Augmented reality glasses and diffractive optical waveguide device

Abstract

The invention discloses augmented reality glasses and a diffractive optical waveguide device. The augmented reality glasses comprise a negative diopter lens, a diffraction optical waveguide lens, a coupling-in grating, a coupling-out grating, a positive diopter lens and a projection device. The negative diopter lens is located on the environment-facing side of the diffractive optical waveguide lens, and the positive diopter lens is located on the human eye-facing side of the diffractive optical waveguide lens. The absolute value of the diopter of the negative diopter lens has positive influence on the critical angle; the positive diopter lens is used for correcting the influence of the negative diopter lens on ambient light. According to the augmented reality glasses, by introducing the negative diopter lenses, the critical angle can be effectively increased, so that a user cannot feel the existence of rainbow patterns even if the incident angle of ambient light is relatively large; therefore, the effect of inhibiting the rainbow lines can be effectively improved. Meanwhile, by introducing the positive diopter lens, the influence of the negative diopter lens on the ambient light can be corrected, and it is ensured that the human eyes can normally observe the external real scene through the diffraction optical waveguide device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of diffractive optical waveguide, in particular to augmented reality glasses and diffractive optical waveguide device. BACKGROUND

[0002] Augmented reality glasses (AR glasses) are intelligent wearable devices that combine the real world and the virtual world by using augmented reality, audio-video fusion and waveguide lens technology to collect data of real scenes through cameras and sensors.

[0003] Rainbow effect is one of the core problems affecting the user experience of AR glasses, which is caused by the diffraction of external light into the waveguide grating, resulting in visual pollution, i.e. colored stripes or halos appear in the user's field of view, affecting image clarity and user experience. Rainbow effect is an inherent defect of diffractive light waves, and how to improve the suppression effect of rainbow stray light is a research hotspot for those skilled in the art.

[0004] In addition, among the many optical waveguide "difficulties", forward light leakage is also one of the core problems affecting user experience, which allows the outside world to see the content of the glasses' light emission or even the picture, thus damaging the privacy of the product and making the wearer look very strange. How to reduce the problem of forward light leakage is also a research hotspot for those skilled in the art. SUMMARY

[0005] The present application provides augmented reality glasses to solve the problem of poor rainbow effect and high production cost of products in the prior art. The present application further provides a diffractive optical waveguide device.

[0006] The present application provides an augmented reality glass, comprising:

[0007] a negative power lens, a diffractive optical waveguide lens, a positive power lens, a coupling-in grating, a coupling-out grating, and a projection device; the negative power lens is located on the side of the diffractive optical waveguide lens facing the environment, the positive power lens is located on the side of the diffractive optical waveguide lens facing the eye, and the coupling-in grating and the coupling-out grating are located on the surface of the diffractive optical waveguide lens.

[0008] By adjusting the absolute value of the refractive power of the negative power lens, the lower limit value of the included angle between the environmental light entering the eye in the form of rainbow and the normal line of the waveguide is adjusted, so as to adjust the incident angle range of the environmental light producing rainbow effect. The larger the absolute value of the refractive power is, the larger the lower limit value of the included angle is, and the smaller the incident angle range is. The positive power lens is used to correct the influence of the negative power lens on the environmental light.

[0009] Optionally, the out-coupling grating is an out-coupling grating with a negative refractive power, used to correct the influence of the positive refractive power lens on the virtual image information entering the human eye through the out-coupling grating, the virtual image information being generated by the projection device.

[0010] Optionally, the sum of the refractive powers of the out-coupling grating and the positive refractive power lens is 0.

[0011] Optionally, the sum of the refractive powers of the out-coupling grating and the positive refractive power lens is 0.

[0012] Optionally, the sum of the refractive powers of the out-coupling grating and the positive refractive power lens is 0.

[0013] Optionally, by adjusting the curvature of the incident position of the ambient light on the negative refractive power lens, the lower limit of the included angle is adjusted, and the larger the curvature of the light incident position, the larger the lower limit of the included angle at this position.

[0014] The application provides a diffractive optical waveguide device, comprising:

[0015] a negative refractive power lens, a diffractive optical waveguide lens, a positive refractive power lens, an in-coupling grating, and an out-coupling grating.

[0016] The negative refractive power lens is located on the side of the diffractive optical waveguide lens facing the environment, the positive refractive power lens is located on the side of the diffractive optical waveguide lens facing the human eye, and the in-coupling grating and the out-coupling grating are located on the surface of the diffractive optical waveguide lens.

[0017] By adjusting the absolute value of the refractive power of the negative refractive power lens, the lower limit of the included angle of the ambient light entering the human eye in the form of a rainbow stripe relative to the waveguide normal line is adjusted, so as to adjust the incident angle range of the ambient light generating the rainbow stripe, and the larger the absolute value of the refractive power, the larger the lower limit of the included angle, and the smaller the incident angle range; the positive refractive power lens is used to correct the influence of the negative refractive power lens on the ambient light.

[0018] Optionally, the out-coupling grating is an out-coupling grating with a negative refractive power, used to correct the influence of the positive refractive power lens on the virtual image information entering the human eye through the out-coupling grating.

[0019] Optionally, the sum of the refractive powers of the out-coupling grating and the positive refractive power lens is 0.

[0020] Optionally, the sum of the refractive powers of the out-coupling grating and the positive refractive power lens is 0.

[0021] Optionally, the sum of the refractive powers of the out-coupling grating and the positive refractive power lens is 0.

[0022] Optionally, by adjusting the curvature of the incident position of ambient light in the negative diopter lens, the lower limit of the included angle is adjusted, and the curvature of the incident position of light is increased, and the lower limit of the included angle at the position is correspondingly increased.

[0023] The application further provides an augmented reality glasses, comprising:

[0024] The negative diopter lens, the diffractive optical waveguide lens, the positive diopter lens, the in-coupling grating and the out-coupling grating; the positive diopter lens is located on the side of the diffractive optical waveguide lens facing the environment, the negative diopter lens is located on the side of the diffractive optical waveguide lens facing the human eye, and the in-coupling grating and the out-coupling grating are located on the surface of the diffractive optical waveguide lens; by adjusting the diopter of the positive diopter lens, the suppression effect of the forward light leakage is adjusted, and the positive diopter is increased, and the suppression effect of the forward light leakage is correspondingly improved; the negative diopter lens is used for correcting the influence of the positive diopter lens on the ambient light.

[0025] The application further provides a diffractive optical waveguide device, comprising:

[0026] The negative diopter lens, the diffractive optical waveguide lens, the positive diopter lens, the in-coupling grating and the out-coupling grating; the positive diopter lens is located on the side of the diffractive optical waveguide lens facing the environment, the negative diopter lens is located on the side of the diffractive optical waveguide lens facing the human eye, and the in-coupling grating and the out-coupling grating are located on the surface of the diffractive optical waveguide lens; by adjusting the diopter of the positive diopter lens, the suppression effect of the forward light leakage is adjusted, and the positive diopter is increased, and the suppression effect of the forward light leakage is correspondingly improved; the negative diopter lens is used for correcting the influence of the positive diopter lens on the ambient light.

[0027] Compared with the prior art, the application has the following advantages:

[0028] The augmented reality glasses provided by the embodiments of the present application comprise a diffractive optical waveguide device and a projection device. The diffractive optical waveguide device comprises a negative refractive power lens, a diffractive optical waveguide lens, a coupling-in grating, a coupling-out grating, and a positive refractive power lens. The negative refractive power lens is located on the side of the diffractive optical waveguide lens facing the environment, the positive refractive power lens is located on the side of the diffractive optical waveguide lens facing the human eye, and the coupling-in grating and the coupling-out grating are located on the surface of the diffractive optical waveguide lens. By adjusting the absolute value of the refractive power of the negative refractive power lens, the lower limit value of the included angle of the environmental light entering the human eye in the form of a rainbow stripe relative to the waveguide normal line is adjusted, so as to adjust the incident angle range of the environmental light generating the rainbow stripe. When the absolute value of the refractive power is larger, the lower limit value of the included angle is correspondingly larger, and the incident angle range is correspondingly smaller. The positive refractive power lens is used to correct the influence of the negative refractive power lens on the environmental light. The augmented reality glasses can effectively increase the lower limit value of the included angle (critical angle) by introducing the negative refractive power lens, so that even if the incident angle of the environmental light is large, the user cannot feel the existence of the rainbow stripe. Therefore, the effect of suppressing the rainbow stripe can be effectively improved. Meanwhile, by introducing the positive refractive power lens, the influence of the negative refractive power lens on the environmental light can be corrected, so as to ensure that the human eye can normally observe the real scene outside through the diffractive optical waveguide device. In addition, the diffractive optical waveguide device for suppressing the rainbow stripe based on the refractive power lens has the advantages of small technical difficulty and low production cost, and is convenient for popularization of the augmented reality glasses in daily life.

[0029] The diffractive optical waveguide device provided by the embodiments of the present application comprises a negative refractive power lens, a diffractive optical waveguide lens, a coupling-in grating, a coupling-out grating, and a positive refractive power lens. The negative refractive power lens is located on the side of the diffractive optical waveguide lens facing the environment, the positive refractive power lens is located on the side of the diffractive optical waveguide lens facing the human eye, and the coupling-in grating and the coupling-out grating are located on the surface of the diffractive optical waveguide lens. By adjusting the absolute value of the refractive power of the negative refractive power lens, the lower limit value of the included angle of the environmental light entering the human eye in the form of a rainbow stripe relative to the waveguide normal line is adjusted, so as to adjust the incident angle range of the environmental light generating the rainbow stripe. When the absolute value of the refractive power is larger, the lower limit value of the included angle is correspondingly larger, and the incident angle range is correspondingly smaller. The positive refractive power lens is used to correct the influence of the negative refractive power lens on the environmental light. The diffractive optical waveguide device can effectively increase the lower limit value of the included angle (critical angle) by introducing the negative refractive power lens, so that even if the incident angle of the environmental light is large, the user cannot feel the existence of the rainbow stripe. Therefore, the effect of suppressing the rainbow stripe can be effectively improved. Meanwhile, by introducing the positive refractive power lens, the influence of the negative refractive power lens on the environmental light can be corrected, so as to ensure that the human eye can normally observe the real scene outside through the diffractive optical waveguide device. In addition, the diffractive optical waveguide device for suppressing the rainbow stripe based on the refractive power lens has the advantages of small technical difficulty and low production cost.

[0030] The augmented reality glasses provided by the embodiments of the present application comprise: a negative diopter lens, a diffractive optical waveguide lens, a positive diopter lens, a coupling-in grating, a coupling-out grating, and a projection device; the positive diopter lens is located on the side of the diffractive optical waveguide lens facing the environment, the negative diopter lens is located on the side of the diffractive optical waveguide lens facing the human eye, and the coupling-in grating and the coupling-out grating are located on the surface of the diffractive optical waveguide lens; the suppression effect of the forward light leakage is adjusted by adjusting the diopter of the positive diopter lens; the larger the positive diopter is, the better the suppression effect of the forward light leakage is; and the negative diopter lens is used for correcting the influence of the positive diopter lens on the ambient light. The augmented reality glasses can effectively control the propagation direction of the light leakage picture by introducing the positive diopter lens, so that the forward light leakage is not obvious, that is, the person on the other side is difficult to perceive the forward light leakage of the glasses in the normal case when the user communicates face to face with the other person; therefore, the effect of suppressing the forward light leakage can be effectively improved. Meanwhile, the influence of the positive diopter lens on the ambient light can be corrected by introducing the negative diopter lens, so that the human eye can normally observe the real scene outside through the diffractive optical waveguide device. In addition, the diffractive optical waveguide device for suppressing the forward light leakage based on the diopter lens has the advantages of small technical difficulty and low production cost, and is convenient for the popularization of the augmented reality glasses in daily life.

[0031] The diffractive optical waveguide device provided by the embodiments of the present application comprises: a negative diopter lens, a diffractive optical waveguide lens, a positive diopter lens, a coupling-in grating, and a coupling-out grating; the positive diopter lens is located on the side of the diffractive optical waveguide lens facing the environment, the negative diopter lens is located on the side of the diffractive optical waveguide lens facing the human eye, and the coupling-in grating and the coupling-out grating are located on the surface of the diffractive optical waveguide lens; the suppression effect of the forward light leakage is adjusted by adjusting the diopter of the positive diopter lens; the larger the positive diopter is, the better the suppression effect of the forward light leakage is; and the negative diopter lens is used for correcting the influence of the positive diopter lens on the ambient light. The diffractive optical waveguide device can effectively control the propagation direction of the light leakage picture by introducing the positive diopter lens, so that the forward light leakage is not obvious, that is, the person on the other side is difficult to perceive the forward light leakage of the glasses in the normal case when the user communicates face to face with the other person; therefore, the effect of suppressing the forward light leakage can be effectively improved. Meanwhile, the influence of the positive diopter lens on the ambient light can be corrected by introducing the negative diopter lens, so that the human eye can normally observe the real scene outside through the diffractive optical waveguide device. In addition, the diffractive optical waveguide device for suppressing the forward light leakage based on the diopter lens has the advantages of small technical difficulty and low production cost. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The structural schematic diagram of the embodiment of the augmented reality glasses provided by the present application;

[0033] Figure 2 The comparison diagram of the effect of suppressing the rainbow stripe of the embodiment of the augmented reality glasses provided by the present application;

[0034] Figure 3 Another structural diagram of an embodiment of the augmented reality glasses provided in the present application is shown in the figure.

[0035] Figure 4 An effect comparison diagram of the light leakage suppression of an embodiment of the augmented reality glasses provided in the present application is shown in the figure. DETAILED DESCRIPTION

[0036] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application. However, the present application can be practiced in a large number of other ways than those described herein, and one skilled in the art can make similar extensions without departing from the spirit of the present application, and therefore the present application is not limited to the specific implementations disclosed below.

[0037] In the present application, augmented reality glasses and diffractive optical waveguide devices are provided. In the following, various schemes are described in detail one by one in various embodiments.

[0038] First Embodiment

[0039] Reference is made to Figure 1 which is a structural diagram of the augmented reality glasses of the present application. In the present embodiment, the augmented reality glasses include the following components: a negative power lens 1, an out-coupling grating 2, an in-coupling grating 3, a diffractive optical waveguide lens 4, a positive power lens 5, and a projection device 9. The negative power lens is located on the side of the diffractive optical waveguide lens 4 facing the environment, and the positive power lens 5 is located on the side of the diffractive optical waveguide lens 4 facing the human eye. The gap 6 between the negative power lens 1 and the diffractive optical waveguide lens 4, and the gap 7 between the diffractive optical waveguide lens 4 and the positive power lens 5. In addition, the augmented reality glasses can also include a frame 8, and in specific implementations, the frame can also not be included. Figure 1 A human eye 10 is also shown.

[0040] The augmented reality glasses are mainly composed of a diffractive optical waveguide device and a projection device 9, and the projection device (optical-mechanical module) 9 is responsible for generating virtual image information and modulating it into a collimated light beam. The projection device in the common augmented reality glasses mainly has several types such as DLP, LCOS, Micro LED, MEMS, etc. The diffractive optical waveguide device includes a negative power lens 1, an out-coupling grating 2, an in-coupling grating 3, a diffractive optical waveguide lens 4, and a positive power lens 5. The diffractive optical waveguide lens 4 is the core element of the augmented reality glasses, which is responsible for comfortably presenting the virtual image information projected by the projection device after transmission and expansion to the human eye, and ensuring that the human eye can normally observe the outside real scene through the diffractive optical waveguide lens 4.

[0041] Diffractive optical waveguide, also known as holographic waveguide or grating waveguide, is an optical see-through type augmented reality (AR) near-eye display (NED) technology combining physical optics and geometric optics. The technology makes nano-grating structure on a transparent optical lens, uses the diffraction of nano-grating structure to realize beam deflection, uses the light waveguide principle of light beam in the transparent optical lens to realize light beam transmission and expansion, and can comfortably present virtual information such as images and videos in front of eyes, while the optical system is as light and transparent as ordinary glasses. That is, the diffractive optical waveguide technology realizes the image near-eye display of ultra-thin lens and ultra-large screen through the deflection, transmission and expansion of light beam by grating diffraction and light waveguide principle. When the virtual image information projected by the projection device 9 is incident after the coupling-in grating 3, the virtual image information is almost losslessly propagated (total internal reflection) inside, and then enters the human eye after the coupling-out grating 2.

[0042] The augmented reality glasses project virtual images into the user's field of view through near-eye display technology, but due to the dispersion characteristics of the diffractive optical waveguide, different wavelengths of light are offset during propagation, resulting in colored stripes, i.e. rainbow stripes, appearing at the edges of the image. This phenomenon significantly reduces the visual comfort and practicality of augmented reality display.

[0043] The augmented reality glasses provided by the embodiments of the present application adjust the lower limit value of the angle of the ambient light entering the human eye in the form of rainbow stripes relative to the normal line of the waveguide by adjusting the absolute value of the refractive power of the negative refractive power lens, to adjust the incident angle range of the ambient light that produces rainbow stripes. The absolute value of the refractive power is larger, and the lower limit value of the angle is correspondingly larger, and the incident angle range is correspondingly smaller. The critical angle θ is the lower limit value of the angle of the ambient light entering the human eye in the form of rainbow stripes relative to the normal line of the waveguide. If the angle of the external ambient light relative to the normal line of the diffractive optical waveguide lens 4 is less than the critical angle, such as the angle of the light ray 1 in FIG. 1, the ambient light is not incident into the human eye after being diffracted by the coupling-out grating 2; if the angle of the external ambient light relative to the normal line of the diffractive optical waveguide lens 4 is greater than the critical angle, such as the angle of the light ray 2 in FIG. 2, the ambient light is incident into the human eye in the form of rainbow stripes after being diffracted by the coupling-out grating 2, and the user feels the existence of rainbow stripes. Figure 1 Figure 1

[0044] The augmented reality glasses provided by the embodiments of the present application adjust the lower limit value of the angle of the ambient light entering the human eye in the form of rainbow stripes relative to the normal line of the waveguide by adjusting the absolute value of the refractive power of the negative refractive power lens, to adjust the incident angle range of the ambient light that produces rainbow stripes. The absolute value of the refractive power is larger, and the lower limit value of the angle is correspondingly larger, and the incident angle range is correspondingly smaller. The critical angle θ is the lower limit value of the angle of the ambient light entering the human eye in the form of rainbow stripes relative to the normal line of the waveguide. If the angle of the external ambient light relative to the normal line of the diffractive optical waveguide lens 4 is less than the critical angle, such as the angle of the light ray 1 in FIG. 1, the ambient light is not incident into the human eye after being diffracted by the coupling-out grating 2; if the angle of the external ambient light relative to the normal line of the diffractive optical waveguide lens 4 is greater than the critical angle, such as the angle of the light ray 2 in FIG. 2, the ambient light is incident into the human eye in the form of rainbow stripes after being diffracted by the coupling-out grating 2, and the user feels the existence of rainbow stripes. Figure 1 ​​It can be seen that in the embodiment, the diffractive optical waveguide device not only includes the diffractive optical waveguide lens 4, and the in-coupling grating 3 and the out-coupling grating 2 on the surface of the diffractive optical waveguide lens 4, but also includes the negative diopter lens 1 located on the side of the diffractive optical waveguide lens 4 facing the environment, and the positive diopter lens 5 located on the side of the diffractive optical waveguide lens 4 facing the human eye. Diopter (D) is a physical quantity describing the ability of a lens to converge (positive diopter for convex lens) or diverge (negative diopter for concave lens) light rays, and the unit is diopter (D). The lower limit value of the included angle of the environmental light entering the human eye in the form of a rainbow pattern relative to the waveguide normal is taken as the critical angle. The diopter of the negative diopter lens 1 is negative, and the absolute value of the negative diopter has a positive effect on the critical angle θ, and the positive diopter lens is used to correct the effect of the negative diopter lens on the environmental light.

[0045] The absolute value of the diopter of the negative diopter lens 1 has a positive effect on the critical angle, that is, the greater the absolute value of the negative diopter, the greater the critical angle. From the formula Figure 1 It can be seen that as the absolute value of the diopter of the negative diopter lens 1 increases, the critical angle also increases accordingly. The first absolute value of the diopter corresponds to the critical angle θ1, the second absolute value of the diopter corresponds to the critical angle θ2, and the third absolute value of the diopter corresponds to the critical angle θ3. Among them, the first absolute value of the diopter is less than the second absolute value of the diopter, and the second absolute value of the diopter is less than the third absolute value of the diopter. The diopter of the negative diopter lens 1 also affects the incident angle of the external environmental light. When the incident angle of the environmental light is greater than the critical angle θ3, the environmental light will be blocked, which greatly reduces the incident angle range of the rainbow pattern.

[0046] In specific implementation, by reasonably designing the diopter of the negative diopter lens, the rainbow pattern can be effectively suppressed. Figure 2 The suppression effect of the AR glasses provided by the embodiment of the present application on the rainbow pattern is shown. The left graph shows that the user sees the rainbow pattern when using the existing AR glasses, and the right graph shows that the user cannot feel the existence of the rainbow pattern when using the AR glasses provided by the embodiment of the present application.

[0047] In one example, the augmented reality glasses provided by the embodiment of the present application adjust the curvature of the incident position of the environmental light on the negative diopter lens, adjust the lower limit value of the included angle, and the curvature of the light incident position increases, so that the lower limit value of the included angle at this position also increases, thereby making the curvature of the incident position of the environmental light on the negative diopter lens 1 also have a positive effect on the critical angle, and the greater the curvature of the light incident position, the greater the critical angle at this position, thereby realizing dynamic compensation of the critical angle in a complex light path environment, and effectively improving the light energy utilization rate.

[0048] The in-coupling grating 3 and the out-coupling grating 2 are arranged on the surface of the diffractive optical waveguide lens 4. As Figure 1As shown, the in-coupling grating 3 and the out-coupling grating 2 can be arranged on the surface of the diffractive optical waveguide lens 4 facing the environment. In practice, the in-coupling grating 3 and the out-coupling grating 2 can be arranged on the surface of the diffractive optical waveguide lens 4 facing the human eye.

[0049] The positive power lens 5 is used to correct the effect of the negative power lens 1 on ambient light. In practice, the sum of the powers of the negative power lens 1 and the positive power lens 5 can be 0, and such a combination of the negative power lens 1 and the positive power lens 5 is suitable for a user who looks straight ahead. The sum of the powers of the negative power lens 1 and the positive power lens 5 can also be positive, and such a combination of the negative power lens 1 and the positive power lens 5 is suitable for a user who has a positive power by nature. The sum of the powers of the negative power lens 1 and the positive power lens 5 can also be negative, and such a combination of the negative power lens 1 and the positive power lens 5 is suitable for a user who has a negative power by nature.

[0050] In one example, the out-coupling grating 2 adopts an out-coupling grating with a negative power, which is used to correct the effect of the positive power lens 5 on the virtual image information entering the human eye through the out-coupling grating 2. The projection device 9 projects the virtual image information to the in-coupling grating 3, and the virtual image information is almost losslessly propagated (total internal reflection) inside the diffractive optical waveguide lens 4 after being incident on the in-coupling grating 3, and then enters the human eye through the out-coupling grating 2. This embodiment can correct the effect of the negative power lens 1 on ambient light by introducing the positive power lens 5, so as to ensure that the human eye can normally observe the real scene outside through the diffractive optical waveguide device. At the same time, by further introducing the out-coupling grating 2 with a negative power, the effect of the positive power lens 5 on the virtual image information can be corrected, so as to avoid the virtual image information entering the human eye through the out-coupling grating 2 from being affected by power and distortion, and the virtual image information is comfortably presented in front of the human eye.

[0051] In one example, for the diffractive optical path, the sum of the diffractive powers of the out-coupling grating 2 and the positive power lens 5 is 0, negative, or positive, which can be set according to the power requirement of the user by nature.

[0052] As can be seen from the above embodiments, the augmented reality glasses provided by the embodiments of the present application include a diffractive optical waveguide device and a projection device. The diffractive optical waveguide device includes a negative refractive power lens, a diffractive optical waveguide lens, a coupling-in grating, a coupling-out grating, and a positive refractive power lens. The negative refractive power lens is located on the side of the diffractive optical waveguide lens facing the environment, the positive refractive power lens is located on the side of the diffractive optical waveguide lens facing the human eye, and the coupling-in grating and the coupling-out grating are located on the surface of the diffractive optical waveguide lens. By adjusting the absolute value of the refractive power of the negative refractive power lens, the lower limit value (critical angle) of the included angle of the environmental light entering the human eye in the form of a rainbow stripe relative to the waveguide normal is adjusted, so as to adjust the incident angle range of the environmental light generating the rainbow stripe. The larger the absolute value of the refractive power is, the larger the lower limit value of the included angle is, and the smaller the incident angle range is. The positive refractive power lens is used to correct the influence of the negative refractive power lens on the environmental light. The augmented reality glasses can effectively increase the critical angle by introducing the negative refractive power lens, so that even if the incident angle of the environmental light is large, the user cannot feel the existence of the rainbow stripe. Therefore, the effect of suppressing the rainbow stripe can be effectively improved. Meanwhile, by introducing the positive refractive power lens, the influence of the negative refractive power lens on the environmental light can be corrected, so as to ensure that the human eye can normally observe the real scene outside through the diffractive optical waveguide device. In addition, the diffractive optical waveguide device based on the refractive power lens for suppressing the rainbow stripe has the advantages of small technical difficulty and low production cost, and is convenient for popularizing the augmented reality glasses in daily life.

[0053] Second embodiment

[0054] In the above embodiments, an augmented reality glasses is provided, and the present application further provides a diffractive optical waveguide device corresponding thereto, which can be used in the fields of augmented reality (AR), virtual reality (VR), optical communication, laser display, etc. The device corresponds to the above-mentioned embodiments of the augmented reality glasses. Since the embodiments of the diffractive optical waveguide device are basically similar to the embodiments of the augmented reality glasses, the description is relatively simple, and the relevant parts can be referred to the part of the description of the embodiments of the augmented reality glasses. The embodiments of the diffractive optical waveguide device described below are only illustrative.

[0055] The present application further provides a diffractive optical waveguide device, which includes a negative refractive power lens 1, a coupling-out grating 2, a coupling-in grating 3, a diffractive optical waveguide lens 4, and a positive refractive power lens 5. The negative refractive power lens is located on the side of the diffractive optical waveguide lens 4 facing the environment, and the positive refractive power lens 5 is located on the side of the diffractive optical waveguide lens 4 facing the human eye. There is a gap 6 between the negative refractive power lens 1 and the diffractive optical waveguide lens 4, and a gap 7 between the diffractive optical waveguide lens 4 and the positive refractive power lens 5. The diffractive optical waveguide lens 4 is the core element of the diffractive optical waveguide device, which is responsible for comfortably presenting the virtual image information projected into the coupling-in grating 3 after transmission and expansion to the human eye, and ensuring that the human eye can normally observe the real scene outside through the diffractive optical waveguide lens 4.

[0056] Diffractive optical waveguide, also known as holographic waveguide or grating waveguide, is a kind of optical see-through augmented reality (AR) near-eye display (NED) technology combining physical optics and geometric optics. The nanometer grating structure is made on the transparent optical lens, the deflection of light beam is realized by the diffraction of nanometer grating structure, the light beam conduction and expansion are realized by the light waveguide principle in the transparent optical lens, and the virtual information such as image and video can be comfortably presented in front of the eyes. That is, the diffractive optical waveguide technology realizes the image near-eye display of ultra-thin lens and ultra-large screen by the deflection, conduction and expansion of light beam through grating diffraction and light waveguide principle. When the virtual image information projected by the projection device 9 is incident through the in-coupling grating 3, the virtual image information propagates almost losslessly (total internal reflection) inside, and then enters the human eye through the out-coupling grating 2.

[0057] In practical applications, the virtual image is projected into the user's field of view through the near-eye display technology, but due to the dispersion characteristics of the diffractive optical waveguide, the light of different wavelengths is shifted during propagation, resulting in the appearance of colored stripes, i.e. rainbow stripes, at the edges of the image. This phenomenon significantly reduces the visual comfort and practicality of virtual image display.

[0058] The diffractive optical waveguide device provided by the embodiments of the present application adjusts the lower limit value (critical angle) of the included angle of the ambient light entering the human eye in the form of rainbow stripes relative to the normal line of the waveguide by adjusting the absolute value of the refractive power of the negative refractive power lens, so as to adjust the incident angle range of the ambient light generating rainbow stripes. The absolute value of the refractive power is larger, and the lower limit value of the included angle is correspondingly larger, and the incident angle range is correspondingly smaller. The critical angle θ refers to the lower limit value of the included angle of the ambient light entering the human eye in the form of rainbow stripes relative to the normal line of the waveguide. If the included angle of the external ambient light relative to the normal line of the diffractive optical waveguide lens 4 is less than the critical angle, such as the angle of the light ray 1 in Figure 1 , the ambient light is not diffracted into the human eye after the out-coupling grating 2; if the included angle of the external ambient light relative to the normal line of the diffractive optical waveguide lens 4 is greater than the critical angle, such as the angle of the light ray 2 in Figure 1 , the ambient light is diffracted into the human eye in the form of rainbow stripes after the out-coupling grating 2, and the user feels the existence of rainbow stripes.

[0059] From Figure 1It can be seen that in the embodiment, the diffractive optical waveguide device not only includes the diffractive optical waveguide lens 4, and the in-coupling grating 3 and the out-coupling grating 2 on the surface of the diffractive optical waveguide lens 4, but also includes the negative diopter lens 1 located on the side of the diffractive optical waveguide lens 4 facing the environment, and the positive diopter lens 5 located on the side of the diffractive optical waveguide lens 4 facing the human eye. Diopter (D) is a physical quantity describing the ability of a lens to converge (positive diopter for convex lens) or diverge (negative diopter for concave lens) light rays, and the unit is diopter (D). The lower limit value of the included angle of the environmental light entering the human eye in the form of a rainbow pattern relative to the waveguide normal is taken as the critical angle. The diopter of the negative diopter lens 1 is negative, and the absolute value of the negative diopter has a positive effect on the critical angle θ, and the positive diopter lens is used to correct the effect of the negative diopter lens on the environmental light.

[0060] The absolute value of the diopter of the negative diopter lens 1 has a positive effect on the critical angle, that is, the greater the absolute value of the negative diopter, the greater the critical angle. From the formula Figure 1 It can be seen that as the absolute value of the diopter of the negative diopter lens 1 increases, the critical angle also increases accordingly. The first absolute value of the diopter corresponds to the critical angle θ1, the second absolute value of the diopter corresponds to the critical angle θ2, and the third absolute value of the diopter corresponds to the critical angle θ3. Among them, the first absolute value of the diopter is less than the second absolute value of the diopter, and the second absolute value of the diopter is less than the third absolute value of the diopter. The diopter of the negative diopter lens 1 also affects the incident angle of the external environmental light. When the incident angle of the environmental light is greater than the critical angle θ3, the environmental light will be blocked, which greatly reduces the incident angle range of the rainbow pattern.

[0061] In specific implementation, by reasonably designing the diopter of the negative diopter lens, the rainbow pattern can be effectively suppressed. Figure 2 The suppression effect of the rainbow pattern by the diffractive optical waveguide device provided in the embodiments of the present application is shown. The left figure shows that the user sees the rainbow pattern when using the existing diffractive optical waveguide device, and the right figure shows that the user cannot feel the existence of the rainbow pattern when using the diffractive optical waveguide device provided in the embodiments of the present application.

[0062] In one example, the diffractive optical waveguide device provided in the embodiments of the present application adjusts the curvature of the incident position of the environmental light on the negative diopter lens to adjust the lower limit value of the included angle. The greater the curvature of the light incident position, the greater the lower limit value of the included angle at this position, thereby making the curvature of the incident position of the environmental light on the negative diopter lens 1 also have a positive effect on the critical angle. The greater the curvature of the light incident position, the greater the critical angle at this position, thereby achieving dynamic compensation of the critical angle in a complex light path environment, and effectively improving the light energy utilization rate.

[0063] The positive diopter lens 5 is used to correct the influence of the negative diopter lens 1 on ambient light. In implementation, the sum of the diopters of the negative diopter lens 1 and the positive diopter lens 5 can be 0, and this combination of the negative diopter lens 1 and the positive diopter lens 5 is suitable for a user who looks straight. The sum of the diopters of the negative diopter lens 1 and the positive diopter lens 5 can also be positive, and this combination of the negative diopter lens 1 and the positive diopter lens 5 is suitable for a user who has a positive diopter by nature. The sum of the diopters of the negative diopter lens 1 and the positive diopter lens 5 can also be negative, and this combination of the negative diopter lens 1 and the positive diopter lens 5 is suitable for a user who has a negative diopter by nature.

[0064] In one example, the out-coupling grating 2 adopts an out-coupling grating with a negative diopter, which is used to correct the influence of the positive diopter lens 5 on the virtual image information that enters the human eye through the out-coupling grating 2. The virtual image information of the in-coupling grating 3 is incident through the in-coupling grating 3, propagates almost losslessly (total internal reflection) inside the diffractive optical waveguide lens 4, and enters the human eye through the out-coupling grating 2. This embodiment can correct the influence of the negative diopter lens 1 on ambient light by introducing the positive diopter lens 5, so as to ensure that the human eye can normally observe the real scene outside through the diffractive optical waveguide device. At the same time, by further introducing the out-coupling grating 2 with a negative diopter, the influence of the positive diopter lens 5 on the virtual image information can be corrected, so as to avoid the influence of the virtual image information that enters the human eye through the out-coupling grating 2 on the diopter and distortion, and the virtual image information is comfortably presented in front of the human eye.

[0065] In one example, for the diffractive optical path, the sum of the diffractive diopters of the out-coupling grating 2 and the positive diopter lens 5 is 0, negative, or positive, which can be set according to the diopter requirement of the user by nature.

[0066] From the above embodiments, the diffraction optical waveguide device provided by the embodiments of the present application comprises: a negative refractive lens, a diffraction optical waveguide lens, a coupling-in grating, a coupling-out grating, and a positive refractive lens. The negative refractive lens is located on the side of the diffraction optical waveguide lens facing the environment, the positive refractive lens is located on the side of the diffraction optical waveguide lens facing the human eye, and the coupling-in grating and the coupling-out grating are located on the surface of the diffraction optical waveguide lens. By adjusting the absolute value of the refractive power of the negative refractive lens, the lower limit value (critical angle) of the included angle of the environmental light entering the human eye in the form of a rainbow stripe relative to the waveguide normal line is adjusted, so as to adjust the incident angle range of the environmental light generating the rainbow stripe. The larger the absolute value of the refractive power is, the larger the lower limit value of the included angle is, and the smaller the incident angle range is. The positive refractive lens is used to correct the influence of the negative refractive lens on the environmental light. The diffraction optical waveguide device can effectively increase the critical angle by introducing the negative refractive lens, so that even if the incident angle of the environmental light is large, the user cannot feel the existence of the rainbow stripe. Therefore, the effect of suppressing the rainbow stripe can be effectively improved. Meanwhile, by introducing the positive refractive lens, the influence of the negative refractive lens on the environmental light can be corrected, so as to ensure that the human eye can normally observe the real scene outside through the diffraction optical waveguide device. In addition, the diffraction optical waveguide device for suppressing the rainbow stripe based on the refractive lens has the advantages of small technical difficulty and low production cost.

[0067] Third embodiment

[0068] In the above embodiments, an augmented reality glasses is provided, and the present application also provides an augmented reality glasses for suppressing the front light leakage of the augmented reality glasses. The device corresponds to the above-mentioned embodiments of the augmented reality glasses. Since the augmented reality glasses of the present embodiment is basically similar to the first embodiment of the augmented reality glasses, the description is relatively simple, and the relevant parts can be referred to the part of the first embodiment of the augmented reality glasses. The following described embodiments of the augmented reality glasses are only illustrative.

[0069] Please refer to Figure 3 which is a structural schematic diagram of the augmented reality glasses of the present embodiment. In the present embodiment, the augmented reality glasses comprise the following components: a positive refractive lens 1, a coupling-out grating 2, a coupling-in grating 3, a diffraction optical waveguide lens 4, a negative refractive lens 5, and a projection device 9. The positive refractive lens is located on the side of the diffraction optical waveguide lens 4 facing the environment, and the negative refractive lens 5 is located on the side of the diffraction optical waveguide lens 4 facing the human eye. The gap 6 between the positive refractive lens 1 and the diffraction optical waveguide lens 4, and the gap 7 between the diffraction optical waveguide lens 4 and the negative refractive lens 5. In addition, the augmented reality glasses can also comprise a frame 8, and in the specific implementation, the frame 8 can also not be included. Figure 3 The human eye 10 is also shown.

[0070] The augmented reality glasses can produce forward light leakage, which causes the outside world to see the content of the glasses light or even picture, destroys the privacy of the product, and makes the wearer look very strange, affecting the user experience. The augmented reality glasses provided by the embodiments of the present application can adjust the refractive power of the positive refractive lens to adjust the suppression effect of the forward light leakage. The larger the positive refractive power is, the better the suppression effect of the forward light leakage is. The refractive power of the positive refractive lens 1 has a positive effect on suppressing the forward light leakage, that is, the larger the positive refractive power is, the better the effect of suppressing the forward light leakage is. In specific implementation, the forward light leakage can be effectively suppressed by reasonably designing the refractive power of the positive refractive lens 1. Figure 4 The suppression effect of the AR glasses provided by the embodiments of the present application on the forward light leakage is shown. The left picture shows that the outside user can see the forward light leakage when the user uses the existing AR glasses. The right picture shows that the forward light leakage deviates from the line of sight of the outside user and the existence of the forward light leakage cannot be felt at all when the user uses the AR glasses provided by the embodiments of the present application.

[0071] The negative refractive lens 5 is used to correct the influence of the positive refractive lens 1 on ambient light. In specific implementation, the sum of the refractive powers of the positive refractive lens 1 and the negative refractive lens 5 can be 0. This combination of the positive refractive lens 1 and the negative refractive lens 5 is suitable for a user who looks straight. The sum of the refractive powers of the positive refractive lens 1 and the negative refractive lens 5 can also be positive. This combination of the positive refractive lens 1 and the negative refractive lens 5 is suitable for a user who has a positive refractive power. The sum of the refractive powers of the positive refractive lens 1 and the negative refractive lens 5 can also be negative. This combination of the positive refractive lens 1 and the negative refractive lens 5 is suitable for a user who has a negative refractive power.

[0072] In one example, the out-coupling grating 2 adopts an out-coupling grating with a positive refractive power, which is used to correct the influence of the negative refractive lens 5 on the virtual image information entering the human eye through the out-coupling grating 2. The projection device 9 projects the virtual image information to the in-coupling grating 3. After the virtual image information is incident through the in-coupling grating 3, it propagates almost losslessly (total internal reflection) inside the diffractive optical waveguide lens 4 and enters the human eye through the out-coupling grating 2. In this embodiment, by introducing the negative refractive lens 5, the influence of the positive refractive lens 1 on ambient light can be corrected, so that the human eye can normally observe the outside real scene through the diffractive optical waveguide device. At the same time, by further introducing the out-coupling grating 2 with a positive refractive power, the influence of the negative refractive lens 5 on the virtual image information can be corrected, so that the virtual image information entering the human eye through the out-coupling grating 2 does not have refractive power and distortion, and the virtual image information is comfortably presented in front of the human eye.

[0073] In one example, for the diffractive optical path, the sum of the diffractive refractive powers of the out-coupling grating 2 and the negative refractive lens 5 is 0, negative or positive, which can be set according to the refractive power requirement of the user.

[0074] As can be seen from the above embodiments, the augmented reality glasses provided by the embodiments of the present application include: a negative refractive power lens, a diffractive optical waveguide lens, a positive refractive power lens, a coupling-in grating, a coupling-out grating, and a projection device; the positive refractive power lens is located on the side of the diffractive optical waveguide lens facing the environment, the negative refractive power lens is located on the side of the diffractive optical waveguide lens facing the human eye, and the coupling-in grating and the coupling-out grating are located on the surface of the diffractive optical waveguide lens; the suppression effect of the forward light leakage is adjusted by adjusting the refractive power of the positive refractive power lens, and the larger the positive refractive power is, the better the suppression effect of the forward light leakage is; the negative refractive power lens is used to correct the influence of the positive refractive power lens on the ambient light. The augmented reality glasses can effectively control the propagation direction of the light leakage picture by introducing the positive refractive power lens, so that the forward light leakage is not obvious, that is, the other party is difficult to detect the forward light leakage of the glasses in the normal case when the user communicates face to face with the other party; therefore, the effect of suppressing the forward light leakage can be effectively improved. Meanwhile, the influence of the positive refractive power lens on the ambient light can be corrected by introducing the negative refractive power lens, so that the human eye can normally observe the real scene outside through the diffractive optical waveguide device. In addition, the diffractive optical waveguide device based on the refractive power lens for suppressing the forward light leakage has the advantages of small technical difficulty and low production cost, and is convenient for popularization of the augmented reality glasses in daily life.

[0075] Fourth embodiment

[0076] In the above embodiments, an augmented reality glasses is provided, and the present application further provides a diffractive optical waveguide device corresponding thereto, which can be used in the fields of augmented reality (AR), virtual reality (VR), optical communication, laser display, etc. The device corresponds to the above-mentioned embodiments of the augmented reality glasses. Since the embodiments of the diffractive optical waveguide device are basically similar to the embodiments of the augmented reality glasses, the description is relatively simple, and the relevant parts can be referred to the part of the description of the embodiments of the augmented reality glasses. The embodiments of the diffractive optical waveguide device described below are only illustrative.

[0077] The present application further provides a diffractive optical waveguide device, which includes the following components: a positive refractive power lens 1, a coupling-out grating 2, a coupling-in grating 3, a diffractive optical waveguide lens 4, and a negative refractive power lens 5. The positive refractive power lens is located on the side of the diffractive optical waveguide lens 4 facing the environment, and the negative refractive power lens 5 is located on the side of the diffractive optical waveguide lens 4 facing the human eye. There is a gap 6 between the positive refractive power lens 1 and the diffractive optical waveguide lens 4, and there is a gap 7 between the diffractive optical waveguide lens 4 and the negative refractive power lens 5.

[0078] The diffraction optical waveguide device can produce forward light leakage, which can cause the outside world to see the light and even the content of the picture emitted by the diffraction optical waveguide device, damage the privacy of the product, and make the wearer look very strange, affecting the user experience. The diffraction optical waveguide device provided by the embodiment of the present application adjusts the refractive power of the positive refractive lens to adjust the suppression effect of the forward light leakage. The larger the positive refractive power is, the better the suppression effect of the forward light leakage is. The refractive power of the positive refractive lens 1 has a positive effect on suppressing the forward light leakage, that is, the larger the positive refractive power is, the better the effect of suppressing the forward light leakage is. In specific implementation, the forward light leakage can be effectively suppressed by reasonably designing the refractive power of the positive refractive lens 1. Figure 4 The suppression effect of the diffraction optical waveguide device provided by the embodiment of the present application on the forward light leakage is shown. The left figure shows that the outside user can see the forward light leakage when the user uses the existing diffraction optical waveguide device. The right figure shows that the forward light leakage is affected by the positive refractive lens 1 when the user uses the diffraction optical waveguide device provided by the embodiment of the present application, and deviates from the line of sight of the outside user, so that the existence of the forward light leakage cannot be felt at all.

[0079] The negative refractive lens 5 is used to correct the influence of the positive refractive lens 1 on ambient light. In specific implementation, the sum of the refractive powers of the positive refractive lens 1 and the negative refractive lens 5 can be 0. This combination of the positive refractive lens 1 and the negative refractive lens 5 is suitable for a user who looks straight. The sum of the refractive powers of the positive refractive lens 1 and the negative refractive lens 5 can also be positive. This combination of the positive refractive lens 1 and the negative refractive lens 5 is suitable for a user who has a positive refractive power. The sum of the refractive powers of the positive refractive lens 1 and the negative refractive lens 5 can also be negative. This combination of the positive refractive lens 1 and the negative refractive lens 5 is suitable for a user who has a negative refractive power.

[0080] In one example, the out-coupling grating 2 adopts an out-coupling grating with a positive refractive power, which is used to correct the influence of the negative refractive lens 5 on the virtual image information entering the human eye through the out-coupling grating 2. The projection device 9 projects the virtual image information to the in-coupling grating 3. After the virtual image information is incident through the in-coupling grating 3, it propagates almost losslessly (total internal reflection) inside the diffraction optical waveguide lens 4 and enters the human eye through the out-coupling grating 2. By introducing the negative refractive lens 5, the embodiment can correct the influence of the positive refractive lens 1 on ambient light, so that the human eye can normally observe the outside real scene through the diffraction optical waveguide device. At the same time, by further introducing the out-coupling grating 2 with a positive refractive power, the influence of the negative refractive lens 5 on the virtual image information can be corrected, so that the virtual image information entering the human eye through the out-coupling grating 2 is not affected by refractive power and distortion, and the virtual image information is comfortably presented in front of the human eye.

[0081] In one example, for the diffractive optical path, the sum of the diffractive power of the out-coupling grating 2 and the negative power lens 5 is 0, negative or positive, which can be set according to the user's own refractive needs.

[0082] As can be seen from the above examples, the diffractive optical waveguide device provided by the embodiments of the present application includes a negative power lens, a diffractive optical waveguide lens, a positive power lens, an in-coupling grating and an out-coupling grating. The positive power lens is located on the side of the diffractive optical waveguide lens facing the environment, the negative power lens is located on the side of the diffractive optical waveguide lens facing the human eye, and the in-coupling grating and the out-coupling grating are located on the surface of the diffractive optical waveguide lens. By adjusting the refractive power of the positive power lens, the suppression effect of the forward light leakage is adjusted. The larger the positive power is, the better the suppression effect of the forward light leakage is. The negative power lens is used to correct the influence of the positive power lens on the ambient light. This diffractive optical waveguide device can effectively control the propagation direction of the light leakage picture by introducing the positive power lens, so that the forward light leakage is not obvious, i.e. in normal circumstances, the other party is difficult to detect the forward light leakage of the glasses when the user communicates face to face with the other party. Therefore, the effect of suppressing the forward light leakage can be effectively improved. At the same time, by introducing the negative power lens, the influence of the positive power lens on the ambient light can be corrected to ensure that the human eye can normally observe the real scene outside through the diffractive optical waveguide device. In addition, the diffractive optical waveguide device for suppressing the forward light leakage based on the power lens also has the advantages of small technical difficulty and low production cost.

[0083] Although the above is disclosed with the preferred embodiments, it is not intended to limit the present application, and any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application should be subject to the scope defined by the claims of the present application.

Claims

1. An augmented reality eyeglass, characterized by, The device comprises: a negative power lens, a diffractive optical waveguide lens, a positive power lens, a coupling-in grating, a coupling-out grating, and a projection device; the negative power lens is located on the side of the diffractive optical waveguide lens facing the environment, the positive power lens is located on the side of the diffractive optical waveguide lens facing the human eye, and the coupling-in grating and the coupling-out grating are located on the surface of the diffractive optical waveguide lens; By adjusting the absolute value of the refractive power of the negative power lens, the lower limit value of the included angle of the environmental light entering the human eye in the form of a rainbow stripe relative to the waveguide normal line is adjusted, so as to adjust the incident angle range of the environmental light generating the rainbow stripe; the absolute value of the refractive power is larger, and the lower limit value of the included angle is correspondingly larger, and the incident angle range is correspondingly smaller; the positive power lens is used for correcting the influence of the negative power lens on the environmental light.

2. The virtual reality glasses of claim 1, wherein, The coupling-out grating is a coupling-out grating with negative power, which is used for correcting the influence of the positive power lens on the virtual image information entering the human eye through the coupling-out grating.

3. The virtual reality glasses according to claim 2, wherein The sum of the refractive powers of the coupling-out grating and the positive power lens is 0.

4. The virtual reality glasses according to claim 1, wherein The sum of the refractive powers of the negative power lens and the positive power lens is 0, positive power or negative power.

5. The virtual reality glasses according to claim 1, wherein By adjusting the curvature of the incident position of the environmental light on the negative power lens, the lower limit value of the included angle is adjusted; the curvature of the light incident position is larger, and the lower limit value of the included angle at the position is correspondingly larger.

6. A diffractive optical waveguide device, characterized by The device comprises: a negative power lens, a diffractive optical waveguide lens, a positive power lens, a coupling-in grating, and a coupling-out grating; the negative power lens is located on the side of the diffractive optical waveguide lens facing the environment, the positive power lens is located on the side of the diffractive optical waveguide lens facing the human eye, and the coupling-in grating and the coupling-out grating are located on the surface of the diffractive optical waveguide lens; By adjusting the absolute value of the refractive power of the negative power lens, the lower limit value of the included angle of the environmental light entering the human eye in the form of a rainbow stripe relative to the waveguide normal line is adjusted, so as to adjust the incident angle range of the environmental light generating the rainbow stripe; the absolute value of the refractive power is larger, and the lower limit value of the included angle is correspondingly larger, and the incident angle range is correspondingly smaller; the positive power lens is used for correcting the influence of the negative power lens on the environmental light.

7. The diffractive optical waveguide device of claim 6, wherein, The coupling-out grating is a coupling-out grating with negative power, which is used for correcting the influence of the positive power lens on the virtual image information entering the human eye through the coupling-out grating.

8. The diffractive optical waveguide device according to claim 7, wherein The sum of the refractive powers of the coupling-out grating and the positive power lens is 0.

9. The diffractive optical waveguide device according to claim 1, wherein The sum of the refractive powers of the negative power lens and the positive power lens is 0, positive power or negative power.

10. The diffractive optical waveguide device according to claim 1, wherein By adjusting the curvature of the incident position of the environmental light on the negative power lens, the lower limit value of the included angle is adjusted; the curvature of the light incident position is larger, and the lower limit value of the included angle at the position is correspondingly larger.

11. An augmented reality eyeglass, characterized by, The device comprises: The application relates to a negative diopter lens, a diffractive optical waveguide lens, a positive diopter lens, a coupling-in grating, a coupling-out grating and a projection device; the positive diopter lens is located on the side of the diffractive optical waveguide lens facing the environment, the negative diopter lens is located on the side of the diffractive optical waveguide lens facing the human eye, and the coupling-in grating and the coupling-out grating are located on the surface of the diffractive optical waveguide lens; the inhibition effect of the forward light leakage is adjusted by adjusting the diopter of the positive diopter lens; when the positive diopter is larger, the inhibition effect of the forward light leakage is better; and the negative diopter lens is used for correcting the influence of the positive diopter lens on the ambient light.

12. A diffractive optical waveguide device, characterized by The application relates to a negative diopter lens, a diffractive optical waveguide lens, a positive diopter lens, a coupling-in grating, a coupling-out grating and a projection device; the positive diopter lens is located on the side of the diffractive optical waveguide lens facing the environment, the negative diopter lens is located on the side of the diffractive optical waveguide lens facing the human eye, and the coupling-in grating and the coupling-out grating are located on the surface of the diffractive optical waveguide lens; the inhibition effect of the forward light leakage is adjusted by adjusting the diopter of the positive diopter lens; when the positive diopter is larger, the inhibition effect of the forward light leakage is better; and the negative diopter lens is used for correcting the influence of the positive diopter lens on the ambient light. The application relates to a negative diopter lens, a diffractive optical waveguide lens, a positive diopter lens, a coupling-in grating, a coupling-out grating and a projection device; the positive diopter lens is located on the side of the diffractive optical waveguide lens facing the environment, the negative diopter lens is located on the side of the diffractive optical waveguide lens facing the human eye, and the coupling-in grating and the coupling-out grating are located on the surface of the diffractive optical waveguide lens; the inhibition effect of the forward light leakage is adjusted by adjusting the diopter of the positive diopter lens; when the positive diopter is larger, the inhibition effect of the forward light leakage is better; and the negative diopter lens is used for correcting the influence of the positive diopter lens on the ambient light.

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