CN113655616A

CN113655616A - Reflective spectral imaging system for near-eye display

Info

Publication number: CN113655616A
Application number: CN202110612023.8A
Authority: CN
Inventors: 李湘裔
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-06-01
Filing date: 2021-06-01
Publication date: 2021-11-16
Anticipated expiration: 2041-06-01
Also published as: CN113655616B; WO2022252507A1

Abstract

The invention discloses a reflection spectrum imaging system for near-eye display in the technical field of optics, which is formed by combining an image projection unit (100) and an optical lens (200) with a reflection spectrum imaging function, wherein the image projection unit (100) is an image source projection optical system containing monochromatic narrow-band spectral characteristics of red (R)/green (G)/blue (G) and the like, the optical lens (200) is provided with an optical reflection surface type matched with the image projection unit (100) and is plated with an optical film (201) with the narrow-band spectrum reflection imaging function, image light output by the image projection unit (100) can be directly projected to the inner surface of the optical lens (200) and is reflected to the retina of a human eye by the optical film (201) to form an enlarged virtual image in front of the human eye to realize the near-eye display. The optical imaging system has the advantages of good adaptability to human eyes, high imaging quality, high display definition, excellent perspective performance, light and thin miniaturized design and easy realization of industrial mass production.

Description

Reflective spectral imaging system for near-eye display

Technical Field

The invention belongs to the technical field of optics, and particularly relates to a reflection spectrum imaging system for near-eye display.

Background

Since the Ivan Sutherland published in 1965 as "Ultimate Display" (Ultimate Display), Virtual Reality (VR) technology is continuously perfected from concept to theory and is promoting application in the fields of military, aerospace, audio-visual entertainment, education, industrial design, medicine and the like, and the characteristics of existence, multi-perceptibility, interactivity and the like are more and more favored and recognized by people, and the demand of various industries is increasing. With the development and progress of scientific technologies such as computer technology, electronic information technology, simulation technology and the like, the Virtual Reality (VR) technology, the Augmented Reality (AR) technology and the Mixed Reality (MR) technology take advantage of the advantages and the disadvantages to compete with each other for development, the application research in related fields is extremely active and develops rapidly, great progress is achieved, application scenes are increasingly wide, and wide and attractive development prospects are shown.

In the application of Virtual Reality (VR) technology, Augmented Reality (AR) technology and Mixed Reality (MR) technology, image information is imaged through human retina to form virtual images or simulation scenes close to reality in the air, so that the applied near-eye display equipment achieves the good effect of fusion of existence, multi-perceptibility and user interactivity. In order to achieve the best effect of the near-eye display device, many structural forms of near-eye display optical systems and optical lenses have been developed and applied to related products, but the following common problems still exist in the prior art so far: the imaging display system and the lens have complex structures, the vision correction device is not required to be additionally configured due to poor adaptability with human eyes, the light energy utilization efficiency is low, the imaging display quality cannot meet the design requirement, the user experience sense is poor, the processing technology is complex, the large-scale manufacturing difficulty is high, the manufacturing cost is high, and the like, so that the related technology, the large-scale manufacturing and the market popularization of products are blocked, and the rapid popularization and application of the products are difficult.

The early near-eye display imaging optical system and the lens are mainly formed by combining a multi-piece structure, although the structure can realize the effect of near-eye display, the optical lens has relatively complex structure, thicker optical thickness and heavier weight, has poorer adaptability with human eyes, and can generate uncomfortable physiological reactions such as dizziness, nausea and the like after being worn for a long time, so that the optical lens is gradually replaced by a novel structure. In order to solve the above problems and achieve the lightness and thinness of the near-eye display system, people research and develop near-eye display optical systems and lenses with various structural forms, and according to published related patents and information reports, novel near-eye display imaging systems and optical lenses are mainly designed and developed around optical waveguide technologies (including geometric optical waveguides, diffraction optical waveguides, holographic optical waveguides and the like), free-form surface prism technologies, free-form surface micro-nano optical superstructure surface technologies and the like, wherein some patent technologies have been commercialized and put to market applications, and the development progress of the near-eye display technology is promoted, but the above prior art still has various defects so that the requirements of related technology development are difficult to meet. Taking a representative optical waveguide imaging display technology as an example, an optical waveguide lens is considered as a major development direction of a future AR near-eye display technology due to its light and thin shape structure and high light transmittance, such as geometric optical waveguide array of israel Lumus, waveguide assembly and near-eye display device (application number 201910212609.8) of hua-shi technology limited, etc., a diffraction optical waveguide such as optical waveguide patent of HoloLens of Microsoft in the united states (US 9372347), optical waveguide patent published by Magic Leap (US 2018/0052277), etc., are all surface relief grating waveguides based on a photolithography technology and holographic optical waveguides based on a holographic technology, whose technical path mainly surrounds an optical waveguide to deal with optical problems of a near-eye display system, light is coupled in from a circular coupling-in area, then distributed to a fan-shaped extended pupil area, and finally coupled out to human eyes from a square coupling-out area, although the light and thin effects of the near-to-eye display optical system and the optical lens of the optical waveguide structure are good, the following disadvantages exist: the optical energy loss is generated in the process of coupling light into and out of the waveguide and transmitting the light, so that the utilization rate of the optical energy of imaging display is low, the diffraction dispersion effect which is difficult to eliminate exists in the diffraction light waveguide, so that the rainbow phenomenon and the halation are generated on the image, the optical waveguide lens is generally a parallel flat plate structure, the curved lens which is matched with human eyes is difficult to manufacture, the processing technology of the optical waveguide lens is complex, so that the yield is low, the cost is high, and the like; although the near-to-eye display imaging effect of a single lens is realized by adopting the free-form surface prism structure, the near-to-eye display imaging lens has the obvious defects of difficult realization of lightness and thinness, prism dispersion effect, poor adaptability to human eyes and the like; the 28 claims of the novel technology for the free-form surface type micro-nano optical superstructure surface, such as the free-form surface type nano structure surface for virtual and augmented reality near-eye displays (patent application No. 201680028406, publication No. CN107771297B, publication No. 2021.04.06), mainly adopt a combiner, a secondary mirror and a waveguide with a free-form surface type nano structure, and the 28 claims of the novel technology all claim about the nano structure surface, namely, an ultra-grating structure defined by unit cells with a plurality of ultra atoms and different length-width ratios, and essentially utilize the technical principle of a reflective grating, although the nano structure surface can realize the lightness and thinness of a lens, the related processing technology and process are complex, and the ultra grating on the nano structure surface needs to be carefully protected, otherwise, the fine nano structure on the surface is not only easy to be scratched and slightly stained, which affects the imaging display effect, the technical maturity needs a current day.

Disclosure of Invention

In order to solve the defects of the prior art, the invention aims to adopt a near-eye display reflection spectrum imaging system different from the prior art, integrates multiple functions of reflection spectrum imaging, vision correction and good transparency by only using one lens, replaces the function which can be realized by a plurality of or multilayer glued structures or other complex surface morphological structures in the prior art, and can greatly simplify the structural design in the prior art. The method has the characteristics of good adaptability to human eyes, high imaging quality, high display definition, excellent perspective performance, light and thin miniaturized design, easiness in industrial scale production and relatively low manufacturing cost, can be widely applied to intelligent glasses in application scenes such as Virtual Reality (VR), Augmented Reality (AR), Mixed Reality (MR) and the like and other near-to-eye display equipment and miniaturized projection display equipment, and has practical significance for accelerating development progress and application popularization of related technologies.

In order to achieve the purpose, the invention adopts the technical scheme that: a reflectance spectral imaging system for near-eye display, characterized by: the device is formed by combining an image projection unit (100) and an optical lens (200) with an optical film reflection spectrum imaging function; the imageThe projection unit (100) is red (λ) containing narrow-band spectral features_R±δ_λR) Green (lambda)_G±δ_λG) Blue (lambda)_B±δ_λB) /or more monochromatic yellow (lambda)_Y±δ_λY) The LED, laser, OLED lighting, displaying and imaging optical projection system or the image optical projection system which does not contain the narrow-band spectral characteristics of the monochromatic light source lighting, displaying and imaging but is added with the narrow-band filter method to generate the same effect; the inner surface of the optical lens (200) is provided with an optical surface type matched with the image projection unit (100) and an optical film (201) with a reflection spectrum imaging function, the outer surface of the optical lens is provided with a broadband antireflection optical antireflection film (202) which is matched with the inner surface to form the optical surface type with a vision correction function of diopter of flat light, myopia, hyperopia or astigmatism, and is provided with a broadband antireflection optical antireflection film (202) within a visible light spectrum range, and the optical film (201) has red (lambda) output by the image projection unit (100) within the visible light spectrum range of 400nm-760nm_R±δ_λR) Green (lambda)_G±δ_λG) Blue (lambda)_B±δ_λB) Or more monochromatic colors, e.g. yellow (lambda)_Y±δ_λY) The characteristic spectrum of the light source has high reflection characteristic of the narrow-band spectrum matched with the characteristic spectrum and high transmission characteristic of other spectral wave bands; the optical anti-reflection film (202) can improve the overall light transmittance of the optical lens, effectively eliminate the interference of stray light reflected on the outer surface of the optical lens and improve the imaging quality of near-to-eye display; the image projection unit (100) is arranged on the side surface of the optical lens (200), the output image light can be directly projected to the inner surface of the optical lens (200) to be reflected by the optical film (201) to be imaged on the retina of the human eye, and an enlarged virtual image is formed in front of the human eye to achieve the purpose of near-to-eye display.

Further, the optical lens (200) is made of optical glass or optical plastic transparent materials through grinding and polishing or die pressing and injection molding, and the optical film (201) and the optical anti-reflection film (202) are plated through an optical film plating technology.

Further, when the light output by the image projection unit (100) is polarized light, the optical filmRed (lambda) of film (201)_R±δ_λR) Green (lambda)_G±δ_λG) Blue (lambda)_B±δ_λB) Or more monochromatic colors, e.g. yellow (lambda)_Y±δ_λY) The narrow-band spectral reflection characteristics of the light source are designed according to the corresponding polarization state.

Further, the optical lens (200) is formed by combining the optical film (201) with a material with photochromic and electrochromic functions or a color filter with reduced light transmittance, and the optical lens (200) can improve the contrast and the definition of an imaging display used outdoors or in a strong light environment.

Further, the optical film (201) can be plated on other transparent film base materials and then adhered on the inner surface of the optical lens (200) or glued between two lenses as an interlayer.

Further, the optical film (201) has a film system structure consisting of SUB (substrate)/N_M92nm/N_L64 nm/N _M 50 nm/N_L 20 nm /N_H18 nm / N_L 184 nm / N_H 112 nm/ N_L 42 nm / N_H 19 nm / N_L 30 nm/ N_H139nm/ N_L 38 nm / N_H 106 nm/ N_L 27 nm / N_H 107 nm / N_L 56 nm / N_H 23 nm / N_M 44 nm / N_H 89 nm / N_M 187 nm / N_H 66 nm / N_M 151 nm/ N_H 32 nm / N_M 34 nm/ N_H 86 nm /N_L134 nm / N_M 78 nm/N_H 40 nm / N_M 113 nm / N_L 12 nm / N_M 170 nm / N_L 48 nm / N_M28 nm / N_L 39 nm / N_H 83 nm/ N_L 36 nm/ N_H 112 nm / N_L 22 nm/ N_H 23 nm / N_M 48 nm/ N_H 105 nm / N_M 150 nm/ N_H 81 nm / N_M39 nm/AIR (AIR) composition, wherein N_H 、N_M、N_LHigh, medium and low refractive index dielectric materials with refractive indexes of 2.00-2.55, 1.60-1.85 and 1.35-1.48 respectively, the above materialsThe thickness of each layer of the film structure can be adjusted within + -10%.

The optical antireflection film (202) has a film system structure of SUB (substrate)/N_M22nm/N_L27 nm/N_H 109 nm/N_L86 nm/AIR (AIR) composition, wherein N_H 、N_M、N_LThe dielectric materials with high, medium and low refractive indexes are respectively the refractive indexes of 2.15-2.35, 1.85-2.05 and 1.35-1.46.

Adopt above-mentioned technical scheme's beneficial effect:

the difference between the invention and the prior published patents and reports is that: adopts completely different optical film reflection spectrum imaging systems and near-to-eye display optical lenses, the optical lenses integrate multiple functions of reflection spectrum imaging, vision correction and good transparency, one optical lens replaces the function which can be realized by the prior art needing a plurality of or multilayer gluing structures or other complex surface morphological structures, and has the characteristics of good adaptability to human eyes, no need of additionally arranging a vision correction device, high light efficiency utilization rate, high imaging quality, high display definition, excellent perspective performance, light and thin miniaturized design, easy realization of industrial scale production, relatively low manufacturing cost and the like, the method can be widely applied to intelligent glasses in application scenes such as Virtual Reality (VR), Augmented Reality (AR), Mixed Reality (MR) and the like and other forms of near-to-eye display equipment and miniaturized projection display equipment, and has practical significance for accelerating development progress and application promotion of related technologies.

The uniqueness of the invention is shown in: for example, compared with the optical waveguide technology, the optical film reflection spectrum imaging method is utilized to replace the process that the optical waveguide structure needs to be optically coupled in and out of the waveguide and transmitted, the light energy utilization efficiency is improved, the rainbow phenomenon and the halo generated by the dispersion effect of the optical waveguide can be eliminated, the field angle and the imaging quality of near-to-eye display are expanded, the surface shape of the optical lens is a curved surface suitable for human eyes instead of the planar structure adopted by the optical waveguide, and meanwhile, the vision can be synchronously corrected without additionally adding a vision correction device or other mechanisms; compared with the free-form surface prism technology, the imaging is performed through the primary reflection of the optical film on the surface of the optical lens, and the non-free-form surface prism structure needs multiple reflection imaging in the lens, so that the lens is simpler in shape, thinner in optical thickness, free of prism dispersion effect and larger in imaging display field angle; compared with the free-form surface nanostructure surface super-grating technology, the optical film reflection spectrum imaging technology is adopted instead of the complicated nanometer superstructure surface reflection type grating technology, and the outstanding problems that the reflection type grating is low in diffraction efficiency, complex in surface processing technology, required to be carefully protected to prevent dirt, limited in service life, low in technology maturity and the like are solved.

The optical lens is manufactured by adopting transparent materials such as optical glass or optical plastic and the like through grinding, polishing, mould pressing, injection molding and the like, the optical film and the broadband antireflection optical antireflection film on the surface of the optical lens are plated by adopting an optical film plating technical method such as a physical vapor deposition method, a chemical vapor deposition method and the like, not only are the required raw materials easily obtained, but also relevant process technologies and equipment for large-scale manufacturing have mature industrial schemes, and compared with the disclosed processing technology required by the relevant lenses in the prior art, the optical lens has obvious large-scale production maturity, reliability, high yield and low cost controllability, and can realize rapid application and popularization.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of a spectral curve of an optical film of the present invention;

FIG. 3 is a schematic diagram of a spectral curve of the broadband antireflection optical coating according to the present invention;

FIG. 4 is a schematic diagram of a prior art optical waveguide structure;

FIG. 5 is a schematic diagram of a prior art freeform prism;

fig. 6 is a schematic diagram of a surface technology of a free-form surface nanostructure in the prior art.

Detailed Description

In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easily understood, the invention is further described below with reference to the specific embodiments and the attached drawings, but the following embodiments are only the preferred embodiments of the invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention.

The deficiencies of the prior art are described below in connection with the accompanying drawings.

As shown in fig. 4, in the optical waveguide imaging display scheme of the prior art, light output by the image projection system is optically coupled and transmitted through the laminated film prism or the reflective/transmissive diffraction grating which is glued, and light needs to be reflected for many times in the processes of entering and exiting the waveguide and transmitting to the retina of the human eye, so that not only is the loss of light energy large and the utilization rate of light efficiency low, but also the rainbow phenomenon and halo generated by the inherent dispersion effect are difficult to eliminate, and the adaptability of the parallel flat plate structure to the human eye is poor, so that the practical experience effect of the technical scheme is poor.

In the free-form surface prism structure shown in fig. 5, light output by the image projection system is guided into the retina of human eyes for imaging after being internally reflected in multiple ways through a special morphological structure of the free-form surface prism structure, and the free-form surface prism structure has the defects that the optical thickness of a lens is thick, the thickness is difficult to thin, the field angle of imaging display is limited, the dispersion effect of the prism is difficult to adapt to the physiological structure of human eyes, and the like.

Fig. 6 shows a free-form surface type micro-nano superstructure surface technology, wherein a reflection grating formed by a micro-nano superstructure array on the surface of a lens reflects projected light rays to a retina of a human eye for imaging, the design and manufacture of the free-form surface type nano superstructure grating are relatively complex, the technical maturity is not high, the manufacturing cost is relatively high, the requirements on the use environment and the use method are strict due to the need of very careful protection in use, and the practical popularization is limited at the present stage.

Specific embodiments of the present invention are described below with reference to the accompanying drawings.

Fig. 1 shows a reflection spectrum imaging system for near-eye display according to the present invention, which is formed by combining an image projection unit 100 and an optical lens 200 having a reflection spectrum imaging function, wherein the optical lens 200 integrates a plurality of functions of reflection spectrum imaging, vision correction, and good transparency, and the like, one lens replaces the function that the prior art needs a multi-sheet or multi-layer gluing structure or other complex surface morphology structures to realize, light output by the image projection unit 100 is reflected once through the lens surface to be introduced into retina imaging of human eyes, and an amplified virtual image is formed in front of the human eyes to realize the purpose of near-eye display, thereby greatly simplifying the complex structure of the prior art.

The image projection unit 100 is an optical projection system for illumination, display, and imaging, such as an LED, a laser, and an OLED, which includes a narrow-band spectral feature of red (632 nm ± 10 nm)/green (520 nm ± 10 nm)/blue (450 nm ± 10 nm), or an optical projection system for image which does not include a monochromatic light source for illumination, display, and imaging, but is provided with a narrow-band filter to produce the same effect.

The optical lens 200 is made of transparent materials such as optical glass or optical plastic by grinding, polishing, die pressing, injection molding and the like, the surface shape of the inner surface is designed to be matched with the image projection unit 100, the optical lens has a curved surface for reflecting light rays output by the image projection unit 100 to retina imaging of a human eye and is plated with an optical film 201 with a reflection spectrum imaging function, and the outer surface is matched with the first surface to form an optical surface shape with a vision correction function (diopter is flat light, near vision, far vision or astigmatism) and is plated with a broadband antireflection film 202 in a visible light spectrum range.

As shown in fig. 2, the optical film 201 has a narrow-band spectrum high-reflection characteristic matching with the characteristic spectrum of red (632 nm ± 10 nm)/green (520 nm ± 10 nm)/blue (450 nm ± 10 nm) output by the image projection unit 100 in the visible light spectrum range of 400nm-760nm, and has a high-transmission characteristic for the rest of the spectrum bands. When the light output by the image projection unit (100) is S polarized light, P polarized light or other polarized light, the red (lambda) of the optical film (201)_R±δ_λR) Green (lambda)_G±δ_λG) Blue (lambda)_B±δ_λB) Or more monochromatic colors, e.g. yellow (lambda)_Y±δ_λY) The narrow-band spectral reflection characteristics of (a) are designed according to the corresponding S polarization state or P polarization state or other polarization states.

To further illustrate the lightThe structural characteristics and the manufacturing method of the optical film 201 give a concrete implementation case that the optical lens 200 after being grinded, polished or injection molded is conveyed to a magnetron sputtering vacuum coating device, and the structure of the coating system is SUB (substrate)/N after the coating condition is reached_M92nm/N_L64 nm/N _M 50 nm/N_L 20 nm /N_H18 nm / N_L 184 nm / N_H 112 nm/ N_L 42 nm / N_H 19 nm / N_L 30 nm/ N_H 139nm/ N_L 38 nm / N_H 106 nm/ N_L 27 nm / N_H 107 nm / N_L 56 nm / N_H 23 nm / N_M 44 nm / N_H 89 nm / N_M 187 nm / N_H 66 nm / N_M 151 nm/ N_H 32 nm / N_M 34 nm/ N_H 86 nm /N_L134 nm / N_M 78 nm/N_H 40 nm / N_M113 nm / N_L 12 nm / N_M 170 nm / N_L 48 nm / N_M 28 nm / N_L 39 nm / N_H 83 nm/ N_L36 nm/ N_H 112 nm / N_L 22 nm/ N_H 23 nm / N_M 48 nm/ N_H 105 nm / N_M 150 nm/ N_H 81 nm / N_M39 nm/AIR, total thickness of membrane layer 3.177 μm, wherein N_H、N_M、N_LThe schematic diagram of the spectral characteristic curve of the optical film 201 plated by the film system structure is shown in fig. 2, and the high reflectivity in three narrow band spectral bands of red light (622-.

The specific embodiment of the optical anti-reflection film 202 is plated by magnetron sputtering coating method, and the film system structure is SUB (substrate)/N_M22nm/N_L27 nm/N_H 109 nm/N_L86 nm/AIR, total thickness of the film layer is 0.244 mu, wherein N_H 、N_M、N_LThe dielectric materials with high, medium and low refractive indexes are respectively the refractive indexes of 2.15-2.35, 1.85-2.05 and 1.35-1.46. Preferably, N_H、N_M、N_LThe dielectric materials with high, medium and low refractive indexes, with the refractive indexes of sputtered film layer materials being 2.35, 2.05 and 1.46, respectively, realize broadband antireflection effects with the average reflectivity being less than 0.5% and the average transmissivity being more than 99.5% in the visible light spectrum range, effectively reduce the reflection stray light and the overall light transmittance of the outer surface of the optical lens 200 lens, and improve the imaging quality of near-to-eye display. The spectral characteristics are shown in fig. 3.

The optical film can be made of medium materials with high, medium and low refractive indexes, which are more in variety and easy to obtain, for example, the functional optical film formed by TiO2, Al2O3, SiO2 and the like has stronger scratch resistance and better environmental resistance, and can be used for a long service life without special protection;

therefore, the optical lens 200 of the present invention not only has the function of narrow-band spectral reflection imaging, but also has better transparency and vision correction function, and has the function of replacing the prior art that needs a multi-sheet or multi-layer gluing structure or other complex surface morphology structures. The image projection unit 100 is installed on the side of the optical lens 200, and the output image light can be directly projected to the inner surface of the optical lens 200 to be reflected by the optical film 201 to the retina of the human eye for imaging and form an enlarged virtual image in front of the human eye, so as to achieve the purpose of near-to-eye display, as shown in fig. 1.

The foregoing shows that the basic principles, essential features and advantages of the invention are described. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A reflectance spectral imaging system for near-eye display, characterized by: the device is formed by combining an image projection unit (100) and an optical lens (200) with an optical film reflection spectrum imaging function; the image projection unit (100) is red (λ) containing narrow-band spectral features_R±δ_λR) Green (lambda)_G±δ_λG) Blue (lambda)_B±δ_λB) Or more monochromatic colors, e.g. yellow (lambda)_Y±δ_λY) The LED, laser, OLED lighting, displaying and imaging optical projection system or the image optical projection system which does not contain the narrow-band spectral characteristics of the monochromatic light source lighting, displaying and imaging but is added with the narrow-band filter method to generate the same effect; the inner surface of the optical lens (200) is provided with an optical surface type matched with the image projection unit (100) and an optical film (201) with a reflection spectrum imaging function, the outer surface of the optical lens is provided with a broadband antireflection optical antireflection film (202) which is matched with the inner surface to form the optical surface type with a vision correction function of diopter of flat light, myopia, hyperopia or astigmatism, and is provided with a broadband antireflection optical antireflection film (202) within a visible light spectrum range, and the optical film (201) has red (lambda) output by the image projection unit (100) within the visible light spectrum range of 400nm-760nm_R±δ_λR) Green (lambda)_G±δ_λG) Blue (lambda)_B±δ_λB) Or more monochromatic colors, e.g. yellow (lambda)_Y±δ_λY) The characteristic spectrum of the light source has high reflection characteristic of the narrow-band spectrum matched with the characteristic spectrum and high transmission characteristic of other spectral wave bands; the optical anti-reflection film (202) can improve the overall light transmittance of the optical lens, effectively eliminate the interference of stray light reflected on the outer surface of the optical lens and improve the imaging quality of near-to-eye display; the image projection unit (100) is arranged on the side surface of the optical lens (200), the output image light can be directly projected to the inner surface of the optical lens (200) to be reflected by the optical film (201) to be imaged on the retina of the human eye, and an enlarged virtual image is formed in front of the human eye to achieve the purpose of near-to-eye display.

2. The reflectance spectral imaging system for near-eye display according to claim 1, wherein: the optical lens (200) is made of optical glass or optical plastic transparent materials through grinding and polishing or die pressing, injection molding and the like, and the optical film (201) and the optical anti-reflection film (202) are plated through an optical film plating technology.

3. The reflectance spectral imaging system for near-eye display according to claim 1, wherein: when the light output by the image projection unit (100) is polarized light, the red (lambda) of the optical film (201)_R±δ_λR) Green (lambda)_G±δ_λG) Blue (lambda)_B±δ_λB) Or more monochromatic colors, e.g. yellow (lambda)_Y±δ_λY) The narrow-band spectral reflection characteristics of the light source are designed according to the corresponding polarization state.

4. The reflectance spectral imaging system for near-eye display according to claim 1, wherein: the optical lens (200) is formed by combining the optical film (201) with a material with photochromic and electrochromic functions or a color filter with reduced light transmittance, and the optical lens (200) can improve the contrast and the definition of an imaging display used outdoors or in a strong light environment.

5. The reflectance spectral imaging system for near-eye display according to claim 1, wherein: the optical film (201) can be plated on other transparent film base materials and then adhered to the inner surface of the optical lens (200) or glued between two lenses as an interlayer.

6. The reflectance spectral imaging system for near-eye display according to claim 1, wherein: the optical film (201) has a film system structure consisting of SUB (substrate)/N_M92nm/N_L64 nm/N_M 50 nm/N_L 20 nm /N_H18 nm / N_L 184 nm / N_H 112 nm/ N_L 42 nm / N_H 19 nm / N_L 30 nm/ N_H 139nm/ N_L 38 nm / N_H 106 nm/ N_L 27 nm / N_H 107 nm / N_L 56 nm / N_H 23 nm / N_M 44 nm / N_H 89 nm / N_M 187 nm / N_H 66 nm / N_M 151 nm/ N_H 32 nm / N_M 34 nm/ N_H 86 nm /N_L134 nm / N_M 78 nm/N_H 40 nm / N_M 113 nm / N_L 12 nm / N_M 170 nm / N_L 48 nm / N_M 28 nm / N_L 39 nm / N_H 83 nm/ N_L 36 nm/ N_H 112 nm / N_L 22 nm/ N_H 23 nm / N_M 48 nm/ N_H 105 nm / N_M 150 nm/ N_H 81 nm / N_M39 nm/AIR (AIR) composition, wherein N_H 、N_M、N_LThe dielectric materials with high, medium and low refractive indexes of 2.00-2.55, 1.60-1.85 and 1.35-1.48 respectively, and the thickness of each layer of the film system structure can be adjusted within the range of +/-10%.

7. The reflectance spectral imaging system for near-eye display according to claim 1, wherein: the optical antireflection film (202) has a film system structure of SUB (substrate)/N_M22nm/N_L27 nm/N_H 109 nm/N_L86 nm/AIR (AIR) composition, wherein N_H 、N_M、N_LThe dielectric materials with high, medium and low refractive indexes are respectively the refractive indexes of 2.15-2.35, 1.85-2.05 and 1.35-1.46.