Short-focal-distance double-layer liquid crystal lens array

Abstract

The invention discloses a short-focal-distance double-layer liquid crystal lens array. The array comprises an upper glass substrate, an upper transparent planar electrode layer, an upper top orientation layer, an upper liquid crystal layer, an upper transparent low-dielectric layer, an upper transparent right-angle triangular prism high-dielectric layer, an upper transparent strip electrode layer,an upper bottom orientation layer, a middle glass substrate, a lower top orientation layer, a lower transparent strip electrode layer, a lower transparent right-angle triangular prism high-dielectriclayer, a lower transparent low-dielectric layer, a lower liquid crystal layer, a lower bottom orientation layer, a lower transparent planar electrode layer and a lower glass substrate. Spatial non-uniform electric fields are generated among upper transparent strip electrodes and among lower transparent strip electrodes respectively, so that gradient refractive index distribution is generated in the liquid crystal layers. Since the upper transparent right-angle triangular prism high-dielectric layer and the upper transparent low-dielectric layer are arranged alternately and the lower transparent right-angle triangular prism high-dielectric layer and the lower transparent low-dielectric layer are arranged alternately, the working voltage of liquid crystal lenses is effectively lowered. Dueto double-layer design, the phase difference between the center and the edge of each liquid crystal layer is doubled, and accordingly the focal distance of the liquid crystal lenses is shortened.

Description

technical field [0001] The invention relates to the field of liquid crystal lenses, in particular to a short-focus double-layer liquid crystal lens array. Background technique [0002] Compared with traditional solid lenses, liquid crystal lenses are thin, compact, and can achieve adjustable focus without mechanical movement, so they have attracted much attention in the field of two-dimensional / three-dimensional (2D / 3D) switchable display applications. A variety of methods have been proposed to manufacture liquid crystal lenses, the most mainstream of which is to use an electric field to reorient the nematic liquid crystal molecules to generate a gradient refractive index distribution in the liquid crystal layer. Since the nematic liquid crystal molecules have a large birefringence, the optical path can be controlled in a wide range by applying a voltage, thereby realizing the function of adjustable focal length. However, the optical power of the liquid crystal lens is inve...

AI Technical Summary

Problems solved by technology

However, the combination of the solid lens and the liquid crystal layer increases the volume of the liquid crystal lens and increases the difficulty of manufacture; the concentric ring electrode structure needs to design multiple driving voltages, which is complicated to drive; the hole patterned electrode structure needs to add a thick dielectric layer to The entire aperture obtains an uneven electric field distribution, which not only increases the driving voltage of the liquid crystal lens, but also reduces the optical power of the liquid crystal lens

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