Investigation on newly designed low resistivity polyimide type alignment layer for reducing DC image sticking of in plane switching liquid crystal display
ABSTRACT Soluble polyimide type alignment layer is widely used in in plane switching (IPS) liquid crystal display (LCD) because of its excellent reliability owing to high imidisation ratio during long term driving, high voltage holding ratio and low ion density. Nevertheless, it exhibits slow direct current (DC) discharging property due to its high resistivity, causing significant DC image sticking problem. In this study, we doped inorganic salt to control the resistivity of soluble polyimide type alignment layer and found that this approach reduced DC image sticking greatly without any loss of reliability property in IPS LCD. Graphical Abstract