INPUT METHOD AND INPUT APPARATUS FOR PREJECTION DISPLAY, PROJECTION DISPLAY SYSTEM HAVING SAME APPARATUS

摘要

An input apparatus (4) for projection display includes a beam indicating device (45), a projector (43), a camera (41), a screen (42), and a signal processing device (40). The beam indicating device (45) includes a state selecting member (453) for selecting the emission state of the beam. The emission state of the beam is controlled by a beam energy attenuation circuit (457) and a beam sequence modulating circuit (457').