A light and thin optical display system, image lens module and VR device

Abstract

The present invention provides a thin and light optical display system, an imaging lens module and a VR device, belonging to the field of optical imaging technology. The optical display system includes a display and a first optical magnification component and a second optical magnification component sequentially arranged on the light output optical path of the display; the first optical magnification component includes a first optical lens, the radius of curvature of the surface of the first optical lens far from the display is R11, and the radius of curvature of the surface of the first optical lens close to the display is R12, which satisfies -100 < R11 + R12 < 300. The imaging lens module has a small volume, light weight, good imaging quality, a large field of view angle range, and can eliminate most stray light. The VR device is convenient to wear, can be adapted to people with different myopia degrees by adjusting the virtual image distance of the system. When the virtual image distance changes regularly, the ciliary muscles of the user's eyes can also be exercised during repeated focusing, playing a role in protecting the eyes and correcting eyesight.

Description

Technical Field

[0001] The present invention belongs to the field of optical imaging technology, and specifically relates to a light and thin optical display system, an imaging lens module and a VR device. Background Art

[0002] Virtual reality technology (English name: Virtual Reality, abbreviated as VR) is a computer simulation system that can observe, create or experience a virtual world. This technology projects virtual images at a limited distance in front of the user's eyes. Optical display works with environmental modeling, real-time sensing, application system development and system integration to make the wearer feel immersed in the virtual world. Virtual reality technology has been widely used in games, retail, education, industry and other fields.

[0003] At present, traditional VR optical systems generally have problems such as small field of view, small eye movement range, poor image quality, and thick modules, which lead to poor user experience of VR devices. In addition, for myopic users, these optical systems do not support diopter adjustment, which reduces the wearing experience. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a light and thin optical display system with small size, good imaging quality and a wide viewing angle range.

[0005] Another object of an embodiment of the present invention is to provide an imaging lens module which has a small size, light weight, good imaging quality, a large field of view angle, is suitable for myopic users, and can eliminate most stray light.

[0006] Another purpose of the embodiments of the present invention is to provide a VR device that is easy to wear, can exercise the user's eyes, protect the eyes, correct vision, and enhance user experience and immersion.

[0007] The embodiment of the present invention is achieved as follows:

[0008] An embodiment of the present invention provides a light and thin optical display system, comprising a display and a first optical amplifying component and a second optical amplifying component sequentially arranged on a light emitting path of the display, wherein the second optical amplifying component is located on a side of the first optical amplifying component away from the display;

[0009] The first optical magnification assembly includes a first optical lens;

[0010] The curvature radius of the surface of the first optical lens away from the display is R11, and the curvature radius of the surface of the first optical lens close to the display is R12, which satisfies -100 <R11+R12<300。

[0011] The display mainly functions to emit light. The display can display 2D or 3D images or videos, and can be an OLED display, an LCOS display, an LCD display, a micro-LED display, a mini-LED display, etc., which can be selected according to needs.

[0012] Further, the first optical lens includes a first lens, a partially transmissive and partially reflective optical film, and a first anti-reflection optical film. The partially transmissive and partially reflective optical film and the first anti-reflection optical film are respectively disposed on both sides of the first lens.

[0013] The two side surfaces of the first lens can be processed into plane, spherical, aspherical, free-form surface or other surface types according to needs.

[0014] Further, the field of view of the thin and light optical display system is FOV, which satisfies: 60° < FOV < 130°; the focal length of the thin and light optical display system is f, which satisfies: 15mm < f < 45mm; the focal length of the first optical lens is f1, which satisfies: 1 < f1 / f < 6.

[0015] Further, the second optical magnification component includes a second optical lens. The second optical lens is disposed on the transmission light path of the first optical lens. The second optical lens includes a second lens, a second anti-reflection optical film, a second absorption-type linear polarizing film, a second polarization reflection film, and a second phase retardation film; the second absorption-type linear polarizing film is disposed on the side of the second lens close to the first optical lens, the second polarization reflection film is disposed on the side of the second absorption-type linear polarizing film away from the second lens, the second phase retardation film is disposed on the side of the second polarization reflection film away from the second lens, and the second anti-reflection optical films are both disposed on the side of the second phase retardation film away from the second polarization reflection film and on the side of the second lens away from the second absorption-type linear polarizing film; or, the second absorption-type linear polarizing film is disposed on the side of the second lens away from the first optical lens, the second polarization reflection film is disposed on the side of the second lens away from the second absorption-type linear polarizing film, the second phase retardation film is disposed on the side of the second polarization reflection film away from the second lens, and the second anti-reflection optical films are both disposed on the side of the second phase retardation film away from the second polarization reflection film and on the side of the second absorption-type linear polarizing film away from the second lens.

[0016] The two side surfaces of the second lens can be processed into plane, spherical, aspherical, free-form surface or other surface types according to needs.

[0017] Further, the focal length of the second optical lens is f2, which satisfies: 1 < f2 / f < 6; the radius of curvature of the surface of the second optical lens on the side away from the first optical lens is R21, which satisfies: 50 < R21 < 200.

[0018] Further, the second optical magnification component includes a third optical lens and a fourth optical lens. The third optical lens is disposed on the transmission optical path of the first optical lens, and the fourth optical lens is disposed on the transmission optical path of the third optical lens;

[0019] The third optical lens includes a third lens, a third anti-reflection optical film, a third polarization reflection film, and a third phase retardation film. The third polarization reflection film is disposed on the side of the third lens away from the first optical lens, the third phase retardation film is disposed on the side of the third lens close to the first optical lens, and the third anti-reflection optical film is disposed on the side of the third phase retardation film away from the third lens;

[0020] The fourth optical lens includes a fourth lens, a fourth anti-reflection optical film, and a fourth absorption type linear polarization film. The fourth absorption type linear polarization film is disposed on the side of the fourth lens close to the third optical lens, and fourth anti-reflection optical films are provided on both the side of the fourth lens away from the third optical lens and the side of the fourth absorption type linear polarization film away from the fourth lens.

[0021] The two side surfaces of the third lens and the two side surfaces of the fourth lens can be processed into surface types such as plane, spherical surface, aspherical surface, or free form surface according to needs.

[0022] Further, the focal length of the fourth optical lens is f4, which satisfies: 1 < f4 / f < 6; the radius of curvature of the surface of the fourth optical lens on the side away from the first optical lens is R41, which satisfies: 50 < R41 < 200.

[0023] Further, the distance between the optical lens farthest from the display in the second optical magnification component and the display on the optical axis is L, which satisfies 10 mm < L < 30 mm, so as to ensure that the volume of the optical module is small.

[0024] Further, the thickness of the thickest part of any optical lens in the first optical magnification component and the second optical magnification component is MaxT, and the thickness of the thinnest part is MinT, which satisfies: MaxT / MinT < 10.

[0025] Furthermore, the thin and light optical display system can form a virtual image visible to the observer. In the right-handed rectangular coordinate system O-xyz, if the light-emitting optical path direction of the display is defined as the negative Z-axis direction, the range within which the human eye can move relative to the thin and light optical display system in the X or Y direction is EB, which satisfies 4 mm < EB < 15 mm; the distance between the human eye and the outermost optical lens in the second optical magnification component is ER, which satisfies 1 < ER / EB < 2; the distance between the virtual image formed by the thin and light optical display system and the human eye is OB, where 0.1 m < OB < 50 m. The larger EB and ER are, the more guaranteed it is that when the human eye moves within a larger range, a complete and clear display image can be seen.

[0026] Among the above-mentioned optical lenses, the function of the anti-reflection optical film is to improve the transmittance of the optical lens and reduce the influence of stray light on the system; the function of the partially transmissive and partially reflective optical film is to allow some light to pass through the optical lens and some light to be reflected, so as to screen out the required light; the function of the absorption-type linear polarization film is to absorb linearly polarized light in one direction and transmit linearly polarized light in the other direction; the function of the polarization reflection film is to reflect linearly polarized light in one direction and transmit linearly polarized light in the other direction; the phase retardation film is a quarter-wave plate, and its function is to convert circularly polarized light into linearly polarized light or convert linearly polarized light into circularly polarized light.

[0027] Among the optical lenses disclosed in the present invention, the thicknesses of all the absorption-type linear polarization films, polarization reflection films, and phase retardation films are less than 0.2 mm.

[0028] In the present invention, the materials for making the above-mentioned optical lenses can be plastic or glass. The refractive index of the selected material is N, and the dispersion coefficient is V, which satisfy 1.3 < N < 1.8 and 20 < V < 70.

[0029] The aspherical (ASP) curve equations of the above-mentioned lenses are as follows:

[0030]

[0031] In the formula, r is the sagitta of the distance from the aspherical vertex at the position with a height of h along the optical axis direction, c is the curvature of the aspherical surface, that is, c = 1 / R (R is the radius of curvature), k is the conic coefficient, and Ai is the coefficient of the i-th order of the aspherical surface.

[0032] An embodiment of the present invention further provides an imaging lens module, comprising an outer tube, an inner tube and any one of the above-mentioned thin and light optical display systems, wherein the outer tube is a tubular structure with one end open, the display is arranged on the inner bottom surface of the outer tube, the inner tube is a tubular structure with both ends open, the inner tube is arranged in the outer tube, the first optical magnifying assembly and the second optical magnifying assembly are arranged in the inner tube, when any one of the optical lenses in the first optical magnifying assembly and the second optical magnifying assembly is made of plastic, the edge of the optical lens has a glue injection port, and the inner wall of the inner tube is provided with at least one shielding sheet, the shielding sheet is located on the side of the optical lens with the glue injection port and shields the glue injection port of the optical lens.

[0033] An embodiment of the present invention further provides a VR device, comprising a wearable component and the above-mentioned image lens module, wherein the image lens module is arranged on the wearable component.

[0034] The beneficial effects of the present invention are:

[0035] 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.

[0036] The imaging lens module provided by the embodiment of the present invention has a small size, light weight, good imaging quality, a large field of view angle range, and can eliminate most stray light.

[0037] The VR device provided by the embodiment of the present invention is easy to wear and can be adapted to people with different degrees of myopia by adjusting the system virtual image distance. When the system virtual image distance 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 It is a schematic diagram of the optical architecture of the light and thin optical display system according to the first embodiment of the present invention;

[0040] Figure 2 The optical design light path diagram of the first embodiment of the present invention;

[0041] Figure 3 for Figure 2 MTF curve diagram;

[0042] Figure 4 The optical design light path diagram of the second embodiment of the present invention;

[0043] Figure 5 for Figure 4 MTF curve diagram;

[0044] Figure 6 This is a schematic diagram of the optical architecture of a thin and light optical display system according to a third embodiment of the present invention;

[0045] Figure 7 Optical design light path diagram of embodiment 3 of the present invention;

[0046] Figure 8 for Figure 7 MTF curve diagram;

[0047] Fig. 9 Schematic diagram of the structure of an imaging lens module according to a fourth embodiment of the present invention;

[0048] Fig.10 This is a schematic diagram of the structure of a VR device according to Embodiment 5 of the present invention.

[0049] In the figure: 10-display; 20-first optical lens; 201-first lens; 202-first anti-reflection optical film; 203-partially transmissive and partially reflective optical film; 30-second optical lens; 301-second lens; 302-second anti-reflection optical film; 303-second absorptive linear polarization film; 304-second polarization reflection film; 305-second phase delay film; 40-third optical lens; 401-third lens; 402-third polarization reflection film; 403-third phase delay film; 404-third anti-reflection optical film; 50-fourth optical lens; 501-fourth lens; 502-fourth anti-reflection optical film; 503-fourth absorptive linear polarization film; 60-human eye; 70-imaging lens module; 71-outer cylinder; 72-inner cylinder; 721-shielding plate; 80-wearable component. DETAILED DESCRIPTION

[0050] 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.

[0051] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] 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.

[0053] 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.

[0054] Example 1

[0055] refer to Figure 1 As shown, the first embodiment of the present invention provides a light and thin optical display system, including a display 10, a first optical magnifying component and a second optical magnifying component.

[0056] The display 10 mainly emits light. The display 10 can display 2D or 3D images or videos. The display 10 is an LCD display.

[0057] The first optical magnifying component includes a first optical lens 20 , and the first optical lens 20 is arranged on the light output path of the display 10 .

[0058] The first optical lens 20 includes a first lens 201, a first anti-reflection optical film 202, and a partially transmissive and partially reflective optical film 203. The partially transmissive and partially reflective optical film 203 and the first anti-reflection optical film 202 are respectively arranged on both sides of the first lens 201. In this embodiment, the partially transmissive and partially reflective optical film 203 is arranged on a side of the first lens 201 close to the display 10, and the first anti-reflection optical film 202 is arranged on a side of the first lens 201 away from the display 10.

[0059] Both side surfaces of the first lens 201 are aspherical.

[0060] The second optical magnifying assembly includes a second optical lens 30 , which is disposed on the light path of the transmitted light of the first optical lens 20 .

[0061] The second optical lens 30 includes a second lens 301, a second anti-reflection optical film 302, a second absorptive linear polarizing film 303, a second polarizing reflective film 304, and a second phase delay film 305. In this embodiment, the second absorptive linear polarizing film 303 is disposed on a side of the second lens 301 close to the first optical lens 20, the second polarizing reflective film 304 is disposed on a side of the second absorptive linear polarizing film 303 away from the second lens 301, the second phase delay film 305 is disposed on a side of the second polarizing reflective film 304 away from the second lens 301, and the second anti-reflection optical film 302 is disposed on a side of the second phase delay film 305 away from the second polarizing reflective film 304 and a side of the second lens 301 away from the second absorptive linear polarizing film 303. Of course, in another embodiment, the second absorption type linear polarization film 303 is arranged on the side of the second lens 301 away from the first optical lens 20, the second polarization reflective film 304 is arranged on the side of the second lens 301 away from the second absorption type linear polarization film 303, the second phase delay film 305 is arranged on the side of the second polarization reflective film 304 away from the second lens 301, and the second phase delay film 305 on the side away from the second polarization reflective film 304 and the side of the second absorption type linear polarization film 303 away from the second lens 301 are both provided with a second anti-reflection optical film 302.

[0062] The surface of the second lens 301 that is away from the first optical lens 20 is an aspherical surface, and the surface of the second lens 301 that is close to the first optical lens 20 is a plane.

[0063] The field of view FOV of the light and thin optical display system in this embodiment is 70°; and the focal length f is 32.58 mm.

[0064] The focal length of the first optical lens 20 in this embodiment is f1=181.49 mm.

[0065] In this embodiment, the radius of curvature of the surface of the first optical lens 20 on the side away from the display 10 is R11 = 321.78 mm, and the radius of curvature of the surface of the first optical lens 20 on the side close to the display 10 is R12 = -138.30 mm.

[0066] In this embodiment, the focal length f2 of the second optical lens 30 is 159.62 mm; the curvature radius R21 of the side surface of the second optical lens 30 away from the first optical lens 20 is 85.23 mm.

[0067] The distance L between the second optical lens 30 and the display 10 on the optical axis is 20.41 mm.

[0068] The ratio of the thickest thickness to the thinnest thickness of the first optical lens 20 is 2.09; the ratio of the thickest thickness to the thinnest thickness of the second optical lens 30 is 1.89.

[0069] In the right - hand rectangular coordinate system O - xyz of this thin and light optical display system, if the light - emitting optical path direction of the display 10 is defined as the negative Z - axis direction, then the range within which the human eye 60 can move relative to this thin and light optical display system in the X - direction or Y - direction is EB (Eye Box), and it satisfies 4mm < EB < 15mm; the distance between the human eye 60 and the outermost optical lens in the second optical magnification component is ER (Eye Relief), and it satisfies 1 < ER / EB < 2; the adjustable distance between the virtual image formed by this thin and light optical display system and the human eye 60 is OB, and 0.1m < OB < 50m. The larger EB and ER are, the more guaranteed it is that when the human eye 60 moves within a larger range, a complete and clear display picture can be seen.

[0070] For the detailed parameters of each optical structure in this embodiment, please refer to Table 1 and Table 2.

[0071] Table 1

[0072]

[0073]

[0074]

[0075] Table 2

[0076]

[0077] Table 1 shows the relevant optical structure data of Embodiment 1. Because in the optical design software, the optical path is designed in the reverse direction, the surfaces S0 to S29 represent the surfaces that the light passes through in sequence from the virtual image position to the display 10. Among them, the thickness represents the distance that the light travels from this surface to the next surface, 0 means that the two surfaces are in contact, and a negative value means that the light is reflected at this surface; in the table, mirror means that the light is reflected at this surface; the optical film layers not shown in the table are all conventional optical coatings using processes such as evaporation or sputtering in the optical field. The influence brought by such optical film layers in optical software design is small and generally not considered, so it is not shown in the table.

[0078] Table 2 shows the aspherical data of the relevant optical structures in Embodiment 1, where k is the conic coefficient in the above - mentioned curve equation, and A4 to A20 represent the 4th to 20th order aspherical coefficients of each surface.

[0079] Figure 2 This is the optical design optical path diagram of this embodiment.

[0080] Figure 3 is Figure 2MTF curve, 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.

[0081] The imaging principle of the light and thin optical display system of this embodiment is as follows:

[0082] The circularly polarized light emitted by the display 10 first enters the first optical lens 20, is transmitted out after being processed by the first optical lens 20, and then enters the second optical lens 30. The circularly polarized light becomes the first polarized light after passing through the second anti-reflection optical film 302 and the second phase delay film 305 in the second optical lens 30. The first polarized light is reflected at the second polarizing reflective film 304 layer in the second optical lens 30, and then becomes the circularly polarized light after passing through the second phase delay film 305 in the second optical lens 30 again, is reflected from the second anti-reflection optical film 302, and enters the first optical lens 20. Part of the light is reflected at the partially transmitting and partially reflecting optical film 203 in the first optical lens 20, passes through the first optical lens 20 again, and then enters the second optical lens 30. After passing through the second phase delay film 305 of the second optical lens 30, it becomes the second polarized light. The second polarized light passes through the second polarizing reflective film 304, the second absorptive linear polarization film 303, the second lens 301, and the second anti-reflection optical film 302 in sequence and reaches the human eye 60 to form a virtual image with a specific imaging position and a specific magnification. The second absorption type linear polarization film 303 can eliminate the stray light formed by the ambient light on the side of the human eye 60 being reflected by the polarization reflection film.

[0083] It should be noted that, if the first polarized light is S polarized light, the second polarized light is P polarized light; if the first polarized light is P polarized light, the second polarized light is S polarized light.

[0084] 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. According to different requirements in actual use, an aberration correction lens can be added between the first optical lens 20 and the second optical lens 30. The aberration correction lens is at least one piece, which can be a plane, a spherical surface, an aspherical surface or a free-form surface. The optical surface of the aberration correction lens can be anti-reflection coated. By adding an aberration correction lens, the image quality can be further improved, the eye movement range can be increased, and the field curvature, chromatic aberration and distortion can be controlled; at the same time, the position of the virtual image can also be controlled.

[0085] Example 2

[0086] refer to Figure 1As shown, the second embodiment of the present invention provides a light and thin optical display system, including a display 10, a first optical magnifying component and a second optical magnifying component.

[0087] It should be noted that the structures and working principles of the display 10, the first optical amplifying assembly and the second optical amplifying assembly in this embodiment are the same as those in the first embodiment. Please refer to the corresponding contents in the first embodiment and will not be repeated here.

[0088] The difference between this embodiment and the first embodiment lies in the design of optical parameters.

[0089] In this embodiment, the field of view FOV of the light and thin optical display system is 120°; and the focal length f is 21.86 mm.

[0090] The focal length of the first optical lens 20 in this embodiment is f1=89.59 mm.

[0091] In this embodiment, the radius of curvature of the surface of the first optical lens 20 on the side away from the display 10 is R11=84.06 mm, and the radius of curvature of the surface of the first optical lens 20 on the side close to the display 10 is R12=-115.24 mm.

[0092] In this embodiment, the focal length f2 of the second optical lens 30 is 236.76 mm; the curvature radius R21 of the side surface of the second optical lens 30 away from the first optical lens 20 is 126.42.

[0093] The distance L between the second optical lens 30 and the display 10 on the optical axis is 20.45 mm.

[0094] The ratio of the thickest thickness to the thinnest thickness of the first optical lens 20 is 3; the ratio of the thickest thickness to the thinnest thickness of the second optical lens 30 is 3.05.

[0095] For detailed parameters of each optical structure in this embodiment, please refer to Table 3 and Table 4.

[0096] Table 3

[0097]

[0098]

[0099] Table 4

[0100]

[0101] Table 3 shows the relevant optical structure data of the second embodiment. Because the optical path is designed in reverse in the optical design software, the surfaces S0 to S29 represent the surfaces that the light passes through in sequence from the virtual image position to the display 10. 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; the mirror in the table represents that the light is reflected on the surface; the optical film layers not shown in the table are all conventional optical coatings in the optical field using evaporation or sputtering process means. The impact of such optical film layers in the optical software design is small and generally not considered, so it is not reflected in the table.

[0102] 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 A20 represent the 4th to 20th order aspheric surface coefficients of each surface.

[0103] Figure 4 This is the optical design light path diagram of this embodiment.

[0104] Figure 5 for Figure 4 MTF curve, 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.

[0105] Example 3

[0106] refer to Figure 6 As shown, the third embodiment of the present invention provides a light and thin optical display system, including a display 10, a first optical magnifying component and a second optical magnifying component.

[0107] The display 10 mainly emits light. The display 10 can display 2D or 3D images or videos. The display 10 is an LCD display.

[0108] The first optical magnifying component includes a first optical lens 20 , and the first optical lens 20 is arranged on the light output path of the display 10 .

[0109] The first optical lens 20 includes a first lens 201, a partially transmissive and partially reflective optical film 203, and a first anti-reflective optical film 202, wherein the partially transmissive and partially reflective optical film 203 and the first anti-reflective optical film 202 are respectively disposed on both sides of the first lens 201. In this embodiment, the partially transmissive and partially reflective optical film 203 is disposed on a side of the first lens 201 close to the display 10, and the first anti-reflective optical film 202 is disposed on a side of the first lens 201 away from the display 10.

[0110] Both side surfaces of the first lens 201 are aspherical.

[0111] The second optical magnifying assembly includes a third optical lens 40 and a fourth optical lens 50, wherein the third optical lens 40 is disposed on the light path of the transmitted light of the first optical lens 20, and the fourth optical lens 50 is disposed on the light path of the transmitted light of the third optical lens 40;

[0112] The third optical lens 40 includes a third lens 401, a third anti-reflection optical film 404, a third polarized reflective film 402 and a third phase delay film 403. The third polarized reflective film 402 is arranged on a side of the third lens 401 away from the first optical lens 20, the third phase delay film 403 is arranged on a side of the third lens 401 close to the first optical lens 20, and the third anti-reflection optical film 404 is arranged on a side of the third phase delay film 403 away from the third lens 401.

[0113] Both side surfaces of the third lens 401 are planes.

[0114] The fourth optical lens 50 includes a fourth lens 501, a fourth anti-reflection optical film 502 and a fourth absorptive linear polarization film 503. The fourth absorptive linear polarization film 503 is arranged on a side of the fourth lens 501 close to the third optical lens 40. The fourth anti-reflection optical film 502 is provided on a side of the fourth lens 501 away from the third optical lens 40 and on a side of the fourth absorptive linear polarization film 503 away from the fourth lens 501.

[0115] The surface of the fourth lens 501 that is away from the third optical lens 40 is aspherical, and the surface of the fourth lens 501 that is close to the third optical lens 40 is flat.

[0116] The field of view FOV of the light and thin optical display system in this embodiment is 100°; and the focal length f is 24.75 mm.

[0117] The focal length of the first optical lens 20 in this embodiment is f1=114.13 mm.

[0118] In this embodiment, the radius of curvature of the surface of the first optical lens 20 away from the display 10 is R11 = 130.77 mm, and the radius of curvature of the surface of the first optical lens 20 close to the display 10 is R12 = -118.23 mm.

[0119] In this embodiment, the focal length f4 of the fourth optical lens 50 is 147.75 mm; the radius of curvature R41 of the surface of the fourth optical lens 50 away from the first optical lens 20 is 80.51 mm.

[0120] The distance L between the fourth optical lens 50 and the display 10 on the optical axis is 20.15 mm.

[0121] The ratio of the thickest thickness to the thinnest thickness of the first optical lens 20 is 2.17; the ratio of the thickest thickness to the thinnest thickness of the fourth optical lens 50 is 1.69.

[0122] In the right-handed rectangular coordinate system O-xyz of this thin and light optical display system, if the light-emitting optical path direction of the display 10 is defined as the negative Z-axis direction, the range within which the human eye 60 can move relative to this thin and light optical display system in the X direction or the Y direction is EB (Eye Box), which satisfies 4 mm < EB < 15 mm; the distance between the human eye 60 and the outermost optical lens in the second optical magnification component is ER (Eye Relief), which satisfies 1 < ER / EB < 2; the adjustable distance between the virtual image formed by this thin and light optical display system and the human eye 60 is OB, 0.1 m < OB < 50 m. The larger EB and ER are, the more guaranteed it is that when the human eye 60 moves within a larger range, a complete and clear display image can be seen.

[0123] For the detailed parameters of each optical structure in this embodiment, refer to Table 5 and Table 6.

[0124] Table 5

[0125]

[0126]

[0127]

[0128] Table 6

[0129]

[0130] Table 5 shows the relevant optical structure data of the third embodiment. Because the optical path is designed in reverse in the optical design software, the surfaces S0 to S37 represent the surfaces that the light passes through in sequence from the virtual image position to the display 10. 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; the mirror in the table represents that the light is reflected on the surface; the optical film layers not shown in the table are all conventional optical coatings in the optical field using evaporation or sputtering process means. The impact of such optical film layers in the optical software design is small and generally not considered, so it is not reflected in the table.

[0131] 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 A20 represent the 4th to 20th order aspheric surface coefficients of each surface.

[0132] Figure 7 This is the optical design light path diagram of this embodiment.

[0133] Figure 8 for Figure 7 MTF curve, 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.

[0134] The imaging principle of the light and thin optical display system of this embodiment is as follows:

[0135] The circularly polarized light emitted by the display 10 first enters the first optical lens 20, is transmitted after being processed by the first optical lens 20, and then enters the third optical lens 40. The circularly polarized light becomes the first polarized light after passing through the third anti-reflection optical film 404 and the third phase delay film 403 in the third optical lens 40. The first polarized light passes through the third lens 401 to reach the third polarizing reflective film 402 layer. The first polarized light is reflected at the third polarizing reflective film 402 layer in the third optical lens 40, and then passes through the third lens 401 in the third optical lens 40 again to enter the third phase delay film 403 and becomes the circularly polarized light. After passing through the third anti-reflection optical film 404 and the third phase delay film 403 in the third optical lens 40, the first polarized light passes through the third lens 401 to reach the third polarizing reflective film 402 layer in the third optical lens 40. The light passes through the optical film 404 and enters the first optical lens 20. Part of the light is reflected at the partially transmissive and partially reflective optical film 203 in the first optical lens 20 and enters the third optical lens 40. After passing through the third phase delay film 403 of the third optical lens 40, it becomes the second polarized light. The second polarized light passes through the third lens 401 and the third polarized reflective film 402 in sequence and then enters the fourth optical lens 50. The light entering the fourth optical lens 50 passes through the fourth absorptive linear polarizing film 503, the fourth lens 501 and the fourth anti-reflection optical film 502 in sequence and then reaches the human eye 60 to form a virtual image of a specific imaging position and a specific magnification. The fourth absorptive linear polarizing film 503 can eliminate the stray light formed by the ambient light on the side of the human eye 60 being reflected by the polarized reflective film.

[0136] It should be noted that, if the first polarized light is S polarized light, the second polarized light is P polarized light; if the first polarized light is P polarized light, the second polarized light is S polarized light.

[0137] 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.

[0138] The optical display system of this embodiment improves the system freedom, and the third optical lens is a plane, which can reduce the process difficulty, improve the module yield, and save costs. Similarly, in this optical architecture, according to the performance requirements of the system, an aberration correction lens can be further added to further improve the image quality, increase the eye movement range, control chromatic aberration, distortion and the position of the virtual image.

[0139] Example 4

[0140] refer to Fig. 9 As shown, the fourth embodiment of the present invention provides an imaging lens module 70, including an outer cylinder 71, an inner cylinder 72 and an optical display system.

[0141] It should be noted that the optical display system in this embodiment can adopt the thin and light optical display system 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.

[0142] The optical display system in this embodiment is described using the light and thin optical display system in Embodiment 1. The optical display system includes a display 10, a first optical magnifying assembly and a second optical magnifying assembly. The first optical magnifying assembly includes a first optical lens 20, and the second optical magnifying assembly includes a second optical lens 30.

[0143] The outer cylinder 71 is a cylindrical structure with one end open, and the display 10 is arranged on the inner bottom surface of the outer cylinder 71. The inner cylinder 72 is a cylindrical structure with two ends open. The inner cylinder 72 is arranged in the outer cylinder 71. The inner cylinder 72 and the outer cylinder 71 can move relative to each other in the axial direction. The first optical lens 20 and the second optical lens 30 are arranged in the inner cylinder 72. When any one of the first optical lens 20 and the second optical lens 30 is made of plastic, the edge of the optical lens has a glue injection port, and the inner wall of the inner cylinder 72 is provided with at least one shielding sheet 721, which is located on the side of the optical lens with the glue injection port and blocks the glue injection port of the optical lens.

[0144] In this way, the shielding plate 721 can shield the stress-affected area at the glue injection port of the optical lens, thereby preventing the polarization state of the light passing near the glue injection port from changing, causing part of the light in the polarized folding light path to not be reflected due to the change in polarization state but to pass through the polarized reflective film and the linear polarization film directly to emit, generating stray light. The setting of the shielding plate 721 can better ensure the good imaging quality of the system and enhance the user experience.

[0145] Example 5

[0146] refer to Fig.10 As shown, a fifth embodiment of the present invention provides a VR device, including a wearable component 80 and an image lens module 70.

[0147] It should be noted that the image lens module 70 in this embodiment can adopt the image lens module 70 in Example 4. Its structure, working principle and technical effects produced refer to the corresponding contents in Example 4 and are not repeated here.

[0148] The image lens module 70 is arranged on the wearable component 80. The wearable component 80 can be a helmet or a glasses frame, etc., so that people can wear it on their heads. Of course, the VR 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.

[0149] When in use, the distance between the optical lenses is adjusted manually or electrically, or the distance between the lens and the display screen is 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.

[0150] 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. A thin and light optical display system, characterized in that: It comprises a display, and a first optical amplifying component and a second optical amplifying component which are sequentially arranged on a light-emitting optical path of the display, wherein the second optical amplifying component is located on a side of the first optical amplifying component away from the display; The first optical magnification assembly includes a first optical lens; The curvature radius of the surface of the first optical lens away from the display is R11, and the curvature radius of the surface of the first optical lens close to the display is R12, which satisfies: R11=321.78mm, R12=-138.30mm, or R11=84.06mm, R12=-115.24mm; The field of view of the thin and light optical display system is FOV, which satisfies: FOV is 70° or 120°; the focal length of the thin and light optical display system is f, which satisfies: f is 32.58 mm or 21.86 mm; the focal length of the first optical lens is f1, which satisfies: f1 is 181.49 mm or 89.59 mm; The second optical amplification component comprises a second optical lens, which is arranged on the light path of the transmitted light of the first optical lens, and the second optical lens comprises a second lens, a second anti-reflection optical film, a second absorbing linear polarization film, a second polarization reflective film and a second phase delay film; the second absorbing linear polarization film is arranged on a side of the second lens close to the first optical lens, the second polarization reflective film is arranged on a side of the second absorbing linear polarization film away from the second lens, the second phase delay film is arranged on a side of the second polarization reflective film away from the second lens, and the second anti-reflection optical film is provided on both the side of the second phase delay film away from the second polarization reflective film and the side of the second lens away from the second absorbing linear polarization film; or the second absorbing linear polarization film is arranged on a side of the second lens away from the first optical lens, the second polarization reflective film is arranged on a side of the second lens away from the second absorbing linear polarization film, the second phase delay film is arranged on a side of the second polarization reflective film away from the second lens, and the second anti-reflection optical film is provided on both the side of the second phase delay film away from the second polarization reflective film and the side of the second absorbing linear polarization film away from the second lens; The focal length of the second optical lens is f2, which satisfies: f2 is 159.62 mm or 236.76 mm; the radius of curvature of the surface of the second optical lens away from the first optical lens is R21, which satisfies: R21 is 85.23 mm or 126.42 mm.

2. The light and thin optical display system according to claim 1, characterized in that: The first optical lens includes a first lens, a partially transmissive and partially reflective optical film and a first anti-reflection optical film, and the partially transmissive and partially reflective optical film and the first anti-reflection optical film are respectively arranged on both sides of the first lens.

3. The light and thin optical display system according to claim 1 or 2, characterized in that: The distance between the optical lens farthest from the display in the second optical magnification assembly and the display on the optical axis is L, which satisfies 10mm <L<30mm。 4. The light and thin optical display system according to claim 1 or 2, characterized in that: The thickness of the thickest part of any one of the optical lenses in the first optical magnification component and the second optical magnification component is MaxT, and the thickness of the thinnest part is MinT, which satisfies: MaxT / MinT < 10.

5. The light and thin optical display system according to claim 1 or 2, characterized in that: The thin and light optical display system can form a virtual image visible to the observer. In the right-handed rectangular coordinate system O-xyz, if the light output optical path direction of the display is defined as the negative Z-axis direction, then the range within which the human eye can move relative to the thin and light optical display system in the X direction or the Y direction is EB, which satisfies 4 mm < EB < 15 mm; the distance between the human eye and the outermost optical lens in the second optical magnification component is ER, which satisfies 1 < ER / EB < 2; the distance between the virtual image formed by the thin and light optical display system and the human eye is OB, and 0.1 m < OB < 50 m.

6. A light and thin optical display system, characterized in that: It includes a display, and a first optical magnification component and a second optical magnification component that are sequentially arranged on the light output optical path of the display. The second optical magnification component is located on the side of the first optical magnification component away from the display. The first optical magnification component includes a first optical lens. The radius of curvature of the surface of the first optical lens away from the display is R11, and the radius of curvature of the surface of the first optical lens close to the display is R12, which satisfies: R11 = 130.77 mm, R12 = -118.23 mm. The field of view angle of the thin and light optical display system is FOV, which satisfies: FOV = 100°; the focal length of the thin and light optical display system is f, which satisfies: f = 24.75 mm; the focal length of the first optical lens is f1, which satisfies: f1 = 114.13 mm. The second optical magnification component includes a third optical lens and a fourth optical lens. The third optical lens is arranged on the transmitted light optical path of the first optical lens, and the fourth optical lens is arranged on the transmitted light optical path of the third optical lens. The third optical lens includes a third lens, a third anti-reflection optical film, a third polarization reflection film, and a third phase retardation film. The third polarization reflection film is arranged on the side of the third lens away from the first optical lens, the third phase retardation film is arranged on the side of the third lens close to the first optical lens, and the third anti-reflection optical film is arranged on the side of the third phase retardation film away from the third lens. The fourth optical lens includes a fourth lens, a fourth anti-reflection optical film, and a fourth absorption type linear polarization film. The fourth absorption type linear polarization film is arranged on the side of the fourth lens close to the third optical lens, and fourth anti-reflection optical films are provided on both the side of the fourth lens away from the third optical lens and the side of the fourth absorption type linear polarization film away from the fourth lens. The focal length of the fourth optical lens is f4, which satisfies: f4 = 147.75 mm; the radius of curvature of the surface of the fourth optical lens away from the first optical lens is R41, which satisfies: R41 = 80.51 mm.

7. The light and thin optical display system according to claim 6, characterized in that: The first optical lens includes a first lens, a partially transmissive and partially reflective optical film, and a first anti-reflection optical film. The partially transmissive and partially reflective optical film and the first anti-reflection optical film are respectively disposed on two sides of the first lens.

8. The light and thin optical display system according to claim 6 or 7, characterized in that: The distance between the optical lens farthest from the display in the second optical magnification component and the display on the optical axis is L, which satisfies 10 mm < L < 30 mm.

9. The light and thin optical display system according to claim 6 or 7, characterized in that: The thickness of the thickest part of any optical lens in the first optical magnification component and the second optical magnification component is MaxT, and the thickness of the thinnest part is MinT, which satisfies: MaxT / MinT < 10.

10. The light and thin optical display system according to claim 6 or 7, characterized in that: The thin and light optical display system can form a virtual image visible to an observer. In the right-handed rectangular coordinate system O-xyz of the thin and light optical display system, if the light output optical path direction of the display is defined as the negative Z-axis direction, the range within which the human eye can move relative to the thin and light optical display system in the X direction or the Y direction is EB, which satisfies 4 mm < EB < 15 mm; the distance between the human eye and the outermost optical lens in the second optical magnification component is ER, which satisfies 1 < ER / EB < 2; the distance between the virtual image formed by the thin and light optical display system and the human eye is OB, 0.1 m < OB < 50 m.

11. An imaging lens module, characterized in that It includes an outer cylinder, an inner cylinder, and the thin and light optical display system according to any one of claims 1-10. The outer cylinder is a cylindrical structure with one end open. The display is disposed on the inner bottom surface of the outer cylinder. The inner cylinder is a cylindrical structure with both ends open. The inner cylinder is disposed inside the outer cylinder. The first optical magnification component and the second optical magnification component are disposed inside the inner cylinder. When any optical lens in the first optical magnification component and the second optical magnification component is made of plastic, the edge part of the optical lens has a glue injection port. At least one shielding piece is provided on the inner wall of the inner cylinder. The shielding piece is located on the side of the optical lens with the glue injection port and shields the glue injection port of the optical lens.

12. A VR device, characterized in that: It includes a wearing component and the imaging lens module according to claim 11. The imaging lens module is disposed on the wearing component.

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