Light source apparatus

Abstract

A light source apparatus permits an angular range of illumination light to be changed, wherein the apparatus can be made thin. A related display apparatus permits a visible angular range to be changed using the light source apparatus. The display apparatus can be mounted in a terminal device, and an optical member and an optical unit can be incorporated in the light source apparatus. The light source apparatus is provided with a light guide plate with a conical sheet. Two light sources are provided on side surfaces of the light guide plate. Two inclined surfaces whose inclination angles to a light output surface differ from each other are formed at a light diffusion surface of the light guide plate. The conical sheet is provided with a flat plate portion on which a plurality of cones are formed. The cones protrude toward the light guide plate.

1 . A light source apparatus, comprising:
 a first light source and a second light source;   a light guide member having a light diffusion surface, said light diffusion surface having plural diffusion features, each of said plural diffusion features having a first inclined surface inclined at a first angle relative to said light diffusion surface, a second inclined surface inclined at a second angle relative to said light diffusion surface, said second angle being greater than said first angle; and   an optical member which internally reflects light output from said light guide member in said first direction in a first angular range, and refracts light output from said light guide member in said second direction in a second angular range wider than said first angular range.