Exit pupil expander with a large field of view based on diffractive optics

The field of view is an important parameter of a near-to-eye display. To achieve an immersive viewing experience, the field of view should be as high as possible. Presently, in most of the commercially available devices the field of view is between 15 degrees and degrees 30. In this paper, a large-field-of-view exit pupil expander that is based on diffractive optics was demonstrated. Usually these types of diffractive expanders cannot have a field of view much more than 25 degrees. Here, an exit pupil expander with an extended field of view, based on two stacked plates, was demonstrated. The expander is designed for green light and it achieves a field of view of more than 40 degrees.