WO2012169439A1 - Dispositif d'éclairage, dispositif d'affichage et dispositif de réception de télévision - Google Patents

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

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Publication number
WO2012169439A1
WO2012169439A1 PCT/JP2012/064261 JP2012064261W WO2012169439A1 WO 2012169439 A1 WO2012169439 A1 WO 2012169439A1 JP 2012064261 W JP2012064261 W JP 2012064261W WO 2012169439 A1 WO2012169439 A1 WO 2012169439A1
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WO
WIPO (PCT)
Prior art keywords
light
light source
led
opening
extended
Prior art date
Application number
PCT/JP2012/064261
Other languages
English (en)
Japanese (ja)
Inventor
寺川　大輔
Original Assignee
シャープ株式会社
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Filing date
Publication date
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Publication of WO2012169439A1 publication Critical patent/WO2012169439A1/fr

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    • 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
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—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
    • G02B6/0033—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
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
    • 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
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0091—Positioning aspects of the light source relative to the light guide

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.
  • the edge light type backlight device may adopt a configuration in which a plurality of light sources are intermittently arranged in parallel along the light incident surface provided at the end of the light guide plate.
  • the following problem may occur. There is sex. That is, the light quantity emitted from the plurality of light sources and incident on the light incident surface may be uneven due to the arrangement pattern and the non-arrangement pattern in the plurality of light sources intermittently arranged in parallel.
  • the present invention has been completed based on the above situation, and an object thereof is to suppress luminance unevenness.
  • the illumination device includes a plurality of light sources intermittently arranged side by side, a light incident surface that is arranged to face the light sources and receives light from the light sources, and emits the incident light.
  • a light guide plate having a light exit surface, a reflective member disposed opposite to the light incident surface and following the non-arrangement pattern of the light source, and extended from the reflective member toward the light incident surface side. And an extended reflecting portion.
  • the light emitted from the plurality of light sources is incident on the light incident surface of the light guide plate arranged opposite to the light sources, then propagates through the light guide plate, and then is emitted from the light exit surface.
  • the light from the light source is disposed so as to be opposed to the light incident surface and is imitated according to the non-arrangement pattern of the light source before entering the light incident surface, and the light from the reflective member.
  • the light is efficiently reflected by the extended reflecting portion that extends toward the incident surface side. Accordingly, the amount of light incident on the light incident surface of the light guide plate is made uniform regardless of the arrangement pattern and the non-arrangement pattern in the plurality of light sources arranged intermittently side by side, and unevenness hardly occurs. As a result, luminance unevenness is less likely to occur in the light emitted from the light exit surface of the light guide plate.
  • the extended reflection part is extended from the reflection member, workability related to assembly can be improved.
  • a low-light-reflectance member is provided that is disposed so as to overlap the extended-reflecting portion on the side opposite to the light source side and that has a relatively low light reflectance than the extended-reflecting portion.
  • the extended reflection portion has an opening that follows the arrangement pattern of the light sources. In this way, the light reflection is suppressed by the low-light reflectance member exposed through the opening that follows the light source arrangement pattern, so that the amount of light incident on the light incident surface of the light guide plate is less likely to be uneven. Become.
  • the opening is disposed at a position overlapping at least the light source in a plan view in the extended reflection portion. In this way, since the opening is formed at a position where much of the light emitted from the light source is irradiated in the extended reflection portion, the light that tends to be excessive due to the low light reflectance member exposed through the opening. Reflection can be effectively suppressed.
  • a light source opening through which the light source passes is formed in the reflecting member following the arrangement pattern of the light source, and the opening communicates with the light source opening.
  • the opening and the light source opening have substantially the same opening front at the communication part. By doing so, it is possible to avoid the formation of a step at the communication portion between the opening and the light source opening, and thus the shapes of the reflecting member and the extended reflecting portion can be made simpler.
  • the opening is configured to have a smaller area in a direction away from the light source.
  • the exposed area of the low light reflectance member exposed through the opening decreases in the direction away from the light source, while the area of the extended reflection portion decreases in the direction away from the light source. growing.
  • the light emitted from the light source spreads away from the light source, and unevenness tends to be alleviated. Therefore, light reflection is mainly suppressed by a low light reflectance member at a position relatively close to the light source. While suppressing unevenness, the luminance can be improved by increasing the efficiency of light reflection mainly by the extended reflection portion at a position relatively far from the light source.
  • the opening has an inclined edge so that the opening front becomes narrower in a direction away from the light source.
  • the edge of the opening inclined by making the edge of the opening inclined, the exposed area of the low light reflectance member continuously decreases gradually in the direction away from the light source, whereas the area of the extended reflecting portion is Then, since it gradually increases gradually toward the direction away from the light source, it is possible to improve the luminance while suppressing the unevenness more effectively.
  • An extended portion that extends across the opening along the direction in which the light sources are arranged is provided at an end of the extended reflecting portion on the light incident surface side.
  • the extension portion makes the shape of the end portion on the light incident surface side of the extended reflection portion simple, and hence the handleability of the extended reflection portion is excellent.
  • the extended reflection part is arranged in a range that follows the arrangement pattern of the light source in addition to the non-arrangement pattern of the light source, and the extended reflection part has a low light reflection with a relatively low light reflectance.
  • a low-light-reflectance printing unit that follows the arrangement pattern of the light sources is provided by printing the rate material.
  • the non-formation part in which the low light reflectance printing part that follows the light source arrangement pattern in the extended reflection part is formed according to the light source non-arrangement pattern. Accordingly, light reflection is suppressed by the low light reflectance printing portion that follows the arrangement pattern of the light source, whereas light reflection is highly efficient due to the non-formation portion of the low light reflectance printing portion in the extended reflection portion. As a result, the amount of light incident on the light incident surface of the light guide plate is less likely to be uneven.
  • a chassis that accommodates the light source and the light guide plate is provided, and the extended reflection portion is disposed so as to overlap a surface of the chassis on the light source side. In this way, the shape of the extended reflecting portion can be maintained by the chassis that houses the light source and the light guide plate.
  • the extended reflection portion is formed so as to extend so as to overlap with the light guide plate in a plan view, and the overlap portion is sandwiched between the light guide plate and the chassis. If it does in this way, an extended reflection part can be stably hold
  • a light source substrate on which a plurality of the light sources are mounted is provided, and the reflecting member is attached to the light source substrate.
  • the reflecting member is attached to the light source substrate on which a plurality of light sources are mounted, it is difficult for the reflecting member to be displaced with respect to the non-arranged pattern of the light sources. As a result, the amount of light incident on the light incident surface of the light guide plate is less likely to be uneven.
  • a light scattering portion that scatters light and a light guide reflection member that covers the light scattering portion and reflects light are provided on a surface opposite to the light emitting surface of the light guide plate.
  • the light scattering portion has a distribution in which the degree of light scattering is substantially constant with respect to the arrangement direction of the light sources. In this way, the light incident on the light incident surface of the light guide plate is reflected by the light guide reflecting member while being scattered by the light scattering portion provided on the surface opposite to the light emitting surface. The light is emitted from the emission surface.
  • the light exit surface uniformly emits light from each light source regardless of the positional relationship with respect to the arrangement direction of the light sources with respect to a plurality of light sources. Can be emitted.
  • the light from the light source is uniformed regardless of the arrangement pattern and the non-arrangement pattern in the plurality of light sources by the reflection member and the extended reflection portion at the stage of entering the light incident surface of the light guide plate, thereby causing unevenness. It has become difficult.
  • 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 uneven brightness, it is possible to realize display with excellent display quality.
  • 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.
  • 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 display device The top view which shows arrangement
  • FIG. 1 The enlarged plan view which shows the arrangement structure of the light-guide plate, LED board, reflection member, and extended reflection part which concern on the modification 1 of Embodiment 1.
  • FIG. 2 The enlarged plan view which shows the arrangement structure of the light-guide plate, LED board, reflection member, and extended reflection part which concern on the modification 2 of Embodiment 1.
  • FIG. 2 The enlarged plan view which shows the arrangement structure of the light-guide plate, LED board, reflection member, and extended reflection part which concern on Embodiment 2 of this invention. Sectional view taken along line xii-xii in FIG.
  • the enlarged plan view which shows the arrangement structure of the light-guide plate, LED board, reflection member, and extended reflection part which concern on the modification 1 of Embodiment 2.
  • FIG. 1 The enlarged plan view which shows the arrangement structure of the light-guide plate, LED board, reflection member, and extended reflection part which concern on the modification 2 of Embodiment 2.
  • FIG. The graph showing the change of the light reflectance in the arrangement direction of LED of the surface facing LED in the 2nd light source clamping part.
  • the graph showing the change of the light reflectivity in the arrangement direction of LED of the surface facing LED in the 2nd light source clamping part which concerns on the modification 3 of Embodiment 2.
  • FIG. The graph showing the change of the light reflectivity in the arrangement direction of LED of the surface facing LED in the 2nd light source clamping part which concerns on the modification 4 of Embodiment 2.
  • FIG. 1 The enlarged plan view which shows the arrangement structure of the light-guide plate, LED board, reflection member, and extended reflection part which concern on the modification 5 of Embodiment 2.
  • FIG. The enlarged plan view which shows the arrangement configuration of the light-guide plate, LED board, reflection member, and extended reflection part which concern on the modification 6 of Embodiment 2.
  • 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 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 rectangular shape (rectangular shape, longitudinal 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 rectangular shape (rectangular shape, longitudinal shape) in a plan view, and a pair of glass substrates having excellent translucency are separated by a predetermined gap.
  • the liquid crystal is sealed between both substrates.
  • One 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.
  • a color filter in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement, a counter electrode, and an alignment film.
  • a polarizing plate is disposed on the outside of both substrates.
  • the backlight device 12 includes a chassis 14 having a substantially box shape having a light emitting portion 14 c that opens toward the front side (light emitting side, liquid crystal panel 11 side), and light emitting from the chassis 14.
  • a light transmissive member 15 disposed so as to cover the portion 14c.
  • an LED (Light Emitting Diode) 17 that is a light source
  • an LED substrate 18 on which the LED 17 is mounted and a light transmissive member 15 (liquid crystal panel) that guides light from the LED 17.
  • a frame (pressing member) 16 for pressing the light guide plate 19 and the light transmissive member 15 from the front side.
  • the backlight device 12 includes LED substrates 18 having LEDs 17 at both ends on the long side, and a light guide plate 19 disposed at the center between the LED substrates 18 on both sides.
  • the so-called edge light type (side light type) is used. Below, each component of the backlight apparatus 12 is demonstrated in detail.
  • the chassis 14 is made of, for example, a metal plate such as an aluminum plate or an electrogalvanized steel plate (SECC), and as shown in FIGS. It consists of a side plate 14b that rises one by one from each outer end on the long side and the short side in 14a.
  • 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).
  • the frame 16 and the bezel 13 can be screwed to the side plate 14b.
  • the light transmissive member 15 has a horizontally long rectangular shape as seen in a plan view like the liquid crystal panel 11 and the chassis 14, and the long side direction on the main surface is short with the X axis direction.
  • the side direction coincides with the Y-axis direction, and the thickness direction perpendicular to the main surface coincides with the Z-axis direction.
  • the light transmissive member 15 is placed on the front side (light emitting side) of the light guide plate 19 and is disposed between the liquid crystal panel 11 and the light guide plate 19.
  • the light transmissive member 15 is disposed so as to cover the light emitting surface 19a of the light guide plate 19 from the front side over almost the entire area, thereby transmitting the emitted light from the light emitting surface 19a and providing a predetermined optical action.
  • the light can be emitted toward the liquid crystal panel 11 side.
  • the light transmissive member 15 has a sheet shape that is thinner than the light guide plate 19, and a plurality of, specifically, four, are laminated and arranged. Yes.
  • Specific examples of the light transmissive member 15 include a diffusion sheet 15a, a prism sheet (lens sheet) 15b, a reflective polarizing sheet 15c, and the like, which can be appropriately selected and used. is there.
  • a configuration in which the light transmissive member 15 is laminated in the order of one diffusion sheet 15a, two prism sheets 15b, and one reflective polarizing sheet 15c from the back side is illustrated.
  • the diffusion sheet 15a has a function of diffusing light from the light guide plate 19 by bonding a diffusion layer in which light diffusion particles are dispersed and blended to the surface of a transparent base made of synthetic resin.
  • the prism sheet 15b has a prism for adjusting the traveling direction of light from the diffusion sheet 15a.
  • the reflective polarizing sheet 15c has, for example, a multilayer structure in which layers having different refractive indexes are alternately stacked. The reflective polarizing sheet 15c transmits p-waves of light from the prism sheet 15b and reflects s-waves toward the light guide plate 19 side. This makes it possible to increase the light utilization efficiency (and hence the luminance).
  • the frame 16 is made of a synthetic resin and is formed in a frame shape (frame shape) extending along the outer peripheral edge portions of the light transmissive member 15 and the light guide plate 19.
  • the light transmitting member 15 and the outer peripheral edge of the light guide plate 19 are opposed to each other and can be pressed from the front side over almost the entire circumference.
  • the frame 16 protrudes from the outer peripheral end of the holding base 16a toward the back side and surrounds the side plate 14b of the chassis 14 from the outside (externally fitted).
  • a peripheral wall portion 16b having a short cylindrical shape.
  • the holding base portion 16a has a pair of short side portions and long side portions, and the pair of long side portions thereof includes a pair of first light source sandwiching portions 16c that sandwich the LED 17 with the bottom plate 14a of the chassis 14; Is done.
  • the first light source sandwiching portion 16 c is disposed on the front side of the LED 17, that is, on the light emitting surface 19 a side of the light guide plate 19 so as to face the LED 17.
  • a pair of first reflecting sheets (light emitting surface side reflecting members) 20 for reflecting light are provided on the front side surfaces of the pair of first light source sandwiching portions 16c, that is, the surfaces facing the LEDs 17, respectively. It is attached.
  • the first reflection sheet 20 is made of synthetic resin, and the surface thereof is white with excellent light reflectivity, and the light reflectance on the surface is determined by the frame 16 (first light source sandwiching portion 16c). It is assumed that it is relatively higher than the light reflectance on the surface of the film.
  • the holding base portion 16a has a slight gap between it and the main surface on the front side of the light transmitting member 15 (reflective polarizing sheet 15c) arranged on the most front side (the side opposite to the light guide plate 19 side). However, they are arranged opposite to each other so that the light transmitting member 15 can be prevented from being wrinkled due to being restrained by the frame 16 during thermal expansion or contraction. Further, the pressing base 16a can receive the outer peripheral edge of the liquid crystal panel 11 from the back side.
  • the LED 17 has a configuration in which an LED chip is sealed with a resin material on a substrate portion fixed to the LED substrate 18.
  • the LED chip mounted on the substrate unit has one main emission wavelength, and specifically, one that emits blue light in a single color is used.
  • the resin material that seals the LED chip is dispersed and blended with a phosphor that emits a predetermined color when excited by the blue light emitted from the LED chip, and generally emits white light as a whole. It is said.
  • the phosphor for example, a yellow phosphor that emits yellow light, 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.
  • the LED substrate 18 has an elongated plate shape that extends along the long side direction of the chassis 14 (X-axis direction, the longitudinal direction of the light incident surface 19 b of the light guide plate 19).
  • the main surface is accommodated in the chassis 14 in a posture parallel to the X-axis direction and the Z-axis direction, that is, in a posture orthogonal to the plate surfaces of the liquid crystal panel 11 and the light guide plate 19 (light transmissive member 15).
  • the LED boards 18 are arranged in pairs corresponding to both ends on the long side in the chassis 14 and are attached to the inner surfaces of the side plates 14b on the long side.
  • the LED 17 having the above-described configuration is surface-mounted on the inner surface, that is, the surface facing the light guide plate 19 side (the surface facing the light guide plate 19) of the LED substrate 18, and this is the mounting surface 18a. Is done.
  • a plurality of LEDs 17 are arranged in a line (linearly) in parallel on the mounting surface 18a of the LED substrate 18 along the length direction (X-axis direction) with a predetermined interval. That is, it can be said that a plurality of LEDs 17 are intermittently arranged in parallel along the long side direction at both ends on the long side of the backlight device 12.
  • the interval between the LEDs 17 adjacent to each other in the X-axis direction, that is, the arrangement pitch of the LEDs 17 is substantially equal.
  • the arrangement direction of the LEDs 17 coincides with the length direction (X-axis direction) of the LED substrate 18.
  • a wiring pattern (not shown) made of a metal film (such as a copper foil) that extends along the X-axis direction and connects the adjacent LEDs 17 across the LED 17 group in series.
  • the terminal portions formed at both ends of the wiring pattern are connected to an external LED drive circuit, so that drive power can be supplied to each LED 17.
  • each LED 17 substantially coincides with the Y-axis direction.
  • the LEDs 17 mounted on the pair of LED substrates 18 are respectively arranged in opposition to both ends in the Y-axis direction (both ends on the long side) of the light guide plate 19.
  • the base material of the LED substrate 18 is made of metal like the chassis 14, and the wiring pattern (not shown) described above is formed on the surface thereof via an insulating layer.
  • insulating materials such as a ceramic, can also be used as a ceramic.
  • the light guide plate 19 is made of a synthetic resin material (for example, acrylic resin such as PMMA or polycarbonate) having a refractive index sufficiently higher than air and substantially transparent (excellent translucency).
  • the light guide plate 19 has a horizontally long rectangular shape in a plan view as in the case of the liquid crystal panel 11 and the chassis 14, and has a plate shape that is thicker than the light transmissive member 15.
  • the long side direction on the main surface coincides with the X-axis direction
  • the short side direction coincides with the Y-axis direction
  • the plate thickness direction orthogonal to the main surface coincides with the Z-axis direction.
  • the light guide plate 19 is disposed in the chassis 14 at a position directly below the liquid crystal panel 11 and the light transmissive member 15, and forms a pair disposed at both ends of the long side of the chassis 14.
  • the LED boards 18 are arranged so as to be sandwiched in the Y-axis direction. Therefore, the alignment direction of the LED 17 (LED substrate 18) and the light guide plate 19 coincides with the Y-axis direction, whereas the alignment direction of the light transmissive member 15 (liquid crystal panel 11) and the light guide plate 19 is the Z-axis direction. And the arrangement directions of the two are orthogonal to each other.
  • the light guide plate 19 introduces light emitted from the LED 17 in the Y-axis direction, and rises and emits the light toward the light transmissive member 15 side (front side) while propagating the light inside.
  • the light guide plate 19 has a substantially flat plate shape extending along each main surface of the bottom plate 14a of the chassis 14 and the light transmissive member 15, and the main surface is parallel to the X-axis direction and the Y-axis direction. Is done.
  • the surface facing the front side is a light emitting surface 19 a that emits internal light toward the light transmissive member 15 and the liquid crystal panel 11.
  • both end surfaces on the long side that are long along the X-axis direction are opposed to the LED 17 (LED substrate 18) with a predetermined space therebetween. These constitute a pair of light incident surfaces 19b on which the light emitted from the LEDs 17 is incident.
  • Each light incident surface 19b is a surface parallel to the X-axis direction (the LED 17 arrangement direction) and the Z-axis direction, that is, along the main plate surface of the LED substrate 18, and is a surface substantially orthogonal to the light emitting surface 19a.
  • the alignment direction of the LED 17 and the light incident surface 19b coincides with the Y-axis direction and is parallel to the light emitting surface 19a.
  • a predetermined space is held between the light incident surface 19 b of the light guide plate 19 and the LED 17, and a portion of the bottom plate 14 a of the chassis 14 facing the space, that is, on the frame 16 side.
  • the portion that sandwiches the LED 17 with the first light source sandwiching portion 16c is the second light source sandwiching portion 14d.
  • the second light source sandwiching portion 14d is disposed opposite to the LED 17 on the back side, that is, on the side opposite to the light emitting surface 19a side of the light guide plate 19.
  • a pair of second light source sandwiching portions 14d is arranged according to the arrangement of the pair of first light source sandwiching portions 16c and the pair of LEDs 17 (LED substrate 18).
  • a light scattering portion 21 that scatters light and a light scattering portion 21 that covers the light scattering portion 21 and reflects light are provided on a surface 19c of the light guide plate 19 opposite to the light emitting surface 19a.
  • a light reflection sheet (light guide reflection member) 22 is provided.
  • the light scattering portion 21 is provided by printing, for example, white ink on a surface 19c of the light guide plate 19 opposite to the light emission surface 19a.
  • the light scattering portion 21 scatters and reflects light from the light emission surface 19a. It is possible to prompt the emission.
  • printing means such as screen printing and ink jet printing can be employed.
  • the light scattering portion 21 is configured by dispersively arranging a large number of dots 21a made of white ink in a predetermined distribution in the surface 19c of the light guide plate 19 opposite to the light emitting surface 19a.
  • the area of each dot 21a changes according to the distance with respect to LED17 about the Y-axis direction (direction along the optical axis of LED17). Specifically, the area of each dot 21a forming the light scattering portion 21 is set so as to increase in the direction away from the LED 17 (light incident surface 19b) in the Y-axis direction and conversely decrease in the direction approaching the LED 17. It has become.
  • the degree of light scattering tends to increase as the area of each dot 21a increases, according to the configuration described above, in the portion of the light guide plate 19 close to the LED 17 having a relatively large amount of light, the light scattering portion. While light scattering by the light source 21 is suppressed, light scattering by the light scattering portion 21 is promoted at a portion far from the LED 17 where the amount of light inside is relatively large. Thereby, the emitted light from the light emitting surface 19a is uniformly distributed in the surface.
  • the area of each dot 21a forming the light scattering portion 21 and the degree of light scattering are substantially constant in the X-axis direction (the LED 17 arrangement direction) and hardly change.
  • the light guide reflection sheet 22 is made of a synthetic resin, and the surface of the light guide reflection sheet 22 exhibits a white color with excellent light reflectivity, similar to the first reflection sheet 20 described above.
  • the light guide reflection sheet 22 is disposed between the bottom plate 14a of the chassis 14 and the light guide plate 19, and directs the light scattered by the light scattering portion 21 toward the front side, that is, the light emitting surface 19a side. It is possible to start up efficiently.
  • the backlight device 12 having the above-described configuration includes a second reflecting sheet (reflecting member) 23 that faces the light incident surface 19 b of the light guide plate 19. Further, the second reflecting sheet 23 is provided with an extended reflecting portion 24 that extends toward the light incident surface 19 b side of the light guide plate 19. As shown in FIG. 6, the second reflection sheet 23 and the extended reflection portion 24 have an L-shaped cross section as a whole, and the second reflection sheet 23 has a predetermined Y axis direction between the light incident surface 19 b and the second reflection sheet 23. While extending in parallel to the light incident surface 19b while maintaining a distance, the extended reflecting portion 24 is first with a predetermined distance in the Z-axis direction between the first reflecting sheet 20 and the first reflecting sheet 20. The reflection sheet 20 extends in parallel.
  • the second reflection sheet 23 is made of a synthetic resin, and the surface of the second reflection sheet 23 exhibits a white color with excellent light reflectivity, similar to the first reflection sheet 20 and the light guide reflection sheet 22 described above. As shown in FIGS. 4 and 6, the second reflection sheet 23 is attached so as to overlap the mounting surface 18 a of the LED 17 on the LED substrate 18, and is integrated with the LED substrate 18 by an adhesive or a double-sided tape. . The light reflectance on the surface of the second reflective sheet 23 is relatively higher than the light reflectance on the mounting surface 18 a of the LED 17 of the LED substrate 18.
  • part (remaining part) of the light source opening part 23a in the 2nd reflection sheet 23 is set as the form which follows the non-arrangement pattern (light source non-arrangement area
  • the “LED 17 arrangement pattern” referred to here is a light source arrangement area that is an arrangement range of the LEDs 17 in the X-axis direction, that is, the arrangement direction of the LEDs 17 (overlapping with the LEDs 17 in the arrangement direction of the LEDs 17 (the positional relationship is matched). ) Light source overlapping area) LA.
  • the “non-arrangement pattern of LEDs 17” is a light source non-arrangement region that is a range in which the LEDs 17 are not arranged in the arrangement direction of the LEDs 17 (light sources that do not overlap with the LEDs 17 in the arrangement direction of the LEDs 17).
  • the light source openings 23a are intermittently arranged in parallel along the X-axis direction (the number of LEDs 17 in parallel), so that the light source openings in the second reflection sheet 23 are arranged.
  • a plurality of non-formed portions of the portion 23a are also intermittently arranged in parallel along the X-axis direction (the number obtained by adding 1 to the number of LEDs 17 in parallel).
  • part of the light source opening part 23a in the 2nd reflective sheet 23 and the light source opening part 23a are alternately arranged along with the X-axis direction.
  • part of the light source opening part 23a in the 2nd reflection sheet 23 is carrying out the stripe form extended along a Z-axis direction, and the structure which does not exist at all in the position (light source arrangement area LA) which overlaps LED17 about an X-axis direction It has become. That is, the 2nd reflective sheet 23 is not distribute
  • part of the mounting surface 18 a of the LED substrate 18 is exposed through the light source opening 23 a, but the light reflectance is relative to that of the second reflective sheet 23. Therefore, the first low light reflectance portion 25 is used (see FIG. 8).
  • part of the light source opening part 23a in the 2nd reflection sheet 23 is made into the 1st high light reflectance part 26 whose light reflectance is relatively higher than the 1st low light reflectance part 25 (refer FIG. 8). ).
  • the first low light reflectance portion 25 exposed through the light source opening 23a to the light source arrangement area LA where the LEDs 17 are arranged in the X-axis direction is provided.
  • the first high light reflectance part 26 that is the second reflection sheet 23 is arranged in the light source non-arrangement region LN that is not arranged.
  • the light reflected from the surface of the LED substrate 18 facing the light incident surface 19b and traveling toward the light incident surface 19b is not disposed in the light source arrangement area LA and the LED 17 in the X-axis direction.
  • the difference in the amount of light hardly occurs regardless of the light source non-arrangement region LN.
  • the extended reflector 24 Since the extended reflection portion 24 is integrally formed with the second reflection sheet 23, the material and the light reflectance of the surface thereof are the same as those of the second reflection sheet 23. As shown in FIG. 6, the extended reflecting portion 24 is, on the light incident surface 19 b side of the light guide plate 19 along the Y-axis direction from the back-side end portion of the second reflecting sheet 23 extending along the Z-axis direction. It is formed by extending toward The extended reflecting portion 24 extends along the bottom plate 14a of the chassis 14 and overlaps the surface on the LED 17 side of the second light source sandwiching portion 14d that sandwiches the LED 17 between the bottom plate 14a and the first light source sandwiching portion 16c.
  • the shape is maintained by being supported by the second light source sandwiching portion 14d.
  • the second light source sandwiching portion 14d in the chassis 14 is disposed so as to overlap the LED 17 with respect to the extended reflection portion 24 in the Z-axis direction.
  • the extended reflecting portion 24 is opposed to the first reflecting sheet 20 attached to the first light source sandwiching portion 16c at a predetermined interval, and repeats the light from the LED 17 with the first reflecting sheet 20.
  • the light can be incident on the light incident surface 19b while being efficiently reflected.
  • the extended reflecting portion 24 reaches a position where the extended tip portion exceeds the light incident surface 19 b of the light guide plate 19, that is, a position overlapping the light guide plate 19 in a plan view. Yes.
  • the extended distal end portion of the extended reflecting portion 24 is held in a state of being sandwiched between the light guide plate 19 and the bottom plate 14 a of the chassis 14.
  • the extended reflection portion 24 has a light reflectance relatively higher than that of the surface of the chassis 14 having the second light source sandwiching portion 14d.
  • the chassis 14 having the second light source sandwiching portion 14d is a low light reflectance member whose surface light reflectance is relatively lower than that of the extended reflection portion 24.
  • the extended reflecting portion 24 is extended from the second reflecting sheet 23, so that the LED 17 is not arranged in the X-axis direction in the same manner as the second reflecting sheet 23. It is arranged following a certain light source non-arrangement region LN.
  • the extended reflector 24 is formed with an opening 24a that follows the light source arrangement area LA that is the arrangement pattern of the LEDs 17 in the X-axis direction. Since a plurality of openings 24a (the number of LEDs 17 arranged in parallel) are intermittently arranged in parallel along the X-axis direction, the non-formation site of the opening 24a in the extended reflection section 24 is similarly arranged in the X-axis direction.
  • a plurality (a number obtained by adding 1 to the parallel number of the LEDs 17) are intermittently arranged in parallel.
  • part of the opening part 24a in the extended reflection part 24 and the opening part 24a are alternately arranged along the X-axis direction.
  • the opening 24 a is arranged at a position that overlaps at least the LED 17 in the extended reflection portion 24 in a plan view.
  • the opening 24a is formed in a range over the entire region excluding the extended tip portion on the light incident surface 19b side in the extended reflecting portion 24 in the Y-axis direction.
  • the extended reflecting portions 24 in which a plurality are intermittently arranged in parallel along the X-axis direction have a stripe shape extending along the Y-axis direction, and the extended tip portion extends along the X-axis direction.
  • the extension portions 27 are connected to each other.
  • the opening 24a communicates with the light source opening 23a formed in the second reflection sheet 23, and the opening fronts of the communicating portions are substantially equal to each other.
  • the opening 24a has a laterally long shape when seen in a plan view, and its long side dimension is slightly larger than the dimension in the X-axis direction of the LED 17, whereas the short side dimension is the LED substrate 18.
  • the distance between the mounting surface 18a and the light incident surface 19b is approximately equal.
  • the second low light reflectance portion 28 exposed through the opening 24a in the light source arrangement area LA where the LEDs 17 are arranged in the X-axis direction is not arranged on the surface of the second light source sandwiching portion 14d on the LED 17 side.
  • the second high light reflectance part 29 that is the extended reflection part 24 is arranged in the light source non-arrangement region LN.
  • the light that is reflected by the surface on the LED 17 side in the second light source sandwiching portion 14d and travels toward the light incident surface 19b is a non-arrangement pattern of the light source arrangement area LA and the LED 17 that is the arrangement pattern of the LED 17 in the X-axis direction.
  • a difference in the amount of light hardly occurs regardless of a certain light source non-arrangement region LN.
  • This embodiment has the structure as described above, and its operation will be described next.
  • the driving of the liquid crystal panel 11 is controlled by a control circuit (not shown) and the driving power from the LED driving circuit (not shown) is supplied to each LED 17 on the LED substrate 18.
  • the light from each LED 17 is guided by the light guide plate 19, so that the liquid crystal panel 11 is irradiated through the light transmissive member 15, 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 incident on the light incident surface 19b of the light guide plate 19 facing the LED 17, as shown in FIG.
  • the light incident on the light incident surface 19b is reflected by the light guide reflection sheet 22 while being scattered by the scattering portion 21 in the process of propagating through the light guide plate 19, so that it does not exceed the critical angle with respect to the light exit surface 19a.
  • the light By entering at an incident angle, the light is emitted from the light exit surface 19a to the outside on the front side.
  • the light emitted from the light emitting surface 19 a passes through the light transmissive member 15, is given a predetermined optical action, and then is emitted toward the liquid crystal panel 11.
  • the second reflection sheet 23 that follows the light source non-arrangement region LN that is the non-arrangement pattern of the LED 17 is used. Is attached to the surface of the LED 17 side of the second light source sandwiching portion 14d that sandwiches the LED 17 with the first light source sandwiching portion 16c, and is extended from the second reflective sheet 23 to the light incident surface 19b side. An extended reflection portion 24 that follows the light source non-arrangement region LN is disposed.
  • the light existing in the light source non-arrangement region LN which is the non-arrangement pattern of the LED 17 whose light amount tends to be relatively small, is incident on the light incident surface 19b.
  • the second reflection sheet 23 (first high light reflectance portion 26) and the extended reflection portion 24 (second high light reflectance portion 29) are arranged so as to follow the light source non-arrangement region LN. Is reflected.
  • the second reflection sheet 23 is formed with a light source opening 23a that follows the light source arrangement area LA that is the arrangement pattern of the LEDs 17, so that the LED substrate has a relatively lower light reflectance than the second reflection sheet 23.
  • the extended reflection portion 24 is formed with an opening 24a that follows the light source arrangement region LA.
  • the light existing in the light source non-arrangement area LA which is the arrangement pattern of the LEDs 17 that tends to have a relatively large amount of light, is both in the light source arrangement area LA. Reflection is suppressed by the first low light reflectance part 25 and the second low light reflectance part 28 to be copied. Therefore, the difference between the light source arrangement area LA and the light source non-arrangement area LN is less likely to occur in the amount of light incident on the light incident surface 19b of the light guide plate 19, and thus the light output from the light emission surface 19a of the light guide plate 19 is reduced. Luminance unevenness is less likely to occur in the incident light. Moreover, since the extended reflecting portion 24 is formed extending from the second reflecting sheet 23, the workability related to assembly can be improved.
  • the backlight device (illumination device) 12 is arranged in a state of being opposed to the plurality of LEDs (light sources) 17 arranged intermittently and the LEDs 17 and receives light from the LEDs 17.
  • a light guide plate 19 having an incident light incident surface 19b and a light emitting surface 19a for emitting incident light, and a non-arranged pattern of the LEDs 17 (light source non-arranged region LN) arranged to face the light incident surface 19b.
  • a second reflecting sheet (reflecting member) 23 that is arranged along with the extended reflecting portion 24 that extends from the second reflecting sheet 23 toward the light incident surface 19b side is provided.
  • the light emitted from the plurality of LEDs 17 enters the light incident surface 19b of the light guide plate 19 arranged to face the LEDs 17, and then propagates through the light guide plate 19 before being emitted from the light exit surface 19a.
  • the second reflective sheet 23 is disposed so as to face the light incident surface 19b and follows the non-arrangement pattern of the LED 17, and The light is efficiently reflected by the extended reflecting portion 24 that extends from the second reflecting sheet 23 toward the light incident surface 19b.
  • the amount of light incident on the light incident surface 19b of the light guide plate 19 depends on the arrangement pattern (light source arrangement area LA) and the non-arrangement pattern (light source non-arrangement area LN) in the plurality of LEDs 17 arranged intermittently. It becomes uniform and unevenness is less likely to occur. Thereby, luminance unevenness is less likely to occur in the light emitted from the light exit surface 19 a of the light guide plate 19. Moreover, since the extended reflection part 24 is formed extending from the second reflection sheet 23, workability related to assembly can be improved. According to this embodiment, luminance unevenness can be suppressed.
  • the second light source sandwiching portion (low light reflectance member) is disposed so as to overlap the side opposite to the LED 17 side with respect to the extended reflecting portion 24 and has a relatively lower light reflectance than the extended reflecting portion 24.
  • 14 d is provided, and the extended reflection portion 24 is formed with an opening 24 a that follows the arrangement pattern of the LEDs 17. In this way, light reflection is suppressed by the second light source sandwiching portion 14d exposed through the opening 24a that follows the arrangement pattern of the LEDs 17, thereby further increasing the amount of light incident on the light incident surface 19b of the light guide plate 19. Unevenness is less likely to occur.
  • the opening 24a is disposed at a position where the extended reflection portion 24 overlaps at least the LED 17 in a plan view. In this way, since the opening 24a is formed at a position where much of the light emitted from the LED 17 is irradiated in the extended reflecting portion 24, the second light source sandwiching portion 14d exposed through the opening 24a becomes excessive. It is possible to effectively suppress the reflection of light that tends to occur.
  • a light source opening 23a through which the LED 17 is passed is formed in the second reflection sheet 23 following the arrangement pattern of the LED 17, and the opening 24a communicates with the light source opening 23a.
  • the shapes of the second reflection sheet 23 and the extended reflection part 24 can be simplified compared to a case where the light source opening 23a and the opening 24a are configured not to communicate with each other. Can be. *
  • the opening 24a and the light source opening 23a have substantially the same opening fronts at the communicating portions. By doing so, it is possible to avoid the formation of a step in the communication portion between the opening 24a and the light source opening 23a, and thus the shapes of the second reflection sheet 23 and the extended reflection portion 24 are simplified. be able to.
  • an extended portion 27 extending across the opening 24 a along the arrangement direction of the LEDs 17 is provided at the end of the extended reflecting portion 24 on the light incident surface 19 b side.
  • the extended portion 27 makes the shape of the end of the extended reflecting portion 24 on the light incident surface 19b side simple, and therefore the handleability of the extended reflecting portion 24 is excellent.
  • a chassis 14 that houses the LEDs 17 and the light guide plate 19 is provided, and the extended reflection portion 24 is arranged so as to overlap the surface of the chassis 14 on the LED 17 side. In this way, the shape of the extended reflecting portion 24 can be maintained by the chassis 14 that houses the LEDs 17 and the light guide plate 19.
  • the extended reflecting portion 24 is formed so as to extend to a range overlapping with the light guide plate 19 in a plan view, and the overlapping portion is sandwiched between the light guide plate 19 and the chassis 14. In this way, the extended reflection part 24 can be stably held by sandwiching the extended reflection part 24 between the chassis 14 and the light guide plate 19.
  • an LED substrate (light source substrate) 18 on which a plurality of LEDs 17 are mounted is provided, and the second reflection sheet 23 is attached to the LED substrate 18.
  • the second reflection sheet 23 is difficult to be displaced with respect to the non-arrangement pattern of the LEDs 17. Yes.
  • the amount of light incident on the light incident surface 19b of the light guide plate 19 is less likely to be uneven.
  • a light scattering portion 21 that scatters light, and a light guide reflection sheet (light guide reflection member) that covers the light scattering portion 21 and reflects light. 22 is provided, and the light scattering portion 21 has a distribution in which the degree of light scattering is substantially constant in the arrangement direction of the LEDs 17. If it does in this way, the light which injected into the light-incidence surface 19b of the light-guide plate 19 will be reflected by the light-guide reflective sheet 22, being scattered by the light-scattering part 21 provided in the surface on the opposite side to the light-projection surface 19a. As a result, the light exits from the light exit surface 19a.
  • the light scattering unit 21 emits light from each LED 17 evenly regardless of the positional relationship of the LEDs 17 with respect to the arrangement direction of the LEDs 17 because the degree of light scattering is substantially constant with respect to the arrangement direction of the LEDs 17.
  • the light can be emitted from the surface 19a.
  • the light from LED17 is uniform irrespective of the arrangement pattern and non-arrangement pattern in LED17 by the above-mentioned 2nd reflective sheet 23 and the extended reflection part 24 in the step which injects into the light-incidence surface 19b of the light-guide plate 19. FIG. It has become difficult to produce unevenness.
  • Embodiment 1 of this invention was shown, this invention is not restricted to the said embodiment, For example, the following modifications can also be included.
  • members similar to those in the above embodiment are denoted by the same reference numerals as those in the above embodiment, and illustration and description thereof may be omitted.
  • the opening 24 a-1 has a horizontally long rectangular shape when viewed in a plane, while the LED 17 is viewed in a plane.
  • the non-overlapping portion has a substantially triangular shape when viewed in plan.
  • the portion of the opening 24a-1 that does not overlap with the LED 17 in a plan view has a base that extends along the X-axis direction and a pair of oblique sides that are inclined with respect to the X-axis direction and the Y-axis direction. It has an equilateral triangular shape, and the bottom side exists on the LED 17 side, whereas the intersection of a pair of oblique sides exists on the light incident surface 19b side.
  • the portion of the opening 24 a-1 that does not overlap with the LED 17 in a plan view is smaller in the area toward the direction away from the LED 17 in the Y-axis direction, and the opening front becomes narrower. As the area increases toward the surface, the opening front is widened. Therefore, the area of the second low-light-reflecting part 28-1 configured by the second light source sandwiching part 14d of the chassis 14 exposed through the opening 24a-1 is small in the direction away from the LED 17 in the Y-axis direction. On the other hand, the area of the second high light reflectivity portion 29-1 constituted by the extended reflection portion 24-1 increases in the direction away from the LED 17.
  • the light emitted from the LED 17 tends to spread as the distance from the LED 17 increases, and unevenness tends to be alleviated. Therefore, in the surface facing the LED 17 in the second light source sandwiching portion 14d, light is emitted by the second low light reflectance portion 28-1 having a larger area than the second high light reflectance portion 29-1 at a position relatively close to the LED 17. By effectively suppressing the reflection of the light, a high unevenness suppressing effect can be obtained. On the other hand, on the surface facing the LED 17 in the second light source sandwiching portion 14d, light is emitted by the second high light reflectance portion 29-1 having a larger area than the second low light reflectance portion 28-1 at a position relatively far from the LED 17. The luminance is improved by increasing the efficiency of reflection.
  • the opening 24 a-1 is configured such that the area thereof decreases in the direction away from the LED 17.
  • the exposed area of the second light source sandwiching portion 14d exposed through the opening 24a-1 decreases in the direction away from the LED 17, while the extended reflecting portion 24-1 moves away from the LED 17.
  • the area increases in the direction.
  • the light emitted from the LED 17 tends to spread as the distance from the LED 17 increases and the unevenness is alleviated. Therefore, reflection of light is mainly suppressed by the second light source sandwiching portion 14d at a position relatively close to the LED 17.
  • the luminance can be improved by improving the efficiency of light reflection mainly by the extended reflection portion 24-1 at a position relatively far from the LED 17 while effectively suppressing unevenness.
  • the opening 24a-1 has an inclined edge so that the opening front becomes narrower in the direction away from the LED 17.
  • the edge of the opening 24a-1 in an inclined shape, the exposed area of the second light source sandwiching portion 14d continuously decreases gradually in the direction away from the LED 17, whereas the extended reflection. Since the area of the portion 24-1 increases gradually and gradually in the direction away from the LED 17, it is possible to improve luminance while suppressing unevenness more effectively.
  • the opening 24 a-2 has a horizontally long rectangular shape when viewed in a plane, while the LED 17 is viewed in a plane.
  • the non-overlapping portion has a substantially semicircular shape when viewed in plan. Accordingly, the portion of the opening 24a-2 that does not overlap with the LED 17 in a plan view has a straight base and an arcuate side that forms an arc, and the base is on the LED 17 side.
  • the arc-shaped side exists on the light incident surface 19b side, and the light incident surface 19b is arranged at a position tangent to the arc-shaped side.
  • the portion of the opening 24a-2 that does not overlap with the LED 17 in a plan view is smaller in the area away from the LED 17 in the Y-axis direction, and the opening front is narrower. As the area increases toward the surface, the opening front is widened. Since other operations and effects are the same as those of the first modification of the first embodiment described above, a duplicate description is omitted.
  • Embodiment 2 A second embodiment of the present invention will be described with reference to FIG. 11 or FIG. In this Embodiment 2, what changed the form of the extended reflection part 124 and the opening part 124a is shown. In addition, the overlapping description about the same structure, an effect
  • the extended reflecting portion 124 is a non-arranged pattern of the LEDs 17 in the X-axis direction (the direction in which the LEDs 17 are arranged) on the surface of the second light source sandwiching portion 14d on the LED 17 side.
  • the light source arrangement area LA that is the arrangement pattern of the LEDs 17.
  • the opening 124a disposed in the light source arrangement area LA in the X-axis direction is formed at a position overlapping with the LED 17 when viewed in a plane, but does not overlap with the LED 17 when viewed in a plane.
  • the third low light reflectance part (low light reflectance printing part) 30 is provided by printing a low light reflectance material having a relatively low value.
  • the third low light reflectance portion 30 is a material exhibiting black as a low light reflectance material, and is provided on the surface of the extended reflection portion 124 by printing means such as screen printing or ink jet printing. .
  • the third low light reflectance portion 30 is configured by three circular printing portions 30a that are circular in a plan view. Specifically, the third low light reflectance portion 30 is disposed at a position on the LED 17 side in the Y-axis direction and aligned with the X-axis direction, and a position on the light incident surface 19b side in the Y-axis direction. And a single circular printing unit 30a arranged at an intermediate position between a pair of circular printing units 30a arranged in the X-axis direction in the X-axis direction.
  • the second high light reflectivity portion 129 is configured by a non-formation portion in which the third low light reflectivity portion 30 is not formed in the extended reflection portion 124.
  • the light reflectance related to the surface on the LED 17 side in the second light source sandwiching portion 14d is relatively high by the second high light reflectance portion 129 in the light source non-arranged region LN that is the non-arranged pattern of the LED 17.
  • the third low light printed on the surface of the extended reflection section 124 in addition to the second low light reflectance section 128 exposed through the opening 124a is relatively low due to the reflectance part 30.
  • the light existing in the light source non-arrangement region LN in which the light amount tends to be relatively small, is incident on the light incident surface 19b.
  • the light is efficiently reflected by the second high light reflectance portion 129 of the extended reflection portion 124 that is arranged following the light source non-arrangement region LN.
  • the light existing in the light source arrangement region LN which tends to have a relatively large amount of light, is distributed following the light source arrangement region LA before entering the light incident surface 19b.
  • the reflection is suppressed by the second low light reflectance unit 128 and the third low light reflectance unit 30.
  • the extended reflection part 124 is arranged in a range that follows the arrangement pattern of the LED 17 in addition to the non-arrangement pattern of the LED 17, and the extended reflection part 124 has a light reflectance.
  • a third low light reflectance part (low light reflectance printing part) 30 that follows the arrangement pattern of the LEDs 17 is provided by printing a relatively low low light reflectance material. In this way, the non-formed part where the third low light reflectance part 30 that follows the arrangement pattern of the LED 17 in the extended reflection part 124 is not formed is assumed to follow the non-placement pattern of the LED 17.
  • the reflection of light is suppressed by the third low light reflectance portion 30 that follows the arrangement pattern of the LEDs 17, whereas the reflection of light is not performed by the portion where the third low light reflectance portion 30 is not formed in the extended reflection portion 124.
  • the amount of light incident on the light incident surface 19b of the light guide plate 19 is further less likely to be uneven.
  • Embodiment 2 of this invention was shown, this invention is not restricted to the said embodiment, For example, the following modifications can also be included.
  • members similar to those in the above embodiment are denoted by the same reference numerals as those in the above embodiment, and illustration and description thereof may be omitted.
  • the third low light reflectance portion 30-1 is configured by a large number of dots 30 b made of a low light reflectance material, and the dot 30 b group as a whole is a semicircle. It is arranged in the shape area.
  • the third low light reflectance portion 30-1 has a linear base on the light incident surface 19b side, whereas an arc-shaped side on the LED 17 side. . Therefore, the area of the third low light reflectance portion 30-1 increases as it approaches the center position of the LED 17 in the X-axis direction, while the area decreases as it moves away from the center position of the LED 17. Is done.
  • the third low light reflectance portion 30-1 has a center position substantially coincident with the center position of the LED 17 in the X-axis direction.
  • the third low light reflectance portion 30-1 has a formation range in the X-axis direction substantially the same as that of the LED 17 (light source arrangement area LA), and the entire area in the X-axis direction is the LED 17 (light source arrangement area LA). And the positional relationship overlapping.
  • the area of the third low light reflectance portion 30-1 decreases as it approaches the LED 17 in the Y-axis direction, and increases as it moves away from the LED 17. That is, the third low light reflectance portion 30-1 is configured such that the dimension in the X-axis direction gradually increases toward the direction away from the LED 17 in the Y-axis direction.
  • the area and arrangement interval of the dots 30b constituting the third low light reflectance portion 30-1 are substantially constant. That is, since the distribution density of the dots 30b constituting the third low third low light reflectance portion 30-1 is substantially constant, the light reflectance in the third low light reflectance portion 30-1 is It is almost constant over the entire area. Even with such a configuration, a difference between the light source arrangement area LA and the light source non-arrangement area LN hardly occurs in the amount of light incident on the light incident surface 19b of the light guide plate 19.
  • the third low light reflectance unit 30-2 is configured so that the light reflectance changes in a gradation with respect to the alignment direction (X-axis direction) of the LEDs 17. ing. Specifically, in the third low light reflectance unit 30-2, the light reflectance continuously increases gradually in the direction away from the central position of the LED 17 in the X-axis direction, and conversely approaches the central position of the LED 17. The light reflectance is continuously decreased gradually toward the direction. Therefore, as shown in FIG. 14, the large number of dots 30b-2 constituting the third low light reflectance portion 30-2 are arranged at the central position of the LED 17 in the X-axis direction and have the largest area.
  • the pattern is formed such that the area continuously and gradually decreases as the distance from the X-axis direction increases.
  • the light reflectance in the third low light reflectance portion 30-2 changes in a slope shape in the X-axis direction as shown in FIG. Note that the light reflectance in the third low light reflectance portion 30-2 is substantially constant in the Y-axis direction.
  • the third low light reflectance portion 30-3 according to the present modification is configured such that the light reflectance changes in a curved shape in the arrangement direction (X-axis direction) of the LEDs 17.
  • the third low light reflectance portion 30-4 is configured such that the light reflectance changes in a stripe shape in the arrangement direction (X-axis direction) of the LEDs 17. That is, in the third low light reflectance unit 30-4, the light reflectance gradually increases in the X-axis direction toward the direction away from the central position of the LED 17, and conversely toward the direction approaching the central position of the LED 17. Thus, the light reflectance is gradually decreased step by step.
  • Modification 5 of Embodiment 2 will be described with reference to FIG. Here, what changed the aspect of the 3rd low light reflectance part 30-5 is shown.
  • the third low light reflectance portion 30-5 is formed by printing a low light reflectance material in a solid shape on the surface of the extended reflection portion 124-5. ing. In this way, the light reflectance of the third low light reflectance portion 30-5 is even lower than those described in the second embodiment and the first to fourth modifications thereof.
  • the third low light reflectance portion 30-6 has a trapezoidal shape when seen in a plane as shown in FIG.
  • the pair of opposite sides are parallel to the LED 17 arrangement direction (X-axis direction), of which the upper base is on the LED 17 side and the lower base is the light incident surface. It is arranged on the 19b side. That is, the third low light reflectance portion 30-6 is configured such that the dimension in the X-axis direction gradually increases toward the direction away from the LED 17 in the Y-axis direction.
  • the extended reflection portion is disposed so as to overlap the surface on the LED side in the second light source sandwiching portion (chassis) disposed on the side opposite to the light emitting surface side.
  • the present invention includes a configuration in which the extended reflection portion is arranged so as to overlap the surface on the LED side in the first light source sandwiching portion (frame) arranged on the light emitting surface side. In that case, what is necessary is just to make it attach to a 2nd light source clamping part about a 1st reflective sheet.
  • the second reflection sheet has a configuration in which the second reflection sheet is not arranged at all in the light source arrangement region (LED arrangement pattern) in the X-axis direction. If secured, a part of the second reflection sheet may be arranged on the light source arrangement region side. For example, it is possible to take the structure which connects each 1st high light reflectance part which makes a 2nd reflective sheet by a bridge
  • the extension tip portion of the extension reflection portion is configured to overlap with the light guide plate in plan view.
  • the extension tip portion of the extension reflection portion is viewed in plan view with the light guide plate.
  • the present invention includes a configuration that does not overlap (a configuration in which the extended reflection portion is not sandwiched between the chassis and the light guide plate). In that case, it is possible to make the extended tip of the extended reflector part flush with the light incident surface of the light guide plate, or to make the extended tip of the extended reflector not reach the light incident surface of the light guide plate. It is.
  • the light source opening portion of the second reflection sheet and the opening portion of the extended reflection portion have the same opening front in the communication portion. It is also possible to vary the opening front at the communication part.
  • the specific planar shape of the opening and the light source opening can be changed as appropriate.
  • the planar shape of the opening and the light source opening can be changed to a polygon other than a square or a rectangle.
  • the shape triangular shape, pentagonal shape), trapezoidal shape, elliptical shape, oval shape, or the like can be used.
  • the second reflection sheet and the extended reflection portion exhibiting white are used is shown.
  • the second reflection sheet and the extension reflection exhibiting a color other than white for example, silver or gray. It is also possible to use parts.
  • the extension reflection portion is provided with the opening and the third low light reflectance portion is provided.
  • the extension reflection portion is provided with only the third low light reflectance portion. It may be provided, and the opening may not be provided.
  • the planar shape of the third low light reflectance portion can be changed as appropriate.
  • the planar shape of the third low light reflectance portion can be a divergent shape such as a triangular shape, a semi-elliptical shape, and a semi-ellipse shape, and other polygonal shapes (square, pentagon, etc.) Alternatively, a circular shape, an elliptical shape, or the like can be used.
  • the third low light reflectance part can be asymmetrical.
  • the low light reflectance part is formed by printing the low light reflectance material on the surface of the extended reflection part. It is also possible to form the third low light reflectance part by applying a material.
  • the present invention includes other means using other forming means such as metal vapor deposition.
  • a pair of LED substrates is arranged at the ends of both long sides of the light guide plate.
  • the LED substrates are both short sides of the light guide plate. What is arranged in a pair at the end portion on the side is also included in the present invention.
  • LED substrates In addition to the above (15), a pair of LED substrates (LEDs) arranged on both ends of the long side and both short sides of the light guide plate, and conversely, LED substrates (LEDs).
  • the present invention includes one in which only one long side or one short side of the light guide plate is disposed at the end.
  • the color filters of the color filter included in the liquid crystal panel are exemplified by three colors of R, G, and B.
  • the color sections can be four or more colors.
  • an LED is used as a light source.
  • other light sources such as an organic EL can be used.
  • 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.
  • 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 ... Backlight device (illumination device), 14 ... Chassis, 14d ... 2nd light source clamping part (Low light reflectance member), 17 ... LED (light source), 18 ... LED substrate (light source substrate), 19 ... light guide plate, 19a ... light emitting surface, 19b ... light incident surface , 19c ... surface, 21 ... light scattering portion, 22 ... light guide reflection sheet (light guide reflection member), 23 ... second reflection sheet (reflection member), 23a ... light source opening 24 ... extended reflection part, 24a ... opening part, 27 ... extension part, 30 ... third low light reflectance part (low light reflectance printing part), LA ... light source arrangement Area (light source arrangement pattern), LN ... light source non-arrangement area (light source non-arrangement pattern), TV ... TV receiver

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

L'invention porte sur un dispositif de rétro-éclairage (dispositif d'éclairage) (12), lequel dispositif comprend : une pluralité de DEL (sources de lumière) (17) disposées par intermittence côte à côte ; une plaque de guidage de lumière (19) ayant des surfaces d'incidence de lumière (19b) faisant face aux DEL (17) et recevant une lumière à partir des DEL (17), et une surface d'émission de lumière (19a) qui permet à la lumière incidente de sortir ; des secondes feuilles réfléchissantes (éléments réfléchissants) (23) faisant face aux surfaces d'incidence de lumière (19b), et disposées de façon à correspondre au motif des régions dans lesquelles les DEL (17) ne sont pas disposées (régions de non disposition de sources de lumière (LN)) ; et des parties de réflexion étendues (24) qui s'étendent à partir des secondes feuilles réfléchissantes (23) vers les surfaces d'incidence de lumière (19b).
PCT/JP2012/064261 2011-06-09 2012-06-01 Dispositif d'éclairage, dispositif d'affichage et dispositif de réception de télévision WO2012169439A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-129361 2011-06-09
JP2011129361 2011-06-09

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WO2012169439A1 true WO2012169439A1 (fr) 2012-12-13

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3279549A4 (fr) * 2015-04-01 2018-12-12 Sharp Kabushiki Kaisha Dispositif d'éclairage, dispositif d'affichage, et dispositif de réception de télévision

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003331628A (ja) * 2002-03-05 2003-11-21 Seiko Epson Corp 照明装置、液晶装置及び電子機器
JP2008218325A (ja) * 2007-03-07 2008-09-18 Nippon Leiz Co Ltd 導光板および平面照明装置
JP2009004198A (ja) * 2007-06-20 2009-01-08 Alpine Electronics Inc 液晶パネルバックライト装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003331628A (ja) * 2002-03-05 2003-11-21 Seiko Epson Corp 照明装置、液晶装置及び電子機器
JP2008218325A (ja) * 2007-03-07 2008-09-18 Nippon Leiz Co Ltd 導光板および平面照明装置
JP2009004198A (ja) * 2007-06-20 2009-01-08 Alpine Electronics Inc 液晶パネルバックライト装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3279549A4 (fr) * 2015-04-01 2018-12-12 Sharp Kabushiki Kaisha Dispositif d'éclairage, dispositif d'affichage, et dispositif de réception de télévision

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