AR (Augmented Reality) module and active alignment method and equipment of AR module

Abstract

The invention relates to an AR module and an active alignment method and device of the AR module, the AR module comprises a display screen, a lens assembly and a focusing mechanism, the lens assembly comprises a plurality of lenses, the display screen is fixedly connected with the first lens in the lens assembly, the first lens is fixedly connected with the focusing mechanism, and the focusing mechanism is fixedly connected with the display screen. And the focusing mechanism is used for driving the first lens and the display screen to move, so that the relative positions of the display screen and other lenses in the lens assembly are changed to realize focusing.

Description

Technical Field

[0001] The present disclosure relates to optical display technology, and more specifically, to an AR module, an active alignment method and a device for the AR module. Background Art

[0002] In recent years, with the development of augmented reality (AR) technology, AR devices have gradually met people's pursuit of visual experience, especially AR glasses.

[0003] At present, adjustable diopter has become an important function of AR glasses. In the prior art, a screen bracket is often used between the display screen and the lens, and the display screen and the lens are fixed by the physical positioning of the screen bracket. This method of using a screen bracket will increase the thickness of the module composed of the display screen and the lens. In addition, in the prior art, during the assembly process of AR glasses, AA (Active Alignment) is not performed on the display screen and the lens fixed by the screen bracket, or only AA is performed on the display screen, which results in low precision of the module composed of the display screen and the lens after assembly. Summary of the invention

[0004] An object of the present invention is to provide a new technical solution for an AR module.

[0005] According to a first aspect of the present invention, an AR module is provided, comprising: a display screen, a lens assembly and a focusing mechanism, wherein:

[0006] The lens assembly includes a plurality of lenses, the display screen is fixedly connected to a first lens in the lens assembly, and the first lens is fixedly connected to the focusing mechanism.

[0007] The focusing mechanism is used to drive the first lens and the display screen to move, so that the relative position of the display screen and other lenses in the lens assembly changes, so as to achieve focusing.

[0008] Optionally, the first lens includes a first optical surface, a second optical surface and a first fixed plane, the first lens is fixedly connected to the display screen via the first optical surface, and the first lens is fixedly connected to the focusing mechanism via the first fixed plane.

[0009] Optionally, a positioning piece is provided on the first optical surface, and the first lens is fixedly connected to the display screen via the positioning piece.

[0010] Optionally, the focusing mechanism includes a rotating component, a slider and a sliding guide, wherein the rotating component is provided with an external thread, the slider is provided with a threaded hole, the portion of the rotating component provided with the external thread is embedded in the threaded hole, the slider is also provided with a first through hole, the sliding guide passes through the first through hole, the slider is fixedly connected to the first lens, and the rotating component is used to drive the slider to slide along the sliding guide when the rotating component itself only rotates, thereby driving the first lens and the display screen to move.

[0011] Optionally, the focusing mechanism further includes a structural member and a buckle, wherein the buckle is fixed to the structural member, and the sliding guide is fixed to the structural member.

[0012] The structural member is provided with a second through hole, the rotating component passes through the second through hole, the rotating component is provided with a slot along the circumference, the buckle is arranged in the slot, and the buckle is used to limit the movement of the rotating component when the rotating component rotates.

[0013] Optionally, the focusing mechanism further includes a first structural member, a second structural member and a buckle, the first structural member and the second structural member are fixedly connected, the buckle is fixed on the first structural member, and the sliding guide is fixed on the second structural member.

[0014] The first structural member is provided with a third through hole, the rotating component passes through the third through hole, the rotating component is provided with a slot along the circumference, the buckle is arranged in the slot, and the buckle is used to limit the movement of the rotating component when the rotating component rotates.

[0015] According to a second aspect of the present invention, there is provided an active alignment method for an AR module, which is applied to the AR module as described in any one of the first aspects, comprising:

[0016] The fixed display screen, lens assembly and the focusing mechanism are all arranged on an active alignment device;

[0017] Controlling the first motion mechanism of the active alignment device to drive the focusing mechanism to move so that the focusing mechanism is at a preset position, where the diopter of the AR module is a preset diopter;

[0018] Controlling the second motion mechanism of the active alignment device to drive the fixed display screen and lens assembly to move and / or rotate, so that the diopter corresponding to the fixed display screen and lens assembly is a preset diopter;

[0019] The fixed display screen and lens assembly and the focusing mechanism are fixed to obtain an assembled AR module.

[0020] Optionally, the second motion mechanism controlling the active alignment device drives the fixed display screen and lens assembly to move and / or rotate so that the diopter corresponding to the fixed display screen and lens assembly is a preset diopter, including:

[0021] Controlling the active alignment device to drive the fixed display screen and lens assembly to move and / or rotate;

[0022] Controlling the display screen to display a calibration image;

[0023] Using a camera to capture the calibration image displayed on the display screen to obtain a captured image;

[0024] When the captured image does not coincide with the calibration image or the quality of the captured image does not meet the preset requirements, the active alignment device is controlled to drive the fixed display screen and lens assembly to continue to move and / or rotate until the captured image coincides with the calibration image and the quality of the captured image meets the preset requirements.

[0025] Optionally, the method further includes:

[0026] Detecting the imaging quality of the assembled AR module;

[0027] When the imaging quality of the assembled AR module meets the preset requirements, the AR module is determined to be a qualified product.

[0028] According to a third aspect of the present invention, there is provided an active alignment device for an AR module, comprising: a controller, a first motion mechanism, and a second motion mechanism, wherein the controller is used to set the fixed display screen and lens assembly, and the focusing mechanism on the active alignment device;

[0029] Controlling the first motion mechanism of the active alignment device to drive the focusing mechanism to move so that the focusing mechanism is at a preset position, where the diopter of the AR module is a preset diopter;

[0030] Controlling the second motion mechanism of the active alignment device to drive the fixed display screen and lens assembly to move and / or rotate, so that the diopter corresponding to the fixed display screen and lens assembly is a preset diopter;

[0031] The fixed display screen and lens assembly and the focusing mechanism are fixed to obtain an assembled AR module.

[0032] In the AR module provided by the present invention, the display screen is fixedly connected to the first lens in the lens assembly, which can reduce the thickness of the AR module, thereby achieving the purpose of thinning the AR module. In addition, the first lens and the display screen are driven to move by the focusing mechanism, so that the relative position of the display screen and other lenses in the lens assembly changes, thereby changing the virtual image distance of the AR module and achieving different refractive powers.

[0033] Features and advantages of the embodiments of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the embodiments of the specification.

[0035] Figure 1 4 is a schematic diagram of the structure of an AR module according to an embodiment of the present invention.

[0036] Figure 2 is a schematic structural diagram of a first lens according to an embodiment of the present invention.

[0037] Figure 3 4 is a schematic diagram of the structure of an AR module according to an embodiment of the present invention.

[0038] Figure 4 is a schematic structural diagram of a slider according to an embodiment of the present invention.

[0039] Figure 5 is a schematic structural diagram of a slider according to an embodiment of the present invention.

[0040] Figure 6 4 is a processing flow chart of an active alignment method of an AR module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] Various exemplary embodiments of the present specification will now be described in detail with reference to the accompanying drawings.

[0042] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the embodiments of the present specification and its application or uses.

[0043] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0044] In one embodiment of the present invention, an AR module is provided. Figure 1As shown, the AR module includes: a display screen 110 , a lens assembly and a focusing mechanism 130 .

[0045] The lens assembly includes a plurality of lenses. Figure 2 Only the first lens 121 in the lens assembly is shown. The display screen 110 is fixedly connected to the first lens 121 in the lens assembly. The first lens 121 is fixedly connected to the focusing mechanism 130. The focusing mechanism 130 is used to drive the first lens 121 and the display screen 110 to move, so that the relative position of the display screen 110 and other lenses in the lens assembly changes to achieve focusing.

[0046] In the AR module provided by the embodiment of the present invention, the display screen is fixedly connected to the first lens in the lens assembly, which can reduce the thickness of the AR module, thereby achieving the purpose of thinning the AR module. In addition, the first lens and the display screen are driven to move by the focusing mechanism, so that the relative position of the display screen and other lenses in the lens assembly changes, thereby changing the virtual image distance of the AR module and achieving different refractive powers.

[0047] In some embodiments, the fixed connection between the display screen 110 and the first lens 121 in the lens assembly is a glued fixed connection.

[0048] In some embodiments, the display screen 110 can be an LCD (Liquid Crystal Display) display screen, an OLED (Organic Light-Emitting Diode) display screen, a QLED (Quantum Dot LightEmitting Diode) display screen, or a Mini-LED or Micro-LED display screen to provide the required image.

[0049] In some embodiments, each lens in the lens assembly is a plastic injection molded part.

[0050] In some embodiments, the first lens 121 and the focusing mechanism 130 may be fixed by gluing or by using fasteners.

[0051] In some embodiments, according to Figure 2 As shown, the first lens includes a first optical surface 1211, a second optical surface 1212 and a first fixed plane 1213. The first lens is fixedly connected to the display screen 110 via the first optical surface 1211. The first lens is fixedly connected to the focusing mechanism via the first fixed plane 1211.

[0052] The first optical surface 1211 and the second optical surface 1212 are used to provide optical power in the optical system. The surface shapes of the first optical surface 1211 and the second optical surface 1212 can be selected according to the requirements, for example, aspherical, spherical, and flat. The surface shapes of the first optical surface 1211 and the second optical surface 1212 can be the same or different. Figure 2 The two optical surfaces of the first lens 1211 are both aspherical surfaces.

[0053] The first fixed plane 1213 is a plane so as to be fixed with the focusing mechanism. The first fixed plane 1213 and the focusing mechanism can be fixed by gluing, or can be fixed by fasteners. When the first fixed plane 1213 and the focusing mechanism are fixed by gluing, the size of the first fixed plane can be designed according to the gluing strength of the first lens and the focusing mechanism. If the gluing strength requirement of the first lens and the focusing mechanism is relatively large, the first fixed plane is relatively large; if the gluing strength requirement of the first lens and the focusing mechanism is relatively small, the first fixed plane is relatively small.

[0054] In some embodiments, a positioning piece is provided on the first optical surface. The first lens is glued and fixed to the display screen through the positioning piece. The positioning piece is used to ensure the distance between the first optical surface of the first lens and the display screen, and is also used to ensure the parallelism of the first lens and the display screen when glued to the display screen, so as to ensure the imaging quality. The display screen is glued and fixed on the positioning piece, and the gluing of the display screen and the first lens can be achieved by visual alignment. Visual alignment is that the center position of the display screen coincides with the center position of the first lens, and the alignment is set according to the boundary of the display screen and the boundary of the first lens. The alignment setting of the boundary of the display screen and the boundary of the first lens can be that the boundary of the display screen and the boundary of the first lens in a predetermined direction are parallel to each other.

[0055] The positioning member can be a positioning rib or a positioning column. Figure 2 As shown, the positioning member disposed on the first optical surface 1211 is a positioning rib 1211a. The first lens is fixedly connected to the display screen via the positioning rib 1211a. The fixed connection is, for example, a gluing fixed connection.

[0056] In some embodiments, according to Figure 1 and Figure 3 As shown, the focusing mechanism 130 includes a rotating component 131, a slider 132 and a sliding guide 133. The rotating component 131 is provided with an external thread. The slider 132 is provided with a threaded hole. The portion of the rotating component 131 provided with the external thread is built into the threaded hole. The slider 132 is also provided with a first through hole. The sliding guide 133 passes through the first through hole. The slider 132 is fixedly connected to the first lens 121. The rotating component 131 is used to drive the slider 132 to slide along the sliding guide 133 when the rotating component 131 itself is only rotated, thereby driving the first lens 121 and the display screen 110 to move.

[0057] according to Figure 1 and Figure 3 As shown, the rotating component 131 includes a knob 131a and a screw 131b. The knob 131a is fixed to one end of the screw 131b. By rotating the knob 131a, the screw 131b is driven to rotate. The rotating component 131 only rotates around its own central axis and does not move.

[0058] The slider 132 slides along the sliding guide 133, driving the first lens 121 and the display screen 110 to move, so that the relative position of the display screen 110 and other lenses in the lens assembly changes, and the relative position of the first lens 121 and other lenses in the lens assembly also changes, so as to change the virtual image distance of the AR module and achieve different refractive powers.

[0059] The sliding guide is used as a guide rail for the slider to move. The sliding guide can be a pin. The number of sliding guides can be one or more. The number of first through holes provided in the slider is the same as the number of sliding guides, that is, one sliding guide corresponds to one first through hole. Figure 1 and Figure 3 As shown, there are two sliding guides, and correspondingly, the slider has two first through holes, see Figure 4 Slider shown.

[0060] according to Figure 4 As shown, the slider 132 is provided with a threaded hole 132a. The portion of the rotating component provided with an external thread is built into the threaded hole 132a. The slider 132 is provided with two first through holes 132b. The two sliding guides respectively penetrate the corresponding first through holes. Figure 4 and Figure 5 As shown, the slider 132 is provided with reinforcing ribs 132c. The reinforcing ribs 132c can significantly improve the bearing capacity of the structure, prevent deformation, and enhance the overall stability of the structure.

[0061] In some embodiments, according to Figure 1 and Figure 3 As shown, the focusing mechanism further includes a first structural member 134, a second structural member 135 and a buckle 136. The first structural member 134 and the second structural member 135 are fixedly connected. The buckle 136 is fixed on the first structural member 134. The sliding guide member 133 is fixed on the second structural member 135.

[0062] The first structural member 134 is provided with a third through hole. The rotating member 131 passes through the third through hole. The rotating member 131 is provided with a slot along the circumference. The buckle 136 is disposed in the slot. The buckle 136 is used to limit the movement of the rotating member 131 when the rotating member 131 rotates, that is, when the rotating member 131 rotates, the rotating member 131 does not move relative to the first structural member 134.

[0063] In some embodiments, the focusing mechanism further includes a structural member and a buckle. The buckle is fixed to the structural member. The sliding guide is fixed to the structural member. The structural member is provided with a second through hole. The rotating member passes through the second through hole. The rotating member is provided with a slot along the circumference. The buckle is arranged in the slot. The buckle is used to limit the movement of the rotating member when the rotating member rotates, that is, when the rotating member rotates, the position of the rotating member relative to the first structural member does not move.

[0064] An embodiment of the present invention provides an active alignment method for an AR module, which is applied to the AR module provided by any of the above embodiments. Figure 6 As shown, the active alignment method of the AR module includes the following steps S610 to S140.

[0065] Step S610: The fixed display screen, lens assembly and focusing mechanism are all arranged on an active alignment device.

[0066] In some embodiments, before step S610, the method further includes: fixing the display screen and the lens assembly so that the display screen and the first lens are visually aligned; and assembling the components in the focusing mechanism.

[0067] The visual alignment is that the center position of the display screen and the center position of the first lens coincide with each other, and the alignment is set according to the boundary of the display screen and the boundary of the first lens. The boundary of the display screen and the boundary of the first lens can be aligned so that the boundary of the display screen and the boundary of the first lens in a predetermined direction are parallel to each other.

[0068] by Figure 1 and Figure 2 Taking the focusing mechanism shown as an example, first fix the sliding guide to the second structural member, and the position accuracy of the pin requires that its verticality relative to the positioning surface of the second structural member is less than 0.2°. Fix the rotating component to the first structural member with a buckle to ensure that the rotating component rotates smoothly on the first structural member. Install the slider to the rotating component through threaded fitting. Apply lubricating oil to the sliding guide and the rotating component. Then pass the sliding guide through the first through hole of the slider, and the inner diameter of the first through hole is larger than the outer diameter of the sliding guide.

[0069] Step S620, controlling the first motion mechanism of the active alignment device to drive the focusing mechanism to move so that the focusing mechanism is at a preset position, where the preset position is a position where the diopter of the AR module is a preset diopter.

[0070] In some embodiments, the preset position is the position where the refractive power of the AR module is 0D.

[0071] Step S630, controlling the second motion mechanism of the active alignment device to drive the fixed display screen and lens assembly to move and / or rotate, so that the diopter corresponding to the fixed display screen and lens assembly is the preset diopter.

[0072] In some embodiments, the second motion mechanism is a six-degree-of-freedom mechanism that can drive the fixed display screen and lens assembly to move and / or rotate.

[0073] In some embodiments, step S630 specifically includes: controlling the active alignment device to drive the fixed display screen and lens assembly to move and / or rotate; controlling the display screen to display a calibration image; using a camera to capture the calibration image displayed on the display screen to obtain a captured image; when the captured image does not overlap with the calibration image or the quality of the captured image does not meet the preset requirements, controlling the active alignment device to drive the fixed display screen and lens assembly to continue to move and / or rotate until the captured image overlaps with the calibration image and the quality of the captured image meets the preset requirements.

[0074] The calibration image may be a crosshair image. The captured image and the calibration image overlap when the crosshairs in the captured image overlap with the crosshairs in the calibration image.

[0075] The quality of the captured image does not meet the preset requirement when the MTF value of the captured image does not exceed the preset value. The optical transfer function (OTF) is a function used to evaluate image quality in an optical imaging system. The optical transfer function consists of the modulation transfer function (MTF) and the phase transfer function (PTF). Among them, MTF can be used to represent the characteristics of an optical system. The larger the MTF, the better the imaging quality of the optical system.

[0076] Step S640, fix the fixed display screen, lens assembly, and focusing mechanism to obtain an assembled AR module.

[0077] In some embodiments, after step S640, the method further includes: detecting the imaging quality of the assembled AR module; and determining that the AR module is a qualified product when the imaging quality of the assembled AR module meets preset requirements.

[0078] The AR module active alignment method provided by the embodiment of the present invention can improve the accuracy of AR module assembly.

[0079] An embodiment of the present invention provides an active alignment device for an AR module, comprising: a controller, a first motion mechanism, and a second motion mechanism. The controller is used to set the fixed display screen, lens assembly, and focusing mechanism on the active alignment device; control the first motion mechanism of the active alignment device to drive the focusing mechanism to move, so that the focusing mechanism is in a preset position, and the preset position is a position where the diopter of the AR module is a preset diopter; control the second motion mechanism of the active alignment device to drive the fixed display screen and lens assembly to move and / or rotate, so that the diopter corresponding to the fixed display screen and lens assembly is the preset diopter; fix the fixed display screen, lens assembly, and focusing mechanism to obtain an assembled AR module.

[0080] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0081] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0082] The embodiments of the present specification may be systems, methods and / or computer program products. The computer program product may include a computer-readable storage medium carrying computer instructions for causing a processor to implement various aspects of the embodiments of the present specification.

[0083] A computer-readable storage medium may be a tangible device that can hold and store computer instructions used by a computer instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which computer instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0084] The computer instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer instructions from the network and forwards the computer instructions for storage in the computer-readable storage medium in each computing / processing device.

[0085] The flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the systems, methods and computer program products according to the multiple embodiments of this specification. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a computer instruction, and a part of a module, a program segment or a computer instruction contains one or more executable computer instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or the flowchart, and the combination of the boxes in the block diagram and / or the flowchart can be implemented by a dedicated hardware-based system that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions. It is well known to those skilled in the art that it is equivalent to implement it by hardware, implement it by software, and implement it by combining software and hardware.

[0086] The embodiments of the present specification have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An AR module, characterized in that: include: Display screen, lens assembly and focusing mechanism, wherein: The lens assembly includes a plurality of lenses, the display screen is fixedly connected to a first lens in the lens assembly, and the first lens is fixedly connected to the focusing mechanism. The focusing mechanism is used to drive the first lens and the display screen to move, so that the relative position of the display screen and other lenses in the lens assembly changes, so as to achieve focusing.

2. The AR module according to claim 1, characterized in that: The first lens includes a first optical surface, a second optical surface and a first fixed plane. The first lens is fixedly connected to the display screen via the first optical surface. The first lens is fixedly connected to the focusing mechanism via the first fixed plane.

3. The AR module according to claim 2, characterized in that: A positioning piece is disposed on the first optical surface, and the first lens is fixedly connected to the display screen via the positioning piece.

4. The AR module according to claim 1, characterized in that: The focusing mechanism includes a rotating component, a slider and a sliding guide, wherein the rotating component is provided with an external thread, the slider is provided with a threaded hole, the portion of the rotating component provided with the external thread is built into the threaded hole, the slider is also provided with a first through hole, the sliding guide penetrates the first through hole, the slider is fixedly connected to the first lens, and the rotating component is used to drive the slider to slide along the sliding guide when the rotating component itself only rotates, thereby driving the first lens and the display screen to move.

5. The AR module according to claim 1, characterized in that: The focusing mechanism further comprises a structural member and a buckle, wherein the buckle is fixed on the structural member, and the sliding guide is fixed on the structural member. The structural member is provided with a second through hole, the rotating component passes through the second through hole, the rotating component is provided with a slot along the circumference, the buckle is arranged in the slot, and the buckle is used to limit the movement of the rotating component when the rotating component rotates.

6. The AR module according to claim 1, characterized in that: The focusing mechanism further includes a first structural member, a second structural member and a buckle, wherein the first structural member and the second structural member are fixedly connected, the buckle is fixed on the first structural member, and the sliding guide is fixed on the second structural member. The first structural member is provided with a third through hole, the rotating component passes through the third through hole, the rotating component is provided with a slot along the circumference, the buckle is arranged in the slot, and the buckle is used to limit the movement of the rotating component when the rotating component rotates.

7. An active alignment method for an AR module, characterized in that: The AR module according to any one of claims 1 to 6 comprises: The fixed display screen, lens assembly and the focusing mechanism are all arranged on an active alignment device; Controlling the first motion mechanism of the active alignment device to drive the focusing mechanism to move so that the focusing mechanism is at a preset position, where the diopter of the AR module is a preset diopter; Controlling the second motion mechanism of the active alignment device to drive the fixed display screen and lens assembly to move and / or rotate, so that the diopter corresponding to the fixed display screen and lens assembly is a preset diopter; The fixed display screen and lens assembly and the focusing mechanism are fixed to obtain an assembled AR module.

8. The method according to claim 7, characterized in that The second motion mechanism controlling the active alignment device drives the fixed display screen and lens assembly to move and / or rotate so that the diopter corresponding to the fixed display screen and lens assembly is a preset diopter, including: Controlling the active alignment device to drive the fixed display screen and lens assembly to move and / or rotate; Controlling the display screen to display a calibration image; Using a camera to capture the calibration image displayed on the display screen to obtain a captured image; When the captured image does not coincide with the calibration image or the quality of the captured image does not meet the preset requirements, the active alignment device is controlled to drive the fixed display screen and lens assembly to continue to move and / or rotate until the captured image coincides with the calibration image and the quality of the captured image meets the preset requirements.

9. The method according to claim 7, characterized in that: The method further comprises: Detecting the imaging quality of the assembled AR module; When the imaging quality of the assembled AR module meets the preset requirements, the AR module is determined to be a qualified product.

10. An active alignment device for an AR module, characterized in that: The alignment of the AR module according to any one of claims 1 to 6 comprises: a controller, a first motion mechanism and a second motion mechanism, wherein the controller is used to set the fixed display screen and lens assembly and the focusing mechanism on an active alignment device; Controlling the first motion mechanism of the active alignment device to drive the focusing mechanism to move so that the focusing mechanism is at a preset position, where the diopter of the AR module is a preset diopter; Controlling the second motion mechanism of the active alignment device to drive the fixed display screen and lens assembly to move and / or rotate, so that the diopter corresponding to the fixed display screen and lens assembly is a preset diopter; The fixed display screen and lens assembly and the focusing mechanism are fixed to obtain an assembled AR module.

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