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WO2012081569A1 - Élément émetteur de lumière, élément de réglage de lumière, dispositif d'affichage et dispositif d'éclairage - Google Patents

Élément émetteur de lumière, élément de réglage de lumière, dispositif d'affichage et dispositif d'éclairage Download PDF

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Publication number
WO2012081569A1
WO2012081569A1 PCT/JP2011/078765 JP2011078765W WO2012081569A1 WO 2012081569 A1 WO2012081569 A1 WO 2012081569A1 JP 2011078765 W JP2011078765 W JP 2011078765W WO 2012081569 A1 WO2012081569 A1 WO 2012081569A1
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WIPO (PCT)
Prior art keywords
light
emitting element
light emitting
concave mirror
emitted
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2011/078765
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English (en)
Japanese (ja)
Inventor
梅中　靖之
豪 鎌田
柴田　諭
昇平 勝田
大祐 篠崎
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Sharp Corp
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Sharp Corp
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Filing date
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Publication of WO2012081569A1 publication Critical patent/WO2012081569A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/006—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to produce indicia, symbols, texts or the like
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/855—Optical field-shaping means, e.g. lenses

Definitions

  • the present invention relates to a light emitting element, a light control element, a display device, and a lighting device.
  • This application claims priority based on Japanese Patent Application No. 2010-280263 filed in Japan on December 16, 2010, the contents of which are incorporated herein by reference.
  • a light emitting element having a light source such as a light emitting diode (hereinafter abbreviated as LED) is known.
  • a light-emitting element having a configuration of a reflective light-emitting diode that includes a light source mounted on a substrate and has a reflective surface that reflects light emitted from the light source and reflects it to the outside is disclosed. (See Patent Document 1 below). This light emitting element extracts light from the normal direction of the LED mounting substrate.
  • a light emitting element having a light source mounted on a substrate and an orientation control member having a plurality of incident surfaces and reflecting surfaces is disclosed (the following patent document) 2). This light emitting element extracts light from a direction different from the normal direction of the LED mounting substrate.
  • Patent Document 1 can extract light having directivity, it cannot extract light obliquely with respect to the normal line of the LED mounting substrate.
  • a light emitting element is attached to one surface of an object (for example, a surface to which the light emitting element is attached, such as an end face of a light guide plate)
  • light cannot be extracted in an oblique direction with respect to the normal of the one surface of the object.
  • the technique of Patent Document 2 cannot extract light having directivity. Therefore, the light-emitting element can be applied to an application such as a lighting device that hardly requires light having high directivity, but cannot be applied to a device that requires light having high directivity.
  • An aspect of the present invention is made to solve the above-described problem, and provides a light-emitting element capable of extracting light with high directivity in an oblique direction with respect to a normal line of one surface of an object.
  • Another object is to provide a light control element that can obtain a sufficient amount of light by using the light emitting element.
  • Another object is to provide a display device that can display brightly and with high contrast by using the above light control element.
  • a light-emitting element includes a mounting surface for mounting on a light guide, and the light-emitting element includes a package in which a recess is formed, and the recess in the package. And a light source disposed at the focal point of the concave mirror, and a straight line connecting the central point of the concave mirror and the focal point obliquely intersects the normal of the mounting surface Yes.
  • the straight line may coincide with a normal line of a light emission surface of the light source.
  • the concave mirror may be a parabolic mirror, and the straight line may coincide with a rotational symmetry axis of the parabolic mirror.
  • the light-emitting element further includes a reflection mirror, and the reflection mirror is disposed such that the light source is disposed between the concave mirror and the reflection mirror, and the reflection mirror is the concave surface. Light from the light source emitted in a direction different from the mirror may be reflected toward the concave mirror.
  • the light-emitting element further includes a light transmissive member that transmits light emitted from the light source, and the light source is embedded in the concave portion of the package by the light transmissive member,
  • the light transmission member may form the mounting surface.
  • the light-emitting element according to one embodiment of the present invention may further include a lid member, the lid member may form the attachment surface, and the lid member may be disposed so as to close the recess.
  • the light source may be attached to the back surface of the lid member.
  • the light control device includes an illumination unit capable of controlling the amount of emitted light, and a light guide that receives the light emitted from the illumination unit and propagates the light while totally reflecting the light inside.
  • the light guide has a plurality of light extraction regions for extracting the light to the outside while the light emitted from the illumination unit is propagated while being totally reflected inside the light guide, At least two light extraction regions of the plurality of light extraction regions have different incident angle ranges in which light emitted from the illumination unit can be extracted to the outside, and the light guide is emitted from the illumination unit
  • the light is configured to propagate inside the light guide at a plurality of different propagation angles
  • the illumination unit includes a light emitting element having an attachment surface for attaching to the light guide, and the light emitting element includes a recess.
  • a package formed with the package A concave mirror provided in the concave portion and a light source disposed at the focal point of the concave mirror, and a straight line connecting the center point of the concave mirror and the focal point obliquely intersects with the normal of the mounting surface is doing.
  • the end surface of the light guide is orthogonal to the surface on which the light extraction region is provided, and the light emitting device is disposed on the end surface of the light guide.
  • a plurality of light emitting elements are arranged, and each of the plurality of light emitting elements has the straight line in a different direction with respect to the light extraction region so that the emitted light is incident on the light extraction region at different incident angles. It may be arranged so that.
  • a display device includes the above-described dimming element and a display element that performs display using light emitted from the dimming element.
  • a lighting device includes the above-described dimming element.
  • a light emitting element capable of extracting light with high directivity in an oblique direction with respect to the normal line of one surface of an object.
  • a light control element that can obtain a sufficient amount of light by using the light emitting element.
  • a bright display device with high contrast can be realized by using the dimmer element.
  • FIG. 13B is a cross-sectional view taken along the line A-A ′ of FIG. 13A showing an example of a lighting device.
  • FIG. 1 is a perspective view showing a liquid crystal display device and a backlight according to the present embodiment.
  • 2A to 2C are diagrams for explaining the principle of light emitted from each light extraction region in the backlight according to the present embodiment.
  • FIG. 2A shows a case where light is emitted from the first light extraction area RA.
  • FIG. 2B shows a case where light is emitted from the second light extraction region RB.
  • FIG. 2C shows a case where light is emitted from the third light extraction region RC.
  • FIG 3 is a cross-sectional view showing the light emitting device of this embodiment.
  • 4A to 4C are cross-sectional views showing the light-emitting elements of this embodiment.
  • FIGS. 5A to 5C are simulation results showing the relationship between the angle and the amount of emitted light in each light-emitting element of this embodiment.
  • the scale of the size may be varied depending on the component.
  • the liquid crystal display device 1 (display device) of the present embodiment includes a liquid crystal panel 2 (display element), a backlight 3 (light control element) disposed on the back side of the liquid crystal panel 2, have.
  • the liquid crystal panel 2 is a transmissive liquid crystal panel that performs display using light emitted from the backlight 3. The user can view the display from the opposite side of the backlight 3, that is, from the upper side of the liquid crystal panel 2 in FIG.
  • the configuration of the liquid crystal panel 2 is not particularly limited, and may be an active matrix liquid crystal panel including a switching thin film transistor (hereinafter abbreviated as TFT) for each pixel.
  • TFT switching thin film transistor
  • a simple matrix type liquid crystal panel that does not include a TFT may be used.
  • the liquid crystal panel is not limited to a transmissive liquid crystal panel, and may be a transflective liquid crystal panel.
  • the display mode is not particularly limited, and there are various display modes such as VA (Vertical Alignment) mode, TN (Twisted Nematic) mode, STN (Super Twisted Nematic) mode, IPS (In-Plane Switching) mode, etc.
  • VA Vertical Alignment
  • TN Transmission Nematic
  • STN Super Twisted Nematic
  • IPS In-Plane Switching
  • the backlight 3 of the present embodiment does not emit light uniformly from the entire surface of the light guide, which will be described later, but emits light for each light extraction region in which the entire surface is divided into a plurality (9 in this embodiment).
  • the amount of light emitted can be controlled. That is, in the backlight 3 of the present embodiment, each of the plurality of light extraction regions has a dimming function. As a whole of the backlight 3, it is possible to emit light only in a specific light extraction region or not. Alternatively, the amount of light emitted from a specific light extraction region can be changed with respect to the amount of light emitted from another light extraction region.
  • the backlight 3 includes light emitting elements 7a, 7b, and 7c.
  • light emitting elements 7a, 7b, and 7c are light emitting elements 7a, 7b, and 7c.
  • FIG. 3 is a cross-sectional view showing the light emitting element.
  • FIG. 3 shows a basic configuration (light emitting element 7) of three light emitting elements 7a, 7b, 7c provided on the first end face 5c.
  • the light emitting element 7 includes a package 71, a concave mirror 72, a light source 73, a reflection mirror 74, and a light transmission member 75, as shown in FIG.
  • the concave mirror 72 is provided in the concave portion 71 a of the package 71.
  • the shape of the concave mirror 72 is a curved shape that follows the shape of the concave portion 71 a of the package 71.
  • the concave mirror 72 is a parabolic mirror that reflects the light emitted from the light source 73.
  • the light source 73 is embedded in the recess 71 a of the package 71 by a light transmitting member 75 that transmits light emitted from the light source 73.
  • symbol Pf is the focal point of the concave mirror 72
  • symbol Pc is the central point of the concave mirror 72
  • symbol CL1 is the central axis of the concave mirror 72 (the central point Pc of the concave mirror 72 and the focal point Pf of the concave mirror 72).
  • the line CL) is a normal line of the mounting surface 71 b
  • the sign ⁇ is an inclination angle of the concave mirror 72.
  • the inclination angle of the concave mirror 72 is an angle formed by the central axis of the concave mirror 72 and the normal line of the mounting surface 71b.
  • a recess 71 a is formed in the package 71.
  • the package 71 has a rectangular parallelepiped shape, and has a mounting surface 71b on the side from which light is emitted (at the end of the portion where the recess 71a is formed).
  • the attachment surface 71 b is a flat surface that serves as an attachment surface when the light emitting element 7 is attached to the first end surface 5 c of the light guide 5.
  • the shape of the concave portion 71a of the package 71 is a curved shape that is concave with respect to the light source 73 when viewed from the normal surface of the virtual surface including the central axis CL1 of the concave mirror 72 and the normal line CL2 of the mounting surface 71b. Yes. That is, the slope of the tangent line of the curve gradually becomes gentler as it approaches the center point of the recess 71a.
  • the shape of the recess 71a of the package 71 is formed by a method such as resin injection molding using a mold having a convex shape obtained by inverting the shape of the recess 71a. Or you may form the shape of the recessed part 71a of the package 71 by cutting the surface of the originally flat resin member, for example.
  • the central axis CL1 of the concave mirror 72 obliquely intersects the normal line CL2 of the mounting surface 71b with a predetermined angle (inclination angle) ⁇ . Further, the central axis CL1 of the concave mirror 72 coincides with the rotation target axis of the parabolic mirror.
  • the size of the parabolic mirror (the diameter of a circle viewed from a direction parallel to the central axis CL1) is set to a diameter of 8 mm.
  • the radius of curvature of the parabolic mirror is set to 5.4 mm.
  • the concave mirror 72 is a parabolic mirror
  • it is not limited to this, and may be a spherical mirror, for example.
  • the concave mirror 72 is not limited to a circular rotationally symmetric shape as viewed from a direction parallel to the central axis CL1 of the concave mirror 72, and is parallel to the central axis CL1 of the concave mirror 72 such as an elliptical mirror. It is also possible to select a non-rotationally symmetric shape that is non-circular when viewed from the direction.
  • the light source 73 is a substantially rectangular parallelepiped chip LED (surface mounting LED).
  • the central axis CL1 of the concave mirror 72 coincides with the normal line of the light emission surface of the light source 73 (the normal line of the upper surface of the chip LED).
  • a reflection mirror 74 is provided on the side of the light source 73 opposite to the side where the concave mirror 72 is disposed. That is, the light source 73 is disposed between the concave mirror 72 and the reflection mirror 74.
  • the reflection mirror 74 can be formed on the mounting substrate of the light source 73 by, for example, forming a metal film such as aluminum by sputtering or vapor deposition.
  • the reflection mirror 74 reflects light from the light source 73 emitted in a different direction from the concave mirror 72 toward the concave mirror 72.
  • the size of the chip LED one side of a square viewed from a direction parallel to the central axis CL1
  • the size of the reflecting mirror is set to 1 mm.
  • a part of the reflection mirror 74 is provided with a printed wiring board on which the light source 73 is mounted.
  • a portion corresponding to the back surface of the light source 73 can be a mounting region, and the other portion (a peripheral portion of the mounting region) can be a reflection region.
  • Various wirings formed in the mounting region of the reflection mirror 74 include a printed wiring board on which the light emitting elements 7a, 7b, and 7c described above are mounted, and a control including a driving IC that is responsible for driving and controlling the light emitting elements 7a, 7b, and 7c. It is electrically connected to the part.
  • the light source 73 is embedded in the recess 71 a of the package 71 with a light transmitting member 75.
  • the light transmissive member 75 can be formed by the following method.
  • a concave mirror 72 is disposed in the recess 71 a of the package 71, and a light source 73 and a reflection mirror 74 are disposed inside the package 71.
  • a resin having optical transparency such as an acrylic resin is injected into the package 71 and cured.
  • the refractive index of the light transmitting member 75 is set to 1.5, which is the same value as the refractive index nWG (1.5) of the light guide 5.
  • the transmittance can be set to a value different from the refractive index nWG (1.5) of the light guide 5.
  • the transmittance of the light transmissive member 75 can be changed by selecting a material having a different refractive index when the light transmissive member 75 is formed, or by adding a low refractive index material to the resin material. This can be done by changing the concentration of the low refractive index material.
  • the backlight 3 is composed of three backlight units 4 having substantially the same dimensions, shape, and configuration.
  • the three backlight units 4 are in a direction orthogonal to the longitudinal direction of the light guide 5 described later, that is, a direction orthogonal to the direction in which the three light extraction regions RA, RB, RC of the light guide 5 are arranged (FIG. 1). In the y-axis direction). Therefore, the backlight 3 has a total of nine light extraction regions RA, RB, RC, three in each of the horizontal and vertical directions on the screen of the liquid crystal display device 1.
  • Each backlight unit 4 includes an illumination unit 6 and a light guide 5.
  • the illumination unit 6 includes a plurality (three in the present embodiment) of light emitting elements 7a, 7b, and 7c.
  • the light guide 5 is composed of a parallel plate made of a resin having optical transparency such as acrylic resin.
  • the backlight 3 shows the example comprised from the three backlight units 4 by which the light guide was made into the different body here, it has a total of nine light extraction area
  • the light guide may have an integral structure. Even with this structure, it is possible to select the light extraction regions RA, RB, and RC for emitting light by using a light emitting element with high directivity.
  • Three light emitting elements 7a, 7b, 7c are installed on one end face of the light guide 5 with the light emission side facing the light guide 5 side.
  • the light guide 5 receives light emitted from the light emitting elements 7a, 7b, and 7c.
  • the light guide 5 reflects the incident light from the inside to the opposite end surface (from the ⁇ x direction to the + x direction in FIG. 1) from the end surface side where the light emitting elements 7a, 7b, 7c are installed. It has the function of propagating and taking it out to the outside space.
  • the three light emitting elements 7a, 7b, and 7c can be individually controlled to be turned on / off, and the amount of emitted light can be controlled.
  • the backlight 3 includes a printed wiring board on which the light emitting elements 7a, 7b, and 7c are mounted, and a driving IC that is responsible for driving and controlling the light emitting elements 7a, 7b, and 7c.
  • a control unit and the like are provided.
  • the light emitting elements 7a, 7b, and 7c light emitting elements having a half value width of about 5 ° with respect to the spread angle of the emitted light while the light is guided through the light guide 5 can be used.
  • each light extraction region RA, RB, RC low refractive index bodies 8a, 8b, a refractive index body 9, and a light scattering body 10 are stacked in this order.
  • the low refractive index bodies 8 a and 8 b have a refractive index lower than that of the light guide 5.
  • the refractive index body 9 has a refractive index equal to the refractive index of the light guide 5.
  • the light scatterer 10 scatters the light emitted from the low refractive index bodies 8 a and 8 b and the refractive index body 9.
  • the respective light extraction regions are directed from the side closer to the light emitting elements 7a, 7b, 7c to the side farther from the first light extraction region RA, the second light extraction region RB, and the third light extraction. This is referred to as region RC.
  • the main surface of the light guide 5 provided with the light extraction regions RA, RB, RC is the first main surface 5a
  • the main surface opposite to the first main surface 5a is the second main surface 5b
  • the light emitting element 7a is the first end surface 5c
  • the end surface of the light guide 5 provided with 7b and 7c is referred to as a first end surface 5c
  • the end surface opposite to the first end surface 5c is referred to as a second end surface 5d.
  • the low refractive index bodies 8 a and 8 b both have a refractive index lower than that of the light guide 5, and the refractive index body 9 has a refractive index equal to the refractive index of the light guide 5.
  • the low refractive index bodies 8a and 8b and the refractive index body 9 have different refractive indexes.
  • the low refractive index bodies 8a and 8b and the refractive index body 9 are arranged along the propagation direction of light emitted from the light emitting elements 7a, 7b and 7c and incident on the light extraction regions RA, RB and RC (FIG.
  • the refractive index is relatively low, and the refractive index is relatively high.
  • the refractive index nWG of the light guide 5 is 1.5
  • the refractive index nA of the first low refractive index body 8a provided in the first light extraction region RA is 1.3
  • the refractive index nB of the second low refractive index body 8b provided in the second light extraction region RB is 1.4
  • the refractive index nC of the refractive index body 9 provided in the third light extraction region RC is 1.5. Is set.
  • the first method is to form the low refractive index bodies 8a and 8b and the refractive index body 9 using different materials.
  • an acrylic resin is used as the material of the light guide 5
  • Kuraray Co., Ltd. the material of the refractive index body 9.
  • the light scatterer 10 may be merely disposed on the light guide 5.
  • the second technique is to use a material containing a low refractive index material in a predetermined substrate and adjust the refractive index by varying the concentration of the low refractive index material.
  • Low refractive index materials such as powder (registered trademark, refractive index: 1.27) or airgel (registered trademark, refractive index: 1.27) manufactured by Jason Wells are included, and the concentration of these low refractive index materials is different.
  • Two types of liquids are prepared. Each liquid material can be selectively applied on the light guide 5 and cured.
  • a light scatterer 10 is laminated on the low refractive index bodies 8 a and 8 b and the refractive index body 9.
  • the light scatterer 10 has a function of scattering the light incident from the low refractive index bodies 8 a and 8 b and the refractive index body 9 and extracting the light to the external space of the backlight 3.
  • the light scatterer 10 a commercially available light scattering film in which scattering beads or the like are coated on a base film can be used.
  • the light scattering body 10 can be formed by sticking a light scattering film on the low refractive index bodies 8 a and 8 b and the refractive index body 9.
  • the first end surface 5 c of the light guide 5 is a right-angle surface having the same angle with respect to the first main surface 5 a.
  • Light emitting elements 7a, 7b, 7c are fixed to the first end surface 5c of the light guide 5 via an optical adhesive. Therefore, three light emitting elements 7 a, 7 b, 7 c are arranged in the short direction of the light guide 5 over the entire first end face 5 c.
  • the concave mirror 72 With such a configuration, most of the light emitted from the light source 73 is directly incident on the concave mirror 72.
  • light from the light source 73 emitted in a different direction from the remaining concave mirror 72 is reflected by the reflection mirror 74 and enters the concave mirror 72.
  • the light incident on the concave mirror 72 is reflected by the concave mirror 72 toward the mounting surface 71b. Since the light source 73 is disposed at the focal point Pc of the concave mirror 72, the light reflected by the concave mirror 72 is collimated.
  • the light collimated by the concave mirror 72 propagates through the light transmitting member 75 and is extracted from the mounting surface 71b.
  • the light emission surface of the light transmitting member 75 is the mounting surface.
  • the angle formed by the central axis CL1 of the concave mirror 72 and the normal line CL2 of the mounting surface 71b is the largest.
  • FIG. 2A is a sectional view taken along the line A-A ′ of FIG.
  • FIG. 2B shows a cross-sectional view along the line B-B ′ of FIG. 1.
  • FIG. 2C shows a cross-sectional view taken along the line C-C 'of FIG.
  • Each light emitting element 7a, 7b, 7c is fixed so that the light La, Lb, Lc is incident on the first end face 5c obliquely.
  • the light La, Lb, Lc emitted from each light emitting element 7a, 7b, 7c repeats total reflection between the first main surface 5a and the second main surface 5b of the light guide 5, and the first end surface 5c. Is propagated from the side toward the second end face 5d.
  • an angle formed by the optical axis with respect to a virtual horizontal plane passing through the center in the thickness direction of the light guide plate is defined as a propagation angle ⁇ .
  • the refractive index of the light transmission member 75 is set to 1.5, which is the same value as the refractive index nWG (1.5) of the light guide 5, the propagation angle ⁇ is equal to the inclination angle ⁇ . Therefore, as shown in FIG. 2A, the propagation angle phi A of the light La from the first light emitting element 7a becomes 37 °. As shown in Figure 2B, propagation angle phi B light Lb from the second light emitting element 7b becomes 26 °. As shown in FIG.
  • propagation angle phi C of the light Lc from the third light-emitting element 7c becomes 15 °. Therefore, while each light La, Lb, Lc is propagated from the first end face 5c side toward the second end face 5d side, the first light extraction area RA, the second light extraction area RB, and the third light extraction area RC. In this order, the light enters the light extraction areas RA, RB, RC.
  • the thickness (dimension in the z-axis direction) is drawn sufficiently larger than the longitudinal dimension (dimension in the x-axis direction) of the light guide 5 for easy viewing. Further, only the central axis of the light emitted from each light emitting element 7a, 7b, 7c is drawn. For this reason, it may seem that the light does not necessarily enter each of the light extraction regions RA, RB, RC, but actually the thickness is sufficiently small with respect to the longitudinal dimension of the light guide 5 and each light emitting element 7a. , 7b, 7c have a finite beam diameter, so that the light La, Lb, Lc is reliably incident on each of the light extraction areas RA, RB, RC.
  • the illuminating unit 6 of the present embodiment includes three light emitting elements 7a, 7b, and 7c.
  • Lights La, Lb, and Lc from the light emitting elements 7a, 7b, and 7c are converted into the light extraction regions RA,
  • Lights La, Lb, and Lc are extracted from RB and RC and are incident on the light extraction regions RA, RB, and RC at an incident angle including an incident angle at which the light can be extracted.
  • C 15 °).
  • the light La, Lb, and Lc from each light emitting element 7a, 7b, and 7c are the light guide 5 in each light extraction area
  • region RA, RB, RC, each low refractive index body 8a, 8b, and the refractive index body 9 Consider the critical angle when entering the interface.
  • the incident angle range in which light can be extracted outside in the first light extraction area RA is 60. Less than 1 °, the incident angle range in which light can be extracted outside in the second light extraction region RB is less than 69.0 °, and the incident angle range in which light can be extracted outside in the third light extraction region RC is all angles. It becomes a range.
  • the two low refractive index bodies 8a and 8b and the refractive index body 9 provided in the three light extraction regions RA, RB, and RC of the present embodiment are incident on the light extraction regions RA, RB, and RC.
  • the light is arranged in the order of relatively low refractive index to relatively high refractive index.
  • the three light extraction regions RA, RB, and RC have different incident angle ranges in which light can be extracted to the outside.
  • the three light extraction areas RA, RB, and RC have a relatively narrow incident angle range that can be extracted from a light extraction area that has a relatively narrow incident angle range along the propagation direction of incident light.
  • the incident angle range that can be extracted in the first light extraction region RA is less than 60.1 °
  • the incident angle range that can be extracted in the second light extraction region RB is less than 69.0 °
  • the incident angle range that can be extracted in the third light extraction region RC is the entire angle range.
  • the incident angle ⁇ A of the light La from the first light emitting element 7a with respect to the first major surface 5a is 53 °.
  • the incident angle ⁇ A with respect to the first major surface 5a is no matter how many times the light La from the first light emitting element 7a repeats total reflection. Always 53 °.
  • the critical angle ⁇ A 60.1 °
  • the light Lb cannot be transmitted through the interface between the light guide 5 and the first low refractive index body 8a, and is totally reflected.
  • the critical angle ⁇ B here is 69.0 °
  • the light Lb passes through the interface between the light guide 5 and the second low refractive index body 8b and is incident on the second low refractive index body 8b. , Extracted from the light scatterer 10 to the outside. In this way, substantially the entire amount of the light Lb emitted from the second light emitting element 7b can be extracted from the second light extraction region RB.
  • the backlight 3 of the present embodiment can extract light emitted from a predetermined LED only from a predetermined light extraction area.
  • the light Lc from the third light emitting element 7c is the first light Lc.
  • the light Lc from the third light emitting element 7c reaches the first light extraction region RA or the second light extraction region RB, and the interface between the light guide 5 and the first low refractive index body 8a or the second low refractive index body 8b.
  • incident angle ⁇ C 75 °
  • the incident angle ⁇ C is larger than the critical angle ⁇ A and the critical angle ⁇ B , so that the light Lc cannot be transmitted through each interface and is totally reflected.
  • the light Lc from the third light emitting element 7c reaches the third light extraction region RC, the light Lc passes through the interface between the light guide 5 and the refractive index body 9 and is incident on the refractive index body 9, and thereafter , Extracted from the light scatterer 10 to the outside. In this way, substantially the entire amount of the light Lc emitted from the third light emitting element 7c can be extracted from the third light extraction region RC.
  • the three light extraction areas RA are determined depending on which of the three light emitting elements 7a, 7b, and 7c of the backlight unit 4 is lit. , RB, and RC, the light extraction area from which light is extracted, that is, which light extraction area RA, RB, RC is allowed to emit light can be appropriately selected. Further, by controlling the amount of light emitted from each light emitting element 7a, 7b, 7c, the amount of light extracted from the selected light extraction regions RA, RB, RC, that is, the brightness of the selected light extraction region. Can be adjusted.
  • the light emitting element 7a of the present embodiment since the light source 73 is disposed at the focal point Pf of the concave mirror 72, the light emitted from the light source 73 and reflected by the concave mirror 72 is collimated. The light collimated by the concave mirror 72 is emitted from the mounting surface 71 b of the package 71. Therefore, light with high directivity can be extracted from the mounting surface 71 b of the package 71.
  • the light cannot be extracted in an oblique direction with respect to the normal line of the LED mounting substrate.
  • a light-emitting element is attached to one surface of an object (for example, a surface on which a light-emitting element is attached, such as an end face of a light guide plate)
  • light cannot be extracted in an oblique direction with respect to the normal of the one surface of the object .
  • the light emitting element 7a of the present embodiment since the central axis CL1 of the concave mirror 72 obliquely intersects the normal line CL2 of the mounting surface 71b of the package 71, the light is normal to one surface of the object.
  • the light emitting element 7a of the present embodiment can be taken out obliquely. Therefore, according to the light emitting element 7a of the present embodiment, light with high directivity can be extracted in an oblique direction with respect to the normal line of one surface of the object. In addition, in order to extract light in an oblique direction with respect to the normal of one surface of the object, it is not necessary to cut one surface of the object obliquely. Therefore, the shape of the object becomes simple, and processing is not time-consuming.
  • the central axis CL1 of the concave mirror 72 coincides with the normal line of the light exit surface of the light source 73. Therefore, the light emitted from the light source 73 can be extracted more efficiently than when the central axis CL1 of the concave mirror 72 is deviated from the normal line of the light emission surface of the light source 73.
  • the concave mirror 72 is a parabolic mirror and the light source 73 is disposed at the focal point Pf of the concave mirror 72, the light emitted from the light source 73 can be sufficiently collimated and extracted. Therefore, it becomes easy to extract light with high directivity.
  • a reflection mirror 74 is provided on the side opposite to the side where the concave mirror 72 of the light source 73 is disposed. Therefore, light reflected from the side opposite to the side where the concave mirror 72 of the light source 73 is disposed (light from the light source 73 not directly incident on the concave mirror 72) is reflected toward the concave mirror 72 by the reflection mirror 74.
  • the reflection mirror 74 is not provided, the light emitted from the side opposite to the side where the concave mirror 72 of the light source 73 is disposed is not reflected by the concave mirror 72, and the package 71 The light that has not been collimated is extracted as it is from the mounting surface 71b. Therefore, by providing the reflecting mirror 74, light with high directivity can be reliably extracted.
  • the position and posture of the light source 73 can be stably held. For example, when the light emitting element 7a receives an impact from the outside, the position of the light source 73 is shifted or the posture of the light source 73 is inclined (the light source 73 is shifted from the focal point Pf, or the normal line of the light emission surface of the light source 73). Can be prevented from deviating from the central axis CL1 of the concave mirror 72).
  • the configuration in which the reflection mirror 74 is provided on the side opposite to the side where the concave mirror 72 of the light source 73 is disposed is described as an example.
  • the configuration is not limited thereto.
  • the light from the light source emitted in a direction different from the concave mirror is directed in the same direction as the traveling direction of the light collimated by the concave mirror.
  • a collimating lens may be provided.
  • the light emitted from the side opposite to the side where the concave mirror of the light source is disposed (the light from the light source not directly incident on the concave mirror) is collimated by the collimating lens, and the mounting surface of the package
  • the collimated light is extracted from. Therefore, by providing a collimating lens instead of the reflecting mirror, light with high directivity can be reliably extracted.
  • FIGS. 4A to 5C are cross-sectional views showing the light-emitting elements of this embodiment.
  • FIG. 4A is a cross-sectional view showing the first light emitting element 7a.
  • FIG. 4B is a cross-sectional view showing the second light emitting element 7b.
  • FIG. 4C is a cross-sectional view showing the third light emitting element 7c.
  • FIGS. 4A to 4C are cross-sectional views showing the light-emitting elements of this embodiment.
  • FIG. 4A is a cross-sectional view showing the first light emitting element 7a.
  • FIG. 4B is a cross-sectional view showing the second light emitting element 7b.
  • FIG. 4C is a cross-sectional view showing the third light emitting element 7c.
  • FIGS. 5A to 5C are simulation results showing the relationship between the angle and the amount of emitted light in each light-emitting element of this embodiment.
  • FIG. 5A is a graph showing how light is extracted in the first light emitting element 7a with an inclination angle.
  • FIG. 5B is a graph showing a state of light extraction in the second light emitting element 7b.
  • FIG. 5C is a graph showing a state of light extraction in the third light emitting element 7c.
  • 5A to 5C is an angle (inclination angle) ⁇ [°] formed by the central axis of the concave mirror and the normal of the mounting surface.
  • the vertical axis of the graphs in FIGS. 5A to 5C represents the amount of luminous flux [lumen].
  • the basic configuration is the same as that of the light emitting device of the present embodiment, and the light source and the reflection mirror are embedded in the concave portion of the package with resin (light transmitting member).
  • the simulation conditions were as follows: in each light emitting element 7a, 7b, 7c, the size of the parabolic mirror (diameter of the circle viewed from the direction parallel to the central axis CL1) was 8 mm in diameter, and the size of the reflecting mirror (parallel to the central axis CL1).
  • the side of the square viewed from one direction) is 1 mm
  • the size of the chip LED one side of the square viewed from the direction parallel to the central axis CL1
  • the radius of curvature of the parabolic mirror is 5.4 mm
  • the embedded resin The refractive index was 1.5.
  • emitted toward the light guide 5 was calculated
  • the maximum amount of light flux emitted from the first light emitting element 7a was obtained at an inclination angle of 36.898 °. Further, the full width at half maximum (FWHM) of the intensity distribution of light emitted from the first light emitting element 7a was 3.2 °.
  • the maximum amount of light flux emitted from the second light emitting element 7b was obtained at an inclination angle of 25.928 °.
  • the half width (FWHM) of the intensity distribution of the light emitted from the second light emitting element 7b was 3.2 °.
  • the maximum amount of emitted light flux in the third light emitting element 7c was obtained at an inclination angle of 14.958 °. Further, the full width at half maximum (FWHM) of the intensity distribution of the light emitted from the third light emitting element 7c was 3.2 °.
  • FIG. 6 is a cross-sectional view showing the light emitting device of this embodiment.
  • the same components as those in FIG. 3 used in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
  • the light source 73 and the reflection mirror 74 are embedded in the recess 71 a of the package 71 by the light transmission member 75, and the light emission surface of the light transmission member 75 is attached to the first end surface 5 c of the light guide 5. It was a surface.
  • the light emitting element 107 of the present embodiment as shown in FIG. 6, the light source 73 and the reflection mirror 74 are attached to the back surface 76 a of the lid member 76, and the lid member 76 is partly provided on the recess 71 a of the package 71. Is fitted, and the light emission surface (front surface) 76b of the lid member 76 is an attachment surface.
  • the lid member 76 is a member for closing the recess 71 a of the package 71.
  • the light emission surface 76b of the lid member 76 is a flat surface parallel to the mounting surface 71b of the package 71 described above.
  • the back surface 76a of the lid member 76 is a flat surface with the central axis CL1 of the concave mirror 72 as a normal line.
  • the shape of the lid member 76 is formed by a method such as injection molding of resin using a mold having a predetermined shape. Alternatively, the shape of the lid member 76 may be formed, for example, by cutting the surface of an originally flat resin member.
  • the recess 71a of the package 71 closed by the lid member 76 has a so-called hollow structure in which an air layer 175 is enclosed.
  • the concave portion 71a of the package 71 can be a hollow structure, and a light transmitting member can be arranged in the same manner as in the configuration of the first embodiment.
  • the light transmissive member is formed by disposing a concave mirror 72 in the concave portion 71a of the package 71, and injecting and curing a light transmissive resin such as an acrylic resin into the package 71, for example. can do.
  • a light transmissive resin such as an acrylic resin
  • the transmittance of the light transmitting member can be a value different from the refractive index nWG (1.5) of the light guide 5.
  • the liquid material can be taken in and out of the package 71 only by removing the lid member 76 by making the light transmitting member a liquid material. It becomes easy to change the transmittance of the transmissive member.
  • the lid member 76 is provided, it is possible to prevent impurities from entering the package 71 from the outside.
  • FIGS. 7, 8A and 8B a third embodiment of the present invention will be described with reference to FIGS. 7, 8A and 8B.
  • the basic configuration of the light emitting device of this embodiment is the same as that of the first embodiment, and only the shape of the concave portion of the package and the shape of the concave mirror are different from those of the first embodiment. Therefore, in this embodiment, description of the basic structure of a light emitting element is abbreviate
  • FIG. 7 is a perspective view showing the light emitting device of this embodiment.
  • 8A and 8B are schematic views showing the light emitting device of this embodiment.
  • FIG. 8A is a cross-sectional view of the light-emitting element.
  • FIG. 8B is a plan view of the light emitting element. 7, 8 ⁇ / b> A, and 8 ⁇ / b> B, the same components as those in FIG. 3 used in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
  • the shape of the recess 71 a of the package 71 is concave with respect to the light source 73 as viewed from the normal of the virtual plane including the central axis CL 1 of the concave mirror 72 and the normal CL 2 of the mounting surface 71 b. It was like a curve.
  • the concave mirror 72 is a parabolic mirror, and the shape viewed from a direction parallel to the central axis CL1 of the concave mirror 72 is a circular rotationally symmetric shape.
  • the concave portion 271a of the package 271 has a curved shape that is concave with respect to the light source 73.
  • the shape when the concave portion 271a is cut by a virtual plane including the central axis CL1 of the concave mirror 272 and the normal line CL2 of the mounting surface 271b is the same. Further, the shape viewed from the direction parallel to the central axis CL1 of the concave mirror 272 is rectangular.
  • the reflected light from the concave mirror 272 has directivity on the virtual plane (XZ plane) as shown in FIG. 8A, and a plane (XY) orthogonal to the virtual plane as shown in FIG. 8B. In the plane). Therefore, it is possible to extract light having directivity in the vertical direction and spreading in the horizontal direction.
  • FIG. 9 is an exploded perspective view showing a schematic configuration of a liquid crystal display device which is a configuration example of the display device.
  • FIG. 10A, FIG. 10B, FIG. 11A, and FIG. 11B are diagrams showing examples of backlight arrangement in a liquid crystal display device.
  • the liquid crystal display device 121 of this configuration example includes a lower case 122, a reflecting plate 123, a backlight 3 (light control element), a diffusion plate 124, and a liquid crystal panel 2 (display element). And an upper case 125. That is, a laminated body of the reflecting plate 123, the backlight 3, the diffusion plate 124, and the liquid crystal panel 2 is accommodated in the lower case 122 and the upper case 125.
  • the reflector 123 on the opposite side of the backlight 3 from the liquid crystal panel 2
  • light leaking from the backlight 3 to the opposite side of the liquid crystal panel 2 can be reflected and contributed to display.
  • the diffusion plate 124 between the backlight 3 and the liquid crystal panel 2
  • luminance unevenness of the backlight 3 can be reduced.
  • the reflecting plate 123 and the diffusing plate 124 are not necessarily used.
  • FIG. 10A a configuration in which a plurality of backlights 3 are arranged in the screen of the liquid crystal display device 121 so that the light extraction areas RA, RB, RC are arranged in the vertical direction of the screen can be employed.
  • FIG. 10B a configuration in which a plurality of backlights 3 are arranged so that the light extraction areas RA, RB, RC are arranged in the horizontal direction of the screen in the screen of the liquid crystal display device 127 is adopted. Can do.
  • the light extraction regions RA, RB, RC are provided only in a part in the longitudinal direction, and the other portions are elongated rod-shaped light guides 135 that are regions where light is guided.
  • a backlight 137 that combines a plurality of (three in this example) may be used.
  • regions where the light extraction regions RA, RB, RC are provided are shifted in the longitudinal direction. Therefore, when a plurality of light guides 135 are combined, the light extraction regions RA, RB, and RC are arranged along the longitudinal direction of the light guide 135.
  • a plurality of backlights 137 may be arranged in the screen of the liquid crystal display device 131 so that the light extraction areas RA, RB, RC are arranged in the vertical direction of the screen.
  • a plurality of backlights 137 may be arranged in the screen of the liquid crystal display device 133 so that the light extraction areas RA, RB, RC are arranged in the horizontal direction of the screen.
  • FIG. 12 is a cross-sectional view of the lighting device as the first configuration example.
  • 13A and 13B are diagrams showing a lighting apparatus as a second configuration example.
  • FIG. 13A is a plan view of the lighting apparatus as a second configuration example, and
  • FIG. 13B is a line AA ′ in FIG. 13A. It is sectional drawing of the illuminating device which is the 2nd structural example which follows.
  • the first low refractive index body 8a having a refractive index of 1.3 is formed on the first main surface 5a side of the light guide 5 and the refractive index is on the second main surface 5b side.
  • a second low refractive index body 8b of 1.4 is formed.
  • a light scatterer 10 is stacked on the first low refractive index body 8a and the second low refractive index body 8b.
  • Other configurations are the same as those of the first embodiment.
  • only one first end face 5c is shown, but actually, another one first end face having a different angle with respect to the first main face 5a is formed in the depth direction of the paper.
  • the light emitting element only one light emitting element 7a is shown, but actually another one LED is installed in the depth direction of the drawing.
  • the light emitting element 201 emits light from the first main surface 5a side depending on which one of the two light emitting elements provided on the first end surface 5c of the light guide 5 is lit. It is possible to switch whether light is emitted from the two principal surfaces 5b side. Therefore, it is possible to realize an illumination device that can switch the light emitting surface.
  • a character portion 204 written “SHARP” is formed on one surface of the light guide 5.
  • a first low refractive index body 8a having a refractive index of 1.3 is formed on the first main surface 5a side of the light guide 5, and the character portion 204 is formed.
  • the first low refractive index body 8a is not formed in any other part.
  • a light scatterer 10 is stacked on the first low refractive index body 8a. That is, the character part 204 is a light extraction area in the above embodiment. Other configurations are the same as those of the first embodiment. Although only one first end face 5c is shown in FIG.
  • the lighting device 203 light is emitted from the character part 204 depending on which of the two light emitting elements provided on the first end surface 5 c of the light guide 5 is lit, or other than the character part 204. It is possible to switch whether light is emitted from Therefore, according to this structure, the illuminating device which can be utilized as digital signage which can blink the character part 204, for example is realizable.
  • the technical scope in the aspect of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the aspect of the present invention.
  • three light emitting elements are arranged side by side in the short direction of the light guide (y-axis direction in FIG. 1).
  • a plurality of light emitting elements are arranged in the light guide. May be arranged side by side in the thickness direction (z-axis direction in FIG. 1).
  • the configuration in which the light emitting element is disposed on the end face of the light guide has been described as an example.
  • the present invention is not limited thereto, and the light emitting element can be used alone.
  • refraction of light on the mounting surface of the light emitting element is considered.
  • the mounting surface of the light emitting element is an interface between a light transmitting member having a refractive index of 1.5 and an air layer having a refractive index of 1.0.
  • the inclination angle of the concave mirror is set to about 10 °.
  • an optical member such as a light diffusion film or a prism sheet may be appropriately disposed between the liquid crystal panel and the backlight.
  • a light diffusion film or a prism sheet may be appropriately disposed between the liquid crystal panel and the backlight.
  • these optical members it is possible to further reduce luminance unevenness and adjust the light diffusion angle and direction.
  • the shape, size, number, arrangement, constituent material, manufacturing method, and the like of various components in the above embodiment are not limited to those illustrated in the above embodiment, and can be changed as appropriate.
  • the aspect of the present invention can be used for a liquid crystal display device and other various display devices capable of performing display using a light control element including a light emitting element.

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

Abstract

L'invention porte sur un élément émetteur de lumière, lequel élément a une surface de montage. L'élément émetteur de lumière comporte un boîtier dans lequel est formée une partie en creux, un miroir concave disposé dans cette partie en creux du boîtier, et une source de lumière disposée en un point focal du miroir concave. Une ligne droite reliant le point central du miroir concave et le point focal croise la ligne normale à la surface de montage en oblique.
PCT/JP2011/078765 2010-12-16 2011-12-13 Élément émetteur de lumière, élément de réglage de lumière, dispositif d'affichage et dispositif d'éclairage Ceased WO2012081569A1 (fr)

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JP2010280263 2010-12-16
JP2010-280263 2010-12-16

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
WO2019013892A1 (fr) * 2017-07-13 2019-01-17 Applied Materials, Inc. Dispositif d'affichage à champ lumineux à micro-del directionnelles et collimatées
US10256382B2 (en) 2016-12-09 2019-04-09 Applied Materials, Inc. Collimated OLED light field display
CN119546009A (zh) * 2024-11-18 2025-02-28 中山市光圣半导体科技有限公司 一种led封装结构及led光源

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JPH02251183A (ja) * 1989-03-24 1990-10-08 Iwasaki Electric Co Ltd 発光ダイオードランプ
JP2001217466A (ja) * 2000-02-03 2001-08-10 Toyoda Gosei Co Ltd 反射型発光装置
JP2009124055A (ja) * 2007-11-16 2009-06-04 Opto Device Kenkyusho:Kk 高出力紫外線発光ダイオード
WO2010050489A1 (fr) * 2008-10-30 2010-05-06 日本ゼオン株式会社 Dispositif source de lumière et dispositif d'affichage à cristaux liquides

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JPH02251183A (ja) * 1989-03-24 1990-10-08 Iwasaki Electric Co Ltd 発光ダイオードランプ
JP2001217466A (ja) * 2000-02-03 2001-08-10 Toyoda Gosei Co Ltd 反射型発光装置
JP2009124055A (ja) * 2007-11-16 2009-06-04 Opto Device Kenkyusho:Kk 高出力紫外線発光ダイオード
WO2010050489A1 (fr) * 2008-10-30 2010-05-06 日本ゼオン株式会社 Dispositif source de lumière et dispositif d'affichage à cristaux liquides

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10256382B2 (en) 2016-12-09 2019-04-09 Applied Materials, Inc. Collimated OLED light field display
CN109983392A (zh) * 2016-12-09 2019-07-05 应用材料公司 准直led光场显示器
US10559730B2 (en) 2016-12-09 2020-02-11 Applied Materials, Inc. Collimated LED light field display
CN109983392B (zh) * 2016-12-09 2021-02-23 应用材料公司 准直led光场显示器
WO2019013892A1 (fr) * 2017-07-13 2019-01-17 Applied Materials, Inc. Dispositif d'affichage à champ lumineux à micro-del directionnelles et collimatées
US10490599B2 (en) 2017-07-13 2019-11-26 Applied Materials, Inc. Collimated, directional micro-LED light field display
CN119546009A (zh) * 2024-11-18 2025-02-28 中山市光圣半导体科技有限公司 一种led封装结构及led光源

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