WO2012011327A1 - Dispositif d'éclairage, dispositif d'affichage et récepteur de télévision - Google Patents

Dispositif d'éclairage, dispositif d'affichage et récepteur de télévision Download PDF

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Publication number
WO2012011327A1
WO2012011327A1 PCT/JP2011/063044 JP2011063044W WO2012011327A1 WO 2012011327 A1 WO2012011327 A1 WO 2012011327A1 JP 2011063044 W JP2011063044 W JP 2011063044W WO 2012011327 A1 WO2012011327 A1 WO 2012011327A1
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WO
WIPO (PCT)
Prior art keywords
light
light guide
guide member
led
lighting device
Prior art date
Application number
PCT/JP2011/063044
Other languages
English (en)
Japanese (ja)
Inventor
張　志芳
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 WO2012011327A1 publication Critical patent/WO2012011327A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/66—Transforming electric information into light information
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G02B6/008—Side-by-side arrangements, e.g. for large area displays of the partially overlapping type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/64—Constructional details of receivers, e.g. cabinets or dust covers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • the present invention relates to a lighting device, a display device, and a television receiver.
  • the display elements of image display devices such as television receivers are shifting from conventional cathode ray tubes to thin display panels such as liquid crystal panels and plasma display panels, which enables thinning of image display devices.
  • a backlight device is separately required as a lighting device, and the backlight device is roughly classified into a direct type and an edge light type according to the mechanism.
  • an edge light type backlight device it is preferable to use an edge light type backlight device, and an example described in Patent Document 1 below is known.
  • Patent Document 1 a plurality of light sources arranged in parallel at the end of the backlight device and a light guide plate that guides light from the light sources and emits the light toward the liquid crystal panel side.
  • the light guide plate is configured to extend along a direction orthogonal to the parallel direction of the light sources, and a plurality of light guide plates are arranged in parallel along the parallel direction of the light sources.
  • the entire light guide plate emits light, light is partially emitted in the direction orthogonal to the parallel direction of the light sources. The state could not be controlled.
  • the present invention has been completed based on the above situation, and an object thereof is to partially control the light emission state.
  • a plurality of light sources a light emitting surface that emits light incident on the end portions are arranged opposite to the light source, and opposite to the light emitting surface.
  • a plurality of light guide members positioned on the side and having a bottom surface parallel to the light output surface, wherein the light guide member includes a first light guide member and a light output to the first light guide member.
  • the light source includes at least a second light guide member arranged in a stacked manner on the side opposite to the side, whereas the light source is opposed to the end of the first light guide member.
  • the second light guide member has a support surface that supports the bottom surface of the laminated first light guide member.
  • Rutotomoni has the light emitting surface in a manner sandwiching the support surface between said second light source.
  • the light guide member includes at least the first light guide member and the second light guide member arranged in a form laminated on the side opposite to the light emitting side with respect to the first light guide member.
  • the light source includes a first light source facing the end of the first light guide member, a first light source facing the end of the second light guide member, and a first light source. Since at least a second light source disposed on the side opposite to the light emitting side with respect to the light source is included, for example, if the first light source is turned on and the second light source is not turned on, the first light guide member The light exits from the light exit surface of the second light guide member disposed at a position sandwiching the first light guide member supported by the support surface between the light source and the second light source.
  • each light source corresponding to each light guide member it is possible to selectively control the amount of light emitted from each light exit surface of each light guide member.
  • the first light source and the second light source included in the light source can be concentrated and arranged on the end side in the lighting device, the light source is temporarily distributed to the central side in the lighting device. Compared to the case where the light source is arranged, the light source can be easily installed and the wiring configuration can be simplified.
  • the second light guide member has a support surface that supports the bottom surface of the laminated first light guide member, and has a light emission surface that sandwiches the support surface with the second light source. Therefore, the first light guide member can be stably supported by the support surface, and the workability when the first light guide member is laminated on the second light guide member during manufacturing is excellent. Since it is avoided that the first light guide member is laminated on the light exit surface of the optical member, the light from the light exit surface can be emitted without passing through the first light guide member. Furthermore, since the light guide member has a parallel relationship between the light exit surface and the bottom surface, the illumination device is compared with a case where the light exit surface and the bottom surface are not parallel and the light guide member is tapered. In the manufacturing process, it is possible to obtain an effect that it is easy to distinguish between when the order of stacking the light guide members is correct and when the order of stacking is incorrect, and the strength is also excellent.
  • the support surface of the second light guide member is configured to be parallel to the bottom surface of the first light guide member. If it does in this way, the 1st light guide member can be supported more stably.
  • the light output surface of the first light guide member and the light output surface of the second light guide member have substantially the same area. This makes it easy to control the driving of the first light source and the second light source in adjusting the brightness per unit area in the emitted light from each light emitting surface.
  • the second light guide member has substantially the same dimensions as the first light guide member in the width direction when the arrangement direction of the light emitting surface and the support surface is a length direction. It is said. According to this configuration, when the first light guide member and the second light guide member are stacked, the first light guide member and the second light guide member are formed by aligning the end surfaces in the width direction. It can be laminated over the entire width. Therefore, the first light guide member and the second light guide member can be easily positioned, and the workability is excellent. Further, since the light guide surface of the second light guide member is relatively far from the light source as compared with the first light guide member, the light from the second light source is guided to the light output surface and emitted.
  • the second light source in the second light guide member is relatively inferior in terms of light use efficiency.
  • the light emitted from the light can be efficiently guided to the light exit surface, and the light utilization efficiency can be improved.
  • the light source is arranged at a central position of the light guide member in the width direction. In this way, compared to the case where the light source is arranged at an eccentric position of the light guide member in the width direction, the light can be propagated in the light guide member without deviation, and the light emitted from the light exit surface is reflected. Unevenness is less likely to occur.
  • a light incident surface on which light from the light source is incident is disposed at the end portion of the light guide member, and the first light guide member and the second light guide member are configured to emit the light.
  • the first light source and the second light source are arranged in a straight line along the light incident surface, whereas the surfaces are arranged so as to be flush with each other. If it does in this way, the space
  • a reflecting member is provided along the bottom surface of the light guide member and reflects light. If it does in this way, light can be efficiently propagated in a light guide member by reflecting the light in a light guide member with a reflection member, and light can be raised toward a light-projection surface. .
  • the reflection member disposed on the bottom surface of the first light guide member covers the support surface of the second light guide member over the entire area. If it does in this way, it can prevent that the light which propagates the inside of the 2nd light guide member laminated
  • a light incident surface on which light from the light source is incident is disposed at the end portion of the light guide member, and the reflection member is opposite to the light incident surface of the light guide member. It is supposed to cover the surface. If it does in this way, it can prevent that the light which propagates the inside of a light guide member radiate
  • the first light guide member and the second light guide member have a width direction when a direction of alignment of the light emitting surface and the support surface of the second light guide member is a length direction.
  • a plurality of first light sources and a plurality of second light sources are arranged side by side
  • a plurality of the first light sources and the second light sources are arranged side by side in the width direction.
  • a low refractive index layer having a refractive index relatively lower than that of the light guide member is interposed between the light guide members adjacent in the width direction. This makes it difficult for the light in the light guide member to be emitted to the low refractive index layer side, so that it is possible to prevent light from passing between adjacent light guide members, and the optical properties of the adjacent light guide members. Independence can be ensured. In addition, the amount of light emitted from each light guide member can be sufficiently secured, and the luminance can be improved.
  • 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.
  • the second light guide member is provided with a protruding light output portion that has the light output surface and protrudes further toward the light output side than the support surface. If it does in this way, since it is set as the form which a protrusion light-emitting part protrudes in the light-projection side rather than a support surface, it has the light-projection surface in a 1st light guide member, and the protrusion light-projection part in a 2nd light guide member It is possible to reduce or eliminate the step between the light exit surface. Thereby, for example, the stability when the other member (such as an optical member) is placed on the light exit surface is excellent, and the optical path length from when the light exits each light exit surface to the other member described above is improved. The difference can be mitigated or eliminated.
  • the protruding light exit portion of the second light guide member is formed such that the light exit surface thereof is flush with the light exit surface of the first light guide member. If it does in this way, a level difference can be eliminated between the light emission surface which the 1st light guide member has, and the light emission surface which the projection light emission part in the 2nd light guide member has. Thereby, for example, when the other member is placed on the light exit surface, the stability is extremely excellent, and the difference in the optical path length from when the light exits each light exit surface to the other member described above is eliminated. be able to.
  • a portion that overlaps with the protruding light output portion in a plan view has a gradient that rises toward the light emission side in a direction away from the second light source.
  • An inclined surface is formed.
  • the light guide surface of the second light guide member is relatively far from the light source as compared with the first light guide member, and thus the light from the second light source is guided to the light output surface.
  • an inclined surface is formed on a portion of the bottom surface that overlaps with the protruding light emitting portion having the light emitting surface, so that the internal light is emitted from the light emitting surface. It is possible to start up efficiently. Thereby, the utilization efficiency of the light in the 2nd light guide member can be improved, and it can be made hard to produce a difference in the utilization efficiency of light between the 1st light guide member.
  • a plurality of the first light sources and the second light sources are arranged. If it does in this way, the improvement of the brightness
  • a condensing member that is interposed between the light source and the light guide member and collects light from the light source and emits the light toward the light guide member is provided. If it does in this way, the light emitted from the light source can be efficiently entered with respect to the light guide member. Thereby, since the light use efficiency can be improved, it is possible to improve luminance and reduce power consumption.
  • the condensing member is provided integrally with the light source. If it does in this way, installation of a condensing member will become easy.
  • the light source is an LED. In this way, high brightness and low power consumption can be achieved.
  • 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 can partially control the light emission state, the display quality can be improved.
  • 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 light emission state is partially controlled.
  • FIG. 1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention.
  • the exploded perspective view which shows schematic structure of the liquid crystal display device with which a television receiver is equipped
  • the top view which shows the arrangement structure of the chassis in the backlight apparatus with which a liquid crystal display device is equipped, a light guide member, and an LED board (LED). Sectional view taken along line iv-iv in FIG. V-v sectional view of FIG.
  • the top view which shows the arrangement structure of the chassis in the backlight apparatus which concerns on Embodiment 2 of this invention, a light guide member, and an LED board (LED). Vii-vii sectional view of FIG.
  • Sectional drawing which shows the cross-sectional structure of the light guide member and LED board (LED) in the backlight apparatus which concerns on Embodiment 3 of this invention.
  • Sectional drawing which shows the case where a structure is changed so that an optical member may be laminated
  • the top view which shows the arrangement configuration of the chassis in the backlight apparatus which concerns on Embodiment 4 of this invention, a light guide member, and an LED board (LED).
  • Xi-xi sectional view of FIG. The top view which shows the arrangement configuration of the chassis in the backlight apparatus which concerns on Embodiment 5 of this invention, a light guide member, and an LED board (LED).
  • Xiii-xiii sectional view of FIG. Xiv-xiv sectional view of FIG.
  • 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.4 and FIG.5 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, front and back cabinets Ca and Cb that are accommodated so as to sandwich the liquid crystal display device 10, a power source P, a tuner T, And a stand S.
  • the liquid crystal display device (display device) 10 has a horizontally long (longitudinal) square shape as a whole and is accommodated in a vertically placed state.
  • the liquid crystal display device 10 includes a liquid crystal panel 11 that is a display panel and a backlight device (illumination device) 12 that is an external light source, which are integrated by a frame-like bezel 13 or the like. Is supposed to be retained.
  • the liquid crystal panel 11 has a horizontally long (longitudinal) rectangular shape in a plan view, and a pair of glass substrates are bonded together with a predetermined gap therebetween, and between the two glass substrates.
  • the liquid crystal is sealed.
  • 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 is disposed so as to cover a substantially box-shaped chassis 14 having an opening on the light emitting surface side (the liquid crystal panel 11 side), and the opening of the chassis 14.
  • Optical member 15 group diffusing plate (light diffusing member) 15a and a plurality of optical sheets 15b arranged between the diffusing plate 15a and the liquid crystal panel 11), and the optical member 15 arranged along the outer edge of the chassis 14.
  • a frame 16 that holds the outer edge of the group between the chassis 14 and the frame 16.
  • an LED (Light Emitting Diode) 17 that is a light source, an LED substrate 18 on which the LED 17 is mounted, and light from the LED 17 are guided to the optical member 15 (liquid crystal panel 11).
  • the backlight device 12 is of a so-called edge light type (side light type) in which an LED substrate 18 having LEDs 17 is arranged opposite to one end of the light guide member 19 on the long side. Yes. Below, each component of the backlight apparatus 12 is demonstrated in detail.
  • the chassis 14 is made of a metal plate material (sheet metal made of iron, aluminum, or the like). As shown in FIG. 2, the chassis 14 has a horizontally long bottom plate 14a and a long side of the bottom plate 14a. A pair of long side plates 14b rising from each outer end, a pair of short side plates 14c rising from each short side outer end of the bottom plate 14a, and a receptacle projecting inwardly from the long side plates 14b. It is comprised from the board 14d.
  • the long side direction of the chassis 14 (bottom plate 14a) coincides with the X-axis direction (horizontal direction), and the short side direction coincides with the Y-axis direction (vertical direction).
  • a frame 16 and an optical member 15 described below can be placed from the front side. A frame 16 can be screwed to each receiving plate 14d.
  • the optical member 15 has a horizontally long rectangular shape when viewed in a plane, like the liquid crystal panel 11 and the chassis 14. As shown in FIGS. 4 and 5, the optical member 15 is configured such that both outer edges on the long side are placed on both receiving plates 14 d and both outer edges on the short side are placed on both holders 21 described later. And is disposed so as to be interposed between the liquid crystal panel 11 and the light guide member 19.
  • the optical member 15 includes a diffusion plate 15a disposed on the back side (light guide member 19 side, opposite to the light emitting side) and an optical sheet 15b disposed on the front side (liquid crystal panel 11 side, light emitting side). Composed.
  • the diffusing plate 15a has a structure in which a large number of diffusing particles are dispersed in a substantially transparent resin base material having a predetermined thickness, and has a function of diffusing transmitted light.
  • the optical sheet 15b has a sheet shape that is thinner than the diffusion plate 15a, and three optical sheets are laminated. Specific types of the optical sheet 15b include, for example, a diffusion sheet, a lens sheet, a reflective polarizing sheet, and the like, which can be appropriately selected and used.
  • the frame 16 is configured to extend along the long side direction of the chassis 14, and is attached to the front side of the receiving plate 14 d in the chassis 14. An outer edge portion on the long side of the optical member 15 can be sandwiched between the frame 16 and the receiving plate 14d. Further, the frame 16 can receive the outer edge of the long side of the liquid crystal panel 11 from the back side.
  • the holder 21 is made of white synthetic resin. As shown in FIGS. 2 and 5, the holder 21 has a substantially elongated box shape extending along the short side direction of the chassis 14, and is formed on the short side of the chassis 14. It is attached to the chassis 14 in a state of being arranged along the side plate 14b.
  • the holder 21 has a stepped surface on the front surface side on which the optical member 15 and the liquid crystal panel 11 can be placed in steps, and receives the outer edge on the short side of the optical member 15 and the liquid crystal panel 11 from the back side. be able to.
  • the LED 17 has a configuration in which an LED chip 17 a is sealed with a resin material on a substrate portion fixed to the LED substrate 18.
  • the LED chip 17a mounted on the substrate unit has one kind of main light emission wavelength, and specifically, one that emits blue light in a single color is used.
  • the resin material that seals the LED chip 17a is dispersed and blended with a phosphor that emits a predetermined color when excited by blue light emitted from the LED chip 17a. It is supposed to be emitted.
  • a yellow phosphor that emits yellow light for example, a green phosphor that emits green light, and a red phosphor that emits red light are used in appropriate combination, or any one of them is used. It can be used alone.
  • the LED 17 is a so-called top type in which a surface opposite to the mounting surface with respect to the LED substrate 18 is a light emitting surface.
  • a condensing lens 22 is integrally provided on the light emitting surface side of the LED 17.
  • the condensing lens 22 is interposed between the LED 17 and the light incident surface 19b of the light guide member 19, and emits the light emitted from the LED 17 toward the light incident surface 19b while providing a condensing function. Accordingly, most of the emitted light can be efficiently incident on the light incident surface 19 b of the light guide member 19.
  • the LED substrate 18 has a plate shape made of synthetic resin (such as glass epoxy resin), and has a white surface with excellent light reflectivity. As shown in FIGS. 2 and 4, the LED substrate 18 has a plate shape extending along the long side direction (X-axis direction) of the chassis 14, and the main plate surface thereof in the X-axis direction and the Z-axis direction. It is accommodated in the chassis 14 in a parallel posture, that is, a posture orthogonal to the plate surfaces of the liquid crystal panel 11 and the optical member 15.
  • the LED substrate 18 has a length direction corresponding to the X-axis direction, a width direction corresponding to the Z-axis direction, and a plate thickness direction corresponding to the Y-axis direction.
  • the LED board 18 is arranged corresponding to one end of the long side in the chassis 14 (the lower end in FIG. 3 and the left end in FIG. 4), and is attached to the inner surface of the side plate 14b on the long side. It has been.
  • the LED 17 having the above-described configuration is surface-mounted on the main plate surface of the LED substrate 18. Since all the LEDs 17 are mounted on the LED substrate 18, the LEDs 17 are collectively arranged at the lower end of the chassis 14 shown in FIG. 3.
  • a wiring pattern (not shown) made of a metal film (copper foil or the like) is formed on the mounting surface of the LED 17 on the LED substrate 18, and terminal portions formed at the ends of the wiring pattern are not shown.
  • driving power is supplied to the LED 17.
  • the LED board 18 to the side plate 14b disposed at the end of the chassis 14, it is possible to easily secure a wiring path to the LED driving unit.
  • the detailed arrangement of the LEDs 17 on the LED substrate 18 will be described in detail later.
  • the light guide member 19 is made of a synthetic resin material (for example, acrylic) having a refractive index sufficiently higher than that of air and substantially transparent (exceeding translucency). As shown in FIGS. 2 and 3, many light guide members 19 according to the present embodiment are arranged in parallel at positions immediately below the liquid crystal panel 11 and the optical member 15 in the chassis 14. An LED substrate 18 having LEDs 17 is arranged in an opposed manner to one end (the lower end shown in FIG. 3) in the group.
  • a synthetic resin material for example, acrylic
  • the alignment direction of the LED 17 (LED substrate 18) and the light guide member 19 coincides with the Y-axis direction, whereas the alignment direction of the optical member 15 (liquid crystal panel 11) and the light guide member 19 is the Z-axis direction. And the arrangement directions of the two are orthogonal to each other.
  • the light guide member 19 introduces light emitted from the LED 17 in the Y-axis direction, and rises and emits the light toward the optical member 15 side (Z-axis direction) while propagating the light inside. It has a function.
  • four types of light guide members 19 having different sizes and the like are used.
  • the common structure of each light guide member 19 will be described first, and then each light guide member 19 is guided. The difference structure of the member 19 shall be demonstrated.
  • the light guide member 19 has a substantially flat plate shape whose main plate surface is parallel to the optical member 15 and the bottom plate 14 a (X-axis direction and Y-axis direction) of the chassis 14.
  • the light guide member 19 has a length direction (a direction in which a support surface 19e and a light emission surface 19a described later are arranged) in the Y-axis direction, and a width direction (a direction perpendicular to the length direction and the plate thickness direction) in the X direction.
  • the axial direction and the plate thickness direction respectively coincide with the Z-axis direction.
  • the light emission surface 19a is emitted toward the panel 11).
  • the end surface is a light incident surface 19b on which light from the LED 17 is incident.
  • the surface opposite to the light emitting surface 19a (back side) is a bottom surface 19c, and the reflection sheet 20 is arranged along the bottom surface 19c.
  • the reflection sheet 20 is made of a synthetic resin having a white surface with excellent light reflectivity, covers the entire bottom surface 19 c of the light guide member 19, and is the light incident surface 19 b of the light guide member 19.
  • the end opposite to the LED 17 side is bent so as to cover the surface 19d on the opposite side.
  • the light guide member 19 has a substantially constant plate thickness dimension (dimension in the Z-axis direction) over the entire region, and therefore, the light emitting surface 19a and the bottom surface 19c described above are parallel to each other without crossing each other. Is done.
  • a scattering portion (not shown) that scatters internal light is patterned to have a predetermined in-plane distribution. The light propagating through the light guide member 19 is reflected by the reflecting portion or scattered by the scattering portion, and is thus urged to be emitted from the light emitting surface 19a to the outside.
  • the in-plane distribution of the reflection part or the scattering part has a lower distribution density toward the side closer to the LED 17 and a higher distribution density toward the side farther from the LED 17. Thereby, the light emitted from the light emitting surface 19a is controlled to have a uniform distribution in the surface.
  • the light guide member 19 having the above-described common structure is used in the backlight device 12 according to the present embodiment, in which four types having different sizes are stacked in the thickness direction (Z-axis direction). Yes. Further, eight sets of four types of light guide members 19 are stacked in parallel in the chassis 14 in the long side direction (X-axis direction, width direction in the light guide member 19). That is, in the present embodiment, four types of the four kinds of light guide members 19 stacked on each other are used, that is, a total of 32 pieces.
  • the different structures of the four types of light guide members 19 will be described in detail.
  • the first light guide member when distinguishing the laminated light guide members 19, the one arranged most on the front side is referred to as a “first light guide member”, and the subscript A is arranged on the reference symbol second and from the front side. Is the second light guide member, and the subscript B is the third from the front side. The third light guide member is the third light guide member, and the subscript C is the fourth from the front side (most back).
  • the subscript is not added to the code.
  • the subscripts A to D described above are also attached when distinguishing the related portions (specifically, the light emitting surface 19a, the light incident surface 19b, the bottom surface 19c, etc.) of each light guide member 19.
  • the four types of light guide members 19A to 19D stacked on each other have the same dimension in the width direction (X-axis direction), that is, the width dimension, but the dimension in the length direction (Y-axis direction), In other words, the length dimension is gradually decreased as the front side (light emission side) gradually increases, and the length dimension gradually increases as the back side (opposite side of the light emission side) gradually increases.
  • the second light guide member 19B, the third light guide member 19C, and the fourth light guide member 19D arranged on the back side of the first light guide member 19A have their length dimensions and main plate surfaces (bottom surfaces 19cB to 19cB).
  • 19cD) is an integral multiple of the length of the first light guide member 19A and the area of the main plate surface (bottom surface 19cA).
  • the second light guide member 19B is laminated immediately behind the first light guide member 19A, and the length dimension and the area of the main plate surface (bottom surface 19cB) are the first light guide member 19A. It is about twice as large.
  • the third light guide member 19C is laminated immediately behind the second light guide member 19B, and the length dimension and the area of the main plate surface (bottom surface 19cC) are about 1.5 times that of the second light guide member 19B. And about 3 times the size of the first light guide member 19A.
  • the fourth light guide member 19D is laminated immediately behind the third light guide member 19C, and the length dimension and the area of the main plate surface (bottom surface 19cD) are about 1.3 times that of the third light guide member 19B.
  • the difference between the length dimension of the light guide member 19C and the area of the main plate surface (bottom surfaces 19cA to 19cC) is substantially the same, and the size is the same as the length dimension of the first light guide member 19A and the main plate surface (bottom surface 19cA). ).
  • the first light guide member 19A arranged on the front side the light emitting surface where the entire area of the main plate surface facing the front side is exposed to the optical member 15 side.
  • the second light guide member 19B to the fourth light guide member 19D stacked on the back side of the first light guide member 19A to the third light guide member 19C are arranged on the main plate surface facing the front side.
  • the first light guide member 19A to the third light guide member 19C which are partially laminated on the front side, are used as support surfaces 19e that support the light guide surfaces 19eB. 19aD.
  • the support surface 19e constitutes a continuous plane together with the adjacent light emitting surface 19a.
  • the light guide members 19A to 19D In the four types of light guide members 19A to 19D stacked on each other, all the light incident surfaces 19b are all flush with each other, and both end faces in the width direction are all flush with each other. In other words, the light guide members 19A to 19D having different lengths are arranged to be offset toward the LED 17 side. Accordingly, among the main plate surfaces facing the front side in the second light guide member 19B to the fourth light guide member 19D, the predetermined region opposite to the LED 17 side is on the front side, and the first light guide member 19A to the third light guide member 19C are on the front side.
  • the predetermined region on the LED 17 side is the support surfaces 19eB to 19eD on which the first light guide member 19A to the third light guide member 19C are stacked on the front side.
  • the support surfaces 19eB to 19eD are disposed between the light emitting surfaces 19aB to 19aD of the second light guide member 19B to the fourth light guide member 19D and the second LED 17B to the fourth LED 17D.
  • the second light guide member 19B to the fourth light guide member 19D have the light emission surfaces 19aB to 19aD in such a manner that the support surfaces 19eB to 19eD are sandwiched between the second LED 17B to the fourth LED 17D.
  • the length direction (Y-axis direction) and the alignment direction of the support surfaces 19eB to 19eD and the light emitting surfaces 19aB to 19aD are the same.
  • the direction from the support surfaces 19eB to 19eD to the light emission surfaces 19aB to 19aD (upward in FIG. 3, right side in FIG. 4) coincides with the direction away from the LED 17, and from the light emission surfaces 19aB to 19aD to the support surfaces 19eB to 19eD.
  • the direction toward (the lower side shown in FIG. 3 and the left side shown in FIG. 4) coincides with the direction approaching the LED 17.
  • the support surfaces 19eB to 19eD of the second light guide member 19B to the fourth light guide member 19D are the bottom surfaces 19cA to 19cA to 19C of the first light guide member 19A to the third light guide member 19C stacked on the front side to be supported. It has the same area as 19cC.
  • the light output surfaces 19aB to 19aD of the second light guide member 19B to the fourth light guide member 19D have the first light guide member 19A stacked on the front side to be supported from the area of the main plate surface facing the front side.
  • the area of the third light guide member 19C is obtained by subtracting the area of the bottom surfaces 19cA to 19cC.
  • the second light guide member 19B has a light emitting surface 19aB in which about half of the main plate surface facing the front side is on the opposite side to the LED 17, and is about half of the LED 17 side.
  • the region is a support surface 19eB that supports the first light guide member 19A.
  • the third light guide member 19C has a light emitting surface 19aC in which about 1/3 of the main plate surface facing the front side is opposite to the LED 17, and is about 2/3 of the LED 17 side. Is a support surface 19eC that supports the second light guide member 19B.
  • about 1/4 of the main plate surface facing the front side on the side opposite to the LED 17 is the light emitting surface 19aD, and about 3/4 of the area on the LED 17 side.
  • the areas of the bottom surfaces 19cB to 19cD forming the main plate surfaces of the second light guide member 19B to the fourth light guide member 19D are the sum of the areas of the light exit surfaces 19aB to 19aD and the areas of the support surfaces 19eB to 19eD, respectively. It is assumed to be equal to the size.
  • the support surfaces 19eB to 19eD of the second light guide member 19B to the fourth light guide member 19D are stacked on the front side, as shown in FIG. Are substantially entirely covered by the reflection sheets 20 arranged along the bottom surfaces 19cA to 19cC.
  • the stage before the light propagating through the second light guide member 19B to the fourth light guide member 19D disposed on the relatively back side (disposed on the lower side) reaches the light exit surfaces 19aB to 19aD.
  • the portion having the support surfaces 19eB to 19eD serves as a light guide unit for guiding the light from the LED 17 toward the light emitting surfaces 19aB to 19aD.
  • the portion having the light emitting surfaces 19aB to 19aD forms a light emitting portion that emits light.
  • the light emission surface 19aC and the light emission surface 19aD of the fourth light guide member 19D are arranged in this order along the Y-axis direction.
  • the light emitting surface 19aA of the first light guide member 19A arranged on the front side is closest to the LED 17, and the light emitting surface 19aD of the fourth light guide member 19D arranged on the back side is the farthest from the LED 17. Yes. That is, the light emitting surfaces 19aA to 19aC of the light guide members 19A to 19C disposed relatively on the front side are relatively closer to the LED 17, and the light emitting surfaces 19aB of the light guide members 19B to 19D disposed relatively on the back side. It is arranged to be relatively far from the LED 17 by about 19 aD.
  • each of the light emission surfaces 19aA to 19aD has a stepped shape.
  • the level difference between 19aA to 19aD is approximately equal to the thickness of each light guide member 19.
  • the light emitting surfaces 19aA to 19aC of the light guide members 19A to 19C relatively arranged on the front side are relatively closer to the optical member 15 and the light emission of the light guide members 19B to 19D relatively arranged on the back side.
  • the surfaces 19aB to 19aD are disposed relatively far from the optical member 15.
  • each light guide member 19 adjacent in the X-axis direction there is a slight gap between each light guide member 19 adjacent in the X-axis direction, and this is an air layer (low refractive index layer) having a lower refractive index than each light guide member 19. AS.
  • This air layer AS prevents the light propagating inside between the light guide members 19 adjacent in the width direction from leaking, thereby ensuring optical independence between the light guide members 19 adjacent in the width direction. be able to.
  • the LED 17 and the LED substrate 18 are configured as follows. That is, as shown in FIGS. 4 and 5, the LED substrate 18 has a dimension in the Z-axis direction, that is, a width dimension, which is obtained by adding the plate thickness dimensions of the four light guide members 19A to 19D stacked on each other. Whereas the LED 17 is slightly larger than the size, the LED 17 is provided corresponding to each of the laminated light guide members 19A to 19D, and the thickness of each of the light guide members 19A to 19D is equal to the thickness. The four are arranged in a straight line along the Z-axis direction (light incident surface 19b) with an interval of.
  • LEDs 17 arranged in the Z-axis direction form one set, and eight sets are arranged in the X-axis so as to individually correspond to the respective light guide members 19 arranged in the X-axis direction. They are arranged in parallel along the direction. That is, in this embodiment, the LED 17 has four LEDs in the Z-axis direction, that is, four in the stacking direction of the light guide members 19, and eight LEDs 17 in the X-axis direction, that is, in the parallel direction of the set of the light guide members 19.
  • the LED board 18 is arranged in parallel on the main plate surface in a matrix, and the total number of the LED boards 18 matches that of the light guide member 19. As shown in FIG.
  • each LED 17 is arranged at the center position in the width direction on the light incident surface 19 b of each corresponding light guide member 19.
  • first LED the most arranged LED on the front side
  • second LED arranged on the front side is designated as “first”.
  • LED has a subscript B attached to the reference, the third one from the front side is assigned as “third LED”, and a subscript C is attached to the reference from the front side to the fourth (most back side) “fourth LED”.
  • a subscript D is added to the reference sign and they are collectively referred to without distinction, the reference sign is not attached.
  • the four first LEDs 17A to 4D 17D arranged along the Z-axis direction can individually control the light emission state.
  • the four first light guide members 19A to 19D stacked along the Z-axis direction are separated from each other by the reflection sheet 20 as shown in FIG. Since independence is ensured, the light incident on the light incident surfaces 19bA to 19bD of the light guide members 19A to 19D from the LEDs 17A to 17D is adjacent to the other light guide members 19A to 19D in the Z-axis direction. The light propagates through the inside without leaking to the side, and is individually emitted from each of the light exit surfaces 19aA to 19D.
  • the amount of light emitted from each of the light guide members 19A to 19D can be uniquely controlled by individually controlling the driving of the LEDs 17A to 17D. Furthermore, the light emission state of the eight LEDs 17 arranged in parallel along the X-axis direction can be individually controlled, whereas the eight light guide members 19 arranged in parallel along the X-axis direction As shown in FIGS. 3 and 5, since the optical independence of each other is ensured by separation by the air layer AS, the amount of light emitted from each light guide member 19 arranged in parallel along the X-axis direction. With regard to the above, it is possible to uniquely control the driving of the LEDs 17 arranged in parallel along the X-axis direction.
  • the entire light emitting surface of the backlight device 12 according to the present embodiment is divided into 32 regions in a matrix by each light emitting surface 19a of each light guide member 19, and the right and left of light emitted from each region. It is possible to individually control the amount of emitted light.
  • the four LEDs 17A to 17D arranged along the Z-axis direction are arranged flush with each other as shown in FIG. 4, whereas the light incident surfaces of the opposing light guide members 19A to 19D are arranged. Since 19bA to 19bD are also flush with each other, the intervals between the LEDs 17A to 17D and the light incident surfaces 19bA to 19bD are all equal.
  • This embodiment has the structure as described above, and its operation will be described next.
  • the separately manufactured liquid crystal panel 11, backlight device 12, bezel 13 and the like are assembled.
  • the manufacturing procedure of the backlight device 12 will be mainly described.
  • the LED substrate 18 formed by mounting the LED 17 integrally having the condenser lens 22 in the chassis 14 is accommodated and attached to the inner surface of the long side plate 14b with screws or the like.
  • the LEDs 17 are arranged at one end portion of the chassis 14 so that the installation work of the LEDs 17 and the design of the wiring configuration thereof are easy, and the cost is excellent.
  • an operation of attaching the holder 21 in the chassis 14 is performed, and an operation of attaching each light guide member 19 in which the reflection sheet 20 is integrated is performed.
  • the light guide member 19 is attached, as shown in FIG.
  • the work of attaching the fourth light guide member 19D to the bottom plate 14a of the chassis 14 is performed in advance, and then the third light guide member 19C is attached to the fourth light guide member. It is placed and stacked on the support surface 19eD of 19D. Thereafter, the second light guide member 19B is placed on the support surface 19eC of the third light guide member 19C, and the first light guide member 19A is placed on the support surface 19eB of the second light guide member 19B. The assembly of the four light guide members 19A to 19D forming the group is completed. The light guide member 19 is attached so that eight sets in the chassis 14 are arranged in parallel in the X-axis direction (FIGS. 3 and 5).
  • the main plate surfaces facing the front side in the second light guide member 19B to the fourth light guide member 19D arranged on the back side are the respective ones in the first light guide member 19A to the third light guide member 19C laminated on the front side. Since the area of each light emitting surface 19aB to 19aD is larger than that of the bottom surfaces 19cA to 19cC, the work of placing the first light guide member 19A to the third light guide member 19C can be easily performed. it can. In addition, the bottom surfaces 19cA to 19cC of the first light guide member 19A to the third light guide member 19C and the support surfaces 19eB to 19eD of the second light guide members 19B to 19D arranged on the back side are parallel to each other.
  • the first light guide member 19A to the third light guide member 19C can be stably supported. Further, when the operator makes a mistake in the stacking order of the light guide members 19A to 19D, the light guide member 19 erroneously arranged on the front side is supported by the light guide member 19 erroneously arranged on the back side. Since the unsupported part is generated, the support state becomes unstable, and the unsupported part is easily lifted, so it is easy for the operator to make a mistake in the stacking order. You can notice.
  • the stacking order of the light guide members 19A to 19D is correct and the case where the stacking order of the light guide members 19A to 19D is incorrect, so that the stacking order remains incorrect. It is possible to more surely prevent the product from being shipped. Further, when performing the above-described laminating operation of the light guide member 19, the light incident surfaces 19bA to 19bD of the light guide members 19A to 19D are flush with each other, and both side surfaces in the width direction are flush with each other. Try to align.
  • the optical member 15 is sequentially stacked on the receiving plate 14d of the chassis 14 and the holder 21, and the work of attaching the frame 16 is performed. Then, the liquid crystal display device 10 is manufactured by attaching the liquid crystal panel 11 and the bezel 13.
  • the drive of the liquid crystal panel 11 is controlled by a liquid crystal panel control unit (not shown), and the drive of each LED 17 in the backlight device 12 is controlled.
  • the illumination light is irradiated to the liquid crystal panel 11, and a predetermined image is displayed on the liquid crystal panel 11.
  • the operation of the backlight device 12 will be described in detail.
  • each LED 17 when each LED 17 is turned on, the light emitted from each LED 17 is emitted while being collected by the condenser lens 22 as shown in FIG. It is efficiently incident on the light incident surface 19b.
  • the light taken into the light guide member 19 through the light incident surface 19b is reflected by the reflection sheet 20 and propagated inside.
  • the first light guide member 19A since the entire area of the main plate surface facing the front side is the light emission surface 19aA, the light propagating through the inside is raised by the reflection sheet 20, and the reflection portion Or the light is scattered by the scattering portion, so that the incident angle with respect to the light emitting surface 19aA is smaller than the critical angle, and most of the light is emitted from the light emitting surface 19aA to the outside on the front side. .
  • the second light guide member 19B to the fourth light guide member 19D and the first light guide member 19A to the third light guide member 19C stacked on the front side are partitioned by the reflection sheet 20. It is avoided that light passes between each other.
  • the light that has propagated through the second light guide member 19B to the fourth light guide member 19D and reached the light exit surfaces 19aB to 19aD side is the same as that of the first light guide member 19A described above, and the light exit surfaces 19aB to 19aD. To the outside of the front side.
  • each light guide member 19 has an air layer AS between the light guide members 19 adjacent to each other in the X-axis direction. By being totally reflected, it is propagated efficiently without leaking outside. Furthermore, since the surface 19d opposite to the light incident surface 19b in each light guide member 19 is covered with the reflection sheet 20 as shown in FIG. 4, a situation where light leaks from the surface 19d to the outside. Thus, light is efficiently guided to the light exit surface 19a.
  • the light guide members 19A to 19D stacked in the Z-axis direction are partitioned from each other by the reflection sheet 20, thereby ensuring mutual optical independence.
  • the light guide members 19 arranged in parallel along the axial direction are separated from each other by the air layer AS, thereby ensuring optical independence from each other.
  • the LED 17 is individually installed for each of the light guide members 19A to 19D stacked in the Z-axis direction and for each light guide member 19 arranged in parallel along the X-axis direction. Therefore, the amount of light emitted from each light guide member 19 is uniquely determined by controlling the light emission state of each LED 17 corresponding to the light guide member 19 individually.
  • each LED 17 corresponding to each light guide member 19 can be individually driven to control the light emission state, so that the entire light emitting surface of the backlight device 12 is divided into 32 regions. It is possible to individually control the amount of light emitted from the light exit surface 19a of each light guide member 19 divided into (FIG. 3). Therefore, the driving of each LED 17 is synchronized with the display image of the liquid crystal panel 11. Specifically, for the LED 17 corresponding to the light guide member 19 in charge of a relatively dark region in the display image of the liquid crystal panel 11, While the light emission amount is relatively reduced, the LED 17 corresponding to the light guide member 19 in charge of a relatively bright region in the display image is relatively increased in the liquid crystal panel 11 by increasing the light emission amount. An appropriate amount of light can be supplied to each region of the display image. As a result, display with excellent contrast performance can be realized, and power consumption can be reduced.
  • the backlight device (illumination device) 12 of the present embodiment has a plurality of LEDs (light sources) 17 and the end portions thereof arranged in opposition to the LEDs 17, and receives light incident on the end portions.
  • the light guide member 19 includes a plurality of light guide members 19 each having a light exit surface 19a to be emitted and a bottom surface 19c located on the opposite side of the light exit surface 19a and parallel to the light exit surface 19a.
  • the LED 17 includes a first LED 17A that is opposed to the end of the first light guide member 19A. (Second LED 17B, third LED 17C) and first It includes at least a second LED 17B (third LED 17C, fourth LED 17D) that is opposed to the end of the light guide member 19B and that is disposed on the side opposite to the light emitting side with respect to the first LED 17A.
  • the light guide member 19B has a support surface 19eB (support surface 19eC, support surface 19eD) that supports the bottom surface 19cA (the bottom surface 19cB and the bottom surface 19cC) of the first light guide member 19A to be laminated, and the support surface 19e.
  • the light emitting surface 19aB (light emitting surface 19aC, light emitting surface 19aD) is sandwiched between the second LEDs 17B.
  • the 2nd light guide member distribute
  • 19B is included at least, while the LED 17 has a first LED 17A that faces the end of the first light guide member 19A and a face that faces the end of the second light guide member 19B. And at least the second LED 17B disposed on the opposite side to the light emitting side with respect to the first LED 17A.
  • the first LED 17A is turned on and the second LED 17B is turned off, the first light guide While the light is emitted from the light emitting surface 19aA of the member 19A, the light of the second light guide member 19B disposed at a position sandwiching the first light guide member 19A supported by the support surface 19eB between the second LED 17B.
  • the control such, not Idemitsu. That is, by controlling the driving of each LED 17 corresponding to each light guide member 19, it is possible to selectively control the amount of light emitted from each light exit surface 19 a of each light guide member 19.
  • the LED 17 since the first LED 17A and the second LED 17B included in the LED 17 can be concentrated and arranged on the end side of the backlight device 12, the LED 17 is also provided on the center side of the backlight device 12. Compared to the case where the LED 17 is distributed, the LED 17 can be easily installed and the wiring configuration can be simplified.
  • the second light guide member 19B has a support surface 19eB that supports the bottom surface 19cA of the stacked first light guide member 19A, and the light emission surface is sandwiched between the second LED 17B and the support surface 19eB. Since the first light guide member 19A can be stably supported by the support surface 19eB and the first light guide member 19A is stacked on the second light guide member 19B during manufacturing. In addition to being excellent in workability, the first light guide member 19A can be avoided from being stacked on the light output surface 19aB of the second light guide member 19B, so that light from the light output surface 19aB is guided to the first light guide. The light can be emitted without passing through the member 19A.
  • the light guide member 19 is in a relationship in which the light exit surface 19a and the bottom surface 19c are parallel, in comparison with the case where the light guide surface 19 is tapered without the light exit surface and the bottom surface being parallel. In addition, it is possible to obtain an effect that it is easy to discriminate between when the light-guiding member 19 is placed in the correct order and when the backlight device 12 is manufactured, and the strength is also excellent.
  • the support surface 19eB of the second light guide member 19B is parallel to the bottom surface 19cA of the first light guide member 19A. In this way, the first light guide member 19A can be supported more stably.
  • the light guide surface 19aA (light output surface 19aB, light output surface 19aC) of the first light guide member 19A (second light guide member 19B, third light guide member 19C) and the second light guide member 19B have.
  • the light emitting surface 19aB has substantially the same area. This makes it easy to control the driving of the first LED 17A and the second LED 17B in adjusting the brightness per unit area in the light emitted from the light exit surfaces 19aA and 19aB.
  • the second light guide member 19B has substantially the same dimension as the first light guide member 19A in the width direction when the arrangement direction of the light emission surface 19aB and the support surface 19eB is the length direction. Is done. In this way, when the first light guide member 19A and the second light guide member 19B are stacked, the first light guide member 19A and the second light guide are provided if the end surfaces in the width direction are aligned with each other.
  • the member 19B can be laminated over the entire width. Therefore, the first light guide member 19A and the second light guide member 19B can be easily positioned, and the workability is excellent.
  • the second light guide member 19B has a light exit surface 19aB relatively far from the LED 17 as compared to the first light guide member 19A, and therefore guides and emits the light from the second LED 17B to the light exit surface 19aB.
  • the second light guide member 19B and the first light guide member 19A have substantially the same dimensions in the width direction, although they are relatively inferior in terms of light use efficiency. The light emitted from the second LED 17B in the member 19B can be efficiently guided to the light exit surface 19aB, and the light utilization efficiency can be improved.
  • the LED 17 is arranged at the center position of the light guide member 19 in the width direction. In this way, light can be propagated in the light guide member 19 evenly compared to the case where the LEDs are arranged at an eccentric position of the light guide member 19 in the width direction, and the light from the light exit surface 19a can be propagated. Unevenness is less likely to occur in the emitted light.
  • a light incident surface 19b on which light from the LED 17 is incident is disposed at an end of the light guide member 19, and the first light guide member 19A and the second light guide member 19B (second light guide member 19B).
  • the third light guide member 19C, the third light guide member 19C, and the fourth light guide member 19D) have light incident surfaces 19bA and 19bB (light incident surfaces 19bB and 19bC, light incident surfaces 19bC and 19bD) that are flush with each other.
  • the first LED 17A and the second LED 17B are arranged linearly along the light incident surfaces 19bA and 19bB.
  • a reflection sheet (reflection member) 20 that is disposed along the bottom surface 19c of the light guide member 19 and reflects light is provided. In this way, the light in the light guide member 19 is reflected by the reflection sheet 20 so that the light can be efficiently propagated in the light guide member 19 and the light stands toward the light exit surface 19a. Can be raised.
  • the reflection sheet 20 disposed on the bottom surface 19cA of the first light guide member 19A covers the support surface 19eB of the second light guide member 19B over the entire area. If it does in this way, it can prevent that the light which propagates the inside of the 2nd light guide member 19B laminated
  • a light incident surface 19b on which light from the LED 17 is incident is disposed at an end portion of the light guide member 19, and the reflection sheet 20 is a surface opposite to the light incident surface 19b in the light guide member 19. It is supposed to cover 19d. In this way, light propagating in the light guide member 19 can be prevented from being emitted from the surface 19d of the light guide member 19 opposite to the light incident surface 19b, thereby further improving the light utilization efficiency. Can be made.
  • first light guide member 19A and the second light guide member 19B have a plurality of width directions when the arrangement direction of the light emitting surface 19aB and the support surface 19eB of the second light guide member 19B is the length direction.
  • first LED 17A and the second LED 17B are arranged side by side
  • a plurality of the first LED 17A and the second LED 17B are arranged side by side in the width direction.
  • the light emitting surface of the entire backlight device 12 can be increased in size.
  • an air layer (low refractive index layer) AS having a relatively lower refractive index than the light guide member 19 is interposed between the light guide members 19 adjacent in the width direction. This makes it difficult for the light in the light guide member 19 to be emitted toward the air layer AS, so that light can be prevented from passing between the adjacent light guide members 19. Optical independence can be ensured. In addition, the amount of light emitted from each light guide member 19 can be sufficiently secured, and the luminance can be improved.
  • the low refractive index layer is an air layer AS. This eliminates the need for a special member for forming the low refractive index layer, and thus can cope with low cost.
  • a condensing lens (light condensing member) 22 that is interposed between the LED 17 and the light guide member 19 and condenses the light from the LED 17 and emits the light toward the light guide member 19 is provided.
  • the light emitted from the LED 17 can be efficiently incident on the light guide member 19.
  • the light use efficiency can be improved, it is possible to improve luminance and reduce power consumption.
  • the condenser lens 22 is provided integrally with the LED 17. In this way, the condenser lens 22 can be easily installed.
  • the light source is the LED 17. In this way, high brightness and low power consumption can be achieved.
  • Embodiment 2 A second embodiment of the present invention will be described with reference to FIG. 6 or FIG.
  • this Embodiment 2 while changing the number and magnitude
  • each light guide member 119 As shown in FIGS. 6 and 7, four light guide members 119 according to the present embodiment are stacked in the Z-axis direction, and the four sets are arranged in parallel in the X-axis direction. Yes. Therefore, the light emitting surface of the entire backlight device 112 is divided into 16 regions in a matrix form by the light emitting surfaces 119a of the light guide members 119. On the other hand, three LEDs 117 are arranged for each light guide member 119, and the total number of LEDs 117 is 48, which is obtained by multiplying the number of light guide members 119 installed (16) by 3. .
  • each of the first LED 117A to the fourth LED 117D is arranged in parallel in the X-axis direction, with four groups each including three, and a total of twelve are arranged.
  • the amount of light emitted from each light emitting surface 119a of each light guide member 119 can be controlled.
  • three LEDs 117 are arranged side by side along the X-axis direction at the center position in the X-axis direction on the light incident surface 119b of the light guide member 119 and at both side positions thereof.
  • a plurality of the first LEDs 117A and the second LEDs 117B are arranged. In this way, it is possible to improve the luminance of the emitted light in each light guide member 119.
  • Embodiment 3 A third embodiment of the present invention will be described with reference to FIG. 8 or FIG. In this Embodiment 3, what changed the shape of the light guide member 219 from above-mentioned Embodiment 1 is shown. In addition, the overlapping description about the same structure, an effect
  • the second light guide member 219B to the fourth light guide member 219D in which the first light guide member 219A to the third light guide member 219C are stacked on the front side are shown in FIG.
  • a projecting light exiting portion 23 having light exit surfaces 219aB to 219aD and projecting to the front side from the support surface 219e is provided.
  • Each protruding light exit portion 23 is formed so that the light exit surfaces 219aB to 219aD that it has are flush with each other and the light exit surface 219aA of the first light guide member 219A is also flush. ing.
  • the projecting dimension of the projecting light exiting portion 23B of the second light guide member 219B is about the plate thickness dimension of the first light guide member 219A.
  • the projecting dimension of the projecting light exiting portion 23C of the third light guide member 219C is set to a size that is the sum of the plate thickness dimensions of the first light guide member 219A and the second light guide member 219B.
  • the projecting dimension of the projecting light output portion 23D of the fourth light guide member 219D is set to a size that is the sum of the thicknesses of the first light guide member 219A to the third light guide member 219C.
  • each The optical path length until the light emitted from the light emission surfaces 219aA to 219aD reaches the optical member 215 can be made uniform. Accordingly, the optical member 215 can be irradiated evenly by the emitted light from each of the light emitting surfaces 219aA to 219aD.
  • the light exit surfaces 219aA to 219aD flush with the projecting light exiting portion 23
  • the following effects can be obtained.
  • the configuration of the backlight device 212 ′ is changed and the optical member 215 ′ is directly stacked on the light guide member 219, they are flush with each other.
  • the optical member 215 ' can be stably supported by the light emitting surfaces 219aA to 219aD having a shape.
  • the inclined surface 24 is inclined to the left in FIG. 8 in the Y-axis direction, that is, to rise to the front side in a direction away from the second LED 217B to the fourth LED 217D corresponding to the second light guide member 219B to the fourth light guide member 219D. have. Since the reflection sheet 220 is arranged along the inclined surface 24, the light that has reached the protruding light exiting portions 23B to 23D among the light propagating through the second light guide member 219B to the fourth light guide member 219D is not reflected.
  • the reflection sheet 220 is efficiently launched toward the light emitting surfaces 219aB to 219aD.
  • the second light guide member 219B to the fourth light guide member 219D have light emission surfaces 219aB to 219aD farther from the LED 217 than the first light guide member 219A.
  • the light can be efficiently launched to the light exit surfaces 219aB to 219aD by the inclined surface 24, there is a difference in the light use efficiency with the first light guide member 219A. It has become difficult.
  • the first light guide member 219A has the light exit surface 219aA relatively near the LED 217 as compared with the second light guide member 219B to the fourth light guide member 219D, so that the inclined surface 24 is not formed. Sufficient light utilization efficiency is ensured. Rather, the first light guide member 219A can stabilize the support posture by forming the bottom surface 219cA in parallel with the support surface 219eB of the second light guide member 219B.
  • the second light guide member 219B (third light guide member 219C, fourth light guide member 219D) has a light emission surface 219aB (light emission surface 219aC, light emission surface 219aD).
  • a protruding light portion 23B (a protruding light portion 23C, a protruding light portion 23D) that protrudes further to the light emission side than the support surface 219eB (support surface 219eC, support surface 219eD).
  • the protruding light exiting portion 23B protrudes from the support surface 219eB to the light exit side, the light exit surface 219aA of the first light guide member 219A and the second light guide member 219B A step can be relaxed or eliminated with respect to the light exit surface 219aB of the protruding light exit portion 23B.
  • the stability is excellent, and from when the light exits each light exit surface 219a to the other members described above.
  • the difference in optical path length can be reduced or eliminated.
  • the protruding light exiting portion 23B of the second light guide member 219B is formed such that the light exit surface 219aB it has is flush with the light exit surface 219aA of the first light guide member 219A. In this way, it is possible to eliminate a step between the light emission surface 219aA of the first light guide member 219A and the light emission surface 219aB of the protruding light output portion 23B of the second light guide member 219B. As a result, for example, the stability when the other member is placed on the light emitting surface 219a is extremely excellent, and the difference in the optical path length from when the light exits each light emitting surface 219a to the other member described above can be obtained. Can be resolved.
  • bottom surface 219cB bottom surface 219cC, bottom surface 219cD
  • a portion that overlaps with the protruding light emitting portion 23B in a plan view is away from the second LED 217B (third LED 217C, fourth LED 217D).
  • An inclined surface 24 having a gradient that rises toward the light exit side is formed. In this way, since the second light guide member 219B has the light exit surface 219aB relatively far from the LED 217 compared to the first light guide member 219A, the light from the second LED 217B is transmitted to the light exit surface 219aB.
  • the inclined surface 24 is formed in a portion overlapping the protruding light portion 23B having the light emission surface 219aB in the bottom surface 219cB.
  • the internal light can be efficiently launched toward the light exit surface 219aB.
  • the light use efficiency in the second light guide member 219B can be improved, and a difference in the light use efficiency with the first light guide member 219A can be made difficult to occur.
  • Embodiment 4 A fourth embodiment of the present invention will be described with reference to FIG. 10 or FIG. In this Embodiment 4, what changed the installation number and arrangement
  • the light guide member 319 is a back-to-back arrangement of four sets laminated in the Z-axis direction. Therefore, the light emitting surface of the entire backlight device 312 is divided into 64 regions in a matrix by each light emitting surface 319a included in each light guide member 319.
  • a pair of LED substrates 318 are arranged at both ends on the long side of the chassis 314, and the light guide member 319 group described above is sandwiched in the Y-axis direction.
  • four LEDs 317 are arranged in parallel in a matrix, with four LEDs 317 each in the Z-axis direction and eight LEDs 317 in the X-axis direction.
  • Such a configuration is more suitable for increasing the size of the backlight device 312.
  • the light guide member 419 has eight sets of four layers stacked in the Z-axis direction arranged in parallel in the X-axis direction and the X-axis direction. Are adjacent to each other with respect to the Y-axis direction. More specifically, there are two types of sets composed of four light guide members 419, and one set has each light guide member 419 on the left side of the figure as shown in FIG. In FIG. 12, the light guide members 419 are arranged close to the right side (upper side in FIG. 12) as shown in FIG. 14. .
  • each light guide member 419 forming an odd-numbered set counted from the left end shown in FIG. 12 is arranged close to the left side of the same figure as shown in FIG. They are arranged facing the left side of the figure.
  • the light guide members 419 forming even-numbered pairs from the left end shown in FIG. 12 are arranged close to the right side of the figure as shown in FIG. 14, and the light incident surfaces 419b are the same. It is arranged in a shape facing the right side of the figure.
  • a pair of LED substrates 418 are arranged on both ends of the long side of the chassis 414, and the light guide member 419 group described above is sandwiched in the Y-axis direction.
  • the LEDs 417 mounted on the LED substrates 418 are intermittently arranged in the X-axis direction corresponding to the light incident surfaces 419b of the light guide members 419 that are inverted as described above.
  • the LEDs 417 are arranged only at positions on the LED substrate 418 facing the light incident surface 419b of each light guide member 419, the arrangement interval between the LEDs 417 arranged in parallel in the X-axis direction is as described above. Compared to Form 1, it is about twice as large.
  • the LED 417 mounted on the LED substrate 418 disposed on the lower side shown in FIG. 12 and the LED 417 mounted on the LED substrate 418 disposed on the upper side of FIG. 12 are formed of one light guide member 419 in the X-axis direction. The arrangement is shifted by the width dimension. A total of 16 LEDs 417 are arranged in parallel in a matrix on the LED substrate 418, four in the Z-axis direction and four in the X-axis direction.
  • the present invention is not limited to the embodiments described with reference to the above description and drawings.
  • the following embodiments are also included in the technical scope of the present invention.
  • the specific number of stacked light guide members stacked in the thickness direction can be changed as appropriate. That is, the number of laminated light guide members can be 3 or less, or 5 or more. In that case, the number of LEDs arranged in the Z-axis direction may be changed to 3 or less or 5 or more according to the number of laminated light guide members.
  • the specific number of light guide members arranged in parallel in the width direction (X-axis direction) can be changed as appropriate. That is, the number of light guide members arranged in parallel can be 7 or less, or 9 or more.
  • the LED substrate is arranged on the long side of the chassis, and the arrangement direction of the LED and the light emitting surface of the light guide member coincides with the short side direction of the chassis.
  • the present invention includes a configuration in which the LED substrate is disposed on the short side of the chassis, and the arrangement direction of the LEDs and the light emitting surface of the light guide member coincides with the long side direction of the chassis. In that case, it is preferable to arrange a pair of LED substrates on both sides as in the fourth embodiment.
  • the bottom surfaces of the first light guide member to the third light guide member and the support surfaces of the second light guide member to the fourth light guide member that receive the bottom surface are parallel to each other.
  • the present invention includes a configuration in which the bottom surface and the support surface are not parallel to each other.
  • the light output surfaces of the light guide members stacked on each other have the same area.
  • the areas of the light output surfaces of the light guide members stacked on each other are Partially or entirely different settings are possible.
  • the light guide members stacked with each other have the same width dimension, but the width dimensions of the light guide members stacked with each other are set to be partially or completely different. It is also possible.
  • the light incident surfaces of the light guide members stacked on each other are arranged so that they are flush with each other. It is also possible to make an arrangement that is partially or completely shifted (an arrangement that is not flush).
  • the LED is disposed at the center position in the width direction on the light incident surface of the light guide member facing the LED.
  • the LED is arranged in the width direction on the light incident surface of the light guide member.
  • the present invention also includes an arrangement that is eccentric from the central position.
  • the LEDs arranged along the light guide member stacking direction are linearly arranged.
  • the LEDs aligned along the light guide member stacking direction are arranged along the X axis.
  • the present invention also includes an arrangement shifted in the direction (width direction of the light guide member).
  • the present invention includes a configuration in which two reflection sheets are configured and divided into one that covers the bottom surface of the light guide member and one that covers the surface opposite to the light incident surface of the light guide member.
  • the reflection sheet covers the entire support surface of the light guide member laminated on the back side, but the support surface of the light guide member on which the reflection sheet is laminated on the back side is partially What was made into the form covered automatically is also contained in this invention.
  • the reflection sheet is configured to cover the surface opposite to the light incident surface in addition to the bottom surface of the light guide member. It is also possible to adopt a form in which only the bottom surface of the light incident surface is covered and the surface opposite to the light incident surface is not covered.
  • the air layer is interposed between the light guide members arranged in parallel in the width direction (X-axis direction), but a reflective sheet is interposed instead of the air layer. It doesn't matter.
  • the air layer is used as the low refractive index layer interposed between the light guide members arranged in parallel in the width direction (X-axis direction), but the low refractive index material is used. It is also possible to use a refractive index layer.
  • the liquid crystal panel is exemplified as a vertically placed state in which the short side direction coincides with the vertical direction, but the liquid crystal panel matches the long side direction with the vertical direction. What is set in a vertical state is also included in the present invention.
  • the TFT is used as the switching element of the liquid crystal display device.
  • 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 (TFD)), and color display.
  • a switching element other than the TFT for example, a thin film diode (TFD)
  • color display for example, a liquid crystal display device
  • the present invention can be applied to a liquid crystal display device that displays black and white.
  • the liquid crystal display device using the liquid crystal panel as the display panel has been exemplified.
  • the present invention can also be applied to display devices using other types of display panels.
  • the television receiver provided with the tuner is exemplified, but the present invention is also applicable to a display device that does not include the tuner.
  • SYMBOLS 10 Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12, 312 ... Backlight device (illumination device), 17, 117, 217, 317, 418 ... LED (light source), 17A, 117A, 217A ... 1st LED (1st light source), 17B, 117B, 217B ... 2nd LED (1st light source, 2nd light source), 17C, 117C, 217C ... 3rd LED (1st light source, 2nd light source), 17D, 117D, 217D ... 4th LED (2nd light source), 19, 119, 219, 319, 419 ... Light guide member, 19A, 219A ...

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Planar Illumination Modules (AREA)

Abstract

La présente invention concerne un dispositif de rétro-éclairage (12), ledit dispositif comprenant une pluralité de LED (17), ainsi qu'une pluralité d'éléments de guidage de lumière (19), dont chacun possède une surface de sortie de lumière (19a) dont une partie d'extrémité est disposée de façon à faire face à chacune des LED (17), ladite surface de sortie de lumière sortant la lumière qui a été entrée à partir de la partie d'extrémité, et dont chacun possède également une surface inférieure (19c) positionnée au verso de la surface de sortie de lumière (19a) et parallèle à celle-ci. Les éléments de guidage de lumière (19) comprennent un premier élément de guidage de lumière (19A), et un second élément de guidage de lumière (19B), qui est stratifié sur le côté arrière du premier élément de guidage de lumière (19A). Les LED (17) comprennent une première LED (17A) qui fait face à la partie d'extrémité du premier élément de guidage de lumière (19A), et une seconde LED (17B), qui fait face à une partie d'extrémité du second élément de guidage de lumière (19B), et qui est disposée sur le côté arrière de la première LED (17A). Le second élément de guidage de lumière (19B) possède une surface d'appui (19e), qui supporte la surface inférieure (19c) du premier élément de guidage de lumière (19A), et la surface de sortie de lumière (19a) de telle manière que la surface d'appui (19e) est prise en sandwich entre la surface de sortie de lumière et la seconde LED (17B).
PCT/JP2011/063044 2010-07-21 2011-06-07 Dispositif d'éclairage, dispositif d'affichage et récepteur de télévision WO2012011327A1 (fr)

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JP2010164022 2010-07-21

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013124895A1 (fr) * 2012-02-22 2013-08-29 Empire Technology Development Llc Dispositif d'éclairage comprenant une structure de guidage de lumière
GB2568024A (en) * 2017-09-25 2019-05-08 Emotech Ltd Display device
CN110173657A (zh) * 2018-02-21 2019-08-27 汽车照明意大利独资股份有限公司 具有分段发光部分的汽车照明和/或信号装置
JP7495203B2 (ja) 2018-02-21 2024-06-04 マレッリ・オートモーティブ・ライティング・イタリー・ソチエタ・ペル・アツィオーニ 分割照明部を備えた自動車用照明および／または信号装置

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JP2006190684A (ja) * 2004-12-30 2006-07-20 Osram Opto Semiconductors Gmbh 複数の半導体光源を有する照明装置
JP2009170325A (ja) * 2008-01-18 2009-07-30 Minebea Co Ltd 面状照明装置
JP2010008682A (ja) * 2008-06-26 2010-01-14 Hitachi Ltd 照明装置を用いた液晶表示装置
JP2010086671A (ja) * 2008-09-29 2010-04-15 Fujifilm Corp 光源装置

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Publication number Priority date Publication date Assignee Title
JP2006190684A (ja) * 2004-12-30 2006-07-20 Osram Opto Semiconductors Gmbh 複数の半導体光源を有する照明装置
JP2009170325A (ja) * 2008-01-18 2009-07-30 Minebea Co Ltd 面状照明装置
JP2010008682A (ja) * 2008-06-26 2010-01-14 Hitachi Ltd 照明装置を用いた液晶表示装置
JP2010086671A (ja) * 2008-09-29 2010-04-15 Fujifilm Corp 光源装置

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013124895A1 (fr) * 2012-02-22 2013-08-29 Empire Technology Development Llc Dispositif d'éclairage comprenant une structure de guidage de lumière
US8956038B2 (en) 2012-02-22 2015-02-17 Empire Technology Development Llc Lighting device having a light guide structure
GB2568024A (en) * 2017-09-25 2019-05-08 Emotech Ltd Display device
CN110173657A (zh) * 2018-02-21 2019-08-27 汽车照明意大利独资股份有限公司 具有分段发光部分的汽车照明和/或信号装置
EP3531404A1 (fr) * 2018-02-21 2019-08-28 Automotive Lighting Italia S.p.A. Lampe de véhicule et/ou dispositif de signalisation
KR20190100835A (ko) * 2018-02-21 2019-08-29 오토모티브 라이팅 이탈리아 에스.피.에이 세그먼트 조명 부분들을 구비한 자동차 조명 및/또는 시그널링 장치
JP2019145483A (ja) * 2018-02-21 2019-08-29 オートモーティブ・ライティング・イタリア・ソチエタ・ペル・アツィオーニＡＵＴＯＭＯＴＩＶＥ ＬＩＧＨＴＩＮＧ ＩＴＡＬＩＡ Ｓ．ｐ．Ａ． 分割照明部を備えた自動車用照明および／または信号装置
US10591128B2 (en) 2018-02-21 2020-03-17 Marelli Automotive Lighting Italy S.p.A. Automotive lighting and/or signalling device with segmented lighting portions
CN110173657B (zh) * 2018-02-21 2023-07-18 马瑞利汽车照明意大利公司 具有分段发光部分的汽车照明和/或信号装置
KR102590107B1 (ko) * 2018-02-21 2023-10-17 마렐리 오토모티브 라이팅 이탈리아 에스.피.에이. 세그먼트 조명 부분들을 구비한 자동차 조명 및/또는 시그널링 장치
JP7495203B2 (ja) 2018-02-21 2024-06-04 マレッリ・オートモーティブ・ライティング・イタリー・ソチエタ・ペル・アツィオーニ 分割照明部を備えた自動車用照明および／または信号装置

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