US Patent 11385399 Integrated optically functional multilayer structure and related method of manufacture

An integrated functional multilayer structure includes substrate film, circuitry provided upon the substrate film including a first light source and a monolithic lightguide layer, the lightguide layer includes a first surface and an opposite second surface, the second surface facing the first light source and a portion of the first surface containing, a pre-defined outcoupling area for the light emitted by the first light source and transmitted within the lightguide layer, the lightguide layer further containing a light leakage prohibition region and the attenuation of emitted light effectuated on a direct optical path between the first light source and the outcoupling area is less than the attenuation effectuating on a optical path between the first light source and the light leakage prohibition region. A related method of manufacture is also presented.