WO2016158243A1 - 光源用レンズ、照明装置および表示装置 - Google Patents
光源用レンズ、照明装置および表示装置 Download PDFInfo
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- WO2016158243A1 WO2016158243A1 PCT/JP2016/057164 JP2016057164W WO2016158243A1 WO 2016158243 A1 WO2016158243 A1 WO 2016158243A1 JP 2016057164 W JP2016057164 W JP 2016057164W WO 2016158243 A1 WO2016158243 A1 WO 2016158243A1
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- light
- light source
- incident
- lens
- source lens
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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
- G02B6/003—Lens or lenticular sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
-
- 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]
-
- 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
- G02B6/0025—Diffusing sheet or layer; Prismatic sheet or layer
Definitions
- the present disclosure relates to a light source lens suitable for a surface light source, an illumination device, and a display device that displays an image using illumination light from such an illumination device.
- a planar luminance distribution as a whole can be obtained by arranging a plurality of LEDs in a direct backlight.
- a light source lens that diffuses the light from the LED as described in Patent Document 1, for example.
- the lens for a light source described in Patent Document 1 has a substantially circular planar shape, and has an action of diffusing light from the central part to the peripheral part in a cross section including the optical axis. For this reason, a substantially circular luminance distribution in which the luminance decreases from the central portion to the peripheral portion is formed by a single light source in which the LED and the light source lens are combined. When a plurality of such light sources are arranged to obtain a planar luminance distribution, it may be difficult to obtain a uniform luminance distribution as a whole.
- a lens for a light source has an incident surface on which light from a light emitting element is incident, and has a diffusing action at the center with respect to incident light incident through the incident surface, and an intermediate portion. And at least one part of the peripheral part is provided with the output surface which has a condensing effect
- An illumination device includes a light emitting element and a light source lens.
- the light source lens includes an incident surface on which light from the light emitting element is incident, and incident light incident through the incident surface.
- the center portion has a diffusing action, and at least a part of the intermediate portion and the peripheral portion includes an exit surface having a light collecting action.
- a display device includes a lighting device having a light emitting element and a light source lens, and a display panel that displays an image based on illumination light from the lighting device, and the light source lens includes: An exit surface on which light from the light emitting element is incident and an exit surface that has a diffusing action in the central portion and incident light that is condensed through at least a part of the intermediate portion and the peripheral portion with respect to incident light incident through the incident surface. And a surface.
- incident light is diffused in the central portion and condensed in at least a part of the intermediate portion and the peripheral portion on the exit surface.
- the incident light is diffused in the central portion and condensed in at least a part of the intermediate portion and the peripheral portion on the emission surface.
- the non-uniformity of the luminance distribution can be improved.
- FIG. 3 is a cross-sectional view showing a configuration example of a light source lens in a ZX-Y1 cross section in FIG. 2.
- FIG. 3 is a cross-sectional view illustrating a configuration example of a light source lens in a ZX-Y2 cross section in FIG. 2.
- FIG. 5 is a configuration diagram in which the cross section of FIG. 3 and the cross section of FIG. 4 are overlapped. It is a top view which shows the planar structure which looked at the lens for light sources shown in FIG. 1 from the upper side.
- FIG. 5 is a characteristic diagram illustrating an example of a luminance distribution in the X direction when a substantially square luminance distribution is formed on a predetermined irradiation surface by the light source lens illustrated in FIG. 1.
- FIG. 6 is a characteristic diagram illustrating an example of a luminance distribution in a diagonal direction when a substantially square luminance distribution is formed on a predetermined irradiation surface by the light source lens illustrated in FIG. 1.
- FIG. 31 is a cross-sectional view illustrating a configuration example of a display unit in the display device illustrated in FIG. 30. It is a perspective view which shows one structural example of the lens for light sources which concerns on other embodiment.
- FIG. 33 is a plan view and a side view showing a configuration example of a light source lens shown in FIG. 32. It is sectional drawing which shows one structural example of the lens for light sources shown in FIG.
- Explanation of light source lens> [1.1 Configuration] 1 to 6 show a configuration example of a light source lens 1 according to an embodiment of the present disclosure. 1 to 6, the Z axis is the optical axis Z1, and the plane perpendicular to the optical axis Z1 is the XY plane.
- FIG. 1 and FIG. 2 show an example of the configuration of the light source lens 1 viewed from an oblique direction.
- FIG. 3 shows an example of a cross-sectional configuration of the light source lens 1 in the ZX-Y1 cross section in FIG.
- FIG. 4 shows an example of a cross-sectional configuration of the light source lens 1 in the ZX-Y2 cross section in FIG.
- FIG. 5 shows an example of a cross-sectional configuration in which the cross section of FIG. 3 and the cross section of FIG. 4 are overlapped.
- FIG. 6 shows an example of a planar configuration when the light source lens 1 is viewed from above.
- the light source lens 1 is provided, for example, with respect to the light emitting element 2 arranged on the substrate 3 as shown in FIG.
- the light emitting element 2 is a point light source, for example, and is specifically configured by an LED.
- the light source lens 1 includes a mounting portion 5 on the bottom surface, and is disposed on the substrate 3 with a space therebetween via the mounting portion 5.
- the light emitting element 2 is disposed between the bottom surface of the light source lens 1 and the substrate 3.
- the light source lens 1 includes an incident surface 10 on which light from the light emitting element 2 is incident, and an output surface 20 that emits incident light incident through the incident surface 10 to the outside. As shown in FIGS. 1 and 6, the light source lens 1 has four corners 4A, 4B, 4B, 4B, 4B, 4B, 4B, 4B, and 4B that are rounded when the outer shape including the entrance surface 10 and the exit surface 20 is viewed from the optical axis direction. 4C and 4D, and it has a quadrangular shape having four straight side portions 6A, 6B, 6C, and 6D.
- the incident surface 10 is formed on the bottom surface of the light source lens 1. As shown in FIG. 3, the incident surface 10 has a concave central portion 11 and has a diffusing action on the light from the light emitting element 2.
- the emission surface 20 is formed on the upper surface of the light source lens 1.
- the exit surface 20 has a diffusing action at the central portion 21 with respect to incident light incident through the entrance surface 10.
- At least a part of the peripheral portion 23 and the intermediate portion 22 has a light collecting action.
- the central portion 21 has a concave shape having a diffusing action with respect to incident light.
- the intermediate portion 22 has an aspheric shape having a condensing function with respect to incident light. As shown in FIGS. 1 and 6, the central portion 21 and the intermediate portion 22 have a circular planar shape when viewed from the optical axis direction.
- the peripheral part 23 has a flat part 24, a recessed part 25 having a condensing effect on incident light, and a curved part 26.
- the peripheral portion 23 has a quadrangular shape having four rounded corner portions 4A, 4B, 4C, 4D and four straight side portions 6A, 6B, 6C, 6D when viewed from the optical axis direction. It has become.
- the recess 25 is formed in the vicinity of the four corners 4A, 4B, 4C, 4D.
- the hollow portion 25 has a shape that is inclined in a curved shape with respect to the flat portion 24.
- the flat portion 24 is formed in the vicinity of the four corner portions 4A, 4B, 4C, 4D other than the hollow portion 25 and in the vicinity of the four side portions 6A, 6B, 6C, 6D.
- the light source lens 1 has two functions of diffusion and condensing, in which light is condensed at the intermediate portion 22 and the peripheral portion 23 while diffusing the light in the concave shape of the central portion 21 on the emission surface 20. ing.
- FIG. 7 shows the light diffusing action and the light collecting action at the central portion 21 and the intermediate portion 22 by the light source lens 1 shown in FIG.
- the light source lens 1 has a diffusing action on the light beams L ⁇ b> 1 and L ⁇ b> 2 that pass through the central portion 21 on the emission surface 20. Moreover, it has a condensing effect
- FIG. As a result, there is a region where the light beam L2 that has passed through the central portion 21 and the light beam L3 that has passed through the intermediate portion 22 intersect between the predetermined irradiation surface 30 and the emission surface 20.
- FIG. 8 shows a configuration example of the light source lens 101 according to the first comparative example.
- FIG. 9 shows the light diffusing action of the light source lens 101 according to the first comparative example.
- the light source lens 101 is, for example, a light emitting element disposed on the substrate 3 in the same manner as the light source lens 1. 2 is provided.
- the light source lens 101 includes a mounting portion 105 on the bottom surface, and is disposed on the substrate 3 with a space therebetween via the mounting portion 105.
- the light emitting element 2 is disposed between the bottom surface of the light source lens 101 and the substrate 3.
- the light source lens 101 includes an incident surface 110 on which light from the light emitting element 2 is incident, and an output surface 120 that emits incident light incident through the incident surface 110 to the outside.
- the light source lens 101 has a circular outer shape including the entrance surface 110 and the exit surface 120 when viewed from the optical axis direction.
- the incident surface 110 has a concave central portion 111 and has a diffusing action on the light from the light emitting element 2.
- the exit surface 120 has a diffusing action at the central portion 121, the intermediate portion 122, and the peripheral portion 23 with respect to incident light incident through the incident surface 110.
- FIG. 10 shows the light condensing action in the recess 25 of the light source lens 1.
- FIG. 11 shows the light diffusing action of the light source lens 201 according to the second comparative example.
- the light source lens 201 shown in FIG. 11 has no recess 25 in the vicinity of the four corners 4A, 4B, 4C, and 4D and is a flat part 24 as compared with the light source lens 1 according to the present embodiment. This is a configuration example.
- the exit surface 20 has a diffusing action with respect to the light beam L10 passing through the four corner portions 4A, 4B, 4C, and 4D.
- the exit surface is provided with respect to the light ray L10 which passes the four corner
- FIG. 20 has a condensing effect.
- a substantially square luminance distribution can be formed on the predetermined irradiation surface 30 by the light emitted from the emission surface 20.
- FIG. 12 shows an example of the illuminance distribution in the ZX cross section including the optical axis Z of the light emitting element 2 alone.
- FIG. 13 shows an example of the luminance distribution of the light emitting element 2 alone on the predetermined irradiation surface 30. As shown in FIG. 13, a substantially circular luminance distribution is formed by the light emitting element 2 alone.
- FIG. 14 shows an example of the illuminance distribution in the ZX cross section including the optical axis Z formed by the light source lens 1.
- FIG. 15 shows an example of the luminance distribution on the predetermined irradiation surface 30 formed by the light source lens 1. As shown in FIG. 15, the light source lens 1 can bring the substantially circular luminance distribution closer to the substantially square luminance distribution.
- FIG. 16 shows an example of the luminance distribution on the predetermined irradiation surface 30 formed by the light source lens 1.
- FIG. 17 shows an example of the luminance distribution in the diagonal direction shown in FIG.
- FIG. 18 shows an example of the luminance distribution on the predetermined irradiation surface 30 formed by the light source lens 201 (a configuration in which the hollow portion 25 is not provided) according to the second comparative example shown in FIG. ing.
- FIG. 19 shows an example of the luminance distribution in the diagonal direction shown in FIG. *
- the position where the peak luminance a is 1 ⁇ 4 in the diagonal direction is ⁇ 28 mm from the center.
- the position where the luminance at the central portion is substantially flat in the diagonal direction.
- the position where the peak luminance a becomes 1 ⁇ 4 in the diagonal direction is ⁇ from the center.
- the position is 26 mm.
- the light source lens 201 there is no region where the luminance is substantially flat compared to the light source lens 1.
- FIG. 20 shows an example of the luminance distribution in the X direction when the light source lens 1 forms a substantially square luminance distribution as shown in FIG. 16 on the predetermined irradiation surface 30.
- FIG. 21 shows an example of the luminance distribution in the diagonal direction when the substantially rectangular luminance distribution as shown in FIG. 16 is formed on the predetermined irradiation surface 30 by the light source lens 1.
- the position where the peak luminance a is halved in the X direction is preferably a position ⁇ 20 mm from the center.
- the position where the peak luminance a is 1 ⁇ 4 in the diagonal direction may be set to a position of ⁇ 28 mm from the center.
- a backlight of a display device may be configured by using a plurality of light emitting elements 2 and light source lenses 1. Further, when applied to a backlight of a display device, it is conceivable to perform partial driving for independently controlling light emission of a plurality of light emitting elements 2.
- FIG. 22 shows an example in which a plurality of light emitting elements 2 and light source lenses 1 are arranged to form a substantially uniform luminance distribution on a predetermined irradiation surface 30.
- One luminance distribution 31 is formed by a combination of one light emitting element 2 and one light source lens 1.
- the luminance is 1/2 or 1 from the peak luminance a as shown in FIGS.
- the rate at which the brightness decreases to / 4 is defined as an angle ⁇ .
- the angle ⁇ can be optimized as appropriate depending on the shape of the emission surface 20 of the light source lens 1 and the like. Further, for example, when applied to a backlight of a display device, the angle ⁇ may be optimized according to the effect of partial driving and video display preference. For example, if the angle ⁇ is too small, the illumination range by one light source lens 1 is too wide, and the effect of partial driving may be reduced due to the balance with the illumination range of the adjacent light source lens 1. Further, for example, if the angle ⁇ is too large, it may be difficult to control the video display as desired.
- FIG. 23 shows an example in which a plurality of light source lenses 1 are arranged to form a substantially square synthetic luminance distribution on a predetermined irradiation surface 30. Since a substantially square luminance distribution 40 is obtained by combining one light emitting element 2 and one light source lens 1, a plurality of light emitting elements 2 and light source lenses 1 are arranged in a square shape to obtain a predetermined irradiation surface. At 30, the combined luminance distribution having a substantially rectangular shape as a whole can be formed. In this case, since the luminance distribution 40 by one light source lens 1 is substantially quadrangular, the luminance nonuniformity portion 41 can be reduced as a whole.
- FIG. 24 shows an example of a combined luminance distribution formed when a plurality of light source lenses 101 according to the first comparative example shown in FIG. 8 are arranged in a square array.
- a substantially circular luminance distribution 50 is formed by a combination of one light emitting element 2 and one light source lens 101.
- FIG. 25 shows an example of a combined luminance distribution formed when a plurality of light source lenses 101 according to the first comparative example are arranged in a staggered arrangement.
- the staggered arrangement can reduce the area where the non-uniform luminance portion 51 is formed as compared with the square arrangement.
- the light source lens 1 according to the present embodiment shown in FIG. 23 is used. Compared with the non-uniform luminance portion 41, the area becomes larger.
- the incident light is diffused in the central portion 21 and condensed in at least a part of the intermediate portion 22 and the peripheral portion 23 on the emission surface 20.
- Non-uniformity can be improved.
- the light source lens 1 By using the light source lens 1 according to the present embodiment, it is possible to realize a surface light source with less luminance unevenness with a small number of light emitting elements 2. In addition, by appropriately optimizing the magnification of the lens, the illumination range by one light source lens 1 can be expanded, and the number of light emitting elements 2 can be reduced. Further, the light source lens 1 suppresses the spread of light, unlike the case of the light emitting element 2 alone or a lens of the type that diffuses to the periphery, such as the light source lens 101 according to the first comparative example shown in FIG. Therefore, for example, even when a plurality of light emitting elements 2 are arranged and partial driving is performed such that only some of the light emitting elements 2 emit light, the contrast ratio can be improved.
- FIG. 26 shows a configuration example of the light source lens 1 ⁇ / b> A according to the first modification viewed from an oblique direction.
- FIG. 27 shows an example of a planar configuration when the light source lens 1A is viewed from the upper side and an example of a configuration when viewed from the side surface direction.
- the light source lens 1A according to the first modification is different in the configuration of the four corner portions 4A, 4B, 4C, and 4D from the configuration of the light source lens 1 shown in FIGS.
- the outer shape including the entrance surface 10 and the exit surface 20 is a shape having four rounded corners 4 ⁇ / b> A, 4 ⁇ / b> B, 4 ⁇ / b> C, 4 ⁇ / b> D when viewed from the optical axis direction.
- the peripheral part 23 is set as the structure which has the curved part 26 in four corner
- the light source lens 1A according to the first modification has a configuration in which the curved portions 26 are not provided in the four corner portions 4A, 4B, 4C, and 4D.
- the external shape containing the entrance plane 10 and the output surface 20 is not rounded when it sees from an optical axis direction, 4 corner
- the shape has 4C and 4D.
- FIG. 28 shows a configuration example of the light source lens 1 ⁇ / b> B according to the second modification viewed from an oblique direction.
- FIG. 29 shows an example of a planar configuration when the light source lens 1B is viewed from the upper side and an example of a configuration when viewed from the side surface direction.
- the light source lens 1B according to the second modified example has a configuration in which the curved portions 26 are not provided in the four corners 4A, 4B, 4C, and 4D.
- the outer shape including the entrance surface 10 and the exit surface 20 is a shape having four corners 4A, 4B, 4C, and 4D that are not rounded when viewed from the optical axis direction.
- the shape of the recess 25 is different from the configuration of the light source lens 1 shown in FIGS.
- the recess 25 has a shape inclined in a curved line with respect to the flat part 24 as shown in FIGS. 1 and 4.
- the recessed portion 25 has a shape inclined linearly with respect to the flat portion 24.
- Example of application to display device> It is possible to configure an illumination device using the light source lens 1, 1A, or 1B. Further, it is possible to display an image using illumination light from such an illumination device.
- FIG. 30 shows a configuration example of the display device 301.
- the display device 301 includes a display unit 302 and a stand 303.
- the display unit 302 includes, for example, a lighting device 310, a display panel 311 and an optical sheet 312 as shown in FIG.
- the display panel 311 is, for example, a transmissive liquid crystal display panel, and displays an image based on illumination light from the illumination device 310 using the illumination device 310 as a backlight.
- the illuminating device 310 is a planar light source. For example, as shown in FIGS. 22 and 23, a plurality of light-emitting elements 2 arranged in a matrix and a plurality of light-emitting elements 2 are respectively arranged in a matrix. It includes a plurality of light source lenses 1 arranged.
- the optical sheet 312 is disposed between the lighting device 310 and the display panel 311.
- the optical sheet 312 is composed of, for example, a sheet or film for improving luminance.
- the optical sheet 312 may include, for example, a prism sheet.
- the optical sheet 312 may also include a reflective polarizing film such as DBEF (Dual Brightness Enhancement Film).
- the cross section in the X direction and the cross section in the Y direction are substantially symmetrical, but the cross section in the X direction and the cross section in the Y direction are asymmetric. It may be.
- FIG. 32 shows an example of the configuration of a light source lens 1C according to another embodiment viewed from an oblique direction.
- FIG. 33 shows an example of a planar configuration when the light source lens 1C is viewed from the upper side and an example of a configuration when viewed from the side surface direction.
- FIG. 34 shows an example of a cross-sectional configuration of the light source lens 1C.
- the light source lens 1C is different from the light source lens 1 shown in FIGS. 1 to 6 in the configuration of the peripheral portion 23A.
- the curved portions 26 at the four corner portions 4A, 4B, 4C, and 4D are linear portions 27 that are formed in a straight line.
- the outer shape including the incident surface 10 and the emission surface 20 is substantially octagonal when viewed from the optical axis direction as shown in FIG.
- the light source lens 1C has a shape in which the flat portion 24 in the peripheral portion 23 is eliminated and the substantially entire region of the peripheral portion 23A is inclined with respect to the configuration of the light source lens 1 shown in FIGS. .
- the recessed part 25 is formed in four corner
- the recessed part 28 is formed also in four side part 6A, 6B, 6C, 6D.
- the recesses 25 and 28 may have a curved and inclined shape, or may have a linearly inclined shape as in the light source lens 1B according to the second modification. May be.
- the light source lens 1C may have a size in which the diameter Xa in the X direction is different from the diameter Ya in the Y direction.
- this technique can take the following composition.
- a light source lens comprising: an exit surface that has a diffusing action at a central portion and a condensing action at least at a part of an intermediate portion and a peripheral portion with respect to incident light incident through the incident surface.
- the central portion is a concave shape having a diffusion effect on incident light
- the intermediate portion has an aspherical shape having a condensing function with respect to the incident light
- the said peripheral part has a flat part and the hollow part which has a condensing effect
- the lens for light sources as described in said (1).
- the peripheral portion is a quadrilateral shape having four corner portions or a quadrangular shape having four rounded corner portions when viewed from the optical axis direction,
- the light source lens according to (2) wherein the recess is formed in the vicinity of the corner.
- the center part and the intermediate part have a circular planar shape when viewed from the optical axis direction.
- the outer shape including the entrance surface and the exit surface is a quadrangular shape having four corners or a quadrangular shape having four rounded corners when viewed from the optical axis direction.
- the light source lens according to any one of (5). (7) The light source lens according to any one of (1) to (6), wherein a square luminance distribution is formed on a predetermined irradiation surface by light emitted from the emission surface.
- a light emitting element Including a lens for a light source, The light source lens is: An incident surface on which light from the light emitting element is incident; An illuminating device comprising: an exit surface having a diffusing action at a central portion and a condensing effect at least at a part of an intermediate portion and a peripheral portion with respect to incident light incident through the incident surface.
- a plurality of the light emitting elements including a plurality of light source lenses provided for each of the plurality of light emitting elements.
- An illumination device having a light emitting element and a light source lens;
- a display panel that displays an image based on illumination light from the illumination device, and
- the light source lens is: An incident surface on which light from the light emitting element is incident;
- a display device comprising: an exit surface that has a diffusing action at a central portion and a condensing effect at least at a part of an intermediate portion and a peripheral portion with respect to incident light incident through the incident surface.
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Abstract
Description
なお、ここに記載された効果は必ずしも限定されるものではなく、本開示中に記載されたいずれかの効果であってもよい。
1.光源用レンズの説明
1.1 構成(図1~図6)
1.2 作用(図7~図25)
1.3 効果
2.変形例
2.1 第1の変形例(図26、図27)
2.2 第2の変形例(図28、図29)
3.表示装置への適用例(図30、図31)
4.その他の実施の形態(図32~図34)
[1.1 構成]
図1~図6は、本開示の一実施の形態に係る光源用レンズ1の一構成例を示している。なお、図1~図6において、Z軸を光軸Z1とし、光軸Z1に垂直な平面をXY平面とする。
(光源用レンズ1における拡散作用および集光作用の説明)
光源用レンズ1は、出射面20における中心部21の凹形状で光を拡散させながら、中間部22と周辺部23とで光を集光させるという、拡散と集光との2つの機能を持っている。
本実施の形態に係る光源用レンズ1では、出射面20から出射された光によって、所定の照射面30において略四角形状の輝度分布を形成することができる。
発光素子2と光源用レンズ1とを複数用いて例えば表示装置のバックライトを構成することが考えられる。また、表示装置のバックライトに適用する場合、複数の発光素子2を独立に発光制御する部分駆動を行うことが考えられる。
以上のように、本実施の形態によれば、出射面20において、入射光を中心部21では拡散し、中間部22および周辺部23の少なくとも一部では集光するようにしたので、輝度分布の不均一性を改善することができる。
次に、上記光源用レンズ1の変形例について説明する。以下では、上記光源用レンズ1と同様の構成および作用を有する部分については、適宜説明を省略する。
図26は、第1の変形例に係る光源用レンズ1Aを斜め方向から見た一構成例を示している。図27は、光源用レンズ1Aを上側から見た平面構成の一例と、側面方向から見た構成の一例とを示している。
図28は、第2の変形例に係る光源用レンズ1Bを斜め方向から見た一構成例を示している。図29は、光源用レンズ1Bを上側から見た平面構成の一例と、側面方向から見た構成の一例とを示している。
上記光源用レンズ1、1A、または1Bを用いて照明装置を構成することが可能である。また、そのような照明装置による照明光を用いて画像表示を行うことが可能である。
本開示による技術は、上記実施の形態の説明に限定されず種々の変形実施が可能である。
(1)
発光素子からの光が入射する入射面と、
前記入射面を介して入射した入射光に対して、中心部では拡散作用を有し、中間部および周辺部の少なくとも一部では集光作用を有する出射面と
を備える光源用レンズ。
(2)
前記出射面において、
前記中心部は入射光に対して拡散作用を有する凹形状であり、
前記中間部は、前記入射光に対して集光作用を有する非球面形状であり、
前記周辺部は、平坦部と前記入射光に対して集光作用を有する窪み部とを有する
上記(1)に記載の光源用レンズ。
(3)
前記周辺部は、光軸方向から見たときの平面形状が、4つの角部を有する四角形状、または丸められた4つの角部を有する四角形状であり、
前記窪み部は、前記角部付近に形成されている
上記(2)に記載の光源用レンズ。
(4)
前記中心部および前記中間部は、光軸方向から見たときの平面形状が円形状である
上記(2)または(3)に記載の光源用レンズ。
(5)
前記入射面は、前記発光素子からの光に対して拡散作用を有する非球面形状である
上記(1)ないし(4)のいずれか1つに記載の光源用レンズ。
(6)
前記入射面および前記出射面を含む外形形状が、光軸方向から見たときに、4つの角部を有する四角形状、または丸められた4つの角部を有する四角形状である
上記(1)ないし(5)のいずれか1つに記載の光源用レンズ。
(7)
前記出射面から出射された光によって、所定の照射面において四角形状の輝度分布を形成する
上記(1)ないし(6)のいずれか1つに記載の光源用レンズ。
(8)
発光素子と、
光源用レンズと
を含み、
前記光源用レンズは、
前記発光素子からの光が入射する入射面と、
前記入射面を介して入射した入射光に対して、中心部では拡散作用を有し、中間部および周辺部の少なくとも一部では集光作用を有する出射面と
を備える照明装置。
(9)
複数の前記発光素子と、
複数の前記発光素子のそれぞれに対して設けられた複数の前記光源用レンズと
を含む
上記(8)に記載の照明装置。
(10)
複数の前記光源用レンズのそれぞれの出射面から出射された光の合成光によって、所定の照射面において四角形状の合成の輝度分布を形成する
上記(9)に記載の照明装置。
(11)
発光素子と光源用レンズとを有する照明装置と、
前記照明装置からの照明光に基づいて画像を表示する表示パネルと
を含み、
前記光源用レンズは、
前記発光素子からの光が入射する入射面と、
前記入射面を介して入射した入射光に対して、中心部では拡散作用を有し、中間部および周辺部の少なくとも一部では集光作用を有する出射面と
を備える表示装置。
Claims (11)
- 発光素子からの光が入射する入射面と、
前記入射面を介して入射した入射光に対して、中心部では拡散作用を有し、中間部および周辺部の少なくとも一部では集光作用を有する出射面と
を備える光源用レンズ。 - 前記出射面において、
前記中心部は入射光に対して拡散作用を有する凹形状であり、
前記中間部は、前記入射光に対して集光作用を有する非球面形状であり、
前記周辺部は、平坦部と前記入射光に対して集光作用を有する窪み部とを有する
請求項1に記載の光源用レンズ。 - 前記周辺部は、光軸方向から見たときの平面形状が、4つの角部を有する四角形状、または丸められた4つの角部を有する四角形状であり、
前記窪み部は、前記角部付近に形成されている
請求項2に記載の光源用レンズ。 - 前記中心部および前記中間部は、光軸方向から見たときの平面形状が円形状である
請求項2に記載の光源用レンズ。 - 前記入射面は、前記発光素子からの光に対して拡散作用を有する非球面形状である
請求項1に記載の光源用レンズ。 - 前記入射面および前記出射面を含む外形形状が、光軸方向から見たときに、4つの角部を有する四角形状、または丸められた4つの角部を有する四角形状である
請求項1に記載の光源用レンズ。 - 前記出射面から出射された光によって、所定の照射面において四角形状の輝度分布を形成する
請求項1に記載の光源用レンズ。 - 発光素子と、
光源用レンズと
を含み、
前記光源用レンズは、
前記発光素子からの光が入射する入射面と、
前記入射面を介して入射した入射光に対して、中心部では拡散作用を有し、中間部および周辺部の少なくとも一部では集光作用を有する出射面と
を備える照明装置。 - 複数の前記発光素子と、
複数の前記発光素子のそれぞれに対して設けられた複数の前記光源用レンズと
を含む
請求項8に記載の照明装置。 - 複数の前記光源用レンズのそれぞれの出射面から出射された光の合成光によって、所定の照射面において四角形状の合成の輝度分布を形成する
請求項9に記載の照明装置。 - 発光素子と光源用レンズとを有する照明装置と、
前記照明装置からの照明光に基づいて画像を表示する表示パネルと
を含み、
前記光源用レンズは、
前記発光素子からの光が入射する入射面と、
前記入射面を介して入射した入射光に対して、中心部では拡散作用を有し、中間部および周辺部の少なくとも一部では集光作用を有する出射面と
を備える表示装置。
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US15/559,125 US10852456B2 (en) | 2015-03-31 | 2016-03-08 | Light source lens, illumination unit, and display unit |
JP2017509460A JP6798980B2 (ja) | 2015-03-31 | 2016-03-08 | 光源用レンズ、照明装置および表示装置 |
EP16772127.3A EP3279555B1 (en) | 2015-03-31 | 2016-03-08 | Lens for light source, illumination device, and display device |
US17/081,009 US11262483B2 (en) | 2015-03-31 | 2020-10-27 | Light source lens, illumination unit, and display unit |
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US11262483B2 (en) | 2022-03-01 |
US10852456B2 (en) | 2020-12-01 |
JP6798980B2 (ja) | 2020-12-09 |
JPWO2016158243A1 (ja) | 2018-01-25 |
US11513261B2 (en) | 2022-11-29 |
JP2021043461A (ja) | 2021-03-18 |
US20220179128A1 (en) | 2022-06-09 |
JP7138688B2 (ja) | 2022-09-16 |
EP3279555B1 (en) | 2021-09-01 |
EP3279555A1 (en) | 2018-02-07 |
US20210103074A1 (en) | 2021-04-08 |
EP3279555A4 (en) | 2018-12-05 |
US20180245769A1 (en) | 2018-08-30 |
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CN107407473B (zh) | 2020-08-28 |
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