WO2012043438A1 - Lighting apparatus and display device - Google Patents

Lighting apparatus and display device Download PDF

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Publication number
WO2012043438A1
WO2012043438A1 PCT/JP2011/071808 JP2011071808W WO2012043438A1 WO 2012043438 A1 WO2012043438 A1 WO 2012043438A1 JP 2011071808 W JP2011071808 W JP 2011071808W WO 2012043438 A1 WO2012043438 A1 WO 2012043438A1
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WO
WIPO (PCT)
Prior art keywords
emission surface
fluorescent member
light
emission
surface region
Prior art date
Application number
PCT/JP2011/071808
Other languages
French (fr)
Japanese (ja)
Inventor
裕紀 行方
Original Assignee
シャープ株式会社
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Filing date
Publication date
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2012043438A1 publication Critical patent/WO2012043438A1/en

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Classifications

    • 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
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • 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
    • 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
    • G02F1/133617—Illumination with ultraviolet light; Luminescent elements or materials associated to the cell
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • 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
    • G02F2202/04—Materials and properties dye
    • G02F2202/046—Materials and properties dye fluorescent

Definitions

  • the present invention relates to a lighting device and a display device.
  • the liquid crystal display panel that displays images does not emit light, so an illumination device is installed on the back side of the liquid crystal display panel (the side opposite to the display surface side of the liquid crystal display panel)
  • the liquid crystal display panel is illuminated with light from the illumination device.
  • the illuminating device installed in the back surface side of a liquid crystal display panel is called the backlight unit etc., for example.
  • a cold cathode fluorescent lamp in which mercury or xenon is enclosed in a fluorescent tube is known.
  • the cold cathode fluorescent lamp is used as the light source of the backlight unit, there are disadvantages that the light emission luminance and life are insufficient, and that the luminance on the low-pressure side is low, making it difficult to obtain a uniform light emission. It was.
  • the backlight unit is roughly classified into two types, an edge light type and a direct type.
  • An edge-light type backlight unit has a light guide plate arranged directly under a liquid crystal display panel (a region facing the back surface of the liquid crystal display panel), and a light source arranged so as to face a predetermined side end surface of the light guide plate. It is.
  • the edge light type backlight unit when light is emitted from the light source, the light from the light source is introduced into the light guide plate through a predetermined side end surface of the light guide plate. Then, the light introduced into the light guide plate is emitted from the front surface of the light guide plate (the surface directed to the liquid crystal display panel side) to illuminate the liquid crystal display panel.
  • the direct type backlight unit has a light source arranged directly under the liquid crystal display panel.
  • Such a direct type backlight unit is advantageous for illuminating a large area with high output, and is often used for a large-sized liquid crystal display device.
  • the LED package 101 is normally mounted on the mounting surface of the substrate 102, so that the diffusion plate 103 is opposed to the mounting surface of the substrate 102 with a predetermined interval. Is arranged. Thereby, the light emitted from the LED package 101 enters the diffusion plate 103 and is introduced into the diffusion plate 103, and then diffused and emitted from the diffusion plate 103 to illuminate a liquid crystal display panel (not shown). become.
  • the region 100a (LED in FIG.
  • the region 100b region overlapping with the gap between adjacent LED packages 101) becomes darker than the region overlapping with the package 101), resulting in inconvenience that luminance unevenness occurs in the illumination light.
  • the region 100b becomes darker than the region 100a in FIG. 9, and luminance unevenness occurs in the illumination light.
  • This invention was made in order to solve the said subject, and it aims at providing the illuminating device and display apparatus which can suppress that the brightness nonuniformity generate
  • an illumination device has a light source that emits ultraviolet rays and an emission surface that faces the illuminated body side, and introduces ultraviolet rays emitted from the light source to emit light from the emission surface. And a translucent plate that emits light. And the fluorescent member which absorbs an ultraviolet-ray and light-emits is formed on the output surface of a translucent board.
  • the fluorescent member since the ultraviolet ray emitted from the emission surface of the translucent plate is incident on the fluorescent member by being configured as described above, the fluorescent member is excited to emit light, and from the fluorescent member The emitted light becomes the basis of the illumination light. And if it does in this way, since the light emitted from a fluorescent member will spread in all directions, it will become possible to suppress that a brightness nonuniformity arises in illumination light.
  • the amount of ultraviolet light emitted per unit area varies depending on the emission position of the light emitting surface of the light transmitting plate (for example, the amount of ultraviolet light emitted per unit area in the first light emitting surface region of the light emitting surface of the light transmitting plate) Is larger than the amount of ultraviolet light emitted per unit area in the second emission surface area), the fluorescent member formation density in the first emission surface area is reduced, and the fluorescence member in the second emission surface area is reduced.
  • the difference between the amount of ultraviolet light per unit area incident on the fluorescent member in the first emission surface region and the amount of ultraviolet light per unit area incident on the fluorescent member in the second emission surface region (first The difference between the light emission amount per unit area in the one emission surface region and the light emission amount per unit area in the second emission surface region can be reduced. Thereby, even if the amount of ultraviolet rays emitted per unit area differs depending on the emission position of the emission surface of the translucent plate, luminance unevenness generated in the illumination light is effectively suppressed.
  • a fluorescent member that includes a plurality of types of phosphors that are excited by ultraviolet rays to emit light is used. If comprised in this way, white illumination light can be obtained easily.
  • the amount of emitted ultraviolet light per unit area in the first emitting surface region out of the emitting surface of the translucent plate is larger than the amount of emitted ultraviolet light per unit area in the second emitting surface region.
  • the formation density of the fluorescent member in the second emission surface region is higher than the formation density of the fluorescence member in the first emission surface region. If comprised in this way, it can suppress effectively that a brightness nonuniformity arises in illumination light.
  • the fluorescent member in the second emission surface region with respect to the formation area of the fluorescent member in the first emission surface region area when viewed in plan from the side facing the emission surface of the light transmitting plate).
  • the formation area of the fluorescent member may be increased, or the thickness of the fluorescent member in the second emission surface region may be increased relative to the thickness (application amount) of the fluorescent member in the first emission surface region.
  • the emission surface of the light transmitting plate is not covered with the fluorescence member over the entire surface. It is preferable to be exposed. If comprised in this way, the fluorescent member in a 2nd output surface area
  • the formation density of can be increased.
  • the fluorescent member may be composed of a plurality of island-shaped portions, and the plurality of island-shaped portions may be arranged in a dispersed manner. As described above, if the plurality of island-shaped portions as the fluorescent member are arranged in a distributed manner, the fluorescent member in the second emission surface region can be easily formed with respect to the formation density of the fluorescent member in the first emission surface region. The position of the exposed portion of the exit surface of the light transmissive plate can be adjusted as appropriate so that the formation density is increased.
  • the outer size of the plurality of island portions may gradually increase as the distance from the exit surface region increases, and the dispersion interval of the plurality of island portions gradually decreases as the distance from the first exit surface region increases. Also good. If comprised in this way, the formation density of a fluorescent member will become high gradually as it leaves
  • the fluorescent member may be composed of a plurality of linear portions, and the plurality of linear portions may be arranged in a lattice shape. As described above, if the plurality of linear portions as the fluorescent member are arranged in a grid pattern, the fluorescent member in the second emission surface region can be easily formed with respect to the formation density of the fluorescent member in the first emission surface region. The position of the exposed portion of the exit surface of the light transmissive plate can be adjusted as appropriate so that the formation density is increased.
  • the line widths of the plurality of linear portions may gradually increase as the distance from the exit surface region increases, and the adjacent intervals of the plurality of linear portions gradually decrease as the distance from the first exit surface region increases. Also good. If comprised in this way, the formation density of a fluorescent member will become high gradually as it leaves
  • the display device includes the illumination device according to the first aspect and a display panel illuminated with light from the illumination device.
  • an illuminating device and a display device capable of suppressing the occurrence of luminance unevenness in illumination light.
  • FIG. 1 It is a disassembled perspective view of the liquid crystal display device (display device) provided with the backlight unit (illumination device) by 1st Embodiment of this invention.
  • the top view (the fluorescent member formed on the output surface of a diffuser plate) when the diffuser plate (light-transmitting plate) of the backlight unit by 1st Embodiment of this invention is seen planarly from the side facing an output surface FIG.
  • FIG. It is a figure showing the formation state of the fluorescent member formed on the output surface of the diffusion plate of the backlight unit by 1st Embodiment of this invention.
  • This display device is a liquid crystal display device, and as shown in FIG. 1, is installed on a liquid crystal display panel (illuminated body) 10 for displaying an image and a back surface side opposite to the display surface side of the liquid crystal display panel 10.
  • the backlight unit 20 is provided at least.
  • the liquid crystal display panel 10 is an example of the “display panel” in the present invention
  • the backlight unit 20 is an example of the “illuminating device” in the present invention.
  • the liquid crystal display panel 10 has a display area where an image is actually displayed and a non-display area which is an outer edge area of the display area. A plurality of pixels arranged in a matrix are formed in the display area of the liquid crystal display panel 10.
  • Each of the plurality of pixels is driven by a switching element, a pixel electrode, a common electrode, and the like. Note that the switching element, the pixel electrode, and the common electrode are not shown in order to make the drawing easy to see, and wirings that are electrically connected to them are not shown.
  • the switching element is made of a TFT (thin film transistor), the gate of the switching element is connected to a gate line (scanning line), and the source of the switching element is connected to a source line (data line).
  • a pixel electrode is connected to the drain of the switching element, a common electrode is disposed so as to face the pixel electrode, and a liquid crystal (not shown) is sandwiched between the pixel electrode and the common electrode.
  • the switching elements are individually provided for each pixel, and the pixel electrodes are also individually provided for each pixel.
  • the common electrode is common to each pixel.
  • the backlight unit 20 employs a direct type system, emits white backlight light (illumination light) in a planar shape, and uniformly illuminates the back surface of the liquid crystal display panel 10 with the backlight light. It is supposed to be.
  • the optical property (light transmittance) of the liquid crystal is changed for each pixel based on the video signal. Specifically, in each pixel, an electric field is generated between the pixel electrode and the common electrode by supplying predetermined power to the pixel electrode via the switching element. The orientation of the liquid crystal, that is, the transmittance of light transmitted through the liquid crystal is changed by the electric field generated between the pixel electrode and the common electrode.
  • the transmission amount of the backlight light transmitted through the liquid crystal display panel 10 is different for each pixel. As a result, a desired image is displayed on the display surface of the liquid crystal display panel 10.
  • the liquid crystal display panel 10 includes at least two transparent substrates 11 and 12.
  • One transparent substrate 11 is referred to as an active matrix substrate, and the other transparent substrate 12 may be referred to as a counter substrate because it is disposed opposite to the transparent substrate 11, or a color filter.
  • a switching element and a pixel electrode are formed, and a gate line (scanning line) and a source line (data line) electrically connected to them are also formed.
  • a common electrode is formed on a predetermined surface of the other transparent substrate 12.
  • a color filter is further formed on the predetermined surface of the other transparent substrate 12 as necessary.
  • Each predetermined surface of the two transparent electrodes 11 and 12 is covered with an alignment film (not shown) capable of aligning the liquid crystal in a specific direction.
  • the two transparent substrates 11 and 12 are bonded to each other via a seal material (not shown) so that their predetermined surfaces face each other.
  • a liquid crystal is sealed between the two transparent substrates 11 and 12.
  • the liquid crystal is sandwiched between the pixel electrode and the common electrode (between the alignment film covering the predetermined surface of one transparent substrate 11 and the alignment film covering the predetermined surface of the other transparent electrode 12). ing.
  • the outer sizes of the two transparent substrates 11 and 12 are different from each other, and the outer size of the transparent substrate 11 is larger than the outer size of the transparent substrate 12. Accordingly, the two transparent substrates 11 and 12 are bonded to each other, but the predetermined ends of the transparent substrates 11 and 12 do not match each other, and a part of the predetermined surface of the transparent substrate 11 is separated from the transparent substrate 12. Exposed. The exposed portion of the predetermined surface of the transparent substrate 11 is a region of a non-display area, and is used for electrically connecting a driver (not shown) to the transparent substrate 11.
  • a polarizing sheet 13 that transmits only light waves in a specific vibration direction is attached to each of the surfaces of the two transparent substrates 11 and 12 opposite to the predetermined surfaces (surfaces on the liquid crystal side). Yes.
  • the transmission axis directions of the two polarizing sheets 13 are shifted from each other by about 90 °.
  • the backlight unit 20 installed on the back side of the liquid crystal display panel 10 includes at least a back chassis 21, a light source module 22, a reflection sheet 23, a diffusion plate 24, and an optical sheet 25.
  • the diffuser plate 24 is an example of the “translucent plate” in the present invention.
  • the back chassis 21 is formed in a substantially box shape with the liquid crystal display panel 10 side opened. That is, the back chassis 21 has a bottom portion 21a having a substantially rectangular shape in plan view (when viewed from the liquid crystal display panel 10 side), and a side portion 21b standing on the outer periphery of the bottom portion 21a. Yes. And the area
  • a plurality of light source modules 22 are housed in the housing area of the back chassis 21 and are fixed to the bottom 21 a of the back chassis 21. In a state where the backlight unit 20 is installed on the back side of the liquid crystal display panel 10, the light source module 22 is disposed immediately below the liquid crystal display panel 10 (region facing the back side of the liquid crystal display panel 10).
  • the light source module 22 has a structure in which two or more LED packages 26 each emitting ultraviolet light are used as light sources, and the two or more LED packages 26 are formed on a mounting surface of the same LED substrate 27 formed in a strip shape. It has been installed.
  • the peak wavelength of ultraviolet rays emitted from two or more LED packages 26 is 400 nm or less (for example, about 210 nm to 400 nm).
  • the two or more LED packages 26 are arranged in a line along the longitudinal direction of the LED substrate 27 and are connected in series. Note that the number of LED packages 26 to be mounted on the mounting surface of the same LED substrate 27 is not particularly limited, and can be changed according to the application.
  • the plurality of light source modules 22 are accommodated in the accommodation area of the back chassis 21, but the plurality of light source modules 22 are parallel to the bottom surface of the bottom portion 21 a of the back chassis 21. They are two-dimensionally arranged at predetermined intervals in the X direction (longitudinal direction of the back chassis 21) and the Y direction (short direction of the back chassis 21). In this state, the longitudinal direction of the LED board 27 and the X direction coincide with each other, and the short side direction of the LED board 27 and the Y direction coincide with each other.
  • the light source modules 22 adjacent in the X direction are electrically connected to each other via a connector (not shown).
  • the LED boards 27 included in each of the one light source module 22 and the other light source module 22 adjacent in the X direction are electrically connected to each other via the connector.
  • the reflection sheet 23 is for reflecting the ultraviolet rays emitted from the LED package 26 toward the liquid crystal display panel 10, and is housed in the housing area of the back chassis 21 together with the light source module 22.
  • the shape of the reflection sheet 23 includes a bottom portion 23a having a substantially rectangular shape in plan view, and an obliquely inclined side portion 23b standing on the outer periphery of the bottom portion 23a.
  • the bottom 23 a of the reflection sheet 23 is placed on the bottom surface of the bottom 21 a of the back chassis 21 with the LED substrate 27 interposed therebetween. That is, the bottom portion 23 a of the reflection sheet 23 covers the mounting surface of the LED substrate 27 (including the surface of the bottom surface 21 a of the back chassis 21 that does not overlap the LED substrate 27).
  • the side portion 23 b of the reflection sheet 23 covers the inner side surface of the side portion 21 b of the back chassis 21.
  • the LED package 26 mounted on the LED substrate 27 is also covered with the bottom portion 23 a of the reflection sheet 23. Accordingly, the same number of exposure holes 23c having circular openings are formed in the bottom 23a of the reflection sheet 23 so that the LED package 26 is exposed to the liquid crystal display panel 10 side. One LED package 26 is exposed (projected) to the liquid crystal display panel 10 side from each of the exposed holes 23 c of the reflection sheet 23.
  • the diffusion plate 24 is for introducing ultraviolet rays emitted from the LED package 26 and diffusing and emitting the ultraviolet rays toward the liquid crystal display panel 10 side.
  • the diffusion plate 24 has a substantially rectangular front surface and a rear surface opposite to the front surface. And a plurality of side surfaces connected to the rear surface.
  • the diffusion plate 24 is disposed so as to close the opening of the back chassis 21, the front surface of the diffusion plate 24 is directed toward the liquid crystal display panel 10, and the rear surface of the diffusion plate 24 is directed toward the bottom 21 a side of the back chassis 21. It is in the state that was. That is, the light source module 22 is covered by the diffusion plate 24 from the liquid crystal display panel 10 side.
  • the ultraviolet rays are introduced into the diffusion plate 24 from the rear surface of the diffusion plate 24.
  • the ultraviolet rays introduced into the diffusion plate 24 are diffused and emitted from the front surface of the diffusion plate 24 toward the liquid crystal display panel 10 side.
  • the front surface of the diffusion plate 24 is referred to as an emission surface 24a.
  • the constituent material of the diffusion plate 24 is not particularly limited, and for example, an acrylic resin or a vinyl resin can be considered. Further, the shape and thickness of the diffusion plate 24 are not particularly limited, and can be changed according to the application.
  • the optical sheet 25 is a sheet group including a diffusion sheet, a lens sheet, and the like, and is disposed on the emission surface 24 a of the diffusion plate 24.
  • the type and the number of sheets used of the optical sheet 25 are appropriately changed according to the application.
  • a fluorescent member 28 (see FIG. 2) is formed on the emission surface 24a of the diffusion plate 24. For this reason, the fluorescent member 28 is actually sandwiched between the diffusion plate 24 and the optical sheet 25. In other words, the optical sheet 25 is disposed on the emission surface 24 a of the diffusion plate 24 via the fluorescent member 28.
  • the emission surface 24 a of the diffusion plate 24 by applying a fluorescent member 28 that absorbs ultraviolet rays and emits white light to the emission surface 24 a of the diffusion plate 24, the emission surface 24 a of the diffusion plate 24.
  • the fluorescent member 28 is formed on the top. For this reason, although ultraviolet rays are emitted from the emission surface 24 a of the diffusion plate 24, the ultraviolet rays are converted into white light by the fluorescent member 28. Therefore, white light is incident on the optical sheet 25 (see FIG. 1), and the white light diffused (collected) by the optical sheet 25 illuminates the back surface of the liquid crystal display panel 10 (see FIG. 1).
  • the fluorescent member 28 formed on the emission surface 24a of the diffusion plate 24 for example, a phosphor that absorbs ultraviolet rays and converts them into red light, a phosphor that absorbs ultraviolet rays and converts it into green light, and absorbs ultraviolet rays.
  • the phosphor contains three types of phosphors that convert blue light. Thereby, if each phosphor contained in the fluorescent member 28 is excited by ultraviolet rays and emits light, they are mixed and become white, so that the fluorescent member 28 emits white light.
  • the fluorescent member 28 may include any number of phosphors.
  • the amount of ultraviolet light emitted from the light exit surface 24a of the diffusion plate 24 per unit area is not uniform over the entire surface, and varies depending on the light output position. That is, as shown in FIG. 3, the vicinity area 26 a of the LED package 26 in the plan view (when viewed in a plan view from the side facing the emission surface 24 a of the diffusion plate 24) of the emission surface 24 a of the diffusion plate 24.
  • the amount of ultraviolet light emitted per unit area from a predetermined overlapping exit surface region is an exit surface region other than the predetermined exit surface region (“ It corresponds to the amount of the emitted light per unit area of the ultraviolet light from the “second emission surface area”.
  • the amount of ultraviolet light emitted per unit area other than the predetermined emission surface area gradually decreases as the distance from the predetermined emission surface area increases.
  • a predetermined emission surface region having the largest ultraviolet ray emission amount among the emission surfaces 24a of the diffusion plate 24 is referred to as a first emission surface region, and the ultraviolet ray emission amount is larger than that of the predetermined emission surface region.
  • a small number of other exit surface regions are referred to as second exit surface regions to be distinguished.
  • the formation density of the fluorescent member 28 in the second emission surface region is set higher than the formation density of the fluorescent member 28 in the first emission surface region. Furthermore, the formation density of the fluorescent members 28 in the second emission surface area is gradually increased as the distance from the first emission surface area increases. By doing so, the difference between the amount of ultraviolet light per unit area incident on the fluorescent member 28 in the first emission surface area and the amount of ultraviolet light per unit area incident on the fluorescent member 28 in the second emission surface area. Is made smaller. In other words, the difference between the light emission amount per unit area in the first emission surface region and the light emission amount per unit area in the second emission surface region is reduced.
  • the entire emission surface 24a of the diffusion plate 24 is covered with the fluorescent member 28. No. That is, the fluorescent member 28 is not uniformly formed on the entire emission surface 24a of the diffusion plate 24, and the emission surface 24a of the diffusion plate 24 is partially exposed.
  • the fluorescent member 28 is composed of a plurality of island-shaped portions 28a each formed in a substantially circular shape. Then, the plurality of island portions 28a are dispersed so as to be separated from each other so that the formation density of the fluorescent members 28 in the second emission surface area is higher than the formation density of the fluorescence members 28 in the first emission surface area. Is arranged. Further, the outer shape size (diameter) D of the plurality of island-shaped portions 28a gradually increases as the distance from the first emission surface region increases so that the formation density of the fluorescent members 28 gradually increases as the distance from the first emission surface region increases. It has been enlarged. Note that the outer size D of the plurality of island-shaped portions 28a included in the fluorescent member 28 can be changed as appropriate according to the use and the like as long as it gradually increases with distance from the first emission surface area.
  • the LED package 26 that emits ultraviolet rays is used as the light source, and the fluorescent member 28 that emits light by absorbing the ultraviolet rays is formed on the emission surface 24a of the diffusion plate 24, thereby diffusing the plate 24. Since the ultraviolet rays emitted from the emission surface 24a enter the fluorescent member 28, the fluorescent member 28 is excited to emit white light, and the white light emitted from the fluorescent member 28 becomes the basis of the backlight light. In this case, since the white light emitted from the fluorescent member 28 spreads in all directions, it is assumed that the backlight unit 20 is thinned by reducing the distance between the diffusion plate 24 and the LED package 26. However, it is possible to suppress the occurrence of luminance unevenness in the backlight light.
  • the amount of ultraviolet rays emitted per unit area differs depending on the emission position of the emission surface 24a of the diffusion plate 24 (the amount of emitted ultraviolet light per unit area in the first emission surface region is the second emission amount).
  • the amount of ultraviolet light emitted per unit area in the surface area is larger), which lowers the formation density of the fluorescent member 28 in the first emission surface area and increases the formation density of the fluorescent member 28 in the second emission surface area. Therefore, the difference between the amount of ultraviolet light per unit area incident on the fluorescent member 28 in the first emission surface area and the amount of ultraviolet light per unit area incident on the fluorescent member 28 in the second emission surface area (first emission surface).
  • the difference between the light emission amount per unit area in the surface area and the light emission amount per unit area in the second emission surface area) is reduced. Thereby, even if the amount of ultraviolet rays emitted per unit area differs depending on the emission position of the emission surface 24a of the diffusing plate 24, luminance unevenness generated in the backlight light is effectively suppressed.
  • the exit surface 24a of the diffuser plate 24 is partially exposed without being covered with the fluorescent member 28 over the entire surface, so that the exit surface 24a of the diffuser plate 24 is exposed. If the position of the exposed portion is appropriately adjusted, the formation density of the fluorescent member 28 in the second emission surface area can be easily increased with respect to the formation density of the fluorescence member 28 in the first emission surface area.
  • the formation density of the fluorescent members 28 in the first emission surface region can be easily determined.
  • the position of the exposed portion of the exit surface 24a of the diffusion plate 24 can be adjusted as appropriate so that the formation density of the fluorescent members 28 in the second exit surface region is increased.
  • the outer size D of the plurality of island-shaped portions 28a as the fluorescent member 28 is gradually increased as the distance from the first emission surface region is increased, the formation density of the fluorescent member 28 is first. It gradually increases as the distance from the exit surface area increases. Therefore, even if the emission amount per unit area of the ultraviolet rays gradually decreases as the distance from the first emission surface region increases, it is possible to effectively suppress the occurrence of luminance unevenness in the backlight light.
  • the optical sheet 25 is disposed on the emission surface 24a of the diffusion plate 24 via the fluorescent member 28, thereby diffusing white light emitted from the fluorescent member 28. It can be condensed. Thereby, better backlight light can be obtained.
  • the light diffusing effect is improved by forming the fluorescent member 28 on the emission surface 24a of the diffusing plate 24 instead of a mere transparent plate having no light diffusing function. Further, it is possible to further suppress the occurrence of luminance unevenness in the backlight light.
  • the outer shape of the plurality of island portions 28a as the fluorescent member 28 may be changed.
  • the outer shape of the plurality of island-shaped portions 28a as the fluorescent member 28 may be a quadrangular shape (including a substantially quadrangular shape) or a triangular shape (including a substantially triangular shape), and may have other shapes. May be.
  • a simple transparent plate having no light diffusion function may be used instead of the diffusion plate 24. That is, the fluorescent member 28 may be formed on a simple transparent plate having no light diffusion function.
  • the transparent plate corresponds to the “translucent plate” of the present invention.
  • the fluorescent member 28 is formed on the emission surface 24a of the diffusion plate 24, and the fluorescent member 28 includes a plurality of islands. It consists of the shape part 28a. Further, the plurality of island portions 28a as the fluorescent member 28 are separated from each other so that the formation density of the fluorescent member 28 in the second emission surface region is higher than the formation density of the fluorescent member 28 in the first emission surface region. Are so distributed.
  • the plurality of island portions 28a as the fluorescent member 28 have substantially the same outer size.
  • interval G of the some island-shaped part 28a is made small gradually as it leaves
  • interval G of the some island-shaped part 28a contained in the fluorescent member 28 if it becomes small gradually as it leaves
  • the other configuration of the second embodiment is the same as the configuration of the first embodiment, and a detailed description thereof will be omitted.
  • the formation density of the fluorescent member 28 is reduced by gradually decreasing the dispersion interval G of the plurality of island-like portions 28a as the fluorescent member 28 as the distance from the first emission surface region increases.
  • the distance gradually increases as the distance from the first exit surface area increases.
  • the dispersion interval of the plurality of island-shaped portions 28a as the fluorescent member 28 is gradually reduced as the distance from the first emission surface region increases, and the plurality of island-shaped as the fluorescent member 28 is formed.
  • the outer size of the portion 28a may be gradually increased as the distance from the first exit surface area increases. That is, the configuration of the first embodiment may be combined with the configuration of the second embodiment.
  • a fluorescent member 38 made of the same material as that of the fluorescent member 28 of the first embodiment is formed on the emission surface 24 a of the diffusion plate 24. Includes a plurality of linear portions 38a.
  • FIG. 5 is not a cross-sectional view, hatching is applied to a portion corresponding to the fluorescent member 38 in order to make the drawing easy to see.
  • the formation density of the fluorescent member 38 in the second emission surface area is higher than the formation density of the fluorescent member 38 in the first emission surface area, and the formation density of the fluorescent member 38 is separated from the first emission surface area. Therefore, the plurality of linear portions 38a are arranged in a lattice pattern so as to gradually increase. More specifically, the line width W of the plurality of linear portions 38a as the fluorescent member 38 is gradually increased as the distance from the first emission surface area increases. Note that the line width W of the plurality of linear portions 38a included in the fluorescent member 38 can be changed as appropriate depending on the application and the like as long as it gradually increases as the distance from the first emission surface region increases.
  • the fluorescent member 38 composed of a plurality of linear portions 38a is formed on the emission surface 24a of the diffusion plate 24, and the plurality of linear portions 38a are arranged in a lattice pattern, Further, by gradually increasing the line width W of the plurality of linear portions 38a as the distance from the first emission surface area increases, the formation density of the fluorescent member 38 gradually increases as the distance from the first emission surface area increases. As a result, as in the first embodiment, even if the emission amount per unit area of ultraviolet light gradually decreases as the distance from the first emission surface region increases, it is effective to cause uneven brightness in the backlight light. Can be suppressed.
  • the fluorescent member 38 is formed on the emission surface 24a of the diffuser plate 24, and the fluorescent member 38 includes a plurality of lines. It consists of the shape part 38a.
  • the formation density of the fluorescent member 38 in the second emission surface region is higher than the formation density of the fluorescence member 38 in the first emission surface region, and the formation density of the fluorescence member 38 is separated from the first emission surface region. Therefore, the plurality of linear portions 38a are arranged in a lattice pattern so as to gradually increase.
  • FIG. 6 is not a cross-sectional view, a portion corresponding to the fluorescent member 38 is hatched to make the drawing easy to see.
  • the line widths of the plurality of linear portions 38a as the fluorescent member 38 are substantially the same.
  • the adjacent spacing G of the plurality of linear portions 38a is gradually decreased as the distance from the first emission surface area is increased so that the formation density of the fluorescent member 38 gradually increases as the distance from the first emission surface area increases. Yes.
  • the adjacent gap G between the plurality of linear portions 38a included in the fluorescent member 38 can be appropriately changed depending on the application and the like as long as it gradually decreases as the distance from the first emission surface region increases.
  • the fluorescent member 38 composed of a plurality of linear portions 38a is formed on the emission surface 24a of the diffusion plate 24, and the plurality of linear portions 38a are arranged in a lattice pattern,
  • the formation density of the fluorescent member 38 gradually increases as the distance from the first emission surface area increases.
  • the interval between the plurality of linear portions 38a as the fluorescent member 38 is gradually reduced as the distance from the first emission surface region increases, and the plurality of linear shapes as the fluorescent member 38 is used.
  • the line width of the portion 38a may be gradually increased as the distance from the first exit surface area increases. That is, the configuration of the third embodiment may be combined with the configuration of the fourth embodiment.
  • a fluorescent member 48 made of the same material as that of the fluorescent member 28 of the first embodiment is formed on the emission surface 24a of the diffusion plate 24.
  • Reference numeral 48 covers substantially the entire exit surface 24 a of the diffusion plate 24.
  • the other configuration of the fifth embodiment is the same as the configuration of the first embodiment, and a detailed description thereof will be omitted.
  • the amount of the fluorescent member 48 applied to the emission surface 24a of the diffusion plate 24 is adjusted (in the second emission surface region with respect to the thickness of the fluorescence member 48 in the first emission surface region). By increasing the thickness of the fluorescent member 48, the same effect as in the first embodiment can be obtained.
  • the backlight unit 50 installed on the back side of the liquid crystal display panel 10 is an edge light type.
  • the edge light type backlight unit 50 includes at least a light guide plate 51, a light source module 52, and an optical sheet 53.
  • the light guide plate 51 is an example of the “translucent plate” in the present invention.
  • the light guide plate 51 has a front surface and a rear surface opposite to the front surface, and a plurality of side end surfaces connected to the front surface and the rear surface, and is arranged so that the front surface faces the liquid crystal display panel 10 side.
  • the light source module 52 has an LED package 54 that emits ultraviolet rays as a light source, and the LED package 54 is mounted on the mounting surface of the LED substrate 55. And the light source module 52 is arrange
  • the ultraviolet rays when ultraviolet rays are emitted from the LED package 54, the ultraviolet rays enter the predetermined side end surface of the light guide plate 51 and are introduced into the light guide plate 51. Thereafter, the ultraviolet light introduced into the light guide plate 51 is emitted from the front surface of the light guide plate 51 toward the liquid crystal display panel 10.
  • the front surface of the light guide plate 51 is referred to as an emission surface 51a.
  • the optical sheet 53 is a group of sheets including a diffusion sheet, a lens sheet, and the like, and is disposed on the emission surface 51 a of the light guide plate 51.
  • the type and the number of sheets used of the optical sheet 53 are appropriately changed according to the application.
  • the fluorescent member 56 is formed on the emission surface 51a of the light guide plate 51 (the fluorescent member 56 is sandwiched between the light guide plate 51 and the optical sheet 53).
  • the fluorescent member 56 is made of the same material as the fluorescent member 28 of the first embodiment, and absorbs ultraviolet rays to emit white light. For this reason, although ultraviolet rays are emitted from the emission surface 51 a of the light guide plate 51, the ultraviolet rays are converted into white light by the fluorescent member 56. Therefore, white light is incident on the optical sheet 53, and the white light diffused (condensed) by the optical sheet 53 illuminates the back surface of the liquid crystal display panel 10.
  • the present invention is not limited thereto, and the lighting device installed in a display device other than the liquid crystal display device is used.
  • the present invention may be applied.
  • Liquid crystal display panel (display panel) 20, 50 Backlight unit (lighting device) 24 Diffuser (Translucent plate) 24a, 51a Emitting surface 26, 54 LED package (light source) 28, 38, 48, 56 Fluorescent member 28a Island portion 38a Linear portion 51 Light guide plate (translucent plate)

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Abstract

Provided is a lighting device which is capable of suppressing occurrence of luminance unevenness in illumination light. This lighting device comprises: an LED package (26) that emits ultraviolet light; and a diffusion plate (24) that has an exit surface (24a) and discharges the ultraviolet light, which is emitted by the LED package (26) and entered into the diffusion plate (24), from the exit surface (24a). A fluorescent member (28) which absorbs ultraviolet light and emits light is formed on the exit surface (24a).

Description

照明装置および表示装置Illumination device and display device
　本発明は、照明装置および表示装置に関する。 The present invention relates to a lighting device and a display device.
　表示装置の一つである液晶表示装置では、映像を表示する液晶表示パネルが非発光であるため、液晶表示パネルの裏面側（液晶表示パネルの表示面側とは反対側）に照明装置を設置し、その照明装置からの光で液晶表示パネルを照明するようになっている。なお、液晶表示パネルの裏面側に設置される照明装置は、たとえば、バックライトユニットなどと称されている。 In a liquid crystal display device that is one of the display devices, the liquid crystal display panel that displays images does not emit light, so an illumination device is installed on the back side of the liquid crystal display panel (the side opposite to the display surface side of the liquid crystal display panel) The liquid crystal display panel is illuminated with light from the illumination device. In addition, the illuminating device installed in the back surface side of a liquid crystal display panel is called the backlight unit etc., for example.
　バックライトユニットに使用する光源としては、水銀やキセノンを蛍光管の内部に封入した冷陰極蛍光ランプが知られている。しかし、冷陰極蛍光ランプをバックライトユニットの光源とした場合、発光輝度や寿命が不十分となり、さらに、低圧側の輝度が低くなることで均整のとれた発光が得られ難くなるという不都合があった。 As a light source used in the backlight unit, a cold cathode fluorescent lamp in which mercury or xenon is enclosed in a fluorescent tube is known. However, when the cold cathode fluorescent lamp is used as the light source of the backlight unit, there are disadvantages that the light emission luminance and life are insufficient, and that the luminance on the low-pressure side is low, making it difficult to obtain a uniform light emission. It was.
　そこで、このような不都合を解消するために、冷陰極蛍光ランプに代えて、ＬＥＤ（発光ダイオード）パッケージを光源としたバックライトユニットが提案されている。バックライトユニットに使用する光源をＬＥＤパッケージとすると、上述した不都合が解消されることに加えて、低消費電力化が容易に図られ、環境負荷の低減も実現できる。 Therefore, in order to eliminate such inconvenience, a backlight unit using an LED (light emitting diode) package as a light source has been proposed in place of the cold cathode fluorescent lamp. When the light source used for the backlight unit is an LED package, in addition to eliminating the above-described disadvantages, it is possible to easily reduce power consumption and to reduce the environmental load.
　また、バックライトユニットは、大別するとエッジライト型方式と直下型方式との２つに分類される。 Also, the backlight unit is roughly classified into two types, an edge light type and a direct type.
　エッジライト型のバックライトユニットは、液晶表示パネルの直下（液晶表示パネルの裏面と対向する領域）に導光板を配置し、その導光板の所定の側端面と対向するように光源を配置したものである。このエッジライト型のバックライトユニットでは、光源から光が発せられると、光源からの光が導光板の所定の側端面を介して導光板内に導入される。そして、導光板内に導入された光が導光板の前面（液晶表示パネル側に向けられた面）から出射されることで液晶表示パネルが照明される。 An edge-light type backlight unit has a light guide plate arranged directly under a liquid crystal display panel (a region facing the back surface of the liquid crystal display panel), and a light source arranged so as to face a predetermined side end surface of the light guide plate. It is. In the edge light type backlight unit, when light is emitted from the light source, the light from the light source is introduced into the light guide plate through a predetermined side end surface of the light guide plate. Then, the light introduced into the light guide plate is emitted from the front surface of the light guide plate (the surface directed to the liquid crystal display panel side) to illuminate the liquid crystal display panel.
　一方、直下型のバックライトユニットは、液晶表示パネルの直下に光源を配置したものである。このような直下型のバックライトユニットは、大面積を高出力で照明するのに有利であって、大型サイズの液晶表示装置に使用されることが多い。 On the other hand, the direct type backlight unit has a light source arranged directly under the liquid crystal display panel. Such a direct type backlight unit is advantageous for illuminating a large area with high output, and is often used for a large-sized liquid crystal display device.
　ところで、ＬＥＤパッケージを光源とする直下型のバックライトユニットにおいては、ＬＥＤパッケージから発せられた光を拡散板で拡散するのが一般的である（たとえば、特許文献１参照）。 By the way, in a direct type backlight unit using an LED package as a light source, light emitted from the LED package is generally diffused by a diffusion plate (see, for example, Patent Document 1).
　一例として、図９に示すように、通常はＬＥＤパッケージ１０１が基板１０２の搭載面上に搭載されるので、その基板１０２の搭載面に対して所定の間隔を隔てて対向するように拡散板１０３を配置している。これにより、ＬＥＤパッケージ１０１から発せられた光は、拡散板１０３に入射して拡散板１０３内に導入された後、拡散板１０３から拡散出射されて液晶表示パネル（図示せず）を照明することになる。 As an example, as shown in FIG. 9, the LED package 101 is normally mounted on the mounting surface of the substrate 102, so that the diffusion plate 103 is opposed to the mounting surface of the substrate 102 with a predetermined interval. Is arranged. Thereby, the light emitted from the LED package 101 enters the diffusion plate 103 and is introduced into the diffusion plate 103, and then diffused and emitted from the diffusion plate 103 to illuminate a liquid crystal display panel (not shown). become.
特開２００８－１４０６４６号公報JP 2008-140646 A
　しかしながら、図９に示した従来のバックライトユニットでは、ＬＥＤパッケージ１０１と拡散板１０３との間の距離を小さくすることでバックライトユニットの薄型化を図ろうとすると、図９中の領域１００ａ（ＬＥＤパッケージ１０１と重畳する領域）よりも領域１００ｂ（隣接するＬＥＤパッケージ１０１間の間隙と重畳する領域）が暗くなってしまい、照明光に輝度ムラが発生するという不都合が生じる。 However, in the conventional backlight unit shown in FIG. 9, when it is attempted to reduce the thickness of the backlight unit by reducing the distance between the LED package 101 and the diffusion plate 103, the region 100a (LED in FIG. The region 100b (region overlapping with the gap between adjacent LED packages 101) becomes darker than the region overlapping with the package 101), resulting in inconvenience that luminance unevenness occurs in the illumination light.
　なお、隣接するＬＥＤパッケージ１０１間の間隙が大きい場合にも、図９中の領域１００ａよりも領域１００ｂが暗くなってしまい、照明光に輝度ムラが発生する。 Even when the gap between the adjacent LED packages 101 is large, the region 100b becomes darker than the region 100a in FIG. 9, and luminance unevenness occurs in the illumination light.
　本発明は、上記課題を解決するためになされたものであり、照明光に輝度ムラが発生するのを抑制することが可能な照明装置および表示装置を提供することを目的とする。 This invention was made in order to solve the said subject, and it aims at providing the illuminating device and display apparatus which can suppress that the brightness nonuniformity generate | occur | produces in illumination light.
　上記目的を達成するために、本発明の第１の局面による照明装置は、紫外線を発する光源と、被照明体側に向く出射面を有し、光源から発せられた紫外線を導入して出射面から出射する透光板とを備えている。そして、紫外線を吸収して発光する蛍光部材が透光板の出射面上に形成されている。 In order to achieve the above object, an illumination device according to a first aspect of the present invention has a light source that emits ultraviolet rays and an emission surface that faces the illuminated body side, and introduces ultraviolet rays emitted from the light source to emit light from the emission surface. And a translucent plate that emits light. And the fluorescent member which absorbs an ultraviolet-ray and light-emits is formed on the output surface of a translucent board.
　第１の局面による照明装置では、上記のように構成することによって、透光板の出射面から出射された紫外線が蛍光部材に入射するので、蛍光部材が励起されて発光し、その蛍光部材から発せられる光が照明光の基となる。そして、このようにすると、蛍光部材から発せられる光は四方八方に広がるので、照明光に輝度ムラが生じてしまうのを抑制することが可能となる。 In the illuminating device according to the first aspect, since the ultraviolet ray emitted from the emission surface of the translucent plate is incident on the fluorescent member by being configured as described above, the fluorescent member is excited to emit light, and from the fluorescent member The emitted light becomes the basis of the illumination light. And if it does in this way, since the light emitted from a fluorescent member will spread in all directions, it will become possible to suppress that a brightness nonuniformity arises in illumination light.
　さらに、透光板の出射面の出射位置によって単位面積当たりの紫外線の出射量が異なってしまう（たとえば、透光板の出射面のうち、第１出射面領域における紫外線の単位面積当たりの出射量が第２出射面領域における紫外線の単位面積当たりの出射量よりも多くなってしまう）場合には、第１出射面領域における蛍光部材の形成密度を低くし、第２出射面領域における蛍光部材の形成密度を高くしておけば、第１出射面領域において蛍光部材に入射する単位面積当たりの紫外線量と、第２出射面領域において蛍光部材に入射する単位面積当たりの紫外線量との差（第１出射面領域における単位面積当たりの発光量と、第２出射面領域における単位面積当たりの発光量との差）を小さくすることができる。これにより、透光板の出射面の出射位置によって単位面積当たりの紫外線の出射量が異なっていたとしても、照明光に生じる輝度ムラが効果的に抑制される。 Furthermore, the amount of ultraviolet light emitted per unit area varies depending on the emission position of the light emitting surface of the light transmitting plate (for example, the amount of ultraviolet light emitted per unit area in the first light emitting surface region of the light emitting surface of the light transmitting plate) Is larger than the amount of ultraviolet light emitted per unit area in the second emission surface area), the fluorescent member formation density in the first emission surface area is reduced, and the fluorescence member in the second emission surface area is reduced. If the formation density is increased, the difference between the amount of ultraviolet light per unit area incident on the fluorescent member in the first emission surface region and the amount of ultraviolet light per unit area incident on the fluorescent member in the second emission surface region (first The difference between the light emission amount per unit area in the one emission surface region and the light emission amount per unit area in the second emission surface region can be reduced. Thereby, even if the amount of ultraviolet rays emitted per unit area differs depending on the emission position of the emission surface of the translucent plate, luminance unevenness generated in the illumination light is effectively suppressed.
　第１の局面による照明装置において、紫外線で励起されて発光する複数種類の蛍光体を含むものが蛍光部材とされていることが好ましい。このように構成すれば、容易に、白色の照明光を得ることができる。 In the illumination device according to the first aspect, it is preferable that a fluorescent member that includes a plurality of types of phosphors that are excited by ultraviolet rays to emit light is used. If comprised in this way, white illumination light can be obtained easily.
　第１の局面による照明装置において、透光板の出射面のうち、第１出射面領域における紫外線の単位面積当たりの出射量が第２出射面領域における紫外線の単位面積当たりの出射量よりも多くなっている場合には、第１出射面領域における蛍光部材の形成密度に対して第２出射面領域における蛍光部材の形成密度が高くなっていることが好ましい。このように構成すれば、照明光に輝度ムラが生じるのを効果的に抑制することができる。なお、この場合には、第１出射面領域における蛍光部材の形成面積（透光板の出射面と対向する側から平面的に見た場合の面積）に対して第２出射面領域における蛍光部材の形成面積を大きくしてもよいし、第１出射面領域における蛍光部材の厚み（塗布量）に対して第２出射面領域における蛍光部材の厚みを大きくしてもよい。 In the illuminating device according to the first aspect, the amount of emitted ultraviolet light per unit area in the first emitting surface region out of the emitting surface of the translucent plate is larger than the amount of emitted ultraviolet light per unit area in the second emitting surface region. In this case, it is preferable that the formation density of the fluorescent member in the second emission surface region is higher than the formation density of the fluorescence member in the first emission surface region. If comprised in this way, it can suppress effectively that a brightness nonuniformity arises in illumination light. In this case, the fluorescent member in the second emission surface region with respect to the formation area of the fluorescent member in the first emission surface region (area when viewed in plan from the side facing the emission surface of the light transmitting plate). The formation area of the fluorescent member may be increased, or the thickness of the fluorescent member in the second emission surface region may be increased relative to the thickness (application amount) of the fluorescent member in the first emission surface region.
　第１出射面領域における蛍光部材の形成密度に対して第２出射面領域における蛍光部材の形成密度が高くなっている構成において、透光板の出射面が全面にわたって蛍光部材で覆われずに部分的に露出されていることが好ましい。このように構成すれば、透光板の出射面の露出部分の位置を適宜調整することにより、容易に、第１出射面領域における蛍光部材の形成密度に対して第２出射面領域における蛍光部材の形成密度を高くすることができる。 In the configuration in which the formation density of the fluorescent member in the second emission surface region is higher than the formation density of the fluorescence member in the first emission surface region, the emission surface of the light transmitting plate is not covered with the fluorescence member over the entire surface. It is preferable to be exposed. If comprised in this way, the fluorescent member in a 2nd output surface area | region will be easily with respect to the formation density of the fluorescent member in a 1st output surface area by adjusting the position of the exposed part of the output surface of a translucent board suitably. The formation density of can be increased.
　透光板の出射面が部分的に露出されている構成において、蛍光部材が複数の島状部からなっており、その複数の島状部が分散して配置されていてもよい。このように、蛍光部材としての複数の島状部を分散して配置するようにすれば、容易に、第１出射面領域における蛍光部材の形成密度に対して第２出射面領域における蛍光部材の形成密度が高くなるように、透光板の出射面の露出部分の位置を適宜調整することができる。 In the configuration in which the emission surface of the translucent plate is partially exposed, the fluorescent member may be composed of a plurality of island-shaped portions, and the plurality of island-shaped portions may be arranged in a dispersed manner. As described above, if the plurality of island-shaped portions as the fluorescent member are arranged in a distributed manner, the fluorescent member in the second emission surface region can be easily formed with respect to the formation density of the fluorescent member in the first emission surface region. The position of the exposed portion of the exit surface of the light transmissive plate can be adjusted as appropriate so that the formation density is increased.
　蛍光部材としての複数の島状部が分散して配置されている構成において、第１出射面領域から離れるにしたがって紫外線の単位面積当たりの出射量が徐々に少なくなっている場合には、第１出射面領域から離れるにしたがって複数の島状部の外形サイズが徐々に大きくなっていてもよいし、第１出射面領域から離れるにしたがって複数の島状部の分散間隔が徐々に小さくなっていてもよい。このように構成すれば、第１出射面領域から離れるにしたがって蛍光部材の形成密度が徐々に高くなる。すなわち、第１出射面領域から離れるにしたがって紫外線の単位面積当たりの出射量が徐々に少なくなっていたとしても、照明光に輝度ムラが生じるのを効果的に抑制することができる。 In a configuration in which a plurality of island-shaped parts as fluorescent members are arranged in a dispersed manner, when the emission amount per unit area of ultraviolet light gradually decreases as the distance from the first emission surface region increases, The outer size of the plurality of island portions may gradually increase as the distance from the exit surface region increases, and the dispersion interval of the plurality of island portions gradually decreases as the distance from the first exit surface region increases. Also good. If comprised in this way, the formation density of a fluorescent member will become high gradually as it leaves | separates from a 1st output surface area | region. That is, even when the amount of emitted light per unit area of ultraviolet rays gradually decreases as the distance from the first exit surface region increases, it is possible to effectively suppress the occurrence of uneven brightness in the illumination light.
　また、透光板の出射面が部分的に露出されている構成において、蛍光部材が複数の線状部からなっており、その複数の線状部が格子状に配置されていてもよい。このように、蛍光部材としての複数の線状部を格子状に配置するようにすれば、容易に、第１出射面領域における蛍光部材の形成密度に対して第２出射面領域における蛍光部材の形成密度が高くなるように、透光板の出射面の露出部分の位置を適宜調整することができる。 Further, in the configuration in which the emission surface of the translucent plate is partially exposed, the fluorescent member may be composed of a plurality of linear portions, and the plurality of linear portions may be arranged in a lattice shape. As described above, if the plurality of linear portions as the fluorescent member are arranged in a grid pattern, the fluorescent member in the second emission surface region can be easily formed with respect to the formation density of the fluorescent member in the first emission surface region. The position of the exposed portion of the exit surface of the light transmissive plate can be adjusted as appropriate so that the formation density is increased.
　蛍光部材としての複数の線状部が格子状に配置されている構成において、第１出射面領域から離れるにしたがって紫外線の単位面積当たりの出射量が徐々に少なくなっている場合には、第１出射面領域から離れるにしたがって複数の線状部の線幅が徐々に大きくなっていてもよいし、第１出射面領域から離れるにしたがって複数の線状部の隣接間隔が徐々に小さくなっていてもよい。このように構成すれば、第１出射面領域から離れるにしたがって蛍光部材の形成密度が徐々に高くなる。すなわち、第１出射面領域から離れるにしたがって紫外線の単位面積当たりの出射量が徐々に少なくなっていたとしても、照明光に輝度ムラが生じるのを効果的に抑制することができる。 In the configuration in which the plurality of linear portions as the fluorescent member are arranged in a lattice shape, when the emission amount per unit area of ultraviolet light gradually decreases as the distance from the first emission surface region increases, The line widths of the plurality of linear portions may gradually increase as the distance from the exit surface region increases, and the adjacent intervals of the plurality of linear portions gradually decrease as the distance from the first exit surface region increases. Also good. If comprised in this way, the formation density of a fluorescent member will become high gradually as it leaves | separates from a 1st output surface area | region. That is, even when the amount of emitted light per unit area of ultraviolet rays gradually decreases as the distance from the first exit surface region increases, it is possible to effectively suppress the occurrence of uneven brightness in the illumination light.
　第１出射面領域における蛍光部材の形成密度に対して第２出射面領域における蛍光部材の形成密度が高くなっている構成において、透光板の出射面が全面にわたって蛍光部材で覆われており、第１出射面領域における蛍光部材の厚みに対して第２出射面領域における蛍光部材の厚みが大きくなっていてもよい。このように構成すれば、容易に、第１出射面領域における蛍光部材の形成密度に対して第２出射面領域における蛍光部材の形成密度を高くすることができる。 In the configuration in which the formation density of the fluorescent member in the second emission surface region is higher than the formation density of the fluorescence member in the first emission surface region, the emission surface of the translucent plate is entirely covered with the fluorescence member, The thickness of the fluorescent member in the second emission surface region may be larger than the thickness of the fluorescent member in the first emission surface region. If comprised in this way, the formation density of the fluorescent member in a 2nd output surface area | region can be easily made high with respect to the formation density of the fluorescent member in a 1st output surface area | region.
　本発明の第２の局面による表示装置は、第１の局面による照明装置と、その照明装置からの光で照明される表示パネルとを備えている。 The display device according to the second aspect of the present invention includes the illumination device according to the first aspect and a display panel illuminated with light from the illumination device.
　このように構成された表示装置では、照明光に輝度ムラが生じてしまうのを抑制することが可能となる。 In the display device configured as described above, it is possible to suppress uneven brightness from occurring in the illumination light.
　以上のように、本発明によれば、照明光に輝度ムラが生じるのを抑制することが可能な照明装置および表示装置を得ることができる。 As described above, according to the present invention, it is possible to obtain an illuminating device and a display device capable of suppressing the occurrence of luminance unevenness in illumination light.
本発明の第１実施形態によるバックライトユニット（照明装置）を備えた液晶表示装置（表示装置）の分解斜視図である。It is a disassembled perspective view of the liquid crystal display device (display device) provided with the backlight unit (illumination device) by 1st Embodiment of this invention. 本発明の第１実施形態によるバックライトユニットの拡散板（透光板）を出射面と対向する側から平面的に見た場合の平面図（拡散板の出射面上に形成された蛍光部材の形成状態を表した図）である。The top view (the fluorescent member formed on the output surface of a diffuser plate) when the diffuser plate (light-transmitting plate) of the backlight unit by 1st Embodiment of this invention is seen planarly from the side facing an output surface FIG. 本発明の第１実施形態によるバックライトユニットの拡散板の出射面上に形成された蛍光部材の形成状態を表した図である。It is a figure showing the formation state of the fluorescent member formed on the output surface of the diffusion plate of the backlight unit by 1st Embodiment of this invention. 本発明の第２実施形態によるバックライトユニットの拡散板の出射面上に形成された蛍光部材の形成状態を表した図である。It is the figure showing the formation state of the fluorescent member formed on the output surface of the diffusion plate of the backlight unit by 2nd Embodiment of this invention. 本発明の第３実施形態によるバックライトユニットの拡散板の出射面上に形成された蛍光部材の形成状態を表した図である。It is a figure showing the formation state of the fluorescent member formed on the output surface of the diffusion plate of the backlight unit by 3rd Embodiment of this invention. 本発明の第４実施形態によるバックライトユニットの拡散板の出射面上に形成された蛍光部材の形成状態を表した図である。It is a figure showing the formation state of the fluorescent member formed on the output surface of the diffusion plate of the backlight unit by 4th Embodiment of this invention. 本発明の第５実施形態によるバックライトユニットの拡散板の出射面上に形成された蛍光部材の形成状態を表した図である。It is a figure showing the formation state of the fluorescent member formed on the output surface of the diffusion plate of the backlight unit by 5th Embodiment of this invention. 本発明の第６実施形態によるバックライトユニットの概略図である。It is the schematic of the backlight unit by 6th Embodiment of this invention. 従来のバックライトユニットの概略図である。It is the schematic of the conventional backlight unit.
　（第１実施形態）
　本発明の第１実施形態による照明装置を備えた表示装置の構成について、図１～図３を参照して説明する。 (First embodiment)
A configuration of a display device including the illumination device according to the first embodiment of the present invention will be described with reference to FIGS.
　この表示装置は液晶表示装置であって、図１に示すように、映像を表示する液晶表示パネル（被照明体）１０と、液晶表示パネル１０の表示面側とは反対の裏面側に設置されるバックライトユニット２０とを少なくとも備えている。なお、液晶表示パネル１０は、本発明の「表示パネル」の一例であり、バックライトユニット２０は、本発明の「照明装置」の一例である。 This display device is a liquid crystal display device, and as shown in FIG. 1, is installed on a liquid crystal display panel (illuminated body) 10 for displaying an image and a back surface side opposite to the display surface side of the liquid crystal display panel 10. The backlight unit 20 is provided at least. The liquid crystal display panel 10 is an example of the “display panel” in the present invention, and the backlight unit 20 is an example of the “illuminating device” in the present invention.
　液晶表示パネル１０は、実際に映像が表示される表示領域と、その表示領域の外縁領域である非表示領域とを有している。そして、液晶表示パネル１０の表示領域には、マトリクス状に配列された複数の画素が作り込まれている。 The liquid crystal display panel 10 has a display area where an image is actually displayed and a non-display area which is an outer edge area of the display area. A plurality of pixels arranged in a matrix are formed in the display area of the liquid crystal display panel 10.
　複数の画素のそれぞれは、スイッチング素子、画素電極および共通電極などによって駆動されるようになっている。なお、図面を見易くするため、スイッチング素子、画素電極および共通電極は図示しておらず、それらに対して電気的に接続される配線などについても図示していない。 Each of the plurality of pixels is driven by a switching element, a pixel electrode, a common electrode, and the like. Note that the switching element, the pixel electrode, and the common electrode are not shown in order to make the drawing easy to see, and wirings that are electrically connected to them are not shown.
　スイッチング素子はＴＦＴ（薄膜トランジスタ）からなっていて、スイッチング素子のゲートはゲート線（走査線）に接続され、スイッチング素子のソースはソース線（データ線）に接続される。また、スイッチング素子のドレインには画素電極が接続されるとともに、その画素電極と対向するように共通電極が配置され、さらに、画素電極と共通電極との間に液晶（図示せず）が挟持される。なお、スイッチング素子は各画素に個々に設けられており、画素電極も各画素に個々に設けられている。一方、共通電極については、その名の通り、各画素で共通となっている。 The switching element is made of a TFT (thin film transistor), the gate of the switching element is connected to a gate line (scanning line), and the source of the switching element is connected to a source line (data line). A pixel electrode is connected to the drain of the switching element, a common electrode is disposed so as to face the pixel electrode, and a liquid crystal (not shown) is sandwiched between the pixel electrode and the common electrode. The Note that the switching elements are individually provided for each pixel, and the pixel electrodes are also individually provided for each pixel. On the other hand, as the name indicates, the common electrode is common to each pixel.
　また、バックライトユニット２０は、直下型方式を採用したものであって、白色のバックライト光（照明光）を面状に出射し、そのバックライト光で液晶表示パネル１０の裏面をムラなく照明するようになっている。 Further, the backlight unit 20 employs a direct type system, emits white backlight light (illumination light) in a planar shape, and uniformly illuminates the back surface of the liquid crystal display panel 10 with the backlight light. It is supposed to be.
　そして、表示動作の際には、映像信号に基づいて、液晶の光学的性質（光透過率）が画素毎に変化される。具体的には、各画素において、スイッチング素子を介して画素電極に所定の電力が供給されることにより、画素電極と共通電極との間に電界が発生される。そして、画素電極と共通電極との間に発生した電界によって、液晶の配向、すなわち、液晶を透過する光の透過率が変化される。 In the display operation, the optical property (light transmittance) of the liquid crystal is changed for each pixel based on the video signal. Specifically, in each pixel, an electric field is generated between the pixel electrode and the common electrode by supplying predetermined power to the pixel electrode via the switching element. The orientation of the liquid crystal, that is, the transmittance of light transmitted through the liquid crystal is changed by the electric field generated between the pixel electrode and the common electrode.
　このため、バックライトユニット２０からのバックライト光によって液晶表示パネル１０の裏面が照明されると、液晶表示パネル１０を透過するバックライト光の透過量が画素毎に異ならされることになる。これにより、液晶表示パネル１０の表示面に所望の映像が表示される。 For this reason, when the back surface of the liquid crystal display panel 10 is illuminated by the backlight light from the backlight unit 20, the transmission amount of the backlight light transmitted through the liquid crystal display panel 10 is different for each pixel. As a result, a desired image is displayed on the display surface of the liquid crystal display panel 10.
　以下に、液晶表示パネル１０およびバックライトユニット２０の構成についてより詳細に説明する。 Hereinafter, the configuration of the liquid crystal display panel 10 and the backlight unit 20 will be described in more detail.
　液晶表示パネル１０は、２枚の透明基板１１および１２を少なくとも備えている。一方の透明基板１１は、アクティブマトリクス基板と称されるものであり、他方の透明基板１２は、透明基板１１に対して対向配置されることから対向基板と称される場合もあるし、カラーフィルタ基板と称される場合もある。 The liquid crystal display panel 10 includes at least two transparent substrates 11 and 12. One transparent substrate 11 is referred to as an active matrix substrate, and the other transparent substrate 12 may be referred to as a counter substrate because it is disposed opposite to the transparent substrate 11, or a color filter. Sometimes referred to as a substrate.
　一方の透明基板１１の所定面上には、スイッチング素子および画素電極が形成されているとともに、それらに電気的に接続されるゲート線（走査線）およびソース線（データ線）も形成されている。また、他方の透明基板１２の所定面上には、共通電極が形成されている。なお、他方の透明基板１２の所定面上には、共通電極に加えて、必要に応じてカラーフィルタがさらに形成される。そして、２枚の透明電極１１および１２のそれぞれの所定面は、液晶を特定方向に配向させることが可能な配向膜（図示せず）によって覆われている。 On a predetermined surface of one transparent substrate 11, a switching element and a pixel electrode are formed, and a gate line (scanning line) and a source line (data line) electrically connected to them are also formed. . A common electrode is formed on a predetermined surface of the other transparent substrate 12. In addition to the common electrode, a color filter is further formed on the predetermined surface of the other transparent substrate 12 as necessary. Each predetermined surface of the two transparent electrodes 11 and 12 is covered with an alignment film (not shown) capable of aligning the liquid crystal in a specific direction.
　また、２枚の透明基板１１および１２は、それぞれの所定面が向き合うように、シール材（図示せず）を介して互いに貼り合わされている。そして、２枚の透明基板１１および１２の間に液晶が封止されている。これによって、画素電極と共通電極との間（一方の透明基板１１の所定面を覆う配向膜と他方の透明電極１２の所定面を覆う配向膜との間）に液晶が挟持された状態となっている。 Also, the two transparent substrates 11 and 12 are bonded to each other via a seal material (not shown) so that their predetermined surfaces face each other. A liquid crystal is sealed between the two transparent substrates 11 and 12. As a result, the liquid crystal is sandwiched between the pixel electrode and the common electrode (between the alignment film covering the predetermined surface of one transparent substrate 11 and the alignment film covering the predetermined surface of the other transparent electrode 12). ing.
　さらに、２枚の透明基板１１および１２のそれぞれの外形サイズは互いに異ならされていて、透明基板１１の外形サイズが透明基板１２の外形サイズよりも大きくなっている。したがって、２枚の透明基板１１および１２は互いに貼り合わされているが、透明基板１１および１２のそれぞれの所定端は互いに合致しておらず、透明基板１１の所定面の一部が透明基板１２から露出されている。この透明基板１１の所定面の露出した部分は、非表示領域の一領域であって、透明基板１１にドライバ（図示せず）を電気的に接続するために用いられる。 Furthermore, the outer sizes of the two transparent substrates 11 and 12 are different from each other, and the outer size of the transparent substrate 11 is larger than the outer size of the transparent substrate 12. Accordingly, the two transparent substrates 11 and 12 are bonded to each other, but the predetermined ends of the transparent substrates 11 and 12 do not match each other, and a part of the predetermined surface of the transparent substrate 11 is separated from the transparent substrate 12. Exposed. The exposed portion of the predetermined surface of the transparent substrate 11 is a region of a non-display area, and is used for electrically connecting a driver (not shown) to the transparent substrate 11.
　また、２枚の透明基板１１および１２の所定面（液晶側の面）とは反対側の面のそれぞれには、特定の振動方向の光波だけを透過させる偏光シート１３が１枚ずつ貼付されている。そして、２枚の偏光シート１３のそれぞれの透過軸方向は、互いに約９０°ずらされている。 In addition, a polarizing sheet 13 that transmits only light waves in a specific vibration direction is attached to each of the surfaces of the two transparent substrates 11 and 12 opposite to the predetermined surfaces (surfaces on the liquid crystal side). Yes. The transmission axis directions of the two polarizing sheets 13 are shifted from each other by about 90 °.
　この液晶表示パネル１０の裏面側に設置されるバックライトユニット２０は、バックシャーシ２１と、光源モジュール２２と、反射シート２３と、拡散板２４と、光学シート２５とを少なくとも備えている。なお、拡散板２４は、本発明の「透光板」の一例である。 The backlight unit 20 installed on the back side of the liquid crystal display panel 10 includes at least a back chassis 21, a light source module 22, a reflection sheet 23, a diffusion plate 24, and an optical sheet 25. The diffuser plate 24 is an example of the “translucent plate” in the present invention.
　バックシャーシ２１は、液晶表示パネル１０側が開口された略箱状に形成されている。すなわち、バックシャーシ２１は、平面視（液晶表示パネル１０側から平面的に見た場合）における形状が略長方形状の底部２１ａと、底部２１ａの外周に立設する側部２１ｂとを有している。そして、バックシャーシ２１の底部２１ａおよび側部２１ｂで取り囲まれた領域が収容領域とされている。 The back chassis 21 is formed in a substantially box shape with the liquid crystal display panel 10 side opened. That is, the back chassis 21 has a bottom portion 21a having a substantially rectangular shape in plan view (when viewed from the liquid crystal display panel 10 side), and a side portion 21b standing on the outer periphery of the bottom portion 21a. Yes. And the area | region enclosed by the bottom part 21a and the side part 21b of the back chassis 21 is made into the accommodation area | region.
　光源モジュール２２は、バックシャーシ２１の収容領域に複数収容され、バックシャーシ２１の底部２１ａに固定されている。そして、バックライトユニット２０が液晶表示パネル１０の裏面側に設置された状態においては、光源モジュール２２が液晶表示パネル１０の直下（液晶表示パネル１０の裏面と対向する領域）に配置される。 A plurality of light source modules 22 are housed in the housing area of the back chassis 21 and are fixed to the bottom 21 a of the back chassis 21. In a state where the backlight unit 20 is installed on the back side of the liquid crystal display panel 10, the light source module 22 is disposed immediately below the liquid crystal display panel 10 (region facing the back side of the liquid crystal display panel 10).
　光源モジュール２２の構造としては、それぞれが紫外線を発する２個以上のＬＥＤパッケージ２６を光源として持ち、その２個以上のＬＥＤパッケージ２６が短冊状に形成された同一のＬＥＤ基板２７の搭載面上に搭載されたものとなっている。２個以上のＬＥＤパッケージ２６から発せられる紫外線のピーク波長は４００ｎｍ以下（たとえば、２１０ｎｍ～４００ｎｍ程度）である。また、２個以上のＬＥＤパッケージ２６は、ＬＥＤ基板２７の長手方向に沿って一列に並べられ、かつ、直列に接続されている。なお、同一のＬＥＤ基板２７の搭載面上に搭載するＬＥＤパッケージ２６の搭載数については特に限定されるものではなく、用途に応じて変更可能である。 The light source module 22 has a structure in which two or more LED packages 26 each emitting ultraviolet light are used as light sources, and the two or more LED packages 26 are formed on a mounting surface of the same LED substrate 27 formed in a strip shape. It has been installed. The peak wavelength of ultraviolet rays emitted from two or more LED packages 26 is 400 nm or less (for example, about 210 nm to 400 nm). Further, the two or more LED packages 26 are arranged in a line along the longitudinal direction of the LED substrate 27 and are connected in series. Note that the number of LED packages 26 to be mounted on the mounting surface of the same LED substrate 27 is not particularly limited, and can be changed according to the application.
　また、バックシャーシ２１の収容領域に複数の光源モジュール２２が収容されていることは既に述べたが、それら複数の光源モジュール２２は、バックシャーシ２１の底部２１ａの底面に対して平行な方向であるＸ方向（バックシャーシ２１の長手方向）およびＹ方向（バックシャーシ２１の短手方向）に互いに所定の間隔を隔てて二次元的に配列されている。なお、この状態においては、ＬＥＤ基板２７の長手方向とＸ方向とが一致し、ＬＥＤ基板２７の短手方向とＹ方向とが一致している。 As described above, the plurality of light source modules 22 are accommodated in the accommodation area of the back chassis 21, but the plurality of light source modules 22 are parallel to the bottom surface of the bottom portion 21 a of the back chassis 21. They are two-dimensionally arranged at predetermined intervals in the X direction (longitudinal direction of the back chassis 21) and the Y direction (short direction of the back chassis 21). In this state, the longitudinal direction of the LED board 27 and the X direction coincide with each other, and the short side direction of the LED board 27 and the Y direction coincide with each other.
　そして、Ｘ方向に隣り合う光源モジュール２２同士は、図示しないコネクタを介して互いに電気的に接続されている。言い換えると、Ｘ方向に隣り合う一方の光源モジュール２２および他方の光源モジュール２２のそれぞれに含まれるＬＥＤ基板２７同士がコネクタを介して互いに電気的に接続されている。 The light source modules 22 adjacent in the X direction are electrically connected to each other via a connector (not shown). In other words, the LED boards 27 included in each of the one light source module 22 and the other light source module 22 adjacent in the X direction are electrically connected to each other via the connector.
　反射シート２３は、ＬＥＤパッケージ２６から発せられた紫外線を液晶表示パネル１０側に向けて反射するためのものであって、光源モジュール２２と共にバックシャーシ２１の収容領域に収容されている。この反射シート２３の形状としては、平面視における形状が略長方形状の底部２３ａと、底部２３ａの外周に立設する斜めに傾斜した側部２３ｂとを有したものとなっている。 The reflection sheet 23 is for reflecting the ultraviolet rays emitted from the LED package 26 toward the liquid crystal display panel 10, and is housed in the housing area of the back chassis 21 together with the light source module 22. The shape of the reflection sheet 23 includes a bottom portion 23a having a substantially rectangular shape in plan view, and an obliquely inclined side portion 23b standing on the outer periphery of the bottom portion 23a.
　そして、バックシャーシ２１の収容領域に反射シート２３が収容された状態では、反射シート２３の底部２３ａがバックシャーシ２１の底部２１ａの底面上にＬＥＤ基板２７を挟んで載置されている。すなわち、反射シート２３の底部２３ａは、ＬＥＤ基板２７の搭載面（バックシャーシ２１の底部２１ａの底面のうちのＬＥＤ基板２７と重畳していない面も含む）を覆っている。一方、反射シート２３の側部２３ｂは、バックシャーシ２１の側部２１ｂの内側面を覆っている。 In the state where the reflection sheet 23 is accommodated in the accommodation area of the back chassis 21, the bottom 23 a of the reflection sheet 23 is placed on the bottom surface of the bottom 21 a of the back chassis 21 with the LED substrate 27 interposed therebetween. That is, the bottom portion 23 a of the reflection sheet 23 covers the mounting surface of the LED substrate 27 (including the surface of the bottom surface 21 a of the back chassis 21 that does not overlap the LED substrate 27). On the other hand, the side portion 23 b of the reflection sheet 23 covers the inner side surface of the side portion 21 b of the back chassis 21.
　なお、反射シート２３の底部２３ａでＬＥＤ基板２７の搭載面の全面を覆うようにすると、ＬＥＤ基板２７の搭載面上に搭載されたＬＥＤパッケージ２６も反射シート２３の底部２３ａで覆われてしまう。したがって、反射シート２３の底部２３ａには、ＬＥＤパッケージ２６を液晶表示パネル１０側に露出させるために、開口形状が円形状とされた露出穴２３ｃがＬＥＤパッケージ２６と同数だけ形成されている。そして、それら反射シート２３の露出穴２３ｃのそれぞれから、ＬＥＤパッケージ２６が１つずつ液晶表示パネル１０側に露出（突出）されている。 If the bottom surface 23 a of the reflection sheet 23 covers the entire surface of the LED substrate 27, the LED package 26 mounted on the LED substrate 27 is also covered with the bottom portion 23 a of the reflection sheet 23. Accordingly, the same number of exposure holes 23c having circular openings are formed in the bottom 23a of the reflection sheet 23 so that the LED package 26 is exposed to the liquid crystal display panel 10 side. One LED package 26 is exposed (projected) to the liquid crystal display panel 10 side from each of the exposed holes 23 c of the reflection sheet 23.
　拡散板２４は、ＬＥＤパッケージ２６から発せられた紫外線を導入して液晶表示パネル１０側に向けて拡散出射するためのものであって、略長方形状の前面およびその反対面である後面と、前面および後面に繋がる複数の側面とを有している。そして、拡散板２４はバックシャーシ２１の開口を塞ぐように配置されており、拡散板２４の前面が液晶表示パネル１０側に向けられ、拡散板２４の後面がバックシャーシ２１の底部２１ａ側に向けられた状態となっている。すなわち、この拡散板２４によって、光源モジュール２２が液晶表示パネル１０側から覆われている。 The diffusion plate 24 is for introducing ultraviolet rays emitted from the LED package 26 and diffusing and emitting the ultraviolet rays toward the liquid crystal display panel 10 side. The diffusion plate 24 has a substantially rectangular front surface and a rear surface opposite to the front surface. And a plurality of side surfaces connected to the rear surface. The diffusion plate 24 is disposed so as to close the opening of the back chassis 21, the front surface of the diffusion plate 24 is directed toward the liquid crystal display panel 10, and the rear surface of the diffusion plate 24 is directed toward the bottom 21 a side of the back chassis 21. It is in the state that was. That is, the light source module 22 is covered by the diffusion plate 24 from the liquid crystal display panel 10 side.
　これにより、ＬＥＤパッケージ２６から紫外線が発せられると、その紫外線が拡散板２４の後面から拡散板２４内に導入される。そして、拡散板２４内に導入された紫外線は、拡散板２４の前面から液晶表示パネル１０側に向けて拡散出射される。なお、以下の説明では、拡散板２４の前面を出射面２４ａと言う。 Thereby, when ultraviolet rays are emitted from the LED package 26, the ultraviolet rays are introduced into the diffusion plate 24 from the rear surface of the diffusion plate 24. The ultraviolet rays introduced into the diffusion plate 24 are diffused and emitted from the front surface of the diffusion plate 24 toward the liquid crystal display panel 10 side. In the following description, the front surface of the diffusion plate 24 is referred to as an emission surface 24a.
　この拡散板２４の構成材料は特に限定されるものではないが、たとえば、アクリル樹脂やビニル樹脂などが考えられる。また、拡散板２４の形状および板厚についても特に限定されず、用途に応じて変更可能である。 The constituent material of the diffusion plate 24 is not particularly limited, and for example, an acrylic resin or a vinyl resin can be considered. Further, the shape and thickness of the diffusion plate 24 are not particularly limited, and can be changed according to the application.
　光学シート２５は、拡散シートやレンズシートなどを含むシート群であり、拡散板２４の出射面２４ａ上に配置されている。この光学シート２５の種類や使用枚数については、用途に応じて適宜変更される。なお、後に詳細に説明するが、拡散板２４の出射面２４ａ上には蛍光部材２８（図２参照）が形成される。このため、実際には、拡散板２４と光学シート２５との間に蛍光部材２８が挟み込まれる。言い換えると、光学シート２５は、拡散板２４の出射面２４ａ上に蛍光部材２８を介して配置されることになる。 The optical sheet 25 is a sheet group including a diffusion sheet, a lens sheet, and the like, and is disposed on the emission surface 24 a of the diffusion plate 24. The type and the number of sheets used of the optical sheet 25 are appropriately changed according to the application. As will be described in detail later, a fluorescent member 28 (see FIG. 2) is formed on the emission surface 24a of the diffusion plate 24. For this reason, the fluorescent member 28 is actually sandwiched between the diffusion plate 24 and the optical sheet 25. In other words, the optical sheet 25 is disposed on the emission surface 24 a of the diffusion plate 24 via the fluorescent member 28.
　ここで、第１実施形態では、図２に示すように、紫外線を吸収して白色光を発光する蛍光部材２８を拡散板２４の出射面２４ａに塗布することで、拡散板２４の出射面２４ａ上に蛍光部材２８が形成された状態にしている。このため、拡散板２４の出射面２４ａからは紫外線が出射されるが、その紫外線は蛍光部材２８によって白色光に変換される。したがって、光学シート２５（図１参照）には白色光が入射され、光学シート２５で拡散（集光）された白色光が液晶表示パネル１０（図１参照）の裏面を照明することになる。 Here, in the first embodiment, as shown in FIG. 2, by applying a fluorescent member 28 that absorbs ultraviolet rays and emits white light to the emission surface 24 a of the diffusion plate 24, the emission surface 24 a of the diffusion plate 24. The fluorescent member 28 is formed on the top. For this reason, although ultraviolet rays are emitted from the emission surface 24 a of the diffusion plate 24, the ultraviolet rays are converted into white light by the fluorescent member 28. Therefore, white light is incident on the optical sheet 25 (see FIG. 1), and the white light diffused (collected) by the optical sheet 25 illuminates the back surface of the liquid crystal display panel 10 (see FIG. 1).
　拡散板２４の出射面２４ａ上に形成する蛍光部材２８としては、たとえば、紫外線を吸収して赤色光に変換する蛍光体、紫外線を吸収して緑色光に変換する蛍光体、および、紫外線を吸収して青色光に変換する蛍光体、の３種類の蛍光体を含んだものである。これにより、蛍光部材２８に含まれる各蛍光体が紫外線で励起されて発光すれば、それらが混色して白色となるので、蛍光部材２８は白色に発光することになる。もちろん、蛍光部材２８の発光色が白色になるのであれば、蛍光部材２８に含まれる蛍光体は何種類であってもよい。 As the fluorescent member 28 formed on the emission surface 24a of the diffusion plate 24, for example, a phosphor that absorbs ultraviolet rays and converts them into red light, a phosphor that absorbs ultraviolet rays and converts it into green light, and absorbs ultraviolet rays. Thus, the phosphor contains three types of phosphors that convert blue light. Thereby, if each phosphor contained in the fluorescent member 28 is excited by ultraviolet rays and emits light, they are mixed and become white, so that the fluorescent member 28 emits white light. Of course, as long as the emission color of the fluorescent member 28 becomes white, the fluorescent member 28 may include any number of phosphors.
　ところで、拡散板２４の出射面２４ａからの紫外線の単位面積当たりの出射量は、全面にわたって均一にはなっておらず、出射位置によって異なっている。すなわち、図３に示すように、拡散板２４の出射面２４ａのうち、平面視（拡散板２４の出射面２４ａと対向する側から平面的に見た場合）においてＬＥＤパッケージ２６の近傍領域２６ａと重畳する所定の出射面領域（本発明の「第１出射面領域」に相当）からの紫外線の単位面積当たりの出射量は、所定の出射面領域以外の他の出射面領域（本発明の「第２出射面領域」に相当）からの紫外線の単位面積当たりの出射量よりも多くなっている。さらに、所定の出射面領域以外の他の出射面領域からの紫外線の単位面積当たりの出射量については、所定の出射面領域から離れるにしたがって徐々に少なくなっている。なお、以下の説明では、拡散板２４の出射面２４ａのうち、紫外線の出射量が最も多い所定の出射面領域を第１出射面領域と称し、所定の出射面領域よりも紫外線の出射量が少ない他の出射面領域を第２出射面領域と称して区別する。 Incidentally, the amount of ultraviolet light emitted from the light exit surface 24a of the diffusion plate 24 per unit area is not uniform over the entire surface, and varies depending on the light output position. That is, as shown in FIG. 3, the vicinity area 26 a of the LED package 26 in the plan view (when viewed in a plan view from the side facing the emission surface 24 a of the diffusion plate 24) of the emission surface 24 a of the diffusion plate 24. The amount of ultraviolet light emitted per unit area from a predetermined overlapping exit surface region (corresponding to the “first exit surface region” of the present invention) is an exit surface region other than the predetermined exit surface region (“ It corresponds to the amount of the emitted light per unit area of the ultraviolet light from the “second emission surface area”. Furthermore, the amount of ultraviolet light emitted per unit area other than the predetermined emission surface area gradually decreases as the distance from the predetermined emission surface area increases. In the following description, a predetermined emission surface region having the largest ultraviolet ray emission amount among the emission surfaces 24a of the diffusion plate 24 is referred to as a first emission surface region, and the ultraviolet ray emission amount is larger than that of the predetermined emission surface region. A small number of other exit surface regions are referred to as second exit surface regions to be distinguished.
　そこで、第１実施形態では、第１出射面領域における蛍光部材２８の形成密度に対して第２出射面領域における蛍光部材２８の形成密度を高くしている。さらに、第２出射面領域における蛍光部材２８の形成密度については、第１出射面領域から離れるにしたがって徐々に高くしている。そして、そのようにすることによって、第１出射面領域において蛍光部材２８に入射する単位面積当たりの紫外線量と、第２出射面領域において蛍光部材２８に入射する単位面積当たりの紫外線量との差を小さくしている。言い換えると、第１出射面領域における単位面積当たりの発光量と、第２出射面領域における単位面積当たりの発光量との差を小さくしている。 Therefore, in the first embodiment, the formation density of the fluorescent member 28 in the second emission surface region is set higher than the formation density of the fluorescent member 28 in the first emission surface region. Furthermore, the formation density of the fluorescent members 28 in the second emission surface area is gradually increased as the distance from the first emission surface area increases. By doing so, the difference between the amount of ultraviolet light per unit area incident on the fluorescent member 28 in the first emission surface area and the amount of ultraviolet light per unit area incident on the fluorescent member 28 in the second emission surface area. Is made smaller. In other words, the difference between the light emission amount per unit area in the first emission surface region and the light emission amount per unit area in the second emission surface region is reduced.
　このように、拡散板２４の出射面２４ａの位置に応じて蛍光部材２８の形成密度を異ならせるために、第１実施形態では、拡散板２４の出射面２４ａの全面を蛍光部材２８で覆ってはいない。すなわち、蛍光部材２８が拡散板２４の出射面２４ａの全面上に均一に形成されておらず、拡散板２４の出射面２４ａが部分的に露出されている。 Thus, in order to make the formation density of the fluorescent member 28 different according to the position of the emission surface 24a of the diffusion plate 24, in the first embodiment, the entire emission surface 24a of the diffusion plate 24 is covered with the fluorescent member 28. No. That is, the fluorescent member 28 is not uniformly formed on the entire emission surface 24a of the diffusion plate 24, and the emission surface 24a of the diffusion plate 24 is partially exposed.
　具体的に言うと、この蛍光部材２８は、それぞれが略円形状に形成された複数の島状部２８ａからなっている。そして、第１出射面領域における蛍光部材２８の形成密度に対して第２出射面領域における蛍光部材２８の形成密度が高くなるように、複数の島状部２８ａが互い離間するように分散して配置されている。さらに、蛍光部材２８の形成密度が第１出射面領域から離れるにしたがって徐々に高くなるように、複数の島状部２８ａの外形サイズ（直径）Ｄが第１出射面領域から離れるにしたがって徐々に大きくされている。なお、蛍光部材２８に含まれる複数の島状部２８ａの外形サイズＤとしては、第１出射面領域から離れるにしたがって徐々に大きくなっていれば、用途などに応じて適宜変更可能である。 More specifically, the fluorescent member 28 is composed of a plurality of island-shaped portions 28a each formed in a substantially circular shape. Then, the plurality of island portions 28a are dispersed so as to be separated from each other so that the formation density of the fluorescent members 28 in the second emission surface area is higher than the formation density of the fluorescence members 28 in the first emission surface area. Is arranged. Further, the outer shape size (diameter) D of the plurality of island-shaped portions 28a gradually increases as the distance from the first emission surface region increases so that the formation density of the fluorescent members 28 gradually increases as the distance from the first emission surface region increases. It has been enlarged. Note that the outer size D of the plurality of island-shaped portions 28a included in the fluorescent member 28 can be changed as appropriate according to the use and the like as long as it gradually increases with distance from the first emission surface area.
　第１実施形態では、上記のように、紫外線を発するＬＥＤパッケージ２６を光源として用い、紫外線を吸収して発光する蛍光部材２８を拡散板２４の出射面２４ａ上に形成することによって、拡散板２４の出射面２４ａから出射された紫外線が蛍光部材２８に入射するので、蛍光部材２８が励起されて白色に発光し、その蛍光部材２８から発せられる白色光がバックライト光の基となる。そして、このようにすると、蛍光部材２８から発せられる白色光は四方八方に広がるので、拡散板２４とＬＥＤパッケージ２６との間の距離を小さくすることでバックライトユニット２０の薄型化を図ったとしても、バックライト光に輝度ムラが生じてしまうのを抑制することが可能となる。 In the first embodiment, as described above, the LED package 26 that emits ultraviolet rays is used as the light source, and the fluorescent member 28 that emits light by absorbing the ultraviolet rays is formed on the emission surface 24a of the diffusion plate 24, thereby diffusing the plate 24. Since the ultraviolet rays emitted from the emission surface 24a enter the fluorescent member 28, the fluorescent member 28 is excited to emit white light, and the white light emitted from the fluorescent member 28 becomes the basis of the backlight light. In this case, since the white light emitted from the fluorescent member 28 spreads in all directions, it is assumed that the backlight unit 20 is thinned by reducing the distance between the diffusion plate 24 and the LED package 26. However, it is possible to suppress the occurrence of luminance unevenness in the backlight light.
　特に、第１実施形態では、拡散板２４の出射面２４ａの出射位置によって単位面積当たりの紫外線の出射量が異なっている（第１出射面領域における紫外線の単位面積当たりの出射量が第２出射面領域における紫外線の単位面積当たりの出射量よりも多くなっている）が、第１出射面領域における蛍光部材２８の形成密度を低くし、第２出射面領域における蛍光部材２８の形成密度を高くしているので、第１出射面領域において蛍光部材２８に入射する単位面積当たりの紫外線量と、第２出射面領域において蛍光部材２８に入射する単位面積当たりの紫外線量との差（第１出射面領域における単位面積当たりの発光量と、第２出射面領域における単位面積当たりの発光量との差）が小さくなる。これにより、拡散板２４の出射面２４ａの出射位置によって単位面積当たりの紫外線の出射量が異なっていたとしても、バックライト光に生じる輝度ムラが効果的に抑制される。 In particular, in the first embodiment, the amount of ultraviolet rays emitted per unit area differs depending on the emission position of the emission surface 24a of the diffusion plate 24 (the amount of emitted ultraviolet light per unit area in the first emission surface region is the second emission amount). The amount of ultraviolet light emitted per unit area in the surface area is larger), which lowers the formation density of the fluorescent member 28 in the first emission surface area and increases the formation density of the fluorescent member 28 in the second emission surface area. Therefore, the difference between the amount of ultraviolet light per unit area incident on the fluorescent member 28 in the first emission surface area and the amount of ultraviolet light per unit area incident on the fluorescent member 28 in the second emission surface area (first emission surface). The difference between the light emission amount per unit area in the surface area and the light emission amount per unit area in the second emission surface area) is reduced. Thereby, even if the amount of ultraviolet rays emitted per unit area differs depending on the emission position of the emission surface 24a of the diffusing plate 24, luminance unevenness generated in the backlight light is effectively suppressed.
　また、第１実施形態では、上記のように、拡散板２４の出射面２４ａを全面にわたって蛍光部材２８で覆わずに部分的に露出させるようにすることによって、その拡散板２４の出射面２４ａの露出部分の位置を適宜調整すれば、容易に、第１出射面領域における蛍光部材２８の形成密度に対して第２出射面領域における蛍光部材２８の形成密度を高くすることができる。 In the first embodiment, as described above, the exit surface 24a of the diffuser plate 24 is partially exposed without being covered with the fluorescent member 28 over the entire surface, so that the exit surface 24a of the diffuser plate 24 is exposed. If the position of the exposed portion is appropriately adjusted, the formation density of the fluorescent member 28 in the second emission surface area can be easily increased with respect to the formation density of the fluorescence member 28 in the first emission surface area.
　この場合、第１実施形態では、蛍光部材２８（複数の島状部２８ａ）を分散して配置するようにしているので、容易に、第１出射面領域における蛍光部材２８の形成密度に対して第２出射面領域における蛍光部材２８の形成密度が高くなるように、拡散板２４の出射面２４ａの露出部分の位置を適宜調整することができる。 In this case, in the first embodiment, since the fluorescent members 28 (the plurality of island portions 28a) are arranged in a distributed manner, the formation density of the fluorescent members 28 in the first emission surface region can be easily determined. The position of the exposed portion of the exit surface 24a of the diffusion plate 24 can be adjusted as appropriate so that the formation density of the fluorescent members 28 in the second exit surface region is increased.
　さらに、第１実施形態では、蛍光部材２８としての複数の島状部２８ａの外形サイズＤを第１出射面領域から離れるにしたがって徐々に大きくしているので、蛍光部材２８の形成密度が第１出射面領域から離れるにしたがって徐々に高くなっている。したがって、紫外線の単位面積当たりの出射量が第１出射面領域から離れるにしたがって徐々に少なくなっていたとしても、バックライト光に輝度ムラが生じるのを効果的に抑制することができる。 Furthermore, in the first embodiment, since the outer size D of the plurality of island-shaped portions 28a as the fluorescent member 28 is gradually increased as the distance from the first emission surface region is increased, the formation density of the fluorescent member 28 is first. It gradually increases as the distance from the exit surface area increases. Therefore, even if the emission amount per unit area of the ultraviolet rays gradually decreases as the distance from the first emission surface region increases, it is possible to effectively suppress the occurrence of luminance unevenness in the backlight light.
　また、第１実施形態では、上記のように、拡散板２４の出射面２４ａ上に蛍光部材２８を介して光学シート２５を配置することによって、蛍光部材２８から発せられた白色光を拡散したり集光したりすることができる。これにより、より良好なバックライト光を得ることができる。 In the first embodiment, as described above, the optical sheet 25 is disposed on the emission surface 24a of the diffusion plate 24 via the fluorescent member 28, thereby diffusing white light emitted from the fluorescent member 28. It can be condensed. Thereby, better backlight light can be obtained.
　また、第１実施形態では、上記のように、光拡散機能を持たない単なる透明板ではなくて拡散板２４の出射面２４ａ上に蛍光部材２８を形成することによって、光拡散効果が向上するので、バックライト光に輝度ムラが生じるのをより抑制することができる。 In the first embodiment, as described above, the light diffusing effect is improved by forming the fluorescent member 28 on the emission surface 24a of the diffusing plate 24 instead of a mere transparent plate having no light diffusing function. Further, it is possible to further suppress the occurrence of luminance unevenness in the backlight light.
　なお、第１実施形態の構成において、蛍光部材２８としての複数の島状部２８ａの外形形状を変更してもよい。たとえば、蛍光部材２８としての複数の島状部２８ａの外形形状が四角形状（略四角形状を含む）や三角形状（略三角形状を含む）であってもよく、さらに、それら以外の形状であってもよい。 In the configuration of the first embodiment, the outer shape of the plurality of island portions 28a as the fluorescent member 28 may be changed. For example, the outer shape of the plurality of island-shaped portions 28a as the fluorescent member 28 may be a quadrangular shape (including a substantially quadrangular shape) or a triangular shape (including a substantially triangular shape), and may have other shapes. May be.
　また、第１実施形態の構成において、拡散板２４に代えて、光拡散機能を持たない単なる透明板を用いてもよい。すなわち、光拡散機能を持たない単なる透明板上に蛍光部材２８を形成するようにしてもよい。この場合には、透明板が本発明の「透光板」に相当することになる。 In the configuration of the first embodiment, a simple transparent plate having no light diffusion function may be used instead of the diffusion plate 24. That is, the fluorescent member 28 may be formed on a simple transparent plate having no light diffusion function. In this case, the transparent plate corresponds to the “translucent plate” of the present invention.
　（第２実施形態）
　次に、図４を参照して、この第２実施形態では、第１実施形態と同様、拡散板２４の出射面２４ａ上に蛍光部材２８が形成されており、その蛍光部材２８が複数の島状部２８ａからなっている。また、第１出射面領域における蛍光部材２８の形成密度に対して第２出射面領域における蛍光部材２８の形成密度が高くなるように、蛍光部材２８としての複数の島状部２８ａが互い離間するように分散されている。 (Second Embodiment)
Next, referring to FIG. 4, in the second embodiment, as in the first embodiment, the fluorescent member 28 is formed on the emission surface 24a of the diffusion plate 24, and the fluorescent member 28 includes a plurality of islands. It consists of the shape part 28a. Further, the plurality of island portions 28a as the fluorescent member 28 are separated from each other so that the formation density of the fluorescent member 28 in the second emission surface region is higher than the formation density of the fluorescent member 28 in the first emission surface region. Are so distributed.
　ただし、第２実施形態では、蛍光部材２８としての複数の島状部２８ａの外形サイズが互いに略同じになっている。そして、蛍光部材２８の形成密度が第１出射面領域から離れるにしたがって徐々に高くなるように、複数の島状部２８ａの分散間隔Ｇが第１出射面領域から離れるにしたがって徐々に小さくされている。なお、蛍光部材２８に含まれる複数の島状部２８ａの分散間隔Ｇとしては、第１出射面領域から離れるにしたがって徐々に小さくなっていれば、用途などに応じて適宜変更可能である。 However, in the second embodiment, the plurality of island portions 28a as the fluorescent member 28 have substantially the same outer size. And the dispersion | distribution space | interval G of the some island-shaped part 28a is made small gradually as it leaves | separates from a 1st output surface area so that the formation density of the fluorescent member 28 may become high gradually as it leaves | separates from a 1st output surface area | region. Yes. In addition, as the dispersion | distribution space | interval G of the some island-shaped part 28a contained in the fluorescent member 28, if it becomes small gradually as it leaves | separates from a 1st output surface area | region, it can change suitably according to a use etc.
　第２実施形態のその他の構成は、第１実施形態の構成と同様であるため、その詳細な説明は省略する。 The other configuration of the second embodiment is the same as the configuration of the first embodiment, and a detailed description thereof will be omitted.
　第２実施形態では、上記のように、蛍光部材２８としての複数の島状部２８ａの分散間隔Ｇを第１出射面領域から離れるにしたがって徐々に小さくすることによって、蛍光部材２８の形成密度が第１出射面領域から離れるにしたがって徐々に高くなる。これにより、第１実施形態と同様、紫外線の単位面積当たりの出射量が第１出射面領域から離れるにしたがって徐々に少なくなっていたとしても、バックライト光に輝度ムラが生じるのを効果的に抑制することができる。 In the second embodiment, as described above, the formation density of the fluorescent member 28 is reduced by gradually decreasing the dispersion interval G of the plurality of island-like portions 28a as the fluorescent member 28 as the distance from the first emission surface region increases. The distance gradually increases as the distance from the first exit surface area increases. As a result, as in the first embodiment, even if the emission amount per unit area of ultraviolet light gradually decreases as the distance from the first emission surface region increases, it is effective to cause uneven brightness in the backlight light. Can be suppressed.
　この第２実施形態のその他の効果は、第１実施形態の効果と同様である。 Other effects of the second embodiment are the same as those of the first embodiment.
　なお、第２実施形態の構成において、蛍光部材２８としての複数の島状部２８ａの分散間隔を第１出射面領域から離れるにしたがって徐々に小さくし、かつ、蛍光部材２８としての複数の島状部２８ａの外形サイズを第１出射面領域から離れるにしたがって徐々に大きくしてもよい。すなわち、第２実施形態の構成に第１実施形態の構成を組み合わせるようにしてもよい。 In the configuration of the second embodiment, the dispersion interval of the plurality of island-shaped portions 28a as the fluorescent member 28 is gradually reduced as the distance from the first emission surface region increases, and the plurality of island-shaped as the fluorescent member 28 is formed. The outer size of the portion 28a may be gradually increased as the distance from the first exit surface area increases. That is, the configuration of the first embodiment may be combined with the configuration of the second embodiment.
　（第３実施形態）
　以下に、図５を参照して、第３実施形態の構成について説明する。 (Third embodiment)
The configuration of the third embodiment will be described below with reference to FIG.
　第３実施形態では、図５に示すように、第１実施形態の蛍光部材２８と同様の材料からなる蛍光部材３８が拡散板２４の出射面２４ａ上に形成されているが、その蛍光部材３８は複数の線状部３８ａを含んでいる。なお、図５は断面図ではないが、図面を見易くするために、蛍光部材３８に対応する部分にハッチングを施している。 In the third embodiment, as shown in FIG. 5, a fluorescent member 38 made of the same material as that of the fluorescent member 28 of the first embodiment is formed on the emission surface 24 a of the diffusion plate 24. Includes a plurality of linear portions 38a. Although FIG. 5 is not a cross-sectional view, hatching is applied to a portion corresponding to the fluorescent member 38 in order to make the drawing easy to see.
　そして、第１出射面領域における蛍光部材３８の形成密度に対して第２出射面領域における蛍光部材３８の形成密度が高くなり、かつ、蛍光部材３８の形成密度が第１出射面領域から離れるにしたがって徐々に高くなるように、複数の線状部３８ａが格子状に配置されている。より具体的には、蛍光部材３８としての複数の線状部３８ａの線幅Ｗが第１出射面領域から離れるにしたがって徐々に大きくされている。なお、蛍光部材３８に含まれる複数の線状部３８ａの線幅Ｗとしては、第１出射面領域から離れるにしたがって徐々に大きくなっていれば、用途などに応じて適宜変更可能である。 The formation density of the fluorescent member 38 in the second emission surface area is higher than the formation density of the fluorescent member 38 in the first emission surface area, and the formation density of the fluorescent member 38 is separated from the first emission surface area. Therefore, the plurality of linear portions 38a are arranged in a lattice pattern so as to gradually increase. More specifically, the line width W of the plurality of linear portions 38a as the fluorescent member 38 is gradually increased as the distance from the first emission surface area increases. Note that the line width W of the plurality of linear portions 38a included in the fluorescent member 38 can be changed as appropriate depending on the application and the like as long as it gradually increases as the distance from the first emission surface region increases.
　第３実施形態のその他の構成は、第１実施形態の構成と同様であるため、その詳細な説明は省略する。 Other configurations of the third embodiment are the same as the configurations of the first embodiment, and thus detailed description thereof is omitted.
　第３実施形態では、上記のように、複数の線状部３８ａからなる蛍光部材３８を拡散板２４の出射面２４ａ上に形成するとともに、その複数の線状部３８ａを格子状に配置し、かつ、複数の線状部３８ａの線幅Ｗを第１出射面領域から離れるにしたがって徐々に大きくすることによって、蛍光部材３８の形成密度が第１出射面領域から離れるにしたがって徐々に高くなる。これにより、第１実施形態と同様、紫外線の単位面積当たりの出射量が第１出射面領域から離れるにしたがって徐々に少なくなっていたとしても、バックライト光に輝度ムラが生じるのを効果的に抑制することができる。 In the third embodiment, as described above, the fluorescent member 38 composed of a plurality of linear portions 38a is formed on the emission surface 24a of the diffusion plate 24, and the plurality of linear portions 38a are arranged in a lattice pattern, Further, by gradually increasing the line width W of the plurality of linear portions 38a as the distance from the first emission surface area increases, the formation density of the fluorescent member 38 gradually increases as the distance from the first emission surface area increases. As a result, as in the first embodiment, even if the emission amount per unit area of ultraviolet light gradually decreases as the distance from the first emission surface region increases, it is effective to cause uneven brightness in the backlight light. Can be suppressed.
　この第３実施形態のその他の効果は、第１実施形態の効果と同様である。 Other effects of the third embodiment are the same as those of the first embodiment.
　（第４実施形態）
　次に、図６を参照して、この第４実施形態では、第３実施形態と同様、拡散板２４の出射面２４ａ上に蛍光部材３８が形成されており、その蛍光部材３８が複数の線状部３８ａからなっている。また、第１出射面領域における蛍光部材３８の形成密度に対して第２出射面領域における蛍光部材３８の形成密度が高くなり、かつ、蛍光部材３８の形成密度が第１出射面領域から離れるにしたがって徐々に高くなるように、複数の線状部３８ａが格子状に配置されている。なお、図６は断面図ではないが、図面を見易くするために、蛍光部材３８に対応する部分にハッチングを施している。 (Fourth embodiment)
Next, referring to FIG. 6, in the fourth embodiment, as in the third embodiment, the fluorescent member 38 is formed on the emission surface 24a of the diffuser plate 24, and the fluorescent member 38 includes a plurality of lines. It consists of the shape part 38a. In addition, the formation density of the fluorescent member 38 in the second emission surface region is higher than the formation density of the fluorescence member 38 in the first emission surface region, and the formation density of the fluorescence member 38 is separated from the first emission surface region. Therefore, the plurality of linear portions 38a are arranged in a lattice pattern so as to gradually increase. Although FIG. 6 is not a cross-sectional view, a portion corresponding to the fluorescent member 38 is hatched to make the drawing easy to see.
　ただし、第４実施形態では、蛍光部材３８としての複数の線状部３８ａの線幅が互いに略同じになっている。そして、蛍光部材３８の形成密度が第１出射面領域から離れるにしたがって徐々に高くなるように、複数の線状部３８ａの隣接間隔Ｇが第１出射面領域から離れるにしたがって徐々に小さくされている。なお、蛍光部材３８に含まれる複数の線状部３８ａの隣接間隔Ｇとしては、第１出射面領域から離れるにしたがって徐々に小さくなっていれば、用途などに応じて適宜変更可能である。 However, in the fourth embodiment, the line widths of the plurality of linear portions 38a as the fluorescent member 38 are substantially the same. The adjacent spacing G of the plurality of linear portions 38a is gradually decreased as the distance from the first emission surface area is increased so that the formation density of the fluorescent member 38 gradually increases as the distance from the first emission surface area increases. Yes. It should be noted that the adjacent gap G between the plurality of linear portions 38a included in the fluorescent member 38 can be appropriately changed depending on the application and the like as long as it gradually decreases as the distance from the first emission surface region increases.
　第４実施形態のその他の構成は、第１実施形態の構成と同様であるため、その詳細な説明は省略する。 The other configurations of the fourth embodiment are the same as the configurations of the first embodiment, and thus detailed description thereof is omitted.
　第４実施形態では、上記のように、複数の線状部３８ａからなる蛍光部材３８を拡散板２４の出射面２４ａ上に形成するとともに、その複数の線状部３８ａを格子状に配置し、かつ、複数の線状部３８ａの隣接間隔Ｇを第１出射面領域から離れるにしたがって徐々に小さくすることによって、蛍光部材３８の形成密度が第１出射面領域から離れるにしたがって徐々に高くなる。これにより、第１実施形態と同様、紫外線の単位面積当たりの出射量が第１出射面領域から離れるにしたがって徐々に少なくなっていたとしても、バックライト光に輝度ムラが生じるのを効果的に抑制することができる。 In the fourth embodiment, as described above, the fluorescent member 38 composed of a plurality of linear portions 38a is formed on the emission surface 24a of the diffusion plate 24, and the plurality of linear portions 38a are arranged in a lattice pattern, In addition, by gradually reducing the interval G between the plurality of linear portions 38a as the distance from the first emission surface area increases, the formation density of the fluorescent member 38 gradually increases as the distance from the first emission surface area increases. As a result, as in the first embodiment, even if the emission amount per unit area of ultraviolet light gradually decreases as the distance from the first emission surface region increases, it is effective to cause uneven brightness in the backlight light. Can be suppressed.
　この第４実施形態のその他の効果は、第１実施形態の効果と同様である。 Other effects of the fourth embodiment are the same as those of the first embodiment.
　なお、第４実施形態の構成において、蛍光部材３８としての複数の線状部３８ａの隣接間隔を第１出射面領域から離れるにしたがって徐々に小さくし、かつ、蛍光部材３８としての複数の線状部３８ａの線幅を第１出射面領域から離れるにしたがって徐々に大きくしてもよい。すなわち、第４実施形態の構成に第３実施形態の構成を組み合わせるようにしてもよい。 In the configuration of the fourth embodiment, the interval between the plurality of linear portions 38a as the fluorescent member 38 is gradually reduced as the distance from the first emission surface region increases, and the plurality of linear shapes as the fluorescent member 38 is used. The line width of the portion 38a may be gradually increased as the distance from the first exit surface area increases. That is, the configuration of the third embodiment may be combined with the configuration of the fourth embodiment.
　（第５実施形態）
　図７を参照して、この第５実施形態では、第１実施形態の蛍光部材２８と同様の材料からなる蛍光部材４８が拡散板２４の出射面２４ａ上に形成されているが、その蛍光部材４８は拡散板２４の出射面２４ａの略全面を覆っている。 (Fifth embodiment)
Referring to FIG. 7, in the fifth embodiment, a fluorescent member 48 made of the same material as that of the fluorescent member 28 of the first embodiment is formed on the emission surface 24a of the diffusion plate 24. Reference numeral 48 covers substantially the entire exit surface 24 a of the diffusion plate 24.
　第５実施形態のその他の構成は、第１実施形態の構成と同様であるため、その詳細な説明は省略する。 The other configuration of the fifth embodiment is the same as the configuration of the first embodiment, and a detailed description thereof will be omitted.
　このように構成された第５実施形態では、拡散板２４の出射面２４ａに対する蛍光部材４８の塗布量を調整する（第１出射面領域における蛍光部材４８の厚みに対して第２出射面領域における蛍光部材４８の厚みを大きくする）ことにより、第１実施形態と同様の効果が得られる。 In the fifth embodiment configured as described above, the amount of the fluorescent member 48 applied to the emission surface 24a of the diffusion plate 24 is adjusted (in the second emission surface region with respect to the thickness of the fluorescence member 48 in the first emission surface region). By increasing the thickness of the fluorescent member 48, the same effect as in the first embodiment can be obtained.
　（第６実施形態）
　以下に、図８を参照して、第６実施形態の構成について説明する。 (Sixth embodiment)
The configuration of the sixth embodiment will be described below with reference to FIG.
　第６実施形態では、液晶表示パネル１０の裏面側に設置されるバックライトユニット５０がエッジライト型とされている。 In the sixth embodiment, the backlight unit 50 installed on the back side of the liquid crystal display panel 10 is an edge light type.
　このエッジライト型のバックライトユニット５０は、導光板５１と、光源モジュール５２と、光学シート５３とを少なくとも備えている。なお、導光板５１は、本発明の「透光板」の一例である。 The edge light type backlight unit 50 includes at least a light guide plate 51, a light source module 52, and an optical sheet 53. The light guide plate 51 is an example of the “translucent plate” in the present invention.
　導光板５１は、前面およびその反対面である後面と、前面および後面に繋がる複数の側端面とを有しており、前面が液晶表示パネル１０側に向くように配置されている。 The light guide plate 51 has a front surface and a rear surface opposite to the front surface, and a plurality of side end surfaces connected to the front surface and the rear surface, and is arranged so that the front surface faces the liquid crystal display panel 10 side.
　光源モジュール５２は、紫外線を発するＬＥＤパッケージ５４を光源として持ち、そのＬＥＤパッケージ５４がＬＥＤ基板５５の搭載面上に搭載されたものとなっている。そして、導光板５１の複数の側端面のうちの所定の側端面とＬＥＤパッケージ５４とが対向するように、導光板５１の所定の側端面の側に光源モジュール５２が配置されている。 The light source module 52 has an LED package 54 that emits ultraviolet rays as a light source, and the LED package 54 is mounted on the mounting surface of the LED substrate 55. And the light source module 52 is arrange | positioned at the side of the predetermined | prescribed side end surface of the light-guide plate 51 so that the predetermined | prescribed side end surface and LED package 54 of the some side end surfaces of the light-guide plate 51 may oppose.
　これにより、ＬＥＤパッケージ５４から紫外線が発せられると、その紫外線が導光板５１の所定の側端面に入射して導光板５１内に導入される。その後、導光板５１内に導入された紫外線は、導光板５１の前面から液晶表示パネル１０側に向けて出射される。なお、以下の説明では、導光板５１の前面を出射面５１ａと言う。 Thus, when ultraviolet rays are emitted from the LED package 54, the ultraviolet rays enter the predetermined side end surface of the light guide plate 51 and are introduced into the light guide plate 51. Thereafter, the ultraviolet light introduced into the light guide plate 51 is emitted from the front surface of the light guide plate 51 toward the liquid crystal display panel 10. In the following description, the front surface of the light guide plate 51 is referred to as an emission surface 51a.
　また、光学シート５３は、拡散シートやレンズシートなどを含むシート群であって、導光板５１の出射面５１ａ上に配置されている。この光学シート５３の種類や使用枚数については、用途に応じて適宜変更される。 The optical sheet 53 is a group of sheets including a diffusion sheet, a lens sheet, and the like, and is disposed on the emission surface 51 a of the light guide plate 51. The type and the number of sheets used of the optical sheet 53 are appropriately changed according to the application.
　ここで、第６実施形態では、導光板５１の出射面５１ａ上に蛍光部材５６が形成されている（導光板５１と光学シート５３との間に蛍光部材５６が挟み込まれている）。この蛍光部材５６は、第１実施形態の蛍光部材２８と同様の材料からなっていて、紫外線を吸収して白色光を発光するようになっている。このため、導光板５１の出射面５１ａからは紫外線が出射されるが、その紫外線は蛍光部材５６によって白色光に変換される。したがって、光学シート５３には白色光が入射され、光学シート５３で拡散（集光）された白色光が液晶表示パネル１０の裏面を照明することになる。 Here, in the sixth embodiment, the fluorescent member 56 is formed on the emission surface 51a of the light guide plate 51 (the fluorescent member 56 is sandwiched between the light guide plate 51 and the optical sheet 53). The fluorescent member 56 is made of the same material as the fluorescent member 28 of the first embodiment, and absorbs ultraviolet rays to emit white light. For this reason, although ultraviolet rays are emitted from the emission surface 51 a of the light guide plate 51, the ultraviolet rays are converted into white light by the fluorescent member 56. Therefore, white light is incident on the optical sheet 53, and the white light diffused (condensed) by the optical sheet 53 illuminates the back surface of the liquid crystal display panel 10.
　このように構成された第６実施形態では、第１実施形態と同様の効果が得られる。 In the sixth embodiment configured as described above, the same effects as in the first embodiment can be obtained.
　今回開示された実施形態は、すべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は、上記した実施形態の説明ではなく特許請求の範囲によって示され、さらに、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれる。 The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and includes all modifications within the meaning and scope equivalent to the scope of claims for patent.
　たとえば、上記実施形態では、液晶表示装置に設置される照明装置に本発明を適用する例について説明したが、本発明はこれに限らず、液晶表示装置以外の表示装置に設置される照明装置に本発明を適用してもよい。 For example, in the above-described embodiment, an example in which the present invention is applied to a lighting device installed in a liquid crystal display device has been described. However, the present invention is not limited thereto, and the lighting device installed in a display device other than the liquid crystal display device is used. The present invention may be applied.
　　１０　液晶表示パネル（表示パネル）
　　２０、５０　バックライトユニット（照明装置）
　　２４　拡散板（透光板）
　　２４ａ、５１ａ　出射面
　　２６、５４　ＬＥＤパッケージ（光源）
　　２８、３８、４８、５６　蛍光部材
　　２８ａ　島状部
　　３８ａ　線状部
　　５１　導光板（透光板） 10 Liquid crystal display panel (display panel)
20, 50 Backlight unit (lighting device)
24 Diffuser (Translucent plate)
24a, 51a Emitting surface 26, 54 LED package (light source)
28, 38, 48, 56 Fluorescent member 28a Island portion 38a Linear portion 51 Light guide plate (translucent plate)

Claims (12)

  1. 　紫外線を発する光源と、
    　被照明体側に向く出射面を有し、前記光源から発せられた前記紫外線を導入して前記出射面から出射する透光板とを備え、
    　前記紫外線を吸収して発光する蛍光部材が前記透光板の出射面上に形成されていることを特徴とする照明装置。     A light source that emits ultraviolet light;
    A light-transmitting plate that has an emission surface facing the illuminated body side, introduces the ultraviolet rays emitted from the light source, and emits the ultraviolet light from the emission surface;
    An illuminating device, wherein a fluorescent member that absorbs ultraviolet rays and emits light is formed on an emission surface of the translucent plate.
  2. 　前記紫外線で励起されて発光する複数種類の蛍光体を含むものが前記蛍光部材とされていることを特徴とする請求項１に記載の照明装置。 The illumination device according to claim 1, wherein the fluorescent member includes a plurality of types of phosphors that are excited by the ultraviolet rays to emit light.
  3. 　前記透光板の出射面のうち、第１出射面領域における前記紫外線の単位面積当たりの出射量が第２出射面領域における前記紫外線の単位面積当たりの出射量よりも多くなり、
    　前記第１出射面領域における前記蛍光部材の形成密度に対して前記第２出射面領域における前記蛍光部材の形成密度が高くなっていることを特徴とする請求項１または２に記載の照明装置。     Of the exit surface of the translucent plate, the output amount per unit area of the ultraviolet rays in the first exit surface region is larger than the exit amount per unit area of the ultraviolet rays in the second exit surface region,
    3. The lighting device according to claim 1, wherein a formation density of the fluorescent member in the second emission surface region is higher than a formation density of the fluorescent member in the first emission surface region.
  4. 　前記透光板の出射面が全面にわたって前記蛍光部材で覆われずに部分的に露出されていることを特徴とする請求項３に記載の照明装置。 4. The illumination device according to claim 3, wherein an exit surface of the translucent plate is partially exposed without being covered with the fluorescent member over the entire surface.
  5. 　前記蛍光部材が複数の島状部からなっており、
    　前記複数の島状部が分散して配置されていることを特徴とする請求項４に記載の照明装置。     The fluorescent member is composed of a plurality of island-shaped portions,
    The lighting device according to claim 4, wherein the plurality of island portions are arranged in a distributed manner.
  6. 　前記第１出射面領域から離れるにしたがって前記紫外線の単位面積当たりの出射量が徐々に少なくなっており、
    　前記第１出射面領域から離れるにしたがって前記複数の島状部の外形サイズが徐々に大きくなっていることを特徴とする請求項５に記載の照明装置。     The emission amount per unit area of the ultraviolet light gradually decreases as the distance from the first emission surface region increases.
    The lighting device according to claim 5, wherein an outer size of the plurality of island-shaped portions gradually increases as the distance from the first emission surface area increases.
  7. 　前記第１出射面領域から離れるにしたがって前記紫外線の単位面積当たりの出射量が徐々に少なくなっており、
    　前記第１出射面領域から離れるにしたがって前記複数の島状部の分散間隔が徐々に小さくなっていることを特徴とする請求項５に記載の照明装置。     The emission amount per unit area of the ultraviolet light gradually decreases as the distance from the first emission surface region increases.
    The illumination device according to claim 5, wherein a dispersion interval of the plurality of island-shaped portions is gradually reduced as the distance from the first emission surface area increases.
  8. 　前記蛍光部材が複数の線状部からなっており、
    　前記複数の線状部が格子状に配置されていることを特徴とする請求項４に記載の照明装置。     The fluorescent member is composed of a plurality of linear portions,
    The lighting device according to claim 4, wherein the plurality of linear portions are arranged in a grid pattern.
  9. 　前記第１出射面領域から離れるにしたがって前記紫外線の単位面積当たりの出射量が徐々に少なくなっており、
    　前記第１出射面領域から離れるにしたがって前記複数の線状部の線幅が徐々に大きくなっていることを特徴とする請求項８に記載の照明装置。     The emission amount per unit area of the ultraviolet light gradually decreases as the distance from the first emission surface region increases.
    The lighting device according to claim 8, wherein line widths of the plurality of linear portions gradually increase as the distance from the first emission surface area increases.
  10. 　前記第１出射面領域から離れるにしたがって前記紫外線の単位面積当たりの出射量が徐々に少なくなっており、
    　前記第１出射面領域から離れるにしたがって前記複数の線状部の隣接間隔が徐々に小さくなっていることを特徴とする請求項８に記載の照明装置。     The emission amount per unit area of the ultraviolet light gradually decreases as the distance from the first emission surface region increases.
    The lighting device according to claim 8, wherein an interval between the plurality of linear portions is gradually reduced as the distance from the first emission surface area increases.
  11. 　前記透光板の出射面が全面にわたって前記蛍光部材で覆われており、
    　前記第１出射面領域における前記蛍光部材の厚みに対して前記第２出射面領域における前記蛍光部材の厚みが大きくなっていることを特徴とする請求項３に記載の照明装置。     The emission surface of the translucent plate is covered with the fluorescent member over the entire surface,
    The lighting device according to claim 3, wherein a thickness of the fluorescent member in the second emission surface region is larger than a thickness of the fluorescent member in the first emission surface region.
  12. 　請求項１～１１のいずれかに記載の照明装置と、
    　前記照明装置からの光で照明される表示パネルとを備えていることを特徴とする表示装置。     The lighting device according to any one of claims 1 to 11,
    And a display panel illuminated with light from the illumination device.
PCT/JP2011/071808 2010-09-30 2011-09-26 Lighting apparatus and display device WO2012043438A1 (en)

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