Electronic timepiece with an electrochromic display

Details Electronic timepiece with an electrochromic display Electronic timepiece with an electrochromic display

1976-10-18

1979-04-03

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

307200B, 340811, 350357, 58 23BA, G09F 932

Patent

active

041480155

ABSTRACT:
A driver circuit for an electrochromic display device for an electronic timepiece. In a first preferred embodiment, drive signals are applied through a plurality of source follower first and second metal oxide semiconductor field effect transistors to segment electrodes of the electrochromic display device. The first and second transistors have source electrodes connected together and also connected to the segment electrode to lower the voltage being applied across the segment electrode and a common electrode to drive the display device at a lower voltage. In a second preferred embodiment, the common electrode of the display device is alternately coupled to the high and low potentials of the battery by means of an inverter circuit composed of source follower transistors, which function to reduce the voltage being applied across the segment electrodes and the common electrode.

REFERENCES:
patent: 3096271 (1963-07-01), Hespenheide
patent: 3407339 (1968-10-01), Booher
patent: 3652149 (1972-03-01), Rogers
patent: 3938131 (1976-02-01), Van Doorn et al.
patent: 3950077 (1976-04-01), Jasinski
patent: 3987433 (1976-10-01), Kennedy
patent: 3999205 (1976-12-01), Stewart
patent: 4034550 (1977-07-01), Kouchi et al.
patent: 4057739 (1977-11-01), Otake
patent: 4061928 (1977-12-01), Kessler

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