Radial dependence of local transient response of a liquid-crystal lens under voltage overdrive and frequency switching

The radial dependence of the local transient response of a liquid-crystal lens was experimentally compared under step driving, voltage overdrive, and frequency switching. Local 90% response times were determined by counting successive intensity maxima and minima at five sampling radii. The frequency-switching protocol gave the shortest times at the two inner radii, whereas voltage overdrive was most effective at the three outer radii. Maximum reductions relative to step driving were 51.6% and 65.9%, respectively. These results show that drive waveform selection should account for the spatial distribution of local transient response.