Fresnel liquid crystal lens, electronic product and driving method of fresnel liquid crystal lens

Abstract

The application belongs to the technical field of liquid crystal lenses, and specifically relates to a Fresnel liquid crystal lens, an electronic product and a Fresnel liquid crystal lens driving method. 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 first electrode layer is a surface electrode; each electrode unit in the second electrode layer corresponds to at least one Fresnel zone; in a preset area, when the electrode unit is loaded with a first driving voltage and a second driving voltage, the potential generated by the lead-out wire of the electrode unit makes the liquid crystal in the liquid crystal layer form a phase distribution equivalent to the Fresnel zone corresponding to the electrode unit. The application can realize an optical effect closer to an ideal Fresnel liquid crystal lens, and can make excellent optical effects remain stable for a long time.

Description

Technical Field

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

[0002] Liquid crystal lenses are widely used due to their good electrically controlled focusing properties. When the aperture of the liquid crystal lens is large, the required driving voltage will be very high. In the prior art, Fresnel liquid crystal lenses are designed using the principle of Fresnel lenses. For example, the patent with International Publication No.: WO2021113963A1 proposes a Fresnel liquid crystal lens, which uses multiple groups of concentric ring-shaped electrode pairs to realize the Fresnel liquid crystal lens. When two driving voltages are applied to each group of concentric ring pairs, each concentric ring pair generates a certain potential distribution, thereby driving the liquid crystal molecules in the liquid crystal layer to deflect, thereby producing an optical effect similar to the individual Fresnel bands in the Fresnel lens. However, the structure of the aforementioned electrode pairs cannot accurately control the potential distribution between the electrode pairs, so the optical effect produced is still far from the ideal Fresnel lens. Summary of the Invention

[0003] In view of this, the present invention provides a Fresnel liquid crystal lens, an electronic product and a Fresnel liquid crystal lens driving method to solve the technical problem that the existing Fresnel liquid crystal lens has low potential distribution control accuracy and cannot form an ideal Fresnel lens optical effect.

[0004] The technical solution adopted in the present 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 stacked in sequence;

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

[0007] The second electrode layer includes a plurality of electrode units, each of which includes a conductive line and a plurality of lead-out lines. The conductive line includes a first position and a second position, the first position and the second position are different, one end of the lead-out line is connected to the conductive line, and the other end thereof is suspended. The position where the lead-out line is connected to the conductive line is a lead-out position, at least a portion of the lead-out positions is located between the first position and the second position of the conductive line, and at least two lead-out positions are different, the first position is used to receive a first driving voltage, and the second position is used to receive a second driving voltage;

[0008] Each electrode unit in the second electrode layer corresponds to at least one Fresnel zone;

[0009] In a preset area, the resistance values ​​between each lead-out position on the conductive line of the electrode unit and the first position of the electrode unit and the relative distances between the lead-out lines corresponding to each lead-out position in a preset direction are parabolically distributed. When the electrode unit is loaded with the first driving voltage and the second driving voltage, the electric potential generated by the lead-out lines of the electrode unit causes the liquid crystal in the liquid crystal layer to form a phase distribution equivalent to the Fresnel band corresponding to the electrode unit.

[0010] Preferably, in the preset area, the lead wires of each electrode unit are arranged along a preset direction and are parallel to each other.

[0011] Preferably, the width of the portion of the conductive line of the electrode unit located between the second position and the first position is the same, and the length between each lead-out position on the conductive line of the electrode unit to the first position of the electrode unit and the relative distance between the lead-out lines corresponding to each lead-out position in the preset direction are parabolically distributed.

[0012] Preferably, the electrode unit includes a central electrode unit and at least two outer electrode units, and in the preset area, the lead wires of the outer electrode units are located on both sides of the lead wire of the central electrode unit.

[0013] Preferably, the conductive wire of the central electrode unit also includes a third position, the first position is located between the third position and the second position, at least a part of the lead-out position is located between the second position and the third position, and the third position of the conductive wire of the central electrode unit is used to receive a second driving voltage.

[0014] Preferably, the width of the portion of the conductive line of the central electrode unit located between the second position and the third position is the same, and the length between each lead-out position on the conductive line to the first position of the electrode unit and the relative distance between the lead-out lines corresponding to each lead-out position in the preset direction are parabolically distributed.

[0015] Preferably, the central electrode unit further comprises a first electrical connector, the first electrical connector being connected to the conductive wire of the first electrode unit at a first position;

[0016] The portion of the conductive line of the first electrode unit between the first position and the second position is the first sub-portion, and the portion of the conductive line of the first electrode unit between the first position and the third position is the second sub-portion. The first sub-portion and the second sub-portion are respectively located on opposite sides of the first electrical connector.

[0017] Preferably, the lead-out line of the electrode unit includes a first part and a second part respectively located on opposite sides of a first reference plane, and the conductive line of the electrode unit is located on the same side of the first reference plane as the first part or the second part, and the first reference plane is a plane passing through the first position of the central electrode unit and perpendicular to the preset direction.

[0018] Preferably, the lead-out wires of the electrode unit include a first group of lead-out wires and a second group of lead-out wires, the first group of lead-out wires are led out by conductive wires to the first area, and the second group of lead-out wires are led out by conductive wires to the second area, the first area and the second area are distributed on opposite sides of a first reference plane, the first reference plane is a plane through which the first electrode unit passes through the first position and is perpendicular to the first direction, and the conductive wires of the first electrode unit are located in the first area or the second area.

[0019] Preferably, the conductive wire of the electrode unit is bent multiple times to form multiple segments, the lead-out position is located at the bend between two adjacent segments, the width of each segment is the same, and the length of each segment increases linearly from the first position toward the second position.

[0020] Preferably, the conductive line is located outside the functional area of ​​the Fresnel liquid crystal lens.

[0021] Preferably, a high-resistance film or a high dielectric constant layer is provided between the second electrode layer and the second alignment layer or between the second electrode layer and the second transparent substrate.

[0022] In a second aspect, the present invention provides an electronic product, comprising a control circuit and the Fresnel liquid crystal lens described in the first aspect, wherein the control circuit is electrically connected to the Fresnel lens.

[0023] In a third aspect, the present invention provides a method for driving a Fresnel liquid crystal lens, for driving the Fresnel liquid crystal lens described in the first aspect, assuming that a first driving voltage is V1 and a second driving voltage is V2, the method comprising the following steps:

[0024] S1: Obtain the linear response voltage range of the Fresnel liquid crystal lens;

[0025] S2: Obtain the minimum voltage V in the liquid crystal linear working range according to the liquid crystal linear response voltage range. min and the maximum voltage V max ;

[0026] S3: According to the minimum voltage V min and the maximum voltage V max Adjust the voltage difference between V1 and V2 to adjust the optical power of the Fresnel liquid crystal lens and / or switch the positive lens and negative lens states of the liquid crystal lens or liquid crystal lens array, where V min≤V1≤V max , V min ≤V2≤V max .

[0027] Beneficial Effects: The Fresnel liquid crystal lens, electronic product, and Fresnel liquid crystal lens driving method of the present invention utilize the conductive wires of each electrode unit in the second electrode layer to generate a potential that varies in magnitude depending on the position of the conductive wire. Multiple lead wires are then extended from different positions on the non-conductive wire. The lead wires diffuse the potential at the lead-out position of the conductive wire to the area where the lead wires extend, thereby forming a precise parabolic potential distribution within the functional area of ​​the liquid crystal lens. The potential distribution generated by each electrode unit can drive the deflection of liquid crystal molecules, thereby producing an optical effect equivalent to the Fresnel band corresponding to each electrode unit. The present invention utilizes the conductive wires and lead wires to form a highly precise potential distribution, making the optical effect produced by each electrode unit driving the deflection of liquid crystal molecules closer to that of an ideal Fresnel lens. Furthermore, the present invention can generate a highly precise potential distribution without the need for a high-impedance film or a high-dielectric-constant layer. Therefore, the present invention is unaffected by changes in the properties of the high-impedance film or the high-dielectric-constant layer, and its excellent optical effect can be maintained and stabilized over time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work, and these are all within the scope of protection of the present invention.

[0029] Figure 1 is a cross-sectional view of the Fresnel liquid crystal lens of the present invention;

[0030] Figure 2 is a schematic structural diagram of the second electrode layer of the present invention;

[0031] Figure 3 is a schematic diagram of the decomposed structure of the second electrode layer of the present invention;

[0032] Figure 4 is a schematic structural diagram of one of the electrode units of the present invention;

[0033] Figure 5 is a schematic structural diagram of another electrode unit of the present invention;

[0034] Figure 6 Schematic diagram of the potential distribution of Fresnel zones corresponding to each electrode unit of the present invention;

[0035] Figure 7 This is a schematic structural diagram of a conductive wire of an electrode unit of the present invention;

[0036] Figure 8 This is a schematic structural diagram of an electrode unit using half-edge conductive wires in the present invention;

[0037] Figure 9 This is a schematic structural diagram of another electrode unit group using half-edge conductive wires in the present invention;

[0038] Figure 10 Schematic diagram of the potential distribution of each lead wire of the present invention;

[0039] Figure 11 This is a schematic structural diagram of another form of electrode unit of the present invention;

[0040] Figure 12 This is a schematic structural diagram of another form of electrode unit of the present invention;

[0041] Figure 13 This is a schematic structural diagram of another form of electrode unit of the present invention;

[0042] Figure 14 This is a schematic structural diagram of another form of electrode unit of the present invention;

[0043] Figure 15 This is a schematic structural diagram of another form of electrode unit of the present invention;

[0044] Figure 16 Schematic diagram of the process of driving the liquid crystal lens or liquid crystal lens array of the present invention;

[0045] Figure 17 The interference ripple pattern of the Fresnel liquid crystal cylindrical lens of the present invention;

[0046] Figure 18 Schematic diagram of the relative distances between lead wires in an electrode unit of the present invention.

[0047] Description of reference numerals:

[0048] Liquid crystal lens 100, first transparent substrate 10, first electrode layer 20, first alignment layer 30, liquid crystal layer 40, second alignment layer 50, second electrode layer 60, conductive line 61, first position 611, second position 612, third position 613, first sub-section 614, second sub-section 615, first group of lead wires 616, second group of lead wires 617, lead wires 62, reference lead wires 620, first electrical connection 63, second transparent substrate 70, reference plane 80, electrode unit 90. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments 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" and the like is based on the orientation or position relationship shown in the accompanying drawings, and 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 operate in a specific orientation, and therefore cannot be understood as limiting the present invention. Moreover, the term "comprises", "includes" 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 process, method, article or device. In the absence of further limitations, elements defined by the phrase "comprising..." do not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising the elements. The embodiments of the present invention and the features thereof may be combined with each other if there is no conflict, and all are within the scope of protection of the present invention.

[0050] Example 1

[0051] like Figure 1 As shown, this embodiment provides a Fresnel liquid crystal lens, which includes a liquid crystal layer 40, a first alignment layer 30, a second alignment layer 50, a first electrode layer 20, a second electrode layer 60, a first transparent substrate 10, and a second transparent substrate 70, wherein the first alignment layer 30 and the second alignment layer 50 are respectively located on opposite sides of the liquid crystal layer 40, wherein the first electrode layer 20 is located on the side of the first alignment layer 30 facing away from the liquid crystal layer 40, wherein the second electrode layer 60 is located on the side of the second alignment layer 50 facing away from the liquid crystal layer 40; wherein the first transparent substrate 10 is located on the side of the first electrode layer 20 facing away from the liquid crystal layer 40, wherein the second transparent substrate 70 is located on the side of the second electrode layer 60 facing away from the liquid crystal layer 40;

[0052] The Fresnel liquid crystal lens in this embodiment can adopt a layered structure. The liquid crystal layer 40, the first alignment layer 30, the second alignment layer 50, the first electrode layer 20, the second electrode layer 60, the first transparent substrate 10 and the second transparent substrate 70 are respectively located in different layers, and the aforementioned layers are stacked and arranged along the normal direction of each layer of the Fresnel liquid crystal lens. The arrangement method can be seen in Figure 1 As shown, in Figure 1 Along the normal direction of each layer of the liquid crystal lens, there are the first transparent substrate 10, the first electrode layer 20, the first orientation layer 30, the liquid crystal layer 40, the second orientation layer 50, the second electrode layer 60 and the second transparent substrate 70. The first transparent substrate 10 and the second transparent substrate 70 can be made of transparent materials with a certain strength and rigidity, such as a glass substrate, a plastic substrate, etc. The first substrate can play a role in supporting the liquid crystal lens. The first transparent substrate 10 can serve as a carrier of the first electrode layer 20, and the first electrode layer 20 can be plated on the first substrate. The second substrate also plays a supporting role and can also serve as a carrier of the second electrode layer 60, and the second electrode layer 60 can be plated on the second transparent substrate 70. The first electrode layer 20 is a surface electrode, and the first electrode layer 20 can form a plane with equipotential.

[0053] like Figure 2 and Figure 3 As shown, the second electrode layer 60 includes a plurality of electrode units 90. The aforementioned plurality of electrode units 90 means that the number of electrode units 90 in the second electrode layer 60 is 2 or more.

[0054] like Figure 4 and Figure 5 As shown, the electrode unit 90 includes a conductive wire 61 and a plurality of lead wires 62, the conductive wire 61 includes a first position and a second position, the first position and the second position are different, one end of the lead wire 62 is connected to the conductive wire 61, and the other end is suspended, the position where the lead wire 62 is connected to the conductive wire 61 is the lead position, at least a part of the lead position is located between the first position and the second position of the conductive wire 61, and at least two lead positions are different, as shown in FIG. Figure 2 As shown, the first position is used to receive a first driving voltage, and the second position is used to receive a second driving voltage;

[0055] The number of lead wires 62 can be greater than or equal to 2. The lead-out position of each lead wire 62 can be the same or different. The lead wires 62 can be made of transparent material in whole or in part. The conductive wire 61 in this embodiment can be a wire with a certain resistance, or a thinner line with a certain resistance and conductivity plated on the second substrate. The conductive wire 61 can be made of transparent conductive material, and the aforementioned transparent conductive material includes but is not limited to ITO electrode material, IZO electrode material, FTO electrode material, AZO electrode material, IGZO electrode material, etc. For one of the electrode units, a first driving voltage and a second driving voltage can be applied to two different positions on the conductive wire 61, namely a first position 611 and a second position 612, respectively. When the aforementioned two driving voltages are applied to the conductive wire 61, different potentials are distributed at different positions on the conductive wire 61. Because one end of the lead wire 62 in this embodiment is connected to the conductive wire 61, while the other end is suspended, the potential at each location on the same lead wire 62 is equal and equal to the potential of the conductive wire 61 at the location where the lead wire 62 connects to the conductive wire 61. This allows us to obtain the desired potential for each lead wire 62 by configuring the lead-out location of each lead wire 62. We can extend each lead wire 62 to specific locations as needed, and control the potential distribution at these locations by using the potential on the lead wire 62. For example, we can extend the lead wire 62 to an area where the electric field it generates can drive the deflection of liquid crystal molecules in a liquid crystal optical device. In actual applications, only a portion of the lead wire 62 may be used to control the potential distribution, so we can configure the position of only this portion. Of course, we can also configure the position of all portions of the lead wire 62 as needed, without limitation.

[0056] According to the design and processing principles of Fresnel lenses, the curvature of the optical surface determines the imaging characteristics in optical imaging. In optical lens design, the surface curvature can be maintained constant, while the surface thickness can be reduced during processing. This design allows the lens to still converge light, focusing incident light onto its surface to a focal point. In actual lens processing and application, a spherical lens can be considered as several discrete components, with excess material removed between the components. During processing, the original surface curvature is maintained, without affecting light deflection. The functions of these discrete components are performed by a series of Fresnel strips within the Fresnel lens. This embodiment can also utilize a liquid crystal lens to achieve an effect equivalent to that of a Fresnel lens. Since traditional Fresnel lenses consist of a series of Fresnel strips, this embodiment utilizes individual electrode units 90 to achieve the corresponding optical effects of each Fresnel strip within the Fresnel lens. The combined effects of all electrode units 90 are equivalent to the overall optical effect of a single Fresnel lens. We have previously introduced that the lead wires 62 extending from the conductive wires 61 can be used to control the potential distribution. In order to enable the liquid crystal layer to produce an optical effect equivalent to the Fresnel band corresponding to the electrode unit 90 under the action of the electrode unit 90, in a preset area, the resistance value between each lead-out position on the conductive wire 61 of the electrode unit 90 and the first position of the electrode unit 90 and the relative distance between the lead wires 62 corresponding to each lead-out position in the preset direction are parabolically distributed. When the electrode unit 90 is loaded with the first driving voltage and the second driving voltage, the potential generated by the lead wires 62 of the electrode unit 90 causes the liquid crystal in the liquid crystal layer to form a phase distribution equivalent to the Fresnel band corresponding to the electrode unit 90.

[0057] Here, the phase distribution equivalent to the Fresnel band means that when the liquid crystal layer forms the aforementioned phase distribution, the modulation effect on light is equivalent to the modulation effect of the corresponding Fresnel band on light. Figure 6 As shown, this embodiment utilizes the parabolic distribution of the resistance between each lead-out position on the conductive wire 61 of the electrode unit 90 and the first position of the electrode unit 90, and the relative distance in a preset direction between the lead-out lines 62 corresponding to each lead-out position, to generate a parabolic electric field. Under the action of this parabolic electric field, the liquid crystal molecules in the corresponding region of the liquid crystal layer are deflected, causing the wavefront distribution of light passing through the corresponding region of the liquid crystal layer to also conform to a parabolic distribution, thereby achieving the optical effect of the corresponding Fresnel zone. Because the optical effects of different Fresnel zones in the same Fresnel lens can vary, and the optical effects of different Fresnel zones in Fresnel lenses of different designs can also vary, the specific shape of the parabola corresponding to the lead-out lines 62 of each electrode unit 90 can also vary. The specific shape can be set based on the parabolic shape of the corresponding Fresnel zone that achieves the same effect, and this is not limited here.

[0058] The aforementioned preset direction can be arbitrarily specified as needed. For example, when it is necessary to control the potential distribution of each position in a certain direction in the space where the liquid crystal lens is located, the direction can be specified as the preset direction, for example Figure 18 The x direction in . Figure 18 As shown, the x direction in FIG18 represents the preset direction, and D1, D2, and D3 represent relative distances. For a group of lead lines belonging to the same electrode unit, we can use the lead line that is arranged at the front or back in the preset direction as the reference lead line 620, for example Figure 18 The first lead line in the diagram is taken as the origin, that is, the relative distance between the lead line and itself is 0, and the distance between other lead lines and the reference lead line is taken as the aforementioned relative distance, for example Figure 18 The distance D1 between the second extension line and the reference lead line is the relative distance of the lead line, the distance D2 between the third lead line and the reference lead line is the relative distance of the lead line, and the distance D3 between the fourth lead line and the reference lead line is the relative distance of the lead line. Similarly, the relative distances of the lead lines in this electrode unit can be obtained by analogy. Since relative distances are used in this embodiment, these lead lines can be arbitrarily translated as a whole during configuration. The resistance values ​​between each lead-out position on the conductive wire 61 of the aforementioned electrode unit 90 and the first position of the electrode unit 90 and the relative distances between the lead-out lines 62 corresponding to each lead-out position in the preset direction are parabolically distributed, which means that a rectangular coordinate system is established with the resistance values ​​between the lead-out position and the first position 611 and the relative distances between the lead-out lines corresponding to each lead-out position in the preset direction as coordinate axes, respectively. In this rectangular coordinate system, the curve representing the corresponding relationship between the resistance values ​​between each lead-out position on the conductive wire 61 and the first position 611 and the relative distances between the lead-out lines corresponding to each lead-out position in the preset direction is a parabola.

[0059] like Figure 10 As shown, for any electrode unit in the second electrode layer, a rectangular coordinate system is established with the first position 611 as the origin, the preset direction as the x-axis, and the potential magnitude as the y-axis, where the coordinate of the x-axis represents the distance from at least a portion of each lead line 62 to the first position 611 in the preset direction. When the first drive voltage and the second drive voltage are applied, the resistance value between each lead position and the first position 611 is proportional to the potential of the lead position. Therefore, when the resistance value between each lead position on the conductive line 61 of the electrode unit 90 and the first position of the electrode unit 90 and the relative distance between the lead lines 62 corresponding to each lead position in the preset direction are parabolically distributed, the potential distribution formed by the lead lines 6262 in the preset area in the preset direction is a parabolic distribution.

[0060] As one embodiment, in the preset area, the lead wires 62 of each electrode unit 90 are arranged along a preset direction and are parallel to each other. In this way, in the preset area, the potential is distributed in a parabolic shape along the direction of the lead wires 62, thereby obtaining a Fresnel liquid crystal rod lens. The lens effect of the Fresnel liquid crystal rod lens in this embodiment is shown in FIG. Figure 17 In this embodiment, the width of the portion of the conductive line 61 of the electrode unit located between the second position 612 and the first position 611 is the same, and the length of the conductive line 61 from each lead-out position to the first position 611, the length from each lead-out position to the first position of the electrode unit, and the relative distance between the lead-out lines 62 corresponding to each lead-out position in a preset direction are parabolically distributed.

[0061] Since the resistance value between each lead-out position on the conductive line 61 and the first position 611 is proportional to the length between each lead-out position on the conductive line 61 and the first position 611 when the width of the conductive line 61 is the same, this embodiment can also achieve a parabolic distribution of the potential distribution formed by the lead-out line 62 in the first direction in the preset area by making the length between each lead-out position on the conductive line 61 and the first position 611 in the preset area and the relative distance between the lead-out lines 62 corresponding to each lead-out position in the preset direction parabolic. This embodiment can also adopt Figures 11 to 15 Any of the electrode units in the above embodiment can be used to generate a parabolic potential distribution.

[0062] like Figure 8 and Figures 11 to 14 As shown, in this embodiment, the conductive wire 61 is bent multiple times to form a plurality of segments, the lead-out position is located at the bend between two adjacent segments, and the projections of the lead-out positions in the first direction are staggered. The widths of the segments are the same, and the segments are linearly increased in sequence from the first position 611 toward the second position 612. Alternatively, the widths of the segments are the same, and the segments between the first position 611 and the second position 612 are linearly increased in sequence from the first position 611 toward the second position 612, and the segments between the first position 611 and the third position 613 are linearly increased in sequence from the first position 611 toward the third position 613. The aforementioned method can also be used to make the electrode unit produce a parabolic potential distribution.

[0063] In this embodiment, the electrode unit 90 includes a central electrode unit 90 and at least two outer electrode units 90. Within the predetermined region, the lead lines 62 of the outer electrode units 90 are located on either side of the lead line 62 of the central electrode unit 90. With the aforementioned structure, the Fresnel zones of the Fresnel lens of this embodiment can be arranged sequentially from the center to the sides.

[0064] like Figure 5 As shown, as one of the implementation methods, in this embodiment, the conductive wire 61 of the central electrode unit also includes a third position 613, the first position 611 is located between the third position 613 and the second position 612, at least a part of the lead-out position is located between the second position 612 and the third position 613, and the third position 613 of the conductive wire 61 of the central electrode unit is used to receive a second driving voltage.

[0065] In this embodiment, a third position 613 for applying a driving voltage is added to the second position 612 of the aforementioned intermediate electrode unit. The third position 613 of the central electrode unit 911 is used to apply a second driving voltage. This allows the second driving voltage to be applied simultaneously to the second and third positions 612, 613 of the conductive wire 61. When the second driving voltage is applied simultaneously to the second and third positions 612, 613 of the conductive wire 61, a position-dependent electric potential is generated between the second position 612 and the first position 611, and between the third position 613 and the first position 611. The lead wires 62 can be extended from either side of the first position 611, i.e., the lead wires can be located either between the second position 612 and the first position 611, or between the third position 613 and the first position 611. With this structure, the lead wires 62 on either side of the first position 611 can be used to control the electric potential distribution on both sides of the first position 611, and a bilaterally symmetrical electric potential distribution can be achieved.

[0066] Since the resistance value between each lead-out position on the conductive wire 61 and the first position 611 is proportional to the length between each lead-out position on the conductive wire 61 and the first position 611 when the width of the conductive wire 61 is the same, the width of the portion of the conductive wire 61 of the central electrode unit 90 located between the second position and the third position is the same in this embodiment, and the length between each lead-out position on the conductive wire 61 and the first position of the electrode unit 90 and the relative distance between the lead-out lines 62 corresponding to each lead-out position in the preset direction are parabolically distributed.

[0067] like Figure 7 As shown, in this embodiment, the central electrode unit further includes a first electrical connector 63, which is connected to the conductive wire 61 at a first position 611; in this embodiment, a first driving voltage is applied to the first position 611 of the conductive wire 61 through the first electrical connector 63.

[0068] The portion of the conductive wire 61 of the first electrode unit between the first position 611 and the second position 612 is a first sub-portion 614, and the portion of the conductive wire 61 between the first position 611 and the third position 613 is a second sub-portion 615. The first sub-portion 614 and the second sub-portion 615 are located on opposite sides of the first electrical connector 63. To facilitate the extension of the first electrical connector 63 from the first position 611 of the conductive wire 61, this embodiment positions the two portions of the conductive wire 61, namely the first sub-portion 614 and the second sub-portion 615, on either side of the first electrical connector 63. This allows for the generation of position-dependent potentials on both sides of the first position 611 while avoiding the first electrical connector 63, facilitating the application of the first driving voltage.

[0069] like Figure 8 As shown, the lead wire 62 of the electrode unit 90 includes a first portion and a second portion located on opposite sides of a first reference plane, wherein the first reference plane is a plane passing through the first position of the central electrode unit 90 and perpendicular to the preset direction. Figure 8 As shown, the space where the liquid crystal lens is located is divided into two areas with the first reference plane 80 as the boundary, wherein the lead wire 62 can span the two areas. In this way, the potential distribution of the two areas can be controlled by the same conductive wire 61, thereby shortening the length of the conductive wire 61 by half, and significantly reducing the production cost and energy consumption of the liquid crystal lens.

[0070] In order to save control, in this embodiment, the conductive line 61 of the electrode unit 90 is located on the same side of the first reference plane as the first part or the second part, so that the conductive line 61 only needs to occupy one area to control the potential distribution of the two areas.

[0071] In this embodiment, the lead wires 62 of the electrode unit 90 include a first group of lead wires 62 and a second group of lead wires 62. The first group of lead wires 62 are led from the conductive wires 61 to the first area, and the second group of lead wires 62 are led from the conductive wires 61 to the second area. The first area and the second area are distributed on opposite sides of a first reference plane. The first reference plane is a plane through which the first electrode unit 90 passes through the first position and is perpendicular to the first direction. Figure 9 As shown, this embodiment divides the lead wires 62 into two groups. Both groups of lead wires 62 extend from the same conductive wire 61 and extend to the first and second regions, respectively. This approach allows the potential distribution in both regions to be controlled by applying a drive voltage at only two locations. Furthermore, the length of the conductive wires 61 can be shortened by half, significantly reducing the manufacturing cost and energy consumption of the liquid crystal lens. The conductive wires of the electrode unit can be located only in the first or second region to save space.

[0072] As a preferred embodiment, in this embodiment, the conductive wire 61 is located outside the functional area of ​​the Fresnel liquid crystal lens. The functional area of ​​the Fresnel liquid crystal lens refers to the area within the liquid crystal lens that can modulate light as needed. In the prior art, the same component is typically used to generate different potentials and control their distribution. Since this component is used to control the potential distribution, it is typically located within the functional area of ​​the Fresnel liquid crystal lens. However, with this approach, the component generating different potentials is limited by the functional area, making it difficult to meet the potential control requirements. In contrast, this embodiment separates the component generating the potential distribution (i.e., the conductive wire 61 in this embodiment) from the component controlling the potential distribution (i.e., the lead wire 62 in this embodiment). The component generating the potential distribution is located outside the functional area, while at least a portion of the component controlling the potential is located within the functional area of ​​the Fresnel liquid crystal lens. This allows the component generating the potential distribution to be free from the size and shape of the functional area, facilitating precise design of the conductive wire 61, while also ensuring that the component generating the potential distribution and the functional area do not interfere with each other.

[0073] In addition, this embodiment may further include a high-impedance film or a high-dielectric constant layer. To smooth the potential between adjacent lead lines 62 in the first electrode layer 20, the high-impedance film or the high-dielectric constant layer may be disposed between the first electrode layer 20 and the first alignment layer, or between the first electrode layer 20 and the first transparent substrate. To smooth the potential between adjacent lead lines 62 in the second electrode layer 60, the high-impedance film or the high-dielectric constant layer may be disposed between the second electrode layer 60 and the second alignment layer, or between the second electrode layer 60 and the second transparent substrate.

[0074] Example 2

[0075] like Figure 16 As shown, this embodiment provides a Fresnel liquid crystal lens driving method, which is used to drive the Fresnel liquid crystal lens described in Example 1. Assuming that the first driving voltage is V1 and the second driving voltage is V2, the method includes the following steps:

[0076] S1: Obtaining a linear response voltage range of the Fresnel liquid crystal lens; wherein the liquid crystal linear operating range refers to a voltage range in which the liquid crystal phase delay amount and the driving voltage are in a linear relationship.

[0077] S2: Obtain the minimum voltage V in the liquid crystal linear working range according to the liquid crystal linear response voltage range. min and the maximum voltage V max ;

[0078] S3: According to the minimum voltage V min and the maximum voltage V maxAdjust the voltage difference between V1 and V2 to adjust the optical power of the Fresnel liquid crystal lens and / or switch the positive lens and negative lens states of the liquid crystal lens or liquid crystal lens array, where V min ≤V1≤V max , V min ≤V2≤V max When the first driving voltage V1 and the second driving voltage V2 are applied to each electrode unit of the Fresnel liquid crystal lens in this embodiment, the leads of each electrode unit generate corresponding parabolic potentials in predetermined areas. These parabolic potentials deflect the liquid crystal molecules in the corresponding areas, thereby achieving light modulation equivalent to that of the corresponding Fresnel bands in the liquid crystal layer. This step adjusts the optical power of the Fresnel liquid crystal lens by adjusting the values ​​of V1 and V2. The adjustment can be performed by keeping V1 constant while adjusting V2, keeping V1 constant while adjusting V2, or changing both V1 and V2 simultaneously. When keeping V1 constant while adjusting V2, V1 can be set to Vmin or V1 = Vmax while adjusting V2. When keeping V2 constant while adjusting V1, V2 can be set to Vmin or V2 = Vmax while adjusting V1. Furthermore, this embodiment can switch between positive and negative lens states by changing the relationship between V1 and V2. When the value of V1-V2 changes, the potential distribution generated by each electrode unit also changes under the premise of satisfying the parabolic distribution, thereby causing the optical focal length of the entire Fresnel liquid crystal lens to change, or causing the Fresnel liquid crystal lens to switch between a positive lens state and a negative lens state.

[0079] Example 3

[0080] This embodiment provides an electronic product, comprising a control circuit and the liquid crystal lens described in any one of Embodiment 1, wherein the control circuit is electrically connected to the liquid crystal lens or liquid crystal lens array. 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.

[0081] The above is a detailed introduction to the liquid crystal lens driving method, apparatus, device, and storage medium provided by embodiments of the present invention. It should be understood that the present invention is not limited to the specific configurations and processes described above and illustrated in the figures. For the sake of brevity, detailed descriptions of known methods are omitted. In the above embodiments, several specific steps are described and illustrated as examples. However, the method of the present invention is not limited to the specific steps described and illustrated. Those skilled in the art may, after understanding the spirit of the present invention, make various changes, modifications, and additions, or change the order of the steps.

[0082] 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, 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 the present invention are programs or code segments used to perform the required tasks. The programs or code segments can be stored in a machine-readable medium or transmitted over a transmission medium or communication link via a data signal 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, ROMs, flash memory, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segments can be downloaded via a computer network such as the Internet or an intranet. 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. In other words, the steps can be performed in the order mentioned in the embodiments, or in a different order than that in the embodiments, or several steps can be performed simultaneously.

[0083] The above description is only a specific embodiment of the present invention. Those skilled in the art will clearly understand that for the convenience and brevity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any person skilled in the art 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 included in 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 stacked in sequence; The first electrode layer is a surface electrode; The second electrode layer includes a plurality of electrode units, each of which includes a conductive line and a plurality of lead-out lines. The conductive line includes a first position and a second position, the first position and the second position are different, one end of the lead-out line is connected to the conductive line, and the other end thereof is suspended. The position where the lead-out line is connected to the conductive line is a lead-out position, at least a portion of the lead-out positions is located between the first position and the second position of the conductive line, and at least two lead-out positions are different, the first position is used to receive a first driving voltage, and the second position is used to receive a second driving voltage; Each electrode unit in the second electrode layer corresponds to at least one Fresnel zone; In a preset area, the resistance values ​​between each lead-out position on the conductive line of the electrode unit and the first position of the electrode unit and the relative distances between the lead-out lines corresponding to each lead-out position in a preset direction are parabolically distributed. When the electrode unit is loaded with the first driving voltage and the second driving voltage, the electric potential generated by the lead-out lines of the electrode unit causes the liquid crystal in the liquid crystal layer to form a phase distribution equivalent to the Fresnel band corresponding to the electrode unit.

2. The Fresnel liquid crystal lens according to claim 1, wherein: In the preset area, the lead wires of each electrode unit are arranged along a preset direction and are parallel to each other.

3. The Fresnel liquid crystal lens according to claim 1, wherein: The width of the portion of the conductive line of the electrode unit located between the second position and the first position is the same, and the length between each lead-out position on the conductive line of the electrode unit to the first position of the electrode unit and the relative distance between the lead-out lines corresponding to each lead-out position in a preset direction are parabolically distributed.

4. The Fresnel liquid crystal lens according to claim 1, wherein: The electrode unit includes a central electrode unit and at least two outer electrode units. In the preset area, the lead wires of the outer electrode units are located on both sides of the lead wire of the central electrode unit.

5. The Fresnel liquid crystal lens according to claim 4, wherein: The conductive line of the central electrode unit also includes a third position, the first position is located between the third position and the second position, at least a part of the lead-out position is located between the second position and the third position, and the third position of the conductive line of the central electrode unit is used to receive a second driving voltage.

6. The Fresnel liquid crystal lens according to claim 5, wherein: The width of the portion of the conductive line of the central electrode unit between the second position and the third position is the same, and the length between each lead-out position on the conductive line to the first position of the electrode unit and the relative distance between the lead-out lines corresponding to each lead-out position in the preset direction are parabolically distributed.

7. The liquid crystal lens according to claim 6, wherein: The central electrode unit further includes a first electrical connector connected to the conductive wire of the central electrode unit at a first position; The portion of the conductive line of the central electrode unit between the first position and the second position is the first sub-portion, and the portion of the conductive line of the central electrode unit between the first position and the third position is the second sub-portion. The first sub-portion and the second sub-portion are respectively located on opposite sides of the first electrical connector.

8. The Fresnel liquid crystal lens according to claim 4, wherein: The lead wire of the electrode unit includes a first part and a second part respectively located on opposite sides of a first reference plane, and the conductive wire of the electrode unit is located on the same side of the first reference plane as the first part or the second part. The first reference plane is a plane passing through the first position of the center electrode unit and perpendicular to the preset direction.

9. The Fresnel liquid crystal lens according to claim 4, wherein: The lead-out wires of the electrode unit include a first group of lead-out wires and a second group of lead-out wires, the first group of lead-out wires are led out by conductive wires to the first area, and the second group of lead-out wires are led out by conductive wires to the second area, the first area and the second area are distributed on opposite sides of a first reference plane, the first reference plane is a plane passing through the first position of the electrode unit and perpendicular to a preset direction, and the conductive wires of the electrode unit are located in the first area or the second area.

10. The Fresnel liquid crystal lens according to claim 1, wherein: The conductive wire of the electrode unit is bent multiple times to form multiple segments, the lead-out position is located at the bend between two adjacent segments, the width of each segment is the same, and the length of each segment increases linearly from the first position toward the second position.

11. The Fresnel liquid crystal lens according to any one of claims 1 to 10, characterized in that: The conductive line is located outside the functional area of ​​the Fresnel liquid crystal lens.

12. The Fresnel liquid crystal lens according to any one of claims 1 to 10, characterized in that: A high-resistance film or a high-dielectric-constant layer is provided between the second electrode layer and the second alignment layer or between the second electrode layer and the second transparent substrate.

13. Electronic product, characterized in that, The device comprises a control circuit and the Fresnel liquid crystal lens according to any one of claims 1 to 12, wherein the control circuit is electrically connected to the Fresnel liquid crystal lens.

14. A method for driving a Fresnel liquid crystal lens, characterized in that: For driving the Fresnel liquid crystal lens according to any one of claims 1 to 12, assuming that the first driving voltage is V1 and the second driving voltage is V2, the method comprises the following steps: S1: Obtain the linear response voltage range of the Fresnel liquid crystal lens; S2: Obtain the minimum voltage V in the liquid crystal linear working range according to the liquid crystal linear response voltage range. min and the maximum voltage V max ; S3: According to the minimum voltage V min and the maximum voltage V max Adjust the voltage difference between V1 and V2 to adjust the optical power of the Fresnel liquid crystal lens and / or switch the positive lens and negative lens states of the liquid crystal lens or liquid crystal lens array, where V min ≤V1≤V max , V min ≤V2≤V max .

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