Near-eye optical system and head-mounted display device

Abstract

A near-eye optical system and a head-mounted display device. The near-eye optical system comprises a lens barrel (9) and a first optical element provided in the lens barrel (9). The first optical element comprises at least a first lens (5), a polarization-reflection element (10), a phase retarder (11) and a light splitting element (12), one surface of the first lens (5) being circularly provided with a light shielding element (7). The lens barrel (9) comprises a first bearing section (91), a second bearing section (92), and a transition section (93) connected between the first bearing section (91) and the second bearing section (92); the first optical element is arranged at the first bearing section (91); and the transition section (93) forms a target included angle θ1 with respect to the optical axis of the near-eye optical system, wherein θ1<90°. The near-eye optical system satisfies tan(θ1)*(T1-L1+L5)≤50, where T1 is the total optical length of the near-eye optical system, L1 is the distance between a point A and the center point O of the surface on the side of the first lens (5) provided with the light shielding element (7), the point A is an orthographic projection point of a connection point of the transition section (93) and the second bearing section (92) on the optical axis of the near-eye display system, and L5 is the length of the transition section (93).

Description

Near-eye optical systems and head-mounted display devices Technical Field

[0001] The embodiments of the present application relate to the field of optical display technology, and more specifically, to a near-eye optical system and a head-mounted display device. Background Art

[0002] In existing VR optical solutions, the field of view (FOV) of the optical system is generally positively correlated with its volume. That is, the larger the FOV, the larger the optical system. In VR product design, maintaining a wide FOV often sacrifices the volume of the optical system, resulting in a larger optical system and, consequently, a reduced VR product size. This runs counter to the current trend toward smaller, lighter, and thinner VR optical solutions.

[0003] Summary of the Invention

[0004] The purpose of this application is to provide a new technical solution for a near-eye optical system and a head-mounted display device, which can achieve a small-volume design of the near-eye optical system under a large field of view.

[0005] In a first aspect, the present application provides a near-eye optical system. The near-eye optical system includes a lens barrel and a first optical element disposed in the lens barrel;

[0006] The first optical element includes at least a first lens, a polarization reflection element, a phase retarder, and a beam splitter, and a light shielding element is provided on one surface of the first lens;

[0007] The lens barrel includes a first supporting section, a second supporting section, and a transition section connected between the first supporting section and the second supporting section; the first optical element is disposed in the first supporting section, and the transition section forms a target angle θ1 with respect to the optical axis of the near-eye optical system, and θ1 is less than 90°;

[0008] The near-eye optical system satisfies: tan(θ1)*(T1-L1+L5)≤50, wherein T1 is the total optical length of the near-eye optical system, L1 is the distance from the center point O of the surface of the first lens on the side where the shading element is provided to point A, and point A is the orthographic projection point of the connection point between the transition section and the second bearing section on the optical axis of the near-eye display system, and L5 is the length of the transition section.

[0009] Optionally, the shading element is a shading ring, and the inner edge of the shading element has a first sharp angle structure;

[0010] The angle of the first pointed structure is θ2, and abs(θ2)≥5°.

[0011] Optionally, the near-eye optical system includes a display, and the display is connected to an end of the second bearing section away from the transition section via a bracket;

[0012] The shading element is located at an edge region of a surface of the first lens facing away from the display.

[0013] Optionally, the stent includes a main body section and an extension section connected to the main body section;

[0014] The extension section is connected to the second bearing section, and the main section forms a set angle θ3 with the optical axis, and θ3 is less than 90°.

[0015] The display is arranged at one end of the main body section away from the extension section.

[0016] Optionally, the near-eye optical system further includes a second optical element, which is disposed in the second bearing section of the lens barrel and is located on the same optical axis as the first optical element;

[0017] The second optical element includes at least one lens.

[0018] Optionally, the second optical element includes at least a third lens;

[0019] The extension section of the bracket is arranged around the edge area of ​​the surface of the third lens close to the display;

[0020] A second extension segment is formed at a connection point between the transition segment and the second bearing segment, and the second extension segment is arranged around an edge area of ​​the surface of the third lens away from the display.

[0021] Optionally, the display is configured to emit natural light or circularly polarized light;

[0022] When the light emitted by the display is natural light, a composite film is provided on the light-emitting surface of the display. The composite film includes two phase retarders and a polarizer provided between the two phase retarders, and can be used to convert natural light into circularly polarized light.

[0023] Optionally, the light splitting element is arranged on a surface of the first lens close to the display;

[0024] The phase retarder and the polarized reflective element are stacked and disposed on a surface of the first lens away from the display.

[0025] Optionally, the first optical element further includes a polarizing element, and the polarizing element, the polarizing reflecting element and the phase retarder are stacked to form a stacked element, and the polarizing reflecting element is located between the polarizing element and the phase retarder.

[0026] Optionally, the first optical element further includes a second lens, and the second lens is arranged on a side of the first lens away from the shading element;

[0027] A spacer element is provided between the first lens and the second lens, and the spacer element is disposed between an edge region of the first lens and an edge region of the second lens.

[0028] Optionally, a first extension segment is formed at a connection point B between the transition segment and the first bearing segment, and the first extension segment is arranged around an edge area of ​​the surface of the second lens close to the display.

[0029] Optionally, the near-eye optical system satisfies: (L2+L4) / L3≥5, L2 is the thickness of the edge area of ​​the first lens, L4 is the thickness of the edge area of ​​the second lens, and L3 is the thickness of the spacer element.

[0030] Optionally, the spacer element is an annular structure, and the inner edge of the spacer element has a second sharp angle structure;

[0031] The angle of the second pointed structure is θ4, and abs(θ4)≥5°.

[0032] Optionally, when the thickness L3 of the spacer element is less than or equal to 0.1 mm, the spacer element is an opaque Mylar sheet.

[0033] Optionally, the display is configured to emit natural light or circularly polarized light;

[0034] When the light emitted by the display is natural light, a composite film is provided on the surface of the third lens away from the display. The composite film includes two phase retarders and a polarizer provided between the two phase retarders, which can be used to convert natural light into circularly polarized light.

[0035] Optionally, the light splitting element is arranged on a surface of the second lens close to the display;

[0036] The phase retarder and the polarized reflective element are stacked and disposed on a surface of the first lens close to the display.

[0037] Optionally, the first optical element further includes a polarizing element, and the polarizing element, the polarizing reflecting element and the phase retarder are stacked to form a stacked element, and the polarizing reflecting element is located between the polarizing element and the phase retarder.

[0038] In a second aspect, the present application provides a head-mounted display device. The head-mounted display device includes:

[0039] a housing; and

[0040] The near-eye optical system as described in the first aspect.

[0041] The beneficial effects of this application are:

[0042] The near-eye optical system provided by the embodiments of the present application is an optical architecture based on a folded optical path. By rationally constraining optical parameters and adding a light-shielding element to block stray light, this new optical architecture achieves a virtual reality solution with a large field of view and a compact size, while also ensuring excellent imaging quality. The near-eye optical system provided by the embodiments of the present application has excellent optical performance.

[0043] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0045] FIG1 is a schematic diagram of a near-eye optical system according to an embodiment of the present invention;

[0046] FIG2 is a point array diagram of the near-eye optical system provided in FIG1 ;

[0047] FIG3 is a diagram of the modulation transfer function (MTF) of the near-eye optical system provided in FIG1 ;

[0048] FIG4 is a diagram of field curvature and distortion of the near-eye optical system provided in FIG1 ;

[0049] FIG5 is a diagram of vertical chromatic aberration of the near-eye optical system provided in FIG1 ;

[0050] FIG6 is a second structural diagram of the near-eye optical system provided in an embodiment of the present application;

[0051] FIG7 is a schematic diagram of an embodiment of introducing an optical element forming a folded optical path in a near-eye optical system;

[0052] FIG8 is a schematic diagram of an embodiment of introducing a superimposed element into a near-eye optical system;

[0053] FIG9 is a schematic diagram of a partial structure of a lens barrel according to an embodiment of the present application;

[0054] FIG10 is a schematic diagram of a partial structure of a first optical element provided in an embodiment of the present application;

[0055] FIG11 is a second schematic diagram of a partial structure of a lens barrel provided in an embodiment of the present application;

[0056] FIG12 is a point array diagram of the near-eye optical system provided in FIG6 ;

[0057] FIG13 is a diagram of the modulation transfer function (MTF) of the near-eye optical system provided in FIG6 ;

[0058] FIG14 is a diagram of field curvature and distortion of the near-eye optical system provided in FIG6 ;

[0059] FIG15 is a diagram of vertical chromatic aberration of the near-eye optical system provided in FIG6 ;

[0060] FIG16 is a third structural diagram of the near-eye optical system provided in an embodiment of the present application;

[0061] FIG17 is a dot array diagram of the near-eye optical system provided in FIG16 ;

[0062] FIG18 is a diagram of the modulation transfer function (MTF) of the near-eye optical system provided in FIG16 ;

[0063] FIG19 is a diagram of field curvature and distortion of the near-eye optical system provided in FIG16 ;

[0064] FIG20 is a diagram of vertical chromatic aberration of the near-eye optical system provided in FIG16 ;

[0065] FIG21 is a fourth structural diagram of the near-eye optical system provided in an embodiment of the present application;

[0066] FIG22 is a dot array diagram of the near-eye optical system provided in FIG21 ;

[0067] FIG23 is a diagram of the modulation transfer function (MTF) of the near-eye optical system provided in FIG21 ;

[0068] FIG24 is a diagram of field curvature and distortion of the near-eye optical system provided in FIG21 ;

[0069] FIG25 is a diagram of vertical axis chromatic aberration of the near-eye optical system provided in FIG21 .

[0070] Explanation of the accompanying drawings: 1. Display; 2. Bracket; 21. Main section; 22. Extension section; 3. Third lens; 31. Fifth surface; 32. Sixth surface; 4. Second lens; 41. Third surface; 42. Fourth surface; 5. First lens; 51. First surface; 52. Second surface; 6. Human eye; 7. Shading element; 71. First sharp-angle structure; 8. Spacer element; 9. Lens barrel; 91. First supporting section; 92. Second supporting section; 93. Transition section; 94. First extension section; 95. Second extension section; 10. Polarization reflection element; 11. Phase retarder; 12. Spectral element; 13. Polarization element; 14. First anti-reflection film; 15. Phase retarder; 16. Polarizer; 17. Second anti-reflection film; 18. Screen protection element. DETAILED DESCRIPTION

[0071] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0072] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0073] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0074] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0075] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0076] The near-eye optical system and head-mounted display device provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0077] According to one aspect of an embodiment of the present application, a near-eye optical system is provided. The near-eye optical system can be used in a virtual reality display device, such as a VR head-mounted display device. Specifically, the VR head-mounted display device includes VR smart glasses or a VR smart helmet, etc. The specific form of the head-mounted display device is not limited in the embodiments of the present application.

[0078] The near-eye optical system proposed in the embodiments of the present application, as shown in Figures 1 and 6, includes a lens barrel 9 and a first optical element disposed within the lens barrel 9. The first optical element includes at least a first lens 5, a polarizing reflective element 10, a phase retarder 11, and a beam splitter 12. A light-shielding element 7 is provided around one surface of the first lens 5. The lens barrel 9 includes a first supporting section 91, a second supporting section 92, and a transition section 93 connected between the first supporting section 91 and the second supporting section 92. The first optical element is disposed within the first supporting section 91, and the transition section 93 forms a target angle θ1 with respect to the optical axis of the near-eye optical system, where θ1 is less than 90°. The near-eye optical system satisfies: tan(θ1)*(T1-L1+L5)≤50, wherein T1 is the total optical length of the near-eye optical system, L1 is the distance from the surface center point O of the first lens 5 on the side where the shading element 7 is provided to point A, and point A is the orthographic projection point of the connection point between the transition section 93 and the second bearing section 92 on the optical axis of the near-eye display system, and L5 is the length of the transition section 93, see Figure 9.

[0079] According to the near-eye optical system provided by the above embodiment, the surface of the first lens 5 on which the shading element 7 is provided can be a plane or a convex surface, referring to FIG. 1 and FIG. 6 , and the surface can be close to the human eye 6 .

[0080] The near-eye optical system provided in the above embodiment includes a lens barrel 9, which is used to support the main optical components within the near-eye optical system. Referring to Figure 9 , the lens barrel 9 is not a straight cylindrical structure, but rather has a sloping wall structure. The introduction of the lens barrel 9 facilitates the assembly of the entire near-eye optical system, such as in VR products.

[0081] According to the near-eye optical system provided by the above embodiment, a first optical element is provided in the lens barrel 9, which can be used to receive light for imaging display emitted by an external device such as a display 1, and transmit the light to an imaging position, such as the position of the human eye 6 shown in Figures 1 and 6 to form an image.

[0082] The first optical element includes at least one lens, namely the aforementioned first lens 5, and multiple optical elements that form a folded optical path, such as the aforementioned polarizing reflector 10, phase retarder 11, and beam splitter 12, allowing light to be folded back within the first optical element. The folded optical path design can reduce the total optical length of the near-eye optical system while ensuring imaging quality.

[0083] According to the near-eye optical system provided in the above embodiment, its optical architecture can be seen in Figures 1 and 6 . A light shielding element 7 is provided on the surface of the first lens 5 near the human eye 6. Specifically, the light shielding element 7 is arranged around the edge area of ​​the surface of the first lens 5 near the human eye 6. The provision of the light shielding element 7 can effectively block the field of view outside the optically effective field of view, thereby reducing stray light.

[0084] Referring to Figure 9, on the basis of a shading element 7 provided on one surface of the first lens 5, the near-eye optical system should satisfy the constraint of the relationship: tan(θ1)*(T1-L1+L5)≤50mm, where T1 is the total optical length of the near-eye optical system, L1 is the distance between the center of the convex surface of the first lens 5 and point A, and point A is the orthographic projection point of the connection point between the transition section 93 and the second bearing section 92 on the optical axis of the near-eye display system, and L5 is the length of the transition section 93. It should be noted that the units of T1, L1, and L5 are all mm. In this application, by constraining the above parameters of the near-eye optical system, the volume of the entire near-eye optical system can be effectively reduced.

[0085] Specifically, compared with the traditional folded optical path solution, the volume of the near-eye optical system provided by the embodiment of the present application is significantly reduced. For example, the volume can be reduced by more than 1 / 5 of the traditional optical solution.

[0086] The near-eye optical system provided in the embodiments of the present application is an optical architecture based on a folded optical path. By rationally constraining optical parameters and adding a shading element 7 to block stray light, the new optical architecture achieves a virtual reality solution with a large field of view and a small size, while also ensuring excellent imaging quality. The near-eye optical system provided in the embodiments of the present application has excellent optical performance. The field of view angle (FOV) of the near-eye optical system provided in the embodiments of the present application can reach over 95 degrees.

[0087] The near-eye optical system provided in the above-mentioned embodiments of the present application has the advantage of a small size, and can realize a lightweight design of a virtual reality device (VR device) using the near-eye optical system, which is more suitable for users to wear, can improve wearing comfort, and will not cause fatigue even when worn for a long time.

[0088] The near-eye optical system provided in the embodiment of the present application is a folded light path optical architecture. For example, in addition to introducing a lens in the first optical element, a spectrometer 12, a phase delay 11 and a polarization reflection element 10 are also introduced, which can be used to form a folded light path in the first optical element, so that the light is folded back therein, so as to extend the propagation path of the light and facilitate the final clear imaging.

[0089] The light splitting element 12 is, for example, a semi-transparent and semi-reflective film.

[0090] It should be noted that the reflectivity and transmittance of the light-splitting element 12 can be flexibly adjusted according to specific needs, and this is not limited in the embodiments of the present application.

[0091] The phase retarder 11 is, for example, a quarter-wave plate.

[0092] Of course, the phase retarder 11 here can also be set as other phase retarder plates such as half-wave plates as needed.

[0093] The phase retarder 11 can be used to convert linearly polarized light into circularly polarized light, or convert circularly polarized light into linearly polarized light.

[0094] The polarized reflective element 10 is, for example, a linear polarizer, which is a polarizer that reflects horizontally polarized light and transmits vertically polarized light, or a polarizer that reflects linearly polarized light at any other specific angle and transmits linearly polarized light perpendicular to the angle.

[0095] The near-eye optical system provided in the embodiments of the present application is conducive to realizing a virtual reality optical solution with a large field of view and a small volume.

[0096] In some examples of the present application, referring to Figures 9 to 11 , the shading element 7 is a shading ring, and the inner edge of the shading element 7 has a first sharp angle structure 71. The angle of the first sharp angle structure 71 is θ2, and abs(θ2)≥5°.

[0097] According to the above example, a shading element 7 is provided on the surface of the first lens 5 close to the human eye 6. The shading element 7 is a ring-shaped structure and a sharp-angle structure, namely the above-mentioned first sharp-angle structure 71, can be provided on its inner ring. The design of the first sharp-angle structure 71 can make the position of blocking light more accurate, thereby achieving better blocking of field light outside the optical effective field of view, and further reducing stray light.

[0098] When the angle θ2 of the first sharp-angle structure 71 satisfies: abs(θ2)≥5°, the effect of reducing stray light is better.

[0099] That is, the absolute value of the angle θ2 of the first sharp angle structure 71 should be designed to be no less than 5°. It should be noted that the direction of the sharp angle on the shading element 7 can be adjusted.

[0100] In some examples of the present application, referring to FIG1 and FIG6 , the near-eye optical system includes a display 1, which is connected to an end of the second supporting section 92 away from the transition section 93 via a bracket 2. The shading element 7 is located in an edge region of the surface of the first lens 5 away from the display 1.

[0101] The display 1 can emit light for imaging display.

[0102] A screen protection element 18 may be provided on the light emitting surface of the display 1 , as shown in FIG6 . The screen protection element 18 can effectively protect the display 1 .

[0103] The lens barrel 9 has a three-section design, comprising a first supporting section 91, a transition section 93, and a second supporting section 92, which are connected in sequence. The first optical element is disposed within the first supporting section 91, and the display 1 is disposed within the second supporting section 92. In this configuration, the first optical element and the display 1 are disposed at opposite ends of the lens barrel 9. Because the first optical element is larger than the display 1, the transition section 93 on the lens barrel 9 forms an inclined state between the first optical element and the display 1. In the optical scheme of the present embodiment, the inclination angle θ1 of the transition section 93 relative to the optical axis is constrained to satisfy the following relationship: tan(θ1)*(T1-L1+L5)≤50mm; the total optical length T1 of the near-eye optical system; the distance L1 from the vertex of the first lens 5 to the connection point A between the transition section 93 and the second supporting section 92; and the length L5 of the transition section 93. This effectively reduces the volume of the entire near-eye optical system under a large field of view, for example, by more than one-fifth of that of a conventional scheme.

[0104] It should be noted that in the constraint condition tan(θ1)*(T1-L1+L5)≤50mm provided in the embodiment of the present application, T1 is the total length of the near-eye optical system, which may include the display 1 or may not include the display 1.

[0105] The lens barrel 9 may be composed of a first supporting section 91 , a transition section 93 and a second supporting section 92 connected in sequence, and the lens barrel 9 is an integrally formed structure.

[0106] In some examples of the present application, referring to Figures 1 and 6 , the bracket 2 includes a main section 21 and an extension section 22 connected to the main section 21. The extension section 22 is connected to the second supporting section 92. The main section 21 forms a predetermined angle θ3 with the optical axis, where θ3 is less than 90°. The display 1 is disposed at an end of the main section 21 away from the extension section 22.

[0107] According to the above example, the bracket 2 is a connector connecting the display 1 and the lens barrel 9. It is not a straight-tube structure, but rather comprises a two-section structure, specifically, a main section 21 and an extension section 22. The extension section 22 is connected to one end of the second supporting section 92 of the lens barrel 9. The extension section 22 can be a straight-walled structure to provide a certain degree of shielding or positioning for the edge area of ​​the lens disposed therein. Referring to Figures 9 to 11, the main section 21 has a certain inclination angle relative to the optical axis, and its inclination range can be consistent with that of the transition section 93 of the lens barrel 9. This design can reduce the volume of the near-eye optical system.

[0108] The main section 21 and the extension section 22 are connected as a whole to form the bracket 2 .

[0109] In some examples of the present application, referring to FIG1 , the near-eye optical system further includes a second optical element, which is disposed in the second supporting section 92 of the lens barrel 9 and is located on the same optical axis as the first optical element; the second optical element includes at least one lens.

[0110] According to the near-eye optical system provided in an embodiment of the present application, an optical element can be added to the side close to the display 1, that is, the second optical element in the above example is arranged between the first optical element and the display 1, which can improve the optical performance of the near-eye optical system.

[0111] In some examples of the present application, referring to FIG1 , the second optical element includes at least a third lens 3; the extension section 22 of the bracket 2 is arranged on an edge area of ​​the surface of the third lens 3 close to the display 1; a second extension section 95 is formed at the connection point between the transition section 93 and the second supporting section 92, and the second extension section 95 is arranged on an edge area of ​​the surface of the third lens 3 away from the display 1.

[0112] According to the above example, after the third lens 3 is positioned on the side close to the display 1, the extension section 22 of the bracket 2 can be used to partially shield the edge area of ​​the third lens 3 on the surface close to the display 1. Furthermore, the second extension section 95 at the connection position A between the transition section 93 and the second supporting section 92 can also partially shield the edge area of ​​the third lens 3 on the surface away from the display 1. This design allows the third lens 3 to block light outside the optically effective field of view, which is beneficial for reducing stray light.

[0113] At the same time, the extension section 22 and the second extension section 95 can also position and support the third lens 3 , thereby facilitating the assembly of the third lens 3 in the lens barrel 9 .

[0114] In some examples of the present application, the display 1 is configured to emit natural light or circularly polarized light. When the light emitted by the display 1 is natural light, a composite film is provided on the light-emitting surface of the display 1. The composite film includes two phase retarders 15 and a polarizer 16 disposed between the two phase retarders 15, and can be used to convert the natural light into circularly polarized light.

[0115] When only the first lens 5 and the third lens 3 are used in the near-eye optical system, the composite film material can be disposed on the display 1 .

[0116] The composite film is used to convert natural light into circularly polarized light. The composite film is designed with two layers of phase retarders 15 to reduce stray light. The phase retarder is, for example, a quarter-wave plate.

[0117] Optionally, a second anti-reflection film 17 may be introduced into the composite film material.

[0118] In some examples of the present application, the beam splitter 12 is disposed on the surface of the first lens 5 close to the display 1 ; the phase retarder 11 and the polarized reflective element 10 are stacked and disposed on the surface of the first lens 5 away from the display 1 .

[0119] In some examples of the present application, the first optical element further includes a polarizing element 13 , which is stacked with the polarizing reflecting element 10 and the phase retarder 11 to form a stacked element, and the polarizing reflecting element 10 is located between the polarizing element 13 and the phase retarder 11 .

[0120] The polarizing element 13 is, for example, a linear polarizer (or polarizer).

[0121] The polarizing element 13 has the same transmission direction as the polarizing reflective element 10 . The polarizing element 13 can be used to reduce ghost images and stray light.

[0122] Optionally, a first anti-reflection film 14 may be provided on the surface of the phase retarder 11 facing away from the polarizing reflection element 10 .

[0123] In some examples of the present application, referring to FIG6 , the first optical element further includes a second lens 4, which is disposed on a side of the first lens 5 facing away from the shading element 7. A spacer element 8 is disposed between the first lens 5 and the second lens 4, and the spacer element 8 is disposed between an edge region of the first lens 5 and an edge region of the second lens 4.

[0124] For the near-eye optical system provided in the embodiments of the present application, the number of optical lenses in the first optical element can be increased. For example, referring to Figure 6 , a second lens 4 is introduced into the first optical element. In other words, the first optical element may include a first lens 5 and a second lens 4. The second lens 4 is located closer to the display 1 than the first lens 5. The introduction of the second lens 4 helps reduce the total optical length of the near-eye optical system while improving image quality.

[0125] When the first lens 5 and the second lens 4 are used in the first optical element, a spacer element 8 is required between them. Specifically, the spacer element 8 can be placed between the edge regions of the two optical lenses to effectively block light outside the optically effective field of view. When used in conjunction with the light-shielding element 7, stray light can be further reduced.

[0126] In some examples of the present application, referring to FIG. 6 , the transition section 93 and the first supporting section 91 are connected at position B to form a first extension section 94 , and the first extension section 94 is arranged around the edge area of ​​the surface of the second lens 4 close to the display 1 .

[0127] According to the above example, the first extension section 94 extending from the connection position B between the transition section 93 and the first supporting section 91 can form a certain shielding in the edge area of ​​the surface of the second lens 4 close to the display 1, and can form a shielding cooperation with the spacer element 8.

[0128] At the same time, the first extension section 94 can position the second lens 4 when assembled in the lens barrel 9 , thereby facilitating the installation of the second lens 4 .

[0129] In some examples of the present application, referring to FIG11 , the near-eye optical system satisfies: (L2+L4) / L3≥5, where L2 is the thickness of the edge area of ​​the first lens 5 , L4 is the thickness of the edge area of ​​the second lens 4 , and L3 is the thickness of the spacer element 8 .

[0130] According to the above example, when the near-eye optical system satisfies (L2+L4) / L3≥5, the feasibility of assembling the second lens 4 and the spacer element 8 can be guaranteed.

[0131] In some examples of the present application, the spacer element 8 is an annular structure, and the inner edge of the spacer element 8 has a second sharp angle structure; the angle of the second sharp angle structure is θ4, and abs(θ4)≥5°.

[0132] The spacer element 8 is a spacer ring disposed between two optical lenses. A second sharp angle structure can be provided on its inner ring to more accurately block light. When the angle of the second sharp angle structure is θ4 and satisfies the following condition: abs(θ2) ≥ 5°, the stray light reduction effect is optimal.

[0133] In some examples of the present application, when the thickness L3 of the spacer element 8 is less than or equal to 0.1 mm, the spacer element 8 is an opaque Mylar sheet.

[0134] In the near-eye optical system provided in the embodiment of the present application, when a spacer element 8 is introduced between the first lens 5 and the second lens 4, the spacer element 8 has thickness restrictions during assembly and production and should be as thin as possible. Mylar sheets can be made very thin to meet assembly and optical performance requirements.

[0135] Among them, black ring-shaped Mylar sheets can be used.

[0136] That is to say, when L3≤0.1mm, the spacer ring can be replaced by black Mylar sheet, which has a thin sheet structure and is lighter and thinner.

[0137] In some examples of the present application, the display 1 is configured to emit natural light or circularly polarized light; when the light emitted by the display 1 is natural light, a composite film material is provided on the surface of the third lens 3 away from the display 1, and the composite film material includes two phase retarders 15 and a polarizer 16 arranged between the two phase retarders 15, see Figure 8, which can be used to convert natural light into circularly polarized light.

[0138] According to the above example, the composite film is used to convert natural light into circularly polarized light. The composite film is designed with two phase retarder plates 15 to reduce stray light. The phase retarder plates are, for example, quarter-wave plates.

[0139] When three lenses are used in a near-eye optical system, such as the optical architecture shown in FIG6 , the composite film material can be disposed on the surface of the third lens 3 away from the display 1 .

[0140] If two lenses are used in the near-eye optical system, such as the optical architecture shown in FIG1 , the composite film material can be disposed on the light-emitting surface of the display 1 , so that the display 1 can directly emit circularly polarized light.

[0141] Optionally, as shown in FIG8 , a second anti-reflection film 17 may be introduced into the composite film material.

[0142] In some examples of the present application, the beam splitter 12 is disposed on the surface of the second lens 4 close to the display 1 ; referring to FIG. 7 , the phase retarder 11 and the polarizing reflective element 10 are stacked and disposed on the surface of the first lens 5 close to the display 1 .

[0143] The beam splitter 12, for example, is a quarter-wave plate, which can be directly mounted or plated onto the surface of the second lens 4 proximal to the display 1 (the third surface 41 shown in FIG6 ). The phase retarder 11 and the polarizing reflective element 10 are stacked together and disposed on the surface of the first lens 5 proximal to the display 1 (the first surface 51 shown in FIG6 ). This eliminates the need for a separate flat support member in the optical architecture to support these optical elements.

[0144] The polarizing reflective element 10 and the phase retarder 11 are arranged on the same side of the first lens 5 to reduce the difficulty of the assembly process.

[0145] The angle between the reflection direction of the polarized reflection element 10 and the fast axis or slow axis of the phase retarder 11 is 45°.

[0146] In some examples of the present application, referring to FIG7 , the first optical element further includes a polarizing element 13 , which is stacked with the polarizing reflecting element 10 and the phase retarder 11 to form a superimposed element, and the polarizing reflecting element 10 is located between the polarizing element 13 and the phase retarder 11 .

[0147] The polarizing element 13 is, for example, a linear polarizer (or polarizer).

[0148] The polarizing element 13 has the same transmission direction as the polarizing reflective element 10 . The polarizing element 13 can be used to reduce ghost images and stray light.

[0149] Optionally, referring to FIG. 7 , a first anti-reflection film 14 may be provided on the surface of the phase retarder 11 facing away from the polarizing reflection element 10 .

[0150] It should be noted that the near-eye optical system provided in the embodiments of the present application does not impose a specific limit on the number of optical lenses used. A minimum of one optical lens, namely the first lens 5, is used. In actual applications, the number of lenses can be designed based on specific needs. Increasing the number of lenses can improve imaging quality and appropriately reduce the overall optical length of the system, but this may increase the weight and production cost of the entire near-eye optical system.

[0151] As a more preferred solution of the present application, three lenses can be used in the near-eye optical system. In this case, the optical performance of the near-eye optical system is better.

[0152] Referring to FIGS. 6 to 8, the light propagation process of the near-eye optical system is as follows:

[0153] The natural light emitted by the display 1 remains natural light after passing through a phase retarder 15 on the surface of the third lens 3, becomes linearly polarized light after passing through a polarizer 16, becomes circularly polarized light after passing through another phase retarder 15, is transmitted through the second lens 4, becomes linearly polarized light (S light) after passing through a phase retarder 11 on the surface of the first lens 5, is reflected by the polarization reflection element 10, becomes circularly polarized light after passing through the phase retarder 11 again, is reflected by a beam splitting element 12 on the surface of the second lens 4, becomes linearly polarized light (P light) after passing through the phase retarder 11 on the surface of the first lens 5, and then is transmitted through the first lens 5 and enters the human eye 6 for imaging.

[0154] According to the near-eye optical system provided by the embodiment of the present application, referring to FIG. 6, it may include three lenses, such as a first lens 5, a second lens 4, and a third lens 3 arranged along the same optical axis.

[0155] Optionally, the refractive index n of the materials used for the optical lenses included in the near-eye optical system ranges from: 1.4 < n < 1.7, and the dispersion coefficient v ranges from 20 < v < 75.

[0156] For example, the refractive index n1 of the first lens 5 is 1.54, and the dispersion coefficient v1 is 55.7. The refractive index n2 of the second lens 4 is 1.54, and the dispersion coefficient v2 is 56.3. The refractive index n3 of the third lens 3 is 1.54, and the dispersion coefficient v3 is 56.3.

[0157] Among them, the central thickness T1 of the first lens 5 is, for example: 1 mm ≤ T1 ≤ 8 mm. The optical power φ1 of the first lens 5 is 0 < φ1 < 0.1.

[0158] The first lens 5 includes two optical surfaces, namely a first surface 51 close to the display 1 and a second surface 52 far from the display 1.

[0159] Both the first surface 51 and the second surface 52 are aspherical or flat.

[0160] A film layer structure may be provided on the first surface 51. As shown in FIG. 7, it includes a first anti-reflection film 14, a polarization element 13 (transmitting P light), a polarization reflection element 10 (transmitting P light and reflecting S light), and a phase retarder 11. The polarization element 13 can reduce stray light.

[0161] In addition, an anti-reflection film may be selectively provided on the second surface 52.

[0162] The center thickness T2 of the second lens 4 is: 1mm≤T2≤8mm. The optical power φ2 of the second lens 4 is 0<φ2<0.1.

[0163] The second lens 4 includes two optical surfaces, namely a third surface 41 close to the display 1 and a fourth surface 42 far from the display 1 .

[0164] The third surface 41 and the fourth surface 42 are aspherical surfaces.

[0165] A light splitting element 12 , ie, a semi-transmissive and semi-reflective film, may be provided on the third surface 41 .

[0166] The fourth surface 42 is a plane or an aspherical surface, and an anti-reflection film layer can be selectively provided on the fourth surface 42 .

[0167] The central thickness T3 of the third lens 3 is: 1 mm ≤ T3 ≤ 8 mm. The optical power φ3 of the third lens 3 is 0 ≤ φ3 < 0.01.

[0168] The third lens 3 includes two optical surfaces, namely a fifth surface 31 close to the display 1 and a sixth surface 32 far from the display 1 .

[0169] The fifth surface 31 and the sixth surface 32 may be aspherical surfaces or planar surfaces.

[0170] A composite film material as shown in FIG8 may be provided on the fifth surface 31, comprising a second anti-reflection film 17, two phase retarders 15 (quarter-wave plates), and a polarizer 16 located between the two phase retarders 15. An anti-reflection film layer may also be optionally provided on the sixth surface 32.

[0171] The near-eye optical system provided by the embodiments of the present application is described below through four embodiments.

[0172] Example 1

[0173] 1 , the near-eye optical system includes a lens barrel 9, and a first optical element, a second optical element, and a display 1 disposed in the lens barrel 9 and located on the same optical axis;

[0174] The display 1 is capable of emitting natural light. A composite film is provided on the light-emitting surface of the display 1. The composite film includes two phase retarders 15 and a polarizer 16 provided between the two phase retarders 15.

[0175] The first optical element includes a first lens 5. A beam splitter 12 is disposed on a surface of the first lens 5 close to the display 1. A polarizing element 13, a polarizing reflective element 10, and a phase retarder 11 are stacked on a surface of the first lens 5 away from the display 1, with the phase retarder 11 located between the beam splitter 12 and the polarizing reflective element 10. A light shielding element 7 is provided around the edge of the surface of the first lens 5 facing away from the display 1.

[0176] The second optical element includes a third lens 3;

[0177] 9 to 11 , the lens barrel 9 includes a first supporting section 91, a second supporting section 92, and a transition section 93 connected between the first supporting section 91 and the second supporting section 92. The first optical element is disposed within the first supporting section 91, and the transition section 93 forms a target angle θ1 with respect to the optical axis of the near-eye optical system, where θ1 is less than 90°. The second optical element is disposed within the second supporting section 92. The display 1 is connected to an end of the second supporting section 92 away from the transition section 93 via a bracket 2.

[0178] The bracket 2 includes a main section 21 and an extension section 22 connected to the main section 21; wherein, the extension section 22 is connected to the second supporting section 92, the main section 21 forms a set angle θ3 with the optical axis, and θ3 is less than 90°; the extension section 22 of the bracket 2 is arranged on the edge area of ​​the surface of the third lens 3 close to the display 1; the connection position A of the transition section 93 of the lens barrel 9 and the second supporting section 92 forms a second extension section 95, and the second extension section 95 is arranged on the edge area of ​​the surface of the third lens 3 away from the display 1.

[0179] Table 1 shows the optical parameters of the near-eye optical system, which are as follows.

[0180] Table 1

[0181] The optical performance of the near-eye optical system provided in the above-mentioned embodiment 1 is shown in Figures 2 to 5: Figure 2 is a schematic diagram of the point arrangement diagram of the near-eye optical system, Figure 3 is an MTF curve diagram of the near-eye optical system, Figure 4 is a field curvature distortion diagram of the near-eye optical system, and Figure 5 is a vertical axis chromatic aberration diagram of the near-eye optical system.

[0182] A spot diagram is a diffuse pattern formed by the intersection of many light rays emitted from a single point with the image plane after passing through the near-eye optical system. Due to aberrations, these light rays no longer converge at the same point, but instead form a diffuse pattern spread over a certain range. This pattern can be used to evaluate the imaging quality of near-eye optical systems. As shown in Figure 2, the maximum image point size in this spot diagram is less than 17 μm.

[0183] The MTF curve, a modulation transfer function, measures the image clarity of a near-eye optical system by measuring the contrast between black and white line pairs. As shown in Figure 3, the center MTF is >0.3 at 40 lp / mm, indicating a clear image.

[0184] As shown in FIG4 , the maximum distortion occurs in the first field of view, and the absolute value is less than 40%.

[0185] Vertical axial chromatic aberration, also known as chromatic aberration of magnification, primarily refers to the difference in focal position between blue and red light on the image plane, caused by the dispersion of a single, multi-colored principal ray on the object side. As shown in Figure 5, the maximum chromatic aberration in near-eye optical systems is less than 200μm.

[0186] Example 2

[0187] The difference between the second embodiment and the first embodiment is that a second lens 4 is introduced into the first optical element, and the mounting positions of the optical films are different.

[0188] 6 to 8 , the near-eye optical system includes a lens barrel 9, and a first optical element, a second optical element, and a display 1 disposed in the lens barrel 9 and located on the same optical axis. The display 1 is configured to emit natural light.

[0189] The first optical element includes a first lens 5 and a second lens 4. A beam splitter 12 is disposed on the surface of the second lens 4 proximal to the display 1. A polarizing element 13, a polarizing reflective element 10, and a phase retarder 11 are stacked on the surface of the first lens 5 proximal to the display 1, with the phase retarder 11 located between the beam splitter 12 and the polarizing reflective element 10. A light shielding element 7 is disposed around the edge of the surface of the first lens 5 facing away from the display 1. A spacer 8 is disposed between the first lens 5 and the second lens 4, and the spacer 8 is disposed between the edge of the first lens 5 and the edge of the second lens 4.

[0190] The second optical element includes a third lens 3 , a composite film material is provided on a surface of the third lens 3 away from the display 1 , and the composite film material includes two phase retarders 15 and a polarizer 16 provided between the two phase retarders 15 ;

[0191] 9 to 11 , the lens barrel 9 includes a first bearing section 91 , a second bearing section 92 , and a transition section 93 connected between the first bearing section 91 and the second bearing section 92 ;

[0192] The first optical element is disposed in the first bearing section 91 , and the transition section 93 forms a target angle θ1 with respect to the optical axis of the near-eye optical system, and θ1 is less than 90°;

[0193] The second optical element is disposed in the second carrying section 92;

[0194] The display 1 is connected to the end of the second supporting section 92 away from the transition section 93 via a bracket 2. The bracket 2 includes a main section 21 and an extension section 22 connected to the main section 21. The extension section 22 is connected to the second supporting section 92. The main section 21 forms a set angle θ3 with the optical axis, and θ3 is less than 90°.

[0195] The near-eye optical system satisfies: (L2+L4) / L3≥5, where L2 is the thickness of the edge region of the first lens, L4 is the thickness of the edge region of the second lens, and L3 is the thickness of the spacer element;

[0196] The extension section 22 of the bracket 2 is arranged on the edge area of ​​the surface of the third lens 3 close to the display 1; the connection position A of the transition section 93 of the lens barrel 9 and the second supporting section 92 forms a second extension section 95, and the second extension section 95 is arranged on the edge area of ​​the surface of the third lens 3 away from the display 1; the connection position B of the transition section 93 and the first supporting section 91 forms a first extension section 94, and the first extension section 94 is arranged on the edge area of ​​the surface of the second lens 4 close to the display 1.

[0197] Table 2 shows the optical parameters of the near-eye optical system, which are as follows.

[0198] Table 2

[0199] The optical performance of the near-eye optical system provided in the above-mentioned embodiment 2 is shown in Figures 12 to 15: Figure 12 is a schematic diagram of the point arrangement diagram of the near-eye optical system, Figure 13 is an MTF curve diagram of the near-eye optical system, Figure 14 is a field curvature distortion diagram of the near-eye optical system, and Figure 15 is a vertical axis chromatic aberration diagram of the near-eye optical system.

[0200] A spot diagram is a diffuse pattern formed when many light rays emitted from a single point, after passing through a near-eye optical system, intersect with the image plane due to aberrations, forming a pattern scattered over a certain range. This pattern can be used to evaluate the imaging quality of near-eye optical systems. As shown in Figure 12, the maximum image point size in this spot diagram is less than 9 μm.

[0201] The MTF curve, a modulation transfer function, measures the image clarity of a near-eye optical system by measuring the contrast between black and white line pairs. As shown in Figure 13, the center MTF is >0.5 at 40 lp / mm, indicating a clear image.

[0202] As shown in FIG14 , the maximum distortion occurs in the first field of view, and the absolute value is less than 40%.

[0203] Vertical axial chromatic aberration, also known as chromatic aberration of magnification, primarily refers to the difference in focal position between blue and red light on the image plane, as a single, multi-color principal ray on the object side, due to dispersion in the refractive system, becomes multiple rays upon exiting the image side. As shown in Figure 15, the maximum chromatic aberration in a near-eye optical system is less than 200 μm.

[0204] Example 3

[0205] 16 , which shows the near-eye optical system provided by this embodiment 3, which differs from the near-eye optical system shown in embodiment 2 in terms of the parameters of the optical elements.

[0206] Table 3 shows the optical parameters of the near-eye optical system, which are as follows.

[0207] Table 3

[0208] The optical performance of the near-eye optical system provided in this embodiment 3 can be shown in Figures 17 to 20: Figure 17 is a schematic diagram of the point arrangement of the near-eye optical system, Figure 18 is an MTF curve diagram of the near-eye optical system, Figure 19 is a field curvature distortion diagram of the near-eye optical system, and Figure 20 is a vertical axis chromatic aberration diagram of the near-eye optical system.

[0209] A spot diagram is a diffuse pattern formed by the intersection of many light rays emitted from a single point with the image plane after passing through the near-eye optical system. Due to aberrations, these light rays no longer converge at the same point, but instead form a diffuse pattern spread over a certain range. This pattern can be used to evaluate the imaging quality of near-eye optical systems. As shown in Figure 17, the maximum image point size in this spot diagram is less than 21 μm.

[0210] The MTF curve, a modulation transfer function (MTF), measures the image clarity of near-eye optical systems by measuring the contrast between black and white line pairs. As shown in Figure 18, the center MTF is >0.4 at 40 lp / mm, indicating clear imaging.

[0211] As shown in FIG19 , the maximum distortion occurs in the first field of view, and the absolute value is less than 40%.

[0212] Vertical axial chromatic aberration, also known as chromatic aberration of magnification, primarily refers to the difference in focal position between blue and red light on the image plane, as a single, multi-color principal ray on the object side, due to dispersion in the refractive system, becomes multiple rays upon exiting the image side. As shown in Figure 20, the maximum chromatic aberration in near-eye optical systems is less than 200 μm.

[0213] Example 4

[0214] 21 , which shows the near-eye optical system provided by this embodiment 4, which differs from the near-eye optical system shown in embodiment 2 in terms of the parameters of the optical elements.

[0215] Table 4 shows the optical parameters of the near-eye optical system, which are as follows.

[0216] Table 4

[0217] The optical performance of the near-eye optical system provided in this embodiment 4 can be shown in Figures 22 to 25: Figure 22 is a schematic diagram of the point arrangement of the near-eye optical system, Figure 23 is an MTF curve diagram of the near-eye optical system, Figure 24 is a field curvature distortion diagram of the near-eye optical system, and Figure 25 is a vertical axis chromatic aberration diagram of the near-eye optical system.

[0218] A spot diagram is a diffuse pattern formed when many light rays emitted from a single point, after passing through a near-eye optical system, intersect with the image plane due to aberrations, forming a pattern scattered over a certain range. This pattern can be used to evaluate the imaging quality of near-eye optical systems. As shown in Figure 22, the maximum image point size in this spot diagram is less than 15 μm.

[0219] The MTF curve, a modulation transfer function (MTF), measures the image clarity of near-eye optical systems by measuring the contrast between black and white line pairs. As shown in Figure 23, the center MTF is >0.15 at 40 lp / mm, indicating clear imaging.

[0220] As shown in FIG24 , the maximum distortion occurs in 1 field of view, and the absolute value is less than 40%.

[0221] Vertical chromatic aberration, also known as chromatic aberration of magnification, primarily refers to the difference in focal position between blue and red light on the image plane, as a single, multi-color principal ray on the object side, due to dispersion in the refractive system, becomes multiple rays upon exiting the image side. As shown in Figure 25, the maximum chromatic aberration in near-eye optical systems is less than 200 μm.

[0222] According to another embodiment of the present application, a head-mounted display device is provided.

[0223] The head-mounted display device includes a housing and the near-eye optical system as described above.

[0224] Among them, the head-mounted display device can be in the form of VR glasses or VR helmets, which is not limited in the embodiments of the present application.

[0225] The specific implementation of the head-mounted display device of the embodiment of the present application can refer to the above-mentioned embodiments of the near-eye optical system, and therefore at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0226] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0227] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above examples may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A near-eye optical system, characterized in that: It comprises a lens barrel (9) and a first optical element arranged in the lens barrel (9); The first optical element comprises at least a first lens (5), a polarized reflection element (10), a phase retarder (11) and a beam splitter (12); a shading element (7) is provided around one surface of the first lens (5); The lens barrel (9) comprises a first bearing section (91), a second bearing section (92) and a transition section (93) connected between the first bearing section (91) and the second bearing section (92); the first optical element is arranged in the first bearing section (91), and the transition section (93) forms a target angle θ1 with respect to the optical axis of the near-eye optical system, and θ1 is less than 90°; The near-eye optical system satisfies the following: tan(θ1)*(T1-L1+L5)≤50, wherein T1 is the total optical length of the near-eye optical system, L1 is the distance from the surface center point O of the first lens (5) on the side where the shading element (7) is provided to point A, and point A is the orthographic projection point of the connection point between the transition section (93) and the second bearing section (92) on the optical axis of the near-eye display system, and L5 is the length of the transition section (93).

2. The near-eye optical system according to claim 1, characterized in that: The shading element (7) is a shading ring, and the inner edge of the shading element (7) has a first sharp angle structure (71); The angle of the first sharp angle structure (71) is θ2, and abs(θ2)≥5°.

3. The near-eye optical system according to claim 1 or 2, characterized in that: The near-eye optical system comprises a display (1), wherein the display (1) is connected to an end of the second bearing section (92) away from the transition section (93) via a bracket (2); The shading element (7) is located in an edge region of the surface of the first lens (5) away from the display (1).

4. The near-eye optical system according to claim 3, characterized in that: The bracket (2) comprises a main section (21) and an extension section (22) connected to the main section (21); The extension section (22) is connected to the second bearing section (92), and the main section (21) forms a set angle θ3 with the optical axis, and θ3 is less than 90°; The display (1) is arranged at an end of the main body section (21) away from the extension section (22).

5. The near-eye optical system according to claim 4, characterized in that: The near-eye optical system further comprises a second optical element, which is arranged in a second bearing section (92) of the lens barrel (9) and is located on the same optical axis as the first optical element; The second optical element includes at least one lens.

6. The near-eye optical system according to claim 5, characterized in that: The second optical element comprises at least a third lens (3); The extension section (22) of the bracket (2) is arranged around an edge area of ​​the surface of the third lens (3) close to the display (1); A second extension section (95) is formed at the connection point between the transition section (93) and the second bearing section (92), and the second extension section (95) is arranged around an edge area on the surface of the third lens (3) away from the display (1).

7. The near-eye optical system according to claim 6, characterized in that: The display (1) is configured to emit natural light or circularly polarized light; When the light emitted by the display (1) is natural light, a composite film material is arranged on the light-emitting surface of the display (1), and the composite film material includes two phase retarders (15) and a polarizer (16) arranged between the two phase retarders (15), and can be used to convert natural light into circularly polarized light.

8. The near-eye optical system according to claim 7, characterized in that: The light splitting element (12) is arranged on a surface of the first lens (5) close to the display (1); The phase retarder (11) and the polarized reflective element (10) are stacked and arranged on a surface of the first lens (5) away from the display (1).

9. The near-eye optical system according to claim 8, characterized in that: The first optical element further comprises a polarizing element (13), wherein the polarizing element (13) is stacked with the polarizing reflecting element (10) and the phase retarder (11) to form a stacked element, and the polarizing reflecting element (10) is located between the polarizing element (13) and the phase retarder (11).

10. The near-eye optical system according to claim 6, characterized in that: The first optical element further comprises a second lens (4), wherein the second lens (4) is arranged on a side of the first lens (5) away from the shading element (7); A spacer element (8) is arranged between the first lens (5) and the second lens (4), and the spacer element (8) is arranged between the edge area of ​​the first lens (5) and the edge area of ​​the second lens (4).

11. The near-eye optical system according to claim 10, characterized in that: The transition section (93) and the first bearing section (91) are connected at a connection point B to form a first extension section (94), and the first extension section (94) is arranged around an edge area of ​​the surface of the second lens (4) close to the display (1).

12. The near-eye optical system according to claim 10, characterized in that: The near-eye optical system satisfies: (L2+L4) / L3≥5, L2 is the thickness of the edge region of the first lens (5), L4 is the thickness of the edge region of the second lens (4), and L3 is the thickness of the spacer element (8).

13. The near-eye optical system according to claim 10, characterized in that: The spacer element (8) is an annular structure, and the inner edge of the spacer element (8) has a second sharp angle structure; The angle of the second pointed structure is θ4, and abs(θ4)≥5°.

14. The near-eye optical system according to claim 10, characterized in that: When the thickness L3 of the spacer element (8) is less than or equal to 0.1 mm, the spacer element (8) is an opaque Mylar sheet.

15. The near-eye optical system according to claim 10, characterized in that: The display (1) is configured to emit natural light or circularly polarized light; When the light emitted by the display (1) is natural light, a composite film material is arranged on the surface of the third lens (3) away from the display (1), and the composite film material comprises two phase retarders (15) and a polarizing plate (16) arranged between the two phase retarders (15), and can be used to convert natural light into circularly polarized light.

16. The near-eye optical system according to claim 15, characterized in that: The light splitting element (12) is arranged on a surface of the second lens (4) close to the display (1); The phase retarder (11) and the polarized reflection element (10) are stacked and arranged on a surface of the first lens (5) close to the display (1).

17. The near-eye optical system according to claim 16, wherein: The first optical element further comprises a polarizing element (13), wherein the polarizing element (13) is stacked with the polarizing reflecting element (10) and the phase retarder (11) to form a stacked element, and the polarizing reflecting element (10) is located between the polarizing element (13) and the phase retarder (11).

18. A head mounted display device, characterized in that: include: case; as well as A near-eye optical system as claimed in any one of claims 1 to 17.

Images