Circuit for actuating a display with an improved comparator

Details Circuit for actuating a display with an improved comparator Circuit for actuating a display with an improved comparator

1977-02-14

1979-04-10

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

307361, 328148, 324 96, 340172, 340803, G01D 700

Patent

active

041491491

ABSTRACT:
In a display circuit for actuating a display having plural liquid crystal segments or luminescent diodes, an improved comparator is provided for determining the number of the display segments to be energized and activated in accordance with an analogue input voltage. The analogue input voltage is applied to one terminal of a resistance having plural resistors connected in series, the other terminal of which is grounded. The comparator is composed of an integrated circuit of MOS type which has plural logical circuits. Each of one input terminals of the logical circuits is connected to a corresponding one of junctions of the resistors connected in series. Each logical circuit of the comparator provides "1" output signal when the voltage at the corresponding junction exceeds a threshold value thereof. An actuator, which is constructed with exclusive OR gates or transistors, energizes the liquid crystal segments or the luminescent diodes in response to the "1" output signals from the comparator.

REFERENCES:
patent: 3021063 (1962-02-01), Kummer
patent: 3987392 (1976-10-01), Kugelmann et al.
patent: 4006412 (1977-02-01), Campbell et al.
patent: 4028620 (1977-06-01), Kitagawa et al.
patent: 4037153 (1977-07-01), Kalanit
patent: 4039859 (1977-08-01), Horninger

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