WO2018159603A1 - Dispositif de source lumineuse de surface, dispositif d'affichage et dispositif électronique - Google Patents

Dispositif de source lumineuse de surface, dispositif d'affichage et dispositif électronique Download PDF

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Publication number
WO2018159603A1
WO2018159603A1 PCT/JP2018/007233 JP2018007233W WO2018159603A1 WO 2018159603 A1 WO2018159603 A1 WO 2018159603A1 JP 2018007233 W JP2018007233 W JP 2018007233W WO 2018159603 A1 WO2018159603 A1 WO 2018159603A1
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WO
WIPO (PCT)
Prior art keywords
light source
source device
light
sheet
heat conducting
Prior art date
Application number
PCT/JP2018/007233
Other languages
English (en)
Japanese (ja)
Inventor
信二 宮崎
幸太 米澤
正一 駒野
哲生 林
辻　潤一郎
大道 内田
宏一 竹村
和法 原田
隆士 大西
和英 廣田
和幸 大竹
Original Assignee
オムロン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2018019910A external-priority patent/JP2018147879A/ja
Application filed by オムロン株式会社 filed Critical オムロン株式会社
Priority to CN201880004827.6A priority Critical patent/CN110050227A/zh
Priority to KR1020197015887A priority patent/KR20190082268A/ko
Priority to US16/467,685 priority patent/US10816713B2/en
Publication of WO2018159603A1 publication Critical patent/WO2018159603A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F21V29/503—Cooling arrangements characterised by the adaptation for cooling of specific components of light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F21V29/508—Cooling arrangements characterised by the adaptation for cooling of specific components of electrical circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
    • 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

Definitions

  • the present invention relates to a surface light source device, a display device, and an electronic device.
  • the liquid crystal display device mounted on such an electronic device has a need for a narrower frame and a smaller thickness in order to obtain a larger display area with the same area.
  • an LED (Light Emitting Diode) package that emits white light is used as a light source, and a side light type (also referred to as an edge light method) light source using a light guide plate (also referred to as a light guide).
  • the device is used.
  • a heat radiating member, a lighting device, an electro-optical device, and an electronic device that can absorb the heat generated by the LED and increase the current that can flow through the LED have been proposed (see Patent Document 1).
  • it has been proposed to disperse heat so that excessive heat concentration in the electronic device can be avoided by providing a thermal diffusion layer such as graphite in the electronic device see Patent Document 2.
  • a plurality of light sources are arranged on the side of the light guide plate.
  • the distance between the light emitting area on the backlight unit and the light source is shortened.
  • the light emitting area becomes darker between the light source and the light source. Brightness unevenness occurs near the light source.
  • the pitch of the plurality of light sources arranged on the side of the light guide plate luminance unevenness near the light sources in the light emitting area is suppressed.
  • an object of the present invention is to provide a technique for improving the heat dissipation of a light source.
  • the present invention has a light source, a light guide surface on which light incident from the light source is incident, and a light guide plate that emits light incident from the light incident surface from the light exit surface, a wiring board, and a light exit surface.
  • a bottom portion having a bottom surface facing the opposite surface, a side wall erected on the outer periphery of the bottom surface, and a protrusion provided on the side wall and projecting to the bottom surface side, and accommodates a light source, a light guide plate, and a wiring board And a metal frame, wherein at least a part of the light source is disposed between the bottom and the protrusion, and the wiring board is disposed between the light source and the bottom.
  • the surface light source device of the present invention by disposing at least a part of the light source between the bottom and the protrusion, the heat of the light source is transmitted to the metal frame through the side wall and the bottom, and Heat is transmitted to the metal frame through the protrusions, so that the heat dissipation of the light source can be improved. Further, according to the surface light source device of the present invention, by disposing the wiring board between the light source and the bottom, the heat of the light source is transferred to the metal frame through the wiring board, thereby improving the heat dissipation of the light source. be able to.
  • the surface light source device may include a heat conducting member provided between the wiring board and the bottom. According to the surface light source device of the present invention, by providing a heat conducting member between the wiring board and the bottom, heat from the light source is transferred to the metal frame via the wiring board and the heat conducting member, thereby radiating heat from the light source. Can be improved.
  • the heat conducting member may extend between the light guide plate and the bottom.
  • the surface area of the heat conducting member is increased by extending the heat conducting member between the light guide plate and the bottom. As a result, the heat dissipation of the heat conducting member can be improved, and the heat dissipation of the light source can be improved.
  • the heat conductive member of the surface light source device may be a graphite sheet, a heat conductive tape, or a composite member composed of a graphite sheet and a heat conductive tape.
  • the graphite sheet has excellent heat conductivity in the horizontal direction and diffuses heat in the horizontal direction. Therefore, heat diffuses in the horizontal direction of the surface light source device, increasing the amount of heat transferred from the light source to the heat conducting member. The heat dissipation can be improved.
  • the thermal conductive tape has excellent thermal conductivity in the vertical direction and diffuses heat in the vertical direction, so that the amount of heat transferred from the light source to the metal frame through the thermal conductive member increases, improving the heat dissipation of the light source. be able to.
  • the wiring board may extend between the light guide plate and the bottom. According to the surface light source device of the present invention, the wiring board is extended to the space between the light guide plate and the bottom, so that the surface area of the wiring board is increased. Therefore, the heat of the light source easily escapes to the metal frame through the wiring board. Thus, the heat dissipation of the light source can be improved.
  • the side wall has a first inner surface that is continuous with the bottom surface
  • the protrusion has a second inner surface that is continuous with the first inner surface
  • the bottom surface, the first inner surface, and the second inner surface are It may be covered with an insulating member.
  • the bottom portion may have a through hole penetrating the bottom portion or a concave portion recessed toward the bottom surface from the surface opposite to the bottom surface.
  • the surface area of the metal frame is increased, so that the heat dissipation property of the metal frame can be improved and the heat dissipation property of the light source can be improved.
  • the metal frame may be formed of aluminum, an aluminum alloy, or stainless steel.
  • the metal frame may have a thermal conductivity of 130 W / m ⁇ K.
  • the proof stress of the metal frame may be 260 N / mm 2 or more.
  • the surface light source device includes a diffusion sheet provided on the light exit surface, a prism sheet provided on the diffusion sheet, a light shielding tape provided on the protrusion and the prism sheet, and a light shielding tape. And at least a portion of the protruding portion and at least a portion of the buffer member may overlap in the normal direction of the bottom surface.
  • the surface light source device according to the present invention may be provided with a spacer that is housed in a metal frame and is disposed adjacent to the protruding portion in a direction facing the side wall.
  • the surface light source device includes a diffusion sheet provided on the light exit surface, a prism sheet provided on the diffusion sheet, and a light shielding tape provided on the protrusion, the spacer, and the prism sheet.
  • a spacer may be arrange
  • the surface light source device includes a diffusion sheet provided on the light exit surface and a prism sheet provided on the diffusion sheet, and the spacer is formed between the protruding portion and the prism sheet in a direction facing the side wall. It may be disposed between and fixed to the diffusion sheet.
  • the surface light source device includes a diffusion sheet provided on the light exit surface, a prism sheet provided on the diffusion sheet, a light shielding tape provided on the protrusion and the prism sheet, and a light shielding tape. And at least a portion of the protruding portion and at least a portion of the buffer member may overlap in the normal direction of the bottom surface.
  • the spacer may have a light shielding property.
  • the display device includes the surface light source device according to the present invention and a display panel that receives light emitted from the surface light source device. Since such a display device includes the surface light source device according to the present invention, it is possible to provide a display device with improved heat dissipation of the light source.
  • the electronic device according to the present invention includes the display device according to the present invention. Since such an electronic device includes the surface light source device and the display device according to the present invention, it is possible to provide an electronic device with improved heat dissipation of the light source.
  • the heat dissipation of the light source can be improved.
  • FIG. 1 is a perspective view illustrating the configuration of the liquid crystal display device according to the embodiment.
  • FIG. 2 is a cross-sectional view of the surface light source device according to the embodiment.
  • FIG. 3A is a cross-sectional view of the sheet metal frame according to the embodiment.
  • FIG. 3B is a side view of the sheet metal frame according to the embodiment.
  • FIG. 4 is a cross-sectional view of a sheet metal according to a comparative example.
  • FIG. 5 is a perspective view of the sheet metal frame according to the embodiment.
  • FIG. 6 is a cross-sectional view of a surface light source device according to a comparative example.
  • FIG. 7 is a cross-sectional view of the surface light source device according to the embodiment.
  • FIG. 1 is a perspective view illustrating the configuration of the liquid crystal display device according to the embodiment.
  • FIG. 2 is a cross-sectional view of the surface light source device according to the embodiment.
  • FIG. 3A is a cross-sectional view of
  • FIG. 8A is a cross-sectional view of the surface light source device according to the embodiment.
  • FIG. 8B is a perspective view of the sheet metal frame according to the embodiment.
  • FIG. 9A is a cross-sectional view of the surface light source device according to the embodiment.
  • FIG. 9B is a cross-sectional view of the surface light source device according to the embodiment.
  • FIG. 10 is a diagram showing the properties of the metal material.
  • FIG. 11 is a diagram illustrating verification data of the maximum temperature on the FPC according to the embodiment.
  • FIG. 12A is a plan view of the diffusion sheet according to the embodiment.
  • FIG. 12B is a cross-sectional view of the surface light source device according to the embodiment.
  • FIG. 12C is an example when the surface light source device is viewed from the upper surface side.
  • FIG. 12D is an example when the surface light source device is viewed from the upper surface side.
  • FIG. 12E is an example when the surface light source device is viewed from the upper surface side.
  • FIG. 13 is a cross-sectional view of the surface light source device according to the embodiment.
  • FIG. 14 is a cross-sectional view of the surface light source device according to the embodiment.
  • FIG. 15 is a cross-sectional view of the surface light source device according to the embodiment.
  • the “display device” is described as a liquid crystal display device
  • the “surface light source device” is described as a backlight of the liquid crystal display device.
  • the “surface light source device” may be used for purposes other than the backlight, such as a front light disposed on the front surface of the display device using a display panel or electronic paper.
  • FIG. 1 is a perspective view illustrating the configuration of the liquid crystal display device according to the embodiment.
  • the liquid crystal display device includes a surface light source device 1 disposed as a backlight and a display panel 2 that receives light emitted from the surface light source device 1.
  • the display panel 2 displays an image by applying a voltage to the liquid crystal sandwiched between glass plates and increasing or decreasing the light transmittance.
  • the display panel 2 side may be described as the upper surface side, and the opposite surface side thereof may be described as the lower surface side.
  • FIG. 2 is a cross-sectional view of the surface light source device 1 according to the embodiment.
  • the surface light source device 1 includes a light guide plate 10, a light source 11, a flexible printed circuit board (hereinafter referred to as "FPC") 12, a sheet metal frame 13, an FPC fixing tape 14, a reflection sheet 15, a diffusion sheet 16, a prism sheet 17, and a light shielding.
  • FPC flexible printed circuit board
  • a double-sided tape 18, a heat conducting member 19 and a fixing tape 20 are provided.
  • the light guide plate 10 has a substantially flat plate shape and is made of a light-transmitting material such as polycarbonate resin or polymethyl methacrylate resin.
  • the light guide plate 10 includes a light introduction portion 10A and a light guide plate body 10B, and the light introduction portion 10A is integrally formed at the end of the light guide plate body 10B.
  • the light introducing portion 10A has a light incident surface 10C on which light is incident.
  • the light introducing portion 10A has a light incident surface 10C on the side. Therefore, the light incident surface 10 ⁇ / b> C is a part of the side surface of the light guide plate 10.
  • the light guide plate 10 has a light exit surface 10D that emits light incident from the light incident surface 10C, and the light exit surface 10D faces the display panel 2.
  • the light exit surface 10D of the light guide plate 10 is defined as the upper surface of the light guide plate 10
  • the surface 10E opposite to the light exit surface 10D of the light guide plate 10 is defined as the lower surface of the light
  • the light guide plate main body 10B has a thickness smaller than the maximum thickness of the light introducing portion 10A and is continuous with the light introducing portion 10A.
  • 10 A of light introducing parts have an inclined surface which inclines toward the light-guide plate main body 10B.
  • the height of the end portion of the light introducing portion 10A is equal to or higher than the height of the light exit window of the light source 11.
  • the light guide plate main body 10B is thinner than the light introducing portion 10A.
  • the embodiment is not limited to the shape of the light guide plate 10 illustrated in FIG. 2, and the light guide plate 10 according to the embodiment may have a flat plate shape that does not include the light introducing portion 10 ⁇ / b> A.
  • the light source 11 emits white light from the fluorescent part.
  • the light source 11 is, for example, an LED package, but a light source other than the LED package may be used.
  • the light source 11 is formed by sealing an LED chip, which is a light emitting element, with a translucent resin (resin layer) containing a phosphor.
  • the light source 11 is driven by power supplied from the FPC 12 and lights up.
  • the light source 11 is an example of a heat source. Note that an LED light source other than white may be used as the light source 11.
  • the light source 11 is arranged on the FPC 12 so that the light emitting surface of the light source 11 faces the light incident surface 10 ⁇ / b> C of the light guide plate 10. For example, a plurality of light sources 11 are mounted on the FPC 12 in a line at regular intervals.
  • the FPC 12 is configured by providing wiring with a conductive foil on a substrate that is a flexible insulating film, and bonding a coverlay or resin (photosensitive resin) that is a protective insulating film to the surface. It is a wiring board.
  • a light source 11 is disposed on the upper surface of the FPC 12, and wiring is provided on the upper surface of the FPC 12.
  • the upper surface of the FPC 12 faces the same direction as the upper surface of the light guide plate 10.
  • the upper surface of the FPC 12 is the upper surface of the substrate provided in the FPC 12.
  • the wiring on the upper surface of the FPC 12 is used for power supply to the light source 11 and the like.
  • the present invention is not limited to the case where wiring is provided on the upper surface of the FPC 12.
  • a wiring may be provided on the lower surface of the FPC 12.
  • the lower surface of the FPC 12 is the lower surface of the base material included in the FPC 12.
  • the wiring on the upper surface of the FPC 12 and the wiring on the lower surface of the FPC 12 are connected by a through hole (also referred to as TSV) penetrating the FPC 12, and the wiring on the lower surface of the FPC 12 is connected to the same wiring or other wiring on the upper surface of the FPC 12 by another through hole. You may connect to.
  • a wiring may be provided inside the FPC 12, and a through hole may be connected to the wiring inside the FPC 12. Further, a plurality of through holes may be connected to each other via wiring inside the FPC 12. In this case, one end of the through hole may stop inside the FPC 12 without penetrating the FPC 12.
  • the light source 11 is soldered to the wiring on the upper surface of the FPC 12, and the light source 11 and the FPC 12 are electrically connected.
  • a solder fillet 21 formed when the light source 11 is soldered to the FPC 12 is provided on the side surface of the light source 11.
  • Dummy wiring may be provided on the upper and lower surfaces of the FPC 12.
  • the dummy wiring is wiring that is not used for supplying power to the light source 11 or the like.
  • the dummy wiring on the upper surface of the FPC 12 and the dummy wiring on the lower surface of the FPC 12 are connected by a through hole penetrating the FPC 12.
  • the dummy wiring on the upper surface of the FPC 12 and the dummy wiring on the lower surface of the FPC 12 are connected by a through hole, and the dummy wiring on the lower surface of the FPC 12 is connected to the same dummy wiring or another dummy wiring on the upper surface of the FPC 12 by another through hole. May be.
  • a part of the FPC 12 passes through an opening provided in the sheet metal frame 13 and protrudes toward the outside of the surface light source device 1.
  • the sheet metal frame 13 accommodates the light guide plate 10, the light source 11, the FPC 12, the FPC fixing tape 14, the reflection sheet 15, the diffusion sheet 16, the prism sheet 17, the heat conducting member 19, and the fixing tape 20.
  • the sheet metal frame 13 has thermal conductivity, and is formed of, for example, aluminum, an aluminum alloy, stainless steel, or the like.
  • the sheet metal frame 13 is an example of a metal frame.
  • FIG. 3A is a cross-sectional view of the sheet metal frame 13 according to the embodiment.
  • the sheet metal frame 13 includes a bottom portion 32 having a bottom surface 31, a side wall 33 standing on a part of the outer periphery of the bottom surface 31, and a flange portion 34 provided on the side wall 33 and protruding toward the bottom surface 31.
  • the bottom portion 32 has a rectangular shape in plan view from the normal direction of the bottom surface 31, and a side wall 33 is erected on one side of the bottom portion 32 in the normal direction of the bottom surface 31.
  • the light source 11 is disposed between the bottom portion 32 and the flange portion 34.
  • a part of the light source 11 may be disposed between the bottom portion 32 and the flange portion 34, or an entire portion of the light source 11 may be disposed between the bottom portion 32 and the flange portion 34. Since the heat of the light source 11 is transmitted to the sheet metal frame 13 through the flange portion 34, the heat dissipation of the light source 11 is improved.
  • the collar portion 34 is an example of a protruding portion.
  • FIG. 3A is a side view of the sheet metal frame 13 according to the embodiment.
  • a side wall 37 connected to the bottom portion 32, the side wall 33, and the flange portion 34 is provided on the side surface of the sheet metal frame 13. The heat transmitted from the light source 11 to the flange portion 34 is transferred to the bottom portion 32 through the side walls 33, 37, and is radiated to the outside while spreading over the entire sheet metal frame 13.
  • the side wall 37 may be omitted from the sheet metal frame 13.
  • the side wall 33 has an inner surface 35 that is continuous with the bottom surface 31, and the flange portion 34 has an inner surface 36 that is continuous with the inner surface 35.
  • the inner surface 35 is an example of a first inner surface.
  • the inner surface 36 is an example of a second inner surface.
  • the bottom surface 31 and the inner surfaces 35 and 36 may be covered with the insulating member 22.
  • the bottom surface 31 and the inner surfaces 35 and 36 may be coated with insulation.
  • the heat of the light source 11 is transmitted to the bottom 32 and the flange 34 through the insulating member 22.
  • the entire bottom surface 31 and inner surfaces 35 and 36 may be covered by the insulating member 22, or the insulating member 22 may cover portions of the bottom surface 31 and inner surfaces 35 and 36 in the vicinity of the solder fillet 21. Further, the formation of the insulating member 22 may be omitted. In this case, the occurrence of a short in the solder fillet 21 may be avoided by sufficiently separating the distance between the sheet metal frame 13 and the solder fillet 21.
  • FIG. 4 is a cross-sectional view of a sheet metal 100 according to a comparative example.
  • the surface area of the sheet metal 100 with respect to the light source 11 is small.
  • the sheet metal frame 13 according to the embodiment since the bottom portion 32, the side wall 33, and the flange portion 34 are integrated, the surface area of the sheet metal frame 13 with respect to the light source 11 is larger than the surface area of the sheet metal 100 according to the comparative example. ing. Therefore, the heat dissipation of the sheet metal frame 13 according to the embodiment is improved. As shown in FIG.
  • the strength of the contact portion between the sheet metal 100 and the side wall 101 is insufficient.
  • the bottom portion 32, the side wall 33, and the flange portion 34 are integrated, so that the strength of the boundary portion between the bottom portion 32 and the side wall 33 is improved.
  • FIG. 5 is a perspective view of the sheet metal frame 13 according to the embodiment.
  • a resin frame 23 is provided on the outer peripheral portion of the sheet metal frame 13. Specifically, the resin frame 23 is erected on the three sides of the bottom portion 32 in the normal direction of the bottom surface 31.
  • the resin frame 23 is formed of a polycarbonate resin containing titanium oxide or a polycarbonate resin not containing titanium oxide.
  • the resin frame 23 surrounds the surface of the light guide plate 10 other than the light incident surface 10C.
  • the resin frame 23 has a high reflectance and reflects and reuses light leaked from the side surface of the light guide plate 10.
  • the FPC fixing tape 14 comes into contact with the light introducing portion 10 ⁇ / b> A of the light guide plate 10 and fixes the light guide plate 10 and the FPC 12.
  • the reflection sheet 15 is disposed in contact with the lower surface of the light guide plate 10.
  • the reflective sheet 15 is a highly reflective film having a multilayer film structure or a smooth sheet made of a highly reflective white resin sheet, metal foil, or the like, so that light in the light guide plate 10 does not leak from the lower surface of the surface light source device 1. To reflect light.
  • a diffusion sheet 16 and one or two prism sheets 17 are installed on the light guide plate 10.
  • the diffusion sheet 16 is a translucent resin film, and diffuses the light emitted from the light exit surface 10D of the light guide plate body 10B to widen the light directivity.
  • the prism sheet 17 is a transparent resin film having a triangular prism-like fine pattern formed on the upper surface, condenses the light diffused by the diffusion sheet 16, and the surface light source device 1 when viewed from the upper surface side. Increase brightness.
  • the light-shielding double-sided tape 18 is a black adhesive tape whose upper and lower surfaces are adhesive surfaces.
  • the light shielding double-sided tape 18 has a frame shape (ring shape).
  • the light-shielding double-sided tape 18 is disposed along the outer peripheral portion of the sheet metal frame 13 and suppresses light from leaking out of the surface light source device 1.
  • the fixing tape 20 fixes the heat conducting member 19 to the sheet metal frame 13.
  • the FPC 12 is disposed between the light source 11 and the bottom 32. A part of the upper surface of the FPC 12 is in contact with the light source 11, and the lower surface of the FPC 12 is in contact with the heat conducting member 19.
  • the heat conducting member 19 has heat conductivity.
  • the heat conductive member 19 is a graphite sheet or a heat conductive double-sided tape. The heat of the light source 11 is transmitted to the bottom 32 via the FPC 12 and the heat conducting member 19, so that the heat spreads over the entire sheet metal frame 13 and is radiated to the outside.
  • a thick arrow in FIG. 2 shows an example of a moving direction of heat transmitted from the light source 11 to the sheet metal frame 13.
  • the heat conductive member 19 may be a composite member composed of a graphite sheet and a heat conductive double-sided tape.
  • the center part of the heat conductive member 19 may be a graphite sheet
  • the outer peripheral part of the heat conductive member 19 may be a heat conductive double-sided tape.
  • the heat conductive member 19 may be a laminated member in which a graphite sheet and a heat conductive double-sided tape are laminated.
  • the graphite sheet of the heat conducting member 19 may contact the lower surface of the FPC 12
  • the heat conductive double-sided tape of the heat conducting member 19 may contact the bottom 32
  • the double-sided tape of the heat conducting member 19 may contact the lower surface of the FPC 12.
  • the graphite sheet of the heat conducting member 19 may contact the bottom portion 32.
  • the heat conducting member 19 is provided between the FPC 12 and the bottom portion 32, but the embodiment is not limited to the configuration example of the surface light source device 1 illustrated in FIG. 2. .
  • the heat conducting member 19 may not be provided between the FPC 12 and the bottom portion 32. In this case, the lower surface of the FPC 12 is in contact with the bottom 32. When the lower surface of the FPC 12 comes into contact with the bottom portion 32, the heat of the light source 11 is transmitted to the bottom portion 32 through the FPC 12, and the heat spreads to the entire sheet metal frame 13 and is radiated to the outside.
  • FIG. 6 is a cross-sectional view of a surface light source device 200 according to a comparative example.
  • the FPC 12 is provided on the light source 11, and the heat conducting member 19 is not provided on the sheet metal frame 201. Therefore, in the surface light source device 200 according to the comparative example, an air layer is formed between the FPC 12 and the sheet metal frame 201. Therefore, in the surface light source device 200 according to the comparative example, the heat transmitted from the light source 11 to the FPC 12 is transmitted to the sheet metal frame 201 through the air layer, so that the heat dissipation of the light source 11 is low.
  • a thick arrow in FIG. 6 shows an example of a moving direction of heat transferred from the FPC 12 to the sheet metal frame 201.
  • the graphite sheet 202 is pasted on the outer surface of the sheet metal frame 201.
  • the FPC 12 is disposed between the light source 11 and the bottom 32, and no air layer is formed between the FPC 12 and the bottom 32. Therefore, the heat of the light source 11 is easily transmitted to the sheet metal frame 13, and the heat dissipation of the light source 11 is improved. Moreover, according to the surface light source device 1 which concerns on embodiment, since the heat conductive member 19 is incorporated in the surface light source device 1, thickness reduction of the surface light source device 1 is achieved, and the surface light source device 1 of FIG. The shape is simple, and the processing of the surface light source device 1 is simplified.
  • the FPC 12 since the FPC 12 is disposed on the light source 11, if the length of the FPC 12 is increased toward the light guide plate 10, the FPC 12 jumps out of the light shielding double-sided tape 18. Therefore, it is necessary to make the length of the FPC 12 fall within the frame width W2 of the surface light source device 200.
  • the length of the FPC 12 cannot be increased because the length of the FPC 12 depends on the frame width W2 of the surface light source device 200.
  • the FPC 12 is disposed between the light source 11 and the bottom 32, so the length of the FPC 12 is the frame width W ⁇ b> 1 of the surface light source device 1. Does not depend on. Therefore, in the surface light source device 1 according to the embodiment, the length of the FPC 12 can be increased toward the light guide plate 10 side. By increasing the length of the FPC 12, the surface area of the FPC 12 is increased, so that the heat of the light source 11 easily escapes to the sheet metal frame 13 through the FPC 12, and the heat dissipation of the light source 11 is improved. In the surface light source device 1 according to the embodiment, the length of the FPC 12 can be arbitrarily set.
  • the FPC 12 may extend between the light guide plate 10 and the bottom portion 32, and the dummy wiring provided on the lower surface of the FPC 12 may extend between the light guide plate 10 and the bottom portion 32.
  • the embodiment is not limited to the configuration example of the surface light source device 1 illustrated in FIG. 2, and the FPC 12 may not extend between the light guide plate 10 and the bottom portion 32.
  • the FPC 12 has a thick portion and a thin portion, and the thin portion of the FPC 12 extends between the light guide plate 10 and the bottom portion 32.
  • the embodiment is not limited to the shape of the FPC 12 illustrated in FIG. 2, and the FPC 12 according to the embodiment may have a flat plate shape.
  • the graphite sheet has excellent thermal conductivity in the horizontal direction (the direction in which the graphite layer spreads), and diffuses heat in the horizontal direction.
  • heat is diffused in the horizontal direction of the surface light source device 1, and the amount of heat transferred from the light source 11 to the heat conducting member 19 is increased, so that the heat dissipation of the light source 11 is improved.
  • the horizontal direction of the surface light source device 1 is a direction orthogonal to the normal direction of the light exit surface 10D of the light guide plate body 10B.
  • Thermally conductive double-sided tape has excellent thermal conductivity in the vertical direction and diffuses heat in the vertical direction.
  • a heat conductive double-sided tape as the heat conductive member 19 the amount of heat transferred from the light source 11 to the sheet metal frame 13 through the heat conductive member 19 increases, so that the heat dissipation of the light source 11 is improved.
  • the FPC 12 can be fixed to the sheet metal frame 13, and the fixing tape 20 can be omitted.
  • a heat conductive single-sided tape may be used as the heat conductive member 19.
  • the heat conductive single-sided tape has excellent heat conductivity in the vertical direction and diffuses heat in the vertical direction.
  • a heat conductive double-sided tape and a heat conductive single-sided tape are examples of a heat conductive tape.
  • the length of the heat conducting member 19 can be arbitrarily set.
  • the heat conducting member 19 may be extended to between the light guide plate 10 and the bottom portion 32.
  • the surface area of the heat conducting member 19 is increased.
  • the heat dissipation of the heat conducting member 19 is improved, and the heat dissipation of the light source 11 is further improved.
  • the amount of heat diffused in the horizontal direction of the surface light source device 1 is increased, and the amount of heat transferred from the light source 11 to the heat conducting member 19 is further increased, thereby radiating heat from the light source 11. Improves.
  • the embodiment is not limited to the configuration example of the surface light source device 1 illustrated in FIG. 2, and the heat conducting member 19 may not extend between the light guide plate 10 and the bottom 32.
  • FIG. 7 is a cross-sectional view of the surface light source device 1 according to the embodiment.
  • the heat conductive member 19A is a graphite sheet, a heat conductive double-sided tape or a composite member composed of a graphite sheet and a heat conductive double-sided tape.
  • the heat conductive member 19B is a composite member composed of a graphite sheet, a heat conductive double-sided tape or a graphite sheet and a heat conductive double-sided tape.
  • the heat conducting members 19 ⁇ / b> A and 19 ⁇ / b> B may be fixed to the sheet metal frame 13 with the fixing tape 20.
  • the end of the heat conducting member 19A and the end of the heat conducting member 19B may be in contact with each other, or the end of the heat conducting member 19A and the end of the heat conducting member 19B may be separated from each other.
  • the heat conducting member 19A is an example of a first heat conducting member.
  • the heat conducting member 19B is an example of a second heat conducting member.
  • a support member 24 may be provided between the reflection sheet 15 and the heat conducting member 19B.
  • the support member 24 is a double-sided tape or a cushion material.
  • the support member 24 fixes the reflective sheet 15 and the heat conducting member 19.
  • An adhesive may be formed on both sides of the cushion material, and the reflective sheet 15 and the heat conducting member 19 may be fixed by an adhesive formed on the cushion material.
  • the cushion material is a sheet-like cushioning member.
  • the FPC 12 may extend between the light guide plate 10 and the bottom 32.
  • the heat conducting member 19 ⁇ / b> A may be extended between the light guide plate 10 and the bottom portion 32. Further, the FPC 12 may extend between the light guide plate 10 and the heat conducting member 19B. When the FPC 12 extends between the light guide plate 10 and the heat conducting member 19B, the FPC 12 may be in contact with the heat conducting member 19B, or the FPC 12 and the heat conducting member 19B are separated from each other. Also good.
  • a graphite sheet As the heat conducting member 19B, heat can be diffused in the longitudinal direction of the surface light source device 1. Therefore, the heat transmitted from the sheet metal frame 13 to the heat conducting member 19B can be diffused in the horizontal direction of the surface light source device 1. Further, when the FPC 12 is in contact with the heat conducting member 19 ⁇ / b> B, the heat transmitted from the FPC 12 to the heat conducting member 19 ⁇ / b> B can be diffused in the horizontal direction of the surface light source device 1.
  • FIG. 8A and 8B a plurality of holes 41 may be provided in the bottom 32.
  • FIG. 8A is a cross-sectional view of the surface light source device 1 according to the embodiment.
  • FIG. 8B is a perspective view of the sheet metal frame 13 according to the embodiment.
  • the hole 41 may be a through hole that penetrates the bottom portion 32.
  • the hole 41 may be a concave portion that does not penetrate the bottom portion 32 and is recessed from the surface 38 opposite to the bottom surface 31 of the bottom portion 32 toward the bottom surface 31.
  • the plurality of holes 41 may have the same shape and size, or the plurality of holes 41 may have different shapes and sizes.
  • the hole 41 in the bottom 32 By providing the hole 41 in the bottom 32, the surface area of the sheet metal frame 13 is increased, so that the heat dissipation of the sheet metal frame 13 is improved and the heat dissipation of the light source 11 is improved.
  • the plurality of holes 41 are provided in the bottom portion 32, but the embodiment is not limited to the configuration example of the sheet metal frame 13 illustrated in FIGS. 8A and 8B.
  • One hole 41 may be provided in the bottom 32.
  • the light source 11 and the hole 41 may overlap in a plan view from the normal direction of the bottom surface 31. Since the hole 41 provided in the bottom part 32 is located directly under the light source 11, the heat transmitted from the light source 11 to the sheet metal frame 13 is easily radiated to the outside.
  • the sheet metal frame 13 has an example of a single layer structure using one kind of metal of aluminum, aluminum alloy, or stainless steel, but the sheet metal frame 13 according to the embodiment is not limited to a single layer structure.
  • the sheet metal frame 13 according to the embodiment may have a clad structure (multiple layer structure) in which a plurality of different metals are laminated.
  • 9A and 9B are cross-sectional views of the surface light source device 1 according to the embodiment.
  • the sheet metal frame 13 shown in FIG. 9A is a two-layer material having sheet metal frames 13A and 13B.
  • the sheet metal frame 13A is, for example, stainless steel, and the sheet metal frame 13B is, for example, copper (Cu).
  • the rigidity of stainless steel is higher than that of copper, and the thermal conductivity of copper is higher than that of stainless steel.
  • the rigidity of the sheet metal frame 13 is improved.
  • the heat dissipation of the sheet metal frame 13 can be improved.
  • the sheet metal frame 13A and the sheet metal frame 13B may be joined by rolling joining.
  • the sheet metal frame 13 shown in FIG. 9B is a three-layer material having sheet metal frames 13A, 13B, and 13C.
  • the sheet metal frame 13A is, for example, stainless steel
  • the sheet metal frame 13B is copper
  • the sheet metal frame 13C is stainless steel.
  • Stainless steel is used for the sheet metal frame 13A that is the surface layer (outer layer) of the sheet metal frame 13
  • copper is used for the sheet metal frame 13B that is the intermediate layer of the sheet metal frame 13
  • stainless steel is used for the sheet metal frame 13C that is the inner layer of the sheet metal frame 13.
  • the heat dissipation of the sheet metal frame 13 can be improved while improving the rigidity of the sheet metal frame 13.
  • the sheet metal frame 13A and the sheet metal frame 13B may be joined by rolling joining, and the sheet metal frame 13B and the sheet metal frame 13C may be joined.
  • FIG. 10 is a diagram showing the properties of the metal material.
  • a metal material having the properties shown in FIG. 10 may be used as the material of the sheet metal frame 13 .
  • the material of the sheet metal frame 13 according to the embodiment is not limited to the metal material illustrated in FIG. 10, and other metal materials other than the metal material illustrated in FIG. 10 may be used as the sheet metal frame 13 according to the embodiment.
  • the thermal conductivity of aluminum B, aluminum alloy C, aluminum alloy E, and aluminum alloy F shown in FIG. 10 is 130 W / m ⁇ K or more. Therefore, from the viewpoint of heat dissipation of the surface light source device 1, it is preferable to use aluminum B, aluminum alloy C, aluminum alloy E, or aluminum alloy F shown in FIG.
  • the thermal conductivity of aluminum B, aluminum alloy E, and aluminum alloy F shown in FIG. 10 is 200 W / m ⁇ K or more. Therefore, from the viewpoint of heat dissipation of the surface light source device 1, it is more preferable to use aluminum B, aluminum alloy E, or aluminum alloy F shown in FIG.
  • the proof stress of stainless steel A, aluminum alloy D, and aluminum alloy F shown in FIG. 10 is 260 N / mm 2 or more. Therefore, from the viewpoint of the strength of the surface light source device 1, it is preferable to use stainless steel A, aluminum alloy D or aluminum alloy F shown in FIG.
  • the thermal conductivity of the aluminum alloy F shown in FIG. 10 is 130 W / m ⁇ K or more, and the proof stress of the aluminum alloy F shown in FIG. 10 is 260 N / mm 2 or more. Therefore, from the viewpoint of heat dissipation and strength of the surface light source device 1, it is preferable to use an aluminum alloy F shown in FIG.
  • FIG. 11 is a diagram illustrating verification data of the maximum temperature on the FPC 12 of the surface light source device 1 according to the embodiment. 11 indicates the maximum temperature (° C.) on the FPC 12, and the horizontal axis in FIG. 11 indicates the elapsed time (min) after the light source 11 is turned on.
  • the surface light source devices 1 of Samples A and B shown in FIG. 11 stainless steel is used as the material of the sheet metal frame 13, and the thickness of the sheet metal frame 13 is 0.10 mm.
  • an aluminum alloy is used as the material of the sheet metal frame 13, and the thickness of the sheet metal frame 13 is 0.15 mm.
  • the surface light source device 1 of sample A shown in Fig. 11 does not include the heat conducting members 19, 19A, 19B. That is, the surface light source device 1 of sample A shown in FIG. 11 has a structure in which the FPC 12 and the bottom 32 are in contact with each other.
  • a surface light source device 1 of Sample B shown in FIG. 11 includes heat conducting members 19A and 19B. That is, in the surface light source device 1 of Sample B shown in FIG. 11, the heat conduction member 19 ⁇ / b> A is disposed between the FPC 12 and the bottom portion 32, and the heat conduction member 19 ⁇ / b> B is disposed between the light guide plate 10 and the bottom portion 32. It is a structure.
  • the heat conducting member 19A is a heat conducting double-sided tape
  • the heat conducting member 19B is a graphite sheet
  • the thickness of the heat conducting member 19B is 50 mm.
  • the surface light source device 1 of the sample C shown in FIG. 11 does not include the heat conducting members 19A and 19B. That is, the surface light source device 1 of the sample C shown in FIG. 11 has a structure in which the FPC 12 and the bottom 32 are in contact with each other.
  • the surface light source device 1 of the sample D shown in FIG. That is, the surface light source device 1 of the sample D shown in FIG. 11 has a structure in which the heat conduction member 19 is disposed between the FPC 12 and the bottom portion 32.
  • the heat conducting member 19 is a heat conducting double-sided tape.
  • the heat conduction member 19 has a structure in which the heat conduction member 19 is disposed between the FPC 12 and the bottom portion 32.
  • the heat conducting member 19 is a graphite sheet, and the thickness of the heat conducting member 19 is 5 mm.
  • the maximum temperature on the FPC 12 was about 63 ° C. when 5 minutes (min) elapsed after the light source 11 was turned on. With respect to the surface light source device 1 of Sample B shown in FIG. 11, it was confirmed that the maximum temperature on the FPC 12 was about 45 ° C. when 5 minutes (min) elapsed after the light source 11 was turned on.
  • a thermally conductive double-sided tape is disposed between the FPC 12 and the bottom portion 32, and a graphite sheet is disposed between the light guide plate 10 and the bottom portion 32.
  • the maximum temperature can be reduced by about 18 ° C.
  • the maximum temperature on the FPC 12 was about 40 ° C.
  • the maximum temperature on the FPC 12 was about 37 ° C. when 5 minutes (min) elapsed after the light source 11 was turned on.
  • the maximum temperature on the FPC 12 was about 36 ° C. after 5 minutes (min) had elapsed since the light source 11 was turned on.
  • the maximum temperature on the FPC 12 can be lowered by about 23 ° C. by changing the material of the sheet metal frame 13 from stainless steel to aluminum alloy.
  • the maximum temperature on the FPC 12 can be lowered by about 3 ° C. by disposing a heat conductive double-sided tape between the FPC 12 and the bottom 32.
  • the maximum temperature on the FPC 12 can be lowered by about 4 ° C. by disposing a graphite sheet between the FPC 12 and the bottom 32.
  • the end 16A of the diffusion sheet 16 may be printed in black, or a black member may be provided on the end 16A of the diffusion sheet 16.
  • the black member may be, for example, PET (polyethylene terephthalate) subjected to black printing.
  • PET polyethylene terephthalate
  • the strong light from the light source 11 may be directly visible from the upper surface side without being blocked by the light-shielding double-sided tape 18. Thick arrows in FIG. 12B indicate an example of the direction of light emitted from the light source 11.
  • FIG. 12C to FIG. 12E are examples when the surface light source device 1 is viewed from the upper surface side.
  • the end portion 16A of the diffusion sheet 16 is printed in white
  • the end portion 16A of the diffusion sheet 16 is not printed in black
  • the black member is not provided in the end portion 16A of the diffusion sheet 16.
  • the end portion 16A of the diffusion sheet 16 is printed in black.
  • a black member is provided at the end 16 ⁇ / b> A of the diffusion sheet 16. As shown in FIGS. 12C to 12E, the strong light from the light source 11 is shielded by printing the end portion 16A of the diffusion sheet 16 in white or by providing a black member on the end portion 16A of the diffusion sheet 16.
  • the heat of the light source 11 is transmitted to the sheet metal frame 13 through the flange 34 by projecting the flange 34 that is a part of the sheet metal frame 13 toward the bottom surface 31 side.
  • the heat dissipation of the light source 11 is improved.
  • the FPC 12 is disposed between the light source 11 and the bottom portion 32, and an air layer is not formed between the FPC 12 and the bottom portion 32.
  • the heat dissipation of the light source 11 is improved by being transmitted to the sheet metal frame 13 via the. Therefore, a liquid crystal display device with improved heat dissipation can be provided by mounting such a surface light source device 1 as a backlight.
  • FIG. 13 is a cross-sectional view of the surface light source device 1 according to the embodiment.
  • FIG. 13 shows a cross-sectional view seen from the Y direction.
  • a diffusion sheet 16 is provided on the light exit surface 10 ⁇ / b> D of the light guide plate 10.
  • the surface light source device 1 includes two prism sheets 17, a lower prism sheet 17 ⁇ / b> A is provided on the diffusion sheet 16, and an upper prism sheet 17 ⁇ / b> B is provided on the lower prism sheet 17 ⁇ / b> A.
  • the surface light source device 1 includes a spacer 51 disposed adjacent to the flange portion 34 in a direction facing the side wall 33. In the example of FIG.
  • the direction facing the side wall 33 is the X direction.
  • the spacer 51 is accommodated in the sheet metal frame 13.
  • the width of the spacer 51 in the Y direction is the same as or substantially the same as the width of the flange 34 in the Y direction. Further, the width of the spacer 51 in the Y direction may be smaller than the width of the flange portion 34 in the Y direction.
  • the normal direction of the bottom surface 31 is the Z direction
  • the direction orthogonal to the Z direction and orthogonal to the X direction is the Y direction.
  • the spacer 51 is thicker than the lower prism sheet 17A and the upper prism sheet 17B.
  • a light-shielding double-sided tape 18 is provided on the upper prism sheet 17B, the spacer 51, and the flange 34.
  • the light shielding double-sided tape 18 is an example of a light shielding tape.
  • the light-shielding double-sided tape 18 is attached to the upper surface of the upper prism sheet 17 ⁇ / b> B, the upper surface of the spacer 51, and the upper surface of the flange portion 34.
  • the upper surface of the upper prism sheet 17B, the upper surface of the spacer 51, and the upper surface of the flange portion 34 face the same direction as the bottom surface 31.
  • the height from the bottom surface 31 to the top surface of the flange portion 34 may coincide with the height from the bottom surface 31 to the top surface of the spacer 51.
  • the height from the bottom surface 31 to the top surface of the spacer 51 may be higher than the height from the bottom surface 31 to the top surface of the flange portion 34, or may be lower than the height from the bottom surface 31 to the top surface of the flange portion 34.
  • the height from the bottom surface 31 to the upper surface of the spacer 51 may coincide with the height from the bottom surface 31 to the upper surface of the upper prism sheet 17B.
  • the height from the bottom surface 31 to the upper surface of the spacer 51 may be higher than the height from the bottom surface 31 to the upper surface of the upper prism sheet 17B, or may be lower than the height from the bottom surface 31 to the upper surface of the upper prism sheet 17B. Good.
  • a buffer member 52 is provided on the light-shielding double-sided tape 18.
  • the flange 34 and the buffer member 52 overlap in the normal direction of the bottom surface 31.
  • at least a portion of the flange portion 34 and at least a portion of the buffer member 52 may overlap in the normal direction of the bottom surface 31.
  • the buffer member 52 is a base material having cushioning properties such as a sponge member, a rubber member, or a resin member, for example.
  • the buffer member 52 may have a tape shape.
  • the surface light source device 1 includes the spacer 51 and the buffer member 52, but not limited to the example of FIG. 13, the surface light source device 1 may include any one of the spacer 51 and the buffer member 52. Good.
  • the upper prism sheet 17 ⁇ / b> B and the collar part 34 are fixed to the light-shielding double-sided tape 18.
  • the spacer 51 is fixed to at least one of the diffusion sheet 16 and the light shielding double-sided tape 18.
  • the light shielding double-sided tape 18 has adhesiveness.
  • the spacer 51 may be fixed to the light-shielding double-sided tape 18 by attaching the spacer 51 to the light-shielding double-sided tape 18.
  • the spacer 51 is disposed between the flange portion 34 and the prism sheet 17 (17 ⁇ / b> A, 17 ⁇ / b> B) in the direction facing the side wall 33.
  • the diffusion sheet 16 may extend between the light source 11 and the light-shielding double-sided tape 18, and the spacer 51 may be fixed to the diffusion sheet 16.
  • the spacer 51 may be fixed to the diffusion sheet 16 by sticking an adhesive double-sided tape to the lower surface of the spacer 51.
  • the lower surface of the spacer 51 is the opposite surface of the upper surface of the spacer 51 and faces the bottom surface 31.
  • the spacer 51 may be a light-shielding member.
  • the spacer 51 may be, for example, PET subjected to black printing. Since the spacer 51 has a light shielding property, the leakage of light to the outside of the surface light source device 1 is further suppressed.
  • the buffer member 52 is fixed to the light-shielding double-sided tape 18.
  • the buffer member 52 is fixed to the light shielding double-sided tape 18 by affixing the buffer member 52 to the light shielding double-sided tape 18.
  • the width of the buffer member 52 in the Y direction is the same as or substantially the same as the width of the flange portion 34 in the Y direction. Further, the width of the buffer member 52 in the Y direction may be smaller than the width of the flange portion 34 in the Y direction.
  • FIG. 14 is a cross-sectional view of the surface light source device 1 according to the embodiment.
  • FIG. 14 shows a cross-sectional view viewed from the Y direction.
  • a diffusion sheet 16 is provided on the light exit surface 10 ⁇ / b> D of the light guide plate 10.
  • the surface light source device 1 includes two prism sheets 17, a lower prism sheet 17A is provided on the diffusion sheet 16, and an upper prism sheet 17B is provided on the lower prism sheet 17A.
  • the surface light source device 1 includes a spacer 53 that is disposed adjacent to the flange portion 34 in a direction facing the side wall 33. In the example of FIG. 14, the direction facing the side wall 33 is the X direction.
  • the spacer 53 is accommodated in the sheet metal frame 13.
  • the spacer 53 constitutes a part of the lower prism sheet 17A. Accordingly, the spacer 53 is integral with the lower prism sheet 17A.
  • the width of the spacer 53 in the Y direction is the same as or substantially the same as the width of the flange 34 in the Y direction. Further, the width of the spacer 53 in the Y direction may be smaller than the width of the flange portion 34 in the Y direction.
  • the normal direction of the bottom surface 31 is the Z direction
  • the direction orthogonal to the Z direction and orthogonal to the X direction is the Y direction.
  • the spacer 53 is thicker than the lower prism sheet 17A and the upper prism sheet 17B.
  • the light-shielding double-sided tape 18 is provided on the upper prism sheet 17B, the spacer 53, and the flange 34.
  • the light-shielding double-sided tape 18 is attached to the upper surface of the upper prism sheet 17 ⁇ / b> B, the upper surface of the spacer 53, and the upper surface of the flange portion 34.
  • the upper surface of the upper prism sheet 17B, the upper surface of the spacer 53, and the upper surface of the flange portion 34 face the same direction as the bottom surface 31.
  • the height from the bottom surface 31 to the top surface of the flange portion 34 may coincide with the height from the bottom surface 31 to the top surface of the spacer 53.
  • the height from the bottom surface 31 to the top surface of the spacer 53 may be higher than the height from the bottom surface 31 to the top surface of the flange portion 34, or may be lower than the height from the bottom surface 31 to the top surface of the flange portion 34.
  • the height from the bottom surface 31 to the upper surface of the spacer 53 may coincide with the height from the bottom surface 31 to the upper surface of the upper prism sheet 17B.
  • the height from the bottom surface 31 to the upper surface of the spacer 53 may be higher than the height from the bottom surface 31 to the upper surface of the upper prism sheet 17B, or may be lower than the height from the bottom surface 31 to the upper surface of the upper prism sheet 17B. Good.
  • a buffer member 52 is provided on the light-shielding double-sided tape 18.
  • the buffer member 52 is fixed to the light-shielding double-sided tape 18.
  • the flange portion 34 and the buffer member 52 overlap in the normal direction of the bottom surface 31.
  • at least a portion of the flange portion 34 and at least a portion of the buffer member 52 may overlap in the normal direction of the bottom surface 31.
  • the surface light source device 1 includes the buffer member 52 and the spacer 53, but not limited to the example of FIG. 14, the surface light source device 1 may include either the buffer member 52 or the spacer 53. Good.
  • the upper prism sheet 17 ⁇ / b> B and the collar portion 34 are fixed to the light-shielding double-sided tape 18.
  • the spacer 53 is fixed to at least one of the diffusion sheet 16 and the light shielding double-sided tape 18.
  • the spacer 53 may be fixed to the light-shielding double-sided tape 18 by attaching the spacer 53 to the light-shielding double-sided tape 18.
  • the spacer 53 is disposed between the flange portion 34 and the prism sheet 17 (17 ⁇ / b> A, 17 ⁇ / b> B) in the direction facing the side wall 33.
  • the diffusion sheet 16 may extend between the light source 11 and the light-shielding double-sided tape 18, and the spacer 53 may be fixed to the diffusion sheet 16.
  • the spacer 53 may be fixed to the diffusion sheet 16 by sticking an adhesive double-sided tape to the lower surface of the spacer 53.
  • the lower surface of the spacer 53 is the opposite surface of the upper surface of the spacer 53 and faces the bottom surface 31.
  • FIG. 15 is a cross-sectional view of the surface light source device 1 according to the embodiment.
  • FIG. 15 shows a cross-sectional view seen from the Y direction.
  • a diffusion sheet 16 is provided on the light exit surface 10 ⁇ / b> D of the light guide plate 10.
  • the surface light source device 1 includes two prism sheets 17, a lower prism sheet 17A is provided on the diffusion sheet 16, and an upper prism sheet 17B is provided on the lower prism sheet 17A.
  • the surface light source device 1 includes a spacer 54 that is disposed adjacent to the flange portion 34 in a direction facing the side wall 33. In the example of FIG. 15, the direction facing the side wall 33 is the X direction.
  • the spacer 54 is accommodated in the sheet metal frame 13.
  • the spacer 54 constitutes a part of the upper prism sheet 17B. Therefore, the spacer 54 is integral with the upper prism sheet 17B.
  • the width of the spacer 54 in the Y direction is the same as or substantially the same as the width of the flange 34 in the Y direction. Further, the width of the spacer 54 in the Y direction may be smaller than the width of the flange portion 34 in the Y direction.
  • the normal direction of the bottom surface 31 is the Z direction
  • the direction orthogonal to the Z direction and orthogonal to the X direction is the Y direction.
  • the spacer 54 is thicker than the lower prism sheet 17A and the upper prism sheet 17B.
  • the light-shielding double-sided tape 18 is provided on the upper prism sheet 17B, the spacer 54, and the flange 34.
  • the light-shielding double-sided tape 18 is attached to the upper surface of the upper prism sheet 17 ⁇ / b> B, the upper surface of the spacer 54, and the upper surface of the flange portion 34.
  • the upper surface of the upper prism sheet 17B, the upper surface of the spacer 54, and the upper surface of the flange portion 34 face the same direction as the bottom surface 31.
  • the height from the bottom surface 31 to the top surface of the flange portion 34 may coincide with the height from the bottom surface 31 to the top surface of the spacer 54.
  • the height from the bottom surface 31 to the top surface of the spacer 54 may be higher than the height from the bottom surface 31 to the top surface of the flange portion 34, or may be lower than the height from the bottom surface 31 to the top surface of the flange portion 34.
  • the height from the bottom surface 31 to the upper surface of the spacer 54 may coincide with the height from the bottom surface 31 to the upper surface of the upper prism sheet 17B.
  • the height from the bottom surface 31 to the upper surface of the spacer 54 may be higher than the height from the bottom surface 31 to the upper surface of the upper prism sheet 17B, or may be lower than the height from the bottom surface 31 to the upper surface of the upper prism sheet 17B. Good.
  • a buffer member 52 is provided on the light-shielding double-sided tape 18.
  • the buffer member 52 is fixed to the light-shielding double-sided tape 18.
  • the flange 34 and the buffer member 52 overlap in the normal direction of the bottom surface 31.
  • at least a portion of the flange portion 34 and at least a portion of the buffer member 52 may overlap in the normal direction of the bottom surface 31.
  • the surface light source device 1 includes the buffer member 52 and the spacer 54, but not limited to the example of FIG. 15, the surface light source device 1 may include any one of the buffer member 52 and the spacer 54. Good.
  • the upper prism sheet 17 ⁇ / b> B and the collar part 34 are fixed to the light-shielding double-sided tape 18.
  • the spacer 54 is fixed to at least one of the diffusion sheet 16 and the light shielding double-sided tape 18.
  • the spacer 54 may be fixed to the light-shielding double-sided tape 18 by attaching the spacer 54 to the light-shielding double-sided tape 18.
  • the spacer 54 is disposed between the flange portion 34 and the prism sheet 17 (17 ⁇ / b> A, 17 ⁇ / b> B) in the direction facing the side wall 33.
  • the diffusion sheet 16 may extend between the light source 11 and the light-shielding double-sided tape 18, and the spacer 54 may be fixed to the diffusion sheet 16.
  • the spacer 54 may be fixed to the diffusion sheet 16 by sticking an adhesive double-sided tape to the lower surface of the spacer 54.
  • the lower surface of the spacer 54 is the opposite surface of the upper surface of the spacer 53 and faces the bottom surface 31.
  • Such a liquid crystal display device can be mounted on various electronic devices.
  • a smart phone a digital camera, a tablet terminal, an electronic book, a wearable device, a car navigation device, an electronic dictionary, an electronic advertisement board, etc. can be illustrated.
  • Such an electronic device can be reduced in size and thickness, and can be expected to improve heat dissipation of the electronic device.

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  • Liquid Crystal (AREA)

Abstract

Le problème décrit par la présente invention est d'obtenir une technique permettant d'améliorer les propriétés de dissipation de la chaleur d'une source lumineuse. Un dispositif de source lumineuse de surface selon la présente invention comprend : une source lumineuse ; une plaque de guidage de lumière qui a une surface d'entrée de lumière, sur laquelle la lumière émise par la source lumineuse est incidente, sur un côté latéral et qui décharge la lumière incidente sur la surface d'entrée de lumière à partir d'une surface de sortie de lumière ; un substrat de câblage ; et un cadre métallique qui comprend une partie inférieure ayant une surface inférieure faisant face à une surface sur le côté inverse de la surface de sortie de lumière, une paroi latérale se tient sur la périphérie externe de la surface inférieure et une partie de projection est disposée sur la paroi latérale et fait saillie vers la surface inférieure, et qui contient la source lumineuse, la plaque de guidage de lumière et le substrat de câblage. Au moins une partie de la source lumineuse est disposée entre la partie inférieure et la partie de projection. Le substrat de câblage est disposé entre la source lumineuse et la partie inférieure.
PCT/JP2018/007233 2017-03-02 2018-02-27 Dispositif de source lumineuse de surface, dispositif d'affichage et dispositif électronique WO2018159603A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201880004827.6A CN110050227A (zh) 2017-03-02 2018-02-27 面光源装置、显示装置及电子设备
KR1020197015887A KR20190082268A (ko) 2017-03-02 2018-02-27 면 광원 장치, 표시 장치 및 전자 기기
US16/467,685 US10816713B2 (en) 2017-03-02 2018-02-27 Surface light source device, display device, and electronic device

Applications Claiming Priority (4)

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JP2017-039567 2017-03-02
JP2017039567 2017-03-02
JP2018019910A JP2018147879A (ja) 2017-03-02 2018-02-07 面光源装置、表示装置、及び電子機器
JP2018-019910 2018-02-07

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020093900A1 (fr) * 2018-11-05 2020-05-14 深圳Tcl新技术有限公司 Module d'affichage et dispositif d'affichage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011060619A (ja) * 2009-09-11 2011-03-24 Hitachi Consumer Electronics Co Ltd 液晶表示装置
WO2012001998A1 (fr) * 2010-06-30 2012-01-05 シャープ株式会社 Appareil d'éclairage et appareil d'affichage d'images doté de celui-ci
JP2014149386A (ja) * 2013-01-31 2014-08-21 Sharp Corp 液晶表示装置
JP2016081785A (ja) * 2014-10-17 2016-05-16 オムロン株式会社 面光源装置、表示装置、及び電子機器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011060619A (ja) * 2009-09-11 2011-03-24 Hitachi Consumer Electronics Co Ltd 液晶表示装置
WO2012001998A1 (fr) * 2010-06-30 2012-01-05 シャープ株式会社 Appareil d'éclairage et appareil d'affichage d'images doté de celui-ci
JP2014149386A (ja) * 2013-01-31 2014-08-21 Sharp Corp 液晶表示装置
JP2016081785A (ja) * 2014-10-17 2016-05-16 オムロン株式会社 面光源装置、表示装置、及び電子機器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020093900A1 (fr) * 2018-11-05 2020-05-14 深圳Tcl新技术有限公司 Module d'affichage et dispositif d'affichage

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