WO2009107275A1 - バックライトユニットおよび液晶表示装置 - Google Patents
バックライトユニットおよび液晶表示装置 Download PDFInfo
- Publication number
- WO2009107275A1 WO2009107275A1 PCT/JP2008/069001 JP2008069001W WO2009107275A1 WO 2009107275 A1 WO2009107275 A1 WO 2009107275A1 JP 2008069001 W JP2008069001 W JP 2008069001W WO 2009107275 A1 WO2009107275 A1 WO 2009107275A1
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- WO
- WIPO (PCT)
- Prior art keywords
- mounting substrate
- backlight unit
- pressing piece
- housing
- mounting
- Prior art date
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—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
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0085—Means for removing heat created by the light source from the package
-
- 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
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
-
- 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
- G02B6/0066—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 characterised by the light source being coupled to the light guide
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
-
- 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
- G02B6/0066—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 characterised by the light source being coupled to the light guide
- G02B6/0073—Light emitting diode [LED]
-
- 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
- G02F1/133628—Illuminating devices with cooling means
Definitions
- the present invention relates to a backlight unit including a mounting substrate on which a light emitting element is mounted, and a liquid crystal display device including the backlight unit.
- the backlight unit includes a light source that emits light.
- the backlight unit 149 disclosed in Patent Document 1 uses a light emitting diode (LED) 112 mounted on a mounting substrate 111 as a light source, as shown in the cross-sectional view of FIG.
- the LED 112 causes light to enter the light guide plate 141, and the light travels toward the liquid crystal display panel 159 through the light guide plate 141, the reflection sheet 142, and the optical sheet group 146.
- LED light emitting diode
- Such light is generated by driving the LED 112, and the LED 112 generates heat with this driving.
- Such heat causes the LED 112 to deteriorate (for example, the light emission efficiency of the LED 112 decreases or the life of the LED 112 decreases). Further, the heat applied to the LEDs 112 is also transmitted to the mounting substrate 111, and the mounting substrate 111 deteriorates early due to the heat, and may be warped.
- the backlight unit 149 described in Patent Document 1 causes the mounting substrate 111 on which the LEDs 112 are mounted to contact the heat sink substrate 172 via the heat dissipation sheet 171. In this case, the heat of the LED 112 escapes to the heat dissipation sheet 171 and the heat sink substrate 172 without staying on the LED 112 and the mounting substrate 111.
- the backlight unit 149 when used for a long time, the heat radiation using only the heat radiation sheet 171 and the heat sink substrate 172 cannot be dealt with.
- the mounting substrate 111 may warp. Therefore, in the backlight unit 149 of Patent Document 1, the LED 112 and the mounting substrate 111 are sandwiched between the light guide plate 141 and the heat sink substrate 172, and the mounting substrate 111 is further sandwiched between the housing 125 of the backlight unit 149 and the heat sink substrate 172. Is inserted.
- the screw 173 may fasten the housing 121 of the backlight unit 149 and the mounting substrate 111. It is conceivable (in FIG. 9, the cross-sectional direction is the cross-sectional direction along the line aa ′ in FIG. 8, and the liquid crystal display panel 159 is also shown). JP 2006-111242 A
- the light emitting surface of the LED 112 must be in close contact with the side surface of the light guide plate 141. This is a design constraint. For example, even if the light emitting surface of the LED 112 is separated from the side surface of the light guide plate 141 in order to suppress the light amount unevenness generated in the light from the backlight unit 149 (backlight light), the design becomes impossible.
- tapping (forming a screw hole 174) has to be performed on the mounting substrate 111 including wiring such as electrodes for the LED 112.
- the screw 173 is formed of a conductive material such as metal, the cost of tapping becomes extremely high in order to prevent leakage.
- An object of the present invention is to provide a backlight unit that can be manufactured easily and inexpensively while increasing the degree of freedom of LED arrangement, and a liquid crystal display device including the backlight unit.
- the backlight unit includes a light emitting element, a mounting substrate on which the light emitting element is mounted, a light guide plate that receives light from the light emitting element and transmits the light to the outside, and the light emitting element, the mounting substrate, and the light guide plate And a housing for housing.
- the housing includes a separate housing portion for sandwiching the light guide plate, and one housing portion releases heat by driving the light emitting device to release heat from the light emitting device and the mounting board.
- a flexible pressing piece is formed on the other housing part, and the pressing piece presses the mounting substrate against the one housing part.
- the mounting board on which the light emitting element is mounted is pressed against one housing part which is also a heat radiating part by pressing caused by the flexible pressing piece (note that the housing part and the mounting part are mounted). It may be in direct contact with the substrate or indirect contact with another member). Therefore, the heat caused by the light emitting element is not limited to the light emitting element and the mounting substrate.
- the pressing piece is manufactured at a low cost when it is integrally formed with the other housing portion, for example. Therefore, the cost of this backlight unit is reduced. Further, the presence of the pressing piece makes the light emitting element immobile at a desired position with respect to the light guide plate. Therefore, the freedom degree of arrangement
- the holding piece is in contact with the mounting surface of the mounting board so that the mounting board is pressed against one housing part.
- the pressing by the pressing piece is efficiently applied to the mounting surface, and the non-mounting surface, which is the back surface of the mounting surface, is efficiently pressed to one housing part.
- the pressing piece is formed of an insulating material in order to prevent leakage and the like.
- the holding piece is formed of an insulating material in this way, the area in contact with the mounting surface on which the wiring is formed tends to increase. Therefore, the mounting substrate is stably pressed against the one housing part.
- the positions in the board surface of the mounting board that are pressed by the holding pieces are the middle and both ends in the longitudinal direction of the mounting board.
- the pressing piece can be pressed evenly over the entire length of the mounting board. Therefore, the mounting substrate is pressed against the one housing portion more stably.
- the backlight unit it is desirable that one of the long sides of the mounting board and the pressing piece are engaged with each other, and the other long side of the mounting board and one of the housing portions are engaged.
- one fitting part is formed on the mounting board and the other fitting part is formed on one housing part among the first fitting part and the second fitting part that fit each other, Engagement between the other longitudinal part and one housing part is realized.
- the mounting substrate and the one housing portion are immovable by fitting between the fitting portions (the first fitting portion and the second fitting portion). For this reason, even if the mounting substrate is warped, it is difficult to separate from the one housing portion.
- the kind of fitting part is not specifically limited.
- the first fitting portion may be a protrusion
- the second fitting portion may be an opening into which the protrusion fits, or of course other types of fitting portions.
- fitting parts are formed on the mounting board and one housing part corresponding to the in-plane position of the mounting board pressed by the pressing piece.
- the holding piece and the mating part combine to press the mounting board against one housing part. Therefore, the mounting board is reliably pressed against the one housing part.
- an adhesive is interposed between the non-mounting surface of the mounting board and one housing part.
- the mounting substrate and the one housing part are easily in close contact with each other.
- the adhesive is formed of a material having high thermal conductivity, it is possible to release heat from the light emitting element.
- a liquid crystal display device including the above backlight unit and a liquid crystal display panel that receives light from the backlight unit can be said to be the present invention.
- the pressure is applied to the mounting board, and the mounting board is pressed against one housing part which is also a heat radiating part. Therefore, the heat of the light emitting element can be easily and reliably escaped from the light emitting element and the mounting substrate only with a simple member such as a pressing piece.
- FIG. 3 is an exploded perspective view of a backlight unit included in the liquid crystal display device.
- FIG. 2 is a cross-sectional view of a liquid crystal display device including the backlight unit of FIG. 1 (however, the cross-sectional direction is the cross-sectional direction taken along the line A-A ′ in FIG. 1).
- FIG. 2 is an exploded perspective view of a backlight unit different from the backlight unit of FIG. 1.
- FIG. 4 is an exploded perspective view of a backlight unit different from the backlight unit of FIGS. 1 and 3. These are the expansion perspective views of the pressing piece vicinity in a top-shaped housing part.
- FIG. 5B is a side view of FIG. 5A.
- FIG. 3 is a side view of a holding piece including a potch.
- FIG. 5B is a side view of FIG. 5A.
- FIG. 3 is a side view of a holding piece including a potch.
- FIG. 5 is an exploded perspective view of a backlight unit different from the backlight units of FIGS. 1, 3, and 4.
- FIG. 8 is an exploded perspective view of a backlight unit of a conventional liquid crystal display device different from FIG. 7.
- FIG. 9 is a cross-sectional view of a liquid crystal display device including the backlight unit of FIG. 8 (however, the cross-sectional direction is the cross-sectional direction taken along line a-a ′ in FIG. 1).
- MJ LED module 11 mounting substrate 11a mounting surface 11b non-mounting surface PN protrusion (first fitting portion) 12 LED (light emitting element) BD Adhesive HG Housing 21 Bottom type housing part (one housing part, heat radiation part) 22 Bottom HL Opening (second fitting part) 23 inner wall 25 top housing part (the other housing part) PP pressing piece PPr base of pressing piece PPe tip of pressing piece PPt potch 26 outer wall 27 bridging plate 28 passage port 41 light guide plate 42 reflecting sheet 43 diffusion sheet 44 optical sheet 45 optical sheet 49 backlight unit 59 liquid crystal display panel 69 liquid crystal display device
- FIG. 1 is an exploded perspective view of the backlight unit 49 in the liquid crystal display device
- FIG. 2 is a cross-sectional view of the liquid crystal display device 69 (note that the cross-sectional direction of FIG. 2 is taken along the line AA ′ in FIG. View direction).
- the liquid crystal display device 69 includes a liquid crystal display panel 59 and a backlight unit 49.
- an active matrix substrate 51 including a switching element such as a TFT (Thin Film Transistor) and a counter substrate 52 facing the active matrix substrate 51 are bonded together with a sealant (not shown). Then, liquid crystal (not shown) is injected into the gap between the substrates 51 and 52 (the deflection films 53 and 54 are attached so as to sandwich the active matrix substrate 51 and the counter substrate 52).
- a switching element such as a TFT (Thin Film Transistor)
- a counter substrate 52 facing the active matrix substrate 51 are bonded together with a sealant (not shown).
- liquid crystal (not shown) is injected into the gap between the substrates 51 and 52 (the deflection films 53 and 54 are attached so as to sandwich the active matrix substrate 51 and the counter substrate 52).
- this liquid crystal display panel 59 is a non-light emitting display panel, it receives a light (backlight light) from the backlight unit 49 and exhibits a display function. Therefore, if the light from the backlight unit 49 can uniformly irradiate the entire surface of the liquid crystal display panel 59, the display quality of the liquid crystal display panel 59 is improved.
- the backlight unit 49 includes an LED module (light source module) MJ, a light guide plate 41, a reflection sheet 42, a diffusion sheet 43, optical sheets 44 and 45, and a housing HG in order to generate backlight light.
- LED module light source module
- the LED module MJ is a module that emits light, and includes a mounting substrate (supporting substrate) 11 and an LED (Light Emitting Diode) 12 that emits light upon being supplied with current by being mounted on an electrode of the mounting substrate 11. Including.
- the LED module MJ preferably includes a plurality of LEDs (light emitting elements, point light sources) 12 in order to secure the amount of light, and further preferably the LEDs 12 are arranged in parallel. However, in the drawings, only some of the LEDs 12 are shown for convenience (hereinafter, the direction in which the LEDs 12 are arranged is referred to as a parallel direction P).
- the light guide plate 41 is a plate-like member having a side surface 41S and a top surface 41U and a bottom surface 41B positioned so as to sandwich the side surface 41S. Then, one surface (light receiving surface) of the side surface 41S faces the light emitting surface of the LED 12, and receives light from the LED 12. The received light is mixed inside the light guide plate 41 and emitted from the top surface 41U as planar light.
- the reflection sheet 42 is positioned so as to be covered by the light guide plate 41. Then, one surface of the reflection sheet 42 facing the bottom surface 41B of the light guide plate 41 becomes a reflection surface. Therefore, the reflection surface reflects the light from the LED 12 and the light propagating through the light guide plate 41 so as to return to the light guide plate 41 (specifically, through the bottom surface 41B of the light guide plate 41) without leaking.
- the diffusion sheet 43 is positioned so as to cover the top surface 41U of the light guide plate 41, diffuses the planar light from the light guide plate 41, and spreads the light throughout the liquid crystal display panel 59 (Note that this diffusion sheet) 43 and the optical sheets 44 and 45 are collectively referred to as an optical sheet group 46).
- the optical sheets 44 and 45 are, for example, optical sheets that have a prism shape in the sheet surface and deflect light emission characteristics, and are positioned so as to cover the diffusion sheet 43. Therefore, the optical sheets 44 and 45 collect the light traveling from the diffusion sheet 43 and improve the luminance. In addition, the divergence direction of each light condensed by the optical sheet 44 and the optical sheet 45 is in a relation of crossing.
- the housing HG includes a box-shaped bottom housing portion (one housing portion, a heat radiating portion) 21 having a bottom, and a lid-like top housing portion (the other housing portion) 25 covering the bottom housing portion 21.
- the bottom housing 21 accommodates the LED module MJ, the reflection sheet 42, the light guide plate 41, the diffusion sheet 43, the optical sheets 44 and 45, and the like.
- the reflection sheet 42, the light guide plate 41, the diffusion sheet 43, and the optical sheets 44 and 45 are stacked in this order and accommodated in the bottom housing 21 (hereinafter, the stacking direction of these members is referred to as the stacking direction).
- Q is a direction R perpendicular to the parallel direction P of the LEDs 12 and the overlapping direction Q).
- the bottom mold housing portion 21 includes a bottom portion 22 that supports a member (light guide plate 41 and the like) to be accommodated, and an inner wall 23 that rises from the bottom portion 22. Further, the bottom housing portion 21 is formed of a material having a relatively high heat dissipation property such as metal.
- the inner wall 23 of the bottom housing 21 (more specifically, the inner side surface 23N of the inner wall 23) is in direct contact with the back surface (non-mounting surface 11b) of the mounting substrate 11 or indirectly through the adhesive BD. Therefore, when the LED 12 is driven, the heat generated in the LED 12 and the mounting substrate 11 escapes through the bottom housing 21 (hereinafter, the inner wall 23 and the mounting substrate 11 come into contact with each other via the adhesive BD). I will explain an example).
- the inner wall 23 of the bottom housing 21 and the mounting substrate 11 must be in reliable contact (direct contact or indirect contact). Therefore, the following should be used.
- the top housing 25 is preferably as follows. That is, the top housing portion 25 includes an outer wall 26 that contacts the outer surface 23T of the inner wall 23 in the bottom housing portion 21, and a bridge plate 27 that spans the outer walls 26 (the bridge plate 27 is , Including a passage port 28 through which light passes.
- the top housing portion 25 covers the bottom housing portion 21
- the bridging plate 27 in the top housing portion 25 is supported by the tip 23 ⁇ / b> E of the inner wall 23 in the bottom housing portion 21, and the top housing portion 25
- the inner side surface 26N of the outer wall 26 is in contact with the outer side surface 23T of the inner wall 23 in the bottom mold housing portion 21.
- the top-shaped housing part 25 is engaged with the bottom-type housing part 21 and is immovable.
- a flexible pressing piece PP is formed on the top housing portion 25.
- the pressing piece PP extends in the same direction as the extending direction of the outer wall 26 from one end of the bridging plate 27 that is separated from the outer wall 26 by a certain distance, thereby generating a gap W between which the member is sandwiched (see FIG. However, the length of the interval W is changed according to one end in the longitudinal direction of the pressing piece PP).
- this interval W (however, the shortest interval W) is slightly shorter than the combined length of the thickness of the inner wall 23 of the bottom housing 21, the thickness of the adhesive BD, and the thickness of the mounting substrate 11.
- the pressing piece PP is in contact with the mounting substrate 11, the pressing piece PP is formed at a location where the top housing portion 25 covered by the bottom housing portion 21 does not face the LED 12 on the mounting substrate 11. Is done.
- the number of the pressing pieces PP is not particularly limited. For example, as shown in FIG. 1, a plurality of pressing pieces PP are formed in the top housing portion 25.
- the top housing 25 covers the bottom housing 21 to which the LED module MJ is attached, the bottom housing 21 adjacent to each other via the adhesive BD is covered.
- the outer surface 23T of the inner wall 23 and the inner side surface 26N of the outer wall 26 of the top housing portion 25 come into contact with each other, and the mounting surface 11a of the mounting substrate 11 and the top housing portion 25 The pressing piece PP in contact with.
- the pressing piece PP hits the mounting substrate 11 and bends toward the passage opening 28 of the bridge plate 27, the interval W is widened.
- the inner wall 23 of the bottom mold housing portion 21, the adhesive BD, and The mounting substrate 11 of the LED module MJ is accommodated.
- the pressing piece PP presses the mounting substrate 11 and the adhesive material BD against the outer wall 26 by the elastic force (pressing) of the pressing piece PP having flexibility.
- the adhesive force of the adhesive BD is weakened due to long-time use
- the mounting substrate 11 is warped from the adhesive BD, and the mounting substrate 11 is separated from the inner wall 23 of the bottom housing 21. Even so, the mounting substrate 11 is pressed against the inner wall 23 by the pressing piece PP. Then, the heat generated in the LED 12 and the mounting substrate 11 is surely escaped to the inner wall 23. Therefore, the LED 12 is not deteriorated by heat and can be driven for a long time. In addition, deterioration due to heat generated in the mounting substrate 11 is less likely to occur.
- such a pressing piece PP can be manufactured extremely cheaply when it is molded integrally with the resin-made top housing 25.
- the pressing piece PP is a resin, the area in contact with the mounting surface on which the conductive wiring is formed is likely to increase (for example, the entire length of the pressing piece PP may be increased). Therefore, the mounting substrate 11 is stably pressed against the inner wall 23 of the bottom mold housing portion 21.
- the LED 12 does not have to be pressed by, for example, the side surface 41S of the light guide plate 41 in order to make the LED module MJ immobile. Therefore, the freedom degree of arrangement
- the pressing piece PP presses the mounting surface 11a of the mounting substrate 11, the non-mounting surface 11b, which is the back surface of the mounting surface 11a, is in close contact with the adhesive BD efficiently, and as a result, the inner wall of the bottom housing portion 21. 23.
- the flexible pressing piece PP can stably hold the mounting substrate 11 against the inner wall 23 by its own elastic force.
- the mounting substrate 11 is immovable by engaging with the bottom housing 21.
- the protrusion PN is formed on the edge of the mounting substrate 11 facing the inner side surface 23N of the inner wall 23 in the bottom mold housing portion 21 (particularly, the edge facing the bottom portion 22 of the bottom mold housing portion 21). Then, an opening HL into which the protrusion PN fits may be formed in the bottom portion 22 of the bottom housing portion 21 facing the protrusion PN.
- the protrusion (first fitting portion) PN of the mounting substrate 11 and the opening (second fitting portion) HL of the bottom portion 22 of the bottom mold housing portion 21 are fitted to each other, and the mounting substrate 11 is It becomes difficult to warp. As a result, the mounting substrate 11 is unlikely to be separated from the inner wall 23 of the bottom housing 21.
- the pressing piece PP of the top housing portion 25 presses the mounting substrate 11 against the bottom housing portion 21 (specifically, the inner wall 23), and the protrusion PN of the mounting substrate 11 causes the bottom portion 22 of the bottom housing portion 21.
- the mounting substrate 11 is less likely to warp and is less likely to separate from the inner wall 23 of the bottom housing 21.
- the heat applied to the LED 12 and further the heat applied to the mounting substrate 11 are surely escaped through the adhesive BD and the inner wall 23.
- the example in which the mounting substrate 11 is fixed by engaging with the bottom housing 21 is not limited to FIG. 3 and may be as shown in FIG. 4. That is, the bottom housing portion 21 may include a groove DH that sandwiches the edge of the mounting substrate 11 of the LED module MJ (for example, the longitudinal edge of the mounting substrate 11).
- one of the longitudinal sides of the mounting substrate 11 is engaged with the top housing portion 25 and the other longitudinal portion is engaged with the bottom housing portion 21, so that the mounting substrate 11 is less likely to warp, It becomes difficult to separate from the inner wall 23 of the mold housing part 21.
- the space SP surrounded by the pressing piece PP, the bridge plate 27, and the outer wall 26 in the top housing 25. is preferably a space that spreads away from the bridge plate 27. More specifically, as shown in FIG. 5B, the interval W from the pressing piece PP to the outer wall 26 is preferably increased as the distance from the bridge plate 27 increases.
- the distance W between the root PPr of the pressing piece PP and the outer wall 26 is slightly shorter than the total length of the inner wall 23 of the bottom housing 21, the thickness of the adhesive BD, and the thickness of the mounting substrate 11. If so, the interval W between the tip PPe of the pressing piece PP and the outer wall 26 becomes longer than the combined length. As a result, the inner wall 23 of the bottom housing 21, the adhesive BD, and the mounting substrate 11 of the LED module MJ are easily accommodated in the gap W between the pressing piece PP and the outer wall 26.
- the space SP as described above is formed, for example, as the pressing piece PP tapers toward the tip PPe as shown in FIGS. 5A and 5B. More specifically, when one surface of the pressing piece PP facing the inner side surface 26N of the outer wall 26 is inclined so as to be separated from the inner side surface 26N as it advances toward the tip PPe, the above space SP is formed.
- a hemispherical potch PPt may be formed on one surface facing the outer wall 26 by the pressing piece PP.
- the potch PPt contacts the mounting substrate 11 smoothly and does not damage the mounting substrate 11.
- the distance between the pressing piece PP and the outer wall 26 is slightly narrowed, thereby increasing the force with which the pressing piece PP presses the mounting substrate 11 against the inner wall 23. Therefore, the mounting substrate 11 becomes more difficult to separate from the inner wall 23 of the bottom housing portion 21.
- the positions in the substrate surface of the mounting substrate 11 pressed by the pressing piece PP are in the middle and both ends in the longitudinal direction of the mounting substrate 11 as shown in FIG. 1, FIG. 3, and FIG.
- the pressing piece PP presses three points in the board surface of the mounting board 11, the mounting board 11 is efficiently pressed (in short, the entire length of the mounting board 11 is pressed evenly. ). As a result, the warpage of the mounting substrate 11 is efficiently prevented.
- the protrusion PN and the opening HL are formed on the bottom 22 of the mounting substrate 11 and the bottom mold housing portion 21 corresponding to the in-plane position of the mounting substrate 11 pressed by the pressing piece PP.
- the pressing piece PP and the fitting portion are preferably arranged.
- both the lengths of the mounting substrate 11 are efficiently pressed against the inner wall 23 of the bottom housing 21. For this reason, the mounting substrate 11 becomes more difficult to be separated from the inner wall 23.
- the arrangement of the pressing piece PP and the fitting portion is not limited to this, and for example, one end of the mounting substrate 11 between the protrusion PN and the protrusion PN is pressed.
- the pressing piece PP may be positioned.
- the pressing piece PP has been used in order to make the mounting substrate 11 adhere to the inner wall 23 of the bottom housing 21, the pressing piece PP has been used. However, there may be a case where the pressing piece PP is not necessary.
- a protrusion PN is formed on the edge of the mounting substrate 11 facing the top housing portion 25, and an opening HL into which the protrusion PN fits is formed in the bridge plate 27 of the top housing portion 25. It is a case where it is formed.
- one of the longitudinal lengths of the mounting substrate 11 is related to the top housing portion 25 and the other length is related to the bottom housing portion 21. Therefore, the mounting substrate 11 is less likely to warp and is less likely to separate from the inner wall 23 of the bottom housing 21. As a result, the heat applied to the LED 12 and further the heat applied to the mounting substrate 11 are surely escaped through the adhesive BD and the inner wall 23.
- the adhesive material BD is interposed between the non-mounting surface 11b of the mounting substrate 11 and the bottom housing portion 21, but this is not essential.
- the adhesive BD is interposed between the non-mounting surface 11 b of the mounting substrate 11 and the bottom mold housing portion 21, the mounting substrate 11 becomes more difficult to separate from the bottom mold housing portion 21.
- the adhesive BD be formed of a material having high thermal conductivity because heat can be radiated more efficiently.
- the protrusion PN is formed on the mounting substrate 11 and the opening HL is formed on the housing HG (the bottom housing portion 21 and the top housing portion 25), but is not limited thereto.
- the protrusion PN may be formed in the housing HG (the bottom housing portion 21 and the top housing portion 25), and the opening HL may be formed in the mounting substrate 11.
- the engagement between the mounting substrate 11 and the housing portion HG is not limited to the engagement between the protrusion PN and the opening HL. In short, other types of fitting portions may be used.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
- Liquid Crystal (AREA)
Abstract
Description
11 実装基板
11a 実装面
11b 非実装面
PN 突起(第1嵌合部)
12 LED(発光素子)
BD 接着剤
HG ハウジング
21 底型ハウジング部(一方のハウジング部、放熱部)
22 底部
HL 開孔(第2嵌合部)
23 内壁
25 天型ハウジング部(他方のハウジング部)
PP 押さえ片
PPr 押さえ片の根元
PPe 押さえ片の先端
PPt ポッチ
26 外壁
27 架橋板
28 通過口
41 導光板
42 反射シート
43 拡散シート
44 光学シート
45 光学シート
49 バックライトユニット
59 液晶表示パネル
69 液晶表示装置
実施の一形態について、図面に基づいて説明すれば、以下の通りである。なお、便宜上、ハッチングや部材符号等を省略する場合もあるが、かかる場合、他の図面を参照するものとする。また、図面上での黒丸は紙面に対し垂直方向を意味する。
なお、本発明は上記の実施の形態に限定されず、本発明の趣旨を逸脱しない範囲で、種々の変更が可能である。
Claims (10)
- 発光素子と、
上記発光素子を実装する実装基板と、
上記発光素子からの光を受けるとともに、その光を透過させて外部に導く導光板と、
上記発光素子、上記実装基板、および上記導光板を収容するハウジングと、
を含むバックライトユニットにあって、
上記ハウジングは、上記導光板を挟み込むために分かれたハウジング部を含んでおり、
上記の一方のハウジング部は、上記発光素子の駆動で、その発光素子および上記実装基板に帯びる熱を逃す放熱部になり、
上記の他方のハウジング部には、可撓性の押さえ片が形成されており、その押さえ片が、上記実装基板を上記の一方のハウジング部に対して押しつけるバックライトユニット。 - 上記押さえ片が、上記実装基板の実装面に接することで、上記実装基板を上記の一方のハウジング部に対して押しつける請求項1に記載のバックライトユニット。
- 上記押さえ片は、絶縁材で形成される請求項2に記載のバックライトユニット。
- 上記押さえ片にて押さえられる上記実装基板での基板面内位置が、その実装基板の長手方向における中間および両端である請求項1項に記載のバックライトユニット。
- 上記実装基板における長手の一方と上記押さえ片とが係り合うとともに、上記実装基板における長手の他方と上記の一方のハウジング部とが係り合う請求項1に記載のバックライトユニット。
- 互いに嵌り合う第1嵌合部および第2嵌合部のうち、一方の嵌合部が上記実装基板に形成され、他方の嵌合部が上記の一方のハウジング部に形成される請求項5に記載のバックライトユニット。
- 上記第1嵌合部は突起であり、上記第2嵌合部は上記突起の嵌る開孔である請求項6に記載のバックライトユニット。
- 上記押さえ片が押さえる上記実装基板の基板面内位置に対応して、上記嵌合部がその実装基板および上記の一方のハウジング部に形成される請求項6に記載のバックライトユニット。
- 上記実装基板の非実装面と、上記の一方のハウジング部との間に接着材が介在する請求項1に記載のバックライトユニット。
- 請求項1~9のいずれか1項に記載のバックライトユニットと、
上記バックライトユニットからの光を受ける液晶表示パネルと、
を含む液晶表示装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US12/812,442 US20100277670A1 (en) | 2008-02-28 | 2008-10-21 | Backlight unit and liquid crystal display device |
EP08872754A EP2233822A4 (en) | 2008-02-28 | 2008-10-21 | BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE |
JP2010500531A JP5073808B2 (ja) | 2008-02-28 | 2008-10-21 | バックライトユニットおよび液晶表示装置 |
CN2008801257468A CN101932871A (zh) | 2008-02-28 | 2008-10-21 | 背光单元和液晶显示装置 |
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JP2008047361 | 2008-02-28 | ||
JP2008-047361 | 2008-02-28 |
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WO2009107275A1 true WO2009107275A1 (ja) | 2009-09-03 |
Family
ID=41015684
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PCT/JP2008/069001 WO2009107275A1 (ja) | 2008-02-28 | 2008-10-21 | バックライトユニットおよび液晶表示装置 |
Country Status (5)
Country | Link |
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US (1) | US20100277670A1 (ja) |
EP (1) | EP2233822A4 (ja) |
JP (1) | JP5073808B2 (ja) |
CN (1) | CN101932871A (ja) |
WO (1) | WO2009107275A1 (ja) |
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Also Published As
Publication number | Publication date |
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US20100277670A1 (en) | 2010-11-04 |
JP5073808B2 (ja) | 2012-11-14 |
JPWO2009107275A1 (ja) | 2011-06-30 |
CN101932871A (zh) | 2010-12-29 |
EP2233822A1 (en) | 2010-09-29 |
EP2233822A4 (en) | 2013-01-30 |
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