Method and apparatus for driving electrochromic display device

Details Method and apparatus for driving electrochromic display device Method and apparatus for driving electrochromic display device

1976-07-01

1977-12-06

Schaefer, Robert K.

58 50R, G04C 300

Patent

active

040609740

ABSTRACT:
A method and apparatus for driving an electrochromic display device in which an electric current is applied only to one of display elements for which non-coincidence exists between an initially applied display information signal and a subsequently applied display information signal. In one preferred embodiment, a driver circuit comprises a latch circuit for storing a display information signal, a non-coincidence detection circuit for detecting non-coincidence between a subsequently applied display information signal and an initially applied display information signal stored in the latch circuit, and a signal generating circuit responsive to a non-coincidence signal from the detection circuit for generating an output signal for a display element for which non-coincidence is detected. In another preferred embodiment, a driver circuit comprises a latch circuit for generating an output at the instant delayed from a display information signal, and gate means for generating an output signal in response to the display information signal and the output from the latch circuit.

REFERENCES:
patent: 3807832 (1974-04-01), Castellion
patent: 3828548 (1974-08-01), Martin
patent: 3839857 (1974-10-01), Berets et al.
patent: 3950936 (1976-04-01), Oguey et al.
patent: 3979899 (1976-09-01), Toshida et al.
patent: 3987433 (1976-10-01), Kennedy

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