Diopter adjustable near-eye display optical device

Abstract

This invention discloses a near-eye display optical device with adjustable diopter, comprising: a display unit for providing imaging light; a first lens unit including at least one lens and located on the light-emitting side of the display unit, wherein the first lens unit moves relative to the display unit to achieve focusing or moves synchronously with the display unit to achieve focusing; a plane mirror imaging unit including a first film layer and a flat lens, the flat lens being tilted relative to the display unit, the first film layer being attached to the side of the flat lens near the curved lens, for partially reflecting the focused imaging light to the curved lens and allowing real-world information light to pass through; the curved lens having a first semi-transparent and semi-reflective film for reflecting the received imaging light through the plane mirror imaging unit to the human eye; and a reasonably set focal length range. This allows the device to be compatible with nearsighted individuals of different diopter and ensures the same experience for different pupillary distances and nearsighted individuals, improving user experience and comfort.

Description

Technical Field

[0001] This invention belongs to the field of near-eye display technology, specifically relating to a near-eye display optical device with adjustable diopter. Background Technology

[0002] Augmented Reality (AR) technology overlays virtual information onto real-world information. To achieve this, the designed system must be able to directly perceive real-world information while simultaneously displaying virtual images. Currently, the main industry solutions are either an optomechanical system combined with waveguides or a geometric optics system (primarily the Birdbath solution). The optomechanical system with waveguides uses a display optomechanism paired with optical waveguides for AR display; however, due to current limitations in waveguide technology, significant technological barriers remain to be overcome in terms of display quality and yield. The Birdbath solution offers high color fidelity, contrast, and resolution, enabling the display of rich and varied images within a large field of view (FOV).

[0003] Currently, Birdbath solutions offer two structures: fixed-focus and zoom. Fixed-focus refers to a structure where the virtual image distance of the optical system is limited to a certain distance (typically 2m to 2.5m). At this distance, it's difficult for most nearsighted individuals to directly observe a clear image. Furthermore, wearing glasses directly can cause interference with AR devices or result in image loss due to pupil dilation position shift. Using magnetic prescription lenses can improve display and wearing experience to some extent, but this increases costs. Zoom structures achieve a virtual image distance within a certain range by moving optical lenses, increasing the product's applicability. However, for different virtual image distances, the distance between the fixed and zoom lens groups in the optical system needs to vary within a certain range, resulting in different basic optical performance at different virtual image distances, thus leading to varying experiences for different users. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by proposing a near-eye display optical device with adjustable diopter, which can match nearsighted people with different diopter and ensure the same experience effect for people with different interpupillary distances and nearsightedness, thereby improving the user experience and comfort.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] This invention proposes a near-eye display optical device with adjustable diopter, comprising a display unit, a first lens unit, a plane mirror imaging unit, and a curved lens, wherein:

[0007] The display unit is used to provide imaging light;

[0008] The first lens unit includes at least one lens and is located on the light-emitting side of the display unit. The first lens unit moves relative to the display unit to achieve focusing or moves synchronously with the display unit to achieve focusing.

[0009] The plane mirror imaging unit includes a first film layer and a flat lens. The flat lens is tilted relative to the display unit. The first film layer is attached to the side of the flat lens near the curved lens and is used to partially reflect the imaging light after the first lens unit is focused to the curved lens, and to allow the light of real-world information to pass through.

[0010] The curved lens has a first semi-transparent and semi-reflective film on the side near the first film layer, which is used to reflect the received imaging light through the plane mirror imaging unit to the human eye for imaging.

[0011] And it meets the following conditions:

[0012] 16mm≤f1≤24mm; 24mm≤f2≤40mm; 15mm≤f≤23mm;

[0013] Where f1 is the focal length of the first lens unit, f2 is the focal length of the curved lens, and f is the focal length of the near-eye display optical device with adjustable diopter.

[0014] Preferably, the first film layer includes a first polarization unit and a second polarization unit, the second polarization unit being located between the first polarization unit and the flat lens. The first polarization unit is used to convert circularly polarized light into linearly polarized light, and the second polarization unit is used to transmit polarized light in a first direction and reflect polarized light in a second direction, the first direction being perpendicular to the second direction.

[0015] Preferably, the first polarization unit is a quarter-wave plate, and the second polarization unit is a polarizing reflective film.

[0016] Preferably, the first membrane layer is a second semi-permeable and semi-reflective membrane.

[0017] Preferably, the mirror surfaces of each lens and curved lens are a free combination of spherical, aspherical, and freeform surfaces.

[0018] Preferably, the first lens unit includes a first lens, which is a biconvex aspherical lens or a plano-convex aspherical lens, and the curved lens is a concave-convex aspherical lens. The refractive index of the first lens unit and the curved lens are both 1.45 to 1.65 and the Abbe number is both 20 to 68.

[0019] Preferably, the aspherical mirror surfaces of the first lens unit and the curved lens satisfy the following formula:

[0020]

[0021] Where z is the sag, r is the center height of the lens, k is the conic coefficient, C is the curvature, and ai Let N be the aspherical coefficient of order 2i, and N be a positive integer.

[0022] Preferably, the radii of curvature, k, a2, a3, a4, a5, and a6 of the mirror surface near the display unit on the first lens unit are -20.45 mm, 0.86, 3E-5, -2.65E-7, -1.81E-8, 5.22E-11, and 4.99E-14, respectively, and the radii of curvature, k, a2, a3, a4, a5, and a6 of the mirror surface away from the display unit are 20.58 mm, -0.39, -4.19E-6, -6.86E-8, -3.41E-10, 1.62E-10, and -1.34E-12, respectively. The radii of curvature of the mirror surface near the first coating layer on the curved lens, k, a2, a3, a4, a5, a6 are -60.84mm, 1.06, -1.01E-7, 1.44E-8, -1.50E-10, 3.58E-13, and -7.69E-16, respectively, while the radii of curvature of the mirror surface away from the first coating layer, k, a2, a3, a4, a5, a6, are -62.05mm, 1.01, -1.06E-7, 1.44E-8, -2.58E-10, 1.58E-13, and -6.97E-16, respectively.

[0023] Preferably, the radii of curvature, k, a2, a3, a4, a5, and a6 of the mirror surface near the display unit on the first lens unit are -40.32 mm, -9.68 mm, 6.73E-5 mm, 3.94E-7 mm, -8.32E-8 mm, 5.06E-11 mm, and 1.99E-14 mm, respectively, and the radii of curvature, k, a2, a3, a4, a5, and a6 of the mirror surface away from the display unit are 18.58 mm, -1.05 mm, 2.93E-5 mm, 5.91E-7 mm, -6.37E-9 mm, 1.53E-10 mm, and -1.15E-12 mm, respectively. The radii of curvature of the mirror surface near the first coating layer on the curved lens, k, a2, a3, a4, a5, and a6 are -55.96 mm, 1.21, -1.95E-7, 1.92E-8, -9.01E-11, 3.28E-13, and -8.69E-16, respectively, while the radii of curvature of the mirror surface away from the first coating layer, k, a2, a3, a4, a5, and a6, are -56.85 mm, 0.46, -3.63E-7, 9.14E-9, -2.34E-11, 7.58E-13, and -1.28E-16, respectively.

[0024] Preferably, the display unit is one of an OLED type light-emitting panel, an LED type light-emitting panel, an LCD type non-self-emissive panel, or an LCOS type non-self-emissive panel.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] The purpose of this near-eye display optical device is to provide a Birdbath solution for augmented reality, achieving stable optical performance under adjustable diopter. Specifically, compared to existing Birdbath solutions, this application addresses different myopia groups by adjusting the spacing between components (such as the focusing lens group and the fixed lens group) to change the virtual image distance of the system, thus achieving different diopter ranges, such as -5D to 0D. This eliminates the need for external myopia lenses, matching different myopia groups. Simultaneously, by adjusting parameters and designing the optical path, optimizing the surface shape of the first lens unit 2 and the curved lens 4, and controlling the light data of each field of view, the device ensures that the optical performance, such as field of view, MTF, and distortion, remains essentially consistent under different diopter adjustment configurations. This ensures the same user experience for different interpupillary distances and myopia groups, meeting the needs of various users. The field of view ranges from 40° to 46°, and the entire eye movement range reaches 12mm × 8mm, improving the user experience and comfort. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the near-eye display optical device of the present invention;

[0028] Figure 2 This is a surface distribution diagram of the optical elements of the near-eye display optical device of the present invention;

[0029] Figure 3 This is the MTF chart of refractive power -1D in Embodiment 1 of the present invention;

[0030] Figure 4 This is the MTF chart of diopter-3D in Embodiment 1 of the present invention;

[0031] Figure 5 This is the MTF chart of Example 1 of the present invention with a refractive power of -5D;

[0032] Figure 6 This is a distortion diagram of refractive power -1D in Embodiment 1 of the present invention;

[0033] Figure 7 This is a distortion diagram of refractive power-3D in Embodiment 1 of the present invention;

[0034] Figure 8 This is a distortion diagram of 5D diopter in Embodiment 1 of the present invention;

[0035] Figure 9 This is the MTF chart of refractive power -1D in Embodiment 2 of the present invention;

[0036] Figure 10 This is the MTF chart of diopter-3D in Embodiment 2 of the present invention;

[0037] Figure 11 This is the MTF chart of 5D diopter in Embodiment 2 of the present invention;

[0038] Figure 12 This is a distortion diagram of refractive power -1D in Embodiment 2 of the present invention;

[0039] Figure 13 This is a distortion diagram of refractive power-3D in Embodiment 2 of the present invention;

[0040] Figure 14 This is a distortion diagram of a refractive power of -5D in Embodiment 2 of the present invention.

[0041] Explanation of reference numerals in the attached drawings: 1. Display unit; 2. First lens unit; 3. Plane mirror imaging unit; 4. Curved lens; 5. Human eye; 31. First polarization unit; 32. Second polarization unit; 33. Flat plate lens. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] It should be noted that when a component is referred to as being "connected" to another component, it can be directly connected to the other component or there may be an intervening component. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application.

[0044] like Figure 1-2 As shown, a near-eye display optical device with adjustable diopter includes a display unit 1, a first lens unit 2, a plane mirror imaging unit 3, and a curved lens 4, wherein:

[0045] Display unit 1 is used to provide imaging light;

[0046] The first lens unit 2 includes at least one lens and is located on the light-emitting side of the display unit 1. The first lens unit 2 can be moved relative to the display unit 1 to achieve focusing or can be moved synchronously with the display unit 1 to achieve focusing.

[0047] The plane mirror imaging unit 3 includes a first film layer and a flat lens 33. The flat lens 33 is tilted relative to the display unit 1. The first film layer is attached to the side of the flat lens 33 near the curved lens 4 and is used to partially reflect the imaging light after the first lens unit 2 is focused to the curved lens 4, and to allow the light of real-world information to pass through.

[0048] The curved lens 4 has a first semi-transparent and semi-reflective film on the side near the first film layer, which is used to reflect the received imaging light through the plane mirror imaging unit 3 to the human eye 5 for imaging.

[0049] And it meets the following conditions:

[0050] 16mm≤f1≤24mm; 24mm≤f2≤40mm; 15mm≤f≤23mm;

[0051] Where f1 is the focal length of the first lens unit 2, f2 is the focal length of the curved lens 4, and f is the focal length of the near-eye display optical device with adjustable diopter.

[0052] The purpose of this near-eye display optical device is to provide a Birdbath solution for augmented reality, achieving stable optical performance under adjustable diopter. It includes a display unit 1, a first lens unit 2, a plane mirror imaging unit 3, and a curved lens 4. Light emitted from the display unit 1 is modulated by the first lens unit 2 and then incident on the tilted plane mirror imaging unit 3. The plane mirror imaging unit 3 uses a first film layer for optical modulation and reflects the light to the curved lens 4. The curved lens 4 reflects a portion of the light back to the plane mirror imaging unit 3. Due to the change in light state, the light reflected back to the plane mirror imaging unit 3 by the curved lens 4 will then directly pass through the plane mirror imaging unit 3 and reach the exit pupil (human eye 5).

[0053] The focal length range of the first lens unit 2 is 16mm to 24mm. According to the optimization design requirements and combined with the actual structural support design, the first lens unit 2 can be set as a focusing lens group on its own, in which case the display unit 1 is a fixed lens group, or the first lens unit 2 and the display unit 1 can be set as a focusing lens group as a whole, and the plane mirror imaging unit 3 and the curved lens 4 are fixed lens groups.

[0054] The plane mirror imaging unit 3 uses glass as a substrate (flat lens 33) and is placed at a certain angle (within the range of 30° to 45°). According to actual design requirements, a special film layer can be deposited on it, or optical elements can be selectively attached to it to reflect the light emitted from the first lens unit 2 and transmit the light reflected by the curved lens 4. The optical properties of the film layer or polarization elements are used to realize the reflection and refraction of the light path to ensure the optical display effect.

[0055] The curved lens 4 has a certain curvature. The inner curved surface near the plane mirror imaging unit 3 can adopt an aspherical surface to optimize the optical path. The focal length of the curved lens 4 is in the range of 24mm to 40mm. A semi-transparent and semi-reflective film can be provided on the inner curved surface to reflect part of the light reflected by the plane mirror, forming a refracted optical path. For example, a semi-transparent and semi-reflective film is provided on the side of the curved lens 4 near the first film layer. The semi-transparent and semi-reflective film achieves partial transmission and partial reflection, allowing the user to perceive information from the real world while displaying virtual images. The semi-transparent and semi-reflective film can be implemented by coating or applying a film.

[0056] The focal length of the entire near-eye display optics device ranges from 15mm to 23mm, while the field of view ranges from 40° to 46° to ensure a good user experience. The total eye movement range is 12mm × 8mm. By moving the focusing lens group, diopter adjustment can be achieved within the range of -5D to 0D, meeting the needs of most nearsighted users. Furthermore, by optimizing the surface shape of the first lens unit 2 and the curved lens 4, the optical performance of each focusing configuration can be kept consistent, including characteristics such as FOV, image sharpness, and distortion, ensuring a similar visual experience for different users and improving user experience and comfort.

[0057] In one embodiment, the first film layer includes a first polarization unit 31 and a second polarization unit 32, the second polarization unit 32 being located between the first polarization unit 31 and the flat lens 33. The first polarization unit 31 is used to convert circularly polarized light into linearly polarized light, and the second polarization unit 32 is used to transmit polarized light in a first direction and reflect polarized light in a second direction, the first direction being perpendicular to the second direction.

[0058] In one embodiment, the first polarization unit 31 is a quarter-wave plate, and the second polarization unit 32 is a polarizing reflective film. It is readily understood that the first polarization unit 31 and the second polarization unit 32 can also be replaced with structures having the same function in the prior art.

[0059] In one embodiment, the first film layer is a second semi-transparent and semi-reflective film. By using a semi-transparent and semi-reflective film to achieve partial transmission and partial reflection, the user can perceive information from the real world while simultaneously displaying virtual images. The semi-transparent and semi-reflective film can be implemented through coating or lamination.

[0060] In one embodiment, the mirror surfaces of each lens and the curved lens 4 are a free combination of spherical, aspherical, and freeform surfaces.

[0061] In one embodiment, the first lens unit 2 includes a first lens, which is a biconvex aspherical lens or a plano-convex aspherical lens, and the curved lens 4 is a concave-convex aspherical lens. Both the first lens unit 2 and the curved lens 4 have a refractive index of 1.45–1.65 and an Abbe number of 20–68. It is readily understood that the number of lenses in the first lens unit 2, as well as the mirror shape of each lens and the curved lens 4, can be adjusted according to actual needs. Preferably, the first lens unit 2 includes 1–2 aspherical lenses. The aspherical lenses, based on optimized control results, can adopt a biconvex aspherical configuration or a plano-convex aspherical configuration, and their material can be glass or plastic. In addition to the above-mentioned optional solutions, higher-order degree-of-freedom lens groups or curved lenses can also be used, for example, by replacing them with a structure with a free-form surface.

[0062] In one embodiment, the aspherical surfaces of the first lens unit 2 and the curved lens 4 satisfy the following formula:

[0063]

[0064] Where z is the sag, r is the center height of the lens, k is the conic coefficient, C is the curvature, and a i Let N be the aspherical coefficient of order 2i, and N be a positive integer.

[0065] In one embodiment, the radii of curvature, k, a2, a3, a4, a5, and a6 of the mirror surface on the first lens unit 2 near the display unit 1 are -20.45 mm, 0.86, 3E-5, -2.65E-7, -1.81E-8, 5.22E-11, and 4.99E-14, respectively, while the radii of curvature, k, a2, a3, a4, a5, and a6 of the mirror surface away from the display unit 1 are 20.58 mm, -0.39, -4.19E-6, -6.86E-8, -3.41E-10, 1.62E-10, and -1.34E, respectively. -12; The radii of curvature of the mirror surface near the first coating layer on the curved lens 4, k, a2, a3, a4, a5, a6 are -60.84mm, 1.06, -1.01E-7, 1.44E-8, -1.50E-10, 3.58E-13, and -7.69E-16, respectively, and the radii of curvature of the mirror surface away from the first coating layer, k, a2, a3, a4, a5, a6 are -62.05mm, 1.01, -1.06E-7, 1.44E-8, -2.58E-10, 1.58E-13, and -6.97E-16, respectively.

[0066] In one embodiment, the radii of curvature, k, a2, a3, a4, a5, and a6 of the mirror surface on the first lens unit 2 near the display unit 1 are -40.32 mm, -9.68 mm, 6.73E-5 mm, 3.94E-7 mm, -8.32E-8 mm, 5.06E-11 mm, and 1.99E-14 mm, respectively, while the radii of curvature, k, a2, a3, a4, a5, and a6 of the mirror surface away from the display unit 1 are 18.58 mm, -1.05 mm, 2.93E-5 mm, 5.91E-7 mm, -6.37E-9 mm, 1.53E-10 mm, and -1.15E mm, respectively. -12; The radii of curvature of the mirror surface near the first coating layer on the curved lens 4, k, a2, a3, a4, a5, a6 are -55.96mm, 1.21, -1.95E-7, 1.92E-8, -9.01E-11, 3.28E-13, and -8.69E-16, respectively, and the radii of curvature of the mirror surface away from the first coating layer, k, a2, a3, a4, a5, a6 are -56.85mm, 0.46, -3.63E-7, 9.14E-9, -2.34E-11, 7.58E-13, and -1.28E-16, respectively.

[0067] In one embodiment, the display unit 1 is one of an OLED type light-emitting panel, an LED type light-emitting panel, an LCD type non-self-emissive panel, or an LCOS type non-self-emissive panel. The display unit 1 can be a self-emissive panel (OLED, Organic Light Emitting Display, LED) or a non-self-emissive panel (LCD, Liquid Crystal Display, or LCOS, Liquid Crystal of Silicon). Depending on the display requirements, the display unit 1 can also selectively be fitted with optical elements that aid in the display. For example, a polarizer and a quarter-wave plate can be sequentially fitted to the emitting surface of the display unit 1, with the polarizer located between the emitting surface and the quarter-wave plate. If the display unit 1 is an OLED type light-emitting panel, the emitted light has no polarization state and can be modulated into circularly polarized light by these fitted optical elements. The corresponding first film layer may include a first polarization unit 31 and a second polarization unit 32.

[0068] The technical solution of the present invention is further described below through the introduction of embodiments of the above-described near-eye display optical device. In this description, surface designation 501 indicates the pupil position (i.e., the human eye 5); 402 indicates the mirror surface on the curved lens 4 that is away from the first polarization unit 31; 401 indicates the mirror surface on the curved lens 4 that is close to the first polarization unit 31; 307 indicates the mirror surface on the flat lens 33 that is away from the curved lens 4; 306 indicates the mirror surface on the flat lens 33 that is close to the curved lens 4; 305 and 302 both indicate the mirror surfaces on the second polarization unit 32 that are close to the first polarization unit 31; 304, 303, and 301 all indicate the mirror surfaces on the first polarization unit 31 that are close to the curved lens 4; 202 indicates the mirror surface on the first lens unit 2 that is away from the display unit 1; 201 indicates the mirror surface on the first lens unit 2 that is close to the display unit 1; 102 indicates the exit surface of the display unit 1; and 101 indicates the image exit surface. Specifically, 101 is the image exit surface, i.e., the image surface of the display screen of the display unit 1. In actual use, there will be a protective glass layer on the display screen, so 102 can be the surface of the protective glass near the plane mirror imaging unit 3. If polarizing elements (such as polarizers and quarter-wave plates) are attached to the protective glass, then 102 is the surface of the polarizing elements near the plane mirror imaging unit 3.

[0069] Example 1:

[0070] like Figure 1-2 As shown, this near-eye display optical device is a miniature projection optical engine capable of generating virtual images. Based on the distribution of light rays, it includes a display unit 1, a first lens unit 2, a plane mirror imaging unit 3, and a curved lens 4. The user observes from the exit pupil position (human eye 5) and visually perceives the displayed virtual image. The display unit 1 and the first lens unit 2 are positioned above, while the plane mirror imaging unit 3 is tilted below at a certain angle (e.g., 45°, the specific angle can be adjusted according to actual needs). The curved lens 4 is placed to the right of the plane mirror imaging unit 3, and to the left of the plane mirror imaging unit 3, at the exit pupil position for observation by the human eye 5. This is for descriptive purposes only; the specific orientation is not limited.

[0071] Display unit 1 is a miniature display screen, such as an OLED self-emissive panel. The light emitted from it passes through the first lens unit 2 and reaches the plane mirror imaging unit 3. After passing through the first polarization unit 31 and the second polarization unit 32 attached to the plane mirror imaging unit 3, the light is reflected to the curved lens 4. The inner surface of the curved lens 4 (i.e., the mirror surface near the first polarization unit 31) is coated with a semi-transparent and semi-reflective film. After being reflected by the curved lens 4, the light re-enters the plane mirror imaging unit 3. At this time, the light is transmitted through the first polarization unit 31, the second polarization unit 32, and the flat lens 33 in sequence, reaching the exit pupil of the human eye 5. At the same time, information from the real world can directly reach the human eye 5 through the curved lens 4 and the plane mirror imaging unit 3, thus enabling the augmented reality technology function of this optical system. Through the combination of various optical components, the optical system can achieve an eye movement range of 12mm × 8mm to meet the needs of users with different interpupillary distances.

[0072] To meet the needs of different myopic individuals, in this embodiment, the display unit 1 and the first lens unit 2 are used as a focusing lens group, while the plane mirror imaging unit 3 and the curved lens 4 are used as a fixed lens group. By adjusting the distance between the display unit 1 and the first lens unit 2 and the plane mirror imaging unit 3, different virtual image distances of the emitted image from the optical system are obtained to match the needs of different myopic individuals. The closer the focusing lens group is to the plane mirror imaging unit 3, the shorter the distance of the virtual image formed by the system, which can meet the needs of people with higher degrees of myopia. By adjusting the distance between the focusing lens group and the plane mirror imaging unit 3, the focal length of the entire system varies from 19mm to 23mm when the refractive power is adjusted from -5D to 0D, which can match myopic individuals within the range of -5D to 0D and meet the needs of most people.

[0073] When adjusting the virtual image distance, the focal length of the near-eye display optical device changes due to the varying distance between the focusing lens group and the fixed lens group, resulting in different configurations at different distances. This leads to differences in optical performance between different configurations. Under different configurations, the basic performance of the optical system, including FOV, image sharpness, and distortion, varies to some extent. By adjusting the surface parameters of the first lens unit 2 and the curved lens 4, and optimizing the control of the real ray tracing data for different fields of view in each configuration, the performance of the optical system under different diopter adjustments is made essentially consistent, ensuring that different users have the same visual experience.

[0074] The parameters of each optical element in the near-eye display optical device of this embodiment are shown in Table 1.

[0075] Table 1

[0076] Surface number Surface type Radius of curvature (mm) Thickness (mm) Refractive index Abbe number Refraction mode 501 spherical unlimited 18.50 refraction 307 spherical unlimited 0.60 1.52 64.2 refraction 306 spherical unlimited 0.32 1.49 57.4 refraction 305 spherical unlimited 0.15 1.49 57.4 refraction 304 spherical unlimited 11.00 refraction 401 aspherical -60.84 -11.00 reflection 303 spherical unlimited -0.15 1.49 57.4 refraction 302 spherical unlimited 0.15 1.49 57.4 reflection 301 spherical unlimited 10.45 refraction 202 aspherical 20.58 5.75 1.54 56.3 refraction 201 aspherical -20.45 1.39 refraction 102 spherical unlimited 0.55 1.52 64.2 refraction 101 spherical unlimited 0 refraction

[0077] The surface parameters of each aspherical surface are shown in Table 2.

[0078] Table 2

[0079]

[0080] To realize the refractive optical path in the near-eye display optical device, the eccentric setting of the optical elements is shown in Table 3.

[0081] Table 3

[0082] Surface number 307 304 401 303 301 202 Eccentric type Basic Basic Eccentricity and regression Basic Basic Basic Y-eccentricity (mm) 0 0 -0.35 0 0 -0.28 Alpha eccentricity (°) 45 -45 0 45 45 0

[0083] To achieve a specific eye movement range while simultaneously evaluating the system's optical performance at different eye movement ranges, the thickness of surface 301 varies with different object distances, thereby achieving varying degrees of refractive adjustment. The general optical axis direction (parallel to the right of the paper) is the Z direction, the meridional direction (parallel to the paper upwards) is the Y direction, and the sagittal direction (perpendicular to the paper inwards) is the X direction. Y-eccentricity refers to the translational distance along the Y direction, and Alpha eccentricity refers to the rotation angle around the X-axis.

[0084] Real-world information enters the human eye after being transmitted through the curved lens 4 and the plane mirror imaging unit 3. The parameters of the curved lens 4 in the perspective light path are shown in Table 4. Since the virtual light path (i.e., the light path formed by the light emitted from the display unit) and the real light path (i.e., the light path formed by the light of real-world information) are modeled in opposite directions, the corresponding radii of curvature in the table below are shown as positive values.

[0085] Table 4

[0086] Surface number Surface type Radius of curvature (mm) Thickness (mm) Refractive index Abbe number Refraction mode 402 aspherical 62.05 2 1.52 64.2 refraction 401 aspherical 60.84 11.00 refraction

[0087] The aspherical surface parameters of surface 402 are shown in the table below.

[0088] Table 5

[0089] Surface number Quadratic surface (k) <![CDATA[4th order (a2)]]> <![CDATA[6th order (a3)]]> <![CDATA[8-step (a4)]]> <![CDATA[10th order (a5)]]> <![CDATA[12th order (a6)]]> 402 1.01 -1.06E-7 1.44E-8 -2.58E-10 1.58E-13 -6.97E-16

[0090] In this embodiment, the diagonal field of view can reach 42°. For different virtual image distances, the corresponding diopter can be adjusted while the field of view of the system remains unchanged under different diopters. The results are shown in Table 6.

[0091] Table 6

[0092] diopter -1D -3D -5D Field of view 42.2° 42.2° 42.2°

[0093] Based on the above data, such as Figure 3-8As shown, in this embodiment, f = 22.5 mm. Under different refractive power adjustments, the imaging clarity and distortion of the optical system of this near-eye display optical device are basically consistent. For example, the modulation transfer function (MTF) of all configurations is above 0.1 at a spatial frequency of 25 lp / mm. The actual field of view (FOV) and paraxial field of view (FOV) in the distortion diagram are basically coincident, and the distortion is within 1%.

[0094] Example 2:

[0095] like Figure 1-2 As shown, the architecture and basic principles of this embodiment are basically the same as those of Embodiment 1, and will not be repeated here. However, the system parameter settings are different to achieve different visual effects.

[0096] The parameters of each optical element in the near-eye display optical device of this embodiment are shown in Table 7.

[0097] Table 7

[0098]

[0099]

[0100] The surface parameters of each aspherical surface are shown in Table 8.

[0101] Table 8

[0102] Surface number Quadratic surface (k) <![CDATA[4th order (a2)]]> <![CDATA[6th order (a3)]]> <![CDATA[8-step (a4)]]> <![CDATA[10th order (a5)]]> <![CDATA[12th order (a6)]]> 401 1.21 -1.95E-7 1.92E-8 -9.01E-11 3.28E-13 -8.69E-16 202 -1.05 2.93E-5 5.91E-7 -6.37E-9 1.53E-10 -1.15E-12 201 -9.68 6.73E-5 3.94E-7 -8.32E-8 5.06E-11 1.99E-14

[0103] To realize the refractive optical path in the near-eye display optical device, the eccentric setting of the optical elements is shown in Table 9.

[0104] Table 9

[0105] Surface number 307 304 401 303 301 202 Eccentric type Basic Basic Eccentricity and regression Basic Basic Basic Y-eccentricity (mm) 0 0 -0.35 0 0 -0.28 Alpha eccentricity (°) 45 -45 0 45 45 0

[0106] To achieve a specific eye movement range while simultaneously evaluating the system's optical performance at different eye movement ranges, the thickness of surface 301 varies with different object distances, thereby achieving varying degrees of refractive adjustment. The general optical axis direction (parallel to the right of the paper) is the Z direction, the meridional direction (parallel to the paper upwards) is the Y direction, and the sagittal direction (perpendicular to the paper inwards) is the X direction. Y-eccentricity refers to the translational distance along the Y direction, and Alpha eccentricity refers to the rotation angle around the X-axis.

[0107] Real-world information is also transmitted through curved lens 4 and plane mirror imaging unit 3 before entering the human eye 5. The parameters of curved lens 4 in the perspective light path are shown in Table 10. Since the virtual light path (i.e., the light path formed by the light emitted from the display unit) and the real light path (i.e., the light path formed by the light of real-world information) are modeled in opposite directions, the corresponding radii of curvature in the table below are shown as positive values.

[0108] Table 10

[0109]

[0110] The aspherical surface parameters of surface 402 are shown in Table 11.

[0111] Table 11

[0112] Surface number Quadratic surface (k) <![CDATA[4th order (a2)]]> <![CDATA[6th order (a3)]]> <![CDATA[8th order (a4)]]> <![CDATA[10th order (a5)]]> <![CDATA[12th order (a6)]]> 402 0.46 -3.63E-7 9.14E-9 -2.34E-11 7.58E-13 -1.28E-16

[0113] In this embodiment, the diagonal field of view can reach 44°. For different virtual image distances, the corresponding diopter can be adjusted while the field of view angle changes very little. It is difficult to detect the change in field of view angle between different configurations. The results are shown in Table 12.

[0114] Table 12

[0115] diopter -1D -3D -5D Field of view 44.5° 44.3° 44.0°

[0116] Based on the above data, such as Figure 9-14 As shown, in this embodiment, f = 21.6 mm. Under different refractive power adjustments, the imaging clarity and distortion of the optical system of this near-eye display optical device are basically consistent. For example, the modulation transfer function (MTF) of all configurations is above 0.15 at a spatial frequency of 30 lp / mm. The actual field of view (FOV) and paraxial field of view (FOV) in the distortion diagram are basically coincident, and the distortion is within 1%.

[0117] 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.

[0118] The embodiments described above are merely specific and detailed examples of the embodiments described in this application, and should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A dioptrically adjustable near-eye display optical device, characterized by: The near-eye display optical device with adjustable diopter includes a display unit (1), a first lens unit (2), a plane mirror imaging unit (3), and a curved lens (4), wherein: The display unit (1) is used to provide imaging light; The first lens unit (2) includes at least one lens and is located on the light-emitting side of the display unit (1). The first lens unit (2) moves relative to the display unit (1) to achieve focusing or moves synchronously with the display unit (1) to achieve focusing. The plane mirror imaging unit (3) includes a first film layer and a flat lens (33). The flat lens (33) is tilted relative to the display unit (1). The first film layer is attached to the side of the flat lens (33) near the curved lens (4) and is used to partially reflect the imaging light after the first lens unit (2) is focused to the curved lens (4) and to allow real-world information light to pass through. The curved lens (4) has a first semi-transparent and semi-reflective film on the side near the first film layer, which is used to reflect the received imaging light through the plane mirror imaging unit (3) to the human eye (5) for imaging. And it meets the following conditions: 21.27894mm<f1≤24mm; 24mm≤f2≤40mm; 15mm≤f≤23mm; Wherein, f1 is the focal length of the first lens unit (2), f2 is the focal length of the curved lens (4), and f is the focal length of the near-eye display optical device with adjustable diopter. The mirror surfaces of each of the lenses and curved lenses (4) are free combinations of spherical, aspherical, and freeform surfaces; The first lens unit (2) includes a first lens, which is a biconvex aspherical lens, and the curved lens (4) is a concave-convex aspherical lens; The aspherical mirrors of the first lens unit (2) and the curved lens (4) satisfy the following formula: wherein z is the sag, r is the center height of the lens, k is the conic constant, C is the curvature, is the 2i-th aspherical coefficient, and N is a positive integer. The radius of curvature, k, of the mirror surface of the first lens unit (2) near the display unit (1) , , , , The values ​​are -40.32mm, -9.68, 6.73E-5, 3.94E-7, -8.32E-8, 5.06E-11, and 1.99E-14, respectively, representing the radius of curvature of the mirror surface away from the display unit (1), k, and so on. , , , , The values ​​are 18.58mm, -1.05, 2.93E-5, 5.91E-7, -6.37E-9, 1.53E-10, and -1.15E-12, respectively; the radius of curvature, k, of the mirror surface near the first film layer on the curved lens (4) , , , , The values ​​are -55.96mm, 1.21, -1.95E-7, 1.92E-8, -9.01E-11, 3.28E-13, and -8.69E-16, respectively, representing the radius of curvature of the mirror surface away from the first film layer, k, and... , , , , The values ​​are -56.85mm, 0.46, -3.63E-7, 9.14E-9, -2.34E-11, 7.58E-13, and -1.28E-16, respectively.

2. The near-eye display optical device with adjustable diopter as described in claim 1, characterized in that: The first film layer includes a first polarization unit (31) and a second polarization unit (32). The second polarization unit (32) is located between the first polarization unit (31) and the flat lens (33). The first polarization unit (31) is used to convert circularly polarized light into linearly polarized light. The second polarization unit (32) is used to transmit polarized light in a first direction and reflect polarized light in a second direction. The first direction is perpendicular to the second direction.

3. The near-eye display optical device with adjustable diopter as described in claim 2, characterized in that: The first polarization unit (31) is a quarter-wave plate, and the second polarization unit (32) is a polarizing reflective film.

4. The near-eye display optical device with adjustable diopter as described in claim 1, characterized in that: The first membrane layer is a second semi-permeable and semi-reflective membrane.

5. The near-eye display optical device with adjustable diopter as described in claim 1, characterized in that: The refractive index of the first lens unit (2) and the curved lens (4) are both 1.45~1.65 and the Abbe number is both 20~68.

6. The near-eye display optical device with adjustable diopter as described in claim 1, characterized in that: The display unit (1) is one of OLED type light-emitting panel, LED type light-emitting panel, LCD type non-self-emitting panel, or LCOS type non-self-emitting panel.

Images