Shaping input surfaces of led light-guides for increased light extraction efficiency

A method comprising:

• determining an angular distribution of light of a light emitting element;
• determining a shape of an injection surface of a light guide plate (LGP) based on the determined angular distribution, the shaped injection surface extending between a first surface and a second surface, the second surface opposite the first surface, the LGP including light extraction features on the first surface, a third surface of the LGP opposite the shaped injection surface, and the second surface connecting the shaped injection surface and the third surface;
• and
• applying the shape to the injection surface, such that the shape of the injection surface is substantially perpendicular to the first surface, the shaped injection surface shaped to deviate light about parallel to the first surface and incident on the shaped injection surface towards the first surface and the second surface.

A light guide plate (LGP) system comprising:

• a light-emitting element;
• a shaped injection surface;
• a first surface;
• a second surface opposite the first surface;
• a third surface opposite the shaped injection surface;
• light extraction features selected from one of a texture and a dot pattern and located on the first surface;
• and
• the shaped injection surface extending between the first surface and the second surface and shaped to deviate light about parallel to the first surface from the light emitting element towards the first surface and the second surface.