초록 ▼

A display employing a horizontal and vertical grid of parallel infrared light beams in front of a cathode ray tube (CRT) face wherein a finger or other object may be placed against the face of the CRT to mark a spot thereon and the spot so marked will be detected by the interrupted beams. Infrared s

A display employing a horizontal and vertical grid of parallel infrared light beams in front of a cathode ray tube (CRT) face wherein a finger or other object may be placed against the face of the CRT to mark a spot thereon and the spot so marked will be detected by the interrupted beams. Infrared sources and detectors are located around the periphery of the CRT face and operate in different planes to more closely follow the curvature of the CRT face and thereby minimize parallax errors.

대표청구항 ▼

Interactive video display apparatus functioning with a video display having a non-planar display area and with associated equipment which generates signals for a display on said display area comprising: a plurality of energy sources located along the edge of the display area of said video display an

Interactive video display apparatus functioning with a video display having a non-planar display area and with associated equipment which generates signals for a display on said display area comprising: a plurality of energy sources located along the edge of the display area of said video display and energized to send beams of energy proximate to at least a portion of said display area; a plurality of detectors located along the edge of the display area but being spaced further therefrom than said plurality of energy sources, each of said detectors receiving at least one energy beam and providing an indication upon the received energy beams being interrupted and wherein an object touching the video display interrupts more than two energy beams at least one of which is close to the surface of said display at the point touched; means responsive to the interrupted beam indication from ones of said detectors for providing identity signals indicating which energy beams are interrupted; and means for processing said identity signals to choose the interrupted energy beams closest to the surface of said display area at the point touched, the identity signals of the chosen interrupted beams defining the coordinates of the video display point being touched.