Logic level shifters and their application in luminous display circuits
OwnerAlexandre Paphitisinventor
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Abstract
Logic level shifting circuits are described in which integrated circuits process binary logic input signals of logic levels different from the input logic levels of said integrated circuits but within the ranges of tolerance and safety of said integrated circuits. Such logic level shifting techniques are used as a simple but effective method to cut down power consumption in luminous displays using seven-segment LED's or the like which may be placed in series as a result of logic level shifting between the respective counters and decoders which control them.
Claims5
A multi-stage luminous display circuit, each stage comprising a driver having binary outputs, a decoder connected to said driver outputs and having a plurality of outputs, and a luminous display device having the same said plurality of electrodes of a first relative polarity and at least one electrode of a second relative polarity, said plurality of electrodes being connected to said decoder outputs and said at least one electrode being connected to the power input terminal of the decoder of an adjacent stage so that said display devices are effectively connected in series through said decoders, the power supply potentials of each said driver being so related to the power supply potentials of its associated same stage decoder that the logic one and logic zero signals produced on said driver outputs lie within the ranges of safety and tolerance of said same stage decoder to be recognized as logic ones and zeros.
Dependencies are inferred from the claim text.