It has been calculated that, the different bias ratio in the same duty has different V th which requires different abruptness in LCD operation, As a result, the optimum operating voltage ( V op ) of the STN LCD is different.

• 理论计算得出 ,相同占空比不同偏压比 Voff不同且对陡度要求不同 ,使得 STN- LCD工作范围不同 ,VOP偏离。