WO2012070331A1 - Edge light illuminating device and display device - Google Patents

Edge light illuminating device and display device Download PDF

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Publication number
WO2012070331A1
WO2012070331A1 PCT/JP2011/073824 JP2011073824W WO2012070331A1 WO 2012070331 A1 WO2012070331 A1 WO 2012070331A1 JP 2011073824 W JP2011073824 W JP 2011073824W WO 2012070331 A1 WO2012070331 A1 WO 2012070331A1
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WO
WIPO (PCT)
Prior art keywords
light
guide plate
chassis
light source
edge
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PCT/JP2011/073824
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French (fr)
Japanese (ja)
Inventor
裕紀 行方
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シャープ株式会社
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Publication of WO2012070331A1 publication Critical patent/WO2012070331A1/en

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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
    • G02B6/0081—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
    • G02B6/0085—Means for removing heat created by the light source from the package
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133628—Illuminating devices with cooling means

Definitions

  • the present invention relates to an edge light illumination device and a display device, and more particularly to an edge light illumination device suitable as a surface light source for a liquid crystal display device or the like.
  • an edge light type (sometimes referred to as a sidelight type) lighting device is widely used as a backlight for irradiating a display panel with external light in a display device such as a liquid crystal display device (for example, Patent Document 1). reference).
  • the edge light type illumination device described in Patent Document 1 includes a light source substrate 103 in which a light source 102 such as an LED (light emitting diode) is mounted on a box-shaped rear frame 101 having an opening, and a light guide plate. 104 is arranged.
  • the light source 103 is disposed at a position facing one side surface (edge) of the light guide plate 104.
  • a reflection sheet 105 is disposed on the bottom surface side of the rear frame 101, and an optical sheet 106 is disposed on the opening side of the rear frame 101.
  • a display panel 107 such as a liquid crystal display panel is mounted on the edge light type illumination device, and the display device 109 is configured by fitting the front frame 108 to the rear frame 101.
  • Edge light type lighting devices are required to further improve brightness.
  • the edge light device has a problem that the structure of the light source substrate 103 and the frame is complicated. Further, the edge light device has a problem in that it is necessary to align the positions of the thread grooves of the rear frame 101 and the front frame 108 serving as a casing, and it is necessary to form each member with high accuracy and to assemble precisely.
  • the problem to be solved by the present invention is that, in an edge light type illumination device, it is possible to efficiently cool the light source and further improve the luminance, and the structure is simple and requires high accuracy.
  • An object of the present invention is to provide an edge light type illumination device and a display device which are not.
  • the edge light type illumination device of the present invention A box-shaped chassis having an opening with an opening on the front surface, a flat light guide plate disposed in the chassis, and light incident on the light guide plate from a side surface that is a light incident surface of the light guide plate
  • a light source for causing The light source includes a reflecting member that is disposed outside the light guide plate on the inner bottom surface of the chassis and reflects light emitted from the light source toward the light incident surface of the light guide plate.
  • the reflecting member is a plane mirror or a concave mirror, so that light emitted from the light source can be effectively incident on the light guide plate.
  • the light source has a plurality of LEDs arranged on an LED substrate that is long in the longitudinal direction of the side surface of the light guide plate.
  • the chassis is made of metal
  • the light source is mounted on the bottom surface of the chassis via a heat sink
  • the heat sink is made of aluminum.
  • the gist of the display device of the present invention is that the above-described edge light type illumination device is used as an external light irradiation device for a display panel.
  • the display panel is preferably a liquid crystal display panel.
  • the light source is disposed on the chassis bottom portion in the side surface direction of the light guide plate with the light emission surface facing the front side, and the light emitted from the light source to the front side is
  • the heat of the light source can be dissipated from the bottom surface of the chassis. Since the bottom surface of the chassis has a larger area than the side surface of the chassis, the heat dissipation efficiency is improved. Since the edge light type illumination device of the present invention can efficiently dissipate heat from the light source, the luminance can be further improved.
  • the edge light type illumination device of the present invention since the light source is disposed on the bottom surface of the chassis, the edge light type illumination device of the present invention does not have a complicated structure as in the case where the light source is attached to the side surface of the chassis. Does not require assembly accuracy. Therefore, the assembly of the device is easy and the device can be provided at a low cost.
  • the display device according to the present invention uses the above-described edge light type illumination device as an external light irradiation device, it is possible to improve luminance and obtain a display image with excellent display quality.
  • FIG. 1 is a sectional view schematically showing an embodiment of the edge light type illumination device of the present invention
  • FIG. 2 is an exploded perspective view of the edge light type illumination device of FIG.
  • the edge light type illumination device 10 includes a light guide plate 11, a light source 12 disposed in a side surface direction (edge side) of the light guide plate 11, a reflection sheet 14, and a reflection member 18.
  • the optical sheet 20 and the like are housed in an exterior material constituted by the frame 5 and the chassis 40.
  • the chassis 40 includes a bottom surface portion 42 having a horizontally long rectangular shape when viewed from above and a side surface portion 41 around the bottom surface portion 42, and is formed in a box shape having an opening having an open front surface.
  • the frame 5 has an opening.
  • the chassis 40 is formed by forming a metal plate material such as aluminum or iron into a shallow box shape by bending or the like.
  • the opening side of the chassis 40 is referred to as the front surface side, and the surface facing the opening side of the chassis 40 is referred to as the bottom surface.
  • the opening side of the chassis 40 is a surface from which light is emitted in the edge light type illumination device. That is, the edge light type illumination device of the present invention is a surface light source having a front surface formed as a light emitting surface.
  • the light guide plate 11 has a light incident surface 11a on one side where the light source 12 is disposed, a light emitting surface 11b on the front side, and a light reflecting surface 11c on the bottom side.
  • the light source 12 uses an LED (light emitting diode) as a light emitting element. As shown in FIG. 2, the light source 12 is configured by arranging a plurality of LEDs 16, 16... In a line on the surface of the LED substrate 17. The LED substrate 17 is disposed on the bottom surface portion 42 of the chassis 40. The light source 12 is disposed so that the LED 16 has a light emission surface directed toward the front surface side, and is attached so as to emit light toward the front surface side.
  • LED light emitting diode
  • the LED 16 has a package structure in which, for example, an LED chip that generates blue light is sealed with a transparent resin mixed with a yellow phosphor, and is formed to emit white light from the light emitting surface.
  • the LED substrate 17 is fixed to the bottom surface portion 42 of the chassis via a heat radiating plate 19 made of an aluminum plate.
  • a heat radiating plate 19 made of an aluminum plate.
  • an iron plate or the like can be used as the metal plate constituting the chassis 40.
  • the LED substrate 17 is screwed to the heat radiating plate 19 with screws or the like, and the heat radiating plate 19 is screwed to the chassis bottom surface portion 42 with screws or the like.
  • the mounting structure can be made simpler than when the LED 16 is disposed on the chassis side surface portion 41. Furthermore, since the chassis bottom surface portion 42 has a larger area than the chassis side surface portion 41, it is possible to secure a large heat radiation area when radiating the heat generated from the LED 16, and thus it is possible to improve the heat dissipation. . Therefore, it is possible to increase the element density by increasing the number of LEDs 16 in the light source or increase the current value, and further improve the luminance.
  • the LED substrate 17 is fixed to the bottom surface 42 of the metal chassis 40 through the aluminum heat sink 19 in the edge light type illumination device of the embodiment of FIG. 1, the heat generated from the LED 16 is thermally conductive. Excellent heat dissipation can be obtained by quickly transferring heat in the order of the good aluminum heat sink 19 and the metal chassis bottom 42.
  • the reflecting member 18 is for reflecting the light emitted from the LED 16 on the chassis bottom surface portion 42 to the front side so that the light enters the light guide plate 11 from the light incident surface 11 a of the light guide plate 11.
  • the reflection member 18 is disposed on the front side in the light emission direction of the LED 16.
  • the reflecting member 18 is fixed to the chassis 40 by appropriate locking means such as screwing.
  • the reflecting member 18 may be a concave mirror other than the plane mirror shown in FIG.
  • FIG. 3 is a cross-sectional view schematically showing another example of the edge light type illumination device of the present invention.
  • a concave mirror that is concave on the light source 12 side and the light reflecting surface 11 c side can be used as the reflecting member 18 of the edge light type illumination device 10.
  • the reflecting member 18 By using the reflecting member 18 as a concave mirror, the shape of the concave surface can be appropriately formed, and the light from the light source 12 can be condensed at a specific position on the light incident surface 11a of the light guide plate.
  • a mirror in which a metal reflecting film formed by vacuum deposition of silver, aluminum, lead or the like is formed on a transparent base material such as a glass plate or a plastic sheet is used. it can.
  • the reflection member 18 may be a reflection member that diffusely reflects in addition to the reflection member that reflects the surface like a mirror.
  • the reflective member that diffusely reflects include a white reflective layer formed of a paint, ink, or the like in which a white pigment such as titanium oxide or barium sulfate is added to a binder resin such as an acrylic resin in a binder resin.
  • the white reflective layer is formed on the surface of a glass plate, a plastic plate or the like.
  • the light guide plate 11 is composed of a rectangular transparent thin plate.
  • the light guide plate 11 is formed from a transparent plastic such as acrylic resin, polycarbonate resin, or cycloolefin resin.
  • the thickness of the light guide plate 11 is usually about 3 to 4 mm.
  • the light guide plate 11 has a reflection pattern 13 formed on a light reflection surface 11c. Further, a reflection sheet 14 separate from the light guide plate 11 is disposed on the light guide plate 11 on the reflective pattern 13 side.
  • the reflection pattern 13 is formed directly on the surface of the light reflection surface 11c of the light guide plate 11 by printing such as screen printing.
  • the reflection pattern 13 is configured by a white dot pattern composed of a plurality of white dots formed by paint, ink, or the like in which a white pigment such as titanium oxide or barium sulfate is added to a binder resin such as an acrylic resin.
  • the specific pattern such as the size and position of the dots of the reflective pattern 13 is such that the light emitted from the light source 12 is scattered and reflected so that the light emitted from the light emitting surface 11b can be emitted uniformly over the entire surface. It only has to be formed.
  • the reflection pattern 13 can be formed so that, for example, the dot diameter is small near the light source and the dot diameter is large near the light source.
  • various known patterns can be used as appropriate according to the type and arrangement of the light source.
  • the reflective pattern 13 can be formed by using a molding method such as injection molding in addition to the printing method.
  • the light reflected from the light source 11 incident on the light guide plate 11 is diffused by the reflection pattern 13 and passes through the opposite light reflection surface 11c without going to the light emission surface 11b. This is for reflecting the light emitting surface 11b.
  • the reflection sheet 14 for example, a plastic sheet having a thickness of about 0.1 to 2 mm is used.
  • the reflection sheet 14 may be either specular reflection or irregular reflection.
  • the specular reflection sheet 14 include a polyester film on which a metal such as aluminum or silver is deposited.
  • a sheet or the like whose surface on the light guide plate side is painted white is used. Examples of such a sheet include a white polyester film, an ultra-white polyester film, an interface multiple reflection type reflection sheet, a porous PP, a finely foamed polyester sheet, and the like.
  • an optical sheet 20 is disposed on the surface of the light guide plate 11 opposite to the reflection pattern 13.
  • the optical sheet 20 is configured, for example, by sequentially arranging a plurality of sheets such as a diffusion sheet, a lens sheet, and a polarization selective reflection sheet from the light emitting surface 11b side of the light guide plate.
  • the above diffusion sheet makes the luminance in the surface direction of the emitted light more uniform.
  • the lens sheet collects the light transmitted through the diffusion sheet and increases the luminance.
  • the polarization selective reflection sheet transmits polarized light in a specific direction and reflects other polarized light so that the light reaching the liquid crystal display panel is not absorbed by the polarizing plate of the liquid crystal panel.
  • the optical sheet 20, the light guide plate 11, and the reflection sheet 14 are fixed to the chassis 40 by the frame 5 in a state of being laminated in this order.
  • the frame 5 is formed in a frame shape (frame shape) extending along the outer peripheral end portion of the light guide plate 11, and the outer peripheral end portions of the optical sheet 20 and the light guide plate 11 can be pressed from the front side over substantially the entire periphery. It is possible.
  • the frame 5 is made of, for example, black synthetic resin and has a light shielding property. Further, the frame 5 can receive the back surface of the outer peripheral end portion of the liquid crystal display panel 3 with its frame-shaped front surface (see FIG. 4).
  • FIG. 4 is an exploded perspective view showing an example of a display device using the edge light type illumination device as a backlight.
  • the display device illustrated in FIG. 4 is an example of a liquid crystal display device using a liquid crystal panel as a display panel.
  • the liquid crystal display device 1 includes a liquid crystal display panel 3 and an edge light type illumination device 10 that is a backlight device for irradiating the liquid crystal display panel 3 with light, and these are frame-shaped.
  • the bezel 2 is integrally held.
  • the liquid crystal display panel 3 is disposed on the light emitting surface 11 b side on the front side of the edge light type illumination device 10.
  • the bezel 2 has a frame shape that covers the periphery of the liquid crystal display panel 3, and ensures the strength of the entire liquid crystal display device 1 together with the chassis 40 included in the edge light type illumination device 10.
  • the liquid crystal display panel 3 has a horizontally long rectangular shape when viewed from above.
  • the liquid crystal display panel 3 includes a pair of glass substrates, each composed of a thin film transistor (TFT) array substrate 3a and a color filter (CF) substrate 3b, which are bonded in parallel with a predetermined distance therebetween. It has a liquid crystal layer (not shown) in which liquid crystal is sealed.
  • TFT thin film transistor
  • CF color filter
  • a plurality of TFTs and pixel electrodes are formed in a matrix on the TFT array substrate 3a, and a plurality of colored patterns are formed in a matrix on the CF substrate 3b, and a common electrode is formed on almost the entire surface.
  • An image can be displayed by controlling the orientation of the liquid crystal by changing the voltage applied between the pixel electrode and the common electrode.
  • a polarizing plate is provided on each of the front and back surfaces of the liquid crystal display panel 3 (not shown).
  • the frame 5 and the bezel 2 are screwed to the chassis side part 41.
  • a power supply substrate 51 that supplies power to the LED substrate 17, a control substrate 52 that drives the liquid crystal display panel 3, and the like are disposed.
  • the light emitted from the LED of the light source 12 to the front side is reflected by the reflecting member 11 in the side surface direction of the light guide plate 11.
  • the light reflected by the reflecting member 18 enters the light guide plate 11 from the light incident surface 11a of the light guide plate.
  • Light incident on the inside of the light guide plate 11 travels through the light guide plate 11 and is scattered by the reflection pattern 13.
  • the scattered light is repeatedly reflected between the light emitting surface 11b and the light reflecting surface 11c by the reflection sheet 14, spreads in a planar shape inside, and is emitted in a planar shape from the light emitting surface 11b of the light guide plate 11.
  • the planar light emitted from the light emitting surface 11b passes through the diffusion sheet, the lens sheet, the polarization selective reflection sheet, etc. of the optical sheet 20, and has optical characteristics such as luminance and uniformity. Is improved, and the back side of the liquid crystal display panel 3 is irradiated.
  • the display device of the present invention includes the edge light type illumination device as an external light irradiation device that irradiates the display panel with external light.
  • the display device of the present invention can be suitably used for a large television or the like as a liquid crystal display device.
  • the display device of the present invention is not limited to a liquid crystal display device, and can be used for various display devices as long as the display device is a combination of a display panel and an external light irradiation device.

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

Abstract

Provided are a display device and an edge light illuminating device that is capable of efficiently cooling a light source and further improving brightness, has a simple structure, and does not require a high degree of precision. The edge light illuminating device (10) is configured in such a manner that: a light guide plate (11) and a light source (12) disposed in the direction of the side of the light guide plate (11) comprise a bottom part (42) and a side part (41), and are housed in a box-shaped chassis (40) having an opening in the front; the light source (12) is disposed on the bottom (42) of the chassis in the direction of the side of the light guide plate (11) with the light emitting surface facing the front; and a reflecting member (18) for reflecting light emitted to the front side from the light source (12) to the side of the light guide plate is provided.

Description

エッジライト型照明装置及び表示装置Edge light type illumination device and display device
　本発明は、エッジライト型照明装置及び表示装置に関し、特に液晶表示装置等の面光源として好適なエッジライト型照明装置に関する。 The present invention relates to an edge light illumination device and a display device, and more particularly to an edge light illumination device suitable as a surface light source for a liquid crystal display device or the like.
　エッジライト型（サイドライト方式ということもある）照明装置は、液晶表示装置等の表示装置において、表示パネルに外部光を照射するためのバックライト等として広く用いられている（例えば、特許文献１参照）。図５に示すように、特許文献１に記載のエッジライト型照明装置は、開口部を有する箱型のリアフレーム１０１にＬＥＤ（発光ダイオード）等の光源１０２を実装した光源基板１０３と、導光板１０４が配置されている。 An edge light type (sometimes referred to as a sidelight type) lighting device is widely used as a backlight for irradiating a display panel with external light in a display device such as a liquid crystal display device (for example, Patent Document 1). reference). As shown in FIG. 5, the edge light type illumination device described in Patent Document 1 includes a light source substrate 103 in which a light source 102 such as an LED (light emitting diode) is mounted on a box-shaped rear frame 101 having an opening, and a light guide plate. 104 is arranged.
　光源１０３は、導光板１０４の一側面（エッジ）と対向する位置に配置されている。リアフレーム１０１の底面側には反射シート１０５が配置され、リアフレーム１０１の開口部側には光学シート１０６が配置されている。更にエッジライト型照明装置の上には液晶表示パネル等の表示パネル１０７が装着され、リアフレーム１０１にフロントフレーム１０８を嵌合させることで表示装置１０９を構成している。 The light source 103 is disposed at a position facing one side surface (edge) of the light guide plate 104. A reflection sheet 105 is disposed on the bottom surface side of the rear frame 101, and an optical sheet 106 is disposed on the opening side of the rear frame 101. Further, a display panel 107 such as a liquid crystal display panel is mounted on the edge light type illumination device, and the display device 109 is configured by fitting the front frame 108 to the rear frame 101.
特開２００９－３０８１号公報JP 2009-3081 A
　エッジライト型照明装置は、輝度を高めようとした場合、光源のＬＥＤの密度を増加させたり、ＬＥＤに供給する電流を増加させることが考えられる。しかし、上記の手段で光源の輝度を高めると、ＬＥＤから生ずる熱により、ＬＥＤの発光効率が低下し、またＬＥＤの寿命も短くなってしまうという問題があった。そのため、上記特許文献１の照明装置では、光源を取り付けているリアフレーム１０１とフロントフレーム１０８の側壁部、及び光源基板１０３にネジ溝等を設け、ネジ溝に止めネジ１１０をネジ止めして光源１０２を所定の位置に固定していた。上記構成によれば、光源基板１０３、リアフレーム１０１、及びフロントフレーム１０８が止めネジにより強固に固定されるので、光源１０２の熱を効率よく放熱させることができるとされている。 When the brightness of the edge light type illumination device is to be increased, it is conceivable to increase the density of the LEDs of the light source or increase the current supplied to the LEDs. However, when the brightness of the light source is increased by the above-described means, there is a problem that the light emission efficiency of the LED is lowered and the life of the LED is shortened due to heat generated from the LED. Therefore, in the illuminating device of the above-mentioned Patent Document 1, a screw groove or the like is provided in the rear frame 101 and the side wall portion of the front frame 108 to which the light source is attached, and the light source substrate 103, and a set screw 110 is screwed into the screw groove. 102 was fixed in place. According to the above configuration, since the light source substrate 103, the rear frame 101, and the front frame 108 are firmly fixed by the set screws, the heat of the light source 102 can be efficiently radiated.
　エッジライト型照明装置は、更なる輝度の向上が要望されている。しかしながら、上記特許文献１に記載のエッジライト型照明装置の構造では、放熱に限界があり、更に輝度を向上させることは困難である。 Edge light type lighting devices are required to further improve brightness. However, in the structure of the edge light type illumination device described in Patent Document 1, there is a limit to heat dissipation, and it is difficult to further improve the luminance.
　また上記エッジライト装置では、光源基板１０３やフレーム等の構造が複雑になるという問題があった。更に上記エッジライト装置は、筐体となるリアフレーム１０１とフロントフレーム１０８のネジ溝の位置を合わせる必要があり、各部材を高精度に形成し、精密に組み立てる必要があるという問題があった。 Further, the edge light device has a problem that the structure of the light source substrate 103 and the frame is complicated. Further, the edge light device has a problem in that it is necessary to align the positions of the thread grooves of the rear frame 101 and the front frame 108 serving as a casing, and it is necessary to form each member with high accuracy and to assemble precisely.
　上記実状に鑑み、本発明が解決しようとする課題は、エッジライト型照明装置において、光源を効率良く冷却し輝度を更に向上させることが可能であると共に、構造が簡単であり高度な精度を必要としないエッジライト型照明装置及び表示装置を提供することにある。 In view of the above situation, the problem to be solved by the present invention is that, in an edge light type illumination device, it is possible to efficiently cool the light source and further improve the luminance, and the structure is simple and requires high accuracy. An object of the present invention is to provide an edge light type illumination device and a display device which are not.
　このような課題を解決するために、本発明のエッジライト型照明装置は、
　前面が開口した開口部を有する箱形形状をしたシャーシと、該シャーシ内に配設される平板状の導光板と、該導光板の光入射面である側面より該導光板内に光を入射させるための光源と、を有し、
　前記光源は、前記シャーシの内底面の前記導光板の外側に位置して配設され、該光源から出射された光を前記導光板の光入射面に向けて反射させるための反射部材を備えることを要旨とするものである。 In order to solve such a problem, the edge light type illumination device of the present invention,
A box-shaped chassis having an opening with an opening on the front surface, a flat light guide plate disposed in the chassis, and light incident on the light guide plate from a side surface that is a light incident surface of the light guide plate A light source for causing
The light source includes a reflecting member that is disposed outside the light guide plate on the inner bottom surface of the chassis and reflects light emitted from the light source toward the light incident surface of the light guide plate. Is a summary.
　上記エッジライト型照明装置において、前記反射部材は、平面鏡、或いは凹面鏡とすることにより、光源より出射された光を導光板に向けて有効に入射させることができる。 In the edge light type illumination device, the reflecting member is a plane mirror or a concave mirror, so that light emitted from the light source can be effectively incident on the light guide plate.
　また上記エッジライト型照明装置において、前記光源は、複数のＬＥＤが前記導光板の側面長手方向に長尺のＬＥＤ基板上に列設されていることが好ましい。 In the edge light type illumination device, it is preferable that the light source has a plurality of LEDs arranged on an LED substrate that is long in the longitudinal direction of the side surface of the light guide plate.
　また上記エッジライト型照明装置において、前記シャーシが金属製であり、前記光源は放熱板を介して前記シャーシ底面部に装着されていることや、前記放熱板がアルミニウム製であることが好ましい。 In the edge light type lighting device, it is preferable that the chassis is made of metal, the light source is mounted on the bottom surface of the chassis via a heat sink, and the heat sink is made of aluminum.
　本発明の表示装置は、上記のエッジライト型照明装置を、表示パネルの外光照射装置として用いたことを要旨とするものである。 The gist of the display device of the present invention is that the above-described edge light type illumination device is used as an external light irradiation device for a display panel.
　上記表示装置において、前記表示パネルが液晶表示パネルであることが好ましい。 In the display device, the display panel is preferably a liquid crystal display panel.
　本発明のエッジライト型照明装置は、光源が光放射面を前面側に向けた状態で前記導光板の側面方向のシャーシ底面部に配設され、前記光源から前面側に放射された光を前記導光板側面に反射させるための反射部材を備える構成を採用したことにより、光源の熱をシャーシ底面部から放熱させることができる。シャーシ底面部はシャーシ側面部と比較して、面積が大きいので放熱の効率が良くなる。本発明のエッジライト型照明装置は、光源からの熱を効率良く放熱することができるので、更なる輝度の向上が可能である。 In the edge light type illumination device of the present invention, the light source is disposed on the chassis bottom portion in the side surface direction of the light guide plate with the light emission surface facing the front side, and the light emitted from the light source to the front side is By adopting a configuration including a reflecting member for reflecting on the side surface of the light guide plate, the heat of the light source can be dissipated from the bottom surface of the chassis. Since the bottom surface of the chassis has a larger area than the side surface of the chassis, the heat dissipation efficiency is improved. Since the edge light type illumination device of the present invention can efficiently dissipate heat from the light source, the luminance can be further improved.
　更に本発明エッジライト型照明装置は、シャーシ底面部に光源が配設されていることから、シャーシ側面部に光源を取り付ける場合のように構造が複雑にならず、単純な構造でよく、部品や組立の精度を必要としない。そのため、装置の組立が容易で装置を安価に提供することができる。 In addition, since the light source is disposed on the bottom surface of the chassis, the edge light type illumination device of the present invention does not have a complicated structure as in the case where the light source is attached to the side surface of the chassis. Does not require assembly accuracy. Therefore, the assembly of the device is easy and the device can be provided at a low cost.
　本発明の表示装置は、上記のエッジライト型照明装置を外光照射装置として用いたものであるから、輝度を向上させることができ、表示品位の優れた表示画像を得ることができる。 Since the display device according to the present invention uses the above-described edge light type illumination device as an external light irradiation device, it is possible to improve luminance and obtain a display image with excellent display quality.
本発明の一実施形態に係るエッジライト型照明装置を模式的に示す断面図である。It is sectional drawing which shows typically the edge light type illuminating device which concerns on one Embodiment of this invention. 図１のエッジライト型照明装置の分解斜視図である。It is a disassembled perspective view of the edge light type illuminating device of FIG. 本発明のエッジライト型照明装置の他の実施形態を模式的に示す断面図である。It is sectional drawing which shows typically other embodiment of the edge light type illuminating device of this invention. 本発明のエッジライト型照明装置をバックライトとして用いた表示装置の一例である液晶表示装置を示す分解斜視図である。It is a disassembled perspective view which shows the liquid crystal display device which is an example of the display apparatus which used the edge light type illuminating device of this invention as a backlight. 従来のエッジライト型照明装置の断面図である。It is sectional drawing of the conventional edge light type illuminating device.
　以下、本発明の一実施形態について図面を参照して詳細に説明する。図１は本発明のエッジライト型照明装置の一実施形態を模式的に示す断面図であり、図２は図１のエッジライト型照明装置の分解斜視図である。図１及び図２に示すように、エッジライト型照明装置１０は、導光板１１と、該導光板１１の側面方向（エッジ側）に配置された光源１２と、反射シート１４と、反射部材１８と、光学シート２０等が、フレーム５とシャーシ４０により構成される外装材の内部に収納されている。 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view schematically showing an embodiment of the edge light type illumination device of the present invention, and FIG. 2 is an exploded perspective view of the edge light type illumination device of FIG. As shown in FIGS. 1 and 2, the edge light type illumination device 10 includes a light guide plate 11, a light source 12 disposed in a side surface direction (edge side) of the light guide plate 11, a reflection sheet 14, and a reflection member 18. The optical sheet 20 and the like are housed in an exterior material constituted by the frame 5 and the chassis 40.
　シャーシ４０は、平面に視て横長の長方形状を有する底面部４２と該底面部４２の周囲の側面部４１からなり、前面が開口した開口部を有する箱形形状に形成されている。フレーム５は、開口部を有する。シャーシ４０は、アルミニウム、鉄等の金属製板材を折り曲げ加工等によって、浅底の箱形状に成形したものである。 The chassis 40 includes a bottom surface portion 42 having a horizontally long rectangular shape when viewed from above and a side surface portion 41 around the bottom surface portion 42, and is formed in a box shape having an opening having an open front surface. The frame 5 has an opening. The chassis 40 is formed by forming a metal plate material such as aluminum or iron into a shallow box shape by bending or the like.
　尚、本発明では、シャーシ４０の開口部側を前面側といい、シャーシ４０の開口部側と対向する面を底面という。シャーシ４０の開口部側は、エッジライト型照明装置において光が放射される面である。すなわち本発明のエッジライト型照明装置は、前面が発光面として形成されている面光源である。 In the present invention, the opening side of the chassis 40 is referred to as the front surface side, and the surface facing the opening side of the chassis 40 is referred to as the bottom surface. The opening side of the chassis 40 is a surface from which light is emitted in the edge light type illumination device. That is, the edge light type illumination device of the present invention is a surface light source having a front surface formed as a light emitting surface.
　導光板１１は、光源１２が配設されている側の一側面が光入射面１１aであり、前面側が光放射面１１ｂであり、底面側が光反射面１１ｃとなっている。 The light guide plate 11 has a light incident surface 11a on one side where the light source 12 is disposed, a light emitting surface 11b on the front side, and a light reflecting surface 11c on the bottom side.
　光源１２は、発光素子としてＬＥＤ（発光ダイオード）を用いたものである。図２に示すように、光源１２は、ＬＥＤ基板１７の表面に複数のＬＥＤ１６、１６・・・が一列に配列されて構成されている。ＬＥＤ基板１７は、シャーシ４０の底面部４２に配設されている。光源１２は、ＬＥＤ１６が光放射面を前面側に向けた状態に配置されていて、前面側に光を放射するように取り付けられている。 The light source 12 uses an LED (light emitting diode) as a light emitting element. As shown in FIG. 2, the light source 12 is configured by arranging a plurality of LEDs 16, 16... In a line on the surface of the LED substrate 17. The LED substrate 17 is disposed on the bottom surface portion 42 of the chassis 40. The light source 12 is disposed so that the LED 16 has a light emission surface directed toward the front surface side, and is attached so as to emit light toward the front surface side.
　ＬＥＤ１６は、例えば青色光を発生させるＬＥＤチップを、黄色蛍光体が混合された透明樹脂で密封したパッケージ構造を有しており、発光面から白色光を放射するように形成されている。  The LED 16 has a package structure in which, for example, an LED chip that generates blue light is sealed with a transparent resin mixed with a yellow phosphor, and is formed to emit white light from the light emitting surface.
　ＬＥＤ基板１７は、アルミニウム板からなる放熱板１９を介してシャーシの底面部４２に固定されている。シャーシ４０を構成する金属板としては、鉄板等を用いることができる。ＬＥＤ基板１７は、放熱板１９にネジ等でネジ止めされ、放熱板１９はシャーシ底面部４２にネジ等でネジ止めされている。 The LED substrate 17 is fixed to the bottom surface portion 42 of the chassis via a heat radiating plate 19 made of an aluminum plate. As the metal plate constituting the chassis 40, an iron plate or the like can be used. The LED substrate 17 is screwed to the heat radiating plate 19 with screws or the like, and the heat radiating plate 19 is screwed to the chassis bottom surface portion 42 with screws or the like.
　このように、ＬＥＤ１６をシャーシ底面部４２に配置した場合、ＬＥＤ１６をシャーシ側面部４１に配置した場合と比較して、取り付け構造を単純な構造とすることができる。更にシャーシ底面部４２はシャーシ側面部４１と比較して面積が大きいので、ＬＥＤ１６から発生する熱を放熱する際の放熱面積を大きく確保することができるので、放熱性を向上せしめることが可能である。そのため、光源においてＬＥＤ１６の数を増やして素子密度を上げたり、電流値を上げたりすることが可能であり、更なる輝度向上を図ることができる。 Thus, when the LED 16 is disposed on the chassis bottom surface portion 42, the mounting structure can be made simpler than when the LED 16 is disposed on the chassis side surface portion 41. Furthermore, since the chassis bottom surface portion 42 has a larger area than the chassis side surface portion 41, it is possible to secure a large heat radiation area when radiating the heat generated from the LED 16, and thus it is possible to improve the heat dissipation. . Therefore, it is possible to increase the element density by increasing the number of LEDs 16 in the light source or increase the current value, and further improve the luminance.
　また図１の態様のエッジライト型照明装置は、ＬＥＤ基板１７がアルミニウム製の放熱板１９を介して金属製のシャーシ４０の底面４２に固定されているので、ＬＥＤ１６から発する熱を、熱伝導性の良いアルミニウム製の放熱板１９、金属製のシャーシ底面４２の順に素早く伝熱させて、優れた放熱性が得られる。 Further, since the LED substrate 17 is fixed to the bottom surface 42 of the metal chassis 40 through the aluminum heat sink 19 in the edge light type illumination device of the embodiment of FIG. 1, the heat generated from the LED 16 is thermally conductive. Excellent heat dissipation can be obtained by quickly transferring heat in the order of the good aluminum heat sink 19 and the metal chassis bottom 42.
　反射部材１８は、シャーシ底面部４２のＬＥＤ１６から前面側に放射された光を反射して、導光板１１の光入射面１１ａから導光板１１の内部に光を入射させるためのものである。反射部材１８は、ＬＥＤ１６の光放射方向となる前面側に配置されている。反射部材１８は、シャーシ４０にネジ止め等の適宜の係止手段により固定されている。 The reflecting member 18 is for reflecting the light emitted from the LED 16 on the chassis bottom surface portion 42 to the front side so that the light enters the light guide plate 11 from the light incident surface 11 a of the light guide plate 11. The reflection member 18 is disposed on the front side in the light emission direction of the LED 16. The reflecting member 18 is fixed to the chassis 40 by appropriate locking means such as screwing.
　反射部材１８は、図１に示す態様の平面鏡以外に凹面鏡でもよい。図３は本発明のエッジライト型照明装置の他の例を模式的に示す断面図である。例えば図３に示すように、エッジライト型照明装置１０の反射部材１８として、光源１２側と光反射面１１ｃ側に凹となっている凹面鏡を用いることもできる。反射部材１８を凹面鏡とすることで、その凹面の形状を適宜形成し、導光板の光入射面１１ａの特定の位置に光源１２からの光を集光させることができる。 The reflecting member 18 may be a concave mirror other than the plane mirror shown in FIG. FIG. 3 is a cross-sectional view schematically showing another example of the edge light type illumination device of the present invention. For example, as shown in FIG. 3, a concave mirror that is concave on the light source 12 side and the light reflecting surface 11 c side can be used as the reflecting member 18 of the edge light type illumination device 10. By using the reflecting member 18 as a concave mirror, the shape of the concave surface can be appropriately formed, and the light from the light source 12 can be condensed at a specific position on the light incident surface 11a of the light guide plate.
　反射部材１８に用いられる平面鏡、凹面鏡等は、ガラス板、プラスチックシート等の透明基材に、銀、アルミニウム、鉛等の真空蒸着等で形成された金属反射膜が形成された鏡を用いることができる。 As the flat mirror and concave mirror used for the reflecting member 18, a mirror in which a metal reflecting film formed by vacuum deposition of silver, aluminum, lead or the like is formed on a transparent base material such as a glass plate or a plastic sheet is used. it can.
　反射部材１８は、上記した鏡のような鏡面反射する反射部材以外に、乱反射する反射部材を用いてもよい。乱反射する反射部材としては例えば、バインダー樹脂中に酸化チタン、硫酸バリウム等の白色顔料をアクリル樹脂等のバインダー樹脂中に添加した塗料、インキ等により形成した白色反射層が挙げられる。白色反射層はガラス板、プラスチック板等の表面に形成される。 The reflection member 18 may be a reflection member that diffusely reflects in addition to the reflection member that reflects the surface like a mirror. Examples of the reflective member that diffusely reflects include a white reflective layer formed of a paint, ink, or the like in which a white pigment such as titanium oxide or barium sulfate is added to a binder resin such as an acrylic resin in a binder resin. The white reflective layer is formed on the surface of a glass plate, a plastic plate or the like.
　導光板１１は、方形状の透明な薄板から構成される。導光板１１はアクリル樹脂、ポリカーボネート樹脂、シクロオレフィン樹脂等の透明プラスチックから形成される。導光板１１の厚さは、通常、３～４ｍｍ程度に形成される。 The light guide plate 11 is composed of a rectangular transparent thin plate. The light guide plate 11 is formed from a transparent plastic such as acrylic resin, polycarbonate resin, or cycloolefin resin. The thickness of the light guide plate 11 is usually about 3 to 4 mm.
　図１に示すように、導光板１１は、光反射面１１ｃに、反射パターン１３が形成されている。更に導光板１１の反射パターン１３側には、導光板１１とは別体の反射シート１４が配置されている。 As shown in FIG. 1, the light guide plate 11 has a reflection pattern 13 formed on a light reflection surface 11c. Further, a reflection sheet 14 separate from the light guide plate 11 is disposed on the light guide plate 11 on the reflective pattern 13 side.
　反射パターン１３は、導光板１１の光反射面１１ｃの表面に、直接、スクリーン印刷等の印刷により形成されている。反射パターン１３は、酸化チタン、硫酸バリウム等の白色顔料をアクリル樹脂等のバインダー樹脂中に添加した塗料、インキ等により形成された複数の白色ドットからなる白色ドットパターンにより構成されている。 The reflection pattern 13 is formed directly on the surface of the light reflection surface 11c of the light guide plate 11 by printing such as screen printing. The reflection pattern 13 is configured by a white dot pattern composed of a plurality of white dots formed by paint, ink, or the like in which a white pigment such as titanium oxide or barium sulfate is added to a binder resin such as an acrylic resin.
　反射パターン１３のドットの大きさ、位置等の具体的なパターンは、光源１２から出た光を散乱させて反射させ、光放射面１１ｂから放射される光が、面全体で均一に放出可能に形成されていればよい。反射パターン１３は、例えば光源の近くは、ドット径が小さく、光源の遠くはドット径が大きく成るように形成することができる。具体的な反射パターンとしては、光源の種類や配置等に応じて適宜、公知の各種パターンを用いることができる。また反射パターン１３の形成は、印刷法以外に、射出成形等の成形法等を用いて形成することができる。 The specific pattern such as the size and position of the dots of the reflective pattern 13 is such that the light emitted from the light source 12 is scattered and reflected so that the light emitted from the light emitting surface 11b can be emitted uniformly over the entire surface. It only has to be formed. The reflection pattern 13 can be formed so that, for example, the dot diameter is small near the light source and the dot diameter is large near the light source. As the specific reflection pattern, various known patterns can be used as appropriate according to the type and arrangement of the light source. The reflective pattern 13 can be formed by using a molding method such as injection molding in addition to the printing method.
　反射シート１４は、導光板１１に入射した光源の光のうち、反射パターン１３で乱反射した光が、光放射面１１ｂに向かわずに反対側の光反射面１１ｃから抜ける光を、導光板１１の光放射面１１ｂ側に反射させるためのものである。反射シート１４は、例えば厚さが０．１～２ｍｍ程度の反射性を有するプラスチックシートが用いられる。 The light reflected from the light source 11 incident on the light guide plate 11 is diffused by the reflection pattern 13 and passes through the opposite light reflection surface 11c without going to the light emission surface 11b. This is for reflecting the light emitting surface 11b. As the reflection sheet 14, for example, a plastic sheet having a thickness of about 0.1 to 2 mm is used.
　反射シート１４は、鏡面反射、乱反射のいずれでも良い。鏡面反射の反射シート１４として、例えば、アルミニウムや銀等の金属を蒸着したポリエステルフィルム等が挙げられる。また乱反射する反射シート１４としては、導光板側の表面を白色に塗装したシート等が用いられる。このようなシートとしては例えば、白色ポリエステルフィルム、超白色ポリエステルフィルム、界面多重反射型反射シート、多孔質ＰＰ、微発泡ポリエステルシート等が挙げられる。 The reflection sheet 14 may be either specular reflection or irregular reflection. Examples of the specular reflection sheet 14 include a polyester film on which a metal such as aluminum or silver is deposited. Further, as the reflection sheet 14 that irregularly reflects, a sheet or the like whose surface on the light guide plate side is painted white is used. Examples of such a sheet include a white polyester film, an ultra-white polyester film, an interface multiple reflection type reflection sheet, a porous PP, a finely foamed polyester sheet, and the like.
　更に図１に示すエッジライト型照明装置１０は、導光板１１の反射パターン１３と反対側表面には、光学シート２０が配置されている。光学シート２０は、例えば、導光板の光放射面１１ｂ側から、拡散シート、レンズシート、偏光選択性反射シート等の複数枚のシートが順に配置されて構成されている。 Further, in the edge light type illumination device 10 shown in FIG. 1, an optical sheet 20 is disposed on the surface of the light guide plate 11 opposite to the reflection pattern 13. The optical sheet 20 is configured, for example, by sequentially arranging a plurality of sheets such as a diffusion sheet, a lens sheet, and a polarization selective reflection sheet from the light emitting surface 11b side of the light guide plate.
　上記拡散シートは、放射光の面方向における輝度をさらに均一化させるものである。上記レンズシートは、拡散シートを透過した光を集光し、輝度を高めるものである。上記偏光選択性反射シートは、液晶表示パネルに到達した光が、液晶パネルの偏光板に吸収されないよう、特定方向の偏光を透過し、それ以外の偏光を反射するものである。 The above diffusion sheet makes the luminance in the surface direction of the emitted light more uniform. The lens sheet collects the light transmitted through the diffusion sheet and increases the luminance. The polarization selective reflection sheet transmits polarized light in a specific direction and reflects other polarized light so that the light reaching the liquid crystal display panel is not absorbed by the polarizing plate of the liquid crystal panel.
　光学シート２０、導光板１１及び反射シート１４は、この順番で積層させた状態でフレーム５により、シャーシ４０に固定されている。フレーム５は、導光板１１の外周端部に沿って延在する枠状（額縁状）に形成されており、光学シート２０および導光板１１の外周端部をほぼ全周にわたって表側から押さえることが可能となっている。尚、フレーム５は、例えば黒色の合成樹脂製とされ、遮光性を有するものである。また、フレーム５は、液晶表示パネル３の外周端部の背面を、その枠状の前面で受けることが可能になっている（図４参照）。 The optical sheet 20, the light guide plate 11, and the reflection sheet 14 are fixed to the chassis 40 by the frame 5 in a state of being laminated in this order. The frame 5 is formed in a frame shape (frame shape) extending along the outer peripheral end portion of the light guide plate 11, and the outer peripheral end portions of the optical sheet 20 and the light guide plate 11 can be pressed from the front side over substantially the entire periphery. It is possible. The frame 5 is made of, for example, black synthetic resin and has a light shielding property. Further, the frame 5 can receive the back surface of the outer peripheral end portion of the liquid crystal display panel 3 with its frame-shaped front surface (see FIG. 4).
　図４は上記のエッジライト型照明装置をバックライトとして用いた表示装置の一例を示す分解斜視図である。図４に示す表示装置は、表示パネルとして液晶パネルを用いた液晶表示装置の例である。図４に示すように液晶表示装置１は、液晶表示パネル３と、この液晶表示パネル３に光を照射するためのバックライト装置であるエッジライト型照明装置１０とを備え、これらが枠状のベゼル２により一体的に保持されている。液晶表示パネル３は、エッジライト型照明装置１０の前面側の光放射面１１ｂ側に配置されている。 FIG. 4 is an exploded perspective view showing an example of a display device using the edge light type illumination device as a backlight. The display device illustrated in FIG. 4 is an example of a liquid crystal display device using a liquid crystal panel as a display panel. As shown in FIG. 4, the liquid crystal display device 1 includes a liquid crystal display panel 3 and an edge light type illumination device 10 that is a backlight device for irradiating the liquid crystal display panel 3 with light, and these are frame-shaped. The bezel 2 is integrally held. The liquid crystal display panel 3 is disposed on the light emitting surface 11 b side on the front side of the edge light type illumination device 10.
　ベゼル２は、液晶表示パネル３の周縁に被せられる額縁形状を有しており、エッジライト型照明装置１０が備えるシャーシ４０と共に液晶表示装置１全体の強度を確保するものである。 The bezel 2 has a frame shape that covers the periphery of the liquid crystal display panel 3, and ensures the strength of the entire liquid crystal display device 1 together with the chassis 40 included in the edge light type illumination device 10.
　液晶表示パネル３は、平面に視て横長の長方形状を有している。この液晶表示パネル３は、薄膜トランジスタ（ＴＦＴ）アレイ基板３ａとカラーフィルタ（ＣＦ）基板３ｂとからなる一対のガラス基板が所定の間隔を置いて平行に対向して貼り合わせられ、両ガラス基板間に液晶が封止された液晶層（図示しない）を有している。 The liquid crystal display panel 3 has a horizontally long rectangular shape when viewed from above. The liquid crystal display panel 3 includes a pair of glass substrates, each composed of a thin film transistor (TFT) array substrate 3a and a color filter (CF) substrate 3b, which are bonded in parallel with a predetermined distance therebetween. It has a liquid crystal layer (not shown) in which liquid crystal is sealed.
　上記ＴＦＴアレイ基板３ａには複数のＴＦＴおよび画素電極がマトリクス状に形成され、上記ＣＦ基板３ｂには複数の着色パターンがマトリクス状に形成されると共に、そのほぼ全面に共通電極が形成されており、これら画素電極と共通電極との間に印加する電圧を変化させて液晶を配向制御することで、画像を表示することができるようになっている。尚、液晶表示パネル３の表面と背面にはそれぞれ偏光板が配されている（図示しない）。 A plurality of TFTs and pixel electrodes are formed in a matrix on the TFT array substrate 3a, and a plurality of colored patterns are formed in a matrix on the CF substrate 3b, and a common electrode is formed on almost the entire surface. An image can be displayed by controlling the orientation of the liquid crystal by changing the voltage applied between the pixel electrode and the common electrode. A polarizing plate is provided on each of the front and back surfaces of the liquid crystal display panel 3 (not shown).
　シャーシ側面部４１には、フレーム５及びベゼル２がネジ止めされる。またシャーシ４０の背面には、ＬＥＤ基板１７に電源を供給する電源基板５１と、液晶表示パネル３を駆動するコントロール基板５２等が配設されている。 The frame 5 and the bezel 2 are screwed to the chassis side part 41. On the rear surface of the chassis 40, a power supply substrate 51 that supplies power to the LED substrate 17, a control substrate 52 that drives the liquid crystal display panel 3, and the like are disposed.
　図１に示すように、エッジライト型照明装置１０は、光源１２のＬＥＤから前面側に放射された光が、反射部材１１により導光板１１側面方向に反射する。反射部材１８により反射した光は、導光板の光入射面１１ａから導光板１１の内部に入射する。導光板１１の内部に入射した光は、導光板１１内を進み反射パターン１３により散乱する。散乱した光は、反射シート１４により光放射面１１ｂと光反射面１１ｃとの間で繰り返し反射し、その内部で平面状に広がり導光板１１の光放射面１１ｂから面状に放射される。光放射面１１ｂから放射した面状の光は、図２に示すように、光学シート２０の拡散シート、レンズシート、偏光選択性反射シート等を通過して、輝度、均一性等の光学的特性を向上させて液晶表示パネル３の背面側に照射される。 As shown in FIG. 1, in the edge light type illumination device 10, the light emitted from the LED of the light source 12 to the front side is reflected by the reflecting member 11 in the side surface direction of the light guide plate 11. The light reflected by the reflecting member 18 enters the light guide plate 11 from the light incident surface 11a of the light guide plate. Light incident on the inside of the light guide plate 11 travels through the light guide plate 11 and is scattered by the reflection pattern 13. The scattered light is repeatedly reflected between the light emitting surface 11b and the light reflecting surface 11c by the reflection sheet 14, spreads in a planar shape inside, and is emitted in a planar shape from the light emitting surface 11b of the light guide plate 11. As shown in FIG. 2, the planar light emitted from the light emitting surface 11b passes through the diffusion sheet, the lens sheet, the polarization selective reflection sheet, etc. of the optical sheet 20, and has optical characteristics such as luminance and uniformity. Is improved, and the back side of the liquid crystal display panel 3 is irradiated.
　本発明の表示装置は、表示パネルに外光を照射する外光照射装置として、上記エッジライト型照明装置を備えるものである。本発明の表示装置は、液晶表示装置として大型テレビジョン等に好適に利用することができる。また本発明の表示装置は、液晶表示装置に限定されるものではなく、表示パネルと外光照射装置を組み合わせて構成される表示装置であれば、各種の表示装置に利用することができる。 The display device of the present invention includes the edge light type illumination device as an external light irradiation device that irradiates the display panel with external light. The display device of the present invention can be suitably used for a large television or the like as a liquid crystal display device. The display device of the present invention is not limited to a liquid crystal display device, and can be used for various display devices as long as the display device is a combination of a display panel and an external light irradiation device.

Claims (8)

  1. 　前面が開口した開口部を有する箱形形状をしたシャーシと、該シャーシ内に配設される平板状の導光板と、該導光板の光入射面である側面より該導光板内に光を入射させるための光源と、を有し、
    　前記光源は、前記シャーシの内底面の前記導光板の外側に位置して配設され、該光源から出射された光を前記導光板の光入射面に向けて反射させるための反射部材を備えることを特徴とするエッジライト型照明装置。     A box-shaped chassis having an opening with an opening on the front surface, a flat light guide plate disposed in the chassis, and light incident on the light guide plate from a side surface that is a light incident surface of the light guide plate A light source for causing
    The light source includes a reflecting member that is disposed outside the light guide plate on the inner bottom surface of the chassis and reflects light emitted from the light source toward the light incident surface of the light guide plate. An edge light type illumination device characterized by the above.
  2. 　前記反射部材が、平面鏡であることを特徴とする請求項１記載のエッジライト型照明装置。 2. The edge light type illumination device according to claim 1, wherein the reflecting member is a plane mirror.
  3. 　前記反射部材が、凹面鏡であることを特徴とする請求項１記載のエッジライト型照明装置。 2. The edge light type illumination device according to claim 1, wherein the reflecting member is a concave mirror.
  4. 　前記光源は、複数のＬＥＤが前記導光板の側面長手方向に長尺のＬＥＤ基板上に列設されていることを特徴とする請求項１～３のいずれか１項に記載のエッジライト型照明装置。 The edge light illumination according to any one of claims 1 to 3, wherein the light source includes a plurality of LEDs arranged on an LED substrate that is long in a longitudinal direction of the side surface of the light guide plate. apparatus.
  5. 　前記シャーシが金属製であり、前記光源は放熱板を介して前記シャーシ底面部に装着されていることを特徴とする請求項１～４のいずれか１項に記載のエッジライト型照明装置。 The edge light type illumination device according to any one of claims 1 to 4, wherein the chassis is made of metal, and the light source is mounted on the bottom surface of the chassis via a heat sink.
  6. 　前記放熱板がアルミニウム製であることを特徴とする請求項５記載のエッジライト型照明装置。 6. The edge light type illumination device according to claim 5, wherein the heat radiating plate is made of aluminum.
  7. 　上記請求項１～６のいずれか１項に記載のエッジライト型照明装置を、表示パネルの外光照射装置として用いたことを特徴とする表示装置。 A display device comprising the edge light type illumination device according to any one of claims 1 to 6 as an external light irradiation device for a display panel.
  8. 　前記表示パネルが液晶表示装置であることを特徴とする請求項７記載の表示装置。 The display device according to claim 7, wherein the display panel is a liquid crystal display device.
PCT/JP2011/073824 2010-11-25 2011-10-17 Edge light illuminating device and display device WO2012070331A1 (en)

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EP2887135A1 (en) * 2013-12-18 2015-06-24 Samsung Electronics Co., Ltd Display device
TWI639870B (en) * 2016-04-22 2018-11-01 日商川崎重工業股份有限公司 Light guide plate and surface lighting device

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JP2005079038A (en) * 2003-09-03 2005-03-24 Harison Toshiba Lighting Corp Backlight device using light emitting diode
JP2007207615A (en) * 2006-02-02 2007-08-16 Mitsubishi Electric Corp Planar light source device, and display device using the same
JP2009260050A (en) * 2008-04-17 2009-11-05 Toyoda Gosei Co Ltd Light-emitting device

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JP2009260050A (en) * 2008-04-17 2009-11-05 Toyoda Gosei Co Ltd Light-emitting device

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Publication number Priority date Publication date Assignee Title
EP2887135A1 (en) * 2013-12-18 2015-06-24 Samsung Electronics Co., Ltd Display device
US9447958B2 (en) 2013-12-18 2016-09-20 Samsung Electronics Co., Ltd. Display device
TWI639870B (en) * 2016-04-22 2018-11-01 日商川崎重工業股份有限公司 Light guide plate and surface lighting device

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