The key to thermal printing technology is the heating element. The thermal printer core has a row of tiny semiconductor components. These components are densely packed, ranging from 200 dpi to 600 dpi. These components will quickly generate high temperatures when passing a certain current. When the thermal paper is coated with these components, the temperature rises in a very short period of time, and the coating on the thermal paper undergoes a chemical reaction to produce a color.
After receiving the print data, the thermal printer converts the print data into bitmap data, and then controls the heating element on the printer core to pass the current according to the point of the bitmap data, thus changing the print data into the printed content on the printing paper.