US20070047078A1 - Polarization recovery system for projection displays - Google Patents
Polarization recovery system for projection displays Download PDFInfo
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- US20070047078A1 US20070047078A1 US11/590,721 US59072106A US2007047078A1 US 20070047078 A1 US20070047078 A1 US 20070047078A1 US 59072106 A US59072106 A US 59072106A US 2007047078 A1 US2007047078 A1 US 2007047078A1
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- 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
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- 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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
- G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
- G02B27/1026—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources for use with reflective spatial light modulators
- G02B27/1033—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources for use with reflective spatial light modulators having a single light modulator for all colour channels
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/14—Beam splitting or combining systems operating by reflection only
- G02B27/145—Beam splitting or combining systems operating by reflection only having sequential partially reflecting surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/14—Beam splitting or combining systems operating by reflection only
- G02B27/149—Beam splitting or combining systems operating by reflection only using crossed beamsplitting surfaces, e.g. cross-dichroic cubes or X-cubes
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
- G02B27/285—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining comprising arrays of elements, e.g. microprisms
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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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
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4298—Coupling light guides with opto-electronic elements coupling with non-coherent light sources and/or radiation detectors, e.g. lamps, incandescent bulbs, scintillation chambers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
- H04N5/7416—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
- H04N5/7441—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal the modulator being an array of liquid crystal cells
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- 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]
- H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
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- 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
- H04N9/3152—Modulator illumination systems for shaping the light beam
Definitions
- the present invention relates an improved system and methodology for substantially increasing the light output of a polarized optical projection system through the recovery of optical energy of an unused polarization.
- a liquid crystal display (hereafter “LCD”) is a known device used to control the transmission of polarized light energy.
- the LCD may be either clear or opaque, depending on the current applied to the LCD.
- projection systems commonly use an array containing numerous LCDs to form an image source.
- the projection system inputs high intensity, polarized light energy to the LCD array (also called an imager), which selectively transmits some of the inputted light energy to form a projection of a desired image. Because a single LCD is relatively small, numerous LCDs can be packed together into the array, thereby forming an imager that can produce a high resolution image.
- a projection system must first polarize the light input to the LCD.
- light energy from a light source such as a bulb
- the LCD projector since this light input to the LCD imager must be in one orientation (i.e., either p-polarization or s-polarization), the LCD projector generally uses only half of the light energy from the light source.
- various methodologies have been developed to capture the light energy of unusable polarization, to convert the polarization of this captured light energy, and then to redirect the converted light energy toward the LCD imager.
- the present invention uses a waveguide system to perform the polarization recovery function in an LCD projection system.
- the present invention's waveguide polarization recovery system both polarizes the input light energy for use with an LCD imager and converts the polarity of unusable light energy to add to the illumination of the LCD imager.
- the compact polarization recovery waveguide system generally includes the following optical components that are integrated into a single unit: (1) an input waveguide that inputs non-polarized light energy into the system; (2) an output waveguide that removes polarized light energy from the system; (3) a polarized beam splitter that receives the light energy from the input waveguide and transmits light energy of a first polarization type and reflects light energy of a second polarization type, and (4) a wave plate that modifies the polarization of either the transmitted or reflected light energy.
- the polarization recovery system also generally includes one or more mirrors that are positioned as needed to direct the transmitted and/or reflected light energy to the output waveguide.
- the input and output waveguides may be shaped as needed by the projection system. For example, either one or both of the input and output waveguides may be tapered as needed to produce a desired image.
- the input and output waveguides are configured to have either a substantially parallel or a substantially perpendicular orientation.
- the output waveguide directly receives light energy transmitted by the beam splitter. In this way, light energy enters and exits the polarization recovery system in substantially the same direction.
- the input and the output waveguides may be positioned substantially perpendicular to each other such that the light energy exits the polarization recovery system at a right angle from the direction it enters.
- a mirror receives the light energy transmitted by the polarized beam splitter and redirects this energy by 90° toward the output waveguide.
- the polarization recovery waveguide system of the present invention combines the above-enumerated list of optical components into a single, compact unit.
- the waveguide polarization recovery system further includes one or more “gaps” of optically clear material positioned between the optical components to encourage the occurrence of total internal reflection that minimizes the loss of the optical energy by the system.
- FIGS. 1-4 and 6 - 10 are schematic diagrams that illustrate various embodiments of the waveguide polarization recovery system of the present invention.
- FIG. 5 is a schematic diagram that illustrates a compact projection device that uses one embodiment of the polarization recovery system of the present invention.
- the present invention is a compact waveguide polarization recovery system 10 having an input waveguide 20 , a polarizing beam splitter (“PBS”) 30 , a wave plate 40 , which can be a half-wave plate, or a quarter-wave plate depending on the configuration, and an output waveguide 50 .
- the waveguide polarization recovery system 10 generally further includes mirrors 60 as needed to direct the light stream between the input and output waveguides, 20 and 50 .
- the following discussion first summarizes several possible configurations for the waveguide polarization recovery system 10 and then describes the individual elements in greater detail.
- FIGS. 1, 3 , and 6 illustrate one configuration of the waveguide polarization recovery system 10 in which the output light energy is substantially parallel with the input light energy.
- the input waveguide 20 introduces unpolarized input light at incidence to the PBS 30 .
- the illustrated PBS 30 transmits p-polarized light, and so the p-polarized portion of the input light energy continues through in the same direction as the initial input while the s-polarized light is reflected in a perpendicular direction to the initial direction of input.
- the half-wave plate 40 is positioned to receive the reflected s-polarized light and convert it to p-polarized. Subsequently, mirror 60 redirects the converted energy from the half-wave plate 40 back to the initial direction of input.
- Both the transmitted light energy from the PBS 30 and the converted light energy from the half-wave plate 40 are recombined in the output waveguide and mixed.
- the output light energy has a uniform intensity profile and is polarized. It should be appreciated that an output of the opposite polarization may be produced through the use of a PBS 30 that only transmits s-polarized light.
- FIGS. 2, 4 , and 7 - 8 illustrate another embodiment of the waveguide polarization recovery system 10 that has an alternative configuration in which the output light energy is perpendicular to the original input light energy.
- the input waveguide 20 introduces unpolarized input light at incidence to the PBS 30 .
- the PBS 30 performs the same function of transmitting the p-polarized light, and so the p-polarized portion of the input light energy continues through in the same direction as the initial input while the s-polarized light is reflected in a perpendicular direction to the initial direction of input.
- one mirror 60 redirects the transmitted p-polarized portion of the input light energy by 90° toward the output waveguide 50 .
- the reflected s-polarized light from the PBS 30 propagates once through a quarter-wave plate 40 ′, and a second mirror 60 then returns the reflected light energy to the quarter-wave plate 40 ′ for another pass.
- the second pass is also in the direction of the output waveguide 50 . Because the reflected s-polarized light passes twice through the quarter-wave plate 40 ′, s-polarized light is shifted by a half-wave to become p-polarized twice with the mirror as shown. Again, both p-polarized outputs will be mixed in the output waveguide, producing a uniform intensity output.
- the system requires only two optical sections: A first section formed through the combination of the input waveguide 20 , the PBS 30 , the quarter-wave plate 40 ′ and a mirror 60 ; and a second section formed through the combination of the output waveguide 50 and a second mirror 60 . Therefore, the system has a simple design and a relatively low cost. Positioning the output light energy perpendicular to the original input light energy also has the advantage of allowing a more compact projection system, as described in greater detail below.
- FIGS. 9 and 10 illustrate configurations in which the half-wave plate 40 is positioned to receive light energy transmitted by the PBS 30 .
- the half-wave plate 40 is optically positioned between a mirror 60 and the output waveguide 50 .
- the half-wave plate 40 receives transmitted light energy that has first been redirected by a mirror 60 .
- the half-wave plate 40 is placed between the PBS 30 and mirror 60 .
- FIGS. 9-10 are advantageous because the input light energy only passes through the polarization layer of the PBS 30 once, thus reducing the loss of optical energy in the system 10 .
- the above-described configuration of the FIGS. 2, 4 , and 7 - 8 requires some of the input light energy to pass through the PBS 30 twice.
- the input waveguide 20 is typically an integrator that collects the light from a light source, such as an arc lamp, and mixes the light through multiple reflections to produce a more uniform intensity profile into the waveguide polarization recovery system 10 .
- the output waveguide 50 is typically an integrator that collects the light from the waveguide polarization recovery system 10 and mixes the light through multiple reflections to produce a more uniform intensity profile for illumination of the imager.
- the input waveguide 20 and the output waveguide 50 may be, for example, single core optic fibers, fused bundles of optic fibers, fiber bundles, solid or hollow square or rectangular light pipes, or homogenizers, which can be tapered or un-tapered.
- the input waveguide 20 and the output waveguide 50 are typically rectangular in cross-section to correspond with the shape of the imager and the final projected image.
- the input waveguide 20 and the output waveguide 50 wave can be made from glass, quartz, or plastic depending on the power-handling requirement.
- Either one or both of the input waveguide 20 and the output waveguide 50 can have an increasing or decreasing taper as needed for the projection system.
- FIG. 3-4 and 6 - 10 illustrate embodiments of the waveguide polarization recovery system 10 in which the input waveguide 20 ′ is a tapered rod with the input cross-section matched to the area of the light source and the output cross-section related to the dimensions of a LCD imager. The final dimensions for the input waveguide 20 may vary as needed to minimize stray light loss in the optical projection system.
- FIG. 8 illustrates an embodiment of the waveguide polarization recovery system 10 in which the output waveguide 50 ′ is also tapered.
- Tapering of the output waveguide 50 ′ is advantageous because, depending on the performance parameters of the PBS 30 , the wave plate 40 , and the output requirements for the projection system, polarization recovery may not always be done at the same numerical aperture as the output aperture.
- the performances of the PBS 30 and the wave plate 40 are better at smaller numerical apertures, and as a result, advantageous increases in performance are achieved by transforming the input light energy into a larger area with a small numerical aperture and then transforming the light energy back into larger numerical apertures at the output of the output waveguide 50 ′.
- the tapering of the input wave guide 20 and the output waveguide 50 can be selected to match the overall performance requirements of the projection system, and similarly, the input and output waveguides can be tapered in either direction.
- the waveguide polarization recovery system 10 further includes PBS 30 .
- the PBS 30 is a well-known optical element that transmits light energy of one polarization while reflecting light energy of a different polarization.
- the PBS 30 is a rectangular prism of optically clear material, such as plastic or glass, that has a polarizing coating applied to the diagonal surface.
- the PBS 30 may be composed of a material that selectively transmit light energy depending on the polarization of the light energy.
- any of these alternative PBS's may be employed in the waveguide polarization recovery system 10 of the present invention. Because the PBS 30 is a well known and commercially available item, it is not discussed further.
- the wave plate 40 is an optically transparent component that modifies the polarization of light energy that passes through the wave plate 40 .
- the wave plate 40 typically changes the propagating of light in one oaxis, thus changes the polarization.
- the wave plate 40 may be either a half-wave or quarter-wave as needed by the specific configuration of the waveguide polarization recovery system 10 . Overall, the wave plate 40 is a well known and commonly available item and will not be discussed further.
- the waveguide polarization recovery system 10 may further include one or more mirrors 60 as needed to direct the light energy through the waveguide polarization recovery system 10 .
- mirrors are commonly known to be metal-coated glass surfaces or polished metal, the mirrors 60 should not be limited to this common definition for the purpose of this invention. Instead, mirrors 60 should be considered any optical component capable of reflecting or redirecting light energy.
- mirrors 60 may be prisms that use the angle of incidence to capture and redirect light energy.
- FIGS. 9 and 10 illustrate a waveguide polarization recovery system 10 that has a prism to redirect light energy transmitted by the PBS 30 toward the output waveguide 50 . For systems with small numerical apertures, total internal reflection at the prism can be used, and as a result, the coating is not necessary.
- the waveguide polarization recovery system 10 further includes one or more optically clear areas, or “gaps,” 70 between the other optical elements.
- the gaps 70 may be pockets of air left between the optical components.
- the gap 70 can also be filled with low index epoxy or other transparent material such that the total internal reflection still occurs, but the assembly of the components will be simplified.
- FIG. 6 illustrates a configuration having gap 70 between the input waveguide 20 and the PBS 30 .
- FIG. 6 illustrates a waveguide polarization recovery system 10 in which gaps 70 have been added to a polarization recovery system with a tapered input waveguide 20 and perpendicularly configured output waveguide 50 illustrated in FIG. 4 . Again these gaps 70 increase the efficiency by encouraging total internal reflection between the optical components. As illustrated in FIGS. 6-7 , the gaps 70 , while increasing the efficiency of the system, cause the waveguide polarization recovery system 10 to become more complex with an increased number of discrete parts.
- the gaps 70 further serve the purpose of improving the performance of the prism 60 ′ that serves as a mirror to direct the light energy toward the output waveguide 50 .
- the gap 70 is needed between the PBS 30 and the prism 60 ′ such that the light reflected from the hypotenuse of the prism 60 ′, back toward the PBS 30 , hits this interface of the gap 70 and is internally reflected toward the output waveguide 50 . In this way, efficiency of the system is improved by minimizing loss.
- the performance advantages of the gaps 70 may be further increased through the use of anti-reflection coating on both surfaces such that the transmitted light suffers minimal loss.
- FIG. 5 illustrates a projector 100 that employs the waveguide polarization recovery system 10 .
- the projector 100 consists of a light collecting system 110 , which in this illustrated example has two paraboloid reflectors and a retro-reflector that increase the output by reflecting the light from a light source 120 back into itself.
- the arc of the light source 120 is placed at a focus of the first paraboloid reflector and the proximal end of the input waveguide 20 is at the focus of the second paraboloid reflector.
- this light collection system 110 is provided merely for illustration, and many other light collection systems are known and may be used.
- the light source 120 may be an arc lamp, such as xenon, metal-halide lamp, HID, or mercury lamps, or a filament lamp, such as a halogen lamp, provided that the system is modified to accommodate the non-opaque filaments of the lamp.
- arc lamp such as xenon, metal-halide lamp, HID, or mercury lamps
- filament lamp such as a halogen lamp
- the input waveguide 20 is a tapered light pipe that is designed to match the light input collected from the light collecting system 110 to the optical needs of an LCD imager 150 .
- the light output of the input waveguide 20 is polarized by the PBS 30 and the other polarization is recovered by the quarter-wave plate 40 ′.
- the output waveguide 50 then directs the polarized optical energy toward the LCD imager 150 .
- the light output in the output waveguide 50 is then incident into a second PBS 130 whose orientation is matched to the polarization of the incident light to minimize the loss.
- a color wheel 140 or other type of color selection system, and the reflective LCD imager 150 create the projected image by the projection lenses 160 in a traditional manner. As shown in FIG. 5 , the number of optical elements is minimal and, as the result, the cost for the projector is relatively low.
- the waveguide polarization recovery system 10 may be used in other types of projection systems.
- the projector may also use two or three imagers 150 to define the projected image.
- the imager 150 may also be a reflective display using liquid crystal on silicon (“LCOS”) technology, or any other type of systems that requires polarized light.
- the color wheel 140 can also be replaced by electrically switchable color system without moving parts or other known color projection systems.
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Abstract
A waveguide polarization recovery system both polarizes the input light energy for use with an LCD imager and converts the polarity of unusable light energy to add to the illumination of the LCD imager. The compact polarization recovery waveguide system generally includes: (1) an input waveguide that provides non-polarized light energy into the system; (2) an output waveguide that receives polarized light energy from the system; (3) a polarized beam splitter that received the light energy from the input waveguide and transmits lights energy of a first polarization type and reflects light energy of a second polarization type, and (4) a wave plate that modifies the polarization of either the transmitted or reflected light energy. The polarization recovery system also generally includes one or more mirrors that are positioned as need to direct the transmitted and the reflected light energy to the output waveguide. The input and output waveguides may be shaped as needed by the projection system. For example, either one or both of the input and output waveguides may be tapered as needed to produce a desired image. In the waveguide polarization recovery system, the input and output waveguides are configured to have either an either a substantially parallel or a substantially perpendicular orientation. In another embodiment, the waveguide polarization recovery system further includes has one or more “gaps” of optically clear material positioned between the optical components to encourage the occurrence of total internal reflection that minimizes the loss of the optical energy by the system.
Description
- The present application is a continuation of application Ser. No. 09/814,970, filed Mar. 23, 2001, which claims benefit of U.S. Provisional Application Nos. 60/227,312, filed Aug. 24, 2000 and 60/246,583, filed Nov. 8, 2000.
- The present invention relates an improved system and methodology for substantially increasing the light output of a polarized optical projection system through the recovery of optical energy of an unused polarization.
- A liquid crystal display (hereafter “LCD”) is a known device used to control the transmission of polarized light energy. The LCD may be either clear or opaque, depending on the current applied to the LCD. Because of this functionality, projection systems commonly use an array containing numerous LCDs to form an image source. In particular, the projection system inputs high intensity, polarized light energy to the LCD array (also called an imager), which selectively transmits some of the inputted light energy to form a projection of a desired image. Because a single LCD is relatively small, numerous LCDs can be packed together into the array, thereby forming an imager that can produce a high resolution image.
- As suggested above, a projection system must first polarize the light input to the LCD. However, light energy from a light source, such as a bulb, may have either p-polarization or s-polarization. Since this light input to the LCD imager must be in one orientation (i.e., either p-polarization or s-polarization), the LCD projector generally uses only half of the light energy from the light source. However, it is desirable in projection systems to maximize the brightness and intensity of the light output. In response, various methodologies have been developed to capture the light energy of unusable polarization, to convert the polarization of this captured light energy, and then to redirect the converted light energy toward the LCD imager. These known polarization recovery methodologies involve creating an expanded beam of light in which the unused portion of the light (of undesired polarity) is sent through a half-wave plate to change the polarization and then recombined with the original polarized beam. Unfortunately, the implementation of these known methodologies requires complex, bulky systems, which usually include 2-dimensional lense arrays and an array of polarization beam splitters. Furthermore, the known methodologies lose much of the light energy and, therefore, compromise the projector's goal of producing a high intensity output. As a result, there exists a current need for a simple, low cost, and compact polarization recovery system that operates with high efficiency.
- In response to these needs, the present invention uses a waveguide system to perform the polarization recovery function in an LCD projection system. In particular, the present invention's waveguide polarization recovery system both polarizes the input light energy for use with an LCD imager and converts the polarity of unusable light energy to add to the illumination of the LCD imager. The compact polarization recovery waveguide system generally includes the following optical components that are integrated into a single unit: (1) an input waveguide that inputs non-polarized light energy into the system; (2) an output waveguide that removes polarized light energy from the system; (3) a polarized beam splitter that receives the light energy from the input waveguide and transmits light energy of a first polarization type and reflects light energy of a second polarization type, and (4) a wave plate that modifies the polarization of either the transmitted or reflected light energy. The polarization recovery system also generally includes one or more mirrors that are positioned as needed to direct the transmitted and/or reflected light energy to the output waveguide. The input and output waveguides may be shaped as needed by the projection system. For example, either one or both of the input and output waveguides may be tapered as needed to produce a desired image.
- In the waveguide polarization recovery system, the input and output waveguides are configured to have either a substantially parallel or a substantially perpendicular orientation. In configurations in which the input and output waveguides are substantially parallel, the output waveguide directly receives light energy transmitted by the beam splitter. In this way, light energy enters and exits the polarization recovery system in substantially the same direction. Alternatively, the input and the output waveguides may be positioned substantially perpendicular to each other such that the light energy exits the polarization recovery system at a right angle from the direction it enters. In configurations having input and output waveguides of perpendicular orientation, a mirror receives the light energy transmitted by the polarized beam splitter and redirects this energy by 90° toward the output waveguide.
- The polarization recovery waveguide system of the present invention combines the above-enumerated list of optical components into a single, compact unit. In one embodiment, the waveguide polarization recovery system further includes one or more “gaps” of optically clear material positioned between the optical components to encourage the occurrence of total internal reflection that minimizes the loss of the optical energy by the system.
- These and other advantages of the present invention will be described in detail with reference to the following drawings in which like reference numbers refer to like elements:
-
FIGS. 1-4 and 6-10 are schematic diagrams that illustrate various embodiments of the waveguide polarization recovery system of the present invention; and -
FIG. 5 is a schematic diagram that illustrates a compact projection device that uses one embodiment of the polarization recovery system of the present invention. - As illustrated in
FIGS. 1-4 and 6-10, the present invention is a compact waveguidepolarization recovery system 10 having aninput waveguide 20, a polarizing beam splitter (“PBS”) 30, awave plate 40, which can be a half-wave plate, or a quarter-wave plate depending on the configuration, and anoutput waveguide 50. The waveguidepolarization recovery system 10 generally further includesmirrors 60 as needed to direct the light stream between the input and output waveguides, 20 and 50. The following discussion first summarizes several possible configurations for the waveguidepolarization recovery system 10 and then describes the individual elements in greater detail. -
FIGS. 1, 3 , and 6 illustrate one configuration of the waveguidepolarization recovery system 10 in which the output light energy is substantially parallel with the input light energy. In this embodiment, theinput waveguide 20 introduces unpolarized input light at incidence to thePBS 30. The illustratedPBS 30 transmits p-polarized light, and so the p-polarized portion of the input light energy continues through in the same direction as the initial input while the s-polarized light is reflected in a perpendicular direction to the initial direction of input. The half-wave plate 40 is positioned to receive the reflected s-polarized light and convert it to p-polarized. Subsequently,mirror 60 redirects the converted energy from the half-wave plate 40 back to the initial direction of input. Both the transmitted light energy from thePBS 30 and the converted light energy from the half-wave plate 40 are recombined in the output waveguide and mixed. As a result, the output light energy has a uniform intensity profile and is polarized. It should be appreciated that an output of the opposite polarization may be produced through the use of aPBS 30 that only transmits s-polarized light. -
FIGS. 2, 4 , and 7-8 illustrate another embodiment of the waveguidepolarization recovery system 10 that has an alternative configuration in which the output light energy is perpendicular to the original input light energy. As in the embodiment ofFIG. 1 , theinput waveguide 20 introduces unpolarized input light at incidence to thePBS 30. Furthermore, thePBS 30 performs the same function of transmitting the p-polarized light, and so the p-polarized portion of the input light energy continues through in the same direction as the initial input while the s-polarized light is reflected in a perpendicular direction to the initial direction of input. However, in the configuration ofFIG. 2 , onemirror 60 redirects the transmitted p-polarized portion of the input light energy by 90° toward theoutput waveguide 50. Furthermore, the reflected s-polarized light from thePBS 30 propagates once through a quarter-wave plate 40′, and asecond mirror 60 then returns the reflected light energy to the quarter-wave plate 40′ for another pass. The second pass is also in the direction of theoutput waveguide 50. Because the reflected s-polarized light passes twice through the quarter-wave plate 40′, s-polarized light is shifted by a half-wave to become p-polarized twice with the mirror as shown. Again, both p-polarized outputs will be mixed in the output waveguide, producing a uniform intensity output. The embodiment ofFIG. 2 requires only two optical sections: A first section formed through the combination of theinput waveguide 20, thePBS 30, the quarter-wave plate 40′ and amirror 60; and a second section formed through the combination of theoutput waveguide 50 and asecond mirror 60. Therefore, the system has a simple design and a relatively low cost. Positioning the output light energy perpendicular to the original input light energy also has the advantage of allowing a more compact projection system, as described in greater detail below. - In contrast to the above-described configuration in which the
wave plate 40 modifies the light energy reflected by thePBS 30, other configurations for the waveguidepolarization recovery system 10 position the wave plate to modify the light energy transmitted by thePBS 30. For example,FIGS. 9 and 10 illustrate configurations in which the half-wave plate 40 is positioned to receive light energy transmitted by the PBS 30. In the configuration ofFIG. 9 , the half-wave plate 40 is optically positioned between amirror 60 and theoutput waveguide 50. The half-wave plate 40 receives transmitted light energy that has first been redirected by amirror 60. Similarly, inFIG. 10 , the half-wave plate 40 is placed between thePBS 30 andmirror 60. In this way, the transmitted light energy from thePBS 30 is first repolarized before being redirected toward theoutput waveguide 50. The configurations ofFIGS. 9-10 are advantageous because the input light energy only passes through the polarization layer of thePBS 30 once, thus reducing the loss of optical energy in thesystem 10. In contrast, the above-described configuration of theFIGS. 2, 4 , and 7-8 requires some of the input light energy to pass through thePBS 30 twice. - Elements of the Waveguide Polarization Recovery System
- The various configurations of the waveguide
polarization recovery system 10 use the same elements, which are now described in greater detail. - The
input waveguide 20 is typically an integrator that collects the light from a light source, such as an arc lamp, and mixes the light through multiple reflections to produce a more uniform intensity profile into the waveguidepolarization recovery system 10. Likewise, theoutput waveguide 50 is typically an integrator that collects the light from the waveguidepolarization recovery system 10 and mixes the light through multiple reflections to produce a more uniform intensity profile for illumination of the imager. Theinput waveguide 20 and theoutput waveguide 50 may be, for example, single core optic fibers, fused bundles of optic fibers, fiber bundles, solid or hollow square or rectangular light pipes, or homogenizers, which can be tapered or un-tapered. In optical projection systems, theinput waveguide 20 and theoutput waveguide 50 are typically rectangular in cross-section to correspond with the shape of the imager and the final projected image. Theinput waveguide 20 and theoutput waveguide 50 wave can be made from glass, quartz, or plastic depending on the power-handling requirement. - Either one or both of the
input waveguide 20 and theoutput waveguide 50 can have an increasing or decreasing taper as needed for the projection system. For example,FIG. 3-4 and 6-10 illustrate embodiments of the waveguidepolarization recovery system 10 in which theinput waveguide 20′ is a tapered rod with the input cross-section matched to the area of the light source and the output cross-section related to the dimensions of a LCD imager. The final dimensions for theinput waveguide 20 may vary as needed to minimize stray light loss in the optical projection system. Similarly,FIG. 8 illustrates an embodiment of the waveguidepolarization recovery system 10 in which theoutput waveguide 50′ is also tapered. Tapering of theoutput waveguide 50′ is advantageous because, depending on the performance parameters of thePBS 30, thewave plate 40, and the output requirements for the projection system, polarization recovery may not always be done at the same numerical aperture as the output aperture. The performances of thePBS 30 and thewave plate 40 are better at smaller numerical apertures, and as a result, advantageous increases in performance are achieved by transforming the input light energy into a larger area with a small numerical aperture and then transforming the light energy back into larger numerical apertures at the output of theoutput waveguide 50′. Overall, the tapering of theinput wave guide 20 and theoutput waveguide 50 can be selected to match the overall performance requirements of the projection system, and similarly, the input and output waveguides can be tapered in either direction. - The waveguide
polarization recovery system 10 further includesPBS 30. ThePBS 30 is a well-known optical element that transmits light energy of one polarization while reflecting light energy of a different polarization. Typically, thePBS 30 is a rectangular prism of optically clear material, such as plastic or glass, that has a polarizing coating applied to the diagonal surface. Alternatively, thePBS 30 may be composed of a material that selectively transmit light energy depending on the polarization of the light energy. However, it should be appreciated that there exist numerous alternative designs and types of PBS, and any of these alternative PBS's may be employed in the waveguidepolarization recovery system 10 of the present invention. Because thePBS 30 is a well known and commercially available item, it is not discussed further. - Another element of the waveguide
polarization recovery system 10 is thewave plate 40. Thewave plate 40 is an optically transparent component that modifies the polarization of light energy that passes through thewave plate 40. Thewave plate 40 typically changes the propagating of light in one oaxis, thus changes the polarization. Thewave plate 40 may be either a half-wave or quarter-wave as needed by the specific configuration of the waveguidepolarization recovery system 10. Overall, thewave plate 40 is a well known and commonly available item and will not be discussed further. - The waveguide
polarization recovery system 10 may further include one ormore mirrors 60 as needed to direct the light energy through the waveguidepolarization recovery system 10. While mirrors are commonly known to be metal-coated glass surfaces or polished metal, themirrors 60 should not be limited to this common definition for the purpose of this invention. Instead, mirrors 60 should be considered any optical component capable of reflecting or redirecting light energy. For example, mirrors 60 may be prisms that use the angle of incidence to capture and redirect light energy. For example,FIGS. 9 and 10 illustrate a waveguidepolarization recovery system 10 that has a prism to redirect light energy transmitted by thePBS 30 toward theoutput waveguide 50. For systems with small numerical apertures, total internal reflection at the prism can be used, and as a result, the coating is not necessary. - In another preferred embodiment of the present invention, illustrated in
FIGS. 6-10 , the waveguidepolarization recovery system 10 further includes one or more optically clear areas, or “gaps,” 70 between the other optical elements. Thegaps 70 may be pockets of air left between the optical components. Thegap 70 can also be filled with low index epoxy or other transparent material such that the total internal reflection still occurs, but the assembly of the components will be simplified. For example,FIG. 6 illustrates aconfiguration having gap 70 between theinput waveguide 20 and thePBS 30. Thisgap 70 ensures that light energy reflected by thediagonal PBS 30 is turned by 90° toward the quarter-wave plate 40′ because total internal reflection from the interface between thePBS 30 and thegap 70 prevents the light energy from returning instead to theinput waveguide 20 and exiting as a loss. The waveguidepolarization recovery system 10 inFIG. 6 also hasother gaps 70 to promote total internal reflection between the different optical elements. Similarly,FIG. 7 illustrates a waveguidepolarization recovery system 10 in whichgaps 70 have been added to a polarization recovery system with a taperedinput waveguide 20 and perpendicularly configuredoutput waveguide 50 illustrated inFIG. 4 . Again thesegaps 70 increase the efficiency by encouraging total internal reflection between the optical components. As illustrated inFIGS. 6-7 , thegaps 70, while increasing the efficiency of the system, cause the waveguidepolarization recovery system 10 to become more complex with an increased number of discrete parts. - In the above-described configurations of
FIG. 9-10 , thegaps 70 further serve the purpose of improving the performance of theprism 60′ that serves as a mirror to direct the light energy toward theoutput waveguide 50. In particular, thegap 70 is needed between thePBS 30 and theprism 60′ such that the light reflected from the hypotenuse of theprism 60′, back toward thePBS 30, hits this interface of thegap 70 and is internally reflected toward theoutput waveguide 50. In this way, efficiency of the system is improved by minimizing loss. - The performance advantages of the
gaps 70 may be further increased through the use of anti-reflection coating on both surfaces such that the transmitted light suffers minimal loss. -
FIG. 5 illustrates aprojector 100 that employs the waveguidepolarization recovery system 10. Theprojector 100 consists of alight collecting system 110, which in this illustrated example has two paraboloid reflectors and a retro-reflector that increase the output by reflecting the light from alight source 120 back into itself. The arc of thelight source 120 is placed at a focus of the first paraboloid reflector and the proximal end of theinput waveguide 20 is at the focus of the second paraboloid reflector. It should be appreciated that thislight collection system 110 is provided merely for illustration, and many other light collection systems are known and may be used. Likewise, thelight source 120 may be an arc lamp, such as xenon, metal-halide lamp, HID, or mercury lamps, or a filament lamp, such as a halogen lamp, provided that the system is modified to accommodate the non-opaque filaments of the lamp. - Within the illustrated
projector 100, theinput waveguide 20 is a tapered light pipe that is designed to match the light input collected from thelight collecting system 110 to the optical needs of anLCD imager 150. As described above inFIG. 4 , the light output of theinput waveguide 20 is polarized by thePBS 30 and the other polarization is recovered by the quarter-wave plate 40′. Theoutput waveguide 50 then directs the polarized optical energy toward theLCD imager 150. In this case, the light output in theoutput waveguide 50 is then incident into asecond PBS 130 whose orientation is matched to the polarization of the incident light to minimize the loss. A color wheel 140, or other type of color selection system, and thereflective LCD imager 150 create the projected image by theprojection lenses 160 in a traditional manner. As shown inFIG. 5 , the number of optical elements is minimal and, as the result, the cost for the projector is relatively low. - It should be appreciated that the waveguide
polarization recovery system 10 may be used in other types of projection systems. For example, the projector may also use two or threeimagers 150 to define the projected image. Theimager 150 may also be a reflective display using liquid crystal on silicon (“LCOS”) technology, or any other type of systems that requires polarized light. Similarly, the color wheel 140 can also be replaced by electrically switchable color system without moving parts or other known color projection systems. - While the invention has been described with reference to the structures disclosed herein, it is not confined to the details set forth, and this application is intended to cover such modifications or changes as may come within the purposes of the improvements or the scope of the following claims.
Claims (14)
1-20. (canceled)
21. A method of polarization recovery comprising:
transmitting light energy of a first polarization type;
reflecting light energy of a second polarization type;
modifying the polarization of a substantial portion of either the transmitted or the reflected light energy;
integrating a substantial portion of both the transmitted light energy and the reflected light energy.
22. The method of polarization recovery of claim 21 , comprising further:
integrating a substantial portion of the emitted light energy.
23. The method of polarization recovery of claim 21 , comprising further:
redirecting a substantial portion of the transmitted light energy.
24. The method of polarization recovery of claim 21 , comprising further:
redirecting a substantial portion of the reflected light energy.
25. The method of polarization recovery of claim 21 , comprising further:
imaging a substantial portion of the integrated light energy.
26. A system of polarization recovery comprising:
means for transmitting light energy of a first polarization type;
means for reflecting light energy of a second polarization type;
means for modifying the polarization of a substantial portion of either the transmitted or the reflected light energy; and
means for integrating a substantial portion of both the transmitted light energy and the reflected light energy.
27. The system of polarization recovery of claim 26 , further comprising means for integrating a substantial portion of the emitted light energy.
28. The system of polarization recovery of claim 26 , further comprising means for redirecting the transmitted light energy towards the polarization modification means.
29. The system of polarization recovery of claim 26 , further comprising means for redirecting the reflected light energy towards the polarization modification means.
30. The system of polarization recovery of claim 26 , further comprising means for redirecting the transmitted light energy towards the integration means.
31. The system of polarization recovery of claim 26 , further comprising means for redirecting the reflected light energy towards the integration means.
32. The system of polarization recovery of claim 26 , further comprising means for imaging the integration light energy.
33. The system of polarization recovery of claim 26 , further comprising means for focusing the integrated light energy.
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090213448A1 (en) * | 2008-02-27 | 2009-08-27 | Himax Display, Inc. | Optical system |
US20100060867A1 (en) * | 2008-09-05 | 2010-03-11 | Kenneth Li | Pseudo light pipe for coupling of light for dual paraboloid reflector (dpr) system |
US20130070449A1 (en) * | 2011-09-17 | 2013-03-21 | Appotronics Corporation Limited | High recycling efficiency solid state light source device |
Families Citing this family (101)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6587269B2 (en) * | 2000-08-24 | 2003-07-01 | Cogent Light Technologies Inc. | Polarization recovery system for projection displays |
US7710669B2 (en) * | 2000-08-24 | 2010-05-04 | Wavien, Inc. | Etendue efficient combination of multiple light sources |
US6856727B2 (en) * | 2001-03-02 | 2005-02-15 | Wavien, Inc. | Coupling of light from a non-circular light source |
KR100879407B1 (en) * | 2001-04-25 | 2009-01-19 | 웨이비엔, 인코포레이티드 | Light recovery for projection displays |
JP4061857B2 (en) * | 2001-04-27 | 2008-03-19 | 株式会社日立製作所 | Optical unit and video display device using the same |
GB0116446D0 (en) * | 2001-07-06 | 2001-08-29 | Barco Nv | Smearing reduction on lcd and lcos projectors |
US20040170725A1 (en) * | 2001-07-09 | 2004-09-02 | Eric Begleiter | Edible articles that include edible optical elements and methods for producing same |
US6827450B1 (en) | 2001-10-05 | 2004-12-07 | Jds Uniphase Corporation | Scrolling color projection system |
US6795243B1 (en) | 2001-10-05 | 2004-09-21 | Optical Coating Laboratory, Inc. | Polarizing light pipe |
JP2003202523A (en) * | 2001-11-02 | 2003-07-18 | Nec Viewtechnology Ltd | Polarization unit, polarization illumination device and projection type display device using the illumination device |
US20030112511A1 (en) * | 2001-12-19 | 2003-06-19 | Koninklijke Philips Electronics N.V. | Polarization conversion method for liquid crystal displays |
JP3562513B2 (en) * | 2002-01-25 | 2004-09-08 | ソニー株式会社 | Image display device |
US20050243415A1 (en) * | 2002-02-06 | 2005-11-03 | Lowe Anthony C | Display with optical fibre face plate |
US6836576B2 (en) * | 2002-02-08 | 2004-12-28 | Wavien, Inc. | Polarization recovery system using light pipes |
KR100839285B1 (en) * | 2002-04-23 | 2008-06-17 | 엘지전자 주식회사 | System of projection using of color drum |
JP3991764B2 (en) * | 2002-05-10 | 2007-10-17 | セイコーエプソン株式会社 | Illumination device and projection display device |
US7131736B2 (en) * | 2002-05-17 | 2006-11-07 | Bierhuizen Serge J A | Efficient illumination systems for reduced étendue color video projection systems |
US6839095B2 (en) * | 2002-05-17 | 2005-01-04 | Infocus Corporation | Single-path color video projection systems employing reflective liquid crystal display devices |
US20030218726A1 (en) * | 2002-05-23 | 2003-11-27 | Huibers Andrew G. | Light recapture projection system |
US6886941B2 (en) * | 2002-06-04 | 2005-05-03 | Koninklijke Philips Electronics N.V. | Compact light engine with light guides for projection display system |
US7929214B2 (en) * | 2002-11-07 | 2011-04-19 | Sony Deutschland Gmbh | Illumination arrangement for a projection system |
US20050174641A1 (en) * | 2002-11-26 | 2005-08-11 | Jds Uniphase Corporation | Polarization conversion light integrator |
JP3951180B2 (en) * | 2003-02-04 | 2007-08-01 | ソニー株式会社 | Polarization conversion element, illumination optical system, and projector |
EP1597514A4 (en) * | 2003-02-21 | 2009-08-26 | Wavien Inc | Polarization recovery system using redirection |
IL154680A (en) * | 2003-02-27 | 2010-05-17 | Avram Matcovitch | System for recovering input polarization state of optical beam at proportional intensity |
US7237899B2 (en) | 2003-05-16 | 2007-07-03 | 3M Innovative Properties Company | Highly efficient single panel and two panel projection engines |
US20040227994A1 (en) * | 2003-05-16 | 2004-11-18 | Jiaying Ma | Polarizing beam splitter and projection systems using the polarizing beam splitter |
CN100371744C (en) * | 2003-05-21 | 2008-02-27 | Jds尤尼弗思公司 | System and method for providing a uniform source of light |
JP2007503625A (en) * | 2003-06-09 | 2007-02-22 | ウェイヴィーン・インコーポレイテッド | Projection engine based on light pipe |
US7306344B2 (en) * | 2003-06-10 | 2007-12-11 | Abu-Ageel Nayef M | Light guide array, fabrication methods and optical system employing same |
US7228037B2 (en) * | 2003-06-10 | 2007-06-05 | Lucent Technologies Inc. | Integrated polarization beam splitter with quarter-wave plate for polarimeter and PMD compensation applications |
US7298940B2 (en) * | 2003-06-10 | 2007-11-20 | Abu-Ageel Nayef M | Illumination system and display system employing same |
TWI289691B (en) * | 2003-06-23 | 2007-11-11 | Seiko Epson Corp | Light conducting unit, illumination apparatus, and projection type display apparatus |
CN1813216A (en) * | 2003-06-24 | 2006-08-02 | 皇家飞利浦电子股份有限公司 | Method and apparatus for recycling reflected light in optical systems as e.g. projection display |
DE10328698A1 (en) * | 2003-06-26 | 2005-01-13 | Carl Zeiss Jena Gmbh | Optical system for polarizing light for use in such as LCD projectors has multiple optical prisms |
JP4100276B2 (en) * | 2003-07-04 | 2008-06-11 | セイコーエプソン株式会社 | Lighting device and projector |
JP5085127B2 (en) * | 2003-07-23 | 2012-11-28 | トムソン ライセンシング | Illumination device with polarization recycling in a double prism |
US20050231958A1 (en) * | 2004-02-09 | 2005-10-20 | Gregory Cutler | Illumination system with improved optical efficiency |
US20050219845A1 (en) * | 2004-02-09 | 2005-10-06 | Gregory Cutler | Illumination system with improved optical efficiency |
JP4144532B2 (en) * | 2004-02-23 | 2008-09-03 | セイコーエプソン株式会社 | Illumination device and projection display device |
WO2005088365A1 (en) * | 2004-03-11 | 2005-09-22 | Thomson Licensing | Multiple lamp illumination system with polarization recovery and integration |
US6980346B1 (en) * | 2004-09-15 | 2005-12-27 | Hewlett-Packard Development Company, L.P. | Display device |
US20060082888A1 (en) * | 2004-10-19 | 2006-04-20 | Andrew Huibers | Optically reconfigurable light integrator in display systems using spatial light modulators |
US20060109753A1 (en) * | 2004-11-23 | 2006-05-25 | Fergason James L | Monitor for showing high-resolution and three-dimensional images and method |
US20060139580A1 (en) * | 2004-12-29 | 2006-06-29 | Conner Arlie R | Illumination system using multiple light sources with integrating tunnel and projection systems using same |
US7237900B2 (en) * | 2004-12-30 | 2007-07-03 | United Microdisplay Optronics Corp. | Polarization conversion system |
US7325957B2 (en) * | 2005-01-25 | 2008-02-05 | Jabil Circuit, Inc. | Polarized light emitting diode (LED) color illumination system and method for providing same |
CN101248384B (en) * | 2005-02-09 | 2013-04-10 | 微阳有限公司 | Etendue efficient combination of multiple light sources |
US7369317B2 (en) * | 2005-03-07 | 2008-05-06 | Himax Technologies, Inc. | Head-mounted display utilizing an LCOS panel with a color filter attached thereon |
US20060232762A1 (en) * | 2005-04-15 | 2006-10-19 | Specialty Minerals (Michigan) Inc. | Optical element, measuring apparatus and measuring method |
TWI269112B (en) * | 2005-04-28 | 2006-12-21 | Young Optics Inc | Optical projecting device and polarizing light source module thereof |
DE102005020539A1 (en) * | 2005-05-03 | 2006-11-09 | Carl Zeiss Jena Gmbh | Arrangement for producing a multicolored image on a projection surface |
US7434946B2 (en) * | 2005-06-17 | 2008-10-14 | Texas Instruments Incorporated | Illumination system with integrated heat dissipation device for use in display systems employing spatial light modulators |
JP4972883B2 (en) * | 2005-06-17 | 2012-07-11 | 株式会社日立製作所 | Optical unit and projection-type image display device |
JP2007011154A (en) * | 2005-07-04 | 2007-01-18 | Hitachi Ltd | Screen and image display device using the same |
JP4736570B2 (en) * | 2005-07-04 | 2011-07-27 | セイコーエプソン株式会社 | Lighting device and projector |
JP2007025308A (en) * | 2005-07-19 | 2007-02-01 | Hitachi Ltd | Projection type video display apparatus and color separation unit |
JP4872272B2 (en) * | 2005-08-29 | 2012-02-08 | セイコーエプソン株式会社 | Lighting device and projector |
JP4872279B2 (en) * | 2005-09-06 | 2012-02-08 | セイコーエプソン株式会社 | Lighting device and projector |
JP4788275B2 (en) * | 2005-10-04 | 2011-10-05 | 株式会社日立製作所 | Projection-type image display device |
CN100468127C (en) * | 2005-10-07 | 2009-03-11 | 鸿富锦精密工业(深圳)有限公司 | Projection display device |
US7508590B2 (en) * | 2005-12-09 | 2009-03-24 | Scram Technologies, Inc. | Optical system for a digital light projection system including 3-channel and 4-channel LED array light engines |
US7973996B2 (en) * | 2005-12-09 | 2011-07-05 | Scram Technologies, Inc. | Optical system for a digital light projection system including a 3-channel LED array light engine |
JP2007163597A (en) | 2005-12-09 | 2007-06-28 | Canon Inc | Wavelength selective polarization conversion element, illumination optical system, projection display optical system and image projection apparatus |
US20070146880A1 (en) * | 2005-12-27 | 2007-06-28 | Jvc Americas Corporation | Optical device for splitting an incident light into simultaneously spectrally separated and orthogonally polarized light beams having complementary primary color bands |
TWI284777B (en) * | 2005-12-29 | 2007-08-01 | Coretronic Corp | Projector and integration rod thereof |
JP4988209B2 (en) * | 2006-01-13 | 2012-08-01 | 三洋電機株式会社 | Rod fixing structure and projection-type image display device |
TW200823497A (en) * | 2006-11-17 | 2008-06-01 | Benq Corp | Light integrating system |
WO2008011480A2 (en) * | 2006-07-18 | 2008-01-24 | Colorlink, Inc. | Light collectors for projection systems |
WO2008027692A2 (en) * | 2006-08-02 | 2008-03-06 | Abu-Ageel Nayef M | Led-based illumination system |
JP5191771B2 (en) * | 2007-04-04 | 2013-05-08 | パナソニック株式会社 | Surface illumination device and liquid crystal display device using the same |
US7821713B2 (en) * | 2007-05-18 | 2010-10-26 | 3M Innovative Properties Company | Color light combining system for optical projector |
US7537352B2 (en) * | 2007-10-22 | 2009-05-26 | Young Optics Inc. | Light emitting diode illumination device capable of providing uniformly polarized light |
US8085359B2 (en) * | 2008-04-16 | 2011-12-27 | Honeywell International Inc. | Folded backlight systems having low index regions that prevent light failing to meet total internal reflection conditions from entering a plate portion and liquid crystal displays using the same |
US20090310042A1 (en) * | 2008-06-16 | 2009-12-17 | Marcial Vidal | Illumination system and method with efficient polarization recovery |
US8760507B2 (en) * | 2008-08-05 | 2014-06-24 | Inspectron, Inc. | Light pipe for imaging head of video inspection device |
US20100202129A1 (en) * | 2009-01-21 | 2010-08-12 | Abu-Ageel Nayef M | Illumination system utilizing wavelength conversion materials and light recycling |
US20100245771A1 (en) * | 2009-03-26 | 2010-09-30 | Jiangsu Lexvu Electronics Co., Ltd. | Polarization conversion assembly and single-imager micro projection engine |
US11726332B2 (en) | 2009-04-27 | 2023-08-15 | Digilens Inc. | Diffractive projection apparatus |
IT1399180B1 (en) | 2009-06-12 | 2013-04-11 | Sharp Kk | SOLAR SIMULATOR |
US8098339B2 (en) * | 2009-06-23 | 2012-01-17 | Shanghai Lexvu Opto Microelectronics Technology Co., Ltd. | Integrated single panel projection engine |
US8905547B2 (en) * | 2010-01-04 | 2014-12-09 | Elbit Systems Of America, Llc | System and method for efficiently delivering rays from a light source to create an image |
TW201144864A (en) * | 2010-06-10 | 2011-12-16 | Hon Hai Prec Ind Co Ltd | Intensifying device with polarization light conversion function |
TWI406011B (en) * | 2010-06-18 | 2013-08-21 | Univ Nat Taipei Technology | Optical system capable of enhancing polarization state of light and light source system including same |
CN103487945B (en) * | 2013-09-30 | 2016-01-20 | 中国科学院光电技术研究所 | High efficiency polarization purification device |
KR102156408B1 (en) | 2013-11-19 | 2020-09-16 | 삼성전자주식회사 | Display device and image generating method for layered display scheme |
US9798154B2 (en) * | 2014-02-28 | 2017-10-24 | Microsoft Technology Licensing, Llc | Control of polarization and diffractive artifact resolution in retro-imaging systems |
KR102562730B1 (en) | 2015-10-30 | 2023-08-01 | 쇠라 테크널러지스 인코포레이티드 | Additive Manufacturing Systems and Methods |
WO2017217189A1 (en) * | 2016-06-17 | 2017-12-21 | オリンパス株式会社 | Objective optical system and endoscope device provided with same |
US10139644B2 (en) * | 2016-07-01 | 2018-11-27 | Tilt Five, Inc | Head mounted projection display with multilayer beam splitter and color correction |
KR102453653B1 (en) | 2017-05-11 | 2022-10-11 | 쇠라 테크널러지스 인코포레이티드 | Switchyard Beam Routing of Patterned Light for Additive Manufacturing |
KR102565351B1 (en) | 2018-07-25 | 2023-08-16 | 현대자동차주식회사 | Lamp apparatus for vehicle |
US10677834B2 (en) * | 2018-09-14 | 2020-06-09 | Schweitzer Engineering Laboratories, Inc. | Distance protection of electric power delivery systems using time domain and frequency domain |
CN111158159B (en) * | 2018-11-08 | 2021-09-21 | 舜宇光学(浙江)研究院有限公司 | Polarization multiplexing device for projection system |
CN109581578B (en) * | 2019-01-15 | 2020-09-01 | 惠州市华星光电技术有限公司 | Backlight module and liquid crystal display device |
US11029564B1 (en) * | 2019-12-19 | 2021-06-08 | Lumileds Llc | Polarizing edge coupled light in backlight |
CN111650758B (en) * | 2020-08-03 | 2022-06-14 | 曹旸 | Light splitting module and waveguide display structure |
JP7481225B2 (en) * | 2020-10-08 | 2024-05-10 | エルジー ディスプレイ カンパニー リミテッド | Head-mounted display |
WO2022086755A1 (en) * | 2020-10-15 | 2022-04-28 | Perdix Systems Llc | Optical systems for providing polarized light to a waveguide |
US11735907B2 (en) | 2021-02-03 | 2023-08-22 | Schweitzer Engineering Laboratories, Inc. | Traveling wave overcurrent protection for electric power delivery systems |
US20230314804A1 (en) * | 2022-03-31 | 2023-10-05 | Microsoft Technology Licensing, Llc | Polarization-recycling waveguided illumination system for microdisplay |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5884991A (en) * | 1997-02-18 | 1999-03-23 | Torch Technologies Llc | LCD projection system with polarization doubler |
US5995284A (en) * | 1996-03-29 | 1999-11-30 | 3M Innovative Properties Company | Polarized illumination system for LCD projector |
Family Cites Families (38)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3511556A (en) * | 1967-11-30 | 1970-05-12 | Sylvania Electric Prod | Optical polarizing prism |
FR2182614B1 (en) * | 1972-03-17 | 1978-05-05 | Louyot Comptoir Lyon Alemand | |
GB1544483A (en) * | 1976-07-01 | 1979-04-19 | Standard Telephones Cables Ltd | Strain measurement using optical fibres |
US4765718A (en) * | 1987-11-03 | 1988-08-23 | General Electric Company | Collimated light source for liquid crystal display utilizing internally reflecting light pipe collimator with offset angle correction |
JPH03175412A (en) * | 1989-12-05 | 1991-07-30 | Victor Co Of Japan Ltd | Polarization converting element |
US5139824A (en) * | 1990-08-28 | 1992-08-18 | Liburdi Engineering Limited | Method of coating complex substrates |
US5751480A (en) * | 1991-04-09 | 1998-05-12 | Canon Kabushiki Kaisha | Plate-like polarizing element, a polarizing conversion unit provided with the element, and a projector provided with the unit |
US5381278A (en) * | 1991-05-07 | 1995-01-10 | Canon Kabushiki Kaisha | Polarization conversion unit, polarization illumination apparatus provided with the unit, and projector provided with the apparatus |
US5301030A (en) | 1991-08-13 | 1994-04-05 | Samsung Electronics Co., Ltd. | Optical illumination apparatus for a display unit with efficient light source polarization |
WO1993024857A1 (en) | 1992-06-01 | 1993-12-09 | Bell Communications Research, Inc. | Polarization-independent display system |
US5303083A (en) * | 1992-08-26 | 1994-04-12 | Hughes Aircraft Company | Polarized light recovery |
WO1995027919A2 (en) | 1994-04-06 | 1995-10-19 | Minnesota Mining And Manufacturing Company | Polarized light sources |
US5625738A (en) * | 1994-06-28 | 1997-04-29 | Corning Incorporated | Apparatus for uniformly illuminating a light valve |
JP3219943B2 (en) | 1994-09-16 | 2001-10-15 | 株式会社東芝 | Planar direct-view display device |
US5513023A (en) | 1994-10-03 | 1996-04-30 | Hughes Aircraft Company | Polarizing beamsplitter for reflective light valve displays having opposing readout beams onto two opposing surfaces of the polarizer |
US6560018B1 (en) * | 1994-10-27 | 2003-05-06 | Massachusetts Institute Of Technology | Illumination system for transmissive light valve displays |
DE69611563T2 (en) | 1995-03-23 | 2001-06-21 | International Business Machines Corp., Armonk | Effective optical system for a high-resolution projection display with reflection light valves |
US6104454A (en) | 1995-11-22 | 2000-08-15 | Hitachi, Ltd | Liquid crystal display |
US5892357A (en) * | 1995-12-08 | 1999-04-06 | Lockheed Martin Idaho Technologies Company | Electro-optic voltage sensor for sensing voltage in an E-field |
JPH09326205A (en) | 1996-06-06 | 1997-12-16 | Hitachi Ltd | Backlight and liquid crystal display device |
US6053615A (en) * | 1996-08-02 | 2000-04-25 | In Focus Systems, Inc. | Image projector with polarization conversion system |
US6257726B1 (en) * | 1997-02-13 | 2001-07-10 | Canon Kabushiki Kaisha | Illuminating apparatus and projecting apparatus |
JP3697013B2 (en) * | 1997-02-19 | 2005-09-21 | キヤノン株式会社 | Illumination device and projection device using the same |
JPH10319350A (en) * | 1997-05-23 | 1998-12-04 | Victor Co Of Japan Ltd | Polarization illuminating device and projection type display device |
TW401709B (en) * | 1997-12-01 | 2000-08-11 | Matsushita Electric Ind Co Ltd | Polaroid light illuminating apparature and a projective portrait display |
JPH11281930A (en) * | 1998-03-27 | 1999-10-15 | Mitsubishi Electric Corp | Projection display device |
JP2000035544A (en) * | 1998-07-16 | 2000-02-02 | Asahi Optical Co Ltd | Light guide connector connecting part of endoscope device |
CA2290860C (en) * | 1998-11-27 | 2007-05-22 | National Research Council Of Canada | Polarizing back-lighting system for direct view liquid crystal displays |
US6678078B1 (en) * | 1999-01-07 | 2004-01-13 | Digilens, Inc. | Optical filter employing holographic optical elements and image generating system incorporating the optical filter |
JP3372883B2 (en) * | 1999-01-08 | 2003-02-04 | エヌイーシービューテクノロジー株式会社 | Projector device |
US6160665A (en) * | 1999-06-04 | 2000-12-12 | Chorum Technologies Inc. | High extinction ratio polarization beamsplitter |
TW386177B (en) | 1999-09-03 | 2000-04-01 | Primax Electronics Ltd | A projection display device for displaying electronic images |
US6375330B1 (en) * | 1999-12-30 | 2002-04-23 | Gain Micro-Optics, Inc. | Reflective liquid-crystal-on-silicon projection engine architecture |
CA2400828A1 (en) * | 2000-02-22 | 2001-08-30 | Graffinity Pharmaceutical Design Gmbh | Spr sensor system |
US6411749B2 (en) * | 2000-05-11 | 2002-06-25 | Micro-Optice, Inc. | In-line fiber optic polarization combiner/divider |
US6587269B2 (en) * | 2000-08-24 | 2003-07-01 | Cogent Light Technologies Inc. | Polarization recovery system for projection displays |
US7006735B2 (en) * | 2002-06-04 | 2006-02-28 | Koninklijke Philips Electronics N.V. | Loss-less etendue-preserving light guides |
US7252399B2 (en) * | 2003-08-14 | 2007-08-07 | Jds Uniphase Corporation | Folding converging light into a lightpipe |
-
2001
- 2001-03-23 US US09/814,970 patent/US6587269B2/en not_active Expired - Lifetime
- 2001-07-30 CA CA002420334A patent/CA2420334C/en not_active Expired - Fee Related
- 2001-07-30 JP JP2002521635A patent/JP4994561B2/en not_active Expired - Fee Related
- 2001-07-30 AU AU2001280862A patent/AU2001280862A1/en not_active Abandoned
- 2001-07-30 EP EP01959290A patent/EP1311894B1/en not_active Expired - Lifetime
- 2001-07-30 WO PCT/US2001/023758 patent/WO2002017000A2/en active IP Right Grant
- 2001-07-30 DE DE60122746T patent/DE60122746T2/en not_active Expired - Lifetime
- 2001-07-30 CN CNA018178170A patent/CN1636159A/en active Pending
- 2001-08-22 TW TW90120637A patent/TW575781B/en not_active IP Right Cessation
-
2003
- 2003-01-21 US US10/347,522 patent/US6982830B2/en not_active Expired - Lifetime
- 2003-02-24 KR KR1020037002693A patent/KR100877011B1/en not_active IP Right Cessation
- 2003-09-20 HK HK03106768.4A patent/HK1054589B/en not_active IP Right Cessation
-
2004
- 2004-05-21 US US10/850,438 patent/US20040257654A1/en not_active Abandoned
- 2004-05-21 US US10/850,469 patent/US20040257653A1/en not_active Abandoned
- 2004-05-21 US US10/850,467 patent/US7092159B2/en not_active Expired - Lifetime
- 2004-05-21 US US10/850,571 patent/US20040258342A1/en not_active Abandoned
- 2004-06-30 US US10/879,726 patent/US7006288B2/en not_active Expired - Lifetime
- 2004-07-07 US US10/885,123 patent/US20040240058A1/en not_active Abandoned
- 2004-07-07 US US10/885,124 patent/US20040240059A1/en not_active Abandoned
-
2005
- 2005-02-18 US US11/060,401 patent/US7002745B2/en not_active Expired - Lifetime
- 2005-09-30 US US11/240,169 patent/US7130122B2/en not_active Expired - Lifetime
- 2005-11-09 US US11/270,683 patent/US20060056025A1/en not_active Abandoned
-
2006
- 2006-04-28 US US11/414,755 patent/US7339735B2/en not_active Expired - Fee Related
- 2006-06-26 US US11/475,375 patent/US20060239602A1/en not_active Abandoned
- 2006-10-31 US US11/590,721 patent/US20070047078A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5995284A (en) * | 1996-03-29 | 1999-11-30 | 3M Innovative Properties Company | Polarized illumination system for LCD projector |
US5884991A (en) * | 1997-02-18 | 1999-03-23 | Torch Technologies Llc | LCD projection system with polarization doubler |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090213448A1 (en) * | 2008-02-27 | 2009-08-27 | Himax Display, Inc. | Optical system |
US7616381B2 (en) | 2008-02-27 | 2009-11-10 | Himax Display Inc. | Optical system |
US20100060867A1 (en) * | 2008-09-05 | 2010-03-11 | Kenneth Li | Pseudo light pipe for coupling of light for dual paraboloid reflector (dpr) system |
WO2010028344A1 (en) * | 2008-09-05 | 2010-03-11 | Wavien, Inc. | Pseudo light pipe for coupling of light for dual paraboloid reflector (dpr) system |
US20130070449A1 (en) * | 2011-09-17 | 2013-03-21 | Appotronics Corporation Limited | High recycling efficiency solid state light source device |
US8919993B2 (en) * | 2011-09-17 | 2014-12-30 | Appotronics Corporation Limited | High recycling efficiency solid state light source device |
US9091409B2 (en) | 2011-09-17 | 2015-07-28 | Appotronics Corporation Limited | High recycling efficiency solid state light source device |
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