Patent ID: 9164223
Filing Date: 2015-10-20
Classification: G02B

Abstract:
1. A light guide device comprising: a base substrate having a first refractive index, one or more light sources mounted upon a first surface of the base substrate, and a first guide layer having a second refractive index that is less than or equal to the first refractive index and which comprises a light output surface, the first guide layer being arranged so as to encapsulate the one or more light sources upon the first surface, wherein the light sources provide an output and there is no air gap between the output of the one or more light sources and the first guide layer, and wherein the base substrate and the guide layer form a composite structure for guiding light produced by the one or more light sources over the first surface and said one or more light sources are positioned directly behind the light output surface and direct light parallel to the plane of the base substrate; wherein the one or more light sources are present in a direct lit arrangement in a two dimensional array forming a plurality of rows and columns of light sources, and wherein in a given row or column for two adjacent light sources the angle between the direction of light generated by the first light source in a first direction which is substantially parallel to the plane of the base substrate and the direction of light generated by the second light source in a second direction which is also substantially parallel to the plane of the base substrate is about 180°.