Patent ID: 8998477
Filing Date: 2015-04-07
Classification: G02B,G03B

Abstract:
1. An apparatus comprising: a first sheet including a distribution of light diffusing particles; and a light source placed along an edge of the first sheet; wherein, the first sheet diffuses light generated by the light source such that the light emanates from a surface of the first sheet, there is a continuous gradation in the concentration of light diffusing particles, the first sheet and the light source together provide a light emanating surface that allows light sent into a large face of the first sheet to almost completely pass through without being dispersed, the concentration of light diffusing particles is so small that if the first sheet is viewed along its narrow dimension, it seems almost completely transparent, while when viewed along its longer dimension, a much larger visual concentration of the light diffusing particles is observed, and the concentration of light diffusing particles at each location is varied in inverse proportion to the difference between a constant and the distance of the location from an edge of the first sheet.