CN113671768A - 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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- CN113671768A CN113671768A CN202010408200.6A CN202010408200A CN113671768A CN 113671768 A CN113671768 A CN 113671768A CN 202010408200 A CN202010408200 A CN 202010408200A CN 113671768 A CN113671768 A CN 113671768A
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- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 109
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- 239000004983 Polymer Dispersed Liquid Crystal Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 abstract description 5
- 230000005684 electric field Effects 0.000 description 15
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- 238000001514 detection method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 3
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- 230000000694 effects Effects 0.000 description 2
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- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- -1 Polyethylene terephthalate Polymers 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
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- 239000011521 glass Substances 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
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- 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
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- 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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Abstract
The present disclosure relates to a phased array laser scanning device and a control method thereof, 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; the first/second transparent conductive film has a plurality of first/second electrodes parallel to the first/second direction; the power supply control unit is connected with the first electrode and the second electrode and used for determining a target area according to a target interval; determining a first/second target electrode to be electrified in the first/second electrodes according to the target area; the first/second target electrodes are energized to make the target area assume a transparent state. The position of the transparent state area on the scanning device can be adjusted by electrifying the transparent electrodes parallelly staggered on the two sides of the liquid crystal dimming film, different intervals are formed, the emergent 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 short, when the laser is used for detection, the detection precision and the resolution ratio are greatly improved, and the target identification 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, mapping and the like. In the laser radar technology, the accurate control of the angle change during laser scanning is of great importance for improving the detection precision. In the prior art, the angle change is controlled by adopting an optical machine scanning mode, namely, laser emitted by a laser generates diffraction after passing through an optical machine scanning device, and the diffraction angle of the laser is adjusted by adopting modes such as a rotating mirror, a swinging mirror and a vibrating mirror, so that the change of the scanning angle during laser detection is realized. However, the optical scanning device has a large volume and large mechanical inertia, and it is difficult to flexibly and accurately control the change of the scanning angle, resulting in a slow scanning speed, large power consumption of the system, and limited system performance.
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: the liquid crystal display 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;
the first transparent conductive film is provided with at least two first electrodes which are arranged in parallel along a first direction and are used for being matched with the liquid crystal dimming film and the second transparent conductive film to carry out azimuth angle processing on incident light;
at least two second electrodes which are arranged in parallel along a second direction are arranged in the second transparent conductive film and used for emitting emergent light subjected to azimuth angle processing, 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 electrodes and a second target electrode to be electrified in the second electrodes 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-shaped electrode is between 0.01um and 100 um; the interval between every strip electrode in first transparent conductive film and the second transparent conductive film is between 0.01um-100 um.
Optionally, the first electrode and the second electrode are made of 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: the liquid crystal display 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 arranged in parallel along a second direction are arranged in the second transparent conductive film, 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; 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 electrodes and a second target electrode to be electrified in the second electrodes according to the target area;
respectively electrifying the first target electrode and the second target electrode to enable the target area to be in a transparent state;
and carrying out laser scanning on emergent light emitted after the incident light passes through the first transparent conductive film, the liquid crystal dimming film and the second transparent conductive film.
Optionally, the determining a target area on the liquid crystal dimming film according to a target interval of the phased array laser scanning apparatus includes:
determining a target interval of the scanning device according to the wavelength of the incident light and a target emergence 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 emergence angle comprises:
determining the first target interval according to the wavelength of the incident light and the first target emergence angle;
and determining the second target interval according to the wavelength of the incident light and the second target emergence angle.
Optionally, the determining, according to the target area, a first target electrode to be energized in the first electrode and a second target electrode to be energized 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, wherein the phased array laser scanning apparatus includes: the liquid crystal display 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; the first transparent conductive film is provided with at least two first electrodes which are arranged in parallel along a first direction and are used for carrying out azimuth angle processing on incident light by matching with the liquid crystal dimming film and the second transparent conductive film; the second transparent conductive film is provided with at least two second electrodes which are arranged in parallel along a second direction and used for emitting emergent light subjected to azimuth angle processing, 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 the 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 electrifying the first target electrode and the second target electrode respectively to make the target area in a transparent state. The position of the transparent state area on the scanning device can be adjusted by electrifying the transparent electrodes parallelly staggered on the two sides of the liquid crystal dimming film, different intervals are formed, the emergence angle of the emergence angle emitted after the incident light passes 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 disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a schematic diagram illustrating the structure 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 in accordance with an exemplary embodiment;
FIG. 3 is a flow chart of a powered electrode determination method according to that shown in FIG. 2;
FIG. 4 is a schematic diagram illustrating a method of controlling a phased array laser scanning apparatus in accordance with an exemplary embodiment;
fig. 5 is a schematic diagram illustrating another method of controlling a phased array laser scanning apparatus according to an exemplary embodiment.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a schematic structural diagram illustrating 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 dimming 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; the first transparent conductive film 101 is provided with at least two first electrodes 105 arranged in parallel along a first direction, and is used for performing azimuth angle processing of incident light in cooperation with the liquid crystal dimming 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 used for emitting emergent light processed by azimuth angle, and a non-obtuse included angle between the first direction and the second direction is a preset angle; the power supply control unit 104 is respectively connected to the first electrode 105 and the second electrode 106, and is configured to: 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; and electrifying the first target electrode and the second target electrode respectively to make the target area in a transparent state.
The first electrode 105 and the second electrode 106 are strip-shaped electrodes, the width of each strip-shaped electrode is between 0.01um and 100um, and the interval between the first electrode 105 and the second electrode 106 of each strip-shaped electrode in the first conductive film 101 and the second transparent conductive film 103 is also between 0.01um and 100 um. The first electrode 105 and the second electrode 106 may be made of nano silver wires, nano Indium Tin Oxide (ITO), or other transparent conductive materials.
Illustratively, the liquid crystal dimming film 102 is in an opaque state without an electric field, and when an electric field passes through the liquid crystal dimming film, liquid crystal molecules in the liquid crystal dimming film 102 are orderly arranged under the electric field, so that the liquid crystal dimming film 102 is in a transparent state. In the embodiment of the present disclosure, a first transparent conductive film 101 including a plurality of first electrodes 105 and a 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 lead and is respectively connected to the power supply control unit 104, the power supply control unit 104 selects a first target electrode among the first electrodes 105 to be electrified, and selects a second target electrode among the second electrodes 106 to be electrified, and an electric field is formed between the electrified first target electrode and the electrified second target electrode, so that an area (i.e., a target area) through which the electric field passes in the liquid crystal dimming film 102 is in a transparent state. By applying current to the first target electrode and the second target at different positions, the position of the region in the transparent state on the liquid crystal dimming film 102 can be adjusted, and the phased array laser scanning apparatus 100 can have a modulation structure with different intervals. Laser light (i.e., incident light) emitted by a laser device passes through the phased array laser scanning apparatus 100 to form a plurality of spots on a diffraction screen. It will be appreciated that the regions of transparent state and regions of opaque state alternate on the modulating structure, the spacing being used to indicate the distance between regions of transparent state aligned parallel in a first direction and/or the distance between regions of transparent state aligned parallel in a second direction.
The Liquid Crystal dimming film 102 is made of Polymer Dispersed Liquid Crystal (PDLC), which is a material obtained by mixing low molecular Liquid Crystal with a prepolymer adhesive, performing a polymerization reaction under a certain condition to form micron-sized Liquid Crystal droplets, uniformly dispersing the micron-sized Liquid Crystal droplets in a Polymer network, and then utilizing dielectric anisotropy of Liquid Crystal molecules to obtain a material with an electro-optic response characteristic. The PDLC has an advantage of a fast response speed, and when the first target electrode and the second target electrode are energized, the surface of the liquid crystal dimming film 102 can be switched between a region in a transparent state and a region in an opaque state. 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 of the above electrodes), and adjusting the first target electrode and the second target electrode that are energized, it is possible to achieve continuous change of the interval in the two-dimensional direction, thereby controlling continuous change of the outgoing light angle.
In addition, as shown in fig. 1, the non-obtuse included angle (i.e., the predetermined 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 non-obtuse included angle, the phased array laser scanning apparatus 100 can form two-dimensional modulation structures of different structures and different intervals.
In addition, the scanning apparatus 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 (PET), glass or other transparent materials, and are respectively attached to the first transparent conductive film 101 and the second transparent conductive film 103 to perform protection and isolation functions.
In summary, the phased array laser scanning apparatus provided by the present invention includes: the liquid crystal display 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; the first transparent conductive film is provided with at least two first electrodes which are arranged in parallel along a first direction and are used for carrying out azimuth angle processing on incident light by matching with the liquid crystal dimming film and the second transparent conductive film; the second transparent conductive film is provided with at least two second electrodes which are arranged in parallel along a second direction and used for emitting emergent light subjected to azimuth angle processing, 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 the 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 electrifying the first target electrode and the second target electrode respectively to make the target area in a transparent state. The position of the transparent state area on the scanning device can be adjusted by electrifying the transparent electrodes parallelly staggered on the two sides of the liquid crystal dimming film, different intervals are formed, the emergent angle of emergent light emitted after incident light passes 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: the liquid crystal display 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 arranged in parallel along a second direction are arranged in the second transparent conductive film, 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; the method comprises the following steps:
in step 201, incident light emitted by a laser is received.
Illustratively, in the lidar technology using laser for detection, a laser transmitter emits incident light, the azimuth angle of which changes after passing through a phased array laser scanning device in the embodiment of the present disclosure, so as to influence the angle of an emergent angle, and the angle of the emergent light is controlled through the following steps 202 to 204, so that the laser scans a detected object within a certain angle range.
In step 202, a target area on the liquid crystal dimming film is determined based on the target interval of the phased array laser scanner.
For example, when an electric field is applied, a partial region of the liquid crystal dimming film (i.e., a region through which the electric field passes) is transparent, and the region of the liquid crystal dimming film (i.e., a region through which the electric field passes) is adjusted to provide a modulation structure in which a region in a transparent state and a region in an opaque state are alternately arranged. Therefore, by performing a plurality of sets of values for the regions in the transparent state and the intervals corresponding to the regions, and by performing function fitting on the numerical values of the regions and the intervals corresponding to the regions in each set, the correspondence relationship between the intervals and the regions on the liquid crystal dimming film can be obtained. According to the correspondence, 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 by determining one target interval.
Specifically, determining a target area on the liquid crystal dimming film according to a target interval of the phased array laser scanning apparatus includes: determining a target interval of the scanning device according to the wavelength of the incident light and a target emergence 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 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 spacing.
When the wavelength of the incident light is λ, the emission angle θ depends on the interval d of the scanning device, and therefore, in order to make the numerical value of the azimuth angle of the emission light emitted after the incident light passes through the phased array laser scanning device (i.e., the emission angle θ) a target emission angle, it is necessary to make the interval of the phased array laser scanning device a target interval corresponding to the target emission angle, that is, to adjust the region in which the liquid crystal light adjusting film is in a transparent state to 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 comprises a first target exit angle and a second target exit angle, and the target interval comprises 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 a target exit angle, comprising: determining the first target interval according to the wavelength of the incident light and the first target emergence 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.
Illustratively, according to the structural characteristics of the liquid crystal light adjusting film (i.e. the region through which the electric field passes has a transparent state), after the target region is determined, a first target electrode is further determined in the first electrode, and a second target electrode is further determined in the second electrode, and the first target electrode and the second target electrode need to satisfy the following conditions: 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 respectively energized to make the target area in a transparent state.
Illustratively, the first target electrode and the second target electrode are respectively electrified (normally, live line electricity and zero line electricity are respectively provided), an electric field is formed between a projection area of a target area on the first target electrode and a projection area of the target area on the second target electrode, and the target area on the liquid crystal dimming film is in a transparent state.
In step 205, laser scanning is performed according to the emergent light emitted after the incident light passes through the first transparent conductive film, the liquid crystal dimming film and the second transparent conductive film.
For example, after the interval of the phased array laser scanning apparatus is adjusted through the above steps 202 to 204, it is equivalent to adjust the azimuth angle of the outgoing light after the incident light passes through the modulation structure, 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 light modulation film and the second transparent conductive film is the target outgoing angle. Through the emergent light, the detected object can be subjected to laser scanning, so that the azimuth angle of the emergent 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 continuously changed along with the change of the target interval, and the detected object can be continuously scanned within a certain angle range.
FIG. 3 is a flow chart of a powered electrode determining method according to FIG. 2, as shown in FIG. 3, the step 203 comprising:
in step 2031, the first target electrode is determined according to the projected area of the target area on the first electrode.
In step 2032, the second target electrode is determined based on the projected area of the target area onto the second electrode.
Illustratively, the first electrode and the second electrode are respectively positioned in the first transparent conductive film and the second transparent conductive film, and 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 of the first electrode completely or partially covered by the projection of the target area 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 of the second electrode completely or partially covered by the projection of the target area is the second target electrode).
In summary, the control method of the phased array laser scanning apparatus provided by the present invention is applied to a phased array laser scanning apparatus, and the phased array laser scanning apparatus includes: the liquid crystal display 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 arranged in parallel along a second direction are arranged in the second transparent conductive film, 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 the control method comprises the following steps: determining a target area on the liquid crystal dimming film according to the 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 electrifying the first target electrode and the second target electrode respectively to make the target area in a transparent state. The position of the transparent state area on the scanning device can be adjusted by electrifying the transparent electrodes parallelly staggered on the two sides of the liquid crystal dimming film, different intervals are formed, the emergent angle of emergent light emitted after incident light passes 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 illustrating a control method of a phased array laser scanning apparatus according to an exemplary embodiment, where a projection plane of the phased array laser scanning apparatus is taken in a direction perpendicular to a plane in which the first transparent conductive film is located, as shown in fig. 4. Wherein, the projection of the first electrode in the first transparent conductive film on the projection surface is shown by a solid line, and the first electrodes are arranged in parallel along a first direction; and the projection of the second electrode in the second transparent conductive film on the projection surface is indicated by a dotted line, and the second electrodes are arranged in parallel along the second direction. Each of the first electrodes and the second electrodes is distinguished by a serial number, and a position where an overlapping portion of projections of the first electrode and the second electrode on the projection plane is located is represented in the form of coordinates, for example, an overlapping portion of projections of a 4 th first electrode and a 3 rd second electrode on the projection plane is represented as [4,3 ].
Energizing the 4 th, 8 th, 12 th and 16 th first electrodes and energizing the 3 rd, 7 th, 11 th and 15 th second electrodes by the power supply control unit, wherein an electric field is formed between each energized first electrode and each energized second electrode, and the region of the liquid crystal dimming film through which the electric field passes is in a transparent state. The projection part of each electrified first electrode and each electrified second electrode on the projection plane is represented by coordinates as follows: [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], wherein a region corresponding to the coordinates on the liquid crystal light modulation film is transparent, and the scanning device forms a modulation structure. The interval of the one-dimensional modulation structures of the scanning device along the first direction is the width between the 4 transparent electrodes on the surface of the modulation structure, the interval of the one-dimensional modulation structures along the second direction is the width between the 4 transparent electrodes on the surface of the modulation structure, when laser passes through the scanning device, due to the diffraction effect of the modulation structure, the azimuth angle of emergent light appearing in the first direction is arcsin (lambda/4), and the azimuth angle of emergent light appearing in the second direction is arcsin (lambda/4).
Fig. 5 is a schematic diagram illustrating another control method of a phased array laser scanning apparatus according to an exemplary embodiment, in which a projection plane of the scanning apparatus is taken in a direction perpendicular to a plane in which the first transparent conductive film is located, as shown in fig. 5. Wherein, the projection of the first electrode in the first transparent conductive film on the projection surface is shown by a solid line, and the first electrodes are arranged in parallel along a first direction; and the projection of the second electrode in the second transparent conductive film on the projection surface is indicated by a dotted line, and the second electrodes are arranged in parallel along the second direction. Each of the first electrodes and the second electrodes is distinguished by a serial number, and a position where an overlapping portion of projections of the first electrode and the second electrode on the projection surface is located is represented in the form of coordinates, for example, an overlapping portion of projections of a 6 th first electrode and a 7 th second electrode on the projection surface is represented as [6,7 ].
And electrifying the 6 th and 12 th first electrodes and electrifying the 7 th and 12 th second electrodes through the power supply control unit, wherein an electric field is formed between each electrified first electrode and each electrified second electrode, and the region of the liquid crystal dimming film, through which the electric field passes, is in a transparent state. The projection part of each electrified first electrode and each electrified second electrode on the projection plane is represented by coordinates as follows: [6,7], [6,12], [12,7] and [12,12], the region corresponding to the above-mentioned coordinate on the liquid crystal dimming film appears transparent, and the scanning device forms a modulation structure. The interval of the one-dimensional modulation structures of the scanning device along the first direction is the width between 6 transparent electrodes on the surface of the modulation structure, the interval of the one-dimensional modulation structures along the second direction is the width between 5 transparent electrodes, when laser passes through the scanning device, due to the diffraction effect of the modulation structures, the azimuth angle of emergent light appearing in the first direction is arcsin (lambda/6), and the azimuth angle of emergent light appearing in the second direction is arcsin (lambda/5).
In summary, the phased array laser scanning apparatus and the control method thereof provided by the present invention include: the liquid crystal display 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; the first transparent conductive film is provided with at least two first electrodes which are arranged in parallel along a first direction and are used for carrying out azimuth angle processing on incident light by matching with the liquid crystal dimming film and the second transparent conductive film; the second transparent conductive film is provided with at least two second electrodes which are arranged in parallel along a second direction and used for emitting emergent light subjected to azimuth angle processing, 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 the 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 electrifying the first target electrode and the second target electrode respectively to make the target area in a transparent state. The position of the transparent state area on the scanning device can be adjusted by electrifying the transparent electrodes parallelly staggered on the two sides of the liquid crystal dimming film, different intervals are formed, the emergent angle of emergent light emitted after incident light passes 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 are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A phased array laser scanning apparatus, characterized in that the phased array laser scanning apparatus comprises: the liquid crystal display 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;
the first transparent conductive film is provided with at least two first electrodes which are arranged in parallel along a first direction and are used for being matched with the liquid crystal dimming film and the second transparent conductive film to carry out azimuth angle processing on incident light;
at least two second electrodes which are arranged in parallel along a second direction are arranged in the second transparent conductive film and used for emitting emergent light subjected to azimuth angle processing, 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 electrodes and a second target electrode to be electrified in the second electrodes 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.
2. The phased array laser scanning apparatus according to claim 1, wherein said first and second electrodes are strip electrodes.
3. The phased array laser scanning apparatus according to claim 2, wherein the width of the strip electrodes is between 0.01um-100 um; the interval between every strip electrode in first transparent conductive film and the second transparent conductive film is between 0.01um-100 um.
4. The phased array laser scanning apparatus according to claim 1, wherein the material of said first and second electrodes 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 scanner of claim 1, wherein said liquid crystal dimming film is made of polymer dispersed liquid crystal.
7. A control method of a phased array laser scanning device is characterized by being applied to the phased array laser scanning device, and the phased array laser scanning device comprises the following steps: the liquid crystal display 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 arranged in parallel along a second direction are arranged in the second transparent conductive film, 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; 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 electrodes and a second target electrode to be electrified in the second electrodes according to the target area;
respectively electrifying the first target electrode and the second target electrode to enable the target area to be in a transparent state;
and carrying out laser scanning on emergent light emitted after the incident light passes through the first transparent conductive film, the liquid crystal dimming film and the second transparent conductive film.
8. The method of claim 7, wherein said determining a target area on said liquid crystal dimming film based on a target spacing of said phased array laser scanning device comprises:
determining a target interval of the scanning device according to the wavelength of the incident light and a target emergence 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.
9. The method of controlling a phased array laser scanning apparatus according to claim 8, wherein the target exit angle comprises a first target exit angle and a second target exit angle, and the target interval comprises 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 emergence angle comprises:
determining the first target interval according to the wavelength of the incident light and the first target emergence angle;
and determining the second target interval according to the wavelength of the incident light and the second target emergence angle.
10. The method of controlling a phased array laser scanning apparatus according to claim 7, wherein said determining a first target electrode to be energized in said first electrodes and a second target electrode to be energized in said second electrodes according to said 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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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0352302A1 (en) * | 1987-08-19 | 1990-01-31 | Hughes Aircraft Company | Phase controlled light deflector |
| US5253033A (en) * | 1990-12-03 | 1993-10-12 | Raytheon Company | Laser radar system with phased-array beam steerer |
| CN102314028A (en) * | 2010-07-09 | 2012-01-11 | 索尼公司 | Lens array unit and image display device |
| CN103916183A (en) * | 2014-04-16 | 2014-07-09 | 电子科技大学 | Fast acquisition system and method based on laser phased technology |
| CN104536133A (en) * | 2014-12-26 | 2015-04-22 | 南京中科神光科技有限公司 | Laser scanning projecting device |
| CN109116597A (en) * | 2018-09-21 | 2019-01-01 | 深圳市速腾聚创科技有限公司 | liquid crystal optical waveguide and laser radar |
| WO2019229051A1 (en) * | 2018-05-29 | 2019-12-05 | Seereal Technologies S.A. | Diffractive optical element and display device |
-
2020
- 2020-05-14 CN CN202010408200.6A patent/CN113671768B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0352302A1 (en) * | 1987-08-19 | 1990-01-31 | Hughes Aircraft Company | Phase controlled light deflector |
| US5253033A (en) * | 1990-12-03 | 1993-10-12 | Raytheon Company | Laser radar system with phased-array beam steerer |
| CN102314028A (en) * | 2010-07-09 | 2012-01-11 | 索尼公司 | Lens array unit and image display device |
| CN103916183A (en) * | 2014-04-16 | 2014-07-09 | 电子科技大学 | Fast acquisition system and method based on laser phased technology |
| CN104536133A (en) * | 2014-12-26 | 2015-04-22 | 南京中科神光科技有限公司 | Laser scanning projecting device |
| WO2019229051A1 (en) * | 2018-05-29 | 2019-12-05 | Seereal Technologies S.A. | Diffractive optical element and display device |
| CN109116597A (en) * | 2018-09-21 | 2019-01-01 | 深圳市速腾聚创科技有限公司 | liquid crystal optical waveguide and laser radar |
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