WO2010058625A1 - Dispositif d’illumination, dispositif d’affichage et dispositif de réception de télévision - Google Patents

Dispositif d’illumination, dispositif d’affichage et dispositif de réception de télévision Download PDF

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Publication number
WO2010058625A1
WO2010058625A1 PCT/JP2009/063165 JP2009063165W WO2010058625A1 WO 2010058625 A1 WO2010058625 A1 WO 2010058625A1 JP 2009063165 W JP2009063165 W JP 2009063165W WO 2010058625 A1 WO2010058625 A1 WO 2010058625A1
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WO
WIPO (PCT)
Prior art keywords
light
light emitting
emitting surface
led
incident
Prior art date
Application number
PCT/JP2009/063165
Other languages
English (en)
Japanese (ja)
Inventor
敬治 清水
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
Priority to US13/125,576 priority Critical patent/US8506148B2/en
Priority to CN2009801463262A priority patent/CN102216672A/zh
Publication of WO2010058625A1 publication Critical patent/WO2010058625A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0078—Side-by-side arrangements, e.g. for large area displays
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • the present invention relates to a lighting device, a display device, and a television receiver.
  • the direct type backlight device is configured such that a light source is disposed directly under a light guide plate, and a light incident surface and a light output surface of the light guide plate are parallel to each other.
  • the luminance distribution within the light emitting surface of the light guide plate has a problem that a region near the light source tends to be locally high and uneven luminance tends to occur. In order to avoid this, it is necessary to increase the distance between the light source and the light guide plate, which causes a problem that the liquid crystal display device becomes thick as a whole.
  • a light source is arranged at the side end portion of the light guide plate and the light incident surface and the light output surface of the light guide plate are orthogonal to each other. It is suitable for thinning the device.
  • the light that has entered the light guide plate does not directly exit from the light exit surface, but is emitted after being launched by the reflection sheet installed on the opposite side of the light exit surface of the light guide plate. There is a problem that the efficiency is not good and the overall luminance tends to be low.
  • the present invention has been completed based on the above-described circumstances, and an object thereof is to obtain a high luminance while suppressing luminance unevenness and to realize a reduction in thickness.
  • An illuminating device of the present invention includes a light source having a light emitting surface, a light incident surface arranged to face the light emitting surface and receiving light from the light emitting surface, and a light emitting surface for emitting light.
  • the light emitting surface has a first light emitting surface along the light emitting surface and a second light emitting surface intersecting the first light emitting surface, whereas the light incident surface is , A first light incident surface facing the first light emitting surface and along the light emitting surface, and a second light incident facing the second light emitting surface and intersecting the first light incident surface And having a surface.
  • the first light emitting surface and the first light incident surface are configured along the light emitting surface, the light emitted from the first light emitting surface and incident on the first light incident surface is directly light.
  • the light is emitted from the emission surface.
  • the second light emitting surface and the second light incident surface are surfaces intersecting the first light emitting surface and the first light incident surface along the light emitting surface.
  • the light emitted from the light incident on the second light incident surface is more extensive in the direction along the light emitting surface in the light guide. It is easy to spread. As a result, it is difficult for the brightness distribution in the light exit surface to be biased, and the thickness can be reduced.
  • the first light incident surface is provided with an incident surface scattering structure that allows the light from the light source to be incident while being scattered. In this way, since the light from the light source can be incident on the first light incident surface while being scattered, the light incident on the first light incident surface is diffused in the direction along the light exit surface. be able to. This is suitable for suppressing luminance unevenness.
  • the incident surface scattering structure includes a large number of microscopic concave portions or convex portions.
  • microscopic means that it is difficult to recognize a specific shape only by looking at the outer shape, and that the specific shape can be finally recognized using a magnifying glass or a microscope.
  • the incident surface scattering structure includes a diffusion layer in which a diffusion material is dispersed. If it does in this way, the light from a light source can be favorably diffused with the diffusion material disperse
  • the light exit surface is provided with an exit surface scattering structure for scattering emitted light. If it does in this way, it will become suitable for suppression of a brightness nonuniformity by scattering the light radiate
  • the exit surface scattering structure includes a large number of microscopic concave portions or convex portions.
  • microscopic means that it is difficult to recognize a specific shape only by looking at the outer shape, and that the specific shape can be finally recognized using a magnifying glass or a microscope.
  • the exit surface scattering structure is formed such that the degree of light scattering is gradually and gradually increased in the direction away from the light source with respect to the direction along the light exit surface.
  • the amount of light in the light guide is relatively larger on the side closer to the light source than on the far side in the direction along the light exit surface. Therefore, with respect to the degree of light scattering in the exit surface scattering structure, the side closer to the light source with a large amount of light is relatively lowered to suppress the light emission, while the side far from the light source with a small amount of light is relatively increased to increase the light output.
  • the luminance distribution in the surface of the light emitted from the light emitting surface can be made uniform. Therefore, it is more suitable for suppressing luminance unevenness.
  • the first light emitting surface is provided with a light emitting surface scattering structure for scattering emitted light.
  • a light emitting surface scattering structure for scattering emitted light.
  • the light emitting surface scattering structure is constituted by a diffusion layer in which a diffusion material is dispersed. If it does in this way, the light from a light source can be favorably diffused with the diffusion material disperse
  • a reflecting member that reflects light toward the light emitting surface is provided on the surface of the light guide opposite to the light emitting surface. In this way, light mainly incident on the second light incident surface can be efficiently guided to the light emitting surface, which is suitable for improving the luminance.
  • a reflection surface scattering structure for scattering light is provided on an installation surface of the reflection member in the light guide. If it does in this way, since the light from the installation surface of the reflection member in a light guide can be reflected by the reflection member to the light-projection surface side in the scattered state, it becomes suitable for suppression of a brightness nonuniformity.
  • the reflective surface scattering structure includes a large number of microscopic concave portions or convex portions. In this way, light emitted from the installation surface can be favorably scattered by a large number of microscopic concave portions or convex portions.
  • microscopic means that it is difficult to recognize a specific shape only by looking at the outer shape, and that the specific shape can be finally recognized using a magnifying glass or a microscope.
  • the reflection surface scattering structure is formed such that the degree of light scattering is gradually and gradually increased in the direction away from the light source with respect to the direction along the light emitting surface.
  • the amount of light in the light guide is relatively larger on the side closer to the light source than on the far side in the direction along the light exit surface. Accordingly, with respect to the degree of light scattering in the reflecting surface scattering structure, the side near the light source with a large amount of light is relatively lowered to reduce the light reflected by the reflecting member, while the side far from the light source with a small amount of light is relatively
  • the in-plane distribution of the amount of light reflected by the reflecting member can be made uniform. Therefore, it is more suitable for suppressing luminance unevenness.
  • the light guide is provided with a light source housing recess for housing the light source, and the inner surface of the light source housing recess is provided with the first light incident surface and the second light incident surface. It has been. In this way, since the light source is accommodated in the light source accommodating recess in the light guide, the overall thickness can be reduced.
  • the second light emitting surface and the second light incident surface are formed to be orthogonal to the light emitting surface. In this way, the light emitted from the second light emitting surface and incident on the second light incident surface can be spread over a wider range in the direction along the light emitting surface, which is preferable for suppressing luminance unevenness. .
  • the light source is a light emitting diode. In this way, it is possible to increase the brightness.
  • the light-emitting diode has a pair of the second light-emitting surfaces facing in opposite directions with respect to the direction along the light-emitting surface, and is approximately at the center of the light guide in the direction along the light-emitting surface. It is arranged. In this way, since light is emitted from the pair of second light emitting surfaces to the opposite sides, the emitted light amount is less likely to be biased, which is more suitable for suppressing luminance unevenness.
  • the light emitting diode has a light shielding portion on a surface opposite to the second light emitting surface in a direction along the light emitting surface, and an end portion of the light guide in a direction along the light emitting surface. It is arranged in. In this way, it is possible to manufacture the light emitting diode at a lower cost than when a pair of the second light emitting surfaces are provided so as to face opposite sides in the direction along the light emitting surface.
  • a plurality of the light guides are arranged in parallel in a direction along the light emitting surface, and a low refractive index layer having a lower refractive index than the light guide is provided between the adjacent light guides. Is intervening. If it does in this way, the light in a light guide can be totally reflected in the boundary surface with the low-refractive-index layer in a light guide. Therefore, it is possible to prevent the light inside each other from being mixed with each other between the adjacent light guides, and thus it is possible to independently control whether or not the light is emitted from the light exit surface of each light guide. Further, the size can be increased in the direction along the light exit surface.
  • the light guides are two-dimensionally arranged in parallel. In this way, it is possible to further increase the size in the direction along the light exit surface.
  • the low refractive index layer is an air layer. This eliminates the need for a special member for forming the low refractive index layer, and thus can cope with low cost.
  • a display device of the present invention includes the above-described illumination device and a display panel that performs display using light from the illumination device.
  • the illumination device that supplies light to the display panel is less likely to cause luminance unevenness and can be reduced in thickness, so that display with excellent display quality can be realized.
  • the thickness can be reduced.
  • a liquid crystal panel can be exemplified as the display panel.
  • Such a display device can be applied as a liquid crystal display device to various uses such as a display of a television or a personal computer, and is particularly suitable for a large screen.
  • the invention's effect According to the present invention, it is possible to obtain high luminance while suppressing luminance unevenness and to realize thinning.
  • FIG. 1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention.
  • Exploded perspective view showing schematic configuration of liquid crystal panel and backlight device Sectional drawing which shows the state which cut
  • the top view which shows the arrangement state of LED and a light-guide plate
  • Sectional drawing which shows the state which cut
  • Sectional drawing which shows the state which cut
  • Sectional drawing which shows the state which cut
  • SYMBOLS 10 Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12 ... Backlight device (illumination device), 16 ... LED (light source, light emitting diode), 16ab ... Side part (light-shielding part), 16d ... 1st light emission surface, 16e ... 2nd light emission surface, 18 ... Light guide plate (light guide), 18a ... LED accommodation recessed part (light source accommodation recessed part), 18b ... 1st light incident surface, 18c ... 2nd light Incident surface, 18d ... light exit surface, 18f ... installation surface, 22 ... reflective sheet (reflective member), 23 ... reflective surface scattering structure, 23a ...
  • FIGS. 1 A first embodiment of the present invention will be described with reference to FIGS.
  • the liquid crystal display device 10 is illustrated.
  • a part of each drawing shows an X axis, a Y axis, and a Z axis, and each axis direction is drawn to be a direction shown in each drawing.
  • the upper side shown in FIG.2 and FIG.3 be a front side, and let the lower side of the figure be a back side.
  • the television receiver TV includes a liquid crystal display device 10 (display device), front and back cabinets Ca and Cb that are accommodated so as to sandwich the liquid crystal display device 10, and a power source P.
  • a tuner T is provided, and the display surface 11a is supported by the stand S along the vertical direction (Y-axis direction).
  • the liquid crystal display device 10 has a horizontally long rectangular shape as a whole, and includes a liquid crystal panel 11 as a display panel and a backlight device 12 (illumination device) as an external light source, as shown in FIG. It is integrally held by a bezel 13 or the like having a shape.
  • the display surface 11a is along the vertical direction” is not limited to an aspect in which the display surface 11a is parallel to the vertical direction, and the display surface 11a is installed in a direction along the vertical direction relative to the direction along the horizontal direction.
  • it is meant to include those inclined at 0 ° to 45 °, preferably 0 ° to 30 ° with respect to the vertical direction.
  • the liquid crystal panel 11 and the backlight device 12 constituting the liquid crystal display device 10 will be described sequentially.
  • the liquid crystal panel (display panel) 11 has a rectangular shape in plan view, and a pair of glass substrates are bonded together with a predetermined gap therebetween, and liquid crystal is sealed between the glass substrates. It is said.
  • One glass substrate is provided with a switching element (for example, TFT) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, and the like.
  • the substrate is provided with a color filter and counter electrodes in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement, and an alignment film.
  • a polarizing plate is disposed on the outside of both substrates.
  • the backlight device 12 roughly includes a chassis 14 having a substantially box shape opened on the front side (the liquid crystal panel 11 side, the light emitting side), and an opening of the chassis 14.
  • An optical member 15 disposed, an LED 16 (Light Emitting Diode) as a light source disposed in the chassis 14, an LED substrate 17 on which the LED 16 is mounted, and light emitted from the LED 16 to the optical member 15.
  • a light guide plate 18 for guiding.
  • the backlight device 12 is generated in association with the light emission of the LED 16, the receiving member 19 that receives the diffusion plates 15 a and 15 b constituting the optical member 15 from the back side, the pressing member 20 that presses the diffusion plates 15 a and 15 b from the front side. And a heat dissipating member 21 for promoting heat dissipation.
  • the chassis 14 is made of metal and has a rectangular bottom plate 14a similar to the liquid crystal panel 11, a side plate 14b rising from the outer end of each side of the bottom plate 14a, and a receptacle projecting outward from the rising end of each side plate 14b. It consists of the board 14c, and has comprised the shallow substantially box shape (substantially shallow dish shape) opened toward the front side as a whole.
  • the long side direction of the chassis 14 coincides with the horizontal direction (X-axis direction), and the short side direction coincides with the vertical direction (Y-axis direction).
  • a receiving member 19 and a pressing member 20 can be placed on each receiving plate 14c in the chassis 14 from the front side.
  • the bezel 13, the receiving member 19, and the pressing member 20 can be screwed to each receiving plate 14c.
  • the bottom plate 14a is provided with a mounting structure (not shown) for mounting the LED substrate 17 and the light guide plate 18.
  • the attachment structure is a screw hole for fastening the screw member or a screw insertion hole for inserting the screw member.
  • the optical member 15 is interposed between the liquid crystal panel 11 and the light guide plate 18 and includes diffusion plates 15a and 15b arranged on the light guide plate 18 side and an optical sheet 15c arranged on the liquid crystal panel 11 side. Is done.
  • the diffusing plates 15a and 15b have a configuration in which a large number of diffusing particles are dispersed in a transparent resin base material having a predetermined thickness, and have a function of diffusing transmitted light.
  • Two diffuser plates 15a and 15b having the same thickness are stacked and arranged.
  • the optical sheet 15c has a sheet shape that is thinner than the diffusion plates 15a and 15b, and three optical sheets are laminated. Specifically, the optical sheet 15c is a diffusion sheet, a lens sheet, and a reflective polarizing sheet in order from the diffusion plates 15a and 15b side (back side).
  • Both the receiving member 19 and the pressing member 20 have a frame shape along the outer peripheral edge of the liquid crystal panel 11 and the optical member 15.
  • the receiving member 19 is directly placed on the receiving plate 14 c in the chassis 14, and can receive the outer peripheral edge of the diffusion plate 15 b on the back side of the optical member 15 from the back side.
  • the pressing member 20 is placed on the receiving member 19 and can hold the front diffusion plate 15a of the optical member 15 from the front side. Accordingly, the two diffusion plates 15 a and 15 b can be sandwiched between the receiving member 19 and the pressing member 20.
  • the pressing member 20 can receive the outer peripheral edge of the liquid crystal panel 11 from the back side, and can hold the liquid crystal panel 11 between the bezel 13 that presses the outer peripheral edge of the liquid crystal panel 11 from the front side.
  • the bezel 13 is formed in a frame shape so as to surround the display area of the liquid crystal panel 11, similarly to the receiving member 19 and the pressing member 20.
  • the heat dissipating member 21 is made of a synthetic resin material or a metal material excellent in thermal conductivity and has a sheet shape, and extends along the inner surface of the bottom plate 14a of the chassis 14.
  • the heat dissipation member 21 is disposed between the bottom plate 14 a of the chassis 14 and the LED substrate 18.
  • the LED substrate 17 is made of a synthetic resin having a white surface with excellent light reflectivity.
  • the LED substrate 17 extends along the bottom plate 14 a of the chassis 14 and is placed on the heat radiating member 21.
  • a wiring pattern made of a metal film is formed on the LED substrate 17 and the LED 16 is mounted at a predetermined position.
  • An external control board (not shown) is connected to the LED board 17, and power necessary for lighting the LED 16 is supplied from the LED board 17, and drive control of the LED 16 is possible.
  • the LED board 17 is also provided with an attachment structure (not shown) for the chassis 14. For example, when the LED board 17 is attached by a screw member, a screw hole for tightening the screw member or a screw insertion hole for passing the screw member is provided as the attachment structure. .
  • Such a mounting structure is also provided in the light guide plate 18 described below, and redundant description will be omitted.
  • the LED 16 and the light guide plate 18 As shown in FIGS. 2 and 3, the LED 16 and the light guide plate 18 form a unit light emitter in a one-to-one correspondence group, and there are a large number of unit light emitters.
  • the two-dimensionally parallel arrangement (planar arrangement) is performed along the (Y-axis direction).
  • the LED 16 is a so-called surface mount type that is surface-mounted on the LED substrate 17, and has a grid pattern (in a matrix) in the X-axis direction and the Y-axis direction on the front side surface of the LED substrate 17. ) Many are arranged in parallel.
  • the light guide plate 18 is disposed between the LED substrate 17 and the diffusion plate 15b on the back side of the optical member 15, and has a position corresponding to each LED 16 in the X-axis direction and the Y-axis direction, that is, in a grid pattern. Many are arranged in parallel (in a matrix, in a tile).
  • the arrangement pitch (arrangement interval) of the LEDs 16 on the LED substrate 17 is substantially the same as the arrangement pitch of the light guide plates 18.
  • the light guide plates 18 do not overlap each other in a plan view with respect to the light guide plates 18 adjacent to each other in the X-axis direction and the Y-axis direction, and are arranged with a predetermined interval (gap, clearance) therebetween. Has an air layer AR. Then, the separate structure of LED16 and the light-guide plate 18 is demonstrated.
  • the LED 16 has a substantially block shape as a whole and a rectangular shape in plan view.
  • the long side direction coincides with the X-axis direction and the short side direction coincides with the Y-axis direction. It is arranged in the state.
  • the LED 16 includes a substrate portion 16a fixed to the LED substrate 17, an LED chip 16b mounted on the substrate portion 16a, and a resin material 16c for sealing the LED chip 16b. Yes.
  • the back surface of the substrate portion 16 a is soldered to the land on the LED substrate 17.
  • each LED chip 16b emits monochromatic light of R (red), G (green), and B (blue). It has become.
  • the resin material 16c is for fixing the LED chip 16b on the board
  • the LED 16 has two types of light emitting surfaces 16d and 16e that emit light in different directions, which are a first light emitting surface 16d and a second light emitting surface 16e, respectively.
  • the first light emitting surface 16d is formed on the front surface of the LED 16, that is, the surface facing the light guide plate 18 in the Z-axis direction, and substantially parallel to the X-axis direction and the Y-axis direction.
  • the light guide plate 18 is set along a light exit surface 18d of the light guide plate 18 described later.
  • the second light emitting surface 16e is formed on each side surface on the short side of the LED 16, that is, a pair of surfaces facing the light guide plate 18 in the X axis direction, and extends along the Y axis direction and the Z axis direction.
  • the first light emitting surface 16d and the light emitting surface 18d described later are substantially orthogonal (intersect).
  • the pair of second light emitting surfaces 16e face opposite sides with respect to the X-axis direction, that is, directions different by 180 degrees.
  • the LED 16 according to this embodiment is a three-surface light emitting type in which three different surfaces emit light.
  • the LED 16 has two types of optical axes LA1 and LA2 that are orthogonal to each other for each of the light emitting surfaces 16d and 16e, and each of the optical axes LA1 and LA2 substantially coincides with the normal direction to the light emitting surfaces 16d and 16e. ing. Accordingly, the first optical axis LA1 in the first light emitting surface 16d is substantially coincident with the Z-axis direction, while the second optical axis LA2 in the second light emitting surface 16e is substantially in the X-axis direction. These coincide with each other and are orthogonal to the first optical axis LA1. Each second optical axis LA2 in the pair of second light emitting surfaces 16e is in a straight line.
  • the light emitted from the light emitting surfaces 16d and 16e of the LED 16 spreads radially to some extent within a predetermined angle range around the optical axes LA1 and LA2, but its directivity is a cold cathode. It is higher than tubes. That is, the light emission intensity of the LED 16 shows an angular distribution in which the direction along each of the optical axes LA1 and LA2 is high and decreases as the tilt angle with respect to the optical axes LA1 and LA2 increases. Therefore, most of the light emitted from the first light emitting surface 16d is directed to the front side along the Z-axis direction, whereas most of the light emitted from both the second light emitting surfaces 16e is approximately. It goes to both sides 180 degrees different along the X-axis direction (horizontal direction in the liquid crystal display device 10).
  • the light guide plate 18 is made of a synthetic resin material (for example, polycarbonate) having a refractive index sufficiently higher than that of air and substantially transparent (excellent translucency). As shown in FIGS. 4 and 5, the light guide plate 18 has a plate shape as a whole and a rectangular shape in plan view. The long side direction coincides with the X-axis direction, and the short side direction coincides with the Y-axis direction. It is arranged in a state of letting. As shown in FIG. 5, the light guide plate 18 is interposed between the LED substrate 17 and the diffusion plate 15 b and is attached to the LED substrate 17. The LED 16 mounted on the LED substrate 17 is attached to the light guide plate 18. Covered from the front.
  • a synthetic resin material for example, polycarbonate
  • the LED 16 is disposed at a position directly below the light guide plate 18.
  • An LED housing recess 18 a capable of housing the LEDs 16 is formed on the back surface of the light guide plate 18, that is, the surface facing the LED substrate 17.
  • the LED housing recess 18 a is disposed at a substantially central position in the X-axis direction and the Y-axis direction of the light guide plate 18, and each dimension is set larger than each dimension of the LED 16. Therefore, in the accommodated state, the LED 16 is arranged at a substantially central position in the light guide plate 18 and a predetermined gap is provided between the inner surface of the LED accommodating recess 18 a facing each other and the outer surface of the LED 16.
  • a light emitting surface 18d for emitting the light in the light guide plate 18 is provided on the front side surface of the light guide plate 18, that is, the surface facing the diffusion plate 15b.
  • the light exit surface 18d is configured along the X-axis direction and the Y-axis direction, and is a macroscopically straight surface.
  • each side end face 18e (boundary surface with the air layer AR) facing the adjacent light guide plates 18 with a gap is macroscopically or microscopically Z axis.
  • the surface is almost straight along the direction. Therefore, the light in the light guide plate 18 is hardly diffused at the side end surfaces 18e, which are the boundary surfaces with the external air layer AR, so that the incident angle with respect to the side end surfaces 18e is small.
  • the total reflection almost exceeds the critical angle, and hardly leaks from the side end face 18e to the air layer AR.
  • “macroscopic” means that a specific shape can be easily recognized by looking at the outer shape
  • “microscopic” means only by looking at the outer shape. It is difficult to recognize a specific shape, and the extent to which a specific shape can be finally recognized using a magnifying glass or a microscope is shown.
  • Two types of light incident surfaces 18b and 18c are prepared corresponding to the respective light emitting surfaces 16d and 16e, and the first light incident surface 18b facing the first light emitting surface 16d and the second light emitting surface 16e. And a second light incident surface 18c facing the surface.
  • the first light incident surface 18b is formed on the back surface of the LED housing recess 18a, that is, the surface facing the LED 16 in the Z-axis direction, and substantially along the X-axis direction and the Y-axis direction. It is set as a parallel form, and is substantially parallel to the first light emitting surface 16d and the light emitting surface 18d.
  • the alignment direction of the first light incident surface 18b and the first light emitting surface 16d coincides with the first optical axis LA1 (Z-axis direction) on the first light emitting surface 16d, and with respect to the light emitting surface 18d. Orthogonal.
  • the second light incident surfaces 18c are formed on the pair of side surfaces on the short side of the LED receiving recess 18a, that is, the pair of surfaces facing the LED 16 in the X-axis direction.
  • the first light emitting surface 16d and the light emitting surface 18d are substantially perpendicular to the second light emitting surface 16e and substantially perpendicular to the second light emitting surface 16e.
  • the arrangement direction of the second light incident surface 18c and the second light emitting surface 16e coincides with the second optical axis LA2 (X-axis direction) of the second light emitting surface 16e and is parallel to the light emitting surface 18d. is doing.
  • the light-scattering light is reflected on a region (hereinafter referred to as the installation surface 18f of the reflection sheet 22) excluding the LED housing recess 18a on the back surface of the light guide plate 18, that is, the surface opposite to the light emitting surface 18d.
  • a surface scattering structure 23 is provided, and a reflection sheet 22 for reflecting light toward the light exit surface 18d is attached. While the light in the light guide plate 18 is scattered by the reflection surface scattering structure 23 and the light is raised to the light emission surface 18d side by the reflection sheet 22, the light whose incident angle with respect to the light emission surface 18d does not exceed the critical angle is obtained. Thus, the light incident on the second light incident surface 18c can be indirectly emitted from the light emitting surface 18d.
  • the specific shape of the reflecting surface scattering structure 23 will be described in detail later.
  • light that is emitted from the first light emitting surface 16d and incident on the first light incident surface 18b is emitted from a region of the light emitting surface 18d that overlaps the LED 16 in a plan view (LED overlapping region).
  • the light is emitted from the second light emitting surface 16e and is incident on the second light incident surface 18c from a region other than the above, that is, a region other than the above, that is, a region that does not overlap with the LED 16 in a plan view (LED non-overlapping region).
  • the emitted light is mainly emitted (see FIG. 4).
  • the light emitted from the light emitting surfaces 16d and 16e of the LED 16 propagates through the light guide plate 18 and then is emitted from the light emitting surface 18d toward the optical member 15 and the liquid crystal panel 11.
  • the light emitted from the first light emitting surface 16d and incident on the first light incident surface 18b hardly hits the reflection sheet 22 or the side end surfaces 18e of the light guide plate 18 and directly emits light. Since the light exits from the exit surface 18d, the light utilization efficiency is high and contributes to the improvement of the overall luminance.
  • the amount of light tends to increase locally as compared with the exit light from other regions on the light exit surface 18d. For this reason, there is a risk of luminance unevenness.
  • each of the first light emitting surface 16d, the first light incident surface 18b, and the light emitting surface 18d is provided.
  • Scattering structures 24 to 26 that scatter light are provided.
  • each of the scattering structures 24 to 26 will be described in detail.
  • the first light incident surface 18b and the light exit surface 18d provided with the scattering structures 25 and 26 are macroscopically straight surfaces, but in FIG. In order to illustrate the shape, the microscopic shape is exaggerated and the same applies to the reflective surface scattering structure 23 provided on the installation surface 18 f of the reflective sheet 22.
  • the light emitting surface scattering structure 24 is provided on the first light emitting surface 16 d of the LED 16.
  • the light emitting surface scattering structure 24 is constituted by a diffusion layer 24a in which a predetermined amount of diffusion particles (diffusion material) is dispersed.
  • the diffusion layer 24a includes a base material made of a substantially transparent resin material and diffusion particles for scattering (diffusing) light, and has an overall transmittance lower than that of the resin material 16c constituting the light guide plate 18 and the LED 16. It has become. Since the light traveling from the LED chip 16b toward the first light emitting surface 16d is scattered by the diffusion particles in the diffusion layer 24a and then emitted from the first light emitting surface 16d, the directivity of the emitted light is weakened. Yes.
  • the emission intensity of the light emitted from the first light emitting surface 16d peaks in the direction along the first optical axis LA1 (Z-axis direction), but is not so great even when the tilt angle with respect to the optical axis LA1 increases.
  • the angle distribution tends not to drop rapidly.
  • An incident surface scattering structure 25 is provided on the first light incident surface 18b.
  • the incident surface scattering structure 25 is formed by a large number of microscopic incident surface convex portions 25a formed on the first light incident surface 18b by a molding die (not shown) used when the light guide plate 18 is molded with resin. Composed.
  • the incident surface convex portions 25a have a cross-sectional chevron shape (substantially triangular shape) and extend along the Y-axis direction, and are arranged in parallel in the X-axis direction.
  • the arrangement pitch of the incident surface convex portions 25a is substantially the same, and it can be said that the incident surface convex portions 25a are regularly arranged in parallel.
  • regular means having a structural periodicity.
  • the incident surface convex portion 25a When the light emitted from the first light emitting surface 16d is incident on the first light incident surface 18b, it is scattered by hitting the inclined surface of each incident surface convex portion 25a.
  • the surface direction of the surface 18d extends over a wide range.
  • a shape following the concave portion is formed by forming a number of microscopic concave portions on the molding surface of the molding die with respect to the first light incident surface 18b. There are techniques for forming a large number of microscopic incident surface convex portions 25a.
  • a light exit surface scattering structure 26 is provided on the light exit surface 18d. Similarly to the incident surface scattering structure 25, the exit surface scattering structure 26 is formed on the light exit surface 18d by a molding die for resin-molding the light guide plate 18, and has a large number of microscopic exit surface convex portions. 26a.
  • the exit surface convex portion 26a has a mountain-shaped cross section (substantially triangular cross section) and is configured to extend along the Y-axis direction, and is arranged in parallel in the X-axis direction.
  • each light emitting surface convex portion 26a is regularly formed such that the distribution density in the light emitting surface 18d is lower on the side closer to the LED 16 and higher on the side farther from the LED 16.
  • the light exiting from the light exit surface 18d is scattered by hitting the inclined surface of each exit surface convex portion 26a.
  • the degree of light scattering is such that the side closer to the LED 16 in the X-axis direction along the light exit surface 18d. It is relatively low, and the side far from the LED 16 is relatively high, and it tends to be gradually higher as it gets farther from the LED 16 and gradually lower as it gets closer to the LED 16.
  • the in-plane luminance distribution on the light emission surface 18d can be made uniform (leveled).
  • the reflection surface scattering structure 23 formed on the installation surface 18f of the reflection sheet 22 in the light guide plate 18 is also arranged in the same gradation as the emission surface scattering structure 26. That is, the reflection surface scattering structure 23 is formed on the installation surface 18f of the reflection sheet 22 by a molding die for resin-molding the light guide plate 18 in the same manner as the incident surface scattering structure 25 and the emission surface scattering structure 26.
  • a plurality of microscopic reflecting surface convex portions 23a are used.
  • the reflecting surface convex portions 23a have a mountain-shaped cross section (substantially triangular) and extend along the Y-axis direction, and are arranged in parallel in the X-axis direction.
  • each reflection surface convex part 23a is regularly formed so that the distribution density in the surface of the installation surface 18f of the reflection sheet 22 is lower as it is closer to the LED 16 and higher as it is farther from the LED 16.
  • the light traveling toward the installation surface 18f of the reflection sheet 22 in the light guide plate 18 is scattered by hitting the inclined surface of each reflection surface convex portion 23a.
  • the degree of light scattering is determined by the X axis along the installation surface 18f.
  • the direction closer to the LED 16 with respect to the direction is relatively low, and the side far from the LED 16 is relatively high, and tends to be gradually higher as the distance from the LED 16 increases, and gradually lower as the LED 16 is approached.
  • the rise of light on the light emitting surface 18d is relatively suppressed, whereas the light amount is relatively large.
  • the rise of light on the light exit surface 18d is relatively accelerated, so that the in-plane distribution of the rise amount of light on the reflection sheet 22 and the installation surface 18f is made uniform (leveling). It is possible to In addition, the clearance gap between the reflective sheet 22 and the reflective surface convex part 23a formed in the installation surface 18f is the air layer AR.
  • This embodiment has the structure as described above, and its operation will be described next.
  • the power supply of the liquid crystal display device 10 is turned on and each LED 16 is turned on, the light emitted from the light emitting surfaces 16d and 16e of the LED 16 is applied to the corresponding light incident surfaces 18b and 18c as shown in FIG.
  • the light emitted from the LED chip 16b constituting the LED 16 is a component emitted outside the LED 16 through the first light emitting surface 16d, and a component emitted outside the LED 16 through the second light emitting surface 16e. It is divided into.
  • the light traveling from the LED chip 16b toward the first light emitting surface 16d is transmitted through the diffusion layer 24a, which is the light emitting surface scattering structure 24, in the process of reaching the first light emitting surface 16d. Scattered by.
  • the light emitted from the first light emitting surface 16d has weak directivity and exhibits the highest light emission intensity in the direction along the first optical axis LA1 (Z-axis direction). Even if the tilt angle with respect to LA1 is increased, the angle distribution is such that the emission intensity gradually decreases.
  • the light incident on the first light incident surface 18b is scattered by hitting the inclined surface of each incident surface convex portion 25 a constituting the incident surface scattering structure 25.
  • the light incident from the first light incident surface 18b has weak directivity and propagates in the light guide plate 18 in a wide angle range with respect to the first optical axis LA1.
  • the light incident on the second light incident surface 18c hits the installation surface 18f of the reflection sheet 22 directly or indirectly after hitting the side end surface 18e of the light guide plate 18, but the installation surface 18f As the reflecting surface scattering structure 23, a reflecting surface convex portion 23a is provided. Therefore, the light introduced into the light guide plate 18 from the second light incident surface 18c is scattered by hitting the inclined surface of the reflecting surface convex portion 23a, and the light whose incident angle with respect to the inclined surface exceeds the critical angle at that time The light that is totally reflected and travels toward the light exit surface 18d side, and the incident angle with respect to the inclined surface does not exceed the critical angle passes through the installation surface 18f and hits the reflection sheet 22 to be raised toward the light exit surface 18d side. .
  • the degree of light scattering by the reflective surface convex portion 23a is lower as it is closer to the LED 16, and is higher as it is farther from the LED 16, so that the light rises in a region where the amount of light in the light guide plate 18 is relatively large. Is suppressed, and the start-up of light is promoted in a region where the amount of light in the light guide plate 18 is relatively small. Thereby, the in-plane distribution of the reflection sheet 22 and the installation surface 18f can be made uniform with respect to the amount of light rising from the reflection sheet 22 and its installation surface 18f toward the light emission surface 18d.
  • the light incident on the first light incident surface 18b and the second light incident surface 18c as described above is transmitted to the outside of the light guide plate 18 from the light output surface 18d after propagating through the light guide plate 18.
  • the light exit surface 18 d is provided with an exit surface convex portion 26 a as the exit surface scattering structure 26. Accordingly, the light traveling toward the light exit surface 18d is scattered by hitting the inclined surface of the exit surface convex portion 26a, and the light whose incident angle with respect to the inclined surface exceeds the critical angle is totally reflected and substantially reflected by the reflection sheet 22 side. The light whose incident angle with respect to the inclined surface does not exceed the critical angle passes through the inclined surface and is emitted to the outside.
  • the degree of light scattering by the exit surface convex portion 26a is lower as it is closer to the LED 16, and is higher as it is farther from the LED 16, so that light is emitted in a region where the amount of light in the light guide plate 18 is relatively large. It is suppressed and light emission is promoted in a region where the amount of light in the light guide plate 18 is relatively small. Thereby, the in-plane distribution on the light exit surface 18d can be made uniform with respect to the amount of light emitted from the light exit surface 18d to the outside.
  • the first light incident surface is provided with a diffusion layer 24a as the light emitting surface scattering structure 24 on the first light emitting surface 16d.
  • the incident surface convex portion 25a is provided as the incident surface scattering structure 25 in 18b
  • the outgoing surface convex portion 26a is provided as the outgoing surface scattering structure 26 in the light outgoing surface 18d
  • the light is emitted from the first light emitting surface 16d.
  • the directivity of the emitted light can be weakened, and the amount of emitted light can be made uniform in the light emitting surface 18d.
  • the luminance distribution can be made uniform while maintaining the overall luminance high.
  • the light emitted from the second light emitting surface 16e of the LED 16 is wider in the X-axis direction in the light guide plate 18 than the light emitted from the first light emitting surface 16d and entered into the light guide plate 18.
  • the luminance distribution in the light exit surface 18d can be made uniform.
  • the light incident on the second light incident surface 18c strikes the reflecting surface convex portion 23a, which is the reflecting surface scattering structure 23 provided on the installation surface 18f of the reflecting sheet 22, and therefore rises toward the light emitting surface 18d side.
  • the amount of light generated is made uniform in the plane of the reflection sheet 22 and its installation surface 18f, so that the luminance distribution in the plane of the light exit surface 18d can be made more uniform.
  • the side end surface 18e of the light guide plate 18 that is a boundary surface with the air layer AR secured between the adjacent light guide plates 18 has a scattering structure like the light exit surface 18d and the installation surface 18f of the reflection sheet 22. Since the incident angle almost exceeds the critical angle when the light in the light guide plate 18 strikes the side end face 18e, the light is totally reflected and returned to the light guide plate 18. As a result, it is possible to prevent internal light from passing and mixing between the light guide plates 18 in which a large number of the light guide plates 18 are arranged in a plane in the chassis 14, thereby ensuring optical independence in each light guide plate 18. Yes.
  • each LED 16 corresponding to each light guide plate 18 By individually controlling lighting or non-lighting of each LED 16 corresponding to each light guide plate 18, it is possible to independently control whether light is emitted from the light exit surface 18 d in each light guide plate 18. Therefore, drive control of the backlight device 12 called area active can be realized. As a result, the contrast performance that is extremely important as the display performance in the liquid crystal display device 10 can be remarkably improved.
  • the backlight device 12 is arranged so as to face the LED 16 having the light emitting surfaces 16d and 16e and the light emitting surfaces 16d and 16e and to receive light from the light emitting surfaces 16d and 16e.
  • the light incident surfaces 18b and 18c and the light guide plate 18 having the light emitting surface 18d for emitting light, and the light emitting surfaces 16d and 16e include a first light emitting surface 16d along the light emitting surface 18d and a first light emitting surface 16d.
  • the second light emitting surface 16e intersecting with the light emitting surface 16d has a light incident surface 18b, 18c opposite to the first light emitting surface 16d and the first light incident surface 18b along the light emitting surface 18d.
  • a second light incident surface 18c that faces the second light emitting surface 16e and intersects the first light incident surface 18b.
  • the first light emitting surface 16d and the first light incident surface 18b are configured along the light emitting surface 18d, the light emitted from the first light emitting surface 16d and incident on the first light incident surface 18b is The light exits directly from the light exit surface 18d. Thereby, light can be emitted with high utilization efficiency, and luminance can be improved.
  • the second light emitting surface 16e and the second light incident surface 18c are surfaces intersecting the first light emitting surface 16d and the first light incident surface 18b along the light emitting surface 18d.
  • the light emitted from the second light emitting surface 16e and incident on the second light incident surface 18c is larger in the light guide plate 18 than the light emitted from the first light emitting surface 16d and incident on the first light incident surface 18b.
  • the direction along the light exit surface 18d is likely to spread over a wide range.
  • the luminance distribution in the light exit surface 18d is less likely to be biased, and the thickness can be reduced.
  • high luminance can be obtained while reducing luminance unevenness and thinning can be realized.
  • the first light incident surface 18b is provided with an incident surface scattering structure 25 that allows the light from the LED 16 to be incident while being scattered. In this way, since the light from the LED 16 can be incident on the first light incident surface 18b while being scattered, the light incident on the first light incident surface 18b is directed along the light emitting surface 18d. Can be diffused. This is suitable for suppressing luminance unevenness.
  • the incident surface scattering structure 25 is composed of a large number of microscopic incident surface convex portions 25a. In this way, the light from the LED 16 can be favorably scattered by the large number of microscopic incident surface convex portions 25a.
  • the light exit surface 18d is provided with an exit surface scattering structure 26 that scatters the emitted light. In this way, the light emitted from the light exit surface 18d is scattered, which is suitable for suppressing luminance unevenness.
  • the exit surface scattering structure 26 is composed of a number of microscopic exit surface convex portions 26a. In this way, the light exiting from the light exit surface 18d can be favorably scattered by the large number of microscopic exit surface convex portions 26a.
  • the exit surface scattering structure 26 is formed so that the degree of light scattering is gradually and gradually increased in the direction away from the LED 16 with respect to the direction along the light exit surface 18d.
  • the amount of light in the light guide plate 18 is relatively greater on the side closer to the LED 16 than on the far side in the direction along the light exit surface 18d. Therefore, with respect to the degree of light scattering at the exit surface scattering structure 26, the side closer to the LED 16 with a large amount of light is relatively lowered to suppress the light emission, while the side far from the LED 16 with a small amount of light is relatively increased to emit light.
  • the in-plane luminance distribution of the light emitted from the light exit surface 18d can be made uniform. Therefore, it is more suitable for suppressing luminance unevenness.
  • the first light emitting surface 16d is provided with a light emitting surface scattering structure 24 that scatters emitted light.
  • the light emitted from the LED 16 can be scattered and diffused in the direction along the light exit surface 18d. This is suitable for suppressing luminance unevenness.
  • the light emitting surface scattering structure 24 is constituted by a diffusion layer 24a in which diffusion particles are dispersed. In this way, the light from the LED 16 can be diffused satisfactorily by the diffusing particles dispersed in the diffusing layer 24a.
  • a reflection sheet 22 that reflects light toward the light exit surface 18d is provided on the surface of the light guide plate 18 opposite to the light exit surface 18d. In this way, light mainly incident on the second light incident surface 18c can be efficiently guided to the light emitting surface 18d, which is suitable for improving luminance.
  • a reflection surface scattering structure 23 that scatters light is provided on the installation surface 18 f of the reflection sheet 22 in the light guide plate 18. In this way, light from the installation surface 18f of the reflection sheet 22 in the light guide plate 18 can be reflected to the light emission surface 18d side by the reflection sheet 22 in a scattered state, which is suitable for suppressing luminance unevenness. It becomes.
  • the reflecting surface scattering structure 23 is constituted by a number of microscopic reflecting surface convex portions 23a. In this way, the light emitted from the installation surface 18f can be favorably scattered by the large number of microscopic reflecting surface convex portions 23a.
  • the reflecting surface scattering structure 23 is formed so that the degree of light scattering is gradually and gradually increased in the direction away from the LED 16 with respect to the direction along the light emitting surface 18d.
  • the amount of light in the light guide plate 18 is relatively greater on the side closer to the LED 16 than on the far side in the direction along the light exit surface 18d. Therefore, with respect to the degree of light scattering in the reflecting surface scattering structure 23, the side closer to the LED 16 having a large amount of light is relatively lowered to reduce the light reflected by the reflecting sheet 22, while the side far from the LED 16 having a small amount of light is reduced.
  • the in-plane distribution of the amount of light reflected by the reflection sheet 22 can be made uniform. Therefore, it is more suitable for suppressing luminance unevenness.
  • the light guide plate 18 is provided with an LED housing recess 18a for housing the LED 16, and a first light incident surface 18b and a second light incident surface 18c are provided on the inner surface of the LED housing recess 18a. Yes. In this way, since the LED 16 is accommodated in the LED accommodating recess 18a of the light guide plate 18, the entire thickness can be reduced.
  • the second light emitting surface 16e and the second light incident surface 18c are formed so as to be orthogonal to the light emitting surface 18d. In this way, the light emitted from the second light emitting surface 16e and incident on the second light incident surface 18c can be spread over a wider range in the direction along the light emitting surface 18d. Preferred.
  • the light source is an LED 16. In this way, it is possible to increase the brightness.
  • the LED 16 has a pair of second light emitting surfaces 16e facing opposite sides in the direction along the light emitting surface 18d, and is disposed at the approximate center of the light guide plate 18 in the direction along the light emitting surface 18d. . In this way, since light is emitted from the pair of second light emitting surfaces 16e to the opposite sides, the amount of emitted light is less likely to be biased, which is preferable for suppressing luminance unevenness.
  • a plurality of light guide plates 18 are arranged in parallel in the direction along the light exit surface 18 d, and a low refractive index layer having a lower refractive index than that of the light guide plate 18 is interposed between the adjacent light guide plates 18. Yes. In this way, the light in the light guide plate 18 can be totally reflected at the interface between the light guide plate 18 and the low refractive index layer. Therefore, it is possible to prevent the light inside each other from being mixed between the adjacent light guide plates 18, so that the right and left of the light output from the light exit surface 18 d of each light guide plate 18 can be individually controlled independently. . Further, the size can be increased in the direction along the light exit surface 18d.
  • the light guide plates 18 are two-dimensionally arranged in parallel. In this way, it is possible to further increase the size in the direction along the light exit surface 18d.
  • the low refractive index layer is an air layer AR. This eliminates the need for a special member for forming the air layer AR, and thus can be dealt with at a low cost.
  • the liquid crystal display device 10 includes the above-described backlight device 12 and the liquid crystal panel 11 that performs display using light from the backlight device 12. According to such a liquid crystal display device 10, the backlight device 12 that supplies light to the liquid crystal panel 11 is less likely to cause luminance unevenness and can be thinned. It is also possible to reduce the thickness.
  • Embodiment 2 A second embodiment of the present invention will be described with reference to FIG. In this Embodiment 2, what changed the structure of LED16A and the light-guide plate 18A is shown.
  • the same parts as those in the first embodiment are denoted by the same reference numerals and suffixed with the suffix A, and redundant description of the structure, operation, and effect is omitted.
  • the LED 16 ⁇ / b> A has a structure (two-surface light emission type) in which only one second light emitting surface 16 e ⁇ / i> A is provided.
  • the board portion 16aA constituting the LED 16A has an L-shaped cross section, rises from the LED board 17A and covers the resin material 16cA from the side while extending along the LED board 17A. It is comprised from the side part 16ab. Since this board
  • the LED housing recess 18aA provided in the light guide plate 18A is the left end portion of the light guide plate 18A shown in FIG. 6, that is, the end portion on the side where the side portion 16ab is provided in the LED 16A, in other words, the second light emitting surface 16eA in the LED 16A. It is biased and arranged near the end on the opposite side.
  • the right surface shown in FIG. 6 that faces the second light emitting surface 16eA of the LED 16A is the second light incident surface 18cA.
  • the light emitted from the second light emitting surface 16eA and incident on the second light incident surface 18cA propagates in the light guide plate 18A to the right side shown in FIG.
  • the reflecting surface convex portion 23aA forming the reflecting surface scattering structure 23A and the emitting surface convex portion 26aA forming the emitting surface scattering structure 26A are both from the left end portion to the right end portion shown in FIG. 6, that is, from the LED 16A. They are arranged in a gradation so that the distribution density gradually increases and the degree of scattering increases as it goes away.
  • the LED 16A has the side 16ab having a light shielding property on the surface opposite to the second light emitting surface 16eA in the direction along the light emitting surface 18dA, and the light emitting surface. It is distribute
  • Embodiment 3 A third embodiment of the present invention will be described with reference to FIG. In this Embodiment 3, what changed the entrance plane scattering structure 25B is shown.
  • the same parts as those in the first embodiment are denoted by the same reference numerals and suffixed with a subscript B, and redundant description of the structure, operation, and effect is omitted.
  • the incident surface scattering structure 25B provided on the first light incident surface 18bB includes a diffusion layer 25b in which a predetermined amount of diffusion particles are dispersed.
  • the diffusion layer 25b has a configuration similar to that of the diffusion layer 24aB provided on the first light emitting surface 16dB, and is capable of scattering incident light by diffusion particles.
  • the incident surface scattering structure 25B is configured by the diffusion layer 25b in which diffusion particles are dispersed. In this way, the light from the LED 16B can be diffused satisfactorily by the diffusion particles dispersed in the diffusion layer 25b.
  • a fourth embodiment of the present invention will be described with reference to FIG.
  • the shape of the first light emitting surface 16dC is changed.
  • the same parts as those in the first embodiment are denoted by the same reference numerals and suffixed with a suffix C, and redundant description of the structure, operation, and effect is omitted.
  • the first light emitting surface 16dC has a substantially spherical shape and a cross-sectional shape of a substantially arc shape. In this way, light can be emitted at a wider angle from the first light emitting surface 16dC, and the directivity of light can be weakened.
  • the first light emitting surface of the LED and the first light incident surface of the light guide plate are substantially parallel to the light emitting surface, and are straight surfaces along the X-axis direction and the Y-axis direction.
  • the first light emitting surface or the first light incident surface is inclined with respect to the X-axis direction or the Y-axis direction and is not parallel to the light emitting surface. It is included in the present invention.
  • the second light emitting surface of the LED and the second light incident surface of the light guide plate are substantially orthogonal to the light emitting surface, and are straight surfaces along the Z-axis direction and the Y-axis direction.
  • the second light emitting surface or the second light incident surface is inclined with respect to the Z-axis direction or the Y-axis direction and is not orthogonal to the light emitting surface, the present invention is also included in the present invention.
  • the present invention includes a case where the second light emitting surface or the second light incident surface has a curved shape such as an arc shape.
  • the present invention includes a configuration in which three or more second light-emitting surfaces are provided. It is.
  • the LED has a square shape in plan view
  • all of the four surfaces adjacent to the first light emitting surface are used as the second light emitting surface, so that light can be emitted radially when viewed from the plane. It becomes possible.
  • the second light emitting surface is formed in a circular shape in plan view, thereby enabling radial light emission similar to the above.
  • the optical axis of the second light emitting surface of the LED coincides with the long side direction of the light guide plate.
  • the optical axis of the second light emitting surface is the short side of the light guide plate. What matched the direction is also included in the present invention.
  • the optical axis of the second light emitting surface of the LED coincides with the horizontal direction of the liquid crystal display device and the backlight device.
  • the optical axis of the second light emitting surface is the liquid crystal.
  • a display device and a backlight device that match the vertical direction are also included in the present invention.
  • the incident surface scattering structure is provided with a large number of microscopic incident surface convex portions or the diffusion layer is provided.
  • a microscopic recess is also included in the present invention.
  • microscopic concave portions or convex portions may be formed by coating fine silica powder.
  • a microscopic concave portion may be formed by performing a blast process on the first light incident surface. Regardless of which method is used, it is also possible to arrange the concave or convex portions irregularly.
  • the emission surface scattering structure and the reflection surface scattering structure are provided with a large number of microscopic convex portions.
  • the invention is also included in the present invention.
  • a microscopic recess or projection may be formed by coating fine silica powder. Also good.
  • a microscopic concave portion may be formed by performing a blasting process on the light emission surface or the installation surface of the reflection sheet. Regardless of which method is used, it is also possible to arrange the concave or convex portions irregularly.
  • the distribution density (the degree of scattering) of the microscopic convex portions provided as the exit surface scattering structure and the reflection surface scattering structure has been changed gradually and gradually.
  • a structure in which the distribution density of the visual concave portions or convex portions is sequentially changed step by step is also included in the present invention.
  • the present invention includes a microscopic concave portion or convex portion having a uniform distribution density.
  • a light emitting surface scattering structure using a diffusion layer having a structure in which diffusion particles are dispersed in a transparent base material is shown.
  • a sheet formed on a white resin material is used.
  • the sheet thickness may be reduced to such a degree that a desired transmittance (for example, lower than the transmittance of a resin material or a light guide plate constituting the LED) can be obtained.
  • the LED and the light guide plate are installed in a one-to-one relationship.
  • the present invention also includes a configuration in which a plurality of LEDs are installed corresponding to a single light guide plate. Included in the invention. In that case, the LED housing recess may be configured to accommodate a plurality of LEDs collectively or to accommodate each LED individually.
  • the reflective sheet is individually installed for each light guide plate.
  • a single reflective sheet may be installed for a plurality of light guide plates. It is included in the present invention. In that case, a reflective sheet may be arranged in a region between adjacent light guide plates.
  • an air layer is used as the low refractive index layer.
  • a low refractive index layer made of a low refractive index material is interposed in each gap in the light guide plate. are also included in the present invention.
  • the LED and the light guide plate have a rectangular shape when viewed in plan, but the LED or the light guide plate may have a square shape when viewed in plan.
  • the LED and the light guide plate are two-dimensionally arranged in parallel in the chassis.
  • the one-dimensionally parallel arrangement is also included in the present invention. include. Specifically, the LED and the light guide plate are arranged in parallel only in the vertical direction, and the LED and the light guide plate are arranged in parallel only in the horizontal direction are also included in the present invention. Further, the present invention can be applied to a case where only one set of LED and light guide plate is used.
  • an LED using three types of LED chips each emitting R, G, and B in a single color is shown. However, one type of LED chip that emits blue or purple in a single color. In the present invention, an LED using a type of LED that emits white light with a phosphor is also included.
  • the configuration of the optical member can be appropriately changed. Specifically, the number of diffusion plates and the number and type of optical sheets can be changed as appropriate. It is also possible to use a plurality of optical sheets of the same type.
  • the liquid crystal panel and the chassis are illustrated in a vertically placed state in which the short side direction coincides with the vertical direction.
  • the liquid crystal panel and the chassis have the long side direction in the vertical direction.
  • Those that are in a vertically placed state matched with are also included in the present invention.
  • a TFT is used as a switching element of a liquid crystal display device.
  • the present invention can also be applied to a liquid crystal display device using a switching element other than TFT (for example, a thin film diode (TFD)).
  • a switching element other than TFT for example, a thin film diode (TFD)
  • the present invention can also be applied to a liquid crystal display device for monochrome display.
  • liquid crystal display device using the liquid crystal panel as the display element has been exemplified, but the present invention is also applicable to a display device using another type of display element.
  • the television receiver provided with the tuner is exemplified, but the present invention can also be applied to a display device not provided with the tuner.

Abstract

L’invention concerne un dispositif de retro-éclairage (12) comprenant une diode électroluminescente (LED) (16) possédant des surfaces d’émission de lumière (16d, 16e), et une plaque de guide de lumière (18) possédant des surfaces d’incidence de lumière (18b, 18c) qui sont disposées de manière à faire face aux surfaces d’émission de lumière (16d, 16e) et sur lesquelles la lumière provenant des surfaces d’émission de lumière (16d, 16e) est incidente, et une surface de sortie de lumière (18d) pour que la lumière puisse sortir. Les surfaces d’émission de lumière (16d, 16e) comprennent une première surface d’émission de lumière (16d) s’étendant le long d’une surface de sortie de lumière (18d) et une seconde surface d’émission de lumière (16e) entrant en intersection avec la première surface d’émission de lumière (16d). Les surfaces d’incidence de lumière (18b, 18c) comprennent une première surface d’incidence de lumière (18b) faisant face à la première surface d’émission de lumière (16d) et s’étendant le long de la surface de sortie de lumière (18d), et une seconde surface d’incidence de lumière (18c) faisant face à la seconde surface d’émission de lumière (16e) et entrant en intersection avec la première surface d’incidence de lumière (18b).
PCT/JP2009/063165 2008-11-20 2009-07-23 Dispositif d’illumination, dispositif d’affichage et dispositif de réception de télévision WO2010058625A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US13/125,576 US8506148B2 (en) 2008-11-20 2009-07-23 Lighting device, display device and television receiver
CN2009801463262A CN102216672A (zh) 2008-11-20 2009-07-23 照明装置、显示装置和电视接收装置

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JP2008297086 2008-11-20
JP2008-297086 2008-11-20

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CN102216672A (zh) 2011-10-12
US8506148B2 (en) 2013-08-13
US20110194034A1 (en) 2011-08-11

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