CN111443487B - Portable large-visual-angle three-dimensional near-to-eye display system and method based on complex amplitude modulation - Google Patents
Portable large-visual-angle three-dimensional near-to-eye display system and method based on complex amplitude modulation Download PDFInfo
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- CN111443487B CN111443487B CN202010227275.4A CN202010227275A CN111443487B CN 111443487 B CN111443487 B CN 111443487B CN 202010227275 A CN202010227275 A CN 202010227275A CN 111443487 B CN111443487 B CN 111443487B
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- 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
- G02B27/0101—Head-up displays characterised by optical features
- G02B27/0103—Head-up displays characterised by optical features comprising holographic elements
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- G02B2027/0123—Head-up displays characterised by optical features comprising devices increasing the field of view
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- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0132—Head-up displays characterised by optical features comprising binocular systems
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Abstract
There is provided a portable large-viewing angle three-dimensional near-to-eye display system based on complex amplitude modulation, comprising: the phase type spatial light modulator is loaded with two phase type sub-holograms as an original three-dimensional image; the Abbe filtering imaging system is used for reproducing three-dimensional complex amplitude information of an original three-dimensional image and carrying out first amplification imaging on the original three-dimensional image; and the concave reflector is used for receiving the three-dimensional image amplified for the first time by the Abbe filtering imaging system and carrying out amplified imaging for the second time on the three-dimensional image amplified for the first time, and the three-dimensional image amplified for the second time is superposed with the scene of the real world and then is incident to eyes. The field angle of the complex amplitude modulation type three-dimensional near-to-eye display system is amplified in two steps by adopting the Abbe filtering imaging system and the curved surface reflection structure, and the complex amplitude modulation type three-dimensional near-to-eye display system has the advantages of compact structure, small volume, light weight and the like.
Description
Technical Field
The invention relates to a portable large-visual-angle three-dimensional near-to-eye display system and method based on complex amplitude modulation, and belongs to the field of three-dimensional near-to-eye display.
Background
The three-dimensional near-eye display technology is a research hotspot in the international display field in recent years, and the technology provides brand-new visual experience for an observer by superposing an artificially modulated virtual three-dimensional signal on a scene of the real world. The technology can be used for Augmented Reality (AR) and Virtual Reality (VR), and has important application prospects in the fields of military affairs, medical treatment, education, entertainment and the like. Among the many schemes for implementing three-dimensional near-eye display techniques, complex amplitude modulation, which is one of the holographic three-dimensional display techniques, is considered as one of the most promising techniques. Besides the advantage that holographic three-dimensional display can realize continuous depth change three-dimensional reconstruction, the complex amplitude modulation technology can simultaneously modulate the amplitude and the phase of incident light waves, so that a target three-dimensional image is completely restored without losing any information, and a more real three-dimensional effect is obtained. In addition, the complex amplitude modulation technology does not need to iterate the calculation of the hologram, saves a large amount of calculation time, and has the capability of realizing dynamic three-dimensional display. Therefore, the complex amplitude modulation technique is very suitable for being applied to the design of a three-dimensional near-eye display system.
For example, chinese patent CN105824128A discloses a three-dimensional augmented reality display system based on complex amplitude grating modulation, which can realize superposition of a true three-dimensional image and an external true scene, and the system includes: the system comprises an amplitude type spatial light modulator, a 4f lens system, a sinusoidal grating, a phase shifter and a half-transmitting and half-reflecting mirror; the amplitude type spatial light modulator and the sinusoidal grating are sequentially arranged on an input focal plane and a frequency spectrum plane of the 4f lens system, the phase shifter is arranged close to the amplitude type spatial light modulator, the semi-transparent semi-reflecting mirror is arranged at a certain distance behind the output focal plane of the 4f lens system, two holograms are respectively loaded on two subareas of the amplitude type spatial light modulator, under the irradiation of laser, the two holograms are modulated by the sinusoidal grating in the frequency domain of the 4f lens system and synthesized into a target amplitude complex wave front at an output surface, and the target complex amplitude wave front is transmitted to the semi-transparent semi-reflecting mirror and is coupled and superposed to the visual field of human eyes through the semi-transparent semi-reflecting mirror.
However, this system has a very limited viewing angle due to display device limitations. The core device of the existing complex amplitude modulation type three-dimensional near-to-eye display system is a spatial light modulator. The diffraction angle of a modulated output image is small due to the limitation of the grid structure of the spatial light modulator and the pixel size of the spatial light modulator is in the order of several micrometers, and in addition, due to the small size of a spatial light modulator panel, the field angle of the image output by the existing complex amplitude modulation type three-dimensional near-to-eye display system is limited, and the viewing experience is seriously influenced. In addition, in the existing complex amplitude modulation type three-dimensional near-eye display system, part of schemes adopt double spatial light modulators, and part of schemes adopt 4f systems for filtering, so that the system has more elements and large size, and does not meet the portable and portable design requirements of the near-eye display system.
In view of the above, the present invention aims to provide a portable large-viewing-angle three-dimensional near-eye display system and method based on complex amplitude modulation, so as to solve one or more of the technical problems.
Disclosure of Invention
To solve one or more technical problems in the prior art, according to an aspect of the present invention, there is provided a portable large-viewing-angle three-dimensional near-eye display system based on complex amplitude modulation, comprising:
the phase type spatial light modulator is loaded with two phase type sub-holograms as an original three-dimensional image;
the Abbe filtering imaging system is used for reproducing three-dimensional complex amplitude information of an original three-dimensional image and carrying out first amplification imaging on the original three-dimensional image; and
and the concave reflector is used for receiving the three-dimensional image amplified for the first time by the Abbe filtering imaging system and carrying out amplified imaging for the second time on the three-dimensional image amplified for the first time, and the three-dimensional image amplified for the second time is superposed with the scene of the real world and then is incident to eyes.
According to yet another aspect of the invention, an abbe filtering imaging system includes a convex lens and a sinusoidal grating located on a back focal plane of the convex lens.
According to another aspect of the invention, an abbe filtering imaging system includes a doublet and a sinusoidal grating located on a back focal plane of the doublet.
According to another aspect of the invention, the portable large-viewing-angle three-dimensional near-to-eye display system based on complex amplitude modulation further comprises a half mirror arranged between the abbe filtering imaging system and the concave mirror, and used for reflecting the three-dimensional image amplified by the concave mirror to the eyes, and the real-world scene is directly transmitted into the eyes through the half mirror.
According to another aspect of the present invention, the concave mirror is disposed in an off-axis manner with respect to the optical axis of the phase-type spatial light modulator and the abbe filtering imaging system, and the three-dimensional image magnified by the concave mirror and the real-world scene directly enter the eye.
According to another aspect of the present invention, the concave reflector is a concave half-mirror, and is configured to perform a second magnified imaging on the three-dimensional image after the first magnification, where the second magnified three-dimensional image is directly incident to the eye, and the real-world scene enters the eye through the concave half-mirror.
According to another aspect of the present invention, the portable large-viewing-angle three-dimensional near-to-eye display system based on complex amplitude modulation further includes a half mirror located on an optical path between the abbe filtering imaging system and the concave mirror, the half mirror is used for reflecting the three-dimensional image after the first amplification by the abbe filtering imaging system to the concave mirror, the concave mirror is a concave half mirror and is used for performing a second amplification imaging on the three-dimensional image after the first amplification, the three-dimensional image after the second amplification is transmitted by the half mirror and then enters the eye, and the real world scene sequentially penetrates through the concave half mirror and the half mirror and then enters the eye.
According to yet another aspect of the present invention, the phase-type spatial light modulator is transmissive or reflective.
According to still another aspect of the present invention, two phase type sub-holograms are loaded on a phase type spatial light modulator with a certain pitch.
According to another aspect of the present invention, there is also provided a method for displaying by using the aforesaid lightweight large-viewing-angle three-dimensional near-to-eye display system based on complex amplitude modulation, which is characterized by comprising the following steps:
reproducing three-dimensional complex amplitude information of the original three-dimensional image, and carrying out first amplification imaging on the original three-dimensional image;
carrying out secondary amplification imaging on the three-dimensional image subjected to the primary amplification;
and superposing the three-dimensional image after the second amplification and the scene of the real world and then injecting the three-dimensional image into the eyes.
Compared with the prior art, the invention has one or more of the following technical effects:
the method adopts the Abbe filtering imaging system and the curved surface reflection structure, realizes two-step (secondary) amplification of the field angle of the complex amplitude modulation type three-dimensional near-to-eye display system, has the advantages of compact structure, small volume, light weight and the like, and reduces the number of optical elements and the complexity of the system compared with a 4f filtering system.
Drawings
So that the manner in which the above recited features of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments. The drawings relate to preferred embodiments of the invention and are described below:
fig. 1 is a schematic structural diagram of a portable large-viewing-angle three-dimensional near-to-eye display system based on complex amplitude modulation according to a first preferred embodiment of the present invention;
fig. 2 is a schematic structural diagram of a portable large-viewing-angle three-dimensional near-to-eye display system based on complex amplitude modulation according to a second preferred embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a portable large-viewing-angle three-dimensional near-to-eye display system based on complex amplitude modulation according to a third preferred embodiment of the present invention;
fig. 4 is a schematic structural diagram of a lightweight large-viewing-angle three-dimensional near-to-eye display system based on complex amplitude modulation according to a fourth preferred embodiment of the present invention;
fig. 5 is a schematic structural diagram of a portable large-viewing-angle three-dimensional near-to-eye display system based on complex amplitude modulation according to a fifth preferred embodiment of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Reference will now be made in detail to the various embodiments, one or more examples of which are illustrated in each figure. The examples are provided by way of explanation and are not meant as limitations. For example, features illustrated or described as part of one embodiment can be used on or in conjunction with any other embodiment to yield yet a further embodiment. It is intended that the present invention encompass such modifications and variations.
In the following description of the drawings, like reference numerals designate identical or similar structures. In general, only the differences between the individual embodiments will be described. Descriptions of parts or aspects in one embodiment can also be applied to corresponding parts or aspects in another embodiment, unless explicitly stated otherwise.
Example 1
Referring to fig. 2, a schematic structural diagram of a portable large-viewing-angle three-dimensional near-to-eye display system based on complex amplitude modulation according to a preferred embodiment of the invention is shown. The portable large-viewing-angle three-dimensional near-to-eye display system based on complex amplitude modulation can comprise:
a phase type spatial light modulator 1 on which two phase type sub-holograms 201, 202 are loaded as an original three-dimensional image;
the Abbe filtering imaging system is used for reproducing three-dimensional complex amplitude information of the original three-dimensional image and carrying out first amplification imaging on the original three-dimensional image; and
and the concave reflector 5 is used for receiving the three-dimensional image amplified for the first time by the Abbe filtering imaging system and carrying out amplification imaging for the second time on the three-dimensional image amplified for the first time, and the three-dimensional image amplified for the second time is superposed with a scene 8 of the real world and then is incident to an eye 7. It will be appreciated that the present invention achieves an expansion of the field of view angle for a three-dimensional near-eye display system.
According to a preferred embodiment of the present invention, referring to fig. 1-4, an abbe filtering imaging system comprises a convex lens 3 and a sinusoidal grating 4 located on the back focal plane of the convex lens 3. The phase- type sub-holograms 201, 202 on the spatial light modulator can be modulated by placing a sinusoidal grating 4 on the back focal plane of the lens.
According to a preferred embodiment of the present invention, referring to fig. 5, the abbe filtering imaging system includes a double cemented lens 10 and a sinusoidal grating 4 located on the back focal plane of the double cemented lens 10.
According to a preferred embodiment of the present invention, referring to fig. 1, the portable large-viewing-angle three-dimensional near-to-eye display system based on complex amplitude modulation further comprises a half mirror 6 disposed between the abbe filtering imaging system and the concave mirror 5 for reflecting the three-dimensional image magnified by the concave mirror 5 to the eye 7, and the real-world scene 8 is directly transmitted into the eye 7 through the half mirror 6.
According to a preferred embodiment of the present invention, referring to fig. 2, the concave mirror 5 is disposed in an off-axis manner with respect to the optical axis of the phase-type spatial light modulator 1 and the abbe filter imaging system, and the magnified three-dimensional image of the concave mirror 5 and the real-world scene 8 directly enter the eye 7.
According to a preferred embodiment of the present invention, referring to fig. 3, the concave reflector is a concave half mirror 9, and is used for performing a second-time magnified imaging on the three-dimensional image after the first magnification, the second-time magnified three-dimensional image is directly incident to the eye 7, and the real-world scene 8 enters the eye 7 through the concave half mirror 9.
According to a preferred embodiment of the present invention, referring to fig. 4, the portable large-viewing-angle three-dimensional near-to-eye display system based on complex amplitude modulation further includes a half mirror 6 located on an optical path between the abbe filtering imaging system and the concave mirror, the half mirror 6 is used for reflecting the three-dimensional image after the first amplification by the abbe filtering imaging system to the concave mirror, the concave mirror is a concave half mirror 9 and is used for performing the second amplification imaging on the three-dimensional image after the first amplification, the three-dimensional image after the second amplification is transmitted by the half mirror 6 and then enters the eye 7, and the real world scene 8 sequentially passes through the concave half mirror 9 and the half mirror 6 and then enters the eye 7.
According to a preferred embodiment of the present invention, the phase type spatial light modulator 1 is of a transmissive type or a reflective type.
According to a preferred embodiment of the present invention, two phase type sub-holograms 201, 202 are loaded on the phase type spatial light modulator 1 with a certain pitch.
According to a preferred embodiment of the invention, it is assumed that the complex hologram expression of a three-dimensional object to be displayed is H ═ Aexp (i θ)
Where a and theta represent the amplitude and phase of the complex hologram respectively,
is an imaginary unit; the complex hologram can be decomposed into the form of the addition of two phase type sub-holograms:
exp(iθ 1 )+exp(iθ 2 )＝Aexp(iθ)
wherein theta is 1 And theta 2 Respectively representing two phase type sub-holograms, and deriving:
when the distance d separating the two sub-holograms and the sinusoidal grating period constant Λ satisfy the formula:
when the method is used, the three-dimensional complex amplitude information of the original three-dimensional image can be reproduced on the imaging surface of the Abbe filtering imaging system,wherein lambda is the wavelength of the illumination light, and f is the focal length of the convex lens;
and setting the diffraction distance of the two phase type sub-holograms to be a negative value so that the original three-dimensional image is diffracted to be a virtual image.
According to a preferred embodiment of the present invention, there is also provided a method for displaying by using the aforementioned portable large-viewing-angle three-dimensional near-to-eye display system based on complex amplitude modulation, which includes the following steps:
reproducing three-dimensional complex amplitude information of the original three-dimensional image, and carrying out first amplification imaging on the original three-dimensional image;
carrying out secondary amplification imaging on the three-dimensional image subjected to the primary amplification;
the three-dimensional image after the second magnification is superimposed with a scene 8 of the real world and then is incident on the eye 7.
The main technical principle of the invention is as follows: on one hand, the Abbe filtering imaging system used in the invention can realize the complex amplitude reproduction of the three-dimensional signal and improve the image quality; on the other hand, the enlarged imaging of the original three-dimensional image can be realized. The curved surface reflecting structure (concave surface reflecting mirror) can realize the optical characteristic of the convex lens on one hand and amplify and image the input image on the other hand, and the reflecting structure can fold the light path on the other hand, thereby further reducing the size of the system and leading the system to be more compact and light.
According to a preferred embodiment of the present invention, referring again to fig. 1, the portable large-viewing angle three-dimensional near-to-eye display system based on complex amplitude modulation comprises a phase type spatial light modulator 1, two phase type sub-holograms 201, a convex lens 3, a sinusoidal grating 4, a concave mirror 5 and a half-reflecting half-mirror 6. The spatial light modulator may be transmissive or reflective. The phase type spatial light modulator 1 is loaded with two phase type sub-holograms as a three-dimensional image source. Suppose that the expression of a complex hologram of a three-dimensional object to be displayed is H ═ Aexp (i θ)
Where a and theta represent the amplitude and phase of the complex hologram respectively,
is an imaginary unit. The complex amplitude signal can be decomposed into the form of the addition of two phase type sub-holograms:
exp(iθ 1 )+exp(iθ 2 )＝Aexp(iθ)
wherein theta is 1 And theta 2 Respectively representing two phase type sub-holograms. By derivation, we can get:
two phase type sub-holograms are loaded on a phase type spatial light modulator at a certain distance d. An abbe filtering imaging system is arranged behind the spatial light modulator. The abbe filter imaging system comprises, for example, a convex lens 3 and a sinusoidal grating 4. The sinusoidal grating 4 is placed on the back focal plane of the convex lens 3. When the distance d separating the two sub-holograms and the sinusoidal grating period constant Λ satisfy the formula:
and when the signal is displayed, three-dimensional complex amplitude information of the signal to be displayed can be reproduced on an imaging surface of the Abbe filtering imaging system. Wherein λ is the wavelength of the illumination light and f is the focal length of the convex lens.
For two phase type sub-holograms, the diffraction distance can be set to be negative, so that the original three-dimensional image is diffracted into a virtual image (left side of the spatial light modulator in fig. 1). The position of the convex lens is adjusted, so that the original three-dimensional image is positioned outside and close to the focal length of one time of the convex lens, and according to the lens imaging principle, the original image can form an inverted amplified real image outside the focal length of two times of the convex lens, thereby realizing the first-step (secondary) amplification of the three-dimensional image. The light passing through the abbe imaging system irradiates on the concave reflector 5, and the image amplified in the first step is positioned within one focal length of the concave reflector by adjusting the position of the concave reflector. According to the imaging principle of the concave reflector, an orthoscopic enlarged virtual image can be formed in the image space (the right side of the figure 1) of the concave reflector, and the second-step (secondary) enlargement of the three-dimensional image is realized. The half-reflecting half-transmitting mirror 6 is placed close to the concave reflecting mirror, and a virtual image formed by the concave reflecting mirror is reflected to human eyes 7, so that the human eyes observe an amplified virtual image. Meanwhile, the scene 8 of the real world scene directly enters human eyes through the half-reflecting and half-transmitting lens, so that the human eyes can observe the superimposed effect.
According to a preferred embodiment of the invention, with reference to fig. 2, the difference compared to the solution of fig. 1 is that: this scheme uses an off-axis reflection scheme of the concave mirror 5. The half-reflecting and half-transmitting mirror in the first scheme is omitted at the observation position of the human eyes, and the image reflected by the concave reflector can directly enter the human eyes by adjusting the angle of the concave reflector. The front-end optical path is the same as the scheme in fig. 1, and is not described herein again.
According to a preferred embodiment of the present invention, referring to fig. 3, the difference compared to the scheme in fig. 1 is that: the half-reflecting and half-transmitting mirror and the curved surface reflector at the observation position of human eyes are combined and replaced to form the concave half-reflecting and half-transmitting mirror 9, the reflecting surface of the concave half-reflecting and half-transmitting mirror is a curved surface (concave surface), the same optical performance as the concave surface reflector can be realized, and the three-dimensional image is amplified for the second time. Meanwhile, the scene of the front external world can enter human eyes through the concave semi-reflecting and semi-transmitting mirror 9, and the near-to-eye display of the virtual three-dimensional image superimposed on the real scene is realized. The concave semi-reflecting and semi-transmitting mirror 9 uses an off-axis reflection scheme with 45 degrees incidence, and the front-section light path is the same as the scheme in fig. 1, and is not described again here.
According to a preferred embodiment of the present invention, referring to fig. 4, compared to the scheme in fig. 1, the difference is that: the scheme uses the same concave semi-reflecting and semi-transmitting mirror 9 as the scheme in the figure 3, the concave semi-reflecting and semi-transmitting mirror 9 is arranged in front of human eyes, light rays penetrating through an Abbe imaging system are firstly reflected to the front surface of the concave semi-reflecting and semi-transmitting mirror 9 by the semi-reflecting and semi-transmitting mirror 6, the front surface is a curved surface (concave surface) reflecting surface, the same optical performance as the concave reflecting mirror can be realized, and a three-dimensional image is amplified for the second time. The amplified image is transmitted into human eyes through the half-reflecting and half-transmitting lens 6. Meanwhile, a scene 8 of the front external world can enter human eyes through the concave semi-reflecting and semi-transmitting mirror 9 and the semi-reflecting and semi-transmitting mirror 6, and near-to-eye display of a virtual three-dimensional image superimposed on a real scene is achieved. In the scheme, the concave semi-reflecting and semi-transmitting mirror 9 uses a normal incidence coaxial reflection scheme, and the front-section light path is the same as the scheme in fig. 1, and is not described again.
According to a preferred embodiment of the invention, with reference to fig. 5, the difference compared to the solution of fig. 1 is that: a double cemented lens 10 is used. When the image displayed by the system is a color three-dimensional image, the double cemented lens 10 can correct chromatic aberration well, so that the system can achieve a better color three-dimensional display effect. The other optical paths of the system are the same as the scheme in fig. 1, and are not described again here.
Compared with the prior art, the invention has one or more of the following technical effects:
the method adopts the Abbe filtering imaging system and the curved surface reflection structure, realizes two-step (secondary) amplification of the field angle of the complex amplitude modulation type three-dimensional near-to-eye display system, has the advantages of compact structure, small volume, light weight and the like, and reduces the number of optical elements and the complexity of the system compared with a 4f filtering system.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
The above embodiments are merely preferred embodiments of the present invention, which are not intended to limit the present invention, and the features of the embodiments that do not violate each other may be combined with each other. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A portable large-view-angle three-dimensional near-to-eye display system based on complex amplitude modulation is characterized by comprising the following components:
the phase type spatial light modulator is loaded with two phase type sub-holograms as an original three-dimensional image;
the Abbe filtering imaging system is used for reproducing three-dimensional complex amplitude information of an original three-dimensional image and carrying out first amplification imaging on the original three-dimensional image;
the concave reflector is used for receiving the three-dimensional image amplified for the first time by the Abbe filtering imaging system and carrying out amplification imaging for the second time on the three-dimensional image amplified for the first time, and the three-dimensional image amplified for the second time is superposed with a scene of a real world and then is incident to eyes; and
the semi-transparent semi-reflecting mirror is arranged between the Abbe filtering imaging system and the concave reflecting mirror and is used for reflecting the three-dimensional image amplified by the concave reflecting mirror to eyes, and the real world scene directly penetrates through the semi-transparent semi-reflecting mirror and enters the eyes;
the abbe filtering imaging system consists of a convex lens and a sinusoidal grating positioned on the back focal plane of the convex lens, or the abbe filtering imaging system consists of a double-cemented lens and a sinusoidal grating positioned on the back focal plane of the double-cemented lens;
wherein, two phase type sub-holograms are loaded on the phase type spatial light modulator at a certain distance, and the expression of a complex hologram of a three-dimensional object to be displayed is assumed as
H＝Aexp(iθ)
Where a and theta represent the amplitude and phase of the complex hologram respectively,
is an imaginary unit; the complex hologram can be decomposed into the form of the addition of two phase type sub-holograms:
exp(iθ 1 )+exp(iθ 2 )＝Aexp(iθ)
wherein theta is 1 And theta 2 Respectively representing two phase type sub-holograms, and deriving:
when the distance d separating the two sub-holograms and the sinusoidal grating period constant Λ satisfy the formula:
when the image is displayed, the original image is reproduced on the imaging surface of the Abbe filtering imaging systemStarting three-dimensional complex amplitude information of the three-dimensional image, wherein lambda is the wavelength of illumination light, and f is the focal length of the convex lens; setting the diffraction distance of the two phase type sub-holograms to be a negative value, so that the original three-dimensional image is diffracted to form a virtual image;
the phase type spatial light modulator, the convex lens, the sinusoidal grating, the semi-transparent semi-reflecting mirror and the concave reflecting mirror are sequentially arranged along an optical axis, and the scene and eyes of the real world are respectively positioned on two sides of the optical axis; or the phase type spatial light modulator, the double-cemented lens, the sinusoidal grating, the semi-transparent semi-reflecting mirror and the concave reflecting mirror are sequentially arranged along the optical axis, and the scene and eyes of the real world are respectively positioned on two sides of the optical axis.
2. The portable large-viewing angle three-dimensional near-to-eye display system based on complex amplitude modulation of claim 1 wherein the phase-type spatial light modulator is transmissive or reflective.
3. A method for displaying by using the portable large-viewing angle three-dimensional near-to-eye display system based on complex amplitude modulation as claimed in any one of claims 1-2, characterized by comprising the following steps:
reproducing three-dimensional complex amplitude information of the original three-dimensional image, and carrying out first amplification imaging on the original three-dimensional image;
carrying out secondary amplification imaging on the three-dimensional image subjected to the primary amplification;
and superposing the three-dimensional image after the second amplification and the scene of the real world and then injecting the three-dimensional image into the eyes.
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