WO2022009525A1 - Dispositif d'éclairage plan - Google Patents

Dispositif d'éclairage plan Download PDF

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Publication number
WO2022009525A1
WO2022009525A1 PCT/JP2021/018548 JP2021018548W WO2022009525A1 WO 2022009525 A1 WO2022009525 A1 WO 2022009525A1 JP 2021018548 W JP2021018548 W JP 2021018548W WO 2022009525 A1 WO2022009525 A1 WO 2022009525A1
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WO
WIPO (PCT)
Prior art keywords
guide plate
light guide
light
lighting device
planar lighting
Prior art date
Application number
PCT/JP2021/018548
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English (en)
Japanese (ja)
Inventor
和正 安達
良太 倉田
Original Assignee
ミネベアミツミ株式会社
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
Application filed by ミネベアミツミ株式会社 filed Critical ミネベアミツミ株式会社
Priority to CN202180032911.0A priority Critical patent/CN115552324A/zh
Priority to JP2021553362A priority patent/JP7340028B2/ja
Publication of WO2022009525A1 publication Critical patent/WO2022009525A1/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
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to a planar lighting device.
  • a planar lighting device used as a backlight of a liquid crystal display device is known (see Patent Documents 1, 2, etc.).
  • a top frame (housing frame) provided with an opening for light emission is often used as a part of the housing, and the portion of the top frame forming the opening for light emission is It is called a picture frame.
  • a picture frame the portion of the top frame forming the opening for light emission is It is called a picture frame.
  • edge light type planar lighting device in which light is incident from the incoming light side surface of the light guide plate and is emitted from one main surface of the light guide plate, and the exit surface has a horizontally long shape and is guided.
  • the exit surface has a horizontally long shape and is guided.
  • elastic members such as rubber, which are arranged on the terminal side (opposite to the light entrance side) of the light guide plate and on the left and right sides and press the light guide plate to the light entrance side, are eliminated, and the light entrance side of the light guide plate has high adhesive strength.
  • the frame is narrowed on three sides.
  • the size of the liquid crystal display device increases, the size of the planar lighting device increases, and when the long side on the incoming light side becomes, for example, about 700 to 800 mm, it is fixed by a thermocompression bonding tape or the like at a place where the amount of elongation of the light guide plate is large.
  • the light guide plate could not be sufficiently fixed due to the structural failure (aggregation failure) of the portion.
  • the longest possible range on the side of the incoming light should be fixed, but it was difficult to predict the expansion and contraction of the light guide plate, and it was difficult to maximize the fixed range. ..
  • the structurally broken portion affects the optical characteristics of the light guide plate, it should be fixed within a range where the structural failure does not occur. Further, since the amount of expansion and contraction of the horizontally long light guide plate to the left and right is not determined, it is difficult to design the frame on the left and right sides.
  • the present invention has been made in view of the above, and it is possible to stably fix the light guide plate and facilitate the frame design, and it is possible to narrow the frame even for a large light guide plate. It is an object of the present invention to provide a shape lighting device.
  • the planar lighting device includes a bottom frame, a recess, a center pin, and a fixing portion.
  • the bottom frame has a floor portion and a side wall erected on the peripheral edge of the floor portion, and accommodates a light guide plate.
  • the recess is provided substantially in the center of the side of the light guide plate on the light receiving side.
  • the center pin is erected on the floor and fits into the recess.
  • the fixing portion fixes the light guide plate to the bottom frame within a predetermined distance from the center pin on the side of the light guide plate on the light entrance side.
  • the planar lighting device can stably fix the light guide plate and facilitate the frame design, and can narrow the frame even for a large light guide plate.
  • FIG. 1 is a plan view of a planar lighting device according to an embodiment.
  • FIG. 2 is a perspective view of a flat type planar lighting device.
  • FIG. 3 is an exploded perspective view of a main part of a flat type planar lighting device.
  • FIG. 4 is a perspective view of a curved type planar lighting device.
  • FIG. 5 is an exploded perspective view of a main part of a curved type planar lighting device.
  • FIG. 6 is a plan view near the center of the long side of the incoming light side of the planar lighting device.
  • FIG. 7 is a plan view of the planar lighting device in a state where the top frame, the optical sheet, and the like near the center of the long side on the incoming light side are removed.
  • FIG. 1 is a plan view of a planar lighting device according to an embodiment.
  • FIG. 2 is a perspective view of a flat type planar lighting device.
  • FIG. 3 is an exploded perspective view of a main part of a flat
  • FIG. 8 is a plan view in a state where the top frame, the optical sheet, the light guide plate, the reflection sheet, and the like near the center of the long side on the incoming light side of the planar lighting device are removed.
  • FIG. 9 is a cross-sectional view of X1-X1 in FIG. 6 of the planar lighting device.
  • FIG. 10 is a diagram showing an example of the relationship between the elongation amount of the thermocompression bonding tape and the stress in an environment of 85 ° C.
  • FIG. 11 is a diagram showing an example of a model for verifying a range in which cohesive failure of the thermocompression bonding tape does not occur.
  • FIG. 12 is a diagram showing an example of the length of the fixing portion by the thermocompression bonding tape when the planar lighting device is diagonally 32 inches.
  • FIG. 13 is a diagram showing an example of the length of the fixing portion by the thermocompression bonding tape when the planar lighting device has a diagonal of 12.3 inches.
  • FIG. 14 is a plan view showing an example of an optical sheet.
  • FIG. 15 is an enlarged view of the portion A1 shown by the broken line in FIG.
  • FIG. 16 is a cross-sectional view of X2-X2 in FIG. 6 of the planar lighting device.
  • FIG. 1 is a plan view of the planar lighting device 1 according to the embodiment.
  • the plan view of FIG. 1 is also used as the plan view of the curved type planar lighting device 1 described later.
  • FIG. 2 is a perspective view of the flat type planar lighting device 1.
  • FIG. 3 is an exploded perspective view of a main part of the flat type planar lighting device 1. Further, for convenience, the long side direction of the planar lighting device 1 is the X-axis direction, the short side direction is the Y-axis direction, and the thickness direction is the Z-axis direction.
  • the planar lighting device 1 has a shape in which a reflective sheet 4, a light guide plate 7, and an optical sheet 9 are sequentially laminated on a bottom frame 3 and covered with a top frame 10. .
  • the bottom frame 3 and the top frame 10 have a flat main surface.
  • a plurality of light sources that emit light to the light entrance side surface (the side surface of the long side on the front side in the figure) of the light guide plate 7 and a substrate on which these light sources are mounted are omitted.
  • the connecting portion 2 is a member having one end connected to an internal substrate and used for electrical connection with the outside.
  • the bottom frame 3 is made of metal, for example, and is formed of die casting, sheet metal, or the like.
  • the reflective sheet 4 is for reflecting the light leaked from the light guide plate 7 to the bottom frame 3 side and returning it to the light guide plate 7 side. If the floor surface of the bottom frame 3 is painted white and has good reflection characteristics, the reflection sheet 4 may be omitted.
  • the light guide plate 7 is made of a transparent resin such as polycarbonate or acrylic, and guides the light incident from the incoming light side surface on the long side to the entire surface and emits light from one main surface (upper main surface in the figure). do.
  • the optical sheet 9 is one or a plurality of sheets that exert an optical action, such as a diffusion sheet, a prism sheet, a brightness increasing film (DBEF: Dual Brightness Enhancement Film), and the like.
  • One end of the long side of the optical sheet 9 (the front side in the figure) is fixed to, for example, one piece of the sheet fixing frame 8 in which an elongated plate is bent into a substantially L-shaped cross section, and the sheet fixing frame 8 is fixed.
  • the other piece is sandwiched and fixed between the side wall of the bottom frame 3 and the side wall of the top frame 10.
  • the optical sheet 9 may be fixed by passing the center pin 11 through the hole provided in the optical sheet 9.
  • the top frame 10 is made of, for example, a resin or the like.
  • FIG. 4 is a perspective view of the curved type planar lighting device 1
  • FIG. 5 is an exploded perspective view of the main part of the curved type planar lighting device 1.
  • the plan view is the same as that in FIG. 4 and 5, the bottom frame 3, the reflective sheet 4, the light guide plate 7, the optical sheets 9A to 9C (corresponding to the optical sheet 9), and the top frame 10 are shown except that the main surface is curved. 2 and FIG. 3 are similar.
  • the bottom frame 3 and the top frame 10 are formed in a curved state from the beginning, the reflective sheet 4, the light guide plate 7, and the optical sheets 9A to 9C are not curved before assembly, and are on the bottom frame 3. It is curved when placed and fixed in a state of being pressed by the top frame 10.
  • FIG. 6 is a plan view of the planar lighting device 1 near the center of the long side on the incoming light side.
  • a center pin 11 is erected in the Z-axis direction near the center of the long side on the incoming light side of the planar lighting device 1, and the center pin 11 is erected from the hole portion 10h of the frame portion 10a of the top frame 10. You can see the tip of.
  • the hole 10h may not be provided.
  • the convex portion 3c provided on the side wall of the bottom frame 3 is fitted into the hole portion 10c provided in the frame portion 10a of the top frame 10, and the side wall of the top frame 10 is on the outside (in the figure). It is prevented from bending in a bow shape (lower side, in the Y-axis direction).
  • FIG. 7 is a plan view in a state where the top frame 10 and the optical sheets 9 (9A to 9C) near the center of the long side on the incoming light side of the planar lighting device 1 are removed.
  • an arcuate notch 7b (corresponding to the “recess” of the present invention) is provided near the center of the long side of the light guide plate 7 on the light entrance side, and this notch 7b is the center pin 11. It is designed to come into contact with the outer peripheral surface of the.
  • the center pin 11 positions the central portion of the light guide plate 7, and it is desirable that the center pin 11 and the notch portion 7b are loosely fitted so as not to give unnecessary stress to the light guide plate 7 and deteriorate the optical characteristics. ..
  • the emission surface of the light source 6 such as a plurality of LEDs (Light Emitting Diodes) provided on the substrate 5 is arranged so as to face the light entrance side surface 7a of the light guide plate 7.
  • the side wall 3b of the bottom frame 3 is provided with a claw-shaped convex portion 3d protruding outward (lower side in the figure), and by fitting with a hole provided in the side wall of the top frame 10, the side wall 3b is fitted with a hole portion.
  • the bottom frame 3 and the top frame 10 are fixed in the Z-axis direction.
  • FIG. 8 is a plan view in a state where the top frame 10, the optical sheets 9 (9A to 9C), the light guide plate 7, the reflective sheet 4, and the like near the center of the long side on the incoming light side of the planar lighting device 1 are removed. ..
  • a strip-shaped white double-sided tape 13 is attached to the outer peripheral portion of the inner surface of the floor portion 3a of the bottom frame 3 on the light receiving side so as to extend in the X-axis direction while avoiding the center pin 11.
  • a base film 14 made of a band-shaped transparent polycarbonate or the like is attached to the outer peripheral portion of the double-sided tape 13 on the light receiving side.
  • thermocompression bonding tapes 16 arranged between the light sources 6 so as not to affect the incident light on the light guide plate 7 are provided in a flying island shape. ing. Further, on the left and right and above, which are a part of the peripheral edge of each thermocompression bonding tape 16, spacers 15 made of white resin divided in the longitudinal direction so as to surround them at a predetermined distance are formed by double-sided tape or the like. It is pasted.
  • thermocompression bonding tape 16 is melted by heating and adheres between the base film 14 and the light guide plate 7 with high strength. Since the base film 14 is strongly fixed to the floor portion 3a of the bottom frame 3 by the double-sided tape 13 having a large area, the light guide plate 7 is strongly fixed to the bottom frame 3.
  • the spacer 15 functions as a flow stop when the thermocompression bonding tape 16 melts, and secures an adhesive force by securing a predetermined adhesive area and thickness. The reason why the spacer 15 is divided in the longitudinal direction is to absorb the difference in linear expansion coefficient from the base film 14 or the like to be attached.
  • a fixing member of an adhesive type that can be applied with a syringe or the like and that does not require a heat source and is cured by moisture in the atmosphere can also be used.
  • FIG. 9 is a cross-sectional view of X1-X1 in FIG. 6 of the planar lighting device 1.
  • the center pin 11 is screwed and fixed to the floor portion 3a of the bottom frame 3 from the outside (lower side in the figure) via the nut 12, and the head portion 11b of the center pin 11 is fixed to the bottom frame 3. It's on the outside.
  • the center pin 11 may be fixed to the bottom frame 3 by press fitting instead of screwing.
  • the shaft portion 11a of the center pin 11 penetrates the reflective sheet 4, the light guide plate 7, and the optical sheets 9 (9A to 9C) and extends to the inside of the hole portion 10h of the frame portion 10a of the top frame 10. As described above, the shaft portion 11a of the center pin 11 is in contact with the notch portion 7b at the center of the long side of the light guide plate 7 on the incoming light side.
  • a substrate 5 in which a plurality of light sources 6 are arranged in the long side direction is fixed by double-sided tape or the like, and the emission surface of the light source 6 is on the entrance side surface 7a of the light guide plate 7. Facing each other.
  • the light source 6 a top-view type LED or the like that emits light on the top surface side is shown as an example, but a side-view type LED or the like that emits light on the side surface side can also be used.
  • the substrate 5 is arranged parallel to the floor portion 3a of the bottom frame 3.
  • FIG. 10 is a diagram showing an example of the relationship between the elongation amount of the thermocompression bonding tape 16 and the stress in an environment of 85 ° C.
  • the amount of elongation is a reversible change up to 0.7 mm
  • the stress increases with the amount of elongation
  • the stress decreases as the amount of elongation decreases.
  • the amount of elongation exceeds 0.7 mm
  • an irreversible change occurs, the stress decreases with the amount of elongation, and even if the amount of elongation is reduced, it cannot be restored.
  • there is only one inflection point, and the elongation limit and the fracture are the same point.
  • FIG. 11 is a diagram showing an example of a model for verifying a range in which cohesive failure of the thermocompression bonding tape 16 does not occur.
  • GLASS D263 is the base part, and on top of that, "BST” corresponding to double-sided tape 13, "Base Film PC” corresponding to base film 14, and Tobishima-shaped "” corresponding to thermocompression bonding tape 16.
  • "HBT” and "LGP” corresponding to the light guide plate 7 are arranged.
  • the inside of the wall on the left side of “GLASS D263” is the reference position for expansion and contraction, and linear expansion occurs to the right.
  • the reason why glass is used instead of metal for the base corresponding to the bottom frame is that the difference in the amount of thermal expansion from the light guide plate is ⁇ X due to the use of a member having a smaller coefficient of thermal expansion than metal. This is to realize.
  • the central portion of the long side of the light guide plate 7 on the incoming light side is positioned by the center pin 11, and the central portion serves as a reference position for linear expansion.
  • the fixing range can be maximized.
  • the amount of expansion and contraction on the left and right is the same, it is easy to design the frame on the left and right sides.
  • FIG. 12 is a diagram showing an example of the length of the fixed portion by the thermocompression bonding tape when the planar lighting device 1 is diagonally 32 inches, and has a flying island shape in a range of 400 mm centered on the central portion of the long side. It is within the range of fixing with the thermocompression bonding tape 16.
  • FIG. 13 is a diagram showing an example of the length of the fixed portion by the thermocompression bonding tape when the planar lighting device 1 has a diagonal of 12.3 inches, and has a flying island shape of 300 mm, which is the entire range of the long side. The range of fixing with the thermocompression bonding tape 16 is set.
  • the strength as a device will be considered.
  • a light guide plate is fixed with ordinary double-sided tape, and a light guide plate with a weight of 18.6 g is used for comparison.
  • the shear strength is 4 N / mm 2
  • the adhesive area per 1 g is 4 mm 2 / g
  • the adhesive strength of the backlight is 298 N
  • [adhesive area per 1 g] ⁇ [adhesive strength of the backlight] ⁇ . 10 2 is 12.
  • the light guide plate weight 272 g, shear strength is 25 N / mm 2, the adhesion area adhesive area per 143.9mm 2, 1g 0. 5 mm 2 / g, the adhesive strength of the backlight is 3598 N, and [adhesive area per 1 g] ⁇ [adhesive strength of the backlight] ⁇ 10 2 is 19.
  • the light guide plate weight 93 g, shear strength is 25 N / mm 2, the adhesive area bonded area 107.93Mm 2, per 1 g 1.
  • the adhesive strength of the backlight is 2698 N
  • [adhesive strength of the backlight] ⁇ 10 2 is 31.
  • the surface illumination device 1 of FIG. 12 or 13 is higher strength than the standard model.
  • the drop impact resistance, the thermal impact resistance, and the brightness drop rate are all good including the standard model.
  • FIG. 14 is a plan view showing an example of the optical sheet 9 (9A, 9B, 9C).
  • FIG. 15 is an enlarged view of the portion A1 shown by the broken line in FIG.
  • the center of the optical sheet 9 (9A, 9B, 9C) is located at a predetermined distance from the end in the lateral direction at the substantially center of the side on the incoming light side (lower side in the figure).
  • a hole 9a into which the pin 11 (FIGS. 6 to 9) is fitted is provided.
  • the outer diameter of the center pin 11 and the hole diameter of the hole portion 9a of the optical sheet 9 are designed so that there is no play, but the optical sheet 9 is slightly deformed even if it is designed with tight tolerances. No problem.
  • notches 9c extending in the longitudinal direction are provided at both ends of the portion of the optical sheet 9 (9A, 9B, 9C) where the hole portion 9a is provided, and the portion where the hole portion 9a is provided is the selvage portion 9b. ..
  • the cutout portion 9c is for avoiding interference with the rib 10i of the top frame 10 described later.
  • the optical sheet 9 (9A, 9B, 9C) rotates around the center pin 11 (hole portion 9a) at both ends of the side of the optical sheet 9 (9A, 9B, 9C) on the incoming light side.
  • a claw portion 9d is provided to prevent the generation of rattle noise.
  • the claw portion 9d abuts on the side wall 3b of the bottom frame 3 or the substrate 5.
  • the optical sheet was mainly fixed to the light guide plate with double-sided tape on the left and right sides of a horizontally long rectangle.
  • the weight of the optical sheet also increases, and it has become difficult to stably hold the optical sheet by fixing it with double-sided tape.
  • fixing on the left and right sides has been abolished, and fixing on the incoming side has been started.
  • the light guide plate is the only place where the optical sheet can be fixed on the light entrance side, and if the optical sheet is fixed directly to the light guide plate, there is a problem that the brightness is lowered and the reliability is lowered due to the generation of wrinkles.
  • the optical sheet 9 in fixing the optical sheet 9 by the center pins 11 (FIGS. 6 to 9) of FIGS. 14 and 15, the optical sheet 9 has a simple structure in which the holes 9a of the optical sheet 9 are simply inserted into the center pins 11. Can be stably supported. Further, since the optical sheet 9 is not directly fixed to the light guide plate 7, it does not affect the optical characteristics and reliability. Furthermore, since it is fixed without using double-sided tape, it is easy to obtain position accuracy and clearance can be reduced, which can further contribute to narrowing the frame. Further, since the optical sheet 9 is supported at one place by the center pin 11, wrinkles do not occur as in the case of fixing with double-sided tape.
  • FIG. 16 is a cross-sectional view of X2-X2 in FIG. 6 of the planar lighting device 1.
  • a rib 10i projecting toward the light guide plate 7 and extending in the longitudinal direction is provided.
  • the ribs 10i are arranged on both sides of the selvage portion 9b of the optical sheet 9 so as not to come into contact with the optical sheet 9.
  • the rib 10i presses the main surface of the light guide plate 7 on the incoming light side toward the floor portion 3a of the bottom frame 3 via the cushion material 17.
  • the surface of the cushion material 17 facing the light guide plate 7 is subjected to a reflection treatment such as white.
  • a reflection treatment such as white.
  • the fixing of the light guide plate 7 to the bottom frame 3 by the double-sided tape 13, the base film 14, and the thermocompression bonding tape 16 described above can be strengthened, and the light guide plate 7 can be prevented from rising or shifting.
  • the reflection treatment of the cushion material 17 by white or the like can reduce the leakage of light to the cushion material 17 side and suppress the influence on the optical characteristics of the light guide plate 7.
  • the planar lighting device has a floor portion and a side wall erected on the peripheral edge of the floor portion, and has a bottom frame for accommodating the light guide plate and a light receiving side of the light guide plate.
  • the light guide plate is bottomed within a predetermined distance from the concave portion provided in the substantially center of the side, the center pin erected on the floor and fitted with the concave portion, and the center pin on the side of the light receiving side of the light guide plate. It has a fixing part to be fixed to the frame. As a result, the light guide plate can be stably fixed and the frame design can be facilitated, and the frame can be narrowed even for a large light guide plate.
  • the predetermined distance is a distance at which the fixed portion does not collapse due to expansion and contraction within the operating temperature range of the light guide plate. As a result, it is possible to prevent an adverse effect on the optical characteristics of the light guide plate due to the structural failure of the fixed portion.
  • the fixing portion has a base film attached to the bottom frame via double-sided tape, a thermocompression bonding tape for fixing the base film and the light guide plate, or a fixing member that can be replaced with the thermocompression bonding tape. This makes it possible to firmly fix the light guide plate to the bottom frame.
  • thermocompression bonding tape or the fixing member is arranged between the light sources in a flying island shape discrete in the extending direction of the side of the light guide plate on the incoming light side. This makes it possible to prevent the thermocompression bonding tape or the fixing member from adversely affecting the incident light from the light source to the light guide plate.
  • thermocompression bonding tape or a spacer that surrounds at least a part of the peripheral edge of the fixing member, which is attached to the base film via double-sided tape.
  • a top frame that fits on the opening side of the bottom frame and has a rib that presses the light guide plate via a cushion material is provided on the back side of the frame portion. As a result, it is possible to strengthen the fixing of the light guide plate to the bottom frame and prevent the light guide plate from rising or shifting.
  • the optical sheet has holes that fit into the center pin at a predetermined distance from the substantially central end of the side that enters the light, and can be used as the side wall of the bottom frame or the substrate of the light source at both ends of the side that enters the light. It has one or more optical sheets that have claws that come into contact with each other and are laminated on the emission side of the light guide plate. As a result, the optical sheet can be easily fixed and rotation of the optical sheet can be prevented.
  • a predetermined distance from the top frame which is fitted to the opening side of the bottom frame and has ribs on the back side of the frame portion to press the light guide plate via the cushioning material, and the substantially central end portion of the side on the light entering side. It has a hole that fits into the center pin at the position, a notch that avoids ribs on the side of the incoming light, and a claw that contacts the side wall of the bottom frame or the substrate of the light source at both ends of the side on the incoming light side. It has a portion and includes one or more optical sheets laminated on the emission side of the light guide plate. This makes it possible to prevent the configuration for pressing the light guide plate by the ribs and cushioning material of the top frame from interfering with the configuration for fixing the optical sheet.
  • the surface of the cushion material facing the light guide plate is subjected to reflection treatment. As a result, it is possible to prevent light from leaking from the light guide plate to the cushion material side and prevent deterioration of optical characteristics.
  • the present invention is not limited to the above embodiments.
  • the present invention also includes a configuration in which the above-mentioned components are appropriately combined. Further, further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspect of the present invention is not limited to the above-described embodiment, and various modifications can be made.
  • 1 planar lighting device 2 connection part, 3 bottom frame, 3a floor part, 3b side wall, 4 reflective sheet, 5 board, 6 light source, 7 light guide plate, 7b notch part, 8 sheet fixing frame, 9 optical sheet, 9 , 9A-9C optical sheet, 9a hole, 9c notch, 9d claw, 10 top frame, 10a frame, 10b side wall, 10i rib, 11 center pin, 11a shaft, 11b head, 12 nut, 13 double-sided Tape, 14 base film, 15 spacer, 16 thermocompression bonding tape, 17 cushion material

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Planar Illumination Modules (AREA)

Abstract

La présente invention concerne un dispositif d'éclairage plan (1) qui, selon un mode de réalisation, comprend : un cadre inférieur (3) ; un évidement (7b) ; une broche centrale (11) ; et une partie de fixation. Le cadre inférieur (3) : présente une section plancher (3a) et une paroi latérale (3b) qui est dressée sur un bord périphérique de la section plancher (3a) ; et reçoit une plaque de guidage de lumière (7). L'évidement (7b) est disposé approximativement au centre du côté d'incidence de lumière de la plaque de guidage de lumière (7). La broche centrale (11) est dressée sur la section plancher (3a), et est ajustée avec l'évidement (7b). La partie de fixation fixe la plaque de guidage de lumière (7) au cadre inférieur (3) dans la plage d'une distance prédéfinie par rapport à la broche centrale (11) sur le côté d'incidence de lumière de la plaque de guidage de lumière (7).
PCT/JP2021/018548 2020-07-07 2021-05-17 Dispositif d'éclairage plan WO2022009525A1 (fr)

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CN202180032911.0A CN115552324A (zh) 2020-07-07 2021-05-17 面状照明装置
JP2021553362A JP7340028B2 (ja) 2020-07-07 2021-05-17 面状照明装置

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JP2020-117091 2020-07-07
JP2020117091 2020-07-07

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WO2022009525A1 true WO2022009525A1 (fr) 2022-01-13

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012020592A1 (fr) * 2010-08-09 2012-02-16 シャープ株式会社 Dispositif d'éclairage et dispositif d'affichage
WO2014073425A1 (fr) * 2012-11-06 2014-05-15 シャープ株式会社 Dispositif d'éclairage, dispositif d'affichage, et dispositif récepteur de télévision
JP2017117520A (ja) * 2015-12-21 2017-06-29 シャープ株式会社 面発光装置及び液晶表示装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012028142A (ja) 2010-07-22 2012-02-09 Sharp Corp 光源モジュール、およびそれを備えた電子機器
JP2012084304A (ja) 2010-10-08 2012-04-26 Sharp Corp 光源モジュールおよび電子機器
JP2020004692A (ja) 2018-06-21 2020-01-09 ミネベアミツミ株式会社 面状照明装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012020592A1 (fr) * 2010-08-09 2012-02-16 シャープ株式会社 Dispositif d'éclairage et dispositif d'affichage
WO2014073425A1 (fr) * 2012-11-06 2014-05-15 シャープ株式会社 Dispositif d'éclairage, dispositif d'affichage, et dispositif récepteur de télévision
JP2017117520A (ja) * 2015-12-21 2017-06-29 シャープ株式会社 面発光装置及び液晶表示装置

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JP7340028B2 (ja) 2023-09-06
CN115552324A (zh) 2022-12-30
JPWO2022009525A1 (fr) 2022-01-13

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