Calculator

Details Calculator Calculator

1976-12-10

1978-05-02

Smith, Jerry

Boots, shoes, and leggings

364710, 364712, G06F 748, G06F 1502

Patent

active

040878619

ABSTRACT:
A calculator is provided having a display cell formed from a passive display material, regions of which are rendered visible by segmented electrodes. The display cell is driven by the application of selected driving signals to respective segment electrodes along display-driving lines coupled to said segment electrodes. A large-scale integrated circuit includes circuitry for producing said driving signals for application to said display-driving lines and calculator circuitry. A keyboard device is provided having an output coupled to said large-scale integrated circuit and a plurality of inputs coupled to selected of said display-driving lines, said large-scale integrated circuit including circuitry for selectively applying keyboard input signals to said selected of said display-driving lines for application to said keyboard inputs when said keyboard is utilized.

REFERENCES:
patent: 3715746 (1973-02-01), Hatano
patent: 3781852 (1973-12-01), White
patent: 3834616 (1974-09-01), Washizuka et al.
patent: 3950743 (1976-04-01), Hatano et al.
patent: 3991306 (1976-11-01), Raymond, Jr.
patent: 3999180 (1976-12-01), Hickman

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