CN102841448B - Imaging method of stereoscopic display based on multi-screen imaging - Google Patents
Imaging method of stereoscopic display based on multi-screen imaging Download PDFInfo
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Abstract
The invention discloses an imaging method of a stereoscopic display based on multi-screen imaging. The stereoscopic display comprises an all-phase spatial light modulator (1), a convex lens (2), a spatial filter (6), a first projection screen (3), a second projection screen (4) and a third projection screen (5) which are arranged sequentially. The method is characterized in that input coherent light sources are modulated as a phase hologram by the all-phase light modulator (1); the phase hologram firstly passes through the convex lens (2) in space, then passes through the spatial filter (6) so as to be filtered, and finally the phase hologram is imaged clearly on the first projection screen (3), the second projection screen (4) and the third projection screen (5) at different places, wherein the first projection screen (3), the second projection screen (4) and the third projection screen (5) take turns in a scattering period in a time division way; and the phase hologram is obtained by Fourier transform calculation of a fractional order.
Description
Technical field
The present invention relates to a kind of real tri-dimension display, especially relate to a kind of on multi-screen the real tri-dimension display of line holographic projections.
Background technology
The stereo display technique of binocular parallax type is transferred to the two width images with parallax information respectively people's right and left eyes by optical devices, human visual system is after receiving this anaglyph, in brain, further merge and process, thereby perceiving three-dimensional information.Yet this steric information and human eye are watched the true three-dimension object of occurring in nature or differentiated.Be mainly the problem that exists simple eye focus point not overlap with eyes convergent point, human eye has the image of parallax information in order to see two width clearly, and two need focus on the display screen that shows this two width anaglyph; On the other hand, due to the existence of parallax information, Human Perception to object may be positioned at the forward and backward side of display screen, corresponding eyes convergent point is positioned at the forward and backward side of screen.The inconsistent meeting of this focus point and convergent point brings visual fatigue.
Visual fatigue problem is the technical barrier that binocular parallax type stereo display technique cannot overcome.One of method solving is in the light field information of three dimensions true reappearance object, adopts real tri-dimension display technique.Real tri-dimension display technique can be divided into three classes: holographic demonstration, body show, integration imaging shows.Wherein, body display technique is rebuild the optical field distribution of object at three dimensions, possesses the viewing effect of wide angular field of view.A kind of technical scheme of body display technique is the locational image of the different depth of field of difference projection three-dimensional object on a plurality of screens that adopts the timesharing of high speed projector, utilize the persistence of vision of human eye, the image on a plurality of screens is at the synthetic complete three-dimensional scenic of three dimensions.A shortcoming of technique scheme is, Dang Yongyige projector is on a plurality of screens during timesharing projection different images content, optical lens system before projector must be according to the position of projection screen, thereby the synchronous change focal length of lens guarantees that projected image focuses on screen clearly, especially when the screen of projection is more, the display frame rate synchronised of above-mentioned optical lens system Xu Yu projector, makes zoom at a high speed.The high speed zoom of this optical lens system has increased the complexity of whole system, and cost is expensive, focusing low precision.
In order to overcome existing body, show that the optics high speed zoom system, pancreatic system existing is complicated, success is expensive, the problems such as focusing low precision, the present invention proposes a kind of body display technique based on line holographic projections, line holographic projections can realize the clear projection imaging of arbitrary plane position epigraph, and without optical focal distance setting system at a high speed.In addition, line holographic projections can be directly in three dimensions projection imaging, thereby without the mode that adopts timesharing, effectively reduces complexity and the cost of optical projection system.
Summary of the invention
technical matters: in order to solve the problems such as the optics high speed optical projection system complexity that existing said three-dimensional body display exists is high, figure image focu is poor, cost is expensive, the invention provides a kind of formation method of the said three-dimensional body display based on line holographic projections, this display adopts line holographic projections machine to carry out projection to a plurality of screens, without optical focal distance setting system at a high speed, figure image focu sharpness is high.
technical scheme: a kind of three-dimensional display of multi-screen imaging, its light channel structure is: full phase spatial light modulator is modulated into phase hologram by the coherent source of input, first phase hologram passes through convex lens in space, then through spatial filter, carry out filtering, finally on the projection screen of a plurality of diverse locations, distinguish blur-free imaging, a plurality of projection screens adopt the mode of timesharing in the rotation of scattering states cycle, and phase hologram adopts fraction Fourier conversion to calculate and obtains.
This three-dimensional display comprises full phase spatial light modulator, convex lens, spatial filter, the first projection screen, the second projection screen, the 3rd projection screen that order arranges;
Full phase spatial light modulator is modulated into phase hologram by the coherent source of input, first phase hologram passes through convex lens in space, then through spatial filter, carry out filtering, difference blur-free imaging on last the first projection screen at diverse location, the second projection screen, the 3rd projection screen, the first projection screen, the second projection screen, the 3rd projection screen adopt the mode of timesharing in the rotation of scattering states cycle, and phase hologram adopts fraction Fourier conversion to calculate and obtains.
Full phase spatial light modulator shows respectively the first projection screen, the second projection screen, hologram corresponding to the 3rd projection screen by the mode of timesharing, it is synchronous with corresponding projection screen that synchronization control circuit is controlled hologram display cycle of full phase spatial light modulator, interior corresponding screen of display cycle is in scattering states, and other screen is in clear state.
The hologram that full phase spatial light modulator shows is synthetic by the method for cumulative iteration, cumulative alternative manner is synthesized to hologram corresponding to a plurality of projection screens in one width hologram, in the display cycle of one width hologram of full phase spatial light modulator, the first projection screen, the second projection screen, the 3rd projection screen adopt the mode of timesharing in the rotation of scattering states cycle.
The hologram that full phase spatial light modulator shows is synthetic by clinoplane computing method, in the display cycle of one width hologram of full phase spatial light modulator, the first projection screen, the second projection screen, the 3rd projection screen adopt the mode of timesharing in the rotation of scattering states cycle.
Full phase spatial light modulator comprises red laser, green laser, blue laser, full phase space optical modulator chip, Amici prism, Amici prism, Amici prism and collimation lens;
Red laser, green laser, blue laser adopts the mode of timesharing to share same full phase spatial light modulator, and is coupled by Amici prism.
Adopt three full phase space optical modulator chips respectively to red laser, green laser, blue laser is modulated, and by Amici prism, Amici prism, Amici prism and collimation lens are coupled.
beneficial effect: the invention has the beneficial effects as follows, adopt line holographic projections to realize the projection imaging of three dimensions diverse location screen, the clear projection process of diverse location screen picture adopts fraction Fourier conversion to realize, without adopting optics high speed zoom system, pancreatic system, effectively reduce the complexity of system, improve the sharpness of projected image, reduced the cost of system.
Accompanying drawing explanation
It shown in Fig. 1, is the preferably said three-dimensional body display structure schematic diagram based on line holographic projections of the present invention.
Shown in Fig. 2, be the driving voltage waveform figure of a plurality of polymer stabilized nematic liquid crystals screens.
It shown in Fig. 3, is the optical system structure schematic diagram of the preferred color hologram projection of the present invention.
In figure, have: full phase spatial light modulator 1, convex lens 2, the first projection screen 3, the second projection screen 4, the 3rd projection screen 5, spatial filter 6, full phase space optical modulator chip 7, Amici prism 8, Amici prism 9, Amici prism 10, red laser 11, green laser 12, blue laser 13, collimation lens 14.
Embodiment
Shown in Fig. 1, be the preferably body display structure based on line holographic projections of the present invention, comprising full phase spatial light modulator 1, convex lens 2, the first projection screen 3, the second projection screen 4, the 3rd projection screen 5, spatial filter 6.Full phase spatial light modulator 1 can adopt full phase-modulation LCoS, full phase-modulation LCoS only modulates the phase place of input coherent source, by the full phase hologram of dynamic load video, can realize the dynamic demonstration of video image, the coherent light of the full phase-modulation LCoS of process is at spatial l
1after distance, through convex lens 2, convex lens 2 can be ordinary optical convex lens herein, or Fresnel lens, different from traditional optical optical projection system, convex lens 2 are simple lenses of simple fixed focal length, without zoom at a high speed dynamically, coherent light through convex lens 2 at spatial apart from l
2after, arrive successively the first projection screen 3, the second projection screen 4, the 3rd projection screen 5, in actual system, can further increase as required the number of projection screen, thereby improve the three dimensions optical field distribution that true said three-dimensional body shows, the first projection screen 3, the second projection screen 4, the 3rd projection screen 5 can adopt polymkeric substance to mix LCD screen, polymkeric substance mixes LCD screen can be operated in two states in the situation that powering up and not powering up: clear state and scattering states, in the preferred structure of the present invention, by synchronization control circuit, control the first projection screen 3, the second projection screen 4, conversion between the 3rd projection screen 5 two states and synchronous, by synchronization control circuit, make the first projection screen 3, the second projection screen 4, the 3rd projection screen 5 timesharing in clear state and scattering states, in any one time, only has a screen in scattering states, other screen is all in clear state, for example, the first projection screen 3 is when scattering states, other screen is in clear state, the hologram that now full phase spatial light modulator produces is imaged on the first projection screen 3.Utilize the persistence of vision effect of human eye, the first projection screen 3, the second projection screen 4, the 3rd projection screen 5 timesharing in scattering image formation state, thereby make human eye see three-dimensional reconstruction image on a plurality of screens of three dimensions.
Shown in Fig. 1 in preferred structure of the present invention, full phase spatial light modulator 1 adopts phase hologram to carry out the projection imaging of a plurality of screens in implementation space, phase hologram on full phase spatial light modulator 1 can adopt the method for fraction Fourier conversion iteration to realize the projection (list of references 1: " Holographic image projection using fractional Fourier transformation " of different screen epigraph, OPTICS COMMUNICATIONS, volume: 285, phase: 1, page: 24-28, 2012), the first projection screen 3 on diverse location, the second projection screen 4, the 3rd projection screen 5 correspondences the different rank of fraction Fourier conversion, therefore in order to realize the projection of diverse location image on screen, a kind of method is, first calculate the fraction Fourier conversion hologram that diverse location screen is corresponding, then by synchronization control circuit, make the hologram and the first projection screen 3 that on full phase spatial light modulator 1, show, the second projection screen 4, the scattering states of the 3rd projection screen 5 is synchronous, while being the hologram of full phase spatial light modulator 1 demonstration the first projection screen 3 correspondences, the first projection screen 3 synchronous in scattering states, and other screen is in clear state, now realize the line holographic projections imaging on the first projection screen 3, by that analogy, mode by timesharing can be successively at the second projection screen 4, on the 3rd projection screen 5, realize line holographic projections, second method is, adopt the mode (list of references 2: " Three-dimensional light modulation using phase-only spatial light modulator " of many plane holograms imaging simultaneously, OPTICAL ENGINEERING, volume: 48, phase: 2, document number: 020502, 2009), it is projection screen 3, 4 and 5 fraction Fourier conversion hologram is by the synthetic same width hologram of method of cumulative iteration, it is projection screen 3, 4 and 5 hologram adds up in full phase face in iterative process, the common iteration (list of references 2) that participates in, the hologram now generating can be simultaneously at the first projection screen 3, the second projection screen 4, on the 3rd projection screen 5, carry out projection imaging, can blur-free imaging in order to realize on each screen, now still need the first projection screen 3, the second projection screen 4, the 3rd projection screen 5 timesharing be operated in scattering states, be to only have a screen each time period in scattering states, other is all in clear state, the third method is, hologram adopts clinoplane computing method (list of references 3: " Computer-generated holograms for three-dimensional surface objects with shade and texture ", APPLIED OPTICS, volume: 44, phase: 22, page: 4607-4614, 2005) at three dimensions generating three-dimensional stereopsis, the first projection screen 3, the second projection screen 4, the 3rd projection screen 5 still adopts time-sharing format to be operated in scattering states, be to only have a screen each time period in scattering states, other is all in clear state.
Spatial filter 6 in Fig. 1 is for improving the image quality of line holographic projections, and spatial filter 6 is preferably placed on the back focal plane of convex lens 2, thus the unwanted zero order wave of filtering easily and higher-order wave.
Shown in Fig. 2, be the control waveform of the preferred synchronization control circuit of the present invention to projection screen, output 1, output 2 and output 3 is corresponding the first projection screen 3, the second projection screen 4, the 3rd projection screen 5 respectively.
In order to realize the projection of color hologram image, the preferred technical scheme of the present invention as shown in Figure 3, adopt red laser 11, green laser 12, blue laser 13 is respectively by Amici prism 8, Amici prism 9, Amici prism 10 timesharing on same full phase space optical modulator chip 7 is modulated, preferred the second technical scheme of the present invention is to adopt three full phase space optical modulator chips to modulate respectively three look laser, and be coupled by Amici prism, it can also be the combination of above-mentioned two schemes, for example adopt two full phase space optical modulator chips, the laser to two kinds of colors of one of them chip timesharing is modulated, another one chip is modulated the third color, and by Amici prism, three look holograms are coupled.
Phase hologram on full phase spatial light modulator 1 shown in Fig. 1 can also adopt the method for traditional Fresnel diffraction to calculate.
Claims (6)
1. a formation method for the three-dimensional display of multi-screen imaging, is characterized in that: this three-dimensional display comprises full phase spatial light modulator (1), convex lens (2), spatial filter (6), the first projection screen (3), the second projection screen (4), the 3rd projection screen (5) that order arranges;
Full phase spatial light modulator (1) is modulated into phase hologram by the coherent source of input, first phase hologram passes through convex lens (2) in space, then pass through spatial filter (6) and carry out filtering, last the first projection screen (3) at diverse location, the second projection screen (4), the upper blur-free imaging respectively of the 3rd projection screen (5), the first projection screen (3), the second projection screen (4), the 3rd projection screen (5) adopt the mode of timesharing in the rotation of scattering states cycle, and phase hologram adopts fraction Fourier conversion to calculate and obtains.
2. the formation method of the three-dimensional display of a kind of multi-screen imaging according to claim 1, it is characterized in that: full phase spatial light modulator (1) shows respectively the hologram of the first projection screen (3), the second projection screen (4), the 3rd projection screen (5) correspondence by the mode of timesharing, it is synchronous with corresponding projection screen that synchronization control circuit is controlled hologram display cycle of full phase spatial light modulator (1), interior corresponding screen of display cycle is in scattering states, and other screen is in clear state.
3. the formation method of the three-dimensional display of a kind of multi-screen imaging according to claim 1, it is characterized in that: the hologram that full phase spatial light modulator (1) shows is synthetic by the method for cumulative iteration, cumulative alternative manner is synthesized to hologram corresponding to a plurality of projection screens in one width hologram, in the display cycle of one width hologram of full phase spatial light modulator (1), the first projection screen (3), the second projection screen (4), the 3rd projection screen (5) adopt the mode of timesharing in the rotation of scattering states cycle.
4. the formation method of the three-dimensional display of a kind of multi-screen imaging according to claim 1, it is characterized in that: the hologram that full phase spatial light modulator (1) shows is synthetic by clinoplane computing method, in the display cycle of one width hologram of full phase spatial light modulator (1), the first projection screen (3), the second projection screen (4), the 3rd projection screen (5) adopt the mode of timesharing in the rotation of scattering states cycle.
5. the formation method of the three-dimensional display of a kind of multi-screen imaging according to claim 1, is characterized in that: full phase spatial light modulator (1) comprises red laser (11), green laser (12), blue laser (13), full phase space optical modulator chip (7), the first Amici prism (8), the second Amici prism (9), the 3rd Amici prism (10) and collimation lens (14);
Red laser (11), green laser (12), blue laser (13) adopt the mode of timesharing to share same full phase spatial light modulator (1), and are coupled by Amici prism.
6. the formation method of the three-dimensional display of a kind of multi-screen imaging according to claim 1, it is characterized in that: adopt three full phase space optical modulator chips (7) respectively to red laser (11), green laser (12), blue laser (13) is modulated, and by the first Amici prism (8), the second Amici prism (9), the 3rd Amici prism (10) and collimation lens (14) are coupled.
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| CN110554593A (en) * | 2018-05-31 | 2019-12-10 | 京东方科技集团股份有限公司 | Holographic optical element, manufacturing method thereof, image reconstruction method and augmented reality glasses |
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| GB2517069B (en) * | 2014-06-23 | 2015-09-02 | Liang Kong | Autostereoscopic virtual reality platform |
| CN106873169A (en) * | 2015-12-10 | 2017-06-20 | 上海交通大学 | Three dimensional display |
| CN105549212B (en) * | 2016-02-29 | 2018-04-10 | 京东方科技集团股份有限公司 | A kind of three-dimensional display system and its method for realizing Three-dimensional Display |
| CN114326128A (en) * | 2017-02-21 | 2022-04-12 | 脸谱科技有限责任公司 | Focus adjustment multi-plane head-mounted display |
| CN108628077A (en) * | 2018-01-31 | 2018-10-09 | 陈念 | Scatter projection device |
| CN108803029A (en) * | 2018-05-14 | 2018-11-13 | 成都理想境界科技有限公司 | Display module and the display equipment for using the display module |
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