Double-electrode-layer blue-phase liquid crystal lens device and focusing method

Abstract

The invention relates to the technical field of liquid crystal lenses, in particular to a dual-electrode-layer blue-phase liquid crystal lens device and a focusing method.The dual-electrode-layer blue-phase liquid crystal lens device comprises an upper glass substrate, a grounding electrode layer, a blue-phase liquid crystal layer, a high dielectric layer, a first driving electrode layer, a second driving electrode layer and a lower glass substrate which are sequentially arranged; the gap between the adjacent first driving electrodes is equal to the width of the second driving electrodes, and the first driving electrodes and the second driving electrodes are arranged in a staggered mode. The invention also relates to a focusing method which comprises the following steps: S1, applying a driving voltage which is gradually reduced from the edge of the lens to the center of the lens to the first driving electrode layer and the second driving electrode layer; s2, the driving voltage is transmitted to the blue phase liquid crystal layer to form a vertical electric field; s3, the blue phase liquid crystal layer forms refractive index gradient distribution; and S4, adjusting the driving voltage to change the refractive index distribution of the blue phase liquid crystal layer. According to the invention, the abnormal projection of local refractive index is effectively inhibited, so that the refractive index distribution is closer to an ideal curve.

Description

Technical Field

[0001] This invention relates to the technical field of liquid crystal lenses, and more specifically, to a dual-electrode layer blue phase liquid crystal lens device and focusing method. Background Technology

[0002] Blue phase liquid crystal lenses have become a cutting-edge research area in optoelectronics in recent years, attracting widespread attention. Blue phase liquid crystals are metastable liquid crystal phases intermediate between isotropic and cholesteric phases. Their self-assembled three-dimensional cubic structures are periodically arranged at the nanoscale, exhibiting unique birefringence and fast response characteristics. Compared to traditional nematic liquid crystals, blue phase liquid crystals achieve optical isotropy without an alignment layer, offer a wider viewing angle and higher transmittance, and do not require stacking two liquid crystal layers to achieve polarization independence. Based on the Kerr effect, blue phase liquid crystals can generate dynamic refractive index modulation under an applied electric field. Through design, continuous focusing of the lens can be achieved. This characteristic makes them a potential replacement for mechanical zoom systems in fields such as AR / VR near-eye displays, automated stereoscopic display systems, and adaptive optics, making them of great research value compared to traditional non-focusable lenses.

[0003] Existing blue phase liquid crystal lenses often employ a multi-electrode structure, including an upper glass substrate, an upper electrode layer, a blue phase liquid crystal layer, a high-dielectric layer, a lower electrode layer, and a lower glass substrate, with indium tin oxide (ITO) as the electrode material. However, in the refractive index curve of a multi-electrode blue phase liquid crystal lens, gaps between the multiple electrodes cause a refractive index bulge. This bulge prevents light from converging at the ideal focal point after passing through the lens, resulting in light spot diffusion or distortion, and reducing image resolution. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies where refractive index protrusion leads to light spot diffusion or distortion, reducing imaging resolution. This invention provides a dual-electrode layer blue phase liquid crystal lens device and focusing method that significantly suppresses refractive index protrusion, optimizes the electric field distribution in the blue phase liquid crystal layer, and makes the refractive index distribution closer to the ideal curve.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A dual-electrode layer blue phase liquid crystal lens device is provided, comprising an upper glass substrate, a ground electrode layer, a blue phase liquid crystal layer, a high dielectric layer, a first driving electrode layer, a second driving electrode layer, and a lower glass substrate arranged in sequence. The first driving electrode layer includes multiple sets of horizontally arranged first driving electrodes, and the second driving electrode layer includes multiple sets of horizontally arranged second driving electrodes. The gap between adjacent first driving electrodes is equal to the width of the second driving electrode, and the first driving electrodes and the second driving electrodes are staggered in the vertical direction.

[0006] The dual-electrode blue phase liquid crystal lens device of the present invention exhibits optical isotropy in the blue phase liquid crystal layer when no voltage is applied to the first and second driving electrode layers. When a voltage is applied to the first and second driving electrode layers, a vertical electric field is generated in the blue phase liquid crystal layer. According to the extended Kerr effect model, the electric field-induced birefringence of the blue phase liquid crystal layer can be obtained. The upper and lower glass substrates support and encapsulate the internal ground electrode layer, blue phase liquid crystal layer, high dielectric layer, first driving electrode layer, and second driving electrode layer, ensuring that each functional layer maintains a fixed relative position and stability. The driving voltage is transmitted to the blue phase liquid crystal layer through the high dielectric layer, forming a vertical electric field with the cooperation of the ground electrode layer, causing the blue phase liquid crystal layer to produce a smooth refractive index gradient distribution, thereby achieving light focusing. By adjusting the driving voltage value, the refractive index distribution of the blue phase liquid crystal layer can be dynamically changed to achieve continuous focusing. When a driving voltage is applied to the first driving electrode layer and the second driving electrode layer, since the gap between adjacent first driving electrodes is equal to the width of the second driving electrode, and the first driving electrode and the second driving electrode are staggered in the vertical direction, the two electrode layers form a complementary coverage, eliminating the electric field blind zone caused by the electrode gap, significantly suppressing the refractive index protrusion, optimizing the electric field distribution in the blue phase liquid crystal layer, and making the refractive index distribution closer to the ideal curve.

[0007] Furthermore, the first driving electrode layer is disposed at the bottom end of the high-dielectric layer, and the second driving electrode layer is disposed at the top end of the lower glass substrate, with the bottom end of the high-dielectric layer bonded to the top end of the lower glass substrate. Through a separate manufacturing process, the first driving electrode layer is etched inside the high-dielectric layer, and the second driving electrode layer is independently etched onto the surface of the lower glass substrate. This maintains the continuity of the electric field coverage while preserving the staggered electrode structure, reducing the complexity of the manufacturing process and achieving equivalent optical performance with a simpler method. By directly bonding the bottom end of the high-dielectric layer to the top end of the lower glass substrate, the first and second driving electrode layers are tightly bonded in the vertical direction, eliminating vertical gaps between the electrode layers, ensuring continuous electric field transmission, and suppressing refractive index protrusion.

[0008] Furthermore, both the first and second driving electrode layers are etched within the high-dielectric layer, with the first driving electrode layer stacked above the second driving electrode layer and in close contact in the vertical direction. By etching both the first and second driving electrode layers inside the high-dielectric layer, the electric field coupling efficiency between the two electrodes is enhanced, allowing the driving voltage to be transferred to the blue phase liquid crystal layer more efficiently, ensuring the vertical alignment accuracy of the misaligned electrode structure, and further optimizing the continuity of the electric field distribution. By directly stacking the first driving electrode layer above the second driving electrode layer, making the first and second driving electrode layers in close contact in the vertical direction, the vertical gap between the electrode layers is eliminated, ensuring the continuity of electric field transmission, suppressing refractive index protrusion, enhancing the electric field coupling efficiency between the electrodes, and further eliminating electric field distortion.

[0009] Furthermore, the high-dielectric layer is a fully polymer-infiltrating composite material, comprising 70%–80% by volume poly(vinylidene fluoride-trifluoroethylene-trifluorochloroethylene) and 20%–30% by volume polyaniline. By combining poly(vinylidene fluoride-trifluoroethylene-trifluorochloroethylene) with polyaniline at specific volume fractions, a fully polymer-infiltrating structure with a high dielectric constant is formed. This allows the high-dielectric layer to efficiently share the driving voltage, reduce abrupt changes in the electric field gradient of the blue phase liquid crystal layer, and eliminate refractive index protrusions at the material level.

[0010] Furthermore, the molar percentages of vinylidene fluoride monomer, trifluoroethylene monomer, and trifluorochloroethylene monomer in the poly(vinylidene fluoride-trifluoroethylene-trifluorochloroethylene) are (60-64):(24-28):(10-14). By precisely controlling the molar percentages of vinylidene fluoride monomer, trifluoroethylene monomer, and trifluorochloroethylene monomer in the poly(vinylidene fluoride-trifluoroethylene-trifluorochloroethylene), the dielectric constant is maintained within a reasonable range, ensuring the effectiveness of the driving voltage division and guaranteeing the smoothness of the electric field distribution at the molecular scale.

[0011] Furthermore, the dielectric constant of the high-dielectric layer is 1500~2000, and the thickness is 25. μm ~35 μm By limiting the dielectric constant and thickness of the high-dielectric layer, the voltage division ratio between it and the blue phase liquid crystal layer can be precisely controlled, forcing most of the driving voltage to be distributed to the high-dielectric layer, thus smoothing the electric field gradient of the blue phase liquid crystal layer and eliminating the refractive index protrusion from the physical structure.

[0012] The present invention also provides a focusing method for a dual-electrode layer blue phase liquid crystal lens device, comprising the following steps: S1. Apply a driving voltage to the first driving electrode layer and the second driving electrode layer, wherein the driving voltage gradually decreases from the lens edge to the lens center; S2. The driving voltage is transmitted to the blue phase liquid crystal layer through the high dielectric layer, and a vertical electric field is formed in cooperation with the ground electrode layer. S3. The blue phase liquid crystal layer generates electric field-induced birefringence based on the extended Kerr effect, forming a refractive index gradient distribution; S4. By adjusting the driving voltage, the refractive index distribution of the blue phase liquid crystal layer is dynamically changed to achieve continuous change of focal length.

[0013] The focusing method of the dual-electrode layer blue phase liquid crystal lens device of the present invention applies a driving voltage that decreases gradually from the edge of the lens to the center to the misaligned dual-layer driving electrodes. After voltage division by the high dielectric layer, a continuous vertical electric field is formed, which triggers the smooth refractive index gradient generated by the extended Kerr effect in the blue phase liquid crystal layer, thereby achieving rapid dynamic focusing. This eliminates the refractive index protrusion caused by the electrode gap in the traditional multi-electrode mechanism, and improves the imaging resolution and focusing range.

[0014] Furthermore, the voltage value of the driving voltage can be expressed as:

[0015] in, V ITO The driving voltage applied to the first driving electrode or the second driving electrode. V LC This represents the voltage in the blue phase liquid crystal layer. V Dielectric The voltage in the high dielectric layer. The relative permittivity of the blue phase liquid crystal layer is... The thickness of the high dielectric layer, The relative permittivity of the high dielectric layer, The thickness of the blue phase liquid crystal layer is given. By quantifying the voltage distribution relationship between the driving voltage in the blue phase liquid crystal layer and the high dielectric layer, the electric field strength of the blue phase liquid crystal layer is precisely controlled to ensure the consistency of the refractive index and eliminate the refractive index bulge caused by voltage distribution deviation.

[0016] Furthermore, the voltage in the blue phase liquid crystal layer This can be expressed as: , in, E LC This represents the electric field intensity value of the blue phase liquid crystal layer corresponding to the location of the first or second driving electrode. By establishing a linear relationship between the voltage of the blue phase liquid crystal layer and the electric field intensity at the electrode location, a parameter basis is provided for precise control of the refractive index distribution, eliminating refractive index deviations caused by electric field calculation errors.

[0017] Furthermore, the maximum value of the driving voltage is 50~250V, and it is applied to the first or second driving electrode at the edge of the lens. By limiting the maximum value of the driving voltage and applying it to the edge electrode of the lens, it is ensured that the blue phase liquid crystal layer produces a saturated birefringence effect within a safe electric field strength range, generating a smooth refractive index distribution and eliminating the risk of distortion in high-voltage regions.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. Significantly suppresses refractive index bulges. Through the dual-layer electrode voltage divider drive design, the electric field distribution in the blue phase liquid crystal layer is optimized, effectively suppressing the local abnormal refractive index bulges caused by the electrode gap in traditional multi-electrode structures, making the refractive index distribution closer to the ideal curve. 2. Improved image quality: The optimized refractive index distribution makes the light converge more concentrated, effectively reducing optical aberrations, thereby improving the lens's imaging resolution and clarity; 3. Expanding the focusing range: Under the same driving voltage, the present invention can generate a larger effective refractive index difference, which significantly expands the focal length variation range of the lens compared with the traditional multi-electrode structure, enhancing its adaptability in variable focus applications. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a dual-electrode layer blue phase liquid crystal lens device. Figure 2 The voltage distribution diagrams on the first driving electrode and the second driving electrode are shown. Figure 3 This is a schematic diagram of the structure of the dual-electrode layer blue phase liquid crystal lens device in Embodiment 2; Figure 4 The refractive index distribution is shown when the maximum driving voltage is 50V. Figure 5 The refractive index distribution is shown when the maximum driving voltage is 100V. Figure 6 The refractive index distribution is shown when the maximum driving voltage is 150V. Figure 7 The refractive index distribution is shown when the maximum driving voltage is 200V. Figure 8 The refractive index distribution is shown when the maximum driving voltage is 250V. Figure 9 This is a dot plot comparison of the RMS radius and focal length of a dual-electrode blue phase liquid crystal lens device.

[0020] In the attached figures: 100, upper glass substrate; 200, ground electrode layer; 300, blue phase liquid crystal layer; 400, high dielectric layer; 500, first driving electrode layer; 600, second driving electrode layer; 700, lower glass substrate. Detailed Implementation

[0021] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0022] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0023] Example 1 This embodiment is a first embodiment of a dual-electrode layer blue phase liquid crystal lens device, including an upper glass substrate 100, a ground electrode layer 200, a blue phase liquid crystal layer 300, a high dielectric layer 400, a first driving electrode layer 500, a second driving electrode layer 600, and a lower glass substrate 700 arranged sequentially. The first driving electrode layer 500 includes multiple sets of horizontally arranged first driving electrodes, and the second driving electrode layer 600 includes multiple sets of horizontally arranged second driving electrodes. The gap between adjacent first driving electrodes is equal to the width of the second driving electrode, and the first driving electrodes and the second driving electrodes are staggered in the vertical direction.

[0024] In the dual-electrode blue phase liquid crystal lens device of the present invention, when no voltage is applied to the first driving electrode layer 500 and the second driving electrode layer 600, the blue phase liquid crystal layer 300 exhibits optical isotropy; when a voltage is applied to the first driving electrode layer 500 and the second driving electrode layer 600, a vertical electric field is generated in the blue phase liquid crystal layer 300. According to the extended Kerr effect model, the electric field-induced birefringence of the blue phase liquid crystal layer 300 can be obtained. The upper glass substrate 100 and the lower glass substrate 700 support and encapsulate the internal ground electrode layer 200, the blue phase liquid crystal layer 300, the high dielectric layer 400, the first driving electrode layer 500, and the second driving electrode layer 600, ensuring that each functional layer maintains a fixed relative position and stability. The driving voltage is transmitted to the blue phase liquid crystal layer 300 through the high dielectric layer 400, forming a vertical electric field with the cooperation of the ground electrode layer 200, causing the blue phase liquid crystal layer 300 to produce a smooth refractive index gradient distribution, thereby achieving light focusing. By adjusting the driving voltage, the refractive index distribution of the blue phase liquid crystal layer 300 can be dynamically changed, achieving continuous focusing. When a driving voltage is applied to the first driving electrode layer 500 and the second driving electrode layer 600, since the gap between adjacent first driving electrodes is equal to the width of the second driving electrode, and the first and second driving electrodes are offset in the vertical direction, the two electrode layers form a complementary coverage, eliminating the electric field blind zone caused by the gap between single-layer electrodes, significantly suppressing refractive index protrusion, optimizing the electric field distribution in the blue phase liquid crystal layer 300, and making the refractive index distribution closer to the ideal curve.

[0025] like Figure 1 As shown, in this embodiment, the first driving electrode layer 500 is etched in the high-dielectric layer 400, and the second driving electrode layer 600 is etched in the lower glass substrate 700. By using a separate manufacturing process, the first driving electrode layer 500 is etched inside the high-dielectric layer 400, and the second driving electrode layer 600 is independently etched on the surface of the lower glass substrate 700. While maintaining the continuity of electric field coverage in the staggered electrode structure, the complexity of the manufacturing process is reduced, achieving the same optical performance with a simpler process.

[0026] Example 2 This embodiment is the second embodiment of the dual-electrode layer blue phase liquid crystal lens device. This embodiment is similar to the first embodiment, except that, as Figure 2 As shown, in this embodiment, both the first driving electrode layer 500 and the second driving electrode layer 600 are etched within the high-dielectric layer 400. By etching both the first driving electrode layer 500 and the second driving electrode layer 600 inside the high-dielectric layer 400, the electric field coupling efficiency between the two electrodes is enhanced, allowing the driving voltage to be transferred to the blue phase liquid crystal layer 300 more efficiently, ensuring the vertical alignment accuracy of the misaligned electrode structure, and further optimizing the continuity of the electric field distribution.

[0027] Example 3 This embodiment is the third embodiment of the dual-electrode layer blue phase liquid crystal lens device. This embodiment is similar to Embodiment 1, except that the high-dielectric layer 400 is a fully polymer-infiltrated composite material, comprising 70%~80% by volume of poly(vinylidene fluoride-trifluoroethylene-trifluorochloroethylene) and 20%~30% by volume of polyaniline. By combining poly(vinylidene fluoride-trifluoroethylene-trifluorochloroethylene) with polyaniline at a specific volume fraction, a fully polymer-infiltrated structure with a high dielectric constant is formed. This allows the high-dielectric layer 400 to efficiently share the driving voltage, reduce the abrupt change in the electric field gradient of the blue phase liquid crystal layer 300, and eliminate refractive index protrusions at the material level. In this embodiment, the preferred volume fraction of poly(vinylidene fluoride-trifluoroethylene-trifluorochloroethylene) is 77%, and the preferred volume fraction of polyaniline is 23%.

[0028] The molecular percentages in poly(vinylidene fluoride-trifluoroethylene-trifluorochloroethylene) are (60~64):(24~28):(10~14). By precisely controlling the molecular percentages of vinylidene fluoride monomers, trifluoroethylene monomers, and trifluorochloroethylene monomers in poly(vinylidene fluoride-trifluoroethylene-trifluorochloroethylene), the dielectric constant is maintained within a reasonable range, ensuring the effectiveness of the driving voltage division and guaranteeing the smoothness of the electric field distribution at the molecular scale. In this embodiment, the preferred molecular percentages in poly(vinylidene fluoride-trifluoroethylene-trifluorochloroethylene) are 62:26:12.

[0029] The high dielectric layer 400 has a dielectric constant of 1500~2000 and a thickness of 25. μm ~35 μm By limiting the dielectric constant and thickness of the high-dielectric layer 400, its voltage division ratio with the blue phase liquid crystal layer 300 is precisely controlled, forcing most of the driving voltage to be distributed to the high-dielectric layer 400, thus smoothing the electric field gradient of the blue phase liquid crystal layer 300 and eliminating refractive index protrusions from a physical structural perspective. In this embodiment, the preferred thickness of the high-dielectric layer 400 is 31 μm. μm The dielectric constant is preferably 2000.

[0030] Example 4 This embodiment is the first embodiment of a focusing method for a dual-electrode layer blue phase liquid crystal lens device, including the following steps: S1. Apply a driving voltage to the first driving electrode layer 500 and the second driving electrode layer 600, and the driving voltage gradually decreases from the lens edge to the lens center; S2. The driving voltage is transmitted to the blue phase liquid crystal layer 300 through the high dielectric layer 400, and a vertical electric field is formed with the cooperation of the ground electrode layer 200. S3, the blue phase liquid crystal layer 300 generates electric field-induced birefringence based on the extended Kerr effect, forming a refractive index gradient distribution; S4. By adjusting the driving voltage, the refractive index distribution of the blue phase liquid crystal layer 300 is dynamically changed to achieve continuous change of focal length.

[0031] like Figure 3 As shown, the driving voltage applied to the first driving electrode layer 500 and the second driving electrode layer 600 gradually decreases from the lens edge to the lens center within the effective optical region of the lens. By designing the driving voltage to decrease gradually from the lens edge to the lens center, a refractive index decreasing distribution consistent with an ideal lens is formed in the blue phase liquid crystal layer 300, directly eliminating local electric field distortion caused by voltage abrupt changes and ensuring precise light convergence.

[0032] The driving voltage value can be expressed as:

[0033] in, V ITO The driving voltage applied to the first driving electrode or the second driving electrode. V LC This refers to the voltage in the blue phase liquid crystal layer 300. V Dielectric The voltage in the high dielectric layer 400 Here is the relative permittivity of the blue phase liquid crystal layer 300. The high dielectric layer has a thickness of 400. The relative permittivity of the high dielectric layer 400 is given. The thickness of the blue phase liquid crystal layer is given. By quantifying the voltage division relationship between the driving voltage in the blue phase liquid crystal layer 300 and the high dielectric layer 400, the electric field strength of the blue phase liquid crystal layer 300 is precisely controlled to ensure the consistency of the refractive index and eliminate the refractive index bulge caused by voltage distribution deviation.

[0034] Voltage in blue phase liquid crystal layer 300 This can be expressed as: , in, E LC This represents the electric field intensity value of the blue phase liquid crystal layer 300 corresponding to the location of the first or second driving electrode. By establishing a linear relationship between the voltage of the blue phase liquid crystal layer 300 and the electric field intensity at the electrode location, a parameter basis is provided for precise control of the refractive index distribution, eliminating refractive index deviation caused by electric field calculation errors.

[0035] In this embodiment, the maximum driving voltage is 50~250V, and it is applied to the first or second driving electrode at the edge of the lens. By limiting the maximum driving voltage and applying it to the edge electrode of the lens, it is ensured that the blue phase liquid crystal layer 300 produces a saturated birefringence effect within a safe electric field strength range, generating a smooth refractive index distribution and eliminating the risk of distortion in high-voltage regions.

[0036] When no voltage is applied to the lens, the blue phase liquid crystal exhibits optical isotropy, with a refractive index of 1.5%. :

[0037] in, The ordinary refractive index of blue phase liquid crystal molecules. The unusual optical refractive index of the blue phase liquid crystal molecules. When a voltage is applied to the lens, a perpendicular electric field is generated in the blue phase liquid crystal layer 300. According to the extended Kerr effect model, the electric field-induced birefringence of the blue phase liquid crystal can be obtained. :

[0038] in, The saturated birefringence of blue phase liquid crystal molecules. Let be the value of the saturation electric field. For normally incident rays, the refractive indices of both the o-ray and e-ray are the ordinary refractive indices of the blue phase liquid crystal. It can be expressed by the following formula: .

[0039] In this embodiment, the refractive index distribution of the dual-electrode blue phase liquid crystal lens device under an electric field is simulated using the finite element method. The simulation parameters are shown in Table 1.

[0040] Table 1 Simulation parameters of the dual-electrode layer blue phase liquid crystal lens device

[0041] The width of the ground electrode layer 200 is 5.1 mm. The electrode material in the first driving electrode layer 500 and the second driving electrode layer 600 is indium tin oxide (ITO). The liquid crystal material is polymer-stabilized blue phase liquid crystal. The upper glass substrate 100 and the lower glass substrate 700 are made of quartz glass, with a transmittance greater than 99.5% under natural light.

[0042] like Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8As shown, the refractive index distribution of a traditional multi-electrode blue phase liquid crystal lens and the dual-electrode blue phase liquid crystal lens device in this embodiment are compared under five highest driving voltages: 50V, 100V, 150V, 200V, and 250V. The blue line represents the ideal refractive index curve, the gray line represents the refractive index curve of the dual-electrode blue phase liquid crystal lens device in this embodiment, and the red line represents the refractive index curve of the traditional multi-electrode structure. From the magnified view, it can be seen that the refractive index distribution in this embodiment is closer to the ideal curve and is smoother, while the refractive index distribution curve of the traditional multi-electrode structure deviates more from the ideal curve. Figure 9 The diagrams compare the RMS radii of the traditional multi-electrode structure and the dual-electrode blue phase liquid crystal lens device in this embodiment, as well as the focal length under different voltages. Under the same voltage and focal length, the RMS radius of the dual-electrode blue phase liquid crystal lens device in this embodiment is smaller, indicating that the light is more concentrated, which can reduce the optical aberration of the lens and improve its imaging quality.

[0043] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0044] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A dual-electrode layer blue phase liquid crystal lens device, characterized in that, The assembly includes an upper glass substrate (100), a ground electrode layer (200), a blue phase liquid crystal layer (300), a high dielectric layer (400), a first driving electrode layer (500), a second driving electrode layer (600), and a lower glass substrate (700) arranged in sequence. The first driving electrode layer (500) includes multiple sets of horizontally arranged first driving electrodes, and the second driving electrode layer (600) includes multiple sets of horizontally arranged second driving electrodes. The gap between adjacent first driving electrodes is equal to the width of the second driving electrode, and the first driving electrode and the second driving electrode are staggered in the vertical direction.

2. The dual-electrode blue phase liquid crystal lens device according to claim 1, characterized in that, The first driving electrode layer (500) is disposed at the bottom end of the high dielectric layer (400), and the second driving electrode layer (600) is disposed at the top end of the lower glass substrate (700). The bottom end of the high dielectric layer (400) is attached to the top end of the lower glass substrate (700).

3. The dual-electrode blue phase liquid crystal lens device according to claim 1, characterized in that, The first driving electrode layer (500) and the second driving electrode layer (600) are both etched in the high dielectric layer (400), and the first driving electrode layer (500) is stacked on top of the second driving electrode layer (600) and is in close contact with it in the vertical direction.

4. The dual-electrode blue phase liquid crystal lens device according to any one of claims 1 to 3, characterized in that, The high dielectric layer (400) is a fully polymer percolation composite material, comprising 70% to 80% by volume poly(vinylidene fluoride-trifluoroethylene-trifluorochloroethylene) and 20% to 30% by volume polyaniline.

5. The dual-electrode layer blue phase liquid crystal lens device according to claim 4, characterized in that, The molar percentages of vinylidene fluoride monomer, trifluoroethylene monomer, and trifluorochloroethylene monomer in the poly(vinylidene fluoride-trifluoroethylene-trifluorochloroethylene) are (60-64):(24-28):(10-14).

6. The dual-electrode layer blue phase liquid crystal lens device according to claim 4, characterized in that, The high dielectric layer (400) has a dielectric constant of 1500~2000 and a thickness of 25. μm ~35 μm .

7. A focusing method for a dual-electrode layer blue phase liquid crystal lens device as described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Apply a driving voltage to the first driving electrode layer (500) and the second driving electrode layer (600), wherein the driving voltage gradually decreases from the lens edge to the lens center; S2. The driving voltage is transmitted to the blue phase liquid crystal layer (300) through the high dielectric layer (400), and a vertical electric field is formed in cooperation with the ground electrode layer (200). S3. The blue phase liquid crystal layer (300) generates electric field-induced birefringence based on the extended Kerr effect, forming a refractive index gradient distribution; S4. By adjusting the driving voltage, the refractive index distribution of the blue phase liquid crystal layer (300) is dynamically changed to achieve continuous change of focal length.

8. The focusing method of the dual-electrode layer blue phase liquid crystal lens device according to claim 7, characterized in that, The voltage value of the driving voltage can be expressed as: in, V ITO The driving voltage applied to the first driving electrode or the second driving electrode. V LC The voltage in the blue phase liquid crystal layer (300) is [value missing]. V Dielectric The voltage in the high dielectric layer (400) is... The relative permittivity of the blue phase liquid crystal layer (300) is given by [the relevant term]. The thickness of the high dielectric layer (400) is... The relative permittivity of the high-dielectric layer (400) is... The thickness of the blue phase liquid crystal layer (300) is given.

9. The focusing method of the dual-electrode layer blue phase liquid crystal lens device according to claim 8, characterized in that, The voltage in the blue phase liquid crystal layer (300) This can be expressed as: in, E LC The electric field strength value of the blue phase liquid crystal layer (300) corresponding to the location of the first driving electrode or the second driving electrode.

10. The focusing method of the dual-electrode layer blue phase liquid crystal lens device according to claim 8, characterized in that, The maximum value of the driving voltage is 50~250V, and it is applied to the first driving electrode or the second driving electrode at the edge of the lens.

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