Therma Klear Flex™ thin flexible transparent heaters from Dontech (Doylestown, PA) provide the warmth necessary to extend operating temperature of liquid crystal displays (LCDs) in cold environments (0° to below -40 °C). They also provide anti-fog, anti-icing, and de-icing functions for optics, sensors, and display assemblies.
Therma Klear Flex™ heaters are constructed with Dontech’s VCF Series™ visually transparent conductive coatings applied to flexible optical grade polyester. Custom substrates are also available. The conductive coatings are single- or multiple-layer, thin film deposited coatings with a resistance from 5 to 200 ohms/sq. When an electrical current flows through the coating, the filter will generate heat. The heaters are typically 0.007" in thickness. With dielectric enhancements, light transmission of Therma Klear Flex™ heaters can exceed 90%. Recommended power settings are from 0.1 to 1.0 watts per square inch.