Humidity sensing function for a display device

An electric apparatus comprising:

• a display having an active area and a peripheral area connected to the active area, the display comprising:
• an active device array substrate having a plurality of active devices disposed in the active area;
• a humidity sensor disposed in the peripheral area, wherein the humidity sensor is a thin film transistor having a first metal oxide semiconductor layer, the humidity sensor further having a first gate overlapping with the first metal oxide semiconductor layer, and a first source and a first drain disposed at two opposite ends of the first metal oxide semiconductor layer and connected to the first metal oxide semiconductor layer, and wherein each of the active devices has a second gate, a second metal oxide semiconductor layer overlapping with the second gate, and a second source and a second drain disposed at two opposite ends of the second metal oxide semiconductor layer and connected to the second metal oxide semiconductor layer, wherein the first gate and the second gate belong to the same film layer, the first metal oxide semiconductor layer and the second metal oxide semiconductor layer belong to the same film layer, and the first source, the first drain, the second source and the second drain all belong to a film layer;
• a passivation layer covering the active devices wherein the passivation layer at least exposes the first metal oxide semiconductor layer of the humidity sensor;
• an opposite substrate disposed opposite to the active device array substrate;
• a display medium disposed between the active device array substrate and the opposite substrate;
• and
• a process unit electrically connected to the humidity sensor and calculating a humidity value according to a sensing current from the humidity sensor.