Fresnel liquid crystal lens and electronic product

Abstract

The application belongs to the technical field of liquid crystal lens, and particularly relates to a Fresnel liquid crystal lens and an electronic product. The Fresnel liquid crystal lens comprises a first transparent substrate, a first electrode layer, a first orientation layer, a liquid crystal layer, a second orientation layer, a second electrode layer and a second transparent substrate which are sequentially stacked; the second electrode layer comprises a plurality of electrode units; the electrode unit comprises a first conductive wire and a plurality of second conductive wires; the first conductive wire comprises a first position and a second position, the first position is different from the second position, the first position is used for receiving a first driving voltage, and the second position is used for receiving a second driving voltage; one end of the second conductive wire is connected with the first conductive wire, and the opposite end is suspended, and the position where the second conductive wire is connected with the first conductive wire is a leading-out position. The application can improve the utilization rate of liquid crystal material.

Description

Technical Field

[0001] This invention belongs to the field of liquid crystal lens technology, and particularly relates to a Fresnel liquid crystal lens and electronic products. Background Technology

[0002] When the aperture of a liquid crystal lens is large, the required driving voltage is very high. Existing technology utilizes the principle of Fresnel lenses to design Fresnel liquid crystal lenses. Since the phase of the liquid crystal material responds linearly to the applied voltage within a certain voltage range, this voltage range is called the linear response range or the linear operating range of the liquid crystal. To facilitate precise control of the potential distribution of the liquid crystal layer, existing technology proposes controlling the driving voltage of the liquid crystal lens based on the range of the linear response range. For example, in patent publication number CN114185222A, the minimum and maximum driving voltages of the liquid crystal device are set within the linear operating range of the liquid crystal to drive the liquid crystal device. Figure 1 As shown in the response curve of the liquid crystal material, although selecting the driving voltage within the linear response range can conveniently and accurately drive the liquid crystal lens, the voltage range of the linear response range is small, which results in insufficient optical power of the designed Fresnel liquid crystal device, greatly limiting the application range of the Fresnel liquid crystal lens. Summary of the Invention

[0003] In view of this, embodiments of the present invention provide a Fresnel liquid crystal lens, device, equipment, and storage medium to solve the technical problem that the optical power of a liquid crystal cylindrical lens is insufficient due to the small linear response range of the liquid crystal material.

[0004] The technical solution adopted in this invention is:

[0005] In a first aspect, the present invention provides a Fresnel liquid crystal lens, comprising a first transparent substrate, a first electrode layer, a first alignment layer, a liquid crystal layer, a second alignment layer, a second electrode layer, and a second transparent substrate, which are sequentially stacked.

[0006] The first electrode layer is a surface electrode;

[0007] The second electrode layer includes multiple electrode units, which are arranged sequentially from the position closest to the center of the second electrode layer to the position furthest from the center of the second electrode layer;

[0008] The electrode unit includes a first conductive line and multiple second conductive lines. The first conductive line includes a first position and a second position, which are different from each other. The portion of the first conductive line between the first and second positions has the same width. The first position is used to receive a first driving voltage, and the second position is used to receive a second driving voltage.

[0009] One end of the second conductive wire is connected to the first conductive wire, and the other end is suspended. The position where the second conductive wire is connected to the first conductive wire is the lead-out position. At least a portion of the lead-out positions are located between the first position and the second position of the first conductive wire, and at least two lead-out positions are different.

[0010] The first conductive wire includes multiple extension segments, a first connecting segment, and a second connecting segment. Adjacent extension segments are connected by the first connecting segment or the second connecting segment. The multiple extension segments are arranged sequentially from the center of the second electrode layer to the direction away from the center of the second electrode layer. The extension segment extends from its starting position to the position where it is connected to the first connecting segment. The lead-out position is set at the position where the extension segment is connected to the first connecting segment. The starting position of the extension segment is connected to the second connecting segment.

[0011] For any given electrode unit, let x be the radial distance between the starting position of the extension segment and the first position of that electrode unit. Then the length of the extension segment is g(x), where... C is a constant. This represents the rate of change of the phase of a liquid crystal material with respect to voltage.

[0012] Preferably, each electrode unit in the second electrode layer corresponds to at least one Fresnel ring; when the electrode unit is loaded with a first driving voltage and a second driving voltage, the potential generated by the second conductive line of the electrode unit causes the liquid crystal in the liquid crystal layer to form a phase distribution equivalent to the Fresnel ring corresponding to the electrode unit.

[0013] Preferably, the second conductive wire is arc-shaped.

[0014] Preferably, the extension of the first conductive wire is arc-shaped.

[0015] Preferably, the starting position and the exit position of at least one of the plurality of extension segments are connected to two adjacent extension segments via a first connecting segment and a second connecting segment, respectively.

[0016] Preferably, the device further includes an electrode lead assembly, which includes a first electrode lead and a second electrode lead extending from near the center of the second electrode layer toward away from the second electrode layer. One end of the first electrode lead is connected to a first driving voltage, and the other end is electrically connected to a first position of the first conductive line. One end of the second electrode lead is connected to a second driving voltage, and the other end is electrically connected to a second position of the first conductive line. The starting position of the extension segment and the suspended end of the second conductive line are respectively located on opposite sides of the first electrode lead.

[0017] Preferably, the electrode lead assembly further includes a third electrode lead, which extends from a second position of the first conductive line along the radial direction of the liquid crystal lens to a position connected to the second electrode lead.

[0018] Preferably, the spacing between adjacent second conductive lines is less than or equal to 100 μm.

[0019] Preferably, a high-resistivity film or a high-dielectric-constant layer is disposed between the second electrode layer and the second alignment layer or between the second electrode layer and the second transparent substrate.

[0020] In a second aspect, the present invention provides an electronic product, including a control circuit and the Fresnel liquid crystal lens described in the first aspect, wherein the control circuit is electrically connected to the Fresnel liquid crystal lens.

[0021] Beneficial Effects: The Fresnel liquid crystal lens and electronic product of the present invention utilize a first conductive line in the electrode unit, which can be loaded with two driving voltages, to generate a potential of varying magnitude depending on the position of the conductive line. Multiple second conductive lines are then led out from different positions of the non-conductive line. Since one end of each second conductive line is connected to the first conductive line and the other end is suspended, the second conductive line can diffuse the potential at the point of exit from the first conductive line to the region where the lead-out line extends. Based on the aforementioned structure, the present invention sets the distance x between the starting position of the extension segment and the center of the second electrode layer and the length g(x) of the extension segment to satisfy... C is a constant. This represents the rate of change of the phase of the liquid crystal material with voltage. Thus, even if the first driving voltage V1 applied at the first position and the second driving voltage V2 applied at the second position are not within the linear response region of the liquid crystal material, the electrode units can still ensure an accurate parabolic phase distribution. Since multiple electrode units are arranged sequentially from the center of the second electrode layer to the position furthest from the center, these electrode units combined can achieve an optical effect equivalent to a complete Fresnel lens. With the solution of this invention, the application of liquid crystal materials is no longer limited by the linear response range of the liquid crystal material, thereby improving the phase distribution accuracy and significantly increasing the optical power of the liquid crystal cylindrical lens, thus significantly increasing the utilization rate of the liquid crystal material. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, and these are all within the protection scope of the present invention.

[0023] Figure 1 The response curve of the liquid crystal material;

[0024] Figure 2 This is a cross-sectional view of the Fresnel liquid crystal lens of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the second electrode layer of the present invention;

[0026] Figure 4 This is a schematic diagram of the phase distribution of the liquid crystal material corresponding to the Fresnel bands in this invention;

[0027] Figure 5 This is a schematic diagram of the structure of the electrode unit near the center of the second electrode layer in this invention;

[0028] Figure 6 This is a schematic diagram of the structure of the electrode unit located on the periphery of the second electrode layer in this invention;

[0029] Figure 7 This is a schematic diagram of the structure of the first conductive line in this invention;

[0030] Figure 8 This is a partial structural schematic diagram of the first conductive wire in this invention;

[0031] Explanation of reference numerals in the attached figures:

[0032] Parts and their numbers in the diagram:

[0033] First transparent substrate 10, first electrode layer 20, first alignment layer 30, liquid crystal layer 40, second alignment layer 50, second electrode layer 60, electrode unit 61, first conductive line 611, first position 6111, second position 6112, extension segment 6113, first connecting segment 6114, second connecting segment 6115, lead-out position 6116, starting position 6117, second conductive line 612, first electrode lead 613, second electrode lead 614, third electrode lead 615, second transparent substrate 70. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, in this document, relational terms such as "first" and "second" are used merely 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 terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, the element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Where there is no conflict, embodiments of the present invention and the various features thereof can be combined with each other, all of which are within the scope of protection of the present invention.

[0035] Example 1

[0036] like Figure 2 As shown, this embodiment provides a Fresnel liquid crystal lens. The Fresnel lens in this embodiment includes a first transparent 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 transparent substrate 70, which are stacked sequentially.

[0037] The Fresnel lens in this embodiment can adopt a layered structure. The aforementioned liquid crystal layer 40, first alignment layer 30, second alignment layer 50, first electrode layer 20, second electrode layer 60, first transparent substrate 10, and second transparent substrate 70 are located in different layers, and these layers are stacked along the light transmission direction of the liquid crystal optical device, i.e., the normal direction of each layer. The arrangement can be found in [reference needed]. Figure 2 As shown, in Figure 2Along the light transmission direction of the liquid crystal optical device, from bottom to top, are a first transparent 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 transparent substrate 70. Specifically, the first alignment layer 30 and the second alignment layer 50 are located on opposite sides of the liquid crystal layer 40; the first electrode layer 20 is located on the side of the first alignment layer 30 facing away from the liquid crystal layer 40; the second electrode layer 60 is located on the side of the second alignment layer 50 facing away from the liquid crystal layer 40; the first transparent substrate 10 is located on the side of the first electrode layer 20 facing away from the liquid crystal layer 40; and the second transparent substrate 70 is located on the side of the second electrode layer 60 facing away from the liquid crystal layer 40.

[0038] The first transparent substrate 10 and the second transparent substrate 70 can be made of transparent materials with certain strength and rigidity, such as glass substrates or plastic substrates. The first substrate serves to support the liquid crystal optical device. The first transparent substrate 10 can serve as a carrier for the first electrode layer 20, which can be deposited on the first substrate. The second substrate also serves a supporting function and can also serve as a carrier for the second electrode layer 60, which can be deposited on the second transparent substrate 70.

[0039] The first electrode layer 20 is a surface electrode. In this embodiment, the first electrode layer 20 is used to form an equipotential plane.

[0040] like Figure 3 As shown, in this embodiment, the second electrode layer 60 includes a plurality of electrode units 61, which are arranged sequentially from a position close to the center of the second electrode layer 60 to a position away from the center of the second electrode layer 60.

[0041] The aforementioned plurality of electrode units 61 refers to two or more electrode units 61 in the second electrode layer 60. These electrode units 61 are generally in the shape of concentric rings and are arranged sequentially from the center outward on the second electrode layer 60.

[0042] like Figure 5 As shown, for one of the electrode units 61, it mainly includes a first conductive line 611 and multiple second conductive lines 612. The first conductive line 611 includes a first position 6111 and a second position 6112. The first position 6111 and the second position 6112 are different. The portion of the first conductive line 611 located between the first position 6111 and the second position 6112 has the same width. The first position 6111 is used to receive a first driving voltage, and the second position 6112 is used to receive a second driving voltage.

[0043] In this embodiment, the first conductive line 611 and the second conductive line 612 include, but are not limited to, wires with a certain resistance, and thin lines with a certain resistance and conductivity plated on a transparent second substrate. To improve the lens effect, the conductive lines in this embodiment can all be made of transparent conductive materials, including but not limited to ITO electrode materials, IZO electrode materials, FTO electrode materials, AZO electrode materials, and IGZO electrode materials.

[0044] like Figure 3 , Figure 6 and Figure 7 As shown, in this embodiment, a first driving voltage is applied at a first position 6111 on the first conductive line 611, and a second driving voltage is applied at a second position 6112 on the first conductive line 611. Since the first position 6111 and the second position 6112 are different, the positions at which the first driving voltage and the second driving voltage are applied on the first conductive line 611 are also different.

[0045] When the first position 6111 and the second position 6112 on the first conductive line 611 are respectively loaded with the aforementioned two driving voltages, an electric potential with a magnitude that varies with the position of the first conductive line 611 can be formed on the first conductive line 611 between the aforementioned two positions.

[0046] like Figure 5 and Figure 6 As shown, one end of the second conductive wire 612 is connected to the first conductive wire 611, and the other end is suspended. The position where the second conductive wire 612 is connected to the first conductive wire 611 is the lead-out position 6116. At least a portion of the lead-out positions 6116 are located between the first position 6111 and the second position 6112 of the first conductive wire 611, and at least two lead-out positions 6116 are different.

[0047] Because the second conductive wire 612 in this embodiment is connected to the first conductive wire 611 at one end and left suspended at the other end, the potential at each position on the same second conductive wire 612 is equal, and equal to the potential of the first conductive wire 611 at the connection point between the second conductive wire 612 and the first conductive wire 611. Furthermore, because the width of the portion of the first conductive wire 611 between the first position 6111 and the second position 6112 is the same in this embodiment, the potential at each lead-out position 6116 on the first conductive wire 611 is linearly related to the length of the first conductive wire 611 between that position and the first position 6111.

[0048] like Figure 8As shown, the first conductive line 611 includes multiple extension segments 6113, a first connecting segment 6114, and a second connecting segment 6115. Adjacent extension segments 6113 are connected by either the first connecting segment 6114 or the second connecting segment 6115. The multiple extension segments 6113 are arranged sequentially from near the center of the second electrode layer 60 to away from the center of the second electrode layer 60. Each extension segment 6113 extends from a starting position 6117 to a position where it connects to the first connecting segment 6114. The lead-out position 6116 is located at the position where the extension segment 6113 connects to the first connecting segment 6114. The starting position 6117 of the extension segment 6113 connects to the second connecting segment 6115. In this embodiment, the aforementioned multiple extension segments 6113 are arranged along the radial direction of the Fresnel lens, thus allowing the potential distribution at various radial positions of the Fresnel lens to be controlled using the potential on different extension segments 6113. The ends of each extension segment 6113 at the starting position 6117 are connected by the first connecting segment 6114, while the ends of each extension segment 6113 away from the starting position 6117 are connected by the second connecting segment 6115. In this way, the extension segments 6113 can be connected end to end to form a potential distribution when the first driving voltage and the second driving voltage are applied.

[0049] For any one of the electrode units, let the radial distance between the starting position of the extension segment and the first position of the electrode unit be x, then the length of the extension segment 6113 is g(x), where C is a constant. This represents the rate of change of the phase of a liquid crystal material with respect to voltage.

[0050] In this embodiment, the length L of the extension segment 6113 in the electrode unit is set to be related to the radial distance between the starting position 6117 of the extension segment 6113 and the first position of the electrode unit. Specifically, the radial distance x between the starting position of the extension segment and the first position of the electrode unit can satisfy a certain functional relationship. For ease of description, the functional relationship satisfied by the radial distance x between the starting position of the extension segment and the first position of the electrode unit is denoted as g(x). For easier understanding, the relationship between the length L of the extension segment 6113 and the radial distance x between the starting position of the extension segment and the first position of the electrode unit can also be represented by a rectangular coordinate system. Let's take the radial distance between the starting position 6117 of the extension segment 6113 and the first position of the electrode unit as the x-axis of the rectangular coordinate system, and the length L of the extension segment 6113 as the y-axis to establish a rectangular coordinate system. Then, in this rectangular coordinate system, y = g(x) is satisfied. C is a constant. This represents the rate of change of the phase of a liquid crystal material with respect to voltage.

[0051] For an electrode unit 61 in a Fresnel liquid crystal lens, assuming the first driving voltage applied at the first position 6111 is V1 and the second driving voltage applied at the second position 6112 is V2, then the rate of phase change along the x-direction is:

[0052]

[0053] because

[0054]

[0055] so

[0056]

[0057] but

[0058]

[0059] The phase distribution is then as follows

[0060]

[0061] When the phase is parabolically distributed along the x-axis...

[0062]

[0063] therefore

[0064]

[0065] That is, when the condition is satisfied

[0066] In this embodiment, the phase distribution of the liquid crystal material satisfies a parabolic distribution.

[0067] in This represents the rate of change of the liquid crystal phase with voltage, reflected in Figure 1 The slope of the response curve shown is represented by the slope of the response curve. It can also be seen from the aforementioned relationship that the slope of curve g(x) is proportional to the reciprocal of the slope of the response curve.

[0068] For an electrode unit 61, with the aforementioned structure, the potential of each second wire can be precisely controlled through its lead-out position 6116, and the position of the second wire in the second liquid crystal layer 40 can also be precisely controlled, when g(x) satisfies When this is achieved, a precise potential distribution can be obtained that enables the phase of the liquid crystal material to be parabolic in the radial direction.

[0069] Because the optical effects of different Fresnel rings within the same Fresnel lens may differ, and the optical effects of individual Fresnel rings within different Fresnel lens designs may also differ, the parabolic shapes of the parabolic distributions satisfied by the liquid crystal materials in the various Fresnel rings of a liquid crystal Fresnel lens will differ. For example, the liquid crystal material in the central Fresnel ring satisfies a wider parabola with a smaller slope, while the liquid crystal material in the peripheral Fresnel ring satisfies a wider parabola with a larger slope.

[0070] The constant C in the functional relationship g(x) satisfied by each electrode unit 61 is also different. For example, the constant C in g(x) of the central electrode unit is smaller, while the constant C in g(x) of the peripheral electrode unit is larger. Therefore, different constants C can be set according to the parabolic shape of the Fresnel ring that achieves the same effect, so that the phase distribution of the liquid crystal material in this embodiment satisfies the corresponding parabolic distribution. No limitation is imposed here.

[0071] like Figure 4 As shown, in this embodiment, each electrode unit 61 in the second electrode layer 60 corresponds to at least one Fresnel ring; when the electrode unit 61 is loaded with a first driving voltage and a second driving voltage, the potential generated by the second conductive line 612 of the electrode unit 61 causes the liquid crystal in the liquid crystal layer 40 to form a phase distribution equivalent to the Fresnel ring corresponding to the electrode unit 61.

[0072] For example Figure 4 It includes two electrode units 61, each electrode unit 61 corresponding to a Fresnel ring. Figure 4 The curve below the middle electrode unit 61 represents the phase distribution of the liquid crystal material corresponding to the electrode unit 61. The horizontal axis of the curve represents the position of the liquid crystal material along the radial direction of the Fresnel liquid crystal lens, and the vertical axis of the curve represents the phase of the liquid crystal material.

[0073] According to the design and manufacturing principles of Fresnel lenses, the curvature of an optical surface determines the imaging characteristics in optical imaging. In the design of an optical lens, its surface curvature can be kept constant, but its surface thickness can be reduced during manufacturing. Lenses designed in this way can still converge light, focusing incident light onto a focal point. In the actual manufacturing and application of lenses, a spherical lens can be considered as several discontinuous components, removing excess portions between them while maintaining the original surface curvature during manufacturing to avoid affecting light deflection. The function of these discontinuous components is achieved by a series of Fresnel rings on the Fresnel lens. This embodiment can also utilize a liquid crystal lens to achieve an equivalent effect to a Fresnel lens. Since a traditional Fresnel lens consists of a series of Fresnel rings, this embodiment uses each electrode unit 61 to correspond to the optical effect of each Fresnel ring in the Fresnel lens. The combined effect of all electrode units 61 is equivalent to the overall optical effect of a Fresnel lens.

[0074] The phase distribution equivalent to the Fresnel ring here means that when the liquid crystal layer 40 forms the aforementioned phase distribution, the modulation effect on light is the same as the modulation effect on light by the corresponding Fresnel ring.

[0075] like Figure 4 As shown, in this embodiment, the lengths of the extension segments 6113 at different positions in the radial direction of the electrode unit 61 satisfy the aforementioned functional relationship to create a specific potential distribution in the radial direction of the lead-out position 6116. This potential distribution causes the phase distribution of the liquid crystal material in the radial direction to satisfy a parabolic distribution. Since the potential at each point on the second conductive line 612 is equal to the potential at the lead-out position 6116, the aforementioned potential distribution extends along the second conductive line 612 to various circumferential positions of the Fresnel liquid crystal lens, thereby achieving the corresponding Fresnel ring optical effect.

[0076] In this embodiment, the second electrode layer 60 adopts the aforementioned structure, which only requires two driving voltages, the first driving voltage and the second driving voltage, to achieve precise control of the potential at each position of the Fresnel ring corresponding to the electrode unit 61. Therefore, this embodiment can obtain a better Fresnel lens through a simple driving method.

[0077] Furthermore, since the Fresnel liquid crystal lens in this embodiment employs the aforementioned electrode structure, even if the first driving voltage V1 applied at the first position 6111 and the second driving voltage V2 applied at the second position 6112 are not within the linear response region of the liquid crystal material, this embodiment can still achieve an accurate parabolic phase distribution of the liquid crystal material. Thus, the application of the liquid crystal material is no longer limited by its linear response range, thereby significantly improving both the phase distribution accuracy and the optical power of the Fresnel liquid crystal lens, and significantly increasing the utilization rate of the liquid crystal material.

[0078] In this embodiment, as an optional but advantageous implementation, the second conductive line 612 is arc-shaped. For one electrode unit 61, different second conductive lines 612 are led out from different lead-out positions 6116, and these second conductive lines are arranged from the inside to the outside along the radial direction of the Fresnel liquid crystal lens. Each second conductive line can be an arc-shaped segment, and these arcs can be concentric arcs. When the second conductive line 612 is arc-shaped, the electrode unit 61 can achieve the effect of a circular Fresnel ring, and the combination of all electrode units 61 can achieve the optical effect of a circular Fresnel lens.

[0079] As an optional but advantageous implementation, in this embodiment, the extension 6113 of the first conductive line 611 is arc-shaped. The extension 6113 of the first conductive line 611 is arranged from the inside to the outside along the radial direction of the Fresnel liquid crystal lens, and each second conductive line 612 can be an arc-shaped segment, and these arcs can be concentric arcs. By adopting the aforementioned structure, the length of the extension 6113 can be set by setting the radius of the arc, thus simplifying the design and fabrication of the second electrode layer 60.

[0080] As an optional but advantageous implementation, this embodiment also includes an electrode lead assembly comprising a first electrode lead 613 and a second electrode lead 614 extending from near the center of the second electrode layer 60 toward a direction away from the second electrode layer 60. One end of the first electrode lead 613 is connected to a first driving voltage, and the other end is electrically connected to a first position 6111 of the first conductive line 611. One end of the second electrode lead 614 is connected to a second driving voltage, and the other end is electrically connected to a second position 6112 of the first conductive line 611. The starting position 6117 of the extension 6113 and the suspended end of the second conductive line 612 are respectively located on opposite sides of the first electrode lead 613.

[0081] To facilitate the application of driving voltage to the Fresnel liquid crystal lens, this embodiment provides a first electrode lead 613 and a second electrode lead 614 to introduce the first driving voltage to the first position 6111 and the second position 6112 of the first conductive line 611, respectively. Both the first electrode lead 613 and the second electrode lead 614 extend from the inside out. The outermost end of the first electrode lead 613 and the second electrode lead 614 can be connected to the power supply of the liquid crystal Fresnel lens. In this embodiment, the starting position 6117 of the extension segment 6113 and the suspended end of the second conductive line 612 are respectively located on opposite sides of the first electrode lead 613. This allows the first electrode line to reach a position close to the center of the liquid crystal Fresnel lens, thereby electrically connecting to the first position 6111 of the electrode unit 61 near the Fresnel center. With the aforementioned structure, the first electrode lead 613 and the second electrode lead 614 can be led out from the gap between the starting position 6117 of each extension segment 6113 and the suspended end of each second conductive line 612 for connection to the power supply.

[0082] In this embodiment, as an optional but advantageous implementation, the electrode lead group further includes a third electrode lead 615, which extends from the second position 6112 of the first conductive line 611 along the radial direction of the liquid crystal lens to a position connected to the second electrode lead 614. Since the second position 6112 of the first conductive line 611 may be far from the second electrode lead 614, this embodiment connects the second position 6112, located on one side of the first electrode lead 613, to the second electrode lead 614, located on the other side of the first electrode lead 613, by providing the third electrode lead 615.

[0083] As an optional but advantageous implementation, the spacing between adjacent second conductive lines 612 is less than or equal to 100 μm. A more precise potential distribution can be obtained when the spacing between adjacent second conductive lines 612 is less than or equal to 100 μm.

[0084] like Figure 3 As shown, the spacing between adjacent second conductive lines 612 refers to the distance between two adjacent second conductive lines 612 in the radial direction of the Fresnel liquid crystal lens, i.e., the distance d in the figure. As an optional but advantageous embodiment, the spacing between adjacent extension segments 6113 is less than or equal to 100 μm.

[0085] As an optional but advantageous implementation, in this embodiment, a high-resistivity film or a high-dielectric-constant layer is disposed between the second electrode layer 60 and the second alignment layer, or between the second electrode layer 60 and the second transparent substrate. This embodiment achieves a smoother potential between adjacent leads by adding a high-resistivity film or a high-dielectric-constant layer.

[0086] Example 2

[0087] This embodiment provides an electronic product, which includes a control circuit and the Fresnel liquid crystal lens described in Embodiment 1. The control circuit is electrically connected to the Fresnel liquid crystal lens. The electronic product includes, but is not limited to, imaging devices, display devices, mobile phones, AR devices, VR devices, glasses-free 3D products, wearable devices, etc.

[0088] The above is a detailed description of the Fresnel liquid crystal lens and electronic products provided in the embodiments of the present invention.

[0089] It should be clarified that the present invention is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, 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. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of the present invention.

[0090] The functional blocks shown in the above-described structural diagram can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of this invention are programs or code segments used to perform the required tasks. The programs or code segments can be stored on a machine-readable medium or transmitted over a transmission medium or communication link via data signals carried in a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media 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, etc. Code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0091] It should also be noted that the exemplary embodiments mentioned in this invention describe methods or systems based on a series of steps or apparatus. However, this invention is not limited to the order of the steps described above; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0092] The above description is merely a specific embodiment of the present invention. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A Fresnel liquid crystal lens, characterized in that, It includes a first transparent substrate, a first electrode layer, a first alignment layer, a liquid crystal layer, a second alignment layer, a second electrode layer, and a second transparent substrate, which are stacked sequentially. The first electrode layer is a surface electrode; The second electrode layer includes multiple electrode units, which are arranged sequentially from the position closest to the center of the second electrode layer to the position furthest from the center of the second electrode layer; The electrode unit includes a first conductive line and multiple second conductive lines. The first conductive line includes a first position and a second position, which are different from each other. The portion of the first conductive line between the first and second positions has the same width. The first position is used to receive a first driving voltage, and the second position is used to receive a second driving voltage. One end of the second conductive wire is connected to the first conductive wire, and the other end is suspended. The position where the first conductive wire and the second conductive wire are connected is the lead-out position. At least a portion of the lead-out positions are located between the first position and the second position of the first conductive wire, and at least two lead-out positions are different. The first conductive wire includes multiple extension segments, a first connecting segment, and a second connecting segment. Adjacent extension segments are connected by the first connecting segment or the second connecting segment. The multiple extension segments are arranged sequentially from the center of the second electrode layer to the direction away from the center of the second electrode layer. The extension segment extends from the starting position to the position where it is connected to the first connecting segment. The lead-out position is set at the position where the extension segment is connected to the first connecting segment. The starting position of the extension segment is connected to the second connecting segment. For any given electrode unit, let x be the radial distance between the starting position of the extension segment and the first position of that electrode unit. Then the length of the extension segment is g(x), where... C is a constant. This represents the rate of change of the phase of a liquid crystal material with respect to voltage. Each electrode unit in the second electrode layer corresponds to at least one Fresnel ring.

2. The Fresnel liquid crystal lens according to claim 1, characterized in that, When the electrode unit is loaded with a first driving voltage and a second driving voltage, the potential generated by the second conductive line of the electrode unit causes the liquid crystal in the liquid crystal layer to form a phase distribution equivalent to the Fresnel ring corresponding to the electrode unit.

3. The Fresnel liquid crystal lens according to claim 1, characterized in that, The second conductive wire is arc-shaped.

4. The Fresnel liquid crystal lens according to claim 1, characterized in that, The extension of the first conductive wire is arc-shaped.

5. The Fresnel liquid crystal lens according to claims 1 to 1, characterized in that, The starting position and the exit position of at least one of the plurality of extension segments are connected to two adjacent extension segments via a first connecting segment and a second connecting segment, respectively.

6. The Fresnel liquid crystal lens according to claim 1, characterized in that, It also includes an electrode lead assembly, which includes a first electrode lead and a second electrode lead extending from near the center of the second electrode layer toward away from the second electrode layer. One end of the first electrode lead is connected to a first driving voltage, and the other end is electrically connected to a first position of the first conductive line. One end of the second electrode lead is connected to a second driving voltage, and the other end is electrically connected to a second position of the first conductive line. The starting position of the extension segment and the suspended end of the second conductive line are respectively located on opposite sides of the first electrode lead.

7. The Fresnel liquid crystal lens according to claim 6, characterized in that, The electrode lead assembly further includes a third electrode lead, which extends from a second position of the first conductive line along the radial direction of the liquid crystal lens to a position connected to the second electrode lead.

8. The Fresnel liquid crystal lens according to claim 1, characterized in that: The spacing between adjacent second conductive lines is less than or equal to 100 μm.

9. The Fresnel liquid crystal lens according to any one of claims 1 to 8, characterized in that, A high-resistivity film or a high-dielectric-constant layer is disposed between the second electrode layer and the second alignment layer or between the second electrode layer and the second transparent substrate.

10. An electronic product, characterized in that, It includes a control circuit and a Fresnel liquid crystal lens according to any one of claims 1 to 9, wherein the control circuit is electrically connected to the Fresnel liquid crystal lens.

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