Near-eye display modules and wearable devices

Abstract

The embodiments of the present application provide a near-eye display module and a wearable device; wherein the near-eye display module includes an imaging lens group, and a spectroscopic element, a first phase retarder, and a polarizing reflective element provided in the imaging lens group; wherein the first phase retarder is located between the spectroscopic element and the polarizing reflective element; the imaging lens group includes at least a first lens; the first lens has at least one free-form surface, the edge of the first lens includes a thick side and a thin side according to different thicknesses, and the edge thickness of the first lens satisfies: the ratio of the maximum edge thickness H1 to the minimum edge thickness H2 is set to H1 / H2>1.5; the first lens is configured as a cut-edge lens, and the cut edge of the first lens is located on the thick side. The near-eye display module provided by the embodiments of the present application can reasonably increase the interocular distance without increasing the volume of the entire module, which is beneficial to improving the imaging quality.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of optical imaging technology. More specifically, the embodiments of the present application relate to a near-eye display module and a wearable device. Background Art

[0002] In recent years, virtual reality (VR) technology has been rapidly applied in head-mounted display devices (HMDs). The core component of VR technology is the optical module. The quality of the image displayed by the optical module directly determines the quality of the HMD.

[0003] Today, the development trend of virtual reality display products is miniaturization, lightweightness, and high-definition display. As virtual reality display devices become smaller and smaller, optically achieving nearsightedness adjustment becomes difficult. Therefore, to achieve nearsightedness adjustment for virtual reality display devices, glasses are required. This requires a larger interocular distance (the distance between the human eye and the closest lens). A larger interocular distance requires a larger diameter of the optical module lens, which conflicts with the small size of the optical module. Summary of the Invention

[0004] The purpose of this application is to provide a new technical solution for a near-eye display module and a wearable device, which increases the eye distance without increasing the volume of the module and improves the imaging quality of the optical module.

[0005] In a first aspect, the present application provides a near-eye display module. The near-eye display module includes an imaging lens assembly, a beam splitter element, a first phase retarder, and a polarizing reflective element disposed within the imaging lens assembly; wherein the first phase retarder is located between the beam splitter element and the polarizing reflective element;

[0006] The imaging lens assembly includes at least a first lens;

[0007] The first lens has at least one free-form surface. The edge of the first lens includes a thick side and a thin side according to different thicknesses. The edge thickness of the first lens satisfies: a ratio of a maximum edge thickness H1 to a minimum edge thickness H2 is set to H1 / H2>1.5;

[0008] The first lens is configured as a cut-edge lens, and the cut edge of the first lens is located on the thick side.

[0009] Optionally, the ratio of the eye distance L of the near-eye display module to the total length TTL of the optical system is 0.6 to 0.8; wherein the eye distance L is the distance from the human eye to the first lens.

[0010] Optionally, the edge of the first lens has at least one lens cutting edge, and the lens cutting edge is a straight edge to avoid the wearer's nose bridge area.

[0011] Optionally, the imaging lens assembly further includes a second lens and a third lens;

[0012] The first lens, the second lens and the third lens are arranged along the same optical axis; wherein the second lens is located between the first lens and the third lens;

[0013] The surface shapes of the second lens and the third lens include free-form surface, aspherical surface or plane.

[0014] Optionally, the near-eye display module further includes a display screen, the third lens is located on a side close to the display screen, and the display screen is configured to emit circularly polarized light or natural light;

[0015] When the light emitted by the display screen is natural light, a superimposed sheet is provided on either side of the third lens, which can be used to convert the natural light emitted by the display screen into circularly polarized light.

[0016] Optionally, the stacked plate includes a second phase retarder, a third phase retarder, and a second polarization element between the second phase retarder and the third phase retarder.

[0017] Optionally, the superimposed sheet is provided on a surface of the third lens away from the display screen;

[0018] Both surfaces of the third lens are configured as free-form surfaces.

[0019] Optionally, a first polarizing element is further provided in the imaging lens assembly;

[0020] The beam splitter is disposed on either side of the second lens, and the first phase retarder, the polarization reflection element, and the first polarization element are sequentially disposed between the second lens and the first lens.

[0021] Optionally, the beam splitter is provided on a surface of the second lens close to the display screen, and the first phase retarder is provided on a surface of the second lens away from the display screen;

[0022] The surface of the second lens close to the display screen is set to be a free-form surface or an aspherical surface; the surface of the second lens away from the display screen is set to be a flat surface or an aspherical surface.

[0023] Optionally, the polarized reflective element and the first polarizing element are stacked and arranged on a surface of the first lens close to the display screen;

[0024] The surface of the first lens close to the display screen is configured as an aspheric surface, and the surface of the first lens away from the display screen is configured as a free-form surface; or

[0025] The two surfaces of the first lens are configured as free-form surfaces.

[0026] Optionally, the focal length of the first lens is for:

[0027] The focal length of the second lens for:

[0028] The focal length of the third lens for:

[0029] Optionally, the focal length of the near-eye display module is 10 mm to 25 mm.

[0030] Optionally, the eye distance L of the near-eye display module is: L≥13 mm; wherein the eye distance L is the distance between the human eye and the first lens.

[0031] Optionally, the total length TTL of the optical system of the near-eye display module is: TTL≤23 mm.

[0032] In a second aspect, the present application provides a wearable device, comprising:

[0033] a housing; and

[0034] The near-eye display module as described in the first aspect.

[0035] The beneficial effects of this application are:

[0036] According to the near-eye display module provided in the embodiment of the present application, it is a folded optical path structure design. By introducing a free-form surface in the folded optical path design and adjusting the lens on the side near the human eye to a cut-edge lens, while controlling the edge thickness difference of the cut-edge lens, the eye distance can be reasonably increased without additionally increasing the volume of the entire near-eye display module, which is beneficial to improving the imaging quality; moreover, to a certain extent, the versatility of the virtual reality display device is increased.

[0037] 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

[0038] 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.

[0039] Figure 1 This is one of the structural schematic diagrams of the near-eye display module provided in an embodiment of the present application;

[0040] Figure 2 A schematic diagram of a superimposed sheet provided on the surface of the third lens in the near-eye display module provided in an embodiment of the present application;

[0041] Figure 3 A schematic diagram of a first phase retarder and a first anti-reflection film provided on the surface of the second lens in the near-eye display module provided in an embodiment of the present application;

[0042] Figure 4 A schematic diagram of a composite film provided on the surface of a first lens in a near-eye display module provided in an embodiment of the present application;

[0043] Figure 5 for Figure 1 The spot diagram of the near-eye display module is shown;

[0044] Figure 6 for Figure 1 The MTF curve diagram of the near-eye display module shown;

[0045] Figure 7 for Figure 1 The field curvature distortion diagram of the near-eye display module shown;

[0046] Figure 8 for Figure 1 The vertical axis chromatic aberration diagram of the near-eye display module is shown;

[0047] Figure 9 This is one of the structural schematic diagrams of the binocular near-eye display module provided in an embodiment of the present application;

[0048] Figure 10 The second structural diagram of the binocular near-eye display module provided in an embodiment of the present application;

[0049] Figure 11 for Figure 10 A schematic structural diagram of a near-eye display module is shown in FIG;

[0050] Figure 12 for Figure 9 The near-eye display module shown is Figure 11 A comparison diagram of the near-eye display module shown;

[0051] Figure 13 The second structural diagram of the near-eye display module provided in an embodiment of the present application;

[0052] Figure 14 for Figure 13 The spot diagram of the near-eye display module is shown;

[0053] Figure 15 for Figure 13 The MTF curve diagram of the near-eye display module shown;

[0054] Figure 16 for Figure 13 The field curvature distortion diagram of the near-eye display module shown;

[0055] Figure 17 for Figure 13 The vertical axis chromatic aberration diagram of the near-eye display module is shown;

[0056] Figure 18 This is the third structural schematic diagram of the near-eye display module provided in an embodiment of the present application.

[0057] Description of reference numerals:

[0058] 10. First lens; 11. First surface; 12. Second surface; 13. Lens edge; 20. Second lens; 21. Third surface; 22. Fourth surface; 30. Third lens; 31. Fifth surface; 32. Sixth surface; 40. Display screen; 41. Screen protection glass; 50. Beam splitter; 60. First phase retarder; 70. Polarized reflection element; 80. First polarizing element; 90. Laminating plate; 91. Second anti-reflection film; 92. Second phase retarder; 93. Second polarizing element; 94. Third phase retarder; 100. First anti-reflection film; 01. Human eye; 011. Left eye; 012. Right eye; 02. Nose bridge area. DETAILED DESCRIPTION

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] The near-eye display module and wearable device provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0065] According to one aspect of an embodiment of the present application, a near-eye display module is provided, which can be suitable for application in wearable devices such as head-mounted display devices (HMDs), such as VR head-mounted display devices.

[0066] Among them, the VR head-mounted display device may include, for example, VR smart glasses or VR smart helmets, and the specific form of the wearable device is not limited in the embodiments of the present application.

[0067] The near-eye display module proposed in the embodiment of this application is shown in FIG. Figures 1 to 4 The near-eye display module includes an imaging lens assembly, and a beam splitter 50, a first phase retarder 60, and a polarizing reflective element 70 disposed in the imaging lens assembly; wherein the first phase retarder 60 is located between the beam splitter 50 and the polarizing reflective element 70;

[0068] The first lens 10 has at least one free-form surface. The edge of the first lens 10 includes a thick side and a thin side according to different thicknesses. The edge thickness of the first lens 10 satisfies: a ratio of a maximum edge thickness H1 to a minimum edge thickness H2 is set to H1 / H2>1.5. The first lens 10 is configured as a trimmed lens, and a trimmed edge 13 of the first lens 10 is located on the thick side.

[0069] The near-eye display module proposed in the above embodiment of the present application is an optical module based on a folded optical path (pancake). Figures 1 to 4 The beam splitter 50, the first phase retarder 60, the polarized reflective element 70, etc. are reasonably arranged between different lenses in the imaging lens group to enable the near-eye display module to form a folded optical path; wherein the first phase retarder 60 is to be located between the beam splitter 50 and the polarized reflective element 70.

[0070] In the near-eye display module proposed in the embodiment of the present application, see Figure 1, the first lens 10 is designed, for example, as the first lens on the side close to the human eye 01 (that is, the lens closest to the human eye, and the distance between it and the human eye 01 is the interocular distance). By designing the surface of the first lens 10 to have a free-form surface, and designing the first lens 10 as a cut-edge lens, and having an uneven edge thickness, specifically, the edge of the first lens 10 can be divided into a thicker side with a larger thickness and a thinner side with a thinner thickness. For example, the ratio between the thickest thickness and the thinnest thickness of the edge of the first lens 10 is set to be greater than 1.5, and the cut edge 13 of the first lens 10 is located on the thick side. This design can increase the interocular distance (for example, the distance from the human eye 01 to the first lens 10) without increasing the volume of the entire near-eye display module, thereby improving the imaging picture quality of the entire near-eye display module and thereby improving the user's visual experience.

[0071] The near-eye display module proposed in the embodiment of the present application is conducive to achieving the requirements of miniaturization, lightness and high-definition imaging of virtual reality display devices (VR display devices). It can meet the requirements of large eye distance while ensuring the small size of the device, so that the virtual reality display device using the near-eye display module can be guaranteed to have the characteristics of small size, which makes it more suitable for users to wear and can improve wearing comfort.

[0072] Furthermore, since the near-eye display module can also have a larger interocular distance (e.g., greater than or equal to 13 mm), it can be adapted to people who wear glasses, allowing users who wear glasses to feel more comfortable when using it. This increases the versatility of the virtual reality display device.

[0073] The near-eye display module proposed in the embodiment of the present application, by introducing a free-form surface in the folded optical path design and adjusting the lens on the side near the human eye (such as the first lens 10 mentioned above) to a cut-edge lens, while controlling the edge thickness difference of the cut-edge lens, can reasonably increase the eye distance without additionally increasing the volume of the entire near-eye display module, which is beneficial to improving the imaging quality; and, to a certain extent, increases the versatility of the virtual reality display device.

[0074] The near-eye display module provided in the embodiment of the present application is a folded optical path, which includes, in addition to an imaging lens group, optical elements such as a spectrometer, a phase delay device, and a polarization reflection element for forming a folded optical path.

[0075] The above-mentioned optical elements (optical films) can be used to form a folded light path between the various lenses of the imaging lens group, so that the light is folded back therein to extend the propagation path of the light, which is conducive to the final clear imaging and at the same time helps to reduce the volume of the entire near-eye display module.

[0076] In the near-eye display module proposed in the embodiments of the present application, the number of lenses used can be flexibly adjusted according to specific needs. Increasing the number of lenses used in the folded optical path can improve the imaging quality of the near-eye display module, but it also affects the size of the near-eye display module along the optical axis (horizontally), resulting in a larger volume and increased weight of the near-eye display module.

[0077] In the embodiment of the present application, considering the volume, weight, imaging quality and production cost of the entire near-eye display module, three lenses are designed in the optical path. Figure 1 Of course, the near-eye display module provided in the embodiment of the present application is not limited to having three lenses disposed therein, and this is only an example.

[0078] It should be noted that when only one lens is provided in the near-eye display module, the lens on the side close to the human eye 01, such as the first lens 10 mentioned above, is designed to have uneven edge thickness, and the ratio of the thickest thickness to the thinnest thickness is controlled to be greater than 1.5 to meet the optical design of a small module size and a large eye distance.

[0079] The light splitting element 50 is, for example, a semi-transparent and semi-reflective film.

[0080] The light splitting element 50 can transmit a portion of light and reflect another portion of light.

[0081] It should be noted that the reflectivity and transmittance of the light-splitting element 50 can be flexibly adjusted according to specific needs, and this is not limited in the embodiments of the present application.

[0082] Optionally, the reflectivity of the light splitting element 50 is 47% to 53%.

[0083] The first phase retarder 60 is, for example, a quarter-wave plate. Of course, the first phase retarder 60 can also be configured as other phase retarder plates such as a half-wave plate as needed.

[0084] In the near-eye display module proposed in the embodiment of the present application, the first phase retarder 60 is provided in the folded light path located near the human eye 01 to change the polarization state of light. For example, it is used to convert linearly polarized light into circularly polarized light, or vice versa.

[0085] The polarized reflective element 70 is, for example, a polarized reflective film / sheet.

[0086] The polarized reflective element 70 is a polarized reflector that reflects horizontally polarized light and transmits vertically polarized light, or a polarized reflector that reflects linearly polarized light at any other specific angle and transmits linearly polarized light perpendicular to the angle.

[0087] In the embodiment of the present application, the first phase retarder 60 and the polarizing reflective element 70 cooperate to analyze and transmit light. The polarizing reflective element 70 has a transmission axis, and the angle between the transmission axis of the polarizing reflective element 70 and the fast axis or slow axis of the first phase retarder 60 is, for example, 45°.

[0088] The three optical elements, the beam splitter 50, the first phase retarder 60, and the polarizing reflective element 70, can be arranged flexibly within the imaging lens assembly. They can be arranged, for example, on one side or both sides of the first lens 10 as needed. However, it must be ensured that the first phase retarder 60 is located between the beam splitter 50 and the polarizing reflective element 70.

[0089] The optical path diagram of the near-eye display module of the embodiment of the present application is shown in Figure 1 The light propagation path is: if the incident light is circularly polarized light, then after the incident light enters the imaging lens group, the incident light can be reflected in the imaging lens group and finally passes through the first lens 10 close to the surface of the human eye 01 (see Figure 1 The second surface 12) shown in the figure is emitted, and finally a high-definition picture with good picture quality can be presented to the human eye 01 on the left.

[0090] In some examples of the present application, the ratio of the eye distance L of the near-eye display module to the total length TTL of the optical system is 0.6 to 0.8; wherein the eye distance L is the distance from the human eye to the first lens 10.

[0091] The optical solution provided in the embodiment of the present application can have a larger eye distance while ensuring that the total length of the optical system is short. It is more suitable for users wearing glasses at a large eye distance, which helps to improve the user experience.

[0092] In some examples of this application, see Figures 9 to 12 The edge of the first lens 10 has at least one lens cutting edge 13, and the lens cutting edge 13 is a straight edge to avoid the wearer's nose bridge area.

[0093] The first lens 10 is, for example, a trimmed lens, and thus has at least one trimmed edge 13 (e.g., a longitudinal trimmed edge). The trimmed edge 13 is, for example, a straight edge. This makes the first lens 10 appear to be a non-circular structure, i.e., an irregular shape.

[0094] The near-eye display module uses a cut-edge lens so that the lens barrel with the cut-edge lens can avoid the user's nose bridge area 02, which is conducive to improving the user's wearing comfort.

[0095] In the above example of the present application, for the imaging lens group that constitutes the near-eye display module, at least one lens can be designed as a cut-edge lens, that is, the outer contour of at least one lens is not a complete circle (with straight edges), and the straight edges should be distributed on the side with greater edge thickness.

[0096] Optionally, when only one edge-cut lens is provided in the imaging lens assembly, the edge-cut lens should be designed to be the lens closest to the human eye 01 , such as the first lens 10 mentioned above.

[0097] See also Figure 9 , Figure 9 The binocular structure shown in FIG is composed of two near-eye display modules. Figure 9 In the direction shown in the figure, the near-eye display module on the left corresponds to the wearer's left eye 011, and the near-eye display module on the right corresponds to the wearer's right eye 012. On the inner side of the wearer's eyes, in order to ensure a smaller pupil distance, the edge of the lens in the dotted box interferes with the wearer's nose bridge area 02. Therefore, it needs to be removed. For example, part of the edge of the first lens 10 can be cut off to form a lens cut edge 13 (that is, a total cut edge, which is a straight edge structure) on the edge of the first lens 10.

[0098] See also Figure 10 The edge of the first lens 10 in the imaging lens assembly is partially removed, and the appearance of the final near-eye display module can be seen in FIG. Figure 11 As shown, the removed portion is the thicker side of the first lens 10 close to the human eye 01.

[0099] See also Figure 12 , Figure 12 The left side of the figure is the state of the imaging module before removing the edge of the first lens 10. The diameter of the first lens 10 is R0, and the minimum distance from the human eye 01 to the first lens 10 closest to the human eye 01 is L0; see Figure 12 On the right side, L1 is the eye distance after the first lens 10 is trimmed. Since the depth of the first lens 10 close to the human eye 01 becomes smaller, the eye distance becomes larger, that is, L0<L1. At the same time, the diameter of the first lens 10 is R1, and R1 is smaller than R0.

[0100] The near-eye display module proposed in the embodiments of this application increases the interocular distance without increasing the size of the near-eye display module, thereby improving the imaging quality of the entire module and increasing the versatility of the virtual reality display system. In other words, the near-eye display module proposed in the embodiments of this application meets the optical design requirements of a large interocular distance while maintaining a small size.

[0101] In some examples of this application, see Figure 1The imaging lens group may further include a second lens 20 and a third lens 30; the first lens 10, the second lens 20 and the third lens 30 are arranged along the same optical axis, wherein the second lens 20 is located between the first lens 10 and the third lens 30; the surface shapes of the second lens 20 and the third lens 30 include free-form surfaces, aspherical surfaces or planes.

[0102] For example, see Figure 1 The imaging lens assembly can be designed to include three optical lenses. In addition to the first lens 10 described above, it also includes a second lens 20 and a third lens 30. The second lens 20 is located between the first lens 10 and the third lens 30 and has the largest outer diameter. The three optical lenses can work together to improve imaging quality.

[0103] Optionally, the second lens 20 and the third lens 30 can also be designed to have free-form surfaces. By introducing more free-form surfaces into the optical path design, the module can be kept compact while maintaining a larger interocular distance and facilitating clear imaging.

[0104] Of course, the second lens 20 and the third lens 30 may also adopt other surface shapes such as aspherical or flat surfaces in consideration of the convenience of film application.

[0105] In addition, it should be noted that the second lens 20 and the third lens 30 can also be configured as trimmed lenses as needed to avoid areas such as the wearer's nose bridge, and this is not limited in the present application.

[0106] It should be noted that, when there is only one edge-cutting lens in the imaging lens assembly, the edge-cutting lens should be arranged on the side close to the human eye 01 .

[0107] In some examples of this application, see Figure 1 , the near-eye display module further includes a display screen 40, and the third lens 30 is located on a side close to the display screen 40;

[0108] The display screen 40 is configured to emit circularly polarized light or natural light; when the light emitted by the display screen 40 is natural light, a superimposed sheet 90 is provided on either side of the third lens 30, which can be used to convert the natural light emitted by the display screen 40 into circularly polarized light.

[0109] The incident light entering the imaging lens assembly should be circularly polarized light.

[0110] When the display screen 40 emits natural light, the polarization state of the natural light needs to be converted first, so that the natural light is first converted into circularly polarized light and then enters the imaging lens group on the left. Finally, the light emitted by the imaging lens group enters the human eye 01 for imaging.

[0111] Optionally, the stacked sheet 90 includes a second phase retarder 92 , a third phase retarder 94 , and a second polarization element 93 between the second phase retarder 92 and the third phase retarder 94 .

[0112] The device for converting natural light into circularly polarized light is the above-mentioned laminated sheet 90. The laminated sheet 90 includes, for example, two phase retarders and a polarizing element disposed between the two phase retarders. Figure 2 The display screen 40 emits natural light, which first passes through a phase retarder (for example, the third phase retarder 94) and remains natural light, then passes through the second polarization element 93 and becomes linearly polarized light, and then passes through another phase retarder (for example, the second phase retarder 92) and becomes circularly polarized light.

[0113] In the stacked plate 90, the two phase retarders are, for example, both quarter-wave plates; one of the quarter-wave plates can be used to adjust the polarization state of light, and the other quarter-wave plate is located on the outermost side and can be used to block a portion of the incident light. Specifically, this portion of light is unwanted light in the imaging. If this portion of light is not blocked, it will be reflected back through the light-emitting surface of the display screen 40 and hit the human eye 01, which is not conducive to the final imaging.

[0114] Alternatively, see Figure 1 The light emitting surface of the display screen 40 is provided with a screen protection glass 41.

[0115] The light emitted from the display screen 40 is transmitted through the screen protection glass 41 on the surface and then enters the laminated sheet 90 to undergo polarization state conversion.

[0116] Optionally, the superimposed sheet 90 is provided on the surface of the third lens 30 away from the display screen 40. Wherein, both surfaces of the third lens 30 are configured as free-form surfaces, for example.

[0117] The stacking sheet 90 is, for example, a composite film formed by sandwiching a polarizing film between two quarter-wave plates. In the embodiment of the present application, the stacking sheet 90 is directly attached to the surface of the third lens 30 using, for example, optical adhesive. This assembly method is simple, reduces production costs, and improves product yield.

[0118] In addition, an anti-reflection film may be provided on both surfaces of the third lens 30 .

[0119] Specifically, see Figure 2 The laminate 90 may further include a second anti-reflection film 91, and the second anti-reflection film 91 is provided on the side of the second phase retarder 92 facing away from the second polarizing element 93. Of course, an anti-reflection film may also be provided on the surface of the third lens 30 close to the display screen 40 (the fifth surface 31).

[0120] Anti-reflective film can reduce reflections, lower reflected energy, and improve light efficiency. Anti-reflective film can be applied to optical components through bonding or coating to form interfaces, increasing transmittance and reducing reflectivity, thereby reducing image distortion and allowing users to enjoy clearer image quality and reduce glare.

[0121] Alternatively, see Figure 1 and Figure 4 A first polarizing element 80 is further provided in the imaging lens group; the beam splitter 50 is provided on either side of the second lens 20, and the first phase retarder 60, the polarizing reflection element 70 and the first polarizing element 80 are sequentially provided between the second lens 20 and the first lens 10.

[0122] The introduction of the first polarization element 80 can be used to reduce stray light.

[0123] In one example, see Figure 1 and Figure 3 The light splitting element 50 is provided on the surface of the second lens 20 close to the display screen 40, and the first phase retarder 60 is provided on the surface of the second lens 20 away from the display screen 40;

[0124] The surface of the second lens 20 close to the display screen 40 is set to be a free-form surface or an aspherical surface; the surface of the second lens 20 away from the display screen 40 is set to be a flat surface or an aspherical surface.

[0125] See 1 and Figure 4 The polarized reflection element 70 and the first polarizing element 80 are stacked and arranged on the surface of the first lens 10 close to the display screen 40; the surface of the first lens 10 close to the display screen 40 is set as an aspherical surface, and the surface of the first lens 10 away from the display screen 40 is set as a free-form surface; or, both surfaces of the first lens 10 are set as free-form surfaces.

[0126] In the above example, the optical elements constituting the folded optical path are mounted on different lenses.

[0127] The beam splitter 50 and the first phase retarder 60 are disposed on two surfaces of the second lens 20, while the polarizing reflective element 70 and the first polarizing element 80 are disposed on one surface of the third lens 30. The beam splitter 50, the first phase retarder 60, and the polarizing reflective element 70 are independently disposed. This allows for greater flexibility in optical path design and facilitates adjustment of the alignment accuracy of the various optical components.

[0128] Of course, the light splitting element 50, the first phase retarder 60 and the polarized reflection element 70 can be respectively arranged on flat glass and then arranged in the optical path as independent devices, which is not limited in the embodiment of the present application.

[0129] The near-eye display module provided in the above example is Figure 1 , the light propagation is as follows:

[0130] The display screen 40 emits natural light, which is transmitted through the screen protection glass 41, becomes circularly polarized light through the overlapping sheet 90, is transmitted through the spectrometer 50 on the surface of the second lens 20, becomes linearly polarized light (P light) through the first phase retarder 60 on the other surface of the second lens 20, is reflected by the polarization reflection element 70 on one surface of the first lens 10, becomes circularly polarized light after passing through the first phase retarder 60, is reflected again by the spectrometer 50, and then becomes linearly polarized light (S light) after passing through the first phase retarder 60. Finally, after being transmitted through the first lens 10, it enters the human eye 01 to display an image.

[0131] In some examples of the present application, the focal length of the first lens 10 is for: The focal length of the second lens 20 for: The focal length of the third lens 30 is for:

[0132] See also Figure 1 The first lens 10 and the second lens 20 can form a lens group, and optical elements forming a folded light path are arranged between the two, so that light can be folded back between the second lens 20 and the first lens 10 to extend the propagation path of the light.

[0133] When the combined optical power of the second lens 20 and the first lens 10 is set to positive, the angle at which the incident light is transmitted through the second lens 20 and the first lens 10 and incident on the polarized reflection element 70 is small, which is conducive to allowing a large amount of light to enter the human eye 01 for imaging.

[0134] The center thickness T1 of the first lens 10 is in the range of 1 mm < T1 < 8 mm, and it includes two optical surfaces. Figure 1 , which are respectively the first surface 11 close to the second lens 20 and the second surface 12 far away from the second lens 20.

[0135] Optionally, the first surface 11 and the second surface 12 can only be designed as free-form surfaces; or, the first surface 11 is set as an aspherical surface, and the second surface 12 is set as a free-form surface.

[0136] When the polarizing reflective element 70 and the first polarizing element 80 are disposed on the first surface 11, an anti-reflection film may also be optionally disposed on the second surface 12. The anti-reflection film on the second surface 12 can reduce reflection, lower reflected energy, and improve light efficiency. The anti-reflection film can also be formed by gluing or coating on the optical components to form interfaces, thereby increasing transmittance and reducing reflectivity, thereby reducing image distortion, allowing users to enjoy clearer image quality and reducing glare.

[0137] The center thickness T2 of the second lens 20 is in the range of 3mm<T2<8mm, and the second lens 20 includes two optical surfaces, namely a third surface 21 close to the third lens 30 and a fourth surface 22 away from the third lens 30, see Figure 1 .

[0138] Alternatively, see Figure 1 The light splitting element 50 can be directly arranged on the third surface 21, and the third surface 21 is designed to be a free-form surface or an aspherical surface, for example.

[0139] Also, see Figure 1 and Figure 3 The first phase retarder 60 is provided on the fourth surface 22. The fourth surface 22 may be a plane or an aspheric surface. The plane or aspheric surface design is more conducive to simplifying the film lamination process.

[0140] In addition, a first anti-reflection film 100 may be selectively disposed on the fourth surface 22 .

[0141] Thus, the first anti-reflection film 100 is also disposed on the fourth surface 22 and can be stacked with the first phase retarder 60. Anti-reflection films can reduce reflections, lower reflected energy, and improve light efficiency. Anti-reflection films can be applied to optical components by gluing or coating to form interfaces, increasing transmittance and reducing reflectivity, thereby reducing image distortion, allowing users to enjoy clearer image quality and reducing glare.

[0142] The central thickness T3 of the third lens 30 is in the range of 1mm<T3<8mm, and it includes two optical surfaces. Figure 1 , which are respectively the fifth surface 31 close to the display screen 40 and the sixth surface 32 away from the display screen 40.

[0143] Optionally, the surface shapes of the fifth surface 31 and the sixth surface 32 may be free-form surfaces, aspherical surfaces, or planes.

[0144] The overlapping sheet 90 may be directly disposed on the sixth surface 32 , and of course may also be disposed on the fifth surface 31 , and this is not specifically limited in the embodiment of the present application.

[0145] By placing the stacking sheet 90 between the display screen 40 and the third lens 30, natural light polarization state conversion is achieved. Natural light emitted from the display screen 40 is converted into circularly polarized light, which then enters the folded optical path structure near the human eye 01 for light folding. Ultimately, the light is emitted through the first lens 10 to form a clear image. This improves the display quality of the near-eye display module, resulting in high-quality images. This enhances the user's viewing experience.

[0146] Optionally, the focal length of the near-eye display module is 10 mm to 25 mm.

[0147] The near-eye display module provided in the embodiment of the present application reasonably controls the focal length under a small volume and a large eye distance. Within the above-mentioned focal length range, it is beneficial for different users to view a clear and complete picture.

[0148] Optionally, the eye distance L of the near-eye display module is: L≥13 mm; wherein the eye distance L is the distance between the human eye 01 and the first lens 10.

[0149] Since the near-eye display module can have a larger interocular distance, for example, greater than or equal to 13 mm, it can be adapted to people who wear glasses, allowing users wearing glasses to have a better sense of comfort when using it, thereby increasing the versatility of virtual reality display devices.

[0150] Optionally, the total length TTL of the optical system of the near-eye display module is: TTL≤23 mm.

[0151] The total optical length of the entire near-eye display module is relatively small, so that the lateral size of the near-eye display module is relatively small, while having excellent imaging performance, which can better enhance the user's wearing comfort and visual experience.

[0152] The imaging lens assembly of the near-eye display module of the present embodiment includes a first lens 10, a second lens 20, and a third lens 30. The refractive index n of the first lens 10, the second lens 20, and the third lens 30 is in the range of 1.4 < n < 1.7; and the chromatic aberration coefficient v of the first lens 10, the second lens 20, and the third lens 30 is in the range of 20 < v < 75. By adjusting the refractive index and chromatic aberration coefficient of the three lenses to match them, the imaging quality of the near-eye display module can be improved.

[0153] In a specific example of the present application, the refractive index of the first lens 10 is 1.54, and the dispersion coefficient is 55.7; the refractive index of the second lens 20 is 1.54, and the dispersion coefficient is 56.3; the refractive index of the third lens 30 is 1.54, and the dispersion coefficient is 56.3.

[0154] The near-eye display module provided by the embodiments of the present application is described in detail below through Example 1 and Example 2.

[0155] Example 1

[0156] See also Figures 1 to 4 The near-eye display module includes an imaging lens assembly and a beam splitter 50, a first phase retarder 60, a polarizing reflective element 70, and a first polarizing element 80 disposed within the imaging lens assembly. The imaging lens assembly includes a first lens 10, a second lens 20, and a third lens 30 along the same optical axis. The third lens 30 is located on one side of a near display screen 40. The first lens 10 is located on one side of a human eye 01. The first lens 10 is a trimmed lens having a trimmed edge 13. The trimmed edge 13 is a straight edge. The edge thickness of the first lens 10 is uneven, so that it includes a thick side and a thin side. The trimmed edge 13 is located on the thick side.

[0157] The first surface 11 of the first lens 10 is an aspheric surface, and the second surface 12 of the first lens 10 is a free-form surface; the third surface 21 of the second lens 20 is a free-form surface, and the fourth surface of the second lens 20 is a plane or an aspheric surface; both surfaces of the third lens 30 are set as free-form surfaces;

[0158] The focal length of the first lens 10 is 685 mm, the focal length of the second lens 20 is 13.7 mm, and the focal length of the third lens 30 is -39 mm;

[0159] The beam splitter 50 is disposed on the third surface 21 of the second lens 20 , the first phase retarder 60 is disposed on the fourth surface 22 of the second lens 20 , and the first polarizing element 80 and the polarizing reflective element 70 are stacked and disposed on the second surface 12 of the first lens 10 ;

[0160] The incident light emitted by the display screen 40 is natural light. A superimposed sheet 90 is provided on the sixth surface 32 of the third lens 30. The superimposed sheet 90 includes a second phase retarder 92, a third phase retarder 94, and a second polarizing element 93 therebetween.

[0161] The distance between the first lens 10 and the human eye 01, i.e., the interocular distance, is 14.5 mm;

[0162] The total length of the optical system of the near-eye display module is 21 mm.

[0163] In Example 1, the ratio of the eye distance L of the near-eye display module to the total length TTL of the optical system is 0.68.

[0164] Tables 1 to 3 show the specific optical parameters of each lens in the near-eye display module provided in this embodiment 1.

[0165] Table 1 Free surface coefficients

[0166] surface Face shape R K A1 A2 12 extendedpolynomial 7.94E+01 1.00E+01 0.00000E+00 -7.52486E-02 21 extendedpolynomial -6.88E+01 -8.03E+00 0.00000E+00 -1.76531E-02 31 extendedpolynomial 1.21176E+01 -1.12165E+00 0.00000E+00 -8.20653E-02

[0167] A3 A4 A5 A6 A7 A8 -1.40303E-02 0.00000E+00 -1.38960E-02 0.00000E+00 1.63199E-05 0.00000E+00 -4.49432E-03 0.00000E+00 -4.45312E-03 0.00000E+00 -9.19814E-08 0.00000E+00 -1.95747E-02 0.00000E+00 -1.79284E-02 0.00000E+00 5.02271E-04 0.00000E+00

[0168] A9 A10 A11 A12 A13 A14 3.86E-05 1.72E-05 0.00E+00 3.51E-05 0.00E+00 1.58E-05 2.12E-06 5.49E-07 0.00E+00 1.10E-06 0.00E+00 3.72E-07 4.74E-04 -1.20E-04 0.00E+00 -2.43E-04 0.00E+00 -1.34E-04

[0169] A15 A16 A17 A18 A19 A20 0.00E+00 -9.48E-08 0.00E+00 -9.02E-08 0.00E+00 1.59E-09 0.00E+00 2.22E-09 0.00E+00 1.43E-08 0.00E+00 1.52E-08 0.00E+00 -1.06E-06 0.00E+00 -2.16E-06 0.00E+00 -1.03E-06

[0170] A21 A22 A23 A24 A25 A26 -2.33E-08 0.00E+00 -6.81E-08 0.00E+00 -6.29E-08 0.00E+00 4.67E-09 0.00E+00 1.43E-08 0.00E+00 1.45E-08 0.00E+00 1.76E-07 0.00E+00 5.15E-07 0.00E+00 5.57E-07 0.00E+00

[0171] A27 A28 A29 A30 A31 A32 -2.62E-08 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.43E-09 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2.12E-07 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0172] A33 A34 A35 A36 A37 A38 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0173] A39 A40 A41 A42 A43 A44 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0174] Table 2 Aspheric coefficients

[0175]

[0176]

[0177] Table 3 Parameters of each lens

[0178] lens Material Lens thickness / mm Lens gap / mm First lens 10 K26R 2.5 0.3 Second lens 20 APEL 6.58 0.3 The third lens 30 APEL 5.87 2.6

[0179] Regarding the near-eye display module provided in the above embodiment 1, its optical performance can be as follows: Figures 5 to 8 As shown: Figure 5 This is a schematic diagram of the point diagram of the near-eye display module. Figure 6 This is the MTF curve of the near-eye display module. Figure 7This is the field curvature distortion diagram of the near-eye display module. Figure 8 This is the vertical axis chromatic aberration diagram of the near-eye display module.

[0180] The point diagram refers to the formation of a diffuse pattern spread over a certain range when many light rays emitted from one point pass through the near-eye display module. Due to aberration, the intersection of the light rays with the image plane is no longer concentrated at the same point. It can be used to evaluate the imaging quality of the near-eye display module. Figure 5 As shown, the maximum value of the image point in the point diagram corresponds to the maximum field of view, and the maximum value of the image point in the point diagram is less than 6m.

[0181] The MTF curve is a modulation transfer function graph that represents the imaging clarity of the near-eye display module through the contrast of black and white line pairs. Figure 6 As shown, the MTF is >0.4 at 60lp / mm, and the image is clear.

[0182] The distortion diagram reflects the difference in image plane position when different fields of view form clear images. Figure 7 As shown in the figure, the maximum distortion occurs in the first field of view, and the absolute value is less than 35%. The field curvature diagram reflects the difference in the image plane position at different fields of view to form a clear image, see Figure 7 , the maximum field curvature occurs near 1 field of view, and the maximum value is less than 0.2mm.

[0183] Vertical axial chromatic aberration is also called chromatic aberration of magnification. It mainly refers to the difference in the focal position of blue light and red light on the image plane when a complex main light on the object side is transformed into multiple light rays due to the dispersion of the refraction system. Figure 8 As shown in the figure, the maximum color difference value of the near-eye display module is less than 160μm.

[0184] Example 2

[0185] See also Figure 13 The near-eye display module includes an imaging lens group and a beam splitter 50, a first phase retarder 60, a polarization reflection element 70, and a first polarization element 80 disposed in the imaging lens group; the imaging lens group includes a first lens 10, a second lens 20, and a third lens 30 along the same optical axis. The third lens 30 is located on a side of the near-eye display screen 40, and the first lens 10 is located on a side of the human eye 01. Figure 18 The first lens 10 is a cut-edge lens, and the first lens 10 has a lens cut edge 13 ( Figure 18 FIG4 shows the shape of the first lens 10 after trimming, wherein the trimmed edge 13 of the lens is a straight edge, and the edge thickness of the first lens 10 is uneven so that it includes a thick side and a thin side, and the trimmed edge 13 of the lens is located on the thick side;

[0186] Both surfaces of the first lens 10 are free-form surfaces; the third surface 21 of the second lens 20 is an aspheric surface, and the fourth surface 22 of the second lens 20 is a plane or an aspheric surface; the fifth surface 31 of the third lens 30 is a free-form surface, and the sixth surface of the third lens 30 is an aspheric surface;

[0187] The focal length of the first lens 10 is 117 mm, the focal length of the second lens 20 is 14 mm, and the focal length of the third lens 30 is -56 mm;

[0188] The beam splitter 50 is disposed on the third surface 21 of the second lens 20 , the first phase retarder 60 is disposed on the fourth surface 22 of the second lens 20 , and the first polarizing element 80 and the polarizing reflective element 70 are stacked and disposed on the second surface 12 of the first lens 10 ;

[0189] The incident light emitted by the display screen 40 is natural light. A superimposed sheet 90 is provided on the sixth surface 32 of the third lens 30. The superimposed sheet 90 includes a second phase retarder 92, a third phase retarder 94, and a second polarizing element 93 therebetween.

[0190] The distance between the first lens 10 and the human eye 01, i.e., the interocular distance, is 15 mm;

[0191] The total length of the optical system of the near-eye display module is 20.1 mm.

[0192] In Example 2, the ratio of the eye distance L of the near-eye display module to the total length TTL of the optical system is 0.71.

[0193] Tables 4 to 6 show the specific optical parameters of each lens in the near-eye display module provided in this embodiment 2.

[0194] Table 4 Free surface coefficients

[0195] surface Face shape R K A1 A2 12 extendedpolynomial 2.49E+01 -3.19E-01 0.00000E+00 6.54404E-02 22 extendedpolynomial -1.72E+01 -2.03E+00 0.00000E+00 0.00000E+00 31 extendedpolynomial 1.78060E+00 -9.94633E-01 0.00000E+00 -1.79557E-03

[0196] A3 A4 A5 A6 A7 A8 -2.52212E-02 0.00000E+00 -2.66863E-02 0.00000E+00 -5.41077E-05 0.00000E+00 1.75630E-02 0.00000E+00 2.00500E-02 0.00000E+00 5.93406E-05 0.00000E+00 -2.06338E-01 0.00000E+00 -2.64553E-01 0.00000E+00 -4.49464E-04 0.00000E+00

[0197] A9 A10 A11 A12 A13 A14 2.89E-05 5.59E-06 0.00E+00 1.21E-05 0.00E+00 2.75E-06 0.00E+00 3.23E-06 0.00E+00 2.64E-06 0.00E+00 3.05E-07 1.41E-04 -1.13E-03 0.00E+00 -7.62E-04 0.00E+00 -1.88E-04

[0198] A15 A16 A17 A18 A19 A20 0.00E+00 1.84E-07 0.00E+00 -1.60E-07 0.00E+00 -7.59E-08 0.00E+00 -1.21E-07 0.00E+00 -5.09E-08 0.00E+00 0.00E+00 0.00E+00 1.41E-06 0.00E+00 5.10E-06 0.00E+00 -3.62E-07

[0199] A21 A22 A23 A24 A25 A26 -7.95E-09 0.00E+00 -1.72E-08 0.00E+00 -6.97E-09 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5.33E-06 0.00E+00 4.05E-06 0.00E+00 3.96E-07 0.00E+00

[0200] A27 A28 A29 A30 A31 A32 -4.20E-10 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 -1.10E-07 0.00E+00 -2.98E-09 0.00E+00 3.96E-08 0.00E+00

[0201] A33 A34 A35 A36 A37 A38 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 -1.86E-08 0.00E+00 -6.34E-11 -7.70E-09 0.00E+00 -9.63E-09

[0202] A39 A40 A41 A42 A43 A44 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0203] Table 5 Aspheric coefficients

[0204]

[0205]

[0206] Table 7 Parameters of each lens

[0207] Lens number Material Lens thickness / mm Lens gap / mm First lens 10 K26R 2.6 0.64 Second lens 20 APEL 6.6 0.6 The third lens 30 APEL 4.4 2.6

[0208] Regarding the near-eye display module provided in the above embodiment 2, its optical performance can be as follows: Figures 14 to 17 As shown: Figure 14 This is a schematic diagram of the point diagram of the near-eye display module. Figure 15 This is the MTF curve of the near-eye display module. Figure 16 This is the field curvature distortion diagram of the near-eye display module. Figure 17 This is the vertical axis chromatic aberration diagram of the near-eye display module.

[0209] The point diagram refers to the formation of a diffuse pattern spread over a certain range when many light rays emitted from one point pass through the near-eye display module. Due to aberration, the intersection of the light rays with the image plane is no longer concentrated at the same point. It can be used to evaluate the imaging quality of the near-eye display module. Figure 14 As shown, the maximum value of the image point in the point diagram corresponds to the maximum field of view, and the maximum value of the image point in the point diagram is less than 6m.

[0210] The MTF curve is a modulation transfer function graph that represents the imaging clarity of the near-eye display module through the contrast of black and white line pairs. Figure 15 As shown, the MTF is >0.35 at 60lp / mm, and the image is clear.

[0211] The distortion diagram reflects the difference in image plane position when different fields of view form clear images. Figure 16 As shown in the figure, the maximum distortion occurs in the first field of view, with an absolute value of less than 40%. The field curvature diagram reflects the difference in the image plane position at different fields of view to form a clear image, see Figure 16 , the maximum field curvature occurs near 1 field of view, and the maximum value is less than 0.2mm.

[0212] Vertical axial chromatic aberration is also called chromatic aberration of magnification. It mainly refers to the difference in the focal position of blue light and red light on the image plane when a complex main light on the object side is transformed into multiple light rays due to the dispersion of the refraction system. Figure 17 As shown in the figure, the maximum color difference value of the near-eye display module is less than 160μm.

[0213] According to another aspect of an embodiment of the present application, a wearable device is further provided, comprising a housing and the near-eye display module as described above.

[0214] The wearable device is, for example, a head-mounted display device.

[0215] The head-mounted display device is, for example, a VR head-mounted device, including VR glasses or a VR helmet, etc., and the embodiments of the present application do not impose specific restrictions on this.

[0216] The specific implementation of the wearable device of the embodiment of the present application can refer to the above-mentioned embodiments of the near-eye display module, 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.

[0217] 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.

[0218] 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 display module, characterized in that: The invention comprises an imaging lens group, and a beam splitter element (50), a first phase retarder (60), and a polarization reflection element (70) arranged in the imaging lens group; wherein the first phase retarder (60) is located between the beam splitter element (50) and the polarization reflection element (70); The imaging lens assembly comprises at least a first lens (10); The first lens (10) has at least one free-form surface, and the edge of the first lens (10) includes a thick side and a thin side according to different thicknesses. The edge thickness of the first lens (10) satisfies: a ratio of a maximum edge thickness H1 to a minimum edge thickness H2 is set to H1 / H2>1.5; The first lens (10) is configured as a cut-edge lens, and the cut edge (13) of the first lens (10) is located on the thick side; The ratio of the eye distance L of the near-eye display module to the total length TTL of the optical system is 0.6 to 0.8; wherein the eye distance L is the distance from the human eye to the first lens (10); The focal length φ1 of the first lens (10) is: 100 mm < φ1 < 800 mm; The focal length of the near-eye display module is 10 mm to 25 mm.

2. The near-eye display module according to claim 1, wherein: The edge of the first lens (10) has at least one lens cutting edge (13), and the lens cutting edge (13) is a straight edge, which is used to avoid the nose bridge area of ​​the wearer.

3. The near-eye display module according to claim 1, wherein: The imaging lens assembly further includes a second lens (20) and a third lens (30); The first lens (10), the second lens (20) and the third lens (30) are arranged along the same optical axis; wherein the second lens (20) is located between the first lens (10) and the third lens (30); The surface shapes of the second lens (20) and the third lens (30) include free-form surfaces, aspherical surfaces or plane surfaces.

4. The near-eye display module according to claim 3, wherein: The near-eye display module further includes a display screen (40), the third lens (30) is located on a side close to the display screen (40), and the display screen (40) is configured to emit circularly polarized light or natural light; When the light emitted by the display screen (40) is natural light, a superimposed sheet (90) is provided on either side of the third lens (30) to convert the natural light emitted by the display screen (40) into circularly polarized light.

5. The near-eye display module according to claim 4, wherein: The stacked plate (90) includes a second phase retarder (92), a third phase retarder (94), and a second polarization element (93) between the second phase retarder (92) and the third phase retarder (94).

6. The near-eye display module according to claim 4, wherein: The stacking sheet (90) is provided on a surface of the third lens (30) away from the display screen (40); Both surfaces of the third lens (30) are configured as free-form surfaces.

7. The near-eye display module according to claim 4, wherein: A first polarizing element (80) is also provided in the imaging lens assembly; The light splitting element (50) is arranged on either side of the second lens (20), and the first phase retarder (60), the polarization reflection element (70) and the first polarization element (80) are arranged in sequence between the second lens (20) and the first lens (10).

8. The near-eye display module according to claim 7, wherein: The light splitting element (50) is provided on a surface of the second lens (20) close to the display screen (40), and the first phase retarder (60) is provided on a surface of the second lens (20) away from the display screen (40); The surface of the second lens (20) close to the display screen (40) is set as a free-form surface or an aspheric surface; the surface of the second lens (20) away from the display screen (40) is set as a plane or an aspheric surface.

9. The near-eye display module according to claim 8, wherein: The polarized reflection element (70) and the first polarizing element (80) are stacked and arranged on a surface of the first lens (10) close to the display screen (40); The surface of the first lens (10) close to the display screen (40) is set as an aspherical surface, and the surface of the first lens (10) away from the display screen (40) is set as a free-form surface; or, Two surfaces of the first lens (10) are configured as free-form surfaces.

10. The near-eye display module according to claim 3, wherein: The focal length φ2 of the second lens (20) is: 10mm<φ2<20mm; The focal length φ3 of the third lens (30) is: -60mm<φ3<60mm.

11. The near-eye display module according to claim 1, wherein: The eye distance L of the near-eye display module is: L≥13 mm; wherein the eye distance L is the distance between the human eye (01) and the first lens (10).

12. The near-eye display module according to claim 11, wherein: The total length TTL of the optical system of the near-eye display module is: TTL≤23mm.

13. A wearable device, characterized in that: include: case; as well as The near-eye display module according to any one of claims 1 to 12.

Images