CN114265278A - Projection optical device and AR display equipment - Google Patents
Projection optical device and AR display equipment Download PDFInfo
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- CN114265278A CN114265278A CN202010975179.8A CN202010975179A CN114265278A CN 114265278 A CN114265278 A CN 114265278A CN 202010975179 A CN202010975179 A CN 202010975179A CN 114265278 A CN114265278 A CN 114265278A
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Abstract
The invention discloses a projection optical device, which comprises a light source component, an image source component, a projection lens and a deflection reflector; the light source component is used for outputting illumination light; the image source group is used for forming projection light output of a projection image; the deflection reflector is arranged on an output light path of the image source assembly and is used for enabling the projection light to enter the deflection reflector at a preset angle and reflecting the projection light according to a preset direction; the projection lens is arranged on the output light path of the deflection reflector and used for transmitting and outputting projection light. This application has increased the deflection mirror between the image source subassembly of projection ray apparatus and the projecting lens, and projection ray apparatus outgoing projection reaches waveguide element and has promoted the compactedness of the AR display device structure of the projection ray apparatus of using this application to a certain extent to the requirement of the incident angle of the projection ray of incidence, is favorable to AR display device miniaturization development. The application also provides an AR display device with the beneficial effects.
Description
Technical Field
The present invention relates to the field of optical devices, and in particular, to a projection optical device and an AR display apparatus.
Background
The AR display device mainly includes two parts, the first part is a projector that outputs projection light carrying a display image, and the second part is a waveguide element that guides the projection light to human eyes. The projection light machine comprises light sources of three different colors of red, blue and green, a light combination element for combining light output by the light sources to form a white light beam, and various light path elements for guiding the white light beam into a chip with image information and reflecting projection light from the surface of the chip.
Therefore, for the whole AR display device, the number of optical path elements included in the projection optical machine, the waveguide element, and the like is large, and the optical path is complex, so that the space volume of the assembled AR display device is large, and the use experience of a user is influenced. Therefore, how to improve the compactness of optical path structures such as a projection optical machine and a waveguide element in the AR display device and further reduce the volume of the AR display device is one of the problems to be solved urgently in the industry at present.
Disclosure of Invention
The invention aims to provide a projection optical device and an AR display device, which reduce the length size of a projection optical machine and reduce the space of the projection optical machine.
In order to solve the above technical problems, the present invention provides a projection optical device, which includes a light source assembly, an image source assembly, a projection lens and a deflection mirror;
wherein the light source component is used for outputting illumination light; the image source assembly is positioned on an emergent light path of the light source assembly and is used for outputting projection light which forms a projection image by the incident illumination light;
the deflection reflector is arranged on an output light path of the image source assembly and is used for enabling the projection light to enter the deflection reflector at a preset angle and reflecting and emitting the projection light according to a preset direction;
the projection lens is arranged on an output light path of the deflection reflector and used for transmitting and outputting the projection light.
In an optional embodiment of the present application, further comprising an optical path deflecting element;
the light source assembly and the image source assembly are divided into two layers which are arranged in parallel, and the light path deflection element is arranged on an output light path of the light source assembly and an input light path of the image source assembly; the light path deflection element is used for deflecting the direction of the illumination light output by the light source assembly by 180 degrees and then enabling the illumination light to enter the image source assembly.
In an optional embodiment of the present application, the optical path deflecting element includes a first mirror disposed on an exit optical path of the light source assembly, and a second mirror disposed on an exit optical path of the first mirror; the image source assembly is arranged on an emergent light path of the second reflector;
the light ray direction of the light source assembly incident to the first reflector and the reflected emergent light ray of the second reflector are parallel to each other and opposite in direction.
In an optional embodiment of the present application, the first reflector and the second reflector are perpendicular to each other, and the direction of the emergent light of the first reflector and the light source module is a 45-degree included angle.
In an alternative embodiment of the present application, the optical path deflecting element is a triangular prism.
In an optional embodiment of the present application, the light source assembly includes a green light source, a red and blue light source, and a spectral filter; the light direction output by the green light source and the light direction output by the red and blue light source are mutually vertical, and the light is combined and output through the light splitting filter.
In an optional embodiment of the present application, the image source assembly comprises a polarizing beam splitter and an LCOS image source; the deflection mirror is arranged on an output light path of the polarization beam splitter;
or the image source assembly comprises a DMD image source and a prism; the deflection reflecting mirror is arranged on an output light path of the prism.
The present application also provides an AR display apparatus characterized by comprising the projection optical device according to any one of the above, and a waveguide element provided on an exit optical path of the projection optical device.
In an alternative embodiment of the present application, the AR display device is AR glasses, the waveguide element is a waveguide lens, and the projection optics arrangement is disposed inside a frame of the AR glasses.
The invention provides a projection optical device, which comprises a light source component, an image source component, a projection lens and a deflection reflector, wherein the light source component is arranged on the projection lens; the light source component is used for outputting illumination light; the image source assembly is positioned on an emergent light path of the light source assembly and is used for outputting projection light which forms incident illumination light into a projection image; the deflection reflector is arranged on an output light path of the image source assembly and is used for enabling the projection light to enter the deflection reflector at a preset angle and reflecting the projection light according to a preset direction; the projection lens is arranged on the output light path of the deflection reflector and used for transmitting and outputting projection light.
This application has increased the deflection mirror between the image source subassembly of projection ray machine and projecting lens, and this deflection mirror and image source subassembly output projection light's direction becomes specific angle, and then make the deflection mirror can reflect outgoing projection light according to the predetermined direction, so in display device such as AR glasses, can be through setting for the contained angle between deflection mirror and the projection light, make the direction of the final outgoing projection light of projection ray machine, reach waveguide element to the requirement of the incident angle of the projection light of incidence, need not to set up similar to prism optical element again between waveguide element and the projection ray machine, the compactness of the AR display device structure of the projection ray machine of using this application has been promoted to a certain extent, be favorable to the miniaturized development of AR display device.
The application also provides an AR display device with the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of an AR eyeglass wearing structure in the prior art;
FIG. 2 is a schematic diagram of an optical path structure of a projection optical machine in the prior art;
fig. 3 is a schematic structural diagram of a projection optical device according to an embodiment of the present application;
fig. 4 is a schematic side view of a projection optical device according to an embodiment of the present disclosure;
fig. 5 is a schematic view of the AR glasses provided in the embodiments of the present application.
Detailed Description
The conventional AR display device, such as the AR glasses shown in fig. 1, fig. 1 is a schematic structural diagram of the AR glasses worn in the prior art, and the waveguide lens 06 is formed by two pieces of waveguides, and when the waveguide lens 06 normally enters the main light of the projection optical machine 10 (i.e., the main light of the projection optical machine enters the waveguide lens 06 perpendicularly), the display effect is the best. However, the waveguide lens 06 is mounted as a lens to AR glasses, and in order to satisfy wearing comfort, the waveguide lens 06 and the temple 07 are generally disposed non-vertically.
As shown in fig. 2, fig. 2 is a schematic diagram of an optical path structure of a projection optical engine in the prior art, and for a conventional projection optical engine 10, an optical path thereof is substantially straight, and when the projection optical engine 10 is disposed in a temple 07 of AR glasses, a principal ray direction of an output projection light is substantially the same as a length direction of the temple 07. It is obvious that the chief ray of the projection light output by the projection light engine 10 arranged in the mirror foot 07 can not be vertically incident into the waveguide lens 06. In order to ensure that the main light of the projector can be incident perpendicularly to the 06 surface of the waveguide lens, a transfer prism 08 is needed to realize the main light normal incidence waveguide surface of the projection optical machine 10, so that the complexity of the structure of the AR glasses is increased, and the volume and the cost of the AR glasses are further increased.
Similarly, when the optical projector 10 is applied to other AR display devices and is mounted on the non-temple portion of AR glasses, the principal ray of the projection light and the waveguide surface are not perpendicular, and the direction of the projection light needs to be adjusted by a turning optical element similar to the relay prism 08. To some extent, increases the complexity and volume of space occupied by the AR display device structure, and increases cost.
Therefore, the application provides a projection optical device, the angle of the output projection light can be set according to the requirement of the waveguide element, and optical elements such as a prism do not need to be arranged between the projection optical device and the waveguide element, so that the structure of the AR display device is more compact, and the miniaturization of the AR display device is facilitated.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 3 to 5, fig. 3 is a schematic structural diagram of a projection optical device according to an embodiment of the present application; fig. 4 is a schematic side view of a projection optical device according to an embodiment of the present disclosure; fig. 5 is a schematic view of the AR glasses provided in the embodiments of the present application. The projection light apparatus provided in the present application may include:
the device comprises a light source component 1, an image source component 2, a projection lens 24 and a deflection reflector 23;
wherein, the light source component 1 is used for illuminating light; the image source assembly 2 is positioned on an emergent light path of the light source assembly 1 and is used for outputting projection light which forms incident illumination light into a projection image;
the deflection reflector 23 is arranged on an output light path of the image source assembly 2, and is used for enabling the projection light to enter the deflection reflector 23 at a preset angle and reflecting the projection light according to a preset direction;
the projection lens 24 is disposed on the output optical path of the deflecting mirror 23, and is used for transmitting and outputting the projection light.
It can be understood that the reflector has an effect of changing the transmission direction of the light path for the light, and the deflection reflector 23 is disposed on the output light path of the image source assembly 2 in the present application, so that the deflection of the light path of the projection light output by the image source assembly 2 can be realized to a certain extent.
As shown in fig. 3, the deflecting mirror 23 is disposed in the output light path of the image source assembly, and the direction of the deflecting mirror 23 can be set according to the relative position of the waveguide unit with respect to the projection light engine 10. As shown in fig. 5, when the projection optical device 10 is applied to the AR glasses and is installed in the temple of the AR glasses, the angle of the deflection mirror 23 relative to the projection light can be set according to the included angle between the direction of the projection light output by the image source assembly 2 of the projection optical device 10 and the waveguide lens 06, so that the projection light is incident according to the angle required by the waveguide lens 06, without adding optical elements such as prisms, and the like, thereby improving the compactness of the structure of the AR display device when the projection optical device 10 is applied to the AR display device to a certain extent, and being beneficial to the miniaturization of the AR display device.
In addition, in order to ensure the image clarity of the outputted projection light on human eyes through the waveguide element, the optical axis of the projection lens 24 and the optical axis of the projection light reflected by the deflecting mirror 23 should coincide.
To sum up, through add deflection mirror 23 in projection light machine 10 in this application to through setting up deflection mirror 23 for the angle of projection light, realize projection light machine 10 directional output projection light, when projection light machine 10 practical application was in AR display device then, just need not to increase other optical elements between projection light machine 10 and the waveguide component again, increased the compactness of AR display device structure, be favorable to AR display device's miniaturized application.
Based on the above embodiment, as shown in fig. 2, in the projection light engine 10 of the conventional AR display device, the light beams output by the red light source 01, the blue light source 02 and the green light source 03 are combined and then output after sequentially passing through the PBS 04, the image display chip 05 and other optical elements, and the whole light path structure is a linear structure, so that the projection light engine 10 occupies a larger space in the length direction. Referring to fig. 1, the projection light machine 10 is disposed in the temple 07 of the AR glasses, because the projection light machine 10 needs to occupy a certain space length, and then the portion for accommodating the projection light machine 10 on the temple 07 is relatively large, on one hand, the volume of the temple 07 is increased, on the other hand, the temple 07 extrudes the temple 07 to the temple point on the head of the wearer, which brings uncomfortable use experience to the user, and affects the folding of the temple 07.
To this end, in an optional embodiment of the present application, the light projector 10 may further include:
an optical path deflecting element 3;
the light source component 1 and the image source component 2 are divided into two layers which are arranged in parallel, and the light path deflection element 3 is arranged on an output light path of the light source component 1 and an input light path of the image source component 2; the optical path deflecting element 3 is used for deflecting the direction of the illumination light output by the light source assembly 1 by 180 degrees and then inputting the illumination light into the image source assembly 2.
In this embodiment, the light path structure of the whole projection light machine 10 is divided into two parts, one part is the light source module 1, the other part is the image source module 2, and the light path deflecting element 3 is further disposed between the light source module 1 and the image source module 2.
Compared with the prior art, the light source module 1 and the image source module 2 in the present application are not arranged in a straight line, but stacked in an upper-lower structure. As shown in fig. 3 and fig. 4, in this application, the light source module 1 and the image source module 2 are laminated to each other, accordingly, the output optical axis of the light source module 1 and the optical axis of the image source module 2 are parallel to each other, the light path deflecting element 3 is disposed at the same end of the light source module 1 and the image source module 2, the light path deflecting element 3 can deflect the light beam path of the combined light output by the light source module 1 by 180 degrees, and the whole light beam is translated to the optical axis of the image source module 2.
As can be seen from the optical path structures shown in fig. 2 and fig. 3, as for the optical path structure of the whole projection optical engine 10, compared with the prior art, the projection optical engine 10 in the present embodiment is equivalent to folding the whole linear optical path from the middle of the optical path, and implementing the deflection by the optical path deflecting element 3. This results in a reduction of the entire projection optics arrangement by half in the direction of the optical axis length. Because the length of projection optical machine device reduces, when projection optical machine 10 sets up in the earpiece 07 of AR glasses, the part that holds projection optical machine 10 also does not extend to the temple position of wearer, and then can not lead to the fact the extrusion to wearer's head, is favorable to improving the comfort level that the wearer used AR glasses to be convenient for realize earpiece 07's folding function.
Of course, the projection optical device provided in the present application is not limited to be applied to the AR glasses, and may be applied to other devices including the projection optical device and having a limitation on the length of the projection optical device.
In summary, the whole light path of the projection optical device in this embodiment is divided into the light source assembly and the image source assembly, and the two light paths are folded and arranged, and the light beam is deflected at the light path deflection position by the light path deflection element, so that the length of the whole projection optical device in the direction of the optical axis is smaller by half, the structure of the whole projection optical device is more compact, the projection optical device is suitable for various installation similar to that of AR glasses, and the user experience is improved.
Based on the above embodiments, in an alternative embodiment of the present application, the optical path deflecting element 3 includes a first reflecting mirror 31 disposed on the exit optical path of the light source assembly 1, and a second reflecting mirror 32 disposed on the exit optical path of the first reflecting mirror 31; the image source assembly 2 is arranged on the emergent light path of the second reflecting mirror 32;
the direction of the light incident on the first reflector 31 from the light source assembly 1 and the direction of the reflected emergent light from the second reflector 32 are parallel and opposite to each other.
As shown in fig. 3 and 4, in the present application, the combined light beam output by the light source assembly 1 is deflected twice by the first reflecting mirror 31 and the second reflecting mirror 32, so that the transmission direction of the output light beam of the light source assembly 1 is deflected by 180 degrees and enters the image source assembly 2. For example, the first reflector 31 and the second reflector 32 may be perpendicular to each other, and the combined light beam output by the light source assembly 1 is incident on the first reflector 31 at an incident angle of 45 degrees and is reflected from the first reflector 31 to the second reflector 32, it is obvious that the combined light beam is reflected by the first reflector 31, the optical path is deflected by 90 degrees, and the incident angle of the combined light beam incident on the second reflector 32 is 45 degrees, so that the combined light beam is reflected by the second reflector 32, and the combined light beam is deflected again by 90 degrees and is incident on the image source assembly 2.
Of course, it is understood that the first reflector 31 and the second reflector 32 are not necessarily perpendicular to each other, and accordingly, the angle of the combined light beam output by the light source assembly 1 incident on the first reflector 31 and the second reflector 31 is not necessarily 45 degrees, as long as the light beams finally incident on the first reflector 31 and the light beam finally emergent from the second reflector 32 are opposite in direction.
In another alternative embodiment of the present application, the optical path deflecting element 3 may be a triangular prism, and the combined light beam is deflected by 180 degrees by multiple reflections of the combined light beam on each surface of the triangular prism. The prism may be a right-angle prism or other prisms, and no specific limitation is made in this application.
For the light source module in the present application, it is mainly the light after red light, green light and blue light are combined. To this end, the light source assembly 1 may specifically include:
a green light source 11, a red-blue light source 12, and a spectral filter 13; the direction of the light output by the green light source 11 and the direction of the light output by the red and blue light source 12 are perpendicular to each other, and the light is combined and output through the spectral filter 13.
In order to reduce the number of optical elements of the whole light source assembly 1 as much as possible and further reduce the spatial volume of the projection light device, the red light source 12 and the blue light source are provided with a red and blue light source 12 capable of outputting red light beams and blue light beams simultaneously. In the light combination, only the red and blue light and the green light need to be combined through the spectral filter 13.
In addition, in order to increase the uniformity of the color mixture of the combined light output from the light source module 1, a fly-eye lens 14 may be further provided on the output optical path of the spectral filter.
Of course, the light source module 1 is not limited to this light path structure, for example, the combined light of the red light and the green light is a yellow light, so that the combined light can also be obtained by combining two light sources, i.e. a yellow light source and a blue light source. Of course, the light source module 1 can directly adopt a white light source, and the number of optical elements of the whole light source module 1 is further reduced. Similar technical schemes are not listed in the application.
Based on any of the above embodiments, in an optional embodiment of the present application, the image source assembly 2 comprises a polarizing beam splitter 21 and a LOCS image source 22, and a deflecting mirror 23 is disposed in an output optical path of the polarizing beam splitter 21.
As shown in fig. 3 and 4, the fly eye lens 14 is disposed on the outgoing light path of the spectral filter 13, the light beams output by the light sources of each color are combined by the spectral filter 13, then enter the optical path deflecting element 3 through the fly eye lens 14, enter the polarization beam splitter 21 through the optical path deflecting element 3, enter the image display chip 22 through the splitting surface of the polarization beam splitter 21, reflect the projection light beam carrying the projected image from the surface of the image display chip 22, and output to the deflecting mirror 23 through the polarization beam splitter 22.
It is also not limited to the use of a polarizing beam splitter 21 and a LOCS image source 22 for the image source assembly 2, but may also include, for example, a DMD image source and a prism; similarly, the deflecting mirror 23 is disposed on the output light path of the prism, and the image source assembly in this application may also be in other structures, which is not limited in this application.
Also disclosed herein is an AR display device comprising a projection light apparatus as described in any one of the above, and a waveguide element disposed in an output optical path of the projection light apparatus.
Referring to fig. 5, the AR display device may be an AR glasses, the waveguide unit is a waveguide lens, the projection optical device is disposed in the temple of the AR glasses or above the lens and other positions of the frame, the projection light output by the projection optical device is incident into the waveguide lens 06 and guided into the human eye by the waveguide lens 06, so that the wearer views the projection display picture.
The utility model provides a projection optical device has less length size for conventional projection optical device for projection optical device's structure is more compact, and then reduces shared space size on projection optical device length direction to a certain extent, is favorable to AR display device's miniaturization.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include elements inherent in the list. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. In addition, parts of the above technical solutions provided in the embodiments of the present application, which are consistent with the implementation principles of corresponding technical solutions in the prior art, are not described in detail so as to avoid redundant description.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. A projection optical device is characterized by comprising a light source component, an image source component, a projection lens and a deflection reflector;
wherein the light source component is used for outputting illumination light; the image source assembly is positioned on an emergent light path of the light source assembly and is used for outputting projection light which forms a projection image by the incident illumination light;
the deflection reflector is arranged on an output light path of the image source assembly and is used for enabling the projection light to enter the deflection reflector at a preset angle and reflecting and emitting the projection light according to a preset direction;
the projection lens is arranged on an output light path of the deflection reflector and used for transmitting and outputting the projection light.
2. The projection optical apparatus according to claim 1, further comprising an optical path deflecting element;
the light source assembly and the image source assembly are divided into two layers which are arranged in parallel, and the light path deflection element is arranged on an output light path of the light source assembly and an input light path of the image source assembly; the light path deflection element is used for deflecting the direction of the illumination light output by the light source assembly by 180 degrees and then enabling the illumination light to enter the image source assembly.
3. The opto-mechanical device according to claim 2, wherein the optical path deflecting element comprises a first mirror disposed in an exit path of the light source assembly and a second mirror disposed in an exit path of the first mirror; the image source assembly is arranged on an emergent light path of the second reflector;
the light ray direction of the light source assembly incident to the first reflector and the reflected emergent light ray of the second reflector are parallel to each other and opposite in direction.
4. The projection camera apparatus of claim 3, wherein the first reflector and the second reflector are perpendicular to each other, and the first reflector and the light source assembly emit light rays at a 45 degree angle.
5. The projection optical apparatus according to claim 2, wherein the optical path deflecting element is a triangular prism.
6. The apparatus of claim 1, wherein the light source assembly comprises a green light source, a red and blue light source, and a dichroic filter; the light direction output by the green light source and the light direction output by the red and blue light source are mutually vertical, and the light is combined and output through the light splitting filter.
7. The projection light apparatus of claim 1, wherein the image source assembly comprises a polarizing beam splitter and an LCOS image source; the deflection mirror is arranged on an output light path of the polarization beam splitter;
or the image source assembly comprises a DMD image source and a prism; the deflection reflecting mirror is arranged on an output light path of the prism.
8. An AR display device comprising the projection optical device according to any one of claims 1 to 7, and a waveguide member provided on an exit optical path of the projection optical device.
9. The AR display device of claim 8, wherein the AR display device is AR glasses, the waveguide element is a waveguide lens, and the projection optics arrangement is disposed inside a frame of the AR glasses.
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| CN202010975179.8A CN114265278A (en) | 2020-09-16 | 2020-09-16 | Projection optical device and AR display equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010975179.8A CN114265278A (en) | 2020-09-16 | 2020-09-16 | Projection optical device and AR display equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114967160A (en) * | 2022-07-28 | 2022-08-30 | 歌尔光学科技有限公司 | Projection display assembly and augmented reality display device |
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| CN107003528A (en) * | 2014-11-27 | 2017-08-01 | 索尼公司 | Optical devices and display device |
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| JP2003066367A (en) * | 2001-08-24 | 2003-03-05 | Sharp Corp | Projection type display device |
| CN107003528A (en) * | 2014-11-27 | 2017-08-01 | 索尼公司 | Optical devices and display device |
| US20170299877A1 (en) * | 2016-04-13 | 2017-10-19 | Delta Electronics, Inc. | Near-eye display device |
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