WO2010058845A1 - 面光源装置及びそれに用いる導光体 - Google Patents
面光源装置及びそれに用いる導光体 Download PDFInfo
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- WO2010058845A1 WO2010058845A1 PCT/JP2009/069728 JP2009069728W WO2010058845A1 WO 2010058845 A1 WO2010058845 A1 WO 2010058845A1 JP 2009069728 W JP2009069728 W JP 2009069728W WO 2010058845 A1 WO2010058845 A1 WO 2010058845A1
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- WIPO (PCT)
- Prior art keywords
- light
- light source
- source device
- light guide
- lens array
- Prior art date
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Classifications
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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
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
- F21K9/61—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using light guides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
- F21K9/69—Details of refractors forming part of the light source
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
- F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
Definitions
- the present invention relates to an edge light type surface light source device and a light guide used to constitute the light source, and the light guide is, for example, a monitor such as a portable notebook personal computer or a display unit such as a liquid crystal television. It is suitable for a backlight of a liquid crystal display device used as the above.
- the liquid crystal display device basically includes a backlight and a liquid crystal display element.
- a backlight an edge light type is often used from the viewpoint of making the liquid crystal display device compact.
- an edge-light type backlight at least one end surface of a rectangular plate-shaped light guide is used as a light incident end surface, and a linear or rod-shaped primary light source such as a straight tube fluorescent lamp along the light incident end surface
- the light emitted from the primary light source is introduced from the light incident end surface of the light guide into the light guide, and emitted from the light exit surface that is one of the two main surfaces of the light guide. I try to let them.
- a light emitting diode (LED) that is a point light source is used as a primary light source of a backlight.
- LED light emitting diode
- As a backlight using an LED as a primary light source for example, as described in Japanese Patent Application Laid-Open No. 7-270624 (Patent Document 1), the same function as that using a linear primary light source is exhibited.
- a plurality of LEDs are arranged one-dimensionally along the light incident end face of the light guide.
- such a point primary light source is used not only in a small liquid crystal display device but also in a monitor such as a portable notebook personal computer, a display unit such as a liquid crystal television, and other relatively large liquid crystal display devices. .
- Patent Document 2 a light guide having a rough light exit surface is used, and a prism sheet in which a large number of prism rows are arranged is guided so that the prism surface is on the light guide side.
- a method of narrowing the distribution of emitted light has been proposed that is arranged on the light emitting surface of the light body to suppress the power consumption of the backlight and to minimize the luminance.
- luminance unevenness is easily visible through the prism sheet.
- Patent Document 3 describes that the surface of the prism array formed by the light guide is roughened or the linear shape of the prism array is deformed. It has been proposed to form a curved lens array.
- Patent Document 4 Japanese Patent Application Laid-Open No. 2006-171253 (Patent Document 4) and Japanese Patent Application Laid-Open No. 2006-261644 (Patent Document 5) describe that a part of one surface of the light guide is substantially along the traveling direction of light from the incident end surface.
- Patent Document 5 A technique for reducing unevenness in brightness by forming a plurality of grooves in a different direction is disclosed.
- JP 7-270624 A Japanese Patent Publication No. 7-27137 JP 2004-6326 A JP 2006-171253 A Japanese Patent Laid-Open No. 2006-261064
- Patent Document 4 and Patent Document 5 the groove shape is not optimized, and the luminance unevenness has not been fundamentally eliminated.
- a surface light source device in which a prism sheet in which a large number of prism rows are arranged is arranged on a light output surface of a light guide (particularly, the prism surface of the prism sheet is guided so as to be on the light guide side).
- a spot-like high-luminance portion in a high-luminance surface light source device arranged on the light emitting surface of a light body
- HotSpot spot-like high-luminance portion that appears corresponding to uneven luminance, particularly a point-like light source such as an LED.
- a plurality of first lenses extending substantially along a direction perpendicular to the boundary between the one surface and the light incident end surface on one of the light emitting surface and the back surface, and arranged substantially parallel to each other A column is formed,
- the incident side edge the other surface of the light exit surface and the back surface extends substantially along a direction perpendicular to the boundary between the other surface and the light incident end surface, and is substantially parallel to each other.
- a plurality of arranged second lens rows are formed,
- the ratio A / T of the dimension A of the incident side edge in the direction perpendicular to the boundary between the other surface and the light incident end surface with respect to the thickness T of the light guide at the incident side edge is 5
- the second lens array has a dimension in a direction perpendicular to the boundary between the other surface and the light incident end surface that is 50% or more of the dimension A of the incident side edge portion.
- the lens surfaces constituting the second lens array are roughened and an average inclination angle measured along the extending direction of the second lens array is 0.1. Within the range of -8 degrees.
- the region where the second lens row is formed is a part of the other surface, and the second lens row is partially formed on the second surface of the other surface. It is located closer to the one surface than the region other than the region where the lens array is formed.
- the region where the second lens array is formed is a part of the other surface, and the second lens array is entirely formed of the second surface of the other surface. It is located closer to the one surface than the region other than the region where the lens array is formed.
- the light guide for the surface light source device the primary light source disposed adjacent to the light incident end surface of the light guide, and the light deflection disposed adjacent to the light exit surface of the light guide.
- a surface light source device comprising an element, An incident-side edge portion of the light guide for the surface light source device is located outside an effective display region corresponding to an effective display region of a display device formed using the surface light source device.
- the light deflection element has a light incident surface located opposite to the light exit surface of the light guide and a light exit surface on the opposite side.
- a plurality of prism rows arranged in parallel with each other along the light incident end face are formed.
- a display device comprising: the above surface light source device; and a display element arranged so that light emitted from the surface light source device arrives, A display device, wherein an incident-side edge portion of the light guide for the surface light source device is located outside an effective display area of the display device; Is provided.
- the light guide for a surface light source device of the present invention it is possible to eliminate luminance unevenness and manufacture a high-quality surface light source device and further a display device.
- FIG. 1 is a schematic partially transparent perspective view showing an embodiment of a surface light source device according to the present invention
- FIG. 2 is a schematic partially exploded perspective view thereof.
- the surface light source device of the present embodiment includes a plurality of LEDs 2 as point-like primary light sources arranged at an appropriate distance in the Y direction, and light emitted from the LEDs.
- a plate-shaped light guide 4 for guiding light, a light deflection element 6, and a light reflection element 8 are provided.
- the plurality of LEDs 2 are preferably arranged so that the directions of the maximum intensity light emitted from them are parallel to each other.
- the direction of the maximum intensity light of the light emitted from the LED 2 can be, for example, the X direction.
- the light guide 4 is disposed in parallel with the XY plane and has a rectangular plate shape as a whole.
- the light guide 4 has four side end surfaces, and one of the pair of side end surfaces substantially parallel to the YZ plane is a light incident end surface 41 and faces the light incident end surface. LEDs 2 are arranged adjacent to each other.
- the other side end surface of the pair of side end surfaces substantially parallel to the YZ plane of the light guide 4 is an opposite end surface 42 opposite to the light incident end surface.
- the two principal surfaces that are substantially orthogonal to the light incident end surface 41 of the light guide 4 are both arranged so as to be substantially orthogonal to the Z direction, and the upper surface that is one of the principal surfaces is a light emitting surface 43. .
- the light emitting surface 43 is provided with a region in which a plurality of second lens rows 43b are formed.
- the second lens array 43b is a direction in the plane along the light exit surface 43 of the maximum intensity light emitted from the LED 2 and introduced into the light guide 4 (that is, along the light exit surface 43). It extends substantially along the X direction, which is the direction of the directivity of light that enters the light guide light incident end face 41 and is introduced into the light guide 4, and is arranged substantially parallel to each other. . That is, each of the second lens rows 43b arranged substantially parallel to each other extends substantially in the direction perpendicular to the boundary between the light emitting surface 43 and the light incident end surface 41, that is, in the X direction.
- the “light emitting surface 43” in the “boundary between the light emitting surface 43 and the light incident end surface 41” herein refers to a surface excluding the shapes of the rough surface 43a and the lens array 43b. Specifically, It is parallel to the XY plane. That is, the “boundary between the light emitting surface 43 and the light incident end surface 41” here extends substantially along the Y direction.
- the second lens array 43b has a cross-sectional shape orthogonal to the extending direction of the second lens array 43b, depending on the arrangement interval of the LEDs 2, an arc shape, a V shape, a V shape of the tip R, a sine curve, A desired shape such as a parabolic shape can be obtained.
- the second lens array 43b has a function of regularly controlling the direction of light that passes through or reflected by the second lens array 43b, and has a function of evenly diffusing light emitted from the point-like primary light source. Therefore, the cross-sectional shape is preferably an arc shape having a large number of angle components or a V-shape at the tip R.
- the radius of curvature is, for example, 5 to 200 ⁇ m, preferably 7 to 120 ⁇ m, more preferably 10 to 50 ⁇ m. It is. Further, the arrangement pitch of the second lens array 43b is, for example, 10 ⁇ m to 200 ⁇ m, preferably 10 ⁇ m to 150 ⁇ m, more preferably 20 ⁇ m to 100 ⁇ m, and a desired shape may be obtained in combination with the curvature radius.
- the surface of the second lens array 43b that is, the lens surface constituting the lens array (hereinafter also referred to as “slope” of the lens array) is roughened.
- the rough surface has a function of randomly diffusing light.
- the ratio between the effect of the regular direction control function and the effect of the random diffusion function varies depending on the degree of roughening of the lens array slope, but the degree of roughness of the slope is the average inclination angle described later with the slope as the reference plane.
- This average inclination angle can be measured in the extending direction of the second lens array 43b) is preferably 0.1 to 8 degrees, and more preferably 0.5 to 3 degrees.
- the average inclination angle is 0.1 degrees or more, a diffusion effect by a rough surface is obtained, and when the average inclination angle is 8 degrees or less, a regular direction control effect of the lens array is obtained.
- the average inclination angle is 0.5 degrees or more, a diffusion effect due to the rough surface is sufficiently obtained, and when the average inclination angle is 3 degrees or less, the regular direction control effect of the lens array is sufficiently obtained.
- the region where the second lens array 43b is formed on the light emitting surface 43 is a region close to the light incident end surface.
- This region can be a band-like region extending along the edge of the light emitting surface 43 adjacent to the light incident end surface 41.
- This area is outside the effective display area F described later, that is, the edge of the light emitting surface 43 adjacent to the light incident end face 41 (in other words, the boundary between the light emitting face 43 and the light incident end face 41).
- the effective display area F are preferably in a portion (incident side edge).
- the “incident side edge” refers not only to the portion for the light exit surface 43 as described above, but also to the portion for the light guide 4.
- the width and width of the band-like region in which the second lens array 43b is formed (that is, the dimension in the direction [X direction] perpendicular to the boundary between the light emitting surface 43 and the light incident end surface 41) sufficiently obtains the above-described effects. It is preferable that the size of the light guide 4 is, for example, twice or more the thickness of the light guide 4. If the region where the second lens array 43b is formed is too small, the above-described effects are not sufficiently obtained, and luminance unevenness may not be eliminated.
- the width A of the incident side edge portion (that is, the dimension in the direction [X direction] perpendicular to the boundary between the light emitting surface 43 and the light incident end surface 41) A is the light guide 4 at the incident side edge portion.
- the ratio A / T to the thickness T is preferably 5 or more.
- the thickness T of the light guide 4 at the incident side edge is determined by the top and back surfaces of the second lens row 43b of the light exit surface 43 (the first lens row 44a described later is the incident side edge). In this case, the distance (the dimension in the Z direction) between the first lens array 44a and the top of the first lens array 44a.
- this ratio A / T is too small, the above-mentioned effects cannot be obtained sufficiently, and luminance unevenness may not be eliminated.
- the ratio A / T is set to be 5 or more, it is possible to satisfactorily eliminate luminance unevenness based on the appearance of a hot spot [HotSpot] that appears corresponding to a point light source such as the LED 2.
- the effective display area F is a surface when a display device 11 such as a transmissive liquid crystal display element is arranged on a light emitting surface of a surface light source device to constitute a display device such as a liquid crystal display device.
- a display device 11 such as a transmissive liquid crystal display element
- the light source device it is a region where light used for illumination for effective display of the display device is actually emitted (that is, a region of the surface light source device corresponding to an effective display region of the display device).
- This effective display area F can be said to be the area of the light guide 4, for example, especially the area within the light exit surface 43.
- This effective display area F is often an area that is 1-5 mm diagonally smaller than the light emitting area of the surface light source device.
- the distance from the edge adjacent to the light incident end surface 41 of the light guide 4 to the effective display area F is the same as that of the surface light source device. Although it depends on the shape and size, it is generally about 2 to 10 mm.
- the region where the second lens array 43b is formed on the light exit surface 43 may be partial with respect to the width direction of the incident side edge portion.
- the width (dimension in the X direction) B is 1 ⁇ 2 or more (that is, 50% or more) of the width A of the incident side edge portion in order to further enhance the function and effect of the second lens array 43b. Is preferable, and the whole is particularly preferable.
- the region corresponding to the effective display region F of the light emitting surface 43 is preferably a rough surface 43a having a fine uneven structure as a light emitting control function structure. From the area formed by the rough surface 43a, light having directivity in the distribution in the XZ plane including both the normal direction (Z direction) of the light emitting surface 43 and the X direction orthogonal to the light incident end surface 41 is emitted.
- the angle between the direction of the peak of the emitted light distribution and the light emitting surface is, for example, 10 ° to 40 °, and the full width at half maximum of the emitted light distribution is, for example, 10 ° to 40 °.
- dx (1) ⁇ a tan ⁇ 1 ( ⁇ a) (2) Can be obtained using Here, L is the measurement length, and ⁇ a is the tangent of the average inclination angle ⁇ a.
- a direction across the light incident end face 41 for example, a direction substantially perpendicular to the light incident end face 41 (that is, a direction of directivity of light incident on the light guide 4 in a plane along the light emitting face 43)
- a large number of first lens rows 44a extending in parallel with each other along the direction) are formed.
- each of the first lens rows 44 a arranged substantially parallel to each other extends substantially in the direction perpendicular to the boundary between the back surface 44 and the light incident end surface 41, that is, in the X direction.
- the “back surface 44” in the “boundary between the back surface 44 and the light incident end surface 41” herein refers to a shape excluding the shape of the lens array 44a, and is specifically parallel to the XY plane. That is, the “boundary between the back surface 44 and the light incident end surface 41” here extends substantially along the Y direction.
- the first lens array 44a it is preferable to use a prism array or a lenticular lens array having an R-shaped tip.
- the aspect ratio of the first lens array that is, the ratio between the arrangement pitch (P1) and the height (H1) of the first lens array 44a.
- P1 / H1) is 7 to 200, preferably 8 to 150, more preferably 10 to 100, and the first lens array 44a having a circular sectional shape or a curved tip is preferably used.
- the aspect ratio of the first lens array 44a within this range, the emitted light from the light exit surface 43 can be sufficiently condensed, and further, the damage of the lens array 44a and the light reflecting element 8 can be reduced. This is because the generation of white spots due to the rubbing can be prevented. That is, by setting the shape of the first lens array 44a within this range, the full width at half maximum of the outgoing light distribution is 30 ° to 65 ° on the plane perpendicular to the XZ plane including the peak light direction in the outgoing light distribution. The emitted outgoing light can be emitted, and the luminance of the surface light source device can be improved.
- the arrangement pitch P1 of the first lens array 44a is, for example, 10 ⁇ m to 200 ⁇ m, preferably 10 ⁇ m to 150 ⁇ m, more preferably 20 ⁇ m to 100 ⁇ m.
- the cross-sectional shape of the tip of the first lens array 44a is preferably an arc shape with a radius of curvature R of 25 to 300 ⁇ m, but is not particularly limited to an arc shape, and may be a shape that can approximate it. .
- the cross-sectional shape of the first lens array 44a may be a curved shape at portions other than the tip portion, and may be a wave shape represented by, for example, a sine curve.
- the cross-sectional shape of the first lens array 44a may be a combination of a plurality of arc shapes, more specifically, a plurality of arc shapes so as to be inscribed in an arc shape having a radius of curvature R of 25 to 300 ⁇ m.
- the shape which combined these may be sufficient.
- the arc shape located at the top of one lens row 44a may be a shape that slightly protrudes from an arc shape having a radius of curvature R of 25 to 300 ⁇ m. In the present application, such a shape is also included in an arc shape having a curvature radius R of 25 to 300 ⁇ m.
- a plurality of fine concavo-convex structures may be formed on at least a part of the surface of the first lens array 44 a on the back surface of the light guide 4.
- FIG. 4 shows a cross-sectional shape of the first lens array 44a.
- Each of the fine concavo-convex structures has a concavo-convex shape in which the maximum aspect ratio, that is, the ratio of the long side to the height (depth) is 7 to 200 in the cross-sectional shape in the plane perpendicular to the light emitting surface. Is done.
- the light emitting surface 43 has a planar shape by providing a large number of fine concavo-convex structures having such shapes on the surface of the first lens array 44a, the normal direction (Z direction) of the light emitting surface 43 and It is possible to emit light having directivity in the distribution in the XZ plane including both the X direction orthogonal to the light incident end face 41.
- the fine concavo-convex structure is provided over the entire back surface, but it is not necessarily provided over the entire surface. Depending on the use of the light guide, etc., the fine concavo-convex structure may be provided in a preferable range. good.
- the light guide 4 As the light emitting function structure of the light guide 4, light diffusing fine particles are formed inside the light guide 4 in combination with the fine uneven structure formed on the light emitting surface 43 and / or the back surface 44 as described above. What was formed by mixing and dispersing can be used. Further, the light guide 4 has a uniform thickness as shown in FIGS. 1 and 2 (such as a rough surface of the light emitting surface 43, a fine uneven shape and a lens array, and a lens array on the back surface 44). In addition to a plate-like one with a thickness neglected, various cross-sectional shapes such as a wedge-like one that gradually decreases in thickness from the light incident end face 41 toward the opposite end face 42 in the X direction. Can be used. Furthermore, the structure of the light emitting surface 43 and the structure of the back surface 44 may be reversed.
- the thickness of the light guide 4 is, for example, 0.3 to 10 mm.
- the light deflection element 6 is disposed on the light emitting surface 43 of the light guide 4.
- the two main surfaces of the light deflection element 6 are each positioned substantially parallel to the XY plane as a whole.
- One of the two main surfaces (the main surface facing the light emitting surface 43 of the light guide) is a light incident surface 61, and the other is a light emitting surface 62.
- the light exit surface 62 is a flat or rough surface parallel to the light exit surface 43 of the light guide 4.
- the light incident surface 61 is a prism row forming surface in which a large number of prism rows 61a are arranged in parallel to each other.
- the prism rows 61a of the light incident surface 61 extend in the Y direction substantially parallel to the arrangement direction of the LEDs 2 and are formed in parallel to each other (that is, the light incident surface 61 is mutually aligned along the light guide light incident end surface 41).
- a plurality of prism rows 61a arranged in parallel are formed).
- the arrangement pitch P3 of the prism rows 61a is preferably in the range of 10 ⁇ m to 100 ⁇ m, more preferably in the range of 10 ⁇ m to 80 ⁇ m, and still more preferably in the range of 20 ⁇ m to 70 ⁇ m.
- the apex angle of the prism row 61a is preferably in the range of 30 ° to 80 °, more preferably in the range of 40 ° to 70 °.
- a prism array having a desired shape is accurately manufactured to obtain stable optical performance and to suppress wear and deformation of the top of the prism array during assembly work or use as a light source device.
- the top flat portion or the top curved surface portion may be formed at the top of the prism row.
- the width of the top flat part or the top curved surface part is preferably 3 ⁇ m or less from the viewpoint of suppressing the reduction in brightness as a surface light source device and the occurrence of uneven brightness patterns due to sticking, and more preferably the top part.
- the width of the flat part or the top curved part is 2 ⁇ m or less, more preferably 1 ⁇ m or less.
- the thickness of the light deflection element 6 is, for example, 30 to 350 ⁇ m.
- FIG. 3 shows a state of light deflection by the light deflection element 6.
- This figure shows the traveling direction of the peak outgoing light (light corresponding to the peak of the outgoing light distribution) from the light guide 4 in the XZ plane.
- the light emitted obliquely from the region consisting of the rough surface 43a of the light emitting surface 43 of the light guide body 4 is incident on the first surface of the prism row 61a and is totally reflected by the second surface, and is emitted from the light guide body 4.
- the emitted light is emitted in the direction of the normal line of the light exit surface 62 while maintaining the directivity of the emitted light.
- high luminance can be obtained in the direction of the normal line of the light exit surface 62.
- the light deflection element 6 functions to deflect (change angle) the light emitted from the light guide 4 in a target direction, and is combined with the light guide 4 that emits light having high directivity as described above.
- a lens sheet having a lens surface in which a large number of lens units are formed in parallel on at least one surface Various lens shapes are used depending on the purpose, and examples thereof include a prism shape, a lenticular lens shape, a fly-eye lens shape, and a wave shape.
- a prism sheet in which a large number of prism rows having a substantially triangular cross section are arranged in parallel is particularly preferable.
- at least one of the two prism surfaces constituting the prism row has a cross section consisting of a plurality of straight lines, one or more curves, or a combination of one or more straight lines and one or more curves. It may be a thing.
- the light guide 4 and the light deflection element 6 can be made of a synthetic resin having a high light transmittance.
- synthetic resins include methacrylic resins, acrylic resins, polycarbonate resins, polyester resins, vinyl chloride resins, and cyclic polyolefin resins.
- methacrylic resins are optimal because of their high light transmittance, heat resistance, mechanical properties, and molding processability.
- a methacrylic resin is a resin mainly composed of methyl methacrylate, and preferably has a methyl methacrylate content of 80% by weight or more.
- the transparent synthetic resin plate is formed by hot pressing using a mold member having a desired surface structure.
- the shape may be imparted simultaneously with molding by screen printing, extrusion molding, injection molding, or the like.
- the structural surface can also be formed using heat or a photocurable resin.
- a transparent substrate such as a polyester film, acrylic resin, polycarbonate resin, vinyl chloride resin, polymethacrylamide resin, or other transparent substrate or rough surface structure made of an active energy ray curable resin.
- a lens array arrangement structure may be formed on the surface, or such a sheet may be bonded and integrated on a separate transparent base material by a method such as adhesion or fusion.
- active energy ray-curable resin polyfunctional (meth) acrylic compounds, vinyl compounds, (meth) acrylic acid esters, allyl compounds, (meth) acrylic acid metal salts, and the like can be used.
- the light reflecting element 8 for example, a plastic sheet having a metal vapor deposition reflecting layer on the surface can be used.
- a reflector 10 is provided to guide the light emitted from the LED 2 to the light incident end face 41 of the light guide 4 with a small loss.
- the plastic film which has a metal vapor deposition reflective layer on the surface can be used, for example.
- the reflector 10 is wound from the outer surface of the edge of the light reflecting element 8 to the edge of the light emitting surface of the light polarizing element 6 through the outside of the LED 2.
- the light source reflector 10 can be wound around the light output surface edge of the light guide 4 from the outer surface of the LED 2 through the outside of the LED 2, avoiding the light polarizing element 6. is there.
- a plurality of point-like primary light sources such as LEDs are used.
- the plurality of point light sources are preferably arranged so that the directions of the maximum intensity light emitted from them are parallel to each other.
- the light is transmitted on the light emitting surface (the light exit surface 62 of the light polarizing element 6) of the surface light source device including the LED 2, the light guide 4, the light deflecting element 6, and the light reflecting element 8 as described above.
- a display device such as a liquid crystal display device is configured by disposing a display element 11 such as a liquid crystal display device.
- the symbol F indicates the effective display area of the surface light source device corresponding to the effective display area of the display element 11 used in combination with the surface light source device.
- the reflector 10 is disposed so as to cover the end surface portion of the laminated body of the light deflecting element 6, the light guide 4 and the light reflecting element 8 in the region other than the effective display region F, and the LED 2.
- the light emitted from the end surface portion of the laminated body and the light leaking from the case of the LED 2 can be diffused and reflected well in the XY plane and re-entered to the light guide 4, and the light guide light is emitted.
- Light having a required intensity can be guided to a wide area of the surface 43, which can contribute to an improvement in luminance uniformity.
- a display device such as a liquid crystal display device is observed by an observer through a display element 11 such as a liquid crystal display element from above in FIGS.
- a sufficiently collimated light with a narrow distribution can be made incident on the liquid crystal display element from the surface light source device, so that an image display with good brightness and hue uniformity can be obtained without gradation inversion on the liquid crystal display element.
- light irradiation concentrated in a desired direction can be obtained, and the use efficiency of the light emission amount of the primary light source for illumination in this direction can be enhanced.
- a light diffusing element can be adjacently disposed on the light exit surface 62 of the light deflection element 6. With this light diffusing element, it is possible to suppress glare, brightness spots, and the like that cause degradation in image display quality, and to improve image display quality.
- the light diffusing element may be a sheet-like material mixed with a light diffusing material, and may be integrated with the light deflecting element 6 by bonding or the like on the light exit surface 62 side of the light deflecting element 6. It may be placed on the deflection element 6. When placed on the light deflection element 6, in order to prevent sticking with the light deflection element 6, a concavo-convex structure is formed on the surface of the light diffusion element facing the light deflection element 6 (surface on the light incident side).
- This concavo-convex structure can have a ten-point average roughness of preferably 0.7 ° or more, more preferably 1.0 ° or more, and more preferably 1.5 ° or more.
- the light guide for the surface light source device described above includes forming a translucent resin using a molding die member having a shape transfer surface for forming the light emitting surface 43 and the back surface 44, respectively. 4 is manufactured.
- the shape transfer surface is formed by roughening a required region of the mold material by blasting. The distance between the blast nozzle and the mold material is preferably maintained constant from the viewpoint of ease of blasting.
- the blast particles spherical particles such as glass beads and polygonal particles such as alumina particles can be used.
- the light guide as described above is manufactured by molding a translucent resin (composition) using the molding die member produced as described above.
- FIG. 6 is a schematic partially exploded perspective view showing another embodiment of the surface light source device according to the present invention.
- the same reference numerals are given to the same parts as in FIG.
- This embodiment is different from the embodiment described with reference to FIGS. 1 to 4 only in the position in the Z direction of the second lens array 43b formed on the light emitting surface 43 of the light guide 4. That is, in the embodiment of FIGS. 1 to 4, the lens surface including the top of the second lens row 43b, that is, the inclined surface is a region other than the region where the second lens row 43b of the light emitting surface 43 is formed (that is, rough). (Region consisting of the surface 43a). On the other hand, in the embodiment of FIG. 6, the entire lens surface including the top of the second lens row 43 b, that is, the inclined surface is below the region formed by the rough surface 43 a of the light emitting surface 43 (that is, near the back surface 44). Located).
- the distance between the portion of the surface of the second lens array 43b closest to the rough surface 43a and the rough surface 43a is, for example, 0.1 to It can be (H2 + 10) ⁇ m, preferably 0.5 to (H2 + 3) ⁇ m.
- this distance that is, the difference in the Z-direction position (that is, the difference in height) between the top portion of the second lens array 43b and the rough surface 43a of the light emitting surface 43 is, for example, 1 to 30 ⁇ m. can do.
- the Z-direction reference surface inclination direction of the boundary region between the region where the second lens array 43 b is formed and the region including the rough surface 43 a is: It is the opposite of that of the embodiment of FIGS. That is, in the embodiment of FIGS. 1 to 4, the surface of the boundary region faces between the Z direction (light emitting surface normal direction) and the region formed by the rough surface 43 a, whereas in FIG. In the present embodiment, the surface of the boundary region is directed between the Z direction (light emitting surface normal direction) and the region where the second lens array 43b is formed. For this reason. Compared with the embodiments of FIGS. 1 to 4, the present embodiment has less leakage of the light guide from the boundary region, and can significantly reduce the occurrence of luminance unevenness derived from the boundary region.
- the surface light source device light guide 4 of the present embodiment also includes molding a translucent resin using a molding die member having a shape transfer surface for forming the light emitting surface 43 and the back surface 44, respectively. Can be manufactured.
- it is easy to form the shape transfer portion of the second lens array 43b, particularly when producing a molding die member. That is, in the molding die member, the entire shape transfer portion of the second lens array 43b is located higher than the shape transfer portion of the rough surface 43a. It can be easily formed by the reciprocating movement of the cutting blade using a cutting device such as the above.
- the Z-direction position of the second lens array 43b formed on the light emitting surface 43 of the light guide 4 is the same as that of the embodiment of FIGS. 1 to 4 and that of the embodiment of FIG. The case where it exists between is included. That is, the embodiment in which the second lens array 43b is located nearer to the back surface 44 than the area formed by the rough surface 43a, which is an area other than the area where the second lens array is formed, is also included in the present invention. included.
- the boundary region between the region where the second lens array 43 b is formed and the region formed by the rough surface 43 a is based on the above Z-direction reference.
- a part thereof is the same as that of the embodiment of FIGS. 1 to 4, but the other part is the same as that of the embodiment of FIG.
- the leakage of the light guide from the boundary region is less than in the embodiments of FIGS. 1 to 4, and the occurrence of luminance unevenness derived from the boundary region can be reduced.
- a second lens array 43b as shown in FIG. 2 is transferred and formed on the processed surface of a NiP plating block having an effective area of 195 mm (X direction dimension) ⁇ 307 mm (Y direction dimension) and 30 mm thickness with a mirror-finished processed surface. Cutting was performed so as to form a transfer region for this purpose.
- the second lens array 43b has an arc shape with a width of 50 ⁇ m (Y direction dimension), a height of 11 ⁇ m (Z direction dimension), and a curvature radius of 34 ⁇ m in a plane orthogonal to the extending direction of the second lens array 43b.
- the transfer area of the block has a corresponding inverted shape.
- the cutting length (dimension in the X direction) was 5 mm within the effective area so that the cutting portion would not enter the effective display area F of the light guide 4.
- glass beads J220 manufactured by Potters Barotini Co., Ltd.
- the first transfer surface forming mold was blasted so as to obtain a gradation.
- the blasting conditions were as follows. Glass beads are sprayed at a rate of 40 g / min from a height of 320 mm to a side farther from the side closer to the light incident end face at a pitch of 2.5 mm in a plurality of times, and the speed and pressure for each band are respectively set. By changing from 20 m / min to 4 m / min and from 0.2 MPa to 0.4 MPa, a gradation with an average inclination angle ⁇ a was formed.
- a first lens array 44a as shown in FIG. 2 is formed on the processed surface of another NiP plating block having a mirror-finished effective area of 195 mm (dimension in the X direction) ⁇ 307 mm (dimension in the Y direction) and a thickness of 10 mm. Cutting was performed so that a transfer surface for transfer formation was formed.
- the first lens array 44a has a substantially arc shape with a width of 50 ⁇ m (Y direction dimension), a height of 5 ⁇ m (Z direction dimension), and a curvature radius of 65 ⁇ m in a plane orthogonal to the extending direction of the first lens array 44a. .
- the transfer area of the block has a corresponding inverted shape.
- the processed surface of the obtained block was blasted with glass beads (J400 manufactured by Potters Barotini) to obtain a second transfer surface forming mold.
- the glass bead is applied in an amount of 60 g / min from a height of 520 mm to a strip shape at a pitch of 1 mm from the side closer to the light incident end face to a speed of 5 m / min and a pressure of 0.11 MPa. And sprayed several times.
- the first and second transfer surface forming molds were incorporated into an injection molding apparatus and injection molding was performed.
- an acrylic resin manufactured by Mitsubishi Rayon Co., Ltd., Acripet TF-8
- FIG. 5 shows a schematic view of the obtained molded product, that is, the light guide 4.
- LEDs manufactured by Toyoda Gosei Co., Ltd., E1S62-YWOS7-
- E1S62-YWOS7- are arranged at equal intervals along the long side so as to face the long side end surface (light incident end surface 41) having a thickness of 0.8 mm. 07) and the light source reflector 10 are further arranged.
- a light scattering reflection sheet (E6SP manufactured by Toray Industries, Inc.) is disposed as the light reflecting element 8 so as to face the back surface 44 of the light guide, and the apex angle as the light deflecting element 6 so as to face the light emitting surface 43.
- a prism sheet (M168YK, manufactured by Mitsubishi Rayon Co., Ltd.) having a thickness of 155 ⁇ m in which a large number of lens rows with a pitch of 50 ⁇ m are formed in parallel at 65 ° is arranged so that the lens row formation surface faces the light emitting surface 43.
- the outer edge of the effective display area F is located at a position of 5.2 mm from the outer periphery of the light guide due to the relationship with the effective display area of the combined transmissive liquid crystal display element. Accordingly, the ratio A / T of the width (X-direction dimension) A (5.2 mm) of the incident side edge portion to the thickness T (0.811 mm) of the light guide 4 at the incident side edge portion is 6 .41. Further, the width of the band-like region where the second lens array 43b is formed, that is, the X-direction dimension B (5 mm) of the second lens array 43b is 96% of the width A (5.2 mm) of the incident side edge portion. It is.
- the processed surface of the plate having a thickness of 3.05 mm, a thickness of 3 mm for forming the transfer region for transferring the rough surface 43a, and a boundary region width of 0.7 mm for these portions
- cutting was performed so that a transfer region for transferring and forming the second lens array 43b as shown in FIG. 6 was formed.
- the second lens array 43b has a width of 70 ⁇ m (dimension in the Y direction), a height of 24 ⁇ m (dimension in the Z direction), an apex angle of 80 degrees, and a radius of curvature of the tip in a plane orthogonal to the extending direction of the second lens array 43b.
- the V shape of the tip R was 34 ⁇ m.
- the tip of the second lens array 43b is arranged at a position 5 ⁇ m lower than the area formed by the rough surface 43a.
- the transfer area of the block has a corresponding inverted shape.
- the cutting length (dimension in the X direction) was 3 mm within the effective area, so that the cutting portion did not enter the effective display area F of the light guide 4.
- glass beads J220 manufactured by Potters Barotini
- the conditions for blasting were as follows. Glass beads are sprayed at a rate of 40 g / min from a height of 320 mm to a side farther from the side closer to the light incident end face at a pitch of 2.5 mm in a plurality of times, and the speed and pressure for each band are respectively set. By changing from 20 m / min to 3 m / min and from 0.2 MPa to 0.4 MPa, a gradation with an average inclination angle ⁇ a was formed.
- a first lens array as shown in FIG. 6 is formed on a processed surface of a NiP plating block having an effective area of 175.5 mm (X direction dimension) ⁇ 285.5 mm (Y direction dimension) and a thickness of 30 mm. Cutting was performed so that a transfer surface for transferring 44a was formed.
- the first lens array 44a has a substantially arc shape with a width of 50 ⁇ m (Y direction dimension), a height of 5 ⁇ m (Z direction dimension), and a curvature radius of 65 ⁇ m in a plane orthogonal to the extending direction of the first lens array 44a. .
- the transfer area of the block has a corresponding inverted shape.
- glass beads J400 manufactured by Potters Barotini
- Example 1 glass beads (J400 manufactured by Potters Barotini) were blasted on the processed surface of the obtained block in the same manner as in Example 1 to obtain a second transfer surface forming mold.
- the first and second transfer surface forming molds were assembled in an injection molding apparatus in the same manner as in Example 1 to perform injection molding.
- the light exit surface 43 of the obtained light guide has a rough surface 43a having a gradation of 0.8 to 2.9 degrees from the side closer to the light incident end surface to the side closer to the light incident end surface ⁇ a, and the first rough surface 43a.
- the second lens array 43b has a partially roughened surface, has a V-shaped cross-section at the tip R with a width of 70 ⁇ m, a height of 24 ⁇ m, an apex angle of 80 degrees, and a radius of curvature of the tip of 34 ⁇ m. It extended 3 mm vertically from the incident end face.
- a first lens array 44a having a substantially arc cross-sectional shape with a partially roughened surface having a width of 50 ⁇ m, a height of 5 ⁇ m, and a curvature radius of 65 ⁇ m is formed over the entire surface. It had been.
- LEDs (E1S62-YWOS7, manufactured by Toyoda Gosei Co., Ltd.) are arranged at equal intervals along the long side so as to face the long side end surface (light incident end surface 41) having a thickness of 0.7 mm. 07) and the light source reflector 10 are further arranged. Further, a light scattering reflection sheet (E6SP manufactured by Toray Industries, Inc.) is disposed as the light reflecting element 8 so as to face the back surface 44 of the light guide, and the apex angle as the light deflecting element 6 so as to face the light emitting surface 43.
- E6SP manufactured by Toray Industries, Inc.
- a prism sheet (M268YWC3, manufactured by Mitsubishi Rayon Co., Ltd.) having a thickness of 188 ⁇ m in which a large number of lens arrays with a pitch of 29 ⁇ m at 68 ° are formed in parallel is arranged so that the lens array formation surface faces the light exit surface 43, and FIG. A surface light source device as shown in FIG.
- the outer edge of the effective display area F is located at a position 6 mm from the outer periphery of the light guide because of the relationship with the effective display area of the combined transmissive liquid crystal display element. Therefore, the ratio A / T of the width (X-direction dimension) A (6 mm) of the incident side edge portion to the thickness T (0.795 mm) of the light guide 4 at the incident side edge portion is 7.55. It is. In addition, the width of the band-like region where the second lens array 43b is formed, that is, the X-direction dimension B (3 mm) of the second lens array 43b is 50% of the width A (6 mm) of the incident side edge. .
- Table 1 shows the thickness T [mm] of the light guide 4 at the incident side edge, the width A [mm] of the incident side edge, and the X-direction dimension B [mm] of the second lens array 43b. Accordingly, A / T and B / A [%] are as shown in Table 1, and the size [inch type] is as shown in Table 1. A light source device was produced.
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Abstract
Description
一次光源から発せられる光を導光し、且つ前記一次光源から発せられる光が入射する光入射端面、導光される光が出射する光出射面、及び該光出射面の反対側の裏面を有する板状の導光体であって、前記光入射端面に近接して、前記導光体を用いた面光源装置を用いて形成される表示装置の有効な表示領域に対応する有効表示領域の外となる入射側端縁部が形成される面光源装置用導光体において、
前記光出射面及び裏面のうちの一方の面に、該一方の面と前記光入射端面との境界に垂直の方向にほぼ沿って延び、且つ互いに略平行に配列された複数の第1のレンズ列が形成されており、
前記入射側端縁部において、前記光出射面及び裏面のうちの他方の面には、前記他方の面と前記光入射端面との境界に垂直の方向にほぼ沿って延び、且つ互いに略平行に配列された複数の第2のレンズ列が形成されており、
前記入射側端縁部における前記導光体の厚さTに対する、前記他方の面と前記光入射端面との境界に垂直の方向の前記入射側端縁部の寸法Aの比A/Tが5以上であることを特徴とする面光源装置用導光体、
が提供される。
上記の面光源装置用導光体と、該導光体の前記光入射端面に隣接して配置された前記一次光源と、前記導光体の前記光出射面に隣接して配置された光偏向素子とを含んでなる面光源装置であって、
前記面光源装置用導光体の入射側端縁部は、前記面光源装置を用いて形成される表示装置の有効な表示領域に対応する有効表示領域の外に位置することを特徴とする面光源装置、
が提供される。
上記の面光源装置と、該面光源装置から出光する光が到来するように配置された表示素子とを含んでなる表示装置であって、
前記面光源装置用導光体の入射側端縁部は、前記表示装置の有効な表示領域の外に位置することを特徴とする表示装置、
が提供される。
Δa=(1/L)∫0 L|(d/dx)f(x)|dx ・・・ (1)
θa=tan-1(Δa) ・・・ (2)
を用いて求めることができる。ここで、Lは測定長さであり、Δaは平均傾斜角θaの正接である。
光偏向素子6は、導光体4の光出射面43上に配置されている。光偏向素子6の2つの主面は、それぞれ全体としてXY面と略平行に位置する。2つの主面のうちの一方(導光体の光出射面43と対向する主面)は入光面61とされており、他方が出光面62とされている。出光面62は、導光体4の光出射面43と平行な平坦面または粗面とされている。入光面61は、多数のプリズム列61aが互いに平行に配列されたプリズム列形成面とされている。
加工面が鏡面仕上げされた有効面積195mm(X方向寸法)×307mm(Y方向寸法)、厚さ30mmのNiPめっきブロックの加工面に、図2に示すような第2のレンズ列43bを転写形成するための転写領域が形成されるよう切削加工を行った。第2のレンズ列43bは、第2のレンズ列43bの延びる方向と直交する面内において、幅50μm(Y方向寸法)、高さ11μm(Z方向寸法)、曲率半径34μmの円弧形状とした。ブロックの転写領域は、これに対応する反転形状を有する。切削加工長さ(X方向寸法)は有効面積内において5mmとし、導光体4の有効表示領域Fに切削加工部分が入らないようにした。
第1の転写面形成金型を作製するに際して、鏡面仕上げをした有効面積195mm(X方向寸法)×307mm(Y方向寸法)、厚さ3mmのステンレススチール板を型素材として用い、第2のレンズ列43bを転写形成するための転写領域を形成させずにガラスビーズ(ポッターズバロティーニ社製J220)を用いて、ブラスト処理を行ったこと、以外は実施例1と同様にして面光源装置を作製した。
加工面が鏡面仕上げされた有効面積175.5mm(X方向寸法)×285.5mm(Y方向寸法)のNiPめっき板であって、第2のレンズ列43bを転写形成するための転写領域を形成する部分の厚さが3.05mmで、粗面43aを転写形成するための転写領域を形成する部分の厚さが3mmで、これらの部分の境界領域の幅が0.7mmの板の加工面に、図6に示すような第2のレンズ列43bを転写形成するための転写領域が形成されるよう切削加工を行った。第2のレンズ列43bは、第2のレンズ列43bの延びる方向と直交する面内において、幅70μm(Y方向寸法)、高さ24μm(Z方向寸法)、頂角80度、先端の曲率半径34μmの、先端RのV字形状とした。また、第2のレンズ列43bの先端部が、粗面43aからなる領域より5μm低い位置に配置されるようにした。ブロックの転写領域は、これに対応する反転形状を有する。切削加工長さ(X方向寸法)は有効面積内において3mmとし、導光体4の有効表示領域Fに切削加工部分が入らないようにした。
入射側端縁部の導光体4の厚さT[mm]、当該入射側端縁部の幅A[mm]及び第2のレンズ列43bのX方向寸法B[mm]を以下の表1に示すようにし、従ってA/T及びB/A[%]を表1に示すようにし、サイズ[インチ型]を表1に示すようにしたこと以外は、実施例1と同様にして、面光源装置を作製した。
4 導光体
41 光入射端面
42 反対端面
43 光出射面
43a 粗面
43b 第2のレンズ列
44 裏面
44a 第1のレンズ列
6 光偏向素子
61 入光面
61a プリズム列
62 出光面
8 光反射素子
10 リフレクタ
11 表示素子
F 有効表示領域
Claims (8)
- 一次光源から発せられる光を導光し、且つ前記一次光源から発せられる光が入射する光入射端面、導光される光が出射する光出射面、及び該光出射面の反対側の裏面を有する板状の導光体であって、前記光入射端面に近接して、前記導光体を用いた面光源装置を用いて形成される表示装置の有効な表示領域に対応する有効表示領域の外となる入射側端縁部が形成される面光源装置用導光体において、
前記光出射面及び裏面のうちの一方の面に、該一方の面と前記光入射端面との境界に垂直の方向にほぼ沿って延び、且つ互いに略平行に配列された複数の第1のレンズ列が形成されており、
前記入射側端縁部において、前記光出射面及び裏面のうちの他方の面には、前記他方の面と前記光入射端面との境界に垂直の方向にほぼ沿って延び、且つ互いに略平行に配列された複数の第2のレンズ列が形成されており、
前記入射側端縁部における前記導光体の厚さTに対する、前記他方の面と前記光入射端面との境界に垂直の方向の前記入射側端縁部の寸法Aの比A/Tが5以上であることを特徴とする面光源装置用導光体。 - 前記第2のレンズ列は、前記他方の面と前記光入射端面との境界に垂直の方向の寸法が前記入射側端縁部の寸法Aの50%以上であることを特徴とする、請求項1に記載の面光源装置用導光体。
- 前記第2のレンズ列を構成するレンズ面は、粗面化されており且つ前記第2のレンズ列の延びる方向に沿って測定される平均傾斜角が0.1~8度の範囲内にあることを特徴とする、請求項1に記載の面光源装置用導光体。
- 前記第2のレンズ列が形成された領域は前記他方の面の一部であり、
前記第2のレンズ列は、部分的に、前記他方の面の前記第2のレンズ列が形成された領域以外の領域より、前記一方の面の近くに位置することを特徴とする、請求項1に記載の面光源装置用導光体。 - 前記第2のレンズ列が形成された領域は前記他方の面の一部であり、
前記第2のレンズ列は、全体が、前記他方の面の前記第2のレンズ列が形成された領域以外の領域より、前記一方の面の近くに位置することを特徴とする、請求項1に記載の面光源装置用導光体。 - 請求項1に記載の面光源装置用導光体と、該導光体の前記光入射端面に隣接して配置された前記一次光源と、前記導光体の前記光出射面に隣接して配置された光偏向素子とを含んでなる面光源装置であって、
前記面光源装置用導光体の入射側端縁部は、前記面光源装置を用いて形成される表示装置の有効な表示領域に対応する有効表示領域の外に位置することを特徴とする面光源装置。 - 前記光偏向素子は前記導光体の光出射面に対向して位置する入光面とその反対側の出光面とを有しており、前記入光面には前記光入射端面に沿って互いに平行に配列された複数のプリズム列が形成されていることを特徴とする、請求項6に記載の面光源装置。
- 請求項6に記載の面光源装置と、該面光源装置から出光する光が到来するように配置された表示素子とを含んでなる表示装置であって、
前記面光源装置用導光体の入射側端縁部は、前記表示装置の有効な表示領域の外に位置することを特徴とする表示装置。
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JP2009551908A JP5424901B2 (ja) | 2008-11-21 | 2009-11-20 | 面光源装置及びそれに用いる導光体 |
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JP (1) | JP5424901B2 (ja) |
KR (1) | KR20110086632A (ja) |
CN (1) | CN102224373A (ja) |
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WO (1) | WO2010058845A1 (ja) |
Cited By (6)
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JP2012028327A (ja) * | 2010-07-23 | 2012-02-09 | Entire Technology Co Ltd | 微小構造を具える反射均一光導光装置及び該反射均一光導光装置を有するバックライトモジュール及び液晶ディスプレイ |
JP2012084262A (ja) * | 2010-10-07 | 2012-04-26 | Sony Corp | 発光装置及び画像表示装置 |
CN103162177A (zh) * | 2011-12-16 | 2013-06-19 | 奇美实业股份有限公司 | 侧光式背光模组及导光板 |
JP2015072921A (ja) * | 2014-12-03 | 2015-04-16 | ソニー株式会社 | 発光装置 |
TWI580893B (zh) * | 2014-11-12 | 2017-05-01 | 元太科技工業股份有限公司 | 發光模組及顯示設備 |
US9664840B2 (en) | 2014-11-12 | 2017-05-30 | E Ink Holdings Inc. | Light emitting module and display device |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114509843B (zh) * | 2021-12-30 | 2023-08-01 | 苏州天禄光科技股份有限公司 | 侧入式导光板及侧入式背光模组 |
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JP2002343124A (ja) * | 2001-05-15 | 2002-11-29 | Mitsubishi Rayon Co Ltd | 面光源装置 |
JP2005019417A (ja) * | 2002-03-05 | 2005-01-20 | Seiko Epson Corp | 照明装置、液晶装置及び電子機器 |
JP2006171253A (ja) * | 2004-12-15 | 2006-06-29 | Kuroda Techno Co Ltd | バックライトアッセンブリの導光板 |
JP2008218418A (ja) * | 2008-03-31 | 2008-09-18 | Mitsubishi Rayon Co Ltd | 面光源装置及びそれに用いる導光体 |
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2009
- 2009-11-20 TW TW98139605A patent/TW201030395A/zh unknown
- 2009-11-20 JP JP2009551908A patent/JP5424901B2/ja not_active Expired - Fee Related
- 2009-11-20 WO PCT/JP2009/069728 patent/WO2010058845A1/ja active Application Filing
- 2009-11-20 CN CN2009801477778A patent/CN102224373A/zh active Pending
- 2009-11-20 KR KR1020117014162A patent/KR20110086632A/ko not_active Application Discontinuation
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JP2002343124A (ja) * | 2001-05-15 | 2002-11-29 | Mitsubishi Rayon Co Ltd | 面光源装置 |
JP2005019417A (ja) * | 2002-03-05 | 2005-01-20 | Seiko Epson Corp | 照明装置、液晶装置及び電子機器 |
JP2006171253A (ja) * | 2004-12-15 | 2006-06-29 | Kuroda Techno Co Ltd | バックライトアッセンブリの導光板 |
JP2008218418A (ja) * | 2008-03-31 | 2008-09-18 | Mitsubishi Rayon Co Ltd | 面光源装置及びそれに用いる導光体 |
Cited By (8)
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JP2012028327A (ja) * | 2010-07-23 | 2012-02-09 | Entire Technology Co Ltd | 微小構造を具える反射均一光導光装置及び該反射均一光導光装置を有するバックライトモジュール及び液晶ディスプレイ |
JP2012084262A (ja) * | 2010-10-07 | 2012-04-26 | Sony Corp | 発光装置及び画像表示装置 |
US9170363B2 (en) | 2010-10-07 | 2015-10-27 | Sony Corporation | Light-emitting device and image display apparatus |
CN103162177A (zh) * | 2011-12-16 | 2013-06-19 | 奇美实业股份有限公司 | 侧光式背光模组及导光板 |
JP2013127966A (ja) * | 2011-12-16 | 2013-06-27 | Chi Mei Corp | 導光板及びこれを用いたエッジライト型バックライト |
TWI580893B (zh) * | 2014-11-12 | 2017-05-01 | 元太科技工業股份有限公司 | 發光模組及顯示設備 |
US9664840B2 (en) | 2014-11-12 | 2017-05-30 | E Ink Holdings Inc. | Light emitting module and display device |
JP2015072921A (ja) * | 2014-12-03 | 2015-04-16 | ソニー株式会社 | 発光装置 |
Also Published As
Publication number | Publication date |
---|---|
JP5424901B2 (ja) | 2014-02-26 |
JPWO2010058845A1 (ja) | 2012-04-19 |
TW201030395A (en) | 2010-08-16 |
CN102224373A (zh) | 2011-10-19 |
KR20110086632A (ko) | 2011-07-28 |
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