Transparent substrate for area light emitting device, a method for producing transparent substrate, and area light emitting device and liquid crystal display device

摘要

A transparent substrate (2) used for an area light emitting device (1). The transparent substrate (2) comprises a light incidence surface (21) and a light exit surface (22) opposite to the light incidence surface. A plurality of recesses (23) are formed on the light exit surface (22) bulged towards the light incidence surface. Each recess has a shape approximately corresponding to a portion of an oval sphere. Each recess perimeter on the light exit surface is approximately oval. Each recess is separately formed from other recesses.