CN217639903U

CN217639903U - Structured light generator, imaging device and comprehensive screen electronic equipment

Info

Publication number: CN217639903U
Application number: CN202221713146.7U
Authority: CN
Inventors: 朱瑞; 朱健; 郝成龙; 谭凤泽
Original assignee: Shenzhen Metalenx Technology Co Ltd
Current assignee: Shenzhen Metalenx Technology Co Ltd
Priority date: 2022-07-05
Filing date: 2022-07-05
Publication date: 2022-10-21
Anticipated expiration: 2032-07-05

Abstract

The utility model provides a structured light generater, image device and comprehensive screen electronic equipment, wherein, this structured light generater includes: a light source, a first superlens, and a display panel; the light source is used for emitting laser beams; the first super lens is arranged on the light-emitting side of the light source and used for projecting the laser beam into speckles; the light source and the first super lens are arranged on the backlight side of the display panel, and the display panel is transparent in the wavelength range of the laser beams. Through the embodiment of the utility model provides a structured light generater, imaging device and comprehensive screen electronic equipment adopt first super lens to laser beam modulation, can reduce the holistic thickness of this structured light generater greatly, reduce shared installation space, satisfy frivolous demand simultaneously under the condition of realizing higher screen proportion of accounting for, and reduce cost.

Description

Structured light generator, imaging device and comprehensive screen electronic equipment

Technical Field

The utility model relates to a structured light generates technical field, particularly, relates to a structured light generator, image device and comprehensive screen electronic equipment.

Background

With the development of hardware and software, more and more mobile phones are equipped with 3D structured light technology. The functions of the system are not limited to facial recognition, and the system can be used for beautifying and self-shooting, virtual shopping, 3D printing and the like. In order to realize the target of a full screen, a 3D structured light module arranged below the screen can be adopted; however, the lenses adopted by each component in the under-screen 3D structured light module are all traditional lenses, and the lenses are thick, occupy a large installation space, sacrifice the light and thin requirements under the condition of realizing a higher screen occupation ratio, and limit the development of a full-screen mobile phone to the direction of more light and thin.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, an embodiment of the present invention provides a structured light generator, an imaging device, and a full-screen electronic device.

In a first aspect, embodiments of the present invention provide a structured light generator, comprising: a light source, a first superlens and a display panel; the light source is used for emitting laser beams; the first super lens is arranged on the light emitting side of the light source and used for projecting the laser beam into speckles; the light source and the first superlens are arranged on the backlight side of the display panel, and the display panel is transparent in the wavelength range of the laser beams.

Optionally, the display panel is an organic light emitting diode screen.

Optionally, the light source comprises: a single vertical cavity laser; the first superlens is also used for collimating and copying the laser beam.

Optionally, the light source comprises: the laser array comprises a random vertical cavity laser array, wherein the first super lens comprises a plurality of super lenses, and the super lenses can amplify and copy the laser beams.

Optionally, the first superlens is arranged coaxially with the light source; the super lens has a positive focal length for the laser beam, and the exit surface of the vertical cavity laser is located at the object space focal plane of the super lens.

Optionally, the superlenses are arranged in an array of a × B patterns; the values of A and B are both more than or equal to 3.

Optionally, a plurality of superstructure units are arranged on one side surface of the display panel far away from the backlight side; the superstructure units are formed in a close-packable pattern; the center position and/or the vertex position of the close-packed graph are/is provided with a first nano structure respectively; the first nanostructure is divided into four quadrants along a first axis and a second axis, and the projection of the cross-sectional pattern of the first nanostructure in any one of the quadrants on the first axis is the same as the projection on the second axis; the cross-sectional patterns in any one of the quadrants are symmetrical along the first axis and the second axis, respectively, to form a cross-sectional pattern of the first nanostructure; the first axis and the second axis are perpendicular to each other, and the first axis and the second axis are perpendicular to a height direction of the first nanostructure, respectively.

Optionally, the structured light generator further comprises: a beam deflecting element; the beam deflection element is arranged between the light source and the first super lens and used for changing the light path of the laser beam.

Optionally, the first superlens comprises a substrate, a second nanostructure, a phase change material layer, a first electrode layer, and a second electrode layer; a plurality of second nanostructures are arranged on one side of the substrate, the first electrode layer is filled around the second nanostructures, and the height of the first electrode layer is lower than that of the second nanostructures; the phase change material layer is arranged on one side, far away from the substrate, of the first electrode layer and is filled around the second nanostructure, and the sum of the heights of the first electrode layer and the phase change material layer is larger than or equal to the height of the second nanostructure; the second electrode layer is arranged on one side, far away from the substrate, of the phase change material layer; the first electrode layer and the second electrode layer are used for loading voltage to the phase change material layer, and the phase change material layer can change the focal length of the first super lens according to the loaded voltage.

In a second aspect, the embodiment of the present invention further provides an imaging device, including: a structured light generator and camera as described in any of the above; the camera is disposed on a backlight side of a display panel of the structured light generator; the structured light generator is configured to project speckle towards an object, the object being located on a side of the display panel remote from the backlight side; the camera is used for receiving the optical signal reflected by the target and generating an electric signal from the optical signal.

Optionally, the camera comprises: an image sensor and a second superlens; the second super lens is arranged on the backlight side of the display panel and used for receiving the optical signal reflected by the target and focusing the optical signal to the image sensor; the image sensor is arranged on the light-emitting side of the second superlens and used for generating the optical signal into the electric signal.

Optionally, the camera further comprises: a narrow band filter; the narrow-band filter is arranged between the image sensor and the second super lens and used for filtering light out of the working wavelength.

Optionally, in a case that the light source of the structured light generator comprises a vertical cavity laser array and the first superlens comprises a plurality of superlenses, the imaging apparatus further comprises: a displacement module array transparent at the operating band; the displacement module array comprises a plurality of displacement modules; the displacement module is used for changing the distance between the superlens and the corresponding vertical cavity laser in the structured light generator; the first super lens can project the laser beams into speckles under the condition that the distance between each super lens and the corresponding vertical cavity laser is consistent; the first superlens is capable of forming a flood illumination from the laser beam in the event that at least half of the distance between the superlens and the corresponding vertical cavity laser is non-uniform.

Optionally, the displacement module array is attached to the light source, and each displacement module corresponds to each vertical cavity laser; each displacement module is used for changing the position of the corresponding vertical cavity laser in the light emitting direction.

Optionally, the displacement module array is attached to the first superlens, and each displacement module corresponds to each superlens; each displacement module is used for changing the position of the corresponding super lens in the light emitting direction of the light source.

Optionally, the imaging device further comprises: an illumination module; the lighting module includes: an illumination light source and a third superlens; the illumination light source and the third super lens are both arranged on the backlight side of the display panel, and the third super lens is arranged on the light-emitting side of the illumination light source; the third super lens can form the light emitted by the illumination light source into flood illumination.

Optionally, the light source of the structured light generator and the illumination light source are independently controlled light sources and are illuminated alternately.

Optionally, the first superlens of the structured light generator is integral with the third superlens of the illumination module.

The third aspect, the embodiment of the utility model provides a full screen electronic equipment is still provided, include: the imaging apparatus as described in any one of the above; the display panel included in the structured light generator in the imaging apparatus is a full-screen display panel of the full-screen electronic device.

The embodiment of the utility model provides an in the above-mentioned scheme that the first aspect provided, adopt first super lens to laser beam modulation, can reduce this structured light greatly and produce holistic thickness, reduce shared installation space, satisfy frivolous demand simultaneously under the condition that realizes higher screen account for ratio, and reduce cost.

The embodiment of the utility model provides an in the scheme that above-mentioned second aspect provided, owing to used more frivolous structured light generater for this image device itself can make more frivolous and miniaturization, and then can reduce installation space, makes the whole weight decline of degree of depth camera, can be applicable to the light sensing terminal that requires very harsher to the space, like cell-phone, AR/VR equipment etc..

In the embodiment of the present invention, in the scheme provided by the third aspect, the imaging device is adopted as the imaging device in the electronic device, and the display panel is transparent in the working band, so that the display panel can be directly used as the external screen of the electronic device, and the electronic device can really realize full-screen; still because this image device itself is more slim compact, and need not additionally set up other outer screens again to this comprehensive screen electronic equipment's thickness has been reduced greatly.

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 following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 shows a schematic structural diagram of a structured light generator provided by an embodiment of the present invention;

fig. 2 shows a schematic diagram of speckles in a structured light generator provided by an embodiment of the present invention;

fig. 3 shows a schematic structural diagram of another structured light generator provided by an embodiment of the present invention;

fig. 4 shows a schematic diagram of speckles in another structured light generator provided by an embodiment of the present invention;

fig. 5 shows a schematic diagram of a structured light generator comprising a first superlens having a plurality of superlenses in an embodiment of the present invention;

FIG. 6 is a diagram showing an object-image relationship of a superlens according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a structured light generator comprising a first superlens having NN superlenses in an embodiment of the invention;

fig. 8 shows a schematic diagram of the position of a superstructure unit in a structured light generator provided by an embodiment of the present invention;

fig. 9 shows a top view of a superstructure unit in a structured light generator provided by an embodiment of the invention;

fig. 10 illustrates a perspective view of a superstructure unit comprising one first nanostructure in a structured light generator provided by an embodiment of the invention;

fig. 11 shows a schematic structural diagram of a structured light generator with a beam deflecting element provided by an embodiment of the present invention;

fig. 12 shows a schematic structural diagram of a first superlens in a structured light generator provided by an embodiment of the present invention;

fig. 13 is a schematic structural diagram of an image forming apparatus according to an embodiment of the present invention;

fig. 14 is a schematic diagram illustrating a specific structure of a camera in an imaging apparatus according to an embodiment of the present invention;

fig. 15 is a schematic diagram showing a specific structure of another camera in the imaging device according to the embodiment of the present invention;

fig. 16 is a schematic structural diagram illustrating a displacement module array attached to a light source in an imaging device according to an embodiment of the present invention;

fig. 17 is a schematic view of a floodlight in the image forming apparatus according to the embodiment of the present invention;

fig. 18 is a schematic structural diagram illustrating a displacement module array attached to a first superlens in an imaging device according to an embodiment of the present invention;

fig. 19 is a schematic structural diagram of an imaging device provided in an embodiment of the present invention, including an illumination module;

fig. 20 is a schematic view illustrating an integral structure of a first superlens and a third superlens in an imaging device according to an embodiment of the present invention;

fig. 21 is a top cross-sectional view of a full-screen electronic device according to an embodiment of the present invention.

An icon:

1-structured light generator, 2-camera, 3-displacement module array, 4-illumination module, 11-light source, 12-first superlens, 13-display panel, 14-beam deflection element, 21-image sensor, 22-second superlens, 23-narrow band filter, 31-displacement module, 41-illumination light source, 42-third superlens, 100-imaging device, 112-vertical cavity laser, 120-superlens, 131-superstructure unit, 1311-first nanostructure, 121-substrate, 122-second nanostructure, 123-phase change material layer, 124-first electrode layer, 125-second electrode layer.

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 of ordinary skill in the art.

An embodiment of the present invention provides a structured light generator, as shown in fig. 1, the structured light generator includes: a light source 11, a first superlens 12, and a display panel 13; the light source 11 is used for emitting laser infrared beams; the first superlens 12 is arranged on the light-emitting side of the light source 11 and used for projecting the laser infrared beam into speckles; the light source 11 and the first superlens 12 are disposed on the backlight side of the display panel 13, and the display panel 13 is transparent in the wavelength range of the laser beam. In fig. 1, the upper side of the light source 11 is shown as the light exit side thereof, and the lower side of the display panel 13 is shown as the backlight side thereof.

In the structured light generator provided in the embodiment of the present invention, as shown in fig. 1, the light source 11, the first superlens 12, and the display panel 13 are sequentially disposed from bottom to top. The display panel 13 may be an external screen of a screen (such as a display screen, a mobile phone screen, etc.). Alternatively, the display panel is an organic light emitting diode screen, that is, in the case where the screen is an Organic Light Emitting Diode (OLED) screen having a self light emitting display characteristic without a backlight and without a liquid crystal, the organic light emitting diode screen may be used as the display panel 13. Wherein, the side of the display panel 13 which can not display image (such as the lower side of the display panel 13 in fig. 1) is the backlight side thereof; that is, the light source 11 and the first superlens 12 in the embodiment of the present invention are located on the backlight side of the display panel 13. In the embodiment of the present invention, the material of the display panel 13 may include glass, organic glass (PMMA) or other transparent materials, such as Polyamide (PA, polyamide). It should be noted that the transparency in the embodiment of the present application refers to transparency to the light beam in the operating wavelength band, for example, transparency in the wavelength range of the laser beam emitted by the light source 11, i.e. high transmittance to the laser beam, so that the display panel 13 can transmit the light (speckle) to be projected by the structured light generator.

In the embodiment of the present invention, the laser beam emitted from the light source 11 to the first superlens 12 can be modulated by the first superlens 12, for example, the laser beam can be projected as speckle after being modulated by the first superlens 12, wherein the speckle is a pattern of structured light, and as shown in fig. 2, the speckle can be a point cloud pattern; the speckle, after passing through the display panel 13, can be used to implement a detection function. For example, the laser beam is modulated into speckles by the first superlens 12 to be emitted to the display panel 13, and the speckle generated by the first superlens 12 can be transmitted through the display panel 13 to be detected because the display panel 13 is transparent in the wavelength range of the laser beam (modulated into speckles).

The embodiment of the utility model provides a structured light generator adopts first super lens 12 to laser beam modulation, can reduce the holistic thickness of this structured light generator greatly, reduces shared installation space, satisfies frivolous demand simultaneously under the condition that realizes higher screen account for ratio, can also reduce cost.

Optionally, the light source 11 comprises: a single vertical cavity laser; the first superlens 12 is also used to collimate and replicate the beam splitting of the laser beam.

In the embodiment of the present invention, the light source 11 may be a single vertical cavity laser, and the laser beam emitted by the vertical cavity laser is a single laser beam; the first superlens 12 corresponding to the light source 11 may not only project the laser beam emitted by the light source 11 as speckles, but also collimate and replicate the laser beam; that is, the first superlens 12 is a compound superlens capable of modulating three kinds of laser beams (single laser beams) emitted from the light source 11. The first modulation process is to modulate the laser beam into structured light (speckle); the second modulation process is to expand the number of the laser beams (single laser beams), i.e. copy beam splitting, so that the number of the single laser beams can be split into multiple beams; the third modulation process is to perform collimation modulation on the laser beam, wherein the collimation is used to align the beam (such as laser beam) in a specific direction to form a collimated light line or a parallel light line, so that the beam (such as laser beam) does not spread with distance or at least the spreading degree is minimized.

The embodiment of the utility model provides an in, first super lens 12 can make final directive display panel 13's speckle not receive light source 11's restriction, even if this light source 11 is single vertical cavity laser, this first super lens 12 also can be with single beam laser modulation for the structured light of multibeam collimation, makes directive display panel 13's speckle quantity increase, if throw to the point cloud, makes the detection scope who sees through display panel 13 wider. The embodiment of the utility model provides an adopt single vertical cavity laser also can realize the projection of speckle on a large scale, the cost is lower.

Alternatively, referring to fig. 3, the light source 11 includes: the first super lens 12 comprises a plurality of super lenses 120, and the super lenses 120 can amplify and reproduce laser beams.

In the embodiment of the present invention, the light source 11 includes a plurality of vertical cavity lasers 112, and the plurality of vertical cavity lasers 112 are randomly arranged, for example, the randomly arranged vertical cavity lasers 112 may be light emitting points of the vertical cavity laser array, and the laser beam emitted by the light source 11 is a plurality of randomly arranged laser beams. The first superlens 12 corresponding to the light source 11 may include a plurality of superlenses 120, as shown in fig. 3, the first superlens 12 is an array of the superlenses 120; the superlens 120 can modulate the laser beam (multiple laser beams) emitted by the vertical cavity laser array, and the modulation process can project the laser beam as speckles and can amplify and copy the entire laser beam. The replication process refers to expanding the number of laser beams (multiple laser beams) emitted by the vertical cavity laser array, for example, replicating beam splitting so that the number of laser beams can be split into more laser beams; the enlarging process means that the size of the speckle pattern generated by the laser beam after being modulated by the super lens 120 can be enlarged to enlarge the detection area of the speckle finally emitted by the display panel 13, and fig. 4 shows the schematic diagram of the speckle generated by the structured light generator after being enlarged and copied.

Alternatively, referring to fig. 5, the first superlens 12 is disposed coaxially with the light source 11; the superlens 120 has a positive focal length for the laser beam, and the exit facet of the vertical cavity laser 112 is located at an object focal plane of the superlens 120.

As shown in fig. 5, the randomly distributed laser beam emitted from the light source 11 is transmitted through the first superlens 12 to generate a random magnified reproduction lattice (e.g., magnified reproduced speckle) in the far field. As shown in fig. 5, each superlens 120 in the first superlens 12 is a transmissive superlens, and the first superlens 12 and the light source 11 are disposed on the same optical axis.

Fig. 6 shows an alternative object-image relationship diagram for each superlens 120 in the structured light generator provided by the embodiments of the present invention. Referring to fig. 6, in the structured light generator, each vertical cavity laser 112 (e.g. the light source 11) is respectively associated with a corresponding superlens 120 (e.g. the first superlens 12) having the same focal length, at least the relationship in formula (1) is satisfied.

Where u is the object distance of each superlens 120 (first superlens 12), v is the image distance of each superlens 120 (first superlens 12), and f is the focal length of each superlens 120 (first superlens 12). In general, the random magnified replica lattice (e.g., the magnified replicated speckle) formed by the structured light generator is at a distance (i.e., image distance) of greater than 10 cm from each superlens 120 (first superlens 12), and therefore, in conjunction with equation (1), u ≈ f, i.e., each vertical cavity laser 112 (light source 11) is located at the object-side focal plane of each superlens 120 (first superlens 12).

In the embodiment of the present invention, when the first super lens 12 and the vertical cavity laser array (light source 11) arranged randomly are adopted, the projected speckles can be made to be the speckles processed by amplification and duplication.

Alternatively, as shown in FIG. 7, the superlenses 120 are arranged in an array of A B patterns; the values of A and B are both more than or equal to 3.

As shown in fig. 7, in the structured light generator provided by the embodiment of the present invention, a plurality of superlenses 120 are arranged in an array to form the first superlens 12, and each superlens 120 is arranged in an array of a × B patterns; wherein, a and B represent the number of rows and columns of the superlens 120, that is, a and B are both natural numbers greater than zero, and the values of a and B are both greater than or equal to 3. Wherein, the values of A and B can be equal, or the values of A and B can be unequal.

Specifically, as shown in fig. 7, according to the phase of each superlens 120, when the laser beam emitted from the vertical cavity laser 112 passes through the corresponding superlens 120, the laser beam is diffracted to the predetermined diffraction direction vector, so as to form an amplified replica lattice (e.g. speckle after amplification replication) at different positions of the region to be detected (e.g. the light-colored plane located above in fig. 7, i.e. the light-emitting side of the first superlens 12 in the embodiment of the present invention). For example, the superlens 120 may diffract the incident laser beam into m × n directions, m and n being natural numbers other than a and B. The values of m and n are related to design requirements and are not limited by A and B. For example, any superlens 120 may diffract the incident laser beam to split m × n diffracted spots, where m and n are illustratively equal to 11, and the array of superlenses 120 (first superlens 12) may be 1000 × 500 to form a plurality of spot-like spots (speckles) in the far field. Optionally, the magnifying replicator is a diffractive beam splitter.

Alternatively, referring to fig. 8, a plurality of superstructure units 131 are provided on a surface of one side of the display panel 13 away from the backlight side; in fig. 8, the lower side of the display panel 13 is shown as the backlight side, i.e., a plurality of superstructure units 131 are disposed on the upper surface of the display panel 13.

As shown in fig. 9, the plurality of superstructure units 131 is constructed in a close-packable pattern; the center position and/or the vertex position of the close-packed pattern are/is provided with a first nano structure 1311; the first nanostructures 1311 are divided into four quadrants along the first axis and the second axis (in fig. 9, the first axis and the second axis are on one of the first nanostructures 1311 at the center position of the close-packed pattern, shown as a crossed solid line), and the projection of the cross-sectional pattern of the first nanostructures 1311 in any quadrant is the same on the first axis and the projection on the second axis; the cross-sectional patterns in any quadrant form a cross-sectional pattern of the first nanostructures 1311 symmetrically along the first and second axes, respectively; the first axis and the second axis are perpendicular to each other, and the first axis and the second axis are perpendicular to a height direction of the first nanostructure 1311, respectively.

Wherein the plurality of superstructure units 131 are stacked in the form of regular polygons, such as regular hexagons as shown in fig. 9; the center position and/or the vertex position of the regular polygon are respectively provided with a first nanostructure 1311, and the material of the first nanostructure 1311 may include one of silicon oxide, silicon nitride, aluminum oxide, gallium nitride, and titanium oxide; the first nanostructure 1311 may be a cylinder, a cuboid, or the like. In the embodiment of the present invention, as shown in fig. 10, the first nanostructure 1311 can be divided into four quadrants (four parts) along two axes perpendicular to each other and parallel to the display panel 13, that is, the first axis and the second axis, wherein the first axis and the second axis can be perpendicular to the height direction of the first nanostructure 1311, for example, in the xyz space, the first axis is an axis parallel to the x axis, the second axis is an axis parallel to the y axis, and the first axis and the second axis are perpendicular to the z axis.

Wherein, the length of the projection of the first nanostructure 1311 onto the first axis and the second axis respectively in any one quadrant of the cross section (the cross section parallel to the display panel 13) is the same, for example, the length of the projection of the first nanostructure 1311 onto the first axis and the second axis respectively in a first quadrant (e.g., the upper right quadrant in fig. 10) of the cross section of the first nanostructure 1311 is the same, that is, the cross section corresponding to the first quadrant is a sector-shaped cross section; furthermore, the embodiment of the present invention provides a cross-section that any one quadrant corresponds, all can be along primary shaft or secondary shaft, respectively with the mutual symmetry of cross-section of adjacent quadrant, make this first nanostructure 1311 divide into four bibliographic categories by primary shaft and secondary shaft etc. for the first nanostructure 1311 of this structure, and have the first nanostructure 1311 of this structure, it has the insensitive characteristics to the polarization state of incident beam (for example the laser beam who constitutes the speckle), thereby can be better to the permeability of the beam (for example the laser beam who constitutes the speckle) that different incident angles penetrated, even if this incident angle is the critical angle of total reflection, even be greater than the angle of this critical angle, this first nanostructure 1311 all can make most photons (for example the incident angle equals or is greater than the speckle of the critical angle of total reflection) escape to the air, improve and get light efficiency.

The embodiment of the utility model provides a set up a plurality of superstructure units 131 that are piled up and form by the first nanostructure 1311 of above-mentioned structure through keeping away from a side surface of the side of being shaded at display panel 13, can improve and get light efficiency, avoid taking place the unable problem that escapes of most photon that the total reflection caused with the speckle that different incident angles penetrated.

Optionally, referring to fig. 11, the structured light generator further comprises: a beam deflecting element 14; a beam deflecting element 14 disposed between the light source 11 and the first superlens 12 for changing the optical path of the laser beam; in fig. 11, the left side of the light source 11 is shown as the light exit side, and the lower side of the first superlens 12 is shown as the light entrance side.

In the structured light generator provided in the embodiment of the present invention, a beam deflection element 14 may be further disposed between the light source 11 and the first superlens 12 to change the optical path direction of the laser beam emitted by the light source 11; the beam deflection element 14 may include a mirror, a prism, or a super surface for reflection (e.g., a super surface coated with a reflective film on a side surface close to the light source 11). As shown in fig. 11, the beam deflecting element 14 is a mirror, which can be disposed at the intersection point of the main optical axes (shown by the dashed line in fig. 11) of the light source 11 and the first superlens 12, and the main optical axes of the first superlens 12 and the light source 11 can be symmetrical along the normal of the mirror (beam deflecting element 14); the mirror (beam deflecting element 14) deflects the optical path of the laser beam emitted from the light source 11, which is not provided coaxially with the first superlens 12, by reflecting the laser beam, so that the laser beam can be emitted toward the first superlens 12.

The embodiment of the utility model provides a can utilize light beam deflection component 14, change the light path of the laser beam who jets out light source 11 for light source 11 and first super lens 12 can not coaxial setting, for example, can satisfy the structure that first super lens 12 and light source 11 mutually perpendicular set up, and this kind of structure can be better be applicable to in the practical application, for example, can make this structured light generater more slim, save and set up the space.

Alternatively, referring to fig. 12, the first superlens 12 includes a substrate 121, a second nanostructure 122, a phase change material layer 123, a first electrode layer 124, and a second electrode layer 125.

A plurality of second nanostructures 122 are disposed on one side of the substrate 121, the first electrode layer 124 is filled around the second nanostructures 122, and the height of the first electrode layer 124 is lower than that of the second nanostructures 122; the phase change material layer 123 is disposed on a side of the first electrode layer 124 away from the substrate 121, and fills the periphery of the second nanostructure 122, and a sum of heights of the first electrode layer 124 and the phase change material layer 123 is greater than or equal to a height of the second nanostructure 122; the second electrode layer 125 is disposed on a side of the phase change material layer 123 away from the substrate 121; the first electrode layer 124 and the second electrode layer 125 are used for applying a voltage to the phase change material layer 123, and the phase change material layer 123 can change the focal length of the first superlens 12 according to the applied voltage.

Wherein, the substrate 121 of the first superlens 12 may be made of quartz glass, crown glass, flint glass, etc., one side of the substrate 121 of the first superlens 12 (fig. 12 shows an upper side of the substrate 121) is provided with a plurality of second nanostructures 122, the second nanostructures 122 may be highly uniform second nanostructures, and the second nanostructures 122 may be all-dielectric structural units, and have high transmittance in a working waveband (such as a waveband corresponding to a laser beam), and the selectable materials include: titanium oxide, silicon nitride, fused silica, aluminum oxide, gallium nitride, gallium phosphide, amorphous silicon, crystalline silicon, hydrogenated amorphous silicon, and the like. The first electrode layer 124 is filled around the plurality of second nanostructures 122 (e.g. the gap between two second nanostructures) of the first superlens 12, and the height of the first electrode layer 124 is lower than the height of each second nanostructure 122, for example, the height of the first electrode layer 124 may be half of the height of the second nanostructure 122. On the side of the first electrode layer 124 away from the substrate 121 (the upper side of the first electrode layer 124 shown in fig. 12), a phase change material layer 123 is filled, the phase change material layer 123 is also filled around the plurality of second nanostructures 122 like the first electrode layer 124, and the sum of the heights obtained by adding the height of the phase change material layer 123 to the height of the first electrode layer 124 may be greater than the height of the second nanostructures 122, or the sum of the heights may also be equal to the height of the second nanostructures 122; as shown in fig. 12, the upper surface of the phase change material layer 123 is not lower than the upper surface of the second nanostructure 122, so as to prevent the second nanostructure 122 from contacting the second electrode layer 125. A second electrode layer 125 is disposed on a side of the phase change material layer 123 away from the substrate 121 (as shown in fig. 12, the second electrode layer 125 and the first electrode layer 124 are respectively disposed on two sides of the phase change material layer 123 for applying a voltage to the phase change material layer 123, wherein after the phase change material layer 123 receives the voltages applied by the first electrode layer 124 and the second electrode layer 125, a phase change state of the phase change material layer 123 changes, so that a focal length of the first superlens 12 can be changed.

Specifically, the phase change material layer 123 may change a phase change state according to a difference in magnitude of a voltage applied to the first electrode layer 124 and the second electrode layer 125 as a whole, thereby changing a refractive index of the whole; in contrast, for the phase change material layer 123, the applied voltage and the refractive index thereof are in a corresponding relationship with each other. For example, for the phase change material layer 123 made of some materials, as long as the applied voltage increases, the refractive index thereof increases; for the phase change material layer 123 made of some other materials, as long as the applied voltage increases, the refractive index thereof decreases; alternatively, it is also possible that the phase change material layer 123 made of a material has a refractive index proportional to the voltage in a certain voltage range and a refractive index inversely proportional to the voltage in another certain voltage range. Since the phase change material layer 123 is filled around the plurality of second nanostructures 122 of the first superlens 12, when the refractive index of the phase change material layer 123 is changed, the focal length of the first superlens 12 including the phase change material layer 123 can be changed, and the field angle of the speckle projected through the first superlens 12 can also be changed. In the embodiment of the present invention, when the refractive index of the phase change material layer 123 is decreased, the focal length of the first superlens 12 including the phase change material layer 123 is increased, and the field angle of the speckles projected by the first superlens 12 is decreased; when the refractive index of the phase change material layer 123 is increased, the focal length of the first superlens 12 including the phase change material layer 123 is decreased, and the field angle of the speckle projected by the first superlens 12 can be increased.

In the structured light generator provided by the embodiment of the present invention, the first superlens 12 has selected the phase change material layer 123 as a filling material to be filled around the second nanostructure 122, and the focal length of the first superlens 12 is changed by utilizing the characteristic that the phase change material layer 123 can change the phase change state correspondingly after being influenced by the voltage; the structured light generator can stably and accurately switch the size of the field angle of the projected speckles, so that the structured light generator can realize the function of adjusting the field angle, further, targets needing to be detected can be projected with the same number of speckles at different positions, and the targets can be ensured to have the same measurement precision at different positions.

The embodiment of the utility model provides a still provide an image device, see fig. 13 and show, this image device includes: structured light generator 1 and camera 2 as any of the above; the camera 2 is arranged at the backlight side of the display panel 13 of the structured light generator 1; fig. 13 shows the display panel 13 on its backlight side below. Wherein the structured light generator 1 is configured to project speckles towards an object, the object being located at a side of the display panel 13 away from the backlight side; the camera 2 is used for receiving the optical signal reflected by the target and generating an electrical signal from the optical signal.

In the imaging device provided in the embodiment of the present invention, the camera 2 is disposed on the backlight side of the display panel 13 of the structured light generator 1, for example, the camera 2 may be located on the same plane as the light source 11 of the structured light generator 1; the target to be detected (e.g. a human face or a certain area) is located on the side of the display panel 13 where the image cannot be displayed, i.e. the side of the display panel 13 away from the backlight side (e.g. the upper side of the display panel 13 in fig. 13). When an object needs to be detected, the structured light generator 1 projects speckles on the object, for example, the generated speckles are transmitted through the display panel 13 of the structured light generator 1 and are emitted to the surface of the object; under the condition that the speckles are uniformly distributed on the target surface, the camera 2 can receive the optical signal reflected by the target surface and convert the optical signal into an electric signal, so that the subsequent processing is facilitated, for example, the depth of the target can be calculated according to the relative positions of the speckles; wherein, this camera 2 is prior art with the process of this light signal generation signal of telecommunication, the embodiment of the utility model discloses do not carry out any improvement to this process.

The embodiment of the utility model provides an imaging device is owing to used more frivolous structured light generator 1 for this imaging device itself can make more frivolous and miniaturization, and then can reduce installation space, makes the whole weight decline of degree of depth camera, can be applicable to the light sensing terminal that requires very harsher to the space, like cell-phone, AR/VR equipment etc..

Alternatively, as shown in fig. 14, the camera 2 includes: an image sensor 21 and a second superlens 22; the second super lens 22 is arranged on the backlight side of the display panel 13, and the second super lens 22 is used for receiving the optical signal reflected by the target and focusing the optical signal to the image sensor 21; the image sensor 21 is disposed on the light-emitting side of the second superlens 22, and generates an electrical signal from the optical signal.

In fig. 14, the lower side of the second superlens 22 is shown as the light exit side. In the embodiment of the present invention, when the optical signal reflected by the speckle projected onto the target surface transmits through the display panel 13 to the camera 2, the optical signal can be transmitted into the second superlens 22 in the camera 2 first, and the optical signal is converged by the second superlens 22, for example, the second superlens 22 focuses the reflected optical signal onto the surface of the image sensor 21 located on the light-emitting side thereof. The image sensor 21 may be a CCD (charge Coupled Device), or it may also be a CMOS (Complementary Metal Oxide Semiconductor); the image sensor 21 can convert the optical signal focused on its surface by the second superlens 22 into an electrical signal, and use the electrical signal for subsequent information processing, wherein the process of generating the electrical signal from the optical signal by the image sensor 21 is prior art, and the embodiment of the present invention does not improve this process at all.

Optionally, referring to fig. 15, the camera 2 may further include: a narrow-band filter 23; the narrow band filter 23 is disposed between the image sensor 21 and the second superlens 22, and the narrow band filter 23 is used for filtering light out of the operating wavelength.

In the embodiment of the present invention, in order to make the optical signal converged on the surface of the image sensor 21 not include the optical signal with other wavelengths except the optical signal corresponding to the working wavelength, such as the optical signal with other wavelengths except the wavelength of the laser beam (e.g. stray light), a narrow band filter 23 may be disposed on the light exit side of the second superlens 22, so that the narrow band filter restricts the wavelength of the optical signal focused by the second superlens 22 within a smaller range, and the smaller range can correspond to the range of the working wavelength of the imaging device, for example, the smaller range is consistent with the range of the wavelength of the laser beam; in other words, the narrow band filter may filter out an optical signal having a non-operating wavelength among wavelengths of an optical signal focused by the second superlens 22, retain only the optical signal having the operating wavelength, and converge the optical signal having the operating wavelength to the image sensor 21 at the light-emitting side thereof. The narrow-band filter refers to a filter with a passband smaller than a preset threshold.

The embodiment of the utility model provides an adopt narrowband filter 23 can filter the light signal of miscellaneous light for the light signal of focusing on image sensor 21 surface is the light signal of the operating wavelength of required detection, can improve the holistic detection precision of this image device.

Alternatively, referring to fig. 16, in the case that the light source 11 of the structured light generator 1 comprises a vertical cavity laser array, and the first superlens 12 comprises a plurality of superlenses 120, the imaging apparatus further comprises: a displacement module array 3 transparent in the working waveband; the displacement module array 3 includes a plurality of displacement modules 31; wherein, the displacement module 31 is used to change the distance between the superlens 120 and the corresponding vertical cavity laser 112 in the structured light generator 1; with the distance between each superlens 120 and the corresponding vertical cavity laser 112 being uniform, the first superlens 12 is capable of projecting the laser beam as speckle; in the event that at least half of the superlenses 120 are not equidistant from the corresponding vertical cavity lasers 112, the first superlens 12 is capable of flood illuminating the laser beams.

As shown in fig. 16, in the embodiment of the present invention, the light source 11 in the structured light generator 1 in the imaging device is a vertical cavity laser array, that is, the light source 11 includes a plurality of vertical cavity lasers 112 arranged in an array, and the light emitting direction of each vertical cavity laser 112 is uniform; accordingly, the first superlens 12 in the structured light generator 1 comprises a plurality of superlenses 120, each superlens 120 has the same focal length, and each superlens 120 can correspond to each vertical cavity laser 112, so that each vertical cavity laser 112 can emit a laser beam to each superlens 120, respectively. The imaging device may further include a plurality of displacement modules 31 arranged in an array, that is, a displacement module array 3; each displacement module 31 may be a piezoelectric ceramic, a magnetostrictive displacement device, an electrostrictive displacement device, or the like; each displacement module 31 can correspond to a group of vertical cavity lasers 112 and superlenses 120 corresponding to each other, for example, the displacement modules 31, the vertical cavity lasers 112, and the superlenses 120 are in a one-to-one correspondence relationship, and one displacement module 31 can adjust a distance between one vertical cavity laser 112 and the corresponding superlens 120 in a light emitting direction (the light emitting direction of the vertical cavity laser 112). For example, the light source 11 (e.g., each vertical cavity laser 112) is fixed, and the corresponding superlens 120 is moved according to the displacement module 31; alternatively, the distance between the light source 11 (e.g., each vertical cavity laser 112) and the corresponding superlens 120 may be changed according to the movement of the displacement module 31 while maintaining the superlens 120 in a stationary state.

In fig. 16, the upper side of the light source 11 is taken as the light emitting side, and fig. 16 shows the case that the shift module array 3 is attached to the light source 11, each shift module 31 in the shift module array 3 changes the distance between the vertical cavity laser 112 and the corresponding superlens 120 in the light emitting direction by moving the vertical cavity laser 112 attached thereto.

In the embodiment of the present invention, each displacement module 31 can adjust the distance between each superlens 120 and the corresponding vertical cavity laser 112 to be the same, for example, all superlenses 120 are located on the same plane a, all displacement modules 31 adjust all vertical cavity lasers 112 to another same plane B, which is parallel to the plane a and the plane B, and the distance between the vertical cavity laser 112 and the superlens 120 in the light emitting direction is the same at this time. Since the focal length of each superlens 120 is the same, each superlens 120 in the first superlens 12 can project the laser beam emitted by the corresponding vertical cavity laser 112 in the light source 11 as speckle, i.e. generate structured light, and can perform a function of replicating and amplifying the laser beam emitted by the vertical cavity laser 112, wherein a schematic diagram of the projection effect of the structured light can be shown in fig. 4; when the distances between at least half of the superlenses 120 and the corresponding vertical cavity lasers 112 are adjusted to be different by at least part of the displacement modules 31, for example, the distances between more than half (e.g., 60%, 80%, or even 100%) of the superlenses 120 and the corresponding vertical cavity lasers 112 are adjusted to be different by the displacement modules 31, so that the light spots emitted by each superlens 120 are different in size and form a superposition, so that the first superlens 12 can form the laser beams emitted by the light source 11 into flood lighting, wherein a schematic projection effect of the flood lighting can be seen in fig. 17.

The embodiment of the utility model provides a change every super lens 120 and the distance between the vertical cavity laser 112 corresponding through the displacement module array 3 that has a plurality of displacement modules 31 of adoption to make this imaging device can realize the switching of two kinds of functions, for example, can realize throwing speckle and floodlight illumination in same imaging device, under the condition that certain equipment need have these two kinds of functions, use the imaging device that this embodiment provided to reduce shared installation space.

Optionally, referring to fig. 16, the shift module array 3 is attached to the light source 11, and each shift module 31 corresponds to each vertical cavity laser 112; each displacement module 31 is used for changing the position of the corresponding vertical cavity laser 112 in the light emitting direction.

The displacement module array 3 may be disposed on the non-light-emitting side of the light source 11 as shown in fig. 16, that is, each displacement module 31 may correspond to each vertical cavity laser 112, and is attached to the non-light-emitting side of each vertical cavity laser 112, and when a function needs to be switched (for example, when the imaging device is switched from projection speckle to flood lighting), the specific position of the corresponding vertical cavity laser 112 in the light-emitting direction thereof may be changed by each displacement module 31, so as to change the distances between different vertical cavity lasers 112 and the corresponding superlens 120 in the light-emitting direction thereof, so that the distances are changed from completely consistent to mutually inconsistent, and the imaging device is switched to the flood lighting function. In the embodiment of the present invention, except setting this displacement module array 3 in the position as shown in fig. 16, it can also set it in the light-emitting side of the light source 11, and each displacement module 31 can also change the position where the vertical cavity laser 112 of the corresponding laminating with it is located, wherein, each displacement module 31 in this displacement module array 3 is transparent in the working waveband, i.e. has high transmittance to the light of the working waveband (e.g. the laser beam emitted by the vertical cavity laser 112).

For example, in the case of projecting speckle by the imaging device, the distance between each vertical cavity laser 112 and the superlens 120 is the same, that is, the position of each vertical cavity laser 112 is the same, during the process of switching functions, the at least partial displacement module 31 may be used to move the position of at least a part of the vertical cavity lasers 112 correspondingly attached to each vertical cavity laser along the light emitting side (or non-light emitting side) direction of the vertical cavity lasers, so that the vertical cavity lasers 112 are closer to (or farther from) the superlens 120 corresponding to the vertical cavity lasers, and the distance between the vertical cavity lasers 112 and the superlens 120 corresponding to the vertical cavity lasers is reduced (or increased). The distance that each displacement module 31 drives the corresponding vertical cavity laser 112 to move is not limited, and the imaging device can be switched from projection speckle to flood illumination as long as the distances between the vertical cavity lasers 112 and the corresponding superlenses 120 are inconsistent, for example, when the difference between the distances between different vertical cavity lasers 112 and the corresponding superlenses 120 is a random value.

The embodiment of the utility model provides an imaging device will have displacement module array 3 of a plurality of displacement modules 31 and laminate mutually with the light source 11 that has a plurality of vertical cavity lasers 112, and every displacement module 31 can be corresponding with every vertical cavity laser 112 respectively to change its position, and then make every vertical cavity laser 112 and the distance between the corresponding super lens 120 change to some extent.

Alternatively, referring to fig. 18, the shift module array 3 is attached to the first superlens 12, and each shift module 31 corresponds to each superlens 120; each displacement module 31 is used for changing the position of the corresponding superlens 120 in the light emitting direction of the light source 11.

The displacement module array 3 may be disposed on the light-emitting side of the first superlens 12 as shown in fig. 18, that is, each displacement module 31 may correspond to each superlens 120, and is attached to the light-emitting side of each superlens 120, and when the function needs to be switched (for example, when the imaging device is switched from the projection speckle to the flood lighting), the specific position of the superlens 120 corresponding to the displacement module 31 may be changed by each displacement module 31, so as to change the distances between different superlenses 120 and the corresponding vertical cavity lasers 112, so that the distances are changed from being completely consistent to being inconsistent, and further, the imaging device is switched to the flood lighting function. In the embodiment of the present invention, except setting up this displacement module array 3 in the position as shown in fig. 18, it is also possible to set up it in the light-entering side of the first super lens 12, so as to change the position where the super lens 120 corresponding to the displacement module 31 is located, wherein, no matter this displacement module array 3 is attached to the light-entering side or the light-emitting side of this first super lens 12, each displacement module 31 in this displacement module array 3 is transparent in the working waveband, and has a high transmittance to the light beam of the working waveband (for example, the laser beam emitted by the vertical cavity laser 112). The switching of different functions is realized by changing the position of the corresponding superlens 120 through each displacement module 31 in the displacement module array 3, and the switching principle is the same as that of different functions realized by changing the position of the corresponding vertical cavity laser 112 through the displacement module 31, and is not described herein again.

The embodiment of the utility model provides an imaging device will have displacement module array 3 of a plurality of displacement modules 31 and laminate mutually with the first super lens 12 that has a plurality of super lens 120, make every displacement module 31 can correspond with every super lens 120 respectively to change its position, and then make every super lens 120 and the distance between the corresponding vertical cavity laser 112 change to some extent.

Optionally, referring to fig. 19, the imaging apparatus further includes: a lighting module 4; the lighting module 4 includes: an illumination light source 41 and a third superlens 42; the illumination light source 41 and the third superlens 42 are both disposed on the backlight side of the display panel 13, and the third superlens 42 is disposed on the light exit side of the illumination light source 41; the third superlens 42 can form flood illumination of light emitted from the illumination light source 41.

As shown in fig. 19, the imaging device provided in the embodiment of the present invention may further include an illumination module 4 in addition to the structured light generator 1 and the camera 2. Wherein the illumination module 4 is disposed at the backlight side of the display panel 13 of the structured light generator 1, for example, the illumination module 4 and the light source 11 of the structured light generator 1 can be disposed on the same plane; the lighting module 4 is capable of flood lighting a target, for example, the lighting module 4 can transmit a laser beam generated and used for flood lighting through the display panel 13 of the structured light generator 1 and towards the target.

Further, the lighting module 4 may include: an illumination light source 41 and a third superlens 42. The illumination source 41 may comprise a Light Emitting Diode (LED) for emitting a light beam forming a flood illumination; the third superlens 42 is disposed on the light-emitting side of the illumination light source 41, i.e. the side of the illumination module 4 close to the display panel 13, and is used for modulating the light beam emitted by the illumination light source 41, for example, modulating the light beam into a light beam capable of realizing flood lighting, and making the light beam capable of realizing flood lighting transmit through the display panel 13 to the target surface.

The imaging device provided by the embodiment of the utility model adopts the lighter and thinner structured light generator 1 and the lighting module 4, so that the imaging device can realize the speckle projection function and the flood lighting function; for example, in a process of primary face recognition, the illumination module 4 of the imaging device can emit uniform light and realize flood illumination to identify main features of a face (such as eyes, mouth, and the like), and the imaging device can further obtain more accurate depth information through speckles projected by the structured light generator 1; this image device is under the condition that can realize dual function, and its whole is more frivolous and miniaturized, and then can reduce installation space, makes image device's whole weight descend, can be applicable to the optical sensing terminal that requires very much harsher to the space, for example super frivolous high screen account for than cell-phone, AR/VR equipment etc..

Alternatively, the light source 11 and the illumination light source 41 of the structured light generator 1 are independently controlled light sources and are illuminated alternately.

In the embodiment of the present invention, the light source 11 and the illumination light source 41 are independently controlled light sources, for example, the light source 11 can be controlled independently to be turned on or turned off, and the illumination light source 41 can also be controlled independently to be turned on or turned off. The light source 11 and the illumination light source 41 may be alternately turned on, for example, the light source 11 may be turned on and turned off once, and the illumination light source 41 may be turned on and turned off once again, and this process may be referred to as one-time alternate lighting; alternatively, the light source 11 may be turned on and off once, the illumination light source 41 may be turned on and off once again, and then the alternating process may be repeated a plurality of times from the turning on of the light source 11, that is, the light source 11 and the illumination light source 41 may be turned on and off repeatedly a plurality of times. Because light source 11 and illumination source 41 need not lighten simultaneously under the normal conditions, this utility model embodiment is through two light sources of independent control, and light in turn, can guarantee that the condition of lightening simultaneously can not appear in two light sources, can be used for throwing the light of speckle through light source 11 transmission promptly, also can be used for the light of floodlighting through illumination source 41 transmission.

Alternatively, referring to fig. 20, the first superlens 12 of the structured light generator 1 and the third superlens 42 of the illumination module 4 are of a unitary structure.

In the embodiment of the present invention, the first super lens 12 and the third super lens 42 can be processed as an integral structure, for example, the first super lens 12 and the third super lens 42 can share the same substrate, i.e. the same super lens substrate (such as the substrate of the first super lens 12) can be manufactured, and specifically, the first super lens 12 and the third super lens 42 can be manufactured by using the photolithography process on the same substrate, so as to obtain the super lens of the integral structure, a part corresponding to the light source 11 is the first super lens 12 having the capability of projecting the incident laser beam into the speckle, and the other part is the third super lens 42 having the capability of projecting the incident light laser beam uniformly and forming the flood lighting. The embodiment of the utility model provides an adopt super lens of a body structure will throw speckle and floodlight illumination and combine together, simple structure, no longer need consider the alignment encapsulation between a plurality of lenses, the cost is lower, further saves installation space.

The embodiment of the utility model provides a still provide a comprehensive screen electronic equipment, as shown in fig. 21, this comprehensive screen electronic equipment includes: an image forming apparatus 100; the display panel 13 included in the structured light generator 1 in the imaging apparatus 100 is a full-screen display panel of a full-screen electronic device.

In the embodiment of the present invention, the display panel 13 of the imaging device 100 (i.e. the display panel 13 included in the structured light generator 1 of the imaging device 100) can be directly used as a display panel of a full-screen electronic device; for example, the display panel 13 may be directly processed to fit the size of a screen of a full-screen electronic device (e.g., a mobile phone), so that the display panel 13 may directly serve as a display panel of the full-screen electronic device (e.g., an outer screen of the electronic device, specifically, an OLED screen), and thus, a bang area specially used for projecting speckles and floodlights may not be additionally disposed on the top of the full-screen electronic device (e.g., the top of the display panel 13), so as to really realize the full-screen.

The embodiment of the present invention adopts the imaging device 100 as the imaging device in the electronic device, and since it has the display panel 13 transparent in the working band, the display panel 13 can be directly used as the external screen of the electronic device, so that the electronic device can truly realize the full-screen; the thickness of the full-screen electronic device is greatly reduced because the imaging device 100 is thinner and more compact and does not need to be additionally provided with other external screens.

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

1. A structured light generator, comprising: a light source (11), a first superlens (12), and a display panel (13);

the light source (11) is used for emitting a laser beam;

the first super lens (12) is arranged on the light emitting side of the light source (11) and used for projecting the laser beam into speckles;

the light source (11) and the first superlens (12) are arranged on the backlight side of the display panel (13), and the display panel (13) is transparent in the wavelength range of the laser beam.

2. A structured light generator according to claim 1, wherein the display panel (13) is an organic light emitting diode screen.

3. A structured light generator according to claim 1, characterized in that the light source (11) comprises: a single vertical cavity laser; the first superlens (12) is also used for collimating and copying the laser beam.

4. A structured light generator according to claim 1, characterized in that the light source (11) comprises: the array of randomly arranged vertical cavity lasers, the first superlens (12) comprising a plurality of superlenses (120), the superlenses (120) being capable of magnifying and replicating the laser beams.

5. A structured light generator according to claim 4, wherein the first superlens (12) is arranged coaxially with the light source (11);

the superlens (120) has a positive focal length for the laser beam, and the exit face of the vertical cavity laser (112) is located at an object focal plane of the superlens (120).

6. The structured light generator according to claim 4, wherein the superlenses (120) are arranged in an array of A x B patterns; and the values of A and B are both more than or equal to 3.

7. A structured light generator as claimed in claim 1, characterized in that a plurality of superstructure units (131) is provided at a side surface of the display panel (13) remote from the backlight side;

a plurality of said superstructure units (131) being constructed in a close-packable pattern; the center position and/or the vertex position of the close-packable graph are/is provided with a first nanostructure (1311);

the first nanostructure (1311) is divided into four quadrants along a first axis and a second axis, and a projection of a cross-sectional pattern of the first nanostructure (1311) in any of the quadrants onto the first axis is the same as a projection onto the second axis; the cross-sectional pattern in any of the quadrants is symmetric along the first and second axes, respectively, to form a cross-sectional pattern of the first nanostructure (1311); the first axis and the second axis are perpendicular to each other, and the first axis and the second axis are perpendicular to a height direction of the first nanostructure (1311), respectively.

8. A structured light generator as claimed in claim 1, further comprising: a beam deflecting element (14); the beam deflection element (14) is arranged between the light source (11) and the first superlens (12) and is used for changing the optical path of the laser beam.

9. The structured light generator according to claim 1, wherein the first superlens (12) comprises a substrate (121), a second nanostructure (122), a phase change material layer (123), a first electrode layer (124) and a second electrode layer (125);

one side of the substrate (121) is provided with a plurality of second nanostructures (122), the first electrode layer (124) is filled around the second nanostructures (122), and the height of the first electrode layer (124) is lower than that of the second nanostructures (122); the phase change material layer (123) is arranged on one side, far away from the substrate (121), of the first electrode layer (124) and is filled around the second nano structure (122), and the sum of the heights of the first electrode layer (124) and the phase change material layer (123) is greater than or equal to the height of the second nano structure (122); the second electrode layer (125) is arranged on one side, away from the substrate (121), of the phase change material layer (123);

the first electrode layer (124) and the second electrode layer (125) are used for applying a voltage to the phase change material layer (123), and the phase change material layer (123) can change the focal length of the first superlens (12) according to the applied voltage.

10. An image forming apparatus, comprising: a structured light generator (1) and a camera (2) according to any of claims 1-9; the camera (2) is arranged at a backlight side of a display panel (13) of the structured light generator (1);

the structured light generator (1) is configured to project speckle towards an object, the object being located at a side of the display panel (13) remote from the backlight side;

the camera (2) is used for receiving the optical signal reflected by the target and generating an electric signal from the optical signal.

11. The imaging apparatus according to claim 10, characterized in that the camera (2) comprises: an image sensor (21) and a second superlens (22); the second super lens (22) is arranged on the backlight side of the display panel (13), and the second super lens (22) is used for receiving the optical signal reflected by the target and focusing the optical signal to the image sensor (21);

the image sensor (21) is arranged on the light-emitting side of the second superlens (22) and used for generating the optical signal into the electric signal.

12. The imaging apparatus according to claim 11, wherein the camera (2) further comprises: a narrow-band filter (23); the narrow-band filter (23) is arranged between the image sensor (21) and the second superlens (22), and the narrow-band filter (23) is used for filtering light out of the working wavelength.

13. The imaging device according to claim 10, wherein in case the light source (11) of the structured light generator (1) comprises a vertical cavity laser array and the first superlens (12) comprises a plurality of superlenses (120), the imaging device further comprises: a displacement module array (3) transparent in the operating band; the displacement module array (3) comprises a plurality of displacement modules (31);

the displacement module (31) is used for changing the distance between the superlens (120) and the corresponding vertical cavity laser (112) in the structured light generator (1);

the first superlens (12) being capable of projecting the laser beam into speckle with a uniform distance between each superlens (120) and the corresponding vertical cavity laser (112);

the first superlens (12) is capable of forming a flood illumination of the laser light beam in the event of a non-uniform distance between at least half of the superlens (120) and the corresponding vertical cavity laser (112).

14. The imaging apparatus according to claim 13, wherein the array of displacement modules (3) is attached to the light source (11), and each displacement module (31) corresponds to each vertical cavity laser (112);

each displacement module (31) is used for changing the position of the corresponding vertical cavity laser (112) in the light emitting direction.

15. The imaging apparatus according to claim 13, wherein the shift module array (3) is attached to the first superlens (12), and each shift module (31) corresponds to each superlens (120);

each displacement module (31) is used for changing the position of the corresponding super lens (120) in the light emitting direction of the light source (11).

16. The imaging apparatus of claim 10, further comprising: a lighting module (4); the lighting module (4) comprises: an illumination light source (41) and a third superlens (42); the illumination light source (41) and the third super lens (42) are both arranged on the backlight side of the display panel (13), and the third super lens (42) is arranged on the light-emitting side of the illumination light source (41);

the third super lens (42) can form flood illumination on the light emitted by the illumination light source (41).

17. The imaging apparatus according to claim 16, characterized in that the light source (11) of the structured light generator (1) and the illumination light source (41) are independently controlled light sources and are illuminated alternately.

18. The imaging device according to claim 16, characterized in that the first superlens (12) of the structured light generator (1) is of a unitary structure with the third superlens (42) of the illumination module (4).

19. A full-screen electronic device, comprising: the imaging apparatus (100) of any of the above claims 10-18; the display panel (13) comprised by the structured light generator (1) in the imaging apparatus (100) is a full-screen display panel of the full-screen electronic device.