The invention relates to a coating which has been applied to a substrate, comprising at least a first film and a second film which have been applied on top of each other and each comprise a transparent conducting oxide and an electron donor, wherein the second film comprises relatively at least 10 percent less electron donor than the first film. The active electronic tag includes an antenna, a first amplifier, an automatic gain control circuit, a phase synchronization locking circuit, a control unit, a tag unit and a second amplifier. The FIFO module is configured to receive streaming data, output the streaming data to the memory of the processor, and selectively generate a control signal. The floating gate is disposed on the substrate and crosses over the active area. Thus, by delaying image rendering, the image quality degradation can be prevented, therefore stable high-quality images can be displayed. The feedback loop monitors a regulated voltage of the output node and generates a control signal to regulate resistances of the first, fourth switches.