CN115047687B - Array device capable of independently controlling lens units, imaging device and driving method - Google Patents
Array device capable of independently controlling lens units, imaging device and driving method Download PDFInfo
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- CN115047687B CN115047687B CN202110263977.2A CN202110263977A CN115047687B CN 115047687 B CN115047687 B CN 115047687B CN 202110263977 A CN202110263977 A CN 202110263977A CN 115047687 B CN115047687 B CN 115047687B
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000003384 imaging method Methods 0.000 title claims abstract description 9
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 131
- 239000000758 substrate Substances 0.000 claims abstract description 67
- 230000005684 electric field Effects 0.000 claims abstract description 34
- 230000008054 signal transmission Effects 0.000 claims abstract description 14
- 230000003287 optical effect Effects 0.000 claims description 7
- 238000009826 distribution Methods 0.000 abstract description 27
- 238000012634 optical imaging Methods 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 description 11
- 230000000295 complement effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 230000004075 alteration Effects 0.000 description 6
- 238000000605 extraction Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 210000004027 cell Anatomy 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- 238000007667 floating Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 210000003644 lens cell Anatomy 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
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- 238000004891 communication Methods 0.000 description 1
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- 239000004065 semiconductor Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
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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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal (AREA)
- Geometry (AREA)
Abstract
The invention belongs to the technical field of optical imaging, and particularly relates to an array device capable of independently controlling a lens unit, an imaging device and a driving method. The array device capable of independently controlling the lens units comprises a first substrate, a second substrate and a liquid crystal layer arranged between the first substrate and the second substrate, wherein a first pattern electrode and a plurality of first electrode units with independent signal transmission lines are arranged on one side of the first substrate, which faces the liquid crystal layer, a third pattern electrode is arranged on one side of the first substrate, which faces the liquid crystal layer, and a second pattern electrode and a plurality of second electrode units with independent signal transmission lines are arranged on one side of the second substrate, which faces the liquid crystal layer, and a fourth pattern electrode is arranged on one side of the second substrate, which faces the liquid crystal layer. The invention can eliminate the influence of the outgoing line on the electric field distribution of the lens area in the device.
Description
Technical Field
The present invention relates to the field of optical imaging technology, and in particular, to an array device capable of independently controlling lens units, an imaging apparatus, and a driving method.
Background
Conventional lc lens structures use patterned electrodes to form a non-uniform electric field distribution across the cell, with the lc molecules rotating under their influence to produce refractive index changes, forming a nearly parabolic refractive index distribution in the plane. When voltage is applied to the electrodes on the two sides of the liquid crystal box, potential difference is generated in the liquid crystal box, the potential difference at different positions is different, and nonuniform potential distribution is formed in a plane, so that the refractive index distribution of liquid crystal molecules changes along with the voltage, and the phase of incident light is modulated to be diffused or converged. In practical application, the aperture of the liquid crystal lens is often limited by the performance and voltage of the lens, and the aperture of the light transmission is smaller, so that the aperture of the liquid crystal lens cannot be matched with the aperture of the glass lens and the window of the detector. Therefore, in order to cope with a large-caliber use scene, a light field camera, and the like, a liquid crystal lens array has been attracting attention. For the traditional round hole liquid crystal lens structure, to realize the independent control of each liquid crystal lens in the liquid crystal lens array, the structure mode that all round hole pattern electrodes and round electrodes are in the same plane and the round electrodes are provided with extraction electrodes at the openings of the round rings is generally adopted. However, the conventional liquid crystal lens with the patterned electrode structure needs high voltage control, and in the structure, the outgoing line and the side electrode generally have larger voltage difference, so that the phase distribution of the peripheral liquid crystal lens is interfered by the voltage of the outgoing electrode, and the problems of asymmetric phase distribution, increased aberration and the like occur.
Disclosure of Invention
In view of the above, the embodiments of the present invention provide an array device, an imaging device and a driving method capable of independently controlling lens units, so as to solve the technical problems of asymmetric distribution and increased aberration of peripheral liquid crystal lenses caused by a lead-out circuit in the prior art.
The technical scheme adopted by the invention is as follows:
In a first aspect, the invention provides an array device capable of independently controlling lens units, comprising a first substrate, a second substrate and a liquid crystal layer arranged between the first substrate and the second substrate, wherein one side of the first substrate, which faces away from the liquid crystal layer, is provided with a first pattern electrode and a plurality of first electrode units with independent signal transmission lines, one side of the first substrate, which faces towards the liquid crystal layer, is provided with a third pattern electrode, one side of the second substrate, which faces away from the liquid crystal layer, is provided with a second pattern electrode and a plurality of second electrode units with independent signal transmission lines, and one side of the second substrate, which faces towards the liquid crystal layer, is provided with a fourth pattern electrode.
Preferably, the third pattern electrode includes a plurality of first pattern electrode units which are not conductive, the projection of the first pattern electrode units on the reference plane and the projection of the second pattern electrode units on the reference plane are staggered, the fourth pattern electrode includes a plurality of second pattern electrode units which are not conductive, the projection of the second pattern electrode units on the reference plane and the projection of the first pattern electrode units on the reference plane are staggered, and the reference plane is parallel to the plane of the liquid crystal layer.
Preferably, the first pattern electrode is provided with a plurality of first hole-shaped units corresponding to the first electrode units one by one, the projection of the first electrode units on the reference plane is positioned in the projection of the corresponding first hole-shaped units on the reference plane, and the second pattern electrode is provided with a plurality of second hole-shaped units corresponding to the second electrode units one by one, and the projection of the second electrode units on the reference plane is positioned in the projection of the corresponding second hole-shaped units on the reference plane.
Preferably, the first pattern electrode units are arranged at intervals in a square array, the second pattern electrode units are arranged at intervals in a square array, the first electrode units are arranged at intervals in a square array, and the second electrode units are arranged at intervals in a square array.
Preferably, the first pattern electrode unit is a square electrode unit, the second pattern electrode is a square electrode unit, the first hole unit is a round hole unit, the first electrode unit is a round electrode unit, the second hole unit is a round hole unit, and the second electrode unit is a round electrode unit.
Preferably, the first pattern electrode units are rectangular electrode units extending from one end to the opposite other end of the third pattern electrode along the first direction, the rectangular electrode units are arranged at intervals along the second direction, the second pattern electrode units are rectangular electrode units extending from one end to the opposite other end of the fourth pattern electrode along the first direction, the rectangular electrode units are arranged at intervals along the second direction, the first electrode units form a plurality of groups of first electrode unit groups, the first electrode units in the same group are arranged at intervals along the second direction, the second electrode units form a plurality of groups of second electrode unit groups, the second electrode units in the same group are arranged at intervals along the second direction, the first direction and the second direction are parallel to the reference plane, and the first direction and the second direction are mutually perpendicular.
Preferably, the projection of the first electrode unit on the reference plane and the projection of the second electrode unit on the reference plane are staggered with respect to each other.
Preferably, the third pattern electrode and the fourth pattern electrode are passive electrodes that can generate an induced electric field.
In a second aspect, the present invention also provides an imaging apparatus comprising a main lens and an image sensor, and further comprising an array device of independently controllable lens units according to the first aspect disposed between the main lens and the image sensor.
In a third aspect, the present invention also provides a liquid crystal lens array device driving method for driving the array device of the independently controllable lens units of the first aspect, the method comprising the steps of:
Acquiring preset focal power of the liquid crystal lens unit corresponding to each first electrode unit and/or each second electrode unit;
determining a first driving voltage applied to the first pattern electrode, a second driving voltage applied to the first electrode unit, a third driving voltage applied to the second pattern electrode, and a fourth driving voltage applied to the second electrode unit according to the preset optical power;
applying a first driving voltage to the first pattern electrode, applying a second driving voltage to the first electrode unit, applying a third driving voltage to the second pattern electrode, and applying a fourth driving voltage to the second electrode unit so that each first electrode unit and/or the liquid crystal lens unit corresponding to the second electrode unit works in the state of preset focal power.
The array device capable of independently controlling the lens units has the beneficial effects that when the array device is in operation, the first pattern electrode, the second pattern electrode, the first electrode unit and the plurality of second electrode units of the first substrate and the second substrate are electrified to form potential differences in the liquid crystal layer, the third pattern electrode and the fourth pattern electrode on the inner sides of the first substrate and the second substrate are used as floating electrodes, the electric field distribution is shaped, the electric field intensity direction of the liquid crystal layer is kept perpendicular to the substrate surface, and the consistency of the rotation direction of liquid crystal molecules is ensured. The influence of the electric field of the outgoing lines of the first electrode unit and the second electrode unit which are electrified on the outer sides of the first substrate and the second substrate on the peripheral area is counteracted by the third pattern electrode and the fourth pattern electrode, so that the influence of the outgoing lines on the electric field distribution of the lens area in the device can be eliminated, the uniformity and the symmetry of the phase distribution of the circuit liquid crystal lens array device are obviously improved, and the aberration is reduced.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described, and it is within the scope of the present invention to obtain other drawings according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram showing the structure of an array device of individually controllable lens units in embodiment 1 of the present invention;
fig. 2 is a schematic structural view of a third pattern electrode in embodiment 2;
Fig. 3 is a schematic structural view of a fourth pattern electrode in embodiment 2;
fig. 4 is a schematic structural view of the first pattern electrode and the first electrode unit in embodiment 2;
fig. 5 is a schematic structural view of a second pattern electrode and a second electrode unit in embodiment 2;
FIG. 6 is a schematic view of the projection of each electrode on a reference plane in example 2;
fig. 7 is a schematic structural view of the first pattern electrode and the first electrode unit in embodiment 3;
Fig. 8 is a schematic structural view of a second pattern electrode and a second electrode unit in embodiment 3;
Fig. 9 is a schematic structural view of a third pattern electrode in embodiment 3;
fig. 10 is a schematic structural view of a fourth pattern electrode in embodiment 3;
FIG. 11 is a schematic view showing projection of each electrode on a reference plane in example 3;
FIG. 12 is a flow chart of a method of the present invention for independently controlling an array device of lens units;
Fig. 13 is a schematic structural view of an array device of individually controllable lens units in embodiment 2 of the present invention.
In the figure, the parts are 10:first pattern electrode, 11:first round hole electrode, 20:first electrode unit, 21:first round electrode, 22:second round electrode, 30:second pattern electrode, 31:second round hole electrode, 40:second electrode unit, 41:third round electrode, 42:fourth round electrode, 51:first substrate, 52:second substrate, 60:third pattern electrode, 61:first square electrode, 62:second square electrode, 71:first alignment layer, 72:second alignment layer, 81:liquid crystal layer, 90:fourth pattern electrode, 91:third square electrode, 92:fourth square electrode.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising" does not exclude the presence of additional identical elements in a process, method, article, or apparatus that comprises the element. If not conflicting, the embodiments of the present application and the features of the embodiments may be combined with each other, which are all within the protection scope of the present application.
Example 1:
The embodiment provides an array device capable of independently controlling lens units, as shown in fig. 1, the liquid crystal lens array device comprises a first substrate 51, a second substrate 52 and a liquid crystal layer 81 positioned between the first substrate 51 and the second substrate 52, wherein a first pattern electrode 10 and a plurality of first electrode units 20 with independent signal transmission lines are arranged on one side of the first substrate 51 facing away from the liquid crystal layer 81, a third pattern electrode 60 is arranged on one side of the first substrate 51 facing away from the liquid crystal layer 81, a second pattern electrode 31 and a plurality of second electrode units 40 with independent signal transmission lines are arranged on one side of the second substrate 52 facing away from the liquid crystal layer 81, and a fourth pattern electrode 90 is arranged on one side of the second substrate 52 facing towards the liquid crystal layer 81. The first alignment layer 71 and the second alignment layer 72 may also be disposed on both sides of the liquid crystal layer 81.
The first substrate 51 and the second substrate 52 are transparent substrates made of transparent materials, preferably glass substrates. After applying the driving voltages to the respective pattern electrodes and the respective electrode units (the first electrode unit 20 and the second electrode unit 40) in the liquid crystal lens array device, the liquid crystal lens array device may form a plurality of liquid crystal lens units, each of which may be used as a separate one of the liquid crystal lenses, and the liquid crystal lens unit corresponding to the electrode unit may be separately controlled by separately controlling the driving voltages applied to the respective electrode units. The extraction circuit of the electrode unit is used for independently providing driving voltage for the electrode unit corresponding to the signal transmission line so as to realize independent control of the liquid crystal lens unit corresponding to the electrode unit. The first pattern electrode 10, the second pattern electrode 31, the third pattern electrode 60, and the fourth pattern electrode 90 may be formed by processing a plane according to a predetermined pattern. The pattern may be various shapes, such as a circle, an ellipse, a multi-deformation, a square, a ring, etc., and may be various shapes of holes, such as a circle, an ellipse, a multi-deformation, a square, etc., and the specific pattern shape of the pattern electrode may be set according to the application requirements, without limitation. The signal transmission line may be, but not limited to, an extraction circuit, an extraction line, an extraction electrode, a contact, a pin, or the like.
The first pattern electrode 10 and the second pattern electrode 31 respectively disposed on both sides of the liquid crystal layer 81 in the present embodiment may serve as common electrodes of the pattern electrodes and the electrode units on the opposite sides of the liquid crystal layer 81. For example, the first pattern electrode 10 may serve as a common electrode of the second pattern electrode 31 and the second electrode unit 40, and the second pattern electrode 31 may serve as each electrode of the first pattern electrode 10 and the second electrode unit 40. Since the first electrode unit 20 and the second electrode unit 40 are respectively located at two sides of the liquid crystal layer 81, that is, the first electrode unit 20 and the second electrode unit 40 are not in the same plane parallel to the liquid crystal layer 81, the projections of the first electrode unit 20 and the second electrode unit 40 on the reference plane can be close together or even partially overlap without mutual interference, so that the overall aperture ratio of the liquid crystal lens array is greatly improved.
As shown in fig. 4,5, 7 and 8, in this embodiment, the first pattern electrode 10 is provided with a plurality of first hole-shaped units corresponding to the first electrode units 20 one by one, the projection of the first electrode units 20 on the reference plane is located in the projection of the corresponding first hole-shaped units on the reference plane, and the second pattern electrode 31 is provided with a plurality of second hole-shaped units corresponding to the second electrode units 40 one by one, and the projection of the second electrode units 40 on the reference plane is located in the projection of the corresponding second hole-shaped units on the reference plane.
The first pattern electrode 10 or the second pattern electrode 31 may be processed on the surface electrode from a plurality of holes, each of which serves as one of the first hole-shaped units or one of the second hole-shaped units. In the present embodiment, a first electrode unit 20 is disposed corresponding to each first hole unit, and a second electrode unit 40 is disposed corresponding to each second hole unit. The first electrode unit 20 adopts a shape matched with the first hole-shaped unit, for example, the first hole-shaped unit is a circular hole, the first electrode unit 20 is correspondingly circular, and the first electrode unit 20 is filled in the corresponding circular hole, for example, the first hole-shaped unit is a square hole, the first electrode unit 20 is correspondingly square, and the first electrode unit 20 is filled in the corresponding square hole, for example, the first hole-shaped unit is a regular polygon hole, the first electrode unit 20 is correspondingly a regular polygon hole with the same edge number, and the first electrode unit 20 is filled in the corresponding regular polygon hole.
The second electrode unit 40 adopts a shape matched with the second hole unit in the same way, for example, the second hole unit is a round hole, the second electrode unit 40 is correspondingly round, and the second electrode unit 40 is filled in the corresponding round hole, for example, the second hole unit is a square hole, the second electrode unit 40 is correspondingly square, and the second electrode unit 40 is filled in the corresponding square hole, for example, the second hole unit is a regular polygon hole, the second electrode unit 40 is correspondingly a regular polygon hole with the same number of sides, and the second electrode unit 40 is filled in the corresponding regular polygon hole.
For each first electrode unit 20, the optical power of the liquid crystal lens formed corresponding to the first electrode unit 20 is controlled by controlling the voltage difference applied between the first electrode unit 20 and the second pattern electrode 31 and the voltage difference applied between the first pattern electrode 10 and the second pattern electrode 31.
In the same manner, for each of the second electrode units 40, the optical power of the liquid crystal lens formed corresponding to the second electrode unit 40 is controlled by controlling the voltage difference applied between the second electrode unit 40 and the first pattern electrode 10 and the voltage difference applied between the second pattern electrode 31 and the first pattern electrode 10.
The first pattern electrode 10 and the first electrode unit 20 may be in the same layer or different layers, and the second pattern electrode 31 and the second electrode unit 40 may be in the same layer or different layers, which is not limited herein.
In the present embodiment, even pattern electrodes, that is, the third pattern electrode 60 and the fourth pattern electrode 90, are provided on the side of the first substrate 51 and the second substrate 52 facing the liquid crystal layer 81.
When the liquid crystal lens works, the first pattern electrode 10, the second pattern electrode 31, the first electrode unit 20 and the plurality of second electrode units 40 of the first substrate 51 and the second substrate 52 are electrified to form potential differences in the liquid crystal layer 81, the third pattern electrode 60 and the fourth pattern electrode 90 on the inner sides of the first substrate 51 and the second substrate 52 serve as floating electrodes, the electric field distribution is shaped to keep the electric field intensity direction of the liquid crystal layer 81 vertical to the substrate surface, and the rotation direction of liquid crystal molecules is ensured to be consistent. The influence of the electric field of the outgoing lines of the first electrode unit 20 and the second electrode unit 40, which are electrified outside the first substrate 51 and the second substrate 52, on the peripheral area is counteracted by the third pattern electrode 60 and the fourth pattern electrode 90, so that the influence of the outgoing lines on the electric field distribution of the lens area in the device can be eliminated, the uniformity and the symmetry of the phase distribution of the circuit liquid crystal lens array device are remarkably improved, and the aberration is reduced.
As shown in fig. 2, 3, 9 and 10, the third pattern electrode 60 includes a plurality of first pattern electrode units that are non-conductive, the projection of the first pattern electrode units on the reference plane is offset from the projection of the second pattern electrode units 40 on the reference plane, the fourth pattern electrode 90 includes a plurality of second pattern electrode units that are non-conductive, the projection of the second pattern electrode units on the reference plane is offset from the projection of the first pattern electrode units 20 on the reference plane, and the reference plane is parallel to the plane of the liquid crystal layer 81.
The first pattern electrode units refer to electrodes having a set shape, each of the electrodes serves as one first pattern electrode unit, and a plurality of first pattern electrode units together form a third pattern electrode 60. The shapes of the respective first pattern electrode units may be the same or different.
The second pattern electrode unit refers to electrodes having a set shape, each of the electrodes serves as a first pattern electrode unit, and a plurality of the first pattern electrode units together form a fourth pattern electrode 90. The shapes of the respective second pattern electrode units may be the same or different. The shape of each first pattern electrode unit may be the same as or different from the shape of each first pattern electrode unit.
The fact that the projection of the first graphic electrode unit on the reference plane is staggered with the projection of the second graphic electrode unit 40 on the reference plane means that the projection of the first graphic electrode unit on the reference plane is located in a blank area without the second electrode unit 40 on the reference plane, and the projection of the second electrode unit 40 on the reference plane is also located in a blank area without the first graphic electrode unit on the reference plane. This causes the projection of the first patterned electrode unit onto the reference plane to form a complementary pattern to the projection of the second patterned electrode unit 40 onto the reference plane.
Similarly, the fact that the projection of the second patterned electrode unit on the reference plane is offset from the projection of the first patterned electrode unit 20 on the reference plane means that the projection of the second patterned electrode unit on the reference plane is located in a blank area without the first patterned electrode unit 20 on the reference plane, and the projection of the first patterned electrode unit 20 on the reference plane is also located in a blank area without the second patterned electrode unit on the reference plane. This causes the projection of the second patterned electrode unit onto the reference plane to form a complementary pattern to the first electrode unit 20 on the reference plane.
Since the positions of the pattern electrodes (the third pattern electrode 60 and the fourth pattern electrode 90) on the side close to the liquid crystal layer 81 and the positions of the electrode units (the first electrode unit 20 and the second electrode unit 40) on the same substrate are complementary, the influence of the electric field of the lead wires of the electrode units energized on the outside on the peripheral region is canceled by the pattern electrodes complementary thereto, and therefore the influence of the lead wires on the electric field distribution of the lens region in the device can be eliminated.
In addition, the third pattern electrode 60 and the fourth pattern electrode 90 are passive electrodes that can generate an induced electric field. That is, the third pattern electrode 60 and the fourth pattern electrode 90 do not need to be provided with external voltages, the third pattern electrode 60 and the fourth pattern electrode 90 can generate an induced electric field through an electric field generated by the signal transmission line, the induced electric field has a suppressing effect on the electric field generated by the signal transmission line, the structure is further simplified by adopting the mode, the induced electric field can be automatically regulated according to the magnitude of the electric field generated by the signal transmission line, and a better suppressing effect can be always achieved on the electric field generated by the signal transmission line.
In the present embodiment, the projection of the first electrode unit 20 on the reference plane and the projection of the second electrode unit 40 on the reference plane are offset from each other.
I.e. the projection of the first electrode unit 20 onto said reference plane is located in the reference plane without the empty area of the second electrode unit 40, as is the projection of the second electrode unit 40 onto the reference plane without the empty area of the first electrode unit 20. This causes the projection of the first electrode unit 20 on the reference plane to form a complementary pattern to the projection of the second electrode unit 40 on the reference plane. With the above structure, the positions of the liquid crystal lens formed by the first electrode unit 20 and the liquid crystal lens formed by the second electrode unit are closer to each other or even are connected with each other at the edge, so that the aperture ratio of the liquid crystal lens array is greatly increased.
In summary, the array device capable of independently controlling the lens unit according to the embodiment can effectively reduce the voltage influence of the extraction electrode, increase the occupation ratio of the effective area, and has the advantages of simple structure and low processing difficulty.
Example 2
In this embodiment, as shown in fig. 2 and 3, the first pattern electrode units are arranged at intervals in a square array, the second pattern electrode units are arranged at intervals in a square array, the first electrode units 20 are arranged at intervals in a square array, and the second electrode units 40 are arranged at intervals in a square array. As shown in fig. 4 and 5, the first pattern electrode unit is a square electrode unit, the second pattern electrode is a square electrode unit, the first hole-shaped unit is a round hole-shaped unit, the first electrode unit 20 is a round electrode unit, the second hole-shaped unit is a round hole-shaped unit, and the second electrode unit 40 is a round electrode unit.
Namely, the two pattern electrodes (the third pattern electrode 60 and the fourth pattern electrode 90) of the first substrate 51 and the second substrate 52 facing the liquid crystal layer 81 are square pattern electrodes, the square pattern electrodes are arranged in a checkerboard manner, such as the first square electrode 61, the second square electrode 62 and the third square electrode 91 and the fourth square electrode 92 in fig. 2 and 92 in fig. 3 are staggered in the vertical and horizontal directions, each square electrode is independent, namely, the adjacent two square electrodes are non-conductive, and the electrode patterns on the first substrate 51 and the second substrate 52 are complementary, namely, the square electrode area of one side substrate corresponds to the blank area in the electrode of the other side.
The first pattern electrode 10 and the second pattern electrode 31 on the sides of the first substrate 51 and the second substrate 52 facing away from the liquid crystal layer 81 are pattern electrodes having circular hole-shaped units, and the corresponding first electrode unit 20 and second electrode unit 40 are circular electrode units.
As shown in FIG. 6, the array arrangement of the round electrode units is staggered, the centers of the round electrode units are aligned to the centers of blank areas of square electrode unit areas on the other side of the same substrate, namely, the centers of the round electrode units and the centers of the square electrode units are staggered, and electrode patterns on the two substrates are complementary, namely, the round electrode area of one side of the substrate corresponds to a non-round electrode area in the electrode on the other side. For the liquid crystal lens cell formed corresponding to each electrode cell (the first electrode cell 20 and the second electrode cell 40), the center of the electrode cell may be the center of the lens cell.
Herein, square electrode units refer to solid electrode units having a square shape, and round electrode units refer to solid electrode units having a round shape.
The two complementary circular hole pattern electrodes on the two sides can apply voltage, can act as the ground electrode of the opposite side liquid crystal lens to form required voltage distribution, and has one more group of adjustable voltage and phase for the zooming effect of the liquid crystal lens, so that the freedom degree of voltage application is increased, meanwhile, the aberration of the liquid crystal lens is reduced, and the lens performance is improved.
Example 3
In this embodiment, as shown in fig. 9 and 10, the first pattern electrode units are rectangular electrode units extending from one end to the opposite end of the third pattern electrode 60 along the first direction, the rectangular electrode units are arranged at intervals along the second direction, the second pattern electrode units are rectangular electrode units extending from one end to the opposite end of the fourth pattern electrode 90 along the first direction, the rectangular electrode units are arranged at intervals along the second direction, the first electrode units 20 form a plurality of groups of first electrode units 20, the groups of first electrode units 20 are arranged at intervals along the second direction, the first electrode units 20 in the same group are arranged along the first direction, the groups of second electrode units 40 form a plurality of groups of second electrode units 40, the groups of second electrode units 40 in the same group are arranged at intervals along the second direction, the first direction and the second direction are parallel to the reference plane, and the first direction and the second direction are perpendicular to each other.
For example, in fig. 7, two sets of first electrode units 20 are included, each set including five first electrode units 20, and in fig. 8, three sets of second electrode units 40 are included, each set including five second electrode units 40.
As shown in fig. 11, the first hole-shaped unit and the second hole-shaped unit may be circular hole-shaped units, the first electrode unit and the second electrode unit may be circular electrode units, the circular electrode units are adjacent in-line arrangement, the third pattern electrode 60 and the fourth pattern electrode 90 are rectangular electrodes arranged at equal intervals in one direction, and the width is the diameter of the circular electrode unit. The positions of the outgoing lines correspond to the positions of floating electrodes (the third pattern electrode 60 or the fourth pattern electrode 90) on the same substrate, and different voltages are applied to the round hole electrodes and the plurality of round electrodes to form potential differences, so that liquid crystal molecules are driven to deflect to form different refractive index distributions, and focusing effects are achieved. The liquid crystal lens array structure has compact arrangement mode, compared with a liquid crystal lens array arranged on the same plane, the effective area of the liquid crystal lens in a unit area is improved, the electric field influence on a lens area when voltage is applied to an outgoing line is reduced by the arrangement mode of upper and lower interval arrangement and the design of floating electrodes close to a liquid crystal layer 81, the imaging quality of the liquid crystal lens area is ensured, a circular hole electrode is used for replacing a ground electrode in a driving mode, the lens structure is simplified, the freedom degree of voltage application is increased, the aberration of the liquid crystal lens in the driving mode is reduced compared with that in the traditional mode, and the lens performance is improved.
Example 4
The present embodiment provides an imaging apparatus comprising a main lens and an image sensor, the apparatus comprising an array device of independently controllable lens units in any of the foregoing embodiments disposed between the main lens and the image sensor. Please refer to the previous descriptions of embodiments 1 to 3 for details, and are not repeated here.
Example 5
In addition, in combination with the array device of the independently controllable lens unit in the above-described embodiment, an embodiment of the present invention may provide a liquid crystal lens array device driving method for driving the array device of the independently controllable lens unit in the above-described embodiment, as shown in fig. 12, the method including the steps of:
S1, acquiring preset focal power of a liquid crystal lens unit corresponding to each first electrode unit and/or each second electrode unit;
S2, determining a first driving voltage applied to the first pattern electrode, a second driving voltage applied to the first electrode unit, a third driving voltage applied to the second pattern electrode and a fourth driving voltage applied to the second electrode unit according to the preset focal power;
And S3, applying a first driving voltage to the first pattern electrode, applying a second driving voltage to the first electrode unit, applying a third driving voltage to the second pattern electrode, and applying a fourth driving voltage to the second electrode unit so that each first electrode unit and/or the liquid crystal lens unit corresponding to the second electrode unit work in the state of preset focal power.
In this embodiment, the first electrode unit and the second electrode unit may be driven in a time-sharing manner, or the first electrode unit and the second electrode unit may be driven simultaneously.
When the time-sharing driving is performed, the second pattern electrode is used as a common electrode at the time T1, the first voltage V1 is applied between the first electrode unit and the second pattern electrode, the second voltage V2 is applied between the first pattern electrode and the second pattern electrode, when V1> V2, the electric field distribution enables the central refractive index of the liquid crystal lens to be smaller than that of the edge region, the formed liquid crystal lens unit is in a positive lens state, when V1< V2, the electric field distribution enables the central refractive index of the liquid crystal lens to be larger than that of the edge region, and the formed liquid crystal lens unit is in a positive lens state.
The first pattern electrode is used as a common electrode at the time T2, a third voltage V3 is applied between the second electrode unit and the first pattern electrode, a fourth voltage V4 is applied between the second pattern electrode and the first pattern electrode, when V3 is more than V4, the electric field distribution makes the central refractive index of the liquid crystal lens smaller than that of the edge area, the formed liquid crystal lens unit is in a positive lens state, when V3 is more than V4, the electric field distribution makes the central refractive index of the liquid crystal lens larger than that of the edge area, and the formed liquid crystal lens unit is in a positive lens state.
In the following, a case where the first electrode unit and the second electrode unit are simultaneously driven is described by taking the array device of the independently controllable lens unit in fig. 13 as an example, in which fig. 13 includes two first electrode units of the first circular electrode 21 and the second circular electrode 22 and two second electrode units of the third circular electrode 41 and the fourth circular electrode 42.
For example, in fig. 13, two liquid crystal lenses corresponding to the first circular electrode 21 and the fourth circular electrode 42 are used, and in order to drive the two liquid crystal lenses at the same time, corresponding voltages need to be applied to the first circular hole electrode 11, the first circular electrode 21, the second circular hole electrode 31, and the fourth circular electrode 42. Since the liquid crystal molecules in the device deflect with the change of the electric field, driving the liquid crystal lens creates a corresponding potential difference in the corresponding lens region. In this embodiment, the liquid crystal layer is a positive liquid crystal, and the rubbing directions of the upper and lower alignment layers are antiparallel, so that the initial state of the liquid crystal molecules is such that the long axes are aligned in the substrate plane direction. The driving power used in the examples was a high voltage square wave with a frequency of 1kHz, and the voltage values described below were all effective values.
When the liquid crystal lens corresponding to the first circular electrode 21 works in a positive lens state and the liquid crystal lens corresponding to the fourth circular electrode 42 works in a positive lens state, the driving method is that 40V voltage is applied to the first circular hole electrode 11, 15V voltage is applied to the first circular electrode 21, 10V voltage is applied to the second circular hole electrode 31, 35V voltage is applied to the fourth circular electrode 42, at the moment, the voltage difference between the edge position electrodes of the liquid crystal lens corresponding to the first circular electrode 21 and the fourth circular electrode 42 is 30V at the same time, the voltage difference between the center position electrodes of the lens is 5V at the same time, and the electric field distribution enables the central refractive index of the liquid crystal lens to be larger than that of the edge region, so that the liquid crystal lens is in a positive lens state. At this time, the states of the corresponding liquid crystal lenses can be respectively changed by adjusting the voltages corresponding to the first circular electrode 21 and the fourth circular electrode 42, so as to realize the electric control focusing effect.
When the liquid crystal lens corresponding to the first circular electrode 21 is operated in a positive lens state and the liquid crystal lens corresponding to the fourth circular electrode 42 is operated in a negative lens state, the driving method is that 55V voltage is applied to the first circular electrode 11, 35V voltage is applied to the first circular electrode 21, 25V voltage is applied to the second circular electrode 31, and 5V voltage is applied to the fourth circular electrode 42, at the same time, the voltage difference between the edge position electrodes of the liquid crystal lens corresponding to the first circular electrode 21 and the fourth circular electrode 42 is 30V, the voltage difference between the lens center position electrodes corresponding to the fourth circular electrode 42 is 50V, the electric field distribution makes the refractive index of the liquid crystal lens center smaller than that of the edge region, and the liquid crystal lens center refractive index is 10V, and the electric field distribution makes the refractive index of the liquid crystal lens center larger than that of the edge region, and the liquid crystal lens center position is in a positive lens state. At this time, the states of the corresponding liquid crystal lenses can be respectively changed by adjusting the voltages corresponding to the first circular electrode 21 and the fourth circular electrode 42, so as to realize the electric control focusing effect.
When the liquid crystal lens corresponding to the first circular electrode 21 works in a negative lens state and the liquid crystal lens corresponding to the fourth circular electrode 42 works in a negative lens state, the driving method is that 40V voltage is applied to the first circular electrode 11, 15V voltage is applied to the first circular electrode 21, 45V voltage is applied to the second circular electrode 31, and 70V voltage is applied to the fourth circular electrode 42, at the moment, the voltage difference between the edge position electrodes of the liquid crystal lens corresponding to the first circular electrode 21 and the fourth circular electrode 42 is 5V at the same time, the voltage difference between the center position electrodes of the lens is 30V at the same time, and the electric field distribution makes the central refractive index of the liquid crystal lens smaller than that of the edge region, so that the liquid crystal lens is in a negative lens state. At this time, the states of the corresponding liquid crystal lenses can be respectively changed by adjusting the voltages corresponding to the first circular electrode 21 and the fourth circular electrode 42, so as to realize the electric control focusing effect.
When the liquid crystal lens corresponding to the first circular electrode 21 works in a negative lens state and the liquid crystal lens corresponding to the fourth circular electrode 42 works in a positive lens state, the driving method is that 25V voltage is applied to the first circular electrode 11, 5V voltage is applied to the first circular electrode 21, 55V voltage is applied to the second circular electrode 31, 35V voltage is applied to the fourth circular electrode 42, at the moment, the voltage difference between the edge position electrodes of the liquid crystal lens corresponding to the first circular electrode 21 and the fourth circular electrode 42 is 30V at the same time, the voltage difference between the lens center position electrodes corresponding to the fourth circular electrode 42 is 10V, the electric field distribution makes the central refractive index of the liquid crystal lens larger than that of the edge region, and the liquid crystal lens is in a positive lens state, and the voltage difference between the lens center position electrodes corresponding to the first circular electrode 21 is 50V, and the electric field distribution makes the central refractive index of the liquid crystal lens smaller than that of the edge region, and the liquid crystal lens is in a negative lens state. At this time, the states of the corresponding liquid crystal lenses can be respectively changed by adjusting the voltages corresponding to the first circular electrode 21 and the fourth circular electrode 42, so as to realize the electric control focusing effect.
The above is a detailed description of the image acquisition method, device, equipment and storage medium based on the liquid crystal lens provided by the embodiment of the invention.
It should be understood that the invention is not limited to the particular arrangements and instrumentality described above and shown in the drawings. For the sake of brevity, a detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and shown as examples. The method processes of the present invention are not limited to the specific steps described and shown, but various changes, modifications and additions, or the order between steps may be made by those skilled in the art after appreciating the spirit of the present invention.
The functional blocks shown in the above-described structural block diagrams may be implemented in hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, a plug-in, a function card, or the like. When implemented in software, the elements of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine readable medium or transmitted over transmission media or communication links by a data signal carried in a carrier wave. A "machine-readable medium" may include any medium that can store or transfer information. Examples of machine-readable media include electronic circuitry, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio Frequency (RF) links, and the like. The code segments may be downloaded via computer networks such as the internet, intranets, etc.
It should also be noted that the exemplary embodiments mentioned in this disclosure describe some methods or systems based on a series of steps or devices. The present invention is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, or may be performed in a different order from the order in the embodiments, or several steps may be performed simultaneously.
In the foregoing, only the specific embodiments of the present invention are described, and it will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the systems, modules and units described above may refer to the corresponding processes in the foregoing method embodiments, which are not repeated herein. It should be understood that the scope of the present invention is not limited thereto, and any equivalent modifications or substitutions can be easily made by those skilled in the art within the technical scope of the present invention, and they should be included in the scope of the present invention.
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