Planar light guide has broad sides formed such that straight line perpendicular to light propagating in light conductor experiences change in direction pointing to center of curvature when impinging on one of sides

摘要

The guide (10) has broad sides (12,14) lying respectively between outer edge and center of curvature. The thickness of material increases between broad sides along between broad sides and terminating in center of curvature of straight line (15). A direction component is formed at intersection of straight line and normal vector (17,19) of broad sides, which points toward increase of thickness of light guide, so that straight line perpendicular to light propagating in light conductor experiences change in direction pointing to center of curvature when impinging on one of sides.