Holographic retinal projection near-eye display method and system based on phase mask optimization

Abstract

The present application relates to holographic retinal projection near-eye display technical field, especially in kind based on phase mask optimization holographic retinal projection near-eye display method and system.It includes: with the rectangular aperture of target image distribution zero padding as input amplitude, and superimposed random phase mask, get the initial input complex amplitude of holographic plane;According to the initial input complex amplitude of the holographic plane, get the optimization phase mask of the holographic plane;According to the optimization phase mask, get the complex amplitude of the holographic plane;Extract the phase of the complex amplitude of the holographic plane, get the phase of the holographic plane light wave;The phase of the holographic plane light wave is superimposed on the phase of the converging spherical wave, and the RPD phase distribution is obtained;The RPD phase distribution is encoded to obtain a pure phase hologram;The pure phase hologram is input to a phase type spatial light modulator to obtain a holographic near-eye display result.The present application can realize high-quality holographic near-eye display effect in a short time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of holographic retinal projection near-eye display, in particular to a holographic retinal projection near-eye display method and system based on phase mask optimization. BACKGROUND

[0002] Near eye display (NED) as one of the basic devices to realize augmented reality (AR) and provide immersive interactive experience, is currently widely concerned. The traditional near-eye display cannot provide correct three-dimensional scene intersection clues. Therefore, the brain will produce dizziness, fatigue and other discomforts caused by vergence-accommodation conflict (VAC) when processing such different information for a long time.

[0003] Retinal projection display (RPD) technology uses a lens to converge the target image on the pupil, which can image on the retina, and to a certain extent, alleviate the VAC problem. The holographic RPD technology based on holographic wavefront control can realize flexible control of the number of view points, position and image depth, and expand the depth of field and eye movement range. However, most of the existing holographic RPD methods have low diffraction efficiency, conjugate image interference, high computational cost, and poor reproduction quality. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a holographic retinal projection near-eye display method and system based on phase mask optimization, which solves the problem of low diffraction efficiency, conjugate image interference, high computational cost and poor reproduction quality in most of the existing holographic RPD methods.

[0005] To achieve the above-mentioned purposes and other related purposes, the present application provides a holographic retinal projection near-eye display method based on phase mask optimization, comprising:

[0006] S1, zero padding is performed on the rectangular aperture of the target image distribution as the input amplitude, and a random phase mask is superimposed to obtain the initial input complex amplitude of the holographic plane;

[0007] S2, according to the initial input complex amplitude of the holographic plane, the optimized phase mask of the holographic plane is obtained;

[0008] S3, according to the optimized phase mask, the complex amplitude of the holographic plane is obtained;

[0009] S4, the phase of the complex amplitude of the holographic plane is extracted to obtain the phase of the holographic plane light wave.

[0010] S5, superimposing the phase of the holographic plane object wave with a converging spherical wave phase to obtain an RPD phase distribution;

[0011] S6, encoding the RPD phase distribution to obtain a pure phase hologram;

[0012] S7, inputting the pure phase hologram into a phase type spatial light modulator to obtain a holographic near-eye display result.

[0013] In an embodiment of the present application, further comprising: S0, obtaining a target image distribution.

[0014] In an embodiment of the present application, the obtaining of the optimized phase mask of the holographic plane according to the initial input complex amplitude of the holographic plane in step S2 comprises:

[0015] The initial input complex amplitude u(x, y) of the holographic plane is propagated to an image plane by using an angular spectrum propagation model to obtain an image plane complex amplitude U(x, y), and the formula is: wherein, represents a Fourier transform, represents an inverse Fourier transform, u(x, y) represents the initial input complex amplitude of the holographic plane, and U(x, y) represents the image plane complex amplitude; H(f x ,f y ) represents a transfer function related to a propagation distance z, and H(f x ,f y ) is represented as:

[0016]

[0017] wherein, λ represents an illumination wavelength, f x and f y respectively represent spatial frequencies along the x-axis and the y-axis direction, the phase of the image plane complex amplitude U(x, y) is extracted, and an inverse angular spectrum propagation model is used to obtain a complex amplitude distribution of the holographic plane:

[0018] The inverse angular spectrum propagation model is

[0019] wherein, arg represents the extraction of the phase, A(x, y) represents an amplitude constrained on the image plane, H -z (f x ,f y ) represents an inverse transfer function related to a propagation distance z, and u'(x, y) represents the complex amplitude of the holographic plane obtained by inverse propagation;

[0020] The complex amplitude of the holographic plane is subjected to multiple forward and inverse angular spectrum propagations to obtain the optimized phase mask of the holographic plane.

[0021] In an embodiment of the present application, the step S3 of obtaining the complex amplitude of the holographic plane according to the optimized phase mask comprises:

[0022] S31, superimposing the target image on the optimized phase mask to obtain the complex amplitude of the object plane;

[0023] S32, propagating the complex amplitude of the object plane to the holographic plane by using an angular spectrum propagation model to obtain the complex amplitude of the holographic plane.

[0024] In an embodiment of the present application, the step S5 of superimposing the phase of the object light wave of the holographic plane on the phase of the converging spherical wave to obtain the RPD phase distribution comprises:

[0025] superimposing the phase of the object light wave of the holographic plane on the phase of the converging spherical wave to obtain the RPD phase distribution

[0026]

[0027]

[0028] wherein, represents the phase distribution of the holographic plane, represents the RPD phase distribution, and f represents the distance between the holographic plane and the human eye.

[0029] In an embodiment of the present application, the phase-type spatial light modulator comprises:

[0030] a laser light source, an attenuating sheet, a spatial filter, a collimating lens, a polarizing sheet, a beam splitter, and a spatial light modulator arranged in sequence;

[0031] The axes of the laser light source, the attenuating sheet, the spatial filter, the collimating lens, the polarizing sheet, the beam splitter, and the spatial light modulator are on a straight line.

[0032] In an embodiment of the present application, the spatial light modulator is connected to a computer.

[0033] The present application also provides a holographic retinal projection near-eye display system based on phase mask optimization, comprising:

[0034] an initial input complex amplitude obtaining unit of the holographic plane, configured to perform zero padding with a rectangular aperture of a target image distribution as an input amplitude, and superimpose a random phase mask to obtain an initial input complex amplitude of the holographic plane;

[0035] an optimized phase mask obtaining unit of the holographic plane, configured to obtain an optimized phase mask of the holographic plane according to the initial input complex amplitude of the holographic plane;

[0036] ​A holographic plane complex amplitude acquisition unit is configured to obtain a holographic plane complex amplitude according to the optimized phase mask;

[0037] A holographic plane object light wave phase acquisition unit is configured to extract a phase of the holographic plane complex amplitude to obtain a holographic plane object light wave phase;

[0038] An RPD phase distribution acquisition unit is configured to superimpose the holographic plane object light wave phase and a converging spherical wave phase to obtain an RPD phase distribution;

[0039] A pure phase hologram acquisition unit is configured to encode the RPD phase distribution to obtain a pure phase hologram;

[0040] A holographic near-eye display acquisition unit is configured to input the pure phase hologram into a phase type spatial light modulator to obtain a holographic near-eye display result.

[0041] In an embodiment of the present application, the method further comprises:

[0042] A target image distribution acquisition unit is configured to obtain a target image distribution.

[0043] The present application further provides an electronic device comprising a processor and a memory, wherein the memory stores program instructions, and the processor executes the program instructions to implement the holographic retinal projection near-eye display method based on phase mask optimization.

[0044] As described above, the holographic retinal projection near-eye display method and system based on phase mask optimization have the following beneficial effects:

[0045] The holographic retinal projection near-eye display method based on phase mask optimization avoids the problems of low diffraction efficiency, conjugate image interference, high calculation cost, and poor reproduction quality, and can achieve high-quality holographic near-eye display effect in a short time. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 A workflow diagram of the holographic retinal projection near-eye display method based on phase mask optimization is provided for the embodiments of the present application.

[0047] Figure 2 A phase mask optimization algorithm flowchart of the holographic retinal projection near-eye display method based on phase mask optimization is provided for the embodiments of the present application.

[0048] Figure 3 A pure phase hologram production flowchart of the holographic retinal projection near-eye display method based on phase mask optimization is provided for the embodiments of the present application.

[0049] Figure 4A phase-type spatial light modulator structure diagram of a holographic retinal projection near-eye display method based on phase mask optimization provided by an embodiment of the present application.

[0050] Figure 5 A structure diagram of a holographic retinal projection near-eye display system based on phase mask optimization provided by an embodiment of the present application.

[0051] Figure 6 A structure block diagram of a computer readable storage medium provided by an embodiment of the present application. DETAILED DESCRIPTION

[0052] The embodiments of the present application will be described in detail by specific examples, and other advantages and effects of the present application can be easily understood by those skilled in the art from the contents disclosed in the specification. The present application can also be implemented or applied by other different specific embodiments, and various modifications or changes can be made to the details in the specification based on different views and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0053] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner, and only the components related to the present application are shown in the diagrams, not the number, shape and size of the components when actually implemented. The actual implementation of each component may be a random change, and the component layout pattern may be more complex.

[0054] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 1 A work flow diagram of a holographic retinal projection near-eye display method based on phase mask optimization provided by an embodiment of the present application. Figure 2 A phase mask optimization algorithm flow diagram of a holographic retinal projection near-eye display method based on phase mask optimization provided by an embodiment of the present application. Figure 3 A pure phase hologram production flow diagram of a holographic retinal projection near-eye display method based on phase mask optimization provided by an embodiment of the present application. The present application provides a holographic retinal projection near-eye display method based on phase mask optimization, comprising:

[0055] Step S1, zero padding with a rectangular aperture of a target image distribution as an input amplitude, and superimposing a random phase mask to obtain an initial input complex amplitude of a holographic plane.

[0056] For example, the resolution of the target image is N*N, first, a rectangular aperture window with the same resolution as the target image is created, the rectangular aperture window is zero-padded to 2N*2N size, then a random phase mask is superimposed on the rectangular window to obtain the initial input complex amplitude u(x, y) of the holographic plane.

[0057] Step S2, obtaining the optimized phase mask of the holographic plane according to the initial input complex amplitude of the holographic plane.

[0058] Specifically, the optimized phase mask of the holographic plane is obtained based on the Gerchberg-Saxton (GS) algorithm.

[0059] The initial input complex amplitude u(x, y) of the holographic plane is propagated to the image plane by using an angular spectrum propagation model to obtain the image plane complex amplitude U(x, y), and the formula is: Wherein, represents the Fourier transform, represents the inverse Fourier transform, u(x, y) represents the initial input complex amplitude of the holographic plane, and U(x, y) represents the image plane complex amplitude; H(f x ,f y ) represents the transfer function related to the propagation distance z, and H(f x ,f y ) represents:

[0060]

[0061] Wherein, λ represents the illumination wavelength, f x and f y respectively represent the spatial frequency along the x-axis and the y-axis direction, the phase of the image plane complex amplitude U(x, y) is extracted, and the inverse angular spectrum propagation model is used to obtain the complex amplitude distribution of the holographic plane:

[0062] The inverse angular spectrum propagation model is

[0063] Wherein, arg represents the extracted phase, A(x, y) represents the amplitude constrained on the image plane, H -z (f x ,f y ) represents the inverse transfer function related to the propagation distance z, and u'(x, y) represents the complex amplitude of the holographic plane obtained by inverse propagation;

[0064] The complex amplitude of the holographic plane is propagated multiple times by the forward and inverse angular spectrum propagation to obtain the optimized phase mask of the holographic plane.

[0065] Step S3, obtaining the holographic plane complex amplitude according to the optimized phase mask.

[0066] Specifically, the step S3 of obtaining the holographic plane complex amplitude according to the optimized phase mask includes:

[0067] S31, performing target image superposition on the optimized phase mask to obtain an object plane complex amplitude O(x, y).

[0068] S32, propagating the object plane complex amplitude to a holographic plane by using an angular spectrum propagation model to obtain a holographic plane complex amplitude Holo(x, y).

[0069] Step S4, extracting a phase of the holographic plane complex amplitude Holo(x, y) to obtain a phase of a holographic plane object light wave

[0070]

[0071] Step S5, superimposing the phase of the holographic plane object light wave with a converging spherical wave phase to obtain an RPD phase distribution:

[0072]

[0073] wherein, Holo(x, y) represents the holographic plane phase distribution, RPD represents the RPD phase distribution, and f represents a distance between the holographic plane and the human eye.

[0074] Step S6, encoding the RPD phase distribution to obtain a pure phase hologram.

[0075] Step S7, inputting the pure phase hologram into a phase type spatial light modulator to obtain a holographic near-eye display result.

[0076] The object light wave modulated by the phase type spatial light modulator converges at the human eye position, and the retinal projection display is realized. In addition, the converging spherical wave phase should satisfy the Gaussian imaging formula, and the relationship between the input image plane and the imaging plane is:

[0077]

[0078] wherein, Z1 represents a distance between the input image plane and the holographic plane, and Z2 represents an imaging distance.

[0079] Please refer to Figure 4 , Figure 4A phase-type spatial light modulator structure schematic diagram of a holographic retinal projection near-eye display method based on phase mask optimization provided by the embodiment of the application. The phase-type spatial light modulator comprises: a laser light source, an attenuating sheet, a spatial filter, a collimating lens, a polarizer, a beam splitter and a spatial light modulator arranged in sequence; the axes of the laser light source, the attenuating sheet, the spatial filter, the collimating lens, the polarizer, the beam splitter and the spatial light modulator are on a straight line. The spatial light modulator is connected with a computer.

[0080] A coherent light beam with a wavelength of 532 nm becomes a plane illumination wave sensitive to SLM modulation after passing through the attenuating sheet, the spatial filter, the collimating lens and the polarizer. A pure phase-type CGH is loaded on the SLM to modulate the plane illumination wave. The SLM used in the experiment is a HoloEye Gaea-2Vis, with a pixel pitch of 3.74 μm and a sampling point number of 3840x2160. After being irradiated by the laser, the SLM diffracts and converges to the human eye through a half-transmission half-reflection mirror. The real scene also enters the human eye through the half-transmission half-reflection mirror. In the optical path, the eye point position is located 12.5 cm in front of the spatial light modulator, and the input image plane is located 10 cm behind the spatial light modulator. Therefore, the imaging plane is located 50 cm behind the spatial light modulator.

[0081] The holographic retinal projection near-eye display method based on phase mask optimization further comprises the following steps: S0, acquiring a target image distribution.

[0082] Similar to the principle of the holographic retinal projection near-eye display method based on phase mask optimization, the application also provides a holographic retinal projection near-eye display system based on phase mask optimization, comprising:

[0083] An initial input complex amplitude acquisition unit 10 of a holographic plane is configured to perform zero padding with a rectangular aperture of the target image distribution as an input amplitude, and superimpose a random phase mask to obtain an initial input complex amplitude of the holographic plane;

[0084] An optimized phase mask acquisition unit 20 of the holographic plane is configured to obtain an optimized phase mask of the holographic plane according to the initial input complex amplitude of the holographic plane;

[0085] A holographic plane complex amplitude acquisition unit 30 is configured to obtain a holographic plane complex amplitude according to the optimized phase mask;

[0086] A phase acquisition unit 40 of a holographic plane physical light wave is configured to extract a phase of the holographic plane complex amplitude to obtain a phase of a holographic plane physical light wave;

[0087] An RPD phase distribution acquisition unit 50 is configured to superimpose a converging spherical wave phase on the phase of the holographic plane physical light wave to obtain an RPD phase distribution;

[0088] A pure phase hologram acquisition unit 60 is configured to encode the RPD phase distribution to obtain a pure phase hologram.

[0089] A holographic near-eye display acquisition unit 70 is configured to input the pure phase hologram into a phase-type spatial light modulator to obtain a holographic near-eye display result.

[0090] A target image distribution acquisition unit 80 is configured to acquire a target image distribution.

[0091] The present application also provides an electronic device, which comprises a processor and a memory. The memory stores program instructions, and the processor executes the program instructions to implement the holographic retinal projection near-eye display method based on phase mask optimization. The processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc. The processor can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The memory can include a random access memory (RAM) and can also include a non-volatile memory (NVM), such as at least one disk memory. The memory can also be an internal memory of a random access memory (RAM) type. The processor and the memory can be integrated into one or more independent circuits or hardware, such as an application specific integrated circuit (ASIC). It should be noted that the computer program in the memory can be implemented in the form of a software functional unit and sold or used as an independent product. When the computer program is stored in a computer readable storage medium, such as a computer disk, it can be installed into the memory of a computer device to enable the computer device to execute the program instructions. Figure 6 As shown, based on such understanding, the technical solutions of the present application, in essence, or the part of the prior art that makes a contribution, or the part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for enabling a computer device (which can be a personal computer, an electronic device, or a network device, etc.) to execute all or part of the steps of the method of each embodiment of the present application.

[0092] In another aspect, the embodiments of the present application also provide a non-transitory computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the method provided by the above-mentioned embodiments, for example, comprising:

[0093] Obtaining an image to be displayed;

[0094] According to the initial input complex amplitude of the holographic plane, an optimized phase mask of the holographic plane is obtained;

[0095] According to the optimized phase mask, a holographic plane complex amplitude is obtained;

[0096] The phase of the holographic plane complex amplitude is extracted to obtain the phase of the holographic plane light wave;

[0097] The phase of the holographic plane light wave is superimposed with the phase of the converging spherical wave to obtain the RPD phase distribution;

[0098] The RPD phase distribution is encoded to obtain a pure phase hologram;

[0099] The pure phase hologram is loaded into a phase type spatial light modulator to obtain a holographic near-eye display result.

[0100] The device embodiments described above are only illustrative, wherein the units described as separate components can or can not be physically separated, and all or part of the modules can be selected to achieve the purpose of the embodiments according to actual needs.

[0101] In summary, the holographic retinal projection near-eye display method based on phase mask optimization of the present application avoids the problems of low diffraction efficiency, conjugate image interference, high calculation cost and poor reproduction quality, and can realize high-quality holographic near-eye display effect in a short time.

[0102] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical idea of the present application should be covered by the claims of the present application.

Claims

1. A holographic retinal projection near-eye display method based on phase mask optimization, characterized in that, The method comprises the following steps: S1, filling zeros with a rectangular aperture of a target image distribution as an input amplitude, and superimposing a random phase mask to obtain an initial input complex amplitude of a holographic plane; S2, obtaining an optimized phase mask of the holographic plane according to the initial input complex amplitude of the holographic plane; S3, obtaining a holographic plane complex amplitude according to the optimized phase mask; S4, extracting a phase of the holographic plane complex amplitude to obtain a phase of a holographic plane object light wave; S5, superimposing a converging spherical wave phase on the phase of the holographic plane object light wave to obtain an RPD phase distribution; S6, encoding the RPD phase distribution to obtain a pure phase hologram; S7, inputting the pure phase hologram into a phase type spatial light modulator (SLM) to obtain a holographic near-eye display result; In step S2, the optimized phase mask of the holographic plane is obtained according to the initial input complex amplitude of the holographic plane, which comprises: The initial input complex amplitude u(x, y) of the holographic plane is propagated to the image plane by using an angular spectrum propagation model to obtain an image plane complex amplitude U(x, y), and a formula is as follows: Wherein, represents a Fourier transform, represents an inverse Fourier transform, u(x, y) represents the initial input complex amplitude of the holographic plane, and U(x, y) represents the image plane complex amplitude; H(f x ,f y ) represents a transfer function related to a propagation distance z, and H(f x ,f y ) is represented as follows: where λ denotes the illumination wavelength, f x and f y denote the spatial frequencies along the x and y axis, respectively, the phase of the complex amplitude U(x, y) of the image plane is extracted, and the complex amplitude distribution of the holographic plane is obtained using the inverse angular spectrum propagation model: The inverse angular spectrum propagation model is where arg denotes the extracted phase, A(x, y) denotes the amplitude constrained on the image plane, H -z (f x ,f y ) denotes the inverse transfer function related to the propagation distance z, u'(x, y) denotes the complex amplitude of the holographic plane obtained by inverse propagation; The optimized phase mask of the holographic plane is obtained by multiple forward and reverse angular spectrum propagation of the complex amplitude of the holographic plane; In step S3, the holographic plane complex amplitude is obtained according to the optimized phase mask, which comprises: S31, superimposing a target image on the optimized phase mask to obtain an object plane complex amplitude; S32, propagating the object plane complex amplitude to the holographic plane by using an angular spectrum propagation model to obtain a holographic plane complex amplitude; In step S5, the RPD phase distribution is obtained by superimposing the converging spherical wave phase on the phase of the holographic plane object light wave, which comprises: The phase of the holographic planar wave is modified by adding a converging spherical wave phase to obtain a RPD phase distribution The phase of the holographic planar wave is modified by adding a converging spherical wave phase to obtain a RPD phase distribution wherein represents the holographic plane phase distribution, represents the RPD phase distribution, f represents the distance of the holographic plane from the human eye.

2. The holographic retinal projection near-eye display method based on phase mask optimization according to claim 1, characterized in that, Further comprising: S0, obtaining a target image distribution.

3. The holographic retinal projection near-eye display method based on phase mask optimization according to claim 1, characterized in that, The phase type spatial light modulator comprises: A laser light source, an attenuation sheet, a spatial filter, a collimating lens, a polarizer, a beam splitter and a spatial light modulator are sequentially arranged; The axes of the laser light source, the attenuation sheet, the spatial filter, the collimating lens, the polarizer, the beam splitter and the spatial light modulator are on a straight line.

4. The holographic retinal projection near-eye display method based on phase mask optimization according to claim 1, characterized in that: The spatial light modulator is connected with a computer.

5. A holographic retinal projection near-eye display system based on phase mask optimization, characterized in that, The method comprises: An initial input complex amplitude obtaining unit (10) is configured to fill zeros with a rectangular aperture of a target image distribution as an input amplitude, and superimpose a random phase mask to obtain an initial input complex amplitude of a holographic plane; An optimized phase mask obtaining unit (20) is configured to obtain an optimized phase mask of the holographic plane according to the initial input complex amplitude of the holographic plane; A holographic plane complex amplitude obtaining unit (30) is configured to obtain a holographic plane complex amplitude according to the optimized phase mask; A holographic plane object light wave phase obtaining unit (40) is configured to extract a phase of the holographic plane complex amplitude to obtain a phase of a holographic plane object light wave; An RPD phase distribution obtaining unit (50) is configured to superimpose a converging spherical wave phase on the phase of the holographic plane object light wave to obtain an RPD phase distribution; A pure phase hologram obtaining unit (60) is configured to encode the RPD phase distribution to obtain a pure phase hologram; A holographic near-eye display obtaining unit (70) is configured to input the pure phase hologram into a phase type spatial light modulator to obtain a holographic near-eye display result. The optimization phase mask obtaining unit (20) of the holographic plane is further used for: The initial input complex amplitude u(x, y) of the holographic plane is propagated to the image plane by using an angular spectrum propagation model to obtain an image plane complex amplitude U(x, y), and a formula is as follows: Wherein, represents a Fourier transform, represents an inverse Fourier transform, u(x, y) represents the initial input complex amplitude of the holographic plane, and U(x, y) represents the image plane complex amplitude; H(f x ,f y ) represents a transfer function related to a propagation distance z, and H(f x ,f y ) is represented as follows: where λ denotes the illumination wavelength, f x and f y denote the spatial frequencies along the x and y axes, respectively, the phase of the complex amplitude U(x, y) of the image plane is extracted, and the complex amplitude distribution of the holographic plane is obtained using the inverse angular spectrum propagation model: The inverse angular spectrum propagation model is where arg denotes the extracted phase, A(x, y) denotes the amplitude constrained on the image plane, H -z (f x ,f y ) denotes the inverse transfer function related to the propagation distance z, u'(x, y) denotes the complex amplitude of the hologram plane obtained by inverse propagation; The complex amplitude of the holographic plane is propagated in multiple forward and reverse angular spectrums to obtain the optimization phase mask of the holographic plane; The complex amplitude obtaining unit (30) of the holographic plane is further used for: superimposing the target image on the optimization phase mask to obtain the object plane complex amplitude; and propagating the object plane complex amplitude to the holographic plane by using an angular spectrum propagation model to obtain the holographic plane complex amplitude; The RPD phase distribution obtaining unit (50) is further used for: The phase of the holographic plane wave is The phase of the converging spherical wave is superimposed to obtain the RPD phase distribution wherein represents the holographic plane phase distribution, represents the RPD phase distribution, f represents the distance of the holographic plane from the human eye.

6. The phase mask optimization based holographic retinal projection near- eye display system of claim 1, wherein, Further comprising: A target image distribution obtaining unit (80) is used for obtaining a target image distribution.

7. An electronic device comprising a processor and a memory, the memory storing program instructions, wherein: The processor runs program instructions to implement the holographic retinal projection near-eye display method based on phase mask optimization according to any one of claims 1 to 4.

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