WO2007105671A1 - 面光源装置 - Google Patents
面光源装置 Download PDFInfo
- Publication number
- WO2007105671A1 WO2007105671A1 PCT/JP2007/054783 JP2007054783W WO2007105671A1 WO 2007105671 A1 WO2007105671 A1 WO 2007105671A1 JP 2007054783 W JP2007054783 W JP 2007054783W WO 2007105671 A1 WO2007105671 A1 WO 2007105671A1
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- WO
- WIPO (PCT)
- Prior art keywords
- guide plate
- light guide
- light source
- light
- source device
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S4/00—Lighting devices or systems using a string or strip of light sources
- F21S4/20—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
- F21S4/28—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports rigid, e.g. LED bars
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/505—Wavelength conversion elements characterised by the shape, e.g. plate or foil
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/58—Optical field-shaping elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
- F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
- 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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0031—Reflecting element, sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—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]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
- H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- the present invention relates to a surface light source device, and more particularly to a surface light source device that obtains white light by mixing light from a plurality of LED chips that generate light of different wavelengths.
- a surface light source device using a light emitting diode (LED) is known as a surface light source device for a display panel such as a liquid crystal panel.
- LED light emitting diode
- RGB-LED surface light source device that uses a set of three types of LED chips that emit monochromatic light of red (R), green (G), and blue (B).
- RGB-LED surface light source device produces white light by mixing the monochromatic light emitted by three types of monochromatic LED chips that emit R, G, and B monochromatic light.
- RGB-LED surface light source devices produce white light by mixing three types of monochromatic light, in order to produce white light with no color unevenness, monochromatic light is mixed. Therefore, it is necessary to allow sufficient mixing distance. Therefore, in the RGB-LED surface light source device of the edge light method, the LED chip force that is the mixing distance is secured around the effective display area of the display (frame) in order to secure the distance to the part corresponding to the effective display area of the light guide plate. The width of becomes wide. In addition, in the direct-type RGB-LED surface light source device, the LED chip force, which is the mixing distance, also needs to secure a sufficient distance to the diffusion plate, which increases the thickness of the display.
- FIG. 23 is a longitudinal sectional view of a side end portion of such a surface light source device 200
- FIG. 24 is a sectional view taken along line XXI V-XXI V in FIG.
- the surface light source device 200 includes a substantially rectangular light guide plate 202, an elongated substrate 204 arranged along the side end surface 202a of the light guide plate 202, and the substrate 204.
- the LED light source 206 is arranged, and the light power emitted from the LED light source 206 is incident on the side end surface 202a of the light guide plate 202, and is emitted from the front surface (exit surface) 202b.
- the LED light source 206 is composed of a plurality of side-emitting red LEDs 206r, green LEDs 206g, and blue LEDs 206b arranged in a line. These single-color LEDs are arranged on the side end surface 202a of the light guide plate 202 at a predetermined pitch. Are arranged along.
- the surface light source device 200 includes a diffusion film 208 disposed on the front side of the light guide plate 202, a prism sheet 210 disposed on the front side of the diffusion film 208, and a back surface side of the light guide plate 202. And a diffusive reflector 212 arranged.
- White dot printing 214 is applied to the back surface of the light guide plate 202, and heat radiation fins 216 are attached to the back surface of the substrate 204 via a heat radiation sheet.
- the surface light source device 200 has a position opposite to the light guide plate 202 across the LED light source 206.
- a reflector 218 disposed in front of the LED light source 206.
- each single color LED 206r of the LED light source 206 is formed from the surface light source device 200 having such a configuration.
- the monochromatic light emitted from 206g and 206b all around in the horizontal direction is reflected directly or by the reflector 218 and enters the side end face 202a of the light guide plate 202.
- the monochromatic light emitted from the monochromatic LEDs 206r, 206g, and 206b in the lateral direction of the entire circumferential direction is incident on the adjacent monochromatic LEDs 206r, 20 before entering the light guide plate 202.
- FIG. 25 is a longitudinal sectional view of a side end portion of a surface light source device 300 having a similar structure
- FIG. 20 is a sectional view taken along line XXVI-XXVI in FIG.
- the surface light source device 300 includes single-color LEDs 206r, 2 constituting the LED light source 206 in a plurality of through holes 304 provided in a row at one end of the light guide plate 302.
- each single-color LED 206r, 206g, 206b emits light all around in the lateral direction, so that the single-color light emitted from each single-color LED 206r, 206g, 206b enters the light guide plate 302. Before mixing, it is mixed to some extent with the monochromatic light emitted from the adjacent monochromatic LEDs 206r, 206g, 206b.
- the present invention has been made based on the surface light source device having such a configuration. Disclosure of the invention
- the surface light source device 200 when the size of a display device such as a display is increased, a predetermined distance from the center of the single color LED is obtained due to the relationship between the arrangement pitch of the single color LEDs and the dimensions of the light guide plate 202. In such areas, mixing of monochromatic light becomes insufficient, and in those areas, there is a problem that color bands appear and it becomes impossible to obtain uniform white light.
- this surface light source device 200 a large amount of light emitted in the opposite direction to the light guide plate 202 in the monochromatic LED force is reflected and attenuated many times by the lens surface of the monochromatic LED and the reflector 218. There is.
- the adjacent monochromatic LEDs 206r, g, b are mixed in the light emitting forward direction and the oblique direction, the monochromatic light is incident on the side end face 202a of the light guide plate 202 and generates a color band. There is also a problem that unevenness is likely to occur.
- the surface light source device 300 if the size of a display device such as a display is increased, the mixing of each monochromatic light is insufficient in the region of a predetermined distance of the central force of each monochromatic LED. There is a problem that a color band appears in the region and it is impossible to obtain a uniform white light.
- the present invention has been made to solve such a problem, and can obtain white light without color unevenness without increasing the thickness or widening the width of the frame.
- An object of the present invention is to provide a surface light source device.
- the light guide plate having a plurality of through-holes and the plurality of LED chips that are sealed with a resin and generate light having different wavelengths are provided.
- a surface light source device comprising: an LED module arranged to emit light radially in the through hole in the vicinity of the opening end opposite to the light exit surface of the light plate It is done.
- an LED chip (monochromatic LED) that is sealed by a resin and generates light of different wavelengths emits light of a predetermined wavelength through the sealing resin into the through hole. .
- the light of each wavelength emitted from the monochromatic LED chip is mixed in the sealing resin.
- the light emitted from the ED module is mixed at a short distance, and white light with uniform color is obtained, realizing a high-quality large surface light source device.
- the through holes of the light guide plate are arranged in a plurality of rows.
- the LED module in which the LED chips are arranged can be easily downsized and mass-produced.
- the through holes are arranged in one or two rows along a side end surface of the light guide plate.
- the LED chip can be arranged compactly on the substrate. it can. Therefore, the LED module can be easily downsized, and its assembly and mass production can be facilitated.
- the resin sealing the LED chip includes a diffusing agent.
- the mixing of monochromatic light within the resin in which the LED chip is sealed is promoted, so that more uniform white light can be obtained.
- a display with less color unevenness that is difficult to observe monochromatic light around the through hole is obtained.
- the light of the LED chip force is diffused by the diffusing agent and is incident on the light guide plate, so that the light having a small incident angle on the light guide plate is increased and the luminance on the exit surface of the light guide plate is increased.
- the light guide plate is formed of a resin containing a diffusing agent. It is.
- the light incident on the light guide plate can be efficiently emitted from the light guide plate emission surface, and a high-luminance surface light source device with excellent in-plane luminance uniformity can be obtained.
- a reflector is further provided so as to cover the opening end of the through hole on the emission surface side.
- the reflector is a reflector that diffusely reflects incident light.
- the light control plate is provided so as to cover the opening end of the through hole on the emission surface side.
- the light control plate since the light control plate is disposed, most of the light to be emitted from the opening on the emission surface side of the through hole out of the monochromatic light emitted from the LED chip is reflected. It is possible to control to radiate and transmit most of the light of the light guide plate force. As a result, the LED module can also be arranged in the center of the light guide plate, so that the surface light source device can be enlarged while realizing uniform white light.
- the LED module is disposed in a recess formed on a substrate.
- the LED modules are arranged on the substrate, it is possible to simultaneously cool a plurality of LED modules by attaching a heat dissipation structure to the substrate.
- a refractive index is formed in the through-hole with a grease substantially equal to a refractive index of the light guide plate, and the concave surface is directed toward the exit surface of the light guide plate.
- a formed resin layer is provided.
- the surface light source device includes a reflector that covers the opening of the through hole, the light that is not reflected by the concave portion is reflected by the reflector and travels from the concave portion into the light guide plate.
- the surface light source device includes a light control plate
- the light that is not reflected by the concave portion is controlled by the light control plate for the amount of light transmitted and reflected, and the reflected light passes from the through hole to the inside of the light guide plate.
- the transmitted light is emitted to the outside of the light guide plate.
- the light of the LED module can be guided to the light guide plate more efficiently, and the monochromatic light can be mixed efficiently.
- the LED module force is arranged so as not to overlap each other on both surfaces of the light guide plate.
- the LED modules are arranged on both surfaces of the light guide plate, it is possible to efficiently dissipate heat from the LED chip by taking a larger pitch with the adjacent LED modules, and the heat dissipation structure is improved. Simplified.
- a surface light source device of the present invention capable of obtaining white light without color unevenness without increasing the thickness or widening the width of the frame.
- FIG. Fig. 1 is an enlarged vertical sectional view showing the vicinity of the end of the surface light source device 1
- Fig. 2 is a cross-sectional view of Fig. 1. It is sectional drawing along a line.
- the surface light source device 1 includes a light guide plate 2 that is a plate body formed of a transparent material.
- a plurality of through holes 4 penetrating the light guide plate 2 in the thickness direction are formed in a line at a predetermined pitch along the side edge at one side end of the light guide plate 2.
- the light guide plate 2 is formed of a transparent resin such as polymethylmetatalylate resin (PMMA), and the side end surface on the side where the through hole 4 is provided (end surface on the light source side).
- PMMA polymethylmetatalylate resin
- the resin constituting the light guide plate 2 is not limited to polystyrene resin (PSt), polycarbonate resin (PC), methacrylic styrene resin (MS), cyclic polyolefin resin (COP), etc. You can use
- An elongated substrate 6 is attached to the back surface 2b, which is the surface opposite to the light exit surface (front surface) 2a, of the light guide plate 2 along the through holes 4 arranged in a row.
- LED modules 12 in which the LED chip group 8 is sealed with a sealing resin 10 are respectively attached.
- the LED chip group 8 includes three types of top-emitting type single color LEDs, namely, a red LED chip (emission center wavelength: 625 nm) 8r, a green LED chip (emission center wavelength: 525 nm) 8 g, and a blue LED chip ( (Emission center wavelength: 460 nm) 8b is included.
- the LED chip group 8 includes one red LED chip 8r, two green LED chips 8g, and one blue LED chip 8b.
- Each single-color LED chip 8r, 8g, 8b is a large current drive type of 0.55mm square and is driven with a current of about 70mA.
- the substrate 6 has a size of about 310 (L) X 10 (W) X 2 (t) mm and has excellent heat dissipation because it efficiently dissipates the heat generated by the LED chip group 8. It is made of aluminum material.
- a silicone resin having a refractive index of 1.41 is used as the sealing resin 10.
- a jig in which approximately 2.5 mm holes surrounding each LED chip group 8 are provided at a pitch of 10 mm is brought into close contact with the front surface of the substrate 6.
- sealing resin 10 is injected into the holes of the jig and sealed. ⁇ Fat 10 is cured and each single-color LED chip 8r, 8g, 8b is sealed.
- the diameter of the through hole 4 is set to be approximately equal to the diameter of the LED module 12.
- the through holes 4 are circular holes having a diameter of 2.8 mm, and 31 pieces are arranged in a row at one pitch along the one side end (light source side end) of the light guide plate 2 at a pitch of 10 mm. Has been. Therefore, in this embodiment, 31 sets of LED modules 12 are also arranged in a row on the substrate 6 at a pitch of 10 mm. Further, the distance between the light source side end face of the light guide plate 2 and the center of the through hole 4 is set to 2.5 mm.
- each LED module 12 is arranged in the vicinity of the opening end of the through hole 4 on the side 2b opposite to the exit surface of the light guide plate 2 and emits light radially into the through hole 4. Will be emitted.
- the light emitted into the through hole 4 enters the light guide plate 2 and propagates through the inside, and finally exits from the exit surface 2a.
- the surface light source device 1 of the present embodiment includes a diffusion film 14 that is disposed in front of the emission surface 2a of the light guide plate 2 and diffuses and deflects the light emitted from the light guide plate 2, and the front of the diffusion film 14 And two prism sheets 16 and 18 for deflecting light in a substantially normal direction, and a diffusion film 20 disposed further in front of the prism sheets 16 and 18.
- the prism sheets 16 and 18 are formed on the front surface (surface opposite to the light guide plate 2) by arranging elongated prisms having an isosceles triangular cross section with an apex angle of 85-: LO 0 ° arranged without gaps.
- the diffuser film is configured to deflect light of 14 powers in the normal direction (upward in Fig. 1).
- the prism sheets 16 and 18 have prism directions orthogonal to each other.
- the diffusion film 20 is disposed in order to achieve brightness uniformity.
- the surface light source device 1 includes a diffuse reflection plate 22 disposed on the back surface 2b side of the light guide plate 2.
- This diffuse reflection plate 22 is a rectangular thin sheet-like member arranged almost in parallel with the light guide plate 2, and out of the light emitted from each LED module 12, the light emitted from the back surface 2b of the light guide plate 2 is used. It is configured to diffuse and reflect.
- the surface light source device 1 includes a reflector 24 that covers a side end portion of the light guide plate 2 where the through hole 4 is provided.
- the reflector 24 includes an opening on the exit surface side of the through hole 4 of the light guide plate 2 and its peripheral region, a peripheral region of the through hole 4 on the back side of the light guide plate 2, and the light guide plate 2 It covers the side end face 2c.
- the reflector 24 is White diffuse reflection film such as foam PET is used.
- heat radiation fins 26 are attached to the back surface of the substrate 6 via heat radiation sheets (not shown) so that heat transferred from the LED module 12 to the substrate 6 can be efficiently released. ing.
- white dot printing 28 is applied to the back surface 2b of the light guide plate 2.
- the dot print 28 diffuses and reflects light that has reached the back surface of the light guide plate 2, and emits light from the light guide plate 2.
- the density is varied in-plane so that the amount of light emitted from 2a is uniform.
- the red, green, and blue monochromatic light emitted from the monochromatic LEDs 8r, 8g, and 8b constituting each LED chip group 8 is mixed to some extent within the sealing resin 10, and then into the through hole 4 from the LED module 12. And are further mixed when passing through the through-hole 4.
- the light entering the light guide plate 2 from the inner peripheral surface of the through-hole 4 is refracted at the inner peripheral surface of the through-hole 4 and is incident at an angle of incidence. It propagates through the light guide plate 2 at an angle that is closer to parallel to the surface 2a of the light guide plate 2. These lights are mixed with each other while propagating in the light guide plate 2.
- the white light is sequentially emitted from the light guide plate 2 through the emission surface 2a. The direction of deflection of the light emitted through the emission surface is adjusted by the diffusion film 14, the prism sheets 16 and 18, and the diffusion film 20.
- the light incident on the light guide plate 2 is deflected by the wedge shape of the light guide plate 2 and the action of the dot printing 28, and the component exceeding the critical angle of the output surface 2a passes through the output surface 2a of the light guide plate 2.
- the light is emitted from the light guide plate 2.
- each single color LED chip 8r, 8g, 8b is sealed with the sealing resin 10.
- Fat 10 mixes monochromatic light
- the mixing distance required outside the LED module 12 can be shortened. Therefore, it is possible to obtain a surface light source device that generates a uniform white color with no color unevenness without increasing the size.
- the light from each LED module 12 can be well mixed without color unevenness, so a uniform white color can be realized.
- the LED module 12 emits light into the through-hole 4, it is mixed in the through-hole 4, so that a more uniform white light can be obtained.
- the reflector 24 covers the opening on the exit surface side of the through hole 4, the light emitted from the LED module 12 in the direction of the exit surface is reflected by the reflector 24 and returned to the through hole 4. Therefore, the light emitted from the LED module 12 can be efficiently incident on the light guide plate 2, and the luminance of the surface light source device 1 can be improved.
- the handling of the LED modules 12 is facilitated. Further, since the LED module 12 is preliminarily positioned on the substrate 6, the LED module 12 can be easily assembled and the surface light source device 1 can be easily manufactured.
- FIG. 3 is an enlarged longitudinal sectional view showing the vicinity of the end of the surface light source device 30, and FIG. 4 is a sectional view taken along line IV-IV in FIG.
- the surface light source device 30 is substantially the same as the surface light source device 1 of the first embodiment except that the configuration of the monochromatic LED included in the LED chip group and the structure of the substrate on which the LED module is mounted are different. With configuration! /
- the LED chip group 32 of the surface light source device 30 includes one red LED chip 32r, one green LED chip 32g, and one blue LED chip 32b!
- each single color LED chip 32r, 32g, 32b has a different size.
- the drive current is only a guideline. In practice, the drive current is appropriately controlled by a sensor and a controller in order to achieve a good white color.
- the LED chip group 32 is mounted on the bottom surface of each of the plurality of recesses 34 a linearly arranged on the substrate 34.
- the recess 34a has a truncated conical cross-sectional shape that expands upward (front side) and has a side wall surface as a reflecting surface.
- the size of the recess 34a is set such that the opening diameter is 3.5 mm, the bottom diameter is 2.5 mm, and the depth is 0.5 mm.
- the substrate 34 has a dimension of about 310 (L) X 10 (W) X 2 (t) mm, and it efficiently dissipates the heat generated by the LED chip group 32.
- This substrate 34 is created by applying an insulating layer on the surface of an aluminum base material, pasting a conductor such as copper foil on it, and processing this conductor into an electrode 'wiring by a photolithographic process.
- a recess 34a is formed by embossing.
- the electrode wiring portion is plated with silver or the like having a high reflectance, and the LED chip group 32 is fixed and connected to the electrode on the substrate 34 by a bonding wire.
- a sealing resin 36 is injected into the recess 34a to seal the LED chip group 32, and the LED module 38 is obtained.
- the sealing resin 36 a sealing resin in which silica spherical particles having an average particle diameter of 2 ⁇ are dispersed substantially uniformly at 10 wt% is used. Since the silica itself is transparent and the average particle size is about 2, light from the LED chip group 32 can be diffused without loss and without color. In addition, since the silica particle diameter is about 2, the sealing resin 36 can be easily filled in the region where the sealing resin 36 flows easily and is desired to be sealed. Furthermore, since silica is thermally very stable, the durability of the surface light source device 30 is not deteriorated by the silica particles.
- silica particles treated with ferrosilan or bubbles of several lOOnm to several orders may be used as a diffusing agent to be contained in the sealing resin 36. By doing so, the light power emitted from the LED module 38 is diffused in all directions, and the light guide plate 2 The light that is directly incident on increases.
- Twenty sets of LED modules 38 are formed on the substrate 34 at a pitch of about 15.5 mm.
- the content of the diffusing agent may be adjusted according to the refractive index difference between the refractive index of the resin constituting the sealing resin 36 and the refractive index of the diffusing agent.
- the range of 0.1 to 30% by mass with respect to fat 36 is preferred. If the difference in refractive index between the diffusing agent and the sealing resin 36 is small, it is necessary to contain a large amount of diffusing agent. If the difference in the refractive index between the diffusing agent and the sealing resin 36 is large, The effect can be confirmed with a small amount of the diffusing agent added.
- the light guide plate 2 is formed of a transparent resin such as polymethylmetatalylate resin (PMMA), and the side end surface on the side where the through-hole 4 is provided (light source side end surface).
- PMMA polymethylmetatalylate resin
- the through hole 4 is set to be approximately equal to the diameter of the LED module 38 !.
- the through holes 4 are circular holes having a diameter of 3.8 mm, and are arranged at one end (light source side end) of the light guide plate 2 at a pitch of about 15.5 mm, corresponding to the LED module 38.
- the distance between the side end surface of the light guide plate 2 (light source side end surface) and the center of the through hole 4 is 3.5 mm.
- the LED module 38 is formed in the recess 34a of the substrate 34, a jig for injecting the sealing resin as in the first embodiment is not necessary, and the manufacture of the LED module 38 is facilitated.
- the LED module 38 is formed in the recess 34a, the monochromatic LED chips 32r, 32g, and 32b can be easily positioned.
- the encapsulating resin 36 contains a diffusing agent, the monochromatic light emitted from the LED chip group 32 is more diffused in the encapsulating resin 36 and the monochromatic light is mixed more efficiently. Color unevenness can be further reduced.
- FIG. 5 is an enlarged longitudinal sectional view showing the vicinity of the end of the surface light source device 40
- FIG. 6 is a sectional view taken along the line VI-VI in FIG.
- the surface light source device 40 has substantially the same configuration as the surface light source device 30 of the second embodiment, except for the structure of the light guide plate 2 itself and the optical system provided on the front surface thereof.
- the surface light source device 40 provides light emitted from the light guide plate 42 provided on the front surface (output surface) side of the light guide plate 42.
- a prism sheet 44 that deflects in a substantially normal direction, and a diffusion film 46 that is disposed on the front side of the prism sheet 44 and prevents viewing angle adjustment and glare.
- the emission surface 42a is covered by a mat surface having a fine uneven shape by mold transfer or the like, and the back surface 42b is processed into a prism surface.
- This prism extends in a direction perpendicular to the direction in which the through holes 4 are arranged. Further, in the first embodiment and the second embodiment, the dot printing provided on the back surface of the light guide plate is not provided in the surface light source device 40 of the present embodiment.
- the mat surface of the light guide plate 42 has an average inclination angle ⁇ a in the range of 1 to 5 degrees in order to achieve a luminance uniformity on the exit surface. If the average inclination angle ⁇ a of the mat surface is less than 1 degree, the amount of light emitted from the light guide plate 42 tends to be small and sufficient brightness cannot be obtained. If the average inclination angle ⁇ a is greater than 5 degrees, the vicinity of the end face This is because a large amount of light is emitted, and the attenuation of the emitted light in the light guide direction within the emission surface becomes significant, and the luminance uniformity on the emission surface tends to decrease.
- L is the measured length
- ⁇ a is the tangent of the average inclination angle ⁇ a.
- the arrangement of the through holes 4 is not limited. It may be a lens surface on which a large number of lens rows extending in parallel to the row direction are formed.
- the lens array to be formed include a prism array, a lenticular lens array, and a V-shaped groove.
- the average inclination angle ⁇ a of the light source side end face of the light guide plate 42 is about 1 °, and the average inclination angle ⁇ a is about 3 ° at the end face opposite to the light source side end face.
- the average inclination angle ⁇ a is gradually adjusted to be larger.
- the prism surface of the back surface 42b of the light guide plate 42 controls the directivity of the light emitted from the light guide plate 42 on the surface parallel to the arrangement direction of the through holes 4 and the apex angle thereof is 90 to 110.
- a range of ° is preferable. This is because by setting the apex angle within this range, the light emitted from the light guide plate 42 can be appropriately condensed, and the luminance of the planar light source device 40 can be improved.
- a force that uses the back surface 42b of the light guide plate 42 as a prism surface in which a large number of prism rows are formed. Is formed so as to extend perpendicular to the arrangement direction of the through holes 4.
- the prism surface may be formed such that the top or valley of the prism row or the like is flat or curved.
- the force that forms the exit surface 42a of the light guide plate 42 on the mat surface and the back surface 42b on the prism surface On the contrary, the exit surface 42a is the prism surface and the back surface 42b is the mat surface.
- the structure made into may be sufficient.
- the prism sheet 44 is formed by arranging a large number of elongate prisms having an isosceles triangular cross section having an apex angle of 60 to 75 ° having an apex on the light guide plate 42 side without gaps.
- the light from the light guide plate 42 is totally reflected by the inner surface of the prism and deflected in the normal direction.
- the surface light source device 40 the light power emitted from the LED module 38 and incident on the light guide plate 42 through the through hole 4 is reflected by the mat surface and the prism surface of the light guide plate 42, and the reflected Z transmission is controlled to make the luminance uniform. Is done. After that, the light is deflected in a substantially normal direction by the prism sheet 44, and the viewing angle is adjusted and glare is prevented by the diffusion film 46. Displayed as white on the surface side.
- the exit surface 42a of the light guide plate 42 is a mat surface
- the back surface 42b is a prism. Since it is formed into a plane, the light emitted from the light guide plate 42 can be diffused well and deflected in a predetermined direction. This eliminates the need for the diffusion film 14 of the surface light source device 1 of the first embodiment and reduces the number of prism sheets, thereby reducing the number of parts, simplifying the structure, and reducing the manufacturing cost. .
- FIG. 7 is an enlarged longitudinal sectional view showing the vicinity of the end of the surface light source device 50
- FIG. 8 is a sectional view taken along line VI II-VIII in FIG.
- the surface light source device 50 has substantially the same configuration as the surface light source device 30 of the second embodiment except for the arrangement of LED chips and the shape of the light guide plate.
- the LED module 52 of the surface light source device 50 of the fourth embodiment diffuses the LED chip group 56 arranged in the recess 54a of the substrate 54, as in the second embodiment.
- the structure is sealed with a sealing resin 36 containing an agent.
- the size of the recess 54a of the substrate 54 is 5.6 mm
- the bottom diameter is 4.8 mm
- the depth is 0.5 mm because many LED chips are mounted.
- the substrate 34 has a dimension of about 405 (L) X 1 O (W) X 2 (t) mm.
- the LED chip group 56 includes a plurality of single-color LED chips each emitting light having a different emission wavelength, that is, three red LED chips 56r and five green LED chips. 56g, composed of two blue LED chips 56b. Each single color LED chip 56r, 56g, 56b is the same size of 0.38mm square.
- a plurality of through holes 60 are arranged in rows on both sides of the light guide plate 58, and a substrate 54 in which an LED module 52 is provided on the back side of each through hole 60 row. Is installed.
- the LED modules 52 are arranged on a substrate 54 in one row and 26 pairs at a pitch of about 15.6 mm.
- the light guide plate 58 is formed of a transparent resin such as polymethyl metatalylate resin (PMMA) and has a thickness. It is a rectangular flat plate with a uniform length of 6 mm and a length and width of about 405 X 315 mm (19-inch size).
- PMMA polymethyl metatalylate resin
- the through-holes 60 are circular holes having a diameter of 6. Omm, and 26 pieces are arranged on both ends of the light guide plate 58 at intervals of about 15.6 mm corresponding to the LED modules 52.
- the distance between the side end surface of the light guide plate 58 and the center of the through hole 60 is 5.0 mm.
- the diffusion film of the surface light source device 1 of the first embodiment In the surface light source device 50 of the fourth embodiment, the diffusion film of the surface light source device 1 of the first embodiment.
- the prism sheet 18 is not provided, and only the prism sheet 16 is provided.
- the same effects as those of the second embodiment can be obtained, and the LED chip group 56 is configured by a relatively small size monochromatic LED chip. Therefore, at present, the chip area power, the luminous efficiency when the same power supply is high! From this, the luminous efficiency of the LED module 52 can be improved.
- the LED modules 52 are arranged at both ends of the light guide plate 58, more light can be incident on the light guide plate 58, and the luminance of the surface light source device 50 can be improved.
- FIG. 9 is an enlarged longitudinal sectional view showing the vicinity of the end of the surface light source device 62, and FIG.
- the surface light source device 62 also has an LED module 6 on the exit surface side of the light guide plate 64.
- the LED modules 66 are provided on both side ends of the light guide plate 64.
- the light guide plate 64 is disposed on both sides of the exit surface 64a side opening and the back surface 64b side opening of the through hole 68 of the light guide plate 64.
- the LED module 66a disposed on the exit surface 64a side of the through hole 68 of the light guide plate 64 and the LED module 66b disposed on the back surface 64b side are arranged in the vertical direction (front-rear direction, projecting from the light guide plate). Are not arranged in the same direction).
- the upper and lower LED modules 66a and 66b are formed in 13 sets in a row at a pitch of about 31.2 mm on the substrate 70, and the positions of one through hole 68 on the upper and lower surfaces of the light guide plate 64 The positions are shifted.
- the substrate 70 is connected to a highly heat-conducting casing 72 disposed so as to surround the side end portion of the light guide plate 64 so that the heat generated by the LED modules 66a and 66b can be released. It is configured.
- the substrate 70 is disposed so as to face the exit surface and the back surface of the light guide plate 64, so the opening on the side where the LED module 66 of the through hole 68 is not disposed is
- the substrate 70 is covered with the opposite substrate 70. Therefore, in the surface light source device 62, light that is going to be emitted from the opening on the opposite side of the through hole 68 is reflected by the substrate 70 that covers the opening, and the substrate 70 serves as a reflector.
- the surface light source device 62 is formed of a transparent resin such as polymethylmetatalylate resin (PMMA), has a uniform thickness of 6 mm, and has a rectangular shape with a length and width of about 405 X 315 mm (19-inch size). It is a flat body.
- PMMA polymethylmetatalylate resin
- the through holes 68 are circular holes with a diameter of 6. Omm, and 26 holes are arranged at a pitch of about 15.6 mm corresponding to the arrangement positions of the LED modules 66.
- the distance between the side end portion of the light guide plate 64 and the center of the through hole 68 is 5. Omm.
- the LED modules 66 are arranged on both the output surface and the back surface of the light guide plate 64, and the LED module. 66 are arranged so as to overlap each other in the vertical direction !. Therefore, the space between the adjacent LED modules 66 can be widened, and the heat radiation from the LED modules 66 can be effectively performed. As a result, it is possible to drive the LED module 66 with a large driving current and improve the luminance of the surface light source device 62.
- FIG. 11 is an enlarged longitudinal sectional view showing the vicinity of an end of the surface light source device 74
- FIG. Fig. 11 is a cross-sectional view taken along line ⁇ - ⁇ in Fig. 11.
- the surface light source device 74 of the present embodiment is substantially the same as the surface light source device 50 of the fourth embodiment, except that the end portion of the light guide plate 76 including the through hole 78 is inclined. Have a configuration.
- the side end portion of the emission surface 76a of the light guide plate 76 is obliquely downward (from the emission surface to the side end surface from the outer edge on the center side of the through hole 78.
- the inclined surface 80 is inclined toward the opposite surface.
- the inclination angle of the inclined surface 80 is about 40 ° with respect to the emission surface, and is inclined to the side end surface of the light guide plate 76 by force.
- the reflector 82 covering the end portion of the light guide plate 76 is also inclined and disposed along the inclined surface 80.
- 26 sets of LED modules 84 are formed on both sides of the light guide plate 76 in a line at a pitch of about 15.6 mm.
- the light guide plate 76 is formed of a transparent resin such as polymethylmetatalylate resin (PMMA), and is a rectangular plate having a uniform thickness of 6 mm and a length and width of about 405 X 310 mm (19 inch size). It is.
- PMMA polymethylmetatalylate resin
- Twenty-six through holes 78 are circular holes with a diameter of 6. Omm and are arranged at a pitch of about 15.6 mm, corresponding to the arrangement positions of the LED modules 84.
- the distance between the side end face of the light guide plate 76 and the center of the through hole 78 is 3.5 mm.
- the light emitted from the LED module 84 in the thickness direction of the light guide plate 76 is reflected by the reflector 82 disposed on the inclined surface 80 and is emitted from the light guide plate 76.
- the light can be incident on the incident end surface of the light guide plate 76 at an angle close to parallel to the surface, and the luminance of the surface light source device 74 can be improved.
- FIG. 13 is an enlarged longitudinal sectional view showing the vicinity of the end of the surface light source device 86.
- FIG. 14 is a cross-sectional view taken along line XIV-XIV in FIG.
- the arrangement position of the LED module 88 is different, and accordingly, the reflection / transmission control film 94 as the light control plate and the diffusion sheet 96 are the light guide plate 90. Except for the points arranged above, it is almost the same as the surface light source device 50 of the fourth embodiment. It has the composition of.
- a surface light source device 86 includes an LED module 88 having the same configuration as that of the second embodiment.
- the LED modules 88 are arranged corresponding to the through holes 92 formed in a row on the light guide plate 90, as in the other embodiments.
- the rows of through-holes 92 are arranged in a total of four rows at a predetermined interval (190 mm pitch in this embodiment) from a position 80 mm inward from the side end surface of the light guide plate 90. .
- LED modules 88 are arranged in a row at a pitch of about 15.6 mm corresponding to the through holes 92.
- the light guide plate 90 is formed of a transparent resin such as polymethylmetatalylate resin (PMMA), and is a rectangular plate having a uniform thickness of 4 mm and a length and width of about 405 mm X 730 mm.
- the dimension of the substrate 34 is about 405 (L) X 10 (W) X 2 (t) mm.
- the light guide plate 90 On the front surface (outgoing surface) of the light guide plate 90, the light that has passed through the through hole 92 and the through hole of the light guide plate 90 are provided.
- a diffusion sheet 96 is provided in front of the reflection / transmission control film 94 to diffuse and equalize the light emitted from the reflection / transmission control film 94 and to erase the image of the light source as much as possible. ing.
- a diffusion film 14 similar to that of the first embodiment and a prism sheet 16 for deflecting light emitted from the diffusion film 14 in a substantially normal direction are provided in front of the diffusion sheet 96.
- a reflector 98 is provided to cover the side end surface 90a of the light guide plate 90, and heat radiating fins 102 are attached to the back surface of the substrate 100 via a heat radiating sheet (not shown).
- the reflection / transmission control film 94 is a transparent film or a milky white transflective film that has been subjected to white printing.
- the white printing is the opening on the exit surface side of the through hole 92 and the periphery of the through hole 92. In the area, the area density of the white print gradually decreases as it moves away from the through-hole 92 where the area density of the white print is high.
- the reflection / transmission control film 94 can be disposed only above the through hole 92 of the light guide plate 90. [0109] In such a surface light source device 86, the white printing power of the reflection / transmission control film 94 is low on the light guide plate 90 or is not printed, so that the light is emitted from the light exit surface of the light guide plate 90. The light is almost transmitted through the reflection / transmission control film 94.
- the white printing of the reflection / transmission control film 94 has a high density at the opening of the through-hole 92, so that most of the light emitted from the opening of the through-hole 92 is diffusely reflected by the reflection / transmission control film 94. And enters the light guide plate 90.
- the reflection / transmission control film 94 is provided on the front surface of the light guide plate 90, most of the light from the light guide plate 90 is transmitted and at the same time from the through hole 92. A lot of light can be reflected. As a result, since the LED module can be arranged also in the central portion of the light guide plate 90, the surface light source device can be enlarged while realizing uniform white light.
- FIGS. 15 is a longitudinal sectional view of the surface light source device 104
- FIG. 16 is a sectional view taken along the line XVI-XVI of FIG.
- the surface light source device 104 of the present embodiment has a feature that a concave resin layer 110 formed in a concave shape is provided in the through-hole 108 of the light guide plate 106 and directed toward the emission surface of the light guide plate 106. Except
- the configuration is almost the same as that of the fourth embodiment.
- the surface light source device 104 is an LE having the same configuration as that of the second embodiment.
- a D module 112 is provided.
- the LED module 112 is disposed at both ends of the light guide plate 106 as in the fourth embodiment.
- the light guide plate 106 is formed of a transparent resin such as polymethylmetatalylate resin (PMMA), and is a rectangular plate having a uniform thickness of 4 mm and a length and width of approximately 405 X 310 mm (19-inch size). It is.
- PMMA polymethylmetatalylate resin
- the through hole 108 is a circular hole having a diameter of 6.0 mm, and 26 pieces are arranged at both end portions of the light guide plate 106 with about 15.6 mm pitch corresponding to each LED module 112. Further, the distance between the side end face of the light guide plate 106 and the center of the through hole 108 is 3.5 mm.
- the through hole 108 of the light guide plate 106 is made of a resin having a refractive index substantially equal to the refractive index of the light guide plate 106.
- the formed concave resin layer 110 is provided.
- the end of the concave resin layer 110 on the LED module 1 12 side (back side) blocks the opening of the through hole 108.
- the end on the exit surface 106a side is substantially parabolic or hemispherical toward the exit surface 106a. It is formed in a concave shape
- the concave resin layer 110 is formed by fixing the light guide plate 106 and the LED module 112, and then applying an acrylic ultraviolet curing resin having a refractive index adjusted to 1.50 along the wall surface of the through hole 108. It is formed by supplying and curing by ultraviolet irradiation.
- the concave resin layer 110 totally reflects part of the light incident from the lower surface (back side) on the inner surface of the concave portion, and enters the inside of the light guide plate 106. It plays the role of making progress. Further, the light that travels in the thickness direction of the light guide plate 106 and passes through the concave resin layer 110 passes through the through hole 1.
- the eighth embodiment most of the light emitted into the through-hole 108 is totally reflected by the concave portion of the concave resin layer 110, and efficiently incident on the light guide plate 106, and the surface light source The brightness of the device 104 can be improved.
- FIGS. 17 is an enlarged longitudinal sectional view showing the vicinity of the end of the surface light source device 116
- FIG. 18 is a sectional view taken along the line XVIII-XVIII in FIG.
- the surface light source device 116 of the present embodiment is the same as that of the seventh embodiment except that the arrangement positions of the LED modules are different and the structure of the substrate on which the LED modules are mounted is different. It has substantially the same configuration as the surface light source device 86.
- the surface light source device 116 includes an LED module 118 having the same LED chip group configuration as that of the second embodiment.
- the light guide plate 120 is formed of a transparent resin such as polymethylmetatalylate resin (PMMA), has a uniform thickness of 4 mm, and has a vertical and horizontal dimension of about 730 (L) X 405 ( W) mm rectangular plate.
- the through hole 122 of the light guide plate 120 is a circular hole having a diameter of 6. Omm, and extends inward from the long side end surface (730 mm end surface) of the light guide plate 120 at a position of 45 mm in the short side direction. They are arranged at a predetermined interval (45 mm interval in this embodiment).
- the through holes 122 are arranged at predetermined intervals (in this embodiment, 52 mm intervals) in the long side direction from a position 53 mm inward from the short side end surface (405 mm end surface) of the light guide plate 120. Accordingly, a total of 104 through-holes 122 are arranged in the plane of the light guide plate 120, 8 in the vertical direction and 13 in the horizontal direction.
- the substrate 126 is formed with substantially the same dimensions as the vertical and horizontal sizes of the light guide plate 120, and the dimension is approximately 730 (L) X 405 (W) X 2 (t) mm.
- a diffuse reflection layer 128 is provided on the front surface of the substrate 126.
- the diffuse reflection layer 128 is formed of a coating film or a thin sheet (or film) member. Of the light emitted from each LED module 118, the light emitted from the back surface 120b of the light guide plate 120 is used. It is configured to diffuse and reflect.
- a recess is formed at a position corresponding to the through hole 122.
- the LED module 118 is disposed in the recess. Therefore, the LED module 118 is arranged corresponding to the position of the through hole 122 formed in the light guide plate 120.
- the substrate 126 is formed of an aluminum material having excellent heat dissipation in order to efficiently dissipate the heat generated by the LED chip group 32. In the present embodiment, the substrate 126 itself has the role of a radiation fin that radiates heat of the LED module 118 force.
- the front surface (outgoing surface) of the light guide plate 120 is a reflection / transmission control frame that controls the ratio of reflection and transmission of light passing through the through-hole 122 and light emitted from the periphery of the through-hole 122 of the light guide plate 120.
- An film 124 is provided over almost the entire surface of the light guide plate 120, thereby covering the opening end of the through hole 122.
- a diffusion sheet 96, a diffusion film 14, and a prism sheet 16 are provided in front of the reflection / transmission control film 124. Further, a reflector 98 is provided on the side end surface 120 a of the light guide plate 120.
- dot printing 28 is applied to the back surface of the light guide plate 120.
- the surface light source device 116 of the ninth embodiment as described above, the same effects as those of the seventh embodiment can be obtained.
- the area of the substrate 126 is large, the heat dissipation amount is increased, and the LED The heat from the module 118 can be effectively dissipated, and the LED module 118 can be driven with a large drive current.
- a large surface light source with uniform in-plane brightness and improved brightness Device 116 can be realized.
- FIG. 19 is an enlarged vertical sectional view showing the vicinity of the end of the surface light source device 130, and FIG.
- FIG. 9 is a cross-sectional view taken along line XX-XX.
- the surface light source device 130 of the present embodiment is different in the configuration of the light guide plate, the configuration and the arrangement position of the LED module, and the shape of the reflection / transmission control film and the reflector as the light control plate accordingly. Except for differences, the surface light source device 86 of the seventh embodiment has substantially the same configuration.
- the light guide plate 134 is a rectangular plate having a uniform thickness of 6 mm and a length and width of 305 mm X 340 mm. Further, the light guide plate 134 is formed of a transparent resin such as polymethylmetatalylate resin (PMMA), and as shown schematically in an exaggerated manner in FIG. 19, the diffusing agent D is dispersed in the transparent resin. It is a light scattering light guide plate!
- PMMA polymethylmetatalylate resin
- the diffusing agent D is a substance having a refractive index different from that of the transparent resin constituting the light guide plate 134, and inorganic fine particles such as silica, calcium carbonate, barium sulfate, and titanium oxide, and silicon.
- organic fine particles such as beads, PMMA beads, MS beads, and styrene beads are used.
- the average particle size of the diffusing agent D is preferably 0.1 m or more and 50 ⁇ m or less. If the average particle diameter of the diffusing agent D is 0.1 ⁇ m or more, the wavelength dependency of light scattering is reduced, and the color tone change of the light emitted from the light guide plate 134 is reduced. Moreover, if it is 50 / z m or less, a uniform surface light source device 130 free from glare caused by scattered light and uneven brightness can be obtained.
- the shape of the particles of the diffusing agent D is appropriately selected from an indefinite shape, a spherical shape, an elliptical shape, a needle shape, a square shape, and the like according to the purpose of use.
- the content of the diffusing agent D is preferably the type of the diffusing agent D (diffusing agent, transparent resin and (Bending rate difference), particle diameter, particle surface shape, and other conditions.
- the diffusing agent D in the light guide plate 134 is low, the light emission near the light incident portion of the light guide plate 134 is reduced, and the surface light source device 130 with uniform luminance can be easily configured. It becomes difficult to efficiently emit light propagating in the light plate 134 in the direction of the light exit surface of the light guide plate 134, and it becomes difficult to obtain the high-luminance surface light source device 130.
- the haze value of the light guide plate 134 can be used as a parameter indicating the degree of light scattering of the light guide plate 134.
- the haze value is measured by measuring the haze value in the thickness direction of the light guide plate 134 by the method described in Japanese Industrial Standard JIS-K7136.
- the haze value H (%) of the light guide plate 134 is preferably in a range that satisfies the following Expression 3 when the thickness of the light guide plate 134 is t (mm).
- the light guide plate 134 has a row of through-holes 136 spaced from the side end surface 134a of the light guide plate 134 inward by a predetermined distance from the position of 10 mm (160 mm interval in this embodiment)! /, In total 3 rows.
- the through holes 136 in each row are formed with a diameter of 7 mm and a hole pitch of 15.6 mm.
- Three substrates 142 are provided on the back surface of the light guide plate 134.
- an LED module 132 having the same configuration as the LED module 132 of the fourth embodiment is arranged.
- the dimension of the substrate 142 is about 305 (L) X 10 (W) X2 (t) mm.
- the LED module 132 is disposed at a position corresponding to the through hole 136.
- the LED module 1 Thirty-two 32 are arranged on the substrate 142 at a pitch of 15.6 mm (distance between the centers of the LED modules 132).
- a silicone resin for LED sealing containing 10 wt% of silica spherical particles having an average particle diameter of 2 ⁇ m is used as in the second embodiment.
- a reflection / transmission control frame that controls the ratio of reflection and transmission of light passing through the through hole 136 and light emitted from the periphery of the through hole 136 of the light guide plate 134.
- Ilum 138 is provided on the front surface (outgoing surface) of the light guide plate 134. This reflection / transmission control film 138 covers only the opening of the through hole 136 and its periphery.
- a diffusion sheet 96 that diffuses and equalizes the light emitted from the reflection / transmission control film 138 and erases the image of the light source as much as possible is provided on the light guide plate. It is provided through a diffuse reflection frame 144 for making the distance between 134 and the diffusion sheet 96 uniform.
- the height of the diffuse reflection frame 144 is 10 mm.
- a diffusion film 14 similar to that in the first embodiment and a prism sheet 16 that deflects light emitted from the diffusion film 14 in a substantially normal direction are provided in front of the diffusion sheet 96.
- dot printing 28 and a diffuse reflector 22 are provided on the back of the light guide plate 120 where the LED module 132 is not disposed.
- An L-shaped reflector 140 that covers the side end surface 134 a of the light guide plate 134 and the LED modules 136 on both end surfaces of the light guide plate 134 is provided at the side end of the light guide plate 134. Further, the heat radiating fins 102 are attached to the back surface of the substrate 142 via heat radiating sheets (not shown).
- the light can be emitted from 134 emission surfaces.
- a high-luminance surface light source device 130 with excellent in-plane luminance uniformity can be obtained.
- the reflector is provided so as to cover a part of the front surface and the side end surface of the light guide plate in each of the above-described embodiments.
- the present invention is not limited to this, and an appropriate portion of the light guide plate is provided as necessary.
- the LED module is provided in the through hole of the light guide plate that is formed so as to cover V, and it is arranged so as to cover at least the opening on the side! /.
- the position of the through hole in the exit surface of the light guide plate is not particularly limited, and may be a one-dimensional or two-dimensional array, for example, arranged in a pinecone pattern.
- the number and arrangement of the LED chip groups arranged in the LED module are not limited to those described in the above embodiments, but can be arbitrarily set in consideration of the size of the surface light source device and the LED module. it can. Similarly, the number and arrangement of LED modules can be set arbitrarily. Furthermore, the number and arrangement of LED arrays can be arbitrarily set for LED array modules configured by arranging multiple LED modules on the board. For example, by forming the interval between the through holes and the column interval of the light guide plate to be narrow at the center of the light guide plate and to increase toward the end of the light guide plate, the central portion of the light guide plate has high brightness. Luminance distribution characteristics can be obtained. At this time, the LED module may be arranged corresponding to the through hole.
- the LED chip group is configured to generate red, green, and blue light.
- the present invention is not limited to this, and any wavelength may be used as long as it generates light having different wavelengths. is there.
- the LED chip group is not limited to one that generates light of three types of wavelengths, as long as it generates light of at least two different types of wavelengths!
- the board 142 has a dimension of about 305 (L) X 10 (W) X 2 (t) mm and uses an aluminum material with excellent heat dissipation to efficiently dissipate the heat generated by the LED chip group 56. .
- the substrate 142 was prepared by applying an insulating layer on the surface of an aluminum base material, attaching a conductor such as copper foil thereon, and covering this conductor with an electrode wiring by a photolithography process.
- the substrate 142 has 20 concave portions having an opening diameter of 5.6 mm, a bottom diameter of 4.8 mm, and a depth of 0.5 mm arranged on the substrate 142 at intervals of 15.6 mm.
- the electrode 142 and the wiring portion were plated with silver or the like having high reflectivity, and the LED chip group 56 was fixed to the recess, and then connected to the electrode on the substrate 142 by a bonding wire.
- the LED chip group 56 consists of three AlGalnP—red LED chips 56r (emission center wavelength 62 5 nm), five InGaN—green LED chips 56 g (emission center wavelength 525 nm), and two InGa N—blue LED chips. Each LED chip is 0.38 mm square and the same size.
- the LED chip group 56 After mounting the LED chip group 56, the LED chip group 56 is sealed by injecting LED sealing silicone resin containing 10wt% of silica spherical particles with an average particle diameter of 2 ⁇ as a sealing resin in the recess.
- the LED module 132 was turned off.
- Silica spherical particles are added to the silicone encapsulating resin for LED sealing, and then treated with HYBRID DE FOAMING MIXER (Sinky Products ARE-250) for 3 minutes and defoamed for 1 minute. Dispersed in fat.
- a transparent polymetatalylate resin (trade name: Acrylite L # 001 transparent grade [Mitsubishi Rayon Co., Ltd.], haze at 6mm thickness 0.3%) was used. .
- the light guide plate material was cut so that the planar shape had a rectangular width of 305 mm and a length of 340 mm.
- the row of through-holes 136 is placed in the light guide plate 134 at a position 10 mm inward from both ends of the short side (305 mm side end face) of the light guide plate 134 and a center position of the light guide plate 134 (inward from the end face of the 305 m side).
- a total of 3 rows were formed in 1 70 mm).
- the through-holes 136 were formed with a diameter of 7 mm and a hole pitch of 15.6 mm, and 20 holes were arranged in one row (total of 3 rows in 60 rows).
- the inner wall of the through-hole 134 was mirror-polished with a small feather polisher.
- the through holes 136 formed in a row on the light guide plate 134 were formed corresponding to the arrangement of the LED modules 132.
- the side surface (cut surface) of the light guide plate 134 was mirror-polished with a grinding and polishing machine (Megalotech-powered product, product name Plavuity).
- a grinding and polishing machine (Megalotech-powered product, product name Plavuity).
- a range of 10 mm from the short side end face (305 mm side end face) of the obtained light guide plate 134 toward the light incident direction was covered with the reflector 140, and this portion was used as a frame portion.
- the LED module 132 is disposed below the light guide plate 134 in correspondence with the through holes 136 formed in a row on the light guide plate 134.
- a diffuse reflector 22 (Gieden Co., Ltd., trade name: RF188) was placed on the back of the light guide plate 134 where the LED module 132 was not placed.
- an aluminum heat radiation fin 102 and a silicone heat transfer sheet (not shown: Kitagawa Kogyo Co., Ltd. product, silicone heat transfer sheet product number; 430-6510) are provided. Attached.
- the width of the reflector 140 that covers the upper part of the through hole 136 was 10 mm from the end of the light guide plate 134.
- the effective light emitting surface of the light guide plate 134 is 305 ⁇ 320 mm.
- the reflection / transmission control film 138 disposed on the front surface (outgoing surface) of the light guide plate 134 is preliminarily placed on a diffusion film (thickness: 125 ⁇ m) with a transmittance of 54% and a haze value of 98%.
- Circular printing with a diameter of 8 mm at the corresponding position screen printing with white ink (VAR—White, Teikoku Ink Manufacturing Co., Ltd.) using a 280 mesh screen plate, circular white printing Based on the center of the part, it was cut into dimensions of 305mm in length and 10mm in width.
- the circular white printed portion of the reflection / transmission control film 138 was arranged corresponding to the LED module 132.
- a diffuse reflection frame 144 having an inner dimension of 295 mm ⁇ 310 mm and a thickness of 5 mm was disposed on the front surface of the light guide plate 134 so as to surround the periphery of the effective light emitting surface of the light guide plate 134.
- the diffuse reflection frame 144 was prepared by bonding a diffuse reflection plate (Gidden product, trade name: RF188) to the inner surface side of the above-described resin frame.
- a diffuse reflection plate Gibden product, trade name: RF188
- a diffusion sheet 96 (Mitsubishi Rayon product, Atarilite NA88, length 305 mm x width 320 mm x thickness 2 mm) is placed in front of the light guide plate 134 and the reflection / transmission control film 138 via the diffuse reflection frame 144. Arranged. (Diffusion sheet 96 is placed 10mm ahead of light guide plate 134)
- a diffusion film 14 (Kimoto product, Light-up DX100) of the same size as the diffusion sheet 96 and a prism sheet 16 (Sumitomo 3EM product, BEF-III) are stacked one by one in this order.
- the prism sheet 16 was arranged so that the ridge line of the prism was parallel to the long side direction (320 mm) of the light guide plate 134.
- the dimensions of the effective light emitting surface in the surface light source device were 295 ⁇ 310 mm in length and width, and the distance (thickness) to the front surface of the diffuse reflection frame 144 and the diffusion film 14 was about 14 mm.
- Example 1 except that the material of the light guide plate 134 was changed to a light scattering light guide plate (trade name; Acrylite L—N—875 [product of Mitsubishi Rayon Co., Ltd.], haze at 6 mm thickness 3.5%) The same as the above.
- a light scattering light guide plate (trade name; Acrylite L—N—875 [product of Mitsubishi Rayon Co., Ltd.], haze at 6 mm thickness 3.5%) The same as the above.
- Example 2 The same procedure as in Example 1 was performed, except that the reflection / transmission control film 138 directly above the central LED light source was arranged with a buoyancy of 6 mm from the diffuse reflection frame 144 without incorporating the light guide plate material.
- a 50mA DC current is applied to each LED chip of each color of the LED module 132. After module 132 was lit, it was left to stabilize for 15 minutes. The luminance distribution of the surface light source device after 15 minutes was measured with the following luminance meter.
- Luminance meter ProMetric— 1400 (product of Radiant Imaging, USA)
- the distance between the luminance meter and the surface light source device is 1050mm ahead of the front surface of the surface light source device 130!
- Table 2 shows the average brightness at the position of ⁇ 140 mm (280 mm) and the standard deviation value of the in-plane brightness when the center position in the center line brightness distribution is 0.
- the thickness of the surface light source device indicates the distance from the front surface of the diffuse reflection frame 144 to the front surface of the diffusion film 14.
- the uniformity was calculated from the in-plane minimum luminance (cdZm 2 ) ⁇ 100 (%) maximum in-plane luminance (cdZ m 2 ).
- Example 1 a surface light source device having a configuration in which the thickness of the surface light source device was thin and having a high luminance and a uniform in-plane luminance distribution was obtained.
- Example 2 a surface light source device having a high standardity with a small standard deviation was obtained over the entire surface where the luminance near the light incident portion of the light guide plate was also high.
- Comparative Example 1 the 1S luminance distribution in which the thickness of the surface light source device was the same as that of Example 1 and Example 2 was not uniform. In Comparative Example 2, a uniform luminance distribution was obtained over the entire surface, but the surface light source device was thick and the luminance was low.
- FIG. 1 is an enlarged longitudinal sectional view showing the vicinity of an end of a surface light source device according to a first embodiment of the present invention.
- FIG. 2 is a cross-sectional view taken along the line ⁇ - ⁇ in FIG.
- FIG. 4 A sectional view taken along line IV-IV in FIG.
- FIG. 6 A longitudinal sectional view showing the vicinity of the end of the surface light source device according to the third embodiment of the present invention in an enlarged manner.
- FIG. 8 A longitudinal sectional view showing an enlarged vicinity of an end portion of the surface light source device according to the fourth embodiment of the present invention.
- FIG. 10 A sectional view taken along line XX of FIG.
- FIG. 12 is a sectional view taken along the line ⁇ - ⁇ in FIG.
- FIG. 14 is a sectional view taken along line XIV-XIV in FIG.
- FIG. 16 is a sectional view taken along line XVI-XVI in FIG.
- FIG. 18 is a cross-sectional view taken along line XVIII-XVIII in FIG.
- FIG. 20 is a cross-sectional view taken along line XX—XX in FIG.
- FIG. 21 is a dot pattern occupation area ratio of gradation in Example 1 and Example 2 of the present invention.
- FIG. 22 is a luminance distribution diagram in Example 1, Example 2, Comparative Example 1, and Comparative Example 2.
- FIG. 23 is a longitudinal sectional view of a side end portion of a conventional surface light source device.
- FIG. 24 is a cross-sectional view taken along line XXIV-XXIV in FIG.
- FIG. 25 is a longitudinal sectional view of a side end portion of a conventional surface light source device.
- FIG. 26 is a sectional view taken along line XXVI-XXVI in FIG.
Abstract
Description
Claims
Priority Applications (1)
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JP2007514195A JPWO2007105671A1 (ja) | 2006-03-10 | 2007-03-12 | 面光源装置 |
Applications Claiming Priority (2)
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JP2006-065714 | 2006-03-10 | ||
JP2006065714 | 2006-03-10 |
Publications (1)
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WO2007105671A1 true WO2007105671A1 (ja) | 2007-09-20 |
Family
ID=38509492
Family Applications (1)
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PCT/JP2007/054783 WO2007105671A1 (ja) | 2006-03-10 | 2007-03-12 | 面光源装置 |
Country Status (4)
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JP (1) | JPWO2007105671A1 (ja) |
KR (1) | KR20080100451A (ja) |
TW (1) | TW200741138A (ja) |
WO (1) | WO2007105671A1 (ja) |
Cited By (12)
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---|---|---|---|---|
JP2009231027A (ja) * | 2008-03-21 | 2009-10-08 | Toshiba Lighting & Technology Corp | 照明装置 |
JP2010140704A (ja) * | 2008-12-10 | 2010-06-24 | Kuraray Co Ltd | 導光板及び導光板の製造方法 |
JP2010250974A (ja) * | 2009-04-10 | 2010-11-04 | Nittoh Kogaku Kk | 発光装置および看板用の照明装置 |
JP2011071404A (ja) * | 2009-09-28 | 2011-04-07 | Kyocera Corp | 発光装置および照明装置 |
JP2011210646A (ja) * | 2010-03-30 | 2011-10-20 | Kuraray Co Ltd | 面発光体およびフロントライト装置 |
JP2012186154A (ja) * | 2011-02-14 | 2012-09-27 | Semiconductor Energy Lab Co Ltd | 光学素子、発光装置、照明装置、及び光学素子の作製方法 |
WO2013060351A1 (de) * | 2011-10-24 | 2013-05-02 | Osram Ag | Beleuchtungseinrichtung mit einer optischen anordnung zur farbmischung von lichtquellen |
FR2989151A1 (fr) * | 2012-04-04 | 2013-10-11 | Cooper Technologies Co | Luminaire a diodes electroluminescentes avec diffusion homogene de lumiere |
TWI465778B (zh) * | 2009-07-06 | 2014-12-21 | Sumitomo Chemical Co | A light control panel, a surface light source device, and a transmission type image display device |
EP2314911A3 (en) * | 2009-10-26 | 2016-07-20 | Young Lighting Technology Corporation | Light source apparatus |
JP2017504220A (ja) * | 2013-11-08 | 2017-02-02 | オスラム オプト セミコンダクターズ ゲゼルシャフト ミット ベシュレンクテル ハフツングOsram Opto Semiconductors GmbH | オプトエレクトロニクス部品、オプトエレクトロニクス装置、光学要素の製造方法、およびオプトエレクトロニクス部品の製造方法 |
JP2021106277A (ja) * | 2019-08-02 | 2021-07-26 | 日亜化学工業株式会社 | 発光装置 |
Families Citing this family (3)
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TWI402544B (zh) * | 2008-09-01 | 2013-07-21 | Coretronic Corp | 導光單元及背光模組 |
KR101702127B1 (ko) * | 2010-03-25 | 2017-02-02 | 엘지전자 주식회사 | 디스플레이 장치 |
KR101868540B1 (ko) * | 2011-12-07 | 2018-06-19 | 엘지이노텍 주식회사 | 광원 모듈 및 이를 포함하는 헤드 램프 |
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- 2007-03-12 WO PCT/JP2007/054783 patent/WO2007105671A1/ja active Application Filing
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Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009231027A (ja) * | 2008-03-21 | 2009-10-08 | Toshiba Lighting & Technology Corp | 照明装置 |
JP2010140704A (ja) * | 2008-12-10 | 2010-06-24 | Kuraray Co Ltd | 導光板及び導光板の製造方法 |
JP2010250974A (ja) * | 2009-04-10 | 2010-11-04 | Nittoh Kogaku Kk | 発光装置および看板用の照明装置 |
TWI465778B (zh) * | 2009-07-06 | 2014-12-21 | Sumitomo Chemical Co | A light control panel, a surface light source device, and a transmission type image display device |
JP2011071404A (ja) * | 2009-09-28 | 2011-04-07 | Kyocera Corp | 発光装置および照明装置 |
EP2314911A3 (en) * | 2009-10-26 | 2016-07-20 | Young Lighting Technology Corporation | Light source apparatus |
JP2011210646A (ja) * | 2010-03-30 | 2011-10-20 | Kuraray Co Ltd | 面発光体およびフロントライト装置 |
JP2012186154A (ja) * | 2011-02-14 | 2012-09-27 | Semiconductor Energy Lab Co Ltd | 光学素子、発光装置、照明装置、及び光学素子の作製方法 |
US9751267B2 (en) | 2011-02-14 | 2017-09-05 | Semiconductor Energy Laboratory Co., Ltd. | Optical element, light-emitting device, lighting device, and method for manufacturing optical element |
WO2013060351A1 (de) * | 2011-10-24 | 2013-05-02 | Osram Ag | Beleuchtungseinrichtung mit einer optischen anordnung zur farbmischung von lichtquellen |
FR2989151A1 (fr) * | 2012-04-04 | 2013-10-11 | Cooper Technologies Co | Luminaire a diodes electroluminescentes avec diffusion homogene de lumiere |
JP2017504220A (ja) * | 2013-11-08 | 2017-02-02 | オスラム オプト セミコンダクターズ ゲゼルシャフト ミット ベシュレンクテル ハフツングOsram Opto Semiconductors GmbH | オプトエレクトロニクス部品、オプトエレクトロニクス装置、光学要素の製造方法、およびオプトエレクトロニクス部品の製造方法 |
US10916686B2 (en) | 2013-11-08 | 2021-02-09 | Osram Oled Gmbh | Optoelectronic component, optoelectronic arrangement, method of producing an optical element, and method of producing an optoelectronic component |
JP2021106277A (ja) * | 2019-08-02 | 2021-07-26 | 日亜化学工業株式会社 | 発光装置 |
JP7108217B2 (ja) | 2019-08-02 | 2022-07-28 | 日亜化学工業株式会社 | 発光装置 |
US11450707B2 (en) | 2019-08-02 | 2022-09-20 | Nichia Corporation | Light emission device |
US11929387B2 (en) | 2019-08-02 | 2024-03-12 | Nichia Corporation | Light emission device |
Also Published As
Publication number | Publication date |
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TW200741138A (en) | 2007-11-01 |
JPWO2007105671A1 (ja) | 2009-07-30 |
KR20080100451A (ko) | 2008-11-18 |
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