A directly addressable display device comprising at least one pixel cell (2, 3), each pixel cell (2, 3) being separately and directly connectable to an external drive voltage source or an external addressing circuit for being directly addressed, each pixel cell (2, 3) being arranged for displaying a symbol, which symbol is repeatedly switchable between an on-state and an off-state, wherein each pixel cell (2, 3) comprises: - an electrically conducting electrochromic layer comprising an electrochromic organic polymer material being switchable between two different visually detectable colouring states respectively corresponding to said on-state and said off-state of said symbol; - a counter electrode countering a pixel electrode arranged in the same layer as the counter electrode, wherein said counter electrode, in the viewing direction of the display device, is arranged behind said electrochromic layer; - a solid electrolyte layer portion of a solid electrolyte arranged spatially between, and in ionic contact with, said electrochromic layer and said counter electrode; wherein - each pixel cell (2, 3) further comprises a symbol defining layer which is electronically and ionically insulating, arranged in direct physical contact with said electrochromic layer, and which symbol defining layer comprises one or more openings which defines or define the shape of said symbol; - said solid electrolyte layer portion being formed to fill and cover or more openings of the symbol defining layer, while also extending to the sides of the opening or openings, wherein said ionic contact extends throughout the openings of said symbol defining layer, and no solid electrolyte is in ionic contact with the electrochromic layer outside the openings of the symbol defining layer; - the solid electrolyte layer portion of a given pixel cell being not in direct contact with the solid electrolyte layer portion of another pixel cell, if present; and - said solid electrolyte comprises a polycationic electrolyte of cationic polymers, and the molecular weight distribution of the cationic polymers in the solid electrolyte is such that less than 20 wt% of the cationic polymers have a molecular weight lower than 1000 g/mol, that is more than 80 wt% of the cationic polymers have a molecular weight higher than 1000 g/mol. - an electrically conducting electrochromic layer comprising an electrochromic organic polymer material being switchable between two different visually detectable colouring states respectively corresponding to said on-state and said off-state of said symbol; - a counter electrode countering a pixel electrode arranged in the same layer as the counter electrode, wherein said counter electrode, in the viewing direction of the display device, is arranged behind said electrochromic layer; - a solid electrolyte layer portion of a solid electrolyte arranged spatially between, and in ionic contact with, said electrochromic layer and said counter electrode; wherein - each pixel cell (2, 3) further comprises a symbol defining layer which is electronically and ionically insulating, arranged in direct physical contact with said electrochromic layer, and which symbol defining layer comprises one or more openings which defines or define the shape of said symbol; - said solid electrolyte layer portion being formed to fill and cover or more openings of the symbol defining layer, while also extending to the sides of the opening or openings, wherein said ionic contact extends throughout the openings of said symbol defining layer, and no solid electrolyte is in ionic contact with the electrochromic layer outside the openings of the symbol defining layer; - the solid electrolyte layer portion of a given pixel cell being not in direct contact with the solid electrolyte layer portion of another pixel cell, if present; and - said solid electrolyte comprises a polycationic electrolyte of cationic polymers, and the molecular weight distribution of the cationic polymers in the solid electrolyte is such that less than 20 wt% of the cationic polymers have a molecular weight lower than 1000 g/mol, that is more than 80 wt% of the cationic polymers have a molecular weight higher than 1000 g/mol.