Low-power electro-thermal film devices and methods for making the same

A low-power transparent electro-thermal film device, comprising:

• a transparent substrate;
• a transparent conductor layer disposed on a surface of the transparent substrate;
• and
• inner electrodes disposed on the transparent conductor layer and including first inner electrodes extending from a first electrode bus bar and second inner electrodes extending from a second electrode bus bar, the first inner electrodes inter-locking with the second inner electrodes, wherein each of the first inner electrodes and the second inner electrodes disposed in an interior of the device comprises a pair of spaced-apart sub inner electrodes disposed in parallel with each other, and each of the first inner electrodes disposed in an edge of the device comprises a single sub inner electrode, wherein the transparent conductor layer is continuous between the pair of spaced-apart sub inner electrodes and between the first electrode bus bar and the second electrode bus bar.