An electrochromic device (100, 200, 300, 400) comprising: a first substrate and a second substrate facing said first substrate,; a pixel including a first sub-pixel and a second sub-pixel, disposed side-by-side between the substrates in a plan view; wherein the first sub-pixel comprises a first electrolyte and a first electrochromic layer the first electrochromic layer, contacting the first electrolyte and including a first electrochromic material configured to display each one of transparency and at least two colors, based on a voltage applied to the first electrochromic material; and the second sub-pixel comprises a second electrolyte and a second electrochromic layer, the second electrochronic layer contacting the second electrolyte and including a second electrochromic material configured to display each one of transparency, black, and at least one color other than black, based on a voltage applied to the second electrochromic material, and the first electrochromic material and the second electrochromic material do not display the same color at the same voltage; the device further comprising either a single pair of electrodes corresponding to the first and second sub-pixels including a first electrode on the surface of the first substrate and a first further electrode on the surface of the second substrate, with the first electrochromic layer and the second electrochromic layer being disposed on a surface of the first further electrode, or alternatively, two pairs of electrodes consisting of a first pair of electrodes corresponding to the first sub-pixel and including a first electrode on a surface of the first substrate and a further electrode on a surface of the second substrate, and a second pair of electrodes corresponding to the second sub-pixel and including a second electrode on a surface of the first substrate and a second further electrode on a surface of the second substrate, with the first electrochromic layer being disposed on a surface of the first further electrode, and the second electrochromic layer layer being disposed on a surface of the second further electrode; the device further comprising a controller configured to apply voltages to the first sub-pixel and the second sub-pixel through the pair(s) of electrodes (12, 12a, 12b; 22, 22a, 22b). a first substrate and a second substrate facing said first substrate,; a pixel including a first sub-pixel and a second sub-pixel, disposed side-by-side between the substrates in a plan view; wherein the first sub-pixel comprises a first electrolyte and a first electrochromic layer the first electrochromic layer, contacting the first electrolyte and including a first electrochromic material configured to display each one of transparency and at least two colors, based on a voltage applied to the first electrochromic material; and the second sub-pixel comprises a second electrolyte and a second electrochromic layer, the second electrochronic layer contacting the second electrolyte and including a second electrochromic material configured to display each one of transparency, black, and at least one color other than black, based on a voltage applied to the second electrochromic material, and the first electrochromic material and the second electrochromic material do not display the same color at the same voltage; the device further comprising either a single pair of electrodes corresponding to the first and second sub-pixels including a first electrode on the surface of the first substrate and a first further electrode on the surface of the second substrate, with the first electrochromic layer and the second electrochromic layer being disposed on a surface of the first further electrode, or alternatively, two pairs of electrodes consisting of a first pair of electrodes corresponding to the first sub-pixel and including a first electrode on a surface of the first substrate and a further electrode on a surface of the second substrate, and a second pair of electrodes corresponding to the second sub-pixel and including a second electrode on a surface of the first substrate and a second further electrode on a surface of the second substrate, with the first electrochromic layer being disposed on a surface of the first further electrode, and the second electrochromic layer layer being disposed on a surface of the second further electrode; the device further comprising a controller configured to apply voltages to the first sub-pixel and the second sub-pixel through the pair(s) of electrodes (12, 12a, 12b; 22, 22a, 22b). a controller configured to apply voltages to the first sub-pixel and the second sub-pixel through the pair(s) of electrodes (12, 12a, 12b; 22, 22a, 22b).