An electronic apparatus comprising an electro-luminescent display device, an information display window defined on an outward facing surface of the display device to form a data display portion having a characteristic pixel density, a digital assembly to output data to the display device for display on the information display window, a viewing window through which information displayed on the information display window is viewable from outside of the apparatus, and a translucent plastic light filter disposed between the viewing window and the information display window; wherein the translucent plastic filter has a transmittance which is adapted to visually conceal the information display window or make the underlying information display window not visible when under sunlit ambient illuminations.