Patent ID: 8721101

Claim:
Light emitting device comprising a plurality of light sources mounted on a substrate, a light guide plate substantially parallel to the substrate, and side walls provided along outer edges of the light guide plate and along outer edges of the substrate connecting the outer edges of the light guide plate to the outer edges of the substrate so as to form a cavity bounded by the substrate, light guide plate and side walls, wherein said light guide plate has a light exit surface and an opposed light entrance surface facing said plurality of light sources, wherein said light entrance surface is arranged for in-coupling of light emitted by the light sources into the light guide plate, wherein at least part of the in-coupled light is transmitted within the light guide plate by total internal reflection so that light from different light sources is mixed within the light guide plate and wherein at least part of said light exit surface is provided with an optical structure for out-coupling of light and wherein the light emitting device further comprises reflective shielding provided at positions where the flux of the direct light of the light sources towards the light guide plate have their maximum density in a powered state of the light sources.