{HEAD ~ A display unit} is constituted by {TAIL ~ a passive matrix} of independently controllable pixels characterized by an active area of n rows and m columns of discrete pixels and a pixel border 
{ HEAD ~ A display unit } is constituted by { TAIL ~ a passive matrix } of independently controllable pixels characterized by an active area of n rows and m columns of discrete pixels and a pixel border
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH