The optical aperture of the liquid lens has a effect on the optical power, but until now, there is no research report on this effect .In this paper, based on Laplace function, the effect of the optical aperture on the optical parameters of the liquid lens has been analyzed, it is found that the optical aperture plays an important role on the optical power dynamic tuning range.
For the liquid lens based on electro-wetting, the optical aperture influences the profile of the liquid drop due to the capillary effect, therefore, it will has an effect on the aberration of liquid lens. The spherical aberration caused by the different optical apertures with the different slope has been investigated by ray tracing. The analysis results have shown that the absolute value of positive and negative spherical aberration at the aperture of 4mm goes down by 2μm when the optical aperture goes up from 4.2mm to 5mm and that gradient of positive spherical aberration decrease with increasing optical aperture, that gradient of negative spherical aberration increase with increasing optical aperture. The critical turning voltage when spherical aberration changes from positive to negative is independent of optical aperture.