Spliced ​​liquid crystal lens, electronic device and method for driving the spliced ​​liquid crystal lens

Abstract

The present invention belongs to the field of optical imaging technology, and provides a spliced ​​liquid crystal lens, an electronic device, and a method for driving a spliced ​​liquid crystal lens. The spliced ​​liquid crystal lens comprises: at least two rectangular light-through hole liquid crystal lens units and a driving circuit, each of the rectangular light-through hole liquid crystal lens units is arranged in an array and spliced ​​into a large-caliber liquid crystal lens, the rectangular light-through hole liquid crystal lens unit comprises: a first electrode, a second electrode, a third electrode, and a fourth electrode, and a rectangular light-through hole in the light-through direction surrounded by the first electrode, the second electrode, the third electrode, and the fourth electrode, and the driving circuit outputs a driving voltage to the first electrode, the second electrode, the third electrode, and the fourth electrode of each rectangular light-through hole liquid crystal lens unit to adjust the optical axes of each rectangular light-through hole liquid crystal lens unit to a mutually overlapping position. The spliced ​​liquid crystal lens of the present invention has the advantages of large caliber, thin thickness, and fast response speed.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging, and in particular to a spliced ​​liquid crystal lens, an electronic device and a method for driving the spliced ​​liquid crystal lens. Background Art

[0002] At present, large-aperture adjustable lenses are often required in application scenarios such as VR, imagers, and adaptive glasses. The current liquid crystal lens electrically controlled focusing technology utilizes the anisotropy of liquid crystal materials to deflect liquid crystal molecules through a specific non-uniform electric field distribution to form a specific arrangement state, modulate the incident light, and thus realize a liquid crystal optical device similar to a glass lens effect. Ideally, the liquid crystal lens is an equivalent flat plate when not powered on, does not deflect light, and has no effect on the image quality; when the liquid crystal lens is powered on, the area inside the circular hole electrode is the lens area, which is responsible for focusing, and the area outside the circular hole does not deflect light, and the imaging effect remains unchanged. Since liquid crystal lenses can easily achieve dynamic focusing, liquid crystal lenses have certain advantages in being used as large-aperture adjustable lenses.

[0003] However, for liquid crystal lenses, the thickness of the liquid crystal cell d is proportional to the square of the lens radius r, and the response time τ is proportional to the square of d, so τ is proportional to the fourth power of r. Therefore, due to the large radius r of high-quality large liquid crystal lenses, the thickness of the liquid crystal cell becomes larger, the response speed becomes very slow, and the application effect is not good, which limits the application of liquid crystal lenses in large-diameter adjustable lenses.

[0004] Currently, there is also a form of liquid crystal microlens array, which arranges multiple liquid crystal microlenses with circular through holes in the form of an array. However, in this method, the optical axis positions of each liquid crystal microlens are not the same, so a large-aperture liquid crystal lens cannot be formed, and the imaging effect of a large-aperture liquid crystal lens cannot be achieved. Summary of the invention

[0005] In view of this, the embodiments of the present invention provide a spliced ​​liquid crystal lens, an electronic device and a method for driving the spliced ​​liquid crystal lens, so as to solve the technical problems of large-aperture liquid crystal lenses in the prior art, such as large thickness and slow response speed.

[0006] The technical solution adopted by the present invention is:

[0007] In a first aspect, the present invention provides a spliced ​​liquid crystal lens, the spliced ​​liquid crystal lens comprising: at least two rectangular light-through hole liquid crystal lens units and a driving circuit, each of the rectangular light-through hole liquid crystal lens units is arranged in an array and spliced ​​into a large-aperture liquid crystal lens, the rectangular light-through hole liquid crystal lens unit comprises: a first electrode, a second electrode, a third electrode and a fourth electrode, and a rectangular light-through hole in a light-through direction surrounded by the first electrode, the second electrode, the third electrode and the fourth electrode, the driving circuit outputs a driving voltage to the first electrode, the second electrode, the third electrode and the fourth electrode of each rectangular light-through hole liquid crystal lens unit, so as to adjust the optical axes of each rectangular light-through hole liquid crystal lens unit to a position where they overlap with each other.

[0008] Preferably, the rectangular light-through hole liquid crystal lens unit includes a first substrate, a first electrode layer, a first high-impedance film layer, a first alignment layer, a liquid crystal layer, a second alignment layer, a second high-impedance film layer, a second electrode layer and a second substrate which are stacked in sequence, the first electrode and the second electrode are located in the first electrode layer, the first electrode and the second electrode are arranged opposite to each other, the third electrode and the fourth electrode are located in the second electrode layer, and the third electrode layer and the fourth electrode layer are arranged opposite to each other.

[0009] Preferably, the rectangular light-through hole liquid crystal lens unit includes a first substrate, a first electrode layer, a first alignment layer, a liquid crystal layer, a second alignment layer, a second electrode layer and a second substrate which are stacked in sequence, the first electrode and the second electrode are located in the first electrode layer, the first electrode layer also includes a first high-impedance film, the first electrode and the second electrode are arranged at opposite ends of the first high-impedance film, the third electrode and the fourth electrode are located in the second electrode layer, the second electrode layer also includes a second high-impedance film, and the third electrode and the fourth electrode are arranged at opposite ends of the second high-impedance film.

[0010] Preferably, the driving circuit comprises sub-driving circuits corresponding to the rectangular light-through-hole liquid crystal lens units one by one, and each sub-driving circuit can independently drive the corresponding rectangular light-through-hole liquid crystal lens unit.

[0011] Preferably, the sub-driving circuit includes a first driving voltage unit for applying a driving voltage to the first electrode, a second driving voltage unit for applying a driving voltage to the second electrode, a third driving voltage unit for applying a driving voltage to the third electrode, and a fourth driving voltage unit for applying a driving voltage to the fourth electrode.

[0012] Preferably, the plurality of rectangular light-through-hole liquid crystal lens units are arranged in an m×k array, m≠k, wherein one of m and k is a positive integer greater than or equal to 1, and the other is a positive integer greater than or equal to 2.

[0013] In a second aspect, the present invention further provides an electronic device, comprising the spliced ​​liquid crystal lens described in the first aspect.

[0014] In a third aspect, the present invention further provides a method for driving the spliced ​​liquid crystal lens according to the first aspect, comprising the following steps:

[0015] S1: Obtain the target optical axis position of the spliced ​​liquid crystal lens;

[0016] S2: Obtaining the initial optical axis position and initial voltage parameters of each rectangular light-through hole liquid crystal lens unit;

[0017] S3: determining the target voltage parameter of each rectangular light-through hole liquid crystal lens according to the initial optical axis position, initial voltage parameter and the target optical axis position of each rectangular light-through hole liquid crystal lens unit;

[0018] S4: driving the corresponding rectangular light-through-hole liquid crystal lens unit according to the target voltage parameters of each rectangular light-through-hole liquid crystal lens unit.

[0019] Preferably, the initial voltage parameters of the rectangular light-through hole liquid crystal lens unit include an initial voltage amplitude v1 applied to the first electrode, an initial phase The initial voltage amplitude v2 and initial phase v2 applied to the second electrode The initial voltage amplitude and initial phase applied to the third electrode The initial voltage amplitude v4 and initial phase v4 applied to the fourth electrode The target voltage parameters include a target voltage amplitude v applied to the first electrode 1a , target phase The target voltage amplitude v applied to the second electrode 2a , target phase The target voltage amplitude v applied to the third electrode 3a , target phase The target voltage amplitude v applied to the fourth electrode 4a , target phase in, The S3 includes:

[0020] The S3 includes:

[0021] S31: establishing a rectangular coordinate system with the initial optical axis position of the rectangular light-through hole liquid crystal lens unit as the coordinate origin;

[0022] S32: Obtain the coordinates (ox, oy) of the target optical axis position in the coordinate system

[0023] S33: Calculate the target voltage parameter according to the following formula:

[0024]

[0025]

[0026]

[0027]

[0028]

[0029] v 2a =v 1a t 21a

[0030]

[0031] v 4a =v 3a t 43a

[0032] Preferably, the plurality of rectangular light-through hole liquid crystal lens units are arranged in a c×e array, one of c and e is an odd number greater than or equal to 1, and the other is an odd number greater than or equal to 2. In S1, the target optical axis position is the position of the optical axis of the rectangular light-through hole liquid crystal lens unit at the center of the array.

[0033] Beneficial effects: The spliced ​​liquid crystal lens of the present invention utilizes a plurality of rectangular light-through hole liquid crystal lens units with smaller apertures to be spliced ​​together into a liquid crystal lens with a larger aperture by means of splicing and combining. The rectangular light-through hole liquid crystal lens unit has the characteristic of being able to adjust the optical axis position, and the optical axes of each rectangular light-through hole liquid crystal lens unit are adjusted to the same position through a driving circuit to form a large-aperture liquid crystal lens. Since the aperture of each rectangular light-through hole liquid crystal lens unit used for splicing is relatively small, the thickness of each rectangular light-through hole liquid crystal lens unit is relatively small, and the response time is short, so that the overall thickness of the spliced ​​liquid crystal lens is small and the response time is also short. In addition, the spliced ​​gap of the spliced ​​liquid crystal lens of the present invention is extremely small, and the aperture ratio is very high, and even if the number of spliced ​​rectangular light-through hole liquid crystal lens units increases, the aperture ratio will not decrease. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the embodiment of the present invention will be briefly introduced below. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work, and these are all within the protection scope of the present invention.

[0035] Figure 1 It is a schematic diagram of a rectangular through hole surrounded by four electrodes in a rectangular through hole liquid crystal lens unit of the present invention;

[0036] Figure 2 A longitudinal cross-sectional view of a liquid crystal lens unit with a rectangular light-through hole in a structure of the present invention;

[0037] Figure 3 A longitudinal cross-sectional view of a liquid crystal lens unit with a rectangular light-through hole of another structure in the present invention;

[0038] Figure 4 It is a schematic diagram of the overall structure of the spliced ​​liquid crystal lens of the present invention;

[0039] Figure 5 It is a schematic diagram of parallel light being refracted through each rectangular light-through hole liquid crystal lens unit in the present invention and then converged to the same optical axis position;

[0040] Figure 6 It is a schematic diagram of a spliced ​​liquid crystal lens obtained by splicing the rectangular light-through hole liquid crystal lens units of the present invention in a square array;

[0041] Figure 7 It is a schematic diagram of a spliced ​​liquid crystal lens obtained by splicing the rectangular light-through hole liquid crystal lens units of the present invention in a rectangular array;

[0042] Figure 8 It is a schematic diagram of another splicing form of the present invention;

[0043] Fig. 9 A flow chart of a method for driving a spliced ​​liquid crystal lens according to the present invention;

[0044] Fig.10 is the ideal interference pattern under the stitching lens;

[0045] Fig.11 Interference fringe pattern after the optical axis of a single rectangular aperture liquid crystal lens unit is moved;

[0046] Fig.12 The interference fringe pattern obtained by stitching;

[0047] Fig.13 It is a schematic diagram of the layout of the electrode lead-out circuit of the spliced ​​liquid crystal lens of the present invention;

[0048] Fig.14 It is a schematic structural diagram of a device for driving a spliced ​​liquid crystal lens according to the present invention. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described in conjunction with the drawings in the embodiment of the present invention. It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. In the absence of further restrictions, the elements defined by the phrase "comprising..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements. If there is no conflict, the various features in the embodiments and examples of the present invention can be combined with each other, all within the scope of protection of the present invention.

[0050] Embodiment 1:

[0051] See also Figure 1 and Figure 6 This embodiment discloses a spliced ​​liquid crystal lens, at least two rectangular light-through hole liquid crystal lens units and a driving circuit, each of the rectangular light-through hole liquid crystal lens units is arranged in an array and spliced ​​into a large-aperture liquid crystal lens, the electrodes of the rectangular light-through hole liquid crystal lens unit include a first electrode 21, a second electrode 22, a third electrode 81 and a fourth electrode 82 that form a rectangular light-through hole in the light-through direction, and the driving circuit is used to adjust the optical axes of each rectangular light-through hole liquid crystal lens unit to a position where they overlap with each other. The aforementioned large aperture refers to an aperture larger than the aperture of the light-through hole of a single rectangular light-through hole liquid crystal lens unit used for splicing.

[0052] like Figure 1 and Figure 4 As shown, in this embodiment, a plurality of rectangular light-through hole liquid crystal lens units with smaller apertures are spliced ​​together to form a liquid crystal lens with larger aperture. The driving circuit in this embodiment can control each rectangular light-through hole liquid crystal lens unit individually, so that each rectangular light-through hole liquid crystal lens unit can independently adjust the position of the optical axis and the focal length.

[0053] In this embodiment, on the one hand, since the rectangular light-through hole liquid crystal lens unit has the characteristic of adjustable optical axis position, the optical axes of all the rectangular light-through hole liquid crystal lens units used for splicing are adjusted to the same position by the driving circuit, so that the spliced ​​liquid crystal lens can become a large-aperture liquid crystal lens, achieving the same optical effect as a large-aperture liquid crystal lens. Figure 5 As shown in the figure, the light passing through the liquid crystal lens units with different rectangular light holes converges on the same optical axis. On the other hand, since the aperture of each rectangular light hole liquid crystal lens unit used for splicing is small, the thickness of each rectangular light hole liquid crystal lens unit is small and the response time is short, so that the overall thickness of the liquid crystal lens formed by splicing is small and the response time is also short. At the same time, since the light holes of the liquid crystal lens units used in this embodiment are rectangular, the gaps between adjacent rectangular light hole liquid crystal lens units are very small, so that the aperture ratio of the spliced ​​lens is very high, and even if the number of spliced ​​rectangular light hole liquid crystal lens units increases, the aperture ratio will not decrease.

[0054] See also Figure 2 In this embodiment, the rectangular light-through hole liquid crystal lens unit can adopt the following structural form, that is, a single rectangular light-through hole liquid crystal lens unit includes a first substrate 10, a first electrode layer 20, a first high-impedance mold layer 30, a first alignment layer 40, a liquid crystal layer 50, a second alignment layer 60, a second high-impedance film layer 70, a second electrode layer 80 and a second substrate 90 stacked in sequence, the first electrode 21 and the second electrode 22 are located in the first electrode layer 20, the first electrode 21 and the second electrode 22 are arranged opposite to each other, the third electrode 81 and the fourth electrode 82 are located in the second electrode layer 80, and the third electrode 81 layer and the fourth electrode 82 layer are arranged opposite to each other.

[0055] In the above structure, the rectangular through hole liquid crystal lens unit includes two substrates, namely a first substrate 10 and a second substrate 90, wherein the first substrate 10 and the second substrate 90 are arranged opposite to each other, wherein the first substrate 10 and the second substrate 90 can be glass substrates or transparent plastic substrates. A first electrode layer 20 and a first high impedance mold layer 30 are sequentially arranged on the surface of the first substrate 10 facing the second substrate 90, and a second electrode layer 80 and a second high impedance film layer 70 are sequentially arranged on the side of the second substrate 90 facing the first substrate 10. When the first electrode layer 20 and the second electrode layer 80 are energized, an electric field that drives the liquid crystal molecules to deflect is formed. The first high impedance mold layer 30 and the second high impedance film layer 70 can make the voltage in the through hole area linearly distributed. The aforementioned first alignment layer 40 and the second alignment layer 60 are used to align the liquid crystal layer 50. The liquid crystal molecules of the liquid crystal layer 50 are arranged at a certain pre-tilt angle under the action of the first alignment layer 40 and the second alignment layer 60.

[0056] In addition, if Figure 3 As shown, the present embodiment also provides another structure to realize a rectangular light-through hole liquid crystal lens unit. The rectangular light-through hole liquid crystal lens unit of the structure includes a first substrate 10, a first electrode layer 20, a first alignment layer 40, a liquid crystal layer 50, a second alignment layer 60, a second electrode layer 80 and a second substrate 90 which are stacked in sequence. The first electrode 21 and the second electrode 22 are located in the first electrode layer 20. The first electrode layer 20 also includes a first high-impedance film 23. The first electrode 21 and the second electrode 22 are arranged at opposite ends of the first high-impedance film 23. The third electrode 81 and the fourth electrode 82 are located in the second electrode layer 80. The second electrode layer 80 also includes a second high-impedance film. The third electrode 81 and the fourth electrode 82 are arranged at opposite ends of the second high-impedance film.

[0057] In this structure, the first high impedance film 23 is arranged on the same layer as the first electrode 21 and the second electrode 22, and the second high impedance film is arranged on the same layer as the third electrode 81 and the fourth electrode 82. The aforementioned structure can make the spatial distribution of the electric field in the liquid crystal layer 50 independent of the resistance value of the impedance film and only related to the uniformity of the resistance value of the impedance film, so that the stability of the spliced ​​liquid crystal lens can be further improved.

[0058] The aforementioned structures all use the first electrode 21, the second electrode 22, the third electrode 81 and the fourth electrode 82 to drive the liquid crystal lens unit. The four electrodes form a rectangular light-through hole, which is the rectangular light-through hole of the liquid crystal lens unit. The optical axis position of the rectangular light-through hole liquid crystal lens unit can be adjusted by adjusting the voltage parameters applied to the aforementioned four electrodes.

[0059] The high impedance film may be a transparent high impedance film. In addition, in order to improve the imaging effect of the large-aperture liquid crystal lens after splicing, the first electrode 21, the second electrode 22, the third electrode 81 and the fourth electrode 82 may be transparent electrodes, such as ITO electrodes.

[0060] Example 2

[0061] This embodiment provides a variety of splicing methods for splicing liquid crystal lenses.

[0062] The splicing method of splicing liquid crystal lenses can be: the plurality of rectangular light-through hole liquid crystal lens units are arranged in an n×n array (such as Figure 6), where n is a positive integer greater than or equal to 2. The aforementioned splicing method is used, and the number of rows and columns of the rectangular light-through hole liquid crystal lens unit are equal, for example, a 2×2 array arrangement, a 3×3 array arrangement, a 4×4 array arrangement, etc. The light-through hole of the light-through hole liquid crystal lens unit used for splicing can be a square or a rectangle with unequal length and width. When square light-through hole liquid crystal lens units are spliced, a liquid crystal lens with a large-diameter square light-through hole can be spliced.

[0063] The splicing method of splicing liquid crystal lenses can also be: the plurality of rectangular light-through hole liquid crystal lens units are arranged in an m×k array, m≠k (such as Figure 7 ), wherein one of m and k is a positive integer greater than or equal to 1, and the other is a positive integer greater than or equal to 2. In the aforementioned splicing method, the number of rows and columns of the rectangular light-through hole liquid crystal lens unit may be unequal, for example, a 4×3 array arrangement, a 3×4 array arrangement, a 4×5 array arrangement, a 5×4 array arrangement, etc. The light-through hole of the rectangular light-through hole liquid crystal lens unit for splicing may be a square or a rectangle with unequal length and width.

[0064] The splicing method of splicing liquid crystal lenses can also be as follows Figure 8 As shown: the sizes of the light-through holes of the rectangular light-through hole liquid crystal lens units used for splicing can be partially different or completely different.

[0065] In addition to the aforementioned splicing methods, this embodiment can also utilize different sizes and any number of rectangular light-through hole liquid crystal lens units to splice various shapes of spliced ​​liquid crystal lenses in any arrangement as needed, and there is no limitation here.

[0066] Example 3

[0067] In this embodiment, the driving circuit includes a sub-driving circuit corresponding to each rectangular light-through hole liquid crystal unit, and each sub-driving circuit can independently drive the corresponding rectangular light-through hole liquid crystal lens unit. In order to facilitate the individual control of each rectangular light-through hole liquid crystal lens unit for splicing, in this embodiment, the same number of sub-driving circuits as the rectangular light-through hole liquid crystal lens units are set in the driving circuit, and one sub-driving circuit controls one rectangular light-through hole liquid crystal lens unit separately, so that the optical axis position of each rectangular light-through hole liquid crystal lens unit can be adjusted independently without affecting each other, which is convenient for adjusting the optical axis of the rectangular light-through hole liquid crystal lens unit at different positions to the same position. In addition, the driving circuit can also be provided with a main controller, which can calculate the voltage parameters for driving each rectangular light-through hole liquid crystal lens unit according to the final adjusted position of the optical axis of each rectangular light-through hole liquid crystal lens unit, and then distribute the voltage parameters to the sub-driving circuits corresponding to each rectangular light-through hole liquid crystal lens unit, and the sub-driving circuit controls the corresponding rectangular light-through hole liquid crystal lens unit to adjust the optical axis to the target position.

[0068] Each sub-driving circuit may include a first driving voltage unit for applying a driving voltage to the first electrode 21, a second driving voltage unit for applying a driving voltage to the second electrode 22, a third driving voltage unit for applying a driving voltage to the third electrode 81, and a fourth driving voltage unit for applying a driving voltage to the fourth electrode 82. Under the control of the driving circuit, each driving voltage unit provides a corresponding driving voltage to its corresponding electrode. Each electrode may be led out to a position connected to the driving circuit through wiring or printed circuits. Fig.13 As shown, the lead-out method may be that a part of the wiring or printed circuit is led out along a first direction, and another part of the printed circuit is led out along a second direction different from the first direction. The first direction and the second direction are preferably two mutually perpendicular directions. By adopting the above-mentioned lead-out method, when the number of rectangular light-through hole liquid crystal lens units is large, the lead-out lines can be made more regular and do not affect each other.

[0069] Example 4

[0070] This embodiment provides an electronic device, which includes the spliced ​​liquid crystal lens in any of the above embodiments. The electronic device in this embodiment uses the spliced ​​liquid crystal lens in the above embodiments as a large-aperture adjustable lens, which has the advantages of thin thickness, fast response, convenient focusing, and good imaging effect. The electronic device in this embodiment can be a VR device, an imaging device, adaptive glasses, etc.

[0071] Example 5

[0072] like Fig. 9 As shown, this embodiment provides a method for splicing liquid crystal lenses in the above-mentioned embodiment, and the method includes the following steps:

[0073] S1: Obtain the target optical axis position of the spliced ​​liquid crystal lens;

[0074] The target optical axis position is the position where the optical axes of the rectangular light-through hole liquid crystal lens units coincide with each other. The target optical axis position of the spliced ​​liquid crystal lens is determined before driving the spliced ​​liquid crystal lens. In order to prevent the driving voltage of the rectangular light-through hole liquid crystal lens unit at the edge of the spliced ​​liquid crystal lens from being too high, the position at the geometric center of the spliced ​​liquid crystal lens or the position near the geometric center of the spliced ​​liquid crystal lens can be selected as the target optical axis position. For example, the rectangular light-through hole liquid crystal lens unit located in the middle of the plurality of rectangular light-through hole liquid crystal lens units is selected as the central liquid crystal lens unit, and then the optical axes of the remaining rectangular light-through hole liquid crystal lens units are adjusted to coincide with the optical axis position of the central liquid crystal lens unit.

[0075] S2: Obtaining the initial optical axis position and initial voltage parameters of each rectangular light-through hole liquid crystal lens unit;

[0076] The initial voltage can be an AC voltage with a fixed frequency. The aforementioned initial voltage parameters include the initial voltage parameters of the four electrodes of the rectangular aperture liquid crystal lens unit, which are the initial voltage amplitude v1 applied to the first electrode 21, the initial phase The initial voltage amplitude v2 and initial phase v2 applied to the second electrode 22 The initial voltage amplitude v3 and initial phase v4 applied to the third electrode 81 are: The initial voltage amplitude v4 and initial phase v4 applied to the fourth electrode 82 are: in,

[0077] S3: determining the target voltage parameter of each rectangular light-through hole liquid crystal lens unit according to the initial optical axis position, initial voltage parameter and the target optical axis position of each rectangular light-through hole liquid crystal lens unit;

[0078] The target voltage may be an AC voltage with a fixed frequency. The target voltage parameters include the target voltage parameters of the four electrodes of the rectangular aperture liquid crystal lens unit, which are the target voltage amplitude v applied to the first electrode 21 and the target voltage amplitude v applied to the first electrode 21. 1a , target phase The target voltage amplitude v applied to the second electrode 22 2a , target phase The target voltage amplitude v applied to the third electrode 81 is 3a , target phase The target voltage amplitude v applied to the fourth electrode 82 4a , target phase in

[0079] The specific method for calculating the target voltage parameter may include the following steps:

[0080] S31: establishing a rectangular coordinate system with the initial optical axis position of the rectangular light-through hole liquid crystal lens unit as the coordinate origin;

[0081] S32: Acquire the coordinates (ox, oy) of the target optical axis position in the coordinate system;

[0082] The effective voltage value of each point in the effective area of ​​the liquid crystal lens unit is:

[0083]

[0084] The voltage value at the optical axis of the lens should remain unchanged before and after movement.

[0085] S33: Calculate the target voltage parameter according to the following formula:

[0086]

[0087]

[0088]

[0089]

[0090]

[0091] v 2a =v 1a t 21a

[0092]

[0093] v 4a =v 3a t 43a

[0094] From the above method of calculating the target voltage parameters, it can be seen that the optical axis position of the rectangular light-through hole liquid crystal lens unit is affected by the amplitude and phase of the voltage applied to the four electrodes. Therefore, the spliced ​​liquid crystal lens of the present invention is used to adjust the amplitude and phase of the voltage applied to the four electrodes of the rectangular light-through hole liquid crystal lens unit to adjust the optical axis of the rectangular light-through hole liquid crystal lens unit to the target optical axis position. When calculating, the initial voltage parameters can be set to satisfy f1=f2≠f3=f4, (f1, f2, f3, f4 are the frequencies of the voltages applied to the first electrode 21, the second electrode 22, the third electrode 81 and the fourth electrode 82 respectively) v1=v2=v3=v4,

[0095] S4: driving the corresponding rectangular light-through-hole liquid crystal lens units respectively according to the target voltage parameters of the rectangular light-through-hole liquid crystal lens units.

[0096] As an example, in this embodiment, a single rectangular aperture liquid crystal lens unit is placed in one arm of the Michelson interference optical path, and a polarizer with the same polarization direction as the liquid crystal orientation direction is placed in front of the interference optical path for polarization. The light is expanded by a beam expander, then enters a polarizer, and then enters the interference optical path to form interference fringes, and finally forms an image in the CCD. When a voltage is applied to the rectangular aperture liquid crystal lens unit, the equipotential lines of the electric field in the effective area are concentric circles, which can deflect the liquid crystal molecules, change the refractive index, and form a phase distribution similar to that of a glass lens.

[0097] In order to observe the working condition of the rectangular aperture liquid crystal lens unit, a 457nm laser was used to test it. When we add the effective value of the voltage amplitude v1 = v2 = v3 = v4 = 1.628V, the phase When the voltage frequency is f1=f2=500Hz, f3=f4=1kHz, interference fringes can be observed in the CCD, such as Fig.11 The interference fringes of the rectangular aperture liquid crystal lens are shown in Figure 5. At this time, the interference fringes of the rectangular aperture liquid crystal lens are similar to those of the glass lens and the optical axis is at the geometric center of the rectangular aperture.

[0098] Then a single rectangular aperture liquid crystal lens unit is placed in one of the arms of the Michelson interference optical path, and a polarizer with the same polarization direction as the liquid crystal orientation direction is placed in front of the interference optical path for polarization. The light first passes through the beam expander to become parallel light, then enters the polarizer, and then enters the interference optical path to form interference fringes, and finally forms an image in the CCD. When the voltage of the rectangular aperture liquid crystal lens unit is changed, the center of the concentric circular potential lines formed in the effective area moves, the liquid crystal molecules are deflected, and the refractive index changes, so that the optical axis of the formed rectangular aperture liquid crystal lens can be moved.

[0099] In order to observe the working condition of the rectangular hole liquid crystal lens in Example 2, a 457nm laser was used to test it. When we add the frequency f1=f2=500Hz, f3=f4=1kHz, the effective value and phase of the voltage amplitude are shown in Table 1 below:

[0100] Table 1

[0101]

[0102] We can observe interference fringes in CCD, corresponding to Fig.11 The interference fringe patterns corresponding to the numbers 1, 2, 3, 4, 6, 7, 8, and 9. Then we will Fig.11 The stripes in the splicing are as follows: Fig.12 As shown. It can be seen that the optical axis of the rectangular aperture liquid crystal lens has moved, and the optical axes of the surrounding rectangular aperture liquid crystal lenses have all moved to coincide with the optical axis of the middle rectangular aperture liquid crystal lens. At this time, the lens splicing is completed, and nine small-aperture rectangular aperture liquid crystal lenses can be seamlessly spliced ​​into a large-aperture liquid crystal lens with an aperture three times larger.

[0103] The plurality of rectangular light-through hole liquid crystal lens units are arranged in a c×e array, one of c and e is an odd number greater than or equal to 1, and the other is an odd number greater than or equal to 2. In S1, the target optical axis position is the position of the optical axis of the rectangular light-through hole liquid crystal lens unit at the center of the array. The aforementioned array arrangement can directly use the optical axis of the rectangular light-through hole liquid crystal lens unit at the center of the array as the target optical axis.

[0104] Example 6

[0105] In addition, combined Fig.14The method for driving the spliced ​​liquid crystal lens according to the embodiment of the present invention described above can be implemented by a device for driving the spliced ​​liquid crystal lens. Fig.14 A schematic diagram of the hardware structure of a device for driving a spliced ​​liquid crystal lens provided by an embodiment of the present invention is shown.

[0106] The device for driving the spliced ​​liquid crystal lens may include a processor 401 and a memory 402 storing computer program instructions.

[0107] Specifically, the processor 401 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiment of the present invention.

[0108] Memory 402 may include a large capacity memory for data or instructions. For example, but not limitation, memory 402 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. In appropriate cases, memory 402 may include a removable or non-removable (or fixed) medium. In appropriate cases, memory 402 may be inside or outside a data processing device. In a specific embodiment, memory 402 is a non-volatile solid-state memory. In a specific embodiment, memory 402 includes a read-only memory (ROM). In appropriate cases, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM) or a flash memory or a combination of two or more of these.

[0109] The processor 401 reads and executes the computer program instructions stored in the memory 402 to implement any one of the methods for driving the spliced ​​liquid crystal lens in the above embodiments.

[0110] In one example, the device for driving the spliced ​​liquid crystal lens may further include a communication interface 403 and a bus 410. Fig.14 As shown, the processor 401, the memory 402, and the communication interface 403 are connected via a bus 410 and communicate with each other.

[0111] The communication interface 403 is mainly used to implement the communication between the modules, devices, units and / or equipment in the embodiment of the present invention.

[0112] Bus 410 includes hardware, software or both, and each component is coupled to each other. For example, but not limitation, bus may include accelerated graphics port (AGP) or other graphics bus, enhanced industrial standard architecture (EISA) bus, front side bus (FSB), hypertransport (HT) interconnection, industrial standard architecture (ISA) bus, infinite bandwidth interconnection, low pin count (LPC) bus, memory bus, micro channel architecture (MCA) bus, peripheral component interconnection (PCI) bus, PCI-Express (PCI-X) bus, serial advanced technology attachment (SATA) bus, video electronics standard association local (VLB) bus or other suitable bus or two or more of these combinations. In appropriate cases, bus 410 may include one or more buses. Although the embodiment of the present invention describes and shows a specific bus, the present invention considers any suitable bus or interconnection.

[0113] Example 7

[0114] In addition, in combination with the method of driving the spliced ​​liquid crystal lens in the above embodiment, the embodiment of the present invention can provide a computer-readable storage medium for implementation. The computer-readable storage medium stores computer program instructions; when the computer program instructions are executed by a processor, any one of the color printing methods in the above embodiment is implemented.

[0115] The above is a detailed introduction to the spliced ​​liquid crystal lens, the electronic device, and the method for driving the spliced ​​liquid crystal lens provided by the embodiments of the present invention.

[0116] It should be clear that the present invention is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is 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, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present invention.

[0117] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present invention are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by 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, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0118] It should also be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or in a different order from the embodiments, or several steps can be performed simultaneously.

[0119] The above is only a specific implementation of the present invention. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working 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 technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be covered within the protection scope of the present invention.

Claims

1. A method for driving a spliced ​​liquid crystal lens, the spliced ​​liquid crystal lens comprising: At least two rectangular light-through hole liquid crystal lens units and a driving circuit, each of the rectangular light-through hole liquid crystal lens units is arranged in an array and spliced ​​into a large-caliber liquid crystal lens, the rectangular light-through hole liquid crystal lens unit comprises: a first electrode, a second electrode, a third electrode and a fourth electrode, and a rectangular light-through hole in the light-through direction surrounded by the first electrode, the second electrode, the third electrode and the fourth electrode, the driving circuit outputs a driving voltage to the first electrode, the second electrode, the third electrode and the fourth electrode of each rectangular light-through hole liquid crystal lens unit to adjust the optical axes of each rectangular light-through hole liquid crystal lens unit to a position where they overlap with each other, characterized in that it comprises the following steps: S1: Obtain the target optical axis position of the spliced ​​liquid crystal lens; S2: Obtaining the initial optical axis position and initial voltage parameters of each rectangular light-through hole liquid crystal lens unit; S3: determining the target voltage parameter of each rectangular light-through hole liquid crystal lens unit according to the initial optical axis position, initial voltage parameter and the target optical axis position of each rectangular light-through hole liquid crystal lens unit; S4: driving the corresponding rectangular light-through-hole liquid crystal lens units respectively according to the target voltage parameters of the rectangular light-through-hole liquid crystal lens units; The initial voltage parameters of the rectangular light-through hole liquid crystal lens unit include an initial voltage amplitude v1 and an initial phase φ1 applied to the first electrode, an initial voltage amplitude v2 and an initial phase φ2 applied to the second electrode, an initial voltage amplitude v3 and an initial phase φ3 applied to the third electrode, and an initial voltage amplitude v4 and an initial phase φ4 applied to the fourth electrode; the target voltage parameters include a target voltage amplitude v applied to the first electrode. 1a 、Target phase φ 1a , the target voltage amplitude v applied to the second electrode 2a 、Target phase φ 2a , the target voltage amplitude v applied to the third electrode 3a 、Target phase φ 3a , the target voltage amplitude v applied to the fourth electrode 4a 、Target phase φ 4a , where, φ1=φ3=0, φ2=φ4=φ, φ 1a =φ 3a =0,φ 2a =φ 4a =φ a , said S3 comprises: S31: establishing a rectangular coordinate system with the initial optical axis position of the rectangular light-through hole liquid crystal lens unit as the coordinate origin; S32: Obtain the coordinates of the target optical axis position in the coordinate system ( ox , oy ); S33: Calculate the target voltage parameter according to the following formula: ， ， ， ， ， ， ， 。 2. The method for driving a spliced ​​liquid crystal lens according to claim 1, characterized in that: The plurality of rectangular light-through hole liquid crystal lens units are arranged in a c×e array, one of c and e is an odd number greater than or equal to 1, and the other is an odd number greater than or equal to 2. In S1, the target optical axis position is the position of the optical axis of the rectangular light-through hole liquid crystal lens unit at the center of the array.

3. The method for driving a spliced ​​liquid crystal lens according to claim 1, characterized in that: The rectangular light-through hole liquid crystal lens unit includes a first substrate, a first electrode layer, a first high-impedance film layer, a first alignment layer, a liquid crystal layer, a second alignment layer, a second high-impedance film layer, a second electrode layer and a second substrate which are stacked in sequence, the first electrode and the second electrode are located in the first electrode layer, the first electrode and the second electrode are arranged opposite to each other, the third electrode and the fourth electrode are located in the second electrode layer, and the third electrode layer and the fourth electrode layer are arranged opposite to each other.

4. The method for driving a spliced ​​liquid crystal lens according to claim 1, characterized in that: The rectangular light-through hole liquid crystal lens unit includes a first substrate, a first electrode layer, a first alignment layer, a liquid crystal layer, a second alignment layer, a second electrode layer and a second substrate which are stacked in sequence, the first electrode and the second electrode are located in the first electrode layer, the first electrode layer also includes a first high-impedance film, the first electrode and the second electrode are arranged at opposite ends of the first high-impedance film, the third electrode and the fourth electrode are located in the second electrode layer, the second electrode layer also includes a second high-impedance film, the third electrode and the fourth electrode are arranged at opposite ends of the second high-impedance film.

5. The method for driving a spliced ​​liquid crystal lens according to claim 4, characterized in that: The driving circuit includes sub-driving circuits corresponding to each rectangular light-through hole liquid crystal unit one by one, and each sub-driving circuit can independently drive the corresponding rectangular light-through hole liquid crystal lens unit.

6. The method for driving a spliced ​​liquid crystal lens according to claim 5, characterized in that: The sub-driving circuit includes a first driving voltage unit for applying a driving voltage to the first electrode, a second driving voltage unit for applying a driving voltage to the second electrode, a third driving voltage unit for applying a driving voltage to the third electrode, and a fourth driving voltage unit for applying a driving voltage to the fourth electrode.

7. The method for driving a spliced ​​liquid crystal lens according to claim 1, characterized in that: The plurality of rectangular light-through-hole liquid crystal lens units are arranged in an m×k array, m≠k, wherein one of m and k is a positive integer greater than or equal to 1, and the other is a positive integer greater than or equal to 2.

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