Circuit arrangement for display boards having luminous elements

Details Circuit arrangement for display boards having luminous elements Circuit arrangement for display boards having luminous elements

1977-06-01

1979-01-09

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

340793, 340166R, 340780, H04N 312, H05B 3909

Patent

active

041341325

ABSTRACT:
Circuit arrangement for the shaded (gray-scale) displaying of images on display boards having individual luminous elements arranged in a matrix, wherein switching circuits of the luminous elements are connected to row and column bars, and each bar is coupled to a selecting circuit either directly or through a store element. Each switching circuit includes an analog memory, a comparator with a constant threshold level, and a power switch. The memory is preferably a capacitor which is connected -- over a switching element -- between the respective row bar and column bar. A function generator supplying a monotonously varying periodic signal is connected to the bars that are directly connected to the capacitors whereas a video-signal transmitter is connected to the bars that are linked to the switching elements.

REFERENCES:
patent: 3163851 (1964-12-01), Haan et al.
patent: 3609747 (1971-09-01), Ngo

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