WO2022143204A1

WO2022143204A1 - Augmented reality optical system and augmented reality glasses

Info

Publication number: WO2022143204A1
Application number: PCT/CN2021/138938
Authority: WO
Inventors: 朱璐璐
Original assignee: 华为技术有限公司
Priority date: 2020-12-29
Filing date: 2021-12-16
Publication date: 2022-07-07
Also published as: CN214335365U

Abstract

An augmented reality optical system and augmented reality glasses, the augmented reality optical system comprising: a light waveguide (100), a laser module (200) and a galvanometer (300). The light waveguide (100) is provided with an in-coupling zone (11), an out-coupling zone (12) and a transfer zone (13). An angle between the direction of a light beam emitted by the laser module (200) and the plane on which the light waveguide (100) is located is not less than 60 degrees. The laser module (200) is configured for emitting a light beam, the transfer zone (13) is configured for receiving the light beam from the laser module (200) and diffracting the light beam to the galvanometer (300), the galvanometer (300) is configured for scanning and reflecting the light beam to the in-coupling zone (11), the in-coupling zone (11) is configured for coupling the light beam to the light waveguide (100) such that the light beam propagates by total reflection in the light waveguide (100), and the out-coupling zone (12) is configured for coupling the light beam totally reflected by the light waveguide (100) out to a human eye for imaging. By means of the augmented reality optical system and augmented reality glasses, display effects of AR glasses are improved, and internal space is saved.

Description

Augmented reality optics and augmented reality glasses

This application claims the priority of the Chinese patent application with the application number 202023273467.3 and the application name "Augmented Reality Optical System and Augmented Reality Glasses" filed with the China Patent Office on December 29, 2020, the entire contents of which are incorporated herein by reference middle.

technical field

The present application relates to the technical field of augmented reality, and in particular, to an augmented reality optical system and augmented reality glasses.

Background technique

Augmented reality (AR) technology is a technology that calculates the position and angle of an image emitted by a light engine system (also called a projector or an optical machine) in real time and adds the corresponding image. Since augmented reality technology enables the interaction between the virtual world and the real world, it has been widely used in augmented reality devices, such as AR glasses, which can project virtual images into the human eyes and realize the superposition of virtual images and real images.

In the related art, the optical system of the augmented reality glasses includes a scheme of combining an optical waveguide and an optical engine. The laser beam emitted by the laser module is incident on the reflector, and after being reflected by the reflector, it is incident on the galvanometer, and the reflected laser beam is scanned by the galvanometer. The light beam is incident on the coupling-in area of the optical waveguide, and after propagating in the optical waveguide, it exits through the coupling-out area, which can reach the human eye.

However, the reflector may affect the display effect of the AR glasses, and because it needs to occupy a certain space, it affects the structural design of the AR glasses.

Utility model content

Embodiments of the present application provide an augmented reality optical system and augmented reality glasses, which can improve the display effect of the AR glasses and save internal space.

On the one hand, the embodiments of the present application provide an augmented reality optical system, including: an optical waveguide, a laser module, and a galvanometer; the optical waveguide is provided with a coupling-in area, an out-coupling area, and a transfer area, and the direction of the beam emitted by the laser module is the same as the direction of the beam emitted by the laser module. The included angle of the plane where the optical waveguide is located is not less than 60 degrees. The laser module is used to emit the beam, and the transfer area is used to receive the beam from the laser module and diffract the beam to the galvanometer. The galvanometer is used to scan and reflect the beam to the coupling The in-coupling region is used for coupling the light beam into the optical waveguide so that the light beam propagates through total reflection in the optical waveguide, and the coupling-out region is used for coupling out the light beam totally reflected by the optical waveguide to the human eye for imaging.

In the augmented reality optical system provided by the embodiment of the present application, by setting an additional transit area on the optical waveguide, the light beam emitted by the laser module can be diffracted through the additional transit area first, then scanned and reflected by the galvanometer, and then passed through the optical waveguide. The coupling-in area on the optical waveguide is coupled into the optical waveguide, and the additional transfer area set on the optical waveguide can play the role of light turning, avoiding the problems of poor display and poor appearance caused by the addition of mirrors, making the laser mode Group and galvo position settings are more flexible.

In a possible implementation manner, the transit area includes a first transit area and a second transit area, the first transit area and the second transit area are configured to diffract light rays at different preset angles respectively, and the first transit area It is used for receiving the light beam from the laser module and diffracting the light beam to the second transfer area, and the second transfer area is used for diffracting the light beam to the galvanometer.

Setting two transit areas to turn the light can further improve the flexibility of the position setting of the laser module and the galvanometer on the basis of avoiding the problems of poor display and poor appearance caused by the addition of reflectors.

In a possible implementation, the galvanometer is a two-dimensional galvanometer.

The two-dimensional galvanometer can rotate and vibrate the light beam in two directions at the same time, and one optical waveguide can be equipped with a corresponding two-dimensional galvanometer. At this time, the number of parts of the optical engine of the optical system is small, which is beneficial to the structural design and appearance design.

In a possible implementation, the transfer area includes a first transfer area and a second transfer area, the galvanometer includes a first galvanometer and a second galvanometer, and the first galvanometer and the second galvanometer are both one-dimensional galvanometers And the directions of rotation and vibration are perpendicular to each other, the first transit area is used to receive the beam from the laser module and diffract the beam to the first galvanometer, the first galvanometer is used to scan and reflect the beam to the second transit area, the second transit area Used to diffract the beam to a second galvo mirror that scans and reflects the beam to the coupling-in region.

The image obtained after two scans of the first galvanometer and the second galvanometer has a better display effect. At this time, the two transfer areas are set corresponding to the two galvanometers to realize two light turns.

In a possible implementation manner, the first transit area is configured to diffract light at a preset angle, and the second transit area is configured to diffract light within a preset angle range, wherein the size of the first transit area is smaller than The size of the second staging area.

The first transfer area is used to diffract the light with a fixed angle from the laser module. After scanning by the first galvanometer, the beam size becomes larger and the angle range increases. The size and diffraction characteristics of the second transfer area can be set. Adapt to the light scanned by the first galvanometer.

In a possible implementation manner, gratings are respectively provided on the coupling-in region and the coupling-out region, and the coupling-in region and the coupling-out region are configured to diffract light at any angle.

The coupling-in region is used to couple light at any angle into the optical waveguide, and the coupling-out region is used to couple light at any angle out. The functions of the coupling-in region and the coupling-out region can be easily realized through the diffraction of the grating.

In a possible implementation manner, the transfer area is arranged next to the coupling-in area, and the size of the transfer area is not smaller than the spot size of the beam emitted by the laser module.

The transit area can be set close to the coupling area to shorten the propagation path of the light, making the grating layout on the optical waveguide more compact, which is beneficial to the miniaturized design of the optical waveguide. The size of the transit area can be no smaller than the size of the laser beam emitted by the laser module. The spot size is so that the transit area can reflect all the beams emitted by the laser module to the galvanometer.

In a possible implementation, the transition region is a holographic grating or a metasurface structure.

Using a holographic grating or a metasurface structure as a transition area can achieve the function of diffracting light to turn the path.

Another aspect of the embodiments of the present application provides augmented reality glasses, including a lens, a frame, temples, and the above augmented reality optical system, where the lens is installed in the frame, and the temples are connected on both sides of the frame.

When the above-mentioned augmented reality optical system is applied to augmented reality glasses, due to the setting of the additional transit area on the optical waveguide, it can play the role of light turning, so the position setting of the laser module and the galvanometer is more flexible, which can reduce the structural design. Difficulty and improve the aesthetics of the appearance.

In a possible implementation manner, the lens includes an optical waveguide, the laser module is arranged on the temple, and the galvanometer is arranged on the temple or the frame.

Setting the laser module on the temple and the galvanometer on the temple or the frame can make the light engine more compact in structure and smaller in size, which is beneficial to the miniaturized design and aesthetic appearance of AR glasses.

In the augmented reality optical system and augmented reality glasses provided by the embodiments of the present application, by setting an additional transit area on the optical waveguide, the light beam emitted by the laser module can be diffracted through the additional transit area first, and then scanned and reflected by the galvanometer. It is then coupled into the optical waveguide through the coupling-in area on the optical waveguide. The additional transit area set on the optical waveguide can play the role of light turning and avoid the problems of poor display and poor appearance caused by the addition of mirrors. , which makes the position setting of the laser module and the galvanometer more flexible, and can be set on the temples to improve the display effect of AR glasses and save internal space.

Description of drawings

FIG. 1 is a schematic top view of AR glasses provided by an embodiment of the present application;

FIG. 2 is a schematic front view of AR glasses provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of the principle of an AR optical system provided by an embodiment of the present application;

FIG. 4 is a schematic structural diagram of an optical waveguide provided by an embodiment of the present application;

5 is a schematic top view of an AR optical system provided by the related art;

6 is another schematic top view of the AR optical system provided by the related art;

7 is another schematic top view of the AR optical system provided by the related art;

8 is another schematic top view of the AR optical system provided by the related art;

9 is a schematic top view of an AR optical system provided by an embodiment of the present application;

10 is a schematic front view of an optical waveguide provided by an embodiment of the application;

11a and 11b are schematic structural diagrams of a transfer area provided by an embodiment of the application;

12 is another schematic top view of the AR optical system provided by an embodiment of the application;

13 is another schematic front view of an optical waveguide provided by an embodiment of the application;

14 is another schematic side view of an AR optical system provided by an embodiment of the application;

FIG. 15 is another schematic front view of an optical waveguide provided by an embodiment of the present application.

Description of reference numbers:

A-lens; B-temple; C-frame; 100-optical waveguide; 10-substrate; 11-coupling area; 12-coupling area; 13-transfer area; 131, 133-first transfer area; 132 , 134 - the second transfer area; 200 - the laser module; 300 - the galvanometer; 31 - the first galvanometer; 32 - the second galvanometer; 400 - the mirror.

Detailed ways

Embodiments of the present application provide augmented reality AR glasses, where the AR glasses may have functions such as optical display, camera, audio, and interaction. The structure of AR glasses can use the structure of ordinary glasses as a carrier. By adding an optical system, a virtual image can be projected into the human eye to realize the superposition of the virtual image and the real image, and realize the function of optical display.

It should be noted that, in the drawings in the embodiments of the present application, the X-axis may be defined as the length direction of the AR glasses, that is, the direction from the left eye to the right eye when the user wears the AR glasses, and the Y-axis may be defined as the thickness direction of the AR glasses, That is, the extension direction of the temples, and the Z-axis is defined as the width direction of the AR glasses, that is, the direction from the eyes to the forehead when the user wears the AR glasses.

FIG. 1 is a schematic top view of AR glasses according to an embodiment of the application, and FIG. 2 is a schematic front view of the AR glasses according to an embodiment of the application. Referring to Figures 1 and 2, the AR glasses include a lens A, a temple B and a frame C. The frame C can be connected above the lens A, and the extension direction of the temple B is nearly perpendicular to the plane where the lens A is located, for example The extension direction of the temple B and the plane where the lens A is located is not less than 60 degrees. It is not difficult to understand that when the user wears the AR glasses, the lens A is located in front of the user's eyes, and the temple B is erected above the user's ear.

The AR glasses are also provided with an optical system, which can be implemented in various ways, such as a beam splitter that projects the light from the display source to a 45-degree angle, and the light reflected by the beam splitter is guided to the eye by a combiner. Birdbath optical design; Pinhole effect applied to micromirrors, using tiny mirrors to reflect light from microdisplays and directing it into the eye Pin Mirror scheme; optical design using the polarization and reflection of prisms; light engines for image generation and light The image generated by the engine is transmitted to the optical waveguide combination scheme of human eye imaging, etc.

For the scheme of combining light engine and optical waveguide, the light engine can be DLP (Digital Light Processing) light engine, LCOS (Liquid Crystal on Silicon) light engine, LBS (Laser Bean Scanning, laser scanning display projection) light engine, Micro LED (miniature light-emitting diode) light engine, etc., the optical waveguide can be a diffractive optical waveguide, a holographic optical waveguide, an array optical waveguide, etc. The embodiments of the present application provide an AR optical system, which adopts a solution of an optical waveguide plus an LBS optical engine. The working principle of the AR optical system is described below with reference to the accompanying drawings.

FIG. 3 is a schematic diagram of the principle of an AR optical system provided by an embodiment of the application, and FIG. 4 is a schematic structural diagram of an optical waveguide provided by an embodiment of the application. Referring to FIG. 3 and FIG. 4 , an embodiment of the present application provides an AR optical system, including an optical waveguide 100 and an optical engine. The optical engine includes a laser module 200 and a galvanometer 300. The working principle of the optical engine is that the laser module 200 The outgoing laser beam is incident on the galvanometer 300, and the galvanometer 300 rotates and vibrates to scan a laser beam into an image.

The optical waveguide 100 includes a substrate 10 and an in-coupling region 11 and an out-coupling region 12 disposed on the substrate 10. The coupling-in region 11 and the coupling-out region 12 are disposed on one side surface of the substrate 10, and the light beam emitted by the LBS light engine is incident. To the coupling-in region 11, after the optical waveguide 100 propagates through total reflection, it exits through the coupling-out region 12, and finally can be received by the human eye.

The laser module includes one or more laser light sources and one or more optical lens groups. The function of the optical lens group is to shape the laser light emitted by the laser, so that the laser beam becomes a parallel beam with a circular spot, or has a Beams with other spot shapes and divergence angles. The laser light source can be of the same color or of multiple colors. The optical lens group includes, but is not limited to, a condenser lens, a collimating lens, a beam combining prism, and a beam combining waveguide. In addition, the laser module may also contain other related devices such as laser power detectors.

The galvanometer 300 can be a MEMS (Micro-Electro-Mechanical Systems) galvanometer. The MEMS galvanometer is a micro-electromechanical system device. The galvanometer is rotated and vibrated around the central axis by means of an applied voltage, and the incident laser beam is oscillated at different times. The reflection angle is different, and an image is formed by the persistence of vision effect of the human eye. The MEMS galvanometer can be a one-dimensional galvanometer or a two-dimensional galvanometer. One-dimensional galvanometers have only one rotation axis, and two-dimensional galvanometers have two mutually perpendicular rotation axes.

When the AR optical system shown in FIG. 3 is directly applied to the AR glasses, the optical waveguide 100 is used as the lens A, the laser module 200 and the galvanometer 300 are located on the same side of the optical waveguide 100, and the directions of the emitted beams of the laser module 200 are parallel. In the plane where the optical waveguide 100 is located, at this time, it is necessary to add a structural member on the side of the lens A facing the human eye to install the laser module 200 and the galvanometer 300. It is not difficult to understand that this structural member will increase the structural design of the AR glasses It may block the sight of the glasses, increase the distance between the human eye and the lens A, affect the user's experience and reduce the aesthetics of the AR glasses.

It can be understood that when the above-mentioned solution of optical waveguide plus LBS light engine is applied to AR glasses, the laser module 200 and the galvanometer 300 can be installed on the temple B to reduce the difficulty of structural design and improve the aesthetics of the appearance.

The structures of the AR optical system and AR glasses provided in the related art are described below with reference to the accompanying drawings.

FIG. 5 is a schematic top view of an AR optical system provided by the related art. Referring to FIG. 5 , the AR optical system provided by the related art includes an optical waveguide 100, a laser module 200, a galvanometer 300 and a reflector 400. The direction of the beam emitted by the laser module 200 is perpendicular to the plane where the optical waveguide 100 is located, and the reflection The mirror 400 , the laser module 200 and the galvanometer 300 are all disposed on the side of the optical waveguide 100 facing the human eye. The laser beam emitted by the laser module 200 is incident on the reflector 400 , and after being reflected by the reflector 400 , the laser beam is incident on the galvanometer 300 . Then, it is emitted through the coupling-out area 12 and finally reaches the human eye.

The addition of the reflecting mirror 400 changes the propagation direction of the beam between the laser module 200 and the galvanometer 300, so that the direction of the beam emitted by the laser module 200 is perpendicular to the plane where the optical waveguide 100 is located, even if the laser module 200 The direction of the emitted light beam is consistent with the extending direction of the temple B, so that the laser module 200 and the galvanometer 300 can be installed on the temple B.

However, the reflector 400 itself has a certain size, and a fixed space is required for adjustment, so that the distance between the galvanometer 300 and the optical waveguide 100 is relatively long, so that the light spot scanned by the galvanometer 300 reaches the optical waveguide 100 relatively long. If it is large, a larger area of the coupling region 11 is required, which is very unfavorable for the uniformity of the final display image.

In addition, referring to the dotted line in FIG. 5 , when the angle between the galvanometer 300 and the reflector 400 is constant, if the distance between the galvanometer 300 and the reflector 400 is too close, the light spot emitted after being scanned by the galvanometer 300 may be The coupling region 11 cannot be reached, but the mirror 400 is reached, thus resulting in an incomplete display image.

By changing the angles of the galvanometer 300 and the reflector 400 , the incident angle of the light reflected by the reflector 400 on the galvanometer 300 is increased, and the distance between the reflector 400 and the galvanometer 300 can be reduced. However, for the same galvanometer 300, the maximum mechanical angle of rotational vibration is fixed, and the incident angle of light is 0°, that is, when the incident angle is vertical, the scanned field of view is the largest. The smaller the field of view. Therefore, when the distance between the reflector 400 and the galvanometer 300 is short, the incident angle of the light on the galvanometer 300 is relatively large, which results in a smaller field of view scanned by the galvanometer 300, which affects the user's field of vision.

FIG. 6 is another schematic top view of the AR optical system provided by the related art. Referring to FIG. 6 , in another related art, the AR optical system includes an optical waveguide 100, a laser module 200, a galvanometer 300 and a reflector 400. The reflector 400 is disposed on the side of the optical waveguide 100 away from the human eye, The laser module 200 and the galvanometer 300 are both disposed on the side of the optical waveguide 100 facing the human eye, and the direction of the light beam emitted by the laser module 200 is perpendicular to the plane where the optical waveguide 100 is located. The laser beam emitted from the laser module 200 passes through the non-coupling area on the optical waveguide 100, and then enters the mirror 400. After being reflected by the mirror 400, the laser beam passes through the non-coupling area of the optical waveguide 100 and enters the vibration mirror. On the mirror 300 , the light beam scanned and reflected by the galvanometer 300 is incident on the coupling-in region 11 , propagates in the optical waveguide 100 and exits through the coupling-out region 12 , and finally reaches the human eye.

Compared with the solution in FIG. 5 , in the solution provided in FIG. 6 , since the reflector 400 , the galvanometer 300 and the laser module 200 are arranged on different sides, the size and adjustment space of the reflector 400 will not cause the galvanometer 300 to be in contact with the light. The distance between the waveguides 100 is increased, and the distance between the reflection mirror 400 and the galvanometer 300 can be increased, so that the uniformity and integrity of the display screen and the field of view of the galvanometer 300 are not affected. However, the reflector 400 is located on the side of the optical waveguide 100 away from the human eye, and this component cannot be structurally integrated into the temple B, and a separate structural component needs to be provided for installation, resulting in a complicated structure of the AR glasses and causing The outer side of the lens A of the AR glasses protrudes a part of the structure, which has a great influence on the appearance of the AR glasses.

FIG. 7 is another schematic top view of the AR optical system provided by the related art. Referring to FIG. 7, in another related art, the AR optical system includes an optical waveguide 100, a laser module 200, and a galvanometer 300 reflector 400. The direction of the beam emitted by the laser module 200 is perpendicular to the plane where the optical waveguide 100 is located, The galvanometer 300 is arranged on the side of the optical waveguide 100 away from the human eye, and the laser module 200 is arranged on the side of the optical waveguide 100 facing the human eye. The laser beam emitted by the laser module 200 passes through the non-coupling area on the optical waveguide 100 , and is then incident on the galvanometer 300 . The beam scanned and reflected by the galvanometer 300 is incident on the coupling area 11 . After transmission, it is emitted through the coupling-out area 12 and finally reaches the human eye.

FIG. 8 is another schematic top view of the AR optical system provided by the related art. Referring to FIG. 8 , in another related art, the AR optical system includes an optical waveguide 100 , a laser module 200 and a galvanometer 300 reflecting mirror 400 , and the direction of the beam emitted by the laser module 200 is perpendicular to the plane where the optical waveguide 100 is located, The laser module 200 is arranged on the side of the optical waveguide 100 away from the human eye, and the galvanometer 300 is arranged on the side of the optical waveguide 100 facing the human eye. The laser beam emitted by the laser module 200 passes through the non-coupling area on the optical waveguide 100 , and then enters the galvanometer 300 . The beam scanned and reflected by the galvanometer 300 enters the coupling area 11 and propagates in the optical waveguide 100 Then, it is emitted through the coupling-out area 12 and finally reaches the human eye.

In the solutions provided in FIGS. 7 and 8 , some components of the LBS light engine are located on the side of the optical waveguide 100 away from the human eye. These components cannot be structurally integrated into the temple B, and a separate structural component needs to be provided for installation, resulting in The structure of the AR glasses is complex, and the outer side of the lens A of the AR glasses will protrude a part of the structure, which has a great impact on the appearance of the AR glasses.

Based on the above problems, the embodiments of the present application provide an augmented reality optical system and augmented reality glasses. By setting an additional transit area on the optical waveguide, the light beam emitted by the laser module can first pass through the additional transit area for diffraction, and then pass through the additional transit area. The galvanometer scans and reflects, and is then coupled into the optical waveguide through the coupling area on the optical waveguide. The additional transit area set on the optical waveguide can play the role of light turning and avoid poor display and beautiful appearance caused by the addition of a reflector. The problem of low performance makes the position setting of the laser module and the galvanometer more flexible, and can be set on the temples to improve the display effect and aesthetic appearance of the AR glasses.

The AR optical system and AR glasses provided by the present application will be described below with reference to the accompanying drawings and specific embodiments.

Example 1

FIG. 9 is a schematic top view of an AR optical system according to an embodiment of the application, and FIG. 10 is a schematic front view of an optical waveguide according to an embodiment of the application. Referring to FIG. 9 and FIG. 10 , the AR optical system provided by an embodiment of the present application may include an optical waveguide 100 , a laser module 200 and a galvanometer 300 . The optical waveguide 100 includes a substrate 10 and a coupling device disposed on the substrate 10 . The area 11, the coupling-out area 12, the transfer area 13, the laser module 200 and the galvanometer 300 are arranged on the side of the optical waveguide 100 facing the human eye, the laser module 200 is used to emit light beams, and the direction of the emitted light beams is perpendicular to the light The plane where the waveguide 100 is located, the transfer area 13 is used to reflect the incident beam to the galvanometer 300 , the galvanometer 300 is used to scan and reflect the beam to the coupling area 11 , and the coupling area 11 is used to couple the beam into the optical waveguide 100 , the coupling-out region 11 is used for coupling out the light beam to the human eye for imaging.

The beam propagation path of the AR optical system provided by the embodiment of the present application is that the laser beam emitted by the laser module 200 is first incident on the transfer area 13 , and then diffracted by the transfer area 13 , and then incident on the galvanometer 300 , and is scanned and reflected by the galvanometer 300 . The latter light beam is incident on the coupling-in region 11 of the optical waveguide 100 , propagates in the optical waveguide 100 and then exits through the coupling-out region 12 , and finally reaches the human eye.

Wherein, the galvanometer 300 is a two-dimensional galvanometer, which has two mutually perpendicular rotation axes, and can rotate and vibrate the light beam in two directions at the same time to form an image by scanning. One optical waveguide 100 may be provided with one two-dimensional galvanometer, and the number of transit areas 13 may be one, corresponding to one galvanometer 300 . At this time, the number of components of the light engine of the AR optical system is small, which is beneficial to the structural design and appearance design of the AR optical system.

The coupling-in region 11, the coupling-out region 12 and the transfer region 13 can all be grating regions disposed on the substrate 10, but the coupling-in region 11 and the coupling-out region 12 can diffract light at any angle, and the transfer region 13 only The light beam with a fixed angle from the laser module 200 is diffracted, that is, the grating implementation manners of the transfer area 13 and the coupling-in area 11 and the coupling-out area 12 are inconsistent.

In addition to various types of gratings such as holographic gratings, the transition region 13 can also be a metasurface structure, which can realize the function of turning light. 11a and 11b are schematic structural diagrams of a transfer area provided by an embodiment of the present application. Specifically, the transit region 13 may be the holographic grating shown in FIG. 11a, or the metasurface structure shown in FIG. 11b.

The transfer area 13 can be disposed adjacent to the coupling area 11 to shorten the propagation path of light, make the grating layout on the optical waveguide 100 more compact, and facilitate the miniaturized design of the optical waveguide 100 . The transfer area 13 may be disposed outside the area of the optical waveguide 100 where the total reflection optical path is located, so as to prevent the transfer area 13 from affecting the total reflection propagation of the light beam between the coupling-in region 11 and the coupling-out region 12 . It should be noted that the area where the total reflection optical path is located, that is, the area where the light beam coupled into the coupling-in region 11 on the optical waveguide 100 is totally reflected to the coupling-out region 12 can be located between the coupling-in region 11 and the coupling-out region 12 10 , the region where the full emission optical path is located may be, for example, within the range of the left and lower sides of the coupling-in region 11 and the right and upper regions of the coupling-out region 12 . At this time, the transfer region 13 may be set at The right or upper side of the coupling region 11 .

The shape and size of the transfer area 13 are not specifically limited in the embodiments of the present application. The transfer area 13 may be circular, square, oval or any other shape, and the size of the transfer area 13 may not be smaller than or close to the laser module 200 The spot size of the emitted laser beam is such that the transfer area 13 can fully reflect the beam emitted by the laser module 200 to the galvanometer 300 . Moreover, it is not difficult to understand that the size of the transit area 13 is also restricted by the size of the optical waveguide 100 , and the size of the transit area 13 is not larger than the maximum size that the optical waveguide 100 can accommodate.

In the AR optical system provided in the embodiment of the present application, the transit area 13 may be disposed at the edge area of the optical waveguide 100 and face the laser module 200 . The light beam emitted by the laser module 200 to the transit area 13 and the plane where the optical waveguide 100 is located It can be close to vertical, such as not less than 60 degrees. In the corresponding AR optical glasses, the laser module 200 and the galvanometer 300 can be arranged in the temple B. At this time, the transfer area 13 can face the laser module 200 on the temple B, and is located on the lens A and close to the temple B. edge area.

Compared with the solution in which the mirror 400 is arranged in the related art in FIG. 5 , in the embodiment of the present application, the relay area 13 is arranged on the optical waveguide 100 as a light turning device, which can reduce the distance between the galvanometer 300 and the optical waveguide 100 . Thus, the area of the coupling-in area 11 is reduced, and the uniformity of the display screen is improved; and the incident angle of the laser beam to the galvanometer 300 can be reduced, so that the same mechanical rotation angle of the galvanometer 300 can obtain a larger field of view. ; And, the structure of the light engine can be made more compact and the volume is smaller, and the light engine can be integrated on the temple of the AR glasses, which is beneficial to the miniaturized design and aesthetic appearance of the AR glasses.

Embodiment 2

FIG. 12 is another schematic top view of the AR optical system provided by an embodiment of the application, and FIG. 13 is another schematic front view of the optical waveguide provided by an embodiment of the application. Referring to FIG. 12 and FIG. 13 , the AR optical system provided by an embodiment of the present application may include an optical waveguide 100 , a laser module 200 and a galvanometer 300 . The optical waveguide 100 includes a substrate 10 and a coupling device disposed on the substrate 10 . Zone 11, coupling-out zone 12, first transfer zone 131 and second transfer zone 132, the laser module 200 and the galvanometer 300 are arranged on the side of the optical waveguide 100 facing the human eye, and the direction of the beam emitted by the laser module 200 is vertical in the plane where the optical waveguide 100 is located.

The beam propagation path of the AR optical system provided by the embodiment of the present application is that the laser beam emitted by the laser module 200 is first incident on the first transfer area 131 , and then reaches the second transfer area 132 after diffracting, and then diffracted by the second transfer area 132 . , incident on the galvanometer 300 , the beam scanned and reflected by the galvanometer 300 is incident on the coupling-in area 11 of the optical waveguide 100 , propagates in the optical waveguide 100 and exits through the coupling-out area 12 , and finally reaches the human eye.

The first transfer area 131 is the incident area of the beam emitted by the laser module 200, and the size of the first transfer area 131 may not be smaller than the spot size of the laser beam emitted by the laser module 200, so that all the beams emitted by the laser module 200 Diffraction into the second transfer area 132, and the size of the first transfer area 131 is not larger than the maximum size that the optical waveguide 100 can accommodate.

Both the first relay area 131 and the second relay area 132 may be disposed outside the area where the total reflection optical path is located on the optical waveguide 100. The size and shape of the first relay area 131 may be inconsistent with the size and shape of the second relay area 132. The second transfer area 132 may be disposed adjacent to the coupling-in area 11 , and the second transfer area 132 may be disposed on the side of the coupling-in area 11 close to the first transfer area 131 , so that the light beam entering the optical waveguide 100 through the first transfer area 131 , can enter the second transfer region 132 with the shortest path and diffract to the coupling-in region 11 .

Both the first transfer area 131 and the second transfer area 132 can be configured as gratings or metasurface structures. The first transfer area 131 is used to diffract the light beam with a fixed angle from the laser module 200, and the second transfer area 132 is used to The angle-fixed light rays from the first transit area 131 are diffracted, and the two angles are different.

In the AR optical system provided in this embodiment of the present application, the first transit area 131 may be disposed at the edge area of the optical waveguide 100 and disposed facing the laser module 200 , and the light beam emitted by the laser module 200 to the first transit area 131 and the optical waveguide The plane where 100 is located may be close to vertical, for example, not less than 60 degrees, and there may be a certain interval between the second transfer area 132 and the first transfer area 131 . In the corresponding AR optical glasses, the laser module 200 may be arranged in the temple B, the first transfer area 131 may be arranged facing the laser module 200, and the position of the galvanometer 300 may not be limited to the temple B, but It can be arranged according to the position of the second transfer area 132 and the coupling area 11 , for example, it can be arranged at the position of the frame C above the lens A and the like.

Embodiment 3

FIG. 14 is another schematic side view of the AR optical system provided by an embodiment of the application, and FIG. 15 is another schematic front view of the optical waveguide provided by an embodiment of the application. Referring to FIGS. 14 and 15 , the AR optical system provided in this embodiment of the present application may include an optical waveguide 100 , a laser module 200 , a first galvanometer 31 and a second galvanometer 32 , and the optical waveguide 100 is provided with a coupling Zone 11, coupling-out zone 12, first transfer zone 133 and second transfer zone 134, the laser module 200, the first galvanometer 31 and the second galvanometer 32 are arranged on the side of the optical waveguide 100 facing the human eye, the laser The direction of the light beam emitted by the module 200 is perpendicular to the plane where the optical waveguide 100 is located.

The beam propagation path of the AR optical system provided by the embodiment of the present application is that the laser beam emitted by the laser module 200 is first incident on the first relay area 133 , and after being diffracted by the first relay area 133 , it is incident on the first galvanometer mirror 31 , The beam scanned and reflected by the first galvanometer 31 is incident on the second relay area 134, and after diffracted by the second relay area 134, it is incident on the second galvanometer 32, and the beam scanned and reflected by the second galvanometer 32 is incident on the second galvanometer 32. The coupling-in region 11 of the optical waveguide 100 propagates in the optical waveguide 100 and then exits through the coupling-out region 12, and finally reaches the human eye.

The distance between the second transfer area 134 and the coupling-in area 11 is smaller than the distance between the first transfer area 133 and the coupling-in area 11, and the first transfer area 133, the second transfer area 134, and the coupling-in area 11 can be They are arranged in sequence in one direction and arranged in close proximity to shorten the propagation path of the light, so that the grating layout on the optical waveguide 100 is more compact, which is beneficial to the miniaturized design of the optical waveguide 100 .

Both the first transit area 133 and the second transit area 134 may be holographic gratings or metasurface structures. The first transit area 133 and the second transit area 134 receive light in different directions. The first transit area 133 is configured to be fixed to the preset. The light at the angle is diffracted, that is, the light beam from the laser module 200 , and the second transfer area 134 is configured to diffract the light within the preset angle range, that is, the light beam scanned and reflected by the first galvanometer 31 . The spot size of the beam scanned and reflected by the first galvanometer 31 is larger than that of the beam emitted by the laser module 200 , so the size of the first transfer area 133 is smaller than that of the second transfer area 134 .

In the embodiment of the present application, both the first galvanometer mirror 31 and the second galvanometer mirror 32 may be one-dimensional galvanometer mirrors, and the rotational vibration directions of the first galvanometer mirror 31 and the second galvanometer mirror 32 are perpendicular to each other. The number of the transfer areas 13 is two, corresponding to the two galvanometer mirrors, so as to realize two light turns. The image obtained after two scans of the first galvanometer 31 and the second galvanometer 32 has a better display effect.

In the AR optical system provided by the embodiment of the present application, the first transit area 133 may be disposed at the edge area of the optical waveguide 100 and disposed facing the laser module 200 , and the light beam emitted by the laser module 200 to the first transit area 133 and the optical waveguide The plane on which 100 is located can be close to vertical, for example, not less than 60 degrees. In the corresponding AR optical glasses, the laser module 200 can be arranged in the temple B, and the positions of the first galvanometer 31 and the second galvanometer 32 can be determined according to the first transfer area 133 , the second transfer area 134 and the coupling area 11 . The first galvanometer 31 and the second galvanometer 32 can be arranged on the temple B or on the mirror frame C.

It should be noted that there are various specific structures of the optical waveguide 100. The optical waveguide 100 may include a coupling-in region 11 and an out-coupling region 12, and the light coupled into the optical waveguide 100 through the coupling-in region 11 propagates after total reflection. to the coupling-out region 12 , and then output from the coupling-out region 12 . Alternatively, in another structure of the optical waveguide 100 , in addition to the coupling-in region 11 and the coupling-out region 12 , a relay region (not shown in the figure) may be provided on the optical waveguide 100 , and the coupling-in region 11 is used for coupling in The light inside the optical waveguide 100 can propagate to the relay area through total reflection, and then propagate from the relay area to the outcoupling area 12 , and then exit from the outcoupling area 12 . The optical waveguide 100 may also have other structures, which are not specifically limited in the embodiments of the present application.

In the augmented reality optical system and augmented reality glasses provided by the embodiments of the present application, by setting an additional transit area on the optical waveguide, the light beam emitted by the laser module can be diffracted through the additional transit area first, and then scanned and reflected by the galvanometer. It is then coupled into the optical waveguide through the coupling-in area on the optical waveguide. The additional transit area set on the optical waveguide can play the role of light turning and avoid the problems of poor display and poor appearance caused by the addition of mirrors. , which makes the position setting of the laser module and the galvanometer more flexible, and can be set on the temple or frame to improve the display effect and aesthetic appearance of the AR glasses.

In the embodiments of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or an intermediate medium. The indirect connection can be the internal communication of two elements or the interaction relationship between the two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present application according to specific situations. The terms "first", "second", "third", etc. in the description and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. order.

Furthermore, the terms "comprising" and "having", and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, but not to limit them; It should be understood that: it is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the embodiments of the present application Scope of technical solutions.

Claims

An augmented reality optical system, comprising: an optical waveguide, a laser module and a galvanometer;

The optical waveguide is provided with a coupling-in area, an out-coupling area and a transfer area, the angle between the direction of the beam emitted by the laser module and the plane where the optical waveguide is located is not less than 60 degrees, and the laser module is used for A beam is emitted, and the transfer area is used to receive the beam from the laser module and diffract the beam to the galvanometer, and the galvanometer is used to scan and reflect the beam to the coupling-in area, the coupling-in area The coupling region is used for coupling the light beam into the optical waveguide so that the light beam propagates through total reflection in the optical waveguide, and the coupling-out region is used for coupling out the light beam totally reflected by the optical waveguide to the human eye for imaging.
The augmented reality optical system according to claim 1, wherein the transit area includes a first transit area and a second transit area, and the first transit area and the second transit area are configured to correspond to different The pre-set angle of the light is diffracted, and the first transfer area is used to receive the light beam from the laser module and diffract the light beam to the second transfer area, and the second transfer area is used to diffract the light beam to the galvanometer.
The augmented reality optical system according to claim 2, wherein the galvanometer is a two-dimensional galvanometer.
The augmented reality optical system according to claim 1, wherein the transfer area includes a first transfer area and a second transfer area, the galvanometer includes a first galvanometer and a second galvanometer, and the first galvanometer The galvanometer and the second galvanometer are both one-dimensional galvanometers and the directions of rotation and vibration are perpendicular to each other, and the first transit area is used to receive the beam from the laser module and diffract the beam to the first galvanometer , the first galvanometer is used to scan and reflect the beam to the second transfer area, the second transfer area is used to diffract the beam to the second galvanometer, and the second galvanometer is used for scanning and The light beam is reflected to the coupling-in region.
The augmented reality optical system according to claim 4, wherein the first transit area is configured to diffract light at a preset angle, and the second transit area is configured to diffract light within a preset angle range Diffraction is performed wherein the size of the first transit region is smaller than the size of the second transit region.
The augmented reality optical system according to any one of claims 1-5, wherein gratings are respectively provided on the coupling-in region and the coupling-out region, and the coupling-in region and the coupling-out region are Configured to diffract light at any angle.
The augmented reality optical system according to any one of claims 1-5, wherein the transfer area is disposed adjacent to the coupling-in area, and the size of the transfer area is not smaller than the spot of the beam emitted by the laser module size.
The augmented reality optical system according to any one of claims 1 to 5, wherein the transit area is a holographic grating or a metasurface structure.
An augmented reality glasses, characterized in that it comprises a lens, a frame, a temple and the augmented reality optical system according to any one of claims 1-8, the lens is installed in the frame, and the temple is Attached to both sides of the frame.
The augmented reality glasses according to claim 9, wherein the lens comprises the optical waveguide, the laser module is arranged on the temple, the galvanometer is arranged on the temple or all on the frame.