Circuit arrangement for display boards having luminous...

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

H - Electricity

04

N

350/56

H04N 3/12 (2006.01) G09F 13/28 (2006.01) H03K 17/735 (2006.01) H05B 39/09 (2006.01)

Patent

CA 1085046

ABSTRACT OF THE DISCLOSURE 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 con- stant 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 con- nected to the bars that are linked to the switching elements.

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