Abstract
In this study, we mainly investigated the effect of the dimensions of a coplanar inner floating ring (CIFR) on the lens performance in CIFR–hole-patterned electrode liquid crystal lenses (HPELCLs) at 100 Hz of the electrical driving frequency. The operation and threshold voltages in CIFR–HPELCLs are approximately 76% compared with those of the conventional HPELCL. The diameter of the CIFR with 360 μm in relation to imaging capabilities and those of the conventional glass lens and HPELCL were analyzed via the modulation transfer function. The relative mechanisms of the CIFR dimensions and the lens performance were also examined. An electric circuit model was used to analyze and illustrate the experimental results.
Highlights
Liquid crystals (LCs) have been studied to fabricate various electro-optical devices because of their unique physical properties, such as birefringence, response time and dielectric anisotropy [1,2,3,4,5,6]
The proposed coplanar inner floating ring (CIFR)–Hole-patterned electrode LC lenses (HPELCLs) with suitable CIFR electrode dimensions achieved a lens performance with large-phase retardation penetrating the central area of the lenses and low operation voltages at the electric frequency of 100 Hz
The fringe field intensity of the CIFR electrode was mainly affected by the capacitance (CGlass) between the CIFR and hole-patterned electrodes
Summary
Liquid crystals (LCs) have been studied to fabricate various electro-optical devices because of their unique physical properties, such as birefringence, response time and dielectric anisotropy [1,2,3,4,5,6]. In our previous work [38], the coplanar inner floating ring (CIFR)–HPELCL demonstrated a better lens performance, such as lower threshold and operation voltages at 100 Hz electric frequency, than the conventional HPELCL. This design requires only a single channel to apply an operation voltage, and the fringe field generated by the CIFR electrode can greatly reduce the operating voltage of the LC lens at low operating frequencies. The change in Cglass capacitance significantly affects the operation voltage and threshold voltage of CIFR–HPELCL, given that the fringe field intensity generated by the CIFR electrode and the cross voltage of the electric field applied to the LC layer is affected. Modulation transfer functions (MTFs) were used to examine and compare the image resolutions of the HPELCL, the CIFR–HPELCL and the conventional glass lens
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