The wide-format dual-line 1200-dpi thick-film thermal head was developed utilizing the following technologies:□ An alternated conductive lead circuitry inside the thermal head is devised. The circuitry does not use diodes for prevention of reverse current; instead, it adds a secondary power supply to redirect the reverse current.□ The 1200-dpi printhead is combined of two identical 600dpi nib lines with half-pitch offset in the nib line direction and separated by a distance of 32 nib lines in the printing direction.□ The printhead is manufactured by the direct dispensing system using the air micro technology which feeds back the pressure and controls the linear actuator to follow the surface of a substrate so that a heater nib line can be produced stably and accurately.□ Several wide-format (up to 54” width) products based on the 1200-dpi thermal print head have been designed and are capable of printing half-toned images of up to 133 lpi (line per inch).