A multi-focal liquid lens and an optical mode switching system thereof

Abstract

The application provides a multi-focus liquid lens and an optical mode switching system thereof, and belongs to the field of optical imaging.The multi-focus liquid lens comprises a liquid storage cavity with an upper opening and a main body core, and the main body core covers and is fixed at the upper opening of the liquid storage cavity.The main body core comprises, from bottom to top, a non-porous transparent elastic film, a perforated hard plate and at least one layer of perforated transparent elastic film.After the liquid storage cavity is filled with optical liquid, the driving film produces differential limited deformation to form multiple focal points, and the injection amount of the optical liquid is controlled to adjust the focal length.The optical mode switching system based on the multi-focus liquid lens comprises a focusing module, and the focusing module comprises an auxiliary core composed of multiple independently controlled electrochromic layers.The color-changing regions in different electrochromic layers are different, the light transmittance of different color-changing regions is changed, the deformation regions of the perforated transparent elastic film or the non-porous transparent elastic film are selectively shielded, and the focal point switching of the liquid lens is realized.

Description

Technical Field

[0001] This invention belongs to the field of optical imaging, specifically a multifocal liquid lens and its optical mode switching system. Background Technology

[0002] With the advancement of science and technology, the field of optical imaging has placed higher demands on the imaging quality, zoom response speed, and structural characteristics of optical systems. Liquid lenses, as key components of dynamic optical imaging systems, are widely used in intelligent monitoring, virtual reality devices, and miniaturized camera modules.

[0003] Traditional technologies for achieving zoom in liquid lenses mainly rely on two methods: mechanical zoom and liquid zoom lenses. Mechanical zoom switches focus by moving the lens group with a micro-motor or piezoelectric actuator, using a precision sliding rail structure to alternately align the telephoto and short-focus lens units. However, this approach suffers from bulkiness (thickness typically >5mm), limited response speed (switching time ≥200ms), and reliability issues due to mechanical wear. Liquid zoom lenses, on the other hand, achieve zoom by controlling the curvature of the liquid-liquid interface based on the electrowetting effect or fluid pressure. While this method avoids mechanical movement, it suffers from poor temperature stability (operating range -10~60℃), complex driving voltage (requiring alternating application of high-frequency AC signals and DC bias), and performance degradation due to liquid evaporation after long-term use.

[0004] Electrochromic materials are gradually being introduced into optical device design because their optical properties can be modulated by an electric field. By coating an electrochromic layer on the surface of a lens, the intensity of incident light can be dynamically controlled. However, this method can only adjust the light throughput at a single focal length and cannot achieve physical switching between long and short focal length optical paths. Furthermore, it does not solve the problem of the integrated architecture between bifocal lenses and electrochromic layers. Summary of the Invention

[0005] To address the problems existing in the zooming process of liquid lenses in the prior art, this invention provides a multifocal liquid lens and its optical mode switching system. This invention improves upon existing liquid lenses and provides a corresponding optical mode switching system.

[0006] The present invention provides a multifocal liquid lens, comprising a liquid storage cavity with an upper opening and a main body core, wherein the main body core covers and is fixed to the upper opening of the liquid storage cavity;

[0007] The main core comprises, from bottom to top, a non-porous transparent elastic film, a perforated rigid plate, and at least one layer of perforated transparent elastic film; the perforated transparent elastic film and the perforated rigid plate are provided with at least one coaxial through-hole combination; the coaxial through-hole combination includes through-holes provided on the perforated transparent elastic film and through-holes provided on the perforated rigid plate, and the diameter of the through-hole on the perforated transparent elastic film is smaller than the diameter of the through-hole on the perforated rigid plate; the diameters of the through-holes on different perforated transparent elastic films are different, and the diameter of the through-hole on the upper layer is smaller than the diameter of the through-hole on the lower layer;

[0008] After optical liquid is injected into the reservoir, it drives the non-porous transparent elastic film and the open-pore transparent elastic film to produce different restricted deformations. When the light source is incident on the multifocal liquid lens from below, different deformations correspond to different focal points. By adjusting the amount of optical liquid injected into the reservoir, the curvature of the deformation area can be changed, thereby achieving the adjustment of the focal length.

[0009] Furthermore, when the perforated transparent elastic film is a single layer and has only one coaxial through-hole combination, the multifocal liquid lens is a bifocal liquid lens.

[0010] The main core has a three-layer structure, which includes, from bottom to top, a non-porous transparent elastic film, a perforated rigid plate, and a first perforated transparent elastic film; a first through hole is provided at the center of the first perforated transparent elastic film, and a second through hole is provided at the center of the perforated rigid plate. The first through hole and the second through hole are coaxially arranged, and the diameter of the first through hole is smaller than the diameter of the second through hole.

[0011] Furthermore, when the perforated transparent elastic film is a single layer and has multiple coaxial through-holes, the multifocal liquid lens is a bifocal liquid lens array.

[0012] The main core has a three-layer structure, which includes, from bottom to top, a non-porous transparent elastic film, a perforated rigid plate, and a first perforated transparent elastic film; the first perforated transparent elastic film and the perforated rigid plate are provided with at least 9 coaxial through holes; the coaxial through hole combination includes a first through hole provided on the first perforated transparent elastic film and a second through hole provided on the perforated rigid plate, and the diameter of the first through hole is smaller than the diameter of the second through hole.

[0013] The first perforated transparent elastic film is provided with at least 9 first through holes, and the perforated rigid plate is provided with at least 9 second through holes. The first through holes and the second through holes in the coaxial through hole combination are coaxially arranged.

[0014] Furthermore, when the perforated transparent elastic film consists of two layers and only one coaxial through-hole, the multifocal liquid lens becomes a trifocal liquid lens.

[0015] The main body core has a four-layer structure, which, from bottom to top, includes a non-porous transparent elastic film, a perforated rigid plate, a first perforated transparent elastic film, and a second perforated transparent elastic film.

[0016] The first perforated transparent elastic film has a first through hole at its center; the perforated rigid plate has a second through hole; the second perforated transparent elastic film has a third through hole at its center; the first through hole, the second through hole, and the third through hole are coaxially arranged, and the diameter of the first through hole is smaller than the diameter of the second through hole, and the diameter of the third through hole is smaller than the diameter of the first through hole.

[0017] In addition to the multifocal liquid lens provided by the present invention, the present invention also provides an optical mode switching system based on the multifocal liquid lens, the optical mode switching system including a focus switching module and the multifocal liquid lens; the focus switching module is installed below the multifocal liquid lens.

[0018] The focus-changing module includes an auxiliary core composed of multiple independently controlled electrochromic layers. Different electrochromic layers have different color-changing areas. By changing the light transmittance of different color-changing areas, the deformation position of the perforated transparent elastic film or the non-perforated transparent elastic film is selectively blocked, thereby realizing the focus switching of the liquid lens.

[0019] Furthermore, this application provides an optical mode switching system based on a bifocal liquid lens, including a focus-switching module and a bifocal liquid lens; the focus-switching module is installed below the bifocal liquid lens.

[0020] The focus-changing module includes an auxiliary core, which comprises, from top to bottom, a first ITO glass layer, a first electrochromic layer, a second ITO glass layer, a second electrochromic layer, and a third ITO glass layer.

[0021] The first ITO glass layer retains a circular conductive film layer after etching at its center; the first electrochromic layer is a substrate with a circular color-changing region embedded in it; the second ITO glass layer has conductive film material deposited on both sides; the second electrochromic layer is a substrate with an annular color-changing region embedded in it; the third ITO glass layer has a circular hollow conductive film layer after etching at its center; both the circular color-changing region and the annular color-changing region are made of electrochromic material.

[0022] The first through-hole, the second through-hole, the circular conductive film layer, the circular color-changing area, the annular color-changing area, and the circular perforated conductive film layer are all coaxially arranged. The radius of the circular conductive film layer is the same as the diameter of the circular color-changing area, and is larger than the diameter of the first through-hole but smaller than the outer diameter of the annular color-changing area. The diameter of the first through-hole, the inner diameter of the annular color-changing area, and the diameter of the perforated portion of the circular perforated conductive film layer are the same. The diameter of the second through-hole is the same as the outer diameter of the annular color-changing area. By changing the light transmittance of the first electrochromic layer and the second electrochromic layer, the deformation area of ​​the non-porous transparent elastic film or the first perforated transparent elastic film is selectively blocked, thereby achieving focus switching of the bifocal liquid lens.

[0023] Furthermore, for the optical mode switching system of the bifocal liquid lens, the light transmission state of the first electrochromic layer is changed by applying a voltage between the first ITO glass layer and the second ITO glass layer; and the light transmission state of the second electrochromic layer is changed by applying a voltage between the second ITO glass layer and the third ITO glass layer.

[0024] Beneficial effects:

[0025] 1) This invention provides a novel liquid lens, which uses an external device to drive optical liquid to be injected into or discharged from a storage chamber, thereby changing the liquid pressure inside the chamber and driving a perforated transparent elastic film and a non-perforated transparent elastic film to produce differential restricted deformation at the through hole of a perforated rigid plate, forming a liquid lens with multiple focal points and adjustable focal length.

[0026] 2) This invention also provides an optical mode switching system based on a multifocal liquid lens, which combines a liquid lens with an electrochromic material. Utilizing a stacked structure consisting of a patterned ITO glass layer and a substrate containing the electrochromic material, electrodes are selectively activated to independently control the transmittance of the electrochromic region, blocking deformation within different ranges and achieving optical mode switching. Focal length switching is achieved through electric field modulation, offering advantages such as high image quality, low power consumption, and no mechanical moving parts.

[0027] 3) The optical mode switching system based on multifocal liquid lens provided by the present invention has a compact structure and the advantages of simple structure and rapid optical mode switching. Attached Figure Description

[0028] Figure 1 This is a cross-sectional view of the bifocal liquid lens in Example 1;

[0029] Figure 2 The images show the deformation of the perforated transparent elastic film and the non-perforated transparent elastic film when the bifocal liquid lens in Example 1 is working.

[0030] Figure 3 This is a diagram showing the light-gathering effect of the bifocal liquid lens during operation in Example 1;

[0031] Figure 4 This is a diagram showing the light-gathering effect of the trifocal liquid lens during operation in Example 2;

[0032] Figure 5 This is a structural slice diagram of the optical mode switching system based on a bifocal liquid lens in Example 3;

[0033] Figure 6 This is a schematic diagram of the focus-changing module in Example 3;

[0034] Figure 7 This is a cross-sectional view of the structure of the bifocal liquid lens in Example 4. Detailed Implementation

[0035] To make the technical means of implementing the present invention easier to understand, the present invention will be further described in detail below with reference to the accompanying drawings. However, this is not intended to limit the scope of the invention as defined by the claims of this application. The elements in the drawings are not necessarily drawn to scale, but rather to illustrate the principles of the embodiments.

[0036] Example 1

[0037] like Figure 1 As shown, this embodiment provides a bifocal liquid lens, including a liquid storage cavity 2 with an open top, a main body core 1, and a fixing ring 3. The main body core 1 covers the opening of the liquid storage cavity 2 and is fixed to the liquid storage cavity 2 by the fixing ring 3. The groove of the fixing ring 3 is tightly attached to the side wall of the liquid storage cavity 2, thus firmly fixing the main body core 1 to the opening of the liquid storage cavity 2.

[0038] The main core 1 includes an upper layer of first perforated transparent elastic film 1-1, a middle layer of perforated rigid plate 1-2, and a lower layer of non-perforated transparent elastic film 1-3. The first perforated transparent elastic film 1-1, the perforated rigid plate 1-2, and the non-perforated transparent elastic film 1-3 constitute a sandwich structure.

[0039] The first perforated transparent elastic film 1-1 has a first through hole, and the perforated rigid plate 1-2 has a second through hole. The first through hole and the second through hole are coaxially arranged, and the diameter of the first through hole is smaller than that of the second through hole.

[0040] The liquid storage chamber 2 is provided with an injection port 2-1 and a drain port 2-2, and the liquid storage chamber 2 is used to store optical liquid.

[0041] In use, an external device drives the optical liquid to be injected into or discharged from the reservoir 2, thereby changing the liquid pressure in the reservoir 2. This drives the first perforated transparent elastic film 1-1 and the non-perforated transparent elastic film 1-3 to produce differential restricted deformation, thus realizing a long and short bifocal liquid lens with adjustable focal length.

[0042] In this embodiment, the specific parameter settings are as follows:

[0043] The liquid storage chamber 2 is a hollow cuboid with a height of 10 mm and a square cross-section with a side length of 30 mm. It is made of high borosilicate glass. The injection port 2-1 and the drain port 2-2 are circular through holes with a radius of 1.5 mm, located on opposite side walls of the liquid storage chamber 2.

[0044] The non-porous transparent elastic film 1-3 is square with a side length of 20mm and a thickness of 0.1mm. The preferred material for the film is PDMS (polydimethylsiloxane).

[0045] The perforated rigid plate 1-2 is square with a side length of 20mm and a thickness of 0.5mm. It is made of high borosilicate glass and has a circular through hole with a radius of 8mm in the center.

[0046] The first perforated transparent elastic film 1-1 is square with a side length of 20mm and a thickness of 0.5mm. The radius of the through hole in the hollow part is 4mm, and the material is PDMS (polydimethylsiloxane).

[0047] The optical fluid is propyl silicone oil (C3H4Cl3F3Si), whose refractive index matches that of the perforated rigid plate 1-2.

[0048] The principle of bifocal lens bifocal formation: During operation, when the optical liquid flows into the reservoir 2 from the injection port 2-1, the liquid exerts upward pressure on the non-porous transparent elastic film 1-3, causing it to deform. Simultaneously, the non-porous transparent elastic film 1-3 exerts pressure on the first perforated transparent elastic film 1-1 through the perforated rigid plate 1-2, causing it to bulge. The first perforated transparent elastic film 1-1 also exerts a reaction force on the bulging portion of the non-porous transparent elastic film 1-3, resulting in a bifocal shape. Figure 2 The lens surface shape is shown. In this case, due to the different curvatures of the central and edge portions of the bifocal liquid lens, the converging effect on light rays is as follows: Figure 3 As shown, the central portion focuses on plane b, while the edge portion focuses on plane a, thus creating a bifocal phenomenon. By changing the volume of optical liquid flowing into the reservoir, the degree of film deformation can be controlled, thereby altering the surface parameters, expanding the focusing range, and increasing the application scenarios of the device.

[0049] Example 2

[0050] This embodiment provides a trifocal liquid lens. Based on embodiment 1, a second perforated transparent elastic film 1-4 with a side length of 20 mm and a thickness of 0.5 mm is covered on the first perforated transparent elastic film 1-1. The radius of the central opening is 6 mm. A perforated rigid plate 1-2 can also be added between the first perforated transparent elastic film 1-1 and the second perforated transparent elastic film 1-4.

[0051] When the optical liquid flows into the reservoir 2 from the injection port 2-1, the liquid exerts upward pressure on the non-porous transparent elastic film 1-3, causing it to deform. Simultaneously, the non-porous transparent elastic film 1-3 exerts pressure on the first perforated transparent elastic film 1-1 and the second perforated transparent elastic film 1-4, causing them to bulge. At the same time, the first perforated transparent elastic film 1-1 and the second perforated transparent elastic film 1-4 also exert reaction forces on the non-porous transparent elastic film 1-3, forming three regions with different curvatures. Each curvature corresponds to a focal point, thus producing a trifocal phenomenon. Figure 4 As shown.

[0052] Example 3

[0053] like Figure 5 As shown, this embodiment provides an optical mode switching system based on a bifocal liquid lens; the optical mode switching system based on a bifocal liquid lens includes a focus-changing module and the bifocal liquid lens in Embodiment 1.

[0054] In Example 1, the bifocal liquid lens can be considered a focusing module used to create telephoto and short focal lengths. By adjusting the amount of optical liquid injected into the reservoir, the focal lengths of the telephoto and short focal lengths can be controlled. The focus-changing module is used to select whether to use a telephoto or short focal length.

[0055] The focus-changing module is installed below the focusing module. The focus-changing module includes an auxiliary core 4 composed of a first ITO glass layer 4-1, a first electrochromic layer 4-2, a second ITO glass layer 4-3, a second electrochromic layer 4-4, and a third ITO glass layer 4-5. The first ITO glass layer 4-1, the first electrochromic layer 4-2, the second ITO glass layer 4-3, the second electrochromic layer 4-4, and the third ITO glass layer 4-5 are arranged sequentially from top to bottom.

[0056] The first ITO glass layer 4-1 retains a circular conductive film layer formed by etching at its center. The first ITO glass layer 4-1 is a transparent ITO glass layer with a thickness of 1~2mm and a side length of 30mm. The radius of the circular conductive film layer is 4.55mm, and the material of the circular conductive film layer is indium-tin oxide.

[0057] The first electrochromic layer 4-2 is a substrate with a circular color-changing region embedded in it. The substrate is 10 mm high and 30 mm long on each side, and the substrate material is high borosilicate glass. The radius of the circular color-changing region is 4.55 mm and the height is 10 mm. The circular color-changing region is made of tungsten trioxide, an electrochromic material, and the circular color-changing region and the upper side of the substrate are located in the same plane.

[0058] The second ITO glass layer 4-3 has conductive film material deposited on both sides. The second ITO glass layer 4-3 has a thickness of 1~2mm and a side length of 30mm, and conductive film material, which is indium tin oxide, is deposited on both sides.

[0059] The second electrochromic layer 4-4 is a substrate with an embedded annular color-changing region; the substrate is 10mm high and 30mm long, the substrate material is high borosilicate glass, the inner radius of the annular color-changing region is 4mm, the outer radius is 8mm, and the height is 10mm. The annular color-changing region is made of tungsten trioxide, and the circular color-changing region and the upper side of the substrate are located in the same plane.

[0060] After etching the center of the third ITO glass layer 4-5, a circular hollow conductive film layer is formed; the thickness of the third ITO glass layer 4-5 is 1~2mm, the side length is 30mm, the radius of the circle of the hollow conductive film layer is 4mm, and the material of the circular hollow conductive film layer is indium tin oxide.

[0061] The dimensional relationships of the through holes, electroplating layers, and color-changing areas in the focusing module and focus changing module are as follows:

[0062] 1) The first through hole, the second through hole, the circular conductive film layer, the circular color-changing area, the annular color-changing area, and the circular hollow conductive film layer are all coaxially arranged.

[0063] 2) The radius of the circular conductive film layer and the diameter of the circular color-changing area are the same and larger than the diameter of the first through hole, which is smaller than the outer diameter of the annular color-changing area.

[0064] 3) The diameter of the first through hole, the inner diameter of the annular color-changing area, and the diameter of the hollowed-out part of the circular hollow conductive film layer are the same.

[0065] 4) The diameter of the second through hole is the same as the outer diameter of the annular discoloration zone.

[0066] By altering the light transmittance of the first electrochromic layer 4-2 and the second electrochromic layer 4-4, partial blocking of the liquid lens is achieved, thereby enabling free switching between long and short focal length optical modes. For example... Figure 6As shown, an external electric field is applied between the circular conductive film layer of the first ITO glass layer 4-1 and the conductive film of the second ITO glass layer 4-3, which can change the transmittance of the first electrochromic layer 4-2 to block near-focus; an external electric field is applied between the circular perforated conductive film layer of the second ITO glass layer 4-3 and the circular perforated conductive film layer of the third ITO glass layer 4-5, which can change the transmittance of the second electrochromic layer 4-4 to block far-focus.

[0067] Example 4

[0068] like Figure 7 As shown, based on Example 1, the through holes of the first perforated transparent elastic film 1-1 and the perforated rigid plate 1-2 are densely packed to form a dual-focus liquid lens array.

[0069] Specifically, nine coaxial through-hole combinations are provided on the first perforated transparent elastic film 1-1 and the perforated rigid plate 1-2; the coaxial through-hole combination includes a first through-hole provided on the first perforated transparent elastic film 1-1 and a second through-hole provided on the perforated rigid plate 1-2, wherein the diameter of the first through-hole is smaller than the diameter of the second through-hole.

Claims

1. A multi-focal liquid lens characterized by, The multifocal liquid lens includes a liquid storage cavity with an opening at the top and a main body core, with the main body core covering and fixed at the top opening of the liquid storage cavity. The main core comprises, from bottom to top, a non-porous transparent elastic film, a perforated rigid plate, and at least one layer of perforated transparent elastic film; the perforated transparent elastic film and the perforated rigid plate are provided with at least one coaxial through hole combination; the coaxial through hole combination includes through holes provided on the perforated transparent elastic film and through holes provided on the perforated rigid plate, and the diameter of the through hole on the perforated transparent elastic film is smaller than the diameter of the through hole on the perforated rigid plate; After optical liquid is injected into the reservoir, it drives the non-porous transparent elastic film and the open-pore transparent elastic film to produce different restricted deformations. When the light source is incident on the multifocal liquid lens from below, different deformations correspond to different focal points. By adjusting the amount of optical liquid injected into the reservoir, the curvature of the deformation is changed, and the focal length can be adjusted.

2. The multi-focal liquid lens of claim 1, wherein, When the perforated transparent elastic film is a single layer and has only one coaxial through-hole, the multifocal liquid lens is a bifocal liquid lens. The main core comprises, from bottom to top, a non-porous transparent elastic film, a perforated rigid plate, and a first perforated transparent elastic film; a first through hole is provided at the center of the first perforated transparent elastic film, and a second through hole is provided at the center of the perforated rigid plate; the first through hole and the second through hole are coaxially arranged, and the diameter of the first through hole is smaller than the diameter of the second through hole.

3. The multi-focal liquid lens of claim 1, wherein, When the perforated transparent elastic film is a single layer and has multiple coaxial through-holes, the multifocal liquid lens is a bifocal liquid lens array. The main body core comprises, from bottom to top, a non-porous transparent elastic film, a perforated rigid plate, and a first perforated transparent elastic film; The first perforated transparent elastic film and the perforated rigid plate are provided with at least 9 coaxial through holes; the coaxial through hole combination includes a first through hole provided on the first perforated transparent elastic film and a second through hole provided on the perforated rigid plate, wherein the diameter of the first through hole is smaller than the diameter of the second through hole.

4. The multifocal liquid lens according to claim 1, characterized in that, When the perforated transparent elastic film has two layers and only one coaxial through-hole combination, the multifocal liquid lens is a trifocal liquid lens. The main body core comprises, from bottom to top, a non-porous transparent elastic film, a perforated rigid plate, a first perforated transparent elastic film, and a second perforated transparent elastic film; The first perforated transparent elastic film has a first through hole at its center; the perforated rigid plate has a second through hole; the second perforated transparent elastic film has a third through hole at its center; the first through hole, the second through hole, and the third through hole are coaxially arranged, and the diameter of the first through hole is smaller than the diameter of the second through hole, and the diameter of the third through hole is smaller than the diameter of the first through hole.

5. An optical mode switching system based on a multifocal liquid lens, characterized in that, The optical mode switching system includes a focus-changing module and the multifocal liquid lens as described in claim 1; the focus-changing module is installed below the multifocal liquid lens; The focus-changing module includes an auxiliary core composed of multiple independently controlled electrochromic layers. The color-changing areas in different electrochromic layers are different. By changing the light transmittance of different color-changing areas, the deformation areas of the perforated transparent elastic film or the non-perforated transparent elastic film are selectively blocked, thereby realizing the focus switching of the liquid lens.

6. An optical mode switching system based on a bifocal liquid lens, characterized in that, The optical mode switching system includes a focus switching module and the multifocal liquid lens as described in claim 2, wherein the multifocal liquid lens is a bifocal liquid lens; The focus-changing module is installed below the bifocal liquid lens; The focus-changing module includes an auxiliary core, which includes a first ITO glass layer, a first electrochromic layer, a second ITO glass layer, a second electrochromic layer and a third ITO glass layer arranged sequentially from top to bottom. The first ITO glass layer retains the center area after etching to form a circular conductive film layer; the first electrochromic layer is a substrate with a circular color-changing area embedded; the two sides of the second ITO glass layer are coated with conductive film material; the second electrochromic layer is a substrate with an annular color-changing area embedded; the third ITO glass layer has a circular hollow conductive film layer formed after etching the center area; both the circular color-changing area and the annular color-changing area are made of electrochromic material. The first through hole, the second through hole, the circular conductive film layer, the circular color-changing area, the annular color-changing area, and the circular perforated conductive film layer are all coaxially arranged; the radius of the circular conductive film layer is the same as the diameter of the circular color-changing area, and is larger than the diameter of the first through hole but smaller than the outer diameter of the annular color-changing area; the diameter of the first through hole, the inner diameter of the annular color-changing area, and the diameter of the perforated part of the circular perforated conductive film layer are the same; the diameter of the second through hole is the same as the outer diameter of the annular color-changing area. By changing the light transmittance of the first and second electrochromic layers, the deformation position of the non-porous transparent elastic film or the first open-pore transparent elastic film is selectively blocked, thereby achieving focus switching of the bifocal liquid lens.

7. The optical mode switching system according to claim 6, characterized in that, The light transmission state of the first electrochromic layer is changed by applying a voltage between the first ITO glass layer and the second ITO glass layer; the light transmission state of the second electrochromic layer is changed by applying a voltage between the second ITO glass layer and the third ITO glass layer.

Images