Image sticking is one of the most important factors to evaluate the display quality of liquid crystal display(LCD)

and most of the engineers studied the material composition and the LCD manufacturing process to improve the image sticking

but the previous research mostly based on the positive liquid crystal material. In this paper

the image sticking is mainly focused on the negative liquid crystal(LC) material which is driven by fringe electric field. First

the ion density and VHR are measured to compare the stability of the two kinds of LC material

and then the residual DC voltage and the

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voltage shift of the sample are measured to compare the characteristics of the negative LC with two PI materials so as to select the right combination. The experimental results show that the ion density of the negative LC is 39 times as much as the positive LC before UV curing. After UV curing

its ion density is 560 Pc/cm and its VHR variation is 2.7%; the residual DC voltage and the

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voltage shift with time of sample A-1 are the largest which use negative LC with PI1. Its residual DC voltage is 0.5 V and the

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voltage shift is 250 mV

and the residual DC voltage of samples which use negative LC with PI2 and positive LC are less than 0.2 V

of which the

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variation with time are within 50 mV. The ion density of negative LC material is high

and its stability is worse than positive LC material

image sticking appears in the negative LC material more likely. For the FFS driving mode LCD panel which using negative liquid crystal materials

it is beneficial to use the PI2 material to maintain a low residual DC voltage and low

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voltage variation

which are helpful to improve the image sticking.