Liquid crystal lens, driving method of liquid crystal lens and electronic product

Abstract

The invention belongs to the technical field of optics, and particularly relates to a liquid crystal lens, a driving method of the liquid crystal lens and an electronic product. The liquid crystal lens comprises a first substrate, a first pattern electrode, a high-impedance film, a first orientation layer, a liquid crystal layer, a second orientation layer, a second pattern electrode and a second substrate which are sequentially stacked, the first pattern electrode comprises two first rectangular electrodes and a plurality of second rectangular electrodes, the two first rectangular electrodes and the plurality of second rectangular electrodes are the same in length, the plurality of second rectangular electrodes are rotationally arranged along the same set center, the two first rectangular electrodes are respectively arranged on two sides of a reference plane in parallel, and the two second rectangular electrodes are respectively arranged on two sides of the reference plane in parallel. The ends, located on one side of the reference plane, of the two first rectangular electrodes and the second rectangular electrodes are loaded with first driving voltage V1, and the ends, located on the other side of the reference plane, of the two first rectangular electrodes and the second rectangular electrodes are loaded with second driving voltage V2. Diffraction can be reduced, and voltage jump can be effectively avoided.

Description

Technical Field

[0001] The present invention belongs to the field of optical technology, and in particular relates to a liquid crystal lens, a driving method of the liquid crystal lens and an electronic product. Background Art

[0002] Liquid crystal lenses can change the focal length through electric field regulation, and have the advantages of fast response speed, small size and easy integration. Based on these excellent properties, liquid crystal lenses have been widely used in projection display, focusing and energy collection, lighting optics, and small imaging systems. The structure of liquid crystal lenses is generally divided into two types. The first type was first proposed by Sato in the literature Liquid-crystal lens-cells with variable focal length. It changes the shape of the liquid crystal layer to give it a lens effect, and then modulates the refractive index of the liquid crystal layer by voltage to change the focal length of the lens, such as Figure 1 As shown. The second method is to use electrodes to regulate the voltage in different regions of the liquid crystal layer to achieve phase modulation. Kotava proposed a modal control liquid crystal lens structure in 2015. The upper and lower electrode surfaces are driven by alternating current to generate a near-parabolic voltage, such as Figure 2 As shown in Figure 1. Although this lens has good imaging effect, the finished lens is relatively unstable because the electrode surface needs to use high-resistance film material. Galstian proposed to use serpentine ITO electrode to replace high-resistance film to achieve mode control in the literature Electrically tunable liquid crystal lens with a serpentine electrode design. The structure is shown in Figure 1. Figure 3 As shown. Algorri also proposed a similar structure in the literature A high birefringence liquid crystal for lenses with large aperture. In this structure, a single electrode realizes the lens voltage distribution, and then concentric rings are designed to distribute the voltage into a circle, as shown Figure 4 However, the ITO electrodes in the lens area of ​​these two structures will produce a more obvious diffraction effect, and the voltage distribution in the area not covered by the electrode will jump, which makes the imaging effect of the lens not ideal. Summary of the invention

[0003] In view of this, the present invention provides a liquid crystal lens, a driving method of the liquid crystal lens and an electronic product, which are used to solve the technical problems that the ITO electrode in the existing liquid crystal lens will produce a more obvious diffraction effect and the voltage distribution in the area not covered by the electrode will jump.

[0004] In a first aspect, the present invention provides a liquid crystal lens, comprising a first substrate, a first pattern electrode, a high impedance film, a first alignment layer, a liquid crystal layer, a second alignment layer, a second pattern electrode and a second substrate stacked in sequence;

[0005] The first pattern electrode includes two first rectangular electrodes and a plurality of second rectangular electrodes, the two first rectangular electrodes and the plurality of second rectangular electrodes have the same length, the plurality of second rectangular electrodes are arranged in rotation along the same set center, the two first rectangular electrodes are respectively arranged in parallel on both sides of the reference plane, the two first rectangular electrodes and each second rectangular electrode are loaded with a first driving voltage V1 at the end on one side of the reference plane, and a second driving voltage V2 at the end on the other side, the reference plane is a plane passing through the set center and perpendicular to the plane where the first pattern electrode is located, and Where V represents the AC voltage amplitude, f represents the voltage frequency, Indicates the voltage phase.

[0006] Preferably, a spacer is further provided between the first alignment layer and the second alignment layer.

[0007] Preferably, the first rectangular electrode and the second rectangular electrode are transparent electrodes.

[0008] Preferably, the first substrate and the second substrate are transparent substrates.

[0009] Preferably, the second pattern electrode is a planar electrode.

[0010] Preferably, the second pattern electrode includes a plurality of electrode units with the same center position, and the plurality of electrode units are arranged in sequence from the center position of the second pattern electrode toward the edge position of the second pattern electrode, wherein the electrode unit at the center is circular, and the remaining electrode units are ring-shaped, and the line connecting the center position of the second pattern electrode and the set center is perpendicular to the first pattern electrode.

[0011] Preferably, the electrode unit is divided into two sub-units by the reference plane.

[0012] In a second aspect, the present invention provides a method for driving a liquid crystal lens, for driving the liquid crystal lens described in the first aspect, the method comprising:

[0013] S1: obtaining the liquid crystal linear working range of the liquid crystal lens;

[0014] S2: acquiring a minimum voltage Vmin and a maximum voltage Vmax within the liquid crystal linear working interval according to the liquid crystal linear working interval;

[0015] S3: Determine the voltage phase according to the minimum voltage Vmin and the maximum voltage Vmax Target adjustment range;

[0016] S4: According to the adjustment range, a first driving voltage V1 is loaded on the ends of the first rectangular electrode and the second rectangular electrode on one side of the reference plane, and a second driving voltage V2 is loaded on the ends on the other side, and a voltage phase of the loaded driving voltage is within the target adjustment range.

[0017] In a third aspect, the present invention provides a method for driving a liquid crystal lens, for driving the liquid crystal lens according to the first aspect, the method comprising:

[0018] S01: obtaining a liquid crystal linear working range of a liquid crystal lens;

[0019] S02: acquiring a minimum voltage Vmin and a maximum voltage Vmax within the liquid crystal linear working interval according to the liquid crystal linear working interval;

[0020] S03: Determine the voltage phase according to the minimum voltage Vmin and the maximum voltage Vmax Target adjustment range;

[0021] S04: according to the adjustment range, a first driving voltage V1 is applied to the ends of the first rectangular electrode and the second rectangular electrode located on one side of the reference plane, and a second driving voltage V2 is applied to the ends on the other side, wherein the voltage phases of the applied driving voltages are within the target adjustment range;

[0022] S05: Applying a driving voltage to each electrode unit according to the position of each electrode unit in the second pattern electrode, wherein the driving voltage of the i-th electrode unit is

[0023] In a fourth aspect, the present invention provides an electronic product, comprising a control circuit and a liquid crystal lens as described in any one of claims 1 to 7, wherein the control circuit is electrically connected to the liquid crystal lens.

[0024] Beneficial effects: The liquid crystal lens, the driving method of the liquid crystal lens and the electronic product of the present invention adopt a structure in which a plurality of rectangular electrodes are arranged in rotation around a set center, and each rectangular electrode is formed into a parabolic distribution by applying a driving voltage to both ends of the rectangular electrode, so that a rotationally symmetrical parabolic potential distribution can be formed under the joint action of all rectangular electrodes. In addition, the potential distribution in the functional area of ​​the lens is smoother through the high impedance film, and since the liquid crystal lens of the present invention does not produce obvious diffraction and jump, its optical performance is more excellent. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the embodiment of the present invention will be briefly introduced below. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work, and these are all within the protection scope of the present invention.

[0026] Figure 1 It is a schematic diagram of the structure of the liquid crystal lens proposed by Sato in the prior art;

[0027] Figure 2 It is a structural schematic diagram of a mode-controlled liquid crystal lens proposed by Kotava in the prior art;

[0028] Figure 3 It is a schematic diagram of the structure of a liquid crystal lens that uses a serpentine ITO electrode to replace a high-resistance film to achieve modal control in the prior art;

[0029] Figure 4 A schematic diagram of the structure of a liquid crystal lens that uses a single electrode to achieve lens voltage distribution in the prior art and then designs concentric rings to distribute the voltage into a circle;

[0030] Figure 5 is a cross-sectional view of the liquid crystal lens used in the present invention;

[0031] Figure 6 is a schematic structural diagram of the first pattern electrode in the present invention;

[0032] Figure 7 It is a schematic diagram of the structure of a single rectangular electrode in the present invention;

[0033] Figure 8 is a structural schematic diagram of a second pattern electrode in the present invention;

[0034] Fig. 9 It is a schematic diagram of a flow chart of a liquid crystal lens driving method in the present invention;

[0035] Fig.10 It is a schematic diagram of the linear working range of the liquid crystal lens;

[0036] Fig.11 is a fitting curve diagram of the potential distribution of the liquid crystal layer under different driving voltages;

[0037] Fig.12 is a voltage distribution diagram in the liquid crystal layer of the liquid crystal lens of the present invention;

[0038] Fig.13 is an interference fringe pattern of the liquid crystal lens of the present invention;

[0039] Fig.14 is a schematic flow chart of another liquid crystal lens driving method in the present invention;

[0040] Fig.15 is a schematic diagram of the effective potential of the first pattern electrode and the effective voltage of the liquid crystal layer of the present invention;

[0041] Fig.16 It is a voltage distribution diagram of the Fresnel liquid crystal lens of the present invention.

[0042] Parts and their numbers in the picture:

[0043] The first substrate 1 , the first pattern electrode 2 , the first rectangular electrode 21 , the second rectangular electrode 22 , the high-resistance film 3 , the first alignment layer 4 , the liquid crystal layer 5 , the spacer 6 , the second alignment layer 7 , the second pattern electrode 8 , and the second substrate 9 . DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described in combination with the embodiment of the present invention. It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. In the absence of further restrictions, the elements defined by the phrase "comprising..." do not exclude the existence of other identical elements in the process, method, article or device comprising the elements. If there is no conflict, the embodiments of the present invention and the various features in the embodiments can be combined with each other, all within the protection scope of the present invention.

[0045] Example 1

[0046] like Figure 5 As shown, this embodiment provides a liquid crystal lens, which includes a first substrate 1, a first pattern electrode 2, a high impedance film 3, a first alignment layer 4, a liquid crystal layer 5, a second alignment layer 7, a second pattern electrode 8 and a second substrate 9 which are stacked in sequence;

[0047] like Figure 6 As shown, the first pattern electrode 2 includes two first rectangular electrodes 21 and a plurality of second rectangular electrodes 22, the two first rectangular electrodes 21 and the plurality of second rectangular electrodes 22 have the same length, and the plurality of second rectangular electrodes 22 are arranged in rotation along the same set center, the two first rectangular electrodes 21 are respectively arranged in parallel on both sides of the reference plane, the two first rectangular electrodes 21 and each second rectangular electrode 22 are loaded with a first driving voltage V1 at the end on one side of the reference plane, and a second driving voltage V2 at the end on the other side, and the reference plane is a plane passing through the set center and perpendicular to the plane where the first pattern electrode 2 is located, and Where V represents the AC voltage amplitude, f represents the voltage frequency, Indicates the voltage phase.

[0048] Among the second rectangular electrodes 22, any second rectangular electrode 22 can be obtained by rotating any other second rectangular electrode 22 along the set center at a certain angle. The angles between the second rectangular electrodes 22 can be equal or unequal, and there is no limitation here. These second rectangular electrodes 22 intersect at the same point, which is the aforementioned set center. Both the first rectangular electrode 21 and the second rectangular electrode 22 have two opposite endpoints. In this embodiment, the first pattern electrode 2 is divided into two parts based on the reference plane. For the convenience of description, one part is the first part and the other part is the second part. The endpoints of the first rectangular electrode 21 and the second rectangular electrode 22 located in the first part are loaded with the first driving voltage, and the endpoints located in the second part are loaded with the second driving voltage. The first driving voltage and the second driving voltage have the same amplitude, the same frequency, and a phase difference. Wherein, the second pattern electrode is a planar electrode and can be used as a ground plane.

[0049] Each rectangular electrode of the first pattern electrode 2 can generate a nearly parabolic potential distribution under the drive of the sinusoidal alternating current. The first driving voltage V1 and the second driving voltage V2 can be expressed as:

[0050]

[0051] The effective value of the potential can be expressed as:

[0052] Where T is the integration time.

[0053] Normalize the coordinates of a single electrode, such as Figure 7 As shown, Figure 7 0 represents the preset center position, -1 and +1 represent the two end positions of the electrode respectively. Then the effective value of the potential distribution on a single electrode is V upIt can be expressed as:

[0054]

[0055] Since a single electrode can generate a parabolic potential distribution under the drive of the first driving voltage and the second driving voltage, and the plurality of second rectangular electrodes 22 are rotated and distributed along the same center point, they have a parabolic potential distribution at all angles. These electrodes, combined with the high impedance film 3, can smoothly distribute the potential in the lens area to obtain a rotationally symmetrical parabolic potential distribution. When the driving voltage is within the linear working range of the liquid crystal, the rotationally symmetrical parabolic potential distribution makes the refractive index of the liquid crystal layer 5 parabolically distributed. Therefore, the electrode structure in this embodiment can not only obtain a liquid crystal lens with a parabolic refractive index distribution of the liquid crystal layer 5, but also does not produce a significant diffraction effect, so the optical effect of the lens is more excellent.

[0056] In order to better support the liquid crystal layer 5, in this embodiment, a spacer 6 is further arranged between the first alignment layer 4 and the second alignment layer 7. The spacer 6 can be arranged at the edge of the liquid crystal layer 5 to keep the shape of the liquid crystal layer 5 stable.

[0057] In this embodiment, the first rectangular electrode 21 and the second rectangular electrode 22 are also set as transparent electrodes. After the transparent electrodes are used, light can pass through the electrodes without being blocked, thereby improving the optical effect of the liquid crystal lens. The materials of the transparent electrodes include but are not limited to ITO electrode materials, FTO electrode materials, AZO electrode materials, IGZO electrode materials, IZO electrode materials, etc.

[0058] In this embodiment, the first substrate 1 and the second substrate 9 can be made of a transparent material with certain strength and rigidity, such as a glass substrate, a plastic substrate, etc. The first substrate 1 and the second substrate 9 can play a role in supporting the liquid crystal lens. The first substrate 1 can be used as a carrier of the first pattern electrode 2, and the first pattern electrode 2 can be plated on the first substrate 1. The second substrate 9 also plays a supporting role and can also be used as a carrier of the second pattern electrode 8, and the second pattern electrode 8 can be plated on the second substrate 9.

[0059] In this embodiment, the first substrate 1 and the second substrate 9 are transparent substrates, which can increase the light transmittance and thus improve the optical performance of the liquid crystal lens.

[0060] Example 2

[0061] This embodiment is further improved on the basis of the above-mentioned liquid crystal lens, and a Fresnel-type liquid crystal lens can also be obtained. For this type of liquid crystal lens, the second pattern electrode 8 includes a plurality of electrode units with the same center position, and the plurality of electrode units are arranged in sequence from the center position of the second pattern electrode 8 toward the edge position of the second pattern electrode 8, wherein the electrode unit at the center is circular, and the remaining electrode units are ring-shaped. The line connecting the center position of the second pattern electrode 8 and the set center is perpendicular to the first pattern electrode 2.

[0062] Among them, the Fresnel lens is based on the principle that the curvature of the optical surface determines the imaging characteristics in optical imaging. In the design of the optical lens, the surface curvature is kept unchanged, but the thickness of the surface is reduced during the processing. The lens designed in this way can still converge light and focus the light incident on its surface to the focal point.

[0063] In the actual processing and application of the lens, the spherical lens can be regarded as a number of discontinuous parts, and the redundant parts between the parts are removed, but the original curvature of the surface is kept unchanged during the processing, and the deflection of the light is not affected. The functions of the aforementioned several discontinuous parts are realized by the central circle and a series of concentric rings on the Fresnel lens in this embodiment. This embodiment uses the deflection of the liquid crystal layer 5 under the action of the electric field to realize the functions of the concentric rings of the Fresnel lens, so as to use the liquid crystal lens to achieve an optical effect equivalent to that of the Fresnel lens.

[0064] In this embodiment, the radius of each electrode unit is the same as the radius of the corresponding Fresnel ring zone. Assume that the radius of the i-th electrode unit from the center to the edge of the second pattern electrode is r i , where r0 is the radius of the electrode unit at the center (the first electrode unit), then Wherein i is a positive integer greater than or equal to 1, and the larger the value of i is, the closer the annular zone is to the edge of the lens.

[0065] This embodiment uses the driving voltage loaded on the second pattern electrode to reduce the voltage ultimately acting on the corresponding area of ​​the liquid crystal layer, so that the voltage distribution of each area in the liquid crystal layer satisfies the voltage distribution of the Fresnel liquid crystal lens.

[0066] like Figure 8 As shown, in order to facilitate the loading of the driving voltage, the present embodiment divides the electrode unit corresponding to each Fresnel ring into two sub-units with the reference plane as the boundary. Assuming that the second pattern electrode has a total of n electrode units corresponding to the Fresnel rings, there are a total of 2n sub-units after division. Figure 8There are three Fresnel zones in one, from the center to the edge, they are the first Fresnel zone, the second Fresnel zone, and the third Fresnel zone. The first Fresnel zone is divided into two sub-units, V3 and V6, the second Fresnel zone is divided into two sub-units, V4 and V7, and the third Fresnel zone is divided into two sub-units, V5 and V8.

[0067] Example 3

[0068] like Fig. 9 As shown, this embodiment provides a method for driving a liquid crystal lens, the method is used to drive the liquid crystal lens described in Embodiment 1, and the method includes:

[0069] S1: obtaining the liquid crystal linear working range of the liquid crystal lens;

[0070] The linear operating range of the liquid crystal refers to the voltage range in which the phase delay of the liquid crystal and the driving voltage are in a linear relationship. The voltage distribution in this range determines the type of the liquid crystal lens.

[0071] For example, when the liquid crystal lens uses a liquid crystal material with a liquid crystal model of (HTW148700-100), the linear response area of ​​the liquid crystal is 1.6V rms to 2.5V rms Between, see Fig.10 shown.

[0072] S2: acquiring a minimum voltage Vmin and a maximum voltage Vmax within the liquid crystal linear working interval according to the liquid crystal linear working interval;

[0073] S3: Determine the voltage phase according to the minimum voltage Vmin and the maximum voltage Vmax The target adjustment range is: Figure 7 For a single electrode, the potential at the edge x = ±1 has a maximum value, let the maximum value be equal to 2.5V rms ,Right now According to the above formula, when the driving voltage V amplitude is 3.54V, then for the electrode center x=0,

[0074] According to the above formula, to make the central potential change within 1.6V rms to 2.5V rms , voltage phase The range of variation should be between 100.42° and 0°. Fig.11 (a) to (h) represent voltage phases The different potential distributions corresponding to changes within the target adjustment range (100.42° to 0°). Fig.11 The fitting coefficient R of all the fitted parabolas in 2At least above 0.997, which indicates that the potential distribution on the electrode line is very close to a parabolic distribution.

[0075] S4: According to the adjustment range, a first driving voltage V1 is loaded on the ends of the first rectangular electrode and the second rectangular electrode on one side of the reference plane, and a second driving voltage V2 is loaded on the ends on the other side, and a voltage phase of the loaded driving voltage is within the adjustment range.

[0076] According to the above drive mode The voltage of the liquid crystal layer is obtained as Fig.12 The actual device corresponds to Fig.11 The interference fringes of the applied voltage are as follows Fig.13 shown.

[0077] Example 4

[0078] like Fig.14 As shown, this embodiment provides a method for driving a liquid crystal lens, the method is used to drive the liquid crystal lens described in Embodiment 2, and the method includes:

[0079] S01: obtaining a liquid crystal linear working range of a liquid crystal lens;

[0080] S02: acquiring a minimum voltage Vmin and a maximum voltage Vmax within the liquid crystal linear working interval according to the liquid crystal linear working interval;

[0081] S03: Determine the voltage phase according to the minimum voltage Vmin and the maximum voltage Vmax Target adjustment range;

[0082] S04: according to the adjustment range, a first driving voltage V1 is applied to the ends of the first rectangular electrode and the second rectangular electrode located on one side of the reference plane, and a second driving voltage V2 is applied to the ends on the other side, wherein the voltage phases of the applied driving voltages are within the adjustment range;

[0083] The voltage driving method for the first pattern electrode in this embodiment is the same as that in Embodiment 3, and is used to generate a symmetrical rotational parabola potential distribution, which will not be described in detail here.

[0084] S05: Applying a driving voltage to each electrode unit according to the position of each electrode unit in the second pattern electrode, wherein the driving voltage of the i-th electrode unit is like Fig.15 As shown, in this step, the effective voltage of the liquid crystal layer is reduced by using the second pattern electrode.

[0085] Assume that the driving voltage of the i-th electrode unit from the center to the edge of the second pattern electrode is make At this time, the effective voltage of the liquid crystal layer in the area corresponding to the i-th electrode unit is expressed as:

[0086]

[0087] The potential of the upper substrate and the corresponding area of ​​the i-th electrode unit is reduced by C i , the theoretical effective voltage of the liquid crystal layer that the area corresponding to the i-th electrode unit needs to meet should be:

[0088]

[0089] According to the above two formulas, the potential of the i-th electrode unit on the upper substrate should be reduced by C i , we can make the function:

[0090]

[0091] According to the corresponding potential reduction value C of the i-th electrode unit in the second pattern electrode i The magnitude of the potential applied to the i-th electrode unit can be approximately solved as V i and Phase This method is used to calculate the potential that needs to be applied to each electrode unit in the second pattern electrode in turn, so that the liquid crystal meets the Fresnel lens voltage distribution. By solving the voltage of all regions, the voltage distribution of the liquid crystal layer can be obtained as follows: Fig.16 shown.

[0092] When each electrode unit is divided into two sub-units, the driving voltage applied to the two sub-units is equal to the driving voltage of the divided electrode unit.

[0093] V up represents the voltage of the first pattern electrode, wherein the corresponding potential reduction value C of the i-th electrode unit in the second pattern electrode i It is related to the characteristics of the Fresnel liquid crystal lens and can be determined by the following methods:

[0094] Assume that the second pattern electrode has n electrode units (corresponding to n Fresnel zones), and the potential reduction value of the first electrode unit (the electrode unit at the center) is C1, then the corresponding potential reduction value C of the i-th electrode unit is i =C1+(i-1)[V(±1)-V(0)] / n, where i is a positive integer greater than or equal to 2.

[0095] V up (±1) represents the voltage at the edge of a single electrode in the first pattern electrode, V up (0) represents the voltage at the center of a single electrode in the first pattern electrode.

[0096] Example 5

[0097] This embodiment provides an electronic product, which includes a control circuit and the liquid crystal lens described in Embodiment 1 or Embodiment 2, wherein the control circuit is electrically connected to the liquid crystal lens. The electronic product includes but is not limited to an imaging device, a display device, a mobile phone, a wearable device, and the like.

[0098] It should be clear that the present invention is not limited to the specific configuration and processing described above and shown in the figure. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiment, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present invention. The functional blocks shown in the structural block diagram described above can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, plug-in, function card, etc. When implemented in software, the elements of the present invention are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or communication link via a data signal carried in a carrier. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memories, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, and the like. The code segments can be downloaded via a computer network such as the Internet, an intranet, etc. It should also be noted that the exemplary embodiments mentioned in the present invention 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 steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0099] The above is only a specific implementation of the present invention. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the system, module and unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be covered within the protection scope of the present invention.

Claims

1. A liquid crystal lens, characterized in that: It includes a first substrate, a first pattern electrode, a high impedance film, a first alignment layer, a liquid crystal layer, a second alignment layer, a second pattern electrode and a second substrate which are stacked in sequence; The first pattern electrode includes two first rectangular electrodes and a plurality of second rectangular electrodes, the two first rectangular electrodes and the plurality of second rectangular electrodes have the same length, and the plurality of second rectangular electrodes are arranged in rotation around the same set center. The two first rectangular electrodes are respectively arranged in parallel on both sides of a reference plane, and the ends of the two first rectangular electrodes and each second rectangular electrode on one side of the reference plane are loaded with a first driving voltage V1, and the ends on the other side are loaded with a second driving voltage V2. The reference plane is a plane passing through the set center and perpendicular to the plane where the first pattern electrode is located. The first driving voltage and the second driving voltage are AC voltages with the same voltage amplitude, the same voltage frequency and different voltage phases.

2. The liquid crystal lens according to claim 1, characterized in that: The first driving voltage V1 and the second driving voltage V2 satisfy: Where V represents the AC voltage amplitude, f represents the voltage frequency, Indicates the voltage phase.

3. The liquid crystal lens according to claim 1, characterized in that: The first rectangular electrode and the second rectangular electrode are transparent electrodes.

4. The liquid crystal lens according to claim 1, characterized in that: The first substrate and the second substrate are transparent substrates.

5. The liquid crystal lens according to any one of claims 1 to 4, characterized in that: The second pattern electrode is a planar electrode.

6. The liquid crystal lens according to any one of claims 1 to 4, characterized in that: The second pattern electrode includes a plurality of electrode units having the same center position, and the plurality of electrode units are arranged in sequence from the center position of the second pattern electrode toward the edge position of the second pattern electrode, wherein the electrode unit at the center is circular, and the remaining electrode units are ring-shaped, and the line connecting the center position of the second pattern electrode and the set center is perpendicular to the first pattern electrode.

7. The liquid crystal lens according to claim 6, characterized in that: The electrode unit is divided into two sub-units by the reference plane.

8. A method for driving a liquid crystal lens, characterized in that: For driving the liquid crystal lens according to any one of claims 1 to 5, the method comprising: S1: obtaining the liquid crystal linear working range of the liquid crystal lens; S2: acquiring a minimum voltage Vmin and a maximum voltage Vmax within the liquid crystal linear working interval according to the liquid crystal linear working interval; S3: Determine the voltage phase according to the minimum voltage Vmin and the maximum voltage Vmax Target adjustment range; S4: According to the adjustment range, a first driving voltage V1 is loaded on the ends of the first rectangular electrode and the second rectangular electrode on one side of the reference plane, and a second driving voltage V2 is loaded on the ends on the other side, and a voltage phase of the loaded driving voltage is within the target adjustment range.

9. A method for driving a liquid crystal lens, characterized in that: For driving the liquid crystal lens described in claim 6 or 7, the method comprises: S01: obtaining a liquid crystal linear working range of a liquid crystal lens; S02: acquiring a minimum voltage Vmin and a maximum voltage Vmax within the liquid crystal linear working interval according to the liquid crystal linear working interval; S03: Determine the voltage phase according to the minimum voltage Vmin and the maximum voltage Vmax Target adjustment range; S04: according to the adjustment range, a first driving voltage V1 is applied to the ends of the first rectangular electrode and the second rectangular electrode located on one side of the reference plane, and a second driving voltage V2 is applied to the ends on the other side, wherein the voltage phases of the applied driving voltages are within the target adjustment range; S05: Apply a driving voltage to each electrode unit according to the position of each electrode unit in the second pattern electrode. Assuming that the second pattern electrode has n electrode units, the driving voltage of the i-th electrode unit is Where 1≤i≤n.

10. Electronic products, characterized in that, The invention comprises a control circuit and the liquid crystal lens according to any one of claims 1 to 7, wherein the control circuit is electrically connected to the liquid crystal lens, and / or the liquid crystal lens is driven by the method according to claim 8 or 9.

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