Patent ID: 8349225
Filing Date: 2013-01-08
Classification: G02B

Abstract:
1. A method for manufacturing a light guide plate, the method comprising: providing an injection mold comprising a cavity plate; forming a plurality of microstructures on the cavity plate by laser etching, each microstructure defining a substantially spherical recess having a concave surface, and a substantially ring-shaped protrusion formed around a periphery of the spherical recess, wherein at least half of the concave surface is a mirror-like surface; and molding a light guide plate in the injection mold, wherein the light guide plate comprises a light input surface, a light output surface adjoining the light input surface, and a reflecting surface opposite the light output surface; at least one of the light output surface and the reflecting surface forms a plurality of substantially spherical protrusions corresponding to the plurality of substantially spherical recesses of the cavity plate, and a plurality of substantially ring-shaped grooves corresponding to the plurality of substantially ring-shaped protrusions of the cavity plate; each of the plurality of ring-shaped grooves is defined around a periphery of corresponding one of the plurality of spherical protrusions, and at least half of an outer surface of the plurality of spherical protrusions is a mirror-like surface.