CN111487781A - Optical display device, intelligent glasses and imaging method suitable for eyes - Google Patents

Abstract

The embodiment of the application provides an optical display device, intelligent glasses and an imaging method suitable for eyes, wherein the optical display device comprises a reflector, a reflecting layer and an MEMS laser projector, the reflector comprises an elliptic reflecting curved surface, and the elliptic reflecting curved surface is provided with a first focus and a second focus; the reflectivity of the reflecting layer is 50% -98%, and the reflecting layer is arranged in a manner of being attached to the elliptic reflecting curved surface; the MEMS laser projector is used for emitting a projection light beam from the first focus, and the projection light beam is reflected by the elliptic reflecting curved surface and then enters the second focus and enters eyes. The optical display device that this application embodiment provided produces the projection light beam through MEMS laser projector, can effectively solve the screen window effect in the current intelligent glasses, and optical display device simple structure has effectively simplified the formation of image light path, conveniently processes manufacturing.

Description

Optical display device, intelligent glasses and imaging method suitable for eyes

Technical Field

The application relates to the technical field of optical display, in particular to an optical display device suitable for eyes, intelligent glasses and an imaging method.

Background

With the rapid development of scientific technology, the types of display devices are more and more abundant. Virtual Reality (VR) is a new practical technology developed in the 20 th century. The virtual reality technology comprises a computer, electronic information and simulation technology, and the basic realization mode is that the computer simulates a virtual environment so as to provide people with environmental immersion. At present, the VR mode is realized by combining a display screen and an optical amplification lens to form VR glasses, an image source is amplified through the amplification capacity of the lens to give people strong immersion feeling, but because the resolution of the display screen for manufacturing the VR glasses on the market is not high at present, the VR glasses have a screen window effect, so that eyes can directly see pixel points of the display screen, the display screen is seen through the screen window, and the visual experience of people is influenced.

The present invention relates to an Augmented Reality (AR) technology, and more particularly, to a technology for displaying a virtual image and a real scene in a combined manner in real time, which has a basic optical principle that light carrying real world scene information and virtual image information is simultaneously incident to human eyes, and the image information transmitted on two optical paths is fused at the human eyes, so that the human eyes simultaneously obtain a mixed image of the real world scene information and the virtual image, thereby achieving an Augmented Reality effect.

Disclosure of Invention

An object of the present application is to provide an optical display device, smart glasses, and an imaging method suitable for eyes, so as to solve the above problems. The embodiment of the application realizes the aim through the following technical scheme.

In a first aspect, embodiments of the present application provide an optical display device suitable for an eye, comprising a mirror, a reflective layer, and a MEMS laser projector, the mirror comprising an elliptical reflective curved surface having a first focus and a second focus; the reflectivity of the reflecting layer is 50% -98%, and the reflecting layer is arranged in a manner of being attached to the elliptic reflecting curved surface; the MEMS laser projector is used for emitting a projection light beam from the first focus, and the projection light beam is reflected by the elliptic reflecting curved surface and then enters the second focus and enters eyes.

In one embodiment, a MEMS laser projector includes a laser generator for emitting a laser beam, a MEMS micro-mirror, and a drive unit; the MEMS micro-mirror is arranged at the first focus and used for reflecting the laser beam to the elliptic reflecting curved surface; the driving unit is connected with the MEMS micro-mirror and used for controlling the deflection angle of the MEMS micro-mirror so as to adjust the incidence angle of the laser beam.

In one embodiment, the MEMS laser projector further comprises a beam collimating module for collimating the laser beam emitted from the laser generator and then emitting the collimated laser beam to the MEMS micro-mirror.

In one embodiment, the reflectivity is 85% -98% to reduce external light from entering the eye.

In one embodiment, the reflectivity is 50% -70% so that the projection beam and external light are mixed into the eye.

In one embodiment, the optical display device further includes a light beam adjusting module, located between the first focus and the elliptic reflecting curved surface, for collimating and diffusing the projection light beam and then emitting the collimated and diffused projection light beam to the elliptic reflecting curved surface.

In one embodiment, the beam conditioning module comprises a lens assembly comprising at least one lens.

In one embodiment, the projection beam has a width of 2mm to 8mm when entering the eye.

In a second aspect, an embodiment of the present application provides an intelligent glasses, including a glasses body, further including the above optical display device, the optical display device is disposed on the glasses body.

In a third aspect, an embodiment of the present application further provides an imaging method of the optical display device according to the first aspect, where the imaging method includes:

the MEMS laser projector emits a projection beam from the first focal point;

the projection light beam is reflected by the elliptic reflecting curved surface and then enters the second focus and enters the eye.

Compared with the prior art, the optical display device, the smart glasses and the imaging method provided by the embodiment of the application have the advantages that the projection light beam emitted by the MEMS laser projector from the first focus is reflected by the elliptic reflection curved surface and then enters the second focus, when eyes observe at the second focus, the projection light beam can form a virtual image on the retina, so that the optical display device can be used as both a VR display device and an AR display device.

Drawings

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

Fig. 1 is a schematic structural diagram of an optical display device according to an embodiment of the present application.

Fig. 2 is a schematic cross-sectional view of a mirror of an optical display device provided in an embodiment of the present application.

Fig. 3 is a schematic structural diagram of a MEMS laser projector of an optical display device according to an embodiment of the present disclosure.

Fig. 4 is another schematic structural diagram of an optical display device according to an embodiment of the present application.

Fig. 5 is an image propagation diagram of an optical display device provided in an embodiment of the present application.

Fig. 6 is a schematic view of an ellipse in the related art.

Fig. 7 is a schematic beam propagation diagram of an optical display device according to an embodiment of the present application.

Fig. 8 is a schematic structural diagram of smart glasses provided in an embodiment of the present application.

Fig. 9 is a flowchart of an imaging method of an optical display device according to an embodiment of the present application.

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 illustrative and are only for the purpose of 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.

Fig. 1 is a schematic structural diagram of an optical display device provided in an embodiment of the present application, and as shown in fig. 1, an optical display device 100 includes a mirror 10, a MEMS (micro electro mechanical Systems) laser projector 20, and a reflective layer 50 (see fig. 2 in detail), where the mirror 10 includes an elliptic reflective curved surface 11, and the elliptic reflective curved surface 11 has a first focus 12 and a second focus 13. The reflectivity of the reflecting layer 50 is 50% -98%, and the reflecting layer 50 is attached to the elliptic reflecting curved surface 11. The MEMS laser projector 20 is configured to emit a projection beam 30 from the first focal point 12, and the projection beam 30 is reflected by the elliptic reflecting curved surface 11 and then enters the second focal point 13 and enters the eye 40.

The optical display device 100 utilizes the optical characteristics of an ellipse: when the light beam is emitted from one focal point and reflected by the elliptic wall, the light beam necessarily passes through another focal point, so that the projection light beam 30 emitted from the first focal point 12 can be incident to the second focal point 13 after being reflected by the elliptic reflecting curved surface 11, and when the eye 40 observes at the second focal point 13, the projection light beam 30 can form a virtual image on the retina, so that the optical display device 100 can be used as a VR display device. Compared with the existing VR display device, the optical display device 100 generates a projection beam through the MEMS laser projector 20, the MEMS laser projection belongs to a scanning type projection display technology, and images in a laser scanning manner, and can modulate an illumination angle of the laser beam by using a rotation motion of the MEMS micro-mirror, so that a projection screen view field can be subdivided according to the illumination angle, and a screen window effect in the existing VR display device can be solved.

In addition, the reflectivity of the reflective layer 50 is 50% to 98%, and external light can also be transmitted to the eye 40 through the mirror 10 to form an environment image, so that a user can see not only a virtual image provided by the MEMS laser projector 20, but also a real image of the external environment, thereby obtaining a virtual reality display effect obtained by superimposing the virtual image and the real image. Compared with the existing AR glasses, the MEMS laser projector 20 has the advantages of small size (e.g., about 6mm in thickness), light weight (e.g., 10 g), and the like, and the reflector 10 has a simple structure, thereby effectively reducing the structural complexity of the optical display device 100 and facilitating the manufacturing process.

In this embodiment, the reflector 10 may be a semi-ellipsoidal shell structure, the elliptical reflecting curved surface 11 is an inner surface of the reflector 10, the reflector 10 further includes an outer surface 15, the outer surface 15 and the elliptical reflecting curved surface 11 are spaced from each other, and the spacing between the outer surface 15 and the elliptical reflecting curved surface 11 is equal at all positions, so that the thickness of the reflector 10 is uniform, and the reflector 10 can be conveniently processed. Of course, the reflector 10 may be a tilted spherical reflector, an aspherical reflector, an elliptical reflector, an ellipsoidal reflector, or some other reflector, as long as the reflector 10 has an elliptical reflecting surface 11 capable of providing the first focus and the second focus.

The reflector 10 further includes an end surface 16 connecting the elliptical reflecting curved surface 11 and the outer surface 15, and the end surface 16 may be a flat surface to further facilitate the manufacturing of the reflector 10.

In this embodiment, the mirror 10 has a plane of symmetry 14, the plane of symmetry 14 being perpendicular to the line connecting the first focal point 12 and the second focal point 13 and being located intermediate the first focal point 12 and the second focal point 13. The reflector 10 has a plane-symmetrical structure, is easy to process, and can ensure the processing precision in the processing process.

The reflector 10 may be located on the same side of a connection line between the first focal point 12 and the second focal point 13, that is, the elliptical reflecting curved surface 11 and the end surface 16 of the outer surface 15 are located on the same side of the first focal point 12 and the second focal point 13, so that the overall size of the product may be reduced by minimizing the space occupied by the reflector 10 without affecting the reflection of the projection light beam 30, and the product may be conveniently carried or used by a user.

In one embodiment of the present application, the reflectivity of the reflective layer 50 is 85% -98% to reduce the external light entering the eye 40, so that the optical display device 100 is more suitable for VR applications and can achieve good VR display effect. The reflectivity of reflector layer 50 can be selected according to actual demand, and reflector layer 50's reflectivity is big more, and is better to the reflection effect of outside light, can realize immersing the better VR display effect of sense.

As an example, the reflective layer 50 may be a total reflection film, the reflectivity of which may be greater than 95%, and the total reflection film is attached to the elliptical reflective curved surface 11, and is used for reflecting the projection beam 30 to the second focal point 13 and isolating external light. When the eyes 40 observe at the second focus 13, the reflection effect of light can be enhanced by the total reflection film, and external light can be prevented from being incident on the eyes 40, so that strong immersion feeling is brought to people, and a good VR display effect is realized. The reflector 10 may be made of glass or plastic material, and the total reflection film may be a total reflection metal film or a total reflection dielectric film with uniform thickness.

In another embodiment of the present application, the reflective layer 50 has a reflectivity of 50% -70% so that the projection beam 30 and the external light are mixed into the eye 40, so that the eye 40 can observe the virtual image and the real image at the same time, thereby obtaining the display effect of AR. The reflectivity of the reflective layer 50 can be selected according to actual requirements, and the smaller the reflectivity of the reflective layer 50 is, the better the transmission effect on external light is, and a real image can be seen more clearly.

As an example, the reflective layer 50 may be a transflective film, the reflectivity of which may be between 50% and 55%, and the transflective film is attached to the elliptical reflective curved surface 11 for reflecting the projection beam 30 and transmitting external light. When the eye 40 observes at the second focal point 13, external light can be incident on the eye 40 through the transflective film, and the projection light 30 is reflected to the eye 40 through the transflective film. The reflecting mirror 10 may be made of a transparent organic material such as PET (Polyethylene terephthalate), PMMA (polymethyl methacrylate), or the like, and the visible light transmittance of the reflecting mirror 10 may be controlled to be more than 90%. The semi-transparent semi-reflective film can be a nano metal coating such as aluminum metal, silver metal or an aluminum-silver metal composition, and the reflectivity of the nano metal coating to visible light is gradually improved and the transmissivity to visible light is gradually reduced along with the increase of the thickness of the nano metal coating, so that the proportion of transmitted light and reflected light can be controlled through the thickness of the nano metal coating, and further description is omitted.

Fig. 3 is a schematic structural diagram of a MEMS laser projector according to an embodiment of the present disclosure, and in conjunction with fig. 1 and 3, the MEMS laser projector 20 includes a laser generator 21, a MEMS micro-mirror 22, and a driving unit (not shown).

Laser generator 21 is used for sending laser beam, and laser generator 21 can be the RGB laser pipe, and the RGB laser pipe is including being used for taking place ruddiness red laser pipe, being used for sending green glow green laser pipe and being used for sending blue light blue laser pipe, and ruddiness, green glow and blue light can join and form laser beam.

The projection beam 30 may be composed of a set of parallel rays, and the width of the projection beam 30 when it is incident on the eye 40 is in the range of 2mm to 8mm to fit the field of view of the human eye.

As an example, the red laser tube may emit red light with a wavelength of 635nm, the green laser tube may emit green light with a wavelength of 531nm, and the blue laser tube may emit blue light with a wavelength of 452nm, so that the power consumption of the laser generator 21 can be controlled to a milliwatt level, and the power of the laser generator 21 can be reduced.

The MEMS micro-mirror 22 is disposed at the first focal point 12 for reflecting the laser beam to the elliptic reflecting curved surface 11. The MEMS micro-mirror 22 can reflect the laser beam generated by the laser generator 21 to form the projection beam 30 emitted from the first focal point 12, and the user can see the corresponding projection image due to the persistence of vision of the human eye as long as the MEMS micro-mirror 22 scans at a fast enough speed. Positioning the MEMS micro-mirror 22 at the first focal point 12 ensures that the projection beam 30 is incident from the first focal point 12 and is reflected by the elliptic reflective curved surface 11 to the second focal point 13. The MEMS micro-mirror 22 can deflect in a first direction 221 and a second direction 222, and the first direction 221 and the second direction 222 are perpendicular to each other. As an example, the first direction 221 may be a horizontal direction, and the second direction 222 may be a vertical direction.

The driving unit is connected to the MEMS micro-mirror 22 for controlling the deflection angle of the MEMS micro-mirror 22 to adjust the incident angle of the projection beam 30.

The optical display device 100 may further include a main control unit connected to the driving unit for generating a deflection driving signal and transmitting the deflection driving signal to the driving unit, and the driving unit may control the MEMS micro-mirror 22 to deflect by thermal driving, electrostatic driving, piezoelectric driving, electromagnetic driving, or the like according to the deflection driving signal.

As an example, when the laser generator 21 emits laser corresponding to a certain image according to the control timing, the driving unit synchronously controls the MEMS micro-mirrors 22 to deflect, so that the laser corresponding to a certain image emitted by the laser generator 21 can be reflected to the corresponding position by the MEMS micro-mirrors 22. For example, after decoding, point a of the image is red laser, point B different from point a is blue laser, and the scanning sequence is to scan point a and then scan point B, when the laser generator 21 generates red laser according to the corresponding control timing, the driving unit synchronously controls the MEMS micro-mirror 22 to deflect to the position corresponding to point a, so that the red laser is just reflected to point a, and when the laser generator 21 generates blue laser according to the corresponding control timing, the driving unit synchronously controls the MEMS micro-mirror 22 to deflect to the position corresponding to point B, so that the blue laser is just reflected to point B, and so on, thereby scanning the image is achieved, and the eye can receive the image.

In this embodiment, the MEMS laser projector 20 further includes a light beam collimating module 23, and the light beam collimating module 23 is disposed on the light path between the laser generator 21 and the MEMS micro-mirror 22, and is configured to collimate the laser beam emitted by the laser generator 21 and then emit the collimated laser beam to the MEMS micro-mirror 22, so that the laser beam can be effectively utilized in the subsequent light path.

The light beam collimating module 23 can use optical fiber as a light beam shaping device, and inserts optical elements such as micro-lens between the laser generator 21 and the optical fiber, so as to effectively converge the output light beam of the laser generator 21, compress the divergence angle of the light beam, and perform good collimation on the light beam.

Fig. 4 is another schematic structural diagram of the optical display device according to the embodiment of the present application, and referring to fig. 1 and 4, the optical display device 100 further includes a light beam adjusting module 70, where the light beam adjusting module 70 is disposed on the optical path between the first focal point 12 and the elliptic curved reflective surface 11, and is configured to collimate and diffuse the projection light beam 30 reflected by the MEMS micro-mirror 22 and then emit the light beam to the elliptic curved reflective surface 11.

The beam adjusting module 70 is used for further collimating and shaping the projection beam 30 on the basis that the beam collimating module 23 primarily collimates and shapes the projection beam 30, so that the beam finally incident to the elliptic reflecting curved surface 11 can be ensured to be a collimated beam, and the utilization rate of the projection beam 30 is improved. The beam adjusting module 70 is further configured to diffuse the projection light beam 30 reflected by the MEMS micro-mirror 22, so that the projection light beam 30 can be incident on the elliptical reflecting curved surface 11 from various directions, and the field of view of the optical display device 100 is enlarged, thereby displaying more contents to a user.

Beam conditioning module 70 may include a lens group 71, lens group 71 including at least one lens 710. For example, the number of the lenses 710 may be one, the lenses 710 include an incident surface 711 and an exit surface 712 which are oppositely disposed, the incident surface 711 is disposed toward the MEMS laser projector 20, the projection light beam 30 is refracted at the exit surface 712 after being incident through the incident surface 711, and the traveling direction of the projection light beam 30 may be adjusted by the refraction effect of the exit surface 712, so that the projection light beam 30 can be incident on the elliptic curved reflecting surface 11 at a larger deflection angle, thereby expanding the field of view of the optical display device 100.

The beam conditioning module 70 may further include a collimating lens, which may be disposed on the optical path between the lens group 71 and the elliptical reflecting curved surface 11, or between the lens group 71 and the MEMS laser projector 20, for collimating the projected beam 30.

FIG. 5 is a schematic representation of the propagation of an image of an optical display device according to an embodiment of the present disclosure, and in conjunction with FIGS. 1, 4 and 5, the projected light beam 30 from the first focal point 12 of the MEMS laser projector 20 may include a light beam L₀Light beam L₀Can be used in

Therein, α₀、β₀、γ₀Is the value of the angle, and is,

a function is calculated for the correlation. In an exemplary manner, the first and second electrodes are,

light beam L₀After the refraction of the light beam adjusting module 70 and the reflection of the elliptic reflecting curved surface 11, the light beam reachesAt a second focal point 13, a beam L is generated₀Corresponding light beam L₁When eye 40 is viewed at second focal point 13, beam L₁The human eye coordinate system, beam L, can be established by imaging the eye on the retina₁The angular coordinate of the human eye coordinate system can be used

Therein, α₁、β₁、γ₁Is the value of the angle, and is,

a function is calculated for the correlation. In an exemplary manner, the first and second electrodes are,

。

light beam L₀The light beam L is obtained after being refracted by the light beam adjusting module 70 and reflected by the elliptic reflecting curved surface 11 in sequence₁Light beam L₁And light beam L₀And correspond to each other.

Light beam L₁And a light beam L₀Still substantially conforming to the associated trigonometric relationships, e.g. sine and cosine theorem, beam L₁

And light beam L₀

The corresponding relation can be obtained by calculating according to a trigonometric function relation and a refraction law of the combined light.

Light beam L₁Passes through the eyes to reach the retina, forming a virtual image in front of the eyes, which in this embodiment is equivalent to a single projected picture at a distance D from the eyes, i.e., virtual image plane 41.

Distance D and light beam L₁Angle of incidence of

And (4) correlating. The picture of the virtual image surface 41 is formed by splicing one point, and can be usedContinued lattice coordinate c (m)₁，n₁) Description, as can be seen from the figure, m₁=D*Tanα₁，n₁=D*Tanβ₁。

Due to light beam L₀Is related to the deflection angle of the MEMS micro-mirror 22 according to the light beam L₀And a light beam L₁And the coordinate relationship of (c), and the light beam L₁And the virtual image lattice, the virtual image lattice formed by the optical display device 100 is controlled by the deflection angle of the MEMS micro-mirror 22, i.e. the optical display device 100 can control the incident angle of the projection beam 30 through the MEMS laser projector 20 to obtain the final virtual image.

The sine theorem is exemplified below in connection with FIG. 6, as shown in FIG. 6, F₁、F₂Are two focuses of the ellipse respectively, P is any point on the ellipse, a is a major axis, b is a minor axis, c is a focal length,

point P and point F₁The distance between the two or more of the two or more,

point P and point F₂In a triangle F₁PF₂The sine relationship is established as follows:

setting up

；

Order to

；

Then the following results are obtained:

by

It is possible to obtain:

in the case of a known focal length c, i.e. according to angle

，

One value determines the size of the other value.

Fig. 7 is another schematic light beam propagation diagram of the optical display device according to the embodiment of the present application, and the correspondence relationship between the angle coordinates of the projection light beam 30 during the process from the incident of the first focal point 12 to the exit of the second focal point 13 is exemplarily described below with reference to fig. 1, fig. 5, and fig. 7.

The coordinate system is established with reference to the second focus, assuming that the projected light beam emitted from MEMS laser projector 20 includes light beam L₀₁

Light beam L₀₂

And a light beam L₀₃

Light beam L₀₁Light beam L₀₂And a light beam L₀₃All located on the plane of the first focal point 12, the second focal point 13, and the center point of the MEMS micro-mirror 22, beam L₀₁Light beam L₀₂And a light beam L₀₃Are different from each other in incident angle, light beam L₀₁Light beam L₀₂And a light beam L₀₃By elliptical reflection curveAfter being reflected by the surface 11, the light beams L are respectively formed₁₁

Light beam L₁₂

And a light beam L₁₃

Incident to the eye, Beam L₁₁May be a light ray normally incident on the eye, beam L₁₂And a light beam L₁₃And light beam L₁₁At an angle of 45 deg. and respectively located at the light beam L₁₁Two sides.

To be provided with

For example, light beam L₀₁Can be used (cos α)₀₁，cosβ₀₁，cosγ₀₁) To show, beam L₀₂And a light beam L₀₃Reference beam L₀₁Light beam L₁₁Can be used (cos α)₁₁，cosβ₁₁，cosγ₁₁) To show, beam L₁₂And a light beam L₁₃Reference beam L₁₁Assuming that the major axis of the elliptic reflecting curved surface 11 is 50mm and the minor axis is 30mm, the light beam L₀₁Light beam L₀₂And a light beam L₀₃Incident to the elliptic reflecting curved surface 11, the optical focal length of the curved surface reflector at the incident position is 9mm, the focal length of the lens group 71 is 57.86mm, and the optical focal length can be obtained according to a bifocal curved surface model, light refraction and the like:

beam L passing through the elliptical first focal point₀₁Angular coordinate of (cos α)₀₁，cosβ₀₁，cosγ₀₁) = (0, 0.28349, -0.95897), corresponding light beam L when passing through the second focus of the ellipse₁₁Angular coordinate of (cos α)₁₁，cosβ₁₁，cosγ₁₁）=（0，-1，0）；

Beam L passing through the elliptical first focal point₀₂Angular coordinate of (cos α)₀₂，cosβ₀₂，cosγ₀₂) = (0, 0.68745, -0.72632), corresponding light beam L when passing through the second focus of the ellipse₁₂Angular coordinate of (cos α)₁₂，cosβ₁₂，cosγ₁₂）=(0，0.11719，-0.99311)；

Beam L passing through the elliptical first focal point₀₃Angular coordinate of (cos α)₀₃，cosβ₀₃，cosγ₀₃) = (0, 0.11719, -0.99311), corresponding light beam L when passing through the second focus of the ellipse₁₃Angular coordinate of (cos α)₁₃，cosβ₁₃，cosγ₁₃）=(0，-0.70711，0.70711)。

According to the calculation formula m₁=D*Tanα₁，n₁=D*Tanβ₁The beam L can be calculated further₁₁Form corresponding virtual image point coordinates (m)₁₁，n₁₁) Similarly, light beam L₁₂Light beam L₁₃Respectively expressed as (m)₁₂，n₁₂）、（m₁₂，n₁₂) It follows that the light beam L emitted from the MEMS laser projector 20₀₁Light beam L₀₂And a light beam L₀₃With virtual image point coordinates (m)₁₁，n₁₁）、（m₁₂，n₁₂）、（m₁₂，n₁₂) In one-to-one correspondence, the optical display device 100 may control the angle of incidence of the projected beam through the MEMS laser projector 20 to obtain the final virtual image.

Fig. 8 is a schematic structural diagram of smart glasses according to an embodiment of the present application, and as shown in fig. 1 and 8, the smart glasses 200 include a glasses body 21 and an optical display device 100, and the optical display device 100 is disposed on the glasses body 21. The eyeglasses body 21 may be a housing structure or a frame structure as long as it can be used to mount the optical display device 100. As an example, the glasses body 21 may include a frame 211 and a temple 212 provided to the frame 211, the mirror 10 may be provided to the frame 211, and the MEMS laser projector 20 may be provided to the temple 212.

The smart glasses 200 may be VR glasses or AR glasses, and when the smart glasses 200 are VR glasses, the MEMS laser projector generates a projection beam, and an illumination angle of the laser beam can be modulated by a rotational motion of the MEMS micro-mirror, so that a projection screen view field can be subdivided according to the illumination angle, and a screen window effect in the existing VR glasses can be solved. When intelligent glasses 200 is AR glasses, its simple structure compares in current AR glasses and effectively reduces structural complexity, conveniently processes manufacturing.

Fig. 9 is a flowchart of an imaging method of an optical display device according to an embodiment of the present application, and as shown in fig. 1, 3 and 9, the imaging method may include step S1 and step S2.

Step S1, the MEMS laser projector 20 emits the projection beam 30 from the first focal point 12;

in step S2, the projection light beam 30 is reflected by the elliptic reflecting curved surface 11 and enters the second focal point 13 and enters the eye 40.

The imaging method provided by the embodiment of the present application emits the projection beam 30 from the first focal point 12 through the MEMS laser projector 20, the projection beam 30 is reflected by the elliptic curved reflecting surface 11 and then enters the second focal point 13, and when the eye observes at the second focal point 12, the projection beam 30 can form a virtual image on the retina. According to the imaging method, the projection light beam is generated through the MEMS laser projector, and the screen window effect in the conventional VR display device can be solved. In some embodiments, step S1 further includes:

the laser emitter 21 emits a laser beam; and

the MEMS micro-mirror 22 reflects the laser beam to the elliptic reflective curved surface 11.

It can be clearly understood by those skilled in the art that the imaging method of the optical display device 100 provided in the present embodiment is implemented based on the optical display device 100 in the foregoing embodiment, and for convenience and brevity of description, details of the imaging method may refer to the detailed description of the optical display device 100 in the foregoing embodiment, and are not repeated herein.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. An optical display device adapted for use with an eye, comprising:

a mirror comprising an elliptical reflective curved surface having a first focus and a second focus;

the reflectivity of the reflecting layer is 50% -98%, and the reflecting layer is arranged in a manner of being attached to the elliptic reflecting curved surface; and

the MEMS laser projector is used for emitting a projection light beam from the first focus, and the projection light beam is reflected by the elliptic reflecting curved surface and then enters the second focus and enters the eye.

2. The optical display device according to claim 1, wherein the MEMS laser projector comprises a laser generator for emitting a laser beam to the MEMS micro-mirror, a MEMS micro-mirror, and a drive unit; the MEMS micro-mirror is arranged at the first focus and used for reflecting the laser beam to the elliptic reflecting curved surface; the driving unit is connected to the MEMS micro-mirror and used for controlling the deflection angle of the MEMS micro-mirror so as to adjust the incidence angle of the laser beam.

3. The optical display device according to claim 2, wherein the MEMS laser projector further comprises:

and the light beam collimation module is used for collimating the laser beam emitted by the laser generator and then emitting the laser beam to the MEMS micro-mirror.

4. An optical display device as claimed in claim 1, characterized in that the reflectivity is 85-98% to reduce the entrance of external light into the eye.

5. The optical display device according to claim 1, wherein the reflectivity is 50% -70% so that the projection beam and external light are mixed into the eye.

6. The optical display device according to claim 1, further comprising:

and the light beam adjusting module is positioned between the first focus and the elliptic reflection curved surface and is used for collimating and diffusing the projection light beam and then sending the projection light beam to the elliptic reflection curved surface.

7. The optical display device according to claim 6, wherein the beam conditioning module comprises a lens group comprising at least one lens.

8. An optical display device as claimed in claim 1, characterized in that the width of the projection beam when entering the eye is 2-8 mm.

9. Smart glasses comprising a glasses body, characterized in that the smart glasses further comprise an optical display device according to any one of claims 1-8, the optical display device being provided to the glasses body.

10. An imaging method of an optical display device according to any one of claims 1 to 8, characterized in that the imaging method comprises:

the MEMS laser projector emits the projected beam from the first focal point;

the projection light beam is reflected by the elliptic reflecting curved surface and then enters the second focus and enters the eye.

Images