Title: Scanning system and method using coincidence of variable frequency pulses

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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. The repetition rate of the narrow pulses applied to each line is increased during the gating signal interval from f to 2f, f being such that a reflected pulse and the next successive applied pulse coincide at the one end of the line section, the coincidence points thus moving from the one line end to the midpoint of each line section. The next successive gating signal is then applied to the second amplifier of the first line section and the pulse train simultaneously applied thereto so that the pulses are propagated and reflected in the opposite direction, the reptition rates now being varied from 2f to f during the second gating signal interval so that the coincidence points move from the midpoint of the line section to the other end. The gating signals and narrow pulses are then applied in sequence to the remaining sections of each line. The gain of the repeater amplifiers of each section of each line is varied in accordance with a video signal. Application of the narrow pulses to each line is terminated at predetermined intervals to allow for retrace times.


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