WO2012077562A1 - Illumination device, display device and television receiving device - Google Patents

Illumination device, display device and television receiving device Download PDF

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Publication number
WO2012077562A1
WO2012077562A1 PCT/JP2011/077766 JP2011077766W WO2012077562A1 WO 2012077562 A1 WO2012077562 A1 WO 2012077562A1 JP 2011077766 W JP2011077766 W JP 2011077766W WO 2012077562 A1 WO2012077562 A1 WO 2012077562A1
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WO
WIPO (PCT)
Prior art keywords
guide plate
light guide
plate
light
light source
Prior art date
Application number
PCT/JP2011/077766
Other languages
French (fr)
Japanese (ja)
Inventor
良武 石元
Original Assignee
シャープ株式会社
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 シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2012077562A1 publication Critical patent/WO2012077562A1/en

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light 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
    • G02B6/0081Mechanical 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
    • G02B6/0086Positioning aspects
    • G02B6/0091Positioning aspects of the light source relative to the light guide
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133602Direct backlight
    • G02F1/133608Direct backlight including particular frames or supporting means
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light 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
    • G02B6/0081Mechanical 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
    • G02B6/0085Means for removing heat created by the light source from the package
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light 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
    • G02B6/0081Mechanical 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
    • G02B6/0086Positioning aspects
    • G02B6/0088Positioning aspects of the light guide or other optical sheets in the package

Definitions

  • the present invention relates to a lighting device, a display device, and a television receiver.
  • liquid crystal panels have been widely used as display units for televisions, mobile phones, portable information terminals and the like. Since this type of liquid crystal panel cannot emit light by itself, it uses the light of a separately prepared illumination device (so-called backlight) to display an image.
  • This type of lighting device is arranged on the back side of the liquid crystal panel, and is configured to irradiate light spread in a plane toward the back side of the liquid crystal panel.
  • This type of lighting device is generally known as a side light type (or edge light type), and includes, for example, an LED substrate on which a plurality of LEDs are mounted as a light source unit.
  • the light source unit emits light
  • light is emitted toward the end face of the light guide plate.
  • the irradiated light enters from the end face of the light guide plate and travels inside the light guide plate while being reflected by a reflection sheet or the like laid on the lower side of the light guide plate, and then from the surface (plate surface) to the surface. It is emitted as a light beam.
  • LED substrates as light source units are arranged at intervals so as not to contact each LED with respect to an end surface of a light guide plate. Since this type of light guide plate is made of acrylic resin or the like, the light guide plate expands by receiving heat from the surroundings when the lighting device is turned on. Therefore, as described above, a space is provided in advance between each LED and the end face of the light guide plate so that the thermally expanded light guide plate does not contact and destroy each LED.
  • Patent Document 2 discloses a lighting device in which a strip-shaped (long-shaped) LED substrate is fixed to a back surface at an end portion of a light guide plate via a double-sided tape.
  • the LED board in this lighting device is fixed so that the front side on which a plurality of LEDs are mounted faces upward and the back side faces the floor surface on which the light guide plate is placed.
  • each LED on the LED substrate is arranged at a distance from the end face of the light guide plate.
  • the present invention has been completed based on the above circumstances, and can suppress contact between the light source unit and the thermally expanded light guide plate, and can set a narrow interval between the light source unit and the end face of the light guide plate.
  • An object of the present invention is to provide a lighting device or the like that can perform the above-described operation.
  • An illuminating device includes a light source unit including a light source, a light guide plate disposed so that an end surface thereof is opposed to the light source unit with a space therebetween, a back surface side of the light guide plate, and the light source
  • a base plate comprising the same material as the light guide plate, a floor facing the plate surface of the base plate, and a base plate standing on the floor, the base plate and the light guide plate
  • a chassis having a support portion that supports the first and second support portions.
  • the attachment portion is located at an end portion located on the outer side in plan view than the light guide plate.
  • the base plate is longer than the light guide plate.
  • the light guide plate and the base plate are both made of acrylic resin.
  • the light source unit includes a light emitting substrate on which a plurality of light emitting elements are mounted, and the light emitting substrate is attached to the base plate.
  • a reflection sheet is interposed between the light guide plate and the base plate.
  • the display device includes the illumination device and a display panel that performs display using light from the illumination device.
  • the display panel is, for example, a liquid crystal panel in which liquid crystal is sealed between a pair of substrates.
  • a television receiver according to the present invention includes the display device.
  • the illuminating device which can suppress the contact with a light source unit and the thermally expanded light-guide plate and can set the space
  • FIG. 1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention.
  • 1 is an exploded perspective view showing a schematic configuration of a liquid crystal display device included in the television receiver of FIG. Partial sectional view of liquid crystal display device in short side direction
  • the top view which shows the arrangement
  • the top view which shows the arrangement
  • FIG. The top view which shows the arrangement
  • Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 6.
  • the lighting device 12, the liquid crystal display device 10 including the lighting device 12, and the television receiver TV including the liquid crystal display device 10 are illustrated.
  • Each drawing shows an X axis, a Y axis, and a Z axis.
  • Each axial direction is common between the drawings.
  • the upper side shown by FIG.2 and FIG.3 be a front side, and let the lower side of these figures be a back side.
  • FIG. 1 is an exploded perspective view showing a schematic configuration of the television receiver TV according to the first embodiment.
  • the television receiver TV of the present embodiment mainly includes a liquid crystal display device (display device) 10, front and back cabinets Ca and Cb that are stored so as to sandwich the liquid crystal display device 10, and a power source P. And a tuner T and a stand S.
  • the television liquid crystal display device 10 is supported by the stand S so that the display surface 10a is along the vertical direction (Y-axis direction).
  • FIG. 2 is an exploded perspective view showing a schematic configuration of the liquid crystal display device 10 included in the television receiver TV of FIG.
  • FIG. 3 is a partial cross-sectional view of the liquid crystal display device 10 in the short side direction.
  • the liquid crystal display device 10 has a horizontally long rectangular shape when viewed from the front side, and includes a liquid crystal panel (display panel) 11 and a back side (back side) of the liquid crystal panel 11. And a frame-shaped bezel 13 that covers the front side (display surface side) of the liquid crystal panel 11. These are integrally held by the bezel 13 or the like.
  • the bezel 13 is made of a metal material or the like.
  • the liquid crystal panel 11 has a horizontally long rectangular shape when viewed from the front side.
  • the liquid crystal panel 11 mainly includes a pair of transparent glass substrates facing each other and a liquid crystal layer sealed between these substrates.
  • one glass substrate disposed on the back side (back side) is a so-called thin film transistor (hereinafter, TFT) array substrate
  • the other glass substrate disposed on the display surface side (front side) is This is a so-called color filter (hereinafter referred to as CF) substrate.
  • TFT thin film transistor
  • CF color filter
  • the TFT array substrate is mainly composed of a plurality of TFTs as switching elements and a plurality of transparent pixel electrodes connected to the drain electrodes of each TFT in a matrix (matrix) on a transparent glass plate. It consists of what is provided. Individual TFTs and pixel electrodes are provided for each pixel, and are partitioned by a plurality of gate wirings and a plurality of source wirings provided on the glass plate so as to cross each other. . Note that a gate electrode in each TFT is connected to the gate wiring, and a source electrode is connected to the source wiring.
  • the CF substrate is mainly formed on a transparent glass plate so that the CF composed of each color such as red (R), green (G), and blue (B) corresponds to each pixel of the TFT array substrate. It consists of what was provided in matrix form. Each CF is partitioned by a light-shielding black matrix (BM) provided in a lattice pattern on the glass plate. A transparent counter electrode or the like facing the pixel electrode of the TFT array substrate is provided on the CF and BM.
  • BM light-shielding black matrix
  • the liquid crystal panel 11 is configured such that image data and various control signals necessary for displaying an image from a drive circuit board (not shown) are supplied to the above-described source wiring, gate wiring, counter electrode, and the like. In other words, it is driven by a so-called active matrix method.
  • the liquid crystal panel 11 is provided with polarizing plates (not shown) on the display surface side and the back surface side so as to sandwich the pair of glass substrates.
  • the illumination device 12 is a so-called edge light type (side light type) backlight. As shown in FIGS. 2 and 3, the illumination device 12 mainly includes a chassis 14, an optical member 15, a frame 16, and a light source unit 17. A light guide plate 18, a reflection sheet 19, and an underlay plate 20.
  • the chassis 14 is formed of a shallow box having an upper opening, and is manufactured by pressing a plate material made of a metal material such as an aluminum-based material.
  • the chassis 14 When viewed from the front side, the chassis 14 has a rectangular floor 14a that is long horizontally, a pair of walls 14b and 14c that are erected on the edge of the long side of the floor 14a, and a short side And a pair of walls 14d and 14e facing each other.
  • the bezel 13 and the frame 16 are screwed to the walls 14c, 14b, 14c, 14d of the chassis 14.
  • a columnar support portion 40 for supporting the light guide plate 18 and the like is erected on the floor 14a near the wall 14c.
  • the support portion 40 is made of the same material as the bottom 14a and the like, and the light guide plate 18 and the like are positioned on the floor 14a by the support portion 40.
  • the underlay board 20 is a horizontally long rectangular shape when viewed from the front side, and is made of a plate-like member having a predetermined thickness.
  • the underlay plate 20 is made of the same material as that of the light guide plate 18, and includes, for example, an acrylic resin such as polymethyl methacrylate resin (PMMA), a methyl methacrylate-styrene copolymer resin (MS resin), a polystyrene resin (PS resin), and a polycarbonate resin. (PC resin).
  • PMMA polymethyl methacrylate resin
  • MS resin methyl methacrylate-styrene copolymer resin
  • PS resin polystyrene resin
  • PC resin polycarbonate resin
  • the underlay board 20 is accommodated in the chassis 14 and laid on the floor 14a.
  • a concave portion (not shown) in which the support portion 40 on the floor 14 a is fitted is provided at one end portion on the long side of the underlay plate 20.
  • the concave portion is provided at the center of the end portion, and is formed by cutting a part of the base plate 20 into a predetermined shape so as to penetrate in the thickness direction.
  • the underlay plate 20 is positioned in the chassis 14 using this recess. Predetermined gaps (intervals) are provided between the end surfaces of the underlay plate 20 and the walls 14c, 14b, 14c, and 14d of the chassis 14, respectively.
  • the gaps are provided in advance so that the end faces do not collide with the walls 14c, 14b, 14c, and 14d even when the underlay plate 20 is thermally expanded.
  • the front surface (front surface plate surface) and the back surface (back surface plate surface) of the underlay plate 20 are both flat.
  • the reflection sheet 19 has a horizontally long rectangular shape when viewed from the front side, and is formed of a white foamed plastic sheet (for example, a foamed polyethylene terephthalate sheet).
  • the reflection sheet 19 is placed on the front surface (surface 20a) of the base plate 20 laid on the floor 14a.
  • the size of the reflection sheet 19 is set to be slightly smaller than the base plate 20.
  • a concave portion (not shown) in which the support portion 40 is fitted is also provided at one end portion on the long side of the reflection sheet 19.
  • the recess is provided at the center of the end, and a part of the reflection sheet 19 is cut out into a predetermined shape.
  • the reflection sheet 19 is positioned in the chassis 14 using this recess.
  • the light guide plate 18 is a horizontally long rectangular shape when viewed from the front side and is made of a plate-like member having a predetermined thickness.
  • the light guide plate 1 of the present embodiment is thicker than the underlay plate 20.
  • the light guide plate 18 is made of a highly transparent material.
  • an acrylic resin such as polymethyl methacrylate resin (PMMA), methyl methacrylate-styrene copolymer resin (MS resin), polystyrene resin (PS resin), polycarbonate resin (PC). Resin).
  • the light guide plate 18 is placed on the front side of the underlay plate 20 via a reflection sheet 19. That is, the light guide plate 18 is accommodated in the chassis 14 so that the back surface 181a of the light guide plate 18 faces the front surface 20a of the base plate 20 with the reflection sheet 19 therebetween.
  • the light guide plate 18 is provided with a recess (not shown) into which the support portion 40 is fitted at one end on the long side.
  • the concave portion is provided at the center of the end portion, and is formed by cutting a part of the light guide plate 18 into a predetermined shape so as to penetrate in the thickness direction.
  • the light guide plate 18 is positioned in the chassis 14 using this recess.
  • a light scattering portion (not shown) is provided on the back surface 181 a of the light guide plate 18.
  • the light scattering portion is configured by a white dot pattern and has a function of scattering and reflecting light.
  • the light scattering portion is formed by printing a paste containing a white pigment such as a metal oxide on the back surface 181a of the light guide plate 18 using a silk screen printer.
  • the light source unit 17 includes an LED substrate (light emitting substrate) 17b on which a plurality of LEDs (Light Emitting Diodes) 17a are mounted in a line.
  • LED substrate light emitting substrate
  • LEDs Light Emitting Diodes
  • the LED 17a is composed of a plurality of LED chips, which are light emitting elements, sealed in a housing with a resin material or the like (so-called LED package), and is configured to emit white light.
  • the LED 17a includes three types of LED chips having different main emission wavelengths. Specifically, each LED chip emits red (R), green (G), and blue (B) in a single color. Is configured to do.
  • each LED chip emits red (R), green (G), and blue (B) in a single color. Is configured to do.
  • R red
  • G green
  • B blue
  • Other configurations of the LED 17a include, for example, an LED chip that emits blue (B) in a single color, a phosphor having a light emission peak in the red (R) region, and a light emission peak in the green (G) region.
  • the LED chip may be covered with a resin mixed with a phosphor (for example, a silicon-based resin). Further, as another configuration, a resin (for example, a silicon-based resin) in which an LED chip that emits blue (B) in a single color is incorporated and a phosphor that emits yellow light such as YAG (yttrium, aluminum, garnet) phosphor is mixed. ), The LED chip may be covered. In the present specification, the LED 17 a itself incorporating the LED chip is also included in the “light emitting element”.
  • the LED substrate 17b is formed on a long base material 170 made of a metal material such as an aluminum-based material, an insulating layer 171 made of a synthetic resin formed on the base material 170, and the insulating layer 171.
  • a wiring pattern (not shown) made of a metal film such as a copper foil and a white insulating film (not shown) formed on the insulating layer 171 so as to cover the wiring pattern are provided.
  • a plurality of the LEDs 17a are mounted on the LED substrate 17b so as to be connected in series with each other by the wiring pattern.
  • the LED 17a has a rectangular parallelepiped appearance and includes a flat light exit surface 70.
  • a plurality of LEDs 17a are mounted on the LED substrate 17b so as to be arranged at equal intervals.
  • the lighting device 12 includes an LED driver (not shown), and current is supplied to each LED 17a on the LED substrate 17b by the LED driver, and each LED 17a is driven by PWM (Pulse Width Modulation) control.
  • the light source unit 17 may be attached with heat radiating means such as a heat radiating plate.
  • the light source unit 17 is attached to an end portion (attachment portion) 21 of the base plate 20 as shown in FIGS.
  • the end portion (attachment portion) 21 is located on the outer side in plan view than the light guide plate 18.
  • the light source unit 17 is housed in the chassis 14 while being attached to the underlay plate 20.
  • the light source unit 17 is arrange
  • the light exit surface 70 of each LED 1 and the end surface 18b of the light guide plate 18 face each other with a predetermined distance (d1) therebetween.
  • the light source unit 17 uses an L-shaped fixing bracket (not shown) or the like so that the LED substrate 17b stands vertically with respect to the plate surface (surface 20a) of the underlay plate 20. Fixed to the end 21.
  • FIG. 4 is a plan view showing the arrangement relationship of the light source unit 17, the light guide plate 18 and the underlay plate 20.
  • the light guide plate 18 is placed on the front surface (surface 20 a) of the base plate 20.
  • the reflection sheet is interposed between the base plate 20 and the light guide plate 18 as described above.
  • the light guide plate 18 and the base plate 20 are both rectangular, but the size of the base plate 20 is set to be slightly larger than that of the light guide plate 18. .
  • the light guide plate 18 and the base plate 20 having such a magnitude relationship are aligned so that the end surfaces 20c and the end surfaces 18c on the long side coincide with each other.
  • the recessed part 182 in which the support part 40 fits in the edge part in the end surface 18c side of the light-guide plate 18 is provided.
  • the length L2 on the short side of the base plate 20 is longer than the length L1 on the short side of the light guide plate 18. Therefore, the end portion 21 on the end surface 20 b side of the underlay plate 20 is disposed on the outer side (outside in plan view) than the end portion on the end surface 18 b side of the light guide plate 18. That is, the end portion 21 of the base plate 20 protrudes from the light guide plate 18 in the short side direction (Y-axis direction).
  • the light source unit 17 is attached to the protruding portion (end portion 21). Each LEDa of the light source unit 17 is set to face the end face 18b of the light guide plate 18.
  • the lengths L1 and L2 are in a state at room temperature (a state before thermal expansion).
  • the length L1 of the light guide plate 18 is the distance from the end surface 18b on the side facing the light source unit 17 to the end surface 18c on the side in contact with the support portion 40, and the length L2 of the underlay plate 20 is attached to the light source unit 17 It is the distance from the end surface 20b on the side to be contacted to the end surface 20c on the side in contact with the support portion 40. Since the light guide plate 18 and the underlay plate 20 are both made of the same material as described above, they have the same thermal expansion coefficient (linear expansion coefficient).
  • both the light guide plate 18 and the underlay plate 20 are thermally expanded, the light guide plate 18 and the underlay plate 20 extend toward the outside (the wall 14b side of the chassis 14) with the end portion on the side in contact with the support portion 40 as a base point (starting point). That is, the light guide plate 18 and the base plate 20 are thermally expanded in the same direction, and the respective end portions move in the same direction. Even when the temperature decreases and contracts to the original size, the end portions of the light guide plate 18 and the underlay plate 20 move together.
  • the optical member 15 has a horizontally long rectangular shape when viewed from the front side, like the liquid crystal panel 11 and the like.
  • the optical member 15 includes a diffusion sheet 15a, a lens sheet 15b, and a reflective polarizing sheet 15c. It consists of a laminate.
  • the optical member 15 is disposed on the front side so as to cover the surface 18 a of the light guide plate 18.
  • the diffusion sheet 15a, the lens sheet 15b, and the reflective polarizing sheet 15c are laminated on the surface 18a of the light guide plate 18 in this order.
  • the diffusion sheet 15a is formed, for example, by bonding a diffusion layer in which light scattering particles are dispersed and bonded to the surface of a transparent base made of synthetic resin.
  • the diffusion sheet 15 a has a function of diffusing light emitted from the surface 18 a of the light guide plate 18.
  • the lens sheet 15b has a function of adjusting the traveling direction of light that has passed through the diffusion sheet 15a, for example, from a surface of a synthetic resin-made translucent base material on which a convex lens is formed.
  • the reflective polarizing sheet 15c has a function of reflecting linearly polarized light having a vibration plane orthogonal to the transmission polarization axis, and is made of, for example, a trade name DBEF (Dual Brightness Enhancement Film) manufactured by Sumitomo 3M Limited. As shown in FIGS. 2 and 3, the liquid crystal panel 11 is disposed above the optical member 15.
  • DBEF Dual Brightness Enhancement Film
  • the frame 16 has a frame shape (frame shape) along the periphery of the liquid crystal panel 11 and the light guide plate 18 and is made of synthetic resin.
  • the frame 16 is black and has a light shielding property.
  • the frame 16 covers the chassis 14 containing the light guide plate 18 and the optical member 15 from the upper side.
  • the inner peripheral edge of the frame 16 is placed on the peripheral end (periphery) of the light guide plate 18 via the optical member 15.
  • the frame 16 is fixed to each wall 14b, 14c, 14d, 14e of the chassis 14 with screws or the like.
  • the liquid crystal panel 11 is placed on the frame 16 so that the inner peripheral edge of the frame 16 can support the outer peripheral edge of the liquid crystal panel 11.
  • the outer peripheral edge of the liquid crystal panel 11 is fixed by being sandwiched between the frame 16 and the above-described frame-shaped bezel 13 covered from above the frame 16.
  • the bezel 13 is fixed to the walls 14b, 14c, 14d, and 14e of the chassis 14 together with the frame 16 and the like by screws or the like.
  • the light source unit 17 of the illumination device 12 emits light.
  • the light source unit 17 emits light (that is, when each LED 17a emits light)
  • light enters the inside from the end face 18b of the light guide plate 18.
  • the incident light is reflected by a reflection sheet 19 laid on the back side of the light guide plate 18, a light scattering portion (not shown) formed on the back surface 181 a of the light guide plate, etc., and proceeds in the light guide plate 18.
  • the emitted light passes through the optical member 15 and becomes light spread in a planar shape, and illuminates the back surface of the liquid crystal panel 11.
  • the liquid crystal panel 11 displays an image on the surface (display surface 10a) using the light from the illumination device 12.
  • FIG. 5 is a plan view showing the positional relationship between the light guide plate 18 and the base plate 20 before thermal expansion
  • FIG. 6 is a plan view showing the positional relationship between the light guide plate 18 and the base plate 20 after thermal expansion.
  • the arrangement relationship between the light guide plate 18 and the base plate 20 before and after thermal expansion will be described mainly with reference to FIGS. 5 and 6.
  • FIG. 5 schematically shows a part of the light guide plate 18 and the base plate 20 shown in FIG.
  • a gap d ⁇ b> 1 is provided between the end surface 18 b of the light guide plate 18 before thermal expansion and each LED 17 a (light output surface 70) of the light source unit 17.
  • the lighting device 12 is turned on and generates heat
  • the light guide plate 18 and the underlay plate 20 are both heated and thermally expanded.
  • the light guide plate 18 and the base plate 20 are thermally expanded, they extend not only in the short side direction (Y-axis direction) but also in the long side direction (X-axis direction). However, here, only thermal expansion in the short side direction (Y-axis direction) of the light guide plate 18 and the underlay plate 20 will be described.
  • the end surface 18c of the light guide plate 18 and the end surface 20c of the underlay plate 20 are aligned with each other (see FIG. 4).
  • the end portion on the end surface 18 c side of the light guide plate 18 and the end portion on the end surface 20 c side of the underlay plate 20 are both positioned by the support portion 40.
  • the light guide plate 18 thus positioned is thermally expanded, the light guide plate 18 extends in a direction away from the support portion 40.
  • the length on the short side (short side direction) of the light guide plate 18 is increased by x1.
  • the base plate 20 when the base plate 20 is thermally expanded, the base plate 20 extends in a direction away from the support portion 40 as in the light guide plate 18.
  • the light guide plate 18 and the underlay plate 20 both thermally expand in the same direction.
  • the length on the short side (short side direction) of the base plate 20 is assumed to increase by x2. Note that when the base plate 20 is thermally expanded, the light source unit 17 disposed on the end portion (attachment portion) 21 also moves in a direction away from the support portion 40 together with the base plate 20.
  • the length L1 on the short side of the light guide plate 18 before thermal expansion is set to be shorter than the length L2 on the short side of the underlay plate 20.
  • the thermal expansion coefficient (linear expansion coefficient) ⁇ ⁇ b> 1 in the short side direction of the light guide plate 18 and the thermal expansion coefficient in the short side direction of the base plate 20. (Linear expansion coefficient) ⁇ 2 is equal. Therefore, when both the light guide plate 18 and the base plate 20 whose temperature before thermal expansion is normal temperature (room temperature) are heated and the temperature rises by t1, their elongation (increase) is increased before thermal expansion (at normal temperature). ) (The length on the short side).
  • the extension x1 of the light guide plate 18 is also set. , It becomes shorter (smaller) than the extension x2 of the underlay plate 20.
  • a gap d1 is provided between the end face 18b of the light guide plate 18 before thermal expansion and each LED 17a (light exit surface 70) of the light source unit 17, as shown in FIG. Further, as shown in FIG. 6, the distance d ⁇ b> 2 is also maintained between the end surface 18 b of the light guide plate 18 after thermal expansion and each LED 17 a (light output surface 70) of the light source unit 17. That is, in the lighting device 12 of the present embodiment, even when the light guide plate 18 is thermally expanded, the end surface 18 b is suppressed from contacting the light source unit 17. The principle will be described below.
  • the end surface 18c moves so as to approach the light source unit 17 attached on the end portion 21 of the underlay plate 20. Further, as the light guide plate 18 is thermally expanded, the underlay plate 20 is also thermally expanded, so that the light source unit 17 is moved away from the light guide plate 18. As described above, the extension x1 on the short side of the light guide plate 18 is shorter (smaller) than the extension x2 on the short side of the underlay plate 20. In other words, since the moving distance of the light guide plate 18 at the time of thermal expansion is shorter than the moving distance of the light source unit 17, the thermally expanded light guide plate 18 does not catch up with the light source unit 17.
  • the distance d1 set before the thermal expansion is maintained between the end surface 18b of the light guide plate 18 and the light source unit 17 (the light exit surface 70 of each LED 17a). In this way, even if the light guide plate 18 is thermally expanded, the end surface 18c is prevented from coming into contact with the light source unit 17.
  • the illuminating device 12 of the present embodiment even when the light guide plate 18 is thermally expanded, the contact between the end surface 18b and the light source unit 17 is suppressed. And the illuminating device 12 of this embodiment can raise the incident efficiency (introduction efficiency) of the light with respect to the light-guide plate 18 substantially. This is because the distance d1 between the end face 18b of the light guide plate 18 and the light source unit 17 can be set as narrow as possible in the configuration of the illumination device 12 in the present embodiment. Even if the interval d1 is set narrow, as described above, the light guide plate 18 does not come into contact with the light source unit 17 even if it thermally expands, so that the light source unit 17 can be prevented from being damaged.
  • the reflective sheet 19 interposed between the light guide plate 18 and the base plate 20 is provided. Reliability is also improved. Since the reflection sheet 19 is thinner than the light guide plate 18 and the like, it is easy to bend and wrinkle more easily. However, in the present embodiment, the reflection sheet 19 is sandwiched between the back plate surface (back surface 181a) of the light guide plate 18 and the front plate surface (surface 20a) of the underlay plate 20. Therefore, the occurrence of bending and wrinkles is prevented. Therefore, the performance of the reflection sheet 19 is ensured by the base plate 20 disposed on the back side of the light guide plate 18. Moreover, the use efficiency of the light in the illuminating device 12 also improves by improving the reliability of the reflective sheet 19.
  • the reflection sheet 19 and the light guide plate 18 are protected by the underlay plate 20 from wear, damage, and the like due to contact with the bottom 14a of the chassis 14 and the like.
  • the chassis 14 is generally harder than the light guide plate 18 and the like because it is formed by processing a plate material made of a metal material. Therefore, if irregularities are formed on the floor 14 a of the chassis 14, the portion may be caught by the light guide plate 18 and the reflection sheet 19, and may be damaged.
  • the underlay plate 20 is laid on the floor 14a as in this embodiment, the light guide plate 18 and the reflection sheet 19 are protected by the underlay plate 20, and are damaged by contact with the floor 14a and the like. Is suppressed.
  • the base plate 20 is disposed on the floor 14a of the chassis 14, whereby the rigidity of the entire lighting device 12 is also improved.
  • FIG. 7 is a plan view showing the positional relationship between the light guide plate 18 and the base plate 20 of the illumination device 12A according to the second embodiment.
  • the chassis and the like included in the illumination device 12A are omitted in FIG.
  • the basic configuration of the illumination device 12A is the same as that of the first embodiment. However, the positioning method of the light guide plate 18 and the underlay plate 20 and the location of the light source unit 17 are different.
  • the underlay plate 20 of this embodiment is also made of the same material as the light guide plate 18 (for example, acrylic resin), as in the first embodiment.
  • the underlay plate 20 is set so that the length on the short side is longer than that of the light guide plate 18. That is, both end portions 21, 21 on the long side of the base plate 20 protrude outward (outside in plan view) from both end portions on the long side of the light guide plate 18.
  • the length of the long side of the base plate 20 and the length of the long side of the light guide plate 18 are set to be the same.
  • the light guide plate 18 is provided with recesses 182 and 182 at both ends on the short side.
  • One recess 182 is provided at the center of the end on the end surface 18d side, and the other recess 182 is provided at the center of the end on the end surface 18e side.
  • Two support portions 40, 40 standing on the bottom of the chassis are fitted in these recesses 182, 182, respectively. That is, the light guide plate 18 is positioned on the floor of the chassis so that both end portions on the short side are sandwiched between the two support portions 40 and 40.
  • the underlay plate 20 is also provided with recesses (not shown) at both ends on its short side.
  • the support portions 40 are fitted in these recesses. That is, the base plate 20 and the light guide plate 18 are positioned on the floor of the chassis by the common support portion 40.
  • a reflective sheet is interposed between the underlay plate 20 and the light guide plate 18, the reflective sheet is omitted in FIG. 7 for convenience of explanation. This reflection sheet is also positioned by the support portions 40 and 40.
  • the illuminating device 12 ⁇ / b> A of the present embodiment is arranged such that the light source units 17 and 17 face the two end surfaces 18 b and 18 c on the long side of the light guide plate 18, respectively. .
  • Each light source unit 17, 17 is fixed to both ends (attachment portions) 21, 21 on the long side of the underlay plate 20.
  • a predetermined interval is provided between each end face 18 b, 18 c of the light guide plate 18 and each light source unit 17, 17.
  • the respective end surfaces 18 b and 18 c move so as to approach the respective light source units 17 and 17.
  • the end portion on the end surface 18 b side of the light guide plate 18 extends in a direction away from the support portion 40, and the end portion on the end surface 18 c side of the light guide plate 18 also extends in a direction away from the support portion 40. Therefore, when the light guide plate 18 is thermally expanded, both end portions on the long side are moved away from each other. Similarly to the light guide plate 18, the underlay plate 20 also moves so that both ends on the long side are separated from each other when thermally expanded.
  • the distance (increase in the underlaying plate) that the underlay plate 20 is moved in thermal expansion than the distance in which the light guide plate 18 moves due to thermal expansion (increase in the amount of light guide plate). Since the length is longer, the contact between each end face 18b, 18c of the light guide plate 18 and each light source unit 17 is suppressed by the same principle as in the first embodiment. Also in the present embodiment, the portion that is in contact with the support portion 40 serves as a base point (starting point), and the light guide plate 18 and the base plate 20 are configured to thermally expand in the same direction and extend.
  • FIG. 8 is an explanatory diagram showing the positional relationship between the light guide plate 18 and the base plate 20 of the lighting device 12B according to the third embodiment.
  • This illuminating device 12B is obtained by removing the light source unit 17 arranged on the end face 18c side of the light guide plate 18 from the illuminating device 12A shown in FIG.
  • the light source unit 17 is arrange
  • the positioning methods (locations) of the light guide plate 18 and the base plate 20 by the support portion 40 are different from each other.
  • the portion where the light guide plate 18 and the base plate 20 are in contact with the support portion 40 is the base point (starting point) of thermal expansion, and both the light guide plate 18 and the light source unit 17 are based on the same principle. Contact with is suppressed.
  • FIG. 9 is a cross-sectional view in the short side direction of the liquid crystal display device 10C of the fourth embodiment.
  • the basic configuration of the liquid crystal display device 10C of the present embodiment is the same as that of the first embodiment.
  • the base plate 20 is fixed to the floor 14 a of the chassis 14 with the double-sided tape 30, and the support pins (support portions) 40 are fixed to the base plate 20. What is different is different.
  • concave portions 182 are formed at both ends of the light guide plate 18 on the short side.
  • the recess 182 is provided in the center of each end on the short side.
  • the support pin (support part) 40c is inserted.
  • the support pins 40c are inserted into the base plate 20 from the back plate surface to the front plate surface, and are directly fixed to the base plate 20.
  • the support pin 40 c has a threaded portion (not shown) around its root portion and is screwed to the underlay plate 20.
  • the liquid crystal display device 10 ⁇ / b> C of the present embodiment has a preferable configuration when the light guide plate 18 is thermally expanded but the underlay plate 20 is hardly thermally expanded.
  • the light guide plate 18 and the underlay plate 20 are both made of the same material.
  • the base plate 20 may be formed of a material that is less likely to thermally expand than the light guide plate 18.
  • the illuminating device 12 ⁇ / b> C of the present embodiment since the base plate 20 is disposed on the back side of the light guide plate 18, the reliability of the reflection sheet 19 interposed between the light guide plate 18 and the base plate 20 is improved. ing. In the illumination device 12C, the reflection sheet 19 and the light guide plate 18 are protected by the underlay plate 20 from abrasion, damage, and the like due to contact with the bottom 14a of the chassis 14 and the like. In addition, the illuminating device 12 ⁇ / b> C has improved the rigidity of the entire illuminating device 12 ⁇ / b> C by disposing the base plate 20 on the floor 14 a of the chassis 14. In other embodiments, the underlay plate 20 may be fixed on the floor 14a of the chassis 14 with screws (screws) or the like instead of the double-sided tape 30.
  • the light source unit is disposed so as to face one or two of the four end surfaces of the rectangular light guide plate.
  • the light source unit may be arranged so as to face the (remaining) end surface of the light source.
  • an LED substrate on which a plurality of LEDs are mounted is used as the light source unit.
  • a cold cathode fluorescent lamp (CCFL) or the like is used as the light source. May be applied.
  • the reflection sheet is interposed between the light guide plate and the underlay plate.
  • the reflection sheet is removed and the light guide plate is directly attached to the underlay plate. It may be arranged on the front side.
  • the concave portion of the light guide plate in which the support portion is fitted is formed by partially cutting off the end portion of the light guide plate. You may form from the hole which penetrates an optical plate in the thickness direction.
  • the thickness of the light guide plate is set larger (thicker) than the thickness of the underlay plate.
  • the thickness of the light guide plate and the thickness of the underlay plate are set to be the same.
  • the thickness of the base plate may be set larger (thicker) than the thickness of the light guide plate.
  • the present invention can also be applied to a liquid crystal display device using a switching element other than the TFT (for example, a thin film diode).
  • the liquid crystal display device performs color display, but the present invention can also be applied to a liquid crystal display device that performs black and white display.
  • the television receiver provided with the tuner is exemplified, but the present invention is also applicable to a display device not provided with the tuner.
  • SYMBOLS 10 Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12 ... Illuminating device, 13 ... Bezel, 14 ... Chassis, 14a ... Floor, 14b, 14c, 14d, 14d ... Wall, 15 ... Optical member , 16 ... Frame, 17 ... Light source unit, 17a ... LED, 17b ... LED substrate, 18 ... Light guide plate, 19 ... Reflective sheet, 20 ... Underlay plate, 21 ... End (attachment part)

Abstract

The disclosed illumination device (12) is provided with: a light source unit (17) having with a light source; a light guide plate (18) arranged with an end surface (18b) separated from and facing the light source unit (17); an underlying plate (20) arranged on the side of back surface (181a)of the light guide plate (18), provided with an attachment unit (21) to which the light source unit (17) is attached, and configured from the same material as the light guide plate (18); and a chassis (14) having both a floor (14a) facing the a plate surface (20a) of the underlying plate (20), and a support unit (40) which, arranged upright on the floor (14a), supports the underlying plate (20) and the light guide plate (18).

Description

照明装置、表示装置及びテレビ受信装置Lighting device, display device, and television receiver
 本発明は、照明装置、表示装置及びテレビ受信装置に関する。 The present invention relates to a lighting device, a display device, and a television receiver.
 近年、テレビ、携帯電話、携帯情報端末等の表示部として、液晶パネルが汎用されている。この種の液晶パネルは、それ自身で光を発することができないため、画像を表示させるために、別途用意されている照明装置(所謂、バックライト)の光を利用している。この種の照明装置は、液晶パネルの背面側に配置され、そして液晶パネルの背面に向けて面状に拡がった光を照射するように構成されている。 In recent years, liquid crystal panels have been widely used as display units for televisions, mobile phones, portable information terminals and the like. Since this type of liquid crystal panel cannot emit light by itself, it uses the light of a separately prepared illumination device (so-called backlight) to display an image. This type of lighting device is arranged on the back side of the liquid crystal panel, and is configured to irradiate light spread in a plane toward the back side of the liquid crystal panel.
 前記照明装置としては、導光板と、この導光板の端面と対向するように配置される光源ユニットとを備えるものが知られている(例えば、特許文献1参照)。この種の照明装置は、一般的に、サイドライト型(又はエッジライト型)として知られており、光源ユニットとして、例えば、複数個のLEDが実装されたLED基板を備えている。この光源ユニットが発光すると、導光板の端面に向かって光が照射される。そして、照射された光は、導光板の端面から入射し、そして導光板の下側に敷かれている反射シート等によって反射されながら導光板の内部を進み、その後、表面(板面)から面状の光となって出射する。 As the illuminating device, one having a light guide plate and a light source unit disposed so as to face the end face of the light guide plate is known (for example, see Patent Document 1). This type of lighting device is generally known as a side light type (or edge light type), and includes, for example, an LED substrate on which a plurality of LEDs are mounted as a light source unit. When the light source unit emits light, light is emitted toward the end face of the light guide plate. The irradiated light enters from the end face of the light guide plate and travels inside the light guide plate while being reflected by a reflection sheet or the like laid on the lower side of the light guide plate, and then from the surface (plate surface) to the surface. It is emitted as a light beam.
 特許文献1に示されるように、光源ユニットとしてのLED基板は、導光板の端面に対して、各LEDが接触しないように間隔を隔てて配置されている。この種の導光板は、アクリル樹脂等からなるため、照明装置の点灯時に周囲から熱を受けて膨張(熱膨張)する。そのため、熱膨張した導光板が接触して各LEDを破壊しないように、上記のように、各LEDと導光板の端面との間に予め間隔が設けられている。 As shown in Patent Document 1, LED substrates as light source units are arranged at intervals so as not to contact each LED with respect to an end surface of a light guide plate. Since this type of light guide plate is made of acrylic resin or the like, the light guide plate expands by receiving heat from the surroundings when the lighting device is turned on. Therefore, as described above, a space is provided in advance between each LED and the end face of the light guide plate so that the thermally expanded light guide plate does not contact and destroy each LED.
 なお、特許文献2には、帯状(長尺状)のLED基板が、導光板の端部における裏面に、両面テープを介して固定されている照明装置が示されている。この照明装置におけるLED基板は、複数個のLEDが実装されている表側が上を向き、その裏側が導光板を載せる床面を向くように、固定されている。このような照明装置においても、LED基板上の各LEDは、前記導光板の端面に対して間隔を取って配置されている。 Note that Patent Document 2 discloses a lighting device in which a strip-shaped (long-shaped) LED substrate is fixed to a back surface at an end portion of a light guide plate via a double-sided tape. The LED board in this lighting device is fixed so that the front side on which a plurality of LEDs are mounted faces upward and the back side faces the floor surface on which the light guide plate is placed. Also in such an illuminating device, each LED on the LED substrate is arranged at a distance from the end face of the light guide plate.
特開2008-311234号公報JP 2008-311234 A 特開2007-250197号公報JP 2007-250197 A
 導光板に対して光を効率良く入射させる観点からは、光源ユニットと、導光板の端面との間に隙間は形成されないことが好ましい。しかしながら、上述したように導光板は熱膨張するため、光源ユニットと導光板の端面との間には、導光板が伸びる分を考慮した間隔を設ける必要がある。 From the viewpoint of efficiently making light incident on the light guide plate, it is preferable that no gap be formed between the light source unit and the end face of the light guide plate. However, since the light guide plate is thermally expanded as described above, it is necessary to provide an interval in consideration of the extension of the light guide plate between the light source unit and the end surface of the light guide plate.
 近年、液晶パネルの大型化に伴って、照明装置に使用される導光板も大型化している。導光板が大型化すると、熱膨張によって伸びる分が大きくなるため、光源ユニットと導光板の端面との間隔を大きく取らざるを得ず、特に問題となっている。 In recent years, with the increase in size of liquid crystal panels, the size of light guide plates used in lighting devices has also increased. When the size of the light guide plate is increased, the amount of extension due to thermal expansion increases, and thus the gap between the light source unit and the end face of the light guide plate must be increased, which is a particular problem.
(発明が解決しようとする課題)
 本発明は上記のような事情に基づいて完成されたものであって、光源ユニットと熱膨張した導光板との接触を抑制でき、かつ光源ユニットと導光板の端面との間隔を狭く設定することが可能な照明装置等を提供することを目的とする。
(Problems to be solved by the invention)
The present invention has been completed based on the above circumstances, and can suppress contact between the light source unit and the thermally expanded light guide plate, and can set a narrow interval between the light source unit and the end face of the light guide plate. An object of the present invention is to provide a lighting device or the like that can perform the above-described operation.
(課題を解決するための手段)
 本発明に係る照明装置は、光源を備える光源ユニットと、端面が前記光源ユニットと間隔を隔てて対向するように配される導光板と、前記導光板の裏面側に配されるとともに、前記光源ユニットが取り付けられる取付部を備え、前記導光板と同材質にて構成される下敷板と、前記下敷板の板面と対向する床と、前記床に立設され、前記下敷板及び前記導光板を支持する支持部と、を有するシャーシと、を備えることを特徴とする。
(Means for solving problems)
An illuminating device according to the present invention includes a light source unit including a light source, a light guide plate disposed so that an end surface thereof is opposed to the light source unit with a space therebetween, a back surface side of the light guide plate, and the light source A base plate comprising the same material as the light guide plate, a floor facing the plate surface of the base plate, and a base plate standing on the floor, the base plate and the light guide plate And a chassis having a support portion that supports the first and second support portions.
 前記照明装置において、前記取付部が、前記導光板よりも平面視外側に位置する端部にあることが好ましい。 In the illuminating device, it is preferable that the attachment portion is located at an end portion located on the outer side in plan view than the light guide plate.
 前記照明装置において、前記下敷板が、前記導光板よりも長いことが好ましい。 In the lighting device, it is preferable that the base plate is longer than the light guide plate.
 前記照明装置において、例えば、前記導光板と、前記下敷板とが共にアクリル樹脂からなる。 In the lighting device, for example, the light guide plate and the base plate are both made of acrylic resin.
 前記照明装置において、例えば、前記光源ユニットが、複数個の発光素子が実装された発光基板からなり、前記発光基板が前記下敷板に取り付けられている。 In the illuminating device, for example, the light source unit includes a light emitting substrate on which a plurality of light emitting elements are mounted, and the light emitting substrate is attached to the base plate.
 前記照明装置において、前記導光板と前記下敷板との間に反射シートが介在されることが好ましい。 In the illumination device, it is preferable that a reflection sheet is interposed between the light guide plate and the base plate.
 本発明に係る表示装置は、前記照明装置と、前記照明装置からの光を利用して表示を行う表示パネルとを備える。 The display device according to the present invention includes the illumination device and a display panel that performs display using light from the illumination device.
 前記表示装置において、前記表示パネルは、例えば、一対の基板間に液晶を封入してなる液晶パネルからなる。 In the display device, the display panel is, for example, a liquid crystal panel in which liquid crystal is sealed between a pair of substrates.
 本発明に係るテレビ受信装置は、前記表示装置を備える。 A television receiver according to the present invention includes the display device.
(発明の効果)
 本発明によれば、光源ユニットと熱膨張した導光板との接触を抑制でき、かつ光源ユニットと導光板の端面との間隔を狭く設定することが可能な照明装置を提供できる。また、本発明によれば、このような照明装置を備えた表示装置、及びテレビ受信装置を提供できる。
(The invention's effect)
ADVANTAGE OF THE INVENTION According to this invention, the illuminating device which can suppress the contact with a light source unit and the thermally expanded light-guide plate and can set the space | interval of a light source unit and the end surface of a light-guide plate narrowly can be provided. In addition, according to the present invention, it is possible to provide a display device and a television receiver including such an illumination device.
本発明の実施形態1に係るテレビ受信装置の概略構成を示す分解斜視図1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention. 図1のテレビ受信装置が備える液晶表示装置の概略構成を示す分解斜視図1 is an exploded perspective view showing a schematic configuration of a liquid crystal display device included in the television receiver of FIG. 液晶表示装置の短辺方向における部分断面図Partial sectional view of liquid crystal display device in short side direction 光源ユニット、導光板及び下敷板の配置関係を示す平面図The top view which shows the arrangement | positioning relationship of a light source unit, a light-guide plate, and an underlay board 熱膨張前の導光板及び下敷板の配置関係を示す平面図The top view which shows the arrangement | positioning relationship of the light-guide plate and baseplate before thermal expansion 熱膨張後の導光板及び下敷板の配置関係を示す平面図The top view which shows the arrangement | positioning relationship of the light-guide plate after thermal expansion, and an underlay board 実施形態2における照明装置の導光板及び下敷板の配置関係を示す平面図The top view which shows the arrangement | positioning relationship of the light-guide plate and underlay board of the illuminating device in Embodiment 2. FIG. 実施形態3における照明装置の導光板及び下敷板の配置関係を示す平面図The top view which shows the arrangement | positioning relationship of the light-guide plate and underlay board of the illuminating device in Embodiment 3. FIG. 実施形態4の液晶表示装置における短辺方向の断面図Sectional drawing of the short side direction in the liquid crystal display device of Embodiment 4
<実施形態1>
 本発明の実施形態1を、図1ないし図6を参照しつつ説明する。本実施形態では、照明装置12と、この照明装置12を備える液晶表示装置10と、この液晶表示装置10を備えるテレビ受信装置TVについて例示する。なお、各図面にはX軸、Y軸及びZ軸が示されている。各軸方向は、各図面間で共通する。また、図2及び図3に示される上側を表側とし、これらの図の下側を裏側とする。
<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 6. In the present embodiment, the lighting device 12, the liquid crystal display device 10 including the lighting device 12, and the television receiver TV including the liquid crystal display device 10 are illustrated. Each drawing shows an X axis, a Y axis, and a Z axis. Each axial direction is common between the drawings. Moreover, let the upper side shown by FIG.2 and FIG.3 be a front side, and let the lower side of these figures be a back side.
 図1は、実施形態1に係るテレビ受信装置TVの概略構成を示す分解斜視図である。図1に示されるように、本実施形態のテレビ受信装置TVは、主として、液晶表示装置(表示装置)10と、この液晶表示装置10を挟むようにして収納する表裏両キャビネットCa,Cbと、電源Pと、チューナーTと、スタンドSとを備える。テレビ液晶表示装置10は、その表示面10aが鉛直方向(Y軸方向)に沿うように、スタンドSによって支持されている。 FIG. 1 is an exploded perspective view showing a schematic configuration of the television receiver TV according to the first embodiment. As shown in FIG. 1, the television receiver TV of the present embodiment mainly includes a liquid crystal display device (display device) 10, front and back cabinets Ca and Cb that are stored so as to sandwich the liquid crystal display device 10, and a power source P. And a tuner T and a stand S. The television liquid crystal display device 10 is supported by the stand S so that the display surface 10a is along the vertical direction (Y-axis direction).
 図2は、図1のテレビ受信装置TVが備える液晶表示装置10の概略構成を示す分解斜視図である。図3は、液晶表示装置10の短辺方向における部分断面図である。図2に示されるように、液晶表示装置10は、表側から平面視した際に、全体として横長の矩形状であり、液晶パネル(表示パネル)11と、この液晶パネル11の背面側(裏側)に配置される照明装置12と、液晶パネル11の表側(表示面側)から被せられる額縁状のベゼル13とを備える。これらは、前記ベゼル13等によって一体的に保持されている。なお、ベゼル13は金属材料等からなる。 FIG. 2 is an exploded perspective view showing a schematic configuration of the liquid crystal display device 10 included in the television receiver TV of FIG. FIG. 3 is a partial cross-sectional view of the liquid crystal display device 10 in the short side direction. As shown in FIG. 2, the liquid crystal display device 10 has a horizontally long rectangular shape when viewed from the front side, and includes a liquid crystal panel (display panel) 11 and a back side (back side) of the liquid crystal panel 11. And a frame-shaped bezel 13 that covers the front side (display surface side) of the liquid crystal panel 11. These are integrally held by the bezel 13 or the like. The bezel 13 is made of a metal material or the like.
 液晶パネル11は、図2に示されるように、表側から平面視した際に、全体として横長の矩形状をなしている。この液晶パネル11は、主として、互いに向かい合う一対の透明なガラス基板と、これらの基板間に封入される液晶層とを備える。これらの基板のうち、背面側(裏側)に配置される一方のガラス基板は、所謂、薄膜トランジスタ(以下、TFT)アレイ基板であり、表示面側(表側)に配置される他方のガラス基板は、所謂、カラーフィルタ(以下、CF)基板である。 As shown in FIG. 2, the liquid crystal panel 11 has a horizontally long rectangular shape when viewed from the front side. The liquid crystal panel 11 mainly includes a pair of transparent glass substrates facing each other and a liquid crystal layer sealed between these substrates. Among these substrates, one glass substrate disposed on the back side (back side) is a so-called thin film transistor (hereinafter, TFT) array substrate, and the other glass substrate disposed on the display surface side (front side) is This is a so-called color filter (hereinafter referred to as CF) substrate.
 TFTアレイ基板は、主として、透明なガラス製の板上に、スイッチング素子としての複数個のTFTと、各TFTのドレイン電極に接続する透明な複数個の画素電極とがマトリクス状(行列状)に設けられたものからなる。個々のTFT及び画素電極は、画素毎に設けられており、互いに交差するように前記ガラス製の板上に設けられている複数本のゲート配線と、複数本のソース配線とによって区画されている。なお、各TFTにおけるゲート電極は前記ゲート配線と接続し、ソース電極は前記ソース配線と接続している。 The TFT array substrate is mainly composed of a plurality of TFTs as switching elements and a plurality of transparent pixel electrodes connected to the drain electrodes of each TFT in a matrix (matrix) on a transparent glass plate. It consists of what is provided. Individual TFTs and pixel electrodes are provided for each pixel, and are partitioned by a plurality of gate wirings and a plurality of source wirings provided on the glass plate so as to cross each other. . Note that a gate electrode in each TFT is connected to the gate wiring, and a source electrode is connected to the source wiring.
 CF基板は、主として、透明なガラス製の板上に、赤色(R)、緑色(G)、青色(B)等の各色からなるCFが、前記TFTアレイ基板の各画素に対応するように、マトリクス状に設けられたものからなる。各CFは、前記ガラス製の板上に格子状に設けられている遮光性のブラックマトリクス(BM)によって区画されている。なお、前記CF及びBM上には、前記TFTアレイ基板の画素電極と向かい合う透明な対向電極等が設けられている。 The CF substrate is mainly formed on a transparent glass plate so that the CF composed of each color such as red (R), green (G), and blue (B) corresponds to each pixel of the TFT array substrate. It consists of what was provided in matrix form. Each CF is partitioned by a light-shielding black matrix (BM) provided in a lattice pattern on the glass plate. A transparent counter electrode or the like facing the pixel electrode of the TFT array substrate is provided on the CF and BM.
 液晶パネル11は、上述したソース配線、ゲート配線及び対向電極等に、駆動回路基板(不図示)から画像を表示するために必要な画像データや各種制御信号が供給されるように構成されており、所謂、アクティブマトリクス方式で駆動する。なお、液晶パネル11には、その表示面側と背面側に、前記一対のガラス基板を挟むようにそれぞれ偏光板(不図示)が設けられている。 The liquid crystal panel 11 is configured such that image data and various control signals necessary for displaying an image from a drive circuit board (not shown) are supplied to the above-described source wiring, gate wiring, counter electrode, and the like. In other words, it is driven by a so-called active matrix method. The liquid crystal panel 11 is provided with polarizing plates (not shown) on the display surface side and the back surface side so as to sandwich the pair of glass substrates.
 照明装置12は、所謂、エッジライト型(サイドライト型)のバックライトであり、図2及び図3に示されるように、主として、シャーシ14と、光学部材15と、フレーム16と、光源ユニット17と、導光板18と、反射シート19と、下敷板20とを備える。 The illumination device 12 is a so-called edge light type (side light type) backlight. As shown in FIGS. 2 and 3, the illumination device 12 mainly includes a chassis 14, an optical member 15, a frame 16, and a light source unit 17. A light guide plate 18, a reflection sheet 19, and an underlay plate 20.
 シャーシ14は、上側が開口した浅底状の箱からなり、アルミニウム系材料等の金属材料からなる板材をプレス加工等して製造される。このシャーシ14は、表側から平面視した際に、横に長い矩形状の床14aと、この床14aの長辺側の縁に立設された互いに向かい合う一対の壁14b,14cと、短辺側の縁に立設された互いに向かい合う一対の壁14d,14eとを備える。なお、シャーシ14の各壁14c,14b,14c,14dに、ベゼル13及びフレーム16がねじ止めされる。また、壁14cの近くの床14a上には、導光板18等を支持するための柱状の支持部40が立設されている。この支持部40は、底14a等と同種の材料からなる、この支持部40によって導光板18等が、床14a上で位置決めされる。 The chassis 14 is formed of a shallow box having an upper opening, and is manufactured by pressing a plate material made of a metal material such as an aluminum-based material. When viewed from the front side, the chassis 14 has a rectangular floor 14a that is long horizontally, a pair of walls 14b and 14c that are erected on the edge of the long side of the floor 14a, and a short side And a pair of walls 14d and 14e facing each other. The bezel 13 and the frame 16 are screwed to the walls 14c, 14b, 14c, 14d of the chassis 14. Further, a columnar support portion 40 for supporting the light guide plate 18 and the like is erected on the floor 14a near the wall 14c. The support portion 40 is made of the same material as the bottom 14a and the like, and the light guide plate 18 and the like are positioned on the floor 14a by the support portion 40.
 下敷板20は、表側から平面視した際に、横長の矩形状であり、所定の厚みを有する板状部材からなる。下敷板20は、導光板18と同材質からなり、例えば、ポリメタクリル酸メチル樹脂(PMMA)等のアクリル樹脂、メチルメタクリレート-スチレン共重合樹脂(MS樹脂)、ポリスチレン樹脂(PS樹脂)、ポリカーボネート樹脂(PC樹脂)等の樹脂からなる。 The underlay board 20 is a horizontally long rectangular shape when viewed from the front side, and is made of a plate-like member having a predetermined thickness. The underlay plate 20 is made of the same material as that of the light guide plate 18, and includes, for example, an acrylic resin such as polymethyl methacrylate resin (PMMA), a methyl methacrylate-styrene copolymer resin (MS resin), a polystyrene resin (PS resin), and a polycarbonate resin. (PC resin).
 下敷板20は、シャーシ14内に収納され、床14a上に敷かれる。下敷板20の長辺側における一方の端部には、床14a上の支持部40が嵌められる凹部(不図示)が設けられている。この凹部は、前記端部の中央に設けられており、下敷板20の一部が、厚み方向に貫通するように所定形状に切り欠かれたものからなる。下敷板20は、この凹部を利用して、シャーシ14内で位置決めされる。下敷板20の各端面と、シャーシ14の各壁14c,14b,14c,14dとの間には、それぞれ所定の隙間(間隔)が設けられている。各隙間は、下敷板20が熱膨張しても、各端面が、各壁14c,14b,14c,14dに対して、衝突しないように予め設けられている。なお、下敷板20の表面(表側の板面)及び裏面(裏側の板面)は、共に平坦である。 The underlay board 20 is accommodated in the chassis 14 and laid on the floor 14a. A concave portion (not shown) in which the support portion 40 on the floor 14 a is fitted is provided at one end portion on the long side of the underlay plate 20. The concave portion is provided at the center of the end portion, and is formed by cutting a part of the base plate 20 into a predetermined shape so as to penetrate in the thickness direction. The underlay plate 20 is positioned in the chassis 14 using this recess. Predetermined gaps (intervals) are provided between the end surfaces of the underlay plate 20 and the walls 14c, 14b, 14c, and 14d of the chassis 14, respectively. The gaps are provided in advance so that the end faces do not collide with the walls 14c, 14b, 14c, and 14d even when the underlay plate 20 is thermally expanded. The front surface (front surface plate surface) and the back surface (back surface plate surface) of the underlay plate 20 are both flat.
 反射シート19は、表側から平面視した際に、横長の矩形状であり、白色の発泡プラスチックシート(例えば、発泡ポリエチレンテレフタレートシート)からなる。この反射シート19は、床14a上に敷かれた下敷板20における表側の板面(表面20a)上に載せられる。反射シート19の大きさは、下敷板20よりも一回り程度、小さく設定されている。なお、反射シート19の長辺側における一方の端部にも、支持部40が嵌められる凹部(不図示)が設けられている。この凹部は、前記端部の中央に設けられており、反射シート19の一部が、所定形状に切り欠かれたものからなる。反射シート19は、この凹部を利用して、シャーシ14内で位置決めされる。 The reflection sheet 19 has a horizontally long rectangular shape when viewed from the front side, and is formed of a white foamed plastic sheet (for example, a foamed polyethylene terephthalate sheet). The reflection sheet 19 is placed on the front surface (surface 20a) of the base plate 20 laid on the floor 14a. The size of the reflection sheet 19 is set to be slightly smaller than the base plate 20. A concave portion (not shown) in which the support portion 40 is fitted is also provided at one end portion on the long side of the reflection sheet 19. The recess is provided at the center of the end, and a part of the reflection sheet 19 is cut out into a predetermined shape. The reflection sheet 19 is positioned in the chassis 14 using this recess.
 導光板18は、表側から平面視した際に、横長の矩形状であり、所定の厚みを有する板状部材からなる。本実施形態の導光板1は、下敷板20よりも厚みがある。導光板18は、透明度の高い材料からなり、例えば、ポリメタクリル酸メチル樹脂(PMMA)等のアクリル樹脂、メチルメタクリレート-スチレン共重合樹脂(MS樹脂)、ポリスチレン樹脂(PS樹脂)、ポリカーボネート樹脂(PC樹脂)等の透明な樹脂からなる。 The light guide plate 18 is a horizontally long rectangular shape when viewed from the front side and is made of a plate-like member having a predetermined thickness. The light guide plate 1 of the present embodiment is thicker than the underlay plate 20. The light guide plate 18 is made of a highly transparent material. For example, an acrylic resin such as polymethyl methacrylate resin (PMMA), methyl methacrylate-styrene copolymer resin (MS resin), polystyrene resin (PS resin), polycarbonate resin (PC). Resin).
 導光板18は、下敷板20の表側に、反射シート19を介して載せられる。つまり、導光板18は、その裏面181aが、下敷板20の表面20aと反射シート19を介して対向するように、シャーシ14内に収納される。導光板18は、その長辺側における一方の端部に、支持部40が嵌められる凹部(不図示)が設けられている。この凹部は、前記端部の中央に設けられており、導光板18の一部が、厚み方向に貫通するように所定形状に切り欠かれたものからなる。導光板18は、この凹部を利用して、シャーシ14内で位置決めされる。 The light guide plate 18 is placed on the front side of the underlay plate 20 via a reflection sheet 19. That is, the light guide plate 18 is accommodated in the chassis 14 so that the back surface 181a of the light guide plate 18 faces the front surface 20a of the base plate 20 with the reflection sheet 19 therebetween. The light guide plate 18 is provided with a recess (not shown) into which the support portion 40 is fitted at one end on the long side. The concave portion is provided at the center of the end portion, and is formed by cutting a part of the light guide plate 18 into a predetermined shape so as to penetrate in the thickness direction. The light guide plate 18 is positioned in the chassis 14 using this recess.
 導光板18の裏面181aには、光散乱部(不図示)が設けられている。この光散乱部は、白色を呈するドットパターンによって構成されており、光を散乱反射させる機能を有する。この光散乱部は、例えば、金属酸化物等の白色顔料を含有したペーストを、シルクスクリーン印刷機を利用して、導光板18の裏面181aに印刷することによって形成される。 A light scattering portion (not shown) is provided on the back surface 181 a of the light guide plate 18. The light scattering portion is configured by a white dot pattern and has a function of scattering and reflecting light. For example, the light scattering portion is formed by printing a paste containing a white pigment such as a metal oxide on the back surface 181a of the light guide plate 18 using a silk screen printer.
 光源ユニット17は、複数個のLED(Light Emitting Diode、光源)17aが一列に並ぶように実装されたLED基板(発光基板)17bからなる。 The light source unit 17 includes an LED substrate (light emitting substrate) 17b on which a plurality of LEDs (Light Emitting Diodes) 17a are mounted in a line.
 LED17aは、発光素子である複数個のLEDチップを樹脂材等でハウジング内に封止したもの(所謂、LEDパッケージ)からなり、白色発光するように構成されている。このLED17aとしては、例えば、主発光波長の異なる三種類のLEDチップを内蔵したものからなり、具体的には、各LEDチップが赤色(R)、緑色(G)、青色(B)を単色発光するように構成されている。なお、LED17aとしては、このような構成に限られず、他の構成であってもよい。LED17aの他の構成としては、例えば、青色(B)を単色発光するLEDチップを内蔵し、赤色(R)の領域に発光ピークを持つ蛍光体と、緑色(G)の領域に発光ピークを持つ蛍光体とが混入された樹脂(例えば、シリコン系樹脂)で、そのLEDチップを覆った構成であってもよい。また、他の構成としては、青色(B)を単色発光するLEDチップを内蔵し、YAG(イットリウム・アルミニウム・ガーネット)蛍光体等の黄色発光する蛍光体が混入された樹脂(例えば、シリコン系樹脂)で、そのLEDチップを覆った構成であってもよい。なお、本明細書では、LEDチップを内蔵するLED17a自体も、「発光素子」に含まれるものとする。 The LED 17a is composed of a plurality of LED chips, which are light emitting elements, sealed in a housing with a resin material or the like (so-called LED package), and is configured to emit white light. For example, the LED 17a includes three types of LED chips having different main emission wavelengths. Specifically, each LED chip emits red (R), green (G), and blue (B) in a single color. Is configured to do. In addition, as LED17a, it is not restricted to such a structure, Another structure may be sufficient. Other configurations of the LED 17a include, for example, an LED chip that emits blue (B) in a single color, a phosphor having a light emission peak in the red (R) region, and a light emission peak in the green (G) region. The LED chip may be covered with a resin mixed with a phosphor (for example, a silicon-based resin). Further, as another configuration, a resin (for example, a silicon-based resin) in which an LED chip that emits blue (B) in a single color is incorporated and a phosphor that emits yellow light such as YAG (yttrium, aluminum, garnet) phosphor is mixed. ), The LED chip may be covered. In the present specification, the LED 17 a itself incorporating the LED chip is also included in the “light emitting element”.
 LED基板17bは、アルミニウム系材料等の金属材料からなる長尺状の基材170と、この基材170上に形成される合成樹脂からなる絶縁層171と、この絶縁層171上に形成される銅箔等の金属膜からなる配線パターン(不図示)と、この配線パターンを覆うように前記絶縁層171上に形成される白色の絶縁膜(不図示)とを備える。このようなLED基板17b上に、複数個の前記LED17aが、前記配線パターンによって互いに直列接続するように実装されている。 The LED substrate 17b is formed on a long base material 170 made of a metal material such as an aluminum-based material, an insulating layer 171 made of a synthetic resin formed on the base material 170, and the insulating layer 171. A wiring pattern (not shown) made of a metal film such as a copper foil and a white insulating film (not shown) formed on the insulating layer 171 so as to cover the wiring pattern are provided. A plurality of the LEDs 17a are mounted on the LED substrate 17b so as to be connected in series with each other by the wiring pattern.
 前記LED17aは、外観形状が直方体であり、平坦な出光面70を備えている。前記LED基板17b上に、複数個のLED17aが等間隔で並ぶように実装されている。 The LED 17a has a rectangular parallelepiped appearance and includes a flat light exit surface 70. A plurality of LEDs 17a are mounted on the LED substrate 17b so as to be arranged at equal intervals.
 なお、照明装置12は、図示されないLEDドライバを備えており、このLEDドライバによって、LED基板17b上の各LED17aに電流が供給され、そして各LED17aがPWM(Pulse Width Modulation)制御で駆動される。なお、光源ユニット17には、放熱板等の放熱手段が取り付けられてもよい。 The lighting device 12 includes an LED driver (not shown), and current is supplied to each LED 17a on the LED substrate 17b by the LED driver, and each LED 17a is driven by PWM (Pulse Width Modulation) control. The light source unit 17 may be attached with heat radiating means such as a heat radiating plate.
 光源ユニット17は、図2及び図3に示されるように、下敷板20の端部(取付部)21に、取り付けられている。この端部(取付部)21は、導光板18よりも平面視外側に位置している。光源ユニット17は、下敷板20に取り付けられた状態で、シャーシ14内に収納される。光源ユニット17は、LED基板17b上の各LED17aが、導光板18の端面18bと向かい合うように、下敷板20上に配置される。各LED1の出光面70と、導光板18の端面18bとは、互いに所定の間隔(d1)を隔てて対向している。光源ユニット17は、LED基板17bが下敷板20の板面(表面20a)に対して、垂直に起立するように、L字状の固定金具(不図示)等を利用して、下敷板20の端部21に固定される。 The light source unit 17 is attached to an end portion (attachment portion) 21 of the base plate 20 as shown in FIGS. The end portion (attachment portion) 21 is located on the outer side in plan view than the light guide plate 18. The light source unit 17 is housed in the chassis 14 while being attached to the underlay plate 20. The light source unit 17 is arrange | positioned on the basement board 20 so that each LED17a on LED board 17b may face the end surface 18b of the light-guide plate 18. As shown in FIG. The light exit surface 70 of each LED 1 and the end surface 18b of the light guide plate 18 face each other with a predetermined distance (d1) therebetween. The light source unit 17 uses an L-shaped fixing bracket (not shown) or the like so that the LED substrate 17b stands vertically with respect to the plate surface (surface 20a) of the underlay plate 20. Fixed to the end 21.
 図4は、光源ユニット17、導光板18及び下敷板20の配置関係を示す平面図である。図4に示されるように、下敷板20の表側の板面(表面20a)上に、導光板18が載せられている。なお、図4には示されていないが、下敷板20と導光板18との間には、上述したように、反射シートが介在している。図4に示されるように、導光板18と下敷板20とは、共に矩形状であるものの、それらの大きさは、下敷板20の方が、導光板18よりも一回り大きく設定されている。 FIG. 4 is a plan view showing the arrangement relationship of the light source unit 17, the light guide plate 18 and the underlay plate 20. As shown in FIG. As shown in FIG. 4, the light guide plate 18 is placed on the front surface (surface 20 a) of the base plate 20. Although not shown in FIG. 4, the reflection sheet is interposed between the base plate 20 and the light guide plate 18 as described above. As shown in FIG. 4, the light guide plate 18 and the base plate 20 are both rectangular, but the size of the base plate 20 is set to be slightly larger than that of the light guide plate 18. .
 このような大小関係を有する導光板18と下敷板20とは、長辺側の各端面20c及び端面18cが、互いに一致するように揃えられている。なお、図4に示されるように、導光板18の端面18c側における端部には、支持部40が嵌る凹部182が設けられている。 The light guide plate 18 and the base plate 20 having such a magnitude relationship are aligned so that the end surfaces 20c and the end surfaces 18c on the long side coincide with each other. In addition, as FIG. 4 shows, the recessed part 182 in which the support part 40 fits in the edge part in the end surface 18c side of the light-guide plate 18 is provided.
 下敷板20の短辺側における長さL2は、導光板18の短辺側における長さL1よりも長くなっている。そのため、下敷板20の端面20b側の端部21が、導光板18の端面18b側の端部よりも、外側(平面視外側)に配置される。つまり、短辺方向(Y軸方向)において、下敷板20の端部21が、導光板18からはみ出している。このはみ出した部分(端部21)に、光源ユニット17が取り付けられる。光源ユニット17の各LEDaは、導光板18の端面18bと向かい合うように設定されている。 The length L2 on the short side of the base plate 20 is longer than the length L1 on the short side of the light guide plate 18. Therefore, the end portion 21 on the end surface 20 b side of the underlay plate 20 is disposed on the outer side (outside in plan view) than the end portion on the end surface 18 b side of the light guide plate 18. That is, the end portion 21 of the base plate 20 protrudes from the light guide plate 18 in the short side direction (Y-axis direction). The light source unit 17 is attached to the protruding portion (end portion 21). Each LEDa of the light source unit 17 is set to face the end face 18b of the light guide plate 18.
 なお、ここでの長さL1,L2は、共に室温時の状態(熱膨張する前の状態)におけるものである。導光板18の長さL1は、光源ユニット17と対向する側の端面18bから支持部40と接触する側の端面18cまでの距離であり、下敷板20の長さL2は、光源ユニット17が取り付けられる側の端面20bから支持部40と接触する側の端面20cまでの距離である。導光板18及び下敷板20は、上述したように、共に同材質からなるため、同じ熱膨張率(線膨張率)を有する。導光板18及び下敷板20は、共に熱膨張すると、支持部40と接触する側の端部を基点(起点)として、外側(シャーシ14の壁14b側)へ向かって伸びる。つまり、導光板18及び下敷板20は、同じ方向に熱膨張し、それぞれの端部が同じ方向に移動する。なお、温度が低下して元の大きさまで収縮する場合も、導光板18及び下敷板20の各端部は、共に移動する。 Note that the lengths L1 and L2 here are in a state at room temperature (a state before thermal expansion). The length L1 of the light guide plate 18 is the distance from the end surface 18b on the side facing the light source unit 17 to the end surface 18c on the side in contact with the support portion 40, and the length L2 of the underlay plate 20 is attached to the light source unit 17 It is the distance from the end surface 20b on the side to be contacted to the end surface 20c on the side in contact with the support portion 40. Since the light guide plate 18 and the underlay plate 20 are both made of the same material as described above, they have the same thermal expansion coefficient (linear expansion coefficient). When both the light guide plate 18 and the underlay plate 20 are thermally expanded, the light guide plate 18 and the underlay plate 20 extend toward the outside (the wall 14b side of the chassis 14) with the end portion on the side in contact with the support portion 40 as a base point (starting point). That is, the light guide plate 18 and the base plate 20 are thermally expanded in the same direction, and the respective end portions move in the same direction. Even when the temperature decreases and contracts to the original size, the end portions of the light guide plate 18 and the underlay plate 20 move together.
 光学部材15は、図2に示されるように、液晶パネル11等と同様、表側から平面視した際に、横長の矩形状であり、拡散シート15a、レンズシート15b、及び反射型偏光シート15cの積層物からなる。光学部材15は、導光板18の表面18aを覆うように、その表側に配置される。拡散シート15a、レンズシート15b、及び反射型偏光シート15cは、この順で、導光板18の表面18a上に積層されている。拡散シート15aは、例えば、合成樹脂製の透光性基材の表面に、光散乱粒子を分散配合した拡散層を貼り合せたものからなる。この拡散シート15aは、導光板18の表面18aから出射された光を拡散する機能を有する。レンズシート15bは、例えば、合成樹脂製の透光性基材の表面に、凸レンズが形成されたものからり、拡散シート15aを通過した光の進行方向を調節する機能を有する。反射型偏光シート15cは、透過偏光軸と直交する振動面を持つ直線偏光を反射させる機能を有し、例えば、住友スリーエム株式会社製の商品名DBEF(Dual Brightness Enhancement Film)からなる。なお、図2及び図3に示されるように、光学部材15の上方に、液晶パネル11が配置される。 As shown in FIG. 2, the optical member 15 has a horizontally long rectangular shape when viewed from the front side, like the liquid crystal panel 11 and the like. The optical member 15 includes a diffusion sheet 15a, a lens sheet 15b, and a reflective polarizing sheet 15c. It consists of a laminate. The optical member 15 is disposed on the front side so as to cover the surface 18 a of the light guide plate 18. The diffusion sheet 15a, the lens sheet 15b, and the reflective polarizing sheet 15c are laminated on the surface 18a of the light guide plate 18 in this order. The diffusion sheet 15a is formed, for example, by bonding a diffusion layer in which light scattering particles are dispersed and bonded to the surface of a transparent base made of synthetic resin. The diffusion sheet 15 a has a function of diffusing light emitted from the surface 18 a of the light guide plate 18. The lens sheet 15b has a function of adjusting the traveling direction of light that has passed through the diffusion sheet 15a, for example, from a surface of a synthetic resin-made translucent base material on which a convex lens is formed. The reflective polarizing sheet 15c has a function of reflecting linearly polarized light having a vibration plane orthogonal to the transmission polarization axis, and is made of, for example, a trade name DBEF (Dual Brightness Enhancement Film) manufactured by Sumitomo 3M Limited. As shown in FIGS. 2 and 3, the liquid crystal panel 11 is disposed above the optical member 15.
 フレーム16は、液晶パネル11及び導光板18等の周縁に沿った額縁状(枠状)であり、合成樹脂製からなる。フレーム16は黒色であり、遮光性を有する。図3に示されるように、フレーム16は、導光板18及び光学部材15等を収容したシャーシ14に上側から被せられる。そしてフレーム16の内周縁が、導光板18の周端部(周縁)に、光学部材15を介して載せられる。フレーム16は、シャーシ14の各壁14b,14c,14d,14eに、ねじ等で固定される。なおフレーム16の内周縁で、液晶パネル11の外周縁を支えられるように、フレーム16上に液晶パネル11が載せられる。 The frame 16 has a frame shape (frame shape) along the periphery of the liquid crystal panel 11 and the light guide plate 18 and is made of synthetic resin. The frame 16 is black and has a light shielding property. As shown in FIG. 3, the frame 16 covers the chassis 14 containing the light guide plate 18 and the optical member 15 from the upper side. The inner peripheral edge of the frame 16 is placed on the peripheral end (periphery) of the light guide plate 18 via the optical member 15. The frame 16 is fixed to each wall 14b, 14c, 14d, 14e of the chassis 14 with screws or the like. The liquid crystal panel 11 is placed on the frame 16 so that the inner peripheral edge of the frame 16 can support the outer peripheral edge of the liquid crystal panel 11.
 液晶パネル11は、その外周縁が、フレーム16とこのフレーム16の上側から被せられた上述の額縁状のベゼル13とによって挟まれて固定される。なお、ベゼル13はフレーム16等と共にシャーシ14の各壁14b,14c,14d,14eにねじ等によって固定される。 The outer peripheral edge of the liquid crystal panel 11 is fixed by being sandwiched between the frame 16 and the above-described frame-shaped bezel 13 covered from above the frame 16. The bezel 13 is fixed to the walls 14b, 14c, 14d, and 14e of the chassis 14 together with the frame 16 and the like by screws or the like.
 液晶表示装置10は、液晶パネル11の表面(表示面10a)に画像を表示させる際、照明装置12の光源ユニット17が発光する。光源ユニット17が発光すると(つまり、各LED17aが発光すると)、導光板18の端面18bからその内部に光が入射する。入射した光は、導光板18の裏側に敷かれている反射シート19、導光板の裏面181a上に形成されている光散乱部(不図示)等によって反射等されて、導光板18内を進みつつ、その表面18aから出射する。出射した光は、光学部材15を通過して面状に拡がった光となり、液晶パネル11の背面を照らす。液晶パネル11は、この照明装置12からの光を利用して、表面(表示面10a)に画像を表示させる。 When the liquid crystal display device 10 displays an image on the surface (display surface 10a) of the liquid crystal panel 11, the light source unit 17 of the illumination device 12 emits light. When the light source unit 17 emits light (that is, when each LED 17a emits light), light enters the inside from the end face 18b of the light guide plate 18. The incident light is reflected by a reflection sheet 19 laid on the back side of the light guide plate 18, a light scattering portion (not shown) formed on the back surface 181 a of the light guide plate, etc., and proceeds in the light guide plate 18. While exiting from the surface 18a. The emitted light passes through the optical member 15 and becomes light spread in a planar shape, and illuminates the back surface of the liquid crystal panel 11. The liquid crystal panel 11 displays an image on the surface (display surface 10a) using the light from the illumination device 12.
 上記のように液晶表示装置10(液晶パネル11)に画像が表示されると、照明装置12の光源ユニット17(LED基板17b)、ドライバ(LEDドライバ)等が発熱する。すると、導光板18が熱を受けて熱膨張する。それと共に下敷板20も熱を受けて熱膨張する。図5は、熱膨張前の導光板18及び下敷板20の配置関係を示す平面図であり、図6は、熱膨張後の導光板18及び下敷板20の配置関係を示す平面図である。ここで、主に図5及び図6を参照しつつ、熱膨張前後における導光板18及び下敷板20の配置関係を説明する。 When an image is displayed on the liquid crystal display device 10 (liquid crystal panel 11) as described above, the light source unit 17 (LED substrate 17b), the driver (LED driver), and the like of the illumination device 12 generate heat. Then, the light guide plate 18 receives heat and expands thermally. At the same time, the base plate 20 receives heat and expands thermally. FIG. 5 is a plan view showing the positional relationship between the light guide plate 18 and the base plate 20 before thermal expansion, and FIG. 6 is a plan view showing the positional relationship between the light guide plate 18 and the base plate 20 after thermal expansion. Here, the arrangement relationship between the light guide plate 18 and the base plate 20 before and after thermal expansion will be described mainly with reference to FIGS. 5 and 6.
 図5には、図4に示される導光板18及び下敷板20の一部分が、模式的に示されている。図5に示されるように、熱膨張前における導光板18の端面18bと、光源ユニット17の各LED17a(出光面70)との間には、間隔d1が設けられている。照明装置12が点灯して発熱すると、導光板18及び下敷板20は共に加熱されて熱膨張する。導光板18及び下敷板20が熱膨張すると、短辺方向(Y軸方向)のみならず、長辺方向(X軸方向)にも伸びる。但し、ここでは導光板18及び下敷板20の短辺方向(Y軸方向)における熱膨張についてのみ説明する。 FIG. 5 schematically shows a part of the light guide plate 18 and the base plate 20 shown in FIG. As shown in FIG. 5, a gap d <b> 1 is provided between the end surface 18 b of the light guide plate 18 before thermal expansion and each LED 17 a (light output surface 70) of the light source unit 17. When the lighting device 12 is turned on and generates heat, the light guide plate 18 and the underlay plate 20 are both heated and thermally expanded. When the light guide plate 18 and the base plate 20 are thermally expanded, they extend not only in the short side direction (Y-axis direction) but also in the long side direction (X-axis direction). However, here, only thermal expansion in the short side direction (Y-axis direction) of the light guide plate 18 and the underlay plate 20 will be described.
 上述したように、導光板18の端面18cと、下敷板20の端面20cとは互いに一致するように揃えられている(図4参照)。そして導光板18の端面18c側における端部と、下敷板20の端面20c側における端部とは、共に支持部40によって位置決めされている。このように位置決めされている導光板18が熱膨張すると、導光板18は支持部40から遠ざかる方向に向かって伸びる。本実施形態においては、導光板18の短辺側(短辺方向)における長さがx1増加するものとする。また、下敷板20が熱膨張すると、導光板18と同様に、下敷板20は支持部40から遠ざかる方向に向かって伸びる。つまり、導光板18と、下敷板20とは、共に同じ方向に熱膨張する。本実施形態においては、下敷板20の短辺側(短辺方向)における長さがx2増加するものとする。なお、下敷板20が熱膨張すると、その端部(取付部)21上に配置されている光源ユニット17も、下敷板20と共に、支持部40から遠ざかる方向へ移動する。 As described above, the end surface 18c of the light guide plate 18 and the end surface 20c of the underlay plate 20 are aligned with each other (see FIG. 4). The end portion on the end surface 18 c side of the light guide plate 18 and the end portion on the end surface 20 c side of the underlay plate 20 are both positioned by the support portion 40. When the light guide plate 18 thus positioned is thermally expanded, the light guide plate 18 extends in a direction away from the support portion 40. In the present embodiment, the length on the short side (short side direction) of the light guide plate 18 is increased by x1. Further, when the base plate 20 is thermally expanded, the base plate 20 extends in a direction away from the support portion 40 as in the light guide plate 18. That is, the light guide plate 18 and the underlay plate 20 both thermally expand in the same direction. In the present embodiment, the length on the short side (short side direction) of the base plate 20 is assumed to increase by x2. Note that when the base plate 20 is thermally expanded, the light source unit 17 disposed on the end portion (attachment portion) 21 also moves in a direction away from the support portion 40 together with the base plate 20.
 図4等に示されるように、熱膨張前の導光板18における短辺側の長さL1は、下敷板20における短辺側の長さL2よりも、短く設定されている。上述したように、下敷板20は、導光板18と同材質からなるため、導光板18の短辺方向における熱膨張率(線膨張率)α1と、下敷板20の短辺方向における熱膨張率(線膨張率)α2とが等しくなっている。したがって、熱膨張前の温度が、共に常温(室温)である導光板18及び下敷板20が、共に加熱されて温度がt1上昇すると、それらの伸び(増加分)は、熱膨張前(常温時)の各長さ(短辺側の長さ)に比例することになる。つまり、熱膨張前の導光板18の短辺側における長さL1が、熱膨張前の下敷板20の短辺側における長さL2よりも短く設定されているため、導光板18の伸びx1も、下敷板20の伸びx2よりも短く(小さく)なる。 As shown in FIG. 4 and the like, the length L1 on the short side of the light guide plate 18 before thermal expansion is set to be shorter than the length L2 on the short side of the underlay plate 20. As described above, since the base plate 20 is made of the same material as the light guide plate 18, the thermal expansion coefficient (linear expansion coefficient) α <b> 1 in the short side direction of the light guide plate 18 and the thermal expansion coefficient in the short side direction of the base plate 20. (Linear expansion coefficient) α2 is equal. Therefore, when both the light guide plate 18 and the base plate 20 whose temperature before thermal expansion is normal temperature (room temperature) are heated and the temperature rises by t1, their elongation (increase) is increased before thermal expansion (at normal temperature). ) (The length on the short side). That is, since the length L1 on the short side of the light guide plate 18 before thermal expansion is set shorter than the length L2 on the short side of the base plate 20 before thermal expansion, the extension x1 of the light guide plate 18 is also set. , It becomes shorter (smaller) than the extension x2 of the underlay plate 20.
 上述したように、熱膨張前における導光板18の端面18bと、光源ユニット17の各LED17a(出光面70)との間には、図5に示されるように、間隔d1が設けられている。また、熱膨張後における導光板18の端面18bと、光源ユニット17の各LED17a(出光面70)との間にも、図6に示されるように、間隔d2が維持されている。つまり、本実施形態の照明装置12は、導光板18が熱膨張しても、その端面18bが、光源ユニット17と接触することが抑制される。以下、その原理を説明する。 As described above, a gap d1 is provided between the end face 18b of the light guide plate 18 before thermal expansion and each LED 17a (light exit surface 70) of the light source unit 17, as shown in FIG. Further, as shown in FIG. 6, the distance d <b> 2 is also maintained between the end surface 18 b of the light guide plate 18 after thermal expansion and each LED 17 a (light output surface 70) of the light source unit 17. That is, in the lighting device 12 of the present embodiment, even when the light guide plate 18 is thermally expanded, the end surface 18 b is suppressed from contacting the light source unit 17. The principle will be described below.
 導光板18が熱膨張すると、その端面18cが下敷板20の端部21上に取り付けられている光源ユニット17に近付くように移動する。また、導光板18の熱膨張と共に、下敷板20も熱膨張するため、光源ユニット17は導光板18から遠ざかるように移動する。上述したように、導光板18の短辺側における伸びx1は、下敷板20の短辺側における伸びx2よりも短い(小さい)。つまり、熱膨張時における導光板18の移動距離の方が、光源ユニット17の移動距離よりも短くなっているため、熱膨張した導光板18が光源ユニット17に追いついてしまうことがない。しかも、導光板18の端面18bと、光源ユニット17(各LED17aの出光面70)との間には、少なくとも熱膨張前に設定した間隔d1が維持される。このようにして、導光板18が熱膨張しても、その端面18cが光源ユニット17と接触することが抑制されている。 When the light guide plate 18 is thermally expanded, the end surface 18c moves so as to approach the light source unit 17 attached on the end portion 21 of the underlay plate 20. Further, as the light guide plate 18 is thermally expanded, the underlay plate 20 is also thermally expanded, so that the light source unit 17 is moved away from the light guide plate 18. As described above, the extension x1 on the short side of the light guide plate 18 is shorter (smaller) than the extension x2 on the short side of the underlay plate 20. In other words, since the moving distance of the light guide plate 18 at the time of thermal expansion is shorter than the moving distance of the light source unit 17, the thermally expanded light guide plate 18 does not catch up with the light source unit 17. Moreover, at least the distance d1 set before the thermal expansion is maintained between the end surface 18b of the light guide plate 18 and the light source unit 17 (the light exit surface 70 of each LED 17a). In this way, even if the light guide plate 18 is thermally expanded, the end surface 18c is prevented from coming into contact with the light source unit 17.
 なお、照明装置12が消灯して、導光板18及び下敷板20の温度が低下すると、それらは収縮して、それぞれ元の大きさに戻る(図4及び図5参照)。この際、導光板18の端面18b側の端部は、熱膨張時とは反対に支持部40側に向かって移動する。また、下敷板20の端面20b側の端部も、熱膨張時とは反対に支持部40側に向かって移動する。導光板18及び下敷板20が、共に熱膨張した状態から元の状態(熱膨張前の室温状態)へ戻る際も、光源ユニット17と導光板18の端面18bとの接触は抑制される。 When the lighting device 12 is turned off and the temperature of the light guide plate 18 and the underlay plate 20 is lowered, they contract and return to their original sizes (see FIGS. 4 and 5). At this time, the end of the light guide plate 18 on the side of the end surface 18b moves toward the support portion 40, contrary to the thermal expansion. Further, the end portion on the end surface 20b side of the underlay plate 20 also moves toward the support portion 40 side, contrary to the time of thermal expansion. Even when both the light guide plate 18 and the underlay plate 20 return from the thermally expanded state to the original state (the room temperature state before the thermal expansion), the contact between the light source unit 17 and the end surface 18b of the light guide plate 18 is suppressed.
 以上のように、本実施形態の照明装置12は、導光板18が熱膨張しても、その端面18bが、光源ユニット17との接触が抑制される。そして、本実施形態の照明装置12は、実質的に、導光板18に対する光の入射効率(導入効率)を高めることができる。何故ならば、本実施形態における照明装置12の構成であれば、導光板18の端面18bと、光源ユニット17との間隔d1を極力狭く設定できるからである。間隔d1を狭く設定しても、上述したように、導光板18は熱膨張しても光源ユニット17と接触しないため、光源ユニット17の破損等を防止できる。 As described above, in the illuminating device 12 of the present embodiment, even when the light guide plate 18 is thermally expanded, the contact between the end surface 18b and the light source unit 17 is suppressed. And the illuminating device 12 of this embodiment can raise the incident efficiency (introduction efficiency) of the light with respect to the light-guide plate 18 substantially. This is because the distance d1 between the end face 18b of the light guide plate 18 and the light source unit 17 can be set as narrow as possible in the configuration of the illumination device 12 in the present embodiment. Even if the interval d1 is set narrow, as described above, the light guide plate 18 does not come into contact with the light source unit 17 even if it thermally expands, so that the light source unit 17 can be prevented from being damaged.
 本実施形態の照明装置12は、導光板18の裏側(裏面181a側)に、下敷板20が配置されているため、導光板18と下敷板20との間に介在されている反射シート19の信頼性も向上する。反射シート19は、導光板18等と比べて厚みが薄いため、撓みやすくシワがより易い。しかしながら、本実施形態においては、反射シート19は、導光板18における裏側の板面(裏面181a)と、下敷板20における表側の板面(表面20a)との間で、拡がった状態で挟まれているため、撓み、シワの発生が防止されている。したがって、反射シート19の性能が、導光板18の裏側に配置した下敷板20によって確保されていることになる。また、反射シート19の信頼性が向上することによって、照明装置12における光の利用効率も上がることになる。 In the illuminating device 12 of the present embodiment, since the base plate 20 is disposed on the back side (the back surface 181a side) of the light guide plate 18, the reflective sheet 19 interposed between the light guide plate 18 and the base plate 20 is provided. Reliability is also improved. Since the reflection sheet 19 is thinner than the light guide plate 18 and the like, it is easy to bend and wrinkle more easily. However, in the present embodiment, the reflection sheet 19 is sandwiched between the back plate surface (back surface 181a) of the light guide plate 18 and the front plate surface (surface 20a) of the underlay plate 20. Therefore, the occurrence of bending and wrinkles is prevented. Therefore, the performance of the reflection sheet 19 is ensured by the base plate 20 disposed on the back side of the light guide plate 18. Moreover, the use efficiency of the light in the illuminating device 12 also improves by improving the reliability of the reflective sheet 19.
 本実施形態の照明装置12においては、反射シート19及び導光板18が、下敷板20によって、シャーシ14の底14a等との接触による摩耗、損傷等から保護されている。シャーシ14は、上述したように、金属材料からなる板材を加工したもの等からなるため、一般的に、導光板18等よりも硬い。そのため、シャーシ14の床14a上に、凹凸が形成されていると、その部分が、導光板18及び反射シート19と引っ掛かる等して、それらを傷つけてしまうことがある。しかしながら、本実施形態のように、床14a上に下敷板20が敷かれていると、導光板18及び反射シート19は、下敷板20によって保護され、床14a等との接触によって損傷等することが抑制される。 In the lighting device 12 of the present embodiment, the reflection sheet 19 and the light guide plate 18 are protected by the underlay plate 20 from wear, damage, and the like due to contact with the bottom 14a of the chassis 14 and the like. As described above, the chassis 14 is generally harder than the light guide plate 18 and the like because it is formed by processing a plate material made of a metal material. Therefore, if irregularities are formed on the floor 14 a of the chassis 14, the portion may be caught by the light guide plate 18 and the reflection sheet 19, and may be damaged. However, when the underlay plate 20 is laid on the floor 14a as in this embodiment, the light guide plate 18 and the reflection sheet 19 are protected by the underlay plate 20, and are damaged by contact with the floor 14a and the like. Is suppressed.
 本実施形態の照明装置12は、シャーシ14の床14a上に、下敷板20が配置されることによって、照明装置12全体の剛性も向上している。 In the lighting device 12 of the present embodiment, the base plate 20 is disposed on the floor 14a of the chassis 14, whereby the rigidity of the entire lighting device 12 is also improved.
<実施形態2>
 次に、本発明の実施形態2を、図7を参照しつつ説明する。図7は、実施形態2における照明装置12Aの導光板18及び下敷板20の配置関係を示す平面図である。説明の便宜上、図7では、照明装置12Aが備えるシャーシ等は、省略されている。この照明装置12Aの基本的な構成は、実施形態1のものと同様である。但し、導光板18及び下敷板20の位置決めの仕方、及び光源ユニット17の配置個所等が異なっている。
<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG. FIG. 7 is a plan view showing the positional relationship between the light guide plate 18 and the base plate 20 of the illumination device 12A according to the second embodiment. For convenience of explanation, the chassis and the like included in the illumination device 12A are omitted in FIG. The basic configuration of the illumination device 12A is the same as that of the first embodiment. However, the positioning method of the light guide plate 18 and the underlay plate 20 and the location of the light source unit 17 are different.
 本実施形態の下敷板20も、実施形態1と同様、導光板18と同材質(例えば、アクリル樹脂)からなる。この下敷板20は、導光板18よりも、短辺側の長さが長くなるように設定されている。つまり、下敷板20における長辺側の両端部21,21が、共に導光板18における長辺側の両端部よりも、外側(平面視外側)にはみ出している。なお、下敷板20の長辺側の長さと、導光板18の長辺側の長さとは、同じに設定されている。 The underlay plate 20 of this embodiment is also made of the same material as the light guide plate 18 (for example, acrylic resin), as in the first embodiment. The underlay plate 20 is set so that the length on the short side is longer than that of the light guide plate 18. That is, both end portions 21, 21 on the long side of the base plate 20 protrude outward (outside in plan view) from both end portions on the long side of the light guide plate 18. The length of the long side of the base plate 20 and the length of the long side of the light guide plate 18 are set to be the same.
 図7に示されるように、導光板18は、その短辺側の両端部に、それぞれ凹部182,182が設けられている。一方の凹部182は、端面18d側における端部の中央に設けられており、他方の凹部182は、端面18e側における端部の中央に設けられている。これらの凹部182,182には、シャーシの底に立設されている2つの支持部40,40がそれぞれ嵌められている。つまり、導光板18は、短辺側における両端部が、2つの支持部40,40によって挟まるようにして、シャーシの床上で位置決めされている。 As shown in FIG. 7, the light guide plate 18 is provided with recesses 182 and 182 at both ends on the short side. One recess 182 is provided at the center of the end on the end surface 18d side, and the other recess 182 is provided at the center of the end on the end surface 18e side. Two support portions 40, 40 standing on the bottom of the chassis are fitted in these recesses 182, 182, respectively. That is, the light guide plate 18 is positioned on the floor of the chassis so that both end portions on the short side are sandwiched between the two support portions 40 and 40.
 下敷板20も、導光板18と同様に、その短辺側の両端部に、それぞれ凹部(不図示)が設けられている。これらの凹部には、前記支持部40,40がそれぞれ嵌められている。つまり、下敷板20及び導光板18は、共通の支持部40によってシャーシの床上で位置決めされている。なお、下敷板20と導光板18との間には、反射シートが介在されているが、説明の便宜上、図7では反射シートが省略されている。この反射シートも、前記支持部40,40によって位置決めされている。 Similarly to the light guide plate 18, the underlay plate 20 is also provided with recesses (not shown) at both ends on its short side. The support portions 40 are fitted in these recesses. That is, the base plate 20 and the light guide plate 18 are positioned on the floor of the chassis by the common support portion 40. Although a reflective sheet is interposed between the underlay plate 20 and the light guide plate 18, the reflective sheet is omitted in FIG. 7 for convenience of explanation. This reflection sheet is also positioned by the support portions 40 and 40.
 図7に示されるように、本実施形態の照明装置12Aは、導光板18の長辺側における2つの端面18b,18cに対して、それぞれ光源ユニット17,17が対向するように配置されている。各光源ユニット17,17は、下敷板20における長辺側の両端部(取付部)21,21に固定されている。導光板18の各端面18b,18cと、各光源ユニット17,17との間には、所定の間隔が設けられている。このような照明装置12Aにおいて、導光板18が熱膨張すると、それぞれの端面18b,18cが、それぞれの光源ユニット17,17に近付くように移動する。つまり、導光板18の端面18b側における端部は、支持部40から遠ざかる方向に向かって伸び、導光板18の端面18c側における端部も、支持部40から遠ざかる方向に向かって伸びる。したがって、導光板18が熱膨張すると、長辺側の両端部は、互いに離れるように移動することになる。下敷板20についても、導光板18と同様に、熱膨張すると、長辺側の両端部が互いに離れるように移動する。 As shown in FIG. 7, the illuminating device 12 </ b> A of the present embodiment is arranged such that the light source units 17 and 17 face the two end surfaces 18 b and 18 c on the long side of the light guide plate 18, respectively. . Each light source unit 17, 17 is fixed to both ends (attachment portions) 21, 21 on the long side of the underlay plate 20. A predetermined interval is provided between each end face 18 b, 18 c of the light guide plate 18 and each light source unit 17, 17. In such an illuminating device 12 </ b> A, when the light guide plate 18 is thermally expanded, the respective end surfaces 18 b and 18 c move so as to approach the respective light source units 17 and 17. That is, the end portion on the end surface 18 b side of the light guide plate 18 extends in a direction away from the support portion 40, and the end portion on the end surface 18 c side of the light guide plate 18 also extends in a direction away from the support portion 40. Therefore, when the light guide plate 18 is thermally expanded, both end portions on the long side are moved away from each other. Similarly to the light guide plate 18, the underlay plate 20 also moves so that both ends on the long side are separated from each other when thermally expanded.
 本実施形態の照明装置12においても、導光板18が熱膨張して移動する距離(導光板の増加分)よりも、下敷板20が熱膨張して移動する距離(下敷板の増加分)の方が長いため、実施形態1と同様の原理で、導光板18の各端面18b,18cと、各光源ユニット17との接触が抑制される。本実施形態においても、支持部40と接触している部分が基点(起点)となって、導光板18及び下敷板20が、同じ方向に熱膨張して伸びるように構成されている。 Also in the illuminating device 12 of this embodiment, the distance (increase in the underlaying plate) that the underlay plate 20 is moved in thermal expansion than the distance in which the light guide plate 18 moves due to thermal expansion (increase in the amount of light guide plate). Since the length is longer, the contact between each end face 18b, 18c of the light guide plate 18 and each light source unit 17 is suppressed by the same principle as in the first embodiment. Also in the present embodiment, the portion that is in contact with the support portion 40 serves as a base point (starting point), and the light guide plate 18 and the base plate 20 are configured to thermally expand in the same direction and extend.
<実施形態3>
 次に、本発明の実施形態3を、図8を参照しつつ説明する。図8は、実施形態3における照明装置12Bの導光板18及び下敷板20の配置関係を示す説明図である。この照明装置12Bは、図7に示される照明装置12Aから、導光板18の端面18c側に配置されている光源ユニット17を取り除いたものである。本実施形態3の照明装置12Bと、実施形態1の照明装置12とは、共に導光板18の1つの端面18bに対応するように、光源ユニット17が配置されている。但し、導光板18及び下敷板20の支持部40による位置決めの仕方(個所)が互いに異なっている。
<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIG. FIG. 8 is an explanatory diagram showing the positional relationship between the light guide plate 18 and the base plate 20 of the lighting device 12B according to the third embodiment. This illuminating device 12B is obtained by removing the light source unit 17 arranged on the end face 18c side of the light guide plate 18 from the illuminating device 12A shown in FIG. The light source unit 17 is arrange | positioned so that both the illuminating device 12B of this Embodiment 3 and the illuminating device 12 of Embodiment 1 may respond | correspond to the one end surface 18b of the light-guide plate 18. FIG. However, the positioning methods (locations) of the light guide plate 18 and the base plate 20 by the support portion 40 are different from each other.
 しかしながら、これらは、導光板18及び下敷板20が支持部40と接触している部分が、共に熱膨張の基点(起点)となっており、共に同じ原理で、導光板18と、光源ユニット17との接触が抑制されている。 However, in these parts, the portion where the light guide plate 18 and the base plate 20 are in contact with the support portion 40 is the base point (starting point) of thermal expansion, and both the light guide plate 18 and the light source unit 17 are based on the same principle. Contact with is suppressed.
<実施形態4>
 次に、本発明の実施形態4を、図9を参照しつつ説明する。図9は、実施形態4の液晶表示装置10Cにおける短辺方向の断面図である。本実施形態の液晶表示装置10Cは、その基本的な構成は、実施形態1のものと同様である。但し、本実施形態の液晶表示装置10Cは、下敷板20が、シャーシ14の床14aに対して、両面テープ30で固定されている点と、支持ピン(支持部)40が下敷板20に固定されている点等が異なっている。
<Embodiment 4>
Next, Embodiment 4 of the present invention will be described with reference to FIG. FIG. 9 is a cross-sectional view in the short side direction of the liquid crystal display device 10C of the fourth embodiment. The basic configuration of the liquid crystal display device 10C of the present embodiment is the same as that of the first embodiment. However, in the liquid crystal display device 10 </ b> C of the present embodiment, the base plate 20 is fixed to the floor 14 a of the chassis 14 with the double-sided tape 30, and the support pins (support portions) 40 are fixed to the base plate 20. What is different is different.
 本実施形態の照明装置12Cは、導光板18における短辺側の両端部に、それぞれ凹部182が形成されている。この凹部182は、短辺側における各端部の中央にそれぞれ設けられている。そして、この凹部182内には、支持ピン(支持部)40cが挿入されている。支持ピン40cは、裏側の板面から表側の板面に向けて下敷板20に挿し込まれており、下敷板20に直接、固定されている。支持ピン40cは、その根元部分の周囲にねじ部(不図示)を有しており、下敷板20に対して螺着されている。 In the illuminating device 12C of the present embodiment, concave portions 182 are formed at both ends of the light guide plate 18 on the short side. The recess 182 is provided in the center of each end on the short side. And in this recessed part 182, the support pin (support part) 40c is inserted. The support pins 40c are inserted into the base plate 20 from the back plate surface to the front plate surface, and are directly fixed to the base plate 20. The support pin 40 c has a threaded portion (not shown) around its root portion and is screwed to the underlay plate 20.
 下敷板20の両端部21,21は、導光板18の外側にはみ出しており、各端部(取付部)21,21に、光源ユニット17,17が取り付けられている。本実施形態の液晶表示装置10Cは、導光板18は熱膨張するものの、下敷板20は殆ど熱膨張しない場合に、好適な構成である。本実施形態においては、導光板18と下敷板20とは、共に同材質からなる。但し、他の実施形態においては、下敷板20は、導光板18よりも熱膨張し難い材質から形成されてもよい。 Both end portions 21, 21 of the underlay plate 20 protrude outside the light guide plate 18, and light source units 17, 17 are attached to the respective end portions (attachment portions) 21, 21. The liquid crystal display device 10 </ b> C of the present embodiment has a preferable configuration when the light guide plate 18 is thermally expanded but the underlay plate 20 is hardly thermally expanded. In the present embodiment, the light guide plate 18 and the underlay plate 20 are both made of the same material. However, in other embodiments, the base plate 20 may be formed of a material that is less likely to thermally expand than the light guide plate 18.
 本実施形態の照明装置12Cは、導光板18の裏側に、下敷板20が配置されているため、導光板18と下敷板20との間に介在されている反射シート19の信頼性が向上している。また、照明装置12Cにおいては、反射シート19及び導光板18が、下敷板20によって、シャーシ14の底14a等との接触による摩耗、損傷等から保護されている。なお、照明装置12Cは、シャーシ14の床14a上に、下敷板20が配置されることによって、照明装置12C全体の剛性も向上している。なお、他の実施形態においては、下敷板20は両面テープ30ではなく、ねじ(ビス)等でシャーシ14の床14a上に固定されてもよい。 In the illuminating device 12 </ b> C of the present embodiment, since the base plate 20 is disposed on the back side of the light guide plate 18, the reliability of the reflection sheet 19 interposed between the light guide plate 18 and the base plate 20 is improved. ing. In the illumination device 12C, the reflection sheet 19 and the light guide plate 18 are protected by the underlay plate 20 from abrasion, damage, and the like due to contact with the bottom 14a of the chassis 14 and the like. In addition, the illuminating device 12 </ b> C has improved the rigidity of the entire illuminating device 12 </ b> C by disposing the base plate 20 on the floor 14 a of the chassis 14. In other embodiments, the underlay plate 20 may be fixed on the floor 14a of the chassis 14 with screws (screws) or the like instead of the double-sided tape 30.
<他の実施形態>
 本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。
<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
 (1)上記実施形態では、矩形状の導光板における4つの端面のうち、1つ又は2つの端面に対向するように光源ユニットを配置していたが、他の実施形態においては、更に、他の(残りの)端面に対向するように光源ユニットを配置してもよい。 (1) In the above embodiment, the light source unit is disposed so as to face one or two of the four end surfaces of the rectangular light guide plate. However, in other embodiments, other The light source unit may be arranged so as to face the (remaining) end surface of the light source.
 (2)上記実施形態では、光源ユニットとして、複数個のLEDを実装したLED基板を用いていたが、他の実施形態においては、例えば、冷陰極蛍光ランプ(CCFL)等を光源として利用したものを適用してもよい。 (2) In the above embodiment, an LED substrate on which a plurality of LEDs are mounted is used as the light source unit. However, in other embodiments, for example, a cold cathode fluorescent lamp (CCFL) or the like is used as the light source. May be applied.
 (3)上記実施形態では、導光板と、下敷板との間に、反射シートを介在させていたが、他の実施形態においては、反射シートを取り除いて、導光板を、直接、下敷板の表側に配置してもよい。 (3) In the above embodiment, the reflection sheet is interposed between the light guide plate and the underlay plate. However, in other embodiments, the reflection sheet is removed and the light guide plate is directly attached to the underlay plate. It may be arranged on the front side.
 (4)上記実施形態では、支持部が嵌められる導光板の凹部は、導光板の端部が部分的に切り欠かれたものによって形成されていたが、他の実施形態においては、例えば、導光板を厚み方向に貫通する孔から形成されてもよい。 (4) In the above embodiment, the concave portion of the light guide plate in which the support portion is fitted is formed by partially cutting off the end portion of the light guide plate. You may form from the hole which penetrates an optical plate in the thickness direction.
 (5)上記実施形態では、導光板の厚みを、下敷板の厚みよりも大きく(厚く)設定したが、他の実施形態においては、導光板の厚みと下敷板の厚みを同じに設定してもよいし、導光板の厚みよりも、下敷板の厚みを大きく(厚く)設定してもよい。 (5) In the above embodiment, the thickness of the light guide plate is set larger (thicker) than the thickness of the underlay plate. However, in other embodiments, the thickness of the light guide plate and the thickness of the underlay plate are set to be the same. Alternatively, the thickness of the base plate may be set larger (thicker) than the thickness of the light guide plate.
 (6)上記実施形態では、液晶表示装置のスイッチング素子としてTFTを用いたが、TFT以外のスイッチング素子(例えば薄膜ダイオード)を用いた液晶表示装置にも適用可能である。 (6) Although the TFT is used as the switching element of the liquid crystal display device in the above embodiment, the present invention can also be applied to a liquid crystal display device using a switching element other than the TFT (for example, a thin film diode).
 (7)上記実施形態では、カラー表示する液晶表示装置であったが、白黒表示する液晶表示装置にも本発明は適用可能である。 (7) In the above embodiment, the liquid crystal display device performs color display, but the present invention can also be applied to a liquid crystal display device that performs black and white display.
 (8)上記実施形態では、表示パネルとして液晶パネルを用いた液晶表示装置を例示したが、他の種類の表示パネルを用いた表示装置にも本発明は適用可能である。 (8) In the above embodiment, a liquid crystal display device using a liquid crystal panel as the display panel has been illustrated, but the present invention is also applicable to a display device using another type of display panel.
 (9)上記実施形態では、チューナーを備えたテレビ受信装置を例示したが、チューナーを備えていない表示装置にも本発明は適用可能である。 (9) In the above embodiment, the television receiver provided with the tuner is exemplified, but the present invention is also applicable to a display device not provided with the tuner.
10…液晶表示装置(表示装置)、11…液晶パネル(表示パネル)、12…照明装置、13…ベゼル、14…シャーシ、14a…床、14b,14c,14d,14d…壁、15…光学部材、16…フレーム、17…光源ユニット、17a…LED、17b…LED基板、18…導光板、19…反射シート、20…下敷板、21…端部(取付部) DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12 ... Illuminating device, 13 ... Bezel, 14 ... Chassis, 14a ... Floor, 14b, 14c, 14d, 14d ... Wall, 15 ... Optical member , 16 ... Frame, 17 ... Light source unit, 17a ... LED, 17b ... LED substrate, 18 ... Light guide plate, 19 ... Reflective sheet, 20 ... Underlay plate, 21 ... End (attachment part)

Claims (9)

  1.  光源を備える光源ユニットと、
     端面が前記光源ユニットと間隔を隔てて対向するように配される導光板と、
     前記導光板の裏面側に配されるとともに、前記光源ユニットが取り付けられる取付部を備え、前記導光板と同材質にて構成される下敷板と、
     前記下敷板の板面と対向する床と、前記床に立設され、前記下敷板及び前記導光板を支持する支持部と、を有するシャーシと、を備えることを特徴とする照明装置。
    A light source unit comprising a light source;
    A light guide plate disposed such that an end face thereof is opposed to the light source unit with a gap therebetween,
    An underlay plate that is arranged on the back surface side of the light guide plate, includes an attachment portion to which the light source unit is attached, and is made of the same material as the light guide plate;
    An illuminating device comprising: a chassis facing a plate surface of the underlay plate; and a chassis standing on the floor and having a support portion supporting the underlay plate and the light guide plate.
  2.  前記取付部が、前記導光板よりも平面視外側に位置する端部にある請求項1に記載の照明装置。 The illuminating device according to claim 1, wherein the attachment portion is located at an end portion located on the outer side in plan view than the light guide plate.
  3.  前記下敷板が、前記導光板よりも長い請求項1又は請求項2に記載の照明装置。 The lighting device according to claim 1 or 2, wherein the base plate is longer than the light guide plate.
  4.  前記導光板と、前記下敷板とが共にアクリル樹脂からなる請求項3に記載の照明装置。 The lighting device according to claim 3, wherein both the light guide plate and the base plate are made of acrylic resin.
  5.  前記光源ユニットが、複数個の発光素子が実装された発光基板からなり、前記発光基板が前記下敷板に取り付けられている請求項1ないし請求項4のいずれか一項に記載の照明装置。 The lighting device according to any one of claims 1 to 4, wherein the light source unit includes a light emitting substrate on which a plurality of light emitting elements are mounted, and the light emitting substrate is attached to the base plate.
  6.  前記導光板と前記下敷板との間に反射シートが介在される請求項1ないし請求項5のいずれか一項に記載の照明装置。 The lighting device according to any one of claims 1 to 5, wherein a reflective sheet is interposed between the light guide plate and the base plate.
  7.  請求項1ないし請求項6のいずれか一項に記載の照明装置と、前記照明装置からの光を利用して表示を行う表示パネルとを備える表示装置。 A display device comprising: the illumination device according to any one of claims 1 to 6; and a display panel that performs display using light from the illumination device.
  8.  前記表示パネルは、一対の基板間に液晶を封入してなる液晶パネルからなる請求項7に記載の表示装置。 The display device according to claim 7, wherein the display panel comprises a liquid crystal panel in which liquid crystal is sealed between a pair of substrates.
  9.  請求項7または請求項8に記載された表示装置を備えるテレビ受信装置。 A television receiver comprising the display device according to claim 7 or 8.
PCT/JP2011/077766 2010-12-07 2011-12-01 Illumination device, display device and television receiving device WO2012077562A1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014017389A1 (en) * 2012-07-26 2014-01-30 シャープ株式会社 Display device and television reception device
CN106371249A (en) * 2016-11-29 2017-02-01 青岛海信电器股份有限公司 Straight down type backlight module and liquid crystal display device
CN108020957A (en) * 2016-10-31 2018-05-11 乐金显示有限公司 Display device
JP2020144283A (en) * 2019-03-07 2020-09-10 オムロン株式会社 Light emitting device and lighting fixture for vehicle

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007163620A (en) * 2005-12-12 2007-06-28 Hitachi Displays Ltd Liquid crystal display device and backlight device
JP2008147140A (en) * 2006-12-13 2008-06-26 Nichia Chem Ind Ltd Backlight unit and its manufacturing method
JP2008171797A (en) * 2006-12-13 2008-07-24 Nichia Chem Ind Ltd Backlight unit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007163620A (en) * 2005-12-12 2007-06-28 Hitachi Displays Ltd Liquid crystal display device and backlight device
JP2008147140A (en) * 2006-12-13 2008-06-26 Nichia Chem Ind Ltd Backlight unit and its manufacturing method
JP2008171797A (en) * 2006-12-13 2008-07-24 Nichia Chem Ind Ltd Backlight unit

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014017389A1 (en) * 2012-07-26 2014-01-30 シャープ株式会社 Display device and television reception device
CN108020957A (en) * 2016-10-31 2018-05-11 乐金显示有限公司 Display device
EP3324234A3 (en) * 2016-10-31 2018-11-21 LG Display Co., Ltd. Backlight of a display device
US10324329B2 (en) 2016-10-31 2019-06-18 Lg Display Co., Ltd. Display device
EP3534207A1 (en) 2016-10-31 2019-09-04 LG Display Co., Ltd. Display device
CN108020957B (en) * 2016-10-31 2020-11-03 乐金显示有限公司 Display device
CN106371249A (en) * 2016-11-29 2017-02-01 青岛海信电器股份有限公司 Straight down type backlight module and liquid crystal display device
CN106371249B (en) * 2016-11-29 2019-11-08 青岛海信电器股份有限公司 A kind of down straight aphototropism mode set and liquid crystal display device
JP2020144283A (en) * 2019-03-07 2020-09-10 オムロン株式会社 Light emitting device and lighting fixture for vehicle
JP7099371B2 (en) 2019-03-07 2022-07-12 オムロン株式会社 Light emitting device and vehicle lighting equipment

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