With the shift register method data is written to the shift register in groups of a single horizontal row (16 dots), "1" indicates lighting and "0" non-lighting en into the shift register. Each row is written consecutively up to the 16th row, resulting in an entire screen. This method is repeated continuously. In the memory method, in contrast to the shift register method, data is written into internal memory. When all 16 rows have been completed the content is automatically displayed.