Abstract: An elevator display system employs an optical fiber 10 for transmitting power pulses and/or image display information between devices at an elevator boarding site and a control panel installed in a machine room via a modulated laser. At the boarding site the beam is deflected in an X, Y scanning mode and passed onto a half-mirror beam splitter 14. One portion exiting the mirror is directed to a viewing screen 6 to display the desired image, while another portion is converted to a power supply signal by an electrooptical transducer 15 for driving the display deflection circuits, thereby eliminating the need for electrical wiring between the control panel and the boarding site.

Abstract: A display apparatus has a light modulator with an electrooptical Pockels cell disposed in a machine room to modulate a laser beam with a modulating signal from a signal source as determined by a piece of image information to be displayed. After its passage through an optical fiber, the modulated laser beam enters an elevator car where it is focussed on a horizontal deflector by a diminishing lens and then reflected to be focussed on a vertical deflector by a collecting lens. The focussed laser beam is collected on an inner surface of an elevator door by an objective lens. Each deflector is a galvanometer mirror attached to a coil and horizontally or vertically deflecting the laser beam through an angle proportional to a saw tooth current flowing through the coil under the control of the signal source. This results in the display of the piece of image information on the inner surface of the elevator door.