Patent ID: 9709721
Date: 2017-07-18
CPC Classifications: G02B,Y10T

Claim:
1. A light guide device comprising one or more light sources coupled to a light guide plate, wherein said light guide plate comprises: a first layer of light guiding material, a second layer of light guiding material which is mounted upon a surface of the first layer of light guiding material, and one or more light scattering features embedded within at least one of the first and second layers of light guiding material and located at the interface between the first and second layers of light guiding material, wherein light from the one or more light sources is guided within both the first layer of light guiding material and the second layer of light guiding material by total internal reflection, wherein said one or more light scattering features disturb the total internal reflection of the guided light and the disturbed light is emitted in a direction which is perpendicular or substantially perpendicular to the direction of the guided light, and wherein the one or more scattering features are dispersed within a transparent ink.