WO2021070343A1 - 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
WO2021070343A1
WO2021070343A1 PCT/JP2019/040093 JP2019040093W WO2021070343A1 WO 2021070343 A1 WO2021070343 A1 WO 2021070343A1 JP 2019040093 W JP2019040093 W JP 2019040093W WO 2021070343 A1 WO2021070343 A1 WO 2021070343A1
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Prior art keywords
light
light emitting
central axis
source device
light source
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PCT/JP2019/040093
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English (en)
Japanese (ja)
Inventor
健介 平加
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株式会社エンプラス
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Priority to PCT/JP2019/040093 priority Critical patent/WO2021070343A1/fr
Publication of WO2021070343A1 publication Critical patent/WO2021070343A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers 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 having potential barriers 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

Definitions

  • the present invention relates to a surface light source device and a display device.
  • a direct type surface light source device may be used as a backlight.
  • a direct type surface light source device having a plurality of light emitting elements has been used as a light source.
  • the direct type surface light source device has a plurality of light emitting elements, a plurality of luminous flux control members (lenses), and a light diffusing plate.
  • the light emitting element is a light emitting diode (LED) such as a white light emitting diode.
  • the plurality of light emitting elements are arranged in a grid pattern on the bottom surface inside the surface light source device.
  • a luminous flux control member that spreads the light emitted from each light emitting element in the surface direction of the substrate is arranged on each light emitting element. The light emitted from the light flux control member is diffused by the light diffusing plate and illuminates the irradiated member (for example, a liquid crystal panel) in a planar manner.
  • the light emitted from the light emitting element via the luminous flux control member is emitted from the light emitting element. It is designed to spread widely in the direction away from the optical axis (horizontal direction).
  • FIG. 1 is a cross-sectional view showing a partial configuration of a conventional surface light source device.
  • the conventional surface light source device 1 includes a light emitting element 2, a first luminous flux control member 3, and a second luminous flux control member 4 (see, for example, Patent Document 1).
  • the first luminous flux control member 3 has an incident surface 3A on which the light emitted from the light emitting element 2 is incident, and an emitting surface 3B on which the light incident on the incident surface 3A is emitted to the outside.
  • the second luminous flux control member 4 has an incident surface 4A on which the light emitted from the first luminous flux control member 3 is incident, and an emitting surface 4B on which the light incident on the incident surface 4A is emitted to the outside.
  • the incident surface 4A of the second luminous flux control member 4 is a concave surface with respect to the light emitting element 2, and is formed so as to face the light emitting surface of the light emitting element 2.
  • the back surface of the second luminous flux control member 4 is in contact with the casing body 5 that holds the light emitting element 2.
  • the light emitted from the light emitting element 2 is incident on the first luminous flux control member 3, is refracted in a direction away from the optical axis LA, and is emitted (dotted line).
  • the light emitted from the first luminous flux control member 3 is incident on the second luminous flux control member 4, is refracted in a direction further away from the optical axis LA, and is emitted (dotted line).
  • the light from the light emitting element 2 can be widely spread in the direction away from the optical axis LA.
  • the local dimming function is a technology that divides the display screen of a display into several sections and adjusts the brightness of the backlight according to the brightness of the image projected in each section. That is, in order to exert the local dimming function, it is necessary to individually control the amount of light emitted from a plurality of light emitting elements constituting the surface light source device. Therefore, it is required that the light emitted from one light emitting element does not excessively overlap with the light emitted from the adjacent light emitting element while expanding the light emitted from the light emitting element.
  • the light emitted from the light emitting element via the luminous flux control member easily spreads appropriately in the vicinity of the optical axis LA of the light emitting element and does not spread too much in the direction away from the optical axis LA (horizontal direction). ..
  • the conventional surface light source device 1 the light emitted from the light emitting element 2 via the second luminous flux control member 4 tends to spread in the direction away from the optical axis LA. Therefore, the light emitted from one light emitting element excessively overlaps with the light emitted from the adjacent light emitting element, and the contrast tends to decrease.
  • Such a surface light source device is not suitable as a surface light source device for a display having a local dimming function, for example.
  • the present invention includes a surface light source device in which the light emitted from the light emitting element appropriately spreads in the vicinity of the optical axis of the light emitting element and does not excessively spread in a position away from the optical axis, and the surface light source device. It is an object of the present invention to provide a display device.
  • the surface light source device includes a substrate, a plurality of light emitting devices arranged on the substrate, a light emitting element, and a plurality of light emitting devices including a light beam control member for controlling light distribution of light emitted from the light emitting element, and the plurality of light emitting devices.
  • the incident surface which is the inner surface of the concave portion
  • the first emitting surface which is arranged on the light diffusing plate side so as to intersect the central axis and is convex toward the light emitting element side, and the first emitting surface so as to surround the first emitting surface.
  • the light source control member has a second light emitting surface that is arranged and is convex toward the light diffusing plate side, and the light emitting center of the light emitting element is located on the central axis of the light source control member.
  • the light diffusing plate is arranged perpendicular to the central axis, and each of the plurality of light emitting devices has a light emission angle ⁇ from the light emitting center of 0 ° or more and less than 80 °.
  • y is the distance from the central axis of the light emitting device at the arrival point on the light diffusing plate of the light beam emitted from the light emitting center of the light emitting device at the light emitting angle ⁇ .
  • P is the distance between the centers of the light emitting device and the light emitting device closest to the light emitting device.
  • 1.0G-1.5G ⁇ 1.5G-2.0G formula (2) [In the above formula (2), 1.0G is a cross section of the surface light source device including the central axis of the light emitting device and the point closest to the central axis of the outer edge of the emitting surface of the light emitting device.
  • the luminance distribution curve corresponding to the luminance distribution on the light diffusing plate it is the inclination of the tangent line at the point of the luminance value corresponding to the position 1.0 times the distance between the centers from the central axis.
  • 1.5G is the slope of the tangent line at the point of the luminance value corresponding to the position 1.5 times the distance between the centers from the central axis in the luminance distribution curve.
  • 2.0G is the slope of the tangent line at the point of the luminance value corresponding to the position 2.0 times the distance between the centers from the central axis in the luminance distribution curve.
  • the display device includes a surface light source device according to the present invention and an irradiated member that is irradiated with light emitted from the surface light source device.
  • the surface light source device In the surface light source device according to the present invention, the light emitted from the light emitting element does not spread excessively to a position away from the optical axis while appropriately spreading near the optical axis of the light emitting element. Therefore, the surface light source device according to the present invention and the display device having the surface light source device are unlikely to generate a bright portion on the irradiated surface.
  • FIG. 1 is a diagram showing a configuration of a conventional surface light source device.
  • 2A and 2B are views showing the configuration of a surface light source device according to an embodiment of the present invention.
  • 3A and 3B are sectional views of a surface light source device according to an embodiment of the present invention.
  • FIG. 4 is a partially enlarged cross-sectional view of the surface light source device according to the embodiment of the present invention.
  • 5A to 5C are views showing the configuration of the luminous flux control member according to the embodiment of the present invention.
  • 6A and 6B are optical path diagrams of the surface light source device.
  • FIG. 7 is a diagram for explaining the features of the surface light source device.
  • 8A and 8B are graphs for explaining the emission angle, the emission angle, and the light ray arrival position.
  • 9A and 9B are graphs for explaining how to obtain the slope.
  • 10A and 10B are other graphs for explaining how to obtain the slope.
  • the surface light source device and the display device according to the present invention will be described in detail with reference to the attached drawings.
  • a typical example of the surface light source device of the present invention a surface light source device in which light emitting devices are arranged in a grid pattern, which is suitable for a backlight of a liquid crystal display device or the like, will be described.
  • FIG. 2A is a plan view of the surface light source device 100 according to the embodiment of the present invention
  • FIG. 2B is a front view
  • 3A is a cross-sectional view taken along the line AA shown in FIG. 2B
  • FIG. 3B is a cross-sectional view taken along the line BB shown in FIG. 2A
  • FIG. 4 is a partially enlarged cross-sectional view of the surface light source device 100.
  • the surface light source device 100 includes a housing 110, a plurality of light emitting devices 200, and a light diffusing plate 120.
  • the surface light source device 100 of the present invention can be applied to a backlight of a liquid crystal display device or the like.
  • the surface light source device 100 can be combined with a display member (irradiated surface) 107 (shown by a dotted line in FIG. 2B) such as a liquid crystal panel to form a display device 100'.
  • a display member (irradiated surface) 107 shown by a dotted line in FIG. 2B
  • the plurality of light emitting devices 200 are arranged on the substrate 210 on the bottom plate 112 of the housing 110 in a grid pattern (in the present embodiment, a square grid pattern).
  • the inner surface of the bottom plate 112 functions as a diffuse reflection surface.
  • the top plate 114 of the housing 110 is provided with an opening.
  • the light diffusing plate 120 is arranged so as to close the opening, and functions as a light emitting surface.
  • the size of the light emitting surface can be, for example, about 400 mm ⁇ about 700 mm.
  • the plurality of light emitting devices 200 are arranged on the substrate 210 at regular intervals. Each of the plurality of substrates 210 is fixed at a predetermined position on the bottom plate 112 of the housing 110. In the present embodiment, a plurality of light emitting devices 200 are arranged so that the light emitting center (light emitting surface) of the light emitting element 220 is located in a square grid pattern. Each of the plurality of light emitting devices 200 has a light emitting element 220 and a light flux control member 300.
  • the light emitting element 220 is a light source of the surface light source device 100 and is mounted on the substrate 210.
  • the light emitting element 220 is a light emitting diode (LED) such as a white light emitting diode.
  • the light emitting element 220 is arranged so that its light emitting center is located on the central axis CA.
  • the luminous flux control member 300 is a light diffusing lens and is fixed on the substrate 210.
  • the luminous flux control member 300 controls the light distribution of the light emitted from the light emitting element 220, and expands the traveling direction of the light toward the surface of the substrate 210.
  • the luminous flux control member 300 is arranged so that the light emitting center of the light emitting element 220 is located on the central axis CA. The detailed structure of the luminous flux control member 300 will be described later.
  • the light diffusing plate 120 is a plate-shaped member having light diffusing properties, and transmits the light emitted from the light emitting device 200 while diffusing it.
  • the light diffusing plate 120 is arranged on the plurality of light emitting devices 200 in parallel with the substrate 210. Further, the light diffusing plate 120 is arranged perpendicular to the optical axis of the light emitting element 220.
  • the light diffusing plate 120 has almost the same size as an irradiated member such as a liquid crystal panel.
  • the light diffusing plate 120 is formed of a light transmitting resin such as polymethyl methacrylate (PMMA), polycarbonate (PC), polystyrene (PS), and styrene / methyl methacrylate copolymer resin (MS).
  • a light transmitting 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
  • fine irregularities are formed on the surface of the light diffusing plate 120, or light diffusing elements such as beads are dispersed inside the light diffusing plate 120.
  • FIG. 5A to 5C are views showing the configuration of the luminous flux control member 300 according to the embodiment of the present invention.
  • 5A is a plan view of the luminous flux control member 300
  • FIG. 5B is a bottom view
  • FIG. 5C is a cross-sectional view cut along a plane including the central axis CA.
  • the luminous flux control member 300 has an incident surface 320, which is an inner surface of the recess 310, and an exit surface 330. Further, the luminous flux control member 300 forms a gap between a flange portion for facilitating the handling of the luminous flux control member 300 and a gap for releasing heat generated from the light emitting element 220 to the outside, and the luminous flux control member 300 is attached to the substrate 210. It may have a leg portion (all not shown) for positioning and fixing to.
  • the plan-view shape of the luminous flux control member 300 in the present embodiment is a substantially square R-chamfered.
  • the luminous flux control member 300 is arranged on the light emitting element 220 so that its central axis CA coincides with the optical axis OA of the light emitting element 220 (see FIG. 4). Further, the luminous flux control member 300 is positioned so that the light emitting center (center of the light emitting surface) of the light emitting element 220 is located at the center of curvature with respect to the curved surface near the top of the incident surface 320, which will be described later, in the direction along the optical axis OA of the light emitting element 220. (See FIG. 4).
  • the incident surface 320 and the exit surface 330 of the light beam control member 300 which will be described later, are rotationally symmetric (the incident surface 320 is circularly symmetric and the exit surface 330 is four times symmetric), and the rotation axis is the optical axis OA of the light emitting element 220. Matches with.
  • the rotation axes of the entrance surface 320 and the exit surface 330 are referred to as "central axis CA of the luminous flux control member".
  • the “optical axis OA of the light emitting element” means a light beam at the center of a three-dimensional emitted light flux from the light emitting element 220.
  • the luminous flux control member 300 can be formed by integral molding.
  • the material of the luminous flux control member 300 may be any material that can pass light of a desired wavelength.
  • the material of the luminous flux control member 300 is a light-transmitting resin such as polymethyl methacrylate (PMMA), polycarbonate (PC), epoxy resin (EP), or silicone resin, or glass.
  • the recess 310 is arranged at the center of the back surface 305 (light emitting element 220 side) so as to intersect the central axis CA (optical axis OA of the light emitting element 220) of the luminous flux control member 300 (see FIG. 5B).
  • the inner surface of the recess 310 functions as an incident surface 320. That is, the incident surface 320 is arranged so as to intersect the central axis CA (optical axis OA).
  • the incident surface 320 controls most of the light emitted from the light emitting element 220 in the traveling direction of the light and causes the incident surface 320 to enter the inside of the luminous flux control member 300.
  • the incident surface 320 intersects with the central axis CA of the luminous flux control member 300, and is rotationally symmetric (circularly symmetric in the present embodiment) with the central axis CA as the rotation axis.
  • the back surface 305 is a flat surface located on the back side of the luminous flux control member 300 and extending in the radial direction from the opening edge of the recess 310.
  • the exit surface 330 is arranged on the front side (light diffusing plate 120 side) of the luminous flux control member 300.
  • the exit surface 330 emits the light incident on the luminous flux control member 300 to the outside while controlling the traveling direction.
  • the exit surface 330 intersects the central axis CA and is rotationally symmetric (circular symmetry in the present embodiment) with the central axis CA as the rotation axis.
  • the exit surface 330 has a first exit surface 330a located in a predetermined range centered on the central axis CA, and a second exit surface 330b continuously formed around the first exit surface 330a.
  • the first exit surface 330a is a curved surface that is convex toward the back (light emitting element 220) side.
  • the magnitude of the curvature of the first exit surface 330a in the first cross section and the curvature of the first exit surface 330a in the second cross section is not particularly limited. In the present embodiment, the curvature of the first exit surface 330a in the first cross section and the curvature of the first exit surface 330a in the second cross section are the same.
  • first cross section is a cross section including the central axis CA and the outer edge of the exit surface 330 that is closest to the central axis CA.
  • second cross section is a cross section including the central axis CA and the outermost edge of the exit surface 330, which is the farthest point from the central axis CA.
  • the "second cross section” is a cross section obtained by rotating the first cross section by 45 ° about the central axis CA.
  • the second exit surface 330b is a smooth curved surface that is located around the first exit surface 330a and is convex toward the front surface (light diffusion plate 120).
  • the second exit surface 330b may have an overhang portion at a position farthest from the central axis in the cross section including the central axis CA.
  • the "overhang portion” means that the outer end portion of the second exit surface 330b in the direction perpendicular to the central axis CA is further than the lower end portion of the second exit surface 330b in the direction along the central axis CA. The part that overhangs to the outside.
  • the second exit surface 330b of the present embodiment is not provided, since the second emission surface 330b has the overhang portion, the angle of the light emitted from the light emitting element 220 with respect to the optical axis OA is large.
  • the light can also be effectively controlled so that it can be effectively used as the light for illuminating the light diffusing plate 120 in the vicinity of the light emitting device 200.
  • the surface light source device 100 the light emitted from each light emitting element 220 is spread by the luminous flux control member 300 so as to illuminate a predetermined range of the light diffusing plate 120.
  • the light that reaches the light diffusing plate 120 from each luminous flux control member 300 passes through the light diffusing plate 120 while being diffused.
  • the surface light source device 100 according to the present invention can uniformly illuminate the surface-shaped irradiated member (for example, a liquid crystal panel).
  • FIGS. 6A and 6B are optical path diagrams of the surface light source devices 100 and 500.
  • FIG. 6A shows an optical path diagram of the surface light source device 100 in the first cross section of the surface light source device 100 according to the present embodiment
  • FIG. 6B shows an optical path diagram of the surface light source device 500 according to the comparative example in the first cross section. The optical path diagram of the surface light source device 500 is shown.
  • FIGS. 6A and 6B are optical path diagrams of the surface light source devices 100 and 500.
  • hatching to the light emitting element 220, the luminous flux control members 300 and 800, and the light diffusing plate 120 is omitted in order to show the optical path.
  • the light rays showing the optical path shown in FIGS. 6A and 6B show the light rays having an emission angle of 0 ° to 80 ° in 5 ° increments.
  • the light emitted from the light emitting element 220 having a relatively small emission angle is spread and the irradiated region formed on the light diffusing plate 120 is formed. It is controlled toward the central part.
  • the light having a large emission angle from the light emitting element 220 is focused and controlled so that the emission angle does not become too large.
  • the light emitted from the light emitting element 220 having a relatively small emission angle is expanded and the irradiated region formed on the light diffusing plate 120 is formed. It is controlled toward the central part.
  • the light having a large emission angle from the light emitting element 220 is controlled so as to be further spread.
  • FIG. 7 is a schematic diagram for explaining the features of the surface light source device 100.
  • FIG. 8A is a graph showing the relationship between the emission angle ⁇ 1 (°) of the light ray L emitted from the emission center of the light emitting element 220 and the emission angle ⁇ 3 (°) of the light ray L emitted from the luminous flux control members 300 and 800.
  • FIG. 8A is a graph showing the relationship between the emission angle ⁇ 1 (°) of the light ray L emitted from the emission center of the light emitting element 220 and the emission angle ⁇ 3 (°) of the light ray L emitted from the luminous flux control members 300 and 800.
  • FIGS. 8A and 8B shows the emission angle ⁇ 1 (°) of the light beam L emitted from the light emitting center of the light emitting element 220 and the distance (mm) of the light ray L reaching on the light diffusing plate 120 from the central axis CA.
  • the solid line in FIGS. 8A and 8B shows the result of the surface light source device 100 according to the present embodiment, and the broken line shows the result of the surface light source device 500 according to the comparative example.
  • the light emitted from the light emitting center of the light emitting element 220 and having a light emitting angle ⁇ of 0 ° or more and less than 80 ° satisfies the following equations (1) and (2). It is necessary.
  • y ⁇ 2P formula (1) 1.0G-1.5G ⁇ 1.5G-2.0G formula (2)
  • y is the distance from the central axis CA of the arrival point of the light ray L emitted from the light emitting center at the light emitting angle ⁇ ( ⁇ 1 in FIG. 7A) on the light diffusing plate 120.
  • y can be obtained by the following formula (1-a).
  • y X1, tan ⁇ 1 ⁇ X2, tan ⁇ 2 + X3, tan ⁇ 3 Equation (1-a)
  • X1 is the distance (height) in the direction along the central axis CA between the light emitting surface of the light emitting element 220 and the incident position of the light ray L emitted (light emitted) from the light emitting element on the incident surface 320.
  • Is. ⁇ 1 is the emission angle (emission angle) of the light ray L after being emitted (emitted) from the emission center of the light emitting element 220.
  • X2 is along the central axis CA between the incident position of the light ray L emitted from the light emitting element 220 on the incident surface 320 and the emitted position of the light ray L traveling in the luminous flux control member 300 on the emitted surface 330.
  • ⁇ 2 is the angle of the light ray L after being incident on the incident surface 320 with respect to the central axis CA.
  • X3 is a direction along the central axis CA between the emission position of the light ray L traveling in the luminous flux control member 300 on the emission surface 330 and the arrival position of the light ray L emitted from the emission surface 330 on the light diffusing plate 120.
  • Distance (height) in. ⁇ 3 is an angle of the light ray L after being emitted from the exit surface 330 with respect to the central axis CA.
  • the P is the central building distance between the light emitting device 200 and the light emitting device 200 closest to the light emitting device 200.
  • the plurality of light emitting devices 200 are arranged so as to be located at the apex of the square lattice. Therefore, the adjacent closest light emitting device 200 means two adjacent light emitting devices 200 arranged on both ends of one side of the square lattice.
  • the light emitting center of the light emitting element 220 is located on the central axis CA of the luminous flux control member 300. Therefore, the center-to-center distance between the adjacent closest light emitting devices 200 is the distance between the adjacent closest central axis CAs, and is also the distance between the adjacent closest light emitting centers.
  • the emission angle ⁇ 3 of the light ray L emitted from the luminous flux control member 300 is 80. It turns out that it is less than °. In particular, the emission angle ⁇ 3 of the light ray L having a large emission angle ⁇ 1 is almost the same. Further, as shown by the solid line in FIG. 8B, in the surface light source device 100 according to the present embodiment, in the range of 0 ° ⁇ ⁇ 1 ⁇ 80 °, the light beam L emitted from the luminous flux control member 300 is larger than that of 2P. You can see that it does not reach far.
  • the emission angle ⁇ 3 of the light ray L emitted from the luminous flux control member 300 is 80. It turns out that it is above °.
  • the light beam L emitted from the luminous flux control member 300 is farther than 2P in the range of 70 ° ⁇ ⁇ 1 ⁇ 80 °. You can see that it will reach.
  • Equation (2) defines the slope at a predetermined point on the luminance distribution curve corresponding to the luminance distribution on the light diffusing plate 120. Here, how to obtain the inclination will be described.
  • FIG. 9A shows the luminance distribution on the light diffuser plate 120 with respect to the cross section of the surface light source device 100 including the central axis CA of the light emitting device 200 and the point closest to the central axis CA of the outer edge of the emission surface 330 of the light emitting device 200.
  • 9B is a graph showing a differential curve corresponding to the first-order differential of a polynomial approximation function representing the luminance distribution curve.
  • the horizontal axis of FIG. 9A shows the distance (mm) from the central axis CA on the light diffusing plate 120, and the vertical axis is a value obtained by normalizing the brightness value.
  • FIG. 9B shows the distance (mm) from the central axis CA on the light diffusing plate 120, and the vertical axis shows the first derivative value of the normalized value of the luminance value.
  • FIG. 10A is a first-order differential value of a value obtained by normalizing the brightness value on the light diffusing plate 120 corresponding to the positions where the distances from the central axis CA are 1.0P, 1.5P, and 2.0P, respectively. It is a graph showing only 0G, 1.5G, 2.0G), and FIG. 10B is a graph showing the difference between 1.0G and 1.5G and the difference between 1.5G and 2.0G.
  • the solid line shows the result of the surface light source device 100 according to the present embodiment
  • the broken line shows the result of the surface light source device 500 according to the comparative example.
  • the slope is the average of the absolute values of the first derivative values corresponding to the distance from the central axis CA (see FIGS. 10A and 9B).
  • the surface light source device 100 according to the present embodiment 1.0G-1.5G ⁇ 1.5G-2.0G, but in the surface light source device 500 according to the comparative example, 1.5G-2.0G ⁇ 1. It is 0.0G-1.5G.
  • This is related to the fact that in the surface light source device 100 according to the present embodiment in FIGS. 6A and 6B, the light beam having a large emission angle ⁇ 1 does not have an excessively large emission angle ⁇ 3.
  • the emission angle ⁇ 1 increases to some extent, the emission angle ⁇ 3 does not increase. As a result, as shown in FIG.
  • the surface light source device 100 is suitable for a surface light source device for a display having a local dimming function.
  • the surface light source device 100 in order to satisfy y ⁇ 2P and 1.0G-1.5G ⁇ 1.5G-2.0G, the surface light source device 100 is appropriately located near the optical axis of the light emitting element 220. It spreads easily and does not spread too much in the direction away from the optical axis LA. Further, in the display device having the surface light source device 100, the generation of bright areas can be suppressed.
  • the luminous flux control member 300 may have legs for positioning and fixing to the substrate 210.
  • the shape of the legs can be appropriately selected within the range in which the above-mentioned functions can be exhibited.
  • the shape of the leg may be columnar or prismatic.
  • Three legs may be arranged on the back surface 305 or four may be arranged so as to surround the incident surface 320.
  • the surface light source device according to the present invention can be applied to, for example, a backlight of a liquid crystal display device, general lighting, or the like.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
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Abstract

L'invention concerne un dispositif de source de lumière plane dans lequel la lumière émise par un élément électroluminescent s'étale, de manière appropriée, à proximité d'un axe optique de l'élément électroluminescent et ne se propage pas, de manière excessive, vers une position éloignée de l'axe optique. Le dispositif de source de lumière plane comprend : un substrat ; une pluralité de dispositifs électroluminescents qui comprennent chacun un élément électroluminescent et un élément de commande de flux lumineux ; et une plaque de diffusion de lumière. Chaque dispositif électroluminescent satisfait y < 2P, et 1,0G -1,5G < 1,5G - 2,0G par rapport à la lumière pour laquelle un angle d'émission de lumière θ à partir d'un centre d'émission de lumière est de 0° à moins de 80°. y est la distance à partir d'un axe central d'un point d'arrivée sur la plaque de diffusion de lumière de rayons lumineux émis à l'angle d'émission de lumière θ. P est la distance entre les centres de dispositifs électroluminescents adjacents qui sont les plus proches les uns des autres. Chacun de 1,0 G, 1,5 G, et 2,0G est une pente d'une tangente à une valeur de luminosité correspondant à une position qui est de 1,0 fois, 1,5 fois, et 2,0 fois la distance entre les centres de l'axe central, dans une courbe de distribution de luminosité correspondant à une distribution de luminosité sur la plaque de diffusion de lumière.
PCT/JP2019/040093 2019-10-10 2019-10-10 Dispositif de source de lumière plane et dispositif d'affichage WO2021070343A1 (fr)

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Citations (7)

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JP2018198284A (ja) * 2017-05-24 2018-12-13 日亜化学工業株式会社 発光装置
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WO2010092632A1 (fr) * 2009-02-12 2010-08-19 パナソニック株式会社 Lentille d'éclairage, dispositif d'émission de lumière, source de lumière locale et dispositif d'affichage à cristaux liquides
JP2015164115A (ja) * 2014-01-28 2015-09-10 株式会社エンプラス 面光源装置および表示装置
WO2017061370A1 (fr) * 2015-10-07 2017-04-13 株式会社エンプラス Élément de commande de flux lumineux, dispositif électroluminescent, dispositif de source de lumière de surface et dispositif d'affichage
WO2018159676A1 (fr) * 2017-03-03 2018-09-07 株式会社エンプラス Dispositif de source de lumière plane et dispositif d'affichage
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US20180347786A1 (en) * 2017-06-05 2018-12-06 Lumileds Holding B.V. Optical lens for extremely thin direct-lit backlight
US20190041029A1 (en) * 2017-08-04 2019-02-07 Lumileds Holding B.V. Extremely wide distribution light-emitting diode (led) lens for thin direct-lit backlight

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