CN218068459U - Augmented reality device and AR glasses - Google Patents

Abstract

The application provides an augmented reality device and AR glasses, the augmented reality device can include: the device comprises a light source, a first polaroid, an optical waveguide, an imaging module and a reflector with a reflecting surface. The light source is used for emitting light. The first polarizer is located on one side of the light source. The optical waveguide is provided with an incoupling grating and an outcoupling grating, and the incoupling grating is positioned on one side of the first polaroid, which is far away from the light source. The imaging module is positioned on one side of the light coupling grating of the light waveguide. The reflecting surface is positioned between the light source and the coupling grating. All or part of emergent light of the light source is reflected by the reflecting surface, then sequentially passes through the first polaroid and the coupling grating, enters the optical waveguide and then enters the imaging module through the coupling grating. The application provides an augmented reality device can effectively reduce augmented reality device's volume to through set up the reflector that has the plane of reflection between light source and incoupling grating, make the incoupling optical waveguide that can more by the light that the light source sent, improve waveguide incoupling efficiency.

Description

Augmented reality device and AR glasses

Technical Field

The application relates to the technical field of projection equipment, in particular to an augmented reality device and AR glasses.

Background

An optical-mechanical system in an Augmented Reality (AR) device is used for generating a projection display image, and an optical system for providing illumination for a display is generally large in size, and since the AR device has high requirements on size and weight, the wearing comfort of the AR device is seriously affected by a traditional illumination system.

Disclosure of Invention

The embodiment of the application provides an augmented reality device and AR glasses to solve at least one of the above technical problems.

The embodiment of the application realizes the aim through the following technical scheme.

In a first aspect, the present application provides an augmented reality apparatus, which may include: the device comprises a light source, a first polaroid, an optical waveguide, an imaging module and a reflector with a reflecting surface. The light source is used for emitting light rays. The first polarizer is located on one side of the light source. The optical waveguide is provided with an incoupling grating and an outcoupling grating, and the incoupling grating is positioned on one side of the first polaroid, which is far away from the light source. The imaging module is positioned on one side of the light coupling grating of the optical waveguide. The reflecting surface is positioned between the light source and the incoupling grating. All or part of emergent light of the light source is reflected by the reflecting surface, then sequentially passes through the first polaroid and the incoupling grating, enters the optical waveguide, and then enters the imaging module through the incoupling grating.

In one embodiment, an imaging module may include: display, second polaroid and projection lens, the display sets up the optical waveguide is close to one side of coupling grating, the second polaroid sets up the optical waveguide is kept away from one side of coupling grating, projection lens sets up the second polaroid is kept away from one side of optical waveguide, the light warp of light source outgoing pass through in proper order after coupling grating jets out display, second polaroid and projection lens.

In one embodiment, the reflective surface may include a first opening and a second opening; the light source is located at the first opening, and the incoupling grating is located at the second opening.

In one embodiment, the reflective surface is a flat surface or a curved surface.

In one embodiment, the augmented reality apparatus may further include: a collection lens between the light source and the first polarizer or between the first polarizer and the incoupling grating.

In one embodiment, the reflector is a total internal reflection lens, the reflective film of which forms the reflective surface of the reflector.

In one embodiment, the Light source is a Micro Light Emitting Diode (Micro LED) Light source.

In one embodiment, the collection lens may include a first collection lens positioned between the first polarizer and the light source and a second collection lens positioned between the first polarizer and the incoupling grating.

In one embodiment, the first polarizer may be a reflective polarizer.

In a second aspect, the present application provides an augmented reality apparatus, which may include: picture frame, mirror leg and as above-mentioned augmented reality device, the picture frame with the mirror leg is connected, the augmented reality device sets up in the picture frame.

The application provides an augmented reality device and AR glasses can effectively reduce the volume of augmented reality device to through at the light source with the reflector that has the plane of reflection sets up between the incoupling grating, make the incoupling optical waveguide that can more by the light of light source sending, improve waveguide incoupling efficiency.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings may be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram illustrating a basic principle of a conventional LCoS-based projection scheme.

Fig. 2 is a schematic diagram of a SRG-based front lighting scheme.

Fig. 3 is a schematic structural diagram of a conventional augmented reality device.

Fig. 4 is a schematic structural diagram of an augmented reality device according to an embodiment of the application.

FIG. 5 is a diagram illustrating the light collection capability of the reflecting surface according to the embodiment of the present application.

FIG. 6 is a schematic view of the structure of the present application illustrating the light collection capability of the reflecting surface of the present application, wherein the cross-sectional shape of the reflecting surface along the direction perpendicular to the light guide is rectangular.

Fig. 7 is a schematic structural diagram illustrating the light collecting capability of the reflecting surface according to the present invention, wherein the cross-sectional shape of the reflecting surface along the direction perpendicular to the optical waveguide is a trapezoid.

Fig. 8 is a schematic structural diagram illustrating the light collecting capability of the reflecting surface according to the present invention, wherein the cross-sectional shape of the reflecting surface along the direction perpendicular to the optical waveguide is an arc shape.

Fig. 9 is a schematic structural diagram illustrating a first embodiment of the present application in which the cross-sectional shape of the reflection surface along a direction perpendicular to the optical waveguide is an arc shape.

Fig. 10 is a schematic structural diagram illustrating the light collecting capability of the reflecting surface according to the second embodiment of the present invention, wherein the cross-sectional shape of the reflecting surface along the direction perpendicular to the optical waveguide is an arc shape.

Fig. 11 is a schematic structural diagram illustrating a third embodiment of the present application in which the cross-sectional shape of the reflection surface along a direction perpendicular to the optical waveguide is an arc shape.

Fig. 12 is a schematic structure of AR glasses according to an embodiment of the present application.

Reference numerals: the AR glasses 1, the augmented reality device 10, the light source 100, the first polarizer 200, the incoupling grating 300, the light guide 400, the reflector 500, the reflection surface 510, the dodging system 600, the outcoupling grating 700, the collecting lens 800, the first collecting lens 810, the second collecting lens 820, the microdisplay 20, the projection lens 30, the frame 40, the temple 50, and the second polarizer 60.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present application and are not to be construed as limiting the present application.

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Since the modern society, personal computers have been used as the first generation of information interaction platform, and have brought new chapters for the transmission and interaction of information. In recent years, the smart phone terminal which is developed rapidly changes an information interaction platform into lighter and more miniaturized information interaction platform, improves convenience, and further changes human life. With the gradual saturation of the permeability of smart phones, the gradual fatigue of users in fragmented time energization, and the rapid development of new technologies such as big data communication and artificial intelligence, the demand for new-form information interaction platforms is urgent.

Augmented Reality (AR) is a display technology that collects real world information in real time and combines virtual information, images, and the like with the real world, is expected to become a new generation of information interaction terminal following personal computers and smart phones, and has a wide market scale and imagination space. Firstly, in information display, the AR is not limited to an entity screen any more, but can be displayed in the whole physical space, and virtual information is displayed in real time on the basis of a physical entity by adopting a virtual-real combined mode, namely augmented reality display; secondly, in the aspect of human-computer interaction, instruction collection can break through an operation interface of an entity, and a more natural and convenient interaction mode such as voice, gestures, images and the like is used, so that a human-computer interaction mode is more like natural communication with people. Based on the brand-new morphology of AR display, AR technology has gained wide attention and investment in recent years. Since Google Glass was released by Google in 2013, the AR industry has received widespread attention from the capital market; however, the AR industry is slowly developing in the following 2015-2017 years, and the main bottlenecks are that the AR display effect, hardware user experience and product price still cannot meet the expectations of consumers. With the development of advanced technologies such as display technology, communication means, chips and algorithms, in recent years, AR display systems have been gradually applied in some professional fields, which may include many fields such as industry, training, education, viewing, medical treatment, and games.

Compared with the aspects of communication, big data, software algorithm and the like, the performance of the existing AR hardware display system restricts the rapid development of the AR Field to some extent, and meanwhile, the AR display system with the performances of small volume, light weight, high efficiency, large Field of View (FOV) and large movable eyebox range still does not get a breakthrough. An AR hardware display system typically includes two parts, a micro-optical engine (optical engine) and an optical combiner (optical combiner). The main technical route may include a Liquid crystal On Silicon (LCoS), a Laser Beam Scanning, a Micro Light-Emitting Diode (Micro LED), a Micro Organic Light-Emitting semiconductor (Micro OLED), and the like. For AR machines, small volume, high efficiency are crucial parameters. The optical combiner is used for combining actual ambient light and image light, so that human eyes can observe the environment and image information generated by the optical machine at the same time.

An optical-mechanical system in the AR Device is used to generate a projection display image, and a projection system based on LCoS and a Digital Micromirror Device (DMD) is a mainstream in an inactive light emitting chip projection scheme:

LCoS is a new type of microdisplay technology that combines semiconductor and Liquid Crystal Display (LCD) technologies. Technically, the LED display has the advantages of high resolution, high brightness, simple product structure and low cost. LCoS projection display technology has originated in reflective liquid crystal projection displays. The reflection type liquid crystal projection display refers to the mode that the adopted liquid crystal display chip is in a reflection type working mode, a reflecting mirror is arranged behind a liquid crystal layer, and thin films or integrated components related to liquid crystal driving are hidden behind the reflecting mirror. Reflective liquid crystal devices for projection displays use twisted nematic liquid crystals or electrically controlled birefringence because of the high optical efficiency and high contrast of the liquid crystal modes of operation.

Referring to fig. 1, a basic principle of a projection scheme based on LCoS is shown in the figure, a second polarizer 60 (shown as a Polarization Beam Splitter, PBS) is disposed in front of a micro-display 20 (shown as an LCoS), a light Beam emitted from a light source 100 passes through a light uniformizing system 600 and then is uniformly incident on a projection lens 30 (shown as a PBS), unpolarized light enters the PBS, s-polarized light is reflected to the LCoS, and p-polarized light exits through the PBS. When the pixel points on the LCoS are in a bright state, the s-polarized light is changed into p-polarized light after being reflected by the liquid crystal layer and the reflecting mirror of the LCoS. After being reflected along the original light path, the light rays enter the lens through the PBS prism. For the pixel point in the dark state, the liquid crystal does not modulate the incident s-polarized light, so the s light reflected by the display chip is still reflected by the PBS and cannot enter the lens. The thickness and width of the PBS in this arrangement are the same, which results in a lighting system that is relatively large in size and weight, which is detrimental to the miniaturization and weight reduction of the AR device and affects the comfort of wearing the AR device.

Referring to fig. 2, the principle of the front lighting scheme based on Surface Relief Grating (SRG) is shown in the figure, and the projection display with the DMD device as the core is also called the projection display technology (DLP). A DMD chip can be used to construct a variety of projection display systems. Since the DMD chip works in the pulse counting mode, the DMD chip is not only digital in picture composition, namely, on a pixel, but also digital in image gray scale, and therefore, the DMD chip is a completely digital spatial light modulator, and digital image projection display can be realized. The DLP projection system usually employs a square rod illumination system, the incident end of the square rod is located at a focus of the ellipsoidal lamp, light emitted from the light source 100 enters the light-coupling grating 300 and is reflected multiple times in the light guide 400 to form uniform rectangular distribution on the light-coupling grating 700, and then the illumination lens group passes through the display 20 and the second polarizer 60 to make the light emitted from the light-coupling grating 700 appear on the projection lens 30, so as to form a suitable illumination area. The DLP projection system can be mainly divided into a telecentric structure and a non-telecentric structure, the brightness uniformity of the telecentric structure system is good, but the adopted eccentric design can cause the caliber of a projection objective to be increased, so that the volume of the whole system is increased; the non-telecentric structure is simple, optical elements are few, but the aperture of the front group lens of the projection objective is large, the eccentricity is fixed, and the adjustment cannot be carried out. Although the volume of the micro-display which does not emit light actively is small, the optical system for providing illumination for the display is generally large, and the wearing comfort of the AR device is seriously affected by the traditional illumination system due to the high requirements of the AR device on the volume and the weight.

The inventor has found that if a light and thin waveguide is used to replace a heavy dodging device and a PBS, the weight and volume of the whole illumination light path can be greatly reduced, but the coupling-in efficiency of the illumination light path is low when the grating is used for coupling.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a conventional augmented reality device. The light beam emitted from the light source 100 is incident on the incoupling grating 300 via the collecting lens 800 and the first polarizer 200, and part of the transmitted order propagates towards the incoupling grating. The following energy losses occur during the propagation of the beam:

1. when the light beam is polarized by the first polarizer 200, the p-light is absorbed or reflected by the first polarizer 200.

2. When a light beam is incident on the incoupling grating 300, its reflection level 0 is reflected by the incoupling grating 300 into the air.

3. Light propagating in the waveguide (which may include light propagating out of the grating toward the incoupling grating 300, light reflected back by the waveguide plane in transmission orders, etc.) bounces into the incoupling grating 300, with its transmission order exiting out of the incoupling grating 300 into the air due to the symmetry of the diffraction orders.

Therefore, the application provides an augmented reality device and AR glasses, can effectively reduce the volume of the augmented reality device, and can collect the light beam reflected by the coupling grating and the p light reflected or absorbed by the first polaroid to the coupling grating again in the existing grating coupling scheme, so that the coupling efficiency is improved, and the augmented reality device has the advantages of being light, thin and good in mass production.

Referring to fig. 4, an augmented reality apparatus 10 provided in the present application may include: a light source 100, a first polarizer 200, a light guide 400, an imaging module (not shown), and a reflector 500 having a reflective surface 510.

The light source 100 is used to emit light. The light source 100 is preferably an LED light source, although other light sources may be selected. The light source 100 is not limited in color, and may be a single-color light source or a mixed light source, and may be selected according to the requirement, for example, the light source may be a micro led light source.

The first polarizer 200 is located at a side of the light source 100 close to the light guide 400. The first polarizer 200 is used for polarizing incident light, and the first polarizer 200 may be a reflective polarizer or an absorptive first polarizer, and the absorptive first polarizer absorbs 50% of light and cannot be recycled, so that the efficiency is low, and thus the reflective polarizer is preferred in this application, such as a Dual Brightness Enhancement Film (DBEF) device.

An incoupling grating 300 and an outcoupling grating (not shown) are disposed on the optical waveguide 400, and the incoupling grating 300 is located on the side of the first polarizer 200 away from the light source 100. The incoupling grating 300 may be of the same material as the optical waveguide, for example, the incoupling grating 300 may be obtained by: slits parallel to each other, equidistant and equal in width are etched in a set area on the optical waveguide 400, so that the etched set area is the incoupling grating 300. The light in the optical waveguide 400 is emitted from the outcoupling grating, and the outcoupling grating is used for coupling the light in the optical waveguide 400 out to human eyes for imaging.

The incoupling grating 300 is used to couple light through a medium into the optical waveguide 400, it being understood that the incoupling grating 300 may be a binary grating, a blazed grating, or a multi-step grating. The incoupling grating 300 diffracts light incident from the light source, and may diffract multiple orders of diffracted light, such as zero order diffracted light, first order diffracted light, second order diffracted light, third order diffracted light, and so on. However, the intensity of the zero-order diffracted light is strong, but the propagation angle of the zero-order diffracted light is not changed, and the zero-order diffracted light cannot propagate through the optical waveguide. The intensity of the first-order diffracted light is larger than the intensity of the second-order diffracted light, the third-order diffracted light and the like, and the brightness of light imaged on human eyes is improved.

The reflector 500 may be arranged on the side of the light source 100 remote from the light guide 400 or may be arranged between the light source 100 and the incoupling grating 300. The shape of the reflecting surface 510 of the reflector 500 may be the same as the shape of the reflector 500 itself, for example, when the reflector 500 is bowl-shaped, the inner surface thereof may be used as the reflecting surface 510 (as shown in fig. 4). The reflecting surface 510 may be formed by a concave surface of the reflector 500, for example, the reflector 500 may be a flat plate, a downward concave may be formed on a side of the reflector 500 facing the optical waveguide 400, and a surface of the concave may be the reflecting surface 510. In order to couple more light into the incoupling grating 300, the reflecting surface 510 of the reflector 300 may be configured to be located between the light source 100 and the incoupling grating 300 for reflecting the outgoing light emitted from the light source 100 to the incoupling grating 300. It is understood that the reflector 500 can reflect the light emitted from the light source 100 to be transmitted in a desired direction, so that the reflector 500 can effectively utilize the light energy. The reflective surface 510 of the reflector 500 is disposed between the light source 100 and the incoupling grating 300, and can reflect light emitted from the light source 100, light emitted from the incoupling grating 300, and light reflected by the first polarizer 200 back to the incoupling grating 300. That is, all or part of the emergent light of the light source 100 is reflected by the reflecting surface 510, passes through the first polarizer 200 and the incoupling grating 300 in sequence, and enters the light guide 400.

To improve the coupling-in efficiency, the gap between the reflecting surface 510 of the reflector 500 and the coupling-in grating 300 and the light source 100 should be as small as possible. In other alternative embodiments, the light source 100 may be disposed in the reflective surface 510, and the light source 100 may also be a reflective light source, and light emitted from the reflective light source is reflected by the reflective surface 510 and then enters the first polarizer 200.

It should be noted that the medium between the optical waveguide 400 and the light source 100 may be filled with various transparent media such as plastic, glass, air, etc., and for simplicity of description, the filled medium is referred to as air in the following. It will be appreciated that any one or combination of these materials may have a refractive index greater than the refractive index of the incoupling grating 300 to improve the coupling efficiency of the incoupling grating 300.

In the augmented reality device 10 provided by the present application, the reflector 500 having the reflecting surface 510 is disposed between the light source 100 and the incoupling grating 300, so that the light beam reflected by the incoupling grating 300 in the air direction and the p light reflected or absorbed by the first polarizer 200 are collected to the incoupling grating 300 again, thereby improving the incoupling efficiency.

In some embodiments, the imaging module may be configured as shown in fig. 2, i.e., the imaging module may include: display 20, second polaroid 60 and projection lens 30, display 10 sets up the light guide 300 is close to one side of coupling grating 700, second polaroid 60 sets up the light guide 300 is kept away from one side of coupling grating 700, projection lens 30 sets up second polaroid 60 is kept away from one side of light guide 300, the light warp of light source 100 outgoing pass through in proper order after coupling grating 700 jets out display 20, second polaroid 60 and projection lens 30. In the present embodiment, the display 20 is LCoS.

Referring to fig. 5, the following describes the collection capability of the reflecting surface 510 of the reflector 500 in the present embodiment for three types of light rays. The following types of light exist in the light path:

1. unpolarized light emitted from the LED light source 100;

2. p-polarized light reflected back by the first polarizer 200;

3. s-polarized light reflected back to air by the incoupling grating 300 and s-polarized light exiting through the incoupling grating 300 in the light guide 400.

To improve the coupling efficiency, all three types of light can be collected and converged by the reflecting surface 510 of the reflector 500, and the collection paths of the three types of light are as follows:

assuming that the light emitted from the light source 100 is unpolarized light with an original angle of 120 °, the reflecting surface 510 of the reflector 500 guides the large-angle light emitted from the light source 100 to the first polarizer 200 through one or more reflections, as shown in fig. 5 (a), where s-polarized light is incident to the incoupling grating 300 through the first polarizer 200, generating diffraction orders that are transmitted into the light waveguide 400 and diffraction orders that are reflected back to the air, and p-polarized light is reflected by the first polarizer 200.

The propagation path of the p-polarized light reflected back by the first polarizer 200 is shown in fig. 5 (b): the reflected p light is reflected back to the light source 100 by the reflecting surface 510 of the reflector 500, and unpolarized light is excited again on the phosphor of the light source 100 and propagates along the path as shown in fig. 5 (c), and finally a part of s light is coupled into the optical waveguide 400.

The light traveling path of the light traveling toward the air from the light guide 400 (when the light traveling in the light guide 400 bounces into the incoupling grating 300, the transmission order is generated from the light guide 400 into the air due to the symmetry of the diffraction order) and the light reflected from the incoupling grating 300 are shown in (c) of fig. 5: the light exiting from the incoupling grating 300 toward the air direction enters the incoupling grating 300 through 1 or more reflections at the reflecting surface 510 of the reflector 500, part of the light is coupled into the light waveguide 400 through the grating, and the rest of the light is reflected back to the emitting surface, and the above steps are repeated.

In summary, the light emitted from the light source 100 repeatedly bounces off the incoupling grating 300, the reflecting surface 510 of the reflector 500 and the light source 100 until the light is transmitted from the incoupling grating 300 into the light waveguide 400. The light loss is mainly divided into the following two parts:

1. absorbed by the reflective surface 510 of the reflector 500 or the first polarizer 200;

2. and exits the reflecting surface 510 of the reflector 500 and the light source 100 into the aperture of the grating 300.

Therefore, to reduce energy loss and improve coupling efficiency, the reflective surface 510 of the reflector 500 may be selected to have a smooth surface and a high reflectivity, and to minimize gaps between the coupling-in grating, the reflector and the light source, for example, the reflective surface 510 may be a metal surface, and the specific material may include, but is not limited to, copper alloy or copper-based composite material.

In one embodiment, as shown in fig. 6, the cross-sectional shape of the reflecting surface 510 of the reflector 500 along a direction perpendicular to the optical waveguide is rectangular. In another embodiment, as shown in fig. 7, the cross-sectional shape of the reflecting surface 510 of the reflector 500 along a direction perpendicular to the optical waveguide is a trapezoid. In the two embodiments, the cross section of the reflecting surface 510 of the reflector 500 along the direction perpendicular to the optical waveguide is a straight line, and the reflector 500 in the two embodiments may include, but is not limited to, a square rod, a conical rod, and other light guiding devices.

In another embodiment, as shown in fig. 8, the cross-sectional shape of the reflecting surface 510 of the reflector 500 along the direction perpendicular to the optical waveguide is an arc, and in this embodiment, the reflector 500 may include, but is not limited to, various symmetric or asymmetric curved-surface-type light-reflecting bowls, light-reflecting cups, and the like. Since the smaller the angle range of the light propagating in the optical waveguide is, the more advantageous the illumination is, the light source 100 may be a structure in which the emergent light beam is collimated into a small-angle light beam, such as a free-form surface reflector lamp cup with a collimating function.

In order to enable a larger range of light outcoupling, so that the human eye can still see an image when moving within a larger range, the light coupled into the optical waveguide by the optical grating can be expanded. At this time, the basic principles to be satisfied are: the outcoupled light and the incoupled light need to be parallel to each other. Thus, when the expanded light is coupled out to the human eyes for imaging, the image is not distorted. In an alternative embodiment, in the augmented reality device, the coupling-in grating is aligned in the optical path of the coupling-out grating, which expands the light transmitted in the optical waveguide and couples it out for imaging the human eye. It will also be appreciated that it is desirable to set the period of the incoupling and outcoupling gratings to be the same, and the orientation of the transmissive incoupling and outcoupling gratings to be identical. For example, the period of the in-grating and the period of the out-grating are set to 392nm, and the tilt directions of the structures of the projections of the in-grating and the out-grating are the same.

Since it is difficult for a single reflective surface to collimate the light emitted from the light source 100 to a very small range, the collecting lens 800 can be combined with the reflector 500 to achieve both the small-angle light emission and the energy collection based on the above embodiments. Referring to fig. 9, in an embodiment, a collecting lens 800 may be disposed in the reflector 500, and the collecting lens 800 may be one or more geometric optical lenses, micro lens arrays, super lenses, or any optical devices with optical converging and diverging capabilities, or any combination of one or more of the above. The collecting lens 800 and the reflector 500 cooperate to collimate the emitted light to be incident on the incoupling grating 300, and the light emitted from the incoupling grating 300 and the first polarizer 200 toward the reflecting surface 510 of the reflector 500 is collected by the reflecting surface 510 of the reflector 500 and re-incident on the incoupling grating 300. In the present embodiment, the reflector 500 abuts against the incoupling grating 300, and the structure of the reflector 500 and the collecting lens 800 can improve the light absorption of the augmented reality device.

In another embodiment, as shown in fig. 10, when the reflector 500 cannot abut against the incoupling grating 300, a dummy lens or a lens set may be disposed between the reflector 500 and the incoupling grating 300, in this embodiment, taking the first collecting lens 810 and the second collecting lens 820 as an example, the first collecting lens 810 and the second collecting lens 820 in this embodiment have the same collimating effect on the light as the collecting lens 800 in fig. 9, except that the first collecting lens 810 and the second collecting lens 820 in this embodiment may converge the light emitted from the incoupling grating 300 into the reflecting surface 510 of the reflector 500, so that the reflector 500 and the incoupling grating 300 still have high collecting efficiency when a certain distance exists between them. It should be noted that the distance between the coupling grating 300 and the reflecting surface 510 of the reflector 500 is not a necessary term for placing the collecting lens 800, but is an optimal term for increasing the collecting efficiency.

In another embodiment, as shown in fig. 11, the collecting lens 800 may use a TIR lens, the TIR lens has the same collimation effect on the light emitted from the light source 100 as the collecting lens 800 in fig. 9 and 10, the total internal reflection surface 510 of the TIR lens may be used as the reflector 500 proposed in this application, and the total internal reflection surface 510 may be coated with a reflective film to improve the collection efficiency of the light rays that do not satisfy the total reflection condition. It is understood that in the embodiment of fig. 9, a fixing member for fixing the collecting lens 800 needs to be provided in the reflector 500, in the embodiment of fig. 10, a fixing member for fixing the first collecting lens 810 needs to be provided in the reflector 500, and a fixing member for fixing the second collecting lens 820 needs to be provided in the augmented reality device 10. This embodiment does not require a structure for fixing the collecting lens 800 to be placed in the reflector 500, and the structure is simpler. The optical waveguide 400 helps to avoid waste caused by refraction of light during transmission by totally reflecting the light coupled into the optical waveguide 400, thereby improving the utilization rate of the light transmitted in the optical waveguide 400.

Referring to fig. 12, the present application further provides AR glasses, and the AR glasses provided in the embodiment of the present application may include: a frame 40, a temple 50, and the augmented reality device 10 as described above, wherein the frame 40 is connected to the temple 50, and the augmented reality device 10 is provided in the frame 40.

In the augmented reality device 1 provided by the present application, the reflector 500 having the reflecting surface 510 is disposed between the light source 100 and the incoupling grating 300, so that the light beam emitted from the incoupling grating 300 in the air direction and the p light reflected or absorbed by the first polarizer 200 are collected to the incoupling grating 300 again, thereby improving the incoupling efficiency.

The description of the terms "some embodiments," "other embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiments or examples is included in at least one embodiment or example of the application. In this application, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the various embodiments or examples and features of the various embodiments or examples described in this application can be combined and combined by those skilled in the art without conflicting.

The above embodiments are only for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (10)

1. An augmented reality apparatus, comprising:

a light source for emitting light;

a first polarizing plate located at one side of the light source;

the optical waveguide is provided with an incoupling grating and an outcoupling grating, and the incoupling grating is positioned on one side of the first polaroid, which is far away from the light source;

the imaging module is positioned on one side of the coupling grating of the optical waveguide; and

a reflector having a reflective surface located between the light source and the incoupling grating;

all or part of emergent light of the light source is reflected by the reflecting surface, then sequentially passes through the first polaroid and the coupling-in grating, enters the optical waveguide, and then enters the imaging module through the coupling-out grating.

2. The augmented reality device of claim 1, wherein the imaging module comprises: display, second polaroid and projection lens, the display sets up the optical waveguide is close to one side of coupling-out grating, the second polaroid sets up the optical waveguide is kept away from one side of coupling-out grating, projection lens sets up the second polaroid is kept away from one side of optical waveguide, the light warp of light source outgoing passes through in proper order after coupling-out grating jets out display, second polaroid and projection lens.

3. The augmented reality apparatus of claim 1, wherein the reflective surface comprises a first opening and a second opening; the light source is located at the first opening, and the coupled grating is located at the second opening.

4. The augmented reality apparatus of claim 1, wherein the reflective surface is a flat surface or a curved surface.

5. The augmented reality apparatus of claim 1, further comprising: a collection lens positioned between the light source and the first polarizer or between the first polarizer and the incoupling grating.

6. The augmented reality device of claim 1, wherein the reflector is a total internal reflection lens, a reflective film of the total internal reflection lens forming a reflective surface of the reflector.

7. The augmented reality device of claim 1, wherein the light source is a MicroLED light source.

8. The augmented reality apparatus of claim 5, wherein the collection lens comprises a first collection lens and a second collection lens, the first collection lens being positioned between the first polarizer and the incoupling grating, the second collection lens being positioned between the first polarizer and the light source.

9. The augmented reality apparatus of claim 1, wherein the first polarizer is a reflective polarizer.

10. AR glasses, comprising: a frame, a temple and an augmented reality device according to any one of claims 1 to 9, the frame being connected to the temple, the augmented reality device being disposed within the frame.

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