Patent Document ID: 9720548
Application ID: 14316802
Patent Status: 1

Claim One:
1. A method comprising: providing IR light from a source to an illumination unit, the illumination unit comprising a partially reflective layer with extraction features including a partially reflective bumpy surface, wherein the partially reflective bumpy surface is blanket coated; providing uniform output extraction versus position across the partially reflective layer by controlling a level of partial reflectivity of embedded extraction features; directing the IR light in a direction selected from a list consisting of the following a divergent direction from a display, and a direction having a constant angular bias versus position across the display such that a floating image of IR illumination is supported on the display in a retro-imaging application; and achieving an angular bias across position by changing a tilt angle of the embedded extraction features versus position such that the IR light is extracted as one of: telecentric, left or right angularly biased, in or out angularly biased in a dimension orthogonal to a propagation dimension along the partially reflective layer.