The present invention relates to a transmission interface. A display device comprises a driving circuit and a transmission interface. The transmission method of the transmission interface is that a first input is used for receiving a first data string; a second input is used for receiving a second data string; and the processing unit receives the first and second data strings. The first data string has a first identification bit and a plurality of first information bits. The second data string has a plurality of second information bits. The processing unit identifies either to write a plurality of parameters or a plurality of data to a storage circuit or to read the stored content from the storage circuit according to the first identification bit and the plurality of first information bits. The processing circuit further writes or reads the storage circuit according to the plurality of second information bits.