Illumination optical system and projector using the same

A projector in an illumination optical system, the projector comprising:

• a laser light source;
• a synchronization signal processor that converts synchronization signals that are synchronized with video signals input from outside the projector into video signals to be used inside the projector;
• an LD driver that controls a lighting state of the laser light source according to the synchronization signals output from the synchronization signal processor;
• an LED (Light Emitting Diode) light source;
• an LED driver that controls a lighting state of the LED light source according to the synchronization signals output from the synchronization signal processor;
• a rotational state detector that detects a rotational state of a phosphor wheel;
• and
• a phosphor wheel driver that, based on a detected result of the rotational state detector, controls the rotational state of the phosphor wheel such that a color of a video signal indicated by one of the synchronization signals output by the synchronization signal processor matches a color output by the illumination optical system that indicates the rotational state of the phosphor wheel detected by the rotational state detector.