CN112711142B - Volume holographic optical waveguide display device and augmented reality display apparatus - Google Patents
Volume holographic optical waveguide display device and augmented reality display apparatus Download PDFInfo
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- CN112711142B CN112711142B CN202110198192.1A CN202110198192A CN112711142B CN 112711142 B CN112711142 B CN 112711142B CN 202110198192 A CN202110198192 A CN 202110198192A CN 112711142 B CN112711142 B CN 112711142B
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- G—PHYSICS
- G02—OPTICS
- 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
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- 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
- G02B27/01—Head-up displays
- 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 volume holographic optical waveguide display device and an augmented reality display apparatus, the volume holographic optical waveguide display device including: an opto-mechanical system, a waveguide system; the optical-mechanical system is used for emitting collimated light to the waveguide system; the waveguide system includes: a plurality of waveguide substrates, and an in-coupling grating and an out-coupling grating corresponding to each waveguide substrate; the coupling grating is arranged in the coupling area of each waveguide substrate and is used for coupling the light emitted by the optical-mechanical system into the waveguide substrate; the waveguide substrate is used for transmitting the light coupled into the waveguide substrate to the coupling-out area in a total reflection mode; the light coupling grating is arranged in the light coupling-out area of each waveguide substrate and is used for coupling out the light transmitted to the light coupling-out area to human eyes; the coupling-in gratings corresponding to different waveguide substrates are obtained by exposing the photosensitive material through light with different parameters, and the coupling-out gratings corresponding to different waveguide substrates are obtained by exposing the photosensitive material through light with different parameters.
Description
The present invention claims priority from chinese patent application CN202010375134.7, and the contents of the specification, drawings and claims of this priority document are incorporated in their entirety into the present specification and are included as part of the original description of the present specification. Applicants further claim that applicants have the right to amend the description and claims of this invention based on this priority document.
Technical Field
The present disclosure relates to the field of augmented reality display technologies, and in particular, to a volume holographic optical waveguide display device and an augmented reality display apparatus.
Background
The augmented reality technology is AR for short, is a new technology for seamlessly integrating real world information and virtual world information, and is characterized in that entity information which is difficult to experience in a certain time space range of the real world originally is simulated and superposed through scientific technologies such as computers, virtual information is applied to the real world and is perceived by human senses, so that the sense experience beyond the reality is achieved, and a real environment and a virtual object are superposed on the same picture or space in real time and exist at the same time. The technology not only shows real world information, but also displays virtual information at the same time, and the two kinds of information are mutually supplemented and superposed. In visual augmented reality, a user can see the real world around it by using a head-mounted display to multiply and combine the real world with computer graphics. The augmented reality technology comprises new technologies and new means such as multimedia, three-dimensional modeling, real-time video display and control, multi-sensor fusion, real-time tracking and registration, scene fusion and the like, and the application of augmented reality is increasingly wider along with the improvement of the operational capability of portable electronic products.
The current augmented reality display device, for the volume holographic optical waveguide display scheme, mainly forms a light and dark stripe by two beams of interference light K1 and K2, and the light and dark stripe exposes a photosensitive material to form a refractive index difference, i.e. to form a grating. However, when the display is performed by the optical waveguide, the range of the visible angle is narrow, and is only near the direction of K1.
Disclosure of Invention
To overcome the problems in the related art, the present disclosure provides a volume holographic optical waveguide display device and an augmented reality display apparatus to achieve an improvement in the maximum viewing angle of a waveguide.
According to a first aspect of embodiments of the present disclosure, there is provided a volume holographic optical waveguide display device comprising: an opto-mechanical system, a waveguide system;
the optical-mechanical system is used for emitting collimated light to the waveguide system;
the waveguide system includes: a waveguide substrate, an incoupling grating and an outcoupling grating;
the coupling-in grating is arranged in a coupling-in area of the waveguide substrate and is used for coupling light rays emitted by the optical-mechanical system into the waveguide substrate, and the coupling-in grating is obtained by exposing photosensitive materials for multiple times through light with different parameters;
the waveguide substrate is used for transmitting the light coupled into the waveguide substrate to the coupling-out area in a total reflection mode;
the coupling-out grating is arranged in a coupling-out area of the waveguide substrate and is used for coupling out light transmitted to the coupling-out area to human eyes, and the coupling-out grating is obtained by exposing a photosensitive material for multiple times through light with different parameters; or
The waveguide system includes: the optical waveguide comprises a plurality of waveguide substrates, an in-coupling grating and an out-coupling grating corresponding to each waveguide substrate, wherein the plurality of waveguide substrates are arranged in a stacked mode;
the coupling grating is arranged in the coupling area of each waveguide substrate and is used for coupling the light emitted by the optical-mechanical system into the waveguide substrate;
the waveguide substrate is used for transmitting the light coupled into the waveguide substrate to the coupling-out area in a total reflection mode;
the light coupling grating is arranged in the coupling-out area of each waveguide substrate and is used for coupling out the light transmitted to the coupling-out area to human eyes;
the coupling-in gratings corresponding to different waveguide substrates are obtained by exposing the photosensitive material through light with different parameters, and the coupling-out gratings corresponding to different waveguide substrates are obtained by exposing the photosensitive material through light with different parameters.
In one embodiment, preferably, when the waveguide system comprises a waveguide substrate, the incoupling grating comprises a grating arranged on one or both sides of an incoupling region of the waveguide substrate.
In one embodiment, preferably, when the waveguide system comprises a waveguide substrate, the outcoupling grating comprises gratings arranged on one or both sides of an outcoupling region of the waveguide substrate.
In one embodiment, preferably, when the waveguide system includes a plurality of waveguide substrates, the incoupling grating includes a grating disposed on one or both sides of an incoupling region of each waveguide substrate.
In one embodiment, preferably, when the waveguide system comprises a plurality of waveguide substrates, the outcoupling grating comprises a grating disposed on one or both sides of the outcoupling region of each waveguide substrate.
In one embodiment, preferably, the incoupling grating and the outcoupling grating comprise volume holographic gratings.
In one embodiment, preferably, the parameter comprises at least one of: angle of incidence and wavelength of incidence.
In one embodiment, the angle θ between the light coupled into the waveguide substrate and the waveguide substrate preferably satisfies the following condition:
θ＞arcsin(n0/n1)
where n1 is the refractive index of the waveguide substrate and n0 is the refractive index of air.
In one embodiment, preferably, the opto-mechanical system comprises: microdisplays and relay optical systems;
the micro display is used for displaying images;
the relay optical system is used for collimating and injecting the image displayed by the micro display into the optical input element.
According to a second aspect of the embodiments of the present disclosure, there is provided an augmented reality display apparatus including:
a volume holographic optical waveguide display device according to any of the first aspects.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
in the embodiment of the invention, the maximum visual angle of the waveguide can be improved by wavelength multiplexing and angle multiplexing of the volume holographic grating.
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 shows an exposure schematic of a prior art volume holographic optical waveguide.
FIG. 2 shows a display schematic of a prior art bulk holographic optical waveguide.
FIG. 3 is a schematic diagram of a volume holographic optical waveguide display device according to an exemplary embodiment.
FIG. 4 is an exposure schematic of a bulk holographic optical waveguide shown in accordance with an exemplary embodiment.
FIG. 5 is a schematic diagram illustrating the structure of yet another volume holographic optical waveguide display device, according to an exemplary embodiment.
FIG. 6 is a schematic diagram illustrating the structure of yet another volume holographic optical waveguide display device, according to an exemplary embodiment.
FIG. 7 is an exposure schematic of yet another bulk holographic optical waveguide substrate 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 shows an exposure schematic of a prior art volume holographic optical waveguide. As shown in fig. 1, the two interference lights K1 and K2 interfere with each other to form a light and dark fringe, and the light and dark fringe exposes the photosensitive material to form a refractive index difference, that is, to form a grating. However, as shown in fig. 2, when the volume hologram optical waveguide is used for optical waveguide display, the visible angle range is narrow, and is only in the vicinity of the K1 direction.
Therefore, in order to solve the above technical solutions, the present application is proposed.
Fig. 3 is a schematic diagram illustrating a structure of a volume holographic optical waveguide display device according to an exemplary embodiment, as shown in fig. 3, the volume holographic optical waveguide display device including: an opto-mechanical system 31, a waveguide system 32;
the optical engine system 31 is configured to emit collimated light to the waveguide system;
the waveguide system 32 includes: a waveguide substrate 321, an incoupling grating 322 and an outcoupling grating 323;
the incoupling grating 322 is disposed on one side or both sides of the incoupling region of the waveguide substrate, and is configured to couple light emitted by the optical-mechanical system into the waveguide substrate. As shown in fig. 4, the incoupling grating 322 is obtained by exposing the photosensitive material multiple times with different parameters of light (two exposures are taken as an example in the figure), where the different parameters of light include: light of different angles and/or different wavelengths.
The waveguide substrate 321 is configured to transmit the light coupled into the waveguide substrate 321 to the coupling-out region in a total reflection manner;
the coupling grating 323 is disposed in a coupling-out region of the waveguide substrate 321, and configured to couple out light transmitted to the coupling-out region to human eyes, where the coupling grating is obtained by exposing a photosensitive material to light with different parameters for multiple times.
In one embodiment, preferably, the incoupling grating and the outcoupling grating comprise volume 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 grating 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 this way, the maximum viewing angle of the waveguide can be increased by angle multiplexing and/or wavelength multiplexing of the volume holographic grating.
In one embodiment, preferably, when the waveguide system comprises a waveguide substrate, the incoupling grating comprises a grating arranged on one or both sides of an incoupling region of the waveguide substrate.
In one embodiment, preferably, when the waveguide system comprises a waveguide substrate, the outcoupling grating comprises gratings arranged on one or both sides of an outcoupling region of the waveguide substrate.
Fig. 3 shows an embodiment in which the incoupling grating and the outcoupling grating are located on one side of the incoupling region and the outcoupling region of the waveguide substrate.
The in-coupling grating 322 and the out-coupling grating 323 may also be located on both sides of the in-coupling region and the out-coupling region of the waveguide substrate 321, as shown in fig. 5. Therefore, the coupled light is diffracted by the coupling-in gratings arranged on the upper surface and the lower surface of the waveguide substrate, the light effect can be improved, and the light coupling-out end is also diffracted by the coupling-out gratings arranged on the upper surface and the lower surface of the waveguide substrate, so that the exit pupil distance of the waveguide is smaller, the light and shade stripes of the displayed image are improved, and the display effect is improved.
In one embodiment, preferably, when the waveguide system includes a plurality of waveguide substrates, the incoupling grating includes a grating disposed on one or both sides of an incoupling region of each waveguide substrate.
In one embodiment, preferably, when the waveguide system comprises a plurality of waveguide substrates, the outcoupling grating comprises a grating disposed on one or both sides of the outcoupling region of each waveguide substrate.
The following describes the present invention in detail by taking an example in which the incoupling grating and the outcoupling grating are disposed on one side of the waveguide substrate.
FIG. 6 is a schematic diagram of another volume holographic optical waveguide display device according to an exemplary embodiment.
As shown in fig. 6, the volume hologram optical waveguide display device includes: an optical-mechanical system 61, a waveguide system 62;
wherein the waveguide system 62 comprises: a plurality of waveguide substrates 621 (two waveguide substrates are taken as an example in the figure, and of course, more waveguide substrates may be stacked), and an incoupling grating 622 and an outcoupling grating 623 corresponding to each waveguide substrate, which are stacked;
the incoupling grating 622 is disposed in an incoupling region of each waveguide substrate 621, and is used for coupling light emitted from the optical-mechanical system into the waveguide substrate 621;
the waveguide substrate 621 is configured to transmit the light coupled into the waveguide substrate 621 to the coupling-out region in a total reflection manner;
the light coupling grating 623 is arranged in the coupling-out region of each waveguide substrate 621 and is used for coupling out the light transmitted to the coupling-out region to human eyes;
as shown in fig. 7, the incoupling gratings corresponding to different waveguide substrates are obtained by exposing the photosensitive material with light of different parameters, and the outcoupling gratings corresponding to different waveguide substrates are obtained by exposing the photosensitive material with light of different parameters.
In one embodiment, preferably, the parameter comprises at least one of: angle of incidence and wavelength of incidence.
In one embodiment, the angle θ between the light coupled into the waveguide substrate and the waveguide substrate preferably satisfies the following condition:
θ＞arcsin(n0/n1)
where n1 is the refractive index of the waveguide substrate and n0 is the refractive index of air.
In one embodiment, preferably, the opto-mechanical system comprises: microdisplays and relay optical systems;
the micro display is used for displaying images;
the relay optical system is used for collimating and injecting the image displayed by the micro display into the optical input element.
Based on the same concept, an embodiment of the present disclosure further provides an augmented reality display device, including the optical 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.
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 volume holographic optical waveguide display device, comprising: an opto-mechanical system, a waveguide system;
the optical-mechanical system is used for emitting collimated light to the waveguide system;
the waveguide system includes: a waveguide substrate, an incoupling grating and an outcoupling grating;
the coupling-in grating is arranged in a coupling-in area of the waveguide substrate and is used for coupling light rays emitted by the optical-mechanical system into the waveguide substrate, and the coupling-in grating is obtained by exposing photosensitive materials for multiple times through light with different parameters;
the waveguide substrate is used for transmitting the light coupled into the waveguide substrate to the coupling-out area in a total reflection mode;
the coupling-out grating is arranged in a coupling-out area of the waveguide substrate and is used for coupling out light transmitted to the coupling-out area to human eyes, and the coupling-out grating is obtained by exposing a photosensitive material for multiple times through light with different parameters; or
The waveguide system includes: the optical waveguide comprises a plurality of waveguide substrates, an in-coupling grating and an out-coupling grating corresponding to each waveguide substrate, wherein the plurality of waveguide substrates are arranged in a stacked mode;
the coupling grating is arranged in the coupling area of each waveguide substrate and is used for coupling the light emitted by the optical-mechanical system into the waveguide substrate;
the waveguide substrate is used for transmitting the light coupled into the waveguide substrate to the coupling-out area in a total reflection mode;
the light coupling grating is arranged in the coupling-out area of each waveguide substrate and is used for coupling out the light transmitted to the coupling-out area to human eyes;
the coupling-in gratings corresponding to different waveguide substrates are obtained by exposing the photosensitive material through light with different parameters, and the coupling-out gratings corresponding to different waveguide substrates are obtained by exposing the photosensitive material through light with different parameters;
when the waveguide system comprises a waveguide substrate, the incoupling gratings comprise gratings disposed on both sides of an incoupling region of the waveguide substrate;
when the waveguide system comprises a waveguide substrate, the outcoupling gratings comprise gratings disposed on both sides of an outcoupling region of the waveguide substrate;
when the waveguide system includes a plurality of waveguide substrates, the incoupling grating includes gratings disposed at one or both sides of an incoupling region of each waveguide substrate;
when the waveguide system comprises a plurality of waveguide substrates, the outcoupling grating comprises gratings disposed on one or both sides of the outcoupling region of each waveguide substrate.
2. A volume holographic optical waveguide display of claim 1, wherein the incoupling grating and the outcoupling grating comprise volume holographic gratings.
3. A volume holographic optical waveguide display according to claim 1, wherein said parameters include at least one of: angle of incidence and wavelength of incidence.
4. A volume holographic optical waveguide display according to claim 1, in which the angle θ between the light coupled into the waveguide substrate and the waveguide substrate satisfies the following condition:
θ＞arcsin(n0/n1)
where n1 is the refractive index of the waveguide substrate and n0 is the refractive index of air.
5. The volume holographic optical waveguide display of any of claims 1 to 4, wherein the opto-mechanical system comprises: microdisplays and relay optical systems;
the micro display is used for displaying images;
the relay optical system is used for collimating and injecting the image displayed by the micro display into the optical input element.
6. An augmented reality display device, comprising:
a volume holographic optical waveguide display device according to any of claims 1 to 5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2020103751347 | 2020-05-05 | ||
| CN202010375134.7A CN111474718A (en) | 2020-05-05 | 2020-05-05 | Volume holographic optical waveguide display device and augmented reality display apparatus |
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| Publication Number | Publication Date |
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| CN112711142A CN112711142A (en) | 2021-04-27 |
| CN112711142B true CN112711142B (en) | 2022-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010375134.7A Withdrawn CN111474718A (en) | 2020-05-05 | 2020-05-05 | Volume holographic optical waveguide display device and augmented reality display apparatus |
| CN202011007342.8A Pending CN111948825A (en) | 2020-05-05 | 2020-09-23 | Volume holographic optical waveguide display device and augmented reality display apparatus |
| CN202110198192.1A Active CN112711142B (en) | 2020-05-05 | 2021-02-22 | Volume holographic optical waveguide display device and augmented reality display apparatus |
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| CN202010375134.7A Withdrawn CN111474718A (en) | 2020-05-05 | 2020-05-05 | Volume holographic optical waveguide display device and augmented reality display apparatus |
| CN202011007342.8A Pending CN111948825A (en) | 2020-05-05 | 2020-09-23 | Volume holographic optical waveguide display device and augmented reality display apparatus |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2763122C1 (en) * | 2020-10-23 | 2021-12-27 | Дмитрий Сергеевич Москалев | Augmented and combined reality screen |
| CN112462521A (en) * | 2020-12-08 | 2021-03-09 | 谷东科技有限公司 | Real-time dynamic three-dimensional display augmented reality near-to-eye display device |
| CN112987306B (en) * | 2021-02-25 | 2023-04-11 | 福州京东方光电科技有限公司 | Augmented reality display device, volume holographic optical waveguide structure and preparation method thereof |
| CN113050285B (en) * | 2021-03-29 | 2022-03-25 | 奥提赞光晶(山东)显示科技有限公司 | Display device, system and display method |
| CN113848648A (en) * | 2021-09-24 | 2021-12-28 | 京东方科技集团股份有限公司 | Optical transmission system and display device |
| CN115202045A (en) * | 2021-09-24 | 2022-10-18 | 无界文化(北京)集团有限公司 | AR display system and method |
| CN114236666B (en) * | 2021-11-30 | 2024-03-29 | 歌尔股份有限公司 | Manufacturing method of glued light guide, performance testing system and electronic equipment |
| CN115616790B (en) * | 2022-12-20 | 2023-04-07 | 煤炭科学研究总院有限公司 | Hologram display system based on volume holographic optical waveguide |
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| CN104777535A (en) * | 2015-03-25 | 2015-07-15 | 东南大学 | Multiplexed volume holographic grating |
| CN107329261A (en) * | 2017-06-08 | 2017-11-07 | 东南大学 | A kind of head mounted display part based on holographical wave guide |
| CN109839738A (en) * | 2017-11-27 | 2019-06-04 | 北京灵犀微光科技有限公司 | Waveguide display device |
| CN110764260A (en) * | 2018-07-28 | 2020-02-07 | 华为技术有限公司 | Augmented reality device |
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| CN101382611B (en) * | 2008-10-10 | 2010-06-30 | 苏州大学 | Method for producing large area holographic grating based on second exposure of reference grating |
| US10509153B2 (en) * | 2016-11-29 | 2019-12-17 | Akonia Holographics Llc | Input coupling |
| EP3361147A1 (en) * | 2017-02-14 | 2018-08-15 | BAE SYSTEMS plc | Waveguide structure |
| CN107966819A (en) * | 2017-12-27 | 2018-04-27 | 北京灵犀微光科技有限公司 | Waveguide display device |
| US20190212589A1 (en) * | 2018-01-08 | 2019-07-11 | Digilens, Inc. | Liquid Crystal Materials and Formulations |
| CN110161701B (en) * | 2019-06-17 | 2021-05-14 | 杭州光粒科技有限公司 | Multi-depth imaging method for polarized light sensitive AR (augmented reality) glasses waveguide |
| CN110806645A (en) * | 2019-11-20 | 2020-02-18 | 深圳惠牛科技有限公司 | Grating waveguide for augmented reality |
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2020
- 2020-05-05 CN CN202010375134.7A patent/CN111474718A/en not_active Withdrawn
- 2020-09-23 CN CN202011007342.8A patent/CN111948825A/en active Pending
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| CN104777535A (en) * | 2015-03-25 | 2015-07-15 | 东南大学 | Multiplexed volume holographic grating |
| CN107329261A (en) * | 2017-06-08 | 2017-11-07 | 东南大学 | A kind of head mounted display part based on holographical wave guide |
| CN109839738A (en) * | 2017-11-27 | 2019-06-04 | 北京灵犀微光科技有限公司 | Waveguide display device |
| CN110764260A (en) * | 2018-07-28 | 2020-02-07 | 华为技术有限公司 | Augmented reality device |
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| CN111948825A (en) | 2020-11-17 |
| CN111474718A (en) | 2020-07-31 |
| CN112711142A (en) | 2021-04-27 |
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