Method and means for stepwise charge control of electrochromic l

Details Method and means for stepwise charge control of electrochromic l Method and means for stepwise charge control of electrochromic l

1982-10-22

1985-04-23

Corbin, John K.

Communications: electrical

Land vehicle alarms or indicators

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

340785, G02F 123

Patent

active

045126372

ABSTRACT:
In order to control the absorptance of an electrochromic layer, the invention provides a plurality of steps for establishing different levels of coloring action. Quantities of charge are supplied to and removed from the layer, via one or the other of two constant-current sources, timed with clock pulses to a forward/backward counter. For decoloring processes, smaller quantities of charge are removed from the layer than are supplied to it during a corresponding coloring process. The quantities of charge removed for decoloring processes are, however, slightly greater than the quantities of removed charge needed to reach steps having exactly the same absorptance, so that even in the case of numerous changes between the color steps, destruction of the layer is definitely avoided. Preferred fields of use are lenses, particularly eyeglass lenses, filters and dimmable mirrors, each having an applied electrochromic layer whose absorptance is controlled for step-wise change.

REFERENCES:
patent: 4219809 (1980-08-01), Schwartzchild et al.
patent: 4228431 (1980-10-01), Barclay et al.
patent: 4262290 (1981-04-01), Vallins
patent: 4427979 (1984-01-01), Clerc et al.
J. Bruinink, "Electrochromic Display Devices", Sep. 1975, .sctn.3.4.

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