Patent ID: 8915634

Claim:
A plane light source comprising: a circuit substrate; a plurality of sets of side-view light-emitting devices arranged in array over the circuit substrate and electrically connected with the circuit substrate; and a diffusive light-guiding layer covering the circuit substrate and the side-view light-emitting devices, wherein the diffusive light-guiding layer is divided into a plurality of diffusive light-guiding units arranged in array and connected to each other, each of the diffusive light-guiding units is respectively corresponded to illumination coverage of one set of side-view light-emitting devices, each set of side-view light-emitting devices at least comprises two side-view light-emitting devices, wherein light emitted from the two side-view light-emitting devices in each set of side-view light-emitting devices respectively propagates along two different directions into each of the corresponding diffusive light-guiding units, and each of the two side-view light-emitting devices is respectively emitting the light towards one single diffusive light-guiding unit, wherein each diffusive light-guiding unit comprises a plurality of diffusive micro-structures, and the height and width of each successive diffusive micro-structure of the plurality of diffusive micro-structures gradually decrease from the center of the diffusive light-guiding unit towards the side-view light-emitting devices.