CN210166574U - Augmented reality display system - Google Patents
Augmented reality display system Download PDFInfo
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- CN210166574U CN210166574U CN201921365239.3U CN201921365239U CN210166574U CN 210166574 U CN210166574 U CN 210166574U CN 201921365239 U CN201921365239 U CN 201921365239U CN 210166574 U CN210166574 U CN 210166574U
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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 isolating unnecessary light is arranged between the two diffraction waveguide lenses, and a medium grating is arranged on the filter layer. This augmented reality display system can realize the band light of every piece of diffraction waveguide lens and control alone 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. And moreover, by adjusting the structural parameters of the medium grating, the resonance of the guide film can be excited, so that the adjustment is convenient, and the high-efficiency light filtering effect is achieved.
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 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.
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 isolating unnecessary light is arranged, the filter layer is arranged between the two diffraction waveguide lenses, and the filter layer is provided with a medium grating.
Further, the filter layer includes a substrate, a dielectric layer disposed on the substrate, and the dielectric grating disposed on the dielectric layer.
Further, the substrate is selected from any one of quartz, K9 glass, poly terephthalic plastic, acryl or polydimethylsiloxane.
Furthermore, the dielectric layer is made of silicon nitride materials, and the thickness of the dielectric layer is 50-200 nm.
Furthermore, the medium grating is made of silicon materials, the period of the medium grating is 250-400 nm, the duty ratio is 0.4-0.6, and the height is 30-70 nm.
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 region, and the periodic grating structure comprises any one 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 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 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 separate the incidence of unnecessary light, after image light passes through preceding diffraction waveguide lens, the image light that the part is not totally coupled in is isolated by the medium grating 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 moreover, by adjusting the structural parameters of the medium grating, the resonance of the guide film can be excited, so that the adjustment is convenient, and the high-efficiency light filtering effect is achieved.
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 diagram of a filter layer in an augmented reality display system according to a second embodiment of the present invention;
fig. 5 is a diffraction efficiency diagram of a filter layer in an augmented reality display system according to the second embodiment of the present invention;
fig. 6 is a schematic structural diagram of a first diffractive waveguide lens in an augmented reality display system according to a second embodiment of the present invention;
fig. 7 is a flow chart of a manufacturing process of a filter layer in the augmented reality display system according to 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 to 4, 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, the filter layer 2-3 is provided with a medium grating 2-31, and unnecessary light isolation is realized through optical diffraction.
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. Indeed, in other embodiments, a three-zone or multi-zone diffractive waveguide lens may also be employed.
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. Part of the image light which is not completely coupled in is isolated from entering the second diffractive waveguide lens 2-2 after passing through the filter layer 2-3. While the remaining wavelength band light suitable for the second diffractive waveguide lens 2-2 continues to be coupled in via the lens, guided and guided 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. 4, in the present embodiment, the filter layer 2-3 includes a substrate 2-32, a dielectric layer 2-33 disposed on the substrate 2-32, and a dielectric grating 2-31 disposed on the dielectric layer 2-33, and the dielectric grating 2-31 is a sub-wavelength dielectric grating. Wherein, by designing the structural parameters of the filter layer 2-3, the guided-mode resonance can be excited, and the guided-mode resonance is usually represented by abnormal reflection or transmission of the dielectric grating 2-31, i.e. when the wavelength of incident light, the incident angle or the grating structural parameters slightly change, the transmission rate or the reflection rate abnormally changes. The occurrence of guided mode resonance is that the grating structure can be regarded as a periodically modulated planar waveguide, when the transverse propagation wave vector of the higher order diffracted wave is the same as the guided mode propagation constant supported by the grating waveguide, the diffracted wave is coupled into a guided wave, and the guided wave is further modulated by the grating in the transmission process to generate a leakage mode, thereby causing energy redistribution. When the grating period is less than the wavelength of the incident wave, only 0-order propagating waves exist in the air. Thus for a sub-wavelength grating, guided mode resonance only affects the reflected wave and the 0 th order transmitted wave. Under the resonance condition, the waveguide grating generates total reflection, and the light wave cannot penetrate through the grating, but as long as the resonance condition is slightly deviated, the reflectivity of the light wave is rapidly reduced and is reduced to zero. By using the guided mode resonance effect, a narrow band reflection/transmission filter device can be realized.
In the utility model, the substrate 2-32 can be made of quartz, K9 glass, poly terephthalic acid plastic, acryl or polydimethylsiloxane and other soft and hard substrates. The dielectric layers 2-33 are made of silicon nitride materials and have a thickness of 50-200 nm. The medium grating 2-31 is made of silicon material, the grating period of the medium grating 2-31 is 250-400 nm, the duty ratio is 0.4-0.6, and the height is 30-70 nm. By designing the structural parameters of the filter layers 2-3, the waveguide film can be excited to resonate, and high-efficiency filtering is realized.
In one embodiment, the substrate 2-32 is acrylic, the dielectric layer 2-33 has a thickness of 90nm, the grating period of the dielectric grating 2-31 is 309nm, the duty cycle is 0.5, and the height is 44 nm. Referring to fig. 5, fig. 5 is a diffraction efficiency curve under the above parameters. It can be seen that, at the wavelength of 520nm, the transmission efficiency is zero, which means that the filter layer 2-3 strictly blocks the light with wavelength of 520nm from passing through; and the transmissivity of the filter layer 2-3 in the representative red band (about 600nm wavelength) and the blue band (about 450nm wavelength) is more than 90%, which means that the filter layer 2-3 does not block the light in the other bands, and the filter layer 2-3 has a good filtering function. The utility model discloses an above-mentioned filter layer 2-3 design can realize the strict interception of the green interference light of part through first diffraction waveguide lens, and the red and blue wave band light high efficiency that need the coupling second diffraction waveguide lens passes through, can avoid the chromatic dispersion, promotes display quality. In other embodiments, the blocking of light in red and blue bands can also be achieved by the parameter design of the filter layer.
Example two
Referring to fig. 6, in the embodiment, the other structure of the augmented reality display system of the present invention is the same as that of the first embodiment, except that the diffractive waveguide lens 3-1 in the first embodiment adopts a three-region type diffractive waveguide lens as shown in the figure, specifically, the diffractive waveguide lens 3-11 includes a lens body 3-10, a coupling-in region 3-11, a turning region 3-12 and a coupling-out region 3-13 disposed on the lens body 3-10. The incident image light is coupled to the diffraction waveguide lens 3-1, firstly enters the coupling-in area 3-11, 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 3-13, and is output to human eyes by the diffraction of the nano structure. The image light enters from the waveguide lens coupling-in area 3-11, is conducted to the coupling-out area 3-13 through the turning area 3-12 and exits from the coupling-out area 3-13, and therefore the expansion of the field of view in the horizontal direction and the vertical direction is achieved.
Referring to fig. 7, in the above embodiment, the filter layer of the present invention can be prepared by the following preparation method:
s1, selecting a proper substrate, such as quartz, K9 glass, poly terephthalic acid plastic, acryl or polydimethylsiloxane, and plating a silicon nitride material layer on the substrate.
S2, spin coating a photoresist on the basis of the first step.
And S3, preparing a grating pattern on the photoresist by using an interference exposure technology.
S4, a layer of silicon is evaporated on the photoresist grating pattern.
And S5, soaking the substrate in acetone and other solution for ultrasonic treatment, and stripping the photoresist to form the filter layer with the dielectric grating.
In the above embodiments, only 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 separate the incidence of unnecessary light, after image light passes through preceding diffraction waveguide lens, the image light that the part is not totally coupled in is isolated by the medium grating 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 through adjusting medium grating structure parameter, can arouse and lead the membrane resonance, not only adjust conveniently, have high efficiency light filtering effect moreover, compare traditional reflection filtering and absorption filtering, its light 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 (12)
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 isolating unnecessary light is arranged between the two diffraction waveguide lenses, a medium grating is arranged on the filter layer, and the medium grating structure parameters are adjusted to excite the guide film to resonate.
2. The augmented reality display system of claim 1, wherein the filter layer comprises a substrate, a dielectric layer disposed on the substrate, and the dielectric grating disposed on the dielectric layer.
3. The augmented reality display system of claim 2, wherein the substrate is selected from any one of quartz, K9 glass, poly-terephthalic plastic, acryl or polydimethylsiloxane.
4. The augmented reality display system of claim 2, wherein the dielectric layer is a silicon nitride material, and the thickness of the dielectric layer is 50nm to 200 nm.
5. The augmented reality display system of claim 2, wherein the dielectric grating is a silicon material, the period of the dielectric grating is 250-400 nm, the duty cycle is 0.4-0.6, and the height is 30-70 nm.
6. 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.
7. The augmented reality display system of claim 6, wherein the functional region further comprises a turning region for changing a direction of propagation of the image light within the diffractive waveguide lens.
8. The augmented reality display system of claim 7, wherein a periodic grating structure formed of nanostructures is disposed in the functional region, the periodic grating structure comprising any one of a tilted grating, a volume grating, or a rectangular grating.
9. The augmented reality display system of claim 8, wherein the filter layer is disposed between the incoupling regions of the two diffractive waveguide lenses.
10. The augmented reality display system of claim 1, wherein the filter layer and the diffractive waveguide lens are connected by an adhesive.
11. The augmented reality display system of any one of claims 1 to 10, 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.
12. The augmented reality display system of claim 11, wherein the filter layer is configured to block green light and transmit magenta light.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111722317A (en) * | 2020-07-14 | 2020-09-29 | 北京至格科技有限公司 | Diffraction light waveguide lens |
| WO2021197100A1 (en) * | 2020-03-28 | 2021-10-07 | 华为技术有限公司 | Augmented reality device |
| WO2022160825A1 (en) * | 2021-01-26 | 2022-08-04 | 华为技术有限公司 | Optical diffractive device and terminal device |
-
2019
- 2019-08-22 CN CN201921365239.3U patent/CN210166574U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021197100A1 (en) * | 2020-03-28 | 2021-10-07 | 华为技术有限公司 | Augmented reality device |
| CN111722317A (en) * | 2020-07-14 | 2020-09-29 | 北京至格科技有限公司 | Diffraction light waveguide lens |
| WO2022160825A1 (en) * | 2021-01-26 | 2022-08-04 | 华为技术有限公司 | Optical diffractive device and terminal device |
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