CN117970364A - 3D image acquisition device - Google Patents

Abstract

The invention relates to a 3D image acquisition device, which comprises a detector, a light guide structure, a light selecting structure and an infrared emission structure, wherein the light selecting structure and the infrared emission structure are positioned between the light guide structure and an object to be acquired; the infrared emission structure is configured to emit infrared light to an object to be acquired; the light selecting structure is configured to receive infrared light and visible light reflected by an object to be collected and select incident light rays in different areas to enter the light guiding structure; the light guiding structure is configured to guide light rays exiting the light selecting structure to the detector to form a 3D target image.

Description

3D image acquisition device

Technical Field

The invention relates to the technical field of image acquisition, in particular to a 3D image acquisition device.

Background

In the related art, the 3D visual detection technology may be implemented by a plurality of light field cameras, and the light field cameras collect picture information at different positions to generate digital signals for 3D display. However, there are problems such as limited density of acquired parallax images and excessive number of cameras. The light field camera scheme based on the light selecting layer of the liquid crystal switch can realize continuous image point collection and reduce the number of cameras. However, this solution uses a light selecting layer based on a liquid crystal switch, and has the problems of low transmittance of liquid crystal, small light incoming amount, long exposure time, and incapability of real-time acquisition.

Disclosure of Invention

In order to solve the technical problems, the invention provides a 3D image acquisition device which solves the problems of small light inlet amount, long exposure time and incapability of real-time acquisition caused by low light transmittance of a light selecting structure.

In order to achieve the above purpose, the technical scheme adopted by the embodiment of the invention is as follows: the 3D image acquisition device comprises a detector, a light guide structure, a light selecting structure and an infrared emission structure, wherein the light selecting structure and the infrared emission structure are positioned between the light guide structure and an object to be acquired;

the infrared emission structure is configured to emit infrared light to an object to be acquired;

The light selecting structure is configured to receive infrared light and visible light reflected by an object to be collected and select incident light rays in different areas to enter the light guiding structure;

the light guiding structure is configured to guide light rays exiting the light selecting structure to the detector to form a 3D target image.

Optionally, the infrared emission structure includes a plurality of LED beads located at one side of the light selection structure.

Optionally, the light selecting structure includes a liquid crystal diaphragm, the liquid crystal diaphragm includes a plurality of light transmitting areas arranged at intervals along a first direction, and a plurality of the LED lamp beads are arranged along the first direction.

Optionally, the band of infrared light emitted by the infrared emission structure is 780-1000nm.

Optionally, the light guiding structure includes a mirror and a lens assembly that are located at a light emitting side of the light selecting structure, the mirror is configured to reflect light rays emitted from the light selecting structure to the lens assembly, and the lens assembly is configured to collect light rays reflected by the mirror, so that light rays reflected by the mirror enter the detector.

Optionally, the mirror is a MEMS mirror.

Optionally, the light guiding structure further includes a mirror driving unit, and the mirror driving unit is used for controlling the mirror to rotate, so that light rays exiting from different areas of the light selecting structure are incident to the lens assembly.

Optionally, the detector is located on a side of the focal plane of the lens assembly that is closer to or farther from the mirror.

Optionally, the distance between the detector and the focal plane of the lens assembly is 6% -8% of the focal length of the lens assembly.

Optionally, the device further comprises a display structure for displaying the 3D image formed by the detector.

Optionally, a plano-convex lens is arranged between the infrared emission structure and the object to be collected, the plane of the plano-convex lens faces towards the infrared emission structure, and the concave surface of the plano-convex lens faces towards the object to be collected.

Optionally, a distance between the plano-convex lens and the infrared emitting structure is less than or equal to a focal length of the plano-convex lens.

Optionally, the light guiding structure includes a first light guiding plate located at a light emitting side of the light selecting structure, the first light guiding plate includes a light incident surface facing the light selecting structure and a light emitting surface opposite to the light incident surface, a coupling-in structure is disposed on the light incident surface, and a coupling-out structure is disposed on the light emitting surface.

Optionally, the light guiding structure includes a second light guiding plate and a third light guiding plate located at a light emitting side of the light selecting structure, the second light guiding plate and the third light guiding plate are located on the same plane, and an included angle is formed between an extending direction of the second light guiding plate and an extending direction of the third light guiding plate;

the second light guide plate comprises an adjacent light incident surface and an adjacent light emergent surface, the third light guide plate comprises an adjacent light incident surface and an adjacent light emergent surface, the light incident surface of the third light guide plate faces towards the light emergent surface of the second light guide plate, and the light emergent surface of the third light guide plate is positioned on the outer peripheral surface of the third light guide plate.

The beneficial effects of the invention are as follows: through the setting of infrared emission structure, with infrared initiative projection to waiting to gather on the object, infrared light and the visible light that waits to gather object reflection enter into together select the light structure, then enter into through the leaded light effect of leaded light structure the detector forms 3D target image, has improved the light transmissivity of select the light structure, and the effectual light inflow that has solved is little, and exposure time is long, can not gather in real time problem.

Drawings

Fig. 1 is a schematic structural view showing a 3D image capturing apparatus in the related art;

FIG. 2 shows a schematic diagram of a light selecting structure;

Fig. 3 is a schematic diagram showing a part of a structure of a 3D image capturing device according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a 3D image capturing device according to an embodiment of the present invention;

Fig. 5 shows an image obtained by the light transmitting areas in the liquid crystal shutter being all in a light transmitting state;

Fig. 6 is a schematic view showing a part of the structure of a 3D image capturing device according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a 3D image capturing device according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of the coupling-in and coupling-out structures in an embodiment of the invention;

Fig. 9 is a schematic structural diagram of a 3D image capturing device according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a 3D image capturing device according to an embodiment of the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without the need for inventive faculty, are within the scope of the present disclosure, based on the described embodiments of the present disclosure.

Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

With the development of technology and the increasing requirement of terminal clients on product quality, the 3D visual detection is based on 2D data, and height information data is added, so that the requirements on measurement of height, volume, shape and the like can be met, and therefore, the 3D detection technology is more and more favored by industrial enterprises. The method has important significance and wide application prospect in the fields of industrial production control and sensing detection, machine vision, space remote sensing, medical diagnosis, social security and the like. For 3D display, 3D visual inspection corresponds to the inverse process, three-dimensional coordinate information of an object in real space can be obtained through 3D visual inspection, a three-dimensional picture is generated after computer processing, and then the three-dimensional picture is transmitted to a 3D display device for display.

In the related art, the 3D visual detection technology can be implemented by a plurality of light field cameras, and the light field cameras acquire the picture information of different positions to generate the digital signal for 3D display, however, on one hand, due to the limitation of physical intervals, the interval between two light field cameras cannot be too small, the picture of the position between the cameras can only be generated by algorithm calculation and interpolation, and a large amount of calculation is required and is not accurate enough, on the other hand, the required number of light field cameras is too large, so that the large area at the upper end of the screen is occupied, the attractiveness is influenced, and meanwhile, the cost is increased.

In a light field camera scheme in the related art, the liquid crystal switch structure is utilized to realize the function of continuous Kong Xuanguang, different light rays enter the same camera detector through the light guide layer, and the number of cameras is effectively reduced. Referring to fig. 1, the light field camera comprises a light selecting structure 30 with a liquid crystal switch, a light guiding structure 20 and a detector 10, only one of said detectors 10 in fig. 1 being used for image acquisition and imaging. The light guiding structure 20 includes a light inlet 21 and a light outlet 22 opposite to each other, the light outlet 22 is opposite to the detector 10, light enters the light guiding structure 20 through the light inlet 21, and is reflected and diffracted in the light guiding structure 20, when encountering the light outlet 22, the light is emitted from the light outlet 22, and the detector 10 acquires the light and performs imaging. The light selecting structure 30 is disposed at the light inlet 21 of the light guiding structure 20, the light selecting structure 30 is provided with a liquid crystal switch, by controlling the liquid crystal switch, incident light rays in different areas can enter the light guiding structure 20 through the light inlet 21, the incident light rays are reflected or diffracted in the light guiding structure 20, when the incident light rays are reflected or diffracted to the light outlet 22, the incident light rays are emitted out of the light guiding structure 20 through the light outlet 22 and enter the detector 10, and the detector 10 performs imaging according to the incident light rays.

According to the light field camera scheme, the liquid crystal structure is utilized to realize the function of continuous Kong Xuanguang, so that the parallax image acquisition density is improved, and the precision of three-dimensional reconstruction information is improved; the same object is observed through a plurality of viewpoints, so that the detector 10 can perform three-dimensional imaging on different viewpoints of the same object, the imaging is simple and efficient, the number of the detectors 10 is effectively reduced, the cost is reduced, and the occupied area of the detector is reduced. . However, in this solution, a liquid crystal switch structure is used as a light selecting structure, polarizers (referring to fig. 2, two opposite sides of the liquid crystal 303 include a first polarizer 301 and a second polarizer 302) are attached to the upper and lower surfaces of the liquid crystal cell, and light control and light selection are implemented through liquid crystal deflection. The light efficiency after passing through the lower polaroid is about 46%, the liquid crystal efficiency is about 80%, the final light efficiency is about 36.8%, the transmittance of the light is low, the exposure time is increased, in addition, the opening of the liquid crystal switch is smaller, the light inlet amount is also small, the exposure time is further increased, and the light field camera scheme for collecting continuous image points of the liquid crystal switch cannot collect the light field image.

Referring to fig. 3 and 4, in order to solve the above problems, the present embodiment provides a 3D image acquisition device, including a detector 1, a light guiding structure, a light selecting structure 4, and an infrared emitting structure 5, where the light selecting structure 4 and the infrared emitting structure 5 are located between the light guiding structure and an object 100 to be acquired;

the infrared emitting structure 5 is configured to emit infrared light to the object to be acquired 100;

The light selecting structure 4 is configured to receive infrared light and visible light reflected by the object to be collected 100, and select incident light rays in different areas to enter the light guiding structure;

the light guiding structure is configured to guide light rays exiting the light selecting structure 4 to the detector 1 to form a 3D target image.

Through the setting of infrared emission structure 5, with infrared initiative projection to wait to gather on the object 100, the infrared light and the visible light that wait to gather object 100 reflection enter into together select light structure 4, then enter into through the leaded light effect of leaded light structure detector 1 forms 3D target image, has improved the light transmissivity of select light structure 4, especially for the select light structure based on liquid crystal, the effectual light input volume of having solved is few, the exposure time is long, can not gather in real time the problem.

In an exemplary embodiment, the infrared emission structure 5 includes a plurality of LED beads located at one side of the light selection structure 4.

In an exemplary embodiment, the light selecting structure 4 includes a liquid crystal diaphragm (i.e., a liquid crystal switch), where the liquid crystal diaphragm includes a plurality of light-transmitting areas 41 arranged at intervals along a first direction, and a plurality of the LED beads are arranged along the first direction.

By adopting the above scheme, a plurality of LED lamp beads and a plurality of light-transmitting areas 41 are arranged in parallel, so that the infrared light reflected by the object 100 to be collected can enter the light-transmitting areas 41.

It should be noted that, the number of the plurality of LED light beads may be set according to actual needs, so as to ensure that the infrared light reflected by the object to be collected 100 can be incident from all the light-transmitting areas 41, and in the first direction, the arrangement length of the plurality of LED light beads is greater than or equal to the arrangement length of the plurality of light-transmitting areas 41.

In an exemplary embodiment, the infrared emission structure 5 emits infrared light with a wavelength band of 780-1000nm, and the infrared lamp beads in the wavelength band have no brightness, so that the infrared lamp beads are more concealed and are not easy to be seen by human eyes. In a specific embodiment, the wavelength band of the infrared light emitted by the infrared emitting structure 5 is 940nm.

Illustratively, the light selecting structure 4 includes a liquid crystal diaphragm, where the liquid crystal diaphragm includes a plurality of light transmitting areas 41 arranged at intervals along a first direction, the light selecting structure 4 includes a first transparent substrate, a second transparent substrate, and a liquid crystal layer disposed between the first transparent substrate and the second transparent substrate, where a first transparent electrode is disposed on the first transparent substrate, and a second transparent electrode is disposed on the second transparent substrate, and the light selecting structure 4 further includes a control unit for providing an electrical signal to the first transparent electrode and/or the second transparent electrode to change the light transmittance of the liquid crystal of the corresponding light transmitting area 41.

The first transparent substrate and the second transparent substrate are preferably glass substrates, but not limited thereto.

In an exemplary embodiment, the light guiding structure includes a mirror 3 and a lens assembly 2 located at the light emitting side of the light selecting structure 4, the mirror 3 is configured to reflect the light emitted from the light selecting structure 4 to the lens assembly 2, and the lens assembly 2 is configured to collect the light reflected by the mirror 3, so that the light reflected by the mirror 3 enters the detector 1.

In an exemplary embodiment, the mirror 3 is a MEMS mirror 3.

The MEMS mirror 3 has low power consumption, high response frequency, and fast rotation speed, and can meet the requirement of display refresh rate.

In an exemplary embodiment, the light guiding structure further includes a mirror 3 driving unit, and the mirror 3 driving unit is configured to control the mirror 3 to rotate, so that the light rays exiting from different regions of the light selecting structure 4 are incident on the lens assembly 2.

The reflecting mirror 3 is located at the light emitting side of the light selecting structure 4, the light emitted from the light transmitting area 41 in the light selecting structure 4 enters the lens assembly 2 after being reflected by the reflecting mirror 3, the positions of different light transmitting areas 41 are different, the angles of the light emitted from different light transmitting areas 41 are different, the reflecting mirror 3 is driven to control the reflecting mirror 3 to rotate, so that the incident angle of the light incident to the reflecting mirror 3 can be adjusted, and the light emitted from each light transmitting area 41 can be reflected to the lens assembly 2 by the reflecting mirror 3.

The specific structural form of the driving structure of the mirror 3 may be various, so long as the mirror 3 can be controlled to rotate, for example, the driving structure of the mirror 3 includes a plurality of links connected to edges of the mirror 3, and a cylinder capable of controlling the corresponding links to perform telescopic movement, and the rotation of the mirror 3 at a corresponding angle is achieved by controlling at least one link, and the rotation of the mirror 3 at any angle in a plurality of directions can be achieved.

Illustratively, the reflecting mirror 3 is located on the light incident side of the lens assembly 2, and the area of the orthographic projection of the reflecting mirror 3 on the lens assembly 2 is larger than the area of the lens assembly 2, so as to ensure that the light reflected by the reflecting mirror 3 enters the lens assembly 2.

In the 3D image capturing device of the present embodiment, a plurality of parallax images are obtained to obtain a 3D image, and if the detector 1 is located on the focal plane of the lens assembly 2, a plurality of complete images with different parallaxes cannot be obtained, so in order to avoid this problem, in an exemplary embodiment, the detector 1 is located on a side of the focal plane of the lens assembly 2 near or far from the mirror 3.

In an exemplary embodiment, the separation between the detector 1 and the focal plane of the lens assembly 2 is 6% -8% of the focal length of the lens assembly 2.

The distance between the detector 1 and the focal plane of the lens assembly 2 cannot be too great, otherwise the images of different parallaxes obtained are too blurred, so that the finally formed 3D image is blurred, which affects the viewing of the user. In some specific embodiments, the distance between the focal plane of the lens assembly 2 and the detector 1 is 7% of the focal length of the lens assembly 2, but not limited to, for example, the focal length of the lens assembly 2 is 14mm, and the distance between the focal plane of the lens assembly 2 and the detector 1 is 1mm.

The detector 1 may be a CCD detector 1 or a CMOS detector 1, for example.

It should be noted that the number of the detectors 1 may be one or more, and when the detectors 1 include a plurality of detectors, a plurality of the detectors 1 are arranged side by side at intervals, and each detector 1 is responsible for image acquisition of an area.

Referring to fig. 6, in some embodiments, a plano-convex lens 7 is disposed between the infrared emission structure 5 (only the infrared LED lamp beads 51 are shown in fig. 6) and the object to be collected 100, a plane of the plano-convex lens 7 is disposed toward the infrared emission structure 5, and a concave surface of the plano-convex lens 7 is disposed toward the object to be collected.

The plano-convex lens 7 plays a role in dispersing infrared light emitted by the infrared emission structure, so that infrared light with a larger area can be irradiated to the surface of a 3D object to be collected, and the number of required infrared LED lamp beads (the infrared emission structure 5 comprises a plurality of LED lamp beads positioned on one side of the light selection structure 4) can be effectively reduced.

Illustratively, the distance between the plano-convex lens 7 and the infrared emitting structure 5 is less than or equal to the focal length of the plano-convex lens 7.

Referring to fig. 7, an exemplary light guiding structure includes a first light guiding plate 8 located on a light emitting side of the light selecting structure 4, where the first light guiding plate 8 includes a light incident surface disposed toward the light selecting structure 4 and a light emitting surface disposed opposite to the light incident surface, where a coupling-in structure is disposed on the light incident surface, and a coupling-out structure is disposed on the light emitting surface.

In this embodiment, the first light guide plate 8 is an optical waveguide substrate, which is well known, and has the advantages of small volume and large chromatic aberration, but the wavelength band of the infrared light emitted by the infrared emission structure of this embodiment is 780 nm-1000 nm, so that the chromatic aberration effect of the waveguide caused by the wide wavelength spectrum can be effectively reduced, and therefore, the chromatic aberration problem of the optical waveguide substrate is smaller in this scheme.

For example, the coupling-in structure may be a coupling-in grating for reflecting or diffracting incident light towards the coupling-out structure, and the coupling-out structure may be a coupling-out grating for outputting incident light towards the detector such that the detector receives the light and images it.

The light selecting structure 4 includes a liquid crystal diaphragm (i.e. a liquid crystal switch), where the liquid crystal diaphragm includes a plurality of light transmitting areas 41 arranged at intervals along a first direction, the coupling-in structures 81 and the coupling-out structures 82 are arranged at intervals along the first direction (refer to X direction in fig. 8), the extending direction of the coupling-in structures 81 forms an included angle with the first direction, and the coupling-out structures 82 are perpendicular to the first direction, so that the light transmitting areas can be continuously changed in the first direction on one hand, and selection of obtaining images of an object to be collected in different positions (similar to viewing of eyes in different positions) is achieved, meanwhile, light energy and information loss caused by the incident light encountering the coupling-in structures during the propagation of the light guiding structures can be avoided, and then when reaching the detector position, the light is transmitted to a specific coupling-out position through the propagation of the coupling-out structures and is accepted by the detector.

Referring to fig. 9, the light selecting structure 4 includes a liquid crystal diaphragm (i.e., a liquid crystal switch), where the liquid crystal diaphragm includes a plurality of light transmitting areas 41 arranged at intervals along a first direction (refer to an X direction in fig. 9), the light guiding structure includes a second light guiding plate 9 and a third light guiding plate 40 located on a light emitting side of the light selecting structure 4, the second light guiding plate 9 and the third light guiding plate 40 are located on the same plane (i.e., are arranged on the same layer), and an angle is formed between an extending direction of the second light guiding plate 9 and an extending direction of the third light guiding plate 40, and in some specific embodiments, the second light guiding plate 9 is arranged perpendicular to the first direction, and the third light guiding plate 40 is arranged parallel to the first direction;

The second light guide plate 9 includes an adjacent light incident surface and an adjacent light emergent surface, the third light guide plate 40 includes an adjacent light incident surface and an adjacent light emergent surface, the light incident surface of the third light guide plate 40 faces the light emergent surface of the second light guide plate 9, and the light emergent surface of the third light guide plate 40 is located on the outer peripheral surface of the third light guide plate.

In fig. 9, a first transparent substrate 41 and a second transparent substrate 42 included in the light selecting structure 4 are shown, and the second light guiding plate 9 and the third light guiding plate 40 are located on a side of the second transparent substrate 42 away from the first transparent substrate 41.

The detector 1, the second light guide plate 9 and the third light guide plate 40 are arranged on the same layer, so that the 3D image acquisition device can be thinned.

Referring to fig. 10, in some embodiments, in order to flexibly arrange the detector 1, a reflecting mirror 50 is arranged between the detector 1 and the third light guide plate 40.

It should be noted that the number of the second light guide plates 40 may be set according to actual needs, and fig. 9 and 10 only illustrate 4 second light guide plates 40 arranged side by side, but not limited thereto.

The number of the second light guide plates 40 is the same as the number of the light-transmitting areas on the light-selecting structure, and a plurality of the second light guide plates are disposed in one-to-one correspondence with a plurality of the light-transmitting areas.

The number of the plano-convex lenses may be set according to practical needs, and the number of the plano-convex lenses in fig. 9 and 10 is 2, but not limited thereto.

Referring to fig. 3, in an exemplary embodiment, the 3D image acquisition device further comprises a display structure 6 for displaying the 3D image formed by the detector 1.

Illustratively, the display structure 6 and the light selecting structure 4 are integrally provided as a unitary structure.

Illustratively, the 3D image capturing device includes a liquid crystal display panel, which includes a display area as the display structure 6 and the light selecting area as the light selecting structure 4.

By adopting the scheme, the light selecting structure 4 and the display structure 6 can share one display panel, so that the use is more convenient, and the whole structure is more attractive.

The light selecting region may be located at an upper portion or a lower portion of the display region, and a specific location is not particularly limited herein.

The light guide structure and the detector 1 are disposed on the backlight side of the liquid crystal display panel.

The liquid crystal display panel comprises a first transparent substrate, a second transparent substrate and a liquid crystal layer, wherein the first transparent substrate, the second transparent substrate and the liquid crystal layer are oppositely arranged, the liquid crystal layer is positioned between the first transparent substrate and the second transparent substrate, a first polaroid is arranged on one side, away from the second transparent substrate, of the first transparent substrate, and a second polaroid is arranged on one side, away from the first substrate, of the second transparent substrate.

In specific implementation, the first polarizer, the first substrate, the liquid crystal layer, the second substrate and the second polarizer in the liquid crystal display panel are sequentially arranged along the light incident direction. Wherein the first substrate and the second substrate are transparent substrates, and the glass substrate is preferred in this embodiment.

And a color film layer is arranged at the part corresponding to the first transparent substrate in the display area, and a backlight module is arranged at one side, away from the first transparent substrate, of the part corresponding to the second transparent substrate, so that the display area can normally play the picture content.

And in the light selection area, a color film layer is not arranged at the corresponding part of the first transparent substrate, so that the first transparent substrate is in a pure-color transparent state, and the light transmission effect is ensured.

The light selecting area comprises a plurality of transparent areas, a first transparent electrode is arranged on one side, facing the second transparent substrate, of the first transparent substrate, a second transparent electrode is arranged on one side, facing the first transparent electrode, of the second transparent electrode, the first transparent electrode or the second transparent electrode can be a plurality of block electrodes or strip electrodes corresponding to the transparent areas, electric signals are provided for the first transparent electrode and the second transparent electrode, an electric field of a liquid crystal layer is changed, the deflection angle of liquid crystal is changed, the light transmittance of a corresponding light transmitting area is increased, or the light transmittance of the corresponding light transmitting area is reduced, so that the opening and closing of the corresponding transparent area are controlled, light rays of different areas enter the light guiding structure, images with different parallaxes are obtained, and finally a 3D image is formed.

For example, the first transparent electrode or the second transparent electrode may be made of a transparent metal, such as ITO (indium tin oxide), but not limited thereto.

The light selecting area is provided with a plurality of light transmitting areas 41 arranged along a first direction, the first direction is parallel to the display surface of the liquid crystal display panel, the liquid crystal display panel is provided with an infrared transmitting structure 5, the infrared transmitting structure 5 is positioned on the display surface of the liquid crystal display panel, in a second direction, the light selecting area is close to one side of the display area, or one side of the light selecting area far away from the display area is provided with the infrared transmitting structure 5, the second direction is perpendicular to the second direction, and the second direction is parallel to the display surface of the liquid crystal display panel.

Illustratively, the light selecting structure 3 includes a liquid crystal aperture, and fig. 5 shows an obtained 3D image frame in which all light transmitting areas on the liquid crystal aperture are fully opened (72 total).

The opening and closing of the plurality of light-transmitting regions are independently controlled.

In addition, the response time of the liquid crystal diaphragm is very important for acquiring in real time, so the response time of the liquid crystal diaphragm is tested, and the response time of the test sample (namely the light selecting structure) in the embodiment is as follows: rising edge average time 7.5s, falling edge average time 6.5s; the test sample response times add up to 14s, meeting the display requirement at a frequency of 60 Hz.

The following points need to be described:

(1) The drawings of the embodiments of the present disclosure relate only to the structures related to the embodiments of the present disclosure, and other structures may refer to the general design.

(2) In the drawings for describing embodiments of the present disclosure, the thickness of layers or regions is exaggerated or reduced for clarity, i.e., the drawings are not drawn to actual scale. It will be understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element or intervening elements may be present.

(3) The embodiments of the present disclosure and features in the embodiments may be combined with each other to arrive at a new embodiment without conflict.

It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.

Claims (14)

1. The 3D image acquisition device is characterized by comprising a detector, a light guide structure, a light selecting structure and an infrared emission structure, wherein the light selecting structure and the infrared emission structure are positioned between the light guide structure and an object to be acquired;

the infrared emission structure is configured to emit infrared light to an object to be acquired;

The light selecting structure is configured to receive infrared light and visible light reflected by an object to be collected and select incident light rays in different areas to enter the light guiding structure;

the light guiding structure is configured to guide light rays exiting the light selecting structure to the detector to form a 3D target image.

2. The 3D image acquisition device of claim 1, wherein the infrared emission structure comprises a plurality of LED light beads located on one side of the light selection structure.

3. The 3D image capturing device according to claim 2, wherein the light selecting structure comprises a liquid crystal diaphragm, the liquid crystal diaphragm comprises a plurality of light transmitting areas arranged at intervals along a first direction, and a plurality of the LED light beads are arranged along the first direction.

4. The 3D image capturing device according to claim 1, wherein the infrared emission structure emits infrared light in a wavelength band of 780-1000nm.

5. The 3D image capturing device according to claim 1, wherein the light guiding structure comprises a mirror and a lens assembly at a light emitting side of the light selecting structure, the mirror is configured to reflect light emitted from the light selecting structure to the lens assembly, and the lens assembly is configured to collect light reflected by the mirror so that light reflected by the mirror enters the detector.

6. The 3D image acquisition device of claim 5, wherein the mirror is a MEMS mirror.

7. The 3D image capturing device of claim 5, wherein the light guiding structure further comprises a mirror driving unit for controlling the mirror to rotate such that light rays exiting from different regions of the light selecting structure are incident to the lens assembly.

8. The 3D image acquisition device of claim 5, wherein the detector is located on a side of the focal plane of the lens assembly that is closer to or farther from the mirror.

9. The 3D image acquisition device of claim 8, wherein a spacing between the detector and a focal plane of the lens assembly is 6% -8% of a focal length of the lens assembly.

10. The 3D image acquisition device of claim 8, further comprising a display structure for displaying the 3D image formed by the detector.

11. The 3D image capturing device according to claim 1, wherein a plano-convex lens is arranged between the infrared emission structure and the object to be captured, a plane of the plano-convex lens is arranged towards the infrared emission structure, and a concave surface of the plano-convex lens is arranged towards the object to be captured.

12. The 3D image acquisition device according to claim 11, wherein a distance between the plano-convex lens and the infrared emitting structure is less than or equal to a focal length of the plano-convex lens.

13. The 3D image capturing device according to claim 1, wherein the light guiding structure comprises a first light guiding plate located at a light emitting side of the light selecting structure, the first light guiding plate comprises a light incident surface arranged towards the light selecting structure and a light emitting surface opposite to the light incident surface, the light incident surface is provided with a coupling-in structure, and the light emitting surface is provided with a coupling-out structure.

14. The 3D image capturing device according to claim 1, wherein the light guiding structure comprises a second light guiding plate and a third light guiding plate located at a light emitting side of the light selecting structure, the second light guiding plate and the third light guiding plate are located on the same plane, and an included angle is formed between an extending direction of the second light guiding plate and an extending direction of the third light guiding plate;

the second light guide plate comprises an adjacent light incident surface and an adjacent light emergent surface, the third light guide plate comprises an adjacent light incident surface and an adjacent light emergent surface, the light incident surface of the third light guide plate faces towards the light emergent surface of the second light guide plate, and the light emergent surface of the third light guide plate is positioned on the outer peripheral surface of the third light guide plate.