Controlled viewing angle display apparatus

A light source apparatus, comprising:

• a light guide member having a flat light output surface and a light diffusion surface opposite said light output surface,
• said light diffusion surface having plural inclined surfaces inclined relative to said light diffusion surface, said inclined surfaces being arrayed in rows that are parallel to a first side surface of said light guide member;
• a first light source on said first side surface of said light guide member and second light source on a second side surface of said light guide member opposite said first side surface, wherein light in said light guide member from said first light source internally reflects off said light diffusion surface toward said light output surface and wherein light in said light guide member from said second light source internally reflects off said inclined surfaces toward said light output surface;
• and
• an optical member adjacent and parallel to said light output surface, said optical member including a flat plate and a plurality of protruding portions with hemispherical ends directly contacting said light output surface of said light guide member, said protruding portions internally reflecting, toward said flat plate, light received from said first light source and refracting light received from said inclined surfaces,
• wherein said inclined surfaces and said protruding portions are arranged so that said flat plate outputs light originating from said first light source in a first angular range and outputs light originating from said second light source in a second angular range that is wider than said first angular range.

A light source apparatus, comprising:

• a light guide member having a flat light output surface and a flat light diffusion surface opposite said light output surface;
• a first light source on a first side surface of said light guide member and second light source on a second side surface of said light guide member opposite said first side surface, wherein light in said light guide member from said first and second light sources internally reflects off said light diffusion surface toward said light output surface;
• and
• an optical member adjacent and parallel to said light output surface, said optical member including a flat plate and an array of protruding portions with rounded ends directly contacting said light output surface of said light guide member,
• each of said protruding portions having a first reflective area that faces said first side surface and that has a concavity therein that internally reflects, toward said flat plate, light received from said second light source, and a second reflective area that faces said second side surface and that is convex and that internally reflects, toward said flat plate, light received from said first light source,
• wherein said first and second reflective areas are arranged so that said flat plate outputs light originating from said first light source in a first angular range and outputs light originating from said second light source in a second angular range that is wider than said first angular range.

A light source apparatus, comprising:

• a light guide member having a flat light output surface and a flat light diffusion surface opposite said light output surface;
• a first light source on a first side surface of said light guide member and second light source on a second side surface of said light guide member opposite said first side surface, wherein light in said light guide member from said first and second light sources internally reflects off said light diffusion surface toward said light output surface;
• and
• an optical member adjacent and parallel to said light output surface, said optical member including a flat plate and an array of protruding portions with rounded ends directly contacting said light output surface of said light guide member,
• each of said protruding portions having a convex roughened diffusion area that faces said first side surface and that internally reflects, toward said flat plate, light received from said second light source, and a convex reflective area that faces said second side surface and that internally reflects, toward said flat plate, light received from said first light source, wherein said roughened diffusion areas and said reflective areas are arranged so that said flat plate outputs light originating from said first light source in a first angular range and outputs light originating from said second light source in a second angular range that is wider than said first angular range.