CN113671768B - Phased array laser scanning device and control method thereof - Google Patents
Phased array laser scanning device and control method thereof Download PDFInfo
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- CN113671768B CN113671768B CN202010408200.6A CN202010408200A CN113671768B CN 113671768 B CN113671768 B CN 113671768B CN 202010408200 A CN202010408200 A CN 202010408200A CN 113671768 B CN113671768 B CN 113671768B
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- 238000000034 method Methods 0.000 title abstract description 21
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 95
- 239000000758 substrate Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 8
- 239000004983 Polymer Dispersed Liquid Crystal Substances 0.000 claims description 6
- 239000004020 conductor Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 abstract description 6
- 230000005684 electric field Effects 0.000 description 15
- 230000008859 change Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 4
- -1 indium tin metal oxide Chemical class 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 229920000106 Liquid crystal polymer Polymers 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical class [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
- G02F1/292—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection by controlled diffraction or phased-array beam steering
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
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- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal (AREA)
Abstract
The present disclosure relates to a phased array laser scanning device and a control method thereof, the phased array laser scanning device including a first transparent conductive film, a liquid crystal dimming film, a second transparent conductive film, and a power supply control unit; the liquid crystal dimming film is positioned between the first transparent conductive film and the second transparent conductive film; the first/second transparent conductive film has a plurality of first/second electrodes parallel to the first/second directions; the power supply control unit is connected with the first electrode and the second electrode and is used for determining a target area according to the target interval; determining a first target electrode and a second target electrode to be electrified in the first electrode and the second electrode according to the target area; the first/second target electrodes are energized to cause the target area to assume a transparent state. The transparent electrodes which are staggered in parallel on the two sides of the liquid crystal dimming film can be electrified to adjust the positions of the transparent areas on the scanning device and form different intervals, so that the emergence angle of incident light is controlled, the flexibility and the accuracy of angle control are improved, and the power consumption and the preparation cost of the scanning device are reduced.
Description
Technical Field
The disclosure relates to the technical field of laser radar scanning, in particular to a phased array laser scanning device and a control method thereof.
Background
Because the wavelength of the laser is shorter, when the laser is used for detection, the detection precision and resolution are greatly improved, and the target recognition capability and the anti-interference capability are also greatly enhanced. Therefore, the laser radar technology is widely applied to the technical fields of target detection, satellite positioning, map mapping and the like. In the laser radar technology, accurate control of angle change during laser scanning is important for improving detection accuracy. In the prior art, an optical machine scanning mode is adopted to control angle change, namely, laser emitted by a laser device generates diffraction after passing through an optical machine scanning device, and the diffraction angle of the laser is adjusted through modes of a rotating mirror, a swinging mirror, a vibrating mirror and the like, so that the change of the scanning angle during laser detection is realized. However, the optical scanning device has large volume and large mechanical inertia, is difficult to flexibly and accurately control the change of the scanning angle, so that the scanning speed is low, the power consumed by the system is high, the performance of the system is limited, the preparation process of the optical scanning laser radar is complex, and the production cost is high.
Disclosure of Invention
To overcome the problems in the related art, the present disclosure provides a phased array laser scanning and a control method thereof.
According to a first aspect of embodiments of the present disclosure, there is provided a phased array laser scanning apparatus comprising: a first transparent conductive film, a liquid crystal dimming film, a second transparent conductive film, and a power supply control unit;
the liquid crystal dimming film is positioned between the first transparent conductive film and the second transparent conductive film;
at least two first electrodes which are arranged in parallel along a first direction are arranged in the first transparent conductive film and are used for carrying out azimuth angle treatment on incident light in cooperation with the liquid crystal dimming film and the second transparent conductive film;
at least two second electrodes which are arranged in parallel along a second direction are arranged in the second transparent conductive film and are used for emitting emergent light subjected to azimuth angle treatment, and a non-obtuse included angle between the first direction and the second direction is a preset angle;
the power supply control unit is respectively connected with the first electrode and the second electrode and is used for:
determining a target area on the liquid crystal dimming film according to a target interval of the phased array laser scanning device;
determining a first target electrode to be electrified in the first electrode and a second target electrode to be electrified in the second electrode according to the target area;
and respectively electrifying the first target electrode and the second target electrode so as to enable the target area to be in a transparent state.
Optionally, the first electrode and the second electrode are strip electrodes.
Optionally, the width of the strip electrode is between 0.01um and 100 um; the interval between each strip electrode in the first transparent conductive film and the second transparent conductive film is between 0.01um and 100 um.
Optionally, the materials of the first electrode and the second electrode are transparent conductive materials.
Optionally, the scanning device further includes: a first substrate and a second substrate;
the first transparent conductive film is positioned between the first substrate and the liquid crystal dimming film;
the second transparent conductive film is located between the second substrate and the liquid crystal dimming film.
Optionally, the material of the liquid crystal dimming film is polymer dispersed liquid crystal.
According to a second aspect of the embodiments of the present disclosure, there is provided a control method of a phased array laser scanning apparatus, applied to the phased array laser scanning apparatus, the phased array laser scanning apparatus including: a first transparent conductive film, a liquid crystal dimming film, a second transparent conductive film, and a power supply control unit; the liquid crystal dimming film is positioned between the first transparent conductive film and the second transparent conductive film; at least two first electrodes arranged in parallel along a first direction are arranged in the first transparent conductive film; at least two second electrodes which are arranged in parallel along a second direction are arranged in the second transparent conductive film, and an included angle which is not an obtuse angle between the first direction and the second direction is a preset angle; the power supply control unit is respectively connected with the first electrode and the second electrode; the control method comprises the following steps:
receiving incident light emitted by a laser;
determining a target area on the liquid crystal dimming film according to a target interval of the phased array laser scanning device;
determining a first target electrode to be electrified in the first electrode and a second target electrode to be electrified in the second electrode according to the target area;
energizing the first target electrode and the second target electrode respectively to enable the target area to be in a transparent state;
and carrying out laser scanning on emergent light emitted by the incident light after passing through the first transparent conductive film, the liquid crystal dimming film and the second transparent conductive film.
Optionally, the determining the target area on the liquid crystal dimming film according to the target interval of the phased array laser scanning device includes:
determining a target interval of the scanning device according to the wavelength of the incident light and a target exit angle;
and determining a target area on the liquid crystal dimming film according to the corresponding relation between the preset interval and the area on the liquid crystal dimming film.
Optionally, the target exit angle includes a first target exit angle and a second target exit angle, and the target interval includes a first target interval and a second target interval; the determining the target interval of the scanning device according to the wavelength of the incident light and the target exit angle comprises the following steps:
determining the first target interval according to the wavelength of the incident light and the first target exit angle;
and determining the second target interval according to the wavelength of the incident light and the second target exit angle.
Optionally, the determining, according to the target area, a first target electrode to be electrified in the first electrode and a second target electrode to be electrified in the second electrode includes:
determining the first target electrode according to the projection area of the target area on the first electrode;
and determining the second target electrode according to the projection area of the target area on the second electrode.
In summary, the present invention provides a phased array laser scanning apparatus and a control method thereof, the phased array laser scanning apparatus including: a first transparent conductive film, a liquid crystal dimming film, a second transparent conductive film, and a power supply control unit; the liquid crystal dimming film is positioned between the first transparent conductive film and the second transparent conductive film; at least two first electrodes which are arranged in parallel along a first direction are arranged in the first transparent conductive film and are used for carrying out azimuth angle treatment on incident light in cooperation with the liquid crystal dimming film and the second transparent conductive film; at least two second electrodes which are arranged in parallel along a second direction are arranged in the second transparent conductive film and are used for emitting emergent light subjected to azimuth angle treatment, and a non-obtuse included angle between the first direction and the second direction is a preset angle; the power supply control unit is respectively connected with the first electrode and the second electrode and is used for: determining a target area on the liquid crystal dimming film according to a target interval of the phased array laser scanning device; determining a first target electrode to be electrified in the first electrode and a second target electrode to be electrified in the second electrode according to the target area; the first target electrode and the second target electrode are respectively electrified so that the target area presents a transparent state. The transparent electrodes which are staggered in parallel on the two sides of the liquid crystal dimming film can be electrified to adjust the positions of the transparent areas on the scanning device and form different intervals, so that the emergent angle of the emergent angle emitted by the incident light after passing through the scanning device is controlled, the flexibility and the accuracy of angle control are improved, and the power consumption and the preparation cost of the scanning device are reduced.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a schematic diagram of a phased array laser scanning apparatus according to an exemplary embodiment;
FIG. 2 is a flow chart illustrating a method of controlling a phased array laser scanning apparatus according to an example embodiment;
FIG. 3 is a flow chart of a powered electrode determining method according to the one shown in FIG. 2;
FIG. 4 is a schematic diagram illustrating a method of controlling a phased array laser scanning apparatus according to an example embodiment;
fig. 5 is a schematic diagram illustrating another control method of a phased array laser scanning apparatus according to an example embodiment.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
Fig. 1 is a schematic structural view of a phased array laser scanning apparatus according to an exemplary embodiment, and as shown in fig. 1, the phased array laser scanning apparatus 100 includes: a first transparent conductive film 101, a liquid crystal light adjusting film 102, a second transparent conductive film 103, and a power supply control unit 104; the liquid crystal dimming film 102 is located between the first transparent conductive film 101 and the second transparent conductive film 103; at least two first electrodes 105 arranged in parallel along a first direction are disposed in the first transparent conductive film 101 for performing azimuth angle processing of incident light in cooperation with the liquid crystal light adjusting film 102 and the second transparent conductive film 103; at least two second electrodes 106 arranged in parallel along a second direction are arranged in the second transparent conductive film 103, and are used for emitting outgoing light subjected to azimuth treatment, and an included angle between the first direction and the second direction which is not obtuse is a preset angle; the power supply control unit 104 is connected to the first electrode 105 and the second electrode 106, respectively, for: determining a target area on the liquid crystal dimming film 102 according to a target interval of the phased array laser scanning apparatus 100; determining a first target electrode to be electrified in the first electrode 105 and a second target electrode to be electrified in the second electrode 106 according to the target area; the first target electrode and the second target electrode are respectively electrified so that the target area presents a transparent state.
The first electrode 105 and the second electrode 106 are stripe-shaped electrodes, the width of the stripe-shaped electrodes is between 0.01um and 100um, and the interval between each stripe-shaped first electrode 105 and each stripe-shaped second electrode 106 in the first conductive film 101 and the second transparent conductive film 103 is also between 0.01um and 100 um. The material of the first electrode 105 and the second electrode 106 may be nano silver wire, nano indium tin metal oxide (Indium Tin Oxides, abbreviated as ITO) or other transparent conductive material.
For example, the liquid crystal dimming film 102 is in an opaque state under the condition of no electric field, and when the electric field passes, liquid crystal molecules inside the liquid crystal dimming film 102 are orderly arranged under the action of the electric field, so that the liquid crystal dimming film 102 is in a transparent state. In the embodiment of the disclosure, the first transparent conductive film 101 including a plurality of first electrodes 105 and the second transparent conductive film 103 including a plurality of second electrodes 106 are respectively disposed on two sides of the liquid crystal dimming film 102, and the first transparent conductive film 101 and the second transparent conductive film 103 are respectively attached to the liquid crystal dimming film 102. Each of the first electrode 105 and the second electrode 106 is led out through a wire and connected to the power supply control unit 104, respectively, the power supply control unit 104 selects a first target electrode among the first electrodes 105 to be electrified, selects a second target electrode among the second electrodes 106 to be electrified, and forms an electric field between the electrified first target electrode and second target electrode, so that a region (i.e., a target region) where the electric field passes in the liquid crystal dimming film 102 presents a transparent state. By energizing the first target electrode and the second target electrode at different positions, the position of the transparent region on the liquid crystal light adjusting film 102 can be adjusted, so that the phased array laser scanner 100 forms modulation structures with different intervals. The laser light (i.e., incident light) emitted by the laser passes through the phased array laser scanning apparatus 100 to form a plurality of spots on the diffraction screen. It will be appreciated that the regions of transparent states and regions of opaque states on the modulating structure alternate, the spacing being used to represent the distance between the regions of transparent states arranged in parallel along a first direction and/or the distance between the regions of transparent states arranged in parallel along a second direction.
The material of the liquid crystal dimming film 102 is polymer dispersed liquid crystal (Polymer Dispersed Liquid Crystal, abbreviated as PDLC), which is a material obtained by mixing low-molecular liquid crystal with prepolymer glue, performing polymerization reaction under certain conditions to form micron-sized liquid crystal droplets which are uniformly dispersed in a polymer network, and then obtaining the material with electro-optic response characteristic by utilizing dielectric anisotropy of liquid crystal molecules. The PDLC has an advantage of a fast response speed, and when the first and second target electrodes are energized, the region where the surface of the liquid crystal dimming film 102 exhibits a transparent state and the region where it does not exhibit a transparent state can be rapidly switched. By changing the distribution density of the first electrodes 105 on the first transparent conductive film 101 and the distribution density of the second electrodes 106 on the second transparent conductive film 103 (i.e., changing the width of each first electrode 105 and each second electrode 106 and/or the interval between each electrode described above), and adjusting the first target electrode and the second target electrode to be energized, a continuous change in the interval in the two-dimensional direction can be achieved, thereby controlling a continuous change in the angle of emitted light.
In addition, as shown in fig. 1, the included angle (i.e., the preset angle) between the first direction and the second direction is 90 °, that is, when an electric field passes through the liquid crystal dimming film 102, the phased array laser scanning apparatus 100 can form a two-dimensional orthogonal modulation structure. By adjusting the angle of the non-obtuse included angle, the phased array laser scanning apparatus 100 can form two-dimensional modulation structures with different structures and different intervals.
In addition, the scanning device 100 further includes: a first substrate 107 and a second substrate 108; the first transparent conductive film 101 is located between the first substrate 107 and the liquid crystal dimming film 102; the second transparent conductive film 103 is located between the second substrate 108 and the liquid crystal dimming film 102. The first substrate 107 and the second substrate 108 are made of polyethylene terephthalate (Polyethylene terephthalate, abbreviated as PET), glass or other transparent materials, and are respectively attached to the first transparent conductive film 101 and the second transparent conductive film 103, so as to perform protection and isolation functions.
In summary, the phased array laser scanning device provided by the present invention includes: a first transparent conductive film, a liquid crystal dimming film, a second transparent conductive film, and a power supply control unit; the liquid crystal dimming film is positioned between the first transparent conductive film and the second transparent conductive film; at least two first electrodes which are arranged in parallel along a first direction are arranged in the first transparent conductive film and are used for carrying out azimuth angle treatment on incident light in cooperation with the liquid crystal dimming film and the second transparent conductive film; at least two second electrodes which are arranged in parallel along a second direction are arranged in the second transparent conductive film and are used for emitting emergent light subjected to azimuth angle treatment, and a non-obtuse included angle between the first direction and the second direction is a preset angle; the power supply control unit is respectively connected with the first electrode and the second electrode and is used for: determining a target area on the liquid crystal dimming film according to a target interval of the phased array laser scanning device; determining a first target electrode to be electrified in the first electrode and a second target electrode to be electrified in the second electrode according to the target area; the first target electrode and the second target electrode are respectively electrified so that the target area presents a transparent state. The position of the transparent state area on the scanning device can be adjusted and different intervals can be formed by electrifying the transparent electrodes which are parallelly staggered on the two sides of the liquid crystal dimming film, the emergent angle of emergent light emitted by incident light after passing through the scanning device is controlled, the flexibility and accuracy of angle control are improved, and the power consumption and the preparation cost of the scanning device are reduced.
Fig. 2 is a flowchart illustrating a control method of a phased array laser scanning apparatus according to an exemplary embodiment, as shown in fig. 2, applied to the phased array laser scanning apparatus, the phased array laser scanning apparatus including: a first transparent conductive film, a liquid crystal dimming film, a second transparent conductive film, and a power supply control unit; the liquid crystal dimming film is positioned between the first transparent conductive film and the second transparent conductive film; at least two first electrodes arranged in parallel along a first direction are arranged in the first transparent conductive film; at least two second electrodes which are arranged in parallel along a second direction are arranged in the second transparent conductive film, and an included angle between the first direction and the second direction which is not an obtuse angle is a preset angle; the power supply control unit is respectively connected with the first electrode and the second electrode; the method comprises the following steps:
in step 201, incident light emitted by a laser is received.
For example, in the laser radar technology for detecting by using laser, a laser transmitter emits incident light, the incident light changes a rear azimuth angle through a phased array laser scanning device in the embodiment of the disclosure, so as to affect an angle of an exit angle, and the angle of the exit light is controlled through the following steps 202 to 204, so as to realize scanning of a detected object by the laser within a certain angle range.
In step 202, a target area on the liquid crystal dimming film is determined according to a target interval of the phased array laser scanning apparatus.
For example, when an electric field passes through, a part of the area on the liquid crystal dimming film (i.e., the area through which the electric field passes) is in a transparent state, and by adjusting the area on the liquid crystal dimming film in a transparent state (i.e., the area through which the electric field passes), the phased array liquid crystal scanning device can be formed into a modulation structure composed of alternately transparent and opaque areas. Therefore, if a plurality of groups of values are carried out on the transparent state area and the interval corresponding to the area, and the function fitting is carried out on the numerical value of each group of areas and the corresponding interval, the corresponding relation between the interval and the area on the liquid crystal dimming film can be obtained. According to the correspondence, a target interval is determined, and a target area on the liquid crystal dimming film corresponding to the target interval of the phased array liquid crystal scanning device can be obtained.
Specifically, determining the target area on the liquid crystal dimming film according to the target interval of the phased array laser scanning device includes: determining a target interval of the scanning device according to the wavelength of the incident light and a target exit angle; and determining a target area on the liquid crystal dimming film according to the corresponding relation between the preset interval and the area on the liquid crystal dimming film.
Illustratively, the exit angle of the incident light can be expressed by the following formula (1):
θ＝f(λ,d) (1)，
where θ is the exit angle, λ is the wavelength of the incident light, and d is the interval.
In the case where the wavelength of the incident light is λ, the exit angle θ depends on the interval d of the scanning device, and therefore, in order to set the value of the azimuth angle of the emitted light (i.e., the exit angle θ) of the incident light after passing through the phased array laser scanning device to be a target exit angle, it is necessary to set the interval of the phased array laser scanning device to be a target interval corresponding to the target exit angle, that is, to set the region of the liquid crystal light control film that exhibits a transparent state to be a target region.
In addition, since the electrodes in the phased array liquid crystal scanning device include the first electrodes arranged in parallel in the first direction and the second electrodes arranged in parallel in the second direction, the phased array liquid crystal scanning device forms the modulation structure as a two-dimensional modulation structure. The target exit angle includes a first target exit angle and a second target exit angle, the target interval includes a first target interval and a second target interval; determining a target interval of the scanning device according to the wavelength of the incident light and the target exit angle comprises: determining the first target interval according to the wavelength of the incident light and the first target exit angle; the second target interval is determined according to the wavelength of the incident light and the second target exit angle. And determining a target area on the liquid crystal dimming film according to the corresponding relation between the preset interval and the area on the liquid crystal dimming film.
In step 203, a first target electrode to be energized in the first electrode and a second target electrode to be energized in the second electrode are determined according to the target area.
For example, according to the structural characteristics of the liquid crystal dimming film (i.e. the region through which the electric field passes has a transparent state), after determining the target region, a first target electrode needs to be further determined in the first electrode, and a second target electrode needs to be determined in the second electrode, where the conditions that the first target electrode and the second target electrode need to satisfy are: the overlapping area of the first target electrode and the second target electrode projected on the liquid crystal dimming film is the target area.
In step 204, the first target electrode and the second target electrode are energized, respectively, to render the target area transparent.
Illustratively, the first target electrode and the second target electrode are respectively energized (live and neutral are typically provided respectively), an electric field is formed between a projected area of the target area on the first target electrode and a projected area of the target area on the second target electrode, and the target area on the liquid crystal dimming film exhibits a transparent state.
In step 205, laser scanning is performed according to the outgoing light emitted after the incoming light passes through the first transparent conductive film, the liquid crystal light adjusting film, and the second transparent conductive film.
For example, after the interval of the phased array laser scanning device is adjusted in steps 202 to 204, the azimuth angle of the outgoing light after the incident light passes through the modulation structure is adjusted, and at this time, the azimuth angle of the outgoing light emitted after the incident light passes through the first transparent conductive film, the liquid crystal dimming film and the second transparent conductive film is the target outgoing angle. The laser scanning can be performed on the detected object by the emitted light, so that as long as the target interval is continuously changed, the azimuth angle of the emitted light emitted by the incident light passing through the first transparent conductive film, the liquid crystal dimming film and the second transparent conductive film is also continuously changed, and the continuous scanning of the detected object in a certain angle range is realized.
Fig. 3 is a flowchart of a method of determining an energized electrode according to the method shown in fig. 2, and as shown in fig. 3, the step 203 includes:
in step 2031, the first target electrode is determined from the projected area of the target area at the first electrode.
In step 2032, the second target electrode is determined from the projected area of the target area at the second electrode.
Illustratively, the first and second electrodes are located in the first and second transparent conductive films, respectively, the first transparent conductive film, the second transparent conductive film, and the liquid crystal dimming film are not on the same plane. Therefore, after the target area on the liquid crystal dimming film is determined, the first target electrode is determined according to the projection area of the target area in the first electrode (namely, the electrode which is completely or partially covered by the projection of the target area in the first electrode is the first target electrode), and the second target electrode is determined according to the projection area of the target area in the second electrode (namely, the electrode which is completely or partially covered by the projection of the target area in the second electrode is the second target electrode).
In summary, the control method of the phased array laser scanning device provided by the invention is applied to the phased array laser scanning device, and the phased array laser scanning device comprises: a first transparent conductive film, a liquid crystal dimming film, a second transparent conductive film, and a power supply control unit; the liquid crystal dimming film is positioned between the first transparent conductive film and the second transparent conductive film; at least two first electrodes arranged in parallel along a first direction are arranged in the first transparent conductive film; at least two second electrodes which are arranged in parallel along a second direction are arranged in the second transparent conductive film, and an included angle between the first direction and the second direction which is not an obtuse angle is a preset angle; the power supply control unit is respectively connected with the first electrode and the second electrode, and the control method comprises the following steps: determining a target area on the liquid crystal dimming film according to a target interval of the phased array laser scanning device; determining a first target electrode to be electrified in the first electrode and a second target electrode to be electrified in the second electrode according to the target area; the first target electrode and the second target electrode are respectively electrified so that the target area presents a transparent state. The position of the transparent state area on the scanning device can be adjusted and different intervals can be formed by electrifying the transparent electrodes which are parallelly staggered on the two sides of the liquid crystal dimming film, the emergent angle of emergent light emitted by incident light after passing through the scanning device is controlled, the flexibility and accuracy of angle control are improved, and the power consumption and the preparation cost of the scanning device are reduced.
Fig. 4 is a schematic diagram showing a control method of a phased array laser scanning apparatus according to an exemplary embodiment, and as shown in fig. 4, a projection plane of the phased array laser scanning apparatus is taken in a direction perpendicular to a plane in which a first transparent conductive film is located. Wherein, the projection of the first electrode in the first transparent conductive film on the projection surface is represented by a solid line, and the first electrodes are arranged in parallel along the first direction; the projection of the second electrode in the second transparent conductive film on the projection surface is shown by a dotted line, and the second electrodes are arranged in parallel along the second direction. Each of the first electrode and the second electrode is distinguished by a serial number, and the positions of the overlapping portions of the projections of the first electrode and the second electrode on the projection plane are expressed in terms of coordinates, for example, the overlapping portion of the projections of the 4 th first electrode and the 3 rd second electrode on the projection plane is expressed as [4,3].
The 4 th, 8 th, 12 th and 16 th first electrodes and the 3 rd, 7 th, 11 th and 15 th second electrodes are electrified through the power supply control unit, at this time, an electric field is formed between each electrified first electrode and each electrified second electrode, and a region on the liquid crystal dimming film through which the electric field passes presents a transparent state. The overlapping portion of each energized first electrode and each energized second electrode projected on the projection surface is represented by coordinates as: [4,3], [8,3], [12,3], [16,3], [4,7], [8,7], [12,7], [16,7], [4,11], [8,11], [12,11], [16,11], [4,15], [8,15], [12,15] and [16,15], the region of the liquid crystal dimming film corresponding to the above coordinates is in a transparent state, and the scanning device forms a modulating structure. The interval of the one-dimensional modulation structure along the first direction of the scanning device is the width between 4 transparent electrodes on the surface of the modulation structure, the interval of the one-dimensional modulation structure along the second direction is the width between 4 transparent electrodes on the surface of the modulation structure, when laser passes through the scanning device, due to diffraction effect of the modulation structure, the emergent light azimuth angle appearing in the first direction is arcsin (lambda/4), and the emergent light azimuth angle appearing in the second direction is arcsin (lambda/4).
Fig. 5 is a schematic diagram showing another control method of a phased array laser scanning apparatus according to an exemplary embodiment, and as shown in fig. 5, a projection surface of the scanning apparatus is taken in a direction perpendicular to a plane in which the first transparent conductive film is located. Wherein, the projection of the first electrode in the first transparent conductive film on the projection surface is represented by a solid line, and the first electrodes are arranged in parallel along the first direction; the projection of the second electrode in the second transparent conductive film on the projection surface is shown by a dotted line, and the second electrodes are arranged in parallel along the second direction. Each of the first electrode and the second electrode is distinguished by a serial number, and the positions of the overlapping portions of the projections of the first electrode and the second electrode on the projection plane are expressed in terms of coordinates, for example, the overlapping portions of the projections of the 6 th first electrode and the 7 th second electrode on the projection plane are expressed as [6,7].
The 6 th and 12 th first electrodes are electrified and the 7 th and 12 th second electrodes are electrified through the power supply control unit, at this time, an electric field is formed between each electrified first electrode and each electrified second electrode, and the area of the liquid crystal dimming film, through which the electric field passes, is in a transparent state. The overlapping portion of each energized first electrode and each energized second electrode projected on the projection surface is represented by coordinates as: [6,7], [6,12], [12,7] and [12,12], the region of the liquid crystal dimming film corresponding to the above coordinates is in a transparent state, and the scanning device forms a modulating structure. The interval of the one-dimensional modulation structure along the first direction of the scanning device is the width between 6 transparent electrodes on the surface of the modulation structure, the interval of the one-dimensional modulation structure along the second direction is the width between 5 transparent electrodes, when the laser passes through the scanning device, the azimuth angle of the emergent light appearing in the first direction is arcsin (lambda/6) due to the diffraction effect of the modulation structure, and the azimuth angle of the emergent light appearing in the second direction is arcsin (lambda/5).
In summary, the phased array laser scanning device and the control method thereof provided by the invention comprise: a first transparent conductive film, a liquid crystal dimming film, a second transparent conductive film, and a power supply control unit; the liquid crystal dimming film is positioned between the first transparent conductive film and the second transparent conductive film; at least two first electrodes which are arranged in parallel along a first direction are arranged in the first transparent conductive film and are used for carrying out azimuth angle treatment on incident light in cooperation with the liquid crystal dimming film and the second transparent conductive film; at least two second electrodes which are arranged in parallel along a second direction are arranged in the second transparent conductive film and are used for emitting emergent light subjected to azimuth angle treatment, and a non-obtuse included angle between the first direction and the second direction is a preset angle; the power supply control unit is respectively connected with the first electrode and the second electrode and is used for: determining a target area on the liquid crystal dimming film according to a target interval of the phased array laser scanning device; determining a first target electrode to be electrified in the first electrode and a second target electrode to be electrified in the second electrode according to the target area; the first target electrode and the second target electrode are respectively electrified so that the target area presents a transparent state. The position of the transparent state area on the scanning device can be adjusted and different intervals can be formed by electrifying the transparent electrodes which are parallelly staggered on the two sides of the liquid crystal dimming film, the emergent angle of emergent light emitted by incident light after passing through the scanning device is controlled, the flexibility and accuracy of angle control are improved, and the power consumption and the preparation cost of the scanning device are reduced.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (7)
1. A phased array laser scanning apparatus, the phased array laser scanning apparatus comprising: a first transparent conductive film, a liquid crystal dimming film, a second transparent conductive film, and a power supply control unit;
the liquid crystal dimming film is positioned between the first transparent conductive film and the second transparent conductive film;
at least two first electrodes which are arranged in parallel along a first direction are arranged in the first transparent conductive film and are used for carrying out azimuth angle treatment on incident light in cooperation with the liquid crystal dimming film and the second transparent conductive film;
at least two second electrodes which are arranged in parallel along a second direction are arranged in the second transparent conductive film and are used for emitting emergent light subjected to azimuth angle treatment, and a non-obtuse included angle between the first direction and the second direction is a preset angle;
the power supply control unit is respectively connected with the first electrode and the second electrode and is used for:
determining a target area on the liquid crystal dimming film according to a target interval of the phased array laser scanning device;
determining a first target electrode to be electrified in the first electrode and a second target electrode to be electrified in the second electrode according to the target area;
energizing the first target electrode and the second target electrode respectively to enable the target area to be in a transparent state;
the determining the target area on the liquid crystal dimming film according to the target interval of the phased array laser scanning device comprises the following steps: determining a target interval of the scanning device according to the wavelength of the incident light and a target exit angle; determining a target area on the liquid crystal dimming film according to the corresponding relation between a preset interval and the area on the liquid crystal dimming film;
the target exit angle includes a first target exit angle and a second target exit angle, and the target interval includes a first target interval and a second target interval; the determining the target interval of the scanning device according to the wavelength of the incident light and the target exit angle comprises the following steps: determining the first target interval according to the wavelength of the incident light and the first target exit angle; and determining the second target interval according to the wavelength of the incident light and the second target exit angle.
2. The phased array laser scanning device of claim 1, wherein the first electrode and the second electrode are stripe-shaped electrodes.
3. The phased array laser scanning device of claim 2, wherein the stripe-shaped electrode has a width between 0.01um and 100 um; the interval between each strip electrode in the first transparent conductive film and the second transparent conductive film is between 0.01um and 100 um.
4. The phased array laser scanning device of claim 1, wherein the material of the first electrode and the second electrode is a transparent conductive material.
5. The phased array laser scanning apparatus of claim 1, wherein the scanning apparatus further comprises: a first substrate and a second substrate;
the first transparent conductive film is positioned between the first substrate and the liquid crystal dimming film;
the second transparent conductive film is located between the second substrate and the liquid crystal dimming film.
6. The phased array laser scanning device of claim 1, wherein the material of the liquid crystal dimming film is a polymer dispersed liquid crystal.
7. The phased array laser scanning apparatus of claim 1, wherein the determining a first target electrode to be energized of the first electrodes and a second target electrode to be energized of the second electrodes according to the target area comprises:
determining the first target electrode according to the projection area of the target area on the first electrode;
and determining the second target electrode according to the projection area of the target area on the second electrode.
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