Villamos Berendezes Es Keszulek Muvek

Jozsef Szalai

Gabor Magos

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.

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Budapest, Hungary

Jozsef Szalai