CN114815382A - Light flux controlling member, light emitting device, surface light source device, and display device - Google Patents

Light flux controlling member, light emitting device, surface light source device, and display device Download PDF

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Publication number
CN114815382A
CN114815382A CN202210047307.1A CN202210047307A CN114815382A CN 114815382 A CN114815382 A CN 114815382A CN 202210047307 A CN202210047307 A CN 202210047307A CN 114815382 A CN114815382 A CN 114815382A
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CN
China
Prior art keywords
light
flux controlling
controlling member
incident
light flux
Prior art date
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Pending
Application number
CN202210047307.1A
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Chinese (zh)
Inventor
桃井拓郎
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Enplas Corp
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Enplas Corp
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Publication of CN114815382A publication Critical patent/CN114815382A/en
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    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
    • 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
    • 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
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • 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
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • 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
    • 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
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
    • 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
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Planar Illumination Modules (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Led Device Packages (AREA)

Abstract

The invention relates to a light flux controlling member, a light emitting device, a surface light source device and a display device. The light flux controlling member includes: a plurality of incidence units each including an incidence surface and a reflection surface; a plurality of exit units; and a step surface. In an incident unit including a part of a side surface of the light flux controlling member, a distance between a center of the reflecting surface and a first point, which is an arbitrary point on an edge on the front surface side of the stepped surface, is longer than a distance between the center of the reflecting surface and a second point, which is a point on the edge on the front surface side of the side surface of the light flux controlling member on the opposite side of the first point with respect to the center of the reflecting surface.

Description

Light flux controlling member, light emitting device, surface light source device, and display device
Technical Field
The invention relates to a light flux controlling member, a light emitting device, a surface light source device and a display device.
Background
In some cases, a direct type surface light source device is used as a surface light source device in a transmission type image display device such as a liquid crystal display device. In recent years, a direct type surface light source device having a plurality of light emitting elements as a light source has been used (for example, see patent document 1).
Patent document 1 describes an optical module including: a light guide plate; a plurality of light emitting elements arranged in a matrix on one surface of the light guide plate; and a light-shielding scattering layer disposed on the other surface of the light guide plate. The light guide plate includes: a first main surface serving as a light emitting surface; and a second main surface serving as an incident surface. The first main surface has a recess including an inclined surface and a flat portion. Further, a light shielding and scattering layer is disposed so as to cover the recess.
The light emitted from the light emitting element enters the light guide plate through the second main surface, is emitted to the outside through the first main surface, and is reflected to the side. The light emitted from the first main surface is diffused by the light shielding and scattering layer.
Documents of the prior art
Patent document
Patent document 1: specification of U.S. patent application publication No. 2020/0176650
Disclosure of Invention
Problems to be solved by the invention
However, the optical module described in patent document 1 has room for study in that light emitted from the light emitting element is uniformly emitted.
Therefore, an object of the present invention is to provide a light flux controlling member capable of more uniformly irradiating light emitted from a light emitting element. Another object of the present invention is to provide a light emitting device, a surface light source device, and a display device each having the light flux controlling member.
Means for solving the problems
A light flux controlling member according to an embodiment of the present invention is a light flux controlling member for controlling distribution of light emitted from a plurality of light emitting elements arranged on a substrate, including: a plurality of light emitting elements that emit light, respectively, and that emit light; a plurality of emission units arranged between the plurality of incidence units in a direction along the surface of the substrate, and configured to guide and emit light incident from the plurality of incidence units; and a step surface disposed between the incident unit and the emission unit on the front side of the light flux controlling member such that a surface on the front side of the incident unit is higher than a surface on the front side of the emission unit, the incident unit including: an incident surface disposed on a rear surface side of the light flux controlling member, the incident surface being configured to allow light emitted from the corresponding light emitting element to enter; and a reflecting surface disposed on the front surface side of the light flux controlling member with the incident surface interposed therebetween, for reflecting light incident from the incident surface in a lateral direction, wherein in the incident unit including a part of the side surface of the light flux controlling member, in a plan view of the light flux controlling member, an interval between a center of the reflecting surface and a first point that is an arbitrary point on an edge on the front surface side of the stepped surface is longer than an interval between the center of the reflecting surface and a second point that is a point on the edge on the front surface side of the side surface of the light flux controlling member and that is located on an opposite side of the first point with respect to the center of the reflecting surface.
A light-emitting device according to an embodiment of the present invention includes: a plurality of light emitting elements disposed on the substrate; and a light flux controlling member of the present invention disposed on the plurality of light emitting elements.
A surface light source device according to an embodiment of the present invention includes: a plurality of light emitting devices of the present invention; and a light diffusion plate which diffuses and transmits light emitted from the plurality of light emitting devices.
A display device according to an embodiment of the present invention includes: the surface light source device of the present invention; and a display member to which light emitted from the surface light source device is irradiated.
Effects of the invention
According to the present invention, light emitted from the light-emitting element can be irradiated more uniformly.
Drawings
Fig. 1A and 1B are views showing the structure of a surface light source device according to embodiment 1 of the present invention;
fig. 2A and 2B are another views showing the structure of a surface light source device according to embodiment 1 of the present invention;
fig. 3 is a partially enlarged sectional view of the surface light source device;
fig. 4 is a perspective view showing the structure of a light flux controlling member according to embodiment 1 of the present invention;
fig. 5A and 5B are diagrams showing the structure of a light flux controlling member according to embodiment 1 of the present invention;
fig. 6A and 6B are diagrams showing the structure of a light flux controlling member according to embodiment 1 of the present invention;
fig. 7A and 7B are diagrams for explaining a relationship between a distance between an optical axis of the light emitting element and the second step surface, and a luminance distribution;
fig. 8 is a view for explaining a distance between the center of the reflecting surface and an arbitrary first point on the front-side edge of the stepped surface and a relationship between a second point on the front-side edge of the side surface of the light flux controlling member and the center of the reflecting surface;
fig. 9 is a diagram showing a structure of a light flux controlling member according to embodiment 2;
fig. 10A to 10F are optical path diagrams of a light-emitting device according to embodiment 1 of the present invention;
fig. 11A to 11C are optical path diagrams of the light-emitting device of embodiment 2; and
fig. 12 shows the luminance distribution of the light-emitting device of embodiment 2.
Description of the reference numerals
100 area light source device
100' display device
102 display unit
110 casing
112 base plate
114 top plate
120 light emitting device
130 light diffusion plate
140 base plate
150 light emitting element
160. 260 light beam control member
161 incident unit
162. 262 emergent unit
163 step surface
163a first step surface
163b second step surface
164. 264 first emission unit
165 second exit unit
171 first incident surface
172 first reflecting surface
173 first side
173a arc part
173b straight line part
175 light direction changing part
175a first alteration plane
175b second modified surface
175c third modified surface
176 first optical control unit
176a inclined surface
176b connecting surface
177. 277 second side surface
178 second reflecting surface
179 second optical control section
179a bottom surface
A1 first axis
A2 second shaft
L1 interval
L2 distance between centers
LA optical axis
P1 first point
Second point of P2
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the drawings. In the following description, a surface light source device applied to a backlight of a liquid crystal display device or the like will be described as a representative example of the surface light source device of the present invention. These surface light source devices can be used as a display device 100' by being combined with a display member 102 (for example, a liquid crystal panel) to which light from the surface light source devices is irradiated (see fig. 1B).
[ embodiment 1]
(Structure of surface light Source device and light emitting device)
Fig. 1A, 1B, 2A, 2B, and 3 are diagrams showing the structure of a surface light source device 100 according to embodiment 1 of the present invention. Fig. 1A is a plan view of a surface light source device 100 according to embodiment 1 of the present invention, and fig. 1B is a front view. Fig. 2A is a cross-sectional view taken along line a-a shown in fig. 1B, and fig. 2B is a partially enlarged view of fig. 2A. Fig. 3 is a partially enlarged view of a cross section taken along line B-B shown in fig. 1A.
As shown in fig. 1A, 1B, 2A, 2B, and 3, the surface light source device 100 of the embodiment includes a housing 110, a plurality of light emitting devices 120, and a light diffusion plate 130. The plurality of light emitting devices 120 are arranged in a matrix on the bottom plate 112 of the case 110. The inner surface of the bottom plate 112 functions as a diffuse reflection surface. Further, an opening is provided in the top plate 114 of the housing 110. The light diffusion plate 130 is disposed so as to cover the opening, and functions as a light emitting surface. The size of the light emitting surface is not particularly limited, and is, for example, about 400mm × about 700 mm.
As shown in fig. 3, light emitting device 120 includes a substrate 140, a plurality of light emitting elements 150, and a light flux controlling member 160. Light flux controlling member 160 is fixed to substrate 140. The substrate 140 is fixed to a predetermined position on the bottom plate 112 of the case 110.
The light emitting element 150 is a light source of the surface light source device 100 and is mounted on the substrate 140. The light emitting element 150 is a Light Emitting Diode (LED) such as a white light emitting diode. In addition, the kind of the light emitting element 150 is not particularly limited. Preferably, the light emitting element 150 is a light emitting element 150 (e.g., COB type light emitting diode) that emits light from the top and side surfaces. In the present embodiment, a light-emitting element 150 having a light-emitting surface smaller than that of a conventional light-emitting element is used. The length of one side of the light-emitting surface is, for example, in the range of 0.1mm to 1.0 mm.
As shown in fig. 2A and 2B, in the present embodiment, each of light emitting elements 150 and light flux controlling members 160 is arranged in a grid pattern and spaced apart from each other. Also, the interval L1 between the light beam controlling members 160 adjacent to each other may be less than half of the inter-center distance L2 of the plurality of light emitting elements 150. Here, the "distance L2 between the centers of the plurality of light emitting elements 150" refers to a distance between the centers of two light emitting elements 150 belonging to different light emitting devices 120. This allows light to be guided more widely by light flux controlling member 160, thereby suppressing dimming between light emitting devices 120.
It is also important to arrange adjacent light flux controlling members 160 so that light flux controlling members 160 do not contact each other with a gap therebetween. If the light diffusing plate is arranged without an open space, the light emitted from the end portion enters or is reflected by the end portion of the adjacent light flux controlling member 160, and the light emission quality on the light diffusing plate 130 is adversely affected.
Light flux controlling member 160 is an optical member that controls the distribution of light emitted from light emitting element 150. Light flux controlling member 160 is fixed to substrate 140. As will be described later, light flux controlling member 160 includes a plurality of incident units 161, and light flux controlling member 160 is disposed on light emitting elements 150 such that the axes of incident units 161 and emission units 162 overlap optical axes LA of light emitting elements 150. In light flux controlling member 160 of the present embodiment, incidence section 161 (first incidence surface 171 and first reflection surface 172) of light flux controlling member 160 is rotationally symmetric (circularly symmetric). The rotation axis of the incident unit 161 is referred to as "the first axis a1 of the first incident surface 171" or "the second axis a2 of the first reflection surface 172". The "optical axis LA of the light emitting element 150" is a light ray from the center of the three-dimensional outgoing light flux from the light emitting element 150. A gap for releasing heat emitted from light emitting element 150 to the outside is formed between substrate 140 on which light emitting element 150 is mounted and the back surface of light flux controlling member 160.
Light flux controlling member 160 is formed by integral molding. The material of light flux controlling member 160 is not particularly limited as long as it can pass light of a desired wavelength. For example, the material of light flux controlling member 160 is a light-transmitting resin such as polymethyl methacrylate (PMMA), Polycarbonate (PC), or epoxy resin (EP), or glass.
The light diffusion plate 130 is a plate-shaped member having light diffusion properties, and diffuses and transmits light emitted from the plurality of light emitting devices 120. In general, the size of the light diffusion plate 130 is almost the same as that of a display member such as a liquid crystal panel. The light diffusion plate 130 is formed of a light-transmitting resin such as polymethyl methacrylate (PMMA), Polycarbonate (PC), Polystyrene (PS), or styrene-methyl methacrylate copolymer resin (MS). In order to impart light diffusion properties, fine irregularities are formed on the surface of the light diffusion plate 130, or light diffusers such as beads are dispersed in the light diffusion plate 130.
In the surface light source device 100 of the present embodiment, the light emitted from each light emitting element 150 is expanded by the light flux controlling member 160 to irradiate a wide range of the light diffusion plate 130. The light emitted from each light flux controlling member 160 is further diffused by the light diffusion plate 130. As a result, the surface light source device 100 of the present embodiment can uniformly irradiate a planar display member (for example, a liquid crystal panel).
(Structure of light flux controlling Member)
Fig. 4, 5A, 5B, 6A, and 6B are diagrams illustrating the configuration of light flux controlling member 160. Fig. 4 is a perspective view of light flux controlling member 160 according to embodiment 1. Fig. 5A is a plan view of light flux controlling member 160 according to embodiment 1, and fig. 5B is a bottom view. Fig. 6A is a side view of light flux controlling member 160 according to embodiment 1, and fig. 6B is a cross-sectional view taken along line a-a shown in fig. 5A.
As shown in fig. 4, 5A, 5B, 6A, and 6B, light flux controlling member 160 includes a plurality of incident units 161, a plurality of exit units 162, and a step surface 163. Although not particularly shown, light flux controlling member 160 of the present embodiment further includes a support leg.
The plurality of incident units 161 are arranged in a grid shape corresponding to the arrangement of the light emitting elements 150. The plurality of emission units 162 are disposed between the plurality of incidence units 161 in a lateral direction, which is a direction along the surface of the substrate 140. Light flux controlling member 160 is disposed on light emitting elements 150 such that first axis a1 of first incident surface 171 of each incident unit 161 (second axis a2 of first reflecting surface 172) coincides with optical axis LA of each light emitting element 150. In the present embodiment, the plurality of incidence units 161 are disposed at positions corresponding to the four corners of the virtual quadrangle. The plurality of exit units 162 includes: four first emission units 164 arranged at positions corresponding to four sides of the virtual quadrangle; and one second emission unit 165 arranged at a position surrounded by the virtual quadrangle. In the present embodiment, the shape of light flux controlling member 160 in plan view is a square with four corners chamfered.
The plurality of incident units 161 respectively allow light emitted from the light emitting element 150 to enter and allow a part of the light to exit. The plurality of incident units 161 respectively include a first incident surface 171, a first reflecting surface 172, and a first side surface 173.
First incident surface 171 is disposed on the rear surface side of light flux controlling member 160 so as to face light emitting element 150. First incident surface 171 functions as an incident surface on which light emitted from light-emitting element 150 is incident into light flux controlling member 160. The shape of the first incident surface 171 is not particularly limited as long as the above-described function can be exhibited. In the present embodiment, first incident surface 171 is an inner surface of a concave portion formed on the back surface side of light flux controlling member 160. The shape of the first incident surface 171 is a shape that intersects the optical axis LA of the light emitting element 150 and is rotationally symmetric (circularly symmetric) about the first axis a1 of the first incident surface 171. A generatrix from the central portion to the outer peripheral portion of the rotational symmetry plane is a convex curve with respect to the light emitting element 150. The first incident surface 171 is a curved surface in which the generatrix is rotated by 360 ° with the first axis a1 as a rotation axis. That is, the first incident surface 171 has an aspheric curved surface whose height from the light emitting element 150 gradually decreases with distance from the first axis a 1. The inclination angle of the first incident surface 171 with respect to the first axis a1 becomes gradually larger as approaching the outer peripheral portion from the central portion.
First reflecting surface 172 is disposed on the side opposite to first incident surface 171. The first reflecting surface 172 functions as an optical surface for reflecting light incident from the first incident surface 171 in the lateral direction. The shape of the first reflecting surface 172 is not particularly limited as long as the above-described function can be exerted. In the present embodiment, first reflecting surface 172 is an inner surface of a recess formed on the front side of light flux controlling member 160. The first reflecting surface 172 is a surface that intersects the optical axis LA of the light emitting element 150 and is rotationally symmetric (circularly symmetric) about the second axis a2 of the first reflecting surface 172. In addition, a bus line from the center portion to the outer peripheral portion of the rotational symmetry plane is a curve having a concave shape with respect to the light emitting element 150. The first reflecting surface 172 is a curved surface in which the second axis a2 is a rotation axis and the generatrix is rotated by 360 °. The outer peripheral portion of the first reflecting surface 172 is disposed and formed on the front surface side of the portion of the first reflecting surface 172 intersecting the second axis a 2. For example, the first reflecting surface 172 is a curved surface of an aspheric shape whose height from the light emitting element 150 gradually increases as approaching the outer peripheral portion from the central portion. The inclination angle of the first reflection surface 172 with respect to the plane direction of the substrate 140 becomes gradually smaller as approaching from the central portion to the outer peripheral portion.
The first side surface 173 is disposed outside the beam control member 160 with respect to the first incident surface 171 and the first reflecting surface 172. First side 173 is a portion of a side of beam control member 160. In the present embodiment, first side surface 173 includes an arc-shaped circular arc portion 173a and a straight portion 173b continuous with arc-shaped portion 173a in a plan view of light flux controlling member 160.
Step surface 163 is disposed on the front surface side of light flux controlling member 160. The stepped surface 163 connects the incident unit 161 and the exit unit 162. Step surface 163 is a surface disposed between incident unit 161 and emission unit 162 on the front side of light flux controlling member 160 such that the front surface side of incident unit 161 is higher than the front surface side of emission unit 162. The shape of the step surface 163 is not particularly limited. Examples of the shape of the step surface 163 include a flat surface and a curved surface. In the present embodiment, the step surface 163 includes: a first step surface 163a which is a part of the inner surface of the recess where the first optical control section 176 is disposed; and a second step surface 163b which is a part of a side surface of the recess where the second optical control unit 179 to be described later is disposed. In the present embodiment, the first step surface 163a is a flat surface. In the present embodiment, the second stepped surface 163b has an arc shape in a plan view, and the cross-sectional shape including the optical axis LA of the light-emitting element 150 also has an arc shape.
Stepped surface 163 causes part of the light incident from first incident surface 171 and reflected by first reflecting surface 172 to exit to the outside of light flux controlling member 160. The distances from the light emitting element 150 to the light emitting unit 162 having the first optical control section 176 and the light emitting unit 162 having the second optical control section 179 are different from each other. Accordingly, since the optical paths of the light to be emitted are different from each other, the first step surface 163a and the second step surface 163b are preferably different in shape as shown in the present embodiment.
As described above, the plurality of exit units 162 includes four first exit units 164 and one second exit unit 165.
The first emission unit 164 includes a light direction changing part 175, a first optical control part 176, and a second side surface 177.
Beam direction changing unit 175 is disposed on the rear surface side of light flux controlling member 160. The light beam direction changing unit 175 changes the traveling direction of the light beam that has reached. The shape of the light beam direction changing portion 175 is not particularly limited as long as the above-described function can be exerted. In the present embodiment, light beam direction changing unit 175 has a shape of an inner surface of a recess having a rectangular (rectangular) shape in a plan view formed on the back surface side of light flux controlling member 160. In the present embodiment, the light beam direction changing portion 175 is formed of four planes. More specifically, the light direction changing part 175 includes: two first changing surfaces 175a arranged at positions corresponding to the short sides of the rectangle; second changing surface 175b disposed at a position corresponding to the long side of the rectangle and closer to the center of light flux controlling member 160; and third changing surface 175c disposed at a position corresponding to the long side of the rectangle and closer to the outer edge of light flux controlling member 160. The first modified surface 175a has a triangular shape, and the second modified surface 175b and the third modified surface 175c have a trapezoidal shape.
First optical control unit 176 is disposed on the front surface side of light flux controlling member 160. First optical control unit 176 causes the light emitted from light emitting element 150 to enter light flux controlling member 160 and then to be emitted once again to enter light flux controlling member 160, and causes the light traveling inside light flux controlling member 160 to be emitted to the outside. The shape of the first optical control section 176 is not particularly limited as long as the above-described function can be exerted. In the present embodiment, first optical control unit 176 is a part of the inner surface of a recess having a rectangular (oblong) shape in plan view formed on the front surface side of light flux controlling member 160. The first optical control portion 176 includes two inclined surfaces 176a and one connection surface 176 b.
Inclined surface 176a allows a part of the light emitted from first step surface 163a to enter light flux controlling member 160 again. Inclined surface 176a is arranged in a direction along the surface on the front surface side of light flux controlling member 160 so as to approach the front surface side of light flux controlling member 160 as it is farther from incidence unit 161. Connection surface 176b is a surface that connects two inclined surfaces 176a and is parallel to the surface on the front side of light flux controlling member 160.
Second side surface 177 is disposed outside light flux controlling member 160 with respect to light beam direction changing unit 175 and first optical controlling unit 176. Second side 177 is a portion of a side of beam control member 160. In the present embodiment, second side surface 177 is a portion of the side surface of light flux controlling member 160 corresponding to the side of the virtual quadrangle in a plan view of light flux controlling member 160, and is formed linearly. Second side surface 177 is disposed so as to be located on the same straight line as straight line portion 173b of first side surface 173 in a plan view of light flux controlling member 160.
The second emission unit 165 includes a second reflection surface 178 and a second optical control portion 179.
Second reflecting surface 178 is disposed on the rear surface side of light flux controlling member 160. The second reflecting surface 178 reflects the light internally reflected by the first reflecting surface 172. In the present embodiment, second reflecting surface 178 is connected to the rear surface side of light flux controlling member 160, and is formed so as to be positioned on the same plane as the rear surface side.
The second optical control unit 179 is disposed on the front surface side of the light flux controlling member 160. Second optical control unit 179 allows light emitted from second stepped surface 163b to enter again, or allows light traveling inside light flux controlling member 160 to exit to the outside. The shape of the second optical control unit 179 is not particularly limited as long as the above-described function can be exerted. In the present embodiment, second optical control unit 179 is a part of the inner surface of a recess formed on the front surface side of light flux controlling member 160. The planar shape of the recess is not particularly limited. In the present embodiment, the recessed portion has a substantially square shape in plan view, the four corners of which are cut away so as to be recessed toward the center side thereof.
The second optical control unit 179 has a bottom surface 179 a. Bottom surface 179a is a bottom surface of the recess, and causes the light emitted from second step surface 163b to enter the inside of light flux controlling member 160 again, and causes the light traveling inside light flux controlling member 160 to be emitted to the outside.
Here, a relationship between the distance between the optical axis LA of the light emitting element 150 and the second step surface 163b and the luminance distribution will be described. Fig. 7A and 7B are diagrams for explaining the relationship between the distance between the optical axis LA of the light emitting element 150 and the second step surface 163B, and the luminance distribution. Fig. 7A is a plan view of light flux controlling member 160 in which distances between optical axis LA of light emitting element 150 and second step surface 163B are different from each other, and fig. 7B shows luminance distributions of light flux controlling member 160 in which distances between optical axis LA of light emitting element 150 and second step surface 163B are different from each other. Note that the structure of the injection unit 162 is omitted in fig. 7A. Solid lines and broken lines of fig. 7A respectively indicate the second step surfaces 163 b. The solid line of fig. 7B represents the result of light emitting device 120 using light flux controlling member 160 having second step surface 163B closer to optical axis LA of light emitting element 150; the dotted line indicates the result of light emitting device 120 using light flux controlling member 160 having second step surface 163b distant from optical axis LA of light emitting element 150.
As described above, in the present embodiment, the optical axis LA of the light emitting element 150, the first axis a1 of the first incident surface 171, and the second axis a2 of the first reflecting surface 172 overlap. As shown in fig. 7A and 7B, it is understood that the light emitting device 120 using the light flux controlling member 160 having the second step surface 163B distant from the optical axis LA of the light emitting element 150 (the first axis a1 of the first incident surface 171 and the second axis a2 of the first reflecting surface 172) has higher luminance at the center portion of the light flux controlling member 160 (the light emitting device 120) than the light emitting device 120 using the light flux controlling member 160 having the second step surface 163B close to the optical axis LA of the light emitting element 150 (the first axis a1 of the first incident surface 171 and the second axis a2 of the first reflecting surface 172).
Next, a relationship among the first reflecting surface 172, the stepped surface 163 (the first stepped surface 163a and the second stepped surface 163b), and the first side surface 173 (the arc-shaped portion 173a and the straight portion 173b) will be described. Fig. 8 is a diagram for explaining a relationship among the first reflecting surface 172, the step surface 163, and the first side surface 173. As shown in fig. 8, in incident unit 161 including a part of the side surface of light flux controlling member 160 in a plan view of light flux controlling member 160, interval La between the center of first reflecting surface 172 (second axis a2) and any first point P1 on the front surface side edge of step surface 163 is longer than interval Lb between the center of first reflecting surface 172 (second axis a2) and second point P2, and second point P2 is a point on the front surface side edge of first side surface 173 of light flux controlling member 160 on the opposite side of first point P1 from the center of first reflecting surface 172 (second axis a 2). Thereby, a part of the light emitted from the light emitting element 150 is emitted from the second side surface 177. Here, the above-described relationship does not change regardless of whether first side surface 173 is arc-shaped portion 173a or linear portion 173b in a plan view of light flux controlling member 160.
(Effect)
As described above, in the present invention, since the distance between the center of first reflecting surface 172 (second axis a2) and step surface 163 is longer than the distance between the center of first reflecting surface 172 (second axis a2) and first side surface 173, the position corresponding to the center of light flux controlling member 160 is brightened by the light emitted from light emitting element 150.
[ embodiment 2]
Next, the surface light source device of embodiment 2 will be explained. The surface light source device of embodiment 2 differs from the surface light source device 100 of embodiment 1 only in the light flux controlling member 260, and therefore the configuration of the light flux controlling member 260 will be mainly described here. Note that the same components as those of light flux controlling member 160 in embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.
(Structure of light flux controlling Member)
Fig. 9 is a diagram showing a structure of a light flux controlling member according to embodiment 2.
As shown in fig. 9, light flux controlling member 260 has a plurality of incident units 161 and a plurality of exit units 262. The exit unit 262 includes four first exit units 264 and one second exit unit 165.
The first emission unit 264 includes a light beam direction changing portion 175 (see fig. 5B), a second optical control portion 179, and a second side surface 277. The second side surface 277 is disposed between the two first side surfaces 173 (the linear portions 173 b). In the present embodiment, second side surface 277 is linear when light flux controlling member 260 is viewed in plan. In addition, in two incidence units 161 including a part of the side surfaces (first side surfaces 173) and adjacent to each other and first emission unit 264 including a part of the side surfaces (second side surfaces 277) arranged between the two incidence units 161, the part of the side surfaces (second side surfaces 277) in first emission unit 264 is arranged closer to the center side of light flux controlling member 260 than the straight line connecting the parts of the side surfaces (straight line portions 173b of first side surfaces 173) of the two incidence units 161 located on the same plane.
(light path diagram)
Here, the optical path in the light emitting device 120 according to embodiment 1 of the present invention and the optical path in the light emitting device according to embodiment 2 of the present invention are compared.
Fig. 10A to 10F are optical path diagrams in light-emitting device 120 according to embodiment 1 of the present invention. As described above, light flux controlling member 160 of embodiment 1 has 4 incidence units 161. The light paths of the light emitted from the light emitting elements 150 and incident from the four incident units 161 are the same. Here, only light emitted from the lower right light-emitting element 150 in the light-emitting device 120 shown in fig. 10A to 10F will be described. More specifically, the light emitted from the lower right light-emitting element 150 and directed toward the upper right light-emitting element 150 in a plan view of the light-emitting device 120 is set to 0 degree, and the angle is increased by 10 degrees (0 degree, 10 degrees, 20 degrees, 30 degrees, 40 degrees, 50 degrees) in the clockwise direction (planar direction). In addition, in the side view of the light emitting device 120, the light emitted from the lower right light emitting element 150 and directed toward the upper right light emitting element 150 is set to 0 degree, and the angle is increased by 10 degrees (0 degree, 10 degrees, 20 degrees, 30 degrees, 40 degrees, 50 degrees, 60 degrees, 70 degrees, 80 degrees, and 90 degrees) counterclockwise (height direction).
Fig. 10A shows the results when the angle in the plane direction is 0 degree and the angle in the height direction is 0 to 90 degrees, fig. 10B shows the results when the angle in the plane direction is 10 degrees and the angle in the height direction is 0 to 90 degrees, fig. 10C shows the results when the angle in the plane direction is 20 degrees and the angle in the height direction is 0 to 90 degrees, fig. 10D shows the results when the angle in the plane direction is 30 degrees and the angle in the height direction is 0 to 90 degrees, fig. 10E shows the results when the angle in the plane direction is 40 degrees and the angle in the height direction is 0 to 90 degrees, and fig. 10F shows the results when the angle in the plane direction is 50 degrees and the angle in the height direction is 0 to 90 degrees.
Fig. 11A to 11C are optical path diagrams in the light-emitting device according to embodiment 2 of the present invention. Fig. 11A to 11C correspond to fig. 10D to 10F, respectively. Fig. 11A shows the results when the angle in the planar direction is 30 degrees and the angle in the height direction is 0 to 90 degrees, fig. 11B shows the results when the angle in the planar direction is 40 degrees and the angle in the height direction is 0 to 90 degrees, and fig. 11C shows the results when the angle in the planar direction is 50 degrees and the angle in the height direction is 0 to 90 degrees.
Fig. 12 shows a luminance distribution of the light-emitting device 120 in embodiment 1 and a luminance distribution of the light-emitting device in embodiment 2. The solid line in fig. 12 represents the luminance distribution of the light-emitting device 120 in embodiment 1, and the broken line in fig. 12 represents the luminance distribution of the light-emitting device in embodiment 2. Fig. 12 shows a luminance distribution in a cross section of a-a line shown in fig. 10A and a luminance distribution in a cross section of a-a line shown in fig. 11A. In fig. 12, the horizontal axis represents the distance from the center of light flux controlling member 160 or 260, and the vertical axis represents the luminance.
As shown in fig. 10A to 10F, it is understood that part of the light emitted from the light emitting element 150 is incident from the first incident surface 171; the light reflected by the first reflecting surface 172 is also emitted from the second side surface 177 disposed between the incident units 161. Thus, light is also emitted from between the incident units 161 (the second side surface 177 of the emission unit 162), and thus light can be uniformly emitted from the light-emitting device 120. It is understood that light having angles of 0 degrees, 10 degrees, and 20 degrees in the planar direction is emitted from between the incident units 161 (the side surfaces of the emission unit 162) more than light having angles of 30 degrees, 40 degrees, and 50 degrees in the planar direction.
As shown in fig. 10D to 10F and fig. 11A to 11C, it is understood that light having an angle of 30 degrees to 50 degrees in the planar direction in the light-emitting device of the present embodiment is emitted from the second side surface 277 to the outside more than light having an angle of 30 degrees to 50 degrees in the planar direction in the light-emitting device 120 of embodiment 1 (fig. 10D to 10F).
As shown by the area surrounded by the one-dot chain line in fig. 12, it is understood that the light emitting device of the present embodiment emits more light from the second side surface 277 than the light emitting device 120 of embodiment 1.
(Effect)
As described above, in the present invention, second side surface 277 is positioned closer to the center of light flux controlling member 160 than first side surface 173, and therefore, a large amount of light emitted from light emitting element 150 is also emitted from second side surface 177 of emission unit 162. In this way, light is also emitted from the region between the two incident units 161, and therefore, light can be uniformly irradiated without generating a dark portion.
Industrial applicability
The light flux controlling member, the light emitting device, and the surface light source device of the present invention can be applied to, for example, a backlight of a liquid crystal display device, a general lighting, and the like.

Claims (6)

1. A light flux controlling member for controlling distribution of light emitted from a plurality of light emitting elements arranged on a substrate, comprising:
a plurality of light emitting elements that emit light, respectively, and that emit light;
a plurality of emission units arranged between the plurality of incidence units in a direction along the surface of the substrate, and configured to guide and emit light incident from the plurality of incidence units; and
a step surface disposed between the incident unit and the emission unit on the front side of the light flux controlling member so that a surface on the front side of the incident unit is higher than a surface on the front side of the emission unit,
the incident unit has:
an incident surface disposed on a rear surface side of the light flux controlling member, the incident surface being configured to allow light emitted from the corresponding light emitting element to enter; and
a reflecting surface disposed on the front surface side of the light flux controlling member with the incident surface interposed therebetween, for reflecting light incident from the incident surface in a lateral direction,
in the incident means including a part of the side surface of the light flux controlling member, when the light flux controlling member is viewed in a plan view, an interval between a center of the reflecting surface and a first point, which is an arbitrary point on an edge on the front surface side of the stepped surface, is longer than an interval between the center of the reflecting surface and a second point, which is a point on the edge on the front surface side of the side surface of the light flux controlling member and is located on the opposite side of the first point with respect to the center of the reflecting surface.
2. The light beam steering section of claim 1,
a part of the light incident from the incident surface and reflected by the reflecting surface is emitted from the step surface to the outside of the light flux controlling member.
3. The light beam control section according to claim 1 or 2,
in the two incident units adjacent to each other including a part of the side surface and the emission unit including a part of the side surface arranged between the two incident units, the part of the side surface in the emission unit is arranged closer to the center of the light flux controlling member than the part of the side surface on the same plane as the two incident units.
4. A light-emitting device, comprising:
a plurality of light emitting elements disposed on the substrate; and
the light flux controlling member according to any one of claims 1 to 3, which is disposed on the plurality of light emitting elements.
5. A surface light source device, comprising:
a plurality of light emitting devices according to claim 4; and
and a light diffusion plate for diffusing and transmitting light emitted from the plurality of light emitting devices.
6. A display device, comprising:
the surface light source device of claim 5; and
and a display member to which the light emitted from the surface light source device is irradiated.
CN202210047307.1A 2021-01-20 2022-01-17 Light flux controlling member, light emitting device, surface light source device, and display device Pending CN114815382A (en)

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JP2021007335A JP2022111718A (en) 2021-01-20 2021-01-20 Luminous flux control member, light emitting device, surface light source device, and display device

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