A stacked, integral, light-emitting multilayer structure (100, 200), comprising: a flexible substrate film layer of at least one film, 3D-shaped, preferably thermoformed, to define a number of recesses, the film layer hosting, in each of the formed recesses, a plurality of substantially aligned light sources disposed thereon, preferably LEDs, and configured to emit light; and a thermoplastic optically transmissive light-guiding material layer, characterised in that the structure comprises a substantially opaque cover member with a number of elongated indicator elements extending through the cover member, the cover member having an outer face towards the environment and opposite inner face towards the internals of the structure, each elongated indicator element having a periphery that defines a corresponding indicator shape, optionally substantially a stripe, in the cover member, said indicator element comprising at least optically translucent, optionally transparent, material to transmit light incident thereon and enable backlight arriving at the inner face to exit via the outer face, and that said number of recesses are elongated and substantially aligned with the number of indicator elements of the cover member, said plurality of light sources being spread along the length of the recess, optionally via integral or separate optics, substantially towards the cover member, and the light-guiding material layer being molded onto the film layer between the film layer and the cover layer so as to embed said plurality of light sources while defining a plurality of elongated protrusions aligned with the recesses and the indicator elements, each of said protrusions being configured to convey the light emitted by the underlying light sources of the corresponding recess of film layer towards the cover member, supporting total internal reflection based propagation of light therewithin enabled by an interface between the side walls of the protrusions and neighbouring material, which is air or other gaseous material. a flexible substrate film layer of at least one film, 3D-shaped, preferably thermoformed, to define a number of recesses, the film layer hosting, in each of the formed recesses, a plurality of substantially aligned light sources disposed thereon, preferably LEDs, and configured to emit light; and a thermoplastic optically transmissive light-guiding material layer, characterised in that the structure comprises a substantially opaque cover member with a number of elongated indicator elements extending through the cover member, the cover member having an outer face towards the environment and opposite inner face towards the internals of the structure, each elongated indicator element having a periphery that defines a corresponding indicator shape, optionally substantially a stripe, in the cover member, said indicator element comprising at least optically translucent, optionally transparent, material to transmit light incident thereon and enable backlight arriving at the inner face to exit via the outer face, and that said number of recesses are elongated and substantially aligned with the number of indicator elements of the cover member, said plurality of light sources being spread along the length of the recess, optionally via integral or separate optics, substantially towards the cover member, and the light-guiding material layer being molded onto the film layer between the film layer and the cover layer so as to embed said plurality of light sources while defining a plurality of elongated protrusions aligned with the recesses and the indicator elements, each of said protrusions being configured to convey the light emitted by the underlying light sources of the corresponding recess of film layer towards the cover member, supporting total internal reflection based propagation of light therewithin enabled by an interface between the side walls of the protrusions and neighbouring material, which is air or other gaseous material.