WO2012157485A1 - Dispositif d'éclairage et dispositif d'affichage - Google Patents

Dispositif d'éclairage et dispositif d'affichage Download PDF

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Publication number
WO2012157485A1
WO2012157485A1 PCT/JP2012/061856 JP2012061856W WO2012157485A1 WO 2012157485 A1 WO2012157485 A1 WO 2012157485A1 JP 2012061856 W JP2012061856 W JP 2012061856W WO 2012157485 A1 WO2012157485 A1 WO 2012157485A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
guide plate
light guide
mounting
fixing member
Prior art date
Application number
PCT/JP2012/061856
Other languages
English (en)
Japanese (ja)
Inventor
正人 尾上
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 WO2012157485A1 publication Critical patent/WO2012157485A1/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
    • G02B6/0081—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 and a display device, and particularly to a lighting device and a display device including a light source and a light guide plate.
  • a liquid crystal display device equipped with a non-luminous display panel is also equipped with a backlight device (illumination device) that irradiates light to the display panel.
  • a backlight device including a plurality of LEDs (Light Emitting Diodes) (light source) and a light guide plate that guides light from the LEDs is known.
  • FIG. 9 is a cross-sectional view showing the structure of a conventional backlight device including an LED and a light guide plate.
  • the backlight device 1001 includes an LED (light source) 1002, a mounting substrate 1003 on which the LED 1002 is mounted, a fixing member 1004 to which the mounting substrate 1003 is fixed, a light guide plate 1005 that guides light from the LED 1002, and a light guide plate
  • the reflective sheet 1006 arrange
  • the light guide plate 1005 is formed in a flat plate shape, and has a light incident surface 1005a provided on one side surface and a light emitting surface 1005b which is the widest surface.
  • the fixing member 1004 is fixed to the backlight frame 1007.
  • light emitted from the LED 1002 enters the incident surface 1005 a of the light guide plate 1005, and exits from the output surface 1005 b of the light guide plate 1005 toward a display panel (not shown).
  • Patent Document 1 discloses a structure in which, in a backlight unit (illumination device) using a light guide plate, the light guide plate is fixed in the metal frame without rattling by a springy projecting member.
  • the light guide plate 1005 is made of resin, and expands due to heat generated when the backlight device 1001 is used.
  • the light guide plate 1005 may contact the LED 1002 and the LED 1002 may be damaged.
  • the gap needs to be reduced in order to reduce the light incident loss to the light guide plate 1005.
  • the clearance gap between the light-guide plate 1005 and the light source 1002 is set to about several mm, for example. This gap is about 3 mm in a 60-inch class display device.
  • the light guide plate 1005 when the light guide plate 1005 expands more than expected (over the gap) due to heat, the light guide plate 1005 contacts the LED 1002.
  • the LED 1002 is formed by molding a light-emitting chip with a transparent resin as a lens, and is easily damaged. For this reason, when the light guide plate 1005 contacts the LED 1002, there is a problem that the LED 1002 may be damaged.
  • Patent Document 1 it is possible to suppress the light guide plate from coming into contact with the LED to some extent by the projecting member having the spring property.
  • the protruding member since the protruding member has a spring property, when the light guide plate expands due to heat, the protruding member may be compressed and deformed to contact the LED. For this reason, similarly to the backlight device 1001, there is a problem that the LED may be damaged.
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to provide an illumination device and a display capable of suppressing the light source plate from coming into contact with the light source and damaging the light source. Is to provide a device.
  • an illuminating device of the present invention includes a light source having a light emission surface, and a light emitted from the light emission surface that is disposed at a predetermined interval from the light emission surface in the light emission direction.
  • a light guide plate having an incident surface, a mounting substrate having a mounting surface on which the light source is mounted and disposed opposite to the incident surface, and a contact between the light guide plate and the light source disposed between the mounting surface and the incident surface
  • a restricting member including a restricting portion for preventing
  • a restricting member including a restricting portion that is disposed between the mounting surface and the incident surface and prevents contact between the light guide plate and the light source is provided. Thereby, a contact with a light-guide plate and a light source can be blocked
  • the restricting portion is made of an inelastic material that is not compressed and deformed by the pressing force from the light guide plate, and the thickness of the restricting portion in the light emitting direction is larger than the distance from the mounting surface to the light emitting surface. . If comprised in this way, the distance between a light-guide plate and a control part will become smaller than the distance between a light-guide plate and a light source. For this reason, when a light guide plate expand
  • the restriction member is preferably made of metal. If comprised in this way, it can suppress easily that a control part is compressively deformed by the pressing force from a light-guide plate.
  • the lighting device may further include a fixing member to which the mounting board is fixed.
  • the restricting member includes a substrate fixing screw for fixing the mounting substrate to the fixing member, and the restricting portion includes a screw head of the substrate fixing screw.
  • the lighting device including the fixing member further includes a frame that houses the light guide plate and to which the fixing member is attached, and an attachment screw for attaching the fixing member to the frame.
  • An insertion hole extending in the light emitting direction is formed while inserting the screw for use.
  • a plurality of light sources are provided along a direction parallel to the incident surface of the light guide plate, and the restricting portion is disposed between the light sources.
  • 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.
  • a regulating member that is disposed between the mounting surface and the incident surface and includes a regulating portion that prevents contact between the light guide plate and the light source, Contact can be prevented.
  • swells more than expected by heat
  • the distance between the light source and the light guide plate need not be increased more than necessary. Thereby, it can suppress that the incident light loss to a light-guide plate increases, and can improve the utilization efficiency of light.
  • FIG. 3 is an enlarged cross-sectional view taken along the line 100-100 in FIG. It is the expansion perspective view which showed the structure of the illuminating device of 1st Embodiment of this invention.
  • FIG. 3 is an enlarged sectional view taken along line 150-150 in FIG. It is the expansion perspective view which showed the structure of the illuminating device of 2nd Embodiment of this invention. It is the expanded sectional view which showed the structure of the illuminating device of 2nd Embodiment of this invention. It is the top view which showed the structure of the modification of the illuminating device of this invention. It is sectional drawing which showed the structure of the backlight apparatus by a conventional example provided with LED and the light-guide plate.
  • the display device 1 is used for a television receiver, for example.
  • the display device 1 includes a display panel 2 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. As shown in FIGS. 1 and 2, the lighting device 10 includes a plurality of light sources 11, a mounting substrate 12 on which the plurality of light sources 11 are mounted, a fixing member 13 on which the mounting substrate 12 is fixed, and a light source 11.
  • a board fixing screw 17 (regulating member) for fixing the mounting board 12 to the fixing member 13 and a mounting screw 18 for attaching the fixing member 13 to the backlight frame 16.
  • the reflection sheet 15 is omitted.
  • the plurality of light sources 11 are arranged on the side of the light guide plate 14 and are arranged at predetermined intervals in the A direction (direction parallel to the incident surface 14a of the light guide plate 14).
  • the light emitting surface 11a of the light source 11 is disposed to face the incident surface 14a of the light guide plate 14, and is disposed at a predetermined distance (for example, several mm) from the light guide plate 14 in the B direction (light emitting direction of the light source 11).
  • the light source 11 is composed of an LED, for example, and emits white light.
  • the light source 11 is mounted on the mounting surface 12a of the mounting substrate 12 using a solder layer (not shown).
  • the mounting surface 12 a of the mounting substrate 12 is disposed opposite to the incident surface 14 a of the light guide plate 14.
  • the mounting substrate 12 is fixed to the fixing member 13 by a substrate fixing screw 17 made of metal (inelastic material).
  • a screw insertion hole 12 b is formed in the mounting substrate 12, and a screw hole 13 c described later is formed in the fixing member 13.
  • the mounting board 12 is fixed to the fixing member 13 by screwing the board fixing screws 17 into the screw holes 13 c of the fixing member 13 through the screw insertion holes 12 b of the mounting board 12.
  • the “inelastic body” means a material that does not have a spring property, and is a concept including a resin and a metal other than rubber and sponge.
  • “Screw” is a concept including “bolts” and “screws” used in combination with a nut, and the board fixing screw 17 may be configured to tighten the mounting board 12 and the fixing member 13 using a nut. Good.
  • the screw head 17 a (regulator) of the board fixing screw 17 is disposed between the mounting surface 12 a of the mounting substrate 12 and the incident surface 14 a of the light guide plate 14, and between the light sources 11. Arranged between.
  • the screw head 17 a has a function of preventing contact between the light guide plate 14 and the light source 11.
  • the screw head 17 a is formed so that the thickness in the B direction is larger than that of the light source 11. That is, as shown in FIG. 3, the distance L1 from the mounting surface 12a of the mounting substrate 12 to the top of the screw head 17a (the thickness in the B direction of the screw head 17a) L1 is the light emitting surface 11a of the light source 11 from the mounting surface 12a. It is larger than the distance L2.
  • the distance between the light guide plate 14 and the screw head 17a is smaller than the distance between the light guide plate 14 and the light source 11. For this reason, when the light guide plate 14 expands due to heat (when the incident surface 14a of the light guide plate 14 moves to the light source 11 side), the screw head 17a contacts the light guide plate 14 before the light source 11 contacts the light guide plate 14. Abut.
  • the difference between the thickness L1 of the screw head 17a in the B direction and the distance L2 from the mounting surface 12a to the light emitting surface 11a is preferably as small as possible.
  • the fixing member 13 has an L-shaped cross section, and includes a substrate fixing portion 13a to which the mounting substrate 12 is fixed and an attachment portion 13b parallel to the surface direction (A direction and B direction) of the light guide plate 14. Contains.
  • the board fixing portion 13a is provided with a screw hole 13c to which the board fixing screw 17 is screwed.
  • the fixing member 13 is attached to the back surface portion 16a of the backlight frame 16 by mounting screws 18. Specifically, as shown in FIGS. 4 and 5, a screw insertion hole 13d is formed in the mounting portion 13b of the fixing member 13, and a screw hole 16b (see FIG. 5) is formed in the back surface portion 16a of the backlight frame 16. ) Is formed.
  • the fixing member 13 is attached to the backlight frame 16 by screwing the mounting screw 18 into the screw hole 16 b of the backlight frame 16 through the screw insertion hole 13 d of the fixing member 13.
  • the mounting screw 18 may be configured to tighten the fixing member 13 and the backlight frame 16 using a nut.
  • the light guide plate 14 includes an incident surface 14 a on which light emitted from the light emitting surface 11 a of the light source 11 is incident, and an output surface 14 b that emits planar light toward the display panel 2. , And back surface 14c (see FIG. 1).
  • the light guide plate 14 has a function of guiding light incident on the incident surface 14a, and changing the traveling direction of the light to emit it to the display panel 2 side.
  • the light guide plate 14 is made of resin.
  • a plurality of optical sheets are arranged on the light exit surface 14 b side (display panel 2 side) of the light guide plate 14.
  • the plurality of optical sheets are constituted by a diffusion plate, a prism sheet, a lens sheet, and the like, and have a function of diffusing light from the light guide plate 14 or 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 15 has a function of reflecting the light emitted from the back surface 14 c of the light guide plate 14 and re-entering the light guide plate 14.
  • the backlight frame 16 may be formed by bending a metal plate, for example.
  • the backlight frame 16 may be formed in a frame shape.
  • the thickness L1 in the B direction of the screw head 17a is made larger than the distance L2 from the mounting surface 12a to the light emitting surface 11a.
  • the distance between the light guide plate 14 and the screw head 17a is smaller than the distance between the light guide plate 14 and the light source 11.
  • the screw head 17 a contacts the light guide plate 14 before the light source 11 contacts the light guide plate 14. Since the screw head 17a is made of metal, it is not compressed and deformed even if it receives a pressing force from the light guide plate 14.
  • the light guide plate 14 can be prevented from coming into contact with the light source 11, and the light source 11 can be prevented from being damaged.
  • the distance between the light source 11 and the light guide plate 14 need not be increased more than necessary. Therefore, it can suppress that the incident light loss to the light-guide plate 14 increases, and can improve the utilization efficiency of light.
  • one member (substrate fixing screw 17) has a function of preventing the light guide plate 14 from coming into contact with the light source 11, and a function of fixing the mounting substrate 12 to the fixing member 13. As a result, an increase in the number of parts can be suppressed.
  • the screw insertion hole 113d (insertion hole) of the fixing member 13 into which the mounting screw 18 is inserted has an elongated hole shape extending in the B direction. Is formed.
  • the fixing member 13 is attached to the backlight frame 16 by mounting screws 18 so as to move outward in the B direction by the pressing force from the light guide plate 14.
  • the fixing member 13 is attached to the backlight frame 16 by forming the screw insertion hole 113d of the fixing member 13 into a long hole shape extending in the B direction. It can be moved in the B direction.
  • the substrate fixing screw 17 the mounting substrate 12, and the fixing member 13 move in the B direction. That is, when the light guide plate 14 further expands after contacting the substrate fixing screw 17, the substrate fixing screw 17 moves outward. For this reason, since it can suppress that the light-guide plate 14 bends, it can suppress that a uniform planar light does not radiate
  • 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. If the compression member is not compressed and deformed by the pressing force from the light guide plate, the regulating member may be formed of, for example, resin instead of metal.
  • the mounting substrate is fixed to the fixing member using the substrate fixing screw
  • the present invention is not limited to this.
  • the mounting substrate may be fixed to the fixing member using a rivet.
  • the thickness of the head of the rivet may be increased and this head may be used as the restricting portion.
  • a regulating member 220 may be provided separately from the board fixing screw 217 as in the lighting device according to the modification of the present invention shown in FIG.
  • the thickness in the B direction of the screw head 217 a of the board fixing screw 217 may be made smaller than the thickness of the light source 11.
  • the regulating member 220 may be adhered to the mounting surface 12a of the mounting substrate 12 by an adhesive layer or the like (not shown). Further, the regulating member 220 may be bonded to the light guide plate 14.
  • the nut when the mounting board and the fixing member are tightened by using a nut for fixing the board, the nut may be used as a restricting part, and the screw shaft protruding from the nut may be used as the restricting part.
  • the mounting substrate is fixed to the fixing member.
  • the present invention is not limited to this, and the mounting substrate may be fixed to, for example, a backlight frame.
  • the mounting substrate and the fixing member may be configured to return to their original positions after moving in the B direction.
  • a coil spring may be disposed outside the fixing member, and the fixing member may be returned to the original position when the pressing force from the light guide plate disappears after the fixing member moves due to the pressing force of the light guide plate.
  • the light guide plate can be prevented from coming into contact with the light source even when the light guide plate is expanded by heat, and the light source can be prevented from being damaged. Needless to say, the same effect can be obtained when the light guide plate moves toward the light source.

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

Abstract

La présente invention concerne un dispositif d'éclairage permettant d'éviter que les sources de lumière ne soient endommagées lorsqu'elles entrent en contact avec une plaque de guidage de lumière. Ce dispositif d'éclairage (10) comprend : des sources de lumière (11) comportant une surface d'émission de lumière (11a) ; une plaque de guidage de lumière (14) présentant une surface d'entrée (14a) par laquelle la lumière entre ; un substrat de montage (12) doté d'une surface de montage (12a) où les sources de lumière sont montées ; ainsi que des vis de fixation de substrat (17) qui sont situées entre la surface de montage et la surface d'entrée, et qui possèdent des têtes de vis (17a) empêchant tout contact entre la plaque de guidage de lumière et la source de lumière.
PCT/JP2012/061856 2011-05-16 2012-05-09 Dispositif d'éclairage et dispositif d'affichage WO2012157485A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-109758 2011-05-16
JP2011109758 2011-05-16

Publications (1)

Publication Number Publication Date
WO2012157485A1 true WO2012157485A1 (fr) 2012-11-22

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PCT/JP2012/061856 WO2012157485A1 (fr) 2011-05-16 2012-05-09 Dispositif d'éclairage et dispositif d'affichage

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015011988A (ja) * 2013-06-28 2015-01-19 エルジー イノテック カンパニー リミテッド 照明ユニット

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009154362A2 (fr) * 2008-06-17 2009-12-23 Samsung Electronics Co., Ltd. Unité de rétroéclairage pour dispositif d'affichage à cristaux liquides
JP2010135297A (ja) * 2008-11-04 2010-06-17 Fujifilm Corp 面状照明装置
WO2010082377A1 (fr) * 2009-01-13 2010-07-22 シャープ株式会社 Dispositif d'éclairage, dispositif d'affichage et récepteur de télévision
JP2010177017A (ja) * 2009-01-29 2010-08-12 Kyocera Corp 光源装置および該光源装置を備える液晶表示装置
JP2011086627A (ja) * 2009-10-19 2011-04-28 Samsung Electronics Co Ltd バックライトアセンブリ及びこれを含む液晶表示装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009154362A2 (fr) * 2008-06-17 2009-12-23 Samsung Electronics Co., Ltd. Unité de rétroéclairage pour dispositif d'affichage à cristaux liquides
JP2010135297A (ja) * 2008-11-04 2010-06-17 Fujifilm Corp 面状照明装置
WO2010082377A1 (fr) * 2009-01-13 2010-07-22 シャープ株式会社 Dispositif d'éclairage, dispositif d'affichage et récepteur de télévision
JP2010177017A (ja) * 2009-01-29 2010-08-12 Kyocera Corp 光源装置および該光源装置を備える液晶表示装置
JP2011086627A (ja) * 2009-10-19 2011-04-28 Samsung Electronics Co Ltd バックライトアセンブリ及びこれを含む液晶表示装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015011988A (ja) * 2013-06-28 2015-01-19 エルジー イノテック カンパニー リミテッド 照明ユニット

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