WO2019142620A1 - Dispositif source de lumière de surface, dispositif d'affichage et dispositif électronique - Google Patents

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

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Publication number
WO2019142620A1
WO2019142620A1 PCT/JP2018/047594 JP2018047594W WO2019142620A1 WO 2019142620 A1 WO2019142620 A1 WO 2019142620A1 JP 2018047594 W JP2018047594 W JP 2018047594W WO 2019142620 A1 WO2019142620 A1 WO 2019142620A1
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WO
WIPO (PCT)
Prior art keywords
light source
light
source device
bottom plate
plate
Prior art date
Application number
PCT/JP2018/047594
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English (en)
Japanese (ja)
Inventor
正一 駒野
哲生 林
貴宝 肖
義貴 武内
韋廷 陳
Original Assignee
オムロン株式会社
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Filing date
Publication date
Application filed by オムロン株式会社 filed Critical オムロン株式会社
Publication of WO2019142620A1 publication Critical patent/WO2019142620A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • 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
    • F21V19/00—Fastening of light sources or lamp holders

Definitions

  • the present invention relates to a surface light source device, a display device, and an electronic device.
  • FIG. 12 is a schematic cross-sectional view of a conventional surface light source device 100.
  • the surface light source device 100 includes a light guide plate 101, a light source 102 disposed adjacent to the light guide plate 101, and a reflective sheet 103 disposed below the light guide plate 101 and the light source 102.
  • the surface light source device 100 includes a housing 104 that accommodates the light guide plate 101, the light source 102, and the reflective sheet 103.
  • the housing 104 is composed of a bezel (metal frame) 105 and a resin frame 106.
  • the light source 102 is mounted on a flexible printed circuit board (hereinafter also referred to as “FPC”) 107.
  • the FPC 107 is fixed to the light guide plate 101 and the resin frame 106 by the double-sided adhesive tape 108.
  • the double-sided pressure-sensitive adhesive tape 108 is used for fixing components because it is excellent in mass productivity and thin.
  • a cover member with a substantially U-shaped cross-section is covered with a rod-like light source and a light guide plate, and the strong spring force of the cover member firmly supports the light guide plate to maintain the adhesion between the light guide plate and the bar light source
  • Patent Document 1 A surface light emitting device is proposed (see Patent Document 1).
  • FIG. 13 is a cross-sectional view of a conventional surface light source device 100 and a liquid crystal display 111. As shown in FIG. The liquid crystal display 111 has an upper glass 112 and a lower glass 113. In FIG.
  • the liquid crystal display 111 is fixed to the FPC 107 by the light shielding double-sided tape 114, and the surface light source device 100 and the liquid crystal display 111 are connected by the main FPC 115.
  • the main FPC 115 is bent 180 degrees and attached to the rear surface of the housing 104. Since the resilience of the main FPC 115 is large, stress is applied to the double-sided adhesive tape 108 by pulling the FPC 107 to the liquid crystal display 111 side. In addition, when the electronic device including the surface light source device 100 and the liquid crystal display 111 falls and an impact is applied to the electronic device, stress is applied to the double-sided adhesive tape 108.
  • the FPC 107 may peel off from the resin frame 106 or the FPC 107 may peel off from the light guide plate 101 due to the decrease in the adhesive strength of the double-sided adhesive tape 108 and the stress applied to the double-sided adhesive tape 108.
  • the occurrence of waviness on the surface of the resin frame 106 due to thin-wall molding increases the possibility of peeling the FPC 107 from the resin frame 106.
  • FIG. 14 when the FPC 107 is peeled from the resin frame 106, light may leak to the outside of the surface light source device 100. As shown in FIG.
  • an object of the present invention is to suppress peeling of a wiring board from a light guide plate and a frame.
  • the present invention adopts the following means in order to solve the above problems. That is, according to the present invention, a bottom plate, a side wall standing on the bottom plate and a side wall provided on the bottom plate, and a holding portion having a top plate facing the bottom plate and a light emitting surface disposed between the bottom plate and the top plate and emitting light
  • a light source having a light source, a light incident surface facing the light emitting surface, and a light incident surface on the side, and a light guide plate that emits light incident from the light incident surface from the light output surface, and a light source and a light guide plate
  • Surface light source device comprising a frame, a wiring board disposed between the top plate and the light source and fixed to the light guide plate and the frame, and a light shielding tape fixed to the opposite surface of the top plate opposite to the bottom plate It is.
  • the wiring substrate disposed between the bottom plate and the top plate is fixed to the light guide plate and the frame, and the light shielding tape is fixed to the top plate.
  • the light shielding tape is pulled, the top plate is pulled, but since the top plate is not fixed to the wiring substrate, the wiring substrate is not pulled. Therefore, even when the light shielding tape is pulled, the wiring substrate is not pulled, so the peeling of the wiring substrate from the light guide plate is suppressed and the peeling of the wiring substrate from the frame is suppressed.
  • the frame may have a protrusion which protrudes in a direction away from the light guide plate, and the protrusion may be fitted in a through hole provided in the bottom plate.
  • the protrusion may be accommodated in the through hole.
  • the tip of the top plate and the tip of the bottom plate may be bent by hemming.
  • the surface light source device according to the present invention may include a buffer member disposed between the top plate and the wiring substrate.
  • the wiring substrate may be fixed to the light guide plate and the frame by an adhesive tape.
  • the display device may include the surface light source device according to the present invention and a display panel that receives light emitted from the surface light source device, and the display panel may be fixed to the light shielding tape.
  • the electronic device may include the display device according to the present invention.
  • FIG. 1 is a cross-sectional view showing an example of a surface light source device.
  • FIG. 2 is a perspective view illustrating an example of the liquid crystal display device according to the first embodiment.
  • FIG. 3 is a cross-sectional view showing an example of the surface light source device according to the first embodiment.
  • FIG. 4A is a schematic view of a protrusion.
  • FIG. 4B is a schematic view of the protrusion.
  • FIG. 5A is a schematic view of the surface light source device according to the first embodiment.
  • FIG. 5B is a schematic view of the surface light source device according to the first embodiment.
  • FIG. 5C is a schematic view of the surface light source device according to the first embodiment.
  • FIG. 5D is a schematic view of the surface light source device according to the first embodiment.
  • FIG. 6 is a cross-sectional view showing an example of the surface light source device according to the first embodiment.
  • FIG. 7 is a cross-sectional view showing an example of the surface light source device according to the first embodiment.
  • FIG. 8A is a perspective view of a holder according to the first embodiment.
  • FIG. 8B is a cross-sectional view of the holding unit according to the first embodiment.
  • FIG. 8C is a cross-sectional view of the holder according to the first embodiment.
  • FIG. 9A is an explanatory view of a method of attaching the holder to the surface light source device.
  • FIG. 9B is an explanatory diagram of a method of attaching the holder to the surface light source device.
  • FIG. 9C is an explanatory diagram of a method of attaching the holder to the surface light source device.
  • FIG. 10 is a cross-sectional view of the liquid crystal display device according to the first embodiment.
  • FIG. 11 is a cross-sectional view showing an example of the surface light source device according to the second embodiment.
  • FIG. 12 is a schematic cross-sectional view of a conventional surface light source device.
  • FIG. 13 is a cross-sectional view of a conventional surface light source device and a liquid crystal display.
  • FIG. 14 is a cross-sectional view of a conventional surface light source device.
  • FIG. 15 is a cross-sectional view of a conventional surface light source device.
  • FIG. 1 is a cross-sectional view showing an example of the surface light source device 1.
  • the surface light source device 1 includes a light guide plate 10, a light source 11, an FPC 12, a reflection sheet 13, a housing 14, double-sided adhesive tapes 15 and 16, a holding unit 17, and a light shielding double-sided tape 18.
  • the light guide plate 10 has a light incident surface 10A on which light is incident on the side surface, and emits light incident from the light incident surface 10A from the light exit surface 10B.
  • the light source 11 has a light emitting surface that emits light.
  • the light source 11 is mounted on the FPC 12.
  • the light incident surface 10A of the light guide plate 10 and the light emitting surface of the light source 11 face each other.
  • the FPC 12 is a wiring board that supplies power to the light source 11.
  • the reflective sheet 13 is disposed in contact with the lower surface of the light guide plate 10, and reflects light so that the light in the light guide plate 10 does not leak from the lower surface of the surface light source device 1.
  • the housing 14 is composed of a bezel (metal frame) 21 and a resin frame 22.
  • the housing 14 is an example of a frame.
  • the bezel 21 has a bottom and side plate portions erected on the bottom.
  • the bottom of the bezel 21 is disposed on the side opposite to the light emitting surface 10 B of the light guide plate 10.
  • the side plate portion of the bezel 21 is disposed on the outer periphery of the bottom portion of the bezel 21 so as to face the light incident surface 10 A of the light guide plate 10.
  • the resin frame 22 is disposed at a corner formed by the bottom of the bezel 21 and the side plate.
  • the side plate portion of the bezel 21 may be disposed so as to surround the side surface of the light guide plate 10 at the outer periphery of the bottom portion of the bezel 21.
  • the FPC 12 is fixed to the light guide plate 10 by the double-sided adhesive tape 15 bonding the light guide plate 10 and the FPC 12.
  • the FPC 12 is fixed to the resin frame 22 by bonding the double-sided adhesive tape 16 to the FPC 12 and the resin frame 22.
  • the holding portion 17 has a bottom plate 31, a side wall 32 erected on the bottom plate 31, and a top plate 33 provided on the side wall 32 and facing the bottom plate 31.
  • the holding portion 17 has a spring property.
  • the light source 11 and the FPC 12 are disposed between the bottom plate 31 and the top plate 33.
  • the FPC 12 is disposed between the light source 11 and the top plate 33.
  • the light shielding double-sided tape 18 is fixed to the surface of the top plate 33 opposite to the surface facing the bottom plate 31.
  • the surface of the top plate 33 facing the bottom plate 31 is the inner surface of the top plate 33, and the surface of the top plate 33 opposite to the surface facing the bottom plate 31 is the outer surface of the top plate 33.
  • the light shielding double-sided tape 18 is an example of the light shielding tape.
  • a light shielding double-sided tape 18 is fixed to the top plate 33.
  • the top plate 33 is pulled in the normal direction of the light emitting surface 10 B of the light guide plate 10.
  • the top plate 33 is not fixed to the FPC 12. Therefore, even when the light shielding double-sided tape 18 is pulled to the normal direction side of the light emitting surface 10B of the light guide plate 10, the FPC 12 is not pulled. Therefore, even when the light shielding double-sided tape 18 is pulled in the normal direction of the light exit surface 10B of the light guide plate 10, no stress is applied to the double-sided adhesive tapes 15, 16. According to the surface light source device 1, peeling of the FPC 12 from the light guide plate 10 is suppressed, and peeling of the FPC 12 from the resin frame 22 is suppressed.
  • the "surface light source device” is described as a backlight unit of a liquid crystal display device.
  • the “surface light source device” may be used in applications other than a backlight unit, such as a front light disposed on the front of a display device or a display device made of electronic paper.
  • FIG. 2 is a perspective view illustrating an example of the liquid crystal display device according to the first embodiment.
  • the liquid crystal display device includes a surface light source device 1 disposed as a backlight, and a display panel (liquid crystal display) 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 the glass plates to increase or decrease the light transmittance.
  • the display panel 2 side may be described as the upper surface side, and the opposite surface side may be described as the lower surface side.
  • FIG. 3 is a cross-sectional view showing an example of the surface light source device 1 according to the first embodiment.
  • FIG. 3 shows a part of the surface light source device 1 according to the first embodiment.
  • the surface light source device 1 includes the light guide plate 10, the light source 11, the FPC 12, the reflective sheet 13, the housing 14, the double-sided adhesive tapes 15 and 16, the holding unit 17, the light-shielding double-sided tape 18, and the diffusion sheet 19. And one or two prism sheets 20.
  • the light guide plate 10 is substantially flat and is made of a translucent material such as polycarbonate resin and polymethyl methacrylate resin.
  • the light guide plate 10 has a light incident surface 10A on which light is incident on the side surface, and emits light incident from the light incident surface 10A from the light exit surface 10B.
  • the light guide plate 10 may include a light guide plate main body and a light introducing portion which is higher than the height of the light guide plate main body. The light emitted from the light source 11 efficiently enters the light guide plate main body from the light introducing portion, and the light use efficiency of the light guide plate 10 is improved.
  • the light guide plate main body is thinner than the light introducing portion, the reduction in thickness of the surface light source device 1 is improved, and the reduction in thickness of the liquid crystal display device including the surface light source device 1 is improved.
  • the light guide plate 10 may have a flat plate shape having no light introducing portion.
  • the light source 11 has a light emitting surface that emits light.
  • the light source 11 is mounted on the FPC 12.
  • the light incident surface 10A of the light guide plate 10 and the light emitting surface of the light source 11 face each other.
  • a plurality of light sources 11 may be mounted on the FPC 12 in a row at regular intervals.
  • 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 may be formed by sealing an LED chip, which is a light emitting element, with a translucent resin (resin layer) containing a phosphor.
  • the phosphor layer may be disposed on the light emitting surface 10B of the light guide plate 10 without disposing the phosphor on the LED chip, or the phosphor layer may be disposed on the reflective sheet 13.
  • the light source 11 receives power supply from the FPC 12 and is driven to light.
  • LED light sources other than white may be used as the light source 11.
  • the FPC 12 is a wiring board that supplies power to the light source 11.
  • the FPC 12 is formed by providing a wiring with a conductor foil on a flexible insulating film base material and adhering a cover lay or resin (photosensitive resin) as a protective insulating film on the surface. ing.
  • the reflective sheet 13 is disposed in contact with the lower surface of the light guide plate 10, and reflects light so that the light in the light guide plate 10 does not leak from the lower surface of the surface light source device 1.
  • the lower surface of the light guide plate 10 is the opposite surface of the light exit surface 10 B of the light guide plate 10.
  • the housing 14 accommodates the light guide plate 10, the light source 11, the FPC 12, the reflective sheet 13, the double-sided adhesive tapes 15 and 16, the diffusion sheet 19, and the prism sheet 20.
  • the housing 14 is composed of a bezel 21 and a resin frame 22.
  • the bezel 21 has a bottom and side plate portions erected on the bottom.
  • the bottom of the bezel 21 is disposed on the opposite side of the light exit surface 10 B of the light guide plate 10.
  • the side plate portion of the bezel 21 is disposed so as to surround the side surface of the light guide plate 10.
  • the resin frame 22 is disposed at a corner formed by the bottom of the bezel 21 and the side plate.
  • a base material of the resin frame 22 for example, a polycarbonate resin may be used.
  • the side plate portion of the bezel 21 and the resin frame 22 surround the light incident surface 10A of the light guide plate 10.
  • the side plate portion of the bezel 21 and the resin frame 22 may surround other side surfaces of the light guide plate 10 other than the light incident surface 10A.
  • the end of the side plate portion of the bezel 21 is bent by hemming.
  • the upper and lower surfaces of the double-sided adhesive tapes 15 and 16 are adhesive surfaces.
  • the double-sided adhesive tape 15 is disposed between the light guide plate 10 and the FPC 12, and the FPC 12 is fixed to the light guide plate 10 by bonding the light guide plate 10 to the FPC 12.
  • the double-sided pressure-sensitive adhesive tape 16 is disposed between the FPC 12 and the resin frame 22, and the FPC 12 is fixed to the resin frame 22 by bonding the FPC 12 and the resin frame 22 to each other.
  • the holding portion 17 has a flat plate-like bottom plate 31, a flat plate-like side wall 32 erected on the bottom plate 31, and a flat plate-like top plate 33 provided on the side wall 32 and facing the bottom plate 31.
  • the holding portion 17 has a spring property.
  • the holding portion 17 is substantially U-shaped in cross section.
  • the holding portion 17 is not limited to a substantially U shape in cross section, and may have another shape.
  • the material of the holding portion 17 is, for example, a metal such as stainless steel (SUS) or phosphor bronze, or a resin such as a liquid crystal polymer.
  • SUS stainless steel
  • phosphor bronze phosphor bronze
  • each thickness of the baseplate 31, the side wall 32, and the top plate 33 is 0.05 mm or more and 0.1 mm or less, for example, it is not limited to this range.
  • the light source 11 and the FPC 12 are disposed between the bottom plate 31 and the top plate 33.
  • the FPC 12 is disposed between the light source 11 and the top plate 33.
  • a top plate 33 covers the FPC 12.
  • the light shielding double-sided tape 18 is fixed to the surface of the top plate 33 opposite to the surface facing the bottom plate 31.
  • the surface of the top plate 33 facing the bottom plate 31 is the inner surface of the top plate 33, and the surface of the top plate 33 opposite to the surface facing the bottom plate 31 is the outer surface of the top plate 33.
  • a diffusion sheet 19 is provided on the light exit surface 10 B of the light guide plate 10.
  • One or two prism sheets 20 are provided on the diffusion sheet 19.
  • the diffusion sheet 19 is a translucent resin film, and diffuses the light emitted from the light exit surface 10B of the light guide plate 10 to widen the directivity characteristic of the light.
  • the prism sheet 20 is a transparent resin film on the upper surface of which a fine pattern in the form of a triangular prism is formed, and condenses the light diffused by the diffusion sheet 19 and the surface light source device 1 is viewed from the upper surface side. Increase the brightness.
  • the bottom of the bezel 21 has a protrusion 41 that protrudes in a direction away from the light guide plate 10.
  • 4A and 4B are schematic views of the protrusion 41.
  • FIG. FIG. 4A is a view of the protrusion 41 as viewed from the side.
  • FIG. 4B is a view of the protrusion 41 as viewed in the arrow direction of FIG. 4A.
  • the protrusion 41 has an inclined surface 42 which is inclined with respect to the bottom surface 23 of the bezel 21.
  • the protrusion 41 has a lower surface 43 having a level difference with the bottom surface 23 of the bezel 21.
  • the protrusion 41 has a side wall 44 provided upright on the bezel 21 and a flat plate 45 provided on the side wall 44.
  • the side wall 44 is orthogonal to the bottom of the bezel 21, and the flat plate 45 is parallel to the bottom of the bezel 21.
  • the bottom plate 31 has a through hole 34, and the protrusion 41 of the bezel 21 is fitted in the through hole 34 of the bottom plate 31.
  • the number of through holes 34 may be one or plural.
  • the number of the protrusions 41 may be one or more.
  • FIG. 5A to 5D are schematic views of the surface light source device 1 according to the first embodiment.
  • FIG. 5A is a view of a part of the surface light source device 1 as viewed from the top side, and shows a state in which the holding portion 17 is removed from the surface light source device 1.
  • FIG. 5B is a view of a part of the surface light source device 1 as viewed from the lower surface side, and shows a state in which the holding portion 17 is removed from the surface light source device 1.
  • FIG. 5C is a view of a part of the surface light source device 1 as viewed from the top side, showing a state in which the holding portion 17 is attached to the surface light source device 1.
  • FIG. 5A is a view of a part of the surface light source device 1 as viewed from the top side, and shows a state in which the holding portion 17 is removed from the surface light source device 1.
  • FIG. 5B is a view of a part of the surface light source device 1 as viewed from the lower surface side, and shows a state
  • 5D is a view of a part of the surface light source device 1 as viewed from the lower surface side, showing a state where the holding portion 17 is attached to the surface light source device 1.
  • the width of the top plate 33 of the holding portion 17 is larger than the width of the bottom plate 31 of the holding portion 17.
  • the width of the top plate 33 of the holding portion 17 may be the same as the width of the bottom plate 31 of the holding portion 17 without being limited to the examples shown in FIGS. 5C and 5D, or from the width of the bottom plate 31 of the holding portion 17 It may also be small.
  • FIG. 6 is a cross-sectional view showing an example of the surface light source device 1 according to the first embodiment.
  • FIG. 6 shows a part of the surface light source device 1 according to the first embodiment.
  • the surface light source device 1 shown in FIG. 6 includes a buffer member 51 between the FPC 12 and the top plate 33 of the holding unit 17.
  • the buffer member 51 is, for example, a base material having a cushioning property, such as a sponge member, a rubber member, or a resin member.
  • the buffer member 51 may be in the form of a tape.
  • the strength of the bottom plate 31 and the top plate 33 is improved by bending the tip 35 of the bottom plate 31 and the tip 36 of the top plate 33 by hemming.
  • the tip 35 of the bottom plate 31 is bent to the outer surface side of the bottom plate 31.
  • the surface of the bottom plate 31 facing the top plate 33 is the inner surface of the bottom plate 31, and the surface of the bottom plate 31 opposite the surface facing the top plate 33 is the outer surface of the bottom plate 31.
  • the tip 36 of the top 33 is bent to the inner side of the top 33.
  • the tip 36 of the top 33 may be bent to the outer surface side of the top 33.
  • the buffer member 51 may be fixed to the outer surface of the top plate 33 via an adhesive or a double-sided adhesive tape.
  • the tip end 36 of the top plate 33 is bent to the inner surface side of the top plate 33, a space is formed between the FPC 12 and the top plate 33.
  • a buffer member 51 is disposed in a space formed between the FPC 12 and the top plate 33.
  • FIG. 7 is a cross-sectional view showing an example of the surface light source device 1 according to the first embodiment.
  • FIG. 7 shows a part of the surface light source device 1 according to the first embodiment.
  • an L bending portion 37 is provided around the through hole 34 of the bottom plate 31 and on the tip 35 side of the bottom plate 31.
  • an L bending portion 46 is provided at the bottom of the bezel 21 so as to be adjacent to the projecting portion 41 of the bezel 21.
  • the L bent portion 46 of the bezel 21 is inserted into the through hole 34 of the bottom plate 31, and a portion of the L bent portion 46 of the bezel 21 protrudes from the through hole 34 of the bottom plate 31.
  • the protrusion 41 and the L-bent portion 46 of the bezel 21 are inserted into the through-hole 34 of the bottom plate 31, a portion of the protrusion 41 and a portion of the L-bent portion 46 of the bezel 21 protrude from the through-hole 34 of the bottom plate 31.
  • the projection 41 of the bezel 21 is fitted in the through hole 34 of the bottom plate 31.
  • the L-bent portion 37 of the bottom plate 31 abuts on the L-bent portion 46 of the bezel 21 to restrict movement of the bottom plate 31 in the horizontal direction. As a result, the positional deviation of the holding portion 17 is suppressed, and the holding portion 17 is prevented from coming off the surface light source device 1. Since the L-bending portion 37 of the bottom plate 31 and the L-bending portion 46 of the bezel 21 are in surface contact, the fitting between the protrusion 41 of the bezel 21 and the through hole 34 of the bottom plate 31 becomes strong. Further, the L-bent portion 46 of the bezel 21 closes the hole surrounded by the side wall 44 of the projecting portion 41 and the flat plate 45.
  • the L bending portion 46 at the bottom of the bezel 21 may be omitted without being limited to the example of FIG. 7.
  • the fitting between the projecting portion 41 of the bezel 21 and the through hole 34 of the bottom plate 31 becomes strong.
  • the L bending portion 37 of the bottom plate 31 may be omitted without being limited to the example of FIG. 7.
  • the outer peripheral portion of the through hole 34 of the bottom plate 31 and the L bending portion 46 of the bezel 21 are in line contact, the fitting between the protrusion 41 of the bezel 21 and the through hole 34 of the bottom plate 31 becomes strong.
  • a resin frame may be erected on the outer periphery of the bottom of the bezel 21, and the resin frame may abut on both ends in the width direction of the top plate 33.
  • a metal frame may be erected on the outer periphery of the bottom of the bezel 21, and the metal frame may abut on both ends of the top plate 33 in the width direction. Movement of the top plate 33 in the width direction is restricted by that both ends in the width direction of the top plate 33 abut on the resin frame or the metal frame. As a result, the positional deviation of the holding portion 17 is suppressed, and the holding portion 17 is prevented from coming off the surface light source device 1.
  • FIG. 8A is a perspective view of the holder 17 according to the first embodiment.
  • the bottom plate 31 of the holding portion 17 has a plurality of through holes 34.
  • the bottom plate 31 may have a positioning hole 38.
  • the bezel 21 may have a positioning protrusion.
  • the holding portion 17 may be positioned with respect to the bezel 21 by using the positioning protrusion of the bezel 21 and the positioning hole 38 of the bottom plate 31.
  • the width W1 of the bottom plate 31 is, for example, 50 mm or more and 60 mm or less, but is not limited to this range.
  • the width W2 of the top 33 is, for example, 70 mm or more and 80 mm or less, but is not limited to this range.
  • FIG. 8B and 8C are cross-sectional views of the holder 17 according to the first embodiment.
  • the tip 35 of the bottom plate 31 of the holding portion 17 and the tip 36 of the top plate 33 are bent by hemming.
  • the tip 35 of the bottom plate 31 of the holding portion 17 and the tip 36 of the top plate 33 are bent by hemming and are around the through hole 34 of the bottom plate 31 of the holding portion 17.
  • An L bending portion 37 is provided on the tip 35 side.
  • the length L1 of the bottom plate 31 is, for example, 4 mm or more and 5 mm or less, but is not limited to this range.
  • the length L2 of the top 33 is, for example, 2 mm or more and 3 mm or less, but is not limited to this range.
  • the length L3 of the bent portion of the tip 35 of the bottom plate 31 is, for example, 0.5 mm or less, but is not limited to this value.
  • the length L4 of the bent portion of the tip 36 of the top 33 is, for example, 0.5 mm or less, but is not limited to this value.
  • height T1 of side wall 32 shown in Drawing 8B and Drawing 8C is 0.8 mm or more and 1 mm or less, for example, it is not limited to this range.
  • the internal angle between the bottom plate 31 and the side wall 32 is, for example, 90 °, but is not limited to this value.
  • the internal angle between the side wall 32 and the top 33 is less than 90 °, for example, 85 °, but is not limited to this value.
  • FIGS. 9A to 9C A method of attaching the holder 17 to the surface light source device 1 will be described with reference to FIGS. 9A to 9C.
  • FIG. 9A by pulling up the top 33 in the vertical direction of the top 33, the internal angle between the side wall 32 and the top 33 is increased, and the opening of the holding portion 17 is expanded.
  • FIG. 9B in a state where the top plate 33 is pulled up, the surface light source device 1 is disposed to face the opening of the holding portion 17, and then the surface light source device 1 includes the bottom plate 31 and the top plate 33.
  • the surface light source device 1 is slid in a parallel direction so as to be inserted between the two.
  • the internal angle between the side wall 32 and the top plate 33 is reduced by the restoring force of the holding portion 17, and the opening of the holding portion 17 is narrowed.
  • the surface light source device 1 enters between the bottom plate 31 and the top plate 33, and the projection 41 of the bezel 21 is fitted in the through hole 34 of the bottom plate 31.
  • FIG. 10 is a cross-sectional view of the liquid crystal display device according to the first embodiment.
  • the liquid crystal display device includes a surface light source device 1 and a display panel 2.
  • the display panel 2 has an upper glass 71 and a lower glass 72.
  • the display panel 2 also has lower and upper polarizing plates (not shown).
  • the display panel 2 is fixed to the light shielding double-sided tape 18.
  • the surface light source device 1 and the display panel 2 are connected by the main FPC 73.
  • the main FPC 73 is fixed to the surface light source device 1 and the display panel 2 by a double-sided adhesive tape.
  • a driver IC (Integrated Circuit) 74 is provided on the main FPC 73.
  • the driver IC 74 controls the display panel 2.
  • the main FPC 73 is bent 180 degrees and attached to the protrusion 41 of the bezel 21.
  • the driver IC 74 is disposed between the bezel 21 and the main FPC 73 in the planar direction of the holding portion 17.
  • the driver IC 74 may be provided in the display panel 2 without being limited to the example of FIG.
  • the display panel 2 Since the resilience of the main FPC 73 is large, the display panel 2 is pulled in the normal direction of the light exit surface 10 B of the light guide plate 10. Therefore, the light shielding double-sided tape 18 is pulled toward the display panel 2 side.
  • the light shielding double-sided tape 18 is attached to the top plate 33, and the top plate 33 is fixed to the light shielding double-sided tape 18.
  • the top plate 33 When the light shielding double-sided tape 18 is pulled to the display panel 2 side, the top plate 33 is pulled to the display panel 2 side.
  • the top plate 33 is in contact with the FPC 12, the top plate 33 is not fixed to the FPC 12. Therefore, even when the light shielding double-sided tape 18 is pulled toward the display panel 2, no stress is applied to the double-sided adhesive tapes 15 and 16.
  • the surface light source device 1 of the first embodiment peeling of the FPC 12 from the light guide plate 10 is suppressed, and peeling of the FPC 12 from the resin frame 22 is suppressed. Since the top plate 33 covers the FPC 12, when external force is applied to the surface light source device 1, stress applied to the light source 11 and the FPC 12 is reduced. By reducing the stress applied to the light source 11, the positional deviation of the light source 11 is suppressed, and the decrease in the luminance of the light emitted from the light guide plate 10 and the variation in the luminance distribution of the light are suppressed.
  • FIG. 11 is a cross-sectional view showing an example of the surface light source device 1 according to the second embodiment.
  • FIG. 11 shows a part of the surface light source device 1 according to the second embodiment.
  • the surface light source device 1 includes the light guide plate 10, the light source 11, the FPC 12, the reflective sheet 13, the housing 14, the double-sided adhesive tapes 15 and 16, the holding unit 17, the light-shielding double-sided tape 18, and the diffusion sheet 19. And one or two prism sheets 20 and a spacer 52.
  • the bottom of the bezel 21 has a protrusion 47 that protrudes in a direction away from the light guide plate 10.
  • the bottom plate 31 has a through hole 34, and the protrusion 47 of the bezel 21 is fitted in the through hole 34 of the bottom plate 31.
  • the number of through holes 34 may be one or plural.
  • the number of the protrusions 47 may be one or more.
  • the projecting portion 47 of the bezel 21 When the projecting portion 47 of the bezel 21 is accommodated in the through hole 34 of the bottom plate 31, there may be no level difference between the bottom plate 31 and the projecting portion 47 of the bezel 21. That is, the outer surface of the bottom plate 31 and the top surface of the projection 47 of the bezel 21 may be located on the same plane. Since there is no step between the bottom plate 31 and the projecting portion 47 of the bezel 21, the stress generated in the surface light source device 1 is dispersed when external force is applied to the surface light source device 1, and the double-sided adhesive tape The stress applied to 15, 16 is reduced.
  • the outer surface of the bottom plate 31 is the opposite surface of the bottom plate 31 to the surface facing the top plate 33.
  • the projecting portion 47 of the bezel 21 is accommodated in the through hole 34 of the bottom plate 31, the projecting portion 47 of the bezel 21 is recessed relative to the bottom plate 31 so that the space between the bottom plate 31 and the projecting portion 47 of the bezel 21 is There may be a step.
  • the bottom of the bezel 21 has a protrusion 48 that protrudes in a direction away from the light guide plate 10.
  • the protrusion 48 is disposed closer to the center of the bezel 21 than the protrusion 47.
  • the protrusion 48 is disposed normal to the lower surface of the light guide plate 10 and below the light guide plate 10. There may be no step between the bottom plate 31 and the projecting portion 48 of the bezel 21. That is, the outer surface of the bottom plate 31 and the top surface of the projection 48 of the bezel 21 may be located on the same plane.
  • the stress generated in the surface light source device 1 is dispersed when external force is applied to the surface light source device 1, and the double-sided adhesive tape The stress applied to 15, 16 is reduced.
  • a space is formed inside the projection 48, and a spacer 52 is provided in the space inside the projection 48. Therefore, the spacer 52 is disposed between the light guide plate 10 and the protrusion 48.
  • the spacer 52 is a base such as PET (polyethylene terephthalate) or a heat conducting member such as a graphite sheet.
  • the spacer 52 is a heat conducting member, the heat generated by the light source 11 can be diffused in the horizontal direction of the surface light source device 1, and the heat dissipation of the surface light source device 1 is improved.
  • a resin frame may be erected on the outer periphery of the bottom of the bezel 21, and the resin frame may abut on both ends of the top plate 33 in the width direction.
  • a metal frame may be erected on the outer periphery of the bottom of the bezel 21, and the metal frame may abut on both ends of the top plate 33 in the width direction. Movement of the top plate 33 in the width direction is restricted by that both ends in the width direction of the top plate 33 abut on the resin frame or the metal frame. As a result, the positional deviation of the holding portion 17 is suppressed, and the holding portion 17 is prevented from coming off the surface light source device 1.
  • the peeling of the FPC 12 from the light guide plate 10 and the peeling of the FPC 12 from the resin frame 22 are suppressed. Since the top plate 33 covers the FPC 12, when external force is applied to the surface light source device 1, stress applied to the light source 11 and the FPC 12 is reduced.
  • Such a display device can be mounted on various electronic devices.
  • a smartphone, a digital camera, a tablet terminal, an electronic book, a wearable device, a car navigation device, an electronic dictionary, an electronic advertisement board, and the like can be exemplified as the electronic device provided with such a display device.
  • Such electronic devices can be miniaturized and thinned, and can be expected to provide a display of excellent quality.
  • Reference Signs List 1 surface light source device 2 display panel 10 light guide plate 11 light source 12 FPC 13 Reflective sheet 14 Housing 15, 16 Double-sided adhesive tape 17 Holding part 18 Light-shielded double-sided tape 19 Diffusion sheet 20 Prism sheet 21 Bezel 22 Resin frame

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)

Abstract

La présente invention inhibe la séparation d'une carte imprimée d'avec une plaque de guidage de la lumière et un châssis. Ce dispositif source de lumière de surface comprend : une partie de support qui comporte une plaque inférieure, des parois latérales dressées sur la plaque inférieure et une plaque supérieure disposée sur les parois latérales et à l'opposé de la plaque inférieure ; une source de lumière qui comporte une surface d'émission de lumière pour émettre de la lumière et qui est disposée entre la plaque inférieure et la plaque supérieure ; une plaque de guidage de la lumière qui est située à l'opposé de la surface d'émission de lumière, qui comporte une surface d'incidence de la lumière sur laquelle une lumière est rendue incidente, sur une surface latérale, et qui émet la lumière incidente sur la surface d'incidence de la lumière, à partir d'une surface d'émission ; un châssis qui abrite la source de lumière et la plaque de guidage de la lumière ; une carte imprimée qui est disposée entre la plaque supérieure et la source de lumière, et qui est fixée à la plaque de guidage de la lumière et au châssis ; et une bande de protection contre la lumière qui est fixée à une surface opposée à la surface de la plaque supérieure faisant face à la plaque inférieure.
PCT/JP2018/047594 2018-01-17 2018-12-25 Dispositif source de lumière de surface, dispositif d'affichage et dispositif électronique WO2019142620A1 (fr)

Applications Claiming Priority (2)

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JP2018005742A JP6850948B2 (ja) 2018-01-17 2018-01-17 面光源装置、表示装置、及び電子機器
JP2018-005742 2018-01-17

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WO2019142620A1 true WO2019142620A1 (fr) 2019-07-25

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WO2022183693A1 (fr) * 2021-03-01 2022-09-09 惠州华星光电显示有限公司 Appareil d'affichage

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CN110491284B (zh) * 2019-09-10 2022-09-16 高创(苏州)电子有限公司 背光框、背光模组及显示模组
JP2021071526A (ja) * 2019-10-29 2021-05-06 凸版印刷株式会社 液晶表示装置
CN115225804B (zh) * 2021-09-23 2024-01-16 新思考电机有限公司 图像传感器驱动装置、照相机装置及电子设备

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JP2017091635A (ja) * 2015-11-04 2017-05-25 株式会社ｎｉｔｔｏｈ 照明装置

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TWM489302U (en) * 2014-07-17 2014-11-01 Innolux Corp Display device
JP2018014315A (ja) * 2016-07-08 2018-01-25 株式会社ジャパンディスプレイ バックライト装置およびこれを備える液晶表示装置

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WO2012063917A1 (fr) * 2010-11-12 2012-05-18 シャープ株式会社 Dispositif d'éclairage et dispositif d'affichage à cristaux liquides le comprenant
JP2017091635A (ja) * 2015-11-04 2017-05-25 株式会社ｎｉｔｔｏｈ 照明装置

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WO2022183693A1 (fr) * 2021-03-01 2022-09-09 惠州华星光电显示有限公司 Appareil d'affichage

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JP2019125504A (ja) 2019-07-25
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TW201932941A (zh) 2019-08-16

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