Eliminating light depolarization from metal microstructure in liquid crystal displays

A structure of copper/molybdenum/titanium conductive layer with a very long tail of titanium under copper is introduced to eliminate the depolarization problem from metal microstructures for the first time. The electric field of light is blocked by the 20‐nm thin titanium tail (200 nm) layer, and the depolarization of light at the corner of the conductive line disappears in the liquid crystal display (LCD). As a result, the contrast ratio of the LCD is increased by 18%. Transmitted light inside LCDs suffers from depolarization because of scattering at the sides of metal lines when the light polarization direction is neither vertical nor parallel to the sidewalls of the metal lines. Metal electrodes of LCDs bring additive disturbance of light polarization state, leading to the decrease of the contrast ratio.