Electrochrome element driver

Details Electrochrome element driver Electrochrome element driver

2009-04-08

2010-10-19

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

C359S267000, C359S268000, C359S275000

Reexamination Certificate

active

07817326

ABSTRACT:
An electrochrome element driver supplies electrical power to an electrochrome element and includes an amplifying circuit, a variable resistor element, and a capacitor. The amplifying circuit has a control input for controlling a supply current flow to the electrochrome element, a feedback input, and an output. The variable resistor element has a first resistor terminal, a second resistor terminal coupled to the feedback input and a resistor control terminal for controlling a resistance of the variable resistor element. The resistor control terminal is coupled to the amplifying circuit output, the first resistor terminal is coupleable to a power source, and the second resistor terminal is coupleable to the electrochrome element such that a supply current path to the electrochrome element through the variable resistor element is formed. The capacitor is coupled to the resistor control terminal for effecting a stable behavior of the supply current flow to the electrochrome element.

REFERENCES:
patent: 4322133 (1982-03-01), Uede et al.
patent: 4528275 (1985-07-01), Hodge
patent: 5220317 (1993-06-01), Lynam et al.
patent: 5384578 (1995-01-01), Lynam et al.
patent: 5654736 (1997-08-01), Green et al.
patent: 6259426 (2001-07-01), Harada et al.
patent: 2007/0085803 (2007-04-01), Chu

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