CN110865472A - Liquid crystal lens array device, imaging apparatus and imaging method - Google Patents
Liquid crystal lens array device, imaging apparatus and imaging method Download PDFInfo
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- CN110865472A CN110865472A CN201810991068.9A CN201810991068A CN110865472A CN 110865472 A CN110865472 A CN 110865472A CN 201810991068 A CN201810991068 A CN 201810991068A CN 110865472 A CN110865472 A CN 110865472A
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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
- G02F1/1313—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 specially adapted for a particular application
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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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Abstract
The embodiment of the invention discloses a liquid crystal lens array device, an imaging device and an imaging method. The liquid crystal lens array device includes: the liquid crystal display device comprises a first array electrode, a second array electrode and a liquid crystal layer. The first array electrodes include a plurality of first electrode pairs, the second array electrodes include a plurality of second electrode pairs, a projection of the first electrode pairs of the first array electrodes on a reference plane partially overlaps the second electrode pairs of the second array electrodes, the reference plane is parallel to a plane of the liquid crystal layer, the first electrode pairs include first electrodes and second electrodes, the second electrode pairs include third electrodes and fourth electrodes, the first electrodes apply a first voltage and the second electrodes apply a second voltage when the first liquid crystal lens array is formed at time T1, and the second electrode pairs serve as common electrodes; when the second liquid crystal lens array is formed at time T2, the first voltage is applied to the third electrode and the second voltage is applied to the fourth electrode of the second electrode pair, and the first electrode pair serves as a common electrode. The invention has the advantage of high duty cycle.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a liquid crystal lens array device, an imaging device and an imaging method.
Background
A liquid crystal lens array is a lens array based on liquid crystal materials that has emerged in recent years. The liquid crystal is a good photoelectric material, has large photoelectric anisotropy and birefringence, and is widely applied to the fields of optical switches, wavefront detection, phase delay, optical fiber sensing and the like in recent years. The liquid crystal material is placed in an electric field or a magnetic field, and the molecular orientation of the liquid crystal material can generate certain angle deflection along with the electric field or the magnetic field intensity at the position. With this characteristic, by applying an uneven electric field, a gradient index lens is formed, thereby performing operations such as convergence, divergence, and zooming on incident light. The aperture of each microlens of the liquid crystal lens array is small, and has a larger focal power than a single liquid crystal lens.
In the prior art, when imaging is performed by using a liquid crystal lens array, in order to obtain a high-quality image, the aperture ratio of the liquid crystal lens array needs to be increased, and thus the distance between the liquid crystal lenses needs to be reduced as much as possible. Experimental research finds that, in the liquid crystal lens array, when the distance between two adjacent liquid crystal lenses is small, the interference between the two adjacent liquid crystal lenses with the shortest distance is easily generated by adopting the existing driving mode of the liquid crystal lens array, and the imaging quality is influenced when the liquid crystal lens array is applied to the technical fields of imaging and the like.
Disclosure of Invention
In view of this, embodiments of the present invention provide a liquid crystal lens array device, an imaging apparatus and an imaging method, which solve the problem in the prior art that the aperture ratio is affected by an excessively large distance between adjacent microlenses in a liquid crystal lens array.
In one aspect, an embodiment of the present invention provides a liquid crystal lens array device, including: the liquid crystal display device comprises a first array electrode, a second array electrode and a liquid crystal layer clamped between the first array electrode and the second array electrode, wherein the first array electrode comprises a plurality of first electrode pairs, the second array electrode comprises a plurality of second electrode pairs, the projection of the first electrode pairs of the first array electrode on a reference plane is partially overlapped with the second electrode pairs of the second array electrode, the reference plane is parallel to the plane of the liquid crystal layer, the first electrode pairs comprise a first electrode and a second electrode, the second electrode pairs comprise a third electrode and a fourth electrode, when a first liquid crystal lens array is formed at the time T1, the first electrode applies a first voltage, the second electrode applies a second voltage, and the second electrode pairs serve as a common electrode; when the second liquid crystal lens array is formed at time T2, the third electrode of the second electrode pair applies the first voltage, the fourth electrode applies the second voltage, and the first electrode pair serves as the common electrode.
Preferably, a first preset distance is formed between two adjacent first electrode pairs of the first array electrode, and a second preset distance is formed between two adjacent second electrode pairs of the second array electrode.
Preferably, two adjacent first electrode pairs of the first array electrodes are tangent, and two adjacent second electrode pairs of the second array electrodes are tangent.
Preferably, the time T1 includes: at the time t1 and the time t2, the adjacent first electrode pairs respectively work at the time t1 and the time t 2; the time T2 includes: at times t3 and t4, adjacent first electrode pairs are operating at times t3 and t4, respectively.
Preferably, the first electrode and the second electrode of the first electrode pair lie in a first plane, the second electrode lying within the first electrode; the third electrode and the fourth electrode of the second electrode pair are located in a second plane, and the third electrode is located within the fourth electrode.
Preferably, the first electrode and the second electrode of the first electrode pair are not in the same plane, and the projection of the first electrode on the reference plane is located in the projection of the second electrode on the reference plane; the third electrode and the fourth electrode of the second electrode pair are not in the same plane, and the projection of the third electrode on the reference plane is positioned in the projection of the fourth electrode on the reference plane.
Preferably, when the first liquid crystal lens array is formed at time T1, a voltage difference within a first predetermined range is formed between the third electrode and the fourth electrode of the second electrode pair, so that the second electrode pair serves as a common electrode; when the second liquid crystal lens array is formed at time T2, a voltage difference within a second predetermined range is formed between the first electrode and the second electrode of the first electrode pair so that the first electrode pair serves as a common electrode.
Preferably, a first high-impedance film or a first transparent glass substrate is arranged between the first array electrode and the liquid crystal layer, and a second high-impedance film or a second transparent glass substrate is arranged between the second array electrode and the liquid crystal layer.
In another aspect, an embodiment of the present invention further provides an imaging apparatus, including: a main lens and a liquid crystal lens array device, wherein the liquid crystal lens array device includes at least: the liquid crystal display device comprises a first array electrode, a second array electrode and a liquid crystal layer clamped between the first array electrode and the second array electrode, wherein the first array electrode comprises a plurality of first electrode pairs, the second array electrode comprises a plurality of second electrode pairs, the projection of the first electrode pairs of the first array electrode on a reference plane is partially overlapped with the second electrode pairs of the second array electrode, the reference plane is parallel to the plane of the liquid crystal layer, the first electrode pairs comprise a first electrode and a second electrode, the second electrode pairs comprise a third electrode and a fourth electrode, when a first liquid crystal lens array is formed at the time T1, the first electrode applies a first voltage, the second electrode applies a second voltage, and the second electrode pairs serve as a common electrode; when the second liquid crystal lens array is formed at time T2, the third electrode of the second electrode pair applies the first voltage, the fourth electrode applies the second voltage, and the first electrode pair serves as the common electrode.
In another aspect, an embodiment of the present invention further provides an imaging method, including:
imaging a target object in a specified scene through the main lens;
judging the distance between the target object and the liquid crystal lens array device;
when the target object is close to the liquid crystal lens array device, the liquid crystal lens array device works under positive focal power, at the time of T1, the first voltage in the first electrode pair is larger than the second voltage, the second electrode pair serves as a common electrode, and a first image is generated according to the imaging; at time T2, the first voltage is greater than the second voltage in the second electrode pair, the first electrode pair serves as a common electrode, and a second image is generated according to the imaging;
when the target object is far away from the liquid crystal lens array device, the liquid crystal lens array device works under negative focal power, at the time of T1, the first voltage in the first electrode pair is smaller than the second voltage, the second electrode pair serves as a common electrode, and a third image is generated according to the imaging; at time T2, the first voltage in the second electrode pair is smaller than the second voltage, the first electrode pair serves as a common electrode, and a fourth image is generated according to the imaging;
and carrying out image splicing processing on the first image and the second image to generate a first target image, or carrying out image splicing processing on the third image and the fourth image to generate a second target image.
In summary, according to the liquid crystal lens array device, the imaging apparatus and the imaging method provided by the invention, the projection of the first electrode pair of the first array electrode on the reference plane is partially overlapped with the second electrode pair of the second array electrode, and the first electrode pair and the second electrode pair are respectively driven at the time T1 and the time T2, so that the duty ratio of the liquid crystal lens array device can be ensured to reach 100% under a simple process, and the problem that the imaging quality of an image is influenced by reducing the distance between liquid crystal lenses when the aperture ratio of the liquid crystal lens array is increased is fully solved. The imaging device and the imaging method improve the duty ratio of the liquid crystal lens array, have higher aperture opening ratio and can improve the imaging quality when the liquid crystal lens array is used.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a liquid crystal lens array device according to a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram showing a first electrode pair of the liquid crystal lens array device according to the first embodiment of the present invention.
Fig. 3 is a schematic diagram showing an arrangement of a plurality of first electrode pairs and second electrode pairs of the liquid crystal lens array device according to the first embodiment of the present invention.
Fig. 4 is a schematic diagram showing an arrangement of a plurality of first electrode pairs and second electrode pairs of the liquid crystal lens array device according to the second embodiment of the present invention.
Fig. 5 is a schematic structural view showing a liquid crystal lens array device according to a second embodiment of the present invention.
Fig. 6 is a schematic structural diagram showing a liquid crystal lens array device according to a third embodiment of the present invention.
Fig. 7 is a schematic diagram showing a deformed structure of a liquid crystal lens array device according to a third embodiment of the present invention. .
Fig. 8 is a schematic structural view showing a liquid crystal lens array device according to a fourth embodiment of the present invention.
Fig. 9 shows a flowchart of an imaging method according to a sixth embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 other identical elements in a process, method, article, or apparatus that comprises the element.
Example 1
Referring to fig. 1 and 2 and fig. 3, an embodiment of the invention provides a liquid crystal lens array device, which sequentially includes: a first substrate 10, a first array electrode 20, a first alignment layer 30, a liquid crystal layer 40, a second alignment layer 50, a second array electrode 60, and a second substrate 70. Wherein the first substrate 10 and the second substrate 70 are preferably glass substrates. As shown in fig. 2, the first array electrode 20 includes a plurality of first electrode pairs 20, and the first electrode pairs 20 have a ring shape and include first electrodes 21 and second electrodes 22. Similarly, the second array electrode 60 includes a plurality of second electrode pairs 60, and the second electrode pairs 60 are similar to the first electrode pairs in shape and also have a ring shape, and include a third electrode and a fourth electrode. Wherein the projection of the first electrode pairs of the first array electrode 20 onto a reference plane parallel to the plane of the liquid crystal layer 40 (the plane of the liquid crystal layer 40 is parallel to the first substrate or the second substrate) partially overlaps the second electrode pairs of the second array electrode 60. When the first liquid crystal lens array is formed at time T1, a first voltage is applied to the first electrode, a second voltage is applied to the second electrode, the second electrode pair 60 is used as a common electrode, so that the second electrode pair 60 is used as a common voltage and has the same potential, and after the first electrode and the second electrode of each first electrode pair 20 are applied with voltages, liquid crystal molecules of the liquid crystal layer are driven to deflect to form a liquid crystal lens with refractive index gradient difference by using the voltage difference between the first electrode and the second electrode, so that a plurality of liquid crystal lenses arranged in an array are formed at the same time. When the second liquid crystal lens array is formed at the time T2, a first voltage is applied to the third electrode of the second electrode pair, a second voltage is applied to the fourth electrode, the first electrode pair 20 is used as a common electrode, the first electrode pair 20 generates a common voltage, a voltage difference is generated between the third electrode and the fourth electrode of each second electrode pair, liquid crystal molecules of the liquid crystal layer are driven to deflect to form a liquid crystal lens with a refractive index gradient difference, and thus a plurality of liquid crystal lenses arranged in an array are formed at the same time. Since the driving is divided into the time T1 and the time T2, and the projection of the first electrode pair of the first array electrode 20 on the reference plane is partially overlapped with the second electrode pair of the second array electrode 60, the lens formed by time division can greatly improve the duty ratio of the liquid crystal lens array, improve the aperture ratio of the liquid crystal lens array device, and obtain better image quality.
Further, a first predetermined distance is formed between two adjacent first electrode pairs 20 of the first array electrode, and a second predetermined distance is formed between two adjacent second electrode pairs of the second array electrode. Preferably, the first predetermined distance is greater than or equal to 0.1 times the circular aperture of the first electrode pair, for example, the circular aperture is 1mm, and the interval between two adjacent first electrode pairs 20, or the first predetermined distance, is greater than or equal to 0.1 mm. Similarly, the second preset distance is larger than or equal to 0.1 time of the circular aperture of the second electrode pair, so that the aperture opening ratio and the imaging quality can be ensured, the size of the liquid crystal lens array device cannot be overlarge, and the liquid crystal material is reduced. As shown in fig. 3, the solid circles a1, a2, a3, a4, c1, c2, c3 and c4 represent a first electrode pair, respectively, the first electrode pairs a1, a2, a3 and a4 of the first row are spaced apart from each other, the first electrode pairs c1, c2, c3 and c4 of the third row are spaced apart from each other, and the first electrode pairs of the first row are also spaced apart from the first electrode pairs of the third row. Dashed circles b1, b2, b3, b4, d1, d2, d3 and d4 in the figure represent a second electrode pair, respectively. Also at a distance from each other, as before for the first electrode pair. It is worth mentioning that the first electrode pair and the second electrode pair partially overlap (as seen in the projection on the aforementioned reference plane), and since there is a certain distance between them, only a small portion of the gap between the two adjacent first electrode pairs and the two corresponding adjacent second electrode pairs is not fully utilized, i.e. the aperture ratio is close to 100%.
That is, in the embodiment of the present invention, an electrode pattern is applied to the glass substrate of the common electrode (usually, the planar electrode) of the conventional liquid crystal lens array, the pattern is the same as the driving electrode on the other glass substrate, but the projections of the electrode arrangement positions on the two substrates on the reference plane are staggered with each other. The staggered arrangement fills the gap between the single-layer liquid crystal lens and the liquid crystal lens by working at different time, and has higher duty ratio (or aperture ratio).
Example 2
Referring to fig. 4 and 5, the liquid crystal lens array device of the second embodiment of the present invention is mainly different from the liquid crystal lens array device of the first embodiment of the present invention in that: two adjacent first electrode pairs of the first array electrodes on the first substrate are tangent, and two adjacent second electrode pairs of the second array electrodes on the second substrate are tangent. Referring to fig. 4 and 5, taking the first array electrode as an example, any two adjacent first electrode pairs, such as a1 and a2, of the first electrode pairs a1, a2, a3 and a4 in the shape of a ring in the first row are tangent to each other, and a1 is also tangent to c1 of the second electrode pairs c1, c2, c3 and c4 in the shape of a ring in the adjacent second row, that is, each annular first electrode pair is tangent to the adjacent annular first electrode pair. And the second array electrodes on the second substrate are partially overlapped with the projection of the array electrodes on the first substrate on the reference plane, so that two adjacent second electrode pairs of the second array electrodes are tangent like two adjacent first electrode pairs of the first substrate, as well as between two adjacent second electrode pairs of the second electrode pairs d1, d2, d3 and d4 in the last row in the figure and between adjacent second electrode pairs of the last row. Therefore, when the two adjacent first electrode pairs and the two corresponding adjacent second electrode pairs work in a time-sharing mode, no gap is left, namely the opening ratio reaches 100%. In addition, preferably, the first electrode is in the shape of a ring for the second electrode pair, and the diameter sizes of the two electrodes are the same. Therefore, the first electrode pair and the second electrode pair are conveniently prepared on the first substrate, and the problem that the opening ratio can be improved only by ensuring how to arrange the whole first array electrode and the second array electrode on the process design is not needed to be considered too much. During manufacturing, only after the first electrode pairs on the first substrate are arranged, the second electrode pairs on the second substrate only need to be subjected to small offset design, and partial overlapping of projections of the first electrode pairs and the second electrode pairs on the reference plane can be guaranteed. Taking fig. 4 as an example, the centers of the first electrode pair and the second electrode pair are all on the same straight line, that is, in the following fig. 4, the center of the dotted line circle and the center of the solid line circle are on the same inclined straight line, the overlapping area of the single circular ring-shaped first electrode pair on the first substrate and the single circular ring-shaped second electrode pair on the second substrate is 18.1%, that is, the overlapping area of the two circular ring-shaped electrode pairs is 18.1%, the total of four overlapping areas is 72.4%, and the middle blank area is 1-72.4%, which is 27.6%.
Further, in the second embodiment of the present invention, since two adjacent first electrode pairs are tangent and two adjacent second electrode pairs are tangent, in order to achieve higher imaging quality and avoid interference between adjacent liquid crystal lenses at this time, the time T1 includes: at times t1 and t2, adjacent first electrode pairs operate as drive electrodes at times t1 and t2, respectively, and second electrode pairs operate as common electrodes; the time T2 includes: at times t3 and t4, adjacent pairs of first electrodes operate as drive electrodes at times t3 and t4, respectively. Of course, as a modified example of the second embodiment of the present invention, the time t1, the time t2, the time t3 and the time t4 may be interspersed in the order t1 → t2 → t3 → t4, where the time t1 is followed by the time t3, and the time t2 is followed by the time t4, that is, the time t1 → t3 → t2 → t 4. That is, four divided timings, when the liquid crystal lens array is operated, taking two rows as an example, when the first electrode pair a1, a3 of the first row on the first substrate and the first electrode pair c2, c4 of the second row adjacent to the first row (respectively on the diagonally opposite side of a1 and the diagonally opposite side of a 3) are operated as driving electrodes at time t1, and a2, a4 and c1, c3 are not operated at this time; at time t2, a2, a4, c1 and c3 operate as driving electrodes, and a1, a3, c2 and c4 do not operate; the same applies to the time t3 and the time t4, and at the time t3, b1, b3, d2 and d4 operate as drive electrodes, while b2, b4, d1 and d3 do not operate; at time t4, b1, b3, d2 and d4 do not operate, and b2, b4, d1 and d3 operate as drive electrodes. The sequence of the times t1, t2, t3 and t4 can be arbitrarily arranged. These are within the scope of the embodiments of the invention.
Further, a first electrode and a second electrode of the first electrode pair are located on a first plane, and the second electrode is located in the first electrode; the third electrode and the fourth electrode of the second electrode pair are located in a second plane, and the third electrode is located within the fourth electrode.
Further, when the first liquid crystal lens array is formed at time T1, a voltage difference within a first predetermined range is formed between the third electrode and the fourth electrode of the second electrode pair, so that the second electrode pair serves as a common electrode and the first electrode pair serves as a driving electrode; when the second liquid crystal lens array is formed at time T2, a voltage difference within a second predetermined range is formed between the first electrode and the second electrode of the first electrode pair so that the first electrode pair serves as a common electrode and the second electrode pair serves as a driving electrode. The first predetermined range of voltage difference and the second predetermined range of voltage difference are determined according to the medium between the first array electrode 20 and the first alignment layer 30 and between the second array electrode 60 and the second alignment layer 50, respectively. If the medium is a high impedance film, the first predetermined range and the second predetermined range are between plus or minus 10V. If the high-resistance film is not available, white glass exists in the structure, and the first preset range and the second preset range are between plus or minus 100V. The above voltage ranges are root mean square values of the voltages.
From the cross-sectional view of fig. 5, it can be seen that, since the adjacent first electrode pairs of the first array electrode 20 are tangent and the adjacent second electrode pairs of the second array electrode are tangent, the cross-section of the whole first electrode pair is a black line. The section of the whole second electrode pair is also in a black line shape.
Example 3
Referring to fig. 6, the main differences between the third embodiment of the present invention and the first embodiment of the present invention are: in the third embodiment of the present invention, a first transparent glass substrate (also called white glass) 80 is additionally disposed between the first array electrode 20 and the first alignment layer 30, and a second transparent glass substrate 90 is additionally disposed between the second array electrode 60 and the second alignment layer 50. Through setting up first transparent glass substrate 80 and second transparent glass substrate 90, can be so that when exerting voltage to first array electrode and second array electrode, can form inhomogeneous electric field distribution better, be favorable to forming gradient refractive index electric field distribution to liquid crystal lens effect has been promoted. The first transparent glass substrate and the second transparent glass substrate can be made of common glass, and the refractive index and the insulativity of the glass are utilized, so that the cost of the liquid crystal lens array device cannot be increased while the uneven distribution of a formed electric field is facilitated, the lens effect is improved, and the image display quality is improved.
Referring to fig. 7, in a modified embodiment of the third embodiment of the present invention, a first electrode pair of the first array electrode 20 and a second electrode pair of the second array electrode 60 are modified. The first electrode and the second electrode of the first electrode pair 20 are not in the same plane, and the projection of the first electrode on the reference plane is located within the projection of the second electrode on the reference plane; the third and fourth electrodes of the second electrode pair 60 are not in the same plane, and the projection of the third electrode onto the reference plane is located within the projection of the fourth electrode onto the reference plane. Specifically, the first electrode pair includes: a first common electrode 20a, a first driving electrode 20c, and a first spacer 20b between the first common electrode 20a and the first driving electrode 20c, wherein the first driving electrode 20c is disposed adjacent to the first transparent glass substrate 80, and the first common electrode 20a is disposed adjacent to the first substrate 10.
Example 4
Referring to fig. 8, the liquid crystal lens array device of the fourth embodiment of the invention is mainly different from the liquid crystal lens array device of the third embodiment of the invention in that: a first insulating layer 81 and a first high-resistance film 82 are disposed between the first array electrode 20 and the first alignment layer 30, wherein the first insulating layer 81 is attached to the first array electrode 20, and the first high-resistance film 82 is attached to the first alignment layer 30. A second insulating layer 91 and a second high resistance film 92 are disposed between the second array electrode 60 and the second alignment layer 50. The second high resistance film 92 is provided by being disposed at a side where the first high resistance film 82 and the second array electrode 60 are disposed at a side of the first array electrode 20. Compared with the prior art which only uses a single-side high-resistance film, the film has the following advantages: 1) in the prior art, when the high-impedance film is arranged on one side, because the common electrode is arranged on one substrate and the driving electrode is arranged on the other substrate of the two substrates oppositely arranged in the liquid crystal lens array device, the problem that the electrodes on the two substrates need to be driven in a time-sharing manner to be alternately used as the driving electrodes to respectively form the liquid crystal lenses is solved, and the voltage driving control is not complicated, but in the embodiment of the invention, if the high-impedance film is arranged on one side, the voltage control is more complicated: if only the first high-resistance film is provided on the first substrate and the second high-resistance film is not provided on the second substrate, a low voltage is required when the first electrode pair of the first substrate operates as a driving electrode; when the second electrode pair of the second substrate works as a driving electrode, high voltage is required, so that complicated calculation processing is required in voltage control to achieve the purpose of the invention. In addition, after the first high-resistance film and the second high-resistance film are respectively and correspondingly arranged on the first substrate and the second substrate, the thickness of the liquid crystal lens array device can be further reduced instead of the first transparent glass substrate (white glass) and the second transparent glass substrate in the third embodiment of the invention, so that the miniaturization of the device and the light weight of the mounted equipment are facilitated. In addition, the structure can be symmetrical, when the first electrode pair and the second electrode pair are respectively used as driving electrodes in use, the effect of the liquid crystal lens can be realized only by low voltage, and the aperture opening ratio reaches 100%.
Example 5
An embodiment of the present invention further provides an imaging apparatus, where the imaging apparatus at least includes: a main lens and an image sensor, and a liquid crystal lens array device disposed between the main lens and the image sensor. The liquid crystal lens array device is the liquid crystal lens array device described in embodiments 1 to 4, and please refer to the description of embodiments 1 to 4 for details, which will not be described herein again.
Example 6
Referring to fig. 9, based on the imaging apparatus in the fifth embodiment of the present invention, the present invention further provides an imaging method, including:
s10, imaging a target object in the appointed scene through the main lens;
s20, judging the distance between the target object and the liquid crystal lens array device;
s30, when the target object is close to the liquid crystal lens array device, the liquid crystal lens array device works under positive focal power, at the time of T1, the first voltage in the first electrode pair is larger than the second voltage, the second electrode pair serves as a common electrode, and a first image is generated according to the imaging; at time T2, the first voltage is greater than the second voltage in the second electrode pair, the first electrode pair serves as a common electrode, and a second image is generated according to the imaging; it should be noted that the farther and closer positions in the present embodiment are determined by taking the focused position of the main lens as a boundary when the liquid crystal lens array device is not focused. The lens is considered to be closer when it is between the in-focus position of the main lens and the main lens, and is considered to be farther from the main lens when it is farther from the main lens side of the in-focus position of the main lens.
S40, when the target object is far away from the liquid crystal lens array device, the liquid crystal lens array device works under negative focal power, at the time of T1, the first voltage in the first electrode pair is smaller than the second voltage, the second electrode pair serves as a common electrode, and a third image is generated according to the imaging; at time T2, the first voltage in the second electrode pair is smaller than the second voltage, the first electrode pair serves as a common electrode, and a fourth image is generated according to the imaging;
s50, carrying out image splicing processing on the first image and the second image to generate a first target image; the image splicing method has various modes, and splicing can be performed based on repeated parts between two images, and a phase correlation method is adopted for splicing through a frequency domain; or time domain splicing, searching the corresponding relation between the characteristics based on the image characteristics, and then splicing into a complete image.
And S60, carrying out image splicing processing on the third image and the fourth image to generate a second target image. There are various image stitching processing manners, which can be referred to as the image stitching processing manner of the first image and the second image, and are not described herein again.
Preferably, between step S40 and step S50, further comprising: s70, displaying the first image and the second image simultaneously, or displaying the third image and the fourth image simultaneously;
further, after step S50, the method further includes: and S80, displaying the first target image or the second target image. The complete first target image or second target image of the target object can be displayed here.
In the imaging method according to the sixth embodiment of the present invention, since the imaging device according to the fifth embodiment of the present invention includes the liquid crystal lens array device described in the first to fourth embodiments of the present invention, the aperture ratio may approach or reach 100%, and the structure is simple, which is beneficial to rapidly forming a high-quality image with a low voltage.
It is to be understood that the invention is not limited to the specific arrangements and instrumentality described above and shown in the drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications and additions or change the order between the steps after comprehending the spirit of the present invention.
The functional blocks shown in the above-described structural block diagrams may be implemented as 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, plug-in, 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 by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, 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 so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
It should also be noted that the exemplary embodiments mentioned in this patent describe some methods or systems based on a series of steps or devices. However, 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, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.
As described above, only the specific embodiments of the present invention are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.
Claims (10)
1. A liquid crystal lens array device, comprising: the liquid crystal display device comprises a first array electrode, a second array electrode and a liquid crystal layer clamped between the first array electrode and the second array electrode, wherein the first array electrode comprises a plurality of first electrode pairs, the second array electrode comprises a plurality of second electrode pairs, the projection of the first electrode pairs of the first array electrode on a reference plane is partially overlapped with the second electrode pairs of the second array electrode, the reference plane is parallel to the plane of the liquid crystal layer, the first electrode pairs comprise a first electrode and a second electrode, the second electrode pairs comprise a third electrode and a fourth electrode, when a first liquid crystal lens array is formed at the time T1, a first voltage is applied to the first electrode, a second voltage is applied to the second electrode, and the second electrode pairs serve as a common electrode; when the second liquid crystal lens array is formed at time T2, a first voltage is applied to the third electrode and a second voltage is applied to the fourth electrode of the second electrode pair, and the first electrode pair serves as a common electrode.
2. The device of claim 1, wherein two adjacent first electrode pairs of the first array electrodes are spaced apart by a first predetermined distance, and two adjacent second electrode pairs of the second array electrodes are spaced apart by a second predetermined distance.
3. The device of claim 1, wherein two adjacent first electrode pairs of the first array electrodes are tangent and two adjacent second electrode pairs of the second array electrodes are tangent.
4. The lc lens array device of claim 3, wherein said time T1 comprises: at the time t1 and the time t2, the adjacent first electrode pairs respectively work at the time t1 and the time t 2; the time T2 includes: at times t3 and t4, adjacent first electrode pairs are operating at times t3 and t4, respectively.
5. The device of claim 1, wherein the first electrode and the second electrode of the first electrode pair lie in a first plane, the second electrode lying within the first electrode; the third electrode and the fourth electrode of the second electrode pair are located in a second plane, and the third electrode is located within the fourth electrode.
6. The device according to any one of claims 1 to 5, wherein the first electrode and the second electrode of a first electrode pair are not in the same plane, and the projection of the first electrode on the reference plane is located within the projection of the second electrode on the reference plane; the third electrode and the fourth electrode of the second electrode pair are not in the same plane, and the projection of the third electrode on the reference plane is positioned in the projection of the fourth electrode on the reference plane.
7. The device of claim 6, wherein when the first liquid crystal lens array is formed at time T1, a voltage difference within a first predetermined range is formed between the third electrode and the fourth electrode of the second electrode pair, such that the second electrode pair acts as a common electrode; when the second liquid crystal lens array is formed at time T2, a voltage difference within a second predetermined range is formed between the first electrode and the second electrode of the first electrode pair so that the first electrode pair serves as a common electrode.
8. The device of claim 1, wherein a first high resistance film or a first transparent glass substrate is disposed between the first array electrode and the liquid crystal layer, and a second high resistance film or a second transparent glass substrate is disposed between the second array electrode and the liquid crystal layer.
9. An imaging apparatus comprising a main lens and an image sensor, characterized by further comprising: a liquid crystal lens array device according to any one of claims 1 to 8 provided between the main lens and the image sensor.
10. An imaging method based on the imaging apparatus according to claim 9, characterized in that the imaging method comprises:
imaging a target object in a specified scene through the main lens;
judging the distance between the target object and the liquid crystal lens array device;
when the target object is close to the liquid crystal lens array device, the liquid crystal lens array device works under positive focal power, at the time of T1, the first voltage in the first electrode pair is larger than the second voltage, the second electrode pair serves as a common electrode, and a first image is generated according to the imaging; at time T2, the first voltage is greater than the second voltage in the second electrode pair, the first electrode pair serves as a common electrode, and a second image is generated according to the imaging;
when the target object is far away from the liquid crystal lens array device, the liquid crystal lens array device works under negative focal power, at the time of T1, the first voltage in the first electrode pair is smaller than the second voltage, the second electrode pair serves as a common electrode, and a third image is generated according to the imaging; at time T2, the first voltage in the second electrode pair is smaller than the second voltage, the first electrode pair serves as a common electrode, and a fourth image is generated according to the imaging;
and carrying out image splicing processing on the first image and the second image to generate a first target image, or carrying out image splicing processing on the third image and the fourth image to generate a second target image.
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| CN110865472B (en) | 2021-05-25 |
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