WO2014196266A1 - Cadre réfléchissant et unité de rétroéclairage - Google Patents

Cadre réfléchissant et unité de rétroéclairage Download PDF

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Publication number
WO2014196266A1
WO2014196266A1 PCT/JP2014/060278 JP2014060278W WO2014196266A1 WO 2014196266 A1 WO2014196266 A1 WO 2014196266A1 JP 2014060278 W JP2014060278 W JP 2014060278W WO 2014196266 A1 WO2014196266 A1 WO 2014196266A1
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WO
WIPO (PCT)
Prior art keywords
reflection frame
light guide
side plate
guide plate
resin foam
Prior art date
Application number
PCT/JP2014/060278
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English (en)
Japanese (ja)
Inventor
西脇　利光
Original Assignee
古河電気工業株式会社
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 古河電気工業株式会社 filed Critical 古河電気工業株式会社
Publication of WO2014196266A1 publication Critical patent/WO2014196266A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133608—Direct backlight including particular frames or supporting means

Definitions

  • the present invention relates to a light guide plate type reflection frame and a backlight unit used in a liquid crystal panel.
  • a backlight unit that emits light by illuminating light from the back side of the liquid crystal layer is used.
  • an edge light type backlight unit that can reduce the number of light sources and is advantageous for energy saving is increasing.
  • Such an edge light type backlight unit is required to have uniform luminance over the entire light emission surface.
  • a reflector is laminated on the light guide plate of the edge light type backlight unit.
  • the reflecting plate has a role of increasing the luminance by returning the amount of light guided from the light source into the light guide plate to the reflecting plate side to the liquid crystal layer side.
  • an edge light type backlight unit there is an edge light type backlight structure in which a reflection plate in which a metal plate is laminated on a reflection sheet is formed and the reflection plate is closely attached to the bottom surface and a pair of side surfaces of the light guide plate. is there.
  • the luminance of the backlight unit is demanded from the request of energy saving.
  • the use of the light source can be reduced and the power consumption can be reduced.
  • One method for improving the luminance of the backlight unit is to reduce light leakage.
  • the luminance of the backlight unit can be improved by suppressing light leakage from the side surface of the light guide plate and the gap between the light source and the reflector.
  • Patent Document 1 light from a light source is incident from a hole formed in a reflector. Therefore, the reflector and the reflecting plate are integrated. However, in the case where the reflector is bent as in Patent Document 1, light leakage from the gap between the bent portions cannot be prevented.
  • a reflection plate in which a metal plate and a reflection film are laminated may be warped or deformed due to thermal expansion due to heat from the light source or the influence of the difference in thermal expansion, and there is a risk that light leakage will increase.
  • the present invention has been made in view of such problems, and an object thereof is to provide a reflection frame or the like that can improve the luminance of a backlight unit.
  • a first invention is a reflection frame for a backlight unit made of a resin foam, and the reflection frame is a box shape that is open on one side and can accommodate a light guide plate. And a hole for light source is formed in the side plate portion, and a boundary between the side plate portions is closed without a gap.
  • the reflection frame is made of a resin foam, there is no problem of warpage or deformation as in the case of a conventional reflection plate in which a metal plate and a reflection film having different thermal expansion coefficients are laminated. .
  • the resin foam has a characteristic of being shrunk minutely by heat
  • the reflective frame of the present invention made of resin foam has a dimension in the direction in which it is in close contact with the light guide plate by the heat generated when the backlight panel is used. There is a tendency to change.
  • the box-type reflective frame which consists of a resin foam of this invention, the light leakage from a backlight panel can be reduced more.
  • the reflection frame is box-shaped and no gap is formed at the boundary between the side plate portions of the reflection frame, there is no light leakage from the gap and high luminance can be obtained. For this reason, a light source and power consumption can be reduced.
  • the reflection frame is formed by molding a resin foam material into a mold shape, and is preferably a box shape in which all surfaces are continuously integrated.
  • the reflection frame integrally, the manufacturability is good, and the gap at the boundary between the side plate portions can be reliably closed.
  • the reflection frame may be formed by bending a resin foam material having a shape developed from a box shape into a box shape, and joining these side plate portions so as to close corners formed by adjacent side plate portions. .
  • a means for joining adjacent side plate portions there is a tape or an adhesive. If the side plate portions are joined together, a gap generated by bending the material can be closed, and light leakage from the corner portion can be reduced.
  • a tongue piece may be provided on the side plate portion, and when the resin foam material is bent into a box shape, means for superimposing the tongue pieces on adjacent side plate portions may be employed.
  • the gap generated by bending the material can be surely closed by the material itself.
  • a convex portion for preventing the light guide plate from being in close contact is formed on the inner surface of the reflective frame.
  • the reflection frame is preferably formed of a resin foam material obtained by foaming an amorphous thermoplastic resin sheet.
  • a resin foam material obtained by foaming an amorphous thermoplastic resin sheet such as polycarbonate has good moldability. For this reason, it is easy to mold the reflective frame into the desired shape. In particular, it is easy to form the convex portion for preventing adhesion as described above at the time of molding the material.
  • a second invention provides light to the light guide plate from a reflection frame according to the first invention, a light guide plate housed in the box-shaped reflection frame, and a hole provided in a side plate portion of the reflection frame. And a light source for irradiation.
  • FIG. 3 is an exploded perspective view showing the configuration of the backlight unit 1.
  • 2A is a cross-sectional view of the backlight unit 1
  • FIG. 2B is an enlarged view of a portion A in FIG. 2A.
  • 4A is a partial cross-sectional view showing a state before molding the resin foam material 17c
  • FIG. 4B is a partial cross-sectional view showing a state in which the reflection frame 5 is formed by the upper mold 18a and the lower mold 18b.
  • FIG. 4C is a cross-sectional view of the backlight unit 1c.
  • FIG. 5A is a development view of the resin foam material 17
  • FIG. 5B is a perspective view showing the reflection frame 5a.
  • FIG. 6A is a development view of a resin foam material 17a
  • FIG. 6B is a perspective view showing a reflection frame 5b. It is a figure which shows other embodiment, and the expanded view of the resin foam raw material 17b.
  • 8A is a cross-sectional view of the backlight unit 1a
  • FIG. 8B is an enlarged view of a portion B in FIG. 8A.
  • FIG. 1 is an exploded perspective view showing a backlight unit 1 used in a liquid crystal display device and the like
  • FIG. 2 is a cross-sectional view.
  • the backlight unit 1 is a so-called edge light type backlight unit, and mainly includes a reflective frame 5, a light source 11, a light guide plate 13, and the like.
  • the reflection frame 5 is a box-shaped member.
  • the reflection frame 5 is a porous body having closed cells inside, and is formed of a resin foam.
  • the reflection frame 5 is integrally formed using a sheet-like resin foam material. Therefore, the boundaries of all the surfaces (the bottom surface and the side plate portions 7a and 7b) of the reflection frame 5 are integrally formed without any gap.
  • a plurality of beads 23 are provided on the surface of the reflection frame 5 (the surface facing the light guide plate 13).
  • the beads 23 are, for example, silicone particles or calcium carbonate particles.
  • illustration of the bead 23 is abbreviate
  • the reflective frame 5 has a foam layer 27 inside, and has an unfoamed layer 29 on the front and back surfaces.
  • the unfoamed layer 29 may be formed only on the surface facing the light guide plate 13.
  • a large number of fine bubbles 25 are formed in the foam layer 27.
  • the average diameter of the fine bubbles 25 is 0.1 to 10.0 ⁇ m, the reflectance of the reflection frame 5 is good.
  • the fine bubbles 25 are not present, or even if there are, the amount thereof is sufficiently smaller than that of the foamed layer 27.
  • a bead coat layer 28 is provided on the surface of the reflective frame 5 (unfoamed layer 29).
  • the bead coat layer 28 is formed by applying a coating agent containing the beads 23. Note that the bead coat layer 28 is not necessarily required as long as the beads 23 can be held on the surface of the reflective frame 5.
  • the beads 23 form convex portions on the surface of the reflection frame 5.
  • the shape of the bead 23 may be various three-dimensional shapes such as a sphere, an ellipsoid, and a polyhedron, but is preferably a sphere.
  • the resin foam material used for the reflective frame 5 is formed by foaming a thermoplastic resin sheet.
  • the thermoplastic resin used in the present invention is not particularly limited, but the crystalline thermoplastic resin may be a crystalline thermoplastic polyester resin such as polyethylene terephthalate, or an amorphous thermoplastic resin.
  • polycarbonate can be used.
  • polycarbonate is desirable in consideration of the moldability of the resin foam material. Details of the method for producing the resin foam material will be described later.
  • a light source 11 is disposed on the outer surface of each side plate portion 7b of the reflection frame 5.
  • the light source 11 for example, an LED (Light Emitting Diode), CCFL (Cold Cathode Fluorescent Lamp), or the like can be used. Composed by arranging.
  • Each of the pair of side plate portions 7b facing the reflection frame 5 is provided with a plurality of holes 9 penetrating the side plate portion 7b.
  • the hole 9 is a part where the point light source of the light source 11 is arranged. Therefore, the hole 9 is formed at a position corresponding to each point light source of the light source 11.
  • the hole 9 is preferably drilled to a size that is not affected by the heat of the point light source. If the hole size is small, the reflection frame 5 may be deformed by the influence of the heat of the point light source.
  • the light guide plate 13 is accommodated in the reflection frame 5. That is, the reflection frame 5 has a box shape that can accommodate the light guide plate 13.
  • the light guide plate 13 has a flat plate shape, and the light emission surface (the side on which the liquid crystal panel not shown is arranged on the upper surface side in FIG. 2) is configured to be smooth.
  • a highly light guide transparent material such as acrylic resin, polycarbonate resin, or cyclic olefin resin can be used.
  • the back surface side (the lower surface side in FIG. 2 and the reflective frame 5 side) of the light guide plate 13 may be subjected to a diffusion pattern with a white ink for light diffusion or a fine unevenness process.
  • An optical film 15 is provided on the light exit surface side of the light guide plate 13 as necessary.
  • the optical film 15 is configured by laminating films having a plurality of functions.
  • a light diffusion film for making the surface brightness of the backlight unit 1 uniform or a prism sheet for improving brightness are used.
  • the reflective frame 5, the light source 11, the light guide plate 13, the optical film 15 and the like are held by the back chassis 3.
  • the back chassis 3 is manufactured, for example, by metal plate pressing a metal plate.
  • a liquid crystal panel (not shown) is arranged on the front surface, and fitted and fixed by a front chassis (not shown), whereby a liquid crystal display device is manufactured.
  • the method for producing the resin foam sheet include a stretching method, a batch foaming method, and an extrusion foaming method.
  • a polycarbonate resin PCX-5711 manufactured by Sumika Stylon
  • a crystallization nucleating agent manufactured by Shin Nippon Rika
  • a mixture of NU100 is melt-kneaded using a kneader to prepare a resin composition.
  • the resin composition is formed into a sheet using an extruder or the like, and the resin sheet and the separator are overlapped and wound into a roll.
  • the resin sheet contains an inert gas. Furthermore, the resin sheet containing the inert gas is heated to a temperature higher than the glass transition temperature (Tg) of the polycarbonate resin under normal pressure to be foamed. Thus, a fine foamed polycarbonate sheet can be obtained.
  • Tg glass transition temperature
  • the said manufacturing method is an example and in this invention, the raw material and manufacturing method of a resin foam raw material are not specifically limited.
  • beads 23 previously kneaded into the material composition may be foamed, or after the resin foam material is manufactured, the beads 23 may be blended into the coating agent and applied to the surface of the resin foam material.
  • the beads 23 may be removed during stretching. Since there is a fear, it is desirable to apply the beads 23 after the foaming treatment.
  • reflection frame manufacturing method Next, a method for forming the reflection frame 5 will be described.
  • the finely foamed polycarbonate sheet produced by the above-described method is preheated. Preheating is performed by disposing far infrared heaters above and below the finely foamed polycarbonate sheet.
  • the micro-foamed polycarbonate sheet is an amorphous resin, there is a possibility that the internal bubbles formed in the foaming process expand due to heat and swell on the sheet surface. Therefore, preheating is performed in a short time of 6 to 10 seconds.
  • the heating temperature is preferably preheated so that the sheet surface temperature in the radiation thermometer becomes 150 to 160 ° C., which is a temperature near the glass transition temperature. This is because molding cracks are likely to occur at 150 ° C. or lower, and coarse bubbles and blisters are likely to occur at 160 ° C. or higher.
  • the preheated fine foamed polycarbonate sheet is conveyed to a heating mold.
  • the fine foamed polycarbonate sheet is formed into a box shape by a match mold forming method in which the finely foamed polycarbonate sheet is sandwiched between upper and lower heating molds and formed into a predetermined shape, for example.
  • the box-shaped reflective frame 5 is manufactured by cooling using air blow.
  • the heating temperature of the mold is preferably 100 to 120 ° C., which is a temperature below the glass transition temperature of the polycarbonate so that the cooling does not rapidly cool from the preheating temperature. If the temperature of the mold exceeds 160 ° C., which is a temperature higher than the glass transition temperature, the expansion of internal bubbles may occur as in the case of preheating, and the molding surface may be swollen. In addition, after shaping
  • the preheating temperature may be 200 to 220 ° C. as the sheet surface temperature, and the mold temperature may be 170 to 180 ° C.
  • the method for forming the reflective frame 5 is not limited to the match mold method.
  • plug-assisted vacuum forming in which after forming a sheet using a pressure or air forming using a single concave or convex mold, vacuum forming, vacuum pressure forming or a plug, the sheet is stretched
  • known molding methods such as plug-assisted pressure forming and plug-assisted vacuum / pressure forming may be used.
  • the match mold forming method has the best mold transferability in sheet forming.
  • the box-shaped reflection frame 5 in which the light guide plate 13 is fitted is manufactured.
  • the boundary between the side plate portion and the bottom surface of the reflection frame 5 is integral and closed. For this reason, light leakage from the side surface of the light guide plate 13 or the like can be prevented.
  • a white paint solar ink LED development type high reflection white solder resist
  • a reflective substrate Shin-Kobe Electric CEL-447WT.
  • the light incident on the reflection frame 5 is totally reflected or diffused at the interface with a large number of fine bubbles 25 (the inside is, for example, an air layer and the refractive index is smaller than that of the resin constituting the reflection frame 5).
  • the light is emitted to the light guide plate 13 side.
  • the light reflected on the surface of the reflection frame 5 or diffused inside returns to the inside of the light guide plate 13, and part of the light is totally reflected again on the front surface of the light guide plate 13, and the remaining light is reflected on the front surface of the light guide plate 13. To exit. In this way, light can be uniformly emitted from the entire front surface of the backlight unit.
  • the reflection frame 5 of this embodiment is formed in a box shape so as to cover the side surface of the light guide plate 13 and maintains the shape for accommodating the light guide plate 13 by itself without using a metal plate or the like, The occurrence of warpage due to the difference in thermal expansion coefficient can be avoided, and the problem of light leaking from the gap with the light guide plate can be reduced.
  • the reflective frame 5 of this embodiment is formed of a resin foam having a characteristic of being shrunk slightly by heat, when the backlight unit 1 is used, heat generated from an electrical component or the like is used. The reflective frame 5 changes its dimension in the direction in which it is in close contact with the light guide plate 13.
  • the gap (particularly the side portion) between the reflection frame 5 and the light guide plate 13 becomes narrower, and it can be expected that light leakage is reduced. Further, in the reflection frame 5 of this embodiment, there is no gap at the boundary between adjacent side plate portions, and the corners formed by the adjacent side plate portions are closed. Accordingly, light leakage from the side surface of the light guide plate 13 can be suppressed to a higher degree.
  • the gap between the side surface of the light guide plate 13 and the side plate portion 7b (7a) of the reflection frame 5 is also provided.
  • a gap due to the beads 23 is maintained.
  • light leakage from a gap on the side surface of the light guide plate 13 or the like can be prevented by a tape or a frame plate.
  • the reflection frame 5 in which the beads 23 of the first embodiment described above exist on the entire surface has been described.
  • the beads 23 exist only on the inner bottom surface 7t of the reflection frame 5 as in the backlight unit 1b illustrated in FIG. You may do it.
  • Such a reflection frame can be manufactured by forming a resin foam material into a box shape and then applying a paint containing beads only on the bottom surface 7t.
  • the side plate portion 7b (7a) of the reflection frame 5 and the side surface of the light guide plate 13 and the like can be brought into close contact with each other, light leakage from the side surface of the light guide plate 13 can be prevented.
  • a convex portion may be formed only on the inner bottom surface 7t at the time of match molding.
  • the resin foam material 17c having the beads 23 provided on the entire surface of one surface is set between the upper mold 18a and the lower mold 18b.
  • the upper mold 18a is lowered (arrow B in FIG. 4A) to form the box-shaped reflection frame 5 (FIG. 4B).
  • the gap C between the upper mold 18a and the lower mold 18b at the position corresponding to the side plate portion 7b (7a) is set to be narrower than the gap of the portion corresponding to the bottom surface 7t. More specifically, the gap C of the part corresponding to the side plate portion 7b (7a) is adjusted in consideration of only the resin thickness of the side plate portion 7b. Further, the gap of the portion corresponding to the bottom surface 7t is adjusted in consideration of the protrusion margin of the beads 23 in addition to the resin thickness of the bottom surface 7t.
  • FIG. 4C shows a backlight unit 1c using the reflection frame 5 formed as described above.
  • the backlight unit 1c has a convex portion formed by the beads 23 on the bottom surface 7t, and the light guide plate 13 and the reflection frame 5 are prevented from contacting each other.
  • the bead 23 is embedded in the side plate portion 7b (7a)
  • the inner surface becomes substantially flat, and a gap can be prevented from being formed between the side plate portion 7b (7a) and the light guide plate 13 or the like.
  • the side plate portion 7b (7a) of the reflection frame 5 and the side surface of the light guide plate 13 and the like can be brought into close contact with each other, so that light leakage from the side surface of the light guide plate 13 can be prevented.
  • the resin foam raw material 17 is made into a box-shaped expansion
  • the side plate portions 7a and 7b are bent into a box shape.
  • the side plates 7a and 7b adjacent to each other are joined by the tape 19 so that they are in contact with each other, and the corners are closed. That is, the gap at the boundary between the side plate portions 7a and 7b is closed.
  • the side plate portions 7a and 7b may be joined with an adhesive in a state where the gap between the side plate portions 7a and 7b is closed.
  • a convex portion is formed by beads 23 on the inner surface of the reflection frame 5.
  • the reflection frame 5a formed in this way can obtain the same effects as the reflection frame 5. Moreover, when making into a box shape, preheating is unnecessary and a molding die is also unnecessary.
  • Fig.6 (a) you may use the resin foam raw material 17a which provided the tongue piece 21 in a part of site
  • the resin foam material 17a is formed by extending both ends of a portion corresponding to the side plate portion 7b.
  • the gap between the side plate portions 7a and 7b can be closed by folding the resin foam material 17a into a box shape and folding the tongue piece 21 on the adjacent side plate portion 7a side to overlap. it can.
  • the tongue piece 21 may be joined to the outer surface of the side plate portion 7a with an adhesive or the like.
  • both end portions of the side plate portion 7b are extended to provide the tongue piece 21, but the position of the tongue piece 21 is not limited to this, and the resin foam material 17a is adjacent to the box shape. As long as the space between the side plate portions can be closed by overlapping the side plate portions, they may be formed at any position.
  • the reflection frame 5b formed in this way can obtain the same effects as the reflection frame 5a. Further, since the member that closes the gap is the same as the material constituting the reflection frame 5a, light can be reliably reflected even at the boundary portion.
  • the reflective frame 5c shown in FIG. 8 may be created by using a resin foam material 17b in which a plurality of convex portions 31 are formed as shown in FIG. 7 by embossing or a mold having concave portions.
  • the resin foam material 17b has a convex portion 31 only on the inner bottom surface 7t when assembled into a box shape, that is, only the bottom surface 7t facing the back surface of the light guide plate 13 when the light guide plate 13 is placed in the reflection frame 5c. Is formed.
  • FIG. 8 (a) shows a backlight unit 1a manufactured using a reflective frame 5c made of the resin foam material 17b.
  • a predetermined gap is maintained between the light guide plate 13 and the reflection frame 5c by the convex portion 31 provided on the reflection frame 5c. For this reason, the effect of white spot prevention etc. can be acquired like the bead 23 mentioned above.
  • the resin foam material 17b is configured in the same shape as the resin foam material 17 shown in FIG. 5A, but the tongue piece 21 is formed like the resin foam material 17a shown in FIG. 6A. May be.
  • the box-shaped reflection frame 5c may be formed from a single resin foam material by molding such as a match mold molding method.
  • the convex part 31 can be easily formed by forming a plurality of concave parts on the mold surface used at the time of molding.

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

Abstract

L'invention concerne une unité de rétroéclairage (1), ladite unité de rétroéclairage utilisant un procédé dit de lumière à contre-jour, et comporte principalement un cadre réfléchissant (5), une source de lumière (11), une plaque de guide de lumière (13) et similaire. Le cadre réfléchissant (5) est un élément en forme de boite. Le cadre réfléchissant (5) est un corps poreux possédant des cellules fermées, et est formé à partir d'un corps de mousse de résine. Le cadre réfléchissant (5) est formé d'un seul tenant en utilisant un matériau de mousse de résine stratiforme. Par conséquent, toutes les bordures avec les surfaces (surface du bas et parties de côté de la plaque (7a, 7b)) du cadre réfléchissant (5) sont formées à partir d'un unique tenant sans aucun espace.
PCT/JP2014/060278 2013-06-07 2014-04-09 Cadre réfléchissant et unité de rétroéclairage WO2014196266A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013120812A JP2014238968A (ja) 2013-06-07 2013-06-07 反射フレームおよびバックライトユニット
JP2013-120812 2013-06-07

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WO2014196266A1 true WO2014196266A1 (fr) 2014-12-11

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JP (1) JP2014238968A (fr)
TW (1) TW201502666A (fr)
WO (1) WO2014196266A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105093637A (zh) * 2015-09-22 2015-11-25 深圳市华星光电技术有限公司 一种用于液晶显示器中的前框及其成型方法

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