Optical display system and AR device with folded optical path

Abstract

The present invention provides an optical display system and AR device with a folded optical path, belonging to the field of optical imaging technology. The optical display system includes a display, a first optical system component and a second optical system component. The first optical system component is arranged on the light-emitting light path of the display. The second optical system component includes a first optical lens and a second optical lens. The first optical lens is arranged on the light-emitting light path of the first optical system component, and the second optical lens is arranged on the reflected light path of the first optical lens. The optical axis of the first optical lens forms an angle β with the light-emitting light path of the first optical system component, which satisfies 20°≤β≤70°; it has a small volume, good imaging quality, and a large field angle range. The AR device can be adapted to people with different degrees of myopia by adjusting the system.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical imaging, and in particular relates to an optical display system and an AR device with a folded optical path. Background Art

[0002] Augmented Reality (AR) is a technology that superimposes the real world and the virtual world by combining optical devices with computer technology. This technology enables users to interact with both the real world and the virtual world at the same time, bringing users a new interactive experience. The penetrating optical display system is one of the core technologies in the field of augmented reality. Currently, wearable devices using augmented display technology have been widely used in games, retail, education, industry, medical and other fields.

[0003] At present, penetrating optical display technology can be divided into geometric optics solutions: Birdbath, ordinary reflective prism, free-form surface prism and other solutions and diffraction optics-based array optical waveguide, diffraction optical waveguide and other solutions. Among them, the idea of ​​geometric optics is more mature than the diffraction solution, with convenient device processing and small assembly tolerance requirements. However, this type of solution is limited by the light source device and the overall size, weight and price requirements of the AR system. There are generally problems that size, price, field of view, performance and observation distance cannot be taken into account, and the displayed content is easy to leak and the confidentiality is poor. For myopic users, additional myopic lenses are required to be used with the optical system. These shortcomings reduce the user experience of augmented reality wearable devices. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide an optical display system with a folded optical path, which has a small size, good imaging quality, and a large field of view angle range.

[0005] Another object of the embodiments of the present invention is to provide an AR device that is easy to wear, can be adapted to myopic users, and enhances user experience and immersion.

[0006] The embodiment of the present invention is achieved as follows:

[0007] An embodiment of the present invention provides an optical display system with a folded optical path, including a display, a first optical system component and a second optical system component, wherein the first optical system component is arranged on the light output path of the display, and the second optical system component includes a first optical lens and a second optical lens, the first optical lens is arranged on the light output path of the first optical system component, and the second optical lens is arranged on the reflected light path of the first optical lens, and the optical axis of the first optical lens forms an angle β with the light output path of the first optical system component, which satisfies 20°≤β≤70°.

[0008] Optionally, the first optical lens includes a first lens, a first polarization absorption film, a first polarization reflection film, a first phase delay film and a first anti-reflection film;

[0009] The first polarizing absorption film is arranged on a side of the first lens close to the first optical system component, the first polarizing reflection film is arranged on a side of the first polarizing absorption film away from the first lens, the first phase delay film is arranged on a side of the first polarizing reflection film away from the first lens, and the number of the first anti-reflection films is two and they are respectively arranged on a side of the first phase delay film away from the first lens and a side of the first lens away from the first polarizing absorption film;

[0010] Alternatively, the first polarizing absorption film is arranged on a side of the first lens away from the first optical system component, the first polarizing reflection film is arranged on a side of the first lens close to the first optical system component, the first phase delay film is arranged on a side of the first polarizing reflection film away from the first lens, and the number of the first anti-reflection films is two and they are respectively arranged on a side of the first phase delay film away from the first lens and a side of the first polarizing absorption film away from the first lens;

[0011] Alternatively, the first phase delay film is arranged on the side of the first lens away from the first optical system component, the first polarizing reflective film is arranged on the side of the first phase delay film away from the first lens, the first polarizing absorption film is arranged on the side of the first polarizing reflective film away from the first lens, and the number of the first anti-reflection films is two and they are respectively arranged on the side of the first polarizing absorption film away from the first lens and the side of the first lens away from the first optical system component.

[0012] Optionally, the second optical lens includes a second lens, a compensation mirror, a second phase delay film, a second linear polarization film, a second partially transmissive and partially reflective film, and a second anti-reflection film;

[0013] The compensation mirror is arranged on a side of the second lens away from the first optical lens, the second phase delay film is arranged on a side of the compensation mirror away from the second lens, the second linear polarization film is arranged on a side of the second phase delay film away from the second lens, the second anti-reflection film is arranged on a side of the second linear polarization film away from the second lens, and the second partially transmissive and partially reflective film is arranged on a side of the second lens away from the compensation mirror;

[0014] Alternatively, the second partially transmissive partially reflective film is arranged on the side of the second lens away from the first optical lens, the compensation mirror is arranged on the side of the second partially transmissive partially reflective film away from the first optical lens, the second phase delay film is arranged on the side of the compensation mirror away from the second lens, the second linear polarizing film is arranged on the side of the second phase delay film away from the second lens, and the second anti-reflection film is arranged on the side of the second linear polarizing film away from the second lens.

[0015] Optionally, the radius of curvature of the surface of the second lens close to the first optical lens is R211, and the radius of curvature of the surface of the second lens away from the first optical lens is R212, which satisfies: 10mm≤|R211|, 10mm≤|R212|.

[0016] Optionally, the first optical system component includes a third optical lens and a fourth optical lens, the third optical lens is arranged on the light output path of the display, the fourth optical lens is arranged on the transmitted light path of the third optical lens, the fourth optical lens is a total reflection lens, and the first optical lens is arranged on the reflected light path of the third optical lens.

[0017] Optionally, the third optical lens includes a third lens, a third polarized reflective film, a third phase delay film and a third anti-reflection film;

[0018] The third polarizing reflective film is arranged on a side of the third lens away from the display, the third phase delay film is arranged on a side of the third polarizing reflective film away from the third lens, and the number of the third anti-reflection films is two and they are arranged on a side of the third lens close to the display and a side of the third phase delay film away from the third lens respectively;

[0019] Alternatively, the third polarizing reflective film is arranged on a side of the third lens close to the display, the third phase delay film is arranged on a side of the third lens away from the display, and the number of the third anti-reflection films is two and they are respectively arranged on a side of the third polarizing reflective film close to the display and a side of the third phase delay film away from the third lens;

[0020] Alternatively, the third phase delay film is arranged on the side of the third lens close to the display, the third polarizing reflective film is arranged on the side of the third phase delay film away from the third lens, the number of the third anti-reflection films is two and they are respectively arranged on the side of the third lens away from the display and the side of the third polarizing reflective film away from the third lens; the fourth optical lens is a total reflection lens.

[0021] Optionally, the third optical lens includes a third lens, a third polarizing film, a third polarizing reflective film, a third phase delay film and a third anti-reflection film;

[0022] The third polarizing film is arranged on a side of the third lens close to the display, the third polarizing reflective film is arranged on a side of the third lens away from the display, the third phase delay film is arranged on a side of the third polarizing reflective film away from the third lens, and the number of the third anti-reflection films is two and they are respectively arranged on a side of the third polarizing film away from the third lens and a side of the third phase delay film away from the third lens;

[0023] Alternatively, the third polarizing film is arranged on a side of the third lens away from the display, the third polarizing reflective film is arranged on a side of the third polarizing film away from the third lens, the third phase delay film is arranged on a side of the third polarizing reflective film away from the third lens, and the number of the third anti-reflection films is two and they are respectively arranged on a side of the third lens close to the display and a side of the third phase delay film away from the third lens;

[0024] Alternatively, the third phase retardation film is arranged on the side of the third lens close to the display, the third polarizing reflective film is arranged on the side of the third phase retardation film away from the third lens, the third polarizing film is arranged on the side of the third polarizing reflective film away from the third lens, the number of the third anti-reflection films is two and they are respectively arranged on the side of the third lens away from the display and the side of the third polarizing film away from the third lens; the fourth optical lens is a total reflection lens.

[0025] Optionally, the first optical system component includes a third optical lens and a fourth optical lens, the third optical lens is arranged on the light output path of the display, the fourth optical lens is arranged on the reflected light path of the third optical lens, the fourth optical lens is a total reflection lens, and the first optical lens is arranged on the transmitted light path of the third optical lens.

[0026] Optionally, the third optical lens includes a third lens, a third polarized reflective film, a third phase delay film, a fourth phase delay film and a third anti-reflection film;

[0027] The third polarizing reflective film is arranged on a side of the third lens close to the display, the third phase delay film is arranged on a side of the third polarizing reflective film away from the third lens, the fourth phase delay film is arranged on a side of the third lens away from the display, and the number of the third anti-reflection films is two and they are respectively arranged on a side of the third phase delay film away from the third lens and a side of the fourth phase delay film away from the third lens;

[0028] Alternatively, the fourth phase retardation film is arranged on a side of the third lens close to the display, the third polarizing reflective film is arranged on a side of the fourth phase retardation film away from the third lens, the third phase retardation film is arranged on a side of the third polarizing reflective film away from the third lens, and the number of the third anti-reflection films is two and they are respectively arranged on a side of the third lens away from the display and a side of the third phase retardation film away from the third lens;

[0029] Alternatively, the third phase retardation film is arranged on the side of the third lens away from the display, the third polarizing reflective film is arranged on the side of the third phase retardation film away from the third lens, the fourth phase retardation film is arranged on the side of the third polarizing reflective film away from the third lens, and the number of the third anti-reflection films is two and they are respectively arranged on the side of the fourth phase retardation film away from the third lens and on the side of the third lens close to the display.

[0030] Optionally, a fifth optical lens is provided on the optical path between the display and the third optical lens, a sixth optical lens is provided on the optical path between the third optical lens and the fourth optical lens, and a seventh optical lens is provided on the optical path between the third optical lens and the first optical lens, and the fifth optical lens, the sixth optical lens and the seventh optical lens are all transmitting lenses.

[0031] Optionally, an eighth optical lens is provided on the optical path between the display and the third optical lens, a sixth optical lens is provided on the optical path between the third optical lens and the fourth optical lens, and a seventh optical lens is provided on the optical path between the third optical lens and the first optical lens, and both the sixth optical lens and the seventh optical lens are transmissive lenses;

[0032] The eighth optical lens comprises an eighth lens, an eighth polarizing film, an eighth phase delay film and an eighth anti-reflection film;

[0033] The eighth phase retardation film is arranged on a side of the eighth lens close to the display, the eighth polarization film is arranged on a side of the eighth phase retardation film away from the eighth lens, and the number of the eighth anti-reflection films is two and they are respectively arranged on a side of the eighth polarization film close to the display and a side of the eighth lens away from the display;

[0034] Alternatively, the eighth phase retardation film is arranged on a side of the eighth lens away from the display, the eighth polarization film is arranged on a side of the eighth lens close to the display, and the number of the eighth anti-reflection films is two and they are respectively arranged on a side of the eighth polarization film away from the eighth lens and a side of the eighth phase retardation film away from the eighth lens;

[0035] Alternatively, the eighth polarizing reflective film is arranged on the side of the eighth lens away from the display, the eighth phase delay film is arranged on the side of the eighth polarizing reflective film away from the eighth lens, and the number of the eighth anti-reflection films is two and they are respectively arranged on the side of the eighth lens close to the display and the side of the eighth phase delay film away from the eighth lens.

[0036] Optionally, the distance between the center of the first lens and the center of the third lens is T1, the distance between the center of the first lens and the center of the second lens is T2, the distance between the center of the third lens and the center of the fourth optical lens is T3, and the distance between the center of the third lens and the display is T4, which satisfies: T1≤50mm, T2≤50mm, T3+T4≤70mm.

[0037] Optionally, a curvature radius of a side surface of the fourth optical lens close to the third optical lens is R40, which satisfies: 10 mm ≤ |R40|.

[0038] Optionally, the angle formed by the optical axis of the third optical lens and the light output path of the display is α, 20°≤α≤70°.

[0039] Optionally, the field of view angle of the optical display system is FOV, which satisfies: 30°≤FOV≤60°; the focal length of the optical display system is f, which satisfies: |f|≤60mm; the focal length of the first optical system component is f1, which satisfies: 10mm≤|f1|≤100mm; the focal length of the second optical system component is f2, which satisfies: 10mm≤|f2|≤100mm; the image height of the optical display system is IMGH, which satisfies: 0.5≤|f1 / IMGH|≤10, 0.5≤|f2 / IMGH|≤10, |IMGH / f|≤6.

[0040] Optionally, the optical display system can form a virtual image visible to an observer. In the right-hand rectangular coordinate system O-xyz, the optical display system defines the light path direction of the display as the negative direction of the Z axis. Then, the range in which the human eye can move in the Z direction or the Y direction relative to the optical display system with a folded optical path is EB, which satisfies 5mm≤EB≤25mm; the distance between the human eye and the outermost optical lens in the second optical system component is ER, which satisfies 0.2≤ER / EB≤5; the distance between the virtual image formed by the optical display system with a folded optical path and the human eye is OB, and 0.1m≤OB≤10m.

[0041] Optionally, the optical path directions of the third optical lens and the fourth optical lens are consistent with the Z-axis direction, and the optical path direction of the reflected light of the first optical lens is consistent with the X-axis direction.

[0042] Among the above-mentioned optical lenses, the role of the anti-reflection film is to improve the transmittance of the optical lens and reduce the impact of stray light on the system; the role of the partially transmissive and partially reflective film is to allow part of the light to transmit through the optical lens and part of the light to be reflected, thereby realizing the simultaneous observation of the real world and the virtual world; the role of the polarization absorption film is to absorb linearly polarized light in a certain direction and transmit linearly polarized light in another direction; the role of the polarization reflection film is to reflect linearly polarized light in a certain direction and transmit linearly polarized light in another direction; the phase delay film is a quarter-wave plate, and its role is to convert circularly polarized light into linearly polarized light or convert linearly polarized light into circularly polarized light.

[0043] In each optical lens disclosed in the present invention, the thickness of all polarization absorption films, polarization reflection films and phase delay films is less than 0.5 mm.

[0044] In the present invention, the material used to make the above optical lenses can be plastic or glass, and the refractive index of the selected material is N, and the dispersion coefficient is V, which satisfies 1.3<N<1.8, 20<V<90.

[0045] The aspheric surface (ASP) curve equations of the above lenses are as follows:

[0046]

[0047] In the formula, r is the distance vector height from the fixed point of the aspheric surface when the aspheric surface is at a height of h along the optical axis, c is the curvature of the aspheric surface, that is, c = 1 / R (R is the radius of curvature), k is the cone coefficient, and Ai is the coefficient of the i-th order of the aspheric surface.

[0048] An embodiment of the present invention further provides an AR device, comprising a wearable component and the optical display system with a folded light path as described above, wherein the optical display system with a folded light path is arranged on the wearable component.

[0049] The beneficial effects of the present invention are:

[0050] The optical display system provided by the embodiment of the present invention has a small volume, good imaging quality and a large field of view angle range.

[0051] The AR device provided in the embodiment of the present invention is easy to wear and can be adapted for use by people with different degrees of myopia through an adjustment system, so that myopic users can see both the digital world and the real world clearly at the same time without the need for additional myopia lenses, thereby ensuring viewing comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 Schematic diagram of the optical architecture of an optical display system with a folded optical path according to the first embodiment of the present invention;

[0053] Figure 2 This is an MTF curve diagram of the first embodiment of the present invention;

[0054] Figure 3 Schematic diagram of the optical architecture of an optical display system with a folded optical path according to the second embodiment of the present invention;

[0055] Figure 4 This is an MTF curve diagram of the second embodiment of the present invention;

[0056] Figure 5 Schematic diagram of the optical architecture of an optical display system with a folded optical path according to the third embodiment of the present invention;

[0057] Figure 6 This is an MTF curve diagram of the third embodiment of the present invention;

[0058] Figure 7 This is a schematic diagram of the structure of an AR device according to Embodiment 4 of the present invention;

[0059] In the figure: 10-first optical lens; 11-first lens; 12-first polarization absorption film; 13-first polarization reflection film; 14-first phase delay film; 15-first anti-reflection film; 20-second optical lens; 21-second lens; 22-compensation mirror; 23-second phase delay film; 24-second linear polarization film; 25-second partially transmitting and partially reflecting film; 26-second anti-reflection film; 30-third optical lens; 31-third lens; 32-third polarization reflection film; 33-third phase delay film; 34-third anti-reflection film ; 35-third polarizing film; 36-fourth phase delay film; 40-fourth optical lens; 50-fifth optical lens; 60-sixth optical lens; 70-seventh optical lens; 80-eighth optical lens; 81-eighth lens; 82-eighth polarizing film; 83-eighth phase delay film; 84-eighth anti-reflection film; 90-display; 91-human eye; 92-wearable part; 100-optical display system with folded optical path; 200-optical display system with folded optical path; 300-optical display system with folded optical path. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0061] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0062] In the description of the present invention, it should be noted that the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0063] Example 1

[0064] refer to Figure 1 As shown, the first embodiment of the present invention provides an optical display system 100 with a folded optical path, including a display 90, a first optical system component and a second optical system component.

[0065] The display 90 mainly emits light. The display 90 can display 2D or 3D images or videos. The display 90 can be an OLED display, an LCD display, an LCOS display, a micro-LED display, a micro-OLED display or a mini-LED display, etc. In this embodiment, the display 90 is an OLED display.

[0066] The first optical system component includes a third optical lens 30 and a fourth optical lens 40. The third optical lens 30 is arranged on the light output path of the display 90, and the fourth optical lens 40 is arranged on the transmitted light path of the third optical lens 30. The fourth optical lens 40 is a total reflection lens.

[0067] The angle formed between the optical axis of the third optical lens 30 and the light path of the display 90 is α, α=45°. Of course, α can also be 20°, 30°, 40°, 50°, 60°, 70°, etc.

[0068] The curvature radius of the surface of one side of the fourth optical lens 40 close to the third optical lens 30 is R40, which satisfies: R40=28 mm.

[0069] The third optical lens 30 includes a third lens 31, a third polarizing reflective film 32, a third phase delay film 33 and a third anti-reflection film 34. The third polarizing reflective film 32 is arranged on the side of the third lens 31 away from the display 90, the third phase delay film 33 is arranged on the side of the third polarizing reflective film 32 away from the third lens 31, and the number of the third anti-reflection film 34 is two and they are arranged on the side of the third lens 31 close to the display 90 and the side of the third phase delay film 33 away from the third lens 31 respectively.

[0070] The second optical system component includes a first optical lens 10 and a second optical lens 20 . The first optical lens 10 is arranged on the reflected light path of the third optical lens 30 , and the second optical lens 20 is arranged on the reflected light path of the first optical lens 10 .

[0071] The optical axis of the first optical lens 10 and the reflected light path of the third optical lens 30 form an angle β, which satisfies β = 45°. Of course, β can also be 20°, 30°, 40°, 50°, 60°, 70°, etc.

[0072] The first optical lens 10 includes a first lens 11, a first polarizing absorption film 12, a first polarizing reflection film 13, a first phase delay film 14 and a first anti-reflection film 15. The first polarizing absorption film 12 is arranged on a side of the first lens 11 close to the first optical system component, the first polarizing reflection film 13 is arranged on a side of the first polarizing absorption film 12 away from the first lens 11, the first phase delay film 14 is arranged on a side of the first polarizing reflection film 13 away from the first lens 11, and the number of the first anti-reflection film 15 is two and they are respectively arranged on a side of the first phase delay film 14 away from the first lens 11 and a side of the first lens 11 away from the first polarizing absorption film 12.

[0073] The second optical lens 20 includes a second lens 21, a compensation mirror 22, a second phase delay film 23, a second linear polarizing film 24, a second partially transmissive and partially reflective film 25, and a second anti-reflective film 26. The compensation mirror 22 is disposed on a side of the second lens 21 away from the first optical lens 10, the second phase delay film 23 is disposed on a side of the compensation mirror 22 away from the second lens 21, the second linear polarizing film 24 is disposed on a side of the second phase delay film 23 away from the second lens 21, the second anti-reflective film 26 is disposed on a side of the second linear polarizing film 24 away from the second lens 21, and the second partially transmissive and partially reflective film 25 is disposed on a side of the second lens 21 away from the compensation mirror 22.

[0074] The curvature radius of the side surface of the second lens 21 close to the first optical lens 10 is R211, and the curvature radius of the side surface of the second lens 21 away from the first optical lens 10 is R212, which satisfies: |R211|=43.49mm, |R212|=43.49mm.

[0075] A fifth optical lens 50 may be further provided on the optical path between the display 90 and the third optical lens 30, a sixth optical lens 60 may be further provided on the optical path between the third optical lens 30 and the fourth optical lens 40, and a seventh optical lens 70 may be further provided on the optical path between the third optical lens 30 and the first optical lens 10. The fifth optical lens 50, the sixth optical lens 60 and the seventh optical lens 70 are all transmissive lenses. The number of the fifth optical lens 50, the sixth optical lens 60 and the seventh optical lens 70 may be one or more.

[0076] The field of view angle FOV of the optical display system with a folded optical path in this embodiment is 42°; the focal length f is 16.15 mm, the focal length of the first optical system component is f1=21.747 mm, and the focal length of the second optical system component is f2=21.960 mm.

[0077] The image height of the optical display system is IMGH, which satisfies: |f1 / IMGH|=1.7, |f2 / IMGH|=1.7, |IMGH / f|=1.2.

[0078] The distance between the center of the first lens 11 and the center of the third lens 31 is T1, the distance between the center of the first lens 11 and the center of the second lens 21 is T2, the distance between the center of the third lens 31 and the center of the fourth optical lens 40 is T3, and the distance between the center of the third lens 31 and the display 90 is T4, which satisfies: T1=19.5mm, T2=40mm, T3+T4=30mm.

[0079] In the right-hand rectangular coordinate system O-xyz, the optical display system with a folded optical path defines the light path direction of the display 90 as the negative direction of the Z axis, and the range in which the human eye 91 can move relative to the optical display system in the Z direction or the Y direction is EB (Eye Box), which satisfies 5mm≤EB≤25mm; the distance between the human eye 91 and the outermost optical lens in the optical system component is ER (Eye Relief), which satisfies 0.2≤ER / EB≤5; the adjustable distance of the virtual image formed by the optical display system with a folded optical path from the human eye 91 is OB, 0.1m≤OB≤10m. The larger the EB and ER, the more it can ensure that the human eye 91 can see a complete and clear picture when moving in a larger range.

[0080] It should be noted that the optical path direction of the third optical lens 30 and the fourth optical lens 40 is consistent with the Z-axis direction, and the optical path direction of the reflected light of the first optical lens 10 is consistent with the X-axis direction.

[0081] For detailed parameters of each optical structure in this embodiment, please refer to Table 1 and Table 2.

[0082] Table 1

[0083]

[0084]

[0085]

[0086] Table 2

[0087] Face number S46 S47 k -0.10 -90 A4 3.256E-005 9.490E-006 A6 -3.302E-006 -8.721E-006 A8 1.651E-007 7.376E-007 A10 -1.604E-009 -1.092E-008

[0088] Table 1 shows the optical structure data related to the first embodiment. Since the optical path is designed in reverse in the optical design software, surfaces S0 to S49 represent the surfaces that the light passes through in sequence from the virtual image position to the display 90. The thickness represents the distance from the surface to the next surface, 0 represents that the two surfaces are close together, and a negative value represents that the light is reflected on the surface.

[0089] Table 2 shows the aspheric surface data of the relevant optical structure in Example 1, wherein k is the cone coefficient in the above curve equation, and A4 to A10 represent the 4th to 10th order aspheric surface coefficients of each surface.

[0090] Figure 2This is the MTF curve of this embodiment. MTF is the abbreviation of Modulation Transfer Function, which is a way to describe the performance of an optical system and can judge the ability of an optical system to restore contrast. The horizontal axis represents spatial frequency, the vertical axis represents contrast, the solid line represents the meridian direction, and the dotted line represents the sagittal direction. It can be seen from the figure that the optical system has good resolution in different fields and directions.

[0091] The imaging principle of the optical display system with a folded light path of this embodiment is as follows:

[0092] The unpolarized light emitted by the display 90 first enters the fifth optical lens 50, and the light is transmitted from the fifth optical lens 50 and enters the third optical lens 30. After being processed by the third optical lens 30, the light is converted into circularly polarized light and transmitted out, and then enters the sixth optical lens 60. The light transmitted from the sixth optical lens 60 enters the fourth optical lens 40, the light is reflected in the fourth optical lens 40, and then enters the sixth optical lens 60 again. The light transmitted from the sixth optical lens 60 enters the third optical lens 30 again and is reflected into the seventh optical lens 70. The light is optically transmitted from the seventh optical lens 70 and enters the first optical lens 10. The light is reflected in the first optical lens 10 and enters the second optical lens 20. The light is reflected in the second optical lens 20 and enters the first optical lens 10 again, and then is processed by the first optical lens 10 to become linearly polarized light and transmitted out to reach the human eye 91 to form a virtual image of a specific imaging position and a specific magnification.

[0093] The second phase retardation film 23 and the second linear polarization film 24 can absorb the leaked light while having little influence on observing the outside world through the optical system.

[0094] By reasonably setting the surface parameters of each optical lens in the optical display system, the aberration of the optical display system can be greatly reduced, the system resolution can be improved, and the image quality can be enhanced.

[0095] Example 2

[0096] refer to Figure 3 As shown, the second embodiment of the present invention provides an optical display system 200 with a folded optical path, including a display 90, a first optical system component and a second optical system component.

[0097] The display 90 mainly emits light. The display 90 can display 2D or 3D images or videos. The display 90 can be an OLED display, an LCD display, an LCOS display, a micro-LED display, a micro-OLED display or a mini-LED display, etc. In this embodiment, the display 90 is an OLED display.

[0098] The first optical system component includes a third optical lens 30 and a fourth optical lens 40. The third optical lens 30 is arranged on the light output path of the display 90, and the fourth optical lens 40 is arranged on the transmitted light path of the third optical lens 30. The fourth optical lens 40 is a total reflection lens.

[0099] The angle formed between the optical axis of the third optical lens 30 and the light path of the display 90 is α, α = 45°. Of course, α can also be 20°, 30°, 40°, 50°, 60°, 65°, 70°, etc.

[0100] The curvature radius of the surface of one side of the fourth optical lens 40 close to the third optical lens 30 is R40, which satisfies: R40=31 mm.

[0101] The third optical lens 30 includes a third lens 31, a third polarizing film 35, a third polarizing reflective film 32, a third phase delay film 33 and a third anti-reflection film 34. The third polarizing film 35 is arranged on the side of the third lens 31 close to the display 90, the third polarizing reflective film 32 is arranged on the side of the third lens 31 away from the display 90, the third phase delay film 33 is arranged on the side of the third polarizing reflective film 32 away from the third lens 31, and the number of the third anti-reflection film 34 is two and they are respectively arranged on the side of the third polarizing film 35 away from the third lens 31 and the side of the third phase delay film 33 away from the third lens 31.

[0102] The second optical system component includes a first optical lens 10 and a second optical lens 20 . The first optical lens 10 is arranged on the reflected light path of the third optical lens 30 , and the second optical lens 20 is arranged on the reflected light path of the first optical lens 10 .

[0103] The optical axis of the first optical lens 10 and the reflected light path of the third optical lens 30 form an angle β, which satisfies β = 45°. Of course, β can also be 20°, 30°, 40°, 50°, 60°, 70°, etc.

[0104] The first optical lens 10 includes a first lens 11, a first polarizing absorption film 12, a first polarizing reflection film 13, a first phase delay film 14 and a first anti-reflection film 15. The first polarizing absorption film 12 is arranged on a side of the first lens 11 away from the first optical system component, the first polarizing reflection film 13 is arranged on a side of the first lens 11 close to the first optical system component, the first phase delay film 14 is arranged on a side of the first polarizing reflection film 13 away from the first lens 11, and the number of the first anti-reflection film 15 is two and they are arranged on a side of the first phase delay film 14 away from the first lens 11 and a side of the first polarizing absorption film 12 away from the first lens 11, respectively.

[0105] The second optical lens 20 includes a second lens 21, a compensation mirror 22, a second phase delay film 23, a second linear polarizing film 24, a second partially transmissive partially reflective film 25, and a second anti-reflective film 26. The second partially transmissive partially reflective film 25 is disposed on a side of the second lens 21 away from the first optical lens 10, the compensation mirror 22 is disposed on a side of the second partially transmissive partially reflective film 25 away from the first optical lens 10, the second phase delay film 23 is disposed on a side of the compensation mirror 22 away from the second lens 21, the second linear polarizing film 24 is disposed on a side of the second phase delay film 23 away from the second lens 21, and the second anti-reflective film 26 is disposed on a side of the second linear polarizing film 24 away from the second lens 21.

[0106] The curvature radius of the side surface of the second lens 21 close to the first optical lens 10 is R211, and the curvature radius of the side surface of the second lens 21 away from the first optical lens 10 is R212, which satisfies: |R211|=44.4mm, |R212|=44.4mm.

[0107] A fifth optical lens 50 may be further provided on the optical path between the display 90 and the third optical lens 30, a sixth optical lens 60 may be further provided on the optical path between the third optical lens 30 and the fourth optical lens 40, and a seventh optical lens 70 may be further provided on the optical path between the third optical lens 30 and the first optical lens 10. The fifth optical lens 50, the sixth optical lens 60 and the seventh optical lens 70 are all transmissive lenses. The number of the fifth optical lens 50, the sixth optical lens 60 and the seventh optical lens 70 may be one or more.

[0108] The field of view angle FOV of the optical display system with a folded optical path in this embodiment is 46°; the focal length f is 16.17 mm, the focal length of the first optical system component is f1=34.83 mm, and the focal length of the second optical system component is f2=22.19 mm.

[0109] The image height of the optical display system is IMGH, which satisfies: |f1 / IMGH|=2.7, |f2 / IMGH|=1.7, |IMGH / f|=1.24.

[0110] The distance between the center of the first lens 11 and the center of the third lens 31 is T1, the distance between the center of the first lens 11 and the center of the second lens 21 is T2, the distance between the center of the third lens 31 and the center of the fourth optical lens 40 is T3, and the distance between the center of the third lens 31 and the display 90 is T4, which satisfies: T1=19.7mm, T2=39.6mm, T3+T4=33mm.

[0111] In the right-hand rectangular coordinate system O-xyz, the optical display system with a folded optical path defines the light path direction of the display 90 as the negative direction of the Z axis, and the range in which the human eye 91 can move relative to the optical display system in the Z direction or the Y direction is EB (Eye Box), which satisfies 5mm≤EB≤25mm; the distance between the human eye 91 and the outermost optical lens in the optical system component is ER (Eye Relief), which satisfies 0.2≤ER / EB≤5; the adjustable distance of the virtual image formed by the optical display system with a folded optical path from the human eye 91 is OB, 0.1m≤OB≤10m. The larger the EB and ER, the more it can ensure that the human eye 91 can see a complete and clear picture when moving in a larger range.

[0112] It should be noted that the optical path direction of the third optical lens 30 and the fourth optical lens 40 is consistent with the Z-axis direction, and the optical path direction of the reflected light of the first optical lens 10 is consistent with the X-axis direction.

[0113] For detailed parameters of each optical structure in this embodiment, please refer to Table 3 and Table 4.

[0114] Table 3

[0115]

[0116]

[0117]

[0118] Table 4

[0119] Face number S36 k 0.328 A4 -3.991E-006 A6 6.492E-009 A8 4.712E-011 A10 -1.430E-013

[0120] Table 3 shows the optical structure data related to the second embodiment. Since the optical path is designed in reverse in the optical design software, the surfaces S0 to S56 represent the surfaces that the light passes through in sequence from the virtual image position to the display 90. The thickness represents the distance from the surface to the next surface, 0 represents that the two surfaces are close together, and a negative value represents that the light is reflected on the surface.

[0121] Table 4 is the aspheric surface data of the relevant optical structure in Example 2, wherein k is the cone coefficient in the above curve equation, and A4 to A10 represent the 4th to 10th order aspheric surface coefficients of each surface.

[0122] Figure 4This is the MTF curve of this embodiment. MTF is the abbreviation of Modulation Transfer Function, which is a way to describe the performance of an optical system and can judge the ability of an optical system to restore contrast. The horizontal axis represents spatial frequency, the vertical axis represents contrast, the solid line represents the meridian direction, and the dotted line represents the sagittal direction. It can be seen from the figure that the optical system has good resolution in different fields and directions.

[0123] The imaging principle of the optical display system with a folded light path of this embodiment is as follows:

[0124] The unpolarized light emitted by the display 90 first enters the fifth optical lens 50, and the light is transmitted from the fifth optical lens 50 and enters the third optical lens 30. After being processed by the third optical lens 30, the light is converted into circularly polarized light and transmitted out, and then enters the sixth optical lens 60. The light transmitted from the sixth optical lens 60 enters the fourth optical lens 40, the light is reflected in the fourth optical lens 40, and then enters the sixth optical lens 60 again. The light transmitted from the sixth optical lens 60 enters the third optical lens 30 again and is reflected into the seventh optical lens 70. The light is optically transmitted from the seventh optical lens 70 and enters the first optical lens 10. The light is reflected in the first optical lens 10 and enters the second optical lens 20. The light is reflected in the second optical lens 20 and enters the first optical lens 10 again, and then is processed by the first optical lens 10 to become linearly polarized light and transmitted out to reach the human eye 91 to form a virtual image of a specific imaging position and a specific magnification.

[0125] The second phase retardation film 23 and the second linear polarization film 24 can absorb the leaked light while having little influence on observing the outside world through the optical system.

[0126] By reasonably setting the surface parameters of each optical lens in the optical display system, the aberration of the optical display system can be greatly reduced, the system resolution can be improved, and the image quality can be enhanced.

[0127] Example 3

[0128] refer to Figure 5 As shown, the third embodiment of the present invention provides an optical display system 300 with a folded optical path, including a display 90, a first optical system component and a second optical system component.

[0129] The display 90 mainly emits light. The display 90 can display 2D or 3D images or videos. The display 90 can be an OLED display, an LCD display, an LCOS display, a micro-LED display, a micro-LED display or a mini-LED display, etc. In this embodiment, the display 90 is an OLED display.

[0130] The first optical system component includes a third optical lens 30 and a fourth optical lens 40. The third optical lens 30 is arranged on the light output path of the display 90, and the fourth optical lens 40 is arranged on the reflected light path of the third optical lens 30. The fourth optical lens 40 is a total reflection lens.

[0131] The angle formed between the optical axis of the third optical lens 30 and the light path of the display 90 is α, α=45°. Of course, α can also be 20°, 30°, 40°, 50°, 60°, 65°, etc.

[0132] The radius of curvature of the surface of one side of the fourth optical lens 40 close to the third optical lens 30 is R40, which satisfies: R40=32 mm.

[0133] The third optical lens 30 includes a third lens 31, a third polarizing reflective film 32, a third phase delay film 33, a fourth phase delay film 36 and a third anti-reflection film 34. The third polarizing reflective film 32 is arranged on a side of the third lens 31 close to the display 90, the third phase delay film 33 is arranged on a side of the third polarizing reflective film 32 away from the third lens 31, the fourth phase delay film 36 is arranged on a side of the third lens 31 away from the display 90, and the number of the third anti-reflection film 34 is two and they are arranged on a side of the third phase delay film 33 away from the third lens 31 and a side of the fourth phase delay film 36 away from the third lens 31, respectively.

[0134] The second optical system component includes a first optical lens 10 and a second optical lens 20 . The first optical lens 10 is arranged on the reflected light path of the third optical lens 30 , and the second optical lens 20 is arranged on the reflected light path of the first optical lens 10 .

[0135] The optical axis of the first optical lens 10 and the reflected light path of the third optical lens 30 form an angle β, which satisfies β = 45°. Of course, β can also be 20°, 30°, 40°, 50°, 60°, 70°, etc.

[0136] The first optical lens 10 includes a first lens 11, a first polarizing absorption film 12, a first polarizing reflection film 13, a first phase delay film 14 and a first anti-reflection film 15. The first phase delay film 14 is arranged on a side of the first lens 11 away from the first optical system component, the first polarizing reflection film 13 is arranged on a side of the first phase delay film 14 away from the first lens 11, the first polarizing absorption film 12 is arranged on a side of the first polarizing reflection film 13 away from the first lens 11, and the number of the first anti-reflection film 15 is two and they are respectively arranged on a side of the first polarizing absorption film 12 away from the first lens 11 and a side of the first lens 11 away from the first optical system component.

[0137] The second optical lens 20 includes a second lens 21, a compensation mirror 22, a second phase delay film 23, a second linear polarizing film 24, a second partially transmissive partially reflective film 25, and a second anti-reflective film 26. The second partially transmissive partially reflective film 25 is disposed on a side of the second lens 21 close to the first optical lens 10, the compensation mirror 22 is disposed on a side of the first optical lens 10 away from the second partially transmissive partially reflective film 25, the second phase delay film 23 is disposed on a side of the compensation mirror 22 away from the second lens 21, the second linear polarizing film 24 is disposed on a side of the second phase delay film 23 away from the second lens 21, and the second anti-reflective film 26 is disposed on a side of the second linear polarizing film 24 away from the second lens 21.

[0138] The curvature radius of the side surface of the second lens 21 close to the first optical lens 10 is R211, and the curvature radius of the side surface of the second lens 21 away from the first optical lens 10 is R212, which satisfies: |R211|=44.9mm, |R212|=44.9mm.

[0139] An eighth optical lens 80 may be further provided on the optical path between the display 90 and the third optical lens 30, a sixth optical lens 60 may be further provided on the optical path between the third optical lens 30 and the fourth optical lens 40, and a seventh optical lens 70 may be further provided on the optical path between the third optical lens 30 and the first optical lens 10, and both the sixth optical lens 60 and the seventh optical lens 70 are transmissive lenses. The number of the sixth optical lens 60 and the seventh optical lens 70 may be one or more.

[0140] The eighth optical lens 80 includes an eighth lens 81, an eighth polarizing film 82, an eighth phase delay film 83 and an eighth anti-reflection film 84. The eighth phase delay film 83 is arranged on the side of the eighth lens 81 close to the display 90, the eighth polarizing film 82 is arranged on the side of the eighth phase delay film 83 away from the eighth lens 81, and the number of the eighth anti-reflection film 84 is two and they are respectively arranged on the side of the eighth polarizing film 82 close to the display 90 and the side of the eighth lens 81 away from the display 90.

[0141] The field of view angle FOV of the optical display system with a folded optical path in this embodiment is 42°; the focal length f is 16.60 mm, the focal length of the first optical system component is f1=63.348 m, and the focal length of the second optical system component is f2=22.472 mm.

[0142] The image height of the optical display system is IMGH, which satisfies: |f1 / IMGH|=4.8, |f2 / IMGH|=1.7, |IMGH / f|=1.3.

[0143] The distance between the center of the first lens 11 and the center of the third lens 31 is T1, the distance between the center of the first lens 11 and the center of the second lens 21 is T2, the distance between the center of the third lens 31 and the center of the fourth optical lens 40 is T3, and the distance between the center of the third lens 31 and the display 90 is T4, which satisfies: T1=18.0mm, T2=39mm, T3+T4=35mm.

[0144] In the right-hand rectangular coordinate system O-xyz, the optical display system with a folded optical path defines the light path direction of the display 90 as the negative direction of the Z axis, and the range in which the human eye 91 can move relative to the optical display system in the Z direction or the Y direction is EB (Eye Box), which satisfies 5mm≤EB≤25mm; the distance between the human eye 91 and the outermost optical lens in the optical system component is ER (Eye Relief), which satisfies 0.2≤ER / EB≤5; the adjustable distance of the virtual image formed by the optical display system with a folded optical path from the human eye 91 is OB, 0.1m≤OB≤10m. The larger the EB and ER, the more it can ensure that the human eye 91 can see a complete and clear picture when moving in a larger range.

[0145] It should be noted that the optical path direction of the third optical lens 30 and the fourth optical lens 40 is consistent with the Z-axis direction, and the optical path direction of the reflected light of the first optical lens 10 is consistent with the X-axis direction.

[0146] For detailed parameters of each optical structure in this embodiment, please refer to Table 5 and Table 6.

[0147] Table 5

[0148]

[0149]

[0150]

[0151] Table 6

[0152] Face number S41 k 8.207 A4 -2.445E-005 A6 -4.083E-008 A8 1.254E-010 A10 -3.080E-012

[0153] Table 5 shows the optical structure data of the third embodiment. Since the optical path is designed in reverse in the optical design software, the surfaces S0 to S63 represent the surfaces that the light passes through in sequence from the virtual image position to the display 90. The thickness represents the distance that the light travels from the surface to the next surface. 0 represents that the two surfaces are close together, and a negative value represents that the light is reflected on the surface.

[0154] Table 6 is the aspheric surface data of the relevant optical structure in Example 3, where k is the cone coefficient in the above curve equation, and A4 to A10 represent the 4th to 10th order aspheric surface coefficients of each surface.

[0155] Figure 6 This is the MTF curve of this embodiment. MTF is the abbreviation of Modulation Transfer Function, which is a way to describe the performance of an optical system and can judge the ability of an optical system to restore contrast. The horizontal axis represents spatial frequency, the vertical axis represents contrast, the solid line represents the meridian direction, and the dotted line represents the sagittal direction. It can be seen from the figure that the optical system has good resolution in different fields and directions.

[0156] The imaging principle of the optical display system with a folded light path of this embodiment is as follows:

[0157] The unpolarized light emitted by the display 90 first enters the eighth optical lens 80, and the light is transmitted from the eighth optical lens 80 and enters the third optical lens 30. After being processed by the third optical lens 30, the light is converted into circularly polarized light and reflected, and then enters the sixth optical lens 60. The light transmitted from the sixth optical lens 60 enters the fourth optical lens 40, the light is reflected in the fourth optical lens 40, and then enters the sixth optical lens 60. The light transmitted from the sixth optical lens 60 enters the third optical lens 30 again and is transmitted into the seventh optical lens 70. The light is transmitted from the seventh optical lens 70 and enters the first optical lens 10. The light is reflected in the first optical lens 10 and enters the second optical lens 20. The light is reflected in the second optical lens 20 and enters the first optical lens 10 again. Then, it is processed by the first optical lens 10 and converted into linearly polarized light and transmitted to reach the human eye 91 to form a virtual image of a specific imaging position and a specific magnification.

[0158] The second phase retardation film 23 and the second linear polarization film 24 can absorb the leaked light while having little influence on observing the outside world through the optical system.

[0159] Example 4

[0160] refer to Figure 7 As shown, a fourth embodiment of the present invention provides an AR device, including a wearable component 92 and an optical display system 100 with a folded optical path.

[0161] It should be noted that the optical display system with a folded optical path in this embodiment can adopt the optical display system with a folded optical path in Example 1, Example 2 or Example 3. Its structure, working principle and technical effects produced refer to the corresponding contents in Example 1, Example 2 and Example 3, and will not be repeated here.

[0162] The optical display system 100 with a folded optical path is arranged on a wearable component 92. The wearable component 92 may be a helmet or a glasses frame, etc., so that it is convenient for people to wear it on their heads. Of course, the AR device also includes a control unit, a storage unit, etc. The control unit is convenient for controlling the device, and the storage unit is convenient for storing images, videos, etc.

[0163] When in use, the distance between the optical lenses can be adjusted manually or electrically, or the distance between the lens and the display screen can be changed to change the position of the virtual image, so as to better meet the viewing needs of myopic users for digital images. When the virtual image distance of the system is regularly adjusted from near to far or from far to near, the ciliary muscles of the user's eyes can be exercised in the repeated focusing process, which plays a role in protecting the eyes and correcting vision.

[0164] The present invention is not limited to the above optional implementations, and anyone can derive other various forms of products under the enlightenment of the present invention. The above specific implementations should not be understood as limiting the scope of protection of the present invention. The scope of protection of the present invention should be based on the definition in the claims, and the description can be used to interpret the claims.

Claims

1. An optical display system with a folded optical path, characterized in that: The device comprises a display, a first optical system component and a second optical system component, wherein the first optical system component is arranged on a light-emitting path of the display, and the second optical system component comprises a first optical lens and a second optical lens, wherein the first optical lens is arranged on a light-emitting path of the first optical system component, and the second optical lens is arranged on a reflected light path of the first optical lens, and an optical axis of the first optical lens forms an angle β with the light-emitting path of the first optical system component, which satisfies 20°≤β≤70°; The first optical system component includes a third optical lens and a fourth optical lens, the third optical lens is arranged on the light output path of the display, the fourth optical lens is arranged on the light transmission path of the third optical lens, the fourth optical lens is a total reflection lens, and the first optical lens is arranged on the light reflection path of the third optical lens; The distance between the center of the first optical lens and the center of the third optical lens is T1, the distance between the center of the first optical lens and the center of the second optical lens is T2, the distance between the center of the third optical lens and the center of the fourth optical lens is T3, and the distance between the center of the third optical lens and the display is T4, which satisfies: 19.5mm≤T1≤19.7mm, 39.6mm≤T2≤40mm, 30mm≤T3+T4≤33mm; The field of view of the optical display system is FOV, which satisfies: 42°≤FOV≤46°; the focal length of the optical display system is f, which satisfies: 16.15 mm≤|f|≤16.17 mm; the focal length of the first optical system component is f1, which satisfies: 21.747 mm≤|f1|≤34.83 mm; the focal length of the second optical system component is f2, which satisfies: 21.960 mm≤|f2|≤22.19 mm; the image height of the optical display system is IMGH, which satisfies: 1.7≤|f1 / IMGH|≤2.7, |f2 / IMGH|=1.7, 1.2≤|IMGH / f|≤1.24; The optical display system can form a virtual image visible to an observer. In the right-hand rectangular coordinate system O-xyz, the optical display system defines the light path direction of the display as the negative direction of the Z axis. Then, the range in which the human eye can move in the Z direction or the Y direction relative to the optical display system with a folded optical path is EB, which satisfies 5mm≤EB≤25mm; the distance between the human eye and the outermost optical lens in the second optical system component is ER, which satisfies 0.2≤ER / EB≤5; the distance between the virtual image formed by the optical display system with a folded optical path and the human eye is OB, and 0.1m≤OB≤10m.

2. The optical display system with a folded optical path according to claim 1, characterized in that: The first optical lens includes a first lens, a first polarization absorption film, a first polarization reflection film, a first phase delay film and a first anti-reflection film; The first polarizing absorption film is arranged on a side of the first lens close to the first optical system component, the first polarizing reflection film is arranged on a side of the first polarizing absorption film away from the first lens, the first phase delay film is arranged on a side of the first polarizing reflection film away from the first lens, and the number of the first anti-reflection films is two and they are respectively arranged on a side of the first phase delay film away from the first lens and a side of the first lens away from the first polarizing absorption film; Alternatively, the first polarizing absorption film is arranged on a side of the first lens away from the first optical system component, the first polarizing reflection film is arranged on a side of the first lens close to the first optical system component, the first phase delay film is arranged on a side of the first polarizing reflection film away from the first lens, and the number of the first anti-reflection films is two and they are respectively arranged on a side of the first phase delay film away from the first lens and a side of the first polarizing absorption film away from the first lens; Alternatively, the first phase delay film is arranged on the side of the first lens away from the first optical system component, the first polarizing reflective film is arranged on the side of the first phase delay film away from the first lens, the first polarizing absorption film is arranged on the side of the first polarizing reflective film away from the first lens, and the number of the first anti-reflection films is two and they are respectively arranged on the side of the first polarizing absorption film away from the first lens and the side of the first lens away from the first optical system component.

3. The optical display system with a folded optical path according to claim 1, characterized in that: The second optical lens comprises a second lens, a compensation mirror, a second phase delay film, a second linear polarization film, a second partially transmissive and partially reflective film, and a second anti-reflection film; The compensation mirror is arranged on a side of the second lens away from the first optical lens, the second phase delay film is arranged on a side of the compensation mirror away from the second lens, the second linear polarization film is arranged on a side of the second phase delay film away from the second lens, the second anti-reflection film is arranged on a side of the second linear polarization film away from the second lens, and the second partially transmissive and partially reflective film is arranged on a side of the second lens away from the compensation mirror; Alternatively, the second partially transmissive partially reflective film is arranged on the side of the second lens away from the first optical lens, the compensation mirror is arranged on the side of the second partially transmissive partially reflective film away from the first optical lens, the second phase delay film is arranged on the side of the compensation mirror away from the second lens, the second linear polarizing film is arranged on the side of the second phase delay film away from the second lens, and the second anti-reflection film is arranged on the side of the second linear polarizing film away from the second lens.

4. The optical display system with a folded optical path according to claim 3, characterized in that: The curvature radius of the surface of the second lens close to the first optical lens is R211, and the curvature radius of the surface of the second lens away from the first optical lens is R212, which satisfies: 43.49mm≤|R211|≤44.4mm, 43.49mm≤|R212|≤44.4mm.

5. The optical display system with a folded optical path according to claim 1, characterized in that: The third optical lens comprises a third lens, a third polarizing reflective film, a third phase delay film and a third anti-reflection film; The third polarizing reflective film is arranged on a side of the third lens away from the display, the third phase delay film is arranged on a side of the third polarizing reflective film away from the third lens, and the number of the third anti-reflection films is two and they are arranged on a side of the third lens close to the display and a side of the third phase delay film away from the third lens respectively; Alternatively, the third polarizing reflective film is arranged on a side of the third lens close to the display, the third phase delay film is arranged on a side of the third lens away from the display, and the number of the third anti-reflection films is two and they are respectively arranged on a side of the third polarizing reflective film close to the display and a side of the third phase delay film away from the third lens; Alternatively, the third phase delay film is arranged on the side of the third lens close to the display, the third polarizing reflective film is arranged on the side of the third phase delay film away from the third lens, the number of the third anti-reflection films is two and they are respectively arranged on the side of the third lens away from the display and the side of the third polarizing reflective film away from the third lens; the fourth optical lens is a total reflection lens.

6. The optical display system with a folded optical path according to claim 1, characterized in that: The third optical lens comprises a third lens, a third polarizing film, a third polarizing reflective film, a third phase delay film and a third anti-reflection film; The third polarizing film is arranged on a side of the third lens close to the display, the third polarizing reflective film is arranged on a side of the third lens away from the display, the third phase delay film is arranged on a side of the third polarizing reflective film away from the third lens, and the number of the third anti-reflection films is two and they are respectively arranged on a side of the third polarizing film away from the third lens and a side of the third phase delay film away from the third lens; Alternatively, the third polarizing film is arranged on a side of the third lens away from the display, the third polarizing reflective film is arranged on a side of the third polarizing film away from the third lens, the third phase delay film is arranged on a side of the third polarizing reflective film away from the third lens, and the number of the third anti-reflection films is two and they are respectively arranged on a side of the third lens close to the display and a side of the third phase delay film away from the third lens; Alternatively, the third phase retardation film is arranged on the side of the third lens close to the display, the third polarizing reflective film is arranged on the side of the third phase retardation film away from the third lens, the third polarizing film is arranged on the side of the third polarizing reflective film away from the third lens, the number of the third anti-reflection films is two and they are respectively arranged on the side of the third lens away from the display and the side of the third polarizing film away from the third lens; the fourth optical lens is a total reflection lens.

7. The optical display system with a folded optical path according to claim 1, 5 or 6, characterized in that: A fifth optical lens is provided on the optical path between the display and the third optical lens, a sixth optical lens is provided on the optical path between the third optical lens and the fourth optical lens, and a seventh optical lens is provided on the optical path between the third optical lens and the first optical lens. The fifth optical lens, the sixth optical lens and the seventh optical lens are all transmissive lenses.

8. The optical display system with a folded optical path according to claim 1, 5 or 6, characterized in that: The radius of curvature of a surface of one side of the fourth optical lens close to the third optical lens is R40, which satisfies: 10 mm ≤ |R40|.

9. The optical display system with a folded optical path according to claim 1, 5 or 6, characterized in that: The angle formed by the optical axis of the third optical lens and the light output path of the display is α, 20°≤α≤70°.

10. The optical display system with a folded optical path according to claim 1, characterized in that: The optical path directions of the third optical lens and the fourth optical lens are consistent with the Z-axis direction, and the optical path direction of the reflected light of the first optical lens is consistent with the X-axis direction.

11. An optical display system with a folded optical path, characterized in that: The device comprises a display, a first optical system component and a second optical system component, wherein the first optical system component is arranged on a light-emitting path of the display, and the second optical system component comprises a first optical lens and a second optical lens, wherein the first optical lens is arranged on a light-emitting path of the first optical system component, and the second optical lens is arranged on a reflected light path of the first optical lens, and an optical axis of the first optical lens forms an angle β with the light-emitting path of the first optical system component, which satisfies 20°≤β≤70°; The first optical system component includes a third optical lens and a fourth optical lens, the third optical lens is arranged on the light output path of the display, the fourth optical lens is arranged on the reflected light path of the third optical lens, the fourth optical lens is a total reflection lens, and the first optical lens is arranged on the transmitted light path of the third optical lens; The distance between the center of the first optical lens and the center of the third optical lens is T1, the distance between the center of the first optical lens and the center of the second optical lens is T2, the distance between the center of the third optical lens and the center of the fourth optical lens is T3, and the distance between the center of the third optical lens and the display is T4, which satisfies: T1=18.0mm, T2=39mm, T3+T4=35mm; The field of view of the optical display system is FOV, which satisfies: FOV=42°; the focal length of the optical display system is f, which satisfies: f=16.60mm; the focal length of the first optical system component is f1, which satisfies: f1=63.348mm; the focal length of the second optical system component is f2, which satisfies: f2=22.472mm; the image height of the optical display system is IMGH, which satisfies: |f1 / IMGH|=4.8, |f2 / IMGH|=1.7, |IMGH / f|=1.3; The optical display system can form a virtual image visible to an observer. In the right-hand rectangular coordinate system O-xyz, the optical display system defines the light path direction of the display as the negative direction of the Z axis. Then, the range in which the human eye can move in the Z direction or the Y direction relative to the optical display system with a folded optical path is EB, which satisfies 5mm≤EB≤25mm; the distance between the human eye and the outermost optical lens in the second optical system component is ER, which satisfies 0.2≤ER / EB≤5; the distance between the virtual image formed by the optical display system with a folded optical path and the human eye is OB, and 0.1m≤OB≤10m.

12. The optical display system with a folded optical path according to claim 11, characterized in that: The first optical lens includes a first lens, a first polarization absorption film, a first polarization reflection film, a first phase delay film and a first anti-reflection film; The first polarizing absorption film is arranged on a side of the first lens close to the first optical system component, the first polarizing reflection film is arranged on a side of the first polarizing absorption film away from the first lens, the first phase delay film is arranged on a side of the first polarizing reflection film away from the first lens, and the number of the first anti-reflection films is two and they are respectively arranged on a side of the first phase delay film away from the first lens and a side of the first lens away from the first polarizing absorption film; Alternatively, the first polarizing absorption film is arranged on a side of the first lens away from the first optical system component, the first polarizing reflection film is arranged on a side of the first lens close to the first optical system component, the first phase delay film is arranged on a side of the first polarizing reflection film away from the first lens, and the number of the first anti-reflection films is two and they are respectively arranged on a side of the first phase delay film away from the first lens and a side of the first polarizing absorption film away from the first lens; Alternatively, the first phase delay film is arranged on the side of the first lens away from the first optical system component, the first polarizing reflective film is arranged on the side of the first phase delay film away from the first lens, the first polarizing absorption film is arranged on the side of the first polarizing reflective film away from the first lens, and the number of the first anti-reflection films is two and they are respectively arranged on the side of the first polarizing absorption film away from the first lens and the side of the first lens away from the first optical system component.

13. The optical display system with a folded optical path according to claim 11, characterized in that: The second optical lens comprises a second lens, a compensation mirror, a second phase delay film, a second linear polarization film, a second partially transmissive and partially reflective film, and a second anti-reflection film; The compensation mirror is arranged on a side of the second lens away from the first optical lens, the second phase delay film is arranged on a side of the compensation mirror away from the second lens, the second linear polarization film is arranged on a side of the second phase delay film away from the second lens, the second anti-reflection film is arranged on a side of the second linear polarization film away from the second lens, and the second partially transmissive and partially reflective film is arranged on a side of the second lens away from the compensation mirror; Alternatively, the second partially transmissive partially reflective film is arranged on the side of the second lens away from the first optical lens, the compensation mirror is arranged on the side of the second partially transmissive partially reflective film away from the first optical lens, the second phase delay film is arranged on the side of the compensation mirror away from the second lens, the second linear polarizing film is arranged on the side of the second phase delay film away from the second lens, and the second anti-reflection film is arranged on the side of the second linear polarizing film away from the second lens.

14. The optical display system with a folded optical path according to claim 13, characterized in that: The curvature radius of the surface of the second lens close to the first optical lens is R211, and the curvature radius of the surface of the second lens away from the first optical lens is R212, which satisfies: |R211|=44.9mm, |R212|=44.9mm.

15. The optical display system with a folded optical path according to claim 11, characterized in that: The third optical lens comprises a third lens, a third polarizing reflective film, a third phase delay film, a fourth phase delay film and a third anti-reflection film; The third polarizing reflective film is arranged on a side of the third lens close to the display, the third phase delay film is arranged on a side of the third polarizing reflective film away from the third lens, the fourth phase delay film is arranged on a side of the third lens away from the display, and the number of the third anti-reflection films is two and they are respectively arranged on a side of the third phase delay film away from the third lens and a side of the fourth phase delay film away from the third lens; Alternatively, the fourth phase retardation film is arranged on a side of the third lens close to the display, the third polarizing reflective film is arranged on a side of the fourth phase retardation film away from the third lens, the third phase retardation film is arranged on a side of the third polarizing reflective film away from the third lens, and the number of the third anti-reflection films is two and they are respectively arranged on a side of the third lens away from the display and a side of the third phase retardation film away from the third lens; Alternatively, the third phase retardation film is arranged on the side of the third lens away from the display, the third polarizing reflective film is arranged on the side of the third phase retardation film away from the third lens, the fourth phase retardation film is arranged on the side of the third polarizing reflective film away from the third lens, and the number of the third anti-reflection films is two and they are respectively arranged on the side of the fourth phase retardation film away from the third lens and on the side of the third lens close to the display.

16. The optical display system with a folded optical path according to claim 11 or 15, characterized in that: An eighth optical lens is arranged on the optical path between the display and the third optical lens, a sixth optical lens is arranged on the optical path between the third optical lens and the fourth optical lens, and a seventh optical lens is arranged on the optical path between the third optical lens and the first optical lens, and both the sixth optical lens and the seventh optical lens are transmissive lenses; The eighth optical lens comprises an eighth lens, an eighth polarizing film, an eighth phase delay film and an eighth anti-reflection film; The eighth phase retardation film is arranged on a side of the eighth lens close to the display, the eighth polarization film is arranged on a side of the eighth phase retardation film away from the eighth lens, and the number of the eighth anti-reflection films is two and they are respectively arranged on a side of the eighth polarization film close to the display and a side of the eighth lens away from the display; Alternatively, the eighth phase retardation film is arranged on a side of the eighth lens away from the display, the eighth polarization film is arranged on a side of the eighth lens close to the display, and the number of the eighth anti-reflection films is two and they are respectively arranged on a side of the eighth polarization film away from the eighth lens and a side of the eighth phase retardation film away from the eighth lens; Alternatively, the eighth polarizing film is arranged on the side of the eighth lens away from the display, the eighth phase retardation film is arranged on the side of the eighth polarizing film away from the eighth lens, and the number of the eighth anti-reflection films is two and they are respectively arranged on the side of the eighth lens close to the display and the side of the eighth phase retardation film away from the eighth lens.

17. The optical display system with a folded optical path according to claim 11 or 15, characterized in that: The radius of curvature of a surface of one side of the fourth optical lens close to the third optical lens is R40, which satisfies: 10 mm ≤ |R40|.

18. The optical display system with a folded optical path according to claim 11 or 15, characterized in that: The angle formed by the optical axis of the third optical lens and the light output path of the display is α, 20°≤α≤70°.

19. The optical display system with a folded optical path according to claim 11, characterized in that: The optical path directions of the third optical lens and the fourth optical lens are consistent with the Z-axis direction, and the optical path direction of the reflected light of the first optical lens is consistent with the X-axis direction.

20. An AR device, characterized in that: It comprises a wearable component and an optical display system with a folded light path as described in any one of claims 1 to 19, wherein the optical display system with a folded light path is arranged on the wearable component.

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