WO2012128193A1 - Dispositif d'éclairage et dispositif d'affichage - Google Patents

Dispositif d'éclairage et dispositif d'affichage Download PDF

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Publication number
WO2012128193A1
WO2012128193A1 PCT/JP2012/056815 JP2012056815W WO2012128193A1 WO 2012128193 A1 WO2012128193 A1 WO 2012128193A1 JP 2012056815 W JP2012056815 W JP 2012056815W WO 2012128193 A1 WO2012128193 A1 WO 2012128193A1
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WO
WIPO (PCT)
Prior art keywords
end surface
light guide
led
guide plate
light
Prior art date
Application number
PCT/JP2012/056815
Other languages
English (en)
Japanese (ja)
Inventor
寺島　健太郎
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 WO2012128193A1 publication Critical patent/WO2012128193A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • 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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]

Definitions

  • the present invention relates to a lighting device and a display device.
  • liquid crystal panels have been widely used as display units for televisions, mobile phones, portable information terminals and the like. Since the liquid crystal panel cannot emit light by itself, in order to display an image, the light of a separately prepared illumination device (so-called backlight) is used.
  • This illuminating device is arranged on the back side of the liquid crystal panel, and is configured to irradiate light spreading in a plane toward the back side of the liquid crystal panel.
  • the illuminating device one having a light guide plate and a light source unit arranged so as to face the end face of the light guide plate is known.
  • This type of lighting device is generally known as a side light type (or edge light type), and as the light source unit, for example, a plurality of LEDs and LEDs on which these LEDs are mounted. What is provided with a board
  • the light guide plate and the light source unit are accommodated in a box-shaped chassis.
  • each LED mounted on the LED substrate toward the end face of the light guide plate When light is emitted from each LED mounted on the LED substrate toward the end face of the light guide plate, the light enters the inside from the end face of the light guide plate and is laid under the light guide plate. The light advances through the light guide plate while being reflected by the reflecting sheet or the like. Then, the light is emitted as planar light from the surface of the light guide plate. The light emitted from the surface of the light guide plate passes through a transparent resin optical sheet disposed on the surface side of the light guide plate, and illuminates the liquid crystal panel from the back side.
  • the end face of the light guide plate is generally formed perpendicular to the front or back surface of the light guide plate. Moreover, as shown in Patent Document 1, some are formed so as to be inclined with respect to the front surface or the back surface of the light guide plate.
  • the size of the LED is preferably set so as to be within the end face of the light guide plate so as not to protrude from the end face of the light guide plate. Therefore, when the light guide plate is thin, the size of the LED used is generally small.
  • a small one for example, one having a width of 1.5 mm or less
  • LED packages general-purpose LEDs (LED packages)
  • the efficiency of converting blue light into white light is low, and the light emission efficiency is poor. Therefore, when the thickness of the light guide plate is small and a small LED that fits within the end face of the light guide plate is used, it is difficult to ensure sufficient brightness of the lighting device.
  • An object of the present invention is to provide a technique capable of setting a large end face on which light is incident without increasing the thickness of the light guide plate.
  • the lighting device includes a receiving member having a bottom plate and a side wall rising from the bottom plate, a pair of plate surfaces parallel to each other, and an inclined end surface inclined with respect to the plate surface, and the plate surface
  • a light source plate having a light guide plate arranged in the housing member so that one of the LED faces the bottom plate, an LED that emits light from a front end surface, and an LED substrate on which the LED is mounted; And a support member disposed in the housing member while supporting the light source unit so that a front end surface faces the inclined end surface.
  • the illuminating device can set the width of the inclined end surface on which light is incident to be large without increasing the thickness of the light guide plate by inclining the inclined end surface of the light guide plate with respect to the plate surface of the light guide plate.
  • the support member may be made of a heat dissipation material and connected to the bottom plate and the side wall.
  • the lighting device can release heat generated from the light source unit to the bottom plate and the side wall via a support member.
  • the inclined end surface may be inclined with respect to the plate surface so as to look down on the bottom plate.
  • the front end surface of the LED and the inclined end surface are arranged in parallel to each other, and the width h (mm) of the front end surface of the LED in a direction corresponding to the inclination direction of the inclined end surface,
  • the relationship with the thickness t (mm) of the light guide plate may be 0.8 ⁇ t / h ⁇ 1.2.
  • a thickness t (mm) of the light guide plate may be 0.5 ⁇ t ⁇ 3.
  • an angle ⁇ (°) formed by the thickness direction of the light guide plate and the inclination direction of the inclined end surface is 0 ⁇ ⁇ 90 ⁇ arc ⁇ sin (1 / n) (where n is a value of the light guide plate) (Refractive index).
  • the plate surface on which the principal ray emitted from the front end surface of the LED first hits after passing through the inclined end surface is more than the portion on which the principal ray strikes. It is preferable to have a light leakage prevention part in the outer edge side part.
  • the support member has a notch groove.
  • the display device includes a display panel that performs display using light from the illumination device.
  • the display panel may be a liquid crystal panel using liquid crystal.
  • FIG. 3 is a plan view of the liquid crystal display device according to the first embodiment.
  • Cross section of liquid crystal display Enlarged sectional view of a liquid crystal display device
  • Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 3.
  • the liquid crystal display device 10 will be described as an example.
  • FIG. 1 is a plan view of the liquid crystal display device of Embodiment 1
  • FIG. 2 is a cross-sectional view of the liquid crystal display device
  • FIG. 3 is an enlarged cross-sectional view of the liquid crystal display device.
  • the X axis, the Y axis, and the X axis are shown in each drawing.
  • the liquid crystal display device 10 has a substantially rectangular appearance when viewed from the front side.
  • FIG. 1 shows a rectangular liquid crystal panel 11 and a frame-shaped bezel 13 surrounding the outer edge portion of the liquid crystal panel 11.
  • FIG. 2 shows a cross-sectional view of the liquid crystal display device 10 cut along the long side direction.
  • the liquid crystal display device 10 mainly includes a liquid crystal panel (an example of a display panel) 11 that displays an image, a backlight device (an example of an illumination device) 12, a bezel 13, and a frame 14. ing.
  • the liquid crystal display device 10 of this embodiment is used as a display unit of various electronic devices such as a portable information terminal, a mobile phone, a notebook computer, a portable television receiver, and a portable game machine.
  • the liquid crystal panel 11 is rectangular in appearance, and mainly includes a pair of transparent glass substrates facing each other and a liquid crystal layer sealed between these substrates.
  • one glass substrate disposed on the back side (back side) is a thin film transistor (hereinafter, TFT) array substrate
  • the other glass substrate disposed on the display surface side (front side) is A color filter (hereinafter referred to as CF) substrate.
  • the liquid crystal panel 11 of FIG. 1 shows the display surface 11a side (front side). 2 and 3, the upper side is the display surface 11a side (front side) of the liquid crystal panel 11, and the lower side thereof is the back surface 11b side (back side) of the liquid crystal panel.
  • the TFT array substrate is mainly composed of a plurality of TFTs as switching elements and a plurality of transparent pixel electrodes connected to the drain electrodes of each TFT in a matrix (matrix) on a transparent glass plate. It consists of what is provided. Individual TFTs and pixel electrodes are provided for each pixel, and are partitioned by a plurality of gate wirings and a plurality of source wirings provided on the glass plate so as to cross each other. . Note that the gate electrode in each TFT is connected to the gate wiring, and the source wiring is connected to the source wiring.
  • the TFT array substrate is formed with an alignment film for regulating the alignment of liquid crystal molecules contained in the liquid crystal layer.
  • the CF substrate is mainly formed on a transparent glass plate so that the CF composed of each color such as red (R), green (G), and blue (B) corresponds to each pixel of the TFT array substrate. It consists of what was provided in matrix form.
  • Each CF is partitioned by a light-shielding black matrix (hereinafter referred to as BM) provided in a lattice pattern on the glass plate.
  • BM light-shielding black matrix
  • an alignment film for regulating the alignment of the liquid crystal molecules is provided.
  • Image data and various control signals necessary for displaying an image are supplied to the above-described source wiring, gate wiring, counter electrode, and the like from a drive circuit board (not shown) provided in the liquid crystal display device 10. It is configured.
  • the liquid crystal panel 11 is driven by a so-called active matrix method.
  • the liquid crystal panel 11 is provided with polarizing plates on the display surface side and the back surface side so as to sandwich the pair of glass substrates.
  • the illuminating device 12 is a so-called edge light type (side light type) backlight. As shown in FIGS. 2 and 3, the illuminating device 12 mainly includes a chassis (an example of a housing member) 15, a light guide plate 16, and a light source. A unit 17, a support member (heat dissipation member) 18, an optical sheet 19, and a reflection sheet 20 are provided.
  • the chassis 15 is a shallow box with an upper opening, and is obtained by pressing a plate material made of a metal material such as an aluminum-based material. In other embodiments, the chassis 15 may be manufactured using a plastic material. In addition, as a material utilized for the chassis 15, what has moderate rigidity and is excellent in heat dissipation (for example, the said metal material) is preferable.
  • the chassis 15 includes a bottom plate 15a having a rectangular appearance when viewed from the front side, and a side wall 15b formed so as to stand up at the peripheral edge of the bottom plate 15b.
  • the surface of the bottom plate 15a is set so that the peripheral portion adjacent to the side wall 15b is lower than the central portion thereof. That is, a recess 15c is formed in a portion adjacent to the side wall 15b, and the surface of the bottom plate 15a in that portion is set to be one step lower than the surface of the central portion.
  • the surface of the bottom plate 15a in the central portion is processed to be substantially flat. Further, the portion corresponding to the bottom of the recess 15c is also processed to be substantially flat.
  • the thickness of the bottom plate 15a in the said hollow 15c is set smaller (thinner) than the thickness of the bottom plate 15a in the said center part.
  • the recess 15c serves as a place (space) for accommodating the support member 18 that supports the light source unit 17.
  • the reflection sheet 20 has a rectangular shape whose appearance is slightly smaller than the bottom plate 15a, and is made of a white foamed plastic sheet (for example, a foamed polyethylene terephthalate sheet).
  • the reflection sheet 20 is accommodated in the box-shaped chassis 15 so as to cover the surface of the bottom plate 15a.
  • the reflection sheet 20 covers the entire surface of the bottom plate 15a in the central portion that is set one step higher than the depression 15c.
  • the outer edge portion of the reflection sheet 20 is set so that it does not reach the side wall 15b but slightly reaches the recess 15c.
  • the light guide plate 16 is made of a transparent plate-like member having a predetermined thickness t (mm), and is manufactured using a highly transparent material such as acrylic resin.
  • the appearance of the light guide plate 16 when viewed from the plate surface (front surface 16a or back surface 16b) side is generally rectangular. That is, the front plate surface (front surface 16a) of the light guide plate 16 and the back plate surface (back surface 16b) are both rectangular.
  • the front surface 16a and the back surface 16b of the light guide plate 16 facing each other are both flat and parallel to each other.
  • the pair of plate surfaces (the front surface 16a and the back surface 16b) of the light guide plate 16 is not limited to the case where both plate surfaces are completely parallel to each other.
  • the thickness t (mm) of the light guide plate 16 is a distance between the front surface 16a and the back surface 16b.
  • a desirable range for the thickness t (mm) of the light guide plate is 0.5 ⁇ t ⁇ 3. If the thickness t (mm) of the light guide plate 16 is less than 0.5, the thickness is too thin, so that a margin when the end surface 16c of the light guide plate 16 is inclined cannot be expected. This margin takes into account variations in the LEDs 172 mounted on the LED substrate 171. Further, when the thickness t (mm) of the light guide plate 16 exceeds 3, the thickness becomes large (thick), so that it is not necessary to incline the end surface 16c of the light guide plate 16 to earn a margin.
  • the pair of end surfaces 16c and 16c on the short side of the light guide plate 16 are both inclined with respect to the front surface 16a or the back surface 16b.
  • the inclined end surface 16c may be particularly referred to as an inclined end surface 16c.
  • the surface of the inclined end surface 16c is flat, and as shown in FIGS. 2 and 3, is inclined so as to climb from the back surface 16b side toward the front surface 16a side.
  • the inclined end surface 16c is inclined so as to face upward (open) of the chassis 15.
  • the inclined end surface 16c is sandwiched between the short side on the front surface 16a side and the short side on the back surface 16b side. In the present embodiment, the distance (shortest distance) between them is the width of the inclined end face 16c.
  • An angle ⁇ (°) (see FIG. 3) formed by the width direction of the inclined end surface 16c and the thickness direction (Z-axis direction) of the light guide plate 16 (that is, the normal direction of the front surface 16a or the back surface 16b) is an LED 172 described later. Is set to be equal to or smaller than the critical angle of the chief ray L emitted from.
  • a specific range of the angle ⁇ (°) is 0 ⁇ ⁇ 90 ⁇ arc ⁇ sin (1 / n).
  • n is the refractive index of the light guide plate.
  • the pair of end faces on the long side of the light guide plate 16 are both perpendicular to the front surface 16a or the back surface 16b.
  • a light scattering portion (not shown) is provided on the back surface 16 b of the light guide plate 16.
  • the light scattering portion is configured by a white dot pattern and has a function of scattering and reflecting light.
  • the light scattering portion is formed by printing a paste containing a white pigment such as a metal oxide on the back surface 16b of the light guide plate 16 using a silk screen printer.
  • the light guide plate 16 is accommodated in the chassis 15 such that the back surface 16b faces the bottom plate 15a.
  • the light guide plate 16 is placed on the bottom plate 15 a via the reflection sheet 20.
  • the light guide plate 16 is disposed on the bottom plate 15a so that the inclined end surface 16c is adjacent to the recess 16c.
  • the light source unit 17 mainly includes an LED (Light Emitting Diode) 172 as a light source and an LED substrate 171 on which the LED 172 is mounted.
  • the LED 172 is formed by sealing a plurality of LED chips in a housing with a resin material or the like (so-called LED package), and is configured to emit white light.
  • the LED 172 includes, for example, three types of LED chips having different main emission wavelengths. Specifically, each LED chip emits red (R), green (G), and blue (B) in a single color. Is configured to do.
  • the LED 172 is not limited to such a configuration, and may have another configuration.
  • LED 172 examples include, for example, a built-in LED chip that emits blue (B) in a single color, a phosphor having an emission peak in the red (R) region, and an emission peak in the green (G) region.
  • the LED chip may be covered with a resin mixed with a phosphor (for example, a silicon-based resin).
  • a resin for example, a silicon-based resin in which an LED chip that emits blue (B) in a single color is incorporated and a phosphor that emits yellow light such as YAG (yttrium, aluminum, garnet) phosphor is mixed.
  • the LED chip may be covered.
  • the LED 172 of the present embodiment is a rectangular parallelepiped whose appearance is flat, and light is emitted from a rectangular tip surface 172a. As will be described later, the LED 172 is disposed in the chassis 15 so as to face the inclined end surface 16 c of the light guide plate 16. Of the front end surface 172a, the width (length) h (mm) in the direction corresponding to the width direction of the inclined end surface 16c does not protrude from the inclined end surface 16c in order to increase the light use efficiency. It is preferable that the width is set to be equal to or less than the width of the.
  • the relationship between the width h (mm) of the tip surface 172a of the LED 172 and the thickness t (mm) of the light guide plate 16 is preferably 0.8 ⁇ t / h ⁇ 1.2. If the width h (mm) of the front end surface 172a satisfies the above relationship, for example, even if the width h of the front end surface 172a is larger than the thickness t (mm) of the light guide plate 16, the inclined end surface By using 16c, light leakage of the LED 172 can be suppressed. Therefore, a general-purpose LED having a relatively high width h and a high brightness can be used.
  • the LED substrate 171 includes a long (band-shaped) base material made of a metal material such as an aluminum material, an insulating layer made of a synthetic resin formed on the base material, and copper formed on the insulating layer.
  • a wiring pattern made of a metal film such as a foil and a white insulating film formed on the insulating layer so as to cover the wiring pattern are provided.
  • the base material, the insulating layer, the metal film, and the insulating film are collectively shown as one LED substrate 171 in FIGS.
  • a plurality of LEDs 172 are mounted in a line. The LEDs 172 are connected to each other in series by the wiring pattern.
  • the lighting device 12 includes an LED driver (not shown). By the LED driver, current is supplied to each LED 172 on the LED substrate 171, and each LED 172 is driven by PWM (Pulse Width Modulation) control.
  • PWM Pulse Width Modulation
  • the support member 18 is accommodated in the chassis 15 while supporting the light source unit 17.
  • the support member 18 of the present embodiment is made of a material excellent in heat dissipation (hereinafter referred to as a heat dissipation material).
  • the heat dissipation material include metal materials such as aluminum-based materials.
  • the external shape of the support member 18 is a prismatic shape that extends straight so that the long light source unit 17 can be supported.
  • the cross-sectional shape of the support member 18 (the cross-sectional shape of the support member 18 cut so as to be orthogonal to the longitudinal direction) is a combination of a rectangle and a triangle, as shown in FIGS. Yes.
  • the support member 18 is disposed in the recess 15 c of the bottom plate 15 a in the chassis 15.
  • the support member 18 is attached to the chassis 15 by using known fixing means such as screwing and adhesive.
  • the support member 18 will be described by dividing it into a portion 18b having a rectangular cross section and a portion 18c having a triangular cross section.
  • a portion 18 b having a rectangular cross section is in close contact with the side wall 15 b and the bottom plate 15 a of the chassis 15.
  • the long side portion of the portion 18b having a rectangular cross section is in close contact with the inner surface of the side wall 15b.
  • the portion on the short side is in close contact with the surface of the bottom plate 15a corresponding to the bottom of the recess 15c.
  • the support member 18 is connected to the side wall 15 b and the bottom plate 15 a of the chassis 15, and heat generated from the light source unit 17 can be easily released to the chassis 15 via the support member 18.
  • the portion 18b having a rectangular cross section of the support member 18 has a flat plate shape extending upward along the side wall 15b.
  • the portion 18c having a triangular cross section in the support member 18 is closer to the light guide plate 16 in the chassis 15 than the portion 18b having a rectangular cross section.
  • the section 18c having a triangular cross section has an attachment surface 18a inclined so as to face the bottom plate 15a, and the LED substrate 171 of the light source unit 17 is attached to the attachment surface 18a.
  • the LED substrate 171 is fixed on the mounting surface 18a with respect to the support member 18 by using a known fixing means such as an adhesive or screwing.
  • the support member 18 supports the light source unit 17 so that the front end surface 172a of the LED 172 and the inclined end surface 16c of the light guide plate 16 are arranged in parallel to each other. A slight gap is provided between the front end surface 172 a of the LED 172 and the inclined end surface 16 c of the light guide plate 16 in consideration of thermal expansion of the light guide plate 16.
  • a plurality of light source units 17 are provided in the chassis 15 (in the case of the present embodiment) so as to face the pair of end surfaces (inclined end surfaces) 16c, 16c on the short side of the light guide plate 16, respectively. 2) (see FIG. 2).
  • the optical sheet 19 is composed of a laminate of a diffusion sheet, a lens sheet, and a reflective polarizing sheet.
  • the external shape of the optical sheet 19 is rectangular when viewed from the front side, and is placed on the surface 16 a so as to cover the surface 16 a of the light guide plate 16.
  • the diffusion sheet is made of, for example, a laminate of a light-transmitting substrate made of synthetic resin and a diffusion layer in which light scattering particles are dispersed and mixed. This diffusion sheet has a function of diffusing light emitted from the surface 16 a of the light guide plate 16.
  • the lens sheet has a function of adjusting the traveling direction of light that has passed through the diffusion sheet, for example, from a surface in which a convex lens is formed on the surface of a translucent base material made of synthetic resin.
  • the reflective polarizing sheet has a function of reflecting linearly polarized light having a vibration plane orthogonal to the transmission polarization axis. As shown in FIGS. 2 and 3, the liquid crystal panel 11 is disposed above the optical sheet 19.
  • the frame 14 has a frame shape and is made of synthetic resin.
  • the frame 14 is black and has a light shielding property.
  • the frame 14 is placed on the chassis 15 containing the light guide plate 16, the optical sheet 19, and the like from the opened upper side. That is, the frame 14 is put on the chassis 15 so as to cover the tip portion of the side wall 15b.
  • the inner peripheral edge of the frame 14 extends in a bowl shape from the side wall 15b side of the chassis 14, and the extended portion causes the peripheral edge on the surface 16a of the light guide plate 16, the light source unit 17, the support member 18, and the like. Is covered.
  • the frame 14 is fixed to the side wall 15b of the chassis 15 by screws or the like. Further, the peripheral edge of the liquid crystal panel 11 is placed on the inner peripheral edge of the frame 14. Thus, the frame 14 supports the liquid crystal panel 11 from the back side.
  • the liquid crystal panel 11 is fixed to the illuminating device 12 with its outer peripheral edge sandwiched between a frame 14 and a frame-like bezel 13 covered from the upper side of the frame 14.
  • the bezel 13 is made of metal, and is fixed to the side wall 15b of the chassis 15 together with the frame 14 by screwing or the like.
  • each LED 172 of the light source unit 17 included in the illumination device 12 emits light.
  • the light is emitted from the front end surface 172a of the LED 172.
  • each LED 172 emits light light enters the inclined end surface 16c of the light guide plate 16 into the inside thereof.
  • the incident light is reflected by the reflection sheet 20 laid on the back surface 16 b side of the light guide plate 16, a light scattering portion (not shown) formed on the back surface 16 b of the light guide plate 16, etc.
  • the light exits from the surface 16a while proceeding inside.
  • the emitted light passes through the optical sheet 19 and spreads into a planar shape, and illuminates the liquid crystal panel 11 from the back surface 11b side.
  • the liquid crystal panel 11 uses the light from the illumination device 12 to display an image on the surface thereof.
  • FIG. 3 shows the principal ray L emitted from the LED 172.
  • This chief ray L is emitted straight from the substantially central portion of the tip surface 172a of the light emitted from the LED 172 along its normal direction.
  • the principal ray L enters the light guide plate 16 from the inclined end surface 16 c and is reflected by the back surface 16 b of the light guide plate 16. That is, the principal ray L first strikes the back surface 16 b of the pair of plate surfaces of the light guide plate 16.
  • the end face (inclined end face 16c) of the light guide plate 16 of the illumination device 12 of the present embodiment is inclined.
  • the light source unit 17 is supported by the support member 18 so that the tip end surface 172a of the LED 172 faces the inclined end surface (inclined end surface 16c).
  • the thickness t (mm) of the light guide plate 16 is increased by inclining the end surface (inclined end surface 16c) of the light guide plate 16 with respect to the plate surface (front surface 16a or back surface 16b) of the light guide plate 16.
  • the width of the end face (inclined end face 16c) on which light is incident can be set large.
  • the width of the LED 172 opposed to the inclined end face 16 can be set large, and a high-luminance general-purpose LED can be used as the LED 172.
  • a high-luminance general-purpose LED can be used as the LED 172.
  • the lighting device 12 of the present embodiment is configured such that the light source unit 17 is inclined with respect to the plate surface (the front surface 16a or the back surface 16b) of the light guide plate 16 or the bottom plate 15a using the support member 18. It is fixed inside.
  • the light source unit 17 is fixed to the support member 18 in a state where the LED substrate 171 is mounted on a mounting surface 18c inclined toward the bottom plate 15a side.
  • the light source unit 17 is fixed in a stable state in the chassis 15 using the support member 18.
  • the support member 18 that supports the light source unit 17 is made of a heat dissipation material, and is connected to the bottom plate 15a and the side wall 15b of the chassis 15. Therefore, the heat generated from the light source unit 17 when the LED 172 is turned on can first move to the support member 18 and further to the chassis 15.
  • the chassis 15 is cooled by outside air. Therefore, the lighting device 12 of the present embodiment can efficiently release the heat generated from the light source unit 17 to the chassis 15 via the support member 18.
  • FIG. 4 is a cross-sectional view of the liquid crystal display device 10A according to the second embodiment.
  • the portion of the liquid crystal display device 10A shown in FIG. 4 corresponds to the portion of the liquid crystal display device 10 of the first embodiment shown in FIG.
  • the basic structure of the liquid crystal display device 10A of the present embodiment is the same as that of the first embodiment.
  • the liquid crystal display device 10A of the present embodiment is different from that of the first embodiment in the structure of the support member 18A.
  • the support member 18A will be mainly described.
  • the illumination device 12A included in the liquid crystal display device 10A supports the light source unit 17 by a support member 18A.
  • the appearance of the support member 18A is substantially the same as that of the first embodiment, except that a notch groove 18d is provided in a portion in contact with the side wall 15b.
  • a plurality of the cutout grooves 18d are provided in the longitudinal direction (X-axis direction) of the support member 18A.
  • the notch groove 18d is provided in order to increase the surface area of the support member 18A made of a heat dissipation material compared to that of the first embodiment.
  • the heat dissipation efficiency of the support member 18A may be improved by forming the notch groove 18d in the support member 18A.
  • FIG. 5 is a cross-sectional view of the liquid crystal display device 10B of the third embodiment.
  • the portion of the liquid crystal display device 10B shown in FIG. 5 corresponds to the portion of the liquid crystal display device of the first embodiment shown in FIG.
  • the basic structure of the liquid crystal display device 10B of this embodiment is the same as that of the first embodiment.
  • the liquid crystal display device 10 ⁇ / b> B of the present embodiment is different from that of the first embodiment in that the light leakage prevention unit 21 is provided.
  • the light leakage prevention unit 21 will be mainly described.
  • a light leakage prevention portion 21 having a white surface is provided between the outer edge portion of the light guide plate 16 on the back surface 16b side and the reflection sheet 20.
  • the light omission prevention unit 21 is made of, for example, a double-sided tape whose surface is white.
  • this light omission prevention part 21 is provided in the part of an outer edge side rather than the part where the chief ray L of LED172 strikes the back surface 16b first. If the light omission prevention portion 21 is provided in this portion, the light hitting that portion is easily guided into the light guide plate 16. As a result, the illuminating device 12B of this embodiment can further improve the utilization efficiency of the light emitted from the LED.
  • FIG. 6 is a cross-sectional view of the liquid crystal display device 10C according to the fourth embodiment.
  • the portion of the liquid crystal display device 10C shown in FIG. 6 corresponds to the portion of the liquid crystal display device of Embodiment 1 shown in FIG.
  • the basic structure of the liquid crystal display device 10C of this embodiment is the same as that of the first embodiment.
  • the liquid crystal display device 10C of the present embodiment is different from that of the first embodiment in the structure of the light guide plate 16C, the support member 18C, and the like.
  • the light guide plate 16C, the support member 18C, and the like will be mainly described.
  • the illuminating device 12C provided in the liquid crystal display device 10C is inclined such that the inclined end surface 16Cc of the light guide plate 16C facing the light source unit 17 is directed toward the bottom plate 15a (looking down on the bottom plate 15a).
  • the inclined end surface 16Cc of the present embodiment is reversely inclined compared to the inclined end surface 16c of the first embodiment.
  • the angle ⁇ (°) formed by the width direction of the inclined end face 16Cc and the thickness direction (Z-axis direction) of the light guide plate 16C (that is, the normal direction of the front surface 16Ca or the back surface 16Cb) is as shown in FIG. And on the back surface 16Cb side of the light guide plate 16C.
  • the shape of the support member 18Cc that supports the light source unit 17 is also different from that of the first embodiment.
  • the support member 18 ⁇ / b> Cc of this embodiment has a substantially prismatic shape that extends straight so that the long light source unit 17 can be supported, as in the first embodiment.
  • the cross-sectional shape is a combination of a rectangle and a triangle, which are different from those of the first embodiment.
  • the section 18Cb having a rectangular cross section is in close contact with the side wall 15b and the bottom plate 15a of the chassis 15 as in the first embodiment, but its thickness (thickness in the Y-axis direction) is thinner than that in the first embodiment. It has become.
  • the section 18Cc having a triangular cross section is located on the light guide plate 16C side in the chassis 15 as compared with the section 18Cb having a rectangular cross section, as in the first embodiment, but the mounting surface 18Ca provided in the section 18Cc is located on the upper side. Inclined to head towards. Further, the lower portion of the triangular section 18Cc is in close contact with the bottom plate 15a of the chassis 15. Note that the support member 18C that supports the light source unit 17 is disposed in a recess 15c formed in the bottom plate 15a, as in the first embodiment.
  • the support member 18C has a larger contact area with the bottom plate 15a than that of the first embodiment. And the back surface side of LED board 171 is orient
  • the bottom plate 15a of the chassis 15 is larger than the side wall 15b and has a large area in contact with the outside air.
  • the liquid crystal display device 10 ⁇ / b> C of the present embodiment can easily release the heat generated from the light source unit 17 to the outside, and is excellent in heat dissipation efficiency.
  • the liquid crystal display device 10C of the present embodiment is also provided with the light leakage prevention unit 22 on the light guide plate 16C, as in the third embodiment.
  • the light leakage prevention unit 22 is provided between the light guide plate 16 ⁇ / b> C and the optical sheet 19, unlike the third embodiment.
  • This light omission prevention part 22 consists of a double-sided tape whose front surface (and back surface) is white.
  • the light emitted from the LED 172 is reliably reflected by the light omission prevention portion 22 and is externally transmitted from the outer edge portion on the surface 16Ca side of the light guide plate 16C. In addition, it is possible to prevent light from being lost.
  • the illuminating device 12C of this embodiment can further improve the utilization efficiency of the light emitted from the LED 172.
  • this light omission prevention part 22 is provided in the part of an outer edge side rather than the location where the chief ray L of LED172 strikes the surface 16Ca first.
  • the cross-sectional shape of the support member is a combination of a rectangle and a triangle.
  • the optical unit is not limited to this, and the optical unit is inclined by the light guide plate.
  • Other shapes may be used as long as they can be supported so as to face the end surface.
  • the case where the cross-sectional shape of the support member of Embodiment 4 consists only of a triangle may be sufficient.
  • the recess is provided in the bottom plate of the chassis.
  • the support member can be accommodated so that the optical unit can be opposed to the inclined end surface of the light guide plate.
  • the recess may not be formed in the bottom plate of the chassis.
  • the light source unit is disposed along the pair of end surfaces on the short side of the light guide plate.
  • the light source unit is disposed along the pair of end surfaces on the long side. It may be arranged.
  • the light source unit may be disposed so as to face any one end face, or the light source unit may be placed so as to face all end faces.
  • the thickness of the light guide plate is uniform.
  • the thickness of the light guide plate may not be uniform as long as the object of the present invention can be achieved.
  • SYMBOLS 10 Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12 ... Illuminating device, 13 ... Bezel, 14 ... Frame, 15 ... Chassis (housing member), 15a ... Bottom plate, 15b ... Side wall, 15c ... Indentation, 16 ... light guide plate, 16a ... surface (plate surface), 16b ... back surface (plate surface), 16c ... tilted end surface, 17 ... light source unit, 171 ... LED substrate, 171a ... substrate surface, 172 ... LED, 172a ... tip Surface (light-emitting surface), 18 ... support member, 18a ... mounting surface, t ... thickness of light guide plate, h ... width of tip surface of LED

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

Abstract

L'invention porte sur un dispositif d'éclairage (12), qui comporte : un élément de contenant (15), qui comporte une plaque inférieure (15a) et une paroi latérale (15b) s'étendant vers le haut à partir de la plaque inférieure (15a) ; une plaque de guidage de lumière (16), qui comporte une paire de surfaces de plaque (16a, 16b) qui sont parallèles entre elles et une surface d'extrémité inclinée (16c) qui est inclinée par rapport à la surface de plaque (16a), et qui est disposée à l'intérieur de l'élément de contenant (15), de sorte que la surface de plaque (16b) fasse face à la plaque inférieure (15a) ; une unité de source de lumière (17) qui comprend une diode électroluminescente (172) qui émet de la lumière à partir d'une surface d'extrémité avant (172a) et un substrat de diode électroluminescente (171) sur lequel est montée la diode électroluminescente (172) ; et un élément de support (18) qui est disposé à l'intérieur de l'élément de contenant (15) et qui supporte l'unité de source de lumière (17) de sorte que la surface d'extrémité avant (172a) de la diode électroluminescente (172) fasse face à la surface d'extrémité inclinée (16c).
PCT/JP2012/056815 2011-03-23 2012-03-16 Dispositif d'éclairage et dispositif d'affichage WO2012128193A1 (fr)

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JP2011-064178 2011-03-23
JP2011064178 2011-03-23

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WO2012128193A1 true WO2012128193A1 (fr) 2012-09-27

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CN103115265A (zh) * 2013-01-29 2013-05-22 余姚付世光电科技有限公司 全反射led面板灯
CN103162193A (zh) * 2013-03-25 2013-06-19 南京中电熊猫液晶显示科技有限公司 一种led背光模组
CN103256499A (zh) * 2013-01-10 2013-08-21 友达光电股份有限公司 照明装置
WO2014051099A1 (fr) * 2012-09-28 2014-04-03 シャープ株式会社 Dispositif d'affichage et dispositif d'affichage à cristaux liquides
WO2015016212A1 (fr) * 2013-07-30 2015-02-05 シャープ株式会社 Dispositif d'affichage, dispositif de réception de télévision et boîtier
CN108278553A (zh) * 2018-03-22 2018-07-13 泉州市中研智能机电研究院有限公司 一种笔记本电脑的专用led照明装置
JP2020126811A (ja) * 2019-02-06 2020-08-20 株式会社ジャパンディスプレイ 照明装置および表示装置

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JP2008053198A (ja) * 2006-07-28 2008-03-06 Fujifilm Corp 面状照明装置
JP2008262766A (ja) * 2007-04-11 2008-10-30 Sharp Corp 導光板、面光源装置及び液晶表示装置
JP2009098310A (ja) * 2007-10-15 2009-05-07 Hitachi Displays Ltd 液晶表示装置

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Publication number Priority date Publication date Assignee Title
JP2008053198A (ja) * 2006-07-28 2008-03-06 Fujifilm Corp 面状照明装置
JP2008262766A (ja) * 2007-04-11 2008-10-30 Sharp Corp 導光板、面光源装置及び液晶表示装置
JP2009098310A (ja) * 2007-10-15 2009-05-07 Hitachi Displays Ltd 液晶表示装置

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104685555A (zh) * 2012-09-28 2015-06-03 夏普株式会社 显示装置、液晶显示装置
WO2014051099A1 (fr) * 2012-09-28 2014-04-03 シャープ株式会社 Dispositif d'affichage et dispositif d'affichage à cristaux liquides
JP2014082202A (ja) * 2012-09-28 2014-05-08 Sharp Corp 表示装置、液晶表示装置
CN103256499A (zh) * 2013-01-10 2013-08-21 友达光电股份有限公司 照明装置
CN103256499B (zh) * 2013-01-10 2015-02-18 友达光电股份有限公司 照明装置
CN103115265B (zh) * 2013-01-29 2014-11-05 余姚付世光电科技有限公司 全反射led面板灯
CN103115265A (zh) * 2013-01-29 2013-05-22 余姚付世光电科技有限公司 全反射led面板灯
CN103162193A (zh) * 2013-03-25 2013-06-19 南京中电熊猫液晶显示科技有限公司 一种led背光模组
WO2015016212A1 (fr) * 2013-07-30 2015-02-05 シャープ株式会社 Dispositif d'affichage, dispositif de réception de télévision et boîtier
JP2015028557A (ja) * 2013-07-30 2015-02-12 シャープ株式会社 表示装置、及びテレビ受信装置
CN108278553A (zh) * 2018-03-22 2018-07-13 泉州市中研智能机电研究院有限公司 一种笔记本电脑的专用led照明装置
JP2020126811A (ja) * 2019-02-06 2020-08-20 株式会社ジャパンディスプレイ 照明装置および表示装置
JP7250549B2 (ja) 2019-02-06 2023-04-03 株式会社ジャパンディスプレイ 照明装置および表示装置

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