Patent ID: 7303322
Filing Date: 2007-12-04
Classification: G02B

Abstract:
1. A backlighting system, comprising: a first lightguide having an interior; at least one light source optically connected to an edge of the first lightguide for supplying light into the interior thereof; a first recycling enhancement structure disposed at and attached to a surface of the first lightguide; a second lightguide having an interior; a second recycling enhancement structure disposed between the first lightguide and the second lightguide; at least one light source optically connected to an edge of the second lightguide for supplying light into the interior thereof; and an extractor disposed at a surface of the second lightguide for diffuse extraction of light from the interior of the second lightguide; wherein at least a portion of the light supplied into the interior of the second lightguide and then diffusely extracted therefrom enters the interior of the first lightguide through a substantially optically clear surface.