Since the application of liquid crystal begun in 1960s

the related manufacturing technology has already been considerably mature

but there are still many problems to desiderate to be resolved. The charge-accumulation of TN-LCD is the one of quite intractable problems in producing of LCD. Because quantitative measurement of charge-accumulation is hard to be done

the problem is still up in the air. Here the charge accumulation of LCD was analyzed from the opinion of the dielectric physics in this paper

and it was found that the accumulated charge can be produced in the interface when the ratio of dielectric constant and conductivity for alignment layer doesnt equal to that of LCD layer. The larger the ratio of dielectric constant and conductivity

the higher charge accumulation

and if the ratio of dielectric constant and conductivity equals to each other

there is no charge to be accumulated

this will be helpful to solve the problems such as image sticking

slow response <em>etc</em>.