Patent
Logic level shifters and their application in luminous display circuits
TLDR
In this paper, 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 the integrated circuits but within the ranges of tolerance and safety of said integrated circuits.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.read more
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References
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Patent
Luminous indicator with zero standby power
TL;DR: In this paper, a series of luminous elements are connected in series relation to form a series circuit which is supplied through a constant current device, and a solid state switching device is placed in parallel with each luminous element (e.g., LED).
Patent
Voltage level indicator established by a series of progressively energized light emitting diodes
Gunnar Wallander,Bernt Bostrom +1 more
TL;DR: In this article, a voltage level detector has a string of series coupled light emitting elements, such as light emitting diodes or low voltage lamps, as indicating devices, where the transistors are series coupled and have their base electrodes connected to the same voltage level point.
Patent
Digital waveform analyzer
TL;DR: The Digital Waveform Analyzer as discussed by the authors is a portable device that approximates the operation of a cathode ray oscilloscope in time sweep mode by selectively lighting elements of a rectangular matrix of light emitting diodes.
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