Photoelectric input apparatus for display system

A photoelectric touch input apparatus comprises a frame placed in front of the display surface of a display device, a plurality of light-emitting elements mounted on the frame in a row along one side of a central opening of the frame to produce a plurality of light beams in parallel spaced relationship, a plurality of photosensitive elements mounted on the frame in a row along the opposite side of the opening and aligned with the light-emitting elements to receive the light beams, a transparent flat plate arranged between the display surface and the light beams and resiliently supported on the frame to be moved toward the display surface by pressure of an object touched thereto, a comparison circuit associated with the photosensitive elements to produce a first output signal indicative of the position of the object when it interrupts one of the light beams, a plurality of switches mounted on the frame and associated with the flat plate to produce a plurality of second output signals therefrom in response to movement of the flat plate toward the display surface, and a switching circuit responsive to the first output signal and at least one of the second output signals to produce a control signal for switching over an indication or picture on the display surface to another indication or picture defined by the first output signal.