Display control for electronic calculator

Details Display control for electronic calculator Display control for electronic calculator

1982-06-18

1985-11-05

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340365S, 340762, 340814, G09G 300

Patent

active

045517169

ABSTRACT:
An electronic calculator includes a display section having segment LCDs, a key-in section having a plurality of key switches arranged in a matrix, and a one chip integrated calculation control unit connected to the display section and the key-in section for performing a calculation and a display in accordance with a key input signal. In the calculation control unit of the calculator, a common terminal is used for both a key output signal for detecting the key input signal and a segment signal for driving the display section. The common terminal is so set as to have a high impedance when the key switch is still closed after the end of one time processing of the key input signal.

REFERENCES:
patent: 3925690 (1975-12-01), Spence
patent: 3990070 (1976-11-01), Spence
patent: 4048632 (1977-09-01), Spence

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