CN212111991U - Waveguide AR display device with large field angle - Google Patents
Waveguide AR display device with large field angle Download PDFInfo
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- CN212111991U CN212111991U CN202020964598.7U CN202020964598U CN212111991U CN 212111991 U CN212111991 U CN 212111991U CN 202020964598 U CN202020964598 U CN 202020964598U CN 212111991 U CN212111991 U CN 212111991U
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Abstract
The utility model discloses a waveguide AR display device with big angle of vision, include: a light engine, a waveguide device, an incoupling component and an outcoupling component; the coupling-in component and the coupling-out component are arranged on the waveguide device; a light engine for generating an image of at least two polarization states; a coupling-in component for coupling the image of at least two polarization states produced by the light engine into the waveguide device; the waveguide device is used for carrying out total reflection transmission on the coupled images in at least two polarization states; and the coupling-out assembly comprises coupling-out elements with the same number of polarization states as the images, and is used for coupling out the images of at least two polarization states from the waveguide device respectively to form a spliced field of view. The utility model discloses an image source of two kind at least polarization states of waveguide device transmission is through the image source of two kind at least different polarization states of coupling out respectively of coupling out subassembly again, can form the visual field concatenation effect in the observation space, helps increasing the angle of vision.
Description
Technical Field
The utility model relates to a AR shows technical field, especially relates to a waveguide AR display device with big angle of vision.
Background
In a general waveguide AR scheme, a coupling-in element and a coupling-out element (or an expansion element for expansion of a display area) are required to realize superposition of a display image and a real scene. A common solution is to use gratings for the incoupling, outcoupling and expansion elements.
In the grating waveguide scheme, the final displayed field angle is constrained by several conditions: 1. the larger the refractive index of the waveguide material is, the larger the angle range capable of realizing total reflection is, and the larger the field angle capable of transmitting is; 2. the size of the pupil of the human eye, the angle of image transmission should be less than a certain value in order to prevent loss of the image into the pupil; 3. the operating angular bandwidth of the grating, for angles close to the field of view boundary, may reduce the diffraction efficiency of the grating, which may cause problems in the display of the image edges, as shown in fig. 1, typically the angle a at which transmission is possible is about 40 °.
Accordingly, the prior art is deficient and needs improvement.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough of prior art, increase the angle of vision, provide a waveguide AR display device with big angle of vision.
The technical scheme of the utility model as follows: the utility model provides a waveguide AR display device with big angle of vision, include: a light engine, a waveguide device, an incoupling component and an outcoupling component; the coupling-in component and the coupling-out component are arranged on the waveguide device;
the light engine is used for generating images of at least two polarization states; the coupling-in component is used for coupling the images of the at least two polarization states generated by the light engine into the waveguide device, and the coupling-in component is a transmission type coupling-in component or a reflection type coupling-in component; the waveguide device is used for carrying out total reflection transmission on the coupled images in the at least two polarization states; the coupling-out assembly comprises coupling-out elements with the same number of polarization states as the images, the coupling-out elements are arranged in close proximity, and the coupling-out assembly is used for coupling out the images of the at least two polarization states from the waveguide device respectively to form a spliced field of view.
Further, the incoupling component comprises an incoupling grating; the outcoupling element includes an outcoupling grating, and the outcoupling grating is a polarization-sensitive grating.
Further, the light engine includes: the LCoS chip respectively reflects images with different polarization states, and then the images reach the coupling-in component through the polarization beam splitter.
Alternatively, the light engine comprises: the image source is used for providing at least two images, and the polarization modulation device is used for converting the at least two images provided by the image source into images in different polarization states respectively.
Further, the polarization modulation device is a polarization rotator.
Further, the coupling-in grating is a transmission grating or a reflection grating, and the coupling-out grating is a transmission grating or a reflection grating.
Further, the waveguide device comprises 1 waveguide sheet, and the incoupling grating is a polarization-sensitive grating or a non-polarization-sensitive grating.
Or, the waveguide device comprises waveguide sheets with the same number of polarization states as the image, and the in-coupling grating comprises polarization sensitive gratings with the same number of polarization states as the image.
Further, the waveguide layers with the same number of polarization states as the image are stacked; the coupling-in gratings with the same number as the polarization states of the images are arranged on the corresponding waveguide sheets and used for coupling the images of at least two polarization states generated by the light engine into the corresponding waveguide sheets respectively, and the coupling-out gratings with the same number as the polarization states of the images are arranged on the corresponding waveguide sheets and used for coupling out the images of at least two polarization states respectively.
Further, the light engine is used for generating images of two polarization states, including an image of a P polarization state and an image of an S polarization state.
Adopt above-mentioned scheme, the utility model discloses an image source of two kinds at least polarization states is transmitted to the waveguide device, and the image source of two kinds at least different polarization states is outcoupled respectively through the outcoupling subassembly again to can form the visual field concatenation effect in the observation space, and then reach the purpose of increase AR display device's the angle of vision.
Drawings
Fig. 1 is a schematic diagram of image transmission of a grating waveguide in the prior art.
Fig. 2 is a schematic structural diagram of the present invention.
Fig. 3 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a second embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a third embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 2, in the present invention, a waveguide AR display device with a large viewing angle includes: light engine 100, waveguide device 200, incoupling component 300 and outcoupling component 400; the incoupling component 300 and the outcoupling component 400 are both arranged on the waveguide device. The light engine 100 is used for generating images of at least two polarization states; the incoupling component 300 is used for incoupling the images of the at least two polarization states generated by the light engine 100 into the waveguide device 200, and the incoupling component 300 is a transmissive incoupling component or a reflective incoupling component; the waveguide device 200 is used for carrying out total reflection transmission on the coupled images in the at least two polarization states; the coupling-out assembly 400 includes coupling-out elements with the same number of polarization states as that of the image, the coupling-out elements are arranged in close proximity, and the coupling-out assembly 400 is used for coupling out the images of the at least two polarization states from the waveguide device 200 respectively to form a spliced field of view.
In this scheme, the light engine 100 may be in the form of an LCoS module, an LCD module, an OLED module, a Micro LED module, or the like, as long as it can generate images in at least two polarization states; the incoupling component 300 only needs to couple the image of at least two polarization states generated by the light engine 100 into the waveguide device 200, and the incoupling component 300 may include an incoupling grating, which specifically may include a polarization-sensitive grating or a non-polarization-sensitive grating, such as an embossed grating or a holographic grating, and the presentation form of the incoupling grating may be transmissive or reflective; the waveguide device 200 is only required to realize total reflection transmission of the coupled-in image; the outcoupling module 400 only needs to be capable of outcoupling at least two polarization state images in the waveguide device 200 to form a spliced field of view. In particular implementations, the out-coupling assembly 400 may include: the coupling-out gratings with the same number of polarization states as the images specifically adopt polarization-sensitive gratings with the same number of polarization-state images, such as holographic gratings or embossed gratings with polarization sensitivity.
In the present scheme, the light engine 100 provides images of at least two polarization states, the image of at least two polarization states is coupled into the waveguide device 200 through the coupling-in component 300 for total reflection transmission, in the waveguide transmission, the image of each polarization state respectively satisfies the above-mentioned field angle constraint, at the coupling-out end, the coupling-out component 400 can couple out the images of different polarization states at different angles, and splicing of the field of view is realized during coupling-out, thereby achieving the effect of increasing the field of view.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a first embodiment of the present invention, in this embodiment, the number of the polarization state images is 2, and the light engine provides two images with different polarization states and adopts a polarization beam splitting manner, and in this embodiment, the light engine specifically includes a light source 11, a first LCoS chip 13, a second LCoS chip 14, and a polarization beam splitter 12. Light generated by the light source 11 passes through the polarization beam splitter 12 and respectively reaches the first LCoS chip 13 and the second LCoS chip 14, and the first LCoS chip 13 and the second LCoS chip 14 respectively reflect to generate images in two polarization states, and then reach the coupling-in component 3a through the polarization beam splitter 14. The waveguide device 2a is a waveguide plate in this embodiment, the coupling-in component 3a is disposed at one end of the waveguide plate, and the coupling-out component 4a is disposed at the other end of the waveguide plate. The incoupling component 3a may be a non-polarization sensitive grating that acts on images of two polarization states simultaneously; the image of the corresponding polarization state can also be coupled in by two different gratings, such as polarization sensitive gratings. The presentation form of the incoupling grating may be a holographic grating or an embossed grating. The coupling-out component 4a is two coupling-out gratings, specifically two polarization sensitive gratings, the coupling-in component 3a couples images of two polarization states into the waveguide device 2a for transmission, and then the coupling-out component 4a couples images of two polarization states to form a field splicing effect in an observation space, so that the field angle is increased, the two coupling-out gratings of the coupling-out component 2 are arranged next to each other, seamless connection is realized, a displayed image achieves the effect of seamless splicing, and user experience is improved.
Referring to fig. 4, the present invention further provides a second embodiment, which is different from the first embodiment in that the optical engine adopts a time division multiplexing mode, specifically including: an image source 15 and a polarization modulation device. In this embodiment, the polarization modulation device is a polarization rotator 16. The image source 15 provides two images in a high frame rate, two ends of the polarization rotating wheel 16 are respectively two polarizing films with different polarization states, the polarization rotating wheel 16 rotates to modulate the two images, and the rotation frequency of the polarization rotating wheel 16 is consistent with the frequency of the two images with different polarization states provided by the image source 15 in a switching mode, so that one image is in one polarization state, and the other image is in the other polarization state. The specific principle of the two polarization images being coupled into the waveguide device 2b via the coupling-in component 3b and finally coupled out via the coupling-out component 4b is the same as that of the first embodiment, and is not repeated here.
In the two embodiments, the waveguide device 2 is a waveguide sheet, and the waveguide sheet is used for transmitting images of two polarization states at the same time, so that the display effect can be improved as much as possible under a smaller thickness of the lens, and when only one coupling grating serving as a coupling device is used, the waveguide sheet has an effect on both polarization states, and the images of both polarization states can be coupled into the waveguide sheet for total reflection transmission. The coupling grating can be selected as an embossed grating or a holographic grating.
Referring to fig. 5, a third embodiment is also provided, in which the light engine 100a provides images of two polarization states, the waveguide device includes a first waveguide sheet 21 and a second waveguide sheet 22 arranged in a stacked manner, the coupling-in component includes a first coupling-in grating 31 and a second coupling-out grating 32, and the coupling-out component includes a first coupling-out grating 41 and a second coupling-out grating 42. The first incoupling grating 31, the second incoupling grating 32, the first outcoupling grating 41 and the second outcoupling grating 42 are all polarization-sensitive gratings. The first coupling grating 31 and the first coupling grating 41 are both disposed on the first waveguide sheet 21, and are respectively disposed at two ends of the first waveguide sheet 21, and are disposed on one side of the first waveguide sheet 21 close to the human eye; the second incoupling grating 32 and the second outcoupling grating 42 are both disposed on the second waveguide sheet 22, and are respectively disposed at two ends of the second waveguide sheet 22, and are disposed on one side of the first waveguide sheet 21 close to the human eye; the projections of the two outcoupling gratings on the side close to the human eye are arranged next to one another. The first coupling-in grating 31 is configured to couple one of two polarization state images into the first waveguide 21, the second coupling-in grating 32 is configured to couple the other one of the other polarization state images into the second waveguide 22, the first waveguide 21 and the second waveguide 22 are respectively configured to transmit the corresponding one of the polarization state images by total reflection, and the first coupling-out grating 41 and the second coupling-out grating 42 are respectively configured to couple out the images in the corresponding waveguides and form a spliced view field. The scheme can realize that two channels respectively transmit images in two polarization states. With the structure of the two waveguide pieces of the present embodiment, the angle of view can be further increased.
Referring to fig. 6, a fourth embodiment of the present invention is further provided, in which the light engine 100b provides images with three different polarization states, the coupling-in component includes a first coupling-in grating 33, a second coupling-in grating 34 and a third coupling-in grating 35, the coupling-out component includes a first coupling-out grating 43, a second coupling-out grating 44 and a third coupling-out grating 45, and the coupling-in grating and the coupling-out grating are both polarization-sensitive gratings and only function corresponding to one polarization state. The waveguide device comprises a first waveguide sheet 23, a second waveguide sheet 24 and a third waveguide sheet 25 which are arranged in a stacked mode, a first coupling grating 33 and a first coupling grating 43 are arranged on the first waveguide sheet 23, a second coupling grating 34 and a second coupling grating 44 are arranged on the second waveguide sheet 24, a third coupling grating 35 and a third coupling grating 25 are arranged on the third waveguide sheet 25, the first coupling grating 43, the second coupling grating 44 and the third coupling grating 45 are arranged in a mode of being close to the projection on the side of human eyes, each coupling grating couples an image of a polarization state into a corresponding waveguide sheet respectively, and the coupling gratings are coupled out through the corresponding coupling gratings after the waveguide sheets are transmitted to form a spliced view field. In this embodiment, three images with different polarization states can be transmitted through three channels respectively.
In the third and fourth embodiments provided above, the light engine may provide images in polarization states in a polarization beam splitting manner or a time division multiplexing manner.
In addition, the waveguide sheet of the present invention can be made of glass or resin. The coupling-out gratings are all made of polarization sensitive materials, and one coupling-out grating only acts corresponding to one polarization state.
It is worth mentioning that the coupling grating in the present invention can be selected as a transmission grating, and the coupling grating is located on the waveguide sheet at this time, on the side closer to the human eye, or the coupling grating can be selected as a reflection grating, on the waveguide sheet on the side relatively far away from the human eye; or the coupling-out grating can also adopt a reflection grating, and the coupling-out grating is positioned on one side of the waveguide chip relatively far away from human eyes, or the coupling-out grating can also adopt a transmission grating, and the coupling-out grating is positioned on one side of the waveguide chip closer to the human eyes. It is understood that when the coupling grating is a transmissive grating, the coupling grating may be a reflective grating or a transmissive grating; when the coupling grating is a reflective grating, the coupling grating can be a reflective grating or a transmissive grating; the utility model discloses in, when the quantity of the polarization state image that the light engine provided was 2, these two kinds of polarization state images can be P polarization state image and S polarization state image respectively.
To sum up, the utility model discloses an image source of two kinds at least polarization states is transmitted to the waveguide device, and the image source of two kinds at least different polarization states is coupled out respectively through the coupling-out subassembly again, can form the visual field concatenation effect in the observation space, helps increasing the angle of vision.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A waveguide AR display device with a large field angle, comprising: a light engine, a waveguide device, an incoupling component and an outcoupling component; the coupling-in component and the coupling-out component are arranged on the waveguide device;
the light engine is used for generating images of at least two polarization states; the coupling-in component is used for coupling the images of the at least two polarization states generated by the light engine into the waveguide device, and the coupling-in component is a transmission type coupling-in component or a reflection type coupling-in component; the waveguide device is used for carrying out total reflection transmission on the coupled images in the at least two polarization states; the coupling-out assembly comprises coupling-out elements with the same number of polarization states as the images, the coupling-out elements are arranged in close proximity, and the coupling-out assembly is used for coupling out the images of the at least two polarization states from the waveguide device respectively to form a spliced field of view.
2. The waveguide AR display device with a large field angle of claim 1, wherein the incoupling component includes an incoupling grating; the outcoupling element includes an outcoupling grating, and the outcoupling grating is a polarization-sensitive grating.
3. The waveguide AR display device with large field angle of claim 2, wherein the light engine comprises: the LCoS chip respectively reflects images with different polarization states, and then the images reach the coupling-in component through the polarization beam splitter.
4. The waveguide AR display device with large field angle of claim 2, wherein the light engine comprises: the image source is used for providing at least two images, and the polarization modulation device is used for converting the at least two images provided by the image source into images in different polarization states respectively.
5. The waveguide AR display device with large field angle of claim 4, wherein the polarization modulation device is a polarization rotator.
6. The waveguide AR display device with a large field angle according to claim 2, wherein the incoupling grating is a transmissive grating or a reflective grating and the outcoupling grating is a transmissive grating or a reflective grating.
7. The waveguide AR display device with a large field angle according to any one of claims 2 to 6, wherein the waveguide device includes 1 waveguide plate, and the incoupling grating is a polarization-sensitive grating or a non-polarization-sensitive grating.
8. The waveguide AR display device with large field angle of claims 2 to 6, wherein the waveguide device comprises the same number of waveguide pieces as the image polarization states, and the incoupling grating comprises the same number of polarization sensitive gratings as the image polarization states.
9. The waveguide AR display device with a large field angle according to claim 8, wherein the same number of waveguide layers as the number of image polarization states are stacked; the coupling-in gratings with the same number as the polarization states of the images are arranged on the corresponding waveguide sheets and used for respectively coupling the images of at least two polarization states generated by the light engine into the corresponding waveguide sheets, and the coupling-out gratings with the same number as the polarization states of the images are respectively arranged on the corresponding waveguide sheets and used for respectively coupling out the images of at least two polarization states.
10. The waveguide AR display device with a large field angle of any one of claims 1 to 6, wherein the light engine is configured to generate images of two polarization states, including an image of a P polarization state and an image of an S polarization state.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020964598.7U CN212111991U (en) | 2020-05-29 | 2020-05-29 | Waveguide AR display device with large field angle |
| PCT/CN2021/090574 WO2021238560A1 (en) | 2020-05-29 | 2021-04-28 | Waveguide ar display device having large field angle, and implementation method therefor |
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| CN202020964598.7U CN212111991U (en) | 2020-05-29 | 2020-05-29 | Waveguide AR display device with large field angle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021238560A1 (en) * | 2020-05-29 | 2021-12-02 | 深圳惠牛科技有限公司 | Waveguide ar display device having large field angle, and implementation method therefor |
| WO2023130806A1 (en) * | 2022-01-04 | 2023-07-13 | 南昌虚拟现实研究院股份有限公司 | Diffractive optical waveguide display device |
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- 2020-05-29 CN CN202020964598.7U patent/CN212111991U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021238560A1 (en) * | 2020-05-29 | 2021-12-02 | 深圳惠牛科技有限公司 | Waveguide ar display device having large field angle, and implementation method therefor |
| WO2023130806A1 (en) * | 2022-01-04 | 2023-07-13 | 南昌虚拟现实研究院股份有限公司 | Diffractive optical waveguide display device |
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