Display unit of speedometer for automobile

Details Display unit of speedometer for automobile Display unit of speedometer for automobile

1983-04-13

1987-03-03

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

340 52F, 34081501, B60Q 100, G08B 500

Patent

active

046479015

ABSTRACT:
A display unit of a speedometer meter for an automobile, wherein a desired car speed is determined and an actual car speed is measured and signals corresponding thereto are applied to a comparing circuit and bar graph decoders. The comparing circuit compares the amplitude of the signals corresponding to desired car speed and actual car speed, and the bar graph decoders, after decoding the signals into a format compatible with a bar graph display, transmits the signals to an EX-OR circuit and an OR circuit. A selector circuit controlled by the output of a comparing circuit selects either the output of the EX-OR circuit or that of the OR circuit for driving plural segments of a bar graph display which accordingly displays both desired car speed and actual car speed either by driving selected display signals corresponding thereto or by driving display segments corresponding to a maximum value thereof and by inhibiting the driving of at least one display segment common to both desired car speed and actual car speed.

REFERENCES:
patent: 4223297 (1980-09-01), Nomura et al.
patent: 4251769 (1981-02-01), Ewert et al.

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