Semiconductor device and display apparatus

An active matrix display apparatus including a plurality of pixels arranged in a matrix, in which each pixel comprises, at least:

• an element to be driven;
• a switching thin film transistor which operates when a selection signal is applied to a gate and which captures a data signal;
• an element-driving thin film transistor in which a drain is connected with a drive power source, a source is connected with the element to be driven, and a gate receives a data signal supplied from the switching thin film transistor, for controlling electric power supplied from the drive power source to the element to be driven;
• a storage capacitor having a first electrode connected with the switching thin film transistor and with the gate of the element-driving thin film transistor and a second electrode connected between the source of the element-driving thin film transistor and the element to be driven, for holding a gate-source voltage of the element-driving thin film transistor in accordance with the data signal;
• and
• a switching element for controlling a potential of the second electrode of the storage capacitor.

A display apparatus including a plurality of electroluminescence elements arranged in a matrix, wherein

• a driving transistor is provided corresponding to each electroluminescence element for controlling a drive current to be supplied to the electroluminescence element,
• the driving transistor is an n-channel transistor and includes an LD region in which a low concentration of impurities is doped, between a channel region and each of source and drain regions in which a high concentration of impurities is doped,
• a gate of the driving transistor is connected with a switching transistor and one end of a capacitor,
• a connection point of the electroluminescence element and the driving transistor is connected to a low volage power source via a discharge transistor, and
• the connection point of the electroluminescence element and the driving transistor is also connected with the second end of the capacitor.

A display apparatus including a plurality of electroluminescence element arranged in a matrix, wherein

• a driving transistor is provided corresponding to each electroluminescence element for controlling a drive current to be supplied to the electroluminescence element,
• the driving transistor is an n-channel transistor and includes an LD region in which a low concentration of impurities are doped, between a channel region and each of source and drain regions in which a high concentration of impurities are doped,
• the LD region of the driving transistor is made larger than an LD region of an n-channel transistor at least in a perpheral circuit,
• a gate of the driving transistor is connected with a switching transistor and one end of a capacitor,
• a connection point of the electroluminescence element and the driving transistor is connected to a low voltage power source via a discharge transistor, and
• the connection point of the electroluminescence element and the driving transistor is also connected with the other end of the capacitor.