Patent ID: 8228318

Claim:
A data driving circuit for a hold-type display comprising: a video data input terminal for receiving video data; a driving voltage output terminal for outputting a driving voltage to the hold-type display; a sample and hold unit, coupled to the driving voltage output terminal, for sampling and holding voltages of the driving voltage output terminal to generate a sampled voltage according to a sampling signal; and a driving voltage generation unit, coupled to the video data input terminal, the driving voltage output terminal and the sample and hold unit, for performing a signal processing operation on the video data according to a plurality of reference voltages, a polarity selection signal and the sampled voltage to output the driving voltage; wherein the driving voltage generation unit converts a polarity of the sampled voltage corresponding to a previous frame according to the polarity selection signal corresponding to the video data of a current frame before performing the signal processing operation on the video data according to the sampled voltage.