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WO2018181701A1 - Élément de commande de distribution de lumière, moyen de réglage de distribution de lumière, élément de réflexion, plaque de renfort, unité d'éclairage, dispositif d'affichage et récepteur de télévision - Google Patents

Élément de commande de distribution de lumière, moyen de réglage de distribution de lumière, élément de réflexion, plaque de renfort, unité d'éclairage, dispositif d'affichage et récepteur de télévision Download PDF

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Publication number
WO2018181701A1
WO2018181701A1 PCT/JP2018/013216 JP2018013216W WO2018181701A1 WO 2018181701 A1 WO2018181701 A1 WO 2018181701A1 JP 2018013216 W JP2018013216 W JP 2018013216W WO 2018181701 A1 WO2018181701 A1 WO 2018181701A1
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WO
WIPO (PCT)
Prior art keywords
light
light distribution
diffusion plate
distribution control
control element
Prior art date
Application number
PCT/JP2018/013216
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English (en)
Japanese (ja)
Inventor
透 我妻
佐藤　敦
Original Assignee
株式会社Ｃｔｎｂ
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 株式会社Ｃｔｎｂ filed Critical 株式会社Ｃｔｎｂ
Priority to CN202111329458.8A priority Critical patent/CN114236902A/zh
Priority to JP2018516881A priority patent/JP6818367B2/ja
Priority to CN202111328204.4A priority patent/CN114236901B/zh
Priority to CN201880023542.7A priority patent/CN110637238B/zh
Publication of WO2018181701A1 publication Critical patent/WO2018181701A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G02B5/09—Multifaceted or polygonal mirrors, e.g. polygonal scanning mirrors; Fresnel mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs

Definitions

  • the present invention relates to a light distribution control element, a light distribution adjusting means, a reflecting member, a reinforcing plate, a lighting unit, a display, and a television receiver, and in particular, a light distribution control used for a lighting unit that irradiates light from the back side to a display panel.
  • the present invention relates to an element, a light distribution adjusting unit, a reflecting member, a reinforcing plate, a lighting unit, a display, and a television receiver.
  • a surface light source device in which a plurality of LEDs (Light Emitting Diodes) are arranged in a matrix is used as a backlight of a transmissive image display device such as a liquid crystal display device.
  • LEDs Light Emitting Diodes
  • Such a surface light source device has hitherto been required to be thin and to irradiate the display area of the liquid crystal panel with uniform brightness without unevenness.
  • the light intensity of LEDs can be individually controlled to improve the contrast ratio of different divided areas within the same screen and reduce power consumption.
  • a technique of local dimming is also put into practical use.
  • Such a surface light source device is described in Patent Document 1, for example.
  • the surface light source device described in Patent Document 2 is composed of an optical sheet block and a light source block using a large number of LEDs as light sources.
  • the optical sheet block includes a diffusion light guide plate or a diffusion plate, a reflection sheet, and the like, and diffuses the light from the LED with the diffusion light guide plate or the diffusion plate and repeatedly reflects the light by the reflection sheet to make the liquid crystal display device uniform brightness. The irradiation is even.
  • the contrast ratio of different divided areas in the same screen can be improved by individually controlling the light quantity of the LED in response to the demand for larger liquid crystal panels and higher image quality.
  • a technique of local dimming (dimming control by area) that reduces power consumption has been put into practical use.
  • Such a surface light source device is described in Patent Document 3, for example.
  • the surface light source device of Patent Document 1 reflects light from a light source by a concave mirror and irradiates it toward a liquid crystal panel. Since the shape of a light beam can be made substantially square similar to the shape of a divided region, It is supposed to be optimal for local dimming.
  • Patent Document 1 it is premised that the light source is arranged on the irradiated plane side with respect to the concave mirror, and it is necessary to increase the distance between the light source and the concave mirror, so it is difficult to make the device itself thin. It is.
  • Another problem is that if the optical axis of each light source and the optical axis of each concave mirror do not exactly match, a desired light amount cannot be obtained in each divided region (that is, the light amount varies). Such a problem also occurs due to the deformation of the substrate on which the light source is mounted and the deformation of the concave mirror, and it is extremely important to suppress these deformations. In order to suppress the deformation of the substrate and the deformation of the concave mirror, it is possible to suppress the thickness by increasing the thickness of the substrate or the concave mirror. However, if such a method is used, the surface light source device itself becomes thick. There is a problem of becoming heavy again.
  • the surface light source device of Patent Document 2 reflects light from a light source with a concave mirror and irradiates it toward a liquid crystal panel, and the shape of a light beam can be made into a substantially square shape similar to the shape of a divided region. Therefore, although it is optimal for performing local dimming, it is a configuration in which partial illumination light emitted from a plurality of divided regions is simply combined in a planar manner, and thus the influence of the luminance distribution of the LED is completely removed. Therefore, it is difficult to obtain a substantially uniform illuminance distribution in the divided area.
  • the present invention provides a light distribution control element, a light distribution adjusting means, a reflecting member, and a reinforcing plate for realizing a surface light source device that can obtain a substantially square light beam similar to the shape of a divided region while being thin. It is to provide a reinforcing plate, a lighting unit, a display and a television receiver.
  • the present invention provides: A rectangular plate-shaped light distribution control element for controlling the light distribution of light emitted from the light emitting element, A first main surface facing the light emitting element; A second main surface serving as a back surface with respect to the first main surface; A diffusion element that changes the traveling direction of the light emitted from the light emitting element and incident on the first main surface to a direction substantially perpendicular to the light emitting surface of the light emitting element, and emits the light from the second main surface; It is characterized by providing.
  • the diffusion element corresponding to each light emitting element diffuses the traveling direction of the light emitted from each light emitting element in a direction substantially perpendicular to the light emitting surface of the light emitting element. Nevertheless, a light beam similar to the shape of the divided region can be obtained.
  • the first main surface includes a circular concave incident surface formed at a position corresponding to the light emitting element, and a plurality of annular grooves formed concentrically so as to surround the incident surface,
  • the second main surface can be configured to have a first emission surface formed of a conical concave surface formed at a position corresponding to the incident surface.
  • the second main surface has notches at four corners.
  • the amount of light leaking from the side surface of the light distribution control element is reduced, thereby increasing the total amount of light emitted from the second main surface of the light distribution control element.
  • a plurality of waveguides may be formed at the edge of the second main surface by being reflected by the wall surfaces.
  • the edge here means the side and / or the four corners of the light distribution control element.
  • the diffusing element is imposed on each of N square regions.
  • the second main surface has a protruding portion that gradually protrudes from the central portion toward the four corner portions.
  • the present invention is a light distribution adjusting means attached to the light distribution control element, which is arranged on an optical path of the light emitted from the light emitting element and adjusts the light distribution of the light. It may have a structure and may be configured such that the transmittance decreases as the distance from the light emitting surface of the light emitting element increases.
  • the present invention since it is not necessary to adopt a configuration in which the partial illumination light emitted from the plurality of divided regions is simply combined in a planar manner, it is possible to remove the influence of the luminance distribution of the LED, and to substantially reduce the luminance within the divided regions. A uniform illuminance distribution can be obtained.
  • the plurality of layer structures may be formed by laminating a plurality of substantially circular sheet materials or thin films having different radii around the optical axis of the light emitting element. Further, some layers constituting the plurality of layer structures may have a star-shaped polygonal shape. Furthermore, one or more openings may be formed in a part of the plurality of layer structures.
  • the present invention is a reflecting member that is attached to the light distribution control element, and is a first member that contacts the incident surface of the light distribution control element and reflects light emitted from the incident surface side. You may provide the reflective surface and the 2nd reflective surface which opposes some side surfaces of the said light distribution control element, and reflects the light radiate
  • the light emitted from the side surface of the light distribution control element is reflected by the second reflecting surface and can be incident again from the side surface of the light distribution control element.
  • Light leaking from the control element is reduced, and the amount of light in each dimming region can be accurately controlled.
  • the tip of the side surface part includes at least a part of a sawtooth shape or a wave shape.
  • the reflecting member is formed of a metal or resin thin plate having a heat shrinkage rate of 0.5% or less.
  • the reflectivity of the first reflecting surface and the second reflecting surface is 90% or more.
  • the present invention is a reinforcing plate for an illumination unit, comprising: a square plate-like substrate on which the light emitting element is placed; and the light distribution control element arranged to face the light emitting element.
  • the cross section may be made of a plate-shaped metal having an L-shaped cross section, and may be mounted from the upper surface to the side surface of the substrate.
  • the reinforcing plate is mounted at a position straddling at least the adjacent light distribution control elements.
  • the illumination unit includes a reflection member that is disposed between the substrate and the light distribution control element and reflects light from the light distribution control element, and the reinforcing plate includes the reflection member and the substrate. It is desirable to be located between.
  • the irradiation unit including any of the light distribution control element, the light distribution adjusting means, the reflecting member, and the reinforcing plate of the present invention includes a substrate and N light emitting elements arranged on the substrate. And the light distribution control element.
  • the light distribution control element can also be employed in a display attached to a personal computer or a television receiver.
  • a light distribution control element for realizing a surface light source device that is thin and can obtain a substantially square light beam similar to the shape of a divided region. Moreover, an illumination unit, a display, and a television receiver provided with this light distribution control element are realized.
  • a light distribution adjusting means for an illumination unit that can obtain a substantially uniform illuminance distribution in the divided area while being thin.
  • an illumination unit, a display, and a television receiver provided with this light distribution adjusting means are realized.
  • FIG. 1 is a perspective view showing a configuration of a lighting apparatus according to the first embodiment of the present invention.
  • FIG. 2 is an exploded perspective view illustrating the configuration of the illumination unit included in the illumination device according to the first embodiment of the present invention.
  • FIG. 3 is a diagram illustrating the configuration of the diffusion plate of the illumination unit of FIG. 4 is a cross-sectional view of the diffusion plate of FIG.
  • FIG. 5 is a diagram illustrating the arrangement relationship between the diffusion plate and the adjustment sheet of the illumination unit in FIG.
  • FIG. 6 is a diagram illustrating the configuration of the adjustment sheet of the illumination unit in FIG.
  • FIG. 7 is a schematic diagram for explaining the operational effects of the diffusion plate and the adjustment sheet of the illumination unit included in the illumination device according to the first embodiment of the present invention.
  • FIG. 5 is a diagram illustrating the arrangement relationship between the diffusion
  • FIG. 8 is a photograph and a graph showing a luminance distribution of light emitted from the illumination unit included in the illumination device according to the first embodiment of the present invention.
  • FIG. 9 is a diagram illustrating a configuration of an illumination unit included in the illumination device according to the second embodiment of the present invention.
  • FIG. 10 is a photograph showing the luminance distribution of light emitted from the illumination unit included in the illumination apparatus according to the second embodiment of the present invention.
  • FIG. 11 is a diagram illustrating a configuration of an illumination unit included in an illumination apparatus according to the third embodiment of the present invention.
  • FIG. 12 is a diagram illustrating the configuration of the diffusion plate of the illumination unit of FIG. 13 is a cross-sectional view of the diffusion plate of FIG. FIG.
  • FIG. 14 is a diagram illustrating the configuration of the diffusion plate of the illumination unit provided in the illumination device according to the fourth embodiment of the present invention.
  • FIG. 15 is a diagram illustrating the luminance distribution of the illumination unit using the diffusion plate of the third embodiment and the luminance distribution of the illumination unit using the diffusion plate of the fourth embodiment.
  • FIG. 16 is a diagram for explaining the function and effect of the adjustment sheet 400 shown in FIG.
  • FIG. 17 is a view showing a modification of the adjustment sheet according to the fifth embodiment of the present invention. It is a modification of the diffusing plate 300 shown in FIG.3 and FIG.4, and corresponds to FIG.3 (c).
  • FIG. 1 is a perspective view showing a configuration of a lighting device 1 according to the first embodiment of the present invention.
  • the illumination device 1 is a surface light source device that is disposed on the back side of a liquid crystal panel (not shown) and irradiates light to the liquid crystal panel.
  • the lighting device 1 includes a plurality of lighting units 10 arranged in a matrix according to the size of the liquid crystal panel.
  • FIG. 2 is an exploded perspective view illustrating the configuration of the illumination unit 10 which is a part of the illumination device 1 shown in FIG.
  • the illumination unit 10 includes a square plate-shaped LED unit 100, a reflection sheet 200 disposed on the upper surface of the LED unit 100, and, for example, two diffusion plates disposed on the upper surface of the reflection sheet 200. 300 and four adjustment sheets 400 disposed on each diffusion plate 300, for example.
  • the longitudinal direction of the LED unit 100 is the X-axis direction
  • the lateral direction is the Y-axis direction
  • the direction orthogonal to the X-axis direction and the Y-axis direction (that is, the emission direction of the LED element 110) is Z. It is defined as the axial direction.
  • the positive direction side in the Z-axis direction is sometimes referred to as the top
  • the negative direction side is sometimes referred to as the bottom. Therefore, in the LED unit 100 of FIG. 2, the surface facing the reflection sheet 200 is referred to as the top surface, and the back surface thereof is referred to as the bottom surface.
  • the LED unit 100 of each lighting unit 10 includes, for example, a square plate-like substrate 101 formed of glass epoxy resin, a plurality of LED elements 110 mounted on the upper surface of the substrate 101, and a plurality of devices mounted on the upper surface of the substrate 101.
  • the reinforcing plate 120 is included.
  • an aluminum substrate, FPC (Flexible printed circuit), or the like can be applied to the substrate 101.
  • each LED element 110 aligns the optical axis in the Z-axis direction, and the X-axis direction. It is mounted on the upper surface of the substrate 101 with a pitch: 30 mm, for example, and a Y-axis direction pitch: 30 mm, for example.
  • An anode pattern (not shown) and a cathode pattern (not shown) for supplying power to each LED element 110 are formed on the substrate 101, and each LED element 110 is electrically connected to the anode pattern and the cathode pattern, respectively. Connected.
  • the substrate 101 is electrically connected to a driver circuit (not shown) by a wiring cable (not shown), and a driving current is supplied to each LED element 110 from the driver circuit via an anode pattern and a cathode pattern. It has come to be.
  • a driving current is supplied to each LED element 110, white light with a light amount corresponding to the driving current is emitted from each LED element 110 along the Z-axis direction.
  • each LED element 110 is arranged in each divided region of local dimming, and local dimming (that is, dimming control for each divided region) can be executed by controlling the driver circuit. ing.
  • the reinforcing plate 120 is a thin plate-like metal (for example, copper, iron, aluminum) member for suppressing deformation of the substrate 101 and the diffusion plate 300.
  • a thin plate-like metal for example, copper, iron, aluminum
  • six reinforcing plates 120 are soldered or the like (for example, conductive) in the form of 3 ⁇ 2 rows along each long side of the substrate 101. Surface mounting is performed with an adhesive (silver paste), brazing material, welding / welding, diffusion bonding, and the like.
  • Each reinforcing plate 120 has a unique shape in which the cross section includes an L-shaped portion, and is mounted in a manner that covers at least the side surface from the upper surface of the substrate 101.
  • Each reinforcing plate 120 may have an L-shaped cross section itself, or may cover the bottom surface of the substrate 101 as a U-shape. Further, for example, each reinforcing plate 120 is provided with a V-shaped notch or a dimple from the top surface to the bottom surface, for example, near the center of the outer surface at a position corresponding to the side surface of the substrate 101. May be improved.
  • Each reinforcing plate 120 is provided with, for example, two through holes 120 a communicating with through holes (not shown) formed in the substrate 101. Each through hole 120a is formed in a size that allows the projection 302 (FIGS. 3B and 3C) of the diffusion plate 300 to be inserted therethrough, and is disposed at a position corresponding to the projection 302 of each diffusion plate 300. Has been.
  • each diffusion plate 300 is inserted into the through-hole 120a and fixed by heat welding.
  • an ultraviolet curable adhesive or the like is applied to each protrusion 302 and then irradiated with ultraviolet rays to thereby more firmly fix the substrate 101A. May be.
  • the reinforcing plate 120 only needs to be arranged along the long side of the substrate 101 and is not necessarily limited to the form of 3 ⁇ 2 rows, but is arranged so as to straddle at least two diffusion plates 300. Preferably it is done. According to such a configuration, the two diffusing plates 300 are accurately positioned by the reinforcing plate 120, and therefore are accurately arranged on the XY plane (that is, on the substrate 101). Further, deformation of the substrate 101 and the diffusion plate 300 can be suppressed.
  • the reflection sheet 200 is a member made of a rectangular thin plate-like metal (for example, aluminum) or resin (for example, PET (Polyethylene terephthalate)) sandwiched between the diffusion plate 300 and the substrate 101. As shown in FIG. 2, for example, eight through-holes 200 b corresponding to the positions of eight LED elements 110, for example, and eight protrusions 302 of the diffusion plate 300 pass through the reflection sheet 200. Is formed.
  • the reflection sheet 200 is disposed between the diffusion plate 300 and the substrate 101, the light emitted from the LED element 110 is reflected by the bottom surface of the diffusion plate 300, and the diffusion plate Even if the light does not directly enter 300, it is indirectly incident upon being reflected again by the reflection sheet 200 toward the diffusion plate 300, so that almost all the light emitted from the LED element 110 is emitted through the diffusion plate 300. It has become so.
  • the diffusion plate 300 is arranged on the optical path of the light emitted from the LED elements 110 in a manner covering the reflection sheet 200, and diffuses the light emitted from each LED element 110 around the Z axis inside the diffusion plate 300.
  • It is an optical element made of square plate-shaped optical glass or resin (for example, acrylic, PC (polycarbonate), etc.).
  • FIG. 3 is a diagram illustrating the configuration of the diffusion plate 300 of the present embodiment.
  • 3A is a plan view
  • FIG. 3B is a left side view
  • FIG. 3C is a bottom view.
  • 4 is a cross-sectional view illustrating the configuration of the diffusion plate 300.
  • FIGS. 4 (a) to 4 (e) are cross-sectional views taken along lines AA and BB in FIG. 3 (c), respectively.
  • FIG. 4 is a cross-sectional view taken along a line CC, a cross-sectional view taken along a line DD, and a cross-sectional view taken along a line EE.
  • four patterns that is, four diffusion elements
  • the local area is local.
  • four dimming areas DE1, DE2, DE3, and DE4 that are dimmed by dimming are formed.
  • LED elements 110 are placed on the substrate 101, and therefore, for example, as shown in FIG. They are arranged side by side.
  • each protrusion 302 protruding in the negative direction side of the Z axis are formed at the four corners of the bottom surface of each diffusion plate 300.
  • each protrusion 302 passes through the through hole 200 b of the reflection sheet 200 and the through hole 120 a of the reinforcing plate 120 and protrudes toward the bottom surface side of the substrate 101. Yes.
  • the diffusion plate 300 is fixed to the substrate 101 by thermally welding each protrusion 302 on the bottom surface side of the substrate 101.
  • each diffusion plate 300 corresponding to the positions of the four LED elements 110, for example. ing.
  • the light emitted from each LED element 110 passes through the diffusion plate 300 and reaches the concave conical surface 310, a part of the light is emitted from the concave conical surface 310, and the other part of the light is a concave cone.
  • the surface 310 diffuses in the diffusion plate 300 around the Z axis. Thereby, the uniformity of the diffusing plate 300 is realized.
  • notches 350 are formed at the four corners on the upper surface of each diffusion plate 300. As shown in FIG. The notch 350 emits light from here, thereby reducing the amount of light leaking from the side surface of the diffuser plate 300 and increasing the total amount of light emitted from the upper surface of the diffuser plate 300.
  • each diffusion plate 300 for example, two groove portions 311 extending in parallel from the substantially central portion of each side to the inside, for example, are formed.
  • the groove 311 functions as a waveguide, and when the light emitted from each LED element 110 reaches the groove 311, the light is reflected toward the upper surface of the diffusion plate 300 by the wall surface of the groove 311. For this reason, it is suppressed that the light from each dimming area
  • the shape of the groove 311 is not limited, and the cross section can be various such as a U shape, a U shape, and a V shape. The same applies to other groove portions (groove portions 322a and the like).
  • each diffusion plate 300 has, for example, four recesses formed at positions corresponding to, for example, four concave conical surfaces 310.
  • a conical surface 320 and a circular opening 321 selectively formed continuously with each concave conical surface 320 are provided.
  • the space in each circular opening 321 when the LED element 110 is tall and when the circular opening 321 is not provided, each concave conical surface 320 or this is used.
  • Each LED element 110 is accommodated in a (including space).
  • each concave conical surface 320 is an incident surface on which light emitted from each LED element 110 is incident, and functions as a kind of condensing lens. Therefore, normally, the light emitted from each LED element 110 has a wide angle component (that is, the spread angle is wide), but the spread angle is narrowed by entering each concave conical surface 320. become.
  • each diffusion plate 300 for example, four annular rings are concentrically formed so as to surround each concave conical surface 320. Grooves 322a, 322b, 322c, and 322d are formed in order. In the present embodiment, the depths of the groove portions 322c and 322d apart from the concave conical surface 320 are deeper than the groove portions 322a and 322b (FIGS. 4B and 4D).
  • the light diffused by the surface 310 and the light having a wide spread angle emitted from the LED element 110 are reflected from the upper surface of the diffusion plate 300 by the wall surfaces of the grooves 322a, 322b, 322c, and 322d, and are emitted from the upper surface of the diffusion plate 300. It has come to be.
  • a step-like groove portion 323 that is deeper than the groove portion 322c is formed at the center of the bottom surface of each diffusion plate 300, whereby the dimming region DE1 adjacent in the Y-axis direction is formed. And the dimming area DE4, and the dimming area DE2 and the dimming area DE3, respectively.
  • a step-like groove portion 325 deeper than the groove portions 322c and 322d is formed at the substantially central portion of the bottom surface of each diffusion plate 300, thereby the X-axis.
  • the dimming area DE1 and the dimming area DE2 adjacent to each other in the direction are divided, and the dimming area DE3 and the dimming area DE4 are respectively divided.
  • each dimming area is reflected by the wall surfaces of the groove portions 323 and 325 toward the upper surface of the diffusion plate 300, and thereby, to the adjacent dimming area. It is configured so that the amount of leaked light is reduced.
  • a plurality of step portions 324 are formed at both ends of the bottom surface of each diffusion plate 300 in the Y-axis direction so as to be thin in a staircase shape (FIG. 4B), and staircases are formed at both ends in the X-axis direction.
  • a plurality of stepped portions 326 are formed so as to be thin (FIG.
  • each diffusion plate 300 for example, three groove portions 327 extending in parallel from the center of two sides facing in the Y-axis direction to the inside. Is formed.
  • the light emitted from each LED element 110 reaches the groove portion 327, it is reflected by the wall surface of the groove portion 327 toward the upper surface of the diffusion plate 300, and therefore, between the dimming region DE1 and the dimming region DE2 adjacent in the X-axis direction, In addition, leakage light is reduced between the dimming area DE3 and the dimming area DE4.
  • each diffusion plate 300 has, for example, three grooves extending in parallel from the substantially central portion of the two sides facing in the X-axis direction inward. 328 is formed.
  • the light emitted from each LED element 110 reaches the groove 328, it is reflected by the wall surface of the groove 328 toward the upper surface of the diffusion plate 300, and therefore between the dimming area DE1 and the dimming area DE4 adjacent to each other in the Y-axis direction, and , Leakage light is reduced between the dimming area DE2 and the dimming area DE3.
  • three groove portions 329 extending in the diagonal direction of the diffusion plate 300 are formed at the four corners of the bottom surface of each diffusion plate 300.
  • the light emitted from each LED element 110 reaches the groove 329, it is reflected by the wall surface of the groove 329 toward the upper surface of the diffusion plate 300.
  • ten groove portions 330 extending in a diagonal direction of the diffusion plate 300 are formed at the center of the bottom surface of each diffusion plate 300.
  • the light from each LED element 110 reaches the groove 330, it is reflected by the wall surface of the groove 330 toward the upper surface of the diffusion plate 300.
  • a plurality of circular recesses 331 are formed at the end of the bottom surface of each diffusion plate 300 in the Y-axis direction.
  • the light from each LED element 110 reaches the recess 331, the light is reflected by the wall surface of the recess 331 toward the upper surface of the diffusion plate 300. Therefore, the end of the diffusion plate 300 in the Y-axis direction also extends toward the upper surface of the diffusion plate 300. Light is reflected toward it.
  • the diffusion plate 300 of the present embodiment for example, four patterns (that is, four diffusion elements) corresponding to, for example, the four LED elements 110 are abutted, and each of them has a groove 323. , for example, four dimming areas DE1, DE2, DE3, DE4 are formed. Then, the light from each LED element 110 is reflected in the upper surface direction of the diffusion plate 300 by the concave conical surface 310, the groove portions 322a, 322b, 322c, and 322d formed in the dimming regions DE1, DE2, DE3, and DE4. The light is emitted from the upper surface of the diffusion plate 300.
  • FIG. 18 is a modified example of the diffusion plate 300 shown in FIGS. 3 and 4 and corresponds to FIG. FIG. 18 shows slit regions 340A to 340D in addition to the concave conical surface 320, the groove portion 329, the concave portion 331 and the like described above.
  • the slit regions 340A are formed in a total of four locations within each concave conical surface 320 of the diffusion plate 300 and in the vicinity of each end portion in the short direction of the diffusion plate 300.
  • the slit region 340 ⁇ / b> A has a plurality of depth slits parallel to the longitudinal direction of the diffusion plate 300.
  • each slit is 0.3 mm to 1.5 mm, preferably 0.5 mm to 1.2 mm, and more preferably 0.8 mm to 1.0 mm.
  • the width of the opening of each slit is preferably about 0.05 mm to 0.5 mm, although it depends on the relationship with the pitch between the slits. Further, all the slits may have the same depth, or may become deeper as the distance from the center increases.
  • the shape of each slit may be any one or more of a substantially V shape, a substantially U shape, and a square cross section. The slit conditions may be the same for the slit regions 340B to 340D.
  • the slit regions 340B are formed in two places in the vicinity of the central portion of each end in the longitudinal direction of the diffusion plate 300.
  • the slit region 340 ⁇ / b> B has a plurality of slits parallel to the longitudinal direction of the diffusion plate 300.
  • the slit region 340C is formed between two rows of the concave conical surfaces 320 of the diffusion plate 300, and is formed at a total of two positions at positions sandwiching the center of the diffusion plate 300.
  • the slit region 340 ⁇ / b> C has a plurality of slits parallel to the longitudinal direction of the diffusion plate 300.
  • the slit region 340D is formed between two rows of concave conical surfaces 320 of the diffusion plate 300, and is formed at two positions in total with the center of the diffusion plate 300 interposed therebetween.
  • the slit region 340 ⁇ / b> D has a plurality of slits parallel to the short side direction of the diffusion plate 300.
  • each slit in the slit regions 340A to 340D is not particularly limited, and for example, it may be formed by a laser, may be formed by etching, or may be formed by a mold.
  • the diffusing plate 300 is arranged on the reflection sheet 200 having the side surface portion 202A, and as shown in FIG. In this case, although light passes between the teeth of the side surface portion 202A, the space between the diffusion plates 300 may become dark.
  • the optical path may be changed in a direction orthogonal to the surface direction of the diffusion plate 300. In this case, it is effective to provide the slit regions 340A and 340B.
  • slit region 340A or only the slit region 340B can be provided. Also in this case, it is possible to prevent the space between the diffusion plates 300 from becoming darker than when either of the slit regions 340A and 340B is not provided.
  • the slit region 340B when only one of the slit region 340A and the slit region 340B can be formed, it is preferable to form only the slit region 340B. This is because the gap between the diffusion plates 300 in the vicinity of the slit region 340B tends to be wider than the gap between the diffusion plates 300 in the vicinity of the slit region 340A.
  • the diffusing plate 300 when the diffusing plate 300 is large, the pitch between the LED elements 110 is widened. Therefore, it is effective to provide the slit regions 340C and 340D in order to emit light with uniform intensity.
  • the intensity of light from the diffusion plate 300 can be improved as compared with the case where either of the slit regions 340C and 340D is not provided.
  • the LED elements 110 corresponding to the respective concave conical surfaces 320 have a wider space between columns than between rows, and therefore the intensity of light at the center between columns is lower than the center between rows.
  • FIG. 5 is an exploded perspective view illustrating the positional relationship between the diffusion plate 300 and the adjustment sheet 400 according to the present embodiment.
  • FIGS. 6A and 6B are diagrams illustrating the configuration of the adjustment sheet 400, FIG. 6A is a plan view, and FIG. 6B is an exploded perspective view.
  • the adjustment sheet 400 is adhered on each concave conical surface 310 of the diffusion plate 300 so that the center thereof substantially coincides with the center of the light emitting surface of each LED element 110, and each dimming region DE1.
  • DE2, DE3, DE4 is a substantially circular sheet-like member that adjusts the light distribution of light emitted from DE2, DE3, and DE4.
  • the adjustment sheet 400 of the present embodiment is adhered to the diffusion plate 300, and the adjustment sheet 400 may be fixedly disposed on the optical path of the light emitted from the LED element 110 by some means.
  • the adjustment sheet 400 of the present embodiment includes a first sheet 410, a second sheet 420, and a third sheet 430 having different radii in this order by printing, vapor deposition, or the like on the transparent film 405. It is configured by stacking.
  • Each of the transparent film 405, the first sheet 410, the second sheet 420, and the third sheet 430 of the present embodiment can transmit part of the light from the LED element 110.
  • the transparent film 405 has a thickness of 2.0 ⁇ m to 10 ⁇ m and is made of, for example, PET, and the first sheet 410, the second sheet 420, and the third sheet 430 are made of a urethane resin sheet having a thickness of 2.0 ⁇ m to 10 ⁇ m. It is obtained by punching (for example, a punching process).
  • the first sheet 410, the second sheet 420, and the third sheet 430 may be any material that can adjust the light distribution (that is, the transmittance). In another embodiment, other synthetic resins such as nylon are used. It can also be used.
  • the transparent film 405 may be any film that can connect the first sheet 410 or the like and the diffusion plate 300, and for example, an adhesive layer may be provided on the diffusion plate 300 side. Further, the first sheet 410 and the like can be directly formed on the diffusion plate 300 by printing, vapor deposition, or the like without providing the transparent film 405.
  • the first sheet 410 is, for example, a star-shaped hexagonal sheet member.
  • the second sheet 420 is a sheet member having, for example, a star-shaped octagonal shape having a smaller radius than the first sheet 410.
  • the third sheet 430 is a sheet member having a smaller radius than the second sheet 420, for example, a star octagon.
  • the transparent film 405, the first sheet 410, the second sheet 420, and the third sheet 430 are arranged coaxially with their centers aligned, the second sheet 420 is positioned on the first sheet 410, The 3rd sheet
  • a circular opening 431 is formed at the center of the third sheet 430 of the present embodiment, and the first sheet 410 has, for example, eight circular shapes arranged so as to surround the second sheet 420.
  • An opening 411 and, for example, eight circular openings 412 arranged outside the opening 411 are formed.
  • the second sheet 420 and the third sheet 430 overlap at the center (that is, the part where the opening 431 is formed), and the first sheet 410, The second sheet 420 and the third sheet 430 are overlapped. Further, the second sheet 420 and the third sheet 430 overlap further on the outer side, and on the outer side of the second sheet 420, a portion where the first sheet 410 exists and a portion where the first sheet 410 does not exist (that is, the openings 411 and 412 are formed. Part) is formed.
  • the transmittance will be different accordingly.
  • the light distribution characteristic that is, luminance distribution
  • the overlapping state of the first sheet 410, the second sheet 420, and the third sheet 430 and the size of the openings 411, 412 are illustrated. Now, the position is adjusted, the transmittance is partially changed, and the overall brightness distribution is adjusted to be substantially uniform.
  • FIG. 7 is a schematic diagram for explaining the operational effects of the diffusion plate 300 and the adjustment sheet 400 of the present embodiment.
  • the dimming region DE1 that is, only one diffusion element
  • FIG. 7 only the dimming region DE1 (that is, only one diffusion element) is schematically shown for convenience of explanation, but the same applies to the other dimming regions DE2 to DE4. It is.
  • the LED element 110 emits light having a divergence angle of 0 ° to 180 ° with respect to the central axis of the light emitting surface, as indicated by an arrow a.
  • the light emitted from the LED element 110 is collected by the lens effect of the concave conical surface 320 of the diffusion plate 300, enters the diffusion plate 300, and travels through the diffusion plate 300.
  • a part of the light diffused by the concave conical surface 310 travels inside the diffusion plate 300 and is emitted from the side surface of the diffusion plate 300 (arrow e). Finally, most of the light can be emitted from the upper surface of the diffusion plate 300.
  • FIG. 8 is a photograph and a graph showing the luminance distribution of light emitted from the illumination unit 10 of the present embodiment.
  • FIG. 8 in order to explain the operation and effect of the diffusion plate 300 and the adjustment sheet 400 of the present embodiment, in addition to the luminance distribution (FIG. 8C) when the diffusion plate 300 and the adjustment sheet 400 are present, diffusion is performed.
  • Luminance distribution in the absence of the plate 300 and the adjustment sheet 400 that is, the luminance distribution of the light emitted from the LED element 110
  • FIG. 8B The luminance distribution (that is, the luminance distribution of the light emitted from the diffusion plate 300) is also shown.
  • Each graph in FIGS. 8A to 8C corresponds to each photo, and shows relative luminance at each position of each photo from the X-axis direction and the Y-axis direction.
  • the use of the diffuser plate 300 relatively reduces the amount of light at a position close to the LED element 110 and leaves the LED element 110. Since the amount of light at the position is relatively increased, light is emitted from the entire diffusion plate 300, and the uniformity can be improved.
  • the concave conical surface 310 is provided. A part of the light emitted from the adjustment sheet 400 (arrow b in FIG. 7) is reflected by the adjustment sheet 400, and the reflected light is emitted from a position relatively distant from the adjustment sheet 400. For this reason, hot spots (high brightness portions) due to the LED elements 110 are suppressed, and a uniform amount of light is emitted from the entire diffusion plate 300.
  • the reflection sheet 200 is disposed between the diffusion plate 300 and the substrate 101 (FIGS. 2 and 7), the light emitted from the LED element 110 is reflected by the bottom surface of the diffusion plate 300.
  • the light reflected by the concave conical surface 310 and emitted from the bottom surface of the diffusion plate 300 is diffused again by the reflection sheet 200.
  • the reflection sheet 200 By being reflected toward the plate 300 and entering the diffusion plate 300, almost all of the light emitted from the LED element 110 is emitted from the upper surface of the diffusion plate 300.
  • FIG. 16 is a diagram for explaining the function and effect of the adjustment sheet 400 of the present embodiment, and shows the luminance distribution in the X-axis direction and the Y-axis direction of the light emitted from the illumination unit 10.
  • “ ⁇ ” is the luminance distribution when the adjustment sheet 400 is not arranged
  • “ ⁇ ” is the luminance distribution when only the first sheet 410 is arranged
  • “ ⁇ ” is the first sheet.
  • 410 is a luminance distribution when the second sheet 420 is arranged
  • “ ⁇ ” is a luminance distribution when the first sheet 410, the second sheet 420, and the third sheet 430 are arranged.
  • Table 1 is a table showing the peak value of the luminance distribution (lower graph) in FIG. 16 and the transmittance determined from the peak value
  • Table 2 is the luminance distribution in the Y axis direction of FIG. It is a table
  • the adjustment sheet 400 of the present embodiment includes the first sheet 410, the second sheet 420, and the third sheet 430 formed on the transparent film 405. Therefore, the transmittance of the adjustment sheet 400 is low in the vicinity (that is, the central portion) of the LED element 110 (see “ ⁇ ” in Table 1 and Table 2), and as the distance from the LED element 110 becomes larger (that is, It becomes higher (toward the periphery) (see “ ⁇ ” and “ ⁇ ” in Tables 1 and 2).
  • the luminance distribution of the light emitted from the diffusion plate 300 of the present embodiment has a peak on the emission surface of the LED element 110 as indicated by “ ⁇ ” in FIG.
  • the peak is suppressed, and a substantially uniform luminance distribution is obtained in each of the dimming regions DE1, DE2, DE3, and DE4 (see “ ⁇ ” in FIG. 16).
  • the first sheet 410, the second sheet 420, and the third sheet 430 have a three-layer structure.
  • the present invention is not limited to such a configuration.
  • the thickness of each sheet By changing the thickness, a two-layer structure can be formed, and a four-layer structure or more can also be formed. That is, the adjustment sheet 400 may have a plurality of layer structures. This is the same in the case of the fifth embodiment described later.
  • two diffusion plates 300 are arranged on one substrate 101 on which eight LED elements 110 are mounted.
  • the present invention is limited to such a configuration. Instead, for example, a plurality of substrates 101 corresponding to the size of the diffusion plate 300 may be used.
  • the diffusion plate 300 of the present embodiment has been described on the assumption that four patterns (that is, four diffusion elements) are faced corresponding to the four LED elements 110.
  • the number of impositions is not limited to four. That is, it is only necessary that N diffusion elements are imposed on the diffusion plate 300 for N LED elements 110 (N is an integer of 1 or more).
  • FIG. 9 is a diagram showing a configuration of the illumination unit 10 according to the second embodiment of the present invention.
  • FIG. 9A is a diagram illustrating a state where the diffusion plate 300 is attached to the reflection sheet 200A
  • FIG. 9B is a diagram illustrating a state where the diffusion plate 300 and the reflection sheet 200A are disassembled.
  • the illumination unit of this embodiment is different from that of the first embodiment in that a reflection sheet 200A disposed along with the diffusion plate 300 is formed so as to surround the bottom surface and the side surface of the diffusion plate 300.
  • a reflection sheet 200A disposed along with the diffusion plate 300 is formed so as to surround the bottom surface and the side surface of the diffusion plate 300.
  • FIG. 9 for convenience of explanation, only one diffusion plate 300 and the reflection sheet 200A are shown, and the other configurations are omitted.
  • the size of the reflection sheet 200A is doubled, for example, two diffusions.
  • the plate 300 can be accommodated with respect to one reflective sheet 200A.
  • the reflective sheet 200 ⁇ / b> A (reflective member) of this embodiment is formed of a metal thin plate (for example, aluminum) or a resin (for example, PET (Polyethylene terephthalate)), and has a reflectance of 90% or more. It is a member having a heat shrinkage rate of 0.5% or less.
  • the reflection sheet 200A has a rectangular box shape with an open top shape, and the diffusion plate 300 can be accommodated therein.
  • the reflection sheet 200 ⁇ / b> A has a bottom surface portion 201 ⁇ / b> A formed so as to cover the bottom surface of the diffusion plate 300 and a side surface portion 202 ⁇ / b> A formed so as to cover, for example, four side surfaces of the diffusion plate 300.
  • the bottom surface portion 201 ⁇ / b> A comes into contact with the bottom surface serving as the light incident surface of the diffusion plate 300.
  • the side surface portion 202A is opposed to the side surface of the diffusion plate 300.
  • a first reflecting surface 201Aa is formed on the inner surface of the bottom surface portion 201A, and a second reflecting surface 202Aa is formed on the inner surface of the side surface portion 202A.
  • the side surface portions 202A may or may not be connected to each other at the short side portion. Strictly speaking, in the latter case, the reflection sheet 200A is not box-shaped, but even in this case, it can be said that it is box-shaped as a rough shape.
  • the bottom surface 201A of the reflection sheet 200A has four through holes 200Aa corresponding to the positions of the LED elements 110 and, for example, four through holes 200Ab through which, for example, four protrusions 302 of the diffusion plate 300 pass. Is formed. Moreover, the front-end
  • the shape of the tip portion of the side surface portion 202A is not limited to the sawtooth shape, and may be, for example, a wavy shape, or a sawtooth shape and a wavy shape may be mixed. Moreover, it is not necessary to process the front-end
  • the number and size of the teeth are not limited to the mode as shown in FIG. 9. To put it extremely, even if only one or two large teeth are provided, there is a certain effect, and the tip of the side surface portion 202A. Even if a round is provided on the upper surface of the portion and the corner portion between the upper surface and the side surface is eliminated at the tip of the side surface portion 202A, a certain effect is obtained.
  • the shape of the teeth is not limited to the embodiment shown in FIG.
  • the teeth are shown as symmetrical, but one has a relatively gentle inclination with respect to the bottom surface of the tooth, for example, in the range of 30 to 60 degrees, and the other is relative to the bottom surface.
  • it may have a shape with an inclination that is substantially orthogonal, such as 80 degrees to 90 degrees.
  • the tooth bottom may be 2.0 mm to 4.0 mm, and the tooth height may be about 1.0 mm to 2.0 mm.
  • the same shape and size may be used.
  • the 1 ⁇ 2 period may be about 2.0 mm to 4.0 mm and the amplitude may be 0.5 mm to 1.0 mm.
  • the height from the bottom surface of the reflecting sheet 200A to the bottom of the tooth and the height from the bottom surface to the top of the tooth are 50 with respect to the height of the side surface portion 202A. % To 90%, 90% to 100% is preferable. Further, the width of the bottom portion of the tooth is preferably 2.5% to 10% with respect to the width of the side surface portion 202A.
  • the tooth group composed of a plurality of teeth is shown such that the line connecting each apex is a horizontal straight line, but the line connecting each apex of the tooth group is shown.
  • it may be linear or curved so that the vicinity of the center in the horizontal direction has a mountain shape. This makes it easier for light to face the four corners of the diffusing plate 300, so that there is an advantage that the difference in brightness as the entire diffusing plate 300 is reduced.
  • the size of the reflecting sheet 200A is slightly larger than the size of the diffusing plate 300 so that the diffusing plate 300 can be fitted.
  • the bottom and side surfaces of the diffusing plate 300 are reflected. It is arranged to face the inner surface of the sheet 200A. That is, the bottom surface and the side surface of the diffusion plate 300 are respectively covered with the first reflection surface 201Aa and the second reflection surface 202Aa of the reflection sheet 200A.
  • the light emitted from the bottom surface of the diffusion plate 300 is reflected by the first reflection surface 201Aa on the upper surface side of the diffusion plate 300, and the light emitted from the side surface of the diffusion plate 300 is diffused by the second reflection surface 202Aa.
  • the light enters the diffusion plate 300 again from the side surface of the 300 and is finally reflected on the upper surface side of the diffusion plate 300.
  • FIG. 10 is a photograph showing the luminance distribution of light emitted from the illumination unit of this embodiment.
  • FIG. 10 in order to demonstrate the effect of the reflective sheet 200A of this embodiment, in addition to the luminance distribution (FIG. 10B) when the reflective sheet 200A of this embodiment is used, the first implementation is performed.
  • the luminance distribution (FIG. 10A) of the form (that is, when the reflection sheet 200 is used) is also shown.
  • FIGS. 10A and 10B each mean the lighting unit shown in FIG. 9A, and only the LED element 110 of the lighting unit in the 2nd row and the 2nd column. The state where is turned on is shown.
  • the light emitted from the side surface of the diffusion plate 300 of the lighting unit in the second row and second column is The light is incident on the diffusion plate 300 again from the side surface of the diffusion plate 300 by the two reflection surfaces 202Aa, and finally reflected toward the upper surface side of the diffusion plate 300 and is emitted from the upper surface of the diffusion plate 300. It can be used. Therefore, when local dimming is performed using the configuration of the present embodiment, the amount of light in each dimming region can be accurately controlled.
  • FIG. 11 is a diagram illustrating a configuration of an illumination unit 10A included in an illumination apparatus according to the third embodiment of the present invention.
  • 11 (a) is a plan view
  • FIG. 11 (b) is a bottom view
  • FIG. 11 (c) is an exploded perspective view.
  • the illumination unit 10A of the present embodiment includes a square plate LED unit 100A, a reflection sheet 200B disposed on the upper surface of the LED unit 100A, and, for example, 2 disposed on the upper surface of the reflection sheet 200B.
  • Individual diffusion plates 600 Individual diffusion plates 600.
  • the illumination unit 10A of this embodiment is different from the illumination unit 10 of the first embodiment in that, for example, two (X-axis direction) ⁇ one (Y-axis direction) LED elements 110 are formed on the substrate 101A. It is the point mounted on the upper surface and the point that one pattern (that is, one dimming region) is formed on each diffusion plate 600 corresponding to each LED element 110.
  • the size of the diffusion plate 600 of the present embodiment and the size of the diffusion plate 300 of the first embodiment are substantially the same. That is, in this embodiment, the four dimming areas DE1, DE2, DE3, and DE4 of the first embodiment are covered with one dimming area (that is, the diffusion plate 600).
  • two through holes 200Ba corresponding to the positions of the two LED elements 110 and, for example, two through holes 200Bb through which the two protrusions 602 of the diffusion plate 600 pass are formed in the reflection sheet 200B.
  • the reflection sheet 200B is disposed between the diffusion plate 600 and the substrate 101A, and the light emitted from the LED element 110 does not enter the diffusion plate 600, and thus the diffusion plate Even if the light is reflected on the bottom surface of 600 or once emitted from the bottom surface of the diffusion plate 600 or emitted from the bottom surface of the diffusion plate 600, it is reflected again toward the bottom surface of the diffusion plate 600 by the reflection sheet 200B. Since the light enters the diffusion plate 600 again, almost all of the light emitted from the LED element 110 is emitted from the upper surface of the diffusion plate 600.
  • the diffusion plate 600 is disposed on the optical path of the light emitted from the LED elements 110 in a manner covering the reflection sheet 200B, and the light emitted from each LED element 110 is transmitted.
  • the optical element is a rectangular plate-shaped optical glass or resin (for example, acrylic, PC (polycarbonate), etc.) that diffuses around the Z-axis inside the diffusion plate 600.
  • FIG. 12 is a diagram illustrating the configuration of the diffusion plate 600 of the present embodiment.
  • FIG. 12A is a plan view
  • FIG. 12B is a right side view
  • FIG. 12C is a bottom view.
  • FIG. 13 is a cross-sectional view illustrating the configuration of the diffusion plate 600.
  • FIGS. 13A and 13B are a cross-sectional view taken along line AA and a line BB in FIG. 12C, respectively.
  • each diffusion plate 600 for example, four columnar projections 602 projecting in the negative direction side of the Z-axis are formed.
  • each protrusion 602 passes through the through hole 200Bb of the reflection sheet 200B and the through hole 120a of the reinforcing plate 120 and protrudes toward the bottom surface side of the substrate 101A. Yes.
  • the diffusion plate 600 is fixed to the substrate 101A by thermally welding each protrusion 602 on the bottom surface side of the substrate 101A (FIG. 11C).
  • each diffusion plate 600 has one concave conical surface 610 corresponding to the position of one LED element 110, for example. Is formed.
  • the concave conical surface 610 When the light emitted from the LED element 110 passes through the diffusion plate 600 and reaches the concave conical surface 610, a part of the light is emitted from the concave conical surface 610, and the other part of the light is a concave conical surface. 610 is diffused in the diffusion plate 600 around the Z axis. Thereby, the uniformity of the diffusing plate 600 is realized.
  • notches 650 are formed on the upper surface of the diffusion plate 600 at the four corners.
  • the notch 650 emits light from here, thereby reducing the amount of light leaking from the side surface of the diffuser plate 600 and increasing the total amount of light emitted from the upper surface of the diffuser plate 600.
  • the diffusing plate 600 for example, four projecting portions 619 are formed which are arranged diagonally and project gradually upward from the central portion toward the four corner portions.
  • the number of LED elements 110 corresponding to this is also four, When one dimming region is formed as described above, the number of LED elements 110 is also one, so that the maximum light amount is 1 ⁇ 4 that of FIG. 3 and the light amount is reduced.
  • the light quantity fall of the four corners is suppressed by providing the protrusion part 619.
  • a reduction in the amount of light can be further suppressed by applying an embossing process (concave / convex processing) with a concavo-convex difference of several tens of ⁇ m on the upper surface of the protruding portion 619.
  • the diffusion plate 600 for example, eight groove portions 611 extending from the four corner portions along the respective sides are formed.
  • the groove part 611 functions as a waveguide, and when light from each LED element 110 reaches the groove part 611, it is reflected by the wall surface of the groove part 611.
  • each diffusion plate 600 that is, each dimming region
  • groove portions 613 that extend toward the concave conical surface 610 are formed at both ends in the X-axis direction of the central portion in the Y-axis direction of the diffusion plate 600.
  • Each groove portion 613 includes, for example, four groove portions 613a, 613b, 613c, and 613d that function as waveguides.
  • the respective wall surfaces diffuse. Reflected toward the top surface of the plate 600.
  • the formation positions of the groove portions 613a and the like are not limited to the mode illustrated in FIG. 12A, and may be formed at both ends in the Y axis direction of the center portion of the diffusion plate 600 in the X axis direction. In this case, the groove 611 adjacent to it is shortened.
  • the formation positions of the grooves 611, 613 a, and 615 are the same in the case of the diffusion plate 300.
  • the grooves 611, 613 a, and 615 are physically separated from the LED element 110. What is necessary is just to form suitably in a well-balanced place. This makes it possible to emit light uniformly from the upper surface of either of the diffusion plate 300 and the diffusion plate 600.
  • the diffusion plate 600 (that is, each dimming region) can suppress light from leaking to the adjacent dimming region, similarly to the diffusion plate 300.
  • eight arc-shaped groove portions 615 around the concave conical surface 610 are formed in the vicinity of, for example, the four protrusions 619 on the upper surface of the diffusion plate 600.
  • the groove portion 615 functions as a waveguide. When light from each LED element 110 reaches the groove portion 615, it is reflected by the wall surface of the groove portion 615 toward the upper surface of the diffusion plate 600 and emitted from the upper surface of the diffusion plate 600.
  • each diffusion plate 600 has a concave conical surface 620 formed at a position corresponding to the concave conical surface 610, and a concave portion.
  • a conical surface 620 and a circular opening 621 that is selectively formed continuously are provided.
  • the concave conical surface 620 is an incident surface on which light emitted from the LED element 110 is incident, and functions as a kind of condensing lens. Therefore, normally, the light emitted from each LED element 110 has a wide angle component (that is, the spread angle is wide), but the spread angle is narrowed by entering each concave conical surface 620. become.
  • a plurality of annular groove portions 622 are concentrically formed on the bottom surface of each diffusion plate 600 so as to surround the concave conical surface 620. Is formed.
  • the depth of the groove 622 is deeper as the groove 622 formed at a position away from the concave conical surface 620 (FIG. 4A), and the light diffused by the concave conical surface 610 and the spread emitted from the LED element 110.
  • Light having a wide angle is reflected from the wall surface of the groove 622 toward the upper surface of the diffusion plate 600, and is emitted from the upper surface of the diffusion plate 600.
  • step portions 625 and 640 are formed on the bottom surface of the diffusion plate 600.
  • the step 625 is formed at the four corners, and the step 640 is formed at a position corresponding to the groove 613.
  • the stepped portions 625 and the like are all thinner than the peripheral portion.
  • step portion 625 a plurality of arc-shaped groove portions 626 are formed, and in the step portion 640, a plurality of arc-shaped groove portions 641 whose depth gradually increases toward the outside are formed ( FIG. 13 (a) and FIG. 13 (b)).
  • a plurality of circular recesses 631 and 633 are formed at the bottom of the diffusion plate 600 along the sides.
  • the light from each LED element 110 reaches the recesses 631 and 633, the light is reflected toward the upper surface of the diffusion plate 600 by the wall surfaces of the recesses 631 and 633.
  • one pattern that is, one diffusing element
  • one dimming region is formed.
  • the light from the LED element 110 is reflected toward the upper surface of the diffusion plate 600 by the concave conical surface 610 and the groove portion 622 formed on the diffusion plate 600 and emitted from the upper surface of the diffusion plate 600.
  • FIG. 14 is a plan view showing a modification of the diffusion plate 600 according to the third embodiment of the present invention. As shown in FIG. 14, the diffusion plate 600A of this embodiment (this modification) is different from the diffusion plate 600 of the third embodiment in that, for example, four protrusions 619 are not formed on the upper surface.
  • FIG. 15 is a diagram showing the luminance distribution of the lighting unit using the diffusion plate 600 of the third embodiment and the luminance distribution of the lighting unit using the diffusion plate 600A of the fourth embodiment.
  • the graph is a graph showing the luminance distribution in one diagonal direction of the diffusion plate 600 and the diffusion plate 600A (A direction in FIG. 15), and the graph on the right side of FIG. 15 is the other pair of the diffusion plate 600 and the diffusion plate 600A. It is a graph which shows the luminance distribution of an angular direction (B direction of FIG. 15).
  • the light emitted from the LED element 110 is diffused in the diffusion plate 600 and the diffusion plate 600A. Since the amount of light is relatively decreased and the amount of light at a position away from the LED element 110 is relatively increased, light is emitted from the entire diffusion plate 600 and the diffusion plate 600A, and the uniformity can be improved.
  • the luminance distribution of the diffusion plate 600 is higher by about 100 cd / m 2 than the diffusion plate 600A. This is due to the influence of, for example, four protrusions 619 formed on the upper surface of the diffusion plate 600, and it can be seen that the protrusions 619 function effectively to increase the luminance.
  • FIG. 17 is a view showing a modification of the adjustment sheets 400A to 400C according to the fifth embodiment of the present invention, and corresponds to FIG. In FIG. 17 (a), instead of the star-shaped polygonal shape, the first sheet 410A rounded at each tip, the second sheet 420A rounded at some tips, and rounded at each tip.
  • the third sheet 430A is shown.
  • FIG. 17B shows a first sheet 410B that includes two types of large and small substantially circular parts in place of the leading end portion of the first sheet 410A, parts with four corners cut, and the four corners and their substantially intermediate positions.
  • FIG. 17C shows a first sheet 410C obtained by combining the first sheet 410 shown in FIG. 6B and the first sheet 410B shown in FIG. 17B, and FIG. A second sheet 420C having the same shape as the illustrated second sheet 420 and a third sheet 430C having the same shape as the third sheet 430 illustrated in FIG. 6B are illustrated.
  • the effect described with reference to FIG. 16 can be obtained as in the case of the adjustment sheet 400 shown in FIG. Therefore, in this specification, the first sheets 410A to 410C, the second sheets 420A to 420C, and the third sheets 430A to 430C constituting the adjustment sheets 400A to 400C as shown in FIG. Shall be included.
  • the illumination unit using the diffusion plate 600 described above can be used for a liquid crystal display attached to a personal computer, and can also be used for a television receiver such as a so-called liquid crystal television. Moreover, this illumination unit can be used also for apparatuses which do not have a liquid crystal panel, such as a general lighting apparatus and a street sign apparatus, but have a diffusion cover, a translucent resin plate, and the like.

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  • Engineering & Computer Science (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
  • Semiconductor Lasers (AREA)
  • Led Device Packages (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

Le problème décrit par la présente invention est de fournir un élément de commande de distribution de lumière pour mettre en oeuvre un dispositif de source de lumière de surface qui permet d'obtenir un flux de lumière approximativement carré similaire à la forme d'une région divisée tout en étant de type mince. La solution selon l'invention porte sur un élément de commande de distribution de lumière en forme de plaque carrée pour commander la distribution de la lumière émise à partir de N (N est un entier supérieur ou égal à 1) des éléments électroluminescents disposés sur un substrat est pourvu : d'une première surface principale qui fait face aux N éléments électroluminescents; une seconde surface principale qui fait face à la première surface principale; et N éléments de diffusion qui diffusent chaque lumière diffuse incidente sur la première surface principale à partir de chacun des éléments électroluminescents dans une direction approximativement perpendiculaire à l'axe optique de l'élément électroluminescent et émettre la lumière à partir de la seconde surface principale.
PCT/JP2018/013216 2017-03-31 2018-03-29 Élément de commande de distribution de lumière, moyen de réglage de distribution de lumière, élément de réflexion, plaque de renfort, unité d'éclairage, dispositif d'affichage et récepteur de télévision WO2018181701A1 (fr)

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CN202111329458.8A CN114236902A (zh) 2017-03-31 2018-03-29 配光控制元件、配光调节机构、反射部件、增强板、照明单元、显示器以及电视机
JP2018516881A JP6818367B2 (ja) 2017-03-31 2018-03-29 配光制御素子、配光調整手段、反射部材、補強板、照明ユニット、ディスプレイ及びテレビ受信機
CN202111328204.4A CN114236901B (zh) 2017-03-31 2018-03-29 配光控制元件、配光调节机构、反射部件、增强板、照明单元、显示器以及电视机
CN201880023542.7A CN110637238B (zh) 2017-03-31 2018-03-29 配光控制元件、配光调节机构、反射部件、增强板、照明单元、显示器以及电视机

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CN114236901B (zh) 2023-08-22
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JP6818367B2 (ja) 2021-01-20
JPWO2018181701A1 (ja) 2019-04-04
JP2019009105A (ja) 2019-01-17
JP6818360B2 (ja) 2021-01-20
TW201837531A (zh) 2018-10-16
TW202131051A (zh) 2021-08-16
TWI769733B (zh) 2022-07-01
TWI769235B (zh) 2022-07-01
CN110637238B (zh) 2021-12-07
JP6786037B2 (ja) 2020-11-18
CN114236901A (zh) 2022-03-25
CN110637238A (zh) 2019-12-31
TW202125032A (zh) 2021-07-01
JP2019009107A (ja) 2019-01-17

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