Poly(amic acid ester) and poly(amic ester) of polyimide precursors weir prepared from the corresponding poly(amic acid) with contolling esterification(. ratio of the pendent carboxylic group. There three different precurrsors were examined for the generation of pretill angle after curing at. various temperatures. All three alignment layers generated maximum, tilt. angle when they were, cured at the temperature approximately 20degreesC below the maximum imidization temperature. The results indicated that the proper stiffness of main Chain and residual functional group in the alignment layer were important for the generation of high. pretill. angle.