Contrast controllable electrochromic display driver circuit

Details Contrast controllable electrochromic display driver circuit Contrast controllable electrochromic display driver circuit

1981-04-24

1982-12-14

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

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

340812, 350357, G09G 316

Patent

active

043640419

ABSTRACT:
A circuit for providing a constant coloring current to a plurality of segment electrodes of an electrochromic display comprises a plurality of switching elements, say, transistors respectively connected to the segment electrodes for enabling the application of the constant coloring current to the segment electrodes, and an element for changing switching timings of the switching elements. A desirable amount of charge derived from the constant coloring current is applied to the segment electrodes regardless of the presence of the variations in electrical properties of the respective switching elements. In another form of the present invention, the changing element comprises a generator for generating a constant voltage, and a modifier for modifying a value of the constant voltage. In a further form of the present invention, the sizes of the respective switching elements, say, MOS transistors can be changed so that the factor W/L (W: the width of a channel of one of the MOS transistors, and L: the length of the channel) is selected so as to be proportional to the dimensions of the corresponding segment electrodes.

REFERENCES:
patent: 4153344 (1979-05-01), Hamada et al.
patent: 4160241 (1979-07-01), Shimizu et al.
patent: 4201984 (1980-05-01), Inami et al.
patent: 4201985 (1980-05-01), Inami et al.
patent: 4302751 (1981-11-01), Nakauchi et al.
Giglia, "Features of an Electrochromic Display Device," American Cyanamid Co. Research Div., 1976, 13 pages.

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