WO2013042602A1 - Dispositif d'éclairage et dispositif d'affichage doté de ce dernier - Google Patents

Dispositif d'éclairage et dispositif d'affichage doté de ce dernier Download PDF

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Publication number
WO2013042602A1
WO2013042602A1 PCT/JP2012/073404 JP2012073404W WO2013042602A1 WO 2013042602 A1 WO2013042602 A1 WO 2013042602A1 JP 2012073404 W JP2012073404 W JP 2012073404W WO 2013042602 A1 WO2013042602 A1 WO 2013042602A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
scattering
guide plate
light guide
dot
Prior art date
Application number
PCT/JP2012/073404
Other languages
English (en)
Japanese (ja)
Inventor
健太郎 鎌田
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 WO2013042602A1 publication Critical patent/WO2013042602A1/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
    • G02B6/0033—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
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along 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
    • G02B6/0081—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

Definitions

  • the present invention relates to a lighting device and a display device including the same, and more particularly to a lighting device including a light guide plate on which light from a light source is incident and a display device including the same.
  • a liquid crystal display device (display device) on which a non-luminous display panel (illuminated member) is mounted is usually also equipped with a backlight device (illumination device) that emits light to the display panel.
  • a backlight device including a plurality of LEDs (light sources) and a light guide plate on which light from the LEDs is incident is known.
  • the display device 1001 includes a display panel (illuminated member) 1002 and a backlight device (illumination device) 1010 that illuminates the display panel 1002.
  • the backlight device 1010 includes a plurality of LEDs (light sources) 1011, a light guide plate 1012 on which light from the LEDs 1011 is incident, a plurality of optical sheets 1013 disposed on the light emitting surface 1012 a side of the light guide plate 1012, and a light guide plate 1012 includes a reflection sheet 1014 disposed on the back surface 1012b side of 1012 and a chassis 1015 for housing these.
  • the light guide plate 1012 is the widest surface and has a light emitting surface 1012a provided on the display panel 1002 side, a back surface 1012b provided on the opposite side of the light emitting surface 1012a, and an LED 1011 facing each other and the A direction. And a side surface 1012d extending in a direction intersecting the light incident side surface 1012c (direction B).
  • the light exit surface 1012a of the light guide plate 1012 has a plurality of light that scatters the light incident on the light incident side surface 1012c, changes the traveling direction, and emits light from the light exit surface 1012a to the display panel 1002 side.
  • the scattering dot (scattering part) 1012e is formed.
  • the amount of light emitted from the light guide plate decreases as the distance from the LED (light source) increases.
  • the plurality of scattering dots 1012e are formed so that the outer shape (diameter) increases as the distance from the LED 1011 increases. Thereby, it is possible to suppress a decrease in luminance at the center of the screen.
  • Patent Document 1 a display device including a light guide plate having the above-described structure is disclosed in Patent Document 1, for example.
  • the amount of light emitted from the portion S1001 between the adjacent LEDs 1011 at the edge portion of the light guide plate 1012 is smaller than the amount of light emitted from the front portion S1002 of the LED 1011. For this reason, since the part S1001 becomes dark on the screen, there is a problem that it is difficult to improve the uniformity of the luminance at the peripheral edge of the screen.
  • the portion S1001 becomes dark on the screen is likely to occur when the LEDs 1011 are arranged close to the light guide plate 1012 or the arrangement pitch of the LEDs 1011 is increased. Further, the dark portion S1001 becomes wider as approaching the outside of the light guide plate 1012 (on the light incident side surface 1012c side), for example, as indicated by a two-dot chain line in FIG.
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a lighting device capable of improving the uniformity of luminance at the peripheral edge of the screen and a display device including the same. Is to provide.
  • an illumination device includes a plurality of light sources arranged in a predetermined direction, a light incident side surface on which light from the light sources is incident, and light emission for emitting light toward an illuminated member. And a light guide plate including a back surface disposed on the side opposite to the light output surface, and the light output surface or back surface of the light guide plate scatters light incident on the light incident side surface to scatter the light output surface.
  • a plurality of scattering portions to be emitted from the light source are provided, and the plurality of scattering portions are arranged at a uniform pitch in a predetermined direction, and the plurality of scattering portions are first provided at the edge of the light guide plate and in front of the light source.
  • a scattering portion and a second scattering portion provided between adjacent light sources and having an outer shape larger than that of the first scattering portion, and the arrangement pitch of the light sources in a predetermined direction is 2 of the arrangement pitch of the scattering portions in the predetermined direction. Equal to an integer multiple of
  • the front of the light source means the light emission direction of the light source.
  • the plurality of scattering portions are provided at the edge of the light guide plate between the first scattering portion provided in front of the light source and between the adjacent light sources, than the first scattering portion. And a second scattering portion having a large outer shape.
  • the arrangement pitch of the light sources is equal to an integer multiple of 2 or more of the arrangement pitch of the scattering portions.
  • the scattering portion may be formed in a dot shape.
  • the plurality of scattering portions form a plurality of dot rows arranged at a predetermined arrangement pitch in a predetermined direction, and 1 from the light incident side surface side.
  • the number of the second scattering portions of the dot row arranged in the row is larger than the number of the second scattering portions of the dot row arranged in the second row from the light incident side surface side.
  • the scattering portion provided in the region farthest from the light source has a larger outer shape than the second scattering portion. If comprised in this way, since it can suppress that the quantity of the light radiate
  • the scattering portion includes irregularities formed on the light emitting surface or the back surface of the light guide plate. If comprised in this way, a scattering part can be provided easily.
  • the unevenness is a concept including a structure having only concave portions and a structure having only convex portions.
  • the scattering portion includes a reflective layer provided on the back surface of the light guide plate. If comprised in this way, a scattering part can be provided easily.
  • the display device of the present invention includes the illumination device having the above-described configuration and a display panel illuminated by the illumination device. If comprised in this way, the display apparatus which can improve the uniformity of the brightness
  • an illuminating device capable of improving the uniformity of luminance at the peripheral edge of the screen and a display device including the same.
  • FIG. 11 is an enlarged view for explaining a dark portion generated between adjacent light sources at the edge portion of the light guide plate of the conventional display device shown in FIG. 10.
  • the display device 1 is used in, for example, a television receiver.
  • the display device 1 includes a display panel 2 (illuminated member) and a lighting device 10 that is disposed on the back side of the display panel 2 and illuminates the display panel 2.
  • the “back side (lower side in FIG. 1)” of the “back side of the display panel 2” is an orientation concept that is also applied to other components.
  • the display panel 2 is composed of a liquid crystal display panel, and has two glass substrates that sandwich a liquid crystal layer (not shown).
  • the display panel 2 displays an image by being illuminated by the illumination device 10.
  • the lighting device 10 is an edge light type (also referred to as a side light type) backlight device.
  • the lighting device 10 includes a plurality of light sources 11, a light guide plate 12 that guides light from the light sources 11, a plurality of optical sheets 13 that are disposed on the light emission surface 12 a side of the light guide plate 12, and the back surface of the light guide plate 12.
  • the reflective sheet 14 arrange
  • the plurality of light sources 11 are disposed to face a light incident side surface 12 c described later of the light guide plate 12. In other words, the plurality of light sources 11 are arranged along two opposing sides of the light guide plate 12. The plurality of light sources 11 are arranged at predetermined intervals in the A direction (longitudinal direction of the light guide plate 12).
  • the light source 11 is composed of an LED, for example, and emits white light.
  • the direction A is an example of the “predetermined direction” in the present invention.
  • the arrangement pitch P1 in the A direction of the light source 11 is equal to two or more integer multiples (for example, six times) of the arrangement pitch P2 in the A direction of scattering dots 12e described later.
  • the light guide plate 12 is formed in a flat plate shape using a material having a refractive index greater than 1, as shown in FIGS.
  • the light guide plate 12 is the widest surface and emits planar light toward the display panel 2, a back surface 12b provided on the opposite side of the light output surface 12a, and light from the light source 11. Is incident on the light incident side surface 12c (the long side of the light guide plate 12) and the side surface 12d (the light guide plate 12) extending in a direction orthogonal to (intersecting) the light incident side surface 12c (the B direction which is the short direction of the light guide plate 12). Short side).
  • the light guide plate 12 has a function of guiding light incident on the light incident side surface 12 c and emitting planar light toward the display panel 2 by changing the traveling direction of the light.
  • a plurality of (a plurality of) scattering dots 12e scattering that change the traveling direction of the light incident on the light incident side surface 12c and emit light from the light emitting surface 12a to the display panel 2 side. Part) is formed.
  • the number of scattering dots 12e is reduced and the scattering dots 12e are drawn larger.
  • the scattering dots 12e are concave portions or convex portions formed on the back surface 12b of the light guide plate 12, for example, as shown in FIGS.
  • the scattering dots 12e may be concave portions or convex portions formed on the light emitting surface 12a of the light guide plate 12 although not shown.
  • the concave portion or the convex portion may be formed in a hemispherical shape, for example, or may be formed in a quadrangular pyramid shape or other shapes. Further, instead of a dot shape such as a hemispherical shape or a quadrangular pyramid shape, for example, a prism-shaped scattering portion may be formed.
  • the scattering dots 12e may be a reflective layer provided on the back surface 12b of the light guide plate 12, as shown in FIG.
  • the reflective layer may be formed of, for example, white ink or may be formed of other materials.
  • the plurality of scattering dots 12e are arranged in a plurality of rows extending along the A direction.
  • the scattering dots 12e constitute a plurality of dot rows 12f arranged at a uniform pitch (arrangement pitch P2) in the A direction, and the plurality of dot rows 12f are predetermined in the B direction.
  • the dot row 12f is arranged so as to be shifted by half the pitch in the A direction with respect to the adjacent dot row 12f. For this reason, the plurality of scattering dots 12e are arranged in a staggered manner.
  • the scattering dot 12 g (second scattering part) provided between the adjacent light sources 11 is larger than the scattering dot 12 h (first scattering part) provided in front of the light source 11. It has a diameter (outer shape).
  • the number of scattering dots 12g arranged in the first row (outermost row) from the light incident side surface 12c side is the second row from the light incident side surface 12c side ( More than the number of scattering dots 12g arranged in the second row from the outside (for example, three between adjacent light sources 11).
  • the scattering dot 12e is formed to have a larger diameter (outer shape) as it moves away from the light source 11 (toward the inside of the light guide plate 12). As shown in FIG. 2, the scattering dot 12e provided in the region S1 farthest from the light source 11 (the center portion of the light guide plate 12) has a larger diameter (outer shape) than the scattering dot 12g.
  • the scattering dots 12g are provided from the outside to the second row, but the scattering dots 12g may also be provided from the outside to the third row and thereafter.
  • each light source 11 the positional relationship between the light source 11 and the scattering dots 12e is the same. Further, the scattering dots 12e are arranged so as to be symmetric with respect to each light source 11 in the A direction.
  • the plurality of optical sheets 13 are composed of a diffusion plate, a prism sheet, a lens sheet, and the like, and have a function of diffusing light from the light guide plate 12 and condensing it at a predetermined viewing angle.
  • the diffusion plate, the prism sheet, the lens sheet, and the like are provided as necessary and may be omitted.
  • the reflection sheet 14 has a function of reflecting the light emitted from the back surface 12 b of the light guide plate 12 and causing the light to enter the light guide plate 12 again.
  • the plurality of scattering dots 12e are arranged between the scattering dots 12h provided in front of the light source 11 and the adjacent light sources 11 at the edge of the light guide plate 12.
  • the arrangement pitch P1 of the light source 11 in the A direction is equal to an integer multiple of 2 or more of the arrangement pitch P2 of the scattering dots 12e in the A direction.
  • the plurality of scattering dots 12e form a plurality of dot rows 12f arranged at a predetermined arrangement pitch P2 in the A direction, and are arranged in the first row from the light incident side surface 12c side.
  • the number of scattering dots 12g in the row 12f (for example, four between adjacent light sources 11) is the number of scattering dots 12g in the dot row 12f arranged in the second row from the light incident side surface 12c side (adjacent light sources 11). More than 3) between each other.
  • the scattering dot 12e provided in the region S1 farthest from the light source 11 has a larger diameter (outer shape) than the scattering dot 12g.
  • the plurality of light sources 11 are arranged along only one side (one long side) of the light guide plate 12.
  • the scattering dots 12g and 12h are provided on one long side of the light guide plate 12 (on the light incident side surface 12c side), but are not provided on the other long side of the light guide plate 12.
  • the scattering dot 12e is formed to have a larger outer shape as it moves away from the light source 11 (toward the lower side of the light guide plate 12 in FIG. 7).
  • the scattering dot 12e provided in the region (the lower part in FIG. 7) S11 farthest from the light source 11 has a larger outer shape than the scattering dot 12g.
  • the scattering dots 12e are arranged in a matrix. That is, the dot row 12f is arranged so as not to be displaced in the A direction with respect to the adjacent dot row 12f.
  • the number of scattering dots 12g arranged in the first row from the light incident side surface 12c side is the scattering dot arranged in the second row from the light incident side surface 12c side. More than 12g (for example, two between adjacent light sources 11). As shown in FIG. 9, the number of scattering dots 12g arranged in the first row from the light incident side surface 12c and the number of scattering dots 12g arranged in the second row from the light incident side surface 12c are the same. It may be.
  • the present invention is not limited thereto, and may be applied to a display panel other than the liquid crystal display panel.
  • the backlight apparatus which illuminates a display panel was demonstrated as an example of an illuminating device, this invention is applicable not only to this but the illuminating device which illuminates to-be-illuminated members other than a display panel. is there.
  • the present invention is not limited to this, and the plurality of light sources are arranged along the four sides of the light guide plate. It may be arranged.
  • the number of scattering dots 12g arranged in the first row from the light incident side surface side is greater than or equal to the number of scattering dots 12g arranged in the second row from the light incident side surface side.
  • the number of scattering dots 12g arranged in the first row from the light incident side surface may be smaller than the number of scattering dots 12g arranged in the second row from the light incident side surface.
  • Display device 2 Display panel (illuminated member) DESCRIPTION OF SYMBOLS 10 Illuminating device 11 Light source 12 Light guide plate 12a Light emission surface 12b Back surface 12c Light incident side surface 12e Scattering dot (scattering part) 12f dot row 12g scattering dot (second scattering part) 12h Scattering dots (first scattering part) P1 arrangement pitch P2 arrangement pitch (pitch) S1, S11 Distant area

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

Abstract

La présente invention se rapporte à un dispositif d'éclairage qui peut améliorer l'uniformité de luminosité au niveau des bords d'un écran. Ce dispositif d'éclairage (10) est doté, sur une plaque de guidage de lumière (12), de plusieurs points de diffusion (12e) qui diffusent la lumière et font sortir la lumière d'une surface de sortie de lumière (12a). Les multiples points de diffusion comprennent, sur la partie bord de la plaque de guidage de lumière, des points de diffusion (12h) situés sur la surface tournée vers la source de lumière (11) et des points de diffusion (12g) situés entre les sources de lumière et ayant une forme externe plus grande que les points de diffusion (12h). Le pas de disposition (P1) des sources de lumière est égal à un entier multiple de 2 ou supérieur au pas de disposition (P2) des points de diffusion (12e).
PCT/JP2012/073404 2011-09-20 2012-09-13 Dispositif d'éclairage et dispositif d'affichage doté de ce dernier WO2013042602A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011204837 2011-09-20
JP2011-204837 2011-09-20

Publications (1)

Publication Number Publication Date
WO2013042602A1 true WO2013042602A1 (fr) 2013-03-28

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008311090A (ja) * 2007-06-14 2008-12-25 Citizen Electronics Co Ltd 導光板の製造方法、導光板及びバックライトユニット並びに表示装置
JP2009158479A (ja) * 2007-12-06 2009-07-16 Sony Corp 面発光装置、導光板および導光板の製造方法
WO2009145319A1 (fr) * 2008-05-29 2009-12-03 京セラ株式会社 Dispositif de source de lumière et unité d'affichage équipée du dispositif de source de lumière
JP2010251050A (ja) * 2009-04-14 2010-11-04 Sumitomo Bakelite Co Ltd 導光板および面発光装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008311090A (ja) * 2007-06-14 2008-12-25 Citizen Electronics Co Ltd 導光板の製造方法、導光板及びバックライトユニット並びに表示装置
JP2009158479A (ja) * 2007-12-06 2009-07-16 Sony Corp 面発光装置、導光板および導光板の製造方法
WO2009145319A1 (fr) * 2008-05-29 2009-12-03 京セラ株式会社 Dispositif de source de lumière et unité d'affichage équipée du dispositif de source de lumière
JP2010251050A (ja) * 2009-04-14 2010-11-04 Sumitomo Bakelite Co Ltd 導光板および面発光装置

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