CN112882229A - Augmented reality display system - Google Patents
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- CN112882229A CN112882229A CN201911202085.0A CN201911202085A CN112882229A CN 112882229 A CN112882229 A CN 112882229A CN 201911202085 A CN201911202085 A CN 201911202085A CN 112882229 A CN112882229 A CN 112882229A
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- 230000003190 augmentative effect Effects 0.000 title claims abstract description 37
- 239000000758 substrate Substances 0.000 claims abstract description 52
- 230000003287 optical effect Effects 0.000 claims description 54
- 230000010287 polarization Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 239000011521 glass Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 12
- 238000002834 transmittance Methods 0.000 description 5
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- 238000005516 engineering process Methods 0.000 description 2
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- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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- 239000002184 metal Substances 0.000 description 1
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- 229910052710 silicon Inorganic materials 0.000 description 1
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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
- G02B27/0101—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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- 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
- G02B2027/0178—Eyeglass type
Abstract
The application provides an augmented reality display system, which comprises a display image source, a light beam folding structure, a light ray collimation structure, a waveguide substrate and a waveguide internal reflection surface positioned in the waveguide substrate, wherein the light beam folding structure comprises a partial reflection partial transmission surface; the partially reflective and partially transmissive surface is configured to transmit a light beam from the display image source to the light collimating structure and transmit a light beam reflected by the light collimating structure to the waveguide substrate, the light collimating structure is configured to collimate and reflect the light beam to the partially reflective and partially transmissive surface, the waveguide substrate is configured to reflect and propagate the light beam to enter the waveguide internal reflection surface, and the waveguide internal reflection surface is configured to couple and output the light beam to a human eye. According to the scheme of this application, through utilizing the reflection beta structure, can realize the AR display system of compact glasses formula, and can effectively increase outside field of vision transmissivity, realize great FOV.
Description
Technical Field
The application relates to the technical field of optics, in particular to an augmented reality display system.
Background
A display system may be used to make a desired image visible to a user, such as an optical display system may be used in a head-mounted device to transmit and display the desired image so as to make the human eye visible, while an Augmented Reality (AR) technology has gained increasing attention as a technology to implement virtual and Reality integration, and an AR display system may be used to make a user feel a virtual effect generated by a digital image on the basis of a real scene. In the prior art, AR display systems are typically implemented using a Birdbath, a free-form prism, or an arrayed waveguide.
However, the AR display system in the prior art cannot be made into a glasses type display system due to its large volume, and has a low transmittance, which affects the viewing of the external visual field, thereby resulting in poor wearing experience.
Disclosure of Invention
The application aims to provide an AR display system which is novel and compact in structure and small in size.
According to one aspect of the present application, there is provided an augmented reality display system comprising a display image source, a beam folding structure, a light collimating structure, a waveguide substrate, and a waveguide internal reflection plane located within the waveguide substrate, the beam folding structure comprising a partially reflective partially transmissive plane;
the partially reflective and partially transmissive surface is configured to transmit a light beam from the display image source to the light collimating structure and transmit a light beam reflected by the light collimating structure to the waveguide substrate, the light collimating structure is configured to collimate and reflect the light beam to the partially reflective and partially transmissive surface, the waveguide substrate is configured to reflect and propagate the light beam to enter the waveguide internal reflection surface, and the waveguide internal reflection surface is configured to couple and output the light beam to a human eye.
In some embodiments, the partially reflective partially transmissive surface is configured to partially transmit light beams from the display image source to the light collimating structure and partially reflect light beams reflected by the light collimating structure to the waveguide substrate.
In some embodiments, the partially reflective partially transmissive surface is configured to partially reflect light beams from the display image source to the light collimating structure and to partially transmit light beams reflected by the light collimating structure to the waveguide substrate.
In some embodiments, the augmented reality display system further comprises a first optical structure located between the display image source and the beam folding structure.
In some embodiments, the augmented reality display system further comprises a second optical structure located between the beam folding structure and the light collimating structure. Optionally, the second optical structure is an 1/4 wave plate or a 45 ° phase retarder, and the beam folding structure has a polarization splitting effect; optionally, the beam folding structure is any one of: PBS, line grating, reflective polarizer.
In some embodiments, the waveguide internal reflecting surface comprises a plurality of reflecting surfaces.
In some embodiments, the light collimating structure is any one of: at least one mirror, at least one transmissive lens, a reflective transmissive lens combination.
In some embodiments, the waveguide internal reflection surface is a planar reflection surface or a curved reflection surface.
Compared with the prior art, the method has the following advantages: by utilizing the reflection folding structure, the volume of the AR display system is smaller, so that the compact glasses type AR display system can be realized, the transmittance of the external visual field can be effectively increased, the light energy entering human eyes from the external world in the AR display system can be improved, and the transmittance can reach more than 95%; further, by designing the waveguide internal reflection surface to include a plurality Of rows Of reflection surfaces, a large FOV (Field Of View) can be achieved.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 shows a schematic structural diagram of an AR display system of one example of the present application;
FIG. 2 shows a schematic diagram of a large FOV implementation based on the AR display system of FIG. 1;
FIG. 3 is a schematic diagram showing the arrangement of the internal reflecting surfaces of the waveguide shown in FIG. 1;
FIG. 4 shows a schematic structural diagram of an AR display system of another example of the present application;
FIG. 5 shows a schematic structural diagram of an AR display system of another example of the present application;
fig. 6 shows a schematic structural diagram of an AR display system according to another example of the present application.
The same or similar reference numbers in the drawings identify the same or similar elements.
Detailed Description
The present application is described in further detail below with reference to the attached figures.
According to one aspect of the present application, there is provided an augmented reality display system comprising a display image source, a beam folding structure, a light collimating structure, a waveguide substrate, and a waveguide internal reflection surface located within the waveguide substrate, the beam folding structure comprising a partially reflective partially transmissive surface; the partially reflective and partially transmissive surface is configured to transmit a light beam from the display image source to the light collimating structure and transmit a light beam reflected by the light collimating structure to the waveguide substrate, the light collimating structure is configured to collimate and reflect the light beam to the partially reflective and partially transmissive surface, the waveguide substrate is configured to reflect and propagate the light beam to enter the waveguide internal reflection surface, and the waveguide internal reflection surface is configured to couple and output the light beam to a human eye.
Wherein the display image source is used for emitting light beams for displaying images, and the display image source includes but is not limited to: LCD (Liquid Crystal Display), OLED (Organic Light-Emitting Diode), micro-OLED (micro Organic Light-Emitting Diode), micro-LED (micro Light-Emitting Diode), and LCoS (Liquid Crystal on Silicon).
It should be noted that the above-mentioned various display image sources are only examples, and the present application does not limit the display image sources, and it can be understood by those skilled in the art that any element or structure for emitting light beams for displaying images is included in the scope of the display image sources described in the present application.
The partial reflection partial transmission surface is used for realizing transmission and reflection of light beams, and the light beams can enter the partial reflection partial transmission surface twice after the light beams are emitted by the image source. In some embodiments, the partially reflective and partially transmissive surface is configured to partially transmit the light beam from the display image source to the light collimating structure and partially reflect the light beam reflected by the light collimating structure to the waveguide substrate, that is, the light beam emitted from the display image source is partially transmitted to the light collimating structure when passing through the partially reflective and partially reflected to the waveguide substrate when passing through the partially reflective and partially transmissive surface for the second time after being reflected by the light collimating structure. In other embodiments, the partially reflective and partially transmissive surface is configured to partially reflect the light beam from the display image source to the light collimating structure and partially transmit the light beam reflected by the light collimating structure to the waveguide substrate, that is, the light beam emitted from the display image source is partially reflected to the light collimating structure when passing through the partially reflective and partially transmitted to the waveguide substrate when passing through the partially reflective and partially transmissive structure for the second time after being reflected by the light collimating structure. When the optical system is actually designed, the position of the light collimating structure can be designed based on the requirement of the light beam sequence, for example, the light collimating structure can be arranged on one side of the light beam folding structure, which is far away from the display image source, and the angle of the light beam folding structure is consistent with the angle of the display image source (that is, the light beam folding structure is positioned between the display image source and the light collimating structure), so that the light beam originally emitted by the display head portrait can be partially transmitted to the light collimating structure when passing through the partially-reflective partially-transmissive surface for the first time, and can be partially reflected to the waveguide substrate when passing through the partially-reflective partially-transmissive surface for the second time after being reflected by the light collimating.
The light collimation structure is used for collimating the light beam entering through the partial reflection partial transmission surface and reflecting the collimated light beam out so that the light beam enters the partial reflection partial transmission surface for the second time. Optionally, the light collimating structure is any one of: at least one mirror, at least one transmissive lens, a reflective transmissive lens combination.
In some embodiments, the augmented reality display system further comprises a first optical structure located between the display image source and the beam folding structure. Wherein the first optical structure may be any optical device or combination of optical devices, for example, the first optical structure is a transmissive lens. In the actual design of the optical system, the first optical structure may be designed based on requirements, so that the light beam emitted from the display image source enters the light beam folding structure through the first optical structure.
In some embodiments, the augmented reality display system further comprises a second optical structure located between the beam folding structure and the light collimating structure. Wherein the second optical structure may be any optical device or combination of optical devices, for example, the second optical structure is a transmissive lens. When the optical system is actually designed, the second optical structure may be designed based on requirements, so that the light beam passes through the light beam folding structure for the first time, enters the light beam collimating structure through the second optical structure for collimation, and the light beam reflected by the light beam collimating structure enters the light beam folding structure through the second optical structure for the second time. In some embodiments, the second optical structure is an 1/4 wave plate or a 45 ° phase retarder, and the beam folding structure has a polarization splitting function, wherein the beam folding structure may be any optical structure having a polarization splitting function, such as a PBS (polarization beam splitter), a line grating, a reflective polarizer, and the like. In some embodiments, light from said display image source passes through said partially reflective partially transmissive surface a first time to become polarized light in a first state, passes through said second optical structure a first time to become circularly polarized light, is reflected by said light collimating structure, and passes through said second optical structure a second time to become polarized light in a second state; optionally, the polarized light in the first state is P light (i.e. polarized in the plane of the normal to the incident light ray), and the polarized light in the second state is S light (i.e. polarized perpendicular to the plane of the normal to the incident light ray).
After entering the waveguide substrate, the light beam can propagate inside the waveguide substrate in a total reflection or partial reflection mode to enter the waveguide internal reflection surface. Optionally, the waveguide substrate is a planar substrate or a curved substrate, and the shape of the waveguide internal reflection surface is not limited in this application.
The waveguide internal reflection surface is used for coupling the light beam transmitted in the waveguide substrate out of the waveguide substrate and entering human eyes. Optionally, the waveguide internal reflection surface is a planar reflection surface or a curved reflection surface (such as a spherical surface, a free-form surface, and the like), and the shape of the waveguide internal reflection surface is not limited in the present application. Optionally, the reflectivity of the waveguide internal reflection surface can be adjusted at will within a range of 5% to 100%, and the coating material of the waveguide internal reflection surface can be metal or other medium. In some embodiments, the waveguide internal reflecting surface comprises a plurality of reflecting surfaces; optionally, the plurality of reflecting surfaces are arranged in a plurality of rows, and the light beams entering the inner reflecting surface of the waveguide can be coupled out to the human eye through each row of reflecting surfaces, that is, each row of reflecting surfaces respectively reflects part of the FOV to the human eye, so that a larger FOV can be spliced in the human eye. It should be noted that the plurality of reflecting surfaces may adopt any arrangement, which is not limited in the present application, that is, the waveguide internal reflecting surface may include any rows, and each row may include any number of reflecting surfaces, and the present application also does not limit the shape, number, and size of the reflecting surfaces, and when the optical system is actually designed, the number of reflecting surfaces, the size, and the arrangement of each reflecting surface may be designed based on actual requirements. As an example, the waveguide internal reflection surface includes only 1 row, and 1 row has 3 reflection surfaces; as another example, the waveguide internal reflection surface includes 2 rows, with 4 reflection surfaces in row 1 and 5 reflection surfaces in row 2. Note that the aperture size of each reflecting surface is not limited in this application, and may be any size such as 0.5mm, 1.1mm, 1.5mm, 1.7mm, 2.4mm, or 5mm, and the aperture of each reflecting surface may be the same or different.
According to the scheme of the application, the volume of the AR display system is smaller by utilizing the reflection folding structure, so that the compact glasses type AR display system can be realized, the transmittance of the external visual field can be effectively increased, the light energy entering human eyes from the outside world in the AR display system is improved, and the transmittance can reach more than 95%; furthermore, by designing the waveguide internal reflecting surfaces to include multiple rows of reflecting surfaces, a larger FOV can be achieved.
Fig. 1 shows a schematic structural diagram of an AR display system according to an example of the present application. The AR display system comprises a display image source 101, a beam folding structure 102, a light collimating structure 103, a waveguide substrate 104, and a waveguide internal reflection surface 105 located within the waveguide substrate 104, wherein the beam folding structure 102 comprises a partially reflective partially transmissive surface 102-1. The beam folding structure 102 is located between the display image source 101 and the light collimating structure 103, and the display image source 101 and the light collimating structure 103 are disposed in parallel. The specific light path based on the AR display system is as follows: the display image source 101 emits a light beam for displaying an image, the light beam enters the light beam folding structure 102, passes through the partially reflective partially transmissive surface 102-1 for the first time, is partially transmitted to the light collimating structure 103, is reflected by the light collimating structure 103, passes through the partially reflective partially transmissive surface 102-1 for the second time, enters the waveguide substrate 104 after being partially reflected, propagates in the waveguide substrate 104 in a total reflection manner, enters the waveguide internal reflective surface 105, and is coupled and output to enter human eyes. In this example, the beam is partially transmitted when it passes 102-1 for the first time and partially reflected when it passes 102-1 for the second time.
FIG. 2 shows a schematic diagram of a principle for achieving a large FOV based on the AR display system shown in FIG. 1. Based on fig. 2, it can be seen that the reflective surfaces in the waveguide internal reflection surface 105 are arranged in three rows, which are respectively denoted as 105-1, 105-2, and 105-3 as shown in fig. 2, wherein each row includes a plurality of reflective surfaces, and 105-1, 105-2, and 105-3 respectively reflect part of the FOV to the human eye, so that a larger FOV can be finally spliced in the human eye.
Fig. 3 shows a schematic diagram of the arrangement of the internal reflection surfaces of the waveguide shown in fig. 1. As can be seen in FIG. 3, the reflective facets in the reflective facets 105 in the waveguide are arranged in three rows, a first row (i.e., 105-1 shown in FIG. 2) including 8 reflective facets, a second row (i.e., 105-2 shown in FIG. 2) including 9 reflective facets, and a third row (i.e., 105-3 shown in FIG. 2) including 8 reflective facets.
Fig. 4 shows a schematic structural diagram of an AR display system according to another example of the present application. The AR display system includes a display image source 201, a beam folding structure 202, a light collimating structure 203, a waveguide substrate 204, and a waveguide internal reflection surface 205 located within the waveguide substrate 204, wherein the beam folding structure 202 includes a partially reflective partially transmissive surface 202-1. Wherein the beam folding structure 202 is located on a side of the beam folding structure 202 away from the waveguide substrate 204, and an angle between the image source 201 and the light collimating structure 203 is shown to be 90 °. The specific light path based on the AR display system is as follows: the display image source 201 emits a light beam for displaying an image, the light beam enters the light beam folding structure 202, passes through the partially reflective partially transmissive surface 202-1 for the first time, is partially reflected to the light collimating structure 203, passes through the partially reflective partially transmissive surface 202-1 for the second time after being reflected by the light collimating structure 203, enters the waveguide substrate 204 after being partially transmitted, propagates in the waveguide substrate 204 in a total reflection manner, enters the waveguide internal reflective surface 205, is coupled and output, and enters a human eye. In this example, the beam is partially reflected on the first pass 202-1 and partially transmitted on the second pass 202-1.
Fig. 5 shows a schematic structural diagram of an AR display system according to another example of the present application. The AR display system includes a display image source 301, a beam folding structure 302, a light collimating structure 303, a waveguide substrate 304, a waveguide internal reflection surface 305 located within the waveguide substrate 304, and a second optical structure 306, wherein the beam folding structure 302 is a PBS, the beam folding structure 302 includes a partially reflective partially transmissive surface 302-1, the second optical structure 306 is an 1/4 wave plate or a 45 ° phase retarder, and the second optical structure 306 is located between the beam folding structure 302 and the light collimating structure 303. The specific light path based on the AR display system is as follows: the display image source 301 emits a light beam for displaying an image, the light beam enters the light beam folding structure 302 and passes through the partially reflective partially transmissive surface 302-1 for the first time, and partially transmits polarized light in a first state, then passes through the second optical structure 306 for the first time and becomes circularly polarized light, after being reflected by the light collimating structure 303, passes through the second optical structure 306 for the second time and becomes polarized light in a second state, and then passes through the partially reflective partially transmissive surface 302-1 for the second time, and after being partially reflected, enters the waveguide substrate 304, and is propagated into the waveguide internal reflective surface 305 in a total reflection manner, and then is coupled and output to a human eye.
Fig. 6 shows a schematic structural diagram of an AR display system according to another example of the present application. The AR display system comprises a display image source 401, a beam folding structure 402, a light collimating structure 403, a waveguide substrate 404, a waveguide internal reflection surface 405 located within the waveguide substrate 404, a first optical structure 406 and a second optical structure 407, wherein the beam folding structure 102 comprises a partially reflective partially transmissive surface 402-1, the first optical structure 406 is located between the display image source 401 and the beam folding structure 402, and the second optical structure 407 is located between the beam folding structure 403 and the light collimating structure 403. It should be noted that the first optical structure 406 and the second optical structure 407 in fig. 6 are merely illustrative, and the first optical structure 406 and the second optical structure 407 may be any optical structures. It should be noted that the AR display system shown in fig. 6 only schematically shows various parts, such as schematically indicating that the second optical structure 407 is located between the beam folding structure 403 and the light collimating structure 403, while in an actual structure, the beam folding structure 403 and the second optical structure 407 may be in direct contact, and the second optical structure 407 and the light collimating structure 403 may also be in direct contact.
It is noted that although the subject matter of the present application has been described in language specific to structural features, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features described above. Rather, the specific features described above are disclosed as example forms of implementing the claims.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. A plurality of units or means recited in the system claims may also be implemented by one unit or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
While exemplary embodiments have been particularly shown and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the claims. The protection sought herein is as set forth in the claims below. These and other aspects of the various embodiments are specified in the following numbered clauses:
1. an augmented reality display system comprising a display image source, a beam folding structure, a light collimating structure, a waveguide substrate, and a waveguide internal reflection plane located within the waveguide substrate, the beam folding structure comprising a partially reflective partially transmissive plane;
the partially reflective and partially transmissive surface is configured to transmit a light beam from the display image source to the light collimating structure and transmit a light beam reflected by the light collimating structure to the waveguide substrate, the light collimating structure is configured to collimate and reflect the light beam to the partially reflective and partially transmissive surface, the waveguide substrate is configured to reflect and propagate the light beam to enter the waveguide internal reflection surface, and the waveguide internal reflection surface is configured to couple and output the light beam to a human eye.
2. The augmented reality display system of clause 1, wherein the partially reflective partially transmissive surface is configured to partially transmit the light beam from the display image source to the light collimating structure and partially reflect the light beam reflected by the light collimating structure to the waveguide substrate.
3. The augmented reality display system of clause 1, wherein the partially reflective partially transmissive surface is configured to partially reflect light beams from the display image source to the light collimating structure and to partially transmit light beams reflected by the light collimating structure to the waveguide substrate.
4. The augmented reality display system of clause 1, wherein the augmented reality display system further comprises a first optical structure positioned between the display image source and the beam folding structure.
5. The augmented reality display system of clause 1, wherein the augmented reality display system further comprises a second optical structure located between the beam folding structure and the light collimating structure.
6. The augmented reality display system of clause 5, wherein the second optical structure is an 1/4 wave plate or a 45 ° phase retarder, and the beam folding structure has a polarization splitting effect.
7. The augmented reality display system of clause 6, wherein the beam folding structure is any one of: PBS, line grating, reflective polarizer.
8. The augmented reality display system of clause 6 or 7, wherein the light beam from the display image source is first passed through the partially reflective partially transmissive surface and then changed into polarized light in a first state, the polarized light in the first state is first passed through the second optical structure and then changed into circularly polarized light, and the circularly polarized light is reflected by the light collimating structure and then changed into polarized light in a second state after passing through the second optical structure.
9. The augmented reality display system of clause 8, wherein the polarized light of the first state is P-light and the polarized light of the second state is S-light.
10. The augmented reality display system of any one of clauses 1-9, wherein the waveguide internal reflecting surface comprises a plurality of reflecting surfaces.
11. The augmented reality display system of any one of clauses 1 to 10, wherein the light collimating structure is any one of: at least one mirror, at least one transmissive lens, a reflective transmissive lens combination.
12. The augmented reality display system of any one of clauses 1 to 11, wherein the waveguide internal reflection surface is a planar reflection surface or a curved reflection surface.
Claims (10)
1. An augmented reality display system comprising a display image source, a beam folding structure, a light collimating structure, a waveguide substrate, and a waveguide internal reflection plane located within the waveguide substrate, the beam folding structure comprising a partially reflective partially transmissive plane;
the partially reflective and partially transmissive surface is configured to transmit a light beam from the display image source to the light collimating structure and transmit a light beam reflected by the light collimating structure to the waveguide substrate, the light collimating structure is configured to collimate and reflect the light beam to the partially reflective and partially transmissive surface, the waveguide substrate is configured to reflect and propagate the light beam to enter the waveguide internal reflection surface, and the waveguide internal reflection surface is configured to couple and output the light beam to a human eye.
2. An augmented reality display system according to claim 1, wherein the partially reflective partially transmissive surface is arranged to partially transmit light beams from the display image source to the light collimating structure and to partially reflect light beams reflected by the light collimating structure to the waveguide substrate.
3. An augmented reality display system according to claim 1, wherein the partially reflective partially transmissive surface is arranged to partially reflect light beams from the display image source to the light collimating structure and to partially transmit light beams reflected by the light collimating structure to the waveguide substrate.
4. An augmented reality display system according to claim 1, wherein the augmented reality display system further comprises a first optical structure located between the display image source and the beam folding structure.
5. An augmented reality display system according to claim 1, wherein the augmented reality display system further comprises a second optical structure located between the beam folding structure and the light collimating structure.
6. An augmented reality display system according to claim 5, wherein the second optical structure is an 1/4 wave plate or a 45 ° phase retarder, the beam folding structure having a polarization splitting effect.
7. The augmented reality display system of claim 6, wherein the light beam from the display image source passes through the partially reflective partially transmissive surface a first time to become polarized light in a first state, passes through the second optical structure a first time to become circularly polarized light, is reflected by the light collimating structure, and passes through the second optical structure a second time to become polarized light in a second state.
8. The augmented reality display system of claim 7, wherein the polarized light of the first state is P light and the polarized light of the second state is S light.
9. An augmented reality display system according to any one of claims 1 to 8, wherein the waveguide internal reflecting surface comprises a plurality of reflecting surfaces.
10. An augmented reality display system according to any one of claims 1 to 9, wherein the light collimating structure is any one of: at least one mirror, at least one transmissive lens, a reflective transmissive lens combination.
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| TWI796878B (en) * | 2021-12-17 | 2023-03-21 | 宏碁股份有限公司 | Augmented reality display device |
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| WO2018233293A1 (en) * | 2017-06-23 | 2018-12-27 | 芋头科技（杭州）有限公司 | Imaging display system |
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| WO2018233293A1 (en) * | 2017-06-23 | 2018-12-27 | 芋头科技（杭州）有限公司 | Imaging display system |
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| TWI796878B (en) * | 2021-12-17 | 2023-03-21 | 宏碁股份有限公司 | Augmented reality display device |
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