Embodiments of the disclosure provide a touch sensing device, comprising a substrate and a sensor array arranged on the substrate, the sensor array comprising a plurality of sensor units. Each sensor unit comprises an infrared light emitting diode and an infrared sensing thin film transistor. The infrared light emitting diode is configured to emit infrared rays, and the infrared sensing thin film transistor is configured to detect infrared rays emitted from the infrared light emitting diode and reflected by a user, so as to generate a current signal capable of representing user body data. Embodiments of the disclosure further provide a mobile apparatus comprising the touch sensing device and a display device. The touch sensing device is arranged at a back side of the mobile apparatus, and the display device is arranged at a front side of the mobile apparatus and is configured to display the user body data.