Display temperature compensator for electric meter

Details Display temperature compensator for electric meter Display temperature compensator for electric meter

1984-04-12

1986-11-25

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Demand, excess, maximum or minimum

323369, 350331T, G01R 1164, H03H 304, G02F 113

Patent

active

046251634

ABSTRACT:
A display temperature compensator employs the non linear temperature coefficient of resistance of a thermistor to non linearly vary the control voltages fed to a liquid crystal display. At low temperature, substantially the entire supply voltage is available to control the liquid crystal display segments. At higher temperatures, the thermistor contracts the range of control voltages fed to the display in order that non-selected display segments remain off. A thermistor is used which has a non linear temperature coefficient of resistance which, when combined with selected fixed resistance value, substantially compensates for the non linear threshold voltage of the liquid display.

REFERENCES:
patent: 3686517 (1972-08-01), Sexton, Jr.
patent: 3921162 (1975-11-01), Fukai et al.
patent: 3956661 (1976-05-01), Sakamoto et al.

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