CN114675421A - Augmented reality near-to-eye display device - Google Patents

Abstract

The invention relates to an augmented reality near-to-eye display device, comprising: the optical-mechanical system comprises an optical-mechanical system, a first waveguide group and a second waveguide group, wherein the second waveguide group and the first waveguide group are arranged in parallel, and two ends of the second waveguide group are connected to the lower surfaces of two ends of the first waveguide group through frame glue; an optical-mechanical system for emitting light to the coupling-in region of the first waveguide set; the first waveguide group comprises an incoupling grating, a first waveguide plate and a first outcoupling grating, light enters the waveguide plate through the incoupling grating and is propagated to the first outcoupling grating in a total reflection mode, negative first-order diffraction light is outcoupled to human eyes through the first outcoupling grating, and positive first-order diffraction light is outcoupled to the second waveguide group; the second waveguide group comprises a second coupling-out grating, a second waveguide plate and a coupling-out element, wherein the positive first-order diffraction light is coupled into the second waveguide plate again through the second coupling-out grating, propagates to the coupling-out element in the second waveguide plate in a total reflection mode and is coupled out through the coupling-out element.

Description

Augmented reality near-to-eye display device

Technical Field

The present disclosure relates to the field of augmented reality technologies, and in particular, to an augmented reality near-to-eye display device.

Background

Augmented Reality (AR) technology, which is a technology that generates virtual objects that do not exist in the physical world by means of computer graphics technology and visualization technology and accurately places the virtual objects in the physical world, fuses the surrounding visual environment and virtual graphics information, i.e. real environment and virtual objects are superimposed on the same picture or space in real time and a new environment with richer perception effect is presented to users. At present, AR equipment is widely applied to the fields of industrial manufacturing, maintenance, medical treatment, military, entertainment, education and the like, influences and even changes some information interaction modes in production and life of various industries, and has great potential application value.

In an AR near-eye display system, the most core optical hardware part is a waveguide coupling element, and the coupling element for AR near-eye display which is widely applied at present mainly comprises a light splitting film which is arranged in an array based on geometric optics; and volume holographic gratings based on diffractive optics, and the like. The volume holographic grating is a diffraction grating prepared by utilizing a holographic interference technology, and a series of interference fringes with alternate light and shade are formed in the photosensitive material through interference of two beams of coherent light, so that the refractive index distribution of the photosensitive material is changed according to the light and shade fringes. The volume holographic grating has the advantages of less stray light, high efficiency of negative first-order diffraction light, good wavelength and angle selectivity and the like, and particularly, the reflection volume holographic grating has a larger diffraction angle response bandwidth and a narrower diffraction wavelength response bandwidth (low dispersion), so the reflection volume holographic grating is mainly applied to the field of holographic waveguide display. However, when the reflection type volume holographic grating is used for the holographic waveguide coupling-out device, because the efficiency of the positive first-order diffraction light is also high, and the part of light can be transmitted to the outside in the opposite direction, when a person observes from the waveguide in the opposite direction, a clear image can be seen, and the concealment of the augmented reality near-eye display device is greatly reduced.

Disclosure of Invention

To overcome the problems in the related art, the present disclosure provides an augmented reality near-eye display device, thereby enhancing the concealment of an augmented reality near-eye display apparatus.

According to a first aspect of embodiments of the present disclosure, there is provided an augmented reality near-eye display device, the device comprising: the optical-mechanical system comprises an optical-mechanical system, a first waveguide group and a second waveguide group, wherein the second waveguide group and the first waveguide group are arranged in parallel, and two ends of the second waveguide group are connected to the lower surfaces of two ends of the first waveguide group through frame glue;

the optical-mechanical system is used for emitting light rays to the coupling-in area of the first waveguide group;

the first waveguide group comprises an incoupling grating, a first waveguide plate and a first outcoupling grating, the light enters the first waveguide plate through the incoupling grating and is propagated to the first outcoupling grating in the first waveguide plate in a total reflection mode, the negative first-order diffraction light is coupled out to human eyes through the first outcoupling grating, and the positive first-order diffraction light is coupled out to the second waveguide group;

the second waveguide group comprises a second coupling-out grating, a second waveguide plate and a coupling-out element, wherein the positive first-order diffracted light is coupled into the second waveguide plate again through the second coupling-out grating, propagates to the coupling-out element in the second waveguide plate in a total reflection mode, and is coupled out through the coupling-out element.

In an embodiment, preferably, the outcoupling element comprises a third outcoupling grating.

In one embodiment, preferably, the first outcoupling grating, the second outcoupling grating and the third outcoupling grating are three identical multiplexed color volume holographic gratings.

In one embodiment, preferably, the outcoupling element comprises an array of non-polarizing splitting films.

In one embodiment, preferably, the incoupling grating and the first outcoupling grating are two multiplexed color volume holographic gratings manufactured in mirror symmetry, and the second outcoupling grating and the first outcoupling grating are identical.

In one embodiment, preferably, the multiplexed color volume holographic grating comprises a reflective volume holographic grating.

In one embodiment, the multiplexed color volume holographic grating is preferably fabricated based on angle multiplexing or wavelength multiplexing techniques.

In one embodiment, preferably, the opto-mechanical system comprises a micro-display and an optical collimating system;

the micro display is arranged on a main optical axis of the optical collimating system and used for loading and outputting an image;

the optical collimation system is positioned on the light emitting surface of the micro display and used for collimating and correcting the image output by the micro display and then inputting the image into the coupling-in area of the first waveguide group.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

in the embodiment of the invention, a group of waveguide groups are added into the traditional volume holographic optical waveguide device, and the traditional volume holographic optical waveguide device is bonded by frame glue, so that the positive first-order diffracted light which is transmitted to the outside in the reverse direction can be output to the position which can avoid the range of human eyes, and the concealment of the augmented reality near-eye display equipment is enhanced.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a schematic structural diagram illustrating an augmented reality near-eye display device according to an exemplary embodiment.

Fig. 2 is a schematic structural diagram illustrating another augmented reality near-eye display device according to an example embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

Fig. 1 is a schematic structural diagram illustrating an augmented reality near-eye display device according to an exemplary embodiment, as shown in fig. 1, the device includes: the optical-mechanical system comprises an optical-mechanical system, a first waveguide group and a second waveguide group, wherein the second waveguide group and the first waveguide group are arranged in parallel, and two ends of the second waveguide group are connected to the lower surfaces of two ends of the first waveguide group through frame glue;

the optical-mechanical system is used for emitting light rays to the coupling-in area of the first waveguide group;

the first waveguide group comprises an incoupling grating, a first waveguide plate 1 and a first outcoupling grating, the light enters the waveguide plate through the incoupling grating and propagates to the first outcoupling grating in the waveguide plate in a total reflection manner, the negative first-order diffraction light is outcoupled to human eyes through the first outcoupling grating, and the positive first-order diffraction light is outcoupled to the second waveguide group;

the second waveguide group comprises a second coupling-out grating, a second waveguide plate 2 and a coupling-out element, wherein the positive first-order diffracted light is coupled into the second waveguide plate again through the second coupling-out grating, propagates to the coupling-out element in the second waveguide plate in a total reflection manner, and is coupled out through the coupling-out element.

As shown in fig. 1, in one embodiment, the outcoupling elements preferably comprise third outcoupling gratings.

In one embodiment, preferably, the first outcoupling grating, the second outcoupling grating and the third outcoupling grating are three identical multiplexed color volume holographic gratings.

The outcoupling elements can be realized in other ways than by the third outcoupling gratings described above. In one embodiment, as shown in fig. 2, the outcoupling element preferably comprises an array of non-polarizing splitting films.

In one embodiment, preferably, the incoupling grating and the first outcoupling grating are two multiplexed color volume holographic gratings manufactured in mirror symmetry, and the second outcoupling grating and the first outcoupling grating are identical.

In one embodiment, preferably, the multiplexed color volume holographic grating comprises a reflective volume holographic grating.

In one embodiment, the multiplexed color volume holographic grating is preferably fabricated based on angle multiplexing or wavelength multiplexing techniques.

In one embodiment, preferably, the opto-mechanical system comprises a micro-display and an optical collimating system;

the micro display is arranged on a main optical axis of the optical alignment system and used for loading and outputting an image;

the optical collimation system is positioned on the light emitting surface of the micro display and used for collimating and correcting the image output by the micro display and then inputting the image into the coupling-in area of the first waveguide group.

The working principle of the device is as follows: incident light is diffracted by the coupling-in multiplexing color volume holographic grating at the coupling-out end and then is coupled into the first waveguide plate, when the total reflection condition is met, the coupling-in light can be transmitted forwards to the first coupling-out multiplexing color volume holographic grating at the coupling-out end in a total reflection mode in the first waveguide plate, and finally, after the light is diffracted and output by the first coupling-out multiplexing color volume holographic grating at the coupling-out end, negative first-order diffracted light enters human eyes for imaging.

And the positive first-order diffracted light can be transmitted to the outside in the opposite direction, and in order to enhance the concealment of the augmented reality near-eye display equipment, a second waveguide group is added into the device and is bonded with the first waveguide group through frame glue. The second waveguide group comprises a second coupling-out multiplexing chromatic volume holographic grating, a second waveguide plate and a third coupling-out multiplexing chromatic volume holographic grating, as shown in FIG. 1; or the second waveguide set comprises a second out-coupling multiplexed chromatic volume holographic grating, a second waveguide plate and an array of non-polarizing splitting films, as shown in fig. 2.

The positive first order diffracted light transmitted in the opposite direction to the environment will then be re-coupled into the second waveguide plate by the second outcoupling multiplexed color volume holographic grating. Since the first coupling-out multiplexed color volume holographic grating and the second coupling-out multiplexed color volume holographic grating are two identical multiplexed color volume holographic gratings, the incident angle of the coupled-in light satisfies the total reflection condition. The coupled light can be transmitted forwards to the third coupling-out multiplexing color volume holographic grating or the non-polarization light splitting film array at the coupling-out end in a total reflection mode in the second waveguide plate, and finally the light is diffracted by the third coupling-out multiplexing color volume holographic grating at the coupling-out end or reflected and output by the non-polarization light splitting film array, so that the part of light can be avoided from the range of human eyes, and the concealment of the augmented reality near-eye display device is enhanced.

It is further understood that the use of "a plurality" in this disclosure means two or more, as other terms are analogous. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. The singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It will be further understood that the terms "first," "second," and the like are used to describe various information and that such information should not be limited by these terms. These terms are only used to distinguish one type of information from another and do not denote a particular order or importance. Indeed, the terms "first," "second," and the like are fully interchangeable. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure.

It is further to be understood that while operations are depicted in the drawings in a particular order, this is not to be understood as requiring that such operations be performed in the particular order shown or in serial order, or that all illustrated operations be performed, to achieve desirable results. In certain environments, multitasking and parallel processing may be advantageous.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (8)

1. An augmented reality near-eye display device, the device comprising: the optical-mechanical system comprises an optical-mechanical system, a first waveguide group and a second waveguide group, wherein the second waveguide group and the first waveguide group are arranged in parallel, and two ends of the second waveguide group are connected to the lower surfaces of two ends of the first waveguide group through frame glue;

the optical-mechanical system is used for emitting light rays to the coupling-in area of the first waveguide group;

the first waveguide group comprises an incoupling grating, a first waveguide plate and a first outcoupling grating, the light enters the first waveguide plate through the incoupling grating and propagates to the first outcoupling grating in the first waveguide plate in a total reflection manner, the negative first-order diffraction light is coupled out to human eyes through the first outcoupling grating, and the positive first-order diffraction light is coupled out to the second waveguide group;

the second waveguide group comprises a second coupling-out grating, a second waveguide plate and a coupling-out element, wherein the positive first-order diffracted light is coupled into the second waveguide plate again through the second coupling-out grating, propagates to the coupling-out element in the second waveguide plate in a total reflection mode, and is coupled out through the coupling-out element.

2. The augmented reality near-eye display device of claim 1, wherein the out-coupling element comprises a third out-coupling grating.

3. The augmented reality near-eye display device of claim 2, wherein the first out-coupling grating, the second out-coupling grating, and the third out-coupling grating are three identical multiplexed color volume holographic gratings.

4. The augmented reality near-eye display device of claim 1, wherein the out-coupling elements comprise an array of unpolarized splitting films.

5. The augmented reality near-eye display device of claim 1, wherein the incoupling grating and the first outcoupling grating are two multiplexed color volume holographic gratings fabricated in mirror symmetry, and the second outcoupling grating and the first outcoupling grating are identical.

6. The augmented reality near-eye display device of claim 3 or 5, wherein the multiplexed color volume holographic grating comprises a reflection volume holographic grating.

7. The augmented reality near-eye display device of claim 3 or 5, wherein the multiplexed color volume holographic grating is fabricated based on an angle multiplexing or wavelength multiplexing technique.

8. The augmented reality near-to-eye display device of claim 1, wherein the opto-mechanical system comprises a micro-display and an optical collimation system;

the micro display is arranged on a main optical axis of the optical alignment system and used for loading and outputting an image;

the optical collimation system is positioned on the light emitting surface of the micro display and used for collimating and correcting the image output by the micro display and then inputting the image into the coupling-in area of the first waveguide group.

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