Flexoelectric effect and human eye perception on the image flickering of a liquid crystal display

We investigated the flexoelectric effect of a fringe field switching liquid crystal (LC) cell and characterised the resultant image flicker with different LC mixtures at different frame rates. Incorporating with human eye perception of 10 observers, we found that LC mixtures with a dielectric anisotropy smaller than ~7 lead to unnoticeable image flicker at 60 frames per second. The obtained flicker sensitivity line serves as important guidelines for optimising LC materials and display devices.