A display device substrate comprising: a transparent substrate having a display portion formed in an overall rectangular shape in planar view; a low reflectance electrode provided in the display portion, having a plurality of pixel openings and a plurality of partial patterns parallel with respect to a first direction along the transparent substrate and being mutually and electrically isolated; a first transparent resin layer laminated on the low reflectance electrode; a transparent electrode laminated on the first transparent resin layer, having a plurality of partial patterns parallel with respect to a second direction perpendicular to the first direction and being along the transparent substrate; and a second transparent resin layer laminated on the partial patterns of the transparent electrode, wherein the low reflectance electrode comprises a metal film, the low reflectance electrode is constituted of a first light absorption resin layer containing a black colorant and the metal film having alkali tolerance which are laminated on the display portion in this order, the first light absorption resin layer and the metal film have a same shape in the planar view; characterized in that a metal that constitutes the metal film is a copper alloy, and an alloying element contained in the copper alloy is one or more metal elements selected from magnesium, calcium, titanium, molybdenum, indium, tin, zinc, aluminum, beryllium and nickel; an amount of the alloying element is such that an amount of the metal elements is 3 at % or less and 0.2 at % or more; the low reflectance electrode includes a second light absorption resin layer containing a black colorant that is further laminated on the metal film; and the second light absorption resin layer has the same shape as the first light absorption resin layer and the metal film in the planar view. a transparent substrate having a display portion formed in an overall rectangular shape in planar view; a low reflectance electrode provided in the display portion, having a plurality of pixel openings and a plurality of partial patterns parallel with respect to a first direction along the transparent substrate and being mutually and electrically isolated; a first transparent resin layer laminated on the low reflectance electrode; a transparent electrode laminated on the first transparent resin layer, having a plurality of partial patterns parallel with respect to a second direction perpendicular to the first direction and being along the transparent substrate; and a second transparent resin layer laminated on the partial patterns of the transparent electrode, wherein the low reflectance electrode comprises a metal film, the low reflectance electrode is constituted of a first light absorption resin layer containing a black colorant and the metal film having alkali tolerance which are laminated on the display portion in this order, the first light absorption resin layer and the metal film have a same shape in the planar view; characterized in that a metal that constitutes the metal film is a copper alloy, and an alloying element contained in the copper alloy is one or more metal elements selected from magnesium, calcium, titanium, molybdenum, indium, tin, zinc, aluminum, beryllium and nickel; an amount of the alloying element is such that an amount of the metal elements is 3 at % or less and 0.2 at % or more; the low reflectance electrode includes a second light absorption resin layer containing a black colorant that is further laminated on the metal film; and the second light absorption resin layer has the same shape as the first light absorption resin layer and the metal film in the planar view.