A projector is a type of image display apparatus that projects and displays an image, which is formed on a display device. A projector generally include a light source and an optical system projecting and enlarging an image onto a screen, and is divided into several types, a CRT (cathode ray tube) projectors, transmissive and reflective liquid crystal projectors utilizing LCD (liquid crystal display) devices, and DLP (digital light processing) projectors utilizing DMD (digital micromirror device) devices. The CRT-type projector comprises a CRT assembly projecting an image beam, a mirror reflecting the projected beam, and a screen on which the reflected beam is displayed as a picture. The LCD projector (hereinafter referred to as an “LCD projector”) comprises a liquid crystal panel, a light source lamp for backlight arranged on a rear surface of the liquid crystal panel, a signal processing circuit, and a power supply circuit are provided in a casing of a liquid crystal projector. Presentations using multimedia projection systems have become popular for conducting sales demonstrations, business meetings, and classroom instruction....
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