CN106168727B - Liquid crystal lens array, imaging device and method - Google Patents
Liquid crystal lens array, imaging device and method Download PDFInfo
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- CN106168727B CN106168727B CN201610755321.1A CN201610755321A CN106168727B CN 106168727 B CN106168727 B CN 106168727B CN 201610755321 A CN201610755321 A CN 201610755321A CN 106168727 B CN106168727 B CN 106168727B
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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
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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
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
Abstract
The invention discloses a liquid crystal lens array, an imaging device and a method. The liquid crystal lens array includes: the liquid crystal display device comprises a plurality of liquid crystal lenses distributed in an array and a lens array driving unit, wherein the lens array driving unit drives each liquid crystal lens to switch between a lens state and a non-lens state, and in one driving period, at the moment T1, a first liquid crystal lens in any two adjacent liquid crystal lenses with the nearest interval is in the lens state, and a second liquid crystal lens is in the non-lens state; at time T2, the first liquid crystal lens is in a non-lens state and the second liquid crystal lens is in a lens state. The invention also discloses an imaging device and an imaging method based on the liquid crystal lens array. The invention can improve the aperture opening ratio of the liquid crystal lens array, physically realize the overlapping of lens imaging, facilitate the design of an optical system, simplify the image splicing processing difficulty, improve the image resolution of an imaging system and obtain better imaging quality.
Description
Technical Field
The invention relates to the technical field of liquid crystal lenses, in particular to a liquid crystal lens array, an imaging device with the liquid crystal lens array and an imaging method.
Background
The liquid crystal lens array device has the advantages of small volume, light weight, low power consumption and the like, and has unique advantages because the liquid crystal lens array device does not need mechanical parts to realize adjustable focal length. Through recent development, the liquid crystal lens and the array thereof have great potential application value in various fields such as optical communication devices, optical fiber switches, optical deflection devices, 3D display, integrated image systems, image processing and the like.
In the prior art, when imaging with a liquid crystal lens array, in order to obtain a high-quality image, it is necessary to increase the Aperture ratio (Aperture) of the liquid crystal lens array, which makes it necessary to minimize the pitch between the liquid crystal lenses. Experimental research shows that when the distance between two adjacent liquid crystal lenses is smaller in the liquid crystal lens array, the interference between the two adjacent liquid crystal lenses closest to each other is easily caused by adopting the driving mode of the existing liquid crystal lens array, and the imaging quality is influenced when the interference is applied to the technical fields of imaging and the like.
Disclosure of Invention
The invention provides a liquid crystal lens array, an imaging device and an imaging method, which are used for solving the technical problem that interference is generated between adjacent liquid crystal lenses in the liquid crystal lens array in the prior art for improving the aperture opening ratio.
In order to achieve the above object, the present invention provides a liquid crystal lens array comprising: the liquid crystal display device comprises a plurality of liquid crystal lenses distributed in an array and a lens array driving unit, wherein the lens array driving unit drives each liquid crystal lens to switch between a lens state and a non-lens state, and in one driving period, at the moment T1, a first liquid crystal lens in any two adjacent liquid crystal lenses with the nearest interval is in the lens state, and a second liquid crystal lens is in the non-lens state; at time T2, the first liquid crystal lens is in a non-lens state, and the second liquid crystal lens is in a lens state.
Preferably, the lens array driving unit includes:
the micro control circuit is used for controlling the lens array driving unit to work;
a signal generating circuit for generating an initial driving signal for driving the liquid crystal lens;
the address decoder is used for receiving a signal for inquiring the address of the liquid crystal lens to be driven, which is output by the micro control circuit, and outputting address information of the liquid crystal lens to be driven;
and the signal amplitude modulation circuit is used for carrying out amplitude modulation on the initial driving signal according to the control signal of the liquid crystal lens to be driven output by the micro control circuit and the address information sent by the address decoder and then outputting a driving signal to drive the liquid crystal lens to be driven corresponding to the address information.
Preferably, the lens array driving unit includes: and the signal correction circuit is used for removing the direct current component of the initial driving signal generated by the signal generation circuit and outputting the initial driving signal to the signal amplitude modulation circuit.
Preferably, the signal amplitude modulation circuit includes: each signal amplitude modulation module corresponds to one liquid crystal lens, and each signal amplitude modulation module outputs a first driving voltage and a second driving voltage different from the first driving voltage to drive the corresponding liquid crystal lens.
Preferably, the address decoder and the micro control circuit output signals to the signal amplitude modulation circuit through a TFT array or an FPGA array.
Preferably, the micro control circuit includes a data driver for outputting a control signal, the address decoder and the data driver output signals to the signal amplitude modulation circuit through the TFT array, wherein the data driver outputs the control signal through a plurality of data lines, the address decoder outputs address information through a plurality of address lines, the TFT array includes a plurality of thin film transistors, each of which includes a source electrode connected to a data line, a gate electrode connected to an address line, and a drain electrode connected to the signal amplitude modulation circuit.
Preferably, the liquid crystal lens includes: each liquid crystal lens comprises a first substrate, a second substrate, a first electrode, a second electrode and a third electrode, wherein the first electrode and the second electrode are arranged on the first substrate, the third electrode is arranged on the second substrate, the liquid crystal layer is arranged between the second electrode and the third electrode, the first electrode and the second electrode are insulated from each other, at least a part of the first electrode and the second electrode are not overlapped, the first electrode and the second electrode are driving electrodes, and the third electrode is a common electrode.
Preferably, the second electrode is circular or regular hexagonal.
The invention also provides an imaging device for shooting a scene to form a scene image, comprising: a main lens unit, an image sensor, an image processing controller, and a memory. The imaging device further includes: the liquid crystal lens array is arranged between the main lens unit and the image sensor, and the image processing controller calls the program instructions stored in the memory to control the image sensor and the liquid crystal lens array to work, wherein the liquid crystal lens array is the liquid crystal lens array as described above.
The invention also provides an imaging method for shooting a scene to form a scene image, comprising the following steps: s10, providing a liquid crystal lens array, comprising: a plurality of liquid crystal lenses distributed in an array, and a lens array driving unit that drives each liquid crystal lens to switch between a lens state and a non-lens state; s20, in a driving period, at the time T1, driving a first liquid crystal lens in any two adjacent liquid crystal lenses with the nearest distance to each other to be in a lens state, and driving a second liquid crystal lens in a non-lens state; s30, driving the first liquid crystal lens to be in a non-lens state and driving the second liquid crystal lens to be in a lens state at the time T2; s40, synthesizing the scene image according to the first image of the first liquid crystal lens in the lens state at the moment T1 and the second image of the second liquid crystal lens in the lens state at the moment T2.
According to the liquid crystal lens array, the imaging device and the method, any two liquid crystal lenses closest to each other are respectively in the lens state and the non-lens state at the same time, so that the aperture ratio of the liquid crystal lens array can be greatly improved without interference, and the overlapping of lens imaging is physically realized.
Drawings
Fig. 1 is a schematic circuit diagram of a liquid crystal lens array according to a preferred embodiment of the invention.
FIG. 2 is a schematic diagram showing an embodiment of the micro-control circuit and the address decoder of FIG. 1 connected to a signal amplitude modulation circuit through a TFT array.
Fig. 3a is a schematic structural diagram of an embodiment of the liquid crystal lens in fig. 1.
Fig. 3b is a schematic structural diagram of another embodiment of the liquid crystal lens in fig. 1.
Fig. 4a is a schematic diagram illustrating an arrangement of the second electrode of the liquid crystal lens in fig. 3 a.
Fig. 4b is a schematic layout diagram of another embodiment of the second electrode of the liquid crystal lens in fig. 3 a.
Fig. 5 is a schematic structural view of an image forming apparatus according to a preferred embodiment of the present invention.
Fig. 6 is a flow chart of an imaging method according to a preferred embodiment of the invention.
Detailed Description
The invention will now be described in detail with reference to the drawings and examples. It should be noted that, if not conflicting, the embodiments of the present invention and the features of the embodiments may be combined with each other, which are all within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic circuit diagram of a liquid crystal lens array according to a preferred embodiment of the invention. As shown in fig. 1, the present invention provides a liquid crystal lens array, comprising: a plurality of liquid crystal lenses 410, 420, 430 distributed in an array, and a lens array driving unit 200. The lens array driving unit 200 drives each of the liquid crystal lenses 410, 420, 430 to switch between a lens state and a non-lens state. In one driving period, at time T1, a first liquid crystal lens 410 of any two adjacent liquid crystal lenses 410 and 420 with the closest spacing distance is in a lens state, and a second liquid crystal lens 420 is in a non-lens state; at time T2, the first lc lens 410 is in a non-lens state and the second lc lens 420 is in a lens state. During the above-described driving period, all of the lc lenses 410, 420, 430 in the lc lens array are in the lens state at once. The lens state refers to that the refractive index distribution of the liquid crystal lenses 410, 420 and 430 is arranged in a certain regular gradient, the lens effect is the same as that of a glass lens, the refractive index of liquid crystal molecules in the liquid crystal box is arranged in a gradient manner by applying voltage, the convex lens effect or the concave lens effect is shown, and the focal length can be adjusted by changing the driving voltage; the non-lens state means that the liquid crystal lenses 410, 420, 430 are not applied with voltage or are applied with voltage, but the refractive index is uniformly distributed in the plane perpendicular to the optical axis at this time, and no refraction effect is generated on the light. The liquid crystal lens array of the present invention can thus realize the effect of a convex lens (positive lens), a concave lens (negative lens) or a parallel glass plate having no refraction to light rays by varying the driving voltage amplitude of the lens array driving unit 200. The size of the liquid crystal lenses in the liquid crystal lens array is not limited, and may be several millimeters to several tens of millimeters, or may be smaller or larger, and a plurality of liquid crystal lenses may be arranged in an array.
According to the liquid crystal lens array, any two liquid crystal lenses closest to each other are respectively in the lens state and the non-lens state at the same time, the two liquid crystal lenses closest to each other are driven in the lens state in a time-sharing mode, the lens area of the lens state is larger than the electrode area of the lens state during driving, so that the lens areas of the two liquid crystal lenses closest to each other are partially overlapped, the total aperture ratio of the liquid crystal lens array is larger than that of a glass lens array with the same aperture, the aperture ratio of the liquid crystal lens array can be greatly improved without interference, overlapping of lens imaging is physically realized, greater flexibility is provided for the design of an optical system, and the volume of the optical system is smaller.
In one embodiment, the lens array driving unit 200 specifically includes:
a micro control circuit 250 for controlling the operation of the lens array driving unit 200; the micro control circuit 250 may be an MCU (micro control unit) or FPGA (programmable logic control array) circuit or a DSP (digital signal processor) circuit. The micro control circuit 250 is a control and data processing part of the entire lens array driving unit 200, and can perform individual control processing for each main circuit part of the lens array unit 200.
A signal generating circuit 210 for generating an initial driving signal for driving the liquid crystal lens; the signal generating circuit 210 typically generates a square wave or sine wave, but other waveforms are possible. If the square wave or the like cannot be directly used for driving the liquid crystal lens, a digital-to-analog conversion module is further disposed in the signal generating circuit 210 to convert the digital square wave signal into an analog signal capable of driving the liquid crystal lens to work.
The address decoder 240 is configured to receive a signal for querying an address of the liquid crystal lens to be driven, which is output by the micro control circuit, and output address information of the liquid crystal lens to be driven. The address decoder 20 encodes each liquid crystal lens so as to accurately find the liquid crystal lens to be driven and then control the corresponding state thereof when driving the liquid crystal lens array.
The signal amplitude modulation circuit 230 modulates the amplitude of the initial driving signal according to the control signal of the liquid crystal lens to be driven and the address information sent by the address decoder and outputs a driving signal to drive the liquid crystal lens to be driven corresponding to the address information. The signal amplitude modulation is mainly used for modulating the initial driving signal according to the control signal so as to meet the driving voltage requirement of driving the liquid crystal lens.
In a preferred embodiment, the lens array driving unit further includes: a signal correction circuit 220 for removing a direct current component from the initial driving signal generated by the signal generation circuit 210 and outputting the removed direct current component to the signal amplitude modulation circuit 230. Since the signal generated by the signal generating circuit 210 may contain a dc signal, the dc signal may affect the driving voltage of the liquid crystal lens, and thus affect the lens effect of the liquid crystal lens, and thus needs to be removed.
In one embodiment, the signal amplitude modulation circuit 230 includes: each signal amplitude modulation module corresponds to one liquid crystal lens, and each signal amplitude modulation module outputs a first driving voltage V1 and a second driving voltage V2 to drive the corresponding liquid crystal lens. The magnitudes and frequencies of the first driving voltage V1 and the second driving voltage V2 may be changed so as to form a predetermined liquid crystal lens effect or not. In addition, the signal amplitude modulation circuit 230 may be an application specific integrated chip, and the corresponding liquid crystal lens is controlled by each pin output.
In a variant embodiment, the address decoder 240 and the micro control circuit 250 output signals to the signal amplitude modulation circuit 230 through a TFT array or an FPGA array, the output signals being enable signals for enabling control of a specific liquid crystal lens. Specifically, referring to fig. 2, fig. 2 is a schematic diagram showing a specific structure of one embodiment of the micro control circuit 250 and the address decoder 240 in fig. 1, which are connected to the signal amplitude modulation circuit 230 through a TFT array. As shown in fig. 2, the micro-control circuit 250 includes a data driver 251 for outputting a control signal, the address decoder 240 and the data driver 251 output signals to the signal amplitude modulation circuit 230 through the TFT array, wherein the data driver 251 outputs a control signal through a plurality of data lines 252, 253, the address decoder 240 outputs address information through a plurality of address lines 241, 242, the TFT array includes a plurality of thin film transistors 243, each of the thin film transistors 243 includes a source electrode 243b, a gate electrode 243a and a drain electrode 243c, the source electrode 243b is connected to one of the data lines 252 or 253, the gate electrode 243a is connected to one of the address lines 241 or 242, and the drain electrode 243c is connected to the signal amplitude modulation circuit 230.
In one embodiment, each lc lens 410, 420, 430 includes: the liquid crystal display comprises a first substrate, a second substrate, a first electrode, a second electrode and a third electrode, wherein the first electrode, the second electrode and the third electrode are arranged on the first substrate, the liquid crystal layer is arranged between the second electrode and the third electrode, the first electrode and the second electrode are insulated from each other and at least partially are not overlapped, the first electrode and the second electrode are driving electrodes, the third electrode is a common electrode, and the first electrode, the second electrode and the third electrode are all transparent electrodes, such as ITO (indium tin oxide film). Referring to fig. 3a and fig. 3b, fig. 3a is a schematic structural diagram of an embodiment of the liquid crystal lens in fig. 1, and fig. 3b is a schematic structural diagram of another embodiment of the liquid crystal lens in fig. 1. As shown in fig. 3a, the liquid crystal lens 100 includes a first substrate 110, a second substrate 190, and a liquid crystal layer 170 disposed between the first substrate 110 and the second substrate 190, wherein an electrode layer, a first insulating layer 130, a weak conductive film 160, and a first alignment film layer 150a are sequentially disposed on a surface of the first substrate 110 facing the liquid crystal layer 170, the electrode layer includes a first electrode 120 and a second electrode 140, the first electrode 120 is in a circular hole shape, and the second electrode 140 is disposed in the circular hole of the first electrode 120 and is in a circular shape or a regular hexagon shape. The surface of the second substrate 190 is sequentially provided with a third electrode 180 and a second alignment film 150b. The first alignment film layer 150a and the second alignment film layer 150b respectively provide an initial alignment to the liquid crystal molecules of the liquid crystal layer 170 so that the liquid crystal molecules are aligned at a certain pretilt angle. In the above-mentioned liquid crystal lens structure, the third electrode is used as the common electrode 180, and the first electrode 120 and the second electrode 140 are used as driving electrodes, respectively receiving the first driving voltage V1 and the second driving voltage V2 outputted by the signal amplitude modulation module of the signal amplitude modulation circuit 230, so as to drive the liquid crystal lens to switch between the lens state and the non-lens state.
As shown in fig. 3b, another liquid crystal lens 10 of the present invention includes: the first and second substrates 11 and 19 and the liquid crystal layer 17 between the first and second substrates 11 and 19. The first substrate 11 is provided with a first electrode 12, a first insulating layer 13, a second electrode 14 and a first alignment film layer 15a on a surface of the first substrate facing the liquid crystal layer 17, wherein the second electrode 14 is in a circular hole shape, and a weak conductive film 18 is disposed in the second electrode 14, and the weak conductive film 18 is in a circular shape. The second substrate 19 is provided with a third electrode 16 and a second alignment layer 15b on a surface thereof facing the liquid crystal layer 17. The liquid crystal lens of the present embodiment is different from the liquid crystal lens of fig. 3a mainly in the difference in structure and the principle is the same.
Referring to fig. 4a and 4b, fig. 4a is a schematic diagram illustrating an arrangement of one embodiment of the second electrode of the liquid crystal lens in fig. 3a, and fig. 4b is a schematic diagram illustrating an arrangement of another embodiment of the second electrode of the liquid crystal lens in fig. 3 a. As shown in fig. 4a, the second electrodes of the plurality of liquid crystal lenses are arranged in an array form, each second electrode corresponds to one liquid crystal lens, the reference number of each second electrode is uniquely determined by a row number and a column number, for example, 101a represents a 101 th row a electrode, 6 rows of second electrodes are schematically shown by reference numbers 101, 102, 103, 104, 105 and 106, and 6 columns of second electrodes are provided in each row, each row is a, b, c, d, e and f columns. As can be seen from the figure, the second electrode adjacent to the second electrode 101a has a second electrode 101b, a second electrode 102a, and a second electrode 102b, wherein the center distances between the second electrode 101a and the second electrodes 101b and 102a are d1, and the center distances between the second electrode 101a and the second electrode 102b are d2 (d 2 > d1 > 0). That is, the distance between the liquid crystal lens corresponding to the second electrode 101a and the liquid crystal lens corresponding to the second electrode 101b and the liquid crystal lens corresponding to the second electrode 102a is shorter than the distance between the liquid crystal lens corresponding to the second electrode 101a and the liquid crystal lens corresponding to the second electrode 102 b. Therefore, at the same driving timing, the state of the liquid crystal lens corresponding to the second electrode 101a is the same as the state of the liquid crystal lens corresponding to the second electrode 102b, and the state of the liquid crystal lens corresponding to the second electrode 101a is different from the state of the liquid crystal lens corresponding to the second electrode 102a and the state of the liquid crystal lens corresponding to the second electrode 102 a. The same states here refer to both being in a lens state or a non-lens state. The difference in states here means that one is in a lens state and the other is in a non-lens state. Similarly, if the second electrode 102b is selected as the reference, the liquid crystal lenses corresponding to the second electrode 101a, the second electrode 101c, the second electrode 103a, and the second electrode 103c on the diagonal line of the second electrode 102b are the same at the same driving time, and the liquid crystal lenses corresponding to the second electrode 101b, the second electrode 102a, the second electrode 102c, and the second electrode 103b closest to the second electrode 102b are different at the same driving time.
Referring to fig. 5, fig. 5 is a schematic structural diagram of an imaging device according to a preferred embodiment of the invention. As shown in fig. 5, an imaging apparatus according to a preferred embodiment of the present invention is used for capturing a scene 41 to form a scene image, and includes:
the main lens unit 42 is used for shooting the scene 41 positioned at one side of the main lens unit 42 and imaging the scene at the other side of the main lens unit 42, and comprises a plurality of optical lenses, and the combined optical lenses can form a common shooting lens.
The image sensor 44 is configured to convert an acquired image of a scene into an electrical signal and output the electrical signal as an image signal. The image sensor 44 may be a CCD or CMOS sensor.
The memory 46 stores a program of instructions for implementing liquid crystal lens array control and image processing. These program instructions are mainly used for the imaging device to realize a variable-focus imaging function.
The image processing controller 45 is connected to the memory 46, the liquid crystal lens array 43, and the image sensor 44, and controls the operation of the entire imaging apparatus.
The imaging device further includes: the lc lens array 43, the lc lens array 43 is disposed between the main lens unit 42 and the image sensor 44, and the image processing controller 45 invokes the program instructions stored in the memory 46 to control the operation of the image sensor 44 and the lc lens array 43, wherein the lc lens array 43 is the lc lens array as described above, and the detailed description of the structure of the lc lens array is shown in fig. 1 to 5 and the related description above, which are not repeated herein.
The imaging device adopts the liquid crystal lens array, and the liquid crystal lens with any two nearest liquid crystal lenses are respectively in a lens state and a non-lens state at the same time, so that the two liquid crystal lenses with the nearest liquid crystal lenses are in the lens state in a time-sharing mode, and the lens area in the lens state is larger than the electrode area of the liquid crystal lenses during driving, so that the lens areas of the two liquid crystal lenses with the nearest liquid crystal lenses are partially overlapped, the total opening ratio of the liquid crystal lens array is larger than the total opening ratio of the glass lens array with the same aperture, the opening ratio of the liquid crystal lens array can be greatly improved without interference, and the overlapping of lens imaging is physically realized. Compared with the prior art, the method has the advantages that the problem that devices in the imaging system are set according to specified parameters is not needed to be considered, the design of the optical system is provided with greater flexibility, the volume of the optical system is smaller, the image processing algorithm is simplified, the image splicing processing difficulty is simplified because the obtained images are partially overlapped, the response speed of the imaging system is improved, the resolution of the image is improved, and better imaging quality can be obtained.
Referring to fig. 6, fig. 6 is a flow chart of an imaging method according to a preferred embodiment of the invention. As shown in fig. 6, the imaging method according to the preferred embodiment of the present invention is used for capturing a scene to form a scene image, and mainly comprises the following steps:
s10, providing a liquid crystal lens array, comprising: a plurality of liquid crystal lenses distributed in an array, and a lens array driving unit that drives each liquid crystal lens to switch between a lens state and a non-lens state; it should be noted that the lens array driving unit is controlled individually for each liquid crystal lens, or in groups, and the liquid crystal lenses of different groups are in different states at the same time, and the liquid crystal lenses of the same group are in the same state at the same time, so that the circuit structure can be simplified.
S20, in a driving period, at the time T1, driving a first liquid crystal lens in any two adjacent liquid crystal lenses with the nearest distance to each other to be in a lens state, and driving a second liquid crystal lens in a non-lens state;
s30, driving the first liquid crystal lens to be in a non-lens state and driving the second liquid crystal lens to be in a lens state at the time T2;
s40, synthesizing the scene image according to the first image of the first liquid crystal lens in the lens state at the moment T1 and the second image of the second liquid crystal lens in the lens state at the moment T2.
Further, between step S10 and step S20, further includes:
s21, address information acquisition, namely acquiring address information of each liquid crystal lens;
s22, judging the distance between the liquid crystal lenses in the liquid crystal lens array qualitatively according to the address information of each liquid crystal lens.
According to the imaging method adopting the liquid crystal lens array, any two liquid crystal lenses closest to each other are respectively in the lens state and the non-lens state at the same time, the two liquid crystal lenses closest to each other are driven in the lens state in a time-sharing mode, and the lens area in the lens state is larger than the electrode area of the liquid crystal lenses when the liquid crystal lenses are driven, so that partial overlapping exists between the lens areas of the two liquid crystal lenses closest to each other, the total opening ratio of the liquid crystal lens array is larger than that of the glass lens array with the same aperture, the opening ratio of the liquid crystal lens array can be greatly improved without interference, and therefore overlapping of lens imaging is physically realized. Compared with the prior art, the method has the advantages that the problem that devices in the imaging system are set according to specified parameters is not needed to be considered, the design of the optical system is provided with greater flexibility, the volume of the optical system is smaller, the image processing algorithm is simplified, the image splicing processing difficulty is simplified because the obtained images are partially overlapped, the response speed of the imaging system is improved, the resolution of the image is improved, and better imaging quality can be obtained.
The imaging device and the imaging method adopting the liquid crystal lens array can be applied to electronic equipment such as capsule medical equipment, aviation shooting equipment, intelligent automobiles, robots, intelligent wearing equipment, monitoring equipment, medical microscopes, minimally invasive medical equipment, missiles with cameras and the like.
The foregoing description is only of embodiments of the present invention, and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (10)
1. A liquid crystal lens array, comprising: the liquid crystal display device comprises a plurality of liquid crystal lenses distributed in an array and a lens array driving unit, wherein the lens array driving unit drives each liquid crystal lens to switch between a lens state and a non-lens state, and in one driving period, at the moment T1, a first liquid crystal lens in any two adjacent liquid crystal lenses with the nearest interval is in the lens state, and a second liquid crystal lens is in the non-lens state; at time T2, the first liquid crystal lens is in a non-lens state, and the second liquid crystal lens is in a lens state.
2. The liquid crystal lens array according to claim 1, wherein the lens array driving unit includes:
the micro control circuit is used for controlling the lens array driving unit to work;
a signal generating circuit for generating an initial driving signal for driving the liquid crystal lens;
the address decoder is used for receiving a signal for inquiring the address of the liquid crystal lens to be driven, which is output by the micro control circuit, and outputting address information of the liquid crystal lens to be driven;
the signal amplitude modulation circuit is used for carrying out amplitude modulation on the initial driving signal according to the control signal of the liquid crystal lens to be driven, which is output by the micro control circuit, and the address information sent by the address decoder, and outputting a driving signal to drive the liquid crystal lens to be driven, which corresponds to the address information;
the lens area of the liquid crystal lens array in a lens state when driven is larger than the electrode area of the liquid crystal lens array.
3. The liquid crystal lens array according to claim 2, wherein the lens array driving unit includes:
and the signal correction circuit is used for removing the direct current component of the initial driving signal generated by the signal generation circuit and outputting the initial driving signal to the signal amplitude modulation circuit.
4. A liquid crystal lens array according to claim 3, wherein said signal amplitude modulation circuit comprises:
each signal amplitude modulation module corresponds to one liquid crystal lens, and each signal amplitude modulation module outputs a first driving voltage and a second driving voltage different from the first driving voltage to drive the corresponding liquid crystal lens.
5. The lc lens array of claim 4 wherein said address decoder and said micro-control circuit output signals to said signal amplitude modulation circuit through a TFT array or an FPGA array.
6. The lc lens array of claim 5, wherein the micro-control circuit includes a data driver for outputting control signals, the address decoder and the data driver outputting signals to the signal amplitude modulation circuit through the TFT array, wherein the data driver outputting control signals through a plurality of data lines, the address decoder outputting address information through a plurality of address lines, the TFT array including a plurality of thin film transistors, each of the thin film transistors including a source electrode, a gate electrode, and a drain electrode, the source electrode being connected to a data line, the gate electrode being connected to an address line, the drain electrode being connected to the signal amplitude modulation circuit.
7. The liquid crystal lens array of any one of claims 2 to 6, wherein the liquid crystal lens comprises: each liquid crystal lens comprises a first substrate, a second substrate, a first electrode, a second electrode and a third electrode, wherein the first electrode and the second electrode are arranged on the first substrate, the third electrode is arranged on the second substrate, the liquid crystal layer is arranged between the second electrode and the third electrode, the first electrode and the second electrode are insulated from each other, at least a part of the first electrode and the second electrode are not overlapped, the first electrode and the second electrode are driving electrodes, and the third electrode is a common electrode.
8. The liquid crystal lens array of claim 7, wherein the second electrode has a circular shape or a regular hexagonal shape.
9. An imaging apparatus for capturing a scene to form an image of the scene, comprising: the main lens unit, the image sensor, the image processing controller and the memory, wherein the imaging device further comprises: the liquid crystal lens array is arranged between the main lens unit and the image sensor, and the image processing controller calls program instructions stored in the memory to control the image sensor and the liquid crystal lens array to work, wherein the liquid crystal lens array is the liquid crystal lens array according to any one of claims 1 to 8.
10. An imaging method for capturing an image of a scene to form an image of the scene, comprising: s10, providing a liquid crystal lens array, comprising: a plurality of liquid crystal lenses distributed in an array, and a lens array driving unit that drives each liquid crystal lens to switch between a lens state and a non-lens state; s20, in a driving period, at the time T1, driving a first liquid crystal lens in any two adjacent liquid crystal lenses with the nearest distance to each other to be in a lens state, and driving a second liquid crystal lens in a non-lens state; s30, driving the first liquid crystal lens to be in a non-lens state and driving the second liquid crystal lens to be in a lens state at the time T2; s40, synthesizing the scene image according to the first image of the first liquid crystal lens in the lens state at the moment T1 and the second image of the second liquid crystal lens in the lens state at the moment T2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610755321.1A CN106168727B (en) | 2016-08-29 | 2016-08-29 | Liquid crystal lens array, imaging device and method |
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| CN108267897A (en) * | 2016-12-30 | 2018-07-10 | 深圳超多维光电子有限公司 | polarization imaging device and method |
| WO2018190627A1 (en) | 2017-04-11 | 2018-10-18 | 엘지이노텍(주) | Liquid lens control circuit |
| TWI663430B (en) * | 2017-11-27 | 2019-06-21 | 點晶科技股份有限公司 | Multi-function lens device |
| CN110865472B (en) * | 2018-08-28 | 2021-05-25 | 电子科技大学 | Liquid crystal lens array device, imaging apparatus and imaging method |
| CN110166676B (en) * | 2019-06-20 | 2021-02-26 | 京东方科技集团股份有限公司 | Imaging device, imaging control method, electronic device and medium |
| CN110266861B (en) * | 2019-07-23 | 2022-04-19 | 京东方科技集团股份有限公司 | Display panel and display device |
| CN113514988B (en) * | 2021-04-28 | 2022-09-13 | 南昌虚拟现实研究院股份有限公司 | Zoom liquid crystal lens and driving method thereof |
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| CN101762896A (en) * | 2008-12-22 | 2010-06-30 | 索尼株式会社 | Lens array device and image display |
| CN102809840A (en) * | 2011-06-03 | 2012-12-05 | 索尼公司 | Display apparatus and variable lens array |
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| US8089695B2 (en) * | 2007-09-27 | 2012-01-03 | Seiko Epson Corporation | Line head and image forming apparatus using the same |
| CN102821295B (en) * | 2012-09-03 | 2014-10-08 | 四川大学 | Convergent type integrated imaging shooting method |
| JP6447052B2 (en) * | 2014-11-25 | 2019-01-09 | コニカミノルタ株式会社 | Optical writing apparatus and image forming apparatus |
| CN105785575B (en) * | 2014-12-24 | 2018-01-12 | 深圳超多维光电子有限公司 | 3 d display device |
| CN105842888A (en) * | 2016-05-31 | 2016-08-10 | 成都微晶景泰科技有限公司 | Quick focusing optical element and imaging device |
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| CN101762896A (en) * | 2008-12-22 | 2010-06-30 | 索尼株式会社 | Lens array device and image display |
| CN102809840A (en) * | 2011-06-03 | 2012-12-05 | 索尼公司 | Display apparatus and variable lens array |
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