Flexible circuit board (flexible printed circuit fpc) is a highly reliable and excellent flexible printed circuit board based on polyimide or polyester film. It has the characteristics of high density, light weight, thin thickness and good bending. Flex PCB is a highly reliable and excellent flexural printing circuit made of polyester film or polyimide. By embedding circuit design on flexible thin plastic sheet, a large number of precision components are stacked in narrow and limited space to form a flexible circuit. This kind of circuit can bend at will, fold the weight light, the volume is small, the heat dissipation is good, the installation is convenient, broke through the traditional interconnection technology.