Minimization of halo mura in homogenous alignment liquid crystal displays via a dichroic light absorber [Invited]

Local dimming technology enables high dynamic range liquid crystal displays (LCDs). However, when displaying a bright image in a dark background, so-called halo mura (halation caused by local light leakage in oblique viewing directions) appears and degrades image quality owing to reduction in contrast ratio (CR). Here light-absorbing vertically aligned dichroic dye film cells are demonstrated to enhance the CR in a homogenously aligned LC mode. The light leakage in normal and oblique viewing directions is reduced greatly in both simulated and experimental results. Positioning such a functional film above the conventional polarizer can greatly improve the CR of all LCDs while reducing surface reflection.