CN117452648A - AR glasses - Google Patents

Abstract

The embodiment of the invention provides AR (augmented reality) glasses, and relates to the field of augmented reality. The AR glasses comprise a light machine, a lens component and an optical rotating component, wherein the optical rotating component can rapidly turn the light path of light rays emitted by the light machine, and when the light paths are different, images with parallax are conveyed to a first entrance pupil grating or a second entrance pupil grating. Based on this, on the one hand, the AR glasses that this application provided have reduced the equipment complexity, have eliminated the demand of image calibration in the two ray apparatus modules, improve production efficiency and speed, have extensive production application prospect. On the other hand, the AR glasses avoid the problem of brightness loss of the single-ray machine glasses based on the polarized light principle, ensure the brightness of images and improve the user experience.

Description

AR glasses

Technical Field

The invention relates to the technical field of augmented reality, in particular to AR (augmented reality) glasses.

Background

Augmented Reality (AR) is a technology that superimposes virtual information into the real world, fusing virtual content with the real scene through a display device. However, the general AR technology can only output 2D virtual images superimposed into the real environment, and the real world is three-dimensional, which results in the virtual images as if a sheet of paper were floating in the real world. This is not suitable for some scenes where a deep degree of fusion of reality and virtual is required. Furthermore, it is apparent that 2D images do not meet the needs of this population for some highly immersive users. Accordingly, related manufacturers have developed 3D-AR glasses to project virtual image information in 3D to the front of the eyes of people with the real world superimposed to provide a more realistic experience.

The existing AR glasses generally have two types, one is a double-light type, and the image projected by each optical machine of the double-light type AR glasses corresponds to one eye, so that the two optical machines can output images with parallax at the same time, and then the images arrive at the left eye and the right eye respectively to complete the 3D image construction. This type of limitation is complicated steps at the time of assembly, and binocular coupling is required because calibration of the resulting image is required, which is disadvantageous in mass production because of high time consumption and low yield.

The second type is a single-light machine type, and a single-light machine binocular display module is adopted. The AR glasses of the type can realize binocular display by utilizing the symmetry of grating diffraction only by one optical machine, solve the problem of binocular coupling of a double optical machine scheme, and greatly improve the mass production efficiency. But binocular images are provided by one optical bench, and 3D effect cannot be achieved by conventional means. For this situation, two schemes for realizing 3D effect have been proposed, one is to cooperate with a liquid crystal shutter to realize 3D appearance in time sequence; two polarized images are generated by using a double-sided board, finally, a polarization selection plate is arranged in an exit pupil area, only light in a specific polarization direction is transmitted, and finally, images corresponding to different polarized lights are received by two eyes, and are subjected to brain processing to generate a 3D effect.

Disclosure of Invention

The invention provides the AR glasses, which can reduce assembly complexity, eliminate the requirement of image calibration in a double-optical-machine module, improve production efficiency and speed, have large-scale production application prospect, ensure imaging brightness, avoid the problem of brightness loss of the single-optical-machine glasses based on a polarized light principle, and improve user experience.

Embodiments of the invention may be implemented as follows:

in a first aspect, the present invention provides AR glasses comprising a light engine, a lens assembly, and an optical rotation member;

the lens component is provided with a first entrance pupil grating and a second entrance pupil grating, and the optical rotating component is used for alternately coupling light rays emitted by the optical machine into the first entrance pupil grating and the second entrance pupil grating.

In an alternative embodiment, the AR glasses further include a control unit, where the control unit is connected to the optical machine, and the control unit is configured to control the optical machine to emit or stop emitting light.

In an alternative embodiment, the control unit comprises an optical machine control circuit, when the optical rotating component rotates, the output voltage of the optical machine control circuit is lower than the working threshold voltage of the optical machine, and the optical machine is closed and stops emitting light; when the optical rotating part stops rotating, the output voltage of the optical machine control circuit is higher than the working threshold voltage of the optical machine, and the optical machine is started and emits light.

In an alternative embodiment, the AR glasses further comprise an electric switch diaphragm, and when the optical rotation component rotates, the electric switch diaphragm shields the light emitting surface of the optical machine; when the optical rotating part stops rotating, the electric switch diaphragm exposes the light emergent surface of the optical machine.

In an alternative embodiment, the minimum rotation angle of the optical rotation element is greater than one half of the exit field angle of the light engine.

In an alternative embodiment, the lens assembly is further provided with a first exit pupil grating and a second exit pupil grating;

the AR glasses further include a first wedge-shaped mirror array and a second wedge-shaped mirror array, the first wedge-shaped mirror array and the second wedge-shaped mirror array are both disposed on the lens assembly, and the first wedge-shaped mirror array covers the first exit pupil grating and the second wedge-shaped mirror array covers the second exit pupil grating.

In an alternative embodiment, the AR glasses further comprise a third wedge-shaped mirror array and a fourth wedge-shaped mirror array, the third wedge-shaped mirror array is disposed on a side of the lens assembly away from the first wedge-shaped mirror array and opposite to the first wedge-shaped mirror array, and the fourth wedge-shaped mirror array is disposed on a side of the lens assembly away from the second wedge-shaped mirror array and opposite to the second wedge-shaped mirror array.

In an alternative embodiment, the lens assembly includes a first lens and a second lens connected at an included angle, and the included angle is adjustable.

In an alternative embodiment, the optical rotating component includes a turning prism and a rotating structure, the rotating structure is sleeved on the turning prism, and the rotating structure is used for driving the turning prism to rotate so as to refract the light to the first entrance pupil grating or the second entrance pupil grating.

In an alternative embodiment, the optical rotary component comprises a DMD.

The beneficial effects of the embodiment of the invention include:

the application provides AR glasses, it includes optical engine, lens subassembly and optics rotating part, can turn the light path of the emergent light of single optical engine fast through optics rotating part, and the image that has the parallax is to first entrance pupil grating or second entrance pupil grating when difference. Based on this, on the one hand, the AR glasses that this application provided have reduced the equipment complexity, have eliminated the demand of image calibration in the two ray apparatus modules, improve production efficiency and speed, have extensive production application prospect. On the other hand, the AR glasses avoid the problem of brightness loss of the single-ray machine glasses based on the polarized light principle, ensure the brightness of images and improve the user experience.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of binocular parallax provided by the present invention;

fig. 2 is a schematic view of a first view angle structure of AR glasses according to the present invention;

FIG. 3 is a schematic view showing the rotation angle of an optical rotation member according to the present invention with time;

FIG. 4 is a schematic diagram of an AR glasses with a wedge mirror array according to the present invention;

FIG. 5 is a schematic diagram II of an AR glasses with a wedge mirror array according to the present invention;

FIG. 6 is a schematic view of a first lens and a second lens connected at an included angle according to the present invention;

FIG. 7 is a schematic view of a turning prism and a rotating structure according to the present invention;

FIG. 8 is a schematic diagram of an AR glasses with DMD as an optical rotation component according to the present invention;

FIG. 9 is a schematic diagram of a DMD according to the present invention;

fig. 10 is a schematic diagram of an AR glasses structure with DMD as an optical rotating component according to the present invention.

Icon: 10-AR glasses; 21-reference; 25-human eye; 31-a first reference line; 33-a second baseline; 100-ray machine; 200-a lens assembly; 300-a first lens; 310-a first entrance pupil grating; 330-a first exit pupil grating; 341-a first wedge mirror array; 343-a third wedge mirror array; 500-a second lens; 510-a second entrance pupil grating; 530-a second exit pupil grating; 541-a second wedge mirror array; 543-fourth wedge mirror array; 700-an optical rotating member; 710—turning a prism; 711-first surface; 713-a second surface; 730-rotating structure; 750-DMD.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus it should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

Before describing embodiments of the present application, since the present application relates to the field of augmented reality, more terms are referred to in the embodiments, and these terms are explained herein.

And (3) grating: gratings refer to optical devices that produce diffraction linearity and when light is transmitted through or reflected by it, form a spectrum that is formed using template imprinting or exposure, and types of gratings commonly used in the field of augmented reality include surface relief gratings and volume holographic gratings.

Parallax: since the left and right eyes of a person have a certain distance on the head, the field of view seen by each eye is slightly different. This difference in viewing angle between the two eyes is referred to as "parallax", which enables us to perceive depth and three-dimensional structure.

In detail, referring to fig. 1, fig. 1 is a schematic diagram of binocular parallax, where projection positions of a three-dimensional reference object 21 on left and right eyes of a person are not identical, and a distance between the two projection positions is parallax, providedThe parallax is d, the pupil distance between the left and right eyes 25 is b, the focal length is F, the depth perceived by a person is Z, and the relational formula isBy the above formula, if there is parallax in the image between the left and right eyes, the human brain can perceive the depth information Z of the image, and thus the three-dimensional world.

A diaphragm: a diaphragm refers to an entity in an optical system that acts to limit a light beam, which may be an edge of a lens, a frame, or a specially configured perforated screen to limit the size of the light beam or field of view (imaging range).

Angle of view: in the optical instrument, a lens of the optical instrument is taken as a vertex, and an included angle formed by two edges of the maximum range of the lens, which can be passed through by an object image of a measured object, is called a field angle.

Wedge mirror: wedge mirrors are a common device in the optical field that is capable of deflecting light in the direction of the thicker wedge mirror, the principle of deflection being based on the law of refraction.

AR glasses 10: augmented Reality, namely augmented reality glasses.

LCOS: liquid crystal on silicon, i.e. a reflective liquid crystal projector.

LBS: laser Beam Scanning, i.e. laser scanning projection.

IPD: interpupillary distance, i.e. the interpupillary distance.

DMD750: digital micromirror device, i.e. an array of digital micro mirrors.

3D three-dimensional, i.e., three-dimensional.

Referring to fig. 2, fig. 2 is a schematic view of a first view structure of AR glasses 10 according to the present invention. The AR glasses 10 include a light machine 100, a lens assembly 200, and an optical rotation member 700; the lens assembly 200 is provided with a first entrance pupil grating 310 and a second entrance pupil grating 510, and the optical rotation member 700 is configured to couple light rays exiting the light engine 100 alternately into the first entrance pupil grating 310 and the second entrance pupil grating 510.

It should be noted that, a worker presets a projection module inside the optical engine 100 through software, codes, and the like, so as to ensure that parallax exists in each frame of images continuously output by the optical engine 100. In the unfolded state, each frame of image generated by the optical engine 100 is guided to the left eye or the right eye through the optical rotating component 700 at different times through the first entrance pupil grating 310 or the second entrance pupil grating 510. For example, the optical engine 100 outputs an odd frame to the left eye and an even frame to the right eye, so that images acquired by each eye are slightly different, and a three-dimensional scene with a stereoscopic impression is generated after the images of both eyes are processed by the brain.

It should be noted that, the projection module inside the optical engine 100 may be configured as LCOS or LBS, which is not limited in this embodiment. In addition, it will be appreciated that since this is a time-sharing output of different images to the human eye 25, the refresh rate of the image information carried by the light needs to be greater than 24 hz in order to ensure that the user can see the three-dimensional scene smoothly and clearly, avoiding any delay or incompatibility perceived by the user. In real life, common image refresh rates are 30 hz, 60 hz, 90 hz, and 120 hz. In order to ensure smoothness of the user in use to the greatest extent, the preferable frequency is 120 Hz.

In order to ensure that the images seen by the left and right eyes are synchronized in the perception of the user and that the left and right eyes correspond to the correct image, respectively, the frequency at which the light is emitted or stopped by the light engine 100 must be consistent with the rotation period of the rotating parts of the light engine 100.

In detail, the AR glasses 10 further include a control unit connected to the optical machine 100, and the control unit is used for controlling the optical machine 100 to emit or stop emitting light.

The control unit may be electrically connected to the optical rotating member 700 to obtain a rotation period of the optical rotating member 700, thereby controlling the light machine 100 to emit or stop emitting light. Of course, the operator may choose to preset the rotation period of the optical rotation member 700 in advance, and also preset the rotation period of the control unit in advance.

Since the present invention outputs images with parallax based on time division and binocular, it is not desirable to output images into glasses in unnecessary time periods. And the unnecessary time period refers to a time period when the optical rotary member 700 is rotated from side to side.

Specifically, referring to fig. 3, fig. 3 is a schematic view illustrating a time-varying angle of an optical rotating component 700 provided in the present application. A in the drawing indicates a start position, where the optical rotating member 700 cannot refract light to the first entrance pupil grating 310 and the second entrance pupil grating 510. When the angle of the optical rotation member 700 is shifted from the point a to the point D with time, the optical rotation member 700 stops rotating and holds for a period of time, that is, the period of time during which the optical rotation member 700 refracts the light to the first entrance pupil grating 310 or the second entrance pupil grating 510. Then, the optical rotation member 700 is rotated at point E, and returns to the initial position when point B is reached, after which the optical rotation member 700 is rotated toward the other entrance pupil grating direction.

It should be emphasized that when the optical rotation member 700 is located between the point a and the point D (or any diagonal line in the drawing), the light engine 100 stops emitting light; when the optical rotation element 700 is at the point D to the point E (or any horizontal line in the drawing), the optical engine 100 emits light. In addition, as can be seen from fig. 3, one rotation period of the optical rotation member 700 is from point a to point C, and correspondingly, one light emitting period of the light engine 100 is from point D to point E.

Taking the refresh rate of the image information as an example of 60 hertz, the rotation period is 1/60s, so that two images can be output in one period. Then, according to the ratio of the light emission and the light blocking in the actual application, the rotation rate of the optical rotation component 700 and the frequency of the light emitted from the optical engine 100 or the frequency of the light emitted from the optical engine are calculated.

As an alternative embodiment, the control unit includes an optical machine control circuit, and when the optical rotation member 700 rotates, the output voltage of the optical machine control circuit is lower than the operation threshold voltage of the optical machine 100, the optical machine 100 is turned off and the outgoing light is stopped; when the optical rotation member 700 stops rotating, the output voltage of the optical engine control circuit is higher than the operation threshold voltage of the optical engine 100, and the optical engine 100 is turned on and emits light. Based on this, it is ensured that the light machine 100 does not emit light during the rotation of the optical rotation member 700, thereby avoiding the formation of stray light to interfere with imaging.

To further avoid stray light interfering with imaging, the AR glasses 10 further include an electric switch diaphragm that shields the light exit surface of the optical bench 100 when the optical rotation member 700 rotates; when the optical rotation member 700 stops rotating, the electric switch diaphragm exposes the light exit surface of the optical engine 100.

The electric switch diaphragm and the optical control circuit may be provided at the same time, or may be provided at any one of them. When the electric switch diaphragm and the optical control circuit are arranged at the same time, even if the optical machine control circuit fails in the use process, the imaging effect can be ensured by the arrangement of the electric switch diaphragm.

As an alternative embodiment, the minimum rotation angle of the optical rotation element 700 is greater than one half the exit field angle of the light engine 100. It should be noted that, when the first entrance pupil area and the second entrance pupil area are just attached, the light emitted by the optical engine 100 disposed above the attachment position of the first entrance pupil area and the second entrance pupil area just covers the two entrance pupil areas in the initial state of the optical engine 100 (i.e., the light emitting surface of the optical engine 100 is just opposite to the attachment position). At this time, the light engine 100 needs to rotate at a minimum angle, i.e. half the angle of the emitted light. Based on the above arrangement, the degradation of three-dimensional display quality caused by the entrance of marginal light into another object when outputting an image of one object can be avoided.

To change the image combining distance and improve the user experience, referring to fig. 4 and 5, in some embodiments, the lens assembly 200 is further provided with a first exit pupil grating 330 and a second exit pupil grating 530; the AR glasses 10 further include a first wedge-shaped mirror array 341 and a second wedge-shaped mirror array 541, the first wedge-shaped mirror array 341 and the second wedge-shaped mirror array 541 are disposed on the lens assembly 200, and the first wedge-shaped mirror array 341 covers the first exit pupil grating 330 and the second wedge-shaped mirror array 541 covers the second exit pupil grating 530.

In detail, the refresh rate of the image information is set to 120 hz, while the odd-numbered frame image with left eye parallax and the even-numbered frame image with right eye parallax are set, and the light-emitting view angle of the optical machine 100 is 40 °. The optical pickup 100 is disposed directly above the first and second entrance pupil gratings 310 and 510, and the optical rotation member 700 is disposed between the optical pickup 100 and the joint.

The optical rotating component 700 rotates 20 ° towards the first entrance pupil grating 310, and adjusts the output voltage of the optical engine control circuit to be higher than the working threshold voltage of the optical engine 100, and starts the optical engine 100, so that the light ray carrying the odd frame image emitted by the optical engine 100 is coupled into the first entrance pupil grating 310, enters the first lens 300 to perform total reflection propagation, and is coupled out of the waveguide from the first exit pupil grating 330 when the light ray propagates a certain distance to reach the first exit pupil grating 330.

The final light passes through the first wedge-shaped mirror array 341 and deflects towards the direction of larger thickness of the wedge-shaped mirrors, and finally is coupled into the human eye 25 to complete the output of the left eye parallax image. It should be noted that, the thickness of the wedge-shaped mirrors in the first wedge-shaped mirror array 341 and the second wedge-shaped mirror array 541 is greater on the side near the center of the lens assembly 200 than on the side far from the center of the lens assembly 200. Referring again to fig. 5, the dashed line represents the original optical path, the solid line represents the optical path after passing through the second wedge mirror array 541, and the intersection point of the extension lines of the solid line is farther than the intersection point of the extension lines of the dashed line, thereby changing the distance of the image seen by the human eye 25.

During this process, the optical rotation member 700 is kept stationary to ensure the light path is stable at the time of image output. Then, after the image output of the left eye parallax is completed, the output voltage of the optical engine control circuit is reduced below the working threshold voltage of the optical engine 100, and the optical engine 100 is turned off. At this time, the optical rotation member 700 rotates 40 ° toward the end of the first lens 300 away from the connection point, and the voltage-activated light machine 100 is adjusted, and similarly, the light rays emitted from the light source carrying the even frame image are coupled into the second entrance pupil grating 510 through the deflection effect of the optical rotation member 700, and sequentially pass through the second lens 500, the second exit pupil grating 530 and the second wedge-shaped lens array 541 to reach the right eye, thereby completing the output of the right eye parallax image.

And the odd frame image and the even frame image are processed by brain to form a three-dimensional scene with depth information. The process is repeated and rapidly circulated, so that a user can see a smooth and clear three-dimensional scene.

It can be understood thatIf the deflection angle of the selected wedge-shaped mirror to the light is 17 °, the included angle between the illustrated light passing through the wedge-shaped mirror array and the pupil center of the human eye 25 is 3 °. Specifically, if the inter-pupillary distance of the user is 6.5cm, the distance between the pupils of the user is calculated according to the image-combining distance formulaAbout 125cm, i.e. about 1.25m from the human eye 25.

That is, by using the first wedge-shaped mirror array 341 and the second wedge-shaped mirror array 541, the image combining distance is changed, so that the image seen by the human eye 25 is farther away from the human eye 25, and the eye provided by the application can adapt to the habit of the human eye 25 for observing objects more, and the user experience is improved.

Further, in view of the fusion of the virtual image and the real environment, the AR glasses 10 further include a third wedge-shaped mirror array 343 and a fourth wedge-shaped mirror array 543, wherein the third wedge-shaped mirror array 343 is disposed on a side of the lens assembly 200 away from the first wedge-shaped mirror array 341 and is opposite to the first wedge-shaped mirror array 341, and the fourth wedge-shaped mirror array 543 is disposed on a side of the lens assembly 200 away from the second wedge-shaped mirror array 541 and is opposite to the second wedge-shaped mirror array 541.

It should be noted that, the thickness of the wedge-shaped mirrors in the third wedge-shaped mirror array 343 and the fourth wedge-shaped mirror array 543 is smaller on the side near the center of the lens assembly 200 than on the side far from the center of the lens assembly 200. Based on this, the third wedge mirror array 343 and the fourth wedge mirror array 543 perform the same processing of the light of the external environment as the virtual image, so that the virtual image and the real world image can be fused together better. Preferably, the first wedge-shaped mirror array 341, the second wedge-shaped mirror array 541, the third wedge-shaped mirror array 343 and the fourth wedge-shaped mirror array 543 are made of the same material, and the refractive indexes are equal.

In some embodiments, referring to fig. 6, the lens assembly 200 includes a first lens 300 and a second lens 500 connected at an angle, and the angle is adjustable. Based on this, it is stated that the first lens 300 and the second lens 500 can adjust a certain angle, so that the two lenses are no longer parallel, thereby ensuring that the image combining distance of the AR glasses 10 provided in the present application can be still adjusted according to the user's requirements after the reassembly is completed. Preferably, the first lens 300 and the second lens 500 are symmetrically disposed.

It should be noted that, in the embodiment of adjusting the included angle between the first lens 300 and the second lens 500, the AR glasses 10 uses reflective diffraction to image the left and right eyes, i.e. the optical engine 100 and the human eye 25 (or the incident light and the emergent light) are disposed on the same side of the lenses. The first reference line 31 is a parallel line parallel to the mirror surfaces of the first lens 300 and the second lens 500 arranged in parallel, and the second reference line 33 is a direction perpendicular to the first reference line 31.

Setting the half of the light-emitting field angle of the light machine 100 as β, the acute angle formed by the first lens 300 or the second lens 500 and the first reference line 31 as γ, the included angle between the outgoing light coupled out of the first lens 300 or the second lens 500 and the second reference line 33 as a, and according to the symmetry characteristics of the outgoing light and the incoming light about the grating normal, it can be deduced that the included angle a and twice γ are inversely related, that is, a=β -2 γ. Meanwhile, s is set as the imaging distance, and s= (IPD/2)/tan (β -2γ) is derived from the imaging distance formula of s= (IPD/2)/tan (a). Therefore, when the user uses the image sensor, γ can be freely changed according to the change, and thus a desired image combining distance can be obtained.

Specifically, taking the example in which the optical machine 100 outputs a right eye parallax image, β is set to 19 °, γ is set to 9 °, and a is calculated to be 1 ° according to the above formula. Assuming that the interpupillary distance IPD of the wearer is 6cm, the distance of the combined imageAbout 172cm, i.e. about 1.72m from the human eye 25. In addition, since the first lens 300 and the second lens 500 are symmetrically disposed, the optical engine 100 outputs the left eye parallax image as described above. When the lens is specifically used, a user can adjust the rotation angle between the first lens 300 and the second lens 500 according to the use requirement, so as to realize any desired image combining distance.

Referring to fig. 7, in some embodiments, the optical rotating component 700 includes a turning prism 710 and a rotating structure 730, the rotating structure 730 is sleeved on the turning prism 710, and the rotating structure 730 is used for driving the turning prism 710 to rotate so as to refract light to the first entrance pupil grating 310 or the second entrance pupil grating 510.

Specifically, the turning prism 710 may be configured as a triangle structure, which includes a first surface 711 and a second surface 713, the first surface 711 is sleeved with the rotating structure 730, and the first surface 711 is opposite to the light exit surface of the optical machine 100, and light enters the turning prism 710 from the first surface 711 and exits to the first entrance pupil grating 310 or the second entrance pupil grating 510 from the second surface 713. When the turning structure 730 drives the turning prism 710 to rotate, the first surface 711 is still opposite to the light-emitting surface of the optical engine 100, and the second surface 713 emits light to the first entrance pupil grating 310 or the second entrance pupil grating 510 according to the rotated state.

Referring to fig. 8-10, in some embodiments, optical rotary component 700 includes DMD750. It will be appreciated that DMD750 is characterized by only two rotational states, + X deg. and-X deg.. In addition, since the DMD750 itself can rotate, an additional rotating structure 730 is not required, so that the overall mechanical design difficulty can be reduced to a certain extent, and only the rotating frequency of the DMD750 needs to be determined when the DMD is used. For example, in the present embodiment, the optical engine 100 having an exit angle of view of 34 ° is used, and the two states adopted by the DMD750 are set to +17° and-17 °.

When the optical engine 100 is disposed at the connection between the first lens 300 and the second lens 500, the DMD750 is disposed between the first lens 300 and the second lens 500, and the refresh rate of the image output by the optical engine 100 is set to be 120 hz; setting an odd frame image to be output to a left eye and an even frame to be output to a right eye; the light-emitting field angle of the output image was 34 °. Based on this, each time the DMD750 outputs one frame image, it rotates 34 ° toward the first entrance pupil grating 310 or the second entrance pupil grating 510 with the extension line from the optical machine 100 passing through the junction.

In summary, the present application proposes an AR glasses 10, which includes a light engine 100, a lens assembly 200 and an optical rotating component 700, and can quickly turn an optical path of light emitted by the light engine 100 through the optical rotating component 700, and when the light path is bad, an image with parallax is transmitted to a first entrance pupil grating 310 or a second entrance pupil grating 510. Based on this, on the one hand, the AR glasses 10 provided in the present application reduces the assembly complexity, eliminates the need for image calibration in the dual-ray machine 100 model, improves the production efficiency and the rate, and has a large-scale production application prospect. On the other hand, the AR glasses 10 avoid the problem of loss of brightness of the single-optical machine 100 glasses based on the polarized light principle, ensure the brightness of images and improve the user experience.

The present invention is not limited to the above embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims (10)

1. An AR glasses, characterized by comprising a light machine (100), a lens assembly (200) and an optical rotation member (700);

the lens assembly (200) is provided with a first entrance pupil grating (310) and a second entrance pupil grating (510), and the optical rotation component (700) is used for alternately coupling light rays emitted by the optical bench (100) into the first entrance pupil grating (310) and the second entrance pupil grating (510).

2. The AR glasses according to claim 1, wherein the AR glasses (10) further comprise a control unit, the control unit being connected to the light engine (100), the control unit being configured to control the light engine (100) to emit or stop emitting the light.

3. The AR glasses according to claim 2, wherein the control unit comprises an optomechanical control circuit, the output voltage of which is lower than the operating threshold voltage of the optomechanical (100) when the optical rotation means (700) rotates, the optomechanical (100) being turned off and stopping the light; when the optical rotation component (700) stops rotating, the output voltage of the optical machine control circuit is higher than the working threshold voltage of the optical machine (100), and the optical machine (100) is started and emits the light.

4. An AR glasses according to any one of claims 1-3, wherein the AR glasses (10) further comprise an electro-switching diaphragm, which obstructs the light exit surface of the optical bench (100) when the optical rotation member (700) is rotated; when the optical rotating component (700) stops rotating, the electric switch diaphragm exposes the light emergent surface of the optical machine (100).

5. The AR glasses according to claim 1, wherein the minimum rotation angle of the optical rotation member (700) is greater than one half of the angle of field of the light emitted by the light machine (100).

6. The AR glasses according to claim 1, wherein the lens assembly (200) is further provided with a first exit pupil grating (330) and a second exit pupil grating (530);

the AR glasses (10) further comprise a first wedge-shaped mirror array (341) and a second wedge-shaped mirror array (541), the first wedge-shaped mirror array (341) and the second wedge-shaped mirror array (541) are both arranged on the lens assembly (200), the first wedge-shaped mirror array (341) covers the first exit pupil grating (330), and the second wedge-shaped mirror array (541) covers the second exit pupil grating (530).

7. The AR glasses according to claim 6, wherein the AR glasses (10) further comprise a third wedge-shaped mirror array (343) and a fourth wedge-shaped mirror array (543), the third wedge-shaped mirror array (343) being disposed on a side of the lens assembly (200) remote from the first wedge-shaped mirror array (341) and being disposed with respect to the first wedge-shaped mirror array (341), the fourth wedge-shaped mirror array (543) being disposed on a side of the lens assembly (200) remote from the second wedge-shaped mirror array (541) and being disposed with respect to the second wedge-shaped mirror array (541).

8. The AR glasses according to claim 1, wherein the lens assembly (200) comprises a first lens (300) and a second lens (500) connected at an included angle, and the included angle is adjustable.

9. The AR glasses according to claim 1, wherein the optical rotation component (700) comprises a turning prism (710) and a rotation structure (730), the rotation structure (730) is sleeved on the turning prism (710), and the rotation structure (730) is used for driving the turning prism (710) to rotate so that the light is incident on the first entrance pupil grating (310) or the second entrance pupil grating (510).

10. The AR glasses according to claim 1, wherein the optical rotation element (700) comprises a DMD (750).