AR light machine and near-to-eye display equipment

Abstract

The invention discloses an AR light machine and a near-to-eye display device, and relates to the technical field of AR optics. The illumination light path comprises a collimating lens, a compound eye, a first lens and a diffusion sheet which are tightly arranged in sequence along a light beam emitted by the light source; the imaging light path comprises a balsaming lens group, a polarization splitting prism, a reflector and a second lens in contact with the light-emitting surface of the polarization splitting prism, wherein the balsaming lens group, the polarization splitting prism and the reflector are tightly arranged in sequence in the direction of the light beam reflected by the LCOS. The lenses are tightly arranged, and in the illumination light path, light beams passing through the diffusion sheet sequentially enter a polarization splitting prism and a bonding lens group in the imaging light path, so that multiplexing of the polarization splitting prism and the bonding lens group is realized; in addition, in the imaging light path, through a folding structure of a polarization splitting prism, the size of the AR light machine is reduced; in addition, the LCOS is small in size. In conclusion, the volume of the AR light machine provided by the invention can be 30% of that of a traditional AR light machine, and miniaturization of the AR light machine is realized.

Description

Technical Field

[0001] This invention relates to the field of AR optical technology, and in particular to an AR optical engine and near-eye display device. Background Technology

[0002] Head-mounted displays for augmented reality use near-eye display technology, allowing people to view virtual images projected onto the real world they perceive while looking at their surroundings. This creates a more realistic experience and enhances user immersion.

[0003] In optical waveguide technology, an optical engine, or optical mechanism, is needed as the image generation unit. Generally, optical waveguides can currently be made thinner and lighter, with shapes approaching the size and shape of eyeglass lenses. However, for optical mechanisms, only microLED solutions can achieve a volume of less than 0.2cc in small to medium field of view. While mLED has lower resolution and cannot yet achieve mature, stable, and low-cost mass production, other solutions have optical mechanisms larger than 1cc, especially those with a field of view (FOV) of 50 degrees or more. As the field of view increases, the volume reaches 1.5cc or even 2cc or more, making the optical mechanism relatively large.

[0004] Therefore, how to further reduce the size of the optical engine while ensuring its performance is a technical problem that urgently needs to be solved by those in the field. Summary of the Invention

[0005] The purpose of this invention is to provide an AR optical engine and a near-eye display device to solve the technical problem of the relatively large size of the optical engine.

[0006] To address the aforementioned technical problems, this invention provides an AR optical engine, comprising: an illumination optical path and an imaging optical path; the illumination optical path includes a collimating lens, a compound eye, a first lens, and a diffuser arranged sequentially and closely along the beam emitted from the light source; the imaging optical path includes a cemented lens group, a polarizing beam splitter, and a reflecting mirror arranged sequentially and closely along the direction of the beam reflected by the LCOS, and a second lens in contact with the light-emitting surface of the polarizing beam splitter; a waveplate-like optical film is disposed between the polarizing beam splitter and the reflecting mirror;

[0007] The light beam emitted by the light source passes sequentially through the collimating lens, compound eye, first lens and diffuser, and then is transmitted to the polarizing beam splitter.

[0008] After being reflected by the beam-splitting surface of the polarizing beam-splitting prism, the light is transmitted to the LCOS through the cemented lens group;

[0009] The LCOS modulates the received beam and reflects it to the cemented lens group. After passing through the cemented lens group, the beam is transmitted to the reflecting mirror through the beam-splitting surface of the polarizing beam splitter.

[0010] The light beam is transmitted to the waveplate-type optical film after passing through the reflector, and the polarization state is changed by the waveplate-type optical film; the polarized light beam is reflected by the beam-splitting surface of the polarizing beam splitter and then exits through the second lens.

[0011] For example, the collimating lens is a plastic aspherical surface, at least one of the two surfaces of the collimating lens is a convex surface, and the focal length of the collimating lens is in the range of 1.8mm to 2.5mm;

[0012] The maximum tilt angle of the surface with the greatest curvature in the two surfaces of the collimating lens is between 50° and 60°.

[0013] The collimating lens aperture satisfies the following conditions: at 50% radial radius, the intensity is 80%~120% of the central intensity, and at 100% radius, the intensity is 20%~30% of the central intensity.

[0014] For example, the compound eye is a double-sided microstructure that is symmetrically distributed; wherein the microstructure is rectangular with a radius of curvature of <1mm; the microstructure surface is spherical, the convex surface sag ratio is less than R / 3, R is the radius of the microstructure surface, and the number of horizontal and vertical arrangements is >8.

[0015] For example, the first lens is a glass spherical surface, at least one of the two surfaces of the first lens is a convex surface, and the curvature of the surface facing the compound eye is the largest, with a focal length range of 7mm to 9mm;

[0016] The diffuser is integrated into the first lens, and the side of the first lens facing away from the compound eye is a microstructure with a roughness requirement between 0.85 and 1.8.

[0017] For example, one side of the diffuser sheet is a smooth plane, and the other side has a random non-periodic structure;

[0018] The input and output beams passing through the diffuser meet the following optical requirements:

[0019] The effective angle output is the result of adding the square of the light source angle and the square of the diffusion angle, and then taking the square root of the sum.

[0020] For example, the reflector is a glass spherical surface; one side of the reflector is a flat surface, the other side is a convex surface, and the focal length is 6mm~8mm.

[0021] For example, the second lens is a glass spherical surface, at least one of the two surfaces of the second lens is a convex surface, and the focal length is 70mm~90mm.

[0022] For example, the cemented lens group is composed of an aspherical lens and a spherical lens cemented together, and the focal length of the cemented lens group is in the range of 8mm to 10mm; the LCOS modulates the received light beam and reflects it into the cemented lens group, and after passing through the spherical lens and the aspherical lens in the cemented lens group in sequence, it is transmitted to the reflecting mirror by the beam splitting surface of the polarizing beam splitter.

[0023] The refractive index of both the spherical lens and the aspherical lens is greater than 1.7, and the Abbe number difference is between 20 and 40.

[0024] At least one of the two surfaces of the aspherical lens is convex, and at least one of the two surfaces of the spherical lens is concave; the cemented surface between the aspherical lens and the spherical lens is spherical.

[0025] To address the aforementioned technical problems, the present invention also provides a near-eye display device, including an optical waveguide structure and an AR optical engine as described above.

[0026] For example, the exit pupil diameter of the AR optical engine is larger than the equivalent coupling entrance diameter in the coupling direction of the optical waveguide structure.

[0027] The AR optical engine provided by this invention includes an illumination optical path comprising a collimating lens, a compound eye, a first lens, and a diffuser arranged sequentially and closely along the beam emitted from the light source; and an imaging optical path comprising a cemented lens group, a polarizing beam splitter, a reflecting mirror, and a second lens in contact with the light-emitting surface of the polarizing beam splitter, arranged sequentially and closely along the direction of the beam reflected by the LCOS. The lenses are arranged closely together, and in the illumination optical path, the beam after passing through the diffuser sequentially enters the polarizing beam splitter and the cemented lens group in the imaging optical path, achieving multiplexing of the polarizing beam splitter and the cemented lens group. Furthermore, in the imaging optical path, the beam undergoes one transmission and one reflection through the polarizing beam splitter, i.e., through the folded structure of the polarizing beam splitter, reducing the size of the AR optical engine. Moreover, compared to digital micromirror devices (DMDs), the LCOS in the AR optical engine provided by this invention has the advantages of smaller size, more mature technology, and lower cost. In summary, the size of the AR optical engine provided by this invention can be reduced by up to 30% compared to the size of traditional AR optical engines, thus achieving miniaturization of AR optical engines.

[0028] In addition, the present invention also provides a near-eye display device, including the above-mentioned AR optical engine, which has the same or corresponding technical features as the AR optical engine mentioned above, and has the same effect. Attached Figure Description

[0029] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A schematic diagram of an AR optical engine provided in an embodiment of the present invention;

[0031] Figure 2 A schematic diagram of a compound eye structure provided in an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of a first lens microstructure provided in an embodiment of the present invention;

[0033] Figure 4 A schematic diagram of the MTF curve provided for the implementation of this invention;

[0034] Figure 5 A schematic diagram of optical distortion provided for an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of pupil distribution provided in an embodiment of the present invention.

[0036] The attached figures are labeled as follows:

[0037] 1-Light source; 2-Collating lens; 3-Compound eye; 4-First lens; 5-Diffuser; 6-Polarizing film; 7-Polarizing beam splitter; 8-Cemented lens group; 9-LCOS; 10-Reflecting mirror; 11-Second lens. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present invention.

[0039] The core of this invention is to provide an AR optical engine and a near-eye display device to solve the technical problem of the relatively large size of the optical engine.

[0040] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Figure 1 This is a schematic diagram of an AR optical engine provided in an embodiment of the present invention, as shown below. Figure 1As shown, the AR optical engine includes an illumination optical path and an imaging optical path. The illumination optical path includes a collimating lens 2, a compound eye 3, a first lens 4, and a diffuser 5 arranged sequentially and closely along the beam emitted from the light source 1. The imaging optical path includes a cemented lens group 8, a polarizing beam splitter 7, a reflecting mirror 10, and a second lens 11 in contact with the light-emitting surface of the polarizing beam splitter 7, arranged sequentially and closely along the beam direction reflected by the LCOS 9. A waveplate-type optical film is disposed between the polarizing beam splitter 7 and the reflecting mirror 10. The waveplate-type optical film may be a quarter-wave plate (QWP) film. In addition, a polarizing film 6 (Polarizer, POL) may be disposed between the diffuser 5 and the polarizing beam splitter 7.

[0041] The light beam emitted by the light source 1 passes sequentially through the collimating lens 2, the compound eye 3, the first lens 4, and the diffuser 5 before being transmitted to the polarizing beam splitter 7.

[0042] After being reflected by the beam-splitting surface of the polarizing beam splitter 7, the light is transmitted to the LCOS 9 through the cemented lens group 8;

[0043] The LCOS 9 modulates the received beam and reflects it to the cemented lens group 8. After passing through the cemented lens group 8, the beam is transmitted to the reflector 10 through the beam splitting surface of the polarizing beam splitter 7.

[0044] After passing through the reflector 10, the light beam is transmitted to the waveplate optical film, and the polarization state is changed by the waveplate optical film. After being reflected by the beam splitting surface of the polarizing beam splitter 7, the polarized light beam is emitted by the second lens 11.

[0045] The choice of light source 1 is not limited. To ensure uniform color mixing, light source 1 can be an RGGB light source, consisting of one red LED, two green LEDs, and one blue LED. The two green LEDs are placed diagonally, as are the red and blue LEDs. Collimating lens 2 is used to collimate the Lambertian radiation beam emitted from light source 1.

[0046] In some possible implementations, the collimating lens 2 is a plastic aspherical surface, at least one of the two surfaces of the collimating lens 2 is a convex surface, and the focal length of the collimating lens 2 is in the range of 1.8mm to 2.5mm;

[0047] The formula for even-order aspherical surfaces is as follows:

[0048] ;

[0049] in, Let be the elevation coordinates. The conic coefficient, For curvature, Radial coordinates, to The aspherical coefficients to be optimized; the maximum tilt angle of the surface with the maximum curvature in the two surfaces of collimating lens 2 is between 50° and 60°;

[0050] To ensure the non-uniformity of the exit pupil of the entire optomechanical system, the aperture of the collimating lens 2 must meet the following condition (i.e., satisfy the edge field vignetting as described below): the cross-sectional curve of its light-emitting surface is an illumination curve with intensity gradually decreasing from the center to the edge, the intensity is 80%~120% of the center intensity at 50% radial radius, and the intensity is 20%~30% of the center intensity at 100% radius.

[0051] The compound eye 3 subdivides the collimated beam. In some possible embodiments, the compound eye 3 is a double-sided microstructure that is symmetrically distributed; wherein the microstructure is rectangular with a radius of curvature <1mm; the surface of the microstructure is spherical, the convex surface truncation ratio is less than R / 3, where R is the radius of curvature of the microstructure surface, and the number of horizontal and vertical arrangements is >8.

[0052] Figure 2 This is a schematic diagram of a compound eye structure provided in an embodiment of the present invention. Figure 2 Figure (a) shows the front view of the compound eye structure, and Figure (b) shows the side view of the compound eye structure. The compound eye 3 is described in terms of structural dimensions, array arrangement, and processing requirements.

[0053] Overall dimensions: The length dimension is mm, of which the effective area length is 4.08±0.01 mm; the width dimension is mm, effective area width 4.32±0.01mm, four corners are 4×R0.5mm rounded corners.

[0054] Array arrangement: The microlens array has two spacings: one with a spacing of 0.240±0.005mm and 17 columns evenly arranged; the other with a spacing of 0.188±0.005mm and 23 rows evenly arranged.

[0055] Thickness and local structure: The medium-thick area is 0.55±0.01mm, the top dimension is 0.422±0.02mm, the two sides have rounded corners of R0.214mm, and there are two marking structures, S1 and S2, and 23 rows are evenly arranged.

[0056] Machining and precision requirements: gate length less than 1.5mm, gate protrusion height less than 0.40mm; multiple markings indicate ⊥0.01E and ∥0.01E form and position tolerance requirements to ensure the flatness and perpendicularity accuracy of the components.

[0057] In some possible implementations, the first lens 4 is a glass spherical surface, at least one of the two surfaces of the first lens 4 is a convex surface, and the curvature of the surface facing the compound eye 3 is the largest, with a focal length range of 7mm to 9mm.

[0058] The diffuser 5 is integrated into the first lens 4. The side of the first lens 4 facing away from the compound eye 3 is a microstructure with a roughness requirement between 0.85 and 1.8.

[0059] That is, the first lens 4 is a glass spherical surface and has the function of a diffuser 5. Figure 3 This is a schematic diagram of a first lens microstructure provided in an embodiment of the present invention. The microstructure is as follows: Figure 3 The random non-periodic structure in it.

[0060] Alternatively, if the first lens 4 does not have a diffusion film, it can be split into the first lens 4 and a diffuser 5 (made of plastic). The diffuser 5 has an infinity focal length and must be placed between the first lens 4 and the polarizing beam splitter 7 (such as a polarizing beam splitter (PBS) film). One side of the diffuser 5 is a smooth plane, and the other side has a random, non-periodic structure.

[0061] The input and output beams after passing through diffuser 5 meet the following optical requirements (i.e., optical properties):

[0062] The effective angle output is the result of adding the square of the light source angle 1 and the square of the diffusion angle, and then taking the square root of the sum.

[0063] The input and output beams of the diffuser 5 satisfy the following expressions:

[0064] ;

[0065] Where C represents the effective angle output, A represents the light source angle, and B represents the diffusion angle.

[0066] The currently selectable diffusion angle (Light Spread / Divergence Angle, LSD) is 10°~15°.

[0067] In some possible implementations, the reflector 10 is a glass spherical surface; one side of the reflector 10 is a flat surface, the other side is a convex surface, and the focal length is 6mm~8mm.

[0068] The second lens 11 is a glass spherical surface, and at least one of the two surfaces of the second lens 11 is a convex surface, with a focal length of 70mm~90mm.

[0069] The cemented lens group 8 is composed of aspherical and spherical lenses cemented together, and the focal length of the cemented lens group 8 is 8mm~10mm. The LCOS 9 modulates the received light beam and reflects it into the cemented lens group 8. After passing through the spherical and aspherical lenses in the cemented lens group 8 in sequence, the light beam is transmitted to the reflector 10 by the beam splitting surface of the polarizing beam splitter 7.

[0070] The refractive index of spherical lenses and aspherical lenses are both greater than 1.7, and the Abbe number difference is between 20 and 40.

[0071] At least one of the two surfaces of an aspherical lens is convex, and at least one of the two surfaces of a spherical lens is concave; the cemented surface between two aspherical lenses is spherical. Having the other surface of an aspherical lens as an aspherical surface can significantly reduce optical mechanism distortion; cemented doublets with positive and negative optical powers can significantly reduce system chromatic aberration, while optimizing the uncemented surface of the positive lens to be aspherical can reduce traditional distortion values ​​by 30-50%.

[0072] The entire solution supports a field of view of 50°~60°. The AR optical engine provided in this embodiment includes a collimating lens 2, a compound eye 3, a first lens 4, and a diffuser 5 arranged sequentially and closely along the beam emitted from the light source 1 in the illumination optical path; and a cemented lens group 8, a polarizing beam splitter 7, a reflecting mirror 10, and a second lens 11 in contact with the light-emitting surface of the polarizing beam splitter 7, arranged sequentially and closely along the beam direction reflected by the LCOS 9. The lenses are arranged closely together. Furthermore, in the illumination optical path, the beam after passing through the diffuser 5 sequentially enters the polarizing beam splitter 7 and the cemented lens group 8 in the imaging optical path, achieving multiplexing of the polarizing beam splitter 7 and the cemented lens group 8. In addition, in the imaging optical path, the beam undergoes one transmission and one reflection through the polarizing beam splitter 7, i.e., the folded structure of the polarizing beam splitter 7 reduces the size of the AR optical engine. Moreover, compared to DMD, the LCOS 9 in the AR optical engine provided by this invention has the advantages of smaller size, more mature technology, and lower cost. In summary, the AR optical engine provided by this invention, based on a variable LCOS 9 size optical architecture, achieves miniaturization by compacting the size of the illumination optical path and folding the size of the imaging optical path. Compared with traditional AR optical engines, the size can be reduced by up to 30%, thus realizing the miniaturization of AR optical engines.

[0073] For a 0.24 LCOS 9 optical engine design with an exit pupil of 4mm and a field of view of 50 degrees, the scheme described above can achieve a drainage volume of 0.8cc and a pure light efficiency of over 33% (considering a 50% POL loss). The imaging performance is described below. Figure 4 A schematic diagram of the MTF curve provided for the implementation of this invention, by Figure 4 It can be seen that, . Figure 5 This is a schematic diagram of optical distortion provided in an embodiment of the present invention. Figure 5 It can be seen that the optical distortion is less than 1.5%.

[0074] The above describes an AR optical engine. This embodiment also provides a near-eye display device, including an optical waveguide structure and the aforementioned AR optical engine.

[0075] The AR optical engine is divided into an illumination section and an imaging section. Its main function is to collimate the image beam emitted from the image source into collimated light with different field of view angles and guide it into the optical waveguide from the waveguide coupling entrance. The AR optical engine scheme described above uses an LCOS 9 polarized image source, and the optical engine system adopts a PBS folded architecture. The illumination section includes a collimating lens 2, a compound eye 3, a first lens 4, and a diffuser 5. The imaging section includes a second lens 11, a polarizing beam splitter 7, a reflector 10, and a cemented lens group 8, as described above. Figure 1 As shown.

[0076] Among them, the collimating lens 2 collimates the Lambertian beam emitted by the light source 1; the compound eye 3 splits the collimated beam into smaller beams; the first lens 4 and the cemented lens group 8 form a relay system to integrate the unit output beam of the compound eye 3 to form a uniform light spot; the polarizing beam splitter 7, the second lens 11 and the cemented lens group 8 form an imaging system to clearly magnify the display image of the LCOS 9 and enter it into the optical waveguide.

[0077] In some possible implementations, the exit pupil diameter of the AR optical engine is larger than the equivalent coupling entrance diameter in the coupling direction of the optical waveguide structure.

[0078] According to the design requirements, the location at the waveguide pupil distance should be an array of replicating optical-mechanical exit pupils, which constitutes the eyebox region. Since the waveguide coupling entrance is a rectangular area (determined by the waveguide properties), and the optical-mechanical exit pupil is circular with a diameter larger than the equivalent coupling entrance diameter in the waveguide's Y direction, the mesh pattern caused by the overlapping pupil effect of the waveguide's bends and splitting surfaces is greatly reduced when used with the arrayed waveguide. Specifically, the circular optical-mechanical exit pupil, after passing through the rectangular waveguide coupling entrance, will overlap to form a mesh pattern as shown in the image. Figure 6 The pupil distribution shown Figure 6 This is a schematic diagram of a pupil distribution provided in an embodiment of the present invention. When the pupils are superimposed, the superposition of multiple troughs of the light intensity curve approximately approximates the center intensity of the unsuperimposed or poorly superimposed areas, making the light intensity distribution more uniform across the entire pupil superposition plane.

[0079] The near-eye display device provided in this embodiment includes an optical waveguide structure and the aforementioned AR optical engine. The embodiments of the AR optical engine have been described in detail above; therefore, the embodiments of the near-eye display device will not be repeated here, and the effects are the same.

[0080] The foregoing has provided a detailed description of an AR optical engine and a near-eye display device provided by the present invention. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the present invention.

[0081] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. An AR light machine, characterized by, The application relates to a light source and an imaging device. The light source comprises an illumination light path and an imaging light path; the illumination light path comprises, in sequence along a light beam emitted by a light source, a collimating lens, an ommatidium, a first lens and a diffusion sheet; the imaging light path comprises, in sequence along a light beam reflected by an LCOS, a cemented lens group, a polarization beam splitting prism, a mirror and a second lens in contact with an exit surface of the polarization beam splitting prism; a wave plate type optical film is arranged between the polarization beam splitting prism and the mirror; The light beam emitted by the light source is transmitted to the polarization beam splitting prism after passing through the collimating lens, the ommatidium, the first lens and the diffusion sheet in sequence; The light beam is transmitted to the LCOS through the cemented lens group after being reflected by a splitting surface of the polarization beam splitting prism; The LCOS modulates the received light beam and reflects the light beam to the cemented lens group; the light beam is transmitted to the mirror through the cemented lens group and is transmitted to the mirror through the splitting surface of the polarization beam splitting prism after the polarization state of the light beam is changed by the wave plate type optical film; and the light beam is emitted by the second lens after being reflected by the splitting surface of the polarization beam splitting prism. The collimating lens is a plastic aspheric surface, at least one of the two surfaces of the collimating lens is a convex surface, and the focal length of the collimating lens ranges from 1.8 mm to 2.5 mm; 2. The AR light engine of claim 1, wherein, The maximum inclination of the maximum curvature surface of the two surfaces of the collimating lens ranges from 50 DEG to 60 DEG; The aperture of the collimating lens satisfies the condition that the intensity at 50% of the radial radius is 80% to 120% of the central intensity, and the intensity at 100% of the radial radius is 20% to 30% of the central intensity. The ommatidium is a double-sided microstructure and is symmetrically distributed; the microstructure is rectangular, the curvature radius is less than 1 mm, the microstructure surface is spherical, the height of the convex surface is less than R / 3, R is the microstructure curvature radius, and the number of the horizontal and vertical arrangements is greater than 8.

3. The AR light engine of claim 1, wherein, The first lens is a glass spherical surface, at least one of the two surfaces of the first lens is a convex surface, the curvature of the surface facing the ommatidium is the largest, and the focal length ranges from 7 mm to 9 mm; 4. The AR light engine of any one of claims 1 to 3, wherein, The diffusion sheet is integrated in the first lens, one surface of the first lens away from the ommatidium is a microstructure, and the roughness ranges from 0.85 to 1.

8. One surface of the diffusion sheet is a smooth plane, and the other surface has a random aperiodic structure; 5. The AR light engine of any one of claims 1 to 3, wherein, The input light beam and the output light beam of the diffusion sheet meet the following optical requirements: The effective angle output is the square root of the sum of the square of the light source angle and the square of the diffusion angle. The mirror is a glass spherical surface; one surface of the mirror is a plane, and the other surface is a convex surface, and the focal length ranges from 6 mm to 8 mm.

6. The AR light engine of any one of claims 1 to 3, wherein, The second lens is a glass spherical surface, at least one of the two surfaces of the second lens is a convex surface, and the focal length ranges from 70 mm to 90 mm.

7. The AR light engine of any one of claims 1 to 3, wherein, ​ 8. The AR light engine of any one of claims 1 to 3, wherein, The cemented lens group is cemented by an aspherical lens and a spherical lens, a focal length range of the cemented lens group is 8mm-10mm; LCOS modulates the received light beam and reflects to the cemented lens group, in turn, through the spherical lens and the aspherical lens in the cemented lens group, and is transmitted to the mirror by the light splitting surface of the polarization light splitting prism; The refractive index of the spherical lens and the refractive index of the aspherical lens are both greater than 1.7, and the Abbe number difference is between 20-40; At least one of the two surfaces of the aspherical lens is a convex surface, at least one of the two surfaces of the spherical lens is a concave surface, and the cemented surface between the aspherical lens and the spherical lens is a spherical surface.

9. A near-eye display device, comprising: The AR light machine comprises an optical waveguide structure and an AR light machine as claimed in any one of claims 1 to 8.

10. The near-eye display device of claim 9, wherein, The exit pupil diameter of the AR light machine is greater than the equivalent coupling entrance diameter of the coupling-out direction of the optical waveguide structure.

Images