Recording head driving device

Disclosed herein is a recording head driving device for a thermal printer comprising heating elements (7) energizable over a time interval, for driving a number of recording heads such as thermal heads (6, 7) or the like for printing characters on recording media. A control signal for controlling the time required to energize each of the recording heads (6, 7) is input to recording head driving gate circuits (5) from NAND gates (5) in accordance with the present and/or past recorded information output from a latch circuit (8). A plurality of collating circuits (10) is provided each of which allows each of the latch circuits (8) to retain or hold recorded information on at least past three lines as the previous recorded information and feeds back the past latch outputs (Q6, Q7, Q8) of the latch circuit (8) to any one (Q3) of the outputs of the latch circuit (8).