CN106980178A - A kind of phase-type LCoS image-signal processing methods and near-eye display system - Google Patents

Abstract

The invention discloses a phase-type LCoS image signal processing method, which uses an improved GS algorithm to generate an optical image by modulating input phase-type LCoS image information and incident light. The invention also discloses a phase-type LCoS near-eye display system, which includes a light source module for emitting laser light and generating a collimated uniform plane wave incident on the phase-type LCoS module; the phase-type LCoS module includes a phase-type LCoS and a processing unit, the The processing unit is used to process the image signal input to the phase-type LCoS for processing, and the phase-type LCoS is used to display the image information input by the processing unit and reflect the light beam carrying the image information; the image receiving module or the human eye , for collecting the image information carried by the light beam reflected by the phase-type LCoS, and superimposing the generated optical virtual image with the real scene, and the generated image satisfies the virtual reality effect.

Description

A phase-type LCoS image signal processing method and near-eye display system

technical field

The invention belongs to the technical field of near-eye display, and in particular relates to a phase-type LCoS image signal processing method and a phase-type LCoS near-eye display system.

Background technique

Near-eye display technology is widely used in many fields. In the early days, it was mainly military and scientific research. With the advancement of science and technology and breakthroughs in core technologies, near-eye display systems have steadily developed in the direction of light weight and low price. The near-eye display system has gradually entered into daily life, and people can use the near-eye display system for various entertainment, such as watching movies and playing games. The near-eye display system will further enrich people's lives.

As a micro display technology, LCoS emerged in the late 1990s. With the maturity of the technology and the improvement of the process, it has gradually been applied in the field of near-eye display. In addition, LCoS display technology is gradually replacing previous display technology and projection technology with its advantages of high resolution, high brightness, and low cost. A very important advantage of LCoS display technology is that it can display high-resolution images in a small screen content.

The structure of LCoS is to grow transistors on single crystal silicon, use semiconductor integration to make driving panels, and then grind the transistors flat by grinding technology, and coat aluminum film electrodes on them as mirrors to form CMOS active dot matrix substrates. Then the CMOS substrate and the upper glass substrate containing the ITO transparent electrode are bonded, and then injected into the liquid crystal and packaged in a row. Phase LCoS has a resolution of 1920*1080 and is controlled by a LETO spatial light modulator (SLM). The pitch of each pixel of phase-type LCoS is 6.4 microns, the gap between pixels is 0.2 microns, the aperture ratio reaches 93%, and the reflectivity reaches 75%. The LETO phase modulator is placed externally as an LCoS controller and connected to the computer graphics card via an HDMI cable, and does not require additional software or dedicated hardware to control. If further calibration of the LETO device is required, a standard USB connection is required. The device provides 256 gray levels to respond to the wavelength specified by the user. The correction software provided can adjust the response within 2π to make the device adapt to different wavelengths.

The image signals input to the phase-type LCoS are all obtained by calculating the holography method, and the most basic one is the GS (Gerchberg-Saxton) algorithm. The basic idea of the GS algorithm is: the initial phase and the given incident light field distribution are known, and the output plane light field distribution is obtained by performing forward diffraction transformation; restrictive conditions are introduced in the output plane, that is, the expected light field amplitude distribution Replace the original light field amplitude distribution while keeping the phase constant; then perform inverse diffraction transformation to obtain the input plane light field distribution; introduce restrictions on the input plane, that is, replace the original light field amplitude distribution with a given light field amplitude distribution, and at the same time Keep the phase unchanged; then do forward diffraction transformation again, and so on, until a satisfactory result is obtained or a sufficient number of cycles is reached. Since LCoS has a discrete pixel structure that can be considered as a grating structure, zero-order bright spots will inevitably be formed in LCoS imaging.

Contents of the invention

The purpose of the present invention is to provide a phase-type LCoS image signal processing method and a near-eye display system. LCoS imaging systems have been mostly used in projection systems in the past. The present invention improves the previous projection systems and proposes a new LCoS-based image signal processing method. The near-eye display system, and through a series of methods to increase the field of view of the system, properly improve the clarity.

The existing GS algorithm has a fast convergence speed in the first few iterations, but then the convergence speed slows down greatly. The image signal processing method of the present invention is also properly adjusted on the basis of the GS algorithm, and some parameters are introduced to control its error function and improve the convergence speed to meet the requirements of the present invention.

Most of the kinoforms of the input phase-type LCoS in the present invention are calculated by the GS algorithm or its improved algorithm. The GS algorithm performs Fourier transform back and forth iteratively between the object plane and the spectral plane, and imposes known constraints on the object plane and the spectral plane, so this algorithm is also called iterative Fourier transform algorithm.

In order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is as follows:

A phase-type LCoS image signal processing method, comprising:

Step 1: Generate the object surface wave function corresponding to the initial image A represents the amplitude of the incident light, Represents the initial phase, i represents the imaginary unit, which has no actual physical meaning;

Step 2: Substitute the initial object surface wave function f _n into the Kirchhoff diffraction integral formula, and perform Fourier transform to obtain its spectral surface wave function u _n ;

Step 3: Use the real amplitude B of the initial image to replace the amplitude of the spectral wave function u _n to generate a new spectral wave function

Step 4: For the new spectral surface wave function Substituting Kirchhoff's inverse diffraction integral formula for inverse Fourier transform to obtain the object surface wave function f _n+1 ;

Step 5: Use the real amplitude A to replace the amplitude of the object surface wave function f _n+1 to form the object surface wave function for the next iteration

Step 6: Repeat the iterative cycle of steps 2 to 5, and judge the mean square error SSE and fitting coefficient η after each iteration until the mean square error SSE and fitting coefficient η after two adjacent iterations are less than the set Threshold, and output the object surface wave function after n iterations;

Step 7: Load the phase information of the blazed grating and the phase of the object surface wave function of n iterations, and calculate the new phase distribution as is the phase information of the blazed grating, is the phase of the object surface wave function after n iterations, That is, the phase corresponding to the image information of the input phase-type LCoS.

In step 6 of the present invention, the threshold is the variation of the mean square error after two adjacent iterations, and as an option, the iteration is stopped when the variation is less than 10%.

The present invention also provides a phase-type LCoS near-eye display system, including a light source module, a phase-type LCoS module and an image receiving module,

The light source module is used to emit laser light and generate a collimated uniform plane wave incident to the phase-type LCoS module;

The phase-type LCoS module includes a phase-type LCoS and a processing unit, and the processing unit processes the image signal input to the phase-type LCoS according to the above-mentioned phase-type LCoS image signal processing method, and the phase-type LCoS is used for display processing The image information input by the unit and reflect the light beam carrying the image information;

The image receiving module is used to collect the image information carried by the light beam reflected by the phase-type LCoS, and record the diffraction image generated by the phase-type LCoS and the projected real scene image.

In the present invention, the processing unit in the phase-type LCoS module generates image information displayed by the phase-type LCoS according to input image information and incident light beam modulation. The image receiving module superimposes and records the generated optical virtual image with the real scene, and the generated image satisfies the effect of virtual reality.

Optionally, the light source module includes sequentially arranged along the optical path: a laser for emitting a laser beam; an adjustable attenuator for adjusting the laser light intensity of the incident phase-type LCoS; The laser becomes a beam expansion and collimation mechanism that collimates a uniform plane wave. The beam expansion and collimation mechanism adjusts the diameter of the uniform spot after beam expansion by replacing pinholes of different sizes.

In the aforementioned phase-type LCoS module, the phase-type LCoS is controlled by a LETO spatial light modulator, and the LETO spatial light modulator is connected to a processing unit (such as a computer) by an HDMI cable. The required image is calculated and its kinoform is generated through the corresponding algorithm on the computer, and then the kinoform is input into the LCoS through the LETO spatial light modulator.

The kinoform needs to be obtained by calculating the holographic method. The algorithm proposed by the present invention is appropriately improved on the basis of the GS algorithm to eliminate the interference of zero-order bright spots and improve the clarity. The improved GS algorithm will be introduced in the following embodiments The process of generating a kinoform.

In the phase-type LCoS module, in order to initialize or recalibrate the parameters of LCoS, it is necessary to directly connect the LETO spatial light modulator to the computer through the USB cable, and set the wavelength parameters and adjust the phase matching through the supporting software to obtain better image output.

Preferably, a polarizing prism or a polarized beamsplitter is arranged between the beam expander collimation mechanism and the phase-type LCoS, which is used to launch the beam emitted by the beam expander collimation mechanism into the phase-type LCoS and transmit the beam reflected by the surface of the phase-type LCoS .

Preferably, a 4f system and an aperture are set between the phase-type LCoS and the image receiving module; the 4f system has two convex lenses arranged sequentially along the optical path, the focal length of the first lens is 100mm, and the focal length of the second front lens is 400mm , the back focal plane of the first lens coincides with the front focal plane of the second lens; the diaphragm is located at the back focal point of the first lens of the 4f system.

The present invention increases the angle of view by adding a 4f system, and at the same time adds a diaphragm at the central focal point of the 4f system to filter out high-order diffraction bright spots and improve imaging clarity.

The present invention also proposes to improve the phase-based LCoS near-eye display system into a binocular display system after mirroring design, and at the same time, mirroring the kinoform displayed by the mirrored LCoS can ensure that the virtual images seen by both eyes are the same.

A phase-type LCoS near-eye display system, including a frame, a light source module and a phase-type LCoS module installed in the frame;

The light source module is used to emit laser light and generate a collimated uniform plane wave incident to the phase-type LCoS module;

The phase-type LCoS module includes a phase-type LCoS and a processing unit, and the processing unit processes the image signal input to the phase-type LCoS according to the phase-type LCoS image signal processing method described in claims 1-3, and the described The phase-type LCoS is used to display the image information input by the processing unit and reflect the light beam carrying the image information. The light beam reflected by the phase-type LCoS enters the human eyes to form a binocular display.

The phase-type LCoS near-eye display system in the present invention is suitable for wearing by human eyes through the frame, and the human eyes can replace the image receiving module for binocular display; further, two sets of phase-type LCoS near-eye display systems can be used to simultaneously display the mirrored LCoS The mirror image processing of the displayed kinoform can ensure that the virtual images seen by both eyes are the same.

In order to meet the needs of binocular display of the human eye, preferably, a 4f system and an aperture are set between the phase-type LCoS and the human eye; the 4f system has two convex lenses sequentially arranged along the optical path, the first lens The focal length is 30mm, the focal length of the second front lens is 60mm, the rear focal plane of the first lens coincides with the front focal plane of the second lens; the aperture is located at the rear focal point of the first lens of the 4f system.

The present invention can also realize the binocular display of both eyes through the same phase type LCoS near-eye display system. Preferably, the first half-mirror and the second half-mirror are placed directly in front of the left and right eyes along the optical path, respectively. In order to reflect the same light intensity into the left and right eyes. Therefore, by designing the transmittance and reflectance of the two half-mirrors, it can also be ensured that both eyes see the same virtual image, while reducing design complexity.

Description of drawings

Fig. 1 is a flow chart embodiment that draws target picture kinoform based on GS algorithm;

Figure 2 is the most basic structural diagram of the phase-type LCoS near-eye display system;

Figure 3 is an embodiment of a phase-type LCoS near-eye display system that increases the field of view and removes zero-order bright spots and high-order diffraction interference;

Fig. 4 is an embodiment of the optical path design and structural adjustment of the phase-type LCoS near-eye display system applied to the binocular display;

FIG. 5 is an example of an optical path design of a phase-type LCoS near-eye display system using a single optical engine.

detailed description

The detailed description of the present invention directly or indirectly simulates the operation of the technical solution of the present invention mainly through programs, steps, logic blocks, processes or other symbolic descriptions. In the ensuing description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. Rather, the invention may be practiced without these specific details. These descriptions and representations herein are used by those skilled in the art to effectively convey the substance of their work to others skilled in the art. In other words, for the purpose of avoiding obscuring the present invention, well-known methods, procedures, components and circuits have not been described in detail since they are readily understood.

Reference herein to an "embodiment" refers to a specific feature, structure or characteristic that can be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. Furthermore, the order of blocks in a method, flowchart, or functional block diagram representing one or more embodiments does not necessarily refer to any particular order nor constitute a limitation on the invention.

Figure 1 is an embodiment based on the GS algorithm in the embodiment. The algorithm is used to generate the optical image to be displayed by the phase-type LCoS according to the input image information and the modulation of the incident light. This algorithm is a method that uses multiple iterations to solve the image kinoform. Phase recovery algorithm, the basic steps of its loop iteration are as follows:

(1) As in step 101, assign an initial value to the phase of the object-surface wave function with known real amplitude, that is, select And form the initial object surface wave function corresponding to the initial image And make the number of iterations n=0, as in step 102;

(2) Substitute the object surface wave function into the Kirchhoff diffraction integral formula, and perform Fourier transform to obtain its spectral surface wave function u _n , namely

Where λ is the wavelength of the incident light, k=2π/λ is the wave number, r is the position vector of any point on the plane wave wave surface, and θ is the angle between the light from any point to the spectrum plane and the horizontal direction;

(3) Replace the amplitude of the spectral wave function u _n with the real amplitude B of the initial image, and form a new spectral wave function with its phase, namely As in step 104;

(4) For the new spectral surface wave function Substituting Kirchhoff's inverse diffraction integral formula to perform inverse Fourier transform to obtain the object surface wave function f _n+1 , as in step 106;

(5) As in step 107, replace the amplitude of the object-surface wave function f _n+1 with the known real amplitude A, keep the phase unchanged, and form the object-surface wave function for the next iteration, namely

In the formula, Q is the clear aperture of the picture.

(6) As in step 108, the corresponding symbols are iterated, namely Then get back to step 103 and start the next iterative cycle;

(7) As in step 105, after n iterations, the light intensity distribution in the observation plane can be obtained, and the phase distribution of the picture is At this time, in order to judge the results after multiple iterations, the mean square error SSE or the fitting coefficient η is used to decide whether to stop the iteration, where

Wherein, u and v are the corresponding spatial frequencies of x and y on the spectrum plane, and ε and γ are two percentages, which are respectively taken as 5% and 95% in the present invention. As the number of iterations increases, the error decreases gradually. Can stop iteration when SEE<5% and η>95%, obtain output result, as step 109;

(8) Since LCoS has a discrete pixel structure, it can be considered as a grating structure, so LCoS imaging will inevitably form zero-order bright spots. Blazed gratings are a commonly used diffractive optical element with blazed characteristics, so using their characteristics Processing the phase obtained by the GS algorithm will effectively solve the problem of zero-order bright spots. The blazed grating generally modulates light waves with a period of 2π, readjusts the diffraction direction of light, and makes the reproduced image shift, which can avoid zero-order bright spots. According to the periodic nature of light waves, after the phase information of the blazed grating is loaded into the algorithm, its phase may exceed its period, so it is necessary to perform a modulo operation on the new phase pair 2π, and the obtained phase distribution is between 0 and 2π, Then the expression of the blazed grating can be obtained:

Where m and n are the horizontal and vertical ranges of the two-dimensional blazed grating, T is the period of the grating, and x and y represent the blazed grating loaded in the m and n directions, respectively. Bring in the phase obtained by the GS algorithm After that, the new phase distribution is obtained as As in step 110;

(9) That is, the final output phase, that is, the image information to be displayed by the phase-type LCoS, as in step 111 .

Figure 2 is a basic structural diagram of a phase-type LCoS near-eye display system. The system mainly includes a light source module, a phase LCoS module and an image receiving module. It specifically includes: laser light source 201, which can be a single color light of red, green and blue, or multiple laser composite lights. The laser is used as a light source to emit laser light into the LCoS module; adjustable attenuator 202, which is used to adjust the incident LCoS system The laser light intensity can meet the needs of different experimental light intensity. A beam expander and collimator mechanism 203, which consists of a microscopic objective lens, a pinhole and a convex lens. The laser beam converges at the pinhole after passing through the microscope objective lens, and then diverges through the collimating convex lens to become a collimated uniform plane wave. Polarizing prism or polarizing beam splitter 204 , the uniform plane wave is reflected by the polarization plane of the polarizing prism to the phase type LCo 205 . Then the light beam is reflected on the phase-type LCoS surface and then passes through the polarizing prism to the image receiving module. During this process, the light beam is polarized and becomes P wave. Half-mirror 206, light beam enters camera lens 207 after being reflected by half-mirror 206, and camera lens 207 can record the diffraction image that the LCoS reflected by half-mirror reflects and the real scene image of projection simultaneously, so namely To achieve the purpose of combining virtual image and display scene.

Fig. 3 is an embodiment of the system increasing the field of view and removing zero-order bright spots and high-order diffraction images. The main difference between Figure 3 and Figure 2 is that the image receiving system also includes laser light source 301, adjustable attenuator 302, beam expander collimation mechanism 303, polarizing prism or polarization beam splitter 304, phase type LCo305, transflective mirror 308 and camera lens 309. A 4f system 306 and a diaphragm 307 are added to the system, and the 4f system 306 is composed of two convex lenses. When the light beam passes through the first lens of the 4f system 306, it forms an image at the rear focal point of the lens. At this time, due to the diffraction characteristics of the phase-type LCoS, a multi-level diffraction pattern will be generated, and a diaphragm 307 is placed at the focal point. In the present invention, we will virtual The center position of the image is shifted from zero level to positive level, adjusting the position of the diaphragm 307 and the clear aperture can allow the positive level to pass through, and a clear image without interference can be obtained. The focal lengths of the front and rear lenses of the 4f system are exactly the same, and the field of view of the obtained image will not have a magnifying effect. Therefore, it is necessary to adjust the focal length of the lens to make the entire system magnify. This example uses the focal length of the first lens 100mm, the focal length of the second front lens is 400mm, and the rear focal plane of the first lens coincides with the front focal plane of the second lens. At this time, the image has the best magnification effect. After measurement, the field of view is 35 degrees.

Fig. 4 is an example of an optical path design of a phase-type LCoS near-eye display system applied to a binocular display. There are two sets of phase-type LCoS near-eye display systems with the same components, corresponding to the left and right eyes respectively. Each phase-type LCoS near-eye display system includes a laser light source 401, an adjustable attenuator 402, a beam expander collimation mechanism 403, a polarizing prism or a polarization beam splitter 404, a phase-type LCo405, a 4f system 406, an aperture 407 and a semi-transparent half mirror 408 . In this embodiment, for the convenience of wearing, a spectacle frame or a helmet can be provided, and each component is installed on the spectacle frame or the helmet. The human eye 409 replaces the camera lens to receive delicate images. Since human glasses are also an optical system, its principle is similar to that of a camera lens, so a clear image can also be seen by properly adjusting the position of the glasses. In order to compress the space, the parameters of the two convex lenses in the 4f system 406 need to be adjusted. The focal length of the lens far away from the human eye is 30 mm, and the focal length of the lens close to the human eye is 60 mm. Other positional relationships are the same as those in the embodiment in FIG. 3 . This design compresses the volume of the system and reduces the exit pupil distance to 15mm, which is more suitable for human eyes to wear, but the magnification effect is lower than that of the embodiment in Figure 3, and the field of view is 30 degrees. The optical systems of the left and right eyes are exactly the same, so the optical path design of the right eye is mirror-symmetrical to the position of the left eye about the bridge of the nose. When the pattern output by the optical engine of the right eye is symmetrical to the mirror image of the left eye, the virtual image seen by the two eyes will be exactly the same, so that the effect of binocular display can be achieved.

FIG. 5 is an example of an optical path design of a phase-type LCoS near-eye display system using a single optical engine. A single-phase LCoS near-eye display system is used to realize the binocular display of the left and right eyes. Including laser light source 501, adjustable attenuator 502, beam expander collimation mechanism 503, polarizing prism or polarizing beam splitter 504, phase type LCo505, 4f system 506, diaphragm 507, first half mirror 508 and second Half mirror 510. The 4f system 506 is two convex lenses, adopting the optical design described in the embodiment of FIG. 4 . After the light beam passes through the 54f system 06, it first passes through the first half mirror 508. The reflectivity of the half mirror is 30%, and the transmittance is 60%. After the light beam passes through the first half mirror 508, 30 % of the light energy is reflected to the left eye 509 of people; 60% of the light energy is transmitted to the second half mirror 510 after passing through the first half mirror 508, and the reflectivity of the half mirror is is 50%, so that the light energy reflected into the right eye 511 of the person is 30%, so that it can be guaranteed that the light intensity entering the virtual images of the two glasses is exactly the same. In order to ensure that the light intensity transmitted into the human eye in the real environment is also the same, an anti-reflection coating is coated on the side of the second half mirror 510 away from the glasses to increase the light intensity passing through the second half mirror 510. This ensures that the light intensity and image information entering the two eyes are exactly the same.

The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and all should cover Within the scope of the claims of the present invention.

Claims (10)

1. A phase type LCoS image signal processing method, characterized in that, comprising: Step 1: Generate the object surface wave function corresponding to the initial image A represents the amplitude of the incident light, Represents the initial phase, i represents the imaginary unit; Step 2: Substitute the initial object surface wave function f _n into the Kirchhoff diffraction integral formula, and perform Fourier transform to obtain its spectral surface wave function u _n ; Step 3: Use the real amplitude B of the initial image to replace the amplitude of the spectral wave function u _n to generate a new spectral wave function Step 4: For the new spectral surface wave function Substituting Kirchhoff's inverse diffraction integral formula for inverse Fourier transform to obtain the object surface wave function f _n+1 ; Step 5: Use the real amplitude A to replace the amplitude of the object surface wave function f _n+1 to form the object surface wave function for the next iteration Step 6: Repeat the iterative cycle of steps 2 to 5, and judge the mean square error SSE and fitting coefficient η after each iteration, until the mean square error SSE and fitting coefficient η after two adjacent iterations are both less than the set The threshold value, and output the object surface wave function after n iterations; Step 7: Load the phase information of the blazed grating and the phase of the object surface wave function of n iterations, and calculate the new phase distribution as is the phase information of the blazed grating, is the phase of the object surface wave function after n iterations, That is, the phase corresponding to the image information of the input phase-type LCoS. 2. phase type LCoS image signal processing method as claimed in claim 1, is characterized in that, in step 6, described threshold is the variation of mean square error SSE and fitting coefficient n after adjacent two iterations. 3. phase type LCoS image signal processing method as claimed in claim 1, is characterized in that, the expression of described blazed grating is: Among them, m and n are the horizontal and vertical ranges of the two-dimensional blazed grating, T is the period of the grating, and x and y represent the blazed grating loaded in the m and n directions, respectively. 4. A phase-type LCoS near-eye display system, characterized in that it comprises a light source module, a phase-type LCoS module and an image receiving module, The light source module is used to emit laser light and generate a collimated uniform plane wave incident to the phase-type LCoS module; The phase-type LCoS module includes a phase-type LCoS and a processing unit, and the processing unit processes the image signal input to the phase-type LCoS according to the phase-type LCoS image signal processing method described in claims 1-3, and the described Phase-type LCoS is used to display the image information input by the processing unit and reflect the beam carrying the image information; The image receiving module is used to collect the image information carried by the light beam reflected by the phase-type LCoS, and record the diffraction image generated by the phase-type LCoS and the projected real scene image. 5. phase type LCoS near-eye display system as claimed in claim 4, is characterized in that, The light source module includes sequentially arranged along the optical path: a laser for emitting a laser beam, An adjustable attenuator for adjusting the laser light intensity of the incident phase-type LCoS, A beam expansion collimation mechanism used to transform the laser incident on the phase-type LCoS into a collimated uniform plane wave. 6. The phase-type LCoS near-eye display system as claimed in claim 5, wherein a polarizing prism or a polarized beam splitter is arranged between the beam expander collimation mechanism and the phase-type LCoS for transmitting the beam expander collimation mechanism The outgoing beam enters the phase-type LCoS and transmits the beam reflected by the surface of the phase-type LCoS. 7. The phase-type LCoS near-eye display system as claimed in claim 4, wherein a 4f system and an aperture are set between the phase-type LCoS and the image receiving module; The 4f system has two convex lenses arranged sequentially along the optical path, the focal length of the first lens is 100mm, the focal length of the second front lens is 400mm, and the rear focal plane of the first lens coincides with the front focal plane of the second lens; The diaphragm is located at the back focus of the first lens of the 4f system. 8. A phase-type LCoS near-eye display system, characterized in that it includes a mirror frame and a light source module and a phase-type LCoS module installed in the mirror frame; The light source module is used to emit laser light and generate a collimated uniform plane wave incident to the phase-type LCoS module; The phase-type LCoS module includes a phase-type LCoS and a processing unit, and the processing unit processes the image signal input to the phase-type LCoS according to the phase-type LCoS image signal processing method described in claims 1-3, and the described The phase-type LCoS is used to display the image information input by the processing unit and reflect the light beam carrying the image information. The light beam reflected by the phase-type LCoS enters the human eyes to form a binocular display. 9. The phase-type LCoS near-eye display system as claimed in claim 8, wherein a 4f system and a diaphragm are set between the phase-type LCoS and the human eye; The 4f system has two convex lenses arranged sequentially along the optical path, the focal length of the first lens is 30 mm, the focal length of the second front lens is 60 mm, and the rear focal plane of the first lens coincides with the front focal plane of the second lens; The diaphragm is located at the back focus of the first lens of the 4f system. 10. The phase-type LCoS near-eye display system as claimed in claim 9, wherein a first half mirror and a second half mirror are placed directly in front of the left and right eyes along the optical path, respectively, for reflecting the same The light intensity enters the left and right eyes.