| 摘要 |
An electrochromic display device comprises a pair of oppositely disposed electrode plates at one of which is transparent, and an electrochromic composition of a compound whose formula is either I or II. The solubility of the electrochromic compound to the solvent is 10-2mol(100 g solvent) or more in a reduced state and 10-1mol(100 g solvent) or more in an oxidized state. In formula I and II, R1 and R2 are one of methyl, ehthyl and propyl and X is one of fluoro, chloro, bromo, iodo.
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