Patent ID: 7733439
Filing Date: 2010-06-08
Classification: G02B

Abstract:
1. A light guide comprising: a cover layer having a planar surface; a film having first and second surfaces, said first surface comprising a plurality of concave surface relief features and said second surface being planar; and a light guide plate having top and bottom planar surfaces, said light guide plate being thicker than said cover layer; wherein said film is disposed between said cover layer and said light guide plate, wherein said film is disposed on said light guide plate such that said planar second surface is adjacent said light guide plate and said concave surface relief features of said first surface face away from said light guide plate; and wherein said cover layer is disposed adjacent said film such that the planar surface of said cover layer and the concave surface features of said film form cavities between said cover layer and said film such that light guided within the cover layer, light guide plate, and film is totally internally reflected from the cavities such that the light is no longer guided in the cover layer, light guide plate, or film.