CN203433207U - Polarization conversion system and projection system using polarized lights to code stereo image - Google Patents
Polarization conversion system and projection system using polarized lights to code stereo image Download PDFInfo
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- CN203433207U CN203433207U CN201320376780.0U CN201320376780U CN203433207U CN 203433207 U CN203433207 U CN 203433207U CN 201320376780 U CN201320376780 U CN 201320376780U CN 203433207 U CN203433207 U CN 203433207U
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Abstract
The utility model discloses a polarization conversion system and a projection system using polarized lights to code a stereo image. The polarization conversion system is placed on an output light path of a projector and comprises a polarization beam splitter, a polarization rotation component, a reflecting component and a polarization switch. Usually, the projector outputs random polarized lights. The lights are input into the polarization conversion system. In the polarization conversion system, the polarization conversion system separates a p polarized light and an s polarized light through the polarization beam splitter. The p polarized light is guided toward the polarization switch on a first light path. The s polarized light is transmitted, passes through the polarization rotation component (such as a half wave plate) on a second light path, and is converted into a p polarized light. The reflecting component faces the polarization switch and guides the converted polarized light (the p polarized light at the present) along the second light path. The first light path and the second light path are eventually guided toward a projection screen, so that a brighter screen image is jointly formed in the application of using the polarized lights to watch a three-dimensional film.
Description
Technical field
The utility model relates to a kind of optical projection system of carrying out three-dimensional viewing experience for projected image, and more specifically, the optical projection system that relates to a kind of polarization conversion system and utilize polarized light stereoscopic image to encode.
Background technology
Three-dimensional (3D) image can synthesize with Polarization Control and Polarization Control glasses after projector (referring to the U.S. Patent No. 4,792,850 of for example Lipton, this patent is incorporated to herein hereby by reference).
The conventional implementation of the Polarization Control at projector place is illustrated in Fig. 1.In this implementation, almost parallel light (ray) penetrates from the output of lens 10, seems to derive from the pupil 12 of lens 10 inside, and convergence forms hot spot on screen 14.Light shafts A, B in Fig. 1 and C are respectively the bundles that hot spot is formed on bottom, center and the top at screen 14.The light 20 penetrating from projecting lens is by polarization randomly, and [s polarized light is represented as " o " conventionally in Fig. 1, to be depicted as s polarized light and p polarized light; P polarized light represents with the line that end is double-head arrow].Light 20, through linear polarizer 22, causes single polarization state after polarizer 22.Orthogonal polarisation state is absorbed (or being reflected), and the luminous flux after polarizer 22 is less than original flux half conventionally, thereby causes dimmed final image.Polarization switch 30 is synchronizeed with picture frame, and the polarization state 24 penetrating from polarization switch alternately, produces the alternately image of cross polarization at screen place.Polarization selects glasses to allow a kind of image of polarization to pass to left eye, and the image of cross polarization passes to right eye.By every eyes are presented to different images, 3D image can be synthesized.
This conventional system is used in movie theatre.Yet this conventional system requires to be greater than 50% light and is polarized device and absorbs, and the image of the typical 2D movie theatre of gained image ratio is dark more than 50%.Darker image will limit for the size of the movie theatre of 3D application and/or for spectators not too gratifying viewing experience is provided.
Therefore, the optical projection system that a kind of polarization conversion system need to be provided and utilize polarized light stereoscopic image to encode, solves the problems referred to above.
Utility model content
Solve foregoing problems, from the various embodiments of projector reception polarisation of light converting system, be described.Polarization conversion system is utilizing polarized light to carry out presenting brighter screen picture in film applications that three-dimensional watches.
In embodiments, polarization conversion system comprises polarization beam apparatus, polarization rotator and polarization switch, polarization beam apparatus is provided to receive random polarization light beam from projection lenses, and be provided to have along the first light path guiding the first light beam of the first polarization state, and along the second light path guiding, there is the second light beam of the second polarization state; Polarization rotator is placed in the second light path, and described polarization rotator is provided to change the second polarization state into first polarization state; Polarization switch is provided to from the first light path and the second light path, receive the first light beam and the second light beam respectively, and is provided to optionally change the polarization state of the first light beam and the second light beam one of into the first output polarization state and second output polarization state.
Wherein, the first light beam transmits towards projection screen.Reflecting element can be placed in the second light path, to guide the second light beam towards projection screen so that the first light beam and the second light beam substantially overlapping (overlap) to form brighter screen picture.
The utility model also provides a kind of polarization conversion system, described polarization conversion system comprises polarization beam apparatus, polarization rotation element, reflector element, polarization switch, controller and shell, and polarization beam apparatus is provided to guide light in the first light path and the second light path and is provided to receive light from projector; Polarization rotation element is placed in the second light path; Reflector element is placed in the second light path; Polarization switch is placed in after reflector element in the first light path and the second light path, and wherein reflector element is provided to be substantially similar to location guide second light path of the first light path on projection screen; Controller is communicated by letter with projector; Shell encapsulates polarization beam apparatus, polarization rotation element, reflector element and polarization switch substantially.
The utility model also provides a kind of optical projection system of utilizing polarized light stereoscopic image coding, described optical projection system comprises: projector, polarization conversion system and polarization switch, and projector comprises and is provided to export random polarization to the projecting lens of polarization conversion system; Polarization conversion system and projecting lens optical coupled, polarization conversion system comprises polarization beam apparatus, polarization rotation element and reflector element, polarization beam apparatus is provided to guide light in the first light path and the second light path; Polarization rotation element is placed in the second light path; Reflector element is placed in the second light path; Polarization switch is placed in the first light path and the second light path, and wherein the first light path forms image on projection screen, and wherein reflector element guides the light in the second light path towards projection screen.
In embodiment, describe aspect other below and embodiment.
Accompanying drawing explanation
Fig. 1 is the schematic diagram for the conventional polarization switch of stereoprojection;
Fig. 2 A is according to the schematic diagram of the polarization conversion system for motion-picture projection of the present disclosure (PCS);
Fig. 2 B is according to the schematic diagram of polarization beam apparatus of the present disclosure (PBS);
Fig. 3 is according to the schematic diagram of another embodiment of the PCS for motion-picture projection of the present disclosure;
Fig. 4 is according to the schematic diagram of another embodiment of the PCS for motion-picture projection of the present disclosure, and this embodiment comprises along light path and has the lens of dolly-out,ing dolly-back (telephoto lens) of the visual field centered by optical axis;
Fig. 5 is according to the schematic diagram of another embodiment of the PCS for motion-picture projection of the present disclosure, and this embodiment comprises along light path and has the not lens of dolly-out,ing dolly-back of the visual field centered by optical axis;
Fig. 6 is according to the schematic diagram of another embodiment of the PCS for motion-picture projection that circular polarization output is provided of the present disclosure, and this embodiment comprises along light path and has the lens of dolly-out,ing dolly-back of the visual field centered by optical axis;
Fig. 7 is according to the schematic diagram of another embodiment of the PCS for motion-picture projection that linear polarization output is provided of the present disclosure, and this embodiment comprises along light path and has the lens of dolly-out,ing dolly-back of the visual field centered by optical axis;
Fig. 8 is according to the schematic diagram of another embodiment of the PCS for motion-picture projection of the present disclosure;
Fig. 9 is according to the schematic diagram of another embodiment of the PCS for motion-picture projection of the present disclosure;
Figure 10 is according to the schematic diagram of another embodiment of the PCS for motion-picture projection of the present disclosure; And
Figure 11 is according to the three-dimensional view of the embodiment of the PCS for motion-picture projection of the present disclosure.
Embodiment
Description receives the various embodiments of polarisation of light converting system from projector.Polarization conversion system is utilizing polarized light to carry out presenting brighter screen picture in film applications that three-dimensional watches.
Fig. 2 A is the schematic diagram that the polarization conversion system (PCS) 100 for motion-picture projection is shown.The embodiment of polarization conversion system 100 (for example comprises as shown the polarization beam apparatus (PBS) 112 arranged, polarization rotator 114, half-wave plate), reflecting element 116 (for example, folding mirror (fold mirror)) and polarization switch 120.Polarization conversion system 100 can receive image from having the conventional projector of projecting lens 122.
In operation, beam A, B and C from lens 122 random polarizations penetrate, and towards screen 130 projections to form image.In this embodiment, PBS112 replaces the polarizer 22 shown in Fig. 1 to be inserted into.PBS112 transmission P polarized light 124, and reflection S polarized light 126.P polarized light 124 passes polarization switch (bundle A, B and C), and in alternate frame, is polarized switch rotary, identical with bundle A, B and C in Fig. 1.
The S polarized light 126 being reflected by PBS112 passes polarization rotator 114 (for example, half-wave plate, is preferably achromatic in some embodiments), and is rotated as p polarized light 128.New p polarized light 128 passes to folding transmitting mirror 116.The new p polarized light 128 of folding mirror 116 reflection, and it is passed to polarization switch 120.To the rotary synchronous of the polarization switch 120 of p polarization beam A ', B ' and C effect and bundle A, B and C in alternate frame the polarization of rotary irradiating wire harness.Bundle A ', B ' and C ' can be adjusted (for example,, by adjusting the inclination of folding mirror 116) in the position at screen place be in the position at screen place, to approach consistent or in full accord with beam A, B and C.Because from nearly all random polarization 106 of projecting lens 122 at screen 130 places all by with single polarization state imaging, so the gained brightness of image of the system in Fig. 2 A is approximately three times for the brightness of image at the screen place of the system of Fig. 1.
In this exemplary embodiment, the PBS112 in Fig. 2 A is depicted as sheet.Yet, can use various types of PBS.For example, PBS sheet can be used structure: wire-grid layer on glass (wire grid layer on glass) (for example, Proflux polarizer (Proflux polarizer from Moxtek in Orem from the Moxtek of Utah, USA Orem, UT)), polarisation reclamation film (polarization recycling film) (for example, two brightness enhancement films (Double Brightness Enhancing Film from3M in St.Paul from the 3M of Sao Paulo City, the Minnesota State, MN)), polarisation reclamation film on glass (polarization recycling film on glass) (to obtain flatness) or multilayer dielectric layer (multi-dielectric layer on glass) on glass.PBS112 in Fig. 2 A can alternatively be implemented as glass cube (have wiregrating, polarisation reclamation film or along the dielectric layer at diagonal angle), with the astigmatism that reduces in final image to be associated with light through oblique plate.Alternatively, in various embodiments, the oblique plate PBS112 in Fig. 2 A may be implemented as has spherical, aspheric, columniform or annular surface, reduces the astigmatism in the final image at screen 130 places.Spherical, aspheric, the columniform or annular surface of bias on described and/or spherical, aspheric, the columniform or annular element of additional bias in described light path below can be implemented to reduce the astigmatism in final image.Proc.SPIE the 0237th volume 195-200 page (V.Doherty and D.Shafer referring to for example V.Doherty and D.Shafer in 1980, Proc.SPIE, Vol.0237, pp.195-200,1980) " the Simple method of correcting the aberrations of a beamsplitter in converging light (proofreading and correct the straightforward procedure of the aberration of beam splitter in converging light) " in, this article is merged in hereby by reference.Should also be noted that the second flat board can be inserted in system at inclination PBS plate 112 below, and its inclination can be adjusted to reduce or proofread and correct the astigmatism in final image.
For example, Fig. 2 B is the schematic diagram of cut-open view that illustrates the embodiment of polarization beam apparatus 112.In embodiments, PBS112 can comprise a PBS layer 113 and the 2nd PBS layer 115.The first and second PBS layers can comprise any of any combination of following content: wire-grid layer on glass, polarisation reclamation film, polarisation reclamation film on glass, multilayer dielectric layer and/or the first and second smooth sheets on glass.
Back with reference to Fig. 2 A, in certain embodiments, polarization rotator 114 can be achromatic half-wave plate.Half-wave plate can be in order to the realization of getting off: polymer film (for example, achromatism retardation plate (Achromatic Retardation Plate from ColorLink from the ColorLink company in Boulder city, the state of Colorado, Inc., Boulder, CO)), piezoid or be patterned the alternatively static liquid crystal device that causes how much polarizations to change.Half-wave plate 114 can be set up as shown in Figure 2 A like that, or in other embodiments, it can be arranged between folding mirror 116 and polarization switch 120, intersects with light shafts A ', B ' and C '.This implementation can be desirable, because bundle A ', B ' and C ' reflect from folding mirror 116 under s polarization state, and catoptron has higher reflection conventionally to s polarized light.Yet, utilizing such implementation, it is not overlapping on sheet with C that half-wave plate 114 should be arranged to make to restraint A '.Although in most of embodiments described herein, polarization rotator 114 is positioned in the second light path, but it can alternatively change into and being placed in the first light path, and polarization conversion system will operate in a similar fashion according to principle of the present disclosure.
In certain embodiments, folding mirror 116 can use PBS element (for example, wiregrating sheet (wire grid plate)) to substitute.In this case, after PBS element, can keep purer polarization.
In the polarization conversion system 100 of Fig. 2 A, the light path of light shafts A ', than the optical length of light shafts A (similarly, B '-B and C '-C), causes by the difference of magnification between the image of A ', B ', C ' and A, B, C generation.This difference of magnification may be unacceptable for spectators, especially for wide-angle optical projection system and short Jiao (short-throw) optical projection system.For some technology of proofreading and correct this difference of magnification, can comprise that (1) provides curved surface, compensation difference of magnification having on the folding mirror 116 of optics multiplying power; This solution is achromatic, and this is desirable; (2) by thering is the Fresnel surface of optics multiplying power or Difraction surface, add folding mirror 116 to and compensate difference of magnification (this can be achromatic, or can not be achromatic); (3) refracting element (lens) is added between folding mirror 116 and polarization switch 120 or between PBS112 and folding mirror 116; Single element lens (singlet lens) can not be achromatic, but biplate (doublet) solution can be achromatic; (4) add as in Fig. 3 and Fig. 4 illustrated in the lens of dolly-out,ing dolly-back that illustrate; Or (5) combination of at least two kinds in above four kinds of technology.
Although as described in, p polarized light is transmitted towards polarization switch 120, and s polarized light is guided towards half-wave plate 114, but those of ordinary skill in the art should be understood that, can utilize replaceable configuration, wherein, s polarized light is transmitted towards polarization switch 120, and p polarized light is guided towards half-wave plate 114.
Fig. 3 is the schematic diagram illustrating for another embodiment of the PCS200 of motion-picture projection.The element of PCS200 can have and type and functionally similar type and the function shown in PCS100 in conjunction with Fig. 2 A.For example, element 2xx is similar to element 1xx, and wherein xx is the last double figures of each element.In this embodiment, light shafts A, B and C can be directed by one group of additional folding mirror 232,234, and this is organized additional folding mirror 232,234 and can operate the optical path length that makes as shown in Figure 3 to restraint A and A ', B and B ', C and C ' and equate.Notice, bundle A ' and C ' existence, but be not illustrated.They are followed with A ', B ', C ' shown in Fig. 2 A and restraint similar path.Notice, although PBS is here shown as and becomes 45 degree orientations with optical axis with folding mirror, according to this instruction, PBS212 and folding mirror 216,232,236 can have other orientations.In addition, glass (for example can be inserted in the light path of A ', B ' and C ', by substituting folding mirror 216 with right-angle prism and/or using glass cube PBS to replace sheet PBS), reduce respectively or eliminate the optical path difference between A, B, C and A ', B ', C ' bundle.
With reference to Fig. 2 and Fig. 3, comfortable in order to watch, from the image of bundle A ', B ' and C ' should with image from bundle A, B and C overlapping (but completely overlapping optional) substantially.Some technology with respect to other picture positions of picture position adjustment comprise that (1) makes hand-turn a screw (thumb screws) or similar mechanical technique that folding mirror, PBS sheet or PBS cube are tilted; (2) mechanically make lens or there is element (for example, the curved reflector) bias of optics multiplying power; (3) utilize feedback system as one of adjustment technology, automatically to adjust picture position via earlier figures; Or (4) combination of at least two kinds in above three kinds of technology.
Optical transmission and parasitic light are controlled and can be come optimised for light transmission component by be provided for the antireflection coating of high transmission and low reflection on light transmission component.Reflection from transmissive element can cause parasitic light in system, and this has reduced contrast and/or in final image, has generated interference pseudomorphism.In certain embodiments, additional absorption polarizers can be placed on after the half-wave plate 114 in A ', B ', C ' path and/or after the PBS112 in arbitrary path, controls polarization leakage and improves final image contrast.
Fig. 4 is the schematic diagram illustrating for another embodiment of the PCS300 of motion-picture projection.The element of PCS300 can have and type and functionally similar type and the function shown in PCS100 in conjunction with Fig. 2 A.For example, element 3xx is similar to element 1xx, and wherein xx is the last double figures of each element.
In this exemplary embodiment, the lens of dolly-out,ing dolly-back can be implemented in light to 340 and transmit by the light path of PBS312.Here, the lens of dolly-out,ing dolly-back are settled along light path 340, and have the visual field centered by optical axis.Conventionally, the lens 340 of dolly-out,ing dolly-back allow two elements to carry out the control of magnification, distortion and imaging character, so that two images near-earth is (toward each other, in 1-4 pixel) stack, keep a fraction of spot size of an about pixel and the lateral chromatic aberration of an about pixel simultaneously.Alternatively, the lens (not shown) of oppositely dolly-out,ing dolly-back can be implemented in light from the light path of PBS312 (it is positioned between polarization switch 320 and folding mirror 316 or after folding mirror 316) reflection.If dolly-out,ed dolly-back, lens or the lens of oppositely dolly-out,ing dolly-back are used to control a magnification in light path, and the radial distortion of final image and trapezoidal distortion can be by making single element or element to regulating from optical axis transverse shift.
Fig. 5 is the schematic diagram illustrating for another embodiment of the PCS400 of motion-picture projection.The element of PCS400 can have and type and functionally similar type and the function shown in PCS100 in conjunction with Fig. 2 A.For example, element 4xx is similar to element 1xx, and wherein xx is the last double figures of each element.In this exemplary embodiment, the lens of dolly-out,ing dolly-back can be implemented in light to 440 and transmit by the light path of PBS412.Here, the lens of dolly-out,ing dolly-back are settled along light path 440, and have the visual field of misalignment optical axis.Just as described above, the radial distortion of final image and trapezoidal distortion can be by making single element or element regulate from optical axis transverse shift 440.
Fig. 6 is to provide the schematic diagram of another embodiment of the PCS500 for motion-picture projection of circular polarization output.PCS500 comprises along the lens of dolly-out,ing dolly-back light path, that have the visual field centered by optical axis 540.In this case, each polarization switch 520 is for example as U.S. Patent No. 4,792, the circular polarization switch described in 850 (or Z screen (Z-screen)).The contrast level required according to system, the clean up polarizers in each path (cleanup polarizer) the 542, the 544th, optional.For example, comprise that one or two clean up polarizers can strengthen system contrast.PCS500 also comprises housing 592, and housing 592 encapsulation polarization beam apparatus (PBS), polarization rotator 514, reflecting element 516, switch 520, long drive lens are to 540 and clean up polarizers 542,544.
Fig. 7 is to provide the schematic diagram of another embodiment of the PCS600 for motion-picture projection of linear polarization output.Here, each polarization switch 620 as submitted on June 14th, 2006, the exercise question U.S. Patent application No.11/424 that is " Achromatic Polarization Switches (achromatic polarization switch) ", achromatic linear polarization switch described in 087 and that manufactured by the ColorLink company in Boulder city, the state of Colorado.Be similar to the embodiment in Fig. 6, the contrast level required according to system, the clean up polarizers the 642, the 644th in each path, optional.For example, comprise that one or two clean up polarizers can strengthen system contrast.In addition, according to the achromatism character of polarization switch 620, achromatism spinner 648 is optional.PCS600 also comprises housing 692, and housing 692 encapsulation polarization beam apparatus (PBS), achromatism spinner 648, reflecting element 616, switch 620, long drive lens are to 640 and clean up polarizers 642,644.
Fig. 8 is the schematic diagram for another embodiment of the PCS700 of motion-picture projection, and this schematic diagram illustrates so replaceable configuration, and wherein, polarizer 746, achromatism spinner 714 and polarization switch 720 are positioned in after other optical modules.The element of PCS700 can have and type and functionally similar type and the function shown in PCS100 in conjunction with Fig. 2 A.For example, element 7xx is similar to element 1xx, and wherein xx is the last double figures of each element.PCS700 also comprises housing 792, and housing 792 encapsulation polarization beam apparatus (PBS) 712, achromatism spinner 714, reflecting element 716, switch 720, long drive lens are to 740 and polarizer 746.
In operation, light leaves projecting lens 722 towards PBS712.P polarized light towards the lens of dolly-out,ing dolly-back to 740, then towards polarization switch 720 through PBS712.Optional clean up polarizers 746 can be positioned in dolly-out, dolly-back lens to 740 and polarization switch 720 between further to strengthen contrast.The s polarized light being reflected by PBS712 is guided towards folding mirror 716, and wherein, it is towards 714 reflections of achromatism spinner, and then it is through optional clean up polarizers 746, and achromatism spinner 714 is transformed to p polarized light by s polarized light.Then, the p polarized light from achromatism spinner 714 passes polarization switch 720.In this configuration, the s polarized light being reflected by PBS716 is reflected expeditiously, and polarization is kept by folding mirror 716.This has alleviated protect inclined to one side any needs from folding path, and makes brightness minimum.90 ° of spinners 714 of achromatism (may be stacking based on retardation plate) can be used to the light of autofolding catoptron in the future and be converted to quadrature.In order to eliminate P reflection from PBS712, clean up polarizers 746 may be desirable.This preferably follows after achromatism spinner 714, thereby reduces the polarization conversion efficiency as the factor in system level contrast.
PCS700 provides high-contrast image on screen.In this exemplary embodiment, final screen picture has the optical axis Shang center that is positioned at projecting lens.In certain other embodiments, final screen picture can be arranged to misalignment optical axis---and for example, half screen height is below the optical axis of projecting lens.In such embodiments, polarization beam apparatus 712 can be arranged as interception again from the full irradiation of projecting lens 722, and folding mirror 716 can be tilted suitably two images are superimposed upon on screen.Polarization switch 720 in this embodiment is divided into two elements (one, each path) to improve manufacture productive rate; But as previously discussed, it can be alternatively individual unit.
Fig. 9 is the schematic diagram that the polarization conversion system (PCS) 190 for motion-picture projection is shown.The embodiment of polarization conversion system 190 comprises polarization beam apparatus (PBS) 112, polarization rotator 114 (for example, half-wave plate), reflecting element 116 (for example, folding mirror) and the polarization switch 120 of arranging as shown.Polarization conversion system 190 can receive image from having the conventional projector of projecting lens 122.
In operation, light shafts A, B and C from lens 122 random polarizations penetrate, and towards screen 130 projections to form image.In this embodiment, PBS112 replaces the polarizer 22 shown in Fig. 1 to be inserted into.PBS112 transmission P polarized light 124, and reflection S polarized light 126.P polarized light 124 passes polarization switch (bundle A, B and C), and in alternate frame, is polarized switch rotary, similar with bundle A, B and C in Fig. 1.
The S polarized light 126 being reflected by PBS112 passes polarization rotator 114 (for example, half-wave plate, is preferably achromatic in some embodiments), and is rotated as p polarized light 128.New p polarized light 128 passes to folding mirror 116.The new p polarized light 128 of folding mirror 116 reflection, and it is passed to polarization switch 120.To the rotary synchronous of the polarization switch 120 of p polarized light wire harness A ', B ' and C ' effect and bundle A, B and C in alternate frame the polarization of rotary irradiating wire harness.Bundle A ', B ' and C ' can be adjusted (for example,, by adjusting the inclination of folding mirror 116) in the position at screen place be in the position at screen place, to approach consistent or in full accord with bundle A, B and C.Because from nearly all random polarization 106 of projecting lens 122 all on screen 130 by with single polarization state imaging, so the brightness of the gained image of the system in Fig. 9 is three times for the brightness of image at the screen place of the system of Fig. 1.
In this exemplary embodiment, the PBS112 in Fig. 9 is depicted as sheet.Yet, as discussed about Fig. 2 A and Fig. 2 B above, can use various types of PBS.Should also be noted that the second smooth sheet can be inserted in system at the PBS sheet 112 tilting below, and its inclination can be adjusted to reduce or proofread and correct the astigmatism in final image.
In certain embodiments, the polarization rotator in Fig. 9 114 can be achromatic half-wave plate.Half-wave plate can be in order to the realization of getting off: polymer film (for example, achromatism retardation plate (Achromatic Retardation Plate from ColorLink from the ColorLink company in Boulder city, the state of Colorado, Inc., Boulder, CO)), piezoid or be patterned the alternatively static liquid crystal device that causes how much polarizations to change.Half-wave plate 114 can be set up as shown in Figure 9, or in other embodiments, it can be arranged between folding mirror 116 and polarization switch 120, intersects with bundle A ', B ' and C '.This implementation can be desirable, because bundle A ', B ' and C ' reflect from folding mirror 116 under s polarization state, and catoptron has higher reflection conventionally to s polarized light.Yet, utilizing such implementation, half-wave plate 114 should be arranged to make beam A ' and C not overlapping on sheet.Although in most of embodiments described herein, polarization rotator 114 is positioned in the second light path, but it can alternatively change into and being positioned in the first light path, and polarization conversion system will operate in a similar fashion according to principle of the present disclosure.
In certain embodiments, folding mirror 116 can use PBS element (for example, wiregrating sheet (grid plate)) to substitute.In this case, after PBS element, can keep purer polarization.
In the polarization conversion system 190 of Fig. 9, the light path of light shafts A ', than the optical length of light shafts A (similarly, B '-B and C '-C), causes by the difference of magnification between the image of A ', B ', C ' and A, B, C generation.This difference of magnification may be unacceptable for spectators, especially for wide-angle optical projection system He Duan out-of-focus projection system.For some technology of proofreading and correct this difference of magnification, can comprise that (1) provides curved surface, compensation difference of magnification having on the folding mirror 116 of optics multiplying power; This solution is achromatic, and this is desirable; (2) by thering is the Fresnel surface of optics multiplying power or Difraction surface, add folding mirror 116 to and compensate difference of magnification (this can be achromatic, or can not be achromatic); (3) refracting element (lens) is added between folding mirror 116 and polarization switch 120 or between PBS112 and folding mirror 116; Single element lens can not be achromatic, but biplate solution can be achromatic; (4) add as in Fig. 3 and Fig. 4 illustrated in the lens of dolly-out,ing dolly-back that illustrate; Or (5) combination of at least two kinds in above four kinds of technology.
Although as described in, p polarized light is transmitted towards polarization switch 120, and s polarized light is guided towards half-wave plate 114, but those of ordinary skill in the art should be understood that, can utilize replaceable configuration, wherein, s polarized light is transmitted towards polarization switch 120, and p polarized light is guided towards half-wave plate 114.
Figure 10 be illustrate with like the system class shown in Fig. 9 for the schematic diagram of the polarization conversion system (PCS) 195 of motion-picture projection.The embodiment of polarization conversion system 195 comprises polarization beam apparatus (PBS) 112, polarization rotator 114 (for example, half-wave plate), reflecting element 116 (for example, folding mirror) and the polarization switch 120 of arranging as shown.Polarization conversion system 195 can receive image from having the conventional projector of projecting lens 122, and projecting lens 122 provides unit 196 to receive image from the image of projector.
The controller 199 that provides unit 196 to communicate by letter and further communicate by letter with polarization switch 120 with image can also be provided projection converting system 195, and image provides unit 196 that picture frame is provided in projector.Controller 199 can operate to make polarization switch 120 and the image from projector to provide unit 196 to send image synchronization.
Figure 11 is the three-dimensional view of the embodiment of PCS1100.The element of PCS1100 can have with in conjunction with 100,200,300,400,500,600,700,190 and 195 shown types and functionally similar type and function.One skilled in the art will appreciate that and understand various elements included in PCS100,200,300,400,500,600,700,190 and 195 how can be included in the PCS1100 shown in Figure 11.
As used herein, term " motion-picture projection " refers to the image projection of using front projection technology and/or rear shadow casting technique, and comprise, but be not limited to, for cinema, home theater, simulator, instrument, head-up display (head-up display) and the application that shows other projection environment of stereo-picture.
Although below described several embodiments and variation pattern for the polarization conversion system of stereoprojection, it should be understood that they are only presented by way of example, and nonrestrictive.Thereby the width of described utility model (one or more) and scope are not limited by any above-mentioned exemplary should, and any claim that should only announce according to the disclosure and their equivalents limit.And above advantage and feature are provided in described embodiment, but should by the application restric-tion of the claim of these announcements, not be arbitrary or whole method and structure of realizing above advantage.
In addition, paragraph heading be herein be provided to consistent with the suggestion of 37CFR1.77, or for structure clue is provided.The utility model (one or more) of setting forth any claim that these titles should not limit or characterization can be announced from the disclosure.Particularly and by way of example, although title refers to " technical field ", claims should be restricted to and describe so-called technical field by selected language under this title.Further, the description of the technology in " background technology " is not will be read as to admit that a certain technology is the prior art of any practical novel (one or more) in the disclosure." utility model content " neither be considered to be in the feature of the utility model (one or more) of setting forth in claims of announcement and describe.In addition, in the disclosure, any the quoting to " utility model " of odd number should not be used to prove in the disclosure, only have a novel point.Restriction according to a plurality of claims of announcing from the disclosure, can set forth a plurality of utility models, and these claims has correspondingly defined utility model (one or more) and their equivalents by its protection.In all examples, the scope of these claims is understood according to the essence of these claims itself according to the disclosure, and should not limited by the title of being stated herein.
Claims (18)
1. a polarization conversion system, is characterized in that, described polarization conversion system comprises:
Polarization beam apparatus, described polarization beam apparatus is provided to receive random polarization light beam from projection lenses, and is provided to have along the first light path guiding the first light beam of the first polarization state, and along the second light path guiding, has the second light beam of the second polarization state;
Polarization rotator, described polarization rotator is placed in described the second light path, and described polarization rotator is provided to change described the second polarization state into described the first polarization state; And
Polarization switch, described polarization switch is provided to from described the first light path and described the second light path, receive described the first light beam and described the second light beam respectively, and is provided to optionally change the polarization state of described the first light beam and described the second light beam one of into the first output polarization state and second output polarization state.
2. polarization conversion system as claimed in claim 1, it is characterized in that, described polarization conversion system also comprises reverberator, and described reverberator is placed in described the second light path, is provided to described the second light beam to be directed to the position that is substantially similar to described the first light beam on projection screen.
3. polarization conversion system as claimed in claim 1, is characterized in that, described polarization switch comprises single plate, and described single plate is provided to receive light from described the first light path and described the second light path.
4. polarization conversion system as claimed in claim 1, it is characterized in that, described polarization switch comprises the first polarization switch plate and the second polarization switch plate, described the first polarization switch plate is provided to receive light from described the first light path, and described the second polarization switch plate is provided to receive light from described the second light path.
5. polarization conversion system as claimed in claim 4, is characterized in that, described polarization conversion system is also included in and in described the first light path, is placed in described the first polarization switch lens pair of dolly-out,ing dolly-back below.
6. polarization conversion system as claimed in claim 1, is characterized in that, described the first output polarization state and described the second output polarization state quadrature.
7. polarization conversion system as claimed in claim 1, it is characterized in that, described polarization conversion system is also included in described the first light path and is placed in described polarization switch a pair of catoptron below, and described a pair of catoptron is provided to make described the first light path substantially to equate with the optical path length between described the second light path.
8. polarization conversion system as claimed in claim 1, is characterized in that, described polarization conversion system also comprises controller, and described controller is communicated by letter with described projector.
9. polarization conversion system as claimed in claim 1, is characterized in that, described polarization conversion system also comprises controller, and described controller is communicated by letter with described projector with described polarization switch.
10. polarization conversion system as claimed in claim 1, is characterized in that, described polarization conversion system also comprises the shell that encapsulates described polarization beam apparatus, described polarization rotator and described polarization switch.
11. polarization conversion systems as claimed in claim 1, is characterized in that, described polarization rotator comprises that retardation plate is stacking.
12. 1 kinds of polarization conversion systems, is characterized in that, described polarization conversion system comprises:
Polarization beam apparatus, described polarization beam apparatus is provided to guide light in the first light path and the second light path and is provided to receive light from projector;
Polarization rotation element, described polarization rotation element is placed in described the second light path;
Reflector element, described reflector element is placed in described the second light path;
Polarization switch, described polarization switch is placed in after described reflector element in described the first light path and described the second light path, and wherein said reflector element is provided to be substantially similar to the second light path described in the location guide of described the first light path on projection screen;
Controller, described controller is communicated by letter with described projector; And
Shell, described shell encapsulates described polarization beam apparatus, described polarization rotation element, described reflector element and described polarization switch substantially.
13. polarization conversion systems as claimed in claim 12, is characterized in that, described polarization switch comprises the single plate being provided to from described the first light path and described the second light path reception light.
14. polarization conversion systems as claimed in claim 12, it is characterized in that, described polarization switch comprises the first polarization switch plate and the second polarization switch plate, described the first polarization switch plate is provided to receive light from described the first light path, and described the second polarization switch plate is provided to receive light from described the second light path.
15. polarization conversion systems as claimed in claim 14, is characterized in that, described polarization conversion system is also included in and in described the first light path, is placed in described the first polarization switch lens pair of dolly-out,ing dolly-back below.
16. 1 kinds of optical projection systems of utilizing polarized light stereoscopic image coding, is characterized in that, described optical projection system comprises:
Projector, described projector comprises and is provided to export random polarization to the projecting lens of polarization conversion system;
Polarization conversion system, described polarization conversion system and described projecting lens optical coupled, described polarization conversion system comprises:
Polarization beam apparatus, described polarization beam apparatus is provided to guide light in the first light path and the second light path;
Polarization rotation element, described polarization rotation element is placed in described the second light path;
Reflector element, described reflector element is placed in described the second light path; And
Polarization switch, described polarization switch is placed in described the first light path and described the second light path, and wherein said the first light path forms image on projection screen, and wherein said reflector element guides the light in described the second light path towards described projection screen.
17. optical projection systems as claimed in claim 16, is characterized in that, described polarization switch is placed in after described reflecting element in described the second light path.
18. optical projection systems as claimed in claim 16, is characterized in that, described polarization switch is placed in before described reflecting element in described the second light path.
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| CN201320376780.0U CN203433207U (en) | 2013-06-27 | 2013-06-27 | Polarization conversion system and projection system using polarized lights to code stereo image |
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| CN201320376780.0U CN203433207U (en) | 2013-06-27 | 2013-06-27 | Polarization conversion system and projection system using polarized lights to code stereo image |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104133297A (en) * | 2014-07-13 | 2014-11-05 | 昆山安亚特光电有限公司 | Polarization conversion device and stereoscopic projection system employing same |
| WO2015123901A1 (en) * | 2014-02-21 | 2015-08-27 | 深圳未来立体科技有限公司 | Optical system for stereoprojection and projection method thereof |
| US9740016B2 (en) | 2007-05-09 | 2017-08-22 | Reald Inc. | Polarization conversion system and method for projecting polarization encoded imagery |
| CN107479199A (en) * | 2017-08-04 | 2017-12-15 | 京东方科技集团股份有限公司 | Head-up display device and system |
| US9927691B2 (en) | 2006-09-29 | 2018-03-27 | Reald Inc. | Polarization conversion systems for stereoscopic projection |
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| US9927691B2 (en) | 2006-09-29 | 2018-03-27 | Reald Inc. | Polarization conversion systems for stereoscopic projection |
| US11143948B2 (en) | 2006-09-29 | 2021-10-12 | Reald Inc. | Polarization conversion systems for stereoscopic projection |
| US9740016B2 (en) | 2007-05-09 | 2017-08-22 | Reald Inc. | Polarization conversion system and method for projecting polarization encoded imagery |
| US10203511B2 (en) | 2007-05-09 | 2019-02-12 | Reald Inc. | Polarization conversion system and method for projecting polarization encoded imagery |
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| WO2015123901A1 (en) * | 2014-02-21 | 2015-08-27 | 深圳未来立体科技有限公司 | Optical system for stereoprojection and projection method thereof |
| CN104133297A (en) * | 2014-07-13 | 2014-11-05 | 昆山安亚特光电有限公司 | Polarization conversion device and stereoscopic projection system employing same |
| CN107479199A (en) * | 2017-08-04 | 2017-12-15 | 京东方科技集团股份有限公司 | Head-up display device and system |
| WO2019184335A1 (en) * | 2018-03-28 | 2019-10-03 | 京东方科技集团股份有限公司 | Head up display device and control method thereof and transportation means |
| US11402633B2 (en) | 2018-03-28 | 2022-08-02 | Boe Technology Group Co., Ltd. | Head-up display device, method for controlling the same, and vehicle |
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