WO2013046921A1 - Polariseur, élément optique polarisant, source lumineuse et dispositif d'affichage d'image - Google Patents

Polariseur, élément optique polarisant, source lumineuse et dispositif d'affichage d'image Download PDF

Info

Publication number
WO2013046921A1
WO2013046921A1 PCT/JP2012/069768 JP2012069768W WO2013046921A1 WO 2013046921 A1 WO2013046921 A1 WO 2013046921A1 JP 2012069768 W JP2012069768 W JP 2012069768W WO 2013046921 A1 WO2013046921 A1 WO 2013046921A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
polarizer
substrate
dielectric
optical element
Prior art date
Application number
PCT/JP2012/069768
Other languages
English (en)
Japanese (ja)
Inventor
友嗣 大野
雅雄 今井
鈴木　尚文
瑞穂 冨山
Original Assignee
日本電気株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本電気株式会社 filed Critical 日本電気株式会社
Publication of WO2013046921A1 publication Critical patent/WO2013046921A1/fr

Links

Images

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2073—Polarisers in the lamp house
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3058—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state comprising electrically conductive elements, e.g. wire grids, conductive particles
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G02F1/133548—Wire-grid polarisers

Definitions

  • the present invention relates to a polarizer that polarizes light.
  • Such a projector includes a light source, an illumination optical system that receives light emitted from the light source, a modulation element that modulates and emits light from the illumination optical system according to a video signal, and light from the modulation element on a screen. And a projection optical system for projecting onto the screen.
  • LED Light Emitting Diode
  • a polarizing element such as a liquid crystal panel may be used as the modulation element.
  • the non-polarized light needs to be converted into a specific polarization state in order to efficiently use the emitted light of the LED as the projection light.
  • the light source may be provided with a polarizing optical element that converts non-polarized light from the LED into light having a specific polarization state and emits the light.
  • a polarizing optical element an element using a wire grid polarizer that is excellent in light utilization efficiency and can be easily reduced in thickness is attracting attention.
  • FIG. 1 is a diagram showing an example of a wire grid polarizer. As shown in FIG. 1, in the wire grid polarizer, a plurality of metal wires 102, which are linear metal members, are arranged on a substrate 101 in a grid.
  • TM polarized light that is a polarization component polarized in the direction A perpendicular to the extending direction of the metal wire 102 in the incident light 111. Passes through the wire grid polarizer and exits as transmitted light 112.
  • TE polarized light that is a polarization component polarized in a direction B orthogonal to the direction A in the incident light 111 is reflected by a wire grid polarizer and returned to the light incident side as reflected light 113 (Patent Document). 1 and 2).
  • FIGS. 2 and 3 are diagrams showing an example of a polarizing optical element using a wire grid polarizer.
  • the polarizing optical element shown in FIG. 2 includes a ⁇ / 4 plate 302 provided on a light emitting element 301 that is an LED, and a wire grid polarizer 303 provided on the ⁇ / 4 plate 302.
  • TM polarized light of the incident light is transmitted through the wire grid polarizer 303 and emitted from the polarizing optical element.
  • the TE polarized light in the incident light is reflected by the wire grid polarizer 303.
  • the reflected light enters the light emitting element 301 through the ⁇ / 4 plate 302, is further reflected by the light emitting element 301, and reenters the wire grid polarizer 303 through the ⁇ / 4 plate 302.
  • the light re-entering the wire grid polarizer 303 passes through the ⁇ / 4 plate 302 twice and becomes TM polarized light, so that it passes through the wire grid polarizer 303 and is emitted from the polarization optical element.
  • the light emitted from the light emitting element 301 is converted into TM polarized light and emitted.
  • the polarizing optical element shown in FIG. 3 has a depolarizing element 302 ′ that converts light into non-polarized light and emits it, instead of the ⁇ / 4 plate 302.
  • the light re-entering the wire grid polarizer 303 is unpolarized because it passes through the depolarization element 302 '. Therefore, TM polarized light of the re-incident light is transmitted through the wire grid polarizer 303, and TE polarized light is further reflected by the wire grid polarizer 303. By repeating such reflection, the light emitted from the light emitting element 301 is converted into TM polarized light and emitted.
  • the light loss can be reduced by re-entering the light returned to the light incident side into the wire grid polarizer.
  • the light extraction efficiency is not sufficient.
  • the present invention has been made in view of the above problems, and a polarizer, a polarizing optical element, and a light source capable of increasing light extraction efficiency when converting non-polarized light into light having a specific polarization state. And it aims at providing an image display device.
  • a first polarizer according to the present invention includes a substrate, a first dielectric portion provided on the substrate, and a metal portion provided on the first dielectric portion, the first dielectric The portion is provided so as to become smaller from the substrate toward the metal portion.
  • a second polarizer according to the present invention includes a substrate, a first dielectric part provided on the substrate, and a metal part provided on the first dielectric part,
  • the dielectric part has an inclined surface from the substrate toward the metal part, and the side surface of the first dielectric part is an inclined surface formed to incline from the substrate toward the metal part.
  • the surface of the dielectric portion on which the metal portion is provided is smaller than the surface on which the substrate of the first dielectric portion is provided.
  • the polarizing optical element according to the present invention includes a polarizer and a polarization state conversion element that is provided on the structure and emits light while changing the polarization state of incident light.
  • the light source of the present invention includes a polarizing optical element and a light emitting element that emits light to the polarizing optical element.
  • the image display device of the present invention has a light source.
  • the present invention it is possible to increase the light extraction efficiency when converting non-polarized light into light having a specific polarization state.
  • FIG. 1 is a layout diagram illustrating an example of a configuration of an image display device using a light source according to a first embodiment of the present invention.
  • FIG. 1 is a layout diagram illustrating an example of a configuration of an image display device using a light source according to a first embodiment of the present invention. It is a figure which shows the evaluation result of the integrated transmittance
  • FIG. 4 is a perspective view schematically showing the light source of the first embodiment of the present invention.
  • the thickness of each layer is very thin, and the difference in thickness between the layers is large, so it is difficult to illustrate each layer with an accurate scale and ratio. For this reason, in the drawings, the layers are not schematically drawn but are shown schematically.
  • the light source 10 of this embodiment includes a light emitting element 1 and a polarizing optical element 2 provided on the light emitting element 1.
  • the light emitting element 1 is, for example, an LED and emits light to the polarizing optical element 2.
  • emitted from the light emitting element 1 is non-polarized light, and assumes that it is visible light.
  • the polarizing optical element 2 converts the light from the light emitting element 1 into a specific polarization state and emits it.
  • the polarizing optical element 2 includes a wave plate 3 provided on the light emitting element 1 and a polarizer 4 which is a wire grid polarizer provided on the wave plate 3.
  • the light emitting element 1 and the wave plate 3 are in close contact with each other, but actually, they may not be in close contact.
  • the wave plate 3 is an example of a polarization state conversion element that changes the polarization state of light. More specifically, the wave plate 3 converts the linearly polarized light into circularly polarized light (elliptical polarized light) by generating a phase difference of 1 ⁇ 4 wavelength of the light between the linearly polarized light vibrating in directions perpendicular to each other.
  • the ⁇ / 4 plate converts circularly polarized light (elliptical polarized light) into linearly polarized light.
  • the wave plate 3 is preferably a zero order wave plate.
  • Examples of the material of the wave plate 3 include inorganic anisotropic crystals such as sapphire and quartz, anisotropic films such as polycarbonate, and nanostructure anisotropic media.
  • the polarizer 4 has a substrate 11 and a plurality of convex portions 15 laminated on the substrate 11 in the order of the first dielectric layer 12, the metal layer 13, and the second dielectric layer 14.
  • the first dielectric layer 12 is an example of a first dielectric part
  • the metal layer 13 is an example of a metal part
  • the second dielectric layer 12 is an example of a second dielectric part.
  • each convex portion 15 is an example of a structure.
  • the upper surface of the substrate 11 is the XY plane
  • the direction orthogonal to the XY plane is the Z direction.
  • the substrate 11 is formed of a substantially transparent material in the wavelength band of light emitted from the light emitting element 1.
  • the material of the substrate 11 include optical glass such as quartz glass and borosilicate crown, inorganic crystals such as sapphire and quartz, and transparent plastic such as polyetherimide resin and polystyrene resin.
  • Each convex portion 15 on the substrate 11 has a linear shape extended in the Y direction, which is the first direction in the upper surface of the substrate 11. Further, the plurality of convex portions 15 are periodically arranged in a grid shape, more specifically, in the X direction, which is a second direction different from the first direction.
  • the first dielectric layer 12 of each convex portion 15 has a tapered structure (inclined surface) in which the cross-sectional area of the first dielectric layer 12 decreases from the substrate 11 toward the metal layer 13.
  • the width of the first dielectric layer 12 is equal to the period of the protrusions 15 on the contact surface between the substrate 11 and the first dielectric layer 12, and the metal layer 13 of the first dielectric layer 12 is in contact with the taper structure. It is desirable that the surface and the surface of the metal layer 13 in contact with the first dielectric layer 12 have the same size.
  • the taper may be smooth as long as it is linear, exponential, or parabola.
  • the first dielectric layer 12 has a refractive index of 1.5 to 2.0, for example, and a height of about 10 nm to 150 nm.
  • the material of the first dielectric layer 12 is not particularly limited. For example, oxides such as silicon oxide, titanium oxide and aluminum oxide, nitrides such as silicon nitride, magnesium fluoride and calcium fluoride are used. And dielectric materials such as fluoride.
  • the metal layer 13 formed on the first dielectric layer 12 has a high light reflectance in the wavelength band of light emitted from the light emitting element 1, such as aluminum, silver, tin, and alloys thereof. It is desirable to be formed of a material.
  • the material of the second dielectric layer 14 formed on the metal layer 13 is not particularly limited.
  • oxides such as silicon oxide, titanium oxide and aluminum oxide, nitrides such as silicon nitride, and fluorine are used.
  • dielectric materials such as fluorides such as magnesium fluoride and calcium fluoride.
  • the second dielectric layer 14 has a refractive index of 1.0 to 2.0 and a height of 50 nm to 200 nm, for example.
  • the size of the second dielectric layer 14 in the XY direction is preferably equal to the size of the metal layer 13.
  • the second dielectric layer 14 is in close contact with the wave plate 3.
  • a protective material or an adhesive material may be inserted between the second dielectric layer 14 and the wave plate 3.
  • the non-polarized light emitted from the light emitting element 1 enters the surface on which the convex portion 15 of the polarizer 4 is formed via the wave plate 3. Since non-polarized light is non-polarized even after passing through the wave plate 3, light incident on the polarizer 4 is also non-polarized.
  • TM polarized light which is a polarization component perpendicular to the Y direction that is the extending direction of each convex portion 15, is transmitted through each convex portion 15 and further transmitted through the substrate 11 and emitted.
  • TE polarized light that is a polarization component parallel to the Y direction that is the extending direction of each convex portion 15 is reflected by the metal layer 13 of each convex portion 15.
  • the reflected TE polarized light passes through the wave plate 3 and becomes circularly polarized light, is reflected by the light emitting element 1, further passes through the wave plate 3, and becomes TM polarized light and reenters the polarizer 4. Therefore, the re-incident light is transmitted through the polarizer 4 and emitted. For this reason, the light emitted from the polarizer 4 becomes TM polarized light having a specific polarization state.
  • the incident side medium on the light incident side of the metal layer 13 is closer to the absolute value of the refractive index of the metal wire, the TE-polarized light absorption by the metal layer 13 increases, and the TE-polarized light reflectance is increased. Is reduced. For this reason, it is desirable that the incident side medium has a refractive index as small as possible.
  • the incident side medium becomes the wave plate 3. Since the degree of freedom with respect to the refractive index of the wave plate 3 is low, the incident side medium becomes large. For this reason, in the present embodiment, the second dielectric layer 14 having a refractive index of about 1.0 to 2.0 is provided on the metal layer 13, thereby reducing the refractive index of the incident side medium. The reflectance of polarized light is improved.
  • the first dielectric layer 12 having a taper between the substrate 11 and the metal layer 13
  • the first dielectric layer is formed on the metal layer 13 side of the first dielectric layer 12.
  • the volume occupied by air is larger than 12 and the volume occupied by the first dielectric layer 12 is larger on the substrate 11 side of the first dielectric layer 12 than air.
  • Fresnel reflection that occurs at the interface between media having different refractive indexes is less likely to occur as the difference in refractive index between the media is smaller. Therefore, the effective refractive index is directed from the substrate 11 toward the metal layer 13 as described above. If it changes continuously, it becomes possible to reduce reflection and to improve the transmittance of TM polarized light.
  • FIG. 5 is a diagram for explaining a manufacturing method for manufacturing the polarizer 4 included in the light source 10 shown in FIG.
  • the manufacturing method demonstrated below is only an example, Comprising: It is not limited to this.
  • the first dielectric layer 12 is formed on the substrate 11 by using, for example, a vapor deposition method, and then the first dielectric layer is formed by using, for example, a sputtering film forming method.
  • a metal layer 13 is formed on 12, and a second dielectric layer 14 is formed on the metal layer 13. Further, a resist layer 21A is laminated on the second dielectric layer 14 so as to be a thin film.
  • the resist layer 21A is patterned in a grid shape to form a plurality of resist layers 21B arranged in a grid shape.
  • the patterning method is not particularly limited, and examples thereof include a photolithography technique that is a mask exposure method, an imprint method, and the like.
  • etching is performed so as to penetrate the second dielectric layer 14, the metal layer 13, and the first dielectric layer 12, and arranged in a grid pattern. A plurality of convex portions 15 are formed.
  • the first dielectric layer 12 is removed so that the first dielectric layer 12 has a tapered structure.
  • a wet etching method or a dry etching method can be used depending on the materials of the first dielectric layer 12, the metal layer 13, and the second dielectric layer.
  • the resist layer 21B is combined with oxygen radicals, and is replaced with a gaseous reaction product such as CO or CO 2 and removed.
  • FIG. 6 is a layout diagram showing an example of the configuration of the image display apparatus having the light source 10 shown in FIG.
  • the image display apparatus shown in FIG. 6 is a projector that projects light onto a screen to form an image on the screen.
  • the projector 500 includes light sources 501R, 501G, and 501B, optical elements 502R, 502G, and 502B, liquid crystal panels 503R, 503G, and 503B, a cross dichroic prism 504, and a projection optical system 505.
  • Each of the light sources 501R, 501G, and 501B has the same structure as the light source 10 shown in FIG.
  • the light emitting elements 1 of the light sources 501R, 501G, and 501B generate light having different wavelengths.
  • red (R) light is emitted from the light source 501R
  • green (G) light is emitted from the light source 501G
  • blue (B) light is emitted from the light source 501B.
  • Each of the optical elements 502R, 502G, and 502B guides the respective color lights generated from the light sources 501R, 501G, and 501B to the liquid crystal panels 503R, 503G, and 503B, respectively, and enters the liquid crystal panels.
  • the liquid crystal panels 503R, 503G, and 503B are spatial light modulation elements that modulate and emit incident color light according to a video signal.
  • the cross dichroic prism 504 combines and outputs the modulated lights emitted from the liquid crystal panels 503R, 503G, and 503B.
  • the projection optical system 505 projects the combined light emitted from the cross dichroic prism 504 onto the screen 600 and displays an image corresponding to the video signal on the screen 600.
  • FIG. 7 is a layout diagram showing another example of the configuration of the projector according to the present embodiment.
  • the projector 500 ′ includes light sources 501 ⁇ / b> R, 501 ⁇ / b> G, and 501 ⁇ / b> B, a light guide 506, a liquid crystal panel 507, and a projection optical system 508.
  • the light guide 506 synthesizes each color light generated from the light sources 501R, 501G, and 501B and outputs the combined light to the liquid crystal panel 507.
  • the liquid crystal panel 507 is a spatial light modulation element that modulates incident combined light according to a video signal and emits the modulated light.
  • the projection optical system 508 projects the modulated light emitted from the liquid crystal panel 507 onto the screen 600 and displays an image corresponding to the video signal on the screen 600.
  • a liquid crystal panel is used as the spatial light modulation element.
  • the modulation element is not limited to the liquid crystal panel and can be changed as appropriate.
  • FIG. 8 is a diagram showing an evaluation result of the integrated transmittance in the light source 10 of the present embodiment.
  • the integrated transmittance indicates a ratio of light emitted from the polarizer 4 at an emission angle included in the usable angle range in the light emitted from the light emitting element 1.
  • the usable angle range is an angle range that can be actually used out of light emitted in various directions from the polarization conversion element.
  • the light sources 501R and 501G are used.
  • the range of the emission angle of light that can be taken into the optical elements 502R, 502G, and 502B.
  • the substrate 11 is a glass having a refractive index of 1.5
  • the first dielectric layer 12 is a dielectric having a refractive index of 1.8
  • the metal layer 13 is Al
  • the second dielectric layer 14 is a dielectric having a refractive index of 1.5. Formed with.
  • the width of the metal layer 13 was 42 nm, the height was 140 nm, and the period of the convex portions 15 was 110 nm.
  • the height of the first dielectric was 50 nm, the width was 110 nm on the substrate 11 side, and 42 nm on the metal layer 13 side.
  • the height of the second dielectric was 100 nm and the width was 42 nm.
  • the wave plate 3 is a zero order uniaxial quarter wave plate of quartz.
  • the light emitted from the light-emitting element 1 is assumed to be completely non-polarized, the light distribution is Lambertian, and the reflectance of the light-emitting element 1 is assumed to be 100%.
  • E is the evaluation result of the wire grid polarizer alone
  • F is the evaluation result of the light source 10
  • G is the evaluation result of the light source of the related technology shown in FIG. 1
  • H is the output light of the light emitting element 1. This is the result when all polarized light is emitted.
  • the integrated light transmittance of the light source 10 of this embodiment is improved by about 1% compared to the light source of the related art shown in FIG.
  • the first dielectric layer 12 is tapered, it is possible to improve the transmittance of TM polarized light. It is possible to increase the light extraction efficiency when converting to light.
  • the second dielectric layer 14 is provided on the metal layer 13, even if the polarizer 4 is brought into close contact with the wave plate 3, it is possible to suppress the decrease in the reflectance of TE-polarized light, or The reflectance of TE polarized light can be improved. Accordingly, it is possible to suppress a decrease in the reflectance of TE-polarized light or to improve the reflectance of TE-polarized light while suppressing leakage light, so that the light when converting non-polarized light into light of a specific polarization state can be obtained. The extraction efficiency can be increased.
  • FIG. 9 is a perspective view schematically showing a light source according to the second embodiment of the present invention.
  • a light source 10A of this embodiment shown in FIG. 9 has a depolarizing element 3A instead of the wave plate 3 with respect to the light source 10 shown in FIG.
  • the depolarization element 3A is an example of a polarization state conversion element that changes the polarization state of light. More specifically, the depolarizing element 3A emits incident light as non-polarized light.
  • Examples of the material for the depolarizing element 3A include inorganic anisotropic crystals such as sapphire and quartz, and anisotropic films such as polycarbonate, whose thickness varies depending on the position in the plane.
  • the light emitting element 1 and the depolarizing element 3 ⁇ / b> A are in close contact with each other, but actually, they may not be in close contact.
  • the non-polarized light emitted from the light emitting element 1 enters the surface on which the convex portion 15 of the polarizer 4 is formed via the depolarizing element 3A. Since non-polarized light is non-polarized even after passing through the depolarizer 3A, the light incident on the polarizer 4 is also non-polarized.
  • TM polarized light which is a polarization component perpendicular to the Y direction that is the extending direction of each convex portion 15, is transmitted through each convex portion 15 and further transmitted through the substrate 11 and emitted.
  • TE polarized light that is a polarization component parallel to the Y direction that is the extending direction of each convex portion 15 is reflected by the metal layer 13 of each convex portion 15.
  • the reflected TE-polarized light passes through the wave plate 3 to become non-polarized light, is reflected by the light emitting element 1, passes through the wave plate 3, and re-enters the polarizer 4 without being polarized. Therefore, TM polarized light out of the re-incident light is transmitted through the polarizer 4, and TE polarized light out of the re-incident light is reflected again.
  • FIG. 10 is a diagram showing an evaluation result of the integrated transmittance in the light source 10A of the present embodiment.
  • the depolarizing element 3A is assumed to make incident light completely non-polarized, and the configuration of other members is the same as that of the first embodiment.
  • E is the evaluation result of the wire grid polarizer alone
  • F is the evaluation result of the light source 10A
  • G is the evaluation result of the light source of the related technology shown in FIG. 1
  • H is the output of the light emitting element 1. This is the result when all the incident light is emitted in a polarized state.
  • FIG. 11 is a diagram showing a side surface and an upper surface of an optical element according to the third embodiment of the present invention.
  • the optical element 200 of the present embodiment includes a substrate 201, a dielectric part 202 provided on the substrate 201, and a metal part 203 provided on the dielectric part 202.
  • the dielectric portion 202 is an example of a first dielectric portion, and the dielectric portion 202 and the metal portion 203 constitute a structure 204.
  • the upper surface of the substrate 201 is the XY plane, and the direction orthogonal to the XY plane is the Z direction.
  • the dielectric part 202 has a structure that decreases from the substrate 201 toward the metal part 203.
  • the bottom surface that is a surface in contact with the substrate 201 of the dielectric portion 202 is rectangular, and the side surface along the Y direction of the dielectric portion 202 has a tapered structure.
  • the length of the metal part 203 in the Y direction is W1
  • the length of the metal part 203 in the X direction is W2.
  • the length in the Y direction of the upper surface which is the surface in contact with the metal portion 203 of the dielectric portion 202, is W1
  • the length in the X direction of the upper surface of the dielectric portion 202 is W2.
  • TM polarized light which is a polarization component orthogonal to the Y direction, of incident light incident on the functional region 210 is transmitted through the substrate 201
  • TE polarized light which is a polarization component parallel to the Y direction, of the incident light is the metal portion 203. Reflect on.
  • the functional region 210 is a range within ⁇ W1 / 2 in the Y direction from the center of the upper surface of the dielectric part 202 and within ⁇ (W2 / 2 + S) in the X direction from the center of the upper surface of the dielectric part 202. Note that S is half ⁇ / 2 of the wavelength ⁇ of light incident on the optical element 200.
  • the optical element 200 functions as a polarizer and the dielectric portion 202 decreases from the substrate 201 toward the metal portion 203 as in the first and second embodiments. , It becomes possible to suppress Fresnel reflection of TM polarized light, and to increase the light extraction efficiency when converting non-polarized light into light of a specific polarization state.
  • FIGS. 12 to 19 are diagrams showing examples of other shapes of the optical element 200.
  • the side surface facing the Y direction on the substrate 201 has a tapered structure.
  • the bottom surface and the top surface of the dielectric 202 are elliptical. Note that, on the bottom surface and the top surface of the dielectric 202, the straight axis is provided along the Y direction.
  • the side surface of the dielectric 202 is perpendicular to the substrate 201 from the bottom surface to a certain position, and a tapered structure is provided from that position.
  • the side surface of the dielectric 202 has a staircase shape.
  • a plurality of structures 204 are provided.
  • the structures 204 are arranged in a one-dimensional direction.
  • the functional area 210 of the optical element 200 is a combination of the functional areas of the structures 204, and therefore, in the one-dimensional direction in which the structures 204 are juxtaposed, such as light from a line light source.
  • the optical element 200 can be made to function as a polarizer even for light having a large spread.
  • the optical element 200 can function as a polarizer.
  • the structures 204 are arranged in parallel so that there is no gap between the bottom surfaces of the dielectrics 202 of the structures 204. However, as shown in FIG. There may be a gap between the bottom surfaces of the body 202.
  • the structure 204 shown in FIGS. 11 and 12 is used as the structure 204.
  • the structure 204 has the structure shown in FIGS. 13, 14, and 15. There may be.
  • the structures 204 shown in FIG. 12 are juxtaposed in a two-dimensional direction.
  • the functional area 210 that functions as a polarizer and the non-functional area 211 that does not function as a polarizer are alternately provided, one of polarized light and non-polarized light depends on the incident position of light from the light source. Can be selectively output.
  • the illustrated configuration is merely an example, and the present invention is not limited to the configuration.
  • the numerical values, materials, and the like in the above-described embodiments are illustrative, and can be changed as appropriate.
  • the depolarizing element 3A can be omitted.

Abstract

La présente invention porte sur un polariseur apte à augmenter le rendement d'extraction de lumière lorsqu'une lumière non polarisée est convertie en lumière dans un état de polarisation spécifié. Le polariseur comporte un substrat, une première partie diélectrique installée sur le substrat et une partie métallique installée sur la première partie diélectrique, la première partie diélectrique étant installée de manière à diminuer en dimension depuis le substrat vers la partie métallique.
PCT/JP2012/069768 2011-09-27 2012-08-02 Polariseur, élément optique polarisant, source lumineuse et dispositif d'affichage d'image WO2013046921A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-211505 2011-09-27
JP2011211505 2011-09-27

Publications (1)

Publication Number Publication Date
WO2013046921A1 true WO2013046921A1 (fr) 2013-04-04

Family

ID=47994974

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/069768 WO2013046921A1 (fr) 2011-09-27 2012-08-02 Polariseur, élément optique polarisant, source lumineuse et dispositif d'affichage d'image

Country Status (2)

Country Link
JP (1) JPWO2013046921A1 (fr)
WO (1) WO2013046921A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016045466A (ja) * 2014-08-26 2016-04-04 大日本印刷株式会社 調光装置および調光装置の設置方法
JP6230689B1 (ja) * 2016-12-28 2017-11-15 デクセリアルズ株式会社 偏光板及びその製造方法、並びに光学機器
JP6302040B1 (ja) * 2016-12-28 2018-03-28 デクセリアルズ株式会社 偏光板及びその製造方法、並びに光学機器
JP2018109754A (ja) * 2016-12-28 2018-07-12 デクセリアルズ株式会社 偏光板及びその製造方法、並びに光学機器
JP2018189980A (ja) * 2018-07-19 2018-11-29 デクセリアルズ株式会社 偏光板
JP2019536080A (ja) * 2016-11-22 2019-12-12 モックステック・インコーポレーテッド 両側において高い反射率を有するワイヤグリッド偏光子
JP2021033049A (ja) * 2019-08-23 2021-03-01 デクセリアルズ株式会社 偏光板及び光学機器
WO2021241439A1 (fr) * 2020-05-25 2021-12-02 デクセリアルズ株式会社 Plaque de polarisation, son procédé de fabrication et dispositif optique

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003519818A (ja) * 2000-01-11 2003-06-24 モックステック 可視スペクトル用の埋込み型ワイヤ・グリッド偏光子
JP2006330178A (ja) * 2005-05-24 2006-12-07 Sony Corp 光学装置及び光学装置の製造方法
JP2009087921A (ja) * 2007-06-11 2009-04-23 Rohm & Haas Denmark Finance As 成形複屈折反射偏光子を含むバックライト
JP2009134251A (ja) * 2007-08-08 2009-06-18 Rohm & Haas Denmark Finance As 拘束された非対称拡散体を備える光学素子
JP2011028008A (ja) * 2009-07-27 2011-02-10 Hitachi Displays Ltd 液晶表示装置
JP2011186252A (ja) * 2010-03-09 2011-09-22 Ricoh Co Ltd 偏光変換素子

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003519818A (ja) * 2000-01-11 2003-06-24 モックステック 可視スペクトル用の埋込み型ワイヤ・グリッド偏光子
JP2006330178A (ja) * 2005-05-24 2006-12-07 Sony Corp 光学装置及び光学装置の製造方法
JP2009087921A (ja) * 2007-06-11 2009-04-23 Rohm & Haas Denmark Finance As 成形複屈折反射偏光子を含むバックライト
JP2009134251A (ja) * 2007-08-08 2009-06-18 Rohm & Haas Denmark Finance As 拘束された非対称拡散体を備える光学素子
JP2011028008A (ja) * 2009-07-27 2011-02-10 Hitachi Displays Ltd 液晶表示装置
JP2011186252A (ja) * 2010-03-09 2011-09-22 Ricoh Co Ltd 偏光変換素子

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016045466A (ja) * 2014-08-26 2016-04-04 大日本印刷株式会社 調光装置および調光装置の設置方法
JP7187745B2 (ja) 2016-11-22 2022-12-13 モックステック・インコーポレーテッド 両側において高い反射率を有するワイヤグリッド偏光子
JP2019536080A (ja) * 2016-11-22 2019-12-12 モックステック・インコーポレーテッド 両側において高い反射率を有するワイヤグリッド偏光子
CN108254822A (zh) * 2016-12-28 2018-07-06 迪睿合株式会社 偏光板及其制造方法、以及光学设备
CN108254821B (zh) * 2016-12-28 2022-01-11 迪睿合株式会社 偏光板及其制造方法、以及光学设备
JP2018106129A (ja) * 2016-12-28 2018-07-05 デクセリアルズ株式会社 偏光板及びその製造方法、並びに光学機器
CN108254821A (zh) * 2016-12-28 2018-07-06 迪睿合株式会社 偏光板及其制造方法、以及光学设备
JP2018109754A (ja) * 2016-12-28 2018-07-12 デクセリアルズ株式会社 偏光板及びその製造方法、並びに光学機器
JP2018106130A (ja) * 2016-12-28 2018-07-05 デクセリアルズ株式会社 偏光板及びその製造方法、並びに光学機器
US10209421B2 (en) 2016-12-28 2019-02-19 Dexerials Corporation Polarizing plate, method of manufacturing the same, and optical apparatus
JP6302040B1 (ja) * 2016-12-28 2018-03-28 デクセリアルズ株式会社 偏光板及びその製造方法、並びに光学機器
JP6230689B1 (ja) * 2016-12-28 2017-11-15 デクセリアルズ株式会社 偏光板及びその製造方法、並びに光学機器
CN108254822B (zh) * 2016-12-28 2022-05-27 迪睿合株式会社 偏光板及其制造方法、以及光学设备
JP2018189980A (ja) * 2018-07-19 2018-11-29 デクセリアルズ株式会社 偏光板
CN110998384A (zh) * 2018-07-19 2020-04-10 迪睿合株式会社 偏振片
WO2020017455A1 (fr) * 2018-07-19 2020-01-23 デクセリアルズ株式会社 Polariseur
JP2021033049A (ja) * 2019-08-23 2021-03-01 デクセリアルズ株式会社 偏光板及び光学機器
JP7356291B2 (ja) 2019-08-23 2023-10-04 デクセリアルズ株式会社 偏光板及び光学機器
WO2021241439A1 (fr) * 2020-05-25 2021-12-02 デクセリアルズ株式会社 Plaque de polarisation, son procédé de fabrication et dispositif optique
JP7394020B2 (ja) 2020-05-25 2023-12-07 デクセリアルズ株式会社 偏光板及びその製造方法、ならびに光学機器

Also Published As

Publication number Publication date
JPWO2013046921A1 (ja) 2015-03-26

Similar Documents

Publication Publication Date Title
WO2013046921A1 (fr) Polariseur, élément optique polarisant, source lumineuse et dispositif d'affichage d'image
US7573546B2 (en) Wire grid polarizer having dual layer structure and method of fabricating the same
US7965035B2 (en) Light-emitting device, method for manufacturing light-emitting device, and image display apparatus
JP6023775B2 (ja) 表示モジュールおよび導光装置
JP5737284B2 (ja) 光学素子、光源装置、および投射型表示装置
JP5605426B2 (ja) 光学素子、光源装置及び投射型表示装置
JP2005077819A (ja) 偏光分離素子及びそれを用いた光学系、画像表示装置
JP2010210824A (ja) 光学素子及び照明装置
WO2012172858A1 (fr) Elément optique, appareil de source lumineuse et appareil d'affichage du type par projection
JP2004139001A (ja) 光学素子、光学変調素子、画像表示装置
JP2009223074A (ja) 偏光変換素子
JP4661038B2 (ja) 光源装置、光源装置の製造方法、投射型表示装置
WO2013132813A1 (fr) Élément optique, dispositif optique, et dispositif d'affichage
WO2013157211A1 (fr) Dispositif de projection
JP2008046609A (ja) 偏光回復プレート
JP5051830B2 (ja) 偏光照明装置および投射型画像表示装置
WO2014010200A1 (fr) Élément optique, dispositif optique et dispositif d'affichage
JP4537115B2 (ja) 偏光分離プリズム
JP2011077444A (ja) 光源装置、偏光変換素子及び表示装置
JP2011090036A (ja) 光学素子および光源装置
JP7439592B2 (ja) 波長変換素子、光源装置およびプロジェクター
WO2014013712A1 (fr) Dispositif optique et dispositif d'affichage l'utilisant
JP2007114375A (ja) 光照射装置および液晶表示装置および液晶投射装置
JP5741575B2 (ja) 波長板、発光素子、該発光素子を用いた画像表示装置
JP5188524B2 (ja) 偏光分離素子

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12834831

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2013536033

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12834831

Country of ref document: EP

Kind code of ref document: A1