US Patent 10247946 Dynamic lens for head mounted display

A Head Mounted Display (“HMD”) includes a display module to generate image light, an optical combiner, a stacked switchable lens, and control circuitry. The optical combiner combines the image light with external scene light. The optical combiner includes a reflective element coupled to receive the image light and direct the image light in an eye-ward direction. The stacked switchable lens is optically coupled to receive the image light. The stacked switchable lens includes at least a first switching optic and a second switching optic. The control circuitry is configured to selectively activate the first switching optic and the second switching optic. The first switching optic is configured to direct the image light toward a first eyeward region when activated by the control circuitry. The second switching optic is configured to direct the image light toward a second eyeward region when activated by the control circuitry.