Patent ID: 9057826
Filing Date: 2015-06-16
Classification: G02B,G02C

Abstract:
1. An optical apparatus for a head mounted display, comprising: an image source coupled to emit image light; an optical combiner having an eye-ward side and an external scene side and including a partially reflective diffraction grating that is at least partially reflective to the image light incident through the eye-ward side of the optical combiner and at least partially transmissive to external scene light incident through the external scene side of the optical combiner; an image lens disposed in an optical path of the image light between the image source and the eye-ward side of the optical combiner to apply a first corrective prescription to the image light emitted from the image source; and an external scene lens disposed over the external scene side of the optical combiner to apply a second corrective prescription to the external scene light that passes through the optical combiner, wherein the optical combiner combines the image light with the scene light to form a combined image that is corrected according to the first and second corrective prescriptions and propagates along a common viewing path extending along an eye-ward direction from the eye-ward side.