Seven-segment display arrangement and liquid fuel dispensing pump embodying the same
AssigneeDresser Europe S.A.
InventorDonald George Buchanan
Life of this patent
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Abstract
A seven-segment display arrangement has one or more seven-segment display devices each with a common anode and a cathode for each segment, and a diode connected to each cathode is arranged so that on failure of a segment the cathode current is drawn by the diode and is used to initiate a warning signal. Principal application for the display is in a liquid fuel dispenser where the display may be mounted in encapsulated form on the dispensing nozzle.
Claims10
A seven-segment display arrangement comprising a seven-segment display device having a common anode and a cathode for each segment, a cathode driver connected to each cathode for supplying cathode current to the appropriate segment when energised, a circuit connection including a series diode connected to each cathode, a detector circuit connected to the circuit connections so as to draw current through the respective diode from the respective cathode driver in the event of a segment failure of the device, and an output from the detector circuit connected to give a warning indication on receipt of current through a diode.
A seven-segment display arrangement for displaying sales information in a liquid fuel dispensing pump, the pump having a dispensing nozzle with a handle and the display arrangement comprising an array of seven-segment electronic display devices, there being one device for each digit of information to be displayed, the array being mounted on the handle of the fuel pump nozzle.
A seven-segment display arrangement comprising a plurality of seven-segment display devices each having a common anode and a plurality of cathodes, an anode driver for each display device, a set of common cathode drivers each connected to respective cathodes of the display devices and time division multiplex means are provided to energise the anode drivers in cyclic sequence and also to alter the pattern of potentials applied by the common cathode drivers sequentially in synchronism with the cycling of the anode drivers so that as each set of common anodes of a device is energised, the cathodes of that device are energised to give the appropriate digital display.
Dependencies are inferred from the claim text.