The de-interlaced scan input signal is easy to produce line image sticking in TFT-LCD. This paper researched the relationship between line image sticking with the drive signal. The result shows that line image sticking can be reduced by changing the polarity inversion mode of drive signal. At the same time by adding the pre-charge and controlling the TFT current ratio of

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the flash problem brought by changing drive signal could be resolved. The research established the solution and theoretical basis for line image sticking.