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WO2008002541A2 - Diviseur de faisceau polarisant à grille de fils métalliques en forme de cube et affichage par projection comprenant ce dernier - Google Patents

Diviseur de faisceau polarisant à grille de fils métalliques en forme de cube et affichage par projection comprenant ce dernier Download PDF

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Publication number
WO2008002541A2
WO2008002541A2 PCT/US2007/014751 US2007014751W WO2008002541A2 WO 2008002541 A2 WO2008002541 A2 WO 2008002541A2 US 2007014751 W US2007014751 W US 2007014751W WO 2008002541 A2 WO2008002541 A2 WO 2008002541A2
Authority
WO
WIPO (PCT)
Prior art keywords
wire
cube
wires
prism
light beam
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/US2007/014751
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English (en)
Other versions
WO2008002541A3 (fr
Inventor
Bin Wang
Eric Gardner
Raymond Perkins
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Moxtek Inc
Original Assignee
Moxtek Inc
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
Priority claimed from US11/478,459 external-priority patent/US20070297052A1/en
Priority claimed from US11/475,857 external-priority patent/US20070296921A1/en
Application filed by Moxtek Inc filed Critical Moxtek Inc
Publication of WO2008002541A2 publication Critical patent/WO2008002541A2/fr
Publication of WO2008002541A3 publication Critical patent/WO2008002541A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3167—Modulator illumination systems for polarizing the light beam

Definitions

  • the present invention relates generally to a cube or prism wire-grid polarizer or polarizing beam splitter and an image projection system incorporating the same.
  • Visible light wire-grid polarizers and wire-grid polarizing beam splitters have been developed and successfully incorporated into rear projection monitors or televisions.
  • Such rear projection displays can use a spatial light modulator, such as a liquid crystal on silicon (LCOS) panel, to encode image information onto a polarized light beam.
  • the wire-grid polarizer or beam splitter can be used to produce the polarized light, and/or to separate the encoded image information from the beam produced by the spatial light modulator.
  • LCOS liquid crystal on silicon
  • One drawback of using a wire-grid polarizing beam splitter in a rear projection display can be an increase in back focal length of the display, an increase in the thickness of the display, and/or more costly projection lenses. It is believed that the use of the wire-grid polarizing beam splitter in air causes the increase in back focal length, etc. It is an ongoing challenge to develop rear projection displays with a reduced back focal length, a reduced thickness, and/or to reduce the cost of the projection lenses.
  • the invention provides a cube wire-grid polarizing beam splitter with a pair of prisms secured together to form a cube.
  • An array of parallel conductive wires is disposed between the pair of prisms.
  • a pair of continuous film layers is disposed on one side of the wires between the wires and a forward prism.
  • a forward film layer, adjacent the forward prism has a refractive index greater than both i) a refractive index of a rear film layer adjacent the wires, and ii) a refractive index of the forward prism.
  • a layer of ribs is disposed on another side of the wires between the wires and a rear prism. The ribs are aligned with and support the array of parallel conductive wires.
  • the invention provides a method of making a cube wire-grid polarizer device, comprising: a) forming an array of parallel conductive wires on a substrate, the wires having a size and a period to interact with light to substantially transmit light having one polarization orientation and substantially reflect light having another polarization orientation; b) etching into the substrate between the wires to form an array of troughs with an interlaced array of ribs upon which the wires are disposed; c) disposing a first continuous film layer in front of the array of wires; d) disposing a second continuous film layer in front of the first layer, the second layer having a refractive index greater than a refractive index of the first layer; e) securing the substrate to a first prism; and f) securing a second prism to the first to form a cube with the substrate between the first and second prisms.
  • the invention provides a display apparatus with a light source to produce a light beam.
  • At least one cube wire-grid polarizing beam splitter is disposable in the light beam to transmit a polarized light beam, and includes a plate wire-grid polarizer disposed between a pair of prisms secured together to form a cube.
  • At least one reflective spatial light modulator is disposable in the polarized light beam to encode image information thereon to produce an image bearing light beam.
  • the cube wire-grid polarizing beam splitter is disposable in the image bearing light beam to separate the image information and to produce a polarized image bearing light beam.
  • Projection optics are disposable in the polarized image bearing light beam.
  • a pair of continuous film layers is disposed between the plate wire-grid polarizer and a forward prism.
  • a forward layer adjacent the forward prism has a refractive index greater than both i) a refractive index of a rear layer adjacent the plate wire grid polarizer, and ii) a refractive index of the forward prism.
  • a layer of ribs is disposed between the wires and a rear prism, and the ribs are aligned with and supporting the wires.
  • the invention provides a modulation optical system with a reflective spatial light modulator configured to selectively encode image information on a polarized incident light beam to encode image information on a reflected beam.
  • a cube wire-grid polarizing beam splitter is disposed immediately adjacent the reflective spatial light modulator to provide the polarized incident light beam to the reflective spatial light modulator, and to separate the image information from the reflected beam.
  • the cube polarizing beam splitter includes a wire-grid polarizer disposed between a pair of prisms secured together to form a cube.
  • a pair of continuous film layers is disposed between the plate wire-grid polarizer and a forward prism.
  • a forward layer adjacent the forward prism has a refractive index greater than both i) a refractive index of a rear layer adjacent the wire- grid polarizer, and ii) a refractive index of the forward prism.
  • a layer of ribs extends from the substrate and is aligned with and supports the array of parallel conductive wires.
  • the invention provides a method of shortening a back focal length of a rear-projection display apparatus, comprising: a) obtaining a cube wire-grid polarizer with a wire-grid polarizer disposed between two prisms, a pair of continuous thin films between the wire-grid polarizer and a forward prism, with a forward film adjacent the forward prism having a refractive index greater than a refractive index of a rear film adjacent the wire-grid polarizer; b) disposing a reflective spatial light modulator adjacent the cube wire-grid polarizer, and orienting the cube wire-grid polarizer with the pair of continuous thin films between the reflective spatial light modulator and the wire-grid polarizer; d) disposing a recombination prism adjacent the cube wire-grid polarizer; e) disposing projection optics adjacent the recombination prism; and f) spacing the reflective spatial light modulator, the cube wire-grid polar polar
  • FIG. 1 is a side view of a cube wire-grid polarizing beam splitter in accordance with an embodiment of the present invention
  • FIG. 2 is a partial cross-sectional view of the cube beam splitter of FIG. 1;
  • FIG. 3 is a schematic side view of an example of the cube beam splitter of FIG. 1;
  • FIG. 4 is a schematic side view of a plate polarizer without prisms for comparison to the cube beam splitter of FlG. 3;
  • FIG. 5 is a partial cross-sectional view of another cube beam splitter in accordance with an embodiment of the present invention.
  • FIG. 6 is a schematic side view of an example of the cube beam splitter of FIG. 5;
  • FIG. 7 is a schematic view of a projection display system in accordance with an embodiment of the present invention.
  • FIG. 8 is a schematic view of a modulation optical system in accordance with an embodiment of the present invention.
  • FIG. 9 is a schematic view of a projection display system in accordance with an embodiment of the present invention.
  • FIG. 10 is a schematic view of a projection display system in accordance with an embodiment of the present invention.
  • FIG. 11 is a schematic view of another projection display system in accordance with an embodiment of the present invention.
  • FIG. 12 is a schematic view of another modulation optical system in accordance with an embodiment of the present invention.
  • polarizer and polarizing beam splitter are used interchangeably herein.
  • wire-grid polarizer (WGP) and wire-grid polarizing beam splitter (WGP PBS) are used interchangeably herein.
  • cube is used broadly herein to refer to a block that can be a cube with square sides and adjacent sides at right angles; substantially a cube or cube-shaped; or other block-like shape with sides and adjacent sides at other than right angles.
  • pris is used broadly herein to refer to a wedge that can be a wedge with parallel triangular ends with intermediate sides; substantially a prism or prism-shape; or other wedge-like shape.
  • wire-grid polarizers can provide enhanced performance or contrast to projection display systems, such as rear projection display systems.
  • cube polarizers might be used to reduce the back focal length, and reduce the cost of the projection lenses. It is believed that the projection systems with longer back focal lengths require more costly projection lenses. It is believed that the use of wire- grid polarizing beam splitters can increase the back focal length of the projection system, requiring more expensive projection lenses.
  • wire- grid polarizer and cube polarizer might be combined to achieve enhanced contrast, reduced back focal length, and less costly projection lenses. But it has also been recognized that the combination of the wire-grid polarizer and the cube can reduce the performance or contrast of the combination.
  • a cube wire-grid polarizer, or polarizing beam splitter, indicated generally at 10, is shown in an exemplary implementation in accordance with the present invention.
  • the cube polarizer 10 includes a plate wire-grid polarizer 14 disposed or sandwiched between a pair of prisms 18 and 22 secured together to form a cube.
  • the prisms 18 and 22 can be right triangles when viewed from the side, and can have a gap between them that is formed at a 45° angle with respect to the short sides of the triangle, and so that the long surfaces of the prisms oppose one another.
  • One prism can be a forward prism 18 and the other can be a rear prism 22.
  • the cube or front prism 18 can be disposed and oriented so that a light beam is incident on the forward prism 18.
  • the incident light can be oriented orthogonal to the cube, and thus a 45° angle with respect to the plate polarizer or wire-grid.
  • the incident light can be an unpolarized light beam to be polarized by the cube, or it can be an image bearing light beam with image information encoded thereon to be analyzed or separated by the cube.
  • the plate polarizer can "face" the forward prism, as described below.
  • the cube and/or plate polarizer can be used in a reflection mode, as described below.
  • the cube can have an image side and can be oriented to face an LCOS, as described below.
  • the cube can be oriented so that light is incident upon the rear prism, and so that the cube is used in a transmission mode.
  • the plate wire-grid polarizer 14 can include an array 30 of parallel conductive wires 34 disposed on or over, or carried by, a substrate 38.
  • the wires 34 are sized and spaced to interact with the light to substantially transmit light having one polarization orientation (p- polarization), and substantially reflect light having another orthogonal polarization orientation (s-polarization).
  • the period of the array can be less than the wavelength of visible light, or less than 0.2 ⁇ m (200 nm).
  • the length of the wires can be longer than the wavelength of visible light, or greater than 0.7 ⁇ m (700 nm).
  • the substrate can be BK7 glass (refractive index n «1.51-1.53), and the wires can be aluminum (AL) formed on the substrate by lithographic techniques, as is known in the art.
  • the bottom surface of the substrate (opposite the wires) can be secured to the surface of the rear prism 22, such as with a suitable adhesive selected to reduce interference with the light.
  • wire- grid polarizers are described in U.S. Patent Nos. 6,208,463; 6,081,376; 6,288,840; 6,243,199; 6,122,103; 6,785,050; 6,532,111; 6,714,350; 6,844,971 ; 6,665,119; and 6,788,461; which are herein incorporated by reference.
  • the wires 34 can define a front of the wire-grid polarizer 14 configured to face towards incident light for use in a reflection mode. While the wire-grid polarizer, and the cube, can be used in either reflection or transmission mode, i.e. with the light incident on wires or the substrate (or both), it has been found that orienting the wire-grid polarizer to face the incident light (particularly an image bearing light) in combination with the other aspects described herein produce improved results.
  • the cube can also have opposite layers disposed on either side of the wires, between the wires and the prisms, configured to distort the light, and thus counteract the distortion introduced by the use of the prisms and the wire-grid polarizer together.
  • a pair 42 of continuous film layers such as a forward or intermediate film layer 46 and a rear film layer 50, can be disposed between the wire-grid polarizer 14 and the forward prism 18.
  • the forward film layer 46 can be disposed adjacent or against the forward prism 18 while the rear film layer 50 can be disposed adjacent or against the wires 34.
  • the forward or intermediate film layer 46 can be sandwiched between the forward prism 18 and the rear film layer 50.
  • the pair 42 of film layers can fill the entire space between the wires 34 and the forward prism 18, so that there are only two layers. Alternatively, other film layers can be added so that there are more than two.
  • the forward or intermediate film layer 46 can have a refractive index (n f ) greater than both 1) a refractive index (n r ) of the rear film layer 50, and 2) a refractive index (n p ) of the forward prism 18.
  • n f refractive index
  • the prism 18 can be BK7 glass (n p ⁇ 1.51-1.53).
  • the refractive index n f of the front film layer 46 can be greater than 1.53.
  • the front film layer 46 can be titanium dioxide with a refractive index of approximately n f ⁇ 2.3.
  • the rear film layer 50 can be silicon dioxide with a refractive index of n r of approximately 1.45.
  • the front film layer 46 can be titanium dioxide with a refractive index of approximately n f ⁇ 2.25.
  • the rear film layer 50 can be spin-on glass with a refractive index of approximately n r ⁇ 1.17.
  • another layer 54 can be disposed between the wires 34 and the opposite or rear prism 22.
  • An array 58 of ribs 62 can extend from the substrate 38 and support the wires 34.
  • the array 58 of ribs 62 and the array 30 of wires 34 can be aligned.
  • An array of troughs can be interlaced between the array of ribs, and thus between the wires.
  • the ribs 62 can be the same material as the substrate 38, and can be formed by etching the substrate between the wires.
  • the ribs can be BK7 glass or a dielectric material.
  • the substrate also is BK7 glass.
  • the plate wire-grid polarizer includes aluminum (AL) wires and air gaps (refractive index of 1).
  • the pitch or period of the wires is 120 nm.
  • S The plate wire-grid polarizer was made by a lithography process to form the wires on the substrate.
  • the substrate was etched between the wires to form troughs between the wires, and ribs between the troughs upon which the wires were disposed.
  • the rear film layer was deposited over the wires, and the front film layer was deposited over the rear film layer.
  • FIG.4 shows a similar plate wire-grid polarizer without the cube or prisms.
  • the calculated performance of the cube wire-grid polarizer is shown in Table 1, compared to the plate wire-grid polarizer without the cube, and the plate wire-grid polarizer without the cube, film layers and ribs.
  • the cube wire-grid polarizer has better reflection efficiency (Rs) than the plate polarizer by itself, and with only the ribs and film layers (but without the cube).
  • the cube polarizer 10b or plate wire-grid polarizer 14b has gaps filled with a material, such as the same material as the rear film layer 50b.
  • the front film layer 46b can be titanium dioxide with a refractive index of np ⁇ 2.25.
  • the gaps can have a refractive index the same as that of the rear film layer.
  • Example 2 Referring to FIG. 6, a second non-limiting example of a cube wire-grid polarizer is shown.
  • the substrate also is BK7 glass.
  • the plate wire-grid polarizer includes aluminum (AL) wires.
  • the pitch of the wires is 120 nm.
  • the material of the rear film layer fills the gaps between the wires.
  • the plate wire-grid polarizer was made by a lithography process to form the wires on the substrate.
  • the substrate was etched between the wires to form troughs between the wires, and ribs between the troughs upon which the wires were disposed.
  • the rear film layer was deposited over the wires, and the front film layer was deposited over the rear film layer.
  • Table 2 The calculated performance of the cube wire-grid polarizer is shown in Table 2, compared to the cube polarizer of FIG. 3.
  • the cube wire-grid polarizer with filled gaps may have better overall efficiency, better reflection efficiency (Rs) and better reflection contrast (Cr) than the cube wire-grid polarizer with the air gaps, based on the exemplary configurations shown.
  • the system 100 includes a light source 104 to produce a light beam.
  • the beam can be treated by various optics, including beam shaping optics, recycling optics, polarizing optics, etc. (Various aspects of using a wire-grid polarizer in light recycling are shown in U.S. Patent Nos. 6,108,131 and 6,208,463; which are herein incorporated by reference.)
  • One or more color separator(s) 108 such as dichroic filters, can be disposable in the light beam to separate the light beam into color light beams, such as red, green and blue.
  • At least one cube wire-grid polarizing beam splitter 10 can be disposable in one of the color light beams to transmit a polarized color light beam.
  • the cube beam splitter 10 can include a plate wire-grid polarizer disposed between a pair of prisms secured together to form a cube.
  • At least one reflective spatial light modulator 1 12, such as an LCOS panel, can be disposable in the polarized color light beam to encode image information thereon to produce an image bearing color light beam.
  • the cube wire-grid polarizing beam splitter 10 can be disposable in the image bearing color light beam to separate the image information and to reflect a polarized image bearing color light beam.
  • three cube polarizers 10 and three spatial light modulators 112 can be used, one for each color of light (blue, green, red).
  • the polarized image bearing color light beams can be combined with an polarized image bearing color light beams.
  • Projection optics 120 can be disposable in the polarized image bearing color light beam to project the image on a screen 124.
  • the cube polarizer 10 can have a pair of continuous film layers disposed between the plate wire-grid polarizer and one of the pair of prisms with a layer adjacent the prism having a refractive index greater than both i) a refractive index of a layer adjacent the plate wire grid polarizer, and ii) a refractive index of an adjacent prism; and a layer of ribs extending from the substrate and aligned with and supporting the array of parallel conductive wires.
  • the cube polarizer 10 can face, or can have an image side that faces, the spatial light modulator 1 12. The facing or image side is opposite the substrate on which the wire-grid is disposed, or is the side with the film layers.
  • the back focal length is the optical path distance between the spatial light modulator, or LCOS panel, and the projection lens. It is difficult to arbitrarily shortened this distance in an actual projection system because the spatial light modulator and other components must all fit within the physical space allowed by the desired back focal length.
  • the optical path distance can be decoupled from the physical distance by the use of materials with a higher optical index. Therefore, ' using the cube polarizer described above allows the back focal length to be shortened for a given physical space required in order to fit the required components together. This is accomplished while also compensating for, or improving, the performance of the cube polarizer due to the prisms on both sides of the wire-grid:
  • the spatial light modulator 112, or LCOS can disposed immediately adjacent the cube wire-grid polarizing beam splitter 10, thus reducing the back focal length.
  • One or more polarization compensators may be disposed between the LCOS and the cube.
  • a combining prism 116, or x-cube can be disposed between the cube wire-grid polarizing beam splitter 10 and the projection optics 120.
  • the combining prism 116 can be disposed adjacent the cube polarizer 10, but a clean-up or post polarizer can be disposed therebetween.
  • the cube polarizer 10 used in the projection display 100 can result in a back focal length less than approximately 3 inches defined by a distance between the spatial light modulator and the projection optics that is less than approximately 3 inches. In another aspect, the back focal length can be less than approximately 2 inches.
  • the light source can include an LED array.
  • the LED array can be disposed adjacent the cube wire-grid polarizing beam splitter opposite the spatial light modulator or LCOS.
  • the LED array can include groupings of individual colored LEDs, such as red, green and blue.
  • the LED array or colored LEDs can be modulated to produce colored light. For example, the LED array can provide sequential pulses of colored light.
  • the spatial light modulator can be modulated along with the LED array to correspond to the pulses of colored light.
  • the light and image can be provided on a single channel, with a single light source, a single spatial light modulator, and a single cube beam splitter.
  • the cube polarizer 10 described above can be used in a subsystem of the projection display, such as a light engine or a modulation optical system 150, which includes the spatial light modulator 112 and cube polarizer 10.
  • a modulation optical system may also include a light source, color separators, beam shaping optics, light recycler, pre-polarizers, post-polarizers, compensators, and/or an x-cube.
  • One or more modulation optical systems can be combined with other optics and components in a projection system .
  • the reflective spatial light modulator 112 can be configured to selectively encode image information on a polarized incident light beam to encode image information on a reflected beam.
  • the cube wire-grid polarizing beam splitter 10 can be disposed immediately adjacent the reflective spatial light modulator to provide the polarized incident light beam to the reflective spatial light modulator, and to separate the image information from the reflected beam.
  • the cube polarizer can include a plate wire-grid polarizer disposed between a pair of prisms secured together to form a cube.
  • a pair of continuous film layers can be disposed between the plate wire-grid polarizer and one of the pair of prisms with a layer adjacent the prism having a refractive index greater than both i) a refractive index of a layer adjacent the plate wire-grid polarizer, and ii) a refractive index of an adjacent prism.
  • a layer of ribs can extend from the substrate and can be aligned with and support the array of parallel conductive wires.
  • a display system 160 or 164 can have a single channel, as shown in FIGs. 9 and 10.
  • the cube beam splitter has been described above as being used with a reflective spatial light modulator, such as an LCOS panel, it will be appreciated that the cube beam splitter can be used with a transmissive spatial light modulator 168, as shown in FIG. 10. In the configuration shown in FIG. 10, the cube may not need the rear prism.
  • a projection system and modulation optical system were shown in FIGs.
  • a method of shortening a back focal length of a rear-projection display apparatus includes (without regard to order) 1) obtaining a cube wire-grid polarizer with a wire-grid polarizer disposed between two prisms, a pair of continuous thin films between the wire-grid polarizer and a forward prism, with a forward film adjacent the forward prism having a refractive index greater than a refractive index of a rear film adjacent the wire-grid polarizer; 2) disposing a reflective spatial light modulator adjacent the cube wire-grid polarizer, and orienting the cube wire-grid polarizer with the pair of continuous thin films between the reflective spatial light modulator and the wire-grid polarizer; 3) disposing a recombination prism adjacent the cube
  • a method of making a cube wire-grid polarizer device includes (without regard to order) 1) forming an array of parallel conductive wires on a substrate, the wires having a size and a period to interact with light to substantially transmit light having one polarization orientation and substantially reflect light having another polarization orientation; 2) etching into the substrate between the wires to form an array of troughs with an interlaced array of ribs upon which the wires are disposed; 3) disposing a first continuous film layer in front of the array of wires; 4) disposing a second continuous film layer in front of the first layer, the second layer having a refractive index greater than a refractive index of the first layer; 5) securing the substrate to a first prism; and 6) securing a second prism to the first to form a cube with the substrate between the first and second prisms.
  • Disposing the first continuous film layer can include depositing a material onto the wires.
  • the second layer can be disposed over the first.
  • disposing the second continuous film layer can include deposition a material onto the second prism.
  • the substrate can be secured to the prism by a suitable adhesive.
  • the second layer can be secured to the other prism with a suitable adhesive.
  • the prisms, plate polarizer and layers can be secured together without adhesive, such as being mechanically held in place, such as with a fixture or clip.
  • Various aspects of projection display systems with wire-grid polarizers or wire-grid polarizing beam splitters are shown in U.S. Patent Nos.
  • a projection system can be of any type, including a front projection system.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Polarising Elements (AREA)
  • Projection Apparatus (AREA)

Abstract

Un diviseur de faisceau polarisant (10, 10b) à grille de fils métalliques en forme de cube comprend une paire de prismes (18, 22) fixés ensemble pour former un cube. Un réseau (30) de fils métalliques conducteurs parallèles (34) est placé entre la paire de prismes. Une paire de couches pelliculaires continues (42) est disposée sur un côté des fils métalliques entre les fils métalliques et un des deux prismes avec une couche pelliculaire intermédiaire (46, 46b) adjacente au prisme ayant un indice de réfraction supérieur à la fois à (i) un indice de réfraction d'une couche pelliculaire arrière (50, 50b) adjacente à au polariseur à grille de fils métalliques à plaque et à (ii) un indice de réfraction d'un prisme adjacent. Une couche de nervures (62) est disposée sur un autre côté des fils métalliques entre les fils métalliques et un autre prisme faisant partie de la paire de prismes, les nervures étant alignées sur le réseau de fils métalliques conducteurs parallèles et supportant ledit réseau. Un appareil d'affichage (100) comprend un diviseur de faisceau polarisant à grille de fils métalliques en forme de cube.
PCT/US2007/014751 2006-06-26 2007-06-25 Diviseur de faisceau polarisant à grille de fils métalliques en forme de cube et affichage par projection comprenant ce dernier Ceased WO2008002541A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US11/478,459 2006-06-26
US11/475,857 2006-06-26
US11/478,459 US20070297052A1 (en) 2006-06-26 2006-06-26 Cube wire-grid polarizing beam splitter
US11/475,857 US20070296921A1 (en) 2006-06-26 2006-06-26 Projection display with a cube wire-grid polarizing beam splitter

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WO2008002541A2 true WO2008002541A2 (fr) 2008-01-03
WO2008002541A3 WO2008002541A3 (fr) 2008-05-02

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US7261418B2 (en) * 2004-11-12 2007-08-28 3M Innovative Properties Company Projection apparatus

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US9535256B2 (en) 2011-11-28 2017-01-03 3M Innovative Properties Company Polarizing beam splitters providing high resolution images and systems utilizing such beam splitters
US10345610B2 (en) 2011-11-28 2019-07-09 3M Innovative Properties Company Polarizing beam splitters providing high resolution images and systems utilizing such beam splitters
US10591742B2 (en) 2011-11-28 2020-03-17 3M Innovative Properties Company Polarizing beam splitters providing high resolution images and systems utilizing such beam splitters
US10712578B2 (en) 2011-11-28 2020-07-14 3M Innovative Properties Company Polarizing beam splitters providing high resolution images and systems utilizing such beam splitters

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