CN112596239A - Holographic near-eye display method and system based on spatial light modulator - Google Patents
Holographic near-eye display method and system based on spatial light modulator Download PDFInfo
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- CN112596239A CN112596239A CN202011529327.XA CN202011529327A CN112596239A CN 112596239 A CN112596239 A CN 112596239A CN 202011529327 A CN202011529327 A CN 202011529327A CN 112596239 A CN112596239 A CN 112596239A
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
- G02B2027/0174—Head mounted characterised by optical features holographic
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Abstract
The invention provides a holographic near-to-eye display method and a holographic near-to-eye display system based on a spatial light modulator, which comprise the following steps: the device comprises a control module, a light source, a polaroid, a first spectroscope, a Spatial Light Modulator (SLM), a lens group, a diaphragm, a lens group and a second spectroscope; calculating three-dimensional image information to be displayed into a two-dimensional hologram by a control module through a holographic algorithm, outputting and loading the two-dimensional hologram to a spatial light modulator for displaying, and synchronously controlling a point light source to emit light; divergent light emitted by the light source penetrates through the polaroid, is reflected by the first beam splitter and then upwards transmitted, is collimated into parallel light by the lens group and is incident on the spatial light modulator; after being modulated by the spatial light modulator, the reflected and diffracted three-dimensional imaging light beams pass through a field angle amplifying system formed by a lens group, a diaphragm and a lens group and then are reflected by a second beam splitter to enter human eyes, so that the human eyes observe virtual three-dimensional image information. Meanwhile, the light beam of the external environment can enter the human eye through the spectroscope.
Description
Technical Field
The invention relates to the technical field of AR (augmented reality) display, in particular to a holographic near-to-eye display method and system based on a spatial light modulator.
Background
At present, the near-eye AR display technology mainly adopts OLED (organic light emitting diode) screens, LCos screens and the like, the provided image source is a two-dimensional image, the three-dimensional image display effect is realized by a binocular parallax technology, and the binocular vergence adjustment and the visual refraction adjustment are not matched inevitably, so that visual fatigue is generated. The holographic three-dimensional display technology is a true three-dimensional display technology, can completely record and reconstruct a light field of a three-dimensional object, and provides all information required by a human visual system.
Patent document CN201922043259.5 discloses an AR display device, which includes a waveguide lens and an antireflection film for reducing reflected light entering the waveguide lens through multiple foldback, the waveguide lens includes a waveguide, and a coupling-in region and a coupling-out region disposed on the same side surface of the waveguide, the antireflection film is attached to the surface of the waveguide far away from the coupling-in region and at least shields the coupling-in region, and image light enters the waveguide lens through the antireflection film and then is output to human eyes through total reflection. The patent also discloses AR display system, including image processing device, projection arrangement and above-mentioned AR display device, image processing device output image light to projection arrangement, and image light is incident to AR display device after projection arrangement adjusts, exports to the people's eye through AR display device total reflection again. The anti-reflection film is tightly attached to the surface of one side, far away from the coupling-in area, of the waveguide, and at least shields the coupling-in area, so that the phenomenon that reflected light enters the waveguide lens through multiple turn-back is reduced, the visual problem caused by reflected light is avoided, and the viewing experience is greatly improved. There is still room for improvement in structural and technical performance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a holographic near-eye display method and system based on a spatial light modulator.
According to the invention, the holographic near-eye display system based on the spatial light modulator comprises: a control module 11, a light source 12, a polarizer 13, a first beam splitter 14, a spatial light modulator SLM15, a first lens group 16, a diaphragm 17, a second lens group 18 and a second beam splitter 19;
calculating three-dimensional image information to be displayed into a two-dimensional hologram by a holographic algorithm by using a control module 11, outputting the two-dimensional hologram to be loaded on a spatial light modulator 15 for display, and synchronously controlling a light source 12 to emit light;
divergent light emitted by the light source 12 penetrates through the polarizing plate 13, is reflected by the first beam splitter 14, then propagates upwards, is collimated into parallel light by the first lens group 16, and is incident on the spatial light modulator 15;
after being modulated by the spatial light modulator 15, the reflected and diffracted three-dimensional imaging light beam passes through a field angle amplifying system formed by the first lens group 16, the diaphragm 17 and the second lens group 18, and then is reflected by the second beam splitter 19 to enter human eyes, so that the human eyes can observe virtual three-dimensional image information. Meanwhile, the light beam of the external environment can enter the human eye through the beam splitter 19.
Preferably, the control module 11 is capable of performing hologram calculation and loading of image information, and spatial light modulation and light source control.
Preferably, the control module 11 comprises: the device comprises a main control unit, a control program interface unit, an external communication interface, a hologram calculation unit, a storage unit, an SLM driving unit and a light source driving unit.
The main control unit is respectively connected with the storage unit, the control program interface unit, the hologram calculation unit, the external communication interface and the SLM driving unit.
The main control unit completes the control work of the whole system; the control program interface mainly provides a human-computer interface; the external communication interface mainly comprises wired interfaces such as video and data, or wireless interfaces such as wireless, Bluetooth and infrared interfaces for receiving external data; the hologram calculation unit generates a hologram from the corresponding three-dimensional image information or data through a hologram algorithm, and outputs the hologram to the spatial light modulator driving unit through the main control unit, so that the spatial light modulator is driven to modulate the light beam incident on the spatial light modulator driving unit to output the corresponding three-dimensional image information; the main control unit can also output and display the hologram which is stored in advance by the internal or external storage unit to the spatial light modulator; the main control unit can realize synchronous driving of the spatial light modulator and the light source.
Preferably, the light source 12 is a point light source;
the light beam emitted by the light source 12 is divergent spherical light, is reflected by the first beam splitter 14, is collimated into parallel light by the first lens group 16, and is incident on the spatial light modulator 15;
preferably, the light source 12 adopts any one of the following:
-a laser light source with coherence;
-an LED light source with a set coherence.
Preferably, the spatial light modulator 15 is a reflective spatial light modulator.
Preferably, the field angle magnifying system can be used for magnifying the imaging field of view, and as shown in fig. 3, is composed of a first lens group 16, a stop 17 and a second lens group 18.
Preferably, the focal length f of the first lens group 161Greater than the focal length f of the second lens group 182The distance between the first lens group 16 and the second lens group 18 is f1+f2Magnification of field angle f1/f2。
Preferably, in the viewing angle enlarging system, in order to enlarge the exit pupil distance S of the display system2Distance S between spatial light modulator 15 and first lens group 161Is smaller than the focal length f of the first lens group 161Distance of exit pupil S2Can be represented as S2＝f2+f2·(f2/f1)-(f2/f1)2·S1，S1The smaller the exit pupil distance S2The larger.
The diaphragm 17 is located on the fourier transform surface of the first lens group 16, and interference of multi-order diffraction images and zero-order image imaging can be filtered out by designing a corresponding aperture diaphragm.
The first lens group 16 is a front lens group of the imaging magnification system, and has a function of collimating divergent light into parallel light.
According to the holographic near-eye display method based on the spatial light modulator, the holographic near-eye display system based on the spatial light modulator is adopted to perform holographic near-eye display based on the spatial light modulator.
Compared with the prior art, the invention has the following beneficial effects:
1. the patent provides a holographic near-eye AR display system based on a spatial light modulator, intensity information and depth information of a three-dimensional image are calculated into a common two-dimensional hologram through a holographic algorithm and loaded onto a liquid crystal spatial light modulator;
2. the invention can project a three-dimensional image with real depth of field information by utilizing the phase modulation capability of the spatial light modulator, thereby eliminating the visual fatigue of human eyes;
3. the three-dimensional object optical field reconstruction method can record and reconstruct the optical field of the three-dimensional object completely and provide all information required by a human eye vision system.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic diagram of a holographic AR display system based on a spatial light modulator according to the present invention.
Fig. 2 is a schematic diagram of a control module in an embodiment provided in the present invention.
Fig. 3 is a schematic view of a field angle magnifying system in an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 1-3, a spatial light modulator-based holographic AR display system includes a control module 11, a light source 12, a polarizer 13, a beam splitter 14, a spatial light modulator SLM15, a first lens group 16, a stop 17, a second lens group 18, and a beam splitter 19.
Firstly, the control module 11 calculates three-dimensional image information to be displayed into a two-dimensional hologram through a holographic algorithm, outputs the two-dimensional hologram to be loaded on the spatial light modulator 15 for display, and synchronously controls the light source 12 to emit light. Divergent light emitted from the light source 12 passes through the polarizing plate 13, is reflected by the beam splitter 14, propagates upward, is collimated into parallel light by the first lens group 16, and is incident on the spatial light modulator 15. After being modulated by the spatial light modulator 15, the reflected and diffracted three-dimensional imaging light beam passes through a field angle amplifying system formed by the first lens group 16, the diaphragm 17 and the second lens group 18, and then is reflected by the spectroscope 19 to enter human eyes, so that the human eyes observe virtual three-dimensional image information. Meanwhile, the light beam of the external environment can enter the human eye through the beam splitter 19.
The control module 11 mainly completes the calculation and loading of the hologram of the image information, the spatial light modulation and the control of the light source. As shown in fig. 2, the control module mainly includes a main control unit, a control program interface, an external communication interface, a hologram calculation unit, a storage unit, an SLM driving unit, and a light source driving unit. The main control unit completes the control work of the whole system; the control program interface mainly provides a human-computer interface; the external communication interface mainly comprises wired interfaces such as video and data, or wireless interfaces such as wireless, Bluetooth and infrared interfaces for receiving external data; the hologram calculation unit generates a hologram from the corresponding three-dimensional image information or data through a hologram algorithm, and outputs the hologram to the spatial light modulator driving unit through the main control unit, so that the spatial light modulator is driven to modulate the light beam incident on the spatial light modulator driving unit to output the corresponding three-dimensional image information; the main control unit can also output and display the hologram which is stored in advance by the internal or external storage unit to the spatial light modulator; the main control unit can realize synchronous driving of the spatial light modulator and the light source.
The light source 12 is a point light source, the emergent light beam is divergent spherical light, and after being reflected by the beam splitter 14, the emergent light beam is collimated into parallel light by the first lens group 16 and is incident on the spatial light modulator 15. The light source 12 may be a laser light source having coherence, or may be an LED light source having certain coherence.
The spatial light modulator 15 is a reflective spatial light modulator.
The field angle magnifying system is mainly used for magnifying the imaging field of view, and as shown in fig. 3, is composed of a first lens group 16, a diaphragm 17 and a second lens group 18.
Focal length f of the first lens group 161Greater than the focal length f of the second lens group 182The distance between the first lens group 16 and the second lens group 18 is f1+f2Magnification of field angle f1/f2。
In the field angle enlarging system, the exit pupil distance S of the display system is enlarged2Distance S between spatial light modulator 15 and first lens group 161Is smaller than the focal length f of the first lens group 161Distance of exit pupil S2Can be represented as S2＝f2+f2·(f2/f1)-(f2/f1)2·S1，S1The smaller the exit pupil distance S2The larger.
The diaphragm 17 is located on the fourier transform surface of the first lens group 16, and interference of multi-order diffraction images and zero-order image imaging can be filtered out by designing a corresponding aperture diaphragm.
The first lens group 16 is a front lens group of the imaging magnification system, and has a function of collimating divergent light into parallel light.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. A holographic near-to-eye display system based on a spatial light modulator, comprising: the device comprises a control module (11), a light source (12), a polaroid (13), a first spectroscope (14), a spatial light modulator (15), a first lens group (16), a diaphragm (17), a second lens group (18) and a second spectroscope (19);
calculating three-dimensional image information to be displayed into a two-dimensional hologram by using a control module (11), outputting and loading the two-dimensional hologram to a spatial light modulator (15) for displaying, and synchronously controlling a light source (12) to emit light;
divergent light emitted by the light source (12) penetrates through the polarizing plate (13), is reflected by the first beam splitter (14), then upwards propagates, is collimated into parallel light by the first lens group (16), and is incident on the spatial light modulator (15);
after being modulated by the spatial light modulator (15), the reflected and diffracted three-dimensional imaging light beams pass through a field angle amplifying system formed by a first lens group (16), a diaphragm (17) and a second lens group (18), and then are reflected by a second beam splitter (19) to enter human eyes.
2. The spatial light modulator-based holographic near-to-eye display system of claim 1, wherein the control module (11) is capable of performing hologram calculation, loading of image information, and control of spatial light modulation and light source.
3. The spatial light modulator-based holographic near-to-eye display system of claim 2, wherein the control module (11) comprises: the device comprises a main control unit, a control program interface unit, an external communication interface, a hologram calculation unit, a storage unit, an SLM driving unit and a light source driving unit;
the main control unit is respectively connected with the storage unit, the control program interface unit, the hologram calculation unit, the external communication interface and the SLM driving unit.
4. The spatial light modulator-based holographic near-to-eye display system of claim 1, wherein the light source (12) employs a point light source;
the light beam emitted by the light source (12) is divergent spherical light, is reflected by the first beam splitter (14), is collimated into parallel light by the first lens group (16), and is incident on the spatial light modulator (15).
5. The spatial light modulator-based holographic near-to-eye display system of claim 1, wherein the light source (12) employs any one of:
-a laser light source with coherence;
-an LED light source with a set coherence.
6. Holographic near-to-eye display system based on spatial light modulators according to claim 1, characterized in that the spatial light modulator (15) is a reflective spatial light modulator.
7. The spatial light modulator-based holographic near-to-eye display system of claim 1, wherein the field angle magnifying system is operable to perform imaging field of view magnification.
8. The spatial light modulator-based holographic near-to-eye display system of claim 1, wherein the focal length f of the first lens group (16)1Is larger than the focal length f of the second lens group (18)2The distance between the first lens group (16) and the second lens group (18) is f1+f2The magnification of the field angle of the first lens group (16) and the second lens group (18) is f1/f2。
9. The spatial light modulator-based holographic near-to-eye display system of claim 8, wherein in the field angle expanding system, to expand an exit pupil distance S of the display system2A distance S between the spatial light modulator (15) and the first lens group (16)1Is smaller than the focal length f of the first lens group (16)1Distance of exit pupil S2Can be represented as S2＝f2+f2·(f2/f1)-(f2/f1)2·S1，S1The smaller the exit pupil distance S2The larger;
the diaphragm (17) is located on the Fourier transform surface of the first lens group (16).
10. A holographic near-eye display method based on a spatial light modulator, characterized in that the holographic near-eye display system based on the spatial light modulator of any one of claims 1 to 9 is adopted to perform holographic near-eye display based on the spatial light modulator.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113608353A (en) * | 2021-07-14 | 2021-11-05 | 上海大学 | Holographic near-eye display system based on array light source and eye pupil box expansion method |
| CN113687518A (en) * | 2021-08-31 | 2021-11-23 | 上海慧希电子科技有限公司 | Optical system and optical apparatus |
| CN113885209A (en) * | 2021-11-04 | 2022-01-04 | 深圳珑璟光电科技有限公司 | Holographic AR three-dimensional display method and module and near-to-eye display system |
| CN114326123A (en) * | 2021-12-27 | 2022-04-12 | 北京灵犀微光科技有限公司 | Near-to-eye display device |
| WO2024022285A1 (en) * | 2022-07-29 | 2024-02-01 | 京东方科技集团股份有限公司 | Holographic light field display system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101855600A (en) * | 2008-12-25 | 2010-10-06 | 深圳市泛彩溢实业有限公司 | System and method for holographical projection real-time three-dimension display |
| CN105700320A (en) * | 2016-04-13 | 2016-06-22 | 苏州大学 | Holographic three-dimensional display method and device based on spatial light modulator |
| CN106170729A (en) * | 2013-03-25 | 2016-11-30 | 英特尔公司 | For the method and apparatus with the head-mounted display of multiple emergent pupil |
-
2020
- 2020-12-22 CN CN202011529327.XA patent/CN112596239A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101855600A (en) * | 2008-12-25 | 2010-10-06 | 深圳市泛彩溢实业有限公司 | System and method for holographical projection real-time three-dimension display |
| CN106170729A (en) * | 2013-03-25 | 2016-11-30 | 英特尔公司 | For the method and apparatus with the head-mounted display of multiple emergent pupil |
| CN105700320A (en) * | 2016-04-13 | 2016-06-22 | 苏州大学 | Holographic three-dimensional display method and device based on spatial light modulator |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113608353A (en) * | 2021-07-14 | 2021-11-05 | 上海大学 | Holographic near-eye display system based on array light source and eye pupil box expansion method |
| CN113687518A (en) * | 2021-08-31 | 2021-11-23 | 上海慧希电子科技有限公司 | Optical system and optical apparatus |
| CN113687518B (en) * | 2021-08-31 | 2023-12-26 | 上海慧希电子科技有限公司 | Optical system and optical apparatus |
| CN113885209A (en) * | 2021-11-04 | 2022-01-04 | 深圳珑璟光电科技有限公司 | Holographic AR three-dimensional display method and module and near-to-eye display system |
| CN113885209B (en) * | 2021-11-04 | 2023-08-29 | 深圳珑璟光电科技有限公司 | Holographic AR three-dimensional display method, module and near-to-eye display system |
| CN114326123A (en) * | 2021-12-27 | 2022-04-12 | 北京灵犀微光科技有限公司 | Near-to-eye display device |
| WO2024022285A1 (en) * | 2022-07-29 | 2024-02-01 | 京东方科技集团股份有限公司 | Holographic light field display system |
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