US20080018861A1 - Light collectors for projection systems - Google Patents

Light collectors for projection systems Download PDF

Info

Publication number
US20080018861A1
US20080018861A1 US11/779,706 US77970607A US2008018861A1 US 20080018861 A1 US20080018861 A1 US 20080018861A1 US 77970607 A US77970607 A US 77970607A US 2008018861 A1 US2008018861 A1 US 2008018861A1
Authority
US
United States
Prior art keywords
light
lightpipe
output
light source
operable
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.)
Abandoned
Application number
US11/779,706
Other languages
English (en)
Inventor
Miller H. Schuck
Michael G. Robinson
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.)
RealD Inc
Original Assignee
Colorlink 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
Application filed by Colorlink Inc filed Critical Colorlink Inc
Priority to US11/779,706 priority Critical patent/US20080018861A1/en
Assigned to COLORLINK, INC. reassignment COLORLINK, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ROBINSON, MICHAEL G., SCHUCK, MILLER H.
Publication of US20080018861A1 publication Critical patent/US20080018861A1/en
Assigned to REAL D reassignment REAL D ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: COLORLINK, INC.
Abandoned legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0096—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the lights guides being of the hollow type
    • 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
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/0994—Fibers, light pipes
    • 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
    • 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
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2013—Plural light sources
    • 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
    • G03B21/208—Homogenising, shaping of the illumination light
    • 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
    • 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
    • H04N9/3158—Modulator illumination systems for controlling the spectrum
    • 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

  • This disclosure generally relates to a light collection system, and more specifically relates to a non-imaging collector for a projection system.
  • Étendue is a property of an optical system. It is given by the cross-sectional area of a cone of light (in the plane perpendicular to the propagation direction), times the solid angle subtended by the light. Other names for this property are acceptance, throughput, light-grasp, collecting power, and the A ⁇ product. Étendue is important because it never increases in any optical system. A perfect optical system produces an image with the same étendue as the source.
  • étendue is in determining optical system throughput. Any given source emits light into an optical system with efficiency dependent on the system étendue. Most surface emitting light sources (e.g., light emitting diodes) do not match the étendue required of projection panels. The die are either too small, requiring the addition of die, or too large, requiring some sort of aperture to reduce the LED étendue to match the panel étendue.
  • the light collectors gather light from surface emitting sources (e.g., LEDs) of differing color (or same color in some embodiments) using input lightpipes.
  • a light collection system splits the light into orthogonal linear polarization states and efficiently propagates the light by use of a polarizing beamsplitter (PBS) and a reflecting element to recycle light at a port of the PBS.
  • PBS polarizing beamsplitter
  • the light collection system may efficiently homogenize the light using an output lightpipe in a lightpath from the output of the PBS elements.
  • the light collection system may present a single, linear polarization at the output through the use of a ColorSelect filter in some embodiments or a switchable half-wave rotator (e.g., an LC cell) in other embodiments.
  • the light collection system may be integrated into a single, monolithic glass, plastic or combination glass/plastic assembly.
  • an apparatus for a projection system includes first and second lightpipes, a PBS, first and second quarter wave plates, and a reflecting element.
  • the first and second lightpipes are respectively operable to receive light from first and second light sources.
  • the PBS has first and second input ports and first and second output ports.
  • the first quarter wave plate is optically coupled to the first lightpipe and the first input port, and located between the first lightpipe and the first input port.
  • the second quarter wave plate is optically coupled to the second lightpipe and the second input port, and located between the second lightpipe and the second input port.
  • the reflecting element is located at the first output port and operable to reflect light toward the first input port.
  • the apparatus may further include a ColorSelect filter located in a light path exiting the PBS or an output lightpipe carrying light from the PBS, where the ColorSelect filter is operable to polarize an additive color spectrum along a first axis and its compliment color spectrum along a second axis.
  • the first light source may provide an additive color spectrum
  • the second light source may provide a complementary color spectrum.
  • the apparatus may further include (instead of the ColorSelect filter) a switchable half-wave rotator located in a light path exiting the PBS or an output lightpipe carrying light from the PBS.
  • the first and second light sources may be the same color, with the first and second light sources being temporally modulated to alternately provide a periodic high-intensity output.
  • FIG. 1 is a schematic diagram of a first embodiment of a light collection system in accordance with the present disclosure
  • FIG. 2 is a graph illustrating angular intensity distribution in the far field for exemplary red, green, and blue Light Emitting Diode (LED) devices in accordance with the present disclosure
  • FIG. 3A is a schematic diagram illustrating the relationship of luminous output to the aperture die area of an LED in accordance with the present disclosure
  • FIG. 3B is a schematic diagram illustrating the relationship of luminous output to the aperture angular output of an LED in accordance with the present disclosure
  • FIG. 4 is a schematic diagram showing a three-dimensional view of an exemplary tapered lightpipe in accordance with the present disclosure
  • FIG. 5A is a schematic diagram showing a top view of the exemplary tapered lightpipe of FIG. 4 ;
  • FIG. 5B is a schematic diagram showing a side view of the exemplary tapered lightpipe of FIG. 4 ;
  • FIG. 6A is a graph illustrating cross-sectional illuminance through the output lightpipe of FIG. 1 at a position of 0 mm along the optical axis, in accordance with the present disclosure
  • FIG. 6B is a graph illustrating cross-sectional illuminance through the output lightpipe of FIG. 1 at a position of 0 mm along the optical axis, in accordance with the present disclosure
  • FIG. 6C is a graph illustrating cross-sectional illuminance through the output lightpipe of FIG. 1 at a position of 0 mm along the optical axis, in accordance with the present disclosure
  • FIG. 6D is a graph illustrating cross-sectional illuminance through the output lightpipe of FIG. 1 at a position of 0 mm along the optical axis, in accordance with the present disclosure
  • FIG. 7 is a schematic diagram illustrating a second embodiment of a light collection system, including lens arrays and condenser homogenizing optics, in accordance with the present disclosure
  • FIG. 8 is a schematic diagram illustrating a third embodiment of a light collection system, including lens arrays and condenser homogenizing optics with a first lens array attached to a prism assembly, in accordance with the present disclosure
  • FIG. 9 is a schematic diagram illustrating a fourth embodiment of a light collection system, including a condenser lens and a non-imaging collector as the homogenizing optic, in accordance with the present disclosure
  • FIG. 10 is a schematic diagram illustrating a fifth embodiment of a light collection system, including a condenser lens and field lens as the homogenizing optic, in accordance with the present disclosure
  • FIG. 11 is a schematic diagram illustrating a sixth embodiment of a light collection system, which provides light recycling, in accordance with the present disclosure
  • FIG. 12 is a schematic diagram illustrating a seventh embodiment of a light collection system, which provides light recycling with a homogenizing optic at the output, in accordance with the present disclosure
  • FIG. 13 is a schematic diagram illustrating an eighth embodiment of a light collection system, with a dual PBS structure, in accordance with the present disclosure.
  • FIG. 14 is a schematic diagram illustrating a ninth embodiment of a light collection system, in accordance with the present disclosure.
  • the light source combining devices for use in projection applications.
  • the light source combining devices may provide a linearly polarized, spatially uniform output with well defined output area and distribution angles to an LCOS, DLP or LCD modulating panel.
  • the illuminator provides higher luminous output into a given étendue.
  • FIG. 1 is a schematic diagram of a first embodiment of a light collection system 100 .
  • Light collection system 100 includes tapered lightpipes 102 , 106 , a polarization beam splitter (PBS) 110 , a polarization rotation element 120 , a reflecting element 122 , an output lightpipe 124 , and a G′/G ColorSelect® filter 126 , arranged as shown.
  • PBS polarization beam splitter
  • the first tapered lightpipe 102 is optically coupled to a first input port 112 of the PBS 110 , which may be a PBS having a multilayer birefringent structure (e.g. a VikuitiTM PBS, as provided by 3M, Corp.), a dielectric PBS, or the like.
  • a second tapered lightpipe 106 is optically coupled to a second input port 114 of the PBS 110 .
  • First light source G 104 and second light source G′ 108 may be provided by surface emitting color sources such as light emitting diodes (LEDs).
  • Light sources 104 , 108 are optically coupled to input ports of respective tapered lightpipes 102 , 106 .
  • a polarization rotation element 120 may be provided by a halfwave plate (HWP), located at a first output port 116 of the PBS 110 .
  • Polarization rotation element 120 serves to transform the state of polarization from p-polarized light to s-polarized light, and vice versa.
  • polarization rotation element 120 may be provided by a film.
  • a reflecting element 122 may be optically coupled to the polarization rotation element 120
  • an output lightpipe 124 may be optically coupled to the second output port 118 of the PBS 110 and the reflecting element 122 to collect light therefrom.
  • the polarization rotation element 120 is located between the output port 116 and reflecting element 122 , in other embodiments it could instead be located between the reflecting element 122 and the output lightpipe 124 .
  • the G′/G ColorSelect filter 126 is located in the lightpath of exiting light from output lightpipe 124 .
  • G′/G ColorSelect® filter 126 is used as an exemplary filter for colors G and G′, as output by light sources 104 and 108 respectively.
  • ColorSelect filters are manufactured by ColorLink, Inc., located in Boulder, Colo., and utilize retarder stacks to rotate the state of polarization of an additive color band (e.g., color G) by 90°, while the complementary color band (e.g., color G′) retains the input state of polarization.
  • Examples of G′/G configurations include but are not limited to Green/Magenta, Red/Cyan, and Blue/Yellow.
  • a linear cleanup polarizer (not shown) may also be located in the light path following the G′/G ColorSelect® filter 126 to provide more uniform polarized output light.
  • Lenses 128 and 130 may be configured as a telecentric relay system to direct output light to an LCOS, DLP, or LCD modulating panel 132 . It should be appreciated that other embodiments, some of which are provided herein, may provide alternative imaging or relay optical networks to direct light toward panel 132 .
  • light from distinctly different surface emitting color sources 104 and 108 (labeled G and G′ in this case; note their spectral regions may overlap in some embodiments) is collected and transmitted toward the first and second input ports ( 112 and 114 ) of the PBS 110 .
  • s-polarized light from each source 104 and 108 is reflected by the PBS 110 , while p-polarized light is transmitted.
  • the G′ p-polarized light 138 and G s-polarized light 140 propagates toward the polarization rotation element 120 at the first output port 116 , where they are both rotated 90 degrees to s-polarized and p-polarized light respectively.
  • Reflecting element 122 then reflects the light from the polarization rotation element 120 toward lightpipe 124 .
  • G p-polarized light 134 and G′ s-polarized light 136 propagates toward the second output port 118 .
  • all G light enters the output lightpipe with p-polarization and all G′ light enters with s-polarized light.
  • the output lightpipe may homogenize the spatial distribution of both G and G′ light independently (with some loss in polarization purity), and effectively eliminates the edge effect that may be caused by a HWP 120 .
  • the G and G′ light then passes through a G′/G ColorSelect filter 126 , which rotates the G′ light 90 degrees and does not rotate the G light.
  • the output is a uniform mixture of p-polarized G and G′ light that can be imaged with relay optics to a panel.
  • a linear polarizer (not shown) may be placed after the ColorSelect filter for polarization cleanup. Outputting light with one common polarization may be particularly useful for applications that utilize liquid crystal panels to modulate light, but may be less desirable for projection applications utilizing micromirrors to modulate light (i.e., DLP techniques).
  • FIG. 2 provides a graph 150 illustrating angular intensity distribution in the far field for exemplary high-power red, green, and blue LED devices (in this case, from Luminus Devices). From the graph 150 , it may be observed that the intensity of each of the red, green, and blue devices is not uniform with angle. Furthermore, the red device (as shown by line 152 ) has a nearly Lambertian normalized intensity profile, while the blue and green devices (shown by line 154 ) have a more peaked normalized intensity profile.
  • FIGS. 3A and 3B illustrate two techniques for reducing étendue at LEDs 160 and 170 respectively.
  • the first technique involves varying the aperture 164 at the die 162 . Since the die 162 can be thought of as a surface with an infinite number of point emitters, a reduction in die area produces a proportional reduction in luminous output.
  • the second technique for reducing étendue as illustrated by LED 170 in FIG. 3B , involves varying collected angular output.
  • the second technique may result in a lower loss in luminous output for ‘peaked’ green and blue die.
  • FIG. 4 is a schematic diagram showing a three-dimensional view of an exemplary tapered lightpipe 180 .
  • the tapered lightpipe 180 provides an angle-to-angle transformer intended to reduce the collected angular distribution from an LED source with non-uniform angular output, while maintaining a high transfer efficiency.
  • tapered lightpipe 180 has a light source input end 182 and a light source output end 184 .
  • the lightpipe 180 has a dual taper in the y-z plane, such that the first and second tapered stages 186 and 188 decrease in cross-sectional area along an axis normal to the cross-sectional plane (z axis), with the first tapered stage 186 decreasing in cross-sectional area per unit length at a greater rate than the second tapered stage 188 decreases.
  • lightpipe 180 transforms LED output angles up to 53 degrees to output angles of 23 degrees or less.
  • the lightpipe is not tapered (although it could be in other embodiments), and LED output angle of 23 degrees or less are output into a cone of 23 degrees or less. These angles were selected such that substantially all of the die face could emit light into the collection system, and the output of the lightpipe 180 would match the étendue of a selected panel.
  • the tapered light pipe 180 collects 1.5 to 1.75 times more light into the desired étendue than if an étendue-reducing aperture were placed at the die face.
  • the angle-to-angle transformer can also be implemented with a tapered lightpipe/tunnel and CPC for higher efficiency. A lens at the output of the angle-to-angle transformer may further increase efficiency.
  • FIG. 5A is a schematic diagram showing a top view of the exemplary tapered lightpipe 180 of FIG. 4 . From this view, it can be seen that the exemplary tapered lightpipe 180 is not tapered in the x-z plane. Although an exemplary tapered lightpipe is herein disclosed that is tapered in one dimension and not another, in other embodiments, the lightpipe may be tapered in other combinations of dimensions. For example, there may be a taper in the x-z plane.
  • FIG. 5B is a schematic diagram showing a side view of the exemplary lightpipe 180 of FIG. 4 .
  • FIGS. 6A-6D depict cross-sectional illuminance plots 200 , 210 , 220 , 230 through the output lightpipe 124 (of FIG. 1 ) as a function of position along the optical axis.
  • the light in the lightpipe 124 has been properly scaled for losses that are expected to be incurred during passage through the PBS and reflecting element (right angle prism structure).
  • FIG. 6A illustrates that at a 0 mm position along the optical axis (i.e., at the input of the output lightpipe 124 ), a shaded area 202 is evident where the half-wave plate is located between the PBS and reflecting element.
  • FIG. 6B and 6C show that further into the output lightpipe, for instance at 2 mm and 10 mm from the input face in the direction of the optic axis, the HWP shading is reduced, but light pooling is apparent along two edges (e.g., shown by shaded areas 212 , 214 in FIG. 6B , and shaded areas 222 , 224 in FIG. 6C ).
  • FIG. 6D shows that at approximately 18 mm from the input of the output lightpipe, the light is homogenized sufficiently for use in projection applications.
  • the output lightpipe may alternatively be implemented as a dual tapered lightpipe or tapered lightpipe with a compound parabolic concentrator (CPC) for the purpose of implementing lower f-number relay optics.
  • CPC compound parabolic concentrator
  • a lens at the output of the angle-to-angle transformer may further increase efficiency.
  • FIG. 7 illustrates a second exemplary embodiment of a light collection system 250 , including light collection module 260 and homogenizing optical module 270 .
  • Light collection module 260 receives light from first and second light sources 252 , 254 , and may have similar structure, and may operate in much the same way as elements 102 - 122 of FIG. 1 .
  • Homogenizing optical module 270 generally provides homogenizing optics, and includes first lens array 272 and second lens array 274 (each with two or more lenslets) and a condenser lens 276 .
  • the images of each lenslet in the first lens array 272 may be imaged by the second lens array 274 and condenser 276 at the illumination plane 278 .
  • the overlapping images provide substantially uniform light at the illumination plane 278 .
  • a ColorSelect filter 280 may be placed in the lens train to rotate all of the light to one common polarization.
  • the ColorSelect filter 280 can be substituted for an LC cell (a switchable half-wave rotator) to provide output light with a common polarization.
  • LC cell a switchable half-wave rotator
  • FIG. 8 illustrates a third exemplary embodiment of a light collection system 300 , including light collection module 310 and homogenizing optical module 320 .
  • the structure and function of light collection module 310 is similar to that shown by the first embodiment described with reference to FIG. 1 .
  • homogenizing optical module 320 provides a first lens array 322 attached to the face of the prism assembly 312 and also attached to output port of PBS 314 with low index adhesive to optimize total internal reflection (TIR) of light.
  • First lens array 322 in conjunction with second lens array 324 and condenser lens 326 directs light toward illumination plane 328 .
  • a ColorSelect element 330 may be placed in the lens train to rotate all of the light to one common polarization.
  • this embodiment may provide the advantage of higher polarization purity at the output compared to the lightpipe homogenizing optic 124 shown in FIG. 1 .
  • the ColorSelect filter 330 can be substituted for an LC cell (a switchable half-wave rotator) to provide output light with a common polarization.
  • LC cell a switchable half-wave rotator
  • FIG. 9 illustrates a fourth exemplary embodiment of a light collection system 350 , including light collection module 360 and homogenizing optical module 370 .
  • the structure and function of light collection module 360 is similar to that shown by the first embodiment described with reference to FIG. 1 .
  • the homogenizing optical module 370 includes a condenser lens 372 and lightpipe 374 (or similar non-imaging collector such as a light tunnel, solid Compound Parabolic Concentrator (CPC), hollow CPC, solid angle-angle transformer, or hollow angle-angle transformer) acting as the homogenizing optic.
  • CPC Solid Compound Parabolic Concentrator
  • light collection module 360 receives light from first and second light sources 352 , 354 , and directs light toward PBS output port 362 and prism output port 364 , in a similar manner to the embodiment described in FIG. 1 .
  • the condenser lens 372 directs light from the output of the light collection module 360 to the input of the non-imaging collector 370 , where the light is homogenized.
  • the angular distribution of the illumination may be tailored to match a desired relay lens numerical aperture by tapering or shaping the non-imaging collector 374 .
  • the condenser lens 372 is shown with an air gap between the lens and prism assembly.
  • the condenser lens 372 may alternatively be optically coupled to the prism assembly with low index adhesive.
  • the ColorSelect filter 380 can be substituted for an LC cell (a switchable half-wave rotator) to provide output light with a common polarization. Such an exemplary embodiment is described in FIG. 14 , however, the switching technique described for that embodiment may be used with this architecture also.
  • FIG. 10 illustrates a fifth exemplary embodiment of a light collection system 400 configured to receive light from first and second light sources 402 , 404 , including light collection module 410 and homogenizing optical module 420 .
  • the structure and function of light collection module 410 is similar to that shown by the first embodiment described with reference to FIG. 1 .
  • Homogenizing optical module 420 includes a condenser lens 422 and field lens 424 .
  • the field lens 422 functions to create a telecentric source at the illumination plane 428 .
  • system 400 may utilize several lenses for the condenser lens 422 and field lens 424 , respectively.
  • light collection system 400 may provide a potentially higher polarization purity than a lightpipe or light tunnel-based system.
  • the condenser lens 422 may be optically coupled light collection module 410 with low index adhesive.
  • the ColorSelect filter 430 can be substituted for an LC cell (a switchable half-wave rotator) to provide output light with a common polarization. Such an exemplary embodiment is described in FIG. 14 , however, the switching technique described for that embodiment may be used with this architecture also.
  • FIG. 11 illustrates a sixth exemplary embodiment of a light collection system 450 , providing an alternative architecture.
  • Light collection system 450 includes first and second light collectors 456 , 458 operable to receive light from first and second light sources 452 , 454 .
  • Light collection system 450 further includes first and second quarter wave plates (QWP) 460 , 462 located between first and second light collectors 456 , 458 and first and second input ports 464 , 466 of PBS 470 .
  • QWP quarter wave plates
  • a flat mirror 472 is located at port 474 of PBS 470 .
  • a ColorSelect element may be located in the output light path transmitted via output port 476 to provide output light with one common polarization.
  • the ColorSelect filter 480 can be substituted for an LC cell (a switchable half-wave rotator) to provide output light with a common polarization.
  • LC cell a switchable half-wave rotator
  • randomly-polarized light (G) emitted by first light source 452 is transmitted to the QWP 460 and PBS 470 via the first light collector 456 .
  • s-polarized light is reflected toward the PBS output port 476
  • p-polarized light is transmitted toward the mirror 472 .
  • the p-polarized light reflects from the mirror 472 , passes through the PBS surface 465 , and passes through QWP 460 , which transforms the light to a circularly-polarized state.
  • the circular-polarized light reflects again at the surface 453 of the LED 452 (surface reflectivity 25 %), changes handedness, and passes again through the QWP 460 .
  • this light After passing through the QWP 460 , this light is now s-polarized, and reflects from the PBS surface 465 toward the PBS output port 476 . Illumination from the second light source 452 (G′ LED) follows a similar path/recycling, except the s-polarized light is recycled while the p-polarized light is directly transmitted.
  • the first and second light collectors 456 , 458 and PBS 470 can be sized to capture the full panel étendue (compared to half the panel étendue in the previous architectures of FIGS. 1 , 7 - 10 ). Additionally, the output of the PBS 470 may be directly imaged to the modulating panel since there are no seams in the output face. Finally, polarization purity at the output face 476 of the PBS 470 should be very good.
  • FIG. 12 illustrates a seventh exemplary embodiment of a light collection system 500 .
  • This system 500 has a similar architecture to that shown in FIG. 11 , except a lightpipe 502 (or other non-imaging collector such as a light tunnel, solid or hollow CPC, or lens array and condenser) has been added at the output for homogenizing the illumination.
  • the lightpipe 502 or equivalent, may be attached with low index adhesive.
  • FIG. 13 illustrates an eighth exemplary embodiment of a light collection system 550 .
  • This exemplary architecture uses first and second polarizing beamsplitters in orthogonal orientations, where a first PBS 552 reflects s-polarized light and a second PBS 554 reflects p-polarized light.
  • Dual Brightness Enhancement Film (DBEF, from 3M Corp.) is capable of this type of operation.
  • randomly polarized light from first light source (G′ LED) 556 transmits to the first PBS layer 560 , where the s-polarized light 561 is reflected to the output 562 and the p-polarized light 563 is transmitted.
  • the p-polarized light 563 then reflects at the second PBS layer 566 , and is converted to circularly-polarized light after passing through the QWP 568 .
  • the circularly-polarized light changes handedness at the mirror 570 , and is converted to s-polarized light after passing through the QWP 568 again.
  • the s-polarized light then transmits through the PBS to the output 562 .
  • a lightpipe 572 (or other homogenizing optical structure) is included at the output 562 to provide uniform illumination.
  • the lightpipe 572 may also be attached with low index adhesive. Randomly polarized light from second light source (G LED) 558 is processed in much the same way as that from the first light source, except p-polarized light is reflected at the second PBS layer 566 to the output 562 and the s-polarized light is transmitted.
  • a ColorSelect element may be located in the output light path to provide output light with one common polarization.
  • the ColorSelect filter 574 can be substituted for an LC cell (a switchable half-wave rotator) to provide output light with a common polarization. Such an exemplary embodiment is described in FIG. 14 , however, the switching technique described for that embodiment may be used with this architecture also.
  • the instantaneous light flux output by a light emitting diode is nearly linearly dependent on the instantaneous current input to the device.
  • LED's can be driven with continuous wave (CW) currents, or can be pulsed with higher peak currents when the current is modulated over short periods of time (fractions of a second).
  • LED manufacturers provide maximum pulsed and CW current limits for their products which produce device lifetimes (usually 20,000-100,000 hours) that are similar for either drive method.
  • the average light flux produced by an LED that is pulsed at the manufacturer's limit pulse current over a long period of time is not greater than the average light flux produced by an LED driven with the manufacturer's limit CW current. For a single LED, this implies the brightest light output will generally be seen with a CW driven LED.
  • FIG. 14 illustrates a variation of a non-imaging light collection system (compared to the various embodiments of FIGS. 1-13 ) that approximately doubles the brightness of the same system when compared to a single color LED input.
  • the structure of light collection system 600 is similar to the light collection system 100 of FIG. 1 , with a few modifications.
  • first and second light sources (LEDs) 602 , 604 are of the same color (or similar color)
  • the ColorSelect filter shown in FIG. 1 is replaced with a switchable half-wave rotator (e.g., a liquid crystal cell) and analyzer 606 .
  • a switchable half-wave rotator e.g., a liquid crystal cell
  • FIGS. 1-13 show, among other things, that the use of two substantially distinct colors (or spectral distributions) at the inputs of the light collectors and a ColorSelect device at the output, produce a brighter light source. If the LEDs are replaced with LEDs of the same color (or similar color) 602 , 604 , and the ColorSelect filter is replaced with a switchable half-wave rotator (e.g., a liquid crystal cell) and analyzer 606 , light from either light source 602 , 604 can be selected at the output based on the driven phase of the half wave rotator 606 .
  • a switchable half-wave rotator e.g., a liquid crystal cell
  • the average light flux out of the illuminator can be approximately twice the CW output of a single LED source.
  • the same system can be applied to sources that are spectrally separated by an amount less than the sum of half the bandwidths of each source. For example, a bluish green LED might be combined with a yellowish green LED to produce a bright green source in a 2D display. The same illuminator could then be combined with a higher frame rate display for displaying two images in spectral-division 3D applications.
  • the light collection systems described herein may be implemented as a monolithic glass, plastic, or combination glass/plastic assembly.
  • Total internal reflection (TIR) is required at several faces of the PBS and right angle prism to maintain étendue and efficiency as light travels through the structure.
  • dielectric layers on the glass surfaces may allow lower index glass or plastic to be used with glue to maintain the TIR.
  • the monolithic assembly provides advantages in robustness, alignment, and potentially cost if components can be molded from plastic.
  • the tapered lightpipes of FIG. 1 may be utilized to interface LED sources with the color combining and polarization splitting architectures described in U.S. Pub. App. No. 2006/0007538 A1, by M. G. Robinson, entitled “Illumination Systems,” filed Jul. 6, 2005, which is hereby incorporated by reference.
  • the output lightpipes may be used to direct light from the output ports of the PBSs/mirrors shown in 2006/0007538 in accordance with the teachings of this disclosure, in order to homogenize output light.
  • the teachings of this disclosure and 2006/0007538 may be combined to provide various light collection systems for projection systems.
  • the term “projection system” refers to a display that projects an image onto a screen, including rear-projection systems and front-projection systems.
  • optically coupled refers to the coupling of optical components to provide a light path and light transmission from one component to another.
  • Optical components may be integrated with other optical components into a single, monolithic glass, plastic or combination glass/plastic assembly, yet functionally those optical components may still be “optically coupled.”
  • Optical coupling may include direct or indirect contact between components, and may or may not include the use of index-matching material, including but not limited to index matching adhesive to couple components together.
  • components may be optically coupled when they are touching, when they are integrated as a single assembly, when there is a translucent object between components, and/or when there is a gap between them, provided that a light path is provided between one component and another.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Projection Apparatus (AREA)
  • Led Device Packages (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
US11/779,706 2006-07-18 2007-07-18 Light collectors for projection systems Abandoned US20080018861A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/779,706 US20080018861A1 (en) 2006-07-18 2007-07-18 Light collectors for projection systems

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US80770406P 2006-07-18 2006-07-18
US82949506P 2006-10-13 2006-10-13
US86241406P 2006-10-20 2006-10-20
US11/779,706 US20080018861A1 (en) 2006-07-18 2007-07-18 Light collectors for projection systems

Publications (1)

Publication Number Publication Date
US20080018861A1 true US20080018861A1 (en) 2008-01-24

Family

ID=38957596

Family Applications (3)

Application Number Title Priority Date Filing Date
US11/779,706 Abandoned US20080018861A1 (en) 2006-07-18 2007-07-18 Light collectors for projection systems
US11/779,711 Active US7542206B2 (en) 2006-07-18 2007-07-18 Light collectors for projection systems
US11/779,704 Expired - Fee Related US7982954B2 (en) 2006-07-18 2007-07-18 Light collectors for projection systems

Family Applications After (2)

Application Number Title Priority Date Filing Date
US11/779,711 Active US7542206B2 (en) 2006-07-18 2007-07-18 Light collectors for projection systems
US11/779,704 Expired - Fee Related US7982954B2 (en) 2006-07-18 2007-07-18 Light collectors for projection systems

Country Status (5)

Country Link
US (3) US20080018861A1 (enExample)
EP (1) EP1955107B1 (enExample)
JP (1) JP5378211B2 (enExample)
AT (1) ATE546751T1 (enExample)
WO (1) WO2008011480A2 (enExample)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090190101A1 (en) * 2008-01-28 2009-07-30 International Business Machines Corporation Double-Reverse Total-Internal-Reflection-Prism Optical Engine
US20090316114A1 (en) * 2008-06-18 2009-12-24 Dolby Laboratories Licensing Corporation Method and apparatus for light recapture and sequential channel illumination
US20100033563A1 (en) * 2008-08-05 2010-02-11 Perceptron, Inc. Light Pipe For Imaging Head of Video Inspection Device
US20100182572A1 (en) * 2009-01-19 2010-07-22 Herb He Huang polarizer assembly and a reflective modulation-imager projection system
WO2010059684A3 (en) * 2008-11-19 2010-08-19 3M Innovative Properties Company Polarization converting color combiner
US20100277796A1 (en) * 2007-12-28 2010-11-04 Simon Magarill Light combiner
US20100328561A1 (en) * 2009-06-29 2010-12-30 Reald Inc. Stereoscopic projection system employing spatial multiplexing at an intermediate image plane
US20110007392A1 (en) * 2007-12-28 2011-01-13 English Jr Ronald E Light combiner
US20110149547A1 (en) * 2008-05-15 2011-06-23 Bruzzone Charles L Optical element and color combiner
US20110216396A1 (en) * 2008-11-19 2011-09-08 Ouderkirk Andrew J High durability color combiner
US20120008096A1 (en) * 2008-05-15 2012-01-12 Simon Magarill Optical element and color combiner
CN102621791A (zh) * 2012-04-20 2012-08-01 杭州研明光电技术有限公司 混合光源液晶投影光引擎系统
US8654444B2 (en) 2008-11-19 2014-02-18 3M Innovative Properties Company Polarization converting color combiner
US20150138511A1 (en) * 2013-11-20 2015-05-21 Christie Digital Systems Canada Inc. System for uniform distribution of light
WO2015200395A1 (en) * 2014-06-26 2015-12-30 Commscope, Inc. Of North Carolina Optical tap
US20180066828A1 (en) * 2016-09-06 2018-03-08 Seiko Epson Corporation Illuminator and projector
US20190219912A1 (en) * 2018-01-16 2019-07-18 Seiko Epson Corporation Illuminator and projector
US12137306B2 (en) 2019-12-04 2024-11-05 Magic Leap, Inc. Variable-pitch color emitting display

Families Citing this family (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4825203B2 (ja) * 2004-07-06 2011-11-30 リアルディー インコーポレイテッド 偏光状態を制御可能な照明システム、方法
JP2007322584A (ja) * 2006-05-31 2007-12-13 Sanyo Electric Co Ltd 照明装置及びそれを用いた投写型映像表示装置
US20080018861A1 (en) * 2006-07-18 2008-01-24 Colorlink, Inc. Light collectors for projection systems
US20080231953A1 (en) * 2007-03-22 2008-09-25 Young Garrett J System and Method for LED Polarization Recycling
US7821713B2 (en) * 2007-05-18 2010-10-26 3M Innovative Properties Company Color light combining system for optical projector
TWI372304B (en) * 2008-02-12 2012-09-11 Young Optics Inc Polarization conversion system and illumination module
RU2502918C2 (ru) * 2008-06-10 2013-12-27 Конинклейке Филипс Электроникс Н.В. Светоизлучающее устройство и способ излучения света
USD624952S1 (en) 2008-10-20 2010-10-05 X6D Ltd. 3D glasses
USRE45394E1 (en) 2008-10-20 2015-03-03 X6D Limited 3D glasses
USD603445S1 (en) 2009-03-13 2009-11-03 X6D Limited 3D glasses
USD666663S1 (en) 2008-10-20 2012-09-04 X6D Limited 3D glasses
CA2684513A1 (en) 2008-11-17 2010-05-17 X6D Limited Improved performance 3d glasses
US8542326B2 (en) 2008-11-17 2013-09-24 X6D Limited 3D shutter glasses for use with LCD displays
US20100245999A1 (en) * 2009-03-30 2010-09-30 Carlow Richard A Cart For 3D Glasses
USD646451S1 (en) 2009-03-30 2011-10-04 X6D Limited Cart for 3D glasses
USD672804S1 (en) 2009-05-13 2012-12-18 X6D Limited 3D glasses
USD650956S1 (en) 2009-05-13 2011-12-20 X6D Limited Cart for 3D glasses
USD671590S1 (en) 2010-09-10 2012-11-27 X6D Limited 3D glasses
USD669522S1 (en) 2010-08-27 2012-10-23 X6D Limited 3D glasses
USD692941S1 (en) 2009-11-16 2013-11-05 X6D Limited 3D glasses
USD662965S1 (en) 2010-02-04 2012-07-03 X6D Limited 3D glasses
USD664183S1 (en) 2010-08-27 2012-07-24 X6D Limited 3D glasses
TWI418918B (zh) * 2010-11-19 2013-12-11 Wintek Corp 照明模組及投影裝置
CN102231042B (zh) * 2011-06-22 2013-05-01 贺银波 用于反射式液晶投影显示的光引擎系统
US8869784B2 (en) * 2011-06-24 2014-10-28 Truglo, Inc. Illuminated sighting device with removable optical fibers
TW201327012A (zh) * 2011-12-22 2013-07-01 Min Aik Technology Co Ltd 反射式液晶投影系統
DE102012200407A1 (de) * 2012-01-12 2013-07-18 Osram Gmbh Projektionsvorrichtung und Verfahren zum Betreiben einer Projektionsvorrichtung
US9325977B2 (en) 2012-01-25 2016-04-26 International Business Machines Corporation Three dimensional LCD monitor display
US8992024B2 (en) 2012-01-25 2015-03-31 International Business Machines Corporation Three dimensional image projector with circular light polarization
US8985785B2 (en) 2012-01-25 2015-03-24 International Business Machines Corporation Three dimensional laser image projector
US8960913B2 (en) 2012-01-25 2015-02-24 International Busniess Machines Corporation Three dimensional image projector with two color imaging
US9004700B2 (en) 2012-01-25 2015-04-14 International Business Machines Corporation Three dimensional image projector stabilization circuit
US20130188149A1 (en) 2012-01-25 2013-07-25 International Business Machines Corporation Three dimensional image projector
US9104048B2 (en) 2012-01-25 2015-08-11 International Business Machines Corporation Three dimensional image projector with single modulator
CN104136837B (zh) * 2012-03-12 2017-10-13 3M创新有限公司 光导管均化器
USD711959S1 (en) 2012-08-10 2014-08-26 X6D Limited Glasses for amblyopia treatment
FR2999274A1 (fr) * 2012-12-07 2014-06-13 Maquet Sas Dispositif d'eclairage a leds pour champs operatoire comprenant un diviseur de faisceaux de lumiere
FR3005339A1 (fr) * 2013-05-03 2014-11-07 Maquet Sas Dispositif d'eclairage pour former une tache d'eclairement a diametre et temperature de couleur variables
CN103472620B (zh) * 2013-09-13 2016-03-16 合肥京东方光电科技有限公司 一种双屏幕显示装置
JP5679079B2 (ja) * 2014-03-03 2015-03-04 セイコーエプソン株式会社 照明装置及びプロジェクター
US9971135B2 (en) 2014-05-10 2018-05-15 Innovations In Optics, Inc. Light emitting diode digital micromirror device illuminator
EP3435132A3 (en) * 2014-05-10 2019-04-17 Innovations in Optics, Inc. Light emitting diode digital micromirror device illuminator
FR3037121B1 (fr) * 2015-06-02 2017-06-16 Maquet Sas Dispositif d'eclairage a coupole d'eclairage d'encombrement reduit pour former une tache d'eclairement a diametre et temperature de couleur variables
US20170229803A1 (en) * 2016-02-08 2017-08-10 David L. Putnam Methods and devices that facilitate object orientation
CN111522187B (zh) * 2019-02-01 2022-07-22 杭天创新科技有限公司 一种彩色投影装置

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5223975A (en) * 1988-11-11 1993-06-29 Fujitsu Limited Polarization beam coupler including a splitter for producing an output monitor beam
US5382790A (en) * 1990-07-24 1995-01-17 Deutsche Thomson-Brandt Gmbh Illumination device having beam splitting polarization means
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
US6132047A (en) * 1998-02-18 2000-10-17 Seiko Epson Corporation Polarized light illumination device and projector
US6384972B1 (en) * 2001-06-13 2002-05-07 Prokia Technology Co., Ltd. Projection display with three polarization beam splitter prisms
US6726329B2 (en) * 2001-12-20 2004-04-27 Delta Electronics Inc. Image projection device with an integrated photodiode light source
US6937377B1 (en) * 2003-11-12 2005-08-30 Rockwell Collins Dual lamp projection system
US20050200812A1 (en) * 2004-03-10 2005-09-15 Seiko Epson Corporation Illuminating apparatus, image display apparatus, and projector
US20050259224A1 (en) * 2004-05-22 2005-11-24 Young-Chol Lee Projection display
US20060007538A1 (en) * 2004-07-06 2006-01-12 Colorlink Inc. Illumination Systems
US7325957B2 (en) * 2005-01-25 2008-02-05 Jabil Circuit, Inc. Polarized light emitting diode (LED) color illumination system and method for providing same

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2598574B1 (fr) * 1986-05-06 1992-02-28 Matra Procede et dispositif optiques de transmission de donnees a multiplexage de frequence
JP2000056266A (ja) * 1998-08-11 2000-02-25 Sony Corp 光学装置
US6587269B2 (en) * 2000-08-24 2003-07-01 Cogent Light Technologies Inc. Polarization recovery system for projection displays
JP2002250918A (ja) * 2001-02-26 2002-09-06 Nikon Corp 投射型表示装置
JP2003330109A (ja) * 2002-05-09 2003-11-19 Seiko Epson Corp 照明装置および投射型表示装置
TWI235263B (en) * 2002-05-14 2005-07-01 Sony Corp Illuminating optical system, image display unit and method of illuminating space modulation element
JP2004053655A (ja) * 2002-07-16 2004-02-19 Tamron Co Ltd 偏光光学系及び投影装置
DE60319268T2 (de) * 2002-11-21 2009-02-12 Cousins Distributing, Inc., Suisun Gerät zum füllen einer zigarettenhülse mit einer abgemessenen menge tabak
JP2005070443A (ja) * 2003-08-25 2005-03-17 Olympus Corp 光学装置、照明装置及びプロジェクタ
JP2007528514A (ja) 2004-03-09 2007-10-11 トムソン ライセンシング 偏光システムへ赤色光を追加する装置
KR101074984B1 (ko) * 2004-03-11 2011-10-18 톰슨 라이센싱 복수 램프 조사 시스템
JP2006017801A (ja) * 2004-06-30 2006-01-19 Olympus Corp 光源装置及び画像投影装置
JP4860124B2 (ja) * 2004-07-23 2012-01-25 シャープ株式会社 投射型表示装置
US20080018861A1 (en) * 2006-07-18 2008-01-24 Colorlink, Inc. Light collectors for projection systems

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5223975A (en) * 1988-11-11 1993-06-29 Fujitsu Limited Polarization beam coupler including a splitter for producing an output monitor beam
US5382790A (en) * 1990-07-24 1995-01-17 Deutsche Thomson-Brandt Gmbh Illumination device having beam splitting polarization means
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
US6132047A (en) * 1998-02-18 2000-10-17 Seiko Epson Corporation Polarized light illumination device and projector
US6384972B1 (en) * 2001-06-13 2002-05-07 Prokia Technology Co., Ltd. Projection display with three polarization beam splitter prisms
US6726329B2 (en) * 2001-12-20 2004-04-27 Delta Electronics Inc. Image projection device with an integrated photodiode light source
US6937377B1 (en) * 2003-11-12 2005-08-30 Rockwell Collins Dual lamp projection system
US20050200812A1 (en) * 2004-03-10 2005-09-15 Seiko Epson Corporation Illuminating apparatus, image display apparatus, and projector
US20050259224A1 (en) * 2004-05-22 2005-11-24 Young-Chol Lee Projection display
US20060007538A1 (en) * 2004-07-06 2006-01-12 Colorlink Inc. Illumination Systems
US7325957B2 (en) * 2005-01-25 2008-02-05 Jabil Circuit, Inc. Polarized light emitting diode (LED) color illumination system and method for providing same

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100277796A1 (en) * 2007-12-28 2010-11-04 Simon Magarill Light combiner
US20110007392A1 (en) * 2007-12-28 2011-01-13 English Jr Ronald E Light combiner
US20090190101A1 (en) * 2008-01-28 2009-07-30 International Business Machines Corporation Double-Reverse Total-Internal-Reflection-Prism Optical Engine
US20120008096A1 (en) * 2008-05-15 2012-01-12 Simon Magarill Optical element and color combiner
US8485667B2 (en) * 2008-05-15 2013-07-16 3M Innovative Properties Company Optical element and colored light combiner using same
US20110149547A1 (en) * 2008-05-15 2011-06-23 Bruzzone Charles L Optical element and color combiner
US20090316114A1 (en) * 2008-06-18 2009-12-24 Dolby Laboratories Licensing Corporation Method and apparatus for light recapture and sequential channel illumination
US8480234B2 (en) * 2008-06-18 2013-07-09 Dolby Laboratories Licensing Corporation Method and apparatus for light recapture and sequential channel illumination
US8760507B2 (en) 2008-08-05 2014-06-24 Inspectron, Inc. Light pipe for imaging head of video inspection device
US20100033563A1 (en) * 2008-08-05 2010-02-11 Perceptron, Inc. Light Pipe For Imaging Head of Video Inspection Device
US20110216396A1 (en) * 2008-11-19 2011-09-08 Ouderkirk Andrew J High durability color combiner
US20110235175A1 (en) * 2008-11-19 2011-09-29 Yarn Chee Poon Polarization converting color combiner
US8542441B2 (en) 2008-11-19 2013-09-24 3M Innovative Properties Company High durability color combiner
US8654444B2 (en) 2008-11-19 2014-02-18 3M Innovative Properties Company Polarization converting color combiner
WO2010059684A3 (en) * 2008-11-19 2010-08-19 3M Innovative Properties Company Polarization converting color combiner
WO2010059681A3 (en) * 2008-11-19 2010-08-19 3M Innovative Properties Company Color combiner
US20100182572A1 (en) * 2009-01-19 2010-07-22 Herb He Huang polarizer assembly and a reflective modulation-imager projection system
US8403488B2 (en) * 2009-06-29 2013-03-26 Reald Inc. Stereoscopic projection system employing spatial multiplexing at an intermediate image plane
US20100328561A1 (en) * 2009-06-29 2010-12-30 Reald Inc. Stereoscopic projection system employing spatial multiplexing at an intermediate image plane
US8794764B2 (en) 2009-06-29 2014-08-05 Reald Inc. Stereoscopic projection system employing spatial multiplexing at an intermediate image plane
CN102621791A (zh) * 2012-04-20 2012-08-01 杭州研明光电技术有限公司 混合光源液晶投影光引擎系统
US9335612B2 (en) * 2013-11-20 2016-05-10 Christie Digital Systems Usa, Inc. System for uniform distribution of light using an array of lenslets
US20150138511A1 (en) * 2013-11-20 2015-05-21 Christie Digital Systems Canada Inc. System for uniform distribution of light
CN106537203A (zh) * 2014-06-26 2017-03-22 美国北卡罗来纳康普公司 光学抽头
WO2015200395A1 (en) * 2014-06-26 2015-12-30 Commscope, Inc. Of North Carolina Optical tap
US9696495B2 (en) 2014-06-26 2017-07-04 Commscope, Inc. Of North Carolina Optical tap
US20180066828A1 (en) * 2016-09-06 2018-03-08 Seiko Epson Corporation Illuminator and projector
US10060602B2 (en) * 2016-09-06 2018-08-28 Seiko Epson Corporation Illuminator and projector
US20190219912A1 (en) * 2018-01-16 2019-07-18 Seiko Epson Corporation Illuminator and projector
US10877364B2 (en) * 2018-01-16 2020-12-29 Seiko Epson Corporation Illuminator and projector
US12137306B2 (en) 2019-12-04 2024-11-05 Magic Leap, Inc. Variable-pitch color emitting display

Also Published As

Publication number Publication date
WO2008011480A3 (en) 2009-03-19
EP1955107A4 (en) 2011-01-26
US7982954B2 (en) 2011-07-19
US7542206B2 (en) 2009-06-02
US20080174868A1 (en) 2008-07-24
US20080018999A1 (en) 2008-01-24
ATE546751T1 (de) 2012-03-15
JP5378211B2 (ja) 2013-12-25
WO2008011480A2 (en) 2008-01-24
JP2009544063A (ja) 2009-12-10
EP1955107B1 (en) 2012-02-22
EP1955107A2 (en) 2008-08-13

Similar Documents

Publication Publication Date Title
US7542206B2 (en) Light collectors for projection systems
TWI471603B (zh) 光學元件、色彩結合器、結合光之方法及影像投影機
CN100422850C (zh) 照明装置以及投影型显示装置
US7364302B2 (en) Projection display system using multiple light sources and polarizing element for using with same
CN102770794B (zh) 用于激光投影的照射系统
US20060164857A1 (en) LED polarizing optics for color illumination system and method of using same
US20060164607A1 (en) Light-emitting diode (LED) illumination system for a digital micro-mirror device (DMD) and method of providing same
US8425043B2 (en) Projector having a plurality of optical devices with a purality of optical modulators
US20130176540A1 (en) Light source module and projection apparatus
CN102084283A (zh) 光学元件和合色器
US20090310042A1 (en) Illumination system and method with efficient polarization recovery
US20130077283A1 (en) Apparatuses and methods for high-efficiency polarization conversion in a projection light engine
CN103890639A (zh) 倾斜的二向色偏振分束器
US9016865B2 (en) Illumination device and projection type display device using the same
CN102906626A (zh) 偏振投影照明器
CN101248384B (zh) 多光源光束扩展量的有效组合
US8998419B2 (en) Illuminating device and projection display device using the same
CN102498436B (zh) 照明设备和使用该照明设备的投影显示设备
US8708499B2 (en) Illuminating device and projection display device using the same
WO2022037196A1 (zh) 一种三色光源设备和投影显示设备
JP2007065412A (ja) 照明装置及び投写型映像表示装置
JP5105804B2 (ja) プロジェクタおよび投射方法
CN222838340U (zh) 一种合光组件、照明模块及光学设备
US20090147221A1 (en) Miniaturized projection display
WO2006081243A1 (en) Light-emitting diode (led) illumination system for a digital micro-mirror device (dmd) and method of providing same

Legal Events

Date Code Title Description
AS Assignment

Owner name: COLORLINK, INC., COLORADO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SCHUCK, MILLER H.;ROBINSON, MICHAEL G.;REEL/FRAME:019738/0850

Effective date: 20070817

AS Assignment

Owner name: REAL D, CALIFORNIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:COLORLINK, INC.;REEL/FRAME:020566/0818

Effective date: 20080227

Owner name: REAL D,CALIFORNIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:COLORLINK, INC.;REEL/FRAME:020566/0818

Effective date: 20080227

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION