Large-viewing-angle liquid lens structure and optical system

Abstract

The invention provides a large-viewing-angle liquid lens structure and an optical system, and relates to the technical field of optical devices. The large-viewing-angle liquid lens structure comprises first liquid, second liquid and third liquid which are sequentially arranged along the axis, and the second liquid is not fused with the first liquid and the third liquid; the first liquid and the third liquid are insulating liquid, and the second liquid comprises ionic liquid; the at least two first electrodes are positioned on the periphery of the first liquid around the axis; the at least one second electrode is electrically connected with the ionic liquid and is configured to enable the ionic liquid to be electrified; and the at least two third electrodes are positioned on the periphery of the third liquid around the axis. The focal length and / or the optical axis of the large-view-angle liquid lens structure are / is adjusted, the deflection angle of the optical axis is increased, and the response speed of the large-view-angle liquid lens structure is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of optical devices, and in particular to a large-viewing-angle liquid lens structure and an optical system. Background Art

[0002] Liquid lens is an optical element made of liquid without mechanical connection. The internal parameters of the optical element can be changed by external control to achieve zoom. The application fields of liquid lens include photography, optical measurement, etc. Compared with traditional lenses, liquid lenses have the advantages of small size, fast response, low cost and high integration.

[0003] Most existing liquid lenses are designed with variable focal lengths, and the use of a multi-electrode design can cause the lens optical axis to change. However, the common structural design currently has a limited range of lens rotation. At the same time, due to structural limitations, the shape of the lens after the optical axis is rotated varies more than when the optical axis is not rotated. Summary of the invention

[0004] The embodiments of the present invention provide a wide-viewing angle liquid lens structure and an optical system, which realize the adjustment of the focal length and / or optical axis of the wide-viewing angle liquid lens structure, increase the deflection angle of the optical axis, and increase the response speed of the wide-viewing angle liquid lens structure.

[0005] The first aspect of the present invention provides a wide-viewing angle liquid lens structure, comprising: a first liquid, a second liquid and a third liquid arranged in sequence along an axis, the second liquid being immiscible with the first liquid and the third liquid; the first liquid and the third liquid being insulating liquids, the second liquid comprising an ionic liquid; at least two first electrodes, located on the periphery of the first liquid around the axis; at least one second electrode, electrically connected to the ionic liquid and configured to charge the ionic liquid; and at least two third electrodes, located on the periphery of the third liquid around the axis.

[0006] In some embodiments of the first aspect of the present invention, along the extension direction of the axis, the second electrode is located between the first electrode and the third electrode.

[0007] In some embodiments of the first aspect of the present invention, the end of the first electrode away from the second liquid forms a first light opening; the second electrode surrounds the second liquid to form a second light opening; the end of the third electrode away from the second liquid forms a third light opening; the diameter of the first light opening is larger than the diameter of the second light opening, and / or the diameter of the third light opening is larger than the diameter of the second light opening.

[0008] In some embodiments of the first aspect of the present invention, a diameter of the first light-transmitting opening is greater than or equal to a diameter of the third light-transmitting opening.

[0009] In some embodiments of the first aspect of the present invention, the cross-sectional shape of the first electrode along the plane where the axis is located includes a first electrode first portion and a first electrode second portion, and the first electrode first portion and the first electrode second portion are both straight line segments; and / or, the cross-sectional shape of the third electrode along the plane where the axis is located includes a third electrode first portion and a third electrode second portion, and the third electrode first portion and the third electrode second portion are both straight line segments.

[0010] In some embodiments of the first aspect of the present invention, the first electrode and the third electrode are symmetrically arranged with respect to a horizontal reference plane; the horizontal reference plane is perpendicular to the axis.

[0011] In some embodiments of the first aspect of the present invention, the second electrode includes a first sub-second electrode and a second sub-second electrode that are oppositely disposed.

[0012] In some embodiments of the first aspect of the present invention, at least two of the first electrodes include a first sub-first electrode and a second sub-first electrode disposed oppositely; and at least two of the third electrodes include a first sub-third electrode and a second sub-third electrode disposed oppositely.

[0013] In some embodiments of the first aspect of the present invention, at least two of the first electrodes further include a third sub-first electrode and a fourth sub-first electrode that are arranged opposite to each other; along the axial direction around the axis, the third sub-first electrode is located between the first sub-first electrode and the second sub-first electrode, and the fourth sub-first electrode is located between the first sub-first electrode and the second sub-first electrode; at least two of the third electrodes further include a third sub-third electrode and a fourth sub-third electrode that are arranged opposite to each other; along the circumferential direction around the axis, the third sub-third electrode is located between the first sub-third electrode and the second sub-third electrode, and the fourth sub-third electrode is located between the first sub-third electrode and the second sub-third electrode.

[0014] In some embodiments of the first aspect of the present invention, the first liquid and the third liquid both include oily liquids; and the first liquid and the third liquid are made of the same or different materials.

[0015] In some embodiments of the first aspect of the present invention, the wide-viewing angle liquid lens structure also includes a dielectric layer, which surrounds the first liquid, the second liquid and the third liquid, and is located between the first electrode and the first liquid, and between the third electrode and the third liquid.

[0016] A second aspect of the present invention provides an optical system, comprising the large viewing angle liquid lens structure as described above.

[0017] The wide-angle liquid lens structure provided by the embodiment of the present invention comprises a first liquid, a second liquid and a third liquid, and at least two first electrodes, at least one second electrode and at least two third electrodes adapted to the first liquid, the second liquid and the third liquid. By adjusting the voltage applied to the first electrode, the second electrode and the third electrode, the focal length and / or optical axis of the wide-angle liquid lens structure are adjusted. Furthermore, compared with the liquid lens in which two liquids are set, the second liquid in the embodiment of the present invention can be subjected to forces in both the upper and lower directions at the same time, thereby increasing the deformation degree of the second liquid and the speed at which the second liquid reaches a preset deformation position. Thereby, the focal length and / or optical axis of the wide-angle liquid lens structure are adjusted, the deflection angle of the optical axis is increased, and the reaction speed of the wide-angle liquid lens structure is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of a large viewing angle liquid lens structure in an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the optical axis deflection of a large viewing angle liquid lens structure in an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of another large viewing angle liquid lens structure in an embodiment of the present invention;

[0021] Figure 4 A schematic diagram of another large viewing angle liquid lens structure in an embodiment of the present invention;

[0022] Figure 5 is a schematic top view of a first electrode in an embodiment of the present invention;

[0023] Figure 6 is a schematic top view of a third electrode in an embodiment of the present invention;

[0024] Figure 7 This is an initial schematic diagram of the optical axis of the large viewing angle liquid lens structure in an embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram of a large viewing angle liquid lens structure after optical axis adjustment in an embodiment of the present invention;

[0026] Fig. 9 is a schematic top view of another first electrode in an embodiment of the present invention;

[0027] Fig.10 FIG. 4 is a schematic top view of another third electrode in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0029] Figure 1 FIG. 1 is a schematic diagram of a large viewing angle liquid lens structure according to an embodiment of the present invention. Figure 1 As shown, the wide-angle liquid lens structure includes a first liquid 1, a second liquid 2 and a third liquid 3 arranged in sequence along an axis 8. The second liquid 2 is immiscible with the first liquid 1 and the third liquid 3. The second liquid 2 is immiscible with the first liquid 1, and the second liquid 2 is immiscible with the third liquid 3. The first liquid 1 and the third liquid 3 are insulating liquids, and the second liquid 2 includes an ionic liquid. The wide-angle liquid lens structure also includes at least two first electrodes 4, at least one second electrode 5 and at least two third electrodes 6. The first electrode 4 is located on the periphery of the first liquid 1 around the axis 8. The second electrode 5 is electrically connected to the ionic liquid, and the second electrode 5 is configured to charge the ionic liquid. The second electrode 5 can apply a positive voltage to make the ionic liquid positively charged; or, the second electrode 5 can apply a negative voltage to make the ionic liquid negatively charged. The third electrode 6 is located on the periphery of the third liquid 3 around the axis 8. Among them, the axis 8 is the center line of the cavity of the wide-angle liquid lens structure.

[0030] Exemplarily, the insulating liquid can be specifically understood as a non-conductive liquid. Optionally, the insulating liquid can be transformer oil, silicone oil, fluoride liquid, mineral oil or polymer insulating liquid. The ionic liquid can be specifically understood as a liquid composed of cations and anions, which can produce a conductivity effect under the action of an electric field. Optionally, the ionic liquid can be a liquid containing ions such as ammonium chloride or ammonium bromide, which is not limited in the embodiment of the present invention.

[0031] For example, reference Figure 1 In the embodiment of the present invention, at least two first electrodes 4 are provided, and the first electrodes 4 are located on the periphery of the first liquid 1 and distributed around the axis 8. At least one second electrode 5 is electrically connected to the ionic liquid, and is intended to apply an electric field to the ionic liquid to charge it. At least two third electrodes 6 are also configured in the wide-angle liquid lens structure, and the third electrodes 6 are located on the periphery of the third liquid 3 and distributed around the axis 8. The first electrode 4, the second electrode 5 and the third electrode 6 form a cavity, and the first liquid 1, the second liquid 2 and the third liquid 3 are arranged in the cavity.

[0032] The wide-angle liquid lens structure provided by the embodiment of the present invention comprises a first liquid 1, a second liquid 2 and a third liquid 3, and at least two first electrodes 4, at least one second electrode 5 and at least two third electrodes 6 adapted to the first liquid 1, the second liquid 2 and the third liquid 3. By adjusting the voltage applied to the first electrode 4, the second electrode 5 and the third electrode 6, the focal length and / or optical axis of the wide-angle liquid lens structure are adjusted. Furthermore, compared with the liquid lens in which two liquids are set, the second liquid 2 in the embodiment of the present invention can be subjected to forces in both the upper and lower directions at the same time, which increases the deformation degree of the second liquid 2 and the speed at which the second liquid 2 reaches the preset deformation position. The focal length and / or optical axis of the wide-angle liquid lens structure are adjusted, the deflection angle of the optical axis is increased, and the reaction speed of the wide-angle liquid lens structure is increased.

[0033] Exemplarily, the contact angle between the second liquid 2 and the wall is controlled by the combination of working voltages applied to the first electrode 4, the second electrode 5 and the third electrode 6, respectively, to change the surface shape of the interface between the first liquid 1 and the second liquid 2, and / or to change the surface shape of the interface between the second liquid 2 and the third liquid 3, so as to achieve the purpose of controlling the curvature of the interface. When a certain voltage is applied to the first electrode 4, the second electrode 5 and the third electrode 6, the interface between the first liquid 1 and the second liquid 2, and the interface between the second liquid 2 and the third liquid 3 remain spherical, and the central symmetry axis (i.e., the optical axis) of the interface coincides with the axis 8 of the cavity, realizing the zoom function of the large viewing angle liquid lens structure. Among them, the wall surface can be the inner wall surface of the cavity formed by the first electrode 4 or the third electrode 6. A dielectric layer 7 can also be provided between the first electrode 4 and the first liquid 1, and a dielectric layer 7 can also be provided between the third electrode 6 and the third liquid 3, and the wall surface can be the surface of the dielectric layer 7.

[0034] Exemplarily, the dielectric layer 7 is provided with a dielectric layer opening, and the second electrode 5 passes through the dielectric layer opening and is electrically connected to the second liquid 2 .

[0035] Optional, reference Figure 1, along the extension direction of the axis 8, the second electrode 5 is located between the first electrode 4 and the third electrode 6. Along the extension direction of the axis 8, the first electrode 4, the second electrode 5 and the third electrode 6 are arranged in sequence. The second electrode 5 is located at the periphery of the second liquid 2. Thereby, the second liquid 2 can be directly electrically connected to the second electrode 5 at its periphery, and the distance between the second liquid 2 and the second electrode 5 is short, which is convenient for wiring. On the other hand, light can be incident through the third liquid 3, pass through the second liquid 2, and finally exit through the first liquid 1. The second electrode 5 is arranged at the periphery of the second liquid 2, which reduces or even avoids the second electrode 5 occupying the light propagation channel. In other embodiments, at least a portion of the second electrode 5 can also be located in the first liquid 1 or the third liquid 3, that is, the second electrode 5 passes through the first liquid 1 or the third liquid 3 and is electrically connected to the second liquid 2.

[0036] When the optical axis of the liquid lens rotates, the shell does not move, resulting in a smaller numerical aperture than the vertical state, less light passing through, and the light rotation angle is about half of the vertical axis rotation angle of the liquid lens surface. The light rotation range determines the optical angle range of the liquid lens, and its rotation range in application is limited.

[0037] Figure 2 Schematic diagram of the optical axis deflection of a large viewing angle liquid lens structure in an embodiment of the present invention. Figure 2 The contact angles between the second liquid 2 and the wall are controlled by the working voltage combinations applied to the first electrode 4, the second electrode 5 and the third electrode 6. According to the electrowetting principle, the contact angle will decrease as the voltage increases. Therefore, on the side where high voltage is applied, the contact angle between the wall and the second liquid 2 is smaller, while the contact angle between the wall and the second liquid 2 is larger when low voltage is applied. The central symmetry axis of the interface (i.e., the optical axis 10) deviates from the axis 8 of the cavity, thereby achieving the purpose of changing the optical axis of the large-viewing-angle liquid lens structure.

[0038] refer to Figure 1 and Figure 2 , the first electrode 4 is surrounded by the end away from the second liquid 2 to form a first light opening. The caliber of the first light opening is D1. The second electrode 5 is surrounded by the second liquid 2 to form a second light opening, and the caliber of the second light opening is D2. The third electrode 6 is surrounded by the end away from the second liquid 2 to form a third light opening, and the caliber of the third light opening is D3. D1 is greater than D2, and / or D3 is greater than D2. In the implementation of the present invention, the size of the upper and lower openings of the wide-angle liquid lens structure is greater than the size of the middle part, the size of the upper and lower openings is increased, and the upper and lower openings form an angle with the middle part of the wide-angle liquid lens structure to increase the light emission angle after the optical axis 10 deviates from the axis 8. The stability of the light passing area is improved. On the other hand, during the rotation of the optical axis of the wide-angle liquid lens structure, the inaccurate focal length or graphic distortion caused by the inaccurate surface shape caused by the extrusion of the first liquid 1, the second liquid 2 and / or the third liquid 3 with the side wall is reduced.

[0039] For example, reference Figure 2 , the light L1 has a large inclination angle, and in the known conventional liquid lens, it will be blocked by the side wall and cannot be emitted. However, in the large-angle liquid lens structure provided by the embodiment of the present invention, since the size of the upper and lower openings is increased, the light L1 will not be blocked by the side wall and can pass through the large-angle liquid lens structure normally.

[0040] For example, reference Figure 1 , the aperture of the first light opening is equal to the aperture of the third light opening. D1 is equal to D3. The first light opening and the third light opening have the same size and have the same degree of restriction (ie, the inclination angle) on the light.

[0041] Figure 3 FIG. 1 is a schematic diagram of another large viewing angle liquid lens structure according to an embodiment of the present invention. Figure 3 , the aperture of the first light opening is larger than the aperture of the third light opening. D1 is larger than D2, D3 is larger than D2, and D1 is larger than D3. In this embodiment, the aperture of the light exit port (i.e., the first light opening) can be set larger, so that even if the light deviates from the center by too large an angle, the light can still be emitted through the first light opening, and the deformation of the lens surface caused by the side wall extrusion is reduced.

[0042] Optional, reference Figure 1 or Figure 3 , the cross-sectional shape of the first electrode 4 along the plane where the axis 8 is located includes the first electrode first part 401 and the first electrode second part 402. The first electrode first part 401 and the first electrode second part 402 are both straight line segments. The first electrode first part 401 is the part of the first electrode 4 far away from the second liquid 2, and the first electrode second part 402 is the part of the first electrode 4 adjacent to the second liquid 2. The first electrode first part 401 extends in a direction away from the axis 8 and the first electrode second part 402. And / or, the cross-sectional shape of the third electrode 6 along the plane where the axis 8 is located includes the third electrode first part 601 and the third electrode second part 602, and the third electrode first part 601 and the third electrode second part 602 are both straight line segments. The third electrode first part 601 is the part of the third electrode 6 far away from the second liquid 2, and the third electrode second part 602 is the part of the third electrode 6 adjacent to the second liquid 2. The third electrode first part 601 extends in a direction away from the axis 8 and the third electrode second part 602.

[0043] For example, reference Figure 1 or Figure 3 , the first electrode first portion 401 and the first electrode second portion 402 are connected to form an obtuse fold line. The third electrode first portion 601 and the third electrode second portion 602 are connected to form an obtuse fold line. In other embodiments, the first electrode 4 and the third electrode 6 may also have other shapes. Figure 3 FIG. 1 is a schematic diagram of another large viewing angle liquid lens structure according to an embodiment of the present invention. Figure 3 As shown, the cross-sectional shape of the first electrode 4 along the plane where the axis 8 is located includes an arc, and the cross-sectional shape of the third electrode 6 along the plane where the axis 8 is located includes an arc. The connection between the first electrode first portion 401 and the first electrode second portion 402, and between the third electrode first portion 601 and the third electrode second portion 602 can be a smooth transition.

[0044] Optional, reference Figure 1 or Figure 4 , the first electrode 4 and the third electrode 6 are symmetrically arranged about the horizontal reference plane 9. The horizontal reference plane 9 is perpendicular to the axis 8. The first electrode 4 and the third electrode 6 are arranged relative to each other and are symmetrical to each other in the extension direction of the axis 8 to ensure uniform distribution of the electric field, thereby improving the optical performance of the large-viewing angle liquid lens structure. It can be understood that when the first electrode 4 and the third electrode 6 are symmetrically arranged about the horizontal reference plane 9, the caliber of the first light opening is equal to the caliber of the third light opening.

[0045] Further, when no power is applied, the first liquid 1 and the third liquid 3 are symmetrically arranged with respect to the horizontal reference plane 9. The upper and lower parts of the second liquid 2 are symmetrically arranged with respect to the horizontal reference plane 9.

[0046] Optionally, refer to Figure 1 , Figure 3 or Figure 4 The second electrode 5 includes a first sub-second electrode 51 and a second sub-second electrode 52 that are arranged opposite to each other. A voltage is applied to the second liquid 2 through the first sub-second electrode 51 and the second sub-second electrode 52, thereby shortening the time for the second liquid 2 to reach a preset charged state, and optimizing the performance and response speed of the wide-angle liquid lens structure.

[0047] Exemplarily, the first sub-second electrode 51 and the second sub-second electrode 52 are spatially arranged in a symmetrical manner relative to the axis 8. The first sub-second electrode 51 and the second sub-second electrode 52 may be on the same plane and perpendicular to the axis 8 of the wide viewing angle liquid lens structure.

[0048] Exemplarily, the first sub-second electrode 51 can be arranged on the left side of the wide-viewing angle liquid lens structure, while the second sub-second electrode 52 is arranged on the right side of the wide-viewing angle liquid lens structure, so that the second liquid 2 carries a positive charge or a negative charge.

[0049] Figure 5 is a schematic top view of a first electrode in an embodiment of the present invention, Figure 6 is a top view schematic diagram of a third electrode in an embodiment of the present invention, referring to Figure 1 , Figure 5 and Figure 6The at least two first electrodes 4 include a first sub-first electrode 41 and a second sub-first electrode 42 that are oppositely disposed. The at least two third electrodes 6 include a first sub-third electrode 61 and a second sub-third electrode 62 that are oppositely disposed.

[0050] Exemplary, reference Figure 2 , Figure 5 and Figure 6 , the first sub-first electrode 41 can be arranged on the left side of the wide-angle liquid lens structure, with a charge opposite to that of the second liquid 2, while the second sub-first electrode 42 is arranged on the right side of the wide-angle liquid lens structure, with the same charge as that of the second liquid 2. The first sub-third electrode 61 can be arranged on the left side of the wide-angle liquid lens structure, with the same charge as that of the second liquid 2, while the second sub-third electrode 62 is arranged on the right side of the wide-angle liquid lens structure, with a charge opposite to that of the second liquid 2. According to the interaction mechanism that ions with the same charge will repel each other and ions with different charges will attract each other, the central symmetry axis of the interface of the second liquid 2 will deviate from the central axis of the cavity, thereby achieving the purpose of changing the mirror optical axis 10.

[0051] The following will take a large viewing angle liquid lens structure as an example, and the voltages applied to the first electrode, the second electrode, and each sub-electrode in the third electrode of the large viewing angle liquid lens structure are described in detail as follows to adjust the direction of the optical axis by changing the tilt direction of the contact surface: the optical axis is a straight line passing through the center of the large viewing angle liquid lens structure and perpendicular to the mirror surface of the large viewing angle liquid lens structure; when the large viewing angle liquid lens structure is in a position such as Figure 7 When the lens is in the state of , the optical axis of the large viewing angle liquid lens structure is the Z axis, and the Z axis is Figure 7 When the large viewing angle liquid lens structure is in the horizontal direction. Figure 8 When the lens is tilted, the optical axis of the large viewing angle liquid lens structure changes, and an angle exists between the optical axis and the Z axis. Figure 8 As shown, the angle between the optical axis of the wide-angle liquid lens structure and the Z axis is 45 degrees. The focal length of the wide-angle liquid lens structure is 1.95, the diameter of the optical lens (Lens) is 1.5mm, the curvature is 1.03, the distance between the pixel and the lens is 1.7mm, and the distance between the lens and the receiving surface is 7.9mm.

[0052] When the same voltage is applied to the first electrode, the second electrode and the third electrode of the large viewing angle liquid lens structure, the voltages of the sub-electrodes in the first electrode, the second electrode and the third electrode are the same. The optical axis of the liquid lens is Figure 7When different voltages are applied to the first electrode, the second electrode, and the third electrode of the large viewing angle liquid lens structure, the inclination of the contact surface formed by the first liquid, the second liquid, and the third liquid will change as follows due to the different voltages between the electrodes: Figure 8 The change shown in the lens, the degree of inclination of the contact surface corresponds to the degree of adjustment of the optical axis. The optical axis is adjusted by applying different voltages to the first electrode, the second electrode and each sub-electrode in the third electrode of the large-angle liquid lens structure.

[0053] Fig. 9 is a top view schematic diagram of another first electrode in an embodiment of the present invention, Fig.10 FIG. 1 is a schematic top view of another third electrode in an embodiment of the present invention. Fig. 9 and Fig.10 As shown, at least two first electrodes 4 further include a third sub-first electrode 43 and a fourth sub-first electrode 44 arranged oppositely. Along the axial direction around the axis 8, the third sub-first electrode 43 is located between the first sub-first electrode 41 and the second sub-first electrode 42, and the fourth sub-first electrode 44 is located between the first sub-first electrode 41 and the second sub-first electrode 42; at least two third electrodes 6 further include a third sub-third electrode 63 and a fourth sub-third electrode 64 arranged oppositely; along the axial direction around the axis 8, the third sub-third electrode 63 is located between the first sub-third electrode 61 and the second sub-third electrode 62, and the fourth sub-third electrode 64 is located between the first sub-third electrode 61 and the second sub-third electrode 62.

[0054] Specifically, the third sub-first electrode 43 and the fourth sub-first electrode 44 are arranged in a circular ring shape around the axial direction of the axis 8, and are located between the first sub-first electrode 41 and the second sub-first electrode 42. The third sub-third electrode 63 and the fourth sub-third electrode 64 are arranged in a circular ring shape around the axial direction of the axis 8, and are located between the first sub-third electrode 61 and the second sub-third electrode 62.

[0055] Exemplarily, the third sub-first electrode 43 and the fourth sub-first electrode 44 can be set to be equidistant from the first sub-first electrode 41 and the second sub-first electrode 42 to form a complete circular ring structure, ensuring that an ideal liquid shape change can be generated when a voltage is applied.

[0056] It should be noted that the more sub-electrodes the first electrode 4 and the third electrode 6 respectively include, the more accurate the adjustment of the curvature and the optical axis direction of the corresponding large-angle liquid lens structure. It should also be noted that those skilled in the art can set the number of sub-electrodes respectively included in the first electrode 4 and the third electrode 6 according to actual needs, and the present invention does not limit this.

[0057] Optionally, the first liquid 1 and the third liquid 3 both include oily liquids. The materials of the first liquid 1 and the third liquid 3 are the same or different.

[0058] In this embodiment, the oily liquid can be specifically understood as a liquid with good optical permeability and appropriate viscosity. Optionally, the oily liquid can be mineral oil, silicone oil or other synthetic oils, which can not only change shape rapidly under the action of an electric field, but also maintain high optical quality.

[0059] For example, the first liquid 1 and the third liquid 3 can be made of the same silicone oil (such as polydimethylsiloxane, PDMS), or different oily liquids can be selected, such as the first liquid 1 is mineral oil and the third liquid 3 is a specific synthetic oil. This selection can be adjusted according to application requirements to optimize the performance and response speed of the large viewing angle liquid lens structure.

[0060] Optionally, the wide-viewing angle liquid lens structure further includes a dielectric layer 7 , which surrounds the first liquid 1 , the second liquid 2 and the third liquid 3 , and is located between the first electrode 4 and the first liquid 1 , and between the third electrode 6 and the third liquid 3 .

[0061] In this embodiment, the dielectric layer 7 can be specifically understood as a material with good insulation properties, which is used to isolate the electrode from the liquid to avoid short circuits between the electrodes and ensure effective distribution of the electric field. Optionally, the dielectric layer can be made of materials such as polyimide (PI), polytetrafluoroethylene (PTFE) or polyurethane.

[0062] Exemplarily, the selection of different materials for the dielectric layer 7 can be optimized as needed to achieve the best optical effect and electric field control, which is not limited in the present invention.

[0063] Similar to the above embodiment, the present invention also provides an optical system, which adopts a large viewing angle liquid lens structure. Thus, the optical system has the beneficial effects of the above large viewing angle liquid lens structure. The optical system can be, for example, an optical lens, or other structures applied to liquid lenses.

[0064] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A large viewing angle liquid lens structure, characterized in that: include: A first liquid, a second liquid and a third liquid are sequentially arranged along the axis, wherein the second liquid is immiscible with the first liquid and the third liquid; The first liquid and the third liquid are insulating liquids, and the second liquid includes an ionic liquid; at least two first electrodes located at the periphery of the first liquid around the axis; at least one second electrode, electrically connected to the ionic liquid and configured to charge the ionic liquid; At least two third electrodes are located at the periphery of the third liquid around the axis.

2. The wide viewing angle liquid lens structure according to claim 1, characterized in that: Along the extending direction of the axis, the second electrode is located between the first electrode and the third electrode.

3. The wide viewing angle liquid lens structure according to claim 2, characterized in that: The end of the first electrode away from the second liquid is surrounded to form a first light opening; The second electrode forms a second light opening around the second liquid; The end of the third electrode away from the second liquid is surrounded to form a third light opening; The aperture of the first light-transmitting opening is larger than the aperture of the second light-transmitting opening, and / or the aperture of the third light-transmitting opening is larger than the aperture of the second light-transmitting opening.

4. The wide viewing angle liquid lens structure according to claim 3, characterized in that: The aperture of the first light-transmitting opening is greater than or equal to the aperture of the third light-transmitting opening.

5. The wide viewing angle liquid lens structure according to claim 3, characterized in that: The cross-sectional shape of the first electrode along the plane where the axis is located includes a first electrode first portion and a first electrode second portion, and both the first electrode first portion and the first electrode second portion are straight line segments; And / or, a cross-sectional shape of the third electrode along the plane where the axis is located includes a third electrode first portion and a third electrode second portion, and both the third electrode first portion and the third electrode second portion are straight line segments.

6. The wide viewing angle liquid lens structure according to claim 2, characterized in that: The first electrode and the third electrode are arranged symmetrically with respect to a horizontal reference plane; The horizontal reference plane is perpendicular to the axis.

7. The wide viewing angle liquid lens structure according to claim 2, characterized in that: The second electrode includes a first sub-second electrode and a second sub-second electrode that are oppositely disposed.

8. The wide viewing angle liquid lens structure according to claim 1, characterized in that: At least two of the first electrodes include a first sub-first electrode and a second sub-first electrode that are arranged opposite to each other; The at least two third electrodes include a first sub-third electrode and a second sub-third electrode that are oppositely disposed.

9. The wide viewing angle liquid lens structure according to claim 8, characterized in that: At least two of the first electrodes further include a third sub-first electrode and a fourth sub-first electrode which are arranged opposite to each other; along the axial direction around the axis, the third sub-first electrode is located between the first sub-first electrode and the second sub-first electrode, and the fourth sub-first electrode is located between the first sub-first electrode and the second sub-first electrode; At least two of the third electrodes also include a third sub-third electrode and a fourth sub-third electrode arranged opposite to each other; along the axial direction around the axis, the third sub-third electrode is located between the first sub-third electrode and the second sub-third electrode, and the fourth sub-third electrode is located between the first sub-third electrode and the second sub-third electrode.

10. The wide viewing angle liquid lens structure according to claim 1, characterized in that: The first liquid and the third liquid both include oily liquids; The first liquid and the third liquid may be made of the same or different materials.

11. The wide viewing angle liquid lens structure according to claim 1, characterized in that: A dielectric layer is also included, which surrounds the first liquid, the second liquid, and the third liquid, and is located between the first electrode and the first liquid, and between the third electrode and the third liquid.

12. An optical system, characterized in that: The invention comprises the wide-viewing angle liquid lens structure as described in any one of claims 1 to 11.

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