CN112415744A - Augmented reality display system - Google Patents
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- CN112415744A CN112415744A CN201910776073.2A CN201910776073A CN112415744A CN 112415744 A CN112415744 A CN 112415744A CN 201910776073 A CN201910776073 A CN 201910776073A CN 112415744 A CN112415744 A CN 112415744A
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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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Abstract
The present invention relates to an augmented reality display system, comprising: a light source for providing image light; at least two diffractive waveguide lenses comprising a lens body and a functional area disposed on the lens body; and at least one filter layer for isolating unwanted light is provided, said filter layer being arranged between two of said diffractive waveguide lenses. This augmented reality display system sets up the filter layer through laminating between two diffraction waveguide lens for separate the incidence of unnecessary light, after image light passes through preceding diffraction waveguide lens, partial image light that does not couple in completely passes through the filter layer after, realizes light filtering, can't get into next diffraction waveguide lens. Therefore, the augmented reality display system can realize the independent control of the wave band light of each diffraction waveguide lens, thereby eliminating the random light incidence, avoiding the phenomena of image chromatic aberration ghost and the like caused by light crosstalk, and improving the experience comfort level.
Description
Technical Field
The invention relates to an augmented reality display system, and belongs to the technical field of optics.
Background
Augmented Reality (AR) technology is a new technology for seamlessly integrating real world information and virtual world information, not only shows the real world information, but also simultaneously displays the virtual information, and the two kinds of information are mutually supplemented and superposed. In visual augmented reality, the user can see the real world around it by re-composing the real world with computer graphics using a head mounted display. Most of the current mainstream near-eye augmented reality display devices adopt the optical waveguide principle. For example, Lumus implements AR display by an array grating design, which display has a pupil-expanding effect, but there is a shutter effect, affecting the viewing experience. Microsoft uses the superposition of three layers of diffraction waveguide lenses to realize AR display. In the method for realizing color by superposing a plurality of lenses, theoretically, each lens only needs to work on light of a specific waveband, and other wavebands are filtered or absorbed, however, in most cases, due to the problems of structural design defects or preparation process errors and the like, part of interference light transmission routes are wrong, optical crosstalk is caused, and the experience effect is influenced.
Referring to fig. 1, light of three wavelength bands emitted from a light source of a conventional augmented reality display system is incident on a first diffractive waveguide lens 1-1 in a certain direction. Light of a certain wavelength band is coupled in and conducted through a first coupling-in area 1-11 of the first diffractive waveguide lens 1-1, and is led out through a first coupling-out area 1-12. The light of the rest wave bands which is not suitable for the first diffraction lens 1-1 is continuously transmitted to the second diffraction waveguide lens 1-2 and the third diffraction waveguide lens 1-3, wherein the light of one wave band is coupled in and conducted through the second coupling-in area 1-21 of the second diffraction waveguide lens 1-2 and is led out through the second coupling-out area 1-22, the light of the last wave band is coupled in and conducted through the third coupling-in area 1-31 of the third diffraction waveguide lens 1-3 and is led out through the third coupling-out area 1-32, and the light of the third intermediate wave band is finally collected to human eyes from the third coupling-out area 1-32, so that color display is realized. However, in the ideal situation, in the process detection link, the light matched with the first diffractive waveguide lens 1-1 cannot be completely transmitted by the lens diffraction, and part of the light continues to be transmitted in the second diffractive waveguide lens 1-2 and the third diffractive waveguide lens 1-3 with weak efficiency and is reflected between the two diffractive waveguide lenses, so that interference light is formed, the light is not uniformly matched, the imaging quality is finally affected, and poor viewing experience is formed.
Disclosure of Invention
The invention aims to provide an augmented reality display system which eliminates the light ray random entry and crosstalk and improves the experience comfort level by attaching a filter layer between diffraction waveguide lenses.
In order to achieve the purpose, the invention provides the following technical scheme: an augmented reality display system comprising:
a light source for providing image light;
at least two diffractive waveguide lenses comprising a lens body and a functional area disposed on the lens body;
at least one filter layer for isolating unwanted light, the filter layer being disposed between two of the diffractive waveguide lenses.
Further, the functional region includes a coupling-in region and a coupling-out region, and the coupling-in region and the coupling-out region respectively couple the image light into the diffractive waveguide lens and output the image light propagating from the inside of the diffractive waveguide lens to the outside of the diffractive waveguide lens.
Further, the functional region further comprises a turning region for changing the propagation direction of the image light within the diffractive waveguide lens.
Further, a periodic grating structure formed by a nano structure is arranged in the functional area, and the periodic grating structure comprises any one or more of a tilted grating, a bulk grating or a rectangular grating.
Further, the filter layer is arranged between the coupling-in areas of the two diffractive waveguide lenses.
Further, the filtering mode of the filter layer is selected from any one or more of selective transmission, reflection or absorption.
Further, the filter layer is selected from any one of a soft film, a thin glass coating film or a color photoresist.
Further, the filter layer and the diffraction waveguide lens are connected through an adhesive.
Further, the augmented reality display system includes a first diffractive waveguide optic, a second diffractive waveguide optic, and a filter layer disposed between the first and second diffractive waveguide optics.
Further, the filter layer is used for blocking green light and transmitting magenta light.
Further, the filter layer is used for blocking pinkish red light and transmitting green light.
Further, the augmented reality display system includes a first diffractive waveguide optic, a second diffractive waveguide optic, a third diffractive waveguide optic, a first optical filter disposed between the first and second diffractive waveguide optics, and a second optical filter disposed between the second and third diffractive waveguide optics.
Furthermore, the first filter layer is used for blocking green light and transmitting red light and blue light, the second filter layer is used for blocking red light and transmitting blue light or the second filter layer is used for blocking blue light and transmitting red light.
Further, the first filter layer is used for blocking blue light and transmitting red light and green light, the second filter layer is used for blocking red light and transmitting green light, or the second filter layer is used for blocking green light and transmitting red light.
Further, the first filter layer is used for blocking red light and transmitting blue light and green light, the second filter layer is used for blocking blue light and transmitting green light, or the second filter layer is used for blocking green light and transmitting blue light.
Further, the light source includes an LED, a laser, an LCD, or an OLED, etc.
Compared with the prior art, the invention has the beneficial effects that: according to the augmented reality display system, the filter layer is attached between the two diffraction waveguide lenses and used for isolating the incidence of unnecessary light, and after image light passes through the previous diffraction waveguide lens, part of the image light which is not completely coupled in passes through the filter layer, the light filtering is realized, and the image light cannot enter the next diffraction waveguide lens. Therefore, the augmented reality display system provided by the invention can realize independent control of the band light of each diffraction waveguide lens by arranging the filter layer between every two diffraction waveguide lenses, so that the phenomenon that the light enters in a mess, the phenomenon of image chromatic aberration ghost and the like caused by light crosstalk is avoided, and the experience comfort level is improved.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of an augmented reality display system in the prior art;
fig. 2 is a schematic structural diagram of an augmented reality display system according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a first diffractive waveguide lens in the augmented reality display system shown in FIG. 2;
FIG. 4 is a schematic illustration of the structure of a diffractive waveguide optic shown in other non-illustrated embodiments of the invention;
fig. 5 is a schematic structural diagram of an augmented reality display system according to another embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
It should be noted that: the terms "upper", "lower", "left", "right", "inner" and "outer" of the present invention are used for describing the present invention with reference to the drawings, and are not intended to be limiting terms.
Referring to fig. 2 and fig. 3, an augmented reality display system according to an embodiment of the present invention includes:
a laser light source (not shown) for providing incident image light, but may be other light sources such as LED, LCD or OLED in other embodiments. The laser light source irradiation part is provided with a first diffraction waveguide lens 2-1 and a second diffraction waveguide lens 2-2, each diffraction waveguide lens comprises a lens body and a functional area arranged on the lens body, and specifically: the first diffractive waveguide lens 2-1 comprises a first lens body 2-10, a first coupling-in area 2-11 arranged on the first lens body 2-10, and a first coupling-out area 2-12 arranged on the first lens body 2-10; the second diffractive waveguide lens 2-2 comprises a second lens body 2-20, a second coupling-in area 2-21 arranged on the second lens body 2-20, and a second coupling-out area 2-22 arranged on the second lens body 2-20. Further, a filter layer 2-3 for isolating unnecessary light (for example, various kinds of disturbance light and stray light) is provided between the first diffractive waveguide lens 2-1 and the second diffractive waveguide lens 2-2.
In the present embodiment, the functional areas on the first diffractive waveguide lens 2-1 and the second diffractive waveguide lens 2-2 mainly include a coupling-in area (first coupling-in area 2-11 and second coupling-in area 2-21) and a coupling-out area (first coupling-out area 2-12 and second coupling-out area 2-22). In the present embodiment, a periodic grating structure (not shown) formed by nano-structures is disposed in both the coupling-in region and the coupling-out region, and may be any one or more of a tilted grating, a bulk grating, or a rectangular grating, which is a prior art and will not be described in detail herein. The incident image light is coupled to the diffraction waveguide lens, firstly enters the coupling-in area, is diffracted by the nano structure, the angle of the diffraction light meets the requirement of waveguide total reflection, the light is conducted along the total reflection direction, is coupled to the coupling-out area, is diffracted by the nano structure, and is output to human eyes. It is needless to say that in other embodiments, a three-zone type or a multi-zone type may be adopted, for example, please refer to fig. 4, and in other embodiments, the illustrated three-zone type diffractive waveguide lens may be adopted, and specifically, the diffractive waveguide lens 1 includes a lens body 10, and a coupling-in zone 11, a turning zone 12 and a coupling-out zone 13 disposed on the lens body 10. The incident image light is coupled to the diffraction waveguide lens 1, firstly enters the coupling-in area 11, is diffracted by the nano structure, the angle of the diffraction light meets the requirement of waveguide total reflection, the light is conducted along the total reflection direction, is coupled to the turning area 12, is turned by the diffraction of the nano structure, is conducted to the coupling-out area 13, and is output to human eyes by the diffraction of the nano structure. The image light enters from the waveguide lens coupling-in area 11, is conducted to the coupling-out area 13 through the turning area 12, and exits from the coupling-out area 13, so that the field of view in the horizontal direction and the vertical direction is expanded.
In this embodiment, the filter layer 2-3 is used to block green light and transmit magenta light, preferably, the filter layer 2-3 is disposed between the second coupling-in area 2-21 and the first diffractive waveguide lens 2-1 to ensure the filtering effect thereof, and the filter layer 2-3 is disposed on the first diffractive waveguide lens 2-1 by an adhesive. The filter layers 2-3 are used to filter light by absorbing light, and indeed, in other embodiments, light filtering may be performed by selective transmission or reflection. Specifically, light of three wave bands emitted from the light source is incident to the first diffractive waveguide lens 2-1 in a certain direction, and light of one wave band suitable for the first diffractive waveguide lens 2-1 is coupled in and conducted through the lens and is guided out in the first coupling-out area 2-12. And after part of image light which is not completely coupled in passes through the filter layer 2-3, light filtering is realized, so that green light cannot enter the second diffraction waveguide lens 2-2. While the remaining wavelength band light (including magenta light) for the second diffractive waveguide lens 2-2 continues to be coupled in, guided through the lens and directed out at the second coupling-out area 2-22. The design enables the augmented reality display system of the invention to realize the independent control of the wave band light of each lens, and avoids the generation of phenomena such as light crosstalk, image chromatic aberration ghost and the like. Indeed, in other embodiments, the filter layers 2-3 may also be used to block magenta light, transmit green light, or filter other wavelength bands according to actual needs, and are not limited herein. In addition, in the present embodiment, the filter layers 2-3 are selected from a soft film to achieve filtering, and indeed, in other embodiments, the filter layers may also be thin glass coating films, or may also be color resist color matching for filtering.
Referring to fig. 5, an augmented reality display system according to another embodiment of the present invention includes:
a laser light source (not shown) for providing incident image light, but may be other light sources such as LED, LCD or OLED in other embodiments. The laser light source irradiation part is provided with a first diffraction waveguide lens 3-1, a second diffraction waveguide lens 3-2 and a third diffraction waveguide lens 3-3, each diffraction waveguide lens comprises a lens body and a functional area arranged on the lens body, and specifically: the first diffractive waveguide lens 3-1 comprises a first lens body 3-10, a first coupling-in area 3-11 provided on the first lens body 3-10, and a first coupling-out area 3-12 provided on the first lens body 3-10; the second diffractive waveguide lens 3-2 comprises a second lens body 3-20, a second coupling-in area 3-21 arranged on the second lens body 3-20, and a second coupling-out area 3-22 arranged on the second lens body 3-20; the third diffractive waveguide lens 3-3 comprises a third lens body 3-30, a third coupling-in area 3-31 arranged on the third lens body 3-30, and a third coupling-out area 3-32 arranged on the third lens body 3-30. And a first filter layer 3-4 and a second filter layer 3-5 for isolating unnecessary light are provided between the first diffractive waveguide lens 3-1 and the second diffractive waveguide lens 3-2, and between the second diffractive waveguide lens 3-2 and the third diffractive waveguide lens 3-3, respectively.
In this embodiment, image light rays of three wavelength bands emitted from the light source are incident on the first diffractive waveguide lens 3-1 in a certain direction, and the wavelength band light suitable for the first diffractive waveguide lens 3-1 is coupled in and conducted by the lens and is guided out in the first coupling-out area 3-12. After part of light which is not completely coupled into the first diffraction waveguide lens 3-1 passes through the first filter layer 3-4, light filtering is realized, and the light cannot enter the second diffraction waveguide lens 3-2. While light of a wavelength band suitable for the second diffractive waveguide lens 3-2 continues to be coupled in via the lens, guided and guided out at the second coupling-out area 3-22. And part of light which is not completely coupled into the second diffraction waveguide lens 3-2 passes through the second filter layer 3-5, so that light is filtered, and the light cannot enter the third diffraction waveguide lens 3-3. While light of a wavelength band suitable for the third diffractive waveguide lens 3-3 continues to be coupled in, guided through the lens and directed out at a third coupling-out area 3-32. The design enables the augmented reality display system of the invention to realize independent control of the wave band light of each lens, and avoids the phenomena of image chromatic aberration ghost and the like caused by light crosstalk. In the present embodiment, the first filter layer 3-4 is used to block green light and transmit red light and blue light, and the second filter layer 3-5 is used to block red light and transmit blue light.
In another non-illustrated embodiment, the first filter layer is configured to block green light and transmit red and blue light, and the second filter layer is configured to block blue light and transmit red light.
In another non-illustrated embodiment, the first filter layer is configured to block blue light and transmit red and green light, and the second filter layer is configured to block red light and transmit green light.
In another non-illustrated embodiment, the first filter layer is configured to block blue light and transmit red and green light, and the second filter layer is configured to block green light and transmit red light.
In another non-illustrated embodiment, the first filter layer is configured to block red light and transmit blue and green light, and the second filter layer is configured to block blue light and transmit green light.
In another non-illustrated embodiment, the first filter layer is configured to block red light and transmit blue and green light, and the second filter layer is configured to block green light and transmit blue light.
Indeed, in other embodiments, the light beams for filtering by the first filter layer 3-4 and the second filter layer 3-5 may be designed according to actual needs, and are not limited herein.
In the above embodiments, one filter layer is disposed between two adjacent diffractive waveguide lenses, and in other embodiments, when three or more diffractive waveguide lenses are disposed, the filter layer may be disposed between only one pair of two adjacent diffractive waveguide lenses, and the number of the filter layers is not limited.
In summary, the following steps: according to the augmented reality display system, the filter layer is attached between the two diffraction waveguide lenses and used for isolating the incidence of unnecessary light, and after image light passes through the previous diffraction waveguide lens, part of the image light which is not completely coupled in passes through the filter layer, the light filtering is realized, and the image light cannot enter the next diffraction waveguide lens. Therefore, the augmented reality display system provided by the invention can realize independent control of the band light of each diffraction waveguide lens by arranging the filter layer between every two diffraction waveguide lenses, so that the phenomenon that the light enters in a mess, the phenomenon of image chromatic aberration ghost and the like caused by light crosstalk is avoided, and the experience comfort level is improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (15)
1. An augmented reality display system, comprising:
a light source for providing image light;
at least two diffractive waveguide lenses comprising a lens body and a functional area disposed on the lens body;
at least one filter layer for isolating unwanted light, the filter layer being disposed between two of the diffractive waveguide lenses.
2. The augmented reality display system of claim 1, wherein the functional region comprises an in-coupling region and an out-coupling region, the in-coupling region and the out-coupling region respectively coupling the image light into the diffractive waveguide lens and outputting the image light propagating from inside the diffractive waveguide lens to outside the diffractive waveguide lens.
3. The augmented reality display system of claim 2, wherein the functional region further comprises a turning region for changing a direction of propagation of the image light within the diffractive waveguide lens.
4. The augmented reality display system of claim 3, wherein a periodic grating structure formed of nanostructures is disposed in the functional region, the periodic grating structure comprising any one or more of a tilted grating, a volume grating, or a rectangular grating.
5. The augmented reality display system of claim 2, wherein the filter layer is disposed between the incoupling regions of the two diffractive waveguide lenses.
6. The augmented reality display system of claim 1, wherein the filter layer filters light in a manner selected from any one of selective transmission, reflection, or absorption.
7. The augmented reality display system of claim 1, wherein the filter layer is selected from any one of a soft film, a thin glass coating, or a color photoresist.
8. The augmented reality display system of claim 1, wherein the filter layer and the diffractive waveguide lens are connected by an adhesive.
9. The augmented reality display system of any one of claims 1 to 8, wherein the augmented reality display system comprises a first diffractive waveguide optic, a second diffractive waveguide optic, and a filter layer disposed between the first and second diffractive waveguide optics.
10. The augmented reality display system of claim 9, wherein the filter layer is configured to block green light and transmit magenta light.
11. The augmented reality display system of claim 9, wherein the filter layer is configured to block magenta light and transmit green light.
12. The augmented reality display system of any one of claims 1 to 8, comprising a first diffractive waveguide optic, a second diffractive waveguide optic, a third diffractive waveguide optic, a first optical filter disposed between the first and second diffractive waveguide optics, and a second optical filter disposed between the second and third diffractive waveguide optics.
13. The augmented reality display system of claim 12, wherein the first filter layer is configured to block green light and transmit red and blue light, the second filter layer is configured to block red light and transmit blue light, or the second filter layer is configured to block blue light and transmit red light.
14. The augmented reality display system of claim 12, wherein the first filter layer is configured to block blue light and transmit red and green light, the second filter layer is configured to block red light and transmit green light, or the second filter layer is configured to block green light and transmit red light.
15. The augmented reality display system of claim 12, wherein the first filter layer is configured to block red light and transmit blue light and green light, the second filter layer is configured to block blue light and transmit green light, or the second filter layer is configured to block green light and transmit blue light.
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| CN201910776073.2A CN112415744A (en) | 2019-08-22 | 2019-08-22 | Augmented reality display system |
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| CN201910776073.2A CN112415744A (en) | 2019-08-22 | 2019-08-22 | Augmented reality display system |
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| CN114563873A (en) * | 2022-01-26 | 2022-05-31 | 业成科技（成都）有限公司 | Optical assembly and display device |
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Application publication date: 20210226 |