Semiconductor light source driving apparatus and a projection type display apparatus

A semiconductor light source driving apparatus comprising:

• a light source unit comprising plural light source modules which are connected in series, each light source module including a switching element which is controlled to be turned on/off by a control signal and a series circuit connected in parallel with the switching element, the series circuit including one or more series-connected light source elements;
• a DC power supply unit configured to supply a DC voltage to the light source unit;
• a current detection unit configured to detect a current flowing into the light source unit;
• a switching element driving unit configured to drive the switching element of the light source module to turn on/off the switching element;
• a memory unit;
• and
• a controller configured to control the DC power supply unit and the switching element driving unit,
• wherein the controller identifies a light source module including a light source element which has disconnection failure based on a signal from the current detection unit, and stores information indicating the identified light source module in the memory unit, and
• turns on the switching element of the light source module including the light source element which has disconnection failure based on the information stored in the memory unit in order to solve the disconnection failure.