Electronic circuit and method for dynamic piloting of light sources in variable message information panels

A method to implement dynamic command of light sources in variable message information panels, the method including the steps of:

• arranging several elementary circuits, each of said several elementary circuits being consecutively connected in series to each other, each of said several elementary circuits having a configuration that is the same as a configuration of another one of said several elementary circuits, each one of said several arrangement elementary circuits having only one LED and three switching elements, said LED being connected electrically, through one or more of said three switching elements, to a feed voltage of a given value, to a short-circuiting line of diode, to a contiguous elementary circuit and to a circuit control output, one of said switching elements being arranged on said short-circuiting line of said diode, each of said elementary circuits being directly connected to a voltage source;
• controlling said three switching elements of each of said several elementary circuits with said circuit control such that several elementary circuits are selectively configured as single closed circuits, each of said single closed circuits including a chain of LEDs activated in dynamically variable numbers by applying a feed voltage to a feed branch of a first active LED of the chain of activated LEDs and closing an output of the control circuit on a last active LED of the chain of activated LEDs, wherein a number of activated LEDs varies based on the feed voltage;
• and
• bypassing disabled LEDs through a controlled closure of one or more of the one of said switching elements arranged on the short-circuiting line of said diode.

An electronic circuit for a dynamic control of lighting sources, such as LEDs, semi-pixels, pixels and clusters, in variable message information panels, the circuit comprising:

• a current feed;
• a control circuit comprising an output;
• a plurality of elementary circuits, each of said plurality of elementary circuits being directly connected to a voltage source and each of said plurality of elementary circuits having a first switching element, a second switching element and a third switching element, only one LED and a short-circuiting line of said LED, each of said plurality of elementary circuits being consecutively connected in series to another one of said plurality of elementary circuits of a same configuration via one or more of said first switching element, said second switching element and said third switching element, said LED and said short-circuiting line of said LED, at least one of said first switching element, said second switching element and said third switching element being arranged on said short-circuiting line of said LED, said LED being electrically connected to said current feed, said short-circuiting line of the LED, an adjacent one of said plurality of elementary circuits and said output of said control circuit via said first switching element, said second switching element and said third switching element, said control circuit closing one or more of said first switching element, said second switching element and said third switching element such that one or more of said elementary circuits define at least one closed circuit, said at least one closed circuit having a chain of activated LEDs, wherein a feed voltage is applied to a feed branch of a first active LED of the chain of activated LEDs and an output of said control circuit output is closed on a last active LED of the chain of activated LEDs, said control circuit closing at least one of said switching elements on said short-circuiting line of one or more LEDs such that said one or more LEDs is bypassed via said short-circuiting line to define at least one disabled LED.