Luminance is one of the key considerations for augmented reality (AR) and virtual reality (VR) displays as it affects image quality. We report on a probe design for measuring luminance of VR headsets. We compare the results with three commercially available luminance measurement systems. For performance characterization, we varied probe distance and the diameter of the dark spot at the center of a bright disk in our test patterns to minimize signal contamination from stray light and accurately measure low luminance values in the VR headsets.

Larger field of view, better image quality and higher efficiency in Augmented Reality (AR) glasses demands masters with large uniform diffraction gratings. Typically, a surface relief waveguide master is composed of input, output and deflection/expander gratings which all can either be slanted, blazed or binary gratings. Control of the angle of slanted and blazed gratings especially over large areas is an important parameter towards high quality large area gratings. Here we demonstrate large area diffraction gratings for AR applications where the angle uniformity is demonstrated to be +/- 1 degree across an 8-inch wafer. NIL technology has been pioneering the development of high quality large area slanted, binary and blazed grating masters and offers customizable solutions for all of the above-mentioned types of gratings and the gratings can be combined with 100% design freedom on the masters.