WO2010016501A1 - 面光源装置 - Google Patents
面光源装置 Download PDFInfo
- Publication number
- WO2010016501A1 WO2010016501A1 PCT/JP2009/063825 JP2009063825W WO2010016501A1 WO 2010016501 A1 WO2010016501 A1 WO 2010016501A1 JP 2009063825 W JP2009063825 W JP 2009063825W WO 2010016501 A1 WO2010016501 A1 WO 2010016501A1
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- WO
- WIPO (PCT)
- Prior art keywords
- light source
- light
- guide plate
- light guide
- dichroic filter
- 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
- G02B6/0013—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
- G02B6/0026—Wavelength selective element, sheet or layer, e.g. filter or grating
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0031—Reflecting element, sheet or layer
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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
- G02B6/0075—Arrangements of multiple light guides
- G02B6/0078—Side-by-side arrangements, e.g. for large area displays
Definitions
- the present invention relates to a surface light source device, and in particular, is applied to a backlight of a transmissive LCD (LCD; liquid crystal display) or a transflective LCD, or an auxiliary light source (front light) of a reflective LCD.
- the present invention relates to a surface light source device.
- Patent Documents 1 to 3 As the surface light source device, one using a light guide plate is known (for example, see Patent Documents 1 to 3).
- the light guide plate has at least one end in the length direction of the plate as the light guide plate entrance surface, and both ends in the thickness direction of the plate are the light guide plate exit surface and the light guide plate back surface, respectively, and light emitted from the light source is incident on the light guide plate. It is designed and manufactured so that it can be introduced from the surface and spread over almost the entire area of the light guide plate exit surface.
- the light that has entered the light guide plate from the light guide plate entrance surface is totally reflected by the light guide plate exit surface and the back surface of the light guide plate, so that it spreads over almost the entire area of the light guide plate exit surface and exits from the light guide plate exit surface.
- the shape of the cross section perpendicular to the width direction of the light guide plate is a wedge shape
- the end surface of the wedge-shaped base side is the light guide plate incident surface. It is well known that it is advantageous that more light can be guided toward the wedge-shaped tip. For this reason, a surface light source device using a so-called wedge-shaped light guide plate in which the cross-sectional shape is a wedge shape is widely used.
- a full-color LCD usually, a liquid crystal layer, a polarizing plate disposed on the front and back surfaces of the liquid crystal layer, and R (red) disposed between the liquid crystal layer and the polarizing plate on the front surface side
- a backlight composed of the surface light source device is disposed on the back side of a display device having color filters that respectively transmit G (green) and B (blue) light.
- Light from the light source is guided by the light guide plate of the backlight, and the display device is irradiated with light from the back side.
- the liquid crystal orientation of the liquid crystal element is controlled by applying a voltage, and the amount of light transmitted through each color filter is modulated to perform full color display.
- the color filter used in this type of display device has high saturation and can produce a wide color reproduction range.
- the amount of light from the light guide plate is attenuated to about 1/3 by the color filter, and the entire display becomes dark. There is.
- a dichroic filter that reflects visible light other than the selectively transmitted wavelength is used instead of the color filter, and this is further arranged on the surface of the backlight (light guide plate exit surface of the surface light source device). It is known to install (see Patent Document 4).
- a dichroic filter for example, light (light other than R) reflected by a dichroic filter (R filter) that selectively transmits the wavelength of R light is G or B. It is difficult to selectively re-enter G or B light by efficiently re-entering any one of the dichroic filters (G filter and B filter) that selectively transmit the wavelength of the light. This also applies to the light reflected by the G filter and the B filter. Accordingly, there is a problem that the light utilization rate is reduced accordingly. In addition, it is necessary to dispose the dichroic filter beyond the area of the liquid crystal element, which increases the manufacturing cost.
- the present invention has been made in view of the above problems, and an object thereof is to provide a surface light source device having a high light utilization rate and a high color purity.
- the surface light source device of the present invention uses a light source and at least one end portion in the length direction of the plate as a light guide plate incident surface, and both end portions in the thickness direction of the plate as light guide plate exit surfaces, respectively.
- a light guide plate composed of the plate that introduces light emitted from the light source as the back surface of the light guide plate from the light incident surface of the light guide plate, and spreads and emits light over substantially the entire area of the light guide plate emission surface; and light emitted from the light source.
- a phase of a selective transmission wavelength among dichroic filters that selectively transmits only light of a specific wavelength and reflects other light.
- the width direction of the light guide plate is a notch groove provided so as to extend in the length direction of the light guide plate starting from a facing portion with a boundary between adjacent dichroic filters, which is a boundary between adjacent elements of the dichroic filter row And a plurality of light guide path portions divided into two.
- the light (primary incident light) emitted from the light source and incident on one of the dichroic filters having different selective transmission wavelengths has a component (light) that matches the selective transmission wavelength of the dichroic filter. Transmits and the rest reflects.
- the reflected light is further reflected by the primary reflector, about 2/3 of which is incident on a filter having a selective transmission wavelength different from the previous one, and thereafter follows the same process as the primary incident light. Accordingly, a lot of the light reflected by the dichroic filter row is reflected again, passes through the dichroic filter row, is taken into the light guide plate, and is emitted from the light guide plate exit surface. For this reason, the utilization factor of light can be improved compared with the past.
- the surface light source device has a plurality of light guide path portions formed by dividing one or both of both end portions in the thickness direction of the light guide plate in the width direction of the light guide plate at the cutout grooves.
- a dichroic filter that selectively transmits a specific color wavelength and enters the light guide plate is passed through a light guide path section that is separated from the others, and hardly mixed with light of other colors (wavelengths). Can be emitted from the light guide plate exit surface. Accordingly, it is possible to suppress a decrease in color purity of each color light within the light guide plate.
- the notch groove is opened at a light guide plate incident surface, and the opening at the light guide plate incident surface is shielded by a shielding reflecting material having a reflection surface on the side facing the light source. It is preferable.
- the notch groove when the notch groove is opened on the light guide plate entrance surface that is the starting point of the notch groove, the light passes through both sides of the boundary between adjacent dichroic filters, which is a boundary between adjacent elements of the dichroic filter row.
- the two colors of light enter and mix into the same notch groove and are mixed with the light emitted from the light guide plate exit surface side of the light guide path portion to cause color unevenness.
- the notch groove should be constant after the groove width increases from zero or increases from zero toward the end point in the extending direction from the light guide plate incident surface. Also good.
- the groove width due to the notch groove on the light guide plate incident surface is zero, and the groove width temporarily increases from the light guide plate incident surface toward the end point in the extending direction. Therefore, an opening is made only immediately below the light guide plate entrance surface, and there is no opening due to the notch groove on the light guide plate entrance surface. For this reason, light of two colors transmitted through both sides of the boundary between adjacent dichroic filters, which is a boundary between adjacent elements of the dichroic filter row, enters and mixes in the same notch groove, and exits the light guide plate of the light guide path portion. It is possible to suppress the problem of color unevenness due to color mixing with light emitted from the surface side.
- a color-coded reflective material having a reflective surface on the side facing the light guide path portion is disposed inside the notch groove.
- the surface facing the light source in the dichroic filter row is a concave surface or a connection of a plurality of elliptical arcs in which the line of intersection with the orthogonal surface in the width direction of the light guide plate is a single elliptical arc shape.
- the light source on one line of a parallel two-trajectory line formed by moving two focal points of a mother ellipse including the concave surface portion as an elliptical arc in the width direction of the light guide plate.
- Is disposed on the other line and further reflects the light reflected from the light source facing surface of the dichroic filter row out of the light emitted from the light source to irradiate the light source facing surface of the dichroic filter row. It is preferable that the child is arranged.
- the light source can give directivity to the light distribution, and can irradiate most of the light source light on the light incident surface of the light guide plate. It is preferably at least one light source selected from the group consisting of RGB-LED light sources, multi-color LED light sources, organic EL light sources, and laser light sources.
- the reflecting surface shape of the secondary reflector is an element pitch in the dichroic filter row in the width direction of the light guide plate, and has an interval equal to or less than the pitch of the dichroic filter. It is a surface shape that repeats the same shape as any one of the connection shape, the lens shape of the columnar aspheric lens, and the connection shape in which the prism two-surface connection shape and the lens shape of the columnar aspheric lens are mixed. Is preferred.
- the secondary reflector has a reflected principal ray moved in the width direction of the light guide plate at the intersection of the minor axis of the mother ellipse including the concave surface portion as an elliptical arc and the concave surface portion. It is preferable that the direction of the reflecting surface is adjusted so as to intersect the locus straight line.
- the light source has a locus in which the principal ray of radiation moves in the width direction of the light guide plate at the intersection of the minor axis of the mother ellipse including the concave surface portion as an elliptical arc and the concave surface portion. It is preferable that the light irradiation direction is adjusted so as to cross the straight line.
- the surface light source device of the present invention further includes a reflecting mirror facing the back surface of the light guide plate, and a side facing the back surface of the light guide plate in the reflecting mirror is a reflecting surface having an area equal to or larger than the area of the back surface of the light guide plate. It is preferable.
- the light leaking from the back surface of the light guide plate can be reflected by the reflecting mirror and applied to the back surface of the light guide plate.
- the area of the reflecting surface of the reflecting mirror is larger than the area of the back surface of the light guide plate, the ratio of the light reflected from the reflecting mirror and irradiated to the back surface of the light guide plate out of the light leaking from the back surface of the light guide plate growing. Therefore, the utilization factor of light source light can be further improved.
- the light reflected by the dichroic filter array on the light guide plate entrance surface can be reflected by the primary reflector or further the secondary reflector and irradiated again to the dichroic filter array, thereby improving the light utilization rate.
- the primary reflector or further the secondary reflector can be reflected again to the dichroic filter array, thereby improving the light utilization rate.
- FIG. (A) is sectional drawing which shows typically an example of schematic structure of the surface light source device concerning one Embodiment of this invention
- FIG. (A) is sectional drawing which shows typically an example of schematic structure of the surface light source device concerning one Embodiment of this invention
- (b) is typical schematic structure of the B section shown to (a).
- (C) is an exploded perspective view schematically showing a schematic configuration of a B portion shown in (a).
- (A) is sectional drawing which shows typically an example of schematic structure of the surface light source device concerning one Embodiment of this invention
- (b) and (c) are C parts shown to (a), respectively.
- (d) is a disassembled perspective view which shows typically schematic structure of the D section common to (b) and (c).
- (A)-(c) is sectional drawing which shows typically an example of schematic structure of the surface light source device concerning one Embodiment of this invention, respectively.
- (A) is a perspective view which shows typically an example of schematic structure of the surface light source device concerning one Embodiment of this invention
- (b) is the light-guide plate entrance surface of the surface light source device shown to (a).
- (c) is a top view which shows typically schematic structure of the light-guide plate entrance plane vicinity of the surface light source device shown to (a).
- (A) * (b) is a top view which shows typically an example of schematic structure of the light-guide plate entrance surface vicinity of the surface light source device concerning one Embodiment of this invention, respectively.
- (A)-(c) is sectional drawing which shows typically an example of schematic structure of the light-guide plate entrance surface vicinity of the surface light source device concerning one Embodiment of this invention, respectively. It is a perspective view which shows typically an example of schematic structure of the light-guide plate entrance surface vicinity of the surface light source device concerning one Embodiment of this invention.
- (A) * (b) is sectional drawing which shows typically an example of schematic structure of the surface light source device concerning one Embodiment of this invention, respectively.
- FIGS. 1A and 1B to 9A and 9B An embodiment of the present invention will be described below with reference to FIGS. 1A and 1B to 9A and 9B.
- FIG. 1A is a cross-sectional view schematically showing an example of a schematic configuration of a surface light source device according to an embodiment of the present invention
- FIG. 1B is a schematic configuration of a portion A shown in FIG. It is a top view which shows typically.
- the surface light source device of the present invention includes a light guide plate 1, a light source 2, a primary reflector 3, and a dichroic filter row 4.
- the light guide plate 1 has one end portion in the plate length direction (L direction) as a light guide plate incident surface (hereinafter simply referred to as “incident surface”) 11, and both end portions in the plate thickness direction (T direction) as light guide plates.
- incident surface a light guide plate incident surface
- T direction a plate thickness direction
- Light emitted from the light source 2 is introduced from the incident surface 11 as an exit surface (hereinafter simply referred to as “exit surface”) 12 and a rear surface of the light guide plate (hereinafter simply referred to as “back surface”) 13. It is designed and manufactured to be spread over the entire area.
- the light guide plate 1 is a wedge-shaped light guide plate, but may be a flat light guide plate.
- the T direction of the wedge-shaped light guide plate is a direction orthogonal to the exit surface 12.
- the T direction may be a direction orthogonal to the back surface 13.
- the incident surface 11 is taken as one end portion in the L direction, but may be at both end portions.
- the light guide plate 1 is typically formed using a transparent resin material such as polycarbonate or polymethyl methacrylate.
- a transparent resin material such as polycarbonate or polymethyl methacrylate.
- the present embodiment is not limited to this.
- the light source 2 may be either a point light source or a surface light source.
- the point light source include a white LED (light emitting diode) light source, an RGB-LED light source, a multi-color LED light source, and a laser light source.
- the surface light source include an organic EL (EL: electroluminescence) light source.
- a white LED light source emits white light from one LED chip by superimposing a plurality of lights having different wavelengths.
- a white LED light source although the light emitting element formed by combining blue LED and yellow light emission fluorescent substance is mentioned, for example, it is not limited to this.
- the RGB-LED light source is a light emitting element in which a red (R) LED, a green (G) LED, and a blue (B) LED are each mounted in one package.
- the multi-color LED light source is a light emitting element in which a plurality of types (for example, three types) of LEDs having different emission colors are mounted in a single package.
- At least one light source selected from the group consisting of these white LED light source, RGB-LED light source, multi-color LED light source, laser light source, and organic EL light source may impart directivity to the light distribution. It is possible to irradiate most of the light source light to the light guide plate incident surface, and therefore it is particularly preferably used.
- the primary reflector 3 is composed of a casing (reflector) that surrounds the light source 2 and the incident surface 11 side with the inner surface side as a reflecting surface.
- the light emitted from the light source 2 is reflected by the primary reflector 3 and is incident on the incident surface 11 when the dichroic filter row 4 is not provided.
- the dichroic filter row 4 is disposed on the incident surface 11, the light reflected by the primary reflector 3 is irradiated to the dichroic filter row 4.
- the primary reflector 3 for example, a plate-like reflector, a film-like reflector, or the like can be used.
- the material of the primary reflector 3 is not particularly limited, and may be a regular reflection material or a diffuse reflection material.
- regular reflection material examples include metal materials such as silver and aluminum. Among these, silver is preferable because of its high reflectance (regular reflectance). There is also a method of further increasing the reflectance by laminating a dielectric multilayer film composed of a plurality of dielectric films on a metal material or the like.
- examples of the diffuse reflection material include white materials such as white plastic and white paint.
- the utilization factor of the light reflected by the diffuse reflection material and incident on the dichroic filter array 4 is lower than that when the regular reflection material is used. For this reason, it is more preferable to use a regular reflection material.
- the material of the primary reflector 3 is that a dielectric multilayer film is laminated on aluminum which is a regular reflective material, so that the incidence rate to the dichroic filter array 4 is the highest. Since it becomes high, it is preferable.
- the reflectance of the dielectric multilayer film coated on aluminum is 95 to 98%, which is higher than that of a single metal.
- the dichroic filter array 4 includes a dichroic filter 31 having a different selective transmission wavelength among the dichroic filters 31 that selectively transmit only light of a specific wavelength and reflect other light. (W direction) is arranged so as to form a cyclic permutation.
- dichroic filters 31 that selectively transmit the wavelengths of the three primary colors of R (red), G (green), and B (blue) are used. Arranged in the form of a circular permutation in the order of RGBRGB.
- the surface light source device may be an array form in which a cyclic permutation is made in another order (RBG). Further, a dichroic filter 31 that selectively transmits wavelengths of color light other than RGB (cyan, magenta, yellow, etc.) is added to the dichroic filter 31 that selectively transmits RGB wavelengths, or a dichroic filter 31 that selectively transmits RGB wavelengths. May be substituted for at least one of the above.
- the dichroic filter is disposed on the light guide plate exit surface as described above, for example, the light (light other than R) reflected by the dichroic filter (R filter) that selectively transmits the wavelength of the R light, It has been difficult to selectively transmit G or B light by re-entering a dichroic filter (that is, G filter or B filter) that selectively transmits the wavelength of either G or B light. This point was the same for the light reflected by the G filter and B filter.
- the dichroic filter row 4 is disposed on the incident surface 11, the light (first order) emitted from the light source 2 and incident on the dichroic filter 31 that selectively transmits one of the wavelengths of RGB light.
- a component (light) that matches the selective transmission wavelength of the dichroic filter 31 is transmitted, and the rest is reflected.
- the reflected light is further reflected by the primary reflector 3, and about 2/3 of the light enters the dichroic filter 31 having a selective transmission wavelength different from the previous one, and thereafter follows the same process as the primary incident light.
- the utilization factor of the light emitted from the light source is improved as compared with the prior art.
- either one or both of both ends in the T direction of the light guide plate 1 (at least one of the portion on the exit surface 12 side and the portion on the back surface 13 side). Is formed on the incident surface 11 so as to extend in the L direction starting from the facing portion 11A with the boundary 31A between adjacent elements of the dichroic filter row 4 (that is, the boundary between adjacent dichroic filters 31).
- a plurality of light guide path portions 6 were formed by dividing the groove 5 in the W direction.
- each of the RGB dichroic filters 31 and the plurality of light guide sections 6 divided in the W direction by the cutout grooves 5 are made to correspond one-to-one.
- the R light that has passed through the dichroic filter 31 that selectively transmits the wavelength of the R light and entered the light guide plate 1 is passed through the light guide path section that is separated from the others, and almost the same as the light of other colors (wavelengths).
- the light can be emitted from the emission surface 12 without being mixed.
- G light and B light Therefore, a decrease in color purity of each color light within the light guide plate 1 can be suppressed.
- the depth of the notch groove 5 is preferably 80% or more of the thickness of the light guide plate 1. Further, when the depth of the notch groove 5 exceeds 90% of the thickness of the light guide plate 1, the light guide path portion 6 is easily deformed in the W direction, so the depth of the notch groove 5 is equal to the thickness of the light guide plate 1. It is preferably 90% or less.
- the width of the notch groove 5 is preferably as small as possible.
- the width (size in the W direction) of the notch groove 5 is preferably set to be 20% or less of the width of the pitch q (see FIG. 6) of the dichroic filter row 4.
- the notch groove 5 is provided only on the exit surface 12 side, but the present invention is not limited to this, and the notch groove 5 is provided only on the back surface 13 side. It may also be provided on both the exit surface 12 side and the back surface 13 side. In the case where the notch groove 5 is provided on both the exit surface 12 side and the back surface 13 side, the total depth of the depth of the notch groove 5 on the exit surface 12 side and the depth of the notch groove 5 on the back surface 13 side is guided. It is set to be 80% or more and 90% or less of the plate thickness of the optical plate 1.
- the notch groove 5 may be formed simultaneously with the formation of the light guide plate 1 by a mold, for example. After the light guide plate 1 without the notch groove 5 is formed, the notch groove 5 is formed in the light guide plate 1 using a cutting means (cutting means). The notch groove 5 may be formed.
- the cutting means is not particularly limited, and various cutting means such as a diamond cutter, a wire cutter, a water cutter, a blade, and a laser can be applied.
- the light guide plate 1 can be formed not only by a mold but also by injection molding, extrusion molding, hot press molding, cutting, or the like, and the forming method is not particularly limited.
- FIG. 2A is a cross-sectional view schematically showing an example of a schematic configuration of a surface light source device according to an embodiment of the present invention
- FIG. 2B is a schematic configuration of a portion B shown in FIG.
- FIG. 4C is an exploded perspective view schematically showing a schematic configuration of a portion B shown in FIG.
- the dichroic filter Two colors of light transmitted through both sides of the boundary between adjacent elements 31A in the row 4 (that is, light transmitted through the adjacent dichroic filters 31) enter the same notch groove 5, mix, and exit from the light guide section 6. There is a possibility that color unevenness is caused by mixing with the light emitted from the surface 12 side.
- the opening at the starting point is made of a reflective material (shielding reflective material) 7 having a reflective surface on the side facing the light source 2. Shielding is effective.
- the process of forming the notch groove 5 can be facilitated by making the groove width of the notch groove 5 substantially constant from the start point to the end point.
- the material of the reflective material 7 is not particularly limited, and may be a regular reflective material or a diffuse reflective material.
- regular reflection material and the diffuse reflection material for example, the above-described regular reflection material and diffuse reflection material can be used.
- the material of the reflective material 7 is one in which a dielectric multilayer film is laminated on aluminum, which is a regular reflective material, because the reflectance is higher than that of a single metal as described above. It is preferable.
- FIG. 3 is sectional drawing which shows typically an example of schematic structure of the surface light source device concerning one Embodiment of this invention, (b) and (c) are respectively shown to (a). It is a top view which shows typically an example of schematic structure of the C section shown, (d) is a disassembled perspective view which shows typically schematic structure of the D section common to (b) and (c).
- the incident surface 11 (the facing portion 11A of the incident surface 11 with the boundary 31A between adjacent elements)
- the notch groove 5 is in a state where the facing portion 11A with the boundary 31A between adjacent elements which is the starting point is opened with a certain width.
- the notch groove 5 gradually starts from the closed state where the facing portion 11A with the boundary 31A between adjacent elements that is the starting point is not open. The groove width is increased. For this reason, the notch groove 5 is formed with the portion immediately below the incident surface 11 as the starting point of the opening. Therefore, light intrusion into the notch groove 5 can be prevented.
- the inclination of the groove wall of the notch groove 5 with respect to the L direction reduces light leakage from the light guide path portion 6 to the notch groove 5 as much as possible (the light guide path portion at the interface of the notch groove 5 with respect to the light guide path portion 6). It is preferable to set to an inclination range in which the total reflection condition is satisfied as much as possible on the 6 side.
- the manufacturing process is complicated by changing the groove width in the L direction as compared with the cases of (a) and (b) in FIG. Therefore, it is simple as long as the reflective material 7 is not provided.
- the end point in the extending direction of the notch groove 5 is not particularly limited, and can be set at an arbitrary position between the incident surface 11 and the surface on the opposite side. For example, as shown in (a) and (b) of FIG. 1 and (a) to (d) of FIG. 3, it may be arranged at the end opposite to the entrance surface 11 in the L direction, or You may coordinate to the appropriate L direction position between an end and the said starting point.
- 4 (a) and 4 (c) are cross-sectional views schematically showing an example of a schematic configuration of the surface light source device according to the embodiment of the present invention.
- a reflective material (reflective material for color classification) 8 having a reflective surface on the side facing the light guide path 6 is provided in the notch groove 5. It is preferable to arrange.
- FIG. 4A is a form in which the inner surface of the notch groove 5 is covered with a film-like reflecting material 8
- FIG. 4B is a form in which the entire groove of the notch groove 5 is filled with the reflecting material 8.
- FIG. 4C shows a form in which the plate-like reflecting material 8 is disposed in the groove of the cutout groove 5 with a gap (air layer) between the groove wall.
- the light incident on the interface with the notch groove 5 from within the light guide path 6 is reflected by the reflector 8 and returned to the light guide path 6.
- a part (several percent) of the light is absorbed by the reflector 8 and a loss corresponding to the absorbed amount occurs.
- FIG. 4C is harder to manufacture than the form of FIGS. 4A and 4B.
- the reflective material 8 for color classification it may be determined which of the above-mentioned advantages and disadvantages is adopted as to which of the forms shown in FIGS.
- the material of the reflection material 8 is not particularly limited, and for example, the above-described regular reflection material and diffuse reflection material can be used.
- the reflective material 8 has a higher reflectivity than that of a single metal as described above, and therefore a dielectric multilayer film is laminated on aluminum which is a regular reflective material. Is preferred.
- FIG. 5A is a perspective view schematically showing an example of a schematic configuration of the surface light source device according to the embodiment of the present invention
- FIG. 5B is a perspective view of the surface light source device shown in FIG. It is sectional drawing which shows typically schematic structure of the optical-plate entrance surface vicinity
- (c) is a top view which shows typically schematic structure of the light-guide plate entrance surface vicinity of the surface light source device shown to (a).
- the surface facing the light source 2 in the dichroic filter row 4 intersects with the W-direction orthogonal surface.
- a concave concave portion 41 having a single elliptical arc line is provided, and a parallel two-track line (hereinafter referred to as “ellipse”) formed by moving two focal points of the mother ellipse 14 including the concave portion 41 as an elliptical arc in the W direction.
- ellipse parallel two-track line
- the light source 2 is disposed on one of the lines 15 and 16 and the secondary reflector 9 is disposed on the other line.
- the secondary reflector 9 further reflects light reflected from the surface of the dichroic filter array 4 facing the light source 2 out of the light emitted from the light source 2, so that the light is reflected on the surface of the dichroic filter array 4 facing the light source 2. It is the reflective member to irradiate.
- the entire surface facing the light source 2 in the dichroic filter row 4 is an ellipse having a single line of intersection with the W-direction orthogonal surface.
- the concave shape is an arc shape.
- the cross section in the W direction orthogonal to the surface facing the light source 2 in the dichroic filter row 4 has an elliptical arc shape, and the light source 2 is placed on one of the elliptical bifocal lines 15 and 16 (elliptical bifocal line 15).
- the secondary reflector 9 is arranged on the other line (elliptical bifocal line 16), so that almost all the light emitted from the light source 2 and reflected by the dichroic filter row 4 is secondary reflector 9. , Is reflected, and enters the dichroic filter row 4 again. Therefore, light emitted from the light source 2 and reflected by the dichroic filter row 4 is hardly incident on the light source 2 and absorbed, and the utilization rate of the light source light is further improved accordingly.
- 6A and 6B are plan views schematically showing an example of a schematic configuration in the vicinity of the incident surface 11 of the surface light source device according to the embodiment of the present invention.
- the shape of the reflecting surface of the secondary reflector 9 is set in the W direction in the elements of the dichroic filter row 4.
- the repetitive shape of the prism two-surface connection shape (FIG. 6 (a)) and the repetitive shape of the lens shape of the columnar aspherical lens (preferably less than the pitch q) (pitch q or less). 6 (b)) or a surface shape in which these shapes (not shown) are mixed is preferable.
- element pitch of the dichroic filter row 4 indicates the pitch of each dichroic filter 31 constituting the dichroic filter row 4.
- the reflecting surface of the secondary reflector 9 has a prism two-surface connection shape in the W direction with an interval equal to or less than the pitch q of the dichroic filter 31 in the dichroic filter row 4 (more preferably, an interval less than the pitch q).
- a prismatic aspherical lens or a prismatic aspherical lens or a prismatic aspherical lens.
- the prism two-surface connection shape, the lens shape of the columnar aspheric lens, and the connection between them at an interval equal to or less than the pitch q of the dichroic filter 31 (more preferably, an interval less than the pitch q). It is more preferable that the surface shape repeat the same shape as any one of the shapes.
- 7A to 7C are sectional views schematically showing an example of a schematic configuration in the vicinity of the incident surface 11 of the surface light source device according to the embodiment of the present invention.
- the secondary reflector 9 has a minor axis 17 of the mother ellipse 14 whose reflected principal ray 18 includes the concave surface portion 41 as an elliptical arc, and the concave surface portion 41. It is preferable that the direction of the reflecting surface is adjusted so that it intersects the locus straight line formed by moving the intersection P with the trajectory in the W direction.
- the light source 2 has an intersection P between the minor axis 17 of the mother ellipse 14 whose radiation principal ray 19 includes the concave surface portion 41 as an elliptic arc and the concave surface portion 41 in the W direction. It is preferable that the light irradiation direction is adjusted so that it intersects with the locus straight line.
- the secondary reflector 9 and the light source 2 are combined with the form shown in FIG. 7A and the form shown in FIG. 7B. It is preferable.
- the dichroic filter array 4 is irradiated with at least one of the light reflected by the secondary reflector 9 and the light emitted from the light source 2. This ratio can be further increased, and the utilization factor of the light source light is further improved.
- the secondary reflector 9 for example, a plate-like reflector, a film-like reflector, or the like can be used.
- the material of the secondary reflector 9 is not particularly limited, and for example, the above-described regular reflection material and diffuse reflection material can be used. As described above, when the diffuse reflection material is used, the utilization factor of the light reflected by the diffuse reflection material and incident on the dichroic filter row 4 is lower than that when the regular reflection material is used. For this reason, it is more preferable to use a regular reflection material as the material of the secondary reflector 9.
- the material of the secondary reflector 9 is higher in reflectance than the single metal as described above, and has the highest re-incidence rate on the surface facing the light source 2 in the dichroic filter row 4. Therefore, it is preferable that a dielectric multilayer film is laminated on aluminum which is a regular reflection material.
- FIGS. 5A to 5C and FIGS. 7A to 7C as described above, the entire surface facing the light source 2 in the dichroic filter row 4 is connected to the W-direction orthogonal surface.
- the case where the intersecting line has a concave shape with a single elliptical arc has been described as an example. However, the present embodiment is not limited to this.
- FIG. 8 is a perspective view schematically showing an example of a schematic configuration in the vicinity of the incident surface 11 of the surface light source device according to the embodiment of the present invention.
- the concave surface portion 41 is formed in the T direction, which is the thickness direction of the light guide plate 1, on the surface facing the light source 2 in the dichroic filter row 4 as shown in FIGS. Only one may be provided as shown in (a) to (c) of FIG. 8, or a plurality may be provided as shown in FIG.
- the surface facing the light source 2 in the dichroic filter row 4 is replaced with a concave surface in which the line of intersection with the W-direction orthogonal surface is a single elliptical arc, as shown in FIG. May have a concave surface connection shape (elliptic arc connection shape) in which a plurality of elliptical arcs are connected to each other.
- a concave surface connection shape elliptic arc connection shape
- each of the light source 2 and the secondary reflector 9 is formed by moving the two focal points of each mother ellipse 14 including each concave surface portion 41 as an elliptical arc in the W direction that is the width direction of the light guide plate 1. Arranged on one of the ellipse bifocal lines 15 and 16 of the ellipse 14 and on the other line, respectively.
- the light source 2 is arranged on either one of the elliptical bifocal lines 15 and 16 (the elliptical bifocal line 15) of the mother ellipse 14 including each concave surface portion 41 as an elliptical arc, Since the secondary reflector 9 is arranged on the other line (elliptical bifocal line 16), almost all the light emitted from the light source 2 and reflected by the dichroic filter row 4 is incident on the secondary reflector 9. The light is reflected and enters the dichroic filter row 4 again. Therefore, light emitted from the light source 2 and reflected by the dichroic filter row 4 is hardly incident on the light source 2 and absorbed, and the utilization rate of the light source light is further improved accordingly.
- the plurality of concave surface portions 41 are provided on the surface of the dichroic filter row 4 facing the light source 2, so that the amount of light incident on the light guide plate 1 can be increased.
- 9A and 9B are cross-sectional views schematically showing an example of a schematic configuration of the surface light source device according to the embodiment of the present invention.
- the light source light is provided by adding a reflecting mirror 20 that reflects light leaking from the back surface 13 and irradiates the back surface 13.
- the utilization rate can be further improved.
- FIG. 9A shows an example in which the surface facing the light source 2 in the dichroic filter row 4 has a planar shape
- FIG. 9B shows the surface facing the light source 2 in the dichroic filter row 4 having an elliptical arc shape.
- Each example in the case of a concave shape is shown.
- the reflecting mirror 20 has a reflecting surface 20 a that faces the back surface 13, and the reflecting surface 20 a preferably has an area equal to or larger than the area of the back surface 13. If the area of the reflecting surface 20a of the reflecting mirror 20 is smaller than the area of the back surface 13, the ratio of the portion of the light leaking from the back surface 13 that is reflected by the reflecting mirror 20 and irradiated to the back surface 13 is disadvantageous. On the other hand, if the area of the reflecting surface 20a of the reflecting mirror 20 is larger than the area of the back surface 13, the ratio of the light that is reflected by the reflecting mirror 20 and irradiated to the back surface 13 out of the light leaking from the back surface 13 is large. Become. Therefore, the area of the reflecting surface 20a of the reflecting mirror 20 is more preferably larger than the area of the back surface 13.
- the light leaked from the back surface 13 is more improved when the reflecting surface 20a of the reflecting mirror 20 is formed into a concavo-convex shape instead of a uniform planar shape. It is preferable because the back surface 13 can be irradiated more uniformly by reflecting in a random direction.
- the surface light source device of the present invention can be suitably used for a backlight of a transmissive LCD or a transflective LCD, an auxiliary light source (front light) of a reflective LCD, or the like.
Abstract
Description
2 光源
3 1次反射子
4 ダイクロイックフィルタ列
5 切欠溝
6 導光路部
7 反射材(遮蔽用反射材)
8 反射材(色分け用反射材)
9 2次反射子
11 入射面(導光板入射面)
11A 対面部位
12 射出面(導光板射出面)
13 裏面(導光板裏面)
14 母楕円
15 楕円二焦点線(平行二軌跡直線)
16 楕円二焦点線(平行二軌跡直線)
17 短軸
18 反射主光線
19 放射主光線
20 反射鏡
20a 反射面
31 ダイクロイックフィルタ
31A 隣接要素間境界
41 凹面部
Claims (10)
- 光源と、
板の長さ方向の少なくとも一端部を導光板入射面とし、前記板の厚さ方向の両端部をそれぞれ導光板射出面、導光板裏面として前記光源から発した光を前記導光板入射面から導入し、前記導光板射出面のほぼ全域に広げて射出させる前記板からなる導光板と、
前記光源から放射された光を反射して前記導光板入射面に照射する1次反射子とを有する面光源装置において、
さらに、特定波長の光のみを選択透過させて他の光は反射するダイクロイックフィルタのうち選択透過波長の相異なるダイクロイックフィルタを導光板入射面上に、導光板の幅方向で巡回順列をなすように配設してなるダイクロイックフィルタ列と、
前記導光板の厚さ方向両端部のいずれか一方または両方を、前記ダイクロイックフィルタ列の隣接要素間境界である、互いに隣接するダイクロイックフィルタ間の境界との対面部位を起点に導光板の長さ方向に延在するように設けた切欠溝にて導光板の幅方向に分割してなる複数の導光路部とを有することを特徴とする面光源装置。 - 前記切欠溝は、導光板入射面において開口しており、該導光板入射面における開口が、前記光源との対面側を反射面とする遮蔽用反射材で遮蔽されていることを特徴とする請求項1に記載の面光源装置。
- 前記切欠溝は、導光板入射面から、延在方向の終点に向かうにつれ、溝幅がゼロから増加するかあるいはゼロから増加した後に一定となることを特徴とする請求項1に記載の面光源装置。
- さらに、前記切欠溝の内部に、前記導光路部との対面側を反射面とする色分け用反射材を配設されていることを特徴とする請求項1~3のいずれか一項に記載の面光源装置。
- 前記ダイクロイックフィルタ列の光源対向面は、前記導光板の幅方向直交面との交線が単一の楕円弧形になる凹面形状もしくは複数の楕円弧の連結形になる凹面連結形状の凹面部を有し、
前記凹面部を楕円弧として含む母楕円の二焦点を前記導光板の幅方向に移動してなる平行二軌跡直線のいずれか一方の線上に前記光源が配置され、他方の線上に、前記光源から放射された光のうち前記ダイクロイックフィルタ列の光源対向面で反射された光をさらに反射して前記ダイクロイックフィルタ列の光源対向面に照射する2次反射子が配置されていることを特徴とする請求項1~4のいずれか一項に記載の面光源装置。 - 前記光源が、白色LED光源、RGB-LED光源、マルチカラーLED光源、有機EL光源、レーザ光源群より選ばれる少なくとも一種の光源であることを特徴とする請求項1~5のいずれか一項に記載の面光源装置。
- 前記2次反射子の反射面形状が、前記導光板の幅方向に前記ダイクロイックフィルタ列における要素ピッチである、ダイクロイックフィルタのピッチ以下の間隔で、プリズムの二面連結形状、柱状非球面レンズのレンズ形状、およびプリズムの二面連結形状と柱状非球面レンズのレンズ形状とが混在した連結形状のうち何れか一種の形状と同じ形状を繰り返す面形状とされていることを特徴とする請求項5または6のいずれか一項に記載の面光源装置。
- 前記2次反射子は、その反射主光線が、前記凹面部を楕円弧として含む母楕円の短軸と前記凹面部との交点を前記導光板の幅方向に移動してなる軌跡直線と交わるように、その反射面の向きが調節されていることを特徴とする請求項5~7のいずれか一項に記載の面光源装置。
- 前記光源は、その放射主光線が、前記凹面部を楕円弧として含む母楕円の短軸と前記凹面部との交点を前記導光板の幅方向に移動してなる軌跡直線と交わるように、光の照射方向が調節されていることを特徴とする請求項5~8のいずれか一項に記載の面光源装置。
- 前記導光板裏面と対向する反射鏡をさらに備え、
該反射鏡における前記導光板裏面との対向側は、前記導光板裏面の面積以上の面積を有りする反射面であることを特徴とする請求項1~9のいずれか一項に記載の面光源装置。
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CN200980129873XA CN102112799B (zh) | 2008-08-05 | 2009-08-04 | 面光源装置 |
US13/056,174 US8054404B2 (en) | 2008-08-05 | 2009-08-04 | Surface light source device |
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WO2012026164A1 (ja) * | 2010-08-24 | 2012-03-01 | シャープ株式会社 | 照明装置および表示装置 |
JP2012169271A (ja) * | 2011-02-11 | 2012-09-06 | Lg Innotek Co Ltd | 表示装置 |
WO2021065255A1 (ja) * | 2019-10-03 | 2021-04-08 | 株式会社ジャパンディスプレイ | 照明装置及び表示装置 |
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CN102112799B (zh) | 2013-06-05 |
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