CN111474711B - Holographic waveguide display device and augmented reality display apparatus - Google Patents
Holographic waveguide display device and augmented reality display apparatus Download PDFInfo
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
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- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
- G02B2027/0174—Head mounted characterised by optical features holographic
Abstract
The present disclosure relates to a holographic waveguide display device and an augmented reality display apparatus, the holographic waveguide display device including: the optical system comprises an image source, a relay optical system, an incoupling grating, a waveguide group and an outcoupling grating; the image source is used for displaying images; the relay optical system is used for collimating and injecting an image displayed by the image source into the coupling-in grating; the coupling-in grating is used for coupling the emergent light of the relay optical system into the waveguide group; the waveguide group comprises a plurality of waveguide plates which are arranged in a stacked mode, a semi-transparent and semi-reflective film is arranged between different waveguide plates, and the waveguide group is used for transmitting coupled light to the coupling-out grating; the coupling-out grating is used for coupling out the light transmitted to the coupling-out grating. By the technical scheme, the secondary diffraction phenomenon can be eliminated and the discontinuity of the image can be observed at the same time.
Description
Technical Field
The present disclosure relates to the field of augmented reality display technologies, and in particular, to a holographic waveguide display device and an augmented reality display apparatus.
Background
The holographic waveguide combines the total reflection characteristic of the waveguide with the diffraction characteristic of the holographic grating, and can realize large-view-field and large-exit-pupil image output, so that the holographic waveguide is applied to a new generation helmet display system, and has the advantages of more compact overall quality and volume. The holographic waveguide is formed by coupling parallel light with different angle information after passing through an optical system into the waveguide in a diffraction mode, wherein the coupled parallel light periodically propagates forwards in a total reflection mode when a total reflection condition is met, and is diffracted and coupled out when encountering a coupled holographic grating and then enters human eyes for imaging. In order to eliminate chromatic dispersion and to achieve the highest possible diffraction efficiency outcoupling, the outcoupling grating is generally of the same period as the incoupling grating and is mirror-symmetrical. In the holographic waveguide, the transmission periods are different due to different angles of light rays in different fields. In order to reduce the energy loss of the image source, the size of the coupling grating can not be smaller than the size of the exit pupil of the relay lens, but when the size of the coupling grating is larger than the light propagation period, the light can have a secondary diffraction phenomenon. Since the in-coupling grating is typically a high diffraction efficiency grating, the image light energy of this part of the field is almost entirely out-coupled. Then, the image light rays of the corresponding visual field are diffracted secondarily and lost, so that the visual field of the final display image is partially lost, and the information of the display image is incomplete. On the other hand, when the pupil size is smaller than the light transmission period, the light beams output in adjacent periods will be discontinuous during coupling-out, thereby causing the human eye to have a discontinuity phenomenon when viewing an image in the range of the system exit pupil, and forming a pupil gap.
Therefore, in the holographic waveguide, the elimination of the secondary diffraction phenomenon and the discontinuity of the observed image are both considered, and the contradiction that the two phenomena cannot be blended is inevitably formed between the two phenomena.
Disclosure of Invention
To overcome the problems in the related art, the present disclosure provides a holographic waveguide display device and an augmented reality display apparatus to achieve both elimination of a secondary diffraction phenomenon and discontinuity of an observed image.
According to a first aspect of embodiments of the present disclosure, there is provided a holographic waveguide display device including: the optical system comprises an image source, a relay optical system, an incoupling grating, a waveguide group and an outcoupling grating;
the image source is used for displaying images;
the relay optical system is used for collimating and injecting an image displayed by the image source into the coupling-in grating;
the coupling-in grating is used for coupling the emergent light of the relay optical system into the waveguide group;
the waveguide group comprises a plurality of waveguide plates which are arranged in a stacked mode, a semi-transparent and semi-reflective film is arranged between different waveguide plates, and the waveguide group is used for transmitting coupled light to the coupling-out grating;
the coupling-out grating is used for coupling out the light transmitted to the coupling-out grating.
In one embodiment, preferably, the transmission angle of the light ray coupled into the waveguide group in the waveguide group is θ, and θ satisfies the following condition:
Pθ≤Lθ
wherein, PθLight rays with a transmission angle theta are propagated in the waveguide group for one periodTotal distance of (L)θRepresenting the distance between the exit pupils of the light rays at the transmission angle theta after they have been transmitted through the set of waveguides and outcoupled by said outcoupling grating.
In one embodiment, the length of the incoupling grating preferably satisfies the following condition:
Pθup≤Li≤Pθ
wherein, PθupA light ray representing a transmission angle theta is transmitted within the waveguide plate positioned at the uppermost layer of the waveguide group for a first distance, P, of one periodθRepresenting the total distance, L, over which a light ray at a transmission angle theta propagates within the waveguide set for one periodiIndicating the length of the incoupling grating.
In one embodiment, the first and second electrodes are, preferably,
Pθ＝Pθup+Pθd1+....+Pθdn
wherein, PθRepresenting the total distance, P, traveled by a light ray of transmission angle theta for one period within said set of waveguidesθupA light ray representing a transmission angle theta is transmitted within the waveguide plate positioned at the uppermost layer of the waveguide group for a first distance, P, of one periodθd1Light rays representing a transmission angle theta are transmitted within the waveguide plate of the first lower layer of the waveguide group for a period of a second distance, PθdnAnd the light ray with the transmission angle theta is transmitted in the waveguide plate of the nth lower layer in the waveguide group for a third distance of one period.
In one embodiment, the first and second electrodes are, preferably,
Pθup+Pθd1+....+Pθdn＝2duptanθ+2dd1tanθ....+2ddntanθ
wherein d isupRepresenting a first thickness, d, of the uppermost waveguide plated1Second thickness of the waveguide plate representing said first lower layer, ddnRepresenting a third thickness of the nth lower layer waveguide plate.
In one embodiment, preferably, the incoupling grating and the outcoupling grating comprise a transmission/reflection planar holographic grating or a transmission/reflection volume holographic grating.
In one embodiment, preferably, the incoupling grating and the outcoupling grating comprise surface microstructure type gratings.
In one embodiment, preferably, the diffraction efficiency of the incoupling grating is step-type, and the step-type diffraction efficiency distribution of the incoupling grating is determined by a mathematical model of the grating diffraction efficiency distribution.
In one embodiment, preferably, the transflective film has a preset transflective ratio.
According to a second aspect of the embodiments of the present disclosure, there is provided an augmented reality display apparatus including:
a holographic waveguide display according to any of the above first aspects.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
in the embodiment of the invention, a multilayer waveguide form is adopted, and the semi-transparent and semi-reflective film layers with certain transmittance and reflectance are coated between the waveguide plates to expand the pupil size, so that the system can ensure that the light cannot generate the secondary diffraction phenomenon in the coupled grating on the premise of no pupil gap of the coupled grating. On the other hand, the introduction of the multilayer waveguide can cause the light beams incident on the coupled-out grating to have an overlapping region and a non-overlapping region, so that the intensity distribution in the transmission direction in the waveguide is changed in a step mode. The invention designs the coupling-in grating with step type diffraction efficiency distribution on the basis of the determined grating diffraction efficiency distribution mathematical model so as to obtain coupled-out light with uniformly distributed light intensity, so that the light intensity distribution of the exit pupil reaches certain uniformity. The waveguide display system based on the present invention has the property of providing a higher uniformity, continuity and integrity of the overall output image.
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 and 2 are schematic diagrams illustrating the principle of a related art holographic plate optical waveguide.
Fig. 3 is a schematic diagram illustrating a structure of a holographic waveguide display device according to an exemplary embodiment.
FIG. 4 is a parameter and optical path schematic diagram of a holographic waveguide display device shown in accordance with an exemplary embodiment.
FIG. 5 is a parameter and optical path schematic diagram of yet another holographic waveguide display device shown in accordance with an exemplary 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 and 2 are schematic diagrams illustrating the principle of a related art holographic plate optical waveguide. As shown in fig. 1 and fig. 2, after being collimated by the relay optical system, the light carrying the microdisplay image is diffracted by the holographic grating at the incident end and then coupled into the slab optical waveguide, and when the total reflection condition is satisfied, the coupled light can be transmitted forward to the holographic grating area at the coupling-out end in a total reflection manner in the optical waveguide, and then is diffracted and output by the holographic grating at the coupling-out end and then enters the human eye for imaging. If the light is incident again on the incoupling grating after a period of propagation, the light will be diffracted twice and the diffracted light will exit the grating parallel to the corresponding light in the input field. In general, the coupling-in end gratings are high diffraction efficiency gratings, so that the image light energy of the part of the field of view is almost completely lost, the image light of the part of the field of view corresponding to the secondary diffraction is lost, and finally, the part of the field of view of the displayed image is lost, so that the displayed image information is incomplete. Therefore, in order to avoid the secondary diffraction phenomenon of each field light on the coupling grating, the horizontal size of the coupling grating needs to satisfy:
Li≤Min{Pθ}＝Pθmin
but when P isθ≥LiP occurs when light is transmitted in a waveguideθ-LiThe pupil gap of (A) is also bound to be P when viewed by human eyesθ-LiThe image gap of (1). Therefore, in the holographic waveguide, the elimination of the secondary diffraction phenomenon and the discontinuity of the observed image are both considered, and the contradiction that the two phenomena cannot be blended is inevitably formed between the two phenomena.
The invention provides a holographic waveguide display device, which aims to solve the contradiction between the elimination of the secondary diffraction phenomenon and the discontinuity of an observed image in the holographic waveguide.
Fig. 3 is a schematic structural view illustrating a holographic waveguide display device according to an exemplary embodiment, and as shown in fig. 3, the holographic waveguide display device includes: an image source 31, a relay optical system 32, an incoupling grating 33, a waveguide set 34, and an outcoupling grating 35;
the image source 31 for displaying an image.
The relay optics 32 is used to collimate the image displayed by the image source into the incoupling grating.
The coupling-in grating 33 is configured to couple the outgoing light of the relay optical system into the waveguide set.
The waveguide group 34 includes a plurality of stacked waveguide plates (in the figure, 3 waveguide plates are taken as an example), and a transflective film is disposed between different waveguide plates, and the waveguide group is used for transmitting the coupled-in light to the coupling-out grating.
The light-coupling grating 35 is used for coupling out the light transmitted to the light-coupling grating.
In one embodiment, preferably, the transflective film has a preset transflective ratio.
In one embodiment, preferably, as shown in fig. 4, assuming that the transmission angle of the light ray coupled into the waveguide set is θ, θ satisfies the following condition:
Pθ≤Lθ
wherein, PθRepresenting the total distance, L, over which a light ray at a transmission angle theta propagates within the waveguide set for one periodθRepresenting the distance between the exit pupils of the light rays at the transmission angle theta after they have been transmitted through the set of waveguides and outcoupled by said outcoupling grating.
By the above conditions, the gaps between the light pupils of each field of view can be eliminated, the splicing among the discrete pupils is realized, and the requirement of the extended pupil for meeting the exit pupil of the system is formed.
In one embodiment, the length of the incoupling grating preferably satisfies the following condition:
Pθup≤Li≤Pθ
wherein, PθupA light ray representing a transmission angle theta is transmitted within the waveguide plate positioned at the uppermost layer of the waveguide group for a first distance, P, of one periodθRepresenting the total distance, L, over which a light ray at a transmission angle theta propagates within the waveguide set for one periodiIndicating the length of the incoupling grating.
In one embodiment, the first and second electrodes are, preferably,
Pθ＝Pθup+Pθd1+....+Pθdn
wherein, PθRepresenting the total distance, P, traveled by a light ray of transmission angle theta for one period within said set of waveguidesθupA light ray representing a transmission angle theta is transmitted within the waveguide plate positioned at the uppermost layer of the waveguide group for a first distance, P, of one periodθd1Light rays representing a transmission angle theta are transmitted within the waveguide plate of the first lower layer of the waveguide group for a period of a second distance, PθdnAnd the light ray with the transmission angle theta is transmitted in the waveguide plate of the nth lower layer in the waveguide group for a third distance of one period. Where n is the number of waveguides in the waveguide set minus 1.
In one embodiment, the first and second electrodes are, preferably,
Pθup+Pθd1+....+Pθdn＝2duptanθ+2dd1tanθ....+2ddntanθ
wherein d isupRepresenting a first thickness, d, of the uppermost waveguide plated1Second thickness of the waveguide plate representing said first lower layer, ddnRepresenting a third thickness of the nth lower layer waveguide plate.
As can be seen from the above formulae, when P is satisfiedθup≤LiOn the premise of ensuring pupil continuous output, the thickness of the lower layer waveguide is properly selected, so that L can be realizedi≤PθTo eliminate the second diffraction effect. Therefore, on the premise of ensuring the elimination of the secondary diffraction phenomenon, the invention also eliminates the pupil gap of each field ray, realizes the expansion of the pupil and ensures the continuity and the integrity of the final output image.
In one embodiment, preferably, the incoupling grating and the outcoupling grating comprise holographic gratings. The manufacturing principle of the holographic grating is as follows: two beams with specific wave surface shape interfere to form interference fringes with different brightness and darkness on the recording plane, and the interference fringes are recorded by holographic recording medium and processed to obtain holographic grating. The holographic gratings with different purposes can be obtained by adopting different wave surface shapes, and the holographic gratings with different types or different purposes, such as sine and cosine gratings, rectangular gratings, plane gratings, volume gratings and the like can be obtained by adopting different holographic recording media and processing processes. In the embodiment of the present invention, the incoupling grating/outcoupling grating may be a transmission/reflection type planar holographic grating or a transmission/reflection type volume holographic grating.
Of course, in another embodiment, the incoupling grating and the outcoupling grating may also preferably comprise surface microstructure type gratings.
The surface microstructure type grating is a surface relief grating, and is formed by curing photoresist in a nano-imprinting mode. Nanoimprint, the most common method for fabricating polymer structures, uses high resolution electron beams to pattern intricately structured nanostructures on a stamp, and then uses a pre-patterned stamp to deform the polymer material to form a structured pattern on the polymer. In the hot embossing process, the structural pattern is transferred to the polymer softened by heating and then cured by cooling below the glass transition temperature of the polymer, while in the uv embossing process it is cured by uv polymerization. Microcontact printing generally refers to the transfer of ink material onto a patterned metal-based surface followed by an etching process. Nanoimprint technology is a low-cost and fast method of obtaining replicated structures at the nanoscale, which can produce large-scale repetitive patterns of nanopattern structures over large areas, and the resulting high-resolution patterns have excellent uniformity and reproducibility.
On the other hand, the introduction of the multilayer waveguide can lead to overlapping and non-overlapping regions of the light beams incident on the outcoupling grating, so that the intensity distribution in the transmission direction within the waveguide changes in steps. Theoretically, the more the number of layers of the waveguide plate is, the better the output uniformity is, but the waveguide plate in the system is too thick, which brings inconvenience to the actual design. In order to ensure the quality of an output image and enable the light intensity distribution of the whole exit pupil to reach certain uniformity, for this reason, an incoupling grating with step type diffraction efficiency distribution can be designed by determining a grating diffraction efficiency distribution mathematical model so as to obtain the outcoupled light with uniformly distributed light intensity.
In summary, in this embodiment, a multi-layer waveguide is adopted, and a transflective film layer with a certain transmittance and reflectance is coated between waveguide plates to expand the pupil size, so as to ensure that the system can ensure that no secondary diffraction occurs in the coupled grating on the premise that the coupled grating has no pupil gap. On the other hand, the introduction of the multilayer waveguide can cause the light beams incident on the coupled-out grating to have an overlapping region and a non-overlapping region, so that the intensity distribution in the transmission direction in the waveguide is changed in a step mode. The invention designs the coupling-in grating with step type diffraction efficiency distribution on the basis of the determined grating diffraction efficiency distribution mathematical model so as to obtain coupled-out light with uniformly distributed light intensity, so that the light intensity distribution of the exit pupil reaches certain uniformity. The waveguide display system based on the present invention has the property of providing a higher uniformity, continuity and integrity of the overall output image.
For the convenience of understanding the technical solution of the present invention, the following description will take the waveguide group as a two-layer waveguide plate structure as an example.
As shown in fig. 5, in order to avoid the secondary diffraction phenomenon of the light in each field on the incoupling grating, the horizontal size of the incoupling grating needs to satisfy:
Li≤Min{Pθ}＝Pθmin
if P is to be madeθ≤LθAnd then:
obtaining:
because the system adopts the multilayer waveguide plate, the light with the transmission angle theta formed after the diffraction of the holographic grating at the incident end is coupled into the waveguide group, when the total reflection condition is met, the coupled light is transmitted forwards in the waveguide group in a total reflection mode, the light is reflected by the upper surface of the upper waveguide plate and then is downwards incident on the semi-transparent semi-reflective film between the two waveguide plates, part of the light can be upwards reflected to the upper surface of the upper waveguide plate, part of the light is transmitted into the lower waveguide plate and is reflected on the lower surface of the lower waveguide plate, the reflected light enters the upper waveguide plate and is reflected on the upper surface of the upper waveguide plate, and the light is sequentially and repeatedly transmitted forwards.
So that a light ray with a transmission angle theta has a propagation period P in the optical waveguideθComprises the following steps:
thus, P can be satisfiedθup≤LiThat is, L can be realized by properly selecting the thickness of the lower waveguide layer on the premise of ensuring pupil continuous outputi≤PθTo eliminate the second diffraction effect. The system is then on the premise of ensuring the elimination of the secondary diffraction phenomenonMeanwhile, pupil gaps of light rays of each field of view are eliminated, pupil expansion is realized, and continuity and integrity of a final output image are guaranteed.
The technical scheme of the invention shows the pupil expansion of the one-dimensional holographic waveguide, and the two-dimensional expansion process of the holographic waveguide is essentially the combination of two one-dimensional expansion processes, so the technical scheme of the invention can also be used for the pupil expansion of the two-dimensional holographic waveguide, so that the image output by the two-dimensional expansion has uniformity, continuity and integrity.
Based on the same concept, an embodiment of the present disclosure further provides an augmented reality display device, including the holographic waveguide display apparatus in any one of the above technical solutions. The augmented reality display device may be an AR glasses or an AR helmet, or the like.
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 disclosure 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 (6)
1. A holographic waveguide display, comprising: the optical system comprises an image source, a relay optical system, an incoupling grating, a waveguide group and an outcoupling grating;
the image source is used for displaying images;
the relay optical system is used for collimating and injecting an image displayed by the image source into the coupling-in grating;
the coupling-in grating is used for coupling the emergent light of the relay optical system into the waveguide group;
the waveguide group comprises a plurality of waveguide plates which are arranged in a stacked mode, a semi-transparent and semi-reflective film is arranged between different waveguide plates, and the waveguide group is used for transmitting coupled light to the coupling-out grating;
the coupling-out grating is used for coupling out the light transmitted to the coupling-out grating;
the transmission angle of the light rays coupled into the waveguide set in the waveguide set is theta, and then the theta meets the following condition:
Pθ≤Lθ
wherein, PθRepresenting transmission angleThe total distance, L, of one period of light propagation in the waveguide set is thetaθRepresenting the distance between the exit pupils of the light rays with the transmission angle theta after being transmitted by the waveguide group and coupled out by the coupling-out grating;
the length of the incoupling grating satisfies the following condition:
Pθup≤Li≤Pθ
wherein, PθupA light ray representing a transmission angle theta is transmitted within the waveguide plate positioned at the uppermost layer of the waveguide group for a first distance, P, of one periodθRepresenting the total distance, L, over which a light ray at a transmission angle theta propagates within the waveguide set for one periodiRepresents the length of the incoupling grating;
Pθ= Pθup+ Pθd1+…+ Pθdn
wherein, PθRepresenting the total distance, P, traveled by a light ray of transmission angle theta for one period within said set of waveguidesθupA light ray representing a transmission angle theta is transmitted within the waveguide plate positioned at the uppermost layer of the waveguide group for a first distance, P, of one periodθd1Light rays representing a transmission angle theta are transmitted within the waveguide plate of the first lower layer of the waveguide group for a period of a second distance, PθdnA light ray with a transmission angle theta is transmitted for a period of n +1 th distance in the waveguide plate of the nth lower layer in the waveguide group;
Pθup+ Pθd1+…+ Pθdn=2dup tanθ+2d d1 tanθ…+ 2d dn tanθ
wherein d isupRepresenting a first thickness, d, of the uppermost waveguide plate d1Second thickness of the waveguide plate representing said first lower layer, d dnRepresents the n +1 th thickness of the nth lower layer waveguide plate;
because the multilayer waveguide plate is adopted, light rays with a transmission angle theta formed after being diffracted by the coupled grating are coupled into the waveguide group and then are transmitted forwards in a total reflection mode in the waveguide group when the total reflection condition is met, the light rays are reflected by the upper surface of the upper waveguide plate and then are transmitted downwards to the semi-transparent semi-reflective film between the two waveguide plates, then the light rays are partially reflected upwards to the upper surface of the upper waveguide plate, partially transmitted to the lower waveguide plate and reflected on the lower surface of the lower waveguide plate, the reflected light rays enter the upper waveguide plate and are reflected on the upper surface of the upper waveguide plate, and the reflected light rays are sequentially transmitted forwards repeatedly.
2. The holographic waveguide display of claim 1, in which the incoupling grating and the outcoupling grating comprise a transmission/reflection planar holographic grating or a transmission/reflection volume holographic grating.
3. The holographic waveguide display of claim 1, in which the incoupling grating and the outcoupling grating comprise surface microstructure type gratings.
4. The holographic waveguide display of claim 1, in which the diffraction efficiency of the incoupling grating is stepped, the stepped diffraction efficiency distribution of the incoupling grating being determined by a mathematical model of the grating diffraction efficiency distribution.
5. The holographic waveguide display of claim 1, in which the transflective film has a preset transflective ratio.
6. An augmented reality display device, comprising:
the holographic waveguide display of any of claims 1 to 5.
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| EP4206760A4 (en) * | 2020-10-13 | 2024-04-10 | Guangdong Oppo Mobile Telecommunications Corp Ltd | Diffraction grating structure, imaging device, and wearable device |
| CN113022591A (en) * | 2021-03-01 | 2021-06-25 | 谷东科技有限公司 | Vehicle-mounted head-up display device based on augmented reality |
| CN112904482B (en) * | 2021-03-23 | 2023-03-10 | 江西欧迈斯微电子有限公司 | Waveguide grating element, method of manufacturing the same, and display device |
| CN113885119A (en) * | 2021-10-12 | 2022-01-04 | 哈尔滨工业大学（深圳） | Diffraction grating optical waveguide-based under-screen image pickup apparatus, method, and program product |
| CN114217375B (en) * | 2021-12-31 | 2023-08-29 | 珠海莫界科技有限公司 | High-brightness uniformity diffraction optical waveguide device and head-mounted AR display device |
| CN115220236B (en) * | 2022-08-17 | 2024-04-12 | 谷东科技有限公司 | High-light-efficiency binocular holographic waveguide near-eye display device and augmented reality display equipment |
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