CN118311808A - Liquid crystal optical device, electronic product and driving method - Google Patents

Abstract

The invention relates to the technical field of optics, in particular to a liquid crystal optical device and an electronic product. The liquid crystal optical device comprises a first substrate, a first electrode layer, a first orientation layer, a liquid crystal layer, a second orientation layer, a second electrode layer and a second substrate which are sequentially laminated; the second electrode layer comprises a plurality of electrode structures, each electrode structure comprises at least one electrode wire extending from the center of the second electrode layer towards the edge direction of the second electrode layer, the opposite ends of the electrode wire are respectively used for loading first driving voltage and second driving voltage, each electrode wire comprises a plurality of concentric circular arc sections with different radiuses, two adjacent concentric circular arc sections are connected through a connecting section, the adjacent connecting sections are respectively arranged at the opposite ends of the concentric circular arc sections, each concentric circular arc section comprises a first end and a second end which are opposite, and each electrode structure corresponds to a virtual sector. The invention can effectively eliminate the capacitance effect of the liquid crystal optical device.

Description

Liquid crystal optical device, electronic product and driving method

Technical Field

The invention relates to the technical field of optics, in particular to a liquid crystal optical device, an electronic product and a driving method.

Background

In order to improve the accuracy of spatial potential distribution of liquid crystal optical devices such as liquid crystal lenses, liquid crystal fresnel lenses, and the like, the applicant has proposed to employ concentric circular arc electrode lines that can produce gradient change distribution in the liquid crystal optical device, and to precisely control the spatial potential distribution in the functional region of the liquid crystal optical device by controlling the position through which the electrode lines pass in the functional region of the liquid crystal optical device. However, with the above structure, a significant capacitive effect is generated, so that a large error exists between the actual potential distribution and the ideal potential distribution.

Disclosure of Invention

In view of the above, embodiments of the present invention provide a liquid crystal optical device, an electronic product, and a driving method, which are used for solving the technical problem that the accuracy of potential distribution is affected by the capacitance effect in the existing liquid crystal optical device.

The technical scheme adopted by the invention is as follows:

In a first aspect, the present invention provides a liquid crystal optical device, including a first substrate, a first electrode layer, a first alignment layer, a liquid crystal layer, a second alignment layer, a second electrode layer, and a second substrate, which are sequentially stacked;

The second electrode layer comprises a plurality of electrode structures, each electrode structure comprises at least one electrode wire extending from the center of the second electrode layer towards the edge direction of the second electrode layer, two opposite ends of the electrode wire are respectively used for loading first driving voltage and second driving voltage, each electrode wire comprises a plurality of concentric circle arc sections with different radiuses, two adjacent concentric circle arc sections are connected through a connecting section, the adjacent connecting sections are respectively arranged at two opposite ends of the concentric circle arc sections, each concentric circle arc section comprises a first end and a second end which are opposite, each electrode structure corresponds to one virtual sector, the first end of each concentric circle arc section in the same electrode structure is located on one straight boundary of the virtual sector corresponding to the electrode structure, the second end of each concentric circle arc section is located on the other straight boundary of the virtual sector corresponding to the electrode structure, and the sum of the central angles of the virtual sectors corresponding to all the electrode structures is 2 pi.

Preferably, the electrode assembly further comprises a first electrode lead and a second electrode lead, wherein one end of each electrode wire close to the center of the second electrode layer is connected with the first electrode lead, and one end of each electrode wire far away from the center of the second electrode layer is connected with the second electrode lead.

Preferably, each electrode structure has one electrode wire, and one end of each electrode unit near the center of the second electrode layer is connected together, and one end of each electrode wire far from the center of the second electrode layer is connected through a first lead wire.

Preferably, the electrode lines are used to form a potential distribution of a paraboloid of revolution having a rotation angle greater than 0 and less than 2pi after the application of the first and second driving voltages.

Preferably, each electrode structure comprises more than two electrode wires, and the electrode wires in the same electrode structure are sequentially arranged from the center of the second electrode layer towards the edge of the second electrode layer.

Preferably, the surface electrode and each electrode line deflect liquid crystal in the liquid crystal layer to form a liquid crystal fresnel lens under the driving of the first driving voltage and the second driving voltage.

Preferably, the central angles of the virtual sectors corresponding to the electrode structures are equal.

Preferably, the central angles of the virtual sectors corresponding to the at least two electrode structures are not equal.

In a second aspect, the present invention further provides an electronic product, including a control circuit and the liquid crystal optical device of the first aspect, where the control circuit is electrically connected to the liquid crystal optical device.

In a third aspect, the present invention provides a driving method of a liquid crystal optical device, for the liquid crystal optical device of the first aspect, where a first driving voltage is set to V1, and a second driving voltage is set to V2, the method including the steps of:

Acquiring a liquid crystal linear working interval of a liquid crystal optical device;

Obtaining a minimum voltage Vmin and a maximum voltage Vmax in the liquid crystal linear working interval according to the liquid crystal linear working interval;

The voltage difference between V1 and V2 is adjusted according to the minimum voltage Vmin and the maximum voltage Vmax to adjust the focal power of the liquid crystal lens, wherein Vmin is less than or equal to V1 and less than or equal to Vmax, and Vmin is less than or equal to V2 and less than or equal to Vmax.

The beneficial effects are that: according to the liquid crystal optical device, the electronic product and the liquid crystal optical device driving method, the circular clear aperture of the liquid crystal optical device is divided into a plurality of areas by arranging the electrode structures, and each electrode structure controls the potential distribution of a corresponding area after the first driving voltage and the second driving voltage are loaded. Because the electrode wires in the electrode structure adopt a concentric arc structure with end points on the sector boundary, each electrode wire can form a parabola with a parabolic section after being loaded with driving voltage, and the rotation angle is between 0 and 2 pi. Since the sum of the central angles of the sector areas occupied by all the electrode structures is 2 pi, the complete potential distribution of the paraboloid of revolution with the angle of 2 pi can be formed after the driving voltage is applied to all the electrode structures. Because the central angle of the area occupied by the single electrode structure is smaller than 2 pi, the length of the electrode wire in the single electrode is shorter, so that the influence of the capacitance effect on the optical effect of the liquid crystal optical device can be remarkably 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 of an exploded structure of a liquid crystal optical device of the present invention;

FIG. 2 is a diagram of a four-quarter electrode structure of a second electrode layer according to the present invention;

FIG. 3 is a diagram showing an electrode structure of a second electrode layer eight-equal division in the present invention;

FIG. 4 is a diagram showing an electrode structure of a non-uniform division of a second electrode layer according to the present invention;

FIG. 5 is a schematic diagram showing the structure of a second electrode layer of the liquid crystal Fresnel lens of the present invention;

FIG. 6 is a schematic view of an electrode unit according to the present invention;

FIG. 7 is a schematic view of another electrode unit according to the present invention;

FIG. 8 is a schematic view of a second embodiment of the present invention in which the projections of the first electrode structure and the second electrode structure are in concentric circular arc shapes;

FIG. 9 is a schematic diagram of the present invention for applying a driving voltage using electrode leads;

FIG. 10 is a schematic diagram of another embodiment of the present invention for applying a driving voltage using electrode leads.

Parts and numbers in the figure:

The first substrate 10, the first electrode layer 20, the first alignment layer 30, the liquid crystal layer 40, the second alignment layer 50, the second electrode layer 60, the second substrate 70, the electrode unit 61, the electrode wire 62, the concentric circular arc segment 621, the first end portion 6211, the second end portion 6212, the joint segment 622, the virtual sector 8, the straight boundary 81, the first electrode lead 91, the second electrode lead 92, the first conductive wire 93, the second conductive wire 94, and the third conductive wire 95.

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 other like 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 present embodiment provides a liquid crystal optical device, as shown in fig. 1, which includes a first substrate 10, a first electrode layer 20, a first alignment layer 30, a liquid crystal layer 40, a second alignment layer 50, a second electrode layer 60, and a second substrate 70, which are sequentially stacked; in embodiments the liquid crystal optical device may take the form of a layered arrangement. The first substrate 10, the first electrode layer 20, the first alignment layer 30, the liquid crystal layer 40, the second alignment layer 50, the second electrode layer 60, and the second substrate 70 are stacked along the normal direction of each layer of the liquid crystal optical device. Wherein the first substrate 10 and the second substrate 70 may be made of a transparent material having a certain strength and rigidity, such as a glass substrate, a plastic substrate, etc. Wherein the first substrate 10 may function to support liquid crystal optics. Wherein the first substrate 10 may act as a carrier for the first electrode layer 20, the first electrode layer 20 may be plated on the first substrate 10. The second substrate 70 also serves as a support, and may also serve as a carrier for the second electrode layer 60.

The form of the first electrode layer 20 may be set as needed, for example, the first electrode layer 20 may be set as a surface electrode, so that the first electrode layer 20 may form an equipotential plane, or may be set as various pattern electrodes, which is not limited herein.

As shown in fig. 2 to 5, the second electrode layer 60 includes a plurality of electrode structures in the present embodiment, each of which includes at least one electrode line 61 extending from the center of the second electrode layer 60 toward the edge of the second electrode layer 60.

The electrode wire 61 may be made of a conductive wire having a certain resistance, or may be made of a thin wire having a certain resistance and capable of conducting electricity, which is plated on the surface of the second substrate 70. The electrode lines 61 may also be made of a transparent conductive material in order to enhance the light-transmitting effect of the liquid crystal optical device. Wherein the transparent conductive material includes, but is not limited TO, ito electrode material, FTO electrode material, AZO electrode material, izo electrode material, ZO electrode material, and the like.

Opposite ends of the electrode line 61 are respectively used for loading a first driving voltage V1 and a second driving voltage V2. The electrode wire 61 can control the potential of the region through which it passes during the inside-out extension after the two driving voltages are applied to both ends of the electrode wire 61.

As shown in fig. 6 and 7, the electrode wire 61 includes a plurality of concentric circular segments 621 of different radii which control the magnitude of the electrical potential at different radial locations in the liquid crystal optic. The two adjacent concentric arc sections 621 are connected by a connecting section 622, and the adjacent connecting sections 622 are respectively disposed at two opposite ends of the concentric arc sections 621, i.e. the connecting sections 622 are alternately disposed at two sides of the concentric arc sections 621 to form a reciprocating bending structure for the electrode wires 61.

As shown in fig. 8, the concentric arc segments 621 include opposite first and second ends 6211 and 6212, each electrode structure corresponds to one virtual sector 8, the first end 6211 of each concentric arc segment 621 in the same electrode structure is located on one of the straight boundaries 81 of the virtual sector 8 to which the electrode structure corresponds, and the second end 6212 is located on the other straight boundary 81 of the virtual sector 8 to which the electrode structure corresponds.

In this embodiment, each electrode structure occupies a sector-shaped area, and the boundary of the sector-shaped area is a sector, that is, the virtual sector 8 corresponding to the electrode structure. In the implementation, the electrode structures can be arranged for one circle along the circumferential direction of the second electrode layer 60, so that the whole second electrode layer 60 is filled, and a liquid crystal lens or a liquid crystal fresnel lens with a complete circular light transmission aperture is formed. The virtual sector 8 is defined by an arc-shaped boundary and two straight-line boundaries, which are also referred to as a first straight-line boundary 81 and a second straight-line boundary 81 in the present embodiment for convenience of description. The same side end of the same concentric arc line falls on the same straight line boundary. The area occupied by the electrode structure is thus not seen to be exactly a sector-shaped area, and the area of the controlled potential distribution after the application of the first and second drive voltages is also a sector-shaped area. In order to control the potential distribution of the complete circular area, the present embodiment may set the sum of the central angles of the virtual sectors 8 corresponding to all the electrode structures to 2π.

The present embodiment controls the potential distribution of a plurality of sector areas by a plurality of electrode structures, and combines the sector areas into a complete circle, thereby controlling the potential distribution of the circular area. Since one electrode structure only needs to control the potential distribution of one sector area, the length of the electrode line 61 required for one electrode structure is greatly shortened. This can significantly increase the conductivity or thickness of the electrode line 61, thereby reducing the influence of the capacitance effect while controlling the potential distribution at each position in the functional region of the liquid crystal optical device with only two driving voltages, so that the accuracy of the potential distribution is further improved.

The liquid crystal optical device of the present embodiment may form either a normal liquid crystal lens or a liquid crystal fresnel lens.

When it is desired to form a conventional liquid crystal lens, one electrode line 61 is used for each electrode structure. At this time, after the first driving voltage and the second driving voltage are applied to both ends of the electrode line 61, a potential distribution of a paraboloid of revolution having a section of a paraboloid of revolution with a rotation angle of more than 0 and less than 2 pi can be formed.

As shown in fig. 5 and 7, when it is required to form a liquid crystal fresnel lens, two or more electrode lines 61 may be provided in each of the electrode structures, and the respective electrode lines 61 in the same electrode structure may be sequentially arranged from the center of the second electrode layer 60 toward the edge of the second electrode layer 60. The surface electrodes and the respective electrode lines 61 deflect the liquid crystal in the liquid crystal layer 40 to form a liquid crystal fresnel lens under the driving of the first and second driving voltages.

The same zone is divided into a plurality of small arc-shaped areas after the aforementioned structure is adopted, and the potential of each arc-shaped area is controlled by the electrode wire 61 occupying the arc-shaped area. Since the electrode wire 61 in this embodiment adopts a structure in which concentric arcs with different radii are connected end to end, after the electrode wire 61 is loaded with the first driving voltage and the second driving voltage, a potential distribution of a paraboloid of revolution is formed in an arc area occupied by the electrode wire 61, and the section of the paraboloid of revolution is a paraboloid, and the rotation angle of the paraboloid of revolution is between 0 pi and 2 pi. The areas controlled by all the electrode lines 61 in the same annulus are combined to form a complete annulus, which deflects the liquid crystal material in the liquid crystal layer 40 under the control of the electrode lines 61 so that the phase retardation distribution produced by the light beam passing through the annulus is equivalent to the phase retardation distribution produced by the light beam after passing through the fresnel annulus in a conventional fresnel lens.

Since each electrode structure is composed of a plurality of electrode wires 61, the electrode wires 61 are arranged at different radial positions. Therefore, the electrode structures can control the potential distribution of a plurality of annular zones, the annular zones are sequentially arranged from inside to outside, and the potential distribution generated by each annular zone can lead the optical effect generated after the liquid crystal material is deflected to be equivalent to the optical effect of the Fresnel annular zone in the common Fresnel lens, so that the liquid crystal Fresnel lens can be formed under the combined action of all the electrode structures. The electric potential distribution of each annular zone region in the liquid crystal fresnel lens is controlled by a plurality of electrode lines 61 occupying the arc-shaped region, and the electrode lines 61 of the present embodiment are shorter in length and less affected by the capacitive effect than the electric potential distribution of the entire annular zone region controlled by one electrode line 61.

As shown in fig. 9 and 10, in order to facilitate loading of the first driving voltage and the second driving voltage, the liquid crystal optical device of the present embodiment further includes a first electrode lead 91 and a second electrode lead 92, one end of each electrode line 61 near the center of the second electrode layer 60 is connected to the first electrode lead 91, and one end of each electrode line 61 far from the center of the second electrode layer 60 is connected to the second electrode lead 92. Wherein the first electrode lead 91 is used for introducing a first driving voltage and the second electrode lead 92 is used for introducing a second driving voltage. One end of each electrode line 61 near the center of the second electrode layer 60 is loaded with a first driving voltage through a first electrode lead 91, and one end of each electrode far from the center of the second electrode layer 60 is loaded with a second driving voltage through a second electrode lead 92.

As shown in fig. 9, when each electrode structure implements a general liquid crystal lens using one electrode wire 61, one end of each electrode unit 61 near the center of the second electrode layer 60 is connected together and directly connected to a first electrode lead 91, one end of each electrode wire 61 far from the center of the second electrode layer 60 is connected together through a first conductive wire 93, and then the first conductive wire 93 is connected to a second electrode lead 92, thereby implementing that one end of each electrode wire 61 far from the center of the second electrode layer 60 is loaded with a second driving voltage through the second electrode lead 92.

As shown in fig. 10, when each electrode structure employs a plurality of electrode lines 61 to realize a liquid crystal fresnel lens, one end of each electrode line 61 near the center of the second electrode layer 60 in the same zone area is connected together by a second wire 94, the second wire 94 is connected to a first electrode lead 91, and since there are a plurality of zone areas, a plurality of second wires 94 may be provided, each second wire 94 corresponding to one zone area, one end of each electrode line 61 in each zone area near the center of the second electrode layer 60 is connected to the corresponding second wire 94, and all second wires 94 are connected to the first electrode lead 91, thereby realizing that one first electrode lead 91 loads a first driving voltage to one end of all electrode lines 61 near the center of the second electrode layer 60.

One end of each electrode wire 61 in the same annulus region, which is far from the center of the second electrode layer 60, is connected to the third lead wire 95 through the third lead wire 95, and the third lead wire 95 is connected to the second electrode lead wire 92, and since there are a plurality of annulus regions, a plurality of third lead wires 95 may be provided, each third lead wire 95 corresponds to one annulus region, one end of each electrode wire 61 in each annulus region, which is far from the center of the second electrode layer 60, is connected to the third lead wire 95 corresponding to the annulus region, and all third lead wires 95 are connected to the second electrode lead wire 92, so that one second electrode lead wire 92 loads the second driving voltage to one end of all electrode wires 61, which is far from the center of the second electrode layer 60.

As one example, the central angles of the virtual sectors 8 corresponding to the respective electrode structures are equal in the present embodiment. With the above-described structure, the area where the second electrode layer 60 is located is equally divided by the sector area occupied by each electrode structure, in which case the length of the individual electrode line 61 is shortest and the capacitance effect generated is also smallest, so that the control accuracy of the potential distribution can be further improved.

As one example, in the present embodiment, the central angles of the virtual sectors 8 corresponding to at least two electrode structures are not equal. That is, in this embodiment, the angles of the virtual sectors 8 corresponding to the respective electrode structures may be partially or entirely set to be different as needed. The sector area occupied by each electrode structure does not completely bisect the area of the second electrode layer 60, but is still less affected by the capacitive effect than the control of a complete circular area with one electrode structure.

Example 2

The present embodiment provides an electronic product including a control circuit and the liquid crystal optical device described in embodiment 1, the control circuit being electrically connected to the liquid crystal optical device. The electronic product includes, but is not limited to, an imaging device, a display device, a mobile phone, an AR device, a VR device, a naked eye 3D product, a wearable device, and the like.

Example 3

The present embodiment provides a driving method of a liquid crystal optical device, for driving the liquid crystal optical device according to any one of claims 1 to 8, with a first driving voltage V1 and a second driving voltage V2, the method comprising the steps of:

S1: acquiring a liquid crystal linear working interval of a liquid crystal optical device;

the liquid crystal linear operation interval refers to a voltage interval in which the liquid crystal phase retardation amount and the driving voltage are in a linear relationship.

S2: obtaining a minimum voltage Vmin and a maximum voltage Vmax in the liquid crystal linear working interval according to the liquid crystal linear working interval;

S3: the voltage difference between V1 and V2 is adjusted according to the minimum voltage Vmin and the maximum voltage Vmax to adjust the focal power of the liquid crystal lens, wherein Vmin is less than or equal to V1 and less than or equal to Vmax, and Vmin is less than or equal to V2 and less than or equal to Vmax.

This step can adjust the optical power of the liquid crystal optic by adjusting the difference between V1 and V2. V1 can be kept unchanged during specific adjustment, and the size of V2 can be adjusted; v1 can be kept unchanged, and the size of V2 can be adjusted; the magnitudes of V1 and V2 can also be changed simultaneously. When V1 is kept unchanged and V2 is adjusted in size, v1=vmin or v1=vmax may be set and V2 is adjusted in size; when V2 is kept unchanged and V1 is resized, v2=vmin or v2=vmax may be set and V1 is resized.

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.

Claims (10)

1. The liquid crystal optical device is characterized by comprising a first substrate, a first electrode layer, a first orientation layer, a liquid crystal layer, a second orientation layer, a second electrode layer and a second substrate which are sequentially stacked;

The second electrode layer comprises at least two electrode structures, each electrode structure comprises at least one electrode wire extending from the center of the second electrode layer towards the edge direction of the second electrode layer, two opposite ends of the electrode wire are respectively used for loading a first driving voltage and a second driving voltage, the electrode wire comprises a plurality of concentric circle arc sections with different radiuses, two adjacent concentric circle arc sections are connected through a connecting section, the adjacent connecting sections are respectively arranged at two opposite ends of the concentric circle arc sections, each concentric circle arc section comprises a first end and a second end which are opposite, each electrode structure corresponds to one virtual sector, the first end of each concentric circle arc section in the same electrode structure is located on one straight boundary of the virtual sector corresponding to the electrode structure, the second end of each concentric circle arc section is located on the other straight boundary of the virtual sector corresponding to the electrode structure, and the sum of the central angles of the virtual sectors corresponding to all the electrode structures is 2 pi.

2. The liquid crystal optical device of claim 1, further comprising a first electrode lead and a second electrode lead, wherein an end of each electrode wire near a center of the second electrode layer is connected to the first electrode lead, and an end of each electrode wire remote from the center of the second electrode layer is connected to the second electrode lead.

3. A liquid crystal optical device as claimed in claim 1, wherein each electrode structure has an electrode wire, and wherein the ends of each electrode unit near the center of the second electrode layer are connected together, and the ends of each electrode wire far from the center of the second electrode layer are connected by a first wire.

4. The liquid crystal optical device according to claim 1, wherein the electrode lines are configured to form a potential distribution of a paraboloid of revolution upon application of the first and second driving voltages, the paraboloid of revolution having an angle of revolution greater than 0 and less than 2 pi.

5. The liquid crystal optical device according to claim 1, wherein each of the electrode structures includes two or more electrode lines, and the electrode lines in the same electrode structure are sequentially arranged from a center of the second electrode layer toward an edge of the second electrode layer.

6. The liquid crystal optical device of claim 5, wherein the face electrode and each electrode line deflect liquid crystal in the liquid crystal layer under the drive of the first and second drive voltages to form a liquid crystal fresnel lens.

7. A liquid crystal optical device according to any one of claims 1 to 6, wherein the central angles of the virtual sectors corresponding to the respective electrode structures are equal.

8. A liquid crystal optical device according to any one of claims 1 to 6, wherein the central angles of the virtual sectors corresponding to the at least two electrode structures are not equal.

9. An electronic product comprising a control circuit and the liquid crystal optical device of any one of claims 1 to 8, the control circuit being electrically connected to the liquid crystal optical device.

10. A liquid crystal optical device driving method for driving the liquid crystal optical device according to any one of claims 1 to 8, provided that a first driving voltage is V1 and a second driving voltage is V2, the method comprising the steps of:

Acquiring a liquid crystal linear working interval of a liquid crystal optical device;

Obtaining a minimum voltage Vmin and a maximum voltage Vmax in the liquid crystal linear working interval according to the liquid crystal linear working interval;

The voltage difference between V1 and V2 is adjusted according to the minimum voltage Vmin and the maximum voltage Vmax to adjust the focal power of the liquid crystal lens, wherein Vmin is less than or equal to V1 and less than or equal to Vmax, and Vmin is less than or equal to V2 and less than or equal to Vmax.