The present disclosure relates to the optical technology, in particular to a waveguide augmented reality display apparatus.
Augmented reality technology is also referred to as AR. AR augmented reality technology is a relatively new technical solution that promotes the fusion of real world information and virtual world information. It simulates and processes the physical information that is difficult to experience in the real world space by using computers and other scientific technologies, and superimposes the virtual information content in the real world, which may be perceived by human senses in this process, thus realizing a sensory experience beyond reality. After the real environment and virtual objects overlap, they may exist in the same picture and space at the same time. Augmented reality display technology may superimpose virtual images into the real world to achieve the purpose of fusing virtual information with the real world. Augmented reality display technology can enhance the information expressed in the real world, so it has broad application prospects in education, remote cooperation, traffic navigation and other fields. The waveguide-based augmented reality display apparatus has the advantages of compact structure, small size and easy for the exit pupil to expand, and has been used in products by Microsoft, Sony, Magicleap and other companies.
Due to the limitation of total reflection condition of waveguide, the field of view of waveguide-based augmented reality display apparatus is generally small. The traditional waveguide augmented reality display apparatus is usually provided with two waveguides, one waveguide is used to transmit a light beam generated by an image source according to image data of a left half of a displayed image, and the other waveguide is used to transmit a light beam generated by an image source according to image data of a right half of the displayed image, so as to enhance the field of view. However, the dual-waveguide configuration increases the thickness and weight of the waveguide augmented reality display apparatus, which greatly reduces the user experience of the waveguide augmented reality display apparatus.
Therefore, it is necessary to provide a waveguide augmented reality display apparatus which may increase a field of view and has a compact structure.
A waveguide augmented reality display apparatus, includes:
an image source, configured to display an image and generate a first light beam and a second light beam with different optical properties according to data of the displayed image;
a single waveguide spaced from the image source;
a first in-coupling device, arranged on one side of the waveguide adjacent to the image source, and configured to couple the first light beam into the waveguide;
a second in-coupling device, arranged on one side of the waveguide away from the image source, and configured to couple the second light beam into the waveguide, wherein both the first light beam and the second light beam are originated from a light beam generated by the image source according to the data of a same displayed image; and
an out-coupling device, arranged on the waveguide, and configured to couple out the first light beam and the second light beam propagating in the waveguide in a same preset area; wherein an out-coupling grating vector of the first light beam and an out-coupling grating vector of the second light beam are the same.
In one embodiment, the first light beam is a light beam of a first polarization state, the second light beam is a light beam of a second polarization state, the waveguide augmented reality display apparatus further includes a first polarizer and a second polarizer, and the first polarizer and the second polarizer are configured to screen the light beam to obtain a light beam of the first polarization state and a light beam of the second polarization state respectively.
In one embodiment, the light beam of the first polarization state and the light beam of the second polarization state are a light beam of an S polarization state and a light beam of a P polarization state, or a light beam of a left-handed circular polarization state and a light beam of a right-handed circular polarization state, respectively.
In one embodiment, the first polarizer and the second polarizer are arranged in parallel on one side of the image source adjacent to the waveguide, and an orthographic projection of the first polarizer and an orthographic projection of the second polarizer on the image source do not overlap with each other.
In one embodiment, the first light beam is a light beam incident at a positive angle and the second light beam is a light beam incident at a negative angle.
In one embodiment, the first in-coupling device and the second in-coupling device are arranged on opposite sides of the waveguide and are aligned coaxially with an optical axis.
In one embodiment, the out-coupling device includes:
a first out-coupling device, arranged on one side of the waveguide adjacent to the image source, and the first out-coupling device being configured to couple out the first light beam propagating in the waveguide; and
a second out-coupling device, arranged on one side of the waveguide away from the first out-coupling device, and the second out-coupling device being configured to couple out the second light beam propagating in the waveguide.
In one embodiment, the first in-coupling device and the first out-coupling device are transmission gratings, and the second in-coupling device and the second out-coupling device are reflection gratings; the first light beam is coupled into the waveguide through the first in-coupling device, totally reflected in the waveguide and transmitted to the first out-coupling device, and then coupled out by the first out-coupling device; and the second light beam is coupled into the waveguide through the second in-coupling device, totally reflected in the waveguide and transmitted to the second out-coupling device, and then coupled out to the preset area through the second out-coupling device and the first out-coupling device sequentially.
In one embodiment, the first out-coupling device and the second out-coupling device are arranged on opposite sides of the waveguide and are aligned coaxially with an optical axis.
In one embodiment, the out-coupling grating vector of the first light beam is the same as the out-coupling grating vector of the second light beam and has the same polarization selectivity. The out-coupling device is a transmission grating arranged on one side of the waveguide, and the single out-coupling device is arranged on either side in a thickness direction of the waveguide.
In the above waveguide augmented reality display apparatus, the single waveguide is spaced from the image source. Since the first in-coupling device and the second in-coupling device respectively arranged on both sides of the single waveguide may only diffract the first beam and the second beam generated by the image source according to the data of the displayed image, the first beam and the second beam generated by the image source may be coupled into the waveguide through the first in-coupling device and the second in-coupling device respectively. Then, the first light beam and the second light beam propagating in the waveguide are coupled out in the same preset area through the out-coupling device arranged on the waveguide, so that the above waveguide augmented reality display apparatus can realize superposition and doubling of two different fields of view composed of the first light beam and the second light beam through the single waveguide. Compared with the traditional waveguide augmented reality display apparatus with dual-waveguide, the present solution can significantly increase the field of view on the premise of ensuring the compact structure of the waveguide augmented reality display apparatus, which is conducive to improving the user experience.
The present disclosure will be further illustrated with reference to the accompanying drawings and embodiments.
As shown in
Specifically, for convenience of description, the corresponding grating vectors of the light beams in the in-coupling device 11, the deflector 12 and the out-coupling device 13 are respectively denoted as K1, K2 and K3, and the corresponding propagation periods of the light beams in the in-coupling device 11, the deflector 12 and the out-coupling device 13 are respectively denoted as Λ1, Λ2 and Λ3. The direction of the grating vector is parallel to a corresponding grating period direction;
The magnitude of K1: |K1|=2π/Λ1;
The magnitude of K2: |K2|=2π/Λ2; and
The magnitude of K3: |K3|=2π/Λ3.
As shown in
As shown in
The image source 100 is configured to display an image and simultaneously generate a first light beam and a second light beam with different optical properties according to data of the displayed image. The waveguide 200 is spaced from the image source 100, and there is one waveguide 200. The first in-coupling device 300 is arranged on one side of the waveguide 200 adjacent to the image source 100. The first in-coupling device 300 is preferably a transmission grating, and is configured to couple the first light beam into the waveguide 200. The second in-coupling device 400 is arranged on the side of the waveguide 200 away from the image source 100. The second in-coupling device 400 is preferably a reflection grating, and is configured to couple the second light beam into the waveguide 200. Both the first light beam and the second light beam originate from a light beam generated by the image source 100 according to the data of the same displayed image. The out-coupling devices 500 and 500′ are arranged on the waveguide 200, and are configured to couple out the first light beam and the second light beam propagating in the waveguide 200 in a same preset area.
As shown in
As shown in
As shown in
In an embodiment, the first light beam is a light beam of a first polarization state, and the second light beam is a light beam of a second polarization state. That is, in the present solution, the light beams generated by the image source 100 according to the data of the displayed image are the light beam of the first polarization state and the light beam of the second polarization state with different polarization states. As shown in
As shown in
Further, in an embodiment, the light beam of the first polarization state and the light beam of the second polarization state are a light beam of an S polarization state and a light beam of a P polarization state, respectively. It can be appreciated that in other embodiments, the light beam of the first polarization state and the light beam of the second polarization state may be a light beam of a left-handed circular polarization state and a light beam of a right-handed circular polarization state, respectively.
As shown in
It can be appreciated that when the out-coupling gratings of the first beam and the second beam have the same polarization selectivity, a single out-coupling device is configured to couple out the first beam and the second beam propagating in the waveguide 200 in the same preset area. Specifically, the single out-coupling device is the transmission grating and is arranged on either side of the waveguide 200 in the thickness direction. In this embodiment, the single out-coupling device is arranged on the side of the waveguide 200 adjacent to the image source 100.
As shown in
Since the first in-coupling device 300 and the second in-coupling device 400 respectively arranged on both sides of the single waveguide 200 have a limited angular bandwidth, they may only respectively diffract the first light beam (the light beam incident at the positive angle) and the second light beam (the light beam incident at the negative angle) generated by the image source 100 according to the data of the displayed image. Therefore, the light beam generated by the image source 100 and incident at the positive angle may be coupled into the waveguide 200 through the first in-coupling device 300 on the side of the single waveguide 200 adjacent to the image source 100, while the light beam generated by the image source 100 and incident at the negative angle may be coupled into the waveguide 200 through the second in-coupling device 400 on the side of the single waveguide 200 away from the image source 100. Finally, the light beam incident at the positive angle and the light beam incident at the negative angle propagating in the waveguide 200 are coupled out in the same preset area by the out-coupling device 500. The out-coupling device 500 has a large angular bandwidth and may couple out the first beam and the second beam at the same time. In this way, the above waveguide augmented reality display apparatus 10 can realize the superposition of two different fields of view composed of the light beam incident at the positive angle and the light beam incident at the negative angle through the single waveguide 200, and significantly increase the field of view on the premise of ensuring the compact structure of the waveguide augmented reality display apparatus 10.
As shown in
As shown in
Specifically, the grating vectors corresponding to the first light beam in the first in-coupling device 300, the deflector and the out-coupling devices 500 and 500′ are respectively a first solid line with arrow 23, a second solid line with arrow 24 and a third solid line with arrow 25 shown in
In the above waveguide augmented reality display apparatus 10, the waveguide 200 is spaced from the image source 100, and the waveguide 200 is a single. Since the first in-coupling device 300 and the second in-coupling device 400 respectively arranged on both sides of the single waveguide 200 may only diffract the first beam and the second beam generated by the image source 100 according to the data of the displayed image, then the first beam and the second beam generated by the image source 100 may be coupled into the waveguide 200 through the first in-coupling device 300 and the second in-coupling device 400 respectively. Then, the first light beam and the second light beam propagating in the waveguide 200 are coupled out in the same preset area through the out-coupling devices 500 and 500′ arranged on the waveguide 200, so that the above waveguide augmented reality display apparatus 10 can realize superposition of two different fields of view composed of the first light beam and the second light beam through the single waveguide 200. Compared with the traditional waveguide augmented reality display apparatus with dual-waveguide, the present solution can significantly increase the field of view on the premise of ensuring the compact structure of the waveguide augmented reality display apparatus 10, which is conducive to improving the user experience.
The above is merely embodiments of the present disclosure. It should be appreciated that, those of ordinary skills in the art may make improvements without departing from the inventive concept of the present disclosure, such improvements, however, fall within the protection scope of the present disclosure.
Number | Date | Country | Kind |
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201910803524.7 | Aug 2019 | CN | national |