Isotropic liquid crystal lens array based on resistive layer

Abstract

The invention provides an isotropic liquid crystal lens array which comprises an upper glass substrate, an upper transparent planar electrode, an isotropic liquid crystal layer, a dielectric layer, aresistive layer, a lower transparent planar electrode and a lower glass substrate. When a voltage is applied to the lower transparent planar electrode, electric field distribution with non-uniform space is generated in the isotropic liquid crystal layer through the voltage division effect of the conventional resistive layer, so that the refractive index distribution in the liquid crystal layer ischanged. Gradient refractive index distribution is generated in the isotropic liquid crystal layer through the dielectric layer, and parabolic phase distribution is obtained. The focal length of the isotropic liquid crystal lens array is adjusted by changing the voltage applied to the lower transparent planar electrode. The liquid crystal lens array is simple in driving mode and easy to manufacture.

Description

technical field [0001] The invention relates to the field of liquid crystal lenses, in particular to an isotropic liquid crystal lens array based on a resistance layer. Background technique [0002] Liquid crystal lenses have the advantages of continuous controllable focal length, low power consumption, no mechanical movement, and light structure, so they have a wide range of applications in many fields, such as self-focusing devices, 2D / 3D switchable displays, adjustable photonic devices, image processing and optical communications, etc. At present, most liquid crystal lenses use nematic liquid crystals. Since the inherent birefringence of nematic liquid crystals is relatively large, it is possible to achieve a shorter focal length adjustable. However, the nematic liquid crystal lens mainly has two defects of slow response speed and polarization dependence. [0003] In order to solve the defects of nematic liquid crystal lens, people have proposed isotropic liquid crystal...

AI Technical Summary

Problems solved by technology

Among them, the isotropic liquid crystal lens based on the square ring electrode can achieve polarization independence, but the lens radius in different directions under the square ring electrode is not equal, and the ideal focusing effect cannot be achieved; the isotropic liquid crystal lens based on the gradient electrode structure can To achieve a good parabolic phase distribution, but the distribution of the gradient electrodes is not on the same horizontal plane, an additional photolithography process needs to be introduced, which increases the difficulty of the manufacturing process; the isotropic liquid crystal lens based on the hole-type electrode matching glass lens structure can achieve a larger Focus range, and can realize the switching of positive and negative lenses, but matching the glass lens increases the thickness of the overall device; the isotropic liquid crystal lens based on the multi-electrode structure can achieve shorter focal length adjustable, but it needs to apply different to each electrode driving voltage, the driving method is more complicated

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