Abstract: An optical structure is provided. The optical structure includes a substrate and a light-emitting element disposed on the substrate. The optical structure also includes a cap disposed on the substrate and covering the light-emitting element. The cap has a top portion and a sidewall connected to the top portion. The optical structure further includes a first micro-structure disposed on a first side of the top portion facing the light-emitting element. The first micro-structure is periodically arranged.

Abstract: A light emitting module is provided. The light emitting module includes a substrate, light emitting elements, an encapsulant material and dimming structures. The light emitting elements are disposed over the substrate. The encapsulant material covers the light emitting elements and the substrate, and the encapsulant material has an encapsulant height H. The dimming structures are disposed over the encapsulant material or embedded in the encapsulant material. The dimming structures have a maximum dimming thickness h. The encapsulant thickness H and the maximum dimming thickness h satisfy the following relationship: 0.01?h/H?1.

Abstract: A light beam controlling member covers an optical device, and the optical device emits light. The light beam controlling member has a body. The body has an optical axis, and the body has a bottom surface, a light-entering surface, and a light-exiting surface. The bottom surface is connected to the light-entering surface and the light-exiting surface. The light-exiting surface is located on an outer side of the body, and the light-entering surface is located on an inner side of the body. The light-entering surface defines a cavity, and the cavity accommodates the optical device. The light-entering surface is divided into a first light-entering region and a second light-entering region. The first light-entering region is a concave surface. The second light-entering region is connected to the first light-entering region and the bottom surface, and the second light-entering region is an inwardly inclined surface.