Method of producing liquid crystal display devices with alignment layer formed from organic tin compound of the type Rn SnX4-n

Abstract

Abstract An orientation layer for liquid crystal display devices is formed from an organic tin compound of the type: Rn SnX4-n wherein R is an organic radical; X is a reactive residual radical and n is an integer ranging from 1 to 3, by applying such organic tin compound onto a free surface of a carrier plate of a liquid crystal display device and generating the desired layer. In a preferred embodiment, the organic radical is an alkyl and the reactive residual radical is chlorine. In a preferred embodiment, the orientation layer is applied via an immersion technique wherein a select organic tin compound is dissolved in a suitable organic solvent, applied to a carrier plate surface and thereafter dried at somewhat elevated temperatures. The so-obtained orientation layer is stable, strongly adherent to its substrate and gives adjacent liquid crystal molecules a specific angle of incidence, whose size depends on the selected tin compound as well as on the liquid crystal material utilized and can range between about 20 DEG and 90 DEG . Smaller angles of incidence can be obtained by rubbing the orientation layer. These orientation layers can also be made electrically conductive by doping and subsequent pyrolysis. In this manner, transparent electrodes and orientation layers for liquid crystal display devices can be produced from substantially identical starting materials and with very similar production conditions.

Inventors

• 👤 Joerg Bernhardt

Bibliographic Details