Electrochromic devices on non-rectangular shapes

A method of determining a bus bar configuration for an optically switchable device having a non-rectangular shape, the method comprising:

• determining a centroid of the non-rectangular shape;
• determining first and second anchor points on a first side and second side of the non-rectangular shape based on the determined centroid;
• determining lengths of a first bus bar segment and a second bus bar segment extending from the first anchor point and lengths of a third bus bar segment and a fourth bus bar segment extending from the second anchor point, wherein a first bus bar comprises the first bus bar segment and the second bus bar segment, and wherein the second bus bar comprises the third bus bar segment and the fourth bus bar segment;
• determining a summed maximum bus bar distance as a distance of a weakest coloring point on the optically switchable device to the first bus bar and a distance of the weakest coloring point to the second bus bar;
• determining a summed minimum bus bar distance of a distance of a strongest coloring point on the optically switchable device to the first bus bar and a distance of the strongest coloring point to the second bus bar;
• calculating a difference between the summed maximum bus bar distance and the summed minimum bus bar distance;
• adjusting the lengths of the first bus bar segment, the second bus bar segment, the third bus bar segment, and the fourth bus bar segment until the calculated difference reaches convergent lengths for each of the first, second, third, and fourth bus bar segments;
• and
• using the convergent lengths of the first bus bar segment, the second bus bar segment, the third bus bar segment, and the fourth bus bar segment to determine a bus bar configuration for the optically switchable device.

A method of fabricating an optically switchable device on a non-rectangular substrate having at least one edge that does not form a right angle with an adjacent edge, said non-rectangular substrate having disposed thereon one or more layers of the optically switchable device, the method comprising:

• (a) receiving at a laser tool said non-rectangular substrate;
• (b) directing a laser spot from the laser tool onto the one or more layers at a region of the substrate proximate the at least one edge that does not form a right angle with an adjacent edge to thereby remove the one or more layers at the region;
• and
• (c) repeating operation (b) at different regions of the substrate proximate the edge or edges of the substrate to define a portion of the substrate where at least one of the one or more layers is removed;
• and
• wherein the laser spot is rectangular in shape and having two sides parallel to the at least one edge.