a display device comprising : a light switching unit comprising an array of pixels each operable to vary the transmission of light therethrough ; and a backlight comprising a first series of regions of organic light - emissive material having a first emission color and a second series of regions of organic light - emissive material having a second emission color , each region of organic material being located so as to lie behind a plurality of pixels of the array in the viewing direction for backlighting those pixels ; and at least one of the regions of organic light - emissive material being formed by a process of ink - jet deposition .