Optical module and near-to-eye display equipment

Abstract

The utility model relates to an optical module and near-to-eye display equipment. The optical module comprises a first lens, a second lens and related film layers attached to the near-to-eye side and the far-to-eye side of the second lens. The focal power of the first lens and the focal power of the second lens are positive, the side, far away from the human eye, of the first lens is an aspheric surface with an inflection point, the second lens and the first lens are arranged at intervals, the side, near the human eye, of the second lens is a concave surface, and the side, far away from the human eye, of the second lens is a convex surface; a first quarter-wave plate and a polarization reflection film are sequentially attached to the side, close to the human eye, of the second lens from far to near, and a light splitting film, a second quarter-wave plate and a first polarization film are sequentially attached to the side, far away from the human eye, of the second lens from near to far. The polarization reflection film is used for transmitting the first linearly polarized light and reflecting the second linearly polarized light perpendicular to the polarization direction of the first linearly polarized light, and the fast axis of the first quarter-wave plate is perpendicular to the fast axis of the second quarter-wave plate. According to the optical module, the problem that the definition of a picture seen when human eyes rotate in a wide view field is reduced can be solved.

Description

Technical Field

[0001] This utility model relates to the field of near-eye display technology, and in particular to an optical module and a near-eye display device. Background Technology

[0002] With advancements in display and optical technologies, increased computing power, the driving force of the consumer electronics market, and the support of emerging technologies such as 5G and AI, near-eye display devices have been widely used in numerous fields, becoming an important platform for human-computer interaction. The optical system is one of the core components of near-eye display devices, directly affecting the user's visual experience and the overall performance of the device.

[0003] The design optimization of near-eye display optical systems typically focuses on maximizing the viewing angle and performance from a fixed viewpoint. However, in actual use, the human eye's high-definition viewing angle is limited, requiring eye movement to perceive a wider field of view. This means the eye's fixation angle changes when viewing the entire display image. The conventional fixed-viewpoint optimization design of near-eye display optical systems neglects the performance requirements caused by eye movement. Consequently, eye movement during actual use leads to decreased clarity at wider viewing angles, significantly reducing the user experience. Utility Model Content

[0004] Given the poor viewing angle clarity of existing near-eye display devices in wide-viewing-angle usage scenarios, it is necessary to provide an optical module and a near-eye display device.

[0005] An optical module comprising, arranged sequentially from near to far and coaxially:

[0006] A first lens, having positive optical power, wherein the distal end of the first lens is an aspherical surface with a point of inflection; and

[0007] The second lens has positive optical power. The side of the first lens closest to the human eye is concave, while the side furthest from the human eye is convex. On the side of the second lens closest to the human eye, a first quarter-wave plate and a polarizing reflective film are sequentially attached from far to near. On the side of the second lens furthest from the human eye, a beam-splitting film is attached. On the side of the beam-splitting film furthest from the human eye, a second quarter-wave plate and a first polarizing film are sequentially attached from near to far. The polarizing reflective film is used to transmit first linearly polarized light and reflect second linearly polarized light perpendicular to the polarization direction of the first linearly polarized light. The fast axis of the second quarter-wave plate is perpendicular to the fast axis of the first quarter-wave plate.

[0008] In one embodiment, a third quarter-wave plate is further attached to the eye-distant side of the first polarizing film, wherein the fast axis of the third quarter-wave plate extends in the same direction as the fast axis of the second quarter-wave plate.

[0009] In one embodiment, a second polarizing film is also attached to the eye-proximity side of the polarizing reflective film. The second polarizing film is used to transmit the first linearly polarized light and block the second linearly polarized light.

[0010] In one embodiment, the first lens and the second lens are arranged at intervals.

[0011] In one embodiment, the side of the first lens that is far from the human eye is planar.

[0012] In one embodiment, the far-eye side of the first lens is cemented to the near-eye side of the second lens, and the near-eye side of the first lens is concave.

[0013] In one embodiment, the system focal length F of the optical module satisfies: 10mm≤F≤25mm, the focal length f1 of the first lens satisfies: |f1|≥2F, and the focal length f2 of the second lens satisfies: 5F≤f2≤7F.

[0014] In one embodiment, the eye distance of the optical module ranges from 11 mm to 28 mm.

[0015] The optical module provided in this application, by constraining the optical power and surface shape of the first and second lenses, especially the recurved design of the far-eye side of the first lens, can divide the optical path into partitions corresponding to different viewing angles in the optical module. This makes the transition between the images of multiple fields of view seen by the human eye when rotating, and the image quality seen by the human eye is relatively stable at each viewing angle, which is beneficial to improving the immersive experience of near-eye display devices. By arranging relevant film layers on the near-eye side and far-eye side of the second lens to achieve optical path folding, the length of the entire optical module along the optical axis is shortened. The optical path folding is achieved through a single lens, which reduces the sensitivity of the entire optical path system and enables the lens assembly to meet the precision requirements.

[0016] This application also provides a near-eye display device, comprising:

[0017] Such as the optical module mentioned above;

[0018] The aperture plane is located within the viewing distance range of the optical module; and

[0019] The image display element is located on the far eye side of the optical module;

[0020] The thickness T of the near-eye display device satisfies: 15mm≤T≤25mm.

[0021] In one embodiment, the aperture surface includes multiple sub-aperture regions with different viewing directions D, and the field of view of each sub-aperture region is D±θ, where θ≤20°. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a near-eye display device according to an embodiment of the present invention;

[0023] Figure 2 for Figure 1 The diagram shows the optical path of a near-eye display device.

[0024] Figure 3 for Figure 2 The diagram shows the optical path of a near-eye display device when the viewing angle is 0°.

[0025] Figure 4 for Figure 2 The diagram shows the optical path of a near-eye display device when the viewing angle is 15°.

[0026] Figure 5 for Figure 2 The diagram shows the optical path of a near-eye display device at a viewing angle of 25°.

[0027] Figure 6 MTF chart of the near-eye display device at a gaze angle of 0° in the embodiments provided in this application;

[0028] Figure 7 MTF chart of the near-eye display device at a viewing angle of 15° in the embodiments provided in this application;

[0029] Figure 8 MTF chart of the near-eye display device at a gaze angle of 25° in the embodiments provided in this application;

[0030] Figure 9 This is a schematic diagram of the near-eye display device in another embodiment provided in this application.

[0031] Figure label:

[0032] L1, first lens; L2, second lens; P1, first polarizing film; P2, second polarizing film; Q1, first quarter-wave plate; Q2, second quarter-wave plate; Q3, third quarter-wave plate; RP1, polarizing reflective film; BS1, beam splitter. Detailed Implementation

[0033] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0039] Please see Figures 1 to 5 , Figure 1 This is a schematic diagram of the near-eye display device according to one embodiment of the present invention. Figure 2 for Figure 1 The diagram shows the optical path of a near-eye display device. Figure 3 for Figure 2 The diagram shows the optical path of a near-eye display device when the viewing angle is 0°. Figure 4 for Figure 2 The diagram shows the optical path of a near-eye display device at a viewing angle of 15°. Figure 5 for Figure 2 The diagram shows the optical path of a near-eye display device at a viewing angle of 25°.

[0040] like Figure 1 As shown, the near-eye display device includes an optical module, an aperture surface located within the eye-to-eye distance range of the optical module, and an image display element located on the far-eye side of the optical module. The thickness T of the near-eye display device satisfies: 15mm≤T≤25mm.

[0041] like Figure 1 and Figure 2As shown, specifically, the optical module includes a first lens L1, a second lens L2, and related films attached to the near-eye side and the far-eye side of the second lens L2; ​​the optical power of the first lens L1 and the second lens L2 are both positive; the far-eye side of the first lens L1 is an aspherical surface with a curvature point; the second lens L2 is arranged alternately with the first lens L1; the near-eye side of the second lens L2 is concave and the far-eye side is convex; the near-eye side of the second lens L2 is attached with a first quarter-wave plate Q1 and a polarizing reflective film RP1 in sequence; the far-eye side of the second lens L2 is attached with a beam splitter BS1; the far-eye side of the beam splitter BS1 is attached with a second quarter-wave plate Q2 and a first polarizing film P1 in sequence; the polarizing reflective film RP1 is used to transmit first linearly polarized light and reflect second linearly polarized light perpendicular to the polarization direction of the first linearly polarized light; the fast axis of the first quarter-wave plate Q1 is perpendicular to the fast axis of the second quarter-wave plate Q2.

[0042] Based on the optical module provided by the above-described embodiments, by constraining the optical power and surface shape of the first lens L1 and the second lens L2, especially the recurved design of the far-eye side of the first lens L1, the optical path can be divided into partitions corresponding to different viewing angles in the optical module. This makes the transition between the images of multiple fields of view seen by the human eye uniform when rotating, and the image quality seen by the human eye is relatively stable at each viewing angle, which is beneficial to improving the immersive experience of near-eye display devices. By arranging relevant film layers on the near-eye side and the far-eye side of the second lens L2 to achieve folding of the optical path, the length of the entire optical module along the optical axis is shortened. The optical path folding is achieved through a single lens, which reduces the sensitivity of the entire optical path system and allows the lens assembly to meet the precision requirements.

[0043] For example, such as Figures 3 to 5As shown in this application, the portion from the inflection point on the lens to the optical axis is defined as the paraxial region of the lens, and the remaining portion is defined as the far-axis region. The optical path in this optical module is mainly divided into three parts. The first part of the light rays passes through the paraxial regions of the second lens L2 and the first lens L1 sequentially towards the aperture surface. The second part of the light rays deviates from the optical axis and passes through the boundary region between the paraxial and far-axis regions of the second lens L2 and the first lens L1 sequentially towards the aperture surface. The third part of the light rays deviates the farthest from the optical axis and passes through the far-axis regions of the second lens L2 and the first lens L1 sequentially towards the aperture surface. These three parts of the light rays correspond to the light rays emitted from different areas of the image display element, and each corresponds to a sub-aperture region at the aperture surface. It is worth noting that, for ease of description, this application artificially selects three specific viewing angles to partition the optical path in the optical module. In practice, other viewing angles can also be selected to re-partition the optical path, so the number of sub-aperture regions can also be multiple, two or more. Due to the characteristics of eye rotation, each sub-aperture region is symmetrical about the optical axis, and multiple sub-aperture regions can partially overlap or separate.

[0044] Based on the above optical module architecture, in order to obtain an optical path that matches the range of eye rotation angles and take into account the overall thickness of the optical module, this application also constrains the focal length of each lens in the optical module. The system focal length F of the optical module satisfies: 10mm≤F≤25mm, the focal length f1 of the first lens L1 satisfies: |f1|≥2F, and the focal length f2 of the second lens L2 satisfies: 0.5F≤f2≤2F.

[0045] Optionally, in this embodiment, the beam splitter BS1, the second quarter-wave plate Q2, the first polarizing film P1, and the third quarter-wave plate Q3 are sequentially bonded together. This fixes the relative positions between the film layers, which helps to further reduce the sensitivity of the entire system. It is understood that in other embodiments, if only to achieve optical path folding, the composite film layer composed of the second quarter-wave plate, the first polarizing film, and the third quarter-wave plate can also be bonded to the glass of the image display element, which can also reduce the difficulty of processing and production.

[0046] Preferably, in some embodiments of this application, a second polarizing film P2 is also attached to the eye-proximity side of the polarizing reflective film RP1. The second polarizing film P2 is used to filter the second linearly polarized light (S-light), which can avoid the problem of screen glare caused by light leakage from the polarizing reflective film RP1 or the beam splitter BS1 and the internal reflection stray light in the lens.

[0047] Preferably, in some embodiments of this application, the third film layer further includes a third quarter-wave plate Q3 attached to the first polarizing film P1, wherein the fast axis of the third quarter-wave plate Q3 extends in the same direction as the fast axis of the second quarter-wave plate Q2.

[0048] Optionally, in the embodiments provided in this application, the side of the first lens L1 that is far from the human eye is flat, which facilitates processing, improves production yield, and facilitates the application of other film layers (such as AR film).

[0049] In order to reduce the weight of the optical module and near-eye display device, in the embodiments provided in this application, the first lens L1 and the second lens L2 are made of APL plastic, specifically APL5013VH, a material with high refractive index and low birefringence.

[0050] Optionally, in the embodiments provided in this application, the first lens L1 and the second lens L2 are arranged at intervals, so that the surface design of the first lens L1 on the far side of the human eye is more flexible, which is beneficial to correcting problems such as image distortion and color difference.

[0051] Optional, such as Figure 9 As shown, Figure 9 The diagram below shows the structure of an optical module in another embodiment of this application. In this optical module, the eye-far side of the first lens L1 is bonded to the eye-near side of the second lens L2, and the eye-near side of the first lens L1 is concave. The bonding method increases the structural stability of the entire optical module after assembly, which is beneficial to further reduce the sensitivity of the entire optical path system and improve the assembly accuracy.

[0052] For example, in the embodiments provided in this application, the transmission axis pol of the first polarizing film P1 is 0°, the transmission axis pol of the second polarizing film P2 is 90°, the fast axis direction of the first quarter-wave plate Q1 is 135°, the fast axis directions of the second quarter-wave plate Q2 and the third quarter-wave plate Q3 are both 45°, and the polarizing reflective film RP1 reflects the second linearly polarized light (S-ray) and transmits the first linearly polarized light (P-ray). For the sake of simplicity, P-ray represents the first linearly polarized light, S-ray represents the second linearly polarized light, C-ray represents circularly polarized light, LC-ray represents left-handed circularly polarized light, and RC-ray represents right-handed circularly polarized light. Based on the film structure and the optical power and surface design of the first to second lenses L2, the optical path between the image display element and the aperture surface is as follows: The light emitted by the image display element includes P light and S light. After passing through the third quarter-wave plate Q3, the two types of light are converted into C light. The C light continues to pass through the first polarizing film P1 and is converted into S light. The S light then passes through the second quarter-wave plate Q2 and is converted into LC light. The LC light passes through the beam splitting film BS1 and the second lens L2 in sequence and is converted into S light by the first quarter-wave plate Q1. Then, it is reflected twice at the polarizing reflection film RP1 and the beam splitting film BS1. It is worth noting that the S light is converted into P light after passing through the first quarter-wave plate Q1 twice and exits from the second polarizing film P2, finally reaching the aperture surface.

[0053] In the embodiments provided in this application, the eye-to-eye distance range of the optical module is 11mm to 28mm. Within this range, it is convenient to adapt to the rotation of the eyeball by adjusting the surface shape and focal length of the first to second lenses L2, and the thickness of the lenses is also small, reducing the difficulty of lens manufacturing.

[0054] The optical module and near-eye display device provided in this embodiment will be further described below with reference to the attached table. The optical design parameters of the near-eye display device in this embodiment are shown in Table 1.

[0055] Table 1 Optical Design Parameters

[0056]

[0057] In the table, OBJ represents the relevant design parameters of the object surface; STO represents the aperture of the optical module, with an aperture diameter of 4mm; for simplicity, Si will be used below to represent the surface number of the lens through which light propagates in the optical module, and the numbers in the first column of the table represent the serial number i in the surface number. S2 has no special meaning and is only used to describe the distance between the aperture surface and the first lens L1; S3 and S4 represent the near-eye side and far-eye side of the first lens L1, respectively; S5 and S6 represent the near-eye side and far-eye side of the second lens L2, respectively; S11 represents the glass layer of the display plane in the image display element 10; S12 represents the image of the image display element 10; EVENASPH in the table represents an aspherical surface. It is worth noting that the thickness data in the row containing S7 is negative, indicating that light has been reflected. In this embodiment, the focal length of the first lens is f1 = 55mm, and the focal length of the second lens is f2 = 97mm.

[0058] The formula for calculating aspherical surfaces is:

[0059]

[0060] In the above formula, x represents the distance vector from the aspherical surface at a height of h to the vertex of the aspherical surface along the optical axis, c represents the curvature, h represents the radial distance from the optical axis, k represents the conic coefficient, and Ai represents the i-th order aspherical coefficient. The aspherical coefficients in the optical module are shown in Table 2.

[0061] Table 2 Aspheric coefficients in optical modules

[0062]

[0063] Other parameters of the near-eye display device in this embodiment are shown in Table 3.

[0064] Table 3 Other parameters of the optical module

[0065] Screen size C (inches) 1.35 Field of view V (°) 90 System focal length F (mm) 17.5 Eyebox eye movement range A (mm) 10 Screen resolution 1772＊1920 Optical system thickness (mm) 19 Eye relif (mm) 20 F# Aperture 43 Optical outer diameter (mm) 40 System distortion 15

[0066] As can be seen from Table 3, based on the relevant parameters in Table 1, the system focal length F of the optical module is 17.5mm, and the optical system focal length is 19mm, thus achieving a 90° field of view. By setting the aperture in front of the optical module to 4.3, a 10mm eye movement range can be obtained.

[0067] The screen is designed to be 1.35 inches in size with a viewing distance of 20mm, and the optical module has an outer diameter of 38mm. Figures 6 to 8 As shown in the MTF plot. Figure 6 This is the MTF diagram of the near-eye display device in the embodiments provided in this application at the first viewing angle (D = 0°). Figure 7 The MTF diagram of the near-eye display device in the embodiments provided in this application at the second viewing angle (D = 15°) is shown. Figure 8 The MTF diagram of the near-eye display device in the embodiments provided in this application at the third viewing angle (D = 25°) shows that the optical module exhibits good resolution and uniform transition of the field of view at different viewing angles, providing users with good image quality and immersion. It is worth noting that the use of viewing angles of D = 0°, 15°, and 25° as examples does not imply that the optical module only has three viewing directions. In reality, the number of sub-aperture regions can be two or more, and the field of view range of the sub-aperture regions can be appropriately scaled and adjusted adaptively as needed.

[0068] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An optical module characterized by comprising: The optical module comprises, arranged in order from near to far and sharing an optical axis: a first lens having positive refractive power, the far human eye side of the first lens being an aspheric surface having a point of inflection; and a second lens having positive refractive power, the near human eye side of the first lens being a concave surface and the far human eye side being a convex surface, the near human eye side of the second lens being sequentially provided, from far to near, with a first quarter-wave plate and a polarized reflection film, the far human eye side of the second lens being provided with a light splitting film, the far human eye side of the light splitting film being sequentially provided, from near to far, with a second quarter-wave plate and a first polarized film, the polarized reflection film being configured to transmit first linearly polarized light and reflect second linearly polarized light perpendicular to the polarization direction of the first linearly polarized light, the fast axis of the second quarter-wave plate being perpendicular to the fast axis of the first quarter-wave plate.

2. The optical module according to claim 1, wherein The far human eye side of the first polarized film is further provided with a third quarter-wave plate, the extension direction of the fast axis of the third quarter-wave plate being the same as the extension direction of the fast axis of the second quarter-wave plate.

3. The optical module according to claim 1, wherein The near human eye side of the polarized reflection film is further provided with a second polarized film, the second polarized film being configured to transmit first linearly polarized light and block second linearly polarized light.

4. The optical module according to claim 1, wherein The first lens and the second lens are arranged at intervals.

5. The optical module according to claim 1, wherein The far human eye side of the first lens is a plane.

6. The optical module according to claim 1, wherein The far human eye side of the first lens is cemented to the near human eye side of the second lens, and the near human eye side of the first lens is a concave surface.

7. The optical module according to any one of claims 1 to 6, wherein The system focal length F of the optical module satisfies: 10mm≤F≤25mm, the focal length f1 of the first lens satisfies: |f1|≥2F, and the focal length f2 of the second lens satisfies: 5F≤f2≤7F.

8. The optical module according to any one of claims 1 to 6, wherein The eye relief range of the optical module is 11mm-28mm.

9. A near-eye display device, comprising: The optical module comprises: the optical module according to any one of claims 1-8; a stop surface located within the eye relief range of the optical module; and an image display element located on the far human eye side of the optical module; The thickness T of the near-eye display device satisfies: 15mm≤T≤25mm.

10. The near-eye display device of claim 9, wherein, The stop surface comprises a plurality of sub-stop regions having different gaze directions D, and the field of view angle range of each sub-stop region is D±θ, wherein θ≤20°. The optical module comprises, arranged in order from near to far and sharing an optical axis: a first lens having positive refractive power, the far human eye side of the first lens being an aspheric surface having a point of inflection; and a second lens having positive refractive power, the near human eye side of the first lens being a concave surface and the far human eye side being a convex surface, the near human eye side of the second lens being sequentially provided, from far to near, with a first quarter-wave plate and a polarized reflection film, the far human eye side of the second lens being provided with a light splitting film, the far human eye side of the light splitting film being sequentially provided, from near to far, with a second quarter-wave plate and a first polarized film, the polarized reflection film being configured to transmit first linearly polarized light and reflect second linearly polarized light perpendicular to the polarization direction of the first linearly polarized light, the fast axis of the second quarter-wave plate being perpendicular to the fast axis of the first quarter-wave plate. The far human eye side of the first polarized film is further provided with a third quarter-wave plate, the extension direction of the fast axis of the third quarter-wave plate being the same as the extension direction of the fast axis of the second quarter-wave plate. The near human eye side of the polarized reflection film is further provided with a second polarized film, the second polarized film being configured to transmit first linearly polarized light and block second linearly polarized light. The first lens and the second lens are arranged at intervals. The far human eye side of the first lens is a plane. The far human eye side of the first lens is cemented to the near human eye side of the second lens, and the near human eye side of the first lens is a concave surface. The system focal length F of the optical module satisfies: 10mm≤F≤25mm, the focal length f1 of the first lens satisfies: |f1|≥2F, and the focal length f2 of the second lens satisfies: 5F≤f2≤7F. The eye relief range of the optical module is 11mm-28mm. The optical module comprises: the optical module according to any one of claims 1-8; a stop surface located within the eye relief range of the optical module; and an image display element located on the far human eye side of the optical module; The thickness T of the near-eye display device satisfies: 15mm≤T≤25mm. The stop surface comprises a plurality of sub-stop regions having different gaze directions D, and the field of view angle range of each sub-stop region is D±θ, wherein θ≤20°.

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