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US 4,059,341 AGranted
Electrochromic display device with electrolytes and a method of producing the same
AssigneeBBC Brown, Boveri & Company, Limited
InventorHans-Rudolf Zeller
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Abstract
An improved electrochromic display device and a method of making it are disclosed. The display device includes a proton free substance used as the electrolyte which increases the lifetime of the display, even at high switching voltages. The disclosed method includes the initial dehydration of the electrolyte material and the subsequent addition of a drying agent to it.
Claims9
In an electrochromic display device having an electrochromic layer present in its solid form upon a first electrode and in contact with a water-free electrolyte contacting a second electrode, the the improvement comprising:
- a proton-free substance as said electrolyte and an operating voltage between said two electrodes exceeding two volts.
Dependencies are inferred from the claim text.