In an embodiment, a display module comprises a temperature sensor configured to provide temperature information; a transmission interface, coupled to an external chip of the IC card; a processing module, coupled to the temperature sensor and the transmission interface, comprising: a storage device comprising an application software program; and a processing unit, coupled to the storage device, configured to be capable of executing the application software program to access data from the external chip via the transmission interface, obtaining the temperature information from the temperature sensor, and outputting a control signal according to the temperature information and data; a display driver, coupled to the processing module, configured to be capable of receiving the control signal and generating a driving signal according to the control signal; and a display film capable of displaying images, coupled to the display driver, and configured to be capable of displaying information according to the driving signal.