CN210166573U - Augmented reality display system - Google Patents
Augmented reality display system Download PDFInfo
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- CN210166573U CN210166573U CN201921365209.2U CN201921365209U CN210166573U CN 210166573 U CN210166573 U CN 210166573U CN 201921365209 U CN201921365209 U CN 201921365209U CN 210166573 U CN210166573 U CN 210166573U
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Abstract
The utility model relates to an augmented reality display system, it includes: 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 deflecting the unwanted light is provided, which filter layer is arranged between the two diffractive waveguide lenses and is provided with diffractive optical structures. This augmented reality display system can realize the band light independent control of every piece of diffraction waveguide lens through set up the filter layer between per two diffraction waveguide lenses to eliminate light and go into in disorder, avoid light crosstalk, cause phenomenons such as image colour difference ghost, promote and experience the comfort level, the utility model discloses an augmented reality display system adopts the filter layer of diffraction type optical structure to make unnecessary light produce the deflection, and its filtering characteristic is more excellent.
Description
Technical Field
The utility model relates to an augmented reality display system belongs to optics technical field.
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 with weak efficiency in the second diffractive waveguide lens 1-2 and the third diffractive waveguide lens 1-3 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.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an augmented reality display system, it is through laminating the filter layer between diffraction waveguide lens, eliminates the indiscriminate income of light, crosstalks, promotes and experiences the comfort level.
In order to achieve the above purpose, the utility model provides a 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;
and at least one filter layer for deflecting the unwanted light is provided, the filter layer being disposed between the two diffractive waveguide lenses, the filter layer being provided with a diffractive optical structure.
Further, the functional region includes two, three or more kinds of coupling-in regions and coupling-out regions, and the coupling-in regions and the coupling-out regions 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.
Further, the periodic grating structure includes 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.
Furthermore, the filtering mode of the filter layer is diffraction type light deflection.
Further, the filter layer is selected from any one of a tilted grating, a volume grating, a blazed grating, or a diffractive optical element.
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 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.
Further, the light source includes an LED, a laser, an LCD, or an OLED, etc.
Compared with the prior art, the beneficial effects of the utility model reside in that: the utility model discloses an augmented reality display system sets up the filter layer through laminating between two diffraction waveguide lenses for make unnecessary light produce light deflection, after image light passes through preceding diffraction waveguide lens, the partial image light that does not totally couple in takes place the diffraction deflection behind the filter layer, can't get into next diffraction waveguide lens, realizes that light filters. Therefore, this augmented reality display system can realize the band light independent control of every piece of diffraction waveguide lens through set up the filter layer between per two diffraction waveguide lenses to eliminate light and go into in disorder, avoid light to crosstalk, cause phenomenons such as image colour difference ghost, promote the experience comfort level, the utility model discloses an augmented reality display system adopts the filter layer of diffraction type optical structure to make unnecessary light produce the deflection, and its filtering characteristic is more excellent.
The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and 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 a first embodiment of the present 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 structural view of a diffractive waveguide lens as shown in other non-illustrated embodiments of the present invention;
FIG. 5 is a schematic diagram illustrating the operation of a tilted grating in the augmented reality display system shown in FIG. 2;
fig. 6 is a schematic diagram illustrating an operating principle of a blazed grating in the augmented reality display system according to the second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a diffractive optical element in an augmented reality display system according to a third embodiment of the present invention;
FIG. 8 is a schematic diagram of the operation of the diffractive optical element shown in FIG. 7;
fig. 9 is a schematic structural diagram of an augmented reality display system shown in the fourth embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to 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 such as "upper", "lower", "left", "right", "inner" and "outer" of the present invention are described with reference to the drawings, and are not intended to be limiting terms.
Example one
Referring to fig. 2, fig. 3 and fig. 5, 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. And a filter layer 2-3 is arranged between the first diffraction waveguide lens 2-1 and the second diffraction waveguide lens 2-2, a diffraction type optical structure 2-31 is arranged on the filter layer 2-3, and light deflection of unnecessary light is realized through optical diffraction, so that the unnecessary light cannot enter the second diffraction 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 structure diffraction, is conducted to the coupling-out area 13, and is output to human eyes by the nano structure diffraction. 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 arranged between the second incoupling zone 2-21 and the first diffractive waveguide lens 2-1 to ensure its filtering effect. The 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 one wave band light suitable for the first diffractive waveguide lens 2-1 is coupled in and conducted through the lens and is led out in the first coupling-out area 2-12. After part of the image light which is not completely coupled in passes through the filter layer 2-3, light diffraction deflection is generated, so that the 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. This kind of design makes the utility model discloses an augmented reality display system can realize the waveband light independent control of every lens, avoids the production of phenomena such as light crosstalk and image colour difference ghost.
As shown in fig. 5, in the present embodiment, the diffraction optical structures 2 to 31 of the filter layers 2 to 3 are tilted gratings, specifically, when incident light enters the tilted gratings at an angle α, diffracted light exits at an angle β, wherein the diffraction angle depends on the grating period, the incidence angle, and the like, and the tilt angle regulates the diffraction efficiency.
Example two
Please refer to fig. 6, in this embodiment, the other structures of the augmented reality display system of the present invention are the same as the first embodiment, and the difference is that the diffraction type optical structure disposed on the filter layer in this embodiment is a blazed grating, specifically, when the incident light is incident into the blazed grating at an angle α, the diffraction light is emitted at an angle β, by designing the groove spacing and the blazed angle of the blazed grating, the blazed grating can realize that the specific wavelength generates the maximum diffraction efficiency at the specific diffraction order, and at the other orders, especially the zero order, the diffraction efficiency is the lowest.
EXAMPLE III
Referring to fig. 7 and 8, in the embodiment, other structures of the augmented reality display system of the present invention are the same as the first embodiment, except that the diffractive optical structure disposed on the filter layer in the first embodiment is a diffractive optical element, specifically, the diffractive optical element is also called a binary optical element, according to a general formula for calculating the diffraction efficiency of the binary optical element:
wherein N is the number of steps of the binary optical element, and m is the diffraction order. In a common diffraction grating, the zero-order diffraction efficiency occupies a large total energy ratio. The binary optical element can control the depth and size of the structure, so that when the diffracted light under the incidence of a specific wavelength is m equal to 0, namely the diffraction order is zero-order, the diffraction efficiency is 0, namely the zero-order diffracted light is completely eliminated, and the energy is mainly concentrated on the positive and negative first-order and higher-order diffracted light. The utility model discloses a filter layer adopts the design of diffraction optical element, can realize the zero order diffraction to specific wavelength light extinction, and all the other orders are with certain angle diffraction, can not produce light interference to next layer lens.
Example four
Referring to fig. 9, 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 deflecting 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, the first filter layer 3-4 is disposed between the second incoupling area 3-21 and the first diffractive waveguide lens 3-1, and the second filter layers 3-5 are disposed between the third incoupling area 3-31 and the second diffractive waveguide lens 3-2, respectively, to ensure the filtering effect thereof. Image light rays of three wave bands emitted from the light source are incident to the first diffraction waveguide lens 3-1 in a certain direction, and the wave band light rays suitable for the first diffraction waveguide lens 3-1 are coupled in and conducted through the lens and are led out in the first coupling-out area 3-12. After part of the light which is not completely coupled into the first diffractive waveguide lens 3-1 passes through the first filter layer 3-4, light diffraction deflection is generated, so that the light cannot enter the second diffractive 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. After part of the light which is not completely coupled into the second diffraction waveguide lens 3-2 passes through the second filter layer 3-5, light diffraction deflection is generated, so that 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. This design makes the utility model discloses an augmented reality display system can realize the wave band light independent control of every lens, avoids light to crosstalk, causes phenomenons such as image colour difference ghost.
In this embodiment, the diffractive optical structures (not shown) on the first filter layer 3-4 and the second filter layer 3-5 are diffractive optical elements, which may be tilted gratings, volume gratings or blazed gratings, for example.
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: the utility model discloses an augmented reality display system sets up the filter layer through laminating between two diffraction waveguide lenses for make unnecessary light produce light deflection, after image light passes through preceding diffraction waveguide lens, the partial image light that does not totally couple in takes place the diffraction deflection behind the filter layer, can't get into next diffraction waveguide lens, realizes that light filters. Therefore, the augmented reality display system can realize independent control of the wave 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 light crosstalk is avoided, the image chromatic aberration ghost and the like are caused, and the experience comfort level is improved. And, compare in the mode that adopts reflection filtering and absorption extinction to filter light, the utility model discloses an augmented reality display system adopts the filter layer of diffraction type optical structure to make unnecessary light produce the deflection, and its filtering characteristic is more excellent.
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 represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
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;
and at least one filter layer for deflecting the unwanted light is provided, the filter layer being disposed between the two diffractive waveguide lenses, the filter layer being provided with a diffractive optical structure.
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 the functional region is provided with a periodic grating structure formed by nano-structures, including any one or more of a tilted grating, a volume grating or a rectangular grating.
5. The augmented reality display system of claim 1, 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 diffractive light deflection.
7. The augmented reality display system of claim 1, wherein the filter layer is selected from any one of a tilted grating, a volume grating, a blazed grating, or a diffractive optical element.
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 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.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116344572A (en) * | 2023-05-30 | 2023-06-27 | 季华实验室 | Micro LED structure and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116344572A (en) * | 2023-05-30 | 2023-06-27 | 季华实验室 | Micro LED structure and preparation method thereof |
| CN116344572B (en) * | 2023-05-30 | 2023-08-11 | 季华实验室 | Micro LED structure and preparation method thereof |
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