Flicker detecting system for detecting lamp life differing from lamp to lamp

A projector apparatus comprising:

• an AC component extracting circuit that extracts an AC signal from a voltage applied to a lamp, said AC signal being an AC component of said voltage applied to said lamp,
• an auxiliary detection circuit that coverts a luminescence intensity of said lamp to a voltage value and adds an AC auxiliary signal to said AC signal, the AC auxiliary signal being a signal representative of an AC component of said value of voltage,
• a display section adapted for displaying information that flicker has occurred in said lamp, and
• a control section that has a reference voltage registered in advance for determining an occurrence of flicker and instructs said display section to display the information that flicker has occurred in said lamp, depending on a result of comparison between said reference voltage and said AC signal received from said AC component extracting circuit.

A method of detecting flicker through a use of a flicker detection system having a display section, comprising:

• registering a reference voltage for determining on flicker,
• extracting an AC signal that is a signal representing an AC component of a voltage applied to a lamp,
• converting a luminescence intensity of said lamp to a voltage value and adding an AC auxiliary signal to said AC signal, said AC auxiliary signal representative of an AC component of said value of voltage, and
• instructing said display section to display an information that flicker has occurred in said lamp, depending on a result of comparison of said AC signal with said reference voltage.