Patent ID: 9740006
Date: 2017-08-22
CPC Classifications: G02B

Claim:
1. An image display system, comprising: a freeform optical waveguide prism having a first major surface and a second major surface, the first major surface of the optical waveguide prism which in use is positioned to at least one of receive actively projected images into the optical waveguide prism from an active image source or emit the actively projected images out of the optical waveguide prism and the second major surface of the optical waveguide prism which in use is positioned to receive images of a real-world ambient environment into the optical waveguide prism, which real-world ambient environment is external to the image display system, at least some portions of the first and the second major surfaces of the optical waveguide prism being refractive surfaces that internally propagate light entering the optical waveguide prism along at least a portion of a length of the optical waveguide prism; a freeform compensation lens having a first major surface and a second major surface, the first major surface of the compensation lens having a shape that at least approximately matches a shape of the second major surface of the optical waveguide prism, the freeform compensation lens positioned relatively outwardly of the second major surface of the optical waveguide toward the real-world ambient environment to form a gap between the first major surface of the compensation lens and the second major surface of the optical waveguide prism; and at least one coupling lens located between an image display unit and the freeform optical waveguide prism, the at least one coupling lens to guide light from the image display unit into the optical waveguide prism and correct for optical aberrations, the at least one coupling lens comprising a liquid lens which is selectively adjustable to adjust a focal plane of the image display system.