The invention relates to an apparatus comprising a display apparatus, an image forming apparatus, light beam and optics modules. The light beam is arranged from a light source to the image forming apparatus and generates image at position different from the display apparatus. The optics modules are arranged to guide the light beam such that at least port of the light beam also provides a backlight light source of the display apparatus. In addition, the invention relates to a method for using an electronic apparatus, wherein the electronic apparatus comprises a display apparatus and light beam, light beam, and light beam is arranged from a light source to the image forming apparatus and generates image at position different from the display apparatus, the using method comprises guiding at least a part of the light beam to the display apparatus to provide backlight light source of the display apparatus. The inventive apparatus and using method illuminate the image display with image projection generated by the light source, and the light beam for image projection from the light source is partially or completely coupled to a backlight unit via an optical coupling apparatus.