Patent ID: 7663491

Claim:
A substrate damage detection mechanism using RFID tags, comprising: a substrate made of glass material; at least one RFID tag with a RFID chip, a RFID transmitter and at least one data input/output port; and a defogging circuit arranged to cover the substrate and provided with a first end that is electrically connected to a ground potential and a second end that is electrically connected to the data input/output port of the RFID tag and a potential with a predetermined direct current; wherein the RFID chip generates a conductive code when the defogging circuit is originally conducting and generates an open-circuit code when the defogging circuit becomes open circuit resulting from the damage of the substrate in which both the conductive code and the open-circuit code are transmitted by the RFID transmitter and received by a RFID reader to determine the damage of the substrate.