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Electrochromic
glass
An electrochromic car roof maximizes the light and comfort inside
vehicles in summer and in winter, whatever the sunlight factor,
by modulating the transmission of light.
The electrochromic roof is made of laminated glass which also gives
it a shatter-proof quality. The inner surface of one of the glass
sheets is multi-coated with an electrochromic film, around one micron
thick. The stacked electrochromic layers act like a battery, the
electrodes and electrolyte of which constitute thin layers of transparent
minerals whose color changes with the charge. The application of
a voltage colors the glass. The glass only needs to be short-circuited
or a reverse polarity voltage applied to render it colorless. In
the absence of any voltage, the glass has a memory effect and retains
its previous coloration. This means that the glass draws current
only during the coloring and clearing phases.
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