WO2020196572A1 - Dispositif de source de lumière plane et dispositif d'affichage - Google Patents

Dispositif de source de lumière plane et dispositif d'affichage Download PDF

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Publication number
WO2020196572A1
WO2020196572A1 PCT/JP2020/013185 JP2020013185W WO2020196572A1 WO 2020196572 A1 WO2020196572 A1 WO 2020196572A1 JP 2020013185 W JP2020013185 W JP 2020013185W WO 2020196572 A1 WO2020196572 A1 WO 2020196572A1
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Prior art keywords
light
light emitting
reflecting
emitting device
reflection
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PCT/JP2020/013185
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English (en)
Japanese (ja)
Inventor
祐介 大橋
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株式会社エンプラス
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Publication of WO2020196572A1 publication Critical patent/WO2020196572A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction

Definitions

  • the present invention relates to a surface light source device and a display device.
  • a surface light source device may be used to uniformly illuminate the display panel.
  • the light emitted from the light source is spread in the surface direction by the light guide plate and irradiated toward the display panel (see, for example, Patent Document 1).
  • the display device described in Patent Document 1 includes a backlight assembly (surface light source device) and a display panel.
  • the backlight assembly includes a first light guide plate, a second light guide plate, a light source portion, a lid portion, and a print sheet.
  • the first light guide plate and the second light guide plate are arranged on the same plane so as to be separated from each other.
  • the light source unit is arranged between the first light guide plate and the second light guide plate.
  • the lid portion is arranged so as to be directly above the light source portion and to overlap a part of the first light guide plate and the second light guide plate, respectively.
  • the light source unit has a first light source arranged to face the first light guide plate and a second light source arranged to face the second light source plate.
  • the print sheet is arranged between the light source portion and the lid portion.
  • the print sheet has a film and a print pattern.
  • the print pattern is formed at a position corresponding to the first light source or the second light source, and is formed so as to become smaller as the distance from the first light source or the second light source increases.
  • the light source portion is surrounded by the first light guide plate, the second light guide plate, and the lid portion.
  • the light emitted from the light source unit and traveling toward the first light guide plate and the second light guide plate is guided by the first light guide plate and the second light guide plate, respectively, and reaches the display panel.
  • the light emitted from the light source unit and traveling toward the lid portion passes through the print sheet and reaches the lid portion.
  • the print pattern of the print sheet suppresses the generation of bright lines and dark lines caused by the first light source and the second light source.
  • An object of the present invention is to provide a surface light source device and a display device capable of suppressing the visibility of bright areas generated in a band shape and improving the uniformity of the light emitting surface.
  • the surface light source device has a housing having an opening arranged on the bottom plate and the opposite side of the bottom plate, a row of light emitting devices arranged in the first direction on the bottom plate, and arranged on the bottom plate. It has a reflecting plate that reflects the light emitted from the light emitting device row, and a light diffusing plate that is arranged so as to cover the opening and transmits the light from the light emitting device row while diffusing it.
  • a plurality of light emitting devices including a light emitting element and a light beam control member for controlling light distribution of light emitted from the light emitting element are arranged at regular intervals in the first direction.
  • the light beam control member has an incident surface formed on the bottom plate side for incident light emitted from the light emitting element, and at least a part of the light incident on the incident surface along the reflecting plate and the first.
  • Two reflecting surfaces formed on the light diffusing plate side that reflect light in directions that are orthogonal to each other and that are substantially opposite to each other, and two that emit light reflected by the reflecting surface to the outside.
  • the reflecting plate includes a light emitting surface, is arranged in parallel with the light emitting device row along the first direction, and has a reflection adjusting unit for adjusting the amount of reflection of light emitted from the light emitting device row.
  • the reflection adjusting unit includes a first reflecting unit that reflects the light emitted from the light emitting device row toward the light diffusing plate, and a second reflecting unit having a lower reflectance than the first reflecting unit. Including, the first reflecting portion and the second reflecting portion are alternately arranged along the first direction, and the center-to-center distance between two adjacent light emitting devices in the first direction is adjacent to each other. It is different from the total repeating length of the first reflecting portion and the second reflecting portion.
  • the display device includes a surface light source device according to the present invention and a display member arranged on the light diffusing plate.
  • the present invention it is possible to provide a surface light source device and a display device capable of suppressing the visibility of bright portions generated in a band shape and improving the uniformity of the light emitting surface.
  • FIG. 1A to 1C are views showing the configuration of the surface light source device according to the first embodiment of the present invention.
  • 2A and 2B are views showing the configuration of the surface light source device according to the first embodiment of the present invention.
  • 3A to 3E are views showing the configuration of the luminous flux control member.
  • 4A and 4B are schematic views showing a specific example of the second reflecting portion.
  • 5A and 5B are diagrams showing the relationship between the pitch between the light emitting devices and the total length of the first reflecting portion and the second reflecting portion.
  • FIG. 6 is a diagram showing a configuration of a surface light source device according to a second embodiment of the present invention.
  • FIGS. 2A and 2B are diagrams showing the configuration of the surface light source device 100 according to the present embodiment.
  • 1A is a plan view of the surface light source device 100
  • FIG. 1B is a side view
  • FIG. 1C is a front view.
  • FIG. 2A is a plan view with the light diffusing plate 150 removed
  • FIG. 2B is a partially enlarged cross-sectional view taken along the line AA in FIG. 1A.
  • the light emitting device 130 is displayed in a large size.
  • the surface light source device 100 includes a housing 110, a substrate 120, a light emitting device row 130A including a plurality of light emitting devices 130, a reflector 140, and light diffusion. It has a plate 150 and. Further, as shown in FIG. 1C, the surface light source device 100 can also be used as a display device 100'by combining with a display member (irradiated member) 160 such as a liquid crystal panel.
  • a display member irradiated member
  • the housing 110 houses the substrate 120, the light emitting device row 130A, and the reflector 140 inside.
  • the housing 110 is a box that is at least partially open.
  • the housing 110 has a bottom plate 111 and an opening arranged on the opposite side of the bottom plate 111.
  • the housing 110 has a bottom surface 111a, which is the surface of the bottom plate 111, two first inclined surfaces 112, and two second inclined surfaces 113.
  • the bottom surface 111a is a horizontal plane.
  • a substrate 120 and a reflector 140 are arranged on the upper surface of the bottom plate 111.
  • the two first inclined surfaces 112 and the two second inclined surfaces 113 are arranged so as to sandwich the bottom surface 111a, and are inclined so as to approach the light diffusing plate 150 as the distance from the light emitting element 131 increases.
  • the two first inclined surfaces 112 and the two second inclined surfaces 113 reflect the light emitted from the light emitting device row 130A in the substantially horizontal direction toward the light diffusing plate 150 and are emitted from the light emitting device row 130A. Light can be easily collected on the light diffusing plate 150. That is, the first inclined surface 112 and the second inclined surface 113 can each function as reflective surfaces.
  • the first inclined surface 112 and the second inclined surface 113 may be a flat surface or a curved surface, respectively. In the present embodiment, both the first inclined surface 112 and the second inclined surface 113 are flat surfaces.
  • the inclination angle of the first inclined surface 112 with respect to the bottom surface 111a is, for example, 6 to 9 °
  • the inclination angle of the second inclined surface 113 with respect to the bottom surface 111a is, for example, 40 to 50 °.
  • the inclination angle of the first inclined surface 112 (or the second inclined surface 113) with respect to the bottom surface 111a means the smaller angle between the first inclined surface 112 (or the second inclined surface 113) and the bottom surface 111a. ..
  • the inclination angle with respect to the bottom surface 111a means the inclination angle with respect to the horizontal portion of the bottom surface 111a.
  • the size of the opening of the housing 110 corresponds to the size of the light emitting region formed on the light diffusing plate 150, and is, for example, 400 mm ⁇ 700 mm (32 inches). This opening is closed by the light diffusing plate 150.
  • the height (space thickness) from the surface of the bottom surface 111a to the light diffusing plate 150 is not particularly limited, but is about 10 to 40 mm.
  • the housing 110 is made of, for example, a resin such as polymethyl methacrylate (PMMA) or polycarbonate (PC), or a metal such as stainless steel or aluminum.
  • the substrate 120 is arranged on the bottom plate 111 (bottom side 111a) of the housing 110.
  • the substrate 120 is a flat plate for arranging the light emitting device rows 130A in the housing 110 at predetermined intervals.
  • the surface of the substrate 120 reflects the light arriving from the light emitting device row 130A toward the light diffusing plate 150. That is, the surface of the substrate 120 can also function as a reflective surface.
  • the light emitting device row 130A has a plurality of light emitting devices 130.
  • the number of light emitting device rows 130A is not particularly limited.
  • the light emitting device row 130A may be a single row or a plurality of rows. In the present embodiment, the light emitting device row 130A is one row. The case where the light emitting device rows 130A are a plurality of rows will be described later (see the second embodiment).
  • Each of the plurality of light emitting devices 130 includes a light emitting element 131 and a luminous flux control member 132 that controls the light distribution of the light emitted from the light emitting element 131.
  • the light emitting element 131 is arranged on the substrate 120.
  • the light emitting element 131 is a light source of the surface light source device 100 (and the light emitting device 130), and emits light from the upper end portions of the upper surface and the side surface.
  • the light emitting element 131 is, for example, a light emitting diode (LED).
  • the color of the light emitted from the vicinity of the light emitting center of the light emitting element 131 can be appropriately selected.
  • the color of the light emitted from the vicinity of the light emitting center of the light emitting element 131 may be white or blue. In the present embodiment, the color of the light emitted from the vicinity of the light emitting center of the light emitting element 131 is white.
  • the height of the light emitting surface of the light emitting element 131 is the same as or equal to the back surface 176 of the light flux control member 132. Is preferably higher than.
  • the luminous flux control member 132 controls the light distribution of the light emitted from the light emitting element 131.
  • the luminous flux control member 132 is arranged on the light emitting element 131 so that its central axis CA coincides with the optical axis OA of the light emitting element 131 (see FIG. 2B).
  • the “optical axis OA of the light emitting element 131” means a light beam at the center of a three-dimensional emitted light flux from the light emitting element 131.
  • the “central axis CA of the luminous flux control member 132” means, for example, a axis of symmetry that is twice symmetrical.
  • the luminous flux control member 132 emits the light emitted from the light emitting element 131 from the two emission surfaces 173 described later toward the two first inclined surfaces 112 (the two emission surfaces 173 described later have: (As opposed to each of the two first inclined surfaces 112).
  • the light emitting center of the light emitting element 131 is set as the origin
  • the axis parallel to the optical axis OA of the light emitting element 131 is set as the Z axis
  • the direction orthogonal to the Z axis is arranged (light emitting).
  • the axis parallel to the device row 130A) is defined as the Y axis
  • the Z axis and the axis orthogonal to the Y axis are defined as the X axis.
  • the arrangement direction of the light emitting device row 130A (the arrangement direction of the plurality of light emitting devices 130) is set as the first direction (Y direction), and the direction orthogonal to the first direction along the surface of the substrate 120 is the second direction (X direction). ).
  • the material of the luminous flux control member 132 is not particularly limited as long as it can pass light of a desired wavelength.
  • the material of the light beam control member 132 is a light-transmitting resin such as polymethyl methacrylate (PMMA), polycarbonate (PC), epoxy resin (EP), or glass.
  • 3A to 3E are views showing the configuration of the luminous flux control member 132.
  • 3A is a plan view of the luminous flux control member 132
  • FIG. 3B is a front view
  • FIG. 3C is a bottom view
  • FIG. 3D is a side view
  • FIG. 3E is shown in FIG. 3A. It is sectional drawing of line AA.
  • the substrate 120 side (light emitting element 131 side) is referred to as the “back side”
  • the light diffusing plate 150 side is referred to as the “front side”.
  • the luminous flux control member 132 controls the light distribution of the light emitted from the light emitting element 131. As shown in FIGS. 3A to 3E, the luminous flux control member 132 has an incident surface 171, two reflecting surfaces 172, two emitting surfaces 173, two flange portions 174, and four leg portions 175. ..
  • the incident surface 171 is incident with the light emitted from the light emitting element 131.
  • the incident surface 171 is arranged on the back side (reflector 140 side, back surface 176) of the luminous flux control member 132 so as to intersect the optical axis OA.
  • the shape of the incident surface 171 is not particularly limited as long as it can exhibit the above functions.
  • the shape of the incident surface 171 may be a flat surface or an inner surface of a recess 177 opened in the back surface 176. In the present embodiment, the incident surface 171 is the inner surface of the recess 177 opened in the back surface 176.
  • the shape of the recess 177 is also not particularly limited.
  • the recess 177 has an inner top surface 177a (first incident surface) and an inner surface 177b (second incident surface) that faces the inner surface 177a in the X-axis direction with the inner surface 177a (first incident surface).
  • the number of the inner surface surface 177a (first incident surface) and the inner surface surface 177b (second incident surface) is not particularly limited, and may be one or two or more, respectively. In the present embodiment, the number of the inner top surface 177a and the inner surface surface 177b is two, respectively.
  • the inner top surface 177a (first incident surface) and the inner surface 177b (second incident surface) may be flat or curved, respectively.
  • the inner top surface 177a is a curved surface that is convex to the back side in a cross section (virtual cross section) including the optical axis OA and the X axis from the viewpoint of facilitating the incident light reaching the reflecting surface 172.
  • the inner side surface 177b is a flat surface.
  • the inner surface (incident surface 171) of the recess 177 may further have another surface.
  • the two reflecting surfaces 172 are arranged at positions (front side) facing the light emitting element 131 with the incident surface 171 in between. Further, the two reflecting surfaces 172 have at least a part of the light incident on the inner surface surface 177a in two directions (both of which are substantially perpendicular to the optical axis OA of the light emitting element 131 and substantially opposite to each other). Reflect in the direction along the X axis). In the above virtual cross section, the two reflecting surfaces 172 are formed so as to be separated from the X-axis as they are separated from the optical axis OA.
  • the inclination of the tangent line gradually decreases (along the X axis) from the optical axis OA of the light emitting element 131 toward the end (exit surface 173). Like) each is formed.
  • the two exit surfaces 173 are arranged so as to face each other (in the X-axis direction) with the two reflection surfaces 172 in between.
  • the two exit surfaces 173 allow light incident on the inner top surface 177a and reflected by the reflection surface 172 and light incident on the inner surface 177b and directly arriving to the outside (first inclined surface of the housing 110). (Toward 112).
  • the exit surface 173 may be a flat surface or a curved surface.
  • the exit surface 173 is a surface substantially parallel to the optical axis OA in the virtual cross section. “Approximately parallel to the optical axis OA” means that the smaller angle between the optical axis OA and the exit surface 173 is 3 ° or less in the virtual cross section.
  • the smaller angle between the optical axis OA and the exit surface 173 is the curve of the optical axis OA and the virtual cross section of the exit surface 173 in the virtual cross section. It means the smaller angle of the angle formed by the tangent line.
  • the two flange portions 174 are arranged so as to project in the Y-axis direction with respect to the optical axis OA between the two reflecting surfaces 172 near the optical axis OA.
  • the flange portion 174 facilitates the handling and alignment of the luminous flux control member 132.
  • the shape of the collar portion 174 may be a shape that can control and emit the light incident on the collar portion 174.
  • the four legs 175 are substantially columnar members protruding from the back surface 176.
  • the leg portion 175 supports the luminous flux control member 132 at an appropriate position with respect to the light emitting element 131 (see FIG. 2B).
  • the leg portion 175 may be fitted into a hole portion formed in the substrate 120 and used for positioning. Further, the legs 175 need only be able to stably fix the luminous flux control member 132 to the substrate 120 in consideration of not having an adverse effect optically, and the position, shape and number of the legs 175 are particularly limited. Not done.
  • a total of four legs 175 are arranged around the incident surface 171 on the back surface 176.
  • the reflector 140 has a reflection adjusting unit 141 that adjusts the amount of reflection of the light emitted from the light emitting device row 130A.
  • the number of reflection adjusting units 141 is not particularly limited. In the present embodiment, there is one reflection adjusting unit 141 on both sides of the light emitting device row 130A on the bottom plate 111 so as to sandwich the light emitting device row 130A in the second direction (direction along the X axis). They are arranged one by one.
  • the two reflection adjusting units 141 are arranged on the bottom surface 111a in a part of the bottom surface 111a where the light emitted from the luminous flux control member 132 reaches (see FIGS. 4A and 4B).
  • the two reflection adjusting units 141 are arranged on the bottom surface 111a on both sides of the luminous flux control member 132 in the direction in which the two exit surfaces 173 of the luminous flux control member 132 face each other (X-axis direction). Has been done.
  • the reflection adjusting unit 141 emits light emitted from the upper end portion of the side surface of the light emitting element 131, and is emitted from the vicinity of the upper end portion of the emitting surface 173 of the luminous flux control member 132, and reaches the bottom surface 111a with a strong yellowish light. (Light on the long wavelength side) arrives.
  • the reflection adjusting unit 141 is not arranged on the bottom surface 111a in one or both of the directions (Y-axis direction) orthogonal to the direction in which the two emission surfaces 173 face each other with respect to the luminous flux control member 132. 2 A and B). This is because the light emitted from the luminous flux control member 132 in the Y-axis direction is less likely to be reflected on the bottom surface 111a than the light emitted from the emission surface 173, and contributes less to the brightness.
  • the reflection adjusting unit 141 has a first reflection unit 141A and a second reflection unit 141B.
  • the first reflecting portion 141A and the second reflecting portion 141B are alternately arranged along the first direction.
  • the first reflecting unit 141A reflects the light emitted from the light emitting device row 130A toward the light diffusing plate 150.
  • the first reflecting portion 141A is a part of the surface of the reflecting plate 140.
  • the first reflecting portion 141A and the second reflecting portion 141B are alternately arranged along the first direction.
  • the first reflection unit 141A or the second reflection unit 141B are arranged at positions facing each other with the light emitting device 130 sandwiched between them.
  • the light emitting device 130 may be arranged so as to be sandwiched between the first reflecting portion 141A and the second reflecting portion 141B.
  • the second reflecting portion 141B may be arranged so as to meander at a predetermined cycle in the first direction. In this case, in the first direction, the region without the second reflecting portion 141B becomes the first reflecting portion 141A.
  • the reflectance of light having a wavelength of 550 nm in the first reflecting unit 141A is R1 550
  • the reflectance of light having a wavelength of 630 nm is R1 630
  • the reflectance of light having a wavelength of 450 nm in the second reflecting unit 141B is R2 450 , light having a wavelength of 550 nm.
  • the first reflecting portion 141A and the second reflecting portion 141B preferably satisfy the following formulas (1) to (3).
  • the reflectances R1 550 and R1 630 on the long wavelength side (yellow region) of the first reflecting portion 141A are the reflectance R2 on the long wavelength side (yellow region) of the second reflecting portion 141B. 550 , higher than R2 630 . That is, in the first reflecting unit 141A, the reflectance of the light emitted from the emitting surface 173 of the luminous flux control member 132 is maintained, so that the decrease in brightness can be suppressed.
  • the second reflecting unit 141B has a lower reflectance than the first reflecting unit 141A. That is, the second reflecting unit 141B reduces the light from the light emitting device row 130A and reflects it toward the light diffusing plate 150.
  • the reflection reduction layer 142 is arranged in an island shape. The reflectance of the second reflecting portion 141B can be adjusted by adjusting the ratio of the reflection reducing layer 142 to the entire second reflecting portion 141B.
  • the plan view shape of the reflection reduction layer 142 is circular. Further, the reflection reduction layer 142 is formed so that its surface area becomes smaller as the distance from the light emitting device row 130A increases.
  • the color of the reflection reduction layer 142 is not particularly limited. The color of the reflection reduction layer 142 is appropriately selected according to the color of the reflection adjustment unit 141.
  • the reflectance on the long wavelength side (for example, the yellow region) is made lower than the reflectance on the short wavelength side (for example, the blue region).
  • the light emitted from the side surface of the light emitting element 131 which is emitted from the vicinity of the upper end portion of the emission surface 173 of the luminous flux control member 132, and reaches the bottom surface 111a, is the light having a strong yellowish color.
  • a large amount can be absorbed by the two reflecting portions 141B.
  • the yellowness of the light emitted from the vicinity of the upper end portion of the emission surface 173 of the luminous flux control member 132 and reflected on the bottom surface 111a can be reduced. Further, by setting these reflectances to 60% or more, it is possible to suppress a decrease in brightness.
  • the reflectances R2 450 , R2 550 and R2 630 of the second reflecting portion 141B are preferably not too low, and more preferably 80% or more, from the viewpoint of making it easier to suppress the decrease in brightness.
  • 5A and 5B are diagrams showing the relationship between the center-to-center distance between adjacent light emitting elements 131 and the total repeating length of the adjacent first reflecting portion 141A and second reflecting portion 141B.
  • the center-to-center distance between two adjacent light emitting devices 130 is different from the total repeating length of the adjacent first reflecting unit 141A and second reflecting unit 141B.
  • the center-to-center distance P1 of the two adjacent light emitting devices 130 is the total repeating length of the adjacent first reflecting portion 141A and the second reflecting portion 141B. It may be shorter than P2. Also, as shown in FIG. 5B, P1 may be longer than P2. Further, although not particularly shown, it is preferable that P1 is not a multiple of P2 and P2 is not a multiple of P1. As described above, since the light emitting device 130 and the first reflecting portion 141A or the second reflecting portion 141B are not arranged so as to correspond to each other, the visibility of the bright portion generated in a band shape can be suppressed.
  • the light diffusing plate 150 is arranged so as to cover the opening of the housing 110.
  • the light diffusing plate 150 is a plate-shaped member having light transmissivity and light diffusing property, and transmits the emitted light from the emitting surface 173 of the luminous flux control member 132 while diffusing it.
  • the light diffusing plate 150 can be, for example, a light emitting surface of the surface light source device 100.
  • the material of the light diffusing plate 150 can be appropriately selected as long as it can transmit the light emitted from the emitting surface 173 of the light flux control member 132 while diffusing it.
  • Examples of the material of the light diffusing plate 150 include a light transmissive resin such as polymethyl methacrylate (PMMA), polycarbonate (PC), polystyrene (PS), and styrene / methyl methacrylate copolymer resin (MS).
  • PMMA polymethyl methacrylate
  • PC polycarbonate
  • PS polystyrene
  • MS styrene / methyl methacrylate copolymer resin
  • the light diffusing plate 150 has fine irregularities formed on its surface, or light diffusing elements such as beads are dispersed inside the light diffusing plate 150.
  • the light emitted from each light emitting element 131 is light (light emission) particularly directed to the first inclined surface 112 so as to illuminate a wide range of the light diffusing plate 150 by the luminous flux control member 132.
  • Light is emitted in two directions (the X-axis direction in FIG. 3A) that are substantially perpendicular to the optical axis OA of the element 131 and that are substantially opposite to each other.
  • a part of the light emitted from the light emitting device 130 is reflected by the first inclined surface 112 and reaches the light diffusing plate 150.
  • the other part of the light emitted from the light emitting device 130 is reflected on the bottom surface 111a and reaches the light diffusing plate 150.
  • These lights that have reached the light diffusing plate 150 are further diffused by the light diffusing plate 150 and emitted to the outside. As a result, the light can be distributed over the entire surface of the surface light source device 100.
  • the arrangement of the light emitting device 130 and the arrangement of the second reflecting unit 141B do not match, and the light is reflected in the arrangement direction of the light emitting device 130. Since the rate is not constant, uneven brightness on the light diffusing plate 150 can be suppressed.
  • the surface light source device 200 according to the second embodiment differs from the surface light source device 100 according to the first embodiment only in the number of the light emitting device row 130A and the reflection adjusting unit 141. Therefore, the same configuration as the surface light source device 100 according to the first embodiment is designated by the same reference numerals and the description thereof will be omitted.
  • FIG. 6 is a plan view of the surface light source device 200 from which the light diffusing plate 150 is removed according to the second embodiment.
  • the surface light source device 200 according to the present embodiment includes a housing 110, a substrate 120, a light emitting device row 130A, a reflector 140, and a light diffusing plate 150 (not shown). Have.
  • a plurality of light emitting device rows 130A are arranged along the surface of the substrate 120 in the second direction (X-axis direction) orthogonal to the first direction (Y-axis direction).
  • the number of light emitting device rows 130A is two rows.
  • each of the light emitting devices 130 included in one light emitting device row 130A is any light emitting device included in the other light emitting device row 130A. It does not match 130.
  • the distance between one light emitting device row 130A and another adjacent light emitting device row 130A is not particularly limited. The distance between one light emitting device row 130A and another adjacent light emitting device row 130A is appropriately set according to the size of the light emitting region of the surface light source device 200.
  • the reflector 140 has a plurality of reflection adjusting units 141.
  • two reflection adjustment units 141 are arranged on the bottom surface 111a on both sides of the light flux control member 132 in the direction in which the two emission surfaces of the light flux control member 132 face each other (X-axis direction). Has been done.
  • a plurality of first reflection units 141A and a plurality of second reflection units 141B are alternately arranged in a row in the first direction (see the region wavy by the broken line in FIG. 6). ).
  • a plurality of reflection adjusting units 141 are arranged in the second direction (X-axis direction). When the plurality of reflection adjusting units 141 are viewed along the second direction, each of the plurality of first reflection units 141A and the plurality of second reflection units 141B in one reflection adjustment unit 141 is in the other reflection adjustment unit 141. It does not match each of the plurality of first reflecting portions 141A and the plurality of second reflecting portions 141B.
  • the first reflection unit 141A and the second reflection unit 141B in the one reflection adjustment unit 141 are alternately arranged along the first direction, and the two adjacent light emitting devices 130 in the first direction.
  • the distance between the centers is different from the total repeating length of the adjacent first reflecting portion 141A and second reflecting portion 141B.
  • the distance between the centers of the two adjacent light emitting devices 130 may be shorter or longer than the total repeating length of the adjacent first reflecting unit 141A and the second reflecting unit 141B.
  • the surface light source device 200 according to the present embodiment has the same effect as the surface light source device 100 according to the present embodiment.
  • the surface light source device having the luminous flux control member according to the present invention can be applied to, for example, a backlight of a liquid crystal display device, a signboard, general lighting, and the like.

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  • General Engineering & Computer Science (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

L'objectif de la présente invention est de fournir un dispositif de source de lumière plane avec lequel il est possible de supprimer la visibilité d'une partie lumineuse générée sous la forme d'une bande, et d'améliorer l'uniformité d'une surface d'émission de lumière. Ce dispositif de source de lumière plane comprend un boîtier, une rangée de dispositifs électroluminescents comprenant une pluralité de dispositifs électroluminescents agencés dans une première direction, un panneau réfléchissant comprenant une partie de réglage de réflexion, et un panneau de diffusion de lumière. La partie de réglage de réflexion comprend des premières parties réfléchissantes et des secondes parties réfléchissantes disposées en alternance dans la première direction. Dans la première direction, une distance centre à centre entre deux dispositifs électroluminescents adjacents est différente d'une longueur de répétition totale des premières parties réfléchissantes et des secondes parties réfléchissantes qui sont adjacentes les unes aux autres.
PCT/JP2020/013185 2019-03-27 2020-03-25 Dispositif de source de lumière plane et dispositif d'affichage WO2020196572A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019060678A JP2020161370A (ja) 2019-03-27 2019-03-27 面光源装置および表示装置
JP2019-060678 2019-03-27

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WO2020196572A1 true WO2020196572A1 (fr) 2020-10-01

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Citations (5)

* Cited by examiner, † Cited by third party
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JP2007048883A (ja) * 2005-08-09 2007-02-22 Koha Co Ltd 光方向変換用光学素子、光放射用光源ユニット及びそれを用いた面状発光装置
JP2007080702A (ja) * 2005-09-15 2007-03-29 Nec Lcd Technologies Ltd バックライトユニット
WO2011142170A1 (fr) * 2010-05-14 2011-11-17 シャープ株式会社 Dispositif d'éclairage, dispositif d'affichage, dispositif récepteur de télévision
WO2011148694A1 (fr) * 2010-05-25 2011-12-01 シャープ株式会社 Dispositif d'éclairage, dispositif d'affichage et récepteur de télévision
WO2013031674A1 (fr) * 2011-08-31 2013-03-07 シャープ株式会社 Dispositif d'éclairage, écran et dispositif de réception de télévision

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JP2007048883A (ja) * 2005-08-09 2007-02-22 Koha Co Ltd 光方向変換用光学素子、光放射用光源ユニット及びそれを用いた面状発光装置
JP2007080702A (ja) * 2005-09-15 2007-03-29 Nec Lcd Technologies Ltd バックライトユニット
WO2011142170A1 (fr) * 2010-05-14 2011-11-17 シャープ株式会社 Dispositif d'éclairage, dispositif d'affichage, dispositif récepteur de télévision
WO2011148694A1 (fr) * 2010-05-25 2011-12-01 シャープ株式会社 Dispositif d'éclairage, dispositif d'affichage et récepteur de télévision
WO2013031674A1 (fr) * 2011-08-31 2013-03-07 シャープ株式会社 Dispositif d'éclairage, écran et dispositif de réception de télévision

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