CN105404012A - Double-machine high-luminous efficiency stereo projection system - Google Patents
Double-machine high-luminous efficiency stereo projection system Download PDFInfo
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- CN105404012A CN105404012A CN201510995371.2A CN201510995371A CN105404012A CN 105404012 A CN105404012 A CN 105404012A CN 201510995371 A CN201510995371 A CN 201510995371A CN 105404012 A CN105404012 A CN 105404012A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
- G02B30/25—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type using polarisation techniques
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/34—Stereoscopes providing a stereoscopic pair of separated images corresponding to parallactically displaced views of the same object, e.g. 3D slide viewers
- G02B30/35—Stereoscopes providing a stereoscopic pair of separated images corresponding to parallactically displaced views of the same object, e.g. 3D slide viewers using reflective optical elements in the optical path between the images and the observer
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/16—Cooling; Preventing overheating
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Abstract
The invention provides a double-machine high-luminous efficiency stereo projection system. The projection system comprises a first projector, a first projector accessory polarization subsystem, a second projector and a second projector accessory polarization subsystem. The first projector accessory polarization subsystem is arranged between the first projector and a screen. The second projector accessory polarization subsystem is arranged between the second projector and the screen. An angle is formed between the first projector and the first projector accessory polarization subsystem, and the second projector and the second projector accessory polarization subsystem, thereby projecting images on the screen. Thus, left eye image light beams projected to the screen by the first projector through the first projector accessory polarization subsystem are P linearly polarized light. Right eye image light beams projected to the screen by the second projector through the second projector accessory polarization subsystem are S linearly polarized light, so audiences can see stereo images after wearing linear polarization glasses.
Description
Technical Field
The invention relates to the technical field of 3D projection display, in particular to a dual-machine high-luminous-efficiency stereoscopic projection system.
Background
The existing dual-computer stereo projection playing system is realized by utilizing the following principle: the left eye picture content is played by utilizing a first projector, a light polarizer is arranged on a light emergent face of the first projector, the right eye picture content is played by utilizing a second projector, another light polarizer is arranged on a light emergent face of the second projector, absorption optical axes of the two light polarizers form an included angle of 90 degrees, a viewer wears polarized glasses made of an analyzer, the left eye only views the picture content of the left eye, the right eye only views the picture content of the right eye, and therefore the 3D display effect is presented.
The light polarizers arranged on the light emergent surfaces of the two projectors in the dual-projector stereoscopic projection playing system aim to convert natural light emitted by the projectors into linearly polarized light, but in the conversion process, more than 50% of light intensity is absorbed by the light polarizers and converted into heat, so that the light intensity loss is serious, and the viewing experience of a viewer is poor; in addition, the light intensity is absorbed in the light polarizer in a large amount, thereby generating heat energy, resulting in a phenomenon that the light polarizer is easily heated and cracked.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned deficiencies in the prior art, and provides a dual-projector high-light-efficiency stereoscopic projection system, which aims to solve the problems of low light utilization rate and easy thermal cracking of a light polarizer in the conventional dual-projector stereoscopic projection playing system.
The invention is realized in this way, a dual-projector high-light-efficiency stereo projection system, which comprises a first projector, a first projector auxiliary polarization subsystem, a second projector and a second projector auxiliary polarization subsystem, wherein the first projector auxiliary polarization subsystem is arranged between the first projector and a screen, the second projector auxiliary polarization subsystem is arranged between the second projector and the screen, and the first projector auxiliary polarization subsystem and the second projector auxiliary polarization subsystem are arranged at a certain angle so as to project images onto the screen; wherein,
the first projector auxiliary polarization subsystem comprises a first polarization light splitting component, a first reflection element, a second reflection element, a first polarization rotation element, a first focusing component and a first polarization enhancement element;
the second projector auxiliary polarization subsystem comprises a second polarization beam splitting component, a second focusing component, a third reflecting element, a fourth reflecting element, a second polarization rotating element, a third polarization rotating element and a second polarization enhancing element;
the first projector is used for projecting left-eye picture beams;
the first polarization light splitting component is arranged in an emergent light path of the first projector and is used for splitting a left eye picture light beam projected by the first projector into three light beams of a first light path, a second light path and a third light path, wherein the first light path is transmitted S linearly polarized light, and the second light path and the third light path are reflected P linearly polarized light;
the first polarization rotating element is arranged in a first light path emitted by the first polarization light splitting component and used for rotating the polarization direction of the S linearly polarized light of the first light path by 90 degrees to modulate the S linearly polarized light into P linearly polarized light;
the first focusing assembly is arranged behind the emergent surface of the first polarization rotating element and used for adjusting the size of a picture according to different projection distances;
the first reflection element is arranged in the second light path emitted by the first polarization light splitting component and used for guiding the P-linear polarized light of the second light path to the first light path so as to enable the P-linear polarized light to coincide with the first light path;
the second reflecting element is arranged in the third light path emitted by the first polarization light splitting component and used for guiding the P-linear polarized light of the third light path to the first light path so as to enable the P-linear polarized light to coincide with the first light path;
the first polarization enhancement element is arranged in a superposed light path of the first light path, the second light path and the third light path and is used for enhancing the polarization degree of P linear polarized light of the first light path, the second light path and the third light path;
the second projector is used for projecting right-eye picture beams;
the second polarization light splitting component is arranged in an emergent light path of the second projector and is used for splitting a right-eye picture light beam projected by the second projector into a fourth light path, a fifth light path and a sixth light path, wherein the fourth light path is transmitted S linearly polarized light, and the fifth light path and the sixth light path are reflected P linearly polarized light;
the second focusing assembly is arranged in the fourth light path emitted by the second polarization light splitting assembly and used for adjusting the size of a picture according to different projection distances;
the third reflecting element is arranged in the fifth light path emitted by the second polarization light splitting component and used for guiding the P-linear polarized light of the fifth light path to the fourth light path so as to enable the P-linear polarized light to coincide with the fourth light path;
the fourth reflecting element is arranged in the sixth light path emitted by the second polarization light splitting component and used for guiding the P-linear polarized light of the sixth light path to the fourth light path so as to enable the P-linear polarized light to coincide with the fourth light path;
the second polarization rotating element is arranged in an emergent light path of the third reflecting element in the fifth light path and is used for rotating the P linearly polarized light of the fifth light path by 90 degrees and modulating the P linearly polarized light into S linearly polarized light;
the third polarization rotating element is arranged in the exit light path of the fourth reflecting element in the sixth light path and is used for rotating the P linearly polarized light of the sixth light path by 90 degrees and modulating the P linearly polarized light into S linearly polarized light;
the second polarization enhancement element is arranged in the fourth light path, the fifth light path and the sixth light path superposed light path and is used for enhancing the polarization degree of the S-shaped polarized light of the fourth light path, the fifth light path and the sixth light path.
Furthermore, the first polarization beam splitting assembly and the second polarization beam splitting assembly are both three-optical-path polarization beam splitting prisms, each three-optical-path polarization beam splitting prism is formed by gluing three triangular prisms, and two gluing polarization beam splitting surfaces of each three-optical-path polarization beam splitting prism are cuboid three-optical-path polarization beam splitting prisms perpendicular to each other.
Furthermore, the first reflecting element, the second reflecting element, the third reflecting element and the fourth reflecting element are all plane mirrors, and the inclination angles of the plane mirrors are adjustable.
Further, the first polarization rotating element, the second polarization rotating element and the third polarization rotating element are all half-wave plates or/and liquid crystal phase retarders.
Further, the first polarization rotation element may be disposed before or after the first focusing assembly, the second polarization rotation element may be disposed in an incident light path of the third reflection element or in an emergent light path of the third reflection element, and the third polarization rotation element may be disposed in an incident light path of the fourth reflection element or in an emergent light path of the fourth reflection element.
Furthermore, the first focusing assembly and the second focusing assembly are both lens groups consisting of at least two lenses.
Further, the first polarization enhancement element and the second polarization enhancement element are both polarizers.
Furthermore, a first phase modulation device for modulating P-polarized light emitted by the first projector auxiliary polarization subsystem into left-handed circularly polarized light is inserted in the exit light path of the first projector auxiliary polarization subsystem, and a second phase modulation device for modulating S-polarized light emitted by the second projector auxiliary polarization subsystem into right-handed circularly polarized light is inserted in the exit light path of the second projector auxiliary polarization subsystem.
Further, the first and second phase modulation devices are each 1/4 wave plates.
The dual-projector high-luminous-efficiency stereoscopic projection system has the advantages that the dual-projector high-luminous-efficiency stereoscopic projection system comprises a first projector, a first projector auxiliary polarization subsystem, a second projector and a second projector auxiliary polarization subsystem, the first projector auxiliary polarization subsystem is arranged between the first projector and a screen, the second projector auxiliary polarization subsystem is arranged between the second projector and the screen, the first projector and the first projector auxiliary polarization subsystem, the second projector and the second projector auxiliary polarization subsystem are arranged at a certain angle so as to project an image onto the screen, and therefore, the image beam projected by the first projector is P linearly polarized light through the first projector auxiliary polarization subsystem, the image beam projected to the screen is projected by the second projector, the image beam projected to the screen is S linearly polarized light, the vibration directions of the S linearly polarized light P and the S linearly polarized light are perpendicular, the left eye and the right eye of a viewer wearing the linear polarization glasses can only see the left eye picture, and the right eye can only see the right eye picture, so that the viewer can see three-dimensional images, and the problems that the light utilization rate of the existing double-machine stereoscopic projection playing system is low and a light polarizer is easy to be heated and burst are effectively solved.
Drawings
Fig. 1 is a schematic diagram of a dual-projector high-light-efficiency stereoscopic projection system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of modulating the S-linear polarized light of the first optical path into P-linear polarized light in the dual-organic high-luminous-efficiency stereoscopic projection system provided in fig. 1.
Fig. 3 is a schematic diagram of modulating P-linearly polarized light of a fifth optical path into S-linearly polarized light in the dual-lens high-light-efficiency stereoscopic projection system provided in fig. 1.
Fig. 4 is a schematic diagram of a dual-lens high-light-efficiency stereoscopic projection system according to another embodiment of the present invention.
Fig. 5 is a schematic diagram of the dual-lens high-luminous-efficiency stereoscopic projection system provided in fig. 4, in which the linear polarized light of the first optical path S is modulated into a left-handed circular polarized light.
Fig. 6 is a schematic diagram of the dual-lens high-luminous-efficiency stereoscopic projection system provided in fig. 4, in which a fifth light path P linearly polarized light is modulated into a right-handed circularly polarized light.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and should not be taken to limit the invention.
Referring to fig. 1, fig. 1 is a schematic diagram of a dual-projector high-light-efficiency stereoscopic projection system according to an embodiment of the present invention. As shown in fig. 1, the dual-projector high-light-efficiency stereoscopic projection system includes a first projector 101, a first projector-attached polarization subsystem (not shown), a second projector 102, and a second projector-attached polarization subsystem (not shown), wherein the first projector-attached polarization subsystem is disposed between the first projector 101 and the screen 116, the second projector-attached polarization subsystem is disposed between the second projector 102 and the screen 116, and a certain angle is formed between the first projector 101 and the first projector-attached polarization subsystem and between the second projector 102 and the second projector-attached polarization subsystem, so as to project an image onto the screen 116; wherein,
the first projector auxiliary polarization subsystem comprises a first polarization beam splitting component 103, a first reflecting element 105, a second reflecting element 106, a first polarization rotating element 109, a first focusing component 112 and a first polarization enhancing element 114;
the second projector auxiliary polarization subsystem comprises a second polarization beam splitting assembly 104, a second focusing assembly 113, a third reflecting element 107, a fourth reflecting element 108, a second polarization rotating element 110, a third polarization rotating element 111 and a second polarization enhancing element 115;
the first projector 101 is used for projecting a left-eye image beam;
the first polarization light splitting component 103 is arranged in an emergent light path of the first projector 101 and is used for splitting a left-eye picture light beam projected by the first projector 101 into three light beams of a first light path 1, a second light path 2 and a third light path 3, wherein the first light path 1 is transmitted S linearly polarized light, and the second light path 2 and the third light path 3 are reflected P linearly polarized light;
the first polarization rotating element 109 is arranged in the first optical path 1 emitted by the first polarization beam splitting assembly 103, and is used for rotating the polarization direction of the S-linear polarized light of the first optical path 1 by 90 degrees to modulate the S-linear polarized light into P-linear polarized light;
a first focusing assembly 112 is disposed behind the exit surface of the first polarization rotation element 109 for adjusting the size of the picture according to different projection distances, in which case the first focusing assembly 112 is disposed in the first optical path 1
The first reflecting element 105 is arranged in the second optical path 2 emitted by the first polarization beam splitting component 103, and is used for guiding the P-linear polarized light of the second optical path 2 to the first optical path 1 so as to enable the P-linear polarized light to coincide with the first optical path 1;
the second reflecting element 106 is arranged in the third optical path 3 emitted from the first polarization beam splitting component 103, and is used for guiding the P-linear polarized light of the third optical path 3 to the first optical path 1, so that the P-linear polarized light is overlapped with the first optical path 1;
the transmission direction of the first polarization enhancing element 114 is the same as the vibration direction of the P-linear polarized light, and the first polarization enhancing element 114 is arranged in the superposed light path of the first light path 1, the second light path 2 and the third light path 3 and is used for enhancing the polarization degree of the P-linear polarized light of the first light path 1, the second light path 2 and the third light path 3;
the second projector 102 is used for projecting a right-eye picture beam;
the second polarization beam splitting component 104 is disposed in the emergent light path of the second projector 102, and is configured to split the right-eye picture light beam projected by the second projector 102 into three light beams, namely a fourth light path 4, a fifth light path 5, and a sixth light path 6, where the fourth light path 4 is transmitted S-linear polarized light, and the fifth light path 5 and the sixth light path 6 are reflected P-linear polarized light;
the second focusing assembly 113 is arranged in the fourth optical path 4 emitted by the second polarization beam splitting assembly 104 and is used for adjusting the size of a picture according to different projection distances;
the third reflecting element 107 is arranged in the fifth optical path 5 emitted by the second polarization beam splitting component 104, and is used for guiding the P-linear polarized light of the fifth optical path 5 to the fourth optical path 4, so that the P-linear polarized light is overlapped with the fourth optical path 4;
the fourth reflecting element 108 is arranged in the sixth optical path 6 emitted from the second polarization beam splitting assembly 104, and is used for guiding the P-linear polarized light of the sixth optical path 6 to the fourth optical path 4, so that the P-linear polarized light is overlapped with the fourth optical path 4;
the second polarization rotating element 110 is arranged in an emergent light path of the third reflecting element 107 in the fifth light path 5, and is used for rotating the P-linear polarization light of the fifth light path 5 by 90 degrees to modulate the P-linear polarization light into S-linear polarization light;
the third polarization rotating element 111 is arranged in an emergent light path of the fourth reflecting element 108 in the sixth light path 6 and is used for rotating the P-linear polarization light of the sixth light path 6 by 90 degrees to be modulated into S-linear polarization light;
the transmission direction of the second polarization enhancing element 115 is the same as the vibration direction of the S-linearly polarized light, and the second polarization enhancing element 115 is arranged in the superposed light path of the fourth light path 4, the fifth light path 5 and the sixth light path 6, and is used for enhancing the polarization degree of the S-linearly polarized light of the fourth light path 4, the fifth light path 5 and the sixth light path 6;
it should be noted that, in the embodiment of the present invention, the polarization splitting element is disposed in the first optical path 1 emitted from the first polarization splitting assembly 103, and the fast axis of the first polarization rotating element 109 and the vibration direction of the S-linear polarized light form an angle of 45 degrees and are disposed in front of the incident surface of the first focusing assembly 112, or may be disposed behind the emergent surface of the first focusing assembly 112, and is configured to modulate the S-linear polarized light of the first optical path into the P-linear polarized light.
It should be noted that, in the embodiment of the present invention, the light beam emitted by the first polarization enhancing element 114 and projected onto the screen 116 is P-linear polarized light;
in the embodiment of the present invention, the fast axis of the second polarization rotating element 110 and the vibration direction of the P-linear polarized light form an angle of-45 degrees in the fifth optical path 5, and may be disposed at any position between the third reflecting element 107 and the second polarization splitting assembly 104, or at any position between the third reflecting element 107 and the second polarization enhancing element 115.
In the embodiment of the present invention, the fast axis of the third polarization rotating element 111 and the vibration direction of the P-linearly polarized light are disposed at an angle of-45 degrees in the sixth optical path 6, and may be disposed at any position between the fourth reflecting element 108 and the second polarization splitting assembly 104, or may be disposed at any position between the fourth reflecting element 108 and the second polarization enhancing element 115.
Preferably, the first polarization beam splitting assembly 103 and the second polarization beam splitting assembly 104 are three-optical-path polarization beam splitting prisms, and the three-optical-path polarization beam splitting prisms are formed by gluing three triangular prisms, and two gluing polarization beam splitting surfaces of the three-optical-path polarization beam splitting prisms are rectangular parallelepiped three-optical-path polarization beam splitting prisms perpendicular to each other.
Preferably, the first reflective element 105, the second reflective element 106, the third reflective element 107 and the fourth reflective element 108 are all plane mirrors and have adjustable tilt angles.
Preferably, the first polarization rotating element 109, the second polarization rotating element 110 and the third polarization rotating element 111 are all half-wave plates or/and liquid crystal phase retarders.
Further, the first polarization rotation element 109 may be disposed before the first focusing assembly 112 or after the first focusing assembly 112, the second polarization rotation element 110 may be disposed in the incident light path of the third reflective element 107 or in the emergent light path of the third reflective element 107, and the third polarization rotation element 111 may be disposed in the incident light path of the fourth reflective element 107 or in the emergent light path of the fourth reflective element 107.
Preferably, the first focusing assembly 112 and the second focusing assembly 113 are each a lens group consisting of at least two lenses.
Referring to fig. 2, fig. 2 is a schematic diagram of the dual-organic high-luminous-efficiency stereoscopic projection system provided in fig. 1, in which S-linear polarized light in the first optical path is modulated into P-linear polarized light. As shown in fig. 2, the modulation process of modulating S-linear polarized light in the first optical path into P-linear polarized light in the dual-lens high-efficiency stereoscopic projection system is as follows: the light beam of the first optical path 1 transmitted from the first polarization beam splitting assembly 103 is S-linear polarized light, the S-linear polarized light passes through the first polarization rotating element 109 whose fast axis forms 45 degrees with the vibration direction thereof, the vibration direction of the S-linear polarized light rotates 90 degrees and is modulated into P-linear polarized light, and after the P-linear polarized light passes through the first polarization enhancing element 114 whose vibration direction is the same as that of the S-linear polarized light, the vibration direction is unchanged and the P-linear polarized light remains P-linear polarized light, so that the polarization degree is enhanced.
Referring to fig. 3, fig. 3 is a schematic diagram of the dual-lens high-luminous-efficiency stereoscopic projection system provided in fig. 1, in which P-linearly polarized light in a fifth optical path is modulated into S-linearly polarized light. As shown in fig. 3, the modulation process of modulating P-linearly polarized light in the fifth optical path into S-linearly polarized light in the dual-lens high-efficiency stereoscopic projection system is as follows: the fifth light beam reflected from the second polarization beam splitting assembly 104 is P-polarized light, the P-polarized light passes through a second polarization rotating element 110 with a fast axis forming-45 degrees with the vibration direction thereof, the vibration direction of the P-polarized light rotates by 90 degrees and is modulated into S-polarized light, and after the S-polarized light passes through a second polarization enhancing element 115 with the same vibration direction as the vibration direction, the S-polarized light still becomes S-polarized light without changing the vibration direction, and the polarization degree is enhanced.
It should be noted that, in the embodiment of the present invention, the sixth optical path and the fifth optical path have the same polarization modulation principle, and the modulation principle that P linear polarized light in the sixth optical path of the dual-organic high-luminous-efficiency stereoscopic projection system is modulated into S linear polarized light may refer to the modulation principle that P linear polarized light in the fifth optical path of the dual-organic high-luminous-efficiency stereoscopic projection system is modulated into S linear polarized light.
In the embodiment of the invention, the light beam of the left eye projected to the screen 116 by the first projector 101 and the auxiliary polarization subsystem of the first projector is P-linear polarized light, the light beam of the right eye projected to the screen 116 by the second projector 102 and the auxiliary polarization subsystem of the second projector are S-linear polarized light, the P-linear polarized light and the S-linear polarized light have mutually perpendicular vibration directions, the left eye of a viewer wearing linear polarized glasses can only see a picture of the left eye, and the right eye can only see a picture of the right eye, so that a three-dimensional image is seen, and the problems of low light utilization rate and easy thermal explosion of a light polarizer of the existing dual-projector stereoscopic playing system are effectively solved.
Referring to fig. 4, fig. 4 is a schematic diagram of a dual-projector high-light-efficiency stereoscopic projection system according to another embodiment of the present invention. As shown in fig. 4, on the basis of the first embodiment, a first phase modulation device 117 for modulating P-polarized light emitted from the first projector auxiliary polarization subsystem into left-handed circularly polarized light is inserted in the first projector auxiliary polarization subsystem emission optical path, a second phase modulation device 18 for modulating S-polarized light emitted from the second projector auxiliary polarization subsystem into right-handed circularly polarized light is inserted in the second projector auxiliary polarization subsystem emission optical path, that is, a first phase modulation device 117 is added to the emission surface of the first polarization enhancement element 114 of the first projector auxiliary polarization subsystem, and a second phase modulation device 118 is added to the emission surface of the second polarization enhancement element 115 of the second projector auxiliary polarization subsystem.
Preferably, the first phase modulating device 117 and the second phase modulating device 118 are each 1/4 wave plates.
Referring to fig. 5, fig. 5 is a schematic diagram of the dual-optical-efficiency stereoscopic projection system provided in fig. 4, in which S-polarized light in the first optical path is modulated into left-handed circularly polarized light. As shown in fig. 5, the modulation process of modulating S-polarized light in the first optical path into left-handed circularly polarized light in the dual-optical-efficiency stereoscopic projection system is as follows: a first phase modulation device 117 is added behind the emergent surface of the first polarization enhancement element 114, and the fast axis of the first phase modulation device 117 forms an angle of-45 degrees with the vibration direction of the P-linear polarized light emitted by the first polarization enhancement element 114, and is used for modulating the P-linear polarized light into left-handed circularly polarized light.
Referring to fig. 6, fig. 6 is a schematic diagram of the dual-lens high-luminous-efficiency stereoscopic projection system provided in fig. 4, in which P linearly polarized light in a fifth optical path is modulated into right-handed circularly polarized light. As shown in fig. 6, the modulation process of modulating P-polarized light in the fifth optical path into right-handed circularly polarized light in the dual-optical-efficiency stereoscopic projection system is as follows: and a second phase modulation device 118 is added behind the emergent surface of the second polarization enhancement element 115, and the fast axis of the second polarization enhancement element 115 and the vibration direction of the S-shaped polarized light emitted by the second phase modulation device 118 form an angle of 45 degrees for modulating the S-shaped polarized light into right-handed circularly polarized light.
In the embodiment of the present invention, the light beam projected by the first projector 101 from the left-eye image light beam and projected to the screen 116 through the first projector auxiliary polarization subsystem is left-handed circularly polarized light, the light beam projected by the second projector 102 from the right-eye image light beam and projected to the screen 116 through the second projector auxiliary polarization subsystem is right-handed circularly polarized light, the polarization directions of the left-handed circularly polarized light and the right-handed circularly polarized light are opposite, and the left eye and the right eye of the viewer wearing the circular polarized glasses can only see the left-eye image and the right eye can only see the right-eye image, thereby seeing the three-dimensional image.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A dual-projector high-light-efficiency stereoscopic projection system is characterized by comprising a first projector, a first projector auxiliary polarization subsystem, a second projector and a second projector auxiliary polarization subsystem, wherein the first projector auxiliary polarization subsystem is arranged between the first projector and a screen, the second projector auxiliary polarization subsystem is arranged between the second projector and the screen, and the first projector auxiliary polarization subsystem and the second projector auxiliary polarization subsystem are arranged at a certain angle so as to project an image onto the screen; wherein,
the first projector auxiliary polarization subsystem comprises a first polarization light splitting component, a first reflection element, a second reflection element, a first polarization rotation element, a first focusing component and a first polarization enhancement element;
the second projector auxiliary polarization subsystem comprises a second polarization beam splitting component, a second focusing component, a third reflecting element, a fourth reflecting element, a second polarization rotating element, a third polarization rotating element and a second polarization enhancing element;
the first projector is used for projecting left-eye picture beams;
the first polarization light splitting component is arranged in an emergent light path of the first projector and is used for splitting a left eye picture light beam projected by the first projector into three light beams of a first light path, a second light path and a third light path, wherein the first light path is transmitted S linearly polarized light, and the second light path and the third light path are reflected P linearly polarized light;
the first polarization rotating element is arranged in a first light path emitted by the first polarization light splitting component and used for rotating the polarization direction of the S linearly polarized light of the first light path by 90 degrees to modulate the S linearly polarized light into P linearly polarized light;
the first focusing assembly is arranged behind the emergent surface of the first polarization rotating element and used for adjusting the size of a picture according to different projection distances;
the first reflection element is arranged in the second light path emitted by the first polarization light splitting component and used for guiding the P-linear polarized light of the second light path to the first light path so as to enable the P-linear polarized light to coincide with the first light path;
the second reflecting element is arranged in the third light path emitted by the first polarization light splitting component and used for guiding the P-linear polarized light of the third light path to the first light path so as to enable the P-linear polarized light to coincide with the first light path;
the first polarization enhancement element is arranged in a superposed light path of the first light path, the second light path and the third light path and is used for enhancing the polarization degree of P linear polarized light of the first light path, the second light path and the third light path;
the second projector is used for projecting right-eye picture beams;
the second polarization light splitting component is arranged in an emergent light path of the second projector and is used for splitting a right-eye picture light beam projected by the second projector into a fourth light path, a fifth light path and a sixth light path, wherein the fourth light path is transmitted S linearly polarized light, and the fifth light path and the sixth light path are reflected P linearly polarized light;
the second focusing assembly is arranged in the fourth light path emitted by the second polarization light splitting assembly and used for adjusting the size of a picture according to different projection distances;
the third reflecting element is arranged in the fifth light path emitted by the second polarization light splitting component and used for guiding the P-linear polarized light of the fifth light path to the fourth light path so as to enable the P-linear polarized light to coincide with the fourth light path;
the fourth reflecting element is arranged in the sixth light path emitted by the second polarization light splitting component and used for guiding the P-linear polarized light of the sixth light path to the fourth light path so as to enable the P-linear polarized light to coincide with the fourth light path;
the second polarization rotating element is arranged in an emergent light path of the third reflecting element in the fifth light path and is used for rotating the P linearly polarized light of the fifth light path by 90 degrees and modulating the P linearly polarized light into S linearly polarized light;
the third polarization rotating element is arranged in the exit light path of the fourth reflecting element in the sixth light path and is used for rotating the P linearly polarized light of the sixth light path by 90 degrees and modulating the P linearly polarized light into S linearly polarized light;
the second polarization enhancement element is arranged in the fourth light path, the fifth light path and the sixth light path superposed light path and is used for enhancing the polarization degree of the S-shaped polarized light of the fourth light path, the fifth light path and the sixth light path.
2. The dual-machine high-luminous-efficiency stereoscopic projection system of claim 1, wherein the first polarization beam splitter and the second polarization beam splitter are triple-path polarization beam splitters, each of which is formed by three triangular prisms bonded together, and two bonded polarization beam splitting surfaces of each of the triple-path polarization beam splitters are rectangular parallelepiped triple-path polarization beam splitters perpendicular to each other.
3. The dual-organic high-light-efficiency stereoscopic projection system of claim 1, wherein the first reflective element, the second reflective element, the third reflective element and the fourth reflective element are all plane mirrors and have adjustable tilt angles.
4. The dual-organic high-light-efficiency stereoscopic projection system of claim 1, wherein the first polarization rotating element, the second polarization rotating element and the third polarization rotating element are all half-wave plates or/and liquid crystal phase retarders.
5. The dual-machine high-light-efficiency stereoscopic projection system of claim 1, wherein the first polarization rotation element is disposed in front of the first focusing assembly or behind the first focusing assembly, the second polarization rotation element is disposed in the incident light path of the third reflection element or in the emergent light path of the third reflection element, and the third polarization rotation element is disposed in the incident light path of the fourth reflection element or in the emergent light path of the fourth reflection element.
6. The dual-lens high-luminous-efficiency stereoscopic projection system of claim 1, wherein the first focusing assembly and the second focusing assembly are both a lens assembly consisting of at least two lenses.
7. The dual-organic high-luminous-efficiency stereoscopic projection system of claim 1, wherein the first polarization enhancement element and the second polarization enhancement element are both polarizers.
8. The dual-projector high-luminous-efficiency stereoscopic projection system of claim 1, wherein a first phase modulation device for modulating P-polarized light emitted by the first projector auxiliary polarization subsystem into left-handed circularly polarized light is inserted in the exit light path of the first projector auxiliary polarization subsystem, and a second phase modulation device for modulating S-polarized light emitted by the second projector auxiliary polarization subsystem into right-handed circularly polarized light is inserted in the exit light path of the second projector auxiliary polarization subsystem.
9. The dual-organic high-light-efficiency stereoscopic projection system of claim 7, wherein the first and second phase modulation devices are 1/4 wave plates.
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