CN217821113U - Augmented reality head-up display system and vehicle - Google Patents
Augmented reality head-up display system and vehicle Download PDFInfo
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- CN217821113U CN217821113U CN202222180603.7U CN202222180603U CN217821113U CN 217821113 U CN217821113 U CN 217821113U CN 202222180603 U CN202222180603 U CN 202222180603U CN 217821113 U CN217821113 U CN 217821113U
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Abstract
The utility model provides an augmented reality head-up display system and vehicle, include: a light source, a spatial light modulator, a tunable achromatic superlens, and an image combiner. The light source is configured to emit light at a plurality of discrete wavelengths; the spatial light modulator is configured to load a computer hologram to perform wavefront modulation on light emitted by the light source to generate a three-dimensional image; the adjustable achromatic superlens adjusts the position of the three-dimensional image surface according to the position of the actual interactive scene; the image combiner is used for superposing the information of the three-dimensional image and the external ambient light information. The utility model provides an augmented reality head-up display system and vehicle introduces adjustable achromatism and surpasses lens, utilizes the advantage of its small, the structure is simple, easy volume production, realizes full-color and many image planes in the augmented reality head-up display system and shows.
Description
Technical Field
The utility model relates to an image display technical field particularly, relates to an augmented reality head-up display system and vehicle.
Background
Head-up displays (HUDs) are transparent displays that present information in front of the eyes of a user, and augmented reality head-up displays (AR-HUDs) use augmented reality technology to give the user a feeling of being personally on the scene, such as laying a virtual guide path on a road, highlighting a notable pedestrian, attaching an interesting label to the presented information on a roadside structure, and the like. Compared with a head-up display, the augmented reality head-up display has better intuitiveness, usability and safety.
In the existing augmented reality head-up display system, the image has single color, which affects the user experience. In addition, since the user can see the virtual information only at a specific position at the same time, the visual comfort is low, and there is a need to further increase the eye movement range.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, an object of the embodiments of the present invention is to provide an augmented reality head-up display system and a vehicle.
In a first aspect, an embodiment of the present invention provides an augmented reality head-up display system, having a real image light path and a virtual image light path, and the virtual image light path includes in proper order: a light source, a spatial light modulator, an adjustable achromatic superlens, and an image combiner;
the light source is configured to emit light at a plurality of discrete wavelengths;
the spatial light modulator is configured to load a computer hologram to perform wavefront modulation on light emitted by the light source to generate a three-dimensional image;
the adjustable achromatic superlens is configured to focus light exiting from the spatial light modulator onto the same corresponding image plane, and is capable of adjusting a position of the corresponding image plane.
In one possible implementation, the augmented reality heads-up display system further includes a beam splitting device;
the beam splitting device is disposed between the adjustable achromatic superlens and the image combiner in the virtual image optical path.
In one possible implementation, the real image beam path and the virtual image beam path are partially separated from each other.
In one possible implementation, the spatial light modulator is a liquid crystal spatial light modulator or a super-surface based spatial light modulator.
In one possible implementation, the phase distribution of the tunable achromatic superlens satisfies:
where n is the number of discrete wavelengths that the light source is capable of emitting, λ is the value of the discrete wavelengths,
for the phase of the discrete wavelength of light, the tunable achromatic superlens comprising: a substrate and a nanostructure, f is the initial focal length of the adjustable achromatic superlens, and delta f is the adjustable achromatic superlensThe amount of change in focal length of; and x and y are coordinates from the center of the adjustable achromatic superlens to any one of the nanostructures.
In one possible implementation, the adjustable chromatic super lens is configured to adjust the position of the corresponding image plane by adjusting the phase thereof through an external excitation.
In one possible implementation, the applied excitation includes electrical control, optical control, and mechanical regulation.
In one possible implementation, the image combiner includes a waveguide-type image combiner or a freeform image combiner.
In one possible implementation, the beam splitting apparatus comprises a beam splitter apparatus made up of a plurality of super-surface beam splitters.
In a second aspect of the present invention, there is provided a vehicle, including: according to the utility model discloses an augmented reality head-up display system, the light that augmented reality head-up display system sent is through behind the windshield reflection of vehicle, the reverse extension line of the light of reflection can be gathered on a plurality of focal planes.
In the embodiment of the present invention, in the solution provided by the first aspect, the adjustable achromatic superlens is adopted, and the advantages of small volume, simple structure and easy mass production are utilized to realize full-color and multi-image-plane display in the augmented reality head-up display system; meanwhile, the super-surface beam splitter is adopted, so that the eye movement range of the augmented reality head-up display system is enlarged, and the visual comfort of human eyes is improved.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 shows a schematic diagram of the overall structure of one embodiment of an augmented reality head-up display system provided by the present invention (a scheme using achromatic superlens);
fig. 2 shows a schematic diagram of the overall structure of another embodiment of the augmented reality head-up display system provided by the present invention (using an achromatic superlens, a beam splitting device);
FIG. 3 illustrates a block diagram of one embodiment of a tunable achromatic superlens 30 according to the present invention;
FIG. 4 illustrates a block diagram of another embodiment of a tunable achromatic superlens 30 according to the present invention;
FIG. 5 illustrates a block diagram of adjustable achromatic superlens 30 provided by an embodiment of the present invention;
FIG. 6 illustrates a block diagram of nanostructures in adjustable achromatic superlens 30 according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of light rays provided by an embodiment of the present invention as the adjustable achromatic superlens 30 is adjusted in focal length;
FIG. 8 illustrates a schematic diagram of a distribution of nanostructures in a tunable achromatic superlens 30 provided by an embodiment of the present invention;
fig. 9 shows another distribution diagram of nanostructures in tunable achromatic superlens 30 according to an embodiment of the present invention.
List of reference numbers:
10-light source, 12-three-dimensional image, 20-spatial light modulator, 30-adjustable achromatic superlens, 31 and first electrode; 32. a second electrode; 33. a nanostructure; 34. a connection layer; 35. a first insulating layer; 36. a second insulating layer; 37. a filler; 301-substrate, 302-nanostructure two, 303-phase change material layer, 304-first electrode layer, 305-second electrode layer, 40-image combiner, 50-beam splitting device.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Based on the dispersion principle of the superlens, the superlens can present different corresponding focal lengths to different wavelengths, and multi-image-plane image display is achieved. However, the image of each image plane generated in the above manner is of a single color, which affects user experience; further, since it is preferable that the user can see the virtual information only at a specific position at the same time, visual comfort is low, and there is a demand for further increasing the range of eye movement.
In view of the above, the present application provides an augmented reality head-up display system capable of color display and a vehicle.
Example 1
Referring to fig. 1, an embodiment of the present invention provides an augmented reality head-up display system, including: a light source 10, a spatial light modulator 20, an adjustable achromatic superlens 30 and an image combiner 40; the light source 10 is for emitting light of a discrete wavelength. In the embodiments of the present application and various alternative embodiments, the light source 10 may be an LED light source and a narrow-band filter, or may be a fiber-coupled laser, where light with discrete wavelengths is output from an output end of the fiber-coupled laser.
The spatial light modulator 20 is disposed downstream of the light source 10 on the virtual image optical path, and a computer hologram may be loaded on the spatial light modulator 20 by the control device, and the incident imaging light may be wavefront-modulated by the spatial light modulator 20 to have depth information, thereby generating the three-dimensional image 12. Here, a spatial light modulator is an element that modulates the optical field distribution of an optical wave, and such element can change the amplitude or intensity, phase, polarization state, and wavelength of the spatial light distribution or convert incoherent light into coherent light under the control of a time-varying electric drive signal or other signals. Therefore, the spatial light modulator can be used as a construction unit or a key device in systems such as real-time optical information processing, optical computation, optical neural networks and the like. In the present and alternative embodiments, spatial light modulator 20 may be a liquid crystal spatial light modulator, which may include a layer of liquid crystal material disposed between two walls having electrodes to form a liquid crystal cell (cell). The liquid crystal material is switched (switch) by applying an electrical waveform to the electrodes. One characteristic of liquid crystal materials is that they deteriorate under the influence of a long-term DC voltage. A Spatial Light Modulator (SLM) system is designed such that the liquid crystal material is maintained at a net zero DC voltage and such that the driving scheme used to address the SLM system results in DC balancing. A net zero voltage can be maintained for a reasonable period of time of a few seconds. Furthermore, it is also contemplated that the spatial light modulator is a super-surface based spatial light modulator.
Adjustable achromatic superlens 30 is disposed downstream of spatial light modulator 20 in the virtual image optical path. Tunable achromatic superlens 30 has the same focal length for different wavelengths of light, which allows discrete wavelengths of light to converge on the same focal plane. During operation of tunable achromatic superlens 30, the focal length of the tunable achromatic superlens can be changed by applying an excitation, thereby changing the position of the image plane and presenting a color three-dimensional image to the user.
In the present embodiment and in various alternative embodiments, adjustable achromatic superlens 30 includes: the nano-structure unit is arranged on the surface of the substrate 300, the nano-structure units are arranged in an array and can be a regular hexagon, and at least one nano-structure 31 is arranged at each vertex and the center of the regular hexagon. Ideally, the nanostructure units should be the nanostructures 31 arranged at the vertices and the centers of a hexagon or the nanostructures 31 arranged at the vertices and the centers of a square, and it should be understood that the actual product may have the loss of the nanostructures 31 at the edges of the superlens due to the limitation of the superlens shape, so that the complete hexagon/square is not satisfied. Specifically, as shown in fig. 5, the nanostructure units are regularly arranged by the nanostructures, and a plurality of nanostructure units are arranged in an array to form a nanostructure film. The nanostructure has high transmittance in the visible light band, and the material can be: titanium oxide, silicon nitride, fused silica, aluminum oxide, gallium nitride, gallium phosphide, hydrogenated amorphous silicon, and the like; referring to fig. 6, the nanostructures may be filled with air or other transparent or semitransparent material with an operating optical band, and the absolute value of the difference between the refractive index of the material and the refractive index of the nanostructures is greater than or equal to 0.5. The nano-structure can be a polarization-dependent structure, such as a nano-fin, a nano-elliptic cylinder and the like, and the structure exerts a geometric phase on incident light; the nanostructures may also be polarization-independent structures, such as nanocylinders and nanosquares, which impart a propagation phase to incident light.
As an example shown in the left part of fig. 5, the nanostructure unit includes a central nanostructure 31 surrounded by 6 peripheral nanostructures 31 with equal distance, and each peripheral nanostructure 31 is uniformly distributed on the circumference to form a regular hexagon, which can also be understood as a regular triangle formed by a plurality of nanostructures 31.
In one embodiment, shown in the middle of fig. 5, the nanostructure element comprises a central nanostructure 31 surrounded by 4 peripheral nanostructures 31 spaced equally apart, forming a square.
The nanostructure elements and their close-packed/arrayed pattern may also be in the form of a circular array of sectors, as shown in the right part of fig. 5, including two arcuate sides, or in the form of a sector with one arcuate side, as shown in the lower left-hand corner region of the right part of fig. 5. At the intersection of the sides of the sector and in the centre, a nanostructure 31 is arranged.
The adjustable achromatic superlens 30 has the same corresponding focal length for light rays of different wavelengths, and in order to adjust the position of the image plane of the three-dimensional image 12, as shown in fig. 7, when the focal length is f1, the light ray diagram is shown in the upper part of fig. 7, and when the adjustable achromatic superlens is adjusted to increase the focal length to f2, the light ray diagram is shown in the lower part of fig. 7.
To achieve achromatization, the phase distribution of the tunable metasurface for a single wavelength satisfies:
wherein λ is a wavelength, and f is a focal length corresponding to the corresponding wavelength.
Thus, in the present application, adjustable achromatic superlens 30 can be achromatic for discrete wavelengths of light emitted by the light source, and thus have the same corresponding focal length, which is obtained by designing the phase distribution of adjustable achromatic superlens 30 for a plurality of wavelengths of light according to the above formula, if there are n different wavelengths, the phase distribution of adjustable achromatic superlens 30 should satisfy:
where n is the number of discrete wavelengths that the light source is capable of emitting, λ is the value of the discrete wavelengths,
f is the phase of the discrete wavelength light, f is the initial focal length of the adjustable achromatic superlens 30, and Δ f is the amount of change in the focal length of the adjustable achromatic superlens 30; x, y are the coordinates of the center of the tunable achromatic superlens 30 to any of the nanostructures 301
Alternatively to the design of the nanostructures of the superlens, in one embodiment, the nanostructures satisfying equation 2 can be directly searched from the nanometer database;
in addition, in another embodiment, referring to fig. 8, if the number of discrete wavelengths emitted by the light source 10 is m, and each of the nanostructures mainly receives light of a desired wavelength, the number of units of the super-surface structure can be divided into m, and the adjustable achromatic super lens 30 can be divided into m regions, and each region is provided with one of the nanostructures. As shown in FIG. 9, the nanostructures (shown as filled circles in FIG. 8) in the first region of tunable achromatic superlens 30 are capable of receiving light at a wavelength λ 1 The nanostructures in the second region (indicated by triangles in fig. 8) are capable of receiving light having a wavelength λ 2 The nanostructures in the third region (indicated by open circles in fig. 8) are capable of receiving light at a wavelength λ 3 The light ray of (8230) \\8230
In order to receive all of the desired wavelengths of light, a plurality of nanostructures are required, with different types of nanostructures being capable of receiving different at least one desired wavelength of light. In this embodiment, the different types of nanostructures may be randomly arranged or staggered so that the tunable achromatic superlens 30 uniformly receives light of different desired wavelengths.
For example, FIG. 9 shows a schematic diagram of randomly arranging different species of nanostructures; in fig. 9, different shapes (triangle, square, open circle, filled circle, etc.) represent different kinds of nanostructures, respectively. Alternatively, the different types of nanostructures may be arranged in concentric circles or in columnsThe equal staggered arrangement; for example, the concentric circles are arranged from the inside to the outside in order to converge at a wavelength λ 1 、λ 2 、…、λ m The (m + 1) th to (2) th concentric circles are sequentially capable of converging the wavelength of lambda 1 、λ 2 、…、λ m The nanostructure of (1). And (3) arranging the nano structures in a staggered manner to obtain a large adjustable achromatic superlens.
In order to realize the adjustable function of the achromatic superlens, the adjustable achromatic superlens can adopt a voltage regulation and control mode. The adjustable super lens is provided with a regulating voltage, the nano structure unit of the adjustable super lens adopts a phase change material, and the phase change material can change the dielectric constant greatly by changing the crystal lattice in the substance under the action of external excitation (such as heat, laser and external voltage).
GST, which is a commonly used phase change material composed of three elements of germanium (Ge), antimony (Sb) and tellurium (Te), is widely used in rewritable optical disc technology. The solid GST has a crystalline state and an amorphous state, and the dielectric constants of the two states are greatly different.
When the temperature of the amorphous GST exceeds the crystallization temperature (at most 160 ℃), the amorphous phase is first transformed into a metastable face-centered cubic crystal structure, similar to NaCl. If the temperature continues to rise, the metastable crystal structure may change to a stable hexagonal structure. The phase transition from the amorphous state to the crystalline state can be achieved by placing GST on a heating plate and heating, using laser pulse irradiation, applying voltage, and the like.
On the other hand, crystalline GST is liquefied by heating it to a temperature exceeding its melting point (at most 640 ℃ C.), and then rapidly cooled to form amorphous GST. The whole cooling solidification process needs to be rapidly completed within 10ns, and if the solidification time is too long, the liquid GST has enough time to be recombined into a crystalline structure. In the case of a laser, the phase change of GST from crystalline to amorphous state often requires a relatively powerful short pulse (pulse width <10 ns) laser.
Once the phase change process of the GST crystalline or amorphous state is completed, the GST can maintain the crystalline or amorphous state after the phase change for a long time even if the external stimulus is removed and the environment returns to room temperature. The crystallization ratio of GST can be obtained by controlling physical parameters of the crystallization process, for example, heating the amorphous GST, and the crystallization ratio can be controlled by changing the heating temperature or heating time to obtain different refractive indexes.
A schematic diagram of one nanostructure 33, i.e. phase change cell, of the tunable superlens of the present application is shown in (1) and (2) of fig. 3. Here, the phase change cell is a transmissive phase change cell. Conduction and heating can be achieved directly with the phase change element. As shown in (1) of fig. 3, the first electrode 31 is electrically connected to the lower side of the nanostructure 33, and the second electrode 32 is electrically connected to the upper side of the nanostructure 33. Under the action of the two electrodes, the nano structure 33 made of the phase change material directly conducts electricity and generates heat, and the change of phase change state is realized. Here, the materials of the first electrode 31 and the second electrode 32 are transparent in the operating band to avoid reducing the transmittance of light.
Here, the second electrode 32 may be directly electrically connected to the nanostructure 33; alternatively, as shown in (1) of fig. 3, the phase change cell further includes: a connecting layer 34, and the connecting layer 34 is transparent in the operating band. The connecting layer 34 is located on the side of the nanostructure 33 away from the first electrode 31, and is electrically connected to the nanostructure 33; the second electrode 32 is located between the first electrode 31 and the connection layer 34, and is electrically connected to the connection layer 34. In this embodiment, the first electrode 31 and the connection layer 34 are made of a conductive and transparent material, for example, ITO.
For example, in order to avoid the leakage between the first electrode 31 and the second electrode 32 which are arranged at intervals, referring to (1) in fig. 3, the phase change cell further includes: a first insulating layer 35; the first insulating layer 35 is located between the first electrode 31 and the second electrode 32, and abuts against the first electrode 31 and the second electrode 32. Optionally, the phase change cell may further include a second insulating layer 36 disposed in parallel with the nanostructures 33, in which case insulation may also be achieved where partial electrodes can be supported. As shown in fig. 4, the second insulating layer 36 may function to support the connection layer 34.
Referring to (2) in fig. 3, the phase change cell may also include: a filler 37, the filler 37 being transparent at the operating band; the filler 37 is filled between the nanostructures 33. In this embodiment, the surrounding of the nanostructure 33 is filled with a transparent material, i.e., a filler 37; the filler 37 has a high transmittance in the operating band, and the difference between the refractive index of the filler 37 and the refractive index of the phase change material is not less than 0.5, so as to ensure the modulation effect of the nanostructure 33.
In this embodiment, as shown in (1) and (2) of fig. 3, the phase change cell is of a transmissive type, in which a light ray a is incident to the phase change cell, the phase change cell performs phase modulation on the light ray a, and emits a modulated light ray B, which is a transmitted light.
In another design of the tunable superlens, as shown in fig. 4, the superlens includes a substrate 301, a second nanostructure 302, a phase change material layer 303, a first electrode layer 304, and a second electrode layer 305; a plurality of second nanostructures 302 are arranged on one side of the substrate 301, a first electrode layer 304 is filled around the second nanostructures 302, and the height of the first electrode layer 304 is lower than that of the second nanostructures 302; the phase change material layer 303 is arranged on one side of the first electrode layer 304 far away from the substrate 301, and is filled around the second nanostructure 302, and the sum of the heights of the first electrode layer 304 and the phase change material layer 303 is greater than or equal to the height of the second nanostructure 302; the second electrode layer 305 is disposed on a side of the phase change material layer 303 away from the substrate 301; the first electrode layer 304 and the second electrode layer 305 are used for applying a voltage to the phase change material layer 303, and the phase change material layer 303 can change the phase of the tunable superlens according to the applied voltage.
The tunable superlens not only includes the substrate 301 and the second nanostructure 302, but also selects the phase-change material layer 303 as a filling material to fill around the second nanostructure in a targeted manner, and utilizes the characteristic that the phase-change material layer 303 can change the phase-change state correspondingly after being influenced by a voltage, so as to change the focal length of the tunable superlens, and a first electrode layer 304 and a second electrode layer 305 are adopted to apply a certain voltage to the phase-change material layer 303 filled around the second nanostructure 302, when the phase-change material layer 303 receives the voltage, the phase-change material layer 303 can change the focal length of the tunable superlens, and the focal length at this time is different from the focal length when no voltage is applied.
Alternatively, the phase change material layer 303 can change the refractive index of the phase change material layer 303 when the applied voltage is changed. In the current design, the phase change material layer 303 fills around the second plurality of nanostructures 302 of the superlens, so that when the refractive index of the phase change material layer 303 changes, the focal length of the tunable superlens including the phase change material layer 303 can be changed.
In another embodiment, the adjustable function of the superlens can be achieved by optically controlling, for example, by changing the optical signal applied to the superlens, so as to adjust the superlens to achieve the desired phase distribution.
In another embodiment, the adjustable function of the superlens may be achieved mechanically, for example, by selecting a flexible substrate, and adjusting the phase distribution by changing the period of the superlens through mechanical stretching, and specifically, the adjustable achromatic superlens 30 is configured to: the substrate 300 is made of a stretchable material, the nano structure 31 is fixed on the substrate 300, and the distance between the micro-nano structures on the super lens is changed by stretching or compressing the substrate 300 through external mechanical equipment, so that the period of light passing through the super lens is changed, and the phase of the light is changed.
The image combiner 40 superimposes the virtual information of the three-dimensional image 12 in the virtual image optical path and the ambient light information in the real image optical path, and in this application and various optional embodiments, the image combiner 40 may be a waveguide type image combiner or a free-form surface type image combiner.
Example 2
The present embodiment differs from embodiment 1 in that, referring to fig. 2, the augmented reality head-up display system further includes: a beam splitting device 50;
a beam splitting device 50 is disposed between the adjustable achromatic superlens 30 and the image combiner 40 in the virtual image optical path.
In this embodiment, the beam splitting device 50 is configured to split the imaging light entering from the adjustable achromatic superlens 30 and to enter the image combiner 40, and preferably, the beam splitting device 50 includes a beam splitter device composed of a plurality of super surface beam splitters. The beam splitting device 50 achieves pupil replication using a beam splitter device made up of a plurality of super-surface beam splitters, the beam splitter device comprising: a super-surface beam splitter, and optionally a projection lens unit. After the imaging light is incident on the super-surface beam splitter, the super-surface beam splitter diffracts the incident imaging light, so that the imaging light is split into an image combiner or a projection lens unit.
In one embodiment, the super-surface beam splitter may include a plurality of beam splitting elements arranged in an array (e.g., an m × n array), each beam splitting element being similar to a two-dimensional grating, and the incident light may be diffracted to have different diffraction orders corresponding to different diffraction angles, so as to split the imaging light to different projection lens units. Different projection lens units are positioned at different positions, so that the imaging light rays can be converged to a plurality of different positions, pupil replication is realized, the imaging range of the system is enlarged, and the eye movement range of the system of the augmented reality head-up display is enlarged.
An embodiment of the utility model provides a still provide a vehicle, for example car, aircraft etc. this vehicle includes: the augmented reality head-up display system comprises a windshield and the augmented reality head-up display system provided in any one of the above embodiments, wherein after light emitted by the augmented reality head-up display system is reflected by the windshield of the vehicle, reverse extension lines of the reflected light are converged on a plurality of focal planes.
In the above embodiment and the preferred embodiment, the image generated by the augmented reality head-up display system is colorful, the recognition degree is strong, and the user experience is good; the eye movement range is large, and the visual comfort is high.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the technical solutions of the changes or replacements within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An augmented reality heads-up display system having a real image optical path and a virtual image optical path and comprising in order on the virtual image optical path: a light source (10), a spatial light modulator (20), a tunable achromatic superlens (30) and an image combiner (40);
wherein the light source is configured to emit light at a plurality of discrete wavelengths;
the spatial light modulator (20) is configured to be loaded with a computational hologram to wavefront modulate light from the light source to produce a three-dimensional image (12);
the adjustable achromatic superlens (30) is configured to focus light exiting from the spatial light modulator onto the same corresponding image plane, and to be able to adjust the position of said corresponding image plane;
the image combiner (40) is configured to superimpose virtual information of the three-dimensional image (12) in the virtual image light path and ambient light information in the real image light path.
2. The augmented reality heads-up display system of claim 1 further comprising: a beam splitting device (50);
the beam splitting device (50) is disposed between the adjustable achromatic superlens (30) and the image combiner (40) in the virtual image optical path.
3. The augmented reality heads-up display system of claim 1 or 2 wherein the real image optical path and the virtual image optical path are partially separated from each other.
4. Augmented reality heads-up display system according to claim 1 or 2, characterized in that the spatial light modulator (20) is a liquid crystal spatial light modulator or a super-surface based spatial light modulator.
5. Augmented reality heads-up display system according to claim 1 or 2, characterized in that the adjustable achromatic superlens (30) comprises: a substrate (300), and nanostructures (301), the phase distribution of the tunable achromatic superlens (30) satisfying:
where n is the number of discrete wavelengths that the light source (10) is capable of emitting, and λ is the value of the discrete wavelengths,
f is the phase of the discrete wavelength light, f is the initial focal length of the adjustable achromatic superlens (30), and Δ f is the amount of change in the focal length of the adjustable achromatic superlens (30); x, y are coordinates of the center of the tunable achromatic superlens (30) to any of the nanostructures (301).
6. Augmented reality heads-up display system according to claim 1 or 2, characterized in that the adjustable achromatic superlens (30) is configured to adjust the position of the corresponding image plane by modulating its phase through an external stimulus.
7. The augmented reality heads-up display system of claim 6 wherein the applied stimulus includes electrical control, optical control and mechanical manipulation.
8. Augmented reality heads-up display system according to claim 1 or 2, characterized in that the image combiner (40) comprises a waveguide-type image combiner or a freeform image combiner.
9. Augmented reality heads-up display system according to claim 2 characterized in that the beam splitting means (50) comprises a beam splitter means consisting of a plurality of super surface beam splitters.
10. A vehicle, comprising: the augmented reality heads-up display system of any one of claims 1-9, wherein after light emitted by the augmented reality heads-up display system is reflected by a windshield of the vehicle, opposite extensions of the reflected light converge on multiple focal planes.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US11927769B2 (en) | 2022-03-31 | 2024-03-12 | Metalenz, Inc. | Polarization sorting metasurface microlens array device |
| US11978752B2 (en) | 2019-07-26 | 2024-05-07 | Metalenz, Inc. | Aperture-metasurface and hybrid refractive-metasurface imaging systems |
| US11988844B2 (en) | 2017-08-31 | 2024-05-21 | Metalenz, Inc. | Transmissive metasurface lens integration |
-
2022
- 2022-08-18 CN CN202222180603.7U patent/CN217821113U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11988844B2 (en) | 2017-08-31 | 2024-05-21 | Metalenz, Inc. | Transmissive metasurface lens integration |
| US11978752B2 (en) | 2019-07-26 | 2024-05-07 | Metalenz, Inc. | Aperture-metasurface and hybrid refractive-metasurface imaging systems |
| US11927769B2 (en) | 2022-03-31 | 2024-03-12 | Metalenz, Inc. | Polarization sorting metasurface microlens array device |
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