Electrochromic element
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United States of America Patent
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Dec 11, 2018
Grant Date -
Jan 11, 2018
app pub date -
Mar 30, 2016
filing date -
Apr 14, 2015
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Abstract
An electrochromic element, includes: a pair of electrodes (3, 5); and an electrochromic layer (7) disposed between the pair of electrodes (3, 5), the electrochromic element being controlled in transmittance by pulse width modulation, in which: the electrochromic layer (7) contains at least one of two or more kinds of anode electrochromic materials, or two or more kinds of cathode electrochromic materials; and all of one of the anode electrochromic materials and the cathode electrochromic materials have an equal molecular length, or have a molecular length ratio of (large molecular length)/(small molecular length) of 1.4 or less, the electrochromic element being such that even when a driving environment temperature changes, its gradation can be controlled under a state in which its absorption spectrum is retained.
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