A sequential transmission circuit device used for a liquid crystal display device is applied to reduce transient current and comprises a receiving end used to receive a serial datum; a coded conversion unit sequence, which is coupled to the receiving end, includes a plurality of coded conversion units connected in series as a sequence and is used to convert the serial datum according to a plurality of dissimilar coding principles so as to generate a plurality of coded conversion results; and a plurality of output ends that are respectively coupled to each coded conversion unit in the coded conversion unit sequence and used for outputting a plurality of coded conversion results.