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We studied anti‐reflection conditions in plastic Organic Light Emitting Diodes (pOLED) display to obtain a uniform neutral black in all of viewing angles. Well‐known anti‐reflection design is consist of retardation (Rin) and wavelength dispersion of a quarter wave plate. However, we realized that a viewing angle anti‐reflection condition is determined by a total out plane retardation (Rth) of a polarizer...