Semiconductor device

A semiconductor device having a display region including a plurality of pixels, comprising:

• a substrate;
• a first thin film transistor of a first conductivity type formed on the substrate for each pixel;
• and
• a plurality of photosensor sections formed in the display region on the substrate for detecting light and generating sensing signals, wherein,
• each of the plurality of photosensor sections includes
• a photodetecting portion including at least one thin film diode,
• a capacitor for storing a photocurrent occurring in the at least one thin film diode, and
• a second thin film transistor of the first conductivity type disposed between the photodetecting portion and the capacitor, the photodetecting portion being connected to the capacitor via the second thin film transistor;
• the first and second thin film transistors and the at least one thin film diode have semiconductor layers made of a same semiconductor film;
• the semiconductor layers of the first and second thin film transistors each include source and drain regions and a channel region located between the regions;
• and
• a characteristic of the first thin film transistor and a characteristic of the second thin film transistor are different.