CN101738737A - Projection system used for presenting stereoscopic image and method thereof - Google Patents
Projection system used for presenting stereoscopic image and method thereof Download PDFInfo
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- CN101738737A CN101738737A CN200810171899A CN200810171899A CN101738737A CN 101738737 A CN101738737 A CN 101738737A CN 200810171899 A CN200810171899 A CN 200810171899A CN 200810171899 A CN200810171899 A CN 200810171899A CN 101738737 A CN101738737 A CN 101738737A
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Abstract
The invention relates to a projection system used for presenting a stereoscopic image and a method thereof. The projection system comprises a lens, an image generator, an optical control unit, a polarization unit and a driving device, wherein the lens is used for projecting an image on a display screen; the image generator is used for alternately outputting a first group of image beams in a first time sequence and a second group of image beams in a second time sequence, and the first group of image beams and the second group of image beams have different visual angles; the optical control unit is used for reflecting the first group of image beams or the second group of image beams which are transmitted by the image generator to the lens; the polarization unit is used for outputting the first group of image beams and the second group of image beams in a polarization way when being rotated to a first angle and a second angle respectively, and the first angle and the second angle have an angle difference of 90 DEG; and the driving device is used for driving the polarization unit to be rotated to the first angle or the second angle. The projection system has the advantage of high imaging quality and equipment cost and space saving.
Description
Technical field
The present invention relates to a kind of optical projection system and correlation technique thereof that is used for presenting stereopsis, relate in particular to and a kind ofly carry out polarisation at image light respectively and handle, use the optical projection system and the correlation technique thereof that present stereopsis with respect to left eye visual angle and right eye visual angle.
Background technology
Generally speaking, the principle of work of stereopsis promptly is that the image that image that left eye is seen and right eye are seen is sent to left eye and right eye respectively, by the angle difference at right and left eyes visual angle, and make the received image of right and left eyes in user's brain, be superimposed as a stereopsis with the depth of field and stereovision.And common way is exactly to utilize different projection arrangements, a projection left eye visual angle image, another projection right eye visual angle image, left eye visual angle image and right eye visual angle image are the polarization light of different angles, be generally mutually orthogonal and (be the α degree as one, another is α+90 degree), two image light are projected on the display screen respectively, and are also had the polarization direction of mutually orthogonal by the image light that display screen reflected; The audience then can put on corresponding polaroid glasses, the principle of work of polaroid glasses is for utilizing the pairwise orthogonal polarized lenses respectively as left and right sides eyeglass, make audience's right and left eyes can only see the polarization light of α degree and α+90 respectively, the pairwise orthogonal polarized light that display screen reflected then can be respectively right and left eyes and receive, and then utilizes persistence of vision to act on to be superimposed as stereopsis in the brain.
Yet utilize different projection device to have following shortcoming: to use the bulky of two projectors and take up room with respect to the different angles polarization light of left eye visual angle image and right eye visual angle image; Increase hardware cost; Integrating two projectors must precision positioning, otherwise easily causes the image that is projected to display screen can't be perfect overlapping, and produces the situation generation that image dislocation or focal length do not wait; And, make the audience feel the image brilliance deficiency through its luminous flux meeting of light of polarization thereby minimizing, can't watch in the environment of extraneous brightness abundance etc.So how to design have high imaging quality and can save equipment cost and the optical projection system that presents stereopsis in mechanism space just is the important topic of the required effort of stereo display industry now.
Summary of the invention
The invention provides and a kind ofly carry out polarisation at image light respectively and handle, use the optical projection system and the correlation technique thereof that present stereopsis, to address the above problem with respect to left eye visual angle and right eye visual angle.
The present invention discloses a kind of optical projection system, and it includes a housing; One camera lens, it is used for projection image in a display screen; One image generation device, it is installed in this housing, this image generation device is used for alternately exporting one first group image light and exporting one second group image light in one second sequential in one first sequential, and this first group image light and this second group image light have different visual angle; One optics control module, it is installed in this housing, and this optics control module is used for reflecting this first group image light that this image generation device transmits or this second group image light to this camera lens; One polarisation unit, it is used for when rotating to one first angle polarisation and exports this first group image light, and polarisation is exported this second group image light when rotating to one second angle, and this first angle and this second angle differ 90 degree in fact; And a drive unit, it is installed in this housing, and this drive unit is used for driving this polarisation unit and rotates to this first angle or this second angle.
The present invention also discloses this image generation device and is used for alternately at this first sequential output this first group image light with respect to the left eye visual angle, and at this second sequential output this second group image light with respect to the right eye visual angle.
The present invention also discloses this image generation device image output light not outside this first sequential and this second sequential.
The present invention also discloses this image generation device and includes a light source, and it is used for producing image light; One assembles lens, and it is used for assembling the image light that this light source produces; One colour wheel, it is used for filtering the image light that this convergent lens transmits, to produce corresponding colored light beam; One integration rod, it is used for the colored light beam that even this colour wheel is transmitted; One collector lens, it is used for assembling the colored light beam that this integration rod transmits; And a prism lighting device, its colored light beam that is used for that this collector lens is transmitted reflexes to this optics control module.
It is a digital micro-mirror group assembly that the present invention also discloses this optics control module, and this first group image light that it is used for optionally reflecting this image generation device and is transmitted or this second group image light are to this camera lens.
It is a polaroid that the present invention also discloses this polarisation unit.
The present invention also discloses this polarisation unit and is installed between this camera lens and this display screen.
The present invention also discloses this polarisation unit and is incorporated into this camera lens.
The present invention also discloses on the surface that this polarisation unit is arranged at this camera lens.
It is a light polarizing film that the present invention also discloses this polarisation unit, and it is coated on this surface of this camera lens.
The present invention also discloses this polarisation unit and is formed on this surface of this camera lens in the mode of laser treatment.
It is a motor that the present invention also discloses this drive unit.
The present invention also discloses this optical projection system and includes one first polarized lenses in addition, and it is used for receiving and allows this display screen to reflect this first group image light that is transmitted this polarisation unit and passes through; And one second polarized lenses, it is arranged at this first polarized lenses, one side, and this second polarized lenses is used for receiving and allows this display screen to reflect this second group image light that is transmitted this polarisation unit and passes through.
The present invention also discloses this display screen and is made of aluminium matter or silver material.
It is a digital optical processing projector that the present invention also discloses this optical projection system.
The present invention also discloses a kind of method that is used for presenting stereopsis, and it includes the following step: export one first group image light to one camera lens in one first sequential; Rotate a polarisation unit to one first angle, use polarisation output by this first group image light to one display screen that this camera lens transmitted; One second sequential after this first sequential is exported one second group image light to this camera lens, and this first group image light and this second group image light have different visual angle; And rotate this polarisation unit to one second angle, use polarisation output by this second group image light that this camera lens transmitted to this display screen, this first angle and this second angle differ 90 degree in fact.
The present invention also be disclosed in the output of this first sequential with respect to this first group image light at left eye visual angle to this camera lens, and this second sequential output after this first sequential with respect to this second group image light at right eye visual angle to this camera lens.
The present invention also be disclosed in the output of this first sequential with respect to this first group image light at right eye visual angle to this camera lens, and this second sequential output after this first sequential with respect to this second group image light at left eye visual angle to this camera lens.
Be compared to prior art, the invention provides only needs a projection arrangement can reach the stereo projection system and the correlation technique thereof of stereo display effect, so can reduce the mechanism space effectively, save hardware cost, and can remove the restriction that two projectors must precision positioning, and improve through its luminous flux meeting of light of polarization thereby the problem that reduces, so the present invention has high imaging quality concurrently and can save equipment cost and the design of the optical projection system in mechanism space.
Description of drawings
Fig. 1 is the synoptic diagram of optical projection system that is used for presenting stereopsis of preferred embodiment of the present invention.
Fig. 2 presents the process flow diagram of stereopsis for the optical projection system of preferred embodiment of the present invention.
Fig. 3 is positioned at the synoptic diagram of first angle and second angle for the polarisation unit of preferred embodiment of the present invention.
Fig. 4 is the polarizing angle of polarisation unit under different sequential and the relation table of projection image's light of preferred embodiment of the present invention.
The primary clustering symbol description:
50 optical projection systems, 52 housings
54 camera lenses, 56 display screens
58 image generation devices, 581 light sources
582 convergent lenses, 583 colour wheels
584 integration rod, 585 collector lenses
586 diaphragms, 587 relay lenss
588 prism lighting devices, 60 optics control modules
62 polarisation unit, 64 drive units
66 first polarized lenses, 68 second polarized lenses
Embodiment
See also Fig. 1, Fig. 1 is the synoptic diagram of an optical projection system 50 that is used for presenting stereopsis of preferred embodiment of the present invention, optical projection system 50 can be a digital optical processing projector (digital light processing projector), optical projection system 50 includes a housing 52, it is used for coating intraware, a camera lens 54, and it can be installed on the housing 52, and camera lens 54 is used for projection image in a display screen 56, and an image generation device 58, it is installed in the housing 52.Display screen 56 can adopt by aluminium matter or the silver material that constitutes, and uses the polarized light property of keeping the image generation device 58 image light that produces.Image generation device 58 is used for image output light, image generation device 58 can comprise a light source 581, and assemble lens (converging lens) 582, one colour wheels 583 (color wheel), an integration rod (integration rod) 584, one collector lens (condenser lens) 585, one diaphragm (stop) 586, a relay lens (relay lens) 587, and a prism lighting device (prism illumination device) 588.Light source 581 is used for producing image light, the image light that convergent lens 582 convergent light sources 581 are produced is to colour wheel 583, colour wheel 583 is by a series of redness, green, blue filter constitutes, when colour wheel 583 twisted rotary shafts rotate, its a series of redness, green, blue filter can be tackled image light in regular turn, therefore, after image light passes through colour wheel 583, promptly convert corresponding colored light beam to, colored light beam is passed through integration rod 584 with uniform luminance subsequently, behind collector lens 585 and diaphragm 586, enter relay lens 587 again, be focused to prism lighting device 588 then.
See also Fig. 2, Fig. 2 is the process flow diagram that the optical projection system 50 of preferred embodiment of the present invention presents stereopsis, and Fig. 2 comprises the following steps:
Step 100: beginning.
Step 102: image generation device 58 is exported one first group image light to optics control module 60 in one first sequential (T1).
Step 104: optics control module 60 these first group image light of reflection are to camera lens 54.
Step 106: drive unit 64 drives polarisation unit 62 and rotates to one first angle, uses to make this first group image light that the 62 polarisations output of polarisation unit transmitted by camera lens 54 to display screen 56.
Step 108: use first polarized lenses 66 to receive and allow display screen 56 to reflect this first group image light that is transmitted polarisation unit 62 and pass through.
Step 110: image generation device 58 is image output light not.
Step 112: to optics control module 60, wherein this first group image light and this second group image light have different visual angle to image generation device 58 at one second sequential (T2) output, one second group image light.
Step 114: optics control module 60 these second group image light of reflection are to camera lens 54.
Step 116: drive unit 64 drives polarisation unit 62 and rotates to one second angle, use making this second group image light that 62 polarisations output in polarisation unit transmitted by camera lens 54 to display screen 56, wherein this first angle and this second angle differ 90 degree in fact.
Step 118: use second polarized lenses 68 to receive and allow display screen 56 to reflect this second group image light that is transmitted polarisation unit 62 and pass through.
Step 120: finish.
At this, a last flow process is described in detail: at first the image generation device 58 of optical projection system 50 can be exported this first group image light to optics control module 60 in this first sequential (T1), image generation device 58 can produce this first group image light by each intraware shown in Figure 1, be not described in detail in this, wherein this first group image light can be the polarization image light at corresponding left eye visual angle.Optics control module 60 these first group image light of reflection are to camera lens 54 afterwards, just can drive polarisation unit 62 with time drive unit 64 and rotate to this first angle, wherein when polarisation unit 62 is positioned at this first angle, polarisation unit 62 can allow this first group image light at the corresponding left eye visual angle transmitted by camera lens 54 all to pass through, and with this first group image ray cast to display screen 56, because display screen 56 can adopt by aluminium matter or the silver material that constitutes, so can keep the polarized light property of this first group image light, meaning promptly can not influence its polarized light property behind display screen 56 these first group image light of reflection.And hold the audience, because the audience wears the polaroid glasses in conjunction with first polarized lenses 66 and second polarized lenses 68, and wear in first polarized lenses 66 of left eye and can receive and allow this first group image light that display screen 56 reflection polarisation unit 62 are transmitted to pass through, so audience's left eye just can be seen the polarization light with respect to this first angle.
Next, when driving polarisation unit 62, drive unit 64 rotates in the process of this second angle by this first angle, image generation device 58 is not exported any image light, see image simultaneously by first polarized lenses 66 and second polarized lenses 68 respectively with the right and left eyes of avoiding the audience, and can't produce the effect of stereopsis.When drive unit 64 driving polarisation unit 62 rotate to this second angle, in this second sequential (T2), can export this second group image light to optics control module 60 with time image generation device 58, wherein this first sequential (T1) and this second sequential (T2) can or be equal time spacing not for the equal time spacing, decide on design requirement.Image generation device 58 can produce this second group image light by each intraware shown in Figure 1, just no longer describes in detail at this.Optics control module 60 these second group image light of reflection are to camera lens 54, wherein this first group image light and this second group image light have different visual angle, meaning is promptly when this first group image light is the polarization light of corresponding left eye, this second group image light is the polarization light of corresponding right eye, because left eye visual angle image and right eye visual angle image are the polarization light of different angles, be generally mutually orthogonal, event can design this first angle and this second angle differs 90 degree in fact, see also Fig. 3, Fig. 3 is positioned at the synoptic diagram of this first angle and this second angle for the polarisation unit 62 of preferred embodiment of the present invention.Wherein when polarisation unit 62 is positioned at this second angle, polarisation unit 62 can allow this second group image light at the corresponding right eye visual angle transmitted by camera lens 54 all to pass through, and with this second group image ray cast to display screen 56, because display screen 56 can adopt by aluminium matter or the silver material that constitutes, so can keep the polarized light property of this second group image light, meaning promptly can not influence its polarized light property behind display screen 56 these second group image light of reflection.In like manner, hold the audience, because the audience wears the polaroid glasses in conjunction with first polarized lenses 66 and second polarized lenses 68, and wear in second polarized lenses 68 of right eye and can receive and allow this second group image light that display screen 56 reflection polarisation unit 62 are transmitted to pass through, so audience's right eye just can be seen the polarization light with respect to this second angle.See also Fig. 4, Fig. 4 is the polarizing angle of polarisation unit 62 under different sequential and the relation table of projection image's light of preferred embodiment of the present invention, above-mentioned steps 102 to step 118 can repeat, meaning is that image generation device 58 is alternately exported with respect to the image light of left eye and at the image light of this second sequential (T2) output with respect to right eye in this first sequential (T1), and then produce a succession of pairwise orthogonal polarization light that replaces, and in different sequential, received by right and left eyes respectively, utilize persistence of vision to act at last and be superimposed as stereopsis in the brain.
In sum, because this first angle and this second angle differ 90 degree in fact, so make audience's left eye and right eye in this first sequential (T1) and this second sequential (T2), only can see the polarization light of α degree and α+90 respectively, and then utilize persistence of vision to act on to be superimposed as stereopsis in the brain.And in the above-described embodiments, this first group image light that image generation device 58 is produced in this first sequential (T1) also can be the polarization image light at corresponding right eye visual angle, this second group image light that this moment, image generation device 58 was produced in this second sequential (T2) just is the polarization image light at corresponding left eye visual angle accordingly, its action principle is same as previous embodiment, just no longer describes in detail at this.
In addition, polarisation unit 62 except can for a stand-alone assembly and be installed on camera lens 54 and the mechanism design of 56 of display screens, polarisation unit 62 also can be incorporated into camera lens 54, for example be sheathed on the camera lens 54, and with camera lens 54 synchronization actions, meaning promptly can be utilized drive unit 64 driven in synchronism polarisation unit 62 and camera lenses 54; Polarisation unit 62 or can be arranged on the surface of camera lens 54, for example polarisation unit 62 is a light polarizing film, it is coated on the surface of camera lens 54, or polarisation unit 62 is formed on the surface of camera lens 54 in the mode of laser treatment, so also can utilize drive unit 64 driven in synchronism polarisation unit 62 and camera lenses 54.In sum, so long as utilize the optionally image light that transmitted of output lens 54 category that all belongs to the present invention and protected of polarisation unit 62.
Be compared to prior art, the invention provides only needs a projection arrangement can reach the stereo projection system and the correlation technique thereof of stereo display effect, so can reduce the mechanism space effectively, save hardware cost, and can remove the restriction that two projectors must precision positioning, and improve through its luminous flux meeting of light of polarization thereby the problem that reduces, so the present invention has high imaging quality concurrently and can save equipment cost and the design of the optical projection system in mechanism space.
The above only is preferred embodiment of the present invention, and all claims scope is done according to the present invention equivalent variations and modification all should belong to the covering scope of patent of the present invention.
Claims (20)
1. optical projection system that is used for presenting stereopsis comprises:
One housing;
One camera lens is used for projection image in a display screen;
One image generation device, be installed in the described housing, described image generation device is used for alternately exporting one first group image light and exporting one second group image light in one second sequential in one first sequential, and described first group image light and the described second group image light have different visual angle;
One optics control module is installed in the described housing, and described optics control module is used for reflecting the described first group image light that described image generation device transmits or the described second group image light to described camera lens;
One polarisation unit, be used for when rotating to one first angle that polarisation is exported the described first group image light and when rotating to one second angle polarisation export the described second group image light, described first angle and described second angle differ 90 degree in fact; And
One drive unit is installed in the described housing, and described drive unit is used for driving described polarisation unit and rotates to described first angle or described second angle.
2. optical projection system as claimed in claim 1, wherein said image generation device are used for alternately exporting with respect to the described first group image light at left eye visual angle and at the described second group image light of described second sequential output with respect to the right eye visual angle in described first sequential.
3. optical projection system as claimed in claim 1, wherein said image generation device image output light not outside described first sequential and described second sequential.
4. optical projection system as claimed in claim 1, wherein said image generation device comprises:
One light source is used for producing image light;
One assembles lens, is used for assembling the image light that described light source produces;
One colour wheel is used for filtering the image light that described convergent lens transmits, to produce corresponding colored light beam;
One integration rod is used for the colored light beam that even described colour wheel transmitted;
One collector lens is used for assembling the colored light beam that described integration rod transmits; And
One prism lighting device, the colored light beam that is used for that described collector lens is transmitted reflexes to described optics control module.
5. optical projection system as claimed in claim 1, wherein said optics control module are a digital micro-mirror group assembly, and described first group image light that is used for optionally reflecting described image generation device and is transmitted or the described second group image light are to described camera lens.
6. optical projection system as claimed in claim 1, wherein said polarisation unit is a polaroid.
7. optical projection system as claimed in claim 1, wherein said polarisation unit is installed between described camera lens and the described display screen.
8. optical projection system as claimed in claim 1, wherein said polarisation unit is incorporated into described camera lens.
9. optical projection system as claimed in claim 1, wherein said polarisation unit is arranged on the surface of described camera lens.
10. optical projection system as claimed in claim 9, wherein said polarisation unit is a light polarizing film, coats on the described surface of described camera lens.
11. optical projection system as claimed in claim 9, wherein said polarisation unit is formed on the described surface of described camera lens in the mode of laser treatment.
12. optical projection system as claimed in claim 1, wherein said drive unit are a motor.
13. optical projection system as claimed in claim 1, it also comprises:
One first polarized lenses is used for receiving and allows described display screen to reflect the described first group image light that is transmitted described polarisation unit and passes through; And
One second polarized lenses is arranged at a side of described first polarized lenses, and described second polarized lenses is used for receiving and allows described display screen to reflect the described second group image light that is transmitted described polarisation unit and passes through.
14. optical projection system as claimed in claim 1, wherein said display screen is made of aluminium matter or silver material.
15. optical projection system as claimed in claim 1 is a digital optical processing projector.
16. a method that is used for presenting stereopsis comprises:
Export one first group image light to one camera lens in one first sequential;
Rotate a polarisation unit to one first angle, use polarisation output by described first group image light to one display screen that described camera lens transmitted;
One second sequential after described first sequential is exported one second group image light to described camera lens, and described first group image light and the described second group image light have different visual angle; And
Rotate described polarisation unit to one second angle, use polarisation output by the described second group image light that described camera lens transmitted to described display screen, described first angle and described second angle differ 90 degree in fact.
17. method as claimed in claim 16, wherein described first sequential export the described first group image light to the step of described camera lens be included in described first sequential output with respect to the described first group image light at left eye visual angle to described camera lens, and described second sequential after described first sequential export described second sequential output after the described second group image light to the step of described camera lens is included in described first sequential with respect to the described second group image light at right eye visual angle to described camera lens.
18. method as claimed in claim 16, wherein described first sequential export the described first group image light to the step of described camera lens be included in described first sequential output with respect to the described first group image light at right eye visual angle to described camera lens, and described second sequential after described first sequential export described second sequential output after the described second group image light to the step of described camera lens is included in described first sequential with respect to the described second group image light at left eye visual angle to described camera lens.
19. method as claimed in claim 16 also is included in outside described first sequential and described second sequential not image output light.
20. the method for claim 1 also comprises:
Using one first polarized lenses to receive and allow described display screen to reflect the described first group image light that is transmitted described polarisation unit passes through; And
Using one second polarized lenses to receive and allow described display screen to reflect the described second group image light that is transmitted described polarisation unit passes through.
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| CN200810171899A CN101738737B (en) | 2008-11-17 | 2008-11-17 | Projection system used for presenting stereoscopic image and method thereof |
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| CN200810171899A CN101738737B (en) | 2008-11-17 | 2008-11-17 | Projection system used for presenting stereoscopic image and method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103080837A (en) * | 2010-08-24 | 2013-05-01 | 欧司朗股份有限公司 | Projection device and method for operating a projection device |
| CN103995426A (en) * | 2014-05-29 | 2014-08-20 | 清华大学深圳研究生院 | Stereographic projection display device |
| TWI464520B (en) * | 2012-12-28 | 2014-12-11 | Delta Electronics Inc | Light source system for stereoscopic image |
| CN104808430A (en) * | 2014-01-27 | 2015-07-29 | 台达电子工业股份有限公司 | Time multitask multi-view projection device |
| CN107516493A (en) * | 2014-09-17 | 2017-12-26 | 康江辉 | A kind of image display system and its method |
| CN107884934A (en) * | 2017-11-10 | 2018-04-06 | 联想(北京)有限公司 | Head-mounted display apparatus and its control method |
| CN108737804A (en) * | 2018-05-20 | 2018-11-02 | 广州极智未来科技有限公司 | A kind of short focus polarization optical projection device |
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| CN110908227A (en) * | 2018-09-17 | 2020-03-24 | 中强光电股份有限公司 | Polarization rotation device and projection device |
| WO2021203265A1 (en) * | 2020-04-08 | 2021-10-14 | 深圳市光科全息技术有限公司 | Projection screen and projection system |
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| US8172399B2 (en) * | 2005-12-21 | 2012-05-08 | International Business Machines Corporation | Lumen optimized stereo projector using a plurality of polarizing filters |
| CN200997044Y (en) * | 2006-12-30 | 2007-12-26 | 上海广电光显技术有限公司 | Optical engine with display mode inter-switching function |
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| CN103080837A (en) * | 2010-08-24 | 2013-05-01 | 欧司朗股份有限公司 | Projection device and method for operating a projection device |
| US9140966B2 (en) | 2010-08-24 | 2015-09-22 | Osram Gmbh | Projection device and method for operating a projection device |
| CN103080837B (en) * | 2010-08-24 | 2016-04-20 | 欧司朗股份有限公司 | Projection arrangement and for driving the method for projection arrangement |
| TWI464520B (en) * | 2012-12-28 | 2014-12-11 | Delta Electronics Inc | Light source system for stereoscopic image |
| CN104808430A (en) * | 2014-01-27 | 2015-07-29 | 台达电子工业股份有限公司 | Time multitask multi-view projection device |
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| CN107884934B (en) * | 2017-11-10 | 2022-05-31 | 联想(北京)有限公司 | Head-mounted display device and control method thereof |
| CN108737804A (en) * | 2018-05-20 | 2018-11-02 | 广州极智未来科技有限公司 | A kind of short focus polarization optical projection device |
| CN109300418A (en) * | 2018-09-06 | 2019-02-01 | 优伟森传媒科技（苏州）有限公司 | A kind of new media put-on method and system |
| CN109300418B (en) * | 2018-09-06 | 2020-01-21 | 南京帅举电子科技有限公司 | Novel media delivery method and system |
| CN110908227A (en) * | 2018-09-17 | 2020-03-24 | 中强光电股份有限公司 | Polarization rotation device and projection device |
| CN110908227B (en) * | 2018-09-17 | 2022-03-08 | 中强光电股份有限公司 | Polarization rotation device and projection device |
| US11467479B2 (en) | 2018-09-17 | 2022-10-11 | Coretronic Corporation | Polarizing rotation device and projection device |
| WO2021203265A1 (en) * | 2020-04-08 | 2021-10-14 | 深圳市光科全息技术有限公司 | Projection screen and projection system |
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