CN113009770A - Stereoscopic projection system - Google Patents

Abstract

The present invention provides a stereoscopic projection system comprising at least one projection assembly, the projection assembly comprising: a projector including a lens assembly for emitting partially polarized light; the polarization stereo conversion device comprises a first shell and a light valve arranged in the first shell, wherein the light valve is a single-light-path light valve, and the light valve and a lens assembly are arranged side by side so that part of polarized light emitted by a projector passes through the light valve to be converted into left circularly polarized light and right circularly polarized light for 3D projection. By utilizing the system, the switching of 2D and 3D film projection can be matched without arranging an additional motion mechanism, so that the structure of the whole system is simple and the stability is improved.

Description

Stereoscopic projection system

Cross Reference to Related Applications

This application claims priority to patent application No. CN202010407007.0 entitled "stereoscopic projection system" filed on 14/05/2020, which is incorporated herein by reference in its entirety.

Technical Field

The invention belongs to the technical field of display, and particularly relates to a three-dimensional projection system.

Background

This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.

With the wide application of passive polarization 3D devices and the development of automatic projection technology in projection industries such as cinema, an automatic 2D and 3D switching stereoscopic projection system becomes a mainstream technology in the field of 3D projection display. The main idea is that when 3D projection is carried out, a motion mechanism is used to move passive polarization 3D equipment into the light path of a projector lens and a metal screen, the light of the projector is changed into left-handed or right-handed circularly polarized light which changes according to the frame sequence time sequence after passing through the polarization 3D equipment, and a 3D pattern is generated in human eyes through the metal screen and 3D glasses. When 2D projection is carried out, the motion mechanism moves the passive polarization stereo conversion equipment out of the light path, and human eyes directly see 2D patterns projected by the lens.

The motion device in the automatic switching system has the advantages that the structure of the whole projection system is complex, the occupied space is large, the requirement on the installation environment is high, the application compatibility of special occasions such as hoisting and the like is poor, and the manufacturing, transporting and installing costs of the motion mechanism and the support are relatively high. And the projection lens and the 3D light valve need to move mutually, and cannot be sealed, so that the projection lens and the 3D light valve are exposed in the air, and more dust and oil smoke are absorbed to cause optical interface pollution, thereby influencing the 2D and 3D picture quality.

Disclosure of Invention

In view of the problems in the prior art, a stereoscopic projection system is proposed, by which at least one of the above problems can be solved.

The present invention provides the following.

There is provided a stereoscopic projection system comprising at least one projection assembly, the projection assembly comprising:

a projector including a lens assembly for emitting partially polarized light;

the polarization three-dimensional conversion device comprises a first shell and a light valve arranged in the first shell, wherein the light valve is a single-light-path light valve, the first shell is fixedly connected to the projector, and the light valve and the lens assembly are arranged side by side so that the part of polarized light emitted by the projector passes through the light valve to be converted into left-handed circularly polarized light and right-handed circularly polarized light for 3D projection.

In one possible embodiment, said stereoscopic projection system comprises a single said projection assembly, said system further comprising:

and the control circuit is electrically connected with the projector and the polarization stereo conversion equipment and is used for controlling the light valve to sequentially output the left circularly polarized light and the right circularly polarized light according to frames when the projector performs 3D projection.

In a possible embodiment, the stereoscopic projection system includes two or more projection assemblies, wherein the projectors of the two or more projection assemblies are electrically connected, and the partially polarized light emitted by the projectors of the two or more projection assemblies form the left-handed circularly polarized light and the right-handed circularly polarized light after passing through the corresponding light valves.

In one possible embodiment, the light valve comprises:

the projector emits the partial polarized light which passes through the phase processor, the polarizer and the liquid crystal phase processor in sequence, and the polarization direction of the polarized light in the partial polarized light after passing through the phase processor is the same as the transmission axis of the polarizer.

In one possible embodiment, the polarizer is a reflective polarizer.

In one possible embodiment, the degree of polarization of the partially polarized light emitted by the projector is greater than 75%.

In one possible embodiment, the first housing is removably fixedly attached to the projector.

In one possible implementation, the lens assembly includes a second housing and an exit lens disposed inside the second housing; and a sealed space is formed between the light valve and the light-emitting lens.

In one possible embodiment, the light valve is rotatably mounted to an end of the lens assembly, and the light valve is self-rotatably adjusted according to a polarization state of the partially polarized light and a rotational symmetry characteristic of the light valve to cover a current spot range of the partially polarized light emitted by the projector.

In one possible embodiment, the light valve does not cover the entire spot range of the partially polarized light emitted by the projector at a single instant, which is the sum of the current spot ranges corresponding to each instant.

In a possible embodiment, the minimum distance between the light valve and the lens assembly is determined according to the size of the light valve and the maximum optical energy density of the light valve, and preferably, the size of the light valve is smaller than the size of the light-emitting lens.

In a possible embodiment, the control circuit is integrated inside the first housing and is mounted integrally with the light valve.

In one possible embodiment, the phase processor and the polarizer are separated by a first gap, and the polarizer and the liquid crystal phase processor are separated by a second gap; or the phase processor and the polarizer are attached together, and a second gap is formed between the polarizer and the liquid crystal phase processor; or, the phase processor and the polarizer are separated by a first gap, and the polarizer and the liquid crystal phase processor are attached together.

In one possible implementation mode, the phase processor, the polarizer and the liquid crystal phase processor in the light valve are independently arranged in a single light path light valve outside the lens assembly; or, the phase processor is embedded in the second housing of the lens assembly; or, the phase processor and the polarizer attached to the phase processor are embedded in the second shell of the lens assembly.

In one possible embodiment, the phase processor is formed as an active device, the system further comprising:

the temperature monitoring equipment is used for monitoring the temperature inside the polarization stereo conversion equipment;

and the driving device is used for adjusting the working parameters of the phase processor according to the temperature driving voltage acquired by the temperature monitoring equipment.

The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects: in this embodiment, it is not necessary to move the polarization stereo conversion device 20, and it is also not necessary to set an additional motion mechanism to move the polarization stereo conversion device 20 to match the switching of 2D and 3D film projection, so that the size of the whole system is smaller, the structure becomes simple, the stability is improved, the cost is lower, and the maintainability is stronger. The performance of the smaller light valve enables the 3D crosstalk to be lower, and the loss of contrast in a system frame is smaller due to the sealing design.

It should be understood that the above description is only an overview of the technical solutions of the present invention, so as to clearly understand the technical means of the present invention, and thus can be implemented according to the content of the description. In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

The advantages and benefits described herein, as well as other advantages and benefits, will be apparent to those of ordinary skill in the art upon reading the following detailed description of the exemplary embodiments. The drawings are only for purposes of illustrating exemplary embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like elements throughout. In the drawings:

fig. 1 is a schematic diagram of a stereoscopic projection system according to an embodiment of the invention;

fig. 2 is a schematic diagram of a stand-alone stereoscopic projection system apparatus according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a light valve according to an embodiment of the present invention;

FIG. 4 is a schematic diagram illustrating optical axis relationships of a light valve according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a stereoscopic projection system according to an embodiment of the invention, in which the control circuit is integrated inside the first housing;

fig. 6a is a schematic structural diagram of a light valve according to an embodiment of the present invention, fig. 6b is a schematic structural diagram of a light valve according to another embodiment of the present invention, and fig. 6c is a schematic structural diagram of a light valve according to yet another embodiment of the present invention;

fig. 7a is a schematic configuration diagram of a stereoscopic projection system according to an embodiment of the present invention, fig. 7b is a schematic configuration diagram of a stereoscopic projection system according to another embodiment of the present invention, and fig. 7c is a schematic configuration diagram of a stereoscopic projection system according to yet another embodiment of the present invention;

fig. 8 is a schematic structural diagram of a dual-projector system according to an embodiment of the present invention;

in the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

In the present invention, it should be understood that the terms "first," "second," and the like as used in the specification and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. The terms "comprises," "comprising," or "having," are intended to indicate the presence of the features, integers, steps, acts, elements, components, or groups thereof disclosed in this specification, and are not intended to preclude the presence or addition of one or more other features, integers, steps, acts, elements, components, or groups thereof.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 1, an embodiment of the present invention provides a stereoscopic projection system, which includes at least one projection component, where the stereoscopic projection system may be a stand-alone stereoscopic projection system, or may also be a dual-projector or multi-projector stereoscopic projection system, which is not limited in this application,

wherein, the projection subassembly includes: a projector 10, said projector 10 including a lens assembly 11 for emitting partially polarized light outward, the partially polarized light being a combined beam of finger polarized light and natural light; the polarization stereo conversion device 20 comprises a first housing 21 and a light valve 22 arranged inside the first housing 21, wherein the light valve 22 is a single light path light valve, and the light valve 22 is arranged side by side with the lens assembly 11, so that the part of polarized light emitted by the projector 10 passes through the light valve to be converted into left circularly polarized light and right circularly polarized light for 3D projection when 3D projection is performed.

The light valve 22 and the lens assembly 11 are arranged side by side, so that the polarization stereo conversion device 20 is always positioned in the emergent light path of the projector 10, and the part of polarized light emitted by the projector 10 passes through the light valve to be converted into left circularly polarized light and right circularly polarized light for 3D projection, so that the polarization stereo conversion device 20 does not need to be moved, an additional movement mechanism does not need to be arranged to move the polarization stereo conversion device 20 to match the switching of 2D and 3D film projection, the structure of the whole system is simple, the stability is improved, the requirement on installation space is small, and the stereoscopic projection system has the advantages of small occupied space, low manufacturing cost, low maintenance cost and the like.

In the following, the present application is specifically described and expanded for the case of a stand-alone stereoscopic projection system and the case of a dual or multi-unit stereoscopic projection system, however, it should be understood that the present disclosure should not be limited by the embodiments set forth herein.

Single-machine stereo projection system

In some embodiments, with reference to fig. 2, the stereoscopic projection system may be a stand-alone stereoscopic projection system, i.e. the stereoscopic projection system comprises a single said projection assembly, the system may further comprise: a control circuit 30, wherein the control circuit 30 is electrically connected to the projector 10 and the polarization stereo conversion device 20, and is configured to control the light valve 20 to output the left circularly polarized light and the right circularly polarized light in a frame sequence when the projector 10 performs 3D projection, so that a 3D three-dimensional image projection can be subsequently synthesized.

Alternatively, the control circuit 30 may include a synchronization signal processing unit, a CPU unit, and a polarization modulator driving unit. The synchronization signal processing unit is used for processing the synchronization signal output by the projector 10 and isolating the interference signal introduced by the synchronization signal line of the projector 10. The CPU unit determines the state of the 2D or 3D movie projected by the projector 10 based on the output signal of the synchronization signal processing unit, and determines the operation mode of the polarization modulator driving unit based on the movie state. The polarization modulator driving unit is used to generate driving signals matching the cinematic state of the projector 10 to drive the operation of the light valve 22. When the projector 10 projects a 3D movie, the polarization modulator driving unit drives the light valve 22 to output left-handed circularly polarized light or right-handed circularly polarized light in frame order, thereby synthesizing a 3D three-dimensional image projection.

In some embodiments, referring to fig. 3, the light valve 22 may specifically include: a phase processor 221, a polarizer 222, and a liquid crystal phase processor 223, wherein the phase processor 221 is configured to convert polarized light of partially polarized light and partially unpolarized light into linearly polarized light having a polarization direction equal to a transmission axis of the polarizer 222. The polarizer 222 is used for performing polarization state filtering processing on the light beam after passing through the phase processor; the liquid crystal phase processor 223 is two liquid crystal quarter-wave retarders attached side by side, as shown in fig. 4, the light absorption axis X of the linear polarizer 222 bisects the two liquid crystal optical axes Y of the liquid crystal phase retarder 223 to form a 90-degree angle. In other words, the partially polarized light emitted from the projector 10 passes through the phase processor 221, the polarizer 222, and the liquid crystal phase processor 223 in order, and is converted into left-circularly polarized light and right-circularly polarized light for 3D projection. It will be appreciated that conventional single light path light valves typically include only a polarizer and a liquid crystal phase retarder, and that the benefit of the additional use of a phase processor on this basis is to match the orientation of the partially polarized light to the polarizer to increase transmission. When the polarization ratio of partial polarized light emitted by the projector is greater than 60%, the transmittance of the single-light-path light valve is equivalent to that of a double-light path or a triple-light path, and when the polarization ratio of 1 partial polarized light emitted by the projector is greater than 90%, the transmittance of the single-light-path light valve is higher than that of the traditional double-light path or triple-light path.

In some embodiments, the first housing 21 is detachably and fixedly connected to the projector 10, so that the polarization stereo conversion device 20 can be fixedly mounted on the projector 10 when 2D and 3D projection is required, and the joint of the polarization stereo conversion device 20 and the projector 10 is sealed in a dust-proof manner, thereby reducing the exposure contamination of the lens assembly 11 and the light valve 22. And the polarization stereo conversion device 20 is detached from the projector for use when only 2D projection is performed.

It can be understood that the polarization stereo conversion device 20 may be an ultrahigh light efficiency 3D device, and when the light emitted from the projector 10 has a high transmittance (generally greater than 80%) at the position of the polarization stereo conversion device 20, the projection brightness requirement may also be satisfied without moving the polarization stereo conversion device 20 out of the light path of the projector 10 during 2D projection, and at this time, the connection between the polarization stereo conversion device 20 and the projector 10 is sealed in a dust-proof manner, so as to achieve the purpose of reducing the exposed contamination of the lens assembly 11 and the light valve 22.

In some embodiments, the polarizer 222 may be a reflective polarizer, so that the heat dissipation effect of the polarizer may be ensured.

In some embodiments, to ensure that the projector 10 is securely attached to the polarization stereo conversion device 20 to meet the brightness requirements for 2D and 3D projection, the degree of polarization of the partially polarized light emitted by the projector is greater than 75%. High transmittance can be produced on the light valve described herein, maximizing the use of light is achieved, and not too much light is wasted.

In some embodiments, referring to fig. 1, the lens assembly 11 includes a second housing 111 and an exit lens 112 disposed inside the second housing 111; wherein, a sealed space is formed between the light valve 22 and the light-emitting lens 112.

Referring to fig. 1, the projector 10 specifically includes a main body 12 and a lens assembly 11, where the lens assembly 11 includes a second housing 111 and a lens group, and the lens group is disposed inside the second housing 111 and is arranged side by side with a light valve 22. In this embodiment, the lens group may include a plurality of lenses, and the kind and number of the lenses may be set according to actual needs, which is not limited in this application. It is understood that only the light-exiting lens 112 located at the outermost side of the lens group is shown in the figure, and the light-exiting lens 112 is disposed at a position on the side away from the body 12 in the second housing 111. One end of the second housing 111 is fixedly connected to the body 12, and the other end is fixedly and hermetically connected to the first housing 21. Alternatively, the first housing 21 may be connected to an end portion, an outer side wall, or directly to the body 12 of the second housing 111 to achieve the above-mentioned sealing connection, and the embodiment is not particularly limited. The other end of the second housing 111 is fixed and hermetically connected to the first housing 21 of the polarization stereo conversion device 20, so that the light-emitting lens 112 is arranged side by side with the light valve 22. The lens assembly 11 includes a second housing 111 and an exit lens 112 disposed inside the second housing 111; wherein the first housing is connected to an end of the second housing, an outer sidewall, or an end of a body. Thereby forming a sealed space between the light valve and the exit lens. Thus, the problem of contrast attenuation in a frame caused by dust deposition during projection can be solved. For the mobile scheme, when 3D projection is carried out, 3 surfaces are easy to accumulate dust, and the contrast in a frame is influenced. While only one side is prone to dust when applied for 3D projection after sealing the connection. And the 3D projection has less dust deposition area than the mobile type, and the influence of the dust deposition on the intra-frame contrast can be reduced compared with the mobile type. In addition, the polarization stereo conversion device 20 is hermetically connected with the projector 10 to realize sealed installation, so that the lens assembly 11 and the adjacent light valve 22 are protected from environmental pollution, the attenuation of brightness and contrast is reduced, and the image quality stability is ensured.

In some embodiments, the light valve 22 is rotatably mounted to the end of the lens assembly 11, specifically, the first housing 21 may be rotatably mounted to the end, the outer side wall of the second housing 111 or directly connected to the body 12, the light valve 22 is disposed inside the first housing 21 and can rotate along the axis of the lens assembly following the rotation of the first housing 21, or the light valve 22 can be rotated along the axis of the lens assembly by a rotating member. The light valve 22 performs self-rotation adjustment according to the polarization state of the partially polarized light and the rotational symmetry characteristic of the light valve, so that the influence of the light valve on the emergent partially polarized light is the same before and after rotation, the light valve 22 can cover the current light spot range of the partially polarized light emitted by the projector by using rotational displacement, the same displacement range of the light spot on the lens or the light valve is met, and the light valve can have the same effect as a large light valve covering all areas of the light spot displacement. The light valve 22 does not cover the full spot size of the partially polarized light emitted by the projector at a single instant, which is the sum of the current spot sizes corresponding to each instant. Preferably, the size of the light valve 22 is the minimum size that allows the light valve 22 to cover each current spot range using rotational displacement.

In some embodiments, the minimum distance between the light valve and the lens assembly is determined according to a size of the light valve and a maximum optical energy density of the light valve. It can be understood that in the conventional single light path light valve, the distance between the light valve and the light-emitting lens is generally over 100mm, and the width of the light valve is larger than the outer diameter of the lens. In the embodiment, the distance L between the light valve and the light-emitting lens is greater than Lmin, wherein when the distance between the light valve 22 and the end surface of the light-emitting lens is Lmin, the optical energy density on the light valve 22 is the maximum empirical value that can be borne by the light valve. The size of the light valve is smaller than that of the light-emitting lens, so that a good appearance is still achieved after the single-light-path three-dimensional conversion system is added.

In some embodiments, referring to fig. 5, a control circuit 30 may be integrated inside the first housing and integrally installed with the light valve, the control circuit 30 being used to drive the light valve to operate. It can be understood that the closer the control circuit 30 and the driving board therein and the light valve FPC (flexible circuit board) line are, the stronger the resistance against external interference is. And the integrated installation can ensure the matching problem of the light valve parameters and the driving parameters, is convenient for production, transportation and installation, and is beneficial to saving the cost.

Alternatively, the control circuit 30 may be disposed outside the first housing, and the present application is not limited thereto.

In some embodiments, referring to FIG. 6a, the phase processor 221 and the polarizer 222 are separated by a first gap, and the polarizer 222 and the liquid crystal phase processor 223 are separated by a second gap; alternatively, referring to fig. 6b, the phase processor 221 and the polarizer 222 are attached together, and the polarizer 222 and the liquid crystal phase processor 223 are separated by a second gap; alternatively, referring to FIG. 6c, the phase processor 221 and the polarizer 222 are separated by a first gap, and the polarizer 222 and the liquid crystal phase processor 223 are attached together. It can be understood that when the phase processor 221, the polarizer 222 and the liquid crystal phase retarder 223 are attached together, the temperature of the phase processor is increased after the polarizer 222 absorbs heat, and further the phase retardation of the phase processor 221 is affected, so that the transmittance of the polarizer 222 is decreased, the absorption is further increased, and the temperature is higher, thereby forming a vicious circle to equilibrium. Meanwhile, the polarizer 222 absorbs heat to raise the temperature of the liquid crystal phase processor 223, which results in a reduced stereoscopic contrast and a serious ghost. In this embodiment, the phase processor 221, the polarizer 222, and the liquid crystal phase retarder 223 may be separately disposed to increase a heat dissipation area, so that problems of low transmittance and a serious ghost caused by heat dissipation may be solved.

In some embodiments, referring to fig. 7a and 7b, the phase processor 221 may be embedded in said second housing 111 of the lens assembly 11, with the remaining polarizer 222 and liquid crystal phase retarder 223 in the light valve integrated. Alternatively, the phase processor 221 and the polarizer 222 attached to each other may be embedded in the second housing 111 of the lens assembly 11, as shown in fig. 7 c. The AR glass on the end face of the lens can be reduced in the design.

Alternatively, the light valve 22 shown in fig. 6a, 6b and 6c may of course not be embedded in the lens assembly 11, but instead be formed separately as one piece.

In some embodiments, the phase processor is formed as an active device, the system may further include: the temperature monitoring equipment is used for monitoring the temperature inside the polarization stereo conversion equipment; and the driving device is used for adjusting the working parameters of the phase processor according to the temperature driving voltage acquired by the temperature monitoring equipment. In practical use, the light valve 22 is applied to projectors with different brightness and projection halls and projectors with different projection ratios, the temperature of the liquid crystal is different due to different optical power densities on the light valve, and the ambient temperature is different in different application scenes, so that the temperature of the liquid crystal is higher or lower in different application scenes, and sometimes is different even by 10 to 20 degrees centigrade, and the phase processor (i.e. the quarter wave plate) is not the accurate 1/4 wave plate any more when the temperatures are different, thereby causing the contrast to be reduced and the ghost to be serious. Therefore, the temperature monitoring equipment can be used for monitoring the internal temperature, and the working parameters of the phase processor can be adjusted according to the acquired temperature driving voltage, so that the phase processor can recover the accurate function.

Double-machine or multi-machine stereo projection system

In some embodiments, the stereoscopic projection system may also be a dual-projector or multi-projector stereoscopic projection system, and the stereoscopic projection system includes two or more projection assemblies, wherein the projectors of the two or more projection assemblies are electrically connected to each other, and the partially polarized light emitted by the projectors of the two or more projection assemblies forms the left-circularly polarized light and the right-circularly polarized light after passing through the respective light valves.

Referring to fig. 8, there is shown a dual-projector stereoscopic projection system, in which the number of the projection assemblies is two, and the electrical connection between the projectors 10 of the two projection assemblies is understood to be two single-light path 3D projection assemblies, unlike the above-described embodiment. The light valve of the polarization stereo conversion device 20 may include a phase processor, a linear polarizer, and a passive phase retarder. The present embodiment is different from the embodiment in which the stereoscopic projection system is a stand-alone stereoscopic projection system in that the retarder in the light valve of the foregoing embodiment is a liquid crystal active retarder, whereas the retarder in the light valve of the present embodiment is a passive retarder, but the polarization directions of the lights modulated by the two are both left-handed or right-handed circularly polarized lights.

The light beams of the projectors 10 of the two sets of projection assemblies respectively output left-handed circularly polarized light and right-handed circularly polarized light after passing through the respective light valves. It will be appreciated that the two beam images of the two projectors 10 can be coincident on the screen 90. When performing 3D projection, the light beams from the light-emitting lenses 112 of the two projectors 10 form left-handed circularly polarized light and right-handed circularly polarized light respectively through the 3D light valve, and the two polarized light beams pass through the metal screen 90 and the 3D glasses 80 and then are combined into a 3D image in the human brain.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.

Claims (16)

1. A stereoscopic projection system comprising at least one projection assembly, the projection assembly comprising:

a projector including a lens assembly for emitting partially polarized light;

the polarization stereo conversion device comprises a first shell and a light valve arranged in the first shell, wherein the light valve is a single-light-path light valve, and the light valve and the lens assembly are arranged side by side so that part of polarized light emitted by the projector passes through the light valve to be converted into left circularly polarized light and right circularly polarized light for 3D projection.

2. The stereoscopic projection system of claim 1, comprising a single projection assembly, the system further comprising:

the control circuit is electrically connected with the projector and the polarization stereo conversion equipment and is used for controlling the light valve to sequentially output the left circularly polarized light and the right circularly polarized light according to a frame sequence when the projector performs 3D projection.

3. The stereoscopic projection system of claim 1, comprising two or more of the projection assemblies, wherein projectors of the two or more of the projection assemblies are electrically connected, and the partially polarized light emitted by the projectors of the two or more of the projection assemblies form the left-handed circularly polarized light and the right-handed circularly polarized light, respectively, after passing through the respective light valves.

4. A stereoscopic projection system as claimed in claim 2 or 3, wherein the light valve comprises:

the projector emits the partial polarized light which passes through the phase processor, the polarizer and the liquid crystal phase processor in sequence, and the polarization direction of the polarized light in the partial polarized light after passing through the phase processor is the same as the transmission axis of the polarizer.

5. The stereoscopic projection system of claim 4, wherein the polarizer is a reflective polarizer.

6. The stereoscopic projection system of claim 1 wherein the degree of polarization of the partially polarized light emitted by the projector is greater than 75%.

7. The stereoscopic projection system of claim 1, wherein the first housing is removably fixedly attached to the projector.

8. The stereoscopic projection system of claim 1, wherein the lens assembly includes a second housing and an exit lens disposed inside the second housing; wherein a sealed space is formed between the light valve and the light-emitting lens.

9. The stereoscopic projection system of claim 1, wherein the light valve is rotatably mounted to an end of the lens assembly, the light valve being self-rotatably adjustable according to the polarization state of the partially polarized light and the rotational symmetry characteristics of the light valve to cover a current spot range of the partially polarized light emitted by the projector.

10. The stereoscopic projection system of claim 9, wherein the light valve does not cover the entire spot range of the partially polarized light emitted by the projector at a single time, the entire spot range being the sum of the current spot ranges corresponding to each time instant.

11. The stereoscopic projection system of claim 8, wherein the minimum distance between the light valve and the lens assembly is determined according to a size of the light valve and a maximum optical energy density of the light valve.

12. The stereoscopic projection system of claim 10, wherein the size of the light valve is smaller than the size of the exit lens.

13. The stereoscopic projection system of claim 2, wherein the control circuitry is integrated within the first housing and mounted integral with the light valve.

14. The stereoscopic projection system of claim 4, wherein the phase processor and the polarizer are separated by a first gap, and the polarizer and the liquid crystal phase processor are separated by a second gap; or the phase processor and the polarizer are attached together, and a second gap is formed between the polarizer and the liquid crystal phase processor; or, the phase processor and the polarizer are separated by a first gap, and the polarizer and the liquid crystal phase processor are attached together.

15. The stereoscopic projection system of claim 14,

the phase processor, the polarizer and the liquid crystal phase processor in the light valve are independently arranged in the single-light-path light valve outside the lens component; or, the phase processor is embedded in the second housing of the lens assembly; or, the phase processor and the polarizer attached to the phase processor are embedded in the second shell of the lens assembly.

16. The stereoscopic projection system of claim 4, wherein the phase processor is formed as an active device, the system further comprising:

the temperature monitoring equipment is used for monitoring the temperature inside the polarization stereo conversion equipment;

and the driving device is used for adjusting the working parameters of the phase processor according to the temperature driving voltage acquired by the temperature monitoring equipment.

Images