Electrically controllable device having a controlled thickness of an electroactive medium and that is of simplified manufacture and manufacturing process thereof

An electrically controllable device having variable optical/energy properties, comprising a stack of layers comprising:

• (A) a substrate having a glass function;
• (B) a first electronically conductive layer with an associated current feed;
• (C) a layer of electroactive varnish comprising at least one binder polymer comprising constituents of an electroactive medium comprising:
• at least one electroactive organic compound, ea1+, capable of at least one of being reduced and accepting electrons and cations acting as compensation charges;
• at least one electroactive organic compound, ea2, capable of at least one of being oxidized and ejecting electrons and cations acting as compensation charges;
• wherein at least one of the electroactive organic compounds, ea1+ and ea2, is electrochromic in order to obtain a color contrast;
• and
• ionic charges capable of allowing, under an electric current, oxidation and reduction reactions of the electroactive organic compounds, ea1+ & ea2, necessary to obtain the color contrast, and
• (D) a second electronically conductive layer with an associated current feed.