as to overlap the regions R1 and R2 wider than the regions R11 and R22 described above.
- a complementary color dot portion 22 a exhibiting yellow is formed on the back surface 19 b of the light guide plate 19 so that the portion along the opposite light source non-facing end surface 19 d and the portion along the light incident surface 19 c overlap each other. .
- the light reflection / scattering pattern 220 is entirely composed of the white dot portion 22b, when light is supplied from each LED 17, the abundance ratio of blue light from the regions R11 and R22 of the light guide plate 19 is higher than the center side. The rising light will be emitted. In that case, on the display surface of the liquid crystal panel 11, both end portions (portions corresponding to the regions R11 and R22) are more bluish than the center side.
- the portion along the opposite light source non-facing end surface 19d and the portion along the light incident surface 19c are similarly blue.
- the light whose light abundance ratio is higher than that at the center side is emitted.
- the light reflection / scattering pattern 220 in which the complementary color dot portions 22a and the white dot portions 22b that absorb primary light (blue light) form a predetermined arrangement pattern is used as the light guide plate. 19, the complementary color dot portion 22a appropriately absorbs primary light (blue light), and the blue and complementary colors in the regions R11, R22 (R1, R2), etc. of the light exit surface 19a It is possible to increase the abundance ratio of light (complementary light) exhibiting yellow and to reduce the abundance ratio of light (blue light) exhibiting blue.
- the lighting device 12 emits whited light on both ends as well as the center side. That is, in the illuminating device 12, in the emitted light (surface light) spread in a planar shape, the end side (the light source non-opposing adjacent end portions 192 and 193 side, etc.) is the primary light color (blue) of the LED 17 than the center side. Coloring is suppressed.
- Embodiment 2 of the present invention will be described with reference to FIG.
- a lighting device in which the light reflection / scattering pattern 220 of the first embodiment is replaced with a light reflection / scattering pattern 220A will be described.
- the basic configuration of the illumination device of the present embodiment is the same as that of the first embodiment. Therefore, the same configurations as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and detailed description thereof is omitted.
- FIG. 7 is a plan view schematically showing an arrangement relationship between the LED 17 and the light guide plate 19A in the state viewed from the back side, which is used in the lighting device of the second embodiment.
- the light guide plate 19A of this embodiment is different from the light guide plate 19 of the first embodiment except for the light reflection / scattering pattern 220A formed on the back surface (opposite surface) 19b, but the other configuration is the same.
- the light reflection / scattering pattern 220A includes a plurality of dot portions 22A having a plurality of complementary color dot portions 22Aa exhibiting yellow and a white dot portion 22Ab exhibiting white, as in the first embodiment. ing.
- the arrangement pattern (density per unit area) of the dot portions 22A themselves formed on the back surface 19b is the same as that in the first embodiment.
- the complementary color dot portion 22Aa is arranged in a frame shape on the back surface 19b along the end portions 190, 191, 192, and 193 of the light guide plate 19A.
- a plurality of white dot portions 22Ab are arranged inside the complementary color dot portions 22Aa arranged in a frame shape.
- the complementary color dot portion 22Aa of this embodiment the color (yellow) that is in a complementary color relationship with the reference color (blue) gradually becomes lighter from the respective end sides of the back surface (opposite surface) 19b toward the center side.
- the complementary color dot portion 22 ⁇ / b> Aa is arranged in a frame shape along the outer edge of the back surface 19 b, and each of the complementary color dot portion 22 ⁇ / b> Aa ⁇ b> 1 and the outer complementary color dot portion 22 ⁇ / b> Aa ⁇ b> 1 each exhibit a relatively dark yellow color.
- Are also arranged on the center side have a frame shape surrounding the white dot portion 22Ab, and each has an inner complementary color dot portion 22Aa2 that exhibits a relatively light yellow color.
- the light reflection / scattering pattern 220A is entirely composed of the white dot portion 22Ab, the light is reflected from the regions R11 and R22 of the light guide plate 19A (the light guide plate 19 of the first embodiment, see FIG. 3).
- the light whose light abundance ratio is higher than that at the center side is emitted.
- the abundance ratio of blue light there exists a tendency for the abundance ratio of blue light to become higher. That is, on the display surface of the liquid crystal panel 11, among both end portions (portions corresponding to the regions R11 and R22), the end side is particularly bluish.
- the color (yellow) of the complementary color dot portion 22Aa when the color (yellow) of the complementary color dot portion 22Aa is set so as to gradually become thinner from each end side of the back surface (opposite surface) 19b toward the center side, the blue light
- the absorption efficiency of the primary light (blue light) by the complementary color dot portion 22Aa can be controlled in accordance with the existence ratio. Even in outgoing light (surface light) that is spread out in a planar shape and is emitted from an illuminating device including such a light guide plate 19A, the end side (light source non-opposing adjacent ends 192, 193 side, etc.) is LED 17 more than the center side. Coloring with the primary light color (blue) is suppressed.
- one of the end surfaces on the long side of the end surfaces of the light guide plate is set as the light incident surface.
- the present invention is not limited to this, for example, two long side sides These end faces may be used as light incident surfaces, and one or two end faces on the short side may be used as light incident surfaces.
- each dot portion constituting the light reflection / scattering pattern has a circular shape in plan view.
- the present invention is not limited to this, and a polygonal shape, an elliptical shape, an irregular shape, etc. Other shapes may be used.
- the complementary color dot portion is set so that the reference color (blue light) exhibited by the primary light and the color (yellow) in a complementary color relationship are fully exhibited.
- the present invention is not limited to this, and a part of the dot portion may exhibit a color (yellow) that is complementary to the reference color (blue light), and the remaining portion may exhibit white.
- the annular portion surrounding the white portion on the center side is complementary to the reference color (blue light). You may set so that the color (yellow) which has a relationship may be exhibited.
- the complementary color dot portion 22Ca of the modification 2 shown in FIG. 9 one of the two semicircular portions is white, and the other semicircular portion is the reference color (blue light).
- the color may be a complementary color (yellow).
- the complementary color dot portion 22Da of Modification 3 shown in FIG. 10 one portion (1/4 portion) of the portions divided into four is white and the remaining portion (3/4).
- the complementary color dot portion may partially exhibit a color (yellow) complementary to the reference color (blue light), and the density of the complementary color dot portion per unit area may be adjusted.
- FIG. 11 is a diagram showing a part of a light reflection / scattering pattern according to another embodiment. As shown in FIG. 11, white dot portions Eb are arranged between adjacent complementary color dot portions 22Ea. In this way, the density of the complementary color dot portions 22Ea per unit area may be adjusted by arranging the dot portions 22E.
- the dot portion constituting the light reflection / scattering pattern was formed from a coating film containing a predetermined colorant.
- the dot portion 22F shown in FIG. 12 includes a dot-shaped recess 23 formed on the back surface (opposite surface) 19b of the light guide plate 19F by so-called embossing.
- the complementary color dot part 22Fa in this case gave the coating material (coating film) 24 which exhibits the color (yellow) which has a relationship of a complementary color with the reference color which primary light absorbs and the primary light exhibits on the inner surface of the recessed part 23. Consists of things.
- the white dot part in this case is comprised only from the recessed part 23.
- the dot part 22F may be formed from the recessed part 23.
- an LED that emits blue monochromatic light is used as the light source that emits primary light
- an LED that emits light of a color other than blue can also be used as the light source.
- an LED that emits magenta light as primary light can be used.
- a green phosphor is used as the phosphor contained in the phosphor sheet (wavelength conversion member)
- the emitted light of the illumination device can be whitened.
- the complementary color dot portion is set to exhibit green.
- an LED that emits purple light as primary light can be used as a light source.
- a yellow phosphor and a green phosphor are used in a predetermined content ratio as the phosphor to be contained in the phosphor sheet (wavelength conversion member), the emitted light of the illumination device can be whitened.
- the complementary color dot portion is set so as to exhibit a color having a relationship between purple and complementary colors.
- an LED that emits cyan light as primary light can be used as a light source.
- a red phosphor is used as the phosphor contained in the phosphor sheet (wavelength conversion member)
- the emitted light of the illumination device can be whitened.
- the complementary color dot portion is set so as to exhibit a color (red) having a relationship between cyan and complementary colors.
- the quantum dot phosphor used as the phosphor contained in the phosphor sheet (wavelength conversion member) may be a core / shell type or a core type quantum dot phosphor having a single internal composition. It may be.
- the phosphor sheet (wavelength conversion member) contains a quantum dot phosphor as the phosphor.
- other types of phosphors are used as the phosphor. You may make it contain in a sheet
- a sulfide phosphor can be used as the phosphor to be contained in the phosphor sheet (wavelength conversion member).
- SrGa 2 S 4 : Eu 2+ is used as the green phosphor
- (Ca, Sr, Ba) S: Eu 2+ can be used respectively.
- green phosphors to be contained in the phosphor sheet (wavelength conversion member) are (Ca, Sr, Ba) 3 SiO 4 : Eu 2+ , ⁇ -SiAlON: Eu 2+ , Ca 3 Sc 2 Si 3 O 12 : Ce 3+ or the like.
- the phosphor for red contained in the phosphor sheet (wavelength conversion member) can be (Ca, Sr, Ba) 2 SiO 5 N 8 : Eu 2+ , CaAlSiN 3 : Eu 2+, or the like.
- the phosphor for yellow contained in the phosphor sheet (wavelength conversion member) is (Y, Gd) 3 (Al, Ga) 5 O 12 : Ce 3+ (common name: YAG: Ce 3+ ), ⁇ -SiAlON: Eu 2+ , (Ca, Sr, Ba) 3 SiO 4 : Eu 2+ and the like.
- a double fluoride phosphor manganese activated potassium silicofluoride (K 2 TiF 6 ), etc.
- K 2 TiF 6 potassium silicofluoride
- an organic phosphor can be used as the phosphor contained in the phosphor sheet (wavelength conversion member).
- the organic phosphor for example, a low molecular organic phosphor having a basic skeleton of triazole or oxadiazole can be used.
- wavelength conversion is performed by energy transfer via dressed photons (near field light) as a phosphor to be contained in the phosphor sheet (wavelength conversion member). It is also possible to use a phosphor to be used. Specifically, a phosphor having a structure in which a DCM dye is dispersed and mixed in zinc oxide quantum dots (ZnO-QD) having a diameter of 3 nm to 5 nm (preferably about 4 nm) is used as this type of phosphor. preferable.
- ZnO-QD zinc oxide quantum dots
- the emission spectrum of LEDs (numerical value of peak wavelength, numerical value of half width of peak, etc.) and the emission spectrum of phosphor contained in the phosphor layer (numeric value of peak wavelength, half of peak)
- the numerical value of the value range can be changed as appropriate.
- InGaN is used as the material of the LED element constituting the LED.
- the material of the other LED element for example, GaN, AlGaN, GaP, ZnSe, ZnO, AlGaInP or the like is used. It is also possible to use it.
- chassis 14 is made of metal
- chassis may be made of synthetic resin
- an LED is used as a light source, but other light sources such as an organic EL can also be used.
- the liquid crystal panel and the chassis are illustrated in a vertically placed state in which the short side direction coincides with the vertical direction.
- the liquid crystal panel and chassis have the long side direction defined as the vertical direction. What is set to the vertically placed state matched is also included in the present invention.
- the TFT is used as the switching element of the liquid crystal display device.
- the present invention can also be applied to a liquid crystal display device using a switching element other than TFT (for example, a thin film diode (TFD)), and color display
- a switching element other than TFT for example, a thin film diode (TFD)
- color display In addition to the liquid crystal display device, the present invention can be applied to a liquid crystal display device that displays black and white.
- a transmissive liquid crystal display device is exemplified, but the present invention is also applicable to a reflective liquid crystal display device and a transflective liquid crystal display device.
- the television receiver provided with a tuner is exemplified, but the present invention can also be applied to a display device not provided with a tuner. Specifically, the present invention can also be applied to a liquid crystal display device used as an electronic signboard (digital signage) or an electronic blackboard.
- the surface light emitted from the lighting device is set to be white, but the present invention is not limited to this.
- the lighting device may be configured so that surface light that is toned in warm colors such as red and orange or other colors is emitted.
- SYMBOLS 10 Liquid crystal display device (display device), 12 ... Illumination device (backlight device), 13 ... Bezel, 14 ... Chassis, 15 ... Optical member, 150 ... Phosphor sheet (Wavelength conversion member), 16 ... frame, 17 ... LED (light source), 18 ... LED substrate, 19 ... light guide plate, 19a ... light exit surface, 19b ... back surface, 19c ... light incident surface, 20 ... reflective sheet (reflective member), 21 ... elastic member, 220 ... light reflection / scattering pattern, 22 ... dot portion, 22a ... complementary color dot portion, 22b ... White dot
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Abstract
Description
上記照明装置において、光出射面の端側(周縁側)から出射される光は、中央側から出射される光と比べて、再帰反射の回数が少ない等の理由により、波長変換されずに一次光のままの状態の光が多く出射する。そのため、照明装置からは、端側(周縁側)が中央側よりも一次光の色彩(例えば、青色)で色付いた光が出射されることがあった。
本発明に係る照明装置は、所定の波長領域に含まれる一次光を出射する光源と、前記光源と対向しつつ前記光源からの前記一次光が入射される光入射面と、前記光入射面から入射された前記一次光を出射させる光出射面と、前記光出射面の反対側に配される反対面と、光反射性及び光散乱性を有すると共に面状に広がった状態で前記反対面に形成される複数のドット部の集まりからなり、複数の前記ドット部のうち、前記反対面の端部側に設けられかつ前記一次光を吸収して前記一次光が呈する基準色と補色の関係にある色を呈する複数の補色ドット部と、前記補色ドット部よりも中央側に配されかつ白色を呈する複数の白色ドット部とを有する光反射・散乱パターンとを有する導光板と、前記一次光によって励起されて前記波長領域とは異なる他の波長領域に含まれる二次光を放出する蛍光体を含有し、前記光出射面を覆うように配され、前記一次光の一部を透過させて面光を出射する波長変換部材と、を備える。
本発明によれば、蛍光体シートを光学部材として利用するエッジライト式の照明装置において、端側が中央側よりも光源の一次光の色彩で色付く出射光の色ムラを抑制する技術を提供することができる。
本発明の実施形態1を、図1~図6を参照しつつ説明する。本実施形態では、照明装置(バックライト装置)12を備えるテレビ受信装置10TV(液晶表示装置10の一例)について例示する。なお、各図面には、説明の便宜上、X軸、Y軸及びZ軸が示されている。
次いで、本発明の実施形態2を、図7等を参照しつつ説明する。本実施形態では、実施形態1の光反射・散乱パターン220を、光反射・散乱パターン220Aに代えた照明装置について説明する。なお、本実施形態の照明装置の基本的な構成は、上記実施形態1と同様である。そのため、実施形態1と同じ構成については、実施形態1と同じ符号を付し、その詳細説明は省略する。
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。
Claims (15)
- 所定の波長領域に含まれる一次光を出射する光源と、
前記光源と対向しつつ前記光源からの前記一次光が入射される光入射面と、前記光入射面から入射された前記一次光を出射させる光出射面と、前記光出射面の反対側に配される反対面と、光反射性及び光散乱性を有すると共に面状に広がった状態で前記反対面に形成される複数のドット部の集まりからなり、複数の前記ドット部のうち、前記反対面の端部側に設けられかつ前記一次光を吸収して前記一次光が呈する基準色と補色の関係にある色を呈する複数の補色ドット部と、前記補色ドット部よりも中央側に配されかつ白色を呈する複数の白色ドット部とを有する光反射・散乱パターンとを有する導光板と、
前記一次光によって励起されて前記波長領域とは異なる他の波長領域に含まれる二次光を放出する蛍光体を含有し、前記光出射面を覆うように配され、前記一次光の一部を透過させて面光を出射する波長変換部材と、を備える照明装置。 - 前記光反射・散乱パターンは、前記反対面における単位面積当たりの密度が、前記光入射面から遠ざかるにつれて、徐々に高くなるように設定されている請求項1に記載の照明装置。
- 前記光反射・散乱パターンは、前記反対面における単位面積当たりの密度が、前記光入射面側よりも、前記光源と対向しない前記導光板の端面からなる光源非対向端面側の方が高くなるように設定されている請求項1又は請求項2に記載の照明装置。
- 複数の前記補色ドット部は、前記反対面の端側から中央側に向うにつれて、前記基準色と補色の関係にある色が、徐々に薄くなるように設定されている請求項1から請求項3に記載の照明装置。
- 複数の前記補色ドット部は、前記導光板の端部に沿うように前記反対面に設けられている請求項1から請求項4の何れか一項に記載の照明装置。
- 複数の前記補色ドット部は、前記光入射面に隣接し、前記光源と対向しない光源非対向隣接端面を含む光源非対向隣接端部に沿うように前記反対面に設けられている請求項1から請求項5の何れか一項に記載の照明装置。
- 複数の前記補色ドット部は、複数の前記白色ドット部を取り囲むような枠状をなしている請求項1から請求項6の何れか一項に記載の照明装置。
- 前記補色ドット部は、前記基準色と補色の関係にある色が全面的又は部分的に呈するように設定されている請求項1から請求項7の何れか一項に記載の照明装置。
- 前記光反射・散乱パターンを構成する前記ドット部は、着色剤を含有する塗膜を含み、
前記補色ドット部は、前記着色剤として、前記一次光を吸収して前記一次光が呈する基準色と補色の関係にある色を呈する補色着色剤を含む請求項1から請求項8の何れか一項に記載の照明装置。 - 前記光反射・散乱パターンを構成する前記ドット部は、前記導光板の前記反対面に形成されるドット状の凹部からなり、前記補色ドット部は、前記凹部に、前記一次光を吸収して前記一次光が呈する基準色と補色の関係にある色を呈する塗料を付与したものからなる請求項1から請求項8の何れか一項に記載の照明装置。
- 前記一次光は、青色光であり、
前記波長変換部材は、前記蛍光体として、前記一次光としての前記青色光により励起して、前記二次光として緑色光を放出する緑色蛍光体と、前記一次光としての前記青色光により励起して、前記二次光として赤色光を放出する赤色蛍光体とを少なくとも含有し、前記補色ドット部は、黄色を呈する請求項1から請求項10の何れか一項に記載の照明装置。 - 前記波長変換部材を覆うように配される反射型偏光部材を備える請求項1から請求項11に記載の照明装置。
- 請求項1から請求項12の何れか一項に記載の照明装置と、前記照明装置からの光を利用して画像を表示させる表示パネルとを備える表示装置。
- 前記表示パネルは、液晶パネルからなる請求項13に記載の表示装置。
- 請求項13又は請求項14に記載の表示装置を備えるテレビ受信装置。
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