Electrochromic system and method for controlling photochromic darkening
First Claim
Patent Images
1. An electrochromic (EC) system, comprising:
- an EC device comprising;
a working electrode;
a counter electrode;
a solid state electrolyte layer disposed between the counter and working electrodes; and
a control unit configured to selectively apply a sweep voltage between the working and counter electrodes, such that the sweep voltage is applied when an open circuit voltage (OCV) between the working and counter electrodes is less than a threshold voltage.
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Abstract
An electrochromic system and method for controlling photochromic darkening of an electrochromic device, the system including an EC device, a control unit, a voltage detector, and a power supply. The EC device includes a working electrode, a counter electrode, and a solid-state polymer electrolyte disposed therebetween. The control unit is configured to control a sweep voltage applied between the working and counter electrodes, such that the sweep voltage is applied when an open circuit voltage (OCV) between the working and counter electrodes is less than a threshold voltage.
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Citations
24 Claims
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1. An electrochromic (EC) system, comprising:
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an EC device comprising; a working electrode; a counter electrode; a solid state electrolyte layer disposed between the counter and working electrodes; and a control unit configured to selectively apply a sweep voltage between the working and counter electrodes, such that the sweep voltage is applied when an open circuit voltage (OCV) between the working and counter electrodes is less than a threshold voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of controlling photochromic darkening of an EC device comprising a working electrode, a counter electrode, and a solid-state electrolyte disposed between the working and counter electrodes, the method comprising:
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detecting an open circuit voltage (OCV) between the working and counter electrodes of the EC device; and applying a sweep voltage between the working and counter electrodes, when the OCV is more negative than a threshold voltage. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of controlling photochromic darkening of an EC device comprising a working electrode, a counter electrode, and a solid-state electrolyte disposed between the working and counter electrodes, the method comprising:
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determining an amount of time since a voltage was applied to the EC device to change the transmissivity thereof; and applying a sweep voltage to the EC device, if determined amount of time exceeds a threshold time period. - View Dependent Claims (18, 19, 20)
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21. A method of controlling photochromic darkening of an EC device comprising a working electrode, a counter electrode, and a solid-state electrolyte disposed between the working and counter electrodes, the method comprising:
periodically applying a sweep voltage between the working and counter electrodes, such that an open circuit voltage between the working and counter electrodes is changed from a negative voltage to a positive voltage. - View Dependent Claims (22, 23, 24)
Specification