Apparatus to maintain a continuously graded transmission state

An apparatus comprising:

• a substrate comprising at least four sides;
• an active stack on the substrate, the active stack comprising:
• a first transparent conductive layer;
• and
• a second transparent conductive layer;
• a first bus bar set comprising a plurality of bus bars, wherein each bus bar of the first bus bar set is electrically coupled to the first transparent conductive layer;
• a second bus bar set comprising a plurality of bus bars, wherein each bus bar of the second bus bar set is electrically coupled to the second transparent conductive layer, and
• a bus bar arrangement wherein the bus bar arrangement comprises a first bus bar from the first bus bar set wrapping around a first corner, a second bus bar from the first bus bar set wrapping around a second corner, a bus bar from the second bus bar set between the first bus bar of the first bus bar set and the second bus bar of the first bus bar set, wherein a bus bar from the first bus bar set and the second bus bar set disposed along at least two sides of the substrate, wherein the bus bar arrangement alternates between a bus bar from the first bus bar set and a bus bar from the second bus bar set along the periphery of the substrate, and wherein only a bus bar from the second bus bar set is on at least one side of the substrate.