CN110927975A - A waveguide display system, augmented reality glasses - Google Patents
A waveguide display system, augmented reality glassesDownload PDFInfo
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- CN110927975A CN110927975ACN201911321903.9ACN201911321903ACN110927975ACN 110927975 ACN110927975 ACN 110927975ACN 201911321903 ACN201911321903 ACN 201911321903ACN 110927975 ACN110927975 ACN 110927975A
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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
- 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
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0123—Head-up displays characterised by optical features comprising devices increasing the field of view
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- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
Translated fromChinese
Description
Technical Field
The present disclosure relates to the field of optics, and in particular, to a waveguide display system and augmented reality glasses.
Background
The waveguide is a structure for directionally guiding electromagnetic waves, and can enable light rays incident into the waveguide to propagate along the waveguide; the diffractive optical element can change the propagation direction of light by diffraction. The diffraction waveguide display system composed of the waveguide and the diffraction optical element realizes off-axis transmission of light, and becomes an effective solution of an Augmented Reality (AR) technology and a Virtual Reality (VR) technology.
However, the conventional diffractive waveguide display system has a complicated structure, a heavy weight and a high cost, and cannot achieve a light and thin volume while ensuring a large viewing angle field.
Disclosure of Invention
To solve at least one of the above problems of the prior art, the present application provides a waveguide display system and augmented reality glasses.
As a first aspect of the present application, there is provided a waveguide display system comprising a micro-display, a waveguide, a diffractive optical element;
the micro display is used for emitting display light carrying display content;
the input end of the waveguide has an angled end face, the central axis of the microdisplay is perpendicular to the angled end face, and the angled end face makes a predetermined angle with the surface of the waveguide, so that the display light incident into the waveguide propagates along the waveguide according to a predetermined path;
the diffractive optical element is a gradient diffractive optical element, is located at the output end of the waveguide, and is used for modulating the display light transmitted in the waveguide and coupling out the waveguide.
Optionally, the microdisplay is disposed proximate to the angled end face.
Optionally, the predetermined angle is a first predetermined angle, so that the display light incident into the waveguide perpendicular to the inclined end face can be totally reflected on the surface of the waveguide.
Optionally, the waveguide comprises an antireflective film overlying the surface;
the reflection increasing film is used for increasing the reflection energy of the display light when the display light is reflected on the surface of the waveguide.
Optionally, the predetermined angle is a second predetermined angle so that the display light incident into the waveguide perpendicularly to the inclined end face is directly irradiated onto the diffractive optical element through the waveguide.
Optionally, the diffractive optical element is a graded grating.
Optionally, the diffractive optical element is a transmissive diffractive optical element or a reflective diffractive optical element.
As a second aspect of the present application, there is provided augmented reality glasses comprising the waveguide display system described above.
According to the waveguide display system, the inclined end face is arranged at the input end of the waveguide, so that display light entering the waveguide can be transmitted according to a preset path, meanwhile, the gradual-change diffraction optical element is adopted at the output end of the waveguide, the display light can be modulated and coupled out from the waveguide, and meanwhile, a large field angle is achieved. The waveguide display system does not need a collimation system to collimate display light, does not need a coupling input diffraction element, reduces the complexity of the waveguide display system, reduces the weight, saves the manufacturing cost, and can obtain a large field angle and simultaneously enable the waveguide display system to have a light, thin and compact structure.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application and not to limit the application. In the drawings:
FIG. 1 is a schematic diagram of the structure of one embodiment of a waveguide display system of the present application;
FIG. 2 is a schematic diagram of another embodiment of a waveguide display system according to the present application;
fig. 3 is a schematic structural diagram of yet another embodiment of a waveguide display system in the present application.
Detailed Description
The following detailed description of embodiments of the present application will be made with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present application, are given by way of illustration and explanation only, and are not intended to limit the present application.
It has been found by the present inventors that conventional diffractive waveguide display systems typically require a collimating system in front of the microdisplay to modulate the display light into parallel light that is then incident into the waveguide. The presence of the collimating system increases the complexity and weight of the waveguide display system and also increases the manufacturing cost. If the imaging light beam is not collimated by the relay optical system, the imaging field angle is small due to the relationship between the object distance and the image distance and the limitation of the size of an image source. In order to increase the viewing angle of the display, an imaging system with a larger aperture is usually required, and the focal length of the imaging system with a larger aperture is generally larger, and the corresponding axial thickness is also larger, so that it is not favorable for manufacturing a light, thin and compact display system, that is, the requirements of light, thin and compact structure and large viewing angle cannot be satisfied at the same time. On the other hand, the conventional diffractive waveguide display system generally needs two coupling diffraction elements, namely, two coupling input diffraction elements and two coupling output diffraction elements, and the existence of the two diffraction elements further increases the structural complexity of the waveguide display system and increases the manufacturing cost.
In view of this, as a first aspect of the present embodiment, there is provided a waveguide display system, as shown in fig. 1, including amicrodisplay 1, awaveguide 2, a diffractive optical element 3;
themicro display 1 is used for emitting display light carrying display content;
the input end of thewaveguide 2 has aninclined end face 21, the central axis AA' of themicrodisplay 1 is perpendicular to theinclined end face 21, and theinclined end face 21 makes a predetermined angle with the surface of thewaveguide 2, so that the display light incident into the waveguide propagates along thewaveguide 2 according to a predetermined path;
the diffractive optical element 3 is a gradient diffractive optical element, is located at the output end of thewaveguide 2, and is configured to modulate the display light transmitted in thewaveguide 2 and couple out thewaveguide 2.
In this embodiment, themicro display 1 may be a self-emitting active device, such as a light emitting diode panel, e.g. micro-OLED or micro-LED; or a liquid crystal display panel requiring illumination from an external source, such as a transmissive LCD or a reflective LCOS; but also a digital micromirror array or a laser beam scanner based on micro-electromechanical systems (MEMS) technology. Since different application scenarios may have different requirements on the volume, brightness, resolution, and the like of the microdisplay, in a specific implementation process, a suitable display device may be selected as themicrodisplay 1 according to the application scenarios and the technical requirements. In addition, the polarization states of the display lights emitted by different display devices may be different, and in order to meet the requirements of optical design, a polarizer may be added on the light emitting side of themicrodisplay 1 to change the polarization state of the display light.
In the present embodiment, aninclined end surface 21 is provided at the input end of thewaveguide 2, and theinclined end surface 21 makes a predetermined angle with the surface of thewaveguide 2, so that when light is incident into thewaveguide 2 through theinclined end surface 21, the light can propagate in thewaveguide 2 along a predetermined path. By making the central axis AA' of themicrodisplay 1 perpendicular to theslanted end face 21, the display light emitted by themicrodisplay 1 can propagate along the predetermined path in thewaveguide 2, and the energy loss caused by the reflection of the display light at theslanted end face 21 can be minimized.
In the present embodiment, a graded diffractive optical element is used to modulate the display light propagating in thewaveguide 2 and to couple out thewaveguide 2. The diffractive optical element is an optical element that modulates the amplitude or phase of a light wave by using the diffraction effect, and has high design flexibility. In general, the display light emitted from themicrodisplay 1 is spherical light, but in this embodiment, the display light emitted from themicrodisplay 1 is not collimated before entering thewaveguide 2, and therefore exhibits a periodic characteristic when the display light reaches the diffractive optical element 3 by propagating through thewaveguide 2. In the present embodiment, by utilizing the high design flexibility of the diffractive optical element and combining the periodic characteristics of the display light emitted from themicrodisplay 1, a graded diffractive optical element having a specific period is manufactured as the diffractive optical element 3 in the present embodiment, so that the display light propagating in thewaveguide 2 can be modulated, for example, by modulating to make the divergent incident light exit as convergent, divergent or parallel exit light, so that the exit light enters the human eye and forms an enlarged image, that is, a large field angle is obtained.
It should be noted that the enlarged image formed by the display system of the present invention may be a real image or a virtual image, or may be imaged at infinity.
In the present embodiment, how the diffractive optical element 3 is provided is not particularly limited, and for example, the diffractive optical element 3 may be closely attached to the upper surface of thewaveguide 2 or may be closely attached to the lower surface of thewaveguide 2.
In the present embodiment, theinclined end surface 21 forming a predetermined angle with the surface of thewaveguide 2 is provided so that the incident display light can propagate along a predetermined path in thewaveguide 2, and the diffractive optical element 3 can directly modulate the non-parallel display light and couple out thewaveguide 2, so that the waveguide display system provided in the present embodiment does not require a collimating system to collimate the display light and does not require a coupling-in diffractive element to change the propagation direction of the display light incident in thewaveguide 2.
The waveguide display system according to the present embodiment is configured such that an inclined end surface is provided at an input end of a waveguide to allow display light incident into the waveguide to propagate along a predetermined path, and a gradient diffraction optical element is used at an output end of the waveguide to modulate the display light and couple and output the modulated display light from the waveguide, thereby realizing a large viewing angle. The waveguide display system provided by the embodiment omits a collimation system and a coupling input diffraction element, reduces the complexity of the waveguide display system, lightens the weight, saves the manufacturing cost, and can obtain a large field angle and simultaneously enable the waveguide display system to have a light, thin and compact structure.
In the present embodiment, the positional relationship between themicrodisplay 1 and theinclined end surface 21 is not particularly limited, and the central axis AA' of themicrodisplay 1 may be perpendicular to theinclined end surface 21. Fig. 1 is only exemplary drawn with a distance between themicrodisplay 1 and theangled endface 21. As an alternative embodiment, themicrodisplay 1 is positioned against theslanted end face 21. Furthermore, themicrodisplay 1 may also be positioned a distance away from theslanted end face 21.
As an alternative embodiment, as shown in fig. 2, the predetermined angle between theinclined end face 21 and the surface of thewaveguide 2 is set to a first predetermined angle, so that the display light incident into thewaveguide 2 perpendicular to theinclined end face 21 can be totally reflected on the surface of thewaveguide 2. At this time, the display light incident into thewaveguide 2 may propagate in thewaveguide 2 by multiple total reflections and finally reach the diffractive optical element 3.
When the display light undergoes total reflection several times on the upper and lower surfaces of thewaveguide 2, there is a certain energy loss. In order to reduce the above-mentioned energy loss, when the predetermined angle of theinclined end face 21 with the surface of thewaveguide 2 is set to a first predetermined angle, as shown in fig. 2, reflection increasing films 4 for increasing the reflection energy when the display light is reflected on the surface of the waveguide are further provided on the upper and lower surfaces of thewaveguide 2.
Specifically, in the present embodiment, the reflection increasing film 4 may be provided at a position where the display light is reflected on the upper and lower surfaces of thewaveguide 2.
As an alternative embodiment, as shown in fig. 3, the predetermined angle of theinclined end face 21 with respect to the surface of thewaveguide 2 is set to a second predetermined angle so that the display light incident into thewaveguide 2 perpendicularly to theinclined end face 21 is directly irradiated onto the diffractive optical element 3 through thewaveguide 2.
The specific structure of the diffractive optical element 3 is not particularly limited in the present embodiment, and any diffractive optical element that can modulate non-parallel light and emit divergent incident light as convergent, divergent, or parallel emitted light is within the scope of the present application. As an alternative embodiment, the diffractive optical element 3 is a graded grating. Furthermore, the diffractive optical element 3 may also be a nanostructured surface, a two-dimensional material structure, a micro-or nano-device, or other diffractive element.
Alternatively, in the present embodiment, the diffractive optical element 3 may be a transmissive diffractive optical element or a reflective diffractive optical element. As shown in fig. 3, the diffractive optical element 3 in fig. 3(a) is a reflection type diffractive optical element, and the diffractive optical element 3 in fig. 3(b) is a transmission type diffractive optical element.
The waveguide display system provided in this embodiment mode will be further described with reference to specific examples.
Example one
In this embodiment, as shown in fig. 3(a), theinclined end surface 21 of the input end of thewaveguide 2 forms an acute angle with the upper surface of the waveguide. Themicrodisplay 1 is held against the angled end face 21 of thewaveguide 2. The upper surface of thewaveguide 2 is bonded with a diffractive optical element 3, which is a reflective diffractive optical element. The divergent light beam emitted from themicro display 1 enters thewaveguide 2 directly from the inclined end face 21 of thewaveguide 2 and directly impinges on the diffractive optical element 3. After being modulated by the diffractive optical element 3, the imaging light beam is reflected out of thewaveguide 2 into the human eye to form an enlarged image.
Example two
This embodiment is different from the embodiment in that, as shown in fig. 3(b), themicrodisplay 1 is at a different distance from theinclined end surface 21 of thewaveguide 2, theinclined end surface 21 of thewaveguide 2 forms an obtuse angle with the upper surface, and the diffractive optical element 3 is a transmissive diffractive optical element on the lower surface of thewaveguide 2. The divergent light beam emitted from themicro display 1 enters thewaveguide 2 directly from the inclined end face 21 of thewaveguide 2 and directly impinges on the diffractive optical element 3. After being modulated by the diffractive optical element 3, the imaging light beam exits thewaveguide 2 through the diffractive optical element 3 and enters the human eye to form an enlarged image.
EXAMPLE III
This embodiment is different from the embodiment in that, as shown in fig. 2, the length of thewaveguide 2 is long, and the upper and lower surfaces of thewaveguide 2 are coated with antireflection films 4. The diverging light beam emitted from themicrodisplay 1 enters the waveguide directly from theinclined end surface 21 of thewaveguide 2, and is reflected once or more on the upper and lower surfaces of thewaveguide 2 and enters the diffractive optical element 3 attached to the upper surface of thewaveguide 2. After being modulated by the diffractive optical element 3, the imaging beam is reflected by the diffractive optical element 3 out of thewaveguide 2 into the human eye to form an enlarged image.
As a second aspect of the present embodiment, there is provided augmented reality glasses including the waveguide display system described above.
The principles and advantages of the waveguide display system have been described in detail above and will not be described in detail here.
It is to be understood that the above embodiments are merely exemplary embodiments that are employed to illustrate the principles of the present application, and that the present application is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the application, and these changes and modifications are to be considered as the scope of the application.
Claims (8)
1. A waveguide display system, comprising a micro-display, a waveguide, a diffractive optical element;
the micro display is used for emitting display light carrying display content;
the input end of the waveguide has an angled end face, the central axis of the microdisplay is perpendicular to the angled end face, and the angled end face makes a predetermined angle with the surface of the waveguide, so that the display light incident into the waveguide propagates along the waveguide according to a predetermined path;
the diffractive optical element is a gradient diffractive optical element, is located at the output end of the waveguide, and is used for modulating the display light transmitted in the waveguide and coupling out the waveguide.
2. A waveguide display system as claimed in claim 1 wherein the microdisplays are disposed proximate the angled end face.
3. The waveguide display system according to claim 1, wherein the predetermined angle is a first predetermined angle so that the display light incident into the waveguide perpendicularly to the inclined end face can be totally reflected on a surface of the waveguide.
4. A waveguide display system according to claim 3 wherein the waveguide comprises an antireflection film coated on a surface thereof;
the reflection increasing film is used for increasing the reflection energy of the display light when the display light is reflected on the surface of the waveguide.
5. A waveguide display system according to claim 1 wherein the predetermined angle is a second predetermined angle such that the display light incident into the waveguide normal to the angled end face passes through the waveguide directly onto the diffractive optical element.
6. A waveguide display system as claimed in any one of claims 1 to 5, wherein the diffractive optical element is a graded grating.
7. A waveguide display system according to any one of claims 1 to 5, wherein the diffractive optical element is a transmissive diffractive optical element or a reflective diffractive optical element.
8. Augmented reality glasses comprising a waveguide display system according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911321903.9ACN110927975A (en) | 2019-12-20 | 2019-12-20 | A waveguide display system, augmented reality glasses |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911321903.9ACN110927975A (en) | 2019-12-20 | 2019-12-20 | A waveguide display system, augmented reality glasses |
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| CN110927975Atrue CN110927975A (en) | 2020-03-27 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112130324A (en)* | 2020-09-16 | 2020-12-25 | 谷东科技有限公司 | Near-to-eye display optical coupler and near-to-eye display optical system |
| CN113189779A (en)* | 2021-05-18 | 2021-07-30 | 谷东科技有限公司 | Array optical waveguide module and augmented reality display device |
| CN113917693A (en)* | 2021-09-29 | 2022-01-11 | 歌尔光学科技有限公司 | AR glasses |
| WO2022032985A1 (en)* | 2020-08-13 | 2022-02-17 | 上海慧希电子科技有限公司 | Optical element and system, and optical device |
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| CN107748407A (en)* | 2017-10-25 | 2018-03-02 | 北京理工大学 | A kind of diffraction waveguide display methods and system |
| CN109239926A (en)* | 2018-10-29 | 2019-01-18 | 京东方科技集团股份有限公司 | Display device and its display methods, display equipment |
| CN109839738A (en)* | 2017-11-27 | 2019-06-04 | 北京灵犀微光科技有限公司 | Waveguide display device |
- 2019
- 2019-12-20CNCN201911321903.9Apatent/CN110927975A/enactivePending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107748407A (en)* | 2017-10-25 | 2018-03-02 | 北京理工大学 | A kind of diffraction waveguide display methods and system |
| CN109839738A (en)* | 2017-11-27 | 2019-06-04 | 北京灵犀微光科技有限公司 | Waveguide display device |
| CN109239926A (en)* | 2018-10-29 | 2019-01-18 | 京东方科技集团股份有限公司 | Display device and its display methods, display equipment |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022032985A1 (en)* | 2020-08-13 | 2022-02-17 | 上海慧希电子科技有限公司 | Optical element and system, and optical device |
| CN112130324A (en)* | 2020-09-16 | 2020-12-25 | 谷东科技有限公司 | Near-to-eye display optical coupler and near-to-eye display optical system |
| CN113189779A (en)* | 2021-05-18 | 2021-07-30 | 谷东科技有限公司 | Array optical waveguide module and augmented reality display device |
| CN113189779B (en)* | 2021-05-18 | 2023-10-31 | 谷东科技有限公司 | Array optical waveguide module and augmented reality display device |
| CN113917693A (en)* | 2021-09-29 | 2022-01-11 | 歌尔光学科技有限公司 | AR glasses |
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