Head-mounted display optical system based on liquid crystal lens and head-mounted display device

Abstract

This invention relates to a head-mounted display optical system and head-mounted display device based on a liquid crystal lens. The head-mounted display optical system includes an image source unit, a lens unit, a beam splitter unit, a curved mirror unit, an eye-tracking unit, a convergence-adjustable liquid crystal lens unit, a first diopter-adjustable liquid crystal lens unit, and a control unit. Its advantages are: by setting up the convergence-adjustable liquid crystal lens unit, a variable focus anti-dizziness function can be achieved; with the assistance of the eye-tracking unit, the focal length of the convergence-adjustable liquid crystal lens unit can be adjusted to change the display depth of the virtual image source of the image source unit, thereby achieving an anti-dizziness effect; by utilizing the real-time tracking of the eye-tracking unit, the focal length of the convergence-adjustable liquid crystal lens unit can be dynamically adjusted in real time, thereby reducing fatigue caused by prolonged wear; and by utilizing the first diopter-adjustable liquid crystal lens unit, the vision of nearsighted users can be corrected, allowing normal use of the head-mounted display optical system without the need for additional nearsighted glasses.

Description

Technical Field

[0001] This invention relates to the field of technology, and more particularly to a head-mounted display optical system, head-mounted display device, display method, computer equipment, and computer-readable storage medium based on a liquid crystal lens. Background Technology

[0002] In the field of augmented reality devices (such as AR glasses and AR helmets), the BirdBath optical module is commonly used due to its high image quality and low cost. However, augmented reality devices using the BirdBath optical module generally suffer from the following problems:

[0003] 1) The left and right eye 3D stereoscopic display structure can cause radial vertigo;

[0004] 2) It is not very user-friendly for nearsighted or farsighted users, as they need to wear augmented reality devices on top of their existing nearsighted or farsighted glasses, resulting in a heavier and bulkier overall weight.

[0005] Problems 1) and 2) are generally addressed as two separate issues, that is, by adding different structures to existing augmented reality devices to address problems 1) and 2) respectively.

[0006] Regarding question 1), no BirdBath-based AR solution has yet been found to address this issue. Existing solutions only appear in waveguide-based AR products. These solutions typically use multiple waveguide combinations to create a dual-plane effect in an attempt to solve the dizziness problem. Each waveguide consists of three layers (one for each of the RGB colors), displaying images at different focal lengths and depths. The biggest problem with this solution is that the optical module composed of two waveguides is relatively thick and heavy, and there is interlayer interference, resulting in poor image quality.

[0007] For question 2), a common solution is to pre-install a bracket in the optical module to accommodate a removable and replaceable refractive lens, allowing users to customize the lens. This solution increases user costs, requiring users to order additional refractive lenses. Because different users have different refractive errors, these lenses cannot be mass-produced alongside AR glasses.

[0008] In addition, other solutions adjust the distance between the virtual image source and the BB lens to achieve myopia correction. Users can adjust the relative position between the image source and the lens using a mechanical diopter modulation component to achieve the desired diopter and see the virtual image clearly without glasses. However, the light from the real image passes directly through the BB lens, losing some intensity, and enters the myopic user's eye. Because this light path doesn't pass through the refractive lens, the myopic user sees a blurry image of the real environment. Therefore, this augmented reality solution is incomplete, as it only provides a clear virtual image, similar to a virtual display. Furthermore, this solution requires additional mechanical diopter adjustment components, increasing the size and weight of the entire optical module.

[0009] Currently, no effective solutions have been proposed for the problems existing in related technologies, such as the inability to simultaneously solve radial vertigo and diopter adjustment, high user costs, and the large size and light weight of head-mounted display devices. Summary of the Invention

[0010] The purpose of this invention is to address the shortcomings of existing technologies by providing a head-mounted display optical system, head-mounted display device, display method, computer equipment, and computer-readable storage medium based on liquid crystal lenses, in order to solve the problems existing in related technologies such as the inability to simultaneously solve radii glare and diopter adjustment, high user costs, and large size and light weight of head-mounted display devices.

[0011] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0012] In a first aspect, a head-mounted display optical system based on a liquid crystal lens is provided, comprising:

[0013] Image source unit, used to output virtual image source;

[0014] A lens unit is disposed downstream of the image source unit and is used to magnify and zoom the virtual image source to obtain a virtual image image.

[0015] The beam splitting unit is located downstream of the lens unit and is used to partially reflect and partially transmit the virtual image image magnified and zoomed by the lens unit, as well as to transmit the real image image.

[0016] A curved mirror unit is disposed downstream of the image source lens unit and in front of the beam splitter unit, and is used to partially reflect and transmit the virtual image reflected by the beam splitter unit and partially transmit the real image.

[0017] An eye-tracking unit is disposed on one side of the image source unit and is used to acquire the real-time gaze depth of the user's eyeballs;

[0018] A convergence-adjustable liquid crystal lens unit is disposed downstream of the image source unit and upstream of the lens unit, and is used to adjust the display depth of the virtual image source according to the real-time gaze depth;

[0019] The first diopter-adjustable liquid crystal lens unit is disposed on the rear side of the beam splitting unit or the rear side of the curved mirror unit, and is used to adjust the diopter.

[0020] The control unit is connected to the image source unit, the eye-tracking unit, the convergence-adjusting liquid crystal lens unit, and the first diopter-adjusting liquid crystal lens unit.

[0021] In some embodiments, the convergence-adjustable liquid crystal lens unit includes:

[0022] A plurality of convergence-adjustable liquid crystal lens elements are disposed between the image source unit and the lens unit and are respectively connected to the control unit, for adjusting the display depth of the virtual image source under the action of the control unit.

[0023] In some embodiments, the first diopter-adjustable liquid crystal lens unit includes:

[0024] A plurality of first diopter-adjusting liquid crystal lens elements are disposed on the rear side of the beam splitting unit and are respectively connected to the control unit for adjusting the diopter under the action of the control unit.

[0025] In some embodiments, the first diopter-adjustable liquid crystal lens unit includes:

[0026] A plurality of second diopter-adjustable liquid crystal lens elements are disposed between the beam splitting unit and the curved mirror unit, and are respectively connected to the control unit for adjusting the diopter under the action of the control unit.

[0027] In some of these embodiments, it also includes:

[0028] The second diopter-adjustable liquid crystal lens unit is disposed between the image source unit and the lens unit, and is located on one side of the convergence-adjustable liquid crystal lens unit, and is connected to the control unit, for adjusting the diopter of the virtual image source under the action of the control unit.

[0029] In some embodiments, the first diopter-adjustable liquid crystal lens unit includes:

[0030] A plurality of second diopter-adjustable liquid crystal lens elements are disposed between the beam splitting unit and the curved mirror unit, and are respectively connected to the control unit for adjusting the diopter under the action of the control unit.

[0031] In some embodiments, the second diopter-adjustable liquid crystal lens unit includes:

[0032] A plurality of third diopter-adjusting liquid crystal lens elements are disposed between the image source unit and the lens unit, and located on one side of the convergence-adjusting liquid crystal lens unit, and connected to the control unit, for adjusting the diopter of the virtual image source under the action of the control unit.

[0033] In a second aspect, a head-mounted display device based on a liquid crystal lens is provided, comprising:

[0034] The head-mounted display optical system as described in the first aspect.

[0035] Thirdly, a display method based on a liquid crystal lens is provided, applied to a head-mounted display optical system as described in the first aspect or a head-mounted display device as described in the second aspect, comprising:

[0036] Obtain the user's real-time gaze depth;

[0037] Convergence adjustment parameters are generated based on the real-time gaze depth;

[0038] The display depth of the virtual image source is adjusted according to the convergence adjustment parameters.

[0039] In some of these embodiments, it also includes:

[0040] Obtain the first refractive accommodation parameter;

[0041] The first diopter is adjusted according to the first diopter adjustment parameter, wherein the first diopter adjusts the diopter of the real environment.

[0042] In some of these embodiments, it also includes:

[0043] Obtain the second refractive accommodation parameter;

[0044] The second diopter is adjusted according to the second diopter adjustment parameter, wherein the second diopter adjusts the diopter of the virtual image source.

[0045] Fourthly, the present invention provides a computer device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the display method as described in the third aspect.

[0046] Fifthly, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the display method as described in the third aspect.

[0047] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0048] This invention discloses a head-mounted display optical system, head-mounted display device, display method, computer equipment, and computer-readable storage medium based on a liquid crystal lens. By setting a convergence-adjustable liquid crystal lens unit, a variable focus anti-dizziness function can be achieved. With the assistance of an eye-tracking unit, the focal length of the convergence-adjustable liquid crystal lens unit can be adjusted to change the display depth of the virtual image source of the image source unit, thereby achieving an anti-dizziness effect. Real-time tracking by the eye-tracking unit enables real-time dynamic adjustment of the focal length of the convergence-adjustable liquid crystal lens unit, thereby reducing fatigue caused by prolonged wear. A first diopter-adjustable liquid crystal lens unit corrects the vision of nearsighted users, allowing normal use of the head-mounted display optical system without the need for additional nearsighted glasses. Attached Figure Description

[0049] Figure 1 This is a schematic diagram (a) of a head-mounted display optical system according to an embodiment of the present invention.

[0050] Figure 2 This is a frame diagram of a head-mounted display optical system according to an embodiment of the present invention;

[0051] Figure 3 This is a schematic diagram of a convergence-adjustable liquid crystal lens unit according to an embodiment of the present invention;

[0052] Figure 4 This is a schematic diagram (a) of the first diopter-adjustable liquid crystal lens unit according to an embodiment of the present invention;

[0053] Figure 5 This is a schematic diagram (II) of a head-mounted display optical system according to an embodiment of the present invention.

[0054] Figure 6 This is a schematic diagram (II) of the first diopter-adjustable liquid crystal lens unit according to an embodiment of the present invention;

[0055] Figure 7 This is a schematic diagram of the second diopter-adjustable liquid crystal lens unit according to an embodiment of the present invention;

[0056] Figure 8 This is a flowchart (a) of a display method according to an embodiment of the present invention;

[0057] Figure 9 This is a flowchart (II) of a display method according to an embodiment of the present invention;

[0058] Figure 10 This is a flowchart (III) of a display method according to an embodiment of the present invention;

[0059] Figure 11 This is a schematic diagram (a) of a specific embodiment of a head-mounted display optical system according to an embodiment of the present invention.

[0060] Figure 12 This is a parameter schematic diagram of the convergence-adjusting liquid crystal lens unit / first diopter-adjusting liquid crystal lens unit of the head-mounted display optical system according to an embodiment of the present invention, wherein a is a liquid crystal arrangement diagram of the liquid crystal lens and b is a phase distribution diagram of the liquid crystal lens;

[0061] Figure 13 This is a schematic diagram (II) of a specific embodiment of a head-mounted display optical system according to an embodiment of the present invention.

[0062] The reference numerals in the accompanying drawings are as follows: 100, head-mounted display optical system; 110, image source unit; 120, lens unit; 130, beam splitting unit; 140, curved mirror unit; 150, eye-tracking unit; 160, convergence-adjusting liquid crystal lens unit; 161, convergence-adjusting liquid crystal lens element; 170, first diopter-adjusting liquid crystal lens unit; 171, first diopter-adjusting liquid crystal lens element; 172, second diopter-adjusting liquid crystal lens element; 180, control unit; 190, second diopter-adjusting liquid crystal lens unit; 191, third diopter-adjusting liquid crystal lens element. Detailed Implementation

[0063] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0064] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0065] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0066] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms “a,” “an,” “an,” “the,” and similar words used in this application do not indicate quantity limitation and may indicate singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or units (elements) is not limited to the listed steps or units, but may also include steps or units not listed, or may include other steps or units inherent to these processes, methods, products, or devices. The terms “connected,” “linked,” “coupled,” and similar words used in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Multiple” used in this application refers to two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following objects are in an "or" relationship. The terms "first," "second," and "third" used in this application are merely to distinguish similar objects and do not represent a specific ordering of the objects.

[0067] Example 1

[0068] This embodiment relates to a head-mounted display optical system and head-mounted display device based on a liquid crystal lens according to the present invention.

[0069] like Figures 1-2 As shown, a head-mounted display optical system 100 based on a liquid crystal lens includes an image source unit 110, a lens unit 120, a beam splitter unit 130, a curved mirror unit 140, an eye-tracking unit 150, a convergence-adjustable liquid crystal lens unit 160, a first diopter-adjustable liquid crystal lens unit 170, and a control unit 180. The image source unit 110 outputs a virtual image source; the lens unit 120 is located downstream of the image source unit 110 and is used to magnify and zoom the virtual image source to obtain a virtual image; the beam splitter unit 130 is located downstream of the lens unit 120 and is used to partially reflect and partially transmit the virtual image image magnified and zoomed by the lens unit 120, and to transmit the real image; the curved mirror unit 140 is located downstream of the image source lens unit 120 and in front of the beam splitter unit 130, and is used to partially reflect and partially transmit the virtual image image reflected by the beam splitter unit 130, and to transmit the real image. The image is partially transmitted; the eye-tracking unit 150 is located on one side of the image source unit 110 and is used to acquire the real-time gaze depth of the user's eyeball; the convergence-adjusting liquid crystal lens unit 160 is located downstream of the image source unit 110 and upstream of the lens unit 120 and is used to adjust the display depth of the virtual image source according to the real-time gaze depth; the first diopter-adjusting liquid crystal lens unit 170 is located behind the beam splitting unit 130 and is used to adjust the diopter; the control unit 180 is connected to the image source unit 110, the eye-tracking unit 150, the convergence-adjusting liquid crystal lens unit 160, and the first diopter-adjusting liquid crystal lens unit 170 respectively.

[0070] Image source unit 110 includes, but is not limited to, LCOS, DLP, Micro LED, LBS, etc.

[0071] Lens unit 120 includes, but is not limited to, a convex lens.

[0072] The beam splitter unit 130 is inclined. Specifically, the top end of the beam splitter unit 130 is located near the rear side of the lens unit 120, and the bottom end of the beam splitter unit 130 is located near the front side of the lens unit 120.

[0073] The beam splitter 130 includes at least one beam splitter. The beam splitter is inclined and is inclined from the rear side of the lens unit 120 to the front side of the lens unit 120.

[0074] When the beam splitting unit 130 includes a plurality of beam splitting elements, the plurality of beam splitting elements are arranged parallel to each other and spaced apart. Generally, the plurality of beam splitting elements are arranged at equal intervals.

[0075] The beam splitting unit 130 includes, but is not limited to, a polarization beam splitter.

[0076] The top of the curved mirror unit 140 is located near the front side of the lens unit 120, and the bottom of the curved mirror unit 140 is located near the bottom of the beam splitting unit 130.

[0077] In some embodiments, the curved mirror unit 140 includes a first waveplate element, a curved mirror element, and a second waveplate element. The first waveplate element is disposed at the lower part of the lens unit 120 and in front of the beam splitting unit 130; the curved mirror element is disposed at the lower part of the lens unit 120 and in front of the first waveplate element; and the second waveplate element is disposed at the lower part of the lens unit 120 and in front of the curved mirror element.

[0078] In some of these embodiments, the first waveplate element is a quarter-wave plate.

[0079] In some of these embodiments, the second waveplate element is a quarter-wave plate.

[0080] In some embodiments, the curved mirror unit 140 further includes a polarizing element. The polarizing element is disposed at the lower part of the lens unit 120 and in front of the second waveplate element.

[0081] In some of these embodiments, the polarizing element is a polarizing film.

[0082] The eye-tracking unit 150 includes at least one eye-tracking element. The eye-tracking element is located behind the image source unit 110 and above the user's eye.

[0083] In some embodiments, there are multiple eye-tracking elements. The multiple eye-tracking elements are spaced apart in a horizontal direction.

[0084] In some of these embodiments, the eye-tracking element is an eye-tracking sensor.

[0085] like Figure 3 As shown, the convergence-adjustable liquid crystal lens unit 160 includes a plurality of convergence-adjustable liquid crystal lens elements 161. These convergence-adjustable liquid crystal lens elements 161 are disposed between the image source unit 110 and the lens unit 120, and are respectively connected to the control unit 180, for adjusting the display depth of the virtual image source under the action of the control unit 180.

[0086] A plurality of convergence-adjustable liquid crystal lens elements 161 are arranged parallel to each other and spaced apart. Generally, the plurality of convergence-adjustable liquid crystal lens elements 161 are arranged at equal intervals.

[0087] Generally, several convergence-adjusting liquid crystal lens elements 161 have the same dimensions, including but not limited to length, width, height, and thickness.

[0088] Generally, the focal lengths of several convergent liquid crystal lens elements 161 may be the same or different.

[0089] Each convergence-adjustable liquid crystal lens element 161 is individually connected to the control unit 180 for adjusting the focal length under the action of the control unit 180. Specifically, after the control unit 180 loads an electrical signal of a specific waveform to the convergence-adjustable liquid crystal lens element 161, the arrangement of liquid crystal molecules in the convergence-adjustable liquid crystal lens element 161 changes, thereby adjusting the focal length of the convergence-adjustable liquid crystal lens element 161.

[0090] Each convergent liquid crystal lens element 161 includes a specific focal length state and / or a transparent state.

[0091] In the convergence-adjustable liquid crystal lens unit 160, the focal lengths of several convergence-adjustable liquid crystal lens elements 161 may be the same or different.

[0092] The number of convergence-adjustable liquid crystal lens elements 161 is related to the image depth that the image source unit 110 can display. Generally, the number of convergence-adjustable liquid crystal lens elements 161 is positively correlated with the number of image depth layers supported by the image source unit 110, that is, the more image depth layers the image source unit 110 has, the more convergence-adjustable liquid crystal lens elements 161 there are.

[0093] In some of these embodiments, the convergence-adjusting liquid crystal lens element 161 is an electrically controlled liquid crystal lens.

[0094] like Figure 4 As shown, the first diopter-adjustable liquid crystal lens unit 170 includes a plurality of first diopter-adjustable liquid crystal lens elements 171. The plurality of first diopter-adjustable liquid crystal lens elements 171 are disposed on the rear side of the beam splitting unit 130 and are respectively connected to the control unit 180 for adjusting the diopter under the action of the control unit 180.

[0095] A plurality of first diopter-adjusting liquid crystal lens elements 171 are arranged parallel to each other and spaced apart. Generally, the plurality of first diopter-adjusting liquid crystal lens elements 171 are arranged at equal intervals.

[0096] Generally, several first diopter-adjusting liquid crystal lens elements 171 have the same dimensions, including but not limited to length, width, height, and thickness.

[0097] Generally, the focal lengths of several first diopter-adjustable liquid crystal lens elements 171 may be the same or different.

[0098] In some of these embodiments, the first diopter-adjusting liquid crystal lens element 171 has the same specifications as the convergence-adjusting liquid crystal lens element 161.

[0099] Each first diopter-adjusting liquid crystal lens element 171 is individually connected to the control unit 180 and is used to adjust the focal length under the action of the control unit 180. Specifically, after the control unit 180 loads an electrical signal of a specific waveform to the first diopter-adjusting liquid crystal lens element 171, the arrangement of liquid crystal molecules in the first diopter-adjusting liquid crystal lens element 171 changes, thereby realizing the adjustment of the focal length of the first diopter-adjusting liquid crystal lens element 171.

[0100] Each of the first diopter-adjustable liquid crystal lens elements 171 includes a specific focal length state and / or a transparent state.

[0101] In the first diopter-adjustable liquid crystal lens unit 170, the focal lengths of a plurality of first diopter-adjustable liquid crystal lens elements 171 may be the same or different.

[0102] In some of these embodiments, the first diopter-adjustable liquid crystal lens element 171 is an electro-controlled liquid crystal lens.

[0103] The control unit 180 includes a first control element, a second control element, a third control element, a fourth control element, and a power supply element. The first control element is connected to the image source unit 110; the second control element is connected to the eye-tracking unit 150; the third control element is connected to the convergence-adjusting liquid crystal lens unit 160; the fourth control element is connected to the first diopter-adjusting liquid crystal lens unit 170; and the power supply element is connected to the first, second, third, and fourth control elements respectively.

[0104] The first control element is the first control module, which is connected to the image source unit 110 via a cable.

[0105] The second control element is the second control module, which is connected to the eye-tracking unit 150 via a cable.

[0106] The third control element is the third control module, which is connected to the convergence adjustment liquid crystal lens unit 160 (a plurality of convergence adjustment liquid crystal lens elements 161) via cables.

[0107] The fourth control element is the fourth control module, which is connected to the first diopter-adjusting liquid crystal lens unit 170 (a plurality of first diopter-adjusting liquid crystal lens elements 171) via a cable.

[0108] Power supply components include, but are not limited to, power supplies and batteries. Among them, power supplies include transformer modules and power supply modules.

[0109] The control unit 180 includes, but is not limited to, processors, chips, etc.

[0110] The head-mounted display device based on a liquid crystal lens of the present invention includes the head-mounted display optical system 100 as described above.

[0111] In this embodiment, the head-mounted display device is augmented reality glasses (AR glasses).

[0112] The usage method of this embodiment is as follows:

[0113] (a) Refractive accommodation

[0114] The user adjusts the focal length of several first diopter-adjustable liquid crystal lens elements 171 according to their own degree of myopia through the control unit 180;

[0115] (ii) Convergence regulation

[0116] The eye-tracking unit 150 tracks the user's real-time gaze depth;

[0117] The control unit 180 adjusts the focal length of several convergence adjustment liquid crystal lens elements 161 according to the real-time viewing depth, so as to adjust the depth of the image displayed by the image source unit 110.

[0118] The technical effects of this invention are as follows:

[0119] 1) By setting a convergence-adjustable liquid crystal lens unit, a variable focus anti-glare function can be achieved;

[0120] 2) With the assistance of the eye-tracking unit, the focal length of the convergence-adjusting liquid crystal lens unit can be adjusted according to the depth of the user's eye gaze, thereby changing the display depth of the virtual image source of the image source unit and achieving an anti-dizziness effect.

[0121] 3) By utilizing the real-time tracking of the eye-tracking unit, the focal length of the convergence-adjustable liquid crystal lens unit can be dynamically adjusted in real time, thereby reducing fatigue caused by prolonged wear.

[0122] 4) The first diopter-adjustable liquid crystal lens unit corrects the vision of nearsighted users, so that the head-mounted display optical system can be used normally without the need to wear additional nearsighted glasses.

[0123] Example 2

[0124] This embodiment relates to the head-mounted display optical system based on liquid crystal lenses of the present invention.

[0125] like Figure 5As shown, a head-mounted display optical system 100 based on liquid crystal lenses includes an image source unit 110, a lens unit 120, a beam splitter unit 130, a curved mirror unit 140, an eye-tracking unit 150, a convergence-adjusting liquid crystal lens unit 160, a first diopter-adjusting liquid crystal lens unit 170, a control unit 180, and a second diopter-adjusting liquid crystal lens unit 190. The image source unit 110 is used to output a virtual image source; the lens unit 120 is located downstream of the image source unit 110 and is used to magnify and zoom the virtual image source to obtain a virtual image; the beam splitting unit 130 is located downstream of the lens unit 120 and is used to partially reflect and partially transmit the virtual image image magnified and zoomed by the lens unit 120, as well as transmit the real image image; the curved mirror unit 140 is located downstream of the image source lens unit 120 and in front of the beam splitting unit 130, and is used to reflect the virtual image image reflected by the beam splitting unit 130; the eye tracking unit 150 is located on one side of the image source unit 110 and is used to obtain the real-time gaze depth of the user's eyeball; the convergence adjustment liquid crystal lens unit 160 is located... Downstream of the image source unit 110 and upstream of the lens unit 120, it is used to adjust the display depth of the virtual image source according to the real-time gaze depth; the first diopter-adjustable liquid crystal lens unit 170 is disposed on the rear side of the curved mirror unit 140 and is used to adjust the diopter; the control unit 180 is connected to the image source unit 110, the eye-tracking unit 150, the convergence-adjustable liquid crystal lens unit 160, the first diopter-adjustable liquid crystal lens unit 170, and the second diopter-adjustable liquid crystal lens unit 190 respectively; the second diopter-adjustable liquid crystal lens unit 190 is disposed between the image source unit 110 and the lens unit 120, and is located on one side of the convergence-adjustable liquid crystal lens unit 130, and is connected to the control unit 180, and is used to adjust the diopter of the virtual image source under the action of the control unit 180.

[0126] The structure and connection relationship of the image source unit 110, lens unit 120, beam splitting unit 130, curved mirror unit 140, eye tracking unit 150, and convergence adjustment liquid crystal lens unit 160 are basically the same as those in Embodiment 1, and will not be described again here.

[0127] like Figure 6 As shown, the first diopter-adjusting liquid crystal lens unit 170 includes a plurality of second diopter-adjusting liquid crystal lens elements 172. The plurality of second diopter-adjusting liquid crystal lens elements 172 are disposed between the beam splitting unit 130 and the curved mirror unit 140, and are respectively connected to the control unit 180 for adjusting the diopter under the action of the control unit 180.

[0128] A plurality of second diopter-adjusting liquid crystal lens elements 172 are arranged parallel to each other and spaced apart. Generally, the plurality of second diopter-adjusting liquid crystal lens elements 172 are arranged at equal intervals.

[0129] Generally, several second diopter-adjusting liquid crystal lens elements 172 have the same dimensions, including but not limited to length, width, height, and thickness.

[0130] Generally, the focal lengths of several second diopter-adjusting liquid crystal lens elements 172 may be the same or different.

[0131] In some of these embodiments, the second diopter-adjusting liquid crystal lens element 172 has the same specifications as the convergence-adjusting liquid crystal lens element 161.

[0132] Each second diopter-adjusting liquid crystal lens element 172 is individually connected to the control unit 180 and is used to adjust the focal length under the action of the control unit 180. Specifically, after the control unit 180 loads an electrical signal of a specific waveform to the second diopter-adjusting liquid crystal lens element 172, the arrangement of liquid crystal molecules in the second diopter-adjusting liquid crystal lens element 172 changes, thereby realizing the adjustment of the focal length of the second diopter-adjusting liquid crystal lens element 172.

[0133] Each of the second diopter-adjustable liquid crystal lens elements 172 includes a specific focal length state and a transparency state.

[0134] In the first diopter-adjusting liquid crystal lens unit 170, the focal lengths of a plurality of second diopter-adjusting liquid crystal lens elements 172 may be the same or different.

[0135] In some of these embodiments, the second diopter-adjustable liquid crystal lens element 172 is an electro-controlled liquid crystal lens.

[0136] The control unit 180 also includes a fifth control element. The fifth control element is connected to the power supply element and the second diopter-adjustable liquid crystal lens unit 190, respectively; the power supply element is connected to the first control element, the second control element, the third control element, and the fourth control element, respectively.

[0137] The fifth control element is the fifth control module, which is connected to the second diopter-adjustable liquid crystal lens unit 190 via a cable.

[0138] like Figure 7 As shown, the second diopter-adjusting liquid crystal lens unit 190 also includes a plurality of third diopter-adjusting liquid crystal lens elements 191. The third diopter-adjusting liquid crystal lens elements 191 are disposed between the image source unit 110 and the lens unit 120, and are located on one side of the plurality of convergence-adjusting liquid crystal lens units 160, and are connected to the control unit 180, for adjusting the diopter of the virtual image source under the action of the control unit 180.

[0139] Specifically, a plurality of third diopter-adjusting liquid crystal lens elements 191 are disposed on one side of a plurality of convergence-adjusting liquid crystal lens elements 161 and are respectively connected to the fifth control element.

[0140] A plurality of third diopter-adjusting liquid crystal lens elements 191 are arranged parallel to each other and spaced apart. Generally, the plurality of third diopter-adjusting liquid crystal lens elements 191 are arranged at equal intervals.

[0141] The third diopter-adjusting liquid crystal lens element 191 is disposed between the image source unit 110 and a plurality of convergence-adjusting liquid crystal lens elements 161, or disposed between a plurality of convergence-adjusting liquid crystal lens elements 161 and the lens unit 120.

[0142] The size of the third diopter-adjusting liquid crystal lens element 191 matches the size of the convergence-adjusting liquid crystal lens element 161. Generally, the size of the third diopter-adjusting liquid crystal lens element 191 is equal to the size of the convergence-adjusting liquid crystal lens element 161.

[0143] Generally, several third diopter-adjustable liquid crystal lens elements 191 have the same dimensions, including but not limited to length, width, height, and thickness.

[0144] Generally, the focal lengths of several third diopter-adjustable liquid crystal lens elements 191 may be the same or different.

[0145] In some of these embodiments, the third diopter-adjustable liquid crystal lens element 191 is an electro-controlled liquid crystal lens.

[0146] The head-mounted display device based on a liquid crystal lens of the present invention includes the head-mounted display optical system 100 as described above.

[0147] In this embodiment, the head-mounted display device is augmented reality glasses (AR glasses).

[0148] The usage method of this embodiment is as follows:

[0149] (a) Refractive accommodation

[0150] The user adjusts the focal length of several second diopter-adjustable liquid crystal lens elements 172 according to their own degree of myopia through the control unit 180;

[0151] The focal length of several third diopter-adjustable liquid crystal lens elements 191 is adjusted by the control unit 180;

[0152] (ii) Convergence regulation

[0153] The eye-tracking unit 150 tracks the user's real-time gaze depth;

[0154] The control unit 180 adjusts the focal length of the convergence-adjusting liquid crystal lens element 161 in real time to adjust the depth of the image displayed by the image source unit 110.

[0155] The technical effects of this embodiment are as follows:

[0156] 1) By setting a convergence-adjustable liquid crystal lens unit, a variable focus anti-glare function can be achieved;

[0157] 2) With the assistance of the eye-tracking unit, the focal length of the convergence-adjusting liquid crystal lens unit can be adjusted according to the depth of the user's eye gaze, thereby changing the display depth of the virtual image source of the image source unit and achieving an anti-dizziness effect.

[0158] 3) By utilizing the real-time tracking of the eye-tracking unit, the focal length of the convergence-adjustable liquid crystal lens unit can be dynamically adjusted in real time, thereby reducing fatigue caused by prolonged wear.

[0159] 4) The first diopter-adjustable liquid crystal lens unit corrects the vision of nearsighted users, so that the head-mounted display optical system can be used normally without the need to wear additional nearsighted glasses;

[0160] 5) The first diopter-adjusting liquid crystal lens unit is located between the beam splitting unit and the curved mirror unit, which avoids the formation of a fragile triangular cavity structure between the bottom of the diopter-adjusting liquid crystal lens unit and the beam splitting unit due to the first diopter-adjusting liquid crystal lens unit being located behind the beam splitting unit, thus improving the overall integrity of the head-mounted display optical system.

[0161] 6) The diopter of the first diopter-adjusting liquid crystal lens unit and the second diopter-adjusting liquid crystal lens unit can be adjusted respectively, thereby adjusting the diopter of the real environment and the diopter of the virtual image source respectively.

[0162] Example 3

[0163] This embodiment relates to the display method based on a liquid crystal lens of the present invention.

[0164] Figure 8 This is a flowchart (a) of a display method according to an embodiment of the present invention. Figure 8 As shown, a display method includes:

[0165] Step S802: Obtain the real-time gaze depth of the user's eyes;

[0166] Step S804: Generate convergence adjustment parameters based on real-time gaze depth;

[0167] Step S806: Adjust the display depth of the virtual image source according to the convergence adjustment parameters.

[0168] In this embodiment, the execution subject of steps S802 to S806 is the control unit 180 of the head-mounted display optical system 100.

[0169] In step S804, the convergence adjustment parameters include current signal and voltage signal.

[0170] In step S806, the display depth of the virtual image source is adjusted to the focal length of the convergence-adjusting liquid crystal lens unit 160.

[0171] In some embodiments, steps S702 to S706 specifically include:

[0172] The eye-tracking unit 150 acquires the real-time gaze depth of the user's eyes;

[0173] The control unit 180 generates convergence adjustment parameters based on the real-time gaze depth;

[0174] The control unit 180 adjusts the focal length of the convergence-adjusting liquid crystal lens unit 160 (a plurality of convergence-adjusting liquid crystal lens elements 161) according to the convergence adjustment parameters, so as to adjust the display depth of the virtual image source of the image source unit 110.

[0175] Figure 9 This is a flowchart (II) of a display method according to an embodiment of the present invention. Figure 9 As shown, the display method also includes:

[0176] Step S902: Obtain the first refractive adjustment parameter;

[0177] Step S904: Adjust the first diopter according to the first diopter adjustment parameter, wherein the first diopter adjusts the diopter of the real environment.

[0178] In this embodiment, the execution subject of steps S902 to S904 is the control unit 180 of the head-mounted display optical system 100.

[0179] In step S902, the first refractive adjustment parameter includes a current signal and a voltage signal.

[0180] In step S904, adjusting the first diopter is to adjust the focal length of the first diopter-adjusting liquid crystal lens unit 170 (a plurality of first diopter-adjusting liquid crystal lens elements 171 or a plurality of second diopter-adjusting liquid crystal lens elements 172).

[0181] In this embodiment, steps S802 to S804 are applicable to Embodiments 1 and 2.

[0182] Figure 10 This is a flowchart (III) of a display method according to an embodiment of the present invention. Figure 10 As shown, the display method also includes:

[0183] Step S1002: Obtain the second refractive adjustment parameter;

[0184] Step S1004: Adjust the second diopter according to the second diopter adjustment parameter, wherein the second diopter adjusts the diopter of the virtual image source.

[0185] In this embodiment, the execution subject of steps S1002 to S1004 is the control unit 180 of the head-mounted display optical system 100.

[0186] In step S1002, the second refractive adjustment parameter includes a current signal and a voltage signal.

[0187] In step S1004, adjusting the second diopter is to adjust the focal length of the second diopter-adjusting liquid crystal lens unit 190 (a plurality of third diopter-adjusting liquid crystal lens elements 191).

[0188] In this embodiment, steps S1002 to S1004 are applicable to Embodiment 2.

[0189] Furthermore, the display method of this application embodiment can be implemented by a computer device. Components of the computer device may include, but are not limited to, a processor and a memory storing computer program instructions.

[0190] In some embodiments, the processor may include a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0191] In some embodiments, the memory may include a mass storage device for data or instructions. For example, and not limitingly, the memory may include a hard disk drive (HDD), a floppy disk drive, a solid-state drive (SSD), flash memory, an optical disk drive, a magneto-optical disk drive, magnetic tape, or a Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, the memory may include removable or non-removable (or fixed) media. Where appropriate, the memory may be internal or external to a data processing device. In a particular embodiment, the memory is non-volatile memory. In a particular embodiment, the memory includes read-only memory (ROM) and random access memory (RAM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), an electrically alterable read-only memory (EAROM), or flash memory, or a combination of two or more of these. Where appropriate, the RAM can be Static Random-Access Memory (SRAM) or Dynamic Random-Access Memory (DRAM). DRAM can be Fast Page Mode Dynamic Random-Access Memory (FPMDRAM), Extended Data Out Dynamic Random-Access Memory (EDODRAM), Synchronous Dynamic Random-Access Memory (SDRAM), etc.

[0192] Memory can be used to store or cache various data files that need to be processed and / or communicated, as well as possible computer program instructions executed by the processor.

[0193] The processor implements any of the display methods described in the above embodiments by reading and executing computer program instructions stored in memory.

[0194] In some embodiments, the computer device may further include a communication interface and a bus. The processor, memory, and communication interface are connected via the bus and communicate with each other.

[0195] The communication interface is used to enable communication between the various units, devices, and / or equipment in the embodiments of this application. The communication interface can also enable data communication with other components such as external devices, image / data acquisition devices, databases, external storage, and image / data processing workstations.

[0196] A bus, including hardware, software, or both, couples components of a computer device together. Buses include, but are not limited to, at least one of the following: data bus, address bus, control bus, expansion bus, and local bus. For example, and not as a limitation, a bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Extended Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hyper Transport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local Bus (VLB) bus, or other suitable buses, or a combination of two or more of these. Where appropriate, a bus may include one or more buses. Although specific buses are described and illustrated in the embodiments of this application, this application considers any suitable bus or interconnection.

[0197] The computer device can perform the display method in the embodiments of this application.

[0198] Furthermore, in conjunction with the display methods described in the above embodiments, this application can provide a computer-readable storage medium for implementation. This computer-readable storage medium stores computer program instructions; when these computer program instructions are executed by a processor, they implement any of the display methods described in the above embodiments.

[0199] Example 4

[0200] This embodiment is a specific implementation of Embodiment 1 of the present invention.

[0201] like Figure 11 As shown, a focal length adjustable module for augmented reality devices based on liquid crystal lenses (equivalent to the head-mounted display optical system 100 based on liquid crystal lenses of the present invention) includes a virtual image source (i.e., a microdisplay, equivalent to the image source unit 110 of the present invention), a lens (equivalent to the lens unit 120 of the present invention), a BB optical module (equivalent to the beam splitting unit 130 and the curved mirror unit 140 of the present invention), an eye-tracking sensor (equivalent to the eye-tracking unit 150 of the present invention), a VAC depth-adjustable liquid crystal lens group (equivalent to the convergence-adjustable liquid crystal lens unit 160 of the present invention), a diopter-adjustable liquid crystal lens group (equivalent to the first diopter-adjustable liquid crystal lens unit 170 of the present invention), and a main controller (equivalent to the control unit 180 of the present invention). The system includes a lens positioned below the virtual image source; a BB optical module positioned below the lens; an eye-tracking sensor positioned behind the virtual image source; a VAC depth-adjustable liquid crystal lens group positioned between the virtual image source and the lens; and a diopter-adjustable liquid crystal lens group positioned behind the BB optical module. The main controller is connected to the virtual image source, eye-tracking sensor, VAC depth-adjustable liquid crystal lens group, and diopter-adjustable liquid crystal lens group via a bus.

[0202] The transmission path of the virtual image is as follows: Virtual image source → VAC depth-adjustable liquid crystal lens group → Lens → BB optical module → diopter-adjustable liquid crystal lens group → user's eye.

[0203] The transmission path of the actual image: BB optical module → diopter-adjustable liquid crystal lens group → user's eye.

[0204] The virtual and real images are fused in the BB optical module and then enter the user's eyes through the diopter-adjustable liquid crystal lens group.

[0205] The VAC depth-adjustable liquid crystal lens group includes several VAC depth-adjustable liquid crystal lenses. In this embodiment, the VAC depth-adjustable liquid crystal lens group includes two layers of VAC depth-adjustable liquid crystal lenses as an example. In practice, the configuration can be adjusted according to the actual needs of the product. Generally speaking, the more depth layers that need to be supported within the required depth range, the more lens layers are required.

[0206] The diopter-adjustable liquid crystal lens assembly includes several diopter-adjustable liquid crystal lenses. In this embodiment, the diopter-adjustable liquid crystal lens assembly includes two layers of diopter-adjustable liquid crystal lenses as an example. In practice, the configuration can be adjusted according to the actual needs of the product. Generally speaking, the more myopia values ​​that need to be covered, the more lens layers are required.

[0207] Both VAC depth-adjustable liquid crystal lenses and diopter-adjustable liquid crystal lenses are electronically controlled liquid crystal lenses, and their liquid crystal arrangement and phase distribution are as follows: Figure 12 As shown.

[0208] The main controller adjusts the virtual image through the VAC depth-adjusting liquid crystal lens assembly to the corresponding depth based on the user's eye gaze depth captured by the eye-tracking sensor. This method simulates the eye behavior of a user when perceiving a real 3D environment, achieving a true 3D display system that can prevent dizziness. Since the ambient light in the real world is itself a continuous depth, there is no VAC (Vergence-Accommodation Conflict) problem, and no need to adjust depth. Therefore, the VAC depth-adjusting liquid crystal lens assembly here only adjusts the depth of the virtual image.

[0209] In this invention, the virtual image depth adjustment is an automatic adjustment that does not require user intervention and is a real-time dynamic adjustment. The main controller obtains the real-time gaze depth of the eye-tracking sensor to generate a corresponding VAC depth adjustment liquid crystal lens group control signal that can adjust the focal plane to that depth. These control signals are transmitted to the electrodes of each layer of VAC depth adjustment liquid crystal lens group through the liquid crystal lens group drive and control bus.

[0210] The diopter-adjustable liquid crystal lens group is located on the exit pupil side closest to the eye. It is used to simultaneously adjust the focus position of the fused virtual and real image (the image formed by the fusion of virtual and real images) that ultimately enters the user's eye, thereby correcting the vision of nearsighted users. Unlike the VAC depth-adjustable liquid crystal lens group, the diopter-adjustable liquid crystal lens group adjusts the light of both the real image and the virtual image. The diopter can be adjusted by the user according to their degree of nearsightedness. Generally, since the degree of nearsightedness is basically constant, each user only needs to set the diopter once. After setting, the main controller will store the setting and automatically load the setting each time the device is turned on to adjust the diopter to that value.

[0211] The technical effects of this invention are as follows:

[0212] 1) It supports both myopia and hyperopia refractive adjustment, and the refractive power is adjusted by electrical signals, eliminating the need for mechanical control components, thereby reducing the weight of the head-mounted display device and greatly reducing the difficulty of production and assembly;

[0213] 2) Users do not need to purchase separate refractive lenses (i.e., nearsighted or farsighted glasses) to match the head-mounted display device, which greatly reduces the user's cost;

[0214] 3) The VAC depth-adjustable liquid crystal lens group and the diopter-adjustable liquid crystal lens group can be integrated into the existing BB optical module, reducing development costs and improving production efficiency;

[0215] 4) Easy integration: This implementation scheme can loosely couple the liquid crystal lens with existing mature BB module products without changing the structure of the BB optical module, so as to achieve the functions of anti-radiation vertigo and refractive adjustment.

[0216] Example 5

[0217] This embodiment is a specific implementation of Embodiment 2 of the present invention.

[0218] like Figure 13 As shown, a focal length adjustable module for augmented reality devices based on liquid crystal lenses (equivalent to the head-mounted display optical system 100 based on liquid crystal lenses of the present invention) includes a virtual image source (i.e., a micro-display, equivalent to the image source unit 110 of the present invention), a lens (equivalent to the lens unit 120 of the present invention), a BB optical module (equivalent to the beam splitting unit 130 and the curved mirror unit 140 of the present invention), an eye-tracking sensor (equivalent to the eye-tracking unit 150 of the present invention), a VAC depth-adjusting liquid crystal lens group (equivalent to the convergence-adjusting liquid crystal lens unit 160 of the present invention), a virtual image refractive adjustment lens group (equivalent to the second refractive adjustment liquid crystal lens unit 190 of the present invention), a real-environment refractive power adjustable liquid crystal lens group (equivalent to the first refractive adjustment liquid crystal lens unit 170 of the present invention), and a main controller (equivalent to the control unit 180 of the present invention). The system comprises: a lens positioned below the virtual image source; a BB optical module positioned below the lens; an eye-tracking sensor positioned behind the virtual image source; a VAC depth-adjustable liquid crystal lens group positioned between the virtual image source and the lens; a virtual image refractive adjustment lens group positioned between the virtual image source and the lens, located upstream or downstream of the VAC depth-adjustable liquid crystal lens group; and a real-environment refractive power adjustable liquid crystal lens group embedded within the BB optical module. The main controller is connected to the virtual image source, the eye-tracking sensor, the VAC depth-adjustable / virtual image refractive power adjustable liquid crystal lens group, and the real-environment refractive power adjustable liquid crystal lens group via a bus.

[0219] The transmission path of the virtual image is as follows: Virtual image source → VAC depth-adjustable liquid crystal lens group → Virtual image diopter-adjustable lens group → Lens → BB optical module → Real environment diopter-adjustable liquid crystal lens group (round trip) → BB optical module → User's eye.

[0220] The transmission path of the real image: BB optical module → real environment diopter adjustable liquid crystal lens group (single path) → user's eye.

[0221] Virtual and real images are fused together in the BB optical module and then enter the user's eyes.

[0222] The VAC depth adjustment liquid crystal lens group includes several VAC depth adjustment liquid crystal lenses. In this embodiment, an example is given where the VAC depth adjustment liquid crystal lens group includes two layers of VAC depth adjustment liquid crystal lenses, which are used to adjust the depth of the virtual image. In practice, the configuration can be adjusted according to the actual needs of the product. Generally, the more depth layers needed to support within the required depth range, the more lens layers are required.

[0223] The virtual image diopter-adjusting lens assembly includes several virtual image diopter-adjusting liquid crystal lenses. In this embodiment, the virtual image diopter-adjusting lens assembly includes two layers of virtual image diopter-adjusting liquid crystal lenses as an example. These two layers are used to adjust the diopter of the virtual image. In practice, the configuration can be adjusted according to the actual needs of the product. Generally, the more diopter values ​​that need to be covered, the more lens layers are required.

[0224] The real-world diopter adjustable liquid crystal lens assembly includes several real-world diopter adjustable liquid crystal lenses. In this embodiment, the example is a real-world diopter adjustable liquid crystal lens assembly comprising two layers of real-world diopter adjustable liquid crystal lenses. In practice, the configuration can be adjusted according to the actual needs of the product. Generally, the more myopia values ​​that need to be covered, the more lens layers are required.

[0225] VAC depth-adjustable liquid crystal lenses, virtual image diopter-adjustable liquid crystal lenses, and real-environment diopter-adjustable liquid crystal lenses are all electronically controlled liquid crystal lenses. Their liquid crystal arrangement and phase distribution are as follows: Figure 12 As shown.

[0226] The light from the virtual image passes back and forth through the real-world diopter-adjustable liquid crystal lens group. Because the refractive effects of the outward and return journeys cancel each other out, the real-world diopter-adjustable liquid crystal lens group effectively only adjusts the optical properties of the real-world environment, while the virtual image passes directly through. Simultaneously, the virtual image diopter-adjustable liquid crystal lens group can be used to adjust the diopter of the virtual image.

[0227] The technical effects of this invention are as follows:

[0228] 1) All liquid crystal lenses are deeply integrated inside the BB light module, eliminating the need for additional lenses as described in Example 4 (e.g.) Figure 11 The beam-splitting bevel of the BB optical module (as shown) forms a cavity between itself and the refractive lens parallel to the user's face, greatly improving the device's appearance and mechanical robustness.

[0229] 2) Users can adjust the refractive power of the virtual screen and the real environment separately, or they can adjust the virtual screen and the real environment screen to the same refractive power at the same time.

[0230] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A head-mounted display optical system based on a liquid crystal lens, characterized in that, include: Image source unit, used to output virtual image source; A lens unit is disposed downstream of the image source unit and is used to magnify and zoom the virtual image source to obtain a virtual image image. The beam splitting unit is located downstream of the lens unit and is used to partially reflect and partially transmit the virtual image image magnified and zoomed by the lens unit, as well as to transmit the real image image. A curved mirror unit is disposed downstream of the lens unit and in front of the beam splitter unit, and is used to partially reflect and transmit the virtual image reflected by the beam splitter unit and partially transmit the real image. An eye-tracking unit is disposed on one side of the image source unit and is used to acquire the real-time gaze depth of the user's eyeballs; A convergence-adjustable liquid crystal lens unit is disposed downstream of the image source unit and upstream of the lens unit, and is used to adjust the display depth of the virtual image source according to the real-time gaze depth; The first diopter-adjustable liquid crystal lens unit is disposed on the rear side of the beam splitting unit or the rear side of the curved mirror unit, and is used to adjust the diopter. The control unit is connected to the image source unit, the eye tracking unit, the convergence-adjusting liquid crystal lens unit, and the first diopter-adjusting liquid crystal lens unit, respectively. The second diopter-adjustable liquid crystal lens unit is disposed between the image source unit and the lens unit, and is located on one side of the convergence-adjustable liquid crystal lens unit, and is connected to the control unit, for adjusting the diopter of the virtual image source under the action of the control unit.

2. The head-mounted display optical system according to claim 1, characterized in that, The convergence-adjustable liquid crystal lens unit includes: A plurality of convergence-adjustable liquid crystal lens elements are disposed between the image source unit and the lens unit and are respectively connected to the control unit, for adjusting the display depth of the virtual image source under the action of the control unit.

3. The head-mounted display optical system according to claim 1, characterized in that, The first diopter-adjustable liquid crystal lens unit includes: A plurality of first diopter-adjusting liquid crystal lens elements are disposed on the rear side of the beam splitting unit and are respectively connected to the control unit for adjusting the diopter under the action of the control unit.

4. The head-mounted display optical system according to claim 1, characterized in that, The first diopter-adjustable liquid crystal lens unit includes: A plurality of second diopter-adjustable liquid crystal lens elements are disposed between the beam-splitting unit and the curved mirror unit, and are respectively connected to the control unit for adjusting the diopter under the action of the control unit; and / or The second diopter-adjustable liquid crystal lens unit includes: A plurality of third diopter-adjusting liquid crystal lens elements are disposed between the image source unit and the lens unit, and located on one side of the convergence-adjusting liquid crystal lens unit, and connected to the control unit, for adjusting the diopter of the virtual image source under the action of the control unit.

5. A head-mounted display device based on a liquid crystal lens, characterized in that, include: The head-mounted display optical system as described in any one of claims 1 to 4.

6. A display method based on a liquid crystal lens, applied to a head-mounted display optical system as described in any one of claims 1 to 4 or a head-mounted display device as described in claim 5, characterized in that, include: Obtain the user's real-time gaze depth; Convergence adjustment parameters are generated based on the real-time gaze depth; The display depth of the virtual image source is adjusted according to the convergence adjustment parameters.

7. The display method according to claim 6, characterized in that, Also includes: Obtain the first refractive accommodation parameter; The first diopter is adjusted according to the first diopter adjustment parameter, wherein the first diopter adjusts the diopter of the real environment; and / or Obtain the second refractive accommodation parameter; The second diopter is adjusted according to the second diopter adjustment parameter, wherein the second diopter adjusts the diopter of the virtual image source.

8. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the display method as described in any one of claims 6 to 7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the display method as described in any one of claims 6 to 7.

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