A display module is equipped with a display panel having a display screen for displaying images on a front side of the panel. The driving unit includes a head to hold the component and a driving mechanism to move the head. A blade is fitted in the helical groove and can move into and from the helical groove. By controlling the interconnect temperature to be below the temperature at which the interconnect transits from a tensile to a compressive mode, interconnect extrusions in vias are eliminated. In this embodiment, an edgefeed is disposed between the first edge and the printhead body, and is in fluid communication with an ink reservoir. An updated channel estimate is then obtained from the estimated data.