CN217639767U

CN217639767U - Holographic near-to-eye display system

Info

Publication number: CN217639767U
Application number: CN202221727197.5U
Authority: CN
Inventors: 郝成龙; 谭凤泽; 朱瑞; 朱健
Original assignee: Shenzhen Metalenx Technology Co Ltd
Current assignee: Shenzhen Metalenx Technology Co Ltd
Priority date: 2022-07-06
Filing date: 2022-07-06
Publication date: 2022-10-21
Anticipated expiration: 2032-07-06

Abstract

The utility model provides a nearly eye display system of holographic formula, wherein, this nearly eye display system of holographic formula includes: the system comprises a light source module, a spatial light modulator, a first super lens, a second super lens and a projection lens; the spatial light modulator is arranged on the light emitting side of the light source module and used for generating an imaging light beam; the spatial light modulator is positioned on the object focal plane of the first superlens; the second super lens is arranged on the light-emitting side of the first super lens, and the image space focus of the first super lens is superposed with the object space focus of the second super lens; the focal length of the first super lens is larger than that of the second super lens; the projection lens is arranged on the light emergent side of the second superlens; the imaging light beam sequentially passes through the first super lens and the second super lens, and a real image is generated at the entrance pupil of the projection lens; the projection optics are used to converge the real image. The first super lens and the second super lens adopted by the holographic near-eye display system can form a 4f system, so that the field angle is enlarged, and the holographic near-eye display system has the advantages of light weight and thin overall thickness.

Description

Holographic near-to-eye display system

Technical Field

The utility model relates to a near-to-eye display technology field particularly, relates to a holographic formula near-to-eye display system.

Background

Currently, in conventional holographic near-to-eye display systems, a relay system (e.g., an optical element comprising two conventional lenses) can be used to reduce the pixel size of the spatial light modulator, thereby expanding the field angle. However, in the existing relay system, the thickness of the traditional lens is large, so that high alignment precision is difficult to achieve, and the traditional lens is difficult to popularize and use in a large range.

SUMMERY OF THE UTILITY MODEL

To solve the above problem, an embodiment of the present invention provides a holographic near-eye display system.

The embodiment of the utility model provides a holographic formula near-to-eye display system, include: the system comprises a light source module, a spatial light modulator, a first super lens, a second super lens and a projection lens; the light source module is used for emitting an initial light beam; the spatial light modulator is arranged on the light emitting side of the light source module and used for performing wavefront modulation on the initial light beam to generate an imaging light beam; the first super lens is arranged on the light-emitting side of the spatial light modulator, and the spatial light modulator is positioned on the object focal plane of the first super lens; the second super lens is arranged on the light-emitting side of the first super lens, and the image space focus of the first super lens is superposed with the object space focus of the second super lens; the focal length of the first superlens is larger than that of the second superlens; the projection lens is arranged on the light emergent side of the second superlens; the imaging light beam sequentially passes through the first super lens and the second super lens, and a real image is generated at the entrance pupil of the projection lens; the projection lens is used for converging the real image.

Optionally, the holographic near-eye display system further comprises: a diaphragm disposed coaxially with the first superlens and the second superlens; the diaphragm is positioned on the image space focal plane of the first super lens and the object space focal plane of the second super lens; the diaphragm is used for enabling the imaging light beam emitted out of the first super lens to be modulated into a chief ray angle smaller than 8 degrees through the diaphragm and emit to the second super lens, and the diaphragm enables the imaging light beam emitted out of the second super lens to have a chief ray angle smaller than 8 degrees in an image space of the second super lens.

Optionally, the holographic near-eye display system further comprises: a spacer layer; the spacing layer is arranged between the first superlens and the second superlens and used for packaging the first superlens and the second superlens into an integral structure.

Optionally, the holographic near-eye display system further comprises: a first reflector; the first reflector is arranged at the intersection point of the main optical axis of the first super lens and the main optical axis of the second super lens, and the first reflector is inclined to the main optical axis of the first super lens; the first reflector is used for deflecting the optical path of the imaging light beam which is emitted out of the first super lens and enabling the imaging light beam to be emitted into the second super lens.

Optionally, the first superlens comprises: a first substrate and first nanostructures arranged on one side of the first substrate; the second superlens includes: a second substrate and second nanostructures arranged on one side of the second substrate; one side of the first substrate includes: the light incident side or the light emergent side of the first substrate; one side of the second substrate includes: the light incident side or the light emergent side of the second substrate.

Optionally, the light source module includes: a narrow band laser or narrow band light emitting diode capable of emitting a beam of one color; the first and second superlenses include a superlens for removing monochromatic aberration.

Optionally, the light source module includes: n monochromatic narrow-band lasers with different central wavelengths and an N-1 spectroscope; n is greater than or equal to 3; after being split by the corresponding spectroscopes, the lasers generated by the N-1 monochromatic narrow-band lasers are combined with the laser generated by one monochromatic narrow-band laser which is not split by the spectroscope to generate the initial light beam, and the light beams generated by the N monochromatic narrow-band lasers comprise a blue light beam, a green light beam and a red light beam; the first superlens and the second superlens comprise discrete wavelength chromatic aberration correcting superlenses.

Optionally, the light source module includes: n monochromatic narrow-band lasers with different central wavelengths, a second reflecting mirror and N-1 spectroscopes; n is greater than or equal to 3; after being split by the corresponding spectroscope, the laser generated by the N-1 monochromatic narrow-band lasers is combined with the laser generated by the monochromatic narrow-band laser reflected by the second reflecting mirror to generate the initial light beam, and the light beams generated by the N monochromatic narrow-band lasers comprise a blue light beam, a green light beam and a red light beam; the first superlens and the second superlens comprise discrete wavelength chromatic aberration correcting superlenses.

Optionally, the light source module includes: two blue lasers, a fluorescent material turntable and two spectroscopes; one said blue laser for producing a blue beam; the other blue laser is used for irradiating the fluorescent material turntable to excite and generate two light beams with the wavelength larger than that of the blue light beam; the blue light beam and the two light beams with the wavelengths larger than that of the blue light beam are split by the spectroscope to generate the initial light beam; the first superlens and the second superlens comprise discrete wavelength chromatic aberration correcting superlenses.

Optionally, the light source module includes: n monochromatic narrow-band light-emitting diodes and N-1 spectroscopes; n is greater than or equal to 3; after being split by the spectroscope, light beams generated by N-1 monochromatic narrow-band light-emitting diodes are combined with a light beam generated by one monochromatic narrow-band light-emitting diode which is not split by the spectroscope to generate the initial light beam, and the light beams generated by the N monochromatic narrow-band light-emitting diodes comprise a blue light beam, a green light beam and a red light beam; the first superlens and the second superlens comprise discrete wavelength chromatic aberration correcting superlenses.

Optionally, the light source module includes: n monochromatic narrow-band light-emitting diodes with different central wavelengths, a second reflecting mirror and N-1 spectroscopes; n is greater than or equal to 3; after being split by the corresponding spectroscope, the laser generated by the N-1 monochromatic narrow-band light-emitting diodes is combined with the laser generated by the monochromatic narrow-band laser reflected by the second reflecting mirror to generate the initial light beam, and the light beams generated by the N monochromatic narrow-band light-emitting diodes comprise a blue light beam, a green light beam and a red light beam; the first superlens and the second superlens comprise discrete wavelength chromatic aberration correcting superlenses.

Optionally, the beam splitter comprises a dichroic mirror.

Optionally, the light source module further includes: a beam amplifier; the beam amplifier is used for expanding the initial light beam.

Optionally, the spatial light modulator comprises: a transmissive spatial light modulator or a reflective spatial light modulator.

Optionally, the projection optics comprises: an achromatic superlens.

The embodiment of the utility model provides in the above-mentioned scheme that provides, the embodiment of the utility model provides an adopt first super lens and the super lens of second, compare in the nearly eye display system of holographic formula that uses traditional lens, this nearly eye display system of holographic formula has possessed and has aimed at the precision height, the quality is light, whole thickness is thin, the system is simple, the price is lower and the advantage that the productivity is high, more accords with the market demand.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of a holographic near-eye display system provided by an embodiment of the present invention;

fig. 2 is a partially enlarged schematic view of a holographic near-eye display system provided by an embodiment of the present invention;

fig. 3 is a schematic diagram illustrating a position of a diaphragm in a holographic near-eye display system according to an embodiment of the present invention;

fig. 4 is a schematic diagram illustrating a position of a spacer layer in a holographic near-eye display system provided by an embodiment of the present invention;

fig. 5 is a schematic diagram illustrating a position of a reflector in a holographic near-eye display system according to an embodiment of the present invention;

fig. 6 is a schematic diagram illustrating a first nanostructure and a second nanostructure respectively disposed on light-emitting sides of a first substrate and a second substrate in a holographic near-eye display system provided by an embodiment of the present invention;

fig. 7 is a schematic diagram illustrating a holographic near-eye display system according to an embodiment of the present invention, in which a first nanostructure is disposed opposite to a second nanostructure;

fig. 8 is a schematic diagram illustrating a first nanostructure and a second nanostructure respectively disposed on light incident sides of a first substrate and a second substrate in a holographic near-eye display system provided by an embodiment of the present invention;

fig. 9 is a schematic diagram illustrating a holographic near-eye display system according to an embodiment of the present invention, in which a first nanostructure is disposed opposite to a second nanostructure;

fig. 10 is a schematic diagram illustrating a light source module capable of emitting a color light beam in a holographic near-to-eye display system according to an embodiment of the present invention;

fig. 11 is a schematic diagram illustrating a holographic near-eye display system according to an embodiment of the present invention, in which a light source module includes N monochromatic narrowband lasers with different center wavelengths and N-1 beam splitters;

fig. 12 is a schematic diagram illustrating a holographic near-eye display system according to an embodiment of the present invention, in which a light source module includes N monochromatic narrowband lasers with different center wavelengths, N-1 beam splitters, and a reflector;

fig. 13 is a schematic diagram illustrating a holographic near-eye display system according to an embodiment of the present invention, in which a light source module includes two blue lasers, a fluorescent material turntable, and two beam splitters;

fig. 14 is a schematic diagram illustrating a holographic near-eye display system according to an embodiment of the present invention, in which a light source module includes N narrow-band leds and N-1 spectroscopes;

fig. 15 is a schematic view illustrating a holographic near-eye display system according to an embodiment of the present invention, in which a light source module includes N narrow-band light emitting diodes, N-1 beam splitters, and a reflector;

fig. 16 is a schematic diagram illustrating an overall structure of a holographic near-eye display system according to an embodiment of the present invention;

fig. 17 is a schematic diagram illustrating an overall structure of another holographic near-eye display system provided in an embodiment of the present invention.

Icon:

the light source comprises a 1-light source module, a 2-spatial light modulator, a 3-first super lens, a 4-second super lens, a 5-projection lens, a 6-diaphragm, a 7-spacing layer, an 8-first reflector, an 11-monochromatic narrow-band laser, a 12-spectroscope, a 13-blue laser, a 14-fluorescent material turntable, a 16-monochromatic narrow-band light-emitting diode, an 18-beam amplifier, a 19-second reflector, a 31-first substrate, a 32-first nanostructure, a 41-second substrate and a 42-second nanostructure.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

The embodiment of the utility model provides a holographic near-to-eye display system, it is shown with reference to fig. 1, holographic near-to-eye display system includes: the system comprises a light source module 1, a spatial light modulator 2, a first super lens 3, a second super lens 4 and a projection lens 5; fig. 1 shows the right side of the light source module 1 as the light emitting side.

As shown in fig. 1, the light source module 1 is used for emitting an initial light beam; the spatial light modulator 2 is arranged on the light emitting side of the light source module 1 and used for performing wavefront modulation on the initial light beam to generate an imaging light beam; the first super lens 3 is arranged on the light-emitting side of the spatial light modulator 2, and the spatial light modulator 2 is positioned on the object focal plane of the first super lens 3; the second super lens 4 is arranged on the light-emitting side of the first super lens 3, and the image space focus of the first super lens 3 is superposed with the object space focus of the second super lens 4; the focal length of the first superlens 3 is greater than that of the second superlens 4; the projection lens 5 is arranged on the light-emitting side of the second superlens 4; the imaging light beam sequentially passes through the first super lens 3 and the second super lens 4, and a real image is generated at the entrance pupil of the projection lens 5; the projection optics 5 are used to converge the real image.

The embodiment of the utility model provides an among the holographic near-to-eye display system, light source module 1 can be to setting up the spatial light modulator 2 transmission initial beam in its light-emitting side, and this initial beam can be monochromatic light beam or polychromatic light beam (like the light beam that a plurality of monochromatic light beams mix), and, this light source module 1 can be laser source, perhaps it also can be ordinary light source, the embodiment of the utility model provides a do not limit to this, can select correspondingly according to the actual demand. The spatial modulator 2 is a device capable of loading information (e.g., depth information) onto one or two-dimensional optical data fields to efficiently utilize the inherent speed, parallelism, and interconnection capabilities of the light. The embodiment of the present invention provides an embodiment, this spatial modulator 2 can carry out wavefront modulation (if calculate and load the display image that has depth information) to the initial light beam of incidenting wherein, jets out the image forming light beam for the image forming light beam who jets out can keep away from light source module 1 at this spatial modulator 2 one side and generate the display image that has depth information, like three-dimensional stereo image. Alternatively, the spatial modulator 2 may comprise a transmissive spatial light modulator or a reflective spatial light modulator. The transmission-type spatial light modulator can control the amplitude of incident light pixel by pixel, and can be widely applied to various fields requiring high-speed amplitude modulation, such as spectral analysis, image processing and analysis, projection and imaging, programmable amplitude masks, dynamic scene simulation and the like; the reflective spatial light modulator is characterized by high filling factor and high diffraction efficiency, and can realize the fields of precise phase modulation optical control, wave-front correction, optical tweezers, beam shaping and control, programmable phase masks, holographic reconstruction and the like for light waves according to the requirements of users. Above-mentioned two kinds of spatial light modulator 2 all are applicable to the utility model discloses the holographic formula near-to-eye display system that provides specifically can select according to actual need. Wherein, the number of pixels on the spatial light modulator 2 can be larger than 800 × 600, and the size of a single pixel can be smaller than 30 μm to ensure the imaging effect.

Wherein, be provided with first superlens 3 in spatial light modulator 2's light-emitting side, and this spatial light modulator 2 and the positional relationship of this first superlens 3 are: the spatial light modulator 2 is located at the object focal plane of the first superlens 3, for example, the spatial light modulator 2 may generate an imaging light beam at the object focal plane position of the first superlens 3, and obtain a display image with depth information at the object focal plane position of the first superlens 3, where the imaging light beam can be incident into the first superlens 3.

The embodiment of the utility model provides an in, be provided with the super lens 4 of second in the light-emitting side of first super lens 3, this first super lens 3 can be with the formation of image light beam directive that jets into wherein in this super lens 4 of second. Wherein the image-side focal point (image-side principal focal point, focal point on the principal optical axis of the first superlens 3) of the first superlens 3 coincides with the object-side focal point (object-side principal focal point, focal point on the principal optical axis of the second superlens 4) of the second superlens 4, for example, the first superlens 3 and the second superlens 4 have a common focal point on the respective principal optical axes. Wherein the focal length f of the first superlens 3 ₁ Larger than the focal length f of the second superlens 4 ₂ For example, the distance from the first superlens 3 to the common focal point is greater than the distance from the second superlens 4 to the common focal point. When the imaging light beam sequentially enters and passes through the first super lens 3 and the second super lens 4, the imaging light beam can generate a real image on the light emergent side of the second super lens 4, and the real image is a real image corresponding to a display image with depth information generated by the spatial light modulator 2; wherein the position for generating the real image is the image side focal plane of the second superlens 4.

The first superlens 3 and the second superlens 4 in the embodiment of the present invention constitute a 4f system (a linear optical information processing system, see fig. 2), which can make the imaging light beam incident into the 4f system from the object space focal plane position of the 4f system (e.g. the object space focal plane position of the first superlens 3) form a real image at the image space focal plane position of the 4f system (e.g. the image space focal plane position of the second superlens 4); in addition, since the focal length of the first superlens 3 is larger than that of the second superlens 4, the 4f system can reduce the pixels of the display image having depth information generated by the spatial light modulator 2 to f, which is the original pixel size ₂ /f ₁ A multiple of, wherein, f ₁ Showing the first superlens 3Focal length, f ₂ Indicating the focal length of the second superlens 4.

As shown in fig. 1, in the embodiment of the present invention, the projection lens 5 is disposed on the light-emitting side of the second super lens 4, and the real image generated by the second super lens 4 is located at the entrance pupil position of the projection lens 5, i.e. the image focal plane of the second super lens 4 coincides with the entrance pupil position of the projection lens 5. The projection lens 5 is a lens capable of realizing a focusing function, for example, the projection lens 5 is capable of converging a real image generated by the second superlens 4 to a pupil. Wherein, referring to fig. 1, the projection lens 5 may be a conventional lens; alternatively, the projection lens 5 includes an achromatic superlens, for example, the projection lens 5 may be a superlens group formed by combining two superlenses made of different materials, and the projection lens 5 may focus light of different colors to the same point to correct chromatic aberration. The embodiment of the utility model provides an adopt super lens that can achromatism as projection lens 5, not only make this holographic formula near-to-eye display system can eliminate the colour difference, still can make its structure more slender, alleviate whole weight.

In the embodiment of the present invention, based on the angle of view formula

And

it can be confirmed that under the condition that theta and lambda are unchanged, the purpose of increasing the field angle FOV can be achieved by reducing p; wherein λ represents the wavelength of the primary beam; p represents the period, as pixels of the display image generated by the spatial light modulator 2; θ represents an incident angle of the initial beam upon the spatial light modulator 2; m denotes d between the projection lens 5 and the pupil _eye Distance d from real image and projection lens 5 _slm The ratio therebetween. Therefore, the embodiment of the present invention provides a holographic near-to-eye display system, which can utilize the combination of the first super lens 3 and the second super lens 4 to obtain a 4f system, and the holographic near-to-eye display systemThe 4f system can reduce the pixels p of the display image (composed of the imaging light beam) generated by the spatial light modulator 2, that is, generate a real image of the display image with reduced pixels, thereby expanding the field angle FOV; and, the embodiment of the utility model provides an adopt first super lens 3 and super lens 4 of second, compare in the nearly eye display system of holographic formula that uses traditional lens, this nearly eye display system of holographic formula has still possessed alignment accuracy height, the quality is light, whole thickness is thin, the system is simple, the price is lower and the advantage that the productivity is high, more accords with the market demand.

Optionally, referring to fig. 3, the holographic near-eye display system further comprises: a diaphragm 6 disposed coaxially with the first and

second superlenses

3 and 4; the diaphragm 6 is positioned in the image space focal plane of the first super lens 3 and the object space focal plane of the second super lens 4; the right side of the first superlens 3 is shown as its light exit side in fig. 2.

As shown in fig. 3, the diaphragm 6 is used for making the chief ray angle of the imaging light beam exiting from the first superlens 3 smaller than 8 ° modulated by the diaphragm 6 and emitted to the second superlens 4, and the diaphragm 6 is used for making the chief ray angle of the imaging light beam exiting from the second superlens 4 smaller than 8 ° in the image space of the second superlens 4.

In practical applications, due to errors such as aberration or distortion existing in the first super lens 3 and the second super lens 4, a chief ray of an imaging light beam emitted by the first super lens 3 (a light beam parallel to a chief axis of the first super lens 3) and a chief ray of an imaging light beam emitted by the second super lens 4 (a light beam parallel to a chief axis of the second super lens 4) cannot be perfectly parallel to the chief axis, and a certain deviation angle is usually generated, so that the finally generated real image also has a problem of uneven illumination. For example, in the embodiment of the present invention, the chief ray angle of the first super lens 3 can be the chief ray angle in the image space thereof, i.e. the chief ray angle in the space where the image space focus of the first super lens 3 is located (the angle of the chief ray in the imaging beam emitted from the first super lens 3 deviating from the chief ray axis); accordingly, the chief ray angle of the second superlens 4 may also be the chief ray angle in its image space, i.e. the chief ray angle in the space where the image-side focal point of the second superlens 4 is located (the angle at which the chief ray in the imaging light beam emitted therefrom deviates from the chief ray axis). The smaller the chief ray angle corresponding to the super lens is, the better the parallelism of the chief rays emitted by the super lens is, the better the aberration can be corrected, and the more accurate the real image generated finally.

Therefore, in order to correct the aberration of two super lenses, the embodiment of the present invention provides a holographic near-to-eye display system, which comprises a diaphragm 6 disposed between the first super lens 3 and the second super lens 4, and the diaphragm 6, the first super lens 3 and the second super lens 4 are coaxially disposed, i.e. the main optical axis of the first super lens 3, the main optical axis of the second super lens 4 and the main optical axis of the diaphragm 6 are mutually overlapped. The stop 6 is specifically disposed on a plane where an image-side focal plane of the first superlens 3 and an object-side focal plane of the second superlens 4 are located together, for example, a distance between the stop 6 and the first superlens 3 is equal to a focal length of the first superlens 3, and a distance between the stop 6 and the second superlens 4 is equal to a focal length of the second superlens 4.

The embodiment of the utility model provides a holographic near-to-eye display system for this first super lens 3 constitutes two sides heart far away super lens with second super lens 4, utilize this diaphragm 6 to control the light quantity of the formation of image light beam that first super lens 3 jetted out, and cooperate first super lens 3 and the modulation of second super lens 4 to the formation of image light beam phase place respectively through this diaphragm 6, make the formation of image light beam that this first super lens 3 jetted out can be less than 8 with its chief ray angle from diaphragm 6, and make the formation of image light beam that this second super lens 4 jetted out also can be less than 8 with its chief ray angle and jet out, this diaphragm 6 can make the chief ray angle of this first super lens 3 and second super lens 4 diminish promptly, make the chief ray of the formation of image light beam that first super lens 3 and second super lens 4 jetted out respectively be more parallel to the principal axis, and then eliminate aberration and distortion that this first super lens 3 and second super lens 4 had, make the real image precision that becomes even, the real image precision is improved. Wherein the aberration correction includes monochromatic off-axis aberration (e.g., spherical aberration, coma, astigmatism, curvature of field, and partial distortion) correction, and/or chromatic aberration correction at multiple discrete wavelengths.

Optionally, referring to fig. 4, the holographic near-eye display system further comprises: a spacer layer 7; the spacer layer 7 is arranged between the first superlens 3 and the second superlens 4 for encapsulating the first superlens 3 and the second superlens 4 into an integral structure.

Wherein the first superlens 3 and the second superlens 4 may be packaged with a spacer layer 7, e.g. wafer level packaging. The spacer layer 7 may be arranged vertically between the coaxial first superlens 3 and the second superlens 4 as shown in fig. 4, so that they form an integral structure. In the embodiment of the present invention, among the first super lens 3 and the second super lens 4 of the structure as a whole encapsulated by the spacer layer 7, air or other medium filler can be included, and the embodiment of the present invention is not limited to this. The embodiment of the utility model provides a holographic formula near-to-eye display system for because of first super lens 3 and the fixed encapsulation of second super lens 4 by spacer layer 7 for its alignment accuracy is higher.

Optionally, referring to fig. 5, the holographic near-eye display system further comprises: a first reflecting mirror 8; the first reflector 8 is arranged at the intersection point of the main optical axis of the first super lens 3 and the main optical axis of the second super lens 4, and the first reflector 8 is inclined to the main optical axis of the first super lens 3; the right side of the first superlens 3 is shown as its light exit side in fig. 5. The first mirror 8 is used to deflect the optical path of the imaging light beam exiting the first superlens 3 and to cause the imaging light beam to enter the second superlens 4.

As shown in fig. 5, the second super lens 4 is not parallel to the main optical axis of the first super lens 3, for example, the main optical axis of the second super lens 4 is perpendicular to the main optical axis of the first super lens 3, and the intersection point between the main optical axis of the second super lens 4 and the main optical axis of the first super lens 3 is the coincidence position of the object focus of the second super lens 4 and the image focus of the first super lens 3, the embodiment of the present invention can set the first reflector 8 at the coincidence position, and the first reflector 8 is used to change the optical path of the imaging beam emitted through the first super lens 3, so as to turn the imaging beam and emit the imaging beam into the second super lens 4 vertically disposed with the first super lens 3. The main optical axes of the first super lens 3 and the second super lens 4 are symmetrical along the normal of the first reflector 8, so that the light parallel to the main optical axis of the first super lens 3 is formed after being reflected by the first reflector 8, and the light parallel to the main optical axis of the second super lens 4 is formed.

The embodiment of the utility model provides a can utilize first speculum 8, the change jets out the light path of the imaging beam of first super lens 3, make first super lens 3 and the super lens 4 of second can not coaxial setting, for example, can satisfy the structure that first super lens 3 and the super lens 4 mutually perpendicular of second set up, and this kind of structure can be better be applicable to in the practical application, for example, can set up some (as light source module 1, spatial light modulator 2 and first super lens 3) of this holographic near-to-eye display system on the glasses mirror leg, and set up its another part (as super lens 4 of second, projection lens 5) in glasses mirror position department, save and set up the space, make this holographic near-to-eye display system compacter.

Alternatively, referring to fig. 6 to 9, the first superlens 3 includes: a first substrate 31 and first nanostructures 32 arranged at one side of the first substrate 31; the second superlens 4 includes: a second substrate 41 and second nanostructures 42 arranged on one side of the second substrate 41; one side of the first substrate 31 includes: the light incident side or the light exit side of the first substrate 31; one side of the second substrate 41 includes: the light entrance side or the light exit side of the second substrate 41.

The first substrate 31 of the first super lens 3 and the second substrate 41 of the second super lens 4 can be made of quartz glass, crown glass, flint glass, and other transparent materials. A first nanostructure 32 and a second nanostructure 42 are correspondingly disposed on any side of the first substrate 31 and any side of the second substrate 41 (for example, the light incident side or the light emergent side of the first substrate 31, the light incident side or the light emergent side of the second substrate 41), the first nanostructure 32 and the second nanostructure 42 can be highly uniform nanostructures, and both the first nanostructure 32 and the second nanostructure 42 can be all-dielectric structural units, and have high transmittance in the operating band, and the materials selectable by these nanostructures include: titanium oxide, silicon nitride, fused silica, aluminum oxide, gallium nitride, gallium phosphide, amorphous silicon, crystalline silicon, hydrogenated amorphous silicon, and the like.

The embodiment of the present invention can select the specific setting position of the first nano structure 32 and the second nano structure 42 according to the actual requirement. As shown in fig. 6, the first nanostructure 32 included in the first superlens 3 is disposed on the light-emitting side of the first substrate 31 (the right side of the first substrate 31 in fig. 6), and the second nanostructure 42 included in the second superlens 4 is disposed on the light-emitting side of the second substrate 41 (the right side of the second substrate 41 in fig. 6), so that the arrangement directions of the first nanostructure 32 and the second nanostructure 42 are the same; alternatively, as shown in fig. 7, the first nanostructure 32 included in the first superlens 3 is disposed on the light-emitting side of the first substrate 31 (the right side of the first substrate 31 in fig. 7), and the second nanostructure 42 included in the second superlens 4 is disposed on the light-entering side of the second substrate 41 (the left side of the second substrate 41 in fig. 7), so that the first nanostructure 32 and the second nanostructure 42 are disposed opposite to each other; alternatively, as shown in fig. 8, the first nanostructure 32 included in the first superlens 3 is disposed on the light incident side of the first substrate 31 (left side of the first substrate 31 in fig. 8), and the second nanostructure 42 included in the second superlens 4 is disposed on the light incident side of the second substrate 41 (left side of the second substrate 41 in fig. 8), so that the arrangement directions of the first nanostructure 32 and the second nanostructure 42 are the same; still alternatively, as shown in fig. 9, the first nanostructure 32 included in the first superlens 3 is disposed on the light incident side of the first substrate 31 (left side of the first substrate 31 in fig. 9), and the second nanostructure 42 included in the second superlens 4 is disposed on the light emergent side of the second substrate 41 (right side of the second substrate 41 in fig. 9), so that the first nanostructure 32 and the second nanostructure 42 are disposed oppositely, for example, they are disposed opposite to each other.

Alternatively, referring to fig. 10, the light source module 1 includes: a narrow band laser or narrow band light emitting diode capable of emitting a beam of one color; the first and

second superlenses

3 and 4 include a superlens for removing monochromatic aberration.

The embodiment of the utility model provides an among the holographic near-to-eye display system that provides, this light source module 1 can be including the narrowband laser that can launch a colour light beam, perhaps can launch the narrowband emitting diode of a colour light beam for this holographic near-to-eye display system is monochromatic holographic near-to-eye display system. As shown in fig. 10, the narrow-band laser is a continuous laser light source with good monochromaticity, and the bandwidth corresponding to the emitted laser beam (such as the initial beam) is small, for example, generally less than 5% of the central wavelength; similarly, the narrow-band led is a continuous ordinary light source with good monochromaticity, and emits an ordinary light beam (such as an initial light beam) with a relatively small bandwidth, for example, generally less than 5% of the central wavelength. The embodiment of the utility model provides an in, the light beam of arbitrary a colour can be launched to narrowband laser instrument or narrowband emitting diode, for example blue light beam, green light beam or red light beam, the embodiment of the utility model provides a do not limit to this. In addition, since the holographic near-eye display system is a monochromatic holographic near-eye display system, the first superlens 3 and the second superlens 4 are monochromatic superlenses, for example, the first superlens 3 and the second superlens 4 are superlenses capable of eliminating the aberration generated by a light beam of a certain color (e.g., the initial light beam emitted by the light source module 1).

Alternatively, referring to fig. 11, the light source module 1 includes: n monochromatic narrow-band lasers 11 with different central wavelengths and N-1 beam splitters 12; n is greater than or equal to 3; after being split by the corresponding beam splitter 12, the laser generated by the N-1 monochromatic narrow-band lasers 11 is overlapped with the laser generated by one monochromatic narrow-band laser 11 which is not split by the beam splitter 12 to generate an initial light beam, and the light beams generated by the N monochromatic narrow-band lasers 11 include a blue light beam, a green light beam and a red light beam; the first and

second superlenses

3 and 4 include discrete wavelength chromatic aberration correcting superlenses.

The embodiment of the present invention provides a holographic near-to-eye display system, in which the light source module 1 includes: n monochromatic narrowband lasers 11 with different center wavelengths, that is, N lasers capable of emitting monochromatic narrowband laser beams exist in the light source module 1, and the colors of the laser beams that can be emitted by each monochromatic narrowband laser 11 are different (for example, the wavelengths are different), so that the holographic near-eye display system is a compound-color holographic near-eye display system. The light source module 1 further comprises beam splitters 12 (N-1) which can correspond to the N-1 monochromatic narrowband lasers 11 one by one, and each beam splitter 12 can split a light beam generated by the corresponding monochromatic narrowband laser 11 (N-1) and combine the light beam with a monochromatic laser directly emitted by one monochromatic narrowband laser 11 which is not split by any beam splitter 12, so as to finally obtain an initial light beam; as shown in fig. 11, the light beam emitted from the monochromatic narrowband laser 11 can be directly emitted to the light emitting side of the light source module 1, and forms an initial light beam with the light beams respectively split by the beam splitter 12. For example, as shown in fig. 11, N is equal to 3, the light source module 1 includes three monochromatic narrow-band lasers 11, and the three monochromatic narrow-band lasers 11 are respectively used for emitting blue laser beams, green laser beams and red laser beams; alternatively, the dichroic mirror 12 may comprise a dichroic mirror, that is, the two dichroic mirrors 12 disposed opposite to the two monochromatic narrowband lasers 11 may be dichroic mirrors capable of reflecting light with corresponding wavelengths to be reflected and transmitting light with corresponding wavelengths to be transmitted. Wherein the central wavelength of the blue laser beam is 450nm, the bandwidth is 2nm, and the ratio of the bandwidth to the central wavelength is 0.44%; the central wavelength of the green laser beam is 525nm, the bandwidth is 2nm, and the ratio of the bandwidth to the central wavelength is 0.38%; the center wavelength of the red laser beam is 635nm, the bandwidth is 1nm, and the ratio of the bandwidth to the center wavelength is 0.16%.

In addition, since the holographic near-eye display system is a multi-color holographic near-eye display system, the first super lens 3 and the second super lens 4 are discrete wavelength chromatic aberration correction super lenses, for example, the first super lens 3 and the second super lens 4 are super lenses capable of eliminating chromatic aberration generated by light beams in corresponding visible light bands (such as the initial light beam emitted by the light source module 1).

The embodiment of the utility model provides a holographic near-to-eye display system, its light source module 1 can include a plurality of monochromatic narrowband laser 11 that can launch discrete wavelength light beam for the initial beam that finally obtains is the polychromatic light beam that a plurality of discrete wavelength light beams constitute, and corresponds the first super lens 3 that sets up and surpass lens 4 with the second and can eliminate the produced colour difference of this initial beam, make this holographic near-to-eye display system can have better formation of image result.

Optionally, the light source module 1 includes: n monochromatic narrow-band lasers 11 with different central wavelengths, a reflecting mirror 19 and N-1 spectroscopes 12; n is greater than or equal to 3; after being split by the corresponding beam splitter 12, the laser beams generated by the N-1 monochromatic narrow-band lasers 11 are combined with the laser beam generated by one monochromatic narrow-band laser 11 reflected by the second reflecting mirror 19 to generate an initial light beam, and the light beams generated by the N monochromatic narrow-band lasers 11 include a blue light beam, a green light beam and a red light beam; the first and

second superlenses

In the embodiment of the present invention, in the N monochromatic narrowband lasers 11 included in the light source module 1, N-1 monochromatic narrowband lasers 11 respectively correspond to N-1 spectroscopes 12 one to one, and one remaining monochromatic narrowband laser 11 may correspond to the second reflecting mirror 19. As shown in fig. 12, when N is equal to 3, that is, the light source module 1 includes 3 monochromatic narrowband lasers 11, wherein a light beam emitted by one monochromatic narrowband laser 11 may be directed to a second reflecting mirror 19 corresponding to the monochromatic narrowband laser, and light beams emitted by the other two monochromatic narrowband lasers 11 may be directed to respective dichroic mirrors 12, where the dichroic mirrors 12 may be dichroic mirrors according to requirements; the beam split by the beam splitter 12 can be combined with the beam reflected by the second reflecting mirror 19 into an initial beam.

In addition, since the holographic near-eye display system is a compound color holographic near-eye display system, the first super lens 3 and the second super lens 4 are discrete wavelength chromatic aberration correction super lenses, for example, the first super lens 3 and the second super lens 4 are super lenses capable of eliminating chromatic aberration generated by light beams in corresponding visible light bands (such as initial light beams emitted by the light source module 1).

Alternatively, referring to fig. 13, the light source module 1 includes: two blue lasers 13, a fluorescent material turntable 14 and two beam splitters 12; a blue laser 13 for generating a blue beam; another blue laser 13 is used to illuminate the fluorescent material turntable 14 to excite and generate two light beams with wavelength longer than that of the blue light beam; the blue light beam and the two light beams with the wavelength longer than that of the blue light beam are split by the spectroscope 12 to generate an initial light beam; the first and

second superlenses

The embodiment of the present invention provides a holographic near-to-eye display system, in which two blue lasers 13 included in the light source module 1 are lasers capable of emitting blue laser beams. Two beam splitters 12 are sequentially arranged on the light emitting side of one blue laser 13, and a fluorescent material turntable 14 is arranged on the light emitting side of the other blue laser 13. As shown in fig. 13, the beam splitter 12 may be a dichroic mirror as required; the beam splitter 12 close to the corresponding blue laser 13 can transmit the laser beam with the wavelength of blue light and reflect the laser beam (such as green laser beam) with the wavelength longer than that of blue light; the beam splitter 12, which is far from the blue laser 13, can transmit the laser beam with the wavelength of blue light and the laser beam with the wavelength of green light, and reflect the laser beam with the wavelength longer than the wavelength of green light (such as the red laser beam).

In the embodiment of the present invention, the blue laser 13 correspondingly provided with two spectroscopes 12 is used for generating blue laser beam, and the blue laser beam is split by two spectroscopes 12 and emitted from the last spectroscope 12 in the form of narrow-band light. Another blue laser 13 irradiates the emitted blue laser beam toward the fluorescent material turntable 14 to excite laser light of other colors (e.g., red and green). The laser beams of other colors are split by the beam splitter 12 and emitted, and finally an initial light beam (e.g., a mixed light beam of laser beams having three colors) is emitted from the beam splitter 12 disposed at the final position of the light source module 1 (e.g., near the light emitting side of the light source module 1).

In addition, since the holographic near-eye display system provided by the embodiment of the present invention is a multi-color holographic near-eye display system, the first super lens 3 and the second super lens 4 are respectively discrete wavelength chromatic aberration correction super lenses, for example, the first super lens 3 and the second super lens 4 are super lenses capable of eliminating chromatic aberration generated by light beams (such as the initial light beam emitted by the light source module 1) in corresponding visible light bands.

The embodiment of the utility model provides a holographic formula near-to-eye display system, its light source module 1 is because of having fluorescent material carousel 14 for this light source module 1 can reduce the number of monochromatic source (like blue laser 13), practices thrift the cost, makes overall structure frivolous compactness more.

Optionally, referring to fig. 14, the light source module 1 includes: n monochromatic narrow-band light-emitting diodes 16 and N-1 beam splitters 12; n is greater than or equal to 3; the light beams generated by the N-1 monochromatic narrow-band light-emitting diodes 16 are split by the beam splitter 12 and combined with the light beam generated by one monochromatic narrow-band light-emitting diode 16 which is not split by the beam splitter 12 to generate an initial light beam, and the light beams generated by the N monochromatic narrow-band light-emitting diodes 16 comprise a blue light beam, a green light beam and a red light beam; the first and

second superlenses

The embodiment of the present invention provides a holographic near-to-eye display system, in which the light source module 1 can include: the N monochromatic narrow-band light-emitting diodes 16, that is, there are N light sources capable of emitting monochromatic narrow-band ordinary light beams in the light source module 1, and the colors of the ordinary light beams that the N monochromatic narrow-band light-emitting diodes 16 can emit are different (for example, the wavelengths of the emitted ordinary light beams are different), so that the holographic near-eye display system is a compound-color holographic near-eye display system. The light source module 1 further comprises beam splitters 12 (N-1) which can correspond to the N-1 monochromatic narrow-band light-emitting diodes 16 one by one, and each beam splitter 12 can split a light beam generated by the corresponding monochromatic narrow-band light-emitting diode 16 (N-1) and combine the split light beam with a monochromatic light beam directly emitted by one monochromatic narrow-band light-emitting diode 16 which is not split by any beam splitter 12, so as to finally obtain an initial light beam; as shown in fig. 14, the light beam emitted from the monochromatic narrow-band led 16 can be directly emitted to the light-emitting side of the light source module 1, and forms an initial light beam with the light beam split by the beam splitter 12. For example, referring to FIG. 14, N is equal to 3; the light source module 1 comprises three monochromatic narrow-band light-emitting diodes 16, and the three monochromatic narrow-band light-emitting diodes 16 are respectively used for emitting blue light beams, green light beams and red light beams; the two dichroic mirrors 12 arranged with respect to the two monochromatic narrow-band leds 16 may be dichroic mirrors as desired. In addition, since the holographic near-eye display system is a compound color holographic near-eye display system, the first super lens 3 and the second super lens 4 are discrete wavelength chromatic aberration correction super lenses, for example, the first super lens 3 and the second super lens 4 are super lenses capable of eliminating chromatic aberration generated by light beams in corresponding visible light bands (such as initial light beams emitted by the light source module 1).

The embodiment of the utility model provides a holographic near-to-eye display system, its light source module 1 can include a plurality of monochromatic narrow-band emitting diode 16 that can launch discrete wavelength light beam for the initial beam that finally obtains is the polychromatic light beam that a plurality of discrete wavelength light beams constitute, and the first super lens 3 that corresponds the setting can eliminate the produced colour difference of this initial beam with the super lens 4 of second, makes this holographic near-to-eye display system can have better formation of image result.

Alternatively, referring to fig. 15, the light source module 1 includes: n monochromatic narrow-band light-emitting diodes 16 of different center wavelengths, a second reflecting mirror 19 and N-1 beam splitters 12; n is greater than or equal to 3; the laser generated by the N-1 monochromatic narrow-band light-emitting diodes 16 is split by the corresponding beam splitter 12 and is combined with the laser generated by the monochromatic narrow-band laser 11 reflected by the second reflecting mirror 19 to generate an initial light beam, and the light beams generated by the N monochromatic narrow-band light-emitting diodes 16 comprise a blue light beam, a green light beam and a red light beam; the first and

second superlenses

In the embodiment of the present invention, in the N monochromatic narrow-band leds 16 included in the light source module 1, N-1 monochromatic narrow-band leds 16 respectively correspond to N-1 beam splitters 12 one to one, and one remaining monochromatic narrow-band led 16 may correspond to the second reflecting mirror 19. As shown in fig. 15, when N is equal to 3, that is, the light source module 1 includes 3 monochromatic narrow-band light-emitting diodes 16, wherein the light beam emitted by one monochromatic narrow-band light-emitting diode 16 can be directed to the second reflecting mirror 19 corresponding thereto, and the light beams emitted by the other two monochromatic narrow-band light-emitting diodes 16 can be directed to the dichroic mirrors 12 corresponding thereto, respectively, and the dichroic mirrors 12 can be dichroic mirrors according to requirements; the beam split by the beam splitter 12 can be combined with the beam reflected by the second reflecting mirror 19 to be an initial beam.

Optionally, referring to fig. 10 to 15, the light source module 1 further includes: a beam expander 18; the beam expander 18 is used to expand the primary beam.

The embodiment of the utility model provides an among the nearly eye display system of holographic formula, no matter be monochromatic or polychrome, all can include beam amplifier 18 in its light source module 1, set up in this light source module 1's last position (like the position that light source module 1 is closest to its light-emitting side) for expand the initial beam, obtain the initial beam that is more applicable to this nearly eye display system of holographic formula, be favorable to generating clearer three-dimensional stereoscopic image.

Example 1

The embodiment of the present application provides a holographic near-eye display system as shown in fig. 16, the specific parameters are shown in table 1, and the parameters in table 1 are respectively substituted into the viewing angle formula

And is provided with

The calculation shows that the full field angle of the system is 107 degrees, and the immersive near-eye projection requirement that the full field angle is larger than 90 degrees is met. Wherein, the ratio of the central wavelength to the bandwidth-to-central wavelength is 480nm (2%): the wavelength of the initial beam is in the range 470.4nm-489.6nm.

TABLE 1

Example 2

The embodiment of the present application provides a holographic near-to-eye display system as shown in fig. 17, the specific parameters are shown in table 2, and the parameters in table 2 are respectively substituted into the viewing angle formula

And is provided with

The calculation shows that the full field angle of the system is 107 degrees, and the immersive near-eye projection requirement that the full field angle is larger than 90 degrees is met. Wherein the ratio of the center wavelength to the bandwidth to the center wavelength is 480nm (2%) as follows: the wavelength of the primary beam is in the range 470.4nm-489.6nm.

TABLE 2

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the technical solutions of the changes or replacements within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A holographic near-eye display system, comprising: the system comprises a light source module (1), a spatial light modulator (2), a first super lens (3), a second super lens (4) and a projection lens (5); the light source module (1) is used for emitting an initial light beam; the spatial light modulator (2) is arranged on the light emitting side of the light source module (1) and is used for performing wavefront modulation on the initial light beam to generate an imaging light beam;

the first super lens (3) is arranged on the light-emitting side of the spatial light modulator (2), and the spatial light modulator (2) is positioned on the object focal plane of the first super lens (3);

the second super lens (4) is arranged on the light emitting side of the first super lens (3), and the image space focal point of the first super lens (3) is superposed with the object space focal point of the second super lens (4); the focal length of the first superlens (3) is larger than that of the second superlens (4);

the projection lens (5) is arranged on the light emergent side of the second superlens (4); the imaging light beam sequentially passes through the first super lens (3) and the second super lens (4), and a real image is generated at the entrance pupil of the projection lens (5); the projection lens (5) is used for converging the real image.

2. The holographic near-eye display system of claim 1, further comprising: a diaphragm (6) arranged coaxially with the first superlens (3) and the second superlens (4); the diaphragm (6) is positioned on the image side focal plane of the first super lens (3) and the object side focal plane of the second super lens (4);

the diaphragm (6) is used for enabling the imaging light beam emitted out of the first super lens (3) to be modulated into a chief ray angle smaller than 8 degrees through the diaphragm (6) and to emit to the second super lens (4), and the diaphragm (6) is used for enabling the imaging light beam emitted out of the second super lens (4) to have a chief ray angle smaller than 8 degrees in an image space of the second super lens (4).

3. The holographic near-eye display system of claim 1, further comprising: a spacer layer (7); the spacing layer (7) is arranged between the first superlens (3) and the second superlens (4) and is used for packaging the first superlens (3) and the second superlens (4) into an integral structure.

4. The holographic near-eye display system of claim 1, further comprising: a first mirror (8); the first reflector (8) is arranged at the intersection point of the main optical axis of the first super lens (3) and the main optical axis of the second super lens (4), and the first reflector (8) is inclined to the main optical axis of the first super lens (3);

the first reflector (8) is used for deflecting the optical path of the imaging light beam which is emitted out of the first super lens (3) and enabling the imaging light beam to be emitted into the second super lens (4).

5. Holographic near-eye display system according to any of claims 1-4, wherein the first superlens (3) comprises: a first substrate (31) and first nanostructures (32) arranged on one side of the first substrate (31); the second superlens (4) includes: a second substrate (41) and second nanostructures (42) arranged on one side of the second substrate (41);

one side of the first substrate (31) includes: the light entrance side or the light exit side of the first substrate (31); one side of the second substrate (41) includes: the light incident side or the light emergent side of the second substrate (41).

6. Holographic near-eye display system according to claim 1, wherein the light source module (1) comprises: a narrow band laser or narrow band light emitting diode capable of emitting a beam of one color; the first and second superlenses (3, 4) include a superlens for removing monochromatic aberration.

7. Holographic near-eye display system of claim 1, wherein the light source module (1) comprises: n monochromatic narrow-band lasers (11) with different central wavelengths and N-1 spectroscopes (12); n is greater than or equal to 3;

after being split by a corresponding beam splitter (12), the laser generated by N-1 monochromatic narrow-band lasers (11) is combined with the laser generated by one monochromatic narrow-band laser (11) which is not split by the beam splitter (12) to generate the initial light beam, and the light beams generated by N monochromatic narrow-band lasers (11) comprise a blue light beam, a green light beam and a red light beam;

the first superlens (3) and the second superlens (4) comprise discrete wavelength chromatic aberration correcting superlenses.

8. Holographic near-eye display system of claim 1, wherein the light source module (1) comprises: n monochromatic narrow-band lasers (11) with different center wavelengths, a second reflecting mirror (19) and N-1 beam splitters (12); n is greater than or equal to 3;

n-1 laser beams generated by the monochromatic narrow-band lasers (11) are split by the corresponding beam splitter (12) and combined with the laser beam generated by the monochromatic narrow-band laser (11) reflected by the second reflecting mirror (19) to generate the initial light beam, and the light beams generated by the N monochromatic narrow-band lasers (11) comprise a blue light beam, a green light beam and a red light beam;

9. Holographic near-eye display system according to claim 1, wherein the light source module (1) comprises: two blue lasers (13), a fluorescent material turntable (14) and two spectroscopes (12);

one said blue laser (13) for producing a blue light beam; another blue laser (13) for illuminating the fluorescent material carousel (14) to excite two light beams having a wavelength greater than that of the blue light beam;

the blue light beam and the two light beams with the wavelength larger than that of the blue light beam are split by the beam splitter (12) to generate the initial light beam;

10. Holographic near-eye display system of claim 1, wherein the light source module (1) comprises: n monochromatic narrow-band light-emitting diodes (16) and N-1 beam splitters (12); n is greater than or equal to 3;

the light beams generated by N-1 monochromatic narrow-band light-emitting diodes (16) are split by the beam splitter (12) and combined with the light beam generated by one monochromatic narrow-band light-emitting diode (16) which is not split by the beam splitter (12) to generate the initial light beam, and the light beams generated by N monochromatic narrow-band light-emitting diodes (16) comprise a blue light beam, a green light beam and a red light beam;

11. Holographic near-eye display system according to claim 1, wherein the light source module (1) comprises: n monochromatic narrow-band light-emitting diodes (16) with different central wavelengths, a second reflecting mirror (19) and N-1 beam splitters (12); n is greater than or equal to 3;

after being split by the corresponding beam splitter (12), the laser light generated by N-1 monochromatic narrow-band light-emitting diodes (16) is combined with the laser light generated by one monochromatic narrow-band light-emitting diode (16) reflected by the second reflecting mirror (19) to generate the initial light beam, and the light beams generated by N monochromatic narrow-band light-emitting diodes (16) comprise a blue light beam, a green light beam and a red light beam;

12. Holographic near-to-eye display system according to any of claims 7-11, wherein the beam splitter (12) comprises a dichroic mirror.

13. Holographic near-eye display system according to any of claims 6-11, wherein the light source module (1) further comprises: a beam expander (18); the beam expander (18) is used for expanding the initial beam.

14. Holographic near-eye display system according to claim 1, characterized in that the spatial light modulator (2) comprises: a transmissive spatial light modulator or a reflective spatial light modulator.

15. Holographic near-to-eye display system according to claim 1, characterized in that the projection lens (5) comprises: an achromatic superlens.