Abstract: A system for information display, such as for television, employing a panel assembly having electroluminescent properties. First and second elongated conductors are provided on opposite sides of an electroluminescent substrate, both being spaced from a ground plate conductor to define first and second transmission lines therewith. Each conductor is folded upon itself a plurality of times to define spaced, parallel, straight leg portions. Each conductor is divided into eight sections of equal length, each section in turn being divided into two parts of equal length. The adjacent ends of the two parts of each section are coupled by repeating amplifiers. A train of narrow pulses is coupled to one amplifier of the first section of each line, and a gating signal is applied simultaneously to that amplifier so that the pulses are propagated along the first section of each line to the other end where they are reflected in non-inverted form by the second amplifier.

Abstract: An elongated manually manipulable housing contains a photocell at one end for sensing energy levels in the visible frequency spectrum causing said photocell to correspondingly change in electrical conductivity. A portable power source in the housing is coupled to the photocell to provide an electrical signal corresponding to the change in the photocell conductivity. A comparator circuit in the housing compares that signal with an adjustable reference signal to provide an output signal upon a predetermined ratio between the compared signals. A multivibrator circuit in said housing is coupled to said comparator circuit and to a vibration-generating means which produces signals preferably in the audible range, so that upon the occurrence of an output signal, a user discernible, either audible or tactile, vibratory signal is generated.